1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
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/types.h>
44#include "namespace.h"
45#include <sys/acl.h>
46#include "un-namespace.h"
47
48#include <errno.h>
49#include <stdio.h>
50#include <stdlib.h>
51#include <string.h>
52#include <unistd.h>
53
54#include "acl_support.h"
55
56acl_t
57acl_get_file(const char *path_p, acl_type_t type)
58{
59	acl_t	aclp;
60	int	error;
61
62	aclp = acl_init(ACL_MAX_ENTRIES);
63	if (aclp == NULL)
64		return (NULL);
65
66	type = _acl_type_unold(type);
67	error = __acl_get_file(path_p, type, &aclp->ats_acl);
68	if (error) {
69		acl_free(aclp);
70		return (NULL);
71	}
72
73	aclp->ats_acl.acl_maxcnt = ACL_MAX_ENTRIES;
74	_acl_brand_from_type(aclp, type);
75
76	return (aclp);
77}
78
79acl_t
80acl_get_link_np(const char *path_p, acl_type_t type)
81{
82	acl_t	aclp;
83	int	error;
84
85	aclp = acl_init(ACL_MAX_ENTRIES);
86	if (aclp == NULL)
87		return (NULL);
88
89	type = _acl_type_unold(type);
90	error = __acl_get_link(path_p, type, &aclp->ats_acl);
91	if (error) {
92		acl_free(aclp);
93		return (NULL);
94	}
95
96	aclp->ats_acl.acl_maxcnt = ACL_MAX_ENTRIES;
97	_acl_brand_from_type(aclp, type);
98
99	return (aclp);
100}
101
102acl_t
103acl_get_fd(int fd)
104{
105	if (fpathconf(fd, _PC_ACL_NFS4) == 1)
106		return (acl_get_fd_np(fd, ACL_TYPE_NFS4));
107
108	return (acl_get_fd_np(fd, ACL_TYPE_ACCESS));
109}
110
111acl_t
112acl_get_fd_np(int fd, acl_type_t type)
113{
114	acl_t	aclp;
115	int	error;
116
117	aclp = acl_init(ACL_MAX_ENTRIES);
118	if (aclp == NULL)
119		return (NULL);
120
121	type = _acl_type_unold(type);
122	error = ___acl_get_fd(fd, type, &aclp->ats_acl);
123	if (error) {
124		acl_free(aclp);
125		return (NULL);
126	}
127
128	aclp->ats_acl.acl_maxcnt = ACL_MAX_ENTRIES;
129	_acl_brand_from_type(aclp, type);
130
131	return (aclp);
132}
133
134/*
135 * acl_get_permset() (23.4.17): return via permset_p a descriptor to
136 * the permission set in the ACL entry entry_d.
137 */
138int
139acl_get_permset(acl_entry_t entry_d, acl_permset_t *permset_p)
140{
141
142	if (entry_d == NULL || permset_p == NULL) {
143		errno = EINVAL;
144		return (-1);
145	}
146
147	*permset_p = &entry_d->ae_perm;
148
149	return (0);
150}
151
152/*
153 * acl_get_qualifier() (23.4.18): retrieve the qualifier of the tag
154 * for the ACL entry entry_d.
155 */
156void *
157acl_get_qualifier(acl_entry_t entry_d)
158{
159	uid_t *retval;
160
161	if (entry_d == NULL) {
162		errno = EINVAL;
163		return (NULL);
164	}
165
166	switch(entry_d->ae_tag) {
167	case ACL_USER:
168	case ACL_GROUP:
169		retval = malloc(sizeof(uid_t));
170		if (retval == NULL)
171			return (NULL);
172		*retval = entry_d->ae_id;
173		return (retval);
174	}
175
176	errno = EINVAL;
177	return (NULL);
178}
179
180/*
181 * acl_get_tag_type() (23.4.19): return the tag type for the ACL
182 * entry entry_p.
183 */
184int
185acl_get_tag_type(acl_entry_t entry_d, acl_tag_t *tag_type_p)
186{
187
188	if (entry_d == NULL || tag_type_p == NULL) {
189		errno = EINVAL;
190		return (-1);
191	}
192
193	*tag_type_p = entry_d->ae_tag;
194
195	return (0);
196}
197
198int
199acl_get_entry_type_np(acl_entry_t entry_d, acl_entry_type_t *entry_type_p)
200{
201
202	if (entry_d == NULL || entry_type_p == NULL) {
203		errno = EINVAL;
204		return (-1);
205	}
206
207	if (!_entry_brand_may_be(entry_d, ACL_BRAND_NFS4)) {
208		errno = EINVAL;
209		return (-1);
210	}
211
212	*entry_type_p = entry_d->ae_entry_type;
213
214	return (0);
215}
216