mirror of
https://gitlab.computer.surgery/matrix/grapevine.git
synced 2025-12-17 07:41:23 +01:00
2032 lines
72 KiB
Rust
2032 lines
72 KiB
Rust
/// An async function that can recursively call itself.
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type AsyncRecursiveType<'a, T> = Pin<Box<dyn Future<Output = T> + 'a + Send>>;
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use std::{
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collections::{hash_map, BTreeMap, HashMap, HashSet},
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pin::Pin,
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sync::Arc,
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time::{Duration, Instant, SystemTime},
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};
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use futures_util::{stream::FuturesUnordered, Future, StreamExt};
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use ruma::{
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api::{
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client::error::ErrorKind,
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federation::{
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discovery::{
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get_remote_server_keys,
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get_remote_server_keys_batch::{self, v2::QueryCriteria},
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get_server_keys,
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},
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event::{get_event, get_room_state_ids},
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membership::create_join_event,
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},
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},
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events::{
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room::{
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create::RoomCreateEventContent,
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redaction::RoomRedactionEventContent,
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server_acl::RoomServerAclEventContent,
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},
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StateEventType, TimelineEventType,
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},
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int,
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serde::Base64,
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state_res::{self, RoomVersion, StateMap},
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uint, CanonicalJsonObject, CanonicalJsonValue, EventId,
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MilliSecondsSinceUnixEpoch, OwnedServerName, OwnedServerSigningKeyId,
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RoomId, RoomVersionId, ServerName,
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};
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use serde_json::value::RawValue as RawJsonValue;
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use tokio::sync::{RwLock, RwLockWriteGuard, Semaphore};
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use tracing::{debug, error, info, trace, warn};
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use super::state_compressor::CompressedStateEvent;
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use crate::{
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service::pdu, services, utils::debug_slice_truncated, Error, PduEvent,
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Result,
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};
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pub(crate) struct Service;
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impl Service {
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/// When receiving an event one needs to:
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/// 0. Check the server is in the room
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/// 1. Skip the PDU if we already know about it
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/// 1.1. Remove unsigned field
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/// 2. Check signatures, otherwise drop
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/// 3. Check content hash, redact if doesn't match
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/// 4. Fetch any missing auth events doing all checks listed here starting
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/// at 1. These are not timeline events
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/// 5. Reject "due to auth events" if can't get all the auth events or some
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/// of the auth events are also rejected "due to auth events"
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/// 6. Reject "due to auth events" if the event doesn't pass auth based on
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/// the auth events
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/// 7. Persist this event as an outlier
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/// 8. If not timeline event: stop
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/// 9. Fetch any missing prev events doing all checks listed here starting
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/// at 1. These are timeline events
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/// 10. Fetch missing state and auth chain events by calling /state_ids at
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/// backwards extremities doing all the checks in this list starting at
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/// 1. These are not timeline events
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/// 11. Check the auth of the event passes based on the state of the event
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/// 12. Ensure that the state is derived from the previous current state
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/// (i.e. we calculated by doing state res where one of the inputs was a
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/// previously trusted set of state, don't just trust a set of state we
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/// got from a remote)
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/// 13. Use state resolution to find new room state
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/// 14. Check if the event passes auth based on the "current state" of the
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/// room, if not soft fail it
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// We use some AsyncRecursiveType hacks here so we can call this async
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// funtion recursively
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#[tracing::instrument(skip(self, value, is_timeline_event, pub_key_map))]
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pub(crate) async fn handle_incoming_pdu<'a>(
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&self,
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origin: &'a ServerName,
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event_id: &'a EventId,
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room_id: &'a RoomId,
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value: BTreeMap<String, CanonicalJsonValue>,
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is_timeline_event: bool,
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pub_key_map: &'a RwLock<BTreeMap<String, BTreeMap<String, Base64>>>,
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) -> Result<Option<Vec<u8>>> {
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// 0. Check the server is in the room
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if !services().rooms.metadata.exists(room_id)? {
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return Err(Error::BadRequest(
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ErrorKind::NotFound,
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"Room is unknown to this server",
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));
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}
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if services().rooms.metadata.is_disabled(room_id)? {
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return Err(Error::BadRequest(
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ErrorKind::forbidden(),
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"Federation of this room is currently disabled on this server.",
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));
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}
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services().rooms.event_handler.acl_check(origin, room_id)?;
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// 1. Skip the PDU if we already have it as a timeline event
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if let Some(pdu_id) = services().rooms.timeline.get_pdu_id(event_id)? {
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return Ok(Some(pdu_id.clone()));
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}
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let create_event = services()
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.rooms
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.state_accessor
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.room_state_get(room_id, &StateEventType::RoomCreate, "")?
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.ok_or_else(|| {
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Error::bad_database("Failed to find create event in db.")
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})?;
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let create_event_content: RoomCreateEventContent =
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serde_json::from_str(create_event.content.get()).map_err(|e| {
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error!("Invalid create event: {}", e);
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Error::BadDatabase("Invalid create event in db")
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})?;
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let room_version_id = &create_event_content.room_version;
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let first_pdu_in_room =
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services().rooms.timeline.first_pdu_in_room(room_id)?.ok_or_else(
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|| Error::bad_database("Failed to find first pdu in db."),
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)?;
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let (incoming_pdu, val) = self
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.handle_outlier_pdu(
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origin,
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&create_event,
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event_id,
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room_id,
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value,
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false,
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pub_key_map,
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)
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.await?;
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Self::check_room_id(room_id, &incoming_pdu)?;
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// 8. if not timeline event: stop
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if !is_timeline_event {
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return Ok(None);
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}
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// Skip old events
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if incoming_pdu.origin_server_ts < first_pdu_in_room.origin_server_ts {
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return Ok(None);
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}
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// 9. Fetch any missing prev events doing all checks listed here
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// starting at 1. These are timeline events
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let (sorted_prev_events, mut eventid_info) = self
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.fetch_unknown_prev_events(
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origin,
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&create_event,
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room_id,
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room_version_id,
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pub_key_map,
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incoming_pdu.prev_events.clone(),
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)
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.await?;
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let mut errors = 0;
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debug!(events = ?sorted_prev_events, "Got previous events");
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for prev_id in sorted_prev_events {
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// Check for disabled again because it might have changed
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if services().rooms.metadata.is_disabled(room_id)? {
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return Err(Error::BadRequest(
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ErrorKind::forbidden(),
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"Federation of this room is currently disabled on this \
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server.",
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));
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}
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if let Some((time, tries)) = services()
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.globals
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.bad_event_ratelimiter
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.read()
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.await
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.get(&*prev_id)
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{
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// Exponential backoff
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let mut min_elapsed_duration =
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Duration::from_secs(5 * 60) * (*tries) * (*tries);
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if min_elapsed_duration > Duration::from_secs(60 * 60 * 24) {
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min_elapsed_duration = Duration::from_secs(60 * 60 * 24);
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}
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if time.elapsed() < min_elapsed_duration {
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info!("Backing off from {}", prev_id);
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continue;
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}
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}
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if errors >= 5 {
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// Timeout other events
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match services()
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.globals
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.bad_event_ratelimiter
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.write()
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.await
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.entry((*prev_id).to_owned())
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{
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hash_map::Entry::Vacant(e) => {
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e.insert((Instant::now(), 1));
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}
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hash_map::Entry::Occupied(mut e) => {
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*e.get_mut() = (Instant::now(), e.get().1 + 1);
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}
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}
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continue;
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}
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if let Some((pdu, json)) = eventid_info.remove(&*prev_id) {
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// Skip old events
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if pdu.origin_server_ts < first_pdu_in_room.origin_server_ts {
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continue;
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}
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let start_time = Instant::now();
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services()
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.globals
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.roomid_federationhandletime
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.write()
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.await
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.insert(
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room_id.to_owned(),
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((*prev_id).to_owned(), start_time),
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);
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if let Err(e) = self
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.upgrade_outlier_to_timeline_pdu(
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pdu,
