From f85e0d461fe80fe929eb5d82d9fec07eff810a93 Mon Sep 17 00:00:00 2001 From: Dimitri Sokolyuk Date: Sun, 16 Jul 2017 22:38:45 +0200 Subject: Add vendor --- vendor/golang.org/x/crypto/.gitattributes | 10 + vendor/golang.org/x/crypto/.gitignore | 2 + vendor/golang.org/x/crypto/AUTHORS | 3 + vendor/golang.org/x/crypto/CONTRIBUTING.md | 31 + vendor/golang.org/x/crypto/CONTRIBUTORS | 3 + vendor/golang.org/x/crypto/LICENSE | 27 + vendor/golang.org/x/crypto/PATENTS | 22 + vendor/golang.org/x/crypto/README | 3 + vendor/golang.org/x/crypto/blowfish/block.go | 159 ++ .../golang.org/x/crypto/blowfish/blowfish_test.go | 274 +++ vendor/golang.org/x/crypto/blowfish/cipher.go | 91 + vendor/golang.org/x/crypto/blowfish/const.go | 199 +++ vendor/golang.org/x/crypto/codereview.cfg | 1 + vendor/golang.org/x/crypto/ed25519/ed25519.go | 181 ++ vendor/golang.org/x/crypto/ed25519/ed25519_test.go | 183 ++ .../crypto/ed25519/internal/edwards25519/const.go | 1422 ++++++++++++++++ .../ed25519/internal/edwards25519/edwards25519.go | 1771 ++++++++++++++++++++ vendor/golang.org/x/crypto/ssh/benchmark_test.go | 122 ++ vendor/golang.org/x/crypto/ssh/buffer.go | 98 ++ vendor/golang.org/x/crypto/ssh/buffer_test.go | 87 + vendor/golang.org/x/crypto/ssh/certs.go | 519 ++++++ vendor/golang.org/x/crypto/ssh/certs_test.go | 222 +++ vendor/golang.org/x/crypto/ssh/channel.go | 633 +++++++ vendor/golang.org/x/crypto/ssh/cipher.go | 629 +++++++ vendor/golang.org/x/crypto/ssh/cipher_test.go | 129 ++ vendor/golang.org/x/crypto/ssh/client.go | 257 +++ vendor/golang.org/x/crypto/ssh/client_auth.go | 486 ++++++ vendor/golang.org/x/crypto/ssh/client_auth_test.go | 628 +++++++ vendor/golang.org/x/crypto/ssh/client_test.go | 81 + vendor/golang.org/x/crypto/ssh/common.go | 373 +++++ vendor/golang.org/x/crypto/ssh/connection.go | 143 ++ vendor/golang.org/x/crypto/ssh/doc.go | 21 + vendor/golang.org/x/crypto/ssh/example_test.go | 320 ++++ vendor/golang.org/x/crypto/ssh/handshake.go | 640 +++++++ vendor/golang.org/x/crypto/ssh/handshake_test.go | 559 ++++++ vendor/golang.org/x/crypto/ssh/kex.go | 540 ++++++ vendor/golang.org/x/crypto/ssh/kex_test.go | 50 + vendor/golang.org/x/crypto/ssh/keys.go | 1006 +++++++++++ vendor/golang.org/x/crypto/ssh/keys_test.go | 500 ++++++ vendor/golang.org/x/crypto/ssh/mac.go | 61 + vendor/golang.org/x/crypto/ssh/mempipe_test.go | 110 ++ vendor/golang.org/x/crypto/ssh/messages.go | 758 +++++++++ vendor/golang.org/x/crypto/ssh/messages_test.go | 288 ++++ vendor/golang.org/x/crypto/ssh/mux.go | 330 ++++ vendor/golang.org/x/crypto/ssh/mux_test.go | 505 ++++++ vendor/golang.org/x/crypto/ssh/server.go | 563 +++++++ vendor/golang.org/x/crypto/ssh/session.go | 627 +++++++ vendor/golang.org/x/crypto/ssh/session_test.go | 774 +++++++++ vendor/golang.org/x/crypto/ssh/streamlocal.go | 115 ++ vendor/golang.org/x/crypto/ssh/tcpip.go | 465 +++++ vendor/golang.org/x/crypto/ssh/tcpip_test.go | 20 + .../golang.org/x/crypto/ssh/terminal/terminal.go | 951 +++++++++++ .../x/crypto/ssh/terminal/terminal_test.go | 350 ++++ vendor/golang.org/x/crypto/ssh/terminal/util.go | 119 ++ .../golang.org/x/crypto/ssh/terminal/util_bsd.go | 12 + .../golang.org/x/crypto/ssh/terminal/util_linux.go | 11 + .../golang.org/x/crypto/ssh/terminal/util_plan9.go | 58 + .../x/crypto/ssh/terminal/util_solaris.go | 128 ++ .../x/crypto/ssh/terminal/util_windows.go | 155 ++ vendor/golang.org/x/crypto/ssh/testdata_test.go | 63 + vendor/golang.org/x/crypto/ssh/transport.go | 375 +++++ vendor/golang.org/x/crypto/ssh/transport_test.go | 109 ++ 62 files changed, 19372 insertions(+) create mode 100644 vendor/golang.org/x/crypto/.gitattributes create mode 100644 vendor/golang.org/x/crypto/.gitignore create mode 100644 vendor/golang.org/x/crypto/AUTHORS create mode 100644 vendor/golang.org/x/crypto/CONTRIBUTING.md create mode 100644 vendor/golang.org/x/crypto/CONTRIBUTORS create mode 100644 vendor/golang.org/x/crypto/LICENSE create mode 100644 vendor/golang.org/x/crypto/PATENTS create mode 100644 vendor/golang.org/x/crypto/README create mode 100644 vendor/golang.org/x/crypto/blowfish/block.go create mode 100644 vendor/golang.org/x/crypto/blowfish/blowfish_test.go create mode 100644 vendor/golang.org/x/crypto/blowfish/cipher.go create mode 100644 vendor/golang.org/x/crypto/blowfish/const.go create mode 100644 vendor/golang.org/x/crypto/codereview.cfg create mode 100644 vendor/golang.org/x/crypto/ed25519/ed25519.go create mode 100644 vendor/golang.org/x/crypto/ed25519/ed25519_test.go create mode 100644 vendor/golang.org/x/crypto/ed25519/internal/edwards25519/const.go create mode 100644 vendor/golang.org/x/crypto/ed25519/internal/edwards25519/edwards25519.go create mode 100644 vendor/golang.org/x/crypto/ssh/benchmark_test.go create mode 100644 vendor/golang.org/x/crypto/ssh/buffer.go create mode 100644 vendor/golang.org/x/crypto/ssh/buffer_test.go create mode 100644 vendor/golang.org/x/crypto/ssh/certs.go create mode 100644 vendor/golang.org/x/crypto/ssh/certs_test.go create mode 100644 vendor/golang.org/x/crypto/ssh/channel.go create mode 100644 vendor/golang.org/x/crypto/ssh/cipher.go create mode 100644 vendor/golang.org/x/crypto/ssh/cipher_test.go create mode 100644 vendor/golang.org/x/crypto/ssh/client.go create mode 100644 vendor/golang.org/x/crypto/ssh/client_auth.go create mode 100644 vendor/golang.org/x/crypto/ssh/client_auth_test.go create mode 100644 vendor/golang.org/x/crypto/ssh/client_test.go create mode 100644 vendor/golang.org/x/crypto/ssh/common.go create mode 100644 vendor/golang.org/x/crypto/ssh/connection.go create mode 100644 vendor/golang.org/x/crypto/ssh/doc.go create mode 100644 vendor/golang.org/x/crypto/ssh/example_test.go create mode 100644 vendor/golang.org/x/crypto/ssh/handshake.go create mode 100644 vendor/golang.org/x/crypto/ssh/handshake_test.go create mode 100644 vendor/golang.org/x/crypto/ssh/kex.go create mode 100644 vendor/golang.org/x/crypto/ssh/kex_test.go create mode 100644 vendor/golang.org/x/crypto/ssh/keys.go create mode 100644 vendor/golang.org/x/crypto/ssh/keys_test.go create mode 100644 vendor/golang.org/x/crypto/ssh/mac.go create mode 100644 vendor/golang.org/x/crypto/ssh/mempipe_test.go create mode 100644 vendor/golang.org/x/crypto/ssh/messages.go create mode 100644 vendor/golang.org/x/crypto/ssh/messages_test.go create mode 100644 vendor/golang.org/x/crypto/ssh/mux.go create mode 100644 vendor/golang.org/x/crypto/ssh/mux_test.go create mode 100644 vendor/golang.org/x/crypto/ssh/server.go create mode 100644 vendor/golang.org/x/crypto/ssh/session.go create mode 100644 vendor/golang.org/x/crypto/ssh/session_test.go create mode 100644 vendor/golang.org/x/crypto/ssh/streamlocal.go create mode 100644 vendor/golang.org/x/crypto/ssh/tcpip.go create mode 100644 vendor/golang.org/x/crypto/ssh/tcpip_test.go create mode 100644 vendor/golang.org/x/crypto/ssh/terminal/terminal.go create mode 100644 vendor/golang.org/x/crypto/ssh/terminal/terminal_test.go create mode 100644 vendor/golang.org/x/crypto/ssh/terminal/util.go create mode 100644 vendor/golang.org/x/crypto/ssh/terminal/util_bsd.go create mode 100644 vendor/golang.org/x/crypto/ssh/terminal/util_linux.go create mode 100644 vendor/golang.org/x/crypto/ssh/terminal/util_plan9.go create mode 100644 vendor/golang.org/x/crypto/ssh/terminal/util_solaris.go create mode 100644 vendor/golang.org/x/crypto/ssh/terminal/util_windows.go create mode 100644 vendor/golang.org/x/crypto/ssh/testdata_test.go create mode 100644 vendor/golang.org/x/crypto/ssh/transport.go create mode 100644 vendor/golang.org/x/crypto/ssh/transport_test.go (limited to 'vendor/golang.org/x/crypto') diff --git a/vendor/golang.org/x/crypto/.gitattributes b/vendor/golang.org/x/crypto/.gitattributes new file mode 100644 index 0000000..d2f212e --- /dev/null +++ b/vendor/golang.org/x/crypto/.gitattributes @@ -0,0 +1,10 @@ +# Treat all files in this repo as binary, with no git magic updating +# line endings. Windows users contributing to Go will need to use a +# modern version of git and editors capable of LF line endings. +# +# We'll prevent accidental CRLF line endings from entering the repo +# via the git-review gofmt checks. +# +# See golang.org/issue/9281 + +* -text diff --git a/vendor/golang.org/x/crypto/.gitignore b/vendor/golang.org/x/crypto/.gitignore new file mode 100644 index 0000000..8339fd6 --- /dev/null +++ b/vendor/golang.org/x/crypto/.gitignore @@ -0,0 +1,2 @@ +# Add no patterns to .hgignore except for files generated by the build. +last-change diff --git a/vendor/golang.org/x/crypto/AUTHORS b/vendor/golang.org/x/crypto/AUTHORS new file mode 100644 index 0000000..2b00ddb --- /dev/null +++ b/vendor/golang.org/x/crypto/AUTHORS @@ -0,0 +1,3 @@ +# This source code refers to The Go Authors for copyright purposes. +# The master list of authors is in the main Go distribution, +# visible at https://tip.golang.org/AUTHORS. diff --git a/vendor/golang.org/x/crypto/CONTRIBUTING.md b/vendor/golang.org/x/crypto/CONTRIBUTING.md new file mode 100644 index 0000000..88dff59 --- /dev/null +++ b/vendor/golang.org/x/crypto/CONTRIBUTING.md @@ -0,0 +1,31 @@ +# Contributing to Go + +Go is an open source project. + +It is the work of hundreds of contributors. We appreciate your help! + + +## Filing issues + +When [filing an issue](https://golang.org/issue/new), make sure to answer these five questions: + +1. What version of Go are you using (`go version`)? +2. What operating system and processor architecture are you using? +3. What did you do? +4. What did you expect to see? +5. What did you see instead? + +General questions should go to the [golang-nuts mailing list](https://groups.google.com/group/golang-nuts) instead of the issue tracker. +The gophers there will answer or ask you to file an issue if you've tripped over a bug. + +## Contributing code + +Please read the [Contribution Guidelines](https://golang.org/doc/contribute.html) +before sending patches. + +**We do not accept GitHub pull requests** +(we use [Gerrit](https://code.google.com/p/gerrit/) instead for code review). + +Unless otherwise noted, the Go source files are distributed under +the BSD-style license found in the LICENSE file. + diff --git a/vendor/golang.org/x/crypto/CONTRIBUTORS b/vendor/golang.org/x/crypto/CONTRIBUTORS new file mode 100644 index 0000000..1fbd3e9 --- /dev/null +++ b/vendor/golang.org/x/crypto/CONTRIBUTORS @@ -0,0 +1,3 @@ +# This source code was written by the Go contributors. +# The master list of contributors is in the main Go distribution, +# visible at https://tip.golang.org/CONTRIBUTORS. diff --git a/vendor/golang.org/x/crypto/LICENSE b/vendor/golang.org/x/crypto/LICENSE new file mode 100644 index 0000000..6a66aea --- /dev/null +++ b/vendor/golang.org/x/crypto/LICENSE @@ -0,0 +1,27 @@ +Copyright (c) 2009 The Go Authors. All rights reserved. + +Redistribution and use in source and binary forms, with or without +modification, are permitted provided that the following conditions are +met: + + * Redistributions of source code must retain the above copyright +notice, this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above +copyright notice, this list of conditions and the following disclaimer +in the documentation and/or other materials provided with the +distribution. + * Neither the name of Google Inc. nor the names of its +contributors may be used to endorse or promote products derived from +this software without specific prior written permission. + +THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. diff --git a/vendor/golang.org/x/crypto/PATENTS b/vendor/golang.org/x/crypto/PATENTS new file mode 100644 index 0000000..7330990 --- /dev/null +++ b/vendor/golang.org/x/crypto/PATENTS @@ -0,0 +1,22 @@ +Additional IP Rights Grant (Patents) + +"This implementation" means the copyrightable works distributed by +Google as part of the Go project. + +Google hereby grants to You a perpetual, worldwide, non-exclusive, +no-charge, royalty-free, irrevocable (except as stated in this section) +patent license to make, have made, use, offer to sell, sell, import, +transfer and otherwise run, modify and propagate the contents of this +implementation of Go, where such license applies only to those patent +claims, both currently owned or controlled by Google and acquired in +the future, licensable by Google that are necessarily infringed by this +implementation of Go. This grant does not include claims that would be +infringed only as a consequence of further modification of this +implementation. If you or your agent or exclusive licensee institute or +order or agree to the institution of patent litigation against any +entity (including a cross-claim or counterclaim in a lawsuit) alleging +that this implementation of Go or any code incorporated within this +implementation of Go constitutes direct or contributory patent +infringement, or inducement of patent infringement, then any patent +rights granted to you under this License for this implementation of Go +shall terminate as of the date such litigation is filed. diff --git a/vendor/golang.org/x/crypto/README b/vendor/golang.org/x/crypto/README new file mode 100644 index 0000000..5910f88 --- /dev/null +++ b/vendor/golang.org/x/crypto/README @@ -0,0 +1,3 @@ +This repository holds supplementary Go cryptography libraries. + +To submit changes to this repository, see https://golang.org/doc/contribute.html. diff --git a/vendor/golang.org/x/crypto/blowfish/block.go b/vendor/golang.org/x/crypto/blowfish/block.go new file mode 100644 index 0000000..9d80f19 --- /dev/null +++ b/vendor/golang.org/x/crypto/blowfish/block.go @@ -0,0 +1,159 @@ +// Copyright 2010 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package blowfish + +// getNextWord returns the next big-endian uint32 value from the byte slice +// at the given position in a circular manner, updating the position. +func getNextWord(b []byte, pos *int) uint32 { + var w uint32 + j := *pos + for i := 0; i < 4; i++ { + w = w<<8 | uint32(b[j]) + j++ + if j >= len(b) { + j = 0 + } + } + *pos = j + return w +} + +// ExpandKey performs a key expansion on the given *Cipher. Specifically, it +// performs the Blowfish algorithm's key schedule which sets up the *Cipher's +// pi and substitution tables for calls to Encrypt. This is used, primarily, +// by the bcrypt package to reuse the Blowfish key schedule during its +// set up. It's unlikely that you need to use this directly. +func ExpandKey(key []byte, c *Cipher) { + j := 0 + for i := 0; i < 18; i++ { + // Using inlined getNextWord for performance. + var d uint32 + for k := 0; k < 4; k++ { + d = d<<8 | uint32(key[j]) + j++ + if j >= len(key) { + j = 0 + } + } + c.p[i] ^= d + } + + var l, r uint32 + for i := 0; i < 18; i += 2 { + l, r = encryptBlock(l, r, c) + c.p[i], c.p[i+1] = l, r + } + + for i := 0; i < 256; i += 2 { + l, r = encryptBlock(l, r, c) + c.s0[i], c.s0[i+1] = l, r + } + for i := 0; i < 256; i += 2 { + l, r = encryptBlock(l, r, c) + c.s1[i], c.s1[i+1] = l, r + } + for i := 0; i < 256; i += 2 { + l, r = encryptBlock(l, r, c) + c.s2[i], c.s2[i+1] = l, r + } + for i := 0; i < 256; i += 2 { + l, r = encryptBlock(l, r, c) + c.s3[i], c.s3[i+1] = l, r + } +} + +// This is similar to ExpandKey, but folds the salt during the key +// schedule. While ExpandKey is essentially expandKeyWithSalt with an all-zero +// salt passed in, reusing ExpandKey turns out to be a place of inefficiency +// and specializing it here is useful. +func expandKeyWithSalt(key []byte, salt []byte, c *Cipher) { + j := 0 + for i := 0; i < 18; i++ { + c.p[i] ^= getNextWord(key, &j) + } + + j = 0 + var l, r uint32 + for i := 0; i < 18; i += 2 { + l ^= getNextWord(salt, &j) + r ^= getNextWord(salt, &j) + l, r = encryptBlock(l, r, c) + c.p[i], c.p[i+1] = l, r + } + + for i := 0; i < 256; i += 2 { + l ^= getNextWord(salt, &j) + r ^= getNextWord(salt, &j) + l, r = encryptBlock(l, r, c) + c.s0[i], c.s0[i+1] = l, r + } + + for i := 0; i < 256; i += 2 { + l ^= getNextWord(salt, &j) + r ^= getNextWord(salt, &j) + l, r = encryptBlock(l, r, c) + c.s1[i], c.s1[i+1] = l, r + } + + for i := 0; i < 256; i += 2 { + l ^= getNextWord(salt, &j) + r ^= getNextWord(salt, &j) + l, r = encryptBlock(l, r, c) + c.s2[i], c.s2[i+1] = l, r + } + + for i := 0; i < 256; i += 2 { + l ^= getNextWord(salt, &j) + r ^= getNextWord(salt, &j) + l, r = encryptBlock(l, r, c) + c.s3[i], c.s3[i+1] = l, r + } +} + +func encryptBlock(l, r uint32, c *Cipher) (uint32, uint32) { + xl, xr := l, r + xl ^= c.p[0] + xr ^= ((c.s0[byte(xl>>24)] + c.s1[byte(xl>>16)]) ^ c.s2[byte(xl>>8)]) + c.s3[byte(xl)] ^ c.p[1] + xl ^= ((c.s0[byte(xr>>24)] + c.s1[byte(xr>>16)]) ^ c.s2[byte(xr>>8)]) + c.s3[byte(xr)] ^ c.p[2] + xr ^= ((c.s0[byte(xl>>24)] + c.s1[byte(xl>>16)]) ^ c.s2[byte(xl>>8)]) + c.s3[byte(xl)] ^ c.p[3] + xl ^= ((c.s0[byte(xr>>24)] + c.s1[byte(xr>>16)]) ^ c.s2[byte(xr>>8)]) + c.s3[byte(xr)] ^ c.p[4] + xr ^= ((c.s0[byte(xl>>24)] + c.s1[byte(xl>>16)]) ^ c.s2[byte(xl>>8)]) + c.s3[byte(xl)] ^ c.p[5] + xl ^= ((c.s0[byte(xr>>24)] + c.s1[byte(xr>>16)]) ^ c.s2[byte(xr>>8)]) + c.s3[byte(xr)] ^ c.p[6] + xr ^= ((c.s0[byte(xl>>24)] + c.s1[byte(xl>>16)]) ^ c.s2[byte(xl>>8)]) + c.s3[byte(xl)] ^ c.p[7] + xl ^= ((c.s0[byte(xr>>24)] + c.s1[byte(xr>>16)]) ^ c.s2[byte(xr>>8)]) + c.s3[byte(xr)] ^ c.p[8] + xr ^= ((c.s0[byte(xl>>24)] + c.s1[byte(xl>>16)]) ^ c.s2[byte(xl>>8)]) + c.s3[byte(xl)] ^ c.p[9] + xl ^= ((c.s0[byte(xr>>24)] + c.s1[byte(xr>>16)]) ^ c.s2[byte(xr>>8)]) + c.s3[byte(xr)] ^ c.p[10] + xr ^= ((c.s0[byte(xl>>24)] + c.s1[byte(xl>>16)]) ^ c.s2[byte(xl>>8)]) + c.s3[byte(xl)] ^ c.p[11] + xl ^= ((c.s0[byte(xr>>24)] + c.s1[byte(xr>>16)]) ^ c.s2[byte(xr>>8)]) + c.s3[byte(xr)] ^ c.p[12] + xr ^= ((c.s0[byte(xl>>24)] + c.s1[byte(xl>>16)]) ^ c.s2[byte(xl>>8)]) + c.s3[byte(xl)] ^ c.p[13] + xl ^= ((c.s0[byte(xr>>24)] + c.s1[byte(xr>>16)]) ^ c.s2[byte(xr>>8)]) + c.s3[byte(xr)] ^ c.p[14] + xr ^= ((c.s0[byte(xl>>24)] + c.s1[byte(xl>>16)]) ^ c.s2[byte(xl>>8)]) + c.s3[byte(xl)] ^ c.p[15] + xl ^= ((c.s0[byte(xr>>24)] + c.s1[byte(xr>>16)]) ^ c.s2[byte(xr>>8)]) + c.s3[byte(xr)] ^ c.p[16] + xr ^= c.p[17] + return xr, xl +} + +func decryptBlock(l, r uint32, c *Cipher) (uint32, uint32) { + xl, xr := l, r + xl ^= c.p[17] + xr ^= ((c.s0[byte(xl>>24)] + c.s1[byte(xl>>16)]) ^ c.s2[byte(xl>>8)]) + c.s3[byte(xl)] ^ c.p[16] + xl ^= ((c.s0[byte(xr>>24)] + c.s1[byte(xr>>16)]) ^ c.s2[byte(xr>>8)]) + c.s3[byte(xr)] ^ c.p[15] + xr ^= ((c.s0[byte(xl>>24)] + c.s1[byte(xl>>16)]) ^ c.s2[byte(xl>>8)]) + c.s3[byte(xl)] ^ c.p[14] + xl ^= ((c.s0[byte(xr>>24)] + c.s1[byte(xr>>16)]) ^ c.s2[byte(xr>>8)]) + c.s3[byte(xr)] ^ c.p[13] + xr ^= ((c.s0[byte(xl>>24)] + c.s1[byte(xl>>16)]) ^ c.s2[byte(xl>>8)]) + c.s3[byte(xl)] ^ c.p[12] + xl ^= ((c.s0[byte(xr>>24)] + c.s1[byte(xr>>16)]) ^ c.s2[byte(xr>>8)]) + c.s3[byte(xr)] ^ c.p[11] + xr ^= ((c.s0[byte(xl>>24)] + c.s1[byte(xl>>16)]) ^ c.s2[byte(xl>>8)]) + c.s3[byte(xl)] ^ c.p[10] + xl ^= ((c.s0[byte(xr>>24)] + c.s1[byte(xr>>16)]) ^ c.s2[byte(xr>>8)]) + c.s3[byte(xr)] ^ c.p[9] + xr ^= ((c.s0[byte(xl>>24)] + c.s1[byte(xl>>16)]) ^ c.s2[byte(xl>>8)]) + c.s3[byte(xl)] ^ c.p[8] + xl ^= ((c.s0[byte(xr>>24)] + c.s1[byte(xr>>16)]) ^ c.s2[byte(xr>>8)]) + c.s3[byte(xr)] ^ c.p[7] + xr ^= ((c.s0[byte(xl>>24)] + c.s1[byte(xl>>16)]) ^ c.s2[byte(xl>>8)]) + c.s3[byte(xl)] ^ c.p[6] + xl ^= ((c.s0[byte(xr>>24)] + c.s1[byte(xr>>16)]) ^ c.s2[byte(xr>>8)]) + c.s3[byte(xr)] ^ c.p[5] + xr ^= ((c.s0[byte(xl>>24)] + c.s1[byte(xl>>16)]) ^ c.s2[byte(xl>>8)]) + c.s3[byte(xl)] ^ c.p[4] + xl ^= ((c.s0[byte(xr>>24)] + c.s1[byte(xr>>16)]) ^ c.s2[byte(xr>>8)]) + c.s3[byte(xr)] ^ c.p[3] + xr ^= ((c.s0[byte(xl>>24)] + c.s1[byte(xl>>16)]) ^ c.s2[byte(xl>>8)]) + c.s3[byte(xl)] ^ c.p[2] + xl ^= ((c.s0[byte(xr>>24)] + c.s1[byte(xr>>16)]) ^ c.s2[byte(xr>>8)]) + c.s3[byte(xr)] ^ c.p[1] + xr ^= c.p[0] + return xr, xl +} diff --git a/vendor/golang.org/x/crypto/blowfish/blowfish_test.go b/vendor/golang.org/x/crypto/blowfish/blowfish_test.go new file mode 100644 index 0000000..368ba87 --- /dev/null +++ b/vendor/golang.org/x/crypto/blowfish/blowfish_test.go @@ -0,0 +1,274 @@ +// Copyright 2010 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package blowfish + +import "testing" + +type CryptTest struct { + key []byte + in []byte + out []byte +} + +// Test vector values are from https://www.schneier.com/code/vectors.txt. +var encryptTests = []CryptTest{ + { + []byte{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, + []byte{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, + []byte{0x4E, 0xF9, 0x97, 0x45, 0x61, 0x98, 0xDD, 0x78}}, + { + []byte{0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF}, + []byte{0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF}, + []byte{0x51, 0x86, 0x6F, 0xD5, 0xB8, 0x5E, 0xCB, 0x8A}}, + { + []byte{0x30, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, + []byte{0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01}, + []byte{0x7D, 0x85, 0x6F, 0x9A, 0x61, 0x30, 0x63, 0xF2}}, + { + []byte{0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11}, + []byte{0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11}, + []byte{0x24, 0x66, 0xDD, 0x87, 0x8B, 0x96, 0x3C, 0x9D}}, + + { + []byte{0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD, 0xEF}, + []byte{0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11}, + []byte{0x61, 0xF9, 0xC3, 0x80, 0x22, 0x81, 0xB0, 0x96}}, + { + []byte{0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11}, + []byte{0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD, 0xEF}, + []byte{0x7D, 0x0C, 0xC6, 0x30, 0xAF, 0xDA, 0x1E, 0xC7}}, + { + []byte{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, + []byte{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, + []byte{0x4E, 0xF9, 0x97, 0x45, 0x61, 0x98, 0xDD, 0x78}}, + { + []byte{0xFE, 0xDC, 0xBA, 0x98, 0x76, 0x54, 0x32, 0x10}, + []byte{0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD, 0xEF}, + []byte{0x0A, 0xCE, 0xAB, 0x0F, 0xC6, 0xA0, 0xA2, 0x8D}}, + { + []byte{0x7C, 0xA1, 0x10, 0x45, 0x4A, 0x1A, 0x6E, 0x57}, + []byte{0x01, 0xA1, 0xD6, 0xD0, 0x39, 0x77, 0x67, 0x42}, + []byte{0x59, 0xC6, 0x82, 0x45, 0xEB, 0x05, 0x28, 0x2B}}, + { + []byte{0x01, 0x31, 0xD9, 0x61, 0x9D, 0xC1, 0x37, 0x6E}, + []byte{0x5C, 0xD5, 0x4C, 0xA8, 0x3D, 0xEF, 0x57, 0xDA}, + []byte{0xB1, 0xB8, 0xCC, 0x0B, 0x25, 0x0F, 0x09, 0xA0}}, + { + []byte{0x07, 0xA1, 0x13, 0x3E, 0x4A, 0x0B, 0x26, 0x86}, + []byte{0x02, 0x48, 0xD4, 0x38, 0x06, 0xF6, 0x71, 0x72}, + []byte{0x17, 0x30, 0xE5, 0x77, 0x8B, 0xEA, 0x1D, 0xA4}}, + { + []byte{0x38, 0x49, 0x67, 0x4C, 0x26, 0x02, 0x31, 0x9E}, + []byte{0x51, 0x45, 0x4B, 0x58, 0x2D, 0xDF, 0x44, 0x0A}, + []byte{0xA2, 0x5E, 0x78, 0x56, 0xCF, 0x26, 0x51, 0xEB}}, + { + []byte{0x04, 0xB9, 0x15, 0xBA, 0x43, 0xFE, 0xB5, 0xB6}, + []byte{0x42, 0xFD, 0x44, 0x30, 0x59, 0x57, 0x7F, 0xA2}, + []byte{0x35, 0x38, 0x82, 0xB1, 0x09, 0xCE, 0x8F, 0x1A}}, + { + []byte{0x01, 0x13, 0xB9, 0x70, 0xFD, 0x34, 0xF2, 0xCE}, + []byte{0x05, 0x9B, 0x5E, 0x08, 0x51, 0xCF, 0x14, 0x3A}, + []byte{0x48, 0xF4, 0xD0, 0x88, 0x4C, 0x37, 0x99, 0x18}}, + { + []byte{0x01, 0x70, 0xF1, 0x75, 0x46, 0x8F, 0xB5, 0xE6}, + []byte{0x07, 0x56, 0xD8, 0xE0, 0x77, 0x47, 0x61, 0xD2}, + []byte{0x43, 0x21, 0x93, 0xB7, 0x89, 0x51, 0xFC, 0x98}}, + { + []byte{0x43, 0x29, 0x7F, 0xAD, 0x38, 0xE3, 0x73, 0xFE}, + []byte{0x76, 0x25, 0x14, 0xB8, 0x29, 0xBF, 0x48, 0x6A}, + []byte{0x13, 0xF0, 0x41, 0x54, 0xD6, 0x9D, 0x1A, 0xE5}}, + { + []byte{0x07, 0xA7, 0x13, 0x70, 0x45, 0xDA, 0x2A, 0x16}, + []byte{0x3B, 0xDD, 0x11, 0x90, 0x49, 0x37, 0x28, 0x02}, + []byte{0x2E, 0xED, 0xDA, 0x93, 0xFF, 0xD3, 0x9C, 0x79}}, + { + []byte{0x04, 0x68, 0x91, 0x04, 0xC2, 0xFD, 0x3B, 0x2F}, + []byte{0x26, 0x95, 0x5F, 0x68, 0x35, 0xAF, 0x60, 0x9A}, + []byte{0xD8, 0x87, 0xE0, 0x39, 0x3C, 0x2D, 0xA6, 0xE3}}, + { + []byte{0x37, 0xD0, 0x6B, 0xB5, 0x16, 0xCB, 0x75, 0x46}, + []byte{0x16, 0x4D, 0x5E, 0x40, 0x4F, 0x27, 0x52, 0x32}, + []byte{0x5F, 0x99, 0xD0, 0x4F, 0x5B, 0x16, 0x39, 0x69}}, + { + []byte{0x1F, 0x08, 0x26, 0x0D, 0x1A, 0xC2, 0x46, 0x5E}, + []byte{0x6B, 0x05, 0x6E, 0x18, 0x75, 0x9F, 0x5C, 0xCA}, + []byte{0x4A, 0x05, 0x7A, 0x3B, 0x24, 0xD3, 0x97, 0x7B}}, + { + []byte{0x58, 0x40, 0x23, 0x64, 0x1A, 0xBA, 0x61, 0x76}, + []byte{0x00, 0x4B, 0xD6, 0xEF, 0x09, 0x17, 0x60, 0x62}, + []byte{0x45, 0x20, 0x31, 0xC1, 0xE4, 0xFA, 0xDA, 0x8E}}, + { + []byte{0x02, 0x58, 0x16, 0x16, 0x46, 0x29, 0xB0, 0x07}, + []byte{0x48, 0x0D, 0x39, 0x00, 0x6E, 0xE7, 0x62, 0xF2}, + []byte{0x75, 0x55, 0xAE, 0x39, 0xF5, 0x9B, 0x87, 0xBD}}, + { + []byte{0x49, 0x79, 0x3E, 0xBC, 0x79, 0xB3, 0x25, 0x8F}, + []byte{0x43, 0x75, 0x40, 0xC8, 0x69, 0x8F, 0x3C, 0xFA}, + []byte{0x53, 0xC5, 0x5F, 0x9C, 0xB4, 0x9F, 0xC0, 0x19}}, + { + []byte{0x4F, 0xB0, 0x5E, 0x15, 0x15, 0xAB, 0x73, 0xA7}, + []byte{0x07, 0x2D, 0x43, 0xA0, 0x77, 0x07, 0x52, 0x92}, + []byte{0x7A, 0x8E, 0x7B, 0xFA, 0x93, 0x7E, 0x89, 0xA3}}, + { + []byte{0x49, 0xE9, 0x5D, 0x6D, 0x4C, 0xA2, 0x29, 0xBF}, + []byte{0x02, 0xFE, 0x55, 0x77, 0x81, 0x17, 0xF1, 0x2A}, + []byte{0xCF, 0x9C, 0x5D, 0x7A, 0x49, 0x86, 0xAD, 0xB5}}, + { + []byte{0x01, 0x83, 0x10, 0xDC, 0x40, 0x9B, 0x26, 0xD6}, + []byte{0x1D, 0x9D, 0x5C, 0x50, 0x18, 0xF7, 0x28, 0xC2}, + []byte{0xD1, 0xAB, 0xB2, 0x90, 0x65, 0x8B, 0xC7, 0x78}}, + { + []byte{0x1C, 0x58, 0x7F, 0x1C, 0x13, 0x92, 0x4F, 0xEF}, + []byte{0x30, 0x55, 0x32, 0x28, 0x6D, 0x6F, 0x29, 0x5A}, + []byte{0x55, 0xCB, 0x37, 0x74, 0xD1, 0x3E, 0xF2, 0x01}}, + { + []byte{0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01}, + []byte{0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD, 0xEF}, + []byte{0xFA, 0x34, 0xEC, 0x48, 0x47, 0xB2, 0x68, 0xB2}}, + { + []byte{0x1F, 0x1F, 0x1F, 0x1F, 0x0E, 0x0E, 0x0E, 0x0E}, + []byte{0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD, 0xEF}, + []byte{0xA7, 0x90, 0x79, 0x51, 0x08, 0xEA, 0x3C, 0xAE}}, + { + []byte{0xE0, 0xFE, 0xE0, 0xFE, 0xF1, 0xFE, 0xF1, 0xFE}, + []byte{0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD, 0xEF}, + []byte{0xC3, 0x9E, 0x07, 0x2D, 0x9F, 0xAC, 0x63, 0x1D}}, + { + []byte{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, + []byte{0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF}, + []byte{0x01, 0x49, 0x33, 0xE0, 0xCD, 0xAF, 0xF6, 0xE4}}, + { + []byte{0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF}, + []byte{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, + []byte{0xF2, 0x1E, 0x9A, 0x77, 0xB7, 0x1C, 0x49, 0xBC}}, + { + []byte{0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD, 0xEF}, + []byte{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, + []byte{0x24, 0x59, 0x46, 0x88, 0x57, 0x54, 0x36, 0x9A}}, + { + []byte{0xFE, 0xDC, 0xBA, 0x98, 0x76, 0x54, 0x32, 0x10}, + []byte{0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF}, + []byte{0x6B, 0x5C, 0x5A, 0x9C, 0x5D, 0x9E, 0x0A, 0x5A}}, +} + +func TestCipherEncrypt(t *testing.T) { + for i, tt := range encryptTests { + c, err := NewCipher(tt.key) + if err != nil { + t.Errorf("NewCipher(%d bytes) = %s", len(tt.key), err) + continue + } + ct := make([]byte, len(tt.out)) + c.Encrypt(ct, tt.in) + for j, v := range ct { + if v != tt.out[j] { + t.Errorf("Cipher.Encrypt, test vector #%d: cipher-text[%d] = %#x, expected %#x", i, j, v, tt.out[j]) + break + } + } + } +} + +func TestCipherDecrypt(t *testing.T) { + for i, tt := range encryptTests { + c, err := NewCipher(tt.key) + if err != nil { + t.Errorf("NewCipher(%d bytes) = %s", len(tt.key), err) + continue + } + pt := make([]byte, len(tt.in)) + c.Decrypt(pt, tt.out) + for j, v := range pt { + if v != tt.in[j] { + t.Errorf("Cipher.Decrypt, test vector #%d: plain-text[%d] = %#x, expected %#x", i, j, v, tt.in[j]) + break + } + } + } +} + +func TestSaltedCipherKeyLength(t *testing.T) { + if _, err := NewSaltedCipher(nil, []byte{'a'}); err != KeySizeError(0) { + t.Errorf("NewSaltedCipher with short key, gave error %#v, expected %#v", err, KeySizeError(0)) + } + + // A 57-byte key. One over the typical blowfish restriction. + key := []byte("012345678901234567890123456789012345678901234567890123456") + if _, err := NewSaltedCipher(key, []byte{'a'}); err != nil { + t.Errorf("NewSaltedCipher with long key, gave error %#v", err) + } +} + +// Test vectors generated with Blowfish from OpenSSH. +var saltedVectors = [][8]byte{ + {0x0c, 0x82, 0x3b, 0x7b, 0x8d, 0x01, 0x4b, 0x7e}, + {0xd1, 0xe1, 0x93, 0xf0, 0x70, 0xa6, 0xdb, 0x12}, + {0xfc, 0x5e, 0xba, 0xde, 0xcb, 0xf8, 0x59, 0xad}, + {0x8a, 0x0c, 0x76, 0xe7, 0xdd, 0x2c, 0xd3, 0xa8}, + {0x2c, 0xcb, 0x7b, 0xee, 0xac, 0x7b, 0x7f, 0xf8}, + {0xbb, 0xf6, 0x30, 0x6f, 0xe1, 0x5d, 0x62, 0xbf}, + {0x97, 0x1e, 0xc1, 0x3d, 0x3d, 0xe0, 0x11, 0xe9}, + {0x06, 0xd7, 0x4d, 0xb1, 0x80, 0xa3, 0xb1, 0x38}, + {0x67, 0xa1, 0xa9, 0x75, 0x0e, 0x5b, 0xc6, 0xb4}, + {0x51, 0x0f, 0x33, 0x0e, 0x4f, 0x67, 0xd2, 0x0c}, + {0xf1, 0x73, 0x7e, 0xd8, 0x44, 0xea, 0xdb, 0xe5}, + {0x14, 0x0e, 0x16, 0xce, 0x7f, 0x4a, 0x9c, 0x7b}, + {0x4b, 0xfe, 0x43, 0xfd, 0xbf, 0x36, 0x04, 0x47}, + {0xb1, 0xeb, 0x3e, 0x15, 0x36, 0xa7, 0xbb, 0xe2}, + {0x6d, 0x0b, 0x41, 0xdd, 0x00, 0x98, 0x0b, 0x19}, + {0xd3, 0xce, 0x45, 0xce, 0x1d, 0x56, 0xb7, 0xfc}, + {0xd9, 0xf0, 0xfd, 0xda, 0xc0, 0x23, 0xb7, 0x93}, + {0x4c, 0x6f, 0xa1, 0xe4, 0x0c, 0xa8, 0xca, 0x57}, + {0xe6, 0x2f, 0x28, 0xa7, 0x0c, 0x94, 0x0d, 0x08}, + {0x8f, 0xe3, 0xf0, 0xb6, 0x29, 0xe3, 0x44, 0x03}, + {0xff, 0x98, 0xdd, 0x04, 0x45, 0xb4, 0x6d, 0x1f}, + {0x9e, 0x45, 0x4d, 0x18, 0x40, 0x53, 0xdb, 0xef}, + {0xb7, 0x3b, 0xef, 0x29, 0xbe, 0xa8, 0x13, 0x71}, + {0x02, 0x54, 0x55, 0x41, 0x8e, 0x04, 0xfc, 0xad}, + {0x6a, 0x0a, 0xee, 0x7c, 0x10, 0xd9, 0x19, 0xfe}, + {0x0a, 0x22, 0xd9, 0x41, 0xcc, 0x23, 0x87, 0x13}, + {0x6e, 0xff, 0x1f, 0xff, 0x36, 0x17, 0x9c, 0xbe}, + {0x79, 0xad, 0xb7, 0x40, 0xf4, 0x9f, 0x51, 0xa6}, + {0x97, 0x81, 0x99, 0xa4, 0xde, 0x9e, 0x9f, 0xb6}, + {0x12, 0x19, 0x7a, 0x28, 0xd0, 0xdc, 0xcc, 0x92}, + {0x81, 0xda, 0x60, 0x1e, 0x0e, 0xdd, 0x65, 0x56}, + {0x7d, 0x76, 0x20, 0xb2, 0x73, 0xc9, 0x9e, 0xee}, +} + +func TestSaltedCipher(t *testing.T) { + var key, salt [32]byte + for i := range key { + key[i] = byte(i) + salt[i] = byte(i + 32) + } + for i, v := range saltedVectors { + c, err := NewSaltedCipher(key[:], salt[:i]) + if err != nil { + t.Fatal(err) + } + var buf [8]byte + c.Encrypt(buf[:], buf[:]) + if v != buf { + t.Errorf("%d: expected %x, got %x", i, v, buf) + } + } +} + +func BenchmarkExpandKeyWithSalt(b *testing.B) { + key := make([]byte, 32) + salt := make([]byte, 16) + c, _ := NewCipher(key) + for i := 0; i < b.N; i++ { + expandKeyWithSalt(key, salt, c) + } +} + +func BenchmarkExpandKey(b *testing.B) { + key := make([]byte, 32) + c, _ := NewCipher(key) + for i := 0; i < b.N; i++ { + ExpandKey(key, c) + } +} diff --git a/vendor/golang.org/x/crypto/blowfish/cipher.go b/vendor/golang.org/x/crypto/blowfish/cipher.go new file mode 100644 index 0000000..2641dad --- /dev/null +++ b/vendor/golang.org/x/crypto/blowfish/cipher.go @@ -0,0 +1,91 @@ +// Copyright 2010 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// Package blowfish implements Bruce Schneier's Blowfish encryption algorithm. +package blowfish // import "golang.org/x/crypto/blowfish" + +// The code is a port of Bruce Schneier's C implementation. +// See https://www.schneier.com/blowfish.html. + +import "strconv" + +// The Blowfish block size in bytes. +const BlockSize = 8 + +// A Cipher is an instance of Blowfish encryption using a particular key. +type Cipher struct { + p [18]uint32 + s0, s1, s2, s3 [256]uint32 +} + +type KeySizeError int + +func (k KeySizeError) Error() string { + return "crypto/blowfish: invalid key size " + strconv.Itoa(int(k)) +} + +// NewCipher creates and returns a Cipher. +// The key argument should be the Blowfish key, from 1 to 56 bytes. +func NewCipher(key []byte) (*Cipher, error) { + var result Cipher + if k := len(key); k < 1 || k > 56 { + return nil, KeySizeError(k) + } + initCipher(&result) + ExpandKey(key, &result) + return &result, nil +} + +// NewSaltedCipher creates a returns a Cipher that folds a salt into its key +// schedule. For most purposes, NewCipher, instead of NewSaltedCipher, is +// sufficient and desirable. For bcrypt compatibility, the key can be over 56 +// bytes. +func NewSaltedCipher(key, salt []byte) (*Cipher, error) { + if len(salt) == 0 { + return NewCipher(key) + } + var result Cipher + if k := len(key); k < 1 { + return nil, KeySizeError(k) + } + initCipher(&result) + expandKeyWithSalt(key, salt, &result) + return &result, nil +} + +// BlockSize returns the Blowfish block size, 8 bytes. +// It is necessary to satisfy the Block interface in the +// package "crypto/cipher". +func (c *Cipher) BlockSize() int { return BlockSize } + +// Encrypt encrypts the 8-byte buffer src using the key k +// and stores the result in dst. +// Note that for amounts of data larger than a block, +// it is not safe to just call Encrypt on successive blocks; +// instead, use an encryption mode like CBC (see crypto/cipher/cbc.go). +func (c *Cipher) Encrypt(dst, src []byte) { + l := uint32(src[0])<<24 | uint32(src[1])<<16 | uint32(src[2])<<8 | uint32(src[3]) + r := uint32(src[4])<<24 | uint32(src[5])<<16 | uint32(src[6])<<8 | uint32(src[7]) + l, r = encryptBlock(l, r, c) + dst[0], dst[1], dst[2], dst[3] = byte(l>>24), byte(l>>16), byte(l>>8), byte(l) + dst[4], dst[5], dst[6], dst[7] = byte(r>>24), byte(r>>16), byte(r>>8), byte(r) +} + +// Decrypt decrypts the 8-byte buffer src using the key k +// and stores the result in dst. +func (c *Cipher) Decrypt(dst, src []byte) { + l := uint32(src[0])<<24 | uint32(src[1])<<16 | uint32(src[2])<<8 | uint32(src[3]) + r := uint32(src[4])<<24 | uint32(src[5])<<16 | uint32(src[6])<<8 | uint32(src[7]) + l, r = decryptBlock(l, r, c) + dst[0], dst[1], dst[2], dst[3] = byte(l>>24), byte(l>>16), byte(l>>8), byte(l) + dst[4], dst[5], dst[6], dst[7] = byte(r>>24), byte(r>>16), byte(r>>8), byte(r) +} + +func initCipher(c *Cipher) { + copy(c.p[0:], p[0:]) + copy(c.s0[0:], s0[0:]) + copy(c.s1[0:], s1[0:]) + copy(c.s2[0:], s2[0:]) + copy(c.s3[0:], s3[0:]) +} diff --git a/vendor/golang.org/x/crypto/blowfish/const.go b/vendor/golang.org/x/crypto/blowfish/const.go new file mode 100644 index 0000000..d040775 --- /dev/null +++ b/vendor/golang.org/x/crypto/blowfish/const.go @@ -0,0 +1,199 @@ +// Copyright 2010 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// The startup permutation array and substitution boxes. +// They are the hexadecimal digits of PI; see: +// https://www.schneier.com/code/constants.txt. + +package blowfish + +var s0 = [256]uint32{ + 0xd1310ba6, 0x98dfb5ac, 0x2ffd72db, 0xd01adfb7, 0xb8e1afed, 0x6a267e96, + 0xba7c9045, 0xf12c7f99, 0x24a19947, 0xb3916cf7, 0x0801f2e2, 0x858efc16, + 0x636920d8, 0x71574e69, 0xa458fea3, 0xf4933d7e, 0x0d95748f, 0x728eb658, + 0x718bcd58, 0x82154aee, 0x7b54a41d, 0xc25a59b5, 0x9c30d539, 0x2af26013, + 0xc5d1b023, 0x286085f0, 0xca417918, 0xb8db38ef, 0x8e79dcb0, 0x603a180e, + 0x6c9e0e8b, 0xb01e8a3e, 0xd71577c1, 0xbd314b27, 0x78af2fda, 0x55605c60, + 0xe65525f3, 0xaa55ab94, 0x57489862, 0x63e81440, 0x55ca396a, 0x2aab10b6, + 0xb4cc5c34, 0x1141e8ce, 0xa15486af, 0x7c72e993, 0xb3ee1411, 0x636fbc2a, + 0x2ba9c55d, 0x741831f6, 0xce5c3e16, 0x9b87931e, 0xafd6ba33, 0x6c24cf5c, + 0x7a325381, 0x28958677, 0x3b8f4898, 0x6b4bb9af, 0xc4bfe81b, 0x66282193, + 0x61d809cc, 0xfb21a991, 0x487cac60, 0x5dec8032, 0xef845d5d, 0xe98575b1, + 0xdc262302, 0xeb651b88, 0x23893e81, 0xd396acc5, 0x0f6d6ff3, 0x83f44239, + 0x2e0b4482, 0xa4842004, 0x69c8f04a, 0x9e1f9b5e, 0x21c66842, 0xf6e96c9a, + 0x670c9c61, 0xabd388f0, 0x6a51a0d2, 0xd8542f68, 0x960fa728, 0xab5133a3, + 0x6eef0b6c, 0x137a3be4, 0xba3bf050, 0x7efb2a98, 0xa1f1651d, 0x39af0176, + 0x66ca593e, 0x82430e88, 0x8cee8619, 0x456f9fb4, 0x7d84a5c3, 0x3b8b5ebe, + 0xe06f75d8, 0x85c12073, 0x401a449f, 0x56c16aa6, 0x4ed3aa62, 0x363f7706, + 0x1bfedf72, 0x429b023d, 0x37d0d724, 0xd00a1248, 0xdb0fead3, 0x49f1c09b, + 0x075372c9, 0x80991b7b, 0x25d479d8, 0xf6e8def7, 0xe3fe501a, 0xb6794c3b, + 0x976ce0bd, 0x04c006ba, 0xc1a94fb6, 0x409f60c4, 0x5e5c9ec2, 0x196a2463, + 0x68fb6faf, 0x3e6c53b5, 0x1339b2eb, 0x3b52ec6f, 0x6dfc511f, 0x9b30952c, + 0xcc814544, 0xaf5ebd09, 0xbee3d004, 0xde334afd, 0x660f2807, 0x192e4bb3, + 0xc0cba857, 0x45c8740f, 0xd20b5f39, 0xb9d3fbdb, 0x5579c0bd, 0x1a60320a, + 0xd6a100c6, 0x402c7279, 0x679f25fe, 0xfb1fa3cc, 0x8ea5e9f8, 0xdb3222f8, + 0x3c7516df, 0xfd616b15, 0x2f501ec8, 0xad0552ab, 0x323db5fa, 0xfd238760, + 0x53317b48, 0x3e00df82, 0x9e5c57bb, 0xca6f8ca0, 0x1a87562e, 0xdf1769db, + 0xd542a8f6, 0x287effc3, 0xac6732c6, 0x8c4f5573, 0x695b27b0, 0xbbca58c8, + 0xe1ffa35d, 0xb8f011a0, 0x10fa3d98, 0xfd2183b8, 0x4afcb56c, 0x2dd1d35b, + 0x9a53e479, 0xb6f84565, 0xd28e49bc, 0x4bfb9790, 0xe1ddf2da, 0xa4cb7e33, + 0x62fb1341, 0xcee4c6e8, 0xef20cada, 0x36774c01, 0xd07e9efe, 0x2bf11fb4, + 0x95dbda4d, 0xae909198, 0xeaad8e71, 0x6b93d5a0, 0xd08ed1d0, 0xafc725e0, + 0x8e3c5b2f, 0x8e7594b7, 0x8ff6e2fb, 0xf2122b64, 0x8888b812, 0x900df01c, + 0x4fad5ea0, 0x688fc31c, 0xd1cff191, 0xb3a8c1ad, 0x2f2f2218, 0xbe0e1777, + 0xea752dfe, 0x8b021fa1, 0xe5a0cc0f, 0xb56f74e8, 0x18acf3d6, 0xce89e299, + 0xb4a84fe0, 0xfd13e0b7, 0x7cc43b81, 0xd2ada8d9, 0x165fa266, 0x80957705, + 0x93cc7314, 0x211a1477, 0xe6ad2065, 0x77b5fa86, 0xc75442f5, 0xfb9d35cf, + 0xebcdaf0c, 0x7b3e89a0, 0xd6411bd3, 0xae1e7e49, 0x00250e2d, 0x2071b35e, + 0x226800bb, 0x57b8e0af, 0x2464369b, 0xf009b91e, 0x5563911d, 0x59dfa6aa, + 0x78c14389, 0xd95a537f, 0x207d5ba2, 0x02e5b9c5, 0x83260376, 0x6295cfa9, + 0x11c81968, 0x4e734a41, 0xb3472dca, 0x7b14a94a, 0x1b510052, 0x9a532915, + 0xd60f573f, 0xbc9bc6e4, 0x2b60a476, 0x81e67400, 0x08ba6fb5, 0x571be91f, + 0xf296ec6b, 0x2a0dd915, 0xb6636521, 0xe7b9f9b6, 0xff34052e, 0xc5855664, + 0x53b02d5d, 0xa99f8fa1, 0x08ba4799, 0x6e85076a, +} + +var s1 = [256]uint32{ + 0x4b7a70e9, 0xb5b32944, 0xdb75092e, 0xc4192623, 0xad6ea6b0, 0x49a7df7d, + 0x9cee60b8, 0x8fedb266, 0xecaa8c71, 0x699a17ff, 0x5664526c, 0xc2b19ee1, + 0x193602a5, 0x75094c29, 0xa0591340, 0xe4183a3e, 0x3f54989a, 0x5b429d65, + 0x6b8fe4d6, 0x99f73fd6, 0xa1d29c07, 0xefe830f5, 0x4d2d38e6, 0xf0255dc1, + 0x4cdd2086, 0x8470eb26, 0x6382e9c6, 0x021ecc5e, 0x09686b3f, 0x3ebaefc9, + 0x3c971814, 0x6b6a70a1, 0x687f3584, 0x52a0e286, 0xb79c5305, 0xaa500737, + 0x3e07841c, 0x7fdeae5c, 0x8e7d44ec, 0x5716f2b8, 0xb03ada37, 0xf0500c0d, + 0xf01c1f04, 0x0200b3ff, 0xae0cf51a, 0x3cb574b2, 0x25837a58, 0xdc0921bd, + 0xd19113f9, 0x7ca92ff6, 0x94324773, 0x22f54701, 0x3ae5e581, 0x37c2dadc, + 0xc8b57634, 0x9af3dda7, 0xa9446146, 0x0fd0030e, 0xecc8c73e, 0xa4751e41, + 0xe238cd99, 0x3bea0e2f, 0x3280bba1, 0x183eb331, 0x4e548b38, 0x4f6db908, + 0x6f420d03, 0xf60a04bf, 0x2cb81290, 0x24977c79, 0x5679b072, 0xbcaf89af, + 0xde9a771f, 0xd9930810, 0xb38bae12, 0xdccf3f2e, 0x5512721f, 0x2e6b7124, + 0x501adde6, 0x9f84cd87, 0x7a584718, 0x7408da17, 0xbc9f9abc, 0xe94b7d8c, + 0xec7aec3a, 0xdb851dfa, 0x63094366, 0xc464c3d2, 0xef1c1847, 0x3215d908, + 0xdd433b37, 0x24c2ba16, 0x12a14d43, 0x2a65c451, 0x50940002, 0x133ae4dd, + 0x71dff89e, 0x10314e55, 0x81ac77d6, 0x5f11199b, 0x043556f1, 0xd7a3c76b, + 0x3c11183b, 0x5924a509, 0xf28fe6ed, 0x97f1fbfa, 0x9ebabf2c, 0x1e153c6e, + 0x86e34570, 0xeae96fb1, 0x860e5e0a, 0x5a3e2ab3, 0x771fe71c, 0x4e3d06fa, + 0x2965dcb9, 0x99e71d0f, 0x803e89d6, 0x5266c825, 0x2e4cc978, 0x9c10b36a, + 0xc6150eba, 0x94e2ea78, 0xa5fc3c53, 0x1e0a2df4, 0xf2f74ea7, 0x361d2b3d, + 0x1939260f, 0x19c27960, 0x5223a708, 0xf71312b6, 0xebadfe6e, 0xeac31f66, + 0xe3bc4595, 0xa67bc883, 0xb17f37d1, 0x018cff28, 0xc332ddef, 0xbe6c5aa5, + 0x65582185, 0x68ab9802, 0xeecea50f, 0xdb2f953b, 0x2aef7dad, 0x5b6e2f84, + 0x1521b628, 0x29076170, 0xecdd4775, 0x619f1510, 0x13cca830, 0xeb61bd96, + 0x0334fe1e, 0xaa0363cf, 0xb5735c90, 0x4c70a239, 0xd59e9e0b, 0xcbaade14, + 0xeecc86bc, 0x60622ca7, 0x9cab5cab, 0xb2f3846e, 0x648b1eaf, 0x19bdf0ca, + 0xa02369b9, 0x655abb50, 0x40685a32, 0x3c2ab4b3, 0x319ee9d5, 0xc021b8f7, + 0x9b540b19, 0x875fa099, 0x95f7997e, 0x623d7da8, 0xf837889a, 0x97e32d77, + 0x11ed935f, 0x16681281, 0x0e358829, 0xc7e61fd6, 0x96dedfa1, 0x7858ba99, + 0x57f584a5, 0x1b227263, 0x9b83c3ff, 0x1ac24696, 0xcdb30aeb, 0x532e3054, + 0x8fd948e4, 0x6dbc3128, 0x58ebf2ef, 0x34c6ffea, 0xfe28ed61, 0xee7c3c73, + 0x5d4a14d9, 0xe864b7e3, 0x42105d14, 0x203e13e0, 0x45eee2b6, 0xa3aaabea, + 0xdb6c4f15, 0xfacb4fd0, 0xc742f442, 0xef6abbb5, 0x654f3b1d, 0x41cd2105, + 0xd81e799e, 0x86854dc7, 0xe44b476a, 0x3d816250, 0xcf62a1f2, 0x5b8d2646, + 0xfc8883a0, 0xc1c7b6a3, 0x7f1524c3, 0x69cb7492, 0x47848a0b, 0x5692b285, + 0x095bbf00, 0xad19489d, 0x1462b174, 0x23820e00, 0x58428d2a, 0x0c55f5ea, + 0x1dadf43e, 0x233f7061, 0x3372f092, 0x8d937e41, 0xd65fecf1, 0x6c223bdb, + 0x7cde3759, 0xcbee7460, 0x4085f2a7, 0xce77326e, 0xa6078084, 0x19f8509e, + 0xe8efd855, 0x61d99735, 0xa969a7aa, 0xc50c06c2, 0x5a04abfc, 0x800bcadc, + 0x9e447a2e, 0xc3453484, 0xfdd56705, 0x0e1e9ec9, 0xdb73dbd3, 0x105588cd, + 0x675fda79, 0xe3674340, 0xc5c43465, 0x713e38d8, 0x3d28f89e, 0xf16dff20, + 0x153e21e7, 0x8fb03d4a, 0xe6e39f2b, 0xdb83adf7, +} + +var s2 = [256]uint32{ + 0xe93d5a68, 0x948140f7, 0xf64c261c, 0x94692934, 0x411520f7, 0x7602d4f7, + 0xbcf46b2e, 0xd4a20068, 0xd4082471, 0x3320f46a, 0x43b7d4b7, 0x500061af, + 0x1e39f62e, 0x97244546, 0x14214f74, 0xbf8b8840, 0x4d95fc1d, 0x96b591af, + 0x70f4ddd3, 0x66a02f45, 0xbfbc09ec, 0x03bd9785, 0x7fac6dd0, 0x31cb8504, + 0x96eb27b3, 0x55fd3941, 0xda2547e6, 0xabca0a9a, 0x28507825, 0x530429f4, + 0x0a2c86da, 0xe9b66dfb, 0x68dc1462, 0xd7486900, 0x680ec0a4, 0x27a18dee, + 0x4f3ffea2, 0xe887ad8c, 0xb58ce006, 0x7af4d6b6, 0xaace1e7c, 0xd3375fec, + 0xce78a399, 0x406b2a42, 0x20fe9e35, 0xd9f385b9, 0xee39d7ab, 0x3b124e8b, + 0x1dc9faf7, 0x4b6d1856, 0x26a36631, 0xeae397b2, 0x3a6efa74, 0xdd5b4332, + 0x6841e7f7, 0xca7820fb, 0xfb0af54e, 0xd8feb397, 0x454056ac, 0xba489527, + 0x55533a3a, 0x20838d87, 0xfe6ba9b7, 0xd096954b, 0x55a867bc, 0xa1159a58, + 0xcca92963, 0x99e1db33, 0xa62a4a56, 0x3f3125f9, 0x5ef47e1c, 0x9029317c, + 0xfdf8e802, 0x04272f70, 0x80bb155c, 0x05282ce3, 0x95c11548, 0xe4c66d22, + 0x48c1133f, 0xc70f86dc, 0x07f9c9ee, 0x41041f0f, 0x404779a4, 0x5d886e17, + 0x325f51eb, 0xd59bc0d1, 0xf2bcc18f, 0x41113564, 0x257b7834, 0x602a9c60, + 0xdff8e8a3, 0x1f636c1b, 0x0e12b4c2, 0x02e1329e, 0xaf664fd1, 0xcad18115, + 0x6b2395e0, 0x333e92e1, 0x3b240b62, 0xeebeb922, 0x85b2a20e, 0xe6ba0d99, + 0xde720c8c, 0x2da2f728, 0xd0127845, 0x95b794fd, 0x647d0862, 0xe7ccf5f0, + 0x5449a36f, 0x877d48fa, 0xc39dfd27, 0xf33e8d1e, 0x0a476341, 0x992eff74, + 0x3a6f6eab, 0xf4f8fd37, 0xa812dc60, 0xa1ebddf8, 0x991be14c, 0xdb6e6b0d, + 0xc67b5510, 0x6d672c37, 0x2765d43b, 0xdcd0e804, 0xf1290dc7, 0xcc00ffa3, + 0xb5390f92, 0x690fed0b, 0x667b9ffb, 0xcedb7d9c, 0xa091cf0b, 0xd9155ea3, + 0xbb132f88, 0x515bad24, 0x7b9479bf, 0x763bd6eb, 0x37392eb3, 0xcc115979, + 0x8026e297, 0xf42e312d, 0x6842ada7, 0xc66a2b3b, 0x12754ccc, 0x782ef11c, + 0x6a124237, 0xb79251e7, 0x06a1bbe6, 0x4bfb6350, 0x1a6b1018, 0x11caedfa, + 0x3d25bdd8, 0xe2e1c3c9, 0x44421659, 0x0a121386, 0xd90cec6e, 0xd5abea2a, + 0x64af674e, 0xda86a85f, 0xbebfe988, 0x64e4c3fe, 0x9dbc8057, 0xf0f7c086, + 0x60787bf8, 0x6003604d, 0xd1fd8346, 0xf6381fb0, 0x7745ae04, 0xd736fccc, + 0x83426b33, 0xf01eab71, 0xb0804187, 0x3c005e5f, 0x77a057be, 0xbde8ae24, + 0x55464299, 0xbf582e61, 0x4e58f48f, 0xf2ddfda2, 0xf474ef38, 0x8789bdc2, + 0x5366f9c3, 0xc8b38e74, 0xb475f255, 0x46fcd9b9, 0x7aeb2661, 0x8b1ddf84, + 0x846a0e79, 0x915f95e2, 0x466e598e, 0x20b45770, 0x8cd55591, 0xc902de4c, + 0xb90bace1, 0xbb8205d0, 0x11a86248, 0x7574a99e, 0xb77f19b6, 0xe0a9dc09, + 0x662d09a1, 0xc4324633, 0xe85a1f02, 0x09f0be8c, 0x4a99a025, 0x1d6efe10, + 0x1ab93d1d, 0x0ba5a4df, 0xa186f20f, 0x2868f169, 0xdcb7da83, 0x573906fe, + 0xa1e2ce9b, 0x4fcd7f52, 0x50115e01, 0xa70683fa, 0xa002b5c4, 0x0de6d027, + 0x9af88c27, 0x773f8641, 0xc3604c06, 0x61a806b5, 0xf0177a28, 0xc0f586e0, + 0x006058aa, 0x30dc7d62, 0x11e69ed7, 0x2338ea63, 0x53c2dd94, 0xc2c21634, + 0xbbcbee56, 0x90bcb6de, 0xebfc7da1, 0xce591d76, 0x6f05e409, 0x4b7c0188, + 0x39720a3d, 0x7c927c24, 0x86e3725f, 0x724d9db9, 0x1ac15bb4, 0xd39eb8fc, + 0xed545578, 0x08fca5b5, 0xd83d7cd3, 0x4dad0fc4, 0x1e50ef5e, 0xb161e6f8, + 0xa28514d9, 0x6c51133c, 0x6fd5c7e7, 0x56e14ec4, 0x362abfce, 0xddc6c837, + 0xd79a3234, 0x92638212, 0x670efa8e, 0x406000e0, +} + +var s3 = [256]uint32{ + 0x3a39ce37, 0xd3faf5cf, 0xabc27737, 0x5ac52d1b, 0x5cb0679e, 0x4fa33742, + 0xd3822740, 0x99bc9bbe, 0xd5118e9d, 0xbf0f7315, 0xd62d1c7e, 0xc700c47b, + 0xb78c1b6b, 0x21a19045, 0xb26eb1be, 0x6a366eb4, 0x5748ab2f, 0xbc946e79, + 0xc6a376d2, 0x6549c2c8, 0x530ff8ee, 0x468dde7d, 0xd5730a1d, 0x4cd04dc6, + 0x2939bbdb, 0xa9ba4650, 0xac9526e8, 0xbe5ee304, 0xa1fad5f0, 0x6a2d519a, + 0x63ef8ce2, 0x9a86ee22, 0xc089c2b8, 0x43242ef6, 0xa51e03aa, 0x9cf2d0a4, + 0x83c061ba, 0x9be96a4d, 0x8fe51550, 0xba645bd6, 0x2826a2f9, 0xa73a3ae1, + 0x4ba99586, 0xef5562e9, 0xc72fefd3, 0xf752f7da, 0x3f046f69, 0x77fa0a59, + 0x80e4a915, 0x87b08601, 0x9b09e6ad, 0x3b3ee593, 0xe990fd5a, 0x9e34d797, + 0x2cf0b7d9, 0x022b8b51, 0x96d5ac3a, 0x017da67d, 0xd1cf3ed6, 0x7c7d2d28, + 0x1f9f25cf, 0xadf2b89b, 0x5ad6b472, 0x5a88f54c, 0xe029ac71, 0xe019a5e6, + 0x47b0acfd, 0xed93fa9b, 0xe8d3c48d, 0x283b57cc, 0xf8d56629, 0x79132e28, + 0x785f0191, 0xed756055, 0xf7960e44, 0xe3d35e8c, 0x15056dd4, 0x88f46dba, + 0x03a16125, 0x0564f0bd, 0xc3eb9e15, 0x3c9057a2, 0x97271aec, 0xa93a072a, + 0x1b3f6d9b, 0x1e6321f5, 0xf59c66fb, 0x26dcf319, 0x7533d928, 0xb155fdf5, + 0x03563482, 0x8aba3cbb, 0x28517711, 0xc20ad9f8, 0xabcc5167, 0xccad925f, + 0x4de81751, 0x3830dc8e, 0x379d5862, 0x9320f991, 0xea7a90c2, 0xfb3e7bce, + 0x5121ce64, 0x774fbe32, 0xa8b6e37e, 0xc3293d46, 0x48de5369, 0x6413e680, + 0xa2ae0810, 0xdd6db224, 0x69852dfd, 0x09072166, 0xb39a460a, 0x6445c0dd, + 0x586cdecf, 0x1c20c8ae, 0x5bbef7dd, 0x1b588d40, 0xccd2017f, 0x6bb4e3bb, + 0xdda26a7e, 0x3a59ff45, 0x3e350a44, 0xbcb4cdd5, 0x72eacea8, 0xfa6484bb, + 0x8d6612ae, 0xbf3c6f47, 0xd29be463, 0x542f5d9e, 0xaec2771b, 0xf64e6370, + 0x740e0d8d, 0xe75b1357, 0xf8721671, 0xaf537d5d, 0x4040cb08, 0x4eb4e2cc, + 0x34d2466a, 0x0115af84, 0xe1b00428, 0x95983a1d, 0x06b89fb4, 0xce6ea048, + 0x6f3f3b82, 0x3520ab82, 0x011a1d4b, 0x277227f8, 0x611560b1, 0xe7933fdc, + 0xbb3a792b, 0x344525bd, 0xa08839e1, 0x51ce794b, 0x2f32c9b7, 0xa01fbac9, + 0xe01cc87e, 0xbcc7d1f6, 0xcf0111c3, 0xa1e8aac7, 0x1a908749, 0xd44fbd9a, + 0xd0dadecb, 0xd50ada38, 0x0339c32a, 0xc6913667, 0x8df9317c, 0xe0b12b4f, + 0xf79e59b7, 0x43f5bb3a, 0xf2d519ff, 0x27d9459c, 0xbf97222c, 0x15e6fc2a, + 0x0f91fc71, 0x9b941525, 0xfae59361, 0xceb69ceb, 0xc2a86459, 0x12baa8d1, + 0xb6c1075e, 0xe3056a0c, 0x10d25065, 0xcb03a442, 0xe0ec6e0e, 0x1698db3b, + 0x4c98a0be, 0x3278e964, 0x9f1f9532, 0xe0d392df, 0xd3a0342b, 0x8971f21e, + 0x1b0a7441, 0x4ba3348c, 0xc5be7120, 0xc37632d8, 0xdf359f8d, 0x9b992f2e, + 0xe60b6f47, 0x0fe3f11d, 0xe54cda54, 0x1edad891, 0xce6279cf, 0xcd3e7e6f, + 0x1618b166, 0xfd2c1d05, 0x848fd2c5, 0xf6fb2299, 0xf523f357, 0xa6327623, + 0x93a83531, 0x56cccd02, 0xacf08162, 0x5a75ebb5, 0x6e163697, 0x88d273cc, + 0xde966292, 0x81b949d0, 0x4c50901b, 0x71c65614, 0xe6c6c7bd, 0x327a140a, + 0x45e1d006, 0xc3f27b9a, 0xc9aa53fd, 0x62a80f00, 0xbb25bfe2, 0x35bdd2f6, + 0x71126905, 0xb2040222, 0xb6cbcf7c, 0xcd769c2b, 0x53113ec0, 0x1640e3d3, + 0x38abbd60, 0x2547adf0, 0xba38209c, 0xf746ce76, 0x77afa1c5, 0x20756060, + 0x85cbfe4e, 0x8ae88dd8, 0x7aaaf9b0, 0x4cf9aa7e, 0x1948c25c, 0x02fb8a8c, + 0x01c36ae4, 0xd6ebe1f9, 0x90d4f869, 0xa65cdea0, 0x3f09252d, 0xc208e69f, + 0xb74e6132, 0xce77e25b, 0x578fdfe3, 0x3ac372e6, +} + +var p = [18]uint32{ + 0x243f6a88, 0x85a308d3, 0x13198a2e, 0x03707344, 0xa4093822, 0x299f31d0, + 0x082efa98, 0xec4e6c89, 0x452821e6, 0x38d01377, 0xbe5466cf, 0x34e90c6c, + 0xc0ac29b7, 0xc97c50dd, 0x3f84d5b5, 0xb5470917, 0x9216d5d9, 0x8979fb1b, +} diff --git a/vendor/golang.org/x/crypto/codereview.cfg b/vendor/golang.org/x/crypto/codereview.cfg new file mode 100644 index 0000000..3f8b14b --- /dev/null +++ b/vendor/golang.org/x/crypto/codereview.cfg @@ -0,0 +1 @@ +issuerepo: golang/go diff --git a/vendor/golang.org/x/crypto/ed25519/ed25519.go b/vendor/golang.org/x/crypto/ed25519/ed25519.go new file mode 100644 index 0000000..9b07acc --- /dev/null +++ b/vendor/golang.org/x/crypto/ed25519/ed25519.go @@ -0,0 +1,181 @@ +// Copyright 2016 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// Package ed25519 implements the Ed25519 signature algorithm. See +// https://ed25519.cr.yp.to/. +// +// These functions are also compatible with the “Ed25519” function defined in +// https://tools.ietf.org/html/draft-irtf-cfrg-eddsa-05. +package ed25519 + +// This code is a port of the public domain, “ref10” implementation of ed25519 +// from SUPERCOP. + +import ( + "crypto" + cryptorand "crypto/rand" + "crypto/sha512" + "crypto/subtle" + "errors" + "io" + "strconv" + + "golang.org/x/crypto/ed25519/internal/edwards25519" +) + +const ( + // PublicKeySize is the size, in bytes, of public keys as used in this package. + PublicKeySize = 32 + // PrivateKeySize is the size, in bytes, of private keys as used in this package. + PrivateKeySize = 64 + // SignatureSize is the size, in bytes, of signatures generated and verified by this package. + SignatureSize = 64 +) + +// PublicKey is the type of Ed25519 public keys. +type PublicKey []byte + +// PrivateKey is the type of Ed25519 private keys. It implements crypto.Signer. +type PrivateKey []byte + +// Public returns the PublicKey corresponding to priv. +func (priv PrivateKey) Public() crypto.PublicKey { + publicKey := make([]byte, PublicKeySize) + copy(publicKey, priv[32:]) + return PublicKey(publicKey) +} + +// Sign signs the given message with priv. +// Ed25519 performs two passes over messages to be signed and therefore cannot +// handle pre-hashed messages. Thus opts.HashFunc() must return zero to +// indicate the message hasn't been hashed. This can be achieved by passing +// crypto.Hash(0) as the value for opts. +func (priv PrivateKey) Sign(rand io.Reader, message []byte, opts crypto.SignerOpts) (signature []byte, err error) { + if opts.HashFunc() != crypto.Hash(0) { + return nil, errors.New("ed25519: cannot sign hashed message") + } + + return Sign(priv, message), nil +} + +// GenerateKey generates a public/private key pair using entropy from rand. +// If rand is nil, crypto/rand.Reader will be used. +func GenerateKey(rand io.Reader) (publicKey PublicKey, privateKey PrivateKey, err error) { + if rand == nil { + rand = cryptorand.Reader + } + + privateKey = make([]byte, PrivateKeySize) + publicKey = make([]byte, PublicKeySize) + _, err = io.ReadFull(rand, privateKey[:32]) + if err != nil { + return nil, nil, err + } + + digest := sha512.Sum512(privateKey[:32]) + digest[0] &= 248 + digest[31] &= 127 + digest[31] |= 64 + + var A edwards25519.ExtendedGroupElement + var hBytes [32]byte + copy(hBytes[:], digest[:]) + edwards25519.GeScalarMultBase(&A, &hBytes) + var publicKeyBytes [32]byte + A.ToBytes(&publicKeyBytes) + + copy(privateKey[32:], publicKeyBytes[:]) + copy(publicKey, publicKeyBytes[:]) + + return publicKey, privateKey, nil +} + +// Sign signs the message with privateKey and returns a signature. It will +// panic if len(privateKey) is not PrivateKeySize. +func Sign(privateKey PrivateKey, message []byte) []byte { + if l := len(privateKey); l != PrivateKeySize { + panic("ed25519: bad private key length: " + strconv.Itoa(l)) + } + + h := sha512.New() + h.Write(privateKey[:32]) + + var digest1, messageDigest, hramDigest [64]byte + var expandedSecretKey [32]byte + h.Sum(digest1[:0]) + copy(expandedSecretKey[:], digest1[:]) + expandedSecretKey[0] &= 248 + expandedSecretKey[31] &= 63 + expandedSecretKey[31] |= 64 + + h.Reset() + h.Write(digest1[32:]) + h.Write(message) + h.Sum(messageDigest[:0]) + + var messageDigestReduced [32]byte + edwards25519.ScReduce(&messageDigestReduced, &messageDigest) + var R edwards25519.ExtendedGroupElement + edwards25519.GeScalarMultBase(&R, &messageDigestReduced) + + var encodedR [32]byte + R.ToBytes(&encodedR) + + h.Reset() + h.Write(encodedR[:]) + h.Write(privateKey[32:]) + h.Write(message) + h.Sum(hramDigest[:0]) + var hramDigestReduced [32]byte + edwards25519.ScReduce(&hramDigestReduced, &hramDigest) + + var s [32]byte + edwards25519.ScMulAdd(&s, &hramDigestReduced, &expandedSecretKey, &messageDigestReduced) + + signature := make([]byte, SignatureSize) + copy(signature[:], encodedR[:]) + copy(signature[32:], s[:]) + + return signature +} + +// Verify reports whether sig is a valid signature of message by publicKey. It +// will panic if len(publicKey) is not PublicKeySize. +func Verify(publicKey PublicKey, message, sig []byte) bool { + if l := len(publicKey); l != PublicKeySize { + panic("ed25519: bad public key length: " + strconv.Itoa(l)) + } + + if len(sig) != SignatureSize || sig[63]&224 != 0 { + return false + } + + var A edwards25519.ExtendedGroupElement + var publicKeyBytes [32]byte + copy(publicKeyBytes[:], publicKey) + if !A.FromBytes(&publicKeyBytes) { + return false + } + edwards25519.FeNeg(&A.X, &A.X) + edwards25519.FeNeg(&A.T, &A.T) + + h := sha512.New() + h.Write(sig[:32]) + h.Write(publicKey[:]) + h.Write(message) + var digest [64]byte + h.Sum(digest[:0]) + + var hReduced [32]byte + edwards25519.ScReduce(&hReduced, &digest) + + var R edwards25519.ProjectiveGroupElement + var b [32]byte + copy(b[:], sig[32:]) + edwards25519.GeDoubleScalarMultVartime(&R, &hReduced, &A, &b) + + var checkR [32]byte + R.ToBytes(&checkR) + return subtle.ConstantTimeCompare(sig[:32], checkR[:]) == 1 +} diff --git a/vendor/golang.org/x/crypto/ed25519/ed25519_test.go b/vendor/golang.org/x/crypto/ed25519/ed25519_test.go new file mode 100644 index 0000000..e272f8a --- /dev/null +++ b/vendor/golang.org/x/crypto/ed25519/ed25519_test.go @@ -0,0 +1,183 @@ +// Copyright 2016 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package ed25519 + +import ( + "bufio" + "bytes" + "compress/gzip" + "crypto" + "crypto/rand" + "encoding/hex" + "os" + "strings" + "testing" + + "golang.org/x/crypto/ed25519/internal/edwards25519" +) + +type zeroReader struct{} + +func (zeroReader) Read(buf []byte) (int, error) { + for i := range buf { + buf[i] = 0 + } + return len(buf), nil +} + +func TestUnmarshalMarshal(t *testing.T) { + pub, _, _ := GenerateKey(rand.Reader) + + var A edwards25519.ExtendedGroupElement + var pubBytes [32]byte + copy(pubBytes[:], pub) + if !A.FromBytes(&pubBytes) { + t.Fatalf("ExtendedGroupElement.FromBytes failed") + } + + var pub2 [32]byte + A.ToBytes(&pub2) + + if pubBytes != pub2 { + t.Errorf("FromBytes(%v)->ToBytes does not round-trip, got %x\n", pubBytes, pub2) + } +} + +func TestSignVerify(t *testing.T) { + var zero zeroReader + public, private, _ := GenerateKey(zero) + + message := []byte("test message") + sig := Sign(private, message) + if !Verify(public, message, sig) { + t.Errorf("valid signature rejected") + } + + wrongMessage := []byte("wrong message") + if Verify(public, wrongMessage, sig) { + t.Errorf("signature of different message accepted") + } +} + +func TestCryptoSigner(t *testing.T) { + var zero zeroReader + public, private, _ := GenerateKey(zero) + + signer := crypto.Signer(private) + + publicInterface := signer.Public() + public2, ok := publicInterface.