def test_sv_sign_addrevinfo_subfilter_conflict():
sv = fields.SigSeedValueSpec(flags=fields.SigSeedValFlags.ADD_REV_INFO,
subfilters=[PADES],
add_rev_info=True)
with pytest.raises(SigningError):
meta = signers.PdfSignatureMetadata(field_name='Sig',
validation_context=dummy_ocsp_vc(),
embed_validation_info=True)
sign_with_sv(sv, meta)
revinfo_and_subfilter = (fields.SigSeedValFlags.ADD_REV_INFO
| fields.SigSeedValFlags.SUBFILTER)
sv = fields.SigSeedValueSpec(flags=revinfo_and_subfilter,
subfilters=[PADES],
add_rev_info=True)
meta = signers.PdfSignatureMetadata(field_name='Sig',
validation_context=dummy_ocsp_vc(),
embed_validation_info=True)
with pytest.raises(SigningError):
sign_with_sv(sv, meta)
sign_with_sv(sv, meta, test_violation=True)
sv = fields.SigSeedValueSpec(flags=revinfo_and_subfilter,
subfilters=[PADES],
add_rev_info=False)
meta = signers.PdfSignatureMetadata(
field_name='Sig',
validation_context=dummy_ocsp_vc(),
)
sign_with_sv(sv, meta)
def test_sv_version():
fields.SigSeedValueSpec.from_pdf_object(
generic.DictionaryObject({'/Ff': fields.SigSeedValFlags.V}))
fields.SigSeedValueSpec.from_pdf_object(
fields.SigSeedValueSpec(flags=fields.SigSeedValFlags.V,
sv_dict_version=fields.SeedValueDictVersion.
PDF_2_0).as_pdf_object())
with pytest.raises(SigningError):
fields.SigSeedValueSpec.from_pdf_object(
fields.SigSeedValueSpec(flags=fields.SigSeedValFlags.V,
sv_dict_version=4).as_pdf_object())
def test_field_lock_compat():
sv = fields.SigSeedValueSpec(flags=fields.SigSeedValFlags.LOCK_DOCUMENT,
lock_document=fields.SeedLockDocument.LOCK)
meta = signers.PdfSignatureMetadata(field_name='Sig')
sign_with_sv(sv, meta, add_field_lock=True)
sv = fields.SigSeedValueSpec(
flags=fields.SigSeedValFlags.LOCK_DOCUMENT,
lock_document=fields.SeedLockDocument.DO_NOT_LOCK)
meta = signers.PdfSignatureMetadata(field_name='Sig')
with pytest.raises(SigningError):
sign_with_sv(sv, meta, add_field_lock=True)
def test_sv_mdp_type():
sv_dict = fields.SigSeedValueSpec().as_pdf_object()
assert '/MDP' not in sv_dict
sv_dict = fields.SigSeedValueSpec(
seed_signature_type=fields.SeedSignatureType(None)).as_pdf_object()
assert sv_dict['/MDP'] == generic.DictionaryObject(
{pdf_name('/P'): generic.NumberObject(0)})
sv_dict = fields.SigSeedValueSpec(
seed_signature_type=fields.SeedSignatureType(
fields.MDPPerm.NO_CHANGES)).as_pdf_object()
assert sv_dict['/MDP'] == generic.DictionaryObject(
{pdf_name('/P'): generic.NumberObject(1)})
sv_spec = fields.SigSeedValueSpec.from_pdf_object(
generic.DictionaryObject({
pdf_name('/MDP'):
generic.DictionaryObject({pdf_name('/P'): generic.NumberObject(0)})
}))
assert sv_spec.seed_signature_type == fields.SeedSignatureType(None)
sv_spec = fields.SigSeedValueSpec.from_pdf_object(
generic.DictionaryObject({
pdf_name('/MDP'):
generic.DictionaryObject({pdf_name('/P'): generic.NumberObject(2)})
}))
assert sv_spec.seed_signature_type == fields.SeedSignatureType(
fields.MDPPerm.FILL_FORMS)
with pytest.raises(SigningError):
fields.SigSeedValueSpec.from_pdf_object(
generic.DictionaryObject({
pdf_name('/MDP'):
generic.DictionaryObject(
{pdf_name('/P'): generic.NumberObject(5)})
