diff options
| -rw-r--r-- | changelog.d/10035.feature | 1 | ||||
| -rw-r--r-- | synapse/crypto/keyring.py | 642 | ||||
| -rw-r--r-- | synapse/federation/transport/server.py | 4 | ||||
| -rw-r--r-- | synapse/groups/attestations.py | 4 | ||||
| -rw-r--r-- | synapse/rest/key/v2/remote_key_resource.py | 9 | ||||
| -rw-r--r-- | tests/crypto/test_keyring.py | 170 | ||||
| -rw-r--r-- | tests/rest/key/v2/test_remote_key_resource.py | 18 | ||||
| -rw-r--r-- | tests/util/test_batching_queue.py | 37 |
8 files changed, 393 insertions, 492 deletions
diff --git a/changelog.d/10035.feature b/changelog.d/10035.feature new file mode 100644 index 0000000000..68052b5a7e --- /dev/null +++ b/changelog.d/10035.feature @@ -0,0 +1 @@ +Rewrite logic around verifying JSON object and fetching server keys to be more performant and use less memory. diff --git a/synapse/crypto/keyring.py b/synapse/crypto/keyring.py index 6fc0712978..c840ffca71 100644 --- a/synapse/crypto/keyring.py +++ b/synapse/crypto/keyring.py @@ -16,8 +16,7 @@ import abc import logging import urllib -from collections import defaultdict -from typing import TYPE_CHECKING, Callable, Dict, Iterable, List, Optional, Set, Tuple +from typing import TYPE_CHECKING, Callable, Dict, Iterable, List, Optional, Tuple import attr from signedjson.key import ( @@ -44,17 +43,12 @@ from synapse.api.errors import ( from synapse.config.key import TrustedKeyServer from synapse.events import EventBase from synapse.events.utils import prune_event_dict -from synapse.logging.context import ( - PreserveLoggingContext, - make_deferred_yieldable, - preserve_fn, - run_in_background, -) +from synapse.logging.context import make_deferred_yieldable, run_in_background from synapse.storage.keys import FetchKeyResult from synapse.types import JsonDict from synapse.util import unwrapFirstError from synapse.util.async_helpers import yieldable_gather_results -from synapse.util.metrics import Measure +from synapse.util.batching_queue import BatchingQueue from synapse.util.retryutils import NotRetryingDestination if TYPE_CHECKING: @@ -80,32 +74,19 @@ class VerifyJsonRequest: minimum_valid_until_ts: time at which we require the signing key to be valid. (0 implies we don't care) - request_name: The name of the request. - key_ids: The set of key_ids to that could be used to verify the JSON object - - key_ready (Deferred[str, str, nacl.signing.VerifyKey]): - A deferred (server_name, key_id, verify_key) tuple that resolves when - a verify key has been fetched. The deferreds' callbacks are run with no - logcontext. - - If we are unable to find a key which satisfies the request, the deferred - errbacks with an M_UNAUTHORIZED SynapseError. """ server_name = attr.ib(type=str) get_json_object = attr.ib(type=Callable[[], JsonDict]) minimum_valid_until_ts = attr.ib(type=int) - request_name = attr.ib(type=str) key_ids = attr.ib(type=List[str]) - key_ready = attr.ib(default=attr.Factory(defer.Deferred), type=defer.Deferred) @staticmethod def from_json_object( server_name: str, json_object: JsonDict, minimum_valid_until_ms: int, - request_name: str, ): """Create a VerifyJsonRequest to verify all signatures on a signed JSON object for the given server. @@ -115,7 +96,6 @@ class VerifyJsonRequest: server_name, lambda: json_object, minimum_valid_until_ms, - request_name=request_name, key_ids=key_ids, ) @@ -135,16 +115,48 @@ class VerifyJsonRequest: # memory than the Event object itself. lambda: prune_event_dict(event.room_version, event.get_pdu_json()), minimum_valid_until_ms, - request_name=event.event_id, key_ids=key_ids, ) + def to_fetch_key_request(self) -> "_FetchKeyRequest": + """Create a key fetch request for all keys needed to satisfy the + verification request. + """ + return _FetchKeyRequest( + server_name=self.server_name, + minimum_valid_until_ts=self.minimum_valid_until_ts, + key_ids=self.key_ids, + ) + class KeyLookupError(ValueError): pass +@attr.s(slots=True) +class _FetchKeyRequest: + """A request for keys for a given server. + + We will continue to try and fetch until we have all the keys listed under + `key_ids` (with an appropriate `valid_until_ts` property) or we run out of + places to fetch keys from. + + Attributes: + server_name: The name of the server that owns the keys. + minimum_valid_until_ts: The timestamp which the keys must be valid until. + key_ids: The IDs of the keys to attempt to fetch + """ + + server_name = attr.ib(type=str) + minimum_valid_until_ts = attr.ib(type=int) + key_ids = attr.ib(type=List[str]) + + class Keyring: + """Handles verifying signed JSON objects and fetching the keys needed to do + so. + """ + def __init__( self, hs: "HomeServer", key_fetchers: "Optional[Iterable[KeyFetcher]]" = None ): @@ -158,22 +170,22 @@ class Keyring: ) self._key_fetchers = key_fetchers - # map from server name to Deferred. Has an entry for each server with - # an ongoing key download; the Deferred completes once the download - # completes. - # - # These are regular, logcontext-agnostic Deferreds. - self.key_downloads = {} # type: Dict[str, defer.Deferred] + self._server_queue = BatchingQueue( + "keyring_server", + clock=hs.get_clock(), + process_batch_callback=self._inner_fetch_key_requests, + ) # type: BatchingQueue[_FetchKeyRequest, Dict[str, Dict[str, FetchKeyResult]]] - def verify_json_for_server( + async def verify_json_for_server( self, server_name: str, json_object: JsonDict, validity_time: int, - request_name: str, - ) -> defer.Deferred: + ) -> None: """Verify that a JSON object has been signed by a given server + Completes if the the object