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test_x509.py
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test_x509.py
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# This file is dual licensed under the terms of the Apache License, Version
# 2.0, and the BSD License. See the LICENSE file in the root of this repository
# for complete details.
import binascii
import copy
import datetime
import ipaddress
import os
import typing
import pytest
from cryptography import utils, x509
from cryptography.exceptions import InvalidSignature, UnsupportedAlgorithm
from cryptography.hazmat.bindings._rust import asn1
from cryptography.hazmat.primitives import hashes, serialization
from cryptography.hazmat.primitives.asymmetric import (
dh,
dsa,
ec,
ed448,
ed25519,
padding,
rsa,
types,
x448,
x25519,
)
from cryptography.hazmat.primitives.asymmetric.utils import (
decode_dss_signature,
)
from cryptography.x509.name import _ASN1Type
from cryptography.x509.oid import (
AuthorityInformationAccessOID,
ExtendedKeyUsageOID,
ExtensionOID,
NameOID,
SignatureAlgorithmOID,
SubjectInformationAccessOID,
)
from ..hazmat.primitives.fixtures_dsa import DSA_KEY_2048, DSA_KEY_3072
from ..hazmat.primitives.fixtures_ec import EC_KEY_SECP256R1
from ..hazmat.primitives.fixtures_rsa import (
RSA_KEY_2048_ALT,
)
from ..hazmat.primitives.test_ec import _skip_curve_unsupported
from ..hazmat.primitives.test_rsa import rsa_key_512, rsa_key_2048
from ..utils import (
load_nist_vectors,
load_vectors_from_file,
raises_unsupported_algorithm,
)
# Make ruff happy since we're importing fixtures that pytest patches in as
# func args
__all__ = ["rsa_key_512", "rsa_key_2048"]
class DummyExtension(x509.ExtensionType):
oid = x509.ObjectIdentifier("1.2.3.4")
class FakeGeneralName(x509.GeneralName):
def __init__(self, value):
self._value = value
@property
def value(self):
return self._value
T = typing.TypeVar("T")
def _load_cert(filename, loader: typing.Callable[..., T]) -> T:
return load_vectors_from_file(
filename=filename,
loader=lambda pemfile: loader(pemfile.read()),
mode="rb",
)
def _generate_ca_and_leaf(
issuer_private_key: types.CertificateIssuerPrivateKeyTypes,
subject_private_key: types.CertificateIssuerPrivateKeyTypes,
):
if isinstance(
issuer_private_key,
(ed25519.Ed25519PrivateKey, ed448.Ed448PrivateKey),
):
hash_alg = None
else:
hash_alg = hashes.SHA256()
builder = (
x509.CertificateBuilder()
.subject_name(
x509.Name([x509.NameAttribute(NameOID.COMMON_NAME, "PyCA CA")])
)
.issuer_name(
x509.Name([x509.NameAttribute(NameOID.COMMON_NAME, "PyCA CA")])
)
.public_key(issuer_private_key.public_key())
.serial_number(1)
.not_valid_before(datetime.datetime(2020, 1, 1))
.not_valid_after(datetime.datetime(2030, 1, 1))
)
ca = builder.sign(issuer_private_key, hash_alg)
builder = (
x509.CertificateBuilder()
.subject_name(
x509.Name([x509.NameAttribute(NameOID.COMMON_NAME, "leaf")])
)
.issuer_name(
x509.Name([x509.NameAttribute(NameOID.COMMON_NAME, "PyCA CA")])
)
.public_key(subject_private_key.public_key())
.serial_number(100)
.not_valid_before(datetime.datetime(2020, 1, 1))
.not_valid_after(datetime.datetime(2025, 1, 1))
)
cert = builder.sign(issuer_private_key, hash_alg)
return ca, cert
def _break_cert_sig(cert: x509.Certificate) -> x509.Certificate:
cert_bad_sig = bytearray(cert.public_bytes(serialization.Encoding.PEM))
