xref: /netbsd-src/bin/setfacl/mask.c (revision 9aa2a9c323eb12a08584c70d6ea91d316703d3fe)
1*9aa2a9c3Schristos /*	$NetBSD: mask.c,v 1.1 2020/05/16 18:31:45 christos Exp $	*/
2*9aa2a9c3Schristos 
3*9aa2a9c3Schristos /*-
4*9aa2a9c3Schristos  * Copyright (c) 2001-2002 Chris D. Faulhaber
5*9aa2a9c3Schristos  * All rights reserved.
6*9aa2a9c3Schristos  *
7*9aa2a9c3Schristos  * Redistribution and use in source and binary forms, with or without
8*9aa2a9c3Schristos  * modification, are permitted provided that the following conditions
9*9aa2a9c3Schristos  * are met:
10*9aa2a9c3Schristos  * 1. Redistributions of source code must retain the above copyright
11*9aa2a9c3Schristos  *    notice, this list of conditions and the following disclaimer.
12*9aa2a9c3Schristos  * 2. Redistributions in binary form must reproduce the above copyright
13*9aa2a9c3Schristos  *    notice, this list of conditions and the following disclaimer in the
14*9aa2a9c3Schristos  *    documentation and/or other materials provided with the distribution.
15*9aa2a9c3Schristos  *
16*9aa2a9c3Schristos  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17*9aa2a9c3Schristos  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18*9aa2a9c3Schristos  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19*9aa2a9c3Schristos  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20*9aa2a9c3Schristos  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21*9aa2a9c3Schristos  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22*9aa2a9c3Schristos  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23*9aa2a9c3Schristos  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24*9aa2a9c3Schristos  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25*9aa2a9c3Schristos  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26*9aa2a9c3Schristos  * SUCH DAMAGE.
27*9aa2a9c3Schristos  */
28*9aa2a9c3Schristos 
29*9aa2a9c3Schristos #include <sys/cdefs.h>
30*9aa2a9c3Schristos #if 0
31*9aa2a9c3Schristos __FBSDID("$FreeBSD: head/bin/setfacl/mask.c 333065 2018-04-27 15:25:24Z emaste $");
32*9aa2a9c3Schristos #else
33*9aa2a9c3Schristos __RCSID("$NetBSD: mask.c,v 1.1 2020/05/16 18:31:45 christos Exp $");
34*9aa2a9c3Schristos #endif
35*9aa2a9c3Schristos 
36*9aa2a9c3Schristos #include <sys/types.h>
37*9aa2a9c3Schristos #include <sys/acl.h>
38*9aa2a9c3Schristos #include <sys/stat.h>
39*9aa2a9c3Schristos 
40*9aa2a9c3Schristos #include <err.h>
41*9aa2a9c3Schristos #include <errno.h>
42*9aa2a9c3Schristos #include <stdio.h>
43*9aa2a9c3Schristos #include <stdlib.h>
44*9aa2a9c3Schristos 
45*9aa2a9c3Schristos #include "setfacl.h"
46*9aa2a9c3Schristos 
47*9aa2a9c3Schristos /* set the appropriate mask the given ACL's */
48*9aa2a9c3Schristos int
set_acl_mask(acl_t * prev_acl,const char * filename)49*9aa2a9c3Schristos set_acl_mask(acl_t *prev_acl, const char *filename)
50*9aa2a9c3Schristos {
51*9aa2a9c3Schristos 	acl_entry_t entry;
52*9aa2a9c3Schristos 	acl_t acl;
53*9aa2a9c3Schristos 	acl_tag_t tag;
54*9aa2a9c3Schristos 	int entry_id;
55*9aa2a9c3Schristos 
56*9aa2a9c3Schristos 	entry = NULL;
57*9aa2a9c3Schristos 
58*9aa2a9c3Schristos 	/*
59*9aa2a9c3Schristos 	 * ... if a mask entry is specified, then the permissions of the mask
60*9aa2a9c3Schristos 	 * entry in the resulting ACL shall be set to the permissions in the
61*9aa2a9c3Schristos 	 * specified ACL mask entry.
