776 行
无行尾
19 KiB
PHP
776 行
无行尾
19 KiB
PHP
<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
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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 5.1.6 or newer
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*
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* @package CodeIgniter
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* @author ExpressionEngine Dev Team
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* @copyright Copyright (c) 2008 - 2011, EllisLab, Inc.
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* @license http://codeigniter.com/user_guide/license.html
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* @link http://codeigniter.com
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* @since Version 1.0
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* @filesource
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*/
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// ------------------------------------------------------------------------
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/**
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* Session Class
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*
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* @package CodeIgniter
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* @subpackage Libraries
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* @category Sessions
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* @author ExpressionEngine Dev Team
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* @link http://codeigniter.com/user_guide/libraries/sessions.html
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*/
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class CI_Session {
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var $sess_encrypt_cookie = FALSE;
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var $sess_use_database = FALSE;
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var $sess_table_name = '';
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var $sess_expiration = 7200;
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var $sess_expire_on_close = FALSE;
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var $sess_match_ip = FALSE;
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var $sess_match_useragent = TRUE;
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var $sess_cookie_name = 'ci_session';
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var $cookie_prefix = '';
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var $cookie_path = '';
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var $cookie_domain = '';
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var $cookie_secure = FALSE;
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var $sess_time_to_update = 300;
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var $encryption_key = '';
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var $flashdata_key = 'flash';
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var $time_reference = 'time';
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var $gc_probability = 5;
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var $userdata = array();
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var $CI;
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var $now;
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/**
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* Session Constructor
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*
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* The constructor runs the session routines automatically
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* whenever the class is instantiated.
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*/
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public function __construct($params = array())
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{
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log_message('debug', "Session Class Initialized");
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// Set the super object to a local variable for use throughout the class
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$this->CI =& get_instance();
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// Set all the session preferences, which can either be set
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// manually via the $params array above or via the config file
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foreach (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', 'sess_time_to_update', 'time_reference', 'cookie_prefix', 'encryption_key') as $key)
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{
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$this->$key = (isset($params[$key])) ? $params[$key] : $this->CI->config->item($key);
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}
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if ($this->encryption_key == '')
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{
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show_error('In order to use the Session class you are required to set an encryption key in your config file.');
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}
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// Load the string helper so we can use the strip_slashes() function
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$this->CI->load->helper('string');
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// Do we need encryption? If so, load the encryption class
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if ($this->sess_encrypt_cookie == TRUE)
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{
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$this->CI->load->library('encrypt');
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}
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// Are we using a database? If so, load it
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if ($this->sess_use_database === TRUE AND $this->sess_table_name != '')
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{
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$this->CI->load->database();
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}
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// Set the "now" time. Can either be GMT or server time, based on the
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// config prefs. We use this to set the "last activity" time
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$this->now = $this->_get_time();
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// Set the session length. If the session expiration is
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// set to zero we'll set the expiration two years from now.
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if ($this->sess_expiration == 0)
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{
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$this->sess_expiration = (60*60*24*365*2);
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}
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// Set the cookie name
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$this->sess_cookie_name = $this->cookie_prefix.$this->sess_cookie_name;
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// Run the Session routine. If a session doesn't exist we'll
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// create a new one. If it does, we'll update it.
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if ( ! $this->sess_read())
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{
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$this->sess_create();
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}
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else
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{
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$this->sess_update();
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}
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// Delete 'old' flashdata (from last request)
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$this->_flashdata_sweep();
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// Mark all new flashdata as old (data will be deleted before next request)
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$this->_flashdata_mark();
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// Delete expired sessions if necessary
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$this->_sess_gc();
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log_message('debug', "Session routines successfully run");
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}
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// --------------------------------------------------------------------
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/**
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* Fetch the current session data if it exists
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*
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* @access public
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* @return bool
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*/
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function sess_read()
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{
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// Fetch the cookie
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$session = $this->CI->input->cookie($this->sess_cookie_name);
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// No cookie? Goodbye cruel world!...
