diff options
Diffstat (limited to 'library/openid/provider')
| -rw-r--r-- | library/openid/provider/example-mysql.php | 194 | ||||
| -rw-r--r-- | library/openid/provider/example.php | 53 | ||||
| -rw-r--r-- | library/openid/provider/provider.php | 845 |
3 files changed, 0 insertions, 1092 deletions
diff --git a/library/openid/provider/example-mysql.php b/library/openid/provider/example-mysql.php deleted file mode 100644 index 574e3c811..000000000 --- a/library/openid/provider/example-mysql.php +++ /dev/null @@ -1,194 +0,0 @@ -<?php -/** - * This example shows several things: - * - How a setup interface should look like. - * - How to use a mysql table for authentication - * - How to store associations in mysql table, instead of php sessions. - * - How to store realm authorizations. - * - How to send AX/SREG parameters. - * For the example to work, you need to create the necessary tables: -CREATE TABLE Users ( - id INT NOT NULL auto_increment PRIMARY KEY, - login VARCHAR(32) NOT NULL, - password CHAR(40) NOT NULL, - firstName VARCHAR(32) NOT NULL, - lastName VARCHAR(32) NOT NULL -); - -CREATE TABLE AllowedSites ( - user INT NOT NULL, - realm TEXT NOT NULL, - attributes TEXT NOT NULL, - INDEX(user) -); - -CREATE TABLE Associations ( - id INT NOT NULL PRIMARY KEY, - data TEXT NOT NULL -); - * - * This is only an example. Don't use it in your code as-is. - * It has several security flaws, which you shouldn't copy (like storing plaintext login and password in forms). - * - * This setup could be very easily flooded with many associations, - * since non-private ones aren't automatically deleted. - * You could prevent this by storing a date of association and removing old ones, - * or by setting $this->dh = false; - * However, the latter one would disable stateful mode, unless connecting via HTTPS. - */ -require 'provider.php'; - -mysql_connect(); -mysql_select_db('test'); - -function getUserData($handle=null) -{ - if(isset($_POST['login'],$_POST['password'])) { - $login = mysql_real_escape_string($_POST['login']); - $password = sha1($_POST['password']); - $q = mysql_query("SELECT * FROM Users WHERE login = '$login' AND password = '$password'"); - if($data = mysql_fetch_assoc($q)) { - return $data; - } - if($handle) { - echo 'Wrong login/password.'; - } - } - if($handle) { - ?> - <form action="" method="post"> - <input type="hidden" name="openid.assoc_handle" value="<?php echo $handle?>"> - Login: <input type="text" name="login"><br> - Password: <input type="password" name="password"><br> - <button>Submit</button> - </form> - <?php - die(); - } -} - -class MysqlProvider extends LightOpenIDProvider -{ - private $attrMap = array( - 'namePerson/first' => 'First name', - 'namePerson/last' => 'Last name', - 'namePerson/friendly' => 'Nickname (login)' - ); - - private $attrFieldMap = array( - 'namePerson/first' => 'firstName', - 'namePerson/last' => 'lastName', - 'namePerson/friendly' => 'login' - ); - - function setup($identity, $realm, $assoc_handle, $attributes) - { - $data = getUserData($assoc_handle); - echo '<form action="" method="post">' - . '<input type="hidden" name="openid.assoc_handle" value="' . $assoc_handle . '">' - . '<input type="hidden" name="login" value="' . $_POST['login'] .'">' - . '<input type="hidden" name="password" value="' . $_POST['password'] .'">' - . "<b>$realm</b> wishes to authenticate you."; - if($attributes['required'] || $attributes['optional']) { - echo " It also requests following information (required fields marked with *):" - . '<ul>'; - - foreach($attributes['required'] as $attr) { - if(isset($this->attrMap[$attr])) { - echo '<li>' - . '<input type="checkbox" name="attributes[' . $attr . ']"> ' - . $this->attrMap[$attr] . '(*)</li>'; - } - } - - foreach($attributes['optional'] as $attr) { - if(isset($this->attrMap[$attr])) { - echo '<li>' - . '<input type="checkbox" name="attributes[' . $attr . ']"> ' - . $this->attrMap[$attr] . '</li>'; - } - } - echo '</ul>'; - } - echo '<br>' - . '<button name="once">Allow once</button> ' - . '<button name="always">Always allow</button> ' - . '<button name="cancel">cancel</button> ' - . '</form>'; - } - - function checkid($realm, &$attributes) - { - if(isset($_POST['cancel'])) { - $this->cancel(); - } - - $data = getUserData(); - if(!