mirror of
https://github.com/PiBrewing/craftbeerpi4.git
synced 2024-12-05 04:55:06 +01:00
173 lines
5.7 KiB
Python
173 lines
5.7 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
|
||
|
|
||
|
import collections
|
||
|
import threading
|
||
|
import types
|
||
|
|
||
|
import cryptography
|
||
|
from cryptography import utils
|
||
|
from cryptography.exceptions import InternalError
|
||
|
from cryptography.hazmat.bindings._openssl import ffi, lib
|
||
|
from cryptography.hazmat.bindings.openssl._conditional import CONDITIONAL_NAMES
|
||
|
|
||
|
_OpenSSLErrorWithText = collections.namedtuple(
|
||
|
"_OpenSSLErrorWithText", ["code", "lib", "func", "reason", "reason_text"]
|
||
|
)
|
||
|
|
||
|
|
||
|
class _OpenSSLError(object):
|
||
|
def __init__(self, code, lib, func, reason):
|
||
|
self._code = code
|
||
|
self._lib = lib
|
||
|
self._func = func
|
||
|
self._reason = reason
|
||
|
|
||
|
def _lib_reason_match(self, lib, reason):
|
||
|
return lib == self.lib and reason == self.reason
|
||
|
|
||
|
code = utils.read_only_property("_code")
|
||
|
lib = utils.read_only_property("_lib")
|
||
|
func = utils.read_only_property("_func")
|
||
|
reason = utils.read_only_property("_reason")
|
||
|
|
||
|
|
||
|
def _consume_errors(lib):
|
||
|
errors = []
|
||
|
while True:
|
||
|
code = lib.ERR_get_error()
|
||
|
if code == 0:
|
||
|
break
|
||
|
|
||
|
err_lib = lib.ERR_GET_LIB(code)
|
||
|
err_func = lib.ERR_GET_FUNC(code)
|
||
|
err_reason = lib.ERR_GET_REASON(code)
|
||
|
|
||
|
errors.append(_OpenSSLError(code, err_lib, err_func, err_reason))
|
||
|
|
||
|
return errors
|
||
|
|
||
|
|
||
|
def _errors_with_text(errors):
|
||
|
errors_with_text = []
|
||
|
for err in errors:
|
||
|
buf = ffi.new("char[]", 256)
|
||
|
lib.ERR_error_string_n(err.code, buf, len(buf))
|
||
|
err_text_reason = ffi.string(buf)
|
||
|
|
||
|
errors_with_text.append(
|
||
|
_OpenSSLErrorWithText(
|
||
|
err.code, err.lib, err.func, err.reason, err_text_reason
|
||
|
)
|
||
|
)
|
||
|
|
||
|
return errors_with_text
|
||
|
|
||
|
|
||
|
def _consume_errors_with_text(lib):
|
||
|
return _errors_with_text(_consume_errors(lib))
|
||
|
|
||
|
|
||
|
def _openssl_assert(lib, ok, errors=None):
|
||
|
if not ok:
|
||
|
if errors is None:
|
||
|
errors = _consume_errors(lib)
|
||
|
errors_with_text = _errors_with_text(errors)
|
||
|
|
||
|
raise InternalError(
|
||
|
"Unknown OpenSSL error. This error is commonly encountered when "
|
||
|
"another library is not cleaning up the OpenSSL error stack. If "
|
||
|
"you are using cryptography with another library that uses "
|
||
|
"OpenSSL try disabling it before reporting a bug. Otherwise "
|
||
|
"please file an issue at https://github.com/pyca/cryptography/"
|
||
|
"issues with information on how to reproduce "
|
||
|
"this. ({0!r})".format(errors_with_text),
|
||
|
errors_with_text,
|
||
|
)
|
||
|
|
||
|
|
||
|
def build_conditional_library(lib, conditional_names):
|
||
|
conditional_lib = types.ModuleType("lib")
|
||
|
conditional_lib._original_lib = lib
|
||
|
excluded_names = set()
|
||
|
for condition, names_cb in conditional_names.items():
|
||
|
if not getattr(lib, condition):
|
||
|
excluded_names.update(names_cb())
|
||
|
|
||
|
for attr in dir(lib):
|
||
|
if attr not in excluded_names:
|
||
|
setattr(conditional_lib, attr, getattr(lib, attr))
|
||
|
|
||
|
return conditional_lib
|
||
|
|
||
|
|
||
|
class Binding(object):
|
||
|
"""
|
||
|
OpenSSL API wrapper.
|
||
|
"""
|
||
|
|
||
|
lib = None
|
||
|
ffi = ffi
|
||
|
_lib_loaded = False
|
||
|
_init_lock = threading.Lock()
|
||
|
|
||
|
def __init__(self):
|
||
|
self._ensure_ffi_initialized()
|
||
|
|
||
|
@classmethod
|
||
|
def _register_osrandom_engine(cls):
|
||
|
# Clear any errors extant in the queue before we start. In many
|
||
|
# scenarios other things may be interacting with OpenSSL in the same
|
||
|
# process space and it has proven untenable to assume that they will
|
||
|
# reliably clear the error queue. Once we clear it here we will
|
||
|
# error on any subsequent unexpected item in the stack.
|
||
|
cls.lib.ERR_clear_error()
|
||
|
if cls.lib.CRYPTOGRAPHY_NEEDS_OSRANDOM_ENGINE:
|
||
|
result = cls.lib.Cryptography_add_osrandom_engine()
|
||
|
_openssl_assert(cls.lib, result in (1, 2))
|
||
|
|
||
|
@classmethod
|
||
|
def _ensure_ffi_initialized(cls):
|
||
|
with cls._init_lock:
|
||
|
if not cls._lib_loaded:
|
||
|
cls.lib = build_conditional_library(lib, CONDITIONAL_NAMES)
|
||
|
cls._lib_loaded = True
|
||
|
# initialize the SSL library
|
||
|
cls.lib.SSL_library_init()
|
||
|
# adds all ciphers/digests for EVP
|
||
|
cls.lib.OpenSSL_add_all_algorithms()
|
||
|
cls._register_osrandom_engine()
|
||
|
|
||
|
@classmethod
|
||
|
def init_static_locks(cls):
|
||
|
cls._ensure_ffi_initialized()
|
||
|
|
||
|
|
||
|
def _verify_package_version(version):
|
||
|
# Occasionally we run into situations where the version of the Python
|
||
|
# package does not match the version of the shared object that is loaded.
|
||
|
# This may occur in environments where multiple versions of cryptography
|
||
|
# are installed and available in the python path. To avoid errors cropping
|
||
|
# up later this code checks that the currently imported package and the
|
||
|
# shared object that were loaded have the same version and raise an
|
||
|
# ImportError if they do not
|
||
|
so_package_version = ffi.string(lib.CRYPTOGRAPHY_PACKAGE_VERSION)
|
||
|
if version.encode("ascii") != so_package_version:
|
||
|
raise ImportError(
|
||
|
"The version of cryptography does not match the loaded "
|
||
|
"shared object. This can happen if you have multiple copies of "
|
||
|
"cryptography installed in your Python path. Please try creating "
|
||
|
"a new virtual environment to resolve this issue. "
|
||
|
"Loaded python version: {}, shared object version: {}".format(
|
||
|
version, so_package_version
|
||
|
)
|
||
|
)
|
||
|
|
||
|
|
||
|
_verify_package_version(cryptography.__version__)
|
||
|
|
||
|
Binding.init_static_locks()
|