-<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');\r
-/**\r
- * CodeIgniter\r
- *\r
- * An open source application development framework for PHP 4.3.2 or newer\r
- *\r
- * @package CodeIgniter\r
- * @author ExpressionEngine Dev Team\r
- * @copyright Copyright (c) 2008, EllisLab, Inc.\r
- * @license http://codeigniter.com/user_guide/license.html\r
- * @link http://codeigniter.com\r
- * @since Version 1.0\r
- * @filesource\r
- */\r
-\r
-// ------------------------------------------------------------------------\r
-\r
-/**\r
- * Session Class\r
- *\r
- * @package CodeIgniter\r
- * @subpackage Libraries\r
- * @category Sessions\r
- * @author ExpressionEngine Dev Team\r
- * @link http://codeigniter.com/user_guide/libraries/sessions.html\r
- */\r
-class CI_Session {\r
-\r
- var $sess_encrypt_cookie = FALSE;\r
- var $sess_use_database = FALSE;\r
- var $sess_table_name = '';\r
- var $sess_expiration = 7200;\r
- var $sess_match_ip = FALSE;\r
- var $sess_match_useragent = TRUE;\r
- var $sess_cookie_name = 'ci_session';\r
- var $cookie_prefix = '';\r
- var $cookie_path = '';\r
- var $cookie_domain = '';\r
- var $sess_time_to_update = 300;\r
- var $encryption_key = '';\r
- var $flashdata_key = 'flash';\r
- var $time_reference = 'time';\r
- var $gc_probability = 5;\r
- var $userdata = array();\r
- var $CI;\r
- var $now;\r
-\r
- /**\r
- * Session Constructor\r
- *\r
- * The constructor runs the session routines automatically\r
- * whenever the class is instantiated.\r
- */ \r
- function CI_Session($params = array())\r
- {\r
- log_message('debug', "Session Class Initialized");\r
-\r
- // Set the super object to a local variable for use throughout the class\r
- $this->CI =& get_instance();\r
- \r
- // Set all the session preferences, which can either be set \r
- // manually via the $params array above or via the config file\r
- foreach (array('sess_encrypt_cookie', 'sess_use_database', 'sess_table_name', 'sess_expiration', 'sess_match_ip', 'sess_match_useragent', 'sess_cookie_name', 'cookie_path', 'cookie_domain', 'sess_time_to_update', 'time_reference', 'cookie_prefix', 'encryption_key') as $key)\r
- {\r
- $this->$key = (isset($params[$key])) ? $params[$key] : $this->CI->config->item($key);\r
- } \r
- \r
- // Load the string helper so we can use the strip_slashes() function\r
- $this->CI->load->helper('string');\r
-\r
- // Do we need encryption? If so, load the encryption class\r
- if ($this->sess_encrypt_cookie == TRUE)\r
- {\r
- $this->CI->load->library('encrypt');\r
- }\r
-\r
- // Are we using a database? If so, load it\r
- if ($this->sess_use_database === TRUE AND $this->sess_table_name != '')\r
- {\r
- $this->CI->load->database();\r
- }\r
-\r
- // Set the "now" time. Can either be GMT or server time, based on the\r
- // config prefs. We use this to set the "last activity" time\r
- $this->now = $this->_get_time();\r
-\r
- // Set the session length. If the session expiration is\r
- // set to zero we'll set the expiration two years from now.\r
- if ($this->sess_expiration == 0)\r
- {\r
- $this->sess_expiration = (60*60*24*365*2);\r
- }\r
- \r
- // Set the cookie name\r
- $this->sess_cookie_name = $this->cookie_prefix.$this->sess_cookie_name;\r
- \r
- // Run the Session routine. If a session doesn't exist we'll \r
- // create a new one. If it does, we'll update it.\r
- if ( ! $this->sess_read())\r
- {\r
- $this->sess_create();\r
- }\r
- else\r
- { \r
- $this->sess_update();\r
- }\r
- \r
- // Delete 'old' flashdata (from last request)\r
- $this->_flashdata_sweep();\r
- \r
- // Mark all new flashdata as old (data will be deleted before next request)\r
- $this->_flashdata_mark();\r
-\r
- // Delete expired sessions if necessary\r
- $this->_sess_gc();\r
-\r
- log_message('debug', "Session routines successfully run");\r
- }\r
- \r
- // --------------------------------------------------------------------\r
- \r
- /**\r
- * Fetch the current session data if it exists\r
- *\r
- * @access public\r
- * @return void\r
- */\r
- function sess_read()\r
- { \r
- // Fetch the cookie\r
- $session = $this->CI->input->cookie($this->sess_cookie_name);\r
- \r
- // No cookie? Goodbye cruel world!...\r
- if ($session === FALSE)\r
- {\r
- log_message('debug', 'A session cookie was not found.');\r
- return FALSE;\r
- }\r
- \r
- // Decrypt the cookie data\r
