5f7032dfee
Evil forms on other websites could otherwise potentially be configured to have action="https://gnusocial.example/api/statuses/update.json" or whatever. XHR is already blocked with CORS stuff. Really, why do browsers allow cross domain POSTs at all? Sigh. The web.
399 lines
14 KiB
PHP
399 lines
14 KiB
PHP
<?php
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/**
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* StatusNet, the distributed open-source microblogging tool
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*
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* Base class for API actions that require authentication
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*
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* PHP version 5
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*
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* LICENCE: This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* @category API
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* @package StatusNet
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* @author Adrian Lang <mail@adrianlang.de>
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* @author Brenda Wallace <shiny@cpan.org>
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* @author Craig Andrews <candrews@integralblue.com>
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* @author Dan Moore <dan@moore.cx>
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* @author Evan Prodromou <evan@status.net>
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* @author mEDI <medi@milaro.net>
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* @author Sarven Capadisli <csarven@status.net>
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* @author Zach Copley <zach@status.net>
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* @copyright 2009-2010 StatusNet, Inc.
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* @copyright 2009 Free Software Foundation, Inc http://www.fsf.org
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* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
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* @link http://status.net/
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*/
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/* External API usage documentation. Please update when you change how this method works. */
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/*! @page authentication Authentication
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GNU social supports HTTP Basic Authentication and OAuth for API calls.
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@warning Currently, users who have created accounts without setting a
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password via OpenID, Facebook Connect, etc., cannot use the API until
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they set a password with their account settings panel.
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@section HTTP Basic Auth
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@section OAuth
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*/
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if (!defined('GNUSOCIAL')) { exit(1); }
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/**
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* Actions extending this class will require auth
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*
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* @category API
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* @package StatusNet
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* @author Zach Copley <zach@status.net>
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* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
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* @link http://status.net/
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*/
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class ApiAuthAction extends ApiAction
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{
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var $auth_user_nickname = null;
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var $auth_user_password = null;
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/**
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* Take arguments for running, looks for an OAuth request,
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* and outputs basic auth header if needed
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*
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* @param array $args $_REQUEST args
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*
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* @return boolean success flag
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*
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*/
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protected function prepare(array $args=array())
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{
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parent::prepare($args);
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// NOTE: $this->scoped and $this->auth_user has to get set in
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// prepare(), not handle(), as subclasses use them in prepares.
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// Allow regular login session, but we have to double-check the
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// HTTP_REFERER value to avoid cross domain POSTing since the API
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// doesn't use the "token" form field.
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if (common_logged_in() && common_local_referer()) {
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$this->scoped = Profile::current();
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$this->auth_user = $this->scoped->getUser();
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if (!$this->auth_user->hasRight(Right::API)) {
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// TRANS: Authorization exception thrown when a user without API access tries to access the API.
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throw new AuthorizationException(_('Not allowed to use API.'));
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}
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// Let's run this in the same way as if we've just authenticated the user (basic/oauth auth)
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Event::handle('EndSetApiUser', array($this->auth_user));
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$this->access = self::READ_WRITE;
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} else {
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$oauthReq = $this->getOAuthRequest();
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if ($oauthReq instanceof OAuthRequest) {
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$this->checkOAuthRequest($oauthReq);
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} else {
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// If not using OAuth, check if there is a basic auth
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// and require it if the current action requires it.
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$this->checkBasicAuthUser($this->requiresAuth());
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}
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// NOTE: Make sure we're scoped properly based on the auths!
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if (isset($this->auth_user) && $this->auth_user instanceof User) {
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$this->scoped = $this->auth_user->getProfile();
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} else {
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$this->scoped = null;
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}
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}
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// legacy user transferral
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// TODO: remove when sure no extended classes need it
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$this->user = $this->auth_user;
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// Reject API calls with the wrong access level
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if ($this->isReadOnly($args) == false) {
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if ($this->access != self::READ_WRITE) {
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// TRANS: Client error 401.
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$msg = _('API resource requires read-write access, ' .
