projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| d4697bc9 | 1 | /* Copyright (C) 1991-2014 Free Software Foundation, Inc. |
| ebbad4cc | 2 | This file is part of the GNU C Library. |
| 28f540f4 | 3 | |
| ebbad4cc | 4 | The GNU C Library is free software; you can redistribute it and/or |
| 41bdb6e2 AJ |
5 | modify it under the terms of the GNU Lesser General Public |
| 6 | License as published by the Free Software Foundation; either | |
| 7 | version 2.1 of the License, or (at your option) any later version. | |
| 28f540f4 | 8 | |
| ebbad4cc UD |
9 | The GNU C Library is distributed in the hope that it will be useful, |
| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 41bdb6e2 | 12 | Lesser General Public License for more details. |
| 28f540f4 | 13 | |
| 41bdb6e2 | 14 | You should have received a copy of the GNU Lesser General Public |
| 59ba27a6 PE |
15 | License along with the GNU C Library; if not, see |
| 16 | <http://www.gnu.org/licenses/>. */ | |
| 28f540f4 | 17 | |
| 28f540f4 RM |
18 | #include <errno.h> |
| 19 | #include <unistd.h> | |
| 20 | #include <sys/types.h> | |
| 21 | #include <hurd.h> | |
| 22 | #include <hurd/id.h> | |
| 23 | #include <string.h> | |
| 24 | ||
| 25 | /* Set the user ID of the calling process to UID. | |
| 26 | If the calling process is the super-user, the real | |
| 27 | and effective user IDs, and the saved set-user-ID to UID; | |
| 28 | if not, the effective user ID is set to UID. */ | |
| 29 | int | |
| ebbad4cc UD |
30 | __setuid (uid) |
| 31 | uid_t uid; | |
| 28f540f4 RM |
32 | { |
| 33 | auth_t newauth; | |
| 34 | error_t err; | |
| 35 | ||
| 36 | HURD_CRITICAL_BEGIN; | |
| 37 | __mutex_lock (&_hurd_id.lock); | |
| 38 | err = _hurd_check_ids (); | |
| 39 | ||
| 40 | if (!err) | |
| 41 | { | |
| 42 | /* Make a new auth handle which has UID as the real uid, | |
| 43 | and as the first element in the list of effective uids. */ | |
| 44 | ||
| 97532098 RM |
45 | uid_t *newgen, *newaux, auxbuf[2]; |
| 46 | size_t ngen, naux; | |
| 47 | ||
| 48 | newaux = _hurd_id.aux.uids; | |
| 49 | naux = _hurd_id.aux.nuids; | |
| 50 | if (_hurd_id.gen.nuids == 0) | |
| 51 | { | |
| 52 | /* No effective uids now. The new set will be just UID. */ | |
| 53 | newgen = &uid; | |
| 54 | ngen = 1; | |
| 55 | } | |
| 56 | else if (_hurd_id.gen.uids[0] == 0) | |
| 57 | { | |
| 58 | /* We are root; set the effective, real, and saved to UID. */ | |
| 59 | _hurd_id.gen.uids[0] = uid; | |
| 60 | _hurd_id.valid = 0; | |
| 61 | newgen = _hurd_id.gen.uids; | |
| 62 | ngen = _hurd_id.gen.nuids; | |
| 63 | if (_hurd_id.aux.nuids < 2) | |
| 64 | { | |
| 65 | newaux = auxbuf; | |
| 66 | naux = 2; | |
| 67 | } | |
| 2114e10a | 68 | newaux[0] = newaux[1] = uid; |
| 97532098 RM |
69 | } |
| 70 | else | |
| 71 | { | |
| 72 | /* We are not root; just change the effective UID. */ | |
| ebbad4cc UD |
73 | /* XXX that implies an unprivileged setuid(0) will give |
| 74 | the caller root, no questions asked! */ | |
| 97532098 RM |
75 | _hurd_id.gen.uids[0] = uid; |
| 76 | _hurd_id.valid = 0; | |
| 77 | newgen = _hurd_id.gen.uids; | |
| 78 | ngen = _hurd_id.gen.nuids; | |
| 79 | } | |
| 28f540f4 RM |
80 | |
| 81 | err = __USEPORT (AUTH, __auth_makeauth | |
| 46bdf16b | 82 | (port, NULL, MACH_MSG_TYPE_COPY_SEND, 0, |
| 97532098 | 83 | newgen, ngen, newaux, naux, |
| 567676ff MB |
84 | _hurd_id.gen.gids, _hurd_id.gen.ngids, |
| 85 | _hurd_id.aux.gids, _hurd_id.aux.ngids, | |
| 28f540f4 RM |
86 | &newauth)); |
| 87 | } | |
| 88 | __mutex_unlock (&_hurd_id.lock); | |
| 89 | HURD_CRITICAL_END; | |
| 90 | ||
| 91 | if (err) | |
| 92 | return __hurd_fail (err); | |
| 93 | ||
| 94 | /* Install the new handle and reauthenticate everything. */ | |
| 95 | err = __setauth (newauth); | |
| 96 | __mach_port_deallocate (__mach_task_self (), newauth); | |
| 97 | return err; | |
| 98 | } | |
| 99 | ||
| 100 | weak_alias (__setuid, setuid) |