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Evil maid or something? Idk I use LUKS (lemmy.ml)
submitted 1 year ago by fl42v@lemmy.ml to c/linuxmemes@lemmy.world
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[-] redditReallySucks@lemmy.dbzer0.com 2 points 1 year ago

Is it even possible to mitigate such an issue? Will resetting the bios by removing the cmos battery not also disable password protection in the bios thus making it possible to disable secure boot?

And at that point could they not just use a hardware keylogger or something?

[-] BautAufWasEuchAufbaut 3 points 1 year ago* (last edited 1 year ago)

Yes, with a TPM. A TPM (2.0) can seal secrets and only release it when a machine fulfills certain configuration and state requirements (saved into registers called PCRs).
For example: make the decryption key one part dependant on a passphrase you memorized (to not only rely on a TPM), and one part on something saved in a TPM. If you select the correct PCRs when saving the latter, and your TPM works as advertised (and doesn't offer an easy way to eavesdrop/fool it), removing the battery would make the TPM not release the secret (if removing the battery even still works on modern machines).
However, this depends on having a unified kernel image, having configured dm-verity and maybe more stuff I don't recall right now. Probably should also make sure you don't allow Microsoft's Secure Boot keys and instead only your own. I hope this will get easier in the future, but I know SystemD is actively developing useful tools for that (e.g. ukify).
That all doesn't mean the critique of TPMs (intransparent, proprietary) is invalid. Maybe we'll have OpenTitan based TPMs at some point?

this post was submitted on 24 Jan 2024
174 points (100.0% liked)

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