1992 lines
62 KiB
JavaScript
1992 lines
62 KiB
JavaScript
/*
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TODO:
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* Replace `buffer._pos` usage in keyParser.js and elsewhere
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* Utilize optional "writev" support when writing packets from
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cipher.encrypt()
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* Built-in support for automatic re-keying, on by default
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* Revisit receiving unexpected/unknown packets
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* Error (fatal or otherwise) or ignore or pass on to user (in some or all
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cases)?
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* Including server/client check for single directional packet types?
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* Check packets for validity or bail as early as possible?
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* Automatic re-key every 2**31 packets after the last key exchange (sent or
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received), as suggested by RFC4344. OpenSSH currently does this.
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* Automatic re-key every so many blocks depending on cipher. RFC4344:
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Because of a birthday property of block ciphers and some modes of
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operation, implementations must be careful not to encrypt too many
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blocks with the same encryption key.
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Let L be the block length (in bits) of an SSH encryption method's
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block cipher (e.g., 128 for AES). If L is at least 128, then, after
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rekeying, an SSH implementation SHOULD NOT encrypt more than 2**(L/4)
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blocks before rekeying again. If L is at least 128, then SSH
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implementations should also attempt to force a rekey before receiving
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more than 2**(L/4) blocks. If L is less than 128 (which is the case
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for older ciphers such as 3DES, Blowfish, CAST-128, and IDEA), then,
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although it may be too expensive to rekey every 2**(L/4) blocks, it
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is still advisable for SSH implementations to follow the original
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recommendation in [RFC4253]: rekey at least once for every gigabyte
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of transmitted data.
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Note that if L is less than or equal to 128, then the recommendation
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in this subsection supersedes the recommendation in Section 3.1. If
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an SSH implementation uses a block cipher with a larger block size
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(e.g., Rijndael with 256-bit blocks), then the recommendations in
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Section 3.1 may supersede the recommendations in this subsection
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(depending on the lengths of the packets).
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*/
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'use strict'
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const { inspect } = require('bare-node-util')
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const { bindingAvailable, NullCipher, NullDecipher } = require('./crypto.js')
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const {
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COMPAT_CHECKS,
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DISCONNECT_REASON,
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eddsaSupported,
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MESSAGE,
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SIGNALS,
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TERMINAL_MODE
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} = require('./constants.js')
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const {
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DEFAULT_KEXINIT_CLIENT,
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DEFAULT_KEXINIT_SERVER,
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KexInit,
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kexinit,
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onKEXPayload
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} = require('./kex.js')
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const { parseKey } = require('./keyParser.js')
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const MESSAGE_HANDLERS = require('./handlers.js')
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const {
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bufferCopy,
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bufferFill,
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bufferSlice,
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convertSignature,
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sendPacket,
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writeUInt32BE
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} = require('./utils.js')
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const { PacketReader, PacketWriter, ZlibPacketReader, ZlibPacketWriter } = require('./zlib.js')
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const MODULE_VER = require('../../package.json').version
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const VALID_DISCONNECT_REASONS = new Map(Object.values(DISCONNECT_REASON).map((n) => [n, 1]))
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const IDENT_RAW = Buffer.from(`SSH-2.0-ssh2js${MODULE_VER}`)
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const IDENT = Buffer.from(`${IDENT_RAW}\r\n`)
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const MAX_LINE_LEN = 8192
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const MAX_LINES = 1024
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const PING_PAYLOAD = Buffer.from([
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MESSAGE.GLOBAL_REQUEST,
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// "[email protected]"
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0,
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0,
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0,
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21,
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107,
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101,
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101,
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112,
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97,
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108,
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105,
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118,
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101,
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64,
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111,
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112,
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101,
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110,
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115,
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115,
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104,
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46,
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99,
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111,
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109,
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// Request a reply
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1
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])
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const NO_TERMINAL_MODES_BUFFER = Buffer.from([TERMINAL_MODE.TTY_OP_END])
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function noop() {}
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/*
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Inbound:
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* kexinit payload (needed only until exchange hash is generated)
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* raw ident
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* rekey packet queue
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* expected packet (implemented as separate _parse() function?)
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Outbound:
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* kexinit payload (needed only until exchange hash is generated)
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* rekey packet queue
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* kex secret (needed only until NEWKEYS)
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* exchange hash (needed only until NEWKEYS)
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* session ID (set to exchange hash from initial handshake)
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*/
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class Protocol {
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constructor(config) {
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const onWrite = config.onWrite
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if (typeof onWrite !== 'function') throw new Error('Missing onWrite function')
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this._onWrite = (data) => {
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onWrite(data)
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}
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const onError = config.onError
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if (typeof onError !== 'function') throw new Error('Missing onError function')
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this._onError = (err) => {
