mirror of https://github.com/nucypher/nucypher.git
Move retrieval machinery to network/retrieval and revocation to policy/revocation
Bogdan Opanchuk
parent
1ad868bf41
commit
a9cc13e825
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@ -20,9 +20,7 @@ import contextlib
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import json
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import time
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from base64 import b64encode
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from collections import OrderedDict, defaultdict, namedtuple
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from datetime import datetime
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from functools import partial
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from json.decoder import JSONDecodeError
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from pathlib import Path
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from queue import Queue
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@ -84,15 +82,12 @@ from nucypher.crypto.powers import (
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TLSHostingPower,
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)
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from nucypher.crypto.signing import InvalidSignature
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from nucypher.crypto.splitters import key_splitter, signature_splitter, cfrag_splitter
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from nucypher.crypto.splitters import key_splitter, signature_splitter
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from nucypher.crypto.umbral_adapter import (
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Capsule,
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PublicKey,
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VerificationError,
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reencrypt,
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KeyFrag,
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VerifiedKeyFrag,
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Signature
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)
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from nucypher.datastore.datastore import DatastoreTransactionError, RecordNotFound
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from nucypher.datastore.queries import find_expired_policies, find_expired_treasure_maps
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@ -101,18 +96,12 @@ from nucypher.network.exceptions import NodeSeemsToBeDown
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from nucypher.network.middleware import RestMiddleware
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from nucypher.network.nodes import NodeSprout, TEACHER_NODES, Teacher
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from nucypher.network.protocols import InterfaceInfo, parse_node_uri
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from nucypher.network.retrieval import RetrievalClient, ReencryptionResponse
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from nucypher.network.server import ProxyRESTServer, make_rest_app
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from nucypher.network.trackers import AvailabilityTracker
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from nucypher.policy.hrac import HRAC
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from nucypher.policy.kits import MessageKit, PolicyMessageKit, RetrievalKit
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from nucypher.policy.kits import MessageKit, PolicyMessageKit
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from nucypher.policy.maps import TreasureMap, EncryptedTreasureMap, AuthorizedKeyFrag
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from nucypher.policy.orders import (
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RetrievalWorkOrder,
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ReencryptionRequest,
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ReencryptionResponse,
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RetrievalPlan,
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RetrievalResult,
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)
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from nucypher.policy.policies import Policy
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from nucypher.utilities.logging import Logger
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from nucypher.utilities.networking import validate_worker_ip
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@ -745,144 +734,6 @@ class Bob(Character):
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return controller
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class RetrievalClient:
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"""
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Capsule frag retrieval machinery shared between Bob and Porter.
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"""
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def __init__(self, learner: Learner):
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self._learner = learner
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self.log = Logger(self.__class__.__name__)
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def _request_reencryption(self,
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ursula: 'Ursula',
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reencryption_request: 'ReencryptionRequest',
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delegating_key: PublicKey,
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receiving_key: PublicKey,
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) -> Dict['Capsule', 'VerifiedCapsuleFrag']:
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"""
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Sends a reencryption request to a single Ursula and processes the results.
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Returns reencrypted capsule frags matched to corresponding capsules.
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"""
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middleware = self._learner.network_middleware
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try:
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response = middleware.reencrypt(ursula, bytes(reencryption_request))
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except NodeSeemsToBeDown as e:
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# TODO: What to do here? Ursula isn't supposed to be down. NRN
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message = (f"Ursula ({ursula}) seems to be down "
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f"while trying to complete ReencryptionRequest: {reencryption_request}")
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self.log.info(message)
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raise RuntimeError(message) from e
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except middleware.NotFound as e:
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# This Ursula claims not to have a matching KFrag. Maybe this has been revoked?
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# TODO: What's the thing to do here?
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# Do we want to track these Ursulas in some way in case they're lying? #567
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message = (f"Ursula ({ursula}) claims not to have the KFrag "
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f"to complete ReencryptionRequest: {reencryption_request}. "
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f"Has access been revoked?")
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self.log.warn(message)
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raise RuntimeError(message) from e
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except middleware.UnexpectedResponse:
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raise # TODO: Handle this
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try:
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reencryption_response = ReencryptionResponse.from_bytes(response.content)
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except Exception as e:
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message = f"Ursula ({ursula}) returned an invalid response: {e}."