(PublicKey) + if !ok { + t.Fatalf("expected PublicKey from Public() but got %T", publicInterface) + } + + if !bytes.Equal(public, public2) { + t.Errorf("public keys do not match: original:%x vs Public():%x", public, public2) + } + + message := []byte("message") + var noHash crypto.Hash + signature, err := signer.Sign(zero, message, noHash) + if err != nil { + t.Fatalf("error from Sign(): %s", err) + } + + if !Verify(public, message, signature) { + t.Errorf("Verify failed on signature from Sign()") + } +} + +func TestGolden(t *testing.T) { + // sign.input.gz is a selection of test cases from + // https://ed25519.cr.yp.to/python/sign.input + testDataZ, err := os.Open("testdata/sign.input.gz") + if err != nil { + t.Fatal(err) + } + defer testDataZ.Close() + testData, err := gzip.NewReader(testDataZ) + if err != nil { + t.Fatal(err) + } + defer testData.Close() + + scanner := bufio.NewScanner(testData) + lineNo := 0 + + for scanner.Scan() { + lineNo++ + + line := scanner.Text() + parts := strings.Split(line, ":") + if len(parts) != 5 { + t.Fatalf("bad number of parts on line %d", lineNo) + } + + privBytes, _ := hex.DecodeString(parts[0]) + pubKey, _ := hex.DecodeString(parts[1]) + msg, _ := hex.DecodeString(parts[2]) + sig, _ := hex.DecodeString(parts[3]) + // The signatures in the test vectors also include the message + // at the end, but we just want R and S. + sig = sig[:SignatureSize] + + if l := len(pubKey); l != PublicKeySize { + t.Fatalf("bad public key length on line %d: got %d bytes", lineNo, l) + } + + var priv [PrivateKeySize]byte + copy(priv[:], privBytes) + copy(priv[32:], pubKey) + + sig2 := Sign(priv[:], msg) + if !bytes.Equal(sig, sig2[:]) { + t.Errorf("different signature result on line %d: %x vs %x", lineNo, sig, sig2) + } + + if !Verify(pubKey, msg, sig2) { + t.Errorf("signature failed to verify on line %d", lineNo) + } + } + + if err := scanner.Err(); err != nil { + t.Fatalf("error reading test data: %s", err) + } +} + +func BenchmarkKeyGeneration(b *testing.B) { + var zero zeroReader + for i := 0; i < b.N; i++ { + if _, _, err := GenerateKey(zero); err != nil { + b.Fatal(err) + } + } +} + +func BenchmarkSigning(b *testing.B) { + var zero zeroReader + _, priv, err := GenerateKey(zero) + if err != nil { + b.Fatal(err) + } + message := []byte("Hello, world!") + b.ResetTimer() + for i := 0; i < b.N; i++ { + Sign(priv, message) + } +} + +func BenchmarkVerification(b *testing.B) { + var zero zeroReader + pub, priv, err := GenerateKey(zero) + if err != nil { + b.Fatal(err) + } + message := []byte("Hello, world!") + signature := Sign(priv, message) + b.ResetTimer() + for i := 0; i < b.N; i++ { + Verify(pub, message, signature) + } +} diff --git a/vendor/golang.org/x/crypto/ed25519/internal/edwards25519/const.go b/vendor/golang.org/x/crypto/ed25519/internal/edwards25519/const.go new file mode 100644 index 0000000..e39f086 --- /dev/null +++ b/vendor/golang.org/x/crypto/ed25519/internal/edwards25519/const.go @@ -0,0 +1,1422 @@ +// Copyright 2016 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package edwards25519 + +// These values are from the public domain, “ref10” implementation of ed25519 +// from SUPERCOP. + +// d is a constant in the Edwards curve equation. +var d = FieldElement{ + -10913610, 13857413, -15372611, 6949391, 114729, -8787816, -6275908, -3247719, -18696448, -12055116, +} + +// d2 is 2*d. +var d2 = FieldElement{ + -21827239, -5839606, -30745221, 13898782, 229458, 15978800, -12551817, -6495438, 29715968, 9444199, +} + +// SqrtM1 is the square-root of -1 in the field. +var SqrtM1 = FieldElement{ + -32595792, -7943725, 9377950, 3500415, 12389472, -272473, -25146209, -2005654, 326686, 11406482, +} + +// A is a constant in the Montgomery-form of curve25519. +var A = FieldElement{ + 486662, 0, 0, 0, 0, 0, 0, 0, 0, 0, +} + +// bi contains precomputed multiples of the base-point. See the Ed25519 paper +// for a discussion about how these values are used. +var bi = [8]PreComputedGroupElement{ + { + FieldElement{25967493, -14356035, 29566456, 3660896, -12694345, 4014787, 27544626, -11754271, -6079156, 2047605}, + FieldElement{-12545711, 934262, -2722910, 3049990, -727428, 9406986, 12720692, 5043384, 19500929, -15469378}, + FieldElement{-8738181, 4489570, 9688441, -14785194, 10184609, -12363380, 29287919, 11864899, -24514362, -4438546}, + }, + { + FieldElement{15636291, -9688557, 24204773, -7912398, 616977, -16685262, 27787600, -14772189, 28944400, -1550024}, + FieldElement{16568933, 4717097, -11556148, -1102322, 15682896, -11807043, 16354577, -11775962, 7689662, 11199574}, + FieldElement{30464156, -5976125, -11779434, -15670865, 23220365, 15915852, 7512774, 10017326, -17749093, -9920357}, + }, + { + FieldElement{10861363, 11473154, 27284546, 1981175, -30064349, 12577861, 32867885, 14515107, -15438304, 10819380}, + FieldElement{4708026, 6336745, 20377586, 9066809, -11272109, 6594696, -25653668, 12483688, -12668491, 5581306}, + FieldElement{19563160, 16186464, -29386857, 4097519, 10237984, -4348115, 28542350, 13850243, -23678021, -15815942}, + }, + { + FieldElement{5153746, 9909285, 1723747, -2777874, 30523605, 5516873, 19480852, 5230134, -23952439, -15175766}, + FieldElement{-30269007, -3463509, 7665486, 10083793, 28475525, 1649722, 20654025, 16520125, 30598449, 7715701}, + FieldElement{28881845, 14381568, 9657904, 3680757, -20181635, 7843316, -31400660, 1370708, 29794553, -1409300}, + }, + { + FieldElement{-22518993, -6692182, 14201702, -8745502, -23510406, 8844726, 18474211, -1361450, -13062696, 13821877}, + FieldElement{-6455177, -7839871, 3374702, -4740862, -27098617, -10571707, 31655028, -7212327, 18853322, -14220951}, + FieldElement{4566830, -12963868, -28974889, -12240689, -7602672, -2830569, -8514358, -10431137, 2207753, -3209784}, + }, + { + FieldElement{-25154831, -4185821, 29681144, 7868801, -6854661, -9423865, -12437364, -663000, -31111463, -16132436}, + FieldElement{25576264, -2703214, 7349804, -11814844, 16472782, 9300885, 3844789, 15725684, 171356, 6466918}, + FieldElement{23103977, 13316479, 9739013, -16149481, 817875, -15038942, 8965339, -14088058, -30714912, 16193877}, + }, + { + FieldElement{-33521811, 3180713, -2394130, 14003687, -16903474, -16270840, 17238398, 4729455, -18074513, 9256800}, + FieldElement{-25182317, -4174131, 32336398, 5036987, -21236817, 11360617, 22616405, 9761698, -19827198, 630305}, + FieldElement{-13720693, 2639453, -24237460, -7406481, 9494427, -5774029, -6554551, -15960994, -2449256, -14291300}, + }, + { + FieldElement{-3151181, -5046075, 9282714, 6866145, -31907062, -863023, -18940575, 15033784, 25105118, -7894876}, + FieldElement{-24326370, 15950226, -31801215, -14592823, -11662737, -5090925, 1573892, -2625887, 2198790, -15804619}, + FieldElement{-3099351, 10324967, -2241613, 7453183, -5446979, -2735503, -13812022, -16236442, -32461234, -12290683}, + }, +} + +// base contains precomputed multiples of the base-point. See the Ed25519 paper +// for a discussion about how these values are used. +var base = [32][8]PreComputedGroupElement{ + { + { + FieldElement{25967493, -14356035, 29566456, 3660896, -12694345, 4014787, 27544626, -11754271, -6079156, 2047605}, + FieldElement{-12545711, 934262, -2722910, 3049990, -727428, 9406986, 12720692, 5043384, 19500929, -15469378}, + FieldElement{-8738181, 4489570, 9688441, -14785194, 10184609, -12363380, 29287919, 11864899, -24514362, -4438546}, + }, + { + FieldElement{-12815894, -12976347, -21581243, 11784320, -25355658, -2750717, -11717903, -3814571, -358445, -10211303}, + FieldElement{-21703237, 6903825, 27185491, 6451973, -29577724, -9554005, -15616551, 11189268, -26829678, -5319081}, + FieldElement{26966642, 11152617, 32442495, 15396054, 14353839, -12752335, -3128826, -9541118, -15472047, -4166697}, + }, + { + FieldElement{15636291, -9688557, 24204773, -7912398, 616977, -16685262, 27787600, -14772189, 28944400, -1550024}, + FieldElement{16568933, 4717097, -11556148, -1102322, 15682896, -11807043, 16354577, -11775962, 7689662, 11199574}, + FieldElement{30464156, -5976125, -11779434, -15670865, 23220365, 15915852, 7512774, 10017326, -17749093, -9920357}, + }, + { + FieldElement{-17036878, 13921892, 10945806, -6033431, 27105052, -16084379, -28926210, 15006023, 3284568, -6276540}, + FieldElement{23599295, -8306047, -11193664, -7687416, 13236774, 10506355, 7464579, 9656445, 13059162, 10374397}, + FieldElement{7798556, 16710257, 3033922, 2874086, 28997861, 2835604, 32406664, -3839045, -641708, -101325}, + }, + { + FieldElement{10861363, 11473154, 27284546, 1981175, -30064349, 12577861, 32867885, 14515107, -15438304, 10819380}, + FieldElement{4708026, 6336745, 20377586, 9066809, -11272109, 6594696, -25653668, 12483688, -12668491, 5581306}, + FieldElement{19563160, 16186464, -29386857, 4097519, 10237984, -4348115, 28542350, 13850243, -23678021, -15815942}, + }, + { + FieldElement{-15371964, -12862754, 32573250, 4720197, -26436522, 5875511, -19188627, -15224819, -9818940, -12085777}, + FieldElement{-8549212, 109983, 15149363, 2178705, 22900618, 4543417, 3044240, -15689887, 1762328, 14866737}, + FieldElement{-18199695, -15951423, -10473290, 1707278, -17185920, 3916101, -28236412, 3959421, 27914454, 4383652}, + }, + { + FieldElement{5153746, 9909285, 1723747, -2777874, 30523605, 5516873, 19480852, 5230134, -23952439, -15175766}, + FieldElement{-30269007, -3463509, 7665486, 10083793, 28475525, 1649722, 20654025, 16520125, 30598449, 7715701}, + FieldElement{28881845, 14381568, 9657904, 3680757, -20181635, 7843316, -31400660, 1370708, 29794553, -1409300}, + }, + { + FieldElement{14499471, -2729599, -33191113, -4254652, 28494862, 14271267, 30290735, 10876454, -33154098, 2381726}, + FieldElement{-7195431, -2655363, -14730155, 462251, -27724326, 3941372, -6236617, 3696005, -32300832, 15351955}, + FieldElement{27431194, 8222322, 16448760, -3907995, -18707002, 11938355, -32961401, -2970515, 29551813, 10109425}, + }, + }, + { + { + FieldElement{-13657040, -13155431, -31283750, 11777098, 21447386, 6519384, -2378284, -1627556, 10092783, -4764171}, + FieldElement{27939166, 14210322, 4677035, 16277044, -22964462, -12398139, -32508754, 12005538, -17810127, 12803510}, + FieldElement{17228999, -15661624, -1233527, 300140, -1224870, -11714777, 30364213, -9038194, 18016357, 4397660}, + }, + { + FieldElement{-10958843, -7690207, 4776341, -14954238, 27850028, -15602212, -26619106, 14544525, -17477504, 982639}, + FieldElement{29253598, 15796703, -2863982, -9908884, 10057023, 3163536, 7332899, -4120128, -21047696, 9934963}, + FieldElement{5793303, 16271923, -24131614, -10116404, 29188560, 1206517, -14747930, 4559895, -30123922, -10897950}, + }, + { + FieldElement{-27643952, -11493006, 16282657, -11036493, 28414021, -15012264, 24191034, 4541697, -13338309, 5500568}, + FieldElement{12650548, -1497113, 9052871, 11355358, -17680037, -8400164, -17430592, 12264343, 10874051, 13524335}, + FieldElement{25556948, -3045990, 714651, 2510400, 23394682, -10415330, 33119038, 5080568, -22528059, 5376628}, + }, + { + FieldElement{-26088264, -4011052, -17013699, -3537628, -6726793, 1920897, -22321305, -9447443, 4535768, 1569007}, + FieldElement{-2255422, 14606630, -21692440, -8039818, 28430649, 8775819, -30494562, 3044290, 31848280, 12543772}, + FieldElement{-22028579, 2943893, -31857513, 6777306, 13784462, -4292203, -27377195, -2062731, 7718482, 14474653}, + }, + { + FieldElement{2385315, 2454213, -22631320, 46603, -4437935, -15680415, 656965, -7236665, 24316168, -5253567}, + FieldElement{13741529, 10911568, -33233417, -8603737, -20177830, -1033297, 33040651, -13424532, -20729456, 8321686}, + FieldElement{21060490, -2212744, 15712757, -4336099, 1639040, 10656336, 23845965, -11874838, -9984458, 608372}, + }, + { + FieldElement{-13672732, -15087586, -10889693, -7557059, -6036909, 11305547, 1123968, -6780577, 27229399, 23887}, + FieldElement{-23244140, -294205, -11744728, 14712571, -29465699, -2029617, 12797024, -6440308, -1633405, 16678954}, + FieldElement{-29500620, 4770662, -16054387, 14001338, 7830047, 9564805, -1508144, -4795045, -17169265, 4904953}, + }, + { + FieldElement{24059557, 14617003, 19037157, -15039908, 19766093, -14906429, 5169211, 16191880, 2128236, -4326833}, + FieldElement{-16981152, 4124966, -8540610, -10653797, 30336522, -14105247, -29806336, 916033, -6882542, -2986532}, + FieldElement{-22630907, 12419372, -7134229, -7473371, -16478904, 16739175, 285431, 2763829, 15736322, 4143876}, + }, + { + FieldElement{2379352, 11839345, -4110402, -5988665, 11274298, 794957, 212801, -14594663, 23527084, -16458268}, + FieldElement{33431127, -11130478, -17838966, -15626900, 8909499, 8376530, -32625340, 4087881, -15188911, -14416214}, + FieldElement{1767683, 7197987, -13205226, -2022635, -13091350, 448826, 5799055, 4357868, -4774191, -16323038}, + }, + }, + { + { + FieldElement{6721966, 13833823, -23523388, -1551314, 26354293, -11863321, 23365147, -3949732, 7390890, 2759800}, + FieldElement{4409041, 2052381, 23373853, 10530217, 7676779, -12885954, 21302353, -4264057, 1244380, -12919645}, + FieldElement{-4421239, 7169619, 4982368, -2957590, 30256825, -2777540, 14086413, 9208236, 15886429, 16489664}, + }, + { + FieldElement{1996075, 10375649, 14346367, 13311202, -6874135, -16438411, -13693198, 398369, -30606455, -712933}, + FieldElement{-25307465, 9795880, -2777414, 14878809, -33531835, 14780363, 13348553, 12076947, -30836462, 5113182}, + FieldElement{-17770784, 11797796, 31950843, 13929123, -25888302, 12288344, -30341101, -7336386, 13847711, 5387222}, + }, + { + FieldElement{-18582163, -3416217, 17824843, -2340966, 22744343, -10442611, 8763061, 3617786, -19600662, 10370991}, + FieldElement{20246567, -14369378, 22358229, -543712, 18507283, -10413996, 14554437, -8746092, 32232924, 16763880}, + FieldElement{9648505, 10094563, 26416693, 14745928, -30374318, -6472621, 11094161, 15689506, 3140038, -16510092}, + }, + { + FieldElement{-16160072, 5472695, 31895588, 4744994, 8823515, 10365685, -27224800, 9448613, -28774454, 366295}, + FieldElement{19153450, 11523972, -11096490, -6503142, -24647631, 5420647, 28344573, 8041113, 719605, 11671788}, + FieldElement{8678025, 2694440, -6808014, 2517372, 4964326, 11152271, -15432916, -15266516, 27000813, -10195553}, + }, + { + FieldElement{-15157904, 7134312, 8639287, -2814877, -7235688, 10421742, 564065, 5336097, 6750977, -14521026}, + FieldElement{11836410, -3979488, 26297894, 16080799, 23455045, 15735944, 1695823, -8819122, 8169720, 16220347}, + FieldElement{-18115838, 8653647, 17578566, -6092619, -8025777, -16012763, -11144307, -2627664, -5990708, -14166033}, + }, + { + FieldElement{-23308498, -10968312, 15213228, -10081214, -30853605, -11050004, 27884329, 2847284, 2655861, 1738395}, + FieldElement{-27537433, -14253021, -25336301, -8002780, -9370762, 8129821, 21651608, -3239336, -19087449, -11005278}, + FieldElement{1533110, 3437855, 23735889, 459276, 29970501, 11335377, 26030092, 5821408, 10478196, 8544890}, + }, + { + FieldElement{32173121, -16129311, 24896207, 3921497, 22579056, -3410854, 19270449, 12217473, 17789017, -3395995}, + FieldElement{-30552961, -2228401, -15578829, -10147201, 13243889, 517024, 15479401, -3853233, 30460520, 1052596}, + FieldElement{-11614875, 13323618, 32618793, 8175907, -15230173, 12596687, 27491595, -4612359, 3179268, -9478891}, + }, + { + FieldElement{31947069, -14366651, -4640583, -15339921, -15125977, -6039709, -14756777, -16411740, 19072640, -9511060}, + FieldElement{11685058, 11822410, 3158003, -13952594, 33402194, -4165066, 5977896, -5215017, 473099, 5040608}, + FieldElement{-20290863, 8198642, -27410132, 11602123, 1290375, -2799760, 28326862, 1721092, -19558642, -3131606}, + }, + }, + { + { + FieldElement{7881532, 10687937, 7578723, 7738378, -18951012, -2553952, 21820786, 8076149, -27868496, 11538389}, + FieldElement{-19935666, 3899861, 18283497, -6801568, -15728660, -11249211, 8754525, 7446702, -5676054, 5797016}, + FieldElement{-11295600, 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-10406836, 8317860, 12352766}, + FieldElement{18200138, -14475911, -33087759, -2696619, -23702521, -9102511, -23552096, -2287550, 20712163, 6719373}, + }, + { + FieldElement{26656208, 6075253, -7858556, 1886072, -28344043, 4262326, 11117530, -3763210, 26224235, -3297458}, + FieldElement{-17168938, -14854097, -3395676, -16369877, -19954045, 14050420, 21728352, 9493610, 18620611, -16428628}, + FieldElement{-13323321, 13325349, 11432106, 5964811, 18609221, 6062965, -5269471, -9725556, -30701573, -16479657}, + }, + { + FieldElement{-23860538, -11233159, 26961357, 1640861, -32413112, -16737940, 12248509, -5240639, 13735342, 1934062}, + FieldElement{25089769, 6742589, 17081145, -13406266, 21909293, -16067981, -15136294, -3765346, -21277997, 5473616}, + FieldElement{31883677, -7961101, 1083432, -11572403, 22828471, 13290673, -7125085, 12469656, 29111212, -5451014}, + }, + { + FieldElement{24244947, -15050407, -26262976, 2791540, -14997599, 16666678, 24367466, 6388839, -10295587, 452383}, + FieldElement{-25640782, -3417841, 5217916, 16224624, 19987036, -4082269, -24236251, -5915248, 15766062, 8407814}, + FieldElement{-20406999, 13990231, 15495425, 16395525, 5377168, 15166495, -8917023, -4388953, -8067909, 2276718}, + }, + { + FieldElement{30157918, 12924066, -17712050, 9245753, 19895028, 3368142, -23827587, 5096219, 22740376, -7303417}, + FieldElement{2041139, -14256350, 7783687, 13876377, -25946985, -13352459, 24051124, 13742383, -15637599, 13295222}, + FieldElement{33338237, -8505733, 12532113, 7977527, 9106186, -1715251, -17720195, -4612972, -4451357, -14669444}, + }, + { + FieldElement{-20045281, 5454097, -14346548, 6447146, 28862071, 1883651, -2469266, -4141880, 7770569, 9620597}, + FieldElement{23208068, 7979712, 33071466, 8149229, 1758231, -10834995, 30945528, -1694323, -33502340, -14767970}, + FieldElement{1439958, -16270480, -1079989, -793782, 4625402, 10647766, -5043801, 1220118, 30494170, -11440799}, + }, + { + FieldElement{-5037580, -13028295, -2970559, -3061767, 15640974, -6701666, -26739026, 926050, -1684339, -13333647}, + FieldElement{13908495, -3549272, 30919928, -6273825, -21521863, 7989039, 9021034, 9078865, 3353509, 4033511}, + FieldElement{-29663431, -15113610, 32259991, -344482, 24295849, -12912123, 23161163, 8839127, 27485041, 7356032}, + }, + }, + { + { + FieldElement{9661027, 705443, 11980065, -5370154, -1628543, 14661173, -6346142, 2625015, 28431036, -16771834}, + FieldElement{-23839233, -8311415, -25945511, 7480958, -17681669, -8354183, -22545972, 14150565, 15970762, 4099461}, + FieldElement{29262576, 16756590, 26350592, -8793563, 8529671, -11208050, 13617293, -9937143, 11465739, 8317062}, + }, + { + FieldElement{-25493081, -6962928, 32500200, -9419051, -23038724, -2302222, 14898637, 3848455, 20969334, -5157516}, + FieldElement{-20384450, -14347713, -18336405, 13884722, -33039454, 2842114, -21610826, -3649888, 11177095, 14989547}, + FieldElement{-24496721, -11716016, 16959896, 2278463, 12066309, 10137771, 13515641, 2581286, -28487508, 9930240}, + }, + { + FieldElement{-17751622, -2097826, 16544300, -13009300, -15914807, -14949081, 18345767, -13403753, 16291481, -5314038}, + FieldElement{-33229194, 2553288, 32678213, 9875984, 8534129, 6889387, -9676774, 6957617, 4368891, 9788741}, + FieldElement{16660756, 7281060, -10830758, 12911820, 20108584, -8101676, -21722536, -8613148, 16250552, -11111103}, + }, + { + FieldElement{-19765507, 2390526, -16551031, 14161980, 1905286, 6414907, 4689584, 10604807, -30190403, 4782747}, + FieldElement{-1354539, 14736941, -7367442, -13292886, 7710542, -14155590, -9981571, 4383045, 22546403, 437323}, + FieldElement{31665577, -12180464, -16186830, 1491339, -18368625, 3294682, 27343084, 2786261, -30633590, -14097016}, + }, + { + FieldElement{-14467279, -683715, -33374107, 7448552, 19294360, 14334329, -19690631, 2355319, -19284671, -6114373}, + FieldElement{15121312, -15796162, 6377020, -6031361, -10798111, -12957845, 18952177, 15496498, -29380133, 11754228}, + FieldElement{-2637277, -13483075, 8488727, -14303896, 12728761, -1622493, 7141596, 11724556, 22761615, -10134141}, + }, + { + FieldElement{16918416, 11729663, -18083579, 3022987, -31015732, -13339659, -28741185, -12227393, 32851222, 11717399}, + FieldElement{11166634, 7338049, -6722523, 4531520, -29468672, -7302055, 31474879, 3483633, -1193175, -4030831}, + FieldElement{-185635, 9921305, 31456609, -13536438, -12013818, 13348923, 33142652, 6546660, -19985279, -3948376}, + }, + { + FieldElement{-32460596, 11266712, -11197107, -7899103, 31703694, 3855903, -8537131, -12833048, -30772034, -15486313}, + FieldElement{-18006477, 12709068, 3991746, -6479188, -21491523, -10550425, -31135347, -16049879, 10928917, 3011958}, + FieldElement{-6957757, -15594337, 31696059, 334240, 29576716, 14796075, -30831056, -12805180, 18008031, 10258577}, + }, + { + FieldElement{-22448644, 15655569, 7018479, -4410003, -30314266, -1201591, -1853465, 1367120, 25127874, 6671743}, + FieldElement{29701166, -14373934, -10878120, 9279288, -17568, 13127210, 21382910, 11042292, 25838796, 4642684}, + FieldElement{-20430234, 14955537, -24126347, 8124619, -5369288, -5990470, 30468147, -13900640, 18423289, 4177476}, + }, + }, +} diff --git a/vendor/golang.org/x/crypto/ed25519/internal/edwards25519/edwards25519.go b/vendor/golang.org/x/crypto/ed25519/internal/edwards25519/edwards25519.go new file mode 100644 index 0000000..5f8b994 --- /dev/null +++ b/vendor/golang.org/x/crypto/ed25519/internal/edwards25519/edwards25519.go @@ -0,0 +1,1771 @@ +// Copyright 2016 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package edwards25519 + +// This code is a port of the public domain, “ref10” implementation of ed25519 +// from SUPERCOP. + +// FieldElement represents an element of the field GF(2^255 - 19). An element +// t, entries t[0]...t[9], represents the integer t[0]+2^26 t[1]+2^51 t[2]+2^77 +// t[3]+2^102 t[4]+...+2^230 t[9]. Bounds on each t[i] vary depending on +// context. +type FieldElement [10]int32 + +var zero FieldElement + +func FeZero(fe *FieldElement) { + copy(fe[:], zero[:]) +} + +func FeOne(fe *FieldElement) { + FeZero(fe) + fe[0] = 1 +} + +func FeAdd(dst, a, b *FieldElement) { + dst[0] = a[0] + b[0] + dst[1] = a[1] + b[1] + dst[2] = a[2] + b[2] + dst[3] = a[3] + b[3] + dst[4] = a[4] + b[4] + dst[5] = a[5] + b[5] + dst[6] = a[6] + b[6] + dst[7] = a[7] + b[7] + dst[8] = a[8] + b[8] + dst[9] = a[9] + b[9] +} + +func FeSub(dst, a, b *FieldElement) { + dst[0] = a[0] - b[0] + dst[1] = a[1] - b[1] + dst[2] = a[2] - b[2] + dst[3] = a[3] - b[3] + dst[4] = a[4] - b[4] + dst[5] = a[5] - b[5] + dst[6] = a[6] - b[6] + dst[7] = a[7] - b[7] + dst[8] = a[8] - b[8] + dst[9] = a[9] - b[9] +} + +func FeCopy(dst, src *FieldElement) { + copy(dst[:], src[:]) +} + +// Replace (f,g) with (g,g) if b == 1; +// replace (f,g) with (f,g) if b == 0. +// +// Preconditions: b in {0,1}. +func FeCMove(f, g *FieldElement, b int32) { + b = -b + f[0] ^= b & (f[0] ^ g[0]) + f[1] ^= b & (f[1] ^ g[1]) + f[2] ^= b & (f[2] ^ g[2]) + f[3] ^= b & (f[3] ^ g[3]) + f[4] ^= b & (f[4] ^ g[4]) + f[5] ^= b & (f[5] ^ g[5]) + f[6] ^= b & (f[6] ^ g[6]) + f[7] ^= b & (f[7] ^ g[7]) + f[8] ^= b & (f[8] ^ g[8]) + f[9] ^= b & (f[9] ^ g[9]) +} + +func load3(in []byte) int64 { + var r int64 + r = int64(in[0]) + r |= int64(in[1]) << 8 + r |= int64(in[2]) << 16 + return r +} + +func load4(in []byte) int64 { + var r int64 + r = int64(in[0]) + r |= int64(in[1]) << 8 + r |= int64(in[2]) << 16 + r |= int64(in[3]) << 24 + return r +} + +func FeFromBytes(dst *FieldElement, src *[32]byte) { + h0 := load4(src[:]) + h1 := load3(src[4:]) << 6 + h2 := load3(src[7:]) << 5 + h3 := load3(src[10:]) << 3 + h4 := load3(src[13:]) << 2 + h5 := load4(src[16:]) + h6 := load3(src[20:]) << 7 + h7 := load3(src[23:]) << 5 + h8 := load3(src[26:]) << 4 + h9 := (load3(src[29:]) & 8388607) << 2 + + FeCombine(dst, h0, h1, h2, h3, h4, h5, h6, h7, h8, h9) +} + +// FeToBytes marshals h to s. +// Preconditions: +// |h| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc. +// +// Write p=2^255-19; q=floor(h/p). +// Basic claim: q = floor(2^(-255)(h + 19 2^(-25)h9 + 2^(-1))). +// +// Proof: +// Have |h|<=p so |q|<=1 so |19^2 2^(-255) q|<1/4. +// Also have |h-2^230 h9|<2^230 so |19 2^(-255)(h-2^230 h9)|<1/4. +// +// Write y=2^(-1)-19^2 2^(-255)q-19 2^(-255)(h-2^230 h9). +// Then 0> 25 + q = (h[0] + q) >> 26 + q = (h[1] + q) >> 25 + q = (h[2] + q) >> 26 + q = (h[3] + q) >> 25 + q = (h[4] + q) >> 26 + q = (h[5] + q) >> 25 + q = (h[6] + q) >> 26 + q = (h[7] + q) >> 25 + q = (h[8] + q) >> 26 + q = (h[9] + q) >> 25 + + // Goal: Output h-(2^255-19)q, which is between 0 and 2^255-20. + h[0] += 19 * q + // Goal: Output h-2^255 q, which is between 0 and 2^255-20. + + carry[0] = h[0] >> 26 + h[1] += carry[0] + h[0] -= carry[0] << 26 + carry[1] = h[1] >> 25 + h[2] += carry[1] + h[1] -= carry[1] << 25 + carry[2] = h[2] >> 26 + h[3] += carry[2] + h[2] -= carry[2] << 26 + carry[3] = h[3] >> 25 + h[4] += carry[3] + h[3] -= carry[3] << 25 + carry[4] = h[4] >> 26 + h[5] += carry[4] + h[4] -= carry[4] << 26 + carry[5] = h[5] >> 25 + h[6] += carry[5] + h[5] -= carry[5] << 25 + carry[6] = h[6] >> 26 + h[7] += carry[6] + h[6] -= carry[6] << 26 + carry[7] = h[7] >> 25 + h[8] += carry[7] + h[7] -= carry[7] << 25 + carry[8] = h[8] >> 26 + h[9] += carry[8] + h[8] -= carry[8] << 26 + carry[9] = h[9] >> 25 + h[9] -= carry[9] << 25 + // h10 = carry9 + + // Goal: Output h[0]+...+2^255 h10-2^255 q, which is between 0 and 2^255-20. + // Have h[0]+...+2^230 h[9] between 0 and 2^255-1; + // evidently 2^255 h10-2^255 q = 0. + // Goal: Output h[0]+...+2^230 h[9]. + + s[0] = byte(h[0] >> 0) + s[1] = byte(h[0] >> 8) + s[2] = byte(h[0] >> 16) + s[3] = byte((h[0] >> 24) | (h[1] << 2)) + s[4] = byte(h[1] >> 6) + s[5] = byte(h[1] >> 14) + s[6] = byte((h[1] >> 22) | (h[2] << 3)) + s[7] = byte(h[2] >> 5) + s[8] = byte(h[2] >> 13) + s[9] = byte((h[2] >> 21) | (h[3] << 5)) + s[10] = byte(h[3] >> 3) + s[11] = byte(h[3] >> 11) + s[12] = byte((h[3] >> 19) | (h[4] << 6)) + s[13] = byte(h[4] >> 2) + s[14] = byte(h[4] >> 10) + s[15] = byte(h[4] >> 18) + s[16] = byte(h[5] >> 0) + s[17] = byte(h[5] >> 8) + s[18] = byte(h[5] >> 16) + s[19] = byte((h[5] >> 24) | (h[6] << 1)) + s[20] = byte(h[6] >> 7) + s[21] = byte(h[6] >> 15) + s[22] = byte((h[6] >> 23) | (h[7] << 3)) + s[23] = byte(h[7] >> 5) + s[24] = byte(h[7] >> 13) + s[25] = byte((h[7] >> 21) | (h[8] << 4)) + s[26] = byte(h[8] >> 4) + s[27] = byte(h[8] >> 12) + s[28] = byte((h[8] >> 20) | (h[9] << 6)) + s[29] = byte(h[9] >> 2) + s[30] = byte(h[9] >> 10) + s[31] = byte(h[9] >> 18) +} + +func FeIsNegative(f *FieldElement) byte { + var s [32]byte + FeToBytes(&s, f) + return s[0] & 1 +} + +func FeIsNonZero(f *FieldElement) int32 { + var s [32]byte + FeToBytes(&s, f) + var x uint8 + for _, b := range s { + x |= b + } + x |= x >> 4 + x |= x >> 2 + x |= x >> 1 + return int32(x & 1) +} + +// FeNeg sets h = -f +// +// Preconditions: +// |f| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc. +// +// Postconditions: +// |h| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc. +func FeNeg(h, f *FieldElement) { + h[0] = -f[0] + h[1] = -f[1] + h[2] = -f[2] + h[3] = -f[3] + h[4] = -f[4] + h[5] = -f[5] + h[6] = -f[6] + h[7] = -f[7] + h[8] = -f[8] + h[9] = -f[9] +} + +func FeCombine(h *FieldElement, h0, h1, h2, h3, h4, h5, h6, h7, h8, h9 int64) { + var c0, c1, c2, c3, c4, c5, c6, c7, c8, c9 int64 + + /* + |h0| <= (1.1*1.1*2^52*(1+19+19+19+19)+1.1*1.1*2^50*(38+38+38+38+38)) + i.e. |h0| <= 1.2*2^59; narrower ranges for h2, h4, h6, h8 + |h1| <= (1.1*1.1*2^51*(1+1+19+19+19+19+19+19+19+19)) + i.e. |h1| <= 1.5*2^58; narrower ranges for h3, h5, h7, h9 + */ + + c0 = (h0 + (1 << 25)) >> 26 + h1 += c0 + h0 -= c0 << 26 + c4 = (h4 + (1 << 25)) >> 26 + h5 += c4 + h4 -= c4 << 26 + /* |h0| <= 2^25 */ + /* |h4| <= 2^25 */ + /* |h1| <= 1.51*2^58 */ + /* |h5| <= 1.51*2^58 */ + + c1 = (h1 + (1 << 24)) >> 25 + h2 += c1 + h1 -= c1 << 25 + c5 = (h5 + (1 << 24)) >> 25 + h6 += c5 + h5 -= c5 << 25 + /* |h1| <= 2^24; from now on fits into int32 */ + /* |h5| <= 2^24; from now on fits into int32 */ + /* |h2| <= 1.21*2^59 */ + /* |h6| <= 1.21*2^59 */ + + c2 = (h2 + (1 << 25)) >> 26 + h3 += c2 + h2 -= c2 << 26 + c6 = (h6 + (1 << 25)) >> 26 + h7 += c6 + h6 -= c6 << 26 + /* |h2| <= 2^25; from now on fits into int32 unchanged */ + /* |h6| <= 2^25; from now on fits into int32 unchanged */ + /* |h3| <= 1.51*2^58 */ + /* |h7| <= 1.51*2^58 */ + + c3 = (h3 + (1 << 24)) >> 25 + h4 += c3 + h3 -= c3 << 25 + c7 = (h7 + (1 << 24)) >> 25 + h8 += c7 + h7 -= c7 << 25 + /* |h3| <= 2^24; from now on fits into int32 unchanged */ + /* |h7| <= 2^24; from now on fits into int32 unchanged */ + /* |h4| <= 1.52*2^33 */ + /* |h8| <= 1.52*2^33 */ + + c4 = (h4 + (1 << 25)) >> 26 + h5 += c4 + h4 -= c4 << 26 + c8 = (h8 + (1 << 25)) >> 26 + h9 += c8 + h8 -= c8 << 26 + /* |h4| <= 2^25; from now on fits into int32 unchanged */ + /* |h8| <= 2^25; from now on fits into int32 unchanged */ + /* |h5| <= 1.01*2^24 */ + /* |h9| <= 1.51*2^58 */ + + c9 = (h9 + (1 << 24)) >> 25 + h0 += c9 * 19 + h9 -= c9 << 25 + /* |h9| <= 2^24; from now on fits into int32 unchanged */ + /* |h0| <= 1.8*2^37 */ + + c0 = (h0 + (1 << 25)) >> 26 + h1 += c0 + h0 -= c0 << 26 + /* |h0| <= 2^25; from now on fits into int32 unchanged */ + /* |h1| <= 1.01*2^24 */ + + h[0] = int32(h0) + h[1] = int32(h1) + h[2] = int32(h2) + h[3] = int32(h3) + h[4] = int32(h4) + h[5] = int32(h5) + h[6] = int32(h6) + h[7] = int32(h7) + h[8] = int32(h8) + h[9] = int32(h9) +} + +// FeMul calculates h = f * g +// Can overlap h with f or g. +// +// Preconditions: +// |f| bounded by 1.1*2^26,1.1*2^25,1.1*2^26,1.1*2^25,etc. +// |g| bounded by 1.1*2^26,1.1*2^25,1.1*2^26,1.1*2^25,etc. +// +// Postconditions: +// |h| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc. +// +// Notes on implementation strategy: +// +// Using schoolbook multiplication. +// Karatsuba would save a little in some cost models. +// +// Most multiplications by 2 and 19 are 32-bit precomputations; +// cheaper than 64-bit postcomputations. +// +// There is one remaining multiplication by 19 in the carry chain; +// one *19 precomputation can be merged into this, +// but the resulting data flow is considerably less clean. +// +// There are 12 carries below. +// 10 of them are 2-way parallelizable and vectorizable. +// Can get away with 11 carries, but then data flow is much deeper. +// +// With tighter constraints on inputs, can squeeze carries into int32. +func FeMul(h, f, g *FieldElement) { + f0 := int64(f[0]) + f1 := int64(f[1]) + f2 := int64(f[2]) + f3 := int64(f[3]) + f4 := int64(f[4]) + f5 := int64(f[5]) + f6 := int64(f[6]) + f7 := int64(f[7]) + f8 := int64(f[8]) + f9 := int64(f[9]) + + f1_2 := int64(2 * f[1]) + f3_2 := int64(2 * f[3]) + f5_2 := int64(2 * f[5]) + f7_2 := int64(2 * f[7]) + f9_2 := int64(2 * f[9]) + + g0 := int64(g[0]) + g1 := int64(g[1]) + g2 := int64(g[2]) + g3 := int64(g[3]) + g4 := int64(g[4]) + g5 := int64(g[5]) + g6 := int64(g[6]) + g7 := int64(g[7]) + g8 := int64(g[8]) + g9 := int64(g[9]) + + g1_19 := int64(19 * g[1]) /* 1.4*2^29 */ + g2_19 := int64(19 * g[2]) /* 1.4*2^30; still ok */ + g3_19 := int64(19 * g[3]) + g4_19 := int64(19 * g[4]) + g5_19 := int64(19 * g[5]) + g6_19 := int64(19 * g[6]) + g7_19 := int64(19 * g[7]) + g8_19 := int64(19 * g[8]) + g9_19 := int64(19 * g[9]) + + h0 := f0*g0 + f1_2*g9_19 + f2*g8_19 + f3_2*g7_19 + f4*g6_19 + f5_2*g5_19 + f6*g4_19 + f7_2*g3_19 + f8*g2_19 + f9_2*g1_19 + h1 := f0*g1 + f1*g0 + f2*g9_19 + f3*g8_19 + f4*g7_19 + f5*g6_19 + f6*g5_19 + f7*g4_19 + f8*g3_19 + f9*g2_19 + h2 := f0*g2 + f1_2*g1 + f2*g0 + f3_2*g9_19 + f4*g8_19 + f5_2*g7_19 + f6*g6_19 + f7_2*g5_19 + f8*g4_19 + f9_2*g3_19 + h3 := f0*g3 + f1*g2 + f2*g1 + f3*g0 + f4*g9_19 + f5*g8_19 + f6*g7_19 + f7*g6_19 + f8*g5_19 + f9*g4_19 + h4 := f0*g4 + f1_2*g3 + f2*g2 + f3_2*g1 + f4*g0 + f5_2*g9_19 + f6*g8_19 + f7_2*g7_19 + f8*g6_19 + f9_2*g5_19 + h5 := f0*g5 + f1*g4 + f2*g3 + f3*g2 + f4*g1 + f5*g0 + f6*g9_19 + f7*g8_19 + f8*g7_19 + f9*g6_19 + h6 := f0*g6 + f1_2*g5 + f2*g4 + f3_2*g3 + f4*g2 + f5_2*g1 + f6*g0 + f7_2*g9_19 + f8*g8_19 + f9_2*g7_19 + h7 := f0*g7 + f1*g6 + f2*g5 + f3*g4 + f4*g3 + f5*g2 + f6*g1 + f7*g0 + f8*g9_19 + f9*g8_19 + h8 := f0*g8 + f1_2*g7 + f2*g6 + f3_2*g5 + f4*g4 + f5_2*g3 + f6*g2 + f7_2*g1 + f8*g0 + f9_2*g9_19 + h9 := f0*g9 + f1*g8 + f2*g7 + f3*g6 + f4*g5 + f5*g4 + f6*g3 + f7*g2 + f8*g1 + f9*g0 + + FeCombine(h, h0, h1, h2, h3, h4, h5, h6, h7, h8, h9) +} + +func feSquare(f *FieldElement) (h0, h1, h2, h3, h4, h5, h6, h7, h8, h9 int64) { + f0 := int64(f[0]) + f1 := int64(f[1]) + f2 := int64(f[2]) + f3 := int64(f[3]) + f4 := int64(f[4]) + f5 := int64(f[5]) + f6 := int64(f[6]) + f7 := int64(f[7]) + f8 := int64(f[8]) + f9 := int64(f[9]) + f0_2 := int64(2 * f[0]) + f1_2 := int64(2 * f[1]) + f2_2 := int64(2 * f[2]) + f3_2 := int64(2 * f[3]) + f4_2 := int64(2 * f[4]) + f5_2 := int64(2 * f[5]) + f6_2 := int64(2 * f[6]) + f7_2 := int64(2 * f[7]) + f5_38 := 38 * f5 // 1.31*2^30 + f6_19 := 19 * f6 // 1.31*2^30 + f7_38 := 38 * f7 // 1.31*2^30 + f8_19 := 19 * f8 // 1.31*2^30 + f9_38 := 38 * f9 // 1.31*2^30 + + h0 = f0*f0 + f1_2*f9_38 + f2_2*f8_19 + f3_2*f7_38 + f4_2*f6_19 + f5*f5_38 + h1 = f0_2*f1 + f2*f9_38 + f3_2*f8_19 + f4*f7_38 + f5_2*f6_19 + h2 = f0_2*f2 + f1_2*f1 + f3_2*f9_38 + f4_2*f8_19 + f5_2*f7_38 + f6*f6_19 + h3 = f0_2*f3 + f1_2*f2 + f4*f9_38 + f5_2*f8_19 + f6*f7_38 + h4 = f0_2*f4 + f1_2*f3_2 + f2*f2 + f5_2*f9_38 + f6_2*f8_19 + f7*f7_38 + h5 = f0_2*f5 + f1_2*f4 + f2_2*f3 + f6*f9_38 + f7_2*f8_19 + h6 = f0_2*f6 + f1_2*f5_2 + f2_2*f4 + f3_2*f3 + f7_2*f9_38 + f8*f8_19 + h7 = f0_2*f7 + f1_2*f6 + f2_2*f5 + f3_2*f4 + f8*f9_38 + h8 = f0_2*f8 + f1_2*f7_2 + f2_2*f6 + f3_2*f5_2 + f4*f4 + f9*f9_38 + h9 = f0_2*f9 + f1_2*f8 + f2_2*f7 + f3_2*f6 + f4_2*f5 + + return +} + +// FeSquare calculates h = f*f. Can overlap h with f. +// +// Preconditions: +// |f| bounded by 1.1*2^26,1.1*2^25,1.1*2^26,1.1*2^25,etc. +// +// Postconditions: +// |h| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc. +func FeSquare(h, f *FieldElement) { + h0, h1, h2, h3, h4, h5, h6, h7, h8, h9 := feSquare(f) + FeCombine(h, h0, h1, h2, h3, h4, h5, h6, h7, h8, h9) +} + +// FeSquare2 sets h = 2 * f * f +// +// Can overlap h with f. +// +// Preconditions: +// |f| bounded by 1.65*2^26,1.65*2^25,1.65*2^26,1.65*2^25,etc. +// +// Postconditions: +// |h| bounded by 1.01*2^25,1.01*2^24,1.01*2^25,1.01*2^24,etc. +// See fe_mul.c for discussion of implementation strategy. +func FeSquare2(h, f *FieldElement) { + h0, h1, h2, h3, h4, h5, h6, h7, h8, h9 := feSquare(f) + + h0 += h0 + h1 += h1 + h2 += h2 + h3 += h3 + h4 += h4 + h5 += h5 + h6 += h6 + h7 += h7 + h8 += h8 + h9 += h9 + + FeCombine(h, h0, h1, h2, h3, h4, h5, h6, h7, h8, h9) +} + +func FeInvert(out, z *FieldElement) { + var t0, t1, t2, t3 FieldElement + var i int + + FeSquare(&t0, z) // 2^1 + FeSquare(&t1, &t0) // 2^2 + for i = 1; i < 2; i++ { // 2^3 + FeSquare(&t1, &t1) + } + FeMul(&t1, z, &t1) // 2^3 + 2^0 + FeMul(&t0, &t0, &t1) // 2^3 + 2^1 + 2^0 + FeSquare(&t2, &t0) // 2^4 + 2^2 + 2^1 + FeMul(&t1, &t1, &t2) // 2^4 + 2^3 + 2^2 + 2^1 + 2^0 + FeSquare(&t2, &t1) // 5,4,3,2,1 + for i = 1; i < 5; i++ { // 9,8,7,6,5 + FeSquare(&t2, &t2) + } + FeMul(&t1, &t2, &t1) // 9,8,7,6,5,4,3,2,1,0 + FeSquare(&t2, &t1) // 10..1 + for i = 1; i < 10; i++ { // 19..10 + FeSquare(&t2, &t2) + } + FeMul(&t2, &t2, &t1) // 19..0 + FeSquare(&t3, &t2) // 20..1 + for i = 1; i < 20; i++ { // 39..20 + FeSquare(&t3, &t3) + } + FeMul(&t2, &t3, &t2) // 39..0 + FeSquare(&t2, &t2) // 40..1 + for i = 1; i < 10; i++ { // 49..10 + FeSquare(&t2, &t2) + } + FeMul(&t1, &t2, &t1) // 49..0 + FeSquare(&t2, &t1) // 50..1 + for i = 1; i < 50; i++ { // 99..50 + FeSquare(&t2, &t2) + } + FeMul(&t2, &t2, &t1) // 99..0 + FeSquare(&t3, &t2) // 100..1 + for i = 1; i < 100; i++ { // 199..100 + FeSquare(&t3, &t3) + } + FeMul(&t2, &t3, &t2) // 199..0 + FeSquare(&t2, &t2) // 200..1 + for i = 1; i < 50; i++ { // 249..50 + FeSquare(&t2, &t2) + } + FeMul(&t1, &t2, &t1) // 249..0 + FeSquare(&t1, &t1) // 250..1 + for i = 1; i < 5; i++ { // 254..5 + FeSquare(&t1, &t1) + } + FeMul(out, &t1, &t0) // 254..5,3,1,0 +} + +func fePow22523(out, z *FieldElement) { + var t0, t1, t2 FieldElement + var i int + + FeSquare(&t0, z) + for i = 1; i < 1; i++ { + FeSquare(&t0, &t0) + } + FeSquare(&t1, &t0) + for i = 1; i < 2; i++ { + FeSquare(&t1, &t1) + } + FeMul(&t1, z, &t1) + FeMul(&t0, &t0, &t1) + FeSquare(&t0, &t0) + for i = 1; i < 1; i++ { + FeSquare(&t0, &t0) + } + FeMul(&t0, &t1, &t0) + FeSquare(&t1, &t0) + for i = 1; i < 5; i++ { + FeSquare(&t1, &t1) + } + FeMul(&t0, &t1, &t0) + FeSquare(&t1, &t0) + for i = 1; i < 10; i++ { + FeSquare(&t1, &t1) + } + FeMul(&t1, &t1, &t0) + FeSquare(&t2, &t1) + for i = 1; i < 20; i++ { + FeSquare(&t2, &t2) + } + FeMul(&t1, &t2, &t1) + FeSquare(&t1, &t1) + for i = 1; i < 10; i++ { + FeSquare(&t1, &t1) + } + FeMul(&t0, &t1, &t0) + FeSquare(&t1, &t0) + for i = 1; i < 50; i++ { + FeSquare(&t1, &t1) + } + FeMul(&t1, &t1, &t0) + FeSquare(&t2, &t1) + for i = 1; i < 100; i++ { + FeSquare(&t2, &t2) + } + FeMul(&t1, &t2, &t1) + FeSquare(&t1, &t1) + for i = 1; i < 50; i++ { + FeSquare(&t1, &t1) + } + FeMul(&t0, &t1, &t0) + FeSquare(&t0, &t0) + for i = 1; i < 2; i++ { + FeSquare(&t0, &t0) + } + FeMul(out, &t0, z) +} + +// Group elements are members of the elliptic curve -x^2 + y^2 = 1 + d * x^2 * +// y^2 where d = -121665/121666. +// +// Several representations are used: +// ProjectiveGroupElement: (X:Y:Z) satisfying x=X/Z, y=Y/Z +// ExtendedGroupElement: (X:Y:Z:T) satisfying x=X/Z, y=Y/Z, XY=ZT +// CompletedGroupElement: ((X:Z),(Y:T)) satisfying x=X/Z, y=Y/T +// PreComputedGroupElement: (y+x,y-x,2dxy) + +type ProjectiveGroupElement struct { + X, Y, Z FieldElement +} + +type ExtendedGroupElement struct { + X, Y, Z, T FieldElement +} + +type CompletedGroupElement struct { + X, Y, Z, T FieldElement +} + +type PreComputedGroupElement struct { + yPlusX, yMinusX, xy2d FieldElement +} + +type CachedGroupElement struct { + yPlusX, yMinusX, Z, T2d FieldElement +} + +func (p *ProjectiveGroupElement) Zero() { + FeZero(&p.X) + FeOne(&p.Y) + FeOne(&p.Z) +} + +func (p *ProjectiveGroupElement) Double(r *CompletedGroupElement) { + var t0 FieldElement + + FeSquare(&r.X, &p.X) + FeSquare(&r.Z, &p.Y) + FeSquare2(&r.T, &p.Z) + FeAdd(&r.Y, &p.X, &p.Y) + FeSquare(&t0, &r.Y) + FeAdd(&r.Y, &r.Z, &r.X) + FeSub(&r.Z, &r.Z, &r.X) + FeSub(&r.X, &t0, &r.Y) + FeSub(&r.T, &r.T, &r.Z) +} + +func (p *ProjectiveGroupElement) ToBytes(s *[32]byte) { + var recip, x, y FieldElement + + FeInvert(&recip, &p.Z) + FeMul(&x, &p.X, &recip) + FeMul(&y, &p.Y, &recip) + FeToBytes(s, &y) + s[31] ^= FeIsNegative(&x) << 7 +} + +func (p *ExtendedGroupElement) Zero() { + FeZero(&p.X) + FeOne(&p.Y) + FeOne(&p.Z) + FeZero(&p.T) +} + +func (p *ExtendedGroupElement) Double(r *CompletedGroupElement) { + var q ProjectiveGroupElement + p.ToProjective(&q) + q.Double(r) +} + +func (p *ExtendedGroupElement) ToCached(r *CachedGroupElement) { + FeAdd(&r.yPlusX, &p.Y, &p.X) + FeSub(&r.yMinusX, &p.Y, &p.X) + FeCopy(&r.Z, &p.Z) + FeMul(&r.T2d, &p.T, &d2) +} + +func (p *ExtendedGroupElement) ToProjective(r *ProjectiveGroupElement) { + FeCopy(&r.X, &p.X) + FeCopy(&r.Y, &p.Y) + FeCopy(&r.Z, &p.Z) +} + +func (p *ExtendedGroupElement) ToBytes(s *[32]byte) { + var recip, x, y FieldElement + + FeInvert(&recip, &p.Z) + FeMul(&x, &p.X, &recip) + FeMul(&y, &p.Y, &recip) + FeToBytes(s, &y) + s[31] ^= FeIsNegative(&x) << 7 +} + +func (p *ExtendedGroupElement) FromBytes(s *[32]byte) bool { + var u, v, v3, vxx, check FieldElement + + FeFromBytes(&p.Y, s) + FeOne(&p.Z) + FeSquare(&u, &p.Y) + FeMul(&v, &u, &d) + FeSub(&u, &u, &p.Z) // y = y^2-1 + FeAdd(&v, &v, &p.Z) // v = dy^2+1 + + FeSquare(&v3, &v) + FeMul(&v3, &v3, &v) // v3 = v^3 + FeSquare(&p.X, &v3) + FeMul(&p.X, &p.X, &v) + FeMul(&p.X, &p.X, &u) // x = uv^7 + + fePow22523(&p.X, &p.X) // x = (uv^7)^((q-5)/8) + FeMul(&p.X, &p.X, &v3) + FeMul(&p.X, &p.X, &u) // x = uv^3(uv^7)^((q-5)/8) + + var tmpX, tmp2 [32]byte + + FeSquare(&vxx, &p.X) + FeMul(&vxx, &vxx, &v) + FeSub(&check, &vxx, &u) // vx^2-u + if FeIsNonZero(&check) == 1 { + FeAdd(&check, &vxx, &u) // vx^2+u + if FeIsNonZero(&check) == 1 { + return false + } + FeMul(&p.X, &p.X, &SqrtM1) + + FeToBytes(&tmpX, &p.X) + for i, v := range tmpX { + tmp2[31-i] = v + } + } + + if FeIsNegative(&p.X) != (s[31] >> 7) { + FeNeg(&p.X, &p.X) + } + + FeMul(&p.T, &p.X, &p.Y) + return true +} + +func (p *CompletedGroupElement) ToProjective(r *ProjectiveGroupElement) { + FeMul(&r.X, &p.X, &p.T) + FeMul(&r.Y, &p.Y, &p.Z) + FeMul(&r.Z, &p.Z, &p.T) +} + +func (p *CompletedGroupElement) ToExtended(r *ExtendedGroupElement) { + FeMul(&r.X, &p.X, &p.T) + FeMul(&r.Y, &p.Y, &p.Z) + FeMul(&r.Z, &p.Z, &p.T) + FeMul(&r.T, &p.X, &p.Y) +} + +func (p *PreComputedGroupElement) Zero() { + FeOne(&p.yPlusX) + FeOne(&p.yMinusX) + FeZero(&p.xy2d) +} + +func geAdd(r *CompletedGroupElement, p *ExtendedGroupElement, q *CachedGroupElement) { + var t0 FieldElement + + FeAdd(&r.X, &p.Y, &p.X) + FeSub(&r.Y, &p.Y, &p.X) + FeMul(&r.Z, &r.X, &q.yPlusX) + FeMul(&r.Y, &r.Y, &q.yMinusX) + FeMul(&r.T, &q.T2d, &p.T) + FeMul(&r.X, &p.Z, &q.Z) + FeAdd(&t0, &r.X, &r.X) + FeSub(&r.X, &r.Z, &r.Y) + FeAdd(&r.Y, &r.Z, &r.Y) + FeAdd(&r.Z, &t0, &r.T) + FeSub(&r.T, &t0, &r.T) +} + +func geSub(r *CompletedGroupElement, p *ExtendedGroupElement, q *CachedGroupElement) { + var t0 FieldElement + + FeAdd(&r.X, &p.Y, &p.X) + FeSub(&r.Y, &p.Y, &p.X) + FeMul(&r.Z, &r.X, &q.yMinusX) + FeMul(&r.Y, &r.Y, &q.yPlusX) + FeMul(&r.T, &q.T2d, &p.T) + FeMul(&r.X, &p.Z, &q.Z) + FeAdd(&t0, &r.X, &r.X) + FeSub(&r.X, &r.Z, &r.Y) + FeAdd(&r.Y, &r.Z, &r.Y) + FeSub(&r.Z, &t0, &r.T) + FeAdd(&r.T, &t0, &r.T) +} + +func geMixedAdd(r *CompletedGroupElement, p *ExtendedGroupElement, q *PreComputedGroupElement) { + var t0 FieldElement + + FeAdd(&r.X, &p.Y, &p.X) + FeSub(&r.Y, &p.Y, &p.X) + FeMul(&r.Z, &r.X, &q.yPlusX) + FeMul(&r.Y, &r.Y, &q.yMinusX) + FeMul(&r.T, &q.xy2d, &p.T) + FeAdd(&t0, &p.Z, &p.Z) + FeSub(&r.X, &r.Z, &r.Y) + FeAdd(&r.Y, &r.Z, &r.Y) + FeAdd(&r.Z, &t0, &r.T) + FeSub(&r.T, &t0, &r.T) +} + +func geMixedSub(r *CompletedGroupElement, p *ExtendedGroupElement, q *PreComputedGroupElement) { + var t0 FieldElement + + FeAdd(&r.X, &p.Y, &p.X) + FeSub(&r.Y, &p.Y, &p.X) + FeMul(&r.Z, &r.X, &q.yMinusX) + FeMul(&r.Y, &r.Y, &q.yPlusX) + FeMul(&r.T, &q.xy2d, &p.T) + FeAdd(&t0, &p.Z, &p.Z) + FeSub(&r.X, &r.Z, &r.Y) + FeAdd(&r.Y, &r.Z, &r.Y) + FeSub(&r.Z, &t0, &r.T) + FeAdd(&r.T, &t0, &r.T) +} + +func slide(r *[256]int8, a *[32]byte) { + for i := range r { + r[i] = int8(1 & (a[i>>3] >> uint(i&7))) + } + + for i := range r { + if r[i] != 0 { + for b := 1; b <= 6 && i+b < 256; b++ { + if r[i+b] != 0 { + if r[i]+(r[i+b]<= -15 { + r[i] -= r[i+b] << uint(b) + for k := i + b; k < 256; k++ { + if r[k] == 0 { + r[k] = 1 + break + } + r[k] = 0 + } + } else { + break + } + } + } + } + } +} + +// GeDoubleScalarMultVartime sets r = a*A + b*B +// where a = a[0]+256*a[1]+...+256^31 a[31]. +// and b = b[0]+256*b[1]+...+256^31 b[31]. +// B is the Ed25519 base point (x,4/5) with x positive. +func GeDoubleScalarMultVartime(r *ProjectiveGroupElement, a *[32]byte, A *ExtendedGroupElement, b *[32]byte) { + var aSlide, bSlide [256]int8 + var Ai [8]CachedGroupElement // A,3A,5A,7A,9A,11A,13A,15A + var t CompletedGroupElement + var u, A2 ExtendedGroupElement + var i int + + slide(&aSlide, a) + slide(&bSlide, b) + + A.ToCached(&Ai[0]) + A.Double(&t) + t.ToExtended(&A2) + + for i := 0; i < 7; i++ { + geAdd(&t, &A2, &Ai[i]) + t.ToExtended(&u) + u.ToCached(&Ai[i+1]) + } + + r.Zero() + + for i = 255; i >= 0; i-- { + if aSlide[i] != 0 || bSlide[i] != 0 { + break + } + } + + for ; i >= 0; i-- { + r.Double(&t) + + if aSlide[i] > 0 { + t.ToExtended(&u) + geAdd(&t, &u, &Ai[aSlide[i]/2]) + } else if aSlide[i] < 0 { + t.ToExtended(&u) + geSub(&t, &u, &Ai[(-aSlide[i])/2]) + } + + if bSlide[i] > 0 { + t.ToExtended(&u) + geMixedAdd(&t, &u, &bi[bSlide[i]/2]) + } else if bSlide[i] < 0 { + t.ToExtended(&u) + geMixedSub(&t, &u, &bi[(-bSlide[i])/2]) + } + + t.ToProjective(r) + } +} + +// equal returns 1 if b == c and 0 otherwise, assuming that b and c are +// non-negative. +func equal(b, c int32) int32 { + x := uint32(b ^ c) + x-- + return int32(x >> 31) +} + +// negative returns 1 if b < 0 and 0 otherwise. +func negative(b int32) int32 { + return (b >> 31) & 1 +} + +func PreComputedGroupElementCMove(t, u *PreComputedGroupElement, b int32) { + FeCMove(&t.yPlusX, &u.yPlusX, b) + FeCMove(&t.yMinusX, &u.yMinusX, b) + FeCMove(&t.xy2d, &u.xy2d, b) +} + +func selectPoint(t *PreComputedGroupElement, pos int32, b int32) { + var minusT PreComputedGroupElement + bNegative := negative(b) + bAbs := b - (((-bNegative) & b) << 1) + + t.Zero() + for i := int32(0); i < 8; i++ { + PreComputedGroupElementCMove(t, &base[pos][i], equal(bAbs, i+1)) + } + FeCopy(&minusT.yPlusX, &t.yMinusX) + FeCopy(&minusT.yMinusX, &t.yPlusX) + FeNeg(&minusT.xy2d, &t.xy2d) + PreComputedGroupElementCMove(t, &minusT, bNegative) +} + +// GeScalarMultBase computes h = a*B, where +// a = a[0]+256*a[1]+...+256^31 a[31] +// B is the Ed25519 base point (x,4/5) with x positive. +// +// Preconditions: +// a[31] <= 127 +func GeScalarMultBase(h *ExtendedGroupElement, a *[32]byte) { + var e [64]int8 + + for i, v := range a { + e[2*i] = int8(v & 15) + e[2*i+1] = int8((v >> 4) & 15) + } + + // each e[i] is between 0 and 15 and e[63] is between 0 and 7. + + carry := int8(0) + for i := 0; i < 63; i++ { + e[i] += carry + carry = (e[i] + 8) >> 4 + e[i] -= carry << 4 + } + e[63] += carry + // each e[i] is between -8 and 8. + + h.Zero() + var t PreComputedGroupElement + var r CompletedGroupElement + for i := int32(1); i < 64; i += 2 { + selectPoint(&t, i/2, int32(e[i])) + geMixedAdd(&r, h, &t) + r.ToExtended(h) + } + + var s ProjectiveGroupElement + + h.Double(&r) + r.ToProjective(&s) + s.Double(&r) + r.ToProjective(&s) + s.Double(&r) + r.ToProjective(&s) + s.Double(&r) + r.ToExtended(h) + + for i := int32(0); i < 64; i += 2 { + selectPoint(&t, i/2, int32(e[i])) + geMixedAdd(&r, h, &t) + r.ToExtended(h) + } +} + +// The scalars are GF(2^252 + 27742317777372353535851937790883648493). + +// Input: +// a[0]+256*a[1]+...+256^31*a[31] = a +// b[0]+256*b[1]+...+256^31*b[31] = b +// c[0]+256*c[1]+...+256^31*c[31] = c +// +// Output: +// s[0]+256*s[1]+...+256^31*s[31] = (ab+c) mod l +// where l = 2^252 + 27742317777372353535851937790883648493. +func ScMulAdd(s, a, b, c *[32]byte) { + a0 := 2097151 & load3(a[:]) + a1 := 2097151 & (load4(a[2:]) >> 5) + a2 := 2097151 & (load3(a[5:]) >> 2) + a3 := 2097151 & (load4(a[7:]) >> 7) + a4 := 2097151 & (load4(a[10:]) >> 4) + a5 := 2097151 & (load3(a[13:]) >> 1) + a6 := 2097151 & (load4(a[15:]) >> 6) + a7 := 2097151 & (load3(a[18:]) >> 3) + a8 := 2097151 & load3(a[21:]) + a9 := 2097151 & (load4(a[23:]) >> 5) + a10 := 2097151 & (load3(a[26:]) >> 2) + a11 := (load4(a[28:]) >> 7) + b0 := 2097151 & load3(b[:]) + b1 := 2097151 & (load4(b[2:]) >> 5) + b2 := 2097151 & (load3(b[5:]) >> 2) + b3 := 2097151 & (load4(b[7:]) >> 7) + b4 := 2097151 & (load4(b[10:]) >> 4) + b5 := 2097151 & (load3(b[13:]) >> 1) + b6 := 2097151 & (load4(b[15:]) >> 6) + b7 := 2097151 & (load3(b[18:]) >> 3) + b8 := 2097151 & load3(b[21:]) + b9 := 2097151 & (load4(b[23:]) >> 5) + b10 := 2097151 & (load3(b[26:]) >> 2) + b11 := (load4(b[28:]) >> 7) + c0 := 2097151 & load3(c[:]) + c1 := 2097151 & (load4(c[2:]) >> 5) + c2 := 2097151 & (load3(c[5:]) >> 2) + c3 := 2097151 & (load4(c[7:]) >> 7) + c4 := 2097151 & (load4(c[10:]) >> 4) + c5 := 2097151 & (load3(c[13:]) >> 1) + c6 := 2097151 & (load4(c[15:]) >> 6) + c7 := 2097151 & (load3(c[18:]) >> 3) + c8 := 2097151 & load3(c[21:]) + c9 := 2097151 & (load4(c[23:]) >> 5) + c10 := 2097151 & (load3(c[26:]) >> 2) + c11 := (load4(c[28:]) >> 7) + var carry [23]int64 + + s0 := c0 + a0*b0 + s1 := c1 + a0*b1 + a1*b0 + s2 := c2 + a0*b2 + a1*b1 + a2*b0 + s3 := c3 + a0*b3 + a1*b2 + a2*b1 + a3*b0 + s4 := c4 + a0*b4 + a1*b3 + a2*b2 + a3*b1 + a4*b0 + s5 := c5 + a0*b5 + a1*b4 + a2*b3 + a3*b2 + a4*b1 + a5*b0 + s6 := c6 + a0*b6 + a1*b5 + a2*b4 + a3*b3 + a4*b2 + a5*b1 + a6*b0 + s7 := c7 + a0*b7 + a1*b6 + a2*b5 + a3*b4 + a4*b3 + a5*b2 + a6*b1 + a7*b0 + s8 := c8 + a0*b8 + a1*b7 + a2*b6 + a3*b5 + a4*b4 + a5*b3 + a6*b2 + a7*b1 + a8*b0 + s9 := c9 + a0*b9 + a1*b8 + a2*b7 + a3*b6 + a4*b5 + a5*b4 + a6*b3 + a7*b2 + a8*b1 + a9*b0 + s10 := c10 + a0*b10 + a1*b9 + a2*b8 + a3*b7 + a4*b6 + a5*b5 + a6*b4 + a7*b3 + a8*b2 + a9*b1 + a10*b0 + s11 := c11 + a0*b11 + a1*b10 + a2*b9 + a3*b8 + a4*b7 + a5*b6 + a6*b5 + a7*b4 + a8*b3 + a9*b2 + a10*b1 + a11*b0 + s12 := a1*b11 + a2*b10 + a3*b9 + a4*b8 + a5*b7 + a6*b6 + a7*b5 + a8*b4 + a9*b3 + a10*b2 + a11*b1 + s13 := a2*b11 + a3*b10 + a4*b9 + a5*b8 + a6*b7 + a7*b6 + a8*b5 + a9*b4 + a10*b3 + a11*b2 + s14 := a3*b11 + a4*b10 + a5*b9 + a6*b8 + a7*b7 + a8*b6 + a9*b5 + a10*b4 + a11*b3 + s15 := a4*b11 + a5*b10 + a6*b9 + a7*b8 + a8*b7 + a9*b6 + a10*b5 + a11*b4 + s16 := a5*b11 + a6*b10 + a7*b9 + a8*b8 + a9*b7 + a10*b6 + a11*b5 + s17 := a6*b11 + a7*b10 + a8*b9 + a9*b8 + a10*b7 + a11*b6 + s18 := a7*b11 + a8*b10 + a9*b9 + a10*b8 + a11*b7 + s19 := a8*b11 + a9*b10 + a10*b9 + a11*b8 + s20 := a9*b11 + a10*b10 + a11*b9 + s21 := a10*b11 + a11*b10 + s22 := a11 * b11 + s23 := int64(0) + + carry[0] = (s0 + (1 << 20)) >> 21 + s1 += carry[0] + s0 -= carry[0] << 21 + carry[2] = (s2 + (1 << 20)) >> 21 + s3 += carry[2] + s2 -= carry[2] << 21 + carry[4] = (s4 + (1 << 20)) >> 21 + s5 += carry[4] + s4 -= carry[4] << 21 + carry[6] = (s6 + (1 << 20)) >> 21 + s7 += carry[6] + s6 -= carry[6] << 21 + carry[8] = (s8 + (1 << 20)) >> 21 + s9 += carry[8] + s8 -= carry[8] << 21 + carry[10] = (s10 + (1 << 20)) >> 21 + s11 += carry[10] + s10 -= carry[10] << 21 + carry[12] = (s12 + (1 << 20)) >> 21 + s13 += carry[12] + s12 -= carry[12] << 21 + carry[14] = (s14 + (1 << 20)) >> 21 + s15 += carry[14] + s14 -= carry[14] << 21 + carry[16] = (s16 + (1 << 20)) >> 21 + s17 += carry[16] + s16 -= carry[16] << 21 + carry[18] = (s18 + (1 << 20)) >> 21 + s19 += carry[18] + s18 -= carry[18] << 21 + carry[20] = (s20 + (1 << 20)) >> 21 + s21 += carry[20] + s20 -= carry[20] << 21 + carry[22] = (s22 + (1 << 20)) >> 21 + s23 += carry[22] + s22 -= carry[22] << 21 + + carry[1] = (s1 + (1 << 20)) >> 21 + s2 += carry[1] + s1 -= carry[1] << 21 + carry[3] = (s3 + (1 << 20)) >> 21 + s4 += carry[3] + s3 -= carry[3] << 21 + carry[5] = (s5 + (1 << 20)) >> 21 + s6 += carry[5] + s5 -= carry[5] << 21 + carry[7] = (s7 + (1 << 20)) >> 21 + s8 += carry[7] + s7 -= carry[7] << 21 + carry[9] = (s9 + (1 << 20)) >> 21 + s10 += carry[9] + s9 -= carry[9] << 21 + carry[11] = (s11 + (1 << 20)) >> 21 + s12 += carry[11] + s11 -= carry[11] << 21 + carry[13] = (s13 + (1 << 20)) >> 21 + s14 += carry[13] + s13 -= carry[13] << 21 + carry[15] = (s15 + (1 << 20)) >> 21 + s16 += carry[15] + s15 -= carry[15] << 21 + carry[17] = (s17 + (1 << 20)) >> 21 + s18 += carry[17] + s17 -= carry[17] << 21 + carry[19] = (s19 + (1 << 20)) >> 21 + s20 += carry[19] + s19 -= carry[19] << 21 + carry[21] = (s21 + (1 << 20)) >> 21 + s22 += carry[21] + s21 -= carry[21] << 21 + + s11 += s23 * 666643 + s12 += s23 * 470296 + s13 += s23 * 654183 + s14 -= s23 * 997805 + s15 += s23 * 136657 + s16 -= s23 * 683901 + s23 = 0 + + s10 += s22 * 666643 + s11 += s22 * 470296 + s12 += s22 * 654183 + s13 -= s22 * 997805 + s14 += s22 * 136657 + s15 -= s22 * 683901 + s22 = 0 + + s9 += s21 * 666643 + s10 += s21 * 470296 + s11 += s21 * 654183 + s12 -= s21 * 997805 + s13 += s21 * 136657 + s14 -= s21 * 683901 + s21 = 0 + + s8 += s20 * 666643 + s9 += s20 * 470296 + s10 += s20 * 654183 + s11 -= s20 * 997805 + s12 += s20 * 136657 + s13 -= s20 * 683901 + s20 = 0 + + s7 += s19 * 666643 + s8 += s19 * 470296 + s9 += s19 * 654183 + s10 -= s19 * 997805 + s11 += s19 * 136657 + s12 -= s19 * 683901 + s19 = 0 + + s6 += s18 * 666643 + s7 += s18 * 470296 + s8 += s18 * 654183 + s9 -= s18 * 997805 + s10 += s18 * 136657 + s11 -= s18 * 683901 + s18 = 0 + + carry[6] = (s6 + (1 << 20)) >> 21 + s7 += carry[6] + s6 -= carry[6] << 21 + carry[8] = (s8 + (1 << 20)) >> 21 + s9 += carry[8] + s8 -= carry[8] << 21 + carry[10] = (s10 + (1 << 20)) >> 21 + s11 += carry[10] + s10 -= carry[10] << 21 + carry[12] = (s12 + (1 << 20)) >> 21 + s13 += carry[12] + s12 -= carry[12] << 21 + carry[14] = (s14 + (1 << 20)) >> 21 + s15 += carry[14] + s14 -= carry[14] << 21 + carry[16] = (s16 + (1 << 20)) >> 21 + s17 += carry[16] + s16 -= carry[16] << 21 + + carry[7] = (s7 + (1 << 20)) >> 21 + s8 += carry[7] + s7 -= carry[7] << 21 + carry[9] = (s9 + (1 << 20)) >> 21 + s10 += carry[9] + s9 -= carry[9] << 21 + carry[11] = (s11 + (1 << 20)) >> 21 + s12 += carry[11] + s11 -= carry[11] << 21 + carry[13] = (s13 + (1 << 20)) >> 21 + s14 += carry[13] + s13 -= carry[13] << 21 + carry[15] = (s15 + (1 << 20)) >> 21 + s16 += carry[15] + s15 -= carry[15] << 21 + + s5 += s17 * 666643 + s6 += s17 * 470296 + s7 += s17 * 654183 + s8 -= s17 * 997805 + s9 += s17 * 136657 + s10 -= s17 * 683901 + s17 = 0 + + s4 += s16 * 666643 + s5 += s16 * 470296 + s6 += s16 * 654183 + s7 -= s16 * 997805 + s8 += s16 * 136657 + s9 -= s16 * 683901 + s16 = 0 + + s3 += s15 * 666643 + s4 += s15 * 470296 + s5 += s15 * 654183 + s6 -= s15 * 997805 + s7 += s15 * 136657 + s8 -= s15 * 683901 + s15 = 0 + + s2 += s14 * 666643 + s3 += s14 * 470296 + s4 += s14 * 654183 + s5 -= s14 * 997805 + s6 += s14 * 136657 + s7 -= s14 * 683901 + s14 = 0 + + s1 += s13 * 666643 + s2 += s13 * 470296 + s3 += s13 * 654183 + s4 -= s13 * 997805 + s5 += s13 * 136657 + s6 -= s13 * 683901 + s13 = 0 + + s0 += s12 * 666643 + s1 += s12 * 470296 + s2 += s12 * 654183 + s3 -= s12 * 997805 + s4 += s12 * 136657 + s5 -= s12 * 683901 + s12 = 0 + + carry[0] = (s0 + (1 << 20)) >> 21 + s1 += carry[0] + s0 -= carry[0] << 21 + carry[2] = (s2 + (1 << 20)) >> 21 + s3 += carry[2] + s2 -= carry[2] << 21 + carry[4] = (s4 + (1 << 20)) >> 21 + s5 += carry[4] + s4 -= carry[4] << 21 + carry[6] = (s6 + (1 << 20)) >> 21 + s7 += carry[6] + s6 -= carry[6] << 21 + carry[8] = (s8 + (1 << 20)) >> 21 + s9 += carry[8] + s8 -= carry[8] << 21 + carry[10] = (s10 + (1 << 20)) >> 21 + s11 += carry[10] + s10 -= carry[10] << 21 + + carry[1] = (s1 + (1 << 20)) >> 21 + s2 += carry[1] + s1 -= carry[1] << 21 + carry[3] = (s3 + (1 << 20)) >> 21 + s4 += carry[3] + s3 -= carry[3] << 21 + carry[5] = (s5 + (1 << 20)) >> 21 + s6 += carry[5] + s5 -= carry[5] << 21 + carry[7] = (s7 + (1 << 20)) >> 21 + s8 += carry[7] + s7 -= carry[7] << 21 + carry[9] = (s9 + (1 << 20)) >> 21 + s10 += carry[9] + s9 -= carry[9] << 21 + carry[11] = (s11 + (1 << 20)) >> 21 + s12 += carry[11] + s11 -= carry[11] << 21 + + s0 += s12 * 666643 + s1 += s12 * 470296 + s2 += s12 * 654183 + s3 -= s12 * 997805 + s4 += s12 * 136657 + s5 -= s12 * 683901 + s12 = 0 + + carry[0] = s0 >> 21 + s1 += carry[0] + s0 -= carry[0] << 21 + carry[1] = s1 >> 21 + s2 += carry[1] + s1 -= carry[1] << 21 + carry[2] = s2 >> 21 + s3 += carry[2] + s2 -= carry[2] << 21 + carry[3] = s3 >> 21 + s4 += carry[3] + s3 -= carry[3] << 21 + carry[4] = s4 >> 21 + s5 += carry[4] + s4 -= carry[4] << 21 + carry[5] = s5 >> 21 + s6 += carry[5] + s5 -= carry[5] << 21 + carry[6] = s6 >> 21 + s7 += carry[6] + s6 -= carry[6] << 21 + carry[7] = s7 >> 21 + s8 += carry[7] + s7 -= carry[7] << 21 + carry[8] = s8 >> 21 + s9 += carry[8] + s8 -= carry[8] << 21 + carry[9] = s9 >> 21 + s10 += carry[9] + s9 -= carry[9] << 21 + carry[10] = s10 >> 21 + s11 += carry[10] + s10 -= carry[10] << 21 + carry[11] = s11 >> 21 + s12 += carry[11] + s11 -= carry[11] << 21 + + s0 += s12 * 666643 + s1 += s12 * 470296 + s2 += s12 * 654183 + s3 -= s12 * 997805 + s4 += s12 * 136657 + s5 -= s12 * 683901 + s12 = 0 + + carry[0] = s0 >> 21 + s1 += carry[0] + s0 -= carry[0] << 21 + carry[1] = s1 >> 21 + s2 += carry[1] + s1 -= carry[1] << 21 + carry[2] = s2 >> 21 + s3 += carry[2] + s2 -= carry[2] << 21 + carry[3] = s3 >> 21 + s4 += carry[3] + s3 -= carry[3] << 21 + carry[4] = s4 >> 21 + s5 += carry[4] + s4 -= carry[4] << 21 + carry[5] = s5 >> 21 + s6 += carry[5] + s5 -= carry[5] << 21 + carry[6] = s6 >> 21 + s7 += carry[6] + s6 -= carry[6] << 21 + carry[7] = s7 >> 21 + s8 += carry[7] + s7 -= carry[7] << 21 + carry[8] = s8 >> 21 + s9 += carry[8] + s8 -= carry[8] << 21 + carry[9] = s9 >> 21 + s10 += carry[9] + s9 -= carry[9] << 21 + carry[10] = s10 >> 21 + s11 += carry[10] + s10 -= carry[10] << 21 + + s[0] = byte(s0 >> 0) + s[1] = byte(s0 >> 8) + s[2] = byte((s0 >> 16) | (s1 << 5)) + s[3] = byte(s1 >> 3) + s[4] = byte(s1 >> 11) + s[5] = byte((s1 >> 19) | (s2 << 2)) + s[6] = byte(s2 >> 6) + s[7] = byte((s2 >> 14) | (s3 << 7)) + s[8] = byte(s3 >> 1) + s[9] = byte(s3 >> 9) + s[10] = byte((s3 >> 17) | (s4 << 4)) + s[11] = byte(s4 >> 4) + s[12] = byte(s4 >> 12) + s[13] = byte((s4 >> 20) | (s5 << 1)) + s[14] = byte(s5 >> 7) + s[15] = byte((s5 >> 15) | (s6 << 6)) + s[16] = byte(s6 >> 2) + s[17] = byte(s6 >> 10) + s[18] = byte((s6 >> 18) | (s7 << 3)) + s[19] = byte(s7 >> 5) + s[20] = byte(s7 >> 13) + s[21] = byte(s8 >> 0) + s[22] = byte(s8 >> 8) + s[23] = byte((s8 >> 16) | (s9 << 5)) + s[24] = byte(s9 >> 3) + s[25] = byte(s9 >> 11) + s[26] = byte((s9 >> 19) | (s10 << 2)) + s[27] = byte(s10 >> 6) + s[28] = byte((s10 >> 14) | (s11 << 7)) + s[29] = byte(s11 >> 1) + s[30] = byte(s11 >> 9) + s[31] = byte(s11 >> 17) +} + +// Input: +// s[0]+256*s[1]+...+256^63*s[63] = s +// +// Output: +// s[0]+256*s[1]+...+256^31*s[31] = s mod l +// where l = 2^252 + 27742317777372353535851937790883648493. +func ScReduce(out *[32]byte, s *[64]byte) { + s0 := 2097151 & load3(s[:]) + s1 := 2097151 & (load4(s[2:]) >> 5) + s2 := 2097151 & (load3(s[5:]) >> 2) + s3 := 2097151 & (load4(s[7:]) >> 7) + s4 := 2097151 & (load4(s[10:]) >> 4) + s5 := 2097151 & (load3(s[13:]) >> 1) + s6 := 2097151 & (load4(s[15:]) >> 6) + s7 := 2097151 & (load3(s[18:]) >> 3) + s8 := 2097151 & load3(s[21:]) + s9 := 2097151 & (load4(s[23:]) >> 5) + s10 := 2097151 & (load3(s[26:]) >> 2) + s11 := 2097151 & (load4(s[28:]) >> 7) + s12 := 2097151 & (load4(s[31:]) >> 4) + s13 := 2097151 & (load3(s[34:]) >> 1) + s14 := 2097151 & (load4(s[36:]) >> 6) + s15 := 2097151 & (load3(s[39:]) >> 3) + s16 := 2097151 & load3(s[42:]) + s17 := 2097151 & (load4(s[44:]) >> 5) + s18 := 2097151 & (load3(s[47:]) >> 2) + s19 := 2097151 & (load4(s[49:]) >> 7) + s20 := 2097151 & (load4(s[52:]) >> 4) + s21 := 2097151 & (load3(s[55:]) >> 1) + s22 := 2097151 & (load4(s[57:]) >> 6) + s23 := (load4(s[60:]) >> 3) + + s11 += s23 * 666643 + s12 += s23 * 470296 + s13 += s23 * 654183 + s14 -= s23 * 997805 + s15 += s23 * 136657 + s16 -= s23 * 683901 + s23 = 0 + + s10 += s22 * 666643 + s11 += s22 * 470296 + s12 += s22 * 654183 + s13 -= s22 * 997805 + s14 += s22 * 136657 + s15 -= s22 * 683901 + s22 = 0 + + s9 += s21 * 666643 + s10 += s21 * 470296 + s11 += s21 * 654183 + s12 -= s21 * 997805 + s13 += s21 * 136657 + s14 -= s21 * 683901 + s21 = 0 + + s8 += s20 * 666643 + s9 += s20 * 470296 + s10 += s20 * 654183 + s11 -= s20 * 997805 + s12 += s20 * 136657 + s13 -= s20 * 683901 + s20 = 0 + + s7 += s19 * 666643 + s8 += s19 * 470296 + s9 += s19 * 654183 + s10 -= s19 * 997805 + s11 += s19 * 136657 + s12 -= s19 * 683901 + s19 = 0 + + s6 += s18 * 666643 + s7 += s18 * 470296 + s8 += s18 * 654183 + s9 -= s18 * 997805 + s10 += s18 * 136657 + s11 -= s18 * 683901 + s18 = 0 + + var carry [17]int64 + + carry[6] = (s6 + (1 << 20)) >> 21 + s7 += carry[6] + s6 -= carry[6] << 21 + carry[8] = (s8 + (1 << 20)) >> 21 + s9 += carry[8] + s8 -= carry[8] << 21 + carry[10] = (s10 + (1 << 20)) >> 21 + s11 += carry[10] + s10 -= carry[10] << 21 + carry[12] = (s12 + (1 << 20)) >> 21 + s13 += carry[12] + s12 -= carry[12] << 21 + carry[14] = (s14 + (1 << 20)) >> 21 + s15 += carry[14] + s14 -= carry[14] << 21 + carry[16] = (s16 + (1 << 20)) >> 21 + s17 += carry[16] + s16 -= carry[16] << 21 + + carry[7] = (s7 + (1 << 20)) >> 21 + s8 += carry[7] + s7 -= carry[7] << 21 + carry[9] = (s9 + (1 << 20)) >> 21 + s10 += carry[9] + s9 -= carry[9] << 21 + carry[11] = (s11 + (1 << 20)) >> 21 + s12 += carry[11] + s11 -= carry[11] << 21 + carry[13] = (s13 + (1 << 20)) >> 21 + s14 += carry[13] + s13 -= carry[13] << 21 + carry[15] = (s15 + (1 << 20)) >> 21 + s16 += carry[15] + s15 -= carry[15] << 21 + + s5 += s17 * 666643 + s6 += s17 * 470296 + s7 += s17 * 654183 + s8 -= s17 * 997805 + s9 += s17 * 136657 + s10 -= s17 * 683901 + s17 = 0 + + s4 += s16 * 666643 + s5 += s16 * 470296 + s6 += s16 * 654183 + s7 -= s16 * 997805 + s8 += s16 * 136657 + s9 -= s16 * 683901 + s16 = 0 + + s3 += s15 * 666643 + s4 += s15 * 470296 + s5 += s15 * 654183 + s6 -= s15 * 997805 + s7 += s15 * 136657 + s8 -= s15 * 683901 + s15 = 0 + + s2 += s14 * 666643 + s3 += s14 * 470296 + s4 += s14 * 654183 + s5 -= s14 * 997805 + s6 += s14 * 136657 + s7 -= s14 * 683901 + s14 = 0 + + s1 += s13 * 666643 + s2 += s13 * 470296 + s3 += s13 * 654183 + s4 -= s13 * 997805 + s5 += s13 * 136657 + s6 -= s13 * 683901 + s13 = 0 + + s0 += s12 * 666643 + s1 += s12 * 470296 + s2 += s12 * 654183 + s3 -= s12 * 997805 + s4 += s12 * 136657 + s5 -= s12 * 683901 + s12 = 0 + + carry[0] = (s0 + (1 << 20)) >> 21 + s1 += carry[0] + s0 -= carry[0] << 21 + carry[2] = (s2 + (1 << 20)) >> 21 + s3 += carry[2] + s2 -= carry[2] << 21 + carry[4] = (s4 + (1 << 20)) >> 21 + s5 += carry[4] + s4 -= carry[4] << 21 + carry[6] = (s6 + (1 << 20)) >> 21 + s7 += carry[6] + s6 -= carry[6] << 21 + carry[8] = (s8 + (1 << 20)) >> 21 + s9 += carry[8] + s8 -= carry[8] << 21 + carry[10] = (s10 + (1 << 20)) >> 21 + s11 += carry[10] + s10 -= carry[10] << 21 + + carry[1] = (s1 + (1 << 20)) >> 21 + s2 += carry[1] + s1 -= carry[1] << 21 + carry[3] = (s3 + (1 << 20)) >> 21 + s4 += carry[3] + s3 -= carry[3] << 21 + carry[5] = (s5 + (1 << 20)) >> 21 + s6 += carry[5] + s5 -= carry[5] << 21 + carry[7] = (s7 + (1 << 20)) >> 21 + s8 += carry[7] + s7 -= carry[7] << 21 + carry[9] = (s9 + (1 << 20)) >> 21 + s10 += carry[9] + s9 -= carry[9] << 21 + carry[11] = (s11 + (1 << 20)) >> 21 + s12 += carry[11] + s11 -= carry[11] << 21 + + s0 += s12 * 666643 + s1 += s12 * 470296 + s2 += s12 * 654183 + s3 -= s12 * 997805 + s4 += s12 * 136657 + s5 -= s12 * 683901 + s12 = 0 + + carry[0] = s0 >> 21 + s1 += carry[0] + s0 -= carry[0] << 21 + carry[1] = s1 >> 21 + s2 += carry[1] + s1 -= carry[1] << 21 + carry[2] = s2 >> 21 + s3 += carry[2] + s2 -= carry[2] << 21 + carry[3] = s3 >> 21 + s4 += carry[3] + s3 -= carry[3] << 21 + carry[4] = s4 >> 21 + s5 += carry[4] + s4 -= carry[4] << 21 + carry[5] = s5 >> 21 + s6 += carry[5] + s5 -= carry[5] << 21 + carry[6] = s6 >> 21 + s7 += carry[6] + s6 -= carry[6] << 21 + carry[7] = s7 >> 21 + s8 += carry[7] + s7 -= carry[7] << 21 + carry[8] = s8 >> 21 + s9 += carry[8] + s8 -= carry[8] << 21 + carry[9] = s9 >> 21 + s10 += carry[9] + s9 -= carry[9] << 21 + carry[10] = s10 >> 21 + s11 += carry[10] + s10 -= carry[10] << 21 + carry[11] = s11 >> 21 + s12 += carry[11] + s11 -= carry[11] << 21 + + s0 += s12 * 666643 + s1 += s12 * 470296 + s2 += s12 * 654183 + s3 -= s12 * 997805 + s4 += s12 * 136657 + s5 -= s12 * 683901 + s12 = 0 + + carry[0] = s0 >> 21 + s1 += carry[0] + s0 -= carry[0] << 21 + carry[1] = s1 >> 21 + s2 += carry[1] + s1 -= carry[1] << 21 + carry[2] = s2 >> 21 + s3 += carry[2] + s2 -= carry[2] << 21 + carry[3] = s3 >> 21 + s4 += carry[3] + s3 -= carry[3] << 21 + carry[4] = s4 >> 21 + s5 += carry[4] + s4 -= carry[4] << 21 + carry[5] = s5 >> 21 + s6 += carry[5] + s5 -= carry[5] << 21 + carry[6] = s6 >> 21 + s7 += carry[6] + s6 -= carry[6] << 21 + carry[7] = s7 >> 21 + s8 += carry[7] + s7 -= carry[7] << 21 + carry[8] = s8 >> 21 + s9 += carry[8] + s8 -= carry[8] << 21 + carry[9] = s9 >> 21 + s10 += carry[9] + s9 -= carry[9] << 21 + carry[10] = s10 >> 21 + s11 += carry[10] + s10 -= carry[10] << 21 + + out[0] = byte(s0 >> 0) + out[1] = byte(s0 >> 8) + out[2] = byte((s0 >> 16) | (s1 << 5)) + out[3] = byte(s1 >> 3) + out[4] = byte(s1 >> 11) + out[5] = byte((s1 >> 19) | (s2 << 2)) + out[6] = byte(s2 >> 6) + out[7] = byte((s2 >> 14) | (s3 << 7)) + out[8] = byte(s3 >> 1) + out[9] = byte(s3 >> 9) + out[10] = byte((s3 >> 17) | (s4 << 4)) + out[11] = byte(s4 >> 4) + out[12] = byte(s4 >> 12) + out[13] = byte((s4 >> 20) | (s5 << 1)) + out[14] = byte(s5 >> 7) + out[15] = byte((s5 >> 15) | (s6 << 6)) + out[16] = byte(s6 >> 2) + out[17] = byte(s6 >> 10) + out[18] = byte((s6 >> 18) | (s7 << 3)) + out[19] = byte(s7 >> 5) + out[20] = byte(s7 >> 13) + out[21] = byte(s8 >> 0) + out[22] = byte(s8 >> 8) + out[23] = byte((s8 >> 16) | (s9 << 5)) + out[24] = byte(s9 >> 3) + out[25] = byte(s9 >> 11) + out[26] = byte((s9 >> 19) | (s10 << 2)) + out[27] = byte(s10 >> 6) + out[28] = byte((s10 >> 14) | (s11 << 7)) + out[29] = byte(s11 >> 1) + out[30] = byte(s11 >> 9) + out[31] = byte(s11 >> 17) +} diff --git a/vendor/golang.org/x/crypto/ssh/benchmark_test.go b/vendor/golang.org/x/crypto/ssh/benchmark_test.go new file mode 100644 index 0000000..d9f7eb9 --- /dev/null +++ b/vendor/golang.org/x/crypto/ssh/benchmark_test.go @@ -0,0 +1,122 @@ +// Copyright 2013 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package ssh + +import ( + "errors" + "io" + "net" + "testing" +) + +type server struct { + *ServerConn + chans <-chan NewChannel +} + +func newServer(c net.Conn, conf *ServerConfig) (*server, error) { + sconn, chans, reqs, err := NewServerConn(c, conf) + if err != nil { + return nil, err + } + go DiscardRequests(reqs) + return &server{sconn, chans}, nil +} + +func (s *server) Accept() (NewChannel, error) { + n, ok := <-s.chans + if !ok { + return nil, io.EOF + } + return n, nil +} + +func sshPipe() (Conn, *server, error) { + c1, c2, err := netPipe() + if err != nil { + return nil, nil, err + } + + clientConf := ClientConfig{ + User: "user", + } + serverConf := ServerConfig{ + NoClientAuth: true, + } + serverConf.AddHostKey(testSigners["ecdsa"]) + done := make(chan *server, 1) + go func() { + server, err := newServer(c2, &serverConf) + if err != nil { + done <- nil + } + done <- server + }() + + client, _, reqs, err := NewClientConn(c1, "", &clientConf) + if err != nil { + return nil, nil, err + } + + server := <-done + if server == nil { + return nil, nil, errors.New("server handshake failed.") + } + go DiscardRequests(reqs) + + return client, server, nil +} + +func BenchmarkEndToEnd(b *testing.B) { + b.StopTimer() + + client, server, err := sshPipe() + if err != nil { + b.Fatalf("sshPipe: %v", err) + } + + defer client.Close() + defer server.Close() + + size := (1 << 20) + input := make([]byte, size) + output := make([]byte, size) + b.SetBytes(int64(size)) + done := make(chan int, 1) + + go func() { + newCh, err := server.Accept() + if err != nil { + b.Fatalf("Client: %v", err) + } + ch, incoming, err := newCh.Accept() + go DiscardRequests(incoming) + for i := 0; i < b.N; i++ { + if _, err := io.ReadFull(ch, output); err != nil { + b.Fatalf("ReadFull: %v", err) + } + } + ch.Close() + done <- 1 + }() + + ch, in, err := client.OpenChannel("speed", nil) + if err != nil { + b.Fatalf("OpenChannel: %v", err) + } + go DiscardRequests(in) + + b.ResetTimer() + b.StartTimer() + for i := 0; i < b.N; i++ { + if _, err := ch.Write(input); err != nil { + b.Fatalf("WriteFull: %v", err) + } + } + ch.Close() + b.StopTimer() + + <-done +} diff --git a/vendor/golang.org/x/crypto/ssh/buffer.go b/vendor/golang.org/x/crypto/ssh/buffer.go new file mode 100644 index 0000000..6931b51 --- /dev/null +++ b/vendor/golang.org/x/crypto/ssh/buffer.go @@ -0,0 +1,98 @@ +// Copyright 2012 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package ssh + +import ( + "io" + "sync" +) + +// buffer provides a linked list buffer for data exchange +// between producer and consumer. Theoretically the buffer is +// of unlimited capacity as it does no allocation of its own. +type buffer struct { + // protects concurrent access to head, tail and closed + *sync.Cond + + head *element // the buffer that will be read first + tail *element // the buffer that will be read last + + closed bool +} + +// An element represents a single link in a linked list. +type element struct { + buf []byte + next *element +} + +// newBuffer returns an empty buffer that is not closed. +func newBuffer() *buffer { + e := new(element) + b := &buffer{ + Cond: newCond(), + head: e, + tail: e, + } + return b +} + +// write makes buf available for Read to receive. +// buf must not be modified after the call to write. +func (b *buffer) write(buf []byte) { + b.Cond.L.Lock() + e := &element{buf: buf} + b.tail.next = e + b.tail = e + b.Cond.Signal() + b.Cond.L.Unlock() +} + +// eof closes the buffer. Reads from the buffer once all +// the data has been consumed will receive os.EOF. +func (b *buffer) eof() error { + b.Cond.L.Lock() + b.closed = true + b.Cond.Signal() + b.Cond.L.Unlock() + return nil +} + +// Read reads data from the internal buffer in buf. Reads will block +// if no data is available, or until the buffer is closed. +func (b *buffer) Read(buf []byte) (n int, err error) { + b.Cond.L.Lock() + defer b.Cond.L.Unlock() + + for len(buf) > 0 { + // if there is data in b.head, copy it + if len(b.head.buf) > 0 { + r := copy(buf, b.head.buf) + buf, b.head.buf = buf[r:], b.head.buf[r:] + n += r + continue + } + // if there is a next buffer, make it the head + if len(b.head.buf) == 0 && b.head != b.tail { + b.head = b.head.next + continue + } + + // if at least one byte has been copied, return + if n > 0 { + break + } + + // if nothing was read, and there is nothing outstanding + // check to see if the buffer is closed. + if b.closed { + err = io.EOF + break + } + // out of buffers, wait for producer + b.Cond.Wait() + } + return +} diff --git a/vendor/golang.org/x/crypto/ssh/buffer_test.go b/vendor/golang.org/x/crypto/ssh/buffer_test.go new file mode 100644 index 0000000..d5781cb --- /dev/null +++ b/vendor/golang.org/x/crypto/ssh/buffer_test.go @@ -0,0 +1,87 @@ +// Copyright 2011 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package ssh + +import ( + "io" + "testing" +) + +var alphabet = []byte("abcdefghijklmnopqrstuvwxyz") + +func TestBufferReadwrite(t *testing.T) { + b := newBuffer() + b.write(alphabet[:10]) + r, _ := b.Read(make([]byte, 10)) + if r != 10 { + t.Fatalf("Expected written == read == 10, written: 10, read %d", r) + } + + b = newBuffer() + b.write(alphabet[:5]) + r, _ = b.Read(make([]byte, 10)) + if r != 5 { + t.Fatalf("Expected written == read == 5, written: 5, read %d", r) + } + + b = newBuffer() + b.write(alphabet[:10]) + r, _ = b.Read(make([]byte, 5)) + if r != 5 { + t.Fatalf("Expected written == 10, read == 5, written: 10, read %d", r) + } + + b = newBuffer() + b.write(alphabet[:5]) + b.write(alphabet[5:15]) + r, _ = b.Read(make([]byte, 10)) + r2, _ := b.Read(make([]byte, 10)) + if r != 10 || r2 != 5 || 15 != r+r2 { + t.Fatal("Expected written == read == 15") + } +} + +func TestBufferClose(t *testing.T) { + b := newBuffer() + b.write(alphabet[:10]) + b.eof() + _, err := b.Read(make([]byte, 5)) + if err != nil { + t.Fatal("expected read of 5 to not return EOF") + } + b = newBuffer() + b.write(alphabet[:10]) + b.eof() + r, err := b.Read(make([]byte, 5)) + r2, err2 := b.Read(make([]byte, 10)) + if r != 5 || r2 != 5 || err != nil || err2 != nil { + t.Fatal("expected reads of 5 and 5") + } + + b = newBuffer() + b.write(alphabet[:10]) + b.eof() + r, err = b.Read(make([]byte, 5)) + r2, err2 = b.Read(make([]byte, 10)) + r3, err3 := b.Read(make([]byte, 10)) + if r != 5 || r2 != 5 || r3 != 0 || err != nil || err2 != nil || err3 != io.EOF { + t.Fatal("expected reads of 5 and 5 and 0, with EOF") + } + + b = newBuffer() + b.write(make([]byte, 5)) + b.write(make([]byte, 10)) + b.eof() + r, err = b.Read(make([]byte, 9)) + r2, err2 = b.Read(make([]byte, 3)) + r3, err3 = b.Read(make([]byte, 3)) + r4, err4 := b.Read(make([]byte, 10)) + if err != nil || err2 != nil || err3 != nil || err4 != io.EOF { + t.Fatalf("Expected EOF on forth read only, err=%v, err2=%v, err3=%v, err4=%v", err, err2, err3, err4) + } + if r != 9 || r2 != 3 || r3 != 3 || r4 != 0 { + t.Fatal("Expected written == read == 15", r, r2, r3, r4) + } +} diff --git a/vendor/golang.org/x/crypto/ssh/certs.go b/vendor/golang.org/x/crypto/ssh/certs.go new file mode 100644 index 0000000..b1f0220 --- /dev/null +++ b/vendor/golang.org/x/crypto/ssh/certs.go @@ -0,0 +1,519 @@ +// Copyright 2012 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package ssh + +import ( + "bytes" + "errors" + "fmt" + "io" + "net" + "sort" + "time" +) + +// These constants from [PROTOCOL.certkeys] represent the algorithm names +// for certificate types supported by this package. +const ( + CertAlgoRSAv01 = "ssh-rsa-cert-v01@openssh.com" + CertAlgoDSAv01 = "ssh-dss-cert-v01@openssh.com" + CertAlgoECDSA256v01 = "ecdsa-sha2-nistp256-cert-v01@openssh.com" + CertAlgoECDSA384v01 = "ecdsa-sha2-nistp384-cert-v01@openssh.com" + CertAlgoECDSA521v01 = "ecdsa-sha2-nistp521-cert-v01@openssh.com" + CertAlgoED25519v01 = "ssh-ed25519-cert-v01@openssh.com" +) + +// Certificate types distinguish between host and user +// certificates. The values can be set in the CertType field of +// Certificate. +const ( + UserCert = 1 + HostCert = 2 +) + +// Signature represents a cryptographic signature. +type Signature struct { + Format string + Blob []byte +} + +// CertTimeInfinity can be used for OpenSSHCertV01.ValidBefore to indicate that +// a certificate does not expire. +const CertTimeInfinity = 1<<64 - 1 + +// An Certificate represents an OpenSSH certificate as defined in +// [PROTOCOL.certkeys]?rev=1.8. +type Certificate struct { + Nonce []byte + Key PublicKey + Serial uint64 + CertType uint32 + KeyId string + ValidPrincipals []string + ValidAfter uint64 + ValidBefore uint64 + Permissions + Reserved []byte + SignatureKey PublicKey + Signature *Signature +} + +// genericCertData holds the key-independent part of the certificate data. +// Overall, certificates contain an nonce, public key fields and +// key-independent fields. +type genericCertData struct { + Serial uint64 + CertType uint32 + KeyId string + ValidPrincipals []byte + ValidAfter uint64 + ValidBefore uint64 + CriticalOptions []byte + Extensions []byte + Reserved []byte + SignatureKey []byte + Signature []byte +} + +func marshalStringList(namelist []string) []byte { + var to []byte + for _, name := range namelist { + s := struct{ N string }{name} + to = append(to, Marshal(&s)...) + } + return to +} + +type optionsTuple struct { + Key string + Value []byte +} + +type optionsTupleValue struct { + Value string +} + +// serialize a map of critical options or extensions +// issue #10569 - per [PROTOCOL.certkeys] and SSH implementation, +// we need two length prefixes for a non-empty string value +func marshalTuples(tups map[string]string) []byte { + keys := make([]string, 0, len(tups)) + for key := range tups { + keys = append(keys, key) + } + sort.Strings(keys) + + var ret []byte + for _, key := range keys { + s := optionsTuple{Key: key} + if value := tups[key]; len(value) > 0 { + s.Value = Marshal(&optionsTupleValue{value}) + } + ret = append(ret, Marshal(&s)...) + } + return ret +} + +// issue #10569 - per [PROTOCOL.certkeys] and SSH implementation, +// we need two length prefixes for a non-empty option value +func parseTuples(in []byte) (map[string]string, error) { + tups := map[string]string{} + var lastKey string + var haveLastKey bool + + for len(in) > 0 { + var key, val, extra []byte + var ok bool + + if key, in, ok = parseString(in); !ok { + return nil, errShortRead + } + keyStr := string(key) + // according to [PROTOCOL.certkeys], the names must be in + // lexical order. + if haveLastKey && keyStr <= lastKey { + return nil, fmt.Errorf("ssh: certificate options are not in lexical order") + } + lastKey, haveLastKey = keyStr, true + // the next field is a data field, which if non-empty has a string embedded + if val, in, ok = parseString(in); !ok { + return nil, errShortRead + } + if len(val) > 0 { + val, extra, ok = parseString(val) + if !ok { + return nil, errShortRead + } + if len(extra) > 0 { + return nil, fmt.Errorf("ssh: unexpected trailing data after certificate option value") + } + tups[keyStr] = string(val) + } else { + tups[keyStr] = "" + } + } + return tups, nil +} + +func parseCert(in []byte, privAlgo string) (*Certificate, error) { + nonce, rest, ok := parseString(in) + if !ok { + return nil, errShortRead + } + + key, rest, err := parsePubKey(rest, privAlgo) + if err != nil { + return nil, err + } + + var g genericCertData + if err := Unmarshal(rest, &g); err != nil { + return nil, err + } + + c := &Certificate{ + Nonce: nonce, + Key: key, + Serial: g.Serial, + CertType: g.CertType, + KeyId: g.KeyId, + ValidAfter: g.ValidAfter, + ValidBefore: g.ValidBefore, + } + + for principals := g.ValidPrincipals; len(principals) > 0; { + principal, rest, ok := parseString(principals) + if !ok { + return nil, errShortRead + } + c.ValidPrincipals = append(c.ValidPrincipals, string(principal)) + principals = rest + } + + c.CriticalOptions, err = parseTuples(g.CriticalOptions) + if err != nil { + return nil, err + } + c.Extensions, err = parseTuples(g.Extensions) + if err != nil { + return nil, err + } + c.Reserved = g.Reserved + k, err := ParsePublicKey(g.SignatureKey) + if err != nil { + return nil, err + } + + c.SignatureKey = k + c.Signature, rest, ok = parseSignatureBody(g.Signature) + if !ok || len(rest) > 0 { + return nil, errors.New("ssh: signature parse error") + } + + return c, nil +} + +type openSSHCertSigner struct { + pub *Certificate + signer Signer +} + +// NewCertSigner returns a Signer that signs with the given Certificate, whose +// private key is held by signer. It returns an error if the public key in cert +// doesn't match the key used by signer. +func NewCertSigner(cert *Certificate, signer Signer) (Signer, error) { + if bytes.Compare(cert.Key.Marshal(), signer.PublicKey().Marshal()) != 0 { + return nil, errors.New("ssh: signer and cert have different public key") + } + + return &openSSHCertSigner{cert, signer}, nil +} + +func (s *openSSHCertSigner) Sign(rand io.Reader, data []byte) (*Signature, error) { + return s.signer.Sign(rand, data) +} + +func (s *openSSHCertSigner) PublicKey() PublicKey { + return s.pub +} + +const sourceAddressCriticalOption = "source-address" + +// CertChecker does the work of verifying a certificate. Its methods +// can be plugged into ClientConfig.HostKeyCallback and +// ServerConfig.PublicKeyCallback. For the CertChecker to work, +// minimally, the IsAuthority callback should be set. +type CertChecker struct { + // SupportedCriticalOptions lists the CriticalOptions that the + // server application layer understands. These are only used + // for user certificates. + SupportedCriticalOptions []string + + // IsUserAuthority should return true if the key is recognized as an + // authority for the given user certificate. This allows for + // certificates to be signed by other certificates. This must be set + // if this CertChecker will be checking user certificates. + IsUserAuthority func(auth PublicKey) bool + + // IsHostAuthority should report whether the key is recognized as + // an authority for this host. This allows for certificates to be + // signed by other keys, and for those other keys to only be valid + // signers for particular hostnames. This must be set if this + // CertChecker will be checking host certificates. + IsHostAuthority func(auth PublicKey, address string) bool + + // Clock is used for verifying time stamps. If nil, time.Now + // is used. + Clock func() time.Time + + // UserKeyFallback is called when CertChecker.Authenticate encounters a + // public key that is not a certificate. It must implement validation + // of user keys or else, if nil, all such keys are rejected. + UserKeyFallback func(conn ConnMetadata, key PublicKey) (*Permissions, error) + + // HostKeyFallback is called when CertChecker.CheckHostKey encounters a + // public key that is not a certificate. It must implement host key + // validation or else, if nil, all such keys are rejected. + HostKeyFallback HostKeyCallback + + // IsRevoked is called for each certificate so that revocation checking + // can be implemented. It should return true if the given certificate + // is revoked and false otherwise. If nil, no certificates are + // considered to have been revoked. + IsRevoked func(cert *Certificate) bool +} + +// CheckHostKey checks a host key certificate. This method can be +// plugged into ClientConfig.HostKeyCallback. +func (c *CertChecker) CheckHostKey(addr string, remote net.Addr, key PublicKey) error { + cert, ok := key.