709 lines
17 KiB
PHP
709 lines
17 KiB
PHP
<?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 boolean
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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 integer
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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 integer
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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 integer
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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 integer
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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 integer
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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 integer
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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 boolean
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*/
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protected static $_initialized = false;
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/**
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* Pseudo constructor.
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*
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* @param string $base The base path for the Session
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* @return void
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*/
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public static function init($base = null) {
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self::$time = time();
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$checkAgent = Configure::read('Session.checkAgent');
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if (env('HTTP_USER_AGENT')) {
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self::$_userAgent = md5(env('HTTP_USER_AGENT') . Configure::read('Security.salt'));
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}
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self::_setPath($base);
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self::_setHost(env('HTTP_HOST'));
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if (!self::$_initialized) {
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register_shutdown_function('session_write_close');
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}
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self::$_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 $base base path
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* @return void
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*/
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protected static function _setPath($base = null) {
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if (empty($base)) {
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self::$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('?', '', $base);
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}
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self::$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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self::$host = $host;
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if (strpos(self::$host, ':') !== false) {
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self::$host = substr(self::$host, 0, strpos(self::$host, ':'));
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}
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}
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/**
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* Starts the Session.
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*
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* @return boolean True if session was started
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*/
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public static function start() {
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if (self::started()) {
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return true;
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}
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$id = self::id();
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self::_startSession();
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if (!$id && self::started()) {
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self::_checkValid();
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}
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self::$error = false;
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self::$valid = true;
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return self::started();
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}
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/**
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* Determine if Session has been started.
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*
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* @return boolean True if session has been started.
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*/
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public static function started() {
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return isset($_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 $name Variable name to check for
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* @return boolean True if variable is there
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*/
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public static function check($name = null) {
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if (!self::start()) {
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return false;
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}
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if (empty($name)) {
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return false;
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}
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return Hash::get($_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 $id Id to replace the current session id
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* @return string Session id
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*/
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public static function id($id = null) {
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if ($id) {
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self::$id = $id;
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session_id(self::$id);
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}
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if (self::started()) {
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return session_id();
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}
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return self::$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 $name Session variable to remove
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* @return boolean Success
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*/
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public static function delete($name) {
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if (self::check($name)) {
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self::_overwrite($_SESSION, Hash::remove($_SESSION, $name));
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return !self::check($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 integer $errorNumber Error to set
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* @return string Error as string
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*/
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protected static function _error($errorNumber) {
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if (!is_array(self::$error) || !array_key_exists($errorNumber, self::$error)) {
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return false;
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}
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return self::$error[$errorNumber];
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}
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/**
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* Returns last occurred error as a string, if any.
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*
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* @return mixed Error description as a string, or false.
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*/
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public static function error() {
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if (self::$lastError) {
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return self::_error(self::$lastError);
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}
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return false;
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}
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/**
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* Returns true if session is valid.
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*
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* @return boolean Success
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*/
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public static function valid() {
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if (self::read('Config')) {
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if (self::_validAgentAndTime() && self::$error === false) {
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self::$valid = true;
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} else {
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self::$valid = false;
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self::_setError(1, 'Session Highjacking Attempted !!!');
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}
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}
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return self::$valid;
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}
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/**
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* Tests that the user agent is valid and that the session hasn't 'timed out'.
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* Since timeouts are implemented in CakeSession it checks the current self::$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 boolean
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*/
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protected static function _validAgentAndTime() {
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$config = self::read('Config');
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$validAgent = (
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Configure::read('Session.checkAgent') === false ||
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self::$_userAgent == $config['userAgent']
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);
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return ($validAgent && self::$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 $userAgent Set the user agent
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* @return string Current user agent
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*/
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public static function userAgent($userAgent = null) {
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if ($userAgent) {
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self::$_userAgent = $userAgent;
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}
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if (empty(self::$_userAgent)) {
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CakeSession::init(self::$path);
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}
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return self::$_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|array $name The name of the session variable (or a path as sent to Set.extract)
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* @return mixed The value of the session variable
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*/
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public static function read($name = null) {
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if (!self::start()) {
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return false;
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}
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if ($name === null) {
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return self::_returnSessionVars();
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}
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if (empty($name)) {
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return false;
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}
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$result = Hash::get($_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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self::_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 $value Value to write
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* @return boolean True if the write was successful, false if the write failed
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*/
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public static function write($name, $value = null) {
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if (!self::start()) {
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return false;
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}
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if (empty($name)) {
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return false;
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}
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$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 => $val) {
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self::_overwrite($_SESSION, Hash::insert($_SESSION, $key, $val));
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if (Hash::get($_SESSION, $key) !== $val) {
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return false;
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}
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}
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return true;
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}
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/**
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* Helper method to destroy invalid sessions.
