grant codebase "file:./*" {
  permission javax.security.auth.AuthPermission 
      "createLoginContext";
  permission javax.security.auth.AuthPermission 
      "modifyPrincipals";
  permission javax.security.auth.AuthPermission 
      "doAsPrivileged";
};

grant Principal NamePrincipal "np" {
  permission java.io.FilePermission "test.txt", "read";
};