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182

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

submitted 9 months ago by MigratingtoLemmy@lemmy.world to c/selfhosted@lemmy.world

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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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[–] chayleaf@lemmy.ml 6 points 9 months ago* (last edited 9 months ago) (7 children)

full disk encryption on everything except the router (no point in encrypting the router)
- the server doesn't have a display connected for obvious reasons, so I'm manually unlocking it via ssh on each boot
  - obviously, the SSH keys are different, so the server has a different IP in initrd. That said, I still don't have any protection against malicious modification of initrd or UEFI
the server scans all new SSL certificates in realtime using certspotter and notifies me of any new certificates issued for my domains that it doesn't know about (I use Cloudflare so it triggers relatively often, but I still do checks on who the issuer is)
firewall blocks outgoing 25 so nobody can impersonate my mailserver

[–] JustEnoughDucks@feddit.nl 1 points 9 months ago

I use a similar setup, but use a USB for my boot drive that has the lvs partition encryption keyfile. I find it much handier since my computer is not near my server. I can boot and then walk upstairs and it is ready, and remove the USB later.

Then there is no way to brute force the decryption or get a password out of me. Also, when the USB is removed and put in a safe place, there is no way to modify the boot partition or UEFI either.

Then I have a password encryption on my data harddrives that I don't know the password to, but is on my password manager.

The thing about being paranoid about this stuff is that I probably focused on the wrong thing. A smash & grab is completely protected against, but that is like a 0.1% chance anyway and a 0.1% chance on top of that 0.1% chance that it would be targeted enough that they would even try to decrypt it.

Full disk encryption is really only usefully at all for an unpowered system. Network hardening will probably take care of 99.99% of attack attempts where encryption is 0.01%.

Even for a laptop, if it gets stolen in public, it is still running and can have the keys extracted or break into the running system if someone really wants to hack it. They wouldn't even try to reboot and break the disk encryption probably...

Too much info, but I guess I am just rambling about how dumb my approach probably is 😅

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