Friendica Communications Platform (please note that this is a clone of the repository at github, issues are handled there) https://friendi.ca
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<?php
require_once('include/security.php');
require_once('include/datetime.php');
// When the "Friendica" cookie is set, take the value to authenticate and renew the cookie.
if (isset($_COOKIE["Friendica"])) {
$data = json_decode($_COOKIE["Friendica"]);
if (isset($data->uid)) {
$r = q("SELECT `user`.*, `user`.`pubkey` as `upubkey`, `user`.`prvkey` as `uprvkey`
FROM `user` WHERE `uid` = %d AND NOT `blocked` AND NOT `account_expired` AND NOT `account_removed` AND `verified` LIMIT 1",
intval($data->uid)
);
if ($r) {
if ($data->hash != cookie_hash($r[0])) {
logger("Hash for user ".$data->uid." doesn't fit.");
nuke_session();
goaway(z_root());
}
// Renew the cookie
new_cookie(604800, $r[0]);
// Do the authentification if not done by now
if (!isset($_SESSION) OR !isset($_SESSION['authenticated'])) {
authenticate_success($r[0]);
if (get_config('system','paranoia'))
$_SESSION['addr'] = $data->ip;
}
}
}
}
// login/logout
if (isset($_SESSION) && x($_SESSION,'authenticated') && (!x($_POST,'auth-params') || ($_POST['auth-params'] !== 'login'))) {
if ((x($_POST,'auth-params') && ($_POST['auth-params'] === 'logout')) || ($a->module === 'logout')) {
// process logout request
call_hooks("logging_out");
nuke_session();
info(t('Logged out.').EOL);
goaway(z_root());
}
if (x($_SESSION,'visitor_id') && !x($_SESSION,'uid')) {
$r = q("SELECT * FROM `contact` WHERE `id` = %d LIMIT 1",
intval($_SESSION['visitor_id'])
);
if (dbm::is_result($r)) {
$a->contact = $r[0];
}
}
if (x($_SESSION,'uid')) {
// already logged in user returning
$check = get_config('system','paranoia');
// extra paranoia - if the IP changed, log them out
if ($check && ($_SESSION['addr'] != $_SERVER['REMOTE_ADDR'])) {
logger('Session address changed. Paranoid setting in effect, blocking session. '.
$_SESSION['addr'].' != '.$_SERVER['REMOTE_ADDR']);
nuke_session();
goaway(z_root());
}
$r = q("SELECT `user`.*, `user`.`pubkey` as `upubkey`, `user`.`prvkey` as `uprvkey`
FROM `user` WHERE `uid` = %d AND NOT `blocked` AND NOT `account_expired` AND NOT `account_removed` AND `verified` LIMIT 1",
intval($_SESSION['uid'])
);
if (!dbm::is_result($r)) {
nuke_session();
goaway(z_root());
}
// Make sure to refresh the last login time for the user if the user
// stays logged in for a long time, e.g. with "Remember Me"
$login_refresh = false;
if (!x($_SESSION['last_login_date'])) {
$_SESSION['last_login_date'] = datetime_convert('UTC','UTC');
}
if (strcmp(datetime_convert('UTC','UTC','now - 12 hours'), $_SESSION['last_login_date']) > 0) {
$_SESSION['last_login_date'] = datetime_convert('UTC','UTC');
$login_refresh = true;
}
authenticate_success($r[0], false, false, $login_refresh);
}
} else {
session_unset();
if (x($_POST,'password') && strlen($_POST['password']))
$encrypted = hash('whirlpool',trim($_POST['password']));
else {
if ((x($_POST,'openid_url')) && strlen($_POST['openid_url']) ||
(x($_POST,'username')) && strlen($_POST['username'])) {
$noid = get_config('system','no_openid');
$openid_url = trim((strlen($_POST['openid_url'])?$_POST['openid_url']:$_POST['username']));
// validate_url alters the calling parameter
$temp_string = $openid_url;
// if it's an email address or doesn't resolve to a URL, fail.
if ($noid || strpos($temp_string,'@') || !validate_url($temp_string)) {
$a = get_app();
notice(t('Login failed.').EOL);
goaway(z_root());
// NOTREACHED
}
// Otherwise it's probably an openid.
try {
require_once('library/openid.php');
$openid = new LightOpenID;
$openid->identity = $openid_url;
$_SESSION['openid'] = $openid_url;
$openid->returnUrl = App::get_baseurl(true).'/openid';
goaway($openid->authUrl());
} catch (Exception $e) {
notice(t('We encountered a problem while logging in with the OpenID you provided. Please check the correct spelling of the ID.').'<br /><br >'.t('The error message was:').' '.$e->getMessage());
}
// NOTREACHED
}
}
if (x($_POST,'auth-params') && $_POST['auth-params'] === 'login') {
$record = null;
$addon_auth = array(
'username' => trim($_POST['username']),
'password' => trim($_POST['password']),
'authenticated' => 0,
'user_record' => null
);
/**
*
* A plugin indicates successful login by setting 'authenticated' to non-zero value and returning a user record
* Plugins should never set 'authenticated' except to indicate success - as hooks may be chained
* and later plugins should not interfere with an earlier one that succeeded.
*
*/
call_hooks('authenticate', $addon_auth);
if ($addon_auth['authenticated'] && count($addon_auth['user_record']))
$record = $addon_auth['user_record'];
else {
// process normal login request
$r = q("SELECT `user`.*, `user`.`pubkey` as `upubkey`, `user`.`prvkey` as `uprvkey`
FROM `user` WHERE (`email` = '%s' OR `nickname` = '%s')
AND `password` = '%s' AND NOT `blocked` AND NOT `account_expired` AND NOT `account_removed` AND `verified` LIMIT 1",
dbesc(trim($_POST['username'])),
dbesc(trim($_POST['username'])),
dbesc($encrypted)
);
if (dbm::is_result($r))
$record = $r[0];
}
if (!$record || !count($record)) {
logger('authenticate: failed login attempt: '.notags(trim($_POST['username'])).' from IP '.$_SERVER['REMOTE_ADDR']);
notice(t('Login failed.').EOL);
goaway(z_root());
}
// If the user specified to remember the authentication, then set a cookie
// that expires after one week (the default is when the browser is closed).
// The cookie will be renewed automatically.
// The week ensures that sessions will expire after some inactivity.
if ($_POST['remember'])
new_cookie(604800, $r[0]);
else
new_cookie(0); // 0 means delete on browser exit
// if we haven't failed up this point, log them in.
$_SESSION['last_login_date'] = datetime_convert('UTC','UTC');
authenticate_success($record, true, true);
}
}
/**
* @brief Kills the "Friendica" cookie and all session data
*/
function nuke_session() {
new_cookie(-3600); // make sure cookie is deleted on browser close, as a security measure
session_unset();
session_destroy();
}
/**
* @brief Calculate the hash that is needed for the "Friendica" cookie
*
* @param array $user Record from "user" table
*
* @return string Hashed data
*/
function cookie_hash($user) {
return(hash("sha256", get_config("system", "site_prvkey").
$user["uprvkey"].
$user["password"]));
}
/**
* @brief Set the "Friendica" cookie
*
* @param int $time
* @param array $user Record from "user" table
*/
function new_cookie($time, $user = array()) {
if ($time != 0)
$time = $time + time();
if ($user)
$value = json_encode(array("uid" => $user["uid"],
"hash" => cookie_hash($user),
"ip" => $_SERVER['REMOTE_ADDR']));
else
$value = "";
setcookie("Friendica", $value, $time, "/", "",
(get_config('system', 'ssl_policy') == SSL_POLICY_FULL), true);
}