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<?php
/* SVN FILE: $Id$ */

/**
* Session class for Cake.
*
* Cake abstracts the handling of sessions.
* There are several convenient methods to access session information.
* This class is the implementation of those methods.
* They are mostly used by the Session Component.
*
* PHP versions 4 and 5
*
* CakePHP(tm) : Rapid Development Framework (http://www.cakephp.org)
* Copyright 2005-2008, Cake Software Foundation, Inc. (http://www.cakefoundation.org)
*
* Licensed under The MIT License
* Redistributions of files must retain the above copyright notice.
*
* @filesource
* @copyright Copyright 2005-2008, Cake Software Foundation, Inc. (http://www.cakefoundation.org)
* @link http://www.cakefoundation.org/projects/info/cakephp CakePHP(tm) Project
* @package cake
* @subpackage cake.cake.libs
* @since CakePHP(tm) v .0.10.0.1222
* @version $Revision$
* @modifiedby $LastChangedBy$
* @lastmodified $Date$
* @license http://www.opensource.org/licenses/mit-license.php The MIT License
*/

/**
* Session class for Cake.
*
* Cake abstracts the handling of sessions. There are several convenient methods to access session information.
* This class is the implementation of those methods. They are mostly used by the Session Component.
*
* @package cake
* @subpackage cake.cake.libs
*/
class CakeSession extends Object {

/**
* True if the Session is still valid
*
* @var boolean
* @access public
*/
var $valid = false;

/**
* Error messages for this session
*
* @var array
* @access public
*/
var $error = false;

/**
* User agent string
*
* @var string
* @access protected
*/
var $_userAgent = '';

/**
* Path to where the session is active.
*
* @var string
* @access public
*/
var $path = '/';

/**
* Error number of last occurred error
*
* @var integer
* @access public
*/
var $lastError = null;

/**
* 'Security.level' setting, "high", "medium", or "low".
*
* @var string
* @access public
*/
var $security = null;

/**
* Start time for this session.
*
* @var integer
* @access public
*/
var $time = false;

/**
* Time when this session becomes invalid.
*
* @var integer
* @access public
*/
var $sessionTime = false;

/**
* Keeps track of keys to watch for writes on
*
* @var array
* @access public
*/
var $watchKeys = array();

/**
* Current Session id
*
* @var string
* @access public
*/
var $id = null;

/**
* Constructor.
*
* @param string $base The base path for the Session
* @param boolean $start Should session be started right now
* @access public
*/
function __construct($base = null, $start = true) {
App::import('Core', 'Set', 'Security');
$this->time = time();

if (Configure::read('Session.checkAgent') === true || Configure::read('Session.checkAgent') === null) {
if (env('HTTP_USER_AGENT') != null) {
$this->_userAgent = md5(env('HTTP_USER_AGENT') . Configure::read('Security.salt'));
}
}
if (Configure::read('Session.save') === 'database') {
$modelName = Configure::read('Session.model');
$database = Configure::read('Session.database');
$table = Configure::read('Session.table');

if (empty($database)) {
$database = 'default';
}
if (empty($modelName)) {
ClassRegistry::init(array(
'class' => Inflector::classify($table),
'alias' => 'Session'
));
} else {
ClassRegistry::init(array(
'class' => $modelName,
'alias' => 'Session'
));
}
}
if ($start === true) {
if (!empty($base)) {
$this->path = $base;
if (strpos($base, 'index.php') !== false) {
$this->path = str_replace('index.php', '', $base);
}
if (strpos($base, '?') !== false) {
$this->path = str_replace('?', '', $base);
}
}
$this->host = env('HTTP_HOST');

if (strpos($this->host, ':') !== false) {
$this->host = substr($this->host, 0, strpos($this->host, ':'));
}
if (!class_exists('Security')) {
App::import('Core', 'Security');
}
$this->sessionTime = $this->time + (Security::inactiveMins() * Configure::read('Session.timeout'));
$this->security = Configure::read('Security.level');
}
parent::__construct();
}

/**
* Starts the Session.
*
* @param string $name Variable name to check for
* @return boolean True if variable is there
* @access public
*/
function start() {
if (function_exists('session_write_close')) {
session_write_close();
}
$this->__initSession();
return $this->__startSession();
}

/**
* Determine if Session has been started.
*
* @access public
* @return boolean True if session has been started.
*/
function started() {
if (isset($_SESSION)) {
return true;
}
return false;
}

/**
* Returns true if given variable is set in session.
*
* @param string $name Variable name to check for
* @return boolean True if variable is there
* @access public
*/
function check($name) {
$var = $this->__validateKeys($name);
if (empty($var)) {
return false;
}
$result = Set::extract($_SESSION, $var);
return isset($result);
}

