418 lines
10 KiB
PHP
418 lines
10 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 Redis Driver
|
|
*
|
|
* @package CodeIgniter
|
|
* @subpackage Libraries
|
|
* @category Sessions
|
|
* @author Andrey Andreev
|
|
* @link https://codeigniter.com/user_guide/libraries/sessions.html
|
|
*/
|
|
class CI_Session_redis_driver extends CI_Session_driver implements SessionHandlerInterface {
|
|
|
|
/**
|
|
* phpRedis instance
|
|
*
|
|
* @var Redis
|
|
*/
|
|
protected $_redis;
|
|
|
|
/**
|
|
* Key prefix
|
|
*
|
|
* @var string
|
|
*/
|
|
protected $_key_prefix = 'ci_session:';
|
|
|
|
/**
|
|
* Lock key
|
|
*
|
|
* @var string
|
|
*/
|
|
protected $_lock_key;
|
|
|
|
/**
|
|
* Key exists flag
|
|
*
|
|
* @var bool
|
|
*/
|
|
protected $_key_exists = FALSE;
|
|
|
|
// ------------------------------------------------------------------------
|
|
|
|
/**
|
|
* Class constructor
|
|
*
|
|
* @param array $params Configuration parameters
|
|
* @return void
|
|
*/
|
|
public function __construct(&$params)
|
|
{
|
|
parent::__construct($params);
|
|
|
|
if (empty($this->_config['save_path']))
|
|
{
|
|
log_message('error', 'Session: No Redis save path configured.');
|
|
}
|
|
elseif (preg_match('#(?:tcp://)?([^:?]+)(?:\:(\d+))?(\?.+)?#', $this->_config['save_path'], $matches))
|
|
{
|
|
isset($matches[3]) OR $matches[3] = ''; // Just to avoid undefined index notices below
|
|
$this->_config['save_path'] = array(
|
|
'host' => $matches[1],
|
|
'port' => empty($matches[2]) ? NULL : $matches[2],
|
|
'password' => preg_match('#auth=([^\s&]+)#', $matches[3], $match) ? $match[1] : NULL,
|
|
'database' => preg_match('#database=(\d+)#', $matches[3], $match) ? (int) $match[1] : NULL,
|
|
'timeout' => preg_match('#timeout=(\d+\.\d+)#', $matches[3], $match) ? (float) $match[1] : NULL
|
|
);
|
|
|
|
preg_match('#prefix=([^\s&]+)#', $matches[3], $match) && $this->_key_prefix = $match[1];
|
|
}
|
|
else
|
|
{
|
|
log_message('error', 'Session: Invalid Redis save path format: '.$this->_config['save_path']);
|
|
}
|
|
|
|
if ($this->_config['match_ip'] === TRUE)
|
|
{
|
|
$this->_key_prefix .= $_SERVER['REMOTE_ADDR'].':';
|
|
}
|
|
}
|
|
|
|
// ------------------------------------------------------------------------
|
|
|
|
/**
|
|
* Open
|
|
*
|
|
* Sanitizes save_path and initializes connection.
|
|
*
|
|
* @param string $save_path Server path
|
|
* @param string $name Session cookie name, unused
|
|
* @return bool
|
|
*/
|
|
public function open($save_path, $name)
|
|
{
|
|
if (empty($this->_config['save_path']))
|
|
{
|
|
return $this->_fail();
|
|
}
|
|
|
|
$redis = new Redis();
|
|
if ( ! $redis->connect($this->_config['save_path']['host'], $this->_config['save_path']['port'], $this->_config['save_path']['timeout']))
|
|
{
|
|
log_message('error', 'Session: Unable to connect to Redis with the configured settings.');
|
|
}
|
|
elseif (isset($this->_config['save_path']['password']) && ! $redis->auth($this->_config['save_path']['password']))
|
|
{
|
|
log_message('error', 'Session: Unable to authenticate to Redis instance.');
|
|
}
|
|
elseif (isset($this->_config['save_path']['database']) && ! $redis->select($this->_config['save_path']['database']))
|
|
{
|
|
log_message('error', 'Session: Unable to select Redis database with index '.$this->_config['save_path']['database']);
|
|
}
|
|
else
|
|
{
|
|
$this->_redis = $redis;
|
|
return $this->_success;
|
|
}
|
|
|
|
$this->php5_validate_id();
|
|
|
|
return $this->_fail();
|
|
}
|
|
|
|
// ------------------------------------------------------------------------
|
|
|
|
/**
|
|
* 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 (isset($this->_redis) && $this->_get_lock($session_id))
|
|
{
|
|
// Needed by write() to detect session_regenerate_id() calls
|
|
$this->_session_id = $session_id;
|
|
|
|
$session_data = $this->_redis->get($this->_key_prefix.$session_id);
|
|
|
|
is_string($session_data)
|
|
? $this->_key_exists = TRUE
|
|
: $session_data = '';
|
|
|
|
$this->_fingerprint = md5($session_data);
|
|
return $session_data;
|
|
}
|
|
|
|
return $this->_fail();
|
|
}
|
|
|
|
// ------------------------------------------------------------------------
|
|
|
|
/**
|
|
* 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, $session_data)
|
|
{
|
|
if ( ! isset($this->_redis, $this->_lock_key))
|
|
{
|
|
return $this->_fail();
|
|
}
|
|
// Was the ID regenerated?
