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-rw-r--r--system/libraries/Session.php499
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diff --git a/system/libraries/Session.php b/system/libraries/Session.php
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+<?php if (!defined('BASEPATH')) exit('No direct script access allowed');
+/**
+ * Code Igniter
+ *
+ * An open source application development framework for PHP 4.3.2 or newer
+ *
+ * @package CodeIgniter
+ * @author Rick Ellis
+ * @copyright Copyright (c) 2006, pMachine, Inc.
+ * @license http://www.codeignitor.com/user_guide/license.html
+ * @link http://www.codeigniter.com
+ * @since Version 1.0
+ * @filesource
+ */
+
+// ------------------------------------------------------------------------
+
+/**
+ * Session Class
+ *
+ * @package CodeIgniter
+ * @subpackage Libraries
+ * @category Sessions
+ * @author Rick Ellis
+ * @link http://www.codeigniter.com/user_guide/libraries/sessions.html
+ */
+class CI_Session {
+
+ var $now;
+ var $encryption = TRUE;
+ var $use_database = FALSE;
+ var $session_table = FALSE;
+ var $sess_length = 7200;
+ var $sess_cookie = 'ci_session';
+ var $userdata = array();
+ var $gc_probability = 5;
+ var $object;
+
+
+ /**
+ * Session Constructor
+ *
+ * The constructor runs the session routines automatically
+ * whenever the class is instantiated.
+ */
+ function CI_Session()
+ {
+ $this->object =& get_instance();
+
+ log_message('debug', "Session Class Initialized");
+ $this->sess_run();
+ }
+ // END display_errors()
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Run the session routines
+ *
+ * @access public
+ * @return void
+ */
+ function sess_run()
+ {
+ /*
+ * Set the "now" time
+ *
+ * It can either set to GMT or time(). The pref
+ * is set in the config file. If the developer
+ * is doing any sort of time localization they
+ * might want to set the session time to GMT so
+ * they can offset the "last_activity" and
+ * "last_visit" times based on each user's locale.
+ *
+ */
+ if (strtolower($this->object->config->item('time_reference')) == 'gmt')
+ {
+ $now = time();
+ $this->now = mktime(gmdate("H", $now), gmdate("i", $now), gmdate("s", $now), gmdate("m", $now), gmdate("d", $now), gmdate("Y", $now));
+
+ if (strlen($this->now) < 10)
+ {
+ $this->now = time();
+ log_message('error', 'The session class could not set a proper GMT timestamp so the local time() value was used.');
+ }
+ }
+ else
+ {
+ $this->now = time();
+ }
+
+ /*
+ * Set the session length
+ *
+ * If the session expiration is set to zero in
+ * the config file we'll set the expiration
+ * two years from now.
+ *
+ */
+ $expiration = $this->object->config->item('sess_expiration');
+
+ if (ctype_digit($expiration))
+ {
+ if ($expiration > 0)
+ {
+ $this->sess_length = $this->object->config->item('sess_expiration');
+ }
+ else
+ {
+ $this->sess_length = (60*60*24*365*2);
+ }
+ }
+
+ // Do we need encryption?
+ $this->encryption = $this->object->config->item('sess_encrypt_cookie');
+
+ if ($this->encryption == TRUE)
+ {
+ $this->object->load->library('encrypt');
+ }
+
+ // Are we using a database?
+ if ($this->object->config->item('sess_use_database') === TRUE AND $this->object->config->item('sess_table_name') != '')
+ {
+ $this->use_database = TRUE;
+ $this->session_table = $this->object->config->item('sess_table_name');
+ $this->object->load->database();
+ }
+
+ // Set the cookie name
+ if ($this->object->config->item('sess_cookie_name') != FALSE)
+ {
+ $this->sess_cookie = $this->object->config->item('cookie_prefix').$this->object->config->item('sess_cookie_name');
+ }
+
+ /*
+ * Fetch the current session
+ *
+ * If a session doesn't exist we'll create
+ * a new one. If it does, we'll update it.
