mirror of
https://github.com/Yubico/yubioath-flutter.git
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340 lines
11 KiB
Python
340 lines
11 KiB
Python
# Copyright (c) 2021 Yubico AB
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or
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# without modification, are permitted provided that the following
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# conditions are met:
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#
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above
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# copyright notice, this list of conditions and the following
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# disclaimer in the documentation and/or other materials provided
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# with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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# COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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from .base import (
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RpcNode,
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action,
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child,
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ChildResetException,
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TimeoutException,
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RpcException,
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encode_bytes,
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decode_bytes,
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)
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from ykman.settings import AppData
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from yubikit.core import require_version, NotSupportedError
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from yubikit.core.smartcard import ApduError, SW
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from yubikit.oath import OathSession, CredentialData, OATH_TYPE, HASH_ALGORITHM
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from dataclasses import asdict
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from enum import Enum, unique
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from time import time
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import hmac
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import os
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import logging
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logger = logging.getLogger(__name__)
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class AuthRequiredException(RpcException):
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def __init__(self):
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super().__init__("auth-required", "Authentication is required")
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@unique
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class KEYSTORE(str, Enum):
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UNKNOWN = "unknown"
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ALLOWED = "allowed"
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FAILED = "failed"
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# DENIED = "denied" # Maybe failed is enough?
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class OathNode(RpcNode):
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_keystore_state = KEYSTORE.UNKNOWN
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@classmethod
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def _get_keys(cls):
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if not hasattr(cls, "_oath_keys"):
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cls._oath_keys = AppData("oath_keys")
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return cls._oath_keys
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@classmethod
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def _unlock_keystore(cls):
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keys = cls._get_keys()
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state = cls._keystore_state
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if state == KEYSTORE.UNKNOWN:
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try:
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keys.ensure_unlocked()
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cls._keystore_state = KEYSTORE.ALLOWED
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except Exception: # TODO: Use more specific exceptions
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logger.warning("Couldn't read key from Keychain", exc_info=True)
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cls._keystore_state = KEYSTORE.FAILED
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return cls._keystore_state == KEYSTORE.ALLOWED
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def _get_access_key(self, device_id):
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keys = self._get_keys()
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if self.session.device_id in keys and self._unlock_keystore():
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return bytes.fromhex(keys.get_secret(self.session.device_id))
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return None
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def __init__(self, connection):
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super().__init__()
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self.session = OathSession(connection)
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if self.session.locked:
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key = self._get_access_key(self.session.device_id)
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if key:
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try:
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self._do_validate(key)
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except ApduError as e:
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# Wrong key, delete
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if e.sw == SW.INCORRECT_PARAMETERS:
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keys = self._get_keys()
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del keys[self.session.device_id]
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keys.write()
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except Exception:
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logger.warning("Error authenticating", exc_info=True)
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def __call__(self, *args, **kwargs):
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try:
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return super().__call__(*args, **kwargs)
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except ApduError as e:
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if e.sw == SW.SECURITY_CONDITION_NOT_SATISFIED:
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raise AuthRequiredException()
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# TODO: This should probably be in a baseclass of all "AppNodes".
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raise ChildResetException(f"SW: {e.sw:x}")
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def get_data(self):
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keys = self._get_keys()
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return dict(
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version=self.session.version,
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device_id=self.session.device_id,
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has_key=self.session.has_key,
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locked=self.session.locked,
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remembered=self.session.device_id in keys,
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keystore=self._keystore_state,
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)
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@action
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def derive(self, params, event, signal):
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return dict(key=self.session.derive_key(params.pop("password")))
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@action
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def forget(self, params, event, signal):
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keys = self._get_keys()
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del keys[self.session.device_id]
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keys.write()
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return dict()
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def _remember_key(self, key):
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keys = self._get_keys()
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if key is None:
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if self.session.device_id in keys:
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del keys[self.session.device_id]
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keys.write()
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return True
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elif self._unlock_keystore():
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keys.put_secret(self.session.device_id, key.hex())
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keys.write()
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return True
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else:
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return False
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def _get_key(self, params):
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has_key = "key" in params
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has_pw = "password" in params
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if has_key and has_pw:
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raise ValueError("Only one of 'key' and 'password' can be provided.")
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if has_pw:
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return self.session.derive_key(params.pop("password"))
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if has_key:
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return decode_bytes(params.pop("key"))
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raise ValueError("One of 'key' and 'password' must be provided.")
