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+// -*- indent-tabs-mode: nil; js-indent-level: 2 -*-
+/* 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/. */
+
+Components.utils.import("resource://gre/modules/XPCOMUtils.jsm");
+Components.utils.import("resource://gre/modules/Services.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "PlacesUtils",
+ "resource://gre/modules/PlacesUtils.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "FormHistory",
+ "resource://gre/modules/FormHistory.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "Downloads",
+ "resource://gre/modules/Downloads.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "Promise",
+ "resource://gre/modules/Promise.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "Task",
+ "resource://gre/modules/Task.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "DownloadsCommon",
+ "resource:///modules/DownloadsCommon.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "TelemetryStopwatch",
+ "resource://gre/modules/TelemetryStopwatch.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "console",
+ "resource://gre/modules/Console.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "Preferences",
+ "resource://gre/modules/Preferences.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "setTimeout",
+ "resource://gre/modules/Timer.jsm");
+
+/**
+ * A number of iterations after which to yield time back
+ * to the system.
+ */
+const YIELD_PERIOD = 10;
+
+function Sanitizer() {
+}
+Sanitizer.prototype = {
+ // warning to the caller: this one may raise an exception (e.g. bug #265028)
+ clearItem(aItemName) {
+ this.items[aItemName].clear();
+ },
+
+ prefDomain: "",
+ isShutDown: false,
+
+ getNameFromPreference(aPreferenceName) {
+ return aPreferenceName.substr(this.prefDomain.length);
+ },
+
+ /**
+ * Deletes privacy sensitive data in a batch, according to user preferences.
+ * Returns a promise which is resolved if no errors occurred. If an error
+ * occurs, a message is reported to the console and all other items are still
+ * cleared before the promise is finally rejected.
+ *
+ * @param [optional] itemsToClear
+ * Array of items to be cleared. if specified only those
+ * items get cleared, irrespectively of the preference settings.
+ * @param [optional] options
+ * Object whose properties are options for this sanitization.
+ * TODO (bug 1167238) document options here.
+ */
+ sanitize: Task.async(function*(itemsToClear = null, options = {}) {
+ let progress = options.progress || {};
+ let promise = this._sanitize(itemsToClear, progress);
+
+ // Depending on preferences, the sanitizer may perform asynchronous
+ // work before it starts cleaning up the Places database (e.g. closing
+ // windows). We need to make sure that the connection to that database
+ // hasn't been closed by the time we use it.
+ // Though, if this is a sanitize on shutdown, we already have a blocker.
+ if (!progress.isShutdown) {
+ let shutdownClient = Cc["@mozilla.org/browser/nav-history-service;1"]
+ .getService(Ci.nsPIPlacesDatabase)
+ .shutdownClient
+ .jsclient;
+ shutdownClient.addBlocker("sanitize.js: Sanitize",
+ promise,
+ {
+ fetchState: () => ({ progress })
+ }
+ );
+ }
+
+ try {
+ yield promise;
+ } finally {
+ Services.obs.notifyObservers(null, "sanitizer-sanitization-complete", "");
+ }
+ }),
+
+ _sanitize: Task.async(function*(aItemsToClear, progress = {}) {
+ let seenError = false;
+ let itemsToClear;
+ if (Array.isArray(aItemsToClear)) {
+ // Shallow copy the array, as we are going to modify
+ // it in place later.
+ itemsToClear = [...aItemsToClear];
+ } else {
+ let branch = Services.prefs.getBranch(this.prefDomain);
+ itemsToClear = Object.keys(this.items).filter(itemName => {
+ try {
+ return branch.getBoolPref(itemName);
+ } catch (ex) {
+ return false;
+ }
+ });
+ }
+
+ // Store the list of items to clear, in case we are killed before we
+ // get a chance to complete.
+ Preferences.set(Sanitizer.PREF_SANITIZE_IN_PROGRESS,
+ JSON.stringify(itemsToClear));
+
+ // Store the list of items to clear, for debugging/forensics purposes
+ for (let k of itemsToClear) {
+ progress[k] = "ready";
+ }
+
+ // Ensure open windows get cleared first, if they're in our list, so that they don't stick
+ // around in the recently closed windows list, and so we can cancel the whole thing
+ // if the user selects to keep a window open from a beforeunload prompt.
