diff options
Diffstat (limited to 'system/libraries/Session/drivers/Session_cookie.php')
| -rw-r--r-- | system/libraries/Session/drivers/Session_cookie.php | 805 |
1 files changed, 0 insertions, 805 deletions
diff --git a/system/libraries/Session/drivers/Session_cookie.php b/system/libraries/Session/drivers/Session_cookie.php deleted file mode 100644 index 566c40bd8..000000000 --- a/system/libraries/Session/drivers/Session_cookie.php +++ /dev/null @@ -1,805 +0,0 @@ -<?php -/** - * CodeIgniter - * - * An open source application development framework for PHP 5.2.4 or newer - * - * NOTICE OF LICENSE - * - * Licensed under the Open Software License version 3.0 - * - * This source file is subject to the Open Software License (OSL 3.0) that is - * bundled with this package in the files license.txt / license.rst. It is - * also available through the world wide web at this URL: - * http://opensource.org/licenses/OSL-3.0 - * If you did not receive a copy of the license and are unable to obtain it - * through the world wide web, please send an email to - * licensing@ellislab.com so we can send you a copy immediately. - * - * @package CodeIgniter - * @author EllisLab Dev Team - * @copyright Copyright (c) 2008 - 2014, EllisLab, Inc. (http://ellislab.com/) - * @license http://opensource.org/licenses/OSL-3.0 Open Software License (OSL 3.0) - * @link http://codeigniter.com - * @since Version 1.0 - * @filesource - */ -defined('BASEPATH') OR exit('No direct script access allowed'); - -/** - * Cookie-based session management driver - * - * This is the classic CI_Session functionality, as written by EllisLab, abstracted out to a driver. - * - * @package CodeIgniter - * @subpackage Libraries - * @category Sessions - * @author EllisLab Dev Team - * @link http://codeigniter.com/user_guide/libraries/sessions.html - */ -class CI_Session_cookie extends CI_Session_driver { - - /** - * Whether to encrypt the session cookie - * - * @var bool - */ - public $sess_encrypt_cookie = FALSE; - - /** - * Whether to use to the database for session storage - * - * @var bool - */ - public $sess_use_database = FALSE; - - /** - * Name of the database table in which to store sessions - * - * @var string - */ - public $sess_table_name = ''; - - /** - * Length of time (in seconds) for sessions to expire - * - * @var int - */ - public $sess_expiration = 7200; - - /** - * Whether to kill session on close of browser window - * - * @var bool - */ - public $sess_expire_on_close = FALSE; - - /** - * Whether to match session on ip address - * - * @var bool - */ - public $sess_match_ip = FALSE; - - /** - * Whether to match session on user-agent - * - * @var bool - */ - public $sess_match_useragent = TRUE; - - /** - * Name of session cookie - * - * @var string - */ - public $sess_cookie_name = 'ci_session'; - - /** - * Session cookie prefix - * - * @var string - */ - public $cookie_prefix = ''; - - /** - * Session cookie path - * - * @var string - */ - public $cookie_path = ''; - - /** - * Session cookie domain - * - * @var string - */ - public $cookie_domain = ''; - - /** - * Whether to set the cookie only on HTTPS connections - * - * @var bool - */ - public $cookie_secure = FALSE; - - /** - * Whether cookie should be allowed only to be sent by the server - * - * @var bool - */ - public $cookie_httponly = FALSE; - - /** - * Interval at which to update session - * - * @var int - */ - public $sess_time_to_update = 300; - - /** - * Key with which to encrypt the session cookie - * - * @var string - */ - public $encryption_key = ''; - - /** - * Timezone to use for the current time - * - * @var string - */ - public $time_reference = 'local'; - - /** - * Session data - * - * @var array - */ - public $userdata = array(); - - /** - * Current time - * - * @var int - */ - public $now; - - // ------------------------------------------------------------------------ - - /** - * Default userdata keys - * - * @var array - */ - protected $defaults = array( - 'session_id' => NULL, - 'ip_address' => NULL, - 'user_agent' => NULL, - 