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sanity-checking for events used in state res (#6531)

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When we perform state resolution, check that all of the events involved are in
the right room.
This commit is contained in:
Richard van der Hoff 2019-12-13 12:55:32 +00:00 committed by GitHub
parent 971a0702b5
commit 1da15f05f5
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6 changed files with 128 additions and 43 deletions
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1
changelog.d/6531.misc Normal file
View file

@ -0,0 +1 @@
Improve sanity-checking when receiving events over federation.

1
synapse/handlers/federation.py
View file

@ -396,6 +396,7 @@ class FederationHandler(BaseHandler):
event_map[x.event_id] = x
state_map = await resolve_events_with_store(
room_id,
room_version,
state_maps,
event_map,

32
synapse/state/__init__.py
View file

@ -16,7 +16,7 @@
import logging
from collections import namedtuple
from typing import Iterable, Optional
from typing import Dict, Iterable, List, Optional, Tuple
from six import iteritems, itervalues
@ -417,6 +417,7 @@ class StateHandler(object):
with Measure(self.clock, "state._resolve_events"):
new_state = yield resolve_events_with_store(
event.room_id,
room_version,
state_set_ids,
event_map=state_map,
@ -462,7 +463,7 @@ class StateResolutionHandler(object):
not be called for a single state group
Args:
room_id (str): room we are resolving for (used for logging)
room_id (str): room we are resolving for (used for logging and sanity checks)
room_version (str): version of the room
state_groups_ids (dict[int, dict[(str, str), str]]):
map from state group id to the state in that state group
@ -518,6 +519,7 @@ class StateResolutionHandler(object):
logger.info("Resolving conflicted state for %r", room_id)
with Measure(self.clock, "state._resolve_events"):
new_state = yield resolve_events_with_store(
room_id,
room_version,
list(itervalues(state_groups_ids)),
event_map=event_map,
@ -589,36 +591,44 @@ def _make_state_cache_entry(new_state, state_groups_ids):
)
def resolve_events_with_store(room_version, state_sets, event_map, state_res_store):
def resolve_events_with_store(
room_id: str,
room_version: str,
state_sets: List[Dict[Tuple[str, str], str]],
event_map: Optional[Dict[str, EventBase]],
state_res_store: "StateResolutionStore",
):
"""
Args:
room_version(str): Version of the room
room_id: the room we are working in
state_sets(list): List of dicts of (type, state_key) -> event_id,
room_version: Version of the room
state_sets: List of dicts of (type, state_key) -> event_id,
which are the different state groups to resolve.
event_map(dict[str,FrozenEvent]|None):
event_map:
a dict from event_id to event, for any events that we happen to
have in flight (eg, those currently being persisted). This will be
used as a starting point fof finding the state we need; any missing
events will be requested via state_map_factory.
If None, all events will be fetched via state_map_factory.
If None, all events will be fetched via state_res_store.
state_res_store (StateResolutionStore)
state_res_store: a place to fetch events from
Returns
Returns:
Deferred[dict[(str, str), str]]:
a map from (type, state_key) to event_id.
"""
v = KNOWN_ROOM_VERSIONS[room_version]
if v.state_res == StateResolutionVersions.V1:
return v1.resolve_events_with_store(
state_sets, event_map, state_res_store.get_events
room_id, state_sets, event_map, state_res_store.get_events
)
else:
return v2.resolve_events_with_store(
room_version, state_sets, event_map, state_res_store
room_id, room_version, state_sets, event_map, state_res_store
)

