Running a Windows VM on KVM, how do I restrict network access to specific applications instead of the entire OS? (lemmy.world)

submitted 9 months ago* (last edited 9 months ago) by MigratingtoLemmy@lemmy.world to c/selfhosted@lemmy.world

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Hi everyone,

Is there any way to restrict network access for a Windows VM using KVM other than a couple of applications (Windows explorer and Firefox)? ~~I don't want to get into configuring the Windows firewall and would like to do this using KVM/other linux utilities on the host machine if possible~~ As I thought, it is unlikely that I will be able to do this from the KVM side of things. Would anyone have an idea of how I could script this for subsequent Windows VMs?

Thanks!

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[-] MigratingtoLemmy@lemmy.world 2 points 9 months ago

I see, it's simply disallowing everything except a specific port on that IP.

Considering that it will likely be a base Windows install, I don't think other applications will be able to hijack that specific port so swiftly. With that said, can I possibly only allow traffic to and fro from the proxy through my firewall? Assuming that I'll be running an HTTP proxy, I should be able to (in theory) inspect traffic too, although I don't know how far that will take me.

[-] e0qdk@kbin.social 1 points 9 months ago

With that said, can I possibly only allow traffic to and fro from the proxy through my firewall?

Yes. That is what I suggested. If you configure the firewall to only allow traffic to/from the specific IP and port combination of your proxy, other traffic will be blocked.

I should be able to (in theory) inspect traffic too, although I don’t know how far that will take me.

You can do content filtering via a proxy like that, yes. A similar sort of configuration is used on school computers to do things like block adult content, with varying degrees of success. Some ad-blocking techniques work on similar principles.

[-] MigratingtoLemmy@lemmy.world 1 points 9 months ago

I was wondering if I could label the traffic to and from the proxy, and not have to rely on ports for filtering

[-] LufyCZ@lemmy.world 2 points 9 months ago

You can whitelist both the proxy and the ip, blacklist everything else.

[-] MigratingtoLemmy@lemmy.world 1 points 9 months ago

I see. Thanks!

this post was submitted on 05 Oct 2023

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