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<?php

/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4 foldmethod=marker: */

/**

 * The main include file for Auth package

 *

 * PHP versions 4 and 5

 *

 * LICENSE: This source file is subject to version 3.01 of the PHP license

 * that is available through the world-wide-web at the following URI:

 * http://www.php.net/license/3_01.txt.  If you did not receive a copy of

 * the PHP License and are unable to obtain it through the web, please

 * send a note to license@php.net so we can mail you a copy immediately.

 *

 * @category   Authentication

 * @package    Auth

 * @author     Martin Jansen <mj@php.net>

 * @author     Adam Ashley <aashley@php.net>

 * @copyright  2001-2006 The PHP Group

 * @license    http://www.php.net/license/3_01.txt  PHP License 3.01

 * @version    CVS: $Id: Auth.php,v 1.119 2007/07/02 03:38:52 aashley Exp $

 * @link       http://pear.php.net/package/Auth

 */

/**

 * Returned if session exceeds idle time

 */

define('AUTH_IDLED',                    -1);

/**

 * Returned if session has expired

 */

define('AUTH_EXPIRED',                  -2);

/**

 * Returned if container is unable to authenticate user/password pair

 */

define('AUTH_WRONG_LOGIN',              -3);

/**

 * Returned if a container method is not supported.

 */

define('AUTH_METHOD_NOT_SUPPORTED',     -4);

/**

 * Returned if new Advanced security system detects a breach

 */

define('AUTH_SECURITY_BREACH',          -5);

/**

 * Returned if checkAuthCallback says session should not continue.

 */

define('AUTH_CALLBACK_ABORT',           -6);

/**

 * Auth Log level - INFO

 */

define('AUTH_LOG_INFO',     6);

/**

 * Auth Log level - DEBUG

 */

define('AUTH_LOG_DEBUG',    7);

/**

 * PEAR::Auth

 *

 * The PEAR::Auth class provides methods for creating an

 * authentication system using PHP.

 *

 * @category   Authentication

 * @package    Auth

 * @author     Martin Jansen <mj@php.net>

 * @author     Adam Ashley <aashley@php.net>

 * @copyright  2001-2006 The PHP Group

 * @license    http://www.php.net/license/3_01.txt  PHP License 3.01

 * @version    Release: 1.5.4  File: $Revision: 1.119 $

 * @link       http://pear.php.net/package/Auth

 */

class Auth {

    // {{{ properties

    /**

     * Auth lifetime in seconds

     *

     * If this variable is set to 0, auth never expires

     *

     * @var  integer

     * @see  setExpire(), checkAuth()

     */

    var $expire = 0;

    /**

     * Has the auth session expired?

     *

     * @var   bool

     * @see   checkAuth()

     */

    var $expired = false;

    /**

     * Maximum idletime in seconds

     *

     * The difference to $expire is, that the idletime gets

     * refreshed each time checkAuth() is called. If this

     * variable is set to 0, idletime is never checked.

     *

     * @var integer

     * @see setIdle(), checkAuth()

     */

    var $idle = 0;

    /**

     * Is the maximum idletime over?

     *

     * @var boolean

     * @see checkAuth()

     */

    var $idled = false;

    /**

     * Storage object

     *

     * @var object

     * @see Auth(), validateLogin()

     */

    var $storage = '';

    /**

     * User-defined function that creates the login screen

     *

     * @var string

     */

    var $loginFunction = '';

    /**

     * Should the login form be displayed

     *

     * @var   bool

     * @see   setShowlogin()

     */

    var $showLogin = true;

    /**

      * Is Login Allowed from this page

      *

      * @var  bool

      * @see setAllowLogin

      */

    var $allowLogin = true;

    /**

     * Current authentication status

     *

     * @var string

     */

    var $status = '';

    /**

     * Username

     *

     * @var string

     */

    var $username = '';

    /**

     * Password

     *

     * @var string

     */

    var $password = '';

    /**

     * checkAuth callback function name

     *

     * @var string

     * @see setCheckAuthCallback()

     */

    var $checkAuthCallback = '';

    /**

     * Login callback function name

     *

     * @var string

     * @see setLoginCallback()

     */

    var $loginCallback = '';

    /**

     * Failed Login callback function name

     *

     * @var string

     * @see setFailedLoginCallback()

     */

    var $loginFailedCallback = '';

    /**

     * Logout callback function name

     *

     * @var string

     * @see setLogoutCallback()

     */

    var $logoutCallback = '';

    /**

     * Auth session-array name

     *

     * @var string

     */

    var $_sessionName = '_authsession';

    /**

     * Package Version

     *

     * @var string

     */

    var $version = "@version@";

    /**

     * Flag to use advanced security

     * When set extra checks will be made to see if the

     * user's IP or useragent have changed across requests.

