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Re: Signing a message with S/MIME in Gnus?
From: |
Angel de Vicente |
Subject: |
Re: Signing a message with S/MIME in Gnus? |
Date: |
Thu, 03 Nov 2022 07:21:04 +0000 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/28.2 (gnu/linux) |
Hello,
Jens Lechtenboerger <jens.lechtenboerger@fsfe.org> writes:
> There is. Before coming to that, please reconsider for what you
> ask: Alice sends a message to Bob, but the message is signed by
> Mallory. What is Bob supposed to do with this?
Yes, I realized after I sent the message that this was going to be
confusing. I managed to do it by setting
'mml-secure-smime-sign-with-sender' to nil, so that I could then choose
the certificate, but Gmail (for example) complains about the mail
address in the certificate not being the same as the "From" address, so
probably not a good idea in general.
> IMO, the signature should really match the sender’s FROM address.
> Maybe you can ask your CA to include your other e-mail addresses as
> well? Or switch to GnuPG for your other e-mail addresses, where you
> are in control and not some CA (which Bob probably does neither know
> nor trust anyways)? See [1] for more information.
So, I was actually thinking of going for the second option: use SMIME
when I send from the address in the certificate, and use PGP when
sending from this gmail address. But now I need to figure out how to
tell Gnus to do that. Right now I have the following, which makes sure
that by default I will be always signing with SMIME. Do you know if
there is an easy way to set these depending on the "From" address?
,----
| (add-hook 'gnus-message-setup-hook 'mml-secure-message-sign-smime)
| (setq mml-secure-method "smime")
`----
Cheers,
--
Ángel de Vicente -- (GPG: 0x64D9FDAE7CD5E939)
Research Software Engineer (Supercomputing and BigData)
Instituto de Astrofísica de Canarias (https://www.iac.es/en)
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