[exim] Re: Setting dkim_verify_minimal to true, does not ter…

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Autor: Jeremy Harris
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A: exim-users
Assumpte: [exim] Re: Setting dkim_verify_minimal to true, does not terminate validation after first success
On 09/07/2024 08:30, Sander Smeenk via Exim-users wrote:
> HTH. Let me know if i can help test things!


Excellent. It does help... and says there's some fixing work to do.

I think the way the coding has mutated over time lost track of the
intent of the dkim_verify_minimal option. The current state is that
it does affect the evaluation of the signatures (hence, a "true" value
will save on crypto effort vs. multiple sigs) but does not affect the
calls to the ACL.

[ In particular, a setting for dkim_verify_signers that does not
include all of $dkim_signers, combined with a trues setting for
dkim_verify_minimal, would not operate reliably. Few people
would ever do that, fortunately.
]

The docs are lacking precision, saying only

"cease verification processing for a message once the first passing
signature is found"

- but the Principle Of Least Astonishment says to me that running the ACL
and handling its results ought to be included.


This will be more work than is feasible for the upcoming release.
I'll start with the 4.next branch. Can you build from git and test
any changes I might invent?
--
Cheers,
Jeremy


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