(*Certificate) + if !ok { + if c.HostKeyFallback != nil { + return c.HostKeyFallback(addr, remote, key) + } + return errors.New("ssh: non-certificate host key") + } + if cert.CertType != HostCert { + return fmt.Errorf("ssh: certificate presented as a host key has type %d", cert.CertType) + } + if !c.IsHostAuthority(cert.SignatureKey, addr) { + return fmt.Errorf("ssh: no authorities for hostname: %v", addr) + } + + hostname, _, err := net.SplitHostPort(addr) + if err != nil { + return err + } + + // Pass hostname only as principal for host certificates (consistent with OpenSSH) + return c.CheckCert(hostname, cert) +} + +// Authenticate checks a user certificate. Authenticate can be used as +// a value for ServerConfig.PublicKeyCallback. +func (c *CertChecker) Authenticate(conn ConnMetadata, pubKey PublicKey) (*Permissions, error) { + cert, ok := pubKey.(*Certificate) + if !ok { + if c.UserKeyFallback != nil { + return c.UserKeyFallback(conn, pubKey) + } + return nil, errors.New("ssh: normal key pairs not accepted") + } + + if cert.CertType != UserCert { + return nil, fmt.Errorf("ssh: cert has type %d", cert.CertType) + } + if !c.IsUserAuthority(cert.SignatureKey) { + return nil, fmt.Errorf("ssh: certificate signed by unrecognized authority") + } + + if err := c.CheckCert(conn.User(), cert); err != nil { + return nil, err + } + + return &cert.Permissions, nil +} + +// CheckCert checks CriticalOptions, ValidPrincipals, revocation, timestamp and +// the signature of the certificate. +func (c *CertChecker) CheckCert(principal string, cert *Certificate) error { + if c.IsRevoked != nil && c.IsRevoked(cert) { + return fmt.Errorf("ssh: certicate serial %d revoked", cert.Serial) + } + + for opt, _ := range cert.CriticalOptions { + // sourceAddressCriticalOption will be enforced by + // serverAuthenticate + if opt == sourceAddressCriticalOption { + continue + } + + found := false + for _, supp := range c.SupportedCriticalOptions { + if supp == opt { + found = true + break + } + } + if !found { + return fmt.Errorf("ssh: unsupported critical option %q in certificate", opt) + } + } + + if len(cert.ValidPrincipals) > 0 { + // By default, certs are valid for all users/hosts. + found := false + for _, p := range cert.ValidPrincipals { + if p == principal { + found = true + break + } + } + if !found { + return fmt.Errorf("ssh: principal %q not in the set of valid principals for given certificate: %q", principal, cert.ValidPrincipals) + } + } + + clock := c.Clock + if clock == nil { + clock = time.Now + } + + unixNow := clock().Unix() + if after := int64(cert.ValidAfter); after < 0 || unixNow < int64(cert.ValidAfter) { + return fmt.Errorf("ssh: cert is not yet valid") + } + if before := int64(cert.ValidBefore); cert.ValidBefore != uint64(CertTimeInfinity) && (unixNow >= before || before < 0) { + return fmt.Errorf("ssh: cert has expired") + } + if err := cert.SignatureKey.Verify(cert.bytesForSigning(), cert.Signature); err != nil { + return fmt.Errorf("ssh: certificate signature does not verify") + } + + return nil +} + +// SignCert sets c.SignatureKey to the authority's public key and stores a +// Signature, by authority, in the certificate. +func (c *Certificate) SignCert(rand io.Reader, authority Signer) error { + c.Nonce = make([]byte, 32) + if _, err := io.ReadFull(rand, c.Nonce); err != nil { + return err + } + c.SignatureKey = authority.PublicKey() + + sig, err := authority.Sign(rand, c.bytesForSigning()) + if err != nil { + return err + } + c.Signature = sig + return nil +} + +var certAlgoNames = map[string]string{ + KeyAlgoRSA: CertAlgoRSAv01, + KeyAlgoDSA: CertAlgoDSAv01, + KeyAlgoECDSA256: CertAlgoECDSA256v01, + KeyAlgoECDSA384: CertAlgoECDSA384v01, + KeyAlgoECDSA521: CertAlgoECDSA521v01, + KeyAlgoED25519: CertAlgoED25519v01, +} + +// certToPrivAlgo returns the underlying algorithm for a certificate algorithm. +// Panics if a non-certificate algorithm is passed. +func certToPrivAlgo(algo string) string { + for privAlgo, pubAlgo := range certAlgoNames { + if pubAlgo == algo { + return privAlgo + } + } + panic("unknown cert algorithm") +} + +func (cert *Certificate) bytesForSigning() []byte { + c2 := *cert + c2.Signature = nil + out := c2.Marshal() + // Drop trailing signature length. + return out[:len(out)-4] +} + +// Marshal serializes c into OpenSSH's wire format. It is part of the +// PublicKey interface. +func (c *Certificate) Marshal() []byte { + generic := genericCertData{ + Serial: c.Serial, + CertType: c.CertType, + KeyId: c.KeyId, + ValidPrincipals: marshalStringList(c.ValidPrincipals), + ValidAfter: uint64(c.ValidAfter), + ValidBefore: uint64(c.ValidBefore), + CriticalOptions: marshalTuples(c.CriticalOptions), + Extensions: marshalTuples(c.Extensions), + Reserved: c.Reserved, + SignatureKey: c.SignatureKey.Marshal(), + } + if c.Signature != nil { + generic.Signature = Marshal(c.Signature) + } + genericBytes := Marshal(&generic) + keyBytes := c.Key.Marshal() + _, keyBytes, _ = parseString(keyBytes) + prefix := Marshal(&struct { + Name string + Nonce []byte + Key []byte `ssh:"rest"` + }{c.Type(), c.Nonce, keyBytes}) + + result := make([]byte, 0, len(prefix)+len(genericBytes)) + result = append(result, prefix...) + result = append(result, genericBytes...) + return result +} + +// Type returns the key name. It is part of the PublicKey interface. +func (c *Certificate) Type() string { + algo, ok := certAlgoNames[c.Key.Type()] + if !ok { + panic("unknown cert key type " + c.Key.Type()) + } + return algo +} + +// Verify verifies a signature against the certificate's public +// key. It is part of the PublicKey interface. +func (c *Certificate) Verify(data []byte, sig *Signature) error { + return c.Key.Verify(data, sig) +} + +func parseSignatureBody(in []byte) (out *Signature, rest []byte, ok bool) { + format, in, ok := parseString(in) + if !ok { + return + } + + out = &Signature{ + Format: string(format), + } + + if out.Blob, in, ok = parseString(in); !ok { + return + } + + return out, in, ok +} + +func parseSignature(in []byte) (out *Signature, rest []byte, ok bool) { + sigBytes, rest, ok := parseString(in) + if !ok { + return + } + + out, trailing, ok := parseSignatureBody(sigBytes) + if !ok || len(trailing) > 0 { + return nil, nil, false + } + return +} diff --git a/vendor/golang.org/x/crypto/ssh/certs_test.go b/vendor/golang.org/x/crypto/ssh/certs_test.go new file mode 100644 index 0000000..0200531 --- /dev/null +++ b/vendor/golang.org/x/crypto/ssh/certs_test.go @@ -0,0 +1,222 @@ +// Copyright 2013 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package ssh + +import ( + "bytes" + "crypto/rand" + "reflect" + "testing" + "time" +) + +// Cert generated by ssh-keygen 6.0p1 Debian-4. +// % ssh-keygen -s ca-key -I test user-key +const exampleSSHCert = `ssh-rsa-cert-v01@openssh.com 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` + +func TestParseCert(t *testing.T) { + authKeyBytes := []byte(exampleSSHCert) + + key, _, _, rest, err := ParseAuthorizedKey(authKeyBytes) + if err != nil { + t.Fatalf("ParseAuthorizedKey: %v", err) + } + if len(rest) > 0 { + t.Errorf("rest: got %q, want empty", rest) + } + + if _, ok := key.(*Certificate); !ok { + t.Fatalf("got %v (%T), want *Certificate", key, key) + } + + marshaled := MarshalAuthorizedKey(key) + // Before comparison, remove the trailing newline that + // MarshalAuthorizedKey adds. + marshaled = marshaled[:len(marshaled)-1] + if !bytes.Equal(authKeyBytes, marshaled) { + t.Errorf("marshaled certificate does not match original: got %q, want %q", marshaled, authKeyBytes) + } +} + +// Cert generated by ssh-keygen OpenSSH_6.8p1 OS X 10.10.3 +// % ssh-keygen -s ca -I testcert -O source-address=192.168.1.0/24 -O force-command=/bin/sleep user.pub +// user.pub key: ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDACh1rt2DXfV3hk6fszSQcQ/rueMId0kVD9U7nl8cfEnFxqOCrNT92g4laQIGl2mn8lsGZfTLg8ksHq3gkvgO3oo/0wHy4v32JeBOHTsN5AL4gfHNEhWeWb50ev47hnTsRIt9P4dxogeUo/hTu7j9+s9lLpEQXCvq6xocXQt0j8MV9qZBBXFLXVT3cWIkSqOdwt/5ZBg+1GSrc7WfCXVWgTk4a20uPMuJPxU4RQwZW6X3+O8Pqo8C3cW0OzZRFP6gUYUKUsTI5WntlS+LAxgw1mZNsozFGdbiOPRnEryE3SRldh9vjDR3tin1fGpA5P7+CEB/bqaXtG3V+F2OkqaMN +// Critical Options: +// force-command /bin/sleep +// source-address 192.168.1.0/24 +// Extensions: +// permit-X11-forwarding +// permit-agent-forwarding +// permit-port-forwarding +// permit-pty +// permit-user-rc +const exampleSSHCertWithOptions = `ssh-rsa-cert-v01@openssh.com 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` + +func TestParseCertWithOptions(t *testing.T) { + opts := map[string]string{ + "source-address": "192.168.1.0/24", + "force-command": "/bin/sleep", + } + exts := map[string]string{ + "permit-X11-forwarding": "", + "permit-agent-forwarding": "", + "permit-port-forwarding": "", + "permit-pty": "", + "permit-user-rc": "", + } + authKeyBytes := []byte(exampleSSHCertWithOptions) + + key, _, _, rest, err := ParseAuthorizedKey(authKeyBytes) + if err != nil { + t.Fatalf("ParseAuthorizedKey: %v", err) + } + if len(rest) > 0 { + t.Errorf("rest: got %q, want empty", rest) + } + cert, ok := key.(*Certificate) + if !ok { + t.Fatalf("got %v (%T), want *Certificate", key, key) + } + if !reflect.DeepEqual(cert.CriticalOptions, opts) { + t.Errorf("unexpected critical options - got %v, want %v", cert.CriticalOptions, opts) + } + if !reflect.DeepEqual(cert.Extensions, exts) { + t.Errorf("unexpected Extensions - got %v, want %v", cert.Extensions, exts) + } + marshaled := MarshalAuthorizedKey(key) + // Before comparison, remove the trailing newline that + // MarshalAuthorizedKey adds. + marshaled = marshaled[:len(marshaled)-1] + if !bytes.Equal(authKeyBytes, marshaled) { + t.Errorf("marshaled certificate does not match original: got %q, want %q", marshaled, authKeyBytes) + } +} + +func TestValidateCert(t *testing.T) { + key, _, _, _, err := ParseAuthorizedKey([]byte(exampleSSHCert)) + if err != nil { + t.Fatalf("ParseAuthorizedKey: %v", err) + } + validCert, ok := key.(*Certificate) + if !ok { + t.Fatalf("got %v (%T), want *Certificate", key, key) + } + checker := CertChecker{} + checker.IsUserAuthority = func(k PublicKey) bool { + return bytes.Equal(k.Marshal(), validCert.SignatureKey.Marshal()) + } + + if err := checker.CheckCert("user", validCert); err != nil { + t.Errorf("Unable to validate certificate: %v", err) + } + invalidCert := &Certificate{ + Key: testPublicKeys["rsa"], + SignatureKey: testPublicKeys["ecdsa"], + ValidBefore: CertTimeInfinity, + Signature: &Signature{}, + } + if err := checker.CheckCert("user", invalidCert); err == nil { + t.Error("Invalid cert signature passed validation") + } +} + +func TestValidateCertTime(t *testing.T) { + cert := Certificate{ + ValidPrincipals: []string{"user"}, + Key: testPublicKeys["rsa"], + ValidAfter: 50, + ValidBefore: 100, + } + + cert.SignCert(rand.Reader, testSigners["ecdsa"]) + + for ts, ok := range map[int64]bool{ + 25: false, + 50: true, + 99: true, + 100: false, + 125: false, + } { + checker := CertChecker{ + Clock: func() time.Time { return time.Unix(ts, 0) }, + } + checker.IsUserAuthority = func(k PublicKey) bool { + return bytes.Equal(k.Marshal(), + testPublicKeys["ecdsa"].Marshal()) + } + + if v := checker.CheckCert("user", &cert); (v == nil) != ok { + t.Errorf("Authenticate(%d): %v", ts, v) + } + } +} + +// TODO(hanwen): tests for +// +// host keys: +// * fallbacks + +func TestHostKeyCert(t *testing.T) { + cert := &Certificate{ + ValidPrincipals: []string{"hostname", "hostname.domain", "otherhost"}, + Key: testPublicKeys["rsa"], + ValidBefore: CertTimeInfinity, + CertType: HostCert, + } + cert.SignCert(rand.Reader, testSigners["ecdsa"]) + + checker := &CertChecker{ + IsHostAuthority: func(p PublicKey, addr string) bool { + return addr == "hostname:22" && bytes.Equal(testPublicKeys["ecdsa"].Marshal(), p.Marshal()) + }, + } + + certSigner, err := NewCertSigner(cert, testSigners["rsa"]) + if err != nil { + t.Errorf("NewCertSigner: %v", err) + } + + for _, test := range []struct { + addr string + succeed bool + }{ + {addr: "hostname:22", succeed: true}, + {addr: "otherhost:22", succeed: false}, // The certificate is valid for 'otherhost' as hostname, but we only recognize the authority of the signer for the address 'hostname:22' + {addr: "lasthost:22", succeed: false}, + } { + c1, c2, err := netPipe() + if err != nil { + t.Fatalf("netPipe: %v", err) + } + defer c1.Close() + defer c2.Close() + + errc := make(chan error) + + go func() { + conf := ServerConfig{ + NoClientAuth: true, + } + conf.AddHostKey(certSigner) + _, _, _, err := NewServerConn(c1, &conf) + errc <- err + }() + + config := &ClientConfig{ + User: "user", + HostKeyCallback: checker.CheckHostKey, + } + _, _, _, err = NewClientConn(c2, test.addr, config) + + if (err == nil) != test.succeed { + t.Fatalf("NewClientConn(%q): %v", test.addr, err) + } + + err = <-errc + if (err == nil) != test.succeed { + t.Fatalf("NewServerConn(%q): %v", test.addr, err) + } + } +} diff --git a/vendor/golang.org/x/crypto/ssh/channel.go b/vendor/golang.org/x/crypto/ssh/channel.go new file mode 100644 index 0000000..195530e --- /dev/null +++ b/vendor/golang.org/x/crypto/ssh/channel.go @@ -0,0 +1,633 @@ +// Copyright 2011 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package ssh + +import ( + "encoding/binary" + "errors" + "fmt" + "io" + "log" + "sync" +) + +const ( + minPacketLength = 9 + // channelMaxPacket contains the maximum number of bytes that will be + // sent in a single packet. As per RFC 4253, section 6.1, 32k is also + // the minimum. + channelMaxPacket = 1 << 15 + // We follow OpenSSH here. + channelWindowSize = 64 * channelMaxPacket +) + +// NewChannel represents an incoming request to a channel. It must either be +// accepted for use by calling Accept, or rejected by calling Reject. +type NewChannel interface { + // Accept accepts the channel creation request. It returns the Channel + // and a Go channel containing SSH requests. The Go channel must be + // serviced otherwise the Channel will hang. + Accept() (Channel, <-chan *Request, error) + + // Reject rejects the channel creation request. After calling + // this, no other methods on the Channel may be called. + Reject(reason RejectionReason, message string) error + + // ChannelType returns the type of the channel, as supplied by the + // client. + ChannelType() string + + // ExtraData returns the arbitrary payload for this channel, as supplied + // by the client. This data is specific to the channel type. + ExtraData() []byte +} + +// A Channel is an ordered, reliable, flow-controlled, duplex stream +// that is multiplexed over an SSH connection. +type Channel interface { + // Read reads up to len(data) bytes from the channel. + Read(data []byte) (int, error) + + // Write writes len(data) bytes to the channel. + Write(data []byte) (int, error) + + // Close signals end of channel use. No data may be sent after this + // call. + Close() error + + // CloseWrite signals the end of sending in-band + // data. Requests may still be sent, and the other side may + // still send data + CloseWrite() error + + // SendRequest sends a channel request. If wantReply is true, + // it will wait for a reply and return the result as a + // boolean, otherwise the return value will be false. Channel + // requests are out-of-band messages so they may be sent even + // if the data stream is closed or blocked by flow control. + // If the channel is closed before a reply is returned, io.EOF + // is returned. + SendRequest(name string, wantReply bool, payload []byte) (bool, error) + + // Stderr returns an io.ReadWriter that writes to this channel + // with the extended data type set to stderr. Stderr may + // safely be read and written from a different goroutine than + // Read and Write respectively. + Stderr() io.ReadWriter +} + +// Request is a request sent outside of the normal stream of +// data. Requests can either be specific to an SSH channel, or they +// can be global. +type Request struct { + Type string + WantReply bool + Payload []byte + + ch *channel + mux *mux +} + +// Reply sends a response to a request. It must be called for all requests +// where WantReply is true and is a no-op otherwise. The payload argument is +// ignored for replies to channel-specific requests. +func (r *Request) Reply(ok bool, payload []byte) error { + if !r.WantReply { + return nil + } + + if r.ch == nil { + return r.mux.ackRequest(ok, payload) + } + + return r.ch.ackRequest(ok) +} + +// RejectionReason is an enumeration used when rejecting channel creation +// requests. See RFC 4254, section 5.1. +type RejectionReason uint32 + +const ( + Prohibited RejectionReason = iota + 1 + ConnectionFailed + UnknownChannelType + ResourceShortage +) + +// String converts the rejection reason to human readable form. +func (r RejectionReason) String() string { + switch r { + case Prohibited: + return "administratively prohibited" + case ConnectionFailed: + return "connect failed" + case UnknownChannelType: + return "unknown channel type" + case ResourceShortage: + return "resource shortage" + } + return fmt.Sprintf("unknown reason %d", int(r)) +} + +func min(a uint32, b int) uint32 { + if a < uint32(b) { + return a + } + return uint32(b) +} + +type channelDirection uint8 + +const ( + channelInbound channelDirection = iota + channelOutbound +) + +// channel is an implementation of the Channel interface that works +// with the mux class. +type channel struct { + // R/O after creation + chanType string + extraData []byte + localId, remoteId uint32 + + // maxIncomingPayload and maxRemotePayload are the maximum + // payload sizes of normal and extended data packets for + // receiving and sending, respectively. The wire packet will + // be 9 or 13 bytes larger (excluding encryption overhead). + maxIncomingPayload uint32 + maxRemotePayload uint32 + + mux *mux + + // decided is set to true if an accept or reject message has been sent + // (for outbound channels) or received (for inbound channels). + decided bool + + // direction contains either channelOutbound, for channels created + // locally, or channelInbound, for channels created by the peer. + direction channelDirection + + // Pending internal channel messages. + msg chan interface{} + + // Since requests have no ID, there can be only one request + // with WantReply=true outstanding. This lock is held by a + // goroutine that has such an outgoing request pending. + sentRequestMu sync.Mutex + + incomingRequests chan *Request + + sentEOF bool + + // thread-safe data + remoteWin window + pending *buffer + extPending *buffer + + // windowMu protects myWindow, the flow-control window. + windowMu sync.Mutex + myWindow uint32 + + // writeMu serializes calls to mux.conn.writePacket() and + // protects sentClose and packetPool. This mutex must be + // different from windowMu, as writePacket can block if there + // is a key exchange pending. + writeMu sync.Mutex + sentClose bool + + // packetPool has a buffer for each extended channel ID to + // save allocations during writes. + packetPool map[uint32][]byte +} + +// writePacket sends a packet. If the packet is a channel close, it updates +// sentClose. This method takes the lock c.writeMu. +func (c *channel) writePacket(packet []byte) error { + c.writeMu.Lock() + if c.sentClose { + c.writeMu.Unlock() + return io.EOF + } + c.sentClose = (packet[0] == msgChannelClose) + err := c.mux.conn.writePacket(packet) + c.writeMu.Unlock() + return err +} + +func (c *channel) sendMessage(msg interface{}) error { + if debugMux { + log.Printf("send(%d): %#v", c.mux.chanList.offset, msg) + } + + p := Marshal(msg) + binary.BigEndian.PutUint32(p[1:], c.remoteId) + return c.writePacket(p) +} + +// WriteExtended writes data to a specific extended stream. These streams are +// used, for example, for stderr. +func (c *channel) WriteExtended(data []byte, extendedCode uint32) (n int, err error) { + if c.sentEOF { + return 0, io.EOF + } + // 1 byte message type, 4 bytes remoteId, 4 bytes data length + opCode := byte(msgChannelData) + headerLength := uint32(9) + if extendedCode > 0 { + headerLength += 4 + opCode = msgChannelExtendedData + } + + c.writeMu.Lock() + packet := c.packetPool[extendedCode] + // We don't remove the buffer from packetPool, so + // WriteExtended calls from different goroutines will be + // flagged as errors by the race detector. + c.writeMu.Unlock() + + for len(data) > 0 { + space := min(c.maxRemotePayload, len(data)) + if space, err = c.remoteWin.reserve(space); err != nil { + return n, err + } + if want := headerLength + space; uint32(cap(packet)) < want { + packet = make([]byte, want) + } else { + packet = packet[:want] + } + + todo := data[:space] + + packet[0] = opCode + binary.BigEndian.PutUint32(packet[1:], c.remoteId) + if extendedCode > 0 { + binary.BigEndian.PutUint32(packet[5:], uint32(extendedCode)) + } + binary.BigEndian.PutUint32(packet[headerLength-4:], uint32(len(todo))) + copy(packet[headerLength:], todo) + if err = c.writePacket(packet); err != nil { + return n, err + } + + n += len(todo) + data = data[len(todo):] + } + + c.writeMu.Lock() + c.packetPool[extendedCode] = packet + c.writeMu.Unlock() + + return n, err +} + +func (c *channel) handleData(packet []byte) error { + headerLen := 9 + isExtendedData := packet[0] == msgChannelExtendedData + if isExtendedData { + headerLen = 13 + } + if len(packet) < headerLen { + // malformed data packet + return parseError(packet[0]) + } + + var extended uint32 + if isExtendedData { + extended = binary.BigEndian.Uint32(packet[5:]) + } + + length := binary.BigEndian.Uint32(packet[headerLen-4 : headerLen]) + if length == 0 { + return nil + } + if length > c.maxIncomingPayload { + // TODO(hanwen): should send Disconnect? + return errors.New("ssh: incoming packet exceeds maximum payload size") + } + + data := packet[headerLen:] + if length != uint32(len(data)) { + return errors.New("ssh: wrong packet length") + } + + c.windowMu.Lock() + if c.myWindow < length { + c.windowMu.Unlock() + // TODO(hanwen): should send Disconnect with reason? + return errors.New("ssh: remote side wrote too much") + } + c.myWindow -= length + c.windowMu.Unlock() + + if extended == 1 { + c.extPending.write(data) + } else if extended > 0 { + // discard other extended data. + } else { + c.pending.write(data) + } + return nil +} + +func (c *channel) adjustWindow(n uint32) error { + c.windowMu.Lock() + // Since myWindow is managed on our side, and can never exceed + // the initial window setting, we don't worry about overflow. + c.myWindow += uint32(n) + c.windowMu.Unlock() + return c.sendMessage(windowAdjustMsg{ + AdditionalBytes: uint32(n), + }) +} + +func (c *channel) ReadExtended(data []byte, extended uint32) (n int, err error) { + switch extended { + case 1: + n, err = c.extPending.Read(data) + case 0: + n, err = c.pending.Read(data) + default: + return 0, fmt.Errorf("ssh: extended code %d unimplemented", extended) + } + + if n > 0 { + err = c.adjustWindow(uint32(n)) + // sendWindowAdjust can return io.EOF if the remote + // peer has closed the connection, however we want to + // defer forwarding io.EOF to the caller of Read until + // the buffer has been drained. + if n > 0 && err == io.EOF { + err = nil + } + } + + return n, err +} + +func (c *channel) close() { + c.pending.eof() + c.extPending.eof() + close(c.msg) + close(c.incomingRequests) + c.writeMu.Lock() + // This is not necessary for a normal channel teardown, but if + // there was another error, it is. + c.sentClose = true + c.writeMu.Unlock() + // Unblock writers. + c.remoteWin.close() +} + +// responseMessageReceived is called when a success or failure message is +// received on a channel to check that such a message is reasonable for the +// given channel. +func (c *channel) responseMessageReceived() error { + if c.direction == channelInbound { + return errors.New("ssh: channel response message received on inbound channel") + } + if c.decided { + return errors.New("ssh: duplicate response received for channel") + } + c.decided = true + return nil +} + +func (c *channel) handlePacket(packet []byte) error { + switch packet[0] { + case msgChannelData, msgChannelExtendedData: + return c.handleData(packet) + case msgChannelClose: + c.sendMessage(channelCloseMsg{PeersId: c.remoteId}) + c.mux.chanList.remove(c.localId) + c.close() + return nil + case msgChannelEOF: + // RFC 4254 is mute on how EOF affects dataExt messages but + // it is logical to signal EOF at the same time. + c.extPending.eof() + c.pending.eof() + return nil + } + + decoded, err := decode(packet) + if err != nil { + return err + } + + switch msg := decoded.(type) { + case *channelOpenFailureMsg: + if err := c.responseMessageReceived(); err != nil { + return err + } + c.mux.chanList.remove(msg.PeersId) + c.msg <- msg + case *channelOpenConfirmMsg: + if err := c.responseMessageReceived(); err != nil { + return err + } + if msg.MaxPacketSize < minPacketLength || msg.MaxPacketSize > 1<<31 { + return fmt.Errorf("ssh: invalid MaxPacketSize %d from peer", msg.MaxPacketSize) + } + c.remoteId = msg.MyId + c.maxRemotePayload = msg.MaxPacketSize + c.remoteWin.add(msg.MyWindow) + c.msg <- msg + case *windowAdjustMsg: + if !c.remoteWin.add(msg.AdditionalBytes) { + return fmt.Errorf("ssh: invalid window update for %d bytes", msg.AdditionalBytes) + } + case *channelRequestMsg: + req := Request{ + Type: msg.Request, + WantReply: msg.WantReply, + Payload: msg.RequestSpecificData, + ch: c, + } + + c.incomingRequests <- &req + default: + c.msg <- msg + } + return nil +} + +func (m *mux) newChannel(chanType string, direction channelDirection, extraData []byte) *channel { + ch := &channel{ + remoteWin: window{Cond: newCond()}, + myWindow: channelWindowSize, + pending: newBuffer(), + extPending: newBuffer(), + direction: direction, + incomingRequests: make(chan *Request, chanSize), + msg: make(chan interface{}, chanSize), + chanType: chanType, + extraData: extraData, + mux: m, + packetPool: make(map[uint32][]byte), + } + ch.localId = m.chanList.add(ch) + return ch +} + +var errUndecided = errors.New("ssh: must Accept or Reject channel") +var errDecidedAlready = errors.New("ssh: can call Accept or Reject only once") + +type extChannel struct { + code uint32 + ch *channel +} + +func (e *extChannel) Write(data []byte) (n int, err error) { + return e.ch.WriteExtended(data, e.code) +} + +func (e *extChannel) Read(data []byte) (n int, err error) { + return e.ch.ReadExtended(data, e.code) +} + +func (c *channel) Accept() (Channel, <-chan *Request, error) { + if c.decided { + return nil, nil, errDecidedAlready + } + c.maxIncomingPayload = channelMaxPacket + confirm := channelOpenConfirmMsg{ + PeersId: c.remoteId, + MyId: c.localId, + MyWindow: c.myWindow, + MaxPacketSize: c.maxIncomingPayload, + } + c.decided = true + if err := c.sendMessage(confirm); err != nil { + return nil, nil, err + } + + return c, c.incomingRequests, nil +} + +func (ch *channel) Reject(reason RejectionReason, message string) error { + if ch.decided { + return errDecidedAlready + } + reject := channelOpenFailureMsg{ + PeersId: ch.remoteId, + Reason: reason, + Message: message, + Language: "en", + } + ch.decided = true + return ch.sendMessage(reject) +} + +func (ch *channel) Read(data []byte) (int, error) { + if !ch.decided { + return 0, errUndecided + } + return ch.ReadExtended(data, 0) +} + +func (ch *channel) Write(data []byte) (int, error) { + if !ch.decided { + return 0, errUndecided + } + return ch.WriteExtended(data, 0) +} + +func (ch *channel) CloseWrite() error { + if !ch.decided { + return errUndecided + } + ch.sentEOF = true + return ch.sendMessage(channelEOFMsg{ + PeersId: ch.remoteId}) +} + +func (ch *channel) Close() error { + if !ch.decided { + return errUndecided + } + + return ch.sendMessage(channelCloseMsg{ + PeersId: ch.remoteId}) +} + +// Extended returns an io.ReadWriter that sends and receives data on the given, +// SSH extended stream. Such streams are used, for example, for stderr. +func (ch *channel) Extended(code uint32) io.ReadWriter { + if !ch.decided { + return nil + } + return &extChannel{code, ch} +} + +func (ch *channel) Stderr() io.ReadWriter { + return ch.Extended(1) +} + +func (ch *channel) SendRequest(name string, wantReply bool, payload []byte) (bool, error) { + if !ch.decided { + return false, errUndecided + } + + if wantReply { + ch.sentRequestMu.Lock() + defer ch.sentRequestMu.Unlock() + } + + msg := channelRequestMsg{ + PeersId: ch.remoteId, + Request: name, + WantReply: wantReply, + RequestSpecificData: payload, + } + + if err := ch.sendMessage(msg); err != nil { + return false, err + } + + if wantReply { + m, ok := (<-ch.msg) + if !ok { + return false, io.EOF + } + switch m.(type) { + case *channelRequestFailureMsg: + return false, nil + case *channelRequestSuccessMsg: + return true, nil + default: + return false, fmt.Errorf("ssh: unexpected response to channel request: %#v", m) + } + } + + return false, nil +} + +// ackRequest either sends an ack or nack to the channel request. +func (ch *channel) ackRequest(ok bool) error { + if !ch.decided { + return errUndecided + } + + var msg interface{} + if !ok { + msg = channelRequestFailureMsg{ + PeersId: ch.remoteId, + } + } else { + msg = channelRequestSuccessMsg{ + PeersId: ch.remoteId, + } + } + return ch.sendMessage(msg) +} + +func (ch *channel) ChannelType() string { + return ch.chanType +} + +func (ch *channel) ExtraData() []byte { + return ch.extraData +} diff --git a/vendor/golang.org/x/crypto/ssh/cipher.go b/vendor/golang.org/x/crypto/ssh/cipher.go new file mode 100644 index 0000000..22bb30c --- /dev/null +++ b/vendor/golang.org/x/crypto/ssh/cipher.go @@ -0,0 +1,629 @@ +// Copyright 2011 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package ssh + +import ( + "crypto/aes" + "crypto/cipher" + "crypto/des" + "crypto/rc4" + "crypto/subtle" + "encoding/binary" + "errors" + "fmt" + "hash" + "io" + "io/ioutil" +) + +const ( + packetSizeMultiple = 16 // TODO(huin) this should be determined by the cipher. + + // RFC 4253 section 6.1 defines a minimum packet size of 32768 that implementations + // MUST be able to process (plus a few more kilobytes for padding and mac). The RFC + // indicates implementations SHOULD be able to handle larger packet sizes, but then + // waffles on about reasonable limits. + // + // OpenSSH caps their maxPacket at 256kB so we choose to do + // the same. maxPacket is also used to ensure that uint32 + // length fields do not overflow, so it should remain well + // below 4G. + maxPacket = 256 * 1024 +) + +// noneCipher implements cipher.Stream and provides no encryption. It is used +// by the transport before the first key-exchange. +type noneCipher struct{} + +func (c noneCipher) XORKeyStream(dst, src []byte) { + copy(dst, src) +} + +func newAESCTR(key, iv []byte) (cipher.Stream, error) { + c, err := aes.NewCipher(key) + if err != nil { + return nil, err + } + return cipher.NewCTR(c, iv), nil +} + +func newRC4(key, iv []byte) (cipher.Stream, error) { + return rc4.NewCipher(key) +} + +type streamCipherMode struct { + keySize int + ivSize int + skip int + createFunc func(key, iv []byte) (cipher.Stream, error) +} + +func (c *streamCipherMode) createStream(key, iv []byte) (cipher.Stream, error) { + if len(key) < c.keySize { + panic("ssh: key length too small for cipher") + } + if len(iv) < c.ivSize { + panic("ssh: iv too small for cipher") + } + + stream, err := c.createFunc(key[:c.keySize], iv[:c.ivSize]) + if err != nil { + return nil, err + } + + var streamDump []byte + if c.skip > 0 { + streamDump = make([]byte, 512) + } + + for remainingToDump := c.skip; remainingToDump > 0; { + dumpThisTime := remainingToDump + if dumpThisTime > len(streamDump) { + dumpThisTime = len(streamDump) + } + stream.XORKeyStream(streamDump[:dumpThisTime], streamDump[:dumpThisTime]) + remainingToDump -= dumpThisTime + } + + return stream, nil +} + +// cipherModes documents properties of supported ciphers. Ciphers not included +// are not supported and will not be negotiated, even if explicitly requested in +// ClientConfig.Crypto.Ciphers. +var cipherModes = map[string]*streamCipherMode{ + // Ciphers from RFC4344, which introduced many CTR-based ciphers. Algorithms + // are defined in the order specified in the RFC. + "aes128-ctr": {16, aes.BlockSize, 0, newAESCTR}, + "aes192-ctr": {24, aes.BlockSize, 0, newAESCTR}, + "aes256-ctr": {32, aes.BlockSize, 0, newAESCTR}, + + // Ciphers from RFC4345, which introduces security-improved arcfour ciphers. + // They are defined in the order specified in the RFC. + "arcfour128": {16, 0, 1536, newRC4}, + "arcfour256": {32, 0, 1536, newRC4}, + + // Cipher defined in RFC 4253, which describes SSH Transport Layer Protocol. + // Note that this cipher is not safe, as stated in RFC 4253: "Arcfour (and + // RC4) has problems with weak keys, and should be used with caution." + // RFC4345 introduces improved versions of Arcfour. + "arcfour": {16, 0, 0, newRC4}, + + // AES-GCM is not a stream cipher, so it is constructed with a + // special case. If we add any more non-stream ciphers, we + // should invest a cleaner way to do this. + gcmCipherID: {16, 12, 0, nil}, + + // CBC mode is insecure and so is not included in the default config. + // (See http://www.isg.rhul.ac.uk/~kp/SandPfinal.pdf). If absolutely + // needed, it's possible to specify a custom Config to enable it. + // You should expect that an active attacker can recover plaintext if + // you do. + aes128cbcID: {16, aes.BlockSize, 0, nil}, + + // 3des-cbc is insecure and is disabled by default. + tripledescbcID: {24, des.BlockSize, 0, nil}, +} + +// prefixLen is the length of the packet prefix that contains the packet length +// and number of padding bytes. +const prefixLen = 5 + +// streamPacketCipher is a packetCipher using a stream cipher. +type streamPacketCipher struct { + mac hash.Hash + cipher cipher.Stream + etm bool + + // The following members are to avoid per-packet allocations. + prefix [prefixLen]byte + seqNumBytes [4]byte + padding [2 * packetSizeMultiple]byte + packetData []byte + macResult []byte +} + +// readPacket reads and decrypt a single packet from the reader argument. +func (s *streamPacketCipher) readPacket(seqNum uint32, r io.Reader) ([]byte, error) { + if _, err := io.ReadFull(r, s.prefix[:]); err != nil { + return nil, err + } + + var encryptedPaddingLength [1]byte + if s.mac != nil && s.etm { + copy(encryptedPaddingLength[:], s.prefix[4:5]) + s.cipher.XORKeyStream(s.prefix[4:5], s.prefix[4:5]) + } else { + s.cipher.XORKeyStream(s.prefix[:], s.prefix[:]) + } + + length := binary.BigEndian.Uint32(s.prefix[0:4]) + paddingLength := uint32(s.prefix[4]) + + var macSize uint32 + if s.mac != nil { + s.mac.Reset() + binary.BigEndian.PutUint32(s.seqNumBytes[:], seqNum) + s.mac.Write(s.seqNumBytes[:]) + if s.etm { + s.mac.Write(s.prefix[:4]) + s.mac.Write(encryptedPaddingLength[:]) + } else { + s.mac.Write(s.prefix[:]) + } + macSize = uint32(s.mac.Size()) + } + + if length <= paddingLength+1 { + return nil, errors.New("ssh: invalid packet length, packet too small") + } + + if length > maxPacket { + return nil, errors.New("ssh: invalid packet length, packet too large") + } + + // the maxPacket check above ensures that length-1+macSize + // does not overflow. + if uint32(cap(s.packetData)) < length-1+macSize { + s.packetData = make([]byte, length-1+macSize) + } else { + s.packetData = s.packetData[:length-1+macSize] + } + + if _, err := io.ReadFull(r, s.packetData); err != nil { + return nil, err + } + mac := s.packetData[length-1:] + data := s.packetData[:length-1] + + if s.mac != nil && s.etm { + s.mac.Write(data) + } + + s.cipher.XORKeyStream(data, data) + + if s.mac != nil { + if !s.etm { + s.mac.Write(data) + } + s.macResult = s.mac.Sum(s.macResult[:0]) + if subtle.ConstantTimeCompare(s.macResult, mac) != 1 { + return nil, errors.New("ssh: MAC failure") + } + } + + return s.packetData[:length-paddingLength-1], nil +} + +// writePacket encrypts and sends a packet of data to the writer argument +func (s *streamPacketCipher) writePacket(seqNum uint32, w io.Writer, rand io.Reader, packet []byte) error { + if len(packet) > maxPacket { + return errors.New("ssh: packet too large") + } + + aadlen := 0 + if s.mac != nil && s.etm { + // packet length is not encrypted for EtM modes + aadlen = 4 + } + + paddingLength := packetSizeMultiple - (prefixLen+len(packet)-aadlen)%packetSizeMultiple + if paddingLength < 4 { + paddingLength += packetSizeMultiple + } + + length := len(packet) + 1 + paddingLength + binary.BigEndian.PutUint32(s.prefix[:], uint32(length)) + s.prefix[4] = byte(paddingLength) + padding := s.padding[:paddingLength] + if _, err := io.ReadFull(rand, padding); err != nil { + return err + } + + if s.mac != nil { + s.mac.Reset() + binary.BigEndian.PutUint32(s.seqNumBytes[:], seqNum) + s.mac.Write(s.seqNumBytes[:]) + + if s.etm { + // For EtM algorithms, the packet length must stay unencrypted, + // but the following data (padding length) must be encrypted + s.cipher.XORKeyStream(s.prefix[4:5], s.prefix[4:5]) + } + + s.mac.Write(s.prefix[:]) + + if !s.etm { + // For non-EtM algorithms, the algorithm is applied on unencrypted data + s.mac.Write(packet) + s.mac.Write(padding) + } + } + + if !(s.mac != nil && s.etm) { + // For EtM algorithms, the padding length has already been encrypted + // and the packet length must remain unencrypted + s.cipher.XORKeyStream(s.prefix[:], s.prefix[:]) + } + + s.cipher.XORKeyStream(packet, packet) + s.cipher.XORKeyStream(padding, padding) + + if s.mac != nil && s.etm { + // For EtM algorithms, packet and padding must be encrypted + s.mac.Write(packet) + s.mac.Write(padding) + } + + if _, err := w.Write(s.prefix[:]); err != nil { + return err + } + if _, err := w.Write(packet); err != nil { + return err + } + if _, err := w.Write(padding); err != nil { + return err + } + + if s.mac != nil { + s.macResult = s.mac.Sum(s.macResult[:0]) + if _, err := w.Write(s.macResult); err != nil { + return err + } + } + + return nil +} + +type gcmCipher struct { + aead cipher.AEAD + prefix [4]byte + iv []byte + buf []byte +} + +func newGCMCipher(iv, key, macKey []byte) (packetCipher, error) { + c, err := aes.NewCipher(key) + if err != nil { + return nil, err + } + + aead, err := cipher.NewGCM(c) + if err != nil { + return nil, err + } + + return &gcmCipher{ + aead: aead, + iv: iv, + }, nil +} + +const gcmTagSize = 16 + +func (c *gcmCipher) writePacket(seqNum uint32, w io.Writer, rand io.Reader, packet []byte) error { + // Pad out to multiple of 16 bytes. This is different from the + // stream cipher because that encrypts the length too. + padding := byte(packetSizeMultiple - (1+len(packet))%packetSizeMultiple) + if padding < 4 { + padding += packetSizeMultiple + } + + length := uint32(len(packet) + int(padding) + 1) + binary.BigEndian.PutUint32(c.prefix[:], length) + if _, err := w.Write(c.prefix[:]); err != nil { + return err + } + + if cap(c.buf) < int(length) { + c.buf = make([]byte, length) + } else { + c.buf = c.buf[:length] + } + + c.buf[0] = padding + copy(c.buf[1:], packet) + if _, err := io.ReadFull(rand, c.buf[1+len(packet):]); err != nil { + return err + } + c.buf = c.aead.Seal(c.buf[:0], c.iv, c.buf, c.prefix[:]) + if _, err := w.Write(c.buf); err != nil { + return err + } + c.incIV() + + return nil +} + +func (c *gcmCipher) incIV() { + for i := 4 + 7; i >= 4; i-- { + c.iv[i]++ + if c.iv[i] != 0 { + break + } + } +} + +func (c *gcmCipher) readPacket(seqNum uint32, r io.Reader) ([]byte, error) { + if _, err := io.ReadFull(r, c.prefix[:]); err != nil { + return nil, err + } + length := binary.BigEndian.Uint32(c.prefix[:]) + if length > maxPacket { + return nil, errors.New("ssh: max packet length exceeded.") + } + + if cap(c.buf) < int(length+gcmTagSize) { + c.buf = make([]byte, length+gcmTagSize) + } else { + c.buf = c.buf[:length+gcmTagSize] + } + + if _, err := io.ReadFull(r, c.buf); err != nil { + return nil, err + } + + plain, err := c.aead.Open(c.buf[:0], c.iv, c.buf, c.prefix[:]) + if err != nil { + return nil, err + } + c.incIV() + + padding := plain[0] + if padding < 4 { + // padding is a byte, so it automatically satisfies + // the maximum size, which is 255. + return nil, fmt.Errorf("ssh: illegal padding %d", padding) + } + + if int(padding+1) >= len(plain) { + return nil, fmt.Errorf("ssh: padding %d too large", padding) + } + plain = plain[1 : length-uint32(padding)] + return plain, nil +} + +// cbcCipher implements aes128-cbc cipher defined in RFC 4253 section 6.1 +type cbcCipher struct { + mac hash.Hash + macSize uint32 + decrypter cipher.BlockMode + encrypter cipher.BlockMode + + // The following members are to avoid per-packet allocations. + seqNumBytes [4]byte + packetData []byte + macResult []byte + + // Amount of data we should still read to hide which + // verification error triggered. + oracleCamouflage uint32 +} + +func newCBCCipher(c cipher.Block, iv, key, macKey []byte, algs directionAlgorithms) (packetCipher, error) { + cbc := &cbcCipher{ + mac: macModes[algs.MAC].new(macKey), + decrypter: cipher.NewCBCDecrypter(c, iv), + encrypter: cipher.NewCBCEncrypter(c, iv), + packetData: make([]byte, 1024), + } + if cbc.mac != nil { + cbc.macSize = uint32(cbc.mac.Size()) + } + + return cbc, nil +} + +func newAESCBCCipher(iv, key, macKey []byte, algs directionAlgorithms) (packetCipher, error) { + c, err := aes.NewCipher(key) + if err != nil { + return nil, err + } + + cbc, err := newCBCCipher(c, iv, key, macKey, algs) + if err != nil { + return nil, err + } + + return cbc, nil +} + +func newTripleDESCBCCipher(iv, key, macKey []byte, algs directionAlgorithms) (packetCipher, error) { + c, err := des.NewTripleDESCipher(key) + if err != nil { + return nil, err + } + + cbc, err := newCBCCipher(c, iv, key, macKey, algs) + if err != nil { + return nil, err + } + + return cbc, nil +} + +func maxUInt32(a, b int) uint32 { + if a > b { + return uint32(a) + } + return uint32(b) +} + +const ( + cbcMinPacketSizeMultiple = 8 + cbcMinPacketSize = 16 + cbcMinPaddingSize = 4 +) + +// cbcError represents a verification error that may leak information. +type cbcError string + +func (e cbcError) Error() string { return string(e) } + +func (c *cbcCipher) readPacket(seqNum uint32, r io.Reader) ([]byte, error) { + p, err := c.readPacketLeaky(seqNum, r) + if err != nil { + if _, ok := err.(cbcError); ok { + // Verification error: read a fixed amount of + // data, to make distinguishing between + // failing MAC and failing length check more + // difficult. + io.CopyN(ioutil.Discard, r, int64(c.oracleCamouflage)) + } + } + return p, err +} + +func (c *cbcCipher) readPacketLeaky(seqNum uint32, r io.Reader) ([]byte, error) { + blockSize := c.decrypter.BlockSize() + + // Read the header, which will include some of the subsequent data in the + // case of block ciphers - this is copied back to the payload later. + // How many bytes of payload/padding will be read with this first read. + firstBlockLength := uint32((prefixLen + blockSize - 1) / blockSize * blockSize) + firstBlock := c.packetData[:firstBlockLength] + if _, err := io.ReadFull(r, firstBlock); err != nil { + return nil, err + } + + c.oracleCamouflage = maxPacket + 4 + c.macSize - firstBlockLength + + c.decrypter.CryptBlocks(firstBlock, firstBlock) + length := binary.BigEndian.Uint32(firstBlock[:4]) + if length > maxPacket { + return nil, cbcError("ssh: packet too large") + } + if length+4 < maxUInt32(cbcMinPacketSize, blockSize) { + // The minimum size of a packet is 16 (or the cipher block size, whichever + // is larger) bytes. + return nil, cbcError("ssh: packet too small") + } + // The length of the packet (including the length field but not the MAC) must + // be a multiple of the block size or 8, whichever is larger. + if (length+4)%maxUInt32(cbcMinPacketSizeMultiple, blockSize) != 0 { + return nil, cbcError("ssh: invalid packet length multiple") + } + + paddingLength := uint32(firstBlock[4]) + if paddingLength < cbcMinPaddingSize || length <= paddingLength+1 { + return nil, cbcError("ssh: invalid packet length") + } + + // Positions within the c.packetData buffer: + macStart := 4 + length + paddingStart := macStart - paddingLength + + // Entire packet size, starting before length, ending at end of mac. + entirePacketSize := macStart + c.macSize + + // Ensure c.packetData is large enough for the entire packet data. + if uint32(cap(c.packetData)) < entirePacketSize { + // Still need to upsize and copy, but this should be rare at runtime, only + // on upsizing the packetData buffer. + c.packetData = make([]byte, entirePacketSize) + copy(c.packetData, firstBlock) + } else { + c.packetData = c.packetData[:entirePacketSize] + } + + if n, err := io.ReadFull(r, c.packetData[firstBlockLength:]); err != nil { + return nil, err + } else { + c.oracleCamouflage -= uint32(n) + } + + remainingCrypted := c.packetData[firstBlockLength:macStart] + c.decrypter.CryptBlocks(remainingCrypted, remainingCrypted) + + mac := c.packetData[macStart:] + if c.mac != nil { + c.mac.Reset() + binary.BigEndian.PutUint32(c.seqNumBytes[:], seqNum) + c.mac.Write(c.seqNumBytes[:]) + c.mac.Write(c.packetData[:macStart]) + c.macResult = c.mac.Sum(c.macResult[:0]) + if subtle.ConstantTimeCompare(c.macResult, mac) != 1 { + return nil, cbcError("ssh: MAC failure") + } + } + + return c.packetData[prefixLen:paddingStart], nil +} + +func (c *cbcCipher) writePacket(seqNum uint32, w io.Writer, rand io.Reader, packet []byte) error { + effectiveBlockSize := maxUInt32(cbcMinPacketSizeMultiple, c.encrypter.BlockSize()) + + // Length of encrypted portion of the packet (header, payload, padding). + // Enforce minimum padding and packet size. + encLength := maxUInt32(prefixLen+len(packet)+cbcMinPaddingSize, cbcMinPaddingSize) + // Enforce block size. + encLength = (encLength + effectiveBlockSize - 1) / effectiveBlockSize * effectiveBlockSize + + length := encLength - 4 + paddingLength := int(length) - (1 + len(packet)) + + // Overall buffer contains: header, payload, padding, mac. + // Space for the MAC is reserved in the capacity but not the slice length. + bufferSize := encLength + c.macSize + if uint32(cap(c.packetData)) < bufferSize { + c.packetData = make([]byte, encLength, bufferSize) + } else { + c.packetData = c.packetData[:encLength] + } + + p := c.packetData + + // Packet header. + binary.BigEndian.PutUint32(p, length) + p = p[4:] + p[0] = byte(paddingLength) + + // Payload. + p = p[1:] + copy(p, packet) + + // Padding. + p = p[len(packet):] + if _, err := io.ReadFull(rand, p); err != nil { + return err + } + + if c.mac != nil { + c.mac.Reset() + binary.BigEndian.PutUint32(c.seqNumBytes[:], seqNum) + c.mac.Write(c.seqNumBytes[:]) + c.mac.Write(c.packetData) + // The MAC is now appended into the capacity reserved for it earlier. + c.packetData = c.mac.Sum(c.packetData) + } + + c.encrypter.CryptBlocks(c.packetData[:encLength], c.packetData[:encLength]) + + if _, err := w.Write(c.packetData); err != nil { + return err + } + + return nil +} diff --git a/vendor/golang.org/x/crypto/ssh/cipher_test.go b/vendor/golang.org/x/crypto/ssh/cipher_test.go new file mode 100644 index 0000000..5cfa17a --- /dev/null +++ b/vendor/golang.org/x/crypto/ssh/cipher_test.go @@ -0,0 +1,129 @@ +// Copyright 2011 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package ssh + +import ( + "bytes" + "crypto" + "crypto/aes" + "crypto/rand" + "testing" +) + +func TestDefaultCiphersExist(t *testing.T) { + for _, cipherAlgo := range supportedCiphers { + if _, ok := cipherModes[cipherAlgo]; !ok { + t.Errorf("default cipher %q is unknown", cipherAlgo) + } + } +} + +func TestPacketCiphers(t *testing.T) { + // Still test aes128cbc cipher although it's commented out. + cipherModes[aes128cbcID] = &streamCipherMode{16, aes.BlockSize, 0, nil} + defer delete(cipherModes, aes128cbcID) + + for cipher := range cipherModes { + for mac := range macModes { + kr := &kexResult{Hash: crypto.SHA1} + algs := directionAlgorithms{ + Cipher: cipher, + MAC: mac, + Compression: "none", + } + client, err := newPacketCipher(clientKeys, algs, kr) + if err != nil { + t.Errorf("newPacketCipher(client, %q, %q): %v", cipher, mac, err) + continue + } + server, err := newPacketCipher(clientKeys, algs, kr) + if err != nil { + t.Errorf("newPacketCipher(client, %q, %q): %v", cipher, mac, err) + continue + } + + want := "bla bla" + input := []byte(want) + buf := &bytes.Buffer{} + if err := client.writePacket(0, buf, rand.Reader, input); err != nil { + t.Errorf("writePacket(%q, %q): %v", cipher, mac, err) + continue + } + + packet, err := server.readPacket(0, buf) + if err != nil { + t.Errorf("readPacket(%q, %q): %v", cipher, mac, err) + continue + } + + if string(packet) != want { + t.Errorf("roundtrip(%q, %q): got %q, want %q", cipher, mac, packet, want) + } + } + } +} + +func TestCBCOracleCounterMeasure(t *testing.T) { + cipherModes[aes128cbcID] = &streamCipherMode{16, aes.BlockSize, 0, nil} + defer delete(cipherModes, aes128cbcID) + + kr := &kexResult{Hash: crypto.SHA1} + algs := directionAlgorithms{ + Cipher: aes128cbcID, + MAC: "hmac-sha1", + Compression: "none", + } + client, err := newPacketCipher(clientKeys, algs, kr) + if err != nil { + t.Fatalf("newPacketCipher(client): %v", err) + } + + want := "bla bla" + input := []byte(want) + buf := &bytes.Buffer{} + if err := client.writePacket(0, buf, rand.Reader, input); err != nil { + t.Errorf("writePacket: %v", err) + } + + packetSize := buf.Len() + buf.Write(make([]byte, 2*maxPacket)) + + // We corrupt each byte, but this usually will only test the + // 'packet too large' or 'MAC failure' cases. + lastRead := -1 + for i := 0; i < packetSize; i++ { + server, err := newPacketCipher(clientKeys, algs, kr) + if err != nil { + t.Fatalf("newPacketCipher(client): %v", err) + } + + fresh := &bytes.Buffer{} + fresh.Write(buf.Bytes()) + fresh.Bytes()[i] ^= 0x01 + + before := fresh.Len() + _, err = server.readPacket(0, fresh) + if err == nil { + t.Errorf("corrupt byte %d: readPacket succeeded ", i) + continue + } + if _, ok := err.