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b168057a | 1 | /* Copyright (C) 1991-2015 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) |