753 lines
23 KiB
Python
753 lines
23 KiB
Python
# 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 absolute_import, division, print_function
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import abc
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import datetime
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import os
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from enum import Enum
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import six
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from cryptography import utils
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from cryptography.hazmat.primitives.asymmetric import dsa, ec, rsa
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from cryptography.x509.extensions import Extension, ExtensionType
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from cryptography.x509.name import Name
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_UNIX_EPOCH = datetime.datetime(1970, 1, 1)
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def _reject_duplicate_extension(extension, extensions):
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# This is quadratic in the number of extensions
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for e in extensions:
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if e.oid == extension.oid:
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raise ValueError('This extension has already been set.')
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def _convert_to_naive_utc_time(time):
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"""Normalizes a datetime to a naive datetime in UTC.
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time -- datetime to normalize. Assumed to be in UTC if not timezone
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aware.
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"""
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if time.tzinfo is not None:
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offset = time.utcoffset()
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offset = offset if offset else datetime.timedelta()
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return time.replace(tzinfo=None) - offset
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else:
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return time
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class Version(Enum):
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v1 = 0
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v3 = 2
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def load_pem_x509_certificate(data, backend):
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return backend.load_pem_x509_certificate(data)
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def load_der_x509_certificate(data, backend):
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return backend.load_der_x509_certificate(data)
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def load_pem_x509_csr(data, backend):
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return backend.load_pem_x509_csr(data)
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def load_der_x509_csr(data, backend):
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return backend.load_der_x509_csr(data)
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def load_pem_x509_crl(data, backend):
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return backend.load_pem_x509_crl(data)
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def load_der_x509_crl(data, backend):
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return backend.load_der_x509_crl(data)
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class InvalidVersion(Exception):
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def __init__(self, msg, parsed_version):
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super(InvalidVersion, self).__init__(msg)
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self.parsed_version = parsed_version
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@six.add_metaclass(abc.ABCMeta)
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class Certificate(object):
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@abc.abstractmethod
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def fingerprint(self, algorithm):
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"""
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Returns bytes using digest passed.
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"""
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@abc.abstractproperty
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def serial_number(self):
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"""
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Returns certificate serial number
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"""
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@abc.abstractproperty
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def version(self):
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"""
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Returns the certificate version
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"""
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@abc.abstractmethod
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def public_key(self):
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"""
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Returns the public key
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"""
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@abc.abstractproperty
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def not_valid_before(self):
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"""
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Not before time (represented as UTC datetime)
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"""
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@abc.abstractproperty
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def not_valid_after(self):
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"""
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Not after time (represented as UTC datetime)
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"""
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@abc.abstractproperty
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def issuer(self):
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"""
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Returns the issuer name object.
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"""
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@abc.abstractproperty
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def subject(self):
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"""
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Returns the subject name object.
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"""
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@abc.abstractproperty
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def signature_hash_algorithm(self):
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"""
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Returns a HashAlgorithm corresponding to the type of the digest signed
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in the certificate.
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"""
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@abc.abstractproperty
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def signature_algorithm_oid(self):
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"""
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Returns the ObjectIdentifier of the signature algorithm.
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"""
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@abc.abstractproperty
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def extensions(self):
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"""
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Returns an Extensions object.
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"""
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@abc.abstractproperty
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def signature(self):
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"""
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Returns the signature bytes.
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"""
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@abc.abstractproperty
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def tbs_certificate_bytes(self):
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"""
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Returns the tbsCertificate payload bytes as defined in RFC 5280.
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"""
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@abc.abstractmethod
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def __eq__(self, other):
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"""
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Checks equality.
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"""
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@abc.abstractmethod
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def __ne__(self, other):
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"""
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Checks not equal.
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"""
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@abc.abstractmethod
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def __hash__(self):
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"""
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Computes a hash.
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"""
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@abc.abstractmethod
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def public_bytes(self, encoding):
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"""
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Serializes the certificate to PEM or DER format.
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"""
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@six.add_metaclass(abc.ABCMeta)
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class CertificateRevocationList(object):
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@abc.abstractmethod
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def public_bytes(self, encoding):
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"""
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Serializes the CRL to PEM or DER format.
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"""
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@abc.abstractmethod
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def fingerprint(self, algorithm):
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"""
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Returns bytes using digest passed.
