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/types.h>
28 #include <sys/acl.h>
29 #include <sys/stat.h>
30
31 #include <err.h>
32
33 #include "setfacl.h"
34
35 /* set the appropriate mask the given ACL's */
36 int
set_acl_mask(acl_t * prev_acl,const char * filename)37 set_acl_mask(acl_t *prev_acl, const char *filename)
38 {
39 acl_entry_t entry;
40 acl_t acl;
41 acl_tag_t tag;
42 int entry_id;
43
44 entry = NULL;
45
46 /*
47 * ... if a mask entry is specified, then the permissions of the mask
48 * entry in the resulting ACL shall be set to the permissions in the
49 * specified ACL mask entry.
50 */
51 if (have_mask)
52 return (0);
53
54 acl = acl_dup(*prev_acl);
55 if (acl == NULL)
56 err(1, "%s: acl_dup() failed", filename);
57
58 if (!n_flag) {
59 /*
60 * If no mask entry is specified and the -n option is not
61 * specified, then the permissions of the resulting ACL mask
62 * entry shall be set to the union of the permissions
63 * associated with all entries which belong to the file group
64 * class in the resulting ACL
65 */
66 if (acl_calc_mask(&acl)) {
67 warn("%s: acl_calc_mask() failed", filename);
68 acl_free(acl);
69 return (-1);
70 }
71 } else {
72 /*
73 * If no mask entry is specified and the -n option is
74 * specified, then the permissions of the resulting ACL
75 * mask entry shall remain unchanged ...
76 */
77
78 entry_id = ACL_FIRST_ENTRY;
79
80 while (acl_get_entry(acl, entry_id, &entry) == 1) {
81 entry_id = ACL_NEXT_ENTRY;
82 if (acl_get_tag_type(entry, &tag) == -1)
83 err(1, "%s: acl_get_tag_type() failed",
84 filename);
85
86 if (tag == ACL_MASK) {
87 acl_free(acl);
88 return (0);
89 }
90 }
91
92 /*
93 * If no mask entry is specified, the -n option is specified,
94 * and no ACL mask entry exists in the ACL associated with the
95 * file, then write an error message to standard error and
96 * continue with the next file.
97 */
98 warnx("%s: warning: no mask entry", filename);
99 acl_free(acl);
100 return (0);
101 }
102
103 acl_free(*prev_acl);
104 *prev_acl = acl_dup(acl);
105 acl_free(acl);
106
107 return (0);
108 }
109