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<?php |
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/* |
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* Copyright 2008 Google Inc. |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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*/ |
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|
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require_once $GLOBALS['iwp_mmb_plugin_dir']."/lib/Google/Auth/Abstract.php"; |
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require_once $GLOBALS['iwp_mmb_plugin_dir']."/lib/Google/Auth/AssertionCredentials.php"; |
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require_once $GLOBALS['iwp_mmb_plugin_dir']."/lib/Google/Auth/Exception.php"; |
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require_once $GLOBALS['iwp_mmb_plugin_dir']."/lib/Google/Auth/LoginTicket.php"; |
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require_once $GLOBALS['iwp_mmb_plugin_dir']."/lib/Google/Client.php"; |
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require_once $GLOBALS['iwp_mmb_plugin_dir']."/lib/Google/Http/Request.php"; |
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require_once $GLOBALS['iwp_mmb_plugin_dir']."/lib/Google/Utils.php"; |
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require_once $GLOBALS['iwp_mmb_plugin_dir']."/lib/Google/Verifier/Pem.php"; |
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|
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/** |
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* Authentication class that deals with the OAuth 2 web-server authentication flow |
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* |
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* @author Chris Chabot <chabotc@google.com> |
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* @author Chirag Shah <chirags@google.com> |
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* |
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*/ |
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class IWP_google_Auth_OAuth2 extends IWP_google_Auth_Abstract |
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{ |
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const OAUTH2_REVOKE_URI = 'https://accounts.google.com/o/oauth2/revoke'; |
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const OAUTH2_TOKEN_URI = 'https://accounts.google.com/o/oauth2/token'; |
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const OAUTH2_AUTH_URL = 'https://accounts.google.com/o/oauth2/auth'; |
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const CLOCK_SKEW_SECS = 300; // five minutes in seconds |
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const AUTH_TOKEN_LIFETIME_SECS = 300; // five minutes in seconds |
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const MAX_TOKEN_LIFETIME_SECS = 86400; // one day in seconds |
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const OAUTH2_ISSUER = 'accounts.google.com'; |
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|
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/** @var IWP_google_Auth_AssertionCredentials $assertionCredentials */ |
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private $assertionCredentials; |
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|
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/** |
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* @var string The state parameters for CSRF and other forgery protection. |
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*/ |
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private $state; |
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|
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/** |
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* @var array The token bundle. |
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*/ |
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private $token = array(); |
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|
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/** |
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* @var IWP_google_Client the base client |
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*/ |
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private $client; |
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|
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/** |
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* Instantiates the class, but does not initiate the login flow, leaving it |
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* to the discretion of the caller. |
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*/ |
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public function __construct(IWP_google_Client $client) |
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{ |
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$this->client = $client; |
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} |
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|
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/** |
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* Perform an authenticated / signed apiHttpRequest. |
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* This function takes the apiHttpRequest, calls apiAuth->sign on it |
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* (which can modify the request in what ever way fits the auth mechanism) |
