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<?php |
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/* |
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+-----------------------------------------------------------------------+ |
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| program/include/rcube_session.php | |
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| | |
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| This file is part of the Roundcube Webmail client | |
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| Copyright (C) 2005-2012, The Roundcube Dev Team | |
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| Copyright (C) 2011, Kolab Systems AG | |
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| | |
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| Licensed under the GNU General Public License version 3 or | |
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| any later version with exceptions for skins & plugins. | |
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| See the README file for a full license statement. | |
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| | |
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| PURPOSE: | |
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| Provide database supported session management | |
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| | |
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+-----------------------------------------------------------------------+ |
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| Author: Thomas Bruederli <roundcube@gmail.com> | |
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| Author: Aleksander Machniak <alec@alec.pl> | |
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+-----------------------------------------------------------------------+ |
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$Id: session.inc 2932 2009-09-07 12:51:21Z alec $ |
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*/ |
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/** |
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* Class to provide database supported session storage |
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* |
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* @package Core |
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* @author Thomas Bruederli <roundcube@gmail.com> |
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* @author Aleksander Machniak <alec@alec.pl> |
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*/ |
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class rcube_session |
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{ |
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private $db; |
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private $ip; |
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private $start; |
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private $changed; |
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private $unsets = array(); |
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private $gc_handlers = array(); |
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private $cookiename = 'roundcube_sessauth'; |
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private $vars = false; |
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private $key; |
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private $now; |
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private $secret = ''; |
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private $ip_check = false; |
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private $logging = false; |
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private $keep_alive = 0; |
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private $memcache; |
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/** |
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* Default constructor |
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*/ |
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public function __construct($db, $config) |
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{ |
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$this->db = $db; |
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$this->start = microtime(true); |
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$this->ip = $_SERVER['REMOTE_ADDR']; |
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$this->logging = $config->get('log_session', false); |
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$lifetime = $config->get('session_lifetime', 1) * 60; |
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$this->set_lifetime($lifetime); |
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|
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// use memcache backend |
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if ($config->get('session_storage', 'db') == 'memcache') { |
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$this->memcache = rcube::get_instance()->get_memcache(); |
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// set custom functions for PHP session management if memcache is available |
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if ($this->memcache) { |
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session_set_save_handler( |
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array($this, 'open'), |
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array($this, 'close'), |
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array($this, 'mc_read'), |
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array($this, 'mc_write'), |
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array($this, 'mc_destroy'), |
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array($this, 'gc')); |
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} |
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else { |
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rcube::raise_error(array('code' => 604, 'type' => 'db', |
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'line' => __LINE__, 'file' => __FILE__, |
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'message' => "Failed to connect to memcached. Please check configuration"), |
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true, true); |
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} |
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} |
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else { |
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// set custom functions for PHP session management |
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session_set_save_handler( |
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array($this, 'open'), |
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array($this, 'close'), |
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array($this, 'db_read'), |
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array($this, 'db_write'), |
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array($this, 'db_destroy'), |
