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# This file is dual licensed under the terms of the Apache License, Version # 2.0, and the BSD License. See the LICENSE file in the root of this repository # for complete details. from __future__ import absolute_import, division, print_function import abc import datetime from enum import Enum import six from cryptography import x509 from cryptography.hazmat.primitives import hashes from cryptography.x509.base import ( _EARLIEST_UTC_TIME, _convert_to_naive_utc_time, _reject_duplicate_extension, ) _OIDS_TO_HASH = { "1.3.14.3.2.26": hashes.SHA1(), "2.16.840.1.101.3.4.2.4": hashes.SHA224(), "2.16.840.1.101.3.4.2.1": hashes.SHA256(), "2.16.840.1.101.3.4.2.2": hashes.SHA384(), "2.16.840.1.101.3.4.2.3": hashes.SHA512(), } class OCSPResponderEncoding(Enum): HASH = "By Hash" NAME = "By Name" class OCSPResponseStatus(Enum): SUCCESSFUL = 0 MALFORMED_REQUEST = 1 INTERNAL_ERROR = 2 TRY_LATER = 3 SIG_REQUIRED = 5 UNAUTHORIZED = 6 _RESPONSE_STATUS_TO_ENUM = {x.value: x for x in OCSPResponseStatus} _ALLOWED_HASHES = ( hashes.SHA1, hashes.SHA224, hashes.SHA256, hashes.SHA384, hashes.SHA512, ) def _verify_algorithm(algorithm): if not isinstance(algorithm, _ALLOWED_HASHES): raise ValueError( "Algorithm must be SHA1, SHA224, SHA256, SHA384, or SHA512" ) class OCSPCertStatus(Enum): GOOD = 0 REVOKED = 1 UNKNOWN = 2 _CERT_STATUS_TO_ENUM = {x.value: x for x in OCSPCertStatus} def load_der_ocsp_request(data): from cryptography.hazmat.backends.openssl.backend import backend return backend.load_der_ocsp_request(data) def load_der_ocsp_response(data): from cryptography.hazmat.backends.openssl.backend import backend return backend.load_der_ocsp_response(data) class OCSPRequestBuilder(object): def __init__(self, request=None, extensions=[]): self._request = request self._extensions = extensions def add_certificate(self, cert, issuer, algorithm): if self._request is not None: raise ValueError("Only one certificate can be added to a request") _verify_algorithm(algorithm) if not isinstance(cert, x509.Certificate) or not isinstance( issuer, x509.Certificate ): raise TypeError("cert and issuer must be a Certificate") return OCSPRequestBuilder((cert, issuer, algorithm), self._extensions) def add_extension(self, extension, critical): if not isinstance(extension, x509.ExtensionType): raise TypeError("extension must be an ExtensionType") extension = x509.Extension(extension.oid, critical, extension) _reject_duplicate_extension(extension, self._extensions) return OCSPRequestBuilder( self._request, self._extensions + [extension] ) def build(self): from cryptography.hazmat.backends.openssl.backend import backend if self._request is None: raise ValueError("You must add a certificate before building") return backend.create_ocsp_request(self) class _SingleResponse(object): def __init__( self, cert, issuer, algorithm, cert_status, this_update, next_update, revocation_time, revocation_reason, ): if not isinstance(cert, x509.Certificate) or not isinstance( issuer, x509.Certificate ): raise TypeError("cert and issuer must be a Certificate") _verify_algorithm(algorithm) if not isinstance(this_update, datetime.datetime): raise TypeError("this_update must be a datetime object") if next_update is not None and not isinstance( next_update, datetime.datetime ): raise TypeError("next_update must be a datetime object or None") self._cert = cert self._issuer = issuer self._algorithm = algorithm self._this_update = this_update self._next_update = next_update if not isinstance(cert_status, OCSPCertStatus): raise TypeError( "cert_status must be an item from the OCSPCertStatus enum" ) if cert_status is not OCSPCertStatus.REVOKED: if revocation_time is not None: raise ValueError( "revocation_time can only be provided if the certificate " "is revoked" ) if revocation_reason is not None: raise ValueError( "revocation_reason can only be provided if the certificate" " is revoked" ) else: if not isinstance(revocation_time, datetime.datetime): raise TypeError("revocation_time must be a datetime object") revocation_time = _convert_to_naive_utc_time(revocation_time) if revocation_time < _EARLIEST_UTC_TIME: raise ValueError( "The revocation_time must be on or after" " 1950 January 1." ) if revocation_reason is not None and not isinstance( revocation_reason, x509.ReasonFlags ): raise TypeError( "revocation_reason must be an item from the ReasonFlags " "enum or None" ) self._cert_status = cert_status self._revocation_time = revocation_time self._revocation_reason = revocation_reason class OCSPResponseBuilder(object): def __init__( self, response=None, responder_id=None, certs=None, extensions=[] ): self._response = response self._responder_id = responder_id self._certs = certs self._extensions = extensions def add_response( self, cert, issuer, algorithm, cert_status, this_update, next_update, revocation_time, revocation_reason, ): if self._response is not None: raise ValueError("Only one response per OCSPResponse.") singleresp = _SingleResponse( cert, issuer, algorithm, cert_status, this_update, next_update, revocation_time, revocation_reason, ) return OCSPResponseBuilder( singleresp, self._responder_id, self._certs, self._extensions, ) def