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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
'use strict';
/** @suppress {duplicate} */
var remoting = remoting || {};
/**
* XmppLoginHandler handles authentication handshake for XmppConnection. It
* receives incoming data using onDataReceived(), calls |sendMessageCallback|
* to send outgoing messages and calls |onHandshakeDoneCallback| after
* authentication is finished successfully or |onErrorCallback| on error.
*
* See RFC3920 for description of XMPP and authentication handshake.
*
* @param {string} server Domain name of the server we are connecting to.
* @param {string} username Username.
* @param {string} authToken OAuth2 token.
* @param {boolean} needHandshakeBeforeTls Set to true when <starttls> handshake
* is required before starting TLS. Otherwise TLS can be started right away.
* @param {function(string):void} sendMessageCallback Callback to call to send
* a message.
* @param {function():void} startTlsCallback Callback to call to start TLS on
* the underlying socket.
* @param {function(string, remoting.XmppStreamParser):void}
* onHandshakeDoneCallback Callback to call after authentication is
* completed successfully
* @param {function(!remoting.Error, string):void} onErrorCallback Callback to
* call on error. Can be called at any point during lifetime of connection.
* @constructor
*/
remoting.XmppLoginHandler = function(server,
username,
authToken,
needHandshakeBeforeTls,
sendMessageCallback,
startTlsCallback,
onHandshakeDoneCallback,
onErrorCallback) {
/** @private */
this.server_ = server;
/** @private */
this.username_ = username;
/** @private */
this.authToken_ = authToken;
/** @private */
this.needHandshakeBeforeTls_ = needHandshakeBeforeTls;
/** @private */
this.sendMessageCallback_ = sendMessageCallback;
/** @private */
this.startTlsCallback_ = startTlsCallback;
/** @private */
this.onHandshakeDoneCallback_ = onHandshakeDoneCallback;
/** @private */
this.onErrorCallback_ = onErrorCallback;
/** @private */
this.state_ = remoting.XmppLoginHandler.State.INIT;
/** @private */
this.jid_ = '';
/** @private {remoting.XmppStreamParser} */
this.streamParser_ = null;
}
/** @return {function(string, remoting.XmppStreamParser):void} */
remoting.XmppLoginHandler.prototype.getHandshakeDoneCallbackForTesting =
function() {
return this.onHandshakeDoneCallback_;
};
/**
* States the handshake goes through. States are iterated from INIT to DONE
* sequentially, except for ERROR state which may be accepted at any point.
*
* Following messages are sent/received in each state:
* INIT
* client -> server: Stream header
* client -> server: <starttls>
* WAIT_STREAM_HEADER
* client <- server: Stream header with list of supported features which
* should include starttls.
* WAIT_STARTTLS_RESPONSE
* client <- server: <proceed>
* STARTING_TLS
* TLS handshake
* client -> server: Stream header
* client -> server: <auth> message with the OAuth2 token.
* WAIT_STREAM_HEADER_AFTER_TLS
* client <- server: Stream header with list of supported authentication
* methods which is expected to include X-OAUTH2
* WAIT_AUTH_RESULT
* client <- server: <success> or <failure>
* client -> server: Stream header
* client -> server: <bind>
* client -> server: <iq><session/></iq> to start the session
* WAIT_STREAM_HEADER_AFTER_AUTH
* client <- server: Stream header with list of features that should
* include <bind>.
* WAIT_BIND_RESULT
* client <- server: <bind> result with JID.
* WAIT_SESSION_IQ_RESULT
* client <- server: result for <iq><session/></iq>
* DONE
*
* @enum {number}
*/
remoting.XmppLoginHandler.State = {
INIT: 0,
WAIT_STREAM_HEADER: 1,
WAIT_STARTTLS_RESPONSE: 2,
STARTING_TLS: 3,
WAIT_STREAM_HEADER_AFTER_TLS: 4,
WAIT_AUTH_RESULT: 5,
WAIT_STREAM_HEADER_AFTER_AUTH: 6,
WAIT_BIND_RESULT: 7,
WAIT_SESSION_IQ_RESULT: 8,
DONE: 9,
ERROR: 10
};
remoting.XmppLoginHandler.prototype.start = function() {
if (this.needHandshakeBeforeTls_) {
this.state_ = remoting.XmppLoginHandler.State.WAIT_STREAM_HEADER;
this.startStream_('<starttls xmlns="urn:ietf:params:xml:ns:xmpp-tls"/>');
} else {
// If <starttls> handshake is not required then start TLS right away.
