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345 lines
11 KiB
Python
Executable File
345 lines
11 KiB
Python
Executable File
# This file is dual licensed under the terms of the Apache License, Version
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# 2.0, and the BSD License. See the LICENSE file in the root of this repository
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# for complete details.
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from __future__ import annotations
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import datetime
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import typing
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from cryptography import utils, x509
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from cryptography.hazmat.bindings._rust import ocsp
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from cryptography.hazmat.primitives import hashes
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from cryptography.hazmat.primitives.asymmetric.types import (
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CertificateIssuerPrivateKeyTypes,
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)
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from cryptography.x509.base import (
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_EARLIEST_UTC_TIME,
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_convert_to_naive_utc_time,
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_reject_duplicate_extension,
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)
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class OCSPResponderEncoding(utils.Enum):
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HASH = "By Hash"
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NAME = "By Name"
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class OCSPResponseStatus(utils.Enum):
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SUCCESSFUL = 0
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MALFORMED_REQUEST = 1
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INTERNAL_ERROR = 2
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TRY_LATER = 3
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SIG_REQUIRED = 5
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UNAUTHORIZED = 6
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_ALLOWED_HASHES = (
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hashes.SHA1,
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hashes.SHA224,
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hashes.SHA256,
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hashes.SHA384,
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hashes.SHA512,
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)
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def _verify_algorithm(algorithm: hashes.HashAlgorithm) -> None:
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if not isinstance(algorithm, _ALLOWED_HASHES):
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raise ValueError(
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"Algorithm must be SHA1, SHA224, SHA256, SHA384, or SHA512"
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)
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class OCSPCertStatus(utils.Enum):
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GOOD = 0
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REVOKED = 1
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UNKNOWN = 2
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class _SingleResponse:
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def __init__(
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self,
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cert: x509.Certificate,
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issuer: x509.Certificate,
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algorithm: hashes.HashAlgorithm,
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cert_status: OCSPCertStatus,
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this_update: datetime.datetime,
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next_update: datetime.datetime | None,
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revocation_time: datetime.datetime | None,
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revocation_reason: x509.ReasonFlags | None,
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):
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if not isinstance(cert, x509.Certificate) or not isinstance(
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issuer, x509.Certificate
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):
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raise TypeError("cert and issuer must be a Certificate")
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_verify_algorithm(algorithm)
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if not isinstance(this_update, datetime.datetime):
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raise TypeError("this_update must be a datetime object")
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if next_update is not None and not isinstance(
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next_update, datetime.datetime
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):
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raise TypeError("next_update must be a datetime object or None")
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self._cert = cert
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self._issuer = issuer
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self._algorithm = algorithm
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self._this_update = this_update
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self._next_update = next_update
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if not isinstance(cert_status, OCSPCertStatus):
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raise TypeError(
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"cert_status must be an item from the OCSPCertStatus enum"
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)
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if cert_status is not OCSPCertStatus.REVOKED:
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if revocation_time is not None:
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raise ValueError(
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"revocation_time can only be provided if the certificate "
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"is revoked"
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)
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if revocation_reason is not None:
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raise ValueError(
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"revocation_reason can only be provided if the certificate"
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" is revoked"
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)
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else:
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if not isinstance(revocation_time, datetime.datetime):
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raise TypeError("revocation_time must be a datetime object")
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revocation_time = _convert_to_naive_utc_time(revocation_time)
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if revocation_time < _EARLIEST_UTC_TIME:
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raise ValueError(
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"The revocation_time must be on or after"
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" 1950 January 1."
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)
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if revocation_reason is not None and not isinstance(
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revocation_reason, x509.ReasonFlags
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):
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raise TypeError(
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"revocation_reason must be an item from the ReasonFlags "
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"enum or None"
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)
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self._cert_status = cert_status
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self._revocation_time = revocation_time
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self._revocation_reason = revocation_reason
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OCSPRequest = ocsp.OCSPRequest
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OCSPResponse = ocsp.OCSPResponse
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OCSPSingleResponse = ocsp.OCSPSingleResponse
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class OCSPRequestBuilder:
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def __init__(
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self,
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request: tuple[
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x509.Certificate, x509.Certificate, hashes.HashAlgorithm
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]
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| None = None,
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request_hash: tuple[bytes, bytes, int, hashes.HashAlgorithm]
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| None = None,
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extensions: list[x509.Extension[x509.ExtensionType]] = [],
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) -> None:
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self._request = request
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self._request_hash = request_hash
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self._extensions = extensions
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def add_certificate(
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self,
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cert: x509.Certificate,
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issuer: x509.Certificate,
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algorithm: hashes.HashAlgorithm,
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) -> OCSPRequestBuilder:
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if self._request is not None or self._request_hash is not None:
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raise ValueError("Only one certificate can be added to a request")
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_verify_algorithm(algorithm)
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if not isinstance(cert, x509.Certificate) or not isinstance(
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issuer, x509.Certificate
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):
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raise TypeError("cert and issuer must be a Certificate")
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return OCSPRequestBuilder(
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(cert, issuer, algorithm), self._request_hash, self._extensions
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)
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def add_certificate_by_hash(
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self,
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issuer_name_hash: bytes,
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issuer_key_hash: bytes,
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serial_number: int,
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algorithm: hashes.HashAlgorithm,
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) -> OCSPRequestBuilder:
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if self._request is not None or self._request_hash is not None:
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raise ValueError("Only one certificate can be added to a request")
