pictcode / lib / Cake / Model / Datasource / CakeSession.php @ 0b1b8047
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<?php
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/**
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* Session class for CakePHP.
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*
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* CakePHP 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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* CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
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* Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
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*
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* Licensed under The MIT License
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* For full copyright and license information, please see the LICENSE.txt
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* Redistributions of files must retain the above copyright notice.
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*
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* @copyright Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
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* @link http://cakephp.org CakePHP(tm) Project
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* @package Cake.Model.Datasource
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* @since CakePHP(tm) v .0.10.0.1222
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* @license http://www.opensource.org/licenses/mit-license.php MIT License
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*/
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App::uses('Hash', 'Utility'); |
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App::uses('Security', 'Utility'); |
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/**
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* Session class for CakePHP.
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*
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* CakePHP 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.Model.Datasource
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*/
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class CakeSession { |
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/**
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* True if the Session is still valid
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*
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* @var bool
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*/
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public static $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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*/
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public static $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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*/
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protected static $_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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*/
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public static $path = '/'; |
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/**
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* Error number of last occurred error
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*
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* @var int
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*/
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public static $lastError = null; |
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/**
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* Start time for this session.
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*
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* @var int
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*/
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public static $time = false; |
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/**
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* Cookie lifetime
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*
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* @var int
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*/
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public static $cookieLifeTime; |
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/**
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* Time when this session becomes invalid.
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*
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* @var int
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*/
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public static $sessionTime = false; |
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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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*/
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public static $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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*/
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public static $host = null; |
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/**
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* Session timeout multiplier factor
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*
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* @var int
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*/
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public static $timeout = null; |
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/**
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* Number of requests that can occur during a session time without the session being renewed.
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* This feature is only used when config value `Session.autoRegenerate` is set to true.
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*
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* @var int
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* @see CakeSession::_checkValid()
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*/
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public static $requestCountdown = 10; |
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/**
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* Whether or not the init function in this class was already called
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*
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* @var bool
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*/
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protected static $_initialized = false; |
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/**
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* Session cookie name
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*
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* @var string
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*/
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protected static $_cookieName = null; |
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/**
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* Pseudo constructor.
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*
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* @param string|null $base The base path for the Session
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* @return void
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*/
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public static function init($base = null) { |
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static::$time = time(); |
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if (env('HTTP_USER_AGENT')) { |
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static::$_userAgent = md5(env('HTTP_USER_AGENT') . Configure::read('Security.salt')); |
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} |
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static::_setPath($base); |
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static::_setHost(env('HTTP_HOST')); |
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if (!static::$_initialized) { |
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register_shutdown_function('session_write_close'); |
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} |
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static::$_initialized = true; |
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} |
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/**
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* Setup the Path variable
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*
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* @param string|null $base base path
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* @return void
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*/
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protected static function _setPath($base = null) { |
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if (empty($base)) { |
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static::$path = '/'; |
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return;
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} |
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if (strpos($base, 'index.php') !== false) { |
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$base = str_replace('index.php', '', $base); |
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} |
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if (strpos($base, '?') !== false) { |
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$base = str_replace('?', '', $base); |
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} |
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static::$path = $base; |
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} |
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/**
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* Set the host name
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*
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* @param string $host Hostname
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* @return void
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*/
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protected static function _setHost($host) { |
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static::$host = $host; |
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if (strpos(static::$host, ':') !== false) { |
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static::$host = substr(static::$host, 0, strpos(static::$host, ':')); |
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} |
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} |
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/**
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* Starts the Session.
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*
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* @return bool True if session was started
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*/
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public static function start() { |
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if (static::started()) { |
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return true; |
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} |
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$id = static::id(); |
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static::_startSession();
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if (!$id && static::started()) { |
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static::_checkValid();
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} |
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static::$error = false; |
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static::$valid = true; |
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return static::started(); |
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} |
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/**
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* Determine if Session has been started.
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*
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* @return bool True if session has been started.
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*/
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public static function started() { |
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return isset($_SESSION) && session_id(); |
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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 $name Variable name to check for
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* @return bool True if variable is there
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*/
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public static function check($name) { |
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if (empty($name) || !static::_hasSession() || !static::start()) { |
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return false; |
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} |
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return Hash::get($_SESSION, $name) !== null; |
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} |
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/**
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* Returns the session id.
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* Calling this method will not auto start the session. You might have to manually
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* assert a started session.
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*
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* Passing an id into it, you can also replace the session id if the session
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* has not already been started.