'last_activity' => NULL - ); - - /** - * Data needs DB update flag - * - * @var bool - */ - protected $data_dirty = FALSE; - - /** - * Standardize newlines flag - * - * @var bool - */ - protected $_standardize_newlines; - - // ------------------------------------------------------------------------ - - /** - * Initialize session driver object - * - * @return void - */ - protected function initialize() - { - // Set all the session preferences, which can either be set - // manually via the $params array or via the config file - $prefs = array( - 'sess_encrypt_cookie', - 'sess_use_database', - 'sess_table_name', - 'sess_expiration', - 'sess_expire_on_close', - 'sess_match_ip', - 'sess_match_useragent', - 'sess_cookie_name', - 'cookie_path', - 'cookie_domain', - 'cookie_secure', - 'cookie_httponly', - 'sess_time_to_update', - 'time_reference', - 'cookie_prefix', - 'encryption_key', - ); - - $this->_standardize_newlines = (bool) config_item('standardize_newlines'); - - foreach ($prefs as $key) - { - $this->$key = isset($this->_parent->params[$key]) - ? $this->_parent->params[$key] - : $this->CI->config->item($key); - } - - if (empty($this->encryption_key)) - { - show_error('In order to use the Cookie Session driver you are required to set an encryption key in your config file.'); - } - - // Do we need encryption? If so, load the encryption class - if ($this->sess_encrypt_cookie === TRUE) - { - $this->CI->load->library('encryption'); - } - - // Check for database - if ($this->sess_use_database === TRUE && $this->sess_table_name !== '') - { - // Load database driver - $this->CI->load->database(); - - // Register shutdown function - register_shutdown_function(array($this, '_update_db')); - } - - // Set the "now" time. Can either be GMT or server time, based on the config prefs. - // We use this to set the "last activity" time - $this->now = $this->_get_time(); - - // Set the session length. If the session expiration is - // set to zero we'll set the expiration two years from now. - if ($this->sess_expiration === 0) - { - $this->sess_expiration = (60*60*24*365*2); - } - - // Set the cookie name - $this->sess_cookie_name = $this->cookie_prefix.$this->sess_cookie_name; - - // Run the Session routine. If a session doesn't exist we'll - // create a new one. If it does, we'll update it. - if ( ! $this->_sess_read()) - { - $this->_sess_create(); - } - else - { - $this->_sess_update(); - } - - // Delete expired sessions if necessary - $this->_sess_gc(); - } - - // ------------------------------------------------------------------------ - - /** - * Write the session data - * - * @return void - */ - public function sess_save() - { - // Check for database - if ($this->sess_use_database === TRUE) - { - // Mark custom data as dirty so we know to update the DB - $this->data_dirty = TRUE; - } - - // Write the cookie - $this->_set_cookie(); - } - - // ------------------------------------------------------------------------ - - /** - * Destroy the current session - * - * @return void - */ - public function sess_destroy() - { - // Kill the session DB row - if ($this->sess_use_database === TRUE && isset($this->userdata['session_id'])) - { - $this->CI->db->delete($this->sess_table_name, array('session_id' => $this->userdata['session_id'])); - $this->data_dirty = FALSE; - } - - // Kill the cookie - $this->_setcookie($this->sess_cookie_name, '', ($this->now - 31500000), - $this->cookie_path, $this->cookie_domain, 0); - - // Kill session data - $this->userdata = array(); - } - - // ------------------------------------------------------------------------ - - /** - * Regenerate the current session - * - * Regenerate the session id - * - * @param bool Destroy session data flag (default: false) - * @return void - */ - public function sess_regenerate($destroy = FALSE) - { - // Check destroy flag - if ($destroy) - { - // Destroy old session and create new one - $this->sess_destroy(); - $this->_sess_create(); - } - else - { - // Just force an update to recreate the id - $this->_sess_update(TRUE); - } - } - - // ------------------------------------------------------------------------ - - /** - * Get a reference to user data array - * - * @return array Reference to userdata - */ - public function &get_userdata() - { - return $this->userdata; - } - - // ------------------------------------------------------------------------ - - /** - * Fetch the current session data if it exists - * - * @return bool - */ - protected function _sess_read() - { - // Fetch the cookie - $session = $this->CI->input->cookie($this->sess_cookie_name); - - // No cookie? Goodbye cruel world!... - if ($session === NULL) - { - log_message('debug', 'A session cookie was not found.'); - return FALSE; - } - - if ($this->sess_encrypt_cookie === TRUE) - { - $session = $this->CI->encryption->decrypt($session); - if ($session === FALSE) - { - log_message('error', 'Session: Unable to decrypt the session cookie, possibly due to a HMAC mismatch.'); - return FALSE; - } - } - else - { - if (($len = strlen($session) - 40) <= 0) - { - log_message('error', 'Session: The session cookie was not signed.'); - return FALSE; - } - - // Check cookie authentication - $hmac = substr($session, $len); - $session = substr($session, 0, $len); - - // Time-attack-safe comparison - $hmac_check = hash_hmac('sha1', $session, $this->encryption_key); - $diff = 0; - for ($i = 0; $i < 40; $i++) - { - $diff |= ord($hmac[$i]) ^ ord($hmac_check[$i]); - } - - if ($diff !== 0) - { - log_message('error', 'Session: HMAC mismatch. The session cookie data did not match what was expected.'); - $this->sess_destroy(); - return FALSE; - } - } - - // Unserialize the session array - $session = @unserialize($session); - - // Is the session data we unserialized an array with the correct format? - if ( ! is_array($session) OR ! isset($session['session_id'], $session['ip_address'], $session['user_agent'], $session['last_activity'])) - { - log_message('debug', 'Session: Wrong cookie data format'); - $this->sess_destroy(); - return FALSE; - } - - // Is the session current? - if (($session['last_activity'] + $this->sess_expiration) < $this->now OR $session['last_activity'] > $this->now) - { - log_message('debug', 'Session: Expired'); - $this->sess_destroy(); - return FALSE; - } - - // Does the IP match? - if ($this->sess_match_ip === TRUE && $session['ip_address'] !== $this->CI->input->ip_address()) - { - log_message('debug', 'Session: IP address mismatch'); - $this->sess_destroy(); - return FALSE; - } - - // Does the User Agent Match? - if ($this->sess_match_useragent === TRUE && - trim($session['user_agent']) !== trim(substr($this->CI->input->user_agent(), 0, 120))) - { - log_message('debug', 'Session: User Agent string mismatch'); - $this->sess_destroy(); - return FALSE; - } - - // Is there a corresponding session in the DB? - if ($this->sess_use_database === TRUE) - { - $this->CI->db->where('session_id', $session['session_id']); - - if ($this->sess_match_ip === TRUE) - { - $this->CI->db->where('ip_address', $session['ip_address']); - } - - if ($this->sess_match_useragent === TRUE) - { - $this->CI->db->where('user_agent', $session['user_agent']); - } - - // Is caching in effect? Turn it off - $db_cache = $this->CI->db->cache_on; - $this->CI->db->cache_off(); - - $query = $this->CI->db->limit(1)->get($this->sess_table_name); - - // Was caching in effect? - if ($db_cache) - { - // Turn it back on - $this->CI->db->cache_on(); - } - - // No result? Kill it! - if (empty($query) OR $query->num_rows() === 0) - { - log_message('debug', 'Session: No match found in our database'); - $this->sess_destroy(); - return FALSE; - } - - // Is there custom data? If so, add it to the main session array - $row = $query->row(); - if ( ! empty($row->user_data)) - { - $custom_data = unserialize(trim($row->user_data)); - - if (is_array($custom_data)) - { - $session = $session + $custom_data; - } - } - } - - // Session is valid! - $this->userdata = $session; - return TRUE; - } - - // ------------------------------------------------------------------------ - - /** - * Create a new session - * - * @return void - */ - protected function _sess_create() - { - // Initialize userdata - $this->userdata = array( - 'session_id' => $this->_make_sess_id(), - 'ip_address' => $this->CI->input->ip_address(), - 'user_agent' => trim(substr($this->CI->input->user_agent(), 0, 120)), - 'last_activity' => $this->now, - ); - - log_message('debug', 'Session: Creating new session ('.