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import argparse
from pathlib import Path
from typing import List
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()
)
PUBLIC_KEY: ec.EllipticCurvePublicKey = PRIVATE_KEY.public_key()
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_cert(
name: str,
distribution_points: List[x509.DistributionPoint],
) -> x509.Certificate:
cert_builder: x509.CertificateBuilder = x509.CertificateBuilder()
cert_builder = cert_builder.subject_name(subject_name(name))
cert_builder = cert_builder.issuer_name(subject_name(name))
cert_builder = cert_builder.not_valid_before(NOT_BEFORE)
cert_builder = cert_builder.not_valid_after(NOT_AFTER)
cert_builder = cert_builder.serial_number(x509.random_serial_number())
cert_builder = cert_builder.public_key(PUBLIC_KEY)
cert_builder = cert_builder.add_extension(
x509.CRLDistributionPoints(distribution_points), critical=False
)
return cert_builder.sign(
private_key=PRIVATE_KEY,
algorithm=hashes.SHA256(),
backend=default_backend(),
)
def with_reasons() -> None:
name = "with_reasons"
write_der(
f"{name}.der",
generate_cert(
name,
[
x509.DistributionPoint(
full_name=[
x509.UniformResourceIdentifier("http://example.com/crl.der")
],
reasons=frozenset(
[
x509.ReasonFlags.key_compromise,
x509.ReasonFlags.affiliation_changed,
]
),
relative_name=None,
crl_issuer=None,
),
],
).public_bytes(Encoding.DER),
args.force,
)
def with_crl_issuer() -> None:
name = "with_crl_issuer"
write_der(
f"{name}.der",
generate_cert(
name,
[
x509.DistributionPoint(
full_name=None,
reasons=None,
relative_name=None,
crl_issuer=[
x509.DirectoryName(
x509.Name(
[
x509.NameAttribute(
NameOID.COMMON_NAME,
"crl-distrib-point-test.example.com",
),
]
)
)
],
),
],
).public_bytes(Encoding.DER),
args.force,
)
def with_relative_name() -> None:
name = "dp_name_relative_to_issuer"
write_der(
f"{name}.der",
generate_cert(
name,
[
x509.DistributionPoint(
full_name=None,
reasons=None,
relative_name=x509.RelativeDistinguishedName(
[x509.NameAttribute(NameOID.COMMON_NAME, "example.com")]
),
crl_issuer=None,
),
],
).public_bytes(Encoding.DER),
args.force,
)
def with_multiple() -> None:
name = "multiple_distribution_points"
write_der(
f"{name}.der",
generate_cert(
name,
[
x509.DistributionPoint(
full_name=[
x509.UniformResourceIdentifier("http://example.com/crl.1.der")
],
reasons=None,
relative_name=None,
crl_issuer=None,
),
x509.DistributionPoint(
full_name=[
x509.UniformResourceIdentifier("http://example.com/crl.2.der"),
x509.UniformResourceIdentifier("http://example.com/crl.3.der"),
],
reasons=None,
relative_name=None,
crl_issuer=None,
),
],
).public_bytes(Encoding.DER),
args.force,
)
if __name__ == "__main__":
parser = argparse.ArgumentParser()
parser.add_argument(
"--with-reasons",
action=argparse.BooleanOptionalAction,
default=True,
help="Generate a certificate with CRL distribution point with reason codes.",
)
parser.add_argument(
"--with-crl-issuer",
action=argparse.BooleanOptionalAction,
default=True,
help="Generate a certificate with CRL distribution point with cRLIssuer.",
)
parser.add_argument(
"--with-name-relative-to-issuer",
action=argparse.BooleanOptionalAction,
default=True,
help="Generate a certificate with CRL distribution point name relative to issuer.",
)
parser.add_argument(
"--multiple-distribution-points",
action=argparse.BooleanOptionalAction,
default=True,
help="Generate a certificate with multiple CRL distribution points.",
)
parser.add_argument(
"--force",
action=argparse.BooleanOptionalAction,
default=False,
help="Overwrite existing certs",
)
args = parser.parse_args()
if args.with_reasons:
with_reasons()
if args.with_crl_issuer:
with_crl_issuer()
if args.with_name_relative_to_issuer:
with_relative_name()
if args.multiple_distribution_points:
with_multiple()
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