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* Note that depending on the session handler, not all characters are allowed
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* within the session id. For example, the file session handler only allows
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* characters in the range a-z A-Z 0-9 , (comma) and - (minus).
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*
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* @param string|null $id Id to replace the current session id
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* @return string Session id
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*/
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public static function id($id = null) { |
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if ($id) { |
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static::$id = $id; |
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session_id(static::$id); |
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} |
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if (static::started()) { |
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return session_id();
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} |
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return static::$id; |
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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 $name Session variable to remove
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* @return bool Success
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*/
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public static function delete($name) { |
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if (static::check($name)) { |
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static::_overwrite($_SESSION, Hash::remove($_SESSION, $name)); |
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return !static::check($name); |
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} |
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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 $new New set of variable => value
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* @return void
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*/
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protected static function _overwrite(&$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 int $errorNumber Error to set
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* @return string Error as string
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*/
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protected static function _error($errorNumber) { |
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if (!is_array(static::$error) || !array_key_exists($errorNumber, static::$error)) { |
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return false; |
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} |
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return static::$error[$errorNumber]; |
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} |
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/**
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* Returns last occurred error as a string, if any.
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*
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* @return mixed Error description as a string, or false.
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*/
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public static function error() { |
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if (static::$lastError) { |
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return static::_error(static::$lastError); |
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} |
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return false; |
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} |
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/**
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* Returns true if session is valid.
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*
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* @return bool Success
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*/
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public static function valid() { |
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if (static::start() && static::read('Config')) { |
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if (static::_validAgentAndTime() && static::$error === false) { |
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static::$valid = true; |
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} else {
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static::$valid = false; |
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static::_setError(1, 'Session Highjacking Attempted !!!'); |
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} |
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} |
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return static::$valid; |
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} |
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/**
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* Tests that the user agent is valid and that the session hasn't 'timed out'.
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* Since timeouts are implemented in CakeSession it checks the current static::$time
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* against the time the session is set to expire. The User agent is only checked
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* if Session.checkAgent == true.
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*
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* @return bool
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*/
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protected static function _validAgentAndTime() { |
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$config = static::read('Config'); |
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$validAgent = (
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Configure::read('Session.checkAgent') === false || |
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isset($config['userAgent']) && static::$_userAgent === $config['userAgent'] |
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); |
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return ($validAgent && static::$time <= $config['time']); |
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} |
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/**
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* Get / Set the user agent
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*
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* @param string|null $userAgent Set the user agent
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* @return string Current user agent.
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*/
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public static function userAgent($userAgent = null) { |
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if ($userAgent) { |
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static::$_userAgent = $userAgent; |
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} |
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if (empty(static::$_userAgent)) { |
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CakeSession::init(static::$path); |
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} |
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return static::$_userAgent; |
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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 string|null $name The name of the session variable (or a path as sent to Set.extract)
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* @return mixed The value of the session variable, null if session not available,
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* session not started, or provided name not found in the session, false on failure.
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*/
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public static function read($name = null) { |
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if (empty($name) && $name !== null) { |
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return null; |
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} |
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if (!static::_hasSession() || !static::start()) { |
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return null; |
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} |
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if ($name === null) { |
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return static::_returnSessionVars(); |
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} |
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$result = Hash::get($_SESSION, $name); |
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if (isset($result)) { |
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return $result; |
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} |
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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 $_SESSION array, or false on error.
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*/
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protected static function _returnSessionVars() { |
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if (!empty($_SESSION)) { |
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return $_SESSION; |
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} |
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static::_setError(2, 'No Session vars set'); |
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return false; |
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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 string|array $name Name of variable
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* @param string $value Value to write
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* @return bool True if the write was successful, false if the write failed
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*/
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public static function write($name, $value = null) { |
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if (empty($name) || !static::start()) { |
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return false; |
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} |
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$write = $name; |
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if (!is_array($name)) { |
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$write = array($name => $value); |
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} |
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foreach ($write as $key => $val) { |
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static::_overwrite($_SESSION, Hash::insert($_SESSION, $key, $val)); |
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if (Hash::get($_SESSION, $key) !== $val) { |
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return false; |
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} |
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} |
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return true; |
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} |
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|
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/**
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* Reads and deletes a variable from session.
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*
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* @param string $name The key to read and remove (or a path as sent to Hash.extract).
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* @return mixed The value of the session variable, null if session not available,
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* session not started, or provided name not found in the session.
