1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 1999, 2000, 2001, 2002 Robert N. M. Watson
5 * All rights reserved.
6 *
7 * This software was developed by Robert Watson for the TrustedBSD Project.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30 /*
31 * acl_get_fd - syscall wrapper for retrieving access ACL by fd
32 * acl_get_fd_np - syscall wrapper for retrieving ACL by fd (non-POSIX)
33 * acl_get_file - syscall wrapper for retrieving ACL by filename
34 * acl_get_link_np - syscall wrapper for retrieving ACL by filename (NOFOLLOW)
35 * (non-POSIX)
36 * acl_get_perm_np() checks if a permission is in the specified
37 * permset (non-POSIX)
38 * acl_get_permset() returns the permission set in the ACL entry
39 * acl_get_qualifier() retrieves the qualifier of the tag from the ACL entry
40 * acl_get_tag_type() returns the tag type for the ACL entry entry_d
41 */
42
43 #include <sys/cdefs.h>
44 #if 0
45 __FBSDID("$FreeBSD: head/lib/libc/posix1e/acl_get.c 326193 2017-11-25 17:12:48Z pfg $");
46 #else
47 __RCSID("$NetBSD: acl_get.c,v 1.1 2020/05/16 18:31:47 christos Exp $");
48 #endif
49
50 #include "namespace.h"
51 #include <sys/types.h>
52 #include <sys/acl.h>
53
54 #include <errno.h>
55 #include <stdio.h>
56 #include <stdlib.h>
57 #include <string.h>
58 #include <unistd.h>
59
60 #include "acl_support.h"
61
62 acl_t
acl_get_file(const char * path_p,acl_type_t type)63 acl_get_file(const char *path_p, acl_type_t type)
64 {
65 acl_t aclp;
66 int error;
67
68 aclp = acl_init(ACL_MAX_ENTRIES);
69 if (aclp == NULL)
70 return (NULL);
71
72 type = _acl_type_unold(type);
73 error = __acl_get_file(path_p, type, &aclp->ats_acl);
74 if (error) {
75 acl_free(aclp);
76 return (NULL);
77 }
78
79 aclp->ats_acl.acl_maxcnt = ACL_MAX_ENTRIES;
80 _acl_brand_from_type(aclp, type);
81
82 return (aclp);
83 }
84
85 acl_t
acl_get_link_np(const char * path_p,acl_type_t type)86 acl_get_link_np(const char *path_p, acl_type_t type)
87 {
88 acl_t aclp;
89 int error;
90
91 aclp = acl_init(ACL_MAX_ENTRIES);
92 if (aclp == NULL)
93 return (NULL);
94
95 type = _acl_type_unold(type);
96 error = __acl_get_link(path_p, type, &aclp->ats_acl);
97 if (error) {
98 acl_free(aclp);
99 return (NULL);
100 }
101
102 aclp->ats_acl.acl_maxcnt = ACL_MAX_ENTRIES;
103 _acl_brand_from_type(aclp, type);
104
105 return (aclp);
106 }
107
108 acl_t
acl_get_fd(int fd)109 acl_get_fd(int fd)
110 {
111 if (fpathconf(fd, _PC_ACL_NFS4) == 1)
112 return (acl_get_fd_np(fd, ACL_TYPE_NFS4));
113
114 return (acl_get_fd_np(fd, ACL_TYPE_ACCESS));
115 }
116
117 acl_t
acl_get_fd_np(int fd,acl_type_t type)118 acl_get_fd_np(int fd, acl_type_t type)
119 {
120 acl_t aclp;
121 int error;
122
123 aclp = acl_init(ACL_MAX_ENTRIES);
124 if (aclp == NULL)
125 return (NULL);
126
127 type = _acl_type_unold(type);
128 error = __acl_get_fd(fd, type, &aclp->ats_acl);
129 if (error) {
130 acl_free(aclp);
131 return (NULL);
132 }
133
134 aclp->ats_acl.acl_maxcnt = ACL_MAX_ENTRIES;
135 _acl_brand_from_type(aclp, type);
136
137 return (aclp);
138 }
139
140 /*
141 * acl_get_permset() (23.4.17): return via permset_p a descriptor to
142 * the permission set in the ACL entry entry_d.
143 */
144 int
acl_get_permset(acl_entry_t entry_d,acl_permset_t * permset_p)145 acl_get_permset(acl_entry_t entry_d, acl_permset_t *permset_p)
146 {
147
148 if (entry_d == NULL || permset_p == NULL) {
149 errno = EINVAL;
150 return (-1);
151 }
152
153 *permset_p = &entry_d->ae_perm;
154
155 return (0);
156 }
157
158 /*
159 * acl_get_qualifier() (23.4.18): retrieve the qualifier of the tag
160 * for the ACL entry entry_d.
161 */
162 void *
acl_get_qualifier(acl_entry_t entry_d)163 acl_get_qualifier(acl_entry_t entry_d)
164 {
165 uid_t *retval;
166
167 if (entry_d == NULL) {
168 errno = EINVAL;
169 return (NULL);
170 }
171
172 switch(entry_d->ae_tag) {
173 case ACL_USER:
174 case ACL_GROUP:
175 retval = malloc(sizeof(uid_t));
176 if (retval == NULL)
177 return (NULL);
178 *retval = entry_d->ae_id;
179 return (retval);
180 }
181
182 errno = EINVAL;
183 return (NULL);
184 }
185
186 /*
187 * acl_get_tag_type() (23.4.19): return the tag type for the ACL
188 * entry entry_p.
189 */
190 int
acl_get_tag_type(acl_entry_t entry_d,acl_tag_t * tag_type_p)191 acl_get_tag_type(acl_entry_t entry_d, acl_tag_t *tag_type_p)
192 {
193
194 if (entry_d == NULL || tag_type_p == NULL) {
195 errno = EINVAL;
196 return (-1);
197 }
198
199 *tag_type_p = entry_d->ae_tag;
200
201 return (0);
202 }
203
204 int
acl_get_entry_type_np(acl_entry_t entry_d,acl_entry_type_t * entry_type_p)205 acl_get_entry_type_np(acl_entry_t entry_d, acl_entry_type_t *entry_type_p)
206 {
207
208 if (entry_d == NULL || entry_type_p == NULL) {
209 errno = EINVAL;
210 return (-1);
211 }
212
213 if (!_entry_brand_may_be(entry_d, ACL_BRAND_NFS4)) {
214 errno = EINVAL;
215 return (-1);
216 }
217
218 *entry_type_p = entry_d->ae_entry_type;
219
220 return (0);
221 }
222