# Break the sig by mutating 5 bytes. That's the base64 representation
# though so there's somewhere closer to 2**-32 probability of
# not breaking the sig. Spin that roulette wheel.
cert_bad_sig[-40:-35] = 90, 90, 90, 90, 90
return x509.load_pem_x509_certificate(bytes(cert_bad_sig))
def _check_cert_times(
cert: x509.Certificate,
not_valid_before: typing.Optional[datetime.datetime],
not_valid_after: typing.Optional[datetime.datetime],
) -> None:
if not_valid_before:
with pytest.warns(utils.DeprecatedIn42):
assert cert.not_valid_before == not_valid_before
assert cert.not_valid_before_utc == not_valid_before.replace(
tzinfo=datetime.timezone.utc
)
if not_valid_after:
with pytest.warns(utils.DeprecatedIn42):
assert cert.not_valid_after == not_valid_after
assert cert.not_valid_after_utc == not_valid_after.replace(
tzinfo=datetime.timezone.utc
)
def _check_crl_times(
crl: x509.CertificateRevocationList,
last_update: datetime.datetime,
next_update: datetime.datetime,
) -> None:
with pytest.warns(utils.DeprecatedIn42):
assert crl.last_update == last_update
assert crl.next_update == next_update
assert crl.last_update_utc == last_update.replace(
tzinfo=datetime.timezone.utc
)
assert crl.next_update_utc == next_update.replace(
tzinfo=datetime.timezone.utc
)
class TestCertificateRevocationList:
def test_load_pem_crl(self, backend):
crl = _load_cert(
os.path.join("x509", "custom", "crl_all_reasons.pem"),
x509.load_pem_x509_crl,
)
assert isinstance(crl, x509.CertificateRevocationList)
fingerprint = binascii.hexlify(crl.fingerprint(hashes.SHA1()))
assert fingerprint == b"191b3428bf9d0dafa4edd42bc98603e182614c57"
assert isinstance(crl.signature_hash_algorithm, hashes.SHA256)
assert (
crl.signature_algorithm_oid
== SignatureAlgorithmOID.RSA_WITH_SHA256
)
def test_load_der_crl(self, backend):
crl = _load_cert(
os.path.join("x509", "PKITS_data", "crls", "GoodCACRL.crl"),
x509.load_der_x509_crl,
)
assert isinstance(crl, x509.CertificateRevocationList)
fingerprint = binascii.hexlify(crl.fingerprint(hashes.SHA1()))
assert fingerprint == b"dd3db63c50f4c4a13e090f14053227cb1011a5ad"
assert isinstance(crl.signature_hash_algorithm, hashes.SHA256)
def test_load_large_crl(self, backend):
crl = _load_cert(
os.path.join("x509", "custom", "crl_almost_10k.pem"),
x509.load_pem_x509_crl,
)
assert len(crl) == 9999
def test_empty_crl_no_sequence(self, backend):
# The SEQUENCE for revoked certificates is optional so let's
# test that we handle it properly.
crl = _load_cert(
os.path.join("x509", "custom", "crl_empty_no_sequence.der"),
x509.load_der_x509_crl,
)
assert len(crl) == 0
with pytest.raises(IndexError):
crl[0]
assert crl.get_revoked_certificate_by_serial_number(12) is None
assert list(iter(crl)) == []
def test_invalid_pem(self, backend):
with pytest.raises(ValueError):
x509.load_pem_x509_crl(b"notacrl", backend)
pem_bytes = _load_cert(
os.path.join("x509", "custom", "valid_signature_cert.pem"),
lambda data: data,
)
with pytest.raises(ValueError):
x509.load_pem_x509_crl(pem_bytes, backend)
def test_invalid_der(self, backend):
with pytest.raises(ValueError):
x509.load_der_x509_crl(b"notacrl", backend)
def test_invalid_time(self, backend):
with pytest.raises(ValueError, match="TBSCertList::this_update"):
_load_cert(
os.path.join("x509", "custom", "crl_invalid_time.der"),
x509.load_der_x509_crl,
)
def test_unknown_signature_algorithm(self, backend):
crl = _load_cert(
os.path.join(
"x509", "custom", "crl_md2_unknown_crit_entry_ext.pem"
),
x509.load_pem_x509_crl,
)
with raises_unsupported_algorithm(None):
crl.signature_hash_algorithm
def test_invalid_version(self, backend):