was correctly signed, otherwise raises. + Args: server_name: name of the server which must have signed this object @@ -181,52 +193,45 @@ class Keyring: validity_time: timestamp at which we require the signing key to be valid. (0 implies we don't care) - - request_name: an identifier for this json object (eg, an event id) - for logging. - - Returns: - Deferred[None]: completes if the the object was correctly signed, otherwise - errbacks with an error """ request = VerifyJsonRequest.from_json_object( server_name, json_object, validity_time, - request_name, ) - requests = (request,) - return make_deferred_yieldable(self._verify_objects(requests)[0]) + return await self.process_request(request) def verify_json_objects_for_server( - self, server_and_json: Iterable[Tuple[str, dict, int, str]] + self, server_and_json: Iterable[Tuple[str, dict, int]] ) -> List[defer.Deferred]: """Bulk verifies signatures of json objects, bulk fetching keys as necessary. Args: server_and_json: - Iterable of (server_name, json_object, validity_time, request_name) + Iterable of (server_name, json_object, validity_time) tuples. validity_time is a timestamp at which the signing key must be valid. - request_name is an identifier for this json object (eg, an event id) - for logging. - Returns: List<Deferred[None]>: for each input triplet, a deferred indicating success or failure to verify each json object's signature for the given server_name. The deferreds run their callbacks in the sentinel logcontext. """ - return self._verify_objects( - VerifyJsonRequest.from_json_object( - server_name, json_object, validity_time, request_name + return [ + run_in_background( + self.process_request, + VerifyJsonRequest.from_json_object( + server_name, + json_object, + validity_time, + ), ) - for server_name, json_object, validity_time, request_name in server_and_json - ) + for server_name, json_object, validity_time in server_and_json + ] def verify_events_for_server( self, server_and_events: Iterable[Tuple[str, EventBase, int]] @@ -252,321 +257,223 @@ class Keyring: server_name. The deferreds run their callbacks in the sentinel logcontext. """ - return self._verify_objects( - VerifyJsonRequest.from_event(server_name, event, validity_time) + return [ + run_in_background( + self.process_request, + VerifyJsonRequest.from_event( + server_name, + event, + validity_time, + ), + ) for server_name, event, validity_time in server_and_events - ) - - def _verify_objects( - self, verify_requests: Iterable[VerifyJsonRequest] - ) -> List[defer.Deferred]: - """Does the work of verify_json_[objects_]for_server - - - Args: - verify_requests: Iterable of verification requests. + ] - Returns: - List<Deferred[None]>: for each input item, a deferred indicating success - or failure to verify each json object's signature for the given - server_name. The deferreds run their callbacks in the sentinel - logcontext. + async def process_request(self, verify_request: VerifyJsonRequest) -> None: + """Processes the `VerifyJsonRequest`. Raises if the object is not signed + by the server, the signatures don't match or we failed to fetch the + necessary keys. """ - # a list of VerifyJsonRequests which are awaiting a key lookup - key_lookups = [] - handle = preserve_fn(_handle_key_deferred) - - def process(verify_request: VerifyJsonRequest) -> defer.Deferred: - """Process an entry in the request list - - Adds a key request to key_lookups, and returns a deferred which - will complete or fail (in the sentinel context) when verification completes. - """ - if not verify_request.key_ids: - return defer.fail( - SynapseError( - 400, - "Not signed by %s" % (verify_request.server_name,), - Codes.UNAUTHORIZED, - ) - ) - logger.debug( - "Verifying %s for %s with key_ids %s, min_validity %i", - verify_request.request_name, - verify_request.server_name, - verify_request.key_ids, - verify_request.minimum_valid_until_ts, + if not verify_request.key_ids: + raise SynapseError( + 400, + f"Not signed by {verify_request.server_name}", + Codes.UNAUTHORIZED, ) - # add the key request to the queue, but don't start it off yet. - key_lookups.append(verify_request) - - # now run _handle_key_deferred, which will wait for the key request - # to complete and then do the verification. - # - # We want _handle_key_request to log to the right context, so we - # wrap it with preserve_fn (aka run_in_background) - return handle(verify_request) - - results = [process(r) for r in verify_requests] - - if key_lookups: - run_in_background(self._start_key_lookups, key_lookups) - - return results - - async def _start_key_lookups( - self, verify_requests: List[VerifyJsonRequest] - ) -> None: - """Sets off the key fetches for each verify request - - Once each fetch completes, verify_request.key_ready will be resolved. - - Args: - verify_requests: - """ - - try: - # map from server name to a set of outstanding request ids - server_to_request_ids = {} # type: Dict[str, Set[int]] - - for verify_request in verify_requests: - server_name = verify_request.server_name - request_id = id(verify_request) - server_to_request_ids.setdefault(server_name, set()).add(request_id) - - # Wait for any previous lookups to complete before proceeding. - await self.wait_for_previous_lookups(server_to_request_ids.keys()) - - # take out a lock on each of the servers by sticking a Deferred in - # key_downloads - for server_name in server_to_request_ids.keys(): - self.key_downloads[server_name] = defer.Deferred() - logger.debug("Got key lookup lock on %s", server_name) - - # When we've finished fetching