mirror of
https://github.com/claudehohl/Stikked.git
synced 2025-04-29 15:01:08 -05:00
654 lines
16 KiB
PHP
654 lines
16 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 4.3.2 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) 2006, 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 $CI;
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var $now;
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var $encryption = TRUE;
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var $use_database = FALSE;
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var $session_table = FALSE;
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var $sess_length = 7200;
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var $sess_cookie = 'ci_session';
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var $userdata = array();
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var $gc_probability = 5;
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var $flashdata_key = 'flash';
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var $time_to_update = 300;
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/**
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* Session Constructor
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*
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* The constructor runs the session routines automatically
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* whenever the class is instantiated.
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*/
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function CI_Session()
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{
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$this->CI =& get_instance();
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log_message('debug', "Session Class Initialized");
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$this->sess_run();
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}
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// --------------------------------------------------------------------
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/**
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* Run the session routines
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*
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* @access public
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* @return void
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*/
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function sess_run()
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{
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/*
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* Set the "now" time
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*
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* It can either set to GMT or time(). The pref
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* is set in the config file. If the developer
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* is doing any sort of time localization they
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* might want to set the session time to GMT so
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* they can offset the "last_activity" time
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* based on each user's locale.
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*
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*/
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if (is_numeric($this->CI->config->item('sess_time_to_update')))
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{
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$this->time_to_update = $this->CI->config->item('sess_time_to_update');
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}
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if (strtolower($this->CI->config->item('time_reference')) == 'gmt')
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{
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$now = time();
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$this->now = mktime(gmdate("H", $now), gmdate("i", $now), gmdate("s", $now), gmdate("m", $now), gmdate("d", $now), gmdate("Y", $now));
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if (strlen($this->now) < 10)
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{
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$this->now = time();
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log_message('error', 'The session class could not set a proper GMT timestamp so the local time() value was used.');
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}
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}
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else
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{
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$this->now = time();
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}
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/*
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* Set the session length
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*
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* If the session expiration is set to zero in
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* the config file we'll set the expiration
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* two years from now.
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*
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*/
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$expiration = $this->CI->config->item('sess_expiration');
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if (is_numeric($expiration))
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{
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if ($expiration > 0)
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{
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$this->sess_length = $this->CI->config->item('sess_expiration');
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}
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else
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{
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$this->sess_length = (60*60*24*365*2);
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}
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}
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// Do we need encryption?
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$this->encryption = $this->CI->config->item('sess_encrypt_cookie');
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if ($this->encryption == TRUE)
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{
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$this->CI->load->library('encrypt');
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}
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// Are we using a database?
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if ($this->CI->config->item('sess_use_database') === TRUE AND $this->CI->config->item('sess_table_name') != '')
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{
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$this->use_database = TRUE;
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$this->session_table = $this->CI->config->item('sess_table_name');
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$this->CI->load->database();
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}
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// Set the cookie name
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if ($this->CI->config->item('sess_cookie_name') != FALSE)
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{
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$this->sess_cookie = $this->CI->config->item('cookie_prefix').$this->CI->config->item('sess_cookie_name');
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}
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/*
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* Fetch the current session
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*
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* If a session doesn't exist we'll create
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* a new one. If it does, we'll update it.
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*
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*/
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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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// We only update the session every five minutes
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if (($this->userdata['last_activity'] + $this->time_to_update) < $this->now)
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{
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$this->sess_update();
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}
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}
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// Delete expired sessions if necessary
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if ($this->use_database === TRUE)
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{
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$this->sess_gc();
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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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}
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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 void
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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);
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if ($session === FALSE)
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{
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log_message('debug', 'A session cookie was not found.');
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return FALSE;
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}
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// Decrypt and unserialize the data
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if ($this->encryption == 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
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// in userspace
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if ($hash !== md5($session.$this->CI->config->item('encryption_key')))
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{
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log_message('error', 'The session cookie data did not match what was expected. This could be a possible hacking attempt.');
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$this->sess_destroy();
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return FALSE;
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}
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}
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$session = @unserialize($this->strip_slashes($session));
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if ( ! is_array($session) OR ! isset($session['last_activity']))
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{
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log_message('error', 'The session cookie data did not contain a valid array. This could be a possible hacking attempt.');
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return FALSE;
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}
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// Is the session current?
