1 /*-
2 * Copyright (c) 2001-2002 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 <errno.h>
36 #include <stdio.h>
37 #include <stdlib.h>
38
39 #include "setfacl.h"
40
41 /* set the appropriate mask the given ACL's */
42 int
set_acl_mask(acl_t * prev_acl,const char * filename)43 set_acl_mask(acl_t *prev_acl, const char *filename)
44 {
45 acl_entry_t entry;
46 acl_t acl;
47 acl_tag_t tag;
48 int entry_id;
49
50 entry = NULL;
51
52 /*
53 * ... if a mask entry is specified, then the permissions of the mask
54 * entry in the resulting ACL shall be set to the permissions in the
55 * specified ACL mask entry.
56 */
57 if (have_mask)
58 return (0);
59
60 acl = acl_dup(*prev_acl);
61 if (acl == NULL)
62 err(1, "%s: acl_dup() failed", filename);
63
64 if (n_flag == 0) {
65 /*
66 * If no mask entry is specified and the -n option is not
67 * specified, then the permissions of the resulting ACL mask
68 * entry shall be set to the union of the permissions
69 * associated with all entries which belong to the file group
70 * class in the resulting ACL
71 */
72 if (acl_calc_mask(&acl)) {
73 warn("%s: acl_calc_mask() failed", filename);
74 acl_free(acl);
75 return (-1);
76 }
77 } else {
78 /*
79 * If no mask entry is specified and the -n option is
80 * specified, then the permissions of the resulting ACL
81 * mask entry shall remain unchanged ...
82 */
83
84 entry_id = ACL_FIRST_ENTRY;
85
86 while (acl_get_entry(acl, entry_id, &entry) == 1) {
87 entry_id = ACL_NEXT_ENTRY;
88 if (acl_get_tag_type(entry, &tag) == -1)
89 err(1, "%s: acl_get_tag_type() failed",
90 filename);
91
92 if (tag == ACL_MASK) {
93 acl_free(acl);
94 return (0);
95 }
96 }
97
98 /*
99 * If no mask entry is specified, the -n option is specified,
100 * and no ACL mask entry exists in the ACL associated with the
101 * file, then write an error message to standard error and
102 * continue with the next file.
103 */
104 warnx("%s: warning: no mask entry", filename);
105 acl_free(acl);
106 return (0);
107 }
108
109 acl_free(*prev_acl);
110 *prev_acl = acl_dup(acl);
111 acl_free(acl);
112
113 return (0);
114 }
115