/**
* Returns the Session id
*
* @param id $name string
* @return string Session id
* @access public
*/
function id($id = null) {
if ($id) {
$this->id = $id;
session_id($this->id);
}
if (isset($_SESSION)) {
return session_id();
} else {
return $this->id;
}
}

/**
* Removes a variable from session.
*
* @param string $name Session variable to remove
* @return boolean Success
* @access public
*/
function del($name) {
if ($this->check($name)) {
if ($var = $this->__validateKeys($name)) {
if (in_array($var, $this->watchKeys)) {
trigger_error('Deleting session key {' . $var . '}', E_USER_NOTICE);
}
$this->__overwrite($_SESSION, Set::remove($_SESSION, $var));
return ($this->check($var) == false);
}
}
$this->__setError(2, "$name doesn't exist");
return false;
}

/**
* Used to write new data to _SESSION, since PHP doesn't like us setting the _SESSION var itself
*
* @param array $old Set of old variables => values
* @param array $new New set of variable => value
* @access private
*/
function __overwrite(&$old, $new) {
if (!empty($old)) {
foreach ($old as $key => $var) {
if (!isset($new[$key])) {
unset($old[$key]);
}
}
}
foreach ($new as $key => $var) {
$old[$key] = $var;
}
}

/**
* Return error description for given error number.
*
* @param integer $errorNumber Error to set
* @return string Error as string
* @access private
*/
function __error($errorNumber) {
if (!is_array($this->error) || !array_key_exists($errorNumber, $this->error)) {
return false;
} else {
return $this->error[$errorNumber];
}
}

/**
* Returns last occurred error as a string, if any.
*
* @return mixed Error description as a string, or false.
* @access public
*/
function error() {
if ($this->lastError) {
return $this->__error($this->lastError);
} else {
return false;
}
}

/**
* Returns true if session is valid.
*
* @return boolean Success
* @access public
*/
function valid() {
if ($this->read('Config')) {
if ((Configure::read('Session.checkAgent') === false || $this->_userAgent == $this->read('Config.userAgent')) && $this->time <= $this->read('Config.time')) {
if ($this->error === false) {
$this->valid = true;
}
} else {
$this->valid = false;
$this->__setError(1, 'Session Highjacking Attempted !!!');
}
}
return $this->valid;
}

/**
* Returns given session variable, or all of them, if no parameters given.
*
* @param mixed $name The name of the session variable (or a path as sent to Set.extract)
* @return mixed The value of the session variable
* @access public
*/
function read($name = null) {
if (is_null($name)) {
return $this->__returnSessionVars();
}
if (empty($name)) {
return false;
}
$result = Set::extract($_SESSION, $name);

if (!is_null($result)) {
return $result;
}
$this->__setError(2, "$name doesn't exist");
return null;
}

/**
* Returns all session variables.
*
* @return mixed Full $_SESSION array, or false on error.
* @access private
*/
function __returnSessionVars() {
if (!empty($_SESSION)) {
return $_SESSION;
}
$this->__setError(2, "No Session vars set");
return false;
}

/**
* Tells Session to write a notification when a certain session path or subpath is written to
*
* @param mixed $var The variable path to watch
* @return void
* @access public
*/
function watch($var) {
$var = $this->__validateKeys($var);
if (empty($var)) {
return false;
}
if (!in_array($var, $this->watchKeys, true)) {
$this->watchKeys[] = $var;
}
}

/**
* Tells Session to stop watching a given key path
*
* @param mixed $var The variable path to watch
* @return void
* @access public
*/
function ignore($var) {
$var = $this->__validateKeys($var);
if (!in_array($var, $this->watchKeys)) {
return;
}
foreach ($this->watchKeys as $i => $key) {
if ($key == $var) {
unset($this->watchKeys[$i]);
$this->watchKeys = array_values($this->watchKeys);
return;
}
}
}

/**
* Writes value to given session variable name.
*
* @param mixed $name Name of variable
* @param string $value Value to write
* @return boolean True if the write was successful, false if the write failed
* @access public
*/
function write($name, $value) {
$var = $this->__validateKeys($name);

if (empty($var)) {
return false;
}
if (in_array($var, $this->watchKeys)) {
trigger_error('Writing session key {' . $var . '}: ' . Debugger::exportVar($value), E_USER_NOTICE);
}
$this->__overwrite($_SESSION, Set::insert($_SESSION, $var, $value));
return (Set::extract($_SESSION, $var) === $value);
}

/**
* Helper method to destroy invalid sessions.
*
* @return void
* @access public
*/
function destroy() {
$_SESSION = array();
$this->__construct($this->path);
$this->start();
$this->renew();
$this->_checkValid();
}