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* and then calls apiCurlIO::makeRequest on the signed request |
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* |
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* @param IWP_google_Http_Request $request |
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* @return IWP_google_Http_Request The resulting HTTP response including the |
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* responseHttpCode, responseHeaders and responseBody. |
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*/ |
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public function authenticatedRequest(IWP_google_Http_Request $request) |
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{ |
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$request = $this->sign($request); |
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return $this->client->getIo()->makeRequest($request); |
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} |
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|
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/** |
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* @param string $code |
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* @throws IWP_google_Auth_Exception |
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* @return string |
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*/ |
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public function authenticate($code) |
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{ |
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if (strlen($code) == 0) { |
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throw new IWP_google_Auth_Exception("Invalid code"); |
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} |
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|
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// We got here from the redirect from a successful authorization grant, |
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// fetch the access token |
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$request = new IWP_google_Http_Request( |
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self::OAUTH2_TOKEN_URI, |
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'POST', |
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array(), |
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array( |
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'code' => $code, |
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'grant_type' => 'authorization_code', |
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'redirect_uri' => $this->client->getClassConfig($this, 'redirect_uri'), |
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'client_id' => $this->client->getClassConfig($this, 'client_id'), |
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'client_secret' => $this->client->getClassConfig($this, 'client_secret') |
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) |
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); |
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$request->disableGzip(); |
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$response = $this->client->getIo()->makeRequest($request); |
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|
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if ($response->getResponseHttpCode() == 200) { |
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$this->setAccessToken($response->getResponseBody()); |
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$this->token['created'] = time(); |
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return $this->getAccessToken(); |
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} else { |
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$decodedResponse = json_decode($response->getResponseBody(), true); |
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if ($decodedResponse != null && $decodedResponse['error']) { |
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$decodedResponse = $decodedResponse['error']; |
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} |
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throw new IWP_google_Auth_Exception( |
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sprintf( |
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"Error fetching OAuth2 access token, message: '%s'", |
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$decodedResponse |
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), |
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$response->getResponseHttpCode() |
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); |
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} |
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} |
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|
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/** |
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* Create a URL to obtain user authorization. |
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* The authorization endpoint allows the user to first |
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* authenticate, and then grant/deny the access request. |
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* @param string $scope The scope is expressed as a list of space-delimited strings. |
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* @return string |
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*/ |
