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

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

this post was submitted on 09 May 2024

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