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/types.h>
28#include <sys/acl.h>
29#include <sys/stat.h>
30
31#include <err.h>
32
33#include "setfacl.h"
34
35/*
36 * remove ACL entries from an ACL
37 */
38int
39remove_acl(acl_t acl, acl_t *prev_acl, const char *filename)
40{
41	acl_entry_t	entry;
42	acl_t		acl_new;
43	acl_tag_t	tag;
44	int		carried_error, entry_id, acl_brand, prev_acl_brand;
45
46	carried_error = 0;
47
48	acl_get_brand_np(acl, &acl_brand);
49	acl_get_brand_np(*prev_acl, &prev_acl_brand);
50
51	if (branding_mismatch(acl_brand, prev_acl_brand)) {
52		warnx("%s: branding mismatch; existing ACL is %s, "
53		    "entry to be removed is %s", filename,
54		    brand_name(prev_acl_brand), brand_name(acl_brand));
55		return (-1);
56	}
57
58	carried_error = 0;
59
60	acl_new = acl_dup(*prev_acl);
61	if (acl_new == NULL)
62		err(1, "%s: acl_dup() failed", filename);
63
64	tag = ACL_UNDEFINED_TAG;
65
66	/* find and delete the entry */
67	entry_id = ACL_FIRST_ENTRY;
68	while (acl_get_entry(acl, entry_id, &entry) == 1) {
69		entry_id = ACL_NEXT_ENTRY;
70		if (acl_get_tag_type(entry, &tag) == -1)
71			err(1, "%s: acl_get_tag_type() failed", filename);
72		if (tag == ACL_MASK)
73			have_mask = true;
74		if (acl_delete_entry(acl_new, entry) == -1) {
75			carried_error++;
76			warnx("%s: cannot remove non-existent ACL entry",
77			    filename);
78		}
79	}
80
81	acl_free(*prev_acl);
82	*prev_acl = acl_new;
83
84	if (carried_error)
85		return (-1);
86
87	return (0);
88}
89
90int
91remove_by_number(uint entry_number, acl_t *prev_acl, const char *filename)
92{
93	acl_entry_t	entry;
94	acl_t		acl_new;
95	acl_tag_t	tag;
96	int		carried_error, entry_id;
97	uint		i;
98
99	carried_error = 0;
100
101	acl_new = acl_dup(*prev_acl);
102	if (acl_new == NULL)
103		err(1, "%s: acl_dup() failed", filename);
104
105	tag = ACL_UNDEFINED_TAG;
106
107	/*
108	 * Find out whether we're removing the mask entry,
109	 * to behave the same as the routine above.
110	 *
111	 * XXX: Is this loop actually needed?
112	 */
113	entry_id = ACL_FIRST_ENTRY;
114	i = 0;
115	while (acl_get_entry(acl_new, entry_id, &entry) == 1) {
116		entry_id = ACL_NEXT_ENTRY;
117		if (i != entry_number)
118			continue;
119		if (acl_get_tag_type(entry, &tag) == -1)
120			err(1, "%s: acl_get_tag_type() failed", filename);
121		if (tag == ACL_MASK)
122			have_mask = true;
123	}
124
125	if (acl_delete_entry_np(acl_new, entry_number) == -1) {
126		carried_error++;
127		warn("%s: acl_delete_entry_np() failed", filename);
128	}
129
130	acl_free(*prev_acl);
131	*prev_acl = acl_new;
132
133	if (carried_error)
134		return (-1);
135
136	return (0);
137}
138
139/*
140 * remove default entries
141 */
142int
143remove_default(acl_t *prev_acl, const char *filename)
144{
145
146	acl_free(*prev_acl);
147	*prev_acl = acl_init(ACL_MAX_ENTRIES);
148	if (*prev_acl == NULL)
149		err(1, "%s: acl_init() failed", filename);
150
151	return (0);
152}
153
154/*
155 * remove extended entries
156 */
157void
158remove_ext(acl_t *prev_acl, const char *filename)
159{
160	acl_t acl_new;
161
162	acl_new = acl_strip_np(*prev_acl, !n_flag);
163	if (acl_new == NULL)
164		err(1, "%s: acl_strip_np() failed", filename);
165
166	acl_free(*prev_acl);
167	*prev_acl = acl_new;
168}
169