with pytest.raises(x509.InvalidVersion):
_load_cert(
os.path.join("x509", "custom", "crl_bad_version.pem"),
x509.load_pem_x509_crl,
)
def test_issuer(self, backend):
crl = _load_cert(
os.path.join("x509", "PKITS_data", "crls", "GoodCACRL.crl"),
x509.load_der_x509_crl,
)
assert isinstance(crl.issuer, x509.Name)
assert list(crl.issuer) == [
x509.NameAttribute(x509.OID_COUNTRY_NAME, "US"),
x509.NameAttribute(
x509.OID_ORGANIZATION_NAME, "Test Certificates 2011"
),
x509.NameAttribute(x509.OID_COMMON_NAME, "Good CA"),
]
assert crl.issuer.get_attributes_for_oid(x509.OID_COMMON_NAME) == [
x509.NameAttribute(x509.OID_COMMON_NAME, "Good CA")
]
def test_equality(self, backend):
crl1 = _load_cert(
os.path.join("x509", "PKITS_data", "crls", "GoodCACRL.crl"),
x509.load_der_x509_crl,
)
crl2 = _load_cert(
os.path.join("x509", "PKITS_data", "crls", "GoodCACRL.crl"),
x509.load_der_x509_crl,
)
crl3 = _load_cert(
os.path.join("x509", "custom", "crl_all_reasons.pem"),
x509.load_pem_x509_crl,
)
assert crl1 == crl2
assert crl1 != crl3
assert crl1 != object()
def test_comparison(self, backend):
crl1 = _load_cert(
os.path.join("x509", "PKITS_data", "crls", "GoodCACRL.crl"),
x509.load_der_x509_crl,
)
with pytest.raises(TypeError):
crl1 < crl1 # type: ignore[operator]
def test_update_dates(self, backend):
crl = _load_cert(
os.path.join("x509", "custom", "crl_all_reasons.pem"),
x509.load_pem_x509_crl,
)
with pytest.warns(utils.DeprecatedIn42):
assert isinstance(crl.next_update, datetime.datetime)
assert isinstance(crl.last_update, datetime.datetime)
assert crl.next_update.isoformat() == "2016-01-01T00:00:00"
assert crl.last_update.isoformat() == "2015-01-01T00:00:00"
assert isinstance(crl.next_update_utc, datetime.datetime)
assert isinstance(crl.last_update_utc, datetime.datetime)
assert crl.next_update_utc.isoformat() == "2016-01-01T00:00:00+00:00"
assert crl.last_update_utc.isoformat() == "2015-01-01T00:00:00+00:00"
def test_no_next_update(self, backend):
crl = _load_cert(
os.path.join("x509", "custom", "crl_no_next_update.pem"),
x509.load_pem_x509_crl,
)
with pytest.warns(utils.DeprecatedIn42):
assert crl.next_update is None
assert crl.next_update_utc is None
def test_unrecognized_extension(self, backend):
crl = _load_cert(
os.path.join("x509", "custom", "crl_unrecognized_extension.der"),
x509.load_der_x509_crl,
)
unrecognized = x509.UnrecognizedExtension(
x509.ObjectIdentifier("1.2.3.4.5"),
b"abcdef",
)
ext = crl.extensions.get_extension_for_oid(unrecognized.oid)
assert ext.value == unrecognized
def test_revoked_cert_retrieval(self, backend):
crl = _load_cert(
os.path.join("x509", "custom", "crl_all_reasons.pem"),
x509.load_pem_x509_crl,
)
for r in crl:
assert isinstance(r, x509.RevokedCertificate)
# Check that len() works for CRLs.
assert len(crl) == 12
it = iter(crl)
assert len(typing.cast(typing.Sized, it)) == 12
next(it)
assert len(typing.cast(typing.Sized, it)) == 11
def test_get_revoked_certificate_by_serial_number(self, backend):
crl = _load_cert(
os.path.join(
"x509", "PKITS_data", "crls", "LongSerialNumberCACRL.crl"
),
x509.load_der_x509_crl,
)
serial_number = 725064303890588110203033396814564464046290047507
revoked = crl.get_revoked_certificate_by_serial_number(serial_number)
assert isinstance(revoked, x509.RevokedCertificate)
assert revoked.serial_number == serial_number
assert crl.get_revoked_certificate_by_serial_number(500) is None
def test_revoked_cert_retrieval_retain_only_revoked(self, backend):
"""
This test attempts to trigger the crash condition described in
https://github.com/pyca/cryptography/issues/2557
PyPy does gc at its own pace, so it will only be reliable on CPython.
