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
38static int
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 */
56int
57acl_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 */
77int
78acl_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 */
95int
96acl_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
112int
113acl_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