mirror of
https://github.com/matrix-org/dendrite
synced 2024-12-21 10:33:28 +00:00
393 lines
14 KiB
Go
393 lines
14 KiB
Go
// Copyright 2020 The Matrix.org Foundation C.I.C.
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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 perform
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import (
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"context"
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"database/sql"
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"errors"
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"fmt"
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"strings"
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"time"
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"github.com/getsentry/sentry-go"
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"github.com/matrix-org/gomatrixserverlib"
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"github.com/matrix-org/gomatrixserverlib/spec"
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"github.com/sirupsen/logrus"
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"github.com/tidwall/gjson"
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fsAPI "github.com/matrix-org/dendrite/federationapi/api"
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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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rsAPI "github.com/matrix-org/dendrite/roomserver/api"
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"github.com/matrix-org/dendrite/roomserver/internal/helpers"
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"github.com/matrix-org/dendrite/roomserver/internal/input"
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"github.com/matrix-org/dendrite/roomserver/internal/query"
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"github.com/matrix-org/dendrite/roomserver/storage"
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"github.com/matrix-org/dendrite/roomserver/types"
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"github.com/matrix-org/dendrite/setup/config"
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)
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type Joiner struct {
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Cfg *config.RoomServer
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FSAPI fsAPI.RoomserverFederationAPI
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RSAPI rsAPI.RoomserverInternalAPI
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DB storage.Database
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Inputer *input.Inputer
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Queryer *query.Queryer
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}
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// PerformJoin handles joining matrix rooms, including over federation by talking to the federationapi.
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func (r *Joiner) PerformJoin(
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ctx context.Context,
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req *rsAPI.PerformJoinRequest,
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) (roomID string, joinedVia spec.ServerName, err error) {
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logger := logrus.WithContext(ctx).WithFields(logrus.Fields{
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"room_id": req.RoomIDOrAlias,
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"user_id": req.UserID,
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"servers": req.ServerNames,
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})
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logger.Info("User requested to room join")
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roomID, joinedVia, err = r.performJoin(context.Background(), req)
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if err != nil {
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logger.WithError(err).Error("Failed to join room")
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sentry.CaptureException(err)
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return "", "", err
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}
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logger.Info("User joined room successfully")
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return roomID, joinedVia, nil
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}
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func (r *Joiner) performJoin(
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ctx context.Context,
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req *rsAPI.PerformJoinRequest,
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) (string, spec.ServerName, error) {
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_, domain, err := gomatrixserverlib.SplitID('@', req.UserID)
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if err != nil {
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return "", "", rsAPI.ErrInvalidID{Err: fmt.Errorf("supplied user ID %q in incorrect format", req.UserID)}
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}
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if !r.Cfg.Matrix.IsLocalServerName(domain) {
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return "", "", rsAPI.ErrInvalidID{Err: fmt.Errorf("user %q does not belong to this homeserver", req.UserID)}
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}
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if strings.HasPrefix(req.RoomIDOrAlias, "!") {
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return r.performJoinRoomByID(ctx, req)
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}
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if strings.HasPrefix(req.RoomIDOrAlias, "#") {
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return r.performJoinRoomByAlias(ctx, req)
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}
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return "", "", rsAPI.ErrInvalidID{Err: fmt.Errorf("room ID or alias %q is invalid", req.RoomIDOrAlias)}
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}
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func (r *Joiner) performJoinRoomByAlias(
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ctx context.Context,
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req *rsAPI.PerformJoinRequest,
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) (string, spec.ServerName, error) {
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// Get the domain part of the room alias.
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_, domain, err := gomatrixserverlib.SplitID('#', req.RoomIDOrAlias)
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if err != nil {
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return "", "", fmt.Errorf("alias %q is not in the correct format", req.RoomIDOrAlias)
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}
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req.ServerNames = append(req.ServerNames, domain)
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// Check if this alias matches our own server configuration. If it
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// doesn't then we'll need to try a federated join.
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var roomID string
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if !r.Cfg.Matrix.IsLocalServerName(domain) {
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// The alias isn't owned by us, so we will need to try joining using
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// a remote server.