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array($this, 'db_gc')); |
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} |
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} |
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public function open($save_path, $session_name) |
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{ |
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return true; |
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} |
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public function close() |
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{ |
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return true; |
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} |
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/** |
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* Delete session data for the given key |
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* |
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* @param string Session ID |
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*/ |
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public function destroy($key) |
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{ |
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return $this->memcache ? $this->mc_destroy($key) : $this->db_destroy($key); |
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} |
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/** |
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* Read session data from database |
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* |
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* @param string Session ID |
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* @return string Session vars |
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*/ |
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public function db_read($key) |
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{ |
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$sql_result = $this->db->query( |
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"SELECT vars, ip, changed FROM ".$this->db->table_name('session') |
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." WHERE sess_id = ?", $key); |
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if ($sql_result && ($sql_arr = $this->db->fetch_assoc($sql_result))) { |
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$this->changed = strtotime($sql_arr['changed']); |
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$this->ip = $sql_arr['ip']; |
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$this->vars = base64_decode($sql_arr['vars']); |
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$this->key = $key; |
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if (!empty($this->vars)) |
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return $this->vars; |
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} |
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return false; |
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} |
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/** |
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* Save session data. |
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* handler for session_read() |
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* |
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* @param string Session ID |
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* @param string Serialized session vars |
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* @return boolean True on success |
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*/ |
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public function db_write($key, $vars) |
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{ |
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$ts = microtime(true); |
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$now = $this->db->fromunixtime((int)$ts); |
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// no session row in DB (db_read() returns false) |
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if (!$this->key) { |
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$oldvars = false; |
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} |
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// use internal data from read() for fast requests (up to 0.5 sec.) |
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else if ($key == $this->key && (!$this->vars || $ts - $this->start < 0.5)) { |
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$oldvars = $this->vars; |
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} |
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else { // else read data again from DB |
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$oldvars = $this->db_read($key); |
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} |
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if ($oldvars !== false) { |
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$newvars = $this->_fixvars($vars, $oldvars); |
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if ($newvars !== $oldvars) { |
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$this->db->query( |
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sprintf("UPDATE %s SET vars=?, changed=%s WHERE sess_id=?", |
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$this->db->table_name('session'), $now), |
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base64_encode($newvars), $key); |
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} |
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else if ($ts - $this->changed > $this->lifetime / 2) { |
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$this->db->query("UPDATE ".$this->db->table_name('session')." SET changed=$now WHERE sess_id=?", $key); |
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} |
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} |
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else { |
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$this->db->query( |
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sprintf("INSERT INTO %s (sess_id, vars, ip, created, changed) ". |
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"VALUES (?, ?, ?, %s, %s)", |
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$this->db->table_name('session'), $now, $now), |
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$key, base64_encode($vars), (string)$this->ip); |
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} |
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return true; |
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} |
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/** |
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* Merge vars with old vars and apply unsets |
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*/ |
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private function _fixvars($vars, $oldvars) |
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{ |
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if ($oldvars !== false) { |