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self.log.warn(message)
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raise RuntimeError(message)
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if len(reencryption_request.capsules) != len(reencryption_response.cfrags):
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message = (f"Ursula ({ursula}) gave back the wrong number of cfrags. "
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"She's up to something.")
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self.log.warn(message)
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raise RuntimeError(message)
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ursula_verifying_key = ursula.stamp.as_umbral_pubkey()
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capsules_bytes = b''.join(bytes(capsule) for capsule in reencryption_request.capsules)
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cfrags_bytes = b''.join(bytes(cfrag) for cfrag in reencryption_response.cfrags)
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# Validate re-encryption signature
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if not reencryption_response.signature.verify(ursula_verifying_key, capsules_bytes + cfrags_bytes):
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message = (f"{reencryption_request.capsules} and {reencryption_response.cfrags} "
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"are not properly signed by Ursula.")
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self.log.warn(message)
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# TODO: Instead of raising, we should do something (#957)
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raise InvalidSignature(message)
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verified_cfrags = {}
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for capsule, cfrag in zip(reencryption_request.capsules, reencryption_response.cfrags):
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# TODO: should we allow partially valid responses?
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# Verify cfrags
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try:
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verified_cfrag = cfrag.verify(capsule,
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verifying_pk=reencryption_request._alice_verifying_key,
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delegating_pk=delegating_key,
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receiving_pk=receiving_key)
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except VerificationError:
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# In future we may want to remember this Ursula and do something about it
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raise
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verified_cfrags[capsule] = verified_cfrag
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return verified_cfrags
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def retrieve_cfrags(
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self,
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treasure_map: TreasureMap,
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retrieval_kits: Sequence[RetrievalKit],
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alice_verifying_key: PublicKey, # KeyFrag signer's key
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bob_encrypting_key: PublicKey, # User's public key (reencryption target)
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bob_verifying_key: PublicKey,
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policy_encrypting_key: PublicKey, # Key used to create the policy
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) -> List[RetrievalResult]:
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# TODO: why is it here? This code shouldn't know about these details.
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# OK, so we're going to need to do some network activity for this retrieval.
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# Let's make sure we've seeded.
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if not self._learner.done_seeding:
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self._learner.learn_from_teacher_node()
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retrieval_plan = RetrievalPlan(treasure_map=treasure_map, retrieval_kits=retrieval_kits)
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while not retrieval_plan.is_complete():
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# TODO (#2789): Currently we'll only query one Ursula once during the retrieval.
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# Alternatively we may re-query Ursulas that were offline until the timeout expires.
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work_order = retrieval_plan.get_work_order()
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if work_order.ursula_address not in self._learner.known_nodes:
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continue
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ursula = self._learner.known_nodes[work_order.ursula_address]
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reencryption_request = ReencryptionRequest.from_work_order(
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work_order=work_order,
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treasure_map=treasure_map,
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alice_verifying_key=alice_verifying_key,
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bob_verifying_key=bob_verifying_key)
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try:
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cfrags = self._request_reencryption(ursula=ursula,
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reencryption_request=reencryption_request,
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delegating_key=policy_encrypting_key,
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receiving_key=bob_encrypting_key)
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except Exception as e:
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# TODO (#2789): at this point we can separate the exceptions to "acceptable"
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# (Ursula is not reachable) and "unacceptable" (Ursula provided bad results).
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self.log.warn(f"Ursula {ursula} failed to reencrypt: {e}")
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continue
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retrieval_plan.update(work_order, cfrags)
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return retrieval_plan.results()
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class Ursula(Teacher, Character, Worker):
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banner = URSULA_BANNER
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@ -15,24 +15,20 @@ You should have received a copy of the GNU Affero General Public License
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along with nucypher. If not, see <https://www.gnu.org/licenses/>.
