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Diffstat (limited to 'services/sync/modules/service.js')
| -rw-r--r-- | services/sync/modules/service.js | 1646 |
1 files changed, 1646 insertions, 0 deletions
diff --git a/services/sync/modules/service.js b/services/sync/modules/service.js new file mode 100644 index 0000000000..2def38a946 --- /dev/null +++ b/services/sync/modules/service.js @@ -0,0 +1,1646 @@ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +var EXPORTED_SYMBOLS = ["Service"]; + +// How long before refreshing the cluster +const CLUSTER_BACKOFF = 5 * 60 * 1000; // 5 minutes + +// How long a key to generate from an old passphrase. +const PBKDF2_KEY_BYTES = 16; + +const CRYPTO_COLLECTION = "crypto"; +const KEYS_WBO = "keys"; + +const { XPCOMUtils } = ChromeUtils.import( + "resource://gre/modules/XPCOMUtils.jsm" +); +const { Services } = ChromeUtils.import("resource://gre/modules/Services.jsm"); +const { Log } = ChromeUtils.import("resource://gre/modules/Log.jsm"); +const { Async } = ChromeUtils.import("resource://services-common/async.js"); +const { CommonUtils } = ChromeUtils.import( + "resource://services-common/utils.js" +); +const { + CLIENT_NOT_CONFIGURED, + CREDENTIALS_CHANGED, + HMAC_EVENT_INTERVAL, + LOGIN_FAILED, + LOGIN_FAILED_INVALID_PASSPHRASE, + LOGIN_FAILED_NETWORK_ERROR, + LOGIN_FAILED_NO_PASSPHRASE, + LOGIN_FAILED_NO_USERNAME, + LOGIN_FAILED_SERVER_ERROR, + LOGIN_SUCCEEDED, + MASTER_PASSWORD_LOCKED, + METARECORD_DOWNLOAD_FAIL, + NO_SYNC_NODE_FOUND, + PREFS_BRANCH, + STATUS_DISABLED, + STATUS_OK, + STORAGE_VERSION, + VERSION_OUT_OF_DATE, + WEAVE_VERSION, + kFirefoxShuttingDown, + kFirstSyncChoiceNotMade, + kSyncBackoffNotMet, + kSyncMasterPasswordLocked, + kSyncNetworkOffline, + kSyncNotConfigured, + kSyncWeaveDisabled, +} = ChromeUtils.import("resource://services-sync/constants.js"); +const { EngineManager } = ChromeUtils.import( + "resource://services-sync/engines.js" +); +const { ClientEngine } = ChromeUtils.import( + "resource://services-sync/engines/clients.js" +); +const { Weave } = ChromeUtils.import("resource://services-sync/main.js"); +const { ErrorHandler, SyncScheduler } = ChromeUtils.import( + "resource://services-sync/policies.js" +); +const { + CollectionKeyManager, + CryptoWrapper, + RecordManager, + WBORecord, +} = ChromeUtils.import("resource://services-sync/record.js"); +const { Resource } = ChromeUtils.import("resource://services-sync/resource.js"); +const { EngineSynchronizer } = ChromeUtils.import( + "resource://services-sync/stages/enginesync.js" +); +const { DeclinedEngines } = ChromeUtils.import( + "resource://services-sync/stages/declined.js" +); +const { Status } = ChromeUtils.import("resource://services-sync/status.js"); +ChromeUtils.import("resource://services-sync/telemetry.js"); +const { Svc, Utils } = ChromeUtils.import("resource://services-sync/util.js"); +const { fxAccounts } = ChromeUtils.import( + "resource://gre/modules/FxAccounts.jsm" +); + +function getEngineModules() { + let result = { + Addons: { module: "addons.js", symbol: "AddonsEngine" }, + Bookmarks: { module: "bookmarks.js", symbol: "BookmarksEngine" }, + Form: { module: "forms.js", symbol: "FormEngine" }, + History: { module: "history.js", symbol: "HistoryEngine" }, + Password: { module: "passwords.js", symbol: "PasswordEngine" }, + Prefs: { module: "prefs.js", symbol: "PrefsEngine" }, + Tab: { module: "tabs.js", symbol: "TabEngine" }, + }; + if (Svc.Prefs.get("engine.addresses.available", false)) { + result.Addresses = { + module: "resource://formautofill/FormAutofillSync.jsm", + symbol: "AddressesEngine", + }; + } + if (Svc.Prefs.get("engine.creditcards.available", false)) { + result.CreditCards = { + module: "resource://formautofill/FormAutofillSync.jsm", + symbol: "CreditCardsEngine", + }; + } + result["Extension-Storage"] = { + module: "extension-storage.js", + controllingPref: "webextensions.storage.sync.kinto", + whenTrue: "ExtensionStorageEngineKinto", + whenFalse: "ExtensionStorageEngineBridge", + }; + return result; +} + +// A unique identifier for this browser session. Used for logging so +// we can easily see whether 2 logs are in the same browser session or +// after the browser restarted. +XPCOMUtils.defineLazyGetter(this, "browserSessionID", Utils.makeGUID); + +function Sync11Service() { + this._notify = Utils.notify("weave:service:"); + Utils.defineLazyIDProperty(this, "syncID", "services.sync.client.syncID"); +} +Sync11Service.prototype = { + _lock: Utils.lock, + _locked: false, + _loggedIn: false, + + infoURL: null, + storageURL: null, + metaURL: null, + cryptoKeyURL: null, + // The cluster URL comes via the identity object, which in the FxA + // world is ebbedded in the token returned from the token server. + _clusterURL: null, + + get clusterURL() { + return this._clusterURL || ""; + }, + set clusterURL(value) { + if (value != null && typeof value != "string") { + throw new Error("cluster must be a string, got " + typeof value); + } + this._clusterURL = value; + this._updateCachedURLs(); + }, + + get isLoggedIn() { + return this._loggedIn; + }, + + get locked() { + return this._locked; + }, + lock: function lock() { + if (this._locked) { + return false; + } + this._locked = true; + return true; + }, + unlock: function unlock() { + this._locked = false; + }, + + // A specialized variant of Utils.catch. + // This provides a more informative error message when we're already syncing: + // see Bug 616568. + _catch(func) { + function lockExceptions(ex) { + if (Utils.isLockException(ex)) { + // This only happens if we're syncing already. + this._log.info("Cannot start sync: already syncing?"); + } + } + + return Utils.catch.call(this, func, lockExceptions); + }, + + get userBaseURL() { + // The user URL is the cluster URL. + return this.clusterURL; + }, + + _updateCachedURLs: function _updateCachedURLs() { + // Nothing to cache yet if we don't have the building blocks + if (!this.clusterURL) { + // Also reset all other URLs used by Sync to ensure we aren't accidentally + // using one cached earlier - if there's no cluster URL any cached ones + // are