<?php /** * StatusNet, the distributed open-source microblogging tool * * Base class for API actions that require authentication * * PHP version 5 * * LICENCE: This program is free software: you can redistribute it and/or modify * it under the terms of the GNU Affero General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Affero General Public License for more details. * * You should have received a copy of the GNU Affero General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. * * @category API * @package StatusNet * @author Adrian Lang <mail@adrianlang.de> * @author Brenda Wallace <shiny@cpan.org> * @author Craig Andrews <candrews@integralblue.com> * @author Dan Moore <dan@moore.cx> * @author Evan Prodromou <evan@status.net> * @author mEDI <medi@milaro.net> * @author Sarven Capadisli <csarven@status.net> * @author Zach Copley <zach@status.net> * @copyright 2009-2010 StatusNet, Inc. * @copyright 2009 Free Software Foundation, Inc http://www.fsf.org * @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0 * @link http://status.net/ */ /* External API usage documentation. Please update when you change how this method works. */ /*! @page authentication Authentication GNU social supports HTTP Basic Authentication and OAuth for API calls. @warning Currently, users who have created accounts without setting a password via OpenID, Facebook Connect, etc., cannot use the API until they set a password with their account settings panel. @section HTTP Basic Auth @section OAuth */ if (!defined('GNUSOCIAL')) { exit(1); } /** * Actions extending this class will require auth * * @category API * @package StatusNet * @author Zach Copley <zach@status.net> * @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0 * @link http://status.net/ */ class ApiAuthAction extends ApiAction { var $auth_user_nickname = null; var $auth_user_password = null; /** * Take arguments for running, looks for an OAuth request, * and outputs basic auth header if needed * * @param array $args $_REQUEST args * * @return boolean success flag * */ protected function prepare(array $args=array()) { parent::prepare($args); // NOTE: $this->scoped and $this->auth_user has to get set in // prepare(), not handle(), as subclasses use them in prepares. // Allow regular login session if (common_logged_in()) { $this->scoped = Profile::current(); $this->auth_user = $this->scoped->getUser(); if (!$this->auth_user->hasRight(Right::API)) { // TRANS: Authorization exception thrown when a user without API access tries to access the API. throw new AuthorizationException(_('Not allowed to use API.')); } // Let's run this in the same way as if we've just authenticated the user (basic/oauth auth) Event::handle('EndSetApiUser', array($this->auth_user)); $this->access = self::READ_WRITE; } else { $oauthReq = $this->getOAuthRequest(); if ($oauthReq instanceof OAuthRequest) { $this->checkOAuthRequest($oauthReq); } else { // If not using OAuth, check if there is a basic auth // and require it if the current action requires it. $this->checkBasicAuthUser($this->requiresAuth()); } // NOTE: Make sure we're scoped properly based on the auths! if (isset($this->auth_user) && $this->auth_user instanceof User) { $this->scoped = $this->auth_user->getProfile(); } else { $this->scoped = null; } } // legacy user transferral // TODO: remove when sure no extended classes need it $this->user = $this->auth_user; // Reject API calls with the wrong access level if ($this->isReadOnly($args) == false) { if ($this->access != self::READ_WRITE) { // TRANS: Client error 401. $msg = _('API resource requires read-write access, ' . 'but you only have read access.'); $this->clientError($msg, 401); } } return true; } /** * Determine whether the request is an OAuth request. * This is to avoid doign any unnecessary DB lookups. * * @return mixed the OAuthRequest or false */ function getOAuthRequest() { ApiOAuthAction::cleanRequest(); $req = OAuthRequest::from_request(); $consumer = $req->get_parameter('oauth_consumer_key'); $accessToken = $req->get_parameter('oauth_token'); // XXX: Is it good enough to assume it's not meant to be an // OAuth request if there is no consumer or token? --Z if (empty($consumer) || empty($accessToken)) { return false; } return $req; } /** * Verifies the OAuth request signature, sets the auth user * and access type (read-only or read-write) * * @param OAuthRequest $request the OAuth Request * * @return nothing */ function checkOAuthRequest($request) { $datastore = new ApiGNUsocialOAuthDataStore(); $server = new OAuthServer($datastore); $hmac_method = new OAuthSignatureMethod_HMAC_SHA1(); $server->add_signature_method($hmac_method); try { $server->verify_request($request); $consumer = $request->get_parameter('oauth_consumer_key'); $access_token = $request->get_parameter('oauth_token'); $app = Oauth_application::getByConsumerKey($consumer); if (empty($app)) { common_log( LOG_WARNING, 'API OAuth - Couldn\'t find the OAuth app for consumer key: ' . $consumer ); // TRANS: OAuth exception thrown when no application is found for a given consumer key. throw new OAuthException(_('No application for that consumer key.')); } // set the source attr if ($app->name != 'anonymous') { $this->source = $app->name; } $appUser = Oauth_application_user::getKV('token', $access_token); if (!empty($appUser)) { // If access_type == 0 we have either a request token // or a bad / revoked access token if ($appUser->access_type != 0) { // Set the access level for the api call $this->access = ($appUser->access_type & Oauth_application::$writeAccess) ? self::READ_WRITE : self::READ_ONLY; // Set the auth user if (Event::handle('StartSetApiUser', array(&$user))) { $user = User::getKV('id', $appUser->profile_id); } if ($user instanceof User) { if (!