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if not isinstance(serial_number, int):
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raise TypeError("serial_number must be an integer")
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_verify_algorithm(algorithm)
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utils._check_bytes("issuer_name_hash", issuer_name_hash)
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utils._check_bytes("issuer_key_hash", issuer_key_hash)
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if algorithm.digest_size != len(
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issuer_name_hash
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) or algorithm.digest_size != len(issuer_key_hash):
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raise ValueError(
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"issuer_name_hash and issuer_key_hash must be the same length "
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"as the digest size of the algorithm"
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)
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return OCSPRequestBuilder(
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self._request,
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(issuer_name_hash, issuer_key_hash, serial_number, algorithm),
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self._extensions,
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)
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def add_extension(
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self, extval: x509.ExtensionType, critical: bool
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) -> OCSPRequestBuilder:
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if not isinstance(extval, x509.ExtensionType):
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raise TypeError("extension must be an ExtensionType")
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extension = x509.Extension(extval.oid, critical, extval)
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_reject_duplicate_extension(extension, self._extensions)
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return OCSPRequestBuilder(
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self._request, self._request_hash, [*self._extensions, extension]
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)
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def build(self) -> OCSPRequest:
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if self._request is None and self._request_hash is None:
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raise ValueError("You must add a certificate before building")
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return ocsp.create_ocsp_request(self)
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class OCSPResponseBuilder:
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def __init__(
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self,
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response: _SingleResponse | None = None,
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responder_id: tuple[x509.Certificate, OCSPResponderEncoding]
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| None = None,
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certs: list[x509.Certificate] | None = None,
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extensions: list[x509.Extension[x509.ExtensionType]] = [],
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):
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self._response = response
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self._responder_id = responder_id
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self._certs = certs
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self._extensions = extensions
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def add_response(
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self,
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cert: x509.Certificate,
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issuer: x509.Certificate,
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algorithm: hashes.HashAlgorithm,
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cert_status: OCSPCertStatus,
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this_update: datetime.datetime,
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next_update: datetime.datetime | None,
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revocation_time: datetime.datetime | None,
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revocation_reason: x509.ReasonFlags | None,
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) -> OCSPResponseBuilder:
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if self._response is not None:
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raise ValueError("Only one response per OCSPResponse.")
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singleresp = _SingleResponse(
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cert,
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issuer,
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algorithm,
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cert_status,
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this_update,
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next_update,
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revocation_time,
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revocation_reason,
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)
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return OCSPResponseBuilder(
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singleresp,
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self._responder_id,
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self._certs,
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self._extensions,
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)
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def responder_id(
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self, encoding: OCSPResponderEncoding, responder_cert: x509.Certificate
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) -> OCSPResponseBuilder:
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if self._responder_id is not None:
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raise ValueError("responder_id can only be set once")
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if not isinstance(responder_cert, x509.Certificate):
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raise TypeError("responder_cert must be a Certificate")
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if not isinstance(encoding, OCSPResponderEncoding):
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raise TypeError(
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"encoding must be an element from OCSPResponderEncoding"
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)
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return OCSPResponseBuilder(
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self._response,
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(responder_cert, encoding),
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self._certs,
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self._extensions,
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)
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def certificates(
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self, certs: typing.Iterable[x509.Certificate]
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) -> OCSPResponseBuilder:
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if self._certs is not None:
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raise ValueError("certificates may only be set once")
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certs = list(certs)
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if len(certs) == 0:
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raise ValueError("certs must not be an empty list")
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if not all(isinstance(x, x509.Certificate) for x in certs):
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raise TypeError("certs must be a list of Certificates")
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return OCSPResponseBuilder(
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self._response,
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self._responder_id,
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certs,
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self._extensions,
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)
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def add_extension(
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self, extval: x509.ExtensionType, critical: bool
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) -> OCSPResponseBuilder:
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if not isinstance(extval, x509.ExtensionType):
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raise TypeError("extension must be an ExtensionType")
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extension = x509.Extension(extval.oid, critical, extval)
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_reject_duplicate_extension(extension, self._extensions)
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return OCSPResponseBuilder(
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self._response,
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self._responder_id,
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self._certs,
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[*self._extensions, extension],
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)
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def sign(
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self,
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private_key: CertificateIssuerPrivateKeyTypes,
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algorithm: hashes.HashAlgorithm | None,
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) -> OCSPResponse:
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if self._response is None:
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raise ValueError("You must add a response before signing")
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if self._responder_id is None:
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raise ValueError("You must add a responder_id before signing")
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return ocsp.create_ocsp_response(
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OCSPResponseStatus.SUCCESSFUL, self, private_key, algorithm
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)
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@classmethod
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def build_unsuccessful(
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cls, response_status: OCSPResponseStatus
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) -> OCSPResponse:
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if not isinstance(response_status, OCSPResponseStatus):
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raise TypeError(
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"response_status must be an item from OCSPResponseStatus"
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)
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if response_status is OCSPResponseStatus.SUCCESSFUL:
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raise ValueError("response_status cannot be SUCCESSFUL")
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return ocsp.create_ocsp_response(response_status, None, None, None)
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load_der_ocsp_request = ocsp.load_der_ocsp_request
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load_der_ocsp_response = ocsp.load_der_ocsp_response
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