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<?php
/**
* Elgg session management
* Functions to manage logins
*
* @package Elgg
* @subpackage Core
* @license http://www.gnu.org/licenses/old-licenses/gpl-2.0.html GNU Public License version 2
* @author Curverider Ltd
* @copyright Curverider Ltd 2008
* @link http://elgg.org/
*/
/**
* Returns whether or not the user is currently logged in
*
* @uses $_SESSION
* @return true|false
*/
function isloggedin() {
if (!is_installed()) return false;
if ((isset($_SESSION['guid'])) && ($_SESSION['guid'] > 0) && (isset($_SESSION['id'])) && ($_SESSION['id'] > 0) )
return true;
return false;
}
/**
* Returns whether or not the user is currently logged in and that they are an admin user.
*
* @uses $_SESSION
* @uses isloggedin()
* @return true|false
*/
function isadminloggedin()
{
if ((isloggedin()) && (($_SESSION['user']->admin || $_SESSION['user']->siteadmin)))
return true;
return false;
}
/**
* Perform standard authentication with a given username and password.
* Returns an ElggUser object for use with login.
*
* @see login
* @param string $username The username, optionally (for standard logins)
* @param string $password The password, optionally (for standard logins)
* @return ElggUser|false The authenticated user object, or false on failure.
*/
function authenticate($username, $password) {
if (pam_authenticate(array('username' => $username, 'password' => $password)))
return get_user_by_username($username);
return false;
}
/**
* Hook into the PAM system which accepts a username and password and attempts to authenticate
* it against a known user.
*
* @param array $credentials Associated array of credentials passed to pam_authenticate. This function expects
* 'username' and 'password' (cleartext).
*/
function pam_auth_userpass($credentials = NULL)
{
if (is_array($credentials) && ($credentials['username']) && ($credentials['password']))
{
//$dbpassword = md5($credentials['password']);
if ($user = get_user_by_username($credentials['username'])) {
// Let admins log in without validating their email, but normal users must have validated their email
if ((!$user->admin) && (!$user->validated_email) && (!$user->admin_created))
return false;
if ($user->password == generate_user_password($user, $credentials['password'])) {
return true;
}
}
}
return false;
}
/**
* Logs in a specified ElggUser. For standard registration, use in conjunction
* with authenticate.
*
* @see authenticate
* @param ElggUser $user A valid Elgg user object
* @param boolean $persistent Should this be a persistent login?
* @return true|false Whether login was successful
*/
function login(ElggUser $user, $persistent = false) {
global $CONFIG;
$_SESSION['user'] = $user;
$_SESSION['guid'] = $user->getGUID();
$_SESSION['id'] = $_SESSION['guid'];
$_SESSION['username'] = $user->username;
$_SESSION['name'] = $user->name;
$code = (md5($user->name . $user->username . time() . rand()));
$user->code = md5($code);
$_SESSION['code'] = $code;
if (($persistent))
setcookie("elggperm", $code, (time()+(86400 * 30)),"/");
if (!$user->save() || !trigger_elgg_event('login','user',$user)) {
unset($_SESSION['username']);
unset($_SESSION['name']);
unset($_SESSION['code']);
unset($_SESSION['guid']);
unset($_SESSION['id']);
unset($_SESSION['user']);
setcookie("elggperm", "", (time()-(86400 * 30)),"/");
return false;
}
// Users privilege has been elevated, so change the session id (help prevent session hijacking)
session_regenerate_id();
return true;
}
/**
* Log the current user out
*
* @return true|false
*/
function logout() {
global $CONFIG;
if (isset($_SESSION['user'])) {
if (!trigger_elgg_event('logout','user',$_SESSION['user'])) return false;
$_SESSION['user']->code = "";
$_SESSION['user']->save();
}
unset($_SESSION['username']);
unset($_SESSION['name']);
unset($_SESSION['code']);
unset($_SESSION['guid']);
unset($_SESSION['id']);
unset($_SESSION['user']);
setcookie("elggperm", "", (time()-(86400 * 30)),"/");
session_destroy();
return true;
}
function get_session_fingerprint()
{
global $CONFIG;
return md5($_SERVER['HTTP_USER_AGENT'] );
}
/**
* Initialises the system session and potentially logs the user in
*
* This function looks for:
*
* 1. $_SESSION['id'] - if not present, we're logged out, and this is set to 0
* 2. The cookie 'elggperm' - if present, checks it for an authentication token, validates it, and potentially logs the user in
*
* @uses $_SESSION
* @param unknown_type $event
* @param unknown_type $object_type
* @param unknown_type $object
*/
function session_init($event, $object_type, $object) {
if (!is_db_installed()) return false;
session_name('Elgg');
session_start();
// Do some sanity checking by generating a fingerprint (makes some XSS attacks harder)
if (isset($_SESSION['__elgg_fingerprint']))
{
if ($_SESSION['__elgg_fingerprint'] != get_session_fingerprint())
{
session_destroy();
return false;
}
}
else
{
$_SESSION['__elgg_fingerprint'] = get_session_fingerprint();
}
// Generate a simple token
if (!isset($_SESSION['__elgg_session'])) $_SESSION['__elgg_session'] = md5(microtime().rand());
if (empty($_SESSION['guid'])) {
if (isset($_COOKIE['elggperm'])) {
$code = $_COOKIE['elggperm'];
$code = md5($code);
$_SESSION['guid'] = 0;
$_SESSION['id'] = 0;
// $_SESSION['user'] = new ElggDummy();
if ($user = get_user_by_code($code)) {
$_SESSION['user'] = $user;
$_SESSION['id'] = $user->getGUID();
$_SESSION['guid'] = $_SESSION['id'];
$_SESSION['code'] = $_COOKIE['elggperm'];
}
} else {
//$_SESSION['user'] = new ElggDummy();
$_SESSION['id'] = 0;
$_SESSION['guid'] = 0;
$_SESSION['code'] = "";
}
} else {
if (!empty($_SESSION['code'])) {
$code = md5($_SESSION['code']);
if ($user = get_user_by_code($code)) {
$_SESSION['user'] = $user;
$_SESSION['id'] = $user->getGUID();
$_SESSION['guid'] = $_SESSION['id'];
} else {
unset($_SESSION['user']);
// $_SESSION['user'] = new ElggDummy();
$_SESSION['guid'] = 0;
$_SESSION['id'] = 0;
$_SESSION['code'] = "";
}
} else {
//$_SESSION['user'] = new ElggDummy();
$_SESSION['guid'] = 0;
$_SESSION['id'] = 0;
$_SESSION['code'] = "";
}
}
if ($_SESSION['id'] > 0) {
set_last_action($_SESSION['id']);
}
register_action("login",true);
register_action("logout");
// Register a default PAM handler
register_pam_handler('pam_auth_userpass');
return true;
}
/**
* Used at the top of a page to mark it as logged in users only.
*
*/
function gatekeeper() {
if (!isloggedin()) {
$_SESSION['last_forward_from'] = current_page_url();
forward();
}
}
/**
* Used at the top of a page to mark it as logged in admin or siteadmin only.
*
*/
function admin_gatekeeper()
{
gatekeeper();
if (!$_SESSION['user']->admin && !$_SESSION['user']->siteadmin) {
$_SESSION['last_forward_from'] = current_page_url();
forward();
}
}
register_elgg_event_handler("boot","system","session_init",1);
?>
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