1 /*
2 * Copyright (c) 2001-2002 Chris D. Faulhaber
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
29
30 #include <sys/types.h>
31 #include "namespace.h"
32 #include <sys/acl.h>
33 #include "un-namespace.h"
34
35 #include <errno.h>
36 #include <string.h>
37
38 static int
_perm_is_invalid(acl_perm_t perm)39 _perm_is_invalid(acl_perm_t perm)
40 {
41
42 /* Check if more than a single bit is set. */
43 if ((perm & -perm) == perm &&
44 (perm & (ACL_POSIX1E_BITS | ACL_NFS4_PERM_BITS)) == perm)
45 return (0);
46
47 errno = EINVAL;
48
49 return (1);
50 }
51
52 /*
53 * acl_add_perm() (23.4.1): add the permission contained in perm to the
54 * permission set permset_d
55 */
56 int
acl_add_perm(acl_permset_t permset_d,acl_perm_t perm)57 acl_add_perm(acl_permset_t permset_d, acl_perm_t perm)
58 {
59
60 if (permset_d == NULL) {
61 errno = EINVAL;
62 return (-1);
63 }
64
65 if (_perm_is_invalid(perm))
66 return (-1);
67
68 *permset_d |= perm;
69
70 return (0);
71 }
72
73 /*
74 * acl_clear_perms() (23.4.3): clear all permisions from the permission
75 * set permset_d
76 */
77 int
acl_clear_perms(acl_permset_t permset_d)78 acl_clear_perms(acl_permset_t permset_d)
79 {
80
81 if (permset_d == NULL) {
82 errno = EINVAL;
83 return (-1);
84 }
85
86 *permset_d = ACL_PERM_NONE;
87
88 return (0);
89 }
90
91 /*
92 * acl_delete_perm() (23.4.10): remove the permission in perm from the
93 * permission set permset_d
94 */
95 int
acl_delete_perm(acl_permset_t permset_d,acl_perm_t perm)96 acl_delete_perm(acl_permset_t permset_d, acl_perm_t perm)
97 {
98
99 if (permset_d == NULL) {
100 errno = EINVAL;
101 return (-1);
102 }
103
104 if (_perm_is_invalid(perm))
105 return (-1);
106
107 *permset_d &= ~perm;
108
109 return (0);
110 }
111
112 int
acl_get_perm_np(acl_permset_t permset_d,acl_perm_t perm)113 acl_get_perm_np(acl_permset_t permset_d, acl_perm_t perm)
114 {
115
116 if (permset_d == NULL) {
117 errno = EINVAL;
118 return (-1);
119 }
120
121 if (_perm_is_invalid(perm))
122 return (-1);
123
124 if (*permset_d & perm)
125 return (1);
126
127 return (0);
128 }
129