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json,
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&create_event,
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origin,
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room_id,
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pub_key_map,
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)
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.await
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{
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errors += 1;
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warn!("Prev event {} failed: {}", prev_id, e);
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match services()
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.globals
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.bad_event_ratelimiter
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.write()
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.await
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.entry((*prev_id).to_owned())
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{
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hash_map::Entry::Vacant(e) => {
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e.insert((Instant::now(), 1));
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}
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hash_map::Entry::Occupied(mut e) => {
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*e.get_mut() = (Instant::now(), e.get().1 + 1);
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}
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}
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}
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let elapsed = start_time.elapsed();
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services()
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.globals
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.roomid_federationhandletime
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.write()
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.await
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.remove(&room_id.to_owned());
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debug!(
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"Handling prev event {} took {}m{}s",
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prev_id,
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elapsed.as_secs() / 60,
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elapsed.as_secs() % 60
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);
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}
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}
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// Done with prev events, now handling the incoming event
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let start_time = Instant::now();
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services()
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.globals
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.roomid_federationhandletime
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.write()
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.await
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.insert(room_id.to_owned(), (event_id.to_owned(), start_time));
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let r = services()
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.rooms
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.event_handler
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.upgrade_outlier_to_timeline_pdu(
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incoming_pdu,
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val,
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&create_event,
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origin,
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room_id,
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pub_key_map,
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)
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.await;
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services()
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.globals
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.roomid_federationhandletime
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.write()
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.await
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.remove(&room_id.to_owned());
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r
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}
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#[allow(clippy::type_complexity, clippy::too_many_arguments)]
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#[tracing::instrument(skip(self, origin, room_id, value, pub_key_map))]
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fn handle_outlier_pdu<'a>(
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&'a self,
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origin: &'a ServerName,
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create_event: &'a PduEvent,
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event_id: &'a EventId,
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room_id: &'a RoomId,
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mut value: BTreeMap<String, CanonicalJsonValue>,
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auth_events_known: bool,
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pub_key_map: &'a RwLock<BTreeMap<String, BTreeMap<String, Base64>>>,
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) -> AsyncRecursiveType<
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'a,
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Result<(Arc<PduEvent>, BTreeMap<String, CanonicalJsonValue>)>,
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> {
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Box::pin(async move {
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// 1.1. Remove unsigned field
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value.remove("unsigned");
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// TODO: For RoomVersion6 we must check that Raw<..> is canonical do we anywhere?: https://matrix.org/docs/spec/rooms/v6#canonical-json
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// We go through all the signatures we see on the value and fetch
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// the corresponding signing keys
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self.fetch_required_signing_keys(&value, pub_key_map).await?;
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// 2. Check signatures, otherwise drop
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// 3. check content hash, redact if doesn't match
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let create_event_content: RoomCreateEventContent =
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serde_json::from_str(create_event.content.get()).map_err(
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|e| {
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error!("Invalid create event: {}", e);
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Error::BadDatabase("Invalid create event in db")
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},
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)?;
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let room_version_id = &create_event_content.room_version;
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let room_version = RoomVersion::new(room_version_id)
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.expect("room version is supported");
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let guard = pub_key_map.read().await;
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let mut val = match ruma::signatures::verify_event(
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&guard,
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&value,
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room_version_id,
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) {
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Err(e) => {
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// Drop
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warn!("Dropping bad event {}: {}", event_id, e,);
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return Err(Error::BadRequest(
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ErrorKind::InvalidParam,
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"Signature verification failed",
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));
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}
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Ok(ruma::signatures::Verified::Signatures) => {
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// Redact
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warn!("Calculated hash does not match: {}", event_id);
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let Ok(obj) = ruma::canonical_json::redact(
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value,
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room_version_id,
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None,
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) else {
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return Err(Error::BadRequest(
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ErrorKind::InvalidParam,
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"Redaction failed",
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));
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};
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// Skip the PDU if it is redacted and we already have it as
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// an outlier event
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if services()
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.rooms
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.timeline
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.get_pdu_json(event_id)?
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.is_some()
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{
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return Err(Error::BadRequest(
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ErrorKind::InvalidParam,
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"Event was redacted and we already knew about it",
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));
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}
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obj
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}
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Ok(ruma::signatures::Verified::All) => value,
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};
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drop(guard);
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// Now that we have checked the signature and hashes we can add the
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// eventID and convert to our PduEvent type
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val.insert(
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"event_id".to_owned(),
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CanonicalJsonValue::String(event_id.as_str().to_owned()),
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);
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let incoming_pdu = serde_json::from_value::<PduEvent>(
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serde_json::to_value(&val)
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.expect("CanonicalJsonObj is a valid JsonValue"),
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)
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.map_err(|_| Error::bad_database("Event is not a valid PDU."))?;
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Self::check_room_id(room_id, &incoming_pdu)?;
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|
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if !auth_events_known {
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// 4. fetch any missing auth events doing all checks listed here
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// starting at 1. These are not timeline events
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// 5. Reject "due to auth events" if can't get all the auth
|
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// events or some of the auth events are also rejected "due
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// to auth events"
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// NOTE: Step 5 is not applied anymore because it failed too
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// often
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debug!(event_id = ?incoming_pdu.event_id, "Fetching auth events");
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self.fetch_and_handle_outliers(
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origin,
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&incoming_pdu
|
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.auth_events
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.iter()
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.map(|x| Arc::from(&**x))
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.collect::<Vec<_>>(),
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create_event,
|
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room_id,
|
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room_version_id,
|
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pub_key_map,
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)
|
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.await;
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}
|
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|
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// 6. Reject "due to auth events" if the event doesn't pass auth
|
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// based on the auth events
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debug!(
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"Auth check for {} based on auth events",
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incoming_pdu.event_id
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);
|
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|
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// Build map of auth events
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let mut auth_events = HashMap::new();
|
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for id in &incoming_pdu.auth_events {
|
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let Some(auth_event) = services().rooms.timeline.get_pdu(id)?
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else {
|
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warn!("Could not find auth event {}", id);
|
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continue;
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};
|
|
|
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Self::check_room_id(room_id, &auth_event)?;
|
|
|
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match auth_events.entry((
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auth_event.kind.to_string().into(),
|
|
auth_event
|
|
.state_key
|
|
.clone()
|
|
.expect("all auth events have state keys"),
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)) {
|
|
hash_map::Entry::Vacant(v) => {
|
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v.insert(auth_event);
|
|
}
|
|
hash_map::Entry::Occupied(_) => {
|
|
return Err(Error::BadRequest(
|
|
ErrorKind::InvalidParam,
|
|
"Auth event's type and state_key combination \
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|
exists multiple times.",
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));
|
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}
|
|
}
|
|
}
|
|
|
|
// The original create event must be in the auth events
|
|
if !matches!(
|
|
auth_events.get(&(StateEventType::RoomCreate, String::new())),
|
|
Some(_) | None
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|
) {
|
|
return Err(Error::BadRequest(
|
|
ErrorKind::InvalidParam,
|
|
"Incoming event refers to wrong create event.",
|
|
));
|
|
}
|
|
|
|
if !state_res::event_auth::auth_check(
|
|
&room_version,
|
|
&incoming_pdu,
|
|
// TODO: third party invite
|
|
None::<PduEvent>,
|
|
|k, s| auth_events.get(&(k.to_string().into(), s.to_owned())),
|
|
)
|
|
.map_err(|_e| {
|
|
Error::BadRequest(ErrorKind::InvalidParam, "Auth check failed")
|
|
})? {
|
|
return Err(Error::BadRequest(
|
|
ErrorKind::InvalidParam,
|
|
"Auth check failed",
|
|
));
|
|
}
|
|
|
|
debug!("Validation successful.");
|
|
|
|
// 7. Persist the event as an outlier.
|
|
services()
|
|
.rooms
|
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.outlier
|
|
.add_pdu_outlier(&incoming_pdu.event_id, &val)?;
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|
|
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debug!("Added pdu as outlier.");
|
|
|
|
Ok((Arc::new(incoming_pdu), val))
|
|
})
|
|
}
|
|
|
|
#[tracing::instrument(skip_all, fields(
|
|
incoming_pdu = %incoming_pdu.event_id,
|
|
create_event = %create_event.event_id,
|
|
))]
|
|
pub(crate) async fn upgrade_outlier_to_timeline_pdu(
|
|
&self,
|
|
incoming_pdu: Arc<PduEvent>,
|
|
val: BTreeMap<String, CanonicalJsonValue>,
|
|
create_event: &PduEvent,
|
|
origin: &ServerName,
|
|
room_id: &RoomId,
|
|
pub_key_map: &RwLock<BTreeMap<String, BTreeMap<String, Base64>>>,
|
|
) -> Result<Option<Vec<u8>>> {
|
|
// Skip the PDU if we already have it as a timeline event
|
|
if let Ok(Some(pduid)) =
|
|
services().rooms.timeline.get_pdu_id(&incoming_pdu.event_id)
|
|
{
|
|
return Ok(Some(pduid));
|
|
}
|
|
|
|
if services()
|
|
.rooms
|
|
.pdu_metadata
|
|
.is_event_soft_failed(&incoming_pdu.event_id)?