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if (($session['last_activity'] + $this->sess_length) < $this->now)
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{
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$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->CI->config->item('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 ($this->CI->config->item('sess_match_useragent') == TRUE AND trim($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 ($this->use_database === TRUE)
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{
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$this->CI->db->where('session_id', $session['session_id']);
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if ($this->CI->config->item('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->CI->config->item('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->session_table);
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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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else
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{
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$row = $query->row();
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if (($row->last_activity + $this->sess_length) < $this->now)
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{
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$this->CI->db->where('session_id', $session['session_id']);
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$this->CI->db->delete($this->session_table);
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$this->sess_destroy();
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return FALSE;
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}
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}
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}
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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 cookie
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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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$cookie_data = serialize($this->userdata);
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if ($this->encryption == TRUE)
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{
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$cookie_data = $this->CI->encrypt->encode($cookie_data);
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}
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else
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{
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// if encryption is not used, we provide an md5 hash to prevent userside tampering
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$cookie_data = $cookie_data . md5($cookie_data.$this->CI->config->item('encryption_key'));
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}
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setcookie(
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$this->sess_cookie,
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$cookie_data,
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$this->sess_length + time(),
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$this->CI->config->item('cookie_path'),
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$this->CI->config->item('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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* 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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$sessid .= mt_rand(0, mt_getrandmax());
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}
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$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' => $this->now
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);
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// Save the session in the DB if needed
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if ($this->use_database === TRUE)
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{
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$this->CI->db->query($this->CI->db->insert_string($this->session_table, $this->userdata));
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}
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// Write the cookie
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$this->sess_write();
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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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// 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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$new_sessid = md5(uniqid($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'] = $this->now;
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// Update the session in the DB if needed
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if ($this->use_database === TRUE)
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{
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$this->CI->db->query($this->CI->db->update_string($this->session_table, 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->sess_write();
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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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setcookie(
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$this->sess_cookie,
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addslashes(serialize(array())),
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($this->now - 31500000),
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$this->CI->config->item('cookie_path'),
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$this->CI->config->item('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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* Garbage collection
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*
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* This deletes expired session rows from database
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* if the probability percentage is met
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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_gc()
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{
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srand(time());
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if ((rand() % 100) < $this->gc_probability)
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{
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$expire = $this->now - $this->sess_length;
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$this->CI->db->where("last_activity < {$expire}");
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$this->CI->db->delete($this->session_table);
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log_message('debug', 'Session garbage collection performed.');
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}
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}
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// --------------------------------------------------------------------
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/**
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* Fetch a specific item from the session array
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*
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* @access public
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* @param string
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* @return string
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*/
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function userdata($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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* Strip slashes
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*
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* @access public
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* @param mixed
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* @return mixed
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*/
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function strip_slashes($vals)
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{
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if (is_array($vals))
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{
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foreach ($vals as $key=>$val)
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{
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$vals[$key] = $this->strip_slashes($val);
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}
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}
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else
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{
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$vals = stripslashes($vals);
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}
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return $vals;
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}
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// ------------------------------------------------------------------------
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/**
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* Add or change flashdata, only available
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* until the next request
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*
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* @access public
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* @param mixed
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* @param string
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* @return void
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*/
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function set_flashdata($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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|
{
|
|
$flashdata_key = $this->flashdata_key.':old:'.$key;
|
|
return $this->userdata($flashdata_key);
|
|
}
|
|
|
|
// ------------------------------------------------------------------------
|
|
|
|
/**
|
|
* 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);
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
// END Session Class
|
|
|
|
/* End of file Session.php */
|
|
/* Location: ./system/libraries/Session.php */ |