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<?php
/**
* HTTP Basic Authentication
*
* Make use of an existing HTTP authentication and perform login with the existing user credentials
*
* Configuration:
* // redirect the client to this URL after logout. This page is then responsible to clear HTTP auth
* $config['logout_url'] = 'http://server.tld/logout.html';
*
* See logout.html (in this directory) for an example how HTTP auth can be cleared.
*
* For other configuration options, see config.inc.php.dist!
*
* @license GNU GPLv3+
* @author Thomas Bruederli
*/
class http_authentication extends rcube_plugin
{
private $redirect_query;
function init()
{
$this->add_hook('startup', [$this, 'startup']);
$this->add_hook('authenticate', [$this, 'authenticate']);
$this->add_hook('logout_after', [$this, 'logout']);
$this->add_hook('login_after', [$this, 'login']);
}
function startup($args)
{
if (!empty($_SERVER['PHP_AUTH_USER'])) {
$rcmail = rcmail::get_instance();
$rcmail->add_shutdown_function(['http_authentication', 'shutdown']);
// handle login action
if (empty($_SESSION['user_id'])) {
$args['action'] = 'login';
$this->redirect_query = $_SERVER['QUERY_STRING'];
}
// Set user password in session (see shutdown() method for more info)
else if (!empty($_SESSION['user_id']) && empty($_SESSION['password'])
&& !empty($_SERVER['PHP_AUTH_PW'])
) {
$_SESSION['password'] = $rcmail->encrypt($_SERVER['PHP_AUTH_PW']);
}
}
return $args;
}
function authenticate($args)
{
// Load plugin's config file
$this->load_config();
$host = rcmail::get_instance()->config->get('http_authentication_host');
if (is_string($host) && trim($host) !== '' && empty($args['host'])) {
$args['host'] = rcube_utils::idn_to_ascii(rcube_utils::parse_host($host));
}
// Allow entering other user data in login form,
// e.g. after log out (#1487953)
if (!empty($args['user'])) {
return $args;
}
if (!empty($_SERVER['PHP_AUTH_USER'])) {
$args['user'] = $_SERVER['PHP_AUTH_USER'];
if (!empty($_SERVER['PHP_AUTH_PW'])) {
$args['pass'] = $_SERVER['PHP_AUTH_PW'];
}
}
$args['cookiecheck'] = false;
$args['valid'] = true;
return $args;
}
function logout($args)
{
// redirect to configured URL in order to clear HTTP auth credentials
if (!empty($_SERVER['PHP_AUTH_USER']) && $args['user'] == $_SERVER['PHP_AUTH_USER']) {
if ($url = rcmail::get_instance()->config->get('logout_url')) {
header("Location: $url", true, 307);
exit;
}
}
}
static function shutdown()
{
// There's no need to store password (even if encrypted) in session
// We'll set it back on startup (#1486553)
rcmail::get_instance()->session->remove('password');
}
function login($args)
{
// Redirect to the previous QUERY_STRING
if ($this->redirect_query) {
header('Location: ./?' . $this->redirect_query);
exit;
}
return $args;
}
}
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