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public function createAuthUrl($scope) |
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{ |
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$params = array( |
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'response_type' => 'code', |
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'redirect_uri' => $this->client->getClassConfig($this, 'redirect_uri'), |
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'client_id' => $this->client->getClassConfig($this, 'client_id'), |
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'scope' => $scope, |
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'access_type' => $this->client->getClassConfig($this, 'access_type'), |
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'approval_prompt' => $this->client->getClassConfig($this, 'approval_prompt'), |
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); |
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|
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// If the list of scopes contains plus.login, add request_visible_actions |
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// to auth URL. |
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$rva = $this->client->getClassConfig($this, 'request_visible_actions'); |
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if (strpos($scope, 'plus.login') && strlen($rva) > 0) { |
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$params['request_visible_actions'] = $rva; |
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} |
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|
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if (isset($this->state)) { |
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$params['state'] = $this->state; |
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} |
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|
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return self::OAUTH2_AUTH_URL . "?" . http_build_query($params, '', '&'); |
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} |
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|
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/** |
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* @param string $token |
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* @throws IWP_google_Auth_Exception |
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*/ |
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public function setAccessToken($token) |
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{ |
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$token = json_decode($token, true); |
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if ($token == null) { |
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throw new IWP_google_Auth_Exception('Could not json decode the token'); |
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} |
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if (! isset($token['access_token'])) { |
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throw new IWP_google_Auth_Exception("Invalid token format"); |
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} |
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$this->token = $token; |
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} |
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|
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public function getAccessToken() |
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{ |
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return json_encode($this->token); |
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} |
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|
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public function setState($state) |
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{ |
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$this->state = $state; |
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} |
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|
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public function setAssertionCredentials(IWP_google_Auth_AssertionCredentials $creds) |
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{ |
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$this->assertionCredentials = $creds; |
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} |
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|
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/** |
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* Include an accessToken in a given apiHttpRequest. |
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* @param IWP_google_Http_Request $request |
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* @return IWP_google_Http_Request |
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* @throws IWP_google_Auth_Exception |
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*/ |
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public function sign(IWP_google_Http_Request $request) |
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{ |
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// add the developer key to the request before signing it |
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if ($this->client->getClassConfig($this, 'developer_key')) { |
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$request->setQueryParam('key', $this->client->getClassConfig($this, 'developer_key')); |
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} |