$this->userdata['session_id'].')'); - - // Check for database - if ($this->sess_use_database === TRUE) - { - // Add empty user_data field and save the data to the DB - $this->CI->db->set('user_data', '')->insert($this->sess_table_name, $this->userdata); - } - - // Write the cookie - $this->_set_cookie(); - } - - // ------------------------------------------------------------------------ - - /** - * Update an existing session - * - * @param bool Force update flag (default: false) - * @return void - */ - protected function _sess_update($force = FALSE) - { - // We only update the session every five minutes by default (unless forced) - if ( ! $force && ($this->userdata['last_activity'] + $this->sess_time_to_update) >= $this->now) - { - return; - } - - // Update last activity to now - $this->userdata['last_activity'] = $this->now; - - // Save the old session id so we know which DB record to update - $old_sessid = $this->userdata['session_id']; - - // Changing the session ID during an AJAX call causes problems - if ( ! $this->CI->input->is_ajax_request()) - { - // Get new id - $this->userdata['session_id'] = $this->_make_sess_id(); - - log_message('debug', 'Session: Regenerate ID'); - } - - // Check for database - if ($this->sess_use_database === TRUE) - { - $this->CI->db->where('session_id', $old_sessid); - - if ($this->sess_match_ip === TRUE) - { - $this->CI->db->where('ip_address', $this->CI->input->ip_address()); - } - - if ($this->sess_match_useragent === TRUE) - { - $this->CI->db->where('user_agent', trim(substr($this->CI->input->user_agent(), 0, 120))); - } - - // Update the session ID and last_activity field in the DB - $this->CI->db->update($this->sess_table_name, - array( - 'last_activity' => $this->now, - 'session_id' => $this->userdata['session_id'] - ) - ); - } - - // Write the cookie - $this->_set_cookie(); - } - - // ------------------------------------------------------------------------ - - /** - * Update database with current data - * - * This gets called from the shutdown function and also - * registered with PHP to run at the end of the request - * so it's guaranteed to update even when a fatal error - * occurs. The first call makes the update and clears the - * dirty flag so it won't happen twice. - * - * @return void - */ - public function _update_db() - { - // Check for database and dirty flag and unsaved - if ($this->sess_use_database === TRUE && $this->data_dirty === TRUE) - { - // Set up activity and data fields to be set - // If we don't find custom data, user_data will remain an empty string - $set = array( - 'last_activity' => $this->userdata['last_activity'], - 'user_data' => '' - ); - - // Get the custom userdata, leaving out the defaults - // (which get stored in the cookie) - $userdata = array_diff_key($this->userdata, $this->defaults); - - // Did we find any custom data? - if ( ! empty($userdata)) - { - // Serialize the custom data array so we can store it - $set['user_data'] = serialize($userdata); - } - - // Reset query builder values. - $this->CI->db->reset_query(); - - // Run the update query - // Any time we change the session id, it gets updated immediately, - // so our where clause below is always safe - $this->CI->db->where('session_id', $this->userdata['session_id']); - - if ($this->sess_match_ip === TRUE) - { - $this->CI->db->where('ip_address', $this->CI->input->ip_address()); - } - - if ($this->sess_match_useragent === TRUE) - { - $this->CI->db->where('user_agent', trim(substr($this->CI->input->user_agent(), 0, 120))); - } - - $this->CI->db->update($this->sess_table_name, $set); - - // Clear dirty flag to prevent double updates - $this->data_dirty = FALSE; - - log_message('debug', 'CI_Session Data Saved To DB'); - } - } - - // ------------------------------------------------------------------------ - - /** - * Generate a new session id - * - * @return string Hashed session id - */ - protected function _make_sess_id() - { - $new_sessid = ''; - do - { - $new_sessid .