794 lines
18 KiB
PHP
794 lines
18 KiB
PHP
<?php
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/**
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* Session class for Cake.
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*
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* Cake abstracts the handling of sessions.
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* There are several convenient methods to access session information.
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* This class is the implementation of those methods.
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* They are mostly used by the Session Component.
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*
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* PHP versions 4 and 5
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*
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* CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
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* Copyright 2005-2010, Cake Software Foundation, Inc. (http://cakefoundation.org)
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*
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* Licensed under The MIT License
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* Redistributions of files must retain the above copyright notice.
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*
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* @copyright Copyright 2005-2010, Cake Software Foundation, Inc. (http://cakefoundation.org)
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* @link http://cakephp.org CakePHP(tm) Project
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* @package cake
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* @subpackage cake.cake.libs
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* @since CakePHP(tm) v .0.10.0.1222
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* @license MIT License (http://www.opensource.org/licenses/mit-license.php)
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*/
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if (!class_exists('Security')) {
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App::import('Core', 'Security');
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}
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/**
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* Session class for Cake.
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*
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* Cake abstracts the handling of sessions. There are several convenient methods to access session information.
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* This class is the implementation of those methods. They are mostly used by the Session Component.
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*
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* @package cake
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* @subpackage cake.cake.libs
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*/
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class CakeSession extends Object {
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/**
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* True if the Session is still valid
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*
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* @var boolean
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* @access public
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*/
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var $valid = false;
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/**
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* Error messages for this session
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*
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* @var array
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* @access public
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*/
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var $error = false;
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/**
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* User agent string
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*
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* @var string
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* @access protected
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*/
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var $_userAgent = '';
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/**
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* Path to where the session is active.
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*
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* @var string
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* @access public
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*/
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var $path = '/';
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/**
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* Error number of last occurred error
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*
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* @var integer
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* @access public
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*/
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var $lastError = null;
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/**
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* 'Security.level' setting, "high", "medium", or "low".
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*
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* @var string
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* @access public
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*/
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var $security = null;
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/**
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* Start time for this session.
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*
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* @var integer
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* @access public
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*/
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var $time = false;
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/**
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* Time when this session becomes invalid.
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*
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* @var integer
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* @access public
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*/
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var $sessionTime = false;
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/**
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* The number of seconds to set for session.cookie_lifetime. 0 means
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* at browser close.
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*
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* @var integer
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*/
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var $cookieLifeTime = false;
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/**
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* Keeps track of keys to watch for writes on
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*
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* @var array
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* @access public
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*/
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var $watchKeys = array();
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/**
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* Current Session id
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*
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* @var string
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* @access public
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*/
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var $id = null;
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/**
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* Hostname
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*
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* @var string
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* @access public
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*/
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var $host = null;
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/**
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* Session timeout multiplier factor
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*
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* @var integer
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* @access public
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*/
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var $timeout = null;
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/**
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* Constructor.
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*
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* @param string $base The base path for the Session
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* @param boolean $start Should session be started right now
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* @access public
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*/
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function __construct($base = null, $start = true) {
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App::import('Core', array('Set', 'Security'));
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$this->time = time();
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if (Configure::read('Session.checkAgent') === true || Configure::read('Session.checkAgent') === null) {
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if (env('HTTP_USER_AGENT') != null) {
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$this->_userAgent = md5(env('HTTP_USER_AGENT') . Configure::read('Security.salt'));
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}
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}
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if (Configure::read('Session.save') === 'database') {
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$modelName = Configure::read('Session.model');
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$database = Configure::read('Session.database');
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$table = Configure::read('Session.table');
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if (empty($database)) {
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$database = 'default';
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}
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$settings = array(
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'class' => 'Session',
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'alias' => 'Session',
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'table' => 'cake_sessions',
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'ds' => $database
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);
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if (!empty($modelName)) {
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$settings['class'] = $modelName;
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}
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if (!empty($table)) {
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$settings['table'] = $table;
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}
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ClassRegistry::init($settings);
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}
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if ($start === true) {
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if (!empty($base)) {
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$this->path = $base;
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if (strpos($base, 'index.php') !== false) {
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$this->path = str_replace('index.php', '', $base);
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}
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if (strpos($base, '?') !== false) {
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$this->path = str_replace('?', '', $base);
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}
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}
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$this->host = env('HTTP_HOST');
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if (strpos($this->host, ':') !== false) {
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$this->host = substr($this->host, 0, strpos($this->host, ':'));
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}
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}
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if (isset($_SESSION) || $start === true) {
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$this->sessionTime = $this->time + (Security::inactiveMins() * Configure::read('Session.timeout'));
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$this->security = Configure::read('Security.level');
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}
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parent::__construct();
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}
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/**
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* Starts the Session.
