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/* Drop all authentication credentials.
Copyright (C) 2013 Free Software Foundation, Inc.
Written by Justus Winter <4winter@informatik.uni-hamburg.de>
This file is part of the GNU Hurd.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2, or (at
your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include <hurd.h>
/* Obtain an empty authentication handle and use it for further
authentication purposes. This effectively drops all Unix
privileges. */
error_t
setnullauth (void)
{
error_t err;
auth_t ourauth = getauth ();
auth_t nullauth;
err = auth_makeauth (ourauth,
NULL, MACH_MSG_TYPE_COPY_SEND, 0,
NULL, 0,
NULL, 0,
NULL, 0,
NULL, 0,
&nullauth);
mach_port_deallocate (mach_task_self (), ourauth);
if (err)
return err;
err = setauth (nullauth);
return err;
}
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