+ let openWindowsIndex = itemsToClear.indexOf("openWindows");
+ if (openWindowsIndex != -1) {
+ itemsToClear.splice(openWindowsIndex, 1);
+ yield this.items.openWindows.clear();
+ progress.openWindows = "cleared";
+ }
+
+ // Cache the range of times to clear
+ let range = null;
+ // If we ignore timespan, clear everything,
+ // otherwise, pick a range.
+ if (!this.ignoreTimespan) {
+ range = this.range || Sanitizer.getClearRange();
+ }
+
+ // For performance reasons we start all the clear tasks at once, then wait
+ // for their promises later.
+ // Some of the clear() calls may raise exceptions (for example bug 265028),
+ // we catch and store them, but continue to sanitize as much as possible.
+ // Callers should check returned errors and give user feedback
+ // about items that could not be sanitized
+ let refObj = {};
+ TelemetryStopwatch.start("FX_SANITIZE_TOTAL", refObj);
+
+ let annotateError = (name, ex) => {
+ progress[name] = "failed";
+ seenError = true;
+ console.error("Error sanitizing " + name, ex);
+ };
+
+ // Array of objects in form { name, promise }.
+ // `name` is the item's name and `promise` may be a promise, if the
+ // sanitization is asynchronous, or the function return value, otherwise.
+ let handles = [];
+ for (let name of itemsToClear) {
+ let item = this.items[name];
+ item.isShutdown = this.isShutdown;
+ try {
+ // Catch errors here, so later we can just loop through these.
+ handles.push({ name,
+ promise: item.clear(range)
+ .then(() => progress[name] = "cleared",
+ ex => annotateError(name, ex))
+ });
+ } catch (ex) {
+ annotateError(name, ex);
+ }
+ }
+ for (let handle of handles) {
+ progress[handle.name] = "blocking";
+ yield handle.promise;
+ }
+
+ // Sanitization is complete.
+ TelemetryStopwatch.finish("FX_SANITIZE_TOTAL", refObj);
+ // Reset the inProgress preference since we were not killed during
+ // sanitization.
+ Preferences.reset(Sanitizer.PREF_SANITIZE_IN_PROGRESS);
+ progress = {};
+ if (seenError) {
+ throw new Error("Error sanitizing");
+ }
+ }),
+
+ // Time span only makes sense in certain cases. Consumers who want
+ // to only clear some private data can opt in by setting this to false,
+ // and can optionally specify a specific range. If timespan is not ignored,
+ // and range is not set, sanitize() will use the value of the timespan
+ // pref to determine a range
+ ignoreTimespan : true,
+ range : null,
+
+ items: {
+ cache: {
+ clear: Task.async(function* (range) {
+ let seenException;
+ let refObj = {};
+ TelemetryStopwatch.start("FX_SANITIZE_CACHE", refObj);
+
+ try {
+ // Cache doesn't consult timespan, nor does it have the
+ // facility for timespan-based eviction. Wipe it.
+ let cache = Cc["@mozilla.org/netwerk/cache-storage-service;1"]
+ .getService(Ci.nsICacheStorageService);
+ cache.clear();
+ } catch (ex) {
+ seenException = ex;
+ }
+
+ try {
+ let imageCache = Cc["@mozilla.org/image/tools;1"]
+ .getService(Ci.imgITools)
+ .getImgCacheForDocument(null);
+ imageCache.clearCache(false); // true=chrome, false=content
+ } catch (ex) {
+ seenException = ex;
+ }
+
+ TelemetryStopwatch.finish("FX_SANITIZE_CACHE", refObj);
+ if (seenException) {
+ throw seenException;
+ }
+ })
+ },
+
+ cookies: {
+ clear: Task.async(function* (range) {
+ let seenException;
+ let yieldCounter = 0;
+ let refObj = {};
+
+ // Clear cookies.
+ TelemetryStopwatch.start("FX_SANITIZE_COOKIES_2", refObj);
+ try {
+ let cookieMgr = Components.classes["@mozilla.org/cookiemanager;1"]
+ .getService(Ci.nsICookieManager);
+ if (range) {
+ // Iterate through the cookies and delete any created after our cutoff.
