/js/lib/Socket.IO-node/support/socket.io-client/lib/vendor/web-socket-js/flash-src/com/hurlant/crypto/tls/TLSEngine.as
ActionScript | 895 lines | 608 code | 113 blank | 174 comment | 102 complexity | 108e9ed65d14ec468afb038b8a2f1e2d MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.1, MPL-2.0-no-copyleft-exception, BSD-3-Clause
- /**
- * TLSEngine
- *
- * A TLS protocol implementation.
- * See comment below for some details.
- * Copyright (c) 2007 Henri Torgemane
- *
- * Patched(heavily) by Bobby Parker (shortwave@gmail.com)
- *
- * See LICENSE.txt for full license information.
- */
- package com.hurlant.crypto.tls {
- import com.hurlant.crypto.cert.X509Certificate;
- import com.hurlant.crypto.cert.X509CertificateCollection;
- import com.hurlant.crypto.prng.Random;
- import com.hurlant.util.ArrayUtil;
- import com.hurlant.util.Hex;
-
- import flash.events.Event;
- import flash.events.EventDispatcher;
- import flash.events.ProgressEvent;
- import flash.utils.ByteArray;
- import flash.utils.IDataInput;
- import flash.utils.IDataOutput;
- import flash.utils.clearTimeout;
- import flash.utils.setTimeout;
- import com.hurlant.crypto.prng.ARC4;
- [Event(name="close", type="flash.events.Event")]
- [Event(name="socketData", type="flash.events.ProgressEvent")]
- [Event(name="ready", type="com.hurlant.crypto.tls.TLSEvent")]
- [Event(name="data", type="com.hurlant.crypto.tls.TLSEvent")]
-
- /**
- * The heart of the TLS protocol.
- * This class can work in server or client mode.
- *
- * This doesn't fully implement the TLS protocol.
- *
- * Things missing that I'd like to add:
- * - support for client-side certificates
- * - general code clean-up to make sure we don't have gaping securite holes
- *
- * Things that aren't there that I won't add:
- * - support for "export" cypher suites (deprecated in later TLS versions)
- * - support for "anon" cypher suites (deprecated in later TLS versions)
- *
- * Things that I'm unsure about adding later:
- * - compression. Compressing encrypted streams is barely worth the CPU cycles.
- * - diffie-hellman based key exchange mechanisms. Nifty, but would we miss it?
- *
- * @author henri
- *
- */
- public class TLSEngine extends EventDispatcher {
-
- public static const SERVER:uint = 0;
- public static const CLIENT:uint = 1;
- public var protocol_version:uint;
-
- private static const PROTOCOL_HANDSHAKE:uint = 22;
- private static const PROTOCOL_ALERT:uint = 21;
- private static const PROTOCOL_CHANGE_CIPHER_SPEC:uint = 20;
- private static const PROTOCOL_APPLICATION_DATA:uint = 23;
- private static const STATE_NEW:uint = 0; // brand new. nothing happened yet
- private static const STATE_NEGOTIATING:uint = 1; // we're figuring out what to use
- private static const STATE_READY:uint = 2; // we're ready for AppData stuff to go over us.
- private static const STATE_CLOSED:uint = 3; // we're done done.
-
- private var _entity:uint; // SERVER | CLIENT
- private var _config:TLSConfig;
-
- private var _state:uint;
-
- private var _securityParameters:ISecurityParameters;
-
- private var _currentReadState:IConnectionState;
- private var _currentWriteState:IConnectionState;
- private var _pendingReadState:IConnectionState;
- private var _pendingWriteState:IConnectionState;
-
- private var _handshakePayloads:ByteArray;
- private var _handshakeRecords:ByteArray; // For client-side certificate verify
-
- private var _iStream:IDataInput;
- private var _oStream:IDataOutput;
-
- // temporary store for X509 certs received by this engine.
- private var _store:X509CertificateCollection;
- // the main certificate received from the other side.
- private var _otherCertificate:X509Certificate;
-
- public function get peerCertificate() : X509Certificate {
- return _otherCertificate;
- }
- // If this isn't null, we expect this identity to be found in the Cert's Subject CN.