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onError(err)
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}
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const debug = config.debug
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this._debug =
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typeof debug === 'function'
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? (msg) => {
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debug(msg)
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}
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: undefined
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const onHeader = config.onHeader
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this._onHeader =
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typeof onHeader === 'function'
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? (...args) => {
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onHeader(...args)
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}
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: noop
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const onPacket = config.onPacket
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this._onPacket =
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typeof onPacket === 'function'
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? () => {
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onPacket()
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}
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: noop
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let onHandshakeComplete = config.onHandshakeComplete
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if (typeof onHandshakeComplete !== 'function') onHandshakeComplete = noop
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let firstHandshake
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this._onHandshakeComplete = (...args) => {
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this._debug && this._debug('Handshake completed')
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if (firstHandshake === undefined) firstHandshake = true
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else firstHandshake = false
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// Process packets queued during a rekey where necessary
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const oldQueue = this._queue
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if (oldQueue) {
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this._queue = undefined
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this._debug && this._debug(`Draining outbound queue (${oldQueue.length}) ...`)
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for (let i = 0; i < oldQueue.length; ++i) {
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const data = oldQueue[i]
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// data === payload only
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// XXX: hacky
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let finalized = this._packetRW.write.finalize(data)
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if (finalized === data) {
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const packet = this._cipher.allocPacket(data.length)
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packet.set(data, 5)
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finalized = packet
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}
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sendPacket(this, finalized)
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}
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this._debug && this._debug('... finished draining outbound queue')
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}
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if (firstHandshake && this._server && this._kex.remoteExtInfoEnabled) sendExtInfo(this)
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onHandshakeComplete(...args)
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}
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this._queue = undefined
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const messageHandlers = config.messageHandlers
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if (typeof messageHandlers === 'object' && messageHandlers !== null)
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this._handlers = messageHandlers
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else this._handlers = {}
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this._onPayload = onPayload.bind(this)
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this._server = !!config.server
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this._banner = undefined
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let greeting
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if (this._server) {
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if (typeof config.hostKeys !== 'object' || config.hostKeys === null)
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throw new Error('Missing server host key(s)')
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this._hostKeys = config.hostKeys
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// Greeting displayed before the ssh identification string is sent, this
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// is usually ignored by most clients
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if (typeof config.greeting === 'string' && config.greeting.length) {
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greeting = config.greeting.slice(-2) === '\r\n' ? config.greeting : `${config.greeting}\r\n`
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}
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// Banner shown after the handshake completes, but before user
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// authentication begins
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if (typeof config.banner === 'string' && config.banner.length) {
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this._banner = config.banner.slice(-2) === '\r\n' ? config.banner : `${config.banner}\r\n`
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}
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} else {
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this._hostKeys = undefined
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}
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let offer = config.offer
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if (typeof offer !== 'object' || offer === null) {
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offer = this._server ? DEFAULT_KEXINIT_SERVER : DEFAULT_KEXINIT_CLIENT
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} else if (offer.constructor !== KexInit) {
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if (this._server) {
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offer.kex = offer.kex.concat(['[email protected]'])
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} else {
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offer.kex = offer.kex.concat(['ext-info-c', '[email protected]'])
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}
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offer = new KexInit(offer)
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}
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this._kex = undefined
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this._strictMode = undefined
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this._kexinit = undefined
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this._offer = offer
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this._cipher = new NullCipher(0, this._onWrite)
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this._decipher = undefined
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this._skipNextInboundPacket = false
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this._packetRW = {
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read: new PacketReader(),
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write: new PacketWriter(this)
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}
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this._hostVerifier =
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!this._server && typeof config.hostVerifier === 'function' ? config.hostVerifier : undefined
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this._parse = parseHeader
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this._buffer = undefined
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this._authsQueue = []
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this._authenticated = false
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this._remoteIdentRaw = undefined
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let sentIdent
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if (typeof config.ident === 'string') {
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this._identRaw = Buffer.from(`SSH-2.0-${config.ident}`)
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sentIdent = Buffer.allocUnsafe(this._identRaw.length + 2)
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sentIdent.set(this._identRaw, 0)
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sentIdent[sentIdent.length - 2] = 13 // '\r'
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sentIdent[sentIdent.length - 1] = 10 // '\n'
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} else if (Buffer.isBuffer(config.ident)) {
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const fullIdent = Buffer.allocUnsafe(8 + config.ident.length)
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fullIdent.latin1Write('SSH-2.0-', 0, 8)
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fullIdent.set(config.ident, 8)
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this._identRaw = fullIdent
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sentIdent = Buffer.allocUnsafe(fullIdent.length + 2)
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sentIdent.set(fullIdent, 0)
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sentIdent[sentIdent.length - 2] = 13 // '\r'
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sentIdent[sentIdent.length - 1] = 10 // '\n'
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} else {
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this._identRaw = IDENT_RAW
