mirror of
https://github.com/matrix-org/dendrite
synced 2024-12-15 15:52:48 +00:00
487 lines
16 KiB
Go
487 lines
16 KiB
Go
// Copyright 2017 New Vector Ltd
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package routing
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import (
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"encoding/json"
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"fmt"
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"net/http"
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"sort"
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"time"
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"github.com/matrix-org/dendrite/clientapi/jsonerror"
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"github.com/matrix-org/dendrite/internal/eventutil"
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"github.com/matrix-org/dendrite/roomserver/api"
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"github.com/matrix-org/dendrite/setup/config"
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"github.com/matrix-org/gomatrixserverlib"
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"github.com/matrix-org/util"
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"github.com/sirupsen/logrus"
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)
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// MakeJoin implements the /make_join API
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func MakeJoin(
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httpReq *http.Request,
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request *gomatrixserverlib.FederationRequest,
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cfg *config.FederationAPI,
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rsAPI api.FederationRoomserverAPI,
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roomID, userID string,
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remoteVersions []gomatrixserverlib.RoomVersion,
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) util.JSONResponse {
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verReq := api.QueryRoomVersionForRoomRequest{RoomID: roomID}
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verRes := api.QueryRoomVersionForRoomResponse{}
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if err := rsAPI.QueryRoomVersionForRoom(httpReq.Context(), &verReq, &verRes); err != nil {
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return util.JSONResponse{
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Code: http.StatusInternalServerError,
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JSON: jsonerror.InternalServerError(),
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}
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}
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// Check that the room that the remote side is trying to join is actually
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// one of the room versions that they listed in their supported ?ver= in
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// the make_join URL.
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// https://matrix.org/docs/spec/server_server/r0.1.3#get-matrix-federation-v1-make-join-roomid-userid
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remoteSupportsVersion := false
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for _, v := range remoteVersions {
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if v == verRes.RoomVersion {
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remoteSupportsVersion = true
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break
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}
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}
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// If it isn't, stop trying to join the room.
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if !remoteSupportsVersion {
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return util.JSONResponse{
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Code: http.StatusBadRequest,
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JSON: jsonerror.IncompatibleRoomVersion(verRes.RoomVersion),
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}
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}
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_, domain, err := gomatrixserverlib.SplitID('@', userID)
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if err != nil {
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return util.JSONResponse{
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Code: http.StatusBadRequest,
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JSON: jsonerror.BadJSON("Invalid UserID"),
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}
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}
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if domain != request.Origin() {
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return util.JSONResponse{
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Code: http.StatusForbidden,
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JSON: jsonerror.Forbidden("The join must be sent by the server of the user"),
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}
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}
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// Check if we think we are still joined to the room
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inRoomReq := &api.QueryServerJoinedToRoomRequest{
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ServerName: cfg.Matrix.ServerName,
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RoomID: roomID,
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}
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inRoomRes := &api.QueryServerJoinedToRoomResponse{}
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if err = rsAPI.QueryServerJoinedToRoom(httpReq.Context(), inRoomReq, inRoomRes); err != nil {
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util.GetLogger(httpReq.Context()).WithError(err).Error("rsAPI.QueryServerJoinedToRoom failed")
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return jsonerror.InternalServerError()
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}
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if !inRoomRes.RoomExists {
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return util.JSONResponse{
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Code: http.StatusNotFound,
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JSON: jsonerror.NotFound(fmt.Sprintf("Room ID %q was not found on this server", roomID)),
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}
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}
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if !inRoomRes.IsInRoom {
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return util.JSONResponse{
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Code: http.StatusNotFound,
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JSON: jsonerror.NotFound(fmt.Sprintf("Room ID %q has no remaining users on this server", roomID)),
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}
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}
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// Check if the restricted join is allowed. If the room doesn't
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// support restricted joins then this is effectively a no-op.
