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Diffstat (limited to 'toolkit/components/antitracking/PurgeTrackerService.sys.mjs')
| -rw-r--r-- | toolkit/components/antitracking/PurgeTrackerService.sys.mjs | 471 |
1 files changed, 471 insertions, 0 deletions
diff --git a/toolkit/components/antitracking/PurgeTrackerService.sys.mjs b/toolkit/components/antitracking/PurgeTrackerService.sys.mjs new file mode 100644 index 0000000000..42314954a7 --- /dev/null +++ b/toolkit/components/antitracking/PurgeTrackerService.sys.mjs @@ -0,0 +1,471 @@ +/* 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/. */ + +import { XPCOMUtils } from "resource://gre/modules/XPCOMUtils.sys.mjs"; + +const THREE_DAYS_MS = 3 * 24 * 60 * 1000; + +const lazy = {}; + +XPCOMUtils.defineLazyServiceGetter( + lazy, + "gClassifier", + "@mozilla.org/url-classifier/dbservice;1", + "nsIURIClassifier" +); +XPCOMUtils.defineLazyServiceGetter( + lazy, + "gStorageActivityService", + "@mozilla.org/storage/activity-service;1", + "nsIStorageActivityService" +); + +XPCOMUtils.defineLazyGetter(lazy, "gClassifierFeature", () => { + return lazy.gClassifier.getFeatureByName("tracking-annotation"); +}); + +XPCOMUtils.defineLazyGetter(lazy, "logger", () => { + return console.createInstance({ + prefix: "*** PurgeTrackerService:", + maxLogLevelPref: "privacy.purge_trackers.logging.level", + }); +}); + +XPCOMUtils.defineLazyPreferenceGetter( + lazy, + "gConsiderEntityList", + "privacy.purge_trackers.consider_entity_list" +); + +export function PurgeTrackerService() {} + +PurgeTrackerService.prototype = { + classID: Components.ID("{90d1fd17-2018-4e16-b73c-a04a26fa6dd4}"), + QueryInterface: ChromeUtils.generateQI(["nsIPurgeTrackerService"]), + + // Purging is batched for cookies to avoid clearing too much data + // at once. This flag tells us whether this is the first daily iteration. + _firstIteration: true, + + // We can only know asynchronously if a host is matched by the tracking + // protection list, so we cache the result for faster future lookups. + _trackingState: new Map(), + + observe(aSubject, aTopic, aData) { + switch (aTopic) { + case "idle-daily": + // only allow one idle-daily listener to trigger until the list has been fully parsed. + Services.obs.removeObserver(this, "idle-daily"); + this.purgeTrackingCookieJars(); + break; + case "profile-after-change": + Services.obs.addObserver(this, "idle-daily"); + break; + } + }, + + async isTracker(principal) { + if (principal.isNullPrincipal || principal.isSystemPrincipal) { + return false; + } + let host; + try { + host = principal.asciiHost; + } catch (error) { + return false; + } + + if (!this._trackingState.has(host)) { + // Temporarily set to false to avoid doing several lookups if a site has + // several subframes on the same domain. + this._trackingState.set(host, false); + + await new Promise(resolve => { + try { + lazy.gClassifier.asyncClassifyLocalWithFeatures( + principal.URI, + [lazy.gClassifierFeature], + Ci.nsIUrlClassifierFeature.blocklist, + list => { + if (list.length) { + this._trackingState.set(host, true); + } + resolve(); + } + ); + } catch { + // Error in asyncClassifyLocalWithFeatures, it is not a tracker. + this._trackingState.set(host, false); + resolve(); + } + }); + } + + return this._trackingState.get(host); + }, + + isAllowedThirdParty(firstPartyOriginNoSuffix, thirdPartyHost) { + let uri = Services.io.newURI( + `${firstPartyOriginNoSuffix}/?resource=${thirdPartyHost}` + ); + lazy.logger.debug(`Checking entity list state for`, uri.spec); + return new Promise(resolve => { + try { + lazy.gClassifier.asyncClassifyLocalWithFeatures( + uri, + [lazy.gClassifierFeature], + Ci.nsIUrlClassifierFeature.entitylist, + list => { + let sameList = !!list.length; + lazy.logger.debug(`Is ${uri.spec} on the entity list?