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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
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+/* 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/. */
+
+"use strict";
+
+/*
+ * HAWK is an HTTP authentication scheme using a message authentication code
+ * (MAC) algorithm to provide partial HTTP request cryptographic verification.
+ *
+ * For details, see: https://github.com/hueniverse/hawk
+ *
+ * With HAWK, it is essential that the clocks on clients and server not have an
+ * absolute delta of greater than one minute, as the HAWK protocol uses
+ * timestamps to reduce the possibility of replay attacks. However, it is
+ * likely that some clients' clocks will be more than a little off, especially
+ * in mobile devices, which would break HAWK-based services (like sync and
+ * firefox accounts) for those clients.
+ *
+ * This library provides a stateful HAWK client that calculates (roughly) the
+ * clock delta on the client vs the server. The library provides an interface
+ * for deriving HAWK credentials and making HAWK-authenticated REST requests to
+ * a single remote server. Therefore, callers who want to interact with
+ * multiple HAWK services should instantiate one HawkClient per service.
+ */
+
+this.EXPORTED_SYMBOLS = ["HawkClient"];
+
+var {interfaces: Ci, utils: Cu} = Components;
+
+Cu.import("resource://services-crypto/utils.js");
+Cu.import("resource://services-common/hawkrequest.js");
+Cu.import("resource://services-common/observers.js");
+Cu.import("resource://gre/modules/Promise.jsm");
+Cu.import("resource://gre/modules/Log.jsm");
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+Cu.import("resource://gre/modules/Services.jsm");
+
+// log.appender.dump should be one of "Fatal", "Error", "Warn", "Info", "Config",
+// "Debug", "Trace" or "All". If none is specified, "Error" will be used by
+// default.
+// Note however that Sync will also add this log to *its* DumpAppender, so
+// in a Sync context it shouldn't be necessary to adjust this - however, that
+// also means error logs are likely to be dump'd twice but that's OK.
+const PREF_LOG_LEVEL = "services.common.hawk.log.appender.dump";
+
+// A pref that can be set so "sensitive" information (eg, personally
+// identifiable info, credentials, etc) will be logged.
+const PREF_LOG_SENSITIVE_DETAILS = "services.common.hawk.log.sensitive";
+
+XPCOMUtils.defineLazyGetter(this, "log", function() {
+ let log = Log.repository.getLogger("Hawk");
+ // We set the log itself to "debug" and set the level from the preference to
+ // the appender. This allows other things to send the logs to different
+ // appenders, while still allowing the pref to control what is seen via dump()
+ log.level = Log.Level.Debug;
+ let appender = new Log.DumpAppender();
+ log.addAppender(appender);
+ appender.level = Log.Level.Error;
+ try {
+ let level =
+ Services.prefs.getPrefType(PREF_LOG_LEVEL) == Ci.nsIPrefBranch.PREF_STRING
+ && Services.prefs.getCharPref(PREF_LOG_LEVEL);
+ appender.level = Log.Level[level] || Log.Level.Error;
+ } catch (e) {
+ log.error(e);
+ }
+
+ return log;
+});
+
+// A boolean to indicate if personally identifiable information (or anything
+// else sensitive, such as credentials) should be logged.
+XPCOMUtils.defineLazyGetter(this, 'logPII', function() {
+ try {
+ return Services.prefs.getBoolPref(PREF_LOG_SENSITIVE_DETAILS);
+ } catch (_) {
+ return false;
+ }
+});
+
+/*
+ * A general purpose client for making HAWK authenticated requests to a single
+ * host. Keeps track of the clock offset between the client and the host for
+ * computation of the timestamp in the HAWK Authorization header.
+ *
+ * Clients should create one HawkClient object per each server they wish to
+ * interact with.
+ *
+ * @param host
+ * The url of the host
+ */
+this.HawkClient = function(host) {
+ this.host = host;
+
+ // Clock offset in milliseconds between our client's clock and the date
+ // reported in responses from our host.
+ this._localtimeOffsetMsec = 0;
+}
+
+this.HawkClient.prototype = {
+
+ /*
+ * A boolean for feature detection.
