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 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("$FreeBSD$");
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, const char *filename)
45{
46	acl_entry_t	entry;
47	acl_t		acl_new;
48	acl_tag_t	tag;
49	int		carried_error, entry_id, acl_brand, prev_acl_brand;
50
51	carried_error = 0;
52
53	acl_get_brand_np(acl, &acl_brand);
54	acl_get_brand_np(*prev_acl, &prev_acl_brand);
55
56	if (branding_mismatch(acl_brand, prev_acl_brand)) {
57		warnx("%s: branding mismatch; existing ACL is %s, "
58		    "entry to be removed is %s", filename,
59		    brand_name(prev_acl_brand), brand_name(acl_brand));
60		return (-1);
61	}
62
63	carried_error = 0;
64
65	acl_new = acl_dup(*prev_acl);
66	if (acl_new == NULL)
67		err(1, "%s: acl_dup() failed", filename);
68
69	tag = ACL_UNDEFINED_TAG;
70
71	/* find and delete the entry */
72	entry_id = ACL_FIRST_ENTRY;
73	while (acl_get_entry(acl, entry_id, &entry) == 1) {
74		entry_id = ACL_NEXT_ENTRY;
75		if (acl_get_tag_type(entry, &tag) == -1)
76			err(1, "%s: acl_get_tag_type() failed", filename);
77		if (tag == ACL_MASK)
78			have_mask++;
79		if (acl_delete_entry(acl_new, entry) == -1) {
80			carried_error++;
81			warnx("%s: cannot remove non-existent ACL entry",
82			    filename);
83		}
84	}
85
86	acl_free(*prev_acl);
87	*prev_acl = acl_new;
88
89	if (carried_error)
90		return (-1);
91
92	return (0);
93}
94
95int
96remove_by_number(uint entry_number, acl_t *prev_acl, const char *filename)
97{
98	acl_entry_t	entry;
99	acl_t		acl_new;
100	acl_tag_t	tag;
101	int		carried_error, entry_id;
102	uint		i;
103
104	carried_error = 0;
105
106	acl_new = acl_dup(*prev_acl);
107	if (acl_new == NULL)
108		err(1, "%s: acl_dup() failed", filename);
109
110	tag = ACL_UNDEFINED_TAG;
111
112	/*
113	 * Find out whether we're removing the mask entry,
114	 * to behave the same as the routine above.
115	 *
116	 * XXX: Is this loop actually needed?
117	 */
118	entry_id = ACL_FIRST_ENTRY;
119	i = 0;
120	while (acl_get_entry(acl_new, entry_id, &entry) == 1) {
121		entry_id = ACL_NEXT_ENTRY;
122		if (i != entry_number)
123			continue;
124		if (acl_get_tag_type(entry, &tag) == -1)
125			err(1, "%s: acl_get_tag_type() failed", filename);
126		if (tag == ACL_MASK)
127			have_mask++;
128	}
129
130	if (acl_delete_entry_np(acl_new, entry_number) == -1) {
131		carried_error++;
132		warn("%s: acl_delete_entry_np() failed", filename);
133	}
134
135	acl_free(*prev_acl);
136	*prev_acl = acl_new;
137
138	if (carried_error)
139		return (-1);
140
141	return (0);
142}
143
144/*
145 * remove default entries
146 */
147int
148remove_default(acl_t *prev_acl, const char *filename)
149{
150
151	acl_free(*prev_acl);
152	*prev_acl = acl_init(ACL_MAX_ENTRIES);
153	if (*prev_acl == NULL)
154		err(1, "%s: acl_init() failed", filename);
155
156	return (0);
157}
158
159/*
160 * remove extended entries
161 */
162void
163remove_ext(acl_t *prev_acl, const char *filename)
164{
165	acl_t acl_new;
166
167	acl_new = acl_strip_np(*prev_acl, !n_flag);
168	if (acl_new == NULL)
169		err(1, "%s: acl_strip_np() failed", filename);
170
171	acl_free(*prev_acl);
172	*prev_acl = acl_new;
173}
174