DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Mercurial (2bee7577b5a6)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522
/* 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/. */

/**
 * The AddonUpdateChecker is responsible for retrieving the update information
 * from an add-on's remote update manifest.
 */

"use strict";

var EXPORTED_SYMBOLS = [ "AddonUpdateChecker" ];

const TIMEOUT               = 60 * 1000;
const TOOLKIT_ID            = "toolkit@mozilla.org";

const PREF_UPDATE_REQUIREBUILTINCERTS = "extensions.update.requireBuiltInCerts";

const {Services} = ChromeUtils.import("resource://gre/modules/Services.jsm");

ChromeUtils.defineModuleGetter(this, "AddonManager",
                               "resource://gre/modules/AddonManager.jsm");
ChromeUtils.defineModuleGetter(this, "AddonManagerPrivate",
                               "resource://gre/modules/AddonManager.jsm");
ChromeUtils.defineModuleGetter(this, "AddonRepository",
                               "resource://gre/modules/addons/AddonRepository.jsm");
ChromeUtils.defineModuleGetter(this, "Blocklist",
                               "resource://gre/modules/Blocklist.jsm");
ChromeUtils.defineModuleGetter(this, "CertUtils",
                               "resource://gre/modules/CertUtils.jsm");
ChromeUtils.defineModuleGetter(this, "ServiceRequest",
                               "resource://gre/modules/ServiceRequest.jsm");

const {Log} = ChromeUtils.import("resource://gre/modules/Log.jsm");
const LOGGER_ID = "addons.update-checker";

// Create a new logger for use by the Addons Update Checker
// (Requires AddonManager.jsm)
var logger = Log.repository.getLogger(LOGGER_ID);

const updateTypeHistogram = Services.telemetry.getHistogramById("EXTENSION_UPDATE_TYPE");

/**
 * Sanitizes the update URL in an update item, as returned by
 * parseRDFManifest and parseJSONManifest. Ensures that:
 *
 * - The URL is secure, or secured by a strong enough hash.
 * - The security principal of the update manifest has permission to
 *   load the URL.
 *
 * @param aUpdate
 *        The update item to sanitize.
 * @param aRequest
 *        The XMLHttpRequest used to load the manifest.
 * @param aHashPattern
 *        The regular expression used to validate the update hash.
 * @param aHashString
 *        The human-readable string specifying which hash functions
 *        are accepted.
 */
function sanitizeUpdateURL(aUpdate, aRequest, aHashPattern, aHashString) {
  if (aUpdate.updateURL) {
    let scriptSecurity = Services.scriptSecurityManager;
    let principal = scriptSecurity.getChannelURIPrincipal(aRequest.channel);
    try {
      // This logs an error on failure, so no need to log it a second time
      scriptSecurity.checkLoadURIStrWithPrincipal(principal, aUpdate.updateURL,
                                                  scriptSecurity.DISALLOW_SCRIPT);
    } catch (e) {
      delete aUpdate.updateURL;
      return;
    }

    if (AddonManager.checkUpdateSecurity &&
        !aUpdate.updateURL.startsWith("https:") &&
        !aHashPattern.test(aUpdate.updateHash)) {
      logger.warn(`Update link ${aUpdate.updateURL} is not secure and is not verified ` +
                  `by a strong enough hash (needs to be ${aHashString}).`);
      delete aUpdate.updateURL;
      delete aUpdate.updateHash;
    }
  }
}

/**
 * Parses an JSON update manifest into an array of update objects.
 *
 * @param  aId
 *         The ID of the add-on being checked for updates
 * @param  aRequest
 *         The XMLHttpRequest that has retrieved the update manifest
 * @param  aManifestData
 *         The pre-parsed manifest, as a JSON object tree
 * @return an array of update objects
 * @throws if the update manifest is invalid in any way
 */
function parseJSONManifest(aId, aRequest, aManifestData) {
  let TYPE_CHECK = {
    "array": val => Array.isArray(val),
    "object": val => val && typeof val == "object" && !Array.isArray(val),
  };

  function getProperty(aObj, aProperty, aType, aDefault = undefined) {
    if (!(aProperty in aObj))
      return aDefault;

    let value = aObj[aProperty];

    let matchesType = aType in TYPE_CHECK ? TYPE_CHECK[aType](value) : typeof value == aType;
    if (!matchesType)
      throw Components.Exception(`Update manifest property '${aProperty}' has incorrect type (expected ${aType})`);

    return value;
  }

  function getRequiredProperty(aObj, aProperty, aType) {
    let value = getProperty(aObj, aProperty, aType);
    if (value === undefined)
      throw Components.Exception(`Update manifest is missing a required ${aProperty} property.`);
    return value;
  }

  let manifest = aManifestData;

  if (!TYPE_CHECK.object(manifest))
    throw Components.Exception("Root element of update manifest must be a JSON object literal");