+ */
+ willUTF8EncodeRequests: HAWKAuthenticatedRESTRequest.prototype.willUTF8EncodeObjectRequests,
+
+ /*
+ * Construct an error message for a response. Private.
+ *
+ * @param restResponse
+ * A RESTResponse object from a RESTRequest
+ *
+ * @param error
+ * A string or object describing the error
+ */
+ _constructError: function(restResponse, error) {
+ let errorObj = {
+ error: error,
+ // This object is likely to be JSON.stringify'd, but neither Error()
+ // objects nor Components.Exception objects do the right thing there,
+ // so we add a new element which is simply the .toString() version of
+ // the error object, so it does appear in JSON'd values.
+ errorString: error.toString(),
+ message: restResponse.statusText,
+ code: restResponse.status,
+ errno: restResponse.status,
+ toString() {
+ return this.code + ": " + this.message;
+ },
+ };
+ let retryAfter = restResponse.headers && restResponse.headers["retry-after"];
+ retryAfter = retryAfter ? parseInt(retryAfter) : retryAfter;
+ if (retryAfter) {
+ errorObj.retryAfter = retryAfter;
+ // and notify observers of the retry interval
+ if (this.observerPrefix) {
+ Observers.notify(this.observerPrefix + ":backoff:interval", retryAfter);
+ }
+ }
+ return errorObj;
+ },
+
+ /*
+ *
+ * Update clock offset by determining difference from date gives in the (RFC
+ * 1123) Date header of a server response. Because HAWK tolerates a window
+ * of one minute of clock skew (so two minutes total since the skew can be
+ * positive or negative), the simple method of calculating offset here is
+ * probably good enough. We keep the value in milliseconds to make life
+ * easier, even though the value will not have millisecond accuracy.
+ *
+ * @param dateString
+ * An RFC 1123 date string (e.g., "Mon, 13 Jan 2014 21:45:06 GMT")
+ *
+ * For HAWK clock skew and replay protection, see
+ * https://github.com/hueniverse/hawk#replay-protection
+ */
+ _updateClockOffset: function(dateString) {
+ try {
+ let serverDateMsec = Date.parse(dateString);
+ this._localtimeOffsetMsec = serverDateMsec - this.now();
+ log.debug("Clock offset vs " + this.host + ": " + this._localtimeOffsetMsec);
+ } catch(err) {
+ log.warn("Bad date header in server response: " + dateString);
+ }
+ },
+
+ /*
+ * Get the current clock offset in milliseconds.
+ *
+ * The offset is the number of milliseconds that must be added to the client
+ * clock to make it equal to the server clock. For example, if the client is
+ * five minutes ahead of the server, the localtimeOffsetMsec will be -300000.
+ */
+ get localtimeOffsetMsec() {
+ return this._localtimeOffsetMsec;
+ },
+
+ /*
+ * return current time in milliseconds
+ */
+ now: function() {
+ return Date.now();
+ },
+
+ /* A general method for sending raw RESTRequest calls authorized using HAWK
+ *
+ * @param path
+ * API endpoint path
+ * @param method
+ * The HTTP request method
+ * @param credentials
+ * Hawk credentials
+ * @param payloadObj
+ * An object that can be encodable as JSON as the payload of the
+ * request
+ * @param extraHeaders
+ * An object with header/value pairs to send with the request.
+ * @return Promise
+ * Returns a promise that resolves to the response of the API call,
+ * or is rejected with an error. If the server response can be parsed
+ * as JSON and contains an 'error' property, the promise will be
+ * rejected with this JSON-parsed response.
+ */
+ request: function(path, method, credentials=null, payloadObj={}, extraHeaders = {},
+ retryOK=true) {
+ method = method.toLowerCase();
+
+ let deferred = Promise.defer();
+ let uri = this.host + path;
+ let self = this;
+
+ function _onComplete(error) {
+ // |error| can be either a normal caught error or an explicitly created
+ // Components.Exception() error. Log it now as it might not end up
+ // correctly in the logs by the time it's passed through _constructError.
+ if (error) {
+ log.warn("hawk request error", error);
+ }
+ // If there's no response there's nothing else to do.
