447 lines
11 KiB
PHP
447 lines
11 KiB
PHP
|
<?php
|
||
|
|
/**
|
||
|
|
* CodeIgniter
|
||
|
|
*
|
||
|
|
* An open source application development framework for PHP
|
||
|
|
*
|
||
|
|
* This content is released under the MIT License (MIT)
|
||
|
|
*
|
||
|
|
* Copyright (c) 2014 - 2019, British Columbia Institute of Technology
|
||
|
|
*
|
||
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||
|
|
* of this software and associated documentation files (the "Software"), to deal
|
||
|
|
* in the Software without restriction, including without limitation the rights
|
||
|
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||
|
|
* copies of the Software, and to permit persons to whom the Software is
|
||
|
|
* furnished to do so, subject to the following conditions:
|
||
|
|
*
|
||
|
|
* The above copyright notice and this permission notice shall be included in
|
||
|
|
* all copies or substantial portions of the Software.
|
||
|
|
*
|
||
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||
|
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||
|
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||
|
|
* THE SOFTWARE.
|
||
|
|
*
|
||
|
|
* @package CodeIgniter
|
||
|
|
* @author EllisLab Dev Team
|
||
|
|
* @copyright Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)
|
||
|
|
* @copyright Copyright (c) 2014 - 2019, British Columbia Institute of Technology (https://bcit.ca/)
|
||
|
|
* @license https://opensource.org/licenses/MIT MIT License
|
||
|
|
* @link https://codeigniter.com
|
||
|
|
* @since Version 3.0.0
|
||
|
|
* @filesource
|
||
|
|
*/
|
||
|
|
defined('BASEPATH') OR exit('No direct script access allowed');
|
||
|
|
|
||
|
|
/**
|
||
|
|
* CodeIgniter Session Database Driver
|
||
|
|
*
|
||
|
|
* @package CodeIgniter
|
||
|
|
* @subpackage Libraries
|
||
|
|
* @category Sessions
|
||
|
|
* @author Andrey Andreev
|
||
|
|
* @link https://codeigniter.com/user_guide/libraries/sessions.html
|
||
|
|
*/
|
||
|
|
class CI_Session_database_driver extends CI_Session_driver implements SessionHandlerInterface {
|
||
|
|
|
||
|
|
/**
|
||
|
|
* DB object
|
||
|
|
*
|
||
|
|
* @var object
|
||
|
|
*/
|
||
|
|
protected $_db;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Row exists flag
|
||
|
|
*
|
||
|
|
* @var bool
|
||
|
|
*/
|
||
|
|
protected $_row_exists = FALSE;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Lock "driver" flag
|
||
|
|
*
|
||
|
|
* @var string
|
||
|
|
*/
|
||
|
|
protected $_platform;
|
||
|
|
|
||
|
|
// ------------------------------------------------------------------------
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Class constructor
|
||
|
|
*
|
||
|
|
* @param array $params Configuration parameters
|
||
|
|
* @return void
|
||
|
|
*/
|
||
|
|
public function __construct(&$params)
|
||
|
|
{
|
||
|
|
parent::__construct($params);
|
||
|
|
|
||
|
|
$CI =& get_instance();
|
||
|
|
isset($CI->db) OR $CI->load->database();
|
||
|
|
$this->_db = $CI->db;
|
||
|
|
|
||
|
|
if ( ! $this->_db instanceof CI_DB_query_builder)
|
||
|
|
{
|
||
|
|
throw new Exception('Query Builder not enabled for the configured database. Aborting.');
|
||
|
|
}
|
||
|
|
elseif ($this->_db->pconnect)
|
||
|
|
{
|
||
|
|
throw new Exception('Configured database connection is persistent. Aborting.');
|
||
|
|
}
|
||
|
|
elseif ($this->_db->cache_on)
|
||
|
|
{
|
||
|
|
throw new Exception('Configured database connection has cache enabled. Aborting.');
|
||
|
|
}
|
||
|
|
|
||
|
|
$db_driver = $this->_db->dbdriver.(empty($this->_db->subdriver) ? '' : '_'.$this->_db->subdriver);
|
||
|
|
if (strpos($db_driver, 'mysql') !== FALSE)
|
||
|
|
{
|
||
|
|
$this->_platform = 'mysql';
|
||
|
|
}
|
||
|
|
elseif (in_array($db_driver, array('postgre', 'pdo_pgsql'), TRUE))
|
||
|
|
{
|
||
|
|
$this->_platform = 'postgre';
|
||
|
|
}
|
||
|
|
|
||
|
|
// Note: BC work-around for the old 'sess_table_name' setting, should be removed in the future.
