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<?php /** * CodeIgniter * * An open source application development framework for PHP * * This content is released under the MIT License (MIT) * * Copyright (c) 2014 - 2018, 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 - 2018, British Columbia Institute of Technology (http://bcit.ca/) * @license http://opensource.org/licenses/MIT MIT License * @link https://codeigniter.com * @since Version 2.0.0 * @filesource */ defined('BASEPATH') OR exit('No direct script access allowed'); /** * CodeIgniter Session Class * * @package CodeIgniter * @subpackage Libraries * @category Sessions * @author Andrey Andreev * @link https://codeigniter.com/user_guide/libraries/sessions.html */ class CI_Session { /** * Userdata array * * Just a reference to $_SESSION, for BC purposes. */ public $userdata; protected $_driver = 'files'; protected $_config; protected $_sid_regexp; // ------------------------------------------------------------------------ /** * Class constructor * * @param array $params Configuration parameters * @return void */ public function __construct(array $params = array()) { // No sessions under CLI if (is_cli()) { log_message('debug', 'Session: Initialization under CLI aborted.'); return; } elseif ((bool) ini_get('session.auto_start')) { log_message('error', 'Session: session.auto_start is enabled in php.ini. Aborting.'); return; } elseif ( ! empty($params['driver'])) { $this->_driver = $params['driver']; unset($params['driver']); } elseif ($driver = config_item('sess_driver')) { $this->_driver = $driver; } // Note: BC workaround elseif (config_item('sess_use_database')) { log_message('debug', 'Session: "sess_driver" is empty; using BC fallback to "sess_use_database".'); $this->_driver = 'database'; } $class = $this->_ci_load_classes($this->_driver); // Configuration ... $this->_configure($params); $this->_config['_sid_regexp'] = $this->_sid_regexp; $class = new $class($this->_config); if ($class instanceof SessionHandlerInterface) { if (is_php('5.4')) { session_set_save_handler($class, TRUE); } else { session_set_save_handler( array($class, 'open'), array($class, 'close'), array($class, 'read'), array($class, 'write'), array($class, 'destroy'), array($class, 'gc') ); register_shutdown_function('session_write_close'); } } else { log_message('error', "Session: Driver '".$this->_driver."' doesn't implement SessionHandlerInterface. Aborting."); return; } // Sanitize the cookie, because apparently PHP doesn't do that for userspace handlers if (isset($_COOKIE[$this->_config['cookie_name']]) && ( ! is_string($_COOKIE[$this->_config['cookie_name']]) OR ! preg_match('#\A'.$this->_sid_regexp.'\z#', $_COOKIE[$this->_config['cookie_name']]) ) ) { unset($_COOKIE[$this->_config['cookie_name']]); } session_start(); // Is session ID auto-regeneration configured? (ignoring ajax requests) if ((empty($_SERVER['HTTP_X_REQUESTED_WITH']) OR strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) !== 'xmlhttprequest') && ($regenerate_time = config_item('sess_time_to_update')) > 0 ) { if ( ! isset($_SESSION['__ci_last_regenerate'])) { $_SESSION['__ci_last_regenerate'] = time(); } elseif ($_SESSION['__ci_last_regenerate'] < (time() - $regenerate_time)) { $this->sess_regenerate((bool) config_item('sess_regenerate_destroy')); } } // Another work-around ... PHP doesn't seem to send the session cookie // unless it is being currently created or regenerated elseif (isset($_COOKIE[$this->_config['cookie_name']]) && $_COOKIE[$this->_config['cookie_name']] === session_id()) { setcookie( $this->_config['cookie_name'], session_id(), (empty($this->_config['cookie_lifetime']) ? 0 : time() + $this->_config['cookie_lifetime']), $this->_config['cookie_path'], $this->_config['cookie_domain'], $this->_config['cookie_secure'], TRUE ); } $this->_ci_init_vars(); log_message('info', "Session: Class initialized using '".