- private var _otherIdentity:String;
-
- // The client-side cert
- private var _myCertficate:X509Certificate;
- // My Identity
- private var _myIdentity:String;
-
- /**
- *
- * @param config A TLSConfig instance describing how we're supposed to work
- * @param iStream An input stream to read TLS data from
- * @param oStream An output stream to write TLS data to
- * @param otherIdentity An optional identifier. If set, this will be checked against the Subject CN of the other side's certificate.
- *
- */
- function TLSEngine(config:TLSConfig, iStream:IDataInput, oStream:IDataOutput, otherIdentity:String = null) {
- _entity = config.entity;
- _config = config;
- _iStream = iStream;
- _oStream = oStream;
- _otherIdentity = otherIdentity;
-
- _state = STATE_NEW;
-
- // Pick the right set of callbacks
- _entityHandshakeHandlers = _entity == CLIENT ? handshakeHandlersClient : handshakeHandlersServer;
-
- // setting up new security parameters needs to be controlled by...something.
- if (_config.version == SSLSecurityParameters.PROTOCOL_VERSION) {
- _securityParameters = new SSLSecurityParameters(_entity);
- } else {
- _securityParameters = new TLSSecurityParameters(_entity, _config.certificate, _config.privateKey);
- }
- protocol_version = _config.version;
-
- // So this...why is it here, other than to preclude a possible null pointer situation?
- var states:Object = _securityParameters.getConnectionStates();
-
- _currentReadState = states.read;
- _currentWriteState = states.write;
-
- _handshakePayloads = new ByteArray;
-
- _store = new X509CertificateCollection;
- }
-
- /**
- * This starts the TLS negotiation for a TLS Client.
- *
- * This is a no-op for a TLS Server.
- *
- */
- public function start():void {
- if (_entity == CLIENT) {
- try {
- startHandshake();
- } catch (e:TLSError) {
- handleTLSError(e);
- }
- }
- }
-
-
- public function dataAvailable(e:* = null):void {
- if (_state == STATE_CLOSED) return; // ignore
- try {
- parseRecord(_iStream);
- } catch (e:TLSError) {
- handleTLSError(e);
- }
- }
-
- public function close(e:TLSError = null):void {
- if (_state == STATE_CLOSED) return; // ignore
- // ok. send an Alert to let the peer know
- var rec:ByteArray = new ByteArray;
- if (e==null && _state != STATE_READY) {
- // use canceled while handshaking. be nice about it
- rec[0] = 1;
- rec[1] = TLSError.user_canceled;
- sendRecord(PROTOCOL_ALERT, rec);
- }
- rec[0] = 2;
- if (e == null) {
- rec[1] = TLSError.close_notify;
- } else {
- rec[1] = e.errorID;
- trace("TLSEngine shutdown triggered by "+e);
- }
- sendRecord(PROTOCOL_ALERT, rec);
-
- _state = STATE_CLOSED;
- dispatchEvent(new Event(Event.CLOSE));
- }
-
- private var _packetQueue:Array = [];
- private function parseRecord(stream:IDataInput):void {
- var p:ByteArray;
- while(_state!=STATE_CLOSED && stream.bytesAvailable>4) {
-
- if (_packetQueue.length>0) {
- var packet:Object = _packetQueue.shift();
- p = packet.data;
- if (stream.bytesAvailable+p.length>=packet.length) {
- // we have a whole packet. put together.
- stream.readBytes(p, p.length, packet.length-p.length);
- parseOneRecord(packet.type, packet.length, p);
- // do another loop to parse any leftover record
- continue;
- } else {
- // not enough. grab the data and park it.
- stream.readBytes(p, p.length, stream.bytesAvailable);
- _packetQueue.push(packet);
- continue;
- }
- }
- var type:uint = stream.readByte();
- var ver:uint = stream.readShort();
- var length:uint = stream.readShort();
- if (length>16384+2048) { // support compression and encryption overhead.
- throw new TLSError("Excessive TLS Record length: "+length, TLSError.record_overflow);
- }
- // Can pretty much assume that if I'm here, I've got a default config, so let's use it.