invalid. + this.infoURL = undefined; + this.storageURL = undefined; + this.metaURL = undefined; + this.cryptoKeysURL = undefined; + return; + } + + this._log.debug( + "Caching URLs under storage user base: " + this.userBaseURL + ); + + // Generate and cache various URLs under the storage API for this user + this.infoURL = this.userBaseURL + "info/collections"; + this.storageURL = this.userBaseURL + "storage/"; + this.metaURL = this.storageURL + "meta/global"; + this.cryptoKeysURL = this.storageURL + CRYPTO_COLLECTION + "/" + KEYS_WBO; + }, + + _checkCrypto: function _checkCrypto() { + let ok = false; + + try { + let iv = Weave.Crypto.generateRandomIV(); + if (iv.length == 24) { + ok = true; + } + } catch (e) { + this._log.debug("Crypto check failed: " + e); + } + + return ok; + }, + + /** + * Here is a disgusting yet reasonable way of handling HMAC errors deep in + * the guts of Sync. The astute reader will note that this is a hacky way of + * implementing something like continuable conditions. + * + * A handler function is glued to each engine. If the engine discovers an + * HMAC failure, we fetch keys from the server and update our keys, just as + * we would on startup. + * + * If our key collection changed, we signal to the engine (via our return + * value) that it should retry decryption. + * + * If our key collection did not change, it means that we already had the + * correct keys... and thus a different client has the wrong ones. Reupload + * the bundle that we fetched, which will bump the modified time on the + * server and (we hope) prompt a broken client to fix itself. + * + * We keep track of the time at which we last applied this reasoning, because + * thrashing doesn't solve anything. We keep a reasonable interval between + * these remedial actions. + */ + lastHMACEvent: 0, + + /* + * Returns whether to try again. + */ + async handleHMACEvent() { + let now = Date.now(); + + // Leave a sizable delay between HMAC recovery attempts. This gives us + // time for another client to fix themselves if we touch the record. + if (now - this.lastHMACEvent < HMAC_EVENT_INTERVAL) { + return false; + } + + this._log.info( + "Bad HMAC event detected. Attempting recovery " + + "or signaling to other clients." + ); + + // Set the last handled time so that we don't act again. + this.lastHMACEvent = now; + + // Fetch keys. + let cryptoKeys = new CryptoWrapper(CRYPTO_COLLECTION, KEYS_WBO); + try { + let cryptoResp = ( + await cryptoKeys.fetch(this.resource(this.cryptoKeysURL)) + ).response; + + // Save out the ciphertext for when we reupload. If there's a bug in + // CollectionKeyManager, this will prevent us from uploading junk. + let cipherText = cryptoKeys.ciphertext; + + if (!cryptoResp.success) { + this._log.warn("Failed to download keys."); + return false; + } + + let keysChanged = await this.handleFetchedKeys( + this.identity.syncKeyBundle, + cryptoKeys, + true + ); + if (keysChanged) { + // Did they change? If so, carry on. + this._log.info("Suggesting retry."); + return true; // Try again. + } + + // If not, reupload them and continue the current sync. + cryptoKeys.ciphertext = cipherText; + cryptoKeys.cleartext = null; + + let uploadResp = await this._uploadCryptoKeys( + cryptoKeys, + cryptoResp.obj.modified + ); + if (uploadResp.success) { + this._log.info("Successfully re-uploaded keys. Continuing sync."); + } else { + this._log.warn( + "Got error response re-uploading keys. " + + "Continuing sync; let's try again later." + ); + } + + return false; // Don't try again: same keys. + } catch (ex) { + this._log.warn( + "Got exception fetching and handling crypto keys. " + + "Will try again later.", + ex + ); + return false; + } + }, + + async handleFetchedKeys(syncKey, cryptoKeys, skipReset) { + // Don't want to wipe if we're just starting up! + let wasBlank = this.collectionKeys.isClear; + let keysChanged = await this.collectionKeys.updateContents( + syncKey, + cryptoKeys + ); + + if (keysChanged && !wasBlank) { + this._log.debug("Keys changed: " + JSON.stringify(keysChanged)); + + if (!skipReset) { + this._log.info("Resetting client to reflect key change."); + + if (keysChanged.length) { + // Collection keys only. Reset individual engines. + await this.resetClient(keysChanged); + } else { + // Default key changed: wipe it all. + await this.resetClient(); + } + + this._log.info("Downloaded new keys, client reset. Proceeding."); + } + return true; + } + return false; + }, + + /** + * Prepare to initialize the rest of Weave after waiting a little bit + */ + async onStartup() { + this.status = Status; + this.identity = Status._authManager; + this.collectionKeys = new CollectionKeyManager(); + + this.scheduler = new SyncScheduler(this); + this.errorHandler = new ErrorHandler(this); + + this._log = Log.repository.getLogger("Sync.Service"); + this._log.manageLevelFromPref("services.sync.log.logger.service.main"); + + this._log.info("Loading Weave " + WEAVE_VERSION); + + this.recordManager = new RecordManager(this); + + this.enabled = true; + + await this._registerEngines(); + + let ua = Cc["@mozilla.org/network/protocol;1?name=http"].getService( + Ci.nsIHttpProtocolHandler + ).userAgent; + this._log.info(ua); + + if (!this._checkCrypto()) { + this.enabled = false; + this._log.info( + "Could not load the Weave crypto component. Disabling " + + "Weave, since it will not work correctly." + ); + } + + Svc.Obs.add("weave:service:setup-complete", this); + Svc.Obs.add("sync:collection_changed", this); // Pulled from FxAccountsCommon + Svc.Obs.add("fxaccounts:device_disconnected", this); + Services.prefs.addObserver(PREFS_BRANCH + "engine.", this); + + if (!this.enabled) { + this._log.info("Firefox Sync disabled."); + } + + this._updateCachedURLs(); + + let status = this._checkSetup(); + if (status != STATUS_DISABLED && status != CLIENT_NOT_CONFIGURED) { + this._startTracking(); + } + + // Send an event now that Weave service is ready. We don't do this + // synchronously so that observers can import this module before + // registering an observer. + CommonUtils.nextTick(() => { + this.status.ready = true; + + // UI code uses the