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Merge pull request #5727 from matrix-org/uhoreg/e2e_cross-signing2-part3

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Cross-signing [4/4] -- federation edition
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Hubert Chathi 2019-10-31 23:59:35 -04:00 committed by GitHub
commit 53d7680e32
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7 changed files with 241 additions and 47 deletions
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1
changelog.d/5727.feature Normal file
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@ -0,0 +1 @@
Add federation support for cross-signing.

8
synapse/federation/sender/per_destination_queue.py
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@ -360,20 +360,20 @@ class PerDestinationQueue(object):
last_device_list = self._last_device_list_stream_id
# Retrieve list of new device updates to send to the destination
now_stream_id, results = yield self._store.get_devices_by_remote(
now_stream_id, results = yield self._store.get_device_updates_by_remote(
self._destination, last_device_list, limit=limit
)
edus = [
Edu(
origin=self._server_name,
destination=self._destination,
edu_type="m.device_list_update",
edu_type=edu_type,
content=content,
)
for content in results
for (edu_type, content) in results
]
assert len(edus) <= limit, "get_devices_by_remote returned too many EDUs"
assert len(edus) <= limit, "get_device_updates_by_remote returned too many EDUs"
return (edus, now_stream_id)

13
synapse/handlers/device.py
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@ -459,7 +459,18 @@ class DeviceHandler(DeviceWorkerHandler):
@defer.inlineCallbacks
def on_federation_query_user_devices(self, user_id):
stream_id, devices = yield self.store.get_devices_with_keys_by_user(user_id)
return {"user_id": user_id, "stream_id": stream_id, "devices": devices}
master_key = yield self.store.get_e2e_cross_signing_key(user_id, "master")
self_signing_key = yield self.store.get_e2e_cross_signing_key(
user_id, "self_signing"
)
return {
"user_id": user_id,
"stream_id": stream_id,
"devices": devices,
"master_key": master_key,
"self_signing_key": self_signing_key,
}
@defer.inlineCallbacks
def user_left_room(self, user, room_id):