+ let cookiesEnum = cookieMgr.enumerator;
+ while (cookiesEnum.hasMoreElements()) {
+ let cookie = cookiesEnum.getNext().QueryInterface(Ci.nsICookie2);
+
+ if (cookie.creationTime > range[0]) {
+ // This cookie was created after our cutoff, clear it
+ cookieMgr.remove(cookie.host, cookie.name, cookie.path,
+ false, cookie.originAttributes);
+
+ if (++yieldCounter % YIELD_PERIOD == 0) {
+ yield new Promise(resolve => setTimeout(resolve, 0)); // Don't block the main thread too long
+ }
+ }
+ }
+ } else {
+ // Remove everything
+ cookieMgr.removeAll();
+ yield new Promise(resolve => setTimeout(resolve, 0)); // Don't block the main thread too long
+ }
+ } catch (ex) {
+ seenException = ex;
+ } finally {
+ TelemetryStopwatch.finish("FX_SANITIZE_COOKIES_2", refObj);
+ }
+
+ // Clear deviceIds. Done asynchronously (returns before complete).
+ try {
+ let mediaMgr = Components.classes["@mozilla.org/mediaManagerService;1"]
+ .getService(Ci.nsIMediaManagerService);
+ mediaMgr.sanitizeDeviceIds(range && range[0]);
+ } catch (ex) {
+ seenException = ex;
+ }
+
+ // Clear plugin data.
+ try {
+ yield Sanitizer.clearPluginData(range);
+ } catch (ex) {
+ seenException = ex;
+ }
+
+ if (seenException) {
+ throw seenException;
+ }
+ }),
+ },
+
+ offlineApps: {
+ clear: Task.async(function* (range) {
+ Components.utils.import("resource:///modules/offlineAppCache.jsm");
+ // This doesn't wait for the cleanup to be complete.
+ OfflineAppCacheHelper.clear();
+ if (!range || this.isShutDown) {
+ // Clear local storage entries
+ Components.utils.import("resource:///modules/QuotaManager.jsm");
+ QuotaManagerHelper.clear(this.isShutdown);
+ }
+ })
+ },
+
+ history: {
+ clear: Task.async(function* (range) {
+ let seenException;
+ let refObj = {};
+ TelemetryStopwatch.start("FX_SANITIZE_HISTORY", refObj);
+ try {
+ if (range) {
+ yield PlacesUtils.history.removeVisitsByFilter({
+ beginDate: new Date(range[0] / 1000),
+ endDate: new Date(range[1] / 1000)
+ });
+ } else {
+ // Remove everything.
+ yield PlacesUtils.history.clear();
+ }
+ } catch (ex) {
+ seenException = ex;
+ } finally {
+ TelemetryStopwatch.finish("FX_SANITIZE_HISTORY", refObj);
+ }
+
+ try {
+ let clearStartingTime = range ? String(range[0]) : "";
+ Services.obs.notifyObservers(null, "browser:purge-session-history", clearStartingTime);
+ } catch (ex) {
+ seenException = ex;
+ }
+
+ try {
+ let predictor = Components.classes["@mozilla.org/network/predictor;1"]
+ .getService(Components.interfaces.nsINetworkPredictor);
+ predictor.reset();
+ } catch (ex) {
+ seenException = ex;
+ }
+
+ if (seenException) {
+ throw seenException;
+ }
+ })
+ },
+
+ formdata: {
+ clear: Task.async(function* (range) {
+ let seenException;
+ let refObj = {};
+ TelemetryStopwatch.start("FX_SANITIZE_FORMDATA", refObj);
+ try {
+ // Clear undo history of all search bars.
+ let windows = Services.wm.getEnumerator("navigator:browser");
+ while (windows.hasMoreElements()) {
+ let currentWindow = windows.getNext();
+ let currentDocument = currentWindow.document;
+
+ // searchBar.textbox may not exist due to the search bar binding
+ // not having been constructed yet if the search bar is in the
+ // overflow or menu panel. It won't have a value or edit history in
+ // that case.