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dirReq := fsAPI.PerformDirectoryLookupRequest{
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RoomAlias: req.RoomIDOrAlias, // the room alias to lookup
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ServerName: domain, // the server to ask
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}
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dirRes := fsAPI.PerformDirectoryLookupResponse{}
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err = r.FSAPI.PerformDirectoryLookup(ctx, &dirReq, &dirRes)
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if err != nil {
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logrus.WithError(err).Errorf("error looking up alias %q", req.RoomIDOrAlias)
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return "", "", fmt.Errorf("looking up alias %q over federation failed: %w", req.RoomIDOrAlias, err)
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}
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roomID = dirRes.RoomID
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req.ServerNames = append(req.ServerNames, dirRes.ServerNames...)
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} else {
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var getRoomReq = rsAPI.GetRoomIDForAliasRequest{
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Alias: req.RoomIDOrAlias,
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IncludeAppservices: true,
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}
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var getRoomRes = rsAPI.GetRoomIDForAliasResponse{}
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// Otherwise, look up if we know this room alias locally.
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err = r.RSAPI.GetRoomIDForAlias(ctx, &getRoomReq, &getRoomRes)
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if err != nil {
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return "", "", fmt.Errorf("lookup room alias %q failed: %w", req.RoomIDOrAlias, err)
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}
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roomID = getRoomRes.RoomID
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}
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// If the room ID is empty then we failed to look up the alias.
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if roomID == "" {
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return "", "", fmt.Errorf("alias %q not found", req.RoomIDOrAlias)
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}
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// If we do, then pluck out the room ID and continue the join.
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req.RoomIDOrAlias = roomID
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return r.performJoinRoomByID(ctx, req)
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}
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// TODO: Break this function up a bit & move to GMSL
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// nolint:gocyclo
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func (r *Joiner) performJoinRoomByID(
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ctx context.Context,
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req *rsAPI.PerformJoinRequest,
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) (string, spec.ServerName, error) {
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// The original client request ?server_name=... may include this HS so filter that out so we
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// don't attempt to make_join with ourselves
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for i := 0; i < len(req.ServerNames); i++ {
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if r.Cfg.Matrix.IsLocalServerName(req.ServerNames[i]) {
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// delete this entry
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req.ServerNames = append(req.ServerNames[:i], req.ServerNames[i+1:]...)
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i--
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}
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}
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// Get the domain part of the room ID.
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_, domain, err := gomatrixserverlib.SplitID('!', req.RoomIDOrAlias)
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if err != nil {
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return "", "", rsAPI.ErrInvalidID{Err: fmt.Errorf("room ID %q is invalid: %w", req.RoomIDOrAlias, err)}
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}
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// If the server name in the room ID isn't ours then it's a
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// possible candidate for finding the room via federation. Add
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// it to the list of servers to try.
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if !r.Cfg.Matrix.IsLocalServerName(domain) {
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req.ServerNames = append(req.ServerNames, domain)
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}
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// Prepare the template for the join event.
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userID := req.UserID
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_, userDomain, err := r.Cfg.Matrix.SplitLocalID('@', userID)
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if err != nil {
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return "", "", rsAPI.ErrInvalidID{Err: fmt.Errorf("user ID %q is invalid: %w", userID, err)}
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}
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proto := gomatrixserverlib.ProtoEvent{
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Type: spec.MRoomMember,
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Sender: userID,
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StateKey: &userID,
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RoomID: req.RoomIDOrAlias,
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Redacts: "",
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}
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if err = proto.SetUnsigned(struct{}{}); err != nil {
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return "", "", fmt.Errorf("eb.SetUnsigned: %w", err)
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}
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// It is possible for the request to include some "content" for the
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// event. We'll always overwrite the "membership" key, but the rest,
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// like "display_name" or "avatar_url", will be kept if supplied.
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if req.Content == nil {
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req.Content = map[string]interface{}{}
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}
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req.Content["membership"] = spec.Join
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if authorisedVia, aerr := r.populateAuthorisedViaUserForRestrictedJoin(ctx, req); aerr != nil {
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return "", "", aerr
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} else if authorisedVia != "" {
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req.Content["join_authorised_via_users_server"] = authorisedVia
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}
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if err = proto.SetContent(req.Content); err != nil {
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return "", "", fmt.Errorf("eb.SetContent: %w", err)
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}
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// Force a federated join if we aren't in the room and we've been
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// given some server names to try joining by.