$this->_driver."' driver."); } // ------------------------------------------------------------------------ /** * CI Load Classes * * An internal method to load all possible dependency and extension * classes. It kind of emulates the CI_Driver library, but is * self-sufficient. * * @param string $driver Driver name * @return string Driver class name */ protected function _ci_load_classes($driver) { // PHP 5.4 compatibility interface_exists('SessionHandlerInterface', FALSE) OR require_once(BASEPATH.'libraries/Session/SessionHandlerInterface.php'); $prefix = config_item('subclass_prefix'); if ( ! class_exists('CI_Session_driver', FALSE)) { require_once( file_exists(APPPATH.'libraries/Session/Session_driver.php') ? APPPATH.'libraries/Session/Session_driver.php' : BASEPATH.'libraries/Session/Session_driver.php' ); if (file_exists($file_path = APPPATH.'libraries/Session/'.$prefix.'Session_driver.php')) { require_once($file_path); } } $class = 'Session_'.$driver.'_driver'; // Allow custom drivers without the CI_ or MY_ prefix if ( ! class_exists($class, FALSE) && file_exists($file_path = APPPATH.'libraries/Session/drivers/'.$class.'.php')) { require_once($file_path); if (class_exists($class, FALSE)) { return $class; } } if ( ! class_exists('CI_'.$class, FALSE)) { if (file_exists($file_path = APPPATH.'libraries/Session/drivers/'.$class.'.php') OR file_exists($file_path = BASEPATH.'libraries/Session/drivers/'.$class.'.php')) { require_once($file_path); } if ( ! class_exists('CI_'.$class, FALSE) && ! class_exists($class, FALSE)) { throw new UnexpectedValueException("Session: Configured driver '".$driver."' was not found. Aborting."); } } if ( ! class_exists($prefix.$class, FALSE) && file_exists($file_path = APPPATH.'libraries/Session/drivers/'.$prefix.$class.'.php')) { require_once($file_path); if (class_exists($prefix.$class, FALSE)) { return $prefix.$class; } log_message('debug', 'Session: '.$prefix.$class.".php found but it doesn't declare class ".$prefix.$class.'.'); } return 'CI_'.$class; } // ------------------------------------------------------------------------ /** * Configuration * * Handle input parameters and configuration defaults * * @param array &$params Input parameters * @return void */ protected function _configure(&$params) { $expiration = config_item('sess_expiration'); if (isset($params['cookie_lifetime'])) { $params['cookie_lifetime'] = (int) $params['cookie_lifetime']; } else { $params['cookie_lifetime'] = ( ! isset($expiration) && config_item('sess_expire_on_close')) ? 0 : (int) $expiration; } isset($params['cookie_name']) OR $params['cookie_name'] = config_item('sess_cookie_name'); if (empty($params['cookie_name'])) { $params['cookie_name'] = ini_get('session.name'); } else { ini_set('session.name', $params['cookie_name']); } isset($params['cookie_path']) OR $params['cookie_path'] = config_item('cookie_path'); isset($params['cookie_domain']) OR $params['cookie_domain'] = config_item('cookie_domain'); isset($params['cookie_secure']) OR $params['cookie_secure'] = (bool) config_item('cookie_secure'); session_set_cookie_params( $params['cookie_lifetime'], $params['cookie_path'], $params['cookie_domain'], $params['cookie_secure'], TRUE // HttpOnly; Yes, this is intentional and not configurable for security reasons ); if (empty($expiration)) { $params['expiration'] = (int) ini_get('session.gc_maxlifetime'); } else { $params['expiration'] = (int) $expiration; ini_set('session.gc_maxlifetime', $expiration); } $params['match_ip'] = (bool) (isset($params['match_ip']) ? $params['match_ip'] : config_item('sess_match_ip')); isset($params['save_path']) OR $params['save_path'] = config_item('sess_save_path'); $this->_config = $params; // Security is king ini_set('session.use_trans_sid', 0); ini_set('session.use_strict_mode', 1); ini_set('session.use_cookies', 1); ini_set('session.use_only_cookies', 1); $this->_configure_sid_length(); } // ------------------------------------------------------------------------ /** * Configure session ID length * * To make life easier, we used to force SHA-1 and 4 bits per * character on everyone. And of course, someone was unhappy. * * Then PHP 7.1 broke backwards-compatibility because ext/session * is such a mess that nobody wants to touch it with a pole stick, * and the one guy who does, nobody has the energy to argue with. * * So we were forced to make changes, and OF COURSE something was * going to break and now we have this pile of shit. -- Narf * * @return void */ protected function _configure_sid_length() { if (PHP_VERSION_ID < 70100) { $hash_function = ini_get('session.hash_function'); if (ctype_digit($hash_function)) { if ($hash_function !