731 lines
26 KiB
Python
731 lines
26 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014-2016 OpenMarket Ltd
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# Copyright 2017, 2018 New Vector Ltd.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import logging
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from collections import namedtuple
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from six import raise_from
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from six.moves import urllib
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from signedjson.key import (
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decode_verify_key_bytes,
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encode_verify_key_base64,
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is_signing_algorithm_supported,
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)
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from signedjson.sign import (
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SignatureVerifyException,
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encode_canonical_json,
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sign_json,
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signature_ids,
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verify_signed_json,
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)
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from unpaddedbase64 import decode_base64
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from twisted.internet import defer
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from synapse.api.errors import (
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Codes,
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HttpResponseException,
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RequestSendFailed,
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SynapseError,
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)
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from synapse.util import logcontext, unwrapFirstError
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from synapse.util.logcontext import (
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LoggingContext,
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PreserveLoggingContext,
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preserve_fn,
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run_in_background,
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)
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from synapse.util.metrics import Measure
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from synapse.util.retryutils import NotRetryingDestination
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logger = logging.getLogger(__name__)
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VerifyKeyRequest = namedtuple("VerifyRequest", (
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"server_name", "key_ids", "json_object", "deferred"
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))
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"""
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A request for a verify key to verify a JSON object.
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Attributes:
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server_name(str): The name of the server to verify against.
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key_ids(set(str)): The set of key_ids to that could be used to verify the
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JSON object
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json_object(dict): The JSON object to verify.
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deferred(Deferred[str, str, nacl.signing.VerifyKey]):
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A deferred (server_name, key_id, verify_key) tuple that resolves when
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a verify key has been fetched. The deferreds' callbacks are run with no
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logcontext.
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"""
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class KeyLookupError(ValueError):
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pass
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class Keyring(object):
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def __init__(self, hs):
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self.store = hs.get_datastore()
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self.clock = hs.get_clock()
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self.client = hs.get_http_client()
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self.config = hs.get_config()
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self.perspective_servers = self.config.perspectives
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self.hs = hs
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# map from server name to Deferred. Has an entry for each server with
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# an ongoing key download; the Deferred completes once the download
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# completes.
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#
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# These are regular, logcontext-agnostic Deferreds.
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self.key_downloads = {}
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def verify_json_for_server(self, server_name, json_object):
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return logcontext.make_deferred_yieldable(
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self.verify_json_objects_for_server(
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[(server_name, json_object)]
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)[0]
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)
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def verify_json_objects_for_server(self, server_and_json):
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"""Bulk verifies signatures of json objects, bulk fetching keys as
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necessary.
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Args:
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server_and_json (list): List of pairs of (server_name, json_object)
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Returns:
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List<Deferred>: for each input pair, a deferred indicating success
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or failure to verify each json object's signature for the given
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server_name. The deferreds run their callbacks in the sentinel
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logcontext.
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"""
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verify_requests = []
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for server_name, json_object in server_and_json:
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key_ids = signature_ids(json_object, server_name)
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if not key_ids:
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logger.warn("Request from %s: no supported signature keys",
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server_name)
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deferred = defer.fail(SynapseError(
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400,
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"Not signed with a supported algorithm",
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Codes.UNAUTHORIZED,
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))
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else:
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deferred = defer.Deferred()
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logger.debug("Verifying for %s with key_ids %s",
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server_name, key_ids)
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verify_request = VerifyKeyRequest(
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server_name, key_ids, json_object, deferred
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)
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verify_requests.append(verify_request)
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run_in_background(self._start_key_lookups, verify_requests)
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# Pass those keys to handle_key_deferred so that the json object
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# signatures can be verified
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handle = preserve_fn(_handle_key_deferred)
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return [
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handle(rq) for rq in verify_requests
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]
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@defer.inlineCallbacks
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def _start_key_lookups(self, verify_requests):
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"""Sets off the key fetches for each verify request
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Once each fetch completes, verify_request.deferred will be resolved.
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Args:
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verify_requests (List[VerifyKeyRequest]):
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"""
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try:
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# create a deferred for each server we're going to look up the keys
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# for; we'll resolve them once we have completed our lookups.
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# These will be passed into wait_for_previous_lookups to block
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# any other lookups until we have finished.
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# The deferreds are called with no logcontext.
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server_to_deferred = {
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rq.server_name: defer.Deferred()
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for rq in verify_requests
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}
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# We want to wait for any previous lookups to complete before
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# proceeding.