}))
with pytest.raises(SigningError):
fields.SigSeedValueSpec.from_pdf_object(
generic.DictionaryObject({
pdf_name('/MDP'):
generic.DictionaryObject(
{pdf_name('/P'): generic.NullObject()})
}))
with pytest.raises(SigningError):
fields.SigSeedValueSpec.from_pdf_object(
generic.DictionaryObject(
{pdf_name('/MDP'): generic.DictionaryObject()}))
with pytest.raises(SigningError):
fields.SigSeedValueSpec.from_pdf_object(
generic.DictionaryObject({pdf_name('/MDP'): generic.NullObject()}))
def test_sv_sign_md_req():
sv = fields.SigSeedValueSpec(
flags=fields.SigSeedValFlags.DIGEST_METHOD,
digest_methods=['sha256', 'sha512'],
)
with pytest.raises(SigningError):
sign_with_sv(
sv, signers.PdfSignatureMetadata(
md_algorithm='sha1', field_name='Sig'
)
)
sign_with_sv(
sv, signers.PdfSignatureMetadata(md_algorithm='sha1', field_name='Sig'),
test_violation=True
)
emb_sig = sign_with_sv(
sv, signers.PdfSignatureMetadata(field_name='Sig')
)
assert emb_sig.md_algorithm == 'sha256'
emb_sig = sign_with_sv(
sv, signers.PdfSignatureMetadata(
md_algorithm='sha512', field_name='Sig'
)
)
assert emb_sig.md_algorithm == 'sha512'
def test_sv_no_lock_certify():
sv = fields.SigSeedValueSpec(
flags=fields.SigSeedValFlags.LOCK_DOCUMENT,
lock_document=fields.SeedLockDocument.DO_NOT_LOCK)
meta = signers.PdfSignatureMetadata(
field_name='Sig',
certify=True,
docmdp_permissions=fields.MDPPerm.FILL_FORMS)
sign_with_sv(sv, meta)
meta = signers.PdfSignatureMetadata(
field_name='Sig',
certify=True,
docmdp_permissions=fields.MDPPerm.ANNOTATE)
sign_with_sv(sv, meta)
meta = signers.PdfSignatureMetadata(
field_name='Sig',
certify=True,
)
sign_with_sv(sv, meta)
meta = signers.PdfSignatureMetadata(field_name='Sig')
sign_with_sv(sv, meta)
meta = signers.PdfSignatureMetadata(
field_name='Sig',
certify=True,
docmdp_permissions=fields.MDPPerm.NO_CHANGES)
sign_with_sv(sv, meta, test_violation=True)
def test_sv_sign_addrevinfo_req(requests_mock):
sv = fields.SigSeedValueSpec(flags=fields.SigSeedValFlags.ADD_REV_INFO,
add_rev_info=True)
vc = live_testing_vc(requests_mock)
meta = signers.PdfSignatureMetadata(
field_name='Sig',
validation_context=vc,
subfilter=fields.SigSeedSubFilter.ADOBE_PKCS7_DETACHED,
embed_validation_info=True)
emb_sig = sign_with_sv(sv, meta)
status = validate_pdf_ltv_signature(
emb_sig, RevocationInfoValidationType.ADOBE_STYLE,
{'trust_roots': TRUST_ROOTS})
assert status.valid and status.trusted
assert emb_sig.sig_object['/SubFilter'] == '/adbe.pkcs7.detached'
meta = signers.PdfSignatureMetadata(
field_name='Sig',
validation_context=vc,
subfilter=fields.SigSeedSubFilter.ADOBE_PKCS7_DETACHED,
embed_validation_info=False)
with pytest.raises(SigningError):
sign_with_sv(sv, meta)
sign_with_sv(sv, meta, test_violation=True)
meta = signers.PdfSignatureMetadata(
field_name='Sig',
validation_context=vc,
subfilter=fields.SigSeedSubFilter.PADES,
embed_validation_info=True)
# this shouldn't work with PAdES
with pytest.raises(SigningError):
sign_with_sv(sv, meta)
sign_with_sv(sv, meta, test_violation=True)
def test_sv_subfilter_unsupported_partial():
sv_spec = fields.SigSeedValueSpec(
