mirror of
https://github.com/classilla/tenfourfox.git
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455 lines
15 KiB
JavaScript
455 lines
15 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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this.EXPORTED_SYMBOLS = ["FxAccountsClient"];
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const {classes: Cc, interfaces: Ci, utils: Cu} = Components;
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Cu.import("resource://gre/modules/Log.jsm");
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Cu.import("resource://gre/modules/Promise.jsm");
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Cu.import("resource://gre/modules/Services.jsm");
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Cu.import("resource://services-common/utils.js");
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Cu.import("resource://services-common/hawkclient.js");
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Cu.import("resource://services-common/hawkrequest.js");
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Cu.import("resource://services-crypto/utils.js");
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Cu.import("resource://gre/modules/FxAccountsCommon.js");
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Cu.import("resource://gre/modules/Credentials.jsm");
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const HOST = Services.prefs.getCharPref("identity.fxaccounts.auth.uri");
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const STATUS_CODE_TO_OTHER_ERRORS_LABEL = {
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400: 0,
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401: 1,
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403: 2,
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410: 3,
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411: 4,
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413: 5,
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429: 6,
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500: 7,
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};
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const SIGNIN = "/account/login";
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const SIGNUP = "/account/create";
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this.FxAccountsClient = function(host = HOST) {
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this.host = host;
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// The FxA auth server expects requests to certain endpoints to be authorized
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// using Hawk.
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this.hawk = new HawkClient(host);
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this.hawk.observerPrefix = "FxA:hawk";
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// Manage server backoff state. C.f.
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// https://github.com/mozilla/fxa-auth-server/blob/master/docs/api.md#backoff-protocol
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this.backoffError = null;
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};
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this.FxAccountsClient.prototype = {
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/**
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* Return client clock offset, in milliseconds, as determined by hawk client.
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* Provided because callers should not have to know about hawk
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* implementation.
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*
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* The offset is the number of milliseconds that must be added to the client
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* clock to make it equal to the server clock. For example, if the client is
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* five minutes ahead of the server, the localtimeOffsetMsec will be -300000.
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*/
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get localtimeOffsetMsec() {
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return this.hawk.localtimeOffsetMsec;
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},
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/*
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* Return current time in milliseconds
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*
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* Not used by this module, but made available to the FxAccounts.jsm
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* that uses this client.
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*/
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now: function() {
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return this.hawk.now();
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},
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/**
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* Common code from signIn and signUp.
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*
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* @param path
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* Request URL path. Can be /account/create or /account/login
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* @param email
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* The email address for the account (utf8)
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* @param password
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* The user's password
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* @param [getKeys=false]
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* If set to true the keyFetchToken will be retrieved
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* @param [retryOK=true]
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* If capitalization of the email is wrong and retryOK is set to true,
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* we will retry with the suggested capitalization from the server
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* @return Promise
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* Returns a promise that resolves to an object:
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* {
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* authAt: authentication time for the session (seconds since epoch)
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* email: the primary email for this account
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* keyFetchToken: a key fetch token (hex)
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* sessionToken: a session token (hex)
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* uid: the user's unique ID (hex)
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* unwrapBKey: used to unwrap kB, derived locally from the
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* password (not revealed to the FxA server)
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* verified (optional): flag indicating verification status of the
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* email
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* }
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*/
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_createSession: function(path, email, password, getKeys=false,
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retryOK=true) {
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return Credentials.setup(email, password).then((creds) => {
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let data = {
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authPW: CommonUtils.bytesAsHex(creds.authPW),
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email: creds.emailUTF8,
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};
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let keys = getKeys ? "?keys=true" : "";
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return this._request(path + keys, "POST", null, data).then(
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// Include the canonical capitalization of the email in the response so
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// the caller can set its signed-in user state accordingly.
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result => {
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result.email = data.email;
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result.unwrapBKey = CommonUtils.bytesAsHex(creds.unwrapBKey);
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return result;
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},
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error => {
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log.debug("Session creation failed", error);
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// If the user entered an email with different capitalization from
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// what's stored in the database (e.g., Greta.Garbo@gmail.COM as
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// opposed to greta.garbo@gmail.com), the server will respond with a
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// errno 120 (code 400) and the expected capitalization of the email.
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// We retry with this email exactly once. If successful, we use the
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// server's version of the email as the signed-in-user's email. This
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// is necessary because the email also serves as salt; so we must be
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// in agreement with the server on capitalization.
