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<?php
/*
+-----------------------------------------------------------------------+
| program/include/rcube_session.php |
| |
| This file is part of the Roundcube Webmail client |
| Copyright (C) 2005-2011, The Roundcube Dev Team |
| Copyright (C) 2011, Kolab Systems AG |
| Licensed under the GNU GPL |
| |
| PURPOSE: |
| Provide database supported session management |
| |
+-----------------------------------------------------------------------+
| Author: Thomas Bruederli <roundcube@gmail.com> |
| Author: Aleksander Machniak <alec@alec.pl> |
+-----------------------------------------------------------------------+
$Id: session.inc 2932 2009-09-07 12:51:21Z alec $
*/
/**
* Class to provide database supported session storage
*
* @package Core
* @author Thomas Bruederli <roundcube@gmail.com>
* @author Aleksander Machniak <alec@alec.pl>
*/
class rcube_session
{
private $db;
private $ip;
private $start;
private $changed;
private $unsets = array();
private $gc_handlers = array();
private $cookiename = 'roundcube_sessauth';
private $vars = false;
private $key;
private $now;
private $prev;
private $secret = '';
private $ip_check = false;
private $logging = false;
private $keep_alive = 0;
private $memcache;
/**
* Default constructor
*/
public function __construct($db, $config)
{
$this->db = $db;
$this->start = microtime(true);
$this->ip = $_SERVER['REMOTE_ADDR'];
$this->logging = $config->get('log_session', false);
$this->mc_debug = $config->get('memcache_debug', false);
$lifetime = $config->get('session_lifetime', 1) * 60;
$this->set_lifetime($lifetime);
// use memcache backend
if ($config->get('session_storage', 'db') == 'memcache') {
$this->memcache = rcmail::get_instance()->get_memcache();
// set custom functions for PHP session management if memcache is available
if ($this->memcache) {
session_set_save_handler(
array($this, 'open'),
array($this, 'close'),
array($this, 'mc_read'),
array($this, 'mc_write'),
array($this, 'mc_destroy'),
array($this, 'gc'));
}
else {
raise_error(array('code' => 604, 'type' => 'db',
'line' => __LINE__, 'file' => __FILE__,
'message' => "Failed to connect to memcached. Please check configuration"),
true, true);
}
}
else {
// set custom functions for PHP session management
session_set_save_handler(
array($this, 'open'),
array($this, 'close'),
array($this, 'db_read'),
array($this, 'db_write'),
array($this, 'db_destroy'),
array($this, 'db_gc'));
}
}
public function open($save_path, $session_name)
{
return true;
}
public function close()
{
return true;
}
/**
* Delete session data for the given key
*
* @param string Session ID
*/
public function destroy($key)
{
return $this->memcache ? $this->mc_destroy($key) : $this->db_destroy($key);
}
/**
* Read session data from database
*
* @param string Session ID
* @return string Session vars
*/
public function db_read($key)
{
$sql_result = $this->db->query(
"SELECT vars, ip, changed FROM ".get_table_name('session')
." WHERE sess_id = ?", $key);
if ($sql_result && ($sql_arr = $this->db->fetch_assoc($sql_result))) {
$this->changed = strtotime($sql_arr['changed']);
$this->ip = $sql_arr['ip'];
$this->vars = base64_decode($sql_arr['vars']);
$this->key = $key;
if (!empty($this->vars))
return $this->vars;
}
return false;
}
/**
* Save session data.
* handler for session_read()
*
* @param string Session ID
* @param string Serialized session vars
* @return boolean True on success
*/
public function db_write($key, $vars)
{
$ts = microtime(true);
$now = $this->db->fromunixtime((int)$ts);
// no session row in DB (db_read() returns false)
if (!$this->key) {
$oldvars = false;
}
// use internal data from read() for fast requests (up to 0.5 sec.)
else if ($key == $this->key && (!$this->vars || $ts - $this->start < 0.5)) {
$oldvars = $this->vars;
}
else { // else read data again from DB
$oldvars = $this->db_read($key);
}
if ($oldvars !== false) {
$newvars = $this->_fixvars($vars, $oldvars);
if ($newvars !== $oldvars) {
$this->db->query(
sprintf("UPDATE %s SET vars=?, changed=%s WHERE sess_id=?",
get_table_name('session'), $now),
base64_encode($newvars), $key);
}
else if ($ts - $this->changed > $this->lifetime / 2) {
$this->db->query("UPDATE ".get_table_name('session')." SET changed=$now WHERE sess_id=?", $key);
}
}
else {
$this->db->query(
sprintf("INSERT INTO %s (sess_id, vars, ip, created, changed) ".
