acl_get.c revision 194955 
1/*-
2 * Copyright (c) 1999, 2000, 2001, 2002 Robert N. M. Watson
3 * All rights reserved.
4 *
5 * This software was developed by Robert Watson for the TrustedBSD Project.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28/*
29 * acl_get_fd - syscall wrapper for retrieving access ACL by fd
30 * acl_get_fd_np - syscall wrapper for retrieving ACL by fd (non-POSIX)
31 * acl_get_file - syscall wrapper for retrieving ACL by filename
32 * acl_get_link_np - syscall wrapper for retrieving ACL by filename (NOFOLLOW)
33 *                   (non-POSIX)
34 * acl_get_perm_np() checks if a permission is in the specified
35 *                   permset (non-POSIX)
36 * acl_get_permset() returns the permission set in the ACL entry
37 * acl_get_qualifier() retrieves the qualifier of the tag from the ACL entry
38 * acl_get_tag_type() returns the tag type for the ACL entry entry_d
39 */
40
41#include <sys/cdefs.h>
42__FBSDID("$FreeBSD: head/lib/libc/posix1e/acl_get.c 194955 2009-06-25 12:46:59Z trasz $");
43
44#include <sys/types.h>
45#include "namespace.h"
46#include <sys/acl.h>
47#include "un-namespace.h"
48
49#include <errno.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))
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
134int
135acl_get_perm_np(acl_permset_t permset_d, acl_perm_t perm)
136{
137
138	if (permset_d == NULL) {
139		errno = EINVAL;
140		return (-1);
141	}
142
143	switch(perm) {
144	case ACL_READ:
145	case ACL_WRITE:
146	case ACL_EXECUTE:
147		if (*permset_d & perm)
148			return (1);
149		break;
150	default:
151		errno = EINVAL;
152		return (-1);
153	}
154
155	return (0);
156}
157
158/*
159 * acl_get_permset() (23.4.17): return via permset_p a descriptor to
160 * the permission set in the ACL entry entry_d.
161 */
162int
163acl_get_permset(acl_entry_t entry_d, acl_permset_t *permset_p)
164{
165
166	if (entry_d == NULL || permset_p == NULL) {
167		errno = EINVAL;
168		return (-1);
169	}
170
171	*permset_p = &entry_d->ae_perm;
172
173	return (0);
174}
175
176/*
177 * acl_get_qualifier() (23.4.18): retrieve the qualifier of the tag
178 * for the ACL entry entry_d.
179 */
180void *
181acl_get_qualifier(acl_entry_t entry_d)
182{
183	uid_t *retval;
184
185	if (entry_d == NULL) {
186		errno = EINVAL;
187		return (NULL);
188	}
189
190	switch(entry_d->ae_tag) {
191	case ACL_USER:
192	case ACL_GROUP:
193		retval = malloc(sizeof(uid_t));
194		if (retval == NULL)
195			return (NULL);
196		*retval = entry_d->ae_id;
197		return (retval);
198	}
199
200	errno = EINVAL;
201	return (NULL);
202}
203
204/*
205 * acl_get_tag_type() (23.4.19): return the tag type for the ACL
206 * entry entry_p.
207 */
208int
209acl_get_tag_type(acl_entry_t entry_d, acl_tag_t *tag_type_p)
210{
211
212	if (entry_d == NULL || tag_type_p == NULL) {
213		errno = EINVAL;
214		return (-1);
215	}
216
217	*tag_type_p = entry_d->ae_tag;
218
219	return (0);
220}
221
222int
223acl_get_entry_type_np(acl_entry_t entry_d, acl_entry_type_t *entry_type_p)
224{
225
226	if (entry_d == NULL || entry_type_p == NULL) {
227		errno = EINVAL;
228		return (-1);
229	}
230
231	if (!_entry_brand_may_be(entry_d, ACL_BRAND_NFS4)) {
232		errno = EINVAL;
233		return (-1);
234	}
235
236	*entry_type_p = entry_d->ae_entry_type;
237
238	return (0);
239}
240