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Prevent redacted events from appearing in message search (#6377)

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Andrew Morgan 2019-12-11 13:39:47 +00:00 committed by GitHub
parent 6676ee9c4a
commit fc316a4894
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6 changed files with 78 additions and 43 deletions
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1
changelog.d/6377.bugfix Normal file
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@ -0,0 +1 @@
Prevent redacted events from being returned during message search.

7
synapse/handlers/federation.py
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@ -63,6 +63,7 @@ from synapse.replication.http.federation import (
)
from synapse.replication.http.membership import ReplicationUserJoinedLeftRoomRestServlet
from synapse.state import StateResolutionStore, resolve_events_with_store
from synapse.storage.data_stores.main.events_worker import EventRedactBehaviour
from synapse.types import UserID, get_domain_from_id
from synapse.util import batch_iter, unwrapFirstError
from synapse.util.async_helpers import Linearizer
@ -423,7 +424,7 @@ class FederationHandler(BaseHandler):
evs = yield self.store.get_events(
list(state_map.values()),
get_prev_content=False,
check_redacted=False,
redact_behaviour=EventRedactBehaviour.AS_IS,
)
event_map.update(evs)
@ -1000,7 +1001,9 @@ class FederationHandler(BaseHandler):
forward_events = yield self.store.get_successor_events(list(extremities))
extremities_events = yield self.store.get_events(
forward_events, check_redacted=False, get_prev_content=False
forward_events,
redact_behaviour=EventRedactBehaviour.AS_IS,
get_prev_content=False,
)
# We set `check_history_visibility_only` as we might otherwise get false

5
synapse/handlers/message.py
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@ -46,6 +46,7 @@ from synapse.events.validator import EventValidator
from synapse.logging.context import run_in_background
from synapse.metrics.background_process_metrics import run_as_background_process
from synapse.replication.http.send_event import ReplicationSendEventRestServlet
from synapse.storage.data_stores.main.events_worker import EventRedactBehaviour
from synapse.storage.state import StateFilter
from synapse.types import RoomAlias, UserID, create_requester
from synapse.util.async_helpers import Linearizer
@ -875,7 +876,7 @@ class EventCreationHandler(object):
if event.type == EventTypes.Redaction:
original_event = yield self.store.get_event(
event.redacts,
check_redacted=False,
redact_behaviour=EventRedactBehaviour.AS_IS,
get_prev_content=False,
allow_rejected=False,
allow_none=True,
@ -952,7 +953,7 @@ class EventCreationHandler(object):
if event.type == EventTypes.Redaction:
original_event = yield self.store.get_event(
event.redacts,
check_redacted=False,
redact_behaviour=EventRedactBehaviour.AS_IS,
get_prev_content=False,
allow_rejected=False,
allow_none=True,

3
synapse/state/__init__.py
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@ -32,6 +32,7 @@ from synapse.events import EventBase
from synapse.events.snapshot import EventContext
from synapse.logging.utils import log_function
from synapse.state import v1, v2
from synapse.storage.data_stores.main.events_worker import EventRedactBehaviour
from synapse.util.async_helpers import Linearizer
from synapse.util.caches import get_cache_factor_for
from synapse.util.caches.expiringcache import ExpiringCache
@ -645,7 +646,7 @@ class StateResolutionStore(object):
return self.store.get_events(
event_ids,
check_redacted=False,
redact_behaviour=EventRedactBehaviour.AS_IS,
get_prev_content=False,
allow_rejected=allow_rejected,
)