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sentIdent = IDENT
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}
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this._compatFlags = 0
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if (this._debug) {
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if (bindingAvailable) this._debug('Custom crypto binding available')
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else this._debug('Custom crypto binding not available')
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}
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this._debug && this._debug(`Local ident: ${inspect(this._identRaw.toString())}`)
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this.start = () => {
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this.start = undefined
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if (greeting) this._onWrite(greeting)
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this._onWrite(sentIdent)
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}
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}
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_destruct(reason) {
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this._packetRW.read.cleanup()
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this._packetRW.write.cleanup()
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this._cipher && this._cipher.free()
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this._decipher && this._decipher.free()
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if (typeof reason !== 'string' || reason.length === 0) reason = 'fatal error'
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this.parse = () => {
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throw new Error(`Instance unusable after ${reason}`)
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}
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this._onWrite = () => {
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throw new Error(`Instance unusable after ${reason}`)
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}
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this._destruct = undefined
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}
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cleanup() {
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this._destruct && this._destruct()
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}
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parse(chunk, i, len) {
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while (i < len) i = this._parse(chunk, i, len)
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}
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// Protocol message API
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// ===========================================================================
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// Common/Shared =============================================================
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// ===========================================================================
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// Global
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// ------
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disconnect(reason) {
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const pktLen = 1 + 4 + 4 + 4
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// We don't use _packetRW.write.* here because we need to make sure that
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// we always get a full packet allocated because this message can be sent
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// at any time -- even during a key exchange
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let p = this._packetRW.write.allocStartKEX
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const packet = this._packetRW.write.alloc(pktLen, true)
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const end = p + pktLen
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if (!VALID_DISCONNECT_REASONS.has(reason)) reason = DISCONNECT_REASON.PROTOCOL_ERROR
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packet[p] = MESSAGE.DISCONNECT
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writeUInt32BE(packet, reason, ++p)
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packet.fill(0, (p += 4), end)
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this._debug && this._debug(`Outbound: Sending DISCONNECT (${reason})`)
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sendPacket(this, this._packetRW.write.finalize(packet, true), true)
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}
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ping() {
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const p = this._packetRW.write.allocStart
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const packet = this._packetRW.write.alloc(PING_PAYLOAD.length)
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packet.set(PING_PAYLOAD, p)
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this._debug && this._debug('Outbound: Sending ping (GLOBAL_REQUEST: [email protected])')
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sendPacket(this, this._packetRW.write.finalize(packet))
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}
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rekey() {
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if (this._kexinit === undefined) {
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this._debug && this._debug('Outbound: Initiated explicit rekey')
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this._queue = []
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kexinit(this)
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} else {
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this._debug && this._debug('Outbound: Ignoring rekey during handshake')
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}
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}
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// 'ssh-connection' service-specific
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// ---------------------------------
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requestSuccess(data) {
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let p = this._packetRW.write.allocStart
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let packet
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if (Buffer.isBuffer(data)) {
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packet = this._packetRW.write.alloc(1 + data.length)
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packet[p] = MESSAGE.REQUEST_SUCCESS
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packet.set(data, ++p)
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} else {
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packet = this._packetRW.write.alloc(1)
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packet[p] = MESSAGE.REQUEST_SUCCESS
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}
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this._debug && this._debug('Outbound: Sending REQUEST_SUCCESS')
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sendPacket(this, this._packetRW.write.finalize(packet))
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}
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requestFailure() {
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const p = this._packetRW.write.allocStart
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const packet = this._packetRW.write.alloc(1)
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packet[p] = MESSAGE.REQUEST_FAILURE
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this._debug && this._debug('Outbound: Sending REQUEST_FAILURE')
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sendPacket(this, this._packetRW.write.finalize(packet))
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}
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channelSuccess(chan) {
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// Does not consume window space
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let p = this._packetRW.write.allocStart
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const packet = this._packetRW.write.alloc(1 + 4)
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packet[p] = MESSAGE.CHANNEL_SUCCESS
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writeUInt32BE(packet, chan, ++p)
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this._debug && this._debug(`Outbound: Sending CHANNEL_SUCCESS (r:${chan})`)
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sendPacket(this, this._packetRW.write.finalize(packet))
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}
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channelFailure(chan) {
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// Does not consume window space
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let p = this._packetRW.write.allocStart
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const packet = this._packetRW.write.alloc(1 + 4)
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packet[p] = MESSAGE.CHANNEL_FAILURE
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writeUInt32BE(packet, chan, ++p)
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this._debug && this._debug(`Outbound: Sending CHANNEL_FAILURE (r:${chan})`)
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sendPacket(this, this._packetRW.write.finalize(packet))
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}
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channelEOF(chan) {
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// Does not consume window space
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let p = this._packetRW.write.allocStart
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const packet = this._packetRW.write.alloc(1 + 4)
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packet[p] = MESSAGE.CHANNEL_EOF
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writeUInt32BE(packet, chan, ++p)
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this._debug && this._debug(`Outbound: Sending CHANNEL_EOF (r:${chan})`)
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sendPacket(this, this._packetRW.write.finalize(packet))
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}
