101 lines
3.5 KiB
Python
101 lines
3.5 KiB
Python
"""Create self-signed certificates"""
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import datetime
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import uuid
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from typing import Optional
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from cryptography import x509
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from cryptography.hazmat.backends import default_backend
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from cryptography.hazmat.primitives import hashes, serialization
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from cryptography.hazmat.primitives.asymmetric import rsa
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from cryptography.x509.oid import NameOID
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from authentik import __version__
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from authentik.crypto.models import CertificateKeyPair
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class CertificateBuilder:
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"""Build self-signed certificates"""
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common_name: str
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def __init__(self):
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self.__public_key = None
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self.__private_key = None
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self.__builder = None
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self.__certificate = None
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self.common_name = "authentik Self-signed Certificate"
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def save(self) -> Optional[CertificateKeyPair]:
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"""Save generated certificate as model"""
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if not self.__certificate:
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raise ValueError("Certificated hasn't been built yet")
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return CertificateKeyPair.objects.create(
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name=self.common_name,
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certificate_data=self.certificate,
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key_data=self.private_key,
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)
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def build(
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self,
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validity_days: int = 365,
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subject_alt_names: Optional[list[str]] = None,
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):
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"""Build self-signed certificate"""
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one_day = datetime.timedelta(1, 0, 0)
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self.__private_key = rsa.generate_private_key(
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public_exponent=65537, key_size=2048, backend=default_backend()
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)
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self.__public_key = self.__private_key.public_key()
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alt_names: list[x509.GeneralName] = [x509.DNSName(x) for x in subject_alt_names or []]
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self.__builder = (
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x509.CertificateBuilder()
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.subject_name(
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x509.Name(
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[
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x509.NameAttribute(
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NameOID.COMMON_NAME,
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self.common_name,
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),
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x509.NameAttribute(NameOID.ORGANIZATION_NAME, "authentik"),
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x509.NameAttribute(NameOID.ORGANIZATIONAL_UNIT_NAME, "Self-signed"),
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]
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)
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)
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.issuer_name(
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x509.Name(
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[
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x509.NameAttribute(
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NameOID.COMMON_NAME,
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f"authentik {__version__}",
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),
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]
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)
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)
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.add_extension(x509.SubjectAlternativeName(alt_names), critical=True)
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.not_valid_before(datetime.datetime.today() - one_day)
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.not_valid_after(datetime.datetime.today() + datetime.timedelta(days=validity_days))
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.serial_number(int(uuid.uuid4()))
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.public_key(self.__public_key)
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)
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self.__certificate = self.__builder.sign(
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private_key=self.__private_key,
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algorithm=hashes.SHA256(),
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backend=default_backend(),
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)
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@property
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def private_key(self):
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"""Return private key in PEM format"""
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return self.__private_key.private_bytes(
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encoding=serialization.Encoding.PEM,
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format=serialization.PrivateFormat.TraditionalOpenSSL,
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encryption_algorithm=serialization.NoEncryption(),
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).decode("utf-8")
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@property
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def certificate(self):
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"""Return certificate in PEM format"""
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return self.__certificate.public_bytes(
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encoding=serialization.Encoding.PEM,
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).decode("utf-8")
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