+ if (!this.response) {
+ deferred.reject(error);
+ return;
+ }
+ let restResponse = this.response;
+ let status = restResponse.status;
+
+ log.debug("(Response) " + path + ": code: " + status +
+ " - Status text: " + restResponse.statusText);
+ if (logPII) {
+ log.debug("Response text: " + restResponse.body);
+ }
+
+ // All responses may have backoff headers, which are a server-side safety
+ // valve to allow slowing down clients without hurting performance.
+ self._maybeNotifyBackoff(restResponse, "x-weave-backoff");
+ self._maybeNotifyBackoff(restResponse, "x-backoff");
+
+ if (error) {
+ // When things really blow up, reconstruct an error object that follows
+ // the general format of the server on error responses.
+ return deferred.reject(self._constructError(restResponse, error));
+ }
+
+ self._updateClockOffset(restResponse.headers["date"]);
+
+ if (status === 401 && retryOK && !("retry-after" in restResponse.headers)) {
+ // Retry once if we were rejected due to a bad timestamp.
+ // Clock offset is adjusted already in the top of this function.
+ log.debug("Received 401 for " + path + ": retrying");
+ return deferred.resolve(
+ self.request(path, method, credentials, payloadObj, extraHeaders, false));
+ }
+
+ // If the server returned a json error message, use it in the rejection
+ // of the promise.
+ //
+ // In the case of a 401, in which we are probably being rejected for a
+ // bad timestamp, retry exactly once, during which time clock offset will
+ // be adjusted.
+
+ let jsonResponse = {};
+ try {
+ jsonResponse = JSON.parse(restResponse.body);
+ } catch(notJSON) {}
+
+ let okResponse = (200 <= status && status < 300);
+ if (!okResponse || jsonResponse.error) {
+ if (jsonResponse.error) {
+ return deferred.reject(jsonResponse);
+ }
+ return deferred.reject(self._constructError(restResponse, "Request failed"));
+ }
+ // It's up to the caller to know how to decode the response.
+ // We just return the whole response.
+ deferred.resolve(this.response);
+ };
+
+ function onComplete(error) {
+ try {
+ // |this| is the RESTRequest object and we need to ensure _onComplete
+ // gets the same one.
+ _onComplete.call(this, error);
+ } catch (ex) {
+ log.error("Unhandled exception processing response", ex);
+ deferred.reject(ex);
+ }
+ }
+
+ let extra = {
+ now: this.now(),
+ localtimeOffsetMsec: this.localtimeOffsetMsec,
+ headers: extraHeaders
+ };
+
+ let request = this.newHAWKAuthenticatedRESTRequest(uri, credentials, extra);
+ try {
+ if (method == "post" || method == "put" || method == "patch") {
+ request[method](payloadObj, onComplete);
+ } else {
+ request[method](onComplete);
+ }
+ } catch (ex) {
+ log.error("Failed to make hawk request", ex);
+ deferred.reject(ex);
+ }
+
+ return deferred.promise;
+ },
+
+ /*
+ * The prefix used for all notifications sent by this module. This
+ * allows the handler of notifications to be sure they are handling
+ * notifications for the service they expect.
+ *
+ * If not set, no notifications will be sent.
+ */
+ observerPrefix: null,
+
+ // Given an optional header value, notify that a backoff has been requested.
+ _maybeNotifyBackoff: function (response, headerName) {
+ if (!this.observerPrefix || !response.headers) {
+ return;
+ }
+ let headerVal = response.headers[headerName];
+ if (!headerVal) {
+ return;
+ }
+ let backoffInterval;
+ try {
+ backoffInterval = parseInt(headerVal, 10);
+ } catch (ex) {
+ log.error("hawkclient response had invalid backoff value in '" +
+ headerName + "' header: " + headerVal);
+ return;
+ }
+ Observers.notify(this.observerPrefix + ":backoff:interval", backoffInterval);
+ },
+
+ // override points for testing.
+ newHAWKAuthenticatedRESTRequest: function(uri, credentials, extra) {
+ return new HAWKAuthenticatedRESTRequest(uri, credentials, extra);
+ },
+
+}