$user->hasRight(Right::API)) { // TRANS: Authorization exception thrown when a user without API access tries to access the API. throw new AuthorizationException(_('Not allowed to use API.')); } $this->auth_user = $user; Event::handle('EndSetApiUser', array($this->auth_user)); } else { // If $user is not a real User, let's force it to null. $this->auth_user = null; } // FIXME: setting the value returned by common_current_user() // There should probably be a better method for this. common_set_user() // does lots of session stuff. global $_cur; $_cur = $this->auth_user; $msg = "API OAuth authentication for user '%s' (id: %d) on behalf of " . "application '%s' (id: %d) with %s access."; common_log( LOG_INFO, sprintf( $msg, $this->auth_user->nickname, $this->auth_user->id, $app->name, $app->id, ($this->access = self::READ_WRITE) ? 'read-write' : 'read-only' ) ); } else { // TRANS: OAuth exception given when an incorrect access token was given for a user. throw new OAuthException(_('Bad access token.')); } } else { // Also should not happen. // TRANS: OAuth exception given when no user was found for a given token (no token was found). throw new OAuthException(_('No user for that token.')); } } catch (OAuthException $e) { $this->logAuthFailure($e->getMessage()); common_log(LOG_WARNING, 'API OAuthException - ' . $e->getMessage()); $this->clientError($e->getMessage(), 401); } } /** * Does this API resource require authentication? * * @return boolean true */ public function requiresAuth() { return true; } /** * Check for a user specified via HTTP basic auth. If there isn't * one, try to get one by outputting the basic auth header. * * @return boolean true or false */ function checkBasicAuthUser($required = true) { $this->basicAuthProcessHeader(); $realm = common_config('api', 'realm'); if (empty($realm)) { $realm = common_config('site', 'name') . ' API'; } if (empty($this->auth_user_nickname) && $required) { header('WWW-Authenticate: Basic realm="' . $realm . '"'); // show error if the user clicks 'cancel' // TRANS: Client error thrown when authentication fails because a user clicked "Cancel". $this->clientError(_('Could not authenticate you.'), 401); } elseif ($required) { // $this->auth_user_nickname - i.e. PHP_AUTH_USER - will have a value since it was not empty $user = common_check_user($this->auth_user_nickname, $this->auth_user_password); Event::handle('StartSetApiUser', array(&$user)); if ($user instanceof User) { if (!$user->hasRight(Right::API)) { // TRANS: Authorization exception thrown when a user without API access tries to access the API. throw new AuthorizationException(_('Not allowed to use API.')); } $this->auth_user = $user; Event::handle('EndSetApiUser', array($this->auth_user)); } else { $this->auth_user = null; } // By default, basic auth users have rw access $this->access = self::READ_WRITE; if (!$this->auth_user instanceof User) { $msg = sprintf( "basic auth nickname = %s", $this->auth_user_nickname ); $this->logAuthFailure($msg); // We must present WWW-Authenticate in accordance to HTTP status code 401 header('WWW-Authenticate: Basic realm="' . $realm . '"'); // TRANS: Client error thrown when authentication fails. $this->clientError(_('Could not authenticate you.'), 401); } } else { // all get rw access for actions that don't require auth $this->access = self::READ_WRITE; } } /** * Read the HTTP headers and set the auth user. Decodes HTTP_AUTHORIZATION * param to support basic auth when PHP is running in CGI mode. * * @return void */ function basicAuthProcessHeader() { $authHeaders = array('AUTHORIZATION', 'HTTP_AUTHORIZATION', 'REDIRECT_HTTP_AUTHORIZATION'); // rewrite for CGI $authorization_header = null; foreach ($authHeaders as $header) { if (isset($_SERVER[$header])) { $authorization_header = $_SERVER[$header]; break; } } if (isset($_SERVER['PHP_AUTH_USER'])) { $this->auth_user_nickname = $_SERVER['PHP_AUTH_USER']; $this->auth_user_password = $_SERVER['PHP_AUTH_PW']; } elseif (isset($authorization_header) && strstr(substr($authorization_header, 0, 5), 'Basic')) { // Decode the HTTP_AUTHORIZATION header on php-cgi server self // on fcgid server the header name is AUTHORIZATION $auth_hash = base64_decode(substr($authorization_header, 6)); list($this->auth_user_nickname, $this->auth_user_password) = explode(':', $auth_hash); // Set all to null on a empty basic auth request if (empty($this->auth_user_nickname)) { $this->auth_user_nickname = null; $this->auth_password = null; } } } /** * Log an API authentication failure. Collect the proxy and IP * and log them * * @param string $logMsg additional log message */ function logAuthFailure($logMsg) { list($proxy, $ip) = common_client_ip(); $msg = sprintf( 'API auth failure (proxy = %1$s, ip = %2$s) - ', $proxy, $ip ); common_log(LOG_WARNING, $msg . $logMsg); } }