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*/
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public static function consume($name) { |
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if (empty($name)) { |
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return null; |
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} |
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$value = static::read($name); |
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if ($value !== null) { |
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static::_overwrite($_SESSION, Hash::remove($_SESSION, $name)); |
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} |
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return $value; |
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} |
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/**
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* Helper method to destroy invalid sessions.
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*
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* @return void
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*/
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public static function destroy() { |
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if (!static::started()) { |
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static::_startSession();
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} |
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if (static::started()) { |
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session_destroy(); |
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} |
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$_SESSION = null; |
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static::$id = null; |
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static::$_cookieName = null; |
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} |
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/**
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* Clears the session.
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*
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* Optionally also clears the session id and renews the session.
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*
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* @param bool $renew If the session should also be renewed. Defaults to true.
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* @return void
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*/
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public static function clear($renew = true) { |
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if (!$renew) { |
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$_SESSION = array(); |
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return;
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} |
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$_SESSION = null; |
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static::$id = null; |
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static::renew();
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} |
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|
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/**
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* Helper method to initialize a session, based on CakePHP core settings.
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*
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* Sessions can be configured with a few shortcut names as well as have any number of ini settings declared.
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*
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* @return void
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* @throws CakeSessionException Throws exceptions when ini_set() fails.
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*/
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protected static function _configureSession() { |
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$sessionConfig = Configure::read('Session'); |
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|
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if (isset($sessionConfig['defaults'])) { |
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$defaults = static::_defaultConfig($sessionConfig['defaults']); |
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if ($defaults) { |
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$sessionConfig = Hash::merge($defaults, $sessionConfig); |
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} |
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} |
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if (!isset($sessionConfig['ini']['session.cookie_secure']) && env('HTTPS')) { |
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$sessionConfig['ini']['session.cookie_secure'] = 1; |
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} |
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if (isset($sessionConfig['timeout']) && !isset($sessionConfig['cookieTimeout'])) { |
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$sessionConfig['cookieTimeout'] = $sessionConfig['timeout']; |
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} |
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if (!isset($sessionConfig['ini']['session.cookie_lifetime'])) { |
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$sessionConfig['ini']['session.cookie_lifetime'] = $sessionConfig['cookieTimeout'] * 60; |
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} |
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if (!isset($sessionConfig['ini']['session.name'])) { |
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$sessionConfig['ini']['session.name'] = $sessionConfig['cookie']; |
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} |
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static::$_cookieName = $sessionConfig['ini']['session.name']; |
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|
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if (!empty($sessionConfig['handler'])) { |
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$sessionConfig['ini']['session.save_handler'] = 'user'; |
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} elseif (!empty($sessionConfig['session.save_path']) && Configure::read('debug')) { |
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if (!is_dir($sessionConfig['session.save_path'])) { |
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mkdir($sessionConfig['session.save_path'], 0775, true); |
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} |
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} |
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|
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if (!isset($sessionConfig['ini']['session.gc_maxlifetime'])) { |
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$sessionConfig['ini']['session.gc_maxlifetime'] = $sessionConfig['timeout'] * 60; |
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} |
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if (!isset($sessionConfig['ini']['session.cookie_httponly'])) { |
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$sessionConfig['ini']['session.cookie_httponly'] = 1; |
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} |
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|
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if (empty($_SESSION)) { |
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if (!empty($sessionConfig['ini']) && is_array($sessionConfig['ini'])) { |
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foreach ($sessionConfig['ini'] as $setting => $value) { |
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if (ini_set($setting, $value) === false) { |
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throw new CakeSessionException(__d('cake_dev', 'Unable to configure the session, setting %s failed.', $setting)); |
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} |
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} |
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} |
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} |
| 547 |
if (!empty($sessionConfig['handler']) && !isset($sessionConfig['handler']['engine'])) { |
| 548 |
call_user_func_array('session_set_save_handler', $sessionConfig['handler']); |
| 549 |
} |
| 550 |
if (!empty($sessionConfig['handler']['engine'])) { |
| 551 |
$handler = static::_getHandler($sessionConfig['handler']['engine']); |
| 552 |
session_set_save_handler( |
| 553 |
array($handler, 'open'), |
| 554 |
array($handler, 'close'), |
| 555 |
array($handler, 'read'), |
| 556 |
array($handler, 'write'), |
| 557 |
array($handler, 'destroy'), |
| 558 |
array($handler, 'gc') |
| 559 |
); |
| 560 |
} |
| 561 |
Configure::write('Session', $sessionConfig); |
| 562 |
static::$sessionTime = static::$time + ($sessionConfig['timeout'] * 60); |
| 563 |
} |
| 564 |
|
| 565 |
/**
|
| 566 |
* Get session cookie name.