(cbcError); !ok { + t.Errorf("corrupt byte %d: got %v (%T), want cbcError", i, err, err) + continue + } + + after := fresh.Len() + bytesRead := before - after + if bytesRead < maxPacket { + t.Errorf("corrupt byte %d: read %d bytes, want more than %d", i, bytesRead, maxPacket) + continue + } + + if i > 0 && bytesRead != lastRead { + t.Errorf("corrupt byte %d: read %d bytes, want %d bytes read", i, bytesRead, lastRead) + } + lastRead = bytesRead + } +} diff --git a/vendor/golang.org/x/crypto/ssh/client.go b/vendor/golang.org/x/crypto/ssh/client.go new file mode 100644 index 0000000..a7e3263 --- /dev/null +++ b/vendor/golang.org/x/crypto/ssh/client.go @@ -0,0 +1,257 @@ +// Copyright 2011 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package ssh + +import ( + "bytes" + "errors" + "fmt" + "net" + "sync" + "time" +) + +// Client implements a traditional SSH client that supports shells, +// subprocesses, TCP port/streamlocal forwarding and tunneled dialing. +type Client struct { + Conn + + forwards forwardList // forwarded tcpip connections from the remote side + mu sync.Mutex + channelHandlers map[string]chan NewChannel +} + +// HandleChannelOpen returns a channel on which NewChannel requests +// for the given type are sent. If the type already is being handled, +// nil is returned. The channel is closed when the connection is closed. +func (c *Client) HandleChannelOpen(channelType string) <-chan NewChannel { + c.mu.Lock() + defer c.mu.Unlock() + if c.channelHandlers == nil { + // The SSH channel has been closed. + c := make(chan NewChannel) + close(c) + return c + } + + ch := c.channelHandlers[channelType] + if ch != nil { + return nil + } + + ch = make(chan NewChannel, chanSize) + c.channelHandlers[channelType] = ch + return ch +} + +// NewClient creates a Client on top of the given connection. +func NewClient(c Conn, chans <-chan NewChannel, reqs <-chan *Request) *Client { + conn := &Client{ + Conn: c, + channelHandlers: make(map[string]chan NewChannel, 1), + } + + go conn.handleGlobalRequests(reqs) + go conn.handleChannelOpens(chans) + go func() { + conn.Wait() + conn.forwards.closeAll() + }() + go conn.forwards.handleChannels(conn.HandleChannelOpen("forwarded-tcpip")) + go conn.forwards.handleChannels(conn.HandleChannelOpen("forwarded-streamlocal@openssh.com")) + return conn +} + +// NewClientConn establishes an authenticated SSH connection using c +// as the underlying transport. The Request and NewChannel channels +// must be serviced or the connection will hang. +func NewClientConn(c net.Conn, addr string, config *ClientConfig) (Conn, <-chan NewChannel, <-chan *Request, error) { + fullConf := *config + fullConf.SetDefaults() + if fullConf.HostKeyCallback == nil { + c.Close() + return nil, nil, nil, errors.New("ssh: must specify HostKeyCallback") + } + + conn := &connection{ + sshConn: sshConn{conn: c}, + } + + if err := conn.clientHandshake(addr, &fullConf); err != nil { + c.Close() + return nil, nil, nil, fmt.Errorf("ssh: handshake failed: %v", err) + } + conn.mux = newMux(conn.transport) + return conn, conn.mux.incomingChannels, conn.mux.incomingRequests, nil +} + +// clientHandshake performs the client side key exchange. See RFC 4253 Section +// 7. +func (c *connection) clientHandshake(dialAddress string, config *ClientConfig) error { + if config.ClientVersion != "" { + c.clientVersion = []byte(config.ClientVersion) + } else { + c.clientVersion = []byte(packageVersion) + } + var err error + c.serverVersion, err = exchangeVersions(c.sshConn.conn, c.clientVersion) + if err != nil { + return err + } + + c.transport = newClientTransport( + newTransport(c.sshConn.conn, config.Rand, true /* is client */), + c.clientVersion, c.serverVersion, config, dialAddress, c.sshConn.RemoteAddr()) + if err := c.transport.waitSession(); err != nil { + return err + } + + c.sessionID = c.transport.getSessionID() + return c.clientAuthenticate(config) +} + +// verifyHostKeySignature verifies the host key obtained in the key +// exchange. +func verifyHostKeySignature(hostKey PublicKey, result *kexResult) error { + sig, rest, ok := parseSignatureBody(result.Signature) + if len(rest) > 0 || !ok { + return errors.New("ssh: signature parse error") + } + + return hostKey.Verify(result.H, sig) +} + +// NewSession opens a new Session for this client. (A session is a remote +// execution of a program.) +func (c *Client) NewSession() (*Session, error) { + ch, in, err := c.OpenChannel("session", nil) + if err != nil { + return nil, err + } + return newSession(ch, in) +} + +func (c *Client) handleGlobalRequests(incoming <-chan *Request) { + for r := range incoming { + // This handles keepalive messages and matches + // the behaviour of OpenSSH. + r.Reply(false, nil) + } +} + +// handleChannelOpens channel open messages from the remote side. +func (c *Client) handleChannelOpens(in <-chan NewChannel) { + for ch := range in { + c.mu.Lock() + handler := c.channelHandlers[ch.ChannelType()] + c.mu.Unlock() + + if handler != nil { + handler <- ch + } else { + ch.Reject(UnknownChannelType, fmt.Sprintf("unknown channel type: %v", ch.ChannelType())) + } + } + + c.mu.Lock() + for _, ch := range c.channelHandlers { + close(ch) + } + c.channelHandlers = nil + c.mu.Unlock() +} + +// Dial starts a client connection to the given SSH server. It is a +// convenience function that connects to the given network address, +// initiates the SSH handshake, and then sets up a Client. For access +// to incoming channels and requests, use net.Dial with NewClientConn +// instead. +func Dial(network, addr string, config *ClientConfig) (*Client, error) { + conn, err := net.DialTimeout(network, addr, config.Timeout) + if err != nil { + return nil, err + } + c, chans, reqs, err := NewClientConn(conn, addr, config) + if err != nil { + return nil, err + } + return NewClient(c, chans, reqs), nil +} + +// HostKeyCallback is the function type used for verifying server +// keys. A HostKeyCallback must return nil if the host key is OK, or +// an error to reject it. It receives the hostname as passed to Dial +// or NewClientConn. The remote address is the RemoteAddr of the +// net.Conn underlying the the SSH connection. +type HostKeyCallback func(hostname string, remote net.Addr, key PublicKey) error + +// A ClientConfig structure is used to configure a Client. It must not be +// modified after having been passed to an SSH function. +type ClientConfig struct { + // Config contains configuration that is shared between clients and + // servers. + Config + + // User contains the username to authenticate as. + User string + + // Auth contains possible authentication methods to use with the + // server. Only the first instance of a particular RFC 4252 method will + // be used during authentication. + Auth []AuthMethod + + // HostKeyCallback is called during the cryptographic + // handshake to validate the server's host key. The client + // configuration must supply this callback for the connection + // to succeed. The functions InsecureIgnoreHostKey or + // FixedHostKey can be used for simplistic host key checks. + HostKeyCallback HostKeyCallback + + // ClientVersion contains the version identification string that will + // be used for the connection. If empty, a reasonable default is used. + ClientVersion string + + // HostKeyAlgorithms lists the key types that the client will + // accept from the server as host key, in order of + // preference. If empty, a reasonable default is used. Any + // string returned from PublicKey.Type method may be used, or + // any of the CertAlgoXxxx and KeyAlgoXxxx constants. + HostKeyAlgorithms []string + + // Timeout is the maximum amount of time for the TCP connection to establish. + // + // A Timeout of zero means no timeout. + Timeout time.Duration +} + +// InsecureIgnoreHostKey returns a function that can be used for +// ClientConfig.HostKeyCallback to accept any host key. It should +// not be used for production code. +func InsecureIgnoreHostKey() HostKeyCallback { + return func(hostname string, remote net.Addr, key PublicKey) error { + return nil + } +} + +type fixedHostKey struct { + key PublicKey +} + +func (f *fixedHostKey) check(hostname string, remote net.Addr, key PublicKey) error { + if f.key == nil { + return fmt.Errorf("ssh: required host key was nil") + } + if !bytes.Equal(key.Marshal(), f.key.Marshal()) { + return fmt.Errorf("ssh: host key mismatch") + } + return nil +} + +// FixedHostKey returns a function for use in +// ClientConfig.HostKeyCallback to accept only a specific host key. +func FixedHostKey(key PublicKey) HostKeyCallback { + hk := &fixedHostKey{key} + return hk.check +} diff --git a/vendor/golang.org/x/crypto/ssh/client_auth.go b/vendor/golang.org/x/crypto/ssh/client_auth.go new file mode 100644 index 0000000..b882da0 --- /dev/null +++ b/vendor/golang.org/x/crypto/ssh/client_auth.go @@ -0,0 +1,486 @@ +// Copyright 2011 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package ssh + +import ( + "bytes" + "errors" + "fmt" + "io" +) + +// clientAuthenticate authenticates with the remote server. See RFC 4252. +func (c *connection) clientAuthenticate(config *ClientConfig) error { + // initiate user auth session + if err := c.transport.writePacket(Marshal(&serviceRequestMsg{serviceUserAuth})); err != nil { + return err + } + packet, err := c.transport.readPacket() + if err != nil { + return err + } + var serviceAccept serviceAcceptMsg + if err := Unmarshal(packet, &serviceAccept); err != nil { + return err + } + + // during the authentication phase the client first attempts the "none" method + // then any untried methods suggested by the server. + tried := make(map[string]bool) + var lastMethods []string + + sessionID := c.transport.getSessionID() + for auth := AuthMethod(new(noneAuth)); auth != nil; { + ok, methods, err := auth.auth(sessionID, config.User, c.transport, config.Rand) + if err != nil { + return err + } + if ok { + // success + return nil + } + tried[auth.method()] = true + if methods == nil { + methods = lastMethods + } + lastMethods = methods + + auth = nil + + findNext: + for _, a := range config.Auth { + candidateMethod := a.method() + if tried[candidateMethod] { + continue + } + for _, meth := range methods { + if meth == candidateMethod { + auth = a + break findNext + } + } + } + } + return fmt.Errorf("ssh: unable to authenticate, attempted methods %v, no supported methods remain", keys(tried)) +} + +func keys(m map[string]bool) []string { + s := make([]string, 0, len(m)) + + for key := range m { + s = append(s, key) + } + return s +} + +// An AuthMethod represents an instance of an RFC 4252 authentication method. +type AuthMethod interface { + // auth authenticates user over transport t. + // Returns true if authentication is successful. + // If authentication is not successful, a []string of alternative + // method names is returned. If the slice is nil, it will be ignored + // and the previous set of possible methods will be reused. + auth(session []byte, user string, p packetConn, rand io.Reader) (bool, []string, error) + + // method returns the RFC 4252 method name. + method() string +} + +// "none" authentication, RFC 4252 section 5.2. +type noneAuth int + +func (n *noneAuth) auth(session []byte, user string, c packetConn, rand io.Reader) (bool, []string, error) { + if err := c.writePacket(Marshal(&userAuthRequestMsg{ + User: user, + Service: serviceSSH, + Method: "none", + })); err != nil { + return false, nil, err + } + + return handleAuthResponse(c) +} + +func (n *noneAuth) method() string { + return "none" +} + +// passwordCallback is an AuthMethod that fetches the password through +// a function call, e.g. by prompting the user. +type passwordCallback func() (password string, err error) + +func (cb passwordCallback) auth(session []byte, user string, c packetConn, rand io.Reader) (bool, []string, error) { + type passwordAuthMsg struct { + User string `sshtype:"50"` + Service string + Method string + Reply bool + Password string + } + + pw, err := cb() + // REVIEW NOTE: is there a need to support skipping a password attempt? + // The program may only find out that the user doesn't have a password + // when prompting. + if err != nil { + return false, nil, err + } + + if err := c.writePacket(Marshal(&passwordAuthMsg{ + User: user, + Service: serviceSSH, + Method: cb.method(), + Reply: false, + Password: pw, + })); err != nil { + return false, nil, err + } + + return handleAuthResponse(c) +} + +func (cb passwordCallback) method() string { + return "password" +} + +// Password returns an AuthMethod using the given password. +func Password(secret string) AuthMethod { + return passwordCallback(func() (string, error) { return secret, nil }) +} + +// PasswordCallback returns an AuthMethod that uses a callback for +// fetching a password. +func PasswordCallback(prompt func() (secret string, err error)) AuthMethod { + return passwordCallback(prompt) +} + +type publickeyAuthMsg struct { + User string `sshtype:"50"` + Service string + Method string + // HasSig indicates to the receiver packet that the auth request is signed and + // should be used for authentication of the request. + HasSig bool + Algoname string + PubKey []byte + // Sig is tagged with "rest" so Marshal will exclude it during + // validateKey + Sig []byte `ssh:"rest"` +} + +// publicKeyCallback is an AuthMethod that uses a set of key +// pairs for authentication. +type publicKeyCallback func() ([]Signer, error) + +func (cb publicKeyCallback) method() string { + return "publickey" +} + +func (cb publicKeyCallback) auth(session []byte, user string, c packetConn, rand io.Reader) (bool, []string, error) { + // Authentication is performed by sending an enquiry to test if a key is + // acceptable to the remote. If the key is acceptable, the client will + // attempt to authenticate with the valid key. If not the client will repeat + // the process with the remaining keys. + + signers, err := cb() + if err != nil { + return false, nil, err + } + var methods []string + for _, signer := range signers { + ok, err := validateKey(signer.PublicKey(), user, c) + if err != nil { + return false, nil, err + } + if !ok { + continue + } + + pub := signer.PublicKey() + pubKey := pub.Marshal() + sign, err := signer.Sign(rand, buildDataSignedForAuth(session, userAuthRequestMsg{ + User: user, + Service: serviceSSH, + Method: cb.method(), + }, []byte(pub.Type()), pubKey)) + if err != nil { + return false, nil, err + } + + // manually wrap the serialized signature in a string + s := Marshal(sign) + sig := make([]byte, stringLength(len(s))) + marshalString(sig, s) + msg := publickeyAuthMsg{ + User: user, + Service: serviceSSH, + Method: cb.method(), + HasSig: true, + Algoname: pub.Type(), + PubKey: pubKey, + Sig: sig, + } + p := Marshal(&msg) + if err := c.writePacket(p); err != nil { + return false, nil, err + } + var success bool + success, methods, err = handleAuthResponse(c) + if err != nil { + return false, nil, err + } + + // If authentication succeeds or the list of available methods does not + // contain the "publickey" method, do not attempt to authenticate with any + // other keys. According to RFC 4252 Section 7, the latter can occur when + // additional authentication methods are required. + if success || !containsMethod(methods, cb.method()) { + return success, methods, err + } + } + + return false, methods, nil +} + +func containsMethod(methods []string, method string) bool { + for _, m := range methods { + if m == method { + return true + } + } + + return false +} + +// validateKey validates the key provided is acceptable to the server. +func validateKey(key PublicKey, user string, c packetConn) (bool, error) { + pubKey := key.Marshal() + msg := publickeyAuthMsg{ + User: user, + Service: serviceSSH, + Method: "publickey", + HasSig: false, + Algoname: key.Type(), + PubKey: pubKey, + } + if err := c.writePacket(Marshal(&msg)); err != nil { + return false, err + } + + return confirmKeyAck(key, c) +} + +func confirmKeyAck(key PublicKey, c packetConn) (bool, error) { + pubKey := key.Marshal() + algoname := key.Type() + + for { + packet, err := c.readPacket() + if err != nil { + return false, err + } + switch packet[0] { + case msgUserAuthBanner: + // TODO(gpaul): add callback to present the banner to the user + case msgUserAuthPubKeyOk: + var msg userAuthPubKeyOkMsg + if err := Unmarshal(packet, &msg); err != nil { + return false, err + } + if msg.Algo != algoname || !bytes.Equal(msg.PubKey, pubKey) { + return false, nil + } + return true, nil + case msgUserAuthFailure: + return false, nil + default: + return false, unexpectedMessageError(msgUserAuthSuccess, packet[0]) + } + } +} + +// PublicKeys returns an AuthMethod that uses the given key +// pairs. +func PublicKeys(signers ...Signer) AuthMethod { + return publicKeyCallback(func() ([]Signer, error) { return signers, nil }) +} + +// PublicKeysCallback returns an AuthMethod that runs the given +// function to obtain a list of key pairs. +func PublicKeysCallback(getSigners func() (signers []Signer, err error)) AuthMethod { + return publicKeyCallback(getSigners) +} + +// handleAuthResponse returns whether the preceding authentication request succeeded +// along with a list of remaining authentication methods to try next and +// an error if an unexpected response was received. +func handleAuthResponse(c packetConn) (bool, []string, error) { + for { + packet, err := c.readPacket() + if err != nil { + return false, nil, err + } + + switch packet[0] { + case msgUserAuthBanner: + // TODO: add callback to present the banner to the user + case msgUserAuthFailure: + var msg userAuthFailureMsg + if err := Unmarshal(packet, &msg); err != nil { + return false, nil, err + } + return false, msg.Methods, nil + case msgUserAuthSuccess: + return true, nil, nil + default: + return false, nil, unexpectedMessageError(msgUserAuthSuccess, packet[0]) + } + } +} + +// KeyboardInteractiveChallenge should print questions, optionally +// disabling echoing (e.g. for passwords), and return all the answers. +// Challenge may be called multiple times in a single session. After +// successful authentication, the server may send a challenge with no +// questions, for which the user and instruction messages should be +// printed. RFC 4256 section 3.3 details how the UI should behave for +// both CLI and GUI environments. +type KeyboardInteractiveChallenge func(user, instruction string, questions []string, echos []bool) (answers []string, err error) + +// KeyboardInteractive returns a AuthMethod using a prompt/response +// sequence controlled by the server. +func KeyboardInteractive(challenge KeyboardInteractiveChallenge) AuthMethod { + return challenge +} + +func (cb KeyboardInteractiveChallenge) method() string { + return "keyboard-interactive" +} + +func (cb KeyboardInteractiveChallenge) auth(session []byte, user string, c packetConn, rand io.Reader) (bool, []string, error) { + type initiateMsg struct { + User string `sshtype:"50"` + Service string + Method string + Language string + Submethods string + } + + if err := c.writePacket(Marshal(&initiateMsg{ + User: user, + Service: serviceSSH, + Method: "keyboard-interactive", + })); err != nil { + return false, nil, err + } + + for { + packet, err := c.readPacket() + if err != nil { + return false, nil, err + } + + // like handleAuthResponse, but with less options. + switch packet[0] { + case msgUserAuthBanner: + // TODO: Print banners during userauth. + continue + case msgUserAuthInfoRequest: + // OK + case msgUserAuthFailure: + var msg userAuthFailureMsg + if err := Unmarshal(packet, &msg); err != nil { + return false, nil, err + } + return false, msg.Methods, nil + case msgUserAuthSuccess: + return true, nil, nil + default: + return false, nil, unexpectedMessageError(msgUserAuthInfoRequest, packet[0]) + } + + var msg userAuthInfoRequestMsg + if err := Unmarshal(packet, &msg); err != nil { + return false, nil, err + } + + // Manually unpack the prompt/echo pairs. + rest := msg.Prompts + var prompts []string + var echos []bool + for i := 0; i < int(msg.NumPrompts); i++ { + prompt, r, ok := parseString(rest) + if !ok || len(r) == 0 { + return false, nil, errors.New("ssh: prompt format error") + } + prompts = append(prompts, string(prompt)) + echos = append(echos, r[0] != 0) + rest = r[1:] + } + + if len(rest) != 0 { + return false, nil, errors.New("ssh: extra data following keyboard-interactive pairs") + } + + answers, err := cb(msg.User, msg.Instruction, prompts, echos) + if err != nil { + return false, nil, err + } + + if len(answers) != len(prompts) { + return false, nil, errors.New("ssh: not enough answers from keyboard-interactive callback") + } + responseLength := 1 + 4 + for _, a := range answers { + responseLength += stringLength(len(a)) + } + serialized := make([]byte, responseLength) + p := serialized + p[0] = msgUserAuthInfoResponse + p = p[1:] + p = marshalUint32(p, uint32(len(answers))) + for _, a := range answers { + p = marshalString(p, []byte(a)) + } + + if err := c.writePacket(serialized); err != nil { + return false, nil, err + } + } +} + +type retryableAuthMethod struct { + authMethod AuthMethod + maxTries int +} + +func (r *retryableAuthMethod) auth(session []byte, user string, c packetConn, rand io.Reader) (ok bool, methods []string, err error) { + for i := 0; r.maxTries <= 0 || i < r.maxTries; i++ { + ok, methods, err = r.authMethod.auth(session, user, c, rand) + if ok || err != nil { // either success or error terminate + return ok, methods, err + } + } + return ok, methods, err +} + +func (r *retryableAuthMethod) method() string { + return r.authMethod.method() +} + +// RetryableAuthMethod is a decorator for other auth methods enabling them to +// be retried up to maxTries before considering that AuthMethod itself failed. +// If maxTries is <= 0, will retry indefinitely +// +// This is useful for interactive clients using challenge/response type +// authentication (e.g. Keyboard-Interactive, Password, etc) where the user +// could mistype their response resulting in the server issuing a +// SSH_MSG_USERAUTH_FAILURE (rfc4252 #8 [password] and rfc4256 #3.4 +// [keyboard-interactive]); Without this decorator, the non-retryable +// AuthMethod would be removed from future consideration, and never tried again +// (and so the user would never be able to retry their entry). +func RetryableAuthMethod(auth AuthMethod, maxTries int) AuthMethod { + return &retryableAuthMethod{authMethod: auth, maxTries: maxTries} +} diff --git a/vendor/golang.org/x/crypto/ssh/client_auth_test.go b/vendor/golang.org/x/crypto/ssh/client_auth_test.go new file mode 100644 index 0000000..145b57a --- /dev/null +++ b/vendor/golang.org/x/crypto/ssh/client_auth_test.go @@ -0,0 +1,628 @@ +// Copyright 2011 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package ssh + +import ( + "bytes" + "crypto/rand" + "errors" + "fmt" + "os" + "strings" + "testing" +) + +type keyboardInteractive map[string]string + +func (cr keyboardInteractive) Challenge(user string, instruction string, questions []string, echos []bool) ([]string, error) { + var answers []string + for _, q := range questions { + answers = append(answers, cr[q]) + } + return answers, nil +} + +// reused internally by tests +var clientPassword = "tiger" + +// tryAuth runs a handshake with a given config against an SSH server +// with config serverConfig +func tryAuth(t *testing.T, config *ClientConfig) error { + c1, c2, err := netPipe() + if err != nil { + t.Fatalf("netPipe: %v", err) + } + defer c1.Close() + defer c2.Close() + + certChecker := CertChecker{ + IsUserAuthority: func(k PublicKey) bool { + return bytes.Equal(k.Marshal(), testPublicKeys["ecdsa"].Marshal()) + }, + UserKeyFallback: func(conn ConnMetadata, key PublicKey) (*Permissions, error) { + if conn.User() == "testuser" && bytes.Equal(key.Marshal(), testPublicKeys["rsa"].Marshal()) { + return nil, nil + } + + return nil, fmt.Errorf("pubkey for %q not acceptable", conn.User()) + }, + IsRevoked: func(c *Certificate) bool { + return c.Serial == 666 + }, + } + + serverConfig := &ServerConfig{ + PasswordCallback: func(conn ConnMetadata, pass []byte) (*Permissions, error) { + if conn.User() == "testuser" && string(pass) == clientPassword { + return nil, nil + } + return nil, errors.New("password auth failed") + }, + PublicKeyCallback: certChecker.Authenticate, + KeyboardInteractiveCallback: func(conn ConnMetadata, challenge KeyboardInteractiveChallenge) (*Permissions, error) { + ans, err := challenge("user", + "instruction", + []string{"question1", "question2"}, + []bool{true, true}) + if err != nil { + return nil, err + } + ok := conn.User() == "testuser" && ans[0] == "answer1" && ans[1] == "answer2" + if ok { + challenge("user", "motd", nil, nil) + return nil, nil + } + return nil, errors.New("keyboard-interactive failed") + }, + } + serverConfig.AddHostKey(testSigners["rsa"]) + + go newServer(c1, serverConfig) + _, _, _, err = NewClientConn(c2, "", config) + return err +} + +func TestClientAuthPublicKey(t *testing.T) { + config := &ClientConfig{ + User: "testuser", + Auth: []AuthMethod{ + PublicKeys(testSigners["rsa"]), + }, + HostKeyCallback: InsecureIgnoreHostKey(), + } + if err := tryAuth(t, config); err != nil { + t.Fatalf("unable to dial remote side: %s", err) + } +} + +func TestAuthMethodPassword(t *testing.T) { + config := &ClientConfig{ + User: "testuser", + Auth: []AuthMethod{ + Password(clientPassword), + }, + HostKeyCallback: InsecureIgnoreHostKey(), + } + + if err := tryAuth(t, config); err != nil { + t.Fatalf("unable to dial remote side: %s", err) + } +} + +func TestAuthMethodFallback(t *testing.T) { + var passwordCalled bool + config := &ClientConfig{ + User: "testuser", + Auth: []AuthMethod{ + PublicKeys(testSigners["rsa"]), + PasswordCallback( + func() (string, error) { + passwordCalled = true + return "WRONG", nil + }), + }, + HostKeyCallback: InsecureIgnoreHostKey(), + } + + if err := tryAuth(t, config); err != nil { + t.Fatalf("unable to dial remote side: %s", err) + } + + if passwordCalled { + t.Errorf("password auth tried before public-key auth.") + } +} + +func TestAuthMethodWrongPassword(t *testing.T) { + config := &ClientConfig{ + User: "testuser", + Auth: []AuthMethod{ + Password("wrong"), + PublicKeys(testSigners["rsa"]), + }, + HostKeyCallback: InsecureIgnoreHostKey(), + } + + if err := tryAuth(t, config); err != nil { + t.Fatalf("unable to dial remote side: %s", err) + } +} + +func TestAuthMethodKeyboardInteractive(t *testing.T) { + answers := keyboardInteractive(map[string]string{ + "question1": "answer1", + "question2": "answer2", + }) + config := &ClientConfig{ + User: "testuser", + Auth: []AuthMethod{ + KeyboardInteractive(answers.Challenge), + }, + HostKeyCallback: InsecureIgnoreHostKey(), + } + + if err := tryAuth(t, config); err != nil { + t.Fatalf("unable to dial remote side: %s", err) + } +} + +func TestAuthMethodWrongKeyboardInteractive(t *testing.T) { + answers := keyboardInteractive(map[string]string{ + "question1": "answer1", + "question2": "WRONG", + }) + config := &ClientConfig{ + User: "testuser", + Auth: []AuthMethod{ + KeyboardInteractive(answers.Challenge), + }, + } + + if err := tryAuth(t, config); err == nil { + t.Fatalf("wrong answers should not have authenticated with KeyboardInteractive") + } +} + +// the mock server will only authenticate ssh-rsa keys +func TestAuthMethodInvalidPublicKey(t *testing.T) { + config := &ClientConfig{ + User: "testuser", + Auth: []AuthMethod{ + PublicKeys(testSigners["dsa"]), + }, + } + + if err := tryAuth(t, config); err == nil { + t.Fatalf("dsa private key should not have authenticated with rsa public key") + } +} + +// the client should authenticate with the second key +func TestAuthMethodRSAandDSA(t *testing.T) { + config := &ClientConfig{ + User: "testuser", + Auth: []AuthMethod{ + PublicKeys(testSigners["dsa"], testSigners["rsa"]), + }, + HostKeyCallback: InsecureIgnoreHostKey(), + } + if err := tryAuth(t, config); err != nil { + t.Fatalf("client could not authenticate with rsa key: %v", err) + } +} + +func TestClientHMAC(t *testing.T) { + for _, mac := range supportedMACs { + config := &ClientConfig{ + User: "testuser", + Auth: []AuthMethod{ + PublicKeys(testSigners["rsa"]), + }, + Config: Config{ + MACs: []string{mac}, + }, + HostKeyCallback: InsecureIgnoreHostKey(), + } + if err := tryAuth(t, config); err != nil { + t.Fatalf("client could not authenticate with mac algo %s: %v", mac, err) + } + } +} + +// issue 4285. +func TestClientUnsupportedCipher(t *testing.T) { + config := &ClientConfig{ + User: "testuser", + Auth: []AuthMethod{ + PublicKeys(), + }, + Config: Config{ + Ciphers: []string{"aes128-cbc"}, // not currently supported + }, + } + if err := tryAuth(t, config); err == nil { + t.Errorf("expected no ciphers in common") + } +} + +func TestClientUnsupportedKex(t *testing.T) { + if os.Getenv("GO_BUILDER_NAME") != "" { + t.Skip("skipping known-flaky test on the Go build dashboard; see golang.org/issue/15198") + } + config := &ClientConfig{ + User: "testuser", + Auth: []AuthMethod{ + PublicKeys(), + }, + Config: Config{ + KeyExchanges: []string{"diffie-hellman-group-exchange-sha256"}, // not currently supported + }, + HostKeyCallback: InsecureIgnoreHostKey(), + } + if err := tryAuth(t, config); err == nil || !strings.Contains(err.Error(), "common algorithm") { + t.Errorf("got %v, expected 'common algorithm'", err) + } +} + +func TestClientLoginCert(t *testing.T) { + cert := &Certificate{ + Key: testPublicKeys["rsa"], + ValidBefore: CertTimeInfinity, + CertType: UserCert, + } + cert.SignCert(rand.Reader, testSigners["ecdsa"]) + certSigner, err := NewCertSigner(cert, testSigners["rsa"]) + if err != nil { + t.Fatalf("NewCertSigner: %v", err) + } + + clientConfig := &ClientConfig{ + User: "user", + HostKeyCallback: InsecureIgnoreHostKey(), + } + clientConfig.Auth = append(clientConfig.Auth, PublicKeys(certSigner)) + + // should succeed + if err := tryAuth(t, clientConfig); err != nil { + t.Errorf("cert login failed: %v", err) + } + + // corrupted signature + cert.Signature.Blob[0]++ + if err := tryAuth(t, clientConfig); err == nil { + t.Errorf("cert login passed with corrupted sig") + } + + // revoked + cert.Serial = 666 + cert.SignCert(rand.Reader, testSigners["ecdsa"]) + if err := tryAuth(t, clientConfig); err == nil { + t.Errorf("revoked cert login succeeded") + } + cert.Serial = 1 + + // sign with wrong key + cert.SignCert(rand.Reader, testSigners["dsa"]) + if err := tryAuth(t, clientConfig); err == nil { + t.Errorf("cert login passed with non-authoritative key") + } + + // host cert + cert.CertType = HostCert + cert.SignCert(rand.Reader, testSigners["ecdsa"]) + if err := tryAuth(t, clientConfig); err == nil { + t.Errorf("cert login passed with wrong type") + } + cert.CertType = UserCert + + // principal specified + cert.ValidPrincipals = []string{"user"} + cert.SignCert(rand.Reader, testSigners["ecdsa"]) + if err := tryAuth(t, clientConfig); err != nil { + t.Errorf("cert login failed: %v", err) + } + + // wrong principal specified + cert.ValidPrincipals = []string{"fred"} + cert.SignCert(rand.Reader, testSigners["ecdsa"]) + if err := tryAuth(t, clientConfig); err == nil { + t.Errorf("cert login passed with wrong principal") + } + cert.ValidPrincipals = nil + + // added critical option + cert.CriticalOptions = map[string]string{"root-access": "yes"} + cert.SignCert(rand.Reader, testSigners["ecdsa"]) + if err := tryAuth(t, clientConfig); err == nil { + t.Errorf("cert login passed with unrecognized critical option") + } + + // allowed source address + cert.CriticalOptions = map[string]string{"source-address": "127.0.0.42/24,::42/120"} + cert.SignCert(rand.Reader, testSigners["ecdsa"]) + if err := tryAuth(t, clientConfig); err != nil { + t.Errorf("cert login with source-address failed: %v", err) + } + + // disallowed source address + cert.CriticalOptions = map[string]string{"source-address": "127.0.0.42,::42"} + cert.SignCert(rand.Reader, testSigners["ecdsa"]) + if err := tryAuth(t, clientConfig); err == nil { + t.Errorf("cert login with source-address succeeded") + } +} + +func testPermissionsPassing(withPermissions bool, t *testing.T) { + serverConfig := &ServerConfig{ + PublicKeyCallback: func(conn ConnMetadata, key PublicKey) (*Permissions, error) { + if conn.User() == "nopermissions" { + return nil, nil + } + return &Permissions{}, nil + }, + } + serverConfig.AddHostKey(testSigners["rsa"]) + + clientConfig := &ClientConfig{ + Auth: []AuthMethod{ + PublicKeys(testSigners["rsa"]), + }, + HostKeyCallback: InsecureIgnoreHostKey(), + } + if withPermissions { + clientConfig.User = "permissions" + } else { + clientConfig.User = "nopermissions" + } + + c1, c2, err := netPipe() + if err != nil { + t.Fatalf("netPipe: %v", err) + } + defer c1.Close() + defer c2.Close() + + go NewClientConn(c2, "", clientConfig) + serverConn, err := newServer(c1, serverConfig) + if err != nil { + t.Fatal(err) + } + if p := serverConn.Permissions; (p != nil) != withPermissions { + t.Fatalf("withPermissions is %t, but Permissions object is %#v", withPermissions, p) + } +} + +func TestPermissionsPassing(t *testing.T) { + testPermissionsPassing(true, t) +} + +func TestNoPermissionsPassing(t *testing.T) { + testPermissionsPassing(false, t) +} + +func TestRetryableAuth(t *testing.T) { + n := 0 + passwords := []string{"WRONG1", "WRONG2"} + + config := &ClientConfig{ + User: "testuser", + Auth: []AuthMethod{ + RetryableAuthMethod(PasswordCallback(func() (string, error) { + p := passwords[n] + n++ + return p, nil + }), 2), + PublicKeys(testSigners["rsa"]), + }, + HostKeyCallback: InsecureIgnoreHostKey(), + } + + if err := tryAuth(t, config); err != nil { + t.Fatalf("unable to dial remote side: %s", err) + } + if n != 2 { + t.Fatalf("Did not try all passwords") + } +} + +func ExampleRetryableAuthMethod(t *testing.T) { + user := "testuser" + NumberOfPrompts := 3 + + // Normally this would be a callback that prompts the user to answer the + // provided questions + Cb := func(user, instruction string, questions []string, echos []bool) (answers []string, err error) { + return []string{"answer1", "answer2"}, nil + } + + config := &ClientConfig{ + HostKeyCallback: InsecureIgnoreHostKey(), + User: user, + Auth: []AuthMethod{ + RetryableAuthMethod(KeyboardInteractiveChallenge(Cb), NumberOfPrompts), + }, + } + + if err := tryAuth(t, config); err != nil { + t.Fatalf("unable to dial remote side: %s", err) + } +} + +// Test if username is received on server side when NoClientAuth is used +func TestClientAuthNone(t *testing.T) { + user := "testuser" + serverConfig := &ServerConfig{ + NoClientAuth: true, + } + serverConfig.AddHostKey(testSigners["rsa"]) + + clientConfig := &ClientConfig{ + User: user, + HostKeyCallback: InsecureIgnoreHostKey(), + } + + c1, c2, err := netPipe() + if err != nil { + t.Fatalf("netPipe: %v", err) + } + defer c1.Close() + defer c2.Close() + + go NewClientConn(c2, "", clientConfig) + serverConn, err := newServer(c1, serverConfig) + if err != nil { + t.Fatalf("newServer: %v", err) + } + if serverConn.User() != user { + t.Fatalf("server: got %q, want %q", serverConn.User(), user) + } +} + +// Test if authentication attempts are limited on server when MaxAuthTries is set +func TestClientAuthMaxAuthTries(t *testing.T) { + user := "testuser" + + serverConfig := &ServerConfig{ + MaxAuthTries: 2, + PasswordCallback: func(conn ConnMetadata, pass []byte) (*Permissions, error) { + if conn.User() == "testuser" && string(pass) == "right" { + return nil, nil + } + return nil, errors.New("password auth failed") + }, + } + serverConfig.AddHostKey(testSigners["rsa"]) + + expectedErr := fmt.Errorf("ssh: handshake failed: %v", &disconnectMsg{ + Reason: 2, + Message: "too many authentication failures", + }) + + for tries := 2; tries < 4; tries++ { + n := tries + clientConfig := &ClientConfig{ + User: user, + Auth: []AuthMethod{ + RetryableAuthMethod(PasswordCallback(func() (string, error) { + n-- + if n == 0 { + return "right", nil + } + return "wrong", nil + }), tries), + }, + HostKeyCallback: InsecureIgnoreHostKey(), + } + + c1, c2, err := netPipe() + if err != nil { + t.Fatalf("netPipe: %v", err) + } + defer c1.Close() + defer c2.Close() + + go newServer(c1, serverConfig) + _, _, _, err = NewClientConn(c2, "", clientConfig) + if tries > 2 { + if err == nil { + t.Fatalf("client: got no error, want %s", expectedErr) + } else if err.Error() != expectedErr.Error() { + t.Fatalf("client: got %s, want %s", err, expectedErr) + } + } else { + if err != nil { + t.Fatalf("client: got %s, want no error", err) + } + } + } +} + +// Test if authentication attempts are correctly limited on server +// when more public keys are provided then MaxAuthTries +func TestClientAuthMaxAuthTriesPublicKey(t *testing.T) { + signers := []Signer{} + for i := 0; i < 6; i++ { + signers = append(signers, testSigners["dsa"]) + } + + validConfig := &ClientConfig{ + User: "testuser", + Auth: []AuthMethod{ + PublicKeys(append([]Signer{testSigners["rsa"]}, signers...)...), + }, + HostKeyCallback: InsecureIgnoreHostKey(), + } + if err := tryAuth(t, validConfig); err != nil { + t.Fatalf("unable to dial remote side: %s", err) + } + + expectedErr := fmt.Errorf("ssh: handshake failed: %v", &disconnectMsg{ + Reason: 2, + Message: "too many authentication failures", + }) + invalidConfig := &ClientConfig{ + User: "testuser", + Auth: []AuthMethod{ + PublicKeys(append(signers, testSigners["rsa"])...), + }, + HostKeyCallback: InsecureIgnoreHostKey(), + } + if err := tryAuth(t, invalidConfig); err == nil { + t.Fatalf("client: got no error, want %s", expectedErr) + } else if err.Error() != expectedErr.Error() { + t.Fatalf("client: got %s, want %s", err, expectedErr) + } +} + +// Test whether authentication errors are being properly logged if all +// authentication methods have been exhausted +func TestClientAuthErrorList(t *testing.T) { + publicKeyErr := errors.New("This is an error from PublicKeyCallback") + + clientConfig := &ClientConfig{ + Auth: []AuthMethod{ + PublicKeys(testSigners["rsa"]), + }, + HostKeyCallback: InsecureIgnoreHostKey(), + } + serverConfig := &ServerConfig{ + PublicKeyCallback: func(_ ConnMetadata, _ PublicKey) (*Permissions, error) { + return nil, publicKeyErr + }, + } + serverConfig.AddHostKey(testSigners["rsa"]) + + c1, c2, err := netPipe() + if err != nil { + t.Fatalf("netPipe: %v", err) + } + defer c1.Close() + defer c2.Close() + + go NewClientConn(c2, "", clientConfig) + _, err = newServer(c1, serverConfig) + if err == nil { + t.Fatal("newServer: got nil, expected errors") + } + + authErrs, ok := err.(*ServerAuthError) + if !ok { + t.Fatalf("errors: got %T, want *ssh.ServerAuthError", err) + } + for i, e := range authErrs.Errors { + switch i { + case 0: + if e.Error() != "no auth passed yet" { + t.Fatalf("errors: got %v, want no auth passed yet", e.Error()) + } + case 1: + if e != publicKeyErr { + t.Fatalf("errors: got %v, want %v", e, publicKeyErr) + } + default: + t.Fatalf("errors: got %v, expected 2 errors", authErrs.Errors) + } + } +} diff --git a/vendor/golang.org/x/crypto/ssh/client_test.go b/vendor/golang.org/x/crypto/ssh/client_test.go new file mode 100644 index 0000000..ccf5607 --- /dev/null +++ b/vendor/golang.org/x/crypto/ssh/client_test.go @@ -0,0 +1,81 @@ +// Copyright 2014 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package ssh + +import ( + "net" + "strings" + "testing" +) + +func testClientVersion(t *testing.T, config *ClientConfig, expected string) { + clientConn, serverConn := net.Pipe() + defer clientConn.Close() + receivedVersion := make(chan string, 1) + config.HostKeyCallback = InsecureIgnoreHostKey() + go func() { + version, err := readVersion(serverConn) + if err != nil { + receivedVersion <- "" + } else { + receivedVersion <- string(version) + } + serverConn.Close() + }() + NewClientConn(clientConn, "", config) + actual := <-receivedVersion + if actual != expected { + t.Fatalf("got %s; want %s", actual, expected) + } +} + +func TestCustomClientVersion(t *testing.T) { + version := "Test-Client-Version-0.0" + testClientVersion(t, &ClientConfig{ClientVersion: version}, version) +} + +func TestDefaultClientVersion(t *testing.T) { + testClientVersion(t, &ClientConfig{}, packageVersion) +} + +func TestHostKeyCheck(t *testing.T) { + for _, tt := range []struct { + name string + wantError string + key PublicKey + }{ + {"no callback", "must specify HostKeyCallback", nil}, + {"correct key", "", testSigners["rsa"].PublicKey()}, + {"mismatch", "mismatch", testSigners["ecdsa"].PublicKey()}, + } { + c1, c2, err := netPipe() + if err != nil { + t.Fatalf("netPipe: %v", err) + } + defer c1.Close() + defer c2.Close() + serverConf := &ServerConfig{ + NoClientAuth: true, + } + serverConf.AddHostKey(testSigners["rsa"]) + + go NewServerConn(c1, serverConf) + clientConf := ClientConfig{ + User: "user", + } + if tt.key != nil { + clientConf.HostKeyCallback = FixedHostKey(tt.key) + } + + _, _, _, err = NewClientConn(c2, "", &clientConf) + if err != nil { + if tt.wantError == "" || !strings.Contains(err.Error(), tt.wantError) { + t.Errorf("%s: got error %q, missing %q", tt.name, err.Error(), tt.wantError) + } + } else if tt.wantError != "" { + t.Errorf("%s: succeeded, but want error string %q", tt.name, tt.wantError) + } + } +} diff --git a/vendor/golang.org/x/crypto/ssh/common.go b/vendor/golang.org/x/crypto/ssh/common.go new file mode 100644 index 0000000..dc39e4d --- /dev/null +++ b/vendor/golang.org/x/crypto/ssh/common.go @@ -0,0 +1,373 @@ +// Copyright 2011 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package ssh + +import ( + "crypto" + "crypto/rand" + "fmt" + "io" + "math" + "sync" + + _ "crypto/sha1" + _ "crypto/sha256" + _ "crypto/sha512" +) + +// These are string constants in the SSH protocol. +const ( + compressionNone = "none" + serviceUserAuth = "ssh-userauth" + serviceSSH = "ssh-connection" +) + +// supportedCiphers specifies the supported ciphers in preference order. +var supportedCiphers = []string{ + "aes128-ctr", "aes192-ctr", "aes256-ctr", + "aes128-gcm@openssh.com", + "arcfour256", "arcfour128", +} + +// supportedKexAlgos specifies the supported key-exchange algorithms in +// preference order. +var supportedKexAlgos = []string{ + kexAlgoCurve25519SHA256, + // P384 and P521 are not constant-time yet, but since we don't + // reuse ephemeral keys, using them for ECDH should be OK. + kexAlgoECDH256, kexAlgoECDH384, kexAlgoECDH521, + kexAlgoDH14SHA1, kexAlgoDH1SHA1, +} + +// supportedHostKeyAlgos specifies the supported host-key algorithms (i.e. methods +// of authenticating servers) in preference order. +var supportedHostKeyAlgos = []string{ + CertAlgoRSAv01, CertAlgoDSAv01, CertAlgoECDSA256v01, + CertAlgoECDSA384v01, CertAlgoECDSA521v01, CertAlgoED25519v01, + + KeyAlgoECDSA256, KeyAlgoECDSA384, KeyAlgoECDSA521, + KeyAlgoRSA, KeyAlgoDSA, + + KeyAlgoED25519, +} + +// supportedMACs specifies a default set of MAC algorithms in preference order. +// This is based on RFC 4253, section 6.4, but with hmac-md5 variants removed +// because they have reached the end of their useful life. +var supportedMACs = []string{ + "hmac-sha2-256-etm@openssh.com", "hmac-sha2-256", "hmac-sha1", "hmac-sha1-96", +} + +var supportedCompressions = []string{compressionNone} + +// hashFuncs keeps the mapping of supported algorithms to their respective +// hashes needed for signature verification. +var hashFuncs = map[string]crypto.Hash{ + KeyAlgoRSA: crypto.SHA1, + KeyAlgoDSA: crypto.SHA1, + KeyAlgoECDSA256: crypto.SHA256, + KeyAlgoECDSA384: crypto.SHA384, + KeyAlgoECDSA521: crypto.SHA512, + CertAlgoRSAv01: crypto.SHA1, + CertAlgoDSAv01: crypto.SHA1, + CertAlgoECDSA256v01: crypto.SHA256, + CertAlgoECDSA384v01: crypto.SHA384, + CertAlgoECDSA521v01: crypto.SHA512, +} + +// unexpectedMessageError results when the SSH message that we received didn't +// match what we wanted. +func unexpectedMessageError(expected, got uint8) error { + return fmt.Errorf("ssh: unexpected message type %d (expected %d)", got, expected) +} + +// parseError results from a malformed SSH message. +func parseError(tag uint8) error { + return fmt.Errorf("ssh: parse error in message type %d", tag) +} + +func findCommon(what string, client []string, server []string) (common string, err error) { + for _, c := range client { + for _, s := range server { + if c == s { + return c, nil + } + } + } + return "", fmt.Errorf("ssh: no common algorithm for %s; client offered: %v, server offered: %v", what, client, server) +} + +type directionAlgorithms struct { + Cipher string + MAC string + Compression string +} + +// rekeyBytes returns a rekeying intervals in bytes. +func (a *directionAlgorithms) rekeyBytes() int64 { + // According to RFC4344 block ciphers should rekey after + // 2^(BLOCKSIZE/4) blocks. For all AES flavors BLOCKSIZE is + // 128. + switch a.Cipher { + case "aes128-ctr", "aes192-ctr", "aes256-ctr", gcmCipherID, aes128cbcID: + return 16 * (1 << 32) + + } + + // For others, stick with RFC4253 recommendation to rekey after 1 Gb of data. + return 1 << 30 +} + +type algorithms struct { + kex string + hostKey string + w directionAlgorithms + r directionAlgorithms +} + +func findAgreedAlgorithms(clientKexInit, serverKexInit *kexInitMsg) (algs *algorithms, err error) { + result := &algorithms{} + + result.kex, err = findCommon("key exchange", clientKexInit.KexAlgos, serverKexInit.KexAlgos) + if err != nil { + return + } + + result.hostKey, err = findCommon("host key", clientKexInit.ServerHostKeyAlgos, serverKexInit.ServerHostKeyAlgos) + if err != nil { + return + } + + result.w.Cipher, err = findCommon("client to server cipher", clientKexInit.CiphersClientServer, serverKexInit.CiphersClientServer) + if err != nil { + return + } + + result.r.Cipher, err = findCommon("server to client cipher", clientKexInit.CiphersServerClient, serverKexInit.CiphersServerClient) + if err != nil { + return + } + + result.w.MAC, err = findCommon("client to server MAC", clientKexInit.MACsClientServer, serverKexInit.MACsClientServer) + if err != nil { + return + } + + result.r.MAC, err = findCommon("server to client MAC", clientKexInit.MACsServerClient, serverKexInit.MACsServerClient) + if err != nil { + return + } + + result.w.Compression, err = findCommon("client to server compression", clientKexInit.CompressionClientServer, serverKexInit.CompressionClientServer) + if err != nil { + return + } + + result.r.Compression, err = findCommon("server to client compression", clientKexInit.CompressionServerClient, serverKexInit.CompressionServerClient) + if err != nil { + return + } + + return result, nil +} + +// If rekeythreshold is too small, we can't make any progress sending +// stuff. +const minRekeyThreshold uint64 = 256 + +// Config contains configuration data common to both ServerConfig and +// ClientConfig. +type Config struct { + // Rand provides the source of entropy for cryptographic + // primitives. If Rand is nil, the cryptographic random reader + // in package crypto/rand will be used. + Rand io.Reader + + // The maximum number of bytes sent or received after which a + // new key is negotiated. It must be at least 256. If + // unspecified, a size suitable for the chosen cipher is used. + RekeyThreshold uint64 + + // The allowed key exchanges algorithms. If unspecified then a + // default set of algorithms is used. + KeyExchanges []string + + // The allowed cipher algorithms. If unspecified then a sensible + // default is used. + Ciphers []string + + // The allowed MAC algorithms. If unspecified then a sensible default + // is used. + MACs []string +} + +// SetDefaults sets sensible values for unset fields in config. This is +// exported for testing: Configs passed to SSH functions are copied and have +// default values set automatically. +func (c *Config) SetDefaults() { + if c.Rand == nil { + c.Rand = rand.Reader + } + if c.Ciphers == nil { + c.Ciphers = supportedCiphers + } + var ciphers []string + for _, c := range c.Ciphers { + if cipherModes[c] != nil { + // reject the cipher if we have no cipherModes definition + ciphers = append(ciphers, c) + } + } + c.Ciphers = ciphers + + if c.KeyExchanges == nil { + c.KeyExchanges = supportedKexAlgos + } + + if c.MACs == nil { + c.MACs = supportedMACs + } + + if c.RekeyThreshold == 0 { + // cipher specific default + } else if c.RekeyThreshold < minRekeyThreshold { + c.RekeyThreshold = minRekeyThreshold + } else if c.RekeyThreshold >= math.MaxInt64 { + // Avoid weirdness if somebody uses -1 as a threshold. + c.RekeyThreshold = math.MaxInt64 + } +} + +// buildDataSignedForAuth returns the data that is signed in order to prove +// possession of a private key. See RFC 4252, section 7. +func buildDataSignedForAuth(sessionId []byte, req userAuthRequestMsg, algo, pubKey []byte) []byte { + data := struct { + Session []byte + Type byte + User string + Service string + Method string + Sign bool + Algo []byte + PubKey []byte + }{ + sessionId, + msgUserAuthRequest, + req.User, + req.Service, + req.Method, + true, + algo, + pubKey, + } + return Marshal(data) +} + +func appendU16(buf []byte, n uint16) []byte { + return append(buf, byte(n>>8), byte(n)) +} + +func appendU32(buf []byte, n uint32) []byte { + return append(buf, byte(n>>24), byte(n>>16), byte(n>>8), byte(n)) +} + +func appendU64(buf []byte, n uint64) []byte { + return append(buf, + byte(n>>56), byte(n>>48), byte(n>>40), byte(n>>32), + byte(n>>24), byte(n>>16), byte(n>>8), byte(n)) +} + +func appendInt(buf []byte, n int) []byte { + return appendU32(buf, uint32(n)) +} + +func appendString(buf []byte, s string) []byte { + buf = appendU32(buf, uint32(len(s))) + buf = append(buf, s...) + return buf +} + +func appendBool(buf []byte, b bool) []byte { + if b { + return append(buf, 1) + } + return append(buf, 0) +} + +// newCond is a helper to hide the fact that there is no usable zero +// value for sync.Cond. +func newCond() *sync.Cond { return sync.NewCond(new(sync.Mutex)) } + +// window represents the buffer available to clients +// wishing to write to a channel. +type window struct { + *sync.Cond + win uint32 // RFC 4254 5.2 says the window size can grow to 2^32-1 + writeWaiters int + closed bool +} + +// add adds win to the amount of window available +// for consumers. +func (w *window) add(win uint32) bool { + // a zero sized window adjust is a noop. + if win == 0 { + return true + } + w.L.Lock() + if w.win+win < win { + w.L.Unlock() + return false + } + w.win += win + // It is unusual that multiple goroutines would be attempting to reserve + // window space, but not guaranteed. Use broadcast to notify all waiters + // that additional window is available. + w.Broadcast() + w.L.Unlock() + return true +} + +// close sets the window to closed, so all reservations fail +// immediately. +func (w *window) close() { + w.L.Lock() + w.closed = true + w.Broadcast() + w.L.Unlock() +} + +// reserve reserves win from the available window capacity. +// If no capacity remains, reserve will block. reserve may +// return less than requested. +func (w *window) reserve(win uint32) (uint32, error) { + var err error + w.L.Lock() + w.writeWaiters++ + w.Broadcast() + for w.win == 0 && !w.closed { + w.Wait() + } + w.writeWaiters-- + if w.win < win { + win = w.win + } + w.win -= win + if w.closed { + err = io.EOF + } + w.L.Unlock() + return win, err +} + +// waitWriterBlocked waits until some goroutine is blocked for further +// writes. It is used in tests only. +func (w *window) waitWriterBlocked() { + w.Cond.L.Lock() + for w.writeWaiters == 0 { + w.Cond.Wait() + } + w.Cond.L.Unlock() +} diff --git a/vendor/golang.org/x/crypto/ssh/connection.go b/vendor/golang.org/x/crypto/ssh/connection.go new file mode 100644 index 0000000..fd6b068 --- /dev/null +++ b/vendor/golang.org/x/crypto/ssh/connection.go @@ -0,0 +1,143 @@ +// Copyright 2013 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package ssh + +import ( + "fmt" + "net" +) + +// OpenChannelError is returned if the other side rejects an +// OpenChannel request. +type OpenChannelError struct { + Reason RejectionReason + Message string +} + +func (e *OpenChannelError) Error() string { + return fmt.Sprintf("ssh: rejected: %s (%s)", e.Reason, e.Message) +} + +// ConnMetadata holds metadata for the connection. +type ConnMetadata interface { + // User returns the user ID for this connection. + User() string + + // SessionID returns the session hash, also denoted by H. + SessionID() []byte + + // ClientVersion returns the client's version string as hashed + // into the session ID. + ClientVersion() []byte + + // ServerVersion returns the server's version string as hashed + // into the session ID. + ServerVersion() []byte + + // RemoteAddr returns the remote address for this connection. + RemoteAddr() net.Addr + + // LocalAddr returns the local address for this connection. + LocalAddr() net.Addr +} + +// Conn represents an SSH connection for both server and client roles. +// Conn is the basis for implementing an application layer, such +// as ClientConn, which implements the traditional shell access for +// clients. +type Conn interface { + ConnMetadata + + // SendRequest sends a global request, and returns the + // reply. If wantReply is true, it returns the response status + // and payload. See also RFC4254, section 4. + SendRequest(name string, wantReply bool, payload []byte) (bool, []byte, error) + + // OpenChannel tries to open an channel. If the request is + // rejected, it returns *OpenChannelError. On success it returns + // the SSH Channel and a Go channel for incoming, out-of-band + // requests. The Go channel must be serviced, or the + // connection will hang. + OpenChannel(name string, data []byte) (Channel, <-chan *Request, error) + + // Close closes the underlying network connection + Close() error + + // Wait blocks until the connection has shut down, and returns the + // error causing the shutdown. + Wait() error + + // TODO(hanwen): consider exposing: + // RequestKeyChange + // Disconnect +} + +// DiscardRequests consumes and rejects all requests from the +// passed-in channel. +func DiscardRequests(in <-chan *Request) { + for req := range in { + if req.WantReply { + req.Reply(false, nil) + } + } +} + +// A connection represents an incoming connection. +type connection struct { + transport *handshakeTransport + sshConn + + // The connection protocol. + *mux +} + +func (c *connection) Close() error { + return c.sshConn.conn.Close() +} + +// sshconn provides net.Conn metadata, but disallows direct reads and +// writes. +type sshConn struct { + conn net.Conn + + user string + sessionID []byte + clientVersion []byte + serverVersion []byte +} + +func dup(src []byte) []byte { + dst := make([]byte, len(src)) + copy(dst, src) + return dst +} + +func (c *sshConn) User() string { + return c.user +} + +func (c *sshConn) RemoteAddr() net.Addr { + return c.conn.RemoteAddr() +} + +func (c *sshConn) Close() error { + return c.conn.Close() +} + +func (c *sshConn) LocalAddr() net.Addr { + return c.conn.LocalAddr() +} + +func (c *sshConn) SessionID() []byte { + return dup(c.sessionID) +} + +func (c *sshConn) ClientVersion() []byte { + return dup(c.clientVersion) +} + +func (c *sshConn) ServerVersion() []byte { + return dup(c.serverVersion) +} diff --git a/vendor/golang.org/x/crypto/ssh/doc.go b/vendor/golang.org/x/crypto/ssh/doc.go new file mode 100644 index 0000000..67b7322 --- /dev/null +++ b/vendor/golang.org/x/crypto/ssh/doc.go @@ -0,0 +1,21 @@ +// Copyright 2011 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +/* +Package ssh implements an SSH client and server. + +SSH is a transport security protocol, an authentication protocol and a +family of application protocols. The most typical application level +protocol is a remote shell and this is specifically implemented. However, +the multiplexed nature of SSH is exposed to users that wish to support +others. + +References: + [PROTOCOL.certkeys]: http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/PROTOCOL.certkeys?rev=HEAD + [SSH-PARAMETERS]: http://www.iana.org/assignments/ssh-parameters/ssh-parameters.xml#ssh-parameters-1 + +This package does not fall under the stability promise of the Go language itself, +so its API may be changed when pressing needs arise. +*/ +package ssh // import "golang.org/x/crypto/ssh" diff --git a/vendor/golang.org/x/crypto/ssh/example_test.go b/vendor/golang.org/x/crypto/ssh/example_test.go new file mode 100644 index 0000000..b910c7b --- /dev/null +++ b/vendor/golang.org/x/crypto/ssh/example_test.go @@ -0,0 +1,320 @@ +// Copyright 2011 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package ssh_test + +import ( + "bufio" + "bytes" + "fmt" + "io/ioutil" + "log" + "net" + "net/http" + "os" + "path/filepath" + "strings" + + "golang.org/x/crypto/ssh" + "golang.org/x/crypto/ssh/terminal" +) + +func ExampleNewServerConn() { + // Public key authentication is done by comparing + // the public key of a received connection + // with the entries in the authorized_keys file. + authorizedKeysBytes, err := ioutil.ReadFile("authorized_keys") + if err != nil { + log.Fatalf("Failed to load authorized_keys, err: %v", err) + } + + authorizedKeysMap := map[string]bool{} + for len(authorizedKeysBytes) > 0 { + pubKey, _, _, rest, err := ssh.ParseAuthorizedKey(authorizedKeysBytes) + if err != nil { + log.Fatal(err) + } + + authorizedKeysMap[string(pubKey.Marshal())] = true + authorizedKeysBytes = rest + } + + // An SSH server is represented by a ServerConfig, which holds + // certificate details and handles authentication of ServerConns. + config := &ssh.ServerConfig{ + // Remove to disable password auth. + PasswordCallback: func(c ssh.ConnMetadata, pass []byte) (*ssh.Permissions, error) { + // Should use constant-time compare (or better, salt+hash) in + // a production setting. + if c.User() == "testuser" && string(pass) == "tiger" { + return nil, nil + } + return nil, fmt.Errorf("password rejected for %q", c.User()) + }, + + // Remove to disable public key auth. + PublicKeyCallback: func(c ssh.ConnMetadata, pubKey ssh.PublicKey) (*ssh.Permissions, error) { + if authorizedKeysMap[string(pubKey.Marshal())] { + return &ssh.Permissions{ + // Record the public key used for authentication. + Extensions: map[string]string{ + "pubkey-fp": ssh.FingerprintSHA256(pubKey), + }, + }, nil + } + return nil, fmt.Errorf("unknown public key for %q", c.User()) + }, + } + + privateBytes, err := ioutil.ReadFile("id_rsa") + if err != nil { + log.Fatal("Failed to load private key: ", err) + } + + private, err := ssh.ParsePrivateKey(privateBytes) + if err != nil { + log.Fatal("Failed to parse private key: ", err) + } + + config.AddHostKey(private) + + // Once a ServerConfig has been configured, connections can be + // accepted. + listener, err := net.Listen("tcp", "0.0.0.0:2022") + if err != nil { + log.Fatal("failed to listen for connection: ", err) + } + nConn, err := listener.Accept() + if err != nil { + log.Fatal("failed to accept incoming connection: ", err) + } + + // Before use, a handshake must be performed on the incoming + // net.Conn. + conn, chans, reqs, err := ssh.NewServerConn(nConn, config) + if err != nil { + log.Fatal("failed to handshake: ", err) + } + log.Printf("logged in with key %s", conn.Permissions.Extensions["pubkey-fp"]) + + // The incoming Request channel must be serviced. + go ssh.DiscardRequests(reqs) + + // Service the incoming Channel channel. + for newChannel := range chans { + // Channels have a type, depending on the application level + // protocol intended. In the case of a shell, the type is + // "session" and ServerShell may be used to present a simple + // terminal interface. + if newChannel.ChannelType() != "session" { + newChannel.Reject(ssh.UnknownChannelType, "unknown channel type") + continue + } + channel, requests, err := newChannel.Accept() + if err != nil { + log.Fatalf("Could not accept channel: %v", err) + } + + // Sessions have out-of-band requests such as "shell", + // "pty-req" and "env". Here we handle only the + // "shell" request. + go func(in <-chan *ssh.Request) { + for req := range in { + req.Reply(req.Type == "shell", nil) + } + }(requests) + + term := terminal.NewTerminal(channel, "> ") + + go func() { + defer channel.Close() + for { + line, err := term.ReadLine() + if err != nil { + break + } + fmt.Println(line) + } + }() + } +} + +func ExampleHostKeyCheck() { + // Every client must provide a host key check. Here is a + // simple-minded parse of OpenSSH's known_hosts file + host := "hostname" + file, err := os.Open(filepath.Join(os.Getenv("HOME"), ".ssh", "known_hosts")) + if err != nil { + log.Fatal(err) + } + defer file.Close() + + scanner := bufio.NewScanner(file) + var hostKey ssh.PublicKey + for scanner.Scan() { + fields := strings.Split(scanner.Text(), " ") + if len(fields) != 3 { + continue + } + if strings.Contains(fields[0], host) { + var err error + hostKey, _, _, _, err = ssh.ParseAuthorizedKey(scanner.Bytes()) + if err != nil { + log.Fatalf("error parsing %q: %v", fields[2], err) + } + break + } + } + + if hostKey == nil { + log.Fatalf("no hostkey for %s", host) + } + + config := ssh.ClientConfig{ + User: os.Getenv("USER"), + HostKeyCallback: ssh.FixedHostKey(hostKey), + } + + _, err = ssh.Dial("tcp", host+":22", &config) + log.Println(err) +} + +func ExampleDial() { + var hostKey ssh.PublicKey + // An SSH client is represented with a ClientConn. + // + // To authenticate with the remote server you must pass at least one + // implementation of AuthMethod via the Auth field in ClientConfig, + // and provide a HostKeyCallback. + config := &ssh.ClientConfig{ + User: "username", + Auth: []ssh.AuthMethod{ + ssh.Password("yourpassword"), + }, + HostKeyCallback: ssh.FixedHostKey(hostKey), + } + client, err := ssh.Dial("tcp", "yourserver.com:22", config) + if err != nil { + log.Fatal("Failed to dial: ", err) + } + + // Each ClientConn can support multiple interactive sessions, + // represented by a Session. + session, err := client.NewSession() + if err != nil { + log.Fatal("Failed to create session: ", err) + } + defer session.Close() + + // Once a Session is created, you can execute a single command on + // the remote side using the Run method. + var b bytes.Buffer + session.Stdout = &b + if err := session.Run("/usr/bin/whoami"); err != nil { + log.Fatal("Failed to run: " + err.Error()) + } + fmt.Println(b.String()) +} + +func ExamplePublicKeys() { + var hostKey ssh.PublicKey + // A public key may be used to authenticate against the remote + // server by using an unencrypted PEM-encoded private key file. + // + // If you have an encrypted private key, the crypto/x509 package + // can be used to decrypt it. + key, err := ioutil.ReadFile("/home/user/.ssh/id_rsa") + if err != nil { + log.Fatalf("unable to read private key: %v", err) + } + + // Create the Signer for this private key. + signer, err := ssh.ParsePrivateKey(key) + if err != nil { + log.Fatalf("unable to parse private key: %v", err) + } + + config := &ssh.ClientConfig{ + User: "user", + Auth: []ssh.AuthMethod{ + // Use the PublicKeys method for remote authentication. + ssh.PublicKeys(signer), + }, + HostKeyCallback: ssh.FixedHostKey(hostKey), + } + + // Connect to the remote server and perform the SSH handshake. + client, err := ssh.Dial("tcp", "host.com:22", config) + if err != nil { + log.Fatalf("unable to connect: %v", err) + } + defer client.Close() +} + +func ExampleClient_Listen() { + var hostKey ssh.PublicKey + config := &ssh.ClientConfig{ + User: "username", + Auth: []ssh.AuthMethod{ + ssh.Password("password"), + }, + HostKeyCallback: ssh.FixedHostKey(hostKey), + } + // Dial your ssh server. + conn, err := ssh.Dial("tcp", "localhost:22", config) + if err != nil { + log.Fatal("unable to connect: ", err) + } + defer conn.Close() + + // Request the remote side to open port 8080 on all interfaces. + l, err := conn.Listen("tcp", "0.0.0.0:8080") + if err != nil { + log.Fatal("unable to register tcp forward: ", err) + } + defer l.Close() + + // Serve HTTP with your SSH server acting as a reverse proxy. + http.Serve(l, http.HandlerFunc(func(resp http.ResponseWriter, req *http.Request) { + fmt.Fprintf(resp, "Hello world!