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"""
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@abc.abstractmethod
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def get_revoked_certificate_by_serial_number(self, serial_number):
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"""
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Returns an instance of RevokedCertificate or None if the serial_number
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is not in the CRL.
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"""
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@abc.abstractproperty
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def signature_hash_algorithm(self):
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"""
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Returns a HashAlgorithm corresponding to the type of the digest signed
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in the certificate.
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"""
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@abc.abstractproperty
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def signature_algorithm_oid(self):
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"""
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Returns the ObjectIdentifier of the signature algorithm.
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"""
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@abc.abstractproperty
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def issuer(self):
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"""
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Returns the X509Name with the issuer of this CRL.
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"""
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@abc.abstractproperty
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def next_update(self):
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"""
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Returns the date of next update for this CRL.
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"""
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@abc.abstractproperty
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def last_update(self):
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"""
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Returns the date of last update for this CRL.
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"""
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@abc.abstractproperty
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def extensions(self):
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"""
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Returns an Extensions object containing a list of CRL extensions.
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"""
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@abc.abstractproperty
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def signature(self):
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"""
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Returns the signature bytes.
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"""
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@abc.abstractproperty
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def tbs_certlist_bytes(self):
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"""
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Returns the tbsCertList payload bytes as defined in RFC 5280.
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"""
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@abc.abstractmethod
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def __eq__(self, other):
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"""
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Checks equality.
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"""
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@abc.abstractmethod
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def __ne__(self, other):
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"""
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Checks not equal.
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"""
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@abc.abstractmethod
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def __len__(self):
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"""
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Number of revoked certificates in the CRL.
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"""
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@abc.abstractmethod
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def __getitem__(self, idx):
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"""
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Returns a revoked certificate (or slice of revoked certificates).
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"""
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@abc.abstractmethod
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def __iter__(self):
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"""
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Iterator over the revoked certificates
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"""
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@abc.abstractmethod
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def is_signature_valid(self, public_key):
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"""
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Verifies signature of revocation list against given public key.
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"""
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@six.add_metaclass(abc.ABCMeta)
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class CertificateSigningRequest(object):
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@abc.abstractmethod
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def __eq__(self, other):
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"""
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Checks equality.
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"""
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@abc.abstractmethod
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def __ne__(self, other):
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"""
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Checks not equal.
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"""
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@abc.abstractmethod
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def __hash__(self):
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"""
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Computes a hash.
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"""
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@abc.abstractmethod
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def public_key(self):
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"""
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Returns the public key
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"""
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@abc.abstractproperty
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def subject(self):
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"""
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Returns the subject name object.
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"""
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@abc.abstractproperty
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def signature_hash_algorithm(self):
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"""
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Returns a HashAlgorithm corresponding to the type of the digest signed
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in the certificate.
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"""
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@abc.abstractproperty
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def signature_algorithm_oid(self):
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"""
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Returns the ObjectIdentifier of the signature algorithm.
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"""
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@abc.abstractproperty
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def extensions(self):
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"""
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Returns the extensions in the signing request.
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"""
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@abc.abstractmethod
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def public_bytes(self, encoding):
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"""
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Encodes the request to PEM or DER format.
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"""
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@abc.abstractproperty
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def signature(self):
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"""
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Returns the signature bytes.
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"""
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@abc.abstractproperty
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def tbs_certrequest_bytes(self):
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"""
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Returns the PKCS#10 CertificationRequestInfo bytes as defined in RFC
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2986.
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"""
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@abc.abstractproperty
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def is_signature_valid(self):
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"""
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Verifies signature of signing request.
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"""
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@six.add_metaclass(abc.ABCMeta)
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class RevokedCertificate(object):
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@abc.abstractproperty
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def serial_number(self):
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"""
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Returns the serial number of the revoked certificate.
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"""
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@abc.abstractproperty
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def revocation_date(self):
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"""
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Returns the date of when this certificate was revoked.
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"""
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@abc.abstractproperty
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def extensions(self):
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"""
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Returns an Extensions object containing a list of Revoked extensions.
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"""
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class CertificateSigningRequestBuilder(object):
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def __init__(self, subject_name=None, extensions=[]):
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"""
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Creates an empty X.509 certificate request (v1).
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"""
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self._subject_name = subject_name
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self._extensions = extensions
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def subject_name(self, name):
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"""
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Sets the certificate requestor's distinguished name.