flag on the XPCOM service so it doesn't have + // to load a bunch of modules. + let xps = Cc["@mozilla.org/weave/service;1"].getService(Ci.nsISupports) + .wrappedJSObject; + xps.ready = true; + + Svc.Obs.notify("weave:service:ready"); + }); + }, + + _checkSetup: function _checkSetup() { + if (!this.enabled) { + return (this.status.service = STATUS_DISABLED); + } + return this.status.checkSetup(); + }, + + /** + * Register the built-in engines for certain applications + */ + async _registerEngines() { + this.engineManager = new EngineManager(this); + + let engineModules = getEngineModules(); + + let engines = []; + // We allow a pref, which has no default value, to limit the engines + // which are registered. We expect only tests will use this. + if (Svc.Prefs.has("registerEngines")) { + engines = Svc.Prefs.get("registerEngines").split(","); + this._log.info("Registering custom set of engines", engines); + } else { + // default is all engines. + engines = Object.keys(engineModules); + } + + let declined = []; + let pref = Svc.Prefs.get("declinedEngines"); + if (pref) { + declined = pref.split(","); + } + + let clientsEngine = new ClientEngine(this); + // Ideally clientsEngine should not exist + // (or be a promise that calls initialize() before returning the engine) + await clientsEngine.initialize(); + this.clientsEngine = clientsEngine; + + for (let name of engines) { + if (!(name in engineModules)) { + this._log.info("Do not know about engine: " + name); + continue; + } + let modInfo = engineModules[name]; + if (!modInfo.module.includes(":")) { + modInfo.module = "resource://services-sync/engines/" + modInfo.module; + } + let ns = {}; + try { + ChromeUtils.import(modInfo.module, ns); + if (modInfo.symbol) { + let symbol = modInfo.symbol; + if (!(symbol in ns)) { + this._log.warn( + "Could not find exported engine instance: " + symbol + ); + continue; + } + await this.engineManager.register(ns[symbol]); + } else { + let { whenTrue, whenFalse, controllingPref } = modInfo; + if (!(whenTrue in ns) || !(whenFalse in ns)) { + this._log.warn("Could not find all exported engine instances", { + whenTrue, + whenFalse, + }); + continue; + } + await this.engineManager.registerAlternatives( + name.toLowerCase(), + controllingPref, + ns[whenTrue], + ns[whenFalse] + ); + } + } catch (ex) { + this._log.warn("Could not register engine " + name, ex); + } + } + + this.engineManager.setDeclined(declined); + }, + + /** + * This method updates the local engines state from an existing meta/global + * when Sync is disabled. + * Running this code if sync is enabled would end up in very weird results + * (but we're nice and we check before doing anything!). + */ + async updateLocalEnginesState() { + await this.promiseInitialized; + + // Sanity check, this method is not meant to be run if Sync is enabled! + if (Svc.Prefs.get("username", "")) { + throw new Error("Sync is enabled!"); + } + + // For historical reasons the behaviour of setCluster() is bizarre, + // so just check what we care about - the meta URL. + if (!this.metaURL) { + await this.identity.setCluster(); + if (!this.metaURL) { + this._log.warn("Could not find a cluster."); + return; + } + } + // Clear the cache so we always fetch the latest meta/global. + this.recordManager.clearCache(); + let meta = await this.recordManager.get(this.metaURL); + if (!meta) { + this._log.info("Meta record is null, aborting engine state update."); + return; + } + const declinedEngines = meta.payload.declined; + const allEngines = this.engineManager.getAll().map(e => e.name); + // We don't want our observer of the enabled prefs to treat the change as + // a user-change, otherwise we will do the wrong thing with declined etc. + this._ignorePrefObserver = true; + try { + for (const engine of allEngines) { + Svc.Prefs.set(`engine.${engine}`, !declinedEngines.includes(engine)); + } + } finally { + this._ignorePrefObserver = false; + } + }, + + QueryInterface: ChromeUtils.generateQI([ + "nsIObserver", + "nsISupportsWeakReference", + ]), + + observe(subject, topic, data) { + switch (topic) { + // Ideally this observer should be in the SyncScheduler, but it would require + // some work to know about the sync specific engines. We should move this there once it does. + case "sync:collection_changed": + // We check if we're running TPS here to avoid TPS failing because it + // couldn't get to get the sync lock, due to us currently syncing the + // clients engine. + if (data.includes("clients") && !Svc.Prefs.get("testing.tps", false)) { + // Sync in the background (it's fine not to wait on the returned promise + // because sync() has a lock). + // [] = clients collection only + this.sync({ why: "collection_changed", engines: [] }).catch(e => { + this._log.error(e); + }); + } + break; + case "fxaccounts:device_disconnected": + data = JSON.parse(data); + if (!data.isLocalDevice) { + // Refresh the known stale clients list in the background. + this.clientsEngine.updateKnownStaleClients().catch(e => { + this._log.error(e); + }); + } + break; + case "weave:service:setup-complete": + let status = this._checkSetup(); + if (status != STATUS_DISABLED && status != CLIENT_NOT_CONFIGURED) { + this._startTracking(); + } + break; + case "nsPref:changed": + if (this._ignorePrefObserver) { + return; + } + const engine = data.slice((PREFS_BRANCH + "engine.").length); + if (engine.includes(".")) { + // A sub-preference of the engine was changed. For example + // `services.sync.engine.bookmarks.validation.percentageChance`. + return; + } + this._handleEngineStatusChanged(engine); + break; + } + }, + + _handleEngineStatusChanged(engine) { + this._log.trace("Status for " + engine + " engine changed."); + if (Svc.Prefs.get("engineStatusChanged." + engine, false)) { + // The enabled status being changed back to what it was before. + Svc.Prefs.reset("engineStatusChanged." + engine); + } else { + // Remember that the engine status changed locally until the next sync. + Svc.Prefs.set("engineStatusChanged." + engine, true); + } + }, + + _startTracking() { + const engines = [this.clientsEngine, ...this.engineManager.getAll()]; + for (let engine of engines) { + try { + engine.startTracking(); + } catch (e) { + this._log.error(`Could not start ${engine.name} engine tracker`, e); + } + } + // This is for TPS. We should try to do better. + Svc.Obs.notify("weave:service:tracking-started"); + }, + + async _stopTracking() { + const engines = [this.clientsEngine, ...this.engineManager.getAll()]; + for (let engine of engines) { + try { + await engine.stopTracking(); + } catch (e) { + this._log.error(`Could not stop ${engine.name} engine tracker`, e); + } + } + Svc.Obs.notify("weave:service:tracking-stopped"); + }, + + /** + * Obtain a Resource instance with authentication credentials. + */ + resource: function resource(url) { + let res = new Resource(url); + res.authenticator = this.identity.getResourceAuthenticator(); + + return res; + }, + + /** + * Perform the info fetch as part of a login or key fetch, or + * inside engine sync. + */ + async _fetchInfo(url) { + let infoURL = url || this.infoURL; + + this._log.trace("In _fetchInfo: " + infoURL); + let info; + try { + info = await this.resource(infoURL).get(); + } catch (ex) { + this.errorHandler.checkServerError(ex); + throw ex; + } + + // Always check for errors. + this.errorHandler.checkServerError(info); + if (!info.success) { + this._log.error("Aborting sync: failed to get collections."); + throw info; + } + return info; + }, + + async verifyAndFetchSymmetricKeys(infoResponse) { + this._log.debug( + "Fetching and verifying -- or generating -- symmetric keys." + ); + + let syncKeyBundle = this.identity.syncKeyBundle; + if (!syncKeyBundle) { + this.status.login = LOGIN_FAILED_NO_PASSPHRASE; + this.status.sync = CREDENTIALS_CHANGED; + return false; + } + + try { + if (!infoResponse) { + infoResponse = await this._fetchInfo(); // Will throw an exception on failure. + } + + // This only applies when the server is already at version 4. + if (infoResponse.status != 200) { + this._log.warn( + "info/collections returned non-200 response. Failing key fetch." + ); + this.status.login = LOGIN_FAILED_SERVER_ERROR; + this.errorHandler.checkServerError(infoResponse); + return false; + } + + let infoCollections = infoResponse.obj; + + this._log.info( + "Testing info/collections: " + JSON.stringify(infoCollections) + ); + + if (this.collectionKeys.updateNeeded(infoCollections)) { + this._log.info("collection keys reports that a key update is needed."); + + // Don't always set to CREDENTIALS_CHANGED -- we will probably take care of this. + + // Fetch storage/crypto/keys. + let cryptoKeys; + + if (infoCollections && CRYPTO_COLLECTION in infoCollections) { + try { + cryptoKeys = new CryptoWrapper(CRYPTO_COLLECTION, KEYS_WBO); + let cryptoResp = ( + await cryptoKeys.fetch(this.resource(this.cryptoKeysURL)) + ).response; + + if (cryptoResp.success) { + await this.handleFetchedKeys(syncKeyBundle, cryptoKeys); + return true; + } else if (cryptoResp.status == 404) { + // On failure, ask to generate new keys and upload them. + // Fall through to the behavior below. + this._log.warn( + "Got 404 for crypto/keys, but 'crypto' in info/collections. Regenerating." + ); + cryptoKeys = null; + } else { + // Some other problem. + this.status.login = LOGIN_FAILED_SERVER_ERROR; + this.errorHandler.checkServerError(cryptoResp); + this._log.warn( + "Got status " + cryptoResp.status + " fetching crypto keys." + ); + return false; + } + } catch (ex) { + this._log.warn("Got exception fetching cryptoKeys.", ex); + // TODO: Um, what exceptions might we get here? Should we re-throw any? + + // One kind of exception: HMAC failure. + if (Utils.isHMACMismatch(ex)) { + this.status.login = LOGIN_FAILED_INVALID_PASSPHRASE; + this.status.sync = CREDENTIALS_CHANGED; + } else { + // In the absence of further disambiguation or more precise + // failure constants, just report failure. + this.status.login = LOGIN_FAILED; + } + return false; + } + } else { + this._log.info( + "... 'crypto' is not a reported collection. Generating new keys." + ); + } + + if (!cryptoKeys) { + this._log.info("No keys! Generating new ones."); + + // Better make some and upload them, and wipe the server to ensure + // consistency. This is all achieved via _freshStart. + // If _freshStart fails to clear the server or upload keys, it will + // throw. + await this._freshStart(); + return true; + } + + // Last-ditch case. + return false; + } + // No update needed: we're good! + return true; + } catch (ex) { + // This means no keys are present, or there's a network error. + this._log.debug("Failed to fetch and verify keys", ex); + this.errorHandler.checkServerError(ex); + return false; + } + }, + + getMaxRecordPayloadSize() { + let config = this.serverConfiguration; + if (!config || !config.max_record_payload_bytes) { + this._log.warn( + "No config or incomplete config in getMaxRecordPayloadSize." + + " Are we running tests?" + ); + return 256 * 1024; + } + let payloadMax = config.max_record_payload_bytes; + if (config.max_post_bytes && payloadMax <= config.max_post_bytes) { + return config.max_post_bytes - 4096; + } + return payloadMax; + }, + + getMemcacheMaxRecordPayloadSize() { + // Collections stored in memcached ("tabs", "clients" or "meta") have a + // different max size than ones stored in the normal storage server db. + // In practice, the real limit here is 1M (bug 1300451 comment 40), but + // there's overhead involved that is hard to calculate on the client, so we + // use 512k to be safe (at the recommendation of the server team). Note + // that if the server reports a lower limit (via info/configuration), we + // respect that limit instead. See also bug 1403052. + return Math.min(512 * 1024, this.getMaxRecordPayloadSize()); + }, + + async verifyLogin(allow40XRecovery = true) { + // Attaching auth credentials to a request requires access to + // passwords, which means that Resource.get can throw MP-related + // exceptions! + // So we ask the identity to verify the login state after unlocking the + // master password (ie, this call is expected to prompt for MP unlock + // if necessary) while we still have control. + this.status.login = await this.identity.unlockAndVerifyAuthState(); + this._log.debug( + "Fetching unlocked auth state returned " + this.status.login + ); + if (this.status.login != STATUS_OK) { + return false; + } + + try { + // Make sure we have a cluster to verify against. + // This is a little weird, if we don't get a node we pretend + // to succeed, since that probably means we just don't have storage. + if (this.clusterURL == "" && !