/
Connection.js
2623 lines (2370 loc) · 85.6 KB
/
Connection.js
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var Socket = require('net').Socket,
zlib = require('zlib'),
crypto = require('crypto'),
inherits = require('util').inherits,
EventEmitter = require('events').EventEmitter,
inspect = require('util').inspect,
Ber = require('asn1').Ber;
var Parser = require('./Parser'),
consts = require('./Parser.constants'),
keyParser = require('./keyParser'),
Channel = require('./Channel'),
agentQuery = require('./agent'),
SFTPv3 = require('./SFTP/SFTPv3'),
isStreamCipher = require('./utils').isStreamCipher,
isGCM = require('./utils').isGCM,
iv_inc = require('./utils').iv_inc;
var MODULE_VER = require('../package.json').version,
SSH_IDENT = 'SSH-2.0-ssh2js' + MODULE_VER,
MAX_CHANNEL = Math.pow(2, 32) - 1,
RE_SHA1 = /^group|gex-sha1$/i,
ALGORITHMS = consts.ALGORITHMS,
MESSAGE = consts.MESSAGE,
SSH_TO_OPENSSL = consts.SSH_TO_OPENSSL,
DISCONNECT_REASON = consts.DISCONNECT_REASON,
CHANNEL_OPEN_FAILURE = consts.CHANNEL_OPEN_FAILURE,
EMPTY_BUFFER = new Buffer(0),
PING_PACKET = new Buffer([MESSAGE.IGNORE, 0, 0, 0, 0]),
AUTO_KB_PACKET = new Buffer([consts.USERAUTH_INFO_RESPONSE, 0, 0, 0, 0]),
NEWKEYS_PACKET = new Buffer([MESSAGE.NEWKEYS]),
KEXDH_GEX_REQ_PACKET = new Buffer([
consts.KEXDH_GEX_REQUEST,
// minimal size in bits of an acceptable group
0, 0, 4, 0, // 1024, modp2
// preferred size in bits of the group the server will send
0, 0, 10, 0, // 4096, modp16
// maximal size in bits of an acceptable group
0, 0, 20, 0 // 8192, modp18
]);
function Connection(opts) {
if (!(this instanceof Connection))
return new Connection(opts);
var self = this;
this._host = undefined;
this._port = undefined;
this._compress = false;
this._state = 'closed';
this._username = undefined;
this._password = undefined;
this._privateKey = undefined;
this._publicKey = undefined;
this._tryKeyboard = undefined;
this._fingerprint = undefined;
this._cbfingerprint = undefined;
this._agent = undefined;
this._pingInterval = undefined;
this._readyTimeout = undefined;
this._debug = undefined;
this._sock = undefined;
this._channels = undefined;
this._callbacks = undefined;
this._forwarding = undefined;
this._acceptX11 = 0;
this._allowAgentFwd = false;
this._agentFwded = false;
this._buffer = undefined;
this._agentKeys = undefined;
this._seqno = 0;
this._bufseqno = new Buffer(4);
this._encryptSize = 8;
this._encrypt = false;
this._hmacKey = undefined;
this._hmacSize = undefined;
this._hmac = false;
this._server_ident_raw = undefined;
this._kexinit = undefined;
this._kexsecret = undefined;
this._kexdh = undefined;
this._sessionid = undefined;
this._curChan = -1;
this._parser = new Parser();
this._parser.on('error', function(err) {
err.level = 'parser';
self.emit('error', err);
});
this._parser.on('header', function(header) {
if (header.versions.protocol !== '1.99'
&& header.versions.protocol !== '2.0') {
self._parser.reset();
return self.destroy();
}
self._debug && self._debug('DEBUG: Connection: Server ident: '
+ inspect(header.ident_raw));
self._server_ident_raw = header.ident_raw;
sendKEXInit(self);
});
this._parser.on('DEBUG', function(message, lang) {
if (self._debug) {
self._debug('DEBUG: Connection: Debug message from server: '
+ inspect(message));
self.emit('debug', message);
}
});
this._parser.on('KEXINIT', function(init) {
onKEXINIT(self, init);
});
this._parser.on('KEXDH_REPLY', function(info) {
onKEXDH_REPLY(self, info);