|
|
{
|
|
return Err(Error::BadRequest(
|
|
ErrorKind::InvalidParam,
|
|
"Event has been soft failed",
|
|
));
|
|
}
|
|
|
|
info!("Upgrading {} to timeline pdu", incoming_pdu.event_id);
|
|
|
|
let create_event_content: RoomCreateEventContent =
|
|
serde_json::from_str(create_event.content.get()).map_err(|e| {
|
|
warn!("Invalid create event: {}", e);
|
|
Error::BadDatabase("Invalid create event in db")
|
|
})?;
|
|
|
|
let room_version_id = &create_event_content.room_version;
|
|
let room_version = RoomVersion::new(room_version_id)
|
|
.expect("room version is supported");
|
|
|
|
// 10. Fetch missing state and auth chain events by calling /state_ids
|
|
// at backwards extremities doing all the checks in this list
|
|
// starting at 1. These are not timeline events.
|
|
|
|
// TODO: if we know the prev_events of the incoming event we can avoid
|
|
// the request and build the state from a known point and
|
|
// resolve if > 1 prev_event
|
|
|
|
debug!("Requesting state at event");
|
|
let mut state_at_incoming_event = None;
|
|
|
|
if incoming_pdu.prev_events.len() == 1 {
|
|
let prev_event = &*incoming_pdu.prev_events[0];
|
|
let prev_event_sstatehash = services()
|
|
.rooms
|
|
.state_accessor
|
|
.pdu_shortstatehash(prev_event)?;
|
|
|
|
let state = if let Some(shortstatehash) = prev_event_sstatehash {
|
|
Some(
|
|
services()
|
|
.rooms
|
|
.state_accessor
|
|
.state_full_ids(shortstatehash)
|
|
.await,
|
|
)
|
|
} else {
|
|
None
|
|
};
|
|
|
|
if let Some(Ok(mut state)) = state {
|
|
debug!("Using cached state");
|
|
let prev_pdu = services()
|
|
.rooms
|
|
.timeline
|
|
.get_pdu(prev_event)
|
|
.ok()
|
|
.flatten()
|
|
.ok_or_else(|| {
|
|
Error::bad_database(
|
|
"Could not find prev event, but we know the state.",
|
|
)
|
|
})?;
|
|
|
|
if let Some(state_key) = &prev_pdu.state_key {
|
|
let shortstatekey =
|
|
services().rooms.short.get_or_create_shortstatekey(
|
|
&prev_pdu.kind.to_string().into(),
|
|
state_key,
|
|
)?;
|
|
|
|
state.insert(shortstatekey, Arc::from(prev_event));
|
|
// Now it's the state after the pdu
|
|
}
|
|
|
|
state_at_incoming_event = Some(state);
|
|
}
|
|
} else {
|
|
debug!("Calculating state at event using state res");
|
|
let mut extremity_sstatehashes = HashMap::new();
|
|
|
|
let mut okay = true;
|
|
for prev_eventid in &incoming_pdu.prev_events {
|
|
let Ok(Some(prev_event)) =
|
|
services().rooms.timeline.get_pdu(prev_eventid)
|
|
else {
|
|
okay = false;
|
|
break;
|
|
};
|
|
|
|
let Ok(Some(sstatehash)) = services()
|
|
.rooms
|
|
.state_accessor
|
|
.pdu_shortstatehash(prev_eventid)
|
|
else {
|
|
okay = false;
|
|
break;
|
|
};
|
|
|
|
extremity_sstatehashes.insert(sstatehash, prev_event);
|
|
}
|
|
|
|
if okay {
|
|
let mut fork_states =
|
|
Vec::with_capacity(extremity_sstatehashes.len());
|
|
let mut auth_chain_sets =
|
|
Vec::with_capacity(extremity_sstatehashes.len());
|
|
|
|
for (sstatehash, prev_event) in extremity_sstatehashes {
|
|
let mut leaf_state: HashMap<_, _> = services()
|
|
.rooms
|
|
.state_accessor
|
|
.state_full_ids(sstatehash)
|
|
.await?;
|
|
|
|
if let Some(state_key) = &prev_event.state_key {
|
|
let shortstatekey = services()
|
|
.rooms
|
|
.short
|
|
.get_or_create_shortstatekey(
|
|
&prev_event.kind.to_string().into(),
|
|
state_key,
|
|
)?;
|
|
leaf_state.insert(
|
|
shortstatekey,
|
|
Arc::from(&*prev_event.event_id),
|
|
);
|
|
// Now it's the state after the pdu
|
|
}
|
|
|
|
let mut state = StateMap::with_capacity(leaf_state.len());
|
|
let mut starting_events =
|
|
Vec::with_capacity(leaf_state.len());
|
|
|
|
for (k, id) in leaf_state {
|
|
if let Ok((ty, st_key)) =
|
|
services().rooms.short.get_statekey_from_short(k)
|
|
{
|
|
// FIXME: Undo .to_string().into() when StateMap
|
|
// is updated to use StateEventType
|
|
state.insert(
|
|
(ty.to_string().into(), st_key),
|
|
id.clone(),
|
|
);
|
|
} else {
|
|
warn!("Failed to get_statekey_from_short.");
|
|
}
|
|
starting_events.push(id);
|
|
}
|
|
|
|
auth_chain_sets.push(
|
|
services()
|
|
.rooms
|
|
.auth_chain
|
|
.get_auth_chain(room_id, starting_events)
|
|
.await?
|
|
.collect(),
|
|
);
|
|
|
|
fork_states.push(state);
|
|
}
|
|
|
|
let lock = services().globals.stateres_mutex.lock();
|
|
|
|
let result = state_res::resolve(
|
|
room_version_id,
|
|
&fork_states,
|
|
auth_chain_sets,
|
|
|id| {
|
|
let res = services().rooms.timeline.get_pdu(id);
|
|
if let Err(e) = &res {
|
|
error!("LOOK AT ME Failed to fetch event: {}", e);
|
|
}
|
|
res.ok().flatten()
|
|
},
|
|
);
|
|
drop(lock);
|
|
|
|
state_at_incoming_event = match result {
|
|
Ok(new_state) => Some(
|
|
new_state
|
|
.into_iter()
|
|
.map(|((event_type, state_key), event_id)| {
|
|
let shortstatekey = services()
|
|
.rooms
|
|
.short
|
|
.get_or_create_shortstatekey(
|
|
&event_type.to_string().into(),
|
|
&state_key,
|
|
)?;
|
|
Ok((shortstatekey, event_id))
|
|
})
|
|
.collect::<Result<_>>()?,
|
|
),
|
|
Err(e) => {
|
|
warn!(
|
|
"State resolution on prev events failed, either \
|
|
an event could not be found or deserialization: \
|
|
{}",
|
|
e
|
|
);
|
|
None
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if state_at_incoming_event.is_none() {
|
|
debug!("Calling /state_ids");
|
|
// Call /state_ids to find out what the state at this pdu is. We
|
|
// trust the server's response to some extend, but we
|
|
// still do a lot of checks on the events
|
|
match services()
|
|
.sending
|
|
.send_federation_request(
|
|
origin,
|
|
get_room_state_ids::v1::Request {
|
|
room_id: room_id.to_owned(),
|
|
event_id: (*incoming_pdu.event_id).to_owned(),
|
|
},
|
|
)
|
|
.await
|
|
{
|
|
Ok(res) => {
|
|
debug!("Fetching state events at event.");
|
|
let collect = res
|
|
.pdu_ids
|
|
.iter()
|
|
.map(|x| Arc::from(&**x))
|
|
.collect::<Vec<_>>();
|
|
let state_vec = self
|
|
.fetch_and_handle_outliers(
|
|
origin,
|
|
&collect,
|
|
create_event,
|
|
room_id,
|
|
room_version_id,
|
|
pub_key_map,
|
|
)
|
|
.await;
|
|
|
|
let mut state: HashMap<_, Arc<EventId>> = HashMap::new();
|
|
for (pdu, _) in state_vec {
|
|
let state_key =
|
|
pdu.state_key.clone().ok_or_else(|| {
|
|
Error::bad_database(
|
|
"Found non-state pdu in state events.",
|
|
)
|
|
})?;
|
|
|
|
let shortstatekey = services()
|
|
.rooms
|
|
.short
|
|
.get_or_create_shortstatekey(
|
|
&pdu.kind.to_string().into(),
|
|
&state_key,
|
|
)?;
|
|
|
|
match state.entry(shortstatekey) {
|
|
hash_map::Entry::Vacant(v) => {
|
|
v.insert(Arc::from(&*pdu.event_id));
|
|
}
|
|
hash_map::Entry::Occupied(_) => {
|
|
return Err(Error::bad_database(
|
|
"State event's type and state_key \
|
|
combination exists multiple times.",
|
|
))
|
|
}
|
|
}
|
|
}
|
|
|
|
// The original create event must still be in the state
|
|
let create_shortstatekey = services()
|
|
.rooms
|
|
.short
|
|
.get_shortstatekey(&StateEventType::RoomCreate, "")?