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yield self.wait_for_previous_lookups(
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[rq.server_name for rq in verify_requests],
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server_to_deferred,
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)
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# Actually start fetching keys.
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self._get_server_verify_keys(verify_requests)
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# When we've finished fetching all the keys for a given server_name,
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# resolve the deferred passed to `wait_for_previous_lookups` so that
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# any lookups waiting will proceed.
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#
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# map from server name to a set of request ids
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server_to_request_ids = {}
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for verify_request in verify_requests:
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server_name = verify_request.server_name
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request_id = id(verify_request)
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server_to_request_ids.setdefault(server_name, set()).add(request_id)
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def remove_deferreds(res, verify_request):
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server_name = verify_request.server_name
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request_id = id(verify_request)
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server_to_request_ids[server_name].discard(request_id)
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if not server_to_request_ids[server_name]:
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d = server_to_deferred.pop(server_name, None)
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if d:
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d.callback(None)
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return res
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for verify_request in verify_requests:
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verify_request.deferred.addBoth(
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remove_deferreds, verify_request,
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)
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except Exception:
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logger.exception("Error starting key lookups")
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@defer.inlineCallbacks
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def wait_for_previous_lookups(self, server_names, server_to_deferred):
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"""Waits for any previous key lookups for the given servers to finish.
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Args:
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server_names (list): list of server_names we want to lookup
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server_to_deferred (dict): server_name to deferred which gets
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resolved once we've finished looking up keys for that server.
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The Deferreds should be regular twisted ones which call their
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callbacks with no logcontext.
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Returns: a Deferred which resolves once all key lookups for the given
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servers have completed. Follows the synapse rules of logcontext
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preservation.
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"""
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loop_count = 1
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while True:
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wait_on = [
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(server_name, self.key_downloads[server_name])
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for server_name in server_names
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if server_name in self.key_downloads
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]
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if not wait_on:
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break
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logger.info(
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"Waiting for existing lookups for %s to complete [loop %i]",
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[w[0] for w in wait_on], loop_count,
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)
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with PreserveLoggingContext():
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yield defer.DeferredList((w[1] for w in wait_on))
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loop_count += 1
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ctx = LoggingContext.current_context()
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def rm(r, server_name_):
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with PreserveLoggingContext(ctx):
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logger.debug("Releasing key lookup lock on %s", server_name_)
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self.key_downloads.pop(server_name_, None)
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return r
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for server_name, deferred in server_to_deferred.items():
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logger.debug("Got key lookup lock on %s", server_name)
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self.key_downloads[server_name] = deferred
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deferred.addBoth(rm, server_name)
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def _get_server_verify_keys(self, verify_requests):
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"""Tries to find at least one key for each verify request
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For each verify_request, verify_request.deferred is called back with
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params (server_name, key_id, VerifyKey) if a key is found, or errbacked
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with a SynapseError if none of the keys are found.
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Args:
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verify_requests (list[VerifyKeyRequest]): list of verify requests
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"""
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# These are functions that produce keys given a list of key ids
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key_fetch_fns = (
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self.get_keys_from_store, # First try the local store
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self.get_keys_from_perspectives, # Then try via perspectives
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self.get_keys_from_server, # Then try directly
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)
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@defer.inlineCallbacks
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def do_iterations():
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with Measure(self.clock, "get_server_verify_keys"):
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# dict[str, dict[str, VerifyKey]]: results so far.
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# map server_name -> key_id -> VerifyKey
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merged_results = {}
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# dict[str, set(str)]: keys to fetch for each server
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missing_keys = {}
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for verify_request in verify_requests:
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missing_keys.setdefault(verify_request.server_name, set()).update(
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verify_request.key_ids
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)
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for fn in key_fetch_fns:
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results = yield fn(missing_keys.items())
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merged_results.update(results)
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# We now need to figure out which verify requests we have keys
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# for and which we don't
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missing_keys = {}
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requests_missing_keys = []
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for verify_request in verify_requests:
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server_name = verify_request.server_name
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result_keys = merged_results[server_name]
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if verify_request.deferred.called:
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# We've already called this deferred, which probably
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# means that we've already found a key for it.
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continue
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for key_id in verify_request.key_ids:
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if key_id in result_keys:
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with PreserveLoggingContext():
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verify_request.deferred.callback((
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server_name,
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key_id,
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result_keys[key_id],
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))
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break
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else:
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# The else block is only reached if the loop above
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# doesn't break.