97
synapse/storage/data_stores/main/events_worker.py
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@ -19,8 +19,10 @@ import itertools
import logging
import threading
from collections import namedtuple
from typing import List, Optional
from canonicaljson import json
from constantly import NamedConstant, Names
from twisted.internet import defer
@ -55,6 +57,16 @@ EVENT_QUEUE_TIMEOUT_S = 0.1 # Timeout when waiting for requests for events
_EventCacheEntry = namedtuple("_EventCacheEntry", ("event", "redacted_event"))
class EventRedactBehaviour(Names):
"""
What to do when retrieving a redacted event from the database.
"""
AS_IS = NamedConstant()
REDACT = NamedConstant()
BLOCK = NamedConstant()
class EventsWorkerStore(SQLBaseStore):
def __init__(self, database: Database, db_conn, hs):
super(EventsWorkerStore, self).__init__(database, db_conn, hs)
@ -125,25 +137,27 @@ class EventsWorkerStore(SQLBaseStore):
@defer.inlineCallbacks
def get_event(
self,
event_id,
check_redacted=True,
get_prev_content=False,
allow_rejected=False,
allow_none=False,
check_room_id=None,
event_id: List[str],
redact_behaviour: EventRedactBehaviour = EventRedactBehaviour.REDACT,
get_prev_content: bool = False,
allow_rejected: bool = False,
allow_none: bool = False,
check_room_id: Optional[str] = None,
):
"""Get an event from the database by event_id.
Args:
event_id (str): The event_id of the event to fetch
check_redacted (bool): If True, check if event has been redacted
and redact it.
get_prev_content (bool): If True and event is a state event,
event_id: The event_id of the event to fetch
redact_behaviour: Determine what to do with a redacted event. Possible values:
* AS_IS - Return the full event body with no redacted content
* REDACT - Return the event but with a redacted body
* DISALLOW - Do not return redacted events
get_prev_content: If True and event is a state event,
include the previous states content in the unsigned field.
allow_rejected (bool): If True return rejected events.
allow_none (bool): If True, return None if no event found, if
allow_rejected: If True return rejected events.
allow_none: If True, return None if no event found, if
False throw a NotFoundError
check_room_id (str|None): if not None, check the room of the found event.
check_room_id: if not None, check the room of the found event.
If there is a mismatch, behave as per allow_none.
Returns:
@ -154,7 +168,7 @@ class EventsWorkerStore(SQLBaseStore):
events = yield self.get_events_as_list(
[event_id],
check_redacted=check_redacted,
redact_behaviour=redact_behaviour,
get_prev_content=get_prev_content,
allow_rejected=allow_rejected,
)
@ -173,27 +187,30 @@ class EventsWorkerStore(SQLBaseStore):
@defer.inlineCallbacks
def get_events(
self,
event_ids,
check_redacted=True,
get_prev_content=False,
allow_rejected=False,
event_ids: List[str],
redact_behaviour: EventRedactBehaviour = EventRedactBehaviour.REDACT,
get_prev_content: bool = False,
allow_rejected: bool = False,
):
"""Get events from the database
Args:
event_ids (list): The event_ids of the events to fetch
check_redacted (bool): If True, check if event has been redacted
and redact it.
get_prev_content (bool): If True and event is a state event,
event_ids: The event_ids of the events to fetch
redact_behaviour: Determine what to do with a redacted event. Possible
values:
* AS_IS - Return the full event body with no redacted content
* REDACT - Return the event but with a redacted body
* DISALLOW - Do not return redacted events
get_prev_content: If True and event is a state event,
include the previous states content in the unsigned field.
allow_rejected (bool): If True return rejected events.
allow_rejected: If True return rejected events.
Returns:
Deferred : Dict from event_id to event.
"""
events = yield self.get_events_as_list(
event_ids,
check_redacted=check_redacted,
redact_behaviour=redact_behaviour,
get_prev_content=get_prev_content,
allow_rejected=allow_rejected,
)
@ -203,21 +220,23 @@ class EventsWorkerStore(SQLBaseStore):
@defer.inlineCallbacks
def get_events_as_list(
self,
event_ids,
check_redacted=True,
get_prev_content=False,
allow_rejected=False,
event_ids: List[str],
redact_behaviour: EventRedactBehaviour = EventRedactBehaviour.REDACT,
get_prev_content: bool = False,
allow_rejected: bool = False,
):
"""Get events from the database and return in a list in the same order
as given by `event_ids` arg.
Args:
event_ids (list): The event_ids of the events to fetch
check_redacted (bool): If True, check if event has been redacted
and redact it.
get_prev_content (bool): If True and event is a state event,
event_ids: The event_ids of the events to fetch
redact_behaviour: Determine what to do with a redacted event. Possible values:
* AS_IS - Return the full event body with no redacted content
* REDACT - Return the event but with a redacted body
* DISALLOW - Do not return redacted events
get_prev_content: If True and event is a state event,
include the previous states content in the unsigned field.
allow_rejected (bool): If True return rejected events.
allow_rejected: If True, return rejected events.
Returns:
Deferred[list[EventBase]]: List of events fetched from the database. The
@ -319,10 +338,14 @@ class EventsWorkerStore(SQLBaseStore):
# Update the cache to save doing the checks again.
entry.event.internal_metadata.recheck_redaction = False
if check_redacted and entry.redacted_event:
event = entry.redacted_event
else:
event = entry.event
event = entry.event
if entry.redacted_event:
if redact_behaviour == EventRedactBehaviour.BLOCK:
# Skip this event
continue
elif redact_behaviour == EventRedactBehaviour.REDACT:
event = entry.redacted_event
events.append(event)

8
synapse/storage/data_stores/main/search.py
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@ -25,6 +25,7 @@ from twisted.internet import defer
from synapse.api.errors import SynapseError
from synapse.storage._base import SQLBaseStore, make_in_list_sql_clause
from synapse.storage.data_stores.main.events_worker import EventRedactBehaviour
from synapse.storage.database import Database
from synapse.storage.engines import PostgresEngine, Sqlite3Engine
@ -453,7 +454,12 @@ class SearchStore(SearchBackgroundUpdateStore):
results = list(filter(lambda row: row["room_id"] in room_ids, results))
events = yield self.get_events_as_list([r["event_id"] for r in results])
# We set redact_behaviour to BLOCK here to prevent redacted events being returned in
# search results (which is a data leak)
events = yield self.get_events_as_list(
[r["event_id"] for r in results],
redact_behaviour=EventRedactBehaviour.BLOCK,
)
event_map = {ev.event_id: ev for ev in events}