flags=fields.SigSeedValFlags.SUBFILTER,
subfilters=[fields.SigSeedSubFilter.ADOBE_PKCS7_DETACHED, PADES])
w = IncrementalPdfFileWriter(prepare_sv_field(sv_spec))
field_name, _, sig_field = next(fields.enumerate_sig_fields(w))
sig_field = sig_field.get_object()
sv_ref = sig_field.raw_get('/SV')
w.mark_update(sv_ref)
sv_ref.get_object()['/SubFilter'][0] = pdf_name('/this.doesnt.exist')
out = BytesIO()
w.write(out)
out.seek(0)
frozen = out.getvalue()
signers.sign_pdf(IncrementalPdfFileWriter(BytesIO(frozen)),
signers.PdfSignatureMetadata(field_name='Sig'),
signer=FROM_CA,
timestamper=DUMMY_TS)
with pytest.raises(SigningError):
signers.sign_pdf(
IncrementalPdfFileWriter(BytesIO(frozen)),
signers.PdfSignatureMetadata(
field_name='Sig',
subfilter=fields.SigSeedSubFilter.ADOBE_PKCS7_DETACHED),
signer=FROM_CA,
timestamper=DUMMY_TS)
def test_sv_flag_appearance_required():
sv = fields.SigSeedValueSpec(
flags=fields.SigSeedValFlags.APPEARANCE_FILTER,
appearance='test'
)
meta = signers.PdfSignatureMetadata(field_name='Sig')
with pytest.raises(SigningError):
sign_with_sv(sv, meta)
def test_sv_cert_flag_unsupported():
sv = fields.SigSeedValueSpec(
cert=fields.SigCertConstraints(
flags=fields.SigCertConstraintFlags.RESERVED,
)
)
meta = signers.PdfSignatureMetadata(field_name='Sig')
with pytest.raises(NotImplementedError):
sign_with_sv(sv, meta)
def test_sv_sign_cert_constraint():
# this is more thoroughly unit tested at a lower level (see further up),
# so we simply try two basic scenarios here for now
from asn1crypto import x509
sv = fields.SigSeedValueSpec(cert=fields.SigCertConstraints(
flags=fields.SigCertConstraintFlags.SUBJECT_DN,
subject_dn=x509.Name.build({'common_name': 'Lord Testerino'}),
))
sign_with_sv(sv, signers.PdfSignatureMetadata(field_name='Sig'))
sv = fields.SigSeedValueSpec(cert=fields.SigCertConstraints(
flags=fields.SigCertConstraintFlags.SUBJECT_DN,
subject_dn=x509.Name.build({'common_name': 'Not Lord Testerino'}),
))
with pytest.raises(SigningError):
sign_with_sv(sv, signers.PdfSignatureMetadata(field_name='Sig'))
sign_with_sv(sv,
signers.PdfSignatureMetadata(field_name='Sig'),
test_violation=True)
def test_sv_flag_unsupported():
sv = fields.SigSeedValueSpec(
flags=(fields.SigSeedValFlags.LEGAL_ATTESTATION
| fields.SigSeedValFlags.APPEARANCE_FILTER),
legal_attestations=['abc'],
appearance='test')
meta = signers.PdfSignatureMetadata(field_name='Sig')
with pytest.raises(NotImplementedError):
sign_with_sv(sv, meta, test_violation=True)
def test_sv_mdp_must_certify_wrong_docmdp():
sv = fields.SigSeedValueSpec(seed_signature_type=fields.SeedSignatureType(
fields.MDPPerm.FILL_FORMS), )
meta = signers.PdfSignatureMetadata(
field_name='Sig',
certify=True,
docmdp_permissions=fields.MDPPerm.NO_CHANGES)
with pytest.raises(SigningError):
sign_with_sv(sv, meta)
def test_sv_sign_subfilter_hint():
sv = fields.SigSeedValueSpec(subfilters=[PADES])
emb_sig = sign_with_sv(
sv,
signers.PdfSignatureMetadata(
md_algorithm='sha1',
field_name='Sig',
subfilter=fields.SigSeedSubFilter.ADOBE_PKCS7_DETACHED))
assert emb_sig.sig_object['/SubFilter'] == '/adbe.pkcs7.detached'