|
|
.expect("Room exists");
|
|
|
|
if state.get(&create_shortstatekey)
|
|
!= Some(&create_event.event_id)
|
|
{
|
|
return Err(Error::bad_database(
|
|
"Incoming event refers to wrong create event.",
|
|
));
|
|
}
|
|
|
|
state_at_incoming_event = Some(state);
|
|
}
|
|
Err(e) => {
|
|
warn!("Fetching state for event failed: {}", e);
|
|
return Err(e);
|
|
}
|
|
};
|
|
}
|
|
|
|
let state_at_incoming_event =
|
|
state_at_incoming_event.expect("we always set this to some above");
|
|
|
|
debug!("Starting auth check");
|
|
// 11. Check the auth of the event passes based on the state of the
|
|
// event
|
|
let check_result = state_res::event_auth::auth_check(
|
|
&room_version,
|
|
&incoming_pdu,
|
|
// TODO: third party invite
|
|
None::<PduEvent>,
|
|
|k, s| {
|
|
services()
|
|
.rooms
|
|
.short
|
|
.get_shortstatekey(&k.to_string().into(), s)
|
|
.ok()
|
|
.flatten()
|
|
.and_then(|shortstatekey| {
|
|
state_at_incoming_event.get(&shortstatekey)
|
|
})
|
|
.and_then(|event_id| {
|
|
services()
|
|
.rooms
|
|
.timeline
|
|
.get_pdu(event_id)
|
|
.ok()
|
|
.flatten()
|
|
})
|
|
},
|
|
)
|
|
.map_err(|_e| {
|
|
Error::BadRequest(ErrorKind::InvalidParam, "Auth check failed.")
|
|
})?;
|
|
|
|
if !check_result {
|
|
return Err(Error::bad_database(
|
|
"Event has failed auth check with state at the event.",
|
|
));
|
|
}
|
|
debug!("Auth check succeeded");
|
|
|
|
// Soft fail check before doing state res
|
|
let auth_events = services().rooms.state.get_auth_events(
|
|
room_id,
|
|
&incoming_pdu.kind,
|
|
&incoming_pdu.sender,
|
|
incoming_pdu.state_key.as_deref(),
|
|
&incoming_pdu.content,
|
|
)?;
|
|
|
|
let soft_fail = !state_res::event_auth::auth_check(
|
|
&room_version,
|
|
&incoming_pdu,
|
|
None::<PduEvent>,
|
|
|k, s| auth_events.get(&(k.clone(), s.to_owned())),
|
|
)
|
|
.map_err(|_e| {
|
|
Error::BadRequest(ErrorKind::InvalidParam, "Auth check failed.")
|
|
})? || incoming_pdu.kind
|
|
== TimelineEventType::RoomRedaction
|
|
&& match room_version_id {
|
|
RoomVersionId::V1
|
|
| RoomVersionId::V2
|
|
| RoomVersionId::V3
|
|
| RoomVersionId::V4
|
|
| RoomVersionId::V5
|
|
| RoomVersionId::V6
|
|
| RoomVersionId::V7
|
|
| RoomVersionId::V8
|
|
| RoomVersionId::V9
|
|
| RoomVersionId::V10 => {
|
|
if let Some(redact_id) = &incoming_pdu.redacts {
|
|
!services().rooms.state_accessor.user_can_redact(
|
|
redact_id,
|
|
&incoming_pdu.sender,
|
|
&incoming_pdu.room_id,
|
|
true,
|
|
)?
|
|
} else {
|
|
false
|
|
}
|
|
}
|
|
RoomVersionId::V11 => {
|
|
let content = serde_json::from_str::<
|
|
RoomRedactionEventContent,
|
|
>(
|
|
incoming_pdu.content.get()
|
|
)
|
|
.map_err(|_| {
|
|
Error::bad_database("Invalid content in redaction pdu.")
|
|
})?;
|
|
|
|
if let Some(redact_id) = &content.redacts {
|
|
!services().rooms.state_accessor.user_can_redact(
|
|
redact_id,
|
|
&incoming_pdu.sender,
|
|
&incoming_pdu.room_id,
|
|
true,
|
|
)?
|
|
} else {
|
|
false
|
|
}
|
|
}
|
|
_ => {
|
|
unreachable!("Validity of room version already checked")
|
|
}
|
|
};
|
|
|
|
// 13. Use state resolution to find new room state
|
|
|
|
// We start looking at current room state now, so lets lock the room
|
|
let mutex_state = Arc::clone(
|
|
services()
|
|
.globals
|
|
.roomid_mutex_state
|
|
.write()
|
|
.await
|
|
.entry(room_id.to_owned())
|
|
.or_default(),
|
|
);
|
|
let state_lock = mutex_state.lock().await;
|
|
|
|
// Now we calculate the set of extremities this room has after the
|
|
// incoming event has been applied. We start with the previous
|
|
// extremities (aka leaves)
|
|
debug!("Calculating extremities");
|
|
let mut extremities =
|
|
services().rooms.state.get_forward_extremities(room_id)?;
|
|
|
|
// Remove any forward extremities that are referenced by this incoming
|
|
// event's prev_events
|
|
for prev_event in &incoming_pdu.prev_events {
|
|
if extremities.contains(prev_event) {
|
|
extremities.remove(prev_event);
|
|
}
|
|
}
|
|
|
|
// Only keep those extremities were not referenced yet
|
|
extremities.retain(|id| {
|
|
!matches!(
|
|
services().rooms.pdu_metadata.is_event_referenced(room_id, id),
|
|
Ok(true)
|
|
)
|
|
});
|
|
|
|
debug!("Compressing state at event");
|
|
let state_ids_compressed = Arc::new(
|
|
state_at_incoming_event
|
|
.iter()
|
|
.map(|(shortstatekey, id)| {
|
|
services()
|
|
.rooms
|
|
.state_compressor
|
|
.compress_state_event(*shortstatekey, id)
|
|
})
|
|
.collect::<Result<_>>()?,
|
|
);
|
|
|
|
if incoming_pdu.state_key.is_some() {
|
|
debug!("Preparing for stateres to derive new room state");
|
|
|
|
// We also add state after incoming event to the fork states
|
|
let mut state_after = state_at_incoming_event.clone();
|
|
if let Some(state_key) = &incoming_pdu.state_key {
|
|
let shortstatekey =
|
|
services().rooms.short.get_or_create_shortstatekey(
|
|
&incoming_pdu.kind.to_string().into(),
|
|
state_key,
|
|
)?;
|
|
|
|
state_after
|
|
.insert(shortstatekey, Arc::from(&*incoming_pdu.event_id));
|
|
}
|
|
|
|
let new_room_state = self
|
|
.resolve_state(room_id, room_version_id, state_after)
|
|
.await?;
|
|
|
|
// Set the new room state to the resolved state
|
|
debug!("Forcing new room state");
|
|
|
|
let (sstatehash, new, removed) = services()
|
|
.rooms
|
|
.state_compressor
|
|
.save_state(room_id, new_room_state)?;
|
|
|
|
services()
|
|
.rooms
|
|
.state
|
|
.force_state(room_id, sstatehash, new, removed, &state_lock)
|
|
.await?;
|
|
}
|
|
|
|
// 14. Check if the event passes auth based on the "current state" of
|
|
// the room, if not soft fail it
|
|
debug!("Starting soft fail auth check");
|
|
|
|
if soft_fail {
|
|
services()
|
|
.rooms
|
|
.timeline
|
|
.append_incoming_pdu(
|
|
&incoming_pdu,
|
|
val,
|
|
extremities.iter().map(|e| (**e).to_owned()).collect(),
|
|
state_ids_compressed,
|
|
soft_fail,
|
|
&state_lock,
|
|
)
|
|
.await?;
|
|
|
|
// Soft fail, we keep the event as an outlier but don't add it to
|
|
// the timeline
|
|
warn!("Event was soft failed: {:?}", incoming_pdu);
|
|
services()
|
|
.rooms
|
|
.pdu_metadata
|
|
.mark_event_soft_failed(&incoming_pdu.event_id)?;
|
|
return Err(Error::BadRequest(
|
|
ErrorKind::InvalidParam,
|
|
"Event has been soft failed",
|
|
));
|
|
}
|
|
|
|
debug!("Appending pdu to timeline");
|
|
extremities.insert(incoming_pdu.event_id.clone());
|
|
|
|
// Now that the event has passed all auth it is added into the timeline.
