mirror of
https://github.com/ansible-collections/community.crypto.git
synced 2026-03-26 21:33:25 +00:00
295 lines
11 KiB
Python
295 lines
11 KiB
Python
# Copyright (c) 2022, Felix Fontein <felix@fontein.de>
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# GNU General Public License v3.0+ (see LICENSES/GPL-3.0-or-later.txt or https://www.gnu.org/licenses/gpl-3.0.txt)
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# SPDX-License-Identifier: GPL-3.0-or-later
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# Note that this module util is **PRIVATE** to the collection. It can have breaking changes at any time.
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# Do not use this from other collections or standalone plugins/modules!
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from __future__ import annotations
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import traceback
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import typing as t
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from ansible.module_utils.common.text.converters import to_bytes
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from ansible_collections.community.crypto.plugins.module_utils._argspec import (
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ArgumentSpec,
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)
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from ansible_collections.community.crypto.plugins.module_utils._crypto.basic import (
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OpenSSLObjectError,
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)
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from ansible_collections.community.crypto.plugins.module_utils._crypto.cryptography_support import (
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cryptography_compare_private_keys,
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)
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from ansible_collections.community.crypto.plugins.module_utils._crypto.pem import (
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identify_private_key_format,
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)
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from ansible_collections.community.crypto.plugins.module_utils._cryptography_dep import (
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COLLECTION_MINIMUM_CRYPTOGRAPHY_VERSION,
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assert_required_cryptography_version,
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)
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from ansible_collections.community.crypto.plugins.module_utils._io import load_file
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if t.TYPE_CHECKING:
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from ansible.module_utils.basic import AnsibleModule # pragma: no cover
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from cryptography.hazmat.primitives.asymmetric.types import ( # pragma: no cover
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PrivateKeyTypes,
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)
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MINIMAL_CRYPTOGRAPHY_VERSION = COLLECTION_MINIMUM_CRYPTOGRAPHY_VERSION
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try:
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import cryptography
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import cryptography.exceptions
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import cryptography.hazmat.backends
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import cryptography.hazmat.primitives.asymmetric.dsa
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import cryptography.hazmat.primitives.asymmetric.ec
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import cryptography.hazmat.primitives.asymmetric.ed448
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import cryptography.hazmat.primitives.asymmetric.ed25519
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import cryptography.hazmat.primitives.asymmetric.rsa
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import cryptography.hazmat.primitives.asymmetric.utils
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import cryptography.hazmat.primitives.asymmetric.x448
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import cryptography.hazmat.primitives.asymmetric.x25519
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import cryptography.hazmat.primitives.serialization
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except ImportError:
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pass
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class PrivateKeyError(OpenSSLObjectError):
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pass
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# From the object called `module`, only the following properties are used:
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#
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# - module.params[]
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# - module.warn(msg: str)
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# - module.fail_json(msg: str, **kwargs)
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class PrivateKeyConvertBackend:
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def __init__(self, *, module: AnsibleModule) -> None:
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self.module = module
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self.src_path: str | None = module.params["src_path"]
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self.src_content: str | None = module.params["src_content"]
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self.src_passphrase: str | None = module.params["src_passphrase"]
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self.format: t.Literal["pkcs1", "pkcs8", "raw"] = module.params["format"]
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self.dest_passphrase: str | None = module.params["dest_passphrase"]
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self.src_private_key: PrivateKeyTypes | None = None
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if self.src_path is not None:
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self.src_private_key_bytes = load_file(path=self.src_path, module=module)
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else:
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if self.src_content is None:
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raise AssertionError("src_content is None") # pragma: no cover
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self.src_private_key_bytes = self.src_content.encode("utf-8")
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self.dest_private_key: PrivateKeyTypes | None = None
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self.dest_private_key_bytes: bytes | None = None
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def get_private_key_data(self) -> bytes:
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"""Return bytes for self.src_private_key in output format"""
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if self.src_private_key is None:
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raise AssertionError("src_private_key not set") # pragma: no cover
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# Select export format and encoding
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try:
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export_encoding = cryptography.hazmat.primitives.serialization.Encoding.PEM
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if self.format == "pkcs1":
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# "TraditionalOpenSSL" format is PKCS1
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export_format = (
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cryptography.hazmat.primitives.serialization.PrivateFormat.TraditionalOpenSSL
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)
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elif self.format == "pkcs8":
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export_format = (
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cryptography.hazmat.primitives.serialization.PrivateFormat.PKCS8
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)
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elif self.format == "raw":
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export_format = (
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cryptography.hazmat.primitives.serialization.PrivateFormat.Raw
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)
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export_encoding = (
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cryptography.hazmat.primitives.serialization.Encoding.Raw
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)
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else:
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# pylint does not notice that all possible values for self.format have been covered.
