| /* Copyright (C) 1991, 92, 93, 94, 95, 97 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, write to the Free |
| Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. */ |
| |
| #include <errno.h> |
| #include <unistd.h> |
| #include <sys/types.h> |
| #include <hurd.h> |
| #include <hurd/id.h> |
| #include <string.h> |
| |
| /* Set the user ID of the calling process to UID. |
| If the calling process is the super-user, the real |
| and effective user IDs, and the saved set-user-ID to UID; |
| if not, the effective user ID is set to UID. */ |
| int |
| __setuid (uid) |
| uid_t uid; |
| { |
| 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 UID as the real uid, |
| and as the first element in the list of effective uids. */ |
| |
| uid_t *newgen, *newaux, auxbuf[2]; |
| size_t ngen, naux; |
| |
| newaux = _hurd_id.aux.uids; |
| naux = _hurd_id.aux.nuids; |
| if (_hurd_id.gen.nuids == 0) |
| { |
| /* No effective uids now. The new set will be just UID. */ |
| newgen = &uid; |
| ngen = 1; |
| } |
| else if (_hurd_id.gen.uids[0] == 0) |
| { |
| /* We are root; set the effective, real, and saved to UID. */ |
| _hurd_id.gen.uids[0] = uid; |
| _hurd_id.valid = 0; |
| newgen = _hurd_id.gen.uids; |
| ngen = _hurd_id.gen.nuids; |
| if (_hurd_id.aux.nuids < 2) |
| { |
| newaux = auxbuf; |
| naux = 2; |
| } |
| newaux[0] = newaux[1] = uid; |
| } |
| else |
| { |
| /* We are not root; just change the effective UID. */ |
| /* XXX that implies an unprivileged setuid(0) will give |
| the caller root, no questions asked! */ |
| _hurd_id.gen.uids[0] = uid; |
| _hurd_id.valid = 0; |
| newgen = _hurd_id.gen.uids; |
| ngen = _hurd_id.gen.nuids; |
| } |
| |
| err = __USEPORT (AUTH, __auth_makeauth |
| (port, NULL, MACH_MSG_TYPE_COPY_SEND, 0, |
| newgen, ngen, newaux, naux, |
| _hurd_id.gen.gids, _hurd_id.gen.ngids, |
| _hurd_id.aux.gids, _hurd_id.aux.ngids, |
| &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 (__setuid, setuid) |