"""
revoked = _load_cert(
os.path.join("x509", "custom", "crl_all_reasons.pem"),
x509.load_pem_x509_crl,
)[11]
with pytest.warns(utils.DeprecatedIn42):
assert revoked.revocation_date == datetime.datetime(
2015, 1, 1, 0, 0
)
assert revoked.revocation_date_utc == datetime.datetime(
2015, 1, 1, 0, 0, tzinfo=datetime.timezone.utc
)
assert revoked.serial_number == 11
def test_extensions(self, backend):
crl = _load_cert(
os.path.join("x509", "custom", "crl_ian_aia_aki.pem"),
x509.load_pem_x509_crl,
)
crl_number = crl.extensions.get_extension_for_oid(
ExtensionOID.CRL_NUMBER
)
aki = crl.extensions.get_extension_for_class(
x509.AuthorityKeyIdentifier
)
aia = crl.extensions.get_extension_for_class(
x509.AuthorityInformationAccess
)
ian = crl.extensions.get_extension_for_class(
x509.IssuerAlternativeName
)
assert crl_number.value == x509.CRLNumber(1)
assert crl_number.critical is False
assert aki.value == x509.AuthorityKeyIdentifier(
key_identifier=(b"yu\xbb\x84:\xcb,\xdez\t\xbe1\x1bC\xbc\x1c*MSX"),
authority_cert_issuer=None,
authority_cert_serial_number=None,
)
assert aia.value == x509.AuthorityInformationAccess(
[
x509.AccessDescription(
AuthorityInformationAccessOID.CA_ISSUERS,
x509.DNSName("cryptography.io"),
)
]
)
assert ian.value == x509.IssuerAlternativeName(
[x509.UniformResourceIdentifier("https://cryptography.io")]
)
def test_delta_crl_indicator(self, backend):
crl = _load_cert(
os.path.join("x509", "custom", "crl_delta_crl_indicator.pem"),
x509.load_pem_x509_crl,
)
dci = crl.extensions.get_extension_for_oid(
ExtensionOID.DELTA_CRL_INDICATOR
)
assert dci.value == x509.DeltaCRLIndicator(12345678901234567890)
assert dci.critical is True
def test_signature(self, backend):
crl = _load_cert(
os.path.join("x509", "custom", "crl_all_reasons.pem"),
x509.load_pem_x509_crl,
)
assert crl.signature == binascii.unhexlify(
b"536a5a0794f68267361e7bc2f19167a3e667a2ab141535616855d8deb2ba1af"
b"9fd4546b1fe76b454eb436af7b28229fedff4634dfc9dd92254266219ae0ea8"
b"75d9ff972e9a2da23d5945f073da18c50a4265bfed9ca16586347800ef49dd1"
b"6856d7265f4f3c498a57f04dc04404e2bd2e2ada1f5697057aacef779a18371"
b"c621edc9a5c2b8ec1716e8fa22feeb7fcec0ce9156c8d344aa6ae8d1a5d99d0"
b"9386df36307df3b63c83908f4a61a0ff604c1e292ad63b349d1082ddd7ae1b7"
b"c178bba995523ec6999310c54da5706549797bfb1230f5593ba7b4353dade4f"
b"d2be13a57580a6eb20b5c4083f000abac3bf32cd8b75f23e4c8f4b3a79e1e2d"
b"58a472b0"
)
def test_tbs_certlist_bytes(self, backend):
crl = _load_cert(
os.path.join("x509", "PKITS_data", "crls", "GoodCACRL.crl"),
x509.load_der_x509_crl,
)
ca_cert = _load_cert(
os.path.join("x509", "PKITS_data", "certs", "GoodCACert.crt"),
x509.load_der_x509_certificate,
)
public_key = ca_cert.public_key()
assert isinstance(public_key, rsa.RSAPublicKey)
assert crl.signature_hash_algorithm is not None
public_key.verify(
crl.signature,
crl.tbs_certlist_bytes,
padding.PKCS1v15(),
crl.signature_hash_algorithm,
)
def test_public_bytes_pem(self, backend):
crl = _load_cert(
os.path.join("x509", "custom", "crl_empty.pem"),
x509.load_pem_x509_crl,
)
