3 * StatusNet, the distributed open-source microblogging tool
5 * Base class for API actions that require authentication
9 * LICENCE: This program is free software: you can redistribute it and/or modify
10 * it under the terms of the GNU Affero General Public License as published by
11 * the Free Software Foundation, either version 3 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU Affero General Public License for more details.
19 * You should have received a copy of the GNU Affero General Public License
20 * along with this program. If not, see <http://www.gnu.org/licenses/>.
24 * @author Adrian Lang <mail@adrianlang.de>
25 * @author Brenda Wallace <shiny@cpan.org>
26 * @author Craig Andrews <candrews@integralblue.com>
27 * @author Dan Moore <dan@moore.cx>
28 * @author Evan Prodromou <evan@status.net>
29 * @author mEDI <medi@milaro.net>
30 * @author Sarven Capadisli <csarven@status.net>
31 * @author Zach Copley <zach@status.net>
32 * @copyright 2009-2010 StatusNet, Inc.
33 * @copyright 2009 Free Software Foundation, Inc http://www.fsf.org
34 * @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
35 * @link http://status.net/
38 /* External API usage documentation. Please update when you change how this method works. */
40 /*! @page authentication Authentication
42 GNU social supports HTTP Basic Authentication and OAuth for API calls.
44 @warning Currently, users who have created accounts without setting a
45 password via OpenID, Facebook Connect, etc., cannot use the API until
46 they set a password with their account settings panel.
48 @section HTTP Basic Auth
56 if (!defined('GNUSOCIAL')) { exit(1); }
59 * Actions extending this class will require auth
63 * @author Zach Copley <zach@status.net>
64 * @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
65 * @link http://status.net/
67 class ApiAuthAction extends ApiAction
69 var $auth_user_nickname = null;
70 var $auth_user_password = null;
73 * Take arguments for running, looks for an OAuth request,
74 * and outputs basic auth header if needed
76 * @param array $args $_REQUEST args
78 * @return boolean success flag
81 protected function prepare(array $args=array())
83 parent::prepare($args);
85 // NOTE: $this->scoped and $this->auth_user has to get set in
86 // prepare(), not handle(), as subclasses use them in prepares.
88 // Allow regular login session, but we have to double-check the
89 // HTTP_REFERER value to avoid cross domain POSTing since the API
90 // doesn't use the "token" form field.
91 if (common_logged_in() && common_local_referer()) {
92 $this->scoped = Profile::current();
93 $this->auth_user = $this->scoped->getUser();
94 if (!$this->auth_user->hasRight(Right::API)) {
95 // TRANS: Authorization exception thrown when a user without API access tries to access the API.
96 throw new AuthorizationException(_('Not allowed to use API.'));
98 // Let's run this in the same way as if we've just authenticated the user (basic/oauth auth)
99 Event::handle('EndSetApiUser', array($this->auth_user));
100 $this->access = self::READ_WRITE;
102 $oauthReq = $this->getOAuthRequest();
104 if ($oauthReq instanceof OAuthRequest) {
105 $this->checkOAuthRequest($oauthReq);
107 // If not using OAuth, check if there is a basic auth
108 // and require it if the current action requires it.
109 $this->checkBasicAuthUser($this->requiresAuth());
112 // NOTE: Make sure we're scoped properly based on the auths!
113 if (isset($this->auth_user) && $this->auth_user instanceof User) {
114 $this->scoped = $this->auth_user->getProfile();
116 $this->scoped = null;
120 // legacy user transferral
121 // TODO: remove when sure no extended classes need it
122 $this->user = $this->auth_user;
124 // Reject API calls with the wrong access level
126 if ($this->isReadOnly($args) == false) {
127 if ($this->access != self::READ_WRITE) {
128 // TRANS: Client error 401.
129 $msg = _('API resource requires read-write access, ' .
130 'but you only have read access.');
131 $this->clientError($msg, 401);
139 * Determine whether the request is an OAuth request.
140 * This is to avoid doign any unnecessary DB lookups.
142 * @return mixed the OAuthRequest or false
144 function getOAuthRequest()
146 ApiOAuthAction::cleanRequest();
148 $req = OAuthRequest::from_request();
150 $consumer = $req->get_parameter('oauth_consumer_key');
151 $accessToken = $req->get_parameter('oauth_token');
153 // XXX: Is it good enough to assume it's not meant to be an
154 // OAuth request if there is no consumer or token? --Z
156 if (empty($consumer) || empty($accessToken)) {
164 * Verifies the OAuth request signature, sets the auth user
165 * and access type (read-only or read-write)
167 * @param OAuthRequest $request the OAuth Request
171 function checkOAuthRequest($request)
173 $datastore = new ApiGNUsocialOAuthDataStore();
174 $server = new OAuthServer($datastore);
175 $hmac_method = new OAuthSignatureMethod_HMAC_SHA1();
177 $server->add_signature_method($hmac_method);
180 $server->verify_request($request);
182 $consumer = $request->get_parameter('oauth_consumer_key');
183 $access_token = $request->get_parameter('oauth_token');
185 $app = Oauth_application::getByConsumerKey($consumer);
190 'API OAuth - Couldn\'t find the OAuth app for consumer key: ' .
193 // TRANS: OAuth exception thrown when no application is found for a given consumer key.
