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Include cross-signing signatures when syncing remote devices for the first time (#11234)

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When fetching remote devices for the first time, we did not correctly include the cross signing keys in the returned results.

c.f. #11159
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Erik Johnston 2021-11-09 11:45:36 +00:00 committed by GitHub
parent 820337e6a4
commit af784644c3
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3 changed files with 277 additions and 86 deletions
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1
changelog.d/11234.bugfix Normal file
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@ -0,0 +1 @@
Fix long-standing bug where cross signing keys were not included in the response to `/r0/keys/query` the first time a remote user was queried.

211
synapse/handlers/e2e_keys.py
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@ -201,95 +201,19 @@ class E2eKeysHandler:
r[user_id] = remote_queries[user_id]
# Now fetch any devices that we don't have in our cache
@trace
async def do_remote_query(destination: str) -> None:
"""This is called when we are querying the device list of a user on
a remote homeserver and their device list is not in the device list
cache. If we share a room with this user and we're not querying for
specific user we will update the cache with their device list.
"""
destination_query = remote_queries_not_in_cache[destination]
# We first consider whether we wish to update the device list cache with
# the users device list. We want to track a user's devices when the
# authenticated user shares a room with the queried user and the query
# has not specified a particular device.
# If we update the cache for the queried user we remove them from further
# queries. We use the more efficient batched query_client_keys for all
# remaining users
user_ids_updated = []
for (user_id, device_list) in destination_query.items():
if user_id in user_ids_updated:
continue
if device_list:
continue
room_ids = await self.store.get_rooms_for_user(user_id)
if not room_ids:
continue
# We've decided we're sharing a room with this user and should
# probably be tracking their device lists. However, we haven't
# done an initial sync on the device list so we do it now.
try:
if self._is_master:
user_devices = await self.device_handler.device_list_updater.user_device_resync(
user_id
)
else:
user_devices = await self._user_device_resync_client(
user_id=user_id
)
user_devices = user_devices["devices"]
user_results = results.setdefault(user_id, {})
for device in user_devices:
user_results[device["device_id"]] = device["keys"]
user_ids_updated.append(user_id)
except Exception as e:
failures[destination] = _exception_to_failure(e)
if len(destination_query) == len(user_ids_updated):
# We've updated all the users in the query and we do not need to
# make any further remote calls.
return
# Remove all the users from the query which we have updated
for user_id in user_ids_updated:
destination_query.pop(user_id)
try:
remote_result = await self.federation.query_client_keys(
destination, {"device_keys": destination_query}, timeout=timeout
)
for user_id, keys in remote_result["device_keys"].items():
if user_id in destination_query:
results[user_id] = keys
if "master_keys" in remote_result:
for user_id, key in remote_result["master_keys"].items():
if user_id in destination_query:
cross_signing_keys["master_keys"][user_id] = key
if "self_signing_keys" in remote_result:
for user_id, key in remote_result["self_signing_keys"].items():
if user_id in destination_query:
cross_signing_keys["self_signing_keys"][user_id] = key
except Exception as e:
failure = _exception_to_failure(e)
failures[destination] = failure
set_tag("error", True)
set_tag("reason", failure)
await make_deferred_yieldable(
defer.gatherResults(
[
run_in_background(do_remote_query, destination)
for destination in remote_queries_not_in_cache
run_in_background(
self._query_devices_for_destination,
results,
cross_signing_keys,
failures,
destination,
queries,
timeout,
)
for destination, queries in remote_queries_not_in_cache.items()
],
consumeErrors=True,
).addErrback(unwrapFirstError)
@ -301,6 +225,121 @@ class E2eKeysHandler:
return ret
@trace
async def _query_devices_for_destination(
self,
results: JsonDict,
cross_signing_keys: JsonDict,
failures: Dict[str, JsonDict],
destination: str,
destination_query: Dict[str, Iterable[str]],
timeout: int,
) -> None:
"""This is called when we are querying the device list of a user on
a remote homeserver and their device list is not in the device list
cache. If we share a room with this user and we're not querying for
specific user we will update the cache with their device list.
Args:
results: A map from user ID to their device keys, which gets
updated with the newly fetched keys.
cross_signing_keys: Map from user ID to their cross signing keys,
which gets updated with the newly fetched keys.
failures: Map of destinations to failures that have occurred while
attempting to fetch keys.
destination: The remote server to query
destination_query: The query dict of devices to query the remote
server for.
timeout: The timeout for remote HTTP requests.
"""
# We first consider whether we wish to update the device list cache with
# the users device list. We want to track a user's devices when the
# authenticated user shares a room with the queried user and the query
# has not specified a particular device.
# If we update the cache for the queried user we remove them from further
# queries. We use the more efficient batched query_client_keys for all
# remaining users
user_ids_updated = []
for (user_id, device_list) in destination_query.items():
if user_id in user_ids_updated:
continue
if device_list:
continue
room_ids = await self.store.get_rooms_for_user(user_id)
if not room_ids:
continue
# We've decided we're sharing a room with this user and should
# probably be tracking their device lists. However, we haven't
# done an initial sync on the device list so we do it now.
try:
if self._is_master:
resync_results = await self.device_handler.device_list_updater.user_device_resync(
user_id
)
else:
resync_results = await self._user_device_resync_client(
user_id=user_id
)
# Add the device keys to the results.
user_devices = resync_results["devices"]
user_results = results.setdefault(user_id, {})
for device in user_devices:
user_results[device["device_id"]] = device["keys"]
user_ids_updated.append(user_id)
# Add any cross signing keys to the results.
master_key = resync_results.get("master_key")
self_signing_key = resync_results.get("self_signing_key")
if master_key:
cross_signing_keys["master_keys"][user_id] = master_key
if self_signing_key:
cross_signing_keys["self_signing_keys"][user_id] = self_signing_key
except Exception as e:
failures[destination] = _exception_to_failure(e)
if len(destination_query) == len(user_ids_updated):
# We've updated all the users in the query and we do not need to
# make any further remote calls.
return
# Remove all the users from the query which we have updated
for user_id in user_ids_updated:
destination_query.pop(user_id)
try:
remote_result = await self.federation.query_client_keys(
destination, {"device_keys": destination_query}, timeout=timeout
)
for user_id, keys in remote_result["device_keys"].items():
if user_id in destination_query:
results[user_id] = keys
if "master_keys" in remote_result:
for user_id, key in remote_result["master_keys"].items():
if user_id in destination_query:
cross_signing_keys["master_keys"][user_id] = key
if "self_signing_keys" in remote_result:
for user_id, key in remote_result["self_signing_keys"].items():
if user_id in destination_query:
cross_signing_keys["self_signing_keys"][user_id] = key
except Exception as e:
failure = _exception_to_failure(e)
failures[destination] = failure
set_tag("error", True)
set_tag("reason", failure)
return
async def get_cross_signing_keys_from_cache(
self, query: Iterable[str], from_user_id: Optional[str]
) -> Dict[str, Dict[str, dict]]:

151
tests/handlers/test_e2e_keys.py
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@ -17,6 +17,8 @@ from unittest import mock
from signedjson import key as key, sign as sign
from twisted.internet import defer
from synapse.api.constants import RoomEncryptionAlgorithms
from synapse.api.errors import Codes, SynapseError
@ -630,3 +632,152 @@ class E2eKeysHandlerTestCase(unittest.HomeserverTestCase):
],
other_master_key["signatures"][local_user]["ed25519:" + usersigning_pubkey],
)
def test_query_devices_remote_no_sync(self):
"""Tests that querying keys for a remote user that we don't share a room
with returns the cross signing keys correctly.
"""
remote_user_id = "@test:other"
local_user_id = "@test:test"
remote_master_key = "85T7JXPFBAySB/jwby4S3lBPTqY3+Zg53nYuGmu1ggY"
remote_self_signing_key = "QeIiFEjluPBtI7WQdG365QKZcFs9kqmHir6RBD0//nQ"
self.hs.get_federation_client().query_client_keys = mock.Mock(
return_value=defer.succeed(
{
"device_keys": {remote_user_id: {}},
"master_keys": {
remote_user_id: {
"user_id": remote_user_id,
"usage": ["master"],
"keys": {"ed25519:" + remote_master_key: remote_master_key},
},
},
"self_signing_keys": {
remote_user_id: {
"user_id": remote_user_id,
"usage": ["self_signing"],
"keys": {
"ed25519:"
+ remote_self_signing_key: remote_self_signing_key
},
}
},
}
)
)
e2e_handler = self.hs.get_e2e_keys_handler()
query_result = self.get_success(
e2e_handler.query_devices(
{
"device_keys": {remote_user_id: []},
},
timeout=10,
from_user_id=local_user_id,
from_device_id="some_device_id",
)
)
self.assertEqual(query_result["failures"], {})
self.assertEqual(
query_result["master_keys"],
{
remote_user_id: {
"user_id": remote_user_id,
"usage": ["master"],
"keys": {"ed25519:" + remote_master_key: remote_master_key},
},
},
)
self.assertEqual(
query_result["self_signing_keys"],
{
remote_user_id: {
"user_id": remote_user_id,
"usage": ["self_signing"],
"keys": {
"ed25519:" + remote_self_signing_key: remote_self_signing_key
},
}
},
)
def test_query_devices_remote_sync(self):
"""Tests that querying keys for a remote user that we share a room with,
but haven't yet fetched the keys for, returns the cross signing keys
correctly.
"""
remote_user_id = "@test:other"
local_user_id = "@test:test"
self.store.get_rooms_for_user = mock.Mock(
return_value=defer.succeed({"some_room_id"})
)
remote_master_key = "85T7JXPFBAySB/jwby4S3lBPTqY3+Zg53nYuGmu1ggY"
remote_self_signing_key = "QeIiFEjluPBtI7WQdG365QKZcFs9kqmHir6RBD0//nQ"
self.hs.get_federation_client().query_user_devices = mock.Mock(
return_value=defer.succeed(
{
"user_id": remote_user_id,
"stream_id": 1,
"devices": [],
"master_key": {
"user_id": remote_user_id,
"usage": ["master"],
"keys": {"ed25519:" + remote_master_key: remote_master_key},
},
"self_signing_key": {
"user_id": remote_user_id,
"usage": ["self_signing"],
"keys": {
"ed25519:"
+ remote_self_signing_key: remote_self_signing_key
},
},
}
)
)
e2e_handler = self.hs.get_e2e_keys_handler()
query_result = self.get_success(
e2e_handler.query_devices(
{
"device_keys": {remote_user_id: []},
},
timeout=10,
from_user_id=local_user_id,
from_device_id="some_device_id",
)
)
self.assertEqual(query_result["failures"], {})
self.assertEqual(
query_result["master_keys"],
{
remote_user_id: {
"user_id": remote_user_id,
"usage": ["master"],
"keys": {"ed25519:" + remote_master_key: remote_master_key},
}
},
)
self.assertEqual(
query_result["self_signing_keys"],
{
remote_user_id: {
"user_id": remote_user_id,
"usage": ["self_signing"],
"keys": {
"ed25519:" + remote_self_signing_key: remote_self_signing_key
},
}
},
)