# Encode it to PEM and load it back.
crl = x509.load_pem_x509_crl(
crl.public_bytes(
encoding=serialization.Encoding.PEM,
),
)
assert len(crl) == 0
_check_crl_times(
crl,
last_update=datetime.datetime(2015, 12, 20, 23, 44, 47),
next_update=datetime.datetime(2015, 12, 28, 0, 44, 47),
)
def test_public_bytes_der(self, backend):
crl = _load_cert(
os.path.join("x509", "custom", "crl_all_reasons.pem"),
x509.load_pem_x509_crl,
)
# Encode it to DER and load it back.
crl = x509.load_der_x509_crl(
crl.public_bytes(
encoding=serialization.Encoding.DER,
),
)
assert len(crl) == 12
_check_crl_times(
crl,
last_update=datetime.datetime(2015, 1, 1, 0, 0, 0),
next_update=datetime.datetime(2016, 1, 1, 0, 0, 0),
)
@pytest.mark.parametrize(
("cert_path", "loader_func", "encoding"),
[
(
os.path.join("x509", "custom", "crl_all_reasons.pem"),
x509.load_pem_x509_crl,
serialization.Encoding.PEM,
),
(
os.path.join("x509", "PKITS_data", "crls", "GoodCACRL.crl"),
x509.load_der_x509_crl,
serialization.Encoding.DER,
),
],
)
def test_public_bytes_match(
self, cert_path, loader_func, encoding, backend
):
crl_bytes = load_vectors_from_file(
cert_path, lambda pemfile: pemfile.read(), mode="rb"
)
crl = loader_func(crl_bytes, backend)
serialized = crl.public_bytes(encoding)
assert serialized == crl_bytes
def test_public_bytes_invalid_encoding(self, backend):
crl = _load_cert(
os.path.join("x509", "custom", "crl_empty.pem"),
x509.load_pem_x509_crl,
)
with pytest.raises(TypeError):
crl.public_bytes("NotAnEncoding") # type: ignore[arg-type]
def test_verify_bad(self, backend):
crl = _load_cert(
os.path.join("x509", "custom", "invalid_signature_crl.pem"),
x509.load_pem_x509_crl,
)
crt = _load_cert(
os.path.join("x509", "custom", "invalid_signature_cert.pem"),
x509.load_pem_x509_certificate,
)
public_key = crt.public_key()
assert isinstance(public_key, rsa.RSAPublicKey)
assert not crl.is_signature_valid(public_key)
crl = _load_cert(
os.path.join("x509", "custom", "crl_inner_outer_mismatch.der"),
x509.load_der_x509_crl,
)
assert not crl.is_signature_valid(public_key)
def test_verify_good(self, backend):
crl = _load_cert(
os.path.join("x509", "custom", "valid_signature_crl.pem"),
x509.load_pem_x509_crl,
)
crt = _load_cert(
os.path.join("x509", "custom", "valid_signature_cert.pem"),
x509.load_pem_x509_certificate,
)
public_key = crt.public_key()
assert isinstance(public_key, rsa.RSAPublicKey)
assert crl.is_signature_valid(public_key)
def test_verify_argument_must_be_a_public_key(self, backend):
crl = _load_cert(
os.path.join("x509", "custom", "valid_signature_crl.pem"),
x509.load_pem_x509_crl,
)
with pytest.raises(TypeError):
crl.is_signature_valid(
"not a public key" # type: ignore[arg-type]
)
with pytest.raises(TypeError):
crl.is_signature_valid(object) # type: ignore[arg-type]
class TestRevokedCertificate:
def test_revoked_basics(self, backend):
crl = _load_cert(
os.path.join("x509", "custom", "crl_all_reasons.pem"),
x509.load_pem_x509_crl,
)
for i, rev in enumerate(crl):
assert isinstance(rev, x509.RevokedCertificate)
assert isinstance(rev.serial_number, int)
with pytest.warns(utils.DeprecatedIn42):
assert isinstance(rev.revocation_date, datetime.datetime)
assert isinstance(rev.revocation_date_utc, datetime.datetime)
assert isinstance(rev.extensions, x509.Extensions)
assert rev.serial_number == i
with pytest.warns(utils.DeprecatedIn42):
assert rev.revocation_date.isoformat() == "2015-01-01T00:00:00"
assert (
rev.revocation_date_utc.isoformat()
== "2015-01-01T00:00:00+00:00"
)
def test_revoked_extensions(self, backend):
crl = _load_cert(
os.path.join("x509", "custom", "crl_all_reasons.pem"),
x509.load_pem_x509_crl,
)
exp_issuer = [
x509.DirectoryName(
x509.Name(
[
x509.NameAttribute(x509.OID_COUNTRY_NAME, "US"),
x509.NameAttribute(
x509.OID_COMMON_NAME, "cryptography.io"
),
]
)
)
]