+ let searchBar = currentDocument.getElementById("searchbar");
+ if (searchBar && searchBar.textbox)
+ searchBar.textbox.reset();
+
+ let tabBrowser = currentWindow.gBrowser;
+ if (!tabBrowser) {
+ // No tab browser? This means that it's too early during startup (typically,
+ // Session Restore hasn't completed yet). Since we don't have find
+ // bars at that stage and since Session Restore will not restore
+ // find bars further down during startup, we have nothing to clear.
+ continue;
+ }
+ for (let tab of tabBrowser.tabs) {
+ if (tabBrowser.isFindBarInitialized(tab))
+ tabBrowser.getFindBar(tab).clear();
+ }
+ // Clear any saved find value
+ tabBrowser._lastFindValue = "";
+ }
+ } catch (ex) {
+ seenException = ex;
+ }
+
+ try {
+ let change = { op: "remove" };
+ if (range) {
+ [ change.firstUsedStart, change.firstUsedEnd ] = range;
+ }
+ yield new Promise(resolve => {
+ FormHistory.update(change, {
+ handleError(e) {
+ seenException = new Error("Error " + e.result + ": " + e.message);
+ },
+ handleCompletion() {
+ resolve();
+ }
+ });
+ });
+ } catch (ex) {
+ seenException = ex;
+ }
+
+ TelemetryStopwatch.finish("FX_SANITIZE_FORMDATA", refObj);
+ if (seenException) {
+ throw seenException;
+ }
+ })
+ },
+
+ downloads: {
+ clear: Task.async(function* (range) {
+ let refObj = {};
+ TelemetryStopwatch.start("FX_SANITIZE_DOWNLOADS", refObj);
+ try {
+ let filterByTime = null;
+ if (range) {
+ // Convert microseconds back to milliseconds for date comparisons.
+ let rangeBeginMs = range[0] / 1000;
+ let rangeEndMs = range[1] / 1000;
+ filterByTime = download => download.startTime >= rangeBeginMs &&
+ download.startTime <= rangeEndMs;
+ }
+
+ // Clear all completed/cancelled downloads
+ let list = yield Downloads.getList(Downloads.ALL);
+ list.removeFinished(filterByTime);
+ } finally {
+ TelemetryStopwatch.finish("FX_SANITIZE_DOWNLOADS", refObj);
+ }
+ })
+ },
+
+ sessions: {
+ clear: Task.async(function* (range) {
+ let refObj = {};
+ TelemetryStopwatch.start("FX_SANITIZE_SESSIONS", refObj);
+
+ try {
+ // clear all auth tokens
+ let sdr = Components.classes["@mozilla.org/security/sdr;1"]
+ .getService(Components.interfaces.nsISecretDecoderRing);
+ sdr.logoutAndTeardown();
+
+ // clear FTP and plain HTTP auth sessions
+ Services.obs.notifyObservers(null, "net:clear-active-logins", null);
+ } finally {
+ TelemetryStopwatch.finish("FX_SANITIZE_SESSIONS", refObj);
+ }
+ })
+ },
+
+ siteSettings: {
+ clear: Task.async(function* (range) {
+ let seenException;
+ let refObj = {};
+ TelemetryStopwatch.start("FX_SANITIZE_SITESETTINGS", refObj);
+
+ let startDateMS = range ? range[0] / 1000 : null;
+
+ try {
+ // Clear site-specific permissions like "Allow this site to open popups"
+ // we ignore the "end" range and hope it is now() - none of the
+ // interfaces used here support a true range anyway.
+ if (startDateMS == null) {
+ Services.perms.removeAll();
+ } else {
+ Services.perms.removeAllSince(startDateMS);
+ }
+ } catch (ex) {
+ seenException = ex;
+ }
+
+ try {
+ // Clear site-specific settings like page-zoom level
+ let cps = Components.classes["@mozilla.org/content-pref/service;1"]
+ .getService(Components.interfaces.nsIContentPrefService2);
+ if (startDateMS == null) {
+ cps.removeAllDomains(null);
+ } else {
+ cps.removeAllDomainsSince(startDateMS, null);
+ }
+ } catch (ex) {
+ seenException = ex;
+ }
+
+ try {
+ // Clear site security settings - no support for ranges in this
+ // interface either, so we clearAll().
