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|
var crypto = require('crypto');
var util = require('util');
var net = require('net');
var events = require('events');
var stream = require('stream');
var END_OF_FILE = 42;
var assert = require('assert').ok;
var debug;
if (process.env.NODE_DEBUG && /tls/.test(process.env.NODE_DEBUG)) {
debug = function(a) { console.error('TLS:', a); };
} else {
debug = function() { };
}
var Connection = null;
try {
Connection = process.binding('crypto').Connection;
} catch (e) {
throw new Error('node.js not compiled with openssl crypto support.');
}
// Base class of both CleartextStream and EncryptedStream
function CryptoStream(pair) {
stream.Stream.call(this);
this.pair = pair;
this.readable = this.writable = true;
this._writeState = true;
this._pending = [];
this._pendingCallbacks = [];
}
util.inherits(CryptoStream, stream.Stream);
CryptoStream.prototype.write = function(data /* , encoding, cb */) {
if (this == this.pair.cleartext) {
debug('cleartext.write called with (((' + data.toString() + ')))');
} else {
debug('encrypted.write called with ' + data.length + ' bytes');
}
if (!this.writable) {
throw new Error('CryptoStream is not writable');
}
var encoding, cb;
// parse arguments
if (typeof arguments[1] == 'string') {
encoding = arguments[1];
cb = arguments[2];
} else {
cb = arguments[1];
}
// Transform strings into buffers.
if (typeof data == 'string') {
data = new Buffer(data, encoding);
}
debug('clearIn data');
this._pending.push(data);
this._pendingCallbacks.push(cb);
this.pair._writeCalled = true;
this.pair._cycle();
return this._writeState;
};
CryptoStream.prototype.pause = function() {
debug('paused ' + (this == this.pair.cleartext ? 'cleartext' : 'encrypted'));
this._writeState = false;
};
CryptoStream.prototype.resume = function() {
debug('resume ' + (this == this.pair.cleartext ? 'cleartext' : 'encrypted'));
this._writeState = true;
this.pair._cycle();
};
CryptoStream.prototype.setTimeout = function(n) {
if (this.socket) this.socket.setTimeout(n);
};
CryptoStream.prototype.setNoDelay = function() {
if (this.socket) this.socket.setNoDelay();
};
CryptoStream.prototype.setEncoding = function(encoding) {
var StringDecoder = require('string_decoder').StringDecoder; // lazy load
this._decoder = new StringDecoder(encoding);
};
// EG '/C=US/ST=CA/L=SF/O=Joyent/OU=Node.js/CN=ca1/emailAddress=ry@clouds.org'
function parseCertString(s) {
var out = {};
var parts = s.split('/');
// Note: can always skip the first one.
for (var i = 1; i < parts.length; i++) {
var sepIndex = parts[i].indexOf('=');
if (sepIndex > 0) {
var key = parts[i].slice(0, sepIndex);
var value = parts[i].slice(sepIndex + 1);
out[key] = value;
}
}
return out;
}
CryptoStream.prototype.getPeerCertificate = function() {
if (this.pair._ssl) {
var c = this.pair._ssl.getPeerCertificate();
if (c) {
if (c.issuer) c.issuer = parseCertString(c.issuer);
if (c.subject) c.subject = parseCertString(c.subject);
return c;
}
}
return null;
};
CryptoStream.prototype.getCipher = function(err) {
if (this.pair._ssl) {
return this.pair._ssl.getCurrentCipher();
} else {
return null;
}
};
CryptoStream.prototype.end = function(d) {
if (!this.writable) {
throw new Error('CryptoStream is not writable');
}
if (this.pair._done) return;
if (d) {
this.write(d);
}
this._pending.push(END_OF_FILE);
this._pendingCallbacks.push(null);
// If this is an encrypted stream then we need to disable further 'data'
// events.
this.writable = false;
this.pair._cycle();
};
CryptoStream.prototype.destroySoon = function(err) {
if (this.writable) {
this.end();
} else {
this.destroy();
}
};
CryptoStream.prototype.destroy = function(err) {
if (this.pair._done) return;
this.pair._destroy();
};
CryptoStream.prototype._done = function() {
this._doneFlag = true;
if (this.pair.cleartext._doneFlag &&
this.pair.encrypted._doneFlag &&
!this.pair._done) {
// If both streams are done:
this.pair._destroy();
}
};
CryptoStream.prototype.fd = -1;
CryptoStream.prototype.__defineGetter__('readyState',
net.Socket.prototype.__lookupGetter__('readyState'));
// Move decrypted, clear data out into the application.
