Restricting Internet access


I was curious on how you could limit users surfing the Internet, I found KobrAs's guide useful  :D
I setup a group called Internet and assigned users to it and apply this to my iptable

iptables -t filter -A OUTPUT -p tcp -dport 80 --match owner --gid-owner 501 -j DROP

This worked great, but I was wondering if you had your users logging in all over your network
using LDAP, How could you make these rules apply still?
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If You mean, that user has it's own machine, and authenticates via LDAP on Your server, then the answer is, You can't apply this in the way shown above.

In such case, You can DROP/REJECT packets on FORWARD chain depending on machine the packet arrive from (IP, MAC, and so on.)

But, You can force all Your users to access internet only via proxy (a squid proxy) with proxy authentication. Then You would be able to give a user selectible access to web(user can access this webpage, but can't the another).

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