1 /*-
2 * Copyright (c) 2008, 2009 Edward Tomasz Napierała <trasz@FreeBSD.org>
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 THE 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: stable/9/lib/libc/posix1e/acl_branding.c 208034 2010-05-13 16:44:27Z trasz $");
29
30 #include <assert.h>
31 #include <errno.h>
32 #include <sys/acl.h>
33
34 #include "acl_support.h"
35
36 /*
37 * An ugly detail of the implementation - fortunately not visible
38 * to the API users - is the "branding": libc needs to keep track
39 * of what "brand" ACL is: NFSv4, POSIX.1e or unknown. It happens
40 * automatically - for example, during acl_get_file(3) ACL gets
41 * branded according to the "type" argument; during acl_set_permset
42 * ACL, if its brand is unknown it gets branded as NFSv4 if any of the
43 * NFSv4 permissions that are not valid for POSIX.1e ACL are set etc.
44 * Branding information is used for printing out the ACL (acl_to_text(3)),
45 * veryfying acl_set_whatever arguments (checking against setting
46 * bits that are valid only for NFSv4 in ACL branded as POSIX.1e) etc.
47 */
48
49 static acl_t
entry2acl(acl_entry_t entry)50 entry2acl(acl_entry_t entry)
51 {
52 acl_t aclp;
53
54 aclp = (acl_t)(((long)entry >> _ACL_T_ALIGNMENT_BITS) << _ACL_T_ALIGNMENT_BITS);
55
56 return (aclp);
57 }
58
59 /*
60 * Return brand of an ACL.
61 */
62 int
_acl_brand(const acl_t acl)63 _acl_brand(const acl_t acl)
64 {
65
66 return (acl->ats_brand);
67 }
68
69 int
_entry_brand(const acl_entry_t entry)70 _entry_brand(const acl_entry_t entry)
71 {
72
73 return (_acl_brand(entry2acl(entry)));
74 }
75
76 /*
77 * Return 1, iff branding ACL as "brand" is ok.
78 */
79 int
_acl_brand_may_be(const acl_t acl,int brand)80 _acl_brand_may_be(const acl_t acl, int brand)
81 {
82
83 if (_acl_brand(acl) == ACL_BRAND_UNKNOWN)
84 return (1);
85
86 if (_acl_brand(acl) == brand)
87 return (1);
88
89 return (0);
90 }
91
92 int
_entry_brand_may_be(const acl_entry_t entry,int brand)93 _entry_brand_may_be(const acl_entry_t entry, int brand)
94 {
95
96 return (_acl_brand_may_be(entry2acl(entry), brand));
97 }
98
99 /*
100 * Brand ACL as "brand".
101 */
102 void
_acl_brand_as(acl_t acl,int brand)103 _acl_brand_as(acl_t acl, int brand)
104 {
105
106 assert(_acl_brand_may_be(acl, brand));
107
108 acl->ats_brand = brand;
109 }
110
111 void
_entry_brand_as(const acl_entry_t entry,int brand)112 _entry_brand_as(const acl_entry_t entry, int brand)
113 {
114
115 _acl_brand_as(entry2acl(entry), brand);
116 }
117
118 int
_acl_type_not_valid_for_acl(const acl_t acl,acl_type_t type)119 _acl_type_not_valid_for_acl(const acl_t acl, acl_type_t type)
120 {
121
122 switch (_acl_brand(acl)) {
123 case ACL_BRAND_NFS4:
124 if (type == ACL_TYPE_NFS4)
125 return (0);
126 break;
127
128 case ACL_BRAND_POSIX:
129 if (type == ACL_TYPE_ACCESS || type == ACL_TYPE_DEFAULT)
130 return (0);
131 break;
132
133 case ACL_BRAND_UNKNOWN:
134 return (0);
135 }
136
137 return (-1);
138 }
139
140 void
_acl_brand_from_type(acl_t acl,acl_type_t type)141 _acl_brand_from_type(acl_t acl, acl_type_t type)
142 {
143
144 switch (type) {
145 case ACL_TYPE_NFS4:
146 _acl_brand_as(acl, ACL_BRAND_NFS4);
147 break;
148 case ACL_TYPE_ACCESS:
149 case ACL_TYPE_DEFAULT:
150 _acl_brand_as(acl, ACL_BRAND_POSIX);
151 break;
152 default:
153 /* XXX: What to do here? */
154 break;
155 }
156 }
157
158 int
acl_get_brand_np(acl_t acl,int * brand_p)159 acl_get_brand_np(acl_t acl, int *brand_p)
160 {
161
162 if (acl == NULL || brand_p == NULL) {
163 errno = EINVAL;
164 return (-1);
165 }
166 *brand_p = _acl_brand(acl);
167
168 return (0);
169 }
170