// From the user's perspective this occurs as a 'data' event
// on the pair.cleartext.
// also
// Move encrypted data to the stream. From the user's perspective this
// occurs as a 'data' event on the pair.encrypted. Usually the application
// will have some code which pipes the stream to a socket:
//
// pair.encrypted.on('data', function (d) {
// socket.write(d);
// });
//
CryptoStream.prototype._push = function() {
if (this == this.pair.encrypted && !this.writable) {
// If the encrypted side got EOF, we do not attempt
// to write out data anymore.
return;
}
while (this._writeState == true) {
var bytesRead = 0;
var chunkBytes = 0;
var pool = new Buffer(4096); // alloc every time?
do {
chunkBytes = this._pusher(pool, bytesRead, pool.length - bytesRead);
if (this.pair._ssl && this.pair._ssl.error) {
this.pair._error();
return;
}
this.pair._maybeInitFinished();
if (chunkBytes >= 0) {
bytesRead += chunkBytes;
}
} while ((chunkBytes > 0) && (bytesRead < pool.length));
assert(bytesRead >= 0);
// Bail out if we didn't read any data.
if (bytesRead == 0) {
if (this._pendingBytes() == 0 && this._destroyAfterPush) {
this._done();
}
return;
}
var chunk = pool.slice(0, bytesRead);
if (this === this.pair.cleartext) {
debug('cleartext emit "data" called with (((' + chunk.toString() + ')))');
} else {
debug('encrypted emit "data" with ' + bytesRead + ' bytes');
}
if (this._decoder) {
var string = this._decoder.write(chunk);
if (string.length) this.emit('data', string);
} else {
this.emit('data', chunk);
}
// Optimization: emit the original buffer with end points
if (this.ondata) this.ondata(pool, 0, bytesRead);
}
};
// Push in any clear data coming from the application.
// This arrives via some code like this:
//
// pair.cleartext.write("hello world");
//
// also
//
// Push in incoming encrypted data from the socket.
// This arrives via some code like this:
//
// socket.on('data', function (d) {
// pair.encrypted.write(d)
// });
//
CryptoStream.prototype._pull = function() {
var havePending = this._pending.length > 0;
while (this._pending.length > 0) {
if (!this.pair._ssl) break;
var tmp = this._pending.shift();
var cb = this._pendingCallbacks.shift();
assert(this._pending.length === this._pendingCallbacks.length);
if (tmp === END_OF_FILE) {
// Sending EOF
if (this === this.pair.encrypted) {
debug('end encrypted ' + this.pair.fd);
this.pair.cleartext._destroyAfterPush = true;
} else {
// CleartextStream
assert(this === this.pair.cleartext);
debug('end cleartext');
this.pair._ssl.shutdown();
// TODO check if we get EAGAIN From shutdown, would have to do it
// again. should unshift END_OF_FILE back onto pending and wait for
// next cycle.
this.pair.encrypted._destroyAfterPush = true;
}
this.pair._cycle();
this._done()
return;
}
if (tmp.length == 0) continue;
var rv = this._puller(tmp);
if (this.pair._ssl && this.pair._ssl.error) {
this.pair._error();
return;
}
this.pair._maybeInitFinished();
if (rv === 0 || rv < 0) {
this._pending.unshift(tmp);
this._pendingCallbacks.unshift(cb);
break;
}
if (cb) cb();
assert(rv === tmp.length);
}
// If we've cleared all of incoming encrypted data, emit drain.
if (havePending && this._pending.length === 0) {
debug('drain');
this.emit('drain');
if (this.__destroyOnDrain) this.end();
}
};
function CleartextStream(pair) {
CryptoStream.call(this, pair);
}
util.inherits(CleartextStream, CryptoStream);
CleartextStream.prototype._pendingBytes = function() {
if (this.pair._ssl) {
return this.pair._ssl.clearPending();
} else {
return 0;
}
};
CleartextStream.prototype._puller = function(b) {
debug('clearIn ' + b.length + ' bytes');
return this.pair._ssl.clearIn(b, 0, b.length);
};
CleartextStream.prototype._pusher = function(pool, offset, length) {
debug('reading from clearOut');
if (!this.pair._ssl) return -1;
return this.pair._ssl.clearOut(pool, offset, length);
};
function EncryptedStream(pair) {
CryptoStream.call(this, pair);
}
util.inherits(EncryptedStream, CryptoStream);
EncryptedStream.prototype._pendingBytes = function() {
if (this.pair._ssl) {
return this.pair._ssl.encPending();
} else {
return 0;
}
};
EncryptedStream.prototype._puller = function(b) {
debug('writing from encIn');
return this.pair._ssl.encIn(b, 0, b.length);
};
EncryptedStream.prototype._pusher = function(pool, offset, length) {
debug('reading from encOut');
if (!this.pair._ssl) return -1;
return this.pair._ssl.encOut(pool, offset, length);
};
/**
* Provides a pair of streams to do encrypted communication.
