Ubuntu – How to restrict user’s access to the internet for time intervals

There's a nice tutorial on blocking any given program from accessing the Internet on the Ubuntu forums.

Steps

sudo addgroup no-internet  # Create group "no-internet"
sudo adduser $USER no-internet  # Add current user to no-internet

iptables rule to prevent that group from accessing the network

sudo iptables -I OUTPUT 1 -m owner --gid-owner no-internet -j DROP
sudo ip6tables -I OUTPUT 1 -m owner --gid-owner no-internet -j DROP # To also block IPv6 traffic

Process you don't want to have internet access using sg or sudo -g (execute command as different group ID):

sg no-internet -c "processFullPath args"

It basically involves creating a new group, denying it Internet access, and then running any program you want to restrict as that group ID. So in your case, you would just always run wine using the method described in the tutorial.

There is a Perl script in the German Ubuntu forum (Google-translated to English) that seems to do that. I never tried it and I didn't take a closer look at the script, but maybe it works for you. The description is in German only so you may need a translation service (like Google Translate; see above).