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<?php
/**
* This file is part of SimpleSAMLphp. See the file COPYING in the
* root of the distribution for licence information.
*
* This file defines a base class for session handlers that need to store
* the session id in a cookie. It takes care of storing and retrieving the
* session id.
*
* @author Olav Morken, UNINETT AS. <andreas.solberg@uninett.no>
* @package simpleSAMLphp
* @abstract
*/
abstract class SimpleSAML_SessionHandlerCookie
extends SimpleSAML_SessionHandler {
/* This variable contains the current session id. */
private $session_id = NULL;
/* This variable contains the session cookie name. */
protected $cookie_name;
/* This constructor initializes the session id based on what
* we receive in a cookie. We create a new session id and set
* a cookie with this id if we don't have a session id.
*/
protected function __construct() {
/* Call the constructor in the base class in case it should
* become necessary in the future.
*/
parent::__construct();
$config = SimpleSAML_Configuration::getInstance();
$this->cookie_name = $config->getString('session.cookie.name', 'SimpleSAMLSessionID');
}
/**
* Create and set new session id.
*
* @return string The new session id.
*/
public function newSessionId() {
$this->session_id = self::createSessionID();
SimpleSAML_Session::createSession($this->session_id);
$this->setCookie($this->cookie_name, $this->session_id);
return $this->session_id;
}
/**
* Retrieve the session id of saved in the session cookie.
*
* @return string The session id saved in the cookie.
*/
public function getCookieSessionId() {
if ($this->session_id === NULL) {
if(self::hasSessionCookie()) {
/* Attempt to retrieve the session id from the cookie. */
$this->session_id = $_COOKIE[$this->cookie_name];
}
/* Check if we have a valid session id. */
if(!self::isValidSessionID($this->session_id)) {
/* We don't have a valid session. Create a new session id. */
return self::newSessionId();
}
}
return $this->session_id;
}
/**
* Retrieve the session cookie name.
*
* @return string The session cookie name.
*/
public function getSessionCookieName() {
return $this->cookie_name;
}
/* This static function creates a session id. A session id consists
* of 32 random hexadecimal characters.
*
* Returns:
* A random session id.
*/
private static function createSessionID() {
return bin2hex(openssl_random_pseudo_bytes(16));
}
/* This static function validates a session id. A session id is valid
* if it only consists of characters which are allowed in a session id
* and it is the correct length.
*
* Parameters:
* $session_id The session id we should validate.
*
* Returns:
* TRUE if this session id is valid, FALSE if not.
*/
private static function isValidSessionID($session_id) {
if(!is_string($session_id)) {
return FALSE;
}
if(strlen($session_id) != 32) {
return FALSE;
}
if(preg_match('/[^0-9a-f]/', $session_id)) {
return FALSE;
}
return TRUE;
}
/**
* Check whether the session cookie is set.
*
* This function will only return FALSE if is is certain that the cookie isn't set.
*
* @return bool TRUE if it was set, FALSE if not.
*/
public function hasSessionCookie() {
return array_key_exists($this->cookie_name, $_COOKIE);
}
}
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