"VALUES (?, ?, ?, %s, %s)",
get_table_name('session'), $now, $now),
$key, base64_encode($vars), (string)$this->ip);
}
return true;
}
/**
* Merge vars with old vars and apply unsets
*/
private function _fixvars($vars, $oldvars)
{
if ($oldvars !== false) {
$a_oldvars = $this->unserialize($oldvars);
if (is_array($a_oldvars)) {
foreach ((array)$this->unsets as $k)
unset($a_oldvars[$k]);
$newvars = $this->serialize(array_merge(
(array)$a_oldvars, (array)$this->unserialize($vars)));
}
else
$newvars = $vars;
}
$this->unsets = array();
return $newvars;
}
/**
* Handler for session_destroy()
*
* @param string Session ID
* @return boolean True on success
*/
public function db_destroy($key)
{
$this->db->query(
sprintf("DELETE FROM %s WHERE sess_id = ?", get_table_name('session')),
$key);
return true;
}
/**
* Garbage collecting function
*
* @param string Session lifetime in seconds
* @return boolean True on success
*/
public function db_gc($maxlifetime)
{
// just delete all expired sessions
$this->db->query(
sprintf("DELETE FROM %s WHERE changed < %s",
get_table_name('session'), $this->db->fromunixtime(time() - $maxlifetime)));
$this->gc();
return true;
}
/**
* Read session data from memcache
*
* @param string Session ID
* @return string Session vars
*/
public function mc_read($key)
{
$value = $this->memcache->get($key);
if ($this->mc_debug) write_log('memcache', "get($key): " . strlen($value));
if ($value && ($arr = unserialize($value))) {
$this->changed = $arr['changed'];
$this->ip = $arr['ip'];
$this->vars = $arr['vars'];
$this->key = $key;
if (!empty($this->vars))
return $this->vars;
}
return false;
}
/**
* Save session data.
* handler for session_read()
*
* @param string Session ID
* @param string Serialized session vars
* @return boolean True on success
*/
public function mc_write($key, $vars)
{
$ts = microtime(true);
// no session data in cache (mc_read() returns false)
if (!$this->key)
$oldvars = false;
// use internal data for fast requests (up to 0.5 sec.)
else if ($key == $this->key && (!$this->vars || $ts - $this->start < 0.5))
$oldvars = $this->vars;
else // else read data again
$oldvars = $this->mc_read($key);
$newvars = $oldvars !== false ? $this->_fixvars($vars, $oldvars) : $vars;
if ($newvars !== $oldvars || $ts - $this->changed > $this->lifetime / 2) {
$value = serialize(array('changed' => time(), 'ip' => $this->ip, 'vars' => $newvars));
$ret = $this->memcache->set($key, $value, MEMCACHE_COMPRESSED, $this->lifetime);
if ($this->mc_debug) {
write_log('memcache', "set($key): " . strlen($value) . ": " . ($ret ? 'OK' : 'ERR'));
write_log('memcache', "... get($key): " . strlen($this->memcache->get($key)));
}
return $ret;
}
return true;
}
/**
* Handler for session_destroy() with memcache backend
*
* @param string Session ID
* @return boolean True on success
*/
public function mc_destroy($key)
{
$ret = $this->memcache->delete($key);
if ($this->mc_debug) write_log('memcache', "delete($key): " . ($ret ? 'OK' : 'ERR'));
return $ret;
}
/**
* Execute registered garbage collector routines
*/
public function gc()
{
foreach ($this->gc_handlers as $fct)
call_user_func($fct);
}
/**
* Register additional garbage collector functions
*
* @param mixed Callback function
*/
public function register_gc_handler($func_name)
{
if ($func_name && !in_array($func_name, $this->gc_handlers))
$this->gc_handlers[] = $func_name;
}
/**
* Generate and set new session id
*
* @param boolean $destroy If enabled the current session will be destroyed
*/
public function regenerate_id($destroy=true)
{
session_regenerate_id($destroy);
$this->vars = false;
$this->key = session_id();
return true;
}
/**
* Unset a session variable
*
* @param string Varibale name
* @return boolean True on success
*/
public function remove($var=null)
{
if (empty($var))
return $this->destroy(session_id());
$this->unsets[] = $var;
unset($_SESSION[$var]);
return true;
}
/**
* Kill this session
*/
public function kill()
{
$this->vars = false;
$this->destroy(session_id());
rcmail::setcookie($this->cookiename, '-del-', time() - 60);
}
/**
* Re-read session data from storage backend
*/
public function reload()
{
if ($this->key && $this->memcache)
$data = $this->mc_read($this->key);
else if ($this->key)
$data = $this->db_read($this->key);