all the keys for a given server_name, - # drop the lock by resolving the deferred in key_downloads. - def drop_server_lock(server_name): - d = self.key_downloads.pop(server_name) - d.callback(None) - - def lookup_done(res, verify_request): - server_name = verify_request.server_name - server_requests = server_to_request_ids[server_name] - server_requests.remove(id(verify_request)) - - # if there are no more requests for this server, we can drop the lock. - if not server_requests: - logger.debug("Releasing key lookup lock on %s", server_name) - drop_server_lock(server_name) - - return res + # Add the keys we need to verify to the queue for retrieval. We queue + # up requests for the same server so we don't end up with many in flight + # requests for the same keys. + key_request = verify_request.to_fetch_key_request() + found_keys_by_server = await self._server_queue.add_to_queue( + key_request, key=verify_request.server_name + ) - for verify_request in verify_requests: - verify_request.key_ready.addBoth(lookup_done, verify_request) + # Since we batch up requests the returned set of keys may contain keys + # from other servers, so we pull out only the ones we care about.s + found_keys = found_keys_by_server.get(verify_request.server_name, {}) - # Actually start fetching keys. - self._get_server_verify_keys(verify_requests) - except Exception: - logger.exception("Error starting key lookups") + # Verify each signature we got valid keys for, raising if we can't + # verify any of them. + verified = False + for key_id in verify_request.key_ids: + key_result = found_keys.get(key_id) + if not key_result: + continue - async def wait_for_previous_lookups(self, server_names: Iterable[str]) -> None: - """Waits for any previous key lookups for the given servers to finish. + if key_result.valid_until_ts < verify_request.minimum_valid_until_ts: + continue - Args: - server_names: list of servers which we want to look up + verify_key = key_result.verify_key + json_object = verify_request.get_json_object() + try: + verify_signed_json( + json_object, + verify_request.server_name, + verify_key, + ) + verified = True + except SignatureVerifyException as e: + logger.debug( + "Error verifying signature for %s:%s:%s with key %s: %s", + verify_request.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" + % ( + verify_request.server_name, + verify_key.alg, + verify_key.version, + str(e), + ), + Codes.UNAUTHORIZED, + ) - Returns: - Resolves once all key lookups for the given servers have - completed. Follows the synapse rules of logcontext preservation. - """ - loop_count = 1 - while True: - wait_on = [ - (server_name, self.key_downloads[server_name]) - for server_name in server_names - if server_name in self.key_downloads - ] - if not wait_on: - break - logger.info( - "Waiting for existing lookups for %s to complete [loop %i]", - [w[0] for w in wait_on], - loop_count, + if not verified: + raise SynapseError( + 401, + f"Failed to find any key to satisfy: {key_request}", + Codes.UNAUTHORIZED, ) - with PreserveLoggingContext(): - await defer.DeferredList((w[1] for w in wait_on)) - loop_count += 1 + async def _inner_fetch_key_requests( + self, requests: List[_FetchKeyRequest] + ) -> Dict[str, Dict[str, FetchKeyResult]]: + """Processing function for the queue of `_FetchKeyRequest`.""" + + logger.debug("Starting fetch for %s", requests) + + # First we need to deduplicate requests for the same key. We do this by + # taking the *maximum* requested `minimum_valid_until_ts` for each pair + # of server name/key ID. + server_to_key_to_ts = {} # type: Dict[str, Dict[str, int]] + for request in requests: + by_server = server_to_key_to_ts.setdefault(request.server_name, {}) + for key_id in request.key_ids: + existing_ts = by_server.get(key_id, 0) + by_server[key_id] = max(request.minimum_valid_until_ts, existing_ts) + + deduped_requests = [ + _FetchKeyRequest(server_name, minimum_valid_ts, [key_id]) + for server_name, by_server in server_to_key_to_ts.items() + for key_id, minimum_valid_ts in by_server.items() + ] + + logger.debug("Deduplicated key requests to %s", deduped_requests) + + # For each key we call `_inner_verify_request` which will handle + # fetching each key. Note these shouldn't throw if we fail to contact + # other servers etc. + results_per_request = await yieldable_gather_results( + self._inner_fetch_key_request, + deduped_requests, + ) - def _get_server_verify_keys(self, verify_requests: List[VerifyJsonRequest]) -> None: - """Tries to find at least one key for each verify request + # We now convert the returned list of results into a map from server + # name to key ID to FetchKeyResult, to return. + to_return = {} # type: Dict[str, Dict[str, FetchKeyResult]] + for (request, results) in zip(deduped_requests, results_per_request): + to_return_by_server = to_return.setdefault(request.server_name, {}) + for key_id, key_result in results.items(): + existing = to_return_by_server.get(key_id) + if not existing or existing.valid_until_ts < key_result.valid_until_ts: + to_return_by_server[key_id] = key_result - For each verify_request, verify_request.key_ready is called back with - params (server_name, key_id, VerifyKey) if a key is found, or errbacked - with a SynapseError if none of the keys are found. + return to_return - Args: - verify_requests: list of verify requests + async def _inner_fetch_key_request( + self, verify_request: _FetchKeyRequest + ) -> Dict[str, FetchKeyResult]: + """Attempt to fetch the given key by calling each key fetcher one by + one. """ + logger.debug("Starting