36

How can one prevent specific or any wine applications from accessing the internet?

When using certain applications under Windows, they were trying to access the internet from time to time without any obvious reason. I was able to prevent that behaviour with a personal firewall back then. Unfortunately I did not find an application level firewall in Ubuntu up to now. This is especially annoying when I am abroad using data-roaming with my 3G modem.

26

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.

  • 2
    Thank you, that's it! But I don't understand, why someone has voted you down. Your answer is exactly what I had hoped for. – YSN Dec 30 '10 at 22:03
  • It's a great answer if you follow the link, but I suspect the DV was because it is a mostly link answer. If you want the how, you have to go to the forums. That said, it got an upvote from me. – RobotHumans Dec 17 '15 at 4:40
  • 1
    To elaborate: to run a command under the new group use: sg no-internet -c "command args". Also note: apparently this iptable rule does not drop pings, so if you gonna test whether it's working, use netcat instead. EDIT: I also noted: it doesn't drop IPv6 connections, so you only have blocked UDP and TCP of IPv4. – Hi-Angel Jan 11 at 17:47
  • 1
    @Hi-Angel Probably should be the same args but with ip6tables. – Pablo Bianchi Jan 13 at 6:57
16

Make a group and become a member of it

addgroup wino

adduser $USER wino

Now enter an iptables rule to block that group from using the internet you can type this on the terminal and hit enter

iptables -A OUTPUT -m owner --gid-owner wino -j REJECT

To make this rule run after each reboot with systemd use iptables-persistent save from iptables-persistent package.

If using rc-local: You can put the rule in /etc/rc.local. Make sure the last line in that text file says exit 0.

Usage example:

sg wino "wine executablename.exe"

You need the " " and also type wine before the programs name.

  • 2
    I've edited your usermod command to add -a. Without -a, you will end up removing the user from all other supplementary groups (like admin, cdrom, etc.)! It is also more convenient to use addgroup/adduser. – gertvdijk Jul 14 '13 at 17:50
  • was just about to fix the -a myself. yes do not start wine as root !. only need root to make the iptables rule. the usage example was for normal user after doing those steps. – mark Jul 14 '13 at 17:52
  • ah sorry, my mistake. removed comment. – gertvdijk Jul 14 '13 at 17:53
  • @gertvdijk I edited the commands once more, adduser <username> <groupname> is the sensible thing here. – guntbert Jul 14 '13 at 17:58
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    is there any possibility to make it default that internet is blocked for that program (i.e. making the sg call obsolete, e.g. by chowning the program) ? – bonanza Sep 6 '15 at 13:13
7
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings]
"MigrateProxy"=dword:00000001
"ProxyEnable"=dword:00000001
"ProxyHttp.1.1"=dword:00000000
"ProxyOverride"="<local>"
"ProxyServer"="http://NonExistantProxyAddress:80"
"User Agent"="Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1"

to add to your wine (or playonlinux virtual drives) registry :

much simpler solution indeed than using groups (& does not prevent pol to connect, just the apps)

credits to http://ootput.wordpress.com/2011/06/06/block-wine-applications-from-the-internet/comment-page-1/

EDIT : waiting for the geek in the comment to add registry settings to block TCP, in the mean time : http://support.microsoft.com/en-us/kb/154596 (sounds like setting ports to zero or creating some config error will indeed block tcp/udp connections; but i haven't faced that issue quite yet, so i don't have the need for a work around)

  • 3
    this only blocks access for software which honors proxy settings, most dont obviously... so this is not a valid solution! – K1773R Mar 24 '15 at 8:35
  • like which one ? (all software i've been using with pol were blocked indeed). hence i'm not convinced by your statement : it is valid in many cases, might not be in some, but which one ? – mikakun Mar 25 '15 at 20:34
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    no its not. eg; any software that just connects to a host:port via TCP will continue to function. A HTTP proxy setting is something a program has to recognize and honor. If you dont believe me, get/compile software which connects to another host via TCP and see it for yourself. – K1773R Mar 26 '15 at 21:47

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