Put privilege drop to previous location

cmd/cc-backend/main.go

@@ -212,13 +212,6 @@ func main() {
 		serverStart()
 	}()
 
-	// Because this program will want to bind to a privileged port (like 80), the listener must
-	// be established first, then the user can be changed, and after that,
-	// the actual http server can be started.
-	if err := runtimeEnv.DropPrivileges(config.Keys.Group, config.Keys.User); err != nil {
-		log.Fatalf("error while preparing server start: %s", err.Error())
-	}
-
 	wg.Add(1)
 	sigs := make(chan os.Signal, 1)
 	signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)

cmd/cc-backend/server.go

@@ -27,6 +27,7 @@ import (
 	"github.com/ClusterCockpit/cc-backend/internal/graph/generated"
 	"github.com/ClusterCockpit/cc-backend/internal/routerConfig"
 	"github.com/ClusterCockpit/cc-backend/pkg/log"
+	"github.com/ClusterCockpit/cc-backend/pkg/runtimeEnv"
 	"github.com/ClusterCockpit/cc-backend/web"
 	"github.com/gorilla/handlers"
 	"github.com/gorilla/mux"
@@ -298,6 +299,13 @@ func serverStart() {
 	} else {
 		fmt.Printf("HTTP server listening at %s...", config.Keys.Addr)
 	}
+	//
+	// Because this program will want to bind to a privileged port (like 80), the listener must
+	// be established first, then the user can be changed, and after that,
+	// the actual http server can be started.
+	if err := runtimeEnv.DropPrivileges(config.Keys.Group, config.Keys.User); err != nil {
+		log.Fatalf("error while preparing server start: %s", err.Error())
+	}
 
 	if err = server.Serve(listener); err != nil && err != http.ErrServerClosed {
 		log.Fatalf("starting server failed: %v", err)