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"""
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from collections import OrderedDict, defaultdict
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from collections import defaultdict
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import random
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from typing import Optional, Dict, Sequence, Union, List, Set
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from typing import Dict, Sequence, List
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import maya
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from bytestring_splitter import BytestringSplitter, VariableLengthBytestring
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from constant_sorrow.constants import CFRAG_NOT_RETAINED
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from eth_typing.evm import ChecksumAddress
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from eth_utils.address import to_canonical_address, to_checksum_address
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from twisted.logger import Logger
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from nucypher.crypto.signing import SignatureStamp, InvalidSignature
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from nucypher.crypto.splitters import (
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key_splitter,
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capsule_splitter,
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cfrag_splitter,
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key_splitter,
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signature_splitter,
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kfrag_splitter
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)
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from nucypher.crypto.umbral_adapter import (
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Capsule,
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@ -40,10 +36,13 @@ from nucypher.crypto.umbral_adapter import (
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PublicKey,
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Signature,
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VerifiedCapsuleFrag,
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VerificationError,
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)
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from nucypher.network.exceptions import NodeSeemsToBeDown
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from nucypher.network.nodes import Learner
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from nucypher.policy.hrac import HRAC, hrac_splitter
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from nucypher.policy.kits import MessageKit
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from nucypher.policy.maps import AuthorizedKeyFrag, TreasureMap
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from nucypher.policy.kits import MessageKit, RetrievalKit, RetrievalResult
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from nucypher.policy.maps import TreasureMap
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class RetrievalPlan:
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@ -52,7 +51,7 @@ class RetrievalPlan:
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during retrieval.
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"""
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def __init__(self, treasure_map: TreasureMap, retrieval_kits: Sequence['RetrievalKit']):
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def __init__(self, treasure_map: TreasureMap, retrieval_kits: Sequence[RetrievalKit]):
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# Record the retrieval kits order
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self._capsules = [retrieval_kit.capsule for retrieval_kit in retrieval_kits]
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@ -129,36 +128,6 @@ class RetrievalPlan:
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return [RetrievalResult(self._results[capsule]) for capsule in self._capsules]
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class RetrievalResult:
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"""
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An object representing retrieval results for a single capsule.
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"""
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@classmethod
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def empty(cls):
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return cls({})
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def __init__(self, cfrags: Dict[ChecksumAddress, VerifiedCapsuleFrag]):
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self.cfrags = cfrags
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def addresses(self) -> Set[ChecksumAddress]:
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return set(self.cfrags)
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def with_result(self, result: 'RetrievalResult') -> 'RetrievalResult':
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"""
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Joins two RetrievalResult objects.
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If both objects contain cfrags from the same Ursula,
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the one from `result` will be kept.
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"""
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# TODO: would `+` or `|` operator be more suitable here?
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# TODO: check for overlap?
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new_cfrags = dict(self.cfrags)
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new_cfrags.update(result.cfrags)
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return RetrievalResult(cfrags=new_cfrags)
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class RetrievalWorkOrder:
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"""
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A work order issued by a retrieval plan to request reencryption from an Ursula
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@ -273,69 +242,139 @@ class ReencryptionResponse:
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return bytes(self.signature) + b''.join(bytes(cfrag) for cfrag in self.cfrags)
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class Revocation:
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class RetrievalClient:
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"""
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Represents a string used by characters to perform a revocation on a specific
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Ursula. It's a bytestring made of the following format:
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REVOKE-<arrangement id to revoke><signature of the previous string>
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This is sent as a payload in a DELETE method to the /KFrag/ endpoint.
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Capsule frag retrieval machinery shared between Bob and Porter.
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"""
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PREFIX = b'REVOKE-'
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revocation_splitter = BytestringSplitter(
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(bytes, len(PREFIX)),
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(bytes, 20), # ursula canonical address
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(bytes, AuthorizedKeyFrag.ENCRYPTED_SIZE), # encrypted kfrag payload (includes writ)
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signature_splitter
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)
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def __init__(self, learner: Learner):
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self._learner = learner
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self.log = Logger(self.__class__.__name__)
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def __init__(self,
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ursula_checksum_address: ChecksumAddress, # TODO: Use staker address instead (what if the staker rebonds)?