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if ($session === FALSE)
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{
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log_message('debug', 'A session cookie was not found.');
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return FALSE;
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}
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// Decrypt the cookie data
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if ($this->sess_encrypt_cookie == TRUE)
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{
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$session = $this->CI->encrypt->decode($session);
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}
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else
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{
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// encryption was not used, so we need to check the md5 hash
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$hash = substr($session, strlen($session)-32); // get last 32 chars
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$session = substr($session, 0, strlen($session)-32);
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// Does the md5 hash match? This is to prevent manipulation of session data in userspace
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if ($hash !== md5($session.$this->encryption_key))
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{
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log_message('error', 'The session cookie data did not match what was expected. This could be a possible hacking attempt.');
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$this->sess_destroy();
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return FALSE;
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}
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}
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// Unserialize the session array
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$session = $this->_unserialize($session);
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// Is the session data we unserialized an array with the correct format?
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if ( ! is_array($session) OR ! isset($session['session_id']) OR ! isset($session['ip_address']) OR ! isset($session['user_agent']) OR ! isset($session['last_activity']))
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{
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$this->sess_destroy();
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return FALSE;
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}
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// Is the session current?
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if (($session['last_activity'] + $this->sess_expiration) < $this->now)
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{
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$this->sess_destroy();
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return FALSE;
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}
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// Does the IP Match?
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if ($this->sess_match_ip == TRUE AND $session['ip_address'] != $this->CI->input->ip_address())
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{
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$this->sess_destroy();
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return FALSE;
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}
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// Does the User Agent Match?
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if ($this->sess_match_useragent == TRUE AND trim($session['user_agent']) != trim(substr($this->CI->input->user_agent(), 0, 50)))
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{
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$this->sess_destroy();
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return FALSE;
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}
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// Is there a corresponding session in the DB?
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if ($this->sess_use_database === TRUE)
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{
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$this->CI->db->where('session_id', $session['session_id']);
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if ($this->sess_match_ip == TRUE)
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{
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$this->CI->db->where('ip_address', $session['ip_address']);
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}
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if ($this->sess_match_useragent == TRUE)
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{
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$this->CI->db->where('user_agent', $session['user_agent']);
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}
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$query = $this->CI->db->get($this->sess_table_name);
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// No result? Kill it!
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if ($query->num_rows() == 0)
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{
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$this->sess_destroy();
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return FALSE;
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}
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// Is there custom data? If so, add it to the main session array
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$row = $query->row();
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if (isset($row->user_data) AND $row->user_data != '')
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{
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$custom_data = $this->_unserialize($row->user_data);
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if (is_array($custom_data))
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{
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foreach ($custom_data as $key => $val)
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{
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$session[$key] = $val;
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}
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}
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}
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}
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// Session is valid!
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$this->userdata = $session;
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unset($session);
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return TRUE;
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}
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// --------------------------------------------------------------------
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/**
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* Write the session data
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*
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* @access public
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* @return void
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*/
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function sess_write()
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{
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// Are we saving custom data to the DB? If not, all we do is update the cookie
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if ($this->sess_use_database === FALSE)
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{
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$this->_set_cookie();
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return;
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}
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// set the custom userdata, the session data we will set in a second
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$custom_userdata = $this->userdata;
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$cookie_userdata = array();
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// Before continuing, we need to determine if there is any custom data to deal with.
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// Let's determine this by removing the default indexes to see if there's anything left in the array
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// and set the session data while we're at it
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foreach (array('session_id','ip_address','user_agent','last_activity') as $val)
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{
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unset($custom_userdata[$val]);
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$cookie_userdata[$val] = $this->userdata[$val];
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}
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// Did we find any custom data? If not, we turn the empty array into a string
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// since there's no reason to serialize and store an empty array in the DB
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if (count($custom_userdata) === 0)
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{
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$custom_userdata = '';
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}
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else
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{
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// Serialize the custom data array so we can store it
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$custom_userdata = $this->_serialize($custom_userdata);
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}
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// Run the update query
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$this->CI->db->where('session_id', $this->userdata['session_id']);
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$this->CI->db->update($this->sess_table_name, array('last_activity' => $this->userdata['last_activity'], 'user_data' => $custom_userdata));
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// Write the cookie. Notice that we manually pass the cookie data array to the
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// _set_cookie() function. Normally that function will store $this->userdata, but
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// in this case that array contains custom data, which we do not want in the cookie.