\n") + })) +} + +func ExampleSession_RequestPty() { + var hostKey ssh.PublicKey + // Create client config + config := &ssh.ClientConfig{ + User: "username", + Auth: []ssh.AuthMethod{ + ssh.Password("password"), + }, + HostKeyCallback: ssh.FixedHostKey(hostKey), + } + // Connect to ssh server + conn, err := ssh.Dial("tcp", "localhost:22", config) + if err != nil { + log.Fatal("unable to connect: ", err) + } + defer conn.Close() + // Create a session + session, err := conn.NewSession() + if err != nil { + log.Fatal("unable to create session: ", err) + } + defer session.Close() + // Set up terminal modes + modes := ssh.TerminalModes{ + ssh.ECHO: 0, // disable echoing + ssh.TTY_OP_ISPEED: 14400, // input speed = 14.4kbaud + ssh.TTY_OP_OSPEED: 14400, // output speed = 14.4kbaud + } + // Request pseudo terminal + if err := session.RequestPty("xterm", 40, 80, modes); err != nil { + log.Fatal("request for pseudo terminal failed: ", err) + } + // Start remote shell + if err := session.Shell(); err != nil { + log.Fatal("failed to start shell: ", err) + } +} diff --git a/vendor/golang.org/x/crypto/ssh/handshake.go b/vendor/golang.org/x/crypto/ssh/handshake.go new file mode 100644 index 0000000..932ce83 --- /dev/null +++ b/vendor/golang.org/x/crypto/ssh/handshake.go @@ -0,0 +1,640 @@ +// Copyright 2013 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package ssh + +import ( + "crypto/rand" + "errors" + "fmt" + "io" + "log" + "net" + "sync" +) + +// debugHandshake, if set, prints messages sent and received. Key +// exchange messages are printed as if DH were used, so the debug +// messages are wrong when using ECDH. +const debugHandshake = false + +// chanSize sets the amount of buffering SSH connections. This is +// primarily for testing: setting chanSize=0 uncovers deadlocks more +// quickly. +const chanSize = 16 + +// keyingTransport is a packet based transport that supports key +// changes. It need not be thread-safe. It should pass through +// msgNewKeys in both directions. +type keyingTransport interface { + packetConn + + // prepareKeyChange sets up a key change. The key change for a + // direction will be effected if a msgNewKeys message is sent + // or received. + prepareKeyChange(*algorithms, *kexResult) error +} + +// handshakeTransport implements rekeying on top of a keyingTransport +// and offers a thread-safe writePacket() interface. +type handshakeTransport struct { + conn keyingTransport + config *Config + + serverVersion []byte + clientVersion []byte + + // hostKeys is non-empty if we are the server. In that case, + // it contains all host keys that can be used to sign the + // connection. + hostKeys []Signer + + // hostKeyAlgorithms is non-empty if we are the client. In that case, + // we accept these key types from the server as host key. + hostKeyAlgorithms []string + + // On read error, incoming is closed, and readError is set. + incoming chan []byte + readError error + + mu sync.Mutex + writeError error + sentInitPacket []byte + sentInitMsg *kexInitMsg + pendingPackets [][]byte // Used when a key exchange is in progress. + + // If the read loop wants to schedule a kex, it pings this + // channel, and the write loop will send out a kex + // message. + requestKex chan struct{} + + // If the other side requests or confirms a kex, its kexInit + // packet is sent here for the write loop to find it. + startKex chan *pendingKex + + // data for host key checking + hostKeyCallback HostKeyCallback + dialAddress string + remoteAddr net.Addr + + // Algorithms agreed in the last key exchange. + algorithms *algorithms + + readPacketsLeft uint32 + readBytesLeft int64 + + writePacketsLeft uint32 + writeBytesLeft int64 + + // The session ID or nil if first kex did not complete yet. + sessionID []byte +} + +type pendingKex struct { + otherInit []byte + done chan error +} + +func newHandshakeTransport(conn keyingTransport, config *Config, clientVersion, serverVersion []byte) *handshakeTransport { + t := &handshakeTransport{ + conn: conn, + serverVersion: serverVersion, + clientVersion: clientVersion, + incoming: make(chan []byte, chanSize), + requestKex: make(chan struct{}, 1), + startKex: make(chan *pendingKex, 1), + + config: config, + } + t.resetReadThresholds() + t.resetWriteThresholds() + + // We always start with a mandatory key exchange. + t.requestKex <- struct{}{} + return t +} + +func newClientTransport(conn keyingTransport, clientVersion, serverVersion []byte, config *ClientConfig, dialAddr string, addr net.Addr) *handshakeTransport { + t := newHandshakeTransport(conn, &config.Config, clientVersion, serverVersion) + t.dialAddress = dialAddr + t.remoteAddr = addr + t.hostKeyCallback = config.HostKeyCallback + if config.HostKeyAlgorithms != nil { + t.hostKeyAlgorithms = config.HostKeyAlgorithms + } else { + t.hostKeyAlgorithms = supportedHostKeyAlgos + } + go t.readLoop() + go t.kexLoop() + return t +} + +func newServerTransport(conn keyingTransport, clientVersion, serverVersion []byte, config *ServerConfig) *handshakeTransport { + t := newHandshakeTransport(conn, &config.Config, clientVersion, serverVersion) + t.hostKeys = config.hostKeys + go t.readLoop() + go t.kexLoop() + return t +} + +func (t *handshakeTransport) getSessionID() []byte { + return t.sessionID +} + +// waitSession waits for the session to be established. This should be +// the first thing to call after instantiating handshakeTransport. +func (t *handshakeTransport) waitSession() error { + p, err := t.readPacket() + if err != nil { + return err + } + if p[0] != msgNewKeys { + return fmt.Errorf("ssh: first packet should be msgNewKeys") + } + + return nil +} + +func (t *handshakeTransport) id() string { + if len(t.hostKeys) > 0 { + return "server" + } + return "client" +} + +func (t *handshakeTransport) printPacket(p []byte, write bool) { + action := "got" + if write { + action = "sent" + } + + if p[0] == msgChannelData || p[0] == msgChannelExtendedData { + log.Printf("%s %s data (packet %d bytes)", t.id(), action, len(p)) + } else { + msg, err := decode(p) + log.Printf("%s %s %T %v (%v)", t.id(), action, msg, msg, err) + } +} + +func (t *handshakeTransport) readPacket() ([]byte, error) { + p, ok := <-t.incoming + if !ok { + return nil, t.readError + } + return p, nil +} + +func (t *handshakeTransport) readLoop() { + first := true + for { + p, err := t.readOnePacket(first) + first = false + if err != nil { + t.readError = err + close(t.incoming) + break + } + if p[0] == msgIgnore || p[0] == msgDebug { + continue + } + t.incoming <- p + } + + // Stop writers too. + t.recordWriteError(t.readError) + + // Unblock the writer should it wait for this. + close(t.startKex) + + // Don't close t.requestKex; it's also written to from writePacket. +} + +func (t *handshakeTransport) pushPacket(p []byte) error { + if debugHandshake { + t.printPacket(p, true) + } + return t.conn.writePacket(p) +} + +func (t *handshakeTransport) getWriteError() error { + t.mu.Lock() + defer t.mu.Unlock() + return t.writeError +} + +func (t *handshakeTransport) recordWriteError(err error) { + t.mu.Lock() + defer t.mu.Unlock() + if t.writeError == nil && err != nil { + t.writeError = err + } +} + +func (t *handshakeTransport) requestKeyExchange() { + select { + case t.requestKex <- struct{}{}: + default: + // something already requested a kex, so do nothing. + } +} + +func (t *handshakeTransport) resetWriteThresholds() { + t.writePacketsLeft = packetRekeyThreshold + if t.config.RekeyThreshold > 0 { + t.writeBytesLeft = int64(t.config.RekeyThreshold) + } else if t.algorithms != nil { + t.writeBytesLeft = t.algorithms.w.rekeyBytes() + } else { + t.writeBytesLeft = 1 << 30 + } +} + +func (t *handshakeTransport) kexLoop() { + +write: + for t.getWriteError() == nil { + var request *pendingKex + var sent bool + + for request == nil || !sent { + var ok bool + select { + case request, ok = <-t.startKex: + if !ok { + break write + } + case <-t.requestKex: + break + } + + if !sent { + if err := t.sendKexInit(); err != nil { + t.recordWriteError(err) + break + } + sent = true + } + } + + if err := t.getWriteError(); err != nil { + if request != nil { + request.done <- err + } + break + } + + // We're not servicing t.requestKex, but that is OK: + // we never block on sending to t.requestKex. + + // We're not servicing t.startKex, but the remote end + // has just sent us a kexInitMsg, so it can't send + // another key change request, until we close the done + // channel on the pendingKex request. + + err := t.enterKeyExchange(request.otherInit) + + t.mu.Lock() + t.writeError = err + t.sentInitPacket = nil + t.sentInitMsg = nil + + t.resetWriteThresholds() + + // we have completed the key exchange. Since the + // reader is still blocked, it is safe to clear out + // the requestKex channel. This avoids the situation + // where: 1) we consumed our own request for the + // initial kex, and 2) the kex from the remote side + // caused another send on the requestKex channel, + clear: + for { + select { + case <-t.requestKex: + // + default: + break clear + } + } + + request.done <- t.writeError + + // kex finished. Push packets that we received while + // the kex was in progress. Don't look at t.startKex + // and don't increment writtenSinceKex: if we trigger + // another kex while we are still busy with the last + // one, things will become very confusing. + for _, p := range t.pendingPackets { + t.writeError = t.pushPacket(p) + if t.writeError != nil { + break + } + } + t.pendingPackets = t.pendingPackets[:0] + t.mu.Unlock() + } + + // drain startKex channel. We don't service t.requestKex + // because nobody does blocking sends there. + go func() { + for init := range t.startKex { + init.done <- t.writeError + } + }() + + // Unblock reader. + t.conn.Close() +} + +// The protocol uses uint32 for packet counters, so we can't let them +// reach 1<<32. We will actually read and write more packets than +// this, though: the other side may send more packets, and after we +// hit this limit on writing we will send a few more packets for the +// key exchange itself. +const packetRekeyThreshold = (1 << 31) + +func (t *handshakeTransport) resetReadThresholds() { + t.readPacketsLeft = packetRekeyThreshold + if t.config.RekeyThreshold > 0 { + t.readBytesLeft = int64(t.config.RekeyThreshold) + } else if t.algorithms != nil { + t.readBytesLeft = t.algorithms.r.rekeyBytes() + } else { + t.readBytesLeft = 1 << 30 + } +} + +func (t *handshakeTransport) readOnePacket(first bool) ([]byte, error) { + p, err := t.conn.readPacket() + if err != nil { + return nil, err + } + + if t.readPacketsLeft > 0 { + t.readPacketsLeft-- + } else { + t.requestKeyExchange() + } + + if t.readBytesLeft > 0 { + t.readBytesLeft -= int64(len(p)) + } else { + t.requestKeyExchange() + } + + if debugHandshake { + t.printPacket(p, false) + } + + if first && p[0] != msgKexInit { + return nil, fmt.Errorf("ssh: first packet should be msgKexInit") + } + + if p[0] != msgKexInit { + return p, nil + } + + firstKex := t.sessionID == nil + + kex := pendingKex{ + done: make(chan error, 1), + otherInit: p, + } + t.startKex <- &kex + err = <-kex.done + + if debugHandshake { + log.Printf("%s exited key exchange (first %v), err %v", t.id(), firstKex, err) + } + + if err != nil { + return nil, err + } + + t.resetReadThresholds() + + // By default, a key exchange is hidden from higher layers by + // translating it into msgIgnore. + successPacket := []byte{msgIgnore} + if firstKex { + // sendKexInit() for the first kex waits for + // msgNewKeys so the authentication process is + // guaranteed to happen over an encrypted transport. + successPacket = []byte{msgNewKeys} + } + + return successPacket, nil +} + +// sendKexInit sends a key change message. +func (t *handshakeTransport) sendKexInit() error { + t.mu.Lock() + defer t.mu.Unlock() + if t.sentInitMsg != nil { + // kexInits may be sent either in response to the other side, + // or because our side wants to initiate a key change, so we + // may have already sent a kexInit. In that case, don't send a + // second kexInit. + return nil + } + + msg := &kexInitMsg{ + KexAlgos: t.config.KeyExchanges, + CiphersClientServer: t.config.Ciphers, + CiphersServerClient: t.config.Ciphers, + MACsClientServer: t.config.MACs, + MACsServerClient: t.config.MACs, + CompressionClientServer: supportedCompressions, + CompressionServerClient: supportedCompressions, + } + io.ReadFull(rand.Reader, msg.Cookie[:]) + + if len(t.hostKeys) > 0 { + for _, k := range t.hostKeys { + msg.ServerHostKeyAlgos = append( + msg.ServerHostKeyAlgos, k.PublicKey().Type()) + } + } else { + msg.ServerHostKeyAlgos = t.hostKeyAlgorithms + } + packet := Marshal(msg) + + // writePacket destroys the contents, so save a copy. + packetCopy := make([]byte, len(packet)) + copy(packetCopy, packet) + + if err := t.pushPacket(packetCopy); err != nil { + return err + } + + t.sentInitMsg = msg + t.sentInitPacket = packet + + return nil +} + +func (t *handshakeTransport) writePacket(p []byte) error { + switch p[0] { + case msgKexInit: + return errors.New("ssh: only handshakeTransport can send kexInit") + case msgNewKeys: + return errors.New("ssh: only handshakeTransport can send newKeys") + } + + t.mu.Lock() + defer t.mu.Unlock() + if t.writeError != nil { + return t.writeError + } + + if t.sentInitMsg != nil { + // Copy the packet so the writer can reuse the buffer. + cp := make([]byte, len(p)) + copy(cp, p) + t.pendingPackets = append(t.pendingPackets, cp) + return nil + } + + if t.writeBytesLeft > 0 { + t.writeBytesLeft -= int64(len(p)) + } else { + t.requestKeyExchange() + } + + if t.writePacketsLeft > 0 { + t.writePacketsLeft-- + } else { + t.requestKeyExchange() + } + + if err := t.pushPacket(p); err != nil { + t.writeError = err + } + + return nil +} + +func (t *handshakeTransport) Close() error { + return t.conn.Close() +} + +func (t *handshakeTransport) enterKeyExchange(otherInitPacket []byte) error { + if debugHandshake { + log.Printf("%s entered key exchange", t.id()) + } + + otherInit := &kexInitMsg{} + if err := Unmarshal(otherInitPacket, otherInit); err != nil { + return err + } + + magics := handshakeMagics{ + clientVersion: t.clientVersion, + serverVersion: t.serverVersion, + clientKexInit: otherInitPacket, + serverKexInit: t.sentInitPacket, + } + + clientInit := otherInit + serverInit := t.sentInitMsg + if len(t.hostKeys) == 0 { + clientInit, serverInit = serverInit, clientInit + + magics.clientKexInit = t.sentInitPacket + magics.serverKexInit = otherInitPacket + } + + var err error + t.algorithms, err = findAgreedAlgorithms(clientInit, serverInit) + if err != nil { + return err + } + + // We don't send FirstKexFollows, but we handle receiving it. + // + // RFC 4253 section 7 defines the kex and the agreement method for + // first_kex_packet_follows. It states that the guessed packet + // should be ignored if the "kex algorithm and/or the host + // key algorithm is guessed wrong (server and client have + // different preferred algorithm), or if any of the other + // algorithms cannot be agreed upon". The other algorithms have + // already been checked above so the kex algorithm and host key + // algorithm are checked here. + if otherInit.FirstKexFollows && (clientInit.KexAlgos[0] != serverInit.KexAlgos[0] || clientInit.ServerHostKeyAlgos[0] != serverInit.ServerHostKeyAlgos[0]) { + // other side sent a kex message for the wrong algorithm, + // which we have to ignore. + if _, err := t.conn.readPacket(); err != nil { + return err + } + } + + kex, ok := kexAlgoMap[t.algorithms.kex] + if !ok { + return fmt.Errorf("ssh: unexpected key exchange algorithm %v", t.algorithms.kex) + } + + var result *kexResult + if len(t.hostKeys) > 0 { + result, err = t.server(kex, t.algorithms, &magics) + } else { + result, err = t.client(kex, t.algorithms, &magics) + } + + if err != nil { + return err + } + + if t.sessionID == nil { + t.sessionID = result.H + } + result.SessionID = t.sessionID + + if err := t.conn.prepareKeyChange(t.algorithms, result); err != nil { + return err + } + if err = t.conn.writePacket([]byte{msgNewKeys}); err != nil { + return err + } + if packet, err := t.conn.readPacket(); err != nil { + return err + } else if packet[0] != msgNewKeys { + return unexpectedMessageError(msgNewKeys, packet[0]) + } + + return nil +} + +func (t *handshakeTransport) server(kex kexAlgorithm, algs *algorithms, magics *handshakeMagics) (*kexResult, error) { + var hostKey Signer + for _, k := range t.hostKeys { + if algs.hostKey == k.PublicKey().Type() { + hostKey = k + } + } + + r, err := kex.Server(t.conn, t.config.Rand, magics, hostKey) + return r, err +} + +func (t *handshakeTransport) client(kex kexAlgorithm, algs *algorithms, magics *handshakeMagics) (*kexResult, error) { + result, err := kex.Client(t.conn, t.config.Rand, magics) + if err != nil { + return nil, err + } + + hostKey, err := ParsePublicKey(result.HostKey) + if err != nil { + return nil, err + } + + if err := verifyHostKeySignature(hostKey, result); err != nil { + return nil, err + } + + err = t.hostKeyCallback(t.dialAddress, t.remoteAddr, hostKey) + if err != nil { + return nil, err + } + + return result, nil +} diff --git a/vendor/golang.org/x/crypto/ssh/handshake_test.go b/vendor/golang.org/x/crypto/ssh/handshake_test.go new file mode 100644 index 0000000..91d4935 --- /dev/null +++ b/vendor/golang.org/x/crypto/ssh/handshake_test.go @@ -0,0 +1,559 @@ +// Copyright 2013 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package ssh + +import ( + "bytes" + "crypto/rand" + "errors" + "fmt" + "io" + "net" + "reflect" + "runtime" + "strings" + "sync" + "testing" +) + +type testChecker struct { + calls []string +} + +func (t *testChecker) Check(dialAddr string, addr net.Addr, key PublicKey) error { + if dialAddr == "bad" { + return fmt.Errorf("dialAddr is bad") + } + + if tcpAddr, ok := addr.(*net.TCPAddr); !ok || tcpAddr == nil { + return fmt.Errorf("testChecker: got %T want *net.TCPAddr", addr) + } + + t.calls = append(t.calls, fmt.Sprintf("%s %v %s %x", dialAddr, addr, key.Type(), key.Marshal())) + + return nil +} + +// netPipe is analogous to net.Pipe, but it uses a real net.Conn, and +// therefore is buffered (net.Pipe deadlocks if both sides start with +// a write.) +func netPipe() (net.Conn, net.Conn, error) { + listener, err := net.Listen("tcp", "127.0.0.1:0") + if err != nil { + listener, err = net.Listen("tcp", "[::1]:0") + if err != nil { + return nil, nil, err + } + } + defer listener.Close() + c1, err := net.Dial("tcp", listener.Addr().String()) + if err != nil { + return nil, nil, err + } + + c2, err := listener.Accept() + if err != nil { + c1.Close() + return nil, nil, err + } + + return c1, c2, nil +} + +// noiseTransport inserts ignore messages to check that the read loop +// and the key exchange filters out these messages. +type noiseTransport struct { + keyingTransport +} + +func (t *noiseTransport) writePacket(p []byte) error { + ignore := []byte{msgIgnore} + if err := t.keyingTransport.writePacket(ignore); err != nil { + return err + } + debug := []byte{msgDebug, 1, 2, 3} + if err := t.keyingTransport.writePacket(debug); err != nil { + return err + } + + return t.keyingTransport.writePacket(p) +} + +func addNoiseTransport(t keyingTransport) keyingTransport { + return &noiseTransport{t} +} + +// handshakePair creates two handshakeTransports connected with each +// other. If the noise argument is true, both transports will try to +// confuse the other side by sending ignore and debug messages. +func handshakePair(clientConf *ClientConfig, addr string, noise bool) (client *handshakeTransport, server *handshakeTransport, err error) { + a, b, err := netPipe() + if err != nil { + return nil, nil, err + } + + var trC, trS keyingTransport + + trC = newTransport(a, rand.Reader, true) + trS = newTransport(b, rand.Reader, false) + if noise { + trC = addNoiseTransport(trC) + trS = addNoiseTransport(trS) + } + clientConf.SetDefaults() + + v := []byte("version") + client = newClientTransport(trC, v, v, clientConf, addr, a.RemoteAddr()) + + serverConf := &ServerConfig{} + serverConf.AddHostKey(testSigners["ecdsa"]) + serverConf.AddHostKey(testSigners["rsa"]) + serverConf.SetDefaults() + server = newServerTransport(trS, v, v, serverConf) + + if err := server.waitSession(); err != nil { + return nil, nil, fmt.Errorf("server.waitSession: %v", err) + } + if err := client.waitSession(); err != nil { + return nil, nil, fmt.Errorf("client.waitSession: %v", err) + } + + return client, server, nil +} + +func TestHandshakeBasic(t *testing.T) { + if runtime.GOOS == "plan9" { + t.Skip("see golang.org/issue/7237") + } + + checker := &syncChecker{ + waitCall: make(chan int, 10), + called: make(chan int, 10), + } + + checker.waitCall <- 1 + trC, trS, err := handshakePair(&ClientConfig{HostKeyCallback: checker.Check}, "addr", false) + if err != nil { + t.Fatalf("handshakePair: %v", err) + } + + defer trC.Close() + defer trS.Close() + + // Let first kex complete normally. + <-checker.called + + clientDone := make(chan int, 0) + gotHalf := make(chan int, 0) + const N = 20 + + go func() { + defer close(clientDone) + // Client writes a bunch of stuff, and does a key + // change in the middle. This should not confuse the + // handshake in progress. We do this twice, so we test + // that the packet buffer is reset correctly. + for i := 0; i < N; i++ { + p := []byte{msgRequestSuccess, byte(i)} + if err := trC.writePacket(p); err != nil { + t.Fatalf("sendPacket: %v", err) + } + if (i % 10) == 5 { + <-gotHalf + // halfway through, we request a key change. + trC.requestKeyExchange() + + // Wait until we can be sure the key + // change has really started before we + // write more. + <-checker.called + } + if (i % 10) == 7 { + // write some packets until the kex + // completes, to test buffering of + // packets. + checker.waitCall <- 1 + } + } + }() + + // Server checks that client messages come in cleanly + i := 0 + err = nil + for ; i < N; i++ { + var p []byte + p, err = trS.readPacket() + if err != nil { + break + } + if (i % 10) == 5 { + gotHalf <- 1 + } + + want := []byte{msgRequestSuccess, byte(i)} + if bytes.Compare(p, want) != 0 { + t.Errorf("message %d: got %v, want %v", i, p, want) + } + } + <-clientDone + if err != nil && err != io.EOF { + t.Fatalf("server error: %v", err) + } + if i != N { + t.Errorf("received %d messages, want 10.", i) + } + + close(checker.called) + if _, ok := <-checker.called; ok { + // If all went well, we registered exactly 2 key changes: one + // that establishes the session, and one that we requested + // additionally. + t.Fatalf("got another host key checks after 2 handshakes") + } +} + +func TestForceFirstKex(t *testing.T) { + // like handshakePair, but must access the keyingTransport. + checker := &testChecker{} + clientConf := &ClientConfig{HostKeyCallback: checker.Check} + a, b, err := netPipe() + if err != nil { + t.Fatalf("netPipe: %v", err) + } + + var trC, trS keyingTransport + + trC = newTransport(a, rand.Reader, true) + + // This is the disallowed packet: + trC.writePacket(Marshal(&serviceRequestMsg{serviceUserAuth})) + + // Rest of the setup. + trS = newTransport(b, rand.Reader, false) + clientConf.SetDefaults() + + v := []byte("version") + client := newClientTransport(trC, v, v, clientConf, "addr", a.RemoteAddr()) + + serverConf := &ServerConfig{} + serverConf.AddHostKey(testSigners["ecdsa"]) + serverConf.AddHostKey(testSigners["rsa"]) + serverConf.SetDefaults() + server := newServerTransport(trS, v, v, serverConf) + + defer client.Close() + defer server.Close() + + // We setup the initial key exchange, but the remote side + // tries to send serviceRequestMsg in cleartext, which is + // disallowed. + + if err := server.waitSession(); err == nil { + t.Errorf("server first kex init should reject unexpected packet") + } +} + +func TestHandshakeAutoRekeyWrite(t *testing.T) { + checker := &syncChecker{ + called: make(chan int, 10), + waitCall: nil, + } + clientConf := &ClientConfig{HostKeyCallback: checker.Check} + clientConf.RekeyThreshold = 500 + trC, trS, err := handshakePair(clientConf, "addr", false) + if err != nil { + t.Fatalf("handshakePair: %v", err) + } + defer trC.Close() + defer trS.Close() + + input := make([]byte, 251) + input[0] = msgRequestSuccess + + done := make(chan int, 1) + const numPacket = 5 + go func() { + defer close(done) + j := 0 + for ; j < numPacket; j++ { + if p, err := trS.readPacket(); err != nil { + break + } else if !bytes.Equal(input, p) { + t.Errorf("got packet type %d, want %d", p[0], input[0]) + } + } + + if j != numPacket { + t.Errorf("got %d, want 5 messages", j) + } + }() + + <-checker.called + + for i := 0; i < numPacket; i++ { + p := make([]byte, len(input)) + copy(p, input) + if err := trC.writePacket(p); err != nil { + t.Errorf("writePacket: %v", err) + } + if i == 2 { + // Make sure the kex is in progress. + <-checker.called + } + + } + <-done +} + +type syncChecker struct { + waitCall chan int + called chan int +} + +func (c *syncChecker) Check(dialAddr string, addr net.Addr, key PublicKey) error { + c.called <- 1 + if c.waitCall != nil { + <-c.waitCall + } + return nil +} + +func TestHandshakeAutoRekeyRead(t *testing.T) { + sync := &syncChecker{ + called: make(chan int, 2), + waitCall: nil, + } + clientConf := &ClientConfig{ + HostKeyCallback: sync.Check, + } + clientConf.RekeyThreshold = 500 + + trC, trS, err := handshakePair(clientConf, "addr", false) + if err != nil { + t.Fatalf("handshakePair: %v", err) + } + defer trC.Close() + defer trS.Close() + + packet := make([]byte, 501) + packet[0] = msgRequestSuccess + if err := trS.writePacket(packet); err != nil { + t.Fatalf("writePacket: %v", err) + } + + // While we read out the packet, a key change will be + // initiated. + done := make(chan int, 1) + go func() { + defer close(done) + if _, err := trC.readPacket(); err != nil { + t.Fatalf("readPacket(client): %v", err) + } + + }() + + <-done + <-sync.called +} + +// errorKeyingTransport generates errors after a given number of +// read/write operations. +type errorKeyingTransport struct { + packetConn + readLeft, writeLeft int +} + +func (n *errorKeyingTransport) prepareKeyChange(*algorithms, *kexResult) error { + return nil +} + +func (n *errorKeyingTransport) getSessionID() []byte { + return nil +} + +func (n *errorKeyingTransport) writePacket(packet []byte) error { + if n.writeLeft == 0 { + n.Close() + return errors.New("barf") + } + + n.writeLeft-- + return n.packetConn.writePacket(packet) +} + +func (n *errorKeyingTransport) readPacket() ([]byte, error) { + if n.readLeft == 0 { + n.Close() + return nil, errors.New("barf") + } + + n.readLeft-- + return n.packetConn.readPacket() +} + +func TestHandshakeErrorHandlingRead(t *testing.T) { + for i := 0; i < 20; i++ { + testHandshakeErrorHandlingN(t, i, -1, false) + } +} + +func TestHandshakeErrorHandlingWrite(t *testing.T) { + for i := 0; i < 20; i++ { + testHandshakeErrorHandlingN(t, -1, i, false) + } +} + +func TestHandshakeErrorHandlingReadCoupled(t *testing.T) { + for i := 0; i < 20; i++ { + testHandshakeErrorHandlingN(t, i, -1, true) + } +} + +func TestHandshakeErrorHandlingWriteCoupled(t *testing.T) { + for i := 0; i < 20; i++ { + testHandshakeErrorHandlingN(t, -1, i, true) + } +} + +// testHandshakeErrorHandlingN runs handshakes, injecting errors. If +// handshakeTransport deadlocks, the go runtime will detect it and +// panic. +func testHandshakeErrorHandlingN(t *testing.T, readLimit, writeLimit int, coupled bool) { + msg := Marshal(&serviceRequestMsg{strings.Repeat("x", int(minRekeyThreshold)/4)}) + + a, b := memPipe() + defer a.Close() + defer b.Close() + + key := testSigners["ecdsa"] + serverConf := Config{RekeyThreshold: minRekeyThreshold} + serverConf.SetDefaults() + serverConn := newHandshakeTransport(&errorKeyingTransport{a, readLimit, writeLimit}, &serverConf, []byte{'a'}, []byte{'b'}) + serverConn.hostKeys = []Signer{key} + go serverConn.readLoop() + go serverConn.kexLoop() + + clientConf := Config{RekeyThreshold: 10 * minRekeyThreshold} + clientConf.SetDefaults() + clientConn := newHandshakeTransport(&errorKeyingTransport{b, -1, -1}, &clientConf, []byte{'a'}, []byte{'b'}) + clientConn.hostKeyAlgorithms = []string{key.PublicKey().Type()} + clientConn.hostKeyCallback = InsecureIgnoreHostKey() + go clientConn.readLoop() + go clientConn.kexLoop() + + var wg sync.WaitGroup + + for _, hs := range []packetConn{serverConn, clientConn} { + if !coupled { + wg.Add(2) + go func(c packetConn) { + for i := 0; ; i++ { + str := fmt.Sprintf("%08x", i) + strings.Repeat("x", int(minRekeyThreshold)/4-8) + err := c.writePacket(Marshal(&serviceRequestMsg{str})) + if err != nil { + break + } + } + wg.Done() + c.Close() + }(hs) + go func(c packetConn) { + for { + _, err := c.readPacket() + if err != nil { + break + } + } + wg.Done() + }(hs) + } else { + wg.Add(1) + go func(c packetConn) { + for { + _, err := c.readPacket() + if err != nil { + break + } + if err := c.writePacket(msg); err != nil { + break + } + + } + wg.Done() + }(hs) + } + } + wg.Wait() +} + +func TestDisconnect(t *testing.T) { + if runtime.GOOS == "plan9" { + t.Skip("see golang.org/issue/7237") + } + checker := &testChecker{} + trC, trS, err := handshakePair(&ClientConfig{HostKeyCallback: checker.Check}, "addr", false) + if err != nil { + t.Fatalf("handshakePair: %v", err) + } + + defer trC.Close() + defer trS.Close() + + trC.writePacket([]byte{msgRequestSuccess, 0, 0}) + errMsg := &disconnectMsg{ + Reason: 42, + Message: "such is life", + } + trC.writePacket(Marshal(errMsg)) + trC.writePacket([]byte{msgRequestSuccess, 0, 0}) + + packet, err := trS.readPacket() + if err != nil { + t.Fatalf("readPacket 1: %v", err) + } + if packet[0] != msgRequestSuccess { + t.Errorf("got packet %v, want packet type %d", packet, msgRequestSuccess) + } + + _, err = trS.readPacket() + if err == nil { + t.Errorf("readPacket 2 succeeded") + } else if !reflect.DeepEqual(err, errMsg) { + t.Errorf("got error %#v, want %#v", err, errMsg) + } + + _, err = trS.readPacket() + if err == nil { + t.Errorf("readPacket 3 succeeded") + } +} + +func TestHandshakeRekeyDefault(t *testing.T) { + clientConf := &ClientConfig{ + Config: Config{ + Ciphers: []string{"aes128-ctr"}, + }, + HostKeyCallback: InsecureIgnoreHostKey(), + } + trC, trS, err := handshakePair(clientConf, "addr", false) + if err != nil { + t.Fatalf("handshakePair: %v", err) + } + defer trC.Close() + defer trS.Close() + + trC.writePacket([]byte{msgRequestSuccess, 0, 0}) + trC.Close() + + rgb := (1024 + trC.readBytesLeft) >> 30 + wgb := (1024 + trC.writeBytesLeft) >> 30 + + if rgb != 64 { + t.Errorf("got rekey after %dG read, want 64G", rgb) + } + if wgb != 64 { + t.Errorf("got rekey after %dG write, want 64G", wgb) + } +} diff --git a/vendor/golang.org/x/crypto/ssh/kex.go b/vendor/golang.org/x/crypto/ssh/kex.go new file mode 100644 index 0000000..f91c277 --- /dev/null +++ b/vendor/golang.org/x/crypto/ssh/kex.go @@ -0,0 +1,540 @@ +// Copyright 2013 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package ssh + +import ( + "crypto" + "crypto/ecdsa" + "crypto/elliptic" + "crypto/rand" + "crypto/subtle" + "errors" + "io" + "math/big" + + "golang.org/x/crypto/curve25519" +) + +const ( + kexAlgoDH1SHA1 = "diffie-hellman-group1-sha1" + kexAlgoDH14SHA1 = "diffie-hellman-group14-sha1" + kexAlgoECDH256 = "ecdh-sha2-nistp256" + kexAlgoECDH384 = "ecdh-sha2-nistp384" + kexAlgoECDH521 = "ecdh-sha2-nistp521" + kexAlgoCurve25519SHA256 = "curve25519-sha256@libssh.org" +) + +// kexResult captures the outcome of a key exchange. +type kexResult struct { + // Session hash. See also RFC 4253, section 8. + H []byte + + // Shared secret. See also RFC 4253, section 8. + K []byte + + // Host key as hashed into H. + HostKey []byte + + // Signature of H. + Signature []byte + + // A cryptographic hash function that matches the security + // level of the key exchange algorithm. It is used for + // calculating H, and for deriving keys from H and K. + Hash crypto.Hash + + // The session ID, which is the first H computed. This is used + // to derive key material inside the transport. + SessionID []byte +} + +// handshakeMagics contains data that is always included in the +// session hash. +type handshakeMagics struct { + clientVersion, serverVersion []byte + clientKexInit, serverKexInit []byte +} + +func (m *handshakeMagics) write(w io.Writer) { + writeString(w, m.clientVersion) + writeString(w, m.serverVersion) + writeString(w, m.clientKexInit) + writeString(w, m.serverKexInit) +} + +// kexAlgorithm abstracts different key exchange algorithms. +type kexAlgorithm interface { + // Server runs server-side key agreement, signing the result + // with a hostkey. + Server(p packetConn, rand io.Reader, magics *handshakeMagics, s Signer) (*kexResult, error) + + // Client runs the client-side key agreement. Caller is + // responsible for verifying the host key signature. + Client(p packetConn, rand io.Reader, magics *handshakeMagics) (*kexResult, error) +} + +// dhGroup is a multiplicative group suitable for implementing Diffie-Hellman key agreement. +type dhGroup struct { + g, p, pMinus1 *big.Int +} + +func (group *dhGroup) diffieHellman(theirPublic, myPrivate *big.Int) (*big.Int, error) { + if theirPublic.Cmp(bigOne) <= 0 || theirPublic.Cmp(group.pMinus1) >= 0 { + return nil, errors.New("ssh: DH parameter out of bounds") + } + return new(big.Int).Exp(theirPublic, myPrivate, group.p), nil +} + +func (group *dhGroup) Client(c packetConn, randSource io.Reader, magics *handshakeMagics) (*kexResult, error) { + hashFunc := crypto.SHA1 + + var x *big.Int + for { + var err error + if x, err = rand.Int(randSource, group.pMinus1); err != nil { + return nil, err + } + if x.Sign() > 0 { + break + } + } + + X := new(big.Int).Exp(group.g, x, group.p) + kexDHInit := kexDHInitMsg{ + X: X, + } + if err := c.writePacket(Marshal(&kexDHInit)); err != nil { + return nil, err + } + + packet, err := c.readPacket() + if err != nil { + return nil, err + } + + var kexDHReply kexDHReplyMsg + if err = Unmarshal(packet, &kexDHReply); err != nil { + return nil, err + } + + kInt, err := group.diffieHellman(kexDHReply.Y, x) + if err != nil { + return nil, err + } + + h := hashFunc.New() + magics.write(h) + writeString(h, kexDHReply.HostKey) + writeInt(h, X) + writeInt(h, kexDHReply.Y) + K := make([]byte, intLength(kInt)) + marshalInt(K, kInt) + h.Write(K) + + return &kexResult{ + H: h.Sum(nil), + K: K, + HostKey: kexDHReply.HostKey, + Signature: kexDHReply.Signature, + Hash: crypto.SHA1, + }, nil +} + +func (group *dhGroup) Server(c packetConn, randSource io.Reader, magics *handshakeMagics, priv Signer) (result *kexResult, err error) { + hashFunc := crypto.SHA1 + packet, err := c.readPacket() + if err != nil { + return + } + var kexDHInit kexDHInitMsg + if err = Unmarshal(packet, &kexDHInit); err != nil { + return + } + + var y *big.Int + for { + if y, err = rand.Int(randSource, group.pMinus1); err != nil { + return + } + if y.Sign() > 0 { + break + } + } + + Y := new(big.Int).Exp(group.g, y, group.p) + kInt, err := group.diffieHellman(kexDHInit.X, y) + if err != nil { + return nil, err + } + + hostKeyBytes := priv.PublicKey().Marshal() + + h := hashFunc.New() + magics.write(h) + writeString(h, hostKeyBytes) + writeInt(h, kexDHInit.X) + writeInt(h, Y) + + K := make([]byte, intLength(kInt)) + marshalInt(K, kInt) + h.Write(K) + + H := h.Sum(nil) + + // H is already a hash, but the hostkey signing will apply its + // own key-specific hash algorithm. + sig, err := signAndMarshal(priv, randSource, H) + if err != nil { + return nil, err + } + + kexDHReply := kexDHReplyMsg{ + HostKey: hostKeyBytes, + Y: Y, + Signature: sig, + } + packet = Marshal(&kexDHReply) + + err = c.writePacket(packet) + return &kexResult{ + H: H, + K: K, + HostKey: hostKeyBytes, + Signature: sig, + Hash: crypto.SHA1, + }, nil +} + +// ecdh performs Elliptic Curve Diffie-Hellman key exchange as +// described in RFC 5656, section 4. +type ecdh struct { + curve elliptic.Curve +} + +func (kex *ecdh) Client(c packetConn, rand io.Reader, magics *handshakeMagics) (*kexResult, error) { + ephKey, err := ecdsa.GenerateKey(kex.curve, rand) + if err != nil { + return nil, err + } + + kexInit := kexECDHInitMsg{ + ClientPubKey: elliptic.Marshal(kex.curve, ephKey.PublicKey.X, ephKey.PublicKey.Y), + } + + serialized := Marshal(&kexInit) + if err := c.writePacket(serialized); err != nil { + return nil, err + } + + packet, err := c.readPacket() + if err != nil { + return nil, err + } + + var reply kexECDHReplyMsg + if err = Unmarshal(packet, &reply); err != nil { + return nil, err + } + + x, y, err := unmarshalECKey(kex.curve, reply.EphemeralPubKey) + if err != nil { + return nil, err + } + + // generate shared secret + secret, _ := kex.curve.ScalarMult(x, y, ephKey.D.Bytes()) + + h := ecHash(kex.curve).New() + magics.write(h) + writeString(h, reply.HostKey) + writeString(h, kexInit.ClientPubKey) + writeString(h, reply.EphemeralPubKey) + K := make([]byte, intLength(secret)) + marshalInt(K, secret) + h.Write(K) + + return &kexResult{ + H: h.Sum(nil), + K: K, + HostKey: reply.HostKey, + Signature: reply.Signature, + Hash: ecHash(kex.curve), + }, nil +} + +// unmarshalECKey parses and checks an EC key. +func unmarshalECKey(curve elliptic.Curve, pubkey []byte) (x, y *big.Int, err error) { + x, y = elliptic.Unmarshal(curve, pubkey) + if x == nil { + return nil, nil, errors.New("ssh: elliptic.Unmarshal failure") + } + if !validateECPublicKey(curve, x, y) { + return nil, nil, errors.New("ssh: public key not on curve") + } + return x, y, nil +} + +// validateECPublicKey checks that the point is a valid public key for +// the given curve. See [SEC1], 3.2.2 +func validateECPublicKey(curve elliptic.Curve, x, y *big.Int) bool { + if x.Sign() == 0 && y.Sign() == 0 { + return false + } + + if x.Cmp(curve.Params().P) >= 0 { + return false + } + + if y.Cmp(curve.Params().P) >= 0 { + return false + } + + if !curve.IsOnCurve(x, y) { + return false + } + + // We don't check if N * PubKey == 0, since + // + // - the NIST curves have cofactor = 1, so this is implicit. + // (We don't foresee an implementation that supports non NIST + // curves) + // + // - for ephemeral keys, we don't need to worry about small + // subgroup attacks. + return true +} + +func (kex *ecdh) Server(c packetConn, rand io.Reader, magics *handshakeMagics, priv Signer) (result *kexResult, err error) { + packet, err := c.readPacket() + if err != nil { + return nil, err + } + + var kexECDHInit kexECDHInitMsg + if err = Unmarshal(packet, &kexECDHInit); err != nil { + return nil, err + } + + clientX, clientY, err := unmarshalECKey(kex.curve, kexECDHInit.ClientPubKey) + if err != nil { + return nil, err + } + + // We could cache this key across multiple users/multiple + // connection attempts, but the benefit is small. OpenSSH + // generates a new key for each incoming connection. + ephKey, err := ecdsa.GenerateKey(kex.curve, rand) + if err != nil { + return nil, err + } + + hostKeyBytes := priv.PublicKey().Marshal() + + serializedEphKey := elliptic.Marshal(kex.curve, ephKey.PublicKey.X, ephKey.PublicKey.Y) + + // generate shared secret + secret, _ := kex.curve.ScalarMult(clientX, clientY, ephKey.D.Bytes()) + + h := ecHash(kex.curve).New() + magics.write(h) + writeString(h, hostKeyBytes) + writeString(h, kexECDHInit.ClientPubKey) + writeString(h, serializedEphKey) + + K := make([]byte, intLength(secret)) + marshalInt(K, secret) + h.Write(K) + + H := h.Sum(nil) + + // H is already a hash, but the hostkey signing will apply its + // own key-specific hash algorithm. + sig, err := signAndMarshal(priv, rand, H) + if err != nil { + return nil, err + } + + reply := kexECDHReplyMsg{ + EphemeralPubKey: serializedEphKey, + HostKey: hostKeyBytes, + Signature: sig, + } + + serialized := Marshal(&reply) + if err := c.writePacket(serialized); err != nil { + return nil, err + } + + return &kexResult{ + H: H, + K: K, + HostKey: reply.HostKey, + Signature: sig, + Hash: ecHash(kex.curve), + }, nil +} + +var kexAlgoMap = map[string]kexAlgorithm{} + +func init() { + // This is the group called diffie-hellman-group1-sha1 in RFC + // 4253 and Oakley Group 2 in RFC 2409. + p, _ := new(big.Int).SetString("FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088A67CC74020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7EDEE386BFB5A899FA5AE9F24117C4B1FE649286651ECE65381FFFFFFFFFFFFFFFF", 16) + kexAlgoMap[kexAlgoDH1SHA1] = &dhGroup{ + g: new(big.Int).SetInt64(2), + p: p, + pMinus1: new(big.Int).Sub(p, bigOne), + } + + // This is the group called diffie-hellman-group14-sha1 in RFC + // 4253 and Oakley Group 14 in RFC 3526. + p, _ = new(big.Int).SetString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kexAlgoMap[kexAlgoDH14SHA1] = &dhGroup{ + g: new(big.Int).SetInt64(2), + p: p, + pMinus1: new(big.Int).Sub(p, bigOne), + } + + kexAlgoMap[kexAlgoECDH521] = &ecdh{elliptic.P521()} + kexAlgoMap[kexAlgoECDH384] = &ecdh{elliptic.P384()} + kexAlgoMap[kexAlgoECDH256] = &ecdh{elliptic.P256()} + kexAlgoMap[kexAlgoCurve25519SHA256] = &curve25519sha256{} +} + +// curve25519sha256 implements the curve25519-sha256@libssh.org key +// agreement protocol, as described in +// https://git.libssh.org/projects/libssh.git/tree/doc/curve25519-sha256@libssh.org.txt +type curve25519sha256 struct{} + +type curve25519KeyPair struct { + priv [32]byte + pub [32]byte +} + +func (kp *curve25519KeyPair) generate(rand io.Reader) error { + if _, err := io.ReadFull(rand, kp.priv[:]); err != nil { + return err + } + curve25519.ScalarBaseMult(&kp.pub, &kp.priv) + return nil +} + +// curve25519Zeros is just an array of 32 zero bytes so that we have something +// convenient to compare against in order to reject curve25519 points with the +// wrong order. +var curve25519Zeros [32]byte + +func (kex *curve25519sha256) Client(c packetConn, rand io.Reader, magics *handshakeMagics) (*kexResult, error) { + var kp curve25519KeyPair + if err := kp.generate(rand); err != nil { + return nil, err + } + if err := c.writePacket(Marshal(&kexECDHInitMsg{kp.pub[:]})); err != nil { + return nil, err + } + + packet, err := c.readPacket() + if err != nil { + return nil, err + } + + var reply kexECDHReplyMsg + if err = Unmarshal(packet, &reply); err != nil { + return nil, err + } + if len(reply.EphemeralPubKey) != 32 { + return nil, errors.New("ssh: peer's curve25519 public value has wrong length") + } + + var servPub, secret [32]byte + copy(servPub[:], reply.EphemeralPubKey) + curve25519.ScalarMult(&secret, &kp.priv, &servPub) + if subtle.ConstantTimeCompare(secret[:], curve25519Zeros[:]) == 1 { + return nil, errors.New("ssh: peer's curve25519 public value has wrong order") + } + + h := crypto.SHA256.New() + magics.write(h) + writeString(h, reply.HostKey) + writeString(h, kp.pub[:]) + writeString(h, reply.EphemeralPubKey) + + kInt := new(big.Int).SetBytes(secret[:]) + K := make([]byte, intLength(kInt)) + marshalInt(K, kInt) + h.Write(K) + + return &kexResult{ + H: h.Sum(nil), + K: K, + HostKey: reply.HostKey, + Signature: reply.Signature, + Hash: crypto.SHA256, + }, nil +} + +func (kex *curve25519sha256) Server(c packetConn, rand io.Reader, magics *handshakeMagics, priv Signer) (result *kexResult, err error) { + packet, err := c.readPacket() + if err != nil { + return + } + var kexInit kexECDHInitMsg + if err = Unmarshal(packet, &kexInit); err != nil { + return + } + + if len(kexInit.ClientPubKey) != 32 { + return nil, errors.New("ssh: peer's curve25519 public value has wrong length") + } + + var kp curve25519KeyPair + if err := kp.generate(rand); err != nil { + return nil, err + } + + var clientPub, secret [32]byte + copy(clientPub[:], kexInit.ClientPubKey) + curve25519.ScalarMult(&secret, &kp.priv, &clientPub) + if subtle.ConstantTimeCompare(secret[:], curve25519Zeros[:]) == 1 { + return nil, errors.New("ssh: peer's curve25519 public value has wrong order") + } + + hostKeyBytes := priv.PublicKey().Marshal() + + h := crypto.SHA256.New() + magics.write(h) + writeString(h, hostKeyBytes) + writeString(h, kexInit.ClientPubKey) + writeString(h, kp.pub[:]) + + kInt := new(big.Int).SetBytes(secret[:]) + K := make([]byte, intLength(kInt)) + marshalInt(K, kInt) + h.Write(K) + + H := h.Sum(nil) + + sig, err := signAndMarshal(priv, rand, H) + if err != nil { + return nil, err + } + + reply := kexECDHReplyMsg{ + EphemeralPubKey: kp.pub[:], + HostKey: hostKeyBytes, + Signature: sig, + } + if err := c.writePacket(Marshal(&reply)); err != nil { + return nil, err + } + return &kexResult{ + H: H, + K: K, + HostKey: hostKeyBytes, + Signature: sig, + Hash: crypto.SHA256, + }, nil +} diff --git a/vendor/golang.org/x/crypto/ssh/kex_test.go b/vendor/golang.org/x/crypto/ssh/kex_test.go new file mode 100644 index 0000000..12ca0ac --- /dev/null +++ b/vendor/golang.org/x/crypto/ssh/kex_test.go @@ -0,0 +1,50 @@ +// Copyright 2013 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package ssh + +// Key exchange tests. + +import ( + "crypto/rand" + "reflect" + "testing" +) + +func TestKexes(t *testing.T) { + type kexResultErr struct { + result *kexResult + err error + } + + for name, kex := range kexAlgoMap { + a, b := memPipe() + + s := make(chan kexResultErr, 1) + c := make(chan kexResultErr, 1) + var magics handshakeMagics + go func() { + r, e := kex.Client(a, rand.Reader, &magics) + a.Close() + c <- kexResultErr{r, e} + }() + go func() { + r, e := kex.Server(b, rand.Reader, &magics, testSigners["ecdsa"]) + b.Close() + s <- kexResultErr{r, e} + }() + + clientRes := <-c + serverRes := <-s + if clientRes.err != nil { + t.Errorf("client: %v", clientRes.err) + } + if serverRes.err != nil { + t.Errorf("server: %v", serverRes.err) + } + if !reflect.DeepEqual(clientRes.result, serverRes.result) { + t.Errorf("kex %q: mismatch %#v, %#v", name, clientRes.result, serverRes.result) + } + } +} diff --git a/vendor/golang.org/x/crypto/ssh/keys.go b/vendor/golang.org/x/crypto/ssh/keys.go new file mode 100644 index 0000000..7a8756a --- /dev/null +++ b/vendor/golang.org/x/crypto/ssh/keys.go @@ -0,0 +1,1006 @@ +// Copyright 2012 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package ssh + +import ( + "bytes" + "crypto" + "crypto/dsa" + "crypto/ecdsa" + "crypto/elliptic" + "crypto/md5" + "crypto/rsa" + "crypto/sha256" + "crypto/x509" + "encoding/asn1" + "encoding/base64" + "encoding/hex" + "encoding/pem" + "errors" + "fmt" + "io" + "math/big" + "strings" + + "golang.org/x/crypto/ed25519" +) + +// These constants represent the algorithm names for key types supported by this +// package. +const ( + KeyAlgoRSA = "ssh-rsa" + KeyAlgoDSA = "ssh-dss" + KeyAlgoECDSA256 = "ecdsa-sha2-nistp256" + KeyAlgoECDSA384 = "ecdsa-sha2-nistp384" + KeyAlgoECDSA521 = "ecdsa-sha2-nistp521" + KeyAlgoED25519 = "ssh-ed25519" +) + +// parsePubKey parses a public key of the given algorithm. +// Use ParsePublicKey for keys with prepended algorithm. +func parsePubKey(in []byte, algo string) (pubKey PublicKey, rest []byte, err error) { + switch algo { + case KeyAlgoRSA: + return parseRSA(in) + case KeyAlgoDSA: + return parseDSA(in) + case KeyAlgoECDSA256, KeyAlgoECDSA384, KeyAlgoECDSA521: + return parseECDSA(in) + case KeyAlgoED25519: + return parseED25519(in) + case CertAlgoRSAv01, CertAlgoDSAv01, CertAlgoECDSA256v01, CertAlgoECDSA384v01, CertAlgoECDSA521v01, CertAlgoED25519v01: + cert, err := parseCert(in, certToPrivAlgo(algo)) + if err != nil { + return nil, nil, err + } + return cert, nil, nil + } + return nil, nil, fmt.Errorf("ssh: unknown key algorithm: %v", algo) +} + +// parseAuthorizedKey parses a public key in OpenSSH authorized_keys format +// (see sshd(8) manual page) once the options and key type fields have been +// removed. +func parseAuthorizedKey(in []byte) (out PublicKey, comment string, err error) { + in = bytes.TrimSpace(in) + + i := bytes.IndexAny(in, " \t") + if i == -1 { + i = len(in) + } + base64Key := in[:i] + + key := make([]byte, base64.StdEncoding.DecodedLen(len(base64Key))) + n, err := base64.StdEncoding.Decode(key, base64Key) + if err != nil { + return nil, "", err + } + key = key[:n] + out, err = ParsePublicKey(key) + if err != nil { + return nil, "", err + } + comment = string(bytes.TrimSpace(in[i:])) + return out, comment, nil +} + +// ParseKnownHosts parses an entry in the format of the known_hosts file. +// +// The known_hosts format is documented in the sshd(8) manual page. This +// function will parse a single entry from in. On successful return, marker +// will contain the optional marker value (i.e. "cert-authority" or "revoked") +// or else be empty, hosts will contain the hosts that this entry matches, +// pubKey will contain the public key and comment will contain any trailing +// comment at the end of the line. See the sshd(8) manual page for the various +// forms that a host string can take. +// +// The unparsed remainder of the input will be returned in rest. This function +// can be called repeatedly to parse multiple entries. +// +// If no entries were found in the input then err will be io.EOF. Otherwise a +// non-nil err value indicates a parse error. +func ParseKnownHosts(in []byte) (marker string, hosts []string, pubKey PublicKey, comment string, rest []byte, err error) { + for len(in) > 0 { + end := bytes.IndexByte(in, '\n') + if end != -1 { + rest = in[end+1:] + in = in[:end] + } else { + rest = nil + } + + end = bytes.IndexByte(in, '\r') + if end != -1 { + in = in[:end] + } + + in = bytes.TrimSpace(in) + if len(in) == 0 || in[0] == '#' { + in = rest + continue + } + + i := bytes.IndexAny(in, " \t") + if i == -1 { + in = rest + continue + } + + // Strip out the beginning of the known_host key. + // This is either an optional marker or a (set of) hostname(s). + keyFields := bytes.Fields(in) + if len(keyFields) < 3 || len(keyFields) > 5 { + return "", nil, nil, "", nil, errors.New("ssh: invalid entry in known_hosts data") + } + + // keyFields[0] is either "@cert-authority", "@revoked" or a comma separated + // list of hosts + marker := "" + if keyFields[0][0] == '@' { + marker = string(keyFields[0][1:]) + keyFields = keyFields[1:] + } + + hosts := string(keyFields[0]) + // keyFields[1] contains the key type (e.g. “ssh-rsa”). + // However, that information is duplicated inside the + // base64-encoded key and so is ignored here. + + key := bytes.Join(keyFields[2:], []byte(" ")) + if pubKey, comment, err = parseAuthorizedKey(key); err != nil { + return "", nil, nil, "", nil, err + } + + return marker, strings.Split(hosts, ","), pubKey, comment, rest, nil + } + + return "", nil, nil, "", nil, io.EOF +} + +// ParseAuthorizedKeys parses a public key from an authorized_keys +// file used in OpenSSH according to the sshd(8) manual page. +func ParseAuthorizedKey(in []byte) (out PublicKey, comment string, options []string, rest []byte, err error) { + for len(in) > 0 { + end := bytes.IndexByte(in, '\n') + if end != -1 { + rest = in[end+1:] + in = in[:end] + } else { + rest = nil + } + + end = bytes.IndexByte(in, '\r') + if end != -1 { + in = in[:end] + } + + in = bytes.TrimSpace(in) + if len(in) == 0 || in[0] == '#' { + in = rest + continue + } + + i := bytes.IndexAny(in, " \t") + if i == -1 { + in = rest + continue + } + + if out, comment, err = parseAuthorizedKey(in[i:]); err == nil { + return out, comment, options, rest, nil + } + + // No key type recognised. Maybe there's an options field at + // the beginning. + var b byte + inQuote := false + var candidateOptions []string + optionStart := 0 + for i, b = range in { + isEnd := !inQuote && (b == ' ' || b == '\t') + if (b == ',' && !inQuote) || isEnd { + if i-optionStart > 0 { + candidateOptions = append(candidateOptions, string(in[optionStart:i])) + } + optionStart = i + 1 + } + if isEnd { + break + } + if b == '"' && (i == 0 || (i > 0 && in[i-1] != '\\')) { + inQuote = !inQuote + } + } + for i < len(in) && (in[i] == ' ' || in[i] == '\t') { + i++ + } + if i == len(in) { + // Invalid line: unmatched quote + in = rest + continue + } + + in = in[i:] + i = bytes.IndexAny(in, " \t") + if i == -1 { + in = rest + continue + } + + if out, comment, err = parseAuthorizedKey(in[i:]); err == nil { + options = candidateOptions + return out, comment, options, rest, nil + } + + in = rest + continue + } + + return nil, "", nil, nil, errors.New("ssh: no key found") +} + +// ParsePublicKey parses an SSH public key formatted for use in +// the SSH wire protocol according to RFC 4253, section 6.6. +func ParsePublicKey(in []byte) (out PublicKey, err error) { + algo, in, ok := parseString(in) + if !ok { + return nil, errShortRead + } + var rest []byte + out, rest, err = parsePubKey(in, string(algo)) + if len(rest) > 0 { + return nil, errors.New("ssh: trailing junk in public key") + } + + return out, err +} + +// MarshalAuthorizedKey serializes key for inclusion in an OpenSSH +// authorized_keys file. The return value ends with newline. +func MarshalAuthorizedKey(key PublicKey) []byte { + b := &bytes.Buffer{} + b.WriteString(key.Type()) + b.WriteByte(' ') + e := base64.NewEncoder(base64.StdEncoding, b) + e.Write(key.Marshal()) + e.Close() + b.WriteByte('\n') + return b.Bytes() +} + +// PublicKey is an abstraction of different types of public keys. +type PublicKey interface { + // Type returns the key's type, e.g. "ssh-rsa". + Type() string + + // Marshal returns the serialized key data in SSH wire format, + // with the name prefix. + Marshal() []byte + + // Verify that sig is a signature on the given data using this + // key. This function will hash the data appropriately first. + Verify(data []byte, sig *Signature) error +} + +// CryptoPublicKey, if implemented by a PublicKey, +// returns the underlying crypto.PublicKey form of the key. +type CryptoPublicKey interface { + CryptoPublicKey() crypto.PublicKey +} + +// A Signer can create signatures that verify against a public key. +type Signer interface { + // PublicKey returns an associated PublicKey instance. + PublicKey() PublicKey + + // Sign returns raw signature for the given data. This method + // will apply the hash specified for the keytype to the data. + Sign(rand io.Reader, data []byte) (*Signature, error) +} + +type rsaPublicKey rsa.PublicKey + +func (r *rsaPublicKey) Type() string { + return "ssh-rsa" +} + +// parseRSA parses an RSA key according to RFC 4253, section 6.6. +func parseRSA(in []byte) (out PublicKey, rest []byte, err error) { + var w struct { + E *big.Int + N *big.Int + Rest []byte `ssh:"rest"` + } + if err := Unmarshal(in, &w); err != nil { + return nil, nil, err + } + + if w.E.BitLen() > 24 { + return nil, nil, errors.New("ssh: exponent too large") + } + e := w.E.Int64() + if e < 3 || e&1 == 0 { + return nil, nil, errors.New("ssh: incorrect exponent") + } + + var key rsa.PublicKey + key.E = int(e) + key.N = w.N + return (*rsaPublicKey)(&key), w.Rest, nil +} + +func (r *rsaPublicKey) Marshal() []byte { + e := new(big.Int).SetInt64(int64(r.E)) + // RSA publickey struct layout should match the struct used by + // parseRSACert in the x/crypto/ssh/agent package. + wirekey := struct { + Name string + E *big.Int + N *big.Int + }{ + KeyAlgoRSA, + e, + r.N, + } + return Marshal(&wirekey) +} + +func (r *rsaPublicKey) Verify(data []byte, sig *Signature) error { + if sig.Format != r.Type() { + return fmt.Errorf("ssh: signature type %s for key type %s", sig.Format, r.Type()) + } + h := crypto.SHA1.New() + h.Write(data) + digest := h.Sum(nil) + return rsa.VerifyPKCS1v15((*rsa.PublicKey)(r), crypto.SHA1, digest, sig.Blob) +} + +func (r *rsaPublicKey) CryptoPublicKey() crypto.PublicKey { + return (*rsa.PublicKey)(r) +} + +type dsaPublicKey dsa.PublicKey + +func (r *dsaPublicKey) Type() string { + return "ssh-dss" +} + +// parseDSA parses an DSA key according to RFC 4253, section 6.6. +func parseDSA(in []byte) (out PublicKey, rest []byte, err error) { + var w struct { + P, Q, G, Y *big.Int + Rest []byte `ssh:"rest"` + } + if err := Unmarshal(in, &w); err != nil { + return nil, nil, err + } + + key := &dsaPublicKey{ + Parameters: dsa.Parameters{ + P: w.P, + Q: w.Q, + G: w.G, + }, + Y: w.Y, + } + return key, w.Rest, nil +} + +func (k *dsaPublicKey) Marshal() []byte { + // DSA publickey struct layout should match the struct used by + // parseDSACert in the x/crypto/ssh/agent package. + w := struct { + Name string + P, Q, G, Y *big.Int + }{ + k.Type(), + k.P, + k.Q, + k.G, + k.Y, + } + + return Marshal(&w) +} + +func (k *dsaPublicKey) Verify(data []byte, sig *Signature) error { + if sig.Format != k.Type() { + return fmt.Errorf("ssh: signature type %s for key type %s", sig.Format, k.Type()) + } + h := crypto.SHA1.New() + h.Write(data) + digest := h.Sum(nil) + + // Per RFC 4253, section 6.6, + // The value for 'dss_signature_blob' is encoded as a string containing + // r, followed by s (which are 160-bit integers, without lengths or + // padding, unsigned, and in network byte order). + // For DSS purposes, sig.Blob should be exactly 40 bytes in length. + if len(sig.Blob) != 40 { + return errors.New("ssh: DSA signature parse error") + } + r := new(big.Int).SetBytes(sig.Blob[:20]) + s := new(big.Int).SetBytes(sig.Blob[20:]) + if dsa.Verify((*dsa.PublicKey)(k), digest, r, s) { + return nil + } + return errors.New("ssh: signature did not verify") +} + +func (k *dsaPublicKey) CryptoPublicKey() crypto.PublicKey { + return (*dsa.PublicKey)(k) +} + +type dsaPrivateKey struct { + *dsa.PrivateKey +} + +func (k *dsaPrivateKey) PublicKey() PublicKey { + return (*dsaPublicKey)(&k.PrivateKey.PublicKey) +} + +func (k *dsaPrivateKey) Sign(rand io.Reader, data []byte) (*Signature, error) { + h := crypto.SHA1.New() + h.Write(data) + digest := h.Sum(nil) + r, s, err := dsa.Sign(rand, k.PrivateKey, digest) + if err != nil { + return nil, err + } + + sig := make([]byte, 40) + rb := r.Bytes() + sb := s.Bytes() + + copy(sig[20-len(rb):20], rb) + copy(sig[40-len(sb):], sb) + + return &Signature{ + Format: k.PublicKey().Type(), + Blob: sig, + }, nil +} + +type ecdsaPublicKey ecdsa.PublicKey + +func (key *ecdsaPublicKey) Type() string { + return "ecdsa-sha2-" + key.nistID() +} + +func (key *ecdsaPublicKey) nistID() string { + switch key.Params().BitSize { + case 256: + return "nistp256" + case 384: + return "nistp384" + case 521: + return "nistp521" + } + panic("ssh: unsupported ecdsa key size") +} + +type ed25519PublicKey ed25519.PublicKey + +func (key ed25519PublicKey) Type() string { + return KeyAlgoED25519 +} + +func parseED25519(in []byte) (out PublicKey, rest []byte, err error) { + var w struct { + KeyBytes []byte + Rest []byte `ssh:"rest"` + } + + if err := Unmarshal(in, &w); err != nil { + return nil, nil, err + } + + key := ed25519.PublicKey(w.KeyBytes) + + return (ed25519PublicKey)(key), w.Rest, nil +} + +func (key ed25519PublicKey) Marshal() []byte { + w := struct { + Name string + KeyBytes []byte + }{ + KeyAlgoED25519, + []byte(key), + } + return Marshal(&w) +} + +func (key ed25519PublicKey) Verify(b []byte, sig *Signature) error { + if sig.Format != key.Type() { + return fmt.Errorf("ssh: signature type %s for key type %s", sig.Format, key.Type()) + } + + edKey := (ed25519.PublicKey)(key) + if ok := ed25519.Verify(edKey, b, sig.Blob); !ok { + return errors.New("ssh: signature did not verify") + } + + return nil +} + +func (k ed25519PublicKey) CryptoPublicKey() crypto.PublicKey { + return ed25519.PublicKey(k) +} + +func supportedEllipticCurve(curve elliptic.Curve) bool { + return curve == elliptic.P256() || curve == elliptic.P384() || curve == elliptic.P521() +} + +// ecHash returns the hash to match the given elliptic curve, see RFC +// 5656, section 6.2.1 +func ecHash(curve elliptic.Curve) crypto.Hash { + bitSize := curve.Params().BitSize + switch { + case bitSize <= 256: + return crypto.SHA256 + case bitSize <= 384: + return crypto.SHA384 + } + return crypto.SHA512 +} + +// parseECDSA parses an ECDSA key according to RFC 5656, section 3.1. +func parseECDSA(in []byte) (out PublicKey, rest []byte, err error) { + var w struct { + Curve string + KeyBytes []byte + Rest []byte `ssh:"rest"` + } + + if err := Unmarshal(in, &w); err != nil { + return nil, nil, err + } + + key := new(ecdsa.PublicKey) + + switch w.Curve { + case "nistp256": + key.Curve = elliptic.P256() + case "nistp384": + key.Curve = elliptic.P384() + case "nistp521": + key.Curve = elliptic.P521() + default: + return nil, nil, errors.New("ssh: unsupported curve") + } + + key.X, key.Y = elliptic.Unmarshal(key.Curve, w.KeyBytes) + if key.X == nil || key.Y == nil { + return nil, nil, errors.New("ssh: invalid curve point") + } + return (*ecdsaPublicKey)(key), w.Rest, nil +} + +func (key *ecdsaPublicKey) Marshal() []byte { + // See RFC 5656, section 3.1. + keyBytes := elliptic.Marshal(key.Curve, key.X, key.Y) + // ECDSA publickey struct layout should match the struct used by + // parseECDSACert in the x/crypto/ssh/agent package. + w := struct { + Name string + ID string + Key []byte + }{ + key.Type(), + key.nistID(), + keyBytes, + } + + return Marshal(&w) +} + +func (key *ecdsaPublicKey) Verify(data []byte, sig *Signature) error { + if sig.Format != key.Type() { + return fmt.Errorf("ssh: signature type %s for key type %s", sig.Format, key.Type()) + } + + h := ecHash(key.Curve).New() + h.Write(data) + digest := h.Sum(nil) + + // Per RFC 5656, section 3.1.2, + // The ecdsa_signature_blob value has the following specific encoding: + // mpint r + // mpint s + var ecSig struct { + R *big.Int + S *big.Int + } + + if err := Unmarshal(sig.Blob, &ecSig); err != nil { + return err + } + + if ecdsa.Verify((*ecdsa.PublicKey)(key), digest, ecSig.R, ecSig.S) { + return nil + } + return errors.New("ssh: signature did not verify") +} + +func (k *ecdsaPublicKey) CryptoPublicKey() crypto.PublicKey { + return (*ecdsa.PublicKey)(k) +} + +// NewSignerFromKey takes an *rsa.PrivateKey, *dsa.PrivateKey, +// *ecdsa.PrivateKey or any other crypto.Signer and returns a corresponding +// Signer instance. ECDSA keys must use P-256, P-384 or P-521. +func NewSignerFromKey(key interface{}) (Signer, error) { + switch key := key.(type) { + case crypto.Signer: + return NewSignerFromSigner(key) + case *dsa.PrivateKey: + return &dsaPrivateKey{key}, nil + default: + return nil, fmt.Errorf("ssh: unsupported key type %T", key) + } +} + +type wrappedSigner struct { + signer crypto.Signer + pubKey PublicKey +} + +// NewSignerFromSigner takes any crypto.Signer implementation and +// returns a corresponding Signer interface. This can be used, for +// example, with keys kept in hardware modules. +func NewSignerFromSigner(signer crypto.Signer) (Signer, error) { + pubKey, err := NewPublicKey(signer.Public()) + if err != nil { + return nil, err + } + + return &wrappedSigner{signer, pubKey}, nil +} + +func (s *wrappedSigner) PublicKey() PublicKey { + return s.pubKey +} + +func (s *wrappedSigner) Sign(rand io.Reader, data []byte) (*Signature, error) { + var hashFunc crypto.Hash + + switch key := s.pubKey.(type) { + case *rsaPublicKey, *dsaPublicKey: + hashFunc = crypto.SHA1 + case *ecdsaPublicKey: + hashFunc = ecHash(key.Curve) + case ed25519PublicKey: + default: + return nil, fmt.Errorf("ssh: unsupported key type %T", key) + } + + var digest []byte + if hashFunc != 0 { + h := hashFunc.New() + h.Write(data) + digest = h.Sum(nil) + } else { + digest = data + } + + signature, err := s.signer.Sign(rand, digest, hashFunc) + if err != nil { + return nil, err + } + + // crypto.Signer.Sign is expected to return an ASN.1-encoded signature + // for ECDSA and DSA, but that's not the encoding expected by SSH, so + // re-encode. + switch s.pubKey.(type) { + case *ecdsaPublicKey, *dsaPublicKey: + type asn1Signature struct { + R, S *big.Int + } + asn1Sig := new(asn1Signature) + _, err := asn1.Unmarshal(signature, asn1Sig) + if err != nil { + return nil, err + } + + switch s.pubKey.(type) { + case *ecdsaPublicKey: + signature = Marshal(asn1Sig) + + case *dsaPublicKey: + signature = make([]byte, 40) + r := asn1Sig.R.Bytes() + s := asn1Sig.S.Bytes() + copy(signature[20-len(r):20], r) + copy(signature[40-len(s):40], s) + } + } + + return &Signature{ + Format: s.pubKey.Type(), + Blob: signature, + }, nil +} + +// NewPublicKey takes an *rsa.PublicKey, *dsa.PublicKey, *ecdsa.PublicKey, +// or ed25519.PublicKey returns a corresponding PublicKey instance. +// ECDSA keys must use P-256, P-384 or P-521. +func NewPublicKey(key interface{}) (PublicKey, error) { + switch key := key.(type) { + case *rsa.PublicKey: + return (*rsaPublicKey)(key), nil + case *ecdsa.PublicKey: + if !supportedEllipticCurve(key.Curve) { + return nil, errors.New("ssh: only P-256, P-384 and P-521 EC keys are supported.") + } + return (*ecdsaPublicKey)(key), nil + case *dsa.PublicKey: + return (*dsaPublicKey)(key), nil + case ed25519.PublicKey: + return (ed25519PublicKey)(key), nil + default: + return nil, fmt.Errorf("ssh: unsupported key type %T", key) + } +} + +// ParsePrivateKey returns a Signer from a PEM encoded private key. It supports +// the same keys as ParseRawPrivateKey. +func ParsePrivateKey(pemBytes []byte) (Signer, error) { + key, err := ParseRawPrivateKey(pemBytes) + if err != nil { + return nil, err + } + + return NewSignerFromKey(key) +} + +// ParsePrivateKeyWithPassphrase returns a Signer from a PEM encoded private +// key and passphrase. It supports the same keys as +// ParseRawPrivateKeyWithPassphrase. +func ParsePrivateKeyWithPassphrase(pemBytes, passPhrase []byte) (Signer, error) { + key, err := ParseRawPrivateKeyWithPassphrase(pemBytes, passPhrase) + if err != nil { + return nil, err + } + + return NewSignerFromKey(key) +} + +// encryptedBlock tells whether a private key is +// encrypted by examining its Proc-Type header +// for a mention of ENCRYPTED +// according to RFC 1421 Section 4.6.1.1. +func encryptedBlock(block *pem.Block) bool { + return strings.Contains(block.Headers["Proc-Type"], "ENCRYPTED") +} + +// ParseRawPrivateKey returns a private key from a PEM encoded private key. It +// supports RSA (PKCS#1), DSA (OpenSSL), and ECDSA private keys. +func ParseRawPrivateKey(pemBytes []byte) (interface{}, error) { + block, _ := pem.Decode(pemBytes) + if block == nil { + return nil, errors.New("ssh: no key found") + } + + if encryptedBlock(block) { + return nil, errors.New("ssh: cannot decode encrypted private keys") + } + + switch block.Type { + case "RSA PRIVATE KEY": + return x509.ParsePKCS1PrivateKey(block.Bytes) + case "EC PRIVATE KEY": + return x509.ParseECPrivateKey(block.Bytes) + case "DSA PRIVATE KEY": + return ParseDSAPrivateKey(block.Bytes) + case "OPENSSH PRIVATE KEY": + return parseOpenSSHPrivateKey(block.Bytes) + default: + return nil, fmt.Errorf("ssh: unsupported key type %q", block.Type) + } +} + +// ParseRawPrivateKeyWithPassphrase returns a private key decrypted with +// passphrase from a PEM encoded private key. If wrong passphrase, return +// x509.IncorrectPasswordError. +func ParseRawPrivateKeyWithPassphrase(pemBytes, passPhrase []byte) (interface{}, error) { + block, _ := pem.Decode(pemBytes) + if block == nil { + return nil, errors.New("ssh: no key found") + } + buf := block.Bytes + + if encryptedBlock(block) { + if x509.IsEncryptedPEMBlock(block) { + var err error + buf, err = x509.DecryptPEMBlock(block, passPhrase) + if err != nil { + if err == x509.IncorrectPasswordError { + return nil, err + } + return nil, fmt.Errorf("ssh: cannot decode encrypted private keys: %v", err) + } + } + } + + switch block.Type { + case "RSA PRIVATE KEY": + return x509.ParsePKCS1PrivateKey(buf) + case "EC PRIVATE KEY": + return x509.ParseECPrivateKey(buf) + case "DSA PRIVATE KEY": + return ParseDSAPrivateKey(buf) + case "OPENSSH PRIVATE KEY": + return parseOpenSSHPrivateKey(buf) + default: + return nil, fmt.Errorf("ssh: unsupported key type %q", block.Type) + } +} + +// ParseDSAPrivateKey returns a DSA private key from its ASN.1 DER encoding, as +// specified by the OpenSSL DSA man page. +func ParseDSAPrivateKey(der []byte) (*dsa.PrivateKey, error) { + var k struct { + Version int + P *big.Int + Q *big.Int + G *big.Int + Pub *big.Int + Priv *big.Int + } + rest, err := asn1.Unmarshal(der, &k) + if err != nil { + return nil, errors.New("ssh: failed to parse DSA key: " + err.Error()) + } + if len(rest) > 0 { + return nil, errors.New("ssh: garbage after DSA key") + } + + return &dsa.PrivateKey{ + PublicKey: dsa.PublicKey{ + Parameters: dsa.Parameters{ + P: k.P, + Q: k.Q, + G: k.G, + }, + Y: k.Pub, + }, + X: k.Priv, + }, nil +} + +// Implemented based on the documentation at +// https://github.com/openssh/openssh-portable/blob/master/PROTOCOL.key +func parseOpenSSHPrivateKey(key []byte) (crypto.PrivateKey, error) { + magic := append([]byte("openssh-key-v1"), 0) + if !bytes.Equal(magic, key[0:len(magic)]) { + return nil, errors.New("ssh: invalid openssh private key format") + } + remaining := key[len(magic):] + + var w struct { + CipherName string + KdfName string + KdfOpts string + NumKeys uint32 + PubKey []byte + PrivKeyBlock []byte + } + + if err := Unmarshal(remaining, &w); err != nil { + return nil, err + } + + if w.KdfName != "none" || w.CipherName != "none" { + return nil, errors.New("ssh: cannot decode encrypted private keys") + } + + pk1 := struct { + Check1 uint32 + Check2 uint32 + Keytype string + Rest []byte `ssh:"rest"` + }{} + + if err := Unmarshal(w.PrivKeyBlock, &pk1); err != nil { + return nil, err + } + + if pk1.Check1 != pk1.Check2 { + return nil, errors.New("ssh: checkint mismatch") + } + + // we only handle ed25519 and rsa keys currently + switch pk1.Keytype { + case KeyAlgoRSA: + // https://github.com/openssh/openssh-portable/blob/master/sshkey.c#L2760-L2773 + key := struct { + N *big.Int + E *big.Int + D *big.Int + Iqmp *big.Int + P *big.Int + Q *big.Int + Comment string + Pad []byte `ssh:"rest"` + }{} + + if err := Unmarshal(pk1.Rest, &key); err != nil { + return nil, err + } + + for i, b := range key.Pad { + if int(b) != i+1 { + return nil, errors.New("ssh: padding not as expected") + } + } + + pk := &rsa.PrivateKey{ + PublicKey: rsa.PublicKey{ + N: key.N, + E: int(key.E.Int64()), + }, + D: key.D, + Primes: []*big.Int{key.P, key.Q}, + } + + if err := pk.Validate(); err != nil { + return nil, err + } + + pk.Precompute() + + return pk, nil + case KeyAlgoED25519: + key := struct { + Pub []byte + Priv []byte + Comment string + Pad []byte `ssh:"rest"` + }{} + + if err := Unmarshal(pk1.Rest, &key); err != nil { + return nil, err + } + + if len(key.Priv) != ed25519.PrivateKeySize { + return nil, errors.New("ssh: private key unexpected length") + } + + for i, b := range key.Pad { + if int(b) != i+1 { + return nil, errors.New("ssh: padding not as expected") + } + } + + pk := ed25519.PrivateKey(make([]byte, ed25519.PrivateKeySize)) + copy(pk, key.Priv) + return &pk, nil + default: + return nil, errors.New("ssh: unhandled key type") + } +} + +// FingerprintLegacyMD5 returns the user presentation of the key's +// fingerprint as described by RFC 4716 section 4. +func FingerprintLegacyMD5(pubKey PublicKey) string { + md5sum := md5.Sum(pubKey.Marshal()) + hexarray := make([]string, len(md5sum)) + for i, c := range md5sum { + hexarray[i] = hex.EncodeToString([]byte{c}) + } + return strings.Join(hexarray, ":") +} + +// FingerprintSHA256 returns the user presentation of the key's +// fingerprint as unpadded base64 encoded sha256 hash. +// This format was introduced from OpenSSH 6.8. +// https://www.openssh.com/txt/release-6.8 +// https://tools.ietf.org/html/rfc4648#section-3.2 (unpadded base64 encoding) +func FingerprintSHA256(pubKey PublicKey) string { + sha256sum := sha256.Sum256(pubKey.Marshal()) + hash := base64.RawStdEncoding.EncodeToString(sha256sum[:]) + return "SHA256:" + hash +} diff --git a/vendor/golang.org/x/crypto/ssh/keys_test.go b/vendor/golang.org/x/crypto/ssh/keys_test.go new file mode 100644 index 0000000..20ab954 --- /dev/null +++ b/vendor/golang.org/x/crypto/ssh/keys_test.go @@ -0,0 +1,500 @@ +// Copyright 2014 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package ssh + +import ( + "bytes" + "crypto/dsa" + "crypto/ecdsa" + "crypto/elliptic" + "crypto/rand" + "crypto/rsa" + "crypto/x509" + "encoding/base64" + "fmt" + "reflect" + "strings" + "testing" + + "golang.org/x/crypto/ed25519" + "golang.org/x/crypto/ssh/testdata" +) + +func rawKey(pub PublicKey) interface{} { + switch k := pub.