forked from mirrors/gecko-dev
46e51631a9
MozReview-Commit-ID: K5RcpmiXFYR --HG-- extra : rebase_source : 7d9c48c658fc04b0430965e93476063d3cff4a7f
734 lines
24 KiB
JavaScript
734 lines
24 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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const Cc = Components.classes;
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const Ci = Components.interfaces;
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const Cr = Components.results;
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const Cu = Components.utils;
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// COMPLETE_LENGTH and PARTIAL_LENGTH copied from nsUrlClassifierDBService.h,
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// they correspond to the length, in bytes, of a hash prefix and the total
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// hash.
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const COMPLETE_LENGTH = 32;
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const PARTIAL_LENGTH = 4;
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Cu.import("resource://gre/modules/XPCOMUtils.jsm");
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Cu.import("resource://gre/modules/Services.jsm");
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Cu.import("resource://gre/modules/NetUtil.jsm");
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XPCOMUtils.defineLazyServiceGetter(this, 'gDbService',
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'@mozilla.org/url-classifier/dbservice;1',
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'nsIUrlClassifierDBService');
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XPCOMUtils.defineLazyServiceGetter(this, 'gUrlUtil',
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'@mozilla.org/url-classifier/utils;1',
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'nsIUrlClassifierUtils');
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// Log only if browser.safebrowsing.debug is true
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function log(...stuff) {
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let logging = null;
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try {
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logging = Services.prefs.getBoolPref("browser.safebrowsing.debug");
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} catch(e) {
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return;
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}
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if (!logging) {
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return;
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}
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var d = new Date();
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let msg = "hashcompleter: " + d.toTimeString() + ": " + stuff.join(" ");
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dump(Services.urlFormatter.trimSensitiveURLs(msg) + "\n");
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}
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// Map the HTTP response code to a Telemetry bucket
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// https://developers.google.com/safe-browsing/developers_guide_v2?hl=en
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function httpStatusToBucket(httpStatus) {
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var statusBucket;
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switch (httpStatus) {
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case 100:
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case 101:
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// Unexpected 1xx return code
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statusBucket = 0;
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break;
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case 200:
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// OK - Data is available in the HTTP response body.
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statusBucket = 1;
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break;
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case 201:
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case 202:
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case 203:
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case 205:
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case 206:
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// Unexpected 2xx return code
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statusBucket = 2;
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break;
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case 204:
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// No Content - There are no full-length hashes with the requested prefix.
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statusBucket = 3;
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break;
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case 300:
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case 301:
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case 302:
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case 303:
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case 304:
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case 305:
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case 307:
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case 308:
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// Unexpected 3xx return code
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statusBucket = 4;
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break;
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case 400:
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// Bad Request - The HTTP request was not correctly formed.
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// The client did not provide all required CGI parameters.
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statusBucket = 5;
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break;
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case 401:
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case 402:
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case 405:
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case 406:
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case 407:
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case 409:
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case 410:
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case 411:
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case 412:
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case 414:
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case 415:
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case 416:
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case 417:
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case 421:
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case 426:
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case 428:
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case 429:
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case 431:
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case 451:
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// Unexpected 4xx return code
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statusBucket = 6;
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break;
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case 403:
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// Forbidden - The client id is invalid.
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statusBucket = 7;
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break;
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case 404:
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// Not Found
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statusBucket = 8;
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break;
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case 408:
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// Request Timeout
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statusBucket = 9;
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break;
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case 413:
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// Request Entity Too Large - Bug 1150334
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statusBucket = 10;
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break;
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case 500:
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case 501:
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case 510:
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// Unexpected 5xx return code
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statusBucket = 11;
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break;
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case 502:
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case 504:
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case 511:
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// Local network errors, we'll ignore these.
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statusBucket = 12;
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break;
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case 503:
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// Service Unavailable - The server cannot handle the request.
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// Clients MUST follow the backoff behavior specified in the
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// Request Frequency section.
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statusBucket = 13;
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break;
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case 505:
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// HTTP Version Not Supported - The server CANNOT handle the requested
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// protocol major version.
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statusBucket = 14;
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break;
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default:
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statusBucket = 15;
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};
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return statusBucket;
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}
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function HashCompleter() {
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// The current HashCompleterRequest in flight. Once it is started, it is set
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// to null. It may be used by multiple calls to |complete| in succession to
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// avoid creating multiple requests to the same gethash URL.
