1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2008, 2009 Edward Tomasz Napierała <trasz@FreeBSD.org>
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28 #include <assert.h>
29 #include <errno.h>
30 #include <sys/acl.h>
31
32 #include "acl_support.h"
33
34 /*
35 * An ugly detail of the implementation - fortunately not visible
36 * to the API users - is the "branding": libc needs to keep track
37 * of what "brand" ACL is: NFSv4, POSIX.1e or unknown. It happens
38 * automatically - for example, during acl_get_file(3) ACL gets
39 * branded according to the "type" argument; during acl_set_permset
40 * ACL, if its brand is unknown it gets branded as NFSv4 if any of the
41 * NFSv4 permissions that are not valid for POSIX.1e ACL are set etc.
42 * Branding information is used for printing out the ACL (acl_to_text(3)),
43 * veryfying acl_set_whatever arguments (checking against setting
44 * bits that are valid only for NFSv4 in ACL branded as POSIX.1e) etc.
45 */
46
47 static acl_t
entry2acl(acl_entry_t entry)48 entry2acl(acl_entry_t entry)
49 {
50 acl_t aclp;
51
52 aclp = (acl_t)(((long)entry >> _ACL_T_ALIGNMENT_BITS) << _ACL_T_ALIGNMENT_BITS);
53
54 return (aclp);
55 }
56
57 /*
58 * Return brand of an ACL.
59 */
60 int
_acl_brand(const acl_t acl)61 _acl_brand(const acl_t acl)
62 {
63
64 return (acl->ats_brand);
65 }
66
67 int
_entry_brand(const acl_entry_t entry)68 _entry_brand(const acl_entry_t entry)
69 {
70
71 return (_acl_brand(entry2acl(entry)));
72 }
73
74 /*
75 * Return 1, iff branding ACL as "brand" is ok.
76 */
77 int
_acl_brand_may_be(const acl_t acl,int brand)78 _acl_brand_may_be(const acl_t acl, int brand)
79 {
80
81 if (_acl_brand(acl) == ACL_BRAND_UNKNOWN)
82 return (1);
83
84 if (_acl_brand(acl) == brand)
85 return (1);
86
87 return (0);
88 }
89
90 int
_entry_brand_may_be(const acl_entry_t entry,int brand)91 _entry_brand_may_be(const acl_entry_t entry, int brand)
92 {
93
94 return (_acl_brand_may_be(entry2acl(entry), brand));
95 }
96
97 /*
98 * Brand ACL as "brand".
99 */
100 void
_acl_brand_as(acl_t acl,int brand)101 _acl_brand_as(acl_t acl, int brand)
102 {
103
104 assert(_acl_brand_may_be(acl, brand));
105
106 acl->ats_brand = brand;
107 }
108
109 void
_entry_brand_as(const acl_entry_t entry,int brand)110 _entry_brand_as(const acl_entry_t entry, int brand)
111 {
112
113 _acl_brand_as(entry2acl(entry), brand);
114 }
115
116 int
_acl_type_not_valid_for_acl(const acl_t acl,acl_type_t type)117 _acl_type_not_valid_for_acl(const acl_t acl, acl_type_t type)
118 {
119
120 switch (_acl_brand(acl)) {
121 case ACL_BRAND_NFS4:
122 if (type == ACL_TYPE_NFS4)
123 return (0);
124 break;
125
126 case ACL_BRAND_POSIX:
127 if (type == ACL_TYPE_ACCESS || type == ACL_TYPE_DEFAULT)
128 return (0);
129 break;
130
131 case ACL_BRAND_UNKNOWN:
132 return (0);
133 }
134
135 return (-1);
136 }
137
138 void
_acl_brand_from_type(acl_t acl,acl_type_t type)139 _acl_brand_from_type(acl_t acl, acl_type_t type)
140 {
141
142 switch (type) {
143 case ACL_TYPE_NFS4:
144 _acl_brand_as(acl, ACL_BRAND_NFS4);
145 break;
146 case ACL_TYPE_ACCESS:
147 case ACL_TYPE_DEFAULT:
148 _acl_brand_as(acl, ACL_BRAND_POSIX);
149 break;
150 default:
151 /* XXX: What to do here? */
152 break;
153 }
154 }
155
156 int
acl_get_brand_np(acl_t acl,int * brand_p)157 acl_get_brand_np(acl_t acl, int *brand_p)
158 {
159
160 if (acl == NULL || brand_p == NULL) {
161 errno = EINVAL;
162 return (-1);
163 }
164 *brand_p = _acl_brand(acl);
165
166 return (0);
167 }
168