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$a_oldvars = $this->unserialize($oldvars); |
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if (is_array($a_oldvars)) { |
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foreach ((array)$this->unsets as $k) |
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unset($a_oldvars[$k]); |
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$newvars = $this->serialize(array_merge( |
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(array)$a_oldvars, (array)$this->unserialize($vars))); |
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} |
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else |
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$newvars = $vars; |
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} |
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$this->unsets = array(); |
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return $newvars; |
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} |
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/** |
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* Handler for session_destroy() |
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* |
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* @param string Session ID |
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* @return boolean True on success |
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*/ |
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public function db_destroy($key) |
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{ |
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$this->db->query( |
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sprintf("DELETE FROM %s WHERE sess_id = ?", $this->db->table_name('session')), |
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$key); |
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return true; |
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} |
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/** |
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* Garbage collecting function |
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* @param string Session lifetime in seconds |
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* @return boolean True on success |
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*/ |
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public function db_gc($maxlifetime) |
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{ |
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// just delete all expired sessions |
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$this->db->query( |
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sprintf("DELETE FROM %s WHERE changed < %s", |
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$this->db->table_name('session'), $this->db->fromunixtime(time() - $maxlifetime))); |
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$this->gc(); |
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return true; |
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} |
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/** |
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* Read session data from memcache |
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* |
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* @param string Session ID |
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* @return string Session vars |
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*/ |
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public function mc_read($key) |
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{ |
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if ($value = $this->memcache->get($key)) { |
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$arr = unserialize($value); |
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$this->changed = $arr['changed']; |
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$this->ip = $arr['ip']; |
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$this->vars = $arr['vars']; |
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$this->key = $key; |
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if (!empty($this->vars)) |
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return $this->vars; |
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} |
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return false; |
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} |
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/** |
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* Save session data. |
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* handler for session_read() |
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* |
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* @param string Session ID |
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* @param string Serialized session vars |
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* @return boolean True on success |
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*/ |
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public function mc_write($key, $vars) |
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{ |
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$ts = microtime(true); |
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// no session data in cache (mc_read() returns false) |
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if (!$this->key) |
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$oldvars = false; |
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// use internal data for fast requests (up to 0.5 sec.) |
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else if ($key == $this->key && (!$this->vars || $ts - $this->start < 0.5)) |
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$oldvars = $this->vars; |
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else // else read data again |
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$oldvars = $this->mc_read($key); |
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$newvars = $oldvars !== false ? $this->_fixvars($vars, $oldvars) : $vars; |
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if ($newvars !== $oldvars || $ts - $this->changed > $this->lifetime / 2) |
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return $this->memcache->set($key, serialize(array('changed' => time(), 'ip' => $this->ip, 'vars' => $newvars)), MEMCACHE_COMPRESSED, $this->lifetime); |
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return true; |
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} |
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/** |
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* Handler for session_destroy() with memcache backend |
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* |
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* @param string Session ID |
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* @return boolean True on success |
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*/ |
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public function mc_destroy($key) |