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channelClose(chan) {
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// Does not consume window space
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let p = this._packetRW.write.allocStart
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const packet = this._packetRW.write.alloc(1 + 4)
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packet[p] = MESSAGE.CHANNEL_CLOSE
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writeUInt32BE(packet, chan, ++p)
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this._debug && this._debug(`Outbound: Sending CHANNEL_CLOSE (r:${chan})`)
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sendPacket(this, this._packetRW.write.finalize(packet))
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}
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channelWindowAdjust(chan, amount) {
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// Does not consume window space
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let p = this._packetRW.write.allocStart
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const packet = this._packetRW.write.alloc(1 + 4 + 4)
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packet[p] = MESSAGE.CHANNEL_WINDOW_ADJUST
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writeUInt32BE(packet, chan, ++p)
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writeUInt32BE(packet, amount, (p += 4))
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this._debug && this._debug(`Outbound: Sending CHANNEL_WINDOW_ADJUST (r:${chan}, ${amount})`)
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sendPacket(this, this._packetRW.write.finalize(packet))
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}
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channelData(chan, data) {
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const isBuffer = Buffer.isBuffer(data)
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const dataLen = isBuffer ? data.length : Buffer.byteLength(data)
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let p = this._packetRW.write.allocStart
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const packet = this._packetRW.write.alloc(1 + 4 + 4 + dataLen)
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packet[p] = MESSAGE.CHANNEL_DATA
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writeUInt32BE(packet, chan, ++p)
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writeUInt32BE(packet, dataLen, (p += 4))
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if (isBuffer) packet.set(data, (p += 4))
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else packet.utf8Write(data, (p += 4), dataLen)
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this._debug && this._debug(`Outbound: Sending CHANNEL_DATA (r:${chan}, ${dataLen})`)
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sendPacket(this, this._packetRW.write.finalize(packet))
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}
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channelExtData(chan, data, type) {
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const isBuffer = Buffer.isBuffer(data)
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const dataLen = isBuffer ? data.length : Buffer.byteLength(data)
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let p = this._packetRW.write.allocStart
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const packet = this._packetRW.write.alloc(1 + 4 + 4 + 4 + dataLen)
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packet[p] = MESSAGE.CHANNEL_EXTENDED_DATA
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writeUInt32BE(packet, chan, ++p)
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writeUInt32BE(packet, type, (p += 4))
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writeUInt32BE(packet, dataLen, (p += 4))
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if (isBuffer) packet.set(data, (p += 4))
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else packet.utf8Write(data, (p += 4), dataLen)
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this._debug && this._debug(`Outbound: Sending CHANNEL_EXTENDED_DATA (r:${chan})`)
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sendPacket(this, this._packetRW.write.finalize(packet))
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}
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channelOpenConfirm(remote, local, initWindow, maxPacket) {
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let p = this._packetRW.write.allocStart
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const packet = this._packetRW.write.alloc(1 + 4 + 4 + 4 + 4)
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packet[p] = MESSAGE.CHANNEL_OPEN_CONFIRMATION
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writeUInt32BE(packet, remote, ++p)
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writeUInt32BE(packet, local, (p += 4))
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writeUInt32BE(packet, initWindow, (p += 4))
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writeUInt32BE(packet, maxPacket, (p += 4))
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this._debug &&
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this._debug(`Outbound: Sending CHANNEL_OPEN_CONFIRMATION (r:${remote}, l:${local})`)
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sendPacket(this, this._packetRW.write.finalize(packet))
|
|
}
|
|
channelOpenFail(remote, reason, desc) {
|
|
if (typeof desc !== 'string') desc = ''
|
|
|
|
const descLen = Buffer.byteLength(desc)
|
|
let p = this._packetRW.write.allocStart
|
|
const packet = this._packetRW.write.alloc(1 + 4 + 4 + 4 + descLen + 4)
|
|
|
|
packet[p] = MESSAGE.CHANNEL_OPEN_FAILURE
|
|
|
|
writeUInt32BE(packet, remote, ++p)
|
|
|
|
writeUInt32BE(packet, reason, (p += 4))
|
|
|
|
writeUInt32BE(packet, descLen, (p += 4))
|
|
|
|
p += 4
|
|
if (descLen) {
|
|
packet.utf8Write(desc, p, descLen)
|
|
p += descLen
|
|
}
|
|
|
|
writeUInt32BE(packet, 0, p) // Empty language tag
|
|
|
|
this._debug && this._debug(`Outbound: Sending CHANNEL_OPEN_FAILURE (r:${remote})`)
|
|
sendPacket(this, this._packetRW.write.finalize(packet))
|
|
}
|
|
|
|
// ===========================================================================
|
|
// Client-specific ===========================================================
|
|
// ===========================================================================
|
|
|
|
// Global
|
|
// ------
|
|
service(name) {
|
|
if (this._server) throw new Error('Client-only method called in server mode')
|
|
|
|
const nameLen = Buffer.byteLength(name)
|
|
let p = this._packetRW.write.allocStart
|
|
const packet = this._packetRW.write.alloc(1 + 4 + nameLen)
|
|
|
|
packet[p] = MESSAGE.SERVICE_REQUEST
|
|
|
|
writeUInt32BE(packet, nameLen, ++p)
|
|
packet.utf8Write(name, (p += 4), nameLen)
|
|
|
|
this._debug && this._debug(`Outbound: Sending SERVICE_REQUEST (${name})`)
|
|
sendPacket(this, this._packetRW.write.finalize(packet))
|
|
}
|
|
|
|
// 'ssh-userauth' service-specific
|
|
// -------------------------------
|
|
authPassword(username, password, newPassword) {
|
|
if (this._server) throw new Error('Client-only method called in server mode')
|
|
|
|
const userLen = Buffer.byteLength(username)
|
|
const passLen = Buffer.byteLength(password)
|
|
const newPassLen = newPassword ? Buffer.byteLength(newPassword) : 0
|
|
let p = this._packetRW.write.allocStart
|
|
const packet = this._packetRW.write.alloc(
|
|
1 + 4 + userLen + 4 + 14 + 4 + 8 + 1 + 4 + passLen + (newPassword ? 4 + newPassLen : 0)
|
|
)
|
|
|
|
packet[p] = MESSAGE.USERAUTH_REQUEST
|
|
|
|
writeUInt32BE(packet, userLen, ++p)
|
|
packet.utf8Write(username, (p += 4), userLen)
|
|
|
|
writeUInt32BE(packet, 14, (p += userLen))
|
|
packet.utf8Write('ssh-connection', (p += 4), 14)
|
|
|
|
writeUInt32BE(packet, 8, (p += 14))
|
|
packet.utf8Write('password', (p += 4), 8)
|
|
|
|
packet[(p += 8)] = newPassword ? 1 : 0
|
|
|
|
writeUInt32BE(packet, passLen, ++p)
|
|
if (Buffer.isBuffer(password)) bufferCopy(password, packet, 0, passLen, (p += 4))
|
|
else packet.utf8Write(password, (p += 4), passLen)
|
|
|
|
if (newPassword) {
|
|
writeUInt32BE(packet, newPassLen, (p += passLen))
|
|
if (Buffer.isBuffer(newPassword)) bufferCopy(newPassword, packet, 0, newPassLen, (p += 4))
|
|
else packet.utf8Write(newPassword, (p += 4), newPassLen)
|
|
this._debug && this._debug('Outbound: Sending USERAUTH_REQUEST (changed password)')
|
|
} else {
|
|
this._debug && this._debug('Outbound: Sending USERAUTH_REQUEST (password)')
|
|
}
|
|
|
|
this._authsQueue.push('password')
|
|
|
|
sendPacket(this, this._packetRW.write.finalize(packet))
|
|
}
|
|
authPK(username, pubKey, keyAlgo, cbSign) {
|
|
if (this._server) throw new Error('Client-only method called in server mode')
|
|
|
|
pubKey = parseKey(pubKey)
|
|
if (pubKey instanceof Error) throw new Error('Invalid key')
|
|
|
|
const keyType = pubKey.type
|
|
pubKey = pubKey.getPublicSSH()
|
|
|
|
if (typeof keyAlgo === 'function') {
|
|
cbSign = keyAlgo
|
|
keyAlgo = undefined
|
|
}
|
|
if (!keyAlgo) keyAlgo = keyType
|
|
|
|
const userLen = Buffer.byteLength(username)
|
|
const algoLen = Buffer.byteLength(keyAlgo)
|
|
const pubKeyLen = pubKey.length
|
|
const sessionID = this._kex.sessionID
|
|
const sesLen = sessionID.length
|
|
const payloadLen =
|
|
(cbSign ? 4 + sesLen : 0) + 1 + 4 + userLen + 4 + 14 + 4 + 9 + 1 + 4 + algoLen + 4 + pubKeyLen
|
|
let packet
|
|
let p
|
|
if (cbSign) {
|
|
packet = Buffer.allocUnsafe(payloadLen)
|
|
p = 0
|
|
writeUInt32BE(packet, sesLen, p)
|
|
packet.set(sessionID, (p += 4))
|
|
p += sesLen
|
|
} else {
|
|
packet = this._packetRW.write.alloc(payloadLen)
|
|
p = this._packetRW.write.allocStart
|
|
}
|
|
|
|
packet[p] = MESSAGE.USERAUTH_REQUEST
|
|
|
|
writeUInt32BE(packet, userLen, ++p)
|
|
packet.utf8Write(username, (p += 4), userLen)
|
|
|
|
writeUInt32BE(packet, 14, (p += userLen))
|
|
packet.utf8Write('ssh-connection', (p += 4), 14)
|
|
|
|
writeUInt32BE(packet, 9, (p += 14))
|
|
packet.utf8Write('publickey', (p += 4), 9)
|
|
|
|
packet[(p += 9)] = cbSign ? 1 : 0
|
|
|
|
writeUInt32BE(packet, algoLen, ++p)
|
|
packet.utf8Write(keyAlgo, (p += 4), algoLen)
|
|
|
|
writeUInt32BE(packet, pubKeyLen, (p += algoLen))
|
|
packet.set(pubKey, (p += 4))
|
|
|
|
if (!cbSign) {
|
|
this._authsQueue.push('publickey')
|
|
|
|
this._debug && this._debug('Outbound: Sending USERAUTH_REQUEST (publickey -- check)')
|
|
sendPacket(this, this._packetRW.write.finalize(packet))
|
|
return
|
|
}
|
|
|
|
cbSign(packet, (signature) => {
