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bug#35414: 26.2; ELPA packages signed with second, unknown key

From: Glenn Morris
Subject: bug#35414: 26.2; ELPA packages signed with second, unknown key
Date: Wed, 24 Apr 2019 12:08:48 -0400
User-agent: Gnus (www.gnus.org), GNU Emacs (www.gnu.org/software/emacs/)

Please forgive the top-posting.

I assume (without checking) that this is related to the key from

Brandon Invergo wrote:

> I enabled package.el's signature-checking feature last night (variable
> package-check-signature; Emacs 26.2).  I have imported the keyring at
> etc/package-keyring.gpg, which contains one key:
> pub   dsa2048 2014-09-24 [SC] [expires: 2019-09-23]
>       CA442C00F91774F17F59D9B0474F05837FBDEF9B
> uid           [ unknown] GNU ELPA Signing Agent <address@hidden>
> GNU ELPA is the only repository that has been enabled
> (https://elpa.gnu.org/packages).
> When I execute package-refresh-contents or when I try to install a
> package from ELPA, it fails with the following error:
>     Failed to verify signature archive-contents.sig:
>     No public key for 066DAFCB81E42C40 created at 2019-04-24T10:15:06+0100 
> using RSA
>     Good signature from 474F05837FBDEF9B GNU ELPA Signing Agent 
> <address@hidden> (trust undefined) created at 2019-04-24T10:15:06+0100 using 
>     Command output:
>     gpg: Signature made Wed 24 Apr 2019 10:15:06 AM BST
>     gpg:                using DSA key CA442C00F91774F17F59D9B0474F05837FBDEF9B
>     gpg: Good signature from "GNU ELPA Signing Agent <address@hidden>" 
> [unknown]
>     gpg: WARNING: This key is not certified with a trusted signature!
>     gpg:          There is no indication that the signature belongs to the 
> owner.
>     Primary key fingerprint: CA44 2C00 F917 74F1 7F59  D9B0 474F 0583 7FBD 
> EF9B
>     gpg: Signature made Wed 24 Apr 2019 10:15:06 AM BST
>     gpg:                using RSA key C433554766D3DDC64221BFAA066DAFCB81E42C40
>     gpg: Can't check signature: No public key
> So, the signature by GNU ELPA Signing Agent (the key in
> etc/package-keyring.gpg) is fine.  However, there is a second key
> involved, for which the public key 066DAFCB81E42C40 is unavailable from
> any public keyserver that I have tried.  Needless to say, it's not
> available in etc/package-keyring.gpg either.  Since I do not have the
> public key, the signature verification fails.
> Just to be sure, I've also done it on a fresh installation-from-source
> with an init.el that is empty apart from setting up package.el.  Same
> results.
> I have tried this from outside Emacs, by doing, for example:
>     wget https://elpa.gnu.org/packages/delight-1.5.el{,.sig}
>     gpg2 --verify delight-1.5.el.sig
> This, of course, gives the same result as doing it from within Emacs.  I
> mention it here to demonstrate that the problem is not in Emacs, from
> what I can tell, but it is strictly due to this second, unknown key
> signature.
> For the extra paranoid, I've tried this on three different systems
> residing on three different networks in two different countries.  I'm
> pretty sure the problem is on the ELPA server and is a result of the
> standard signing process.  However, we can't 100% rule out user
> incompetence yet (my own, that is), so I am open to suggestions of what
> else I might try to pin down the source of the problem.
> Is the public key 066DAFCB81E42C40 available anywhere?  Or have I set up
> something else incorrectly in the verification process?  Or is this
> second signature there erroneously?

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