--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/web/lib/Zend/OpenId/Provider.php Fri Mar 11 15:05:35 2011 +0100
@@ -0,0 +1,803 @@
+<?php
+
+/**
+ * Zend Framework
+ *
+ * LICENSE
+ *
+ * This source file is subject to the new BSD license that is bundled
+ * with this package in the file LICENSE.txt.
+ * It is also available through the world-wide-web at this URL:
+ * http://framework.zend.com/license/new-bsd
+ * If you did not receive a copy of the license and are unable to
+ * obtain it through the world-wide-web, please send an email
+ * to license@zend.com so we can send you a copy immediately.
+ *
+ * @category Zend
+ * @package Zend_OpenId
+ * @subpackage Zend_OpenId_Provider
+ * @copyright Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
+ * @license http://framework.zend.com/license/new-bsd New BSD License
+ * @version $Id: Provider.php 23088 2010-10-11 19:53:24Z padraic $
+ */
+
+/**
+ * @see Zend_OpenId
+ */
+require_once "Zend/OpenId.php";
+
+/**
+ * @see Zend_OpenId_Extension
+ */
+require_once "Zend/OpenId/Extension.php";
+
+/**
+ * OpenID provider (server) implementation
+ *
+ * @category Zend
+ * @package Zend_OpenId
+ * @subpackage Zend_OpenId_Provider
+ * @copyright Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
+ * @license http://framework.zend.com/license/new-bsd New BSD License
+ */
+class Zend_OpenId_Provider
+{
+
+ /**
+ * Reference to an implementation of storage object
+ *
+ * @var Zend_OpenId_Provider_Storage $_storage
+ */
+ private $_storage;
+
+ /**
+ * Reference to an implementation of user object
+ *
+ * @var Zend_OpenId_Provider_User $_user
+ */
+ private $_user;
+
+ /**
+ * Time to live of association session in secconds
+ *
+ * @var integer $_sessionTtl
+ */
+ private $_sessionTtl;
+
+ /**
+ * URL to peform interactive user login
+ *
+ * @var string $_loginUrl
+ */
+ private $_loginUrl;
+
+ /**
+ * URL to peform interactive validation of consumer by user
+ *
+ * @var string $_trustUrl
+ */
+ private $_trustUrl;
+
+ /**
+ * The OP Endpoint URL
+ *
+ * @var string $_opEndpoint
+ */
+ private $_opEndpoint;
+
+ /**
+ * Constructs a Zend_OpenId_Provider object with given parameters.
+ *
+ * @param string $loginUrl is an URL that provides login screen for
+ * end-user (by default it is the same URL with additional GET variable
+ * openid.action=login)
+ * @param string $trustUrl is an URL that shows a question if end-user
+ * trust to given consumer (by default it is the same URL with additional
+ * GET variable openid.action=trust)
+ * @param Zend_OpenId_Provider_User $user is an object for communication
+ * with User-Agent and store information about logged-in user (it is a
+ * Zend_OpenId_Provider_User_Session object by default)
+ * @param Zend_OpenId_Provider_Storage $storage is an object for keeping
+ * persistent database (it is a Zend_OpenId_Provider_Storage_File object
+ * by default)
+ * @param integer $sessionTtl is a default time to live for association
+ * session in seconds (1 hour by default). Consumer must reestablish
+ * association after that time.
