Make POST /_matrix/client/v3/rooms/{roomId}/report/{eventId} endpoint return 404 if event exists, but the user lacks access (#15300)

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Andrew Morgan 2023-03-21 13:24:03 +00:00 committed by GitHub
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5 changed files with 61 additions and 6 deletions

1
changelog.d/15300.bugfix Normal file
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@ -0,0 +1 @@
Fix a bug in which the [`POST /_matrix/client/v3/rooms/{roomId}/report/{eventId}`](https://spec.matrix.org/v1.6/client-server-api/#post_matrixclientv3roomsroomidreporteventid) endpoint would return the wrong error if the user did not have permission to view the event. This aligns Synapse's implementation with [MSC2249](https://github.com/matrix-org/matrix-spec-proposals/pull/2249).

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@ -88,6 +88,18 @@ process, for example:
dpkg -i matrix-synapse-py3_1.3.0+stretch1_amd64.deb
```
# Upgrading to v1.80.0
## Reporting events error code change
Before this update, the
[`POST /_matrix/client/v3/rooms/{roomId}/report/{eventId}`](https://spec.matrix.org/v1.6/client-server-api/#post_matrixclientv3roomsroomidreporteventid)
endpoint would return a `403` if a user attempted to report an event that they did not have access to.
This endpoint will now return a `404` in this case instead.
Clients that implement event reporting should check that their error handling code will handle this
change.
# Upgrading to v1.79.0
## The `on_threepid_bind` module callback method has been deprecated

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@ -16,7 +16,7 @@ import logging
from http import HTTPStatus
from typing import TYPE_CHECKING, Tuple
from synapse.api.errors import Codes, NotFoundError, SynapseError
from synapse.api.errors import AuthError, Codes, NotFoundError, SynapseError
from synapse.http.server import HttpServer
from synapse.http.servlet import RestServlet, parse_json_object_from_request
from synapse.http.site import SynapseRequest
@ -62,12 +62,18 @@ class ReportEventRestServlet(RestServlet):
Codes.BAD_JSON,
)
event = await self._event_handler.get_event(
requester.user, room_id, event_id, show_redacted=False
)
try:
event = await self._event_handler.get_event(
requester.user, room_id, event_id, show_redacted=False
)
except AuthError:
# The event exists, but this user is not allowed to access this event.
event = None
if event is None:
raise NotFoundError(
"Unable to report event: it does not exist or you aren't able to see it."
"Unable to report event: "
"it does not exist or you aren't able to see it."
)
await self.store.add_event_report(

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@ -805,7 +805,6 @@ class EventsWorkerStore(SQLBaseStore):
# the events have been redacted, and if so pulling the redaction event
# out of the database to check it.
#
missing_events = {}
try:
# Try to fetch from any external cache. We already checked the
# in-memory cache above.

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@ -90,6 +90,43 @@ class ReportEventTestCase(unittest.HomeserverTestCase):
msg=channel.result["body"],
)
def test_cannot_report_event_if_not_in_room(self) -> None:
"""
Tests that we don't accept event reports for events that exist, but for which
the reporter should not be able to view (because they are not in the room).
"""
# Have the admin user create a room (the "other" user will not join this room).
new_room_id = self.helper.create_room_as(tok=self.admin_user_tok)
# Have the admin user send an event in this room.
response = self.helper.send_event(
new_room_id,
"m.room.message",
content={
"msgtype": "m.text",
"body": "This event has some bad words in it! Flip!",
},
tok=self.admin_user_tok,
)
event_id = response["event_id"]
# Have the "other" user attempt to report it. Perhaps they found the event ID
# in a screenshot or something...
channel = self.make_request(
"POST",
f"rooms/{new_room_id}/report/{event_id}",
{"reason": "I'm not in this room but I have opinions anyways!"},
access_token=self.other_user_tok,
)
# The "other" user is not in the room, so their report should be rejected.
self.assertEqual(404, channel.code, msg=channel.result["body"])
self.assertEqual(
"Unable to report event: it does not exist or you aren't able to see it.",
channel.json_body["error"],
msg=channel.result["body"],
)
def _assert_status(self, response_status: int, data: JsonDict) -> None:
channel = self.make_request(
"POST", self.report_path, data, access_token=self.other_user_tok