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0d5cb2c7 | 1 | /* setresuid -- set real user ID, effective user ID, and saved-set user ID |
688903eb | 2 | Copyright (C) 2002-2018 Free Software Foundation, Inc. |
747bf98e RM |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
59ba27a6 PE |
16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. */ | |
747bf98e RM |
18 | |
19 | #include <errno.h> | |
20 | #include <unistd.h> | |
21 | #include <hurd.h> | |
22 | #include <hurd/id.h> | |
23 | ||
0d5cb2c7 RM |
24 | /* Set the real user ID, effective user ID, and saved-set user ID, |
25 | of the calling process to RUID, EUID, and SUID, respectively. */ | |
747bf98e | 26 | int |
0d5cb2c7 | 27 | __setresuid (uid_t ruid, uid_t euid, uid_t suid) |
747bf98e RM |
28 | { |
29 | auth_t newauth; | |
30 | error_t err; | |
747bf98e RM |
31 | |
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 EUID as the first element in the | |
3faebe6a | 39 | list of effective uids. */ |
747bf98e | 40 | |
3faebe6a ST |
41 | uid_t *newgen, *newaux; |
42 | uid_t auxs[2] = { ruid, suid }; | |
43 | size_t ngen, naux; | |
44 | ||
45 | newgen = _hurd_id.gen.uids; | |
46 | ngen = _hurd_id.gen.nuids; | |
47 | if (euid != -1) | |
747bf98e | 48 | { |
3faebe6a ST |
49 | if (_hurd_id.gen.nuids == 0) |
50 | { | |
51 | /* No effective uids now. The new set will be just UID. */ | |
52 | newgen = &euid; | |
53 | ngen = 1; | |
54 | } | |
55 | else | |
56 | { | |
57 | _hurd_id.gen.uids[0] = euid; | |
58 | _hurd_id.valid = 0; | |
59 | } | |
747bf98e | 60 | } |
3faebe6a ST |
61 | |
62 | newaux = _hurd_id.aux.uids; | |
63 | naux = _hurd_id.aux.nuids; | |
64 | if (ruid != -1) | |
65 | { | |
66 | if (_hurd_id.aux.nuids == 0) | |
67 | { | |
68 | newaux = &ruid; | |
69 | naux = 1; | |
70 | } | |
71 | else | |
72 | { | |
73 | _hurd_id.aux.uids[0] = ruid; | |
74 | _hurd_id.valid = 0; | |
75 | } | |
76 | } | |
77 | ||
78 | if (suid != -1) | |
747bf98e | 79 | { |
3faebe6a ST |
80 | if (ruid == -1) |
81 | { | |
82 | if (_hurd_id.aux.nuids >= 1) | |
83 | auxs[0] = _hurd_id.aux.uids[0]; | |
84 | else if (_hurd_id.gen.nuids >= 1) | |
85 | auxs[0] = _hurd_id.gen.uids[0]; | |
86 | else | |
87 | /* Not even an effective UID. | |
88 | Fall back to the only UID we have. */ | |
89 | auxs[0] = suid; | |
90 | } | |
91 | if (_hurd_id.aux.nuids <= 1) | |
92 | { | |
93 | /* No saved uids now. The new set will be just UID. */ | |
94 | newaux = auxs; | |
95 | naux = 2; | |
96 | } | |
97 | else | |
98 | { | |
99 | _hurd_id.aux.uids[1] = suid; | |
100 | _hurd_id.valid = 0; | |
101 | } | |
747bf98e RM |
102 | } |
103 | ||
104 | err = __USEPORT (AUTH, __auth_makeauth | |
105 | (port, NULL, MACH_MSG_TYPE_COPY_SEND, 0, | |
3faebe6a | 106 | newgen, ngen, newaux, naux, |
747bf98e RM |
107 | _hurd_id.gen.gids, _hurd_id.gen.ngids, |
108 | _hurd_id.aux.gids, _hurd_id.aux.ngids, | |
109 | &newauth)); | |
110 | } | |
111 | ||
112 | __mutex_unlock (&_hurd_id.lock); | |
113 | HURD_CRITICAL_END; | |
114 | ||
115 | if (err) | |
116 | return __hurd_fail (err); | |
117 | ||
118 | /* Install the new handle and reauthenticate everything. */ | |
119 | err = __setauth (newauth); | |
120 | __mach_port_deallocate (__mach_task_self (), newauth); | |
121 | return err; | |
122 | } | |
123 | libc_hidden_def (__setresuid) | |
0d7344df | 124 | weak_alias (__setresuid, setresuid) |