MAC address authentication

Hi All; I am trying to make an authentication server. We are a campus that requires a MAC address in a database to use the web. Is there a way so that when a new computer is added to our network that they can be sent to a web page that grabs the MAC address (got this one with PHP) They have to put in there Name and Room Number (PHP, MYSQL) and saves it to a data base. Once they have done this it gives them access to the internet. Via proxy or something like this? Then every time afterwards it lets them go out because it knows the MAC address. Is there something that is created like this already? Neal Haas Fresno Pacific University (559)453-2101