diff --git a/vendor/golang.org/x/crypto/curve25519/const_amd64.h b/vendor/golang.org/x/crypto/curve25519/const_amd64.h new file mode 100644 index 000000000..b3f74162f --- /dev/null +++ b/vendor/golang.org/x/crypto/curve25519/const_amd64.h @@ -0,0 +1,8 @@ +// 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. + +// This code was translated into a form compatible with 6a from the public +// domain sources in SUPERCOP: https://bench.cr.yp.to/supercop.html + +#define REDMASK51 0x0007FFFFFFFFFFFF diff --git a/vendor/golang.org/x/crypto/curve25519/const_amd64.s b/vendor/golang.org/x/crypto/curve25519/const_amd64.s index 797f9b051..ee7b4bd5f 100644 --- a/vendor/golang.org/x/crypto/curve25519/const_amd64.s +++ b/vendor/golang.org/x/crypto/curve25519/const_amd64.s @@ -3,12 +3,12 @@ // license that can be found in the LICENSE file. // This code was translated into a form compatible with 6a from the public -// domain sources in SUPERCOP: http://bench.cr.yp.to/supercop.html +// domain sources in SUPERCOP: https://bench.cr.yp.to/supercop.html // +build amd64,!gccgo,!appengine -DATA ·REDMASK51(SB)/8, $0x0007FFFFFFFFFFFF -GLOBL ·REDMASK51(SB), 8, $8 +// These constants cannot be encoded in non-MOVQ immediates. +// We access them directly from memory instead. DATA ·_121666_213(SB)/8, $996687872 GLOBL ·_121666_213(SB), 8, $8 diff --git a/vendor/golang.org/x/crypto/curve25519/cswap_amd64.s b/vendor/golang.org/x/crypto/curve25519/cswap_amd64.s index 45484d1b5..cd793a5b5 100644 --- a/vendor/golang.org/x/crypto/curve25519/cswap_amd64.s +++ b/vendor/golang.org/x/crypto/curve25519/cswap_amd64.s @@ -2,87 +2,64 @@ // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. -// This code was translated into a form compatible with 6a from the public -// domain sources in SUPERCOP: http://bench.cr.yp.to/supercop.html - // +build amd64,!gccgo,!appengine -// func cswap(inout *[5]uint64, v uint64) +// func cswap(inout *[4][5]uint64, v uint64) TEXT ·cswap(SB),7,$0 MOVQ inout+0(FP),DI MOVQ v+8(FP),SI - CMPQ SI,$1 - MOVQ 0(DI),SI - MOVQ 80(DI),DX - MOVQ 8(DI),CX - MOVQ 88(DI),R8 - MOVQ SI,R9 - CMOVQEQ DX,SI - CMOVQEQ R9,DX - MOVQ CX,R9 - CMOVQEQ R8,CX - CMOVQEQ R9,R8 - MOVQ SI,0(DI) - MOVQ DX,80(DI) - MOVQ CX,8(DI) - MOVQ R8,88(DI) - MOVQ 16(DI),SI - MOVQ 96(DI),DX - MOVQ 24(DI),CX - MOVQ 104(DI),R8 - MOVQ SI,R9 - CMOVQEQ DX,SI - CMOVQEQ R9,DX - MOVQ CX,R9 - CMOVQEQ R8,CX - CMOVQEQ R9,R8 - MOVQ SI,16(DI) - MOVQ DX,96(DI) - MOVQ CX,24(DI) - MOVQ R8,104(DI) - MOVQ 32(DI),SI - MOVQ 112(DI),DX - MOVQ 40(DI),CX - MOVQ 120(DI),R8 - MOVQ SI,R9 - CMOVQEQ DX,SI - CMOVQEQ R9,DX - MOVQ CX,R9 - CMOVQEQ R8,CX - CMOVQEQ R9,R8 - MOVQ SI,32(DI) - MOVQ DX,112(DI) - MOVQ CX,40(DI) - MOVQ R8,120(DI) - MOVQ 48(DI),SI - MOVQ 128(DI),DX - MOVQ 56(DI),CX - MOVQ 136(DI),R8 - MOVQ SI,R9 - CMOVQEQ DX,SI - CMOVQEQ R9,DX - MOVQ CX,R9 - CMOVQEQ R8,CX - CMOVQEQ R9,R8 - MOVQ SI,48(DI) - MOVQ DX,128(DI) - MOVQ CX,56(DI) - MOVQ R8,136(DI) - MOVQ 64(DI),SI - MOVQ 144(DI),DX - MOVQ 72(DI),CX - MOVQ 152(DI),R8 - MOVQ SI,R9 - CMOVQEQ DX,SI - CMOVQEQ R9,DX - MOVQ CX,R9 - CMOVQEQ R8,CX - CMOVQEQ R9,R8 - MOVQ SI,64(DI) - MOVQ DX,144(DI) - MOVQ CX,72(DI) - MOVQ R8,152(DI) - MOVQ DI,AX - MOVQ SI,DX + SUBQ $1, SI + NOTQ SI + MOVQ SI, X15 + PSHUFD $0x44, X15, X15 + + MOVOU 0(DI), X0 + MOVOU 16(DI), X2 + MOVOU 32(DI), X4 + MOVOU 48(DI), X6 + MOVOU 64(DI), X8 + MOVOU 80(DI), X1 + MOVOU 96(DI), X3 + MOVOU 112(DI), X5 + MOVOU 128(DI), X7 + MOVOU 144(DI), X9 + + MOVO X1, X10 + MOVO X3, X11 + MOVO X5, X12 + MOVO X7, X13 + MOVO X9, X14 + + PXOR X0, X10 + PXOR X2, X11 + PXOR X4, X12 + PXOR X6, X13 + PXOR X8, X14 + PAND X15, X10 + PAND X15, X11 + PAND X15, X12 + PAND X15, X13 + PAND X15, X14 + PXOR X10, X0 + PXOR X10, X1 + PXOR X11, X2 + PXOR X11, X3 + PXOR X12, X4 + PXOR X12, X5 + PXOR X13, X6 + PXOR X13, X7 + PXOR X14, X8 + PXOR X14, X9 + + MOVOU X0, 0(DI) + MOVOU X2, 16(DI) + MOVOU X4, 32(DI) + MOVOU X6, 48(DI) + MOVOU X8, 64(DI) + MOVOU X1, 80(DI) + MOVOU X3, 96(DI) + MOVOU X5, 112(DI) + MOVOU X7, 128(DI) + MOVOU X9, 144(DI) RET diff --git a/vendor/golang.org/x/crypto/curve25519/curve25519.go b/vendor/golang.org/x/crypto/curve25519/curve25519.go index 6918c47fc..cb8fbc57b 100644 --- a/vendor/golang.org/x/crypto/curve25519/curve25519.go +++ b/vendor/golang.org/x/crypto/curve25519/curve25519.go @@ -2,12 +2,16 @@ // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. -// We have a implementation in amd64 assembly so this code is only run on +// We have an implementation in amd64 assembly so this code is only run on // non-amd64 platforms. The amd64 assembly does not support gccgo. // +build !amd64 gccgo appengine package curve25519 +import ( + "encoding/binary" +) + // This code is a port of the public domain, "ref10" implementation of // curve25519 from SUPERCOP 20130419 by D. J. Bernstein. @@ -50,17 +54,11 @@ func feCopy(dst, src *fieldElement) { // // Preconditions: b in {0,1}. func feCSwap(f, g *fieldElement, b int32) { - var x fieldElement b = -b - for i := range x { - x[i] = b & (f[i] ^ g[i]) - } - for i := range f { - f[i] ^= x[i] - } - for i := range g { - g[i] ^= x[i] + t := b & (f[i] ^ g[i]) + f[i] ^= t + g[i] ^= t } } @@ -75,12 +73,7 @@ func load3(in []byte) int64 { // load4 reads a 32-bit, little-endian value from in. 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 + return int64(binary.LittleEndian.Uint32(in)) } func feFromBytes(dst *fieldElement, src *[32]byte) { diff --git a/vendor/golang.org/x/crypto/curve25519/doc.go b/vendor/golang.org/x/crypto/curve25519/doc.go index ebeea3c2d..da9b10d9c 100644 --- a/vendor/golang.org/x/crypto/curve25519/doc.go +++ b/vendor/golang.org/x/crypto/curve25519/doc.go @@ -3,7 +3,7 @@ // license that can be found in the LICENSE file. // Package curve25519 provides an implementation of scalar multiplication on -// the elliptic curve known as curve25519. See http://cr.yp.to/ecdh.html +// the elliptic curve known as curve25519. See https://cr.yp.to/ecdh.html package curve25519 // import "golang.org/x/crypto/curve25519" // basePoint is the x coordinate of the generator of the curve. diff --git a/vendor/golang.org/x/crypto/curve25519/freeze_amd64.s b/vendor/golang.org/x/crypto/curve25519/freeze_amd64.s index 932800b8d..390816106 100644 --- a/vendor/golang.org/x/crypto/curve25519/freeze_amd64.s +++ b/vendor/golang.org/x/crypto/curve25519/freeze_amd64.s @@ -3,10 +3,12 @@ // license that can be found in the LICENSE file. // This code was translated into a form compatible with 6a from the public -// domain sources in SUPERCOP: http://bench.cr.yp.to/supercop.html +// domain sources in SUPERCOP: https://bench.cr.yp.to/supercop.html // +build amd64,!gccgo,!appengine +#include "const_amd64.h" + // func freeze(inout *[5]uint64) TEXT ·freeze(SB),7,$0-8 MOVQ inout+0(FP), DI @@ -16,7 +18,7 @@ TEXT ·freeze(SB),7,$0-8 MOVQ 16(DI),CX MOVQ 24(DI),R8 MOVQ 32(DI),R9 - MOVQ ·REDMASK51(SB),AX + MOVQ $REDMASK51,AX MOVQ AX,R10 SUBQ $18,R10 MOVQ $3,R11 diff --git a/vendor/golang.org/x/crypto/curve25519/ladderstep_amd64.s b/vendor/golang.org/x/crypto/curve25519/ladderstep_amd64.s index ee7b36c36..9e9040b25 100644 --- a/vendor/golang.org/x/crypto/curve25519/ladderstep_amd64.s +++ b/vendor/golang.org/x/crypto/curve25519/ladderstep_amd64.s @@ -3,10 +3,12 @@ // license that can be found in