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|
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// Cannot sign the request without an OAuth access token. |
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if (null == $this->token && null == $this->assertionCredentials) { |
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return $request; |
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} |
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|
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// Check if the token is set to expire in the next 30 seconds |
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// (or has already expired). |
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if ($this->isAccessTokenExpired()) { |
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if ($this->assertionCredentials) { |
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$this->refreshTokenWithAssertion(); |
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} else { |
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if (! array_key_exists('refresh_token', $this->token)) { |
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throw new IWP_google_Auth_Exception( |
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"The OAuth 2.0 access token has expired," |
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." and a refresh token is not available. Refresh tokens" |
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." are not returned for responses that were auto-approved." |
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); |
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} |
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$this->refreshToken($this->token['refresh_token']); |
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} |
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} |
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|
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// Add the OAuth2 header to the request |
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$request->setRequestHeaders( |
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array('Authorization' => 'Bearer ' . $this->token['access_token']) |
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); |
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|
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return $request; |
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} |
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|
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/** |
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* Fetches a fresh access token with the given refresh token. |
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* @param string $refreshToken |
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* @return void |
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*/ |
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public function refreshToken($refreshToken) |
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{ |
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$this->refreshTokenRequest( |
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array( |
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'client_id' => $this->client->getClassConfig($this, 'client_id'), |
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'client_secret' => $this->client->getClassConfig($this, 'client_secret'), |
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'refresh_token' => $refreshToken, |
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'grant_type' => 'refresh_token' |
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) |
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); |
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} |
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|
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/** |
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* Fetches a fresh access token with a given assertion token. |
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* @param IWP_google_Auth_AssertionCredentials $assertionCredentials optional. |
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* @return void |
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*/ |
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public function refreshTokenWithAssertion($assertionCredentials = null) |
| 263 |
{ |
| 264 |
if (!$assertionCredentials) { |
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$assertionCredentials = $this->assertionCredentials; |
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} |
| 267 |
|
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$cacheKey = $assertionCredentials->getCacheKey(); |
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|
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if ($cacheKey) { |
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// We can check whether we have a token available in the |
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// cache. If it is expired, we can retrieve a new one from |
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// the assertion. |
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$token = $this->client->getCache()->get($cacheKey); |
| 275 |
if ($token) { |
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$this->setAccessToken($token); |
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} |
| 278 |
if (!$this->isAccessTokenExpired()) { |