(type) { + case *rsaPublicKey: + return (*rsa.PublicKey)(k) + case *dsaPublicKey: + return (*dsa.PublicKey)(k) + case *ecdsaPublicKey: + return (*ecdsa.PublicKey)(k) + case ed25519PublicKey: + return (ed25519.PublicKey)(k) + case *Certificate: + return k + } + panic("unknown key type") +} + +func TestKeyMarshalParse(t *testing.T) { + for _, priv := range testSigners { + pub := priv.PublicKey() + roundtrip, err := ParsePublicKey(pub.Marshal()) + if err != nil { + t.Errorf("ParsePublicKey(%T): %v", pub, err) + } + + k1 := rawKey(pub) + k2 := rawKey(roundtrip) + + if !reflect.DeepEqual(k1, k2) { + t.Errorf("got %#v in roundtrip, want %#v", k2, k1) + } + } +} + +func TestUnsupportedCurves(t *testing.T) { + raw, err := ecdsa.GenerateKey(elliptic.P224(), rand.Reader) + if err != nil { + t.Fatalf("GenerateKey: %v", err) + } + + if _, err = NewSignerFromKey(raw); err == nil || !strings.Contains(err.Error(), "only P-256") { + t.Fatalf("NewPrivateKey should not succeed with P-224, got: %v", err) + } + + if _, err = NewPublicKey(&raw.PublicKey); err == nil || !strings.Contains(err.Error(), "only P-256") { + t.Fatalf("NewPublicKey should not succeed with P-224, got: %v", err) + } +} + +func TestNewPublicKey(t *testing.T) { + for _, k := range testSigners { + raw := rawKey(k.PublicKey()) + // Skip certificates, as NewPublicKey does not support them. + if _, ok := raw.(*Certificate); ok { + continue + } + pub, err := NewPublicKey(raw) + if err != nil { + t.Errorf("NewPublicKey(%#v): %v", raw, err) + } + if !reflect.DeepEqual(k.PublicKey(), pub) { + t.Errorf("NewPublicKey(%#v) = %#v, want %#v", raw, pub, k.PublicKey()) + } + } +} + +func TestKeySignVerify(t *testing.T) { + for _, priv := range testSigners { + pub := priv.PublicKey() + + data := []byte("sign me") + sig, err := priv.Sign(rand.Reader, data) + if err != nil { + t.Fatalf("Sign(%T): %v", priv, err) + } + + if err := pub.Verify(data, sig); err != nil { + t.Errorf("publicKey.Verify(%T): %v", priv, err) + } + sig.Blob[5]++ + if err := pub.Verify(data, sig); err == nil { + t.Errorf("publicKey.Verify on broken sig did not fail") + } + } +} + +func TestParseRSAPrivateKey(t *testing.T) { + key := testPrivateKeys["rsa"] + + rsa, ok := key.(*rsa.PrivateKey) + if !ok { + t.Fatalf("got %T, want *rsa.PrivateKey", rsa) + } + + if err := rsa.Validate(); err != nil { + t.Errorf("Validate: %v", err) + } +} + +func TestParseECPrivateKey(t *testing.T) { + key := testPrivateKeys["ecdsa"] + + ecKey, ok := key.(*ecdsa.PrivateKey) + if !ok { + t.Fatalf("got %T, want *ecdsa.PrivateKey", ecKey) + } + + if !validateECPublicKey(ecKey.Curve, ecKey.X, ecKey.Y) { + t.Fatalf("public key does not validate.") + } +} + +// See Issue https://github.com/golang/go/issues/6650. +func TestParseEncryptedPrivateKeysFails(t *testing.T) { + const wantSubstring = "encrypted" + for i, tt := range testdata.PEMEncryptedKeys { + _, err := ParsePrivateKey(tt.PEMBytes) + if err == nil { + t.Errorf("#%d key %s: ParsePrivateKey successfully parsed, expected an error", i, tt.Name) + continue + } + + if !strings.Contains(err.Error(), wantSubstring) { + t.Errorf("#%d key %s: got error %q, want substring %q", i, tt.Name, err, wantSubstring) + } + } +} + +// Parse encrypted private keys with passphrase +func TestParseEncryptedPrivateKeysWithPassphrase(t *testing.T) { + data := []byte("sign me") + for _, tt := range testdata.PEMEncryptedKeys { + s, err := ParsePrivateKeyWithPassphrase(tt.PEMBytes, []byte(tt.EncryptionKey)) + if err != nil { + t.Fatalf("ParsePrivateKeyWithPassphrase returned error: %s", err) + continue + } + sig, err := s.Sign(rand.Reader, data) + if err != nil { + t.Fatalf("dsa.Sign: %v", err) + } + if err := s.PublicKey().Verify(data, sig); err != nil { + t.Errorf("Verify failed: %v", err) + } + } + + tt := testdata.PEMEncryptedKeys[0] + _, err := ParsePrivateKeyWithPassphrase(tt.PEMBytes, []byte("incorrect")) + if err != x509.IncorrectPasswordError { + t.Fatalf("got %v want IncorrectPasswordError", err) + } +} + +func TestParseDSA(t *testing.T) { + // We actually exercise the ParsePrivateKey codepath here, as opposed to + // using the ParseRawPrivateKey+NewSignerFromKey path that testdata_test.go + // uses. + s, err := ParsePrivateKey(testdata.PEMBytes["dsa"]) + if err != nil { + t.Fatalf("ParsePrivateKey returned error: %s", err) + } + + data := []byte("sign me") + sig, err := s.Sign(rand.Reader, data) + if err != nil { + t.Fatalf("dsa.Sign: %v", err) + } + + if err := s.PublicKey().Verify(data, sig); err != nil { + t.Errorf("Verify failed: %v", err) + } +} + +// Tests for authorized_keys parsing. + +// getTestKey returns a public key, and its base64 encoding. +func getTestKey() (PublicKey, string) { + k := testPublicKeys["rsa"] + + b := &bytes.Buffer{} + e := base64.NewEncoder(base64.StdEncoding, b) + e.Write(k.Marshal()) + e.Close() + + return k, b.String() +} + +func TestMarshalParsePublicKey(t *testing.T) { + pub, pubSerialized := getTestKey() + line := fmt.Sprintf("%s %s user@host", pub.Type(), pubSerialized) + + authKeys := MarshalAuthorizedKey(pub) + actualFields := strings.Fields(string(authKeys)) + if len(actualFields) == 0 { + t.Fatalf("failed authKeys: %v", authKeys) + } + + // drop the comment + expectedFields := strings.Fields(line)[0:2] + + if !reflect.DeepEqual(actualFields, expectedFields) { + t.Errorf("got %v, expected %v", actualFields, expectedFields) + } + + actPub, _, _, _, err := ParseAuthorizedKey([]byte(line)) + if err != nil { + t.Fatalf("cannot parse %v: %v", line, err) + } + if !reflect.DeepEqual(actPub, pub) { + t.Errorf("got %v, expected %v", actPub, pub) + } +} + +type authResult struct { + pubKey PublicKey + options []string + comments string + rest string + ok bool +} + +func testAuthorizedKeys(t *testing.T, authKeys []byte, expected []authResult) { + rest := authKeys + var values []authResult + for len(rest) > 0 { + var r authResult + var err error + r.pubKey, r.comments, r.options, rest, err = ParseAuthorizedKey(rest) + r.ok = (err == nil) + t.Log(err) + r.rest = string(rest) + values = append(values, r) + } + + if !reflect.DeepEqual(values, expected) { + t.Errorf("got %#v, expected %#v", values, expected) + } +} + +func TestAuthorizedKeyBasic(t *testing.T) { + pub, pubSerialized := getTestKey() + line := "ssh-rsa " + pubSerialized + " user@host" + testAuthorizedKeys(t, []byte(line), + []authResult{ + {pub, nil, "user@host", "", true}, + }) +} + +func TestAuth(t *testing.T) { + pub, pubSerialized := getTestKey() + authWithOptions := []string{ + `# comments to ignore before any keys...`, + ``, + `env="HOME=/home/root",no-port-forwarding ssh-rsa ` + pubSerialized + ` user@host`, + `# comments to ignore, along with a blank line`, + ``, + `env="HOME=/home/root2" ssh-rsa ` + pubSerialized + ` user2@host2`, + ``, + `# more comments, plus a invalid entry`, + `ssh-rsa data-that-will-not-parse user@host3`, + } + for _, eol := range []string{"\n", "\r\n"} { + authOptions := strings.Join(authWithOptions, eol) + rest2 := strings.Join(authWithOptions[3:], eol) + rest3 := strings.Join(authWithOptions[6:], eol) + testAuthorizedKeys(t, []byte(authOptions), []authResult{ + {pub, []string{`env="HOME=/home/root"`, "no-port-forwarding"}, "user@host", rest2, true}, + {pub, []string{`env="HOME=/home/root2"`}, "user2@host2", rest3, true}, + {nil, nil, "", "", false}, + }) + } +} + +func TestAuthWithQuotedSpaceInEnv(t *testing.T) { + pub, pubSerialized := getTestKey() + authWithQuotedSpaceInEnv := []byte(`env="HOME=/home/root dir",no-port-forwarding ssh-rsa ` + pubSerialized + ` user@host`) + testAuthorizedKeys(t, []byte(authWithQuotedSpaceInEnv), []authResult{ + {pub, []string{`env="HOME=/home/root dir"`, "no-port-forwarding"}, "user@host", "", true}, + }) +} + +func TestAuthWithQuotedCommaInEnv(t *testing.T) { + pub, pubSerialized := getTestKey() + authWithQuotedCommaInEnv := []byte(`env="HOME=/home/root,dir",no-port-forwarding ssh-rsa ` + pubSerialized + ` user@host`) + testAuthorizedKeys(t, []byte(authWithQuotedCommaInEnv), []authResult{ + {pub, []string{`env="HOME=/home/root,dir"`, "no-port-forwarding"}, "user@host", "", true}, + }) +} + +func TestAuthWithQuotedQuoteInEnv(t *testing.T) { + pub, pubSerialized := getTestKey() + authWithQuotedQuoteInEnv := []byte(`env="HOME=/home/\"root dir",no-port-forwarding` + "\t" + `ssh-rsa` + "\t" + pubSerialized + ` user@host`) + authWithDoubleQuotedQuote := []byte(`no-port-forwarding,env="HOME=/home/ \"root dir\"" ssh-rsa ` + pubSerialized + "\t" + `user@host`) + testAuthorizedKeys(t, []byte(authWithQuotedQuoteInEnv), []authResult{ + {pub, []string{`env="HOME=/home/\"root dir"`, "no-port-forwarding"}, "user@host", "", true}, + }) + + testAuthorizedKeys(t, []byte(authWithDoubleQuotedQuote), []authResult{ + {pub, []string{"no-port-forwarding", `env="HOME=/home/ \"root dir\""`}, "user@host", "", true}, + }) +} + +func TestAuthWithInvalidSpace(t *testing.T) { + _, pubSerialized := getTestKey() + authWithInvalidSpace := []byte(`env="HOME=/home/root dir", no-port-forwarding ssh-rsa ` + pubSerialized + ` user@host +#more to follow but still no valid keys`) + testAuthorizedKeys(t, []byte(authWithInvalidSpace), []authResult{ + {nil, nil, "", "", false}, + }) +} + +func TestAuthWithMissingQuote(t *testing.T) { + pub, pubSerialized := getTestKey() + authWithMissingQuote := []byte(`env="HOME=/home/root,no-port-forwarding ssh-rsa ` + pubSerialized + ` user@host +env="HOME=/home/root",shared-control ssh-rsa ` + pubSerialized + ` user@host`) + + testAuthorizedKeys(t, []byte(authWithMissingQuote), []authResult{ + {pub, []string{`env="HOME=/home/root"`, `shared-control`}, "user@host", "", true}, + }) +} + +func TestInvalidEntry(t *testing.T) { + authInvalid := []byte(`ssh-rsa`) + _, _, _, _, err := ParseAuthorizedKey(authInvalid) + if err == nil { + t.Errorf("got valid entry for %q", authInvalid) + } +} + +var knownHostsParseTests = []struct { + input string + err string + + marker string + comment string + hosts []string + rest string +}{ + { + "", + "EOF", + + "", "", nil, "", + }, + { + "# Just a comment", + "EOF", + + "", "", nil, "", + }, + { + " \t ", + "EOF", + + "", "", nil, "", + }, + { + "localhost ssh-rsa {RSAPUB}", + "", + + "", "", []string{"localhost"}, "", + }, + { + "localhost\tssh-rsa {RSAPUB}", + "", + + "", "", []string{"localhost"}, "", + }, + { + "localhost\tssh-rsa {RSAPUB}\tcomment comment", + "", + + "", "comment comment", []string{"localhost"}, "", + }, + { + "localhost\tssh-rsa {RSAPUB}\tcomment comment\n", + "", + + "", "comment comment", []string{"localhost"}, "", + }, + { + "localhost\tssh-rsa {RSAPUB}\tcomment comment\r\n", + "", + + "", "comment comment", []string{"localhost"}, "", + }, + { + "localhost\tssh-rsa {RSAPUB}\tcomment comment\r\nnext line", + "", + + "", "comment comment", []string{"localhost"}, "next line", + }, + { + "localhost,[host2:123]\tssh-rsa {RSAPUB}\tcomment comment", + "", + + "", "comment comment", []string{"localhost", "[host2:123]"}, "", + }, + { + "@marker \tlocalhost,[host2:123]\tssh-rsa {RSAPUB}", + "", + + "marker", "", []string{"localhost", "[host2:123]"}, "", + }, + { + "@marker \tlocalhost,[host2:123]\tssh-rsa aabbccdd", + "short read", + + "", "", nil, "", + }, +} + +func TestKnownHostsParsing(t *testing.T) { + rsaPub, rsaPubSerialized := getTestKey() + + for i, test := range knownHostsParseTests { + var expectedKey PublicKey + const rsaKeyToken = "{RSAPUB}" + + input := test.input + if strings.Contains(input, rsaKeyToken) { + expectedKey = rsaPub + input = strings.Replace(test.input, rsaKeyToken, rsaPubSerialized, -1) + } + + marker, hosts, pubKey, comment, rest, err := ParseKnownHosts([]byte(input)) + if err != nil { + if len(test.err) == 0 { + t.Errorf("#%d: unexpectedly failed with %q", i, err) + } else if !strings.Contains(err.Error(), test.err) { + t.Errorf("#%d: expected error containing %q, but got %q", i, test.err, err) + } + continue + } else if len(test.err) != 0 { + t.Errorf("#%d: succeeded but expected error including %q", i, test.err) + continue + } + + if !reflect.DeepEqual(expectedKey, pubKey) { + t.Errorf("#%d: expected key %#v, but got %#v", i, expectedKey, pubKey) + } + + if marker != test.marker { + t.Errorf("#%d: expected marker %q, but got %q", i, test.marker, marker) + } + + if comment != test.comment { + t.Errorf("#%d: expected comment %q, but got %q", i, test.comment, comment) + } + + if !reflect.DeepEqual(test.hosts, hosts) { + t.Errorf("#%d: expected hosts %#v, but got %#v", i, test.hosts, hosts) + } + + if rest := string(rest); rest != test.rest { + t.Errorf("#%d: expected remaining input to be %q, but got %q", i, test.rest, rest) + } + } +} + +func TestFingerprintLegacyMD5(t *testing.T) { + pub, _ := getTestKey() + fingerprint := FingerprintLegacyMD5(pub) + want := "fb:61:6d:1a:e3:f0:95:45:3c:a0:79:be:4a:93:63:66" // ssh-keygen -lf -E md5 rsa + if fingerprint != want { + t.Errorf("got fingerprint %q want %q", fingerprint, want) + } +} + +func TestFingerprintSHA256(t *testing.T) { + pub, _ := getTestKey() + fingerprint := FingerprintSHA256(pub) + want := "SHA256:Anr3LjZK8YVpjrxu79myrW9Hrb/wpcMNpVvTq/RcBm8" // ssh-keygen -lf rsa + if fingerprint != want { + t.Errorf("got fingerprint %q want %q", fingerprint, want) + } +} diff --git a/vendor/golang.org/x/crypto/ssh/mac.go b/vendor/golang.org/x/crypto/ssh/mac.go new file mode 100644 index 0000000..c07a062 --- /dev/null +++ b/vendor/golang.org/x/crypto/ssh/mac.go @@ -0,0 +1,61 @@ +// Copyright 2012 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package ssh + +// Message authentication support + +import ( + "crypto/hmac" + "crypto/sha1" + "crypto/sha256" + "hash" +) + +type macMode struct { + keySize int + etm bool + new func(key []byte) hash.Hash +} + +// truncatingMAC wraps around a hash.Hash and truncates the output digest to +// a given size. +type truncatingMAC struct { + length int + hmac hash.Hash +} + +func (t truncatingMAC) Write(data []byte) (int, error) { + return t.hmac.Write(data) +} + +func (t truncatingMAC) Sum(in []byte) []byte { + out := t.hmac.Sum(in) + return out[:len(in)+t.length] +} + +func (t truncatingMAC) Reset() { + t.hmac.Reset() +} + +func (t truncatingMAC) Size() int { + return t.length +} + +func (t truncatingMAC) BlockSize() int { return t.hmac.BlockSize() } + +var macModes = map[string]*macMode{ + "hmac-sha2-256-etm@openssh.com": {32, true, func(key []byte) hash.Hash { + return hmac.New(sha256.New, key) + }}, + "hmac-sha2-256": {32, false, func(key []byte) hash.Hash { + return hmac.New(sha256.New, key) + }}, + "hmac-sha1": {20, false, func(key []byte) hash.Hash { + return hmac.New(sha1.New, key) + }}, + "hmac-sha1-96": {20, false, func(key []byte) hash.Hash { + return truncatingMAC{12, hmac.New(sha1.New, key)} + }}, +} diff --git a/vendor/golang.org/x/crypto/ssh/mempipe_test.go b/vendor/golang.org/x/crypto/ssh/mempipe_test.go new file mode 100644 index 0000000..8697cd6 --- /dev/null +++ b/vendor/golang.org/x/crypto/ssh/mempipe_test.go @@ -0,0 +1,110 @@ +// Copyright 2013 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package ssh + +import ( + "io" + "sync" + "testing" +) + +// An in-memory packetConn. It is safe to call Close and writePacket +// from different goroutines. +type memTransport struct { + eof bool + pending [][]byte + write *memTransport + sync.Mutex + *sync.Cond +} + +func (t *memTransport) readPacket() ([]byte, error) { + t.Lock() + defer t.Unlock() + for { + if len(t.pending) > 0 { + r := t.pending[0] + t.pending = t.pending[1:] + return r, nil + } + if t.eof { + return nil, io.EOF + } + t.Cond.Wait() + } +} + +func (t *memTransport) closeSelf() error { + t.Lock() + defer t.Unlock() + if t.eof { + return io.EOF + } + t.eof = true + t.Cond.Broadcast() + return nil +} + +func (t *memTransport) Close() error { + err := t.write.closeSelf() + t.closeSelf() + return err +} + +func (t *memTransport) writePacket(p []byte) error { + t.write.Lock() + defer t.write.Unlock() + if t.write.eof { + return io.EOF + } + c := make([]byte, len(p)) + copy(c, p) + t.write.pending = append(t.write.pending, c) + t.write.Cond.Signal() + return nil +} + +func memPipe() (a, b packetConn) { + t1 := memTransport{} + t2 := memTransport{} + t1.write = &t2 + t2.write = &t1 + t1.Cond = sync.NewCond(&t1.Mutex) + t2.Cond = sync.NewCond(&t2.Mutex) + return &t1, &t2 +} + +func TestMemPipe(t *testing.T) { + a, b := memPipe() + if err := a.writePacket([]byte{42}); err != nil { + t.Fatalf("writePacket: %v", err) + } + if err := a.Close(); err != nil { + t.Fatal("Close: ", err) + } + p, err := b.readPacket() + if err != nil { + t.Fatal("readPacket: ", err) + } + if len(p) != 1 || p[0] != 42 { + t.Fatalf("got %v, want {42}", p) + } + p, err = b.readPacket() + if err != io.EOF { + t.Fatalf("got %v, %v, want EOF", p, err) + } +} + +func TestDoubleClose(t *testing.T) { + a, _ := memPipe() + err := a.Close() + if err != nil { + t.Errorf("Close: %v", err) + } + err = a.Close() + if err != io.EOF { + t.Errorf("expect EOF on double close.") + } +} diff --git a/vendor/golang.org/x/crypto/ssh/messages.go b/vendor/golang.org/x/crypto/ssh/messages.go new file mode 100644 index 0000000..e6ecd3a --- /dev/null +++ b/vendor/golang.org/x/crypto/ssh/messages.go @@ -0,0 +1,758 @@ +// Copyright 2011 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package ssh + +import ( + "bytes" + "encoding/binary" + "errors" + "fmt" + "io" + "math/big" + "reflect" + "strconv" + "strings" +) + +// These are SSH message type numbers. They are scattered around several +// documents but many were taken from [SSH-PARAMETERS]. +const ( + msgIgnore = 2 + msgUnimplemented = 3 + msgDebug = 4 + msgNewKeys = 21 + + // Standard authentication messages + msgUserAuthSuccess = 52 + msgUserAuthBanner = 53 +) + +// SSH messages: +// +// These structures mirror the wire format of the corresponding SSH messages. +// They are marshaled using reflection with the marshal and unmarshal functions +// in this file. The only wrinkle is that a final member of type []byte with a +// ssh tag of "rest" receives the remainder of a packet when unmarshaling. + +// See RFC 4253, section 11.1. +const msgDisconnect = 1 + +// disconnectMsg is the message that signals a disconnect. It is also +// the error type returned from mux.Wait() +type disconnectMsg struct { + Reason uint32 `sshtype:"1"` + Message string + Language string +} + +func (d *disconnectMsg) Error() string { + return fmt.Sprintf("ssh: disconnect, reason %d: %s", d.Reason, d.Message) +} + +// See RFC 4253, section 7.1. +const msgKexInit = 20 + +type kexInitMsg struct { + Cookie [16]byte `sshtype:"20"` + KexAlgos []string + ServerHostKeyAlgos []string + CiphersClientServer []string + CiphersServerClient []string + MACsClientServer []string + MACsServerClient []string + CompressionClientServer []string + CompressionServerClient []string + LanguagesClientServer []string + LanguagesServerClient []string + FirstKexFollows bool + Reserved uint32 +} + +// See RFC 4253, section 8. + +// Diffie-Helman +const msgKexDHInit = 30 + +type kexDHInitMsg struct { + X *big.Int `sshtype:"30"` +} + +const msgKexECDHInit = 30 + +type kexECDHInitMsg struct { + ClientPubKey []byte `sshtype:"30"` +} + +const msgKexECDHReply = 31 + +type kexECDHReplyMsg struct { + HostKey []byte `sshtype:"31"` + EphemeralPubKey []byte + Signature []byte +} + +const msgKexDHReply = 31 + +type kexDHReplyMsg struct { + HostKey []byte `sshtype:"31"` + Y *big.Int + Signature []byte +} + +// See RFC 4253, section 10. +const msgServiceRequest = 5 + +type serviceRequestMsg struct { + Service string `sshtype:"5"` +} + +// See RFC 4253, section 10. +const msgServiceAccept = 6 + +type serviceAcceptMsg struct { + Service string `sshtype:"6"` +} + +// See RFC 4252, section 5. +const msgUserAuthRequest = 50 + +type userAuthRequestMsg struct { + User string `sshtype:"50"` + Service string + Method string + Payload []byte `ssh:"rest"` +} + +// Used for debug printouts of packets. +type userAuthSuccessMsg struct { +} + +// See RFC 4252, section 5.1 +const msgUserAuthFailure = 51 + +type userAuthFailureMsg struct { + Methods []string `sshtype:"51"` + PartialSuccess bool +} + +// See RFC 4256, section 3.2 +const msgUserAuthInfoRequest = 60 +const msgUserAuthInfoResponse = 61 + +type userAuthInfoRequestMsg struct { + User string `sshtype:"60"` + Instruction string + DeprecatedLanguage string + NumPrompts uint32 + Prompts []byte `ssh:"rest"` +} + +// See RFC 4254, section 5.1. +const msgChannelOpen = 90 + +type channelOpenMsg struct { + ChanType string `sshtype:"90"` + PeersId uint32 + PeersWindow uint32 + MaxPacketSize uint32 + TypeSpecificData []byte `ssh:"rest"` +} + +const msgChannelExtendedData = 95 +const msgChannelData = 94 + +// Used for debug print outs of packets. +type channelDataMsg struct { + PeersId uint32 `sshtype:"94"` + Length uint32 + Rest []byte `ssh:"rest"` +} + +// See RFC 4254, section 5.1. +const msgChannelOpenConfirm = 91 + +type channelOpenConfirmMsg struct { + PeersId uint32 `sshtype:"91"` + MyId uint32 + MyWindow uint32 + MaxPacketSize uint32 + TypeSpecificData []byte `ssh:"rest"` +} + +// See RFC 4254, section 5.1. +const msgChannelOpenFailure = 92 + +type channelOpenFailureMsg struct { + PeersId uint32 `sshtype:"92"` + Reason RejectionReason + Message string + Language string +} + +const msgChannelRequest = 98 + +type channelRequestMsg struct { + PeersId uint32 `sshtype:"98"` + Request string + WantReply bool + RequestSpecificData []byte `ssh:"rest"` +} + +// See RFC 4254, section 5.4. +const msgChannelSuccess = 99 + +type channelRequestSuccessMsg struct { + PeersId uint32 `sshtype:"99"` +} + +// See RFC 4254, section 5.4. +const msgChannelFailure = 100 + +type channelRequestFailureMsg struct { + PeersId uint32 `sshtype:"100"` +} + +// See RFC 4254, section 5.3 +const msgChannelClose = 97 + +type channelCloseMsg struct { + PeersId uint32 `sshtype:"97"` +} + +// See RFC 4254, section 5.3 +const msgChannelEOF = 96 + +type channelEOFMsg struct { + PeersId uint32 `sshtype:"96"` +} + +// See RFC 4254, section 4 +const msgGlobalRequest = 80 + +type globalRequestMsg struct { + Type string `sshtype:"80"` + WantReply bool + Data []byte `ssh:"rest"` +} + +// See RFC 4254, section 4 +const msgRequestSuccess = 81 + +type globalRequestSuccessMsg struct { + Data []byte `ssh:"rest" sshtype:"81"` +} + +// See RFC 4254, section 4 +const msgRequestFailure = 82 + +type globalRequestFailureMsg struct { + Data []byte `ssh:"rest" sshtype:"82"` +} + +// See RFC 4254, section 5.2 +const msgChannelWindowAdjust = 93 + +type windowAdjustMsg struct { + PeersId uint32 `sshtype:"93"` + AdditionalBytes uint32 +} + +// See RFC 4252, section 7 +const msgUserAuthPubKeyOk = 60 + +type userAuthPubKeyOkMsg struct { + Algo string `sshtype:"60"` + PubKey []byte +} + +// typeTags returns the possible type bytes for the given reflect.Type, which +// should be a struct. The possible values are separated by a '|' character. +func typeTags(structType reflect.Type) (tags []byte) { + tagStr := structType.Field(0).Tag.Get("sshtype") + + for _, tag := range strings.Split(tagStr, "|") { + i, err := strconv.Atoi(tag) + if err == nil { + tags = append(tags, byte(i)) + } + } + + return tags +} + +func fieldError(t reflect.Type, field int, problem string) error { + if problem != "" { + problem = ": " + problem + } + return fmt.Errorf("ssh: unmarshal error for field %s of type %s%s", t.Field(field).Name, t.Name(), problem) +} + +var errShortRead = errors.New("ssh: short read") + +// Unmarshal parses data in SSH wire format into a structure. The out +// argument should be a pointer to struct. If the first member of the +// struct has the "sshtype" tag set to a '|'-separated set of numbers +// in decimal, the packet must start with one of those numbers. In +// case of error, Unmarshal returns a ParseError or +// UnexpectedMessageError. +func Unmarshal(data []byte, out interface{}) error { + v := reflect.ValueOf(out).Elem() + structType := v.Type() + expectedTypes := typeTags(structType) + + var expectedType byte + if len(expectedTypes) > 0 { + expectedType = expectedTypes[0] + } + + if len(data) == 0 { + return parseError(expectedType) + } + + if len(expectedTypes) > 0 { + goodType := false + for _, e := range expectedTypes { + if e > 0 && data[0] == e { + goodType = true + break + } + } + if !goodType { + return fmt.Errorf("ssh: unexpected message type %d (expected one of %v)", data[0], expectedTypes) + } + data = data[1:] + } + + var ok bool + for i := 0; i < v.NumField(); i++ { + field := v.Field(i) + t := field.Type() + switch t.Kind() { + case reflect.Bool: + if len(data) < 1 { + return errShortRead + } + field.SetBool(data[0] != 0) + data = data[1:] + case reflect.Array: + if t.Elem().Kind() != reflect.Uint8 { + return fieldError(structType, i, "array of unsupported type") + } + if len(data) < t.Len() { + return errShortRead + } + for j, n := 0, t.Len(); j < n; j++ { + field.Index(j).Set(reflect.ValueOf(data[j])) + } + data = data[t.Len():] + case reflect.Uint64: + var u64 uint64 + if u64, data, ok = parseUint64(data); !ok { + return errShortRead + } + field.SetUint(u64) + case reflect.Uint32: + var u32 uint32 + if u32, data, ok = parseUint32(data); !ok { + return errShortRead + } + field.SetUint(uint64(u32)) + case reflect.Uint8: + if len(data) < 1 { + return errShortRead + } + field.SetUint(uint64(data[0])) + data = data[1:] + case reflect.String: + var s []byte + if s, data, ok = parseString(data); !ok { + return fieldError(structType, i, "") + } + field.SetString(string(s)) + case reflect.Slice: + switch t.Elem().Kind() { + case reflect.Uint8: + if structType.Field(i).Tag.Get("ssh") == "rest" { + field.Set(reflect.ValueOf(data)) + data = nil + } else { + var s []byte + if s, data, ok = parseString(data); !ok { + return errShortRead + } + field.Set(reflect.ValueOf(s)) + } + case reflect.String: + var nl []string + if nl, data, ok = parseNameList(data); !ok { + return errShortRead + } + field.Set(reflect.ValueOf(nl)) + default: + return fieldError(structType, i, "slice of unsupported type") + } + case reflect.Ptr: + if t == bigIntType { + var n *big.Int + if n, data, ok = parseInt(data); !ok { + return errShortRead + } + field.Set(reflect.ValueOf(n)) + } else { + return fieldError(structType, i, "pointer to unsupported type") + } + default: + return fieldError(structType, i, fmt.Sprintf("unsupported type: %v", t)) + } + } + + if len(data) != 0 { + return parseError(expectedType) + } + + return nil +} + +// Marshal serializes the message in msg to SSH wire format. The msg +// argument should be a struct or pointer to struct. If the first +// member has the "sshtype" tag set to a number in decimal, that +// number is prepended to the result. If the last of member has the +// "ssh" tag set to "rest", its contents are appended to the output. +func Marshal(msg interface{}) []byte { + out := make([]byte, 0, 64) + return marshalStruct(out, msg) +} + +func marshalStruct(out []byte, msg interface{}) []byte { + v := reflect.Indirect(reflect.ValueOf(msg)) + msgTypes := typeTags(v.Type()) + if len(msgTypes) > 0 { + out = append(out, msgTypes[0]) + } + + for i, n := 0, v.NumField(); i < n; i++ { + field := v.Field(i) + switch t := field.Type(); t.Kind() { + case reflect.Bool: + var v uint8 + if field.Bool() { + v = 1 + } + out = append(out, v) + case reflect.Array: + if t.Elem().Kind() != reflect.Uint8 { + panic(fmt.Sprintf("array of non-uint8 in field %d: %T", i, field.Interface())) + } + for j, l := 0, t.Len(); j < l; j++ { + out = append(out, uint8(field.Index(j).Uint())) + } + case reflect.Uint32: + out = appendU32(out, uint32(field.Uint())) + case reflect.Uint64: + out = appendU64(out, uint64(field.Uint())) + case reflect.Uint8: + out = append(out, uint8(field.Uint())) + case reflect.String: + s := field.String() + out = appendInt(out, len(s)) + out = append(out, s...) + case reflect.Slice: + switch t.Elem().Kind() { + case reflect.Uint8: + if v.Type().Field(i).Tag.Get("ssh") != "rest" { + out = appendInt(out, field.Len()) + } + out = append(out, field.Bytes()...) + case reflect.String: + offset := len(out) + out = appendU32(out, 0) + if n := field.Len(); n > 0 { + for j := 0; j < n; j++ { + f := field.Index(j) + if j != 0 { + out = append(out, ',') + } + out = append(out, f.String()...) + } + // overwrite length value + binary.BigEndian.PutUint32(out[offset:], uint32(len(out)-offset-4)) + } + default: + panic(fmt.Sprintf("slice of unknown type in field %d: %T", i, field.Interface())) + } + case reflect.Ptr: + if t == bigIntType { + var n *big.Int + nValue := reflect.ValueOf(&n) + nValue.Elem().Set(field) + needed := intLength(n) + oldLength := len(out) + + if cap(out)-len(out) < needed { + newOut := make([]byte, len(out), 2*(len(out)+needed)) + copy(newOut, out) + out = newOut + } + out = out[:oldLength+needed] + marshalInt(out[oldLength:], n) + } else { + panic(fmt.Sprintf("pointer to unknown type in field %d: %T", i, field.Interface())) + } + } + } + + return out +} + +var bigOne = big.NewInt(1) + +func parseString(in []byte) (out, rest []byte, ok bool) { + if len(in) < 4 { + return + } + length := binary.BigEndian.Uint32(in) + in = in[4:] + if uint32(len(in)) < length { + return + } + out = in[:length] + rest = in[length:] + ok = true + return +} + +var ( + comma = []byte{','} + emptyNameList = []string{} +) + +func parseNameList(in []byte) (out []string, rest []byte, ok bool) { + contents, rest, ok := parseString(in) + if !ok { + return + } + if len(contents) == 0 { + out = emptyNameList + return + } + parts := bytes.Split(contents, comma) + out = make([]string, len(parts)) + for i, part := range parts { + out[i] = string(part) + } + return +} + +func parseInt(in []byte) (out *big.Int, rest []byte, ok bool) { + contents, rest, ok := parseString(in) + if !ok { + return + } + out = new(big.Int) + + if len(contents) > 0 && contents[0]&0x80 == 0x80 { + // This is a negative number + notBytes := make([]byte, len(contents)) + for i := range notBytes { + notBytes[i] = ^contents[i] + } + out.SetBytes(notBytes) + out.Add(out, bigOne) + out.Neg(out) + } else { + // Positive number + out.SetBytes(contents) + } + ok = true + return +} + +func parseUint32(in []byte) (uint32, []byte, bool) { + if len(in) < 4 { + return 0, nil, false + } + return binary.BigEndian.Uint32(in), in[4:], true +} + +func parseUint64(in []byte) (uint64, []byte, bool) { + if len(in) < 8 { + return 0, nil, false + } + return binary.BigEndian.Uint64(in), in[8:], true +} + +func intLength(n *big.Int) int { + length := 4 /* length bytes */ + if n.Sign() < 0 { + nMinus1 := new(big.Int).Neg(n) + nMinus1.Sub(nMinus1, bigOne) + bitLen := nMinus1.BitLen() + if bitLen%8 == 0 { + // The number will need 0xff padding + length++ + } + length += (bitLen + 7) / 8 + } else if n.Sign() == 0 { + // A zero is the zero length string + } else { + bitLen := n.BitLen() + if bitLen%8 == 0 { + // The number will need 0x00 padding + length++ + } + length += (bitLen + 7) / 8 + } + + return length +} + +func marshalUint32(to []byte, n uint32) []byte { + binary.BigEndian.PutUint32(to, n) + return to[4:] +} + +func marshalUint64(to []byte, n uint64) []byte { + binary.BigEndian.PutUint64(to, n) + return to[8:] +} + +func marshalInt(to []byte, n *big.Int) []byte { + lengthBytes := to + to = to[4:] + length := 0 + + if n.Sign() < 0 { + // A negative number has to be converted to two's-complement + // form. So we'll subtract 1 and invert. If the + // most-significant-bit isn't set then we'll need to pad the + // beginning with 0xff in order to keep the number negative. + nMinus1 := new(big.Int).Neg(n) + nMinus1.Sub(nMinus1, bigOne) + bytes := nMinus1.Bytes() + for i := range bytes { + bytes[i] ^= 0xff + } + if len(bytes) == 0 || bytes[0]&0x80 == 0 { + to[0] = 0xff + to = to[1:] + length++ + } + nBytes := copy(to, bytes) + to = to[nBytes:] + length += nBytes + } else if n.Sign() == 0 { + // A zero is the zero length string + } else { + bytes := n.Bytes() + if len(bytes) > 0 && bytes[0]&0x80 != 0 { + // We'll have to pad this with a 0x00 in order to + // stop it looking like a negative number. + to[0] = 0 + to = to[1:] + length++ + } + nBytes := copy(to, bytes) + to = to[nBytes:] + length += nBytes + } + + lengthBytes[0] = byte(length >> 24) + lengthBytes[1] = byte(length >> 16) + lengthBytes[2] = byte(length >> 8) + lengthBytes[3] = byte(length) + return to +} + +func writeInt(w io.Writer, n *big.Int) { + length := intLength(n) + buf := make([]byte, length) + marshalInt(buf, n) + w.Write(buf) +} + +func writeString(w io.Writer, s []byte) { + var lengthBytes [4]byte + lengthBytes[0] = byte(len(s) >> 24) + lengthBytes[1] = byte(len(s) >> 16) + lengthBytes[2] = byte(len(s) >> 8) + lengthBytes[3] = byte(len(s)) + w.Write(lengthBytes[:]) + w.Write(s) +} + +func stringLength(n int) int { + return 4 + n +} + +func marshalString(to []byte, s []byte) []byte { + to[0] = byte(len(s) >> 24) + to[1] = byte(len(s) >> 16) + to[2] = byte(len(s) >> 8) + to[3] = byte(len(s)) + to = to[4:] + copy(to, s) + return to[len(s):] +} + +var bigIntType = reflect.TypeOf((*big.Int)(nil)) + +// Decode a packet into its corresponding message. +func decode(packet []byte) (interface{}, error) { + var msg interface{} + switch packet[0] { + case msgDisconnect: + msg = new(disconnectMsg) + case msgServiceRequest: + msg = new(serviceRequestMsg) + case msgServiceAccept: + msg = new(serviceAcceptMsg) + case msgKexInit: + msg = new(kexInitMsg) + case msgKexDHInit: + msg = new(kexDHInitMsg) + case msgKexDHReply: + msg = new(kexDHReplyMsg) + case msgUserAuthRequest: + msg = new(userAuthRequestMsg) + case msgUserAuthSuccess: + return new(userAuthSuccessMsg), nil + case msgUserAuthFailure: + msg = new(userAuthFailureMsg) + case msgUserAuthPubKeyOk: + msg = new(userAuthPubKeyOkMsg) + case msgGlobalRequest: + msg = new(globalRequestMsg) + case msgRequestSuccess: + msg = new(globalRequestSuccessMsg) + case msgRequestFailure: + msg = new(globalRequestFailureMsg) + case msgChannelOpen: + msg = new(channelOpenMsg) + case msgChannelData: + msg = new(channelDataMsg) + case msgChannelOpenConfirm: + msg = new(channelOpenConfirmMsg) + case msgChannelOpenFailure: + msg = new(channelOpenFailureMsg) + case msgChannelWindowAdjust: + msg = new(windowAdjustMsg) + case msgChannelEOF: + msg = new(channelEOFMsg) + case msgChannelClose: + msg = new(channelCloseMsg) + case msgChannelRequest: + msg = new(channelRequestMsg) + case msgChannelSuccess: + msg = new(channelRequestSuccessMsg) + case msgChannelFailure: + msg = new(channelRequestFailureMsg) + default: + return nil, unexpectedMessageError(0, packet[0]) + } + if err := Unmarshal(packet, msg); err != nil { + return nil, err + } + return msg, nil +} diff --git a/vendor/golang.org/x/crypto/ssh/messages_test.go b/vendor/golang.org/x/crypto/ssh/messages_test.go new file mode 100644 index 0000000..e790764 --- /dev/null +++ b/vendor/golang.org/x/crypto/ssh/messages_test.go @@ -0,0 +1,288 @@ +// Copyright 2011 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package ssh + +import ( + "bytes" + "math/big" + "math/rand" + "reflect" + "testing" + "testing/quick" +) + +var intLengthTests = []struct { + val, length int +}{ + {0, 4 + 0}, + {1, 4 + 1}, + {127, 4 + 1}, + {128, 4 + 2}, + {-1, 4 + 1}, +} + +func TestIntLength(t *testing.T) { + for _, test := range intLengthTests { + v := new(big.Int).SetInt64(int64(test.val)) + length := intLength(v) + if length != test.length { + t.Errorf("For %d, got length %d but expected %d", test.val, length, test.length) + } + } +} + +type msgAllTypes struct { + Bool bool `sshtype:"21"` + Array [16]byte + Uint64 uint64 + Uint32 uint32 + Uint8 uint8 + String string + Strings []string + Bytes []byte + Int *big.Int + Rest []byte `ssh:"rest"` +} + +func (t *msgAllTypes) Generate(rand *rand.Rand, size int) reflect.Value { + m := &msgAllTypes{} + m.Bool = rand.Intn(2) == 1 + randomBytes(m.Array[:], rand) + m.Uint64 = uint64(rand.Int63n(1<<63 - 1)) + m.Uint32 = uint32(rand.Intn((1 << 31) - 1)) + m.Uint8 = uint8(rand.Intn(1 << 8)) + m.String = string(m.Array[:]) + m.Strings = randomNameList(rand) + m.Bytes = m.Array[:] + m.Int = randomInt(rand) + m.Rest = m.Array[:] + return reflect.ValueOf(m) +} + +func TestMarshalUnmarshal(t *testing.T) { + rand := rand.New(rand.NewSource(0)) + iface := &msgAllTypes{} + ty := reflect.ValueOf(iface).Type() + + n := 100 + if testing.Short() { + n = 5 + } + for j := 0; j < n; j++ { + v, ok := quick.Value(ty, rand) + if !ok { + t.Errorf("failed to create value") + break + } + + m1 := v.Elem().Interface() + m2 := iface + + marshaled := Marshal(m1) + if err := Unmarshal(marshaled, m2); err != nil { + t.Errorf("Unmarshal %#v: %s", m1, err) + break + } + + if !reflect.DeepEqual(v.Interface(), m2) { + t.Errorf("got: %#v\nwant:%#v\n%x", m2, m1, marshaled) + break + } + } +} + +func TestUnmarshalEmptyPacket(t *testing.T) { + var b []byte + var m channelRequestSuccessMsg + if err := Unmarshal(b, &m); err == nil { + t.Fatalf("unmarshal of empty slice succeeded") + } +} + +func TestUnmarshalUnexpectedPacket(t *testing.T) { + type S struct { + I uint32 `sshtype:"43"` + S string + B bool + } + + s := S{11, "hello", true} + packet := Marshal(s) + packet[0] = 42 + roundtrip := S{} + err := Unmarshal(packet, &roundtrip) + if err == nil { + t.Fatal("expected error, not nil") + } +} + +func TestMarshalPtr(t *testing.T) { + s := struct { + S string + }{"hello"} + + m1 := Marshal(s) + m2 := Marshal(&s) + if !bytes.Equal(m1, m2) { + t.Errorf("got %q, want %q for marshaled pointer", m2, m1) + } +} + +func TestBareMarshalUnmarshal(t *testing.T) { + type S struct { + I uint32 + S string + B bool + } + + s := S{42, "hello", true} + packet := Marshal(s) + roundtrip := S{} + Unmarshal(packet, &roundtrip) + + if !reflect.DeepEqual(s, roundtrip) { + t.Errorf("got %#v, want %#v", roundtrip, s) + } +} + +func TestBareMarshal(t *testing.T) { + type S2 struct { + I uint32 + } + s := S2{42} + packet := Marshal(s) + i, rest, ok := parseUint32(packet) + if len(rest) > 0 || !ok { + t.Errorf("parseInt(%q): parse error", packet) + } + if i != s.I { + t.Errorf("got %d, want %d", i, s.I) + } +} + +func TestUnmarshalShortKexInitPacket(t *testing.T) { + // This used to panic. + // Issue 11348 + packet := []byte{0x14, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0xff, 0xff, 0xff, 0xff} + kim := &kexInitMsg{} + if err := Unmarshal(packet, kim); err == nil { + t.Error("truncated packet unmarshaled without error") + } +} + +func TestMarshalMultiTag(t *testing.T) { + var res struct { + A uint32 `sshtype:"1|2"` + } + + good1 := struct { + A uint32 `sshtype:"1"` + }{ + 1, + } + good2 := struct { + A uint32 `sshtype:"2"` + }{ + 1, + } + + if e := Unmarshal(Marshal(good1), &res); e != nil { + t.Errorf("error unmarshaling multipart tag: %v", e) + } + + if e := Unmarshal(Marshal(good2), &res); e != nil { + t.Errorf("error unmarshaling multipart tag: %v", e) + } + + bad1 := struct { + A uint32 `sshtype:"3"` + }{ + 1, + } + if e := Unmarshal(Marshal(bad1), &res); e == nil { + t.Errorf("bad struct unmarshaled without error") + } +} + +func randomBytes(out []byte, rand *rand.Rand) { + for i := 0; i < len(out); i++ { + out[i] = byte(rand.Int31()) + } +} + +func randomNameList(rand *rand.Rand) []string { + ret := make([]string, rand.Int31()&15) + for i := range ret { + s := make([]byte, 1+(rand.Int31()&15)) + for j := range s { + s[j] = 'a' + uint8(rand.Int31()&15) + } + ret[i] = string(s) + } + return ret +} + +func randomInt(rand *rand.Rand) *big.Int { + return new(big.Int).SetInt64(int64(int32(rand.Uint32()))) +} + +func (*kexInitMsg) Generate(rand *rand.Rand, size int) reflect.Value { + ki := &kexInitMsg{} + randomBytes(ki.Cookie[:], rand) + ki.KexAlgos = randomNameList(rand) + ki.ServerHostKeyAlgos = randomNameList(rand) + ki.CiphersClientServer = randomNameList(rand) + ki.CiphersServerClient = randomNameList(rand) + ki.MACsClientServer = randomNameList(rand) + ki.MACsServerClient = randomNameList(rand) + ki.CompressionClientServer = randomNameList(rand) + ki.CompressionServerClient = randomNameList(rand) + ki.LanguagesClientServer = randomNameList(rand) + ki.LanguagesServerClient = randomNameList(rand) + if rand.Int31()&1 == 1 { + ki.FirstKexFollows = true + } + return reflect.ValueOf(ki) +} + +func (*kexDHInitMsg) Generate(rand *rand.Rand, size int) reflect.Value { + dhi := &kexDHInitMsg{} + dhi.X = randomInt(rand) + return reflect.ValueOf(dhi) +} + +var ( + _kexInitMsg = new(kexInitMsg).Generate(rand.New(rand.NewSource(0)), 10).Elem().Interface() + _kexDHInitMsg = new(kexDHInitMsg).Generate(rand.New(rand.NewSource(0)), 10).Elem().Interface() + + _kexInit = Marshal(_kexInitMsg) + _kexDHInit = Marshal(_kexDHInitMsg) +) + +func BenchmarkMarshalKexInitMsg(b *testing.B) { + for i := 0; i < b.N; i++ { + Marshal(_kexInitMsg) + } +} + +func BenchmarkUnmarshalKexInitMsg(b *testing.B) { + m := new(kexInitMsg) + for i := 0; i < b.N; i++ { + Unmarshal(_kexInit, m) + } +} + +func BenchmarkMarshalKexDHInitMsg(b *testing.B) { + for i := 0; i < b.N; i++ { + Marshal(_kexDHInitMsg) + } +} + +func BenchmarkUnmarshalKexDHInitMsg(b *testing.B) { + m := new(kexDHInitMsg) + for i := 0; i < b.N; i++ { + Unmarshal(_kexDHInit, m) + } +} diff --git a/vendor/golang.org/x/crypto/ssh/mux.go b/vendor/golang.org/x/crypto/ssh/mux.go new file mode 100644 index 0000000..27a527c --- /dev/null +++ b/vendor/golang.org/x/crypto/ssh/mux.go @@ -0,0 +1,330 @@ +// Copyright 2013 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package ssh + +import ( + "encoding/binary" + "fmt" + "io" + "log" + "sync" + "sync/atomic" +) + +// debugMux, if set, causes messages in the connection protocol to be +// logged. +const debugMux = false + +// chanList is a thread safe channel list. +type chanList struct { + // protects concurrent access to chans + sync.Mutex + + // chans are indexed by the local id of the channel, which the + // other side should send in the PeersId field. + chans []*channel + + // This is a debugging aid: it offsets all IDs by this + // amount. This helps distinguish otherwise identical + // server/client muxes + offset uint32 +} + +// Assigns a channel ID to the given channel. +func (c *chanList) add(ch *channel) uint32 { + c.Lock() + defer c.Unlock() + for i := range c.chans { + if c.chans[i] == nil { + c.chans[i] = ch + return uint32(i) + c.offset + } + } + c.chans = append(c.chans, ch) + return uint32(len(c.chans)-1) + c.offset +} + +// getChan returns the channel for the given ID. +func (c *chanList) getChan(id uint32) *channel { + id -= c.offset + + c.Lock() + defer c.Unlock() + if id < uint32(len(c.chans)) { + return c.chans[id] + } + return nil +} + +func (c *chanList) remove(id uint32) { + id -= c.offset + c.Lock() + if id < uint32(len(c.chans)) { + c.chans[id] = nil + } + c.Unlock() +} + +// dropAll forgets all channels it knows, returning them in a slice. +func (c *chanList) dropAll() []*channel { + c.Lock() + defer c.Unlock() + var r []*channel + + for _, ch := range c.chans { + if ch == nil { + continue + } + r = append(r, ch) + } + c.chans = nil + return r +} + +// mux represents the state for the SSH connection protocol, which +// multiplexes many channels onto a single packet transport. +type mux struct { + conn packetConn + chanList chanList + + incomingChannels chan NewChannel + + globalSentMu sync.Mutex + globalResponses chan interface{} + incomingRequests chan *Request + + errCond *sync.Cond + err error +} + +// When debugging, each new chanList instantiation has a different +// offset. +var globalOff uint32 + +func (m *mux) Wait() error { + m.errCond.L.Lock() + defer m.errCond.L.Unlock() + for m.err == nil { + m.errCond.Wait() + } + return m.err +} + +// newMux returns a mux that runs over the given connection. +func newMux(p packetConn) *mux { + m := &mux{ + conn: p, + incomingChannels: make(chan NewChannel, chanSize), + globalResponses: make(chan interface{}, 1), + incomingRequests: make(chan *Request, chanSize), + errCond: newCond(), + } + if debugMux { + m.chanList.offset = atomic.AddUint32(&globalOff, 1) + } + + go m.loop() + return m +} + +func (m *mux) sendMessage(msg interface{}) error { + p := Marshal(msg) + if debugMux { + log.Printf("send global(%d): %#v", m.chanList.offset, msg) + } + return m.conn.writePacket(p) +} + +func (m *mux) SendRequest(name string, wantReply bool, payload []byte) (bool, []byte, error) { + if wantReply { + m.globalSentMu.Lock() + defer m.globalSentMu.Unlock() + } + + if err := m.sendMessage(globalRequestMsg{ + Type: name, + WantReply: wantReply, + Data: payload, + }); err != nil { + return false, nil, err + } + + if !wantReply { + return false, nil, nil + } + + msg, ok := <-m.globalResponses + if !ok { + return false, nil, io.EOF + } + switch msg := msg.(type) { + case *globalRequestFailureMsg: + return false, msg.Data, nil + case *globalRequestSuccessMsg: + return true, msg.Data, nil + default: + return false, nil, fmt.Errorf("ssh: unexpected response to request: %#v", msg) + } +} + +// ackRequest must be called after processing a global request that +// has WantReply set. +func (m *mux) ackRequest(ok bool, data []byte) error { + if ok { + return m.sendMessage(globalRequestSuccessMsg{Data: data}) + } + return m.sendMessage(globalRequestFailureMsg{Data: data}) +} + +func (m *mux) Close() error { + return m.conn.Close() +} + +// loop runs the connection machine. It will process packets until an +// error is encountered. To synchronize on loop exit, use mux.Wait. +func (m *mux) loop() { + var err error + for err == nil { + err = m.onePacket() + } + + for _, ch := range m.chanList.dropAll() { + ch.close() + } + + close(m.incomingChannels) + close(m.incomingRequests) + close(m.globalResponses) + + m.conn.Close() + + m.errCond.L.Lock() + m.err = err + m.errCond.Broadcast() + m.errCond.L.Unlock() + + if debugMux { + log.Println("loop exit", err) + } +} + +// onePacket reads and processes one packet. +func (m *mux) onePacket() error { + packet, err := m.conn.readPacket() + if err != nil { + return err + } + + if debugMux { + if packet[0] == msgChannelData || packet[0] == msgChannelExtendedData { + log.Printf("decoding(%d): data packet - %d bytes", m.chanList.offset, len(packet)) + } else { + p, _ := decode(packet) + log.Printf("decoding(%d): %d %#v - %d bytes", m.chanList.offset, packet[0], p, len(packet)) + } + } + + switch packet[0] { + case msgChannelOpen: + return m.handleChannelOpen(packet) + case msgGlobalRequest, msgRequestSuccess, msgRequestFailure: + return m.handleGlobalPacket(packet) + } + + // assume a channel packet. + if len(packet) < 5 { + return parseError(packet[0]) + } + id := binary.BigEndian.Uint32(packet[1:]) + ch := m.chanList.getChan(id) + if ch == nil { + return fmt.Errorf("ssh: invalid channel %d", id) + } + + return ch.handlePacket(packet) +} + +func (m *mux) handleGlobalPacket(packet []byte) error { + msg, err := decode(packet) + if err != nil { + return err + } + + switch msg := msg.(type) { + case *globalRequestMsg: + m.incomingRequests <- &Request{ + Type: msg.Type, + WantReply: msg.WantReply, + Payload: msg.Data, + mux: m, + } + case *globalRequestSuccessMsg, *globalRequestFailureMsg: + m.globalResponses <- msg + default: + panic(fmt.Sprintf("not a global message %#v", msg)) + } + + return nil +} + +// handleChannelOpen schedules a channel to be Accept()ed. +func (m *mux) handleChannelOpen(packet []byte) error { + var msg channelOpenMsg + if err := Unmarshal(packet, &msg); err != nil { + return err + } + + if msg.MaxPacketSize < minPacketLength || msg.MaxPacketSize > 1<<31 { + failMsg := channelOpenFailureMsg{ + PeersId: msg.PeersId, + Reason: ConnectionFailed, + Message: "invalid request", + Language: "en_US.UTF-8", + } + return m.sendMessage(failMsg) + } + + c := m.newChannel(msg.ChanType, channelInbound, msg.TypeSpecificData) + c.remoteId = msg.PeersId + c.maxRemotePayload = msg.MaxPacketSize + c.remoteWin.add(msg.PeersWindow) + m.incomingChannels <- c + return nil +} + +func (m *mux) OpenChannel(chanType string, extra []byte) (Channel, <-chan *Request, error) { + ch, err := m.openChannel(chanType, extra) + if err != nil { + return nil, nil, err + } + + return ch, ch.incomingRequests, nil +} + +func (m *mux) openChannel(chanType string, extra []byte) (*channel, error) { + ch := m.newChannel(chanType, channelOutbound, extra) + + ch.maxIncomingPayload = channelMaxPacket + + open := channelOpenMsg{ + ChanType: chanType, + PeersWindow: ch.myWindow, + MaxPacketSize: ch.maxIncomingPayload, + TypeSpecificData: extra, + PeersId: ch.localId, + } + if err := m.sendMessage(open); err != nil { + return nil, err + } + + switch msg := (<-ch.msg).(type) { + case *channelOpenConfirmMsg: + return ch, nil + case *channelOpenFailureMsg: + return nil, &OpenChannelError{msg.Reason, msg.Message} + default: + return nil, fmt.Errorf("ssh: unexpected packet in response to channel open: %T", msg) + } +} diff --git a/vendor/golang.org/x/crypto/ssh/mux_test.go b/vendor/golang.org/x/crypto/ssh/mux_test.go new file mode 100644 index 0000000..25d2181 --- /dev/null +++ b/vendor/golang.org/x/crypto/ssh/mux_test.go @@ -0,0 +1,505 @@ +// Copyright 2013 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package ssh + +import ( + "io" + "io/ioutil" + "sync" + "testing" +) + +func muxPair() (*mux, *mux) { + a, b := memPipe() + + s := newMux(a) + c := newMux(b) + + return s, c +} + +// Returns both ends of a channel, and the mux for the the 2nd +// channel. +func channelPair(t *testing.T) (*channel, *channel, *mux) { + c, s := muxPair() + + res := make(chan *channel, 1) + go func() { + newCh, ok := <-s.incomingChannels + if !ok { + t.Fatalf("No incoming channel") + } + if newCh.ChannelType() != "chan" { + t.Fatalf("got type %q want chan", newCh.ChannelType()) + } + ch, _, err := newCh.Accept() + if err != nil { + t.Fatalf("Accept %v", err) + } + res <- ch.(*channel) + }() + + ch, err := c.openChannel("chan", nil) + if err != nil { + t.Fatalf("OpenChannel: %v", err) + } + + return <-res, ch, c +} + +// Test that stderr and stdout can be addressed from different +// goroutines. This is intended for use with the race detector. +func TestMuxChannelExtendedThreadSafety(t *testing.T) { + writer, reader, mux := channelPair(t) + defer writer.Close() + defer reader.Close() + defer mux.Close() + + var wr, rd sync.WaitGroup + magic := "hello world" + + wr.Add(2) + go func() { + io.WriteString(writer, magic) + wr.Done() + }() + go func() { + io.WriteString(writer.Stderr(), magic) + wr.Done() + }() + + rd.Add(2) + go func() { + c, err := ioutil.ReadAll(reader) + if string(c) != magic { + t.Fatalf("stdout read got %q, want %q (error %s)", c, magic, err) + } + rd.Done() + }() + go func() { + c, err := ioutil.ReadAll(reader.Stderr()) + if string(c) != magic { + t.Fatalf("stderr read got %q, want %q (error %s)", c, magic, err) + } + rd.Done() + }() + + wr.Wait() + writer.CloseWrite() + rd.Wait() +} + +func TestMuxReadWrite(t *testing.T) { + s, c, mux := channelPair(t) + defer s.Close() + defer c.Close() + defer mux.Close() + + magic := "hello world" + magicExt := "hello stderr" + go func() { + _, err := s.Write([]byte(magic)) + if err != nil { + t.Fatalf("Write: %v", err) + } + _, err = s.Extended(1).Write([]byte(magicExt)) + if err != nil { + t.Fatalf("Write: %v", err) + } + err = s.Close() + if err != nil { + t.Fatalf("Close: %v", err) + } + }() + + var buf [1024]byte + n, err := c.Read(buf[:]) + if err != nil { + t.Fatalf("server Read: %v", err) + } + got := string(buf[:n]) + if got != magic { + t.Fatalf("server: got %q want %q", got, magic) + } + + n, err = c.Extended(1).Read(buf[:]) + if err != nil { + t.Fatalf("server Read: %v", err) + } + + got = string(buf[:n]) + if got != magicExt { + t.Fatalf("server: got %q want %q", got, magic) + } +} + +func TestMuxChannelOverflow(t *testing.T) { + reader, writer, mux := channelPair(t) + defer reader.Close() + defer writer.Close() + defer mux.Close() + + wDone := make(chan int, 1) + go func() { + if _, err := writer.Write(make([]byte, channelWindowSize)); err != nil { + t.Errorf("could not fill window: %v", err) + } + writer.Write(make([]byte, 1)) + wDone <- 1 + }() + writer.remoteWin.waitWriterBlocked() + + // Send 1 byte. + packet := make([]byte, 1+4+4+1) + packet[0] = msgChannelData + marshalUint32(packet[1:], writer.remoteId) + marshalUint32(packet[5:], uint32(1)) + packet[9] = 42 + + if err := writer.mux.conn.writePacket(packet); err != nil { + t.Errorf("could not send packet") + } + if _, err := reader.SendRequest("hello", true, nil); err == nil { + t.Errorf("SendRequest succeeded.") + } + <-wDone +} + +func TestMuxChannelCloseWriteUnblock(t *testing.T) { + reader, writer, mux := channelPair(t) + defer reader.Close() + defer writer.Close() + defer mux.Close() + + wDone := make(chan int, 1) + go func() { + if _, err := writer.Write(make([]byte, channelWindowSize)); err != nil { + t.Errorf("could not fill window: %v", err) + } + if _, err := writer.Write(make([]byte, 1)); err != io.EOF { + t.Errorf("got %v, want EOF for unblock write", err) + } + wDone <- 1 + }() + + writer.remoteWin.waitWriterBlocked() + reader.Close() + <-wDone +} + +func TestMuxConnectionCloseWriteUnblock(t *testing.T) { + reader, writer, mux := channelPair(t) + defer reader.Close() + defer writer.Close() + defer mux.Close() + + wDone := make(chan int, 1) + go func() { + if _, err := writer.Write(make([]byte, channelWindowSize)); err != nil { + t.Errorf("could not fill window: %v", err) + } + if _, err := writer.Write(make([]byte, 1)); err != io.EOF { + t.Errorf("got %v, want EOF for unblock write", err) + } + wDone <- 1 + }() + + writer.remoteWin.waitWriterBlocked() + mux.Close() + <-wDone +} + +func TestMuxReject(t *testing.T) { + client, server := muxPair() + defer server.Close() + defer client.Close() + + go func() { + ch, ok := <-server.incomingChannels + if !ok { + t.Fatalf("Accept") + } + if ch.ChannelType() != "ch" || string(ch.ExtraData()) != "extra" { + t.Fatalf("unexpected channel: %q, %q", ch.ChannelType(), ch.ExtraData()) + } + ch.Reject(RejectionReason(42), "message") + }() + + ch, err := client.openChannel("ch", []byte("extra")) + if ch != nil { + t.Fatal("openChannel not rejected") + } + + ocf, ok := err.(*OpenChannelError) + if !ok { + t.Errorf("got %#v want *OpenChannelError", err) + } else if ocf.Reason != 42 || ocf.Message != "message" { + t.Errorf("got %#v, want {Reason: 42, Message: %q}", ocf, "message") + } + + want := "ssh: rejected: unknown reason 42 (message)" + if err.Error() != want { + t.Errorf("got %q, want %q", err.Error(), want) + } +} + +func TestMuxChannelRequest(t *testing.T) { + client, server, mux := channelPair(t) + defer server.Close() + defer client.Close() + defer mux.Close() + + var received int + var wg sync.WaitGroup + wg.Add(1) + go func() { + for r := range server.incomingRequests { + received++ + r.Reply(r.Type == "yes", nil) + } + wg.Done() + }() + _, err := client.SendRequest("yes", false, nil) + if err != nil { + t.Fatalf("SendRequest: %v", err) + } + ok, err := client.SendRequest("yes", true, nil) + if err != nil { + t.Fatalf("SendRequest: %v", err) + } + + if !ok { + t.Errorf("SendRequest(yes): %v", ok) + + } + + ok, err = client.SendRequest("no", true, nil) + if err != nil { + t.Fatalf("SendRequest: %v", err) + } + if ok { + t.Errorf("SendRequest(no): %v", ok) + + } + + client.Close() + wg.Wait() + + if received != 3 { + t.Errorf("got %d requests, want %d", received, 3) + } +} + +func TestMuxGlobalRequest(t *testing.T) { + clientMux, serverMux := muxPair() + defer serverMux.Close() + defer clientMux.Close() + + var seen bool + go func() { + for r := range serverMux.incomingRequests { + seen = seen || r.Type == "peek" + if r.WantReply { + err := r.Reply(r.Type == "yes", + append([]byte(r.Type), r.Payload...)) + if err != nil { + t.Errorf("AckRequest: %v", err) + } + } + } + }() + + _, _, err := clientMux.SendRequest("peek", false, nil) + if err != nil { + t.Errorf("SendRequest: %v", err) + } + + ok, data, err := clientMux.SendRequest("yes", true, []byte("a")) + if !ok || string(data) != "yesa" || err != nil { + t.Errorf("SendRequest(\"yes\", true, \"a\"): %v %v %v", + ok, data, err) + } + if ok, data, err := clientMux.SendRequest("yes", true, []byte("a")); !ok || string(data) != "yesa" || err != nil { + t.Errorf("SendRequest(\"yes\", true, \"a\"): %v %v %v", + ok, data, err) + } + + if ok, data, err := clientMux.SendRequest("no", true, []byte("a")); ok || string(data) != "noa" || err != nil { + t.Errorf("SendRequest(\"no\", true, \"a\"): %v %v %v", + ok, data, err) + } + + if !seen { + t.Errorf("never saw 'peek' request") + } +} + +func TestMuxGlobalRequestUnblock(t *testing.T) { + clientMux, serverMux := muxPair() + defer serverMux.Close() + defer clientMux.Close() + + result := make(chan error, 1) + go func() { + _, _, err := clientMux.SendRequest("hello", true, nil) + result <- err + }() + + <-serverMux.incomingRequests + serverMux.conn.Close() + err := <-result + + if err != io.EOF { + t.Errorf("want EOF, got %v", io.EOF) + } +} + +func TestMuxChannelRequestUnblock(t *testing.T) { + a, b, connB := channelPair(t) + defer a.Close() + defer b.Close() + defer connB.Close() + + result := make(chan error, 1) + go func() { + _, err := a.SendRequest("hello", true, nil) + result <- err + }() + + <-b.incomingRequests + connB.conn.Close() + err := <-result + + if err != io.EOF { + t.Errorf("want EOF, got %v", err) + } +} + +func TestMuxCloseChannel(t *testing.T) { + r, w, mux := channelPair(t) + defer mux.Close() + defer r.Close() + defer w.Close() + + result := make(chan error, 1) + go func() { + var b [1024]byte + _, err := r.Read(b[:]) + result <- err + }() + if err := w.Close(); err != nil { + t.Errorf("w.Close: %v", err) + } + + if _, err := w.Write([]byte("hello")); err != io.EOF { + t.Errorf("got err %v, want io.EOF after Close", err) + } + + if err := <-result; err != io.EOF { + t.Errorf("got %v (%T), want io.EOF", err, err) + } +} + +func TestMuxCloseWriteChannel(t *testing.T) { + r, w, mux := channelPair(t) + defer mux.Close() + + result := make(chan error, 1) + go func() { + var b [1024]byte + _, err := r.Read(b[:]) + result <- err + }() + if err := w.CloseWrite(); err != nil { + t.Errorf("w.CloseWrite: %v", err) + } + + if _, err := w.Write([]byte("hello")); err != io.EOF { + t.Errorf("got err %v, want io.EOF after CloseWrite", err) + } + + if err := <-result; err != io.EOF { + t.Errorf("got %v (%T), want io.EOF", err, err) + } +} + +func TestMuxInvalidRecord(t *testing.T) { + a, b := muxPair() + defer a.Close() + defer b.Close() + + packet := make([]byte, 1+4+4+1) + packet[0] = msgChannelData + marshalUint32(packet[1:], 29348723 /* invalid channel id */) + marshalUint32(packet[5:], 1) + packet[9] = 42 + + a.conn.writePacket(packet) + go a.SendRequest("hello", false, nil) + // 'a' wrote an invalid packet, so 'b' has exited. + req, ok := <-b.incomingRequests + if ok { + t.Errorf("got request %#v after receiving invalid packet", req) + } +} + +func TestZeroWindowAdjust(t *testing.T) { + a, b, mux := channelPair(t) + defer a.Close() + defer b.Close() + defer mux.Close() + + go func() { + io.WriteString(a, "hello") + // bogus adjust. + a.sendMessage(windowAdjustMsg{}) + io.WriteString(a, "world") + a.Close() + }() + + want := "helloworld" + c, _ := ioutil.ReadAll(b) + if string(c) != want { + t.Errorf("got %q want %q", c, want) + } +} + +func TestMuxMaxPacketSize(t *testing.T) { + a, b, mux := channelPair(t) + defer a.Close() + defer b.Close() + defer mux.Close() + + large := make([]byte, a.maxRemotePayload+1) + packet := make([]byte, 1+4+4+1+len(large)) + packet[0] = msgChannelData + marshalUint32(packet[1:], a.remoteId) + marshalUint32(packet[5:], uint32(len(large))) + packet[9] = 42 + + if err := a.mux.conn.writePacket(packet); err != nil { + t.Errorf("could not send packet") + } + + go a.SendRequest("hello", false, nil) + + _, ok := <-b.incomingRequests + if ok { + t.Errorf("connection still alive after receiving large packet.") + } +} + +// Don't ship code with debug=true. +func TestDebug(t *testing.T) { + if debugMux { + t.Error("mux debug switched on") + } + if debugHandshake { + t.Error("handshake debug switched on") + } + if debugTransport { + t.Error("transport debug switched on") + } +} diff --git a/vendor/golang.org/x/crypto/ssh/server.go b/vendor/golang.org/x/crypto/ssh/server.go new file mode 100644 index 0000000..b6f4cc8 --- /dev/null +++ b/vendor/golang.org/x/crypto/ssh/server.go @@ -0,0 +1,563 @@ +// Copyright 2011 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package ssh + +import ( + "bytes" + "errors" + "fmt" + "io" + "net" + "strings" +) + +// The Permissions type holds fine-grained permissions that are +// specific to a user or a specific authentication method for a user. +// The Permissions value for a successful authentication attempt is +// available in ServerConn, so it can be used to pass information from +// the user-authentication phase to the application layer. +type Permissions struct { + // CriticalOptions indicate restrictions to the default + // permissions, and are typically used in conjunction with + // user certificates. The standard for SSH certificates + // defines "force-command" (only allow the given command to + // execute) and "source-address" (only allow connections from + // the given address). The SSH package currently only enforces + // the "source-address" critical option. It is up to server + // implementations to enforce other critical options, such as + // "force-command", by checking them after the SSH handshake + // is successful. In general, SSH servers should reject + // connections that specify critical options that are unknown + // or not supported. + CriticalOptions map[string]string + + // Extensions are extra functionality that the server may + // offer on authenticated connections. Lack of support for an + // extension does not preclude authenticating a user. Common + // extensions are "permit-agent-forwarding", + // "permit-X11-forwarding". The Go SSH library currently does + // not act on any extension, and it is up to server + // implementations to honor them. Extensions can be used to + // pass data from the authentication callbacks to the server + // application layer. + Extensions map[string]string +} + +// ServerConfig holds server specific configuration data. +type ServerConfig struct { + // Config contains configuration shared between client and server. + Config + + hostKeys []Signer + + // NoClientAuth is true if clients are allowed to connect without + // authenticating. + NoClientAuth bool + + // MaxAuthTries specifies the maximum number of authentication attempts + // permitted per connection. If set to a negative number, the number of + // attempts are unlimited. If set to zero, the number of attempts are limited + // to 6. + MaxAuthTries int + + // PasswordCallback, if non-nil, is called when a user + // attempts to authenticate using a password. + PasswordCallback func(conn ConnMetadata, password []byte) (*Permissions, error) + + // PublicKeyCallback, if non-nil, is called when a client + // offers a public key for authentication. It must return true + // if the given public key can be used to authenticate the + // given user. For example, see CertChecker.Authenticate. A + // call to this function does not guarantee that the key + // offered is in fact used to authenticate. To record any data + // depending on the public key, store it inside a + // Permissions.Extensions entry. + PublicKeyCallback func(conn ConnMetadata, key PublicKey) (*Permissions, error) + + // KeyboardInteractiveCallback, if non-nil, is called when + // keyboard-interactive authentication is selected (RFC + // 4256). The client object's Challenge function should be + // used to query the user. The callback may offer multiple + // Challenge rounds. To avoid information leaks, the client + // should be presented a challenge even if the user is + // unknown. + KeyboardInteractiveCallback func(conn ConnMetadata, client KeyboardInteractiveChallenge) (*Permissions, error) + + // AuthLogCallback, if non-nil, is called to log all authentication + // attempts. + AuthLogCallback func(conn ConnMetadata, method string, err error) + + // ServerVersion is the version identification string to announce in + // the public handshake. + // If empty, a reasonable default is used. + // Note that RFC 4253 section 4.2 requires that this string start with + // "SSH-2.0-". + ServerVersion string +} + +// AddHostKey adds a private key as a host key. If an existing host +// key exists with the same algorithm, it is overwritten. Each server +// config must have at least one host key. +func (s *ServerConfig) AddHostKey(key Signer) { + for i, k := range s.hostKeys { + if k.PublicKey().Type() == key.PublicKey().Type() { + s.hostKeys[i] = key + return + } + } + + s.hostKeys = append(s.hostKeys, key) +} + +// cachedPubKey contains the results of querying whether a public key is +// acceptable for a user. +type cachedPubKey struct { + user string + pubKeyData []byte + result error + perms *Permissions +} + +const maxCachedPubKeys = 16 + +// pubKeyCache caches tests for public keys. Since SSH clients +// will query whether a public key is acceptable before attempting to +// authenticate with it, we end up with duplicate queries for public +// key validity. The cache only applies to a single ServerConn. +type pubKeyCache struct { + keys []cachedPubKey +} + +// get returns the result for a given user/algo/key tuple. +func (c *pubKeyCache) get(user string, pubKeyData []byte) (cachedPubKey, bool) { + for _, k := range c.keys { + if k.user == user && bytes.Equal(k.pubKeyData, pubKeyData) { + return k, true + } + } + return cachedPubKey{}, false +} + +// add adds the given tuple to the cache. +func (c *pubKeyCache) add(candidate cachedPubKey) { + if len(c.keys) < maxCachedPubKeys { + c.keys = append(c.keys, candidate) + } +} + +// ServerConn is an authenticated SSH connection, as seen from the +// server +type ServerConn struct { + Conn + + // If the succeeding authentication callback returned a + // non-nil Permissions pointer, it is stored here. + Permissions *Permissions +} + +// NewServerConn starts a new SSH server with c as the underlying +// transport. It starts with a handshake and, if the handshake is +// unsuccessful, it closes the connection and returns an error. The +// Request and NewChannel channels must be serviced, or the connection +// will hang. +func NewServerConn(c net.Conn, config *ServerConfig) (*ServerConn, <-chan NewChannel, <-chan *Request, error) { + fullConf := *config + fullConf.SetDefaults() + if fullConf.MaxAuthTries == 0 { + fullConf.MaxAuthTries = 6 + } + + s := &connection{ + sshConn: sshConn{conn: c}, + } + perms, err := s.serverHandshake(&fullConf) + if err != nil { + c.Close() + return nil, nil, nil, err + } + return &ServerConn{s, perms}, s.mux.incomingChannels, s.mux.incomingRequests, nil +} + +// signAndMarshal signs the data with the appropriate algorithm, +// and serializes the result in SSH wire format. +func signAndMarshal(k Signer, rand io.Reader, data []byte) ([]byte, error) { + sig, err := k.Sign(rand, data) + if err != nil { + return nil, err + } + + return Marshal(sig), nil +} + +// handshake performs key exchange and user authentication. +func (s *connection) serverHandshake(config *ServerConfig) (*Permissions, error) { + if len(config.hostKeys) == 0 { + return nil, errors.New("ssh: server has no host keys") + } + + if !config.NoClientAuth && config.PasswordCallback == nil && config.PublicKeyCallback == nil && config.KeyboardInteractiveCallback == nil { + return nil, errors.New("ssh: no authentication methods configured but NoClientAuth is also false") + } + + if config.ServerVersion != "" { + s.serverVersion = []byte(config.ServerVersion) + } else { + s.serverVersion = []byte(packageVersion) + } + var err error + s.clientVersion, err = exchangeVersions(s.sshConn.conn, s.serverVersion) + if err != nil { + return nil, err + } + + tr := newTransport(s.sshConn.conn, config.Rand, false /* not client */) + s.transport = newServerTransport(tr, s.clientVersion, s.serverVersion, config) + + if err := s.transport.waitSession(); err != nil { + return nil, err + } + + // We just did the key change, so the session ID is established. + s.sessionID = s.transport.getSessionID() + + var packet []byte + if packet, err = s.transport.readPacket(); err != nil { + return nil, err + } + + var serviceRequest serviceRequestMsg + if err = Unmarshal(packet, &serviceRequest); err != nil { + return nil, err + } + if serviceRequest.Service != serviceUserAuth { + return nil, errors.New("ssh: requested service '" + serviceRequest.Service + "' before authenticating") + } + serviceAccept := serviceAcceptMsg{ + Service: serviceUserAuth, + } + if err := s.transport.writePacket(Marshal(&serviceAccept)); err != nil { + return nil, err + } + + perms, err := s.serverAuthenticate(config) + if err != nil { + return nil, err + } + s.mux = newMux(s.transport) + return perms, err +} + +func isAcceptableAlgo(algo string) bool { + switch algo { + case KeyAlgoRSA, KeyAlgoDSA, KeyAlgoECDSA256, KeyAlgoECDSA384, KeyAlgoECDSA521, KeyAlgoED25519, + CertAlgoRSAv01, CertAlgoDSAv01, CertAlgoECDSA256v01, CertAlgoECDSA384v01, CertAlgoECDSA521v01: + return true + } + return false +} + +func checkSourceAddress(addr net.Addr, sourceAddrs string) error { + if addr == nil { + return errors.New("ssh: no address known for client, but source-address match required") + } + + tcpAddr, ok := addr.