- if (ver != _securityParameters.version ) {
- throw new TLSError("Unsupported TLS version: "+ver.toString(16), TLSError.protocol_version);
- }
- p = new ByteArray;
- var actualLength:uint = Math.min(stream.bytesAvailable, length);
- stream.readBytes(p, 0, actualLength);
- if (actualLength == length) {
- parseOneRecord(type, length, p);
- } else {
- _packetQueue.push({type:type, length:length, data:p});
- }
- }
- }
-
-
- // Protocol handler map, provides a mapping of protocol types to individual packet handlers
- private var protocolHandlers:Object = { 23 : parseApplicationData, // PROTOCOL_APPLICATION_DATA
- 22 : parseHandshake, // PROTOCOL_HANDSHAKE
- 21 : parseAlert, // PROTOCOL_ALERT
- 20 : parseChangeCipherSpec }; // PROTOCOL_CHANGE_CIPHER_SPEC
-
- /**
- * Modified to support the notion of a handler map(see above ), since it makes for better clarity (IMHO of course).
- */
- private function parseOneRecord(type:uint, length:uint, p:ByteArray):void {
- p = _currentReadState.decrypt(type, length, p);
- if (p.length>16384) {
- throw new TLSError("Excessive Decrypted TLS Record length: "+p.length, TLSError.record_overflow);
- }
- if (protocolHandlers.hasOwnProperty( type )) {
- while( p != null)
- p = protocolHandlers[ type ]( p );
- } else {
- throw new TLSError("Unsupported TLS Record Content Type: "+type.toString( 16 ), TLSError.unexpected_message);
- }
- }
-
- ///////// handshake handling
- // session identifier
- // peer certificate
- // compression method
- // cipher spec
- // master secret
- // is resumable
- private static const HANDSHAKE_HELLO_REQUEST:uint = 0;
- private static const HANDSHAKE_CLIENT_HELLO:uint = 1;
- private static const HANDSHAKE_SERVER_HELLO:uint = 2;
- private static const HANDSHAKE_CERTIFICATE:uint = 11;
- private static const HANDSHAKE_SERVER_KEY_EXCHANGE:uint = 12;
- private static const HANDSHAKE_CERTIFICATE_REQUEST:uint = 13;
- private static const HANDSHAKE_HELLO_DONE:uint = 14;
- private static const HANDSHAKE_CERTIFICATE_VERIFY:uint = 15;
- private static const HANDSHAKE_CLIENT_KEY_EXCHANGE:uint = 16;
- private static const HANDSHAKE_FINISHED:uint = 20;
- // Server handshake handler map
- private var handshakeHandlersServer:Object = { 0 : notifyStateError, // HANDSHAKE_HELLO_REQUEST
- 1 : parseHandshakeClientHello, // HANDSHAKE_CLIENT_HELLO
- 2 : notifyStateError, // HANDSHAKE_SERVER_HELLO
- 11 : loadCertificates, // HANDSHAKE_CERTIFICATE
- 12 : notifyStateError, // HANDSHAKE_SERVER_KEY_EXCHANGE
- 13 : notifyStateError, // HANDSHAKE_CERTIFICATE_REQUEST
- 14 : notifyStateError, // HANDSHAKE_HELLO_DONE
- 15 : notifyStateError, // HANDSHAKE_CERTIFICATE_VERIFY
- 16 : parseHandshakeClientKeyExchange, // HANDSHAKE_CLIENT_KEY_EXCHANGE
- 20 : verifyHandshake // HANDSHAKE_FINISHED
- };
-
- // Client handshake handler map
- private var handshakeHandlersClient:Object = { 0 : parseHandshakeHello, // HANDSHAKE_HELLO_REQUEST
- 1 : notifyStateError, // HANDSHAKE_CLIENT_HELLO
- 2 : parseHandshakeServerHello, // HANDSHAKE_SERVER_HELLO
- 11 : loadCertificates, // HANDSHAKE_CERTIFICATE
- 12 : parseServerKeyExchange, // HANDSHAKE_SERVER_KEY_EXCHANGE
- 13 : setStateRespondWithCertificate, // HANDSHAKE_CERTIFICATE
- 14 : sendClientAck, // HANDSHAKE_HELLO_DONE
- 15 : notifyStateError, // HANDSHAKE_CERTIFICATE_VERIFY
- 16 : notifyStateError, // HANDSHAKE_CLIENT_KEY_EXCHANGE
- 20 : verifyHandshake // HANDSHAKE_FINISHED
- };
- private var _entityHandshakeHandlers:Object;
- private var _handshakeCanContinue:Boolean = true; // For handling cases where I might need to pause processing during a handshake (cert issues, etc.).
