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590 lines
20 KiB
JavaScript
590 lines
20 KiB
JavaScript
/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Firefox Sync.
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*
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* The Initial Developer of the Original Code is
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* Mozilla Foundation.
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* Portions created by the Initial Developer are Copyright (C) 2010
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Philipp von Weitershausen <philipp@weitershausen.de>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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const Cc = Components.classes;
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const Ci = Components.interfaces;
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const Cr = Components.results;
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const Cu = Components.utils;
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Cu.import("resource://services-sync/log4moz.js");
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Cu.import("resource://services-sync/resource.js");
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Cu.import("resource://services-sync/constants.js");
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Cu.import("resource://services-sync/util.js");
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const EXPORTED_SYMBOLS = ["JPAKEClient"];
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const JPAKE_SIGNERID_SENDER = "sender";
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const JPAKE_SIGNERID_RECEIVER = "receiver";
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const JPAKE_LENGTH_SECRET = 8;
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const JPAKE_LENGTH_CLIENTID = 256;
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const JPAKE_VERIFY_VALUE = "0123456789ABCDEF";
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/*
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* Client to exchange encrypted data using the J-PAKE algorithm.
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* The exchange between two clients of this type looks like this:
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*
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*
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* Client A Server Client B
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* ==================================================================
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* |
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* retrieve channel <---------------|
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* generate random secret |
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* show PIN = secret + channel | ask user for PIN
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* upload A's message 1 ----------->|
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* |--------> retrieve A's message 1
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* |<---------- upload B's message 1
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* retrieve B's message 1 <---------|
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* upload A's message 2 ----------->|
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* |--------> retrieve A's message 2
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* | compute key
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* |<---------- upload B's message 2
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* retrieve B's message 2 <---------|
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* compute key |
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* upload sha256d(key) ------------>|
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* |---------> retrieve sha256d(key)
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* | verify against own key
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* | encrypt data
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* |<------------------- upload data
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* retrieve data <------------------|
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* verify HMAC |
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* decrypt data |
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*
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*
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* Create a client object like so:
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*
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* let client = new JPAKEClient(observer);
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*
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* The 'observer' object must implement the following methods:
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*
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* displayPIN(pin) -- Display the PIN to the user, only called on the client
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* that didn't provide the PIN.
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*
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* onComplete(data) -- Called after transfer has been completed. On
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* the sending side this is called with no parameter and as soon as the
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* data has been uploaded, which this doesn't mean the receiving side
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* has actually retrieved them yet.
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*
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* onAbort(error) -- Called whenever an error is encountered. All errors lead
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* to an abort and the process has to be started again on both sides.
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*
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* To start the data transfer on the receiving side, call
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*
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* client.receiveNoPIN();
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*
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* This will allocate a new channel on the server, generate a PIN, have it
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* displayed and then do the transfer once the protocol has been completed
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* with the sending side.
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*
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* To initiate the transfer from the sending side, call
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*
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* client.sendWithPIN(pin, data)
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*
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* To abort the process, call
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*
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* client.abort();
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*
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* Note that after completion or abort, the 'client' instance may not be reused.
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* You will have to create a new one in case you'd like to restart the process.
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*/
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function JPAKEClient(observer) {
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this.observer = observer;
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this._log = Log4Moz.repository.getLogger("Service.JPAKEClient");
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this._log.level = Log4Moz.Level[Svc.Prefs.get(
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"log.logger.service.jpakeclient", "Debug")];
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this._serverUrl = Svc.Prefs.get("jpake.serverURL");
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this._pollInterval = Svc.Prefs.get("jpake.pollInterval");
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this._maxTries = Svc.Prefs.get("jpake.maxTries");
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if (this._serverUrl.slice(-1) != "/")
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this._serverUrl += "/";
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this._jpake = Cc["@mozilla.org/services-crypto/sync-jpake;1"]
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.createInstance(Ci.nsISyncJPAKE);
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this._auth = new NoOpAuthenticator();
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this._setClientID();
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}
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JPAKEClient.prototype = {
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_chain: Utils.asyncChain,
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/*
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* Public API
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*/
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receiveNoPIN: function receiveNoPIN() {
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this._my_signerid = JPAKE_SIGNERID_RECEIVER;
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this._their_signerid = JPAKE_SIGNERID_SENDER;
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this._secret = this._createSecret();
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// Allow a large number of tries first while we wait for the PIN
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// to be entered on the other device.
