Encrypted root volume requires passphrase twice on boot

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3 participants
  • Jakub K?dzio?ka
  • Matthew Leach
  • Tobias Geerinckx-Rice
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Matthew Leach
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Matthew Leach wrote on 4 Jan 2020 20:27
(address . bug-guix@gnu.org)
87pnfznhsw.fsf@mattleach.net
Hi Guix!

I've setup guix on two machines each one of them with an encrypted root
partition. However, on boot I'm prompted for my passphrase twice, once
before the grub menu is shown and second after Linux has started and
launched guile as init.

I would expect to have to only enter my passphrase once per boot.

Regards,
--
Matt
T
T
Tobias Geerinckx-Rice wrote on 4 Jan 2020 20:56
87woa73shv.fsf@nckx
Matthew,

Matthew Leach ???
Toggle quote (8 lines)
> I've setup guix on two machines each one of them with an
> encrypted root
> partition. However, on boot I'm prompted for my passphrase
> twice, once
> before the grub menu is shown and second after Linux has started
> and
> launched guile as init.

Unfortunately, this is expected.

GRUB needs to decrypt the volume to load the Linux-Libre kernel
and initrd, and there's no agreed-upon secure way for GRUB to pass
the passphrase or key to the kernel/initrd. So you're prompted
for it again when the volume is actually mounted by the kernel.

Toggle quote (3 lines)
> I would expect to have to only enter my passphrase once per
> boot.

Most distributions hack around this limitation by including the
unencrypted LUKS key in the initrd on the encrypted volume itself.
Guix doesn't currently have any code to do the same.

This has been a problem for years but, by sheer coincidence, Jakub
K?dzio?ka (CC'd) mentioned that this was on their to-do list for
next week.

Kind regards,

T G-R
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T
T
Tobias Geerinckx-Rice wrote on 4 Jan 2020 21:01
(no subject)
(name . GNU bug tracker automated control server)(address . control@debbugs.gnu.org)
87tv5b3saq.fsf@nckx
severity 38924 wishlist
merge 32054 38924
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J
J
Jakub K?dzio?ka wrote on 14 Jan 2020 01:02
Assigning bugs I will soon send patches for to myself (where soon = a few days)
(address . control@debbugs.gnu.org)
20200114000245.4q7mv7y6mqgpbxz4@zdrowyportier.kadziolka.net
owner 38884 !
owner 32054 !
thanks
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