194 throw new OAuthException(_('No application for that consumer key.'));
197 // set the source attr
198 if ($app->name != 'anonymous') {
199 $this->source = $app->name;
203 $appUser = Oauth_application_user::getKV('token', $access_token);
205 if (!empty($appUser)) {
206 // If access_type == 0 we have either a request token
207 // or a bad / revoked access token
209 if ($appUser->access_type != 0) {
210 // Set the access level for the api call
211 $this->access = ($appUser->access_type & Oauth_application::$writeAccess)
212 ? self::READ_WRITE : self::READ_ONLY;
215 if (Event::handle('StartSetApiUser', array(&$user))) {
216 $user = User::getKV('id', $appUser->profile_id);
218 if ($user instanceof User) {
219 if (!$user->hasRight(Right::API)) {
220 // TRANS: Authorization exception thrown when a user without API access tries to access the API.
221 throw new AuthorizationException(_('Not allowed to use API.'));
223 $this->auth_user = $user;
224 Event::handle('EndSetApiUser', array($this->auth_user));
226 // If $user is not a real User, let's force it to null.
227 $this->auth_user = null;
230 // FIXME: setting the value returned by common_current_user()
231 // There should probably be a better method for this. common_set_user()
232 // does lots of session stuff.
234 $_cur = $this->auth_user;
236 $msg = "API OAuth authentication for user '%s' (id: %d) on behalf of " .
237 "application '%s' (id: %d) with %s access.";
243 $this->auth_user->nickname,
244 $this->auth_user->id,
247 ($this->access = self::READ_WRITE) ? 'read-write' : 'read-only'
251 // TRANS: OAuth exception given when an incorrect access token was given for a user.
252 throw new OAuthException(_('Bad access token.'));
255 // Also should not happen.
256 // TRANS: OAuth exception given when no user was found for a given token (no token was found).
257 throw new OAuthException(_('No user for that token.'));
260 } catch (OAuthException $e) {
261 $this->logAuthFailure($e->getMessage());
262 common_log(LOG_WARNING, 'API OAuthException - ' . $e->getMessage());
263 $this->clientError($e->getMessage(), 401);
268 * Does this API resource require authentication?
270 * @return boolean true
272 public function requiresAuth()
278 * Check for a user specified via HTTP basic auth. If there isn't
279 * one, try to get one by outputting the basic auth header.
281 * @return boolean true or false
283 function checkBasicAuthUser($required = true)
285 $this->basicAuthProcessHeader();
287 $realm = common_config('api', 'realm');
290 $realm = common_config('site', 'name') . ' API';
293 if (empty($this->auth_user_nickname) && $required) {
294 header('WWW-Authenticate: Basic realm="' . $realm . '"');
296 // show error if the user clicks 'cancel'
297 // TRANS: Client error thrown when authentication fails because a user clicked "Cancel".
298 $this->clientError(_('Could not authenticate you.'), 401);
301 // $this->auth_user_nickname - i.e. PHP_AUTH_USER - will have a value since it was not empty
303 $user = common_check_user($this->auth_user_nickname,
304 $this->auth_user_password);
306 Event::handle('StartSetApiUser', array(&$user));
307 if ($user instanceof User) {
308 if (!$user->hasRight(Right::API)) {
309 // TRANS: Authorization exception thrown when a user without API access tries to access the API.
310 throw new AuthorizationException(_('Not allowed to use API.'));
312 $this->auth_user = $user;
314 Event::handle('EndSetApiUser', array($this->auth_user));
316 $this->auth_user = null;
319 if ($required && $this->auth_user instanceof User) {
320 // By default, basic auth users have rw access
321 $this->access = self::READ_WRITE;
322 } elseif ($required) {
324 "basic auth nickname = %s",
325 $this->auth_user_nickname
327 $this->logAuthFailure($msg);
329 // We must present WWW-Authenticate in accordance to HTTP status code 401
330 header('WWW-Authenticate: Basic realm="' . $realm . '"');
331 // TRANS: Client error thrown when authentication fails.
332 $this->clientError(_('Could not authenticate you.'), 401);
334 // all get rw access for actions that don't require auth
335 $this->access = self::READ_WRITE;
341 * Read the HTTP headers and set the auth user. Decodes HTTP_AUTHORIZATION
342 * param to support basic auth when PHP is running in CGI mode.
346 function basicAuthProcessHeader()
348 $authHeaders = array('AUTHORIZATION',
349 'HTTP_AUTHORIZATION',
350 'REDIRECT_HTTP_AUTHORIZATION'); // rewrite for CGI
351 $authorization_header = null;
352 foreach ($authHeaders as $header) {
353 if (isset($_SERVER[$header])) {
354 $authorization_header = $_SERVER[$header];
359 if (isset($_SERVER['PHP_AUTH_USER'])) {
360 $this->auth_user_nickname = $_SERVER['PHP_AUTH_USER'];
361 $this->auth_user_password = $_SERVER['PHP_AUTH_PW'];
362 } elseif (isset($authorization_header)
363 && strstr(substr($authorization_header, 0, 5), 'Basic')) {
365 // Decode the HTTP_AUTHORIZATION header on php-cgi server self
366 // on fcgid server the header name is AUTHORIZATION
367 $auth_hash = base64_decode(substr($authorization_header, 6));
368 list($this->auth_user_nickname,
369 $this->auth_user_password) = explode(':', $auth_hash);
371 // Set all to null on a empty basic auth request
373 if (empty($this->auth_user_nickname)) {
374 $this->auth_user_nickname = null;
375 $this->auth_password = null;
381 * Log an API authentication failure. Collect the proxy and IP
384 * @param string $logMsg additional log message
386 function logAuthFailure($logMsg)
388 list($proxy, $ip) = common_client_ip();
391 'API auth failure (proxy = %1$s, ip = %2$s) - ',
396 common_log(LOG_WARNING, $msg . $logMsg);