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{ |
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return $this->memcache->delete($key); |
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} |
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/** |
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* Execute registered garbage collector routines |
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*/ |
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public function gc() |
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{ |
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foreach ($this->gc_handlers as $fct) { |
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call_user_func($fct); |
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} |
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} |
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/** |
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* Register additional garbage collector functions |
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* |
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* @param mixed Callback function |
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*/ |
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public function register_gc_handler($func) |
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{ |
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foreach ($this->gc_handlers as $handler) { |
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if ($handler == $func) { |
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return; |
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} |
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} |
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$this->gc_handlers[] = $func; |
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} |
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/** |
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* Generate and set new session id |
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* |
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* @param boolean $destroy If enabled the current session will be destroyed |
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*/ |
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public function regenerate_id($destroy=true) |
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{ |
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session_regenerate_id($destroy); |
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$this->vars = false; |
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$this->key = session_id(); |
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return true; |
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} |
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/** |
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* Unset a session variable |
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* |
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* @param string Varibale name |
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* @return boolean True on success |
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*/ |
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public function remove($var=null) |
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{ |
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if (empty($var)) |
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return $this->destroy(session_id()); |
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$this->unsets[] = $var; |
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unset($_SESSION[$var]); |
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return true; |
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} |
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/** |
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* Kill this session |
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*/ |
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public function kill() |
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{ |
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$this->vars = false; |
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$this->ip = $_SERVER['REMOTE_ADDR']; // update IP (might have changed) |
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$this->destroy(session_id()); |
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rcube_utils::setcookie($this->cookiename, '-del-', time() - 60); |
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} |
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/** |
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* Re-read session data from storage backend |
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*/ |
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public function reload() |
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{ |
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if ($this->key && $this->memcache) |
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$data = $this->mc_read($this->key); |
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else if ($this->key) |
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$data = $this->db_read($this->key); |
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if ($data) |
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session_decode($data); |
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} |
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/** |
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* Serialize session data |
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*/ |
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private function serialize($vars) |
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{ |
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$data = ''; |
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if (is_array($vars)) |
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foreach ($vars as $var=>$value) |
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$data .= $var.'|'.serialize($value); |
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else |
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$data = 'b:0;'; |
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return $data; |
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} |
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/** |
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* Unserialize session data |
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* http://www.php.net/manual/en/function.session-decode.php#56106 |
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*/ |
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private function unserialize($str) |
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{ |
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$str = (string)$str; |
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$endptr = strlen($str); |
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$p = 0; |
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$serialized = ''; |
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$items = 0; |
