This sounds a lot like 802.1x authentication. There is an open 802.1x at http://www.open1x.org/. If authentication is all at that you need. Try redirecting traffic to squid /w the squidguard module and make a captive portal situation. If you have any other questions dont hesitate to ask. The functionality is very simular to hotspot controllers in authenticating wireless internet traffic. Jeremy Davis Slice Networks
