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sharing my simple wireguard kill-switch for Linux (lemmings.world)

submitted 6 months ago by xabadak@lemmings.world to c/privacy@lemmy.ml

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cross-posted from: https://lemmings.world/post/8926396

In light of the recent TunnelVision vulnerability I wanted to share a simple firewall that I wrote for wireguard VPNs.

https://codeberg.org/xabadak/wg-lockdown

If you use a fancy official VPN client from Mullvad, PIA, etc, you won't need this since most clients already have a kill switch built in (also called Lockdown Mode in Mullvad). This is if you use a barebones wireguard VPN like me, or if your VPN client has a poorly-designed kill switch (like NordVPN, more info here).

A firewall should mitigate the vulnerability, though it does create a side-channel that can be exploited in extremely unlikely circumstances, so a better solution would be to use network namespaces (more info here). Unfortunately I'm a noob and I couldn't find any scripts or tools to do it that way.

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[–] xabadak@lemmings.world 2 points 6 months ago* (last edited 6 months ago) (1 children)

How do you route all a host system's traffic through Gluetun? If you use routing tables, wouldn't it similarly be affected by TunnelVision? In which case you would still need a firewall on the host...

Also, the host system likely makes network requests right after boot, before a Gluetun container has time to start. How do you make sure those don't leak?

I am curious though, how you were able to route all host traffic through Gluetun. I know it can be used as a http/socks proxy, but I only know of ways to configure your browser to use that. What about other applications and system-level services? What about other kinds of traffic, like ssh?

[–] MalReynolds@slrpnk.net 1 points 6 months ago (1 children)

I don't route all my system's traffic through Gluetun, my threat model doesn't need it, I just route relevant apps, e.g. package management is in the clear but firefox, SearXNG, and nicotine go via gluetun. SSH can look after itself, or I'm in dire trouble. If my threat model did need it, I'd be considering a similar solution to yours, but it'd be heavily cribbed from the known good of gluetun, basically the docker (podman) put to bare metal.

[–] xabadak@lemmings.world 2 points 6 months ago

Yeah, it does come down to threat model and preference. If you only need to route specific apps, Gluetun sounds like a great solution.