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inRoomReq := &rsAPI.QueryServerJoinedToRoomRequest{
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RoomID: req.RoomIDOrAlias,
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}
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inRoomRes := &rsAPI.QueryServerJoinedToRoomResponse{}
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if err = r.Queryer.QueryServerJoinedToRoom(ctx, inRoomReq, inRoomRes); err != nil {
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return "", "", fmt.Errorf("r.Queryer.QueryServerJoinedToRoom: %w", err)
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}
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serverInRoom := inRoomRes.IsInRoom
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forceFederatedJoin := len(req.ServerNames) > 0 && !serverInRoom
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// Force a federated join if we're dealing with a pending invite
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// and we aren't in the room.
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isInvitePending, inviteSender, _, inviteEvent, err := helpers.IsInvitePending(ctx, r.DB, req.RoomIDOrAlias, req.UserID)
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if err == nil && !serverInRoom && isInvitePending {
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_, inviterDomain, ierr := gomatrixserverlib.SplitID('@', inviteSender)
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if ierr != nil {
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return "", "", fmt.Errorf("gomatrixserverlib.SplitID: %w", err)
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}
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// If we were invited by someone from another server then we can
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// assume they are in the room so we can join via them.
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if !r.Cfg.Matrix.IsLocalServerName(inviterDomain) {
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req.ServerNames = append(req.ServerNames, inviterDomain)
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forceFederatedJoin = true
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memberEvent := gjson.Parse(string(inviteEvent.JSON()))
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// only set unsigned if we've got a content.membership, which we _should_
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if memberEvent.Get("content.membership").Exists() {
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req.Unsigned = map[string]interface{}{
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"prev_sender": memberEvent.Get("sender").Str,
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"prev_content": map[string]interface{}{
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"is_direct": memberEvent.Get("content.is_direct").Bool(),
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"membership": memberEvent.Get("content.membership").Str,
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},
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}
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}
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}
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}
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// If a guest is trying to join a room, check that the room has a m.room.guest_access event
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if req.IsGuest {
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var guestAccessEvent *types.HeaderedEvent
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guestAccess := "forbidden"
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guestAccessEvent, err = r.DB.GetStateEvent(ctx, req.RoomIDOrAlias, spec.MRoomGuestAccess, "")
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if (err != nil && !errors.Is(err, sql.ErrNoRows)) || guestAccessEvent == nil {
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logrus.WithError(err).Warn("unable to get m.room.guest_access event, defaulting to 'forbidden'")
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}
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if guestAccessEvent != nil {
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guestAccess = gjson.GetBytes(guestAccessEvent.Content(), "guest_access").String()
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}
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// Servers MUST only allow guest users to join rooms if the m.room.guest_access state event
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// is present on the room and has the guest_access value can_join.
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if guestAccess != "can_join" {
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return "", "", rsAPI.ErrNotAllowed{Err: fmt.Errorf("guest access is forbidden")}
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}
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}
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// If we should do a forced federated join then do that.
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var joinedVia spec.ServerName
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if forceFederatedJoin {
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joinedVia, err = r.performFederatedJoinRoomByID(ctx, req)
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return req.RoomIDOrAlias, joinedVia, err
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}
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// Try to construct an actual join event from the template.
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// If this succeeds then it is a sign that the room already exists
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// locally on the homeserver.
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// TODO: Check what happens if the room exists on the server
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// but everyone has since left. I suspect it does the wrong thing.
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var buildRes rsAPI.QueryLatestEventsAndStateResponse
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identity, err := r.Cfg.Matrix.SigningIdentityFor(userDomain)
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if err != nil {
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return "", "", fmt.Errorf("error joining local room: %q", err)
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}
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event, err := eventutil.QueryAndBuildEvent(ctx, &proto, r.Cfg.Matrix, identity, time.Now(), r.RSAPI, &buildRes)
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switch err.(type) {
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case nil:
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// The room join is local. Send the new join event into the
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// roomserver. First of all check that the user isn't already
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// a member of the room. This is best-effort (as in we won't
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// fail if we can't find the existing membership) because there
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// is really no harm in just sending another membership event.
