this post was submitted on 28 Sep 2023
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I'm not advocating for this right now, but yes that is why when using TPM password, one must insure to enable secure boot, enable bios password, disable boot media, and disable grub editing. That's the recommended proceedure for this setup.
This is essentially how HEADs works too. Some very smart people have worked on TPM boot and it is even built into systemd. You're just wrong here.
Reference:
Whether I would fully rely on the systems proper operation against a state sponsored adversary is a different question though.
Here is an alternative Piped link(s):
Matthew Garrett - TPM based attention
Piped is a privacy-respecting open-source alternative frontend to YouTube.
I'm open-source; check me out at GitHub.
Ah yes security brought to you by the same folks who brought you "bypass encryption by holding down the enter key" and "name your user 0day to get root access"
It's like putting security cams and interior locks all over your house instead of locking the front door. If your storage can't be read without the passphrase then NOTHING can fail in such a way as to provide access. Simplicity and obvious correctness have virtues.
There isn't much reason to use anything other than FDE with a sufficient passphrase, auto login so the user doesn't have to type two distinct passwords, and go luks suspends to evict key from memory on suspend.
Boot up enter the passphrase -> see your desktop -> close the lid -> open the lid -> enter your passphrase
I don't think you understand the TPM chain, there is absolutely value in validating that the firmware, bootloader, kernel, and initramfs haven't changed and not decrypt the disk if they have. That's what the TPM does, it doesn't just store a key, it calculates it.
Obviously, the optimal setup is TPM calculation + passphrase, which completely avoids decrypting the drive if some compromise, or modification, happened somewhere in the bootchain, or if the disk is taken out of the computer.
I never suggested there wasn't value in the TPM for anyone although I think such validation has small value for most folks use case. Normal users are worried about theft of laptop by criminals not spies bugging their machine. I suggested that any configuration without a passphrase was inherently insecure.
It's not an "optimal setup" its the only setup that makes even the slightest sense because the alternative configuration can be defeated by a smart 12 year old with access to google.