});
this._parser.on('KEXDH_GEX_GROUP', function(prime, gen) {
onKEXDH_GEX_GROUP(self, prime, gen);
});
this._parser.on('NEWKEYS', function() {
onNEWKEYS(self);
});
this._parser.on('SERVICE_ACCEPT', function(svc) {
onSERVICE_ACCEPT(self, svc);
});
this._parser.on('USERAUTH_SUCCESS', function() {
onUSERAUTH_SUCCESS(self);
});
this._parser.on('USERAUTH_FAILURE', function(auths, partial) {
onUSERAUTH_FAILURE(self, auths, partial);
});
this._parser.on('USERAUTH_BANNER', function(message, lang) {
// the server sent us a notice/banner of some kind for the user to read
// before attempting to log in, usually a legal notice or some such
self.emit('banner', message, lang);
});
this._parser.on('USERAUTH_PASSWD_CHANGEREQ', function(message, lang) {
onUSERAUTH_PASSWD_CHANGEREQ(self, message, lang);
});
this._parser.on('USERAUTH_INFO_REQUEST', function(name, inst, lang, prompts) {
onUSERAUTH_INFO_REQUEST(self, name, inst, lang, prompts);
});
this._parser.on('USERAUTH_PK_OK', function() {
// server says our public key is permitted for user authentication, so
// continue on with real user authentication request
// (signing data with private key)
self._authPK(true);
});
this._parser.on('REQUEST_SUCCESS', function(data) {
// general success response -- one of two replies sent when a packet's
// "want_reply" is set to true
if (self._callbacks.length)
self._callbacks.shift()(false, data);
});
this._parser.on('REQUEST_FAILURE', function() {
// general failure response -- one of two replies sent when a packet's
// "want_reply" is set to true
if (self._callbacks.length)
self._callbacks.shift()(true);
});
this._parser.on('CHANNEL_OPEN', function(info) {
onCHANNEL_OPEN(self, info);
});
this._parser.on('DISCONNECT', function(reason, reasonCode, desc, lang) {
var msg = 'Disconnected by host (' + reason + ')', err;
if (desc.length)
msg += ': ' + desc;
err = new Error(msg);
err.level = 'connection-ssh';
if (desc.length) {
err.description = desc;
err.lang = lang;
}
self.emit('error', err);
self._sock.end();
});
}
inherits(Connection, EventEmitter);
Connection.prototype.connect = function(opts) {
var self = this;
if (this._state !== 'closed') {
this.once('close', function() {
self.connect(opts);
});
this.end();
return;
}
var passphrase = opts.passphrase;
this._host = opts.host || 'localhost';
this._port = opts.port || 22;
this._compress = opts.compress || false;
this._state = 'connecting';
this._username = opts.username;
this._password = opts.password;
this._privateKey = opts.privateKey;
this._publicKey = opts.publicKey;
this._tryKeyboard = opts.tryKeyboard;
this._fingerprint = opts.hostHash;
this._cbfingerprint = opts.hostVerifier;
this._agent = opts.agent;
this._pingInterval = opts.pingInterval;
this._allowAgentFwd = ((opts.agentForward === true
&& typeof opts.agent === 'string'
&& opts.agent) ? true : false);
if (opts.agentForward === true && !this._allowAgentFwd)
throw new Error('You must set a valid agent path to allow agent forwarding');
this._readyTimeout = setTimeout(function() {
if (self._state !== 'authenticated' && self._state !== 'reexchg') {
var err = new Error('Timed out while waiting for handshake')
err.level = 'connection-timeout';
self.emit('error', err);
self.destroy();
}
}, (typeof opts.readyTimeout === 'number' ? opts.readyTimeout : 10000));
this._debug = (typeof opts.debug === 'function' ? opts.debug : undefined);
this._parser.debug = this._debug;
if (this._pingInterval === undefined