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this._maxTries = Svc.Prefs.get("jpake.firstMsgMaxTries");
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this._chain(this._getChannel,
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this._computeStepOne,
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this._putStep,
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this._getStep,
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function(callback) {
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// Now we can switch back to the smaller timeout.
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this._maxTries = Svc.Prefs.get("jpake.maxTries");
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callback();
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},
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this._computeStepTwo,
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this._putStep,
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this._getStep,
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this._computeFinal,
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this._computeKeyVerification,
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this._putStep,
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this._getStep,
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this._decryptData,
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this._complete)();
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},
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sendWithPIN: function sendWithPIN(pin, obj) {
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this._my_signerid = JPAKE_SIGNERID_SENDER;
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this._their_signerid = JPAKE_SIGNERID_RECEIVER;
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this._channel = pin.slice(JPAKE_LENGTH_SECRET);
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this._channelUrl = this._serverUrl + this._channel;
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this._secret = pin.slice(0, JPAKE_LENGTH_SECRET);
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this._data = JSON.stringify(obj);
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this._chain(this._computeStepOne,
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this._getStep,
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this._putStep,
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this._computeStepTwo,
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this._getStep,
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this._putStep,
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this._computeFinal,
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this._getStep,
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this._encryptData,
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this._putStep,
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this._complete)();
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},
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abort: function abort(error) {
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this._log.debug("Aborting...");
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this._finished = true;
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let self = this;
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if (error == JPAKE_ERROR_CHANNEL
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|| error == JPAKE_ERROR_NETWORK
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|| error == JPAKE_ERROR_NODATA) {
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Utils.delay(function() { this.observer.onAbort(error); }, 0,
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this, "_timer_onAbort");
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} else {
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this._reportFailure(error, function() { self.observer.onAbort(error); });
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}
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},
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/*
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* Utilities
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*/
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_setClientID: function _setClientID() {
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let rng = Cc["@mozilla.org/security/random-generator;1"]
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.createInstance(Ci.nsIRandomGenerator);
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let bytes = rng.generateRandomBytes(JPAKE_LENGTH_CLIENTID / 2);
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this._clientID = [("0" + byte.toString(16)).slice(-2)
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for each (byte in bytes)].join("");
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},
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_createSecret: function _createSecret() {
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// 0-9a-z without 1,l,o,0
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const key = "23456789abcdefghijkmnpqrstuvwxyz";
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let rng = Cc["@mozilla.org/security/random-generator;1"]
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.createInstance(Ci.nsIRandomGenerator);
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let bytes = rng.generateRandomBytes(JPAKE_LENGTH_SECRET);
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return [key[Math.floor(byte * key.length / 256)]
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for each (byte in bytes)].join("");
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},
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/*
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* Steps of J-PAKE procedure
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*/
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_getChannel: function _getChannel(callback) {
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this._log.trace("Requesting channel.");
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let resource = new AsyncResource(this._serverUrl + "new_channel");
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resource.authenticator = this._auth;
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resource.setHeader("X-KeyExchange-Id", this._clientID);
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resource.get(Utils.bind2(this, function handleChannel(error, response) {
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if (this._finished)
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return;
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if (error) {
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this._log.error("Error acquiring channel ID. " + error);
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this.abort(JPAKE_ERROR_CHANNEL);
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return;
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}
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if (response.status != 200) {
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this._log.error("Error acquiring channel ID. Server responded with HTTP "
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+ response.status);
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this.abort(JPAKE_ERROR_CHANNEL);
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return;
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}
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let channel;
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try {
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this._channel = response.obj;
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} catch (ex) {
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this._log.error("Server responded with invalid JSON.");
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this.abort(JPAKE_ERROR_CHANNEL);
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return;
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}
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this._log.debug("Using channel " + this._channel);
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this._channelUrl = this._serverUrl + this._channel;
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// Don't block on UI code.