(await this.identity.setCluster())) { + this.status.sync = NO_SYNC_NODE_FOUND; + return true; + } + + // Fetch collection info on every startup. + let test = await this.resource(this.infoURL).get(); + + switch (test.status) { + case 200: + // The user is authenticated. + + // We have no way of verifying the passphrase right now, + // so wait until remoteSetup to do so. + // Just make the most trivial checks. + if (!this.identity.syncKeyBundle) { + this._log.warn("No passphrase in verifyLogin."); + this.status.login = LOGIN_FAILED_NO_PASSPHRASE; + return false; + } + + // Go ahead and do remote setup, so that we can determine + // conclusively that our passphrase is correct. + if (await this._remoteSetup(test)) { + // Username/password verified. + this.status.login = LOGIN_SUCCEEDED; + return true; + } + + this._log.warn("Remote setup failed."); + // Remote setup must have failed. + return false; + + case 401: + this._log.warn("401: login failed."); + // Fall through to the 404 case. + + case 404: + // Check that we're verifying with the correct cluster + if (allow40XRecovery && (await this.identity.setCluster())) { + return await this.verifyLogin(false); + } + + // We must have the right cluster, but the server doesn't expect us. + // For FxA this almost certainly means "transient error fetching token". + this.status.login = LOGIN_FAILED_NETWORK_ERROR; + return false; + + default: + // Server didn't respond with something that we expected + this.status.login = LOGIN_FAILED_SERVER_ERROR; + this.errorHandler.checkServerError(test); + return false; + } + } catch (ex) { + // Must have failed on some network issue + this._log.debug("verifyLogin failed", ex); + this.status.login = LOGIN_FAILED_NETWORK_ERROR; + this.errorHandler.checkServerError(ex); + return false; + } + }, + + async generateNewSymmetricKeys() { + this._log.info("Generating new keys WBO..."); + let wbo = await this.collectionKeys.generateNewKeysWBO(); + this._log.info("Encrypting new key bundle."); + await wbo.encrypt(this.identity.syncKeyBundle); + + let uploadRes = await this._uploadCryptoKeys(wbo, 0); + if (uploadRes.status != 200) { + this._log.warn( + "Got status " + + uploadRes.status + + " uploading new keys. What to do? Throw!" + ); + this.errorHandler.checkServerError(uploadRes); + throw new Error("Unable to upload symmetric keys."); + } + this._log.info("Got status " + uploadRes.status + " uploading keys."); + let serverModified = uploadRes.obj; // Modified timestamp according to server. + this._log.debug("Server reports crypto modified: " + serverModified); + + // Now verify that info/collections shows them! + this._log.debug("Verifying server collection records."); + let info = await this._fetchInfo(); + this._log.debug("info/collections is: " + info.data); + + if (info.status != 200) { + this._log.warn("Non-200 info/collections response. Aborting."); + throw new Error("Unable to upload symmetric keys."); + } + + info = info.obj; + if (!(CRYPTO_COLLECTION in info)) { + this._log.error( + "Consistency failure: info/collections excludes " + + "crypto after successful upload." + ); + throw new Error("Symmetric key upload failed."); + } + + // Can't check against local modified: clock drift. + if (info[CRYPTO_COLLECTION] < serverModified) { + this._log.error( + "Consistency failure: info/collections crypto entry " + + "is stale after successful upload." + ); + throw new Error("Symmetric key upload failed."); + } + + // Doesn't matter if the timestamp is ahead. + + // Download and install them. + let cryptoKeys = new CryptoWrapper(CRYPTO_COLLECTION, KEYS_WBO); + let cryptoResp = (await cryptoKeys.fetch(this.resource(this.cryptoKeysURL))) + .response; + if (cryptoResp.status != 200) { + this._log.warn("Failed to download keys."); + throw new Error("Symmetric key download failed."); + } + let keysChanged = await this.handleFetchedKeys( + this.identity.syncKeyBundle, + cryptoKeys, + true + ); + if (keysChanged) { + this._log.info("Downloaded keys differed, as expected."); + } + }, + + // configures/enabled/turns-on sync. There must be an FxA user signed in. + async configure() { + // We don't, and must not, throw if sync is already configured, because we + // might end up being called as part of a "reconnect" flow. We also want to + // avoid checking the FxA user is the same as the pref because the email + // address for the FxA account can change - we'd need to use the uid. + let user = await fxAccounts.getSignedInUser(); + if (!user) { + throw new Error("No FxA user is signed in"); + } + this._log.info("Configuring sync with current FxA user"); + Svc.Prefs.set("username", user.email); + Svc.Obs.notify("weave:connected"); + }, + + // resets/turns-off sync. + async startOver() { + this._log.trace("Invoking Service.startOver."); + await this._stopTracking(); + this.status.resetSync(); + + // Deletion doesn't make sense if we aren't set up yet! + if (this.clusterURL != "") { + // Clear client-specific data from the server, including disabled engines. + const engines = [this.clientsEngine, ...this.engineManager.getAll()]; + for (let engine of engines) { + try { + await engine.removeClientData(); + } catch (ex) { + this._log.warn(`Deleting client data for ${engine.name} failed`, ex); + } + } + this._log.debug("Finished deleting client data."); + } else { + this._log.debug("Skipping client data removal: no cluster URL."); + } + + this.identity.resetCredentials(); + this.status.login = LOGIN_FAILED_NO_USERNAME; + this.logout(); + Svc.Obs.notify("weave:service:start-over"); + + // Reset all engines and clear keys. + await this.resetClient(); + this.collectionKeys.clear(); + this.status.resetBackoff(); + + // Reset Weave prefs. + this._ignorePrefObserver = true; + Svc.Prefs.resetBranch(""); + this._ignorePrefObserver = false; + this.clusterURL = null; + + Svc.Prefs.set("lastversion", WEAVE_VERSION); + + try { + this.identity.finalize(); + this.status.