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this._currentRequest = null;
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// A map of gethashUrls to HashCompleterRequests that haven't yet begun.
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this._pendingRequests = {};
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// A map of gethash URLs to RequestBackoff objects.
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this._backoffs = {};
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// Whether we have been informed of a shutdown by the shutdown event.
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this._shuttingDown = false;
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Services.obs.addObserver(this, "quit-application", false);
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}
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HashCompleter.prototype = {
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classID: Components.ID("{9111de73-9322-4bfc-8b65-2b727f3e6ec8}"),
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QueryInterface: XPCOMUtils.generateQI([Ci.nsIUrlClassifierHashCompleter,
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Ci.nsIRunnable,
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Ci.nsIObserver,
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Ci.nsISupportsWeakReference,
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Ci.nsITimerCallback,
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Ci.nsISupports]),
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// This is mainly how the HashCompleter interacts with other components.
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// Even though it only takes one partial hash and callback, subsequent
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// calls are made into the same HTTP request by using a thread dispatch.
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complete: function HC_complete(aPartialHash, aGethashUrl, aTableName, aCallback) {
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if (!aGethashUrl) {
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throw Cr.NS_ERROR_NOT_INITIALIZED;
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}
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if (!this._currentRequest) {
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this._currentRequest = new HashCompleterRequest(this, aGethashUrl);
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}
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if (this._currentRequest.gethashUrl == aGethashUrl) {
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this._currentRequest.add(aPartialHash, aCallback, aTableName);
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} else {
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if (!this._pendingRequests[aGethashUrl]) {
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this._pendingRequests[aGethashUrl] =
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new HashCompleterRequest(this, aGethashUrl);
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}
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this._pendingRequests[aGethashUrl].add(aPartialHash, aCallback, aTableName);
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}
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if (!this._backoffs[aGethashUrl]) {
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// Initialize request backoffs separately, since requests are deleted
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// after they are dispatched.
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var jslib = Cc["@mozilla.org/url-classifier/jslib;1"]
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.getService().wrappedJSObject;
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// Using the V4 backoff algorithm for both V2 and V4. See bug 1273398.
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this._backoffs[aGethashUrl] = new jslib.RequestBackoffV4(
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10 /* keep track of max requests */,
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0 /* don't throttle on successful requests per time period */);
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}
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// Start off this request. Without dispatching to a thread, every call to
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// complete makes an individual HTTP request.
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Services.tm.currentThread.dispatch(this, Ci.nsIThread.DISPATCH_NORMAL);
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},
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// This is called after several calls to |complete|, or after the
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// currentRequest has finished. It starts off the HTTP request by making a
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// |begin| call to the HashCompleterRequest.
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run: function() {
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// Clear everything on shutdown
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if (this._shuttingDown) {
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this._currentRequest = null;
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this._pendingRequests = null;
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for (var url in this._backoffs) {
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this._backoffs[url] = null;
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}
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throw Cr.NS_ERROR_NOT_INITIALIZED;
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}
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// If we don't have an in-flight request, make one
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let pendingUrls = Object.keys(this._pendingRequests);
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if (!this._currentRequest && (pendingUrls.length > 0)) {
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let nextUrl = pendingUrls[0];
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this._currentRequest = this._pendingRequests[nextUrl];
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delete this._pendingRequests[nextUrl];
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}
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if (this._currentRequest) {
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try {
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this._currentRequest.begin();
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} finally {
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// If |begin| fails, we should get rid of our request.
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this._currentRequest = null;
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}
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}
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},
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// Pass the server response status to the RequestBackoff for the given
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// gethashUrl and fetch the next pending request, if there is one.
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finishRequest: function(url, aStatus) {
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this._backoffs[url].noteServerResponse(aStatus);
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Services.tm.currentThread.dispatch(this, Ci.nsIThread.DISPATCH_NORMAL);
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},
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// Returns true if we can make a request from the given url, false otherwise.
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canMakeRequest: function(aGethashUrl) {
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return this._backoffs[aGethashUrl].canMakeRequest();
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},
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// Notifies the RequestBackoff of a new request so we can throttle based on
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// max requests/time period. This must be called before a channel is opened,
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// and finishRequest must be called once the response is received.