|| (typeof this._pingInterval === 'number' && this._pingInterval < 0))
this._pingInterval = 60000;
opts.sock && process.nextTick(function() { opts.sock.emit('connect'); });
this._sock = (opts.sock ? opts.sock : new Socket());
this._channels = [];
this._buffer = [];
this._callbacks = [];
this._forwarding = [];
this._acceptX11 = 0;
this._auths = { methods: undefined, partial: undefined, triedNone: false };
this._agentKeys = undefined;
this._seqno = 0;
this._encryptSize = 8;
this._encrypt = false;
this._hmacKey = undefined;
this._hmacSize = undefined;
this._hmac = false;
this._server_ident_raw = undefined;
this._kexinit = undefined;
this._kexsecret = undefined;
this._kexdh = undefined;
this._sessionid = undefined;
this._pinger = undefined;
this._curChan = -1;
this._agentFwded = false;
this._parser.reset();
// drain stderr if we are connection hopping using an exec stream
if (this._sock.stderr)
this._sock.stderr.resume();
if (this._fingerprint !== undefined && this._fingerprint !== 'md5'
&& this._fingerprint !== 'sha1')
throw new Error("hostHash must be 'sha1' or 'md5'");
if (this._fingerprint && typeof this._cbfingerprint !== 'function')
throw new Error('hostVerifier is not a function');
var keyInfo;
if (this._privateKey) {
keyInfo = keyParser(this._privateKey);
if (keyInfo instanceof Error)
throw new Error('Cannot parse privateKey: ' + keyInfo.message);
if (!keyInfo.private)
throw new Error('privateKey value does not contain a (valid) private key');
if (keyInfo.encryption) {
if (typeof passphrase !== 'string')
throw new Error('Encrypted private key detected, but no passphrase given');
// perform one-time decryption of private key
keyInfo.encryption = (SSH_TO_OPENSSL[keyInfo.encryption]
|| keyInfo.encryption);
var iv = new Buffer(keyInfo.extra[0], 'hex'),
key, keylen = 0;
switch (keyInfo.encryption) {
case 'aes-256-cbc':
case 'aes-256-ctr':
keylen = 32; // eg. 256 / 8
break;
case 'des-ede3-cbc':
case 'des-ede3':
case 'aes-192-cbc':
case 'aes-192-ctr':
keylen = 24; // eg. 192 / 8
break;
case 'aes-128-cbc':
case 'aes-128-ctr':
case 'cast-cbc':
case 'bf-cbc':
keylen = 16; // eg. 128 / 8
break;
}
key = new Buffer(crypto.createHash('md5')
.update(passphrase
+ iv.toString('binary', 0, 8), 'binary')
.digest('binary'), 'binary');
while (keylen > key.length) {
key = Buffer.concat([
key,
new Buffer(crypto.createHash('md5')
.update(key.toString('binary')
+ passphrase
+ iv.toString('binary'), 'binary')
.digest('binary'), 'binary').slice(0, 8)
]);
}
if (key.length > keylen)
key = key.slice(0, keylen);
var dc = crypto.createDecipheriv(keyInfo.encryption, key, iv),
out;
dc.setAutoPadding(false);
out = dc.update(keyInfo.private, 'binary', 'binary');
out += dc.final('binary');
// update our original base64-encoded version of the private key
var orig = keyInfo.privateOrig.toString('utf8'),
newOrig = /^(.+(?:\r\n|\n))/.exec(orig)[1],
b64key = new Buffer(out, 'binary').toString('base64');
newOrig += b64key.match(/.{1,70}/g).join('\n');
newOrig += /((?:\r\n|\n).+)$/.exec(orig)[1];
keyInfo.private = new Buffer(out, 'binary');
keyInfo.privateOrig = newOrig;
}
this._privateKey = keyInfo;
if (keyInfo.public)
this._publicKey = keyInfo;
}
if (this._privateKey && !this._privateKey.public) {
// parsing the supplied private key data did not yield a public key
// (only PuTTY ppk files contain both private and public keys)
if (this._publicKey) {
// a public key was explicitly supplied
keyInfo = keyParser(this._publicKey);