- private var _handshakeQueue:Array = [];
- /**
- * The handshake is always started by the client.
- */
- private function startHandshake():void {
- _state = STATE_NEGOTIATING;
- // reset some other handshake state. XXX
- sendClientHello();
- }
-
- /**
- * Handle the incoming handshake packet.
- *
- */
- private function parseHandshake(p:ByteArray):ByteArray {
-
- if (p.length<4) {
- trace("Handshake packet is way too short. bailing.");
- return null;
- }
- p.position = 0;
-
- var rec:ByteArray = p;
- var type:uint = rec.readUnsignedByte();
- var tmp:uint = rec.readUnsignedByte();
- var length:uint = (tmp<<16) | rec.readUnsignedShort();
- if (length+4>p.length) {
- // partial read.
- trace("Handshake packet is incomplete. bailing.");
- return null;
- }
- // we need to copy the record, to have a valid FINISHED exchange.
- if (type!=HANDSHAKE_FINISHED) {
- _handshakePayloads.writeBytes(p, 0, length+4);
- }
-
- // Surf the handler map and find the right handler for this handshake packet type.
- // I modified the individual handlers so they encapsulate all possible knowledge
- // about the incoming packet type, so no previous handling or massaging of the data
- // is required, as was the case using the switch statement. BP
- if (_entityHandshakeHandlers.hasOwnProperty( type )) {
- if (_entityHandshakeHandlers[ type ] is Function)
- _entityHandshakeHandlers[ type ]( rec );
- } else {
- throw new TLSError( "Unimplemented or unknown handshake type!", TLSError.internal_error );
- }
-
- // Get set up for the next packet.
- if (length+4<p.length) {
- var n:ByteArray = new ByteArray;
- n.writeBytes(p,length+4, p.length-(length+4));
- return n;
- } else {
- return null;
- }
- }
-
- /**
- * Throw an error when the detected handshake state isn't a valid state for the given entity type (client vs. server, etc. ).
- * This really should abort the handshake, since there's no case in which a server should EVER be confused about the type of entity it is. BP
- */
- private function notifyStateError( rec:ByteArray ) : void {
- throw new TLSError( "Invalid handshake state for a TLS Entity type of " + _entity, TLSError.internal_error );
- }
-
- /**
- * two unimplemented functions
- */
- private function parseClientKeyExchange( rec:ByteArray ) : void {
- throw new TLSError( "ClientKeyExchange is currently unimplemented!", TLSError.internal_error );
- }
-
- private function parseServerKeyExchange( rec:ByteArray ) : void {
- throw new TLSError( "ServerKeyExchange is currently unimplemented!", TLSError.internal_error );
- }
-
- /**
- * Test the server's Finished message for validity against the data we know about. Only slightly rewritten. BP
- */
- private function verifyHandshake( rec:ByteArray):void {
- // Get the Finished message
- var verifyData:ByteArray = new ByteArray;
- // This, in the vain hope that noboby is using SSL 2 anymore
- if (_securityParameters.version == SSLSecurityParameters.PROTOCOL_VERSION) {
- rec.readBytes(verifyData, 0, 36); // length should be (in fact, better be) 16 + 20 (md5-size + sha1-size)
- } else { // presuming TLS
- rec.readBytes(verifyData, 0, 12);
- }
-
- var data:ByteArray = _securityParameters.computeVerifyData(1-_entity, _handshakePayloads);
- if (ArrayUtil.equals(verifyData, data)) {
- _state = STATE_READY;
- dispatchEvent(new TLSEvent(TLSEvent.READY));
- } else {
- throw new TLSError("Invalid Finished mac.", TLSError.bad_record_mac);
- }
- }
- // enforceClient/enforceServer removed in favor of state-driven function maps
- /**
- * Handle a HANDSHAKE_HELLO
- */
- private function parseHandshakeHello( rec:ByteArray ) : void {
- if (_state != STATE_READY) {
- trace("Received an HELLO_REQUEST before being in state READY. ignoring.");
- return;
- }
- _handshakePayloads = new ByteArray;
- startHandshake();
- }
-
- /**
- * Handle a HANDSHAKE_CLIENT_KEY_EXCHANGE
- */
- private function parseHandshakeClientKeyExchange(rec:ByteArray):void {
- if (_securityParameters.useRSA) {
- // skip 2 bytes for length.