*/
function SecurePair(credentials, isServer, requestCert, rejectUnauthorized) {
if (!(this instanceof SecurePair)) {
return new SecurePair(credentials,
isServer,
requestCert,
rejectUnauthorized);
}
var self = this;
events.EventEmitter.call(this);
this._secureEstablished = false;
this._isServer = isServer ? true : false;
this._encWriteState = true;
this._clearWriteState = true;
this._done = false;
var crypto = require('crypto');
if (!credentials) {
this.credentials = crypto.createCredentials();
} else {
this.credentials = credentials;
}
if (!this._isServer) {
// For clients, we will always have either a given ca list or be using
// default one
requestCert = true;
}
this._secureEstablished = false;
this._rejectUnauthorized = rejectUnauthorized ? true : false;
this._requestCert = requestCert ? true : false;
this._ssl = new Connection(this.credentials.context,
this._isServer ? true : false,
this._requestCert,
this._rejectUnauthorized);
/* Acts as a r/w stream to the cleartext side of the stream. */
this.cleartext = new CleartextStream(this);
/* Acts as a r/w stream to the encrypted side of the stream. */
this.encrypted = new EncryptedStream(this);
process.nextTick(function() {
self._ssl.start();
self._cycle();
});
}
util.inherits(SecurePair, events.EventEmitter);
exports.createSecurePair = function(credentials,
isServer,
requestCert,
rejectUnauthorized) {
var pair = new SecurePair(credentials,
isServer,
requestCert,
rejectUnauthorized);
return pair;
};
/* Attempt to cycle OpenSSLs buffers in various directions.
*
* An SSL Connection can be viewed as four separate piplines,
* interacting with one has no connection to the behavoir of
* any of the other 3 -- This might not sound reasonable,
* but consider things like mid-stream renegotiation of
* the ciphers.
*
* The four pipelines, using terminology of the client (server is just
* reversed):
* (1) Encrypted Output stream (Writing encrypted data to peer)
* (2) Encrypted Input stream (Reading encrypted data from peer)
* (3) Cleartext Output stream (Decrypted content from the peer)
* (4) Cleartext Input stream (Cleartext content to send to the peer)
*
* This function attempts to pull any available data out of the Cleartext
* input stream (4), and the Encrypted input stream (2). Then it pushes any
* data available from the cleartext output stream (3), and finally from the
* Encrypted output stream (1)
*
* It is called whenever we do something with OpenSSL -- post reciving
* content, trying to flush, trying to change ciphers, or shutting down the
* connection.
*
* Because it is also called everywhere, we also check if the connection has
* completed negotiation and emit 'secure' from here if it has.
*/
SecurePair.prototype._cycle = function(depth) {
depth = depth ? depth : 0;
if (this._done) {
return;
}
if(depth == 0) this._writeCalled = false;
var established = this._secureEstablished;
if (!this._cycleEncryptedPullLock) {
this._cycleEncryptedPullLock = true;
this.encrypted._pull();
this._cycleEncryptedPullLock = false;
}
if (!this._cycleCleartextPullLock) {
this._cycleCleartextPullLock = true;
this.cleartext._pull();
this._cycleCleartextPullLock = false;
}
if (!this._cycleCleartextPushLock) {
this._cycleCleartextPushLock = true;
this.cleartext._push();
this._cycleCleartextPushLock = false;
}
if (!this._cycleEncryptedPushLock) {
this._cycleEncryptedPushLock = true;
this.encrypted._push();
this._cycleEncryptedPushLock = false;
}
if (this._done) {
return;
}
if ((!established && this._secureEstablished) ||
(depth == 0 && this._writeCalled)) {
// If we were not established but now we are, let's cycle again.