+ let sss = Cc["@mozilla.org/ssservice;1"]
+ .getService(Ci.nsISiteSecurityService);
+ sss.clearAll();
+ } catch (ex) {
+ seenException = ex;
+ }
+
+ // Clear all push notification subscriptions
+ try {
+ yield new Promise((resolve, reject) => {
+ let push = Cc["@mozilla.org/push/Service;1"]
+ .getService(Ci.nsIPushService);
+ push.clearForDomain("*", status => {
+ if (Components.isSuccessCode(status)) {
+ resolve();
+ } else {
+ reject(new Error("Error clearing push subscriptions: " +
+ status));
+ }
+ });
+ });
+ } catch (ex) {
+ seenException = ex;
+ }
+
+ TelemetryStopwatch.finish("FX_SANITIZE_SITESETTINGS", refObj);
+ if (seenException) {
+ throw seenException;
+ }
+ })
+ },
+
+ openWindows: {
+ privateStateForNewWindow: "non-private",
+ _canCloseWindow(aWindow) {
+ if (aWindow.CanCloseWindow()) {
+ // We already showed PermitUnload for the window, so let's
+ // make sure we don't do it again when we actually close the
+ // window.
+ aWindow.skipNextCanClose = true;
+ return true;
+ }
+ return false;
+ },
+ _resetAllWindowClosures(aWindowList) {
+ for (let win of aWindowList) {
+ win.skipNextCanClose = false;
+ }
+ },
+ clear: Task.async(function* () {
+ // NB: this closes all *browser* windows, not other windows like the library, about window,
+ // browser console, etc.
+
+ // Keep track of the time in case we get stuck in la-la-land because of onbeforeunload
+ // dialogs
+ let existingWindow = Services.appShell.hiddenDOMWindow;
+ let startDate = existingWindow.performance.now();
+
+ // First check if all these windows are OK with being closed:
+ let windowEnumerator = Services.wm.getEnumerator("navigator:browser");
+ let windowList = [];
+ while (windowEnumerator.hasMoreElements()) {
+ let someWin = windowEnumerator.getNext();
+ windowList.push(someWin);
+ // If someone says "no" to a beforeunload prompt, we abort here:
+ if (!this._canCloseWindow(someWin)) {
+ this._resetAllWindowClosures(windowList);
+ throw new Error("Sanitize could not close windows: cancelled by user");
+ }
+
+ // ...however, beforeunload prompts spin the event loop, and so the code here won't get
+ // hit until the prompt has been dismissed. If more than 1 minute has elapsed since we
+ // started prompting, stop, because the user might not even remember initiating the
+ // 'forget', and the timespans will be all wrong by now anyway:
+ if (existingWindow.performance.now() > (startDate + 60 * 1000)) {
+ this._resetAllWindowClosures(windowList);
+ throw new Error("Sanitize could not close windows: timeout");
+ }
+ }
+
+ // If/once we get here, we should actually be able to close all windows.
+
+ let refObj = {};
+ TelemetryStopwatch.start("FX_SANITIZE_OPENWINDOWS", refObj);
+
+ // First create a new window. We do this first so that on non-mac, we don't
+ // accidentally close the app by closing all the windows.
+ let handler = Cc["@mozilla.org/browser/clh;1"].getService(Ci.nsIBrowserHandler);
+ let defaultArgs = handler.defaultArgs;
+ let features = "chrome,all,dialog=no," + this.privateStateForNewWindow;
+ let newWindow = existingWindow.openDialog("chrome://browser/content/", "_blank",
+ features, defaultArgs);
+
+ let onFullScreen = null;
+#ifdef XP_MACOSX
+ onFullScreen = function(e) {
+ newWindow.removeEventListener("fullscreen", onFullScreen);
+ let docEl = newWindow.document.documentElement;
+ let sizemode = docEl.getAttribute("sizemode");
+ if (!newWindow.fullScreen && sizemode == "fullscreen") {
+ docEl.setAttribute("sizemode", "normal");
+ e.preventDefault();
+ e.stopPropagation();
+ return false;
+ }
+ return undefined;
+ }
+ newWindow.addEventListener("fullscreen", onFullScreen);
+#endif
+
+ let promiseReady = new Promise(resolve => {
+ // Window creation and destruction is asynchronous. We need to wait
+ // until all existing windows are fully closed, and the new window is
+ // fully open, before continuing. Otherwise the rest of the sanitizer
+ // could run too early (and miss new cookies being set when a page
+ // closes) and/or run too late (and not have a fully-formed window yet
+ // in existence). See bug 1088137.
