dendrite/federationapi/routing/join.go
kegsay 7df3e691f2
Fix failing complement test (#1917)
Specifically `TestBannedUserCannotSendJoin`
2021-07-13 12:22:27 +01:00

341 lines
11 KiB
Go

// Copyright 2017 New Vector Ltd
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package routing
import (
"fmt"
"net/http"
"sort"
"time"
"github.com/matrix-org/dendrite/clientapi/jsonerror"
"github.com/matrix-org/dendrite/internal/eventutil"
"github.com/matrix-org/dendrite/roomserver/api"
"github.com/matrix-org/dendrite/setup/config"
"github.com/matrix-org/gomatrixserverlib"
"github.com/matrix-org/util"
)
// MakeJoin implements the /make_join API
func MakeJoin(
httpReq *http.Request,
request *gomatrixserverlib.FederationRequest,
cfg *config.FederationAPI,
rsAPI api.RoomserverInternalAPI,
roomID, userID string,
remoteVersions []gomatrixserverlib.RoomVersion,
) util.JSONResponse {
verReq := api.QueryRoomVersionForRoomRequest{RoomID: roomID}
verRes := api.QueryRoomVersionForRoomResponse{}
if err := rsAPI.QueryRoomVersionForRoom(httpReq.Context(), &verReq, &verRes); err != nil {
return util.JSONResponse{
Code: http.StatusInternalServerError,
JSON: jsonerror.InternalServerError(),
}
}
// Check that the room that the remote side is trying to join is actually
// one of the room versions that they listed in their supported ?ver= in
// the make_join URL.
// https://matrix.org/docs/spec/server_server/r0.1.3#get-matrix-federation-v1-make-join-roomid-userid
remoteSupportsVersion := false
for _, v := range remoteVersions {
if v == verRes.RoomVersion {
remoteSupportsVersion = true
break
}
}
// If it isn't, stop trying to join the room.
if !remoteSupportsVersion {
return util.JSONResponse{
Code: http.StatusBadRequest,
JSON: jsonerror.IncompatibleRoomVersion(verRes.RoomVersion),
}
}
_, domain, err := gomatrixserverlib.SplitID('@', userID)
if err != nil {
return util.JSONResponse{
Code: http.StatusBadRequest,
JSON: jsonerror.BadJSON("Invalid UserID"),
}
}
if domain != request.Origin() {
return util.JSONResponse{
Code: http.StatusForbidden,
JSON: jsonerror.Forbidden("The join must be sent by the server of the user"),
}
}
// Check if we think we are still joined to the room
inRoomReq := &api.QueryServerJoinedToRoomRequest{
ServerName: cfg.Matrix.ServerName,
RoomID: roomID,
}
inRoomRes := &api.QueryServerJoinedToRoomResponse{}
if err = rsAPI.QueryServerJoinedToRoom(httpReq.Context(), inRoomReq, inRoomRes); err != nil {
util.GetLogger(httpReq.Context()).WithError(err).Error("rsAPI.QueryServerJoinedToRoom failed")
return jsonerror.InternalServerError()
}
if !inRoomRes.RoomExists {
return util.JSONResponse{
Code: http.StatusNotFound,
JSON: jsonerror.NotFound(fmt.Sprintf("Room ID %q was not found on this server", roomID)),
}
}
if !inRoomRes.IsInRoom {
return util.JSONResponse{
Code: http.StatusNotFound,
JSON: jsonerror.NotFound(fmt.Sprintf("Room ID %q has no remaining users on this server", roomID)),
}
}
// Try building an event for the server
builder := gomatrixserverlib.EventBuilder{
Sender: userID,
RoomID: roomID,
Type: "m.room.member",
StateKey: &userID,
}
err = builder.SetContent(map[string]interface{}{"membership": gomatrixserverlib.Join})
if err != nil {
util.GetLogger(httpReq.Context()).WithError(err).Error("builder.SetContent failed")
return jsonerror.InternalServerError()
}
queryRes := api.QueryLatestEventsAndStateResponse{
RoomVersion: verRes.RoomVersion,
}
event, err := eventutil.QueryAndBuildEvent(httpReq.Context(), &builder, cfg.Matrix, time.Now(), rsAPI, &queryRes)
if err == eventutil.ErrRoomNoExists {
return util.JSONResponse{
Code: http.StatusNotFound,
JSON: jsonerror.NotFound("Room does not exist"),
}
} else if e, ok := err.(gomatrixserverlib.BadJSONError); ok {
return util.JSONResponse{
Code: http.StatusBadRequest,
JSON: jsonerror.BadJSON(e.Error()),
}
} else if err != nil {
util.GetLogger(httpReq.Context()).WithError(err).Error("eventutil.BuildEvent failed")
return jsonerror.InternalServerError()
}
// Check that the join is allowed or not
stateEvents := make([]*gomatrixserverlib.Event, len(queryRes.StateEvents))
for i := range queryRes.StateEvents {
stateEvents[i] = queryRes.StateEvents[i].Event
}
provider := gomatrixserverlib.NewAuthEvents(stateEvents)
if err = gomatrixserverlib.Allowed(event.Event, &provider); err != nil {