the LICENSE file. // This code was translated into a form compatible with 6a from the public -// domain sources in SUPERCOP: http://bench.cr.yp.to/supercop.html +// domain sources in SUPERCOP: https://bench.cr.yp.to/supercop.html // +build amd64,!gccgo,!appengine +#include "const_amd64.h" + // func ladderstep(inout *[5][5]uint64) TEXT ·ladderstep(SB),0,$296-8 MOVQ inout+0(FP),DI @@ -118,7 +120,7 @@ TEXT ·ladderstep(SB),0,$296-8 MULQ 72(SP) ADDQ AX,R12 ADCQ DX,R13 - MOVQ ·REDMASK51(SB),DX + MOVQ $REDMASK51,DX SHLQ $13,CX:SI ANDQ DX,SI SHLQ $13,R9:R8 @@ -233,7 +235,7 @@ TEXT ·ladderstep(SB),0,$296-8 MULQ 32(SP) ADDQ AX,R12 ADCQ DX,R13 - MOVQ ·REDMASK51(SB),DX + MOVQ $REDMASK51,DX SHLQ $13,CX:SI ANDQ DX,SI SHLQ $13,R9:R8 @@ -438,7 +440,7 @@ TEXT ·ladderstep(SB),0,$296-8 MULQ 72(SP) ADDQ AX,R12 ADCQ DX,R13 - MOVQ ·REDMASK51(SB),DX + MOVQ $REDMASK51,DX SHLQ $13,CX:SI ANDQ DX,SI SHLQ $13,R9:R8 @@ -588,7 +590,7 @@ TEXT ·ladderstep(SB),0,$296-8 MULQ 32(SP) ADDQ AX,R12 ADCQ DX,R13 - MOVQ ·REDMASK51(SB),DX + MOVQ $REDMASK51,DX SHLQ $13,CX:SI ANDQ DX,SI SHLQ $13,R9:R8 @@ -728,7 +730,7 @@ TEXT ·ladderstep(SB),0,$296-8 MULQ 152(DI) ADDQ AX,R12 ADCQ DX,R13 - MOVQ ·REDMASK51(SB),DX + MOVQ $REDMASK51,DX SHLQ $13,CX:SI ANDQ DX,SI SHLQ $13,R9:R8 @@ -843,7 +845,7 @@ TEXT ·ladderstep(SB),0,$296-8 MULQ 192(DI) ADDQ AX,R12 ADCQ DX,R13 - MOVQ ·REDMASK51(SB),DX + MOVQ $REDMASK51,DX SHLQ $13,CX:SI ANDQ DX,SI SHLQ $13,R9:R8 @@ -993,7 +995,7 @@ TEXT ·ladderstep(SB),0,$296-8 MULQ 32(DI) ADDQ AX,R12 ADCQ DX,R13 - MOVQ ·REDMASK51(SB),DX + MOVQ $REDMASK51,DX SHLQ $13,CX:SI ANDQ DX,SI SHLQ $13,R9:R8 @@ -1143,7 +1145,7 @@ TEXT ·ladderstep(SB),0,$296-8 MULQ 112(SP) ADDQ AX,R12 ADCQ DX,R13 - MOVQ ·REDMASK51(SB),DX + MOVQ $REDMASK51,DX SHLQ $13,CX:SI ANDQ DX,SI SHLQ $13,R9:R8 @@ -1329,7 +1331,7 @@ TEXT ·ladderstep(SB),0,$296-8 MULQ 192(SP) ADDQ AX,R12 ADCQ DX,R13 - MOVQ ·REDMASK51(SB),DX + MOVQ $REDMASK51,DX SHLQ $13,CX:SI ANDQ DX,SI SHLQ $13,R9:R8 diff --git a/vendor/golang.org/x/crypto/curve25519/mul_amd64.s b/vendor/golang.org/x/crypto/curve25519/mul_amd64.s index 33ce57dcd..5ce80a2e5 100644 --- a/vendor/golang.org/x/crypto/curve25519/mul_amd64.s +++ b/vendor/golang.org/x/crypto/curve25519/mul_amd64.s @@ -3,10 +3,12 @@ // license that can be found in the LICENSE file. // This code was translated into a form compatible with 6a from the public -// domain sources in SUPERCOP: http://bench.cr.yp.to/supercop.html +// domain sources in SUPERCOP: https://bench.cr.yp.to/supercop.html // +build amd64,!gccgo,!appengine +#include "const_amd64.h" + // func mul(dest, a, b *[5]uint64) TEXT ·mul(SB),0,$16-24 MOVQ dest+0(FP), DI @@ -121,7 +123,7 @@ TEXT ·mul(SB),0,$16-24 MULQ 32(CX) ADDQ AX,R14 ADCQ DX,R15 - MOVQ ·REDMASK51(SB),SI + MOVQ $REDMASK51,SI SHLQ $13,R9:R8 ANDQ SI,R8 SHLQ $13,R11:R10 diff --git a/vendor/golang.org/x/crypto/curve25519/square_amd64.s b/vendor/golang.org/x/crypto/curve25519/square_amd64.s index 3a92804dd..12f73734f 100644 --- a/vendor/golang.org/x/crypto/curve25519/square_amd64.s +++ b/vendor/golang.org/x/crypto/curve25519/square_amd64.s @@ -3,10 +3,12 @@ // license that can be found in the LICENSE file. // This code was translated into a form compatible with 6a from the public -// domain sources in SUPERCOP: http://bench.cr.yp.to/supercop.html +// domain sources in SUPERCOP: https://bench.cr.yp.to/supercop.html // +build amd64,!gccgo,!appengine +#include "const_amd64.h" + // func square(out, in *[5]uint64) TEXT ·square(SB),7,$0-16 MOVQ out+0(FP), DI @@ -84,7 +86,7 @@ TEXT ·square(SB),7,$0-16 MULQ 32(SI) ADDQ AX,R13 ADCQ DX,R14 - MOVQ ·REDMASK51(SB),SI + MOVQ $REDMASK51,SI SHLQ $13,R8:CX ANDQ SI,CX SHLQ $13,R10:R9 diff --git a/vendor/golang.org/x/crypto/ed25519/ed25519.go b/vendor/golang.org/x/crypto/ed25519/ed25519.go index f1d95674a..4f26b49b6 100644 --- a/vendor/golang.org/x/crypto/ed25519/ed25519.go +++ b/vendor/golang.org/x/crypto/ed25519/ed25519.go @@ -3,20 +3,20 @@ // license that can be found in the LICENSE file. // Package ed25519 implements the Ed25519 signature algorithm. See -// http://ed25519.cr.yp.to/. +// 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. +// RFC 8032. package ed25519 // This code is a port of the public domain, “ref10” implementation of ed25519 // from SUPERCOP. import ( + "bytes" "crypto" cryptorand "crypto/rand" "crypto/sha512" - "crypto/subtle" "errors" "io" "strconv" @@ -177,5 +177,5 @@ func Verify(publicKey PublicKey, message, sig []byte) bool { var checkR [32]byte R.ToBytes(&checkR) - return subtle.ConstantTimeCompare(sig[:32], checkR[:]) == 1 + return bytes.Equal(sig[:32], checkR[:]) } diff --git a/vendor/golang.org/x/crypto/ssh/buffer.go b/vendor/golang.org/x/crypto/ssh/buffer.go index 6931b5114..1ab07d078 100644 --- a/vendor/golang.org/x/crypto/ssh/buffer.go +++ b/vendor/golang.org/x/crypto/ssh/buffer.go @@ -51,13 +51,12 @@ func (b *buffer) write(buf []byte) { } // eof closes the buffer. Reads from the buffer once all -// the data has been consumed will receive os.EOF. -func (b *buffer) eof() error { +// the data has been consumed will receive io.EOF. +func (b *buffer) eof() { 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 diff --git a/vendor/golang.org/x/crypto/ssh/certs.go b/vendor/golang.org/x/crypto/ssh/certs.go index 6331c94d5..b1f022078 100644 --- a/vendor/golang.org/x/crypto/ssh/certs.go +++ b/vendor/golang.org/x/crypto/ssh/certs.go @@ -251,10 +251,18 @@ type CertChecker struct { // for user certificates. SupportedCriticalOptions []string - // IsAuthority should return true if the key is recognized as - // an authority. This allows for certificates to be signed by other - // certificates. - IsAuthority func(auth PublicKey) bool + // 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. @@ -268,7 +276,7 @@ type CertChecker struct { // 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 func(addr string, remote net.Addr, key PublicKey) error + HostKeyFallback HostKeyCallback // IsRevoked is called for each certificate so that revocation checking // can be implemented. It should return true if the given certificate @@ -290,8 +298,17 @@ func (c *CertChecker) CheckHostKey(addr string, remote net.Addr, key PublicKey) 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) + } - return c.CheckCert(addr, cert) + 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 @@ -308,6 +325,9 @@ func (c *CertChecker) Authenticate(conn ConnMetadata, pubKey PublicKey) (*Permis 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 @@ -356,10 +376,6 @@ func (c *CertChecker) CheckCert(principal string, cert *Certificate) error { } } - if !c.IsAuthority(cert.SignatureKey) { - return fmt.Errorf("ssh: certificate signed by unrecognized authority") - } - clock := c.Clock if clock == nil { clock = time.Now diff --git a/vendor/golang.org/x/crypto/ssh/channel.go b/vendor/golang.org/x/crypto/ssh/channel.go index 6d709b50b..195530ea0 100644 --- a/vendor/golang.org/x/crypto/ssh/channel.go +++ b/vendor/golang.org/x/crypto/ssh/channel.go @@ -461,8 +461,8 @@ func (m *mux) newChannel(chanType string, direction channelDirection, extraData pending: newBuffer(), extPending: newBuffer(), direction: direction, - incomingRequests: make(chan *Request, 16), - msg: make(chan interface{}, 16), + incomingRequests: make(chan *Request, chanSize), + msg: make(chan interface{}, chanSize), chanType: chanType, extraData: extraData, mux: m, diff --git a/vendor/golang.org/x/crypto/ssh/cipher.go b/vendor/golang.org/x/crypto/ssh/cipher.go index 34d3917c4..aed2b1f01 100644 --- a/vendor/golang.org/x/crypto/ssh/cipher.go +++ b/vendor/golang.org/x/crypto/ssh/cipher.go @@ -135,6 +135,7 @@ const prefixLen = 5 type streamPacketCipher struct { mac hash.Hash cipher cipher.Stream + etm bool // The following members are to avoid per-packet allocations. prefix [prefixLen]byte @@ -150,7 +151,14 @@ func (s *streamPacketCipher) readPacket(seqNum uint32, r io.Reader) ([]byte, err return nil, err } - s.cipher.XORKeyStream(s.prefix[:], s.prefix[:]) + 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]) @@ -159,7 +167,12 @@ func (s *streamPacketCipher) readPacket(seqNum uint32, r io.Reader) ([]byte, err s.mac.Reset() binary.BigEndian.PutUint32(s.seqNumBytes[:], seqNum) s.mac.Write(s.seqNumBytes[:]) - s.mac.Write(s.prefix[:]) + if s.etm { + s.mac.Write(s.prefix[:4]) + s.mac.Write(encryptedPaddingLength[:]) + } else { + s.mac.Write(s.prefix[:]) + } macSize = uint32(s.mac.Size()) } @@ -184,10 +197,17 @@ func (s *streamPacketCipher) readPacket(seqNum uint32, r io.Reader) ([]byte, 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 { - s.mac.Write(data) + 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") @@ -203,7 +223,13 @@ func (s *streamPacketCipher) writePacket(seqNum uint32, w io.Writer, rand io.Rea return errors.New("ssh: packet too large") } - paddingLength := packetSizeMultiple - (prefixLen+len(packet))%packetSizeMultiple + 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 } @@ -220,15 +246,37 @@ func (s *streamPacketCipher) writePacket(seqNum uint32, w io.Writer, rand io.Rea 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) } - s.cipher.XORKeyStream(s.prefix[:], s.prefix[:]) - s.cipher.XORKeyStream(packet, packet) - s.cipher.XORKeyStream(padding, padding) - if _, err := w.Write(s.prefix[:]); err != nil { return err } @@ -256,7 +304,7 @@ type gcmCipher struct { buf []byte } -func newGCMCipher(iv, key, macKey []byte) (packetCipher, error) { +func newGCMCipher(iv, key []byte) (packetCipher, error) { c, err := aes.NewCipher(key) if err != nil { return nil, err @@ -344,7 +392,9 @@ func (c *gcmCipher) readPacket(seqNum uint32, r io.Reader) ([]byte, error) { c.incIV() padding := plain[0] - if padding < 4 || padding >= 20 { + 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) } diff --git a/vendor/golang.org/x/crypto/ssh/client.go b/vendor/golang.org/x/crypto/ssh/client.go index 0212a20c9..6fd199455 100644 --- a/vendor/golang.org/x/crypto/ssh/client.go +++ b/vendor/golang.org/x/crypto/ssh/client.go @@ -5,15 +5,17 @@ package ssh import ( + "bytes" "errors" "fmt" "net" + "os" "sync" "time" ) // Client implements a traditional SSH client that supports shells, -// subprocesses, port forwarding and tunneled dialing. +// subprocesses, TCP port/streamlocal forwarding and tunneled dialing. type Client struct { Conn @@ -40,7 +42,7 @@ func (c *Client) HandleChannelOpen(channelType string) <-chan NewChannel { return nil } - ch = make(chan NewChannel, 16) + ch = make(chan NewChannel, chanSize) c.channelHandlers[channelType] = ch return ch } @@ -59,6 +61,7 @@ func NewClient(c Conn, chans <-chan NewChannel, reqs <-chan *Request) *Client { conn.forwards.closeAll() }() go conn.forwards.handleChannels(conn.HandleChannelOpen("forwarded-tcpip")) + go conn.forwards.handleChannels(conn.HandleChannelOpen("forwarded-streamlocal@openssh.com")) return conn } @@ -68,6 +71,11 @@ func NewClient(c Conn, chans <-chan NewChannel, reqs <-chan *Request) *Client { 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}, } @@ -97,13 +105,11 @@ func (c *connection) clientHandshake(dialAddress string, config *ClientConfig) e 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.requestInitialKeyChange(); err != nil { + if err := c.transport.waitSession(); err != nil { return err } - // We just did the key change, so the session ID is established. c.sessionID = c.transport.getSessionID() - return c.clientAuthenticate(config) } @@ -175,6 +181,17 @@ func Dial(network, addr string, config *ClientConfig) (*Client, error) { 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 + +// BannerCallback is the function type used for treat the banner sent by +// the server. A BannerCallback receives the message sent by the remote server. +type BannerCallback func(message string) 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 { @@ -190,10 +207,18 @@ type ClientConfig struct { // be used during authentication. Auth []AuthMethod - // HostKeyCallback, if not nil, is called during the cryptographic - // handshake to validate the server's host key. A nil HostKeyCallback - // implies that all host keys are accepted. - HostKeyCallback func(hostname string, remote net.Addr, key PublicKey) error + // 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 + + // BannerCallback is called during the SSH dance to display a custom + // server's message. The client configuration can supply this callback to + // handle it as wished. The function BannerDisplayStderr can be used for + // simplistic display on Stderr. + BannerCallback BannerCallback // ClientVersion contains the version identification string that will // be used for the connection. If empty, a reasonable default is used. @@ -211,3 +236,43 @@ type ClientConfig struct { // 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 +} + +// BannerDisplayStderr returns a function that can be used for +// ClientConfig.BannerCallback to display banners on os.Stderr. +func BannerDisplayStderr() BannerCallback { + return func(banner string) error { + _, err := os.Stderr.WriteString(banner) + + return err + } +} diff --git a/vendor/golang.org/x/crypto/ssh/client_auth.go b/vendor/golang.org/x/crypto/ssh/client_auth.go index 294af0d48..a1252cb9b 100644 --- a/vendor/golang.org/x/crypto/ssh/client_auth.go +++ b/vendor/golang.org/x/crypto/ssh/client_auth.go @@ -30,8 +30,10 @@ func (c *connection) clientAuthenticate(config *ClientConfig) error { // 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(c.transport.getSessionID(), config.User, c.transport, config.Rand) + ok, methods, err := auth.auth(sessionID, config.User, c.transport, config.Rand) if err != nil { return err } @@ -177,31 +179,26 @@ func (cb publicKeyCallback) method() string { } func (cb publicKeyCallback) auth(session []byte, user string, c packetConn, rand io.Reader) (bool, []string, error) { - // Authentication is performed in two stages. The first stage sends an - // enquiry to test if each key is acceptable to the remote. The second - // stage attempts to authenticate with the valid keys obtained in the - // first stage. + // 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 validKeys []Signer - for _, signer := range signers { - if ok, err := validateKey(signer.PublicKey(), user, c); ok { - validKeys = append(validKeys, signer) - } else { - if err != nil { - return false, nil, err - } - } - } - - // methods that may continue if this auth is not successful. var methods []string - for _, signer := range validKeys { - pub := signer.PublicKey() + 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, @@ -234,13 +231,29 @@ func (cb publicKeyCallback) auth(session []byte, user string, c packetConn, rand if err != nil { return false, nil, err } - if success { + + // 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() @@ -270,7 +283,9 @@ func confirmKeyAck(key PublicKey, c packetConn) (bool, error) { } switch packet[0] { case msgUserAuthBanner: - // TODO(gpaul): add callback to present the banner to the user + if err := handleBannerResponse(c, packet); err != nil { + return false, err + } case msgUserAuthPubKeyOk: var msg userAuthPubKeyOkMsg if err := Unmarshal(packet, &msg); err != nil { @@ -312,7 +327,9 @@ func handleAuthResponse(c packetConn) (bool, []string, error) { switch packet[0] { case msgUserAuthBanner: - // TODO: add callback to present the banner to the user + if err := handleBannerResponse(c, packet); err != nil { + return false, nil, err + } case msgUserAuthFailure: var msg userAuthFailureMsg if err := Unmarshal(packet, &msg); err != nil { @@ -327,6 +344,24 @@ func handleAuthResponse(c packetConn) (bool, []string, error) { } } +func handleBannerResponse(c packetConn, packet []byte) error { + var msg userAuthBannerMsg + if err := Unmarshal(packet, &msg); err != nil { + return err + } + + transport, ok := c.(*handshakeTransport) + if !ok { + return nil + } + + if transport.bannerCallback != nil { + return transport.bannerCallback(msg.Message) + } + + return nil +} + // 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 @@ -336,7 +371,7 @@ func handleAuthResponse(c packetConn) (bool, []string, error) { // 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 +// KeyboardInteractive returns an AuthMethod using a prompt/response // sequence controlled by the server. func KeyboardInteractive(challenge KeyboardInteractiveChallenge) AuthMethod { return challenge @@ -372,7 +407,9 @@ func (cb KeyboardInteractiveChallenge) auth(session []byte, user string, c packe // like handleAuthResponse, but with less options. switch packet[0] { case msgUserAuthBanner: - // TODO: Print banners during userauth. + if err := handleBannerResponse(c, packet); err != nil { + return false, nil, err + } continue case msgUserAuthInfoRequest: // OK diff --git a/vendor/golang.org/x/crypto/ssh/common.go b/vendor/golang.org/x/crypto/ssh/common.go index 2c72ab544..dc39e4d23 100644 --- a/vendor/golang.org/x/crypto/ssh/common.go +++ b/vendor/golang.org/x/crypto/ssh/common.go @@ -9,6 +9,7 @@ import ( "crypto/rand" "fmt" "io" + "math" "sync" _ "crypto/sha1" @@ -40,7 +41,7 @@ var supportedKexAlgos = []string{ kexAlgoDH14SHA1, kexAlgoDH1SHA1, } -// supportedKexAlgos specifies the supported host-key algorithms (i.e. methods +// supportedHostKeyAlgos specifies the supported host-key algorithms (i.e. methods // of authenticating servers) in preference order. var supportedHostKeyAlgos = []string{ CertAlgoRSAv01, CertAlgoDSAv01, CertAlgoECDSA256v01, @@ -56,7 +57,7 @@ var supportedHostKeyAlgos = []string{ // 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", "hmac-sha1", "hmac-sha1-96", + "hmac-sha2-256-etm@openssh.com", "hmac-sha2-256", "hmac-sha1", "hmac-sha1-96", } var supportedCompressions = []string{compressionNone} @@ -104,6 +105,21 @@ type directionAlgorithms struct { 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 @@ -171,7 +187,7 @@ type Config struct { // The maximum number of bytes sent or received after which a // new key is negotiated. It must be at least 256. If - // unspecified, 1 gigabyte is used. + // unspecified, a size suitable for the chosen cipher is used. RekeyThreshold uint64 // The allowed key exchanges algorithms. If unspecified then a @@ -215,11 +231,12 @@ func (c *Config) SetDefaults() { } if c.RekeyThreshold == 0 { - // RFC 4253, section 9 suggests rekeying after 1G. - c.RekeyThreshold = 1 << 30 - } - if c.RekeyThreshold < minRekeyThreshold { + // 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 } } diff --git a/vendor/golang.org/x/crypto/ssh/connection.go b/vendor/golang.org/x/crypto/ssh/connection.go index e786f2f9a..fd6b0681b 100644 --- a/vendor/golang.org/x/crypto/ssh/connection.go +++ b/vendor/golang.org/x/crypto/ssh/connection.go @@ -25,7 +25,7 @@ type ConnMetadata interface { // User returns the user ID for this connection. User() string - // SessionID returns the sesson hash, also denoted by H. + // SessionID returns the session hash, also denoted by H. SessionID() []byte // ClientVersion returns the client's version string as hashed diff --git a/vendor/golang.org/x/crypto/ssh/doc.go b/vendor/golang.org/x/crypto/ssh/doc.go index d6be89466..67b7322c0 100644 --- a/vendor/golang.org/x/crypto/ssh/doc.go +++ b/vendor/golang.org/x/crypto/ssh/doc.go @@ -14,5 +14,8 @@ 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/handshake.go b/vendor/golang.org/x/crypto/ssh/handshake.go index 37d42e47f..4f7912ecd 100644 --- a/vendor/golang.org/x/crypto/ssh/handshake.go +++ b/vendor/golang.org/x/crypto/ssh/handshake.go @@ -19,6 +19,11 @@ import ( // 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. @@ -53,34 +58,65 @@ type handshakeTransport struct { 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 func(hostname string, remote net.Addr, key PublicKey) error + hostKeyCallback HostKeyCallback dialAddress string remoteAddr net.Addr - readSinceKex uint64 + // bannerCallback is non-empty if we are the client and it has been set in + // ClientConfig. In that case it is called during the user authentication + // dance to handle a custom server's message. + bannerCallback BannerCallback - // Protects the writing side of the connection - mu sync.Mutex - cond *sync.Cond - sentInitPacket []byte - sentInitMsg *kexInitMsg - writtenSinceKex uint64 - writeError error + // 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, 16), - config: config, + incoming: make(chan []byte, chanSize), + requestKex: make(chan struct{}, 1), + startKex: make(chan *pendingKex, 1), + + config: config, } - t.cond = sync.NewCond(&t.mu) + t.resetReadThresholds() + t.resetWriteThresholds() + + // We always start with a mandatory key exchange. + t.requestKex <- struct{}{} return t } @@ -89,12 +125,14 @@ func newClientTransport(conn keyingTransport, clientVersion, serverVersion []byt t.dialAddress = dialAddr t.remoteAddr = addr t.hostKeyCallback = config.HostKeyCallback + t.bannerCallback = config.BannerCallback if config.HostKeyAlgorithms != nil { t.hostKeyAlgorithms = config.HostKeyAlgorithms } else { t.hostKeyAlgorithms = supportedHostKeyAlgos } go t.readLoop() + go t.kexLoop() return t } @@ -102,6 +140,7 @@ func newServerTransport(conn keyingTransport, clientVersion, serverVersion []byt t := newHandshakeTransport(conn, &config.Config, clientVersion, serverVersion) t.hostKeys = config.hostKeys go t.readLoop() + go t.kexLoop() return t } @@ -109,6 +148,20 @@ 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" @@ -116,6 +169,20 @@ func (t *handshakeTransport) id() string { 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 { @@ -125,8 +192,10 @@ func (t *handshakeTransport) readPacket() ([]byte, error) { } func (t *handshakeTransport) readLoop() { + first := true for { - p, err := t.readOnePacket() + p, err := t.readOnePacket(first) + first = false if err != nil { t.readError = err close(t.incoming) @@ -138,67 +207,217 @@ func (t *handshakeTransport) readLoop() { t.incoming <- p } - // If we can't read, declare the writing part dead too. - t.mu.Lock() - defer t.mu.Unlock() - if t.writeError == nil { - t.writeError = t.readError - } - t.cond.Broadcast() + // 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) readOnePacket() ([]byte, error) { - if t.readSinceKex > t.config.RekeyThreshold { - if err := t.requestKeyChange(); err != nil { - return nil, err +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 } - t.readSinceKex += uint64(len(p)) - if debugHandshake { - if p[0] == msgChannelData || p[0] == msgChannelExtendedData { - log.Printf("%s got data (packet %d bytes)", t.id(), len(p)) - } else { - msg, err := decode(p) - log.Printf("%s got %T %v (%v)", t.id(), msg, msg, 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 } - t.mu.Lock() - firstKex := t.sessionID == nil - err = t.enterKeyExchangeLocked(p) - if err != nil { - // drop connection - t.conn.Close() - t.writeError = err + 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) } - // Unblock writers. - t.sentInitMsg = nil - t.sentInitPacket = nil - t.cond.Broadcast() - t.writtenSinceKex = 0 - t.mu.Unlock() - if err != nil { return nil, err } - t.readSinceKex = 0 + t.resetReadThresholds() // By default, a key exchange is hidden from higher layers by // translating it into msgIgnore. @@ -213,61 +432,16 @@ func (t *handshakeTransport) readOnePacket() ([]byte, error) { return successPacket, nil } -// keyChangeCategory describes whether a key exchange is the first on a -// connection, or a subsequent one. -type keyChangeCategory bool - -const ( - firstKeyExchange keyChangeCategory = true - subsequentKeyExchange keyChangeCategory = false -) - -// sendKexInit sends a key change message, and returns the message -// that was sent. After initiating the key change, all writes will be -// blocked until the change is done, and a failed key change will -// close the underlying transport. This function is safe for -// concurrent use by multiple goroutines. -func (t *handshakeTransport) sendKexInit(isFirst keyChangeCategory) error { - var err error - +// sendKexInit sends a key change message. +func (t *handshakeTransport) sendKexInit() error { t.mu.Lock() - // If this is the initial key change, but we already have a sessionID, - // then do nothing because the key exchange has already completed - // asynchronously. - if !isFirst || t.sessionID == nil { - _, _, err = t.sendKexInitLocked(isFirst) - } - t.mu.Unlock() - if err != nil { - return err - } - if isFirst { - if packet, err := t.readPacket(); err != nil { - return err - } else if packet[0] != msgNewKeys { - return unexpectedMessageError(msgNewKeys, packet[0]) - } - } - return nil -} - -func (t *handshakeTransport) requestInitialKeyChange() error { - return t.sendKexInit(firstKeyExchange) -} - -func (t *handshakeTransport) requestKeyChange() error { - return t.sendKexInit(subsequentKeyExchange) -} - -// sendKexInitLocked sends a key change message. t.mu must be locked -// while this happens. -func (t *handshakeTransport) sendKexInitLocked(isFirst keyChangeCategory) (*kexInitMsg, []byte, error) { - // 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. + defer t.mu.Unlock() if t.sentInitMsg != nil { - return t.sentInitMsg, t.sentInitPacket, 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{ @@ -295,53 +469,65 @@ func (t *handshakeTransport) sendKexInitLocked(isFirst keyChangeCategory) (*kexI packetCopy := make([]byte, len(packet)) copy(packetCopy, packet) - if err := t.conn.writePacket(packetCopy); err != nil { - return nil, nil, err + if err := t.pushPacket(packetCopy); err != nil { + return err } t.sentInitMsg = msg t.sentInitPacket = packet - return msg, packet, nil + + return nil } func (t *handshakeTransport) writePacket(p []byte) error { - t.mu.Lock() - defer t.mu.Unlock() - - if t.writtenSinceKex > t.config.RekeyThreshold { - t.sendKexInitLocked(subsequentKeyExchange) - } - for t.sentInitMsg != nil && t.writeError == nil { - t.cond.Wait() - } - if t.writeError != nil { - return t.writeError - } - t.writtenSinceKex += uint64(len(p)) - 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") - default: - return t.conn.writePacket(p) } + + 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() } -// enterKeyExchange runs the key exchange. t.mu must be held while running this. -func (t *handshakeTransport) enterKeyExchangeLocked(otherInitPacket []byte) error { +func (t *handshakeTransport) enterKeyExchange(otherInitPacket []byte) error { if debugHandshake { log.Printf("%s entered key exchange", t.id()) } - myInit, myInitPacket, err := t.sendKexInitLocked(subsequentKeyExchange) - if err != nil { - return err - } otherInit := &kexInitMsg{} if err := Unmarshal(otherInitPacket, otherInit); err != nil { @@ -352,20 +538,20 @@ func (t *handshakeTransport) enterKeyExchangeLocked(otherInitPacket []byte) erro clientVersion: t.clientVersion, serverVersion: t.serverVersion, clientKexInit: otherInitPacket, - serverKexInit: myInitPacket, + serverKexInit: t.sentInitPacket, } clientInit := otherInit - serverInit := myInit + serverInit := t.sentInitMsg if len(t.hostKeys) == 0 { - clientInit = myInit - serverInit = otherInit + clientInit, serverInit = serverInit, clientInit - magics.clientKexInit = myInitPacket + magics.clientKexInit = t.sentInitPacket magics.serverKexInit = otherInitPacket } - algs, err := findAgreedAlgorithms(clientInit, serverInit) + var err error + t.algorithms, err = findAgreedAlgorithms(clientInit, serverInit) if err != nil { return err } @@ -388,16 +574,16 @@ func (t *handshakeTransport) enterKeyExchangeLocked(otherInitPacket []byte) erro } } - kex, ok := kexAlgoMap[algs.kex] + kex, ok := kexAlgoMap[t.algorithms.kex] if !ok { - return fmt.Errorf("ssh: unexpected key exchange algorithm %v", algs.kex) + 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, algs, &magics) + result, err = t.server(kex, t.algorithms, &magics) } else { - result, err = t.client(kex, algs, &magics) + result, err = t.client(kex, t.algorithms, &magics) } if err != nil { @@ -409,7 +595,9 @@ func (t *handshakeTransport) enterKeyExchangeLocked(otherInitPacket []byte) erro } result.SessionID = t.sessionID - t.conn.prepareKeyChange(algs, result) + if err := t.conn.prepareKeyChange(t.algorithms, result); err != nil { + return err + } if err = t.conn.writePacket([]byte{msgNewKeys}); err != nil { return err } @@ -449,11 +637,9 @@ func (t *handshakeTransport) client(kex kexAlgorithm, algs *algorithms, magics * return nil, err } - if t.hostKeyCallback != nil { - err = t.hostKeyCallback(t.dialAddress, t.remoteAddr, hostKey) - if 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/kex.go b/vendor/golang.org/x/crypto/ssh/kex.go index c87fbebfd..f91c2770e 100644 --- a/vendor/golang.org/x/crypto/ssh/kex.go +++ b/vendor/golang.org/x/crypto/ssh/kex.go @@ -383,8 +383,8 @@ func init() { // 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, + g: new(big.Int).SetInt64(2), + p: p, pMinus1: new(big.Int).Sub(p, bigOne), } @@ -393,8 +393,8 @@ func init() { p, _ = new(big.Int).SetString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kexAlgoMap[kexAlgoDH14SHA1] = &dhGroup{ - g: new(big.Int).SetInt64(2), - p: p, + g: new(big.Int).SetInt64(2), + p: p, pMinus1: new(big.Int).Sub(p, bigOne), } diff --git