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-rw-r--r--library/openid/provider/example-mysql.php194
-rw-r--r--library/openid/provider/example.php53
-rw-r--r--library/openid/provider/provider.php845
3 files changed, 1092 insertions, 0 deletions
diff --git a/library/openid/provider/example-mysql.php b/library/openid/provider/example-mysql.php
new file mode 100644
index 000000000..574e3c811
--- /dev/null
+++ b/library/openid/provider/example-mysql.php
@@ -0,0 +1,194 @@
+<?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
new file mode 100644
index 000000000..b8a4c24a9
--- /dev/null
+++ b/library/openid/provider/example.php
@@ -0,0 +1,53 @@
+<?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
new file mode 100644
index 000000000..03fbe1c81
--- /dev/null
+++ b/library/openid/provider/provider.php
@@ -0,0 +1,845 @@
+<?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();
+ }
+ }
+}