if (keyInfo instanceof Error)
throw new Error('Cannot parse publicKey: ' + keyInfo.message);
if (!keyInfo.public)
throw new Error('publicKey value does not contain a (valid) public key');
if (keyInfo.type !== this._privateKey.type)
throw new Error('Mismatched private and public key types');
} else {
// parsing private key in ASN.1 format in order to generate a public key
var i = 2, len, octets,
privKey = this._privateKey.private,
nStart, nLen, eStart, eLen, // RSA
pStart, pLen, qStart, qLen, gStart, gLen, yStart, yLen; // DSA
if (privKey[0] === 0x30) {
if (privKey[1] & 0x80)
i += (privKey[1] & 0x7F);
// version -- integer
if (privKey[i++] !== 0x02) {
throw new Error('Unable to parse private key while generating public'
+ ' key (expected integer for version)');
}
len = privKey[i++];
if (len & 0x80) {
octets = len & 0x7F;
len = 0;
while (octets > 0) {
len += (privKey[i++] * Math.pow(2, (octets - 1) * 8));
--octets;
}
}
i += len; // skip version value
if (this._privateKey.type === 'rsa') {
// modulus (n) -- integer
if (privKey[i++] !== 0x02) {
throw new Error('Unable to parse private key while generating public'
+ ' key (expected integer for n)');
}
nLen = privKey[i++];
if (nLen & 0x80) {
octets = nLen & 0x7F;
nLen = 0;
while (octets > 0) {
nLen += (privKey[i++] * Math.pow(2, (octets - 1) * 8));
--octets;
}
}
nStart = i;
i += nLen;
// public exponent (e) -- integer
if (privKey[i++] !== 0x02) {
throw new Error('Unable to parse private key while generating public'
+ ' key (expected integer for e)');
}
eLen = privKey[i++];
if (eLen & 0x80) {
octets = eLen & 0x7F;
eLen = 0;
while (octets > 0) {
eLen += (privKey[i++] * Math.pow(2, (octets - 1) * 8));
--octets;
}
}
eStart = i;
} else { // DSA
// prime (p) -- integer
if (privKey[i++] !== 0x02) {
throw new Error('Unable to parse private key while generating public'
+ ' key (expected integer for p)');
}
pLen = privKey[i++];
if (pLen & 0x80) {
octets = pLen & 0x7F;
pLen = 0;
while (octets > 0) {
pLen += (privKey[i++] * Math.pow(2, (octets - 1) * 8));
--octets;
}
}
pStart = i;
i += pLen;
// group order (q) -- integer
if (privKey[i++] !== 0x02) {
throw new Error('Unable to parse private key while generating public'
+ ' key (expected integer for q)');
}
qLen = privKey[i++];
if (qLen & 0x80) {
octets = qLen & 0x7F;
qLen = 0;
while (octets > 0) {
qLen += (privKey[i++] * Math.pow(2, (octets - 1) * 8));
--octets;
}
}
qStart = i;
i += qLen;
// group generator (g) -- integer
if (privKey[i++] !== 0x02) {
throw new Error('Unable to parse private key while generating public'
+ ' key (expected integer for g)');
}
gLen = privKey[i++];
if (gLen & 0x80) {
octets = gLen & 0x7F;
gLen = 0;
while (octets > 0) {
gLen += (privKey[i++] * Math.pow(2, (octets - 1) * 8));
--octets;
}
}
gStart = i;
i += gLen;
// public key value (y) -- integer
if (privKey[i++] !== 0x02) {
throw new Error('Unable to parse private key while generating public'
+ ' key (expected integer for g)');
}
yLen = privKey[i++];
if (yLen & 0x80) {
octets = yLen & 0x7F;
yLen = 0;
while (octets > 0) {
yLen += (privKey[i++] * Math.pow(2, (octets - 1) * 8));
--octets;
}
}
yStart = i;
i += yLen;
}
var p = 4 + 7;
keyInfo = {
type: this._privateKey.type,
fulltype: 'ssh-' + this._privateKey.type,
public: new Buffer(4 + 7
+ (this._privateKey.type === 'rsa'
? 4 + nLen + 4 + eLen
: 4 + pLen + 4 + qLen + 4 + gLen + 4 + yLen))
};
keyInfo.public.writeUInt32BE(7, 0, true);
keyInfo.public.write(keyInfo.fulltype, 4, 7, 'ascii');
