package internal import ( "context" "encoding/json" "errors" "fmt" "time" "github.com/matrix-org/dendrite/federationsender/api" "github.com/matrix-org/dendrite/federationsender/internal/perform" roomserverAPI "github.com/matrix-org/dendrite/roomserver/api" "github.com/matrix-org/dendrite/roomserver/version" "github.com/matrix-org/gomatrix" "github.com/matrix-org/gomatrixserverlib" "github.com/matrix-org/util" "github.com/sirupsen/logrus" ) // PerformLeaveRequest implements api.FederationSenderInternalAPI func (r *FederationSenderInternalAPI) PerformDirectoryLookup( ctx context.Context, request *api.PerformDirectoryLookupRequest, response *api.PerformDirectoryLookupResponse, ) (err error) { dir, err := r.federation.LookupRoomAlias( ctx, request.ServerName, request.RoomAlias, ) if err != nil { r.statistics.ForServer(request.ServerName).Failure() return err } response.RoomID = dir.RoomID response.ServerNames = dir.Servers r.statistics.ForServer(request.ServerName).Success() return nil } type federatedJoin struct { UserID string RoomID string } // PerformJoin implements api.FederationSenderInternalAPI func (r *FederationSenderInternalAPI) PerformJoin( ctx context.Context, request *api.PerformJoinRequest, response *api.PerformJoinResponse, ) { // Check that a join isn't already in progress for this user/room. j := federatedJoin{request.UserID, request.RoomID} if _, found := r.joins.Load(j); found { response.LastError = &gomatrix.HTTPError{ Code: 429, Message: `{ "errcode": "M_LIMIT_EXCEEDED", "error": "There is already a federated join to this room in progress. Please wait for it to finish." }`, // TODO: Why do none of our error types play nicely with each other? } return } r.joins.Store(j, nil) defer r.joins.Delete(j) // Look up the supported room versions. var supportedVersions []gomatrixserverlib.RoomVersion for version := range version.SupportedRoomVersions() { supportedVersions = append(supportedVersions, version) } // Deduplicate the server names we were provided but keep the ordering // as this encodes useful information about which servers are most likely // to respond. seenSet := make(map[gomatrixserverlib.ServerName]bool) var uniqueList []gomatrixserverlib.ServerName for _, srv := range request.ServerNames { if seenSet[srv] { continue } seenSet[srv] = true uniqueList = append(uniqueList, srv) } request.ServerNames = uniqueList // Try each server that we were provided until we land on one that // successfully completes the make-join send-join dance. var lastErr error for _, serverName := range request.ServerNames { if err := r.performJoinUsingServer( ctx, request.RoomID, request.UserID, request.Content, serverName, supportedVersions, ); err != nil { logrus.WithError(err).WithFields(logrus.Fields{ "server_name": serverName, "room_id": request.RoomID, }).Warnf("Failed to join room through server") lastErr = err continue } // We're all good. return } // If we reach here then we didn't complete a join for some reason. var httpErr gomatrix.HTTPError if ok := errors.As(lastErr, &httpErr); ok { httpErr.Message = string(httpErr.Contents) // Clear the wrapped error, else serialising to JSON (in polylith mode) will fail httpErr.WrappedError = nil response.LastError = &httpErr } else { response.LastError = &gomatrix.HTTPError{ Code: 0, WrappedError: nil, Message: "Unknown HTTP error", } if lastErr != nil { response.LastError.Message = lastErr.Error() } } logrus.Errorf( "failed to join user %q to room %q through %d server(s): last error %s", request.UserID, request.RoomID, len(request.ServerNames), lastErr, ) } func (r *FederationSenderInternalAPI) performJoinUsingServer( ctx context.Context, roomID, userID string, content map[string]interface{}, serverName gomatrixserverlib.ServerName, supportedVersions []gomatrixserverlib.RoomVersion, ) error { // Try to perform a make_join using the information supplied in the // request. respMakeJoin, err := r.federation.MakeJoin( ctx, serverName, roomID, userID, supportedVersions, ) if err != nil { // TODO: Check if the user was not allowed to join the room. r.statistics.ForServer(serverName).Failure() return fmt.Errorf("r.federation.MakeJoin: %w", err) } r.statistics.ForServer(serverName).Success() // Set all the fields to be what they should be, this should be a no-op // but it's possible that the remote server returned us something "odd" respMakeJoin.JoinEvent.Type = gomatrixserverlib.MRoomMember respMakeJoin.JoinEvent.Sender = userID respMakeJoin.JoinEvent.StateKey = &userID respMakeJoin.JoinEvent.RoomID = roomID respMakeJoin.JoinEvent.Redacts = "" if content == nil { content = map[string]interface{}{} } content["membership"] = "join" if err = respMakeJoin.JoinEvent.SetContent(content); err != nil { return fmt.Errorf("respMakeJoin.JoinEvent.SetContent: %w", err) } if err = respMakeJoin.JoinEvent.SetUnsigned(struct{}{}); err != nil { return fmt.Errorf("respMakeJoin.JoinEvent.SetUnsigned: %w", err) } // Work out if we support the room version that has been supplied in // the make_join response. // "If not provided, the room version is assumed to be either "1" or "2"." // https://matrix.org/docs/spec/server_server/unstable#get-matrix-federation-v1-make-join-roomid-userid if respMakeJoin.RoomVersion == "" { respMakeJoin.RoomVersion = setDefaultRoomVersionFromJoinEvent(respMakeJoin.JoinEvent) } if _, err = respMakeJoin.RoomVersion.EventFormat(); err != nil { return fmt.Errorf("respMakeJoin.RoomVersion.EventFormat: %w", err) } // Build the join event. event, err := respMakeJoin.JoinEvent.Build( time.Now(), r.cfg.Matrix.ServerName, r.cfg.Matrix.KeyID, r.cfg.Matrix.PrivateKey, respMakeJoin.RoomVersion, ) if err != nil { return fmt.Errorf("respMakeJoin.JoinEvent.Build: %w", err) } // No longer reuse the request context from this point forward. // We don't want the client timing out to interrupt the join. var cancel context.CancelFunc ctx, cancel = context.WithCancel(context.Background()) // Try to perform a send_join using the newly built event. respSendJoin, err := r.federation.SendJoin( ctx, serverName, event, respMakeJoin.RoomVersion, ) if err != nil { r.statistics.ForServer(serverName).Failure() cancel() return fmt.Errorf("r.federation.SendJoin: %w", err) } r.statistics.ForServer(serverName).Success() // Sanity-check the join response to ensure that it has a create // event, that the room version is known, etc. if err := sanityCheckSendJoinResponse(respSendJoin); err != nil { cancel() return fmt.Errorf("sanityCheckSendJoinResponse: %w", err) } // Process the join response in a goroutine. The idea here is // that we'll try and wait for as long as possible for the work // to complete, but if the client does give up waiting, we'll // still continue to process the join anyway so that we don't // waste the effort. go func() { defer cancel() // Check that the send_join response was valid. joinCtx := perform.JoinContext(r.federation, r.keyRing) respState, err := joinCtx.CheckSendJoinResponse( ctx, event, serverName, respMakeJoin, respSendJoin, ) if err != nil { logrus.WithFields(logrus.Fields{ "room_id": roomID, "user_id": userID, }).WithError(err).Error("Failed to process room join response") return } // If we successfully performed a send_join above then the other // server now thinks we're a part of the room. Send the newly // returned state to the roomserver to update our local view. if err = roomserverAPI.SendEventWithState( ctx, r.rsAPI, roomserverAPI.KindNew, respState, event.Headered(respMakeJoin.RoomVersion), nil, ); err != nil { logrus.WithFields(logrus.Fields{ "room_id": roomID, "user_id": userID, }).WithError(err).Error("Failed to send room join response to roomserver") return } }() <-ctx.Done() return nil } // PerformLeaveRequest implements api.FederationSenderInternalAPI func (r *FederationSenderInternalAPI) PerformLeave( ctx context.Context, request *api.PerformLeaveRequest, response *api.PerformLeaveResponse, ) (err error) { // Deduplicate the server names we were provided. util.SortAndUnique(request.ServerNames) // Try each server that we were provided until we land on one that // successfully completes the make-leave send-leave dance. for _, serverName := range request.ServerNames { // Try to perform a make_leave using the information supplied in the // request. respMakeLeave, err := r.federation.MakeLeave( ctx, serverName, request.RoomID, request.UserID, ) if err != nil { // TODO: Check if the user was not allowed to leave the room. logrus.WithError(err).Warnf("r.federation.MakeLeave failed") r.statistics.ForServer(serverName).Failure() continue } // Set all the fields to be what they should be, this should be a no-op // but it's possible that the remote server returned us something "odd" respMakeLeave.LeaveEvent.Type = gomatrixserverlib.MRoomMember respMakeLeave.LeaveEvent.Sender = request.UserID respMakeLeave.LeaveEvent.StateKey = &request.UserID respMakeLeave.LeaveEvent.RoomID = request.RoomID respMakeLeave.LeaveEvent.Redacts = "" if respMakeLeave.LeaveEvent.Content == nil { content := map[string]interface{}{ "membership": "leave", } if err = respMakeLeave.LeaveEvent.SetContent(content); err != nil { logrus.WithError(err).Warnf("respMakeLeave.LeaveEvent.SetContent failed") continue } } if err = respMakeLeave.LeaveEvent.SetUnsigned(struct{}{}); err != nil { logrus.WithError(err).Warnf("respMakeLeave.LeaveEvent.SetUnsigned failed") continue } // Work out if we support the room version that has been supplied in // the make_leave response. if _, err = respMakeLeave.RoomVersion.EventFormat(); err != nil { return gomatrixserverlib.UnsupportedRoomVersionError{} } // Build the leave event. event, err := respMakeLeave.LeaveEvent.Build( time.Now(), r.cfg.Matrix.ServerName, r.cfg.Matrix.KeyID, r.cfg.Matrix.PrivateKey, respMakeLeave.RoomVersion, ) if err != nil { logrus.WithError(err).Warnf("respMakeLeave.LeaveEvent.Build failed") continue } // Try to perform a send_leave using the newly built event. err = r.federation.SendLeave( ctx, serverName, event, ) if err != nil { logrus.WithError(err).Warnf("r.federation.SendLeave failed") r.statistics.ForServer(serverName).Failure() continue } r.statistics.ForServer(serverName).Success() return nil } // If we reach here then we didn't complete a leave for some reason. return fmt.Errorf( "Failed to leave room %q through %d server(s)", request.RoomID, len(request.ServerNames), ) } // PerformLeaveRequest implements api.FederationSenderInternalAPI func (r *FederationSenderInternalAPI) PerformInvite( ctx context.Context, request *api.PerformInviteRequest, response *api.PerformInviteResponse, ) (err error) { if request.Event.StateKey() == nil { return errors.New("invite must be a state event") } _, destination, err := gomatrixserverlib.SplitID('@', *request.Event.StateKey()) if err != nil { return fmt.Errorf("gomatrixserverlib.SplitID: %w", err) } logrus.WithFields(logrus.Fields{ "event_id": request.Event.EventID(), "user_id": *request.Event.StateKey(), "room_id": request.Event.RoomID(), "room_version": request.RoomVersion, "destination": destination, }).Info("Sending invite") inviteReq, err := gomatrixserverlib.NewInviteV2Request(&request.Event, request.InviteRoomState) if err != nil { return fmt.Errorf("gomatrixserverlib.NewInviteV2Request: %w", err) } inviteRes, err := r.federation.SendInviteV2(ctx, destination, inviteReq) if err != nil { return fmt.Errorf("r.federation.SendInviteV2: %w", err) } response.Event = inviteRes.Event.Headered(request.RoomVersion) return nil } // PerformServersAlive implements api.FederationSenderInternalAPI func (r *FederationSenderInternalAPI) PerformServersAlive( ctx context.Context, request *api.PerformServersAliveRequest, response *api.PerformServersAliveResponse, ) (err error) { for _, srv := range request.Servers { r.queues.RetryServer(srv) } return nil } // PerformServersAlive implements api.FederationSenderInternalAPI func (r *FederationSenderInternalAPI) PerformBroadcastEDU( ctx context.Context, request *api.PerformBroadcastEDURequest, response *api.PerformBroadcastEDUResponse, ) (err error) { destinations, err := r.db.GetAllJoinedHosts(ctx) if err != nil { return fmt.Errorf("r.db.GetAllJoinedHosts: %w", err) } if len(destinations) == 0 { return nil } logrus.WithContext(ctx).Infof("Sending wake-up EDU to %d destination(s)", len(destinations)) edu := &gomatrixserverlib.EDU{ Type: "org.matrix.dendrite.wakeup", Origin: string(r.cfg.Matrix.ServerName), } if err = r.queues.SendEDU(edu, r.cfg.Matrix.ServerName, destinations); err != nil { return fmt.Errorf("r.queues.SendEDU: %w", err) } wakeReq := &api.PerformServersAliveRequest{ Servers: destinations, } wakeRes := &api.PerformServersAliveResponse{} if err := r.PerformServersAlive(ctx, wakeReq, wakeRes); err != nil { return fmt.Errorf("r.PerformServersAlive: %w", err) } return nil } func sanityCheckSendJoinResponse(respSendJoin gomatrixserverlib.RespSendJoin) error { // sanity check we have a create event and it has a known room version for _, ev := range respSendJoin.AuthEvents { if ev.Type() == gomatrixserverlib.MRoomCreate && ev.StateKeyEquals("") { // make sure the room version is known content := ev.Content() verBody := struct { Version string `json:"room_version"` }{} err := json.Unmarshal(content, &verBody) if err != nil { return err } if verBody.Version == "" { // https://matrix.org/docs/spec/client_server/r0.6.0#m-room-create // The version of the room. Defaults to "1" if the key does not exist. verBody.Version = "1" } knownVersions := gomatrixserverlib.RoomVersions() if _, ok := knownVersions[gomatrixserverlib.RoomVersion(verBody.Version)]; !ok { return fmt.Errorf("send_join m.room.create event has an unknown room version: %s", verBody.Version) } return nil } } return fmt.Errorf("send_join response is missing m.room.create event") } func setDefaultRoomVersionFromJoinEvent(joinEvent gomatrixserverlib.EventBuilder) gomatrixserverlib.RoomVersion { // if auth events are not event references we know it must be v3+ // we have to do these shenanigans to satisfy sytest, specifically for: // "Outbound federation rejects m.room.create events with an unknown room version" hasEventRefs := true authEvents, ok := joinEvent.AuthEvents.([]interface{}) if ok { if len(authEvents) > 0 { _, ok = authEvents[0].(string) if ok { // event refs are objects, not strings, so we know we must be dealing with a v3+ room. hasEventRefs = false } } } if hasEventRefs { return gomatrixserverlib.RoomVersionV1 } return gomatrixserverlib.RoomVersionV4 }