1 /* $NetBSD: mask.c,v 1.1 2020/05/16 18:31:45 christos Exp $ */
2
3 /*-
4 * Copyright (c) 2001-2002 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/mask.c 333065 2018-04-27 15:25:24Z emaste $");
32 #else
33 __RCSID("$NetBSD: mask.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 <errno.h>
42 #include <stdio.h>
43 #include <stdlib.h>
44
45 #include "setfacl.h"
46
47 /* set the appropriate mask the given ACL's */
48 int
set_acl_mask(acl_t * prev_acl,const char * filename)49 set_acl_mask(acl_t *prev_acl, const char *filename)
50 {
51 acl_entry_t entry;
52 acl_t acl;
53 acl_tag_t tag;
54 int entry_id;
55
56 entry = NULL;
57
58 /*
59 * ... if a mask entry is specified, then the permissions of the mask
60 * entry in the resulting ACL shall be set to the permissions in the
61 * specified ACL mask entry.
62 */
63 if (have_mask)
64 return (0);
65
66 acl = acl_dup(*prev_acl);
67 if (acl == NULL)
68 err(1, "%s: acl_dup() failed", filename);
69
70 if (!n_flag) {
71 /*
72 * If no mask entry is specified and the -n option is not
73 * specified, then the permissions of the resulting ACL mask
74 * entry shall be set to the union of the permissions
75 * associated with all entries which belong to the file group
76 * class in the resulting ACL
77 */
78 if (acl_calc_mask(&acl)) {
79 warn("%s: acl_calc_mask() failed", filename);
80 acl_free(acl);
81 return (-1);
82 }
83 } else {
84 /*
85 * If no mask entry is specified and the -n option is
86 * specified, then the permissions of the resulting ACL
87 * mask entry shall remain unchanged ...
88 */
89
90 entry_id = ACL_FIRST_ENTRY;
91
92 while (acl_get_entry(acl, entry_id, &entry) == 1) {
93 entry_id = ACL_NEXT_ENTRY;
94 if (acl_get_tag_type(entry, &tag) == -1)
95 err(1, "%s: acl_get_tag_type() failed",
96 filename);
97
98 if (tag == ACL_MASK) {
99 acl_free(acl);
100 return (0);
101 }
102 }
103
104 /*
105 * If no mask entry is specified, the -n option is specified,
106 * and no ACL mask entry exists in the ACL associated with the
107 * file, then write an error message to standard error and
108 * continue with the next file.
109 */
110 warnx("%s: warning: no mask entry", filename);
111 acl_free(acl);
112 return (0);
113 }
114
115 acl_free(*prev_acl);
116 *prev_acl = acl_dup(acl);
117 acl_free(acl);
118
119 return (0);
120 }
121