|
| 567 |
*
|
| 568 |
* @return string
|
| 569 |
*/
|
| 570 |
protected static function _cookieName() { |
| 571 |
if (static::$_cookieName !== null) { |
| 572 |
return static::$_cookieName; |
| 573 |
} |
| 574 |
|
| 575 |
static::init();
|
| 576 |
static::_configureSession();
|
| 577 |
|
| 578 |
return static::$_cookieName = session_name(); |
| 579 |
} |
| 580 |
|
| 581 |
/**
|
| 582 |
* Returns whether a session exists
|
| 583 |
*
|
| 584 |
* @return bool
|
| 585 |
*/
|
| 586 |
protected static function _hasSession() { |
| 587 |
return static::started() || isset($_COOKIE[static::_cookieName()]); |
| 588 |
} |
| 589 |
|
| 590 |
/**
|
| 591 |
* Find the handler class and make sure it implements the correct interface.
|
| 592 |
*
|
| 593 |
* @param string $handler Handler name.
|
| 594 |
* @return void
|
| 595 |
* @throws CakeSessionException
|
| 596 |
*/
|
| 597 |
protected static function _getHandler($handler) { |
| 598 |
list($plugin, $class) = pluginSplit($handler, true); |
| 599 |
App::uses($class, $plugin . 'Model/Datasource/Session'); |
| 600 |
if (!class_exists($class)) { |
| 601 |
throw new CakeSessionException(__d('cake_dev', 'Could not load %s to handle the session.', $class)); |
| 602 |
} |
| 603 |
$handler = new $class(); |
| 604 |
if ($handler instanceof CakeSessionHandlerInterface) { |
| 605 |
return $handler; |
| 606 |
} |
| 607 |
throw new CakeSessionException(__d('cake_dev', 'Chosen SessionHandler does not implement CakeSessionHandlerInterface it cannot be used with an engine key.')); |
| 608 |
} |
| 609 |
|
| 610 |
/**
|
| 611 |
* Get one of the prebaked default session configurations.
|
| 612 |
*
|
| 613 |
* @param string $name Config name.
|
| 614 |
* @return bool|array
|
| 615 |
*/
|
| 616 |
protected static function _defaultConfig($name) { |
| 617 |
$defaults = array( |
| 618 |
'php' => array( |
| 619 |
'cookie' => 'CAKEPHP', |
| 620 |
'timeout' => 240, |
| 621 |
'ini' => array( |
| 622 |
'session.use_trans_sid' => 0, |
| 623 |
'session.cookie_path' => static::$path |
| 624 |
) |
| 625 |
), |
| 626 |
'cake' => array( |
| 627 |
'cookie' => 'CAKEPHP', |
| 628 |
'timeout' => 240, |
| 629 |
'ini' => array( |
| 630 |
'session.use_trans_sid' => 0, |
| 631 |
'url_rewriter.tags' => '', |
| 632 |
'session.serialize_handler' => 'php', |
| 633 |
'session.use_cookies' => 1, |
| 634 |
'session.cookie_path' => static::$path, |
| 635 |
'session.save_path' => TMP . 'sessions', |
| 636 |
'session.save_handler' => 'files' |
| 637 |
) |
| 638 |
), |
| 639 |
'cache' => array( |
| 640 |
'cookie' => 'CAKEPHP', |
| 641 |
'timeout' => 240, |
| 642 |
'ini' => array( |
| 643 |
'session.use_trans_sid' => 0, |
| 644 |
'url_rewriter.tags' => '', |
| 645 |
'session.use_cookies' => 1, |
| 646 |
'session.cookie_path' => static::$path, |
| 647 |
'session.save_handler' => 'user', |
| 648 |
), |
| 649 |
'handler' => array( |
| 650 |
'engine' => 'CacheSession', |
| 651 |
'config' => 'default' |
| 652 |
) |
| 653 |
), |
| 654 |
'database' => array( |
| 655 |
'cookie' => 'CAKEPHP', |
| 656 |
'timeout' => 240, |
| 657 |
'ini' => array( |
| 658 |
'session.use_trans_sid' => 0, |
| 659 |
'url_rewriter.tags' => '', |
| 660 |
'session.use_cookies' => 1, |
| 661 |
'session.cookie_path' => static::$path, |
| 662 |
'session.save_handler' => 'user', |
| 663 |
'session.serialize_handler' => 'php', |