$data) { - return false; - } - $realm = mysql_real_escape_string($realm); - $q = mysql_query("SELECT attributes FROM AllowedSites WHERE user = '{$data['id']}' AND realm = '$realm'"); - - $attrs = array(); - if($attrs = mysql_fetch_row($q)) { - $attrs = explode(',', $attributes[0]); - } elseif(isset($_POST['attributes'])) { - $attrs = array_keys($_POST['attributes']); - } elseif(!isset($_POST['once']) && !isset($_POST['always'])) { - return false; - } - - $attributes = array(); - foreach($attrs as $attr) { - if(isset($this->attrFieldMap[$attr])) { - $attributes[$attr] = $data[$this->attrFieldMap[$attr]]; - } - } - - if(isset($_POST['always'])) { - $attrs = mysql_real_escape_string(implode(',', array_keys($attributes))); - mysql_query("REPLACE INTO AllowedSites VALUES('{$data['id']}', '$realm', '$attrs')"); - } - - return $this->serverLocation . '?' . $data['login']; - } - - function assoc_handle() - { - # We generate an integer assoc handle, because it's just faster to look up an integer later. - $q = mysql_query("SELECT MAX(id) FROM Associations"); - $result = mysql_fetch_row($q); - return $q[0]+1; - } - - function setAssoc($handle, $data) - { - $data = mysql_real_escape_string(serialize($data)); - mysql_query("REPLACE INTO Associations VALUES('$handle', '$data')"); - } - - function getAssoc($handle) - { - if(!is_numeric($handle)) { - return false; - } - $q = mysql_query("SELECT data FROM Associations WHERE id = '$handle'"); - $data = mysql_fetch_row($q); - if(!$data) { - return false; - } - return unserialize($data[0]); - } - - function delAssoc($handle) - { - if(!is_numeric($handle)) { - return false; - } - mysql_query("DELETE FROM Associations WHERE id = '$handle'"); - } - -} -$op = new MysqlProvider; -$op->server(); diff --git a/library/openid/provider/example.php b/library/openid/provider/example.php deleted file mode 100644 index b8a4c24a9..000000000 --- a/library/openid/provider/example.php +++ /dev/null @@ -1,53 +0,0 @@ -<?php -/** - * This example shows how to create a basic provider usin HTTP Authentication. - * This is only an example. You shouldn't use it as-is in your code. - */ -require 'provider.php'; - -class BasicProvider extends LightOpenIDProvider -{ - public $select_id = true; - public $login = ''; - public $password = ''; - - function __construct() - { - parent::__construct(); - - # If we use select_id, we must disable it for identity pages, - # so that an RP can discover it and get proper data (i.e. without select_id) - if(isset($_GET['id'])) { - $this->select_id = false; - } - } - - function setup($identity, $realm, $assoc_handle, $attributes) - { - header('WWW-Authenticate: Basic realm="' . $this->data['openid_realm'] . '"'); - header('HTTP/1.0 401 Unauthorized'); - } - - function checkid($realm, &$attributes) - { - if(!isset($_SERVER['PHP_AUTH_USER'])) { - return false; - } - - if ($_SERVER['PHP_AUTH_USER'] == $this->login - && $_SERVER['PHP_AUTH_PW'] == $this->password - ) { - # Returning identity - # It can be any url that leads here, or to any other place that hosts - # an XRDS document pointing here. - return $this->serverLocation . '?id=' . $this->login; - } - - return false; - } - -} -$op = new BasicProvider; -$op->login = 'test'; -$op->password = 'test'; -$op->server(); diff --git a/library/openid/provider/provider.php b/library/openid/provider/provider.php deleted file mode 100644 index