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let pin = this._secret + this._channel;
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Utils.delay(function() { this.observer.displayPIN(pin); }, 0,
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this, "_timer_displayPIN");
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callback();
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}));
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},
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// Generic handler for uploading data.
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_putStep: function _putStep(callback) {
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this._log.trace("Uploading message " + this._outgoing.type);
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let resource = new AsyncResource(this._channelUrl);
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resource.authenticator = this._auth;
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resource.setHeader("X-KeyExchange-Id", this._clientID);
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resource.put(this._outgoing, Utils.bind2(this, function (error, response) {
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if (this._finished)
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return;
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if (error) {
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this._log.error("Error uploading data. " + error);
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this.abort(JPAKE_ERROR_NETWORK);
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return;
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}
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if (response.status != 200) {
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this._log.error("Could not upload data. Server responded with HTTP "
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+ response.status);
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this.abort(JPAKE_ERROR_SERVER);
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return;
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}
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// There's no point in returning early here since the next step will
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// always be a GET so let's pause for twice the poll interval.
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this._etag = response.headers["etag"];
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Utils.delay(function () { callback(); }, this._pollInterval * 2, this,
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"_pollTimer");
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}));
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},
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// Generic handler for polling for and retrieving data.
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_pollTries: 0,
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_getStep: function _getStep(callback) {
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this._log.trace("Retrieving next message.");
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let resource = new AsyncResource(this._channelUrl);
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resource.authenticator = this._auth;
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resource.setHeader("X-KeyExchange-Id", this._clientID);
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if (this._etag)
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resource.setHeader("If-None-Match", this._etag);
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resource.get(Utils.bind2(this, function (error, response) {
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if (this._finished)
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return;
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if (error) {
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this._log.error("Error fetching data. " + error);
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this.abort(JPAKE_ERROR_NETWORK);
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return;
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}
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if (response.status == 304) {
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this._log.trace("Channel hasn't been updated yet. Will try again later.");
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if (this._pollTries >= this._maxTries) {
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this._log.error("Tried for " + this._pollTries + " times, aborting.");
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this.abort(JPAKE_ERROR_TIMEOUT);
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return;
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}
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this._pollTries += 1;
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Utils.delay(function() { this._getStep(callback); },
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this._pollInterval, this, "_pollTimer");
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return;
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}
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this._pollTries = 0;
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if (response.status == 404) {
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this._log.error("No data found in the channel.");
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this.abort(JPAKE_ERROR_NODATA);
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return;
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}
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if (response.status != 200) {
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this._log.error("Could not retrieve data. Server responded with HTTP "
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+ response.status);
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this.abort(JPAKE_ERROR_SERVER);
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return;
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}
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try {
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this._incoming = response.obj;
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} catch (ex) {
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this._log.error("Server responded with invalid JSON.");
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this.abort(JPAKE_ERROR_INVALID);
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return;
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}
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this._log.trace("Fetched message " + this._incoming.type);
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callback();
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}));
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},
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_reportFailure: function _reportFailure(reason, callback) {
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this._log.debug("Reporting failure to server.");
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let resource = new AsyncResource(this._serverUrl + "report");
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resource.authenticator = this._auth;
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resource.setHeader("X-KeyExchange-Id", this._clientID);
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resource.setHeader("X-KeyExchange-Cid", this._channel);
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resource.setHeader("X-KeyExchange-Log", reason);
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resource.post("", Utils.bind2(this, function (error, response) {
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if (error)
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this._log.warn("Report failed: " + error);
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else if (response.status != 200)
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this._log.warn("Report failed. Server responded with HTTP "
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+ response.status);
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// Do not block on errors, we're done or aborted by now anyway.