if (keyInfo.type === 'rsa') {
keyInfo.public.writeUInt32BE(eLen, p, true);
privKey.copy(keyInfo.public, p += 4, eStart, eStart + eLen);
keyInfo.public.writeUInt32BE(nLen, p += eLen, true);
privKey.copy(keyInfo.public, p += 4, nStart, nStart + nLen);
} else { // DSA
keyInfo.public.writeUInt32BE(pLen, p, true);
privKey.copy(keyInfo.public, p += 4, pStart, pStart + pLen);
keyInfo.public.writeUInt32BE(qLen, p += pLen, true);
privKey.copy(keyInfo.public, p += 4, qStart, qStart + qLen);
keyInfo.public.writeUInt32BE(gLen, p += qLen, true);
privKey.copy(keyInfo.public, p += 4, gStart, gStart + gLen);
keyInfo.public.writeUInt32BE(yLen, p += gLen, true);
privKey.copy(keyInfo.public, p += 4, yStart, yStart + yLen);
}
} else
throw new Error('Unable to parse private key while generating public'
+ ' key (expected sequence)');
}
this._publicKey = keyInfo;
}
this._sock.once('connect', function() {
self._state = 'initexchg';
self.emit('connect');
self._sock.write(SSH_IDENT + '\r\n');
});
this._sock.on('data', function(data) {
self._parser.execute(data);
});
this._sock.on('timeout', function() {
self.emit('timeout');
});
this._sock.once('error', function(err) {
clearTimeout(self._readyTimeout);
err.level = 'connection-socket';
self.emit('error', err);
});
this._sock.once('end', function() {
clearTimeout(self._readyTimeout);
if (self._pinger) {
clearInterval(self._pinger);
self._pinger = undefined;
}
self._state = 'closed';
self.emit('end');
});
this._sock.once('close', function(had_err) {
clearTimeout(self._readyTimeout);
if (self._pinger) {
clearInterval(self._pinger);
self._pinger = undefined;
}
self._parser.reset();
self._state = 'closed';
self.emit('close', had_err);
});
this._sock.on('drain', function() {
self.emit('drain');
});
if (!opts.sock) {
this._debug && this._debug('DEBUG: Connection: Trying '
+ this._host
+ ' on port '
+ this._port
+ ' ...');
this._sock.connect(this._port, this._host);
this._sock.setNoDelay(true);
this._sock.setMaxListeners(0);
this._sock.setTimeout(typeof opts.timeout === 'number' ? opts.timeout : 0);
if (typeof opts.keepAliveDelay === 'number')
this._sock.setKeepAlive(true, opts.keepAliveDelay);
else
this._sock.setKeepAlive(true);
}
};
Connection.prototype.exec = function(cmd, opts, cb) {
// execute an arbitrary command on the server
if (typeof opts === 'function') {
cb = opts;
opts = undefined;
}
var self = this;
return this._openChan('session', function(err, chan) {
if (err)
return cb(err);
var todo = [];
function reqCb(err) {
if (err) {
chan.close();
return cb(err);
}
if (todo.length)
todo.shift()();
}
if (self._allowAgentFwd === true && !self._agentFwded) {
todo.push(function() {
chan._sendAgentFwd(function(err) {
if (err) return reqCb(err);
self._agentFwded = true;
reqCb();
});
});
}
if (typeof opts === 'object') {
if (typeof opts.env === 'object')
chan._sendEnv(opts.env);
if (typeof opts.pty === 'object' || opts.pty === true)
todo.push(function() { self._reqPty(chan, opts.pty, reqCb); });
if (typeof opts.x11 === 'object'
|| opts.x11 === 'number'
|| opts.x11 === true)
todo.push(function() { self._reqX11(chan, opts.x11, reqCb); });
}
todo.push(function() { chan._sendExec(cmd, opts, cb); });
todo.shift()();
});
};
Connection.prototype.shell = function(wndopts, opts, cb) {
// start an interactive terminal/shell session
var self = this;
if (typeof wndopts === 'function') {
cb = wndopts;
wndopts = opts = undefined;
} else if (typeof opts === 'function') {