`, sameList); + resolve(sameList); + } + ); + } catch { + resolve(false); + } + }); + }, + + async maybePurgePrincipal(principal) { + let origin = principal.origin; + lazy.logger.debug(`Maybe purging ${origin}.`); + + // First, check if any site with that base domain had received + // user interaction in the last N days. + let hasInteraction = this._baseDomainsWithInteraction.has( + principal.baseDomain + ); + // Exit early unless we want to see if we're dealing with a tracker, + // for telemetry. + if (hasInteraction && !Services.telemetry.canRecordPrereleaseData) { + lazy.logger.debug(`${origin} has user interaction, exiting.`); + return; + } + + // Second, confirm that we're looking at a tracker. + let isTracker = await this.isTracker(principal); + if (!isTracker) { + lazy.logger.debug(`${origin} is not a tracker, exiting.`); + return; + } + + if (hasInteraction) { + let expireTimeMs = this._baseDomainsWithInteraction.get( + principal.baseDomain + ); + + // Collect how much longer the user interaction will be valid for, in hours. + let timeRemaining = Math.floor( + (expireTimeMs - Date.now()) / 1000 / 60 / 60 / 24 + ); + let permissionAgeHistogram = Services.telemetry.getHistogramById( + "COOKIE_PURGING_TRACKERS_USER_INTERACTION_REMAINING_DAYS" + ); + permissionAgeHistogram.add(timeRemaining); + + this._telemetryData.notPurged.add(principal.baseDomain); + + lazy.logger.debug(`${origin} is a tracker with interaction, exiting.`); + return; + } + + let isAllowedThirdParty = false; + if ( + lazy.gConsiderEntityList || + Services.telemetry.canRecordPrereleaseData + ) { + for (let firstPartyPrincipal of this._principalsWithInteraction) { + if ( + await this.isAllowedThirdParty( + firstPartyPrincipal.originNoSuffix, + principal.asciiHost + ) + ) { + isAllowedThirdParty = true; + break; + } + } + } + + if (isAllowedThirdParty && lazy.gConsiderEntityList) { + lazy.logger.debug( + `${origin} has interaction on the entity list, exiting.` + ); + return; + } + + lazy.logger.log("Deleting data from:", origin); + + await new Promise(resolve => { + Services.clearData.deleteDataFromPrincipal( + principal, + false, + Ci.nsIClearDataService.CLEAR_ALL_CACHES | + Ci.nsIClearDataService.CLEAR_COOKIES | + Ci.nsIClearDataService.CLEAR_DOM_STORAGES | + Ci.nsIClearDataService.CLEAR_CLIENT_AUTH_REMEMBER_SERVICE | + Ci.nsIClearDataService.CLEAR_EME | + Ci.nsIClearDataService.CLEAR_MEDIA_DEVICES | + Ci.nsIClearDataService.CLEAR_STORAGE_ACCESS | + Ci.nsIClearDataService.CLEAR_AUTH_TOKENS | + Ci.nsIClearDataService.CLEAR_AUTH_CACHE, + resolve + ); + }); + lazy.logger.log(`Data deleted from:`, origin); + + this._telemetryData.purged.add(principal.baseDomain); + }, + + resetPurgeList() { + // We've reached the end of the cookies. + // Restore the idle-daily listener so it will purge again tomorrow. + Services.obs.addObserver(this, "idle-daily"); + // Set the date to 0 so we will start at the beginning of the list next time. + Services.prefs.setStringPref( + "privacy.purge_trackers.date_in_cookie_database", + "0" + ); + }, + + submitTelemetry() { + let { purged, notPurged, durationIntervals } = this._telemetryData; + let