651 lines
20 KiB
JavaScript
651 lines
20 KiB
JavaScript
// Copyright 2014-2015 Google Inc. All rights reserved.
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//
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file or at
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// https://developers.google.com/open-source/licenses/bsd
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/**
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* @fileoverview The U2F api.
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*/
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'use strict';
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/** Namespace for the U2F api.
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* @type {Object}
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*/
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var u2f = u2f || {};
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/**
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* The U2F extension id
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* @type {string}
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* @const
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*/
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u2f.EXTENSION_ID = 'kmendfapggjehodndflmmgagdbamhnfd';
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/**
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* Message types for messsages to/from the extension
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* @const
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* @enum {string}
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*/
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u2f.MessageTypes = {
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'U2F_REGISTER_REQUEST': 'u2f_register_request',
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'U2F_SIGN_REQUEST': 'u2f_sign_request',
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'U2F_REGISTER_RESPONSE': 'u2f_register_response',
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'U2F_SIGN_RESPONSE': 'u2f_sign_response'
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};
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/**
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* Response status codes
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* @const
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* @enum {number}
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*/
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u2f.ErrorCodes = {
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'OK': 0,
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'OTHER_ERROR': 1,
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'BAD_REQUEST': 2,
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'CONFIGURATION_UNSUPPORTED': 3,
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'DEVICE_INELIGIBLE': 4,
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'TIMEOUT': 5
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};
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/**
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* A message type for registration requests
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* @typedef {{
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* type: u2f.MessageTypes,
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* signRequests: Array<u2f.SignRequest>,
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* registerRequests: ?Array<u2f.RegisterRequest>,
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* timeoutSeconds: ?number,
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* requestId: ?number
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* }}
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*/
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u2f.Request;
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/**
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* A message for registration responses
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* @typedef {{
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* type: u2f.MessageTypes,
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* responseData: (u2f.Error | u2f.RegisterResponse | u2f.SignResponse),
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* requestId: ?number
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* }}
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*/
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u2f.Response;
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/**
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* An error object for responses
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* @typedef {{
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* errorCode: u2f.ErrorCodes,
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* errorMessage: ?string
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* }}
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*/
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u2f.Error;
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/**
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* Data object for a single sign request.
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* @typedef {{
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* version: string,
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* challenge: string,
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* keyHandle: string,
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* appId: string
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* }}
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*/
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u2f.SignRequest;
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/**
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* Data object for a sign response.
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* @typedef {{
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* keyHandle: string,
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* signatureData: string,
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* clientData: string
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* }}
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*/
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u2f.SignResponse;
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/**
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* Data object for a registration request.
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* @typedef {{
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* version: string,
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* challenge: string,
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* appId: string
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* }}
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*/
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u2f.RegisterRequest;
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/**
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* Data object for a registration response.
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* @typedef {{
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* registrationData: string,
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* clientData: string
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* }}
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*/
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u2f.RegisterResponse;
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// Low level MessagePort API support
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/**
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* Sets up a MessagePort to the U2F extension using the
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* available mechanisms.
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* @param {function((MessagePort|u2f.WrappedChromeRuntimePort_))} callback
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*/
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u2f.getMessagePort = function(callback) {
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if (typeof chrome != 'undefined' && chrome.runtime) {
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// The actual message here does not matter, but we need to get a reply
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// for the callback to run. Thus, send an empty signature request
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// in order to get a failure response.
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var msg = {
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type: u2f.MessageTypes.U2F_SIGN_REQUEST,
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signRequests: []
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};
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chrome.runtime.sendMessage(u2f.EXTENSION_ID, msg, function() {
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if (!chrome.runtime.lastError) {
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// We are on a whitelisted origin and can talk directly
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// with the extension.
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u2f.getChromeRuntimePort_(callback);
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} else {
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// chrome.runtime was available, but we couldn't message
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// the extension directly, use iframe
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u2f.getIframePort_(callback);
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}
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});
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} else if (u2f.isAndroidChrome_()) {
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u2f.getAuthenticatorPort_(callback);
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} else {
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// chrome.runtime was not available at all, which is normal
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// when this origin doesn't have access to any extensions.
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u2f.getIframePort_(callback);
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}
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};
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/**
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* Detect chrome running on android based on the browser's useragent.
