smime: tests of X.509 certificate validity are known-broken on GMime < 3.2.7

When checking cryptographic signatures, Notmuch relies on GMime to
tell it whether the certificate that signs a message has a valid User
ID or not.

If the User ID is not valid, then notmuch does not report the signer's
User ID to the user.  This means that the consumer of notmuch's
cryptographic summary of a message (or of its protected headers) can
be confident in relaying the reported identity to the user.

However, some versions of GMime before 3.2.7 cannot report Certificate
validity for X.509 certificates.  This is resolved upstream in GMime
at https://github.com/jstedfast/gmime/pull/90.

We adapt to this by marking tests of reported User IDs for
S/MIME-signed messages as known-broken if GMime is older than 3.2.7
and has not been patched.

If GMime >= 3.2.7 and certificate validity still doesn't work for
X.509 certs, then there has likely been a regression in GMime and we
should fail early, during ./configure.

To break out these specific User ID checks from other checks, i had to
split some tests into two parts, and reuse $output across the two
subtests.

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

2 files changed, 21 insertions, 9 deletions

diff --git a/test/T355-smime.sh b/test/T355-smime.sh
index 117fa2b9..f8e8e396 100755
--- a/test/T355-smime.sh
+++ b/test/T355-smime.sh
@@ -187,13 +187,16 @@ test_valid_json "$output"
 test_begin_subtest "Verify signature on PKCS#7 SignedData message"
 test_subtest_known_broken
 output=$(notmuch show --format=json id:smime-onepart-signed@protected-headers.example)
+
+test_json_nodes <<<"$output" \
+                'created:[0][0][0]["crypto"]["signed"]["status"][0]["created"]=1574813489' \
+                'expires:[0][0][0]["crypto"]["signed"]["status"][0]["expires"]=2611032858' \
+                'fingerprint:[0][0][0]["crypto"]["signed"]["status"][0]["fingerprint"]="702BA4B157F1E2B7D16B0C6A5FFC8A7DE2057DEB"' \
+                'status:[0][0][0]["crypto"]["signed"]["status"][0]["status"]="good"'
+
+test_begin_subtest "Verify signature on PKCS#7 SignedData message signer User ID"
+test_subtest_known_broken
 test_json_nodes <<<"$output" \
-                'crypto:[0][0][0]["crypto"]["signed"]["status"][0]={
-                        "created" : 1574813489,
-                        "expires" : 2611032858,
-                        "fingerprint" : "702BA4B157F1E2B7D16B0C6A5FFC8A7DE2057DEB",
-                        "userid" : "CN=Alice Lovelace",
-                        "status" : "good"
-                     }'
+                'userid:[0][0][0]["crypto"]["signed"]["status"][0]["userid"]="CN=Alice Lovelace"'
 
 test_done
diff --git a/test/T356-protected-headers.sh b/test/T356-protected-headers.sh
index 520cb71c..5fd27434 100755
--- a/test/T356-protected-headers.sh
+++ b/test/T356-protected-headers.sh
@@ -163,8 +163,13 @@ for variant in multipart-signed onepart-signed; do
                     'signed_subject:[0][0][0]["crypto"]["signed"]["headers"]=["Subject"]' \
                     'sig_good:[0][0][0]["crypto"]["signed"]["status"][0]["status"]="good"' \
                     'sig_fpr:[0][0][0]["crypto"]["signed"]["status"][0]["fingerprint"]="702BA4B157F1E2B7D16B0C6A5FFC8A7DE2057DEB"' \
-                    'sig_uid:[0][0][0]["crypto"]["signed"]["status"][0]["userid"]="CN=Alice Lovelace"' \
                     'not_encrypted:[0][0][0]["crypto"]!"decrypted"'
+    test_begin_subtest "verify signed PKCS#7 subject ($variant) signer User ID"
+    if [ $NOTMUCH_GMIME_X509_CERT_VALIDITY -ne 1 ] || [ "$variant" != multipart-signed ]; then
+        test_subtest_known_broken
+    fi
+    test_json_nodes <<<"$output" \
+                    'sig_uid:[0][0][0]["crypto"]["signed"]["status"][0]["userid"]="CN=Alice Lovelace"'
 done
 
 for variant in sign+enc sign+enc+legacy-disp; do
@@ -175,8 +180,12 @@ for variant in sign+enc sign+enc+legacy-disp; do
                     'signed_subject:[0][0][0]["crypto"]["signed"]["headers"]=["Subject"]' \
                     'sig_good:[0][0][0]["crypto"]["signed"]["status"][0]["status"]="good"' \
                     'sig_fpr:[0][0][0]["crypto"]["signed"]["status"][0]["fingerprint"]="702BA4B157F1E2B7D16B0C6A5FFC8A7DE2057DEB"' \
-                    'sig_uid:[0][0][0]["crypto"]["signed"]["status"][0]["userid"]="CN=Alice Lovelace"' \
                     'encrypted:[0][0][0]["crypto"]["decrypted"]={"status":"full","header-mask":{"Subject":"..."}}'
+    test_begin_subtest "confirm signed and encrypted PKCS#7 subject ($variant) signer User ID"
+    test_subtest_known_broken
+    test_json_nodes <<<"$output" \
+                    'sig_uid:[0][0][0]["crypto"]["signed"]["status"][0]["userid"]="CN=Alice Lovelace"'
+
 done
 
 test_begin_subtest "confirm encryption-protected PKCS#7 subject (enc+legacy-disp)"