// Or if there is some data to write...
this._cycle(depth + 1);
}
};
SecurePair.prototype._maybeInitFinished = function() {
if (this._ssl && !this._secureEstablished && this._ssl.isInitFinished()) {
this._secureEstablished = true;
debug('secure established');
this.emit('secure');
}
};
SecurePair.prototype._destroy = function() {
var self = this;
if (!this._done) {
this._done = true;
this._ssl.error = null;
this._ssl.close();
this._ssl = null;
self.encrypted.writable = self.encrypted.readable = false;
self.cleartext.writable = self.cleartext.readable = false;
process.nextTick(function() {
self.encrypted.emit('end');
if (self.encrypted.onend) self.encrypted.onend();
self.encrypted.emit('close');
self.cleartext.emit('end');
if (self.cleartext.onend) self.cleartext.onend();
self.cleartext.emit('close');
});
}
this._cycle();
};
SecurePair.prototype._error = function() {
if (!this._secureEstablished) {
this._destroy();
} else {
var err = this._ssl.error;
this._ssl.error = null;
if (this._isServer &&
this._rejectUnauthorized &&
/peer did not return a certificate/.test(err.message)) {
// Not really an error.
this._destroy();
} else {
this.cleartext.emit('error', err);
}
}
};
// TODO: support anonymous (nocert) and PSK
// AUTHENTICATION MODES
//
// There are several levels of authentication that TLS/SSL supports.
// Read more about this in "man SSL_set_verify".
//
// 1. The server sends a certificate to the client but does not request a
// cert from the client. This is common for most HTTPS servers. The browser
// can verify the identity of the server, but the server does not know who
// the client is. Authenticating the client is usually done over HTTP using
// login boxes and cookies and stuff.
//
// 2. The server sends a cert to the client and requests that the client
// also send it a cert. The client knows who the server is and the server is
// requesting the client also identify themselves. There are several
// outcomes:
//
// A) verifyError returns null meaning the client's certificate is signed
// by one of the server's CAs. The server know's the client idenity now
// and the client is authorized.
//
// B) For some reason the client's certificate is not acceptable -
// verifyError returns a string indicating the problem. The server can
// either (i) reject the client or (ii) allow the client to connect as an
// unauthorized connection.
//
// The mode is controlled by two boolean variables.
//
// requestCert
// If true the server requests a certificate from client connections. For
// the common HTTPS case, users will want this to be false, which is what
// it defaults to.
//
// rejectUnauthorized
// If true clients whose certificates are invalid for any reason will not
// be allowed to make connections. If false, they will simply be marked as
// unauthorized but secure communication will continue. By default this is
// false.
//
//
//
// Options:
// - requestCert. Send verify request. Default to false.
// - rejectUnauthorized. Boolean, default to false.
// - key. string.
// - cert: string.
// - ca: string or array of strings.
//
// emit 'secureConnection'
// function (cleartextStream, encryptedStream) { }
//
// 'cleartextStream' has the boolean property 'authorized' to determine if
// it was verified by the CA. If 'authorized' is false, a property
// 'authorizationError' is set on cleartextStream and has the possible
// values:
//
// "UNABLE_TO_GET_ISSUER_CERT", "UNABLE_TO_GET_CRL",
// "UNABLE_TO_DECRYPT_CERT_SIGNATURE", "UNABLE_TO_DECRYPT_CRL_SIGNATURE",
// "UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY", "CERT_SIGNATURE_FAILURE",
// "CRL_SIGNATURE_FAILURE", "CERT_NOT_YET_VALID" "CERT_HAS_EXPIRED",
// "CRL_NOT_YET_VALID", "CRL_HAS_EXPIRED" "ERROR_IN_CERT_NOT_BEFORE_FIELD",
// "ERROR_IN_CERT_NOT_AFTER_FIELD", "ERROR_IN_CRL_LAST_UPDATE_FIELD",
// "ERROR_IN_CRL_NEXT_UPDATE_FIELD", "OUT_OF_MEM",
// "DEPTH_ZERO_SELF_SIGNED_CERT", "SELF_SIGNED_CERT_IN_CHAIN",
// "UNABLE_TO_GET_ISSUER_CERT_LOCALLY", "UNABLE_TO_VERIFY_LEAF_SIGNATURE",
