Authorization information to Firewall

Hi, I am new to firewalls. Are firewalls usually compliant with AAA servers (say RADIUS), if not, is there other way for the firewalls to get authorization information regarding letting an user traffic out/in (e.g., how much time, etc). I am curious on how the web-based login system in hotspots works. The user logs in to the web proxy. If the user is authentic, the firewall should open up for this user (IP address). Is the web proxy part of the firewall itself here, if so, can someone tell me a few such product names. If the web proxy is a different element, the firewall should recieve some authorization information on how much time the user traffic should be allowed, wat is the standard protocol used for this.


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