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/ssh/handshake_test.go | 559 +++++++++++++++++++++++ 1 file changed, 559 insertions(+) create mode 100644 vendor/golang.org/x/crypto/ssh/handshake_test.go (limited to 'vendor/golang.org/x/crypto/ssh/handshake_test.go') 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) + } +} -- cgit v1.2.3