mirror of git://sourceware.org/git/glibc.git
124 lines
3.1 KiB
C
124 lines
3.1 KiB
C
/* setresgid -- set real group ID, effective group ID, and saved-set group ID
|
|
Copyright (C) 2002-2018 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library 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
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <errno.h>
|
|
#include <unistd.h>
|
|
#include <hurd.h>
|
|
#include <hurd/id.h>
|
|
|
|
/* Set the real group ID, effective group ID, and saved-set group ID,
|
|
of the calling process to RGID, EGID, and SGID, respectively. */
|
|
int
|
|
__setresgid (gid_t rgid, gid_t egid, gid_t sgid)
|
|
{
|
|
auth_t newauth;
|
|
error_t err;
|
|
|
|
HURD_CRITICAL_BEGIN;
|
|
__mutex_lock (&_hurd_id.lock);
|
|
err = _hurd_check_ids ();
|
|
|
|
if (!err)
|
|
{
|
|
/* Make a new auth handle which has EGID as the first element in the
|
|
list of effective gids. */
|
|
|
|
uid_t *newgen, *newaux;
|
|
uid_t auxs[2] = { rgid, sgid };
|
|
size_t ngen, naux;
|
|
|
|
newgen = _hurd_id.gen.gids;
|
|
ngen = _hurd_id.gen.ngids;
|
|
if (egid != -1)
|
|
{
|
|
if (_hurd_id.gen.ngids == 0)
|
|
{
|
|
/* No effective gids now. The new set will be just UID. */
|
|
newgen = &egid;
|
|
ngen = 1;
|
|
}
|
|
else
|
|
{
|
|
_hurd_id.gen.gids[0] = egid;
|
|
_hurd_id.valid = 0;
|
|
}
|
|
}
|
|
|
|
newaux = _hurd_id.aux.gids;
|
|
naux = _hurd_id.aux.ngids;
|
|
if (rgid != -1)
|
|
{
|
|
if (_hurd_id.aux.ngids == 0)
|
|
{
|
|
newaux = &rgid;
|
|
naux = 1;
|
|
}
|
|
else
|
|
{
|
|
_hurd_id.aux.gids[0] = rgid;
|
|
_hurd_id.valid = 0;
|
|
}
|
|
}
|
|
|
|
if (sgid != -1)
|
|
{
|
|
if (rgid == -1)
|
|
{
|
|
if (_hurd_id.aux.ngids >= 1)
|
|
auxs[0] = _hurd_id.aux.gids[0];
|
|
else if (_hurd_id.gen.ngids >= 1)
|
|
auxs[0] = _hurd_id.gen.gids[0];
|
|
else
|
|
/* Not even an effective GID.
|
|
Fall back to the only GID we have. */
|
|
auxs[0] = sgid;
|
|
}
|
|
if (_hurd_id.aux.ngids <= 1)
|
|
{
|
|
/* No saved gids now. The new set will be just UID. */
|
|
newaux = auxs;
|
|
naux = 2;
|
|
}
|
|
else
|
|
{
|
|
_hurd_id.aux.gids[1] = sgid;
|
|
_hurd_id.valid = 0;
|
|
}
|
|
}
|
|
|
|
err = __USEPORT (AUTH, __auth_makeauth
|
|
(port, NULL, MACH_MSG_TYPE_COPY_SEND, 0,
|
|
_hurd_id.gen.uids, _hurd_id.gen.nuids,
|
|
_hurd_id.aux.uids, _hurd_id.aux.nuids,
|
|
newgen, ngen, newaux, naux,
|
|
&newauth));
|
|
}
|
|
__mutex_unlock (&_hurd_id.lock);
|
|
HURD_CRITICAL_END;
|
|
|
|
if (err)
|
|
return __hurd_fail (err);
|
|
|
|
/* Install the new handle and reauthenticate everything. */
|
|
err = __setauth (newauth);
|
|
__mach_port_deallocate (__mach_task_self (), newauth);
|
|
return err;
|
|
}
|
|
libc_hidden_def (__setresgid)
|
|
weak_alias (__setresgid, setresgid)
|