|
|
signature = convertSignature(signature, keyType)
|
|
if (signature === false) throw new Error('Error while converting handshake signature')
|
|
|
|
const sigLen = signature.length
|
|
p = this._packetRW.write.allocStart
|
|
packet = this._packetRW.write.alloc(
|
|
1 +
|
|
4 +
|
|
userLen +
|
|
4 +
|
|
14 +
|
|
4 +
|
|
9 +
|
|
1 +
|
|
4 +
|
|
algoLen +
|
|
4 +
|
|
pubKeyLen +
|
|
4 +
|
|
4 +
|
|
algoLen +
|
|
4 +
|
|
sigLen
|
|
)
|
|
|
|
// TODO: simply copy from original "packet" to new `packet` to avoid
|
|
// having to write each individual field a second time?
|
|
packet[p] = MESSAGE.USERAUTH_REQUEST
|
|
|
|
writeUInt32BE(packet, userLen, ++p)
|
|
packet.utf8Write(username, (p += 4), userLen)
|
|
|
|
writeUInt32BE(packet, 14, (p += userLen))
|
|
packet.utf8Write('ssh-connection', (p += 4), 14)
|
|
|
|
writeUInt32BE(packet, 9, (p += 14))
|
|
packet.utf8Write('publickey', (p += 4), 9)
|
|
|
|
packet[(p += 9)] = 1
|
|
|
|
writeUInt32BE(packet, algoLen, ++p)
|
|
packet.utf8Write(keyAlgo, (p += 4), algoLen)
|
|
|
|
writeUInt32BE(packet, pubKeyLen, (p += algoLen))
|
|
packet.set(pubKey, (p += 4))
|
|
|
|
writeUInt32BE(packet, 4 + algoLen + 4 + sigLen, (p += pubKeyLen))
|
|
|
|
writeUInt32BE(packet, algoLen, (p += 4))
|
|
packet.utf8Write(keyAlgo, (p += 4), algoLen)
|
|
|
|
writeUInt32BE(packet, sigLen, (p += algoLen))
|
|
packet.set(signature, (p += 4))
|
|
|
|
// Servers shouldn't send packet type 60 in response to signed publickey
|
|
// attempts, but if they do, interpret as type 60.
|
|
this._authsQueue.push('publickey')
|
|
|
|
this._debug && this._debug('Outbound: Sending USERAUTH_REQUEST (publickey)')
|
|
sendPacket(this, this._packetRW.write.finalize(packet))
|
|
})
|
|
}
|
|
authHostbased(username, pubKey, hostname, userlocal, keyAlgo, cbSign) {
|
|
// TODO: Make DRY by sharing similar code with authPK()
|
|
if (this._server) throw new Error('Client-only method called in server mode')
|
|
|
|
pubKey = parseKey(pubKey)
|
|
if (pubKey instanceof Error) throw new Error('Invalid key')
|
|
|
|
const keyType = pubKey.type
|
|
pubKey = pubKey.getPublicSSH()
|
|
|
|
if (typeof keyAlgo === 'function') {
|
|
cbSign = keyAlgo
|
|
keyAlgo = undefined
|
|
}
|
|
if (!keyAlgo) keyAlgo = keyType
|
|
|
|
const userLen = Buffer.byteLength(username)
|
|
const algoLen = Buffer.byteLength(keyAlgo)
|
|
const pubKeyLen = pubKey.length
|
|
const sessionID = this._kex.sessionID
|
|
const sesLen = sessionID.length
|
|
const hostnameLen = Buffer.byteLength(hostname)
|
|
const userlocalLen = Buffer.byteLength(userlocal)
|
|
const data = Buffer.allocUnsafe(
|
|
4 +
|
|
sesLen +
|
|
1 +
|
|
4 +
|
|
userLen +
|
|
4 +
|
|
14 +
|
|
4 +
|
|
9 +
|
|
4 +
|
|
algoLen +
|
|
4 +
|
|
pubKeyLen +
|
|
4 +
|
|
hostnameLen +
|
|
4 +
|
|
userlocalLen
|
|
)
|
|
let p = 0
|
|
|
|
writeUInt32BE(data, sesLen, p)
|
|
data.set(sessionID, (p += 4))
|
|
|
|
data[(p += sesLen)] = MESSAGE.USERAUTH_REQUEST
|
|
|
|
writeUInt32BE(data, userLen, ++p)
|
|
data.utf8Write(username, (p += 4), userLen)
|
|
|
|
writeUInt32BE(data, 14, (p += userLen))
|
|
data.utf8Write('ssh-connection', (p += 4), 14)
|
|
|
|
writeUInt32BE(data, 9, (p += 14))
|
|
data.utf8Write('hostbased', (p += 4), 9)
|
|
|
|
writeUInt32BE(data, algoLen, (p += 9))
|
|
data.utf8Write(keyAlgo, (p += 4), algoLen)
|
|
|
|
writeUInt32BE(data, pubKeyLen, (p += algoLen))
|
|
data.set(pubKey, (p += 4))
|
|
|
|
writeUInt32BE(data, hostnameLen, (p += pubKeyLen))
|
|
data.utf8Write(hostname, (p += 4), hostnameLen)
|
|
|
|
writeUInt32BE(data, userlocalLen, (p += hostnameLen))
|
|
data.utf8Write(userlocal, (p += 4), userlocalLen)
|
|
|
|
cbSign(data, (signature) => {
|
|
signature = convertSignature(signature, keyType)
|
|
if (!signature) throw new Error('Error while converting handshake signature')
|
|
|
|
const sigLen = signature.length
|
|
const reqDataLen = data.length - sesLen - 4
|
|
p = this._packetRW.write.allocStart
|
|
const packet = this._packetRW.write.alloc(reqDataLen + 4 + 4 + algoLen + 4 + sigLen)
|
|
|
|
bufferCopy(data, packet, 4 + sesLen, data.length, p)
|
|
|
|
writeUInt32BE(packet, 4 + algoLen + 4 + sigLen, (p += reqDataLen))
|
|
writeUInt32BE(packet, algoLen, (p += 4))
|
|
packet.utf8Write(keyAlgo, (p += 4), algoLen)
|
|
writeUInt32BE(packet, sigLen, (p += algoLen))
|
|
packet.set(signature, (p += 4))
|
|
|
|
this._authsQueue.push('hostbased')
|
|
|
|
this._debug && this._debug('Outbound: Sending USERAUTH_REQUEST (hostbased)')
|
|
sendPacket(this, this._packetRW.write.finalize(packet))
|
|
})
|
|
}
|
|
authKeyboard(username) {
|
|
if (this._server) throw new Error('Client-only method called in server mode')
|
|
|
|
const userLen = Buffer.byteLength(username)
|
|
let p = this._packetRW.write.allocStart
|
|
const packet = this._packetRW.write.alloc(1 + 4 + userLen + 4 + 14 + 4 + 20 + 4 + 4)
|
|
|
|
packet[p] = MESSAGE.USERAUTH_REQUEST
|
|
|
|
writeUInt32BE(packet, userLen, ++p)
|
|
packet.utf8Write(username, (p += 4), userLen)
|
|
|
|
writeUInt32BE(packet, 14, (p += userLen))
|
|
packet.utf8Write('ssh-connection', (p += 4), 14)
|
|
|
|
writeUInt32BE(packet, 20, (p += 14))
|
|
packet.utf8Write('keyboard-interactive', (p += 4), 20)
|
|
|
|
writeUInt32BE(packet, 0, (p += 20))
|
|
|
|
writeUInt32BE(packet, 0, (p += 4))
|
|
|
|
this._authsQueue.push('keyboard-interactive')
|
|
|
|
this._debug && this._debug('Outbound: Sending USERAUTH_REQUEST (keyboard-interactive)')
|
|
sendPacket(this, this._packetRW.write.finalize(packet))
|
|
}
|
|
authNone(username) {
|
|
if (this._server) throw new Error('Client-only method called in server mode')
|
|
|
|
const userLen = Buffer.byteLength(username)
|
|
let p = this._packetRW.write.allocStart
|
|
const packet = this._packetRW.write.alloc(1 + 4 + userLen + 4 + 14 + 4 + 4)
|
|
|
|
packet[p] = MESSAGE.USERAUTH_REQUEST
|
|
|
|
writeUInt32BE(packet, userLen, ++p)
|
|
packet.utf8Write(username, (p += 4), userLen)
|
|
|
|
writeUInt32BE(packet, 14, (p += userLen))
|
|
packet.utf8Write('ssh-connection', (p += 4), 14)
|
|
|
|
writeUInt32BE(packet, 4, (p += 14))
|
|
packet.utf8Write('none', (p += 4), 4)
|
|
|
|
this._authsQueue.push('none')
|
|
|
|
this._debug && this._debug('Outbound: Sending USERAUTH_REQUEST (none)')
|
|
sendPacket(this, this._packetRW.write.finalize(packet))
|
|
}
|
|
authInfoRes(responses) {
|
|
if (this._server) throw new Error('Client-only method called in server mode')
|
|
|
|
let responsesTotalLen = 0
|
|
let responseLens
|
|
|
|
if (responses) {
|
|
responseLens = new Array(responses.length)
|
|
for (let i = 0; i < responses.length; ++i) {
|
|
const len = Buffer.byteLength(responses[i])
|
|
responseLens[i] = len
|
|
responsesTotalLen += 4 + len
|
|
}
|
|
}
|
|
|
|
let p = this._packetRW.write.allocStart
|
|
const packet = this._packetRW.write.alloc(1 + 4 + responsesTotalLen)
|
|
|
|
packet[p] = MESSAGE.USERAUTH_INFO_RESPONSE
|
|
|
|
if (responses) {
|
|
writeUInt32BE(packet, responses.length, ++p)
|
|
p += 4
|
|
for (let i = 0; i < responses.length; ++i) {
|
|
const len = responseLens[i]
|
|
writeUInt32BE(packet, len, p)
|
|
p += 4
|
|
if (len) {
|
|
packet.utf8Write(responses[i], p, len)
|
|
p += len
|
|
}
|
|
}
|
|
} else {
|
|
writeUInt32BE(packet, 0, ++p)
|
|
}
|
|
|
|
this._debug && this._debug('Outbound: Sending USERAUTH_INFO_RESPONSE')
|
|
sendPacket(this, this._packetRW.write.finalize(packet))
|
|
}
|
|
|
|
// 'ssh-connection' service-specific
|
|
// ---------------------------------
|
|
tcpipForward(bindAddr, bindPort, wantReply) {
|
|
if (this._server) throw new Error('Client-only method called in server mode')
|
|
|
|
const addrLen = Buffer.byteLength(bindAddr)
|
|
let p = this._packetRW.write.allocStart
|
|
const packet = this._packetRW.write.alloc(1 + 4 + 13 + 1 + 4 + addrLen + 4)
|
|
|
|
packet[p] = MESSAGE.GLOBAL_REQUEST
|
|
|
|
writeUInt32BE(packet, 13, ++p)
|
|
packet.utf8Write('tcpip-forward', (p += 4), 13)
|
|
|
|
packet[(p += 13)] = wantReply === undefined || wantReply === true ? 1 : 0
|
|
|
|
writeUInt32BE(packet, addrLen, ++p)
|
|
packet.utf8Write(bindAddr, (p += 4), addrLen)
|
|
|
|
writeUInt32BE(packet, bindPort, (p += addrLen))
|
|
|
|
this._debug && this._debug('Outbound: Sending GLOBAL_REQUEST (tcpip-forward)')
|
|
sendPacket(this, this._packetRW.write.finalize(packet))
|
|
}
|
|
cancelTcpipForward(bindAddr, bindPort, wantReply) {
|
|
if (this._server) throw new Error('Client-only method called in server mode')
|
|
|
|
const addrLen = Buffer.byteLength(bindAddr)
|
|
let p = this._packetRW.write.allocStart
|
|
const packet = this._packetRW.write.alloc(1 + 4 + 20 + 1 + 4 + addrLen + 4)
|
|
|
|
packet[p] = MESSAGE.GLOBAL_REQUEST
|
|
|
|
writeUInt32BE(packet, 20, ++p)
|
|
packet.utf8Write('cancel-tcpip-forward', (p += 4), 20)
|
|
|
|
packet[(p += 20)] = wantReply === undefined || wantReply === true ? 1 : 0
|
|
|
|
writeUInt32BE(packet, addrLen, ++p)
|
|
packet.utf8Write(bindAddr, (p += 4), addrLen)
|
|
|
|
writeUInt32BE(packet, bindPort, (p += addrLen))
|
|
|
|
this._debug && this._debug('Outbound: Sending GLOBAL_REQUEST (cancel-tcpip-forward)')
|
|
sendPacket(this, this._packetRW.write.finalize(packet))
|
|
}
|
|
openssh_streamLocalForward(socketPath, wantReply) {
|
|
if (this._server) throw new Error('Client-only method called in server mode')
|
|
|
|
const socketPathLen = Buffer.byteLength(socketPath)
|
|
let p = this._packetRW.write.allocStart
|
|
const packet = this._packetRW.write.alloc(1 + 4 + 31 + 1 + 4 + socketPathLen)
|
|
|
|
packet[p] = MESSAGE.GLOBAL_REQUEST
|
|
|
|
writeUInt32BE(packet, 31, ++p)
|
|
packet.utf8Write('[email protected]', (p += 4), 31)
|
|
|
|
packet[(p += 31)] = wantReply === undefined || wantReply === true ? 1 : 0
|
|
|
|
writeUInt32BE(packet, socketPathLen, ++p)
|
|
packet.utf8Write(socketPath, (p += 4), socketPathLen)
|
|
|
|
this._debug && this._debug('Outbound: Sending GLOBAL_REQUEST ([email protected])')
|
|
sendPacket(this, this._packetRW.write.finalize(packet))
|
|
}
|
|
openssh_cancelStreamLocalForward(socketPath, wantReply) {
|
|
if (this._server) throw new Error('Client-only method called in server mode')
|
|
|
|
const socketPathLen = Buffer.byteLength(socketPath)
|
|
let p = this._packetRW.write.allocStart
|
|
const packet = this._packetRW.write.alloc(1 + 4 + 38 + 1 + 4 + socketPathLen)
|
|
|
|
packet[p] = MESSAGE.GLOBAL_REQUEST
|
|
|
|
writeUInt32BE(packet, 38, ++p)
|
|
packet.utf8Write('[email protected]', (p += 4), 38)
|
|
|
|
packet[(p += 38)] = wantReply === undefined || wantReply === true ? 1 : 0
|
|
|
|
writeUInt32BE(packet, socketPathLen, ++p)
|
|
packet.utf8Write(socketPath, (p += 4), socketPathLen)
|
|
|
|
if (this._debug) {
|
|
this._debug('Outbound: Sending GLOBAL_REQUEST ' + '([email protected])')