| 664 |
), |
| 665 |
'handler' => array( |
| 666 |
'engine' => 'DatabaseSession', |
| 667 |
'model' => 'Session' |
| 668 |
) |
| 669 |
) |
| 670 |
); |
| 671 |
if (isset($defaults[$name])) { |
| 672 |
return $defaults[$name]; |
| 673 |
} |
| 674 |
return false; |
| 675 |
} |
| 676 |
|
| 677 |
/**
|
| 678 |
* Helper method to start a session
|
| 679 |
*
|
| 680 |
* @return bool Success
|
| 681 |
*/
|
| 682 |
protected static function _startSession() { |
| 683 |
static::init();
|
| 684 |
session_write_close(); |
| 685 |
static::_configureSession();
|
| 686 |
|
| 687 |
if (headers_sent()) { |
| 688 |
if (empty($_SESSION)) { |
| 689 |
$_SESSION = array(); |
| 690 |
} |
| 691 |
} else {
|
| 692 |
// For IE<=8
|
| 693 |
session_cache_limiter("must-revalidate");
|
| 694 |
session_start(); |
| 695 |
} |
| 696 |
return true; |
| 697 |
} |
| 698 |
|
| 699 |
/**
|
| 700 |
* Helper method to create a new session.
|
| 701 |
*
|
| 702 |
* @return void
|
| 703 |
*/
|
| 704 |
protected static function _checkValid() { |
| 705 |
$config = static::read('Config'); |
| 706 |
if ($config) { |
| 707 |
$sessionConfig = Configure::read('Session'); |
| 708 |
|
| 709 |
if (static::valid()) { |
| 710 |
static::write('Config.time', static::$sessionTime); |
| 711 |
if (isset($sessionConfig['autoRegenerate']) && $sessionConfig['autoRegenerate'] === true) { |
| 712 |
$check = $config['countdown']; |
| 713 |
$check -= 1; |
| 714 |
static::write('Config.countdown', $check); |
| 715 |
|
| 716 |
if ($check < 1) { |
| 717 |
static::renew();
|
| 718 |
static::write('Config.countdown', static::$requestCountdown); |
| 719 |
} |
| 720 |
} |
| 721 |
} else {
|
| 722 |
$_SESSION = array(); |
| 723 |
static::destroy();
|
| 724 |
static::_setError(1, 'Session Highjacking Attempted !!!'); |
| 725 |
static::_startSession();
|
| 726 |
static::_writeConfig();
|
| 727 |
} |
| 728 |
} else {
|
| 729 |
static::_writeConfig();
|
| 730 |
} |
| 731 |
} |
| 732 |
|
| 733 |
/**
|
| 734 |
* Writes configuration variables to the session
|
| 735 |
*
|
| 736 |
* @return void
|
| 737 |
*/
|
| 738 |
protected static function _writeConfig() { |
| 739 |
static::write('Config.userAgent', static::$_userAgent); |
| 740 |
static::write('Config.time', static::$sessionTime); |
| 741 |
static::write('Config.countdown', static::$requestCountdown); |
| 742 |
} |
| 743 |
|
| 744 |
/**
|
| 745 |
* Restarts this session.
|
| 746 |
*
|
| 747 |
* @return void
|
| 748 |
*/
|
| 749 |
public static function renew() { |
| 750 |
if (session_id() === '') { |
| 751 |
return;
|
| 752 |
} |
| 753 |
if (isset($_COOKIE[session_name()])) { |
| 754 |
setcookie(Configure::read('Session.cookie'), '', time() - 42000, static::$path); |
| 755 |
} |
| 756 |
session_regenerate_id(true);
|
| 757 |
} |
| 758 |
|
| 759 |
/**
|
| 760 |
* Helper method to set an internal error message.
|
| 761 |
*
|
| 762 |
* @param int $errorNumber Number of the error
|
| 763 |
* @param string $errorMessage Description of the error
|
| 764 |
* @return void
|
| 765 |
*/
|
| 766 |
protected static function _setError($errorNumber, $errorMessage) { |
| 767 |
if (static::$error === false) { |
| 768 |
static::$error = array(); |
| 769 |
} |
| 770 |
static::$error[$errorNumber] = $errorMessage; |
| 771 |
static::$lastError = $errorNumber; |
| 772 |
} |
| 773 |
|
| 774 |
} |