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*
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* @return void
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*/
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public static function destroy() {
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if (!self::started()) {
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self::_startSession();
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}
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session_destroy();
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$_SESSION = null;
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self::$id = null;
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}
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/**
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* Clears the session, the session id, and renews the session.
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*
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* @return void
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*/
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public static function clear() {
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$_SESSION = null;
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self::$id = null;
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self::renew();
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}
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/**
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* Helper method to initialize a session, based on CakePHP core settings.
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*
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* Sessions can be configured with a few shortcut names as well as have any number of ini settings declared.
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*
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* @return void
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* @throws CakeSessionException Throws exceptions when ini_set() fails.
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*/
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protected static function _configureSession() {
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$sessionConfig = Configure::read('Session');
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if (isset($sessionConfig['defaults'])) {
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$defaults = self::_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'] = $sessionConfig['cookie'];
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}
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if (!empty($sessionConfig['handler'])) {
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$sessionConfig['ini']['session.save_handler'] = 'user';
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}
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if (!isset($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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$sessionConfig['ini']['session.cookie_httponly'] = 1;
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}
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if (empty($_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.', $setting));
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}
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}
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}
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}
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if (!empty($sessionConfig['handler']) && !isset($sessionConfig['handler']['engine'])) {
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call_user_func_array('session_set_save_handler', $sessionConfig['handler']);
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}
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if (!empty($sessionConfig['handler']['engine'])) {
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$handler = self::_getHandler($sessionConfig['handler']['engine']);
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session_set_save_handler(
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array($handler, 'open'),
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array($handler, 'close'),
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array($handler, 'read'),
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array($handler, 'write'),
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array($handler, 'destroy'),
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array($handler, 'gc')
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);
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}
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Configure::write('Session', $sessionConfig);
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self::$sessionTime = self::$time + ($sessionConfig['timeout'] * 60);
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}
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/**
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* Find the handler class and make sure it implements the correct interface.
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*
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* @param string $handler
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* @return void
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* @throws CakeSessionException
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*/
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protected static function _getHandler($handler) {
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list($plugin, $class) = pluginSplit($handler, true);
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App::uses($class, $plugin . 'Model/Datasource/Session');
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if (!class_exists($class)) {
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throw new CakeSessionException(__d('cake_dev', 'Could not load %s to handle the session.', $class));
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}
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$handler = new $class();
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if ($handler instanceof CakeSessionHandlerInterface) {
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return $handler;
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}
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throw new CakeSessionException(__d('cake_dev', 'Chosen SessionHandler does not implement CakeSessionHandlerInterface it cannot be used with an engine key.'));
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}
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/**
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* Get one of the prebaked default session configurations.