a/vendor/golang.org/x/crypto/ssh/keys.go b/vendor/golang.org/x/crypto/ssh/keys.go index f2fc9b6c9..b682c1741 100644 --- a/vendor/golang.org/x/crypto/ssh/keys.go +++ b/vendor/golang.org/x/crypto/ssh/keys.go @@ -10,10 +10,13 @@ import ( "crypto/dsa" "crypto/ecdsa" "crypto/elliptic" + "crypto/md5" "crypto/rsa" + "crypto/sha256" "crypto/x509" "encoding/asn1" "encoding/base64" + "encoding/hex" "encoding/pem" "errors" "fmt" @@ -364,6 +367,17 @@ func (r *dsaPublicKey) Type() string { return "ssh-dss" } +func checkDSAParams(param *dsa.Parameters) error { + // SSH specifies FIPS 186-2, which only provided a single size + // (1024 bits) DSA key. FIPS 186-3 allows for larger key + // sizes, which would confuse SSH. + if l := param.P.BitLen(); l != 1024 { + return fmt.Errorf("ssh: unsupported DSA key size %d", l) + } + + return nil +} + // 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 { @@ -374,13 +388,18 @@ func parseDSA(in []byte) (out PublicKey, rest []byte, err error) { return nil, nil, err } + param := dsa.Parameters{ + P: w.P, + Q: w.Q, + G: w.G, + } + if err := checkDSAParams(¶m); err != nil { + return nil, nil, err + } + key := &dsaPublicKey{ - Parameters: dsa.Parameters{ - P: w.P, - Q: w.Q, - G: w.G, - }, - Y: w.Y, + Parameters: param, + Y: w.Y, } return key, w.Rest, nil } @@ -627,19 +646,28 @@ func (k *ecdsaPublicKey) CryptoPublicKey() crypto.PublicKey { } // 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. +// *ecdsa.PrivateKey or any other crypto.Signer and returns a +// corresponding Signer instance. ECDSA keys must use P-256, P-384 or +// P-521. DSA keys must use parameter size L1024N160. func NewSignerFromKey(key interface{}) (Signer, error) { switch key := key.(type) { case crypto.Signer: return NewSignerFromSigner(key) case *dsa.PrivateKey: - return &dsaPrivateKey{key}, nil + return newDSAPrivateKey(key) default: return nil, fmt.Errorf("ssh: unsupported key type %T", key) } } +func newDSAPrivateKey(key *dsa.PrivateKey) (Signer, error) { + if err := checkDSAParams(&key.PublicKey.Parameters); err != nil { + return nil, err + } + + return &dsaPrivateKey{key}, nil +} + type wrappedSigner struct { signer crypto.Signer pubKey PublicKey @@ -753,6 +781,18 @@ func ParsePrivateKey(pemBytes []byte) (Signer, error) { 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 @@ -787,6 +827,43 @@ func ParseRawPrivateKey(pemBytes []byte) (interface{}, error) { } } +// 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) { @@ -795,8 +872,8 @@ func ParseDSAPrivateKey(der []byte) (*dsa.PrivateKey, error) { P *big.Int Q *big.Int G *big.Int - Priv *big.Int Pub *big.Int + Priv *big.Int } rest, err := asn1.Unmarshal(der, &k) if err != nil { @@ -813,15 +890,15 @@ func ParseDSAPrivateKey(der []byte) (*dsa.PrivateKey, error) { Q: k.Q, G: k.G, }, - Y: k.Priv, + Y: k.Pub, }, - X: 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) (*ed25519.PrivateKey, error) { +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") @@ -841,14 +918,15 @@ func parseOpenSSHPrivateKey(key []byte) (*ed25519.PrivateKey, error) { 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 - Pub []byte - Priv []byte - Comment string - Pad []byte `ssh:"rest"` + Rest []byte `ssh:"rest"` }{} if err := Unmarshal(w.PrivKeyBlock, &pk1); err != nil { @@ -859,22 +937,95 @@ func parseOpenSSHPrivateKey(key []byte) (*ed25519.PrivateKey, error) { return nil, errors.New("ssh: checkint mismatch") } - // we only handle ed25519 keys currently - if pk1.Keytype != KeyAlgoED25519 { + // 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") } - - for i, b := range pk1.Pad { - if int(b) != i+1 { - return nil, errors.New("ssh: padding not as expected") - } - } - - if len(pk1.Priv) != ed25519.PrivateKeySize { - return nil, errors.New("ssh: private key unexpected length") - } - - pk := ed25519.PrivateKey(make([]byte, ed25519.PrivateKeySize)) - copy(pk, pk1.Priv) - return &pk, nil +} + +// 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/mac.go b/vendor/golang.org/x/crypto/ssh/mac.go index 07744ad67..c07a06285 100644 --- a/vendor/golang.org/x/crypto/ssh/mac.go +++ b/vendor/golang.org/x/crypto/ssh/mac.go @@ -15,6 +15,7 @@ import ( type macMode struct { keySize int + etm bool new func(key []byte) hash.Hash } @@ -45,13 +46,16 @@ func (t truncatingMAC) Size() int { func (t truncatingMAC) BlockSize() int { return t.hmac.BlockSize() } var macModes = map[string]*macMode{ - "hmac-sha2-256": {32, func(key []byte) hash.Hash { + "hmac-sha2-256-etm@openssh.com": {32, true, func(key []byte) hash.Hash { return hmac.New(sha256.New, key) }}, - "hmac-sha1": {20, func(key []byte) hash.Hash { + "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, func(key []byte) hash.Hash { + "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/messages.go b/vendor/golang.org/x/crypto/ssh/messages.go index e6ecd3afa..c96e1bec5 100644 --- a/vendor/golang.org/x/crypto/ssh/messages.go +++ b/vendor/golang.org/x/crypto/ssh/messages.go @@ -23,10 +23,6 @@ const ( msgUnimplemented = 3 msgDebug = 4 msgNewKeys = 21 - - // Standard authentication messages - msgUserAuthSuccess = 52 - msgUserAuthBanner = 53 ) // SSH messages: @@ -137,6 +133,18 @@ type userAuthFailureMsg struct { PartialSuccess bool } +// See RFC 4252, section 5.1 +const msgUserAuthSuccess = 52 + +// See RFC 4252, section 5.4 +const msgUserAuthBanner = 53 + +type userAuthBannerMsg struct { + Message string `sshtype:"53"` + // unused, but required to allow message parsing + Language string +} + // See RFC 4256, section 3.2 const msgUserAuthInfoRequest = 60 const msgUserAuthInfoResponse = 61 diff --git a/vendor/golang.org/x/crypto/ssh/mux.go b/vendor/golang.org/x/crypto/ssh/mux.go index f3a3ddd78..27a527c10 100644 --- a/vendor/golang.org/x/crypto/ssh/mux.go +++ b/vendor/golang.org/x/crypto/ssh/mux.go @@ -116,9 +116,9 @@ func (m *mux) Wait() error { func newMux(p packetConn) *mux { m := &mux{ conn: p, - incomingChannels: make(chan NewChannel, 16), + incomingChannels: make(chan NewChannel, chanSize), globalResponses: make(chan interface{}, 1), - incomingRequests: make(chan *Request, 16), + incomingRequests: make(chan *Request, chanSize), errCond: newCond(), } if debugMux { diff --git a/vendor/golang.org/x/crypto/ssh/server.go b/vendor/golang.org/x/crypto/ssh/server.go index 37df1b302..148d2cb24 100644 --- a/vendor/golang.org/x/crypto/ssh/server.go +++ b/vendor/golang.org/x/crypto/ssh/server.go @@ -10,26 +10,38 @@ import ( "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. Permissions, except for "source-address", must be enforced in -// the server application layer, after successful authentication. The -// Permissions are passed on in ServerConn so a server implementation -// can honor them. +// 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 { - // Critical options restrict default permissions. Common - // restrictions are "source-address" and "force-command". If - // the server cannot enforce the restriction, or does not - // recognize it, the user should not authenticate. + // 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. Common extensions are - // "permit-agent-forwarding", "permit-X11-forwarding". Lack of - // support for an extension does not preclude authenticating a - // user. + // 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 } @@ -44,13 +56,24 @@ type ServerConfig struct { // 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 attempts public - // key authentication. It must return true if the given public key is - // valid for the given user. For example, see CertChecker.Authenticate. + // PublicKeyCallback, if non-nil, is called when a client + // offers a public key for authentication. It must return a nil error + // 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 @@ -72,6 +95,10 @@ type ServerConfig struct { // Note that RFC 4253 section 4.2 requires that this string start with // "SSH-2.0-". ServerVersion string + + // BannerCallback, if present, is called and the return string is sent to + // the client after key exchange completed but before authentication. + BannerCallback func(conn ConnMetadata) string } // AddHostKey adds a private key as a host key. If an existing host @@ -142,6 +169,10 @@ type ServerConn struct { 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}, } @@ -188,7 +219,7 @@ func (s *connection) serverHandshake(config *ServerConfig) (*Permissions, error) tr := newTransport(s.sshConn.conn, config.Rand, false /* not client */) s.transport = newServerTransport(tr, s.clientVersion, s.serverVersion, config) - if err := s.transport.requestInitialKeyChange(); err != nil { + if err := s.transport.waitSession(); err != nil { return nil, err } @@ -231,7 +262,7 @@ func isAcceptableAlgo(algo string) bool { return false } -func checkSourceAddress(addr net.Addr, sourceAddr string) error { +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") } @@ -241,33 +272,71 @@ func checkSourceAddress(addr net.Addr, sourceAddr string) error { return fmt.Errorf("ssh: remote address %v is not an TCP address when checking source-address match", addr) } - if allowedIP := net.ParseIP(sourceAddr); allowedIP != nil { - if bytes.Equal(allowedIP, 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) - } + 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 + 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) { - var err 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 @@ -278,6 +347,19 @@ userAuthLoop: } s.user = userAuthReq.User + + if authFailures == 0 && config.BannerCallback != nil { + msg := config.BannerCallback(s) + if msg != "" { + bannerMsg := &userAuthBannerMsg{ + Message: msg, + } + if err := s.transport.writePacket(Marshal(bannerMsg)); err != nil { + return nil, err + } + } + } + perms = nil authErr := errors.New("no auth passed yet") @@ -286,6 +368,11 @@ userAuthLoop: 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") @@ -357,6 +444,7 @@ userAuthLoop: if isQuery { // The client can query if the given public key // would be okay. + if len(payload) > 0 { return nil, parseError(msgUserAuthRequest) } @@ -385,7 +473,7 @@ userAuthLoop: if !isAcceptableAlgo(sig.Format) { break } - signedData := buildDataSignedForAuth(s.transport.getSessionID(), userAuthReq, algoBytes, pubKeyData) + signedData := buildDataSignedForAuth(sessionID, userAuthReq, algoBytes, pubKeyData) if err := pubKey.Verify(signedData, sig); err != nil { return nil, err @@ -398,6 +486,8 @@ userAuthLoop: authErr = fmt.Errorf("ssh: unknown method %q", userAuthReq.Method) } + authErrs = append(authErrs, authErr) + if config.AuthLogCallback != nil { config.AuthLogCallback(s, userAuthReq.Method, authErr) } @@ -406,6 +496,8 @@ userAuthLoop: break userAuthLoop } + authFailures++ + var failureMsg userAuthFailureMsg if config.PasswordCallback != nil { failureMsg.Methods = append(failureMsg.Methods, "password") @@ -421,12 +513,12 @@ userAuthLoop: return nil, errors.New("ssh: no authentication methods configured but NoClientAuth is also false") } - if err = s.transport.writePacket(Marshal(&failureMsg)); err != nil { + if err := s.transport.writePacket(Marshal(&failureMsg)); err != nil { return nil, err } } - if err = s.transport.writePacket([]byte{msgUserAuthSuccess}); err != nil { + if err := s.transport.writePacket([]byte{msgUserAuthSuccess}); err != nil { return nil, err } return perms, nil diff --git a/vendor/golang.org/x/crypto/ssh/session.go b/vendor/golang.org/x/crypto/ssh/session.go index 17e2aa85c..cc06e03f5 100644 --- a/vendor/golang.org/x/crypto/ssh/session.go +++ b/vendor/golang.org/x/crypto/ssh/session.go @@ -231,6 +231,26 @@ func (s *Session) RequestSubsystem(subsystem string) error { return err } +// RFC 4254 Section 6.7. +type ptyWindowChangeMsg struct { + Columns uint32 + Rows uint32 + Width uint32 + Height uint32 +} + +// WindowChange informs the remote host about a terminal window dimension change to h rows and w columns. +func (s *Session) WindowChange(h, w int) error { + req := ptyWindowChangeMsg{ + Columns: uint32(w), + Rows: uint32(h), + Width: uint32(w * 8), + Height: uint32(h * 8), + } + _, err := s.ch.SendRequest("window-change", false, Marshal(&req)) + return err +} + // RFC 4254 Section 6.9. type signalMsg struct { Signal string 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 000000000..a2dccc64c --- /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 index 6151241ff..acf17175d 100644 --- a/vendor/golang.org/x/crypto/ssh/tcpip.go +++ b/vendor/golang.org/x/crypto/ssh/tcpip.go @@ -20,12 +20,20 @@ import ( // 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) { - laddr, err := net.ResolveTCPAddr(n, addr) - if err != nil { - return nil, err + 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) } - return c.ListenTCP(laddr) } // Automatic port allocation is broken with OpenSSH before 6.0. See @@ -116,7 +124,7 @@ func (c *Client) ListenTCP(laddr *net.TCPAddr) (net.Listener, error) { } // Register this forward, using the port number we obtained. - ch := c.forwards.add(*laddr) + ch := c.forwards.add(laddr) return &tcpListener{laddr, c, ch}, nil } @@ -131,7 +139,7 @@ type forwardList struct { // 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.TCPAddr + laddr net.Addr c chan forward } @@ -139,16 +147,16 @@ type forwardEntry struct { // 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.TCPAddr // the raddr of the incoming connection + newCh NewChannel // the ssh client channel underlying this forward + raddr net.Addr // the raddr of the incoming connection } -func (l *forwardList) add(addr net.TCPAddr) chan forward { +func (l *forwardList) add(addr net.Addr) chan forward { l.Lock() defer l.Unlock() f := forwardEntry{ - addr, - make(chan forward, 1), + laddr: addr, + c: make(chan forward, 1), } l.entries = append(l.entries, f) return f.c @@ -176,44 +184,69 @@ func parseTCPAddr(addr string, port uint32) (*net.TCPAddr, error) { func (l *forwardList) handleChannels(in <-chan NewChannel) { for ch := range in { - var payload forwardedTCPPayload - if err := Unmarshal(ch.ExtraData(), &payload); err != nil { - ch.Reject(ConnectionFailed, "could not parse forwarded-tcpip payload: "+err.Error()) - continue - } + 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 - } + // 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 + } - if ok := l.forward(*laddr, *raddr, ch); !ok { + 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.TCPAddr) { +func (l *forwardList) remove(addr net.Addr) { l.Lock() defer l.Unlock() for i, f := range l.entries { - if addr.IP.Equal(f.laddr.IP) && addr.Port == f.laddr.Port { + 