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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 datetime
import operator
from cryptography import utils, x509
from cryptography.exceptions import UnsupportedAlgorithm
from cryptography.hazmat.backends.openssl.decode_asn1 import (
_asn1_integer_to_int,
_asn1_string_to_bytes,
_decode_x509_name,
_obj2txt,
_parse_asn1_time,
)
from cryptography.hazmat.backends.openssl.encode_asn1 import (
_encode_asn1_int_gc,
_txt2obj_gc,
)
from cryptography.hazmat.primitives import hashes, serialization
from cryptography.hazmat.primitives.asymmetric import dsa, ec, rsa
from cryptography.x509.name import _ASN1Type
@utils.register_interface(x509.Certificate)
class _Certificate(object):
def __init__(self, backend, x509_cert):
self._backend = backend
self._x509 = x509_cert
version = self._backend._lib.X509_get_version(self._x509)
if version == 0:
self._version = x509.Version.v1
elif version == 2:
self._version = x509.Version.v3
else:
raise x509.InvalidVersion(
"{} is not a valid X509 version".format(version), version
)
def __repr__(self):
return "<Certificate(subject={}, ...)>".format(self.subject)
def __eq__(self, other):
if not isinstance(other, x509.Certificate):
return NotImplemented
res = self._backend._lib.X509_cmp(self._x509, other._x509)
return res == 0
def __ne__(self, other):
return not self == other
def __hash__(self):
return hash(self.public_bytes(serialization.Encoding.DER))
def __deepcopy__(self, memo):
return self
def fingerprint(self, algorithm):
h = hashes.Hash(algorithm, self._backend)
h.update(self.public_bytes(serialization.Encoding.DER))
return h.finalize()
version = utils.read_only_property("_version")
@property
def serial_number(self):
asn1_int = self._backend._lib.X509_get_serialNumber(self._x509)
self._backend.openssl_assert(asn1_int != self._backend._ffi.NULL)
return _asn1_integer_to_int(self._backend, asn1_int)
@property
def serial(self):
return self.serial_number
def public_key(self):
pkey = self._backend._lib.X509_get_pubkey(self._x509)
if pkey == self._backend._ffi.NULL:
# Remove errors from the stack.
self._backend._consume_errors()
raise ValueError("Certificate public key is of an unknown type")
pkey = self._backend._ffi.gc(pkey, self._backend._lib.EVP_PKEY_free)
return self._backend._evp_pkey_to_public_key(pkey)
@property
def not_valid_before(self):
asn1_time = self._backend._lib.X509_getm_notBefore(self._x509)
return _parse_asn1_time(self._backend, asn1_time)
@property
def not_valid_after(self):
asn1_time = self._backend._lib.X509_getm_notAfter(self._x509)
return _parse_asn1_time(self._backend, asn1_time)
@property
def issuer(self):
issuer = self._backend._lib.X509_get_issuer_name(self._x509)
self._backend.openssl_assert(issuer != self._backend._ffi.NULL)
return _decode_x509_name(self._backend, issuer)
@property
def subject(self):
subject = self._backend._lib.X509_get_subject_name(self._x509)
self._backend.openssl_assert(subject != self._backend._ffi.NULL)
return _decode_x509_name(self._backend, subject)
@property
def signature_hash_algorithm(self):
oid = self.signature_algorithm_oid
try:
return x509._SIG_OIDS_TO_HASH[oid]
except KeyError:
raise UnsupportedAlgorithm(
"Signature algorithm OID:{} not recognized".format(oid)
)
@property
def signature_algorithm_oid(self):