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noteRequest: function(aGethashUrl) {
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return this._backoffs[aGethashUrl].noteRequest();
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},
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observe: function HC_observe(aSubject, aTopic, aData) {
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if (aTopic == "quit-application") {
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this._shuttingDown = true;
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Services.obs.removeObserver(this, "quit-application");
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}
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},
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};
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function HashCompleterRequest(aCompleter, aGethashUrl) {
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// HashCompleter object that created this HashCompleterRequest.
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this._completer = aCompleter;
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// The internal set of hashes and callbacks that this request corresponds to.
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this._requests = [];
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// nsIChannel that the hash completion query is transmitted over.
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this._channel = null;
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// Response body of hash completion. Created in onDataAvailable.
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this._response = "";
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// Whether we have been informed of a shutdown by the quit-application event.
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this._shuttingDown = false;
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this.gethashUrl = aGethashUrl;
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// Multiple partial hashes can be associated with the same tables
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// so we use a map here.
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this.tableNames = new Map();
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this.telemetryProvider = "";
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}
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HashCompleterRequest.prototype = {
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QueryInterface: XPCOMUtils.generateQI([Ci.nsIRequestObserver,
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Ci.nsIStreamListener,
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Ci.nsIObserver,
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Ci.nsISupports]),
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// This is called by the HashCompleter to add a hash and callback to the
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// HashCompleterRequest. It must be called before calling |begin|.
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add: function HCR_add(aPartialHash, aCallback, aTableName) {
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this._requests.push({
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partialHash: aPartialHash,
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callback: aCallback,
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responses: []
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});
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if (aTableName) {
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let isTableNameV4 = aTableName.endsWith('-proto');
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if (0 === this.tableNames.size) {
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// Decide if this request is v4 by the first added partial hash.
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this.isV4 = isTableNameV4;
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} else if (this.isV4 !== isTableNameV4) {
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log('ERROR: Cannot mix "proto" tables with other types within ' +
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'the same gethash URL.');
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}
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this.tableNames.set(aTableName);
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// Assuming all tables with the same gethash URL have the same provider
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if (this.telemetryProvider == "") {
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this.telemetryProvider = gUrlUtil.getTelemetryProvider(aTableName);
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}
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}
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},
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fillTableStatesBase64: function HCR_fillTableStatesBase64(aCallback) {
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gDbService.getTables(aTableData => {
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aTableData.split("\n").forEach(line => {
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let p = line.indexOf(";");
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if (-1 === p) {
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return;
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}
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// [tableName];[stateBase64]:[checksumBase64]
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let tableName = line.substring(0, p);
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if (this.tableNames.has(tableName)) {
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let metadata = line.substring(p + 1).split(":");
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let stateBase64 = metadata[0];
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this.tableNames.set(tableName, stateBase64);
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}
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});
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aCallback();
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});
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},
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// This initiates the HTTP request. It can fail due to backoff timings and
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// will notify all callbacks as necessary. We notify the backoff object on
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// begin.
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begin: function HCR_begin() {
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if (!this._completer.canMakeRequest(this.gethashUrl)) {
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log("Can't make request to " + this.gethashUrl + "\n");
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this.notifyFailure(Cr.NS_ERROR_ABORT);
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return;
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}
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Services.obs.addObserver(this, "quit-application", false);
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// V4 requires table states to build the request so we need
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// a async call to retrieve the table states from disk.
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// Note that |HCR_begin| is fine to be sync because
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// it doesn't appear in a sync call chain.
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this.fillTableStatesBase64(() => {
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try {
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this.openChannel();
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// Notify the RequestBackoff if opening the channel succeeded. At this
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// point, finishRequest must be called.
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this._completer.noteRequest(this.gethashUrl);
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}
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catch (err) {
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this.notifyFailure(err);
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throw err;
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}
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});
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},
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notify: function HCR_notify() {
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// If we haven't gotten onStopRequest, just cancel. This will call us
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// with onStopRequest since we implement nsIStreamListener on the
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// channel.
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if (this._channel && this._channel.isPending()) {
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log("cancelling request to " + this.gethashUrl + "\n");
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Services.telemetry.getKeyedHistogramById("URLCLASSIFIER_COMPLETE_TIMEOUT2").
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add(this.telemetryProvider, 1);
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this._channel.cancel(Cr.NS_BINDING_ABORTED);
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}
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},
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// Creates an nsIChannel for the request and fills the body.
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openChannel: function HCR_openChannel() {
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let loadFlags = Ci.nsIChannel.INHIBIT_CACHING |
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Ci.nsIChannel.LOAD_BYPASS_CACHE;
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let actualGethashUrl = this.gethashUrl;
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if (this.isV4) {
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// As per spec, we add the request payload to the gethash url.