137
synapse/handlers/e2e_keys.py
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@ -36,6 +36,8 @@ from synapse.types import (
get_verify_key_from_cross_signing_key,
)
from synapse.util import unwrapFirstError
from synapse.util.async_helpers import Linearizer
from synapse.util.caches.expiringcache import ExpiringCache
from synapse.util.retryutils import NotRetryingDestination
logger = logging.getLogger(__name__)
@ -49,10 +51,19 @@ class E2eKeysHandler(object):
self.is_mine = hs.is_mine
self.clock = hs.get_clock()
self._edu_updater = SigningKeyEduUpdater(hs, self)
federation_registry = hs.get_federation_registry()
# FIXME: switch to m.signing_key_update when MSC1756 is merged into the spec
federation_registry.register_edu_handler(
"org.matrix.signing_key_update",
self._edu_updater.incoming_signing_key_update,
)
# doesn't really work as part of the generic query API, because the
# query request requires an object POST, but we abuse the
# "query handler" interface.
hs.get_federation_registry().register_query_handler(
federation_registry.register_query_handler(
"client_keys", self.on_federation_query_client_keys
)
@ -208,13 +219,15 @@ class E2eKeysHandler(object):
if user_id in destination_query:
results[user_id] = keys
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 "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
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
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)
@ -252,7 +265,7 @@ class E2eKeysHandler(object):
Returns:
defer.Deferred[dict[str, dict[str, dict]]]: map from
(master|self_signing|user_signing) -> user_id -> key
(master_keys|self_signing_keys|user_signing_keys) -> user_id -> key
"""
master_keys = {}
self_signing_keys = {}
@ -344,7 +357,16 @@ class E2eKeysHandler(object):
"""
device_keys_query = query_body.get("device_keys", {})
res = yield self.query_local_devices(device_keys_query)
return {"device_keys": res}
ret = {"device_keys": res}
# add in the cross-signing keys
cross_signing_keys = yield self.get_cross_signing_keys_from_cache(
device_keys_query, None
)
ret.update(cross_signing_keys)
return ret
@trace
@defer.inlineCallbacks
@ -1058,3 +1080,100 @@ class SignatureListItem:
target_user_id = attr.ib()
target_device_id = attr.ib()
signature = attr.ib()
class SigningKeyEduUpdater(object):
"""Handles incoming signing key updates from federation and updates the DB"""
def __init__(self, hs, e2e_keys_handler):
self.store = hs.get_datastore()
self.federation = hs.get_federation_client()
self.clock = hs.get_clock()
self.e2e_keys_handler = e2e_keys_handler
self._remote_edu_linearizer = Linearizer(name="remote_signing_key")
# user_id -> list of updates waiting to be handled.
self._pending_updates = {}
# Recently seen stream ids. We don't bother keeping these in the DB,
# but they're useful to have them about to reduce the number of spurious
# resyncs.
self._seen_updates = ExpiringCache(
cache_name="signing_key_update_edu",
clock=self.clock,
max_len=10000,
expiry_ms=30 * 60 * 1000,
iterable=True,
)
@defer.inlineCallbacks
def incoming_signing_key_update(self, origin, edu_content):
"""Called on incoming signing key update from federation. Responsible for
parsing the EDU and adding to pending updates list.
Args:
origin (string): the server that sent the EDU
edu_content (dict): the contents of the EDU
"""
user_id = edu_content.pop("user_id")
master_key = edu_content.pop("master_key", None)
self_signing_key = edu_content.pop("self_signing_key", None)
if get_domain_from_id(user_id) != origin:
logger.warning("Got signing key update edu for %r from %r", user_id, origin)
return
room_ids = yield self.store.get_rooms_for_user(user_id)
if not room_ids:
# We don't share any rooms with this user. Ignore update, as we
# probably won't get any further updates.
return
self._pending_updates.setdefault(user_id, []).append(
(master_key, self_signing_key)
)
yield self._handle_signing_key_updates(user_id)
@defer.inlineCallbacks
def _handle_signing_key_updates(self, user_id):
"""Actually handle pending updates.
Args:
user_id (string): the user whose updates we are processing
"""
device_handler = self.e2e_keys_handler.device_handler
with (yield self._remote_edu_linearizer.queue(user_id)):
pending_updates = self._pending_updates.pop(user_id, [])
if not pending_updates:
# This can happen since we batch updates
return
device_ids = []
logger.info("pending updates: %r", pending_updates)
for master_key, self_signing_key in pending_updates:
if master_key:
yield self.store.set_e2e_cross_signing_key(
user_id, "master", master_key
)
_, verify_key = get_verify_key_from_cross_signing_key(master_key)
# verify_key is a VerifyKey from signedjson, which uses
# .version to denote the portion of the key ID after the
# algorithm and colon, which is the device ID
device_ids.append(verify_key.version)
if self_signing_key:
yield self.store.set_e2e_cross_signing_key(
user_id, "self_signing", self_signing_key
)
_, verify_key = get_verify_key_from_cross_signing_key(
self_signing_key
)
device_ids.append(verify_key.version)
yield device_handler.notify_device_update(user_id, device_ids)