|
||
|
|
if ( ! isset($this->_config['save_path']) && ($this->_config['save_path'] = config_item('sess_table_name')))
|
||
|
|
{
|
||
|
|
log_message('debug', 'Session: "sess_save_path" is empty; using BC fallback to "sess_table_name".');
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// ------------------------------------------------------------------------
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Open
|
||
|
|
*
|
||
|
|
* Initializes the database connection
|
||
|
|
*
|
||
|
|
* @param string $save_path Table name
|
||
|
|
* @param string $name Session cookie name, unused
|
||
|
|
* @return bool
|
||
|
|
*/
|
||
|
|
public function open($save_path, $name)
|
||
|
|
{
|
||
|
|
if (empty($this->_db->conn_id) && ! $this->_db->db_connect())
|
||
|
|
{
|
||
|
|
return $this->_fail();
|
||
|
|
}
|
||
|
|
|
||
|
|
$this->php5_validate_id();
|
||
|
|
|
||
|
|
return $this->_success;
|
||
|
|
}
|
||
|
|
|
||
|
|
// ------------------------------------------------------------------------
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Read
|
||
|
|
*
|
||
|
|
* Reads session data and acquires a lock
|
||
|
|
*
|
||
|
|
* @param string $session_id Session ID
|
||
|
|
* @return string Serialized session data
|
||
|
|
*/
|
||
|
|
public function read($session_id)
|
||
|
|
{
|
||
|
|
if ($this->_get_lock($session_id) !== FALSE)
|
||
|
|
{
|
||
|
|
// Prevent previous QB calls from messing with our queries
|
||
|
|
$this->_db->reset_query();
|
||
|
|
|
||
|
|
// Needed by write() to detect session_regenerate_id() calls
|
||
|
|
$this->_session_id = $session_id;
|
||
|
|
|
||
|
|
$this->_db
|
||
|
|
->select('data')
|
||
|
|
->from($this->_config['save_path'])
|
||
|
|
->where('id', $session_id);
|
||
|
|
|
||
|
|
if ($this->_config['match_ip'])
|
||
|
|
{
|
||
|
|
$this->_db->where('ip_address', $_SERVER['REMOTE_ADDR']);
|
||
|
|
}
|
||
|
|
|
||
|
|
if ( ! ($result = $this->_db->get()) OR ($result = $result->row()) === NULL)
|
||
|
|
{
|
||
|
|
// PHP7 will reuse the same SessionHandler object after
|
||
|
|
// ID regeneration, so we need to explicitly set this to
|
||
|
|
// FALSE instead of relying on the default ...
|
||
|
|
$this->_row_exists = FALSE;
|
||
|
|
$this->_fingerprint = md5('');
|
||
|
|
return '';
|
||
|
|
}
|
||
|
|
|
||
|
|
// PostgreSQL's variant of a BLOB datatype is Bytea, which is a
|
||
|
|
// PITA to work with, so we use base64-encoded data in a TEXT
|
||
|
|
// field instead.
|
||
|
|
$result = ($this->_platform === 'postgre')
|
||
|
|
? base64_decode(rtrim($result->data))
|
||
|
|
: $result->data;
|
||
|
|
|
||
|
|
$this->_fingerprint = md5($result);
|
||
|
|
$this->_row_exists = TRUE;
|
||
|
|
return $result;
|
||
|
|
}
|
||
|
|
|
||
|
|
$this->_fingerprint = md5('');
|
||
|
|
return '';
|
||
|
|
}
|
||
|
|
|
||
|
|
// ------------------------------------------------------------------------
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Write
|
||
|
|
*
|
||
|
|
* Writes (create / update) session data
|
||
|
|
*
|
||
|
|
* @param string $session_id Session ID
|
||
|
|
* @param string $session_data Serialized session data
|
||
|
|
* @return bool
|
||
|
|
*/
|
||
|
|
public function write($session_id, $session_data)
|
||
|
|
{
|
||
|
|
// Prevent previous QB calls from messing with our queries
|
||
|
|
$this->_db->reset_query();
|
||
|
|
|
||
|
|
// Was the ID regenerated?