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*
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* @return boolean True if session was started
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* @access public
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*/
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function start() {
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if ($this->started()) {
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return true;
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}
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if (function_exists('session_write_close')) {
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session_write_close();
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}
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$this->__initSession();
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$this->__startSession();
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return $this->started();
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}
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/**
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* Determine if Session has been started.
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*
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* @access public
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* @return boolean True if session has been started.
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*/
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function started() {
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if (isset($_SESSION) && session_id()) {
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return true;
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}
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return false;
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}
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/**
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* Returns true if given variable is set in session.
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*
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* @param string $name Variable name to check for
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* @return boolean True if variable is there
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* @access public
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*/
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function check($name) {
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if (empty($name)) {
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return false;
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}
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$result = Set::classicExtract($_SESSION, $name);
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return isset($result);
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}
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/**
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* Returns the Session id
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*
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* @param id $name string
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* @return string Session id
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* @access public
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*/
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function id($id = null) {
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if ($id) {
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$this->id = $id;
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session_id($this->id);
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}
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if ($this->started()) {
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return session_id();
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} else {
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return $this->id;
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}
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}
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/**
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* Removes a variable from session.
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*
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* @param string $name Session variable to remove
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* @return boolean Success
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* @access public
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*/
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function delete($name) {
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if ($this->check($name)) {
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if (in_array($name, $this->watchKeys)) {
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trigger_error(sprintf(__('Deleting session key {%s}', true), $name), E_USER_NOTICE);
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}
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$this->__overwrite($_SESSION, Set::remove($_SESSION, $name));
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return ($this->check($name) == false);
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}
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$this->__setError(2, sprintf(__("%s doesn't exist", true), $name));
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return false;
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}
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/**
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* Used to write new data to _SESSION, since PHP doesn't like us setting the _SESSION var itself
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*
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* @param array $old Set of old variables => values
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* @param array $new New set of variable => value
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* @access private
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*/
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function __overwrite(&$old, $new) {
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if (!empty($old)) {
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foreach ($old as $key => $var) {
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if (!isset($new[$key])) {
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unset($old[$key]);
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}
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}
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}
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foreach ($new as $key => $var) {
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$old[$key] = $var;
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}
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}
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/**
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* Return error description for given error number.
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*
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* @param integer $errorNumber Error to set
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* @return string Error as string
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* @access private
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*/
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function __error($errorNumber) {
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if (!is_array($this->error) || !array_key_exists($errorNumber, $this->error)) {
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return false;
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} else {
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return $this->error[$errorNumber];
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}
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}
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/**
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* Returns last occurred error as a string, if any.
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*
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* @return mixed Error description as a string, or false.
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* @access public
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*/
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function error() {
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if ($this->lastError) {
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return $this->__error($this->lastError);
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} else {
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return false;
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}
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}
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/**
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* Returns true if session is valid.
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*
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* @return boolean Success
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* @access public
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*/
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function valid() {
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if ($this->read('Config')) {
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if ((Configure::read('Session.checkAgent') === false || $this->_userAgent == $this->read('Config.userAgent')) && $this->time <= $this->read('Config.time')) {
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if ($this->error === false) {
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$this->valid = true;
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}
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} else {
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$this->valid = false;
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$this->__setError(1, 'Session Highjacking Attempted !!!');
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}
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}
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return $this->valid;
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}
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/**
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* Returns given session variable, or all of them, if no parameters given.