- if ($this->sess_encrypt_cookie == TRUE)\r
- {\r
- $session = $this->CI->encrypt->decode($session);\r
- }\r
- else\r
- { \r
- // encryption was not used, so we need to check the md5 hash\r
- $hash = substr($session, strlen($session)-32); // get last 32 chars\r
- $session = substr($session, 0, strlen($session)-32);\r
-\r
- // Does the md5 hash match? This is to prevent manipulation of session data in userspace\r
- if ($hash !== md5($session.$this->encryption_key))\r
- {\r
- log_message('error', 'The session cookie data did not match what was expected. This could be a possible hacking attempt.');\r
- $this->sess_destroy();\r
- return FALSE;\r
- }\r
- }\r
- \r
- // Unserialize the session array\r
- $session = $this->_unserialize($session);\r
- \r
- // Is the session data we unserialized an array with the correct format?\r
- if ( ! is_array($session) OR ! isset($session['session_id']) OR ! isset($session['ip_address']) OR ! isset($session['user_agent']) OR ! isset($session['last_activity']))\r
- {\r
- $this->sess_destroy();\r
- return FALSE;\r
- }\r
- \r
- // Is the session current?\r
- if (($session['last_activity'] + $this->sess_expiration) < $this->now)\r
- {\r
- $this->sess_destroy();\r
- return FALSE;\r
- }\r
-\r
- // Does the IP Match?\r
- if ($this->sess_match_ip == TRUE AND $session['ip_address'] != $this->CI->input->ip_address())\r
- {\r
- $this->sess_destroy();\r
- return FALSE;\r
- }\r
- \r
- // Does the User Agent Match?\r
- if ($this->sess_match_useragent == TRUE AND trim($session['user_agent']) != trim(substr($this->CI->input->user_agent(), 0, 50)))\r
- {\r
- $this->sess_destroy();\r
- return FALSE;\r
- }\r
- \r
- // Is there a corresponding session in the DB?\r
- if ($this->sess_use_database === TRUE)\r
- {\r
- $this->CI->db->where('session_id', $session['session_id']);\r
- \r
- if ($this->sess_match_ip == TRUE)\r
- {\r
- $this->CI->db->where('ip_address', $session['ip_address']);\r
- }\r
-\r
- if ($this->sess_match_useragent == TRUE)\r
- {\r
- $this->CI->db->where('user_agent', $session['user_agent']);\r
- }\r
- \r
- $query = $this->CI->db->get($this->sess_table_name);\r
-\r
- // No result? Kill it!\r
- if ($query->num_rows() == 0)\r
- {\r
- $this->sess_destroy();\r
- return FALSE;\r
- }\r
-\r
- // Is there custom data? If so, add it to the main session array\r
- $row = $query->row();\r
- if (isset($row->user_data) AND $row->user_data != '')\r
- {\r
- $custom_data = $this->_unserialize($row->user_data);\r
-\r
- if (is_array($custom_data))\r
- {\r
- foreach ($custom_data as $key => $val)\r
- {\r
- $session[$key] = $val;\r
- }\r
- }\r
- } \r
- }\r
- \r
- // Session is valid!\r
- $this->userdata = $session;\r
- unset($session);\r
- \r
- return TRUE;\r
- }\r
- \r
- // --------------------------------------------------------------------\r
- \r
- /**\r
- * Write the session data\r
- *\r
- * @access public\r
- * @return void\r
- */\r
- function sess_write()\r
- {\r
- // Are we saving custom data to the DB? If not, all we do is update the cookie\r
- if ($this->sess_use_database === FALSE)\r
- {\r
- $this->_set_cookie();\r
- return;\r
- }\r
-\r
- // set the custom userdata, the session data we will set in a second\r
- $custom_userdata = $this->userdata;\r
- $cookie_userdata = array();\r
- \r
- // Before continuing, we need to determine if there is any custom data to deal with.\r
- // Let's determine this by removing the default indexes to see if there's anything left in the array\r
- // and set the session data while we're at it\r
- foreach (array('session_id','ip_address','user_agent','last_activity') as $val)\r
- {\r
- unset($custom_userdata[$val]);\r
- $cookie_userdata[$val] = $this->userdata[$val];\r
- }\r
- \r
- // Did we find any custom data? If not, we turn the empty array into a string\r
- // since there's no reason to serialize and store an empty array in the DB\r
- if (count($custom_userdata) === 0)\r
- {\r
- $custom_userdata = '';\r
- }\r
- else\r
- { \r
- // Serialize the custom data array so we can store it\r
- $custom_userdata = $this->_serialize($custom_userdata);\r
- }\r
- \r
- // Run the update query\r
- $this->CI->db->where('session_id', $this->userdata['session_id']);\r
- $this->CI->db->update($this->sess_table_name, array('last_activity' => $this->userdata['last_activity'], 'user_data' => $custom_userdata));\r
-\r
