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<?php
/**
* Kerberos Authentication
*
* Make use of an existing Kerberos authentication and perform login
* with the existing user credentials
*
* For other configuration options, see config.inc.php.dist!
*
* @license GNU GPLv3+
* @author Jeroen van Meeuwen
*/
class krb_authentication extends rcube_plugin
{
private $redirect_query;
/**
* Plugin initialization
*/
function init()
{
$this->add_hook('startup', [$this, 'startup']);
$this->add_hook('authenticate', [$this, 'authenticate']);
$this->add_hook('login_after', [$this, 'login']);
$this->add_hook('storage_connect', [$this, 'storage_connect']);
$this->add_hook('managesieve_connect', [$this, 'managesieve_connect']);
$this->add_hook('smtp_connect', [$this, 'smtp_connect']);
}
/**
* Startup hook handler
*/
function startup($args)
{
if (!empty($_SERVER['REMOTE_USER']) && !empty($_SERVER['KRB5CCNAME'])) {
// handle login action
if (empty($_SESSION['user_id'])) {
$args['action'] = 'login';
$this->redirect_query = $_SERVER['QUERY_STRING'];
}
else {
$_SESSION['password'] = null;
}
}
return $args;
}
/**
* Authenticate hook handler
*/
function authenticate($args)
{
if (!empty($_SERVER['REMOTE_USER']) && !empty($_SERVER['KRB5CCNAME'])) {
// Load plugin's config file
$this->load_config();
$rcmail = rcmail::get_instance();
$host = $rcmail->config->get('krb_authentication_host');
if (is_string($host) && trim($host) !== '' && empty($args['host'])) {
$args['host'] = rcube_utils::idn_to_ascii(rcube_utils::parse_host($host));
}
if (!empty($_SERVER['REMOTE_USER'])) {
$args['user'] = $_SERVER['REMOTE_USER'];
$args['pass'] = null;
}
$args['cookiecheck'] = false;
$args['valid'] = true;
}
return $args;
}
/**
* login_after hook handler
*/
function login($args)
{
// Redirect to the previous QUERY_STRING
if ($this->redirect_query) {
header('Location: ./?' . $this->redirect_query);
exit;
}
return $args;
}
/**
* Storage_connect hook handler
*/
function storage_connect($args)
{
if (!empty($_SERVER['REMOTE_USER']) && !empty($_SERVER['KRB5CCNAME'])) {
$args['gssapi_context'] = $this->gssapi_context('imap');
$args['gssapi_cn'] = $_SERVER['KRB5CCNAME'];
$args['auth_type'] = 'GSSAPI';
}
return $args;
}
/**
* managesieve_connect hook handler
*/
function managesieve_connect($args)
{
if (
(!isset($args['auth_type']) || $args['auth_type'] == 'GSSAPI')
&& !empty($_SERVER['REMOTE_USER']) && !empty($_SERVER['KRB5CCNAME'])
) {
$args['gssapi_context'] = $this->gssapi_context('sieve');
$args['gssapi_cn'] = $_SERVER['KRB5CCNAME'];
$args['auth_type'] = 'GSSAPI';
}
return $args;
}
/**
* smtp_connect hook handler
*/
function smtp_connect($args)
{
if (
(!isset($args['smtp_auth_type']) || $args['smtp_auth_type'] == 'GSSAPI')
&& !empty($_SERVER['REMOTE_USER']) && !empty($_SERVER['KRB5CCNAME'])
) {
$args['gssapi_context'] = $this->gssapi_context('smtp');
$args['gssapi_cn'] = $_SERVER['KRB5CCNAME'];
$args['smtp_auth_type'] = 'GSSAPI';
}
return $args;
}
/**
* Returns configured GSSAPI context string
*/
private function gssapi_context($protocol)
{
// Load plugin's config file
$this->load_config();
$rcmail = rcmail::get_instance();
$context = $rcmail->config->get('krb_authentication_context');
if (is_array($context) && isset($context[$protocol])) {
$context = $context[$protocol];
}
if (empty($context)) {
rcube::raise_error("Empty GSSAPI context ($protocol).", true);
}
return $context;
}
}
|