  // The set of add-ons this manifest has updates for
  let addons = getRequiredProperty(manifest, "addons", "object");

  // The entry for this particular add-on
  let addon = getProperty(addons, aId, "object");

  // A missing entry doesn't count as a failure, just as no avialable update
  // information
  if (!addon) {
    logger.warn("Update manifest did not contain an entry for " + aId);
    return [];
  }

  // The list of available updates
  let updates = getProperty(addon, "updates", "array", []);

  let results = [];

  for (let update of updates) {
    let version = getRequiredProperty(update, "version", "string");

    logger.debug(`Found an update entry for ${aId} version ${version}`);

    let applications = getProperty(update, "applications", "object",
                                   { gecko: {} });

    // "gecko" is currently the only supported application entry. If
    // it's missing, skip this update.
    if (!("gecko" in applications)) {
      logger.debug("gecko not in application entry, skipping update of ${addon}");
      continue;
    }

    let app = getProperty(applications, "gecko", "object");

    let appEntry = {
      id: TOOLKIT_ID,
      minVersion: getProperty(app, "strict_min_version", "string",
                              AddonManagerPrivate.webExtensionsMinPlatformVersion),
      maxVersion: "*",
    };

    let result = {
      id: aId,
      version,
      updateURL: getProperty(update, "update_link", "string"),
      updateHash: getProperty(update, "update_hash", "string"),
      updateInfoURL: getProperty(update, "update_info_url", "string"),
      strictCompatibility: false,
      targetApplications: [appEntry],
    };

    if ("strict_max_version" in app) {
      if ("advisory_max_version" in app) {
        logger.warn("Ignoring 'advisory_max_version' update manifest property for " +
                    aId + " property since 'strict_max_version' also present");
      }

      appEntry.maxVersion = getProperty(app, "strict_max_version", "string");
      result.strictCompatibility = appEntry.maxVersion != "*";
    } else if ("advisory_max_version" in app) {
      appEntry.maxVersion = getProperty(app, "advisory_max_version", "string");
    }

    // Add an app entry for the current API ID, too, so that it overrides any
    // existing app-specific entries, which would take priority over the toolkit
    // entry.
    //
    // Note: This currently only has any effect on legacy extensions (mainly
    // those used in tests), since WebExtensions cannot yet specify app-specific
    // compatibility ranges.
    result.targetApplications.push(Object.assign({}, appEntry,
                                                 {id: Services.appinfo.ID}));

    // The JSON update protocol requires an SHA-2 hash. RDF still
    // supports SHA-1, for compatibility reasons.
    sanitizeUpdateURL(result, aRequest, /^sha(256|512):/, "sha256 or sha512");

    results.push(result);
  }
  return results;
}

/**
 * Starts downloading an update manifest and then passes it to an appropriate
 * parser to convert to an array of update objects
 *
 * @param  aId
 *         The ID of the add-on being checked for updates
 * @param  aUrl
 *         The URL of the update manifest
 * @param  aObserver
 *         An observer to pass results to
 */
function UpdateParser(aId, aUrl, aObserver) {
  this.id = aId;
  this.observer = aObserver;
  this.url = aUrl;

  let requireBuiltIn = Services.prefs.getBoolPref(PREF_UPDATE_REQUIREBUILTINCERTS, true);

  logger.debug("Requesting " + aUrl);
  try {
    this.request = new ServiceRequest({mozAnon: true});
    this.request.open("GET", this.url, true);
    this.request.channel.notificationCallbacks = new CertUtils.BadCertHandler(!requireBuiltIn);
    this.request.channel.loadFlags |= Ci.nsIRequest.LOAD_BYPASS_CACHE;
    // Prevent the request from writing to cache.
    this.request.channel.loadFlags |= Ci.nsIRequest.INHIBIT_CACHING;
    this.request.overrideMimeType("text/plain");
    this.request.timeout = TIMEOUT;
    this.request.addEventListener("load", () => this.onLoad());
    this.request.addEventListener("error", () => this.onError());
    this.request.addEventListener("timeout", () => this.onTimeout());
    this.request.send(null);
  } catch (e) {
    logger.error("Failed to request update manifest", e);
  }
}

UpdateParser.prototype = {
  id: null,
  observer: null,
  request: null,
  url: null,

