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NixOS + TPMs

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17 Jul 2021
@mic92:nixos.devMic92Also interesting: https://github.com/mtth-bfft/tpm-otp08:18:28
@andi:kack.itandi-
In reply to @mic92:nixos.dev
The key for what?
The key for the passwords.
08:47:47
@mic92:nixos.devMic92
In reply to @andi:kack.it
The key for the passwords.
It seems like a small win in security for an increased complexity, since the passwords itself are still in plain
08:48:57
@andi:kack.itandi-Yeah but it defeats all kinds of offline attacks on my password database08:49:24
@andi:kack.itandi-you can use my entire disk and still have no way to decrypt my passwords. Not even if you also have a memory dump.08:49:38
@andi:kack.itandi-You only obtain what you can observe me requesting.08:50:02
@mic92:nixos.devMic92I can imangine for most people the risk of loosing access to all their passwords is higher when their hardware breaks than the added security.08:51:56
@mic92:nixos.devMic92 * I can imagine for most people the risk of loosing access to all their passwords is higher when their hardware breaks than the added security.08:52:18
@andi:kack.itandi- I would only loose access to keys on that machine and not all my passwords. 08:52:50
@andi:kack.itandi-which is a perfectly acceptable risk for me as I can still use my YubiKey to access passwords (or another device with the same scheme).08:53:32
@andi:kack.itandi-
In reply to @mic92:nixos.dev
Also interesting: https://github.com/mtth-bfft/tpm-otp
This looks like it wouldn't go well with other TPM applications as they try to manage the TPM directly and write to random nvram positions.
09:17:56
@grahamc:nixos.org@grahamc:nixos.org
Corrected a problem which generated improper hash values on 16 bit machines
23:34:21
@grahamc:nixos.org@grahamc:nixos.orgdamn this file has a LOT of history23:34:58
18 Jul 2021
@grahamc:nixos.org@grahamc:nixos.org okay andi- I was maybe predictable wrong about the rvram 00:40:08
@grahamc:nixos.org@grahamc:nixos.orgto r/w space you have to preallocate a chunk with nvdefine, and it gives you an "NV Index" in response:00:40:49

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