emb_sig = sign_with_sv(sv, signers.PdfSignatureMetadata(field_name='Sig'))
assert emb_sig.sig_object['/SubFilter'] == PADES.value
def test_sv_sign_md_hint():
sv = fields.SigSeedValueSpec(digest_methods=['sha256', 'sha512'])
emb_sig = sign_with_sv(
sv, signers.PdfSignatureMetadata(md_algorithm='sha1',
field_name='Sig'))
assert emb_sig.md_algorithm == 'sha1'
emb_sig = sign_with_sv(sv, signers.PdfSignatureMetadata(field_name='Sig'))
assert emb_sig.md_algorithm == 'sha256'
emb_sig = sign_with_sv(
sv,
signers.PdfSignatureMetadata(md_algorithm='sha512', field_name='Sig'))
assert emb_sig.md_algorithm == 'sha512'
def test_sv_mdp_no_certify():
sv = fields.SigSeedValueSpec(
seed_signature_type=fields.SeedSignatureType(), )
meta = signers.PdfSignatureMetadata(field_name='Sig')
sign_with_sv(sv, meta)
meta = signers.PdfSignatureMetadata(field_name='Sig', certify=True)
with pytest.raises(SigningError):
sign_with_sv(sv, meta)
meta = signers.PdfSignatureMetadata(field_name='Sig', certify=True)
sign_with_sv(sv, meta, test_violation=True)
def test_sv_sign_reason_prohibited(reasons_param):
sv = fields.SigSeedValueSpec(flags=fields.SigSeedValFlags.REASONS,
reasons=reasons_param)
aw_yiss = signers.PdfSignatureMetadata(reason='Aw yiss', field_name='Sig')
with pytest.raises(SigningError):
sign_with_sv(sv, aw_yiss)
sign_with_sv(sv, aw_yiss, test_violation=True)
dot = signers.PdfSignatureMetadata(reason='.', field_name='Sig')
with pytest.raises(SigningError):
sign_with_sv(sv, dot)
sign_with_sv(sv, dot, test_violation=True)
emb_sig = sign_with_sv(sv, signers.PdfSignatureMetadata(field_name='Sig'))
assert pdf_name('/Reason') not in emb_sig.sig_object
def test_sv_sign_reason_req():
sv = fields.SigSeedValueSpec(flags=fields.SigSeedValFlags.REASONS,
reasons=['I agree', 'Works for me'])
aw_yiss = signers.PdfSignatureMetadata(reason='Aw yiss', field_name='Sig')
with pytest.raises(SigningError):
sign_with_sv(sv, aw_yiss)
sign_with_sv(sv, aw_yiss, test_violation=True)
with pytest.raises(SigningError):
sign_with_sv(sv, signers.PdfSignatureMetadata(field_name='Sig'))
sign_with_sv(sv,
signers.PdfSignatureMetadata(field_name='Sig'),
test_violation=True)
emb_sig = sign_with_sv(
sv, signers.PdfSignatureMetadata(field_name='Sig', reason='I agree'))
assert emb_sig.sig_object['/Reason'] == 'I agree'
def test_sv_timestamp_url(requests_mock):
# state issues (see comment in signers.py), so create a fresh signer
sv = fields.SigSeedValueSpec(timestamp_server_url=DUMMY_HTTP_TS.url,
timestamp_required=True)
meta = signers.PdfSignatureMetadata(field_name='Sig')
ts_requested = False
def ts_callback(*args, **kwargs):
nonlocal ts_requested
ts_requested = True
return ts_response_callback(*args, **kwargs)
requests_mock.post(DUMMY_HTTP_TS.url,
content=ts_callback,
headers={'Content-Type': 'application/timestamp-reply'})
# noinspection PyTypeChecker
sign_with_sv(sv, meta, timestamper=None)
assert ts_requested
def test_sv_sign_subfilter_req():
sv = fields.SigSeedValueSpec(flags=fields.SigSeedValFlags.SUBFILTER,
subfilters=[PADES])
with pytest.raises(SigningError):
sign_with_sv(
sv,
signers.PdfSignatureMetadata(
md_algorithm='sha1',