- // Write the cookie. Notice that we manually pass the cookie data array to the\r
- // _set_cookie() function. Normally that function will store $this->userdata, but \r
- // in this case that array contains custom data, which we do not want in the cookie.\r
- $this->_set_cookie($cookie_userdata);\r
- }\r
- \r
- // --------------------------------------------------------------------\r
- \r
- /**\r
- * Create a new session\r
- *\r
- * @access public\r
- * @return void\r
- */\r
- function sess_create()\r
- { \r
- $sessid = '';\r
- while (strlen($sessid) < 32)\r
- {\r
- $sessid .= mt_rand(0, mt_getrandmax());\r
- }\r
- \r
- // To make the session ID even more secure we'll combine it with the user's IP\r
- $sessid .= $this->CI->input->ip_address();\r
- \r
- $this->userdata = array(\r
- 'session_id' => md5(uniqid($sessid, TRUE)),\r
- 'ip_address' => $this->CI->input->ip_address(),\r
- 'user_agent' => substr($this->CI->input->user_agent(), 0, 50),\r
- 'last_activity' => $this->now\r
- );\r
- \r
- \r
- // Save the data to the DB if needed\r
- if ($this->sess_use_database === TRUE)\r
- {\r
- $this->CI->db->query($this->CI->db->insert_string($this->sess_table_name, $this->userdata));\r
- }\r
- \r
- // Write the cookie\r
- $this->_set_cookie();\r
- }\r
- \r
- // --------------------------------------------------------------------\r
- \r
- /**\r
- * Update an existing session\r
- *\r
- * @access public\r
- * @return void\r
- */\r
- function sess_update()\r
- {\r
- // We only update the session every five minutes by default\r
- if (($this->userdata['last_activity'] + $this->sess_time_to_update) >= $this->now)\r
- {\r
- return;\r
- }\r
- \r
- // Save the old session id so we know which record to \r
- // update in the database if we need it\r
- $old_sessid = $this->userdata['session_id'];\r
- $new_sessid = '';\r
- while (strlen($new_sessid) < 32)\r
- {\r
- $new_sessid .= mt_rand(0, mt_getrandmax());\r
- }\r
- \r
- // To make the session ID even more secure we'll combine it with the user's IP\r
- $new_sessid .= $this->CI->input->ip_address();\r
- \r
- // Turn it into a hash\r
- $new_sessid = md5(uniqid($new_sessid, TRUE));\r
- \r
- // Update the session data in the session data array\r
- $this->userdata['session_id'] = $new_sessid;\r
- $this->userdata['last_activity'] = $this->now;\r
- \r
- // _set_cookie() will handle this for us if we aren't using database sessions\r
- // by pushing all userdata to the cookie.\r
- $cookie_data = NULL;\r
- \r
- // Update the session ID and last_activity field in the DB if needed\r
- if ($this->sess_use_database === TRUE)\r
- {\r
- // set cookie explicitly to only have our session data\r
- $cookie_data = array();\r
- foreach (array('session_id','ip_address','user_agent','last_activity') as $val)\r
- {\r
- $cookie_data[$val] = $this->userdata[$val];\r
- }\r
- \r
- $this->CI->db->query($this->CI->db->update_string($this->sess_table_name, array('last_activity' => $this->now, 'session_id' => $new_sessid), array('session_id' => $old_sessid)));\r
- }\r
- \r
- // Write the cookie\r
- $this->_set_cookie($cookie_data);\r
- }\r
- \r
- // --------------------------------------------------------------------\r
- \r
- /**\r
- * Destroy the current session\r
- *\r
- * @access public\r
- * @return void\r
- */\r
- function sess_destroy()\r
- { \r
- // Kill the session DB row\r
- if ($this->sess_use_database === TRUE AND isset($this->userdata['session_id']))\r
- {\r
- $this->CI->db->where('session_id', $this->userdata['session_id']);\r
- $this->CI->db->delete($this->sess_table_name);\r
- }\r
- \r
- // Kill the cookie\r
- setcookie(\r
- $this->sess_cookie_name,\r
- addslashes(serialize(array())),\r
- ($this->now - 31500000),\r
- $this->cookie_path,\r
- $this->cookie_domain,\r
- 0\r
- );\r
- }\r
- \r
- // --------------------------------------------------------------------\r
- \r
- /**\r
- * Fetch a specific item from the session array\r
- *\r
- * @access public\r
- * @param string\r
- * @return string\r
- */ \r
- function userdata($item)\r
- {\r
- return ( ! isset($this->userdata[$item])) ? FALSE : $this->userdata[$item];\r
- }\r
-\r
- // --------------------------------------------------------------------\r
- \r
- /**\r
- * Fetch all session data\r
- *\r
- * @access public\r
- * @return mixed\r
- */ \r
- function all_userdata()\r
- {\r
