PIX ACL user downloadable issues

Recently, I opened a TAC case on an issue that I had with user downloadable ACLs on a radius server. I use the user acl on an intranet pix firewall that protects some servers. We have programmers who need special access for them and tried to have the ACL of assigned dynamically. It turns out that TAC said even if I had the correct ACL and they were applied to the user, I must have the same ACL allowing traffic on the interface which runs incoming traffic. There is no sense to me due to the fact that my goal was to get rid of permanent acl and not have to worry about the use of IP source addresses. I could have just the connection of the user through http and it gets the acl. Then finally the active uauth timer and removes the ACL so do not leave a hole on the PIX. I totally miss the downloadable ACLs goal, so if someone could shed some light on the subject I would appreciate it :) I have that someone has a solution or another solution to the problem that I have please do not hesitate to post! Thanks advance!

Tony

For authentication and ACL downloadable works, you need two ACLs on the PIX, the ACL interface and authentication ACL. You can consider the ACL interface as a trigger for the ACL authentication should it allow traffic through to trigger authentication. It must also allow the same traffic that the auth acl which means it is sometimes easier to make more restrictive the more permissive acl interface and the auth acl.

for example if you have users on 192.168.1.0 24 inside interface and you want to authenticate you to access Terminal Server services, you can if you want to configure the inside access list to allow all traffic to 192.168.1.0/24

! inside the 192.168.1.0 auth trigger

permit 192.168.1.0 ip access list inside_access_in 255.255.255.0 any

but deny all in the acl of authentication, which means that all traffic required authentication/authorization first.

! authentication for 192.168.1.0

! don't authenticate DNS and ICMP

inside_authentication list access deny udp 192.168.1.0 255.255.255.0 any eq 53

inside_authentication list access deny icmp 192.168.1.0 255.255.255.0 any

! authenticate everything.

permit 192.168.1.0 ip access list inside_authentication 255.255.255.0

! apply access lists

inside_access_in access to the interface inside group

AAA game inside_authentication inside RADIUS authentication

Your ACL ACS/RADIUS would be configured to

! term serv

permit tcp 192.168.1.0 255.255.255.0 any eq 3389

! http

permit tcp 192.168.1.0 255.255.255.0 any eq 80

That would provide the term serv and http access to an authenticated user. Your logs show permission denied for all other access to this user after authentication.

I hope this helps.

Tags: Cisco Security

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