+ */
+ public function __construct($loginUrl = null,
+ $trustUrl = null,
+ Zend_OpenId_Provider_User $user = null,
+ Zend_OpenId_Provider_Storage $storage = null,
+ $sessionTtl = 3600)
+ {
+ if ($loginUrl === null) {
+ $loginUrl = Zend_OpenId::selfUrl() . '?openid.action=login';
+ } else {
+ $loginUrl = Zend_OpenId::absoluteUrl($loginUrl);
+ }
+ $this->_loginUrl = $loginUrl;
+ if ($trustUrl === null) {
+ $trustUrl = Zend_OpenId::selfUrl() . '?openid.action=trust';
+ } else {
+ $trustUrl = Zend_OpenId::absoluteUrl($trustUrl);
+ }
+ $this->_trustUrl = $trustUrl;
+ if ($user === null) {
+ require_once "Zend/OpenId/Provider/User/Session.php";
+ $this->_user = new Zend_OpenId_Provider_User_Session();
+ } else {
+ $this->_user = $user;
+ }
+ if ($storage === null) {
+ require_once "Zend/OpenId/Provider/Storage/File.php";
+ $this->_storage = new Zend_OpenId_Provider_Storage_File();
+ } else {
+ $this->_storage = $storage;
+ }
+ $this->_sessionTtl = $sessionTtl;
+ }
+
+ /**
+ * Sets the OP Endpoint URL
+ *
+ * @param string $url the OP Endpoint URL
+ * @return null
+ */
+ public function setOpEndpoint($url)
+ {
+ $this->_opEndpoint = $url;
+ }
+
+ /**
+ * Registers a new user with given $id and $password
+ * Returns true in case of success and false if user with given $id already
+ * exists
+ *
+ * @param string $id user identity URL
+ * @param string $password encoded user password
+ * @return bool
+ */
+ public function register($id, $password)
+ {
+ if (!Zend_OpenId::normalize($id) || empty($id)) {
+ return false;
+ }
+ return $this->_storage->addUser($id, md5($id.$password));
+ }
+
+ /**
+ * Returns true if user with given $id exists and false otherwise
+ *
+ * @param string $id user identity URL
+ * @return bool
+ */
+ public function hasUser($id) {
+ if (!Zend_OpenId::normalize($id)) {
+ return false;
+ }
+ return $this->_storage->hasUser($id);
+ }
+
+ /**
+ * Performs login of user with given $id and $password
+ * Returns true in case of success and false otherwise
+ *
+ * @param string $id user identity URL
+ * @param string $password user password
+ * @return bool
+ */
+ public function login($id, $password)
+ {
+ if (!Zend_OpenId::normalize($id)) {
+ return false;
+ }
+ if (!$this->_storage->checkUser($id, md5($id.$password))) {
+ return false;
+ }
+ $this->_user->setLoggedInUser($id);
+ return true;
+ }
+
+ /**
+ * Performs logout. Clears information about logged in user.
+ *
+ * @return void
+ */
+ public function logout()
+ {
+ $this->_user->delLoggedInUser();
+ return true;
+ }
+
+ /**
+ * Returns identity URL of current logged in user or false
+ *
+ * @return mixed
+ */
+ public function getLoggedInUser() {
+ return $this->_user->getLoggedInUser();
+ }
+
+ /**
+ * Retrieve consumer's root URL from request query.
+ * Returns URL or false in case of failure
+ *
+ * @param array $params query arguments
+ * @return mixed
+ */
+ public function getSiteRoot($params)
+ {
+ $version = 1.1;
+ if (isset($params['openid_ns']) &&
+ $params['openid_ns'] == Zend_OpenId::NS_2_0) {
+ $version = 2.0;
+ }
+ if ($version >= 2.0 && isset($params['openid_realm'])) {
+ $root = $params['openid_realm'];
+ } else if ($version < 2.0 && isset($params['openid_trust_root'])) {
+ $root = $params['openid_trust_root'];
+ } else if (isset($params['openid_return_to'])) {
+ $root = $params['openid_return_to'];
+ } else {
+ return false;
+ }
+ if (Zend_OpenId::normalizeUrl($root) && !empty($root)) {
+ return $root;
+ }
+ return false;
+ }
+
+ /**
+ * Allows consumer with given root URL to authenticate current logged
+ * in user. Returns true on success and false on error.