     * Turned off by default to preserve BC.

     *

     * @var boolean

     */

    var $advancedsecurity = false;

    /**

     * Username key in POST array

     *

     * @var string

     */

    var $_postUsername = 'username';

    /**

     * Password key in POST array

     *

     * @var string

     */

    var $_postPassword = 'password';

    /**

     * Holds a reference to the session auth variable

     * @var array

     */

    var $session;

    /**

     * Holds a reference to the global server variable

     * @var array

     */

    var $server;

    /**

     * Holds a reference to the global post variable

     * @var array

     */

    var $post;

    /**

     * Holds a reference to the global cookie variable

     * @var array

     */

    var $cookie;

    /**

     * A hash to hold various superglobals as reference

     * @var array

     */

    var $authdata;

    /**

      * How many times has checkAuth been called

      * @var int

      */

    var $authChecks = 0;

    /**

     * PEAR::Log object

     *

     * @var object Log

     */

    var $logger = null;

    /**

     * Whether to enable logging of behaviour

     *

     * @var boolean

     */

    var $enableLogging = false;

    /**

     * Whether to regenerate session id everytime start is called

     *

     * @var boolean

     */

    var $regenerateSessionId = false;

    // }}}

    // {{{ Auth() [constructor]

    /**

     * Constructor

     *

     * Set up the storage driver.

     *

     * @param string    Type of the storage driver

     * @param mixed     Additional options for the storage driver

     *                  (example: if you are using DB as the storage

     *                   driver, you have to pass the dsn string here)

     *

     * @param string    Name of the function that creates the login form

     * @param boolean   Should the login form be displayed if neccessary?

     * @return void

     */

    function Auth($storageDriver, $options = '', $loginFunction = '', $showLogin = true)

    {

        $this->applyAuthOptions($options);

        // Start the session suppress error if already started

        if(!session_id()){

            @session_start();

            if(!session_id()) {

                // Throw error

                include_once 'PEAR.php';

                PEAR::throwError('Session could not be started by Auth, '

                        .'possibly headers are already sent, try putting '

                        .'ob_start in the beginning of your script');

            }

        }

        // Make Sure Auth session variable is there

        if(!isset($_SESSION[$this->_sessionName])) {

            $_SESSION[$this->_sessionName] = array();

        }

        // Assign Some globals to internal references, this will replace _importGlobalVariable

        $this->session =& $_SESSION[$this->_sessionName];

        $this->server =& $_SERVER;

        $this->post =& $_POST;

        $this->cookie =& $_COOKIE;

        if ($loginFunction != '' && is_callable($loginFunction)) {

            $this->loginFunction = $loginFunction;

        }

        if (is_bool($showLogin)) {

            $this->showLogin = $showLogin;

        }

        if (is_object($storageDriver)) {

            $this->storage =& $storageDriver;

            // Pass a reference to auth to the container, ugly but works

            // this is used by the DB container to use method setAuthData not staticaly.

            $this->storage->_auth_obj =& $this;

        } else {

            // $this->storage = $this->_factory($storageDriver, $options);

            //

            $this->storage_driver = $storageDriver;

            $this->storage_options =& $options;

        }

    }

    // }}}

    // {{{ applyAuthOptions()

    /**

      * Set the Auth options

      *

      * Some options which are Auth specific will be applied

      * the rest will be left for usage by the container

      *

      * @param array    An array of Auth options

      * @return array   The options which were not applied

      * @access private

      */

    function &applyAuthOptions(&$options)

    {

        if(is_array($options)){

            if (!empty($options['sessionName'])) {

                $this->_sessionName = $options['sessionName'];

                unset($options['sessionName']);

            }

            if (isset($options['allowLogin'])) {

                $this->allowLogin = $options['allowLogin'];

                unset($options['allowLogin']);

            }

            if (!empty($options['postUsername'])) {

                $this->_postUsername = $options['postUsername'];

                unset($options['postUsername']);

            }

            if (!empty($options['postPassword'])) {

                $this->_postPassword = $options['postPassword'];

                unset($options['postPassword']);