|
||
|
|
if (isset($this->_session_id) && $session_id !== $this->_session_id)
|
||
|
|
{
|
||
|
|
if ( ! $this->_release_lock() OR ! $this->_get_lock($session_id))
|
||
|
|
{
|
||
|
|
return $this->_fail();
|
||
|
|
}
|
||
|
|
|
||
|
|
$this->_row_exists = FALSE;
|
||
|
|
$this->_session_id = $session_id;
|
||
|
|
}
|
||
|
|
elseif ($this->_lock === FALSE)
|
||
|
|
{
|
||
|
|
return $this->_fail();
|
||
|
|
}
|
||
|
|
|
||
|
|
if ($this->_row_exists === FALSE)
|
||
|
|
{
|
||
|
|
$insert_data = array(
|
||
|
|
'id' => $session_id,
|
||
|
|
'ip_address' => $_SERVER['REMOTE_ADDR'],
|
||
|
|
'timestamp' => time(),
|
||
|
|
'data' => ($this->_platform === 'postgre' ? base64_encode($session_data) : $session_data)
|
||
|
|
);
|
||
|
|
|
||
|
|
if ($this->_db->insert($this->_config['save_path'], $insert_data))
|
||
|
|
{
|
||
|
|
$this->_fingerprint = md5($session_data);
|
||
|
|
$this->_row_exists = TRUE;
|
||
|
|
return $this->_success;
|
||
|
|
}
|
||
|
|
|
||
|
|
return $this->_fail();
|
||
|
|
}
|
||
|
|
|
||
|
|
$this->_db->where('id', $session_id);
|
||
|
|
if ($this->_config['match_ip'])
|
||
|
|
{
|
||
|
|
$this->_db->where('ip_address', $_SERVER['REMOTE_ADDR']);
|
||
|
|
}
|
||
|
|
|
||
|
|
$update_data = array('timestamp' => time());
|
||
|
|
if ($this->_fingerprint !== md5($session_data))
|
||
|
|
{
|
||
|
|
$update_data['data'] = ($this->_platform === 'postgre')
|
||
|
|
? base64_encode($session_data)
|
||
|
|
: $session_data;
|
||
|
|
}
|
||
|
|
|
||
|
|
if ($this->_db->update($this->_config['save_path'], $update_data))
|
||
|
|
{
|
||
|
|
$this->_fingerprint = md5($session_data);
|
||
|
|
return $this->_success;
|
||
|
|
}
|
||
|
|
|
||
|
|
return $this->_fail();
|
||
|
|
}
|
||
|
|
|
||
|
|
// ------------------------------------------------------------------------
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Close
|
||
|
|
*
|
||
|
|
* Releases locks
|
||
|
|
*
|
||
|
|
* @return bool
|
||
|
|
*/
|
||
|
|
public function close()
|
||
|
|
{
|
||
|
|
return ($this->_lock && ! $this->_release_lock())
|
||
|
|
? $this->_fail()
|
||
|
|
: $this->_success;
|
||
|
|
}
|
||
|
|
|
||
|
|
// ------------------------------------------------------------------------
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Destroy
|
||
|
|
*
|
||
|
|
* Destroys the current session.
|
||
|
|
*
|
||
|
|
* @param string $session_id Session ID
|
||
|
|
* @return bool
|
||
|
|
*/
|
||
|
|
public function destroy($session_id)
|
||
|
|
{
|
||
|
|
if ($this->_lock)
|
||
|
|
{
|
||
|
|
// Prevent previous QB calls from messing with our queries
|
||
|
|
$this->_db->reset_query();
|
||
|
|
|
||
|
|
$this->_db->where('id', $session_id);
|
||
|
|
if ($this->_config['match_ip'])
|
||
|
|
{
|
||
|
|
$this->_db->where('ip_address', $_SERVER['REMOTE_ADDR']);
|
||
|
|
}
|
||
|
|
|
||
|
|
if ( ! $this->_db->delete($this->_config['save_path']))
|
||
|
|
{
|
||
|
|
return $this->_fail();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if ($this->close() === $this->_success)
|
||
|
|
{
|
||
|
|
$this->_cookie_destroy();
|
||
|
|
return $this->_success;
|
||
|
|
}
|
||
|
|
|
||
|
|
return $this->_fail();
|
||
|
|
}
|
||
|
|
|
||
|
|
// ------------------------------------------------------------------------
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Garbage Collector
|
||
|
|
*
|
||
|
|
* Deletes expired sessions
|
||
|
|
*
|
||
|
|
* @param int $maxlifetime Maximum lifetime of sessions
|
||
|
|
* @return bool
|
||
|
|
*/
|
||
|
|
public function gc($maxlifetime)
|
||
|
|
{
|
||
|
|
// Prevent previous QB calls from messing with our queries
|
||
|
|
$this->_db->reset_query();
|
||
|
|
|
||
|
|
return ($this->_db->delete($this->_config['save_path'], 'timestamp < '.(time() - $maxlifetime)))
|
||
|
|
? $this->_success
|
||
|
|
: $this->_fail();
|
||
|
|
}
|
||
|
|
|
||
|
|
// --------------------------------------------------------------------
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Validate ID
|
||
|
|
*
|
||
|
|
* Checks whether a session ID record exists server-side,
|
||
|
|
* to enforce session.use_strict_mode.