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"""
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if not isinstance(name, Name):
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raise TypeError('Expecting x509.Name object.')
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if self._subject_name is not None:
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raise ValueError('The subject name may only be set once.')
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return CertificateSigningRequestBuilder(name, self._extensions)
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def add_extension(self, extension, critical):
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"""
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Adds an X.509 extension to the certificate request.
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"""
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if not isinstance(extension, ExtensionType):
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raise TypeError("extension must be an ExtensionType")
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extension = Extension(extension.oid, critical, extension)
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_reject_duplicate_extension(extension, self._extensions)
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return CertificateSigningRequestBuilder(
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self._subject_name, self._extensions + [extension]
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)
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def sign(self, private_key, algorithm, backend):
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"""
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Signs the request using the requestor's private key.
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"""
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if self._subject_name is None:
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raise ValueError("A CertificateSigningRequest must have a subject")
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return backend.create_x509_csr(self, private_key, algorithm)
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class CertificateBuilder(object):
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def __init__(self, issuer_name=None, subject_name=None,
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public_key=None, serial_number=None, not_valid_before=None,
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not_valid_after=None, extensions=[]):
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self._version = Version.v3
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self._issuer_name = issuer_name
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self._subject_name = subject_name
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self._public_key = public_key
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self._serial_number = serial_number
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self._not_valid_before = not_valid_before
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self._not_valid_after = not_valid_after
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self._extensions = extensions
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def issuer_name(self, name):
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"""
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Sets the CA's distinguished name.
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"""
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if not isinstance(name, Name):
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raise TypeError('Expecting x509.Name object.')
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if self._issuer_name is not None:
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raise ValueError('The issuer name may only be set once.')
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return CertificateBuilder(
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name, self._subject_name, self._public_key,
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self._serial_number, self._not_valid_before,
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self._not_valid_after, self._extensions
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)
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def subject_name(self, name):
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"""
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Sets the requestor's distinguished name.
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"""
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if not isinstance(name, Name):
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raise TypeError('Expecting x509.Name object.')
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if self._subject_name is not None:
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raise ValueError('The subject name may only be set once.')
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return CertificateBuilder(
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self._issuer_name, name, self._public_key,
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self._serial_number, self._not_valid_before,
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self._not_valid_after, self._extensions
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)
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def public_key(self, key):
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"""
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Sets the requestor's public key (as found in the signing request).
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"""
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if not isinstance(key, (dsa.DSAPublicKey, rsa.RSAPublicKey,
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ec.EllipticCurvePublicKey)):
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raise TypeError('Expecting one of DSAPublicKey, RSAPublicKey,'
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' or EllipticCurvePublicKey.')
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if self._public_key is not None:
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raise ValueError('The public key may only be set once.')
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return CertificateBuilder(
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self._issuer_name, self._subject_name, key,
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self._serial_number, self._not_valid_before,
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self._not_valid_after, self._extensions
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)
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def serial_number(self, number):
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"""
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Sets the certificate serial number.
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"""
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if not isinstance(number, six.integer_types):
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raise TypeError('Serial number must be of integral type.')
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if self._serial_number is not None:
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raise ValueError('The serial number may only be set once.')
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if number <= 0:
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raise ValueError('The serial number should be positive.')
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# ASN.1 integers are always signed, so most significant bit must be
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# zero.
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if number.bit_length() >= 160: # As defined in RFC 5280
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raise ValueError('The serial number should not be more than 159 '
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'bits.')
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return CertificateBuilder(
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self._issuer_name, self._subject_name,
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self._public_key, number, self._not_valid_before,
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self._not_valid_after, self._extensions
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)
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def not_valid_before(self, time):
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"""
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Sets the certificate activation time.
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"""
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if not isinstance(time, datetime.datetime):
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raise TypeError('Expecting datetime object.')
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if self._not_valid_before is not None:
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raise ValueError('The not valid before may only be set once.')
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time = _convert_to_naive_utc_time(time)
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if time <= _UNIX_EPOCH:
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raise ValueError('The not valid before date must be after the unix'
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' epoch (1970 January 1).')
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if self._not_valid_after is not None and time > self._not_valid_after:
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raise ValueError(
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'The not valid before date must be before the not valid after '
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'date.'
