mirror of
https://github.com/thegeeklab/ansible-later.git
synced 2024-08-23 08:22:19 +02:00
341 lines
12 KiB
Python
341 lines
12 KiB
Python
![]() |
# 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
|
||
|
|
||
|
from cryptography import utils
|
||
|
from cryptography.exceptions import (
|
||
|
InvalidSignature, UnsupportedAlgorithm, _Reasons
|
||
|
)
|
||
|
from cryptography.hazmat.backends.openssl.utils import (
|
||
|
_calculate_digest_and_algorithm, _check_not_prehashed,
|
||
|
_warn_sign_verify_deprecated
|
||
|
)
|
||
|
from cryptography.hazmat.primitives import hashes, serialization
|
||
|
from cryptography.hazmat.primitives.asymmetric import (
|
||
|
AsymmetricSignatureContext, AsymmetricVerificationContext, ec
|
||
|
)
|
||
|
|
||
|
|
||
|
def _check_signature_algorithm(signature_algorithm):
|
||
|
if not isinstance(signature_algorithm, ec.ECDSA):
|
||
|
raise UnsupportedAlgorithm(
|
||
|
"Unsupported elliptic curve signature algorithm.",
|
||
|
_Reasons.UNSUPPORTED_PUBLIC_KEY_ALGORITHM)
|
||
|
|
||
|
|
||
|
def _ec_key_curve_sn(backend, ec_key):
|
||
|
group = backend._lib.EC_KEY_get0_group(ec_key)
|
||
|
backend.openssl_assert(group != backend._ffi.NULL)
|
||
|
|
||
|
nid = backend._lib.EC_GROUP_get_curve_name(group)
|
||
|
# The following check is to find EC keys with unnamed curves and raise
|
||
|
# an error for now.
|
||
|
if nid == backend._lib.NID_undef:
|
||
|
raise NotImplementedError(
|
||
|
"ECDSA certificates with unnamed curves are unsupported "
|
||
|
"at this time"
|
||
|
)
|
||
|
|
||
|
curve_name = backend._lib.OBJ_nid2sn(nid)
|
||
|
backend.openssl_assert(curve_name != backend._ffi.NULL)
|
||
|
|
||
|
sn = backend._ffi.string(curve_name).decode('ascii')
|
||
|
return sn
|
||
|
|
||
|
|
||
|
def _mark_asn1_named_ec_curve(backend, ec_cdata):
|
||
|
"""
|
||
|
Set the named curve flag on the EC_KEY. This causes OpenSSL to
|
||
|
serialize EC keys along with their curve OID which makes
|
||
|
deserialization easier.
|
||
|
"""
|
||
|
|
||
|
backend._lib.EC_KEY_set_asn1_flag(
|
||
|
ec_cdata, backend._lib.OPENSSL_EC_NAMED_CURVE
|
||
|
)
|
||
|
|
||
|
|
||
|
def _sn_to_elliptic_curve(backend, sn):
|
||
|
try:
|
||
|
return ec._CURVE_TYPES[sn]()
|
||
|
except KeyError:
|
||
|
raise UnsupportedAlgorithm(
|
||
|
"{} is not a supported elliptic curve".format(sn),
|
||
|
_Reasons.UNSUPPORTED_ELLIPTIC_CURVE
|
||
|
)
|
||
|
|
||
|
|
||
|
def _ecdsa_sig_sign(backend, private_key, data):
|
||
|
max_size = backend._lib.ECDSA_size(private_key._ec_key)
|
||
|
backend.openssl_assert(max_size > 0)
|
||
|
|
||
|
sigbuf = backend._ffi.new("unsigned char[]", max_size)
|
||
|
siglen_ptr = backend._ffi.new("unsigned int[]", 1)
|
||
|
res = backend._lib.ECDSA_sign(
|
||
|
0, data, len(data), sigbuf, siglen_ptr, private_key._ec_key
|
||
|
)
|
||
|
backend.openssl_assert(res == 1)
|
||
|
return backend._ffi.buffer(sigbuf)[:siglen_ptr[0]]
|
||
|
|
||
|
|
||
|
def _ecdsa_sig_verify(backend, public_key, signature, data):
|
||
|
res = backend._lib.ECDSA_verify(
|
||
|
0, data, len(data), signature, len(signature), public_key._ec_key