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membershipReq := &api.QueryMembershipForUserRequest{
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RoomID: req.RoomIDOrAlias,
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UserID: userID,
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}
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membershipRes := &api.QueryMembershipForUserResponse{}
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_ = r.Queryer.QueryMembershipForUser(ctx, membershipReq, membershipRes)
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// If we haven't already joined the room then send an event
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// into the room changing our membership status.
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if !membershipRes.RoomExists || !membershipRes.IsInRoom {
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inputReq := rsAPI.InputRoomEventsRequest{
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InputRoomEvents: []rsAPI.InputRoomEvent{
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{
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Kind: rsAPI.KindNew,
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Event: event,
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SendAsServer: string(userDomain),
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},
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},
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}
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inputRes := rsAPI.InputRoomEventsResponse{}
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r.Inputer.InputRoomEvents(ctx, &inputReq, &inputRes)
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if err = inputRes.Err(); err != nil {
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return "", "", rsAPI.ErrNotAllowed{Err: err}
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}
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}
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case eventutil.ErrRoomNoExists:
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// The room doesn't exist locally. If the room ID looks like it should
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// be ours then this probably means that we've nuked our database at
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// some point.
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if r.Cfg.Matrix.IsLocalServerName(domain) {
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// If there are no more server names to try then give up here.
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// Otherwise we'll try a federated join as normal, since it's quite
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// possible that the room still exists on other servers.
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if len(req.ServerNames) == 0 {
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return "", "", eventutil.ErrRoomNoExists{}
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}
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}
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// Perform a federated room join.
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joinedVia, err = r.performFederatedJoinRoomByID(ctx, req)
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return req.RoomIDOrAlias, joinedVia, err
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default:
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// Something else went wrong.
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return "", "", fmt.Errorf("error joining local room: %q", err)
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}
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// By this point, if req.RoomIDOrAlias contained an alias, then
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// it will have been overwritten with a room ID by performJoinRoomByAlias.
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// We should now include this in the response so that the CS API can
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// return the right room ID.
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return req.RoomIDOrAlias, userDomain, nil
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}
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func (r *Joiner) performFederatedJoinRoomByID(
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ctx context.Context,
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req *rsAPI.PerformJoinRequest,
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) (spec.ServerName, error) {
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// Try joining by all of the supplied server names.
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fedReq := fsAPI.PerformJoinRequest{
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RoomID: req.RoomIDOrAlias, // the room ID to try and join
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UserID: req.UserID, // the user ID joining the room
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ServerNames: req.ServerNames, // the server to try joining with
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Content: req.Content, // the membership event content
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Unsigned: req.Unsigned, // the unsigned event content, if any
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}
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fedRes := fsAPI.PerformJoinResponse{}
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r.FSAPI.PerformJoin(ctx, &fedReq, &fedRes)
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if fedRes.LastError != nil {
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return "", fedRes.LastError
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}
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return fedRes.JoinedVia, nil
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}
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func (r *Joiner) populateAuthorisedViaUserForRestrictedJoin(
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ctx context.Context,
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joinReq *rsAPI.PerformJoinRequest,
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) (string, error) {
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req := &api.QueryRestrictedJoinAllowedRequest{
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UserID: joinReq.UserID,
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RoomID: joinReq.RoomIDOrAlias,
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}
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res := &api.QueryRestrictedJoinAllowedResponse{}
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if err := r.Queryer.QueryRestrictedJoinAllowed(ctx, req, res); err != nil {
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return "", fmt.Errorf("r.Queryer.QueryRestrictedJoinAllowed: %w", err)
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}
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if !res.Restricted {
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return "", nil
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}
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if !res.Resident {
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return "", nil
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}
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if !res.Allowed {
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return "", rsAPI.ErrNotAllowed{Err: fmt.Errorf("the join to room %s was not allowed", joinReq.RoomIDOrAlias)}
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}
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return res.AuthorisedVia, nil
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}
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