fetch for %s", verify_request) - remaining_requests = {rq for rq in verify_requests if not rq.key_ready.called} + found_keys: Dict[str, FetchKeyResult] = {} + missing_key_ids = set(verify_request.key_ids) - async def do_iterations(): - try: - with Measure(self.clock, "get_server_verify_keys"): - for f in self._key_fetchers: - if not remaining_requests: - return - await self._attempt_key_fetches_with_fetcher( - f, remaining_requests - ) - - # look for any requests which weren't satisfied - while remaining_requests: - verify_request = remaining_requests.pop() - rq_str = ( - "VerifyJsonRequest(server=%s, key_ids=%s, min_valid=%i)" - % ( - verify_request.server_name, - verify_request.key_ids, - verify_request.minimum_valid_until_ts, - ) - ) - - # If we run the errback immediately, it may cancel our - # loggingcontext while we are still in it, so instead we - # schedule it for the next time round the reactor. - # - # (this also ensures that we don't get a stack overflow if we - # has a massive queue of lookups waiting for this server). - self.clock.call_later( - 0, - verify_request.key_ready.errback, - SynapseError( - 401, - "Failed to find any key to satisfy %s" % (rq_str,), - Codes.UNAUTHORIZED, - ), - ) - except Exception as err: - # we don't really expect to get here, because any errors should already - # have been caught and logged. But if we do, let's log the error and make - # sure that all of the deferreds are resolved. - logger.error("Unexpected error in _get_server_verify_keys: %s", err) - with PreserveLoggingContext(): - for verify_request in remaining_requests: - if not verify_request.key_ready.called: - verify_request.key_ready.errback(err) - - run_in_background(do_iterations) - - async def _attempt_key_fetches_with_fetcher( - self, fetcher: "KeyFetcher", remaining_requests: Set[VerifyJsonRequest] - ): - """Use a key fetcher to attempt to satisfy some key requests + for fetcher in self._key_fetchers: + if not missing_key_ids: + break - Args: - fetcher: fetcher to use to fetch the keys - remaining_requests: outstanding key requests. - Any successfully-completed requests will be removed from the list. - """ - # The keys to fetch. - # server_name -> key_id -> min_valid_ts - missing_keys = defaultdict(dict) # type: Dict[str, Dict[str, int]] - - for verify_request in remaining_requests: - # any completed requests should already have been removed - assert not verify_request.key_ready.called - keys_for_server = missing_keys[verify_request.server_name] - - for key_id in verify_request.key_ids: - # If we have several requests for the same key, then we only need to - # request that key once, but we should do so with the greatest - # min_valid_until_ts of the requests, so that we can satisfy all of - # the requests. - keys_for_server[key_id] = max( - keys_for_server.get(key_id, -1), - verify_request.minimum_valid_until_ts, - ) + logger.debug("Getting keys from %s for %s", fetcher, verify_request) + keys = await fetcher.get_keys( + verify_request.server_name, + list(missing_key_ids), + verify_request.minimum_valid_until_ts, + ) - results = await fetcher.get_keys(missing_keys) + for key_id, key in keys.items(): + if not key: + continue - completed = [] - for verify_request in remaining_requests: - server_name = verify_request.server_name + # If we already have a result for the given key ID we keep the + # one with the highest `valid_until_ts`. + existing_key = found_keys.get(key_id) + if existing_key: + if key.valid_until_ts <= existing_key.valid_until_ts: + continue - # see if any of the keys we got this time are sufficient to - # complete this VerifyJsonRequest. - result_keys = results.get(server_name, {}) - for key_id in verify_request.key_ids: - fetch_key_result = result_keys.get(key_id) - if not fetch_key_result: - # we didn't get a result for this key - continue + # We always store the returned key even if it doesn't the + # `minimum_valid_until_ts` requirement, as some verification + # requests may still be able to be satisfied by it. + # + # We still keep looking for the key from other fetchers in that + # case though. + found_keys[key_id] = key - if ( - fetch_key_result.valid_until_ts - < verify_request.minimum_valid_until_ts - ): - # key was not valid at this point + if key.valid_until_ts < verify_request.minimum_valid_until_ts: continue - # we have a valid key for this request. If we run the callback - # immediately, it may cancel our loggingcontext while we are still in - # it, so instead we schedule it for the next time round the reactor. - # - # (this also ensures that we don't get a stack overflow if we had - # a massive queue of lookups waiting for this server). - logger.debug( - "Found key %s:%s for %s", - server_name, - key_id, - verify_request.request_name, - ) - self.clock.call_later( - 0, - verify_request.key_ready.callback, - (server_name, key_id, fetch_key_result.verify_key), - ) - completed.append(verify_request) - break + missing_key_ids.discard(key_id) - remaining_requests.difference_update(completed) + return found_keys class KeyFetcher(metaclass=abc.ABCMeta): - @abc.abstractmethod + def __init__(self, hs: "HomeServer"): + self._queue = BatchingQueue( + self.__class__.