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*
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* @param mixed $name The name of the session variable (or a path as sent to Set.extract)
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* @return mixed The value of the session variable
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* @access public
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*/
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function read($name = null) {
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if (is_null($name)) {
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return $this->__returnSessionVars();
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}
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if (empty($name)) {
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return false;
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}
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$result = Set::classicExtract($_SESSION, $name);
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if (!is_null($result)) {
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return $result;
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}
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$this->__setError(2, "$name doesn't exist");
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return null;
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}
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/**
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* Returns all session variables.
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*
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* @return mixed Full $_SESSION array, or false on error.
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* @access private
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*/
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function __returnSessionVars() {
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if (!empty($_SESSION)) {
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return $_SESSION;
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}
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$this->__setError(2, "No Session vars set");
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return false;
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}
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/**
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* Tells Session to write a notification when a certain session path or subpath is written to
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*
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* @param mixed $var The variable path to watch
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* @return void
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* @access public
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*/
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function watch($var) {
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if (empty($var)) {
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return false;
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}
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if (!in_array($var, $this->watchKeys, true)) {
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$this->watchKeys[] = $var;
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}
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}
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/**
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* Tells Session to stop watching a given key path
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*
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* @param mixed $var The variable path to watch
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* @return void
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* @access public
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*/
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function ignore($var) {
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if (!in_array($var, $this->watchKeys)) {
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return;
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}
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foreach ($this->watchKeys as $i => $key) {
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if ($key == $var) {
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unset($this->watchKeys[$i]);
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$this->watchKeys = array_values($this->watchKeys);
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return;
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}
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}
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}
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/**
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* Writes value to given session variable name.
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*
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* @param mixed $name Name of variable
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* @param string $value Value to write
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* @return boolean True if the write was successful, false if the write failed
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* @access public
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*/
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function write($name, $value) {
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if (empty($name)) {
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return false;
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}
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if (in_array($name, $this->watchKeys)) {
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trigger_error(sprintf(__('Writing session key {%s}: %s', true), $name, Debugger::exportVar($value)), E_USER_NOTICE);
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}
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$this->__overwrite($_SESSION, Set::insert($_SESSION, $name, $value));
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return (Set::classicExtract($_SESSION, $name) === $value);
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}
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/**
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* Helper method to destroy invalid sessions.
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*
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* @return void
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* @access public
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*/
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function destroy() {
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if ($this->started()) {
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session_destroy();
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}
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$_SESSION = null;
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$this->__construct($this->path);
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$this->start();
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$this->renew();
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$this->_checkValid();
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}
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/**
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* Helper method to initialize a session, based on Cake core settings.
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*
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* @access private
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*/
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function __initSession() {
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$iniSet = function_exists('ini_set');
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if ($iniSet && env('HTTPS')) {
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ini_set('session.cookie_secure', 1);
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}
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if ($iniSet && ($this->security === 'high' || $this->security === 'medium')) {
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ini_set('session.referer_check', $this->host);
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}
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if ($this->security == 'high') {
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$this->cookieLifeTime = 0;
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} else {
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$this->cookieLifeTime = Configure::read('Session.timeout') * (Security::inactiveMins() * 60);
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}
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switch (Configure::read('Session.save')) {