alg = self._backend._ffi.new("X509_ALGOR **")
self._backend._lib.X509_get0_signature(
self._backend._ffi.NULL, alg, self._x509
)
self._backend.openssl_assert(alg[0] != self._backend._ffi.NULL)
oid = _obj2txt(self._backend, alg[0].algorithm)
return x509.ObjectIdentifier(oid)
@utils.cached_property
def extensions(self):
return self._backend._certificate_extension_parser.parse(self._x509)
@property
def signature(self):
sig = self._backend._ffi.new("ASN1_BIT_STRING **")
self._backend._lib.X509_get0_signature(
sig, self._backend._ffi.NULL, self._x509
)
self._backend.openssl_assert(sig[0] != self._backend._ffi.NULL)
return _asn1_string_to_bytes(self._backend, sig[0])
@property
def tbs_certificate_bytes(self):
pp = self._backend._ffi.new("unsigned char **")
res = self._backend._lib.i2d_re_X509_tbs(self._x509, pp)
self._backend.openssl_assert(res > 0)
pp = self._backend._ffi.gc(
pp, lambda pointer: self._backend._lib.OPENSSL_free(pointer[0])
)
return self._backend._ffi.buffer(pp[0], res)[:]
def public_bytes(self, encoding):
bio = self._backend._create_mem_bio_gc()
if encoding is serialization.Encoding.PEM:
res = self._backend._lib.PEM_write_bio_X509(bio, self._x509)
elif encoding is serialization.Encoding.DER:
res = self._backend._lib.i2d_X509_bio(bio, self._x509)
else:
raise TypeError("encoding must be an item from the Encoding enum")
self._backend.openssl_assert(res == 1)
return self._backend._read_mem_bio(bio)
@utils.register_interface(x509.RevokedCertificate)
class _RevokedCertificate(object):
def __init__(self, backend, crl, x509_revoked):
self._backend = backend
# The X509_REVOKED_value is a X509_REVOKED * that has
# no reference counting. This means when X509_CRL_free is
# called then the CRL and all X509_REVOKED * are freed. Since
# you can retain a reference to a single revoked certificate
# and let the CRL fall out of scope we need to retain a
# private reference to the CRL inside the RevokedCertificate
# object to prevent the gc from being called inappropriately.
self._crl = crl
self._x509_revoked = x509_revoked
@property
def serial_number(self):
asn1_int = self._backend._lib.X509_REVOKED_get0_serialNumber(
self._x509_revoked
)
self._backend.openssl_assert(asn1_int != self._backend._ffi.NULL)
return _asn1_integer_to_int(self._backend, asn1_int)
@property
def revocation_date(self):
return _parse_asn1_time(
self._backend,
self._backend._lib.X509_REVOKED_get0_revocationDate(
self._x509_revoked
),
)
@utils.cached_property
def extensions(self):
return self._backend._revoked_cert_extension_parser.parse(
self._x509_revoked
)
@utils.register_interface(x509.CertificateRevocationList)
class _CertificateRevocationList(object):
def __init__(self, backend, x509_crl):
self._backend = backend
self._x509_crl = x509_crl
def __eq__(self, other):
if not isinstance(other, x509.CertificateRevocationList):
return NotImplemented
res = self._backend._lib.X509_CRL_cmp(self._x509_crl, other._x509_crl)
return res == 0
def __ne__(self, other):
return not self == other
def fingerprint(self, algorithm):
h = hashes.Hash(algorithm, self._backend)
bio = self._backend._create_mem_bio_gc()
res = self._backend._lib.i2d_X509_CRL_bio(bio, self._x509_crl)
self._backend.openssl_assert(res == 1)
der = self._backend._read_mem_bio(bio)
h.update(der)
return h.finalize()
@utils.cached_property
def _sorted_crl(self):