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return; |
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} |
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} |
| 282 |
|
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$this->refreshTokenRequest( |
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array( |
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'grant_type' => 'assertion', |
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'assertion_type' => $assertionCredentials->assertionType, |
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'assertion' => $assertionCredentials->generateAssertion(), |
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) |
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); |
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|
| 291 |
if ($cacheKey) { |
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// Attempt to cache the token. |
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$this->client->getCache()->set( |
| 294 |
$cacheKey, |
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$this->getAccessToken() |
| 296 |
); |
| 297 |
} |
| 298 |
} |
| 299 |
|
| 300 |
private function refreshTokenRequest($params) |
| 301 |
{ |
| 302 |
$http = new IWP_google_Http_Request( |
| 303 |
self::OAUTH2_TOKEN_URI, |
| 304 |
'POST', |
| 305 |
array(), |
| 306 |
$params |
| 307 |
); |
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$http->disableGzip(); |
| 309 |
$request = $this->client->getIo()->makeRequest($http); |
| 310 |
|
| 311 |
$code = $request->getResponseHttpCode(); |
| 312 |
$body = $request->getResponseBody(); |
| 313 |
if (200 == $code) { |
| 314 |
$token = json_decode($body, true); |
| 315 |
if ($token == null) { |
| 316 |
throw new IWP_google_Auth_Exception("Could not json decode the access token"); |
| 317 |
} |
| 318 |
|
| 319 |
if (! isset($token['access_token']) || ! isset($token['expires_in'])) { |
| 320 |
throw new IWP_google_Auth_Exception("Invalid token format"); |
| 321 |
} |
| 322 |
|
| 323 |
$this->token['access_token'] = $token['access_token']; |
| 324 |
$this->token['expires_in'] = $token['expires_in']; |
| 325 |
$this->token['created'] = time(); |
| 326 |
} else { |
| 327 |
throw new IWP_google_Auth_Exception("Error refreshing the OAuth2 token, message: '$body'", $code); |
| 328 |
} |
| 329 |
} |
| 330 |
|
| 331 |
/** |
| 332 |
* Revoke an OAuth2 access token or refresh token. This method will revoke the current access |
| 333 |
* token, if a token isn't provided. |
| 334 |
* @throws IWP_google_Auth_Exception |
| 335 |
* @param string|null $token The token (access token or a refresh token) that should be revoked. |
| 336 |
* @return boolean Returns True if the revocation was successful, otherwise False. |
| 337 |
*/ |
| 338 |
public function revokeToken($token = null) |
| 339 |
{ |
| 340 |
if (!$token) { |
| 341 |
if (!$this->token) { |
| 342 |
// Not initialized, no token to actually revoke |
| 343 |
return false; |
| 344 |
} elseif (array_key_exists('refresh_token', $this->token)) { |
| 345 |
$token = $this->token['refresh_token']; |
| 346 |
} else { |
| 347 |
$token = $this->token['access_token']; |
| 348 |
} |
| 349 |
} |
| 350 |
$request = new IWP_google_Http_Request( |
| 351 |
self::OAUTH2_REVOKE_URI, |
| 352 |
'POST', |
| 353 |
array(), |
| 354 |
"token=$token" |
| 355 |
); |
| 356 |
$request->disableGzip(); |
| 357 |
$response = $this->client->getIo()->makeRequest($request); |
| 358 |
$code = $response->getResponseHttpCode(); |
| 359 |
if ($code == 200) { |
| 360 |
$this->token = null; |
| 361 |
return true; |
| 362 |
} |
| 363 |
|
| 364 |
return false; |
| 365 |
} |
| 366 |
|
| 367 |
/** |
| 368 |
* Returns if the access_token is expired. |
| 369 |
* @return bool Returns True if the access_token is expired. |
| 370 |
*/ |
| 371 |
public function isAccessTokenExpired() |
| 372 |
{ |
| 373 |
if (!$this->token || !isset($this->token['created'])) { |
| 374 |
return true; |
| 375 |
} |
| 376 |
|
| 377 |
// If the token is set to expire in the next 30 seconds. |
| 378 |
$expired = ($this->token['created'] |
| 379 |
+ ($this->token['expires_in'] - 30)) < time(); |
| 380 |
|
| 381 |
return $expired; |
| 382 |
} |
| 383 |
|
| 384 |
// Gets federated sign-on certificates to use for verifying identity tokens. |
| 385 |
// Returns certs as array structure, where keys are key ids, and values |
| 386 |
// are PEM encoded certificates. |
| 387 |
private function getFederatedSignOnCerts() |
| 388 |
{ |
| 389 |
return $this->retrieveCertsFromLocation( |
| 390 |
$this->client->getClassConfig($this, 'federated_signon_certs_url') |
| 391 |
); |
| 392 |
} |
| 393 |
|
| 394 |
/** |
| 395 |
* Retrieve and cache a certificates file. |
| 396 |
* @param $url location |
| 397 |
* @return array certificates |
| 398 |
*/ |
| 399 |
public function retrieveCertsFromLocation($url) |
| 400 |
{ |
| 401 |
// If we're retrieving a local file, just grab it. |
| 402 |
if ("http" != substr($url, 0, 4)) { |
| 403 |
$file = file_get_contents($url); |
| 404 |
if ($file) { |
| 405 |
return json_decode($file, true); |
| 406 |
} else { |
| 407 |
throw new IWP_google_Auth_Exception( |
| 408 |
"Failed to retrieve verification certificates: '" . |
| 409 |
$url . "'." |
| 410 |
); |
| 411 |
} |
| 412 |
} |
| 413 |
|
| 414 |
// This relies on makeRequest caching certificate responses. |
| 415 |
$request = $this->client->getIo()->makeRequest( |
| 416 |
new IWP_google_Http_Request( |
| 417 |
$url |
| 418 |
) |
| 419 |
); |
| 420 |
if ($request->getResponseHttpCode() == 200) { |
| 421 |