|
|
// We use the `state_at_event` instead of `state_after` so we accurately
|
|
// represent the state for this event.
|
|
|
|
let pdu_id = services()
|
|
.rooms
|
|
.timeline
|
|
.append_incoming_pdu(
|
|
&incoming_pdu,
|
|
val,
|
|
extremities.iter().map(|e| (**e).to_owned()).collect(),
|
|
state_ids_compressed,
|
|
soft_fail,
|
|
&state_lock,
|
|
)
|
|
.await?;
|
|
|
|
debug!("Appended incoming pdu");
|
|
|
|
// Event has passed all auth/stateres checks
|
|
drop(state_lock);
|
|
Ok(pdu_id)
|
|
}
|
|
|
|
#[tracing::instrument(skip(self, room_version_id, incoming_state))]
|
|
async fn resolve_state(
|
|
&self,
|
|
room_id: &RoomId,
|
|
room_version_id: &RoomVersionId,
|
|
incoming_state: HashMap<u64, Arc<EventId>>,
|
|
) -> Result<Arc<HashSet<CompressedStateEvent>>> {
|
|
debug!("Loading current room state ids");
|
|
let current_sstatehash = services()
|
|
.rooms
|
|
.state
|
|
.get_room_shortstatehash(room_id)?
|
|
.expect("every room has state");
|
|
|
|
let current_state_ids = services()
|
|
.rooms
|
|
.state_accessor
|
|
.state_full_ids(current_sstatehash)
|
|
.await?;
|
|
|
|
let fork_states = [current_state_ids, incoming_state];
|
|
|
|
let mut auth_chain_sets = Vec::new();
|
|
for state in &fork_states {
|
|
auth_chain_sets.push(
|
|
services()
|
|
.rooms
|
|
.auth_chain
|
|
.get_auth_chain(
|
|
room_id,
|
|
state.iter().map(|(_, id)| id.clone()).collect(),
|
|
)
|
|
.await?
|
|
.collect(),
|
|
);
|
|
}
|
|
|
|
debug!("Loading fork states");
|
|
|
|
let fork_states: Vec<_> = fork_states
|
|
.into_iter()
|
|
.map(|map| {
|
|
map.into_iter()
|
|
.filter_map(|(k, id)| {
|
|
services()
|
|
.rooms
|
|
.short
|
|
.get_statekey_from_short(k)
|
|
.map(|(ty, st_key)| {
|
|
((ty.to_string().into(), st_key), id)
|
|
})
|
|
.ok()
|
|
})
|
|
.collect::<StateMap<_>>()
|
|
})
|
|
.collect();
|
|
|
|
debug!("Resolving state");
|
|
|
|
let fetch_event = |id: &_| {
|
|
let res = services().rooms.timeline.get_pdu(id);
|
|
if let Err(e) = &res {
|
|
error!("LOOK AT ME Failed to fetch event: {}", e);
|
|
}
|
|
res.ok().flatten()
|
|
};
|
|
|
|
let lock = services().globals.stateres_mutex.lock();
|
|
let Ok(state) = state_res::resolve(
|
|
room_version_id,
|
|
&fork_states,
|
|
auth_chain_sets,
|
|
fetch_event,
|
|
) else {
|
|
return Err(Error::bad_database(
|
|
"State resolution failed, either an event could not be found \
|
|
or deserialization",
|
|
));
|
|
};
|
|
|
|
drop(lock);
|
|
|
|
debug!("State resolution done. Compressing state");
|
|
|
|
let new_room_state = state
|
|
.into_iter()
|
|
.map(|((event_type, state_key), event_id)| {
|
|
let shortstatekey =
|
|
services().rooms.short.get_or_create_shortstatekey(
|
|
&event_type.to_string().into(),
|
|
&state_key,
|
|
)?;
|
|
services()
|
|
.rooms
|
|
.state_compressor
|
|
.compress_state_event(shortstatekey, &event_id)
|
|
})
|
|
.collect::<Result<_>>()?;
|
|
|
|
Ok(Arc::new(new_room_state))
|
|
}
|
|
|
|
/// Find the event and auth it. Once the event is validated (steps 1 - 8)
|
|
/// it is appended to the outliers Tree.
|
|
///
|
|
/// Returns pdu and if we fetched it over federation the raw json.
|
|
///
|
|
/// a. Look in the main timeline (pduid_pdu tree)
|
|
/// b. Look at outlier pdu tree
|
|
/// c. Ask origin server over federation
|
|
/// d. TODO: Ask other servers over federation?
|
|
#[allow(clippy::type_complexity)]
|
|
#[tracing::instrument(skip_all)]
|
|
pub(crate) fn fetch_and_handle_outliers<'a>(
|
|
&'a self,
|
|
origin: &'a ServerName,
|
|
events: &'a [Arc<EventId>],
|
|
create_event: &'a PduEvent,
|
|
room_id: &'a RoomId,
|
|
room_version_id: &'a RoomVersionId,
|
|
pub_key_map: &'a RwLock<BTreeMap<String, BTreeMap<String, Base64>>>,
|
|
) -> AsyncRecursiveType<
|
|
'a,
|
|
Vec<(Arc<PduEvent>, Option<BTreeMap<String, CanonicalJsonValue>>)>,
|
|
> {
|
|
Box::pin(async move {
|
|
let back_off = |id| async move {
|
|
match services()
|
|
.globals
|
|
.bad_event_ratelimiter
|
|
.write()
|
|
.await
|
|
.entry(id)
|
|
{
|
|
hash_map::Entry::Vacant(e) => {
|
|
e.insert((Instant::now(), 1));
|
|
}
|
|
hash_map::Entry::Occupied(mut e) => {
|
|
*e.get_mut() = (Instant::now(), e.get().1 + 1);
|
|
}
|
|
}
|
|
};
|
|
|
|
let mut pdus = vec![];
|
|
for id in events {
|
|
// a. Look in the main timeline (pduid_pdu tree)
|
|
// b. Look at outlier pdu tree
|
|
// (get_pdu_json checks both)
|
|
if let Ok(Some(local_pdu)) =
|
|
services().rooms.timeline.get_pdu(id)
|
|
{
|
|
trace!("Found {} in db", id);
|
|
pdus.push((local_pdu, None));
|
|
continue;
|
|
}
|
|
|
|
// c. Ask origin server over federation
|
|
// We also handle its auth chain here so we don't get a stack
|
|
// overflow in handle_outlier_pdu.
