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this post was submitted on 07 Feb 2024
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Say it with me now: LUUUUUKS
LUKS is still vulnerable to this attack if you enable autodecrypt using TPM. This attack is based on the vulnerability that the CPU and TPM communicates uses plain text. And it is a pretty common attack against TPM:
https://dolosgroup.io/blog/2021/7/9/from-stolen-laptop-to-inside-the-company-network
And apparently Linux is not doing too hot on this regard either:
https://www.secura.com/blog/tpm-sniffing-attacks-against-non-bitlocker-targets
However, this attack is not viable for device with firmware based solution, like fTPM, Microsoft Pluton, secure enclave etc. in these case TPM is part of the cpu, hence have no exposed pins to sniff their connection.
So if you don't want people with physical access to your computer (a thief or a evil maiden) to access everything on your disk, don't setup TPM auto decrypt.
Because of course
CPU doesn't have any secure storage, so it can't encrypt or authenticate comms to the TPM. The on-CPU fTPMs are the solution, the CPU then has the secure storage.
That make sense, CPU has no place to store private keys, since that is the functionality of TPM...
Unless there is a firmware solution, which defeats the purpose of a standalone tpm.
I wondered why LUUUUUKS didnt use the TPM, why do i have to put my password in... this is absolutely why.
Edit: fixed spelling of LUUUUUKS
Also yes you can, I wouldn't recommend it though. Maybe in addition to your password though.
Wait until you see Dracut and Tang.
What exactly is the point of full disk encryption if the system auto-unlocks on boot?
Protection against tampering, maybe?
Bad excuse, but that is the logic I've heard.