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case 'cake':
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if (empty($_SESSION)) {
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if ($iniSet) {
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ini_set('session.use_trans_sid', 0);
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ini_set('url_rewriter.tags', '');
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ini_set('session.serialize_handler', 'php');
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ini_set('session.use_cookies', 1);
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ini_set('session.name', Configure::read('Session.cookie'));
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ini_set('session.cookie_lifetime', $this->cookieLifeTime);
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ini_set('session.cookie_path', $this->path);
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ini_set('session.auto_start', 0);
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ini_set('session.save_path', TMP . 'sessions');
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}
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}
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break;
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case 'database':
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if (empty($_SESSION)) {
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if (Configure::read('Session.model') === null) {
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trigger_error(__("You must set the all Configure::write('Session.*') in core.php to use database storage"), E_USER_WARNING);
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$this->_stop();
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}
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if ($iniSet) {
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ini_set('session.use_trans_sid', 0);
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ini_set('url_rewriter.tags', '');
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ini_set('session.save_handler', 'user');
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ini_set('session.serialize_handler', 'php');
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ini_set('session.use_cookies', 1);
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ini_set('session.name', Configure::read('Session.cookie'));
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ini_set('session.cookie_lifetime', $this->cookieLifeTime);
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ini_set('session.cookie_path', $this->path);
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ini_set('session.auto_start', 0);
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}
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}
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session_set_save_handler(
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array('CakeSession','__open'),
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array('CakeSession', '__close'),
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array('CakeSession', '__read'),
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array('CakeSession', '__write'),
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array('CakeSession', '__destroy'),
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array('CakeSession', '__gc')
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);
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break;
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case 'php':
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if (empty($_SESSION)) {
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if ($iniSet) {
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ini_set('session.use_trans_sid', 0);
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ini_set('session.name', Configure::read('Session.cookie'));
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ini_set('session.cookie_lifetime', $this->cookieLifeTime);
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ini_set('session.cookie_path', $this->path);
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}
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}
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break;
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case 'cache':
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if (empty($_SESSION)) {
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if (!class_exists('Cache')) {
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require LIBS . 'cache.php';
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}
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if ($iniSet) {
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ini_set('session.use_trans_sid', 0);
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ini_set('url_rewriter.tags', '');
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ini_set('session.save_handler', 'user');
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ini_set('session.use_cookies', 1);
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ini_set('session.name', Configure::read('Session.cookie'));
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ini_set('session.cookie_lifetime', $this->cookieLifeTime);
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ini_set('session.cookie_path', $this->path);
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}
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}
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session_set_save_handler(
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array('CakeSession','__open'),
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array('CakeSession', '__close'),
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array('Cache', 'read'),
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array('Cache', 'write'),
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array('Cache', 'delete'),
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array('Cache', 'gc')
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);
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break;
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default:
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$config = CONFIGS . Configure::read('Session.save') . '.php';
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if (is_file($config)) {
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require($config);
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}
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break;
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}
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}
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/**
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* Helper method to start a session
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*
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* @access private
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*/
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function __startSession() {
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if (headers_sent()) {
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if (empty($_SESSION)) {
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$_SESSION = array();
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}
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return true;
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} elseif (!isset($_SESSION)) {
|
|
session_cache_limiter ("must-revalidate");
|
|
session_start();
|
|
header ('P3P: CP="NOI ADM DEV PSAi COM NAV OUR OTRo STP IND DEM"');
|
|
return true;
|
|
} else {
|
|
session_start();
|
|
return true;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Helper method to create a new session.
|
|
*
|
|
* @return void
|
|
* @access protected
|
|
*/
|
|
function _checkValid() {
|
|
if ($this->read('Config')) {
|
|
if ((Configure::read('Session.checkAgent') === false || $this->_userAgent == $this->read('Config.userAgent')) && $this->time <= $this->read('Config.time')) {
|
|
$time = $this->read('Config.time');
|
|
$this->write('Config.time', $this->sessionTime);
|
|
if (Configure::read('Security.level') === 'high') {
|
|
$check = $this->read('Config.timeout');
|
|
$check -= 1;
|
|
$this->write('Config.timeout', $check);
|
|
|
|
if (time() > ($time - (Security::inactiveMins() * Configure::read('Session.timeout')) + 2) || $check < 1) {
|
|
$this->renew();
|
|
$this->write('Config.timeout', 10);
|
|
}
|
|
}
|
|
$this->valid = true;
|
|
} else {
|
|
$this->destroy();
|
|
$this->valid = false;
|
|
$this->__setError(1, 'Session Highjacking Attempted !!!');
|
|
}
|
|
} else {
|
|
$this->write('Config.userAgent', $this->_userAgent);
|
|
$this->write('Config.time', $this->sessionTime);
|
|
$this->write('Config.timeout', 10);
|
|
$this->valid = true;
|
|
$this->__setError(1, 'Session is valid');
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Helper method to restart a session.