# X509_CRL_get0_by_serial sorts in place, which breaks a variety of
# things we don't want to break (like iteration and the signature).
# Let's dupe it and sort that instead.
dup = self._backend._lib.X509_CRL_dup(self._x509_crl)
self._backend.openssl_assert(dup != self._backend._ffi.NULL)
dup = self._backend._ffi.gc(dup, self._backend._lib.X509_CRL_free)
return dup
def get_revoked_certificate_by_serial_number(self, serial_number):
revoked = self._backend._ffi.new("X509_REVOKED **")
asn1_int = _encode_asn1_int_gc(self._backend, serial_number)
res = self._backend._lib.X509_CRL_get0_by_serial(
self._sorted_crl, revoked, asn1_int
)
if res == 0:
return None
else:
self._backend.openssl_assert(revoked[0] != self._backend._ffi.NULL)
return _RevokedCertificate(
self._backend, self._sorted_crl, revoked[0]
)
@property
def signature_hash_algorithm(self):
oid = self.signature_algorithm_oid
try:
return x509._SIG_OIDS_TO_HASH[oid]
except KeyError:
raise UnsupportedAlgorithm(
"Signature algorithm OID:{} not recognized".format(oid)
)
@property
def signature_algorithm_oid(self):
alg = self._backend._ffi.new("X509_ALGOR **")
self._backend._lib.X509_CRL_get0_signature(
self._x509_crl, self._backend._ffi.NULL, alg
)
self._backend.openssl_assert(alg[0] != self._backend._ffi.NULL)
oid = _obj2txt(self._backend, alg[0].algorithm)
return x509.ObjectIdentifier(oid)
@property
def issuer(self):
issuer = self._backend._lib.X509_CRL_get_issuer(self._x509_crl)
self._backend.openssl_assert(issuer != self._backend._ffi.NULL)
return _decode_x509_name(self._backend, issuer)
@property
def next_update(self):
nu = self._backend._lib.X509_CRL_get_nextUpdate(self._x509_crl)
self._backend.openssl_assert(nu != self._backend._ffi.NULL)
return _parse_asn1_time(self._backend, nu)
@property
def last_update(self):
lu = self._backend._lib.X509_CRL_get_lastUpdate(self._x509_crl)
self._backend.openssl_assert(lu != self._backend._ffi.NULL)
return _parse_asn1_time(self._backend, lu)
@property
def signature(self):
sig = self._backend._ffi.new("ASN1_BIT_STRING **")
self._backend._lib.X509_CRL_get0_signature(
self._x509_crl, sig, self._backend._ffi.NULL
)
self._backend.openssl_assert(sig[0] != self._backend._ffi.NULL)
return _asn1_string_to_bytes(self._backend, sig[0])
@property
def tbs_certlist_bytes(self):
pp = self._backend._ffi.new("unsigned char **")
res = self._backend._lib.i2d_re_X509_CRL_tbs(self._x509_crl, pp)
self._backend.openssl_assert(res > 0)
pp = self._backend._ffi.gc(
pp, lambda pointer: self._backend._lib.OPENSSL_free(pointer[0])
)
return self._backend._ffi.buffer(pp[0], res)[:]
def public_bytes(self, encoding):
bio = self._backend._create_mem_bio_gc()
if encoding is serialization.Encoding.PEM:
res = self._backend._lib.PEM_write_bio_X509_CRL(
bio, self._x509_crl
)
elif encoding is serialization.Encoding.DER:
res = self._backend._lib.i2d_X509_CRL_bio(bio, self._x509_crl)
else:
raise TypeError("encoding must be an item from the Encoding enum")
self._backend.openssl_assert(res == 1)
return self._backend._read_mem_bio(bio)
def _revoked_cert(self, idx):
revoked = self._backend._lib.X509_CRL_get_REVOKED(self._x509_crl)
r = self._backend._lib.sk_X509_REVOKED_value(revoked, idx)
self._backend.openssl_assert(r != self._backend._ffi.NULL)
return _RevokedCertificate(self._backend, self, r)
def __iter__(self):
for i in range(len(self)):
yield self._revoked_cert(i)
def __getitem__(self, idx):
if isinstance(idx, slice):
start, stop, step = idx.indices(len(self))
return [self._revoked_cert(i) for i in range(start, stop, step)]
else:
idx = operator.index(idx)
if idx < 0:
idx += len(self)
if not 0 <= idx < len(self):
raise IndexError
return self._revoked_cert(idx)
def __len__(self):
revoked = self._backend._lib.X509_CRL_get_REVOKED(self._x509_crl)
if revoked == self._backend._ffi.NULL:
return 0
else:
return self._backend._lib.sk_X509_REVOKED_num(revoked)
@utils.cached_property
def extensions(self):
return self._backend._crl_extension_parser.parse(self._x509_crl)
def is_signature_valid(self, public_key):
if not isinstance(
public_key,
(dsa.DSAPublicKey, rsa.RSAPublicKey, ec.EllipticCurvePublicKey),
):
raise TypeError(
"Expecting one of DSAPublicKey, RSAPublicKey,"
" or EllipticCurvePublicKey."
