726 lines
16 KiB
Go
Executable File
726 lines
16 KiB
Go
Executable File
// Copyright 2011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package ssh
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import (
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"bytes"
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"encoding/binary"
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"errors"
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"fmt"
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"io"
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"math/big"
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"reflect"
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"strconv"
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)
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// These are SSH message type numbers. They are scattered around several
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// documents but many were taken from [SSH-PARAMETERS].
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const (
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msgIgnore = 2
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msgUnimplemented = 3
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msgDebug = 4
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msgNewKeys = 21
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// Standard authentication messages
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msgUserAuthSuccess = 52
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msgUserAuthBanner = 53
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)
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// SSH messages:
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//
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// These structures mirror the wire format of the corresponding SSH messages.
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// They are marshaled using reflection with the marshal and unmarshal functions
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// in this file. The only wrinkle is that a final member of type []byte with a
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// ssh tag of "rest" receives the remainder of a packet when unmarshaling.
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// See RFC 4253, section 11.1.
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const msgDisconnect = 1
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// disconnectMsg is the message that signals a disconnect. It is also
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// the error type returned from mux.Wait()
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type disconnectMsg struct {
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Reason uint32 `sshtype:"1"`
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Message string
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Language string
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}
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func (d *disconnectMsg) Error() string {
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return fmt.Sprintf("ssh: disconnect reason %d: %s", d.Reason, d.Message)
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}
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// See RFC 4253, section 7.1.
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const msgKexInit = 20
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type kexInitMsg struct {
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Cookie [16]byte `sshtype:"20"`
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KexAlgos []string
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ServerHostKeyAlgos []string
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CiphersClientServer []string
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CiphersServerClient []string
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MACsClientServer []string
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MACsServerClient []string
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CompressionClientServer []string
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CompressionServerClient []string
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LanguagesClientServer []string
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LanguagesServerClient []string
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FirstKexFollows bool
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Reserved uint32
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}
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// See RFC 4253, section 8.
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// Diffie-Helman
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const msgKexDHInit = 30
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type kexDHInitMsg struct {
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X *big.Int `sshtype:"30"`
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}
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const msgKexECDHInit = 30
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type kexECDHInitMsg struct {
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ClientPubKey []byte `sshtype:"30"`
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}
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const msgKexECDHReply = 31
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type kexECDHReplyMsg struct {
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HostKey []byte `sshtype:"31"`
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EphemeralPubKey []byte
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Signature []byte
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}
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const msgKexDHReply = 31
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type kexDHReplyMsg struct {
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HostKey []byte `sshtype:"31"`
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Y *big.Int
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Signature []byte
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}
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// See RFC 4253, section 10.
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const msgServiceRequest = 5
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type serviceRequestMsg struct {
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Service string `sshtype:"5"`
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}
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// See RFC 4253, section 10.
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const msgServiceAccept = 6
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type serviceAcceptMsg struct {
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Service string `sshtype:"6"`
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}
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// See RFC 4252, section 5.
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const msgUserAuthRequest = 50
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type userAuthRequestMsg struct {
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User string `sshtype:"50"`
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Service string
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Method string
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Payload []byte `ssh:"rest"`
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}
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// See RFC 4252, section 5.1
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const msgUserAuthFailure = 51
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type userAuthFailureMsg struct {
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Methods []string `sshtype:"51"`
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PartialSuccess bool
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}
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// See RFC 4256, section 3.2
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const msgUserAuthInfoRequest = 60
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const msgUserAuthInfoResponse = 61
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type userAuthInfoRequestMsg struct {
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User string `sshtype:"60"`
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Instruction string
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DeprecatedLanguage string
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NumPrompts uint32
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Prompts []byte `ssh:"rest"`
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}
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// See RFC 4254, section 5.1.
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const msgChannelOpen = 90
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type channelOpenMsg struct {
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ChanType string `sshtype:"90"`
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PeersId uint32
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PeersWindow uint32
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MaxPacketSize uint32
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TypeSpecificData []byte `ssh:"rest"`
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}
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const msgChannelExtendedData = 95
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const msgChannelData = 94
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// See RFC 4254, section 5.1.
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const msgChannelOpenConfirm = 91
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type channelOpenConfirmMsg struct {
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PeersId uint32 `sshtype:"91"`
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MyId uint32
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MyWindow uint32
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MaxPacketSize uint32
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TypeSpecificData []byte `ssh:"rest"`
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}
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// See RFC 4254, section 5.1.