+ let newWindowOpened = false;
+ let onWindowOpened = function(subject, topic, data) {
+ if (subject != newWindow)
+ return;
+
+ Services.obs.removeObserver(onWindowOpened, "browser-delayed-startup-finished");
+#ifdef XP_MACOSX
+ newWindow.removeEventListener("fullscreen", onFullScreen);
+#endif
+ newWindowOpened = true;
+ // If we're the last thing to happen, invoke callback.
+ if (numWindowsClosing == 0) {
+ TelemetryStopwatch.finish("FX_SANITIZE_OPENWINDOWS", refObj);
+ resolve();
+ }
+ }
+
+ let numWindowsClosing = windowList.length;
+ let onWindowClosed = function() {
+ numWindowsClosing--;
+ if (numWindowsClosing == 0) {
+ Services.obs.removeObserver(onWindowClosed, "xul-window-destroyed");
+ // If we're the last thing to happen, invoke callback.
+ if (newWindowOpened) {
+ TelemetryStopwatch.finish("FX_SANITIZE_OPENWINDOWS", refObj);
+ resolve();
+ }
+ }
+ }
+ Services.obs.addObserver(onWindowOpened, "browser-delayed-startup-finished", false);
+ Services.obs.addObserver(onWindowClosed, "xul-window-destroyed", false);
+ });
+
+ // Start the process of closing windows
+ while (windowList.length) {
+ windowList.pop().close();
+ }
+ newWindow.focus();
+ yield promiseReady;
+ })
+ },
+
+ pluginData: {
+ clear: Task.async(function* (range) {
+ yield Sanitizer.clearPluginData(range);
+ }),
+ },
+ }
+};
+
+// The preferences branch for the sanitizer.
+Sanitizer.PREF_DOMAIN = "privacy.sanitize.";
+// Whether we should sanitize on shutdown.
+Sanitizer.PREF_SANITIZE_ON_SHUTDOWN = "privacy.sanitize.sanitizeOnShutdown";
+// During a sanitization this is set to a json containing the array of items
+// being sanitized, then cleared once the sanitization is complete.
+// This allows to retry a sanitization on startup in case it was interrupted
+// by a crash.
+Sanitizer.PREF_SANITIZE_IN_PROGRESS = "privacy.sanitize.sanitizeInProgress";
+// Whether the previous shutdown sanitization completed successfully.
+// This is used to detect cases where we were supposed to sanitize on shutdown
+// but due to a crash we were unable to. In such cases there may not be any
+// sanitization in progress, cause we didn't have a chance to start it yet.
+Sanitizer.PREF_SANITIZE_DID_SHUTDOWN = "privacy.sanitize.didShutdownSanitize";
+
+// Time span constants corresponding to values of the privacy.sanitize.timeSpan
+// pref. Used to determine how much history to clear, for various items
+Sanitizer.TIMESPAN_EVERYTHING = 0;
+Sanitizer.TIMESPAN_HOUR = 1;
+Sanitizer.TIMESPAN_2HOURS = 2;
+Sanitizer.TIMESPAN_4HOURS = 3;
+Sanitizer.TIMESPAN_TODAY = 4;
+Sanitizer.TIMESPAN_5MIN = 5;
+Sanitizer.TIMESPAN_24HOURS = 6;
+
+// Return a 2 element array representing the start and end times,
+// in the uSec-since-epoch format that PRTime likes. If we should
+// clear everything, return null. Use ts if it is defined; otherwise
+// use the timeSpan pref.