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$level = 0; |
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while ($p < $endptr) { |
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$q = $p; |
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while ($str[$q] != '|') |
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if (++$q >= $endptr) break 2; |
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if ($str[$p] == '!') { |
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$p++; |
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$has_value = false; |
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} else { |
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$has_value = true; |
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} |
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$name = substr($str, $p, $q - $p); |
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$q++; |
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$serialized .= 's:' . strlen($name) . ':"' . $name . '";'; |
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if ($has_value) { |
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for (;;) { |
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$p = $q; |
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switch (strtolower($str[$q])) { |
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case 'n': /* null */ |
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case 'b': /* boolean */ |
|
459 |
case 'i': /* integer */ |
|
460 |
case 'd': /* decimal */ |
|
461 |
do $q++; |
|
462 |
while ( ($q < $endptr) && ($str[$q] != ';') ); |
|
463 |
$q++; |
|
464 |
$serialized .= substr($str, $p, $q - $p); |
|
465 |
if ($level == 0) break 2; |
|
466 |
break; |
|
467 |
case 'r': /* reference */ |
|
468 |
$q+= 2; |
|
469 |
for ($id = ''; ($q < $endptr) && ($str[$q] != ';'); $q++) $id .= $str[$q]; |
|
470 |
$q++; |
|
471 |
$serialized .= 'R:' . ($id + 1) . ';'; /* increment pointer because of outer array */ |
|
472 |
if ($level == 0) break 2; |
|
473 |
break; |
|
474 |
case 's': /* string */ |
|
475 |
$q+=2; |
|
476 |
for ($length=''; ($q < $endptr) && ($str[$q] != ':'); $q++) $length .= $str[$q]; |
|
477 |
$q+=2; |
|
478 |
$q+= (int)$length + 2; |
|
479 |
$serialized .= substr($str, $p, $q - $p); |
|
480 |
if ($level == 0) break 2; |
|
481 |
break; |
|
482 |
case 'a': /* array */ |
|
483 |
case 'o': /* object */ |
|
484 |
do $q++; |
|
485 |
while ( ($q < $endptr) && ($str[$q] != '{') ); |
|
486 |
$q++; |
|
487 |
$level++; |
|
488 |
$serialized .= substr($str, $p, $q - $p); |
|
489 |
break; |
|
490 |
case '}': /* end of array|object */ |
|
491 |
$q++; |
|
492 |
$serialized .= substr($str, $p, $q - $p); |
|
493 |
if (--$level == 0) break 2; |
|
494 |
break; |
|
495 |
default: |
|
496 |
return false; |
|
497 |
} |
|
498 |
} |
|
499 |
} else { |
|
500 |
$serialized .= 'N;'; |
|
501 |
$q += 2; |
|
502 |
} |
|
503 |
$items++; |
|
504 |
$p = $q; |
|
505 |
} |
|
506 |
|
|
507 |
return unserialize( 'a:' . $items . ':{' . $serialized . '}' ); |
|
508 |
} |
|
509 |
|
88ca38
|
510 |
|
T |
511 |
/** |
|
512 |
* Setter for session lifetime |
|
513 |
*/ |
|
514 |
public function set_lifetime($lifetime) |
|
515 |
{ |
|
516 |
$this->lifetime = max(120, $lifetime); |
|
517 |
|
|
518 |
// valid time range is now - 1/2 lifetime to now + 1/2 lifetime |
|
519 |
$now = time(); |
|
520 |
$this->now = $now - ($now % ($this->lifetime / 2)); |
|
521 |
} |
|
522 |
|
cf2da2
|
523 |
/** |
T |
524 |
* Setter for keep_alive interval |
|
525 |
*/ |
929a50
|
526 |
public function set_keep_alive($keep_alive) |
A |
527 |
{ |
|
528 |
$this->keep_alive = $keep_alive; |
88ca38
|
529 |
|
T |
530 |
if ($this->lifetime < $keep_alive) |
|
531 |
$this->set_lifetime($keep_alive + 30); |
929a50
|
532 |
} |
A |
533 |
|
cf2da2
|
534 |
/** |
T |
535 |
* Getter for keep_alive interval |
|
536 |
*/ |
929a50
|
537 |
public function get_keep_alive() |
A |
538 |
{ |
|
539 |
return $this->keep_alive; |
|
540 |
} |
|
541 |
|
cf2da2
|
542 |
/** |
T |
543 |
* Getter for remote IP saved with this session |
|
544 |
*/ |
929a50
|
545 |
public function get_ip() |
A |
546 |
{ |
|
547 |
return $this->ip; |
|
548 |
} |
cf2da2
|
549 |
|
T |
550 |
/** |
|
551 |
* Setter for cookie encryption secret |
|
552 |
*/ |
|
553 |
function set_secret($secret) |
|
554 |
{ |
|
555 |
$this->secret = $secret; |
|
556 |
} |
|
557 |
|
|
558 |
|
|
559 |
/** |
|
560 |
* Enable/disable IP check |
|
561 |
*/ |
|
562 |
function set_ip_check($check) |
|
563 |
{ |
|
564 |
$this->ip_check = $check; |
|
565 |
} |
|
566 |
|
|
567 |
/** |
|
568 |
* Setter for the cookie name used for session cookie |
|
569 |
*/ |
|
570 |
function set_cookiename($cookiename) |
|
571 |
{ |
|
572 |
if ($cookiename) |
|
573 |
$this->cookiename = $cookiename; |
|
574 |
} |
|
575 |
|
|
576 |
|
|
577 |
/** |
|
578 |
* Check session authentication cookie |
|
579 |
* |
|
580 |
* @return boolean True if valid, False if not |
|
581 |
*/ |
|
582 |
function check_auth() |
|
583 |
{ |
|
584 |
$this->cookie = $_COOKIE[$this->cookiename]; |
|
585 |
$result = $this->ip_check ? $_SERVER['REMOTE_ADDR'] == $this->ip : true; |
|
586 |
|
fcc7f8
|
587 |
if (!$result) |
T |
588 |
$this->log("IP check failed for " . $this->key . "; expected " . $this->ip . "; got " . $_SERVER['REMOTE_ADDR']); |
|
589 |
|
cf2da2
|
590 |
if ($result && $this->_mkcookie($this->now) != $this->cookie) { |
58154f
|
591 |
$this->log("Session auth check failed for " . $this->key . "; timeslot = " . date('Y-m-d H:i:s', $this->now)); |
T |
592 |
$result = false; |
|
593 |
|
|
594 |
// Check if using id from a previous time slot |
|
595 |
for ($i = 1; $i <= 2; $i++) { |
|
596 |
$prev = $this->now - ($this->lifetime / 2) * $i; |
|
597 |
if ($this->_mkcookie($prev) == $this->cookie) { |
|
598 |
$this->log("Send new auth cookie for " . $this->key . ": " . $this->cookie); |
|
599 |
$this->set_auth_cookie(); |
|
600 |
$result = true; |
|
601 |
} |
fcc7f8
|
602 |
} |
58154f
|
603 |
} |
T |
604 |
|
|
605 |
if (!$result) |
|
606 |
$this->log("Session authentication failed for " . $this->key . "; invalid auth cookie sent; timeslot = " . date('Y-m-d H:i:s', $prev)); |
cf2da2
|
607 |
|
T |
608 |
return $result; |
|
609 |
} |
|
610 |
|
|
611 |
|
|
612 |
/** |
|
613 |
* Set session authentication cookie |
|
614 |
*/ |
|
615 |
function set_auth_cookie() |
|
616 |
{ |
|
617 |
$this->cookie = $this->_mkcookie($this->now); |
1aceb9
|
618 |
rcube_utils::setcookie($this->cookiename, $this->cookie, 0); |
cf2da2
|
619 |
$_COOKIE[$this->cookiename] = $this->cookie; |
T |
620 |
} |
|
621 |
|
|
622 |
|
|
623 |
/** |
|
624 |
* Create session cookie from session data |
|
625 |
* |
|
626 |
* @param int Time slot to use |
|
627 |
*/ |
|
628 |
function _mkcookie($timeslot) |
|
629 |
{ |
|
630 |
$auth_string = "$this->key,$this->secret,$timeslot"; |
|
631 |
return "S" . (function_exists('sha1') ? sha1($auth_string) : md5($auth_string)); |
|
632 |
} |
0c2596
|
633 |
|
fcc7f8
|
634 |
/** |
T |
635 |
* |
|
636 |
*/ |
|
637 |
function log($line) |
|
638 |
{ |
|
639 |
if ($this->logging) |
be98df
|
640 |
rcube::write_log('session', $line); |
fcc7f8
|
641 |
} |
929a50
|
642 |
|
A |
643 |
} |