cb = opts;
opts = undefined;
}
if (wndopts && wndopts.x11 !== undefined) {
opts = wndopts;
wndopts = undefined;
}
return this._openChan('session', function(err, chan) {
if (err)
return cb(err);
self._reqPty(chan, wndopts, function(err) {
if (err)
return cb(err);
var todo = [];
function reqCb(err) {
if (err) {
chan.close();
return cb(err);
}
if (todo.length)
todo.shift()();
}
if (self._allowAgentFwd === true && !self._agentFwded) {
todo.push(function() {
chan._sendAgentFwd(function(err) {
if (err) return reqCb(err);
self._agentFwded = true;
reqCb();
});
});
}
if (typeof opts === 'object') {
if (typeof opts.x11 === 'object'
|| opts.x11 === 'number'
|| opts.x11 === true)
todo.push(function() { self._reqX11(chan, opts.x11, reqCb); });
}
todo.push(function() { chan._sendShell(cb); });
todo.shift()();
});
});
};
Connection.prototype._reqX11 = function(chan, screen, cb) {
// asks server to start sending us X11 connections
var cfg = {
single: false,
proto: 'MIT-MAGIC-COOKIE-1',
cookie: crypto.randomBytes(16).toString('hex'),
screen: (typeof screen === 'number' ? screen : 0)
};
if (typeof screen === 'function')
cb = screen;
else if (typeof screen === 'object') {
if (typeof screen.single === 'boolean')
cfg.single = screen.single;
if (typeof screen.screen === 'number')
cfg.screen = screen.screen;
}
chan._sendX11(cfg, function(err) {
if (err)
return cb(err);
cb();
});
};
Connection.prototype._reqPty = function(chan, opts, cb) {
var rows = 24,
cols = 80,
width = 640,
height = 480,
term = 'vt100';
if (typeof opts === 'object') {
if (typeof opts.rows === 'number')
rows = opts.rows;
if (typeof opts.cols === 'number')
cols = opts.cols;
if (typeof opts.width === 'number')
width = opts.width;
if (typeof opts.height === 'number')
height = opts.height;
if (typeof opts.term === 'string')
term = opts.term;
} else if (typeof opts === 'function')
cb = opts;
chan._sendPtyReq(rows, cols, height, width, term, null, cb);
};
Connection.prototype.forwardIn = function(address, port, cb) {
// send a request for the server to start forwarding TCP connections to us
// on a particular address and port
/*
byte SSH_MSG_GLOBAL_REQUEST
string "tcpip-forward"
boolean want reply
string address to bind (e.g., "0.0.0.0")
uint32 port number to bind
*/
var self = this,
addrlen = Buffer.byteLength(address),
buf = new Buffer(1 + 4 + 13 + 1 + 4 + addrlen + 4);
buf[0] = MESSAGE.GLOBAL_REQUEST;
buf.writeUInt32BE(13, 1, true);
buf.write('tcpip-forward', 5, 13, 'ascii');
buf[18] = 1;
buf.writeUInt32BE(addrlen, 19, true);
buf.write(address, 23, addrlen, 'ascii');
buf.writeUInt32BE(port, 23 + addrlen, true);
this._callbacks.push(function(had_err, data) {
if (had_err)
return cb(new Error('Unable to bind ' + address + ':' + port));
if (data && data.length)
port = data.readUInt32BE(0, true);
self._forwarding.push(address + ':' + port);
if (data && data.length) {
port = data.readUInt32BE(0, true);
cb(undefined, port);
} else
cb();
});
this._debug && this._debug('DEBUG: Connection: Sending GLOBAL_REQUEST (tcpip-forward)');
return this._send(buf);
};
Connection.prototype.unforwardIn = function(address, port, cb) {
// send a request to stop forwarding traffic from the server to us for a
// particular address and port
/*
byte SSH_MSG_GLOBAL_REQUEST
string "cancel-tcpip-forward"
boolean want reply
string address_to_bind (e.g., "127.0.0.1")
uint32 port number to bind
*/
var self = this,
addrlen = Buffer.byteLength(address),
