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ebbad4cc UD |
1 | /* Copyright (C) 1993, 1994, 1995, 1997 Free Software Foundation, Inc. |
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 AJ |
14 | You should have received a copy of the GNU Lesser General Public |
15 | License along with the GNU C Library; if not, write to the Free | |
16 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
17 | 02111-1307 USA. */ | |
28f540f4 | 18 | |
28f540f4 RM |
19 | #include <errno.h> |
20 | #include <sys/types.h> | |
21 | #include <unistd.h> | |
22 | #include <hurd.h> | |
23 | #include <hurd/id.h> | |
24 | #include <string.h> | |
25 | ||
26 | int | |
ebbad4cc UD |
27 | __setreuid (ruid, euid) |
28 | uid_t ruid; | |
29 | uid_t euid; | |
28f540f4 RM |
30 | { |
31 | auth_t newauth; | |
32 | error_t err; | |
33 | ||
34 | HURD_CRITICAL_BEGIN; | |
35 | __mutex_lock (&_hurd_id.lock); | |
36 | err = _hurd_check_ids (); | |
37 | ||
38 | if (!err) | |
39 | { | |
40 | /* Make a new auth handle which has RUID as the real uid, | |
41 | and EUID as the first element in the list of effective uids. */ | |
42 | ||
97532098 RM |
43 | uid_t *newgen, *newaux; |
44 | size_t ngen, naux; | |
28f540f4 | 45 | |
97532098 RM |
46 | newgen = _hurd_id.gen.uids; |
47 | ngen = _hurd_id.gen.nuids; | |
48 | if (euid != -1) | |
49 | { | |
50 | if (_hurd_id.gen.nuids == 0) | |
51 | { | |
52 | /* No effective uids now. The new set will be just UID. */ | |
53 | newgen = &euid; | |
54 | ngen = 1; | |
55 | } | |
56 | else | |
57 | { | |
58 | _hurd_id.gen.uids[0] = euid; | |
59 | _hurd_id.valid = 0; | |
60 | } | |
61 | } | |
62 | ||
63 | newaux = _hurd_id.aux.uids; | |
64 | naux = _hurd_id.aux.nuids; | |
65 | if (ruid != -1) | |
66 | { | |
67 | if (_hurd_id.aux.nuids == 0) | |
68 | { | |
69 | newaux = &ruid; | |
70 | naux = 1; | |
71 | } | |
72 | else | |
73 | { | |
74 | _hurd_id.aux.uids[0] = ruid; | |
75 | _hurd_id.valid = 0; | |
76 | } | |
77 | } | |
28f540f4 RM |
78 | |
79 | err = __USEPORT (AUTH, __auth_makeauth | |
80 | (port, NULL, MACH_MSG_TYPE_COPY_SEND, 0, | |
97532098 | 81 | newgen, ngen, newaux, naux, |
28f540f4 RM |
82 | _hurd_id.gen.gids, _hurd_id.gen.ngids, |
83 | _hurd_id.aux.gids, _hurd_id.aux.ngids, | |
84 | &newauth)); | |
85 | } | |
86 | __mutex_unlock (&_hurd_id.lock); | |
87 | HURD_CRITICAL_END; | |
88 | ||
89 | if (err) | |
90 | return __hurd_fail (err); | |
91 | ||
92 | /* Install the new handle and reauthenticate everything. */ | |
93 | err = __setauth (newauth); | |
94 | __mach_port_deallocate (__mach_task_self (), newauth); | |
95 | return err; | |
96 | } | |
97 | ||
98 | weak_alias (__setreuid, setreuid) |