a1a98d70b..000000000 --- a/library/openid/provider/provider.php +++ /dev/null @@ -1,845 +0,0 @@ -<?php -/** - * Using this class, you can easily set up an OpenID Provider. - * It's independent of LightOpenID class. - * It requires either GMP or BCMath for session encryption, - * but will work without them (although either via SSL, or in stateless mode only). - * Also, it requires PHP >= 5.1.2 - * - * This is an alpha version, using it in production code is not recommended, - * until you are *sure* that it works and is secure. - * - * Please send me messages about your testing results - * (even if successful, so I know that it has been tested). - * Also, if you think there's a way to make it easier to use, tell me -- it's an alpha for a reason. - * Same thing applies to bugs in code, suggestions, - * and everything else you'd like to say about the library. - * - * There's no usage documentation here, see the examples. - * - * @author Mewp - * @copyright Copyright (c) 2010, Mewp - * @license http://www.opensource.org/licenses/mit-license.php MIT - */ -//ini_set('error_log','log'); -abstract class LightOpenIDProvider -{ - # URL-s to XRDS and server location. - public $xrdsLocation, $serverLocation; - - # Should we operate in server, or signon mode? - public $select_id = false; - - # Lifetime of an association. - protected $assoc_lifetime = 600; - - # Variables below are either set automatically, or are constant. - # ----- - # Can we support DH? - protected $dh = true; - protected $ns = 'http://specs.openid.net/auth/2.0'; - protected $data, $assoc; - - # Default DH parameters as defined in the specification. - protected $default_modulus; - protected $default_gen = 'Ag=='; - - # AX <-> SREG transform - protected $ax_to_sreg = array( - 'namePerson/friendly' => 'nickname', - 'contact/email' => 'email', - 'namePerson' => 'fullname', - 'birthDate' => 'dob', - 'person/gender' => 'gender', - 'contact/postalCode/home' => 'postcode', - 'contact/country/home' => 'country', - 'pref/language' => 'language', - 'pref/timezone' => 'timezone', - ); - - # Math - private $add, $mul, $pow, $mod, $div, $powmod; - # ----- - - # ------------------------------------------------------------------------ # - # Functions you probably want to implement when extending the class. - - /** - * Checks whether an user is authenticated. - * The function should determine what fields it wants to send to the RP, - * and put them in the $attributes array. - * @param Array $attributes - * @param String $realm Realm used for authentication. - * @return String OP-local identifier of an authenticated user, or an empty value. - */ - abstract function checkid($realm, &$attributes); - - /** - * Displays an user interface for inputting user's login and password. - * Attributes are always AX field namespaces, with stripped host part. - * For example, the $attributes array may be: - * array( 'required' => array('namePerson/friendly', 'contact/email'), - * 'optional' => array('pref/timezone', 'pref/language') - * @param String $identity Discovered identity string. May be used to extract login, unless using $this->select_id - * @param String $realm Realm used for authentication. - * @param String Association handle. must be sent as openid.assoc_handle in $_GET or $_POST in subsequent requests. - * @param Array User attributes requested by the RP. - */ - abstract function setup($identity, $realm, $assoc_handle, $attributes); - - /** - * Stores an association. - * If you want to use php sessions in your provider code, you have to replace it. - * @param String $handle Association handle -- should be used as a key. - * @param Array $assoc Association data. - */ - protected function setAssoc($handle, $assoc) - { - $oldSession = session_id(); - session_commit(); - session_id($assoc['handle']); - session_start(); - $_SESSION['assoc'] = $assoc; - session_commit(); - if($oldSession) { - session_id($oldSession); - session_start(); - } - } - - /** - * Retreives association data. - * If you want to use php sessions in your provider code, you have to replace it. - * @param String $handle Association handle. - * @return Array Association data. - */ - protected function getAssoc($handle) - { - $oldSession = session_id(); - session_commit(); - session_id($handle); - session_start(); - if(empty($_SESSION['assoc'])) { - return null; - } - return $_SESSION['assoc']; - session_commit(); - if($oldSession) { - session_id($oldSession); - session_start(); - } - } - - /** - * Deletes an association. - * If you want to use php sessions in your provider code, you have to replace it. - * @param String $handle Association handle. - */ - protected function delAssoc($handle) - { - $oldSession = session_id(); - session_commit(); - session_id($handle); - session_start(); - session_destroy(); - if($oldSession) { - session_id($oldSession); - session_start(); - } - } - - # ------------------------------------------------------------------------ # - # Functions that you might want to implement. - - /** - * Redirects the user to an url. - * @param String $location The url that the user will be redirected to. - */ - protected function redirect($location) - { - header('Location: ' . $location); - die(); - } - - /** - * Generates a new association handle. - * @return string - */ - protected function assoc_handle() - { - return sha1(microtime()); - } - - /** - * Generates a random shared secret. - * @return string - */ - protected function shared_secret($hash) - { - $length = 20; - if($hash == 'sha256') { - $length = 256; - } - - $secret = ''; - for($i = 0; $i < $length; $i++) { - $secret .= mt_rand(0,255); - } - - return $secret; - } - - /** - * Generates a private key. - * @param int $length Length of the key. - */ - protected function keygen($length) - { - $key = ''; - for($i = 1; $i < $length; $i++) { - $key .= mt_rand(0,9); - } - $key .= mt_rand(1,9); - - return $key; - } - - # ------------------------------------------------------------------------ # - # Functions that you probably shouldn't touch. - - function __construct() - { - $this->default_modulus = - 'ANz5OguIOXLsDhmYmsWizjEOHTdxfo2Vcbt2I3MYZuYe91ouJ4mLBX+YkcLiemOcPy' - . 'm2CBRYHNOyyjmG0mg3BVd9RcLn5S3IHHoXGHblzqdLFEi/368Ygo79JRnxTkXjgmY0' - . 'rxlJ5bU1zIKaSDuKdiI+XUkKJX8Fvf8W8vsixYOr'; - - $location = (!empty($_SERVER['HTTPS']) ? 'https' : 'http') . '://' - . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI']; - $location = preg_replace('/\?.*/','',$location); - $this->serverLocation = $location; - $location .= (strpos($location, '?') ? '&' : '?') . 'xrds'; - $this->xrdsLocation = $location; - - $this->data = $_GET + $_POST; - - # We choose GMP if avaiable, and bcmath otherwise - if(function_exists('gmp_add')) { - $this->add = 'gmp_add'; - $this->mul = 'gmp_mul'; - $this->pow = 'gmp_pow'; - $this->mod = 'gmp_mod'; - $this->div = 'gmp_div'; - $this->powmod = 'gmp_powm'; - } elseif(function_exists('bcadd')) { - $this->add = 'bcadd'; - $this->mul = 'bcmul'; - $this->pow = 'bcpow'; - $this->mod = 'bcmod'; - $this->div = 'bcdiv'; - $this->powmod = 'bcpowmod'; - } else { - # If neither are avaiable, we can't use DH - $this->dh = false; - } - - # However, we do require the hash functions. - # They should be built-in anyway. - if(!function_exists('hash_algos')) { - $this->dh = false; - } - } - - /** - * Displays an XRDS document, or redirects to it. - * By default, it detects whether it should display or redirect automatically. - * @param bool|null $force When true, always display the document, when false always redirect. - */ - function xrds($force=null) - { - if($force) { - echo $this->xrdsContent(); - die(); - } elseif($force === false) { - header('X-XRDS-Location: '. $this->xrdsLocation); - return; - } - - if (isset($_GET['xrds']) - || (isset($_SERVER['HTTP_ACCEPT']) && strpos($_SERVER['HTTP_ACCEPT'], 'application/xrds+xml') !