# First revoked cert doesn't have extensions, test if it is handled
# correctly.
rev0 = crl[0]
# It should return an empty Extensions object.
assert isinstance(rev0.extensions, x509.Extensions)
assert len(rev0.extensions) == 0
with pytest.raises(x509.ExtensionNotFound):
rev0.extensions.get_extension_for_oid(x509.OID_CRL_REASON)
with pytest.raises(x509.ExtensionNotFound):
rev0.extensions.get_extension_for_oid(x509.OID_CERTIFICATE_ISSUER)
with pytest.raises(x509.ExtensionNotFound):
rev0.extensions.get_extension_for_oid(x509.OID_INVALIDITY_DATE)
# Test manual retrieval of extension values.
rev1 = crl[1]
assert isinstance(rev1.extensions, x509.Extensions)
reason = rev1.extensions.get_extension_for_class(x509.CRLReason).value
assert reason == x509.CRLReason(x509.ReasonFlags.unspecified)
issuer = rev1.extensions.get_extension_for_class(
x509.CertificateIssuer
).value
assert issuer == x509.CertificateIssuer(exp_issuer)
date = rev1.extensions.get_extension_for_class(
x509.InvalidityDate
).value
assert date == x509.InvalidityDate(datetime.datetime(2015, 1, 1, 0, 0))
# Check if all reason flags can be found in the CRL.
flags = set(x509.ReasonFlags)
for rev in crl:
try:
r = rev.extensions.get_extension_for_class(x509.CRLReason)
except x509.ExtensionNotFound:
# Not all revoked certs have a reason extension.
pass
else:
flags.discard(r.value.reason)
assert len(flags) == 0
def test_no_revoked_certs(self, backend):
crl = _load_cert(
os.path.join("x509", "custom", "crl_empty.pem"),
x509.load_pem_x509_crl,
)
assert len(crl) == 0
def test_duplicate_entry_ext(self, backend):
crl = _load_cert(
os.path.join("x509", "custom", "crl_dup_entry_ext.pem"),
x509.load_pem_x509_crl,
)
with pytest.raises(x509.DuplicateExtension):
crl[0].extensions
def test_unsupported_crit_entry_ext(self, backend):
crl = _load_cert(
os.path.join(
"x509", "custom", "crl_md2_unknown_crit_entry_ext.pem"
),
x509.load_pem_x509_crl,
)
ext = crl[0].extensions.get_extension_for_oid(
x509.ObjectIdentifier("1.2.3.4")
)
assert isinstance(ext.value, x509.UnrecognizedExtension)
assert ext.value.value == b"\n\x01\x00"
def test_unsupported_reason(self, backend):
crl = _load_cert(
os.path.join("x509", "custom", "crl_unsupported_reason.pem"),
x509.load_pem_x509_crl,
)
with pytest.raises(ValueError):
crl[0].extensions
def test_invalid_cert_issuer_ext(self, backend):
crl = _load_cert(
os.path.join(
"x509", "custom", "crl_inval_cert_issuer_entry_ext.pem"
),
x509.load_pem_x509_crl,
)
with pytest.raises(ValueError):
crl[0].extensions
def test_indexing(self, backend):
crl = _load_cert(
os.path.join("x509", "custom", "crl_all_reasons.pem"),
x509.load_pem_x509_crl,
)
with pytest.raises(IndexError):
crl[-13]
with pytest.raises(IndexError):
crl[12]
assert crl[-1].serial_number == crl[11].serial_number
assert len(crl[2:4]) == 2
assert crl[2:4][0].serial_number == crl[2].serial_number
assert crl[2:4][1].serial_number == crl[3].serial_number
def test_get_revoked_certificate_doesnt_reorder(
self, rsa_key_2048: rsa.RSAPrivateKey, backend
):
private_key = rsa_key_2048
last_update = datetime.datetime(2002, 1, 1, 12, 1)
next_update = datetime.datetime(2030, 1, 1, 12, 1)
builder = (
x509.CertificateRevocationListBuilder()
.issuer_name(
x509.Name(
[
x509.NameAttribute(
NameOID.COMMON_NAME, "cryptography.io CA"
)
]
)
)
.last_update(last_update)
.next_update(next_update)