+ *
+ * @param string $root root URL
+ * @param mixed $extensions extension object or array of extensions objects
+ * @return bool
+ */
+ public function allowSite($root, $extensions=null)
+ {
+ $id = $this->getLoggedInUser();
+ if ($id === false) {
+ return false;
+ }
+ if ($extensions !== null) {
+ $data = array();
+ Zend_OpenId_Extension::forAll($extensions, 'getTrustData', $data);
+ } else {
+ $data = true;
+ }
+ $this->_storage->addSite($id, $root, $data);
+ return true;
+ }
+
+ /**
+ * Prohibit consumer with given root URL to authenticate current logged
+ * in user. Returns true on success and false on error.
+ *
+ * @param string $root root URL
+ * @return bool
+ */
+ public function denySite($root)
+ {
+ $id = $this->getLoggedInUser();
+ if ($id === false) {
+ return false;
+ }
+ $this->_storage->addSite($id, $root, false);
+ return true;
+ }
+
+ /**
+ * Delete consumer with given root URL from known sites of current logged
+ * in user. Next time this consumer will try to authenticate the user,
+ * Provider will ask user's confirmation.
+ * Returns true on success and false on error.
+ *
+ * @param string $root root URL
+ * @return bool
+ */
+ public function delSite($root)
+ {
+ $id = $this->getLoggedInUser();
+ if ($id === false) {
+ return false;
+ }
+ $this->_storage->addSite($id, $root, null);
+ return true;
+ }
+
+ /**
+ * Returns list of known consumers for current logged in user or false
+ * if he is not logged in.
+ *
+ * @return mixed
+ */
+ public function getTrustedSites()
+ {
+ $id = $this->getLoggedInUser();
+ if ($id === false) {
+ return false;
+ }
+ return $this->_storage->getTrustedSites($id);
+ }
+
+ /**
+ * Handles HTTP request from consumer
+ *
+ * @param array $params GET or POST variables. If this parameter is omited
+ * or set to null, then $_GET or $_POST superglobal variable is used
+ * according to REQUEST_METHOD.
+ * @param mixed $extensions extension object or array of extensions objects
+ * @param Zend_Controller_Response_Abstract $response an optional response
+ * object to perform HTTP or HTML form redirection
+ * @return mixed
+ */
+ public function handle($params=null, $extensions=null,
+ Zend_Controller_Response_Abstract $response = null)
+ {
+ if ($params === null) {
+ if ($_SERVER["REQUEST_METHOD"] == "GET") {
+ $params = $_GET;
+ } else if ($_SERVER["REQUEST_METHOD"] == "POST") {
+ $params = $_POST;
+ } else {
+ return false;
+ }
+ }
+ $version = 1.1;
+ if (isset($params['openid_ns']) &&
+ $params['openid_ns'] == Zend_OpenId::NS_2_0) {
+ $version = 2.0;
+ }
+ if (isset($params['openid_mode'])) {
+ if ($params['openid_mode'] == 'associate') {
+ $response = $this->_associate($version, $params);
+ $ret = '';
+ foreach ($response as $key => $val) {
+ $ret .= $key . ':' . $val . "\n";
+ }
+ return $ret;
+ } else if ($params['openid_mode'] == 'checkid_immediate') {
+ $ret = $this->_checkId($version, $params, 1, $extensions, $response);
+ if (is_bool($ret)) return $ret;
+ if (!empty($params['openid_return_to'])) {
+ Zend_OpenId::redirect($params['openid_return_to'], $ret, $response);
+ }
+ return true;
+ } else if ($params['openid_mode'] == 'checkid_setup') {
+ $ret = $this->_checkId($version, $params, 0, $extensions, $response);
+ if (is_bool($ret)) return $ret;
+ if (!empty($params['openid_return_to'])) {
+ Zend_OpenId::redirect($params['openid_return_to'], $ret, $response);
+ }
+ return true;
+ } else if ($params['openid_mode'] == 'check_authentication') {
+ $response = $this->_checkAuthentication($version, $params);
+ $ret = '';
+ foreach ($response as $key => $val) {
+ $ret .= $key . ':' . $val . "\n";
+ }
+ return $ret;
+ }
+ }
+ return false;
+ }
+
+ /**
+ * Generates a secret key for given hash function, returns RAW key or false
+ * if function is not supported
+ *
+ * @param string $func hash function (sha1 or sha256)
+ * @return mixed
+ */
+ protected function _genSecret($func)
+ {
+ if ($func == 'sha1') {
+ $macLen = 20; /* 160 bit */
+ } else if ($func == 'sha256') {
+ $macLen = 32; /* 256 bit */
+ } else {
+ return false;
+ }
+ return Zend_OpenId::randomBytes($macLen);
+ }
+
+ /**
+ * Processes association request from OpenID consumerm generates secret
+ * shared key and send it back using Diffie-Hellman encruption.
