I would like to setup a proxy like the ones that exist in hotels where you must have an account to access the internet. My requirements are:
1. You must have an account when on the network to access the internet.
2. Accounts should be able to be time limited. So, if Jake has two hours, and he logs in to access the internet, and two hours expires, he cannot log in again until the next day.
3. Linux based solutions are preferred.
4. Firewall or Proxy based solutions (so this works no matter what computer the user logs in from) are preferred.
What is out there?