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<?php
/*
+-----------------------------------------------------------------------+
| This file is part of the Roundcube Webmail client |
| Copyright (C) 2005-2012, The Roundcube Dev Team |
| Copyright (C) 2011, Kolab Systems AG |
| |
| Licensed under the GNU General Public License version 3 or |
| any later version with exceptions for skins & plugins. |
| See the README file for a full license statement. |
| |
| PURPOSE: |
| Provide database supported session management |
+-----------------------------------------------------------------------+
| Author: Thomas Bruederli <roundcube@gmail.com> |
| Author: Aleksander Machniak <alec@alec.pl> |
+-----------------------------------------------------------------------+
*/
/**
* Class to provide database supported session storage
*
* @package Framework
* @subpackage 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 $time_diff = 0;
private $reloaded = false;
private $appends = array();
private $unsets = array();
private $gc_handlers = array();
private $cookiename = 'roundcube_sessauth';
private $vars;
private $key;
private $now;
private $secret = '';
private $ip_check = false;
private $logging = false;
private $storage;
private $memcache;
/**
* Default constructor
*/
public function __construct($db, $config)
{
$this->db = $db;
$this->start = microtime(true);
$this->ip = rcube_utils::remote_addr();
$this->logging = $config->get('log_session', false);
$lifetime = $config->get('session_lifetime', 1) * 60;
$this->set_lifetime($lifetime);
// use memcache backend
$this->storage = $config->get('session_storage', 'db');
if ($this->storage == 'memcache') {
$this->memcache = rcube::get_instance()->get_memcache();
// set custom functions for PHP session management if memcache is available
if ($this->memcache) {
ini_set('session.serialize_handler', 'php');
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 {
rcube::raise_error(array('code' => 604, 'type' => 'db',
'line' => __LINE__, 'file' => __FILE__,
'message' => "Failed to connect to memcached. Please check configuration"),
true, true);
}
}
else if ($this->storage != 'php') {
ini_set('session.serialize_handler', 'php');
// set custom functions for PHP session management
session_set_save_handler(
array($this, 'open'),
array($this, 'close'),
array($this, 'db_read'),
array($this, 'db_write'),
array($this, 'db_destroy'),
array($this, 'gc'));
}
}
/**
* Wrapper for session_start()
*/
public function start()
{
session_start();
// copy some session properties to object vars
if ($this->storage == 'php') {
$this->key = session_id();
$this->ip = $_SESSION['__IP'];
$this->changed = $_SESSION['__MTIME'];
}
}
public function open($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);
}
/**
* Wrapper for session_write_close()
*/
public function write_close()
{
if ($this->storage == 'php') {
$_SESSION['__IP'] = $this->ip;
$_SESSION['__MTIME'] = time();
}
session_write_close();
// write_close() is called on script shutdown, see rcube::shutdown()
// execute cleanup functionality if enabled by session gc handler
// we do this after closing the session for better performance
$this->gc_shutdown();
}
/**
* Read session data from database
*
* @param string Session ID
*
* @return string Session vars
*/
public function db_read($key)
{
$sql_result = $this->db->query(
"SELECT vars, ip, changed, " . $this->db->now() . " AS ts"
. " FROM " . $this->db->table_name('session')
. " WHERE sess_id = ?", $key);
if ($sql_result && ($sql_arr = $this->db->fetch_assoc($sql_result))) {
$this->time_diff = time() - strtotime($sql_arr['ts']);
$this->changed = strtotime($sql_arr['changed']);
$this->ip = $sql_arr['ip'];
$this->vars = base64_decode($sql_arr['vars']);
$this->key = $key;
return !empty($this->vars) ? (string) $this->vars : '';
}
return null;
}
/**
* Save session data.