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actualGethashUrl += "&$req=" + this.buildRequestV4();
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}
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log("actualGethashUrl: " + actualGethashUrl);
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let channel = NetUtil.newChannel({
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uri: actualGethashUrl,
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loadUsingSystemPrincipal: true
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});
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channel.loadFlags = loadFlags;
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// Disable keepalive.
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let httpChannel = channel.QueryInterface(Ci.nsIHttpChannel);
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httpChannel.setRequestHeader("Connection", "close", false);
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this._channel = channel;
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if (this.isV4) {
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httpChannel.setRequestHeader("X-HTTP-Method-Override", "POST", false);
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} else {
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let body = this.buildRequest();
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this.addRequestBody(body);
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}
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// Set a timer that cancels the channel after timeout_ms in case we
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// don't get a gethash response.
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this.timer_ = Cc["@mozilla.org/timer;1"].createInstance(Ci.nsITimer);
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// Ask the timer to use nsITimerCallback (.notify()) when ready
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let timeout = Services.prefs.getIntPref(
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"urlclassifier.gethash.timeout_ms");
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this.timer_.initWithCallback(this, timeout, this.timer_.TYPE_ONE_SHOT);
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channel.asyncOpen2(this);
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},
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buildRequestV4: function HCR_buildRequestV4() {
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// Convert the "name to state" mapping to two equal-length arrays.
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let tableNameArray = [];
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let stateArray = [];
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this.tableNames.forEach((state, name) => {
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// We skip the table which is not associated with a state.
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if (state) {
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tableNameArray.push(name);
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stateArray.push(state);
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}
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});
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// Build the "distinct" prefix array.
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let prefixSet = new Set();
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this._requests.forEach(r => prefixSet.add(btoa(r.partialHash)));
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let prefixArray = Array.from(prefixSet);
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log("Build v4 gethash request with " + JSON.stringify(tableNameArray) + ', '
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+ JSON.stringify(stateArray) + ', '
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+ JSON.stringify(prefixArray));
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return gUrlUtil.makeFindFullHashRequestV4(tableNameArray,
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stateArray,
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prefixArray,
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tableNameArray.length,
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prefixArray.length);
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},
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// Returns a string for the request body based on the contents of
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// this._requests.
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buildRequest: function HCR_buildRequest() {
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// Sometimes duplicate entries are sent to HashCompleter but we do not need
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// to propagate these to the server. (bug 633644)
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let prefixes = [];
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for (let i = 0; i < this._requests.length; i++) {
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let request = this._requests[i];
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if (prefixes.indexOf(request.partialHash) == -1) {
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prefixes.push(request.partialHash);
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}
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}
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|
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// Randomize the order to obscure the original request from noise
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// unbiased Fisher-Yates shuffle
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let i = prefixes.length;
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while (i--) {
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let j = Math.floor(Math.random() * (i + 1));
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let temp = prefixes[i];
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prefixes[i] = prefixes[j];
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prefixes[j] = temp;
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}
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let body;
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body = PARTIAL_LENGTH + ":" + (PARTIAL_LENGTH * prefixes.length) +
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"\n" + prefixes.join("");
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log('Requesting completions for ' + prefixes.length + ' ' + PARTIAL_LENGTH + '-byte prefixes: ' + body);
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return body;
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},
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// Sets the request body of this._channel.
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addRequestBody: function HCR_addRequestBody(aBody) {
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let inputStream = Cc["@mozilla.org/io/string-input-stream;1"].
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createInstance(Ci.nsIStringInputStream);
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inputStream.setData(aBody, aBody.length);
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let uploadChannel = this._channel.QueryInterface(Ci.nsIUploadChannel);
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uploadChannel.setUploadStream(inputStream, "text/plain", -1);
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let httpChannel = this._channel.QueryInterface(Ci.nsIHttpChannel);
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httpChannel.requestMethod = "POST";
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},
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// Parses the response body and eventually adds items to the |responses| array
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// for elements of |this._requests|.
