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Allow a user who could join a restricted room to see it in spaces summary. (#9922) 

This finishes up the experimental implementation of MSC3083 by showing
the restricted rooms in the spaces summary (from MSC2946).
This commit is contained in:
Patrick Cloke 2021-05-20 11:10:36 -04:00 committed by GitHub
parent d983ced596
commit 551d2c3f4b
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4 changed files with 252 additions and 52 deletions
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1
changelog.d/9922.feature Normal file
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@ -0,0 +1 @@
Experimental support to allow a user who could join a restricted room to view it in the spaces summary.

2
synapse/federation/transport/server.py
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@ -1428,7 +1428,7 @@ class FederationSpaceSummaryServlet(BaseFederationServlet):
)
return 200, await self.handler.federation_space_summary(
room_id, suggested_only, max_rooms_per_space, exclude_rooms
origin, room_id, suggested_only, max_rooms_per_space, exclude_rooms
)

104
synapse/handlers/event_auth.py
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@ -11,7 +11,7 @@
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from typing import TYPE_CHECKING, Optional
from typing import TYPE_CHECKING, Collection, Optional
from synapse.api.constants import EventTypes, JoinRules, Membership
from synapse.api.errors import AuthError
@ -59,32 +59,76 @@ class EventAuthHandler:
):
return
# This is not a room with a restricted join rule, so we don't need to do the
# restricted room specific checks.
#
# Note: We'll be applying the standard join rule checks later, which will
# catch the cases of e.g. trying to join private rooms without an invite.
if not await self.has_restricted_join_rules(state_ids, room_version):
return
# Get the spaces which allow access to this room and check if the user is
# in any of them.
allowed_spaces = await self.get_spaces_that_allow_join(state_ids)
if not await self.is_user_in_rooms(allowed_spaces, user_id):
raise AuthError(
403,
"You do not belong to any of the required spaces to join this room.",
)
async def has_restricted_join_rules(
self, state_ids: StateMap[str], room_version: RoomVersion
) -> bool:
"""
Return if the room has the proper join rules set for access via spaces.
Args:
state_ids: The state of the room as it currently is.
room_version: The room version of the room to query.
Returns:
True if the proper room version and join rules are set for restricted access.
"""
# This only applies to room versions which support the new join rule.
if not room_version.msc3083_join_rules:
return
return False
# If there's no join rule, then it defaults to invite (so this doesn't apply).
join_rules_event_id = state_ids.get((EventTypes.JoinRules, ""), None)
if not join_rules_event_id:
return
return False
# If the join rule is not restricted, this doesn't apply.
join_rules_event = await self._store.get_event(join_rules_event_id)
return join_rules_event.content.get("join_rule") == JoinRules.MSC3083_RESTRICTED
async def get_spaces_that_allow_join(
self, state_ids: StateMap[str]
) -> Collection[str]:
"""
Generate a list of spaces which allow access to a room.
Args:
state_ids: The state of the room as it currently is.
Returns:
A collection of spaces which provide membership to the room.
"""
# If there's no join rule, then it defaults to invite (so this doesn't apply).
join_rules_event_id = state_ids.get((EventTypes.JoinRules, ""), None)
if not join_rules_event_id:
return ()
# If the join rule is not restricted, this doesn't apply.
join_rules_event = await self._store.get_event(join_rules_event_id)
if join_rules_event.content.get("join_rule") != JoinRules.MSC3083_RESTRICTED:
return
# If allowed is of the wrong form, then only allow invited users.
allowed_spaces = join_rules_event.content.get("allow", [])
if not isinstance(allowed_spaces, list):
allowed_spaces = ()
# Get the list of joined rooms and see if there's an overlap.
if allowed_spaces:
joined_rooms = await self._store.get_rooms_for_user(user_id)
else:
joined_rooms = ()
return ()
# Pull out the other room IDs, invalid data gets filtered.
result = []
for space in allowed_spaces:
if not isinstance(space, dict):
continue
@ -93,13 +137,31 @@ class EventAuthHandler:
if not isinstance(space_id, str):
continue
# The user was joined to one of the spaces specified, they can join
# this room!
if space_id in joined_rooms:
return
result.append(space_id)
# The user was not in any of the required spaces.
raise AuthError(
403,
"You do not belong to any of the required spaces to join this room.",
)
return result
async def is_user_in_rooms(self, room_ids: Collection[str], user_id: str) -> bool:
"""
Check whether a user is a member of any of the provided rooms.
Args:
room_ids: The rooms to check for membership.
user_id: The user to check.
Returns:
True if the user is in any of the rooms, false otherwise.
"""
if not room_ids:
return False
# Get the list of joined rooms and see if there's an overlap.
joined_rooms = await self._store.get_rooms_for_user(user_id)
# Check each room and see if the user is in it.
for room_id in room_ids:
if room_id in joined_rooms:
return True
# The user was not in any of the rooms.
return False