field_name='Sig',
subfilter=fields.SigSeedSubFilter.ADOBE_PKCS7_DETACHED))
sign_with_sv(sv,
signers.PdfSignatureMetadata(
md_algorithm='sha1',
field_name='Sig',
subfilter=fields.SigSeedSubFilter.ADOBE_PKCS7_DETACHED),
test_violation=True)
emb_sig = sign_with_sv(sv, signers.PdfSignatureMetadata(field_name='Sig'))
assert emb_sig.sig_object['/SubFilter'] == PADES.value
def test_append_sig_field_with_simple_sv():
w = IncrementalPdfFileWriter(BytesIO(MINIMAL))
sv = fields.SigSeedValueSpec(
reasons=['a', 'b', 'c'],
cert=fields.SigCertConstraints(
subject_dn=FROM_CA.signing_cert.subject,
issuers=[INTERM_CERT],
subjects=[FROM_CA.signing_cert],
key_usage=[
fields.SigCertKeyUsage.from_sets(
{'digital_signature', 'non_repudiation'},
{'key_agreement'})
]),
digest_methods=['ssh256'],
add_rev_info=True,
subfilters=[fields.SigSeedSubFilter.ADOBE_PKCS7_DETACHED],
timestamp_server_url='https://tsa.example.com',
)
sp = fields.SigFieldSpec('InvisibleSig', seed_value_dict=sv)
fields.append_signature_field(w, sp)
out = BytesIO()
w.write(out)
out.seek(0)
r = PdfFileReader(out)
_, _, sig_field_ref = next(fields.enumerate_sig_fields(r))
sv_dict = sig_field_ref.get_object()['/SV']
assert sv_dict['/V'] == generic.NumberObject(2)
del sv_dict['/V']
recovered_sv = fields.SigSeedValueSpec.from_pdf_object(sv_dict)
# x509.Certificate doesn't have an __eq__ implementation apparently,
# so for the purposes of the test, we replace them by byte dumps
issuers1 = recovered_sv.cert.issuers
issuers2 = sv.cert.issuers
issuers1[0] = issuers1[0].dump()
issuers2[0] = issuers2[0].dump()
subjects1 = recovered_sv.cert.subjects
subjects2 = sv.cert.subjects
subjects1[0] = subjects1[0].dump()
subjects2[0] = subjects2[0].dump()
assert recovered_sv == sv
async def test_add_revinfo_wrong_subfilter():
sv = fields.SigSeedValueSpec(flags=fields.SigSeedValFlags.ADD_REV_INFO,
add_rev_info=True)
sig_field_spec = fields.SigFieldSpec(
sig_field_name='Sig',
seed_value_dict=sv,
)
w = IncrementalPdfFileWriter(BytesIO(MINIMAL))
fields.append_signature_field(w, sig_field_spec)
cms_writer = cms_embedder.PdfCMSEmbedder().write_cms(field_name='Sig',
writer=w)
next(cms_writer)
# wrong subfilter: PAdES
# but we do embed an (empty) RevInfoArchival attribute
sig_obj = signers.SignatureObject(bytes_reserved=8192, subfilter=PADES)
cms_writer.send(cms_embedder.SigObjSetup(sig_placeholder=sig_obj))
prep_digest, output = cms_writer.send(
cms_embedder.SigIOSetup(md_algorithm='sha256', in_place=True))
cms_obj = await FROM_CA.async_sign(
data_digest=prep_digest.document_digest,
digest_algorithm='sha256',
signed_attr_settings=PdfCMSSignedAttributes(
# empty
adobe_revinfo_attr=asn1_pdf.RevocationInfoArchival({'ocsp': []})))
await PdfTBSDocument.async_finish_signing(output, prep_digest, cms_obj)
r = PdfFileReader(output)
s = r.embedded_signatures[0]
status = await async_validate_pdf_signature(s, dummy_ocsp_vc())
summary = status.pretty_print_details()
assert status.intact and status.valid
assert 'not satisfy the SV constraints' in summary
assert 'requires subfilter' in status.seed_value_constraint_error.args[0]
assert not status.seed_value_ok