Guest user registration

Signed-off-by: Thibaut CHARLES cromfr@gmail.com

appservice/appservice.go

@@ -118,7 +118,7 @@ func generateAppServiceAccount(
 	ctx := context.Background()
 
 	// Create an account for the application service
-	acc, err := accountsDB.CreateAccount(ctx, as.SenderLocalpart, "", as.ID)
+	acc, err := accountsDB.CreateAccount(ctx, false, as.SenderLocalpart, "", as.ID)
 	if err != nil {
 		return err
 	} else if acc == nil {

clientapi/auth/storage/accounts/accounts_table.go

@@ -36,16 +36,18 @@ CREATE TABLE IF NOT EXISTS account_accounts (
     -- The password hash for this account. Can be NULL if this is a passwordless account.
     password_hash TEXT,
     -- Identifies which application service this account belongs to, if any.
-    appservice_id TEXT
+    appservice_id TEXT,
+    -- Whether it is a guest account with limited access or not
+    is_guest BOOL
     -- TODO:
-    -- is_guest, is_admin, upgraded_ts, devices, any email reset stuff?
+    -- is_admin, upgraded_ts, devices, any email reset stuff?
 );
 -- Create sequence for autogenerated numeric usernames
 CREATE SEQUENCE IF NOT EXISTS numeric_username_seq START 1;
 `
 
 const insertAccountSQL = "" +
-	"INSERT INTO account_accounts(localpart, created_ts, password_hash, appservice_id) VALUES ($1, $2, $3, $4)"
+	"INSERT INTO account_accounts(localpart, created_ts, password_hash, appservice_id, is_guest) VALUES ($1, $2, $3, $4, $5)"
 
 const selectAccountByLocalpartSQL = "" +
 	"SELECT localpart, appservice_id FROM account_accounts WHERE localpart = $1"
@@ -91,16 +93,16 @@ func (s *accountsStatements) prepare(db *sql.DB, server gomatrixserverlib.Server
 // this account will be passwordless. Returns an error if this account already exists. Returns the account
 // on success.
 func (s *accountsStatements) insertAccount(
-	ctx context.Context, localpart, hash, appserviceID string,
+	ctx context.Context, isGuest bool, localpart, hash, appserviceID string,
 ) (*authtypes.Account, error) {
 	createdTimeMS := time.Now().UnixNano() / 1000000
 	stmt := s.insertAccountStmt
 
 	var err error
 	if appserviceID == "" {
-		_, err = stmt.ExecContext(ctx, localpart, createdTimeMS, hash, nil)
+		_, err = stmt.ExecContext(ctx, localpart, createdTimeMS, hash, nil, isGuest)
 	} else {
-		_, err = stmt.ExecContext(ctx, localpart, createdTimeMS, hash, appserviceID)
+		_, err = stmt.ExecContext(ctx, localpart, createdTimeMS, hash, appserviceID, isGuest)
 	}
 	if err != nil {
 		return nil, err

clientapi/auth/storage/accounts/storage.go

@@ -122,7 +122,7 @@ func (d *Database) SetDisplayName(
 // for this account. If no password is supplied, the account will be a passwordless account. If the
 // account already exists, it will return nil, nil.
 func (d *Database) CreateAccount(
-	ctx context.Context, localpart, plaintextPassword, appserviceID string,
+	ctx context.Context, isGuest bool, localpart, plaintextPassword, appserviceID string,
 ) (*authtypes.Account, error) {
 	var err error
 
@@ -140,7 +140,7 @@ func (d *Database) CreateAccount(
 		}
 		return nil, err
 	}
-	return d.accounts.insertAccount(ctx, localpart, hash, appserviceID)
+	return d.accounts.insertAccount(ctx, isGuest, localpart, hash, appserviceID)
 }
 
 // SaveMembership saves the user matching a given localpart as a member of a given

clientapi/routing/register.go

@@ -56,6 +56,12 @@ var (
 			Help: "Total number of registered users",
 		},
 	)
+	amtGuestUsers = prometheus.NewCounter(
+		prometheus.CounterOpts{
+			Name: "dendrite_clientapi_guest_users_total",
+			Help: "Total number of guest users",
+		},
+	)
 )
 
 const (
@@ -68,6 +74,7 @@ const (
 func init() {
 	// Register prometheus metrics. They must be registered to be exposed.
 	prometheus.MustRegister(amtRegUsers)
+	prometheus.MustRegister(amtGuestUsers)
 }
 