193
synapse/handlers/space_summary.py
View File

@ -16,11 +16,16 @@ import itertools
import logging
import re
from collections import deque
from typing import TYPE_CHECKING, Iterable, List, Optional, Sequence, Set, Tuple, cast
from typing import TYPE_CHECKING, Iterable, List, Optional, Sequence, Set, Tuple
import attr
from synapse.api.constants import EventContentFields, EventTypes, HistoryVisibility
from synapse.api.constants import (
EventContentFields,
EventTypes,
HistoryVisibility,
Membership,
)
from synapse.api.errors import AuthError
from synapse.events import EventBase
from synapse.events.utils import format_event_for_client_v2
@ -47,6 +52,7 @@ class SpaceSummaryHandler:
self._auth = hs.get_auth()
self._room_list_handler = hs.get_room_list_handler()
self._state_handler = hs.get_state_handler()
self._event_auth_handler = hs.get_event_auth_handler()
self._store = hs.get_datastore()
self._event_serializer = hs.get_event_client_serializer()
self._server_name = hs.hostname
@ -111,28 +117,88 @@ class SpaceSummaryHandler:
max_children = max_rooms_per_space if processed_rooms else None
if is_in_room:
rooms, events = await self._summarize_local_room(
requester, room_id, suggested_only, max_children
room, events = await self._summarize_local_room(
requester, None, room_id, suggested_only, max_children
)
logger.debug(
"Query of local room %s returned events %s",
room_id,
["%s->%s" % (ev["room_id"], ev["state_key"]) for ev in events],
)
if room:
rooms_result.append(room)
else:
rooms, events = await self._summarize_remote_room(
fed_rooms, fed_events = await self._summarize_remote_room(
queue_entry,
suggested_only,
max_children,
exclude_rooms=processed_rooms,
)
logger.debug(
"Query of %s returned rooms %s, events %s",
queue_entry.room_id,
[room.get("room_id") for room in rooms],
["%s->%s" % (ev["room_id"], ev["state_key"]) for ev in events],
# The results over federation might include rooms that the we,
# as the requesting server, are allowed to see, but the requesting
# user is not permitted see.
#
# Filter the returned results to only what is accessible to the user.
room_ids = set()
events = []
for room in fed_rooms:
fed_room_id = room.get("room_id")
if not fed_room_id or not isinstance(fed_room_id, str):
continue
# The room should only be included in the summary if:
# a. the user is in the room;
# b. the room is world readable; or
# c. the user is in a space that has been granted access to
# the room.
#
# Note that we know the user is not in the root room (which is
# why the remote call was made in the first place), but the user
# could be in one of the children rooms and we just didn't know
# about the link.
include_room = room.get("world_readable") is True
# Check if the user is a member of any of the allowed spaces
# from the response.
allowed_spaces = room.get("allowed_spaces")
if (
not include_room
and allowed_spaces
and isinstance(allowed_spaces, list)
):
include_room = await self._event_auth_handler.is_user_in_rooms(
allowed_spaces, requester
)
rooms_result.extend(rooms)
# Finally, if this isn't the requested room, check ourselves
# if we can access the room.
if not include_room and fed_room_id != queue_entry.room_id:
include_room = await self._is_room_accessible(
fed_room_id, requester, None
)
# any rooms returned don't need visiting again
processed_rooms.update(cast(str, room.get("room_id")) for room in rooms)
# The user can see the room, include it!
if include_room:
rooms_result.append(room)
room_ids.add(fed_room_id)
# All rooms returned don't need visiting again (even if the user
# didn't have access to them).
processed_rooms.add(fed_room_id)
for event in fed_events:
if event.get("room_id") in room_ids:
events.append(event)
logger.debug(
"Query of %s returned rooms %s, events %s",
room_id,
[room.get("room_id") for room in fed_rooms],
["%s->%s" % (ev["room_id"], ev["state_key"]) for ev in fed_events],
)
# the room we queried may or may not have been returned, but don't process
# it again, anyway.
@ -158,10 +224,16 @@ class SpaceSummaryHandler:
)
processed_events.add(ev_key)
# Before returning to the client, remove the allowed_spaces key for any
# rooms.
for room in rooms_result:
room.pop("allowed_spaces", None)
return {"rooms": rooms_result, "events": events_result}
async def federation_space_summary(
self,
origin: str,
room_id: str,
suggested_only: bool,
max_rooms_per_space: Optional[int],
@ -171,6 +243,8 @@ class SpaceSummaryHandler:
Implementation of the space summary Federation API
Args:
origin: The server requesting the spaces summary.
room_id: room id to start the summary at
suggested_only: whether we should only return children with the "suggested"
@ -205,13 +279,14 @@ class SpaceSummaryHandler:
logger.debug("Processing room %s", room_id)
rooms, events = await self._summarize_local_room(
None, room_id, suggested_only, max_rooms_per_space
room, events = await self._summarize_local_room(
None, origin, room_id, suggested_only, max_rooms_per_space
)
processed_rooms.add(room_id)
rooms_result.extend(rooms)
if room:
rooms_result.append(room)
events_result.extend(events)
# add any children to the queue
@ -222,10 +297,11 @@ class SpaceSummaryHandler:
async def _summarize_local_room(
self,
requester: Optional[str],
origin: Optional[str],
room_id: str,
suggested_only: bool,
