gnu-social/lib/apiauthaction.php

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<?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
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* @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) {
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// TRANS: Client error 401.
$msg = _('API resource requires read-write access, ' .
'but you only have read access.');
$this->clientError($msg, 401);
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}
}
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)
{
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$datastore = new ApiGNUsocialOAuthDataStore();
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$server = new OAuthServer($datastore);
$hmac_method = new OAuthSignatureMethod_HMAC_SHA1();
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$server->add_signature_method($hmac_method);
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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)) {
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common_log(
LOG_WARNING,
'API OAuth - Couldn\'t find the OAuth app for consumer key: ' .
$consumer
);
// TRANS: OAuth exception thrown when no application is found for a given consumer key.
throw new OAuthException(_('No application for that consumer key.'));
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}
// set the source attr
if ($app->name != 'anonymous') {
$this->source = $app->name;
}
$appUser = Oauth_application_user::getKV('token', $access_token);
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if (!empty($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 = $this->auth_user;
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$msg = "API OAuth authentication for user '%s' (id: %d) on behalf of " .
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"application '%s' (id: %d) with %s access.";
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'
)
);
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} else {
// TRANS: OAuth exception given when an incorrect access token was given for a user.
throw new OAuthException(_('Bad access token.'));
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}
} 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.'));
}
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} catch (OAuthException $e) {
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$this->logAuthFailure($e->getMessage());
common_log(LOG_WARNING, 'API OAuthException - ' . $e->getMessage());
$this->clientError($e->getMessage(), 401);
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}
}
/**
* 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)
{
$this->basicAuthProcessHeader();
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$realm = common_config('api', 'realm');
if (empty($realm)) {
$realm = common_config('site', 'name') . ' API';
}
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if (empty($this->auth_user_nickname) && $required) {
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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);
} else {
// $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 {
$this->auth_user = null;
}
if ($required && $this->auth_user instanceof User) {
// By default, basic auth users have rw access
$this->access = self::READ_WRITE;
} elseif ($required) {
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$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;
}
}
}
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/**
* Log an API authentication failure. Collect the proxy and IP
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* 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);
}
}