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res, authorisedVia, err := checkRestrictedJoin(httpReq, rsAPI, verRes.RoomVersion, roomID, userID)
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if err != nil {
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util.GetLogger(httpReq.Context()).WithError(err).Error("checkRestrictedJoin failed")
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return jsonerror.InternalServerError()
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} else if res != nil {
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return *res
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}
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// Try building an event for the server
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builder := gomatrixserverlib.EventBuilder{
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Sender: userID,
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RoomID: roomID,
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Type: "m.room.member",
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StateKey: &userID,
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}
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content := gomatrixserverlib.MemberContent{
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Membership: gomatrixserverlib.Join,
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AuthorisedVia: authorisedVia,
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}
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if err = builder.SetContent(content); err != nil {
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util.GetLogger(httpReq.Context()).WithError(err).Error("builder.SetContent failed")
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return jsonerror.InternalServerError()
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}
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queryRes := api.QueryLatestEventsAndStateResponse{
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RoomVersion: verRes.RoomVersion,
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}
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event, err := eventutil.QueryAndBuildEvent(httpReq.Context(), &builder, cfg.Matrix, time.Now(), rsAPI, &queryRes)
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if err == eventutil.ErrRoomNoExists {
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return util.JSONResponse{
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Code: http.StatusNotFound,
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JSON: jsonerror.NotFound("Room does not exist"),
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}
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} else if e, ok := err.(gomatrixserverlib.BadJSONError); ok {
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return util.JSONResponse{
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Code: http.StatusBadRequest,
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JSON: jsonerror.BadJSON(e.Error()),
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}
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} else if err != nil {
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util.GetLogger(httpReq.Context()).WithError(err).Error("eventutil.BuildEvent failed")
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return jsonerror.InternalServerError()
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}
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// Check that the join is allowed or not
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stateEvents := make([]*gomatrixserverlib.Event, len(queryRes.StateEvents))
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for i := range queryRes.StateEvents {
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stateEvents[i] = queryRes.StateEvents[i].Event
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}
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provider := gomatrixserverlib.NewAuthEvents(stateEvents)
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if err = gomatrixserverlib.Allowed(event.Event, &provider); err != nil {
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return util.JSONResponse{
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Code: http.StatusForbidden,
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JSON: jsonerror.Forbidden(err.Error()),
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}
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}
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return util.JSONResponse{
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Code: http.StatusOK,
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JSON: map[string]interface{}{
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"event": builder,
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"room_version": verRes.RoomVersion,
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},
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}
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}
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// SendJoin implements the /send_join API
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// The make-join send-join dance makes much more sense as a single
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// flow so the cyclomatic complexity is high:
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// nolint:gocyclo
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func SendJoin(
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httpReq *http.Request,
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request *gomatrixserverlib.FederationRequest,
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cfg *config.FederationAPI,
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rsAPI api.FederationRoomserverAPI,
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keys gomatrixserverlib.JSONVerifier,
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roomID, eventID string,
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) util.JSONResponse {
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verReq := api.QueryRoomVersionForRoomRequest{RoomID: roomID}
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verRes := api.QueryRoomVersionForRoomResponse{}
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if err := rsAPI.QueryRoomVersionForRoom(httpReq.Context(), &verReq, &verRes); err != nil {
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util.GetLogger(httpReq.Context()).WithError(err).Error("rsAPI.QueryRoomVersionForRoom failed")
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return util.JSONResponse{
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Code: http.StatusInternalServerError,
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JSON: jsonerror.InternalServerError(),
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}
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}
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event, err := gomatrixserverlib.NewEventFromUntrustedJSON(request.Content(), verRes.RoomVersion)
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if err != nil {
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return util.JSONResponse{
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Code: http.StatusBadRequest,
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JSON: jsonerror.BadJSON("The request body could not be decoded into valid JSON: " + err.Error()),
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}
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}
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// Check that a state key is provided.
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if event.StateKey() == nil || event.StateKeyEquals("") {
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return util.JSONResponse{
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Code: http.StatusBadRequest,
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JSON: jsonerror.BadJSON("No state key was provided in the join event."),
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}
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}
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if !event.StateKeyEquals(event.Sender()) {
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return util.JSONResponse{
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Code: http.StatusBadRequest,
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JSON: jsonerror.BadJSON("Event state key must match the event sender."),
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}
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}
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// Check that the room ID is correct.
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if event.RoomID() != roomID {
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return util.JSONResponse{
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Code: http.StatusBadRequest,
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JSON: jsonerror.BadJSON(
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fmt.Sprintf(
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"The room ID in the request path (%q) must match the room ID in the join event JSON (%q)",
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roomID, event.RoomID(),
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),
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),
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}
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}
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// Check that the event ID is correct.
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if event.EventID() != eventID {
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return util.JSONResponse{
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Code: http.StatusBadRequest,
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JSON: jsonerror.BadJSON(
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fmt.Sprintf(
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"The event ID in the request path (%q) must match the event ID in the join event JSON (%q)",
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eventID, event.EventID(),
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),
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),
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}
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}
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// Check that the event is from the server sending the request.