= mt_rand(); - } - while (strlen($new_sessid) < 32); - - // To make the session ID even more secure we'll combine it with the user's IP - $new_sessid .= $this->CI->input->ip_address(); - - // Turn it into a hash and return - return md5(uniqid($new_sessid, TRUE)); - } - - // ------------------------------------------------------------------------ - - /** - * Get the "now" time - * - * @return int Time - */ - protected function _get_time() - { - if ($this->time_reference === 'local' OR $this->time_reference === date_default_timezone_get()) - { - return time(); - } - - $datetime = new DateTime('now', new DateTimeZone($this->time_reference)); - sscanf($datetime->format('j-n-Y G:i:s'), '%d-%d-%d %d:%d:%d', $day, $month, $year, $hour, $minute, $second); - - return mktime($hour, $minute, $second, $month, $day, $year); - } - - // ------------------------------------------------------------------------ - - /** - * Write the session cookie - * - * @return void - */ - protected function _set_cookie() - { - // Get userdata (only defaults if database) - $cookie_data = ($this->sess_use_database === TRUE) - ? array_intersect_key($this->userdata, $this->defaults) - : $this->userdata; - - // The Input class will do this and since we use HMAC verification, - // unless we standardize here as well, the hash won't match. - if ($this->_standardize_newlines) - { - foreach (array_keys($this->userdata) as $key) - { - $this->userdata[$key] = preg_replace('/(?:\r\n|[\r\n])/', PHP_EOL, $this->userdata[$key]); - } - } - - // Serialize the userdata for the cookie - $cookie_data = serialize($cookie_data); - - if ($this->sess_encrypt_cookie === TRUE) - { - $cookie_data = $this->CI->encryption->encrypt($cookie_data); - } - else - { - // Require message authentication - $cookie_data .= hash_hmac('sha1', $cookie_data, $this->encryption_key); - } - - $expire = ($this->sess_expire_on_close === TRUE) ? 0 : $this->sess_expiration + time(); - - // Set the cookie - $this->_setcookie($this->sess_cookie_name, $cookie_data, $expire, $this->cookie_path, $this->cookie_domain, - $this->cookie_secure, $this->cookie_httponly); - } - - // ------------------------------------------------------------------------ - - /** - * Set a cookie with the system - * - * This abstraction of the setcookie call allows overriding for unit testing - * - * @param string Cookie name - * @param string Cookie value - * @param int Expiration time - * @param string Cookie path - * @param string Cookie domain - * @param bool Secure connection flag - * @param bool HTTP protocol only flag - * @return void - */ - protected function _setcookie($name, $value = '', $expire = 0, $path = '', $domain = '', $secure = FALSE, $httponly = FALSE) - { - setcookie($name, $value, $expire, $path, $domain, $secure, $httponly); - } - - // ------------------------------------------------------------------------ - - /** - * Garbage collection - * - * This deletes expired session rows from database - * if the probability percentage is met - * - * @return void - */ - protected function _sess_gc() - { - if ($this->sess_use_database !== TRUE) - { - return; - } - - $probability = ini_get('session.gc_probability'); - $divisor = ini_get('session.gc_divisor'); - - if (mt_rand(1, $divisor) <= $probability) - { - $expire = $this->now - $this->sess_expiration; - $this->CI->db->delete($this->sess_table_name, 'last_activity < '.$expire); - - log_message('debug', 'Session garbage collection performed.'); - } - } - -} - -/* End of file Session_cookie.php */ -/* Location: ./system/libraries/Session/drivers/Session_cookie.php */
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