== '1') { ini_set('session.hash_function', 1); } $bits = 160; } elseif ( ! in_array($hash_function, hash_algos(), TRUE)) { ini_set('session.hash_function', 1); $bits = 160; } elseif (($bits = strlen(hash($hash_function, 'dummy', false)) * 4) < 160) { ini_set('session.hash_function', 1); $bits = 160; } $bits_per_character = (int) ini_get('session.hash_bits_per_character'); $sid_length = (int) ceil($bits / $bits_per_character); } else { $bits_per_character = (int) ini_get('session.sid_bits_per_character'); $sid_length = (int) ini_get('session.sid_length'); if (($bits = $sid_length * $bits_per_character) < 160) { // Add as many more characters as necessary to reach at least 160 bits $sid_length += (int) ceil((160 % $bits) / $bits_per_character); ini_set('session.sid_length', $sid_length); } } // Yes, 4,5,6 are the only known possible values as of 2016-10-27 switch ($bits_per_character) { case 4: $this->_sid_regexp = '[0-9a-f]'; break; case 5: $this->_sid_regexp = '[0-9a-v]'; break; case 6: $this->_sid_regexp = '[0-9a-zA-Z,-]'; break; } $this->_sid_regexp .= '{'.$sid_length.'}'; } // ------------------------------------------------------------------------ /** * Handle temporary variables * * Clears old "flash" data, marks the new one for deletion and handles * "temp" data deletion. * * @return void */ protected function _ci_init_vars() { if ( ! empty($_SESSION['__ci_vars'])) { $current_time = time(); foreach ($_SESSION['__ci_vars'] as $key => &$value) { if ($value === 'new') { $_SESSION['__ci_vars'][$key] = 'old'; } // Hacky, but 'old' will (implicitly) always be less than time() ;) // DO NOT move this above the 'new' check! elseif ($value < $current_time) { unset($_SESSION[$key], $_SESSION['__ci_vars'][$key]); } } if (empty($_SESSION['__ci_vars'])) { unset($_SESSION['__ci_vars']); } } $this->userdata =& $_SESSION; } // ------------------------------------------------------------------------ /** * Mark as flash * * @param mixed $key Session data key(s) * @return bool */ public function mark_as_flash($key) { if (is_array($key)) { for ($i = 0, $c = count($key); $i < $c; $i++) { if ( ! isset($_SESSION[$key[$i]])) { return FALSE; } } $new = array_fill_keys($key, 'new'); $_SESSION['__ci_vars'] = isset($_SESSION['__ci_vars']) ? array_merge($_SESSION['__ci_vars'], $new) : $new; return TRUE; } if ( ! isset($_SESSION[$key])) { return FALSE; } $_SESSION['__ci_vars'][$key] = 'new'; return TRUE; } // ------------------------------------------------------------------------ /** * Get flash keys * * @return array */ public function get_flash_keys() { if ( ! isset($_SESSION['__ci_vars'])) { return array(); } $keys = array(); foreach (array_keys($_SESSION['__ci_vars']) as $key) { is_int($_SESSION['__ci_vars'][$key]) OR $keys[] = $key; } return $keys; } // ------------------------------------------------------------------------ /** * Unmark flash * * @param mixed $key Session data key(s) * @return void */ public function unmark_flash($key) { if (empty($_SESSION['__ci_vars'])) { return; } is_array($key) OR $key = array($key); foreach ($key as $k) { if (isset($_SESSION['__ci_vars'][$k]) && ! is_int($_SESSION['__ci_vars'][$k])) { unset($_SESSION['__ci_vars'][$k]); } } if (empty($_SESSION['__ci_vars'])) { unset($_SESSION['__ci_vars']); } } // ------------------------------------------------------------------------ /** * Mark as temp * * @param mixed $key