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What are the most paranoid network/OS security measures you've implemented in your homelab? (self.selfhosted)

submitted 9 months ago by MigratingtoLemmy to c/selfhosted

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As the title says, I want to know the most paranoid security measures you've implemented in your homelab. I can think of SDN solutions with firewalls covering every interface, ACLs, locked-down/hardened OSes etc but not much beyond that. I'm wondering how deep this paranoia can go (and maybe even go down my own route too!).

Thanks!

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[–] thantik 34 points 9 months ago* (last edited 9 months ago) (1 children)

I've replaced reconnaissance commands (a handful of them found here: https://www.cybrary.it/blog/linux-commands-used-attackers) -- whoami, uname, id, uptime, last, etc

With shell scripts which run the command but also send me a notification via pushover. I'm running several internet-facing services, and the moment those get run because someone is doing some sleuthing inside the machine, I get notified.

It doesn't stop people getting in, I've set up other things for that -- but on the off chance that there is some zero-day that I don't know about yet, or they've traversed the network laterally somehow, the moment they run one of those commands, I know to kill-switch the entire thing.

The thing is, security is an on-going process. Leave any computer attached to the internet long enough and it'll be gotten into. I don't trust being able to know every method that can be used, so I use this as a backup.

[–] MigratingtoLemmy 7 points 9 months ago

That's a very good idea. Something to think about, especially if you have open ports and are paranoid enough (aren't we all? Hehe). Thanks