1. Implement a proxied service: samba
CAS/Client.php
2. add:    public function serviceSamba($serviceUrl, &$err_code)
3. modify:	public function getProxiedService ($type)
4. modify: private function getCallbackURL()
4. modify: public function getURL()

CAS.php
6. add define("PHPCAS_PROXIED_SERVICE_IMAP", 'CAS_ProxiedService_Samba');
5. add public static function serviceSMB($url, $err_code)