109
synapse/storage/data_stores/main/devices.py
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@ -37,6 +37,7 @@ from synapse.storage._base import (
make_in_list_sql_clause,
)
from synapse.storage.background_updates import BackgroundUpdateStore
from synapse.types import get_verify_key_from_cross_signing_key
from synapse.util import batch_iter
from synapse.util.caches.descriptors import cached, cachedInlineCallbacks, cachedList
@ -90,13 +91,18 @@ class DeviceWorkerStore(SQLBaseStore):
@trace
@defer.inlineCallbacks
def get_devices_by_remote(self, destination, from_stream_id, limit):
"""Get stream of updates to send to remote servers
def get_device_updates_by_remote(self, destination, from_stream_id, limit):
"""Get a stream of device updates to send to the given remote server.
Args:
destination (str): The host the device updates are intended for
from_stream_id (int): The minimum stream_id to filter updates by, exclusive
limit (int): Maximum number of device updates to return
Returns:
Deferred[tuple[int, list[dict]]]:
Deferred[tuple[int, list[tuple[string,dict]]]]:
current stream id (ie, the stream id of the last update included in the
response), and the list of updates
response), and the list of updates, where each update is a pair of EDU
type and EDU contents
"""
now_stream_id = self._device_list_id_gen.get_current_token()
@ -117,8 +123,8 @@ class DeviceWorkerStore(SQLBaseStore):
# stream_id; the rationale being that such a large device list update
# is likely an error.
updates = yield self.runInteraction(
"get_devices_by_remote",
self._get_devices_by_remote_txn,
"get_device_updates_by_remote",
self._get_device_updates_by_remote_txn,
destination,
from_stream_id,
now_stream_id,
@ -129,6 +135,37 @@ class DeviceWorkerStore(SQLBaseStore):
if not updates:
return now_stream_id, []
# get the cross-signing keys of the users in the list, so that we can
# determine which of the device changes were cross-signing keys
users = set(r[0] for r in updates)
master_key_by_user = {}
self_signing_key_by_user = {}
for user in users:
cross_signing_key = yield self.get_e2e_cross_signing_key(user, "master")
if cross_signing_key:
key_id, verify_key = get_verify_key_from_cross_signing_key(
cross_signing_key
)
# verify_key is a VerifyKey from signedjson, which uses
# .version to denote the portion of the key ID after the
# algorithm and colon, which is the device ID
master_key_by_user[user] = {
"key_info": cross_signing_key,
"device_id": verify_key.version,
}
cross_signing_key = yield self.get_e2e_cross_signing_key(
user, "self_signing"
)
if cross_signing_key:
key_id, verify_key = get_verify_key_from_cross_signing_key(
cross_signing_key
)
self_signing_key_by_user[user] = {
"key_info": cross_signing_key,
"device_id": verify_key.version,
}
# if we have exceeded the limit, we need to exclude any results with the
# same stream_id as the last row.
if len(updates) > limit:
@ -153,20 +190,33 @@ class DeviceWorkerStore(SQLBaseStore):
# context which created the Edu.
query_map = {}
for update in updates:
if stream_id_cutoff is not None and update[2] >= stream_id_cutoff:
cross_signing_keys_by_user = {}
for user_id, device_id, update_stream_id, update_context in updates:
if stream_id_cutoff is not None and update_stream_id >= stream_id_cutoff:
# Stop processing updates
break
key = (update[0], update[1])
if (
user_id in master_key_by_user
and device_id == master_key_by_user[user_id]["device_id"]
):
result = cross_signing_keys_by_user.setdefault(user_id, {})
result["master_key"] = master_key_by_user[user_id]["key_info"]
elif (
user_id in self_signing_key_by_user
and device_id == self_signing_key_by_user[user_id]["device_id"]
):
result = cross_signing_keys_by_user.setdefault(user_id, {})
result["self_signing_key"] = self_signing_key_by_user[user_id][
"key_info"
]
else:
key = (user_id, device_id)
update_context = update[3]
update_stream_id = update[2]
previous_update_stream_id, _ = query_map.get(key, (0, None))
previous_update_stream_id, _ = query_map.get(key, (0, None))
if update_stream_id > previous_update_stream_id:
query_map[key] = (update_stream_id, update_context)
if update_stream_id > previous_update_stream_id:
query_map[key] = (update_stream_id, update_context)
# If we didn't find any updates with a stream_id lower than the cutoff, it
# means that there are more than limit updates all of which have the same
@ -176,16 +226,22 @@ class DeviceWorkerStore(SQLBaseStore):
# devices, in which case E2E isn't going to work well anyway. We'll just
# skip that stream_id and return an empty list, and continue with the next
# stream_id next time.
if not query_map:
if not query_map and not cross_signing_keys_by_user:
return stream_id_cutoff, []
results = yield self._get_device_update_edus_by_remote(
destination, from_stream_id, query_map
)
# add the updated cross-signing keys to the results list
for user_id, result in iteritems(cross_signing_keys_by_user):
result["user_id"] = user_id
# FIXME: switch to m.signing_key_update when MSC1756 is merged into the spec
results.append(("org.matrix.signing_key_update", result))
return now_stream_id, results
def _get_devices_by_remote_txn(
def _get_device_updates_by_remote_txn(
self, txn, destination, from_stream_id, now_stream_id, limit
):
"""Return device update information for a given remote destination
@ -200,6 +256,7 @@ class DeviceWorkerStore(SQLBaseStore):
Returns:
List: List of device updates
"""
# get the list of device updates that need to be sent
sql = """
SELECT user_id, device_id, stream_id, opentracing_context FROM device_lists_outbound_pokes
WHERE destination = ? AND ? < stream_id AND stream_id <= ? AND sent = ?
@ -225,12 +282,16 @@ class DeviceWorkerStore(SQLBaseStore):
List[Dict]: List of objects representing an device update EDU
"""
devices = yield self.runInteraction(
"_get_e2e_device_keys_txn",
self._get_e2e_device_keys_txn,
query_map.keys(),
include_all_devices=True,
include_deleted_devices=True,
devices = (
yield self.runInteraction(
"_get_e2e_device_keys_txn",
self._get_e2e_device_keys_txn,
query_map.keys(),
include_all_devices=True,
include_deleted_devices=True,
)
if query_map
else {}
)
results = []
@ -262,7 +323,7 @@ class DeviceWorkerStore(SQLBaseStore):
else:
result["deleted"] = True
results.append(result)
results.append(("m.device_list_update", result))
return results