|
|
let mut todo_auth_events = vec![Arc::clone(id)];
|
|
let mut events_in_reverse_order = Vec::new();
|
|
let mut events_all = HashSet::new();
|
|
let mut i = 0;
|
|
while let Some(next_id) = todo_auth_events.pop() {
|
|
if let Some((time, tries)) = services()
|
|
.globals
|
|
.bad_event_ratelimiter
|
|
.read()
|
|
.await
|
|
.get(&*next_id)
|
|
{
|
|
// Exponential backoff
|
|
let mut min_elapsed_duration =
|
|
Duration::from_secs(5 * 60) * (*tries) * (*tries);
|
|
if min_elapsed_duration
|
|
> Duration::from_secs(60 * 60 * 24)
|
|
{
|
|
min_elapsed_duration =
|
|
Duration::from_secs(60 * 60 * 24);
|
|
}
|
|
|
|
if time.elapsed() < min_elapsed_duration {
|
|
info!("Backing off from {}", next_id);
|
|
continue;
|
|
}
|
|
}
|
|
|
|
if events_all.contains(&next_id) {
|
|
continue;
|
|
}
|
|
|
|
i += 1;
|
|
if i % 100 == 0 {
|
|
tokio::task::yield_now().await;
|
|
}
|
|
|
|
if let Ok(Some(_)) =
|
|
services().rooms.timeline.get_pdu(&next_id)
|
|
{
|
|
trace!("Found {} in db", next_id);
|
|
continue;
|
|
}
|
|
|
|
info!("Fetching {} over federation.", next_id);
|
|
if let Ok(res) = services()
|
|
.sending
|
|
.send_federation_request(
|
|
origin,
|
|
get_event::v1::Request {
|
|
event_id: (*next_id).to_owned(),
|
|
},
|
|
)
|
|
.await
|
|
{
|
|
info!("Got {} over federation", next_id);
|
|
let Ok((calculated_event_id, value)) =
|
|
pdu::gen_event_id_canonical_json(
|
|
&res.pdu,
|
|
room_version_id,
|
|
)
|
|
else {
|
|
back_off((*next_id).to_owned()).await;
|
|
continue;
|
|
};
|
|
|
|
if calculated_event_id != *next_id {
|
|
warn!(
|
|
"Server didn't return event id we requested: \
|
|
requested: {}, we got {}. Event: {:?}",
|
|
next_id, calculated_event_id, &res.pdu
|
|
);
|
|
}
|
|
|
|
if let Some(auth_events) =
|
|
value.get("auth_events").and_then(|c| c.as_array())
|
|
{
|
|
for auth_event in auth_events {
|
|
if let Ok(auth_event) = serde_json::from_value(
|
|
auth_event.clone().into(),
|
|
) {
|
|
let a: Arc<EventId> = auth_event;
|
|
todo_auth_events.push(a);
|
|
} else {
|
|
warn!("Auth event id is not valid");
|
|
}
|
|
}
|
|
} else {
|
|
warn!("Auth event list invalid");
|
|
}
|
|
|
|
events_in_reverse_order.push((next_id.clone(), value));
|
|
events_all.insert(next_id);
|
|
} else {
|
|
warn!("Failed to fetch event: {}", next_id);
|
|
back_off((*next_id).to_owned()).await;
|
|
}
|
|
}
|
|
|
|
for (next_id, value) in events_in_reverse_order.iter().rev() {
|
|
if let Some((time, tries)) = services()
|
|
.globals
|
|
.bad_event_ratelimiter
|
|
.read()
|
|
.await
|
|
.get(&**next_id)
|
|
{
|
|
// Exponential backoff
|
|
let mut min_elapsed_duration =
|
|
Duration::from_secs(5 * 60) * (*tries) * (*tries);
|
|
if min_elapsed_duration
|
|
> Duration::from_secs(60 * 60 * 24)
|
|
{
|
|
min_elapsed_duration =
|
|
Duration::from_secs(60 * 60 * 24);
|
|
}
|
|
|
|
if time.elapsed() < min_elapsed_duration {
|
|
info!("Backing off from {}", next_id);
|
|
continue;
|
|
}
|
|
}
|
|
|
|
match self
|
|
.handle_outlier_pdu(
|
|
origin,
|
|
create_event,
|
|
next_id,
|
|
room_id,
|
|
value.clone(),
|
|
true,
|
|
pub_key_map,
|
|
)
|
|
.await
|
|
{
|
|
Ok((pdu, json)) => {
|
|
if next_id == id {
|
|
pdus.push((pdu, Some(json)));
|
|
}
|
|
}
|
|
Err(e) => {
|
|
warn!(
|
|
"Authentication of event {} failed: {:?}",
|
|
next_id, e
|
|
);
|
|
back_off((**next_id).to_owned()).await;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
pdus
|
|
})
|
|
}
|
|
|
|
#[tracing::instrument(skip_all)]
|
|
#[allow(clippy::type_complexity)]
|
|
async fn fetch_unknown_prev_events(
|
|
&self,
|
|
origin: &ServerName,
|
|
create_event: &PduEvent,
|
|
room_id: &RoomId,
|
|
room_version_id: &RoomVersionId,
|
|
pub_key_map: &RwLock<BTreeMap<String, BTreeMap<String, Base64>>>,
|
|
initial_set: Vec<Arc<EventId>>,
|
|
) -> Result<(
|
|
Vec<Arc<EventId>>,
|
|
HashMap<
|
|
Arc<EventId>,
|
|
(Arc<PduEvent>, BTreeMap<String, CanonicalJsonValue>),
|
|
>,
|
|
)> {
|
|
let mut graph: HashMap<Arc<EventId>, _> = HashMap::new();
|
|
let mut eventid_info = HashMap::new();
|
|
let mut todo_outlier_stack: Vec<Arc<EventId>> = initial_set;
|
|
|
|
let first_pdu_in_room =
|
|
services().rooms.timeline.first_pdu_in_room(room_id)?.ok_or_else(
|
|
|| Error::bad_database("Failed to find first pdu in db."),
|
|
)?;
|
|
|
|
let mut amount = 0;
|
|
|
|
while let Some(prev_event_id) = todo_outlier_stack.pop() {
|
|
if let Some((pdu, json_opt)) = self
|
|
.fetch_and_handle_outliers(
|
|
origin,
|
|
&[prev_event_id.clone()],
|
|
create_event,
|
|
room_id,
|
|
room_version_id,
|
|
pub_key_map,
|
|
)
|
|
.await
|
|
.pop()
|
|
{
|
|
Self::check_room_id(room_id, &pdu)?;
|
|
|
|
if amount > services().globals.max_fetch_prev_events() {
|
|
// Max limit reached
|
|
warn!("Max prev event limit reached!");
|
|
graph.insert(prev_event_id.clone(), HashSet::new());
|
|
continue;
|
|
}
|
|
|
|
if let Some(json) = json_opt.or_else(|| {
|
|
services()
|
|
.rooms
|
|
.outlier
|
|
.get_outlier_pdu_json(&prev_event_id)
|
|
.ok()
|
|
.flatten()
|
|
}) {
|
|
if pdu.origin_server_ts > first_pdu_in_room.origin_server_ts
|
|
{
|
|
amount += 1;
|
|
for prev_prev in &pdu.prev_events {
|
|
if !graph.contains_key(prev_prev) {
|
|
todo_outlier_stack.push(prev_prev.clone());
|
|
}
|
|
}
|
|
|
|
graph.insert(
|
|
prev_event_id.clone(),
|
|
pdu.prev_events.iter().cloned().collect(),
|
|
);
|
|
} else {
|
|
// Time based check failed
|
|
graph.insert(prev_event_id.clone(), HashSet::new());
|
|
}
|
|
|
|
eventid_info.insert(prev_event_id.clone(), (pdu, json));
|
|
} else {
|
|
// Get json failed, so this was not fetched over federation
|
|
graph.insert(prev_event_id.clone(), HashSet::new());
|
|
}
|
|
} else {
|
|
// Fetch and handle failed
|
|
graph.insert(prev_event_id.clone(), HashSet::new());
|
|
}
|
|
}
|
|
|
|
let sorted =
|
|
state_res::lexicographical_topological_sort(&graph, |event_id| {
|
|
// This return value is the key used for sorting events,
|
|
// events are then sorted by power level, time,
|
|
// and lexically by event_id.
|
|
Ok((
|
|
int!(0),
|
|
MilliSecondsSinceUnixEpoch(
|
|
eventid_info.get(event_id).map_or_else(
|
|
|| uint!(0),
|
|
|info| info.0.origin_server_ts,
|
|
),
|
|
),
|
|
))
|
|
})
|
|
.map_err(|_| Error::bad_database("Error sorting prev events"))?;
|
|
|
|
Ok((sorted, eventid_info))
|
|
}
|
|
|
|
#[tracing::instrument(skip_all)]
|
|
pub(crate) async fn fetch_required_signing_keys(
|
|
&self,
|
|
event: &BTreeMap<String, CanonicalJsonValue>,
|
|
pub_key_map: &RwLock<BTreeMap<String, BTreeMap<String, Base64>>>,
|
|
) -> Result<()> {
|
|
let signatures = event
|
|
.get("signatures")
|
|
.ok_or(Error::BadServerResponse(
|
|
"No signatures in server response pdu.",
|
|
))?
