1 | /* Copyright (C) 1993-2022 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. |
3 | |
4 | The GNU C Library is free software; you can redistribute it and/or |
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. |
8 | |
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 |
12 | Lesser General Public License for more details. |
13 | |
14 | You should have received a copy of the GNU Lesser General Public |
15 | License along with the GNU C Library; if not, see |
16 | <https://www.gnu.org/licenses/>. */ |
17 | |
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 |
26 | __setreuid (uid_t ruid, uid_t euid) |
27 | { |
28 | auth_t newauth; |
29 | error_t err; |
30 | |
31 | retry: |
32 | HURD_CRITICAL_BEGIN; |
33 | __mutex_lock (&_hurd_id.lock); |
34 | err = _hurd_check_ids (); |
35 | |
36 | if (!err) |
37 | { |
38 | /* Make a new auth handle which has RUID as the real uid, |
39 | and EUID as the first element in the list of effective uids. */ |
40 | |
41 | uid_t *newgen, *newaux; |
42 | size_t ngen, naux; |
43 | |
44 | newgen = _hurd_id.gen.uids; |
45 | ngen = _hurd_id.gen.nuids; |
46 | if (euid != -1) |
47 | { |
48 | if (_hurd_id.gen.nuids == 0) |
49 | { |
50 | /* No effective uids now. The new set will be just UID. */ |
51 | newgen = &euid; |
52 | ngen = 1; |
53 | } |
54 | else |
55 | { |
56 | _hurd_id.gen.uids[0] = euid; |
57 | _hurd_id.valid = 0; |
58 | } |
59 | } |
60 | |
61 | newaux = _hurd_id.aux.uids; |
62 | naux = _hurd_id.aux.nuids; |
63 | if (ruid != -1) |
64 | { |
65 | if (_hurd_id.aux.nuids == 0) |
66 | { |
67 | newaux = &ruid; |
68 | naux = 1; |
69 | } |
70 | else |
71 | { |
72 | _hurd_id.aux.uids[0] = ruid; |
73 | _hurd_id.valid = 0; |
74 | } |
75 | } |
76 | |
77 | err = __USEPORT (AUTH, __auth_makeauth |
78 | (port, NULL, MACH_MSG_TYPE_COPY_SEND, 0, |
79 | newgen, ngen, newaux, naux, |
80 | _hurd_id.gen.gids, _hurd_id.gen.ngids, |
81 | _hurd_id.aux.gids, _hurd_id.aux.ngids, |
82 | &newauth)); |
83 | } |
84 | __mutex_unlock (&_hurd_id.lock); |
85 | HURD_CRITICAL_END; |
86 | if (err == EINTR) |
87 | /* Got a signal while inside an RPC of the critical section, retry again */ |
88 | goto retry; |
89 | |
90 | if (err) |
91 | return __hurd_fail (err); |
92 | |
93 | /* Install the new handle and reauthenticate everything. */ |
94 | err = __setauth (newauth); |
95 | __mach_port_deallocate (__mach_task_self (), newauth); |
96 | return err; |
97 | } |
98 | |
99 | weak_alias (__setreuid, setreuid) |
100 | |