__authManager = null; + this.identity = Status._authManager; + Svc.Obs.notify("weave:service:start-over:finish"); + } catch (err) { + this._log.error( + "startOver failed to re-initialize the identity manager", + err + ); + // Still send the observer notification so the current state is + // reflected in the UI. + Svc.Obs.notify("weave:service:start-over:finish"); + } + }, + + async login() { + async function onNotify() { + this._loggedIn = false; + if (this.scheduler.offline) { + this.status.login = LOGIN_FAILED_NETWORK_ERROR; + throw new Error("Application is offline, login should not be called"); + } + + this._log.info("User logged in successfully - verifying login."); + if (!(await this.verifyLogin())) { + // verifyLogin sets the failure states here. + throw new Error(`Login failed: ${this.status.login}`); + } + + this._updateCachedURLs(); + + this._loggedIn = true; + + return true; + } + + let notifier = this._notify("login", "", onNotify.bind(this)); + return this._catch(this._lock("service.js: login", notifier))(); + }, + + logout: function logout() { + // If we failed during login, we aren't going to have this._loggedIn set, + // but we still want to ask the identity to logout, so it doesn't try and + // reuse any old credentials next time we sync. + this._log.info("Logging out"); + this.identity.logout(); + this._loggedIn = false; + + Svc.Obs.notify("weave:service:logout:finish"); + }, + + // Note: returns false if we failed for a reason other than the server not yet + // supporting the api. + async _fetchServerConfiguration() { + // This is similar to _fetchInfo, but with different error handling. + + let infoURL = this.userBaseURL + "info/configuration"; + this._log.debug("Fetching server configuration", infoURL); + let configResponse; + try { + configResponse = await this.resource(infoURL).get(); + } catch (ex) { + // This is probably a network or similar error. + this._log.warn("Failed to fetch info/configuration", ex); + this.errorHandler.checkServerError(ex); + return false; + } + + if (configResponse.status == 404) { + // This server doesn't support the URL yet - that's OK. + this._log.debug( + "info/configuration returned 404 - using default upload semantics" + ); + } else if (configResponse.status != 200) { + this._log.warn( + `info/configuration returned ${configResponse.status} - using default configuration` + ); + this.errorHandler.checkServerError(configResponse); + return false; + } else { + this.serverConfiguration = configResponse.obj; + } + this._log.trace( + "info/configuration for this server", + this.serverConfiguration + ); + return true; + }, + + // Stuff we need to do after login, before we can really do + // anything (e.g. key setup). + async _remoteSetup(infoResponse, fetchConfig = true) { + if (fetchConfig && !(await this._fetchServerConfiguration())) { + return false; + } + + this._log.debug("Fetching global metadata record"); + let meta = await this.recordManager.get(this.metaURL); + + // Checking modified time of the meta record. + if ( + infoResponse && + infoResponse.obj.meta != this.metaModified && + (!meta || !meta.isNew) + ) { + // Delete the cached meta record... + this._log.debug( + "Clearing cached meta record. metaModified is " + + JSON.stringify(this.metaModified) + + ", setting to " + + JSON.stringify(infoResponse.obj.meta) + ); + + this.recordManager.del(this.metaURL); + + // ... fetch the current record from the server, and COPY THE FLAGS. + let newMeta = await this.recordManager.get(this.metaURL); + + // If we got a 401, we do not want to create a new meta/global - we + // should be able to get the existing meta after we get a new node. + if (this.recordManager.response.status == 401) { + this._log.debug( + "Fetching meta/global record on the server returned 401." + ); + this.errorHandler.checkServerError(this.recordManager.response); + return false; + } + + if (this.recordManager.response.status == 404) { + this._log.debug("No meta/global record on the server. Creating one."); + try { + await this._uploadNewMetaGlobal(); + } catch (uploadRes) { + this._log.warn( + "Unable to upload new meta/global. Failing remote setup." + ); + this.errorHandler.checkServerError(uploadRes); + return false; + } + } else if (!newMeta) { + this._log.warn("Unable to get meta/global. Failing remote setup."); + this.errorHandler.checkServerError(this.recordManager.response); + return false; + } else { + // If newMeta, then it stands to reason that meta != null. + newMeta.isNew = meta.isNew; + newMeta.changed = meta.changed; + } + + // Switch in the new meta object and record the new time. + meta = newMeta; + this.metaModified = infoResponse.obj.meta; + } + + let remoteVersion = + meta && meta.payload.storageVersion ? meta.payload.storageVersion : ""; + + this._log.debug( + [ + "Weave Version:", + WEAVE_VERSION, + "Local Storage:", + STORAGE_VERSION, + "Remote Storage:", + remoteVersion, + ].join(" ") + ); + + // Check for cases that require a fresh start. When comparing remoteVersion, + // we need to convert it to a number as older clients used it as a string. + if ( + !meta || + !meta.payload.storageVersion || + !meta.payload.syncID || + STORAGE_VERSION > parseFloat(remoteVersion) + ) { + this._log.info( + "One of: no meta, no meta storageVersion, or no meta syncID. Fresh start needed." + ); + + // abort the server wipe if the GET status was anything other than 404 or 200 + let status = this.recordManager.response.status; + if (status != 200 && status != 404) { + this.status.sync = METARECORD_DOWNLOAD_FAIL; + this.errorHandler.checkServerError(this.recordManager.response); + this._log.warn( + "Unknown error while downloading metadata record. Aborting sync." + ); + return false; + } + + if (!meta) { + this._log.info("No metadata record, server wipe needed"); + } + if (meta && !meta.payload.syncID) { + this._log.warn("No sync id, server wipe needed"); + } + + this._log.info("Wiping server data"); + await this._freshStart(); + + if (status == 404) { + this._log.info( + "Metadata record not found, server was wiped to ensure " + + "consistency." + ); + } else { + // 200 + this._log.info("Wiped server; incompatible metadata: " + remoteVersion); + } + return true; + } else if (remoteVersion > STORAGE_VERSION) { + this.status.sync = VERSION_OUT_OF_DATE; + this._log.warn("Upgrade required to access newer storage version."); + return false; + } else if (meta.payload.syncID != this.syncID) { + this._log.info( + "Sync IDs differ. Local is " + + this.syncID + + ", remote is " + + meta.payload.syncID + ); + await this.resetClient(); + this.collectionKeys.clear(); + this.syncID = meta.payload.syncID; + this._log.debug("Clear cached values and take syncId: " + this.syncID); + + if (!