|
|
.as_object()
|
|
.ok_or(Error::BadServerResponse(
|
|
"Invalid signatures object in server response pdu.",
|
|
))?;
|
|
|
|
// We go through all the signatures we see on the value and fetch the
|
|
// corresponding signing keys
|
|
for (signature_server, signature) in signatures {
|
|
let signature_object =
|
|
signature.as_object().ok_or(Error::BadServerResponse(
|
|
"Invalid signatures content object in server response pdu.",
|
|
))?;
|
|
|
|
let signature_ids =
|
|
signature_object.keys().cloned().collect::<Vec<_>>();
|
|
|
|
let fetch_res = self
|
|
.fetch_signing_keys(
|
|
signature_server.as_str().try_into().map_err(|_| {
|
|
Error::BadServerResponse(
|
|
"Invalid servername in signatures of server \
|
|
response pdu.",
|
|
)
|
|
})?,
|
|
signature_ids,
|
|
)
|
|
.await;
|
|
|
|
let Ok(keys) = fetch_res else {
|
|
warn!(
|
|
"Signature verification failed: Could not fetch signing \
|
|
key.",
|
|
);
|
|
continue;
|
|
};
|
|
|
|
pub_key_map.write().await.insert(signature_server.clone(), keys);
|
|
}
|
|
|
|
Ok(())
|
|
}
|
|
|
|
// Gets a list of servers for which we don't have the signing key yet. We go
|
|
// over the PDUs and either cache the key or add it to the list that
|
|
// needs to be retrieved.
|
|
#[tracing::instrument(skip_all)]
|
|
async fn get_server_keys_from_cache(
|
|
&self,
|
|
pdu: &RawJsonValue,
|
|
servers: &mut BTreeMap<
|
|
OwnedServerName,
|
|
BTreeMap<OwnedServerSigningKeyId, QueryCriteria>,
|
|
>,
|
|
room_version: &RoomVersionId,
|
|
pub_key_map: &mut RwLockWriteGuard<
|
|
'_,
|
|
BTreeMap<String, BTreeMap<String, Base64>>,
|
|
>,
|
|
) -> Result<()> {
|
|
let value: CanonicalJsonObject = serde_json::from_str(pdu.get())
|
|
.map_err(|e| {
|
|
error!("Invalid PDU in server response: {:?}: {:?}", pdu, e);
|
|
Error::BadServerResponse("Invalid PDU in server response")
|
|
})?;
|
|
|
|
let event_id = format!(
|
|
"${}",
|
|
ruma::signatures::reference_hash(&value, room_version)
|
|
.expect("ruma can calculate reference hashes")
|
|
);
|
|
let event_id = <&EventId>::try_from(event_id.as_str())
|
|
.expect("ruma's reference hashes are valid event ids");
|
|
|
|
if let Some((time, tries)) =
|
|
services().globals.bad_event_ratelimiter.read().await.get(event_id)
|
|
{
|
|
// Exponential backoff
|
|
let mut min_elapsed_duration =
|
|
Duration::from_secs(30) * (*tries) * (*tries);
|
|
if min_elapsed_duration > Duration::from_secs(60 * 60 * 24) {
|
|
min_elapsed_duration = Duration::from_secs(60 * 60 * 24);
|
|
}
|
|
|
|
if time.elapsed() < min_elapsed_duration {
|
|
debug!("Backing off from {}", event_id);
|
|
return Err(Error::BadServerResponse(
|
|
"bad event, still backing off",
|
|
));
|
|
}
|
|
}
|
|
|
|
let signatures = value
|
|
.get("signatures")
|
|
.ok_or(Error::BadServerResponse(
|
|
"No signatures in server response pdu.",
|
|
))?
|
|
.as_object()
|
|
.ok_or(Error::BadServerResponse(
|
|
"Invalid signatures object in server response pdu.",
|
|
))?;
|
|
|
|
for (signature_server, signature) in signatures {
|
|
let signature_object =
|
|
signature.as_object().ok_or(Error::BadServerResponse(
|
|
"Invalid signatures content object in server response pdu.",
|
|
))?;
|
|
|
|
let signature_ids =
|
|
signature_object.keys().cloned().collect::<Vec<_>>();
|
|
|
|
let contains_all_ids = |keys: &BTreeMap<String, Base64>| {
|
|
signature_ids.iter().all(|id| keys.contains_key(id))
|
|
};
|
|
|
|
let origin = <&ServerName>::try_from(signature_server.as_str())
|
|
.map_err(|_| {
|
|
Error::BadServerResponse(
|
|
"Invalid servername in signatures of server response \
|
|
pdu.",
|
|
)
|
|
})?;
|
|
|
|
if servers.contains_key(origin)
|
|
|| pub_key_map.contains_key(origin.as_str())
|
|
{
|
|
continue;
|
|
}
|
|
|
|
trace!("Loading signing keys for {}", origin);
|
|
|
|
let result: BTreeMap<_, _> = services()
|
|
.globals
|
|
.signing_keys_for(origin)?
|
|
.into_iter()
|
|
.map(|(k, v)| (k.to_string(), v.key))
|
|
.collect();
|
|
|
|
if !contains_all_ids(&result) {
|
|
trace!("Signing key not loaded for {}", origin);
|
|
servers.insert(origin.to_owned(), BTreeMap::new());
|
|
}
|
|
|
|
pub_key_map.insert(origin.to_string(), result);
|
|
}
|
|
|
|
Ok(())
|
|
}
|
|
|
|
#[allow(clippy::too_many_lines)]
|
|
pub(crate) async fn fetch_join_signing_keys(
|
|
&self,
|
|
event: &create_join_event::v2::Response,
|
|
room_version: &RoomVersionId,
|
|
pub_key_map: &RwLock<BTreeMap<String, BTreeMap<String, Base64>>>,
|
|
) -> Result<()> {
|
|
let mut servers: BTreeMap<
|
|
OwnedServerName,
|
|
BTreeMap<OwnedServerSigningKeyId, QueryCriteria>,
|
|
> = BTreeMap::new();
|
|
|
|
{
|
|
let mut pkm = pub_key_map.write().await;
|
|
|
|
// Try to fetch keys, failure is okay
|
|
// Servers we couldn't find in the cache will be added to `servers`
|
|
for pdu in event
|
|
.room_state
|
|
.state
|
|
.iter()
|
|
.chain(&event.room_state.auth_chain)
|
|
{
|
|
if let Err(error) = self
|
|
.get_server_keys_from_cache(
|
|
pdu,
|
|
&mut servers,
|
|
room_version,
|
|
&mut pkm,
|
|
)
|
|
.await
|
|
{
|
|
debug!(%error, "failed to get server keys from cache");
|
|
};
|
|
}
|
|
|
|
drop(pkm);
|
|
};
|
|
|
|
if servers.is_empty() {
|
|
info!("We had all keys locally");
|
|
return Ok(());
|
|
}
|
|
|
|
for server in services().globals.trusted_servers() {
|
|
info!("Asking batch signing keys from trusted server {}", server);
|
|
if let Ok(keys) = services()
|
|
.sending
|
|
.send_federation_request(
|
|
server,
|
|
get_remote_server_keys_batch::v2::Request {
|
|
server_keys: servers.clone(),
|
|
},
|
|
)
|
|
.await
|
|
{
|
|
trace!("Got signing keys: {:?}", keys);
|
|
let mut pkm = pub_key_map.write().await;
|
|
for k in keys.server_keys {
|
|
let k = match k.deserialize() {
|
|
Ok(key) => key,
|
|
Err(e) => {
|
|
warn!(
|
|
"Received error {} while fetching keys from \
|
|
trusted server {}",
|
|
e, server
|
|
);
|
|
warn!("{}", k.into_json());
|
|
continue;
|
|
}
|
|
};
|
|
|
|
// TODO: Check signature from trusted server?
|
|
servers.remove(&k.server_name);
|
|
|
|
let result = services()
|
|
.globals
|
|
.add_signing_key(&k.server_name, k.clone())?
|
|
.into_iter()
|
|
.map(|(k, v)| (k.to_string(), v.key))
|
|
.collect::<BTreeMap<_, _>>();
|
|
|
|
pkm.insert(k.server_name.to_string(), result);
|
|
}
|
|
}
|
|
|
|
if servers.is_empty() {
|
|
info!("Trusted server supplied all signing keys");
|
|
return Ok(());
|
|
}
|
|
}
|
|
|
|
info!("Asking individual servers for signing keys: {servers:?}");
|
|
let mut futures: FuturesUnordered<_> = servers
|
|
.into_keys()
|
|
.map(|server| async move {
|
|
(
|
|
services()
|
|
.sending
|
|
.send_federation_request(
|
|
&server,
|
|
get_server_keys::v2::Request::new(),
|
|
)
|
|
.await,
|
|
server,
|
|
)
|
|
})
|
|
.collect();
|
|
|
|
while let Some(result) = futures.next().await {
|
|
info!("Received new result");
|
|
if let (Ok(get_keys_response), origin) = result {
|
|
info!("Result is from {origin}");
|
|
if let Ok(key) = get_keys_response.server_key.deserialize() {
|
|
let result: BTreeMap<_, _> = services()
|
|
.globals
|
|
.add_signing_key(&origin, key)?