)
for i in [2, 500, 3, 49, 7, 1]:
revoked_cert = (
x509.RevokedCertificateBuilder()
.serial_number(i)
.revocation_date(datetime.datetime(2012, 1, 1, 1, 1))
.build(backend)
)
builder = builder.add_revoked_certificate(revoked_cert)
crl = builder.sign(private_key, hashes.SHA256(), backend)
assert crl[0].serial_number == 2
assert crl[2].serial_number == 3
# make sure get_revoked_certificate_by_serial_number doesn't affect
# ordering after being invoked
crl.get_revoked_certificate_by_serial_number(500)
assert crl[0].serial_number == 2
assert crl[2].serial_number == 3
class TestRSAPSSCertificate:
def test_load_cert_pub_key(self, backend):
cert = _load_cert(
os.path.join("x509", "custom", "rsa_pss_cert.pem"),
x509.load_pem_x509_certificate,
)
assert isinstance(cert, x509.Certificate)
expected_pub_key = _load_cert(
os.path.join("asymmetric", "PKCS8", "rsa_pss_2048_pub.der"),
serialization.load_der_public_key,
)
assert isinstance(expected_pub_key, rsa.RSAPublicKey)
pub_key = cert.public_key()
assert isinstance(pub_key, rsa.RSAPublicKey)
assert pub_key == expected_pub_key
pss = cert.signature_algorithm_parameters
assert isinstance(pss, padding.PSS)
assert isinstance(pss._mgf, padding.MGF1)
assert isinstance(pss._mgf._algorithm, hashes.SHA256)
assert pss._salt_length == 222
assert isinstance(cert.signature_hash_algorithm, hashes.SHA256)
pub_key.verify(
cert.signature,
cert.tbs_certificate_bytes,
pss,
cert.signature_hash_algorithm,
)
def test_load_pss_cert_no_null(self, backend):
"""
This test verifies that PSS certs where the hash algorithm
identifiers have no trailing null still load properly. LibreSSL
generates certs like this.
"""
cert = _load_cert(
os.path.join("x509", "custom", "rsa_pss_sha256_no_null.pem"),
x509.load_pem_x509_certificate,
)
assert isinstance(cert, x509.Certificate)
pss = cert.signature_algorithm_parameters
assert isinstance(pss, padding.PSS)
assert isinstance(pss._mgf, padding.MGF1)
assert isinstance(pss._mgf._algorithm, hashes.SHA256)
assert isinstance(cert.signature_hash_algorithm, hashes.SHA256)
def test_load_pss_sha1_mgf1_sha1(self, backend):
cert = _load_cert(
os.path.join("x509", "ee-pss-sha1-cert.pem"),
x509.load_pem_x509_certificate,
)
assert isinstance(cert, x509.Certificate)
pub_key = cert.public_key()
assert isinstance(pub_key, rsa.RSAPublicKey)
pss = cert.signature_algorithm_parameters
assert isinstance(pss, padding.PSS)
assert isinstance(pss._mgf, padding.MGF1)
assert isinstance(pss._mgf._algorithm, hashes.SHA1)
assert pss._salt_length == 20
assert isinstance(cert.signature_hash_algorithm, hashes.SHA1)
def test_invalid_mgf(self, backend):
cert = _load_cert(
os.path.join("x509", "custom", "rsa_pss_cert_invalid_mgf.der"),
x509.load_der_x509_certificate,
)
with pytest.raises(ValueError):
cert.signature_algorithm_parameters
def test_unsupported_mgf_hash(self, backend):
cert = _load_cert(
os.path.join(
"x509", "custom", "rsa_pss_cert_unsupported_mgf_hash.der"
),
x509.load_der_x509_certificate,
)
with pytest.raises(UnsupportedAlgorithm):
cert.signature_algorithm_parameters
def test_no_sig_params(self, backend):
cert = _load_cert(
os.path.join("x509", "custom", "rsa_pss_cert_no_sig_params.der"),
x509.load_der_x509_certificate,
)
with pytest.raises(ValueError):
cert.signature_algorithm_parameters
with pytest.raises(ValueError):
cert.signature_hash_algorithm