(await this.verifyAndFetchSymmetricKeys(infoResponse))) { + this._log.warn("Failed to fetch symmetric keys. Failing remote setup."); + return false; + } + + // bug 545725 - re-verify creds and fail sanely + if (!(await this.verifyLogin())) { + this.status.sync = CREDENTIALS_CHANGED; + this._log.info( + "Credentials have changed, aborting sync and forcing re-login." + ); + return false; + } + + return true; + } + if (!(await this.verifyAndFetchSymmetricKeys(infoResponse))) { + this._log.warn("Failed to fetch symmetric keys. Failing remote setup."); + return false; + } + + return true; + }, + + /** + * Return whether we should attempt login at the start of a sync. + * + * Note that this function has strong ties to _checkSync: callers + * of this function should typically use _checkSync to verify that + * any necessary login took place. + */ + _shouldLogin: function _shouldLogin() { + return ( + this.enabled && + !this.scheduler.offline && + !this.isLoggedIn && + Async.isAppReady() + ); + }, + + /** + * Determine if a sync should run. + * + * @param ignore [optional] + * array of reasons to ignore when checking + * + * @return Reason for not syncing; not-truthy if sync should run + */ + _checkSync: function _checkSync(ignore) { + let reason = ""; + // Ideally we'd call _checkSetup() here but that has too many side-effects. + if (Status.service == CLIENT_NOT_CONFIGURED) { + reason = kSyncNotConfigured; + } else if (Status.service == STATUS_DISABLED || !this.enabled) { + reason = kSyncWeaveDisabled; + } else if (this.scheduler.offline) { + reason = kSyncNetworkOffline; + } else if (this.status.minimumNextSync > Date.now()) { + reason = kSyncBackoffNotMet; + } else if ( + this.status.login == MASTER_PASSWORD_LOCKED && + Utils.mpLocked() + ) { + reason = kSyncMasterPasswordLocked; + } else if (Svc.Prefs.get("firstSync") == "notReady") { + reason = kFirstSyncChoiceNotMade; + } else if (!Async.isAppReady()) { + reason = kFirefoxShuttingDown; + } + + if (ignore && ignore.includes(reason)) { + return ""; + } + + return reason; + }, + + async sync({ engines, why } = {}) { + let dateStr = Utils.formatTimestamp(new Date()); + this._log.debug("User-Agent: " + Utils.userAgent); + await this.promiseInitialized; + this._log.info( + `Starting sync at ${dateStr} in browser session ${browserSessionID}` + ); + return this._catch(async function() { + // Make sure we're logged in. + if (this._shouldLogin()) { + this._log.debug("In sync: should login."); + if (!(await this.login())) { + this._log.debug("Not syncing: login returned false."); + return; + } + } else { + this._log.trace("In sync: no need to login."); + } + await this._lockedSync(engines, why); + })(); + }, + + /** + * Sync up engines with the server. + */ + async _lockedSync(engineNamesToSync, why) { + return this._lock( + "service.js: sync", + this._notify("sync", JSON.stringify({ why }), async function onNotify() { + let histogram = Services.telemetry.getHistogramById( + "WEAVE_START_COUNT" + ); + histogram.add(1); + + let synchronizer = new EngineSynchronizer(this); + await synchronizer.sync(engineNamesToSync, why); // Might throw! + + histogram = Services.telemetry.getHistogramById( + "WEAVE_COMPLETE_SUCCESS_COUNT" + ); + histogram.add(1); + + // We successfully synchronized. + // Check if the identity wants to pre-fetch a migration sentinel from + // the server. + // If we have no clusterURL, we are probably doing a node reassignment + // so don't attempt to get it in that case. + if (this.clusterURL) { + this.identity.prefetchMigrationSentinel(this); + } + + // Now let's update our declined engines + await this._maybeUpdateDeclined(); + }) + )(); + }, + + /** + * Update the "declined" information in meta/global if necessary. + */ + async _maybeUpdateDeclined() { + // if Sync failed due to no node we will not have a meta URL, so can't + // update anything. + if (!this.metaURL) { + return; + } + let meta = await this.recordManager.get(this.metaURL); + if (!meta) { + this._log.warn("No meta/global; can't update declined state."); + return; + } + + let declinedEngines = new DeclinedEngines(this); + let didChange = declinedEngines.updateDeclined(meta, this.engineManager); + if (!didChange) { + this._log.info( + "No change to declined engines. Not reuploading meta/global." + ); + return; + } + + await this.uploadMetaGlobal(meta); + }, + + /** + * Upload a fresh meta/global record + * @throws the response object if the upload request was not a success + */ + async _uploadNewMetaGlobal() { + let meta = new WBORecord("meta", "global"); + meta.payload.syncID = this.syncID; + meta.payload.storageVersion = STORAGE_VERSION; + meta.payload.declined = this.engineManager.getDeclined(); + meta.modified = 0; + meta.isNew = true; + + await this.uploadMetaGlobal(meta); + }, + + /** + * Upload meta/global, throwing the response on failure + * @param {WBORecord} meta meta/global record + * @throws the response object if the request was not a success + */ + async uploadMetaGlobal(meta) { + this._log.debug("Uploading meta/global", meta); + let res = this.resource(this.metaURL); + res.setHeader("X-If-Unmodified-Since", meta.modified); + let response = await res.put(meta); + if (!response.success) { + throw response; + } + // From https://docs.services.mozilla.com/storage/apis-1.5.html: + // "Successful responses will return the new last-modified time for the collection." + meta.modified = response.obj; + this.recordManager.set(this.metaURL, meta); + }, + + /** + * Upload crypto/keys + * @param {WBORecord} cryptoKeys crypto/keys record + * @param {Number} lastModified known last modified timestamp (in decimal seconds), + * will be used to set the X-If-Unmodified-Since header + */ + async _uploadCryptoKeys(cryptoKeys, lastModified) { + this._log.debug(`Uploading crypto/keys (lastModified: ${lastModified})`); + let res = this.resource(this.cryptoKeysURL); + res.setHeader("X-If-Unmodified-Since", lastModified); + return res.put(cryptoKeys); + }, + + async _freshStart() { + this._log.info("Fresh start. Resetting client."); + await this.resetClient(); + this.collectionKeys.clear(); + + // Wipe the server. + await this.wipeServer(); + + // Upload a new meta/global record. + // _uploadNewMetaGlobal throws on failure -- including race conditions. + // If we got into a race condition, we'll abort the sync this way, too. + // That's fine. We'll just wait till the next sync. The client that we're + // racing is probably busy uploading stuff right now anyway. + await this._uploadNewMetaGlobal(); + + // Wipe everything we know about except meta because we just uploaded it + // TODO: there's a bug here. We should be calling resetClient, no? + + // Generate, upload, and download new keys. Do this last so we don't wipe + // them... + await this.generateNewSymmetricKeys(); + }, + + /** + * Wipe user data from the server. + * + * @param collections [optional] + * Array of collections to wipe. If not given, all collections are + * wiped by issuing a DELETE request for `storageURL`. + * + * @return the server's timestamp of the (last) DELETE. + */ + async wipeServer(collections) { + let response; + let histogram = Services.telemetry.getHistogramById( + "WEAVE_WIPE_SERVER_SUCCEEDED" + ); + if (!collections) { + // Strip the trailing slash. + let res = this.resource(this.storageURL.slice(0, -1)); + res.setHeader("X-Confirm-Delete", "1"); + try { + response = await res.delete(); + } catch (ex) { + this._log.debug("Failed to wipe server", ex); + histogram.add(false); + throw ex; + } + if (response.status != 200 && response.status != 404) { + this._log.debug( + "Aborting wipeServer. Server responded with " + + response.status + + " response for " + + this.storageURL + ); + histogram.add(false); + throw response; + } + histogram.add(true); + return response.headers["x-weave-timestamp"]; + } + + let timestamp; + for (let name of collections) { + let url = this.storageURL + name; + try { + response = await this.resource(url).delete(); + } catch (ex) { + this._log.debug("Failed to wipe '" + name + "' collection", ex); + histogram.add(false); + throw ex; + } + + if (response.status != 200 && response.status != 404) { + this._log.debug( + "Aborting wipeServer. Server responded with " + + response.status + + " response for " + + url + ); + histogram.add(false); + throw response; + } + + if ("x-weave-timestamp" in response.headers) { + timestamp = response.headers["x-weave-timestamp"]; + } + } + histogram.add(true); + return timestamp; + }, + + /** + * Wipe all local user data. + * + * @param engines [optional] + * Array of engine names to wipe. If not given, all engines are used. + */ + async wipeClient(engines) { + // If we don't have any engines, reset the service and wipe all engines + if (!engines) { + // Clear out any service data + await this.resetService(); + + engines = [this.clientsEngine, ...this.engineManager.getAll()]; + } else { + // Convert the array of names into engines + engines = this.engineManager.get(engines); + } + + // Fully wipe each engine if it's able to decrypt data + for (let engine of engines) { + if (await engine.canDecrypt()) { + await engine.wipeClient(); + } + } + }, + + /** + * Wipe all remote user data by wiping the server then telling each remote + * client to wipe itself. + * + * @param engines [optional] + * Array of engine names to wipe. If not given, all engines are used. + */ + async wipeRemote(engines) { + try { + // Make sure stuff gets uploaded. + await this.resetClient(engines); + + // Clear out any server data. + await this.wipeServer(engines); + + // Only wipe the engines provided. + let extra = { reason: "wipe-remote" }; + if (engines) { + for (const e of engines) { + await this.clientsEngine.sendCommand("wipeEngine", [e], null, extra); + } + } else { + // Tell the remote machines to wipe themselves. + await this.clientsEngine.sendCommand("wipeAll", [], null, extra); + } + + // Make sure the changed clients get updated. + await this.clientsEngine.sync(); + } catch (ex) { + this.errorHandler.checkServerError(ex); + throw ex; + } + }, + + /** + * Reset local service information like logs, sync times, caches. + */ + async resetService() { + return this._catch(async function reset() { + this._log.info("Service reset."); + + // Pretend we've never synced to the server and drop cached data + this.syncID = ""; + this.recordManager.clearCache(); + })(); + }, + + /** + * Reset the client by getting rid of any local server data and client data. + * + * @param engines [optional] + * Array of engine names to reset. If not given, all engines are used. + */ + async resetClient(engines) { + return this._catch(async function doResetClient() { + // If we don't have any engines, reset everything including the service + if (!engines) { + // Clear out any service data + await this.resetService(); + + engines = [this.clientsEngine, ...this.engineManager.getAll()]; + } else { + // Convert the array of names into engines + engines = this.engineManager.get(engines); + } + + // Have each engine drop any temporary meta data + for (let engine of engines) { + await engine.resetClient(); + } + })(); + }, + + recordTelemetryEvent(object, method, value, extra = undefined) { + Svc.Obs.notify("weave:telemetry:event", { object, method, value, extra }); + }, +}; + +var Service = new Sync11Service(); +this.Service.promiseInitialized = new Promise(resolve => { + this.Service.onStartup().then(resolve); +}); |