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encrypted_kfrag: bytes,
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signer: 'SignatureStamp' = None,
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signature: Signature = None):
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self.ursula_checksum_address = ursula_checksum_address
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self.encrypted_kfrag = encrypted_kfrag
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if not (bool(signer) ^ bool(signature)):
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raise ValueError("Either pass a signer or a signature; not both.")
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elif signer:
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self.signature = signer(self.payload)
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elif signature:
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self.signature = signature
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def __bytes__(self):
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return self.payload + bytes(self.signature)
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def __repr__(self):
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return bytes(self)
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def __len__(self):
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return len(bytes(self))
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def __eq__(self, other):
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return bytes(self) == bytes(other)
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@property
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def payload(self):
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return self.PREFIX \
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+ to_canonical_address(self.ursula_checksum_address) \
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+ bytes(self.encrypted_kfrag) \
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@classmethod
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def from_bytes(cls, revocation_bytes):
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prefix, ursula_canonical_address, ekfrag, signature = cls.revocation_splitter(revocation_bytes)
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ursula_checksum_address = to_checksum_address(ursula_canonical_address)
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return cls(ursula_checksum_address=ursula_checksum_address,
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encrypted_kfrag=ekfrag,
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signature=signature)
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def verify_signature(self, alice_verifying_key: 'PublicKey') -> bool:
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def _request_reencryption(self,
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ursula: 'Ursula',
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reencryption_request: 'ReencryptionRequest',
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delegating_key: PublicKey,
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receiving_key: PublicKey,
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) -> Dict['Capsule', 'VerifiedCapsuleFrag']:
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"""
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Verifies the revocation was from the provided pubkey.
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Sends a reencryption request to a single Ursula and processes the results.
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Returns reencrypted capsule frags matched to corresponding capsules.
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"""
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if not self.signature.verify(self.payload, alice_verifying_key):
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raise InvalidSignature(f"Revocation has an invalid signature: {self.signature}")
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return True
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middleware = self._learner.network_middleware
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try:
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response = middleware.reencrypt(ursula, bytes(reencryption_request))
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except NodeSeemsToBeDown as e:
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# TODO: What to do here? Ursula isn't supposed to be down. NRN
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message = (f"Ursula ({ursula}) seems to be down "
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f"while trying to complete ReencryptionRequest: {reencryption_request}")
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self.log.info(message)
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raise RuntimeError(message) from e
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except middleware.NotFound as e:
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# This Ursula claims not to have a matching KFrag. Maybe this has been revoked?
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# TODO: What's the thing to do here?
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# Do we want to track these Ursulas in some way in case they're lying? #567
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message = (f"Ursula ({ursula}) claims not to have the KFrag "
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f"to complete ReencryptionRequest: {reencryption_request}. "
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f"Has access been revoked?")
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self.log.warn(message)
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raise RuntimeError(message) from e
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except middleware.UnexpectedResponse:
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raise # TODO: Handle this
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try:
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reencryption_response = ReencryptionResponse.from_bytes(response.content)
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except Exception as e:
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message = f"Ursula ({ursula}) returned an invalid response: {e}."
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self.log.warn(message)
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raise RuntimeError(message)
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if len(reencryption_request.capsules) != len(reencryption_response.cfrags):
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message = (f"Ursula ({ursula}) gave back the wrong number of cfrags. "
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"She's up to something.")
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self.log.warn(message)
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raise RuntimeError(message)
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ursula_verifying_key = ursula.stamp.as_umbral_pubkey()
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capsules_bytes = b''.join(bytes(capsule) for capsule in reencryption_request.capsules)
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cfrags_bytes = b''.join(bytes(cfrag) for cfrag in reencryption_response.cfrags)
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# Validate re-encryption signature
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if not reencryption_response.signature.verify(ursula_verifying_key, capsules_bytes + cfrags_bytes):
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message = (f"{reencryption_request.capsules} and {reencryption_response.cfrags} "
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"are not properly signed by Ursula.")
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self.log.warn(message)
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# TODO: Instead of raising, we should do something (#957)
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raise InvalidSignature(message)
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verified_cfrags = {}
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for capsule, cfrag in zip(reencryption_request.capsules, reencryption_response.cfrags):
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# TODO: should we allow partially valid responses?