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 @@ -231,12 +264,12 @@ func (l *forwardList) closeAll() { l.entries = nil } -func (l *forwardList) forward(laddr, raddr net.TCPAddr, ch NewChannel) bool { +func (l *forwardList) forward(laddr, raddr net.Addr, ch NewChannel) bool { l.Lock() defer l.Unlock() for _, f := range l.entries { - if laddr.IP.Equal(f.laddr.IP) && laddr.Port == f.laddr.Port { - f.c <- forward{ch, &raddr} + if laddr.Network() == f.laddr.Network() && laddr.String() == f.laddr.String() { + f.c <- forward{newCh: ch, raddr: raddr} return true } } @@ -262,7 +295,7 @@ func (l *tcpListener) Accept() (net.Conn, error) { } go DiscardRequests(incoming) - return &tcpChanConn{ + return &chanConn{ Channel: ch, laddr: l.laddr, raddr: s.raddr, @@ -277,7 +310,7 @@ func (l *tcpListener) Close() error { } // this also closes the listener. - l.conn.forwards.remove(*l.laddr) + 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") @@ -293,29 +326,52 @@ func (l *tcpListener) Addr() net.Addr { // 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) { - // Parse the address into host and numeric port. - host, portString, err := net.SplitHostPort(addr) - if err != nil { - return nil, err + 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) } - port, err := strconv.ParseUint(portString, 10, 16) - if err != nil { - return nil, err - } - // Use a zero address for local and remote address. - zeroAddr := &net.TCPAddr{ - IP: net.IPv4zero, - Port: 0, - } - ch, err := c.dial(net.IPv4zero.String(), 0, host, int(port)) - if err != nil { - return nil, err - } - return &tcpChanConn{ - Channel: ch, - laddr: zeroAddr, - raddr: zeroAddr, - }, nil } // DialTCP connects to the remote address raddr on the network net, @@ -332,7 +388,7 @@ func (c *Client) DialTCP(n string, laddr, raddr *net.TCPAddr) (net.Conn, error) if err != nil { return nil, err } - return &tcpChanConn{ + return &chanConn{ Channel: ch, laddr: laddr, raddr: raddr, @@ -366,26 +422,26 @@ type tcpChan struct { Channel // the backing channel } -// tcpChanConn fulfills the net.Conn interface without +// chanConn fulfills the net.Conn interface without // the tcpChan having to hold laddr or raddr directly. -type tcpChanConn struct { +type chanConn struct { Channel laddr, raddr net.Addr } // LocalAddr returns the local network address. -func (t *tcpChanConn) LocalAddr() net.Addr { +func (t *chanConn) LocalAddr() net.Addr { return t.laddr } // RemoteAddr returns the remote network address. -func (t *tcpChanConn) RemoteAddr() net.Addr { +func (t *chanConn) RemoteAddr() net.Addr { return t.raddr } // SetDeadline sets the read and write deadlines associated // with the connection. -func (t *tcpChanConn) SetDeadline(deadline time.Time) error { +func (t *chanConn) SetDeadline(deadline time.Time) error { if err := t.SetReadDeadline(deadline); err != nil { return err } @@ -396,12 +452,14 @@ func (t *tcpChanConn) SetDeadline(deadline time.Time) error { // 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 *tcpChanConn) SetReadDeadline(deadline time.Time) error { +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 *tcpChanConn) SetWriteDeadline(deadline time.Time) 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/transport.go b/vendor/golang.org/x/crypto/ssh/transport.go index 62fba629e..ab2b88765 100644 --- a/vendor/golang.org/x/crypto/ssh/transport.go +++ b/vendor/golang.org/x/crypto/ssh/transport.go @@ -8,8 +8,13 @@ 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" @@ -22,7 +27,9 @@ type packetConn interface { // Encrypt and send a packet of data to the remote peer. writePacket(packet []byte) error - // Read a packet from the connection + // 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. @@ -38,7 +45,7 @@ type transport struct { bufReader *bufio.Reader bufWriter *bufio.Writer rand io.Reader - + isClient bool io.Closer } @@ -84,9 +91,38 @@ func (t *transport) prepareKeyChange(algs *algorithms, kexResult *kexResult) err 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() ([]byte, error) { - return t.reader.readPacket(t.bufReader) +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) { @@ -129,6 +165,9 @@ func (s *connectionState) readPacket(r *bufio.Reader) ([]byte, error) { } func (t *transport) writePacket(packet []byte) error { + if debugTransport { + t.printPacket(packet, true) + } return t.writer.writePacket(t.bufWriter, t.rand, packet) } @@ -169,6 +208,8 @@ func newTransport(rwc io.ReadWriteCloser, rand io.Reader, isClient bool) *transp }, Closer: rwc, } + t.isClient = isClient + if isClient { t.reader.dir = serverKeys t.writer.dir = clientKeys @@ -213,7 +254,7 @@ func newPacketCipher(d direction, algs directionAlgorithms, kex *kexResult) (pac iv, key, macKey := generateKeys(d, algs, kex) if algs.Cipher == gcmCipherID { - return newGCMCipher(iv, key, macKey) + return newGCMCipher(iv, key) } if algs.Cipher == aes128cbcID { @@ -226,6 +267,7 @@ func newPacketCipher(d direction, algs directionAlgorithms, kex *kexResult) (pac c := &streamPacketCipher{ mac: macModes[algs.MAC].new(macKey), + etm: macModes[algs.MAC].etm, } c.macResult = make([]byte, c.mac.Size()) diff --git a/vendor/vendor.json b/vendor/vendor.json index a26f1f8d4..b5bc882ec 100644 --- a/vendor/vendor.json +++ b/vendor/vendor.json @@ -1279,40 +1279,40 @@ "revisionTime": "2016-09-14T08:04:27Z" }, { - "checksumSHA1": "dwOedwBJ1EIK9+S3t108Bx054Y8=", + "checksumSHA1": "IQkUIOnvlf0tYloFx9mLaXSvXWQ=", "path": "golang.org/x/crypto/curve25519", - "revision": "9477e0b78b9ac3d0b03822fd95422e2fe07627cd", - "revisionTime": "2016-10-31T15:37:30Z" + "revision": "9f005a07e0d31d45e6656d241bb5c0f2efd4bc94", + "revisionTime": "2017-09-21T17:41:56Z" }, { - "checksumSHA1": "wGb//LjBPNxYHqk+dcLo7BjPXK8=", + "checksumSHA1": "1hwn8cgg4EVXhCpJIqmMbzqnUo0=", "path": "golang.org/x/crypto/ed25519", - "revision": "9477e0b78b9ac3d0b03822fd95422e2fe07627cd", - "revisionTime": "2016-10-31T15:37:30Z" + "revision": "9f005a07e0d31d45e6656d241bb5c0f2efd4bc94", + "revisionTime": "2017-09-21T17:41:56Z" }, { "checksumSHA1": "LXFcVx8I587SnWmKycSDEq9yvK8=", "path": "golang.org/x/crypto/ed25519/internal/edwards25519", - "revision": "9477e0b78b9ac3d0b03822fd95422e2fe07627cd", - "revisionTime": "2016-10-31T15:37:30Z" + "revision": "9f005a07e0d31d45e6656d241bb5c0f2efd4bc94", + "revisionTime": "2017-09-21T17:41:56Z" }, { "checksumSHA1": "MCeXr2RNeiG1XG6V+er1OR0qyeo=", "path": "golang.org/x/crypto/md4", - "revision": "ede567c8e044a5913dad1d1af3696d9da953104c", - "revisionTime": "2016-11-04T19:41:44Z" + "revision": "9f005a07e0d31d45e6656d241bb5c0f2efd4bc94", + "revisionTime": "2017-09-21T17:41:56Z" }, { "checksumSHA1": "1MGpGDQqnUoRpv7VEcQrXOBydXE=", "path": "golang.org/x/crypto/pbkdf2", - "revision": "8e06e8ddd9629eb88639aba897641bff8031f1d3", - "revisionTime": "2016-09-10T18:59:01Z" + "revision": "9f005a07e0d31d45e6656d241bb5c0f2efd4bc94", + "revisionTime": "2017-09-21T17:41:56Z" }, { - "checksumSHA1": "LlElMHeTC34ng8eHzjvtUhAgrr8=", + "checksumSHA1": "YXeyyvak2xbvsqj5MBHMzyG+22M=", "path": "golang.org/x/crypto/ssh", - "revision": "9477e0b78b9ac3d0b03822fd95422e2fe07627cd", - "revisionTime": "2016-10-31T15:37:30Z" + "revision": "9f005a07e0d31d45e6656d241bb5c0f2efd4bc94", + "revisionTime": "2017-09-21T17:41:56Z" }, { "checksumSHA1": "9jjO5GjLa0XF/nfWihF02RoH4qc=",