buf = new Buffer(1 + 4 + 20 + 1 + 4 + addrlen + 4);
buf[0] = MESSAGE.GLOBAL_REQUEST;
buf.writeUInt32BE(20, 1, true);
buf.write('cancel-tcpip-forward', 5, 20, 'ascii');
buf[25] = 1;
buf.writeUInt32BE(addrlen, 26, true);
buf.write(address, 30, addrlen, 'ascii');
buf.writeUInt32BE(port, 30 + addrlen, true);
this._callbacks.push(function(had_err) {
if (had_err)
return cb(new Error('Unable to unbind ' + address + ':' + port));
self._forwarding.splice(self._forwarding.indexOf(address + ':' + port), 1);
cb();
});
this._debug && this._debug('DEBUG: Connection: Sending GLOBAL_REQUEST (cancel-tcpip-forward)');
return this._send(buf);
};
Connection.prototype.forwardOut = function(srcIP, srcPort, dstIP, dstPort, cb) {
// send a request to forward a TCP connection to the server
/*
byte SSH_MSG_CHANNEL_OPEN
string "direct-tcpip"
uint32 sender channel
uint32 initial window size
uint32 maximum packet size
-------------------------------
string host to connect
uint32 port to connect
string originator IP address
uint32 originator port
*/
var srclen = Buffer.byteLength(srcIP),
dstlen = Buffer.byteLength(dstIP),
p = 0;
var buf = new Buffer(4 + srclen + 4 + 4 + dstlen + 4);
buf.writeUInt32BE(dstlen, p, true);
buf.write(dstIP, p += 4, dstlen, 'ascii');
buf.writeUInt32BE(dstPort, p += dstlen, true);
buf.writeUInt32BE(srclen, p += 4, true);
buf.write(srcIP, p += 4, srclen, 'ascii');
buf.writeUInt32BE(srcPort, p += srclen, true);
return this._openChan('direct-tcpip', buf, function(err, chan) {
if (err)
return cb(err);
var stream = new Channel.ChannelStream(chan);
chan._stream = stream;
cb(undefined, stream);
});
};
Connection.prototype.sftp = function(cb) {
var self = this;
// start an SFTP session
return this._openChan('session', function(err, chan) {
if (err)
return cb(err);
chan._sendSubsystem('sftp', function(err, stream) {
if (err)
return cb(err);
var sftp = new SFTPv3(stream, self._server_ident_raw);
sftp._init();
sftp.once('incompatible', function() {
sftp.removeAllListeners('ready');
cb(new Error('SFTP version incompatible'));
});
sftp.once('ready', function() {
sftp.removeAllListeners('incompatible');
cb(undefined, sftp);
});
sftp.once('close', function() {
stream.end();
});
});
});
};
Connection.prototype.subsys = function(subsys, cb) {
return this._openChan('session', function(err, chan) {
if (err)
return cb(err);
chan._sendSubsystem(subsys, function(err, stream) {
if (err)
return cb(err);
cb(null, stream);
});
});
};
Connection.prototype.end = function() {
if (this._sock.writable && this._state === 'authenticated')
this._disconnect(DISCONNECT_REASON.CONNECTION_LOST);
else
this.destroy();
};
Connection.prototype.destroy = function() {
this._sock && this._sock.destroy();
};
Connection.prototype._openChan = function(type, blob, cb) {
// ask the server to open a channel for some purpose (e.g. session (sftp, exec,
// terminal), or forwarding a TCP connection to the server)
var self = this,
localChan = this._nextChan(),
inWindow = Channel.MAX_WINDOW,
inPktSize = Channel.PACKET_SIZE;
if (localChan === false)
return cb(new Error('No free channels available'));
if (typeof blob === 'function') {
cb = blob;
blob = undefined;
}
this._channels.push(localChan);
this._parser.once('CHANNEL_OPEN_CONFIRMATION:' + localChan, function(info) {
// Since EventEmitters do not actually *delete* event names in the
// emitter's event array, we must do this manually so as not to leak
// our custom, channel-specific event names.