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const msgChannelOpenFailure = 92
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type channelOpenFailureMsg struct {
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PeersId uint32 `sshtype:"92"`
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Reason RejectionReason
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Message string
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Language string
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}
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const msgChannelRequest = 98
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type channelRequestMsg struct {
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PeersId uint32 `sshtype:"98"`
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Request string
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WantReply bool
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RequestSpecificData []byte `ssh:"rest"`
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}
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// See RFC 4254, section 5.4.
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const msgChannelSuccess = 99
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type channelRequestSuccessMsg struct {
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PeersId uint32 `sshtype:"99"`
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}
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// See RFC 4254, section 5.4.
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const msgChannelFailure = 100
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type channelRequestFailureMsg struct {
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PeersId uint32 `sshtype:"100"`
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}
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// See RFC 4254, section 5.3
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const msgChannelClose = 97
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type channelCloseMsg struct {
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PeersId uint32 `sshtype:"97"`
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}
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// See RFC 4254, section 5.3
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const msgChannelEOF = 96
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type channelEOFMsg struct {
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PeersId uint32 `sshtype:"96"`
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}
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// See RFC 4254, section 4
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const msgGlobalRequest = 80
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type globalRequestMsg struct {
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Type string `sshtype:"80"`
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WantReply bool
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Data []byte `ssh:"rest"`
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}
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// See RFC 4254, section 4
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const msgRequestSuccess = 81
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type globalRequestSuccessMsg struct {
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Data []byte `ssh:"rest" sshtype:"81"`
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}
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// See RFC 4254, section 4
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const msgRequestFailure = 82
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type globalRequestFailureMsg struct {
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Data []byte `ssh:"rest" sshtype:"82"`
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}
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// See RFC 4254, section 5.2
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const msgChannelWindowAdjust = 93
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type windowAdjustMsg struct {
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PeersId uint32 `sshtype:"93"`
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AdditionalBytes uint32
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}
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// See RFC 4252, section 7
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const msgUserAuthPubKeyOk = 60
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type userAuthPubKeyOkMsg struct {
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Algo string `sshtype:"60"`
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PubKey []byte
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}
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// typeTag returns the type byte for the given type. The type should
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// be struct.
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func typeTag(structType reflect.Type) byte {
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var tag byte
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var tagStr string
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tagStr = structType.Field(0).Tag.Get("sshtype")
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i, err := strconv.Atoi(tagStr)
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if err == nil {
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tag = byte(i)
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}
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return tag
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}
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func fieldError(t reflect.Type, field int, problem string) error {
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if problem != "" {
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problem = ": " + problem
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}
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return fmt.Errorf("ssh: unmarshal error for field %s of type %s%s", t.Field(field).Name, t.Name(), problem)
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}
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var errShortRead = errors.New("ssh: short read")
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// Unmarshal parses data in SSH wire format into a structure. The out
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// argument should be a pointer to struct. If the first member of the
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// struct has the "sshtype" tag set to a number in decimal, the packet
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// must start that number. In case of error, Unmarshal returns a
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// ParseError or UnexpectedMessageError.