- return ( ! isset($this->userdata)) ? FALSE : $this->userdata;\r
- }\r
- \r
- // --------------------------------------------------------------------\r
- \r
- /**\r
- * Add or change data in the "userdata" array\r
- *\r
- * @access public\r
- * @param mixed\r
- * @param string\r
- * @return void\r
- */ \r
- function set_userdata($newdata = array(), $newval = '')\r
- {\r
- if (is_string($newdata))\r
- {\r
- $newdata = array($newdata => $newval);\r
- }\r
- \r
- if (count($newdata) > 0)\r
- {\r
- foreach ($newdata as $key => $val)\r
- {\r
- $this->userdata[$key] = $val;\r
- }\r
- }\r
-\r
- $this->sess_write();\r
- }\r
- \r
- // --------------------------------------------------------------------\r
- \r
- /**\r
- * Delete a session variable from the "userdata" array\r
- *\r
- * @access array\r
- * @return void\r
- */ \r
- function unset_userdata($newdata = array())\r
- {\r
- if (is_string($newdata))\r
- {\r
- $newdata = array($newdata => '');\r
- }\r
- \r
- if (count($newdata) > 0)\r
- {\r
- foreach ($newdata as $key => $val)\r
- {\r
- unset($this->userdata[$key]);\r
- }\r
- }\r
- \r
- $this->sess_write();\r
- }\r
- \r
- // ------------------------------------------------------------------------\r
-\r
- /**\r
- * Add or change flashdata, only available\r
- * until the next request\r
- *\r
- * @access public\r
- * @param mixed\r
- * @param string\r
- * @return void\r
- */\r
- function set_flashdata($newdata = array(), $newval = '')\r
- {\r
- if (is_string($newdata))\r
- {\r
- $newdata = array($newdata => $newval);\r
- }\r
- \r
- if (count($newdata) > 0)\r
- {\r
- foreach ($newdata as $key => $val)\r
- {\r
- $flashdata_key = $this->flashdata_key.':new:'.$key;\r
- $this->set_userdata($flashdata_key, $val);\r
- }\r
- }\r
- } \r
- \r
- // ------------------------------------------------------------------------\r
-\r
- /**\r
- * Keeps existing flashdata available to next request.\r
- *\r
- * @access public\r
- * @param string\r
- * @return void\r
- */\r
- function keep_flashdata($key)\r
- {\r
- // 'old' flashdata gets removed. Here we mark all \r
- // flashdata as 'new' to preserve it from _flashdata_sweep()\r
- // Note the function will return FALSE if the $key \r
- // provided cannot be found\r
- $old_flashdata_key = $this->flashdata_key.':old:'.$key;\r
- $value = $this->userdata($old_flashdata_key);\r
-\r
- $new_flashdata_key = $this->flashdata_key.':new:'.$key;\r
- $this->set_userdata($new_flashdata_key, $value);\r
- }\r
- \r
- // ------------------------------------------------------------------------\r
-\r
- /**\r
- * Fetch a specific flashdata item from the session array\r
- *\r
- * @access public\r
- * @param string\r
- * @return string\r
- */ \r
- function flashdata($key)\r
- {\r
- $flashdata_key = $this->flashdata_key.':old:'.$key;\r
- return $this->userdata($flashdata_key);\r
- }\r
-\r
- // ------------------------------------------------------------------------\r
-\r
- /**\r
- * Identifies flashdata as 'old' for removal\r
- * when _flashdata_sweep() runs.\r
- *\r
- * @access private\r
- * @return void\r
- */\r
- function _flashdata_mark()\r
- {\r
- $userdata = $this->all_userdata();\r
- foreach ($userdata as $name => $value)\r
- {\r
- $parts = explode(':new:', $name);\r
- if (is_array($parts) && count($parts) === 2)\r
- {\r
- $new_name = $this->flashdata_key.':old:'.$parts[1];\r
- $this->set_userdata($new_name, $value);\r
- $this->unset_userdata($name);\r
- }\r
- }\r
- }\r
-\r
- // ------------------------------------------------------------------------\r
-\r
- /**\r
- * Removes all flashdata marked as 'old'\r
- *\r
- * @access private\r
- * @return void\r
- */\r
-\r
- function _flashdata_sweep()\r
- {\r
- $userdata = $this->all_userdata();\r
- foreach ($userdata as $key => $value)\r
- {\r
- if (strpos($key, ':old:'))\r
- {\r
- $this->unset_userdata($key);\r
- }\r
- }\r
-\r
- }\r
-\r
- // --------------------------------------------------------------------\r
- \r
- /**\r
- * Get the "now" time\r
- *\r
- * @access private\r
- * @return string\r
- */\r
- function _get_time()\r
- {\r
- if (strtolower($this->time_reference) == 'gmt')\r
- {\r
- $now = time();\r
- $time = mktime(gmdate("H", $now), gmdate("i", $now), gmdate("s", $now), gmdate("m", $now), gmdate("d", $now), gmdate("Y", $now));\r
- }\r
- else\r
- {\r
- $time = time();\r
- }\r
- \r
- return $time;\r
- }\r
-\r