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* @private
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*/
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u2f.isAndroidChrome_ = function() {
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var userAgent = navigator.userAgent;
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return userAgent.indexOf('Chrome') != -1 &&
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userAgent.indexOf('Android') != -1;
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};
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/**
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* Connects directly to the extension via chrome.runtime.connect
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* @param {function(u2f.WrappedChromeRuntimePort_)} callback
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* @private
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*/
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u2f.getChromeRuntimePort_ = function(callback) {
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var port = chrome.runtime.connect(u2f.EXTENSION_ID,
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{'includeTlsChannelId': true});
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setTimeout(function() {
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callback(new u2f.WrappedChromeRuntimePort_(port));
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}, 0);
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};
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/**
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* Return a 'port' abstraction to the Authenticator app.
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* @param {function(u2f.WrappedAuthenticatorPort_)} callback
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* @private
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*/
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u2f.getAuthenticatorPort_ = function(callback) {
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setTimeout(function() {
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callback(new u2f.WrappedAuthenticatorPort_());
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}, 0);
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};
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/**
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* A wrapper for chrome.runtime.Port that is compatible with MessagePort.
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* @param {Port} port
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* @constructor
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* @private
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*/
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u2f.WrappedChromeRuntimePort_ = function(port) {
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this.port_ = port;
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};
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/**
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* Format a return a sign request.
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* @param {Array<u2f.SignRequest>} signRequests
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* @param {number} timeoutSeconds
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* @param {number} reqId
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* @return {Object}
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*/
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u2f.WrappedChromeRuntimePort_.prototype.formatSignRequest_ =
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function(signRequests, timeoutSeconds, reqId) {
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return {
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type: u2f.MessageTypes.U2F_SIGN_REQUEST,
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signRequests: signRequests,
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timeoutSeconds: timeoutSeconds,
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requestId: reqId
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};
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};
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/**
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* Format a return a register request.
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* @param {Array<u2f.SignRequest>} signRequests
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* @param {Array<u2f.RegisterRequest>} signRequests
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* @param {number} timeoutSeconds
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* @param {number} reqId
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* @return {Object}
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*/
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u2f.WrappedChromeRuntimePort_.prototype.formatRegisterRequest_ =
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function(signRequests, registerRequests, timeoutSeconds, reqId) {
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return {
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type: u2f.MessageTypes.U2F_REGISTER_REQUEST,
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signRequests: signRequests,
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registerRequests: registerRequests,
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timeoutSeconds: timeoutSeconds,
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requestId: reqId
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};
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};
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/**
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* Posts a message on the underlying channel.
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* @param {Object} message
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*/
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u2f.WrappedChromeRuntimePort_.prototype.postMessage = function(message) {
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this.port_.postMessage(message);
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};
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/**
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* Emulates the HTML 5 addEventListener interface. Works only for the
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* onmessage event, which is hooked up to the chrome.runtime.Port.onMessage.
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* @param {string} eventName
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* @param {function({data: Object})} handler
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*/
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u2f.WrappedChromeRuntimePort_.prototype.addEventListener =
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function(eventName, handler) {
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var name = eventName.toLowerCase();
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if (name == 'message' || name == 'onmessage') {
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this.port_.onMessage.addListener(function(message) {
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// Emulate a minimal MessageEvent object
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handler({'data': message});
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});
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} else {
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console.error('WrappedChromeRuntimePort only supports onMessage');
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}
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};
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/**
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* Wrap the Authenticator app with a MessagePort interface.
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* @constructor
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* @private
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*/
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u2f.WrappedAuthenticatorPort_ = function() {
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this.requestId_ = -1;
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this.requestObject_ = null;
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}
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/**
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* Launch the Authenticator intent.
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* @param {Object} message
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*/
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u2f.WrappedAuthenticatorPort_.prototype.postMessage = function(message) {
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var intentLocation = /** @type {string} */ (message);
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document.location = intentLocation;
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};
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/**
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* Emulates the HTML 5 addEventListener interface.
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* @param {string} eventName
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* @param {function({data: Object})} handler
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*/
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u2f.WrappedAuthenticatorPort_.prototype.addEventListener =
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function(eventName, handler) {
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var name = eventName.toLowerCase();
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if (name == 'message') {
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var self = this;
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/* Register a callback to that executes when
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* chrome injects the response. */
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window.addEventListener(
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'message', self.onRequestUpdate_.bind(self, handler), false);
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} else {
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console.error('WrappedAuthenticatorPort only supports message');
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}
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};
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/**
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* Callback invoked when a response is received from the Authenticator.