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missing_keys.setdefault(server_name, set()).update(
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verify_request.key_ids
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)
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requests_missing_keys.append(verify_request)
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if not missing_keys:
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break
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with PreserveLoggingContext():
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for verify_request in requests_missing_keys:
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verify_request.deferred.errback(SynapseError(
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401,
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"No key for %s with id %s" % (
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verify_request.server_name, verify_request.key_ids,
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),
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Codes.UNAUTHORIZED,
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))
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def on_err(err):
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with PreserveLoggingContext():
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for verify_request in verify_requests:
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if not verify_request.deferred.called:
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verify_request.deferred.errback(err)
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run_in_background(do_iterations).addErrback(on_err)
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@defer.inlineCallbacks
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def get_keys_from_store(self, server_name_and_key_ids):
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"""
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Args:
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server_name_and_key_ids (list[(str, iterable[str])]):
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list of (server_name, iterable[key_id]) tuples to fetch keys for
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Returns:
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Deferred: resolves to dict[str, dict[str, VerifyKey]]: map from
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server_name -> key_id -> VerifyKey
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"""
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res = yield logcontext.make_deferred_yieldable(defer.gatherResults(
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[
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run_in_background(
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self.store.get_server_verify_keys,
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server_name, key_ids,
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).addCallback(lambda ks, server: (server, ks), server_name)
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for server_name, key_ids in server_name_and_key_ids
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],
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consumeErrors=True,
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).addErrback(unwrapFirstError))
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defer.returnValue(dict(res))
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@defer.inlineCallbacks
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def get_keys_from_perspectives(self, server_name_and_key_ids):
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@defer.inlineCallbacks
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def get_key(perspective_name, perspective_keys):
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try:
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result = yield self.get_server_verify_key_v2_indirect(
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server_name_and_key_ids, perspective_name, perspective_keys
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)
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defer.returnValue(result)
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except KeyLookupError as e:
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logger.warning(
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"Key lookup failed from %r: %s", perspective_name, e,
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)
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except Exception as e:
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logger.exception(
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"Unable to get key from %r: %s %s",
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perspective_name,
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type(e).__name__, str(e),
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)
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defer.returnValue({})
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results = yield logcontext.make_deferred_yieldable(defer.gatherResults(
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[
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run_in_background(get_key, p_name, p_keys)
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for p_name, p_keys in self.perspective_servers.items()
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],
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consumeErrors=True,
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).addErrback(unwrapFirstError))
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union_of_keys = {}
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for result in results:
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for server_name, keys in result.items():
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union_of_keys.setdefault(server_name, {}).update(keys)
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defer.returnValue(union_of_keys)
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@defer.inlineCallbacks
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def get_keys_from_server(self, server_name_and_key_ids):
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results = yield logcontext.make_deferred_yieldable(defer.gatherResults(
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[
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run_in_background(
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self.get_server_verify_key_v2_direct,
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server_name,
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key_ids,
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)
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for server_name, key_ids in server_name_and_key_ids
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],
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consumeErrors=True,
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).addErrback(unwrapFirstError))
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merged = {}
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for result in results:
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merged.update(result)
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defer.returnValue({
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server_name: keys
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for server_name, keys in merged.items()
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if keys
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})
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@defer.inlineCallbacks
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def get_server_verify_key_v2_indirect(self, server_names_and_key_ids,
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perspective_name,
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perspective_keys):
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# TODO(mark): Set the minimum_valid_until_ts to that needed by
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# the events being validated or the current time if validating
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# an incoming request.