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# Verify cfrags
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try:
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verified_cfrag = cfrag.verify(capsule,
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verifying_pk=reencryption_request._alice_verifying_key,
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delegating_pk=delegating_key,
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receiving_pk=receiving_key)
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except VerificationError:
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# In future we may want to remember this Ursula and do something about it
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raise
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verified_cfrags[capsule] = verified_cfrag
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return verified_cfrags
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def retrieve_cfrags(
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self,
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treasure_map: TreasureMap,
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retrieval_kits: Sequence[RetrievalKit],
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alice_verifying_key: PublicKey, # KeyFrag signer's key
|
||||
bob_encrypting_key: PublicKey, # User's public key (reencryption target)
|
||||
bob_verifying_key: PublicKey,
|
||||
policy_encrypting_key: PublicKey, # Key used to create the policy
|
||||
) -> List[RetrievalResult]:
|
||||
|
||||
# TODO: why is it here? This code shouldn't know about these details.
|
||||
# OK, so we're going to need to do some network activity for this retrieval.
|
||||
# Let's make sure we've seeded.
|
||||
if not self._learner.done_seeding:
|
||||
self._learner.learn_from_teacher_node()
|
||||
|
||||
retrieval_plan = RetrievalPlan(treasure_map=treasure_map, retrieval_kits=retrieval_kits)
|
||||
|
||||
while not retrieval_plan.is_complete():
|
||||
# TODO (#2789): Currently we'll only query one Ursula once during the retrieval.
|
||||
# Alternatively we may re-query Ursulas that were offline until the timeout expires.
|
||||
|
||||
work_order = retrieval_plan.get_work_order()
|
||||
|
||||
if work_order.ursula_address not in self._learner.known_nodes:
|
||||
continue
|
||||
|
||||
ursula = self._learner.known_nodes[work_order.ursula_address]
|
||||
reencryption_request = ReencryptionRequest.from_work_order(
|
||||
work_order=work_order,
|
||||
treasure_map=treasure_map,
|
||||
alice_verifying_key=alice_verifying_key,
|
||||
bob_verifying_key=bob_verifying_key)
|
||||
|
||||
try:
|
||||
cfrags = self._request_reencryption(ursula=ursula,
|
||||
reencryption_request=reencryption_request,
|
||||
delegating_key=policy_encrypting_key,
|
||||
receiving_key=bob_encrypting_key)
|
||||
except Exception as e:
|
||||
# TODO (#2789): at this point we can separate the exceptions to "acceptable"
|
||||
# (Ursula is not reachable) and "unacceptable" (Ursula provided bad results).
|
||||
self.log.warn(f"Ursula {ursula} failed to reencrypt: {e}")
|
||||
continue
|
||||
|
||||
retrieval_plan.update(work_order, cfrags)
|
||||
|
||||
return retrieval_plan.results()
|
||||
|
|
@ -34,12 +34,13 @@ from nucypher.crypto.powers import KeyPairBasedPower, PowerUpError
|
|||
from nucypher.crypto.signing import InvalidSignature
|
||||
from nucypher.datastore.datastore import Datastore
|
||||
from nucypher.datastore.models import ReencryptionRequest as ReencryptionRequestModel
|
||||
from nucypher.policy.orders import ReencryptionRequest, ReencryptionResponse
|
||||
from nucypher.network import LEARNING_LOOP_VERSION
|
||||
from nucypher.network.exceptions import NodeSeemsToBeDown
|
||||
from nucypher.network.protocols import InterfaceInfo
|
||||
from nucypher.network.retrieval import ReencryptionRequest, ReencryptionResponse
|
||||
from nucypher.policy.hrac import HRAC
|
||||
from nucypher.policy.kits import MessageKit
|
||||
from nucypher.policy.revocation import Revocation
|
||||
from nucypher.utilities.logging import Logger
|
||||
|
||||
HERE = BASE_DIR = Path(__file__).parent
|
||||
|
|
@ -271,7 +272,6 @@ def _make_rest_app(datastore: Datastore, this_node, domain: str, log: Logger) ->
|
|||
|
||||
@rest_app.route('/revoke', methods=['POST'])
|
||||
def revoke():
|
||||
from nucypher.policy.orders import Revocation
|
||||
revocation = Revocation.from_bytes(request.data)
|
||||
# TODO: Implement offchain revocation.
|
||||
return Response(status=200)
|
||||
|
|
|
|||
|
|
@ -16,12 +16,11 @@ along with nucypher. If not, see <https://www.gnu.org/licenses/>.