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handleResponse: function HCR_handleResponse() {
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if (this._response == "") {
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return;
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}
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|
|
if (this.isV4) {
|
|
return this.handleResponseV4();
|
|
}
|
|
|
|
let start = 0;
|
|
|
|
let length = this._response.length;
|
|
while (start != length) {
|
|
start = this.handleTable(start);
|
|
}
|
|
},
|
|
|
|
handleResponseV4: function HCR_handleResponseV4() {
|
|
let callback = {
|
|
onCompleteHashFound : (aCompleteHash,
|
|
aTableNames,
|
|
aPerHashCacheDuration) => {
|
|
log("V4 fullhash response complete hash found callback: " +
|
|
JSON.stringify(aCompleteHash) + ", " +
|
|
aTableNames + ", CacheDuration(" + aPerHashCacheDuration + ")");
|
|
|
|
// Filter table names which we didn't requested.
|
|
let filteredTables = aTableNames.split(",").filter(name => {
|
|
return this.tableNames.get(name);
|
|
});
|
|
if (0 === filteredTables.length) {
|
|
log("ERROR: Got complete hash which is from unknown table.");
|
|
return;
|
|
}
|
|
if (filteredTables.length > 1) {
|
|
log("WARNING: Got complete hash which has ambigious threat type.");
|
|
}
|
|
|
|
this.handleItem(aCompleteHash, filteredTables[0], 0);
|
|
|
|
// TODO: Bug 1311935 - Implement v4 cache.
|
|
},
|
|
|
|
onResponseParsed : (aMinWaitDuration,
|
|
aNegCacheDuration) => {
|
|
log("V4 fullhash response parsed callback: " +
|
|
"MinWaitDuration(" + aMinWaitDuration + "), " +
|
|
"NegativeCacheDuration(" + aNegCacheDuration + ")");
|
|
|
|
// TODO: Bug 1311935 - Implement v4 cache.
|
|
},
|
|
};
|
|
|
|
gUrlUtil.parseFindFullHashResponseV4(this._response, callback);
|
|
},
|
|
|
|
// This parses a table entry in the response body and calls |handleItem|
|
|
// for complete hash in the table entry.
|
|
handleTable: function HCR_handleTable(aStart) {
|
|
let body = this._response.substring(aStart);
|
|
|
|
// deal with new line indexes as there could be
|
|
// new line characters in the data parts.
|
|
let newlineIndex = body.indexOf("\n");
|
|
if (newlineIndex == -1) {
|
|
throw errorWithStack();
|
|
}
|
|
let header = body.substring(0, newlineIndex);
|
|
let entries = header.split(":");
|
|
if (entries.length != 3) {
|
|
throw errorWithStack();
|
|
}
|
|
|
|
let list = entries[0];
|
|
let addChunk = parseInt(entries[1]);
|
|
let dataLength = parseInt(entries[2]);
|
|
|
|
log('Response includes add chunks for ' + list + ': ' + addChunk);
|
|
if (dataLength % COMPLETE_LENGTH != 0 ||
|
|
dataLength == 0 ||
|
|
dataLength > body.length - (newlineIndex + 1)) {
|
|
throw errorWithStack();
|
|
}
|
|
|
|
let data = body.substr(newlineIndex + 1, dataLength);
|
|
for (let i = 0; i < (dataLength / COMPLETE_LENGTH); i++) {
|
|
this.handleItem(data.substr(i * COMPLETE_LENGTH, COMPLETE_LENGTH), list,
|
|
addChunk);
|
|
}
|
|
|
|
return aStart + newlineIndex + 1 + dataLength;
|
|
},
|
|
|
|
// This adds a complete hash to any entry in |this._requests| that matches
|
|
// the hash.
|
|
handleItem: function HCR_handleItem(aData, aTableName, aChunkId) {
|
|
for (let i = 0; i < this._requests.length; i++) {
|
|
let request = this._requests[i];
|
|
if (aData.startsWith(request.partialHash)) {
|
|
request.responses.push({
|
|
completeHash: aData,
|
|
tableName: aTableName,
|
|
chunkId: aChunkId,
|
|
});
|
|
}
|
|
}
|
|
},
|
|
|
|
// notifySuccess and notifyFailure are used to alert the callbacks with
|
|
// results. notifySuccess makes |completion| and |completionFinished| calls
|
|
// while notifyFailure only makes a |completionFinished| call with the error
|
|
// code.