- var len:uint = rec.readShort();
- var cipher:ByteArray = new ByteArray;
- rec.readBytes(cipher, 0, len);
- var preMasterSecret:ByteArray = new ByteArray;
- _config.privateKey.decrypt(cipher, preMasterSecret, len);
- _securityParameters.setPreMasterSecret(preMasterSecret);
-
- // now is a good time to get our pending states
- var o:Object = _securityParameters.getConnectionStates();
- _pendingReadState = o.read;
- _pendingWriteState = o.write;
-
- } else {
- throw new TLSError("parseHandshakeClientKeyExchange not implemented for DH modes.", TLSError.internal_error);
- }
-
- }
-
- /**
- * Handle HANDSHAKE_SERVER_HELLO - client-side
- */
- private function parseHandshakeServerHello( rec:IDataInput ) : void {
-
- var ver:uint = rec.readShort();
- if (ver != _securityParameters.version) {
- throw new TLSError("Unsupported TLS version: "+ver.toString(16), TLSError.protocol_version);
- }
- var random:ByteArray = new ByteArray;
- rec.readBytes(random, 0, 32);
- var session_length:uint = rec.readByte();
- var session:ByteArray = new ByteArray;
- if (session_length > 0) {
- // some implementations don't assign a session ID
- rec.readBytes(session, 0, session_length);
- }
-
- _securityParameters.setCipher(rec.readShort());
- _securityParameters.setCompression(rec.readByte());
- _securityParameters.setServerRandom(random);
- }
-
- /**
- * Handle HANDSHAKE_CLIENT_HELLO - server side
- */
- private function parseHandshakeClientHello( rec:IDataInput ) : void {
- var ret:Object;
- var ver:uint = rec.readShort();
- if (ver != _securityParameters.version) {
- throw new TLSError("Unsupported TLS version: "+ver.toString(16), TLSError.protocol_version);
- }
-
- var random:ByteArray = new ByteArray;
- rec.readBytes(random, 0, 32);
- var session_length:uint = rec.readByte();
- var session:ByteArray = new ByteArray;
- if (session_length > 0) {
- // some implementations don't assign a session ID
- rec.readBytes(session, 0, session_length);
- }
- var suites:Array = [];
-
- var suites_length:uint = rec.readShort();
- for (var i:uint=0;i<suites_length/2;i++) {
- suites.push(rec.readShort());
- }
-
- var compressions:Array = [];
-
- var comp_length:uint = rec.readByte();
- for (i=0;i<comp_length;i++) {
- compressions.push(rec.readByte());
- }
- ret = {random:random, session:session, suites:suites, compressions:compressions};
-
- var sofar:uint = 2+32+1+session_length+2+suites_length+1+comp_length;
- var extensions:Array = [];
- if (sofar<length) {
- // we have extensions. great.
- var ext_total_length:uint = rec.readShort();
- while (ext_total_length>0) {
- var ext_type:uint = rec.readShort();
- var ext_length:uint = rec.readShort();
- var ext_data:ByteArray = new ByteArray;
- rec.readBytes(ext_data, 0, ext_length);
- ext_total_length -= 4+ext_length;
- extensions.push({type:ext_type, length:ext_length, data:ext_data});
- }
- }
- ret.ext = extensions;
-
- sendServerHello(ret);
- sendCertificate();
- // TODO: Modify to handle case of requesting a certificate from the client, for "client authentication",
- // and testing purposes, will probably never actually need it.
- sendServerHelloDone();
- }
-
- private function sendClientHello():void {
- var rec:ByteArray = new ByteArray;
- // version - modified to support version attribute from ISecurityParameters
- rec.writeShort(_securityParameters.version);
- // random
- var prng:Random = new Random;
- var clientRandom:ByteArray = new ByteArray;
- prng.nextBytes(clientRandom, 32);
- _securityParameters.setClientRandom(clientRandom);
- rec.writeBytes(clientRandom,0,32);
- // session
- rec.writeByte(32);
- prng.nextBytes(rec, 32);
- // Cipher suites
- var cs:Array = _config.cipherSuites;
- rec.writeShort(2* cs.length);
- for (var i:int=0;i<cs.length;i++) {
- rec.writeShort(cs[i]);
- }
- // Compression
- cs = _config.compressions;
- rec.writeByte(cs.length);
- for (i=0;i<cs.length;i++) {
- rec.writeByte(cs[i]);
- }
- // no extensions, yet.