34
synapse/state/v1.py
View file

@ -15,6 +15,7 @@
import hashlib
import logging
from typing import Callable, Dict, List, Optional, Tuple
from six import iteritems, iterkeys, itervalues
@ -24,6 +25,7 @@ from synapse import event_auth
from synapse.api.constants import EventTypes
from synapse.api.errors import AuthError
from synapse.api.room_versions import RoomVersions
from synapse.events import EventBase
logger = logging.getLogger(__name__)
@ -32,13 +34,20 @@ POWER_KEY = (EventTypes.PowerLevels, "")
@defer.inlineCallbacks
def resolve_events_with_store(state_sets, event_map, state_map_factory):
def resolve_events_with_store(
room_id: str,
state_sets: List[Dict[Tuple[str, str], str]],
event_map: Optional[Dict[str, EventBase]],
state_map_factory: Callable,
):
"""
Args:
state_sets(list): List of dicts of (type, state_key) -> event_id,
room_id: the room we are working in
state_sets: List of dicts of (type, state_key) -> event_id,
which are the different state groups to resolve.
event_map(dict[str,FrozenEvent]|None):
event_map:
a dict from event_id to event, for any events that we happen to
have in flight (eg, those currently being persisted). This will be
used as a starting point fof finding the state we need; any missing
@ -46,11 +55,11 @@ def resolve_events_with_store(state_sets, event_map, state_map_factory):
If None, all events will be fetched via state_map_factory.
state_map_factory(func): will be called
state_map_factory: will be called
with a list of event_ids that are needed, and should return with
a Deferred of dict of event_id to event.
Returns
Returns:
Deferred[dict[(str, str), str]]:
a map from (type, state_key) to event_id.
"""
@ -76,6 +85,14 @@ def resolve_events_with_store(state_sets, event_map, state_map_factory):
if event_map is not None:
state_map.update(event_map)
# everything in the state map should be in the right room
for event in state_map.values():
if event.room_id != room_id:
raise Exception(
"Attempting to state-resolve for room %s with event %s which is in %s"
% (room_id, event.event_id, event.room_id,)
)
# get the ids of the auth events which allow us to authenticate the
# conflicted state, picking only from the unconflicting state.
#
@ -95,6 +112,13 @@ def resolve_events_with_store(state_sets, event_map, state_map_factory):
)
state_map_new = yield state_map_factory(new_needed_events)
for event in state_map_new.values():
if event.room_id != room_id:
raise Exception(
"Attempting to state-resolve for room %s with event %s which is in %s"
% (room_id, event.event_id, event.room_id,)
)
state_map.update(state_map_new)
return _resolve_with_state(

