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422 lines
9.7 KiB
422 lines
9.7 KiB
<?php
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/**
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* CodeIgniter
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*
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* An open source application development framework for PHP
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*
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* This content is released under the MIT License (MIT)
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*
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* Copyright (c) 2014-2019 British Columbia Institute of Technology
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* Copyright (c) 2019 CodeIgniter Foundation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*
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* @package CodeIgniter
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* @author CodeIgniter Dev Team
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* @copyright 2019 CodeIgniter Foundation
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* @license https://opensource.org/licenses/MIT MIT License
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* @link https://codeigniter.com
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* @since Version 4.0.0
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* @filesource
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*/
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namespace CodeIgniter\Session\Handlers;
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use CodeIgniter\Config\BaseConfig;
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use CodeIgniter\Session\Exceptions\SessionException;
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/**
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* Session handler using file system for storage
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*/
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class FileHandler extends BaseHandler implements \SessionHandlerInterface
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{
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/**
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* Where to save the session files to.
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*
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* @var string
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*/
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protected $savePath;
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/**
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* The file handle
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*
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* @var resource
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*/
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protected $fileHandle;
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/**
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* File Name
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*
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* @var resource
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*/
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protected $filePath;
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/**
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* Whether this is a new file.
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*
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* @var boolean
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*/
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protected $fileNew;
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/**
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* Whether IP addresses should be matched.
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*
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* @var boolean
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*/
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protected $matchIP = false;
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//--------------------------------------------------------------------
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/**
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* Constructor
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*
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* @param BaseConfig $config
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* @param string $ipAddress
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*/
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public function __construct($config, string $ipAddress)
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{
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parent::__construct($config, $ipAddress);
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if (! empty($config->sessionSavePath))
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{
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$this->savePath = rtrim($config->sessionSavePath, '/\\');
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ini_set('session.save_path', $config->sessionSavePath);
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}
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else
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{
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$sessionPath = rtrim(ini_get('session.save_path'), '/\\');
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if (! $sessionPath)
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{
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$sessionPath = WRITEPATH . 'session';
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}
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$this->savePath = $sessionPath;
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}
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$this->matchIP = $config->sessionMatchIP;
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$this->configureSessionIDRegex();
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}
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//--------------------------------------------------------------------
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/**
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* Open
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*
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* Sanitizes the save_path directory.
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*
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* @param string $savePath Path to session files' directory
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* @param string $name Session cookie name
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*
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* @return boolean
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* @throws \Exception
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*/
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public function open($savePath, $name): bool
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{
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if (! is_dir($savePath))
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{
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if (! mkdir($savePath, 0700, true))
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{
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throw SessionException::forInvalidSavePath($this->savePath);
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}
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}
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elseif (! is_writable($savePath))
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{
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throw SessionException::forWriteProtectedSavePath($this->savePath);
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}
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$this->savePath = $savePath;
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$this->filePath = $this->savePath . '/'
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. $name // we'll use the session cookie name as a prefix to avoid collisions
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. ($this->matchIP ? md5($this->ipAddress) : '');
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return true;
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}
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//--------------------------------------------------------------------
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/**
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* Read
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*
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* Reads session data and acquires a lock
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*
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* @param string $sessionID Session ID
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*
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* @return string Serialized session data
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*/
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public function read($sessionID): string
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{
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// This might seem weird, but PHP 5.6 introduced session_reset(),
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// which re-reads session data
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if ($this->fileHandle === null)
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{
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$this->fileNew = ! is_file($this->filePath . $sessionID);
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if (($this->fileHandle = fopen($this->filePath . $sessionID, 'c+b')) === false)
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{
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$this->logger->error("Session: Unable to open file '" . $this->filePath . $sessionID . "'.");
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return false;
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}
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if (flock($this->fileHandle, LOCK_EX) === false)
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{
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$this->logger->error("Session: Unable to obtain lock for file '" . $this->filePath . $sessionID . "'.");
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fclose($this->fileHandle);
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$this->fileHandle = null;
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return false;
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}
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// Needed by write() to detect session_regenerate_id() calls
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if (is_null($this->sessionID))
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{
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$this->sessionID = $sessionID;
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}
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if ($this->fileNew)
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{
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chmod($this->filePath . $sessionID, 0600);
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$this->fingerprint = md5('');
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return '';
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}
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}
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else
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{
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rewind($this->fileHandle);
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}
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$session_data = '';
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clearstatcache(); // Address https://github.com/codeigniter4/CodeIgniter4/issues/2056
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for ($read = 0, $length = filesize($this->filePath . $sessionID); $read < $length; $read += strlen($buffer))
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{
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if (($buffer = fread($this->fileHandle, $length - $read)) === false)
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{
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break;
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}
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$session_data .= $buffer;
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}