return util.JSONResponse{
Code: http.StatusForbidden,
JSON: jsonerror.Forbidden(err.Error()),
}
}
return util.JSONResponse{
Code: http.StatusOK,
JSON: map[string]interface{}{
"event": builder,
"room_version": verRes.RoomVersion,
},
}
}
// SendJoin implements the /send_join API
// The make-join send-join dance makes much more sense as a single
// flow so the cyclomatic complexity is high:
func SendJoin(
httpReq *http.Request,
request *gomatrixserverlib.FederationRequest,
cfg *config.FederationAPI,
rsAPI api.RoomserverInternalAPI,
keys gomatrixserverlib.JSONVerifier,
roomID, eventID string,
) util.JSONResponse {
verReq := api.QueryRoomVersionForRoomRequest{RoomID: roomID}
verRes := api.QueryRoomVersionForRoomResponse{}
if err := rsAPI.QueryRoomVersionForRoom(httpReq.Context(), &verReq, &verRes); err != nil {
util.GetLogger(httpReq.Context()).WithError(err).Error("rsAPI.QueryRoomVersionForRoom failed")
return util.JSONResponse{
Code: http.StatusInternalServerError,
JSON: jsonerror.InternalServerError(),
}
}
event, err := gomatrixserverlib.NewEventFromUntrustedJSON(request.Content(), verRes.RoomVersion)
if err != nil {
return util.JSONResponse{
Code: http.StatusBadRequest,
JSON: jsonerror.BadJSON("The request body could not be decoded into valid JSON: " + err.Error()),
}
}
// Check that a state key is provided.
if event.StateKey() == nil || event.StateKeyEquals("") {
return util.JSONResponse{
Code: http.StatusBadRequest,
JSON: jsonerror.BadJSON("No state key was provided in the join event."),
}
}
// Check that the room ID is correct.
if event.RoomID() != roomID {
return util.JSONResponse{
Code: http.StatusBadRequest,
JSON: jsonerror.BadJSON(
fmt.Sprintf(
"The room ID in the request path (%q) must match the room ID in the join event JSON (%q)",
roomID, event.RoomID(),
),
),
}
}
// Check that the event ID is correct.
if event.EventID() != eventID {
return util.JSONResponse{
Code: http.StatusBadRequest,
JSON: jsonerror.BadJSON(
fmt.Sprintf(
"The event ID in the request path (%q) must match the event ID in the join event JSON (%q)",
eventID, event.EventID(),
),
),
}
}
// Check that the event is from the server sending the request.
if event.Origin() != request.Origin() {
return util.JSONResponse{
Code: http.StatusForbidden,
JSON: jsonerror.Forbidden("The join must be sent by the server it originated on"),
}
}
// Check that the event is signed by the server sending the request.
redacted := event.Redact()
verifyRequests := []gomatrixserverlib.VerifyJSONRequest{{
ServerName: event.Origin(),
Message: redacted.JSON(),
AtTS: event.OriginServerTS(),
StrictValidityChecking: true,
}}
verifyResults, err := keys.VerifyJSONs(httpReq.Context(), verifyRequests)
if err != nil {
util.GetLogger(httpReq.Context()).WithError(err).Error("keys.VerifyJSONs failed")
return jsonerror.InternalServerError()
}
if verifyResults[0].Error != nil {
return util.JSONResponse{
Code: http.StatusForbidden,
JSON: jsonerror.Forbidden("Signature check failed: " + verifyResults[0].Error.Error()),
}
}
// Fetch the state and auth chain. We do this before we send the events
// on, in case this fails.
var stateAndAuthChainResponse api.QueryStateAndAuthChainResponse
err = rsAPI.QueryStateAndAuthChain(httpReq.Context(), &api.QueryStateAndAuthChainRequest{
PrevEventIDs: event.PrevEventIDs(),
AuthEventIDs: event.AuthEventIDs(),
RoomID: roomID,
ResolveState: true,
}, &stateAndAuthChainResponse)
if err != nil {
util.GetLogger(httpReq.Context()).WithError(err).Error("rsAPI.QueryStateAndAuthChain failed")
return jsonerror.InternalServerError()
}
if !stateAndAuthChainResponse.RoomExists {
return util.JSONResponse{
Code: http.StatusNotFound,
JSON: jsonerror.NotFound("Room does not exist"),
}
}
// Check if the user is already in the room. If they're already in then
// there isn't much point in sending another join event into the room.
// 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 {
if err = api.SendEvents(
httpReq.Context(), rsAPI,
api.KindNew,
[]*gomatrixserverlib.HeaderedEvent{
event.Headered(stateAndAuthChainResponse.RoomVersion),
},
cfg.Matrix.ServerName,
nil,
); err != nil {
util.GetLogger(httpReq.Context()).WithError(err).Error("SendEvents failed")
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()
}