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if event.Origin() != request.Origin() {
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return util.JSONResponse{
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Code: http.StatusForbidden,
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JSON: jsonerror.Forbidden("The join must be sent by the server it originated on"),
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}
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}
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// Check that this is in fact a join event
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membership, err := event.Membership()
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if err != nil {
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return util.JSONResponse{
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Code: http.StatusBadRequest,
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JSON: jsonerror.BadJSON("missing content.membership key"),
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}
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}
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if membership != gomatrixserverlib.Join {
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return util.JSONResponse{
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Code: http.StatusBadRequest,
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JSON: jsonerror.BadJSON("membership must be 'join'"),
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}
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}
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// Check that the event is signed by the server sending the request.
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redacted := event.Redact()
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verifyRequests := []gomatrixserverlib.VerifyJSONRequest{{
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ServerName: event.Origin(),
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Message: redacted.JSON(),
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AtTS: event.OriginServerTS(),
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StrictValidityChecking: true,
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}}
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verifyResults, err := keys.VerifyJSONs(httpReq.Context(), verifyRequests)
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if err != nil {
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util.GetLogger(httpReq.Context()).WithError(err).Error("keys.VerifyJSONs failed")
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return jsonerror.InternalServerError()
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}
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if verifyResults[0].Error != nil {
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return util.JSONResponse{
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Code: http.StatusForbidden,
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JSON: jsonerror.Forbidden("Signature check failed: " + verifyResults[0].Error.Error()),
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}
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}
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// Fetch the state and auth chain. We do this before we send the events
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// on, in case this fails.
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var stateAndAuthChainResponse api.QueryStateAndAuthChainResponse
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err = rsAPI.QueryStateAndAuthChain(httpReq.Context(), &api.QueryStateAndAuthChainRequest{
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PrevEventIDs: event.PrevEventIDs(),
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AuthEventIDs: event.AuthEventIDs(),
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RoomID: roomID,
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ResolveState: true,
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}, &stateAndAuthChainResponse)
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if err != nil {
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util.GetLogger(httpReq.Context()).WithError(err).Error("rsAPI.QueryStateAndAuthChain failed")
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return jsonerror.InternalServerError()
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}
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if !stateAndAuthChainResponse.RoomExists {
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return util.JSONResponse{
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Code: http.StatusNotFound,
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JSON: jsonerror.NotFound("Room does not exist"),
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}
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}
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// Check if the user is already in the room. If they're already in then
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// there isn't much point in sending another join event into the room.
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// Also check to see if they are banned: if they are then we reject them.
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alreadyJoined := false
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isBanned := false
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for _, se := range stateAndAuthChainResponse.StateEvents {
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if !se.StateKeyEquals(*event.StateKey()) {
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continue
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}
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if membership, merr := se.Membership(); merr == nil {
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alreadyJoined = (membership == gomatrixserverlib.Join)
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isBanned = (membership == gomatrixserverlib.Ban)
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break
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}
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}
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if isBanned {
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return util.JSONResponse{
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Code: http.StatusForbidden,
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JSON: jsonerror.Forbidden("user is banned"),
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}
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}
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// If the membership content contains a user ID for a server that is not
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// ours then we should kick it back.
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var memberContent gomatrixserverlib.MemberContent
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if err := json.Unmarshal(event.Content(), &memberContent); err != nil {
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return util.JSONResponse{
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Code: http.StatusBadRequest,
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JSON: jsonerror.BadJSON(err.Error()),
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}
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}
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if memberContent.AuthorisedVia != "" {
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_, domain, err := gomatrixserverlib.SplitID('@', memberContent.AuthorisedVia)
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if err != nil {
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return util.JSONResponse{
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Code: http.StatusBadRequest,
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JSON: jsonerror.BadJSON(fmt.Sprintf("The authorising username %q is invalid.", memberContent.AuthorisedVia)),
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}
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}
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if domain != cfg.Matrix.ServerName {
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return util.JSONResponse{
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Code: http.StatusBadRequest,
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JSON: jsonerror.BadJSON(fmt.Sprintf("The authorising username %q does not belong to this server.", memberContent.AuthorisedVia)),
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}
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}
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}
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// Sign the membership event. This is required for restricted joins to work
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// in the case that the authorised via user is one of our own users. It also
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// doesn't hurt to do it even if it isn't a restricted join.
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signed := event.Sign(
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string(cfg.Matrix.ServerName),
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cfg.Matrix.KeyID,
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cfg.Matrix.PrivateKey,
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)
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// Send the events to the room server.
