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setup.py
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141 lines (125 loc) · 4.52 KB
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import datetime
from pathlib import Path
from cryptography import x509
from cryptography.hazmat._oid import NameOID
from cryptography.hazmat.primitives import serialization, hashes
from cryptography.hazmat.primitives.asymmetric import rsa
ca_key_passphrase = b'supersecretpassphrase'
def create_ca():
ca_dir = Path('ca')
ca_dir.mkdir(parents=True, exist_ok=True)
ca_key = rsa.generate_private_key(
public_exponent=65537,
key_size=4096
)
with open(ca_dir.joinpath('ca.key'), 'wb') as f:
f.write(ca_key.private_bytes(
encoding=serialization.Encoding.PEM,
format=serialization.PrivateFormat.TraditionalOpenSSL,
encryption_algorithm=serialization.BestAvailableEncryption(ca_key_passphrase)
))
ca_subject = ca_issuer = x509.Name([
x509.NameAttribute(NameOID.COUNTRY_NAME, "DE"),
x509.NameAttribute(NameOID.STATE_OR_PROVINCE_NAME, "Sachsen-Anhalt"),
x509.NameAttribute(NameOID.LOCALITY_NAME, "Wernigerode"),
x509.NameAttribute(NameOID.ORGANIZATION_NAME, "Hochschule Harz"),
x509.NameAttribute(NameOID.ORGANIZATIONAL_UNIT_NAME, "Netlab"),
x509.NameAttribute(NameOID.COMMON_NAME, "Netlab Root CA")
])
ca_crt = x509.CertificateBuilder().subject_name(
ca_subject
).issuer_name(
ca_issuer
).public_key(
ca_key.public_key()
).serial_number(
x509.random_serial_number()
).not_valid_before(
datetime.datetime.now(datetime.timezone.utc)
).not_valid_after(
datetime.datetime.now(datetime.timezone.utc) + datetime.timedelta(days=3650)
).add_extension(
x509.SubjectAlternativeName([x509.DNSName("ca.netlab.hs-harz.de")]),
critical=False
).add_extension(
x509.BasicConstraints(True, 2),
critical=False
).add_extension(
x509.KeyUsage(
False,
False,
False,
False,
False,
True,
True,
False,
False
),
critical=False
).add_extension(
x509.SubjectKeyIdentifier.from_public_key(ca_key.public_key()),
critical=False
).sign(ca_key, hashes.SHA256())
with open(ca_dir.joinpath('ca.crt'), 'wb') as f:
f.write(ca_crt.public_bytes(serialization.Encoding.PEM))
intermediate_key = rsa.generate_private_key(
public_exponent=65537,
key_size=4096
)
with open(ca_dir.joinpath('intermediate.key'), 'wb') as f:
f.write(intermediate_key.private_bytes(
encoding=serialization.Encoding.PEM,
format=serialization.PrivateFormat.TraditionalOpenSSL,
encryption_algorithm=serialization.BestAvailableEncryption(ca_key_passphrase)
))
intermediate_subject = x509.Name([
x509.NameAttribute(NameOID.COUNTRY_NAME, "DE"),
x509.NameAttribute(NameOID.STATE_OR_PROVINCE_NAME, "Sachsen-Anhalt"),
x509.NameAttribute(NameOID.LOCALITY_NAME, "Wernigerode"),
x509.NameAttribute(NameOID.ORGANIZATION_NAME, "Hochschule Harz"),
x509.NameAttribute(NameOID.ORGANIZATIONAL_UNIT_NAME, "Netlab"),
x509.NameAttribute(NameOID.COMMON_NAME, "Netlab Intermediate CA")
])
intermediate_crt = x509.CertificateBuilder().subject_name(
intermediate_subject
).issuer_name(
ca_issuer
).public_key(
intermediate_key.public_key()
).serial_number(
x509.random_serial_number()
).not_valid_before(
datetime.datetime.now(datetime.timezone.utc)
).not_valid_after(
datetime.datetime.now(datetime.timezone.utc) + datetime.timedelta(days=3650)
).add_extension(
x509.SubjectAlternativeName([x509.DNSName("intermediate-ca.netlab.hs-harz.de")]),
critical=False
).add_extension(
x509.BasicConstraints(True, 1),
critical=False
).add_extension(
x509.KeyUsage(
False,
False,
False,
False,
False,
True,
True,
False,
False
),
critical=False
).add_extension(
x509.AuthorityKeyIdentifier.from_issuer_public_key(ca_key.public_key()),
critical=False
).add_extension(
x509.SubjectKeyIdentifier.from_public_key(intermediate_key.public_key()),
critical=False
).sign(ca_key, hashes.SHA256())
with open(ca_dir.joinpath('intermediate.crt'), 'wb') as f:
f.write(intermediate_crt.public_bytes(serialization.Encoding.PEM))
if __name__ == "__main__":
create_ca()