1 /* $NetBSD: remove.c,v 1.1 2020/05/16 18:31:45 christos Exp $ */
2
3 /*-
4 * Copyright (c) 2001 Chris D. Faulhaber
5 * All rights reserved.
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 #include <sys/cdefs.h>
30 #if 0
31 __FBSDID("$FreeBSD: head/bin/setfacl/remove.c 333065 2018-04-27 15:25:24Z emaste $");
32 #else
33 __RCSID("$NetBSD: remove.c,v 1.1 2020/05/16 18:31:45 christos Exp $");
34 #endif
35
36 #include <sys/types.h>
37 #include <sys/acl.h>
38 #include <sys/stat.h>
39
40 #include <err.h>
41 #include <stdio.h>
42 #include <string.h>
43
44 #include "setfacl.h"
45
46 /*
47 * remove ACL entries from an ACL
48 */
49 int
remove_acl(acl_t acl,acl_t * prev_acl,const char * filename)50 remove_acl(acl_t acl, acl_t *prev_acl, const char *filename)
51 {
52 acl_entry_t entry;
53 acl_t acl_new;
54 acl_tag_t tag;
55 int carried_error, entry_id, acl_brand, prev_acl_brand;
56
57 carried_error = 0;
58
59 acl_get_brand_np(acl, &acl_brand);
60 acl_get_brand_np(*prev_acl, &prev_acl_brand);
61
62 if (branding_mismatch(acl_brand, prev_acl_brand)) {
63 warnx("%s: branding mismatch; existing ACL is %s, "
64 "entry to be removed is %s", filename,
65 brand_name(prev_acl_brand), brand_name(acl_brand));
66 return (-1);
67 }
68
69 carried_error = 0;
70
71 acl_new = acl_dup(*prev_acl);
72 if (acl_new == NULL)
73 err(1, "%s: acl_dup() failed", filename);
74
75 tag = ACL_UNDEFINED_TAG;
76
77 /* find and delete the entry */
78 entry_id = ACL_FIRST_ENTRY;
79 while (acl_get_entry(acl, entry_id, &entry) == 1) {
80 entry_id = ACL_NEXT_ENTRY;
81 if (acl_get_tag_type(entry, &tag) == -1)
82 err(1, "%s: acl_get_tag_type() failed", filename);
83 if (tag == ACL_MASK)
84 have_mask = true;
85 if (acl_delete_entry(acl_new, entry) == -1) {
86 carried_error++;
87 warnx("%s: cannot remove non-existent ACL entry",
88 filename);
89 }
90 }
91
92 acl_free(*prev_acl);
93 *prev_acl = acl_new;
94
95 if (carried_error)
96 return (-1);
97
98 return (0);
99 }
100
101 int
remove_by_number(uint entry_number,acl_t * prev_acl,const char * filename)102 remove_by_number(uint entry_number, acl_t *prev_acl, const char *filename)
103 {
104 acl_entry_t entry;
105 acl_t acl_new;
106 acl_tag_t tag;
107 int carried_error, entry_id;
108 uint i;
109
110 carried_error = 0;
111
112 acl_new = acl_dup(*prev_acl);
113 if (acl_new == NULL)
114 err(1, "%s: acl_dup() failed", filename);
115
116 tag = ACL_UNDEFINED_TAG;
117
118 /*
119 * Find out whether we're removing the mask entry,
120 * to behave the same as the routine above.
121 *
122 * XXX: Is this loop actually needed?
123 */
124 entry_id = ACL_FIRST_ENTRY;
125 i = 0;
126 while (acl_get_entry(acl_new, entry_id, &entry) == 1) {
127 entry_id = ACL_NEXT_ENTRY;
128 if (i != entry_number)
129 continue;
130 if (acl_get_tag_type(entry, &tag) == -1)
131 err(1, "%s: acl_get_tag_type() failed", filename);
132 if (tag == ACL_MASK)
133 have_mask = true;
134 }
135
136 if (acl_delete_entry_np(acl_new, entry_number) == -1) {
137 carried_error++;
138 warn("%s: acl_delete_entry_np() failed", filename);
139 }
140
141 acl_free(*prev_acl);
142 *prev_acl = acl_new;
143
144 if (carried_error)
145 return (-1);
146
147 return (0);
148 }
149
150 /*
151 * remove default entries
152 */
153 int
remove_default(acl_t * prev_acl,const char * filename)154 remove_default(acl_t *prev_acl, const char *filename)
155 {
156
157 acl_free(*prev_acl);
158 *prev_acl = acl_init(ACL_MAX_ENTRIES);
159 if (*prev_acl == NULL)
160 err(1, "%s: acl_init() failed", filename);
161
162 return (0);
163 }
164
165 /*
166 * remove extended entries
167 */
168 void
remove_ext(acl_t * prev_acl,const char * filename)169 remove_ext(acl_t *prev_acl, const char *filename)
170 {
171 acl_t acl_new;
172
173 acl_new = acl_strip_np(*prev_acl, !n_flag);
174 if (acl_new == NULL)
175 err(1, "%s: acl_strip_np() failed", filename);
176
177 acl_free(*prev_acl);
178 *prev_acl = acl_new;
179 }
180