|
|
.into_iter()
|
|
.map(|(k, v)| (k.to_string(), v.key))
|
|
.collect();
|
|
pub_key_map
|
|
.write()
|
|
.await
|
|
.insert(origin.to_string(), result);
|
|
}
|
|
}
|
|
info!("Done handling result");
|
|
}
|
|
|
|
info!("Search for signing keys done");
|
|
|
|
Ok(())
|
|
}
|
|
|
|
/// Returns Ok if the acl allows the server
|
|
// Allowed because this function uses `services()`
|
|
#[allow(clippy::unused_self)]
|
|
#[tracing::instrument(skip_all)]
|
|
pub(crate) fn acl_check(
|
|
&self,
|
|
server_name: &ServerName,
|
|
room_id: &RoomId,
|
|
) -> Result<()> {
|
|
let Some(acl_event) = services().rooms.state_accessor.room_state_get(
|
|
room_id,
|
|
&StateEventType::RoomServerAcl,
|
|
"",
|
|
)?
|
|
else {
|
|
return Ok(());
|
|
};
|
|
|
|
let Ok(acl_event_content) = serde_json::from_str::<
|
|
RoomServerAclEventContent,
|
|
>(acl_event.content.get()) else {
|
|
warn!("Invalid ACL event");
|
|
return Ok(());
|
|
};
|
|
|
|
if acl_event_content.allow.is_empty() {
|
|
// Ignore broken acl events
|
|
return Ok(());
|
|
}
|
|
|
|
if acl_event_content.is_allowed(server_name) {
|
|
Ok(())
|
|
} else {
|
|
info!(
|
|
"Server {} was denied by room ACL in {}",
|
|
server_name, room_id
|
|
);
|
|
Err(Error::BadRequest(
|
|
ErrorKind::forbidden(),
|
|
"Server was denied by room ACL",
|
|
))
|
|
}
|
|
}
|
|
|
|
/// Search the DB for the signing keys of the given server, if we don't have
|
|
/// them fetch them from the server and save to our DB.
|
|
#[tracing::instrument(
|
|
skip(self, signature_ids),
|
|
fields(signature_ids = debug_slice_truncated(&signature_ids, 3))
|
|
)]
|
|
pub(crate) async fn fetch_signing_keys(
|
|
&self,
|
|
origin: &ServerName,
|
|
signature_ids: Vec<String>,
|
|
) -> Result<BTreeMap<String, Base64>> {
|
|
let contains_all_ids = |keys: &BTreeMap<String, Base64>| {
|
|
signature_ids.iter().all(|id| keys.contains_key(id))
|
|
};
|
|
|
|
let permit = services()
|
|
.globals
|
|
.servername_ratelimiter
|
|
.read()
|
|
.await
|
|
.get(origin)
|
|
.map(|s| Arc::clone(s).acquire_owned());
|
|
|
|
let permit = if let Some(p) = permit {
|
|
p
|
|
} else {
|
|
let mut write =
|
|
services().globals.servername_ratelimiter.write().await;
|
|
let s = Arc::clone(
|
|
write
|
|
.entry(origin.to_owned())
|
|
.or_insert_with(|| Arc::new(Semaphore::new(1))),
|
|
);
|
|
|
|
s.acquire_owned()
|
|
}
|
|
.await;
|
|
|
|
let back_off = |id| async {
|
|
match services()
|
|
.globals
|
|
.bad_signature_ratelimiter
|
|
.write()
|
|
.await
|
|
.entry(id)
|
|
{
|
|
hash_map::Entry::Vacant(e) => {
|
|
e.insert((Instant::now(), 1));
|
|
}
|
|
hash_map::Entry::Occupied(mut e) => {
|
|
*e.get_mut() = (Instant::now(), e.get().1 + 1);
|
|
}
|
|
}
|
|
};
|
|
|
|
if let Some((time, tries)) = services()
|
|
.globals
|
|
.bad_signature_ratelimiter
|
|
.read()
|
|
.await
|
|
.get(&signature_ids)
|
|
{
|
|
// Exponential backoff
|
|
let mut min_elapsed_duration =
|
|
Duration::from_secs(30) * (*tries) * (*tries);
|
|
if min_elapsed_duration > Duration::from_secs(60 * 60 * 24) {
|
|
min_elapsed_duration = Duration::from_secs(60 * 60 * 24);
|
|
}
|
|
|
|
if time.elapsed() < min_elapsed_duration {
|
|
debug!("Backing off from {:?}", signature_ids);
|
|
return Err(Error::BadServerResponse(
|
|
"bad signature, still backing off",
|
|
));
|
|
}
|
|
}
|
|
|
|
trace!("Loading signing keys from database");
|
|
|
|
let mut result: BTreeMap<_, _> = services()
|
|
.globals
|
|
.signing_keys_for(origin)?
|
|
.into_iter()
|
|
.map(|(k, v)| (k.to_string(), v.key))
|
|
.collect();
|
|
|
|
if contains_all_ids(&result) {
|
|
return Ok(result);
|
|
}
|
|
|
|
debug!("Fetching signing keys over federation");
|
|
|
|
if let Some(server_key) = services()
|
|
.sending
|
|
.send_federation_request(
|
|
origin,
|
|
get_server_keys::v2::Request::new(),
|
|
)
|
|
.await
|
|
.ok()
|
|
.and_then(|resp| resp.server_key.deserialize().ok())
|
|
{
|
|
services().globals.add_signing_key(origin, server_key.clone())?;
|
|
|
|
result.extend(
|
|
server_key
|
|
.verify_keys
|
|
.into_iter()
|
|
.map(|(k, v)| (k.to_string(), v.key)),
|
|
);
|
|
result.extend(
|
|
server_key
|
|
.old_verify_keys
|
|
.into_iter()
|
|
.map(|(k, v)| (k.to_string(), v.key)),
|
|
);
|
|
|
|
if contains_all_ids(&result) {
|
|
return Ok(result);
|
|
}
|
|
}
|
|
|
|
for server in services().globals.trusted_servers() {
|
|
debug!(trusted_server = %server, "Asking trusted server for signing keys");
|
|
if let Some(server_keys) = services()
|
|
.sending
|
|
.send_federation_request(
|
|
server,
|
|
get_remote_server_keys::v2::Request::new(
|
|
origin.to_owned(),
|
|
MilliSecondsSinceUnixEpoch::from_system_time(
|
|
SystemTime::now()
|
|
.checked_add(Duration::from_secs(3600))
|
|
.expect("SystemTime to large"),
|
|
)
|
|
.expect("time is valid"),
|
|
),
|
|
)
|
|
.await
|
|
.ok()
|
|
.map(|resp| {
|
|
resp.server_keys
|
|
.into_iter()
|
|
.filter_map(|e| e.deserialize().ok())
|
|
.collect::<Vec<_>>()
|
|
})
|
|
{
|
|
trace!(?server_keys, "Got signing keys from trusted server");
|
|
for k in server_keys {
|
|
services().globals.add_signing_key(origin, k.clone())?;
|
|
result.extend(
|
|
k.verify_keys
|
|
.into_iter()
|
|
.map(|(k, v)| (k.to_string(), v.key)),
|
|
);
|
|
result.extend(
|
|
k.old_verify_keys
|
|
.into_iter()
|
|
.map(|(k, v)| (k.to_string(), v.key)),
|
|
);
|
|
}
|
|
|
|
if contains_all_ids(&result) {
|
|
return Ok(result);
|
|
}
|
|
}
|
|
}
|
|
|
|
drop(permit);
|
|
|
|
back_off(signature_ids).await;
|
|
|
|
warn!("Failed to find all public keys");
|
|
Err(Error::BadServerResponse("Failed to find public key for server"))
|
|
}
|
|
|
|
#[tracing::instrument(skip_all)]
|
|
fn check_room_id(room_id: &RoomId, pdu: &PduEvent) -> Result<()> {
|
|
if pdu.room_id != room_id {
|
|
warn!("Found event from room {} in room {}", pdu.room_id, room_id);
|
|
return Err(Error::BadRequest(
|
|
ErrorKind::InvalidParam,
|
|
"Event has wrong room id",
|
|
));
|
|
}
|
|
Ok(())
|
|
}
|
|
}
|