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// We are responsible for notifying other servers that the user has joined
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// the room, so set SendAsServer to cfg.Matrix.ServerName
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if !alreadyJoined {
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var response api.InputRoomEventsResponse
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rsAPI.InputRoomEvents(httpReq.Context(), &api.InputRoomEventsRequest{
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InputRoomEvents: []api.InputRoomEvent{
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{
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Kind: api.KindNew,
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Event: signed.Headered(stateAndAuthChainResponse.RoomVersion),
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SendAsServer: string(cfg.Matrix.ServerName),
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TransactionID: nil,
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},
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},
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}, &response)
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if response.ErrMsg != "" {
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util.GetLogger(httpReq.Context()).WithField(logrus.ErrorKey, response.ErrMsg).Error("SendEvents failed")
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if response.NotAllowed {
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return util.JSONResponse{
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Code: http.StatusBadRequest,
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JSON: jsonerror.Forbidden(response.ErrMsg),
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}
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}
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return jsonerror.InternalServerError()
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}
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}
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// sort events deterministically by depth (lower is earlier)
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// We also do this because sytest's basic federation server isn't good at using the correct
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// state if these lists are randomised, resulting in flakey tests. :(
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sort.Sort(eventsByDepth(stateAndAuthChainResponse.StateEvents))
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sort.Sort(eventsByDepth(stateAndAuthChainResponse.AuthChainEvents))
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// https://matrix.org/docs/spec/server_server/latest#put-matrix-federation-v1-send-join-roomid-eventid
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return util.JSONResponse{
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Code: http.StatusOK,
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JSON: gomatrixserverlib.RespSendJoin{
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StateEvents: gomatrixserverlib.NewEventJSONsFromHeaderedEvents(stateAndAuthChainResponse.StateEvents),
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AuthEvents: gomatrixserverlib.NewEventJSONsFromHeaderedEvents(stateAndAuthChainResponse.AuthChainEvents),
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Origin: cfg.Matrix.ServerName,
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Event: signed.JSON(),
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},
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}
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}
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// checkRestrictedJoin finds out whether or not we can assist in processing
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// a restricted room join. If the room version does not support restricted
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// joins then this function returns with no side effects. This returns three
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// values:
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// * an optional JSON response body (i.e. M_UNABLE_TO_AUTHORISE_JOIN) which
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// should always be sent back to the client if one is specified
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// * a user ID of an authorising user, typically a user that has power to
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// issue invites in the room, if one has been found
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// * an error if there was a problem finding out if this was allowable,
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// like if the room version isn't known or a problem happened talking to
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// the roomserver
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func checkRestrictedJoin(
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httpReq *http.Request,
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rsAPI api.FederationRoomserverAPI,
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roomVersion gomatrixserverlib.RoomVersion,
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roomID, userID string,
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) (*util.JSONResponse, string, error) {
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if allowRestricted, err := roomVersion.AllowRestrictedJoinsInEventAuth(); err != nil {
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return nil, "", err
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} else if !allowRestricted {
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return nil, "", nil
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}
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req := &api.QueryRestrictedJoinAllowedRequest{
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RoomID: roomID,
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UserID: userID,
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}
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res := &api.QueryRestrictedJoinAllowedResponse{}
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if err := rsAPI.QueryRestrictedJoinAllowed(httpReq.Context(), req, res); err != nil {
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return nil, "", err
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}
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switch {
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case !res.Restricted:
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// The join rules for the room don't restrict membership.
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return nil, "", nil
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case !res.Resident:
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// The join rules restrict membership but our server isn't currently
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// joined to all of the allowed rooms, so we can't actually decide
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// whether or not to allow the user to join. This error code should
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// tell the joining server to try joining via another resident server
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// instead.
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return &util.JSONResponse{
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Code: http.StatusBadRequest,
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JSON: jsonerror.UnableToAuthoriseJoin("This server cannot authorise the join."),
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}, "", nil
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case !res.Allowed:
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// The join rules restrict membership, our server is in the relevant
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// rooms and the user wasn't joined to join any of the allowed rooms
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// and therefore can't join this room.
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return &util.JSONResponse{
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Code: http.StatusForbidden,
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JSON: jsonerror.Forbidden("You are not joined to any matching rooms."),
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}, "", nil
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default:
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// The join rules restrict membership, our server is in the relevant
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// rooms and the user was allowed to join because they belong to one
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// of the allowed rooms. We now need to pick one of our own local users
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// from within the room to use as the authorising user ID, so that it
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// can be referred to from within the membership content.
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return nil, res.AuthorisedVia, nil
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}
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}
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type eventsByDepth []*gomatrixserverlib.HeaderedEvent
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func (e eventsByDepth) Len() int {
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return len(e)
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}
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func (e eventsByDepth) Swap(i, j int) {
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e[i], e[j] = e[j], e[i]
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}
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func (e eventsByDepth) Less(i, j int) bool {
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return e[i].Depth() < e[j].Depth()
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}
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