|
|
}
|
|
sendPacket(this, this._packetRW.write.finalize(packet))
|
|
}
|
|
directTcpip(chan, initWindow, maxPacket, cfg) {
|
|
if (this._server) throw new Error('Client-only method called in server mode')
|
|
|
|
const srcLen = Buffer.byteLength(cfg.srcIP)
|
|
const dstLen = Buffer.byteLength(cfg.dstIP)
|
|
let p = this._packetRW.write.allocStart
|
|
const packet = this._packetRW.write.alloc(
|
|
1 + 4 + 12 + 4 + 4 + 4 + 4 + srcLen + 4 + 4 + dstLen + 4
|
|
)
|
|
|
|
packet[p] = MESSAGE.CHANNEL_OPEN
|
|
|
|
writeUInt32BE(packet, 12, ++p)
|
|
packet.utf8Write('direct-tcpip', (p += 4), 12)
|
|
|
|
writeUInt32BE(packet, chan, (p += 12))
|
|
|
|
writeUInt32BE(packet, initWindow, (p += 4))
|
|
|
|
writeUInt32BE(packet, maxPacket, (p += 4))
|
|
|
|
writeUInt32BE(packet, dstLen, (p += 4))
|
|
packet.utf8Write(cfg.dstIP, (p += 4), dstLen)
|
|
|
|
writeUInt32BE(packet, cfg.dstPort, (p += dstLen))
|
|
|
|
writeUInt32BE(packet, srcLen, (p += 4))
|
|
packet.utf8Write(cfg.srcIP, (p += 4), srcLen)
|
|
|
|
writeUInt32BE(packet, cfg.srcPort, (p += srcLen))
|
|
|
|
this._debug && this._debug(`Outbound: Sending CHANNEL_OPEN (r:${chan}, direct-tcpip)`)
|
|
sendPacket(this, this._packetRW.write.finalize(packet))
|
|
}
|
|
openssh_directStreamLocal(chan, initWindow, maxPacket, cfg) {
|
|
if (this._server) throw new Error('Client-only method called in server mode')
|
|
|
|
const pathLen = Buffer.byteLength(cfg.socketPath)
|
|
let p = this._packetRW.write.allocStart
|
|
const packet = this._packetRW.write.alloc(1 + 4 + 30 + 4 + 4 + 4 + 4 + pathLen + 4 + 4)
|
|
|
|
packet[p] = MESSAGE.CHANNEL_OPEN
|
|
|
|
writeUInt32BE(packet, 30, ++p)
|
|
packet.utf8Write('[email protected]', (p += 4), 30)
|
|
|
|
writeUInt32BE(packet, chan, (p += 30))
|
|
|
|
writeUInt32BE(packet, initWindow, (p += 4))
|
|
|
|
writeUInt32BE(packet, maxPacket, (p += 4))
|
|
|
|
writeUInt32BE(packet, pathLen, (p += 4))
|
|
packet.utf8Write(cfg.socketPath, (p += 4), pathLen)
|
|
|
|
// zero-fill reserved fields (string and uint32)
|
|
bufferFill(packet, 0, (p += pathLen), p + 8)
|
|
|
|
if (this._debug) {
|
|
this._debug('Outbound: Sending CHANNEL_OPEN ' + `(r:${chan}, [email protected])`)
|
|
}
|
|
sendPacket(this, this._packetRW.write.finalize(packet))
|
|
}
|
|
openssh_noMoreSessions(wantReply) {
|
|
if (this._server) throw new Error('Client-only method called in server mode')
|
|
|
|
let p = this._packetRW.write.allocStart
|
|
const packet = this._packetRW.write.alloc(1 + 4 + 28 + 1)
|
|
|
|
packet[p] = MESSAGE.GLOBAL_REQUEST
|
|
|
|
writeUInt32BE(packet, 28, ++p)
|
|
packet.utf8Write('[email protected]', (p += 4), 28)
|
|
|
|
packet[(p += 28)] = wantReply === undefined || wantReply === true ? 1 : 0
|
|
|
|
this._debug && this._debug('Outbound: Sending GLOBAL_REQUEST ([email protected])')
|
|
sendPacket(this, this._packetRW.write.finalize(packet))
|
|
}
|
|
session(chan, initWindow, maxPacket) {
|
|
if (this._server) throw new Error('Client-only method called in server mode')
|
|
|
|
// Does not consume window space
|
|
|
|
let p = this._packetRW.write.allocStart
|
|
const packet = this._packetRW.write.alloc(1 + 4 + 7 + 4 + 4 + 4)
|
|
|
|
packet[p] = MESSAGE.CHANNEL_OPEN
|
|
|
|
writeUInt32BE(packet, 7, ++p)
|
|
packet.utf8Write('session', (p += 4), 7)
|
|
|
|
writeUInt32BE(packet, chan, (p += 7))
|
|
|
|
writeUInt32BE(packet, initWindow, (p += 4))
|
|
|
|
writeUInt32BE(packet, maxPacket, (p += 4))
|
|
|
|
this._debug && this._debug(`Outbound: Sending CHANNEL_OPEN (r:${chan}, session)`)
|
|
sendPacket(this, this._packetRW.write.finalize(packet))
|
|
}
|
|
windowChange(chan, rows, cols, height, width) {
|
|
if (this._server) throw new Error('Client-only method called in server mode')
|
|
|
|
// Does not consume window space
|
|
|
|
let p = this._packetRW.write.allocStart
|
|
const packet = this._packetRW.write.alloc(1 + 4 + 4 + 13 + 1 + 4 + 4 + 4 + 4)
|
|
|
|
packet[p] = MESSAGE.CHANNEL_REQUEST
|
|
|
|
writeUInt32BE(packet, chan, ++p)
|
|
|
|
writeUInt32BE(packet, 13, (p += 4))
|
|
packet.utf8Write('window-change', (p += 4), 13)
|
|
|
|
packet[(p += 13)] = 0
|
|
|
|
writeUInt32BE(packet, cols, ++p)
|
|
|
|
writeUInt32BE(packet, rows, (p += 4))
|
|
|
|
writeUInt32BE(packet, width, (p += 4))
|
|
|
|
writeUInt32BE(packet, height, (p += 4))
|
|
|
|
this._debug && this._debug(`Outbound: Sending CHANNEL_REQUEST (r:${chan}, window-change)`)
|
|
sendPacket(this, this._packetRW.write.finalize(packet))
|
|
}
|
|
pty(chan, rows, cols, height, width, term, modes, wantReply) {
|
|
if (this._server) throw new Error('Client-only method called in server mode')
|
|
|
|
// Does not consume window space
|
|
|
|
if (!term || !term.length) term = 'vt100'
|
|
if (
|
|
modes &&
|
|
!Buffer.isBuffer(modes) &&
|
|
!Array.isArray(modes) &&
|
|
typeof modes === 'object' &&
|
|
modes !== null
|
|
) {
|
|
modes = modesToBytes(modes)
|
|
}
|
|
if (!modes || !modes.length) modes = NO_TERMINAL_MODES_BUFFER
|
|
|
|
const termLen = term.length
|
|
const modesLen = modes.length
|
|
let p = this._packetRW.write.allocStart
|
|
const packet = this._packetRW.write.alloc(
|
|
1 + 4 + 4 + 7 + 1 + 4 + termLen + 4 + 4 + 4 + 4 + 4 + modesLen
|
|
)
|
|
|
|
packet[p] = MESSAGE.CHANNEL_REQUEST
|
|
|
|
writeUInt32BE(packet, chan, ++p)
|
|
|
|
writeUInt32BE(packet, 7, (p += 4))
|
|
packet.utf8Write('pty-req', (p += 4), 7)
|
|
|
|
packet[(p += 7)] = wantReply === undefined || wantReply === true ? 1 : 0
|
|
|
|
writeUInt32BE(packet, termLen, ++p)
|
|
packet.utf8Write(term, (p += 4), termLen)
|
|
|
|
writeUInt32BE(packet, cols, (p += termLen))
|
|
|
|
writeUInt32BE(packet, rows, (p += 4))
|
|
|
|
writeUInt32BE(packet, width, (p += 4))
|
|
|
|
writeUInt32BE(packet, height, (p += 4))
|
|
|
|
writeUInt32BE(packet, modesLen, (p += 4))
|
|
p += 4
|
|
if (Array.isArray(modes)) {
|
|
for (let i = 0; i < modesLen; ++i) packet[p++] = modes[i]
|
|
} else if (Buffer.isBuffer(modes)) {
|
|
packet.set(modes, p)
|
|
}
|
|
|
|
this._debug && this._debug(`Outbound: Sending CHANNEL_REQUEST (r:${chan}, pty-req)`)
|
|
sendPacket(this, this._packetRW.write.finalize(packet))
|
|
}
|
|
shell(chan, wantReply) {
|
|
if (this._server) throw new Error('Client-only method called in server mode')
|
|
|
|
// Does not consume window space
|
|
|
|
let p = this._packetRW.write.allocStart
|
|
const packet = this._packetRW.write.alloc(1 + 4 + 4 + 5 + 1)
|
|
|
|
packet[p] = MESSAGE.CHANNEL_REQUEST
|
|
|
|
writeUInt32BE(packet, chan, ++p)
|
|
|
|
writeUInt32BE(packet, 5, (p += 4))
|
|
packet.utf8Write('shell', (p += 4), 5)
|
|
|
|
packet[(p += 5)] = wantReply === undefined || wantReply === true ? 1 : 0
|
|
|
|
this._debug && this._debug(`Outbound: Sending CHANNEL_REQUEST (r:${chan}, shell)`)
|
|
sendPacket(this, this._packetRW.write.finalize(packet))
|
|
}
|
|
exec(chan, cmd, wantReply) {
|
|
if (this._server) throw new Error('Client-only method called in server mode')
|
|
|
|
// Does not consume window space
|
|
|
|
const isBuf = Buffer.isBuffer(cmd)
|
|
const cmdLen = isBuf ? cmd.length : Buffer.byteLength(cmd)
|
|
let p = this._packetRW.write.allocStart
|
|
const packet = this._packetRW.write.alloc(1 + 4 + 4 + 4 + 1 + 4 + cmdLen)
|
|
|
|
packet[p] = MESSAGE.CHANNEL_REQUEST
|
|
|
|
writeUInt32BE(packet, chan, ++p)
|
|
|
|
writeUInt32BE(packet, 4, (p += 4))
|
|
packet.utf8Write('exec', (p += 4), 4)
|
|
|
|
packet[(p += 4)] = wantReply === undefined || wantReply === true ? 1 : 0
|
|
|
|
writeUInt32BE(packet, cmdLen, ++p)
|
|
if (isBuf) packet.set(cmd, (p += 4))
|
|
else packet.utf8Write(cmd, (p += 4), cmdLen)
|
|
|
|
this._debug && this._debug(`Outbound: Sending CHANNEL_REQUEST (r:${chan}, exec: ${cmd})`)
|
|
sendPacket(this, this._packetRW.write.finalize(packet))
|
|
}
|
|
signal(chan, signal) {
|
|
if (this._server) throw new Error('Client-only method called in server mode')
|
|
|
|
// Does not consume window space
|
|
|
|
const origSignal = signal
|
|
|
|
signal = signal.toUpperCase()
|
|
if (signal.slice(0, 3) === 'SIG') signal = signal.slice(3)
|
|
|
|
if (SIGNALS[signal] !== 1) throw new Error(`Invalid signal: ${origSignal}`)
|
|
|
|
const signalLen = signal.length
|
|
let p = this._packetRW.write.allocStart
|
|
const packet = this._packetRW.write.alloc(1 + 4 + 4 + 6 + 1 + 4 + signalLen)
|
|
|
|
packet[p] = MESSAGE.CHANNEL_REQUEST
|
|
|
|
writeUInt32BE(packet, chan, ++p)
|
|
|
|
writeUInt32BE(packet, 6, (p += 4))
|
|
packet.utf8Write('signal', (p += 4), 6)
|
|
|
|
packet[(p += 6)] = 0
|
|
|
|
writeUInt32BE(packet, signalLen, ++p)
|
|
packet.utf8Write(signal, (p += 4), signalLen)
|
|
|
|
this._debug && this._debug(`Outbound: Sending CHANNEL_REQUEST (r:${chan}, signal: ${signal})`)
|
|
sendPacket(this, this._packetRW.write.finalize(packet))
|
|
}
|
|
env(chan, key, val, wantReply) {
|
|
if (this._server) throw new Error('Client-only method called in server mode')
|
|
|
|
// Does not consume window space
|
|
|
|
const keyLen = Buffer.byteLength(key)
|
|
const isBuf = Buffer.isBuffer(val)
|
|
const valLen = isBuf ? val.length : Buffer.byteLength(val)
|
|
let p = this._packetRW.write.allocStart
|
|
const packet = this._packetRW.write.alloc(1 + 4 + 4 + 3 + 1 + 4 + keyLen + 4 + valLen)
|
|
|
|
packet[p] = MESSAGE.CHANNEL_REQUEST
|
|
|
|
writeUInt32BE(packet, chan, ++p)
|
|
|
|
writeUInt32BE(packet, 3, (p += 4))
|
|
packet.utf8Write('env', (p += 4), 3)
|
|
|
|
packet[(p += 3)] = wantReply === undefined || wantReply === true ? 1 : 0
|
|
|
|
writeUInt32BE(packet, keyLen, ++p)
|
|
packet.utf8Write(key, (p += 4), keyLen)
|
|
|
|
writeUInt32BE(packet, valLen, (p += keyLen))
|
|
if (isBuf) packet.set(val, (p += 4))
|
|
else packet.utf8Write(val, (p += 4), valLen)
|
|
|
|
this._debug && this._debug(`Outbound: Sending CHANNEL_REQUEST (r:${chan}, env: ${key}=${val})`)
|
|
sendPacket(this, this._packetRW.write.finalize(packet))
|
|
}
|
|
x11Forward(chan, cfg, wantReply) {
|
|
if (this._server) throw new Error('Client-only method called in server mode')
|
|
|
|
// Does not consume window space
|
|
|
|
const protocol = cfg.protocol
|
|
const cookie = cfg.cookie
|
|
const isBufProto = Buffer.isBuffer(protocol)
|
|
const protoLen = isBufProto ? protocol.length : Buffer.byteLength(protocol)
|
|
const isBufCookie = Buffer.isBuffer(cookie)
|
|
const cookieLen = isBufCookie ? cookie.length : Buffer.byteLength(cookie)
|
|
let p = this._packetRW.write.allocStart
|
|
const packet = this._packetRW.write.alloc(
|
|
1 + 4 + 4 + 7 + 1 + 1 + 4 + protoLen + 4 + cookieLen + 4
|
|
)
|
|
|
|
packet[p] = MESSAGE.CHANNEL_REQUEST
|
|
|
|
writeUInt32BE(packet, chan, ++p)
|
|
|
|
writeUInt32BE(packet, 7, (p += 4))
|
|
packet.utf8Write('x11-req', (p += 4), 7)
|
|
|
|
packet[(p += 7)] = wantReply === undefined || wantReply === true ? 1 : 0