            }

            if (isset($options['advancedsecurity'])) {

                $this->advancedsecurity = $options['advancedsecurity'];

                unset($options['advancedsecurity']);

            }

            if (isset($options['enableLogging'])) {

                $this->enableLogging = $options['enableLogging'];

                unset($options['enableLogging']);

            }

            if (isset($options['regenerateSessionId']) && is_bool($options['regenerateSessionId'])) {

                $this->regenerateSessionId = $options['regenerateSessionId'];

            }

        }

        return($options);

    }

    // }}}

    // {{{ _loadStorage()

    /**

      * Load Storage Driver if not already loaded

      *

      * Suspend storage instantiation to make Auth lighter to use

      * for calls which do not require login

      *

      * @return bool    True if the conainer is loaded, false if the container

      *                 is already loaded

      * @access private

      */

    function _loadStorage()

    {

        if(!is_object($this->storage)) {

            $this->storage =& $this->_factory($this->storage_driver,

                    $this->storage_options);

            $this->storage->_auth_obj =& $this;

            $this->log('Loaded storage container ('.$this->storage_driver.')', AUTH_LOG_DEBUG);

            return(true);

        }

        return(false);

    }

    // }}}

    // {{{ _factory()

    /**

     * Return a storage driver based on $driver and $options

     *

     * @static

     * @param  string $driver  Type of storage class to return

     * @param  string $options Optional parameters for the storage class

     * @return object Object   Storage object

     * @access private

     */

    function &_factory($driver, $options = '')

    {

        $storage_class = 'Auth_Container_' . $driver;

        include_once 'Auth/Container/' . $driver . '.php';

        $obj =& new $storage_class($options);

        return $obj;

    }

    // }}}

    // {{{ assignData()

    /**

     * Assign data from login form to internal values

     *

     * This function takes the values for username and password

     * from $HTTP_POST_VARS/$_POST and assigns them to internal variables.

     * If you wish to use another source apart from $HTTP_POST_VARS/$_POST,

     * you have to derive this function.

     *

     * @global $HTTP_POST_VARS, $_POST

     * @see    Auth

     * @return void

     * @access private

     */

    function assignData()

    {

        $this->log('Auth::assignData() called.', AUTH_LOG_DEBUG);

        if (   isset($this->post[$this->_postUsername])

            && $this->post[$this->_postUsername] != '') {

            $this->username = (get_magic_quotes_gpc() == 1

                    ? stripslashes($this->post[$this->_postUsername])

                    : $this->post[$this->_postUsername]);

        }

        if (   isset($this->post[$this->_postPassword])

            && $this->post[$this->_postPassword] != '') {

            $this->password = (get_magic_quotes_gpc() == 1

                    ? stripslashes($this->post[$this->_postPassword])

                    : $this->post[$this->_postPassword] );

        }

    }

    // }}}

    // {{{ start()

    /**

     * Start new auth session

     *

     * @return void

     * @access public

     */

    function start()

    {

        $this->log('Auth::start() called.', AUTH_LOG_DEBUG);

        // #10729 - Regenerate session id here if we are generating it on every

        //          page load.

        if ($this->regenerateSessionId) {

            session_regenerate_id(true);

        }

        $this->assignData();

        if (!$this->checkAuth() && $this->allowLogin) {

            $this->login();

        }

    }

    // }}}

    // {{{ login()

    /**

     * Login function

     *

     * @return void

     * @access private

     */

    function login()

    {

        $this->log('Auth::login() called.', AUTH_LOG_DEBUG);

        $login_ok = false;

        $this->_loadStorage();

        // Check if using challenge response

        (isset($this->post['authsecret']) && $this->post['authsecret'] == 1)

            ? $usingChap = true

            : $usingChap = false;

        // When the user has already entered a username, we have to validate it.

        if (!empty($this->username)) {

            if (true === $this->storage->fetchData($this->username, $this->password, $usingChap)) {

                $this->session['challengekey'] = md5($this->username.$this->password);

                $login_ok = true;

                $this->log('Successful login.', AUTH_LOG_INFO);

            }

        }

        if (!empty($this->username) && $login_ok) {

            $this->setAuth($this->username);

            if (is_callable($this->loginCallback)) {

                $this->log('Calling loginCallback ('.$this->loginCallback.').', AUTH_LOG_DEBUG);

                call_user_func_array($this->loginCallback, array($this->username, &$this));

            }

        }

        // If the login failed or the user entered no username,

        // output the login screen again.