|
||
|
|
*
|
||
|
|
* @param string $id
|
||
|
|
* @return bool
|
||
|
|
*/
|
||
|
|
public function validateSessionId($id)
|
||
|
|
{
|
||
|
|
// Prevent previous QB calls from messing with our queries
|
||
|
|
$this->_db->reset_query();
|
||
|
|
|
||
|
|
$this->_db->select('1')->from($this->_config['save_path'])->where('id', $id);
|
||
|
|
empty($this->_config['match_ip']) OR $this->_db->where('ip_address', $_SERVER['REMOTE_ADDR']);
|
||
|
|
$result = $this->_db->get();
|
||
|
|
empty($result) OR $result = $result->row();
|
||
|
|
|
||
|
|
return ! empty($result);
|
||
|
|
}
|
||
|
|
|
||
|
|
// ------------------------------------------------------------------------
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Get lock
|
||
|
|
*
|
||
|
|
* Acquires a lock, depending on the underlying platform.
|
||
|
|
*
|
||
|
|
* @param string $session_id Session ID
|
||
|
|
* @return bool
|
||
|
|
*/
|
||
|
|
protected function _get_lock($session_id)
|
||
|
|
{
|
||
|
|
if ($this->_platform === 'mysql')
|
||
|
|
{
|
||
|
|
$arg = md5($session_id.($this->_config['match_ip'] ? '_'.$_SERVER['REMOTE_ADDR'] : ''));
|
||
|
|
if ($this->_db->query("SELECT GET_LOCK('".$arg."', 300) AS ci_session_lock")->row()->ci_session_lock)
|
||
|
|
{
|
||
|
|
$this->_lock = $arg;
|
||
|
|
return TRUE;
|
||
|
|
}
|
||
|
|
|
||
|
|
return FALSE;
|
||
|
|
}
|
||
|
|
elseif ($this->_platform === 'postgre')
|
||
|
|
{
|
||
|
|
$arg = "hashtext('".$session_id."')".($this->_config['match_ip'] ? ", hashtext('".$_SERVER['REMOTE_ADDR']."')" : '');
|
||
|
|
if ($this->_db->simple_query('SELECT pg_advisory_lock('.$arg.')'))
|
||
|
|
{
|
||
|
|
$this->_lock = $arg;
|
||
|
|
return TRUE;
|
||
|
|
}
|
||
|
|
|
||
|
|
return FALSE;
|
||
|
|
}
|
||
|
|
|
||
|
|
return parent::_get_lock($session_id);
|
||
|
|
}
|
||
|
|
|
||
|
|
// ------------------------------------------------------------------------
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Release lock
|
||
|
|
*
|
||
|
|
* Releases a previously acquired lock
|
||
|
|
*
|
||
|
|
* @return bool
|
||
|
|
*/
|
||
|
|
protected function _release_lock()
|
||
|
|
{
|
||
|
|
if ( ! $this->_lock)
|
||
|
|
{
|
||
|
|
return TRUE;
|
||
|
|
}
|
||
|
|
|
||
|
|
if ($this->_platform === 'mysql')
|
||
|
|
{
|
||
|
|
if ($this->_db->query("SELECT RELEASE_LOCK('".$this->_lock."') AS ci_session_lock")->row()->ci_session_lock)
|
||
|
|
{
|
||
|
|
$this->_lock = FALSE;
|
||
|
|
return TRUE;
|
||
|
|
}
|
||
|
|
|
||
|
|
return FALSE;
|
||
|
|
}
|
||
|
|
elseif ($this->_platform === 'postgre')
|
||
|
|
{
|
||
|
|
if ($this->_db->simple_query('SELECT pg_advisory_unlock('.$this->_lock.')'))
|
||
|
|
{
|
||
|
|
$this->_lock = FALSE;
|
||
|
|
return TRUE;
|
||
|
|
}
|
||
|
|
|
||
|
|
return FALSE;
|
||
|
|
}
|
||
|
|
|
||
|
|
return parent::_release_lock();
|
||
|
|
}
|
||
|
|
}
|