Session data key(s) * @param int $ttl Time-to-live in seconds * @return bool */ public function mark_as_temp($key, $ttl = 300) { $ttl += time(); if (is_array($key)) { $temp = array(); foreach ($key as $k => $v) { // Do we have a key => ttl pair, or just a key? if (is_int($k)) { $k = $v; $v = $ttl; } else { $v += time(); } if ( ! isset($_SESSION[$k])) { return FALSE; } $temp[$k] = $v; } $_SESSION['__ci_vars'] = isset($_SESSION['__ci_vars']) ? array_merge($_SESSION['__ci_vars'], $temp) : $temp; return TRUE; } if ( ! isset($_SESSION[$key])) { return FALSE; } $_SESSION['__ci_vars'][$key] = $ttl; return TRUE; } // ------------------------------------------------------------------------ /** * Get temp keys * * @return array */ public function get_temp_keys() { if ( ! isset($_SESSION['__ci_vars'])) { return array(); } $keys = array(); foreach (array_keys($_SESSION['__ci_vars']) as $key) { is_int($_SESSION['__ci_vars'][$key]) && $keys[] = $key; } return $keys; } // ------------------------------------------------------------------------ /** * Unmark temp * * @param mixed $key Session data key(s) * @return void */ public function unmark_temp($key) { if (empty($_SESSION['__ci_vars'])) { return; } is_array($key) OR $key = array($key); foreach ($key as $k) { if (isset($_SESSION['__ci_vars'][$k]) && is_int($_SESSION['__ci_vars'][$k])) { unset($_SESSION['__ci_vars'][$k]); } } if (empty($_SESSION['__ci_vars'])) { unset($_SESSION['__ci_vars']); } } // ------------------------------------------------------------------------ /** * __get() * * @param string $key 'session_id' or a session data key * @return mixed */ public function __get($key) { // Note: Keep this order the same, just in case somebody wants to // use 'session_id' as a session data key, for whatever reason if (isset($_SESSION[$key])) { return $_SESSION[$key]; } elseif ($key === 'session_id') { return session_id(); } return NULL; } // ------------------------------------------------------------------------ /** * __isset() * * @param string $key 'session_id' or a session data key * @return bool */ public function __isset($key) { if ($key === 'session_id') { return (session_status() === PHP_SESSION_ACTIVE); } return isset($_SESSION[$key]); } // ------------------------------------------------------------------------ /** * __set() * * @param string $key Session data key * @param mixed $value Session data value * @return void */ public function __set($key, $value) { $_SESSION[$key] = $value; } // ------------------------------------------------------------------------ /** * Session destroy * * Legacy CI_Session compatibility method * * @return void */ public function sess_destroy() { session_destroy(); } // ------------------------------------------------------------------------ /** * Session regenerate * * Legacy CI_Session compatibility method * * @param bool $destroy Destroy old session data flag * @return void */ public function sess_regenerate($destroy = FALSE) { $_SESSION['__ci_last_regenerate'] = time(); session_regenerate_id($destroy); } // ------------------------------------------------------------------------ /** * Get userdata reference * * Legacy CI_Session compatibility method * * @returns array */ public function &get_userdata() { return $_SESSION; } // ------------------------------------------------------------------------ /** * Userdata (fetch) * * Legacy CI_Session compatibility method * * @param string $key Session data key * @return mixed Session data value or NULL if not found */ public function userdata($key = NULL) { if (isset($key)) { return isset($_SESSION[$key]) ? $_SESSION[$key] : NULL; } elseif (empty($_SESSION)) { return array(); } $userdata = array(); $_exclude = array_merge( array('__ci_vars'), $this->get_flash_keys(), $this->get_temp_keys() ); foreach (array_keys($_SESSION) as $key) { if ( ! in_array($key, $_exclude, TRUE)) { $userdata[$key] = $_SESSION[$key]; } } return $userdata; } // ------------------------------------------------------------------------ /** * Set userdata * * Legacy CI_Session compatibility method * * @param mixed $data Session data key or an associative array * @param mixed $value Value to store * @return void */ public function set_userdata($data, $value = NULL) { if (is_array($data)) { foreach ($data as $key => &$value) { $_SESSION[$key] = $value; } return; } $_SESSION[$data] = $value; } // ------------------------------------------------------------------------ /** * Unset userdata * * Legacy CI_Session compatibility method * * @param mixed $key Session data key(s) * @return void */ public function unset_userdata($key) { if (is_array($key)) { foreach ($key as $k) { unset($_SESSION[$k]); } return; } unset($_SESSION[$key]); } // ------------------------------------------------------------------------ /** * All userdata (fetch) * * Legacy CI_Session compatibility method * * @return array $_SESSION, excluding flash data items */ public function all_userdata() { return $this->userdata(); } // ------------------------------------------------------------------------ /** * Has userdata * * Legacy CI_Session compatibility method * * @param string $key Session data key * @return bool */ public function has_userdata($key) { return isset($_SESSION[$key]); } // ------------------------------------------------------------------------ /** * Flashdata (fetch) * * Legacy CI_Session compatibility method * * @param string $key Session data key * @return mixed Session data value or NULL if not found */ public function flashdata($key = NULL) { if (isset($key)) { return (isset($_SESSION['__ci_vars'], $_SESSION['__ci_vars'][$key], $_SESSION[$key]) && ! is_int($_SESSION['__ci_vars'][$key])) ? $_SESSION[$key] : NULL; } $flashdata = array(); if ( ! empty($_SESSION['__ci_vars'])) { foreach ($_SESSION['__ci_vars'] as $key => &$value) { is_int($value) OR $flashdata[$key] = $_SESSION[$key]; } } return $flashdata; } // ------------------------------------------------------------------------ /** * Set flashdata * * Legacy CI_Session compatibility method * * @param mixed $data Session data key or an associative array * @param mixed $value Value to store * @return void */ public function set_flashdata($data, $value = NULL) { $this->set_userdata($data, $value); $this->mark_as_flash(is_array($data) ? array_keys($data) : $data); } // ------------------------------------------------------------------------ /** * Keep flashdata * * Legacy CI_Session compatibility method * * @param mixed $key Session data key(s) * @return void */ public function keep_flashdata($key) { $this->mark_as_flash($key); } // ------------------------------------------------------------------------ /** * Temp data (fetch) * * Legacy CI_Session compatibility method * * @param string $key Session data key * @return mixed Session data value or NULL if not found */ public function tempdata($key = NULL) { if (isset($key)) { return (isset($_SESSION['__ci_vars'], $_SESSION['__ci_vars'][$key], $_SESSION[$key]) && is_int($_SESSION['__ci_vars'][$key])) ? $_SESSION[$key] : NULL; } $tempdata = array(); if ( ! empty($_SESSION['__ci_vars'])) { foreach ($_SESSION['__ci_vars'] as $key => &$value) { is_int($value) && $tempdata[$key] = $_SESSION[$key]; } } return $tempdata; } // ------------------------------------------------------------------------ /** * Set tempdata * * Legacy CI_Session compatibility method * * @param mixed $data Session data key or an associative array of items * @param mixed $value Value to store * @param int $ttl Time-to-live in seconds * @return void */ public function set_tempdata($data, $value = NULL, $ttl = 300) { $this->set_userdata($data, $value); $this->mark_as_temp(is_array($data) ? array_keys($data) : $data, $ttl); } // ------------------------------------------------------------------------ /** * Unset tempdata * * Legacy CI_Session compatibility method * * @param mixed $data Session data key(s) * @return void */ public function unset_tempdata($key) { $this->unmark_temp($key); } }