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raise AssertionError("Can never be reached") # pragma: no cover
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except AttributeError:
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self.module.fail_json(
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msg=f'Cryptography backend does not support the selected output format "{self.format}"'
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)
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# Select key encryption
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encryption_algorithm: (
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cryptography.hazmat.primitives.serialization.KeySerializationEncryption
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) = cryptography.hazmat.primitives.serialization.NoEncryption()
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if self.dest_passphrase:
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encryption_algorithm = (
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cryptography.hazmat.primitives.serialization.BestAvailableEncryption(
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to_bytes(self.dest_passphrase)
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)
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)
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# Serialize key
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try:
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return self.src_private_key.private_bytes(
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encoding=export_encoding,
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format=export_format,
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encryption_algorithm=encryption_algorithm,
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)
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except ValueError:
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self.module.fail_json(
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msg=f'Cryptography backend cannot serialize the private key in the required format "{self.format}"'
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)
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except Exception:
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self.module.fail_json(
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msg=f'Error while serializing the private key in the required format "{self.format}"',
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exception=traceback.format_exc(),
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)
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def set_existing_destination(self, *, privatekey_bytes: bytes | None) -> None:
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"""Set existing private key bytes. None indicates that the key does not exist."""
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self.dest_private_key_bytes = privatekey_bytes
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def has_existing_destination(self) -> bool:
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"""Query whether an existing private key is/has been there."""
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return self.dest_private_key_bytes is not None
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def _load_private_key(
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self,
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*,
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data: bytes,
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passphrase: str | None,
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current_hint: PrivateKeyTypes | None = None,
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) -> tuple[str, PrivateKeyTypes]:
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"""Check whether data can be loaded as a private key with the provided passphrase. Return tuple (type, private_key)."""
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try:
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# Interpret bytes depending on format.
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key_format = identify_private_key_format(data)
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if key_format == "raw":
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if passphrase is not None:
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raise PrivateKeyError("Cannot load raw key with passphrase")
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if len(data) == 56:
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return (
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key_format,
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cryptography.hazmat.primitives.asymmetric.x448.X448PrivateKey.from_private_bytes(
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data
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),
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)
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if len(data) == 57:
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return (
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key_format,
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cryptography.hazmat.primitives.asymmetric.ed448.Ed448PrivateKey.from_private_bytes(
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data
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),
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)
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if len(data) == 32:
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if isinstance(
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current_hint,
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cryptography.hazmat.primitives.asymmetric.x25519.X25519PrivateKey,
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):
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try:
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return (
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key_format,
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cryptography.hazmat.primitives.asymmetric.x25519.X25519PrivateKey.from_private_bytes(
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data
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),
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)
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except Exception:
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return (
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key_format,
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cryptography.hazmat.primitives.asymmetric.ed25519.Ed25519PrivateKey.from_private_bytes(
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data
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),
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)
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else:
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try:
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return (
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key_format,
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cryptography.hazmat.primitives.asymmetric.ed25519.Ed25519PrivateKey.from_private_bytes(
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data
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),
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)
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except Exception:
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return (
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key_format,
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cryptography.hazmat.primitives.asymmetric.x25519.X25519PrivateKey.from_private_bytes(
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data
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),
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)
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raise PrivateKeyError("Cannot load raw key")
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return (
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key_format,
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cryptography.hazmat.primitives.serialization.load_pem_private_key(
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data,
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None if passphrase is None else to_bytes(passphrase),
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),
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)
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except Exception as e:
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raise PrivateKeyError(e) from e
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def needs_conversion(self) -> bool:
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"""Check whether a conversion is necessary. Must only be called if needs_regeneration() returned False."""
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dummy, self.src_private_key = self._load_private_key(
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data=self.src_private_key_bytes, passphrase=self.src_passphrase
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)
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if not self.has_existing_destination():
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return True
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assert self.dest_private_key_bytes is not None
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try:
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key_format, self.dest_private_key = self._load_private_key(
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data=self.dest_private_key_bytes,
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passphrase=self.dest_passphrase,
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current_hint=self.src_private_key,
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)
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except Exception:
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return True
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return key_format != self.format or not cryptography_compare_private_keys(
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self.dest_private_key, self.src_private_key
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)
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def dump(self) -> dict[str, t.Any]:
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"""Serialize the object into a dictionary."""
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return {}
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def select_backend(module: AnsibleModule) -> PrivateKeyConvertBackend:
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assert_required_cryptography_version(
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module, minimum_cryptography_version=MINIMAL_CRYPTOGRAPHY_VERSION
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)
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return PrivateKeyConvertBackend(module=module)
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def get_privatekey_argument_spec() -> ArgumentSpec:
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return ArgumentSpec(
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argument_spec={
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"src_path": {"type": "path"},
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"src_content": {"type": "str"},
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"src_passphrase": {"type": "str", "no_log": True},
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"dest_passphrase": {"type": "str", "no_log": True},
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"format": {
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"type": "str",
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"required": True,
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"choices": ["pkcs1", "pkcs8", "raw"],
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},
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},
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mutually_exclusive=[
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["src_path", "src_content"],
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],
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required_one_of=[
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["src_path", "src_content"],
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],
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)
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__all__ = (
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"PrivateKeyError",
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"PrivateKeyConvertBackend",
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"select_backend",
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"get_privatekey_argument_spec",
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)
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