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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 $handler = null;
private $session_started = false;
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();
$this->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'])) ? $arr['path'] : '/'),
(($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');
}
public function start() {
session_start();
$this->session_started = true;
}
/**
* @brief Resets the current session.
*
* @return void
*/
public function nuke() {
$this->new_cookie(0); // 0 means delete on browser exit
if($_SESSION && count($_SESSION)) {
foreach($_SESSION as $k => $v) {
unset($_SESSION[$k]);
}
}
}
public function new_cookie($xtime) {
$newxtime = (($xtime> 0) ? (time() + $xtime) : 0);
$old_sid = session_id();
$arr = session_get_cookie_params();
if($this->handler && $this->session_started) {
// The session should be regenerated to prevent session fixation attacks.
// Traditionally this has been working well, but stopped working in Firefox
// recently (~46.0). It works well in other browsers. FF takes time for the
// new cookie to propagate and it appears to still use the old cookie for the
// next several requests. We don't have an easy way to flush the cookies and
// ensure the browser is using the right one. I've tried several methods including
// delayed cookie deletion and issuing a page reload just after authentication
// and none have been successful and all are hacks to work around what looks to be
// a browser issue. This is an important @FIXME. We should enable by default and let
// folks disable it if they have issues, except they can't login to change it if
// their sessions aren't working.
// session_regenerate_id(true);
// force SessionHandler record creation with the new session_id
// which occurs as a side effect of read()
$this->handler->read(session_id());
}
else
logger('no session handler');
if (x($_COOKIE, 'jsdisabled')) {
setcookie('jsdisabled', $_COOKIE['jsdisabled'], $newxtime, '/', \App::get_hostname(),((isset($_SERVER['HTTPS']) && strtolower($_SERVER['HTTPS']) == 'on') ? true : false),((isset($arr['httponly'])) ? $arr['httponly'] : true));
}
setcookie(session_name(),session_id(),$newxtime, '/', \App::get_hostname(),((isset($_SERVER['HTTPS']) && strtolower($_SERVER['HTTPS']) == 'on') ? true : false),((isset($arr['httponly'])) ? $arr['httponly'] : true));
$arr = array('expire' => $xtime);
call_hooks('new_cookie', $arr);
}
public function extend_cookie() {
$arr = session_get_cookie_params();
// 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() + $xtime), '/', \App::get_hostname(),((isset($_SERVER['HTTPS']) && strtolower($_SERVER['HTTPS']) == 'on') ? true : false),((isset($arr['httponly'])) ? $arr['httponly'] : true));
$arr = array('expire' => $xtime);
call_hooks('extend_cookie', $arr);
}
public function return_check() {
// check a returning visitor against IP changes.
// If the change results in being blocked from re-entry with the current cookie
// nuke the session and logout.
// Returning at all indicates the session is still valid.
// first check if we're enforcing that sessions can't change IP address
// @todo what to do with IPv6 addresses
if($_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']);
$this->nuke();
goaway(z_root());
break;
}
}
return true;
}
}
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