  /**
   * Called when the manifest has been successfully loaded.
   */
  onLoad() {
    let request = this.request;
    this.request = null;
    this._doneAt = new Error("place holder");

    let requireBuiltIn = Services.prefs.getBoolPref(PREF_UPDATE_REQUIREBUILTINCERTS, true);

    try {
      CertUtils.checkCert(request.channel, !requireBuiltIn);
    } catch (e) {
      logger.warn("Request failed: " + this.url + " - " + e);
      this.notifyError(AddonManager.ERROR_DOWNLOAD_ERROR);
      return;
    }

    if (!Components.isSuccessCode(request.status)) {
      logger.warn("Request failed: " + this.url + " - " + request.status);
      this.notifyError(AddonManager.ERROR_DOWNLOAD_ERROR);
      return;
    }

    let channel = request.channel;
    if (channel instanceof Ci.nsIHttpChannel && !channel.requestSucceeded) {
      logger.warn("Request failed: " + this.url + " - " + channel.responseStatus +
           ": " + channel.responseStatusText);
      this.notifyError(AddonManager.ERROR_DOWNLOAD_ERROR);
      return;
    }

    let results;
    try {
      let json = JSON.parse(request.responseText);
      results = parseJSONManifest(this.id, request, json);
      updateTypeHistogram.add("JSON");
    } catch (e) {
      logger.warn("onUpdateCheckComplete failed to parse update manifest", e);
      this.notifyError(AddonManager.ERROR_PARSE_ERROR);
      return;
    }

    if ("onUpdateCheckComplete" in this.observer) {
      try {
        this.observer.onUpdateCheckComplete(results);
      } catch (e) {
        logger.warn("onUpdateCheckComplete notification failed", e);
      }
    } else {
      logger.warn("onUpdateCheckComplete may not properly cancel", new Error("stack marker"));
    }
  },

  /**
   * Called when the request times out
   */
  onTimeout() {
    this.request = null;
    this._doneAt = new Error("Timed out");
    logger.warn("Request for " + this.url + " timed out");
    this.notifyError(AddonManager.ERROR_TIMEOUT);
  },

  /**
   * Called when the manifest failed to load.
   */
  onError() {
    if (!Components.isSuccessCode(this.request.status)) {
      logger.warn("Request failed: " + this.url + " - " + this.request.status);
    } else if (this.request.channel instanceof Ci.nsIHttpChannel) {
      try {
        if (this.request.channel.requestSucceeded) {
          logger.warn("Request failed: " + this.url + " - " +
               this.request.channel.responseStatus + ": " +
               this.request.channel.responseStatusText);
        }
      } catch (e) {
        logger.warn("HTTP Request failed for an unknown reason");
      }
    } else {
      logger.warn("Request failed for an unknown reason");
    }

    this.request = null;
    this._doneAt = new Error("UP_onError");

    this.notifyError(AddonManager.ERROR_DOWNLOAD_ERROR);
  },

  /**
   * Helper method to notify the observer that an error occurred.
   */
  notifyError(aStatus) {
    if ("onUpdateCheckError" in this.observer) {
      try {
        this.observer.onUpdateCheckError(aStatus);
      } catch (e) {
        logger.warn("onUpdateCheckError notification failed", e);
      }
    }
  },

  /**
   * Called to cancel an in-progress update check.
   */
  cancel() {
    if (!this.request) {
      logger.error("Trying to cancel already-complete request", this._doneAt);
      return;
    }
    this.request.abort();
    this.request = null;
    this._doneAt = new Error("UP_cancel");
    this.notifyError(AddonManager.ERROR_CANCELLED);
  },
};

/**
 * Tests if an update matches a version of the application or platform
 *
 * @param  aUpdate
 *         The available update
 * @param  aAppVersion
 *         The application version to use
 * @param  aPlatformVersion
 *         The platform version to use
 * @param  aIgnoreMaxVersion
 *         Ignore maxVersion when testing if an update matches. Optional.
 * @param  aIgnoreStrictCompat
 *         Ignore strictCompatibility when testing if an update matches. Optional.
 * @param  aCompatOverrides
 *         AddonCompatibilityOverride objects to match against. Optional.
 * @return true if the update is compatible with the application/platform
 */
function matchesVersions(aUpdate, aAppVersion, aPlatformVersion,
                         aIgnoreMaxVersion, aIgnoreStrictCompat,
                         aCompatOverrides) {
  if (aCompatOverrides) {
    let override = AddonRepository.findMatchingCompatOverride(aUpdate.version,
                                                              aCompatOverrides,
                                                              aAppVersion,
                                                              aPlatformVersion);
    if (override && override.type == "incompatible")
      return false;
  }

