I have a bug report from a notmuch user that notmuch is unable to verify
the signature on a message with the following mime structure
└┬╴multipart/signed 29717 bytes
├┬╴multipart/related 18125 bytes
│├┬╴multipart/alternative 14402 bytes
││├─╴text/plain 2766 bytes
││└─╴text/html 11223 bytes
│└─╴image/jpeg [image001.jpg] 3372 bytes
└─╴application/pkcs7-signature attachment [smime.p7s] 6979 bytes
The problem seems to be that the outer Content-Type declares
Content-Type: multipart/signed;
protocol="application/x-pkcs7-signature";
while the actual signature part has
Content-Type: application/pkcs7-signature;
gmime quite correctly reports this as a mismatch, but I wonder if it
should be a tolerated mismatch? I saw there is already some attempt in
gmime to alias the two content-types, but I didn't follow the scope of
that aliasing.
Unfortunately I cannot share the message in question, but if needed I
could try to make an artificial test message with the same issue.
All the best,
David
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