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callback();
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}));
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},
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_computeStepOne: function _computeStepOne(callback) {
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this._log.trace("Computing round 1.");
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let gx1 = {};
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let gv1 = {};
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let r1 = {};
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let gx2 = {};
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let gv2 = {};
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let r2 = {};
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try {
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this._jpake.round1(this._my_signerid, gx1, gv1, r1, gx2, gv2, r2);
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} catch (ex) {
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this._log.error("JPAKE round 1 threw: " + ex);
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this.abort(JPAKE_ERROR_INTERNAL);
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return;
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}
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let one = {gx1: gx1.value,
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gx2: gx2.value,
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zkp_x1: {gr: gv1.value, b: r1.value, id: this._my_signerid},
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zkp_x2: {gr: gv2.value, b: r2.value, id: this._my_signerid}};
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this._outgoing = {type: this._my_signerid + "1", payload: one};
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this._log.trace("Generated message " + this._outgoing.type);
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callback();
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},
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_computeStepTwo: function _computeStepTwo(callback) {
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this._log.trace("Computing round 2.");
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if (this._incoming.type != this._their_signerid + "1") {
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this._log.error("Invalid round 1 message: "
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+ JSON.stringify(this._incoming));
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this.abort(JPAKE_ERROR_WRONGMESSAGE);
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return;
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}
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let step1 = this._incoming.payload;
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if (!step1 || !step1.zkp_x1 || step1.zkp_x1.id != this._their_signerid
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|| !step1.zkp_x2 || step1.zkp_x2.id != this._their_signerid) {
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this._log.error("Invalid round 1 payload: " + JSON.stringify(step1));
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this.abort(JPAKE_ERROR_WRONGMESSAGE);
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return;
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}
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let A = {};
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let gvA = {};
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let rA = {};
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try {
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this._jpake.round2(this._their_signerid, this._secret,
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step1.gx1, step1.zkp_x1.gr, step1.zkp_x1.b,
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step1.gx2, step1.zkp_x2.gr, step1.zkp_x2.b,
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A, gvA, rA);
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} catch (ex) {
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this._log.error("JPAKE round 2 threw: " + ex);
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this.abort(JPAKE_ERROR_INTERNAL);
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return;
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}
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let two = {A: A.value,
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zkp_A: {gr: gvA.value, b: rA.value, id: this._my_signerid}};
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this._outgoing = {type: this._my_signerid + "2", payload: two};
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this._log.trace("Generated message " + this._outgoing.type);
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callback();
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},
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_computeFinal: function _computeFinal(callback) {
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if (this._incoming.type != this._their_signerid + "2") {
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this._log.error("Invalid round 2 message: "
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+ JSON.stringify(this._incoming));
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this.abort(JPAKE_ERROR_WRONGMESSAGE);
