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import argparse
from pathlib import Path
from cryptography import x509
from cryptography.hazmat.primitives import hashes
from cryptography.hazmat.primitives.asymmetric import ec
from cryptography.hazmat.primitives.serialization import Encoding
from cryptography.hazmat.backends import default_backend
from cryptography.x509.oid import NameOID
import datetime
NOT_BEFORE: datetime.datetime = datetime.datetime.utcfromtimestamp(0x1FEDF00D - 30)
NOT_AFTER: datetime.datetime = datetime.datetime.utcfromtimestamp(0x1FEDF00D + 30)
PRIVATE_KEY: ec.EllipticCurvePrivateKey = ec.generate_private_key(
ec.SECP256R1(), default_backend()
)
EG_URI: x509.UniformResourceIdentifier = x509.UniformResourceIdentifier(
"http://example.com/crl.1.der"
)
def write_der(path: str, content: bytes, force: bool) -> None:
# Avoid churn from regenerating existing on-disk resources unless force is enabled.
out_path = Path(path)
if out_path.exists() and not force:
return None
with out_path.open("wb") as f:
f.write(content)
def subject_name(test_name: str) -> x509.Name:
return x509.Name(
[
x509.NameAttribute(
NameOID.COMMON_NAME, "crl-distrib-point-test.example.com"
),
x509.NameAttribute(NameOID.ORGANIZATION_NAME, test_name),
]
)
def generate_crl(
name: str,
issuing_distribution_point: x509.IssuingDistributionPoint,
) -> x509.CertificateRevocationList:
crl_builder: x509.CertificateRevocationListBuilder = (
x509.CertificateRevocationListBuilder()
)
crl_builder = crl_builder.issuer_name(subject_name(name))
crl_builder = crl_builder.last_update(NOT_BEFORE)
crl_builder = crl_builder.next_update(NOT_AFTER)
crl_builder = crl_builder.add_extension(
x509.CRLNumber(x509.random_serial_number()), critical=False
)
crl_builder = crl_builder.add_extension(issuing_distribution_point, critical=True)
return crl_builder.sign(
private_key=PRIVATE_KEY,
algorithm=hashes.SHA256(),
)
def only_user_certs() -> None:
name = "only_user_certs"
write_der(
f"crl.idp.{name}.der",
generate_crl(
name,
x509.IssuingDistributionPoint(
only_contains_user_certs=True,
only_contains_ca_certs=False,
indirect_crl=False,
only_contains_attribute_certs=False,
only_some_reasons=None,
full_name=[EG_URI],
relative_name=None,
),
).public_bytes(Encoding.DER),
args.force,
)
def only_ca_certs() -> None:
name = "only_ca_certs"
write_der(
f"crl.idp.{name}.der",
generate_crl(
name,
x509.IssuingDistributionPoint(
only_contains_user_certs=False,
only_contains_ca_certs=True,
indirect_crl=False,
only_contains_attribute_certs=False,
only_some_reasons=None,
full_name=[EG_URI],
relative_name=None,
),
).public_bytes(Encoding.DER),
args.force,
)
def indirect_crl() -> None:
name = "indirect_crl"
write_der(
f"crl.idp.{name}.der",
generate_crl(
name,
x509.IssuingDistributionPoint(
only_contains_user_certs=False,
only_contains_ca_certs=False,
indirect_crl=True,
only_contains_attribute_certs=False,
only_some_reasons=None,
full_name=[EG_URI],
relative_name=None,
),
).public_bytes(Encoding.DER),
args.force,
)
def only_attribute_certs() -> None:
name = "only_attribute_certs"
write_der(
f"crl.idp.{name}.der",
generate_crl(
name,
x509.IssuingDistributionPoint(
only_contains_user_certs=False,
only_contains_ca_certs=False,
indirect_crl=False,
only_contains_attribute_certs=True,
only_some_reasons=None,
full_name=[EG_URI],
relative_name=None,
),
).public_bytes(Encoding.DER),
args.force,
)
def only_some_reasons() -> None:
name = "only_some_reasons"
write_der(
f"crl.idp.{name}.der",
generate_crl(
name,
x509.IssuingDistributionPoint(
only_contains_user_certs=False,
only_contains_ca_certs=False,
indirect_crl=False,
only_contains_attribute_certs=False,
only_some_reasons=frozenset(
[
x509.ReasonFlags.key_compromise,
x509.ReasonFlags.affiliation_changed,
]
),
full_name=[EG_URI],
relative_name=None,
),
).public_bytes(Encoding.DER),
args.force,
)
def name_relative_to_issuer() -> None:
name = "name_relative_to_issuer"
write_der(
f"crl.idp.{name}.der",
generate_crl(
name,
x509.IssuingDistributionPoint(
only_contains_user_certs=False,
only_contains_ca_certs=False,
indirect_crl=False,
only_contains_attribute_certs=False,
only_some_reasons=None,
full_name=None,
relative_name=x509.RelativeDistinguishedName(
[x509.NameAttribute(NameOID.COMMON_NAME, "example.com")]
),
),
).public_bytes(Encoding.DER),
args.force,
)
def no_distribution_point_name() -> None:
name = "no_distribution_point_name"
write_der(
f"crl.idp.{name}.der",
generate_crl(
name,
x509.IssuingDistributionPoint(
only_contains_user_certs=True,
only_contains_ca_certs=False,
indirect_crl=False,
only_contains_attribute_certs=False,
only_some_reasons=None,
full_name=None,
relative_name=None,
),
).public_bytes(Encoding.DER),
args.force,
)
if __name__ == "__main__":
parser = argparse.ArgumentParser()
parser.add_argument(
"--with-only-user-certs",
action=argparse.BooleanOptionalAction,
default=True,
help="Generate CRL with only user certificates.",
)
parser.add_argument(
"--with-only-ca-certs",
action=argparse.BooleanOptionalAction,
default=True,
help="Generate CRL with only CA certificates.",
)
parser.add_argument(
"--with-indirect-crl",
action=argparse.BooleanOptionalAction,
default=True,
help="Generate CRL marked as an indirect CRL",
)
parser.add_argument(
"--with-only-attribute-certs",
action=argparse.BooleanOptionalAction,
default=True,
help="Generate CRL with only attribute certificates.",
)
parser.add_argument(
"--with-only-some-reasons",
action=argparse.BooleanOptionalAction,
default=True,
help="Generate CRL with only some revocation reasons in-scope.",
)
parser.add_argument(
"--with-name-relative-to-issuer",
action=argparse.BooleanOptionalAction,
default=True,
help="Generate CRL with IDP extension with distribution point name relative to issuer",
)
parser.add_argument(
"--with-no-distribution-point-name",
action=argparse.BooleanOptionalAction,
default=True,
help="Generate CRL with IDP extension withno distribution point name",
)
parser.add_argument(
"--force",
action=argparse.BooleanOptionalAction,
default=False,
help="Overwrite existing certs",
)
args = parser.parse_args()
if args.with_only_user_certs:
only_user_certs()
if args.with_only_ca_certs:
only_ca_certs()
if args.with_indirect_crl:
indirect_crl()
if args.with_only_attribute_certs:
only_attribute_certs()
if args.with_only_some_reasons:
only_some_reasons()
if args.with_name_relative_to_issuer:
name_relative_to_issuer()
if args.with_no_distribution_point_name:
no_distribution_point_name()
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