- rec.position = 0;
- sendHandshake(HANDSHAKE_CLIENT_HELLO, rec.length, rec);
- }
-
- private function findMatch(a1:Array, a2:Array):int {
- for (var i:int=0;i<a1.length;i++) {
- var e:uint = a1[i];
- if (a2.indexOf(e)>-1) {
- return e;
- }
- }
- return -1;
- }
-
- private function sendServerHello(v:Object):void {
- var cipher:int = findMatch(_config.cipherSuites, v.suites);
- if (cipher == -1) {
- throw new TLSError("No compatible cipher found.", TLSError.handshake_failure);
- }
- _securityParameters.setCipher(cipher);
-
- var comp:int = findMatch(_config.compressions, v.compressions);
- if (comp == 01) {
- throw new TLSError("No compatible compression method found.", TLSError.handshake_failure);
- }
- _securityParameters.setCompression(comp);
- _securityParameters.setClientRandom(v.random);
- var rec:ByteArray = new ByteArray;
- rec.writeShort(_securityParameters.version);
- var prng:Random = new Random;
- var serverRandom:ByteArray = new ByteArray;
- prng.nextBytes(serverRandom, 32);
- _securityParameters.setServerRandom(serverRandom);
- rec.writeBytes(serverRandom,0,32);
- // session
- rec.writeByte(32);
- prng.nextBytes(rec, 32);
- // Cipher suite
- rec.writeShort(v.suites[0]);
- // Compression
- rec.writeByte(v.compressions[0]);
- rec.position = 0;
- sendHandshake(HANDSHAKE_SERVER_HELLO, rec.length, rec);
- }
-
- private var sendClientCert:Boolean = false;
- private function setStateRespondWithCertificate( r:ByteArray = null) : void {
- sendClientCert = true;
- }
-
- private function sendCertificate( r:ByteArray = null ):void {
- var cert:ByteArray = _config.certificate;
- var len:uint;
- var len2:uint;
- var rec:ByteArray = new ByteArray;
- // Look for a certficate chain, if we have one, send it, if we don't, send an empty record.
- if (cert != null) {
- len = cert.length;
- len2 = cert.length + 3;
- rec.writeByte(len2>>16);
- rec.writeShort(len2&65535);
- rec.writeByte(len>>16);
- rec.writeShort(len&65535);
- rec.writeBytes(cert);
- } else {
- rec.writeShort( 0 );
- rec.writeByte( 0 );
- }
- rec.position = 0;
- sendHandshake(HANDSHAKE_CERTIFICATE, rec.length, rec);
- }
-
- private function sendCertificateVerify():void {
- var rec:ByteArray = new ByteArray();
- // Encrypt the handshake payloads here
- var data:ByteArray = _securityParameters.computeCertificateVerify(_entity, _handshakePayloads);
- data.position=0;
- sendHandshake(HANDSHAKE_CERTIFICATE_VERIFY, data.length, data);
- }
-
- private function sendServerHelloDone():void {
- var rec:ByteArray = new ByteArray;
- sendHandshake(HANDSHAKE_HELLO_DONE, rec.length, rec);
- }
-
- private function sendClientKeyExchange():void {
- if (_securityParameters.useRSA) {
- var p:ByteArray = new ByteArray;
- p.writeShort(_securityParameters.version);
- var prng:Random = new Random;
- prng.nextBytes(p, 46);
- p.position = 0;
- var preMasterSecret:ByteArray = new ByteArray;
- preMasterSecret.writeBytes(p, 0, p.length);
- preMasterSecret.position = 0;
- _securityParameters.setPreMasterSecret(preMasterSecret);
-
- var enc_key:ByteArray = new ByteArray;
- _otherCertificate.getPublicKey().encrypt(preMasterSecret, enc_key, preMasterSecret.length);
-
- enc_key.position = 0;
- var rec:ByteArray = new ByteArray;
-
- // TLS requires the size of the premaster key be sent BUT
- // SSL 3.0 does not
- if (_securityParameters.version > 0x0300) {
