Merge remote-tracking branch 'origin/dkg/fix-T4276'

lang/python/src/core.py

@@ -342,10 +342,12 @@ class Context(GpgmeWrapper):
 
         Decrypt the given ciphertext and verify any signatures.  If
         VERIFY is an iterable of keys, the ciphertext must be signed
-        by all those keys, otherwise an error is raised.  Note: if
-        VERIFY is an empty iterable, that is treated the same as
-        passing verify=True (that is, do verify signatures, but no
-        specific keys are required).
+        by all those keys, otherwise a MissingSignatures error is
+        raised.  Note: if VERIFY is an empty iterable, that is treated
+        the same as passing verify=True (that is, verify signatures
+        and return data about any valid signatures found, but no
+        signatures are required and no MissingSignatures error will be
+        raised).
 
         If the ciphertext is symmetrically encrypted using a
         passphrase, that passphrase can be given as parameter, using a
@@ -361,11 +363,10 @@ class Context(GpgmeWrapper):
         Returns:
         plaintext	-- the decrypted data (or None if sink is given)
         result		-- additional information about the decryption
-        verify_result	-- additional information about the signature(s)
+        verify_result	-- additional information about the valid signature(s) found
 
         Raises:
         UnsupportedAlgorithm -- if an unsupported algorithm was used
-        BadSignatures	-- if a bad signature is encountered
         MissingSignatures -- if expected signatures are missing or bad
         GPGMEError	-- as signaled by the underlying library
 
@@ -430,13 +431,8 @@ class Context(GpgmeWrapper):
                                               results=results)
 
         if do_sig_verification:
-            # FIXME: should we really throw BadSignature, even if
-            # we've encountered some good signatures?  as above, once
-            # we hit this error, there is no way to accept it and
-            # continue to process the remaining signatures.
-            if any(s.status != errors.NO_ERROR
-                   for s in verify_result.signatures):
-                raise errors.BadSignatures(verify_result, results=results)
+            # filter out all invalid signatures
+            verify_result.signatures = list(filter(lambda s: s.status == errors.NO_ERROR, verify_result.signatures))
             if required_keys is not None:
                 missing = []
                 for key in required_keys:

lang/python/tests/Makefile.am

@@ -28,7 +28,7 @@ TESTS_ENVIRONMENT = GNUPGHOME=$(GNUPGHOME) \
 	srcdir=$(srcdir) \
 	LD_LIBRARY_PATH="../../../src/.libs:$(LD_LIBRARY_PATH)"
 
-py_tests = t-wrapper.py \
+py_tests ?= t-wrapper.py \
 	t-callbacks.py \
 	t-data.py \
 	t-encrypt.py \

lang/python/tests/t-decrypt-verify.py

@@ -75,3 +75,15 @@ with gpg.Context() as c:
         assert e.missing[0] == bob
     else:
         assert False, "Expected an error, got none"
+
+    plaintext, _, verify_result = c.decrypt(open(support.make_filename("cipher-no-sig.asc")))
+    assert len(plaintext) > 0
+    assert len(verify_result.signatures) == 0
+    assert plaintext.find(b'Viscosity Dispersal Thimble Saturday Flaxseed Deflected') >= 0, \
+        'unsigned Plaintext was not found'
+
+    plaintext, _, verify_result = c.decrypt(open(support.make_filename("cipher-3.asc")))
+    assert len(plaintext) > 0
+    assert len(verify_result.signatures) == 1
+    assert plaintext.find(b'Reenact Studied Thermos Bonehead Unclasp Opposing') >= 0, \
+        'second Plaintext not found'

lang/python/tests/t-decrypt.py

@@ -42,3 +42,13 @@ with gpg.Context() as c:
     assert len(plaintext) > 0
     assert plaintext.find(b'Wenn Sie dies lesen k') >= 0, \
         'Plaintext not found'
+
+    plaintext, _, _ = c.decrypt(open(support.make_filename("cipher-3.asc")), verify=False)
+    assert len(plaintext) > 0
+    assert plaintext.find(b'Reenact Studied Thermos Bonehead Unclasp Opposing') >= 0, \
+        'second Plaintext not found'
+
+    plaintext, _, _ = c.decrypt(open(support.make_filename("cipher-no-sig.asc")), verify=False)
+    assert len(plaintext) > 0
+    assert plaintext.find(b'Viscosity Dispersal Thimble Saturday Flaxseed Deflected') >= 0, \
+        'third Plaintext was not found'

tests/gpg/Makefile.am

@@ -59,6 +59,7 @@ private_keys = \
 
 EXTRA_DIST = initial.test final.test \
         pubdemo.asc secdemo.asc cipher-1.asc cipher-2.asc \
+	cipher-3.asc cipher-no-sig.asc \
 	geheim.txt pubkey-1.asc seckey-1.asc pinentry $(private_keys)
 
 BUILT_SOURCES = gpg.conf gpg-agent.conf pubring-stamp \

tests/gpg/cipher-3.asc

@@ -0,0 +1,18 @@
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+aM8pI7NOi48b
+=mh2s
+-----END PGP MESSAGE-----

tests/gpg/cipher-no-sig.asc

@@ -0,0 +1,13 @@
+-----BEGIN PGP MESSAGE-----
+
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+4bhskRTIBJBaPtPnRGevlxardQi+Spbd75yqccCLjkQF0HhCLiHW9SJiLSMdnY1U
+U9th3ZR5
+=uvfB
+-----END PGP MESSAGE-----