__name__, hs.get_clock(), self._fetch_keys + ) + async def get_keys( - self, keys_to_fetch: Dict[str, Dict[str, int]] - ) -> Dict[str, Dict[str, FetchKeyResult]]: - """ - Args: - keys_to_fetch: - the keys to be fetched. server_name -> key_id -> min_valid_ts + self, server_name: str, key_ids: List[str], minimum_valid_until_ts: int + ) -> Dict[str, FetchKeyResult]: + results = await self._queue.add_to_queue( + _FetchKeyRequest( + server_name=server_name, + key_ids=key_ids, + minimum_valid_until_ts=minimum_valid_until_ts, + ) + ) + return results.get(server_name, {}) - Returns: - Map from server_name -> key_id -> FetchKeyResult - """ - raise NotImplementedError + @abc.abstractmethod + async def _fetch_keys( + self, keys_to_fetch: List[_FetchKeyRequest] + ) -> Dict[str, Dict[str, FetchKeyResult]]: + pass class StoreKeyFetcher(KeyFetcher): """KeyFetcher impl which fetches keys from our data store""" def __init__(self, hs: "HomeServer"): - self.store = hs.get_datastore() + super().__init__(hs) - async def get_keys( - self, keys_to_fetch: Dict[str, Dict[str, int]] - ) -> Dict[str, Dict[str, FetchKeyResult]]: - """see KeyFetcher.get_keys""" + self.store = hs.get_datastore() + async def _fetch_keys(self, keys_to_fetch: List[_FetchKeyRequest]): key_ids_to_fetch = ( - (server_name, key_id) - for server_name, keys_for_server in keys_to_fetch.items() - for key_id in keys_for_server.keys() + (queue_value.server_name, key_id) + for queue_value in keys_to_fetch + for key_id in queue_value.key_ids ) res = await self.store.get_server_verify_keys(key_ids_to_fetch) @@ -578,6 +485,8 @@ class StoreKeyFetcher(KeyFetcher): class BaseV2KeyFetcher(KeyFetcher): def __init__(self, hs: "HomeServer"): + super().__init__(hs) + self.store = hs.get_datastore() self.config = hs.config @@ -685,10 +594,10 @@ class PerspectivesKeyFetcher(BaseV2KeyFetcher): self.client = hs.get_federation_http_client() self.key_servers = self.config.key_servers - async def get_keys( - self, keys_to_fetch: Dict[str, Dict[str, int]] + async def _fetch_keys( + self, keys_to_fetch: List[_FetchKeyRequest] ) -> Dict[str, Dict[str, FetchKeyResult]]: - """see KeyFetcher.get_keys""" + """see KeyFetcher._fetch_keys""" async def get_key(key_server: TrustedKeyServer) -> Dict: try: @@ -724,12 +633,12 @@ class PerspectivesKeyFetcher(BaseV2KeyFetcher): return union_of_keys async def get_server_verify_key_v2_indirect( - self, keys_to_fetch: Dict[str, Dict[str, int]], key_server: TrustedKeyServer + self, keys_to_fetch: List[_FetchKeyRequest], key_server: TrustedKeyServer ) -> Dict[str, Dict[str, FetchKeyResult]]: """ Args: keys_to_fetch: - the keys to be fetched. server_name -> key_id -> min_valid_ts + the keys to be fetched. key_server: notary server to query for the keys @@ -743,7 +652,7 @@ class PerspectivesKeyFetcher(BaseV2KeyFetcher): perspective_name = key_server.server_name logger.info( "Requesting keys %s from notary server %s", - keys_to_fetch.items(), + keys_to_fetch, perspective_name, ) @@ -753,11 +662,13 @@ class PerspectivesKeyFetcher(BaseV2KeyFetcher): path="/_matrix/key/v2/query", data={ "server_keys": { - server_name: { - key_id: {"minimum_valid_until_ts": min_valid_ts} - for key_id, min_valid_ts in server_keys.items() + queue_value.server_name: { + key_id: { + "minimum_valid_until_ts": queue_value.minimum_valid_until_ts, + } + for key_id in queue_value.key_ids } - for server_name, server_keys in keys_to_fetch.items() + for queue_value in keys_to_fetch } }, ) @@ -858,7 +769,20 @@ class ServerKeyFetcher(BaseV2KeyFetcher): self.client = hs.get_federation_http_client() async def get_keys( - self, keys_to_fetch: Dict[str, Dict[str, int]] + self, server_name: str, key_ids: List[str], minimum_valid_until_ts: int + ) -> Dict[str, FetchKeyResult]: + results = await self._queue.add_to_queue( + _FetchKeyRequest( + server_name=server_name, + key_ids=key_ids, + minimum_valid_until_ts=minimum_valid_until_ts, + ), + key=server_name, + ) + return results.get(server_name, {}) + + async def _fetch_keys( + self, keys_to_fetch: List[_FetchKeyRequest] ) -> Dict[str, Dict[str, FetchKeyResult]]: """ Args: @@ -871,8 +795,10 @@ class ServerKeyFetcher(BaseV2KeyFetcher): results = {} - async def get_key(key_to_fetch_item: Tuple[str, Dict[str, int]]) -> None: - server_name, key_ids = key_to_fetch_item + async def get_key(key_to_fetch_item: _FetchKeyRequest) -> None: + server_name = key_to_fetch_item.server_name + key_ids = key_to_fetch_item.key_ids + try: keys = await self.get_server_verify_key_v2_direct(server_name, key_ids) results[server_name] = keys @@ -883,7 +809,7 @@ class ServerKeyFetcher(BaseV2KeyFetcher): except Exception: logger.exception("Error getting keys %s from %s", key_ids, server_name) - await yieldable_gather_results(get_key, keys_to_fetch.items()) + await yieldable_gather_results(get_key, keys_to_fetch) return results async def get_server_verify_key_v2_direct( @@ -955,37 +881,3 @@ class ServerKeyFetcher(BaseV2KeyFetcher): keys.update(response_keys) return keys - - -async def _handle_key_deferred(verify_request: VerifyJsonRequest) -> None: - """Waits for the key to become available, and then performs a verification - - Args: - verify_request: - - Raises: - SynapseError if there was a problem performing the verification - """ - server_name = verify_request.server_name - with PreserveLoggingContext(): - _, key_id, verify_key = await verify_request.key_ready - - json_object = verify_request.get_json_object() - - 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, - ) diff --git a/synapse/federation/transport/server.py b/synapse/federation/transport/server.py index fdeaa0f37c..5756fcb551 100644 --- a/synapse/federation/transport/server.py +++ b/synapse/federation/transport/server.py @@ -152,7 +152,9 @@ class Authenticator: ) await self.keyring.verify_json_for_server( - origin, json_request, now, "Incoming request" + origin, + json_request, + now, ) logger.debug("Request from %s", origin) diff --git a/synapse/groups/attestations.py b/synapse/groups/attestations.py index d2fc8be5f5..ff8372c4e9 100644 --- a/synapse/groups/attestations.py +++ b/synapse/groups/attestations.py @@ -108,7 +108,9 @@ class GroupAttestationSigning: assert server_name is not None await self.keyring.verify_json_for_server( - server_name, attestation, now, "Group attestation" + server_name, + attestation, + now, ) def create_attestation(self, group_id: str, user_id: str) -> JsonDict: diff --git a/synapse/rest/key/v2/remote_key_resource.py b/synapse/rest/key/v2/remote_key_resource.py index aba1734a55..d56a1ae482 100644 --- a/synapse/rest/key/v2/remote_key_resource.py +++ b/synapse/rest/key/v2/remote_key_resource.py @@ -22,6 +22,7 @@ from synapse.crypto.keyring import ServerKeyFetcher from synapse.http.server import DirectServeJsonResource, respond_with_json from synapse.http.servlet import parse_integer, parse_json_object_from_request from synapse.util import json_decoder +from synapse.util.async_helpers import yieldable_gather_results logger = logging.getLogger(__name__) @@ -210,7 +211,13 @@ class RemoteKey(DirectServeJsonResource): # If there is a cache miss, request the missing keys, then recurse (and # ensure the result is sent). if cache_misses and query_remote_on_cache_miss: - await self.fetcher.get_keys(cache_misses) + await yieldable_gather_results( + lambda t: self.fetcher.get_keys(*t), + ( + (server_name, list(keys), 0) + for server_name, keys in cache_misses.items() + ), + ) await self.query_keys(request, query, query_remote_on_cache_miss=False) else: signed_keys = [] diff --git a/tests/crypto/test_keyring.py b/tests/crypto/test_keyring.py index 2775dfd880..745c295d3b 100644 --- a/tests/crypto/test_keyring.py +++ b/tests/crypto/test_keyring.py @@ -12,6 +12,7 @@ # See the License for the specific language governing permissions and # limitations under the License. import time +from typing import Dict, List from unittest.mock import Mock import attr @@ -21,7 +22,6 @@ import signedjson.sign from nacl.signing import SigningKey from signedjson.key import encode_verify_key_base64, get_verify_key -from twisted.internet import defer from twisted.internet.defer import Deferred, ensureDeferred from synapse.api.errors import SynapseError @@ -92,23 +92,23 @@ class KeyringTestCase(unittest.HomeserverTestCase): # deferred completes. first_lookup_deferred = Deferred() - async def first_lookup_fetch(keys_to_fetch): - self.assertEquals(current_context().request.id, "context_11") - self.assertEqual(keys_to_fetch, {"server10": {get_key_id(key1): 0}}) + async def first_lookup_fetch( + server_name: str, key_ids: List[str], minimum_valid_until_ts: int + ) -> Dict[str, FetchKeyResult]: + # self.assertEquals(current_context().request.id, "context_11") + self.assertEqual(server_name, "server10") + self.assertEqual(key_ids, [get_key_id(key1)]) + self.assertEqual(minimum_valid_until_ts, 0) await make_deferred_yieldable(first_lookup_deferred) - return { - "server10": { - get_key_id(key1): FetchKeyResult(get_verify_key(key1), 100) - } - } + return {get_key_id(key1): FetchKeyResult(get_verify_key(key1), 100)} mock_fetcher.get_keys.side_effect = first_lookup_fetch async def first_lookup(): with LoggingContext("context_11", request=FakeRequest("context_11")): res_deferreds = kr.verify_json_objects_for_server( - [("server10", json1, 0, "test10"), ("server11", {}, 0, "test11")] + [("server10", json1, 0), ("server11", {}, 0)] ) # the unsigned json should be rejected pretty quickly @@ -126,18 +126,18 @@ class KeyringTestCase(unittest.HomeserverTestCase): d0 = ensureDeferred(first_lookup()) + self.pump() + mock_fetcher.get_keys.assert_called_once() # a second request for a server with outstanding requests # should block rather than start a second call - async def second_lookup_fetch(keys_to_fetch): - self.assertEquals(current_context().request.id, "context_12") - return { - "server10": { - get_key_id(key1): FetchKeyResult(get_verify_key(key1), 100) - } - } + async def second_lookup_fetch( + server_name: str, key_ids: List[str], minimum_valid_until_ts: int + ) -> Dict[str, FetchKeyResult]: + # self.assertEquals(current_context().request.id, "context_12") + return {get_key_id(key1): FetchKeyResult(get_verify_key(key1), 100)} mock_fetcher.get_keys.reset_mock() mock_fetcher.get_keys.side_effect = second_lookup_fetch @@ -146,7 +146,13 @@ class KeyringTestCase(unittest.HomeserverTestCase): async def second_lookup(): with LoggingContext("context_12", request=FakeRequest("context_12")): res_deferreds_2 = kr.verify_json_objects_for_server( - [("server10", json1, 0, "test")] + [ + ( + "server10", + json1, + 0, + ) + ] ) res_deferreds_2[0].addBoth(self.check_context, None) second_lookup_state[0] = 1 @@ -183,11 +189,11 @@ class KeyringTestCase(unittest.HomeserverTestCase): signedjson.sign.sign_json(json1, "server9", key1) # should fail immediately on an unsigned object - d = _verify_json_for_server(kr, "server9", {}, 0, "test unsigned") + d = kr.verify_json_for_server("server9", {}, 0) self.get_failure(d, SynapseError) # should succeed on a signed object - d = _verify_json_for_server(kr, "server9", json1, 500, "test signed") + d = kr.verify_json_for_server("server9", json1, 500) # self.assertFalse(d.called) self.get_success(d) @@ -214,24 +220,24 @@ class KeyringTestCase(unittest.HomeserverTestCase): signedjson.sign.sign_json(json1, "server9", key1) # should fail immediately on an unsigned object - d = _verify_json_for_server(kr, "server9", {}, 0, "test unsigned") + d = kr.verify_json_for_server("server9", {}, 