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b168057a | 1 | /* Copyright (C) 1993-2015 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 <sys/types.h> | |
20 | #include <unistd.h> | |
21 | #include <hurd.h> | |
22 | #include <hurd/id.h> | |
23 | #include <string.h> | |
24 | ||
25 | int | |
bd2260a2 | 26 | __setregid (gid_t rgid, gid_t egid) |
28f540f4 RM |
27 | { |
28 | auth_t newauth; | |
29 | error_t err; | |
30 | ||
31 | HURD_CRITICAL_BEGIN; | |
32 | __mutex_lock (&_hurd_id.lock); | |
33 | err = _hurd_check_ids (); | |
34 | ||
35 | if (!err) | |
36 | { | |
37 | /* Make a new auth handle which has RGID as the real gid, | |
38 | and EGID as the first element in the list of effective gids. */ | |
39 | ||
97532098 RM |
40 | gid_t *newgen, *newaux; |
41 | size_t ngen, naux; | |
28f540f4 | 42 | |
97532098 RM |
43 | newgen = _hurd_id.gen.gids; |
44 | ngen = _hurd_id.gen.ngids; | |
45 | if (egid != -1) | |
46 | { | |
47 | if (_hurd_id.gen.ngids == 0) | |
48 | { | |
49 | /* No effective gids now. The new set will be just GID. */ | |
50 | newgen = &egid; | |
51 | ngen = 1; | |
52 | } | |
53 | else | |
54 | { | |
55 | _hurd_id.gen.gids[0] = egid; | |
56 | _hurd_id.valid = 0; | |
57 | } | |
58 | } | |
59 | ||
60 | newaux = _hurd_id.aux.gids; | |
61 | naux = _hurd_id.aux.ngids; | |
62 | if (rgid != -1) | |
63 | { | |
64 | if (_hurd_id.aux.ngids == 0) | |
65 | { | |
66 | newaux = &rgid; | |
67 | naux = 1; | |
68 | } | |
69 | else | |
70 | { | |
71 | _hurd_id.aux.gids[0] = rgid; | |
72 | _hurd_id.valid = 0; | |
73 | } | |
74 | } | |
28f540f4 RM |
75 | |
76 | err = __USEPORT (AUTH, __auth_makeauth | |
77 | (port, NULL, MACH_MSG_TYPE_COPY_SEND, 0, | |
97532098 RM |
78 | _hurd_id.gen.uids, _hurd_id.gen.nuids, |
79 | _hurd_id.aux.uids, _hurd_id.aux.nuids, | |
80 | newgen, ngen, newaux, naux, | |
28f540f4 RM |
81 | &newauth)); |
82 | } | |
83 | __mutex_unlock (&_hurd_id.lock); | |
84 | HURD_CRITICAL_END; | |
85 | ||
86 | if (err) | |
87 | return __hurd_fail (err); | |
88 | ||
89 | /* Install the new handle and reauthenticate everything. */ | |
90 | err = __setauth (newauth); | |
91 | __mach_port_deallocate (__mach_task_self (), newauth); | |
92 | return err; | |
93 | } | |
94 | ||
95 | weak_alias (__setregid, setregid) |