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Sort and authenticate the events from /send_join response

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Devin Ragotzy 2020-08-30 16:08:47 -04:00
parent 3b40f3d60e
commit 2a63d0955a
1 changed files with 35 additions and 14 deletions
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49
src/client_server/membership.rs
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@ -497,17 +497,18 @@ async fn join_room_by_id_helper(
.collect::<Result<BTreeMap<EventId, StateEvent>, _>>()
.map_err(|_| Error::bad_database("Invalid PDU found in db."))?;
let power_events = event_map
let control_events = event_map
.values()
.filter(|pdu| pdu.is_power_event())
.map(|pdu| pdu.event_id())
.collect::<Vec<_>>();
// TODO these events are not guaranteed to be sorted but they are resolved, do
// we need the auth_chain
let sorted_power_events = state_res::StateResolution::reverse_topological_power_sort(
// These events are not guaranteed to be sorted but they are resolved according to spec
// we auth them anyways to weed out faulty/malicious server. The following is basically the
// full state resolution algorithm.
let sorted_control_events = state_res::StateResolution::reverse_topological_power_sort(
&room_id,
&power_events,
&control_events,
&mut event_map,
&db.rooms,
&send_join_response
@ -518,26 +519,31 @@ async fn join_room_by_id_helper(
.collect::<Vec<_>>(),
);
// TODO we may be able to skip this since they are resolved according to spec
let resolved_power = state_res::StateResolution::iterative_auth_check(
// Auth check each event against the "partial" state created by the preceding events
let resolved_control_events = state_res::StateResolution::iterative_auth_check(
room_id,
&RoomVersionId::Version6,
&sorted_power_events,
&BTreeMap::new(), // unconflicted events
&sorted_control_events,
&BTreeMap::new(), // We have no "clean/resolved" events to add (these extend the `resolved_control_events`)
&mut event_map,
&db.rooms,
)
.expect("iterative auth check failed on resolved events");
// TODO do we need to dedup them
// This removes the control events that failed auth, leaving the resolved
// to be mainline sorted
let events_to_sort = event_map
.keys()
.filter(|id| !sorted_power_events.contains(id))
.filter(|id| {
!sorted_control_events.contains(id)
|| resolved_control_events.values().any(|rid| *id == rid)
})
.cloned()
.collect::<Vec<_>>();
let power_level = resolved_power.get(&(EventType::RoomPowerLevels, Some("".into())));
let power_level =
resolved_control_events.get(&(EventType::RoomPowerLevels, Some("".into())));
// Sort the remaining non control events
let sorted_event_ids = state_res::StateResolution::mainline_sort(
room_id,
&events_to_sort,
@ -546,7 +552,22 @@ async fn join_room_by_id_helper(
&db.rooms,
);
for ev_id in &sorted_event_ids {
let resolved_events = state_res::StateResolution::iterative_auth_check(
room_id,
&RoomVersionId::Version6,
&sorted_event_ids,
&resolved_control_events,
&mut event_map,
&db.rooms,
)
.expect("iterative auth check failed on resolved events");
// filter the events that failed the auth check keeping the remaining events
// sorted correctly
for ev_id in sorted_event_ids
.iter()
.filter(|id| resolved_events.values().any(|rid| rid == *id))
{
// this is a `state_res::StateEvent` that holds a `ruma::Pdu`
let pdu = event_map
.get(ev_id)