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'but you only have read access.');
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$this->clientError($msg, 401);
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}
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}
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return true;
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}
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/**
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* Determine whether the request is an OAuth request.
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* This is to avoid doign any unnecessary DB lookups.
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*
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* @return mixed the OAuthRequest or false
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*/
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function getOAuthRequest()
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{
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ApiOAuthAction::cleanRequest();
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$req = OAuthRequest::from_request();
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$consumer = $req->get_parameter('oauth_consumer_key');
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$accessToken = $req->get_parameter('oauth_token');
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// XXX: Is it good enough to assume it's not meant to be an
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// OAuth request if there is no consumer or token? --Z
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if (empty($consumer) || empty($accessToken)) {
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return false;
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}
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return $req;
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}
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/**
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* Verifies the OAuth request signature, sets the auth user
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* and access type (read-only or read-write)
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*
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* @param OAuthRequest $request the OAuth Request
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*
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* @return nothing
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*/
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function checkOAuthRequest($request)
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{
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$datastore = new ApiGNUsocialOAuthDataStore();
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$server = new OAuthServer($datastore);
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$hmac_method = new OAuthSignatureMethod_HMAC_SHA1();
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$server->add_signature_method($hmac_method);
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try {
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$server->verify_request($request);
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$consumer = $request->get_parameter('oauth_consumer_key');
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$access_token = $request->get_parameter('oauth_token');
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$app = Oauth_application::getByConsumerKey($consumer);
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if (empty($app)) {
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common_log(
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LOG_WARNING,
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'API OAuth - Couldn\'t find the OAuth app for consumer key: ' .
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$consumer
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);
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// TRANS: OAuth exception thrown when no application is found for a given consumer key.
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throw new OAuthException(_('No application for that consumer key.'));
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}
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// set the source attr
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if ($app->name != 'anonymous') {
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$this->source = $app->name;
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}
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$appUser = Oauth_application_user::getKV('token', $access_token);
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if (!empty($appUser)) {
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// If access_type == 0 we have either a request token
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// or a bad / revoked access token
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if ($appUser->access_type != 0) {
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// Set the access level for the api call
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$this->access = ($appUser->access_type & Oauth_application::$writeAccess)
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? self::READ_WRITE : self::READ_ONLY;
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// Set the auth user
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if (Event::handle('StartSetApiUser', array(&$user))) {
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$user = User::getKV('id', $appUser->profile_id);
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}
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if ($user instanceof User) {
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if (!$user->hasRight(Right::API)) {
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// TRANS: Authorization exception thrown when a user without API access tries to access the API.
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throw new AuthorizationException(_('Not allowed to use API.'));
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}
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$this->auth_user = $user;
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Event::handle('EndSetApiUser', array($this->auth_user));
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} else {
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// If $user is not a real User, let's force it to null.
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$this->auth_user = null;
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}
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// FIXME: setting the value returned by common_current_user()
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// There should probably be a better method for this. common_set_user()
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// does lots of session stuff.
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global $_cur;
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$_cur = $this->auth_user;
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$msg = "API OAuth authentication for user '%s' (id: %d) on behalf of " .
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"application '%s' (id: %d) with %s access.";
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common_log(
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LOG_INFO,
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sprintf(
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$msg,
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$this->auth_user->nickname,
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$this->auth_user->id,
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$app->name,
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$app->id,
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($this->access = self::READ_WRITE) ? 'read-write' : 'read-only'
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)
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);
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} else {
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// TRANS: OAuth exception given when an incorrect access token was given for a user.
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throw new OAuthException(_('Bad access token.'));
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}
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} else {
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// Also should not happen.
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// TRANS: OAuth exception given when no user was found for a given token (no token was found).
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throw new OAuthException(_('No user for that token.'));
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}
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} catch (OAuthException $e) {
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$this->logAuthFailure($e->getMessage());
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common_log(LOG_WARNING, 'API OAuthException - ' . $e->getMessage());
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$this->clientError($e->getMessage(), 401);
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}
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}
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/**
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* Does this API resource require authentication?