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$this->_set_cookie($cookie_userdata);
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}
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// --------------------------------------------------------------------
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/**
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* Create a new session
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*
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* @access public
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* @return void
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*/
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function sess_create()
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{
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$sessid = '';
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while (strlen($sessid) < 32)
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{
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$sessid .= mt_rand(0, mt_getrandmax());
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}
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// To make the session ID even more secure we'll combine it with the user's IP
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$sessid .= $this->CI->input->ip_address();
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$this->userdata = array(
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'session_id' => md5(uniqid($sessid, TRUE)),
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'ip_address' => $this->CI->input->ip_address(),
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'user_agent' => substr($this->CI->input->user_agent(), 0, 50),
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'last_activity' => $this->now
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);
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// Save the data to the DB if needed
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if ($this->sess_use_database === TRUE)
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{
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$this->CI->db->query($this->CI->db->insert_string($this->sess_table_name, $this->userdata));
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}
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// Write the cookie
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$this->_set_cookie();
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}
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// --------------------------------------------------------------------
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/**
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* Update an existing session
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*
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* @access public
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* @return void
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*/
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function sess_update()
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{
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// We only update the session every five minutes by default
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if (($this->userdata['last_activity'] + $this->sess_time_to_update) >= $this->now)
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{
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return;
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}
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// Save the old session id so we know which record to
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// update in the database if we need it
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$old_sessid = $this->userdata['session_id'];
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$new_sessid = '';
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while (strlen($new_sessid) < 32)
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{
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$new_sessid .= mt_rand(0, mt_getrandmax());
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}
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// To make the session ID even more secure we'll combine it with the user's IP
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$new_sessid .= $this->CI->input->ip_address();
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// Turn it into a hash
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$new_sessid = md5(uniqid($new_sessid, TRUE));
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// Update the session data in the session data array
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$this->userdata['session_id'] = $new_sessid;
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$this->userdata['last_activity'] = $this->now;
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// _set_cookie() will handle this for us if we aren't using database sessions
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// by pushing all userdata to the cookie.
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$cookie_data = NULL;
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// Update the session ID and last_activity field in the DB if needed
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if ($this->sess_use_database === TRUE)
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{
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// set cookie explicitly to only have our session data
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$cookie_data = array();
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foreach (array('session_id','ip_address','user_agent','last_activity') as $val)
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{
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$cookie_data[$val] = $this->userdata[$val];
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}
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$this->CI->db->query($this->CI->db->update_string($this->sess_table_name, array('last_activity' => $this->now, 'session_id' => $new_sessid), array('session_id' => $old_sessid)));
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}
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// Write the cookie
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$this->_set_cookie($cookie_data);
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}
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// --------------------------------------------------------------------
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/**
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* Destroy the current session
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*
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* @access public
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* @return void
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*/
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function sess_destroy()
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{
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// Kill the session DB row
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if ($this->sess_use_database === TRUE AND isset($this->userdata['session_id']))
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{
