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# Copyright 2019-present MongoDB, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Internal crypto callbacks for libmongocrypt."""
import os
import traceback
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives.asymmetric import padding
from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
from cryptography.hazmat.primitives.hashes import SHA256, SHA512, Hash
from cryptography.hazmat.primitives.hmac import HMAC
from cryptography.hazmat.primitives.serialization import load_der_private_key
from pymongocrypt.binary import _to_bytes, _write_bytes
from pymongocrypt.binding import ffi, lib
from pymongocrypt.compat import str_to_bytes
def _callback_error_handler(exception, exc_value, tb):
"""Set the mongocrypt_status_t on error."""
# From cffi docs: "First check if traceback is not None (it is None e.g.
# if the whole function ran successfully but there was an error converting
# the value returned: this occurs after the call)."
if tb is not None:
status = tb.tb_frame.f_locals["status"]
msg = str_to_bytes(
"".join(traceback.format_exception(exception, exc_value, tb))
)
lib.mongocrypt_status_set(
status, lib.MONGOCRYPT_STATUS_ERROR_CLIENT, 1, msg, -1
)
return False
def _aes_256_encrypt(key, mode, input, output, bytes_written):
cipher = Cipher(algorithms.AES(_to_bytes(key)), mode, backend=default_backend())
encryptor = cipher.encryptor()
data = encryptor.update(_to_bytes(input)) + encryptor.finalize()
_write_bytes(output, data)
bytes_written[0] = len(data)
def _aes_256_decrypt(key, mode, input, output, bytes_written):
cipher = Cipher(algorithms.AES(_to_bytes(key)), mode, backend=default_backend())
decryptor = cipher.decryptor()
data = decryptor.update(_to_bytes(input)) + decryptor.finalize()
_write_bytes(output, data)
bytes_written[0] = len(data)
@ffi.callback(
"bool(void *, mongocrypt_binary_t *, mongocrypt_binary_t *,"
" mongocrypt_binary_t *, mongocrypt_binary_t *, uint32_t *,"
" mongocrypt_status_t *)",
onerror=_callback_error_handler,
)
def aes_256_cbc_encrypt(ctx, key, iv, input, output, bytes_written, status):
# Note that libmongocrypt pads the input before calling this method.
_aes_256_encrypt(key, modes.CBC(_to_bytes(iv)), input, output, bytes_written)
return True
@ffi.callback(
"bool(void *, mongocrypt_binary_t *, mongocrypt_binary_t *,"
" mongocrypt_binary_t *, mongocrypt_binary_t *, uint32_t *,"
" mongocrypt_status_t *)",
onerror=_callback_error_handler,
)
def aes_256_cbc_decrypt(ctx, key, iv, input, output, bytes_written, status):
# Note that libmongocrypt pads the input before calling this method.
_aes_256_decrypt(key, modes.CBC(_to_bytes(iv)), input, output, bytes_written)
return True
@ffi.callback(
"bool(void *, mongocrypt_binary_t *, mongocrypt_binary_t *,"
" mongocrypt_binary_t *, mongocrypt_binary_t *, uint32_t *,"
" mongocrypt_status_t *)",
onerror=_callback_error_handler,
)
def aes_256_ctr_encrypt(ctx, key, iv, input, output, bytes_written, status):
_aes_256_encrypt(key, modes.CTR(_to_bytes(iv)), input, output, bytes_written)
return True
@ffi.callback(
"bool(void *, mongocrypt_binary_t *, mongocrypt_binary_t *,"
" mongocrypt_binary_t *, mongocrypt_binary_t *, uint32_t *,"
" mongocrypt_status_t *)",
onerror=_callback_error_handler,
)
def aes_256_ctr_decrypt(ctx, key, iv, input, output, bytes_written, status):
_aes_256_decrypt(key, modes.CTR(_to_bytes(iv)), input, output, bytes_written)
return True
@ffi.callback(
"bool(void *, mongocrypt_binary_t *, mongocrypt_binary_t *, "
" mongocrypt_binary_t *, mongocrypt_status_t *)",
onerror=_callback_error_handler,
)
def hmac_sha_256(ctx, key, input, output, status):
h = HMAC(_to_bytes(key), SHA256(), backend=default_backend())
h.update(_to_bytes(input))
data = h.finalize()
_write_bytes(output, data)
return True
@ffi.callback(
"bool(void *, mongocrypt_binary_t *, mongocrypt_binary_t *, "
" mongocrypt_binary_t *, mongocrypt_status_t *)",
onerror=_callback_error_handler,
)
def hmac_sha_512(ctx, key, input, output, status):
h = HMAC(_to_bytes(key), SHA512(), backend=default_backend())
h.update(_to_bytes(input))
data = h.finalize()
_write_bytes(output, data)
return True
@ffi.callback(
"bool(void *, mongocrypt_binary_t *, mongocrypt_binary_t *, "
" mongocrypt_status_t *)",
onerror=_callback_error_handler,
)
def sha_256(ctx, input, output, status):
digest = Hash(SHA256(), backend=default_backend())
digest.update(_to_bytes(input))
data = digest.finalize()
_write_bytes(output, data)
return True
@ffi.callback(
"bool(void *, mongocrypt_binary_t *, uint32_t, mongocrypt_status_t *)",
onerror=_callback_error_handler,
)
def secure_random(ctx, output, count, status):
data = os.urandom(int(count))
_write_bytes(output, data)
return True
@ffi.callback(
"bool(void *, mongocrypt_binary_t *, mongocrypt_binary_t *, "
" mongocrypt_binary_t *, mongocrypt_status_t *)",
onerror=_callback_error_handler,
)
def sign_rsaes_pkcs1_v1_5(ctx, key, input, output, status):
rsa_private_key = load_der_private_key(
_to_bytes(key), password=None, backend=default_backend()
)
signature = rsa_private_key.sign(
_to_bytes(input), padding=padding.PKCS1v15(), algorithm=SHA256()
)
_write_bytes(output, signature)
return True
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