|
|
|
|
packet[++p] = cfg.single ? 1 : 0
|
|
|
|
writeUInt32BE(packet, protoLen, ++p)
|
|
if (isBufProto) packet.set(protocol, (p += 4))
|
|
else packet.utf8Write(protocol, (p += 4), protoLen)
|
|
|
|
writeUInt32BE(packet, cookieLen, (p += protoLen))
|
|
if (isBufCookie) packet.set(cookie, (p += 4))
|
|
else packet.latin1Write(cookie, (p += 4), cookieLen)
|
|
|
|
writeUInt32BE(packet, cfg.screen || 0, (p += cookieLen))
|
|
|
|
this._debug && this._debug(`Outbound: Sending CHANNEL_REQUEST (r:${chan}, x11-req)`)
|
|
sendPacket(this, this._packetRW.write.finalize(packet))
|
|
}
|
|
subsystem(chan, name, wantReply) {
|
|
if (this._server) throw new Error('Client-only method called in server mode')
|
|
|
|
// Does not consume window space
|
|
const nameLen = Buffer.byteLength(name)
|
|
let p = this._packetRW.write.allocStart
|
|
const packet = this._packetRW.write.alloc(1 + 4 + 4 + 9 + 1 + 4 + nameLen)
|
|
|
|
packet[p] = MESSAGE.CHANNEL_REQUEST
|
|
|
|
writeUInt32BE(packet, chan, ++p)
|
|
|
|
writeUInt32BE(packet, 9, (p += 4))
|
|
packet.utf8Write('subsystem', (p += 4), 9)
|
|
|
|
packet[(p += 9)] = wantReply === undefined || wantReply === true ? 1 : 0
|
|
|
|
writeUInt32BE(packet, nameLen, ++p)
|
|
packet.utf8Write(name, (p += 4), nameLen)
|
|
|
|
this._debug && this._debug(`Outbound: Sending CHANNEL_REQUEST (r:${chan}, subsystem: ${name})`)
|
|
sendPacket(this, this._packetRW.write.finalize(packet))
|
|
}
|
|
openssh_agentForward(chan, wantReply) {
|
|
if (this._server) throw new Error('Client-only method called in server mode')
|
|
|
|
// Does not consume window space
|
|
|
|
let p = this._packetRW.write.allocStart
|
|
const packet = this._packetRW.write.alloc(1 + 4 + 4 + 26 + 1)
|
|
|
|
packet[p] = MESSAGE.CHANNEL_REQUEST
|
|
|
|
writeUInt32BE(packet, chan, ++p)
|
|
|
|
writeUInt32BE(packet, 26, (p += 4))
|
|
packet.utf8Write('[email protected]', (p += 4), 26)
|
|
|
|
packet[(p += 26)] = wantReply === undefined || wantReply === true ? 1 : 0
|
|
|
|
if (this._debug) {
|
|
this._debug('Outbound: Sending CHANNEL_REQUEST ' + `(r:${chan}, [email protected])`)
|
|
}
|
|
sendPacket(this, this._packetRW.write.finalize(packet))
|
|
}
|
|
openssh_hostKeysProve(keys) {
|
|
if (this._server) throw new Error('Client-only method called in server mode')
|
|
|
|
let keysTotal = 0
|
|
const publicKeys = []
|
|
for (const key of keys) {
|
|
const publicKey = key.getPublicSSH()
|
|
keysTotal += 4 + publicKey.length
|
|
publicKeys.push(publicKey)
|
|
}
|
|
|
|
let p = this._packetRW.write.allocStart
|
|
const packet = this._packetRW.write.alloc(1 + 4 + 29 + 1 + keysTotal)
|
|
|
|
packet[p] = MESSAGE.GLOBAL_REQUEST
|
|
|
|
writeUInt32BE(packet, 29, ++p)
|
|
packet.utf8Write('[email protected]', (p += 4), 29)
|
|
|
|
packet[(p += 29)] = 1 // want reply
|
|
|
|
++p
|
|
for (const buf of publicKeys) {
|
|
writeUInt32BE(packet, buf.length, p)
|
|
bufferCopy(buf, packet, 0, buf.length, (p += 4))
|
|
p += buf.length
|
|
}
|
|
|
|
if (this._debug) {
|
|
this._debug('Outbound: Sending GLOBAL_REQUEST ([email protected])')
|
|
}
|
|
sendPacket(this, this._packetRW.write.finalize(packet))
|
|
}
|
|
|
|
// ===========================================================================
|
|
// Server-specific ===========================================================
|
|
// ===========================================================================
|
|
|
|
// Global
|
|
// ------
|
|
serviceAccept(svcName) {
|
|
if (!this._server) throw new Error('Server-only method called in client mode')
|
|
|
|
const svcNameLen = Buffer.byteLength(svcName)
|
|
let p = this._packetRW.write.allocStart
|
|
const packet = this._packetRW.write.alloc(1 + 4 + svcNameLen)
|
|
|
|
packet[p] = MESSAGE.SERVICE_ACCEPT
|
|
|
|
writeUInt32BE(packet, svcNameLen, ++p)
|
|
packet.utf8Write(svcName, (p += 4), svcNameLen)
|
|
|
|
this._debug && this._debug(`Outbound: Sending SERVICE_ACCEPT (${svcName})`)
|
|
sendPacket(this, this._packetRW.write.finalize(packet))
|
|
|
|
if (this._server && this._banner && svcName === 'ssh-userauth') {
|
|
const banner = this._banner
|
|
this._banner = undefined // Prevent banner from being displayed again
|
|
const bannerLen = Buffer.byteLength(banner)
|
|
p = this._packetRW.write.allocStart
|
|
const packet = this._packetRW.write.alloc(1 + 4 + bannerLen + 4)
|
|
|
|
packet[p] = MESSAGE.USERAUTH_BANNER
|
|
|
|
writeUInt32BE(packet, bannerLen, ++p)
|
|
packet.utf8Write(banner, (p += 4), bannerLen)
|
|
|
|
writeUInt32BE(packet, 0, (p += bannerLen)) // Empty language tag
|
|
|
|
this._debug && this._debug('Outbound: Sending USERAUTH_BANNER')
|
|
sendPacket(this, this._packetRW.write.finalize(packet))
|
|
}
|
|
}
|
|
// 'ssh-connection' service-specific
|
|
forwardedTcpip(chan, initWindow, maxPacket, cfg) {
|
|
if (!this._server) throw new Error('Server-only method called in client mode')
|
|
|
|
const boundAddrLen = Buffer.byteLength(cfg.boundAddr)
|
|
const remoteAddrLen = Buffer.byteLength(cfg.remoteAddr)
|
|
let p = this._packetRW.write.allocStart
|
|
const packet = this._packetRW.write.alloc(
|
|
1 + 4 + 15 + 4 + 4 + 4 + 4 + boundAddrLen + 4 + 4 + remoteAddrLen + 4
|
|
)
|
|
|
|
packet[p] = MESSAGE.CHANNEL_OPEN
|
|
|
|
writeUInt32BE(packet, 15, ++p)
|
|
packet.utf8Write('forwarded-tcpip', (p += 4), 15)
|
|
|
|
writeUInt32BE(packet, chan, (p += 15))
|
|
|
|
writeUInt32BE(packet, initWindow, (p += 4))
|
|
|
|
writeUInt32BE(packet, maxPacket, (p += 4))
|
|
|
|
writeUInt32BE(packet, boundAddrLen, (p += 4))
|
|
packet.utf8Write(cfg.boundAddr, (p += 4), boundAddrLen)
|
|
|
|
writeUInt32BE(packet, cfg.boundPort, (p += boundAddrLen))
|
|
|
|
writeUInt32BE(packet, remoteAddrLen, (p += 4))
|
|
packet.utf8Write(cfg.remoteAddr, (p += 4), remoteAddrLen)
|
|
|
|
writeUInt32BE(packet, cfg.remotePort, (p += remoteAddrLen))
|
|
|
|
this._debug && this._debug(`Outbound: Sending CHANNEL_OPEN (r:${chan}, forwarded-tcpip)`)
|
|
sendPacket(this, this._packetRW.write.finalize(packet))
|
|
}
|
|
x11(chan, initWindow, maxPacket, cfg) {
|
|
if (!this._server) throw new Error('Server-only method called in client mode')
|
|
|
|
const addrLen = Buffer.byteLength(cfg.originAddr)
|
|
let p = this._packetRW.write.allocStart
|
|
const packet = this._packetRW.write.alloc(1 + 4 + 3 + 4 + 4 + 4 + 4 + addrLen + 4)
|
|
|
|
packet[p] = MESSAGE.CHANNEL_OPEN
|
|
|
|
writeUInt32BE(packet, 3, ++p)
|
|
packet.utf8Write('x11', (p += 4), 3)
|
|
|
|
writeUInt32BE(packet, chan, (p += 3))
|
|
|
|
writeUInt32BE(packet, initWindow, (p += 4))
|
|
|
|
writeUInt32BE(packet, maxPacket, (p += 4))
|
|
|
|
writeUInt32BE(packet, addrLen, (p += 4))
|
|
packet.utf8Write(cfg.originAddr, (p += 4), addrLen)
|
|
|
|
writeUInt32BE(packet, cfg.originPort, (p += addrLen))
|
|
|
|
this._debug && this._debug(`Outbound: Sending CHANNEL_OPEN (r:${chan}, x11)`)
|
|
sendPacket(this, this._packetRW.write.finalize(packet))
|
|
}
|
|
openssh_authAgent(chan, initWindow, maxPacket) {
|
|
if (!this._server) throw new Error('Server-only method called in client mode')
|
|
|
|
let p = this._packetRW.write.allocStart
|
|
const packet = this._packetRW.write.alloc(1 + 4 + 22 + 4 + 4 + 4)
|
|
|
|
packet[p] = MESSAGE.CHANNEL_OPEN
|
|
|
|
writeUInt32BE(packet, 22, ++p)
|
|
packet.utf8Write('[email protected]', (p += 4), 22)
|
|
|
|
writeUInt32BE(packet, chan, (p += 22))
|
|
|
|
writeUInt32BE(packet, initWindow, (p += 4))
|
|
|
|
writeUInt32BE(packet, maxPacket, (p += 4))
|
|
|
|
this._debug && this._debug(`Outbound: Sending CHANNEL_OPEN (r:${chan}, [email protected])`)
|
|
sendPacket(this, this._packetRW.write.finalize(packet))
|
|
}
|
|
openssh_forwardedStreamLocal(chan, initWindow, maxPacket, cfg) {
|
|
if (!this._server) throw new Error('Server-only method called in client mode')
|
|
|
|
const pathLen = Buffer.byteLength(cfg.socketPath)
|
|
let p = this._packetRW.write.allocStart
|
|
const packet = this._packetRW.write.alloc(1 + 4 + 33 + 4 + 4 + 4 + 4 + pathLen + 4)
|
|
|
|
packet[p] = MESSAGE.CHANNEL_OPEN
|
|
|
|
writeUInt32BE(packet, 33, ++p)
|
|
packet.utf8Write('[email protected]', (p += 4), 33)
|
|
|
|
writeUInt32BE(packet, chan, (p += 33))
|
|
|
|
writeUInt32BE(packet, initWindow, (p += 4))
|
|
|
|
writeUInt32BE(packet, maxPacket, (p += 4))
|
|
|
|
writeUInt32BE(packet, pathLen, (p += 4))
|
|
packet.utf8Write(cfg.socketPath, (p += 4), pathLen)
|
|
|
|
writeUInt32BE(packet, 0, (p += pathLen))
|
|
|
|
if (this._debug) {
|
|
this._debug(
|
|
'Outbound: Sending CHANNEL_OPEN ' + `(r:${chan}, [email protected])`
|
|
)
|
|
}
|
|
sendPacket(this, this._packetRW.write.finalize(packet))
|
|
}
|
|
exitStatus(chan, status) {
|
|
if (!this._server) throw new Error('Server-only method called in client mode')
|
|
|
|
// Does not consume window space
|
|
let p = this._packetRW.write.allocStart
|
|
const packet = this._packetRW.write.alloc(1 + 4 + 4 + 11 + 1 + 4)
|
|
|
|
packet[p] = MESSAGE.CHANNEL_REQUEST
|
|
|
|
writeUInt32BE(packet, chan, ++p)
|
|
|
|
writeUInt32BE(packet, 11, (p += 4))
|
|
packet.utf8Write('exit-status', (p += 4), 11)
|
|
|
|
packet[(p += 11)] = 0
|
|
|
|
writeUInt32BE(packet, status, ++p)
|
|
|
|
this._debug &&
|
|
this._debug(`Outbound: Sending CHANNEL_REQUEST (r:${chan}, exit-status: ${status})`)
|
|
sendPacket(this, this._packetRW.write.finalize(packet))
|
|
}
|
|
exitSignal(chan, name, coreDumped, msg) {
|
|
if (!this._server) throw new Error('Server-only method called in client mode')
|
|
|
|
// Does not consume window space
|
|
|
|
const origSignal = name
|
|
|
|
if (typeof origSignal !== 'string' || !origSignal)
|
|
throw new Error(`Invalid signal: ${origSignal}`)
|
|
|
|
let signal = name.toUpperCase()
|
|
if (signal.slice(0, 3) === 'SIG') signal = signal.slice(3)
|
|
|
|
if (SIGNALS[signal] !== 1) throw new Error(`Invalid signal: ${origSignal}`)
|
|
|
|
const nameLen = Buffer.byteLength(signal)
|
|
const msgLen = msg ? Buffer.byteLength(msg) : 0
|
|
let p = this._packetRW.write.allocStart
|
|
const packet = this._packetRW.write.alloc(1 + 4 + 4 + 11 + 1 + 4 + nameLen + 1 + 4 + msgLen + 4)
|
|
|
|
packet[p] = MESSAGE.CHANNEL_REQUEST
|
|
|
|
writeUInt32BE(packet, chan, ++p)
|
|
|
|
writeUInt32BE(packet, 11, (p += 4))
|
|
packet.utf8Write('exit-signal', (p += 4), 11)
|
|
|
|
packet[(p += 11)] = 0
|
|
|
|
writeUInt32BE(packet, nameLen, ++p)
|
|
packet.utf8Write(signal, (p += 4), nameLen)
|
|
|
|
packet[(p += nameLen)] = coreDumped ? 1 : 0
|
|
|
|
writeUInt32BE(packet, msgLen, ++p)
|
|
|
|
p += 4
|
|
if (msgLen) {
|
|
packet.utf8Write(msg, p, msgLen)
|
|
p += msgLen
|
|
}
|
|
|
|
writeUInt32BE(packet, 0, p)
|
|
|
|
this._debug &&
|
|
this._debug(`Outbound: Sending CHANNEL_REQUEST (r:${chan}, exit-signal: ${name})`)