class TestRSACertificate:
def test_load_pem_cert(self, backend):
cert = _load_cert(
os.path.join("x509", "custom", "post2000utctime.pem"),
x509.load_pem_x509_certificate,
)
assert isinstance(cert, x509.Certificate)
assert cert.serial_number == 11559813051657483483
fingerprint = binascii.hexlify(cert.fingerprint(hashes.SHA1()))
assert fingerprint == b"2b619ed04bfc9c3b08eb677d272192286a0947a8"
assert isinstance(cert.signature_hash_algorithm, hashes.SHA1)
assert (
cert.signature_algorithm_oid == SignatureAlgorithmOID.RSA_WITH_SHA1
)
assert isinstance(
cert.signature_algorithm_parameters, padding.PKCS1v15
)
def test_check_pkcs1_signature_algorithm_parameters(self, backend):
cert = _load_cert(
os.path.join("x509", "custom", "ca", "rsa_ca.pem"),
x509.load_pem_x509_certificate,
)
assert isinstance(cert, x509.Certificate)
assert isinstance(
cert.signature_algorithm_parameters, padding.PKCS1v15
)
pk = cert.public_key()
assert isinstance(pk, rsa.RSAPublicKey)
assert cert.signature_hash_algorithm is not None
pk.verify(
cert.signature,
cert.tbs_certificate_bytes,
cert.signature_algorithm_parameters,
cert.signature_hash_algorithm,
)
def test_load_legacy_pem_header(self, backend):
cert = _load_cert(
os.path.join("x509", "cryptography.io.old_header.pem"),
x509.load_pem_x509_certificate,
)
assert isinstance(cert, x509.Certificate)
def test_load_with_other_sections(self, backend):
cert = _load_cert(
os.path.join("x509", "cryptography.io.with_garbage.pem"),
x509.load_pem_x509_certificate,
)
assert isinstance(cert, x509.Certificate)
cert = _load_cert(
os.path.join("x509", "cryptography.io.with_headers.pem"),
x509.load_pem_x509_certificate,
)
assert isinstance(cert, x509.Certificate)
def test_load_multiple_sections(self, backend):
# We match OpenSSL's behavior of loading the first cert
# if there are multiple. Arguably this would ideally be an
# error, but "load the first" is a common expectation.
cert = _load_cert(
os.path.join("x509", "cryptography.io.chain.pem"),
x509.load_pem_x509_certificate,
)
cert2 = _load_cert(
os.path.join("x509", "cryptography.io.pem"),
x509.load_pem_x509_certificate,
)
assert cert == cert2
def test_negative_serial_number(self, backend):
# We load certificates with negative serial numbers but on load
# and on access of the attribute we raise a warning
with pytest.warns(utils.DeprecatedIn36):
cert = _load_cert(
os.path.join("x509", "custom", "negative_serial.pem"),
x509.load_pem_x509_certificate,
)
with pytest.warns(utils.DeprecatedIn36):
assert cert.serial_number == -18008675309
def test_country_jurisdiction_country_too_long(self, backend):
cert = _load_cert(
os.path.join("x509", "custom", "bad_country.pem"),
x509.load_pem_x509_certificate,
)
with pytest.warns(UserWarning):
assert (
cert.subject.get_attributes_for_oid(x509.NameOID.COUNTRY_NAME)[
0
].value
== "too long"
)
with pytest.warns(UserWarning):
assert (
cert.subject.get_attributes_for_oid(
x509.NameOID.JURISDICTION_COUNTRY_NAME
)[0].value
== "also too long"
)
def test_alternate_rsa_with_sha1_oid(self, backend):
cert = _load_cert(
os.path.join("x509", "custom", "alternate-rsa-sha1-oid.der"),
x509.load_der_x509_certificate,
)
assert isinstance(cert.signature_hash_algorithm, hashes.SHA1)
assert (
cert.signature_algorithm_oid
== SignatureAlgorithmOID._RSA_WITH_SHA1
)
def test_load_bmpstring_explicittext(self, backend):
cert = _load_cert(