== false) - ) { - header('Content-Type: application/xrds+xml'); - echo $this->xrdsContent(); - die(); - } - - header('X-XRDS-Location: ' . $this->xrdsLocation); - } - - /** - * Returns the content of the XRDS document - * @return String The XRDS document. - */ - protected function xrdsContent() - { - $lines = array( - '<?xml version="1.0" encoding="UTF-8"?>', - '<xrds:XRDS xmlns:xrds="xri://$xrds" xmlns="xri://$xrd*($v*2.0)">', - '<XRD>', - ' <Service>', - ' <Type>' . $this->ns . '/' . ($this->select_id ? 'server' : 'signon') .'</Type>', - ' <URI>' . $this->serverLocation . '</URI>', - ' </Service>', - '</XRD>', - '</xrds:XRDS>' - ); - return implode("\n", $lines); - } - - /** - * Does everything that a provider has to -- in one function. - */ - function server() - { - if(isset($this->data['openid_assoc_handle'])) { - $this->assoc = $this->getAssoc($this->data['openid_assoc_handle']); - if(isset($this->assoc['data'])) { - # We have additional data stored for setup. - $this->data += $this->assoc['data']; - unset($this->assoc['data']); - } - } - - if (isset($this->data['openid_ns']) - && $this->data['openid_ns'] == $this->ns - ) { - if(!isset($this->data['openid_mode'])) $this->errorResponse(); - - switch($this->data['openid_mode']) - { - case 'checkid_immediate': - case 'checkid_setup': - $this->checkRealm(); - # We support AX xor SREG. - $attributes = $this->ax(); - if(!$attributes) { - $attributes = $this->sreg(); - } - - # Even if some user is authenticated, we need to know if it's - # the same one that want's to authenticate. - # Of course, if we use select_id, we accept any user. - if (($identity = $this->checkid($this->data['openid_realm'], $attrValues)) - && ($this->select_id || $identity == $this->data['openid_identity']) - ) { - $this->positiveResponse($identity, $attrValues); - } elseif($this->data['openid_mode'] == 'checkid_immediate') { - $this->redirect($this->response(array('openid.mode' => 'setup_needed'))); - } else { - if(!$this->assoc) { - $this->generateAssociation(); - $this->assoc['private'] = true; - } - $this->assoc['data'] = $this->data; - $this->setAssoc($this->assoc['handle'], $this->assoc); - $this->setup($this->data['openid_identity'], - $this->data['openid_realm'], - $this->assoc['handle'], - $attributes); - } - break; - case 'associate': - $this->associate(); - break; - case 'check_authentication': - $this->checkRealm(); - if($this->verify()) { - echo "ns:$this->ns\nis_valid:true"; - if(strpos($this->data['openid_signed'],'invalidate_handle') !== false) { - echo "\ninvalidate_handle:" . $this->data['openid_invalidate_handle']; - } - } else { - echo "ns:$this->ns\nis_valid:false"; - } - die(); - break; - default: - $this->errorResponse(); - } - } else { - $this->xrds(); - } - } - - protected function checkRealm() - { - if (!isset($this->data['openid_return_to'], $this->data['openid_realm'])) { - $this->errorResponse(); - } - - $realm = str_replace('\*', '[^/]', preg_quote($this->data['openid_realm'])); - if(!preg_match("#^$realm#", $this->data['openid_return_to'])) { - $this->errorResponse(); - } - } - - protected function ax() - { - # Namespace prefix that the fields must have. - $ns = 'http://axschema.org/'; - - # First, we must find out what alias is used for AX. - # Let's check the most likely one - $alias = null; - if (isset($this->data['openid_ns_ax']) - && $this->data['openid_ns_ax'] == 'http://openid.net/srv/ax/1.0' - ) { - $alias = 'ax'; - } else { - foreach($this->data as $name => $value) { - if ($value == 'http://openid.net/srv/ax/1.0' - && preg_match('/openid_ns_(.+)/', $name, $m) - ) { - $alias = $m[1]; - break; - } - } - } - - if(!