- // --------------------------------------------------------------------\r
- \r
- /**\r
- * Write the session cookie\r
- *\r
- * @access public\r
- * @return void\r
- */\r
- function _set_cookie($cookie_data = NULL)\r
- {\r
- if (is_null($cookie_data))\r
- {\r
- $cookie_data = $this->userdata;\r
- }\r
- \r
- // Serialize the userdata for the cookie\r
- $cookie_data = $this->_serialize($cookie_data);\r
- \r
- if ($this->sess_encrypt_cookie == TRUE)\r
- {\r
- $cookie_data = $this->CI->encrypt->encode($cookie_data);\r
- }\r
- else\r
- {\r
- // if encryption is not used, we provide an md5 hash to prevent userside tampering\r
- $cookie_data = $cookie_data.md5($cookie_data.$this->encryption_key);\r
- }\r
- \r
- // Set the cookie\r
- setcookie(\r
- $this->sess_cookie_name,\r
- $cookie_data,\r
- $this->sess_expiration + time(),\r
- $this->cookie_path,\r
- $this->cookie_domain,\r
- 0\r
- );\r
- }\r
-\r
- // --------------------------------------------------------------------\r
- \r
- /**\r
- * Serialize an array\r
- *\r
- * This function first converts any slashes found in the array to a temporary\r
- * marker, so when it gets unserialized the slashes will be preserved\r
- *\r
- * @access private\r
- * @param array\r
- * @return string\r
- */ \r
- function _serialize($data)\r
- {\r
- if (is_array($data))\r
- {\r
- foreach ($data as $key => $val)\r
- {\r
- $data[$key] = str_replace('\\', '{{slash}}', $val);\r
- }\r
- }\r
- else\r
- {\r
- $data = str_replace('\\', '{{slash}}', $data);\r
- }\r
- \r
- return serialize($data);\r
- }\r
-\r
- // --------------------------------------------------------------------\r
- \r
- /**\r
- * Unserialize\r
- *\r
- * This function unserializes a data string, then converts any\r
- * temporary slash markers back to actual slashes\r
- *\r
- * @access private\r
- * @param array\r
- * @return string\r
- */ \r
- function _unserialize($data)\r
- {\r
- $data = @unserialize(strip_slashes($data));\r
- \r
- if (is_array($data))\r
- {\r
- foreach ($data as $key => $val)\r
- {\r
- $data[$key] = str_replace('{{slash}}', '\\', $val);\r
- }\r
- \r
- return $data;\r
- }\r
- \r
- return str_replace('{{slash}}', '\\', $data);\r
- }\r
-\r
- // --------------------------------------------------------------------\r
- \r
- /**\r
- * Garbage collection\r
- *\r
- * This deletes expired session rows from database\r
- * if the probability percentage is met\r
- *\r
- * @access public\r
- * @return void\r
- */\r
- function _sess_gc()\r
- {\r
- if ($this->sess_use_database != TRUE)\r
- {\r
- return;\r
- }\r
- \r
- srand(time());\r
- if ((rand() % 100) < $this->gc_probability)\r
- {\r
- $expire = $this->now - $this->sess_expiration;\r
- \r
- $this->CI->db->where("last_activity < {$expire}");\r
- $this->CI->db->delete($this->sess_table_name);\r
-\r
- log_message('debug', 'Session garbage collection performed.');\r
- }\r
- }\r
-\r
- \r
-}\r
-// END Session Class\r
-\r
-/* End of file Session.php */\r
+<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
+/**
+ * CodeIgniter
+ *
+ * An open source application development framework for PHP 4.3.2 or newer
+ *
+ * @package CodeIgniter
+ * @author ExpressionEngine Dev Team
+ * @copyright Copyright (c) 2008, EllisLab, Inc.
+ * @license http://codeigniter.com/user_guide/license.html
+ * @link http://codeigniter.com
+ * @since Version 1.0
+ * @filesource
+ */
+
+// ------------------------------------------------------------------------
+
+/**
+ * Session Class
+ *
+ * @package CodeIgniter
+ * @subpackage Libraries
+ * @category Sessions
+ * @author ExpressionEngine Dev Team
+ * @link http://codeigniter.com/user_guide/libraries/sessions.html
+ */
+class CI_Session {
+
+ var $sess_encrypt_cookie = FALSE;
+ var $sess_use_database = FALSE;
+ var $sess_table_name = '';
+ var $sess_expiration = 7200;
+ var $sess_match_ip = FALSE;
+ var $sess_match_useragent = TRUE;
+ var $sess_cookie_name = 'ci_session';
+ var $cookie_prefix = '';
+ var $cookie_path = '';
+ var $cookie_domain = '';
+ var $sess_time_to_update = 300;
+ var $encryption_key = '';
+ var $flashdata_key = 'flash';
+ var $time_reference = 'time';
+ var $gc_probability = 5;
+ var $userdata = array();
+ var $CI;
+ var $now;
+
+ /**
+ * Session Constructor
+ *
+ * The constructor runs the session routines automatically
+ * whenever the class is instantiated.