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* @param function({data: Object}) callback
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* @param {Object} message message Object
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*/
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u2f.WrappedAuthenticatorPort_.prototype.onRequestUpdate_ =
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function(callback, message) {
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var messageObject = JSON.parse(message.data);
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var intentUrl = messageObject['intentURL'];
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var errorCode = messageObject['errorCode'];
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var responseObject = null;
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if (messageObject.hasOwnProperty('data')) {
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responseObject = /** @type {Object} */ (
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JSON.parse(messageObject['data']));
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responseObject['requestId'] = this.requestId_;
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}
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/* Sign responses from the authenticator do not conform to U2F,
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* convert to U2F here. */
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responseObject = this.doResponseFixups_(responseObject);
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callback({'data': responseObject});
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};
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/**
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* Fixup the response provided by the Authenticator to conform with
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* the U2F spec.
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* @param {Object} responseData
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* @return {Object} the U2F compliant response object
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*/
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u2f.WrappedAuthenticatorPort_.prototype.doResponseFixups_ =
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function(responseObject) {
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if (responseObject.hasOwnProperty('responseData')) {
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return responseObject;
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} else if (this.requestObject_['type'] != u2f.MessageTypes.U2F_SIGN_REQUEST) {
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// Only sign responses require fixups. If this is not a response
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// to a sign request, then an internal error has occurred.
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return {
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'type': u2f.MessageTypes.U2F_REGISTER_RESPONSE,
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'responseData': {
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'errorCode': u2f.ErrorCodes.OTHER_ERROR,
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'errorMessage': 'Internal error: invalid response from Authenticator'
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}
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};
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}
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/* Non-conformant sign response, do fixups. */
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var encodedChallengeObject = responseObject['challenge'];
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if (typeof encodedChallengeObject !== 'undefined') {
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var challengeObject = JSON.parse(atob(encodedChallengeObject));
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var serverChallenge = challengeObject['challenge'];
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var challengesList = this.requestObject_['signData'];
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var requestChallengeObject = null;
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for (var i = 0; i < challengesList.length; i++) {
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var challengeObject = challengesList[i];
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if (challengeObject['keyHandle'] == responseObject['keyHandle']) {
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requestChallengeObject = challengeObject;
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break;
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}
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}
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}
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var responseData = {
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'errorCode': responseObject['resultCode'],
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'keyHandle': responseObject['keyHandle'],
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'signatureData': responseObject['signature'],
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'clientData': encodedChallengeObject
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};
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return {
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'type': u2f.MessageTypes.U2F_SIGN_RESPONSE,
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'responseData': responseData,
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'requestId': responseObject['requestId']
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}
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};
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/**
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* Base URL for intents to Authenticator.
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* @const
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* @private
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*/
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u2f.WrappedAuthenticatorPort_.INTENT_URL_BASE_ =
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'intent:#Intent;action=com.google.android.apps.authenticator.AUTHENTICATE';
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/**
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* Format a return a sign request.
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* @param {Array<u2f.SignRequest>} signRequests
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* @param {number} timeoutSeconds (ignored for now)
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* @param {number} reqId
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* @return {string}
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*/
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u2f.WrappedAuthenticatorPort_.prototype.formatSignRequest_ =
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function(signRequests, timeoutSeconds, reqId) {
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if (!signRequests || signRequests.length == 0) {
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return null;
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}
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/* TODO(fixme): stash away requestId, as the authenticator app does
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* not return it for sign responses. */
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this.requestId_ = reqId;
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/* TODO(fixme): stash away the signRequests, to deal with the legacy
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* response format returned by the Authenticator app. */
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this.requestObject_ = {
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'type': u2f.MessageTypes.U2F_SIGN_REQUEST,
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'signData': signRequests,
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'requestId': reqId,
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'timeout': timeoutSeconds
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};
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var appId = signRequests[0]['appId'];
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var intentUrl =
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u2f.WrappedAuthenticatorPort_.INTENT_URL_BASE_ +
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';S.appId=' + encodeURIComponent(appId) +
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';S.eventId=' + reqId +
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';S.challenges=' +
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encodeURIComponent(
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JSON.stringify(this.getBrowserDataList_(signRequests))) + ';end';
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return intentUrl;
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};
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/**
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* Get the browser data objects from the challenge list
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* @param {Array} challenges list of challenges
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* @return {Array} list of browser data objects
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* @private
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*/
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u2f.WrappedAuthenticatorPort_
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.prototype.getBrowserDataList_ = function(challenges) {
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return challenges
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.map(function(challenge) {
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var browserData = {
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'typ': 'navigator.id.getAssertion',
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'challenge': challenge['challenge']
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};
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var challengeObject = {
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'challenge' : browserData,
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'keyHandle' : challenge['keyHandle']
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};
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return challengeObject;
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});
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};
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/**
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* Format a return a register request.
