mirror of
https://github.com/hoernschen/dendrite.git
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567 lines
19 KiB
Go
567 lines
19 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.RoomserverInternalAPI,
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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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// 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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err = builder.SetContent(map[string]interface{}{"membership": gomatrixserverlib.Join})
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if 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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// Check the join rules. If it's a restricted join then there are special rules.
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// We have to do this in two steps in order to satisfy the Complement tests. The
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// first is to get the join rule itself, and the second is to unmarshal the 'allow'
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// key. The tests deliberately set the 'allow' key to some nonsense values, but if
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// we try to unmarshal that all in one go, the entire unmarshalling step fails,
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// incorrectly leaving the room as the default join rule of 'public'.
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joinRuleEvent, err := provider.JoinRules()
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if err != nil {
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return util.JSONResponse{
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Code: http.StatusNotFound,
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JSON: jsonerror.NotFound("Failed to retrieve join rules"),
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}
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}
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joinRule := struct {
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JoinRule string `json:"join_rule"`
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}{
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JoinRule: gomatrixserverlib.Public, // Default join rule if not specified.
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}
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if joinRuleEvent != nil {
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if err = json.Unmarshal(joinRuleEvent.Content(), &joinRule); err != nil {
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return util.JSONResponse{
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Code: http.StatusBadRequest,
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JSON: jsonerror.Unknown("Failed to unmarshal room join rule"),
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}
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}
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}
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var joinRuleAllow struct {
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Allow []gomatrixserverlib.JoinRuleContentAllowRule `json:"allow"`
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}
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_ = json.Unmarshal(joinRuleEvent.Content(), &joinRuleAllow)
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if err = gomatrixserverlib.Allowed(event.Event, &provider); err != nil {
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if joinRule.JoinRule == gomatrixserverlib.Restricted {
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res := attemptMakeJoinForRestrictedMembership(
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httpReq, cfg, rsAPI, &verRes, provider, &builder,
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gomatrixserverlib.JoinRuleContent{
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JoinRule: joinRule.JoinRule,
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Allow: joinRuleAllow.Allow,
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},
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userID,
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)
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return res
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}
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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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func attemptMakeJoinForRestrictedMembership(
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httpReq *http.Request,
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cfg *config.FederationAPI,
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rsAPI api.RoomserverInternalAPI,
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verRes *api.QueryRoomVersionForRoomResponse,
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provider gomatrixserverlib.AuthEvents,
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builder *gomatrixserverlib.EventBuilder,
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joinRules gomatrixserverlib.JoinRuleContent,
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userID string,
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) util.JSONResponse {
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logger := util.GetLogger(httpReq.Context()).WithField("restricted_join", userID)
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foundUserInAnyRoom := false
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ableToAuthoriseJoin := false
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// As a last effort, see if any of the restricted join rules match.
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// If so, we might be able to modify and sign the event so that it
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// does pass auth.
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var powerLevels gomatrixserverlib.PowerLevelContent
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if powerLevelsEvent, err := provider.PowerLevels(); err != nil {
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logger.WithError(err).Error("Failed to get power levels from auth events")
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return util.JSONResponse{
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Code: http.StatusForbidden, // TODO: StatusBadRequest
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JSON: jsonerror.UnableToAuthoriseJoin("Room power levels do not exist"),
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}
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} else if err := json.Unmarshal(powerLevelsEvent.Content(), &powerLevels); err != nil {
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logger.WithError(err).Error("Failed to unmarshal power levels")
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return util.JSONResponse{
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Code: http.StatusForbidden, // TODO: StatusBadRequest
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JSON: jsonerror.UnableToAuthoriseJoin("Failed to unmarshal room power levels"),
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}
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}
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// Let's see if we can validate the user being in
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// any of the allowed rooms.
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for _, allowed := range joinRules.Allow {
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// Skip types that we don't know about.
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if allowed.Type != gomatrixserverlib.MRoomMembership {
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continue
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}
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if _, _, err := gomatrixserverlib.SplitID('!', allowed.RoomID); err != nil {
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continue
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}
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// Ask the room server if we know about the specified room ID.
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queryReq := &api.QueryMembershipsForRoomRequest{
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RoomID: allowed.RoomID,
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JoinedOnly: true,
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}
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queryRes := &api.QueryMembershipsForRoomResponse{}
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if err := rsAPI.QueryMembershipsForRoom(httpReq.Context(), queryReq, queryRes); err != nil {
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logger.WithError(err).Errorf("Failed to query membership for room %q", queryReq.RoomID)
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continue
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}
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// Now have a look and see if any of the joined users match the
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// user who has initiated this join.
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found := false
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for _, member := range queryRes.JoinEvents {
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if *member.StateKey == userID {
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found = true
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break
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}
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}
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// The user doesn't seem to exist in this room, try the next one.
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if !found {
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continue
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}
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// Now look through all of the join events of the other members. Our goal
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// is to try and find a user from our own server that has a suitable power
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// level to popuate into the `join_authorised_via_users_server` field.
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foundUserInAnyRoom = true
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for _, member := range queryRes.JoinEvents {
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// If the user doesn't come from our own server then it's no good, try
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// the next one instead.
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_, domain, err := gomatrixserverlib.SplitID('@', *member.StateKey)
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if err != nil {
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continue
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}
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if domain != cfg.Matrix.ServerName {
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continue
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}
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// We have a user who is joined to the room, so we can authorise joins.
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// We will only be able to "grant" joins if any of our users have the
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// power to invite other users — this flag helps us to return the right
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// error code if not.
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ableToAuthoriseJoin = true
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// If the user has the ability to invite to the room then they are a
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// suitable candidate for the `join_authorised_via_users_server`.