|
||
|
)
|
||
|
if res != 1:
|
||
|
backend._consume_errors()
|
||
|
raise InvalidSignature
|
||
|
|
||
|
|
||
|
@utils.register_interface(AsymmetricSignatureContext)
|
||
|
class _ECDSASignatureContext(object):
|
||
|
def __init__(self, backend, private_key, algorithm):
|
||
|
self._backend = backend
|
||
|
self._private_key = private_key
|
||
|
self._digest = hashes.Hash(algorithm, backend)
|
||
|
|
||
|
def update(self, data):
|
||
|
self._digest.update(data)
|
||
|
|
||
|
def finalize(self):
|
||
|
digest = self._digest.finalize()
|
||
|
|
||
|
return _ecdsa_sig_sign(self._backend, self._private_key, digest)
|
||
|
|
||
|
|
||
|
@utils.register_interface(AsymmetricVerificationContext)
|
||
|
class _ECDSAVerificationContext(object):
|
||
|
def __init__(self, backend, public_key, signature, algorithm):
|
||
|
self._backend = backend
|
||
|
self._public_key = public_key
|
||
|
self._signature = signature
|
||
|
self._digest = hashes.Hash(algorithm, backend)
|
||
|
|
||
|
def update(self, data):
|
||
|
self._digest.update(data)
|
||
|
|
||
|
def verify(self):
|
||
|
digest = self._digest.finalize()
|
||
|
_ecdsa_sig_verify(
|
||
|
self._backend, self._public_key, self._signature, digest
|
||
|
)
|
||
|
|
||
|
|
||
|
@utils.register_interface(ec.EllipticCurvePrivateKeyWithSerialization)
|
||
|
class _EllipticCurvePrivateKey(object):
|
||
|
def __init__(self, backend, ec_key_cdata, evp_pkey):
|
||
|
self._backend = backend
|
||
|
_mark_asn1_named_ec_curve(backend, ec_key_cdata)
|
||
|
self._ec_key = ec_key_cdata
|
||
|
self._evp_pkey = evp_pkey
|
||
|
|
||
|
sn = _ec_key_curve_sn(backend, ec_key_cdata)
|
||
|
self._curve = _sn_to_elliptic_curve(backend, sn)
|
||
|
|
||
|
curve = utils.read_only_property("_curve")
|
||
|
|
||
|
@property
|
||
|
def key_size(self):
|
||
|
return self.curve.key_size
|
||
|
|
||
|
def signer(self, signature_algorithm):
|
||
|
_warn_sign_verify_deprecated()
|
||
|
_check_signature_algorithm(signature_algorithm)
|
||
|
_check_not_prehashed(signature_algorithm.algorithm)
|
||
|
return _ECDSASignatureContext(
|
||
|
self._backend, self, signature_algorithm.algorithm
|
||
|
)
|
||
|
|
||
|
def exchange(self, algorithm, peer_public_key):
|
||
|
if not (
|
||
|
self._backend.elliptic_curve_exchange_algorithm_supported(
|
||
|
algorithm, self.curve
|
||
|
)
|
||
|
):
|
||
|
raise UnsupportedAlgorithm(
|
||
|
"This backend does not support the ECDH algorithm.",
|
||
|
_Reasons.UNSUPPORTED_EXCHANGE_ALGORITHM
|
||
|
)
|
||
|
|
||
|
if peer_public_key.curve.name != self.curve.name:
|
||
|
raise ValueError(
|
||
|
"peer_public_key and self are not on the same curve"
|
||
|
)
|
||
|
|
||
|
group = self._backend._lib.EC_KEY_get0_group(self._ec_key)
|
||
|
z_len = (self._backend._lib.EC_GROUP_get_degree(group) + 7) // 8
|
||
|
self._backend.openssl_assert(z_len > 0)
|
||
|
z_buf = self._backend._ffi.new("uint8_t[]", z_len)
|
||
|
peer_key = self._backend._lib.EC_KEY_get0_public_key(
|
||
|
peer_public_key._ec_key
|
||
|
)
|
||
|
|
||
|
r = self._backend._lib.ECDH_compute_key(