+ * Returns array of variables to push back to consumer.
+ *
+ * @param float $version OpenID version
+ * @param array $params GET or POST request variables
+ * @return array
+ */
+ protected function _associate($version, $params)
+ {
+ $ret = array();
+
+ if ($version >= 2.0) {
+ $ret['ns'] = Zend_OpenId::NS_2_0;
+ }
+
+ if (isset($params['openid_assoc_type']) &&
+ $params['openid_assoc_type'] == 'HMAC-SHA1') {
+ $macFunc = 'sha1';
+ } else if (isset($params['openid_assoc_type']) &&
+ $params['openid_assoc_type'] == 'HMAC-SHA256' &&
+ $version >= 2.0) {
+ $macFunc = 'sha256';
+ } else {
+ $ret['error'] = 'Wrong "openid.assoc_type"';
+ $ret['error-code'] = 'unsupported-type';
+ return $ret;
+ }
+
+ $ret['assoc_type'] = $params['openid_assoc_type'];
+
+ $secret = $this->_genSecret($macFunc);
+
+ if (empty($params['openid_session_type']) ||
+ $params['openid_session_type'] == 'no-encryption') {
+ $ret['mac_key'] = base64_encode($secret);
+ } else if (isset($params['openid_session_type']) &&
+ $params['openid_session_type'] == 'DH-SHA1') {
+ $dhFunc = 'sha1';
+ } else if (isset($params['openid_session_type']) &&
+ $params['openid_session_type'] == 'DH-SHA256' &&
+ $version >= 2.0) {
+ $dhFunc = 'sha256';
+ } else {
+ $ret['error'] = 'Wrong "openid.session_type"';
+ $ret['error-code'] = 'unsupported-type';
+ return $ret;
+ }
+
+ if (isset($params['openid_session_type'])) {
+ $ret['session_type'] = $params['openid_session_type'];
+ }
+
+ if (isset($dhFunc)) {
+ if (empty($params['openid_dh_consumer_public'])) {
+ $ret['error'] = 'Wrong "openid.dh_consumer_public"';
+ return $ret;
+ }
+ if (empty($params['openid_dh_gen'])) {
+ $g = pack('H*', Zend_OpenId::DH_G);
+ } else {
+ $g = base64_decode($params['openid_dh_gen']);
+ }
+ if (empty($params['openid_dh_modulus'])) {
+ $p = pack('H*', Zend_OpenId::DH_P);
+ } else {
+ $p = base64_decode($params['openid_dh_modulus']);
+ }
+
+ $dh = Zend_OpenId::createDhKey($p, $g);
+ $dh_details = Zend_OpenId::getDhKeyDetails($dh);
+
+ $sec = Zend_OpenId::computeDhSecret(
+ base64_decode($params['openid_dh_consumer_public']), $dh);
+ if ($sec === false) {
+ $ret['error'] = 'Wrong "openid.session_type"';
+ $ret['error-code'] = 'unsupported-type';
+ return $ret;
+ }
+ $sec = Zend_OpenId::digest($dhFunc, $sec);
+ $ret['dh_server_public'] = base64_encode(
+ Zend_OpenId::btwoc($dh_details['pub_key']));
+ $ret['enc_mac_key'] = base64_encode($secret ^ $sec);
+ }
+
+ $handle = uniqid();
+ $expiresIn = $this->_sessionTtl;
+
+ $ret['assoc_handle'] = $handle;
+ $ret['expires_in'] = $expiresIn;
+
+ $this->_storage->addAssociation($handle,
+ $macFunc, $secret, time() + $expiresIn);
+
+ return $ret;
+ }
+
+ /**
+ * Performs authentication (or authentication check).