+ */
+ function CI_Session($params = array())
+ {
+ log_message('debug', "Session Class Initialized");
+
+ // Set the super object to a local variable for use throughout the class
+ $this->CI =& get_instance();
+
+ // Set all the session preferences, which can either be set
+ // manually via the $params array above or via the config file
+ foreach (array('sess_encrypt_cookie', 'sess_use_database', 'sess_table_name', 'sess_expiration', 'sess_match_ip', 'sess_match_useragent', 'sess_cookie_name', 'cookie_path', 'cookie_domain', 'sess_time_to_update', 'time_reference', 'cookie_prefix', 'encryption_key') as $key)
+ {
+ $this->$key = (isset($params[$key])) ? $params[$key] : $this->CI->config->item($key);
+ }
+
+ // Load the string helper so we can use the strip_slashes() function
+ $this->CI->load->helper('string');
+
+ // Do we need encryption? If so, load the encryption class
+ if ($this->sess_encrypt_cookie == TRUE)
+ {
+ $this->CI->load->library('encrypt');
+ }
+
+ // Are we using a database? If so, load it
+ if ($this->sess_use_database === TRUE AND $this->sess_table_name != '')
+ {
+ $this->CI->load->database();
+ }
+
+ // Set the "now" time. Can either be GMT or server time, based on the
+ // config prefs. We use this to set the "last activity" time
+ $this->now = $this->_get_time();
+
+ // Set the session length. If the session expiration is
+ // set to zero we'll set the expiration two years from now.
+ if ($this->sess_expiration == 0)
+ {
+ $this->sess_expiration = (60*60*24*365*2);
+ }
+
+ // Set the cookie name
+ $this->sess_cookie_name = $this->cookie_prefix.$this->sess_cookie_name;
+
+ // Run the Session routine. If a session doesn't exist we'll
+ // create a new one. If it does, we'll update it.
+ if ( ! $this->sess_read())
+ {
+ $this->sess_create();
+ }
+ else
+ {
+ $this->sess_update();
+ }
+
+ // Delete 'old' flashdata (from last request)
+ $this->_flashdata_sweep();
+
+ // Mark all new flashdata as old (data will be deleted before next request)
+ $this->_flashdata_mark();
+
+ // Delete expired sessions if necessary
+ $this->_sess_gc();
+
+ log_message('debug', "Session routines successfully run");
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Fetch the current session data if it exists
+ *
+ * @access public
+ * @return void
+ */
+ function sess_read()
+ {
+ // Fetch the cookie
+ $session = $this->CI->input->cookie($this->sess_cookie_name);
+
+ // No cookie? Goodbye cruel world!...
+ if ($session === FALSE)
+ {
+ log_message('debug', 'A session cookie was not found.');
+ return FALSE;
+ }
+
+ // Decrypt the cookie data
+ if ($this->sess_encrypt_cookie == TRUE)
+ {
+ $session = $this->CI->encrypt->decode($session);
+ }
+ else
+ {
+ // encryption was not used, so we need to check the md5 hash
+ $hash = substr($session, strlen($session)-32); // get last 32 chars
+ $session = substr($session, 0, strlen($session)-32);
+
+ // Does the md5 hash match? This is to prevent manipulation of session data in userspace
+ if ($hash !== md5($session.$this->encryption_key))
+ {
+ log_message('error', 'The session cookie data did not match what was expected. This could be a possible hacking attempt.');
+ $this->sess_destroy();
+ return FALSE;
+ }
+ }
+
+ // Unserialize the session array
+ $session = $this->_unserialize($session);
+
+ // Is the session data we unserialized an array with the correct format?
+ if ( ! is_array($session) OR ! isset($session['session_id']) OR ! isset($session['ip_address']) OR ! isset($session['user_agent']) OR ! isset($session['last_activity']))
+ {
+ $this->sess_destroy();
+ return FALSE;
+ }
+
+ // Is the session current?
+ if (($session['last_activity'] + $this->sess_expiration) < $this->now)
+ {
+ $this->sess_destroy();
+ return FALSE;
+ }
+
+ // Does the IP Match?
+ if ($this->sess_match_ip == TRUE AND $session['ip_address'] != $this->CI->input->ip_address())
+ {
+ $this->sess_destroy();
+ return FALSE;
+ }
+
+ // Does the User Agent Match?
+ if ($this->sess_match_useragent == TRUE AND trim($session['user_agent']) != trim(substr($this->CI->input->user_agent(), 0, 50)))
+ {
+ $this->sess_destroy();
+ return FALSE;
+ }
+
+ // Is there a corresponding session in the DB?
+ if ($this->sess_use_database === TRUE)
+ {
+ $this->CI->db->where('session_id', $session['session_id']);
+
+ if ($this->sess_match_ip == TRUE)
+ {
+ $this->CI->db->where('ip_address', $session['ip_address']);
+ }
+
+ if ($this->sess_match_useragent == TRUE)
+ {
+ $this->CI->db->where('user_agent', $session['user_agent']);
+ }
+
+ $query = $this->CI->db->get($this->sess_table_name);
+
+ // No result? Kill it!