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func Unmarshal(data []byte, out interface{}) error {
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v := reflect.ValueOf(out).Elem()
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structType := v.Type()
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expectedType := typeTag(structType)
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if len(data) == 0 {
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return parseError(expectedType)
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}
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if expectedType > 0 {
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if data[0] != expectedType {
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return unexpectedMessageError(expectedType, data[0])
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}
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data = data[1:]
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}
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var ok bool
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for i := 0; i < v.NumField(); i++ {
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field := v.Field(i)
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t := field.Type()
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switch t.Kind() {
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case reflect.Bool:
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if len(data) < 1 {
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return errShortRead
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}
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field.SetBool(data[0] != 0)
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data = data[1:]
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case reflect.Array:
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if t.Elem().Kind() != reflect.Uint8 {
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return fieldError(structType, i, "array of unsupported type")
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}
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if len(data) < t.Len() {
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return errShortRead
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}
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for j, n := 0, t.Len(); j < n; j++ {
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field.Index(j).Set(reflect.ValueOf(data[j]))
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}
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data = data[t.Len():]
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case reflect.Uint64:
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var u64 uint64
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if u64, data, ok = parseUint64(data); !ok {
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return errShortRead
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}
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field.SetUint(u64)
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case reflect.Uint32:
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var u32 uint32
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if u32, data, ok = parseUint32(data); !ok {
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return errShortRead
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}
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field.SetUint(uint64(u32))
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case reflect.Uint8:
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if len(data) < 1 {
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return errShortRead
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}
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field.SetUint(uint64(data[0]))
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data = data[1:]
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case reflect.String:
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var s []byte
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if s, data, ok = parseString(data); !ok {
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return fieldError(structType, i, "")
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}
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field.SetString(string(s))
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case reflect.Slice:
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switch t.Elem().Kind() {
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case reflect.Uint8:
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if structType.Field(i).Tag.Get("ssh") == "rest" {
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field.Set(reflect.ValueOf(data))
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data = nil
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} else {
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var s []byte
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if s, data, ok = parseString(data); !ok {
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return errShortRead
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}
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field.Set(reflect.ValueOf(s))
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}
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case reflect.String:
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var nl []string
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if nl, data, ok = parseNameList(data); !ok {
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return errShortRead
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}
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field.Set(reflect.ValueOf(nl))
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default:
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return fieldError(structType, i, "slice of unsupported type")
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}
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case reflect.Ptr:
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if t == bigIntType {
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var n *big.Int
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if n, data, ok = parseInt(data); !ok {
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return errShortRead
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}
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field.Set(reflect.ValueOf(n))
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} else {
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return fieldError(structType, i, "pointer to unsupported type")
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}
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default:
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return fieldError(structType, i, "unsupported type")
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}
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}
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if len(data) != 0 {
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return parseError(expectedType)
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}
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return nil
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}
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// Marshal serializes the message in msg to SSH wire format. The msg
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// argument should be a struct or pointer to struct. If the first
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// member has the "sshtype" tag set to a number in decimal, that
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// number is prepended to the result. If the last of member has the
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// "ssh" tag set to "rest", its contents are appended to the output.
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func Marshal(msg interface{}) []byte {
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out := make([]byte, 0, 64)
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return marshalStruct(out, msg)
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}
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func marshalStruct(out []byte, msg interface{}) []byte {
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v := reflect.Indirect(reflect.ValueOf(msg))
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msgType := typeTag(v.Type())
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if msgType > 0 {
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out = append(out, msgType)
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}
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for i, n := 0, v.NumField(); i < n; i++ {
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field := v.Field(i)
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switch t := field.Type(); t.Kind() {
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case reflect.Bool:
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var v uint8
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if field.Bool() {
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v = 1
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}
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out = append(out, v)
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case reflect.Array:
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if t.Elem().Kind() != reflect.Uint8 {
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panic(fmt.Sprintf("array of non-uint8 in field %d: %T", i, field.Interface()))
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}
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for j, l := 0, t.Len(); j < l; j++ {
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out = append(out, uint8(field.Index(j).Uint()))
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}
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case reflect.Uint32:
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out = appendU32(out, uint32(field.Uint()))
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case reflect.Uint64:
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out = appendU64(out, uint64(field.Uint()))
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case reflect.Uint8:
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out = append(out, uint8(field.Uint()))
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case reflect.String:
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s := field.String()
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out = appendInt(out, len(s))
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out = append(out, s...)
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case reflect.Slice:
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switch t.Elem().Kind() {
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case reflect.Uint8:
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if v.Type().Field(i).Tag.Get("ssh") != "rest" {
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out = appendInt(out, field.Len())
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}
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out = append(out, field.Bytes()...)
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case reflect.String:
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offset := len(out)
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out = appendU32(out, 0)
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if n := field.Len(); n > 0 {
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for j := 0; j < n; j++ {
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f := field.Index(j)
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if j != 0 {
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out = append(out, ',')
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}
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out = append(out, f.String()...)