|
|
notifySuccess: function HCR_notifySuccess() {
|
|
for (let i = 0; i < this._requests.length; i++) {
|
|
let request = this._requests[i];
|
|
for (let j = 0; j < request.responses.length; j++) {
|
|
let response = request.responses[j];
|
|
request.callback.completion(response.completeHash, response.tableName,
|
|
response.chunkId);
|
|
}
|
|
|
|
request.callback.completionFinished(Cr.NS_OK);
|
|
}
|
|
},
|
|
|
|
notifyFailure: function HCR_notifyFailure(aStatus) {
|
|
log("notifying failure\n");
|
|
for (let i = 0; i < this._requests.length; i++) {
|
|
let request = this._requests[i];
|
|
request.callback.completionFinished(aStatus);
|
|
}
|
|
},
|
|
|
|
onDataAvailable: function HCR_onDataAvailable(aRequest, aContext,
|
|
aInputStream, aOffset, aCount) {
|
|
let sis = Cc["@mozilla.org/scriptableinputstream;1"].
|
|
createInstance(Ci.nsIScriptableInputStream);
|
|
sis.init(aInputStream);
|
|
this._response += sis.readBytes(aCount);
|
|
},
|
|
|
|
onStartRequest: function HCR_onStartRequest(aRequest, aContext) {
|
|
// At this point no data is available for us and we have no reason to
|
|
// terminate the connection, so we do nothing until |onStopRequest|.
|
|
},
|
|
|
|
onStopRequest: function HCR_onStopRequest(aRequest, aContext, aStatusCode) {
|
|
Services.obs.removeObserver(this, "quit-application");
|
|
|
|
if (this.timer_) {
|
|
this.timer_.cancel();
|
|
this.timer_ = null;
|
|
}
|
|
|
|
if (this._shuttingDown) {
|
|
throw Cr.NS_ERROR_ABORT;
|
|
}
|
|
|
|
// Default HTTP status to service unavailable, in case we can't retrieve
|
|
// the true status from the channel.
|
|
let httpStatus = 503;
|
|
if (Components.isSuccessCode(aStatusCode)) {
|
|
let channel = aRequest.QueryInterface(Ci.nsIHttpChannel);
|
|
let success = channel.requestSucceeded;
|
|
httpStatus = channel.responseStatus;
|
|
if (!success) {
|
|
aStatusCode = Cr.NS_ERROR_ABORT;
|
|
}
|
|
}
|
|
let success = Components.isSuccessCode(aStatusCode);
|
|
log('Received a ' + httpStatus + ' status code from the gethash server (success=' + success + ').');
|
|
|
|
Services.telemetry.getKeyedHistogramById("URLCLASSIFIER_COMPLETE_REMOTE_STATUS2").
|
|
add(this.telemetryProvider, httpStatusToBucket(httpStatus));
|
|
Services.telemetry.getKeyedHistogramById("URLCLASSIFIER_COMPLETE_TIMEOUT2").
|
|
add(this.telemetryProvider, 0);
|
|
|
|
// Notify the RequestBackoff once a response is received.
|
|
this._completer.finishRequest(this.gethashUrl, httpStatus);
|
|
|
|
if (success) {
|
|
try {
|
|
this.handleResponse();
|
|
}
|
|
catch (err) {
|
|
log(err.stack);
|
|
aStatusCode = err.value;
|
|
success = false;
|
|
}
|
|
}
|
|
|
|
if (success) {
|
|
this.notifySuccess();
|
|
} else {
|
|
this.notifyFailure(aStatusCode);
|
|
}
|
|
},
|
|
|
|
observe: function HCR_observe(aSubject, aTopic, aData) {
|
|
if (aTopic == "quit-application") {
|
|
this._shuttingDown = true;
|
|
if (this._channel) {
|
|
this._channel.cancel(Cr.NS_ERROR_ABORT);
|
|
}
|
|
|
|
Services.obs.removeObserver(this, "quit-application");
|
|
}
|
|
},
|
|
};
|
|
|
|
// Converts a URL safe base64 string to a normal base64 string. Will not change
|
|
// normal base64 strings. This is modelled after the same function in
|
|
// nsUrlClassifierUtils.h.
|
|
function unUrlsafeBase64(aStr) {
|
|
return !aStr ? "" : aStr.replace(/-/g, "+")
|
|
.replace(/_/g, "/");
|
|
}
|
|
|
|
function errorWithStack() {
|
|
let err = new Error();
|
|
err.value = Cr.NS_ERROR_FAILURE;
|
|
return err;
|
|
}
|
|
|
|
this.NSGetFactory = XPCOMUtils.generateNSGetFactory([HashCompleter]);
|