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<?php
namespace Zotlabs\Web;
/**
*
* @brief This file includes session related functions.
*
* Session management functions. These provide database storage of PHP
* session info.
*/
class Session {
private static $handler = null;
private static $session_started = false;
static public function init() {
$gc_probability = 50;
ini_set('session.gc_probability', $gc_probability);
ini_set('session.use_only_cookies', 1);
ini_set('session.cookie_httponly', 1);
/*
* Set our session storage functions.
*/
$handler = new \Zotlabs\Web\SessionHandler();
self::$handler = $handler;
$x = session_set_save_handler($handler,false);
if(! $x)
logger('Session save handler initialisation failed.',LOGGER_NORMAL,LOG_ERR);
// Force cookies to be secure (https only) if this site is SSL enabled.
// Must be done before session_start().
$arr = session_get_cookie_params();
session_set_cookie_params(
((isset($arr['lifetime'])) ? $arr['lifetime'] : 0),
((isset($arr['path'])) ? $arr['path'] : '/'),
((isset($arr['domain'])) ? $arr['domain'] : App::get_hostname()),
((isset($_SERVER['HTTPS']) && strtolower($_SERVER['HTTPS']) == 'on') ? true : false),
((isset($arr['httponly'])) ? $arr['httponly'] : true)
);
register_shutdown_function('session_write_close');
}
static public function start() {
session_start();
self::$session_started = true;
}
/**
* @brief Resets the current session.
*
* @return void
*/
static public function nuke() {
self::new_cookie(0); // 0 means delete on browser exit
if($_SESSION && count($_SESSION)) {
foreach($_SESSION as $k => $v) {
unset($_SESSION[$k]);
}
}
}
static public function new_cookie($xtime) {
$newxtime = (($xtime> 0) ? (time() + $xtime) : 0);
$old_sid = session_id();
if(self::$handler && self::$session_started) {
session_regenerate_id(true);
// force SessionHandler record creation with the new session_id
// which occurs as a side effect of read()
self::$handler->read(session_id());
}
else
logger('no session handler');
if (x($_COOKIE, 'jsdisabled')) {
setcookie('jsdisabled', $_COOKIE['jsdisabled'], $newxtime);
}
setcookie(session_name(),session_id(),$newxtime);
$arr = array('expire' => $xtime);
call_hooks('new_cookie', $arr);
}
static public function extend_cookie() {
// if there's a long-term cookie, extend it
$xtime = (($_SESSION['remember_me']) ? (60 * 60 * 24 * 365) : 0 );
if($xtime)
setcookie(session_name(),session_id(),(time() + $xtime));
$arr = array('expire' => $xtime);
call_hooks('extend_cookie', $arr);
}
static public function return_check() {
// check a returning visitor against IP changes.
// If the change results in being blocked from re-entry with the current cookie
// nuke the session and logout.
// Returning at all indicates the session is still valid.
// first check if we're enforcing that sessions can't change IP address
// @todo what to do with IPv6 addresses
if($_SESSION['addr'] && $_SESSION['addr'] != $_SERVER['REMOTE_ADDR']) {
logger('SECURITY: Session IP address changed: ' . $_SESSION['addr'] . ' != ' . $_SERVER['REMOTE_ADDR']);
$partial1 = substr($_SESSION['addr'], 0, strrpos($_SESSION['addr'], '.'));
$partial2 = substr($_SERVER['REMOTE_ADDR'], 0, strrpos($_SERVER['REMOTE_ADDR'], '.'));
$paranoia = intval(get_pconfig($_SESSION['uid'], 'system', 'paranoia'));
if(! $paranoia)
$paranoia = intval(get_config('system', 'paranoia'));
switch($paranoia) {
case 0:
// no IP checking
break;
case 2:
// check 2 octets
$partial1 = substr($partial1, 0, strrpos($partial1, '.'));
$partial2 = substr($partial2, 0, strrpos($partial2, '.'));
if($partial1 == $partial2)
break;
case 1:
// check 3 octets
if($partial1 == $partial2)
break;
case 3:
default:
// check any difference at all
logger('Session address changed. Paranoid setting in effect, blocking session. '
. $_SESSION['addr'] . ' != ' . $_SERVER['REMOTE_ADDR']);
self::nuke();
goaway(z_root());
break;
}
}
return true;
}
}
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