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Rewrite the KeyRing (#10035)

This commit is contained in:
Erik Johnston 2021-06-02 16:37:59 +01:00 committed by GitHub
parent 3cf6b34b4e
commit fc3d2dc269
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GPG Key ID: 4AEE18F83AFDEB23
8 changed files with 403 additions and 502 deletions
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changelog.d/10035.feature Normal file
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@ -0,0 +1 @@
Rewrite logic around verifying JSON object and fetching server keys to be more performant and use less memory.

664
synapse/crypto/keyring.py
View File

@ -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(
return [
run_in_background(
self.process_request,
VerifyJsonRequest.from_json_object(
server_name, json_object, validity_time, request_name
)
for server_name, json_object, validity_time, request_name in server_and_json
server_name,
json_object,
validity_time,
),
)
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)
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.
"""
# 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,
)
# 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
for verify_request in verify_requests:
verify_request.key_ready.addBoth(lookup_done, verify_request)
# Actually start fetching keys.
self._get_server_verify_keys(verify_requests)
except Exception:
logger.exception("Error starting key lookups")
async def wait_for_previous_lookups(self, server_names: Iterable[str]) -> None:
"""Waits for any previous key lookups for the given servers to finish.
Args:
server_names: list of servers which we want to look up
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,
)
with PreserveLoggingContext():
await defer.DeferredList((w[1] for w in wait_on))
loop_count += 1
def _get_server_verify_keys(self, verify_requests: List[VerifyJsonRequest]) -> None:
"""Tries to find at least one key for each verify request
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.
Args:
verify_requests: list of verify requests
"""
remaining_requests = {rq for rq in verify_requests if not rq.key_ready.called}
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,
return [
run_in_background(
self.process_request,
VerifyJsonRequest.from_event(
server_name,
event,
validity_time,
),
)
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)
for server_name, event, validity_time in server_and_events
]
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
Args:
fetcher: fetcher to use to fetch the keys
remaining_requests: outstanding key requests.
Any successfully-completed requests will be removed from the list.
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.
"""
# 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]
if not verify_request.key_ids:
raise SynapseError(
400,
f"Not signed by {verify_request.server_name}",
Codes.UNAUTHORIZED,
)
# 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
)
# 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, {})
# 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:
# 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),
key_result = found_keys.get(key_id)
if not key_result:
continue
if key_result.valid_until_ts < verify_request.minimum_valid_until_ts:
continue
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,
)
if not verified:
raise SynapseError(
401,
f"Failed to find any key to satisfy: {key_request}",
Codes.UNAUTHORIZED,
)
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,
)
# 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
return to_return
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)
found_keys: Dict[str, FetchKeyResult] = {}
missing_key_ids = set(verify_request.key_ids)
for fetcher in self._key_fetchers:
if not missing_key_ids:
break
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)
completed = []
for verify_request in remaining_requests:
server_name = verify_request.server_name
# 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
for key_id, key in keys.items():
if not key:
continue
if (
fetch_key_result.valid_until_ts
< verify_request.minimum_valid_until_ts
):
# key was not valid at this point
# 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
# 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.
# 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.
#
# (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
# We still keep looking for the key from other fetchers in that
# case though.
found_keys[key_id] = key
remaining_requests.difference_update(completed)
if key.valid_until_ts < verify_request.minimum_valid_until_ts:
continue
missing_key_ids.discard(key_id)
return found_keys
class KeyFetcher(metaclass=abc.ABCMeta):
@abc.abstractmethod
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
def __init__(self, hs: "HomeServer"):
self._queue = BatchingQueue(
self.__class__.__name__, hs.get_clock(), self._fetch_keys
)
Returns:
Map from server_name -> key_id -> FetchKeyResult
"""
raise NotImplementedError
async def get_keys(
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, {})
@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"):
super().__init__(hs)
self.store = hs.get_datastore()
async def get_keys(
self, keys_to_fetch: Dict[str, Dict[str, int]]
) -> Dict[str, Dict[str, FetchKeyResult]]:
"""see KeyFetcher.get_keys"""
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 server_name, server_keys in keys_to_fetch.items()
for key_id in queue_value.key_ids
}
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,
)

4
synapse/federation/transport/server.py
View File

@ -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)

4
synapse/groups/attestations.py
View File

@ -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:

9
synapse/rest/key/v2/remote_key_resource.py
View File

@ -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 = []

168
tests/crypto/test_keyring.py
View File

@ -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_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(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_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)

18
tests/rest/key/v2/test_remote_key_resource.py
View File

@ -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),

37
tests/util/test_batching_queue.py
View File

@ -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)
sample = self._get_sample_with_name(number_in_flight, self.queue._name)
self.assertEqual(
number_queued.collect()[0].samples[0].labels, {"name": self.queue._name}
)
self.assertEqual(
number_in_flight.collect()[0].samples[0].value,
sample,
in_flight,
"number_in_flight",
)