Bug 2235323 - RFE: don't strip old signatures while exporting pub key
Summary: RFE: don't strip old signatures while exporting pub key
Status: NEW
Alias: None
Product: Fedora
Classification: Fedora
Component: gnupg2
Version: 37
Hardware: Unspecified
OS: Linux
Target Milestone: ---
Assignee: Jakub Jelen
QA Contact: Fedora Extras Quality Assurance
Depends On:
TreeView+ depends on / blocked
Reported: 2023-08-28 12:49 UTC by Pavel Raiskup
Modified: 2023-11-23 01:49 UTC (History)
4 users (show)

Fixed In Version:
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Description Pavel Raiskup 2023-08-28 12:49:59 UTC
In Copr, we generate RPM signature key pairs when a new Copr project is
created.  With 5 years expiration.

If project lives longer than 4 years, we prolong the keypair with gpg
--edit-key with 'expire 5y' to get longer validity (ie 9 years in total).
The older RPMs stay unchanged (signed with old signature), the newly built
RPMs are signed with the new (prolonged) signature.

The thing is that after the `expire 5y` action, the pubkey we get with
`--export` doesn't contain all the necessary info to validate the old
signatures we historically did (before the `expire 5y` action).  It seems that
the old signature is stripped from `--export`ed pub key.

It would be nice to have a way to `--export` not-stripped pub key, containing
all the previous signatures.  Either by default, or with an option, so such a
pub-key can be used to validate both old and new RPMs.  I'm not a GPG expert,
nor an RPM expert, so I'm not sure how to design this properly.  Cooperating
with the RPM/RPM-SEQUOIA developers might be necessary to design this
properly; this is probably crucial feature to implement RPM signatures
properly long-term.

This is the original issue we filled to resolve recent signature checking
failures in Copr, lot of important info is there:

The way we (I believe) export the pub-key using obs-signd:

This is how we generate the keypair initially:

This is how we prolong the signature keypair:

Reproducible: Always

Comment 1 Jakub Jelen 2023-08-29 10:47:18 UTC
Filled upstream issue https://dev.gnupg.org/T6689

Comment 2 Aoife Moloney 2023-11-23 01:49:54 UTC
This message is a reminder that Fedora Linux 37 is nearing its end of life.
Fedora will stop maintaining and issuing updates for Fedora Linux 37 on 2023-12-05.
It is Fedora's policy to close all bug reports from releases that are no longer
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