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138 lines
4.5 KiB
Python
138 lines
4.5 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 annotations
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import os
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import sys
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import threading
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import types
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import typing
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import warnings
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from collections.abc import Callable
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import cryptography
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from cryptography.exceptions import InternalError
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from cryptography.hazmat.bindings._rust import _openssl, openssl
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from cryptography.hazmat.bindings.openssl._conditional import CONDITIONAL_NAMES
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from cryptography.utils import CryptographyDeprecationWarning
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def _openssl_assert(ok: bool) -> None:
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if not ok:
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errors = openssl.capture_error_stack()
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raise InternalError(
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"Unknown OpenSSL error. This error is commonly encountered when "
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"another library is not cleaning up the OpenSSL error stack. If "
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"you are using cryptography with another library that uses "
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"OpenSSL try disabling it before reporting a bug. Otherwise "
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"please file an issue at https://github.com/pyca/cryptography/"
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"issues with information on how to reproduce "
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f"this. ({errors!r})",
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errors,
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)
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def build_conditional_library(
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lib: typing.Any,
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conditional_names: dict[str, Callable[[], list[str]]],
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) -> typing.Any:
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conditional_lib = types.ModuleType("lib")
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conditional_lib._original_lib = lib # type: ignore[attr-defined]
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excluded_names = set()
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for condition, names_cb in conditional_names.items():
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if not getattr(lib, condition):
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excluded_names.update(names_cb())
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for attr in dir(lib):
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if attr not in excluded_names:
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setattr(conditional_lib, attr, getattr(lib, attr))
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return conditional_lib
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class Binding:
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"""
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OpenSSL API wrapper.
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"""
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lib: typing.ClassVar[typing.Any] = None
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ffi = _openssl.ffi
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_lib_loaded = False
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_init_lock = threading.Lock()
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def __init__(self) -> None:
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self._ensure_ffi_initialized()
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@classmethod
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def _ensure_ffi_initialized(cls) -> None:
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with cls._init_lock:
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if not cls._lib_loaded:
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cls.lib = build_conditional_library(
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_openssl.lib, CONDITIONAL_NAMES
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)
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cls._lib_loaded = True
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@classmethod
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def init_static_locks(cls) -> None:
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cls._ensure_ffi_initialized()
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def _verify_package_version(version: str) -> None:
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# Occasionally we run into situations where the version of the Python
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# package does not match the version of the shared object that is loaded.
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# This may occur in environments where multiple versions of cryptography
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# are installed and available in the python path. To avoid errors cropping
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# up later this code checks that the currently imported package and the
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# shared object that were loaded have the same version and raise an
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# ImportError if they do not
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so_package_version = _openssl.ffi.string(
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_openssl.lib.CRYPTOGRAPHY_PACKAGE_VERSION
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)
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if version.encode("ascii") != so_package_version:
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raise ImportError(
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"The version of cryptography does not match the loaded "
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"shared object. This can happen if you have multiple copies of "
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"cryptography installed in your Python path. Please try creating "
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"a new virtual environment to resolve this issue. "
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f"Loaded python version: {version}, "
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f"shared object version: {so_package_version}"
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)
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_openssl_assert(
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_openssl.lib.OpenSSL_version_num() == openssl.openssl_version(),
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)
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_verify_package_version(cryptography.__version__)
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Binding.init_static_locks()
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if (
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sys.platform == "win32"
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and os.environ.get("PROCESSOR_ARCHITEW6432") is not None
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):
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warnings.warn(
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"You are using cryptography on a 32-bit Python on a 64-bit Windows "
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"Operating System. Cryptography will be significantly faster if you "
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"switch to using a 64-bit Python.",
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UserWarning,
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stacklevel=2,
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)
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if (
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not openssl.CRYPTOGRAPHY_IS_LIBRESSL
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and not openssl.CRYPTOGRAPHY_IS_BORINGSSL
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and not openssl.CRYPTOGRAPHY_IS_AWSLC
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and not openssl.CRYPTOGRAPHY_OPENSSL_300_OR_GREATER
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):
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warnings.warn(
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"You are using OpenSSL < 3.0. Support for OpenSSL < 3.0 is deprecated "
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"and will be removed in the next release. Please upgrade to OpenSSL "
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"3.0 or later.",
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CryptographyDeprecationWarning,
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stacklevel=2,
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)
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