- rec.writeShort(enc_key.length);
- }
- rec.writeBytes(enc_key, 0, enc_key.length);
-
- rec.position=0;
-
- sendHandshake(HANDSHAKE_CLIENT_KEY_EXCHANGE, rec.length, rec);
-
- // now is a good time to get our pending states
- var o:Object = _securityParameters.getConnectionStates();
- _pendingReadState = o.read;
- _pendingWriteState = o.write;
-
- } else {
- throw new TLSError("Non-RSA Client Key Exchange not implemented.", TLSError.internal_error);
- }
- }
- private function sendFinished():void {
- var data:ByteArray = _securityParameters.computeVerifyData(_entity, _handshakePayloads);
- data.position=0;
- sendHandshake(HANDSHAKE_FINISHED, data.length, data);
- }
-
- private function sendHandshake(type:uint, len:uint, payload:IDataInput):void {
- var rec:ByteArray = new ByteArray;
- rec.writeByte(type);
- rec.writeByte(0);
- rec.writeShort(len);
- payload.readBytes(rec, rec.position, len);
- _handshakePayloads.writeBytes(rec, 0, rec.length);
- sendRecord(PROTOCOL_HANDSHAKE, rec);
- }
-
- private function sendChangeCipherSpec():void {
- var rec:ByteArray = new ByteArray;
- rec[0] = 1;
- sendRecord(PROTOCOL_CHANGE_CIPHER_SPEC, rec);
-
- // right after, switch the cipher for writing.
- _currentWriteState = _pendingWriteState;
- _pendingWriteState = null;
- }
-
- public function sendApplicationData(data:ByteArray, offset:uint=0, length:uint=0):void {
- var rec:ByteArray = new ByteArray;
- var len:uint = length;
- // BIG FAT WARNING: Patch from Arlen Cuss ALA As3crypto group on Google code.
- // This addresses data overflow issues when the packet size hits the max length boundary.
- if (len == 0) len = data.length;
- while (len>16384) {
- rec.position = 0;
- rec.writeBytes(data, offset, 16384);
- rec.position = 0;
- sendRecord(PROTOCOL_APPLICATION_DATA, rec);
- offset += 16384;
- len -= 16384;
- }
- rec.position = 0;
- rec.writeBytes(data, offset, len);
- // trace("Data I'm sending..." + Hex.fromArray( data ));
- rec.position = 0;
- sendRecord(PROTOCOL_APPLICATION_DATA, rec);
- }
- private function sendRecord(type:uint, payload:ByteArray):void {
- // encrypt
- payload = _currentWriteState.encrypt(type, payload);
-
- _oStream.writeByte(type);
- _oStream.writeShort(_securityParameters.version);
- _oStream.writeShort(payload.length);
- _oStream.writeBytes(payload, 0, payload.length);
-
- scheduleWrite();
- }
-
- private var _writeScheduler:uint;
- private function scheduleWrite():void {
- if (_writeScheduler!=0) return;
- _writeScheduler = setTimeout(commitWrite, 0);
- }
- private function commitWrite():void {
- clearTimeout(_writeScheduler);
- _writeScheduler = 0;
- if (_state != STATE_CLOSED) {
- dispatchEvent(new ProgressEvent(ProgressEvent.SOCKET_DATA));
- }
- }
-
- private function sendClientAck( rec:ByteArray ):void {
- if ( _handshakeCanContinue ) {
- // If I have a pending cert request, send it
- if (sendClientCert)
- sendCertificate();
- // send a client key exchange
- sendClientKeyExchange();
- // Send the certificate verify, if we have one
- if (_config.certificate != null)
- sendCertificateVerify();
- // send a change cipher spec
- sendChangeCipherSpec();
- // send a finished
- sendFinished();
- }
- }
- /**
- * Vaguely gross function that parses a RSA key out of a certificate.
- *
- * As long as that certificate looks just the way we expect it to.