* handler for session_read()
*
* @param string Session ID
* @param string Serialized session vars
*
* @return boolean True on success
*/
public function db_write($key, $vars)
{
$now = $this->db->now();
$table = $this->db->table_name('session');
$ts = microtime(true);
// no session row in DB (db_read() returns false)
if (!$this->key) {
$oldvars = null;
}
// use internal data from read() for fast requests (up to 0.5 sec.)
else if ($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 !== null) {
$newvars = $this->_fixvars($vars, $oldvars);
if ($newvars !== $oldvars) {
$this->db->query("UPDATE $table "
. "SET changed = $now, vars = ? WHERE sess_id = ?",
base64_encode($newvars), $key);
}
else if ($ts - $this->changed + $this->time_diff > $this->lifetime / 2) {
$this->db->query("UPDATE $table SET changed = $now"
. " WHERE sess_id = ?", $key);
}
}
else {
$this->db->query("INSERT INTO $table (sess_id, vars, ip, created, changed)"
. " VALUES (?, ?, ?, $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 !== null) {
$a_oldvars = $this->unserialize($oldvars);
if (is_array($a_oldvars)) {
// remove unset keys on oldvars
foreach ((array)$this->unsets as $var) {
if (isset($a_oldvars[$var])) {
unset($a_oldvars[$var]);
}
else {
$path = explode('.', $var);
$k = array_pop($path);
$node = &$this->get_node($path, $a_oldvars);
unset($node[$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)
{
if ($key) {
$this->db->query(sprintf("DELETE FROM %s WHERE sess_id = ?",
$this->db->table_name('session')), $key);
}
return true;
}
/**
* Read session data from memcache
*
* @param string Session ID
* @return string Session vars
*/
public function mc_read($key)
{
if ($value = $this->memcache->get($key)) {
$arr = unserialize($value);
$this->changed = $arr['changed'];
$this->ip = $arr['ip'];
$this->vars = $arr['vars'];
$this->key = $key;
return !empty($this->vars) ? (string) $this->vars : '';
}
return null;
}
/**
* Save session data.
* handler for session_read()
*
* @param string Session ID
* @param string Serialized session vars
*
* @return boolean True on success
*/
public function mc_write($key, $vars)
{
$ts = microtime(true);
// no session data in cache (mc_read() returns false)
if (!$this->key)
$oldvars = null;
// use internal data for fast requests (up to 0.5 sec.)
else if ($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 !== null ? $this->_fixvars($vars, $oldvars) : $vars;
if ($newvars !== $oldvars || $ts - $this->changed > $this->lifetime / 3) {
return $this->memcache->set($key, serialize(array('changed' => time(), 'ip' => $this->ip, 'vars' => $newvars)),
MEMCACHE_COMPRESSED, $this->lifetime + 60);
}
return true;
}
/**
* Handler for session_destroy() with memcache backend
*
* @param string Session ID
*
* @return boolean True on success
*/
public function mc_destroy($key)
{
if ($key) {
// #1488592: use 2nd argument
$this->memcache->delete($key, 0);
}
return true;
}
/**
* Execute registered garbage collector routines
*/
public function gc($maxlifetime)
{
// move gc execution to the script shutdown function
// see rcube::shutdown() and rcube_session::write_close()
return $this->gc_enabled = $maxlifetime;
}
/**
* Register additional garbage collector functions
*
* @param mixed Callback function
*/
public function register_gc_handler($func)
{
foreach ($this->gc_handlers as $handler) {
if ($handler == $func) {
return;
}
}
$this->gc_handlers[] = $func;
}
/**
* Garbage collector handler to run on script shutdown
*/
protected function gc_shutdown()
{
if ($this->gc_enabled) {
// just delete all expired sessions
if ($this->storage == 'db') {
$this->db->query("DELETE FROM " . $this->db->table_name('session')
. " WHERE changed < " . $this->db->now(-$this->gc_enabled));
}
foreach ($this->gc_handlers as $fct) {
call_user_func($fct);
}
}
}
/**
* 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 = null;
$this->key = session_id();
return true;
}
/**
* Append the given value to the certain node in the session data array
*
* @param string Path denoting the session variable where to append the value