+ *
+ */
+ if ( ! $this->sess_read())
+ {
+ $this->sess_create();
+ }
+ else
+ {
+ // We only update the session every five minutes
+ if (($this->userdata['last_activity'] + 300) < $this->now)
+ {
+ $this->sess_update();
+ }
+ }
+
+ // Delete expired sessions if necessary
+ if ($this->use_database === TRUE)
+ {
+ $this->sess_gc();
+ }
+ }
+ // END sess_run()
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Fetch the current session data if it exists
+ *
+ * @access public
+ * @return void
+ */
+ function sess_read()
+ {
+ // Fetch the cookie
+ $session = $this->object->input->cookie($this->sess_cookie);
+
+ if ($session === FALSE)
+ {
+ log_message('debug', 'A session cookie was not found.');
+ return FALSE;
+ }
+
+ // Decrypt and unserialize the data
+ if ($this->encryption == TRUE)
+ {
+ $session = $this->object->encrypt->decode($session);
+ }
+
+ $session = @unserialize($this->strip_slashes($session));
+
+ if ( ! is_array($session) OR ! isset($session['last_activity']))
+ {
+ log_message('error', 'The session cookie data did not contain a valid array. This could be a possible hacking attempt.');
+ return FALSE;
+ }
+
+ // Is the session current?
+ if (($session['last_activity'] + $this->sess_length) < $this->now)
+ {
+ $this->sess_destroy();
+ return FALSE;
+ }
+
+ // Does the IP Match?
+ if ($this->object->config->item('sess_match_ip') == TRUE AND $session['ip_address'] != $this->object->input->ip_address())
+ {
+ $this->sess_destroy();
+ return FALSE;
+ }
+
+ // Does the User Agent Match?
+ if ($this->object->config->item('sess_match_useragent') == TRUE AND $session['user_agent'] != substr($this->object->input->user_agent(), 0, 50))
+ {
+ $this->sess_destroy();
+ return FALSE;
+ }
+
+ // Is there a corresponding session in the DB?
+ if ($this->use_database === TRUE)
+ {
+ $this->object->db->where('session_id', $session['session_id']);
+
+ if ($this->object->config->item('sess_match_ip') == TRUE)
+ {
+ $this->object->db->where('ip_address', $session['ip_address']);
+ }
+
+ if ($this->object->config->item('sess_match_useragent') == TRUE)
+ {
+ $this->object->db->where('user_agent', $session['user_agent']);
+ }
+
+ $query = $this->object->db->get($this->session_table);
+
+ if ($query->num_rows() == 0)
+ {
+ $this->sess_destroy();
+ return FALSE;
+ }
+ else
+ {
+ $row = $query->row();
+ if (($row->last_activity + $this->sess_length) < $this->now)
+ {
+ $this->object->db->where('session_id', $session['session_id']);
+ $this->object->db->delete($this->session_table);
+ $this->sess_destroy();
+ return FALSE;
+ }
+ }
+ }
+
+ // Session is valid!