now = Date.now(); + let lastPurge = Number( + Services.prefs.getStringPref("privacy.purge_trackers.last_purge", now) + ); + + let intervalHistogram = Services.telemetry.getHistogramById( + "COOKIE_PURGING_INTERVAL_HOURS" + ); + let hoursBetween = Math.floor((now - lastPurge) / 1000 / 60 / 60); + intervalHistogram.add(hoursBetween); + + Services.prefs.setStringPref( + "privacy.purge_trackers.last_purge", + now.toString() + ); + + let purgedHistogram = Services.telemetry.getHistogramById( + "COOKIE_PURGING_ORIGINS_PURGED" + ); + purgedHistogram.add(purged.size); + + let notPurgedHistogram = Services.telemetry.getHistogramById( + "COOKIE_PURGING_TRACKERS_WITH_USER_INTERACTION" + ); + notPurgedHistogram.add(notPurged.size); + + let duration = durationIntervals + .map(([start, end]) => end - start) + .reduce((acc, cur) => acc + cur, 0); + + let durationHistogram = Services.telemetry.getHistogramById( + "COOKIE_PURGING_DURATION_MS" + ); + durationHistogram.add(duration); + }, + + /** + * This loops through all cookies saved in the database and checks if they are a tracking cookie, if it is it checks + * that they have an interaction permission which is still valid. If the Permission is not valid we delete all data + * associated with the site that owns that cookie. + */ + async purgeTrackingCookieJars() { + let purgeEnabled = Services.prefs.getBoolPref( + "privacy.purge_trackers.enabled", + false + ); + + let sanitizeOnShutdownEnabled = Services.prefs.getBoolPref( + "privacy.sanitize.sanitizeOnShutdown", + false + ); + + let clearHistoryOnShutdown = Services.prefs.getBoolPref( + "privacy.clearOnShutdown.history", + false + ); + + let clearSiteSettingsOnShutdown = Services.prefs.getBoolPref( + "privacy.clearOnShutdown.siteSettings", + false + ); + + // This is a hotfix for bug 1672394. It avoids purging if the user has enabled mechanisms + // that regularly clear the storageAccessAPI permission, such as clearing history or + // "site settings" (permissions) on shutdown. + if ( + sanitizeOnShutdownEnabled && + (clearHistoryOnShutdown || clearSiteSettingsOnShutdown) + ) { + lazy.logger.log( + ` + Purging canceled because interaction permissions are cleared on shutdown. + sanitizeOnShutdownEnabled: ${sanitizeOnShutdownEnabled}, + clearHistoryOnShutdown: ${clearHistoryOnShutdown}, + clearSiteSettingsOnShutdown: ${clearSiteSettingsOnShutdown}, + ` + ); + this.resetPurgeList(); + return; + } + + // Purge cookie jars for following cookie behaviors. + // * BEHAVIOR_REJECT_FOREIGN + // * BEHAVIOR_LIMIT_FOREIGN + // * BEHAVIOR_REJECT_TRACKER (ETP) + // * BEHAVIOR_REJECT_TRACKER_AND_PARTITION_FOREIGN (dFPI) + let cookieBehavior = Services.cookies.getCookieBehavior(false); + + let activeWithCookieBehavior = + cookieBehavior == Ci.nsICookieService.BEHAVIOR_REJECT_FOREIGN || + cookieBehavior == Ci.nsICookieService.BEHAVIOR_LIMIT_FOREIGN || + cookieBehavior == Ci.nsICookieService.BEHAVIOR_REJECT_TRACKER || + cookieBehavior == + Ci.nsICookieService.BEHAVIOR_REJECT_TRACKER_AND_PARTITION_FOREIGN; + + if (!activeWithCookieBehavior || !purgeEnabled) { + lazy.logger.log( + `returning early, activeWithCookieBehavior: ${activeWithCookieBehavior}, purgeEnabled: ${purgeEnabled}` + ); + this.resetPurgeList(); + return; + } + lazy.logger.log("Purging trackers enabled, beginning batch."); + // How many cookies to loop through in each batch before we quit + const MAX_PURGE_COUNT = Services.prefs.getIntPref( + "privacy.purge_trackers.max_purge_count", + 