100
synapse/state/v2.py
View file

@ -16,29 +16,40 @@
import heapq
import itertools
import logging
from typing import Dict, List, Optional, Tuple
from six import iteritems, itervalues
from twisted.internet import defer
import synapse.state
from synapse import event_auth
from synapse.api.constants import EventTypes
from synapse.api.errors import AuthError
from synapse.events import EventBase
logger = logging.getLogger(__name__)
@defer.inlineCallbacks
def resolve_events_with_store(room_version, state_sets, event_map, state_res_store):
def resolve_events_with_store(
room_id: str,
room_version: str,
state_sets: List[Dict[Tuple[str, str], str]],
event_map: Optional[Dict[str, EventBase]],
state_res_store: "synapse.state.StateResolutionStore",
):
"""Resolves the state using the v2 state resolution algorithm
Args:
room_version (str): The room version
room_id: the room we are working in
state_sets(list): List of dicts of (type, state_key) -> event_id,
room_version: The room version
state_sets: List of dicts of (type, state_key) -> event_id,
which are the different state groups to resolve.
event_map(dict[str,FrozenEvent]|None):
event_map:
a dict from event_id to event, for any events that we happen to
have in flight (eg, those currently being persisted). This will be
used as a starting point fof finding the state we need; any missing
@ -46,9 +57,9 @@ def resolve_events_with_store(room_version, state_sets, event_map, state_res_sto
If None, all events will be fetched via state_res_store.
state_res_store (StateResolutionStore)
state_res_store:
Returns
Returns:
Deferred[dict[(str, str), str]]:
a map from (type, state_key) to event_id.
"""
@ -84,6 +95,14 @@ def resolve_events_with_store(room_version, state_sets, event_map, state_res_sto
)
event_map.update(events)
# everything in the event map should be in the right room
for event in event_map.values():
if event.room_id != room_id:
raise Exception(
"Attempting to state-resolve for room %s with event %s which is in %s"
% (room_id, event.event_id, event.room_id,)
)
full_conflicted_set = set(eid for eid in full_conflicted_set if eid in event_map)
logger.debug("%d full_conflicted_set entries", len(full_conflicted_set))
@ -94,13 +113,14 @@ def resolve_events_with_store(room_version, state_sets, event_map, state_res_sto
)
sorted_power_events = yield _reverse_topological_power_sort(
power_events, event_map, state_res_store, full_conflicted_set
room_id, power_events, event_map, state_res_store, full_conflicted_set
)
logger.debug("sorted %d power events", len(sorted_power_events))
# Now sequentially auth each one
resolved_state = yield _iterative_auth_checks(
room_id,
room_version,
sorted_power_events,
unconflicted_state,
@ -121,13 +141,18 @@ def resolve_events_with_store(room_version, state_sets, event_map, state_res_sto
pl = resolved_state.get((EventTypes.PowerLevels, ""), None)
leftover_events = yield _mainline_sort(
leftover_events, pl, event_map, state_res_store
room_id, leftover_events, pl, event_map, state_res_store
)
logger.debug("resolving remaining events")
resolved_state = yield _iterative_auth_checks(
room_version, leftover_events, resolved_state, event_map, state_res_store
room_id,
room_version,
leftover_events,
resolved_state,
event_map,
state_res_store,
)
logger.debug("resolved")
@ -141,11 +166,12 @@ def resolve_events_with_store(room_version, state_sets, event_map, state_res_sto
@defer.inlineCallbacks
def _get_power_level_for_sender(event_id, event_map, state_res_store):
def _get_power_level_for_sender(room_id, event_id, event_map, state_res_store):
"""Return the power level of the sender of the given event according to
their auth events.
Args:
room_id (str)
event_id (str)
event_map (dict[str,FrozenEvent])
state_res_store (StateResolutionStore)
@ -153,11 +179,11 @@ def _get_power_level_for_sender(event_id, event_map, state_res_store):
Returns:
Deferred[int]
"""
event = yield _get_event(event_id, event_map, state_res_store)
event = yield _get_event(room_id, event_id, event_map, state_res_store)
pl = None
for aid in event.auth_event_ids():
aev = yield _get_event(aid, event_map, state_res_store)
aev = yield _get_event(room_id, aid, event_map, state_res_store)
if (aev.type, aev.state_key) == (EventTypes.PowerLevels, ""):
pl = aev
break
@ -165,7 +191,7 @@ def _get_power_level_for_sender(event_id, event_map, state_res_store):
if pl is None:
# Couldn't find power level. Check if they're the creator of the room
for aid in event.auth_event_ids():
aev = yield _get_event(aid, event_map, state_res_store)
aev = yield _get_event(room_id, aid, event_map, state_res_store)
if (aev.type, aev.state_key) == (EventTypes.Create, ""):
if aev.content.get("creator") == event.sender:
return 100
@ -279,7 +305,7 @@ def _is_power_event(event):
@defer.inlineCallbacks
def _add_event_and_auth_chain_to_graph(
graph, event_id, event_map, state_res_store, auth_diff
graph, room_id, event_id, event_map, state_res_store, auth_diff
):
"""Helper function for _reverse_topological_power_sort that add the event
and its auth chain (that is in the auth diff) to the graph
@ -287,6 +313,7 @@ def _add_event_and_auth_chain_to_graph(
Args:
graph (dict[str, set[str]]): A map from event ID to the events auth
event IDs
room_id (str): the room we are working in
event_id (str): Event to add to the graph
event_map (dict[str,FrozenEvent])
state_res_store (StateResolutionStore)
@ -298,7 +325,7 @@ def _add_event_and_auth_chain_to_graph(
eid = state.pop()
graph.setdefault(eid, set())
event = yield _get_event(eid, event_map, state_res_store)
event = yield _get_event(room_id, eid, event_map, state_res_store)
for aid in event.auth_event_ids():
if aid in auth_diff:
if aid not in graph:
@ -308,11 +335,14 @@ def _add_event_and_auth_chain_to_graph(