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try:
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query_response = yield self.client.post_json(
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destination=perspective_name,
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path="/_matrix/key/v2/query",
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data={
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u"server_keys": {
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server_name: {
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key_id: {
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u"minimum_valid_until_ts": 0
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} for key_id in key_ids
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}
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for server_name, key_ids in server_names_and_key_ids
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}
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},
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long_retries=True,
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)
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except (NotRetryingDestination, RequestSendFailed) as e:
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raise_from(
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KeyLookupError("Failed to connect to remote server"), e,
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)
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except HttpResponseException as e:
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raise_from(
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KeyLookupError("Remote server returned an error"), e,
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)
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keys = {}
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responses = query_response["server_keys"]
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for response in responses:
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if (u"signatures" not in response
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or perspective_name not in response[u"signatures"]):
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raise KeyLookupError(
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"Key response not signed by perspective server"
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" %r" % (perspective_name,)
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)
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verified = False
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for key_id in response[u"signatures"][perspective_name]:
|
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if key_id in perspective_keys:
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verify_signed_json(
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response,
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perspective_name,
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perspective_keys[key_id]
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)
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verified = True
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if not verified:
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logging.info(
|
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"Response from perspective server %r not signed with a"
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|
" known key, signed with: %r, known keys: %r",
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perspective_name,
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list(response[u"signatures"][perspective_name]),
|
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list(perspective_keys)
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)
|
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raise KeyLookupError(
|
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"Response not signed with a known key for perspective"
|
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" server %r" % (perspective_name,)
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)
|
|
|
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processed_response = yield self.process_v2_response(
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perspective_name, response, only_from_server=False
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)
|
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for server_name, response_keys in processed_response.items():
|
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keys.setdefault(server_name, {}).update(response_keys)
|
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|
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yield logcontext.make_deferred_yieldable(defer.gatherResults(
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[
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run_in_background(
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self.store_keys,
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server_name=server_name,
|
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from_server=perspective_name,
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verify_keys=response_keys,
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)
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for server_name, response_keys in keys.items()
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],
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consumeErrors=True
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).addErrback(unwrapFirstError))
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|
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defer.returnValue(keys)
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|
|
@defer.inlineCallbacks
|
|
def get_server_verify_key_v2_direct(self, server_name, key_ids):
|
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keys = {}
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|
|
|
for requested_key_id in key_ids:
|
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if requested_key_id in keys:
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continue
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|
|
try:
|
|
response = yield self.client.get_json(
|