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//
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// API reference:
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// https://github.com/mozilla/fxa-auth-server/blob/master/docs/api.md
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if (ERRNO_INCORRECT_EMAIL_CASE === error.errno && retryOK) {
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if (!error.email) {
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log.error("Server returned errno 120 but did not provide email");
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throw error;
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}
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return this._createSession(path, error.email, password, getKeys,
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false);
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}
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throw error;
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}
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);
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});
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},
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/**
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* Create a new Firefox Account and authenticate
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*
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* @param email
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* The email address for the account (utf8)
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* @param password
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* The user's password
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* @param [getKeys=false]
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* If set to true the keyFetchToken will be retrieved
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* @return Promise
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* Returns a promise that resolves to an object:
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* {
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* uid: the user's unique ID (hex)
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* sessionToken: a session token (hex)
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* keyFetchToken: a key fetch token (hex),
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* unwrapBKey: used to unwrap kB, derived locally from the
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* password (not revealed to the FxA server)
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* }
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*/
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signUp: function(email, password, getKeys=false) {
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return this._createSession(SIGNUP, email, password, getKeys,
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false /* no retry */);
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},
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/**
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* Authenticate and create a new session with the Firefox Account API server
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*
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* @param email
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* The email address for the account (utf8)
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* @param password
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* The user's password
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* @param [getKeys=false]
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* If set to true the keyFetchToken will be retrieved
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* @return Promise
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* Returns a promise that resolves to an object:
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* {
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* authAt: authentication time for the session (seconds since epoch)
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* email: the primary email for this account
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* keyFetchToken: a key fetch token (hex)
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* sessionToken: a session token (hex)
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* uid: the user's unique ID (hex)
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* unwrapBKey: used to unwrap kB, derived locally from the
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* password (not revealed to the FxA server)
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* verified: flag indicating verification status of the email
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* }
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*/
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signIn: function signIn(email, password, getKeys=false) {
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return this._createSession(SIGNIN, email, password, getKeys,
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true /* retry */);
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},
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/**
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* Destroy the current session with the Firefox Account API server
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*
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* @param sessionTokenHex
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* The session token encoded in hex
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* @return Promise
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*/
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signOut: function (sessionTokenHex, options = {}) {
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let path = "/session/destroy";
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if (options.service) {
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path += "?service=" + options.service;
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}
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return this._request(path, "POST",
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deriveHawkCredentials(sessionTokenHex, "sessionToken"));
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},
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/**
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* Check the verification status of the user's FxA email address
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*
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* @param sessionTokenHex
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* The current session token encoded in hex
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* @return Promise
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*/
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recoveryEmailStatus: function (sessionTokenHex) {
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return this._request("/recovery_email/status", "GET",
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deriveHawkCredentials(sessionTokenHex, "sessionToken"));
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},
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/**
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* Resend the verification email for the user
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*
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* @param sessionTokenHex
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* The current token encoded in hex
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* @return Promise
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*/
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resendVerificationEmail: function(sessionTokenHex) {
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return this._request("/recovery_email/resend_code", "POST",
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deriveHawkCredentials(sessionTokenHex, "sessionToken"));
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},
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/**
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* Retrieve encryption keys
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*
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* @param keyFetchTokenHex
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* A one-time use key fetch token encoded in hex
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* @return Promise
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* Returns a promise that resolves to an object:
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* {
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* kA: an encryption key for recevorable data (bytes)
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* wrapKB: an encryption key that requires knowledge of the
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* user's password (bytes)
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* }
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*/
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accountKeys: function (keyFetchTokenHex) {
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let creds = deriveHawkCredentials(keyFetchTokenHex, "keyFetchToken");
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let keyRequestKey = creds.extra.slice(0, 32);
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let morecreds = CryptoUtils.hkdf(keyRequestKey, undefined,
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Credentials.keyWord("account/keys"), 3 * 32);
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let respHMACKey = morecreds.slice(0, 32);
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let respXORKey = morecreds.slice(32, 96);
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return this._request("/account/keys", "GET", creds).then(resp => {
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if (!resp.bundle) {
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throw new Error("failed to retrieve keys");
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}
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let bundle = CommonUtils.hexToBytes(resp.bundle);
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let mac = bundle.slice(-32);
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let hasher = CryptoUtils.makeHMACHasher(Ci.nsICryptoHMAC.SHA256,
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CryptoUtils.makeHMACKey(respHMACKey));
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let bundleMAC = CryptoUtils.digestBytes(bundle.slice(0, -32), hasher);
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if (mac !== bundleMAC) {
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throw new Error("error unbundling encryption keys");
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}
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let keyAWrapB = CryptoUtils.xor(respXORKey, bundle.slice(0, 64));
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return {
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kA: keyAWrapB.slice(0, 32),
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wrapKB: keyAWrapB.slice(32)
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};
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});
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},
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/**
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* Sends a public key to the FxA API server and returns a signed certificate
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*
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* @param sessionTokenHex
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* The current session token encoded in hex
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* @param serializedPublicKey
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* A public key (usually generated by jwcrypto)
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* @param lifetime
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* The lifetime of the certificate
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* @return Promise
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* Returns a promise that resolves to the signed certificate.
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* The certificate can be used to generate a Persona assertion.