this.state_ = remoting.XmppLoginHandler.State.STARTING_TLS;
this.startTlsCallback_();
}
}
/** @param {ArrayBuffer} data */
remoting.XmppLoginHandler.prototype.onDataReceived = function(data) {
base.debug.assert(this.state_ != remoting.XmppLoginHandler.State.INIT &&
this.state_ != remoting.XmppLoginHandler.State.DONE &&
this.state_ != remoting.XmppLoginHandler.State.ERROR);
this.streamParser_.appendData(data);
}
/**
* @param {Element} stanza
* @private
*/
remoting.XmppLoginHandler.prototype.onStanza_ = function(stanza) {
switch (this.state_) {
case remoting.XmppLoginHandler.State.WAIT_STREAM_HEADER:
if (stanza.querySelector('features>starttls')) {
this.state_ = remoting.XmppLoginHandler.State.WAIT_STARTTLS_RESPONSE;
} else {
this.onError_(
remoting.Error.unexpected(),
"Server doesn't support TLS.");
}
break;
case remoting.XmppLoginHandler.State.WAIT_STARTTLS_RESPONSE:
if (stanza.localName == "proceed") {
this.state_ = remoting.XmppLoginHandler.State.STARTING_TLS;
this.startTlsCallback_();
} else {
this.onError_(remoting.Error.unexpected(),
"Failed to start TLS: " +
(new XMLSerializer().serializeToString(stanza)));
}
break;
case remoting.XmppLoginHandler.State.WAIT_STREAM_HEADER_AFTER_TLS:
var mechanisms = Array.prototype.map.call(
stanza.querySelectorAll('features>mechanisms>mechanism'),
/** @param {Element} m */
function(m) { return m.textContent; });
if (mechanisms.indexOf("X-OAUTH2")) {
this.onError_(remoting.Error.unexpected(),
"OAuth2 is not supported by the server.");
return;
}
this.state_ = remoting.XmppLoginHandler.State.WAIT_AUTH_RESULT;
break;
case remoting.XmppLoginHandler.State.WAIT_AUTH_RESULT:
if (stanza.localName == 'success') {
this.state_ =
remoting.XmppLoginHandler.State.WAIT_STREAM_HEADER_AFTER_AUTH;
this.startStream_(
'<iq type="set" id="0">' +
'<bind xmlns="urn:ietf:params:xml:ns:xmpp-bind">' +
'<resource>chromoting</resource>'+
'</bind>' +
'</iq>' +
'<iq type="set" id="1">' +
'<session xmlns="urn:ietf:params:xml:ns:xmpp-session"/>' +
'</iq>');
} else {
this.onError_(
new remoting.Error(remoting.Error.Tag.AUTHENTICATION_FAILED),
'Failed to authenticate: ' +
(new XMLSerializer().serializeToString(stanza)));
}
break;
case remoting.XmppLoginHandler.State.WAIT_STREAM_HEADER_AFTER_AUTH:
if (stanza.querySelector('features>bind')) {
this.state_ = remoting.XmppLoginHandler.State.WAIT_BIND_RESULT;
} else {
this.onError_(remoting.Error.unexpected(),
"Server doesn't support bind after authentication.");
}
break;
case remoting.XmppLoginHandler.State.WAIT_BIND_RESULT:
var jidElement = stanza.querySelector('iq>bind>jid');
if (stanza.getAttribute('id') != '0' ||
stanza.getAttribute('type') != 'result' || !jidElement) {
this.onError_(remoting.Error.unexpected(),
'Received unexpected response to bind: ' +
(new XMLSerializer().serializeToString(stanza)));
return;
}
this.jid_ = jidElement.textContent;
this.state_ = remoting.XmppLoginHandler.State.WAIT_SESSION_IQ_RESULT;
break;
case remoting.XmppLoginHandler.State.WAIT_SESSION_IQ_RESULT:
if (stanza.getAttribute('id') != '1' ||
stanza.getAttribute('type') != 'result') {
this.onError_(remoting.Error.unexpected(),
'Failed to start session: ' +
(new XMLSerializer().serializeToString(stanza)));
return;
}
this.state_ = remoting.XmppLoginHandler.State.DONE;
this.onHandshakeDoneCallback_(this.jid_, this.streamParser_);
break;
default:
base.debug.assert(false);
break;
}
}
remoting.XmppLoginHandler.prototype.onTlsStarted = function() {
base.debug.assert(this.state_ ==
remoting.XmppLoginHandler.State.STARTING_TLS);
this.state_ = remoting.XmppLoginHandler.State.WAIT_STREAM_HEADER_AFTER_TLS;
var cookie = window.btoa("\0" + this.username_ + "\0" + this.authToken_);
this.startStream_(
'<auth xmlns="urn:ietf:params:xml:ns:xmpp-sasl" ' +
'mechanism="X-OAUTH2" auth:service="oauth2" ' +
'auth:allow-generated-jid="true" ' +
'auth:client-uses-full-bind-result="true" ' +
'auth:allow-non-google-login="true" ' +
'xmlns:auth="http://www.google.com/talk/protocol/auth">' +
cookie +
'</auth>');
};
/**
* @param {string} text
* @private
*/
remoting.XmppLoginHandler.prototype.onParserError_ = function(text) {
this.onError_(remoting.Error.unexpected(), text);
}
/**
* @param {string} firstMessage Message to send after stream header.
* @private
*/
remoting.XmppLoginHandler.prototype.startStream_ = function(firstMessage) {
this.sendMessageCallback_('<stream:stream to="' + this.server_ +
'" version="1.0" xmlns="jabber:client" ' +
'xmlns:stream="http://etherx.jabber.org/streams">' +
firstMessage);
this.streamParser_ = new remoting.XmppStreamParser();
this.streamParser_.setCallbacks(this.onStanza_.bind(this),
this.onParserError_.bind(this));
}
/**
* @param {!remoting.Error} error
* @param {string} text
* @private
*/
remoting.XmppLoginHandler.prototype.onError_ = function(error, text) {
if (this.state_ != remoting.XmppLoginHandler.State.ERROR) {
this.onErrorCallback_(error, text);
this.state_ = remoting.XmppLoginHandler.State.ERROR;
} else {
console.error(text);
}
}
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