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 196936 2009-09-07 16:19:32Z trasz $");
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 (acl_brand != prev_acl_brand) {
57 warnx("%s: branding mismatch; existing ACL is %s, "
58 "entry to be removed is %s", filename,
59 prev_acl_brand == ACL_BRAND_NFS4 ? "NFSv4" : "POSIX.1e",
60 acl_brand == ACL_BRAND_NFS4 ? "NFSv4" : "POSIX.1e");
61 return (-1);
62 }
63
64 carried_error = 0;
65
66 acl_new = acl_dup(*prev_acl);
67 if (acl_new == NULL)
68 err(1, "%s: acl_dup() failed", filename);
69
70 tag = ACL_UNDEFINED_TAG;
71
72 /* find and delete the entry */
73 entry_id = ACL_FIRST_ENTRY;
74 while (acl_get_entry(acl, entry_id, &entry) == 1) {
75 entry_id = ACL_NEXT_ENTRY;
76 if (acl_get_tag_type(entry, &tag) == -1)
77 err(1, "%s: acl_get_tag_type() failed", filename);
78 if (tag == ACL_MASK)
79 have_mask++;
80 if (acl_delete_entry(acl_new, entry) == -1) {
81 carried_error++;
82 warnx("%s: cannot remove non-existent ACL entry",
83 filename);
84 }
85 }
86
87 acl_free(*prev_acl);
88 *prev_acl = acl_new;
89
90 if (carried_error)
91 return (-1);
92
93 return (0);
94}
95
96int
97remove_by_number(uint entry_number, acl_t *prev_acl, const char *filename)
98{
99 acl_entry_t entry;
100 acl_t acl_new;
101 acl_tag_t tag;
102 int carried_error, entry_id;
103 uint i;
104
105 carried_error = 0;
106
107 acl_new = acl_dup(*prev_acl);
108 if (acl_new == NULL)
109 err(1, "%s: acl_dup() failed", filename);
110
111 tag = ACL_UNDEFINED_TAG;
112
113 /*
114 * Find out whether we're removing the mask entry,
115 * to behave the same as the routine above.
116 *
117 * XXX: Is this loop actually needed?
118 */
119 entry_id = ACL_FIRST_ENTRY;
120 i = 0;
121 while (acl_get_entry(acl_new, entry_id, &entry) == 1) {
122 entry_id = ACL_NEXT_ENTRY;
123 if (i != entry_number)
124 continue;
125 if (acl_get_tag_type(entry, &tag) == -1)
126 err(1, "%s: acl_get_tag_type() failed", filename);
127 if (tag == ACL_MASK)
128 have_mask++;
129 }
130
131 if (acl_delete_entry_np(acl_new, entry_number) == -1) {
132 carried_error++;
133 warn("%s: acl_delete_entry_np() failed", filename);
134 }
135
136 acl_free(*prev_acl);
137 *prev_acl = acl_new;
138
139 if (carried_error)
140 return (-1);
141
142 return (0);
143}
144
145/*
146 * remove default entries
147 */
148int
149remove_default(acl_t *prev_acl, const char *filename)
150{
151
152 acl_free(*prev_acl);
153 *prev_acl = acl_init(ACL_MAX_ENTRIES);
154 if (*prev_acl == NULL)
155 err(1, "%s: acl_init() failed", filename);
156
157 return (0);
158}
159
160/*
161 * remove extended entries
162 */
163void
164remove_ext(acl_t *prev_acl, const char *filename)
165{
166 acl_t acl_new;
167
168 acl_new = acl_strip_np(*prev_acl, !n_flag);
169 if (acl_new == NULL)
170 err(1, "%s: acl_strip_np() failed", filename);
171
172 acl_free(*prev_acl);
173 *prev_acl = acl_new;
174}