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* @param {Array<u2f.SignRequest>} signRequests
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* @param {Array<u2f.RegisterRequest>} enrollChallenges
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* @param {number} timeoutSeconds (ignored for now)
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* @param {number} reqId
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* @return {Object}
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*/
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u2f.WrappedAuthenticatorPort_.prototype.formatRegisterRequest_ =
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function(signRequests, enrollChallenges, timeoutSeconds, reqId) {
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if (!enrollChallenges || enrollChallenges.length == 0) {
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return null;
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}
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// Assume the appId is the same for all enroll challenges.
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var appId = enrollChallenges[0]['appId'];
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var registerRequests = [];
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for (var i = 0; i < enrollChallenges.length; i++) {
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var registerRequest = {
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'challenge': enrollChallenges[i]['challenge'],
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'version': enrollChallenges[i]['version']
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};
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if (enrollChallenges[i]['appId'] != appId) {
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// Only include the appId when it differs from the first appId.
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registerRequest['appId'] = enrollChallenges[i]['appId'];
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}
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registerRequests.push(registerRequest);
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}
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var registeredKeys = [];
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if (signRequests) {
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for (i = 0; i < signRequests.length; i++) {
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var key = {
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'keyHandle': signRequests[i]['keyHandle'],
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'version': signRequests[i]['version']
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};
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// Only include the appId when it differs from the appId that's
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// being registered now.
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if (signRequests[i]['appId'] != appId) {
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key['appId'] = signRequests[i]['appId'];
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}
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registeredKeys.push(key);
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}
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}
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var request = {
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'type': u2f.MessageTypes.U2F_REGISTER_REQUEST,
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'appId': appId,
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'registerRequests': registerRequests,
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'registeredKeys': registeredKeys,
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'requestId': reqId,
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'timeoutSeconds': timeoutSeconds
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};
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var intentUrl =
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u2f.WrappedAuthenticatorPort_.INTENT_URL_BASE_ +
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';S.request=' + encodeURIComponent(JSON.stringify(request)) +
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';end';
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/* TODO(fixme): stash away requestId, this is is not necessary for
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* register requests, but here to keep parity with sign.
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*/
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this.requestId_ = reqId;
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return intentUrl;
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};
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/**
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* Sets up an embedded trampoline iframe, sourced from the extension.
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* @param {function(MessagePort)} callback
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* @private
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*/
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u2f.getIframePort_ = function(callback) {
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// Create the iframe
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var iframeOrigin = 'chrome-extension://' + u2f.EXTENSION_ID;
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var iframe = document.createElement('iframe');
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iframe.src = iframeOrigin + '/u2f-comms.html';
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iframe.setAttribute('style', 'display:none');
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document.body.appendChild(iframe);
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var channel = new MessageChannel();
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var ready = function(message) {
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if (message.data == 'ready') {
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channel.port1.removeEventListener('message', ready);
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callback(channel.port1);
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} else {
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console.error('First event on iframe port was not "ready"');
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}
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};
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channel.port1.addEventListener('message', ready);
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channel.port1.start();
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iframe.addEventListener('load', function() {
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// Deliver the port to the iframe and initialize
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iframe.contentWindow.postMessage('init', iframeOrigin, [channel.port2]);
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});
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};
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// High-level JS API
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/**
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* Default extension response timeout in seconds.
|
|
* @const
|
|
*/
|
|
u2f.EXTENSION_TIMEOUT_SEC = 30;
|
|
|
|
/**
|
|
* A singleton instance for a MessagePort to the extension.