)
res = self._backend._lib.X509_CRL_verify(
self._x509_crl, public_key._evp_pkey
)
if res != 1:
self._backend._consume_errors()
return False
return True
@utils.register_interface(x509.CertificateSigningRequest)
class _CertificateSigningRequest(object):
def __init__(self, backend, x509_req):
self._backend = backend
self._x509_req = x509_req
def __eq__(self, other):
if not isinstance(other, _CertificateSigningRequest):
return NotImplemented
self_bytes = self.public_bytes(serialization.Encoding.DER)
other_bytes = other.public_bytes(serialization.Encoding.DER)
return self_bytes == other_bytes
def __ne__(self, other):
return not self == other
def __hash__(self):
return hash(self.public_bytes(serialization.Encoding.DER))
def public_key(self):
pkey = self._backend._lib.X509_REQ_get_pubkey(self._x509_req)
self._backend.openssl_assert(pkey != self._backend._ffi.NULL)
pkey = self._backend._ffi.gc(pkey, self._backend._lib.EVP_PKEY_free)
return self._backend._evp_pkey_to_public_key(pkey)
@property
def subject(self):
subject = self._backend._lib.X509_REQ_get_subject_name(self._x509_req)
self._backend.openssl_assert(subject != self._backend._ffi.NULL)
return _decode_x509_name(self._backend, subject)
@property
def signature_hash_algorithm(self):
oid = self.signature_algorithm_oid
try:
return x509._SIG_OIDS_TO_HASH[oid]
except KeyError:
raise UnsupportedAlgorithm(
"Signature algorithm OID:{} not recognized".format(oid)
)
@property
def signature_algorithm_oid(self):
alg = self._backend._ffi.new("X509_ALGOR **")
self._backend._lib.X509_REQ_get0_signature(
self._x509_req, self._backend._ffi.NULL, alg
)
self._backend.openssl_assert(alg[0] != self._backend._ffi.NULL)
oid = _obj2txt(self._backend, alg[0].algorithm)
return x509.ObjectIdentifier(oid)
@utils.cached_property
def extensions(self):
x509_exts = self._backend._lib.X509_REQ_get_extensions(self._x509_req)
x509_exts = self._backend._ffi.gc(
x509_exts,
lambda x: self._backend._lib.sk_X509_EXTENSION_pop_free(
x,
self._backend._ffi.addressof(
self._backend._lib._original_lib, "X509_EXTENSION_free"
),
),
)
return self._backend._csr_extension_parser.parse(x509_exts)
def public_bytes(self, encoding):
bio = self._backend._create_mem_bio_gc()
if encoding is serialization.Encoding.PEM:
res = self._backend._lib.PEM_write_bio_X509_REQ(
bio, self._x509_req
)
elif encoding is serialization.Encoding.DER:
res = self._backend._lib.i2d_X509_REQ_bio(bio, self._x509_req)
else:
raise TypeError("encoding must be an item from the Encoding enum")
self._backend.openssl_assert(res == 1)
return self._backend._read_mem_bio(bio)
@property
def tbs_certrequest_bytes(self):
pp = self._backend._ffi.new("unsigned char **")
res = self._backend._lib.i2d_re_X509_REQ_tbs(self._x509_req, pp)
self._backend.openssl_assert(res > 0)
pp = self._backend._ffi.gc(
pp, lambda pointer: self._backend._lib.OPENSSL_free(pointer[0])
)
return self._backend._ffi.buffer(pp[0], res)[:]
@property
def signature(self):
sig = self._backend._ffi.new("ASN1_BIT_STRING **")
self._backend._lib.X509_REQ_get0_signature(
self._x509_req, sig, self._backend._ffi.NULL
)
self._backend.openssl_assert(sig[0] != self._backend._ffi.NULL)
return _asn1_string_to_bytes(self._backend, sig[0])
@property
def is_signature_valid(self):
pkey = self._backend._lib.X509_REQ_get_pubkey(self._x509_req)
self._backend.openssl_assert(pkey != self._backend._ffi.NULL)
pkey = self._backend._ffi.gc(pkey, self._backend._lib.EVP_PKEY_free)
res = self._backend._lib.X509_REQ_verify(self._x509_req, pkey)
if res != 1:
self._backend._consume_errors()
return False
return True
def get_attribute_for_oid(self, oid):
obj = _txt2obj_gc(self._backend, oid.dotted_string)
pos = self._backend._lib.X509_REQ_get_attr_by_OBJ(
self._x509_req, obj, -1
)
if pos == -1:
raise x509.AttributeNotFound(
"No {} attribute was found".format(oid), oid
)
attr = self._backend._lib.X509_REQ_get_attr(self._x509_req, pos)
self._backend.openssl_assert(attr != self._backend._ffi.NULL)
