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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
from enum import Enum
import six
from cryptography.hazmat.primitives import hashes
from cryptography.x509 import Certificate
_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 OCSPResponseStatus(Enum):
SUCCESSFUL = 0
MALFORMED_REQUEST = 1
INTERNAL_ERROR = 2
TRY_LATER = 3
SIG_REQUIRED = 5
UNAUTHORIZED = 6
_RESPONSE_STATUS_TO_ENUM = dict((x.value, x) for x in OCSPResponseStatus)
class OCSPCertStatus(Enum):
GOOD = 0
REVOKED = 1
UNKNOWN = 2
_CERT_STATUS_TO_ENUM = dict((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):
self._request = request
def add_certificate(self, cert, issuer, algorithm):
if self._request is not None:
raise ValueError("Only one certificate can be added to a request")
allowed_hashes = (
hashes.SHA1, hashes.SHA224, hashes.SHA256,
hashes.SHA384, hashes.SHA512
)
if not isinstance(algorithm, allowed_hashes):
raise ValueError(
"Algorithm must be SHA1, SHA224, SHA256, SHA384, or SHA512"
)
if (
not isinstance(cert, Certificate) or
not isinstance(issuer, Certificate)
):
raise TypeError("cert and issuer must be a Certificate")
return OCSPRequestBuilder((cert, issuer, algorithm))
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)
@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(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.
"""
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