+Sanitizer.getClearRange = function(ts) {
+ if (ts === undefined)
+ ts = Sanitizer.prefs.getIntPref("timeSpan");
+ if (ts === Sanitizer.TIMESPAN_EVERYTHING)
+ return null;
+
+ // PRTime is microseconds while JS time is milliseconds
+ var endDate = Date.now() * 1000;
+ switch (ts) {
+ case Sanitizer.TIMESPAN_5MIN :
+ var startDate = endDate - 300000000; // 5*60*1000000
+ break;
+ case Sanitizer.TIMESPAN_HOUR :
+ startDate = endDate - 3600000000; // 1*60*60*1000000
+ break;
+ case Sanitizer.TIMESPAN_2HOURS :
+ startDate = endDate - 7200000000; // 2*60*60*1000000
+ break;
+ case Sanitizer.TIMESPAN_4HOURS :
+ startDate = endDate - 14400000000; // 4*60*60*1000000
+ break;
+ case Sanitizer.TIMESPAN_TODAY :
+ var d = new Date(); // Start with today
+ d.setHours(0); // zero us back to midnight...
+ d.setMinutes(0);
+ d.setSeconds(0);
+ startDate = d.valueOf() * 1000; // convert to epoch usec
+ break;
+ case Sanitizer.TIMESPAN_24HOURS :
+ startDate = endDate - 86400000000; // 24*60*60*1000000
+ break;
+ default:
+ throw "Invalid time span for clear private data: " + ts;
+ }
+ return [startDate, endDate];
+};
+
+Sanitizer.clearPluginData = Task.async(function* (range) {
+ // Clear plugin data.
+ // As evidenced in bug 1253204, clearing plugin data can sometimes be
+ // very, very long, for mysterious reasons. Unfortunately, this is not
+ // something actionable by Mozilla, so crashing here serves no purpose.
+ //
+ // For this reason, instead of waiting for sanitization to always
+ // complete, we introduce a soft timeout. Once this timeout has
+ // elapsed, we proceed with the shutdown of Firefox.
+ let seenException;
+
+ let promiseClearPluginData = Task.async(function* () {
+ const FLAG_CLEAR_ALL = Ci.nsIPluginHost.FLAG_CLEAR_ALL;
+ let ph = Cc["@mozilla.org/plugin/host;1"].getService(Ci.nsIPluginHost);
+
+ // Determine age range in seconds. (-1 means clear all.) We don't know
+ // that range[1] is actually now, so we compute age range based
+ // on the lower bound. If range results in a negative age, do nothing.
+ let age = range ? (Date.now() / 1000 - range[0] / 1000000) : -1;
+ if (!range || age >= 0) {
+ let tags = ph.getPluginTags();
+ for (let tag of tags) {
+ let refObj = {};
+ let probe = "";
+ if (/\bFlash\b/.test(tag.name)) {
+ probe = tag.loaded ? "FX_SANITIZE_LOADED_FLASH"
+ : "FX_SANITIZE_UNLOADED_FLASH";
+ TelemetryStopwatch.start(probe, refObj);
+ }
+ try {
+ let rv = yield new Promise(resolve =>
+ ph.clearSiteData(tag, null, FLAG_CLEAR_ALL, age, resolve)
+ );
+ // If the plugin doesn't support clearing by age, clear everything.
+ if (rv == Components.results.NS_ERROR_PLUGIN_TIME_RANGE_NOT_SUPPORTED) {
+ yield new Promise(resolve =>
+ ph.clearSiteData(tag, null, FLAG_CLEAR_ALL, -1, resolve)
+ );
+ }
+ if (probe) {
+ TelemetryStopwatch.finish(probe, refObj);
+ }
+ } catch (ex) {
+ // Ignore errors from plug-ins
+ if (probe) {
+ TelemetryStopwatch.cancel(probe, refObj);
+ }
+ }
+ }
+ }
+ });
+
+ try {
+ // We don't want to wait for this operation to complete...
+ promiseClearPluginData = promiseClearPluginData(range);
+
+ // ... at least, not for more than 10 seconds.
+ yield Promise.race([
+ promiseClearPluginData,
+ new Promise(resolve => setTimeout(resolve, 10000 /* 10 seconds */))
+ ]);
+ } catch (ex) {
+ seenException = ex;
+ }
+
+ // Detach waiting for plugin data to be cleared.
+ promiseClearPluginData.catch(() => {
+ // If this exception is raised before the soft timeout, it
+ // will appear in `seenException`. Otherwise, it's too late
+ // to do anything about it.