$certs = json_decode($request->getResponseBody(), true); |
| 422 |
if ($certs) { |
| 423 |
return $certs; |
| 424 |
} |
| 425 |
} |
| 426 |
throw new IWP_google_Auth_Exception( |
| 427 |
"Failed to retrieve verification certificates: '" . |
| 428 |
$request->getResponseBody() . "'.", |
| 429 |
$request->getResponseHttpCode() |
| 430 |
); |
| 431 |
} |
| 432 |
|
| 433 |
/** |
| 434 |
* Verifies an id token and returns the authenticated apiLoginTicket. |
| 435 |
* Throws an exception if the id token is not valid. |
| 436 |
* The audience parameter can be used to control which id tokens are |
| 437 |
* accepted. By default, the id token must have been issued to this OAuth2 client. |
| 438 |
* |
| 439 |
* @param $id_token |
| 440 |
* @param $audience |
| 441 |
* @return IWP_google_Auth_LoginTicket |
| 442 |
*/ |
| 443 |
public function verifyIdToken($id_token = null, $audience = null) |
| 444 |
{ |
| 445 |
if (!$id_token) { |
| 446 |
$id_token = $this->token['id_token']; |
| 447 |
} |
| 448 |
$certs = $this->getFederatedSignonCerts(); |
| 449 |
if (!$audience) { |
| 450 |
$audience = $this->client->getClassConfig($this, 'client_id'); |
| 451 |
} |
| 452 |
|
| 453 |
return $this->verifySignedJwtWithCerts($id_token, $certs, $audience, self::OAUTH2_ISSUER); |
| 454 |
} |
| 455 |
|
| 456 |
/** |
| 457 |
* Verifies the id token, returns the verified token contents. |
| 458 |
* |
| 459 |
* @param $jwt the token |
| 460 |
* @param $certs array of certificates |
| 461 |
* @param $required_audience the expected consumer of the token |
| 462 |
* @param [$issuer] the expected issues, defaults to Google |
| 463 |
* @param [$max_expiry] the max lifetime of a token, defaults to MAX_TOKEN_LIFETIME_SECS |
| 464 |
* @return token information if valid, false if not |
| 465 |
*/ |
| 466 |
public function verifySignedJwtWithCerts( |
| 467 |
$jwt, |
| 468 |
$certs, |
| 469 |
$required_audience, |
| 470 |
$issuer = null, |
| 471 |
$max_expiry = null |
| 472 |
) { |
| 473 |
if (!$max_expiry) { |
| 474 |
// Set the maximum time we will accept a token for. |
| 475 |
$max_expiry = self::MAX_TOKEN_LIFETIME_SECS; |
| 476 |
} |
| 477 |
|
| 478 |
$segments = explode(".", $jwt); |
| 479 |
if (count($segments) != 3) { |
| 480 |
throw new IWP_google_Auth_Exception("Wrong number of segments in token: $jwt"); |
| 481 |
} |
| 482 |
$signed = $segments[0] . "." . $segments[1]; |
| 483 |
$signature = IWP_google_Utils::urlSafeB64Decode($segments[2]); |
| 484 |
|
| 485 |
// Parse envelope. |
| 486 |
$envelope = json_decode(IWP_google_Utils::urlSafeB64Decode($segments[0]), true); |
| 487 |
if (!$envelope) { |
| 488 |
throw new IWP_google_Auth_Exception("Can't parse token envelope: " . $segments[0]); |
| 489 |
} |
| 490 |
|
| 491 |
// Parse token |
| 492 |
$json_body = IWP_google_Utils::urlSafeB64Decode($segments[1]); |
| 493 |
$payload = json_decode($json_body, true); |
| 494 |
if (!$payload) { |
| 495 |
throw new IWP_google_Auth_Exception("Can't parse token payload: " . $segments[1]); |
| 496 |
} |
| 497 |
|
| 498 |
// Check signature |
| 499 |
$verified = false; |
| 500 |
foreach ($certs as $keyName => $pem) { |
| 501 |
$public_key = new IWP_google_Verifier_Pem($pem); |
| 502 |
if ($public_key->verify($signed, $signature)) { |
| 503 |
$verified = true; |
| 504 |
break; |
| 505 |
} |
| 506 |
} |
| 507 |
|
| 508 |
if (!$verified) { |
| 509 |
throw new IWP_google_Auth_Exception("Invalid token signature: $jwt"); |
| 510 |
} |
| 511 |
|
| 512 |
// Check issued-at timestamp |
| 513 |
$iat = 0; |
| 514 |
if (array_key_exists("iat", $payload)) { |
| 515 |
$iat = $payload["iat"]; |
| 516 |
} |
| 517 |
if (!$iat) { |
| 518 |
throw new IWP_google_Auth_Exception("No issue time in token: $json_body"); |
| 519 |
} |
| 520 |
$earliest = $iat - self::CLOCK_SKEW_SECS; |
| 521 |
|
| 522 |
// Check expiration timestamp |
| 523 |
$now = time(); |
| 524 |
$exp = 0; |
| 525 |
if (array_key_exists("exp", $payload)) { |
| 526 |
$exp = $payload["exp"]; |
| 527 |
} |
| 528 |
if (!$exp) { |
| 529 |
throw new IWP_google_Auth_Exception("No expiration time in token: $json_body"); |
| 530 |
} |
| 531 |
if ($exp >= $now + $max_expiry) { |
| 532 |
throw new IWP_google_Auth_Exception( |
| 533 |
sprintf("Expiration time too far in future: %s", $json_body) |
| 534 |
); |
| 535 |
} |
| 536 |
|
| 537 |
$latest = $exp + self::CLOCK_SKEW_SECS; |
| 538 |
if ($now < $earliest) { |
| 539 |
throw new IWP_google_Auth_Exception( |
| 540 |
sprintf( |
| 541 |
"Token used too early, %s < %s: %s", |
| 542 |
$now, |
| 543 |
$earliest, |
| 544 |
$json_body |
| 545 |
) |
| 546 |
); |
| 547 |
} |
| 548 |
if ($now > $latest) { |
| 549 |
throw new IWP_google_Auth_Exception( |
| 550 |
sprintf( |
| 551 |
"Token used too late, %s > %s: %s", |
| 552 |
$now, |
| 553 |
$latest, |
| 554 |
$json_body |
| 555 |
) |
| 556 |
); |
| 557 |
} |
| 558 |
|
| 559 |
$iss = $payload['iss']; |
| 560 |
if ($issuer && $iss != $issuer) { |
| 561 |
throw new IWP_google_Auth_Exception( |
| 562 |
sprintf( |
| 563 |
"Invalid issuer, %s != %s: %s", |
| 564 |
$iss, |
| 565 |
$issuer, |
| 566 |
$json_body |
| 567 |
) |
| 568 |
); |
| 569 |
} |
| 570 |
|
| 571 |
// Check audience |
| 572 |
$aud = $payload["aud"]; |
| 573 |
if ($aud != $required_audience) { |
| 574 |
throw new IWP_google_Auth_Exception( |
| 575 |
sprintf( |
| 576 |
"Wrong recipient, %s != %s:", |
| 577 |
$aud, |
| 578 |
$required_audience, |
| 579 |
$json_body |
| 580 |
) |
| 581 |
); |
| 582 |
} |
| 583 |
|
| 584 |
// All good. |
| 585 |
return new IWP_google_Auth_LoginTicket($envelope, $payload); |
| 586 |
} |
| 587 |
} |
| 588 |
|
