tests/smime: add tests for S/MIME SignedData

Add a simple S/MIME SignedData message, taken from an upcoming draft
of
https://datatracker.ietf.org/doc/draft-autocrypt-lamps-protected-headers/

RFC 8551 describes a SignedData, a one-part clearsigned object that is
more resistant to common patterns of MTA message munging than
multipart/signed (but has the downside that it is only readable by
clients that implement S/MIME).

To make sure sure notmuch can handle this kind of object, we want to
know a few things:

Already working:

 - Is the content of the SignedData object indexed?  It actually is
   right now because of dumb luck -- i think we're indexing the raw
   CMS object and it happens to contain the cleartext of the message
   in a way that we can consume it before passing it on to Xapian.
 - Are we accidentally indexing the embedded PKCS#7 certificates? We
   don't want to, and for some reason I don't understand, our indexing
   is actually skipping the embedded certificates already.  That's
   good!

Still need fixing:
 - do we know the MIME type of the embedded part?
 - do we know that the message is signed?
 - can notmuch-show read its content?
 - can notmuch-show indicate the signature validity?
 - can notmuch-reply properly quote and attribute content?

Signed-off-by: Daniel Kahn Gillmor <dkg@fifthhorseman.net>

1 files changed, 51 insertions, 0 deletions

diff --git a/test/corpora/pkcs7/smime-onepart-signed.eml b/test/corpora/pkcs7/smime-onepart-signed.eml
new file mode 100644
index 00000000..070303b7
--- /dev/null
+++ b/test/corpora/pkcs7/smime-onepart-signed.eml
@@ -0,0 +1,51 @@
+Received: from localhost (localhost [127.0.0.1]); Tue, 26 Nov 2019
+ 20:11:46 -0400 (UTC-04:00)
+Content-Transfer-Encoding: base64
+Content-Type: application/pkcs7-mime; name="smime.p7m";
+ smime-type="signed-data"
+MIME-Version: 1.0
+From: Alice Lovelace <alice@smime.example>
+To: Bob Babbage <bob@smime.example>
+Date: Tue, 26 Nov 2019 20:11:29 -0400
+Subject: The FooCorp contract
+Message-ID: <smime-onepart-signed@protected-headers.example>
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