|
|
sendPacket(this, this._packetRW.write.finalize(packet))
|
|
}
|
|
// 'ssh-userauth' service-specific
|
|
authFailure(authMethods, isPartial) {
|
|
if (!this._server) throw new Error('Server-only method called in client mode')
|
|
|
|
if (this._authsQueue.length === 0) throw new Error('No auth in progress')
|
|
|
|
let methods
|
|
|
|
if (typeof authMethods === 'boolean') {
|
|
isPartial = authMethods
|
|
authMethods = undefined
|
|
}
|
|
|
|
if (authMethods) {
|
|
methods = []
|
|
for (let i = 0; i < authMethods.length; ++i) {
|
|
if (authMethods[i].toLowerCase() === 'none') continue
|
|
methods.push(authMethods[i])
|
|
}
|
|
methods = methods.join(',')
|
|
} else {
|
|
methods = ''
|
|
}
|
|
|
|
const methodsLen = methods.length
|
|
let p = this._packetRW.write.allocStart
|
|
const packet = this._packetRW.write.alloc(1 + 4 + methodsLen + 1)
|
|
|
|
packet[p] = MESSAGE.USERAUTH_FAILURE
|
|
|
|
writeUInt32BE(packet, methodsLen, ++p)
|
|
packet.utf8Write(methods, (p += 4), methodsLen)
|
|
|
|
packet[(p += methodsLen)] = isPartial === true ? 1 : 0
|
|
|
|
this._authsQueue.shift()
|
|
|
|
this._debug && this._debug('Outbound: Sending USERAUTH_FAILURE')
|
|
sendPacket(this, this._packetRW.write.finalize(packet))
|
|
}
|
|
authSuccess() {
|
|
if (!this._server) throw new Error('Server-only method called in client mode')
|
|
|
|
if (this._authsQueue.length === 0) throw new Error('No auth in progress')
|
|
|
|
const p = this._packetRW.write.allocStart
|
|
const packet = this._packetRW.write.alloc(1)
|
|
|
|
packet[p] = MESSAGE.USERAUTH_SUCCESS
|
|
|
|
this._authsQueue.shift()
|
|
this._authenticated = true
|
|
|
|
this._debug && this._debug('Outbound: Sending USERAUTH_SUCCESS')
|
|
sendPacket(this, this._packetRW.write.finalize(packet))
|
|
|
|
if (this._kex.negotiated.cs.compress === '[email protected]')
|
|
this._packetRW.read = new ZlibPacketReader()
|
|
if (this._kex.negotiated.sc.compress === '[email protected]')
|
|
this._packetRW.write = new ZlibPacketWriter(this)
|
|
}
|
|
authPKOK(keyAlgo, key) {
|
|
if (!this._server) throw new Error('Server-only method called in client mode')
|
|
|
|
if (this._authsQueue.length === 0 || this._authsQueue[0] !== 'publickey')
|
|
throw new Error('"publickey" auth not in progress')
|
|
|
|
// TODO: support parsed key for `key`
|
|
|
|
const keyAlgoLen = Buffer.byteLength(keyAlgo)
|
|
const keyLen = key.length
|
|
let p = this._packetRW.write.allocStart
|
|
const packet = this._packetRW.write.alloc(1 + 4 + keyAlgoLen + 4 + keyLen)
|
|
|
|
packet[p] = MESSAGE.USERAUTH_PK_OK
|
|
|
|
writeUInt32BE(packet, keyAlgoLen, ++p)
|
|
packet.utf8Write(keyAlgo, (p += 4), keyAlgoLen)
|
|
|
|
writeUInt32BE(packet, keyLen, (p += keyAlgoLen))
|
|
packet.set(key, (p += 4))
|
|
|
|
this._authsQueue.shift()
|
|
|
|
this._debug && this._debug('Outbound: Sending USERAUTH_PK_OK')
|
|
sendPacket(this, this._packetRW.write.finalize(packet))
|
|
}
|
|
authPasswdChg(prompt) {
|
|
if (!this._server) throw new Error('Server-only method called in client mode')
|
|
|
|
const promptLen = Buffer.byteLength(prompt)
|
|
let p = this._packetRW.write.allocStart
|
|
const packet = this._packetRW.write.alloc(1 + 4 + promptLen + 4)
|
|
|
|
packet[p] = MESSAGE.USERAUTH_PASSWD_CHANGEREQ
|
|
|
|
writeUInt32BE(packet, promptLen, ++p)
|
|
packet.utf8Write(prompt, (p += 4), promptLen)
|
|
|
|
writeUInt32BE(packet, 0, (p += promptLen)) // Empty language tag
|
|
|
|
this._debug && this._debug('Outbound: Sending USERAUTH_PASSWD_CHANGEREQ')
|
|
sendPacket(this, this._packetRW.write.finalize(packet))
|
|
}
|
|
authInfoReq(name, instructions, prompts) {
|
|
if (!this._server) throw new Error('Server-only method called in client mode')
|
|
|
|
let promptsLen = 0
|
|
const nameLen = name ? Buffer.byteLength(name) : 0
|
|
const instrLen = instructions ? Buffer.byteLength(instructions) : 0
|
|
|
|
for (let i = 0; i < prompts.length; ++i)
|
|
promptsLen += 4 + Buffer.byteLength(prompts[i].prompt) + 1
|
|
|
|
let p = this._packetRW.write.allocStart
|
|
const packet = this._packetRW.write.alloc(1 + 4 + nameLen + 4 + instrLen + 4 + 4 + promptsLen)
|
|
|
|
packet[p] = MESSAGE.USERAUTH_INFO_REQUEST
|
|
|
|
writeUInt32BE(packet, nameLen, ++p)
|
|
p += 4
|
|
if (name) {
|
|
packet.utf8Write(name, p, nameLen)
|
|
p += nameLen
|
|
}
|
|
|
|
writeUInt32BE(packet, instrLen, p)
|
|
p += 4
|
|
if (instructions) {
|
|
packet.utf8Write(instructions, p, instrLen)
|
|
p += instrLen
|
|
}
|
|
|
|
writeUInt32BE(packet, 0, p)
|
|
|
|
writeUInt32BE(packet, prompts.length, (p += 4))
|
|
p += 4
|
|
for (let i = 0; i < prompts.length; ++i) {
|
|
const prompt = prompts[i]
|
|
const promptLen = Buffer.byteLength(prompt.prompt)
|
|
|
|
writeUInt32BE(packet, promptLen, p)
|
|
p += 4
|
|
if (promptLen) {
|
|
packet.utf8Write(prompt.prompt, p, promptLen)
|
|
p += promptLen
|
|
}
|
|
packet[p++] = prompt.echo ? 1 : 0
|
|
}
|
|
|
|
this._debug && this._debug('Outbound: Sending USERAUTH_INFO_REQUEST')
|
|
sendPacket(this, this._packetRW.write.finalize(packet))
|
|
}
|
|
}
|
|
|
|
// SSH-protoversion-softwareversion (SP comments) CR LF
|
|
const RE_IDENT = /^SSH-(2\.0|1\.99)-([^ ]+)(?: (.*))?$/
|
|
|
|
// TODO: optimize this by starting n bytes from the end of this._buffer instead
|
|
// of the beginning
|
|
function parseHeader(chunk, p, len) {
|
|
let data
|
|
let chunkOffset
|
|
if (this._buffer) {
|
|
data = Buffer.allocUnsafe(this._buffer.length + (len - p))
|
|
data.set(this._buffer, 0)
|
|
if (p === 0) {
|
|
data.set(chunk, this._buffer.length)
|
|
} else {
|
|
data.set(new Uint8Array(chunk.buffer, chunk.byteOffset + p, len - p), this._buffer.length)
|
|
}
|
|
chunkOffset = this._buffer.length
|
|
p = 0
|
|
} else {
|
|
data = chunk
|
|
chunkOffset = 0
|
|
}
|
|
const op = p
|
|
let start = p
|
|
let end = p
|
|
let needNL = false
|
|
let lineLen = 0
|
|
let lines = 0
|
|
for (; p < data.length; ++p) {
|
|
const ch = data[p]
|
|
|
|
if (ch === 13 /* '\r' */) {
|
|
needNL = true
|
|
continue
|
|
}
|
|
|
|
if (ch === 10 /* '\n' */) {
|
|
if (
|
|
end > start &&
|
|
end - start > 4 &&
|
|
data[start] === 83 /* 'S' */ &&
|
|
data[start + 1] === 83 /* 'S' */ &&
|
|
data[start + 2] === 72 /* 'H' */ &&
|
|
data[start + 3] === 45 /* '-' */
|
|
) {
|
|
const full = data.toString('latin1', op, end + 1)
|
|
const identRaw = start === op ? full : full.slice(start - op)
|
|
const m = RE_IDENT.exec(identRaw)
|
|
if (!m) throw new Error('Invalid identification string')
|
|
|
|
const header = {
|
|
greeting: start === op ? '' : full.slice(0, start - op),
|
|
identRaw,
|
|
versions: {
|
|
protocol: m[1],
|
|
software: m[2]
|
|
},
|
|
comments: m[3]
|
|
}
|
|
|
|
// Needed during handshake
|
|
this._remoteIdentRaw = Buffer.from(identRaw)
|
|
|
|
this._debug && this._debug(`Remote ident: ${inspect(identRaw)}`)
|
|
this._compatFlags = getCompatFlags(header)
|
|
|
|
this._buffer = undefined
|
|
this._decipher = new NullDecipher(0, onKEXPayload.bind(this, { firstPacket: true }))
|
|
this._parse = parsePacket
|
|
|
|
this._onHeader(header)
|
|
if (!this._destruct) {
|
|
// We disconnected inside _onHeader
|
|
return len
|
|
}
|
|
|
|
kexinit(this)
|
|
|
|
return p + 1 - chunkOffset
|
|
}
|
|
|
|
// Only allow pre-ident greetings when we're a client
|
|
if (this._server) throw new Error('Greetings from clients not permitted')
|
|
|
|
if (++lines > MAX_LINES) throw new Error('Max greeting lines exceeded')
|
|
|
|
needNL = false
|
|
start = p + 1
|
|
lineLen = 0
|
|
} else if (needNL) {
|
|
throw new Error('Invalid header: expected newline')
|
|
} else if (++lineLen >= MAX_LINE_LEN) {
|
|
throw new Error('Header line too long')
|
|
}
|
|
|
|
end = p
|
|
}
|
|
if (!this._buffer) this._buffer = bufferSlice(data, op)
|
|
|
|
return p - chunkOffset
|
|
}
|
|
|
|
function parsePacket(chunk, p, len) {
|
|
return this._decipher.decrypt(chunk, p, len)
|
|
}
|
|
|
|
function onPayload(payload) {
|
|
// XXX: move this to the Decipher implementations?
|
|
|
|
this._onPacket()
|
|
|
|
if (payload.length === 0) {
|
|
this._debug && this._debug('Inbound: Skipping empty packet payload')
|
|
return
|
|
}
|
|
|
|
payload = this._packetRW.read.read(payload)
|
|
|
|
const type = payload[0]
|
|
if (type === MESSAGE.USERAUTH_SUCCESS && !this._server && !this._authenticated) {
|
|
this._authenticated = true
|
|
if (this._kex.negotiated.cs.compress === '[email protected]')
|
|
this._packetRW.write = new ZlibPacketWriter(this)
|
|
if (this._kex.negotiated.sc.compress === '[email protected]')
|
|
this._packetRW.read = new ZlibPacketReader()
|
|
}
|
|
const handler = MESSAGE_HANDLERS[type]
|
|
if (handler === undefined) {
|
|
this._debug && this._debug(`Inbound: Unsupported message type: ${type}`)
|
|
return
|
|
}
|
|
|
|
return handler(this, payload)
|
|
}
|
|
|
|
function getCompatFlags(header) {
|
|
const software = header.versions.software
|
|
|
|
let flags = 0
|
|
|
|
for (const rule of COMPAT_CHECKS) {
|
|
if (typeof rule[0] === 'string') {
|
|
if (software === rule[0]) flags |= rule[1]
|
|
} else if (rule[0].test(software)) {
|
|
flags |= rule[1]
|
|
}
|
|
}
|
|
|
|
return flags
|
|
}
|
|
|
|
function modesToBytes(modes) {
|
|
const keys = Object.keys(modes)
|
|
const bytes = Buffer.allocUnsafe(5 * keys.length + 1)
|
|
let b = 0
|
|
|
|
for (let i = 0; i < keys.length; ++i) {
|
|
const key = keys[i]
|
|
if (key === 'TTY_OP_END') continue
|
|
|
|
const opcode = TERMINAL_MODE[key]
|
|
if (opcode === undefined) continue
|
|
|
|
const val = modes[key]
|
|
if (typeof val === 'number' && isFinite(val)) {
|
|
bytes[b++] = opcode
|
|
bytes[b++] = val >>> 24
|
|
bytes[b++] = val >>> 16
|
|
bytes[b++] = val >>> 8
|
|
bytes[b++] = val
|
|
}
|
|
}
|
|
|
|
bytes[b++] = TERMINAL_MODE.TTY_OP_END
|
|
|
|
if (b < bytes.length) return bufferSlice(bytes, 0, b)
|
|
|
|
return bytes
|
|
}
|
|
|
|
function sendExtInfo(proto) {
|
|
let serverSigAlgs =
|
|
'ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521' +
|
|
'rsa-sha2-512,rsa-sha2-256,ssh-rsa,ssh-dss'
|
|
if (eddsaSupported) serverSigAlgs = `ssh-ed25519,${serverSigAlgs}`
|
|
const algsLen = Buffer.byteLength(serverSigAlgs)
|
|
|
|
let p = proto._packetRW.write.allocStart
|
|
const packet = proto._packetRW.write.alloc(1 + 4 + 4 + 15 + 4 + algsLen)
|
|
|
|
packet[p] = MESSAGE.EXT_INFO
|
|
|
|
writeUInt32BE(packet, 1, ++p)
|
|
|
|
writeUInt32BE(packet, 15, (p += 4))
|
|
packet.utf8Write('server-sig-algs', (p += 4), 15)
|
|
|
|
writeUInt32BE(packet, algsLen, (p += 15))
|
|
packet.utf8Write(serverSigAlgs, (p += 4), algsLen)
|
|
|
|
proto._debug && proto._debug('Outbound: Sending EXT_INFO')
|
|
sendPacket(proto, proto._packetRW.write.finalize(packet))
|
|
}
|
|
|
|
module.exports = Protocol
|