# We don't support multiple valued attributes for now.
self._backend.openssl_assert(
self._backend._lib.X509_ATTRIBUTE_count(attr) == 1
)
asn1_type = self._backend._lib.X509_ATTRIBUTE_get0_type(attr, 0)
self._backend.openssl_assert(asn1_type != self._backend._ffi.NULL)
# We need this to ensure that our C type cast is safe.
# Also this should always be a sane string type, but we'll see if
# that is true in the real world...
if asn1_type.type not in (
_ASN1Type.UTF8String.value,
_ASN1Type.PrintableString.value,
_ASN1Type.IA5String.value,
):
raise ValueError(
"OID {} has a disallowed ASN.1 type: {}".format(
oid, asn1_type.type
)
)
data = self._backend._lib.X509_ATTRIBUTE_get0_data(
attr, 0, asn1_type.type, self._backend._ffi.NULL
)
self._backend.openssl_assert(data != self._backend._ffi.NULL)
# This cast is safe iff we assert on the type above to ensure
# that it is always a type of ASN1_STRING
data = self._backend._ffi.cast("ASN1_STRING *", data)
return _asn1_string_to_bytes(self._backend, data)
@utils.register_interface(
x509.certificate_transparency.SignedCertificateTimestamp
)
class _SignedCertificateTimestamp(object):
def __init__(self, backend, sct_list, sct):
self._backend = backend
# Keep the SCT_LIST that this SCT came from alive.
self._sct_list = sct_list
self._sct = sct
@property
def version(self):
version = self._backend._lib.SCT_get_version(self._sct)
assert version == self._backend._lib.SCT_VERSION_V1
return x509.certificate_transparency.Version.v1
@property
def log_id(self):
out = self._backend._ffi.new("unsigned char **")
log_id_length = self._backend._lib.SCT_get0_log_id(self._sct, out)
assert log_id_length >= 0
return self._backend._ffi.buffer(out[0], log_id_length)[:]
@property
def timestamp(self):
timestamp = self._backend._lib.SCT_get_timestamp(self._sct)
milliseconds = timestamp % 1000
return datetime.datetime.utcfromtimestamp(timestamp // 1000).replace(
microsecond=milliseconds * 1000
)
@property
def entry_type(self):
entry_type = self._backend._lib.SCT_get_log_entry_type(self._sct)
# We currently only support loading SCTs from the X.509 extension, so
# we only have precerts.
assert entry_type == self._backend._lib.CT_LOG_ENTRY_TYPE_PRECERT
return x509.certificate_transparency.LogEntryType.PRE_CERTIFICATE
@property
def _signature(self):
ptrptr = self._backend._ffi.new("unsigned char **")
res = self._backend._lib.SCT_get0_signature(self._sct, ptrptr)
self._backend.openssl_assert(res > 0)
self._backend.openssl_assert(ptrptr[0] != self._backend._ffi.NULL)
return self._backend._ffi.buffer(ptrptr[0], res)[:]
def __hash__(self):
return hash(self._signature)
def __eq__(self, other):
if not isinstance(other, _SignedCertificateTimestamp):
return NotImplemented
return self._signature == other._signature
def __ne__(self, other):
return not self == other
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