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}
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// overwrite length value
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binary.BigEndian.PutUint32(out[offset:], uint32(len(out)-offset-4))
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}
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default:
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panic(fmt.Sprintf("slice of unknown type in field %d: %T", i, field.Interface()))
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}
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case reflect.Ptr:
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if t == bigIntType {
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var n *big.Int
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nValue := reflect.ValueOf(&n)
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nValue.Elem().Set(field)
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needed := intLength(n)
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oldLength := len(out)
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if cap(out)-len(out) < needed {
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newOut := make([]byte, len(out), 2*(len(out)+needed))
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copy(newOut, out)
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out = newOut
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}
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out = out[:oldLength+needed]
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marshalInt(out[oldLength:], n)
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} else {
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panic(fmt.Sprintf("pointer to unknown type in field %d: %T", i, field.Interface()))
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}
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}
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}
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return out
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}
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var bigOne = big.NewInt(1)
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func parseString(in []byte) (out, rest []byte, ok bool) {
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if len(in) < 4 {
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return
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}
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length := binary.BigEndian.Uint32(in)
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in = in[4:]
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if uint32(len(in)) < length {
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return
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}
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out = in[:length]
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rest = in[length:]
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ok = true
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return
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}
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var (
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comma = []byte{','}
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emptyNameList = []string{}
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)
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func parseNameList(in []byte) (out []string, rest []byte, ok bool) {
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contents, rest, ok := parseString(in)
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if !ok {
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return
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}
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if len(contents) == 0 {
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out = emptyNameList
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return
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}
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parts := bytes.Split(contents, comma)
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out = make([]string, len(parts))
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for i, part := range parts {
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out[i] = string(part)
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}
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return
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}
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func parseInt(in []byte) (out *big.Int, rest []byte, ok bool) {
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contents, rest, ok := parseString(in)
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if !ok {
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return
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}
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out = new(big.Int)
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if len(contents) > 0 && contents[0]&0x80 == 0x80 {
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// This is a negative number
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notBytes := make([]byte, len(contents))
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for i := range notBytes {
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notBytes[i] = ^contents[i]
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}
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out.SetBytes(notBytes)
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out.Add(out, bigOne)
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out.Neg(out)
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} else {
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// Positive number
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out.SetBytes(contents)
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}
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ok = true
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return
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}
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func parseUint32(in []byte) (uint32, []byte, bool) {
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if len(in) < 4 {
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return 0, nil, false
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}
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return binary.BigEndian.Uint32(in), in[4:], true
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}
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func parseUint64(in []byte) (uint64, []byte, bool) {
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if len(in) < 8 {
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return 0, nil, false
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}
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return binary.BigEndian.Uint64(in), in[8:], true
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}
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func intLength(n *big.Int) int {
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length := 4 /* length bytes */
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|
if n.Sign() < 0 {
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nMinus1 := new(big.Int).Neg(n)
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nMinus1.Sub(nMinus1, bigOne)
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bitLen := nMinus1.BitLen()
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if bitLen%8 == 0 {
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// The number will need 0xff padding
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length++
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}
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length += (bitLen + 7) / 8
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} else if n.Sign() == 0 {
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|
// A zero is the zero length string
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|
} else {
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bitLen := n.BitLen()
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if bitLen%8 == 0 {
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// The number will need 0x00 padding
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length++
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}
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length += (bitLen + 7) / 8
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}
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return length
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}
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func marshalUint32(to []byte, n uint32) []byte {
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binary.BigEndian.PutUint32(to, n)
|
|
return to[4:]
|
|
}
|
|
|
|
func marshalUint64(to []byte, n uint64) []byte {
|
|
binary.BigEndian.PutUint64(to, n)
|
|
return to[8:]
|
|
}
|
|
|
|
func marshalInt(to []byte, n *big.Int) []byte {
|
|
lengthBytes := to
|
|
to = to[4:]
|
|
length := 0
|
|
|
|
if n.Sign() < 0 {
|
|
// A negative number has to be converted to two's-complement
|
|
// form. So we'll subtract 1 and invert. If the
|
|
// most-significant-bit isn't set then we'll need to pad the
|
|
// beginning with 0xff in order to keep the number negative.
|
|
nMinus1 := new(big.Int).Neg(n)
|
|
nMinus1.Sub(nMinus1, bigOne)
|
|
bytes := nMinus1.Bytes()
|
|
for i := range bytes {
|
|
bytes[i] ^= 0xff
|
|
}
|
|
if len(bytes) == 0 || bytes[0]&0x80 == 0 {
|
|
to[0] = 0xff
|
|
to = to[1:]
|
|
length++
|
|
}
|
|
nBytes := copy(to, bytes)
|
|
to = to[nBytes:]
|
|
length += nBytes
|
|
} else if n.Sign() == 0 {
|
|
// A zero is the zero length string
|
|
} else {
|
|
bytes := n.Bytes()
|
|
if len(bytes) > 0 && bytes[0]&0x80 != 0 {
|
|
// We'll have to pad this with a 0x00 in order to
|
|
// stop it looking like a negative number.
