remove.c revision 99110 
1/*
2 * Copyright (c) 2001 Chris D. Faulhaber
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 THE VOICES IN HIS HEAD BE
18 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
19 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
20 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
21 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
22 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
23 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
24 * POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: head/bin/setfacl/remove.c 99110 2002-06-30 05:15:05Z obrien $");
29
30#include <sys/types.h>
31#include <sys/acl.h>
32#include <sys/stat.h>
33
34#include <err.h>
35#include <stdio.h>
36#include <string.h>
37
38#include "setfacl.h"
39
40/*
41 * remove ACL entries from an ACL
42 */
43int
44remove_acl(acl_t acl, acl_t *prev_acl)
45{
46	acl_entry_t	entry;
47	acl_t		acl_new;
48	acl_tag_t	tag;
49	int		carried_error, entry_id;
50
51	carried_error = 0;
52
53	if (acl_type == ACL_TYPE_ACCESS)
54		acl_new = acl_dup(prev_acl[ACCESS_ACL]);
55	else
56		acl_new = acl_dup(prev_acl[DEFAULT_ACL]);
57	if (acl_new == NULL)
58		err(1, "acl_dup() failed");
59
60	tag = ACL_UNDEFINED_TAG;
61
62	/* find and delete the entry */
63	entry_id = ACL_FIRST_ENTRY;
64	while (acl_get_entry(acl, entry_id, &entry) == 1) {
65		entry_id = ACL_NEXT_ENTRY;
66		if (acl_get_tag_type(entry, &tag) == -1)
67			err(1, "acl_get_tag_type() failed");
68		if (tag == ACL_MASK)
69			have_mask++;
70		if (acl_delete_entry(acl_new, entry) == -1) {
71			carried_error++;
72			warnx("cannot remove non-existent acl entry");
73		}
74	}
75
76	if (acl_type == ACL_TYPE_ACCESS) {
77		acl_free(prev_acl[ACCESS_ACL]);
78		prev_acl[ACCESS_ACL] = acl_new;
79	} else {
80		acl_free(prev_acl[DEFAULT_ACL]);
81		prev_acl[DEFAULT_ACL] = acl_new;
82	}
83
84	if (carried_error)
85		return (-1);
86
87	return (0);
88}
89
90/*
91 * remove default entries
92 */
93int
94remove_default(acl_t *prev_acl)
95{
96
97	if (prev_acl[1]) {
98		acl_free(prev_acl[1]);
99		prev_acl[1] = acl_init(ACL_MAX_ENTRIES);
100		if (prev_acl[1] == NULL)
101			err(1, "acl_init() failed");
102	} else {
103		warn("cannot remove default ACL");
104		return (-1);
105	}
106	return (0);
107}
108
109/*
110 * remove extended entries
111 */
112void
113remove_ext(acl_t *prev_acl)
114{
115	acl_t acl_new, acl_old;
116	acl_entry_t entry, entry_new;
117	acl_permset_t perm;
118	acl_tag_t tag;
119	int entry_id, have_mask_entry;
120
121	if (acl_type == ACL_TYPE_ACCESS)
122		acl_old = acl_dup(prev_acl[ACCESS_ACL]);
123	else
124		acl_old = acl_dup(prev_acl[DEFAULT_ACL]);
125	if (acl_old == NULL)
126		err(1, "acl_dup() failed");
127
128	have_mask_entry = 0;
129	acl_new = acl_init(ACL_MAX_ENTRIES);
130	if (acl_new == NULL)
131		err(1, "acl_init() failed");
132	tag = ACL_UNDEFINED_TAG;
133
134	/* only save the default user/group/other entries */
135	entry_id = ACL_FIRST_ENTRY;
136	while (acl_get_entry(acl_old, entry_id, &entry) == 1) {
137		entry_id = ACL_NEXT_ENTRY;
138
139		if (acl_get_tag_type(entry, &tag) == -1)
140			err(1, "acl_get_tag_type() failed");
141
142		switch(tag) {
143		case ACL_USER_OBJ:
144		case ACL_GROUP_OBJ:
145		case ACL_OTHER:
146			if (acl_get_tag_type(entry, &tag) == -1)
147				err(1, "acl_get_tag_type() failed");
148			if (acl_get_permset(entry, &perm) == -1)
149				err(1, "acl_get_permset() failed");
150			if (acl_create_entry(&acl_new, &entry_new) == -1)
151				err(1, "acl_create_entry() failed");
152			if (acl_set_tag_type(entry_new, tag) == -1)
153				err(1, "acl_set_tag_type() failed");
154			if (acl_set_permset(entry_new, perm) == -1)
155				err(1, "acl_get_permset() failed");
156			if (acl_copy_entry(entry_new, entry) == -1)
157				err(1, "acl_copy_entry() failed");
158			break;
159		case ACL_MASK:
160			have_mask_entry = 1;
161			break;
162		default:
163			break;
164		}
165	}
166	if (have_mask_entry && n_flag == 0) {
167		if (acl_calc_mask(&acl_new) == -1)
168			err(1, "acl_calc_mask() failed");
169	} else {
170		have_mask = 1;
171	}
172
173	if (acl_type == ACL_TYPE_ACCESS) {
174		acl_free(prev_acl[ACCESS_ACL]);
175		prev_acl[ACCESS_ACL] = acl_new;
176	} else {
177		acl_free(prev_acl[DEFAULT_ACL]);
178		prev_acl[DEFAULT_ACL] = acl_new;
179	}
180}
181