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def _do_validate(self, key):
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self.session.validate(key)
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salt = os.urandom(32)
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digest = hmac.new(salt, key, "sha256").digest()
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self._key_verifier = (salt, digest)
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@action
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def validate(self, params, event, signal):
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remember = params.pop("remember", False)
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key = self._get_key(params)
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if self.session.locked:
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try:
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self._do_validate(key)
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valid = True
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except ApduError as e:
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if e.sw == SW.INCORRECT_PARAMETERS:
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valid = False
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else:
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raise e
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elif hasattr(self, "_key_verifier"):
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salt, digest = self._key_verifier
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verify = hmac.new(salt, key, "sha256").digest()
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valid = hmac.compare_digest(digest, verify)
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else:
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valid = False
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if valid and remember:
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remembered = self._remember_key(key)
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else:
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remembered = False
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return dict(valid=valid, remembered=remembered)
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@action
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def set_key(self, params, event, signal):
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remember = params.pop("remember", False)
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key = self._get_key(params)
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self.session.set_key(key)
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remember &= self._remember_key(key if remember else None)
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return dict(remembered=remember)
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@action(condition=lambda self: self.session.has_key)
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def unset_key(self, params, event, signal):
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self.session.unset_key()
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self._remember_key(None)
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return dict()
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@action
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def reset(self, params, event, signal):
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self.session.reset()
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self._remember_key(None)
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return dict()
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@child(condition=lambda self: not self.session.locked)
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def accounts(self):
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return CredentialsNode(self.session)
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class CredentialsNode(RpcNode):
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def __init__(self, session):
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super().__init__()
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self.session = session
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self.refresh()
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def refresh(self):
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# N.B. We use 'calculate_all' since it tells us if a TOTP credential
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# requires touch or not.
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self._creds = {c.id: c for c in self.session.calculate_all().keys()}
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if self._child and self._child_name not in self._creds:
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self._close_child()
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def list_children(self):
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return {encode_bytes(c_id): asdict(c) for c_id, c in self._creds.items()}
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def create_child(self, name):
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key = decode_bytes(name)
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if key in self._creds:
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return CredentialNode(self.session, self._creds[key], self.refresh)
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return super().create_child(name)
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@action
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def calculate_all(self, params, event, signal):
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timestamp = params.pop("timestamp", None)
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result = self.session.calculate_all(timestamp)
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return dict(
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entries=[
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dict(credential=asdict(cred), code=(asdict(code) if code else None))
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for (cred, code) in result.items()
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]
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)
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@action
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def put(self, params, event, signal):
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require_touch = params.pop("require_touch", False)
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if "uri" in params:
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data = CredentialData.parse_uri(params.pop("uri"))
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if params:
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raise ValueError("Unsupported parameters present")
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else:
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data = CredentialData(
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params.pop("name"),
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OATH_TYPE[params.pop("oath_type").upper()],
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HASH_ALGORITHM[params.pop("hash", "sha1".upper())],
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decode_bytes(params.pop("secret")),
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**params,
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)
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if data.get_id() in self._creds:
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raise ValueError("Credential already exists")
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credential = self.session.put_credential(data, require_touch)
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self._creds[credential.id] = credential
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return asdict(credential)
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class CredentialNode(RpcNode):
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def __init__(self, session, credential, refresh):
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super().__init__()
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self.session = session
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self.credential = credential
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self.refresh = refresh
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def _require_version(self, major, minor, micro):
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try:
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require_version(self.session.version, (major, minor, micro))
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return True
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except NotSupportedError:
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return False
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def get_info(self):
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return asdict(self.credential)
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@action
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def code(self, params, event, signal):
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timestamp = params.pop("timestamp", None)
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try:
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start = time()
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code = self.session.calculate_code(self.credential, timestamp)
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return asdict(code)
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except ApduError as e:
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if e.sw == SW.SECURITY_CONDITION_NOT_SATISFIED and time() - start > 5:
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raise TimeoutException()
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raise
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@action
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def calculate(self, params, event, signal):
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challenge = decode_bytes(params.pop("challenge"))
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try:
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start = time()
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response = self.session.calculate(self.credential.id, challenge)
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return dict(response=response)
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except ApduError as e:
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if e.sw == SW.SECURITY_CONDITION_NOT_SATISFIED and time() - start > 5:
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raise TimeoutException()
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raise
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@action
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def delete(self, params, event, signal):
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self.session.delete_credential(self.credential.id)
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self.refresh()
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self.credential = None
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return dict()
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@action(condition=lambda self: self._require_version(5, 3, 1))
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def rename(self, params, event, signal):
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name = params.pop("name")
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issuer = params.pop("issuer", None)
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try:
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new_id = self.session.rename_credential(self.credential.id, name, issuer)
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self.refresh()
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return dict(credential_id=new_id)
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except ApduError as e:
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if e.sw == SW.INCORRECT_PARAMETERS:
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raise ValueError("Issuer/name too long")
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raise e
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