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*
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* @return boolean true
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*/
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public function requiresAuth()
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{
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return true;
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}
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/**
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* Check for a user specified via HTTP basic auth. If there isn't
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* one, try to get one by outputting the basic auth header.
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*
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* @return boolean true or false
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*/
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function checkBasicAuthUser($required = true)
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{
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$this->basicAuthProcessHeader();
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$realm = common_config('api', 'realm');
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if (empty($realm)) {
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$realm = common_config('site', 'name') . ' API';
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}
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if (empty($this->auth_user_nickname) && $required) {
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header('WWW-Authenticate: Basic realm="' . $realm . '"');
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// show error if the user clicks 'cancel'
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// TRANS: Client error thrown when authentication fails because a user clicked "Cancel".
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$this->clientError(_('Could not authenticate you.'), 401);
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} else {
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// $this->auth_user_nickname - i.e. PHP_AUTH_USER - will have a value since it was not empty
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$user = common_check_user($this->auth_user_nickname,
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$this->auth_user_password);
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Event::handle('StartSetApiUser', array(&$user));
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if ($user instanceof User) {
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if (!$user->hasRight(Right::API)) {
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// TRANS: Authorization exception thrown when a user without API access tries to access the API.
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throw new AuthorizationException(_('Not allowed to use API.'));
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}
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$this->auth_user = $user;
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Event::handle('EndSetApiUser', array($this->auth_user));
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} else {
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$this->auth_user = null;
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}
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if ($required && $this->auth_user instanceof User) {
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// By default, basic auth users have rw access
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$this->access = self::READ_WRITE;
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} elseif ($required) {
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$msg = sprintf(
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"basic auth nickname = %s",
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$this->auth_user_nickname
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);
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$this->logAuthFailure($msg);
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// We must present WWW-Authenticate in accordance to HTTP status code 401
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header('WWW-Authenticate: Basic realm="' . $realm . '"');
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// TRANS: Client error thrown when authentication fails.
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$this->clientError(_('Could not authenticate you.'), 401);
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} else {
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// all get rw access for actions that don't require auth
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$this->access = self::READ_WRITE;
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}
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}
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}
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/**
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* Read the HTTP headers and set the auth user. Decodes HTTP_AUTHORIZATION
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* param to support basic auth when PHP is running in CGI mode.
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*
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* @return void
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*/
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function basicAuthProcessHeader()
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{
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$authHeaders = array('AUTHORIZATION',
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'HTTP_AUTHORIZATION',
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'REDIRECT_HTTP_AUTHORIZATION'); // rewrite for CGI
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$authorization_header = null;
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foreach ($authHeaders as $header) {
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if (isset($_SERVER[$header])) {
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$authorization_header = $_SERVER[$header];
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break;
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}
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}
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if (isset($_SERVER['PHP_AUTH_USER'])) {
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$this->auth_user_nickname = $_SERVER['PHP_AUTH_USER'];
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$this->auth_user_password = $_SERVER['PHP_AUTH_PW'];
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} elseif (isset($authorization_header)
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&& strstr(substr($authorization_header, 0, 5), 'Basic')) {
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// Decode the HTTP_AUTHORIZATION header on php-cgi server self
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// on fcgid server the header name is AUTHORIZATION
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$auth_hash = base64_decode(substr($authorization_header, 6));
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list($this->auth_user_nickname,
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$this->auth_user_password) = explode(':', $auth_hash);
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// Set all to null on a empty basic auth request
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if (empty($this->auth_user_nickname)) {
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$this->auth_user_nickname = null;
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$this->auth_password = null;
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}
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}
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}
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/**
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* Log an API authentication failure. Collect the proxy and IP
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* and log them
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*
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* @param string $logMsg additional log message
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*/
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function logAuthFailure($logMsg)
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{
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list($proxy, $ip) = common_client_ip();
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$msg = sprintf(
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'API auth failure (proxy = %1$s, ip = %2$s) - ',
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$proxy,
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$ip
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);
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common_log(LOG_WARNING, $msg . $logMsg);
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}
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}
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