$alias) { - return null; - } - - $fields = array(); - # Now, we must search again, this time for field aliases - foreach($this->data as $name => $value) { - if (strpos($name, 'openid_' . $alias . '_type') === false - || strpos($value, $ns) === false) { - continue; - } - - $name = substr($name, strlen('openid_' . $alias . '_type_')); - $value = substr($value, strlen($ns)); - - $fields[$name] = $value; - } - - # Then, we find out what fields are required and optional - $required = array(); - $if_available = array(); - foreach(array('required','if_available') as $type) { - if(empty($this->data["openid_{$alias}_{$type}"])) { - continue; - } - $attributes = explode(',', $this->data["openid_{$alias}_{$type}"]); - foreach($attributes as $attr) { - if(empty($fields[$attr])) { - # There is an undefined field here, so we ignore it. - continue; - } - - ${$type}[] = $fields[$attr]; - } - } - - $this->data['ax'] = true; - return array('required' => $required, 'optional' => $if_available); - } - - protected function sreg() - { - $sreg_to_ax = array_flip($this->ax_to_sreg); - - $attributes = array('required' => array(), 'optional' => array()); - - if (empty($this->data['openid_sreg_required']) - && empty($this->data['openid_sreg_optional']) - ) { - return $attributes; - } - - foreach(array('required', 'optional') as $type) { - foreach(explode(',',$this->data['openid_sreg_' . $type]) as $attr) { - if(empty($sreg_to_ax[$attr])) { - # Undefined attribute in SREG request. - # Shouldn't happen, but we check anyway. - continue; - } - - $attributes[$type][] = $sreg_to_ax[$attr]; - } - } - - return $attributes; - } - - /** - * Aids an RP in assertion verification. - * @return bool Information whether the verification suceeded. - */ - protected function verify() - { - # Firstly, we need to make sure that there's an association. - # Otherwise the verification will fail, - # because we've signed assoc_handle in the assertion - if(empty($this->assoc)) { - return false; - } - - # Next, we check that it's a private association, - # i.e. one made without RP input. - # Otherwise, the RP shouldn't ask us to verify. - if(empty($this->assoc['private'])) { - return false; - } - - # Now we have to check if the nonce is correct, to prevent replay attacks. - if($this->data['openid_response_nonce'] != $this->assoc['nonce']) { - return false; - } - - # Getting the signed fields for signature. - $sig = array(); - $signed = explode(',', $this->data['openid_signed']); - foreach($signed as $field) { - $name = strtr($field, '.', '_'); - if(!isset($this->data['openid_' . $name])) { - return false; - } - - $sig[$field] = $this->data['openid_' . $name]; - } - - # Computing the signature and checking if it matches. - $sig = $this->keyValueForm($sig); - if ($this->data['openid_sig'] != - base64_encode(hash_hmac($this->assoc['hash'], $sig, $this->assoc['mac'], true)) - ) { - return false; - } - - # Clearing the nonce, so that it won't be used again. - $this->assoc['nonce'] = null; - - if(empty($this->assoc['private'])) { - # Commiting changes to the association. - $this->setAssoc($this->assoc['handle'], $this->assoc); - } else { - # Private associations shouldn't be used again, se we can as well delete them. - $this->delAssoc($this->assoc['handle']); - } - - # Nothing has failed, so the verification was a success. - return true; - } - - /** - * Performs association with an RP. - */ - protected function associate() - { - # Rejecting no-encryption without TLS. - if(empty($_SERVER['HTTPS']) && $this->data['openid_session_type'] == 'no-encryption') { - $this->directErrorResponse(); - } - - # Checking whether we support DH at all. - if (!