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* @throws a new Error
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* wrapping any of these HTTP code/errno pairs:
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* https://github.com/mozilla/fxa-auth-server/blob/master/docs/api.md#response-12
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*/
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signCertificate: function (sessionTokenHex, serializedPublicKey, lifetime) {
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let creds = deriveHawkCredentials(sessionTokenHex, "sessionToken");
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let body = { publicKey: serializedPublicKey,
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duration: lifetime };
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return Promise.resolve()
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.then(_ => this._request("/certificate/sign", "POST", creds, body))
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.then(resp => resp.cert,
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err => {
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log.error("HAWK.signCertificate error: " + JSON.stringify(err));
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throw err;
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});
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},
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/**
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* Determine if an account exists
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*
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* @param email
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* The email address to check
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* @return Promise
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* The promise resolves to true if the account exists, or false
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* if it doesn't. The promise is rejected on other errors.
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*/
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accountExists: function (email) {
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return this.signIn(email, "").then(
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(cantHappen) => {
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throw new Error("How did I sign in with an empty password?");
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},
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(expectedError) => {
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switch (expectedError.errno) {
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case ERRNO_ACCOUNT_DOES_NOT_EXIST:
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return false;
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break;
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case ERRNO_INCORRECT_PASSWORD:
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return true;
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break;
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default:
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// not so expected, any more ...
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throw expectedError;
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break;
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}
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}
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);
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},
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/**
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* Given the uid of an existing account (not an arbitrary email), ask
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* the server if it still exists via /account/status.
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*
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* Used for differentiating between password change and account deletion.
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*/
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accountStatus: function(uid) {
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return this._request("/account/status?uid="+uid, "GET").then(
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(result) => {
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return result.exists;
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},
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(error) => {
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log.error("accountStatus failed with: " + error);
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return Promise.reject(error);
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}
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);
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},
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_clearBackoff: function() {
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this.backoffError = null;
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},
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/**
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* A general method for sending raw API calls to the FxA auth server.
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* All request bodies and responses are JSON.
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*
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* @param path
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* API endpoint path
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* @param method
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* The HTTP request method
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* @param credentials
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* Hawk credentials
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* @param jsonPayload
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* A JSON payload
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* @return Promise
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* Returns a promise that resolves to the JSON response of the API call,
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* or is rejected with an error. Error responses have the following properties:
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* {
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* "code": 400, // matches the HTTP status code
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* "errno": 107, // stable application-level error number
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* "error": "Bad Request", // string description of the error type
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* "message": "the value of salt is not allowed to be undefined",
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* "info": "https://docs.dev.lcip.og/errors/1234" // link to more info on the error
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* }
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*/
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_request: function hawkRequest(path, method, credentials, jsonPayload) {
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let deferred = Promise.defer();
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// We were asked to back off.
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if (this.backoffError) {
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log.debug("Received new request during backoff, re-rejecting.");
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deferred.reject(this.backoffError);
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return deferred.promise;
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}
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this.hawk.request(path, method, credentials, jsonPayload).then(
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(response) => {
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try {
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let responseObj = JSON.parse(response.body);
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deferred.resolve(responseObj);
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} catch (err) {
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log.error("json parse error on response: " + response.body);
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deferred.reject({error: err});
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}
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},
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(error) => {
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log.error("error " + method + "ing " + path + ": " + JSON.stringify(error));
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if (error.retryAfter) {
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log.debug("Received backoff response; caching error as flag.");
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this.backoffError = error;
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// Schedule clearing of cached-error-as-flag.
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CommonUtils.namedTimer(
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this._clearBackoff,
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error.retryAfter * 1000,
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this,
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"fxaBackoffTimer"
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);
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}
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if (error.errno == ERRNO_UNVERIFIED_ACCOUNT) {
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Services.telemetry.getKeyedHistogramById(
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"FXA_UNVERIFIED_ACCOUNT_ERRORS").add(path);
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} else if (isInvalidTokenError(error)) {
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Services.telemetry.getKeyedHistogramById(
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"FXA_HAWK_ERRORS").add(path);
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} else if (error.code >= 500 || error.code in STATUS_CODE_TO_OTHER_ERRORS_LABEL) {
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let label = STATUS_CODE_TO_OTHER_ERRORS_LABEL[
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error.code >= 500 ? 500 : error.code];
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Services.telemetry.getKeyedHistogramById(
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"FXA_SERVER_ERRORS").add(path, label);
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}
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deferred.reject(error);
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}
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);
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return deferred.promise;
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},
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};
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function isInvalidTokenError(error) {
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if (error.code != 401) {
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return false;
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}
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switch (error.errno) {
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case ERRNO_INVALID_AUTH_TOKEN:
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case ERRNO_INVALID_AUTH_TIMESTAMP:
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case ERRNO_INVALID_AUTH_NONCE:
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return true;
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}
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return false;
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}
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