62*9aa2a9c3Schristos 	 */
63*9aa2a9c3Schristos 	if (have_mask)
64*9aa2a9c3Schristos 		return (0);
65*9aa2a9c3Schristos 
66*9aa2a9c3Schristos 	acl = acl_dup(*prev_acl);
67*9aa2a9c3Schristos 	if (acl == NULL)
68*9aa2a9c3Schristos 		err(1, "%s: acl_dup() failed", filename);
69*9aa2a9c3Schristos 
70*9aa2a9c3Schristos 	if (!n_flag) {
71*9aa2a9c3Schristos 		/*
72*9aa2a9c3Schristos 		 * If no mask entry is specified and the -n option is not
73*9aa2a9c3Schristos 		 * specified, then the permissions of the resulting ACL mask
74*9aa2a9c3Schristos 		 * entry shall be set to the union of the permissions
75*9aa2a9c3Schristos 		 * associated with all entries which belong to the file group
76*9aa2a9c3Schristos 		 * class in the resulting ACL
77*9aa2a9c3Schristos 		 */
78*9aa2a9c3Schristos 		if (acl_calc_mask(&acl)) {
79*9aa2a9c3Schristos 			warn("%s: acl_calc_mask() failed", filename);
80*9aa2a9c3Schristos 			acl_free(acl);
81*9aa2a9c3Schristos 			return (-1);
82*9aa2a9c3Schristos 		}
83*9aa2a9c3Schristos 	} else {
84*9aa2a9c3Schristos 		/*
85*9aa2a9c3Schristos 		 * If no mask entry is specified and the -n option is
86*9aa2a9c3Schristos 		 * specified, then the permissions of the resulting ACL
87*9aa2a9c3Schristos 		 * mask entry shall remain unchanged ...
88*9aa2a9c3Schristos 		 */
89*9aa2a9c3Schristos 
90*9aa2a9c3Schristos 		entry_id = ACL_FIRST_ENTRY;
91*9aa2a9c3Schristos 
92*9aa2a9c3Schristos 		while (acl_get_entry(acl, entry_id, &entry) == 1) {
93*9aa2a9c3Schristos 			entry_id = ACL_NEXT_ENTRY;
94*9aa2a9c3Schristos 			if (acl_get_tag_type(entry, &tag) == -1)
95*9aa2a9c3Schristos 				err(1, "%s: acl_get_tag_type() failed",
96*9aa2a9c3Schristos 				    filename);
97*9aa2a9c3Schristos 
98*9aa2a9c3Schristos 			if (tag == ACL_MASK) {
99*9aa2a9c3Schristos 				acl_free(acl);
100*9aa2a9c3Schristos 				return (0);
101*9aa2a9c3Schristos 			}
102*9aa2a9c3Schristos 		}
103*9aa2a9c3Schristos 
104*9aa2a9c3Schristos 		/*
105*9aa2a9c3Schristos 		 * If no mask entry is specified, the -n option is specified,
106*9aa2a9c3Schristos 		 * and no ACL mask entry exists in the ACL associated with the
107*9aa2a9c3Schristos 		 * file, then write an error message to standard error and
108*9aa2a9c3Schristos 		 * continue with the next file.
109*9aa2a9c3Schristos 		 */
110*9aa2a9c3Schristos 		warnx("%s: warning: no mask entry", filename);
111*9aa2a9c3Schristos 		acl_free(acl);
112*9aa2a9c3Schristos 		return (0);
113*9aa2a9c3Schristos 	}
114*9aa2a9c3Schristos 
115*9aa2a9c3Schristos 	acl_free(*prev_acl);
116*9aa2a9c3Schristos 	*prev_acl = acl_dup(acl);
117*9aa2a9c3Schristos 	acl_free(acl);
118*9aa2a9c3Schristos 
119*9aa2a9c3Schristos 	return (0);
120*9aa2a9c3Schristos }
121