+ });
+
+ if (seenException) {
+ throw seenException;
+ }
+});
+
+Sanitizer._prefs = null;
+Sanitizer.__defineGetter__("prefs", function() {
+ return Sanitizer._prefs ? Sanitizer._prefs
+ : Sanitizer._prefs = Components.classes["@mozilla.org/preferences-service;1"]
+ .getService(Components.interfaces.nsIPrefService)
+ .getBranch(Sanitizer.PREF_DOMAIN);
+});
+
+// Shows sanitization UI
+Sanitizer.showUI = function(aParentWindow) {
+#ifdef XP_MACOSX
+ let win = null;
+#else
+ let win = aParentWindow;
+#endif
+ Services.ww.openWindow(win,
+ "chrome://browser/content/sanitize.xul",
+ "Sanitize",
+ "chrome,titlebar,dialog,centerscreen,modal",
+ null);
+};
+
+/**
+ * Deletes privacy sensitive data in a batch, optionally showing the
+ * sanitize UI, according to user preferences
+ */
+Sanitizer.sanitize = function(aParentWindow) {
+ Sanitizer.showUI(aParentWindow);
+};
+
+Sanitizer.onStartup = Task.async(function*() {
+ // Check if we were interrupted during the last shutdown sanitization.
+ let shutownSanitizationWasInterrupted =
+ Preferences.get(Sanitizer.PREF_SANITIZE_ON_SHUTDOWN, false) &&
+ !Preferences.has(Sanitizer.PREF_SANITIZE_DID_SHUTDOWN);
+
+ if (Preferences.has(Sanitizer.PREF_SANITIZE_DID_SHUTDOWN)) {
+ // Reset the pref, so that if we crash before having a chance to
+ // sanitize on shutdown, we will do at the next startup.
+ // Flushing prefs has a cost, so do this only if necessary.
+ Preferences.reset(Sanitizer.PREF_SANITIZE_DID_SHUTDOWN);
+ Services.prefs.savePrefFile(null);
+ }
+
+ // Make sure that we are triggered during shutdown.
+ let shutdownClient = Cc["@mozilla.org/browser/nav-history-service;1"]
+ .getService(Ci.nsPIPlacesDatabase)
+ .shutdownClient
+ .jsclient;
+ // We need to pass to sanitize() (through sanitizeOnShutdown) a state object
+ // that tracks the status of the shutdown blocker. This `progress` object
+ // will be updated during sanitization and reported with the crash in case of
+ // a shutdown timeout.
+ // We use the `options` argument to pass the `progress` object to sanitize().
+ let progress = { isShutdown: true };
+ shutdownClient.addBlocker("sanitize.js: Sanitize on shutdown",
+ () => sanitizeOnShutdown({ progress }),
+ {
+ fetchState: () => ({ progress })
+ }
+ );
+
+ // Check if Firefox crashed during a sanitization.
+ let lastInterruptedSanitization = Preferences.get(Sanitizer.PREF_SANITIZE_IN_PROGRESS, "");
+ if (lastInterruptedSanitization) {
+ let s = new Sanitizer();
+ // If the json is invalid this will just throw and reject the Task.
+ let itemsToClear = JSON.parse(lastInterruptedSanitization);
+ yield s.sanitize(itemsToClear);
+ } else if (shutownSanitizationWasInterrupted) {
+ // Otherwise, could be we were supposed to sanitize on shutdown but we
+ // didn't have a chance, due to an earlier crash.
+ // In such a case, just redo a shutdown sanitize now, during startup.
+ yield sanitizeOnShutdown();
+ }
+});
+
+var sanitizeOnShutdown = Task.async(function*(options = {}) {
+ if (!Preferences.get(Sanitizer.PREF_SANITIZE_ON_SHUTDOWN)) {
+ return;
+ }
+ // Need to sanitize upon shutdown
+ let s = new Sanitizer();
+ s.prefDomain = "privacy.clearOnShutdown.";
+ s.isShutDown = true;
+ yield s.sanitize(null, options);
+ // We didn't crash during shutdown sanitization, so annotate it to avoid
+ // sanitizing again on startup.
+ Preferences.set(Sanitizer.PREF_SANITIZE_DID_SHUTDOWN, true);
+ Services.prefs.savePrefFile(null);
+});