(*net.TCPAddr) + if !ok { + return fmt.Errorf("ssh: remote address %v is not an TCP address when checking source-address match", addr) + } + + for _, sourceAddr := range strings.Split(sourceAddrs, ",") { + if allowedIP := net.ParseIP(sourceAddr); allowedIP != nil { + if allowedIP.Equal(tcpAddr.IP) { + return nil + } + } else { + _, ipNet, err := net.ParseCIDR(sourceAddr) + if err != nil { + return fmt.Errorf("ssh: error parsing source-address restriction %q: %v", sourceAddr, err) + } + + if ipNet.Contains(tcpAddr.IP) { + return nil + } + } + } + + return fmt.Errorf("ssh: remote address %v is not allowed because of source-address restriction", addr) +} + +// ServerAuthError implements the error interface. It appends any authentication +// errors that may occur, and is returned if all of the authentication methods +// provided by the user failed to authenticate. +type ServerAuthError struct { + // Errors contains authentication errors returned by the authentication + // callback methods. + Errors []error +} + +func (l ServerAuthError) Error() string { + var errs []string + for _, err := range l.Errors { + errs = append(errs, err.Error()) + } + return "[" + strings.Join(errs, ", ") + "]" +} + +func (s *connection) serverAuthenticate(config *ServerConfig) (*Permissions, error) { + sessionID := s.transport.getSessionID() + var cache pubKeyCache + var perms *Permissions + + authFailures := 0 + var authErrs []error + +userAuthLoop: + for { + if authFailures >= config.MaxAuthTries && config.MaxAuthTries > 0 { + discMsg := &disconnectMsg{ + Reason: 2, + Message: "too many authentication failures", + } + + if err := s.transport.writePacket(Marshal(discMsg)); err != nil { + return nil, err + } + + return nil, discMsg + } + + var userAuthReq userAuthRequestMsg + if packet, err := s.transport.readPacket(); err != nil { + if err == io.EOF { + return nil, &ServerAuthError{Errors: authErrs} + } + return nil, err + } else if err = Unmarshal(packet, &userAuthReq); err != nil { + return nil, err + } + + if userAuthReq.Service != serviceSSH { + return nil, errors.New("ssh: client attempted to negotiate for unknown service: " + userAuthReq.Service) + } + + s.user = userAuthReq.User + perms = nil + authErr := errors.New("no auth passed yet") + + switch userAuthReq.Method { + case "none": + if config.NoClientAuth { + authErr = nil + } + + // allow initial attempt of 'none' without penalty + if authFailures == 0 { + authFailures-- + } + case "password": + if config.PasswordCallback == nil { + authErr = errors.New("ssh: password auth not configured") + break + } + payload := userAuthReq.Payload + if len(payload) < 1 || payload[0] != 0 { + return nil, parseError(msgUserAuthRequest) + } + payload = payload[1:] + password, payload, ok := parseString(payload) + if !ok || len(payload) > 0 { + return nil, parseError(msgUserAuthRequest) + } + + perms, authErr = config.PasswordCallback(s, password) + case "keyboard-interactive": + if config.KeyboardInteractiveCallback == nil { + authErr = errors.New("ssh: keyboard-interactive auth not configubred") + break + } + + prompter := &sshClientKeyboardInteractive{s} + perms, authErr = config.KeyboardInteractiveCallback(s, prompter.Challenge) + case "publickey": + if config.PublicKeyCallback == nil { + authErr = errors.New("ssh: publickey auth not configured") + break + } + payload := userAuthReq.Payload + if len(payload) < 1 { + return nil, parseError(msgUserAuthRequest) + } + isQuery := payload[0] == 0 + payload = payload[1:] + algoBytes, payload, ok := parseString(payload) + if !ok { + return nil, parseError(msgUserAuthRequest) + } + algo := string(algoBytes) + if !isAcceptableAlgo(algo) { + authErr = fmt.Errorf("ssh: algorithm %q not accepted", algo) + break + } + + pubKeyData, payload, ok := parseString(payload) + if !ok { + return nil, parseError(msgUserAuthRequest) + } + + pubKey, err := ParsePublicKey(pubKeyData) + if err != nil { + return nil, err + } + + candidate, ok := cache.get(s.user, pubKeyData) + if !ok { + candidate.user = s.user + candidate.pubKeyData = pubKeyData + candidate.perms, candidate.result = config.PublicKeyCallback(s, pubKey) + if candidate.result == nil && candidate.perms != nil && candidate.perms.CriticalOptions != nil && candidate.perms.CriticalOptions[sourceAddressCriticalOption] != "" { + candidate.result = checkSourceAddress( + s.RemoteAddr(), + candidate.perms.CriticalOptions[sourceAddressCriticalOption]) + } + cache.add(candidate) + } + + if isQuery { + // The client can query if the given public key + // would be okay. + + if len(payload) > 0 { + return nil, parseError(msgUserAuthRequest) + } + + if candidate.result == nil { + okMsg := userAuthPubKeyOkMsg{ + Algo: algo, + PubKey: pubKeyData, + } + if err = s.transport.writePacket(Marshal(&okMsg)); err != nil { + return nil, err + } + continue userAuthLoop + } + authErr = candidate.result + } else { + sig, payload, ok := parseSignature(payload) + if !ok || len(payload) > 0 { + return nil, parseError(msgUserAuthRequest) + } + // Ensure the public key algo and signature algo + // are supported. Compare the private key + // algorithm name that corresponds to algo with + // sig.Format. This is usually the same, but + // for certs, the names differ. + if !isAcceptableAlgo(sig.Format) { + break + } + signedData := buildDataSignedForAuth(sessionID, userAuthReq, algoBytes, pubKeyData) + + if err := pubKey.Verify(signedData, sig); err != nil { + return nil, err + } + + authErr = candidate.result + perms = candidate.perms + } + default: + authErr = fmt.Errorf("ssh: unknown method %q", userAuthReq.Method) + } + + authErrs = append(authErrs, authErr) + + if config.AuthLogCallback != nil { + config.AuthLogCallback(s, userAuthReq.Method, authErr) + } + + if authErr == nil { + break userAuthLoop + } + + authFailures++ + + var failureMsg userAuthFailureMsg + if config.PasswordCallback != nil { + failureMsg.Methods = append(failureMsg.Methods, "password") + } + if config.PublicKeyCallback != nil { + failureMsg.Methods = append(failureMsg.Methods, "publickey") + } + if config.KeyboardInteractiveCallback != nil { + failureMsg.Methods = append(failureMsg.Methods, "keyboard-interactive") + } + + if len(failureMsg.Methods) == 0 { + return nil, errors.New("ssh: no authentication methods configured but NoClientAuth is also false") + } + + if err := s.transport.writePacket(Marshal(&failureMsg)); err != nil { + return nil, err + } + } + + if err := s.transport.writePacket([]byte{msgUserAuthSuccess}); err != nil { + return nil, err + } + return perms, nil +} + +// sshClientKeyboardInteractive implements a ClientKeyboardInteractive by +// asking the client on the other side of a ServerConn. +type sshClientKeyboardInteractive struct { + *connection +} + +func (c *sshClientKeyboardInteractive) Challenge(user, instruction string, questions []string, echos []bool) (answers []string, err error) { + if len(questions) != len(echos) { + return nil, errors.New("ssh: echos and questions must have equal length") + } + + var prompts []byte + for i := range questions { + prompts = appendString(prompts, questions[i]) + prompts = appendBool(prompts, echos[i]) + } + + if err := c.transport.writePacket(Marshal(&userAuthInfoRequestMsg{ + Instruction: instruction, + NumPrompts: uint32(len(questions)), + Prompts: prompts, + })); err != nil { + return nil, err + } + + packet, err := c.transport.readPacket() + if err != nil { + return nil, err + } + if packet[0] != msgUserAuthInfoResponse { + return nil, unexpectedMessageError(msgUserAuthInfoResponse, packet[0]) + } + packet = packet[1:] + + n, packet, ok := parseUint32(packet) + if !ok || int(n) != len(questions) { + return nil, parseError(msgUserAuthInfoResponse) + } + + for i := uint32(0); i < n; i++ { + ans, rest, ok := parseString(packet) + if !ok { + return nil, parseError(msgUserAuthInfoResponse) + } + + answers = append(answers, string(ans)) + packet = rest + } + if len(packet) != 0 { + return nil, errors.New("ssh: junk at end of message") + } + + return answers, nil +} diff --git a/vendor/golang.org/x/crypto/ssh/session.go b/vendor/golang.org/x/crypto/ssh/session.go new file mode 100644 index 0000000..17e2aa8 --- /dev/null +++ b/vendor/golang.org/x/crypto/ssh/session.go @@ -0,0 +1,627 @@ +// Copyright 2011 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package ssh + +// Session implements an interactive session described in +// "RFC 4254, section 6". + +import ( + "bytes" + "encoding/binary" + "errors" + "fmt" + "io" + "io/ioutil" + "sync" +) + +type Signal string + +// POSIX signals as listed in RFC 4254 Section 6.10. +const ( + SIGABRT Signal = "ABRT" + SIGALRM Signal = "ALRM" + SIGFPE Signal = "FPE" + SIGHUP Signal = "HUP" + SIGILL Signal = "ILL" + SIGINT Signal = "INT" + SIGKILL Signal = "KILL" + SIGPIPE Signal = "PIPE" + SIGQUIT Signal = "QUIT" + SIGSEGV Signal = "SEGV" + SIGTERM Signal = "TERM" + SIGUSR1 Signal = "USR1" + SIGUSR2 Signal = "USR2" +) + +var signals = map[Signal]int{ + SIGABRT: 6, + SIGALRM: 14, + SIGFPE: 8, + SIGHUP: 1, + SIGILL: 4, + SIGINT: 2, + SIGKILL: 9, + SIGPIPE: 13, + SIGQUIT: 3, + SIGSEGV: 11, + SIGTERM: 15, +} + +type TerminalModes map[uint8]uint32 + +// POSIX terminal mode flags as listed in RFC 4254 Section 8. +const ( + tty_OP_END = 0 + VINTR = 1 + VQUIT = 2 + VERASE = 3 + VKILL = 4 + VEOF = 5 + VEOL = 6 + VEOL2 = 7 + VSTART = 8 + VSTOP = 9 + VSUSP = 10 + VDSUSP = 11 + VREPRINT = 12 + VWERASE = 13 + VLNEXT = 14 + VFLUSH = 15 + VSWTCH = 16 + VSTATUS = 17 + VDISCARD = 18 + IGNPAR = 30 + PARMRK = 31 + INPCK = 32 + ISTRIP = 33 + INLCR = 34 + IGNCR = 35 + ICRNL = 36 + IUCLC = 37 + IXON = 38 + IXANY = 39 + IXOFF = 40 + IMAXBEL = 41 + ISIG = 50 + ICANON = 51 + XCASE = 52 + ECHO = 53 + ECHOE = 54 + ECHOK = 55 + ECHONL = 56 + NOFLSH = 57 + TOSTOP = 58 + IEXTEN = 59 + ECHOCTL = 60 + ECHOKE = 61 + PENDIN = 62 + OPOST = 70 + OLCUC = 71 + ONLCR = 72 + OCRNL = 73 + ONOCR = 74 + ONLRET = 75 + CS7 = 90 + CS8 = 91 + PARENB = 92 + PARODD = 93 + TTY_OP_ISPEED = 128 + TTY_OP_OSPEED = 129 +) + +// A Session represents a connection to a remote command or shell. +type Session struct { + // Stdin specifies the remote process's standard input. + // If Stdin is nil, the remote process reads from an empty + // bytes.Buffer. + Stdin io.Reader + + // Stdout and Stderr specify the remote process's standard + // output and error. + // + // If either is nil, Run connects the corresponding file + // descriptor to an instance of ioutil.Discard. There is a + // fixed amount of buffering that is shared for the two streams. + // If either blocks it may eventually cause the remote + // command to block. + Stdout io.Writer + Stderr io.Writer + + ch Channel // the channel backing this session + started bool // true once Start, Run or Shell is invoked. + copyFuncs []func() error + errors chan error // one send per copyFunc + + // true if pipe method is active + stdinpipe, stdoutpipe, stderrpipe bool + + // stdinPipeWriter is non-nil if StdinPipe has not been called + // and Stdin was specified by the user; it is the write end of + // a pipe connecting Session.Stdin to the stdin channel. + stdinPipeWriter io.WriteCloser + + exitStatus chan error +} + +// SendRequest sends an out-of-band channel request on the SSH channel +// underlying the session. +func (s *Session) SendRequest(name string, wantReply bool, payload []byte) (bool, error) { + return s.ch.SendRequest(name, wantReply, payload) +} + +func (s *Session) Close() error { + return s.ch.Close() +} + +// RFC 4254 Section 6.4. +type setenvRequest struct { + Name string + Value string +} + +// Setenv sets an environment variable that will be applied to any +// command executed by Shell or Run. +func (s *Session) Setenv(name, value string) error { + msg := setenvRequest{ + Name: name, + Value: value, + } + ok, err := s.ch.SendRequest("env", true, Marshal(&msg)) + if err == nil && !ok { + err = errors.New("ssh: setenv failed") + } + return err +} + +// RFC 4254 Section 6.2. +type ptyRequestMsg struct { + Term string + Columns uint32 + Rows uint32 + Width uint32 + Height uint32 + Modelist string +} + +// RequestPty requests the association of a pty with the session on the remote host. +func (s *Session) RequestPty(term string, h, w int, termmodes TerminalModes) error { + var tm []byte + for k, v := range termmodes { + kv := struct { + Key byte + Val uint32 + }{k, v} + + tm = append(tm, Marshal(&kv)...) + } + tm = append(tm, tty_OP_END) + req := ptyRequestMsg{ + Term: term, + Columns: uint32(w), + Rows: uint32(h), + Width: uint32(w * 8), + Height: uint32(h * 8), + Modelist: string(tm), + } + ok, err := s.ch.SendRequest("pty-req", true, Marshal(&req)) + if err == nil && !ok { + err = errors.New("ssh: pty-req failed") + } + return err +} + +// RFC 4254 Section 6.5. +type subsystemRequestMsg struct { + Subsystem string +} + +// RequestSubsystem requests the association of a subsystem with the session on the remote host. +// A subsystem is a predefined command that runs in the background when the ssh session is initiated +func (s *Session) RequestSubsystem(subsystem string) error { + msg := subsystemRequestMsg{ + Subsystem: subsystem, + } + ok, err := s.ch.SendRequest("subsystem", true, Marshal(&msg)) + if err == nil && !ok { + err = errors.New("ssh: subsystem request failed") + } + return err +} + +// RFC 4254 Section 6.9. +type signalMsg struct { + Signal string +} + +// Signal sends the given signal to the remote process. +// sig is one of the SIG* constants. +func (s *Session) Signal(sig Signal) error { + msg := signalMsg{ + Signal: string(sig), + } + + _, err := s.ch.SendRequest("signal", false, Marshal(&msg)) + return err +} + +// RFC 4254 Section 6.5. +type execMsg struct { + Command string +} + +// Start runs cmd on the remote host. Typically, the remote +// server passes cmd to the shell for interpretation. +// A Session only accepts one call to Run, Start or Shell. +func (s *Session) Start(cmd string) error { + if s.started { + return errors.New("ssh: session already started") + } + req := execMsg{ + Command: cmd, + } + + ok, err := s.ch.SendRequest("exec", true, Marshal(&req)) + if err == nil && !ok { + err = fmt.Errorf("ssh: command %v failed", cmd) + } + if err != nil { + return err + } + return s.start() +} + +// Run runs cmd on the remote host. Typically, the remote +// server passes cmd to the shell for interpretation. +// A Session only accepts one call to Run, Start, Shell, Output, +// or CombinedOutput. +// +// The returned error is nil if the command runs, has no problems +// copying stdin, stdout, and stderr, and exits with a zero exit +// status. +// +// If the remote server does not send an exit status, an error of type +// *ExitMissingError is returned. If the command completes +// unsuccessfully or is interrupted by a signal, the error is of type +// *ExitError. Other error types may be returned for I/O problems. +func (s *Session) Run(cmd string) error { + err := s.Start(cmd) + if err != nil { + return err + } + return s.Wait() +} + +// Output runs cmd on the remote host and returns its standard output. +func (s *Session) Output(cmd string) ([]byte, error) { + if s.Stdout != nil { + return nil, errors.New("ssh: Stdout already set") + } + var b bytes.Buffer + s.Stdout = &b + err := s.Run(cmd) + return b.Bytes(), err +} + +type singleWriter struct { + b bytes.Buffer + mu sync.Mutex +} + +func (w *singleWriter) Write(p []byte) (int, error) { + w.mu.Lock() + defer w.mu.Unlock() + return w.b.Write(p) +} + +// CombinedOutput runs cmd on the remote host and returns its combined +// standard output and standard error. +func (s *Session) CombinedOutput(cmd string) ([]byte, error) { + if s.Stdout != nil { + return nil, errors.New("ssh: Stdout already set") + } + if s.Stderr != nil { + return nil, errors.New("ssh: Stderr already set") + } + var b singleWriter + s.Stdout = &b + s.Stderr = &b + err := s.Run(cmd) + return b.b.Bytes(), err +} + +// Shell starts a login shell on the remote host. A Session only +// accepts one call to Run, Start, Shell, Output, or CombinedOutput. +func (s *Session) Shell() error { + if s.started { + return errors.New("ssh: session already started") + } + + ok, err := s.ch.SendRequest("shell", true, nil) + if err == nil && !ok { + return errors.New("ssh: could not start shell") + } + if err != nil { + return err + } + return s.start() +} + +func (s *Session) start() error { + s.started = true + + type F func(*Session) + for _, setupFd := range []F{(*Session).stdin, (*Session).stdout, (*Session).stderr} { + setupFd(s) + } + + s.errors = make(chan error, len(s.copyFuncs)) + for _, fn := range s.copyFuncs { + go func(fn func() error) { + s.errors <- fn() + }(fn) + } + return nil +} + +// Wait waits for the remote command to exit. +// +// The returned error is nil if the command runs, has no problems +// copying stdin, stdout, and stderr, and exits with a zero exit +// status. +// +// If the remote server does not send an exit status, an error of type +// *ExitMissingError is returned. If the command completes +// unsuccessfully or is interrupted by a signal, the error is of type +// *ExitError. Other error types may be returned for I/O problems. +func (s *Session) Wait() error { + if !s.started { + return errors.New("ssh: session not started") + } + waitErr := <-s.exitStatus + + if s.stdinPipeWriter != nil { + s.stdinPipeWriter.Close() + } + var copyError error + for _ = range s.copyFuncs { + if err := <-s.errors; err != nil && copyError == nil { + copyError = err + } + } + if waitErr != nil { + return waitErr + } + return copyError +} + +func (s *Session) wait(reqs <-chan *Request) error { + wm := Waitmsg{status: -1} + // Wait for msg channel to be closed before returning. + for msg := range reqs { + switch msg.Type { + case "exit-status": + wm.status = int(binary.BigEndian.Uint32(msg.Payload)) + case "exit-signal": + var sigval struct { + Signal string + CoreDumped bool + Error string + Lang string + } + if err := Unmarshal(msg.Payload, &sigval); err != nil { + return err + } + + // Must sanitize strings? + wm.signal = sigval.Signal + wm.msg = sigval.Error + wm.lang = sigval.Lang + default: + // This handles keepalives and matches + // OpenSSH's behaviour. + if msg.WantReply { + msg.Reply(false, nil) + } + } + } + if wm.status == 0 { + return nil + } + if wm.status == -1 { + // exit-status was never sent from server + if wm.signal == "" { + // signal was not sent either. RFC 4254 + // section 6.10 recommends against this + // behavior, but it is allowed, so we let + // clients handle it. + return &ExitMissingError{} + } + wm.status = 128 + if _, ok := signals[Signal(wm.signal)]; ok { + wm.status += signals[Signal(wm.signal)] + } + } + + return &ExitError{wm} +} + +// ExitMissingError is returned if a session is torn down cleanly, but +// the server sends no confirmation of the exit status. +type ExitMissingError struct{} + +func (e *ExitMissingError) Error() string { + return "wait: remote command exited without exit status or exit signal" +} + +func (s *Session) stdin() { + if s.stdinpipe { + return + } + var stdin io.Reader + if s.Stdin == nil { + stdin = new(bytes.Buffer) + } else { + r, w := io.Pipe() + go func() { + _, err := io.Copy(w, s.Stdin) + w.CloseWithError(err) + }() + stdin, s.stdinPipeWriter = r, w + } + s.copyFuncs = append(s.copyFuncs, func() error { + _, err := io.Copy(s.ch, stdin) + if err1 := s.ch.CloseWrite(); err == nil && err1 != io.EOF { + err = err1 + } + return err + }) +} + +func (s *Session) stdout() { + if s.stdoutpipe { + return + } + if s.Stdout == nil { + s.Stdout = ioutil.Discard + } + s.copyFuncs = append(s.copyFuncs, func() error { + _, err := io.Copy(s.Stdout, s.ch) + return err + }) +} + +func (s *Session) stderr() { + if s.stderrpipe { + return + } + if s.Stderr == nil { + s.Stderr = ioutil.Discard + } + s.copyFuncs = append(s.copyFuncs, func() error { + _, err := io.Copy(s.Stderr, s.ch.Stderr()) + return err + }) +} + +// sessionStdin reroutes Close to CloseWrite. +type sessionStdin struct { + io.Writer + ch Channel +} + +func (s *sessionStdin) Close() error { + return s.ch.CloseWrite() +} + +// StdinPipe returns a pipe that will be connected to the +// remote command's standard input when the command starts. +func (s *Session) StdinPipe() (io.WriteCloser, error) { + if s.Stdin != nil { + return nil, errors.New("ssh: Stdin already set") + } + if s.started { + return nil, errors.New("ssh: StdinPipe after process started") + } + s.stdinpipe = true + return &sessionStdin{s.ch, s.ch}, nil +} + +// StdoutPipe returns a pipe that will be connected to the +// remote command's standard output when the command starts. +// There is a fixed amount of buffering that is shared between +// stdout and stderr streams. If the StdoutPipe reader is +// not serviced fast enough it may eventually cause the +// remote command to block. +func (s *Session) StdoutPipe() (io.Reader, error) { + if s.Stdout != nil { + return nil, errors.New("ssh: Stdout already set") + } + if s.started { + return nil, errors.New("ssh: StdoutPipe after process started") + } + s.stdoutpipe = true + return s.ch, nil +} + +// StderrPipe returns a pipe that will be connected to the +// remote command's standard error when the command starts. +// There is a fixed amount of buffering that is shared between +// stdout and stderr streams. If the StderrPipe reader is +// not serviced fast enough it may eventually cause the +// remote command to block. +func (s *Session) StderrPipe() (io.Reader, error) { + if s.Stderr != nil { + return nil, errors.New("ssh: Stderr already set") + } + if s.started { + return nil, errors.New("ssh: StderrPipe after process started") + } + s.stderrpipe = true + return s.ch.Stderr(), nil +} + +// newSession returns a new interactive session on the remote host. +func newSession(ch Channel, reqs <-chan *Request) (*Session, error) { + s := &Session{ + ch: ch, + } + s.exitStatus = make(chan error, 1) + go func() { + s.exitStatus <- s.wait(reqs) + }() + + return s, nil +} + +// An ExitError reports unsuccessful completion of a remote command. +type ExitError struct { + Waitmsg +} + +func (e *ExitError) Error() string { + return e.Waitmsg.String() +} + +// Waitmsg stores the information about an exited remote command +// as reported by Wait. +type Waitmsg struct { + status int + signal string + msg string + lang string +} + +// ExitStatus returns the exit status of the remote command. +func (w Waitmsg) ExitStatus() int { + return w.status +} + +// Signal returns the exit signal of the remote command if +// it was terminated violently. +func (w Waitmsg) Signal() string { + return w.signal +} + +// Msg returns the exit message given by the remote command +func (w Waitmsg) Msg() string { + return w.msg +} + +// Lang returns the language tag. See RFC 3066 +func (w Waitmsg) Lang() string { + return w.lang +} + +func (w Waitmsg) String() string { + str := fmt.Sprintf("Process exited with status %v", w.status) + if w.signal != "" { + str += fmt.Sprintf(" from signal %v", w.signal) + } + if w.msg != "" { + str += fmt.Sprintf(". Reason was: %v", w.msg) + } + return str +} diff --git a/vendor/golang.org/x/crypto/ssh/session_test.go b/vendor/golang.org/x/crypto/ssh/session_test.go new file mode 100644 index 0000000..7dce6dd --- /dev/null +++ b/vendor/golang.org/x/crypto/ssh/session_test.go @@ -0,0 +1,774 @@ +// Copyright 2011 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package ssh + +// Session tests. + +import ( + "bytes" + crypto_rand "crypto/rand" + "errors" + "io" + "io/ioutil" + "math/rand" + "net" + "testing" + + "golang.org/x/crypto/ssh/terminal" +) + +type serverType func(Channel, <-chan *Request, *testing.T) + +// dial constructs a new test server and returns a *ClientConn. +func dial(handler serverType, t *testing.T) *Client { + c1, c2, err := netPipe() + if err != nil { + t.Fatalf("netPipe: %v", err) + } + + go func() { + defer c1.Close() + conf := ServerConfig{ + NoClientAuth: true, + } + conf.AddHostKey(testSigners["rsa"]) + + _, chans, reqs, err := NewServerConn(c1, &conf) + if err != nil { + t.Fatalf("Unable to handshake: %v", err) + } + go DiscardRequests(reqs) + + for newCh := range chans { + if newCh.ChannelType() != "session" { + newCh.Reject(UnknownChannelType, "unknown channel type") + continue + } + + ch, inReqs, err := newCh.Accept() + if err != nil { + t.Errorf("Accept: %v", err) + continue + } + go func() { + handler(ch, inReqs, t) + }() + } + }() + + config := &ClientConfig{ + User: "testuser", + HostKeyCallback: InsecureIgnoreHostKey(), + } + + conn, chans, reqs, err := NewClientConn(c2, "", config) + if err != nil { + t.Fatalf("unable to dial remote side: %v", err) + } + + return NewClient(conn, chans, reqs) +} + +// Test a simple string is returned to session.Stdout. +func TestSessionShell(t *testing.T) { + conn := dial(shellHandler, t) + defer conn.Close() + session, err := conn.NewSession() + if err != nil { + t.Fatalf("Unable to request new session: %v", err) + } + defer session.Close() + stdout := new(bytes.Buffer) + session.Stdout = stdout + if err := session.Shell(); err != nil { + t.Fatalf("Unable to execute command: %s", err) + } + if err := session.Wait(); err != nil { + t.Fatalf("Remote command did not exit cleanly: %v", err) + } + actual := stdout.String() + if actual != "golang" { + t.Fatalf("Remote shell did not return expected string: expected=golang, actual=%s", actual) + } +} + +// TODO(dfc) add support for Std{in,err}Pipe when the Server supports it. + +// Test a simple string is returned via StdoutPipe. +func TestSessionStdoutPipe(t *testing.T) { + conn := dial(shellHandler, t) + defer conn.Close() + session, err := conn.NewSession() + if err != nil { + t.Fatalf("Unable to request new session: %v", err) + } + defer session.Close() + stdout, err := session.StdoutPipe() + if err != nil { + t.Fatalf("Unable to request StdoutPipe(): %v", err) + } + var buf bytes.Buffer + if err := session.Shell(); err != nil { + t.Fatalf("Unable to execute command: %v", err) + } + done := make(chan bool, 1) + go func() { + if _, err := io.Copy(&buf, stdout); err != nil { + t.Errorf("Copy of stdout failed: %v", err) + } + done <- true + }() + if err := session.Wait(); err != nil { + t.Fatalf("Remote command did not exit cleanly: %v", err) + } + <-done + actual := buf.String() + if actual != "golang" { + t.Fatalf("Remote shell did not return expected string: expected=golang, actual=%s", actual) + } +} + +// Test that a simple string is returned via the Output helper, +// and that stderr is discarded. +func TestSessionOutput(t *testing.T) { + conn := dial(fixedOutputHandler, t) + defer conn.Close() + session, err := conn.NewSession() + if err != nil { + t.Fatalf("Unable to request new session: %v", err) + } + defer session.Close() + + buf, err := session.Output("") // cmd is ignored by fixedOutputHandler + if err != nil { + t.Error("Remote command did not exit cleanly:", err) + } + w := "this-is-stdout." + g := string(buf) + if g != w { + t.Error("Remote command did not return expected string:") + t.Logf("want %q", w) + t.Logf("got %q", g) + } +} + +// Test that both stdout and stderr are returned +// via the CombinedOutput helper. +func TestSessionCombinedOutput(t *testing.T) { + conn := dial(fixedOutputHandler, t) + defer conn.Close() + session, err := conn.NewSession() + if err != nil { + t.Fatalf("Unable to request new session: %v", err) + } + defer session.Close() + + buf, err := session.CombinedOutput("") // cmd is ignored by fixedOutputHandler + if err != nil { + t.Error("Remote command did not exit cleanly:", err) + } + const stdout = "this-is-stdout." + const stderr = "this-is-stderr." + g := string(buf) + if g != stdout+stderr && g != stderr+stdout { + t.Error("Remote command did not return expected string:") + t.Logf("want %q, or %q", stdout+stderr, stderr+stdout) + t.Logf("got %q", g) + } +} + +// Test non-0 exit status is returned correctly. +func TestExitStatusNonZero(t *testing.T) { + conn := dial(exitStatusNonZeroHandler, t) + defer conn.Close() + session, err := conn.NewSession() + if err != nil { + t.Fatalf("Unable to request new session: %v", err) + } + defer session.Close() + if err := session.Shell(); err != nil { + t.Fatalf("Unable to execute command: %v", err) + } + err = session.Wait() + if err == nil { + t.Fatalf("expected command to fail but it didn't") + } + e, ok := err.(*ExitError) + if !ok { + t.Fatalf("expected *ExitError but got %T", err) + } + if e.ExitStatus() != 15 { + t.Fatalf("expected command to exit with 15 but got %v", e.ExitStatus()) + } +} + +// Test 0 exit status is returned correctly. +func TestExitStatusZero(t *testing.T) { + conn := dial(exitStatusZeroHandler, t) + defer conn.Close() + session, err := conn.NewSession() + if err != nil { + t.Fatalf("Unable to request new session: %v", err) + } + defer session.Close() + + if err := session.Shell(); err != nil { + t.Fatalf("Unable to execute command: %v", err) + } + err = session.Wait() + if err != nil { + t.Fatalf("expected nil but got %v", err) + } +} + +// Test exit signal and status are both returned correctly. +func TestExitSignalAndStatus(t *testing.T) { + conn := dial(exitSignalAndStatusHandler, t) + defer conn.Close() + session, err := conn.NewSession() + if err != nil { + t.Fatalf("Unable to request new session: %v", err) + } + defer session.Close() + if err := session.Shell(); err != nil { + t.Fatalf("Unable to execute command: %v", err) + } + err = session.Wait() + if err == nil { + t.Fatalf("expected command to fail but it didn't") + } + e, ok := err.(*ExitError) + if !ok { + t.Fatalf("expected *ExitError but got %T", err) + } + if e.Signal() != "TERM" || e.ExitStatus() != 15 { + t.Fatalf("expected command to exit with signal TERM and status 15 but got signal %s and status %v", e.Signal(), e.ExitStatus()) + } +} + +// Test exit signal and status are both returned correctly. +func TestKnownExitSignalOnly(t *testing.T) { + conn := dial(exitSignalHandler, t) + defer conn.Close() + session, err := conn.NewSession() + if err != nil { + t.Fatalf("Unable to request new session: %v", err) + } + defer session.Close() + if err := session.Shell(); err != nil { + t.Fatalf("Unable to execute command: %v", err) + } + err = session.Wait() + if err == nil { + t.Fatalf("expected command to fail but it didn't") + } + e, ok := err.(*ExitError) + if !ok { + t.Fatalf("expected *ExitError but got %T", err) + } + if e.Signal() != "TERM" || e.ExitStatus() != 143 { + t.Fatalf("expected command to exit with signal TERM and status 143 but got signal %s and status %v", e.Signal(), e.ExitStatus()) + } +} + +// Test exit signal and status are both returned correctly. +func TestUnknownExitSignal(t *testing.T) { + conn := dial(exitSignalUnknownHandler, t) + defer conn.Close() + session, err := conn.NewSession() + if err != nil { + t.Fatalf("Unable to request new session: %v", err) + } + defer session.Close() + if err := session.Shell(); err != nil { + t.Fatalf("Unable to execute command: %v", err) + } + err = session.Wait() + if err == nil { + t.Fatalf("expected command to fail but it didn't") + } + e, ok := err.(*ExitError) + if !ok { + t.Fatalf("expected *ExitError but got %T", err) + } + if e.Signal() != "SYS" || e.ExitStatus() != 128 { + t.Fatalf("expected command to exit with signal SYS and status 128 but got signal %s and status %v", e.Signal(), e.ExitStatus()) + } +} + +func TestExitWithoutStatusOrSignal(t *testing.T) { + conn := dial(exitWithoutSignalOrStatus, t) + defer conn.Close() + session, err := conn.NewSession() + if err != nil { + t.Fatalf("Unable to request new session: %v", err) + } + defer session.Close() + if err := session.Shell(); err != nil { + t.Fatalf("Unable to execute command: %v", err) + } + err = session.Wait() + if err == nil { + t.Fatalf("expected command to fail but it didn't") + } + if _, ok := err.(*ExitMissingError); !ok { + t.Fatalf("got %T want *ExitMissingError", err) + } +} + +// windowTestBytes is the number of bytes that we'll send to the SSH server. +const windowTestBytes = 16000 * 200 + +// TestServerWindow writes random data to the server. The server is expected to echo +// the same data back, which is compared against the original. +func TestServerWindow(t *testing.T) { + origBuf := bytes.NewBuffer(make([]byte, 0, windowTestBytes)) + io.CopyN(origBuf, crypto_rand.Reader, windowTestBytes) + origBytes := origBuf.Bytes() + + conn := dial(echoHandler, t) + defer conn.Close() + session, err := conn.NewSession() + if err != nil { + t.Fatal(err) + } + defer session.Close() + result := make(chan []byte) + + go func() { + defer close(result) + echoedBuf := bytes.NewBuffer(make([]byte, 0, windowTestBytes)) + serverStdout, err := session.StdoutPipe() + if err != nil { + t.Errorf("StdoutPipe failed: %v", err) + return + } + n, err := copyNRandomly("stdout", echoedBuf, serverStdout, windowTestBytes) + if err != nil && err != io.EOF { + t.Errorf("Read only %d bytes from server, expected %d: %v", n, windowTestBytes, err) + } + result <- echoedBuf.Bytes() + }() + + serverStdin, err := session.StdinPipe() + if err != nil { + t.Fatalf("StdinPipe failed: %v", err) + } + written, err := copyNRandomly("stdin", serverStdin, origBuf, windowTestBytes) + if err != nil { + t.Fatalf("failed to copy origBuf to serverStdin: %v", err) + } + if written != windowTestBytes { + t.Fatalf("Wrote only %d of %d bytes to server", written, windowTestBytes) + } + + echoedBytes := <-result + + if !bytes.Equal(origBytes, echoedBytes) { + t.Fatalf("Echoed buffer differed from original, orig %d, echoed %d", len(origBytes), len(echoedBytes)) + } +} + +// Verify the client can handle a keepalive packet from the server. +func TestClientHandlesKeepalives(t *testing.T) { + conn := dial(channelKeepaliveSender, t) + defer conn.Close() + session, err := conn.NewSession() + if err != nil { + t.Fatal(err) + } + defer session.Close() + if err := session.Shell(); err != nil { + t.Fatalf("Unable to execute command: %v", err) + } + err = session.Wait() + if err != nil { + t.Fatalf("expected nil but got: %v", err) + } +} + +type exitStatusMsg struct { + Status uint32 +} + +type exitSignalMsg struct { + Signal string + CoreDumped bool + Errmsg string + Lang string +} + +func handleTerminalRequests(in <-chan *Request) { + for req := range in { + ok := false + switch req.Type { + case "shell": + ok = true + if len(req.Payload) > 0 { + // We don't accept any commands, only the default shell. + ok = false + } + case "env": + ok = true + } + req.Reply(ok, nil) + } +} + +func newServerShell(ch Channel, in <-chan *Request, prompt string) *terminal.Terminal { + term := terminal.NewTerminal(ch, prompt) + go handleTerminalRequests(in) + return term +} + +func exitStatusZeroHandler(ch Channel, in <-chan *Request, t *testing.T) { + defer ch.Close() + // this string is returned to stdout + shell := newServerShell(ch, in, "> ") + readLine(shell, t) + sendStatus(0, ch, t) +} + +func exitStatusNonZeroHandler(ch Channel, in <-chan *Request, t *testing.T) { + defer ch.Close() + shell := newServerShell(ch, in, "> ") + readLine(shell, t) + sendStatus(15, ch, t) +} + +func exitSignalAndStatusHandler(ch Channel, in <-chan *Request, t *testing.T) { + defer ch.Close() + shell := newServerShell(ch, in, "> ") + readLine(shell, t) + sendStatus(15, ch, t) + sendSignal("TERM", ch, t) +} + +func exitSignalHandler(ch Channel, in <-chan *Request, t *testing.T) { + defer ch.Close() + shell := newServerShell(ch, in, "> ") + readLine(shell, t) + sendSignal("TERM", ch, t) +} + +func exitSignalUnknownHandler(ch Channel, in <-chan *Request, t *testing.T) { + defer ch.Close() + shell := newServerShell(ch, in, "> ") + readLine(shell, t) + sendSignal("SYS", ch, t) +} + +func exitWithoutSignalOrStatus(ch Channel, in <-chan *Request, t *testing.T) { + defer ch.Close() + shell := newServerShell(ch, in, "> ") + readLine(shell, t) +} + +func shellHandler(ch Channel, in <-chan *Request, t *testing.T) { + defer ch.Close() + // this string is returned to stdout + shell := newServerShell(ch, in, "golang") + readLine(shell, t) + sendStatus(0, ch, t) +} + +// Ignores the command, writes fixed strings to stderr and stdout. +// Strings are "this-is-stdout." and "this-is-stderr.". +func fixedOutputHandler(ch Channel, in <-chan *Request, t *testing.T) { + defer ch.Close() + _, err := ch.Read(nil) + + req, ok := <-in + if !ok { + t.Fatalf("error: expected channel request, got: %#v", err) + return + } + + // ignore request, always send some text + req.Reply(true, nil) + + _, err = io.WriteString(ch, "this-is-stdout.") + if err != nil { + t.Fatalf("error writing on server: %v", err) + } + _, err = io.WriteString(ch.Stderr(), "this-is-stderr.") + if err != nil { + t.Fatalf("error writing on server: %v", err) + } + sendStatus(0, ch, t) +} + +func readLine(shell *terminal.Terminal, t *testing.T) { + if _, err := shell.ReadLine(); err != nil && err != io.EOF { + t.Errorf("unable to read line: %v", err) + } +} + +func sendStatus(status uint32, ch Channel, t *testing.T) { + msg := exitStatusMsg{ + Status: status, + } + if _, err := ch.SendRequest("exit-status", false, Marshal(&msg)); err != nil { + t.Errorf("unable to send status: %v", err) + } +} + +func sendSignal(signal string, ch Channel, t *testing.T) { + sig := exitSignalMsg{ + Signal: signal, + CoreDumped: false, + Errmsg: "Process terminated", + Lang: "en-GB-oed", + } + if _, err := ch.SendRequest("exit-signal", false, Marshal(&sig)); err != nil { + t.Errorf("unable to send signal: %v", err) + } +} + +func discardHandler(ch Channel, t *testing.T) { + defer ch.Close() + io.Copy(ioutil.Discard, ch) +} + +func echoHandler(ch Channel, in <-chan *Request, t *testing.T) { + defer ch.Close() + if n, err := copyNRandomly("echohandler", ch, ch, windowTestBytes); err != nil { + t.Errorf("short write, wrote %d, expected %d: %v ", n, windowTestBytes, err) + } +} + +// copyNRandomly copies n bytes from src to dst. It uses a variable, and random, +// buffer size to exercise more code paths. +func copyNRandomly(title string, dst io.Writer, src io.Reader, n int) (int, error) { + var ( + buf = make([]byte, 32*1024) + written int + remaining = n + ) + for remaining > 0 { + l := rand.Intn(1 << 15) + if remaining < l { + l = remaining + } + nr, er := src.Read(buf[:l]) + nw, ew := dst.Write(buf[:nr]) + remaining -= nw + written += nw + if ew != nil { + return written, ew + } + if nr != nw { + return written, io.ErrShortWrite + } + if er != nil && er != io.EOF { + return written, er + } + } + return written, nil +} + +func channelKeepaliveSender(ch Channel, in <-chan *Request, t *testing.T) { + defer ch.Close() + shell := newServerShell(ch, in, "> ") + readLine(shell, t) + if _, err := ch.SendRequest("keepalive@openssh.com", true, nil); err != nil { + t.Errorf("unable to send channel keepalive request: %v", err) + } + sendStatus(0, ch, t) +} + +func TestClientWriteEOF(t *testing.T) { + conn := dial(simpleEchoHandler, t) + defer conn.Close() + + session, err := conn.NewSession() + if err != nil { + t.Fatal(err) + } + defer session.Close() + stdin, err := session.StdinPipe() + if err != nil { + t.Fatalf("StdinPipe failed: %v", err) + } + stdout, err := session.StdoutPipe() + if err != nil { + t.Fatalf("StdoutPipe failed: %v", err) + } + + data := []byte(`0000`) + _, err = stdin.Write(data) + if err != nil { + t.Fatalf("Write failed: %v", err) + } + stdin.Close() + + res, err := ioutil.ReadAll(stdout) + if err != nil { + t.Fatalf("Read failed: %v", err) + } + + if !bytes.Equal(data, res) { + t.Fatalf("Read differed from write, wrote: %v, read: %v", data, res) + } +} + +func simpleEchoHandler(ch Channel, in <-chan *Request, t *testing.T) { + defer ch.Close() + data, err := ioutil.ReadAll(ch) + if err != nil { + t.Errorf("handler read error: %v", err) + } + _, err = ch.Write(data) + if err != nil { + t.Errorf("handler write error: %v", err) + } +} + +func TestSessionID(t *testing.T) { + c1, c2, err := netPipe() + if err != nil { + t.Fatalf("netPipe: %v", err) + } + defer c1.Close() + defer c2.Close() + + serverID := make(chan []byte, 1) + clientID := make(chan []byte, 1) + + serverConf := &ServerConfig{ + NoClientAuth: true, + } + serverConf.AddHostKey(testSigners["ecdsa"]) + clientConf := &ClientConfig{ + HostKeyCallback: InsecureIgnoreHostKey(), + User: "user", + } + + go func() { + conn, chans, reqs, err := NewServerConn(c1, serverConf) + if err != nil { + t.Fatalf("server handshake: %v", err) + } + serverID <- conn.SessionID() + go DiscardRequests(reqs) + for ch := range chans { + ch.Reject(Prohibited, "") + } + }() + + go func() { + conn, chans, reqs, err := NewClientConn(c2, "", clientConf) + if err != nil { + t.Fatalf("client handshake: %v", err) + } + clientID <- conn.SessionID() + go DiscardRequests(reqs) + for ch := range chans { + ch.Reject(Prohibited, "") + } + }() + + s := <-serverID + c := <-clientID + if bytes.Compare(s, c) != 0 { + t.Errorf("server session ID (%x) != client session ID (%x)", s, c) + } else if len(s) == 0 { + t.Errorf("client and server SessionID were empty.") + } +} + +type noReadConn struct { + readSeen bool + net.Conn +} + +func (c *noReadConn) Close() error { + return nil +} + +func (c *noReadConn) Read(b []byte) (int, error) { + c.readSeen = true + return 0, errors.New("noReadConn error") +} + +func TestInvalidServerConfiguration(t *testing.T) { + c1, c2, err := netPipe() + if err != nil { + t.Fatalf("netPipe: %v", err) + } + defer c1.Close() + defer c2.Close() + + serveConn := noReadConn{Conn: c1} + serverConf := &ServerConfig{} + + NewServerConn(&serveConn, serverConf) + if serveConn.readSeen { + t.Fatalf("NewServerConn attempted to Read() from Conn while configuration is missing host key") + } + + serverConf.AddHostKey(testSigners["ecdsa"]) + + NewServerConn(&serveConn, serverConf) + if serveConn.readSeen { + t.Fatalf("NewServerConn attempted to Read() from Conn while configuration is missing authentication method") + } +} + +func TestHostKeyAlgorithms(t *testing.T) { + serverConf := &ServerConfig{ + NoClientAuth: true, + } + serverConf.AddHostKey(testSigners["rsa"]) + serverConf.AddHostKey(testSigners["ecdsa"]) + + connect := func(clientConf *ClientConfig, want string) { + var alg string + clientConf.HostKeyCallback = func(h string, a net.Addr, key PublicKey) error { + alg = key.Type() + return nil + } + c1, c2, err := netPipe() + if err != nil { + t.Fatalf("netPipe: %v", err) + } + defer c1.Close() + defer c2.Close() + + go NewServerConn(c1, serverConf) + _, _, _, err = NewClientConn(c2, "", clientConf) + if err != nil { + t.Fatalf("NewClientConn: %v", err) + } + if alg != want { + t.Errorf("selected key algorithm %s, want %s", alg, want) + } + } + + // By default, we get the preferred algorithm, which is ECDSA 256. + + clientConf := &ClientConfig{ + HostKeyCallback: InsecureIgnoreHostKey(), + } + connect(clientConf, KeyAlgoECDSA256) + + // Client asks for RSA explicitly. + clientConf.HostKeyAlgorithms = []string{KeyAlgoRSA} + connect(clientConf, KeyAlgoRSA) + + c1, c2, err := netPipe() + if err != nil { + t.Fatalf("netPipe: %v", err) + } + defer c1.Close() + defer c2.Close() + + go NewServerConn(c1, serverConf) + clientConf.HostKeyAlgorithms = []string{"nonexistent-hostkey-algo"} + _, _, _, err = NewClientConn(c2, "", clientConf) + if err == nil { + t.Fatal("succeeded connecting with unknown hostkey algorithm") + } +} diff --git a/vendor/golang.org/x/crypto/ssh/streamlocal.go b/vendor/golang.org/x/crypto/ssh/streamlocal.go new file mode 100644 index 0000000..a2dccc6 --- /dev/null +++ b/vendor/golang.org/x/crypto/ssh/streamlocal.go @@ -0,0 +1,115 @@ +package ssh + +import ( + "errors" + "io" + "net" +) + +// streamLocalChannelOpenDirectMsg is a struct used for SSH_MSG_CHANNEL_OPEN message +// with "direct-streamlocal@openssh.com" string. +// +// See openssh-portable/PROTOCOL, section 2.4. connection: Unix domain socket forwarding +// https://github.com/openssh/openssh-portable/blob/master/PROTOCOL#L235 +type streamLocalChannelOpenDirectMsg struct { + socketPath string + reserved0 string + reserved1 uint32 +} + +// forwardedStreamLocalPayload is a struct used for SSH_MSG_CHANNEL_OPEN message +// with "forwarded-streamlocal@openssh.com" string. +type forwardedStreamLocalPayload struct { + SocketPath string + Reserved0 string +} + +// streamLocalChannelForwardMsg is a struct used for SSH2_MSG_GLOBAL_REQUEST message +// with "streamlocal-forward@openssh.com"/"cancel-streamlocal-forward@openssh.com" string. +type streamLocalChannelForwardMsg struct { + socketPath string +} + +// ListenUnix is similar to ListenTCP but uses a Unix domain socket. +func (c *Client) ListenUnix(socketPath string) (net.Listener, error) { + m := streamLocalChannelForwardMsg{ + socketPath, + } + // send message + ok, _, err := c.SendRequest("streamlocal-forward@openssh.com", true, Marshal(&m)) + if err != nil { + return nil, err + } + if !ok { + return nil, errors.New("ssh: streamlocal-forward@openssh.com request denied by peer") + } + ch := c.forwards.add(&net.UnixAddr{Name: socketPath, Net: "unix"}) + + return &unixListener{socketPath, c, ch}, nil +} + +func (c *Client) dialStreamLocal(socketPath string) (Channel, error) { + msg := streamLocalChannelOpenDirectMsg{ + socketPath: socketPath, + } + ch, in, err := c.OpenChannel("direct-streamlocal@openssh.com", Marshal(&msg)) + if err != nil { + return nil, err + } + go DiscardRequests(in) + return ch, err +} + +type unixListener struct { + socketPath string + + conn *Client + in <-chan forward +} + +// Accept waits for and returns the next connection to the listener. +func (l *unixListener) Accept() (net.Conn, error) { + s, ok := <-l.in + if !ok { + return nil, io.EOF + } + ch, incoming, err := s.newCh.Accept() + if err != nil { + return nil, err + } + go DiscardRequests(incoming) + + return &chanConn{ + Channel: ch, + laddr: &net.UnixAddr{ + Name: l.socketPath, + Net: "unix", + }, + raddr: &net.UnixAddr{ + Name: "@", + Net: "unix", + }, + }, nil +} + +// Close closes the listener. +func (l *unixListener) Close() error { + // this also closes the listener. + l.conn.forwards.remove(&net.UnixAddr{Name: l.socketPath, Net: "unix"}) + m := streamLocalChannelForwardMsg{ + l.socketPath, + } + ok, _, err := l.conn.SendRequest("cancel-streamlocal-forward@openssh.com", true, Marshal(&m)) + if err == nil && !ok { + err = errors.New("ssh: cancel-streamlocal-forward@openssh.com failed") + } + return err +} + +// Addr returns the listener's network address. +func (l *unixListener) Addr() net.Addr { + return &net.UnixAddr{ + Name: l.socketPath, + Net: "unix", + } +} diff --git a/vendor/golang.org/x/crypto/ssh/tcpip.go b/vendor/golang.org/x/crypto/ssh/tcpip.go new file mode 100644 index 0000000..acf1717 --- /dev/null +++ b/vendor/golang.org/x/crypto/ssh/tcpip.go @@ -0,0 +1,465 @@ +// Copyright 2011 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package ssh + +import ( + "errors" + "fmt" + "io" + "math/rand" + "net" + "strconv" + "strings" + "sync" + "time" +) + +// Listen requests the remote peer open a listening socket on +// addr. Incoming connections will be available by calling Accept on +// the returned net.Listener. The listener must be serviced, or the +// SSH connection may hang. +// N must be "tcp", "tcp4", "tcp6", or "unix". +func (c *Client) Listen(n, addr string) (net.Listener, error) { + switch n { + case "tcp", "tcp4", "tcp6": + laddr, err := net.ResolveTCPAddr(n, addr) + if err != nil { + return nil, err + } + return c.ListenTCP(laddr) + case "unix": + return c.ListenUnix(addr) + default: + return nil, fmt.Errorf("ssh: unsupported protocol: %s", n) + } +} + +// Automatic port allocation is broken with OpenSSH before 6.0. See +// also https://bugzilla.mindrot.org/show_bug.cgi?id=2017. In +// particular, OpenSSH 5.9 sends a channelOpenMsg with port number 0, +// rather than the actual port number. This means you can never open +// two different listeners with auto allocated ports. We work around +// this by trying explicit ports until we succeed. + +const openSSHPrefix = "OpenSSH_" + +var portRandomizer = rand.New(rand.NewSource(time.Now().UnixNano())) + +// isBrokenOpenSSHVersion returns true if the given version string +// specifies a version of OpenSSH that is known to have a bug in port +// forwarding. +func isBrokenOpenSSHVersion(versionStr string) bool { + i := strings.Index(versionStr, openSSHPrefix) + if i < 0 { + return false + } + i += len(openSSHPrefix) + j := i + for ; j < len(versionStr); j++ { + if versionStr[j] < '0' || versionStr[j] > '9' { + break + } + } + version, _ := strconv.Atoi(versionStr[i:j]) + return version < 6 +} + +// autoPortListenWorkaround simulates automatic port allocation by +// trying random ports repeatedly. +func (c *Client) autoPortListenWorkaround(laddr *net.TCPAddr) (net.Listener, error) { + var sshListener net.Listener + var err error + const tries = 10 + for i := 0; i < tries; i++ { + addr := *laddr + addr.Port = 1024 + portRandomizer.Intn(60000) + sshListener, err = c.ListenTCP(&addr) + if err == nil { + laddr.Port = addr.Port + return sshListener, err + } + } + return nil, fmt.Errorf("ssh: listen on random port failed after %d tries: %v", tries, err) +} + +// RFC 4254 7.1 +type channelForwardMsg struct { + addr string + rport uint32 +} + +// ListenTCP requests the remote peer open a listening socket +// on laddr. Incoming connections will be available by calling +// Accept on the returned net.Listener. +func (c *Client) ListenTCP(laddr *net.TCPAddr) (net.Listener, error) { + if laddr.Port == 0 && isBrokenOpenSSHVersion(string(c.ServerVersion())) { + return c.autoPortListenWorkaround(laddr) + } + + m := channelForwardMsg{ + laddr.IP.String(), + uint32(laddr.Port), + } + // send message + ok, resp, err := c.SendRequest("tcpip-forward", true, Marshal(&m)) + if err != nil { + return nil, err + } + if !ok { + return nil, errors.New("ssh: tcpip-forward request denied by peer") + } + + // If the original port was 0, then the remote side will + // supply a real port number in the response. + if laddr.Port == 0 { + var p struct { + Port uint32 + } + if err := Unmarshal(resp, &p); err != nil { + return nil, err + } + laddr.Port = int(p.Port) + } + + // Register this forward, using the port number we obtained. + ch := c.forwards.add(laddr) + + return &tcpListener{laddr, c, ch}, nil +} + +// forwardList stores a mapping between remote +// forward requests and the tcpListeners. +type forwardList struct { + sync.Mutex + entries []forwardEntry +} + +// forwardEntry represents an established mapping of a laddr on a +// remote ssh server to a channel connected to a tcpListener. +type forwardEntry struct { + laddr net.Addr + c chan forward +} + +// forward represents an incoming forwarded tcpip connection. The +// arguments to add/remove/lookup should be address as specified in +// the original forward-request. +type forward struct { + newCh NewChannel // the ssh client channel underlying this forward + raddr net.Addr // the raddr of the incoming connection +} + +func (l *forwardList) add(addr net.Addr) chan forward { + l.Lock() + defer l.Unlock() + f := forwardEntry{ + laddr: addr, + c: make(chan forward, 1), + } + l.entries = append(l.entries, f) + return f.c +} + +// See RFC 4254, section 7.2 +type forwardedTCPPayload struct { + Addr string + Port uint32 + OriginAddr string + OriginPort uint32 +} + +// parseTCPAddr parses the originating address from the remote into a *net.TCPAddr. +func parseTCPAddr(addr string, port uint32) (*net.TCPAddr, error) { + if port == 0 || port > 65535 { + return nil, fmt.Errorf("ssh: port number out of range: %d", port) + } + ip := net.ParseIP(string(addr)) + if ip == nil { + return nil, fmt.Errorf("ssh: cannot parse IP address %q", addr) + } + return &net.TCPAddr{IP: ip, Port: int(port)}, nil +} + +func (l *forwardList) handleChannels(in <-chan NewChannel) { + for ch := range in { + var ( + laddr net.Addr + raddr net.Addr + err error + ) + switch channelType := ch.ChannelType(); channelType { + case "forwarded-tcpip": + var payload forwardedTCPPayload + if err = Unmarshal(ch.ExtraData(), &payload); err != nil { + ch.Reject(ConnectionFailed, "could not parse forwarded-tcpip payload: "+err.Error()) + continue + } + + // RFC 4254 section 7.2 specifies that incoming + // addresses should list the address, in string + // format. It is implied that this should be an IP + // address, as it would be impossible to connect to it + // otherwise. + laddr, err = parseTCPAddr(payload.Addr, payload.Port) + if err != nil { + ch.Reject(ConnectionFailed, err.Error()) + continue + } + raddr, err = parseTCPAddr(payload.OriginAddr, payload.OriginPort) + if err != nil { + ch.Reject(ConnectionFailed, err.Error()) + continue + } + + case "forwarded-streamlocal@openssh.com": + var payload forwardedStreamLocalPayload + if err = Unmarshal(ch.ExtraData(), &payload); err != nil { + ch.Reject(ConnectionFailed, "could not parse forwarded-streamlocal@openssh.com payload: "+err.Error()) + continue + } + laddr = &net.UnixAddr{ + Name: payload.SocketPath, + Net: "unix", + } + raddr = &net.UnixAddr{ + Name: "@", + Net: "unix", + } + default: + panic(fmt.Errorf("ssh: unknown channel type %s", channelType)) + } + if ok := l.forward(laddr, raddr, ch); !ok { + // Section 7.2, implementations MUST reject spurious incoming + // connections. + ch.Reject(Prohibited, "no forward for address") + continue + } + + } +} + +// remove removes the forward entry, and the channel feeding its +// listener. +func (l *forwardList) remove(addr net.Addr) { + l.Lock() + defer l.Unlock() + for i, f := range l.entries { + if addr.Network() == f.laddr.Network() && addr.String() == f.laddr.String() { + l.entries = append(l.entries[:i], l.entries[i+1:]...) + close(f.c) + return + } + } +} + +// closeAll closes and clears all forwards. +func (l *forwardList) closeAll() { + l.Lock() + defer l.Unlock() + for _, f := range l.entries { + close(f.c) + } + l.entries = nil +} + +func (l *forwardList) forward(laddr, raddr net.Addr, ch NewChannel) bool { + l.Lock() + defer l.Unlock() + for _, f := range l.entries { + if laddr.Network() == f.laddr.Network() && laddr.String() == f.laddr.String() { + f.c <- forward{newCh: ch, raddr: raddr} + return true + } + } + return false +} + +type tcpListener struct { + laddr *net.TCPAddr + + conn *Client + in <-chan forward +} + +// Accept waits for and returns the next connection to the listener. +func (l *tcpListener) Accept() (net.Conn, error) { + s, ok := <-l.in + if !ok { + return nil, io.EOF + } + ch, incoming, err := s.newCh.Accept() + if err != nil { + return nil, err + } + go DiscardRequests(incoming) + + return &chanConn{ + Channel: ch, + laddr: l.laddr, + raddr: s.raddr, + }, nil +} + +// Close closes the listener. +func (l *tcpListener) Close() error { + m := channelForwardMsg{ + l.laddr.IP.String(), + uint32(l.laddr.Port), + } + + // this also closes the listener. + l.conn.forwards.remove(l.laddr) + ok, _, err := l.conn.SendRequest("cancel-tcpip-forward", true, Marshal(&m)) + if err == nil && !ok { + err = errors.New("ssh: cancel-tcpip-forward failed") + } + return err +} + +// Addr returns the listener's network address. +func (l *tcpListener) Addr() net.Addr { + return l.laddr +} + +// Dial initiates a connection to the addr from the remote host. +// The resulting connection has a zero LocalAddr() and RemoteAddr(). +func (c *Client) Dial(n, addr string) (net.Conn, error) { + var ch Channel + switch n { + case "tcp", "tcp4", "tcp6": + // Parse the address into host and numeric port. + host, portString, err := net.SplitHostPort(addr) + if err != nil { + return nil, err + } + port, err := strconv.ParseUint(portString, 10, 16) + if err != nil { + return nil, err + } + ch, err = c.dial(net.IPv4zero.String(), 0, host, int(port)) + if err != nil { + return nil, err + } + // Use a zero address for local and remote address. + zeroAddr := &net.TCPAddr{ + IP: net.IPv4zero, + Port: 0, + } + return &chanConn{ + Channel: ch, + laddr: zeroAddr, + raddr: zeroAddr, + }, nil + case "unix": + var err error + ch, err = c.dialStreamLocal(addr) + if err != nil { + return nil, err + } + return &chanConn{ + Channel: ch, + laddr: &net.UnixAddr{ + Name: "@", + Net: "unix", + }, + raddr: &net.UnixAddr{ + Name: addr, + Net: "unix", + }, + }, nil + default: + return nil, fmt.Errorf("ssh: unsupported protocol: %s", n) + } +} + +// DialTCP connects to the remote address raddr on the network net, +// which must be "tcp", "tcp4", or "tcp6". If laddr is not nil, it is used +// as the local address for the connection. +func (c *Client) DialTCP(n