remove.c revision 75928 
1/*
2 * Copyright (c) 2001 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 THE VOICES IN HIS HEAD BE
18 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
19 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
20 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
21 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
22 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
23 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
24 * POSSIBILITY OF SUCH DAMAGE.
25 *
26 * $FreeBSD: head/bin/setfacl/remove.c 75928 2001-04-24 22:45:41Z jedgar $
27 */
28
29#include <sys/types.h>
30#include <sys/acl.h>
31#include <sys/stat.h>
32
33#include <err.h>
34#include <stdio.h>
35#include <string.h>
36#include <sysexits.h>
37
38#include "setfacl.h"
39
40/* remove ACL entries from an ACL */
41int
42remove_acl(acl_t acl, acl_t *prev_acl)
43{
44	acl_entry_t	entry;
45	acl_t		acl_new;
46	acl_tag_t	tag;
47	int		carried_error, entry_id;
48
49	carried_error = 0;
50
51	if (acl_type == ACL_TYPE_ACCESS)
52		acl_new = acl_dup(prev_acl[0]);
53	else
54		acl_new = acl_dup(prev_acl[1]);
55	if (!acl_new)
56		err(EX_OSERR, "acl_dup() failed");
57
58	tag = ACL_UNDEFINED_TAG;
59
60	/* find and delete the entry */
61	entry_id = ACL_FIRST_ENTRY;
62	while (acl_get_entry(acl, entry_id, &entry) == 1) {
63		entry_id = ACL_NEXT_ENTRY;
64		if (acl_get_tag_type(entry, &tag) == -1)
65			err(1, "acl_get_tag_type() failed");
66		if (tag == ACL_MASK)
67			have_mask++;
68		if (acl_delete_entry(acl_new, entry) == -1) {
69			carried_error++;
70			warnx("cannot remove non-existent acl entry");
71		}
72	}
73
74	if (acl_type == ACL_TYPE_ACCESS) {
75		acl_free(prev_acl[0]);
76		prev_acl[0] = acl_new;
77	} else {
78		acl_free(prev_acl[1]);
79		prev_acl[1] = acl_new;
80	}
81
82	if (carried_error)
83		return -1;
84
85	return 0;
86}
87
88/* remove default entries */
89int
90remove_default(acl_t *prev_acl)
91{
92
93	if (prev_acl[1]) {
94		acl_free(prev_acl[1]);
95		prev_acl[1] = acl_init(ACL_MAX_ENTRIES);
96		if (!prev_acl[1])
97			err(1, "acl_init() failed");
98	} else {
99		warn("cannot remove default ACL");
100		return -1;
101	}
102	return 0;
103}
104
105/* remove extended entries */
106void
107remove_ext(acl_t *prev_acl)
108{
109	acl_t acl_new, acl_old;
110	acl_entry_t entry, entry_new;
111	acl_permset_t perm;
112	acl_tag_t tag;
113	int entry_id, have_mask_entry;
114
115	if (acl_type == ACL_TYPE_ACCESS)
116		acl_old = acl_dup(prev_acl[0]);
117	else
118		acl_old = acl_dup(prev_acl[1]);
119	if (!acl_old)
120		err(EX_OSERR, "acl_dup() failed");
121
122	have_mask_entry = 0;
123	acl_new = acl_init(ACL_MAX_ENTRIES);
124	if (!acl_new)
125		err(EX_OSERR, "%s", "acl_init() failed");
126	tag = ACL_UNDEFINED_TAG;
127
128	/* only save the default user/group/other entries */
129	entry_id = ACL_FIRST_ENTRY;
130	while (acl_get_entry(acl_old, entry_id, &entry) == 1) {
131		entry_id = ACL_NEXT_ENTRY;
132
133		if (acl_get_tag_type(entry, &tag) == -1)
134			err(1, "acl_get_tag_type() failed");
135
136		switch(tag) {
137		case ACL_USER_OBJ:
138		case ACL_GROUP_OBJ:
139		case ACL_OTHER:
140			if (acl_get_tag_type(entry, &tag) == -1)
141				err(1, "acl_get_tag_type() failed");
142			if (acl_get_permset(entry, &perm) == -1)
143				err(1, "acl_get_permset() failed");
144			if (acl_create_entry(&acl_new, &entry_new) == -1)
145				err(1, "acl_create_entry() failed");
146			if (acl_set_tag_type(entry_new, tag) == -1)
147				err(1, "acl_set_tag_type() failed");
148			if (acl_set_permset(entry_new, perm) == -1)
149				err(1, "acl_get_permset() failed");
150			if (acl_copy_entry(entry_new, entry) == -1)
151				err(1, "acl_copy_entry() failed");
152			break;
153		case ACL_MASK:
154			have_mask_entry = 1;
155			break;
156		default:
157			break;
158		}
159	}
160	if (have_mask_entry && !n_flag) {
161		if (acl_calc_mask(&acl_new) == -1)
162			err(1, "acl_calc_mask() failed");
163	} else {
164		have_mask = 1;
165	}
166
167	if (acl_type == ACL_TYPE_ACCESS) {
168		acl_free(prev_acl[0]);
169		prev_acl[0] = acl_new;
170	} else {
171		acl_free(prev_acl[1]);
172		prev_acl[1] = acl_new;
173	}
174}
175