        if (!empty($this->username) && !$login_ok) {

            $this->log('Incorrect login.', AUTH_LOG_INFO);

            $this->status = AUTH_WRONG_LOGIN;

            if (is_callable($this->loginFailedCallback)) {

                $this->log('Calling loginFailedCallback ('.$this->loginFailedCallback.').', AUTH_LOG_DEBUG);

                call_user_func_array($this->loginFailedCallback, array($this->username, &$this));

            }

        }

        if ((empty($this->username) || !$login_ok) && $this->showLogin) {

            $this->log('Rendering Login Form.', AUTH_LOG_INFO);

            if (is_callable($this->loginFunction)) {

                $this->log('Calling loginFunction ('.$this->loginFunction.').', AUTH_LOG_DEBUG);

                call_user_func_array($this->loginFunction, array($this->username, $this->status, &$this));

            } else {

                // BC fix Auth used to use drawLogin for this

                // call is sub classes implement this

                if (is_callable(array($this, 'drawLogin'))) {

                    $this->log('Calling Auth::drawLogin()', AUTH_LOG_DEBUG);

                    return $this->drawLogin($this->username, $this);

                }

                $this->log('Using default Auth_Frontend_Html', AUTH_LOG_DEBUG);

                // New Login form

                include_once 'Auth/Frontend/Html.php';

                return Auth_Frontend_Html::render($this, $this->username);

            }

        } else {

            return;

        }

    }

    // }}}

    // {{{ setExpire()

    /**

     * Set the maximum expire time

     *

     * @param  integer time in seconds

     * @param  bool    add time to current expire time or not

     * @return void

     * @access public

     */

    function setExpire($time, $add = false)

    {

        $add ? $this->expire += $time : $this->expire = $time;

    }

    // }}}

    // {{{ setIdle()

    /**

     * Set the maximum idle time

     *

     * @param  integer time in seconds

     * @param  bool    add time to current maximum idle time or not

     * @return void

     * @access public

     */

    function setIdle($time, $add = false)

    {

        $add ? $this->idle += $time : $this->idle = $time;

    }

    // }}}

    // {{{ setSessionName()

    /**

     * Set name of the session to a customized value.

     *

     * If you are using multiple instances of PEAR::Auth

     * on the same domain, you can change the name of

     * session per application via this function.

     * This will chnage the name of the session variable

     * auth uses to store it's data in the session

     *

     * @param  string New name for the session

     * @return void

     * @access public

     */

    function setSessionName($name = 'session')

    {

        $this->_sessionName = '_auth_'.$name;

        // Make Sure Auth session variable is there

        if(!isset($_SESSION[$this->_sessionName])) {

            $_SESSION[$this->_sessionName] = array();

        }

        $this->session =& $_SESSION[$this->_sessionName];

    }

    // }}}

    // {{{ setShowLogin()

    /**

     * Should the login form be displayed if neccessary?

     *

     * @param  bool    show login form or not

     * @return void

     * @access public

     */

    function setShowLogin($showLogin = true)

    {

        $this->showLogin = $showLogin;

    }

    // }}}

    // {{{ setAllowLogin()

    /**

     * Should the login form be displayed if neccessary?

     *

     * @param  bool    show login form or not

     * @return void

     * @access public

     */

    function setAllowLogin($allowLogin = true)

    {

        $this->allowLogin = $allowLogin;

    }

    // }}}

    // {{{ setCheckAuthCallback()

    /**

     * Register a callback function to be called whenever the validity of the login is checked

     * The function will receive two parameters, the username and a reference to the auth object.

     *

     * @param  string  callback function name

     * @return void

     * @access public

     * @since Method available since Release 1.4.3

     */

    function setCheckAuthCallback($checkAuthCallback)

    {

        $this->checkAuthCallback = $checkAuthCallback;

    }

    // }}}

    // {{{ setLoginCallback()

    /**

     * Register a callback function to be called on user login.

     * The function will receive two parameters, the username and a reference to the auth object.

     *

     * @param  string  callback function name

     * @return void

     * @see    setLogoutCallback()

     * @access public

     */

    function setLoginCallback($loginCallback)

    {

        $this->loginCallback = $loginCallback;

    }

    // }}}

    // {{{ setFailedLoginCallback()

    /**

     * Register a callback function to be called on failed user login.

     * The function will receive two parameters, the username and a reference to the auth object.