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destination=server_name,
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path="/_matrix/key/v2/server/" + urllib.parse.quote(requested_key_id),
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ignore_backoff=True,
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)
|
|
except (NotRetryingDestination, RequestSendFailed) as e:
|
|
raise_from(
|
|
KeyLookupError("Failed to connect to remote server"), e,
|
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)
|
|
except HttpResponseException as e:
|
|
raise_from(
|
|
KeyLookupError("Remote server returned an error"), e,
|
|
)
|
|
|
|
if (u"signatures" not in response
|
|
or server_name not in response[u"signatures"]):
|
|
raise KeyLookupError("Key response not signed by remote server")
|
|
|
|
response_keys = yield self.process_v2_response(
|
|
from_server=server_name,
|
|
requested_ids=[requested_key_id],
|
|
response_json=response,
|
|
)
|
|
|
|
keys.update(response_keys)
|
|
|
|
yield logcontext.make_deferred_yieldable(defer.gatherResults(
|
|
[
|
|
run_in_background(
|
|
self.store_keys,
|
|
server_name=key_server_name,
|
|
from_server=server_name,
|
|
verify_keys=verify_keys,
|
|
)
|
|
for key_server_name, verify_keys in keys.items()
|
|
],
|
|
consumeErrors=True
|
|
).addErrback(unwrapFirstError))
|
|
|
|
defer.returnValue(keys)
|
|
|
|
@defer.inlineCallbacks
|
|
def process_v2_response(self, from_server, response_json,
|
|
requested_ids=[], only_from_server=True):
|
|
time_now_ms = self.clock.time_msec()
|
|
response_keys = {}
|
|
verify_keys = {}
|
|
for key_id, key_data in response_json["verify_keys"].items():
|
|
if is_signing_algorithm_supported(key_id):
|
|
key_base64 = key_data["key"]
|
|
key_bytes = decode_base64(key_base64)
|
|
verify_key = decode_verify_key_bytes(key_id, key_bytes)
|
|
verify_key.time_added = time_now_ms
|
|
verify_keys[key_id] = verify_key
|
|
|
|
old_verify_keys = {}
|
|
for key_id, key_data in response_json["old_verify_keys"].items():
|
|
if is_signing_algorithm_supported(key_id):
|
|
key_base64 = key_data["key"]
|
|
key_bytes = decode_base64(key_base64)
|
|
verify_key = decode_verify_key_bytes(key_id, key_bytes)
|
|
verify_key.expired = key_data["expired_ts"]
|
|
verify_key.time_added = time_now_ms
|
|
old_verify_keys[key_id] = verify_key
|
|
|
|
results = {}
|
|
server_name = response_json["server_name"]
|
|
if only_from_server:
|
|
if server_name != from_server:
|
|
raise KeyLookupError(
|
|
"Expected a response for server %r not %r" % (
|
|
from_server, server_name
|
|
)
|
|
)
|
|
for key_id in response_json["signatures"].get(server_name, {}):
|
|
if key_id not in response_json["verify_keys"]:
|
|
raise KeyLookupError(
|
|
"Key response must include verification keys for all"
|
|
" signatures"
|
|
)
|
|
if key_id in verify_keys:
|
|
verify_signed_json(
|
|
response_json,
|
|
server_name,
|
|
verify_keys[key_id]
|
|
)
|
|
|
|
signed_key_json = sign_json(
|
|
response_json,
|
|
self.config.server_name,
|
|
self.config.signing_key[0],
|
|
)
|
|
|
|
signed_key_json_bytes = encode_canonical_json(signed_key_json)
|
|
ts_valid_until_ms = signed_key_json[u"valid_until_ts"]
|
|
|
|
updated_key_ids = set(requested_ids)
|
|
updated_key_ids.update(verify_keys)
|
|
updated_key_ids.update(old_verify_keys)
|
|
|
|
response_keys.update(verify_keys)
|
|
response_keys.update(old_verify_keys)
|
|
|
|
yield logcontext.make_deferred_yieldable(defer.gatherResults(
|
|
[
|
|
run_in_background(
|
|
self.store.store_server_keys_json,
|
|
server_name=server_name,
|
|
key_id=key_id,
|
|
from_server=server_name,
|
|
ts_now_ms=time_now_ms,
|
|
ts_expires_ms=ts_valid_until_ms,
|
|
key_json_bytes=signed_key_json_bytes,
|
|
)
|
|
for key_id in updated_key_ids
|
|
],
|
|
consumeErrors=True,
|
|
).addErrback(unwrapFirstError))
|
|
|
|
results[server_name] = response_keys
|
|
|
|
defer.returnValue(results)
|
|
|
|
def store_keys(self, server_name, from_server, verify_keys):
|
|
"""Store a collection of verify keys for a given server
|
|
Args:
|
|
server_name(str): The name of the server the keys are for.
|
|
from_server(str): The server the keys were downloaded from.
|
|
verify_keys(dict): A mapping of key_id to VerifyKey.
|
|
Returns:
|
|
A deferred that completes when the keys are stored.
|
|
"""
|
|
# TODO(markjh): Store whether the keys have expired.
|
|
return logcontext.make_deferred_yieldable(defer.gatherResults(
|
|
[
|
|
run_in_background(
|
|
self.store.store_server_verify_key,
|
|
server_name, server_name, key.time_added, key
|
|
)
|
|
for key_id, key in verify_keys.items()
|
|
],
|
|
consumeErrors=True,
|
|
).addErrback(unwrapFirstError))
|
|
|
|
|
|
@defer.inlineCallbacks
|
|
def _handle_key_deferred(verify_request):
|
|
"""Waits for the key to become available, and then performs a verification
|
|
|
|
Args:
|
|
verify_request (VerifyKeyRequest):
|
|
|
|
Returns:
|
|
Deferred[None]
|
|
|
|
Raises:
|
|
SynapseError if there was a problem performing the verification
|
|
"""
|
|
server_name = verify_request.server_name
|
|
try:
|
|
with PreserveLoggingContext():
|
|
_, key_id, verify_key = yield verify_request.deferred
|
|
except KeyLookupError as e:
|
|
logger.warn(
|
|
"Failed to download keys for %s: %s %s",
|
|
server_name, type(e).__name__, str(e),
|
|
)
|
|
raise SynapseError(
|
|
502,
|
|
"Error downloading keys for %s" % (server_name,),
|
|
Codes.UNAUTHORIZED,
|
|
)
|
|
except Exception as e:
|
|
logger.exception(
|
|
"Got Exception when downloading keys for %s: %s %s",
|
|
server_name, type(e).__name__, str(e),
|
|
)
|
|
raise SynapseError(
|
|
401,
|
|
"No key for %s with id %s" % (server_name, verify_request.key_ids),
|
|
Codes.UNAUTHORIZED,
|
|
)
|
|
|
|
json_object = verify_request.json_object
|
|
|
|
logger.debug("Got key %s %s:%s for server %s, verifying" % (
|
|
key_id, verify_key.alg, verify_key.version, server_name,
|
|
))
|
|
try:
|
|
verify_signed_json(json_object, server_name, verify_key)
|
|
except SignatureVerifyException as e:
|
|
logger.debug(
|
|
"Error verifying signature for %s:%s:%s with key %s: %s",
|
|
server_name, verify_key.alg, verify_key.version,
|
|
encode_verify_key_base64(verify_key),
|
|
str(e),
|
|
)
|
|
raise SynapseError(
|
|
401,
|
|
"Invalid signature for server %s with key %s:%s: %s" % (
|
|
server_name, verify_key.alg, verify_key.version, str(e),
|
|
),
|
|
Codes.UNAUTHORIZED,
|
|
)
|