user without profile in database

Hello Is there a way to auth user with bad password, or user that doesn't exists in database?? What I need? Let's say we have a 'userX' with password 'userXpassword' and that user try to log in to service, but he try to use wrong password, I want to auth him anyway but when he log in I will give him ip addres that have can contact only with a web where will be a message that will tell him that he use the wrong password, o second example there is a client that haven't got a profile in database and he want to log in to service using username and password that he create I want to auth him anyway and give him address and then redirect all traffic from him to web with message. Thanks!!