     *

     * @param  string  callback function name

     * @return void

     * @access public

     */

    function setFailedLoginCallback($loginFailedCallback)

    {

        $this->loginFailedCallback = $loginFailedCallback;

    }

    // }}}

    // {{{ setLogoutCallback()

    /**

     * Register a callback function to be called on user logout.

     * The function will receive three parameters, the username and a reference to the auth object.

     *

     * @param  string  callback function name

     * @return void

     * @see    setLoginCallback()

     * @access public

     */

    function setLogoutCallback($logoutCallback)

    {

        $this->logoutCallback = $logoutCallback;

    }

    // }}}

    // {{{ setAuthData()

    /**

     * Register additional information that is to be stored

     * in the session.

     *

     * @param  string  Name of the data field

     * @param  mixed   Value of the data field

     * @param  boolean Should existing data be overwritten? (default

     *                 is true)

     * @return void

     * @access public

     */

    function setAuthData($name, $value, $overwrite = true)

    {

        if (!empty($this->session['data'][$name]) && $overwrite == false) {

            return;

        }

        $this->session['data'][$name] = $value;

    }

    // }}}

    // {{{ getAuthData()

    /**

     * Get additional information that is stored in the session.

     *

     * If no value for the first parameter is passed, the method will

     * return all data that is currently stored.

     *

     * @param  string Name of the data field

     * @return mixed  Value of the data field.

     * @access public

     */

    function getAuthData($name = null)

    {

        if (!isset($this->session['data'])) {

            return null;

        }

        if(!isset($name)) {

            return $this->session['data'];

        }

        if (isset($name) && isset($this->session['data'][$name])) {

            return $this->session['data'][$name];

        }

        return null;

    }

    // }}}

    // {{{ setAuth()

    /**

     * Register variable in a session telling that the user

     * has logged in successfully

     *

     * @param  string Username

     * @return void

     * @access public

     */

    function setAuth($username)

    {

        $this->log('Auth::setAuth() called.', AUTH_LOG_DEBUG);

        // #10729 - Regenerate session id here only if generating at login only

        //          Don't do it if we are regenerating on every request so we don't

        //          regenerate it twice in one request.

        if (!$this->regenerateSessionId) {

            // #2021 - Change the session id to avoid session fixation attacks php 4.3.3 >

            session_regenerate_id(true);

        }

        if (!isset($this->session) || !is_array($this->session)) {

            $this->session = array();

        }

        if (!isset($this->session['data'])) {

            $this->session['data'] = array();

        }

        $this->session['sessionip'] = isset($this->server['REMOTE_ADDR'])

            ? $this->server['REMOTE_ADDR']

            : '';

        $this->session['sessionuseragent'] = isset($this->server['HTTP_USER_AGENT'])

            ? $this->server['HTTP_USER_AGENT']

            : '';

        $this->session['sessionforwardedfor'] = isset($this->server['HTTP_X_FORWARDED_FOR'])

            ? $this->server['HTTP_X_FORWARDED_FOR']

            : '';

        // This should be set by the container to something more safe

        // Like md5(passwd.microtime)

        if(empty($this->session['challengekey'])) {

            $this->session['challengekey'] = md5($username.microtime());

        }

        $this->session['challengecookie'] = md5($this->session['challengekey'].microtime());

        setcookie('authchallenge', $this->session['challengecookie']);

        $this->session['registered'] = true;

        $this->session['username']   = $username;

        $this->session['timestamp']  = time();

        $this->session['idle']       = time();

    }

    // }}}

    // {{{ setAdvancedSecurity()

    /**

      * Enables advanced security checks

      *

      * Currently only ip change and useragent change

      * are detected

      * @todo Add challenge cookies - Create a cookie which changes every time

      *       and contains some challenge key which the server can verify with

      *       a session var cookie might need to be crypted (user pass)

      * @param bool Enable or disable

      * @return void

      * @access public

      */

    function setAdvancedSecurity($flag=true)

    {

        $this->advancedsecurity = $flag;

    }

    // }}}

    // {{{ checkAuth()

    /**

     * Checks if there is a session with valid auth information.

     *

     * @access public

     * @return boolean  Whether or not the user is authenticated.