+ *
+ * @param float $version OpenID version
+ * @param array $params GET or POST request variables
+ * @param bool $immediate enables or disables interaction with user
+ * @param mixed $extensions extension object or array of extensions objects
+ * @param Zend_Controller_Response_Abstract $response
+ * @return array
+ */
+ protected function _checkId($version, $params, $immediate, $extensions=null,
+ Zend_Controller_Response_Abstract $response = null)
+ {
+ $ret = array();
+
+ if ($version >= 2.0) {
+ $ret['openid.ns'] = Zend_OpenId::NS_2_0;
+ }
+ $root = $this->getSiteRoot($params);
+ if ($root === false) {
+ return false;
+ }
+
+ if (isset($params['openid_identity']) &&
+ !$this->_storage->hasUser($params['openid_identity'])) {
+ $ret['openid.mode'] = ($immediate && $version >= 2.0) ? 'setup_needed': 'cancel';
+ return $ret;
+ }
+
+ /* Check if user already logged in into the server */
+ if (!isset($params['openid_identity']) ||
+ $this->_user->getLoggedInUser() !== $params['openid_identity']) {
+ $params2 = array();
+ foreach ($params as $key => $val) {
+ if (strpos($key, 'openid_ns_') === 0) {
+ $key = 'openid.ns.' . substr($key, strlen('openid_ns_'));
+ } else if (strpos($key, 'openid_sreg_') === 0) {
+ $key = 'openid.sreg.' . substr($key, strlen('openid_sreg_'));
+ } else if (strpos($key, 'openid_') === 0) {
+ $key = 'openid.' . substr($key, strlen('openid_'));
+ }
+ $params2[$key] = $val;
+ }
+ if ($immediate) {
+ $params2['openid.mode'] = 'checkid_setup';
+ $ret['openid.mode'] = ($version >= 2.0) ? 'setup_needed': 'id_res';
+ $ret['openid.user_setup_url'] = $this->_loginUrl
+ . (strpos($this->_loginUrl, '?') === false ? '?' : '&')
+ . Zend_OpenId::paramsToQuery($params2);
+ return $ret;
+ } else {
+ /* Redirect to Server Login Screen */
+ Zend_OpenId::redirect($this->_loginUrl, $params2, $response);
+ return true;
+ }
+ }
+
+ if (!Zend_OpenId_Extension::forAll($extensions, 'parseRequest', $params)) {
+ $ret['openid.mode'] = ($immediate && $version >= 2.0) ? 'setup_needed': 'cancel';
+ return $ret;
+ }
+
+ /* Check if user trusts to the consumer */
+ $trusted = null;
+ $sites = $this->_storage->getTrustedSites($params['openid_identity']);
+ if (isset($params['openid_return_to'])) {
+ $root = $params['openid_return_to'];
+ }
+ if (isset($sites[$root])) {
+ $trusted = $sites[$root];
+ } else {
+ foreach ($sites as $site => $t) {
+ if (strpos($root, $site) === 0) {
+ $trusted = $t;
+ break;
+ } else {
+ /* OpenID 2.0 (9.2) check for realm wild-card matching */
+ $n = strpos($site, '://*.');
+ if ($n != false) {
+ $regex = '/^'
+ . preg_quote(substr($site, 0, $n+3), '/')
+ . '[A-Za-z1-9_\.]+?'