 // sessionsDict keeps track of completed auth stages for each session.
@@ -443,18 +450,24 @@ func Register(
 	deviceDB *devices.Database,
 	cfg *config.Dendrite,
 ) util.JSONResponse {
-
 	var r registerRequest
 	resErr := httputil.UnmarshalJSONRequest(req, &r)
 	if resErr != nil {
 		return *resErr
 	}
 
-	// Retrieve or generate the sessionID
-	sessionID := r.Auth.Session
-	if sessionID == "" {
-		// Generate a new, random session ID
-		sessionID = util.RandomString(sessionIDLength)
+	var isGuest bool
+	switch req.URL.Query().Get("kind") {
+	case "user", "":
+		isGuest = false
+	case "guest":
+		isGuest = true
+		// Guest registration ignores all JSON body except initial_device_display_name
+		r = registerRequest{
+			InitialDisplayName: r.InitialDisplayName,
+		}
+	default:
+		return util.MessageResponse(http.StatusBadRequest, "kind must be either 'user' or 'guest'")
 	}
 
 	// Don't allow numeric usernames less than MAX_INT64.
@@ -497,12 +510,27 @@ func Register(
 
 	logger := util.GetLogger(req.Context())
 	logger.WithFields(log.Fields{
+		"guest":      isGuest,
 		"username":   r.Username,
 		"auth.type":  r.Auth.Type,
 		"session_id": r.Auth.Session,
 	}).Info("Processing registration request")
 
-	return handleRegistrationFlow(req, r, sessionID, cfg, accountDB, deviceDB)
+	if isGuest {
+		// Immediately register a guest account
+		return handleGuestRegistration(req, r, cfg, accountDB, deviceDB)
+	} else {
+		// Start registration flow
+
+		// Retrieve or generate the sessionID
+		sessionID := r.Auth.Session
+		if sessionID == "" {
+			// Generate a new, random session ID
+			sessionID = util.RandomString(sessionIDLength)
+		}
+
+		return handleRegistrationFlow(req, r, sessionID, cfg, accountDB, deviceDB)
+	}
 }
 
 // handleRegistrationFlow will direct and complete registration flow stages
@@ -597,6 +625,27 @@ func handleRegistrationFlow(
 		req, r, sessionID, cfg, accountDB, deviceDB)
 }
 
+// Registers immediately a guest account, if guest registration is enabled on the server
+func handleGuestRegistration(
+	req *http.Request,
+	r registerRequest,
+	cfg *config.Dendrite,
+	accountDB *accounts.Database,
+	deviceDB *devices.Database,
+) util.JSONResponse {
+
+	// Exit if guest registration is forbidden
+	if cfg.Matrix.GuestAccessDisabled {
+		return util.MessageResponse(http.StatusForbidden, "Guest access has been disabled")
+	}
+
+	// Create guest user
+	return completeRegistration(
+		req.Context(), accountDB, deviceDB, true, r.Username, r.Password, "",
+		r.InhibitLogin, r.InitialDisplayName, r.DeviceID,
+	)
+}
+
 // handleApplicationServiceRegistration handles the registration of an
 // application service's user by validating the AS from its access token and
 // registering the user. Its two first parameters must be the two return values
@@ -636,7 +685,7 @@ func handleApplicationServiceRegistration(
 	// Don't need to worry about appending to registration stages as
 	// application service registration is entirely separate.
 	return completeRegistration(
-		req.Context(), accountDB, deviceDB, r.Username, "", appserviceID,
+		req.Context(), accountDB, deviceDB, false, r.Username, "", appserviceID,
 		r.InhibitLogin, r.InitialDisplayName, r.DeviceID,
 	)
 }
@@ -656,7 +705,7 @@ func checkAndCompleteFlow(
 	if checkFlowCompleted(flow, cfg.Derived.Registration.Flows) {
 		// This flow was completed, registration can continue
 		return completeRegistration(
-			req.Context(), accountDB, deviceDB, r.Username, r.Password, "",
+			req.Context(), accountDB, deviceDB, false, r.Username, r.Password, "",
 			r.InhibitLogin, r.InitialDisplayName, r.DeviceID,
 		)
 	}
@@ -708,10 +757,10 @@ func LegacyRegister(
 			return util.MessageResponse(http.StatusForbidden, "HMAC incorrect")
 		}
 