|
|
elseif ($session_id !== $this->_session_id)
|
|
{
|
|
if ( ! $this->_release_lock() OR ! $this->_get_lock($session_id))
|
|
{
|
|
return $this->_fail();
|
|
}
|
|
|
|
$this->_key_exists = FALSE;
|
|
$this->_session_id = $session_id;
|
|
}
|
|
|
|
$this->_redis->setTimeout($this->_lock_key, 300);
|
|
if ($this->_fingerprint !== ($fingerprint = md5($session_data)) OR $this->_key_exists === FALSE)
|
|
{
|
|
if ($this->_redis->set($this->_key_prefix.$session_id, $session_data, $this->_config['expiration']))
|
|
{
|
|
$this->_fingerprint = $fingerprint;
|
|
$this->_key_exists = TRUE;
|
|
return $this->_success;
|
|
}
|
|
|
|
return $this->_fail();
|
|
}
|
|
|
|
return ($this->_redis->setTimeout($this->_key_prefix.$session_id, $this->_config['expiration']))
|
|
? $this->_success
|
|
: $this->_fail();
|
|
}
|
|
|
|
// ------------------------------------------------------------------------
|
|
|
|
/**
|
|
* Close
|
|
*
|
|
* Releases locks and closes connection.
|
|
*
|
|
* @return bool
|
|
*/
|
|
public function close()
|
|
{
|
|
if (isset($this->_redis))
|
|
{
|
|
try {
|
|
if ($this->_redis->ping() === '+PONG')
|
|
{
|
|
$this->_release_lock();
|
|
if ($this->_redis->close() === FALSE)
|
|
{
|
|
return $this->_fail();
|
|
}
|
|
}
|
|
}
|
|
catch (RedisException $e)
|
|
{
|
|
log_message('error', 'Session: Got RedisException on close(): '.$e->getMessage());
|
|
}
|
|
|
|
$this->_redis = NULL;
|
|
return $this->_success;
|
|
}
|
|
|
|
return $this->_success;
|
|
}
|
|
|
|
// ------------------------------------------------------------------------
|
|
|
|
/**
|
|
* Destroy
|
|
*
|
|
* Destroys the current session.
|
|
*
|
|
* @param string $session_id Session ID
|
|
* @return bool
|
|
*/
|
|
public function destroy($session_id)
|
|
{
|
|
if (isset($this->_redis, $this->_lock_key))
|
|
{
|
|
if (($result = $this->_redis->delete($this->_key_prefix.$session_id)) !== 1)
|
|
{
|
|
log_message('debug', 'Session: Redis::delete() expected to return 1, got '.var_export($result, TRUE).' instead.');
|
|
}
|
|
|
|
$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)
|
|
{
|
|
// Not necessary, Redis takes care of that.
|
|
return $this->_success;
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
return (bool) $this->_redis->exists($this->_key_prefix.$id);
|
|
}
|
|
|
|
// ------------------------------------------------------------------------
|
|
|
|
/**
|
|
* Get lock
|
|
*
|
|
* Acquires an (emulated) lock.
|
|
*
|
|
* @param string $session_id Session ID
|
|
* @return bool
|
|
*/
|
|
protected function _get_lock($session_id)
|
|
{
|
|
// PHP 7 reuses the SessionHandler object on regeneration,
|
|
// so we need to check here if the lock key is for the
|
|
// correct session ID.
|
|
if ($this->_lock_key === $this->_key_prefix.$session_id.':lock')
|
|
{
|
|
return $this->_redis->setTimeout($this->_lock_key, 300);
|
|
}
|
|
|
|
// 30 attempts to obtain a lock, in case another request already has it
|
|
$lock_key = $this->_key_prefix.$session_id.':lock';
|
|
$attempt = 0;
|
|
do
|
|
{
|
|
if (($ttl = $this->_redis->ttl($lock_key)) > 0)
|
|
{
|
|
sleep(1);
|
|
continue;
|
|
}
|
|
|
|
$result = ($ttl === -2)
|
|
? $this->_redis->set($lock_key, time(), array('nx', 'ex' => 300))
|
|
: $this->_redis->setex($lock_key, 300, time());
|
|
|
|
if ( ! $result)
|
|
{
|
|
log_message('error', 'Session: Error while trying to obtain lock for '.$this->_key_prefix.$session_id);
|
|
return FALSE;
|
|
}
|
|
|
|
$this->_lock_key = $lock_key;
|
|
break;
|
|
}
|
|
while (++$attempt < 30);
|
|
|
|
if ($attempt === 30)
|
|
{
|
|
log_message('error', 'Session: Unable to obtain lock for '.$this->_key_prefix.$session_id.' after 30 attempts, aborting.');
|
|
return FALSE;
|
|
}
|
|
elseif ($ttl === -1)
|
|
{
|
|
log_message('debug', 'Session: Lock for '.$this->_key_prefix.$session_id.' had no TTL, overriding.');
|
|
}
|
|
|
|
$this->_lock = TRUE;
|
|
return TRUE;
|
|
}
|
|
|
|
// ------------------------------------------------------------------------
|
|
|
|
/**
|
|
* Release lock
|
|
*
|
|
* Releases a previously acquired lock
|
|
*
|
|
* @return bool
|
|
*/
|
|
protected function _release_lock()
|
|
{
|
|
if (isset($this->_redis, $this->_lock_key) && $this->_lock)
|
|
{
|
|
if ( ! $this->_redis->delete($this->_lock_key))
|
|
{
|
|
log_message('error', 'Session: Error while trying to free lock for '.$this->_lock_key);
|
|
return FALSE;
|
|
}
|
|
|
|
$this->_lock_key = NULL;
|
|
$this->_lock = FALSE;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
}
|