100 + ); + + if (this._firstIteration) { + this._telemetryData = { + durationIntervals: [], + purged: new Set(), + notPurged: new Set(), + }; + + this._baseDomainsWithInteraction = new Map(); + this._principalsWithInteraction = []; + for (let perm of Services.perms.getAllWithTypePrefix( + "storageAccessAPI" + )) { + this._baseDomainsWithInteraction.set( + perm.principal.baseDomain, + perm.expireTime + ); + this._principalsWithInteraction.push(perm.principal); + } + } + + // Record how long this iteration took for telemetry. + // This is a tuple of start and end time, the second + // part will be added at the end of this function. + let duration = [Cu.now()]; + + /** + * We record the creationTime of the last cookie we looked at and + * start from there next time. This way even if new cookies are added or old ones are deleted we + * have a reliable way of finding our spot. + **/ + let saved_date = Services.prefs.getStringPref( + "privacy.purge_trackers.date_in_cookie_database", + "0" + ); + + let maybeClearPrincipals = new Map(); + + // TODO We only need the host name and creationTime, this gives too much info. See bug 1610373. + let cookies = Services.cookies.getCookiesSince(saved_date); + cookies = cookies.slice(0, MAX_PURGE_COUNT); + + for (let cookie of cookies) { + let httpPrincipal; + let httpsPrincipal; + + let origin = + "http://" + + cookie.rawHost + + ChromeUtils.originAttributesToSuffix(cookie.originAttributes); + try { + httpPrincipal = + Services.scriptSecurityManager.createContentPrincipalFromOrigin( + origin + ); + } catch (e) { + lazy.logger.error( + `Creating principal from origin ${origin} led to error ${e}.` + ); + } + if (httpPrincipal) { + maybeClearPrincipals.set(httpPrincipal.origin, httpPrincipal); + } + + origin = + "https://" + + cookie.rawHost + + ChromeUtils.originAttributesToSuffix(cookie.originAttributes); + try { + httpsPrincipal = + Services.scriptSecurityManager.createContentPrincipalFromOrigin( + origin + ); + } catch (e) { + lazy.logger.error( + `Creating principal from origin ${origin} led to error ${e}.` + ); + } + if (httpsPrincipal) { + maybeClearPrincipals.set(httpsPrincipal.origin, httpsPrincipal); + } + + saved_date = cookie.creationTime; + } + + // We only consider recently active storage and don't batch it, + // so only do this in the first iteration. + if (this._firstIteration) { + let startDate = Date.now() - THREE_DAYS_MS; + let storagePrincipals = lazy.gStorageActivityService.getActiveOrigins( + startDate * 1000, + Date.now() * 1000 + ); + + for (let principal of storagePrincipals.enumerate()) { + maybeClearPrincipals.set(principal.origin, principal); + } + } + + for (let principal of maybeClearPrincipals.values()) { + await this.maybePurgePrincipal(principal); + } + + Services.prefs.setStringPref( + "privacy.purge_trackers.date_in_cookie_database", + saved_date + ); + + duration.push(Cu.now()); + this._telemetryData.durationIntervals.push(duration); + + // We've reached the end, no need to repeat again until next idle-daily. + if (!cookies.length || cookies.length < 100) { + lazy.logger.log( + "All cookie purging finished, resetting list until tomorrow." + ); + this.resetPurgeList(); + this.submitTelemetry(); + this._firstIteration = true; + return; + } + + lazy.logger.log("Batch finished, queueing next batch."); + this._firstIteration = false; + Services.tm.idleDispatchToMainThread(() => { + this.purgeTrackingCookieJars(); + }); + }, +}; |