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# coding: utf-8
from datetime import datetime, timedelta, timezone
import pytest
from asn1crypto import core, x509
from pyhanko_certvalidator import PathBuildingError
from pyhanko_certvalidator.authority import (
Authority,
CertTrustAnchor,
TrustedServiceType,
TrustQualifiers,
)
from pyhanko_certvalidator.registry import (
CertificateRegistry,
PathBuilder,
SimpleTrustManager,
TrustManager,
)
from .common import load_cert_object
def test_build_paths_custom_ca_certs():
cert = load_cert_object('testing-ca-ed25519', 'signer.cert.pem')
other_certs = [load_cert_object('testing-ca-ed25519', 'interm.cert.pem')]
builder = PathBuilder(
trust_manager=SimpleTrustManager.build(trust_roots=other_certs),
registry=CertificateRegistry.build(certs=other_certs),
)
paths = builder.build_paths(cert)
assert 1 == len(paths)
path = paths[0]
assert 2 == len(path)
assert [item.subject.sha1 for item in path] == [
b'Xm\xb3f\xac[T\x13\xbaP$\x13\xfb\x93L\xf0\x9ex\x83V',
b'\x8d\x19\xc0\xcdx\x84[\x7f\xe3/$\x86B\xfc\x83\xd9Kzm\x97',
]
def test_build_paths_qualified_root_with_wrong_type():
cert = load_cert_object('testing-ca-ed25519', 'signer.cert.pem')
ca = load_cert_object('testing-ca-ed25519', 'interm.cert.pem')
other_certs = [ca]
builder = PathBuilder(
trust_manager=SimpleTrustManager.build(
trust_roots=[
CertTrustAnchor(
ca,
TrustQualifiers(
trusted_service_type=TrustedServiceType.UNSUPPORTED
),
)
]
),
registry=CertificateRegistry.build(certs=other_certs),
)
with pytest.raises(PathBuildingError):
builder.build_paths(cert)
def _gen_issuer_candidate_cert(key_identifier, common_name, coords):
dt = datetime(2019, 9, 10, tzinfo=timezone.utc)
cert_in = load_cert_object('testing-ca-ed25519', 'signer.cert.pem')
pubkey = cert_in.public_key
extensions = [
x509.Extension(
{
'extn_id': 'key_usage',
'critical': False,
'extn_value': x509.KeyUsage(
{'key_cert_sign', 'digital_signature'}
),
}
)
]
if key_identifier:
extensions.append(
x509.Extension(
{
'extn_id': 'key_identifier',
'critical': False,
'extn_value': core.OctetString(key_identifier),
}
)
)
tbs = x509.TbsCertificate(
{
'version': 'v3',
'serial_number': coords[1],
'signature': {'algorithm': 'sha256_rsa'},
'issuer': x509.Name.build({'common_name': coords[0]}),
'validity': {
'not_before': x509.Time({'utc_time': dt}),
'not_after': x509.Time({'utc_time': dt + timedelta(days=3650)}),
},
'subject': x509.Name.build({'common_name': common_name}),
'subject_public_key_info': pubkey,
'extensions': extensions,
}
)
cert = x509.Certificate(
{
'tbs_certificate': tbs,
'signature_algorithm': {'algorithm': 'sha256_rsa'},
'signature_value': core.OctetBitString(b""),
}
)
return cert
def _gen_subject_candidate_cert(aki, iss_common_name, iss_coords):
iss_name = x509.Name.build({'common_name': iss_common_name})
dt = datetime(2019, 9, 10, tzinfo=timezone.utc)
cert_in = load_cert_object('testing-ca-ed25519', 'signer.cert.pem')
pubkey = cert_in.public_key
extensions = [
x509.Extension(
{
'extn_id': 'key_usage',
'critical': False,
'extn_value': x509.KeyUsage({'digital_signature'}),
}
)
]
if aki or iss_coords:
vals = {}
if aki:
vals['key_identifier'] = aki
if iss_coords:
vals['authority_cert_issuer'] = x509.GeneralNames(
[
x509.GeneralName(
name='directory_name',
value=x509.Name.build({'common_name': iss_coords[0]}),
)
]
)
vals['authority_cert_serial_number'] = iss_coords[1]
extensions.append(
x509.Extension(
{
'extn_id': 'authority_key_identifier',
'critical': False,
'extn_value': x509.AuthorityKeyIdentifier(vals),
}
)
)
tbs = x509.TbsCertificate(
{
'version': 'v3',
'serial_number': 1,
'signature': {'algorithm': 'sha256_rsa'},
'issuer': iss_name,
'validity': {
'not_before': x509.Time({'utc_time': dt}),
'not_after': x509.Time({'utc_time': dt + timedelta(days=3650)}),
},
'subject': x509.Name.build({'common_name': 'subject'}),
'subject_public_key_info': pubkey,
'extensions': extensions,
}
)
cert = x509.Certificate(
{
'tbs_certificate': tbs,
'signature_algorithm': {'algorithm': 'sha256_rsa'},
'signature_value': core.OctetBitString(b""),
}
)
return cert
class DummyTrustManager(TrustManager):
def find_potential_issuers(self, cert: x509.Certificate):
return iter(())
def as_trust_anchor(self, authority: Authority):
return None
@pytest.mark.parametrize(
"key_identifier,authority_cert_coords",
[
# by key identifier
(b"foo", None),
# by auth cert coordinates
(None, ("root", 0)),
# both
(b"foo", ("root", 0)),
],
)
def test_disambiguate_issuer_by_authority_info(
key_identifier, authority_cert_coords
):
subject = _gen_subject_candidate_cert(
key_identifier, "issuer", authority_cert_coords
)
issuer1 = _gen_issuer_candidate_cert(b"foo", "issuer", ("root", 0))
issuer2 = _gen_issuer_candidate_cert(b"bar", "issuer", ("root", 1))
registry = CertificateRegistry.build([issuer1, issuer2])
found = list(registry.find_potential_issuers(subject, DummyTrustManager()))
assert len(found) == 1
assert found[0].dump() == issuer1.dump()
def test_partial_match_handling_aki_filter():
# corner case handling, not realistic in a sane PKI
subject = _gen_subject_candidate_cert(b"foo", "issuer", ("root", 0))
issuer1 = _gen_issuer_candidate_cert(b"foo", "issuer", ("root", 0))
issuer2 = _gen_issuer_candidate_cert(b"bar", "issuer", ("root", 0))
issuer3 = _gen_issuer_candidate_cert(b"foo", "issuer", ("root", 1))
registry = CertificateRegistry.build([issuer1, issuer2, issuer3])
found = list(registry.find_potential_issuers(subject, DummyTrustManager()))
assert len(found) == 1
assert found[0].dump() == issuer1.dump()
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