* @param string Key name under which to append the new value (use null for appending to an indexed list)
* @param mixed Value to append to the session data array
*/
public function append($path, $key, $value)
{
// re-read session data from DB because it might be outdated
if (!$this->reloaded && microtime(true) - $this->start > 0.5) {
$this->reload();
$this->reloaded = true;
$this->start = microtime(true);
}
$node = &$this->get_node(explode('.', $path), $_SESSION);
if ($key !== null) {
$node[$key] = $value;
$path .= '.' . $key;
}
else {
$node[] = $value;
}
$this->appends[] = $path;
// when overwriting a previously unset variable
if ($this->unsets[$path])
unset($this->unsets[$path]);
}
/**
* Unset a session variable
*
* @param string Variable name (can be a path denoting a certain node in the session array, e.g. compose.attachments.5)
* @return boolean True on success
*/
public function remove($var=null)
{
if (empty($var)) {
return $this->destroy(session_id());
}
$this->unsets[] = $var;
if (isset($_SESSION[$var])) {
unset($_SESSION[$var]);
}
else {
$path = explode('.', $var);
$key = array_pop($path);
$node = &$this->get_node($path, $_SESSION);
unset($node[$key]);
}
return true;
}
/**
* Kill this session
*/
public function kill()
{
$this->vars = null;
$this->ip = rcube_utils::remote_addr(); // update IP (might have changed)
$this->destroy(session_id());
rcube_utils::setcookie($this->cookiename, '-del-', time() - 60);
}
/**
* Re-read session data from storage backend
*/
public function reload()
{
// collect updated data from previous appends
$merge_data = array();
foreach ((array)$this->appends as $var) {
$path = explode('.', $var);
$value = $this->get_node($path, $_SESSION);
$k = array_pop($path);
$node = &$this->get_node($path, $merge_data);
$node[$k] = $value;
}
if ($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);
// apply appends and unsets to reloaded data
$_SESSION = array_merge_recursive($_SESSION, $merge_data);
foreach ((array)$this->unsets as $var) {
if (isset($_SESSION[$var])) {
unset($_SESSION[$var]);
}
else {
$path = explode('.', $var);
$k = array_pop($path);
$node = &$this->get_node($path, $_SESSION);
unset($node[$k]);
}
}
}
}
/**
* Returns a reference to the node in data array referenced by the given path.
* e.g. ['compose','attachments'] will return $_SESSION['compose']['attachments']
*/
private function &get_node($path, &$data_arr)
{
$node = &$data_arr;
if (!empty($path)) {
foreach ((array)$path as $key) {
if (!isset($node[$key]))
$node[$key] = array();
$node = &$node[$key];
}
}
return $node;
}
/**
* Serialize session data
*/
private function serialize($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++;
// increment pointer because of outer array
$serialized .= 'R:' . ($id + 1) . ';';
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));
}
/**
* 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 ? rcube_utils::remote_addr() == $this->ip : true;
if (!$result) {
$this->log("IP check failed for " . $this->key . "; expected " . $this->ip . "; got " . rcube_utils::remote_addr());
}
if ($result && $this->_mkcookie($this->now) != $this->cookie) {
$this->log("Session auth check failed for " . $this->key . "; timeslot = " . date('Y-m-d H:i:s', $this->now));
$result = false;
// Check if using id from a previous time slot
for ($i = 1; $i <= 2; $i++) {
$prev = $this->now - ($this->lifetime / 2) * $i;
if ($this->_mkcookie($prev) == $this->cookie) {
$this->log("Send new auth cookie for " . $this->key . ": " . $this->cookie);
$this->set_auth_cookie();
$result = true;
}
}
}
if (!$result) {
$this->log("Session authentication failed for " . $this->key
. "; invalid auth cookie sent; timeslot = " . date('Y-m-d H:i:s', $prev));
}
return $result;
}
/**
* Set session authentication cookie
*/
function set_auth_cookie()
{
$this->cookie = $this->_mkcookie($this->now);
rcube_utils::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));
}
/**
* Writes debug information to the log
*/
function log($line)
{
if ($this->logging) {
rcube::write_log('session', $line);
}
}
}
