| /* Copyright (C) 1991-2014 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 <sys/types.h> |
| #include <hurd.h> |
| #include <hurd/id.h> |
| #include <string.h> |
| |
| /* Set the group ID of the calling process to UID. |
| If the calling process is the super-user, the real |
| and effective group IDs, and the saved set-group-ID to UID; |
| if not, the effective group ID is set to GID. */ |
| int |
| __setgid (gid) |
| gid_t gid; |
| { |
| 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 GID as the real gid, |
| and as the first element in the list of effective gids. */ |
| |
| gid_t *newgen, *newaux, auxbuf[2]; |
| size_t ngen, naux; |
| |
| if (_hurd_id.gen.ngids == 0) |
| { |
| /* No effective gids now. The new set will be just GID. */ |
| newgen = &gid; |
| ngen = 1; |
| } |
| else |
| { |
| _hurd_id.gen.gids[0] = gid; |
| _hurd_id.valid = 0; |
| newgen = _hurd_id.gen.gids; |
| ngen = _hurd_id.gen.ngids; |
| } |
| |
| newaux = _hurd_id.aux.gids; |
| naux = _hurd_id.aux.ngids; |
| if (_hurd_id.gen.nuids > 0 && _hurd_id.gen.uids[0] == 0) |
| { |
| /* We are root; set the real and saved IDs too. */ |
| _hurd_id.valid = 0; |
| if (_hurd_id.aux.ngids < 2) |
| { |
| newaux = auxbuf; |
| naux = 2; |
| } |
| newaux[0] = newaux[1] = gid; |
| } |
| |
| 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; |
| } |
| |
| weak_alias (__setgid, setgid) |