|
|
to[0] = 0
|
|
to = to[1:]
|
|
length++
|
|
}
|
|
nBytes := copy(to, bytes)
|
|
to = to[nBytes:]
|
|
length += nBytes
|
|
}
|
|
|
|
lengthBytes[0] = byte(length >> 24)
|
|
lengthBytes[1] = byte(length >> 16)
|
|
lengthBytes[2] = byte(length >> 8)
|
|
lengthBytes[3] = byte(length)
|
|
return to
|
|
}
|
|
|
|
func writeInt(w io.Writer, n *big.Int) {
|
|
length := intLength(n)
|
|
buf := make([]byte, length)
|
|
marshalInt(buf, n)
|
|
w.Write(buf)
|
|
}
|
|
|
|
func writeString(w io.Writer, s []byte) {
|
|
var lengthBytes [4]byte
|
|
lengthBytes[0] = byte(len(s) >> 24)
|
|
lengthBytes[1] = byte(len(s) >> 16)
|
|
lengthBytes[2] = byte(len(s) >> 8)
|
|
lengthBytes[3] = byte(len(s))
|
|
w.Write(lengthBytes[:])
|
|
w.Write(s)
|
|
}
|
|
|
|
func stringLength(n int) int {
|
|
return 4 + n
|
|
}
|
|
|
|
func marshalString(to []byte, s []byte) []byte {
|
|
to[0] = byte(len(s) >> 24)
|
|
to[1] = byte(len(s) >> 16)
|
|
to[2] = byte(len(s) >> 8)
|
|
to[3] = byte(len(s))
|
|
to = to[4:]
|
|
copy(to, s)
|
|
return to[len(s):]
|
|
}
|
|
|
|
var bigIntType = reflect.TypeOf((*big.Int)(nil))
|
|
|
|
// Decode a packet into its corresponding message.
|
|
func decode(packet []byte) (interface{}, error) {
|
|
var msg interface{}
|
|
switch packet[0] {
|
|
case msgDisconnect:
|
|
msg = new(disconnectMsg)
|
|
case msgServiceRequest:
|
|
msg = new(serviceRequestMsg)
|
|
case msgServiceAccept:
|
|
msg = new(serviceAcceptMsg)
|
|
case msgKexInit:
|
|
msg = new(kexInitMsg)
|
|
case msgKexDHInit:
|
|
msg = new(kexDHInitMsg)
|
|
case msgKexDHReply:
|
|
msg = new(kexDHReplyMsg)
|
|
case msgUserAuthRequest:
|
|
msg = new(userAuthRequestMsg)
|
|
case msgUserAuthFailure:
|
|
msg = new(userAuthFailureMsg)
|
|
case msgUserAuthPubKeyOk:
|
|
msg = new(userAuthPubKeyOkMsg)
|
|
case msgGlobalRequest:
|
|
msg = new(globalRequestMsg)
|
|
case msgRequestSuccess:
|
|
msg = new(globalRequestSuccessMsg)
|
|
case msgRequestFailure:
|
|
msg = new(globalRequestFailureMsg)
|
|
case msgChannelOpen:
|
|
msg = new(channelOpenMsg)
|
|
case msgChannelOpenConfirm:
|
|
msg = new(channelOpenConfirmMsg)
|
|
case msgChannelOpenFailure:
|
|
msg = new(channelOpenFailureMsg)
|
|
case msgChannelWindowAdjust:
|
|
msg = new(windowAdjustMsg)
|
|
case msgChannelEOF:
|
|
msg = new(channelEOFMsg)
|
|
case msgChannelClose:
|
|
msg = new(channelCloseMsg)
|
|
case msgChannelRequest:
|
|
msg = new(channelRequestMsg)
|
|
case msgChannelSuccess:
|
|
msg = new(channelRequestSuccessMsg)
|
|
case msgChannelFailure:
|
|
msg = new(channelRequestFailureMsg)
|
|
default:
|
|
return nil, unexpectedMessageError(0, packet[0])
|
|
}
|
|
if err := Unmarshal(packet, msg); err != nil {
|
|
return nil, err
|
|
}
|
|
return msg, nil
|
|
}
|