+ $this->userdata = $session;
+ unset($session);
+
+ return TRUE;
+ }
+ // END sess_read()
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Write the session cookie
+ *
+ * @access public
+ * @return void
+ */
+ function sess_write()
+ {
+ $cookie_data = serialize($this->userdata);
+
+ if ($this->encryption == TRUE)
+ {
+ $cookie_data = $this->object->encrypt->encode($cookie_data);
+ }
+
+ setcookie(
+ $this->sess_cookie,
+ $cookie_data,
+ $this->sess_length + $this->now,
+ $this->object->config->item('cookie_path'),
+ $this->object->config->item('cookie_domain'),
+ 0
+ );
+ }
+ // END sess_read()
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Create a new session
+ *
+ * @access public
+ * @return void
+ */
+ function sess_create()
+ {
+ $sessid = '';
+ while (strlen($sessid) < 32)
+ {
+ $sessid .= mt_rand(0, mt_getrandmax());
+ }
+
+ $this->userdata = array(
+ 'session_id' => md5(uniqid($sessid, TRUE)),
+ 'ip_address' => $this->object->input->ip_address(),
+ 'user_agent' => substr($this->object->input->user_agent(), 0, 50),
+ 'last_activity' => $this->now
+ );
+
+
+ // Save the session in the DB if needed
+ if ($this->use_database === TRUE)
+ {
+ $this->object->db->query($this->object->db->insert_string($this->session_table, $this->userdata));
+ }
+
+ // Write the cookie
+ $this->userdata['last_visit'] = 0;
+ $this->sess_write();
+ }
+ // END sess_read()
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Update an existing session
+ *
+ * @access public
+ * @return void
+ */
+ function sess_update()
+ {
+ if (($this->userdata['last_activity'] + $this->sess_length) < $this->now)
+ {
+ $this->userdata['last_visit'] = $this->userdata['last_activity'];
+ }
+
+ $this->userdata['last_activity'] = $this->now;
+
+ // Update the session in the DB if needed
+ if ($this->use_database === TRUE)
+ {
+ $this->object->db->query($this->object->db->update_string($this->session_table, array('last_activity' => $this->now), array('session_id' => $this->userdata['session_id'])));
+ }
+
+ // Write the cookie
+ $this->sess_write();
+ }
+ // END sess_update()
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Destroy the current session
+ *
+ * @access public
+ * @return void
+ */
+ function sess_destroy()
+ {
+ setcookie(
+ $this->sess_cookie,
+ addslashes(serialize(array())),
+ ($this->now - 31500000),
+ $this->object->config->item('cookie_path'),
+ $this->object->config->item('cookie_domain'),
+ 0
+ );
+ }
+ // END sess_destroy()
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Garbage collection
+ *
+ * This deletes expired session rows from database
+ * if the probability percentage is met
+ *
+ * @access public
+ * @return void
+ */
+ function sess_gc()
+ {
+ srand(time());
+ if ((rand() % 100) < $this->gc_probability)
+ {
+ $expire = $this->now - $this->sess_length;
+
+ $this->object->db->where("last_activity < {$expire}");
+ $this->object->db->delete($this->session_table);
+
+ log_message('debug', 'Session garbage collection performed.');
+ }
+ }
+ // END sess_destroy()
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Fetch a specific item form the session array
+ *
+ * @access public
+ * @param string
+ * @return string
+ */
+ function userdata($item)
+ {
+ return ( ! isset($this->userdata[$item])) ? FALSE : $this->userdata[$item];
+ }
+ // END sess_destroy()
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Add or change data in the "userdata" array
+ *
+ * @access public
+ * @param mixed
+ * @param string
+ * @return void
+ */
+ function set_userdata($newdata = array(), $newval = '')
+ {
+ if (is_string($newdata))
+ {
+ $newdata = array($newdata => $newval);
+ }
+
+ if (count($newdata) > 0)
+ {
+ foreach ($newdata as $key => $val)
+ {
+ $this->userdata[$key] = $val;
+ }
+ }
+
+ $this->sess_write();
+ }
+ // END set_userdata()
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Delete a session variable from the "userdata" array
+ *
+ * @access array
+ * @return void
+ */
+ function unset_userdata($newdata = array())
+ {
+ if (is_string($newdata))
+ {
+ $newdata = array($newdata => '');
+ }
+
+ if (count($newdata) > 0)
+ {
+ foreach ($newdata as $key => $val)
+ {
+ unset($this->userdata[$key]);
+ }
+ }
+
+ $this->sess_write();
+ }
+ // END set_userdata()
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Strip slashes
+ *
+ * @access public
+ * @param mixed
+ * @return mixed
+ */
+ function strip_slashes($vals)
+ {
+ if (is_array($vals))
+ {
+ foreach ($vals as $key=>$val)
+ {
+ $vals[$key] = $this->strip_slashes($val);
+ }
+ }
+ else
+ {
+ $vals = stripslashes($vals);
+ }
+
+ return $vals;
+ }
+ // END strip_slashes()
+}
+// END Session Class
+?> \ No newline at end of file
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