string, laddr, raddr *net.TCPAddr) (net.Conn, error) { + if laddr == nil { + laddr = &net.TCPAddr{ + IP: net.IPv4zero, + Port: 0, + } + } + ch, err := c.dial(laddr.IP.String(), laddr.Port, raddr.IP.String(), raddr.Port) + if err != nil { + return nil, err + } + return &chanConn{ + Channel: ch, + laddr: laddr, + raddr: raddr, + }, nil +} + +// RFC 4254 7.2 +type channelOpenDirectMsg struct { + raddr string + rport uint32 + laddr string + lport uint32 +} + +func (c *Client) dial(laddr string, lport int, raddr string, rport int) (Channel, error) { + msg := channelOpenDirectMsg{ + raddr: raddr, + rport: uint32(rport), + laddr: laddr, + lport: uint32(lport), + } + ch, in, err := c.OpenChannel("direct-tcpip", Marshal(&msg)) + if err != nil { + return nil, err + } + go DiscardRequests(in) + return ch, err +} + +type tcpChan struct { + Channel // the backing channel +} + +// chanConn fulfills the net.Conn interface without +// the tcpChan having to hold laddr or raddr directly. +type chanConn struct { + Channel + laddr, raddr net.Addr +} + +// LocalAddr returns the local network address. +func (t *chanConn) LocalAddr() net.Addr { + return t.laddr +} + +// RemoteAddr returns the remote network address. +func (t *chanConn) RemoteAddr() net.Addr { + return t.raddr +} + +// SetDeadline sets the read and write deadlines associated +// with the connection. +func (t *chanConn) SetDeadline(deadline time.Time) error { + if err := t.SetReadDeadline(deadline); err != nil { + return err + } + return t.SetWriteDeadline(deadline) +} + +// SetReadDeadline sets the read deadline. +// A zero value for t means Read will not time out. +// After the deadline, the error from Read will implement net.Error +// with Timeout() == true. +func (t *chanConn) SetReadDeadline(deadline time.Time) error { + // for compatibility with previous version, + // the error message contains "tcpChan" + return errors.New("ssh: tcpChan: deadline not supported") +} + +// SetWriteDeadline exists to satisfy the net.Conn interface +// but is not implemented by this type. It always returns an error. +func (t *chanConn) SetWriteDeadline(deadline time.Time) error { + return errors.New("ssh: tcpChan: deadline not supported") +} diff --git a/vendor/golang.org/x/crypto/ssh/tcpip_test.go b/vendor/golang.org/x/crypto/ssh/tcpip_test.go new file mode 100644 index 0000000..f1265cb --- /dev/null +++ b/vendor/golang.org/x/crypto/ssh/tcpip_test.go @@ -0,0 +1,20 @@ +// Copyright 2014 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package ssh + +import ( + "testing" +) + +func TestAutoPortListenBroken(t *testing.T) { + broken := "SSH-2.0-OpenSSH_5.9hh11" + works := "SSH-2.0-OpenSSH_6.1" + if !isBrokenOpenSSHVersion(broken) { + t.Errorf("version %q not marked as broken", broken) + } + if isBrokenOpenSSHVersion(works) { + t.Errorf("version %q marked as broken", works) + } +} diff --git a/vendor/golang.org/x/crypto/ssh/terminal/terminal.go b/vendor/golang.org/x/crypto/ssh/terminal/terminal.go new file mode 100644 index 0000000..18379a9 --- /dev/null +++ b/vendor/golang.org/x/crypto/ssh/terminal/terminal.go @@ -0,0 +1,951 @@ +// Copyright 2011 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package terminal + +import ( + "bytes" + "io" + "sync" + "unicode/utf8" +) + +// EscapeCodes contains escape sequences that can be written to the terminal in +// order to achieve different styles of text. +type EscapeCodes struct { + // Foreground colors + Black, Red, Green, Yellow, Blue, Magenta, Cyan, White []byte + + // Reset all attributes + Reset []byte +} + +var vt100EscapeCodes = EscapeCodes{ + Black: []byte{keyEscape, '[', '3', '0', 'm'}, + Red: []byte{keyEscape, '[', '3', '1', 'm'}, + Green: []byte{keyEscape, '[', '3', '2', 'm'}, + Yellow: []byte{keyEscape, '[', '3', '3', 'm'}, + Blue: []byte{keyEscape, '[', '3', '4', 'm'}, + Magenta: []byte{keyEscape, '[', '3', '5', 'm'}, + Cyan: []byte{keyEscape, '[', '3', '6', 'm'}, + White: []byte{keyEscape, '[', '3', '7', 'm'}, + + Reset: []byte{keyEscape, '[', '0', 'm'}, +} + +// Terminal contains the state for running a VT100 terminal that is capable of +// reading lines of input. +type Terminal struct { + // AutoCompleteCallback, if non-null, is called for each keypress with + // the full input line and the current position of the cursor (in + // bytes, as an index into |line|). If it returns ok=false, the key + // press is processed normally. Otherwise it returns a replacement line + // and the new cursor position. + AutoCompleteCallback func(line string, pos int, key rune) (newLine string, newPos int, ok bool) + + // Escape contains a pointer to the escape codes for this terminal. + // It's always a valid pointer, although the escape codes themselves + // may be empty if the terminal doesn't support them. + Escape *EscapeCodes + + // lock protects the terminal and the state in this object from + // concurrent processing of a key press and a Write() call. + lock sync.Mutex + + c io.ReadWriter + prompt []rune + + // line is the current line being entered. + line []rune + // pos is the logical position of the cursor in line + pos int + // echo is true if local echo is enabled + echo bool + // pasteActive is true iff there is a bracketed paste operation in + // progress. + pasteActive bool + + // cursorX contains the current X value of the cursor where the left + // edge is 0. cursorY contains the row number where the first row of + // the current line is 0. + cursorX, cursorY int + // maxLine is the greatest value of cursorY so far. + maxLine int + + termWidth, termHeight int + + // outBuf contains the terminal data to be sent. + outBuf []byte + // remainder contains the remainder of any partial key sequences after + // a read. It aliases into inBuf. + remainder []byte + inBuf [256]byte + + // history contains previously entered commands so that they can be + // accessed with the up and down keys. + history stRingBuffer + // historyIndex stores the currently accessed history entry, where zero + // means the immediately previous entry. + historyIndex int + // When navigating up and down the history it's possible to return to + // the incomplete, initial line. That value is stored in + // historyPending. + historyPending string +} + +// NewTerminal runs a VT100 terminal on the given ReadWriter. If the ReadWriter is +// a local terminal, that terminal must first have been put into raw mode. +// prompt is a string that is written at the start of each input line (i.e. +// "> "). +func NewTerminal(c io.ReadWriter, prompt string) *Terminal { + return &Terminal{ + Escape: &vt100EscapeCodes, + c: c, + prompt: []rune(prompt), + termWidth: 80, + termHeight: 24, + echo: true, + historyIndex: -1, + } +} + +const ( + keyCtrlD = 4 + keyCtrlU = 21 + keyEnter = '\r' + keyEscape = 27 + keyBackspace = 127 + keyUnknown = 0xd800 /* UTF-16 surrogate area */ + iota + keyUp + keyDown + keyLeft + keyRight + keyAltLeft + keyAltRight + keyHome + keyEnd + keyDeleteWord + keyDeleteLine + keyClearScreen + keyPasteStart + keyPasteEnd +) + +var ( + crlf = []byte{'\r', '\n'} + pasteStart = []byte{keyEscape, '[', '2', '0', '0', '~'} + pasteEnd = []byte{keyEscape, '[', '2', '0', '1', '~'} +) + +// bytesToKey tries to parse a key sequence from b. If successful, it returns +// the key and the remainder of the input. Otherwise it returns utf8.RuneError. +func bytesToKey(b []byte, pasteActive bool) (rune, []byte) { + if len(b) == 0 { + return utf8.RuneError, nil + } + + if !pasteActive { + switch b[0] { + case 1: // ^A + return keyHome, b[1:] + case 5: // ^E + return keyEnd, b[1:] + case 8: // ^H + return keyBackspace, b[1:] + case 11: // ^K + return keyDeleteLine, b[1:] + case 12: // ^L + return keyClearScreen, b[1:] + case 23: // ^W + return keyDeleteWord, b[1:] + } + } + + if b[0] != keyEscape { + if !utf8.FullRune(b) { + return utf8.RuneError, b + } + r, l := utf8.DecodeRune(b) + return r, b[l:] + } + + if !pasteActive && len(b) >= 3 && b[0] == keyEscape && b[1] == '[' { + switch b[2] { + case 'A': + return keyUp, b[3:] + case 'B': + return keyDown, b[3:] + case 'C': + return keyRight, b[3:] + case 'D': + return keyLeft, b[3:] + case 'H': + return keyHome, b[3:] + case 'F': + return keyEnd, b[3:] + } + } + + if !pasteActive && len(b) >= 6 && b[0] == keyEscape && b[1] == '[' && b[2] == '1' && b[3] == ';' && b[4] == '3' { + switch b[5] { + case 'C': + return keyAltRight, b[6:] + case 'D': + return keyAltLeft, b[6:] + } + } + + if !pasteActive && len(b) >= 6 && bytes.Equal(b[:6], pasteStart) { + return keyPasteStart, b[6:] + } + + if pasteActive && len(b) >= 6 && bytes.Equal(b[:6], pasteEnd) { + return keyPasteEnd, b[6:] + } + + // If we get here then we have a key that we don't recognise, or a + // partial sequence. It's not clear how one should find the end of a + // sequence without knowing them all, but it seems that [a-zA-Z~] only + // appears at the end of a sequence. + for i, c := range b[0:] { + if c >= 'a' && c <= 'z' || c >= 'A' && c <= 'Z' || c == '~' { + return keyUnknown, b[i+1:] + } + } + + return utf8.RuneError, b +} + +// queue appends data to the end of t.outBuf +func (t *Terminal) queue(data []rune) { + t.outBuf = append(t.outBuf, []byte(string(data))...) +} + +var eraseUnderCursor = []rune{' ', keyEscape, '[', 'D'} +var space = []rune{' '} + +func isPrintable(key rune) bool { + isInSurrogateArea := key >= 0xd800 && key <= 0xdbff + return key >= 32 && !isInSurrogateArea +} + +// moveCursorToPos appends data to t.outBuf which will move the cursor to the +// given, logical position in the text. +func (t *Terminal) moveCursorToPos(pos int) { + if !t.echo { + return + } + + x := visualLength(t.prompt) + pos + y := x / t.termWidth + x = x % t.termWidth + + up := 0 + if y < t.cursorY { + up = t.cursorY - y + } + + down := 0 + if y > t.cursorY { + down = y - t.cursorY + } + + left := 0 + if x < t.cursorX { + left = t.cursorX - x + } + + right := 0 + if x > t.cursorX { + right = x - t.cursorX + } + + t.cursorX = x + t.cursorY = y + t.move(up, down, left, right) +} + +func (t *Terminal) move(up, down, left, right int) { + movement := make([]rune, 3*(up+down+left+right)) + m := movement + for i := 0; i < up; i++ { + m[0] = keyEscape + m[1] = '[' + m[2] = 'A' + m = m[3:] + } + for i := 0; i < down; i++ { + m[0] = keyEscape + m[1] = '[' + m[2] = 'B' + m = m[3:] + } + for i := 0; i < left; i++ { + m[0] = keyEscape + m[1] = '[' + m[2] = 'D' + m = m[3:] + } + for i := 0; i < right; i++ { + m[0] = keyEscape + m[1] = '[' + m[2] = 'C' + m = m[3:] + } + + t.queue(movement) +} + +func (t *Terminal) clearLineToRight() { + op := []rune{keyEscape, '[', 'K'} + t.queue(op) +} + +const maxLineLength = 4096 + +func (t *Terminal) setLine(newLine []rune, newPos int) { + if t.echo { + t.moveCursorToPos(0) + t.writeLine(newLine) + for i := len(newLine); i < len(t.line); i++ { + t.writeLine(space) + } + t.moveCursorToPos(newPos) + } + t.line = newLine + t.pos = newPos +} + +func (t *Terminal) advanceCursor(places int) { + t.cursorX += places + t.cursorY += t.cursorX / t.termWidth + if t.cursorY > t.maxLine { + t.maxLine = t.cursorY + } + t.cursorX = t.cursorX % t.termWidth + + if places > 0 && t.cursorX == 0 { + // Normally terminals will advance the current position + // when writing a character. But that doesn't happen + // for the last character in a line. However, when + // writing a character (except a new line) that causes + // a line wrap, the position will be advanced two + // places. + // + // So, if we are stopping at the end of a line, we + // need to write a newline so that our cursor can be + // advanced to the next line. + t.outBuf = append(t.outBuf, '\r', '\n') + } +} + +func (t *Terminal) eraseNPreviousChars(n int) { + if n == 0 { + return + } + + if t.pos < n { + n = t.pos + } + t.pos -= n + t.moveCursorToPos(t.pos) + + copy(t.line[t.pos:], t.line[n+t.pos:]) + t.line = t.line[:len(t.line)-n] + if t.echo { + t.writeLine(t.line[t.pos:]) + for i := 0; i < n; i++ { + t.queue(space) + } + t.advanceCursor(n) + t.moveCursorToPos(t.pos) + } +} + +// countToLeftWord returns then number of characters from the cursor to the +// start of the previous word. +func (t *Terminal) countToLeftWord() int { + if t.pos == 0 { + return 0 + } + + pos := t.pos - 1 + for pos > 0 { + if t.line[pos] != ' ' { + break + } + pos-- + } + for pos > 0 { + if t.line[pos] == ' ' { + pos++ + break + } + pos-- + } + + return t.pos - pos +} + +// countToRightWord returns then number of characters from the cursor to the +// start of the next word. +func (t *Terminal) countToRightWord() int { + pos := t.pos + for pos < len(t.line) { + if t.line[pos] == ' ' { + break + } + pos++ + } + for pos < len(t.line) { + if t.line[pos] != ' ' { + break + } + pos++ + } + return pos - t.pos +} + +// visualLength returns the number of visible glyphs in s. +func visualLength(runes []rune) int { + inEscapeSeq := false + length := 0 + + for _, r := range runes { + switch { + case inEscapeSeq: + if (r >= 'a' && r <= 'z') || (r >= 'A' && r <= 'Z') { + inEscapeSeq = false + } + case r == '\x1b': + inEscapeSeq = true + default: + length++ + } + } + + return length +} + +// handleKey processes the given key and, optionally, returns a line of text +// that the user has entered. +func (t *Terminal) handleKey(key rune) (line string, ok bool) { + if t.pasteActive && key != keyEnter { + t.addKeyToLine(key) + return + } + + switch key { + case keyBackspace: + if t.pos == 0 { + return + } + t.eraseNPreviousChars(1) + case keyAltLeft: + // move left by a word. + t.pos -= t.countToLeftWord() + t.moveCursorToPos(t.pos) + case keyAltRight: + // move right by a word. + t.pos += t.countToRightWord() + t.moveCursorToPos(t.pos) + case keyLeft: + if t.pos == 0 { + return + } + t.pos-- + t.moveCursorToPos(t.pos) + case keyRight: + if t.pos == len(t.line) { + return + } + t.pos++ + t.moveCursorToPos(t.pos) + case keyHome: + if t.pos == 0 { + return + } + t.pos = 0 + t.moveCursorToPos(t.pos) + case keyEnd: + if t.pos == len(t.line) { + return + } + t.pos = len(t.line) + t.moveCursorToPos(t.pos) + case keyUp: + entry, ok := t.history.NthPreviousEntry(t.historyIndex + 1) + if !ok { + return "", false + } + if t.historyIndex == -1 { + t.historyPending = string(t.line) + } + t.historyIndex++ + runes := []rune(entry) + t.setLine(runes, len(runes)) + case keyDown: + switch t.historyIndex { + case -1: + return + case 0: + runes := []rune(t.historyPending) + t.setLine(runes, len(runes)) + t.historyIndex-- + default: + entry, ok := t.history.NthPreviousEntry(t.historyIndex - 1) + if ok { + t.historyIndex-- + runes := []rune(entry) + t.setLine(runes, len(runes)) + } + } + case keyEnter: + t.moveCursorToPos(len(t.line)) + t.queue([]rune("\r\n")) + line = string(t.line) + ok = true + t.line = t.line[:0] + t.pos = 0 + t.cursorX = 0 + t.cursorY = 0 + t.maxLine = 0 + case keyDeleteWord: + // Delete zero or more spaces and then one or more characters. + t.eraseNPreviousChars(t.countToLeftWord()) + case keyDeleteLine: + // Delete everything from the current cursor position to the + // end of line. + for i := t.pos; i < len(t.line); i++ { + t.queue(space) + t.advanceCursor(1) + } + t.line = t.line[:t.pos] + t.moveCursorToPos(t.pos) + case keyCtrlD: + // Erase the character under the current position. + // The EOF case when the line is empty is handled in + // readLine(). + if t.pos < len(t.line) { + t.pos++ + t.eraseNPreviousChars(1) + } + case keyCtrlU: + t.eraseNPreviousChars(t.pos) + case keyClearScreen: + // Erases the screen and moves the cursor to the home position. + t.queue([]rune("\x1b[2J\x1b[H")) + t.queue(t.prompt) + t.cursorX, t.cursorY = 0, 0 + t.advanceCursor(visualLength(t.prompt)) + t.setLine(t.line, t.pos) + default: + if t.AutoCompleteCallback != nil { + prefix := string(t.line[:t.pos]) + suffix := string(t.line[t.pos:]) + + t.lock.Unlock() + newLine, newPos, completeOk := t.AutoCompleteCallback(prefix+suffix, len(prefix), key) + t.lock.Lock() + + if completeOk { + t.setLine([]rune(newLine), utf8.RuneCount([]byte(newLine)[:newPos])) + return + } + } + if !isPrintable(key) { + return + } + if len(t.line) == maxLineLength { + return + } + t.addKeyToLine(key) + } + return +} + +// addKeyToLine inserts the given key at the current position in the current +// line. +func (t *Terminal) addKeyToLine(key rune) { + if len(t.line) == cap(t.line) { + newLine := make([]rune, len(t.line), 2*(1+len(t.line))) + copy(newLine, t.line) + t.line = newLine + } + t.line = t.line[:len(t.line)+1] + copy(t.line[t.pos+1:], t.line[t.pos:]) + t.line[t.pos] = key + if t.echo { + t.writeLine(t.line[t.pos:]) + } + t.pos++ + t.moveCursorToPos(t.pos) +} + +func (t *Terminal) writeLine(line []rune) { + for len(line) != 0 { + remainingOnLine := t.termWidth - t.cursorX + todo := len(line) + if todo > remainingOnLine { + todo = remainingOnLine + } + t.queue(line[:todo]) + t.advanceCursor(visualLength(line[:todo])) + line = line[todo:] + } +} + +// writeWithCRLF writes buf to w but replaces all occurrences of \n with \r\n. +func writeWithCRLF(w io.Writer, buf []byte) (n int, err error) { + for len(buf) > 0 { + i := bytes.IndexByte(buf, '\n') + todo := len(buf) + if i >= 0 { + todo = i + } + + var nn int + nn, err = w.Write(buf[:todo]) + n += nn + if err != nil { + return n, err + } + buf = buf[todo:] + + if i >= 0 { + if _, err = w.Write(crlf); err != nil { + return n, err + } + n += 1 + buf = buf[1:] + } + } + + return n, nil +} + +func (t *Terminal) Write(buf []byte) (n int, err error) { + t.lock.Lock() + defer t.lock.Unlock() + + if t.cursorX == 0 && t.cursorY == 0 { + // This is the easy case: there's nothing on the screen that we + // have to move out of the way. + return writeWithCRLF(t.c, buf) + } + + // We have a prompt and possibly user input on the screen. We + // have to clear it first. + t.move(0 /* up */, 0 /* down */, t.cursorX /* left */, 0 /* right */) + t.cursorX = 0 + t.clearLineToRight() + + for t.cursorY > 0 { + t.move(1 /* up */, 0, 0, 0) + t.cursorY-- + t.clearLineToRight() + } + + if _, err = t.c.Write(t.outBuf); err != nil { + return + } + t.outBuf = t.outBuf[:0] + + if n, err = writeWithCRLF(t.c, buf); err != nil { + return + } + + t.writeLine(t.prompt) + if t.echo { + t.writeLine(t.line) + } + + t.moveCursorToPos(t.pos) + + if _, err = t.c.Write(t.outBuf); err != nil { + return + } + t.outBuf = t.outBuf[:0] + return +} + +// ReadPassword temporarily changes the prompt and reads a password, without +// echo, from the terminal. +func (t *Terminal) ReadPassword(prompt string) (line string, err error) { + t.lock.Lock() + defer t.lock.Unlock() + + oldPrompt := t.prompt + t.prompt = []rune(prompt) + t.echo = false + + line, err = t.readLine() + + t.prompt = oldPrompt + t.echo = true + + return +} + +// ReadLine returns a line of input from the terminal. +func (t *Terminal) ReadLine() (line string, err error) { + t.lock.Lock() + defer t.lock.Unlock() + + return t.readLine() +} + +func (t *Terminal) readLine() (line string, err error) { + // t.lock must be held at this point + + if t.cursorX == 0 && t.cursorY == 0 { + t.writeLine(t.prompt) + t.c.Write(t.outBuf) + t.outBuf = t.outBuf[:0] + } + + lineIsPasted := t.pasteActive + + for { + rest := t.remainder + lineOk := false + for !lineOk { + var key rune + key, rest = bytesToKey(rest, t.pasteActive) + if key == utf8.RuneError { + break + } + if !t.pasteActive { + if key == keyCtrlD { + if len(t.line) == 0 { + return "", io.EOF + } + } + if key == keyPasteStart { + t.pasteActive = true + if len(t.line) == 0 { + lineIsPasted = true + } + continue + } + } else if key == keyPasteEnd { + t.pasteActive = false + continue + } + if !t.pasteActive { + lineIsPasted = false + } + line, lineOk = t.handleKey(key) + } + if len(rest) > 0 { + n := copy(t.inBuf[:], rest) + t.remainder = t.inBuf[:n] + } else { + t.remainder = nil + } + t.c.Write(t.outBuf) + t.outBuf = t.outBuf[:0] + if lineOk { + if t.echo { + t.historyIndex = -1 + t.history.Add(line) + } + if lineIsPasted { + err = ErrPasteIndicator + } + return + } + + // t.remainder is a slice at the beginning of t.inBuf + // containing a partial key sequence + readBuf := t.inBuf[len(t.remainder):] + var n int + + t.lock.Unlock() + n, err = t.c.Read(readBuf) + t.lock.Lock() + + if err != nil { + return + } + + t.remainder = t.inBuf[:n+len(t.remainder)] + } +} + +// SetPrompt sets the prompt to be used when reading subsequent lines. +func (t *Terminal) SetPrompt(prompt string) { + t.lock.Lock() + defer t.lock.Unlock() + + t.prompt = []rune(prompt) +} + +func (t *Terminal) clearAndRepaintLinePlusNPrevious(numPrevLines int) { + // Move cursor to column zero at the start of the line. + t.move(t.cursorY, 0, t.cursorX, 0) + t.cursorX, t.cursorY = 0, 0 + t.clearLineToRight() + for t.cursorY < numPrevLines { + // Move down a line + t.move(0, 1, 0, 0) + t.cursorY++ + t.clearLineToRight() + } + // Move back to beginning. + t.move(t.cursorY, 0, 0, 0) + t.cursorX, t.cursorY = 0, 0 + + t.queue(t.prompt) + t.advanceCursor(visualLength(t.prompt)) + t.writeLine(t.line) + t.moveCursorToPos(t.pos) +} + +func (t *Terminal) SetSize(width, height int) error { + t.lock.Lock() + defer t.lock.Unlock() + + if width == 0 { + width = 1 + } + + oldWidth := t.termWidth + t.termWidth, t.termHeight = width, height + + switch { + case width == oldWidth: + // If the width didn't change then nothing else needs to be + // done. + return nil + case len(t.line) == 0 && t.cursorX == 0 && t.cursorY == 0: + // If there is nothing on current line and no prompt printed, + // just do nothing + return nil + case width < oldWidth: + // Some terminals (e.g. xterm) will truncate lines that were + // too long when shinking. Others, (e.g. gnome-terminal) will + // attempt to wrap them. For the former, repainting t.maxLine + // works great, but that behaviour goes badly wrong in the case + // of the latter because they have doubled every full line. + + // We assume that we are working on a terminal that wraps lines + // and adjust the cursor position based on every previous line + // wrapping and turning into two. This causes the prompt on + // xterms to move upwards, which isn't great, but it avoids a + // huge mess with gnome-terminal. + if t.cursorX >= t.termWidth { + t.cursorX = t.termWidth - 1 + } + t.cursorY *= 2 + t.clearAndRepaintLinePlusNPrevious(t.maxLine * 2) + case width > oldWidth: + // If the terminal expands then our position calculations will + // be wrong in the future because we think the cursor is + // |t.pos| chars into the string, but there will be a gap at + // the end of any wrapped line. + // + // But the position will actually be correct until we move, so + // we can move back to the beginning and repaint everything. + t.clearAndRepaintLinePlusNPrevious(t.maxLine) + } + + _, err := t.c.Write(t.outBuf) + t.outBuf = t.outBuf[:0] + return err +} + +type pasteIndicatorError struct{} + +func (pasteIndicatorError) Error() string { + return "terminal: ErrPasteIndicator not correctly handled" +} + +// ErrPasteIndicator may be returned from ReadLine as the error, in addition +// to valid line data. It indicates that bracketed paste mode is enabled and +// that the returned line consists only of pasted data. Programs may wish to +// interpret pasted data more literally than typed data. +var ErrPasteIndicator = pasteIndicatorError{} + +// SetBracketedPasteMode requests that the terminal bracket paste operations +// with markers. Not all terminals support this but, if it is supported, then +// enabling this mode will stop any autocomplete callback from running due to +// pastes. Additionally, any lines that are completely pasted will be returned +// from ReadLine with the error set to ErrPasteIndicator. +func (t *Terminal) SetBracketedPasteMode(on bool) { + if on { + io.WriteString(t.c, "\x1b[?2004h") + } else { + io.WriteString(t.c, "\x1b[?2004l") + } +} + +// stRingBuffer is a ring buffer of strings. +type stRingBuffer struct { + // entries contains max elements. + entries []string + max int + // head contains the index of the element most recently added to the ring. + head int + // size contains the number of elements in the ring. + size int +} + +func (s *stRingBuffer) Add(a string) { + if s.entries == nil { + const defaultNumEntries = 100 + s.entries = make([]string, defaultNumEntries) + s.max = defaultNumEntries + } + + s.head = (s.head + 1) % s.max + s.entries[s.head] = a + if s.size < s.max { + s.size++ + } +} + +// NthPreviousEntry returns the value passed to the nth previous call to Add. +// If n is zero then the immediately prior value is returned, if one, then the +// next most recent, and so on. If such an element doesn't exist then ok is +// false. +func (s *stRingBuffer) NthPreviousEntry(n int) (value string, ok bool) { + if n >= s.size { + return "", false + } + index := s.head - n + if index < 0 { + index += s.max + } + return s.entries[index], true +} + +// readPasswordLine reads from reader until it finds \n or io.EOF. +// The slice returned does not include the \n. +// readPasswordLine also ignores any \r it finds. +func readPasswordLine(reader io.Reader) ([]byte, error) { + var buf [1]byte + var ret []byte + + for { + n, err := reader.Read(buf[:]) + if n > 0 { + switch buf[0] { + case '\n': + return ret, nil + case '\r': + // remove \r from passwords on Windows + default: + ret = append(ret, buf[0]) + } + continue + } + if err != nil { + if err == io.EOF && len(ret) > 0 { + return ret, nil + } + return ret, err + } + } +} diff --git a/vendor/golang.org/x/crypto/ssh/terminal/terminal_test.go b/vendor/golang.org/x/crypto/ssh/terminal/terminal_test.go new file mode 100644 index 0000000..901c72a --- /dev/null +++ b/vendor/golang.org/x/crypto/ssh/terminal/terminal_test.go @@ -0,0 +1,350 @@ +// Copyright 2011 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package terminal + +import ( + "bytes" + "io" + "os" + "testing" +) + +type MockTerminal struct { + toSend []byte + bytesPerRead int + received []byte +} + +func (c *MockTerminal) Read(data []byte) (n int, err error) { + n = len(data) + if n == 0 { + return + } + if n > len(c.toSend) { + n = len(c.toSend) + } + if n == 0 { + return 0, io.EOF + } + if c.bytesPerRead > 0 && n > c.bytesPerRead { + n = c.bytesPerRead + } + copy(data, c.toSend[:n]) + c.toSend = c.toSend[n:] + return +} + +func (c *MockTerminal) Write(data []byte) (n int, err error) { + c.received = append(c.received, data...) + return len(data), nil +} + +func TestClose(t *testing.T) { + c := &MockTerminal{} + ss := NewTerminal(c, "> ") + line, err := ss.ReadLine() + if line != "" { + t.Errorf("Expected empty line but got: %s", line) + } + if err != io.EOF { + t.Errorf("Error should have been EOF but got: %s", err) + } +} + +var keyPressTests = []struct { + in string + line string + err error + throwAwayLines int +}{ + { + err: io.EOF, + }, + { + in: "\r", + line: "", + }, + { + in: "foo\r", + line: "foo", + }, + { + in: "a\x1b[Cb\r", // right + line: "ab", + }, + { + in: "a\x1b[Db\r", // left + line: "ba", + }, + { + in: "a\177b\r", // backspace + line: "b", + }, + { + in: "\x1b[A\r", // up + }, + { + in: "\x1b[B\r", // down + }, + { + in: "line\x1b[A\x1b[B\r", // up then down + line: "line", + }, + { + in: "line1\rline2\x1b[A\r", // recall previous line. + line: "line1", + throwAwayLines: 1, + }, + { + // recall two previous lines and append. + in: "line1\rline2\rline3\x1b[A\x1b[Axxx\r", + line: "line1xxx", + throwAwayLines: 2, + }, + { + // Ctrl-A to move to beginning of line followed by ^K to kill + // line. + in: "a b \001\013\r", + line: "", + }, + { + // Ctrl-A to move to beginning of line, Ctrl-E to move to end, + // finally ^K to kill nothing. + in: "a b \001\005\013\r", + line: "a b ", + }, + { + in: "\027\r", + line: "", + }, + { + in: "a\027\r", + line: "", + }, + { + in: "a \027\r", + line: "", + }, + { + in: "a b\027\r", + line: "a ", + }, + { + in: "a b \027\r", + line: "a ", + }, + { + in: "one two thr\x1b[D\027\r", + line: "one two r", + }, + { + in: "\013\r", + line: "", + }, + { + in: "a\013\r", + line: "a", + }, + { + in: "ab\x1b[D\013\r", + line: "a", + }, + { + in: "Ξεσκεπάζω\r", + line: "Ξεσκεπάζω", + }, + { + in: "£\r\x1b[A\177\r", // non-ASCII char, enter, up, backspace. + line: "", + throwAwayLines: 1, + }, + { + in: "£\r££\x1b[A\x1b[B\177\r", // non-ASCII char, enter, 2x non-ASCII, up, down, backspace, enter. + line: "£", + throwAwayLines: 1, + }, + { + // Ctrl-D at the end of the line should be ignored. + in: "a\004\r", + line: "a", + }, + { + // a, b, left, Ctrl-D should erase the b. + in: "ab\x1b[D\004\r", + line: "a", + }, + { + // a, b, c, d, left, left, ^U should erase to the beginning of + // the line. + in: "abcd\x1b[D\x1b[D\025\r", + line: "cd", + }, + { + // Bracketed paste mode: control sequences should be returned + // verbatim in paste mode. + in: "abc\x1b[200~de\177f\x1b[201~\177\r", + line: "abcde\177", + }, + { + // Enter in bracketed paste mode should still work. + in: "abc\x1b[200~d\refg\x1b[201~h\r", + line: "efgh", + throwAwayLines: 1, + }, + { + // Lines consisting entirely of pasted data should be indicated as such. + in: "\x1b[200~a\r", + line: "a", + err: ErrPasteIndicator, + }, +} + +func TestKeyPresses(t *testing.T) { + for i, test := range keyPressTests { + for j := 1; j < len(test.in); j++ { + c := &MockTerminal{ + toSend: []byte(test.in), + bytesPerRead: j, + } + ss := NewTerminal(c, "> ") + for k := 0; k < test.throwAwayLines; k++ { + _, err := ss.ReadLine() + if err != nil { + t.Errorf("Throwaway line %d from test %d resulted in error: %s", k, i, err) + } + } + line, err := ss.ReadLine() + if line != test.line { + t.Errorf("Line resulting from test %d (%d bytes per read) was '%s', expected '%s'", i, j, line, test.line) + break + } + if err != test.err { + t.Errorf("Error resulting from test %d (%d bytes per read) was '%v', expected '%v'", i, j, err, test.err) + break + } + } + } +} + +func TestPasswordNotSaved(t *testing.T) { + c := &MockTerminal{ + toSend: []byte("password\r\x1b[A\r"), + bytesPerRead: 1, + } + ss := NewTerminal(c, "> ") + pw, _ := ss.ReadPassword("> ") + if pw != "password" { + t.Fatalf("failed to read password, got %s", pw) + } + line, _ := ss.ReadLine() + if len(line) > 0 { + t.Fatalf("password was saved in history") + } +} + +var setSizeTests = []struct { + width, height int +}{ + {40, 13}, + {80, 24}, + {132, 43}, +} + +func TestTerminalSetSize(t *testing.T) { + for _, setSize := range setSizeTests { + c := &MockTerminal{ + toSend: []byte("password\r\x1b[A\r"), + bytesPerRead: 1, + } + ss := NewTerminal(c, "> ") + ss.SetSize(setSize.width, setSize.height) + pw, _ := ss.ReadPassword("Password: ") + if pw != "password" { + t.Fatalf("failed to read password, got %s", pw) + } + if string(c.received) != "Password: \r\n" { + t.Errorf("failed to set the temporary prompt expected %q, got %q", "Password: ", c.received) + } + } +} + +func TestReadPasswordLineEnd(t *testing.T) { + var tests = []struct { + input string + want string + }{ + {"\n", ""}, + {"\r\n", ""}, + {"test\r\n", "test"}, + {"testtesttesttes\n", "testtesttesttes"}, + {"testtesttesttes\r\n", "testtesttesttes"}, + {"testtesttesttesttest\n", "testtesttesttesttest"}, + {"testtesttesttesttest\r\n", "testtesttesttesttest"}, + } + for _, test := range tests { + buf := new(bytes.Buffer) + if _, err := buf.WriteString(test.input); err != nil { + t.Fatal(err) + } + + have, err := readPasswordLine(buf) + if err != nil { + t.Errorf("readPasswordLine(%q) failed: %v", test.input, err) + continue + } + if string(have) != test.want { + t.Errorf("readPasswordLine(%q) returns %q, but %q is expected", test.input, string(have), test.want) + continue + } + + if _, err = buf.WriteString(test.input); err != nil { + t.Fatal(err) + } + have, err = readPasswordLine(buf) + if err != nil { + t.Errorf("readPasswordLine(%q) failed: %v", test.input, err) + continue + } + if string(have) != test.want { + t.Errorf("readPasswordLine(%q) returns %q, but %q is expected", test.input, string(have), test.want) + continue + } + } +} + +func TestMakeRawState(t *testing.T) { + fd := int(os.Stdout.Fd()) + if !IsTerminal(fd) { + t.Skip("stdout is not a terminal; skipping test") + } + + st, err := GetState(fd) + if err != nil { + t.Fatalf("failed to get terminal state from GetState: %s", err) + } + defer Restore(fd, st) + raw, err := MakeRaw(fd) + if err != nil { + t.Fatalf("failed to get terminal state from MakeRaw: %s", err) + } + + if *st != *raw { + t.Errorf("states do not match; was %v, expected %v", raw, st) + } +} + +func TestOutputNewlines(t *testing.T) { + // \n should be changed to \r\n in terminal output. + buf := new(bytes.Buffer) + term := NewTerminal(buf, ">") + + term.Write([]byte("1\n2\n")) + output := string(buf.Bytes()) + const expected = "1\r\n2\r\n" + + if output != expected { + t.Errorf("incorrect output: was %q, expected %q", output, expected) + } +} diff --git a/vendor/golang.org/x/crypto/ssh/terminal/util.go b/vendor/golang.org/x/crypto/ssh/terminal/util.go new file mode 100644 index 0000000..d019196 --- /dev/null +++ b/vendor/golang.org/x/crypto/ssh/terminal/util.go @@ -0,0 +1,119 @@ +// Copyright 2011 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// +build darwin dragonfly freebsd linux,!appengine netbsd openbsd + +// Package terminal provides support functions for dealing with terminals, as +// commonly found on UNIX systems. +// +// Putting a terminal into raw mode is the most common requirement: +// +// oldState, err := terminal.MakeRaw(0) +// if err != nil { +// panic(err) +// } +// defer terminal.Restore(0, oldState) +package terminal // import "golang.org/x/crypto/ssh/terminal" + +import ( + "syscall" + "unsafe" +) + +// State contains the state of a terminal. +type State struct { + termios syscall.Termios +} + +// IsTerminal returns true if the given file descriptor is a terminal. +func IsTerminal(fd int) bool { + var termios syscall.Termios + _, _, err := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), ioctlReadTermios, uintptr(unsafe.Pointer(&termios)), 0, 0, 0) + return err == 0 +} + +// MakeRaw put the terminal connected to the given file descriptor into raw +// mode and returns the previous state of the terminal so that it can be +// restored. +func MakeRaw(fd int) (*State, error) { + var oldState State + if _, _, err := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), ioctlReadTermios, uintptr(unsafe.Pointer(&oldState.termios)), 0, 0, 0); err != 0 { + return nil, err + } + + newState := oldState.termios + // This attempts to replicate the behaviour documented for cfmakeraw in + // the termios(3) manpage. + newState.Iflag &^= syscall.IGNBRK | syscall.BRKINT | syscall.PARMRK | syscall.ISTRIP | syscall.INLCR | syscall.IGNCR | syscall.ICRNL | syscall.IXON + newState.Oflag &^= syscall.OPOST + newState.Lflag &^= syscall.ECHO | syscall.ECHONL | syscall.ICANON | syscall.ISIG | syscall.IEXTEN + newState.Cflag &^= syscall.CSIZE | syscall.PARENB + newState.Cflag |= syscall.CS8 + if _, _, err := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), ioctlWriteTermios, uintptr(unsafe.Pointer(&newState)), 0, 0, 0); err != 0 { + return nil, err + } + + return &oldState, nil +} + +// GetState returns the current state of a terminal which may be useful to +// restore the terminal after a signal. +func GetState(fd int) (*State, error) { + var oldState State + if _, _, err := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), ioctlReadTermios, uintptr(unsafe.Pointer(&oldState.termios)), 0, 0, 0); err != 0 { + return nil, err + } + + return &oldState, nil +} + +// Restore restores the terminal connected to the given file descriptor to a +// previous state. +func Restore(fd int, state *State) error { + if _, _, err := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), ioctlWriteTermios, uintptr(unsafe.Pointer(&state.termios)), 0, 0, 0); err != 0 { + return err + } + return nil +} + +// GetSize returns the dimensions of the given terminal. +func GetSize(fd int) (width, height int, err error) { + var dimensions [4]uint16 + + if _, _, err := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), uintptr(syscall.TIOCGWINSZ), uintptr(unsafe.Pointer(&dimensions)), 0, 0, 0); err != 0 { + return -1, -1, err + } + return int(dimensions[1]), int(dimensions[0]), nil +} + +// passwordReader is an io.Reader that reads from a specific file descriptor. +type passwordReader int + +func (r passwordReader) Read(buf []byte) (int, error) { + return syscall.Read(int(r), buf) +} + +// ReadPassword reads a line of input from a terminal without local echo. This +// is commonly used for inputting passwords and other sensitive data. The slice +// returned does not include the \n. +func ReadPassword(fd int) ([]byte, error) { + var oldState syscall.Termios + if _, _, err := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), ioctlReadTermios, uintptr(unsafe.Pointer(&oldState)), 0, 0, 0); err != 0 { + return nil, err + } + + newState := oldState + newState.Lflag &^= syscall.ECHO + newState.Lflag |= syscall.ICANON | syscall.ISIG + newState.Iflag |= syscall.ICRNL + if _, _, err := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), ioctlWriteTermios, uintptr(unsafe.Pointer(&newState)), 0, 0, 0); err != 0 { + return nil, err + } + + defer func() { + syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), ioctlWriteTermios, uintptr(unsafe.Pointer(&oldState)), 0, 0, 0) + }() + + return readPasswordLine(passwordReader(fd)) +} diff --git a/vendor/golang.org/x/crypto/ssh/terminal/util_bsd.go b/vendor/golang.org/x/crypto/ssh/terminal/util_bsd.go new file mode 100644 index 0000000..9c1ffd1 --- /dev/null +++ b/vendor/golang.org/x/crypto/ssh/terminal/util_bsd.go @@ -0,0 +1,12 @@ +// Copyright 2013 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// +build darwin dragonfly freebsd netbsd openbsd + +package terminal + +import "syscall" + +const ioctlReadTermios = syscall.TIOCGETA +const ioctlWriteTermios = syscall.TIOCSETA diff --git a/vendor/golang.org/x/crypto/ssh/terminal/util_linux.go b/vendor/golang.org/x/crypto/ssh/terminal/util_linux.go new file mode 100644 index 0000000..5883b22 --- /dev/null +++ b/vendor/golang.org/x/crypto/ssh/terminal/util_linux.go @@ -0,0 +1,11 @@ +// Copyright 2013 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package terminal + +// These constants are declared here, rather than importing +// them from the syscall package as some syscall packages, even +// on linux, for example gccgo, do not declare them. +const ioctlReadTermios = 0x5401 // syscall.TCGETS +const ioctlWriteTermios = 0x5402 // syscall.TCSETS diff --git a/vendor/golang.org/x/crypto/ssh/terminal/util_plan9.go b/vendor/golang.org/x/crypto/ssh/terminal/util_plan9.go new file mode 100644 index 0000000..799f049 --- /dev/null +++ b/vendor/golang.org/x/crypto/ssh/terminal/util_plan9.go @@ -0,0 +1,58 @@ +// Copyright 2016 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// Package terminal provides support functions for dealing with terminals, as +// commonly found on UNIX systems. +// +// Putting a terminal into raw mode is the most common requirement: +// +// oldState, err := terminal.MakeRaw(0) +// if err != nil { +// panic(err) +// } +// defer terminal.Restore(0, oldState) +package terminal + +import ( + "fmt" + "runtime" +) + +type State struct{} + +// IsTerminal returns true if the given file descriptor is a terminal. +func IsTerminal(fd int) bool { + return false +} + +// MakeRaw put the terminal connected to the given file descriptor into raw +// mode and returns the previous state of the terminal so that it can be +// restored. +func MakeRaw(fd int) (*State, error) { + return nil, fmt.Errorf("terminal: MakeRaw not implemented on %s/%s", runtime.GOOS, runtime.GOARCH) +} + +// GetState returns the current state of a terminal which may be useful to +// restore the terminal after a signal. +func GetState(fd int) (*State, error) { + return nil, fmt.Errorf("terminal: GetState not implemented on %s/%s", runtime.GOOS, runtime.GOARCH) +} + +// Restore restores the terminal connected to the given file descriptor to a +// previous state. +func Restore(fd int, state *State) error { + return fmt.Errorf("terminal: Restore not implemented on %s/%s", runtime.GOOS, runtime.GOARCH) +} + +// GetSize returns the dimensions of the given terminal. +func GetSize(fd int) (width, height int, err error) { + return 0, 0, fmt.Errorf("terminal: GetSize not implemented on %s/%s", runtime.GOOS, runtime.GOARCH) +} + +// ReadPassword reads a line of input from a terminal without local echo. This +// is commonly used for inputting passwords and other sensitive data. The slice +// returned does not include the \n. +func ReadPassword(fd int) ([]byte, error) { + return nil, fmt.Errorf("terminal: ReadPassword not implemented on %s/%s", runtime.GOOS, runtime.GOARCH) +} diff --git a/vendor/golang.org/x/crypto/ssh/terminal/util_solaris.go b/vendor/golang.org/x/crypto/ssh/terminal/util_solaris.go new file mode 100644 index 0000000..a2e1b57 --- /dev/null +++ b/vendor/golang.org/x/crypto/ssh/terminal/util_solaris.go @@ -0,0 +1,128 @@ +// Copyright 2015 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// +build solaris + +package terminal // import "golang.org/x/crypto/ssh/terminal" + +import ( + "golang.org/x/sys/unix" + "io" + "syscall" +) + +// State contains the state of a terminal. +type State struct { + state *unix.Termios +} + +// IsTerminal returns true if the given file descriptor is a terminal. +func IsTerminal(fd int) bool { + _, err := unix.IoctlGetTermio(fd, unix.TCGETA) + return err == nil +} + +// ReadPassword reads a line of input from a terminal without local echo. This +// is commonly used for inputting passwords and other sensitive data. The slice +// returned does not include the \n. +func ReadPassword(fd int) ([]byte, error) { + // see also: http://src.illumos.org/source/xref/illumos-gate/usr/src/lib/libast/common/uwin/getpass.c + val, err := unix.IoctlGetTermios(fd, unix.TCGETS) + if err != nil { + return nil, err + } + oldState := *val + + newState := oldState + newState.Lflag &^= syscall.ECHO + newState.Lflag |= syscall.ICANON | syscall.ISIG + newState.Iflag |= syscall.ICRNL + err = unix.IoctlSetTermios(fd, unix.TCSETS, &newState) + if err != nil { + return nil, err + } + + defer unix.IoctlSetTermios(fd, unix.TCSETS, &oldState) + + var buf [16]byte + var ret []byte + for { + n, err := syscall.Read(fd, buf[:]) + if err != nil { + return nil, err + } + if n == 0 { + if len(ret) == 0 { + return nil, io.EOF + } + break + } + if buf[n-1] == '\n' { + n-- + } + ret = append(ret, buf[:n]...) + if n < len(buf) { + break + } + } + + return ret, nil +} + +// MakeRaw puts the terminal connected to the given file descriptor into raw +// mode and returns the previous state of the terminal so that it can be +// restored. +// see http://cr.illumos.org/~webrev/andy_js/1060/ +func MakeRaw(fd int) (*State, error) { + oldTermiosPtr, err := unix.IoctlGetTermios(fd, unix.TCGETS) + if err != nil { + return nil, err + } + oldTermios := *oldTermiosPtr + + newTermios := oldTermios + newTermios.Iflag &^= syscall.IGNBRK | syscall.BRKINT | syscall.PARMRK | syscall.ISTRIP | syscall.INLCR | syscall.IGNCR | syscall.ICRNL | syscall.IXON + newTermios.Oflag &^= syscall.OPOST + newTermios.Lflag &^= syscall.ECHO | syscall.ECHONL | syscall.ICANON | syscall.ISIG | syscall.IEXTEN + newTermios.Cflag &^= syscall.CSIZE | syscall.PARENB + newTermios.Cflag |= syscall.CS8 + newTermios.Cc[unix.VMIN] = 1 + newTermios.Cc[unix.VTIME] = 0 + + if err := unix.IoctlSetTermios(fd, unix.TCSETS, &newTermios); err != nil { + return nil, err + } + + return &State{ + state: oldTermiosPtr, + }, nil +} + +// Restore restores the terminal connected to the given file descriptor to a +// previous state. +func Restore(fd int, oldState *State) error { + return unix.IoctlSetTermios(fd, unix.TCSETS, oldState.state) +} + +// GetState returns the current state of a terminal which may be useful to +// restore the terminal after a signal. +func GetState(fd int) (*State, error) { + oldTermiosPtr, err := unix.IoctlGetTermios(fd, unix.TCGETS) + if err != nil { + return nil, err + } + + return &State{ + state: oldTermiosPtr, + }, nil +} + +// GetSize returns the dimensions of the given terminal. +func GetSize(fd int) (width, height int, err error) { + ws, err := unix.IoctlGetWinsize(fd, unix.TIOCGWINSZ) + if err != nil { + return 0, 0, err + } + return int(ws.Col), int(ws.Row), nil +} diff --git a/vendor/golang.org/x/crypto/ssh/terminal/util_windows.go b/vendor/golang.org/x/crypto/ssh/terminal/util_windows.go new file mode 100644 index 0000000..e0a1f36 --- /dev/null +++ b/vendor/golang.org/x/crypto/ssh/terminal/util_windows.go @@ -0,0 +1,155 @@ +// Copyright 2011 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// +build windows + +// Package terminal provides support functions for dealing with terminals, as +// commonly found on UNIX systems. +// +// Putting a terminal into raw mode is the most common requirement: +// +// oldState, err := terminal.MakeRaw(0) +// if err != nil { +// panic(err) +// } +// defer terminal.Restore(0, oldState) +package terminal + +import ( + "syscall" + "unsafe" +) + +const ( + enableLineInput = 2 + enableEchoInput = 4 + enableProcessedInput = 1 + enableWindowInput = 8 + enableMouseInput = 16 + enableInsertMode = 32 + enableQuickEditMode = 64 + enableExtendedFlags = 128 + enableAutoPosition = 256 + enableProcessedOutput = 1 + enableWrapAtEolOutput = 2 +) + +var kernel32 = syscall.NewLazyDLL("kernel32.dll") + +var ( + procGetConsoleMode = kernel32.NewProc("GetConsoleMode") + procSetConsoleMode = kernel32.NewProc("SetConsoleMode") + procGetConsoleScreenBufferInfo = kernel32.NewProc("GetConsoleScreenBufferInfo") +) + +type ( + short int16 + word uint16 + + coord struct { + x short + y short + } + smallRect struct { + left short + top short + right short + bottom short + } + consoleScreenBufferInfo struct { + size coord + cursorPosition coord + attributes word + window smallRect + maximumWindowSize coord + } +) + +type State struct { + mode uint32 +} + +// IsTerminal returns true if the given file descriptor is a terminal. +func IsTerminal(fd int) bool { + var st uint32 + r, _, e := syscall.Syscall(procGetConsoleMode.Addr(), 2, uintptr(fd), uintptr(unsafe.Pointer(&st)), 0) + return r != 0 && e == 0 +} + +// MakeRaw put the terminal connected to the given file descriptor into raw +// mode and returns the previous state of the terminal so that it can be +// restored. +func MakeRaw(fd int) (*State, error) { + var st uint32 + _, _, e := syscall.Syscall(procGetConsoleMode.Addr(), 2, uintptr(fd), uintptr(unsafe.Pointer(&st)), 0) + if e != 0 { + return nil, error(e) + } + raw := st &^ (enableEchoInput | enableProcessedInput | enableLineInput | enableProcessedOutput) + _, _, e = syscall.Syscall(procSetConsoleMode.Addr(), 2, uintptr(fd), uintptr(raw), 0) + if e != 0 { + return nil, error(e) + } + return &State{st}, nil +} + +// GetState returns the current state of a terminal which may be useful to +// restore the terminal after a signal. +func GetState(fd int) (*State, error) { + var st uint32 + _, _, e := syscall.Syscall(procGetConsoleMode.Addr(), 2, uintptr(fd), uintptr(unsafe.Pointer(&st)), 0) + if e != 0 { + return nil, error(e) + } + return &State{st}, nil +} + +// Restore restores the terminal connected to the given file descriptor to a +// previous state. +func Restore(fd int, state *State) error { + _, _, err := syscall.Syscall(procSetConsoleMode.Addr(), 2, uintptr(fd), uintptr(state.mode), 0) + return err +} + +// GetSize returns the dimensions of the given terminal. +func GetSize(fd int) (width, height int, err error) { + var info consoleScreenBufferInfo + _, _, e := syscall.Syscall(procGetConsoleScreenBufferInfo.Addr(), 2, uintptr(fd), uintptr(unsafe.Pointer(&info)), 0) + if e != 0 { + return 0, 0, error(e) + } + return int(info.size.x), int(info.size.y), nil +} + +// passwordReader is an io.Reader that reads from a specific Windows HANDLE. +type passwordReader int + +func (r passwordReader) Read(buf []byte) (int, error) { + return syscall.Read(syscall.Handle(r), buf) +} + +// ReadPassword reads a line of input from a terminal without local echo. This +// is commonly used for inputting passwords and other sensitive data. The slice +// returned does not include the \n. +func ReadPassword(fd int) ([]byte, error) { + var st uint32 + _, _, e := syscall.Syscall(procGetConsoleMode.Addr(), 2, uintptr(fd), uintptr(unsafe.Pointer(&st)), 0) + if e != 0 { + return nil, error(e) + } + old := st + + st &^= (enableEchoInput) + st |= (enableProcessedInput | enableLineInput | enableProcessedOutput) + _, _, e = syscall.Syscall(procSetConsoleMode.Addr(), 2, uintptr(fd), uintptr(st), 0) + if e != 0 { + return nil, error(e) + } + + defer func() { + syscall.Syscall(procSetConsoleMode.Addr(), 2, uintptr(fd), uintptr(old), 0) + }() + + return readPasswordLine(passwordReader(fd)) +} diff --git a/vendor/golang.org/x/crypto/ssh/testdata_test.go b/vendor/golang.org/x/crypto/ssh/testdata_test.go new file mode 100644 index 0000000..2da8c79 --- /dev/null +++ b/vendor/golang.org/x/crypto/ssh/testdata_test.go @@ -0,0 +1,63 @@ +// Copyright 2014 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// IMPLEMENTATION NOTE: To avoid a package loop, this file is in three places: +// ssh/, ssh/agent, and ssh/test/. It should be kept in sync across all three +// instances. + +package ssh + +import ( + "crypto/rand" + "fmt" + + "golang.org/x/crypto/ssh/testdata" +) + +var ( + testPrivateKeys map[string]interface{} + testSigners map[string]Signer + testPublicKeys map[string]PublicKey +) + +func init() { + var err error + + n := len(testdata.PEMBytes) + testPrivateKeys = make(map[string]interface{}, n) + testSigners = make(map[string]Signer, n) + testPublicKeys = make(map[string]PublicKey, n) + for t, k := range testdata.PEMBytes { + testPrivateKeys[t], err = ParseRawPrivateKey(k) + if err != nil { + panic(fmt.Sprintf("Unable to parse test key %s: %v", t, err)) + } + testSigners[t], err = NewSignerFromKey(testPrivateKeys[t]) + if err != nil { + panic(fmt.Sprintf("Unable to create signer for test key %s: %v", t, err)) + } + testPublicKeys[t] = testSigners[t].PublicKey() + } + + // Create a cert and sign it for use in tests. + testCert := &Certificate{ + Nonce: []byte{}, // To pass reflect.DeepEqual after marshal & parse, this must be non-nil + ValidPrincipals: []string{"gopher1", "gopher2"}, // increases test coverage + ValidAfter: 0, // unix epoch + ValidBefore: CertTimeInfinity, // The end of currently representable time. + Reserved: []byte{}, // To pass reflect.DeepEqual after marshal & parse, this must be non-nil + Key: testPublicKeys["ecdsa"], + SignatureKey: testPublicKeys["rsa"], + Permissions: Permissions{ + CriticalOptions: map[string]string{}, + Extensions: map[string]string{}, + }, + } + testCert.SignCert(rand.Reader, testSigners["rsa"]) + testPrivateKeys["cert"] = testPrivateKeys["ecdsa"] + testSigners["cert"], err = NewCertSigner(testCert, testSigners["ecdsa"]) + if err != nil { + panic(fmt.Sprintf("Unable to create certificate signer: %v", err)) + } +} diff --git a/vendor/golang.org/x/crypto/ssh/transport.go b/vendor/golang.org/x/crypto/ssh/transport.go new file mode 100644 index 0000000..f9780e0 --- /dev/null +++ b/vendor/golang.org/x/crypto/ssh/transport.go @@ -0,0 +1,375 @@ +// Copyright 2011 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package ssh + +import ( + "bufio" + "errors" + "io" + "log" +) + +// debugTransport if set, will print packet types as they go over the +// wire. No message decoding is done, to minimize the impact on timing. +const debugTransport = false + +const ( + gcmCipherID = "aes128-gcm@openssh.com" + aes128cbcID = "aes128-cbc" + tripledescbcID = "3des-cbc" +) + +// packetConn represents a transport that implements packet based +// operations. +type packetConn interface { + // Encrypt and send a packet of data to the remote peer. + writePacket(packet []byte) error + + // Read a packet from the connection. The read is blocking, + // i.e. if error is nil, then the returned byte slice is + // always non-empty. + readPacket() ([]byte, error) + + // Close closes the write-side of the connection. + Close() error +} + +// transport is the keyingTransport that implements the SSH packet +// protocol. +type transport struct { + reader connectionState + writer connectionState + + bufReader *bufio.Reader + bufWriter *bufio.Writer + rand io.Reader + isClient bool + io.Closer +} + +// packetCipher represents a combination of SSH encryption/MAC +// protocol. A single instance should be used for one direction only. +type packetCipher interface { + // writePacket encrypts the packet and writes it to w. The + // contents of the packet are generally scrambled. + writePacket(seqnum uint32, w io.Writer, rand io.Reader, packet []byte) error + + // readPacket reads and decrypts a packet of data. The + // returned packet may be overwritten by future calls of + // readPacket. + readPacket(seqnum uint32, r io.Reader) ([]byte, error) +} + +// connectionState represents one side (read or write) of the +// connection. This is necessary because each direction has its own +// keys, and can even have its own algorithms +type connectionState struct { + packetCipher + seqNum uint32 + dir direction + pendingKeyChange chan packetCipher +} + +// prepareKeyChange sets up key material for a keychange. The key changes in +// both directions are triggered by reading and writing a msgNewKey packet +// respectively. +func (t *transport) prepareKeyChange(algs *algorithms, kexResult *kexResult) error { + if ciph, err := newPacketCipher(t.reader.dir, algs.r, kexResult); err != nil { + return err + } else { + t.reader.pendingKeyChange <- ciph + } + + if ciph, err := newPacketCipher(t.writer.dir, algs.w, kexResult); err != nil { + return err + } else { + t.writer.pendingKeyChange <- ciph + } + + return nil +} + +func (t *transport) printPacket(p []byte, write bool) { + if len(p) == 0 { + return + } + who := "server" + if t.isClient { + who = "client" + } + what := "read" + if write { + what = "write" + } + + log.Println(what, who, p[0]) +} + +// Read and decrypt next packet. +func (t *transport) readPacket() (p []byte, err error) { + for { + p, err = t.reader.readPacket(t.bufReader) + if err != nil { + break + } + if len(p) == 0 || (p[0] != msgIgnore && p[0] != msgDebug) { + break + } + } + if debugTransport { + t.printPacket(p, false) + } + + return p, err +} + +func (s *connectionState) readPacket(r *bufio.Reader) ([]byte, error) { + packet, err := s.packetCipher.readPacket(s.seqNum, r) + s.seqNum++ + if err == nil && len(packet) == 0 { + err = errors.New("ssh: zero length packet") + } + + if len(packet) > 0 { + switch packet[0] { + case msgNewKeys: + select { + case cipher := <-s.pendingKeyChange: + s.packetCipher = cipher + default: + return nil, errors.New("ssh: got bogus newkeys message.") + } + + case msgDisconnect: + // Transform a disconnect message into an + // error. Since this is lowest level at which + // we interpret message types, doing it here + // ensures that we don't have to handle it + // elsewhere. + var msg disconnectMsg + if err := Unmarshal(packet, &msg); err != nil { + return nil, err + } + return nil, &msg + } + } + + // The packet may point to an internal buffer, so copy the + // packet out here. + fresh := make([]byte, len(packet)) + copy(fresh, packet) + + return fresh, err +} + +func (t *transport) writePacket(packet []byte) error { + if debugTransport { + t.printPacket(packet, true) + } + return t.writer.writePacket(t.bufWriter, t.rand, packet) +} + +func (s *connectionState) writePacket(w *bufio.Writer, rand io.Reader, packet []byte) error { + changeKeys := len(packet) > 0 && packet[0] == msgNewKeys + + err := s.packetCipher.writePacket(s.seqNum, w, rand, packet) + if err != nil { + return err + } + if err = w.Flush(); err != nil { + return err + } + s.seqNum++ + if changeKeys { + select { + case cipher := <-s.pendingKeyChange: + s.packetCipher = cipher + default: + panic("ssh: no key material for msgNewKeys") + } + } + return err +} + +func newTransport(rwc io.ReadWriteCloser, rand io.Reader, isClient bool) *transport { + t := &transport{ + bufReader: bufio.NewReader(rwc), + bufWriter: bufio.NewWriter(rwc), + rand: rand, + reader: connectionState{ + packetCipher: &streamPacketCipher{cipher: noneCipher{}}, + pendingKeyChange: make(chan packetCipher, 1), + }, + writer: connectionState{ + packetCipher: &streamPacketCipher{cipher: noneCipher{}}, + pendingKeyChange: make(chan packetCipher, 1), + }, + Closer: rwc, + } + t.isClient = isClient + + if isClient { + t.reader.dir = serverKeys + t.writer.dir = clientKeys + } else { + t.reader.dir = clientKeys + t.writer.dir = serverKeys + } + + return t +} + +type direction struct { + ivTag []byte + keyTag []byte + macKeyTag []byte +} + +var ( + serverKeys = direction{[]byte{'B'}, []byte{'D'}, []byte{'F'}} + clientKeys = direction{[]byte{'A'}, []byte{'C'}, []byte{'E'}} +) + +// generateKeys generates key material for IV, MAC and encryption. +func generateKeys(d direction, algs directionAlgorithms, kex *kexResult) (iv, key, macKey []byte) { + cipherMode := cipherModes[algs.Cipher] + macMode := macModes[algs.MAC] + + iv = make([]byte, cipherMode.ivSize) + key = make([]byte, cipherMode.keySize) + macKey = make([]byte, macMode.keySize) + + generateKeyMaterial(iv, d.ivTag, kex) + generateKeyMaterial(key, d.keyTag, kex) + generateKeyMaterial(macKey, d.macKeyTag, kex) + return +} + +// setupKeys sets the cipher and MAC keys from kex.K, kex.H and sessionId, as +// described in RFC 4253, section 6.4. direction should either be serverKeys +// (to setup server->client keys) or clientKeys (for client->server keys). +func newPacketCipher(d direction, algs directionAlgorithms, kex *kexResult) (packetCipher, error) { + iv, key, macKey := generateKeys(d, algs, kex) + + if algs.Cipher == gcmCipherID { + return newGCMCipher(iv, key, macKey) + } + + if algs.Cipher == aes128cbcID { + return newAESCBCCipher(iv, key, macKey, algs) + } + + if algs.Cipher == tripledescbcID { + return newTripleDESCBCCipher(iv, key, macKey, algs) + } + + c := &streamPacketCipher{ + mac: macModes[algs.MAC].new(macKey), + etm: macModes[algs.MAC].etm, + } + c.macResult = make([]byte, c.mac.Size()) + + var err error + c.cipher, err = cipherModes[algs.Cipher].createStream(key, iv) + if err != nil { + return nil, err + } + + return c, nil +} + +// generateKeyMaterial fills out with key material generated from tag, K, H +// and sessionId, as specified in RFC 4253, section 7.2. +func generateKeyMaterial(out, tag []byte, r *kexResult) { + var digestsSoFar []byte + + h := r.Hash.New() + for len(out) > 0 { + h.Reset() + h.Write(r.K) + h.Write(r.H) + + if len(digestsSoFar) == 0 { + h.Write(tag) + h.Write(r.SessionID) + } else { + h.Write(digestsSoFar) + } + + digest := h.Sum(nil) + n := copy(out, digest) + out = out[n:] + if len(out) > 0 { + digestsSoFar = append(digestsSoFar, digest...) + } + } +} + +const packageVersion = "SSH-2.0-Go" + +// Sends and receives a version line. The versionLine string should +// be US ASCII, start with "SSH-2.0-", and should not include a +// newline. exchangeVersions returns the other side's version line. +func exchangeVersions(rw io.ReadWriter, versionLine []byte) (them []byte, err error) { + // Contrary to the RFC, we do not ignore lines that don't + // start with "SSH-2.0-" to make the library usable with + // nonconforming servers. + for _, c := range versionLine { + // The spec disallows non US-ASCII chars, and + // specifically forbids null chars. + if c < 32 { + return nil, errors.New("ssh: junk character in version line") + } + } + if _, err = rw.Write(append(versionLine, '\r', '\n')); err != nil { + return + } + + them, err = readVersion(rw) + return them, err +} + +// maxVersionStringBytes is the maximum number of bytes that we'll +// accept as a version string. RFC 4253 section 4.2 limits this at 255 +// chars +const maxVersionStringBytes = 255 + +// Read version string as specified by RFC 4253, section 4.2. +func readVersion(r io.Reader) ([]byte, error) { + versionString := make([]byte, 0, 64) + var ok bool + var buf [1]byte + + for len(versionString) < maxVersionStringBytes { + _, err := io.ReadFull(r, buf[:]) + if err != nil { + return nil, err + } + // The RFC says that the version should be terminated with \r\n + // but several SSH servers actually only send a \n. + if buf[0] == '\n' { + ok = true + break + } + + // non ASCII chars are disallowed, but we are lenient, + // since Go doesn't use null-terminated strings. + + // The RFC allows a comment after a space, however, + // all of it (version and comments) goes into the + // session hash. + versionString = append(versionString, buf[0]) + } + + if !ok { + return nil, errors.New("ssh: overflow reading version string") + } + + // There might be a '\r' on the end which we should remove. + if len(versionString) > 0 && versionString[len(versionString)-1] == '\r' { + versionString = versionString[:len(versionString)-1] + } + return versionString, nil +} diff --git a/vendor/golang.org/x/crypto/ssh/transport_test.go b/vendor/golang.org/x/crypto/ssh/transport_test.go new file mode 100644 index 0000000..92d83ab --- /dev/null +++ b/vendor/golang.org/x/crypto/ssh/transport_test.go @@ -0,0 +1,109 @@ +// Copyright 2011 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package ssh + +import ( + "bytes" + "crypto/rand" + "encoding/binary" + "strings" + "testing" +) + +func TestReadVersion(t *testing.T) { + longversion := strings.Repeat("SSH-2.0-bla", 50)[:253] + cases := map[string]string{ + "SSH-2.0-bla\r\n": "SSH-2.0-bla", + "SSH-2.0-bla\n": "SSH-2.0-bla", + longversion + "\r\n": longversion, + } + + for in, want := range cases { + result, err := readVersion(bytes.NewBufferString(in)) + if err != nil { + t.Errorf("readVersion(%q): %s", in, err) + } + got := string(result) + if got != want { + t.Errorf("got %q, want %q", got, want) + } + } +} + +func TestReadVersionError(t *testing.T) { + longversion := strings.Repeat("SSH-2.0-bla", 50)[:253] + cases := []string{ + longversion + "too-long\r\n", + } + for _, in := range cases { + if _, err := readVersion(bytes.NewBufferString(in)); err == nil { + t.Errorf("readVersion(%q) should have failed", in) + } + } +} + +func TestExchangeVersionsBasic(t *testing.T) { + v := "SSH-2.0-bla" + buf := bytes.NewBufferString(v + "\r\n") + them, err := exchangeVersions(buf, []byte("xyz")) + if err != nil { + t.Errorf("exchangeVersions: %v", err) + } + + if want := "SSH-2.0-bla"; string(them) != want { + t.Errorf("got %q want %q for our version", them, want) + } +} + +func TestExchangeVersions(t *testing.T) { + cases := []string{ + "not\x000allowed", + "not allowed\n", + } + for _, c := range cases { + buf := bytes.NewBufferString("SSH-2.0-bla\r\n") + if _, err := exchangeVersions(buf, []byte(c)); err == nil { + t.Errorf("exchangeVersions(%q): should have failed", c) + } + } +} + +type closerBuffer struct { + bytes.Buffer +} + +func (b *closerBuffer) Close() error { + return nil +} + +func TestTransportMaxPacketWrite(t *testing.T) { + buf := &closerBuffer{} + tr := newTransport(buf, rand.Reader, true) + huge := make([]byte, maxPacket+1) + err := tr.writePacket(huge) + if err == nil { + t.Errorf("transport accepted write for a huge packet.") + } +} + +func TestTransportMaxPacketReader(t *testing.T) { + var header [5]byte + huge := make([]byte, maxPacket+128) + binary.BigEndian.PutUint32(header[0:], uint32(len(huge))) + // padding. + header[4] = 0 + + buf := &closerBuffer{} + buf.Write(header[:]) + buf.Write(huge) + + tr := newTransport(buf, rand.Reader, true) + _, err := tr.readPacket() + if err == nil { + t.Errorf("transport succeeded reading huge packet.") + } else if !strings.Contains(err.Error(), "large") { + t.Errorf("got %q, should mention %q", err.Error(), "large") + } +} -- cgit v1.2.3