|
|||
"""
|
||||
|
||||
|
||||
from typing import Dict, NamedTuple, Optional, Tuple, List, Iterable
|
||||
from typing import Dict, Optional, Iterable, Set
|
||||
|
||||
from bytestring_splitter import BytestringSplitter, BytestringKwargifier, VariableLengthBytestring
|
||||
from bytestring_splitter import BytestringSplitter, VariableLengthBytestring
|
||||
from constant_sorrow.constants import (
|
||||
NOT_SIGNED,
|
||||
UNKNOWN_SENDER,
|
||||
DO_NOT_SIGN,
|
||||
SIGNATURE_TO_FOLLOW,
|
||||
SIGNATURE_IS_ON_CIPHERTEXT,
|
||||
|
|
@ -30,7 +29,12 @@ from constant_sorrow.constants import (
|
|||
from eth_typing import ChecksumAddress
|
||||
from eth_utils import to_checksum_address, to_canonical_address
|
||||
|
||||
from nucypher.crypto.splitters import capsule_splitter, key_splitter, signature_splitter, checksum_address_splitter
|
||||
from nucypher.crypto.splitters import (
|
||||
capsule_splitter,
|
||||
key_splitter,
|
||||
signature_splitter,
|
||||
checksum_address_splitter,
|
||||
)
|
||||
import nucypher.crypto.umbral_adapter as umbral # need it to mock `umbral.encrypt`
|
||||
from nucypher.crypto.umbral_adapter import PublicKey, VerifiedCapsuleFrag, Capsule, Signature
|
||||
|
||||
|
|
@ -171,8 +175,6 @@ class PolicyMessageKit:
|
|||
policy_key: PublicKey,
|
||||
threshold: int
|
||||
) -> 'PolicyMessageKit':
|
||||
# TODO: can we get rid of circular dependency?
|
||||
from nucypher.policy.orders import RetrievalResult
|
||||
return cls(policy_key, threshold, RetrievalResult.empty(), message_kit)
|
||||
|
||||
def as_retrieval_kit(self) -> RetrievalKit:
|
||||
|
|
@ -216,39 +218,32 @@ class PolicyMessageKit:
|
|||
message_kit=self.message_kit)
|
||||
|
||||
|
||||
class RevocationKit:
|
||||
|
||||
def __init__(self, treasure_map, signer: 'SignatureStamp'):
|
||||
from nucypher.policy.orders import Revocation
|
||||
self.revocations = dict()
|
||||
for node_id, encrypted_kfrag in treasure_map:
|
||||
self.revocations[node_id] = Revocation(ursula_checksum_address=node_id,
|
||||
encrypted_kfrag=encrypted_kfrag,
|
||||
signer=signer)
|
||||
|
||||
def __iter__(self):
|
||||
return iter(self.revocations.values())
|
||||
|
||||
def __getitem__(self, node_id):
|
||||
return self.revocations[node_id]
|
||||
|
||||
def __len__(self):
|
||||
return len(self.revocations)
|
||||
|
||||
def __eq__(self, other):
|
||||
return self.revocations == other.revocations
|
||||
|
||||
@property
|
||||
def revokable_addresses(self):
|
||||
# TODO: a better name?
|
||||
class RetrievalResult:
|
||||
"""
|
||||
Returns a Set of revokable addresses in the checksum address formatting
|
||||
An object representing retrieval results for a single capsule.
|
||||
"""
|
||||
return set(self.revocations.keys())
|
||||
|
||||
def add_confirmation(self, node_id, signed_receipt):
|
||||
@classmethod
|
||||
def empty(cls):
|
||||
return cls({})
|
||||
|
||||
def __init__(self, cfrags: Dict[ChecksumAddress, VerifiedCapsuleFrag]):
|
||||
self.cfrags = cfrags
|
||||
|
||||
def addresses(self) -> Set[ChecksumAddress]:
|
||||
return set(self.cfrags)
|
||||
|
||||
def with_result(self, result: 'RetrievalResult') -> 'RetrievalResult':
|
||||
"""
|
||||
Adds a signed confirmation of Ursula's ability to revoke the arrangement.