- *
- */
- private function loadCertificates( rec:ByteArray ):void {
- var tmp:uint = rec.readByte();
- var certs_len:uint = (tmp<<16) | rec.readShort();
- var certs:Array = [];
-
- while (certs_len>0) {
- tmp = rec.readByte();
- var cert_len:uint = (tmp<<16) | rec.readShort();
- var cert:ByteArray = new ByteArray;
- rec.readBytes(cert, 0, cert_len);
- certs.push(cert);
- certs_len -= 3 + cert_len;
- }
-
- var firstCert:X509Certificate = null;
- for (var i:int=0;i<certs.length;i++) {
- var x509:X509Certificate = new X509Certificate(certs[i]);
- _store.addCertificate(x509);
- if (firstCert==null) {
- firstCert = x509;
- }
- }
-
- // Test first for trust override parameters
- // This nice trust override stuff comes from Joey Parrish via As3crypto forums
- var certTrusted:Boolean;
- if (_config.trustAllCertificates) {
- certTrusted = true; // Blatantly trust everything
- } else if (_config.trustSelfSignedCertificates ) {
- // Self-signed certs
- certTrusted = firstCert.isSelfSigned(new Date);
- } else {
- // Certs with a signer in the CA store - realistically, I should setup an event chain to handle this
- certTrusted = firstCert.isSigned(_store, _config.CAStore );
- }
-
- // Good so far
- if (certTrusted) {
- // ok, that's encouraging. now for the hostname match.
- if (_otherIdentity==null || _config.ignoreCommonNameMismatch ) {
- // we don't care who we're talking with. groovy.
- _otherCertificate = firstCert;
- } else {
- // use regex to handle wildcard certs
- var commonName:String = firstCert.getCommonName();
- // replace all regex special characters with escaped version, except for asterisk
- // replace the asterisk with a regex sequence to match one or more non-dot characters
- var commonNameRegex:RegExp = new RegExp( commonName.replace(/[\^\\\-$.[\]|()?+{}]/g, "\\$&").replace(/\*/g, "[^.]+"), "gi");
- if (commonNameRegex.exec(_otherIdentity)) {
- _otherCertificate = firstCert;
- } else {
- if (_config.promptUserForAcceptCert ) {
- _handshakeCanContinue = false;
- dispatchEvent( new TLSEvent( TLSEvent.PROMPT_ACCEPT_CERT ));
- } else {
- throw new TLSError("Invalid common name: "+firstCert.getCommonName()+", expected "+_otherIdentity, TLSError.bad_certificate);
- }
- }
- }
-
- } else {
- // Let's ask the user if we can accept this cert. I'm not certain of the behaviour in case of timeouts,
- // so I probably need to handle the case by killing and restarting the connection rather than continuing if it becomes
- // an issue. We shall see. BP
- if (_config.promptUserForAcceptCert) {
- _handshakeCanContinue = false;
- dispatchEvent( new TLSEvent( TLSEvent.PROMPT_ACCEPT_CERT ));
- } else {
- // Cannot continue, die.
- throw new TLSError("Cannot verify certificate", TLSError.bad_certificate);
- }
- }
- }
-
- // Accept the peer cert, and keep going
- public function acceptPeerCertificate() : void {
- _handshakeCanContinue = true;
- sendClientAck( null );
- }
-
- // Step off biotch! No trust for you!
- public function rejectPeerCertificate() : void {
- throw new TLSError("Peer certificate not accepted!", TLSError.bad_certificate);
- }
-
-
- private function parseAlert(p:ByteArray):void {
- //throw new Error("Alert not implemented.");
- // 7.2
- trace("GOT ALERT! type="+p[1]);
- close();
- }
- private function parseChangeCipherSpec(p:ByteArray):void {
- p.readUnsignedByte();
- if (_pendingReadState==null) {
- throw new TLSError("Not ready to Change Cipher Spec, damnit.", TLSError.unexpected_message);
- }
- _currentReadState = _pendingReadState;
- _pendingReadState = null;
- // 7.1
- }
- private function parseApplicationData(p:ByteArray):void {
- if (_state != STATE_READY) {
- throw new TLSError("Too soon for data!", TLSError.unexpected_message);
- return;
- }
- dispatchEvent(new TLSEvent(TLSEvent.DATA, p));
- }
-
- private function handleTLSError(e:TLSError):void {
- // basic rules to keep things simple:
- // - Make a good faith attempt at notifying peers
- // - TLSErrors are always fatal.
- // BP: Meh...not always. Common Name mismatches appear to be common on servers. Instead of closing, let's pause, and ask for confirmation
- // before we tear the connection down.
-
- close(e);
- }
- }
- }