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$this->CI->db->where('session_id', $this->userdata['session_id']);
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$this->CI->db->delete($this->sess_table_name);
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}
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// Kill the cookie
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setcookie(
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$this->sess_cookie_name,
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addslashes(serialize(array())),
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($this->now - 31500000),
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$this->cookie_path,
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$this->cookie_domain,
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0
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);
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}
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// --------------------------------------------------------------------
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/**
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* Fetch a specific item from the session array
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*
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* @access public
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* @param string
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* @return string
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*/
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function userdata($item)
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{
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return ( ! isset($this->userdata[$item])) ? FALSE : $this->userdata[$item];
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}
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// --------------------------------------------------------------------
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/**
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* Fetch all session data
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*
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* @access public
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* @return mixed
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*/
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function all_userdata()
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{
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return ( ! isset($this->userdata)) ? FALSE : $this->userdata;
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}
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// --------------------------------------------------------------------
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/**
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* Add or change data in the "userdata" array
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*
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* @access public
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* @param mixed
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* @param string
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* @return void
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*/
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function set_userdata($newdata = array(), $newval = '')
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{
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if (is_string($newdata))
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{
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$newdata = array($newdata => $newval);
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}
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if (count($newdata) > 0)
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{
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foreach ($newdata as $key => $val)
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{
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$this->userdata[$key] = $val;
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}
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}
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$this->sess_write();
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}
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// --------------------------------------------------------------------
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/**
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* Delete a session variable from the "userdata" array
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*
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* @access array
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* @return void
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*/
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function unset_userdata($newdata = array())
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{
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if (is_string($newdata))
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{
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$newdata = array($newdata => '');
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}
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if (count($newdata) > 0)
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{
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foreach ($newdata as $key => $val)
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{
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unset($this->userdata[$key]);
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}
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}
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$this->sess_write();
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}
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// ------------------------------------------------------------------------
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/**
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* Add or change flashdata, only available
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* until the next request
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*
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* @access public
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* @param mixed
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* @param string
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* @return void
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*/
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function set_flashdata($newdata = array(), $newval = '')
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{
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if (is_string($newdata))
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{
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$newdata = array($newdata => $newval);
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}
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if (count($newdata) > 0)
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{
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foreach ($newdata as $key => $val)
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{