|
||||
Joins two RetrievalResult objects.
|
||||
|
||||
If both objects contain cfrags from the same Ursula,
|
||||
the one from `result` will be kept.
|
||||
"""
|
||||
# TODO: Verify Ursula's signature
|
||||
# TODO: Implement receipts
|
||||
raise NotImplementedError
|
||||
# TODO: would `+` or `|` operator be more suitable here?
|
||||
|
||||
# TODO: check for overlap?
|
||||
new_cfrags = dict(self.cfrags)
|
||||
new_cfrags.update(result.cfrags)
|
||||
return RetrievalResult(cfrags=new_cfrags)
|
||||
|
|
|
|||
|
|
@ -28,7 +28,6 @@ from nucypher.crypto.splitters import key_splitter
|
|||
from nucypher.crypto.umbral_adapter import PublicKey, VerifiedKeyFrag, Signature
|
||||
from nucypher.network.middleware import RestMiddleware
|
||||
from nucypher.policy.hrac import HRAC
|
||||
from nucypher.policy.kits import RevocationKit
|
||||
from nucypher.policy.maps import TreasureMap
|
||||
from nucypher.policy.reservoir import (
|
||||
make_federated_staker_reservoir,
|
||||
|
|
@ -36,6 +35,7 @@ from nucypher.policy.reservoir import (
|
|||
PrefetchStrategy,
|
||||
make_decentralized_staker_reservoir
|
||||
)
|
||||
from nucypher.policy.revocation import RevocationKit
|
||||
from nucypher.utilities.concurrency import WorkerPool
|
||||
from nucypher.utilities.logging import Logger
|
||||
|
||||
|
|
|
|||
|
|
@ -0,0 +1,133 @@
|
|||
"""
|
||||
This file is part of nucypher.
|
||||
|
||||
nucypher is free software: you can redistribute it and/or modify
|
||||
it under the terms of the GNU Affero General Public License as published by
|
||||
the Free Software Foundation, either version 3 of the License, or
|
||||
(at your option) any later version.
|
||||
|
||||
nucypher is distributed in the hope that it will be useful,
|
||||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
GNU Affero General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU Affero General Public License
|
||||
along with nucypher. If not, see <https://www.gnu.org/licenses/>.
|
||||
"""
|
||||
|
||||
|
||||
from typing import Optional
|
||||
|
||||
from bytestring_splitter import BytestringSplitter
|
||||
from eth_typing.evm import ChecksumAddress
|
||||
from eth_utils.address import to_canonical_address, to_checksum_address
|
||||
|
||||
from nucypher.crypto.signing import SignatureStamp, InvalidSignature
|
||||
from nucypher.crypto.splitters import signature_splitter, checksum_address_splitter
|
||||
from nucypher.crypto.umbral_adapter import Signature, PublicKey
|
||||
from nucypher.policy.kits import MessageKit
|
||||
from nucypher.policy.maps import AuthorizedKeyFrag
|
||||
|
||||
|
||||
class Revocation:
|
||||
"""
|
||||
Represents a string used by characters to perform a revocation on a specific
|
||||
Ursula. It's a bytestring made of the following format:
|
||||
REVOKE-<arrangement id to revoke><signature of the previous string>
|
||||
This is sent as a payload in a DELETE method to the /KFrag/ endpoint.
|
||||
"""
|
||||
|
||||
PREFIX = b'REVOKE-'
|
||||
revocation_splitter = BytestringSplitter(
|
||||
(bytes, len(PREFIX)),
|
||||
checksum_address_splitter, # ursula canonical address
|
||||
(bytes, AuthorizedKeyFrag.ENCRYPTED_SIZE), # encrypted kfrag payload (includes writ)
|
||||
signature_splitter
|
||||
)
|
||||
|
||||
def __init__(self,
|
||||
ursula_checksum_address: ChecksumAddress, # TODO: Use staker address instead (what if the staker rebonds)?