|
|
*
|
|
* @return void
|
|
* @access private
|
|
*/
|
|
function __regenerateId() {
|
|
$oldSessionId = session_id();
|
|
if ($oldSessionId) {
|
|
if (session_id() != ''|| isset($_COOKIE[session_name()])) {
|
|
setcookie(Configure::read('Session.cookie'), '', time() - 42000, $this->path);
|
|
}
|
|
session_regenerate_id(true);
|
|
if (PHP_VERSION < 5.1) {
|
|
$sessionPath = session_save_path();
|
|
if (empty($sessionPath)) {
|
|
$sessionPath = '/tmp';
|
|
}
|
|
$newSessid = session_id();
|
|
|
|
if (function_exists('session_write_close')) {
|
|
session_write_close();
|
|
}
|
|
$this->__initSession();
|
|
session_id($oldSessionId);
|
|
session_start();
|
|
session_destroy();
|
|
$file = $sessionPath . DS . 'sess_' . $oldSessionId;
|
|
@unlink($file);
|
|
$this->__initSession();
|
|
session_id($newSessid);
|
|
session_start();
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Restarts this session.
|
|
*
|
|
* @access public
|
|
*/
|
|
function renew() {
|
|
$this->__regenerateId();
|
|
}
|
|
|
|
/**
|
|
* Helper method to set an internal error message.
|
|
*
|
|
* @param integer $errorNumber Number of the error
|
|
* @param string $errorMessage Description of the error
|
|
* @return void
|
|
* @access private
|
|
*/
|
|
function __setError($errorNumber, $errorMessage) {
|
|
if ($this->error === false) {
|
|
$this->error = array();
|
|
}
|
|
$this->error[$errorNumber] = $errorMessage;
|
|
$this->lastError = $errorNumber;
|
|
}
|
|
|
|
/**
|
|
* Method called on open of a database session.
|
|
*
|
|
* @return boolean Success
|
|
* @access private
|
|
*/
|
|
function __open() {
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Method called on close of a database session.
|
|
*
|
|
* @return boolean Success
|
|
* @access private
|
|
*/
|
|
function __close() {
|
|
$probability = mt_rand(1, 150);
|
|
if ($probability <= 3) {
|
|
switch (Configure::read('Session.save')) {
|
|
case 'cache':
|
|
Cache::gc();
|
|
break;
|
|
default:
|
|
CakeSession::__gc();
|
|
break;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Method used to read from a database session.
|
|
*
|
|
* @param mixed $id The key of the value to read
|
|
* @return mixed The value of the key or false if it does not exist
|
|
* @access private
|
|
*/
|
|
function __read($id) {
|
|
$model =& ClassRegistry::getObject('Session');
|
|
|
|
$row = $model->find('first', array(
|
|
'conditions' => array($model->primaryKey => $id)
|
|
));
|
|
|
|
if (empty($row[$model->alias]['data'])) {
|
|
return false;
|
|
}
|
|
|
|
return $row[$model->alias]['data'];
|
|
}
|
|
|
|
/**
|
|
* Helper function called on write for database sessions.
|
|
*
|
|
* @param integer $id ID that uniquely identifies session in database
|
|
* @param mixed $data The value of the data to be saved.
|
|
* @return boolean True for successful write, false otherwise.
|
|
* @access private
|
|
*/
|
|
function __write($id, $data) {
|
|
if (!$id) {
|
|
return false;
|
|
}
|
|
$expires = time() + Configure::read('Session.timeout') * Security::inactiveMins();
|
|
$model =& ClassRegistry::getObject('Session');
|
|
$return = $model->save(array($model->primaryKey => $id) + compact('data', 'expires'));
|
|
return $return;
|
|
}
|
|
|
|
/**
|
|
* Method called on the destruction of a database session.
|
|
*
|
|
* @param integer $id ID that uniquely identifies session in database
|
|
* @return boolean True for successful delete, false otherwise.
|
|
* @access private
|
|
*/
|
|
function __destroy($id) {
|
|
$model =& ClassRegistry::getObject('Session');
|
|
$return = $model->delete($id);
|
|
|
|
return $return;
|
|
}
|
|
|
|
/**
|
|
* Helper function called on gc for database sessions.
|
|
*
|
|
* @param integer $expires Timestamp (defaults to current time)
|
|
* @return boolean Success
|
|
* @access private
|
|
*/
|
|
function __gc($expires = null) {
|
|
$model =& ClassRegistry::getObject('Session');
|
|
|
|
if (!$expires) {
|
|
$expires = time();
|
|
}
|
|
|
|
$return = $model->deleteAll(array($model->alias . ".expires <" => $expires), false, false);
|
|
return $return;
|
|
}
|
|
}
|