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)
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return CertificateBuilder(
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self._issuer_name, self._subject_name,
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self._public_key, self._serial_number, time,
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self._not_valid_after, self._extensions
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)
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def not_valid_after(self, time):
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"""
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Sets the certificate expiration time.
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"""
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if not isinstance(time, datetime.datetime):
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raise TypeError('Expecting datetime object.')
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if self._not_valid_after is not None:
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raise ValueError('The not valid after may only be set once.')
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time = _convert_to_naive_utc_time(time)
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if time <= _UNIX_EPOCH:
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raise ValueError('The not valid after date must be after the unix'
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' epoch (1970 January 1).')
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if (self._not_valid_before is not None and
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time < self._not_valid_before):
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raise ValueError(
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'The not valid after date must be after the not valid before '
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'date.'
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)
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return CertificateBuilder(
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self._issuer_name, self._subject_name,
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self._public_key, self._serial_number, self._not_valid_before,
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time, self._extensions
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)
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def add_extension(self, extension, critical):
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"""
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Adds an X.509 extension to the certificate.
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"""
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if not isinstance(extension, ExtensionType):
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raise TypeError("extension must be an ExtensionType")
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extension = Extension(extension.oid, critical, extension)
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_reject_duplicate_extension(extension, self._extensions)
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return CertificateBuilder(
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self._issuer_name, self._subject_name,
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self._public_key, self._serial_number, self._not_valid_before,
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self._not_valid_after, self._extensions + [extension]
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)
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def sign(self, private_key, algorithm, backend):
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"""
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Signs the certificate using the CA's private key.
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"""
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if self._subject_name is None:
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raise ValueError("A certificate must have a subject name")
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if self._issuer_name is None:
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raise ValueError("A certificate must have an issuer name")
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if self._serial_number is None:
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raise ValueError("A certificate must have a serial number")
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if self._not_valid_before is None:
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raise ValueError("A certificate must have a not valid before time")
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if self._not_valid_after is None:
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raise ValueError("A certificate must have a not valid after time")
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if self._public_key is None:
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raise ValueError("A certificate must have a public key")
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return backend.create_x509_certificate(self, private_key, algorithm)
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class CertificateRevocationListBuilder(object):
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def __init__(self, issuer_name=None, last_update=None, next_update=None,
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extensions=[], revoked_certificates=[]):
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self._issuer_name = issuer_name
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self._last_update = last_update
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self._next_update = next_update
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self._extensions = extensions
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self._revoked_certificates = revoked_certificates
|
|
|
|
def issuer_name(self, issuer_name):
|
|
if not isinstance(issuer_name, Name):
|
|
raise TypeError('Expecting x509.Name object.')
|
|
if self._issuer_name is not None:
|
|
raise ValueError('The issuer name may only be set once.')
|
|
return CertificateRevocationListBuilder(
|
|
issuer_name, self._last_update, self._next_update,
|
|
self._extensions, self._revoked_certificates
|
|
)
|
|
|
|
def last_update(self, last_update):
|
|
if not isinstance(last_update, datetime.datetime):
|
|
raise TypeError('Expecting datetime object.')
|
|
if self._last_update is not None:
|
|
raise ValueError('Last update may only be set once.')
|
|
last_update = _convert_to_naive_utc_time(last_update)
|
|
if last_update <= _UNIX_EPOCH:
|
|
raise ValueError('The last update date must be after the unix'
|
|
' epoch (1970 January 1).')
|
|
if self._next_update is not None and last_update > self._next_update:
|
|
raise ValueError(
|
|
'The last update date must be before the next update date.'
|
|
)
|
|
return CertificateRevocationListBuilder(
|
|
self._issuer_name, last_update, self._next_update,
|
|
self._extensions, self._revoked_certificates
|
|
)
|
|
|
|
def next_update(self, next_update):
|
|
if not isinstance(next_update, datetime.datetime):
|
|
raise TypeError('Expecting datetime object.')
|
|
if self._next_update is not None:
|
|
raise ValueError('Last update may only be set once.')
|
|
next_update = _convert_to_naive_utc_time(next_update)
|
|
if next_update <= _UNIX_EPOCH:
|
|
raise ValueError('The last update date must be after the unix'
|
|
' epoch (1970 January 1).')
|
|
if self._last_update is not None and next_update < self._last_update:
|
|
raise ValueError(
|
|
'The next update date must be after the last update date.'