+ if ($query->num_rows() == 0)
+ {
+ $this->sess_destroy();
+ return FALSE;
+ }
+
+ // Is there custom data? If so, add it to the main session array
+ $row = $query->row();
+ if (isset($row->user_data) AND $row->user_data != '')
+ {
+ $custom_data = $this->_unserialize($row->user_data);
+
+ if (is_array($custom_data))
+ {
+ foreach ($custom_data as $key => $val)
+ {
+ $session[$key] = $val;
+ }
+ }
+ }
+ }
+
+ // Session is valid!
+ $this->userdata = $session;
+ unset($session);
+
+ return TRUE;
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Write the session data
+ *
+ * @access public
+ * @return void
+ */
+ function sess_write()
+ {
+ // Are we saving custom data to the DB? If not, all we do is update the cookie
+ if ($this->sess_use_database === FALSE)
+ {
+ $this->_set_cookie();
+ return;
+ }
+
+ // set the custom userdata, the session data we will set in a second
+ $custom_userdata = $this->userdata;
+ $cookie_userdata = array();
+
+ // Before continuing, we need to determine if there is any custom data to deal with.
+ // Let's determine this by removing the default indexes to see if there's anything left in the array
+ // and set the session data while we're at it
+ foreach (array('session_id','ip_address','user_agent','last_activity') as $val)
+ {
+ unset($custom_userdata[$val]);
+ $cookie_userdata[$val] = $this->userdata[$val];
+ }
+
+ // Did we find any custom data? If not, we turn the empty array into a string
+ // since there's no reason to serialize and store an empty array in the DB
+ if (count($custom_userdata) === 0)
+ {
+ $custom_userdata = '';
+ }
+ else
+ {
+ // Serialize the custom data array so we can store it
+ $custom_userdata = $this->_serialize($custom_userdata);
+ }
+
+ // Run the update query
+ $this->CI->db->where('session_id', $this->userdata['session_id']);
+ $this->CI->db->update($this->sess_table_name, array('last_activity' => $this->userdata['last_activity'], 'user_data' => $custom_userdata));
+
+ // Write the cookie. Notice that we manually pass the cookie data array to the
+ // _set_cookie() function. Normally that function will store $this->userdata, but
+ // in this case that array contains custom data, which we do not want in the cookie.
+ $this->_set_cookie($cookie_userdata);
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Create a new session
+ *
+ * @access public
+ * @return void
+ */
+ function sess_create()
+ {
+ $sessid = '';
+ while (strlen($sessid) < 32)
+ {
+ $sessid .= mt_rand(0, mt_getrandmax());
+ }
+
+ // To make the session ID even more secure we'll combine it with the user's IP
+ $sessid .= $this->CI->input->ip_address();
+
+ $this->userdata = array(
+ 'session_id' => md5(uniqid($sessid, TRUE)),
+ 'ip_address' => $this->CI->input->ip_address(),
+ 'user_agent' => substr($this->CI->input->user_agent(), 0, 50),
+ 'last_activity' => $this->now
+ );
+
+
+ // Save the data to the DB if needed
+ if ($this->sess_use_database === TRUE)
+ {
+ $this->CI->db->query($this->CI->db->insert_string($this->sess_table_name, $this->userdata));
+ }
+
+ // Write the cookie
+ $this->_set_cookie();
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Update an existing session
+ *
+ * @access public
+ * @return void
+ */
+ function sess_update()
+ {
+ // We only update the session every five minutes by default
+ if (($this->userdata['last_activity'] + $this->sess_time_to_update) >= $this->now)
+ {
+ return;
+ }
+
+ // Save the old session id so we know which record to
+ // update in the database if we need it
+ $old_sessid = $this->userdata['session_id'];
+ $new_sessid = '';
+ while (strlen($new_sessid) < 32)
+ {
+ $new_sessid .= mt_rand(0, mt_getrandmax());
+ }
+
+ // To make the session ID even more secure we'll combine it with the user's IP
+ $new_sessid .= $this->CI->input->ip_address();
+
+ // Turn it into a hash
+ $new_sessid = md5(uniqid($new_sessid, TRUE));
+
+ // Update the session data in the session data array
+ $this->userdata['session_id'] = $new_sessid;
+ $this->userdata['last_activity'] = $this->now;
+
+ // _set_cookie() will handle this for us if we aren't using database sessions
+ // by pushing all userdata to the cookie.
