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Date: Thu, 11 Aug 2022 15:25:32 +0000
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To: Andrew Tropin <andrew@trop.in>
From: John Kehayias <john.kehayias@protonmail.com>
Cc: guix-devel@gnu.org, Maxime Devos <maximedevos@telenet.be>,
 Tobias Geerinckx-Rice <me@tobias.gr>, Efraim Flashner <efraim@flashner.co.il>,
 =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@gnu.org>
Subject: Re: [POSTMORTEM] Subkey is not authorized by .guix-authorizations
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Hi everyone,

Thanks for this write-up and discussion Andrew. I'm also following along in=
 [0] but I'll just chime in here for now.

When I saw this I was worried since I also "just" use subkeys, meaning for =
all signing etc. only my subkey is used. These are set to expire each year =
and then I renew them. For places like GitLab/Hub, this requires deleting t=
he public key and re-adding it after I renew keys. Old commits still show a=
s verified.

Anyway, that's my basic usage and I was worried that I would break a (third=
 party) Guix channel when I was added as a committer. Indeed, that is what =
just happened, with the same steps: my primary key fingerprint was added to=
 .guix-authorizations. GitLab was happy enough verifying the (subkey signed=
) commits, and even Cuirass would get the commits and build them. (Side not=
e: does Cuirass not do guix pull? Why would it not fail to pull just as a u=
ser?)

All that is to say that I think the use case of someone only using subkeys =
is valid and one we could expect and should handle. Now, the correct and be=
st way to do that, especially with things like time-travel, I don't know. I=
 just wanted to note that I think only expecting the primary key (rather th=
an subkeys) is limiting.

Finally, as a concrete example of this usage, I manage my keys with a hardw=
are key (YubiKey) and followed this [1] guide to setting up with subkeys th=
at I renew regularly. The primary key isn't really used for much and I thin=
k this works well, all I manage is renewal every so often.=20

[0] https://issues.guix.gnu.org/57091=20

[1] https://github.com/drduh/YubiKey-Guide

John