// "CERT_CHAIN_TOO_LONG", "CERT_REVOKED" "INVALID_CA",
// "PATH_LENGTH_EXCEEDED", "INVALID_PURPOSE" "CERT_UNTRUSTED",
// "CERT_REJECTED"
//
//
// TODO:
// cleartext.credentials (by mirroring from pair object)
// cleartext.getCertificate() (by mirroring from pair.credentials.context)
function Server(/* [options], listener */) {
var options, listener;
if (typeof arguments[0] == 'object') {
options = arguments[0];
listener = arguments[1];
} else if (typeof arguments[0] == 'function') {
options = {};
listener = arguments[0];
}
if (!(this instanceof Server)) return new Server(options, listener);
var self = this;
// constructor call
net.Server.call(this, function(socket) {
var creds = crypto.createCredentials({
key: self.key,
cert: self.cert,
ca: self.ca,
crl: self.crl
});
//creds.context.setCiphers('RC4-SHA:AES128-SHA:AES256-SHA');
var pair = new SecurePair(creds,
true,
self.requestCert,
self.rejectUnauthorized);
var cleartext = pipe(pair, socket);
cleartext._controlReleased = false;
pair.on('secure', function() {
pair.cleartext.authorized = false;
if (!self.requestCert) {
cleartext._controlReleased = true;
self.emit('secureConnection', pair.cleartext, pair.encrypted);
} else {
var verifyError = pair._ssl.verifyError();
if (verifyError) {
pair.cleartext.authorizationError = verifyError;
if (self.rejectUnauthorized) {
socket.destroy();
pair._destroy();
} else {
cleartext._controlReleased = true;
self.emit('secureConnection', pair.cleartext, pair.encrypted);
}
} else {
pair.cleartext.authorized = true;
cleartext._controlReleased = true;
self.emit('secureConnection', pair.cleartext, pair.encrypted);
}
}
});
});
if (listener) {
this.on('secureConnection', listener);
}
// Handle option defaults:
this.setOptions(options);
}
util.inherits(Server, net.Server);
exports.Server = Server;
exports.createServer = function(options, listener) {
return new Server(options, listener);
};
Server.prototype.setOptions = function(options) {
if (typeof options.requestCert == 'boolean') {
this.requestCert = options.requestCert;
} else {
this.requestCert = false;
}
if (typeof options.rejectUnauthorized == 'boolean') {
this.rejectUnauthorized = options.rejectUnauthorized;
} else {
this.rejectUnauthorized = false;
}
if (options.key) this.key = options.key;
if (options.cert) this.cert = options.cert;
if (options.ca) this.ca = options.ca;
if (options.crl) this.crl = options.crl;
};
// Target API:
//
// var s = tls.connect(8000, "google.com", options, function() {
// if (!s.authorized) {
// s.destroy();
// return;
// }
//
// // s.socket;
//
// s.end("hello world\n");
// });
//
//
// TODO: make port, host part of options!
exports.connect = function(port /* host, options, cb */) {
// parse args
var host, options = {}, cb;
for (var i = 1; i < arguments.length; i++) {
switch (typeof arguments[i]) {
case 'string':
host = arguments[i];
break;
case 'object':
options = arguments[i];
break;
case 'function':
cb = arguments[i];
break;
}
}
var socket = new net.Stream();
var sslcontext = crypto.createCredentials(options);
//sslcontext.context.setCiphers('RC4-SHA:AES128-SHA:AES256-SHA');
var pair = new SecurePair(sslcontext, false);
var cleartext = pipe(pair, socket);
socket.connect(port, host);
pair.on('secure', function() {
var verifyError = pair._ssl.verifyError();
if (verifyError) {
cleartext.authorized = false;
cleartext.authorizationError = verifyError;
} else {
cleartext.authorized = true;
}
if (cb) cb();
});
cleartext._controlReleased = true;
return cleartext;
};
function pipe(pair, socket) {
pair.encrypted.pipe(socket);
socket.pipe(pair.encrypted);
pair.fd = socket.fd;
var cleartext = pair.cleartext;
cleartext.socket = socket;
cleartext.encrypted = pair.encrypted;
cleartext.authorized = false;
function onerror(e) {
if (cleartext._controlReleased) {
cleartext.emit('error', e);
}
}
function onclose() {
socket.removeListener('error', onerror);
socket.removeListener('close', onclose);
}
socket.on('error', onerror);
socket.on('close', onclose);
return cleartext;
}
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