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if powerLevels.UserLevel(*member.StateKey) >= powerLevels.Invite {
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// We'll set the event content again, this time including the
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// `join_authorised_via_users_server` field for the chosen user.
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err := builder.SetContent(map[string]interface{}{
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"membership": gomatrixserverlib.Join,
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"join_authorised_via_users_server": *member.StateKey,
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})
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if err != nil {
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logger.WithError(err).Error("builder.SetContent failed")
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return jsonerror.InternalServerError()
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}
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// Then we'll build the event again. This is a second hit on the
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// roomserver sadly, but it's a necessary evil.
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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 != nil {
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logger.WithError(err).Error("builder.SetContent failed")
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return jsonerror.InternalServerError()
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}
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// Sign and return the event. This is basically our seal of approval
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// that other servers can use to verify that the user we put into the
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// `join_authorised_via_users_server` field was actually checked
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// and found by us.
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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": event.Sign(
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string(cfg.Matrix.ServerName), cfg.Matrix.KeyID, cfg.Matrix.PrivateKey,
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),
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"room_version": verRes.RoomVersion,
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},
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}
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}
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}
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}
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switch {
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case ableToAuthoriseJoin && foundUserInAnyRoom:
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// We found ourselves in some of the allowed rooms, but none of our
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// users had a suitable power level to invite other users, so we
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// don't have the ability to grant joins.
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return util.JSONResponse{
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Code: http.StatusForbidden, // TODO: StatusBadRequest
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JSON: jsonerror.UnableToGrantJoin("None of the users from this homeserver have the power to invite"),
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}
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case ableToAuthoriseJoin && !foundUserInAnyRoom:
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// We found ourselves in some of the allowed rooms, but none of them
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// seemed to contain the joining user.
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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 allowed rooms"),
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}
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default:
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// We don't seem to be joined to any of the allowed rooms, so we
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// can't even check if the join is supposed to be allowed or not.
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return util.JSONResponse{
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Code: http.StatusForbidden, // TODO: StatusBadRequest
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JSON: jsonerror.UnableToAuthoriseJoin("This homeserver isn't joined to any of the allowed rooms"),
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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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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.RoomserverInternalAPI,
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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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// 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.
|
|
alreadyJoined := false
|
|
isBanned := false
|
|
for _, se := range stateAndAuthChainResponse.StateEvents {
|
|
if !se.StateKeyEquals(*event.StateKey()) {
|
|
continue
|
|
}
|
|
if membership, merr := se.Membership(); merr == nil {
|
|
alreadyJoined = (membership == gomatrixserverlib.Join)
|
|
isBanned = (membership == gomatrixserverlib.Ban)
|
|
break
|
|
}
|
|
}
|
|
|
|
if isBanned {
|
|
return util.JSONResponse{
|
|
Code: http.StatusForbidden,
|
|
JSON: jsonerror.Forbidden("user is banned"),
|
|
}
|
|
}
|
|
|
|
// Send the events to the room server.
|
|
// We are responsible for notifying other servers that the user has joined
|
|
// the room, so set SendAsServer to cfg.Matrix.ServerName
|
|
if !alreadyJoined {
|
|
var response api.InputRoomEventsResponse
|
|
rsAPI.InputRoomEvents(httpReq.Context(), &api.InputRoomEventsRequest{
|
|
InputRoomEvents: []api.InputRoomEvent{
|
|
{
|
|
Kind: api.KindNew,
|
|
Event: event.Headered(stateAndAuthChainResponse.RoomVersion),
|
|
AuthEventIDs: event.AuthEventIDs(),
|
|
SendAsServer: string(cfg.Matrix.ServerName),
|
|
TransactionID: nil,
|
|
},
|
|
},
|
|
}, &response)
|
|
if response.ErrMsg != "" {
|
|
util.GetLogger(httpReq.Context()).WithField(logrus.ErrorKey, response.ErrMsg).Error("SendEvents failed")
|
|
if response.NotAllowed {
|
|
return util.JSONResponse{
|
|
Code: http.StatusForbidden,
|
|
JSON: jsonerror.Forbidden(response.ErrMsg),
|
|
}
|
|
}
|
|
return jsonerror.InternalServerError()
|
|
}
|
|
}
|
|
|
|
// sort events deterministically by depth (lower is earlier)
|
|
// We also do this because sytest's basic federation server isn't good at using the correct
|
|
// state if these lists are randomised, resulting in flakey tests. :(
|
|
sort.Sort(eventsByDepth(stateAndAuthChainResponse.StateEvents))
|
|
sort.Sort(eventsByDepth(stateAndAuthChainResponse.AuthChainEvents))
|
|
|
|
// https://matrix.org/docs/spec/server_server/latest#put-matrix-federation-v1-send-join-roomid-eventid
|
|
return util.JSONResponse{
|
|
Code: http.StatusOK,
|
|
JSON: gomatrixserverlib.RespSendJoin{
|
|
StateEvents: gomatrixserverlib.UnwrapEventHeaders(stateAndAuthChainResponse.StateEvents),
|
|
AuthEvents: gomatrixserverlib.UnwrapEventHeaders(stateAndAuthChainResponse.AuthChainEvents),
|
|
Origin: cfg.Matrix.ServerName,
|
|
},
|
|
}
|
|
}
|
|
|
|
type eventsByDepth []*gomatrixserverlib.HeaderedEvent
|
|
|
|
func (e eventsByDepth) Len() int {
|
|
return len(e)
|
|
}
|
|
func (e eventsByDepth) Swap(i, j int) {
|
|
e[i], e[j] = e[j], e[i]
|
|
}
|
|
func (e eventsByDepth) Less(i, j int) bool {
|
|
return e[i].Depth() < e[j].Depth()
|
|
}
|