if ($data)
session_decode($data);
}
/**
* Serialize session data
*/
private function serialize($vars)
{
$data = '';
if (is_array($vars))
foreach ($vars as $var=>$value)
$data .= $var.'|'.serialize($value);
else
$data = 'b:0;';
return $data;
}
/**
* Unserialize session data
* http://www.php.net/manual/en/function.session-decode.php#56106
*/
private function unserialize($str)
{
$str = (string)$str;
$endptr = strlen($str);
$p = 0;
$serialized = '';
$items = 0;
$level = 0;
while ($p < $endptr) {
$q = $p;
while ($str[$q] != '|')
if (++$q >= $endptr) break 2;
if ($str[$p] == '!') {
$p++;
$has_value = false;
} else {
$has_value = true;
}
$name = substr($str, $p, $q - $p);
$q++;
$serialized .= 's:' . strlen($name) . ':"' . $name . '";';
if ($has_value) {
for (;;) {
$p = $q;
switch (strtolower($str[$q])) {
case 'n': /* null */
case 'b': /* boolean */
case 'i': /* integer */
case 'd': /* decimal */
do $q++;
while ( ($q < $endptr) && ($str[$q] != ';') );
$q++;
$serialized .= substr($str, $p, $q - $p);
if ($level == 0) break 2;
break;
case 'r': /* reference */
$q+= 2;
for ($id = ''; ($q < $endptr) && ($str[$q] != ';'); $q++) $id .= $str[$q];
$q++;
$serialized .= 'R:' . ($id + 1) . ';'; /* increment pointer because of outer array */
if ($level == 0) break 2;
break;
case 's': /* string */
$q+=2;
for ($length=''; ($q < $endptr) && ($str[$q] != ':'); $q++) $length .= $str[$q];
$q+=2;
$q+= (int)$length + 2;
$serialized .= substr($str, $p, $q - $p);
if ($level == 0) break 2;
break;
case 'a': /* array */
case 'o': /* object */
do $q++;
while ( ($q < $endptr) && ($str[$q] != '{') );
$q++;
$level++;
$serialized .= substr($str, $p, $q - $p);
break;
case '}': /* end of array|object */
$q++;
$serialized .= substr($str, $p, $q - $p);
if (--$level == 0) break 2;
break;
default:
return false;
}
}
} else {
$serialized .= 'N;';
$q += 2;
}
$items++;
$p = $q;
}
return unserialize( 'a:' . $items . ':{' . $serialized . '}' );
}
/**
* Setter for session lifetime
*/
public function set_lifetime($lifetime)
{
$this->lifetime = max(120, $lifetime);
// valid time range is now - 1/2 lifetime to now + 1/2 lifetime
$now = time();
$this->now = $now - ($now % ($this->lifetime / 2));
$this->prev = $this->now - ($this->lifetime / 2);
}
/**
* Setter for keep_alive interval
*/
public function set_keep_alive($keep_alive)
{
$this->keep_alive = $keep_alive;
if ($this->lifetime < $keep_alive)
$this->set_lifetime($keep_alive + 30);
}
/**
* Getter for keep_alive interval
*/
public function get_keep_alive()
{
return $this->keep_alive;
}
/**
* Getter for remote IP saved with this session
*/
public function get_ip()
{
return $this->ip;
}
/**
* Setter for cookie encryption secret
*/
function set_secret($secret)
{
$this->secret = $secret;
}
/**
* Enable/disable IP check
*/
function set_ip_check($check)
{
$this->ip_check = $check;
}
/**
* Setter for the cookie name used for session cookie
*/
function set_cookiename($cookiename)
{
if ($cookiename)
$this->cookiename = $cookiename;
}
/**
* Check session authentication cookie
*
* @return boolean True if valid, False if not
*/
function check_auth()
{
$this->cookie = $_COOKIE[$this->cookiename];
$result = $this->ip_check ? $_SERVER['REMOTE_ADDR'] == $this->ip : true;
if (!$result)
$this->log("IP check failed for " . $this->key . "; expected " . $this->ip . "; got " . $_SERVER['REMOTE_ADDR']);
if ($result && $this->_mkcookie($this->now) != $this->cookie) {
// Check if using id from previous time slot
if ($this->_mkcookie($this->prev) == $this->cookie) {
$this->set_auth_cookie();
}
else {
$result = false;
$this->log("Session authentication failed for " . $this->key . "; invalid auth cookie sent");
}
}
return $result;
}
/**
* Set session authentication cookie
*/
function set_auth_cookie()
{
$this->cookie = $this->_mkcookie($this->now);
rcmail::setcookie($this->cookiename, $this->cookie, 0);
$_COOKIE[$this->cookiename] = $this->cookie;
}
/**
* Create session cookie from session data
*
* @param int Time slot to use
*/
function _mkcookie($timeslot)
{
$auth_string = "$this->key,$this->secret,$timeslot";
return "S" . (function_exists('sha1') ? sha1($auth_string) : md5($auth_string));
}
/**
*
*/
function log($line)
{
if ($this->logging)
write_log('session', $line);
}
}
