tests: filter out TLS distinguished name in certificate checks

The version of GNUTLS in Fedora 34 has changed the order in which encodes
fields when generating new TLS certificates. This in turn changes the
order seen when querying the distinguished name. This ultimately breaks
the expected output in the NBD TLS iotests. We don't need to be
comparing the exact distinguished name text for the purpose of the test
though, so it is fine to filter it out.

Reported-by: Eric Blake <[email protected]>
Signed-off-by: Daniel P. Berrangé <[email protected]>
Message-Id: <[email protected]>
Reviewed-by: Eric Blake <[email protected]>
Tested-by: Eric Blake <[email protected]>
Signed-off-by: Hanna Reitz <[email protected]>

Author: berrange

tests/qemu-iotests/233

@@ -148,7 +148,7 @@ $QEMU_IMG info --image-opts \
 
 echo
 echo "== final server log =="
-cat "$TEST_DIR/server.log"
+cat "$TEST_DIR/server.log" | _filter_authz_check_tls
 rm -f "$TEST_DIR/server.log"
 
 # success, all done

tests/qemu-iotests/233.out

@@ -65,6 +65,6 @@ qemu-img: Could not open 'driver=nbd,host=127.0.0.1,port=PORT,tls-creds=tls0': F
 == final server log ==
 qemu-nbd: option negotiation failed: Verify failed: No certificate was found.
 qemu-nbd: option negotiation failed: Verify failed: No certificate was found.
-qemu-nbd: option negotiation failed: TLS x509 authz check for CN=localhost,O=Cthulhu Dark Lord Enterprises client1,L=R'lyeh,C=South Pacific is denied
-qemu-nbd: option negotiation failed: TLS x509 authz check for CN=localhost,O=Cthulhu Dark Lord Enterprises client3,L=R'lyeh,C=South Pacific is denied
+qemu-nbd: option negotiation failed: TLS x509 authz check for DISTINGUISHED-NAME is denied
+qemu-nbd: option negotiation failed: TLS x509 authz check for DISTINGUISHED-NAME is denied
 *** done

tests/qemu-iotests/common.filter

@@ -332,5 +332,10 @@ for fname in fnames:
 sys.stdout.write(result)'
 }
 
+_filter_authz_check_tls()
+{
+    $SED -e 's/TLS x509 authz check for .* is denied/TLS x509 authz check for DISTINGUISHED-NAME is denied/'
+}
+
 # make sure this script returns success
 true