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python: overhaul logic of Context.decrypt()

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* lang/python/src/core.py (Context.decrypt): simplify and clarify the
logic behind handling verify=False.
* lang/python/tests/t-decrypt.py: ensure that we test verify=False

--

The function-internal variables were pretty unclear to the reader, and
the logic caused pretty nasty breakage when verify=False.

GnuPG-Bug-Id: 4271
Signed-off-by: Daniel Kahn Gillmor <dkg@fifthhorseman.net>
This commit is contained in:
Daniel Kahn Gillmor 2018-12-04 20:44:35 +03:00 committed by Andre Heinecke
parent 878a0ad012
commit 65c28da4e4
No known key found for this signature in database
GPG Key ID: 2978E9D40CBABA5C
2 changed files with 36 additions and 34 deletions
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68
lang/python/src/core.py
View File

@ -370,8 +370,8 @@ class Context(GpgmeWrapper):
GPGMEError -- as signaled by the underlying library
"""
sink_result = False
verify_sigs = False
do_sig_verification = False
required_keys = None
plaintext = sink if sink else Data()
if passphrase is not None:
@ -385,22 +385,25 @@ class Context(GpgmeWrapper):
self.set_passphrase_cb(passphrase_cb)
try:
if verify is not None:
if isinstance(verify, bool) is True:
if verify is False:
verify = True
sink_result = True
elif isinstance(verify, list) is True:
if len(verify) > 0:
verify_sigs = True
else:
verify = True
if isinstance(verify, bool):
do_sig_verification = verify
elif verify is None:
warnings.warn(
"ctx.decrypt called with verify=None, should be bool or iterable (treating as False).",
category=DeprecationWarning)
do_sig_verification = False
else:
# we hope this is an iterable:
required_keys = verify
do_sig_verification = True
if do_sig_verification:
self.op_decrypt_verify(ciphertext, plaintext)
else:
self.op_decrypt(ciphertext, plaintext)
except errors.GPGMEError as e:
result = self.op_decrypt_result()
if verify is not None and not sink_result:
if do_sig_verification:
verify_result = self.op_verify_result()
else:
verify_result = None
@ -415,7 +418,7 @@ class Context(GpgmeWrapper):
result = self.op_decrypt_result()
if verify is not None and not sink_result:
if do_sig_verification:
verify_result = self.op_verify_result()
else:
verify_result = None
@ -426,7 +429,7 @@ class Context(GpgmeWrapper):
raise errors.UnsupportedAlgorithm(result.unsupported_algorithm,
results=results)
if verify:
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
@ -434,25 +437,24 @@ class Context(GpgmeWrapper):
if any(s.status != errors.NO_ERROR
for s in verify_result.signatures):
raise errors.BadSignatures(verify_result, results=results)
if verify_sigs:
missing = []
for key in verify:
ok = False
for subkey in key.subkeys:
for sig in verify_result.signatures:
if sig.summary & constants.SIGSUM_VALID == 0:
continue
if subkey.can_sign and subkey.fpr == sig.fpr:
ok = True
if required_keys is not None:
missing = []
for key in required_keys:
ok = False
for subkey in key.subkeys:
for sig in verify_result.signatures:
if sig.summary & constants.SIGSUM_VALID == 0:
continue
if subkey.can_sign and subkey.fpr == sig.fpr:
ok = True
break
if ok:
break
if not ok:
missing.append(key)
if missing:
raise errors.MissingSignatures(verify_result, missing,
results=results)
if ok:
break
if not ok:
missing.append(key)
if missing:
raise errors.MissingSignatures(verify_result, missing,
results=results)
return results

2
lang/python/tests/t-decrypt.py
View File

@ -38,7 +38,7 @@ support.print_data(sink)
# Idiomatic interface.
with gpg.Context() as c:
plaintext, _, _ = c.decrypt(open(support.make_filename("cipher-1.asc")))
plaintext, _, _ = c.decrypt(open(support.make_filename("cipher-1.asc")), verify=False)
assert len(plaintext) > 0
assert plaintext.find(b'Wenn Sie dies lesen k') >= 0, \
'Plaintext not found'