+ . preg_quote(substr($site, $n+4), '/')
+ . '/';
+ if (preg_match($regex, $root)) {
+ $trusted = $t;
+ break;
+ }
+ }
+ }
+ }
+ }
+
+ if (is_array($trusted)) {
+ if (!Zend_OpenId_Extension::forAll($extensions, 'checkTrustData', $trusted)) {
+ $trusted = null;
+ }
+ }
+
+ if ($trusted === false) {
+ $ret['openid.mode'] = 'cancel';
+ return $ret;
+ } else if ($trusted === null) {
+ /* Redirect to Server Trust Screen */
+ $params2 = array();
+ foreach ($params as $key => $val) {
+ if (strpos($key, 'openid_ns_') === 0) {
+ $key = 'openid.ns.' . substr($key, strlen('openid_ns_'));
+ } else if (strpos($key, 'openid_sreg_') === 0) {
+ $key = 'openid.sreg.' . substr($key, strlen('openid_sreg_'));
+ } else if (strpos($key, 'openid_') === 0) {
+ $key = 'openid.' . substr($key, strlen('openid_'));
+ }
+ $params2[$key] = $val;
+ }
+ if ($immediate) {
+ $params2['openid.mode'] = 'checkid_setup';
+ $ret['openid.mode'] = ($version >= 2.0) ? 'setup_needed': 'id_res';
+ $ret['openid.user_setup_url'] = $this->_trustUrl
+ . (strpos($this->_trustUrl, '?') === false ? '?' : '&')
+ . Zend_OpenId::paramsToQuery($params2);
+ return $ret;
+ } else {
+ Zend_OpenId::redirect($this->_trustUrl, $params2, $response);
+ return true;
+ }
+ }
+
+ return $this->_respond($version, $ret, $params, $extensions);
+ }
+
+ /**
+ * Perepares information to send back to consumer's authentication request,
+ * signs it using shared secret and send back through HTTP redirection
+ *
+ * @param array $params GET or POST request variables
+ * @param mixed $extensions extension object or array of extensions objects
+ * @param Zend_Controller_Response_Abstract $response an optional response
+ * object to perform HTTP or HTML form redirection
+ * @return bool
+ */
+ public function respondToConsumer($params, $extensions=null,
+ Zend_Controller_Response_Abstract $response = null)
+ {
+ $version = 1.1;
+ if (isset($params['openid_ns']) &&
+ $params['openid_ns'] == Zend_OpenId::NS_2_0) {
+ $version = 2.0;
+ }
+ $ret = array();
+ if ($version >= 2.0) {
+ $ret['openid.ns'] = Zend_OpenId::NS_2_0;
+ }
+ $ret = $this->_respond($version, $ret, $params, $extensions);
+ if (!empty($params['openid_return_to'])) {
+ Zend_OpenId::redirect($params['openid_return_to'], $ret, $response);
+ }
+ return true;
+ }
+
+ /**
+ * Perepares information to send back to consumer's authentication request
+ * and signs it using shared secret.
