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c5c24c239b
preserve_context_over_fn is essentially broken, because (a) it pointlessly drops the current logcontext before calling its wrapped function, which means we don't get any useful logcontexts for _handle_key_deferred; (b) it wraps the resulting deferred in a _PreservingContextDeferred, which is very dangerous because you then can't yield on it without leaking context back into the reactor. Instead, let's specify that the resultant deferreds call their callbacks with no logcontext.
770 lines
28 KiB
Python
770 lines
28 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014-2016 OpenMarket Ltd
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# Copyright 2017 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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from synapse.crypto.keyclient import fetch_server_key
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from synapse.api.errors import SynapseError, Codes
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from synapse.util import unwrapFirstError, logcontext
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from synapse.util.logcontext import (
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PreserveLoggingContext,
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preserve_fn
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)
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from synapse.util.metrics import Measure
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from twisted.internet import defer
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from signedjson.sign import (
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verify_signed_json, signature_ids, sign_json, encode_canonical_json
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)
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from signedjson.key import (
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is_signing_algorithm_supported, decode_verify_key_bytes
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)
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from unpaddedbase64 import decode_base64, encode_base64
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from OpenSSL import crypto
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from collections import namedtuple
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import urllib
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import hashlib
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import logging
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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(twisted.internet.defer.Deferred):
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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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preserve_fn(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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# 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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@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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while True:
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wait_on = [
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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 wait_on:
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with PreserveLoggingContext():
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yield defer.DeferredList(wait_on)
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else:
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break
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def rm(r, 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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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.values():
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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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preserve_fn(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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preserve_fn(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 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.message),
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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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preserve_fn(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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@defer.inlineCallbacks
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def get_key(server_name, key_ids):
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keys = None
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try:
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keys = yield self.get_server_verify_key_v2_direct(
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server_name, key_ids
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)
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except Exception as e:
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logger.info(
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"Unable to get key %r for %r directly: %s %s",
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key_ids, server_name,
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type(e).__name__, str(e.message),
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)
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if not keys:
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keys = yield self.get_server_verify_key_v1_direct(
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server_name, key_ids
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)
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keys = {server_name: keys}
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defer.returnValue(keys)
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results = yield logcontext.make_deferred_yieldable(defer.gatherResults(
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[
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preserve_fn(get_key)(server_name, key_ids)
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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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query_response = yield self.client.post_json(
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destination=perspective_name,
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path=b"/_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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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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yield logcontext.make_deferred_yieldable(defer.gatherResults(
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[
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preserve_fn(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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defer.returnValue(keys)
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@defer.inlineCallbacks
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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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(response, tls_certificate) = yield fetch_server_key(
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server_name, self.hs.tls_server_context_factory,
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path=(b"/_matrix/key/v2/server/%s" % (
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urllib.quote(requested_key_id),
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)).encode("ascii"),
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)
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if (u"signatures" not in response
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or server_name not in response[u"signatures"]):
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raise KeyLookupError("Key response not signed by remote server")
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if "tls_fingerprints" not in response:
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raise KeyLookupError("Key response missing TLS fingerprints")
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certificate_bytes = crypto.dump_certificate(
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crypto.FILETYPE_ASN1, tls_certificate
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)
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sha256_fingerprint = hashlib.sha256(certificate_bytes).digest()
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sha256_fingerprint_b64 = encode_base64(sha256_fingerprint)
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response_sha256_fingerprints = set()
|
|
for fingerprint in response[u"tls_fingerprints"]:
|
|
if u"sha256" in fingerprint:
|
|
response_sha256_fingerprints.add(fingerprint[u"sha256"])
|
|
|
|
if sha256_fingerprint_b64 not in response_sha256_fingerprints:
|
|
raise KeyLookupError("TLS certificate not allowed by fingerprints")
|
|
|
|
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(
|
|
[
|
|
preserve_fn(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(
|
|
[
|
|
preserve_fn(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)
|
|
|
|
@defer.inlineCallbacks
|
|
def get_server_verify_key_v1_direct(self, server_name, key_ids):
|
|
"""Finds a verification key for the server with one of the key ids.
|
|
Args:
|
|
server_name (str): The name of the server to fetch a key for.
|
|
keys_ids (list of str): The key_ids to check for.
|
|
"""
|
|
|
|
# Try to fetch the key from the remote server.
|
|
|
|
(response, tls_certificate) = yield fetch_server_key(
|
|
server_name, self.hs.tls_server_context_factory
|
|
)
|
|
|
|
# Check the response.
|
|
|
|
x509_certificate_bytes = crypto.dump_certificate(
|
|
crypto.FILETYPE_ASN1, tls_certificate
|
|
)
|
|
|
|
if ("signatures" not in response
|
|
or server_name not in response["signatures"]):
|
|
raise KeyLookupError("Key response not signed by remote server")
|
|
|
|
if "tls_certificate" not in response:
|
|
raise KeyLookupError("Key response missing TLS certificate")
|
|
|
|
tls_certificate_b64 = response["tls_certificate"]
|
|
|
|
if encode_base64(x509_certificate_bytes) != tls_certificate_b64:
|
|
raise KeyLookupError("TLS certificate doesn't match")
|
|
|
|
# Cache the result in the datastore.
|
|
|
|
time_now_ms = self.clock.time_msec()
|
|
|
|
verify_keys = {}
|
|
for key_id, key_base64 in response["verify_keys"].items():
|
|
if is_signing_algorithm_supported(key_id):
|
|
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
|
|
|
|
for key_id in response["signatures"][server_name]:
|
|
if key_id not in response["verify_keys"]:
|
|
raise KeyLookupError(
|
|
"Key response must include verification keys for all"
|
|
" signatures"
|
|
)
|
|
if key_id in verify_keys:
|
|
verify_signed_json(
|
|
response,
|
|
server_name,
|
|
verify_keys[key_id]
|
|
)
|
|
|
|
yield self.store.store_server_certificate(
|
|
server_name,
|
|
server_name,
|
|
time_now_ms,
|
|
tls_certificate,
|
|
)
|
|
|
|
yield self.store_keys(
|
|
server_name=server_name,
|
|
from_server=server_name,
|
|
verify_keys=verify_keys,
|
|
)
|
|
|
|
defer.returnValue(verify_keys)
|
|
|
|
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(
|
|
[
|
|
preserve_fn(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):
|
|
server_name = verify_request.server_name
|
|
try:
|
|
with PreserveLoggingContext():
|
|
_, key_id, verify_key = yield verify_request.deferred
|
|
except IOError as e:
|
|
logger.warn(
|
|
"Got IOError when downloading keys for %s: %s %s",
|
|
server_name, type(e).__name__, str(e.message),
|
|
)
|
|
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.message),
|
|
)
|
|
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:
|
|
raise SynapseError(
|
|
401,
|
|
"Invalid signature for server %s with key %s:%s" % (
|
|
server_name, verify_key.alg, verify_key.version
|
|
),
|
|
Codes.UNAUTHORIZED,
|
|
)
|