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synced 2025-05-02 14:06:02 -04:00
Improve validation for send_{join,leave,knock} (#10225)
The idea here is to stop people sending things that aren't joins/leaves/knocks through these endpoints: previously you could send anything you liked through them. I wasn't able to find any security holes from doing so, but it doesn't sound like a good thing.
This commit is contained in:
Richard van der Hoff
GitHub
parent
bd4919fb72
commit
6e8fb42be7
6 changed files with 136 additions and 187 deletions
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@ -34,7 +34,7 @@ from twisted.internet import defer
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from twisted.internet.abstract import isIPAddress
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from twisted.python import failure
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from synapse.api.constants import EduTypes, EventTypes
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from synapse.api.constants import EduTypes, EventTypes, Membership
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from synapse.api.errors import (
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AuthError,
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Codes,
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@ -46,6 +46,7 @@ from synapse.api.errors import (
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)
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from synapse.api.room_versions import KNOWN_ROOM_VERSIONS
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from synapse.events import EventBase
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from synapse.events.snapshot import EventContext
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from synapse.federation.federation_base import FederationBase, event_from_pdu_json
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from synapse.federation.persistence import TransactionActions
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from synapse.federation.units import Edu, Transaction
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@ -537,26 +538,21 @@ class FederationServer(FederationBase):
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return {"event": ret_pdu.get_pdu_json(time_now)}
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async def on_send_join_request(
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self, origin: str, content: JsonDict
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self, origin: str, content: JsonDict, room_id: str
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) -> Dict[str, Any]:
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logger.debug("on_send_join_request: content: %s", content)
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context = await self._on_send_membership_event(
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origin, content, Membership.JOIN, room_id
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)
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assert_params_in_dict(content, ["room_id"])
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room_version = await self.store.get_room_version(content["room_id"])
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pdu = event_from_pdu_json(content, room_version)
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prev_state_ids = await context.get_prev_state_ids()
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state_ids = list(prev_state_ids.values())
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auth_chain = await self.store.get_auth_chain(room_id, state_ids)
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state = await self.store.get_events(state_ids)
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origin_host, _ = parse_server_name(origin)
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await self.check_server_matches_acl(origin_host, pdu.room_id)
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logger.debug("on_send_join_request: pdu sigs: %s", pdu.signatures)
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pdu = await self._check_sigs_and_hash(room_version, pdu)
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res_pdus = await self.handler.on_send_join_request(origin, pdu)
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time_now = self._clock.time_msec()
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return {
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"state": [p.get_pdu_json(time_now) for p in res_pdus["state"]],
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"auth_chain": [p.get_pdu_json(time_now) for p in res_pdus["auth_chain"]],
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"state": [p.get_pdu_json(time_now) for p in state.values()],
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"auth_chain": [p.get_pdu_json(time_now) for p in auth_chain],
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}
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async def on_make_leave_request(
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@ -571,21 +567,11 @@ class FederationServer(FederationBase):
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time_now = self._clock.time_msec()
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return {"event": pdu.get_pdu_json(time_now), "room_version": room_version}
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async def on_send_leave_request(self, origin: str, content: JsonDict) -> dict:
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async def on_send_leave_request(
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self, origin: str, content: JsonDict, room_id: str
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) -> dict:
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logger.debug("on_send_leave_request: content: %s", content)
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assert_params_in_dict(content, ["room_id"])
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room_version = await self.store.get_room_version(content["room_id"])
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pdu = event_from_pdu_json(content, room_version)
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origin_host, _ = parse_server_name(origin)
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await self.check_server_matches_acl(origin_host, pdu.room_id)
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logger.debug("on_send_leave_request: pdu sigs: %s", pdu.signatures)
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pdu = await self._check_sigs_and_hash(room_version, pdu)
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await self.handler.on_send_leave_request(origin, pdu)
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await self._on_send_membership_event(origin, content, Membership.LEAVE, room_id)
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return {}
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async def on_make_knock_request(
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@ -651,29 +637,9 @@ class FederationServer(FederationBase):
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Returns:
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The stripped room state.
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"""
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logger.debug("on_send_knock_request: content: %s", content)
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room_version = await self.store.get_room_version(room_id)
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# Check that this room supports knocking as defined by its room version
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if not room_version.msc2403_knocking:
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raise SynapseError(
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403,
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"This room version does not support knocking",
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errcode=Codes.FORBIDDEN,
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)
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pdu = event_from_pdu_json(content, room_version)
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origin_host, _ = parse_server_name(origin)
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await self.check_server_matches_acl(origin_host, pdu.room_id)
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logger.debug("on_send_knock_request: pdu sigs: %s", pdu.signatures)
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pdu = await self._check_sigs_and_hash(room_version, pdu)
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# Handle the event, and retrieve the EventContext
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event_context = await self.handler.on_send_knock_request(origin, pdu)
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event_context = await self._on_send_membership_event(
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origin, content, Membership.KNOCK, room_id
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)
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# Retrieve stripped state events from the room and send them back to the remote
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# server. This will allow the remote server's clients to display information
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@ -685,6 +651,63 @@ class FederationServer(FederationBase):
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)
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return {"knock_state_events": stripped_room_state}
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async def _on_send_membership_event(
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self, origin: str, content: JsonDict, membership_type: str, room_id: str
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) -> EventContext:
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"""Handle an on_send_{join,leave,knock} request
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Does some preliminary validation before passing the request on to the
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federation handler.
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Args:
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origin: The (authenticated) requesting server
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content: The body of the send_* request - a complete membership event
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membership_type: The expected membership type (join or leave, depending
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on the endpoint)
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room_id: The room_id from the request, to be validated against the room_id
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in the event
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Returns:
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The context of the event after inserting it into the room graph.
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Raises:
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SynapseError if there is a problem with the request, including things like
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the room_id not matching or the event not being authorized.
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"""
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assert_params_in_dict(content, ["room_id"])
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if content["room_id"] != room_id:
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raise SynapseError(
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400,
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"Room ID in body does not match that in request path",
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Codes.BAD_JSON,
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)
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room_version = await self.store.get_room_version(room_id)
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if membership_type == Membership.KNOCK and not room_version.msc2403_knocking:
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raise SynapseError(
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403,
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"This room version does not support knocking",
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errcode=Codes.FORBIDDEN,
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)
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event = event_from_pdu_json(content, room_version)
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if event.type != EventTypes.Member or not event.is_state():
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raise SynapseError(400, "Not an m.room.member event", Codes.BAD_JSON)
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if event.content.get("membership") != membership_type:
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raise SynapseError(400, "Not a %s event" % membership_type, Codes.BAD_JSON)
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origin_host, _ = parse_server_name(origin)
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await self.check_server_matches_acl(origin_host, event.room_id)
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logger.debug("_on_send_membership_event: pdu sigs: %s", event.signatures)
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event = await self._check_sigs_and_hash(room_version, event)
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return await self.handler.on_send_membership_event(origin, event)
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async def on_event_auth(
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self, origin: str, room_id: str, event_id: str
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) -> Tuple[int, Dict[str, Any]]:
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