+ *
+ * @param float $version OpenID protcol version
+ * @param array $ret arguments to be send back to consumer
+ * @param array $params GET or POST request variables
+ * @param mixed $extensions extension object or array of extensions objects
+ * @return array
+ */
+ protected function _respond($version, $ret, $params, $extensions=null)
+ {
+ if (empty($params['openid_assoc_handle']) ||
+ !$this->_storage->getAssociation($params['openid_assoc_handle'],
+ $macFunc, $secret, $expires)) {
+ /* Use dumb mode */
+ if (!empty($params['openid_assoc_handle'])) {
+ $ret['openid.invalidate_handle'] = $params['openid_assoc_handle'];
+ }
+ $macFunc = $version >= 2.0 ? 'sha256' : 'sha1';
+ $secret = $this->_genSecret($macFunc);
+ $handle = uniqid();
+ $expiresIn = $this->_sessionTtl;
+ $this->_storage->addAssociation($handle,
+ $macFunc, $secret, time() + $expiresIn);
+ $ret['openid.assoc_handle'] = $handle;
+ } else {
+ $ret['openid.assoc_handle'] = $params['openid_assoc_handle'];
+ }
+ if (isset($params['openid_return_to'])) {
+ $ret['openid.return_to'] = $params['openid_return_to'];
+ }
+ if (isset($params['openid_claimed_id'])) {
+ $ret['openid.claimed_id'] = $params['openid_claimed_id'];
+ }
+ if (isset($params['openid_identity'])) {
+ $ret['openid.identity'] = $params['openid_identity'];
+ }
+
+ if ($version >= 2.0) {
+ if (!empty($this->_opEndpoint)) {
+ $ret['openid.op_endpoint'] = $this->_opEndpoint;
+ } else {
+ $ret['openid.op_endpoint'] = Zend_OpenId::selfUrl();
+ }
+ }
+ $ret['openid.response_nonce'] = gmdate('Y-m-d\TH:i:s\Z') . uniqid();
+ $ret['openid.mode'] = 'id_res';
+
+ Zend_OpenId_Extension::forAll($extensions, 'prepareResponse', $ret);
+
+ $signed = '';
+ $data = '';
+ foreach ($ret as $key => $val) {
+ if (strpos($key, 'openid.') === 0) {
+ $key = substr($key, strlen('openid.'));
+ if (!empty($signed)) {
+ $signed .= ',';
+ }
+ $signed .= $key;
+ $data .= $key . ':' . $val . "\n";
+ }
+ }
+ $signed .= ',signed';
+ $data .= 'signed:' . $signed . "\n";
+ $ret['openid.signed'] = $signed;
+
+ $ret['openid.sig'] = base64_encode(
+ Zend_OpenId::hashHmac($macFunc, $data, $secret));
+
+ return $ret;
+ }
+
+ /**
+ * Performs authentication validation for dumb consumers
+ * Returns array of variables to push back to consumer.
+ * It MUST contain 'is_valid' variable with value 'true' or 'false'.
+ *
+ * @param float $version OpenID version
+ * @param array $params GET or POST request variables
+ * @return array
+ */
+ protected function _checkAuthentication($version, $params)
+ {
+ $ret = array();
+ if ($version >= 2.0) {
+ $ret['ns'] = Zend_OpenId::NS_2_0;
+ }
+ $ret['openid.mode'] = 'id_res';
+
+ if (empty($params['openid_assoc_handle']) ||
+ empty($params['openid_signed']) ||
+ empty($params['openid_sig']) ||
+ !$this->_storage->getAssociation($params['openid_assoc_handle'],
+ $macFunc, $secret, $expires)) {
+ $ret['is_valid'] = 'false';
+ return $ret;
+ }
+
+ $signed = explode(',', $params['openid_signed']);
+ $data = '';
+ foreach ($signed as $key) {
+ $data .= $key . ':';
+ if ($key == 'mode') {
+ $data .= "id_res\n";
+ } else {
+ $data .= $params['openid_' . strtr($key,'.','_')]."\n";
+ }
+ }
+ if ($this->_secureStringCompare(base64_decode($params['openid_sig']),
+ Zend_OpenId::hashHmac($macFunc, $data, $secret))) {
+ $ret['is_valid'] = 'true';
+ } else {
+ $ret['is_valid'] = 'false';
+ }
+ return $ret;
+ }
+
+ /**
+ * Securely compare two strings for equality while avoided C level memcmp()
+ * optimisations capable of leaking timing information useful to an attacker
+ * attempting to iteratively guess the unknown string (e.g. password) being
+ * compared against.
+ *
+ * @param string $a
+ * @param string $b
+ * @return bool
+ */
+ protected function _secureStringCompare($a, $b)
+ {
+ if (strlen($a) !== strlen($b)) {
+ return false;
+ }
+ $result = 0;
+ for ($i = 0; $i < strlen($a); $i++) {
+ $result |= ord($a[$i]) ^ ord($b[$i]);
+ }
+ return $result == 0;
+ }
+}