Firewalls acting as access controllers

[Green Horn <teachgreenhorn () yahoo com>]

Hi,
 I am new to firewalls. 
Do firewalls provide dynamically defined access
control  i.e., can they act as access controllers.
e.g., it should be able to do the following, a user
tries to access a resource, the packets would come to
the firewall, if they are HTTP packets and the user is
new (from IP address not being in the authenticated
list), the packets would be redirected to a webproxy,
the webproxy tries to get the user authenticated by a
AAA server (say RADIUS), the firewall would get an
authorization message from the AAA server (or
webproxy), saying the time the user must be allowed
access, the resources he can access etc.
The firewall would provide that access.

Can this be done by the firewalls in the market such
as Checkpoint firewall-1

        greenhorn.


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