[Zope] User Folder

hello and thanks for your help.. I did a plugin for PAS and iwant to read the users from de acl_users to validate and i did this: def authenticateCredentials(self, credentials): """ Authentication Part """ acl = self.getUserFolder() // Is this ok? login = credentials.get('login', '') password = credentials.get('password', '') if not acl or not login or not password: return (None, None) user = acl.getUser(login) if user is None: return (None, None) elif user and (user.getPassword() == password): return ( user.getId(), login ) return (None, None) But it don´t work. Can you help me??? how can i do it??