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$this->fingerprint = md5($session_data);
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return $session_data;
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}
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//--------------------------------------------------------------------
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/**
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* Write
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*
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* Writes (create / update) session data
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*
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* @param string $sessionID Session ID
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* @param string $sessionData Serialized session data
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*
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* @return boolean
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*/
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public function write($sessionID, $sessionData): bool
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{
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// If the two IDs don't match, we have a session_regenerate_id() call
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if ($sessionID !== $this->sessionID)
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{
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$this->sessionID = $sessionID;
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}
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if (! is_resource($this->fileHandle))
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{
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return false;
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}
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elseif ($this->fingerprint === md5($sessionData))
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{
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return ($this->fileNew) ? true : touch($this->filePath . $sessionID);
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}
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if (! $this->fileNew)
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{
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ftruncate($this->fileHandle, 0);
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rewind($this->fileHandle);
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}
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if (($length = strlen($sessionData)) > 0)
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{
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for ($written = 0; $written < $length; $written += $result)
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{
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if (($result = fwrite($this->fileHandle, substr($sessionData, $written))) === false)
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{
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break;
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}
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}
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if (! is_int($result))
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{
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$this->fingerprint = md5(substr($sessionData, 0, $written));
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$this->logger->error('Session: Unable to write data.');
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return false;
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}
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}
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$this->fingerprint = md5($sessionData);
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return true;
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}
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//--------------------------------------------------------------------
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/**
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* Close
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*
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* Releases locks and closes file descriptor.
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*
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* @return boolean
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*/
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public function close(): bool
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{
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if (is_resource($this->fileHandle))
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{
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flock($this->fileHandle, LOCK_UN);
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fclose($this->fileHandle);
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$this->fileHandle = $this->fileNew = null;
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return true;
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}
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return true;
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}
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//--------------------------------------------------------------------
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/**
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* Destroy
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*
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* Destroys the current session.
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*
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* @param string $session_id Session ID
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*
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* @return boolean
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*/
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public function destroy($session_id): bool
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{
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if ($this->close())
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{
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return is_file($this->filePath . $session_id)
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? (unlink($this->filePath . $session_id) && $this->destroyCookie()) : true;
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}
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elseif ($this->filePath !== null)
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{
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clearstatcache();
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return is_file($this->filePath . $session_id)
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? (unlink($this->filePath . $session_id) && $this->destroyCookie()) : true;
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}
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return false;
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}
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//--------------------------------------------------------------------
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/**
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* Garbage Collector
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*
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* Deletes expired sessions
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*
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* @param integer $maxlifetime Maximum lifetime of sessions
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*
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* @return boolean
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*/
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public function gc($maxlifetime): bool
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{
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if (! is_dir($this->savePath) || ($directory = opendir($this->savePath)) === false)
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{
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$this->logger->debug("Session: Garbage collector couldn't list files under directory '" . $this->savePath . "'.");
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return false;
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}
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$ts = time() - $maxlifetime;
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$pattern = $this->matchIP === true
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? '[0-9a-f]{32}'
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: '';
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$pattern = sprintf(
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'#\A%s' . $pattern . $this->sessionIDRegex . '\z#',
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preg_quote($this->cookieName)
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);
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while (($file = readdir($directory)) !== false)
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{
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// If the filename doesn't match this pattern, it's either not a session file or is not ours
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if (! preg_match($pattern, $file)
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|| ! is_file($this->savePath . DIRECTORY_SEPARATOR . $file)
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|| ($mtime = filemtime($this->savePath . DIRECTORY_SEPARATOR . $file)) === false
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|| $mtime > $ts
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)
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{
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continue;
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}
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unlink($this->savePath . DIRECTORY_SEPARATOR . $file);
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}
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closedir($directory);
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return true;
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}
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//--------------------------------------------------------------------
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/**
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* Configure Session ID regular expression
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*/
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protected function configureSessionIDRegex()
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{
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$bitsPerCharacter = (int)ini_get('session.sid_bits_per_character');
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$SIDLength = (int)ini_get('session.sid_length');
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if (($bits = $SIDLength * $bitsPerCharacter) < 160)
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{
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// Add as many more characters as necessary to reach at least 160 bits
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$SIDLength += (int)ceil((160 % $bits) / $bitsPerCharacter);
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ini_set('session.sid_length', $SIDLength);
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}
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// Yes, 4,5,6 are the only known possible values as of 2016-10-27
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switch ($bitsPerCharacter)
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{
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case 4:
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$this->sessionIDRegex = '[0-9a-f]';
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break;
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case 5:
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$this->sessionIDRegex = '[0-9a-v]';
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break;
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case 6:
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$this->sessionIDRegex = '[0-9a-zA-Z,-]';
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break;
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}
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$this->sessionIDRegex .= '{' . $SIDLength . '}';
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}
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}
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