max_children: Optional[int],
) -> Tuple[Sequence[JsonDict], Sequence[JsonDict]]:
) -> Tuple[Optional[JsonDict], Sequence[JsonDict]]:
"""
Generate a room entry and a list of event entries for a given room.
@ -233,6 +309,9 @@ class SpaceSummaryHandler:
requester:
The user requesting the summary, if it is a local request. None
if this is a federation request.
origin:
The server requesting the summary, if it is a federation request.
None if this is a local request.
room_id: The room ID to summarize.
suggested_only: True if only suggested children should be returned.
Otherwise, all children are returned.
@ -247,8 +326,8 @@ class SpaceSummaryHandler:
An iterable of the sorted children events. This may be limited
to a maximum size or may include all children.
"""
if not await self._is_room_accessible(room_id, requester):
return (), ()
if not await self._is_room_accessible(room_id, requester, origin):
return None, ()
room_entry = await self._build_room_entry(room_id)
@ -272,7 +351,7 @@ class SpaceSummaryHandler:
event_format=format_event_for_client_v2,
)
)
return (room_entry,), events_result
return room_entry, events_result
async def _summarize_remote_room(
self,
@ -332,13 +411,17 @@ class SpaceSummaryHandler:
or ev.event_type == EventTypes.SpaceChild
)
async def _is_room_accessible(self, room_id: str, requester: Optional[str]) -> bool:
async def _is_room_accessible(
self, room_id: str, requester: Optional[str], origin: Optional[str]
) -> bool:
"""
Calculate whether the room should be shown in the spaces summary.
It should be included if:
* The requester is joined or invited to the room.
* The requester can join without an invite (per MSC3083).
* The origin server has any user that is joined or invited to the room.
* The history visibility is set to world readable.
Args:
@ -346,31 +429,75 @@ class SpaceSummaryHandler:
requester:
The user requesting the summary, if it is a local request. None
if this is a federation request.
origin:
The server requesting the summary, if it is a federation request.
None if this is a local request.
Returns:
True if the room should be included in the spaces summary.
"""
state_ids = await self._store.get_current_state_ids(room_id)
# If there's no state for the room, it isn't known.
if not state_ids:
logger.info("room %s is unknown, omitting from summary", room_id)
return False
room_version = await self._store.get_room_version(room_id)
# if we have an authenticated requesting user, first check if they are able to view
# stripped state in the room.
if requester:
try:
await self._auth.check_user_in_room(room_id, requester)
member_event_id = state_ids.get((EventTypes.Member, requester), None)
# If they're in the room they can see info on it.
member_event = None
if member_event_id:
member_event = await self._store.get_event(member_event_id)
if member_event.membership in (Membership.JOIN, Membership.INVITE):
return True
# Otherwise, check if they should be allowed access via membership in a space.
try:
await self._event_auth_handler.check_restricted_join_rules(
state_ids, room_version, requester, member_event
)
except AuthError:
# The user doesn't have access due to spaces, but might have access
# another way. Keep trying.
pass
else:
return True
# If this is a request over federation, check if the host is in the room or
# is in one of the spaces specified via the join rules.
elif origin:
if await self._auth.check_host_in_room(room_id, origin):
return True
# Alternately, if the host has a user in any of the spaces specified
# for access, then the host can see this room (and should do filtering
# if the requester cannot see it).
if await self._event_auth_handler.has_restricted_join_rules(
state_ids, room_version
):
allowed_spaces = (
await self._event_auth_handler.get_spaces_that_allow_join(state_ids)
)
for space_id in allowed_spaces:
if await self._auth.check_host_in_room(space_id, origin):
return True
# otherwise, check if the room is peekable
hist_vis_ev = await self._state_handler.get_current_state(
room_id, EventTypes.RoomHistoryVisibility, ""
)
if hist_vis_ev:
hist_vis_event_id = state_ids.get((EventTypes.RoomHistoryVisibility, ""), None)
if hist_vis_event_id:
hist_vis_ev = await self._store.get_event(hist_vis_event_id)
hist_vis = hist_vis_ev.content.get("history_visibility")
if hist_vis == HistoryVisibility.WORLD_READABLE:
return True
logger.info(
"room %s is unpeekable and user %s is not a member, omitting from summary",
"room %s is unpeekable and user %s is not a member / not allowed to join, omitting from summary",
room_id,
requester,
)
@ -395,6 +522,15 @@ class SpaceSummaryHandler:
if not room_type:
room_type = create_event.content.get(EventContentFields.MSC1772_ROOM_TYPE)
room_version = await self._store.get_room_version(room_id)
allowed_spaces = None
if await self._event_auth_handler.has_restricted_join_rules(
current_state_ids, room_version
):
allowed_spaces = await self._event_auth_handler.get_spaces_that_allow_join(
current_state_ids
)
entry = {
"room_id": stats["room_id"],
"name": stats["name"],
@ -408,6 +544,7 @@ class SpaceSummaryHandler:
"guest_can_join": stats["guest_access"] == "can_join",
"creation_ts": create_event.origin_server_ts,
"room_type": room_type,
"allowed_spaces": allowed_spaces,
}
# Filter out Nones – rather omit the field altogether