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$flashdata_key = $this->flashdata_key.':new:'.$key;
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$this->set_userdata($flashdata_key, $val);
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}
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}
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}
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// ------------------------------------------------------------------------
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/**
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* Keeps existing flashdata available to next request.
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*
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* @access public
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* @param string
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* @return void
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*/
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function keep_flashdata($key)
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{
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// 'old' flashdata gets removed. Here we mark all
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// flashdata as 'new' to preserve it from _flashdata_sweep()
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// Note the function will return FALSE if the $key
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// provided cannot be found
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$old_flashdata_key = $this->flashdata_key.':old:'.$key;
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$value = $this->userdata($old_flashdata_key);
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$new_flashdata_key = $this->flashdata_key.':new:'.$key;
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$this->set_userdata($new_flashdata_key, $value);
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}
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// ------------------------------------------------------------------------
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/**
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* Fetch a specific flashdata item from the session array
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*
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* @access public
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* @param string
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* @return string
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*/
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function flashdata($key)
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{
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$flashdata_key = $this->flashdata_key.':old:'.$key;
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return $this->userdata($flashdata_key);
|
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}
|
|
|
|
// ------------------------------------------------------------------------
|
|
|
|
/**
|
|
* Identifies flashdata as 'old' for removal
|
|
* when _flashdata_sweep() runs.
|
|
*
|
|
* @access private
|
|
* @return void
|
|
*/
|
|
function _flashdata_mark()
|
|
{
|
|
$userdata = $this->all_userdata();
|
|
foreach ($userdata as $name => $value)
|
|
{
|
|
$parts = explode(':new:', $name);
|
|
if (is_array($parts) && count($parts) === 2)
|
|
{
|
|
$new_name = $this->flashdata_key.':old:'.$parts[1];
|
|
$this->set_userdata($new_name, $value);
|
|
$this->unset_userdata($name);
|
|
}
|
|
}
|
|
}
|
|
|
|
// ------------------------------------------------------------------------
|
|
|
|
/**
|
|
* Removes all flashdata marked as 'old'
|
|
*
|
|
* @access private
|
|
* @return void
|
|
*/
|
|
|
|
function _flashdata_sweep()
|
|
{
|
|
$userdata = $this->all_userdata();
|
|
foreach ($userdata as $key => $value)
|
|
{
|
|
if (strpos($key, ':old:'))
|
|
{
|
|
$this->unset_userdata($key);
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* Get the "now" time
|
|
*
|
|
* @access private
|
|
* @return string
|
|
*/
|
|
function _get_time()
|
|
{
|
|
if (strtolower($this->time_reference) == 'gmt')
|
|
{
|
|
$now = time();
|
|
$time = mktime(gmdate("H", $now), gmdate("i", $now), gmdate("s", $now), gmdate("m", $now), gmdate("d", $now), gmdate("Y", $now));
|
|
}
|
|
else
|
|
{
|
|
$time = time();
|
|
}
|
|
|
|
return $time;
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* Write the session cookie
|
|
*
|
|
* @access public
|
|
* @return void
|
|
*/
|
|
function _set_cookie($cookie_data = NULL)
|
|
{
|
|
if (is_null($cookie_data))
|
|
{
|
|
$cookie_data = $this->userdata;
|
|
}
|
|
|
|
// Serialize the userdata for the cookie
|
|
$cookie_data = $this->_serialize($cookie_data);
|
|
|
|
if ($this->sess_encrypt_cookie == TRUE)
|
|
{
|
|
$cookie_data = $this->CI->encrypt->encode($cookie_data);
|
|
}
|
|
else
|
|
{
|
|
// if encryption is not used, we provide an md5 hash to prevent userside tampering
|
|
$cookie_data = $cookie_data.md5($cookie_data.$this->encryption_key);
|
|
}
|
|
|
|
$expire = ($this->sess_expire_on_close === TRUE) ? 0 : $this->sess_expiration + time();
|
|
|
|
// Set the cookie
|
|
setcookie(
|
|
$this->sess_cookie_name,
|
|
$cookie_data,
|
|
$expire,
|
|
$this->cookie_path,
|
|
$this->cookie_domain,
|
|
$this->cookie_secure
|
|
);
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* Serialize an array
|
|
*
|
|
* This function first converts any slashes found in the array to a temporary
|
|
* marker, so when it gets unserialized the slashes will be preserved
|
|
*
|
|
* @access private
|
|
* @param array
|
|
* @return string
|
|
*/
|
|
function _serialize($data)
|
|
{
|
|
if (is_array($data))
|
|
{
|
|
foreach ($data as $key => $val)
|
|
{
|
|
if (is_string($val))
|
|
{
|
|
$data[$key] = str_replace('\\', '{{slash}}', $val);
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (is_string($data))
|
|
{
|
|
$data = str_replace('\\', '{{slash}}', $data);
|
|
}
|
|
}
|
|
|
|
return serialize($data);
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* Unserialize
|
|
*
|
|
* This function unserializes a data string, then converts any
|
|
* temporary slash markers back to actual slashes
|
|
*
|
|
* @access private
|
|
* @param array
|
|
* @return string
|
|
*/
|
|
function _unserialize($data)
|
|
{
|
|
$data = @unserialize(strip_slashes($data));
|
|
|
|
if (is_array($data))
|
|
{
|
|
foreach ($data as $key => $val)
|
|
{
|
|
if (is_string($val))
|
|
{
|
|
$data[$key] = str_replace('{{slash}}', '\\', $val);
|
|
}
|
|
}
|
|
|
|
return $data;
|
|
}
|
|
|
|
return (is_string($data)) ? str_replace('{{slash}}', '\\', $data) : $data;
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* Garbage collection
|
|
*
|
|
* This deletes expired session rows from database
|
|
* if the probability percentage is met
|
|
*
|
|
* @access public
|
|
* @return void
|
|
*/
|
|
function _sess_gc()
|
|
{
|
|
if ($this->sess_use_database != TRUE)
|
|
{
|
|
return;
|
|
}
|
|
|
|
srand(time());
|
|
if ((rand() % 100) < $this->gc_probability)
|
|
{
|
|
$expire = $this->now - $this->sess_expiration;
|
|
|
|
$this->CI->db->where("last_activity < {$expire}");
|
|
$this->CI->db->delete($this->sess_table_name);
|
|
|
|
log_message('debug', 'Session garbage collection performed.');
|
|
}
|
|
}
|
|
|
|
|
|
}
|
|
// END Session Class
|
|
|
|
/* End of file Session.php */
|
|
/* Location: ./system/libraries/Session.php */ |