|
||
|
z_buf, z_len, peer_key, self._ec_key, self._backend._ffi.NULL
|
||
|
)
|
||
|
self._backend.openssl_assert(r > 0)
|
||
|
return self._backend._ffi.buffer(z_buf)[:z_len]
|
||
|
|
||
|
def public_key(self):
|
||
|
group = self._backend._lib.EC_KEY_get0_group(self._ec_key)
|
||
|
self._backend.openssl_assert(group != self._backend._ffi.NULL)
|
||
|
|
||
|
curve_nid = self._backend._lib.EC_GROUP_get_curve_name(group)
|
||
|
|
||
|
public_ec_key = self._backend._lib.EC_KEY_new_by_curve_name(curve_nid)
|
||
|
self._backend.openssl_assert(public_ec_key != self._backend._ffi.NULL)
|
||
|
public_ec_key = self._backend._ffi.gc(
|
||
|
public_ec_key, self._backend._lib.EC_KEY_free
|
||
|
)
|
||
|
|
||
|
point = self._backend._lib.EC_KEY_get0_public_key(self._ec_key)
|
||
|
self._backend.openssl_assert(point != self._backend._ffi.NULL)
|
||
|
|
||
|
res = self._backend._lib.EC_KEY_set_public_key(public_ec_key, point)
|
||
|
self._backend.openssl_assert(res == 1)
|
||
|
|
||
|
evp_pkey = self._backend._ec_cdata_to_evp_pkey(public_ec_key)
|
||
|
|
||
|
return _EllipticCurvePublicKey(self._backend, public_ec_key, evp_pkey)
|
||
|
|
||
|
def private_numbers(self):
|
||
|
bn = self._backend._lib.EC_KEY_get0_private_key(self._ec_key)
|
||
|
private_value = self._backend._bn_to_int(bn)
|
||
|
return ec.EllipticCurvePrivateNumbers(
|
||
|
private_value=private_value,
|
||
|
public_numbers=self.public_key().public_numbers()
|
||
|
)
|
||
|
|
||
|
def private_bytes(self, encoding, format, encryption_algorithm):
|
||
|
return self._backend._private_key_bytes(
|
||
|
encoding,
|
||
|
format,
|
||
|
encryption_algorithm,
|
||
|
self._evp_pkey,
|
||
|
self._ec_key
|
||
|
)
|
||
|
|
||
|
def sign(self, data, signature_algorithm):
|
||
|
_check_signature_algorithm(signature_algorithm)
|
||
|
data, algorithm = _calculate_digest_and_algorithm(
|
||
|
self._backend, data, signature_algorithm._algorithm
|
||
|
)
|
||
|
return _ecdsa_sig_sign(self._backend, self, data)
|
||
|
|
||
|
|
||
|
@utils.register_interface(ec.EllipticCurvePublicKeyWithSerialization)
|
||
|
class _EllipticCurvePublicKey(object):
|
||
|
def __init__(self, backend, ec_key_cdata, evp_pkey):
|
||
|
self._backend = backend
|
||
|
_mark_asn1_named_ec_curve(backend, ec_key_cdata)
|
||
|
self._ec_key = ec_key_cdata
|
||
|
self._evp_pkey = evp_pkey
|
||
|
|
||
|
sn = _ec_key_curve_sn(backend, ec_key_cdata)
|
||
|
self._curve = _sn_to_elliptic_curve(backend, sn)
|
||
|
|
||
|
curve = utils.read_only_property("_curve")
|
||
|
|
||
|
@property
|
||
|
def key_size(self):
|
||
|
return self.curve.key_size
|
||
|
|
||
|
def verifier(self, signature, signature_algorithm):
|
||
|
_warn_sign_verify_deprecated()
|
||
|
utils._check_bytes("signature", signature)
|
||
|
|
||
|
_check_signature_algorithm(signature_algorithm)
|
||
|
_check_not_prehashed(signature_algorithm.algorithm)
|
||
|
return _ECDSAVerificationContext(
|
||
|
self._backend, self, signature, signature_algorithm.algorithm
|
||
|
)
|
||
|
|
||
|
def public_numbers(self):
|
||
|
get_func, group = (
|
||