4
tests/handlers/test_typing.py
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@ -73,7 +73,7 @@ class TypingNotificationsTestCase(unittest.HomeserverTestCase):
"get_received_txn_response",
"set_received_txn_response",
"get_destination_retry_timings",
"get_devices_by_remote",
"get_device_updates_by_remote",
# Bits that user_directory needs
"get_user_directory_stream_pos",
"get_current_state_deltas",
@ -109,7 +109,7 @@ class TypingNotificationsTestCase(unittest.HomeserverTestCase):
retry_timings_res
)
self.datastore.get_devices_by_remote.return_value = (0, [])
self.datastore.get_device_updates_by_remote.return_value = (0, [])
def get_received_txn_response(*args):
return defer.succeed(None)

16
tests/storage/test_devices.py
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@ -72,7 +72,7 @@ class DeviceStoreTestCase(tests.unittest.TestCase):
)
@defer.inlineCallbacks
def test_get_devices_by_remote(self):
def test_get_device_updates_by_remote(self):
device_ids = ["device_id1", "device_id2"]
# Add two device updates with a single stream_id
@ -81,7 +81,7 @@ class DeviceStoreTestCase(tests.unittest.TestCase):
)
# Get all device updates ever meant for this remote
now_stream_id, device_updates = yield self.store.get_devices_by_remote(
now_stream_id, device_updates = yield self.store.get_device_updates_by_remote(
"somehost", -1, limit=100
)
@ -89,7 +89,7 @@ class DeviceStoreTestCase(tests.unittest.TestCase):
self._check_devices_in_updates(device_ids, device_updates)
@defer.inlineCallbacks
def test_get_devices_by_remote_limited(self):
def test_get_device_updates_by_remote_limited(self):
# Test breaking the update limit in 1, 101, and 1 device_id segments
# first add one device
@ -115,20 +115,20 @@ class DeviceStoreTestCase(tests.unittest.TestCase):
#
# first we should get a single update
now_stream_id, device_updates = yield self.store.get_devices_by_remote(
now_stream_id, device_updates = yield self.store.get_device_updates_by_remote(
"someotherhost", -1, limit=100
)
self._check_devices_in_updates(device_ids1, device_updates)
# Then we should get an empty list back as the 101 devices broke the limit
now_stream_id, device_updates = yield self.store.get_devices_by_remote(
now_stream_id, device_updates = yield self.store.get_device_updates_by_remote(
"someotherhost", now_stream_id, limit=100
)
self.assertEqual(len(device_updates), 0)
# The 101 devices should've been cleared, so we should now just get one device
# update
now_stream_id, device_updates = yield self.store.get_devices_by_remote(
now_stream_id, device_updates = yield self.store.get_device_updates_by_remote(
"someotherhost", now_stream_id, limit=100
)
self._check_devices_in_updates(device_ids3, device_updates)
@ -137,7 +137,9 @@ class DeviceStoreTestCase(tests.unittest.TestCase):
"""Check that an specific device ids exist in a list of device update EDUs"""
self.assertEqual(len(device_updates), len(expected_device_ids))
received_device_ids = {update["device_id"] for update in device_updates}
received_device_ids = {
update["device_id"] for edu_type, update in device_updates
}
self.assertEqual(received_device_ids, set(expected_device_ids))
@defer.inlineCallbacks