|
|
* @type {MessagePort|u2f.WrappedChromeRuntimePort_}
|
|
* @private
|
|
*/
|
|
u2f.port_ = null;
|
|
|
|
/**
|
|
* Callbacks waiting for a port
|
|
* @type {Array<function((MessagePort|u2f.WrappedChromeRuntimePort_))>}
|
|
* @private
|
|
*/
|
|
u2f.waitingForPort_ = [];
|
|
|
|
/**
|
|
* A counter for requestIds.
|
|
* @type {number}
|
|
* @private
|
|
*/
|
|
u2f.reqCounter_ = 0;
|
|
|
|
/**
|
|
* A map from requestIds to client callbacks
|
|
* @type {Object.<number,(function((u2f.Error|u2f.RegisterResponse))
|
|
* |function((u2f.Error|u2f.SignResponse)))>}
|
|
* @private
|
|
*/
|
|
u2f.callbackMap_ = {};
|
|
|
|
/**
|
|
* Creates or retrieves the MessagePort singleton to use.
|
|
* @param {function((MessagePort|u2f.WrappedChromeRuntimePort_))} callback
|
|
* @private
|
|
*/
|
|
u2f.getPortSingleton_ = function(callback) {
|
|
if (u2f.port_) {
|
|
callback(u2f.port_);
|
|
} else {
|
|
if (u2f.waitingForPort_.length == 0) {
|
|
u2f.getMessagePort(function(port) {
|
|
u2f.port_ = port;
|
|
u2f.port_.addEventListener('message',
|
|
/** @type {function(Event)} */ (u2f.responseHandler_));
|
|
|
|
// Careful, here be async callbacks. Maybe.
|
|
while (u2f.waitingForPort_.length)
|
|
u2f.waitingForPort_.shift()(u2f.port_);
|
|
});
|
|
}
|
|
u2f.waitingForPort_.push(callback);
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Handles response messages from the extension.
|
|
* @param {MessageEvent.<u2f.Response>} message
|
|
* @private
|
|
*/
|
|
u2f.responseHandler_ = function(message) {
|
|
var response = message.data;
|
|
var reqId = response['requestId'];
|
|
if (!reqId || !u2f.callbackMap_[reqId]) {
|
|
console.error('Unknown or missing requestId in response.');
|
|
return;
|
|
}
|
|
var cb = u2f.callbackMap_[reqId];
|
|
delete u2f.callbackMap_[reqId];
|
|
cb(response['responseData']);
|
|
};
|
|
|
|
/**
|
|
* Dispatches an array of sign requests to available U2F tokens.
|
|
* @param {Array<u2f.SignRequest>} signRequests
|
|
* @param {function((u2f.Error|u2f.SignResponse))} callback
|
|
* @param {number=} opt_timeoutSeconds
|
|
*/
|
|
u2f.sign = function(signRequests, callback, opt_timeoutSeconds) {
|
|
u2f.getPortSingleton_(function(port) {
|
|
var reqId = ++u2f.reqCounter_;
|
|
u2f.callbackMap_[reqId] = callback;
|
|
var timeoutSeconds = (typeof opt_timeoutSeconds !== 'undefined' ?
|
|
opt_timeoutSeconds : u2f.EXTENSION_TIMEOUT_SEC);
|
|
var req = port.formatSignRequest_(signRequests, timeoutSeconds, reqId);
|
|
port.postMessage(req);
|
|
});
|
|
};
|
|
|
|
/**
|
|
* Dispatches register requests to available U2F tokens. An array of sign
|
|
* requests identifies already registered tokens.
|
|
* @param {Array<u2f.RegisterRequest>} registerRequests
|
|
* @param {Array<u2f.SignRequest>} signRequests
|
|
* @param {function((u2f.Error|u2f.RegisterResponse))} callback
|
|
* @param {number=} opt_timeoutSeconds
|
|
*/
|
|
u2f.register = function(registerRequests, signRequests,
|
|
callback, opt_timeoutSeconds) {
|
|
u2f.getPortSingleton_(function(port) {
|
|
var reqId = ++u2f.reqCounter_;
|
|
u2f.callbackMap_[reqId] = callback;
|
|
var timeoutSeconds = (typeof opt_timeoutSeconds !== 'undefined' ?
|
|
opt_timeoutSeconds : u2f.EXTENSION_TIMEOUT_SEC);
|
|
var req = port.formatRegisterRequest_(
|
|
signRequests, registerRequests, timeoutSeconds, reqId);
|
|
port.postMessage(req);
|
|
});
|
|
}; |