grant CodeBase "file:./Login.jar" {
        permission java.security.AllPermission;
};

grant CodeBase "file:./SampleServer.jar" 
	Principal javax.security.auth.kerberos.KerberosPrincipal 
		"service_principal@your_realm" {

	permission java.net.SocketPermission "*", "accept";

	permission javax.security.auth.kerberos.ServicePermission
		"service_principal@your_realm", "accept";
};