Bumping apt RSA key length requirements to 3072-bit (2048 w/ warning) for 24.04

Michael Hudson-Doyle michael.hudson at canonical.com
Wed Jan 24 03:50:48 UTC 2024


On Tue, 23 Jan 2024 at 02:31, Jeremy Bícha <jeremy.bicha at canonical.com>
wrote:

> On Mon, Jan 22, 2024 at 7:36 AM Dimitri John Ledkov
> <dimitri.ledkov at canonical.com> wrote:
> > > Sadly shipping this in 24.04 means that PPAs owned by user
> > > accounts created prior to 2014-03-11[3] until the key rotation
> > > mechanism(s) [4][5] have been implemented.
> > >
> >
> > I do wonder how many active old PPA owners remain in action.
> >
> > And if we can reset per-series signing keys on all of those for any
> > new PPAs, and noble series (meaning single signe, new key for noble+).
> >
> > I have personally created a new team for myself, only added myself to
> > be a member of said team, to gain access to PPAs signed with 4k RSA
> > key, as I can no longer use my own ppas. I guess I should ask to
> > delete them all, and request removal of the signing key to gain back
> > personal PPAs with 4k signing key.
>
> Many of Ubuntu's core teams are older than 2014. This includes
> Desktop, Checkbox, Kernel, Pythoneers, Security, Mozilla, LibreOffice,
> Kubuntu, Lubuntu.
>
> I suspect that this change would break most of the heaviest used PPAs.
> We need a coordinated transition.
>

I agree with Jeremy that we can't just blithely assume all PPAs created
before 2014 are no longer much used.

Unfortunately I don't know what that means for a way forward. Clearly 1024R
keys should be retired. From one angle, I can imagine a scheme were a repo
is dual-signed and signs the new key with the old to convince apt to update
it but from another this seems impossible (and clearly very unlikely to
land before noble GA).

Cheers,
mwh
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