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NixOS + TPMs

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14 Dec 2024
@netpleb:matrix.orgnetpleb * Is it possible for me to supply the seeds to my TPM rather than have the TPM generate them?23:31:29
@netpleb:matrix.orgnetpleb * Is it possible for me to supply the endorsement and platform seeds to my TPM rather than have the TPM generate them?23:36:25
16 Dec 2024
@netpleb:matrix.orgnetpleb attempting to answer my own question here: as far as I can tell this is probably possible for a virtual/emulated TPM but is likely not straightforward. Still not sure about physical TPMs 20:48:09
22 Dec 2024
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12 Jan 2025
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@nakibrayane:matrix.orgRayane Nakib (ريان نقيب)Hello, I recently got a new laptop with a modern CPU that have a TPM chip, What can I do with it to improve the security of my system?12:45:10
@elikoga:matrix.orgelikoga
In reply to @nakibrayane:matrix.org
Hello, I recently got a new laptop with a modern CPU that have a TPM chip, What can I do with it to improve the security of my system?

https://jnsgr.uk/2024/04/nixos-secure-boot-tpm-fde/

You can use it to unlock your encrypted disk without user intervention

14:59:17
@nakibrayane:matrix.orgRayane Nakib (ريان نقيب)How is this more secure then dm-crypt with a password, If someone store my laptop, they can just assess all the data in it.16:30:53
@nakibrayane:matrix.orgRayane Nakib (ريان نقيب)* How is this more secure then dm-crypt with a password? If someone store my laptop, they can just assess all the data in it.16:31:34
@elikoga:matrix.orgelikoga

No? I hope you have your user account protected with a password.

The tpm will not release your encryption keys if system integrity is not given. For example my laptop tpm locks if you open the chassis

16:31:58
@nakibrayane:matrix.orgRayane Nakib (ريان نقيب)So they can't just put the hard disk in another PC, My hard disk will only unlock in my laptop. And then the security of my data is protected with userspace programs (e.g. GDM, tty login), Is this correct?16:34:29
@nakibrayane:matrix.orgRayane Nakib (ريان نقيب)And is this more secure then dm-crypt?16:34:38
@elikoga:matrix.orgelikogaIn combination with dmcrypt it is in my opinion more secure since you don't need to input an encryption key by hand16:35:17
@elikoga:matrix.orgelikoga Or luks/dmcrypt not sure what the delineation is exactly 16:35:33
@elikoga:matrix.orgelikoga
In reply to @nakibrayane:matrix.org
So they can't just put the hard disk in another PC, My hard disk will only unlock in my laptop. And then the security of my data is protected with userspace programs (e.g. GDM, tty login), Is this correct?
I think that's correct
16:35:47
@nakibrayane:matrix.orgRayane Nakib (ريان نقيب)But if there is a bug with GDM, they would get access to my computer, I think that dm-crypt have is more secure. 16:37:55

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