+ $cookie_data = NULL;
+
+ // Update the session ID and last_activity field in the DB if needed
+ if ($this->sess_use_database === TRUE)
+ {
+ // set cookie explicitly to only have our session data
+ $cookie_data = array();
+ foreach (array('session_id','ip_address','user_agent','last_activity') as $val)
+ {
+ $cookie_data[$val] = $this->userdata[$val];
+ }
+
+ $this->CI->db->query($this->CI->db->update_string($this->sess_table_name, array('last_activity' => $this->now, 'session_id' => $new_sessid), array('session_id' => $old_sessid)));
+ }
+
+ // Write the cookie
+ $this->_set_cookie($cookie_data);
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Destroy the current session
+ *
+ * @access public
+ * @return void
+ */
+ function sess_destroy()
+ {
+ // Kill the session DB row
+ if ($this->sess_use_database === TRUE AND isset($this->userdata['session_id']))
+ {
+ $this->CI->db->where('session_id', $this->userdata['session_id']);
+ $this->CI->db->delete($this->sess_table_name);
+ }
+
+ // Kill the cookie
+ setcookie(
+ $this->sess_cookie_name,
+ addslashes(serialize(array())),
+ ($this->now - 31500000),
+ $this->cookie_path,
+ $this->cookie_domain,
+ 0
+ );
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Fetch a specific item from the session array
+ *
+ * @access public
+ * @param string
+ * @return string
+ */
+ function userdata($item)
+ {
+ return ( ! isset($this->userdata[$item])) ? FALSE : $this->userdata[$item];
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Fetch all session data
+ *
+ * @access public
+ * @return mixed
+ */
+ function all_userdata()
+ {
+ return ( ! isset($this->userdata)) ? FALSE : $this->userdata;
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Add or change data in the "userdata" array
+ *
+ * @access public
+ * @param mixed
+ * @param string
+ * @return void
+ */
+ function set_userdata($newdata = array(), $newval = '')
+ {
+ if (is_string($newdata))
+ {
+ $newdata = array($newdata => $newval);
+ }
+
+ if (count($newdata) > 0)
+ {
+ foreach ($newdata as $key => $val)
+ {
+ $this->userdata[$key] = $val;
+ }
+ }
+
+ $this->sess_write();
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Delete a session variable from the "userdata" array
+ *
+ * @access array
+ * @return void
+ */
+ function unset_userdata($newdata = array())
+ {
+ if (is_string($newdata))
+ {
+ $newdata = array($newdata => '');
+ }
+
+ if (count($newdata) > 0)
+ {
+ foreach ($newdata as $key => $val)
+ {
+ unset($this->userdata[$key]);
+ }
+ }
+
+ $this->sess_write();
+ }
+
+ // ------------------------------------------------------------------------
+
+ /**
+ * Add or change flashdata, only available
+ * until the next request
+ *
+ * @access public
+ * @param mixed
+ * @param string
+ * @return void
+ */
+ function set_flashdata($newdata = array(), $newval = '')
+ {
+ if (is_string($newdata))
+ {
+ $newdata = array($newdata => $newval);
+ }
+
+ if (count($newdata) > 0)
+ {
+ foreach ($newdata as $key => $val)
+ {
+ $flashdata_key = $this->flashdata_key.':new:'.$key;
+ $this->set_userdata($flashdata_key, $val);
+ }
+ }
+ }
+
+ // ------------------------------------------------------------------------
+
+ /**
+ * Keeps existing flashdata available to next request.
+ *
+ * @access public
+ * @param string
+ * @return void
+ */
+ function keep_flashdata($key)
+ {
+ // 'old' flashdata gets removed. Here we mark all
+ // flashdata as 'new' to preserve it from _flashdata_sweep()
+ // Note the function will return FALSE if the $key
+ // provided cannot be found
+ $old_flashdata_key = $this->flashdata_key.':old:'.$key;
+ $value = $this->userdata($old_flashdata_key);
+
+ $new_flashdata_key = $this->flashdata_key.':new:'.$key;
+ $this->set_userdata($new_flashdata_key, $value);
+ }
+
+ // ------------------------------------------------------------------------
+
+ /**
+ * Fetch a specific flashdata item from the session array
+ *
+ * @access public
+ * @param string
+ * @return string
+ */
+ function flashdata($key)
+ {
+ $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);
+ }
+ }
+
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * 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);
+ }
+
+ // Set the cookie
+ setcookie(
+ $this->sess_cookie_name,
+ $cookie_data,
+ $this->sess_expiration + time(),
+ $this->cookie_path,
+ $this->cookie_domain,
+ 0
+ );
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Serialize an array
+ *
+ * This function first converts any slashes found in the array to a temporary
+ * marker, so when it gets unserialized the slashes will be preserved
+ *
+ * @access private
+ * @param array
+ * @return string
+ */
+ function _serialize($data)
+ {
+ if (is_array($data))
+ {
+ foreach ($data as $key => $val)
+ {
+ $data[$key] = str_replace('\\', '{{slash}}', $val);
+ }
+ }
+ else
+ {
+ $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)
+ {
+ $data[$key] = str_replace('{{slash}}', '\\', $val);
+ }
+
+ return $data;
+ }
+
+ return str_replace('{{slash}}', '\\', $data);
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Garbage collection
+ *
+ * This deletes expired session rows from database
+ * if the probability percentage is met
+ *
+ * @access public
+ * @return void
+ */
+ function _sess_gc()
+ {
+ if ($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 */
\ No newline at end of file
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