  if (aUpdate.strictCompatibility && !aIgnoreStrictCompat)
    aIgnoreMaxVersion = false;

  let result = false;
  for (let app of aUpdate.targetApplications) {
    if (app.id == Services.appinfo.ID) {
      return (Services.vc.compare(aAppVersion, app.minVersion) >= 0) &&
             (aIgnoreMaxVersion || (Services.vc.compare(aAppVersion, app.maxVersion) <= 0));
    }
    if (app.id == TOOLKIT_ID) {
      result = (Services.vc.compare(aPlatformVersion, app.minVersion) >= 0) &&
               (aIgnoreMaxVersion || (Services.vc.compare(aPlatformVersion, app.maxVersion) <= 0));
    }
  }
  return result;
}

var AddonUpdateChecker = {
  /**
   * Retrieves the best matching compatibility update for the application from
   * a list of available update objects.
   *
   * @param  aUpdates
   *         An array of update objects
   * @param  aVersion
   *         The version of the add-on to get new compatibility information for
   * @param  aIgnoreCompatibility
   *         An optional parameter to get the first compatibility update that
   *         is compatible with any version of the application or toolkit
   * @param  aAppVersion
   *         The version of the application or null to use the current version
   * @param  aPlatformVersion
   *         The version of the platform or null to use the current version
   * @param  aIgnoreMaxVersion
   *         Ignore maxVersion when testing if an update matches. Optional.
   * @param  aIgnoreStrictCompat
   *         Ignore strictCompatibility when testing if an update matches. Optional.
   * @return an update object if one matches or null if not
   */
  getCompatibilityUpdate(aUpdates, aVersion, aIgnoreCompatibility,
                                   aAppVersion, aPlatformVersion,
                                   aIgnoreMaxVersion, aIgnoreStrictCompat) {
    if (!aAppVersion)
      aAppVersion = Services.appinfo.version;
    if (!aPlatformVersion)
      aPlatformVersion = Services.appinfo.platformVersion;

    for (let update of aUpdates) {
      if (Services.vc.compare(update.version, aVersion) == 0) {
        if (aIgnoreCompatibility) {
          for (let targetApp of update.targetApplications) {
            let id = targetApp.id;
            if (id == Services.appinfo.ID || id == TOOLKIT_ID)
              return update;
          }
        } else if (matchesVersions(update, aAppVersion, aPlatformVersion,
                                 aIgnoreMaxVersion, aIgnoreStrictCompat)) {
          return update;
        }
      }
    }
    return null;
  },

  /**
   * Asynchronously returns the newest available update from a list of update objects.
   *
   * @param  aUpdates
   *         An array of update objects
   * @param  aAppVersion
   *         The version of the application or null to use the current version
   * @param  aPlatformVersion
   *         The version of the platform or null to use the current version
   * @param  aIgnoreMaxVersion
   *         When determining compatible updates, ignore maxVersion. Optional.
   * @param  aIgnoreStrictCompat
   *         When determining compatible updates, ignore strictCompatibility. Optional.
   * @param  aCompatOverrides
   *         Array of AddonCompatibilityOverride to take into account. Optional.
   * @return an update object if one matches or null if not
   */
  async getNewestCompatibleUpdate(aUpdates, aAppVersion, aPlatformVersion,
                                  aIgnoreMaxVersion, aIgnoreStrictCompat,
                                  aCompatOverrides) {
    if (!aAppVersion)
      aAppVersion = Services.appinfo.version;
    if (!aPlatformVersion)
      aPlatformVersion = Services.appinfo.platformVersion;

    let newest = null;
    for (let update of aUpdates) {
      if (!update.updateURL)
        continue;
      let state = await Blocklist.getAddonBlocklistState(update, aAppVersion, aPlatformVersion);
      if (state != Ci.nsIBlocklistService.STATE_NOT_BLOCKED)
        continue;
      if ((newest == null || (Services.vc.compare(newest.version, update.version) < 0)) &&
          matchesVersions(update, aAppVersion, aPlatformVersion,
                          aIgnoreMaxVersion, aIgnoreStrictCompat,
                          aCompatOverrides)) {
        newest = update;
      }
    }
    return newest;
  },

  /**
   * Starts an update check.
   *
   * @param  aId
   *         The ID of the add-on being checked for updates
   * @param  aUrl
   *         The URL of the add-on's update manifest
   * @param  aObserver
   *         An observer to notify of results
   * @return UpdateParser so that the caller can use UpdateParser.cancel() to shut
   *         down in-progress update requests
   */
  checkForUpdates(aId, aUrl, aObserver) {
    return new UpdateParser(aId, aUrl, aObserver);
  },
};