responder_id(self, encoding, responder_cert): if self._responder_id is not None: raise ValueError("responder_id can only be set once") if not isinstance(responder_cert, x509.Certificate): raise TypeError("responder_cert must be a Certificate") if not isinstance(encoding, OCSPResponderEncoding): raise TypeError( "encoding must be an element from OCSPResponderEncoding" ) return OCSPResponseBuilder( self._response, (responder_cert, encoding), self._certs, self._extensions, ) def certificates(self, certs): if self._certs is not None: raise ValueError("certificates may only be set once") certs = list(certs) if len(certs) == 0: raise ValueError("certs must not be an empty list") if not all(isinstance(x, x509.Certificate) for x in certs): raise TypeError("certs must be a list of Certificates") return OCSPResponseBuilder( self._response, self._responder_id, certs, self._extensions, ) def add_extension(self, extension, critical): if not isinstance(extension, x509.ExtensionType): raise TypeError("extension must be an ExtensionType") extension = x509.Extension(extension.oid, critical, extension) _reject_duplicate_extension(extension, self._extensions) return OCSPResponseBuilder( self._response, self._responder_id, self._certs, self._extensions + [extension], ) def sign(self, private_key, algorithm): from cryptography.hazmat.backends.openssl.backend import backend if self._response is None: raise ValueError("You must add a response before signing") if self._responder_id is None: raise ValueError("You must add a responder_id before signing") return backend.create_ocsp_response( OCSPResponseStatus.SUCCESSFUL, self, private_key, algorithm ) @classmethod def build_unsuccessful(cls, response_status): from cryptography.hazmat.backends.openssl.backend import backend if not isinstance(response_status, OCSPResponseStatus): raise TypeError( "response_status must be an item from OCSPResponseStatus" ) if response_status is OCSPResponseStatus.SUCCESSFUL: raise ValueError("response_status cannot be SUCCESSFUL") return backend.create_ocsp_response(response_status, None, None, None) @six.add_metaclass(abc.ABCMeta) class OCSPRequest(object): @abc.abstractproperty def issuer_key_hash(self): """ The hash of the issuer public key """ @abc.abstractproperty def issuer_name_hash(self): """ The hash of the issuer name """ @abc.abstractproperty def hash_algorithm(self): """ The hash algorithm used in the issuer name and key hashes """ @abc.abstractproperty def serial_number(self): """ The serial number of the cert whose status is being checked """ @abc.abstractmethod def public_bytes(self, encoding): """ Serializes the request to DER """ @abc.abstractproperty def extensions(self): """ The list of request extensions. Not single request extensions. """ @six.add_metaclass(abc.ABCMeta) class OCSPResponse(object): @abc.abstractproperty def response_status(self): """ The status of the response. This is a value from the OCSPResponseStatus enumeration """ @abc.abstractproperty def signature_algorithm_oid(self): """ The ObjectIdentifier of the signature algorithm """ @abc.abstractproperty def signature_hash_algorithm(self): """ Returns a HashAlgorithm corresponding to the type of the digest signed """ @abc.abstractproperty def signature(self): """ The signature bytes """ @abc.abstractproperty def tbs_response_bytes(self): """ The tbsResponseData bytes """ @abc.abstractproperty def certificates(self): """ A list of certificates used to help build a chain to verify the OCSP response. This situation occurs when the OCSP responder uses a delegate certificate. """ @abc.abstractproperty def responder_key_hash(self): """ The responder's key hash or None """ @abc.abstractproperty def responder_name(self): """ The responder's Name or None """ @abc.abstractproperty def produced_at(self): """ The time the response was produced """ @abc.abstractproperty def certificate_status(self): """ The status of the certificate (an element from the OCSPCertStatus enum) """ @abc.abstractproperty def revocation_time(self): """ The date of when the certificate was revoked or None if not revoked. """ @abc.abstractproperty def revocation_reason(self): """ The reason the certificate was revoked or None if not specified or not revoked. """ @abc.abstractproperty def this_update(self): """ The most recent time at which the status being indicated is known by the responder to have been correct """ @abc.abstractproperty def next_update(self): """ The time when newer information will be available """ @abc.abstractproperty def issuer_key_hash(self): """ The hash of the issuer public key """ @abc.abstractproperty def issuer_name_hash(self): """ The hash of the issuer name """ @abc.abstractproperty def hash_algorithm(self): """ The hash algorithm used in the issuer name and key hashes """ @abc.abstractproperty def serial_number(self): """ The serial number of the cert whose status is being checked """ @abc.abstractproperty def extensions(self): """ The list of response extensions. Not single response extensions. """ @abc.abstractproperty def single_extensions(self): """ The list of single response extensions. Not response extensions. """