/**
* Helper method to initialize a session, based on Cake core settings.
*
* @access private
*/
function __initSession() {
$iniSet = function_exists('ini_set');

if ($iniSet && env('HTTPS')) {
ini_set('session.cookie_secure', 1);
}

switch ($this->security) {
case 'high':
$this->cookieLifeTime = 0;
if ($iniSet) {
ini_set('session.referer_check', $this->host);
}
break;
case 'medium':
$this->cookieLifeTime = 7 * 86400;
if ($iniSet) {
ini_set('session.referer_check', $this->host);
}
break;
case 'low':
default:
$this->cookieLifeTime = 788940000;
break;
}

switch (Configure::read('Session.save')) {
case 'cake':
if (empty($_SESSION)) {
if ($iniSet) {
ini_set('session.use_trans_sid', 0);
ini_set('url_rewriter.tags', '');
ini_set('session.serialize_handler', 'php');
ini_set('session.use_cookies', 1);
ini_set('session.name', Configure::read('Session.cookie'));
ini_set('session.cookie_lifetime', $this->cookieLifeTime);
ini_set('session.cookie_path', $this->path);
ini_set('session.auto_start', 0);
ini_set('session.save_path', TMP . 'sessions');
}
}
break;
case 'database':
if (empty($_SESSION)) {
if (Configure::read('Session.table') === null) {
trigger_error(__("You must set the all Configure::write('Session.*') in core.php to use database storage"), E_USER_WARNING);
exit();
} elseif (Configure::read('Session.database') === null) {
Configure::write('Session.database', 'default');
}
if ($iniSet) {
ini_set('session.use_trans_sid', 0);
ini_set('url_rewriter.tags', '');
ini_set('session.save_handler', 'user');
ini_set('session.serialize_handler', 'php');
ini_set('session.use_cookies', 1);
ini_set('session.name', Configure::read('Session.cookie'));
ini_set('session.cookie_lifetime', $this->cookieLifeTime);
ini_set('session.cookie_path', $this->path);
ini_set('session.auto_start', 0);
}
}
session_set_save_handler(array('CakeSession','__open'),
array('CakeSession', '__close'),
array('CakeSession', '__read'),
array('CakeSession', '__write'),
array('CakeSession', '__destroy'),
array('CakeSession', '__gc'));
break;
case 'php':
if (empty($_SESSION)) {
if ($iniSet) {
ini_set('session.use_trans_sid', 0);
ini_set('session.name', Configure::read('Session.cookie'));
ini_set('session.cookie_lifetime', $this->cookieLifeTime);
ini_set('session.cookie_path', $this->path);
}
}
break;
case 'cache':
if (empty($_SESSION)) {
if (!class_exists('Cache')) {
require LIBS . 'cache.php';
}
if ($iniSet) {
ini_set('session.use_trans_sid', 0);
ini_set('url_rewriter.tags', '');
ini_set('session.save_handler', 'user');
ini_set('session.use_cookies', 1);
ini_set('session.name', Configure::read('Session.cookie'));
ini_set('session.cookie_lifetime', $this->cookieLifeTime);
ini_set('session.cookie_path', $this->path);
}
}
session_set_save_handler(array('CakeSession','__open'),
array('CakeSession', '__close'),
array('Cache', 'read'),
array('Cache', 'write'),
array('Cache', 'delete'),
array('Cache', 'gc'));
break;
default:
if (empty($_SESSION)) {
$config = CONFIGS . Configure::read('Session.save') . '.php';

if (is_file($config)) {
require_once ($config);
}
}
break;
}
}

/**
* Helper method to start a session
*
* @access private
*/
function __startSession() {
if (headers_sent()) {
if (empty($_SESSION)) {
$_SESSION = array();
}
return false;
} elseif (!isset($_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 = $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) {
$sessionpath = session_save_path();
if (empty($sessionpath)) {
$sessionpath = "/tmp";
}
if (session_id() != "" || isset($_COOKIE[session_name()])) {
setcookie(Configure::read('Session.cookie'), '', time() - 42000, $this->path);
}
session_regenerate_id(true);
if (PHP_VERSION < 5.1) {
$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();
}

/**
* Validate that the $name is in correct dot notation
* example: $name = 'ControllerName.key';
*
* @param string $name Session key names as string.
* @return mixed false is $name is not correct format, or $name if it is correct
* @access private
*/
function __validateKeys($name) {
if (is_string($name) && preg_match("/^[ 0-9a-zA-Z._-]*$/", $name)) {
return $name;
}
$this->__setError(3, "$name is not a string");
return false;
}

/**
* 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 $data The value of the the data to be saved.
* @return boolean True for successful write, false otherwise.
* @access private
*/
function __write($id, $data) {
switch (Configure::read('Security.level')) {
case 'medium':
$factor = 100;
break;
case 'low':
$factor = 300;
break;
case 'high':
default:
$factor = 10;
break;
}

$expires = time() + Configure::read('Session.timeout') * $factor;

$model =& ClassRegistry::getObject('Session');
$return = $model->save(compact('id', '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;
}
}
?>
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