|
self._backend._ec_key_determine_group_get_func(self._ec_key)
|
||
|
)
|
||
|
point = self._backend._lib.EC_KEY_get0_public_key(self._ec_key)
|
||
|
self._backend.openssl_assert(point != self._backend._ffi.NULL)
|
||
|
|
||
|
with self._backend._tmp_bn_ctx() as bn_ctx:
|
||
|
bn_x = self._backend._lib.BN_CTX_get(bn_ctx)
|
||
|
bn_y = self._backend._lib.BN_CTX_get(bn_ctx)
|
||
|
|
||
|
res = get_func(group, point, bn_x, bn_y, bn_ctx)
|
||
|
self._backend.openssl_assert(res == 1)
|
||
|
|
||
|
x = self._backend._bn_to_int(bn_x)
|
||
|
y = self._backend._bn_to_int(bn_y)
|
||
|
|
||
|
return ec.EllipticCurvePublicNumbers(
|
||
|
x=x,
|
||
|
y=y,
|
||
|
curve=self._curve
|
||
|
)
|
||
|
|
||
|
def _encode_point(self, format):
|
||
|
if format is serialization.PublicFormat.CompressedPoint:
|
||
|
conversion = self._backend._lib.POINT_CONVERSION_COMPRESSED
|
||
|
else:
|
||
|
assert format is serialization.PublicFormat.UncompressedPoint
|
||
|
conversion = self._backend._lib.POINT_CONVERSION_UNCOMPRESSED
|
||
|
|
||
|
group = self._backend._lib.EC_KEY_get0_group(self._ec_key)
|
||
|
self._backend.openssl_assert(group != self._backend._ffi.NULL)
|
||
|
point = self._backend._lib.EC_KEY_get0_public_key(self._ec_key)
|
||
|
self._backend.openssl_assert(point != self._backend._ffi.NULL)
|
||
|
with self._backend._tmp_bn_ctx() as bn_ctx:
|
||
|
buflen = self._backend._lib.EC_POINT_point2oct(
|
||
|
group, point, conversion, self._backend._ffi.NULL, 0, bn_ctx
|
||
|
)
|
||
|
self._backend.openssl_assert(buflen > 0)
|
||
|
buf = self._backend._ffi.new("char[]", buflen)
|
||
|
res = self._backend._lib.EC_POINT_point2oct(
|
||
|
group, point, conversion, buf, buflen, bn_ctx
|
||
|
)
|
||
|
self._backend.openssl_assert(buflen == res)
|
||
|
|
||
|
return self._backend._ffi.buffer(buf)[:]
|
||
|
|
||
|
def public_bytes(self, encoding, format):
|
||
|
if format is serialization.PublicFormat.PKCS1:
|
||
|
raise ValueError(
|
||
|
"EC public keys do not support PKCS1 serialization"
|
||
|
)
|
||
|
|
||
|
if (
|
||
|
encoding is serialization.Encoding.X962 or
|
||
|
format is serialization.PublicFormat.CompressedPoint or
|
||
|
format is serialization.PublicFormat.UncompressedPoint
|
||
|
):
|
||
|
if (
|
||
|
encoding is not serialization.Encoding.X962 or
|
||
|
format not in (
|
||
|
serialization.PublicFormat.CompressedPoint,
|
||
|
serialization.PublicFormat.UncompressedPoint
|
||
|
)
|
||
|
):
|
||
|
raise ValueError(
|
||
|
"X962 encoding must be used with CompressedPoint or "
|
||
|
"UncompressedPoint format"
|
||
|
)
|
||
|
|
||
|
return self._encode_point(format)
|
||
|
else:
|
||
|
return self._backend._public_key_bytes(
|
||
|
encoding,
|
||
|
format,
|
||
|
self,
|
||
|
self._evp_pkey,
|
||
|
None
|
||
|
)
|
||
|
|
||
|
def verify(self, signature, data, signature_algorithm):
|
||
|
_check_signature_algorithm(signature_algorithm)
|
||
|
data, algorithm = _calculate_digest_and_algorithm(
|
||
|
self._backend, data, signature_algorithm._algorithm
|
||
|
)
|
||
|
_ecdsa_sig_verify(self._backend, self, signature, data)
|