$this->dh && substr($this->data['openid_session_type'], 0, 2) == 'DH') { - $this->redirect($this->response(array( - 'openid.error' => 'DH not supported', - 'openid.error_code' => 'unsupported-type', - 'openid.session_type' => 'no-encryption' - ))); - } - - # Creating the association - $this->assoc = array(); - $this->assoc['hash'] = $this->data['openid_assoc_type'] == 'HMAC-SHA256' ? 'sha256' : 'sha1'; - $this->assoc['handle'] = $this->assoc_handle(); - - # Getting the shared secret - if($this->data['openid_session_type'] == 'no-encryption') { - $this->assoc['mac'] = base64_encode($this->shared_secret($this->assoc['hash'])); - } else { - $this->dh(); - } - - # Preparing the direct response... - $response = array( - 'ns' => $this->ns, - 'assoc_handle' => $this->assoc['handle'], - 'assoc_type' => $this->data['openid_assoc_type'], - 'session_type' => $this->data['openid_session_type'], - 'expires_in' => $this->assoc_lifetime - ); - - if(isset($this->assoc['dh_server_public'])) { - $response['dh_server_public'] = $this->assoc['dh_server_public']; - $response['enc_mac_key'] = $this->assoc['mac']; - } else { - $response['mac_key'] = $this->assoc['mac']; - } - - # ...and sending it. - echo $this->keyValueForm($response); - die(); - } - - /** - * Creates a private association. - */ - protected function generateAssociation() - { - $this->assoc = array(); - # We use sha1 by default. - $this->assoc['hash'] = 'sha1'; - $this->assoc['mac'] = $this->shared_secret('sha1'); - $this->assoc['handle'] = $this->assoc_handle(); - } - - /** - * Encrypts the MAC key using DH key exchange. - */ - protected function dh() - { - if(empty($this->data['openid_dh_modulus'])) { - $this->data['openid_dh_modulus'] = $this->default_modulus; - } - - if(empty($this->data['openid_dh_gen'])) { - $this->data['openid_dh_gen'] = $this->default_gen; - } - - if(empty($this->data['openid_dh_consumer_public'])) { - $this->directErrorResponse(); - } - - $modulus = $this->b64dec($this->data['openid_dh_modulus']); - $gen = $this->b64dec($this->data['openid_dh_gen']); - $consumerKey = $this->b64dec($this->data['openid_dh_consumer_public']); - - $privateKey = $this->keygen(strlen($modulus)); - $publicKey = $this->powmod($gen, $privateKey, $modulus); - $ss = $this->powmod($consumerKey, $privateKey, $modulus); - - $mac = $this->x_or(hash($this->assoc['hash'], $ss, true), $this->shared_secret($this->assoc['hash'])); - $this->assoc['dh_server_public'] = $this->decb64($publicKey); - $this->assoc['mac'] = base64_encode($mac); - } - - /** - * XORs two strings. - * @param String $a - * @param String $b - * @return String $a ^ $b - */ - protected function x_or($a, $b) - { - $length = strlen($a); - for($i = 0; $i < $length; $i++) { - $a[$i] = $a[$i] ^ $b[$i]; - } - - return $a; - } - - /** - * Prepares an indirect response url. - * @param array $params Parameters to be sent. - */ - protected function response($params) - { - $params += array('openid.ns' => $this->ns); - return $this->data['openid_return_to'] - . (strpos($this->data['openid_return_to'],'?') ? '&' : '?') - . http_build_query($params, '', '&'); - } - - /** - * Outputs a direct error. - */ - protected function errorResponse() - { - if(!empty($this->data['openid_return_to'])) { - $response = array( - 'openid.mode' => 'error', - 'openid.error' => 'Invalid request' - ); - $this->redirect($this->response($response)); - } else { - header('HTTP/1.1 400 Bad Request'); - $response = array( - 'ns' => $this->ns, - 'error' => 'Invalid request' - ); - echo $this->keyValueForm($response); - } - die(); - } - - /** - * Sends an positive assertion. - * @param String $identity the OP-Local Identifier that is being authenticated. - * @param Array $attributes User attributes to be sent. - */ - protected function positiveResponse($identity, $attributes) - { - # We generate a private association if there is none established. - if(!