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return;
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}
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let step2 = this._incoming.payload;
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if (!step2 || !step2.zkp_A || step2.zkp_A.id != this._their_signerid) {
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this._log.error("Invalid round 2 payload: " + JSON.stringify(step1));
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this.abort(JPAKE_ERROR_WRONGMESSAGE);
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return;
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}
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let aes256Key = {};
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let hmac256Key = {};
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try {
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this._jpake.final(step2.A, step2.zkp_A.gr, step2.zkp_A.b, HMAC_INPUT,
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aes256Key, hmac256Key);
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} catch (ex) {
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this._log.error("JPAKE final round threw: " + ex);
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this.abort(JPAKE_ERROR_INTERNAL);
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return;
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}
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this._crypto_key = aes256Key.value;
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let hmac_key = Utils.makeHMACKey(Utils.safeAtoB(hmac256Key.value));
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this._hmac_hasher = Utils.makeHMACHasher(Ci.nsICryptoHMAC.SHA256, hmac_key);
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callback();
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},
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_computeKeyVerification: function _computeKeyVerification(callback) {
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this._log.trace("Encrypting key verification value.");
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let iv, ciphertext;
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try {
|
|
iv = Svc.Crypto.generateRandomIV();
|
|
ciphertext = Svc.Crypto.encrypt(JPAKE_VERIFY_VALUE,
|
|
this._crypto_key, iv);
|
|
} catch (ex) {
|
|
this._log.error("Failed to encrypt key verification value.");
|
|
this.abort(JPAKE_ERROR_INTERNAL);
|
|
return;
|
|
}
|
|
this._outgoing = {type: this._my_signerid + "3",
|
|
payload: {ciphertext: ciphertext, IV: iv}};
|
|
this._log.trace("Generated message " + this._outgoing.type);
|
|
callback();
|
|
},
|
|
|
|
_encryptData: function _encryptData(callback) {
|
|
this._log.trace("Verifying their key.");
|
|
if (this._incoming.type != this._their_signerid + "3") {
|
|
this._log.error("Invalid round 3 data: " +
|
|
JSON.stringify(this._incoming));
|
|
this.abort(JPAKE_ERROR_WRONGMESSAGE);
|
|
return;
|
|
}
|
|
let step3 = this._incoming.payload;
|
|
try {
|
|
ciphertext = Svc.Crypto.encrypt(JPAKE_VERIFY_VALUE,
|
|
this._crypto_key, step3.IV);
|
|
if (ciphertext != step3.ciphertext)
|
|
throw "Key mismatch!";
|
|
} catch (ex) {
|
|
this._log.error("Keys don't match!");
|
|
this.abort(JPAKE_ERROR_KEYMISMATCH);
|
|
return;
|
|
}
|
|
|
|
this._log.trace("Encrypting data.");
|
|
let iv, ciphertext, hmac;
|
|
try {
|
|
iv = Svc.Crypto.generateRandomIV();
|
|
ciphertext = Svc.Crypto.encrypt(this._data, this._crypto_key, iv);
|
|
hmac = Utils.bytesAsHex(Utils.digestUTF8(ciphertext, this._hmac_hasher));
|
|
} catch (ex) {
|
|
this._log.error("Failed to encrypt data.");
|
|
this.abort(JPAKE_ERROR_INTERNAL);
|
|
return;
|
|
}
|
|
this._outgoing = {type: this._my_signerid + "3",
|
|
payload: {ciphertext: ciphertext, IV: iv, hmac: hmac}};
|
|
this._log.trace("Generated message " + this._outgoing.type);
|
|
callback();
|
|
},
|
|
|
|
_decryptData: function _decryptData(callback) {
|
|
this._log.trace("Verifying their key.");
|
|
if (this._incoming.type != this._their_signerid + "3") {
|
|
this._log.error("Invalid round 3 data: "
|
|
+ JSON.stringify(this._incoming));
|
|
this.abort(JPAKE_ERROR_WRONGMESSAGE);
|
|
return;
|
|
}
|
|
let step3 = this._incoming.payload;
|
|
try {
|
|
let hmac = Utils.bytesAsHex(
|
|
Utils.digestUTF8(step3.ciphertext, this._hmac_hasher));
|
|
if (hmac != step3.hmac)
|
|
throw "HMAC validation failed!";
|
|
} catch (ex) {
|
|
this._log.error("HMAC validation failed.");
|
|
this.abort(JPAKE_ERROR_KEYMISMATCH);
|
|
return;
|
|
}
|
|
|
|
this._log.trace("Decrypting data.");
|
|
let cleartext;
|
|
try {
|
|
cleartext = Svc.Crypto.decrypt(step3.ciphertext, this._crypto_key,
|
|
step3.IV);
|
|
} catch (ex) {
|
|
this._log.error("Failed to decrypt data.");
|
|
this.abort(JPAKE_ERROR_INTERNAL);
|
|
return;
|
|
}
|
|
|
|
try {
|
|
this._newData = JSON.parse(cleartext);
|
|
} catch (ex) {
|
|
this._log.error("Invalid data data: " + JSON.stringify(cleartext));
|
|
this.abort(JPAKE_ERROR_INVALID);
|
|
return;
|
|
}
|
|
|
|
this._log.trace("Decrypted data.");
|
|
callback();
|
|
},
|
|
|
|
_complete: function _complete() {
|
|
this._log.debug("Exchange completed.");
|
|
this._finished = true;
|
|
Utils.delay(function () { this.observer.onComplete(this._newData); },
|
|
0, this, "_timer_onComplete");
|
|
}
|
|
|
|
};
|