|
|
)
|
|
return CertificateRevocationListBuilder(
|
|
self._issuer_name, self._last_update, next_update,
|
|
self._extensions, self._revoked_certificates
|
|
)
|
|
|
|
def add_extension(self, extension, critical):
|
|
"""
|
|
Adds an X.509 extension to the certificate revocation list.
|
|
"""
|
|
if not isinstance(extension, ExtensionType):
|
|
raise TypeError("extension must be an ExtensionType")
|
|
|
|
extension = Extension(extension.oid, critical, extension)
|
|
_reject_duplicate_extension(extension, self._extensions)
|
|
return CertificateRevocationListBuilder(
|
|
self._issuer_name, self._last_update, self._next_update,
|
|
self._extensions + [extension], self._revoked_certificates
|
|
)
|
|
|
|
def add_revoked_certificate(self, revoked_certificate):
|
|
"""
|
|
Adds a revoked certificate to the CRL.
|
|
"""
|
|
if not isinstance(revoked_certificate, RevokedCertificate):
|
|
raise TypeError("Must be an instance of RevokedCertificate")
|
|
|
|
return CertificateRevocationListBuilder(
|
|
self._issuer_name, self._last_update,
|
|
self._next_update, self._extensions,
|
|
self._revoked_certificates + [revoked_certificate]
|
|
)
|
|
|
|
def sign(self, private_key, algorithm, backend):
|
|
if self._issuer_name is None:
|
|
raise ValueError("A CRL must have an issuer name")
|
|
|
|
if self._last_update is None:
|
|
raise ValueError("A CRL must have a last update time")
|
|
|
|
if self._next_update is None:
|
|
raise ValueError("A CRL must have a next update time")
|
|
|
|
return backend.create_x509_crl(self, private_key, algorithm)
|
|
|
|
|
|
class RevokedCertificateBuilder(object):
|
|
def __init__(self, serial_number=None, revocation_date=None,
|
|
extensions=[]):
|
|
self._serial_number = serial_number
|
|
self._revocation_date = revocation_date
|
|
self._extensions = extensions
|
|
|
|
def serial_number(self, number):
|
|
if not isinstance(number, six.integer_types):
|
|
raise TypeError('Serial number must be of integral type.')
|
|
if self._serial_number is not None:
|
|
raise ValueError('The serial number may only be set once.')
|
|
if number <= 0:
|
|
raise ValueError('The serial number should be positive')
|
|
|
|
# ASN.1 integers are always signed, so most significant bit must be
|
|
# zero.
|
|
if number.bit_length() >= 160: # As defined in RFC 5280
|
|
raise ValueError('The serial number should not be more than 159 '
|
|
'bits.')
|
|
return RevokedCertificateBuilder(
|
|
number, self._revocation_date, self._extensions
|
|
)
|
|
|
|
def revocation_date(self, time):
|
|
if not isinstance(time, datetime.datetime):
|
|
raise TypeError('Expecting datetime object.')
|
|
if self._revocation_date is not None:
|
|
raise ValueError('The revocation date may only be set once.')
|
|
time = _convert_to_naive_utc_time(time)
|
|
if time <= _UNIX_EPOCH:
|
|
raise ValueError('The revocation date must be after the unix'
|
|
' epoch (1970 January 1).')
|
|
return RevokedCertificateBuilder(
|
|
self._serial_number, time, self._extensions
|
|
)
|
|
|
|
def add_extension(self, extension, critical):
|
|
if not isinstance(extension, ExtensionType):
|
|
raise TypeError("extension must be an ExtensionType")
|
|
|
|
extension = Extension(extension.oid, critical, extension)
|
|
_reject_duplicate_extension(extension, self._extensions)
|
|
return RevokedCertificateBuilder(
|
|
self._serial_number, self._revocation_date,
|
|
self._extensions + [extension]
|
|
)
|
|
|
|
def build(self, backend):
|
|
if self._serial_number is None:
|
|
raise ValueError("A revoked certificate must have a serial number")
|
|
if self._revocation_date is None:
|
|
raise ValueError(
|
|
"A revoked certificate must have a revocation date"
|
|
)
|
|
|
|
return backend.create_x509_revoked_certificate(self)
|
|
|
|
|
|
def random_serial_number():
|
|
return utils.int_from_bytes(os.urandom(20), "big") >> 1
|