@defer.inlineCallbacks
def _reverse_topological_power_sort(event_ids, event_map, state_res_store, auth_diff):
def _reverse_topological_power_sort(
room_id, event_ids, event_map, state_res_store, auth_diff
):
"""Returns a list of the event_ids sorted by reverse topological ordering,
and then by power level and origin_server_ts
Args:
room_id (str): the room we are working in
event_ids (list[str]): The events to sort
event_map (dict[str,FrozenEvent])
state_res_store (StateResolutionStore)
@ -325,12 +355,14 @@ def _reverse_topological_power_sort(event_ids, event_map, state_res_store, auth_
graph = {}
for event_id in event_ids:
yield _add_event_and_auth_chain_to_graph(
graph, event_id, event_map, state_res_store, auth_diff
graph, room_id, event_id, event_map, state_res_store, auth_diff
)
event_to_pl = {}
for event_id in graph:
pl = yield _get_power_level_for_sender(event_id, event_map, state_res_store)
pl = yield _get_power_level_for_sender(
room_id, event_id, event_map, state_res_store
)
event_to_pl[event_id] = pl
def _get_power_order(event_id):
@ -348,12 +380,13 @@ def _reverse_topological_power_sort(event_ids, event_map, state_res_store, auth_
@defer.inlineCallbacks
def _iterative_auth_checks(
room_version, event_ids, base_state, event_map, state_res_store
room_id, room_version, event_ids, base_state, event_map, state_res_store
):
"""Sequentially apply auth checks to each event in given list, updating the
state as it goes along.
Args:
room_id (str)
room_version (str)
event_ids (list[str]): Ordered list of events to apply auth checks to
base_state (dict[tuple[str, str], str]): The set of state to start with
@ -370,7 +403,7 @@ def _iterative_auth_checks(
auth_events = {}
for aid in event.auth_event_ids():
ev = yield _get_event(aid, event_map, state_res_store)
ev = yield _get_event(room_id, aid, event_map, state_res_store)
if ev.rejected_reason is None:
auth_events[(ev.type, ev.state_key)] = ev
@ -378,7 +411,7 @@ def _iterative_auth_checks(
for key in event_auth.auth_types_for_event(event):
if key in resolved_state:
ev_id = resolved_state[key]
ev = yield _get_event(ev_id, event_map, state_res_store)
ev = yield _get_event(room_id, ev_id, event_map, state_res_store)
if ev.rejected_reason is None:
auth_events[key] = event_map[ev_id]
@ -400,11 +433,14 @@ def _iterative_auth_checks(
@defer.inlineCallbacks
def _mainline_sort(event_ids, resolved_power_event_id, event_map, state_res_store):
def _mainline_sort(
room_id, event_ids, resolved_power_event_id, event_map, state_res_store
):
"""Returns a sorted list of event_ids sorted by mainline ordering based on
the given event resolved_power_event_id
Args:
room_id (str): room we're working in
event_ids (list[str]): Events to sort
resolved_power_event_id (str): The final resolved power level event ID
event_map (dict[str,FrozenEvent])
@ -417,11 +453,11 @@ def _mainline_sort(event_ids, resolved_power_event_id, event_map, state_res_stor
pl = resolved_power_event_id
while pl:
mainline.append(pl)
pl_ev = yield _get_event(pl, event_map, state_res_store)
pl_ev = yield _get_event(room_id, pl, event_map, state_res_store)
auth_events = pl_ev.auth_event_ids()
pl = None
for aid in auth_events:
ev = yield _get_event(aid, event_map, state_res_store)
ev = yield _get_event(room_id, aid, event_map, state_res_store)
if (ev.type, ev.state_key) == (EventTypes.PowerLevels, ""):
pl = aid
break
@ -457,6 +493,8 @@ def _get_mainline_depth_for_event(event, mainline_map, event_map, state_res_stor
Deferred[int]
"""
room_id = event.room_id
# We do an iterative search, replacing `event with the power level in its
# auth events (if any)
while event:
@ -468,7 +506,7 @@ def _get_mainline_depth_for_event(event, mainline_map, event_map, state_res_stor
event = None
for aid in auth_events:
aev = yield _get_event(aid, event_map, state_res_store)
aev = yield _get_event(room_id, aid, event_map, state_res_store)
if (aev.type, aev.state_key) == (EventTypes.PowerLevels, ""):
event = aev
break
@ -478,11 +516,12 @@ def _get_mainline_depth_for_event(event, mainline_map, event_map, state_res_stor
@defer.inlineCallbacks
def _get_event(event_id, event_map, state_res_store):
def _get_event(room_id, event_id, event_map, state_res_store):
"""Helper function to look up event in event_map, falling back to looking
it up in the store
Args:
room_id (str)
event_id (str)
event_map (dict[str,FrozenEvent])
state_res_store (StateResolutionStore)
@ -493,7 +532,14 @@ def _get_event(event_id, event_map, state_res_store):
if event_id not in event_map:
events = yield state_res_store.get_events([event_id], allow_rejected=True)
event_map.update(events)
return event_map[event_id]
event = event_map[event_id]
assert event is not None
if event.room_id != room_id:
raise Exception(
"In state res for room %s, event %s is in %s"
% (room_id, event_id, event.room_id)
)
return event
def lexicographical_topological_sort(graph, key):

3
tests/state/test_v2.py
View file

@ -58,6 +58,7 @@ class FakeEvent(object):
self.type = type
self.state_key = state_key
self.content = content
self.room_id = ROOM_ID
def to_event(self, auth_events, prev_events):
"""Given the auth_events and prev_events, convert to a Frozen Event
@ -418,6 +419,7 @@ class StateTestCase(unittest.TestCase):
state_before = dict(state_at_event[prev_events[0]])
else:
state_d = resolve_events_with_store(
ROOM_ID,
RoomVersions.V2.identifier,
[state_at_event[n] for n in prev_events],
event_map=event_map,
@ -565,6 +567,7 @@ class SimpleParamStateTestCase(unittest.TestCase):
# Test that we correctly handle passing `None` as the event_map
state_d = resolve_events_with_store(
ROOM_ID,
RoomVersions.V2.identifier,
[self.state_at_bob, self.state_at_charlie],
event_map=None,