|
||||
encrypted_kfrag: MessageKit,
|
||||
signer: Optional[SignatureStamp] = None,
|
||||
signature: Optional[Signature] = None):
|
||||
|
||||
self.ursula_checksum_address = ursula_checksum_address
|
||||
self.encrypted_kfrag = encrypted_kfrag
|
||||
|
||||
if not (bool(signer) ^ bool(signature)):
|
||||
raise ValueError("Either pass a signer or a signature; not both.")
|
||||
elif signer:
|
||||
self.signature = signer(self.payload)
|
||||
elif signature:
|
||||
self.signature = signature
|
||||
|
||||
def __bytes__(self):
|
||||
return self.payload + bytes(self.signature)
|
||||
|
||||
def __repr__(self):
|
||||
return bytes(self)
|
||||
|
||||
def __len__(self):
|
||||
return len(bytes(self))
|
||||
|
||||
def __eq__(self, other):
|
||||
return bytes(self) == bytes(other)
|
||||
|
||||
@property
|
||||
def payload(self):
|
||||
return self.PREFIX \
|
||||
+ to_canonical_address(self.ursula_checksum_address) \
|
||||
+ bytes(self.encrypted_kfrag) \
|
||||
|
||||
@classmethod
|
||||
def from_bytes(cls, revocation_bytes):
|
||||
prefix, ursula_canonical_address, ekfrag, signature = cls.revocation_splitter(revocation_bytes)
|
||||
ursula_checksum_address = to_checksum_address(ursula_canonical_address)
|
||||
return cls(ursula_checksum_address=ursula_checksum_address,
|
||||
encrypted_kfrag=ekfrag,
|
||||
signature=signature)
|
||||
|
||||
def verify_signature(self, alice_verifying_key: PublicKey) -> bool:
|
||||
"""
|
||||
Verifies the revocation was from the provided pubkey.
|
||||
"""
|
||||
if not self.signature.verify(self.payload, alice_verifying_key):
|
||||
raise InvalidSignature(f"Revocation has an invalid signature: {self.signature}")
|
||||
return True
|
||||
|
||||
|
||||
class RevocationKit:
|
||||
|
||||
def __init__(self, treasure_map, signer: SignatureStamp):
|
||||
self.revocations = dict()
|
||||
for node_id, encrypted_kfrag in treasure_map:
|
||||
self.revocations[node_id] = Revocation(ursula_checksum_address=node_id,
|
||||
encrypted_kfrag=encrypted_kfrag,
|
||||
signer=signer)
|
||||
|
||||
def __iter__(self):
|
||||
return iter(self.revocations.values())
|
||||
|
||||
def __getitem__(self, node_id):
|
||||
return self.revocations[node_id]
|
||||
|
||||
def __len__(self):
|
||||
return len(self.revocations)
|
||||
|
||||
def __eq__(self, other):
|
||||
return self.revocations == other.revocations
|
||||
|
||||
@property
|
||||
def revokable_addresses(self):
|
||||
"""
|
||||
Returns a Set of revokable addresses in the checksum address formatting
|
||||
"""
|
||||
return set(self.revocations.keys())
|
||||
|
||||
def add_confirmation(self, node_id, signed_receipt):
|
||||
"""
|
||||
Adds a signed confirmation of Ursula's ability to revoke the arrangement.
|
||||
"""
|
||||
# TODO: Verify Ursula's signature
|
||||
# TODO: Implement receipts
|
||||
raise NotImplementedError
|
||||
|
|
@ -24,7 +24,7 @@ import pytest
|
|||
from nucypher.characters.lawful import Enrico
|
||||
from nucypher.crypto.utils import keccak_digest
|
||||
from nucypher.policy.kits import MessageKit
|
||||
from nucypher.policy.orders import Revocation
|
||||
from nucypher.policy.revocation import Revocation
|
||||
|
||||
|
||||
def test_federated_grant(federated_alice, federated_bob, federated_ursulas):
|
||||
|
|
|
|||
Loading…
Reference in New Issue