     */

    function checkAuth()

    {

        $this->log('Auth::checkAuth() called.', AUTH_LOG_DEBUG);

        $this->authChecks++;

        if (isset($this->session)) {

            // Check if authentication session is expired

            if (   $this->expire > 0

                && isset($this->session['timestamp'])

                && ($this->session['timestamp'] + $this->expire) < time()) {

                $this->log('Session Expired', AUTH_LOG_INFO);

                $this->expired = true;

                $this->status = AUTH_EXPIRED;

                $this->logout();

                return false;

            }

            // Check if maximum idle time is reached

            if (   $this->idle > 0

                && isset($this->session['idle'])

                && ($this->session['idle'] + $this->idle) < time()) {

                $this->log('Session Idle Time Reached', AUTH_LOG_INFO);

                $this->idled = true;

                $this->status = AUTH_IDLED;

                $this->logout();

                return false;

            }

            if (   isset($this->session['registered'])

                && isset($this->session['username'])

                && $this->session['registered'] == true

                && $this->session['username'] != '') {

                Auth::updateIdle();

                if ($this->advancedsecurity) {

                    $this->log('Advanced Security Mode Enabled.', AUTH_LOG_DEBUG);

                    // Only Generate the challenge once

                    if($this->authChecks == 1) {

                        $this->log('Generating new Challenge Cookie.', AUTH_LOG_DEBUG);

                        $this->session['challengecookieold'] = $this->session['challengecookie'];

                        $this->session['challengecookie'] = md5($this->session['challengekey'].microtime());

                        setcookie('authchallenge', $this->session['challengecookie']);

                    }

                    // Check for ip change

                    if (   isset($this->server['REMOTE_ADDR'])

                        && $this->session['sessionip'] != $this->server['REMOTE_ADDR']) {

                        $this->log('Security Breach. Remote IP Address changed.', AUTH_LOG_INFO);

                        // Check if the IP of the user has changed, if so we

                        // assume a man in the middle attack and log him out

                        $this->expired = true;

                        $this->status = AUTH_SECURITY_BREACH;

                        $this->logout();

                        return false;

                    }

                    // Check for ip change (if connected via proxy)

                    if (   isset($this->server['HTTP_X_FORWARDED_FOR'])

                        && $this->session['sessionforwardedfor'] != $this->server['HTTP_X_FORWARDED_FOR']) {

                        $this->log('Security Breach. Forwarded For IP Address changed.', AUTH_LOG_INFO);

                        // Check if the IP of the user connecting via proxy has

                        // changed, if so we assume a man in the middle attack

                        // and log him out.

                        $this->expired = true;

                        $this->status = AUTH_SECURITY_BREACH;

                        $this->logout();

                        return false;

                    }

                    // Check for useragent change

                    if (   isset($this->server['HTTP_USER_AGENT'])

                        && $this->session['sessionuseragent'] != $this->server['HTTP_USER_AGENT']) {

                        $this->log('Security Breach. User Agent changed.', AUTH_LOG_INFO);

                        // Check if the User-Agent of the user has changed, if

                        // so we assume a man in the middle attack and log him out

                        $this->expired = true;

                        $this->status = AUTH_SECURITY_BREACH;

                        $this->logout();

                        return false;

                    }

                    // Check challenge cookie here, if challengecookieold is not set

                    // this is the first time and check is skipped

                    // TODO when user open two pages similtaneuly (open in new window,open

                    // in tab) auth breach is caused find out a way around that if possible

                    if (   isset($this->session['challengecookieold'])

                        && $this->session['challengecookieold'] != $this->cookie['authchallenge']) {

                        $this->log('Security Breach. Challenge Cookie mismatch.', AUTH_LOG_INFO);

                        $this->expired = true;

                        $this->status = AUTH_SECURITY_BREACH;

                        $this->logout();

                        $this->login();

                        return false;

                    }

                }

                if (is_callable($this->checkAuthCallback)) {

                    $this->log('Calling checkAuthCallback ('.$this->checkAuthCallback.').', AUTH_LOG_DEBUG);

                    $checkCallback = call_user_func_array($this->checkAuthCallback, array($this->username, &$this));

                    if ($checkCallback == false) {

                        $this->log('checkAuthCallback failed.', AUTH_LOG_INFO);

                        $this->expired = true;

                        $this->status = AUTH_CALLBACK_ABORT;

                        $this->logout();

                        return false;

                    }

                }

                $this->log('Session OK.', AUTH_LOG_INFO);

                return true;

            }

        }

        $this->log('Unable to locate session storage.', AUTH_LOG_DEBUG);

        return false;

    }

    // }}}

    // {{{ staticCheckAuth() [static]

    /**

     * Statically checks if there is a session with valid auth information.

     *

     * @access public