$this->assoc) { - $this->generateAssociation(); - $this->assoc['private'] = true; - } - - # We set openid.identity (and openid.claimed_id if necessary) to our $identity - if($this->data['openid_identity'] == $this->data['openid_claimed_id'] || $this->select_id) { - $this->data['openid_claimed_id'] = $identity; - } - $this->data['openid_identity'] = $identity; - - # Preparing fields to be signed - $params = array( - 'op_endpoint' => $this->serverLocation, - 'claimed_id' => $this->data['openid_claimed_id'], - 'identity' => $this->data['openid_identity'], - 'return_to' => $this->data['openid_return_to'], - 'realm' => $this->data['openid_realm'], - 'response_nonce' => gmdate("Y-m-d\TH:i:s\Z"), - 'assoc_handle' => $this->assoc['handle'], - ); - - $params += $this->responseAttributes($attributes); - - # Has the RP used an invalid association handle? - if (isset($this->data['openid_assoc_handle']) - && $this->data['openid_assoc_handle'] != $this->assoc['handle'] - ) { - $params['invalidate_handle'] = $this->data['openid_assoc_handle']; - } - - # Signing the $params - $sig = hash_hmac($this->assoc['hash'], $this->keyValueForm($params), $this->assoc['mac'], true); - $req = array( - 'openid.mode' => 'id_res', - 'openid.signed' => implode(',', array_keys($params)), - 'openid.sig' => base64_encode($sig), - ); - - # Saving the nonce and commiting the association. - $this->assoc['nonce'] = $params['response_nonce']; - $this->setAssoc($this->assoc['handle'], $this->assoc); - - # Preparing and sending the response itself - foreach($params as $name => $value) { - $req['openid.' . $name] = $value; - } - - $this->redirect($this->response($req)); - } - - /** - * Prepares an array of attributes to send - */ - protected function responseAttributes($attributes) - { - if(!$attributes) return array(); - - $ns = 'http://axschema.org/'; - - $response = array(); - if(isset($this->data['ax'])) { - $response['ns.ax'] = 'http://openid.net/srv/ax/1.0'; - foreach($attributes as $name => $value) { - $alias = strtr($name, '/', '_'); - $response['ax.type.' . $alias] = $ns . $name; - $response['ax.value.' . $alias] = $value; - } - return $response; - } - - foreach($attributes as $name => $value) { - if(!isset($this->ax_to_sreg[$name])) { - continue; - } - - $response['sreg.' . $this->ax_to_sreg[$name]] = $value; - } - return $response; - } - - /** - * Encodes fields in key-value form. - * @param Array $params Fields to be encoded. - * @return String $params in key-value form. - */ - protected function keyValueForm($params) - { - $str = ''; - foreach($params as $name => $value) { - $str .= "$name:$value\n"; - } - - return $str; - } - - /** - * Responds with an information that the user has canceled authentication. - */ - protected function cancel() - { - $this->redirect($this->response(array('openid.mode' => 'cancel'))); - } - - /** - * Converts base64 encoded number to it's decimal representation. - * @param String $str base64 encoded number. - * @return String Decimal representation of that number. - */ - protected function b64dec($str) - { - $bytes = unpack('C*', base64_decode($str)); - $n = 0; - foreach($bytes as $byte) { - $n = $this->add($this->mul($n, 256), $byte); - } - - return $n; - } - - /** - * Complements b64dec. - */ - protected function decb64($num) - { - $bytes = array(); - while($num) { - array_unshift($bytes, $this->mod($num, 256)); - $num = $this->div($num, 256); - } - - if($bytes && $bytes[0] > 127) { - array_unshift($bytes,0); - } - - array_unshift($bytes, 'C*'); - - return base64_encode(call_user_func_array('pack', $bytes)); - } - - function __call($name, $args) - { - switch($name) { - case 'add': - case 'mul': - case 'pow': - case 'mod': - case 'div': - case 'powmod': - if(function_exists('gmp_strval')) { - return gmp_strval(call_user_func_array($this->$name, $args)); - } - return call_user_func_array($this->$name, $args); - default: - throw new BadMethodCallException(); - } - } -} |