0) self.get_failure(d, SynapseError) # should fail on a signed object with a non-zero minimum_valid_until_ms, # as it tries to refetch the keys and fails. - d = _verify_json_for_server( - kr, "server9", json1, 500, "test signed non-zero min" - ) + d = kr.verify_json_for_server("server9", json1, 500) self.get_failure(d, SynapseError) # We expect the keyring tried to refetch the key once. mock_fetcher.get_keys.assert_called_once_with( - {"server9": {get_key_id(key1): 500}} + "server9", [get_key_id(key1)], 500 ) # should succeed on a signed object with a 0 minimum_valid_until_ms - d = _verify_json_for_server( - kr, "server9", json1, 0, "test signed with zero min" + d = kr.verify_json_for_server( + "server9", + json1, + 0, ) self.get_success(d) @@ -239,15 +245,15 @@ class KeyringTestCase(unittest.HomeserverTestCase): """Two requests for the same key should be deduped.""" key1 = signedjson.key.generate_signing_key(1) - async def get_keys(keys_to_fetch): + async def get_keys( + server_name: str, key_ids: List[str], minimum_valid_until_ts: int + ) -> Dict[str, FetchKeyResult]: # there should only be one request object (with the max validity) - self.assertEqual(keys_to_fetch, {"server1": {get_key_id(key1): 1500}}) + self.assertEqual(server_name, "server1") + self.assertEqual(key_ids, [get_key_id(key1)]) + self.assertEqual(minimum_valid_until_ts, 1500) - return { - "server1": { - get_key_id(key1): FetchKeyResult(get_verify_key(key1), 1200) - } - } + return {get_key_id(key1): FetchKeyResult(get_verify_key(key1), 1200)} mock_fetcher = Mock() mock_fetcher.get_keys = Mock(side_effect=get_keys) @@ -259,7 +265,14 @@ class KeyringTestCase(unittest.HomeserverTestCase): # the first request should succeed; the second should fail because the key # has expired results = kr.verify_json_objects_for_server( - [("server1", json1, 500, "test1"), ("server1", json1, 1500, "test2")] + [ + ( + "server1", + json1, + 500, + ), + ("server1", json1, 1500), + ] ) self.assertEqual(len(results), 2) self.get_success(results[0]) @@ -274,19 +287,21 @@ class KeyringTestCase(unittest.HomeserverTestCase): """If the first fetcher cannot provide a recent enough key, we fall back""" key1 = signedjson.key.generate_signing_key(1) - async def get_keys1(keys_to_fetch): - self.assertEqual(keys_to_fetch, {"server1": {get_key_id(key1): 1500}}) - return { - "server1": {get_key_id(key1): FetchKeyResult(get_verify_key(key1), 800)} - } - - async def get_keys2(keys_to_fetch): - self.assertEqual(keys_to_fetch, {"server1": {get_key_id(key1): 1500}}) - return { - "server1": { - get_key_id(key1): FetchKeyResult(get_verify_key(key1), 1200) - } - } + async def get_keys1( + server_name: str, key_ids: List[str], minimum_valid_until_ts: int + ) -> Dict[str, FetchKeyResult]: + self.assertEqual(server_name, "server1") + self.assertEqual(key_ids, [get_key_id(key1)]) + self.assertEqual(minimum_valid_until_ts, 1500) + return {get_key_id(key1): FetchKeyResult(get_verify_key(key1), 800)} + + async def get_keys2( + server_name: str, key_ids: List[str], minimum_valid_until_ts: int + ) -> Dict[str, FetchKeyResult]: + self.assertEqual(server_name, "server1") + self.assertEqual(key_ids, [get_key_id(key1)]) + self.assertEqual(minimum_valid_until_ts, 1500) + return {get_key_id(key1): FetchKeyResult(get_verify_key(key1), 1200)} mock_fetcher1 = Mock() mock_fetcher1.get_keys = Mock(side_effect=get_keys1) @@ -298,7 +313,18 @@ class KeyringTestCase(unittest.HomeserverTestCase): signedjson.sign.sign_json(json1, "server1", key1) results = kr.verify_json_objects_for_server( - [("server1", json1, 1200, "test1"), ("server1", json1, 1500, "test2")] + [ + ( + "server1", + json1, + 1200, + ), + ( + "server1", + json1, + 1500, + ), + ] ) self.assertEqual(len(results), 2) self.get_success(results[0]) @@ -349,9 +375,8 @@ class ServerKeyFetcherTestCase(unittest.HomeserverTestCase): self.http_client.get_json.side_effect = get_json - keys_to_fetch = {SERVER_NAME: {"key1": 0}} - keys = self.get_success(fetcher.get_keys(keys_to_fetch)) - k = keys[SERVER_NAME][testverifykey_id] + keys = self.get_success(fetcher.get_keys(SERVER_NAME, ["key1"], 0)) + k = keys[testverifykey_id] self.assertEqual(k.valid_until_ts, VALID_UNTIL_TS) self.assertEqual(k.verify_key, testverifykey) self.assertEqual(k.verify_key.alg, "ed25519") @@ -378,7 +403,7 @@ class ServerKeyFetcherTestCase(unittest.HomeserverTestCase): # change the server name: the result should be ignored response["server_name"] = "OTHER_SERVER" - keys = self.get_success(fetcher.get_keys(keys_to_fetch)) + keys = self.get_success(fetcher.get_keys(SERVER_NAME, ["key1"], 0)) self.assertEqual(keys, {}) @@ -465,10 +490,9 @@ class PerspectivesKeyFetcherTestCase(unittest.HomeserverTestCase): self.expect_outgoing_key_query(SERVER_NAME, "key1", response) - keys_to_fetch = {SERVER_NAME: {"key1": 0}} - keys = self.get_success(fetcher.get_keys(keys_to_fetch)) - self.assertIn(SERVER_NAME, keys) - k = keys[SERVER_NAME][testverifykey_id] + keys = self.get_success(fetcher.get_keys(SERVER_NAME, ["key1"], 0)) + self.assertIn(testverifykey_id, keys) + k = keys[testverifykey_id] self.assertEqual(k.valid_until_ts, VALID_UNTIL_TS) self.assertEqual(k.verify_key, testverifykey) self.assertEqual(k.verify_key.alg, "ed25519") @@ -515,10 +539,9 @@ class PerspectivesKeyFetcherTestCase(unittest.HomeserverTestCase): self.expect_outgoing_key_query(SERVER_NAME, "key1", response) - keys_to_fetch = {SERVER_NAME: {"key1": 0}} - keys = self.get_success(fetcher.get_keys(keys_to_fetch)) - self.assertIn(SERVER_NAME, keys) - k = keys[SERVER_NAME][testverifykey_id] + keys = self.get_success(fetcher.get_keys(SERVER_NAME, ["key1"], 0)) + self.assertIn(testverifykey_id, keys) + k = keys[testverifykey_id] self.assertEqual(k.valid_until_ts, VALID_UNTIL_TS) self.assertEqual(k.verify_key, testverifykey) self.assertEqual(k.verify_key.alg, "ed25519") @@ -559,14 +582,13 @@ class PerspectivesKeyFetcherTestCase(unittest.HomeserverTestCase): def get_key_from_perspectives(response): fetcher = PerspectivesKeyFetcher(self.hs) - keys_to_fetch = {SERVER_NAME: {"key1": 0}} self.expect_outgoing_key_query(SERVER_NAME, "key1", response) - return self.get_success(fetcher.get_keys(keys_to_fetch)) + return self.get_success(fetcher.get_keys(SERVER_NAME, ["key1"], 0)) # start with a valid response so we can check we are testing the right thing response = build_response() keys = get_key_from_perspectives(response) - k = keys[SERVER_NAME][testverifykey_id] + k = keys[testverifykey_id] self.assertEqual(k.verify_key, testverifykey) # remove the perspectives server's signature @@ -585,23 +607,3 @@ class PerspectivesKeyFetcherTestCase(unittest.HomeserverTestCase): def get_key_id(key): """Get the matrix ID tag for a given SigningKey or VerifyKey""" return "%s:%s" % (key.alg, key.version) - - -@defer.inlineCallbacks -def run_in_context(f, *args, **kwargs): - with LoggingContext("testctx"): - rv = yield f(*args, **kwargs) - return rv - - -def _verify_json_for_server(kr, *args): - """thin wrapper around verify_json_for_server which makes sure it is wrapped - with the patched defer.inlineCallbacks. - """ - - @defer.inlineCallbacks - def v(): - rv1 = yield kr.verify_json_for_server(*args) - return rv1 - - return run_in_context(v) diff --git a/tests/rest/key/v2/test_remote_key_resource.py b/tests/rest/key/v2/test_remote_key_resource.py index 3b275bc23b..a75c0ea3f0 100644 --- a/tests/rest/key/v2/test_remote_key_resource.py +++ b/tests/rest/key/v2/test_remote_key_resource.py @@ -208,10 +208,10 @@ class EndToEndPerspectivesTests(BaseRemoteKeyResourceTestCase): keyid = "ed25519:%s" % (testkey.version,) fetcher = PerspectivesKeyFetcher(self.hs2) - d = fetcher.get_keys({"targetserver": {keyid: 1000}}) + d = fetcher.get_keys("targetserver", [keyid], 1000) res = self.get_success(d) - self.assertIn("targetserver", res) - keyres = res["targetserver"][keyid] + self.assertIn(keyid, res) + keyres = res[keyid] assert isinstance(keyres, FetchKeyResult) self.assertEqual( signedjson.key.encode_verify_key_base64(keyres.verify_key), @@ -230,10 +230,10 @@ class EndToEndPerspectivesTests(BaseRemoteKeyResourceTestCase): keyid = "ed25519:%s" % (testkey.version,) fetcher = PerspectivesKeyFetcher(self.hs2) - d = fetcher.get_keys({self.hs.hostname: {keyid: 1000}}) + d = fetcher.get_keys(self.hs.hostname, [keyid], 1000) res = self.get_success(d) - self.assertIn(self.hs.hostname, res) - keyres = res[self.hs.hostname][keyid] + self.assertIn(keyid, res) + keyres = res[keyid] assert isinstance(keyres, FetchKeyResult) self.assertEqual( signedjson.key.encode_verify_key_base64(keyres.verify_key), @@ -247,10 +247,10 @@ class EndToEndPerspectivesTests(BaseRemoteKeyResourceTestCase): keyid = "ed25519:%s" % (self.hs_signing_key.version,) fetcher = PerspectivesKeyFetcher(self.hs2) - d = fetcher.get_keys({self.hs.hostname: {keyid: 1000}}) + d = fetcher.get_keys(self.hs.hostname, [keyid], 1000) res = self.get_success(d) - self.assertIn(self.hs.hostname, res) - keyres = res[self.hs.hostname][keyid] + self.assertIn(keyid, res) + keyres = res[keyid] assert isinstance(keyres, FetchKeyResult) self.assertEqual( signedjson.key.encode_verify_key_base64(keyres.verify_key), diff --git a/tests/util/test_batching_queue.py b/tests/util/test_batching_queue.py index edf29e5b96..07be57d72c 100644 --- a/tests/util/test_batching_queue.py +++ b/tests/util/test_batching_queue.py @@ -45,37 +45,32 @@ class BatchingQueueTestCase(TestCase): self._pending_calls.append((values, d)) return await make_deferred_yieldable(d) + def _get_sample_with_name(self, metric, name) -> int: + """For a prometheus metric get the value of the sample that has a + matching "name" label. + """ + for sample in metric.collect()[0].samples: + if sample.labels.get("name") == name: + return sample.value + + self.fail("Found no matching sample") + def _assert_metrics(self, queued, keys, in_flight): """Assert that the metrics are correct""" - self.assertEqual(len(number_queued.collect()), 1) - self.assertEqual(len(number_queued.collect()[0].samples), 1) + sample = self._get_sample_with_name(number_queued, self.queue._name) self.assertEqual( - number_queued.collect()[0].samples[0].labels, - {"name": self.queue._name}, - ) - self.assertEqual( - number_queued.collect()[0].samples[0].value, + sample, queued, "number_queued", ) - self.assertEqual(len(number_of_keys.collect()), 1) - self.assertEqual(len(number_of_keys.collect()[0].samples), 1) - self.assertEqual( - number_queued.collect()[0].samples[0].labels, {"name": self.queue._name} - ) - self.assertEqual( - number_of_keys.collect()[0].samples[0].value, keys, "number_of_keys" - ) + sample = self._get_sample_with_name(number_of_keys, self.queue._name) + self.assertEqual(sample, keys, "number_of_keys") - self.assertEqual(len(number_in_flight.collect()), 1) - self.assertEqual(len(number_in_flight.collect()[0].samples), 1) - self.assertEqual( - number_queued.collect()[0].samples[0].labels, {"name": self.queue._name} - ) + sample = self._get_sample_with_name(number_in_flight, self.queue._name) self.assertEqual( - number_in_flight.collect()[0].samples[0].value, + sample, in_flight, "number_in_flight", ) |