-		return completeRegistration(req.Context(), accountDB, deviceDB, r.Username, r.Password, "", false, nil, nil)
+		return completeRegistration(req.Context(), accountDB, deviceDB, false, r.Username, r.Password, "", false, nil, nil)
 	case authtypes.LoginTypeDummy:
 		// there is nothing to do
-		return completeRegistration(req.Context(), accountDB, deviceDB, r.Username, r.Password, "", false, nil, nil)
+		return completeRegistration(req.Context(), accountDB, deviceDB, false, r.Username, r.Password, "", false, nil, nil)
 	default:
 		return util.JSONResponse{
 			Code: http.StatusNotImplemented,
@@ -759,6 +808,7 @@ func completeRegistration(
 	ctx context.Context,
 	accountDB *accounts.Database,
 	deviceDB *devices.Database,
+	isGuest bool,
 	username, password, appserviceID string,
 	inhibitLogin common.WeakBoolean,
 	displayName, deviceID *string,
@@ -777,7 +827,7 @@ func completeRegistration(
 		}
 	}
 
-	acc, err := accountDB.CreateAccount(ctx, username, password, appserviceID)
+	acc, err := accountDB.CreateAccount(ctx, isGuest, username, password, appserviceID)
 	if err != nil {
 		return util.JSONResponse{
 			Code: http.StatusInternalServerError,
@@ -791,7 +841,11 @@ func completeRegistration(
 	}
 
 	// Increment prometheus counter for created users
-	amtRegUsers.Inc()
+	if isGuest {
+		amtRegUsers.Inc()
+	} else {
+		amtGuestUsers.Inc()
+	}
 
 	// Check whether inhibit_login option is set. If so, don't create an access
 	// token or a device for this user

cmd/create-account/main.go

@@ -69,7 +69,7 @@ func main() {
 		os.Exit(1)
 	}
 
-	account, err := accountDB.CreateAccount(context.Background(), *username, *password, "")
+	account, err := accountDB.CreateAccount(context.Background(), false, *username, *password, "")
 	if err != nil {
 		fmt.Println(err.Error())
 		os.Exit(1)

common/config/config.go

@@ -99,6 +99,9 @@ type Dendrite struct {
 		// If set disables new users from registering (except via shared
 		// secrets)
 		RegistrationDisabled bool `yaml:"registration_disabled"`
+		// If set disables new users from registering (except via shared
+		// secrets)
+		GuestAccessDisabled bool `yaml:"guest_access_disabled"`
 	} `yaml:"matrix"`
 
 	// The configuration specific to the media repostitory.

dendrite-config.yaml

@@ -18,6 +18,9 @@ matrix:
       - vector.im
       - matrix.org
 
+    # Setting this to false will allow guest user to register on the server
+    guest_access_disabled: true
+
 # The media repository config
 media:
     # The base path to where the media files will be stored. May be relative or absolute.

testfile

@@ -182,3 +182,20 @@ Regular users cannot create room aliases within the AS namespace
 Deleting a non-existent alias should return a 404
 Users can't delete other's aliases
 Outbound federation can query room alias directory
+Guest user cannot call /events globally
+Guest users can join guest_access rooms
+Guest user can set display names
+Guest user cannot upgrade other users
+Guest non-joined user cannot call /events on shared room
+Guest non-joined user cannot call /events on invited room
+Guest non-joined user cannot call /events on joined room
+Guest non-joined user cannot call /events on default room
+Guest non-joined users can get state for world_readable rooms
+Guest non-joined users can get individual state for world_readable rooms
+Guest non-joined users cannot room initalSync for non-world_readable rooms
+Guest non-joined users can get individual state for world_readable rooms after leaving
+Guest non-joined users cannot send messages to guest_access rooms if not joined
+Guest users can sync from world_readable guest_access rooms if joined
+Guest users can sync from default guest_access rooms if joined
+Real non-joined users cannot room initalSync for non-world_readable rooms
+Newly joined room is included in an incremental sync after invite