delete self._parser._events['CHANNEL_OPEN_CONFIRMATION:' + localChan];
delete self._parser._events['CHANNEL_OPEN_FAILURE:' + localChan];
var chaninfo = {
type: type,
incoming: {
id: localChan,
window: inWindow,
packetSize: inPktSize,
state: 'open'
},
outgoing: {
id: info.sender,
window: info.window,
packetSize: info.packetSize,
state: 'open'
}
};
cb(undefined, new Channel(chaninfo, self));
});
this._parser.once('CHANNEL_OPEN_FAILURE:' + localChan, function(info) {
// Since EventEmitters do not actually *delete* event names in the
// emitter's event array, we must do this manually so as not to leak
// our custom, channel-specific event names.
delete self._parser._events['CHANNEL_OPEN_CONFIRMATION:' + localChan];
delete self._parser._events['CHANNEL_OPEN_FAILURE:' + localChan];
self._channels.splice(self._channels.indexOf(localChan), 1);
var err = new Error('(SSH) Channel open failure: ' + info.description);
err.reason = info.reason;
err.lang = info.lang;
cb(err);
});
/*
byte SSH_MSG_CHANNEL_OPEN
string channel type in US-ASCII only
uint32 sender channel
uint32 initial window size
uint32 maximum packet size
.... channel type specific data follows
*/
var typelen = Buffer.byteLength(type),
bloblen = (blob ? blob.length : 0),
p = 5 + typelen;
var buf = new Buffer(1 + 4 + typelen + 4 + 4 + 4 + bloblen);
buf[0] = MESSAGE.CHANNEL_OPEN;
buf.writeUInt32BE(typelen, 1, true);
buf.write(type, 5, typelen, 'ascii');
buf.writeUInt32BE(localChan, p, true);
buf.writeUInt32BE(inWindow, p += 4, true);
buf.writeUInt32BE(inPktSize, p += 4, true);
if (blob)
blob.copy(buf, p += 4);
this._debug && this._debug('DEBUG: Connection: Sending CHANNEL_OPEN');
return this._send(buf);
};
Connection.prototype._nextChan = function() {
// get the next available channel number
// optimized path
if (this._curChan < MAX_CHANNEL)
if (++this._curChan <= MAX_CHANNEL)
return this._curChan;
// slower lookup path
for (var i = 0; i < MAX_CHANNEL; ++i)
if (this._channels.indexOf(i))
return i;
return false;
};
Connection.prototype._ping = function() {
// simply send an SSH_MSG_IGNORE message for keepalive purposes
this._debug && this._debug('DEBUG: Connection: Sending ping');
this._send(PING_PACKET);
};
Connection.prototype._tryNextAuth = function() {
// try the next user authentication mechanism:
// for ssh-agent users, this means the next public key stored in ssh-agent.