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I am using Red Hat 9. I would like to create a user group on my computer that would have no access to the Internet. I would like all other user groups to continue to be able to access the Internet. How would I set this up?
i dont know how redhat configures firewalls but according to my iptables man page there is a module called owner which can match packets on uid, gid, and pid. which is what you want but it is labelled experimental so i cant guarantee it working.
assuming everythings set up in your kernel and your iptables supports this module then something along the lines of
iptables -A OUTPUT -m owner --gid-owner [insert group id] -j DROP
will drop all packets coming from programs running with that group id. but as i know nothing about redhat i cant give you anything more specific.