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*
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* @param string $name
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* @return boolean|array
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*/
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protected static function _defaultConfig($name) {
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$defaults = array(
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'php' => array(
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'cookie' => 'CAKEPHP',
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'timeout' => 240,
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'ini' => array(
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'session.use_trans_sid' => 0,
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'session.cookie_path' => self::$path
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)
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),
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'cake' => array(
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'cookie' => 'CAKEPHP',
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'timeout' => 240,
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'ini' => array(
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'session.use_trans_sid' => 0,
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'url_rewriter.tags' => '',
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'session.serialize_handler' => 'php',
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'session.use_cookies' => 1,
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'session.cookie_path' => self::$path,
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'session.save_path' => TMP . 'sessions',
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'session.save_handler' => 'files'
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)
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),
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'cache' => array(
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'cookie' => 'CAKEPHP',
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'timeout' => 240,
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'ini' => array(
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'session.use_trans_sid' => 0,
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'url_rewriter.tags' => '',
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'session.use_cookies' => 1,
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'session.cookie_path' => self::$path,
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'session.save_handler' => 'user',
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),
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'handler' => array(
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'engine' => 'CacheSession',
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'config' => 'default'
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)
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),
|
|
'database' => array(
|
|
'cookie' => 'CAKEPHP',
|
|
'timeout' => 240,
|
|
'ini' => array(
|
|
'session.use_trans_sid' => 0,
|
|
'url_rewriter.tags' => '',
|
|
'session.use_cookies' => 1,
|
|
'session.cookie_path' => self::$path,
|
|
'session.save_handler' => 'user',
|
|
'session.serialize_handler' => 'php',
|
|
),
|
|
'handler' => array(
|
|
'engine' => 'DatabaseSession',
|
|
'model' => 'Session'
|
|
)
|
|
)
|
|
);
|
|
if (isset($defaults[$name])) {
|
|
return $defaults[$name];
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Helper method to start a session
|
|
*
|
|
* @return boolean Success
|
|
*/
|
|
protected static function _startSession() {
|
|
self::init();
|
|
session_write_close();
|
|
self::_configureSession();
|
|
|
|
if (headers_sent()) {
|
|
if (empty($_SESSION)) {
|
|
$_SESSION = array();
|
|
}
|
|
} else {
|
|
// For IE<=8
|
|
session_cache_limiter("must-revalidate");
|
|
session_start();
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Helper method to create a new session.
|
|
*
|
|
* @return void
|
|
*/
|
|
protected static function _checkValid() {
|
|
$config = self::read('Config');
|
|
if ($config) {
|
|
$sessionConfig = Configure::read('Session');
|
|
|
|
if (self::valid()) {
|
|
self::write('Config.time', self::$sessionTime);
|
|
if (isset($sessionConfig['autoRegenerate']) && $sessionConfig['autoRegenerate'] === true) {
|
|
$check = $config['countdown'];
|
|
$check -= 1;
|
|
self::write('Config.countdown', $check);
|
|
|
|
if ($check < 1) {
|
|
self::renew();
|
|
self::write('Config.countdown', self::$requestCountdown);
|
|
}
|
|
}
|
|
} else {
|
|
$_SESSION = array();
|
|
self::destroy();
|
|
self::_setError(1, 'Session Highjacking Attempted !!!');
|
|
self::_startSession();
|
|
self::_writeConfig();
|
|
}
|
|
} else {
|
|
self::_writeConfig();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Writes configuration variables to the session
|
|
*
|
|
* @return void
|
|
*/
|
|
protected static function _writeConfig() {
|
|
self::write('Config.userAgent', self::$_userAgent);
|
|
self::write('Config.time', self::$sessionTime);
|
|
self::write('Config.countdown', self::$requestCountdown);
|
|
}
|
|
|
|
/**
|
|
* Restarts this session.
|
|
*
|
|
* @return void
|
|
*/
|
|
public static function renew() {
|
|
if (session_id()) {
|
|
if (session_id() || isset($_COOKIE[session_name()])) {
|
|
setcookie(Configure::read('Session.cookie'), '', time() - 42000, self::$path);
|
|
}
|
|
session_regenerate_id(true);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Helper method to set an internal error message.
|
|
*
|
|
* @param integer $errorNumber Number of the error
|
|
* @param string $errorMessage Description of the error
|
|
* @return void
|
|
*/
|
|
protected static function _setError($errorNumber, $errorMessage) {
|
|
if (self::$error === false) {
|
|
self::$error = array();
|
|
}
|
|
self::$error[$errorNumber] = $errorMessage;
|
|
self::$lastError = $errorNumber;
|
|
}
|
|
|
|
}
|