remove.c revision 87254 
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 87254 2001-12-03 00:51:36Z 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
37#include "setfacl.h"
38
39/*
40 * remove ACL entries from an ACL
41 */
42int
43remove_acl(acl_t acl, acl_t *prev_acl)
44{
45	acl_entry_t	entry;
46	acl_t		acl_new;
47	acl_tag_t	tag;
48	int		carried_error, entry_id;
49
50	carried_error = 0;
51
52	if (acl_type == ACL_TYPE_ACCESS)
53		acl_new = acl_dup(prev_acl[0]);
54	else
55		acl_new = acl_dup(prev_acl[1]);
56	if (acl_new == NULL)
57		err(1, "acl_dup() failed");
58
59	tag = ACL_UNDEFINED_TAG;
60
61	/* find and delete the entry */
62	entry_id = ACL_FIRST_ENTRY;
63	while (acl_get_entry(acl, entry_id, &entry) == 1) {
64		entry_id = ACL_NEXT_ENTRY;
65		if (acl_get_tag_type(entry, &tag) == -1)
66			err(1, "acl_get_tag_type() failed");
67		if (tag == ACL_MASK)
68			have_mask++;
69		if (acl_delete_entry(acl_new, entry) == -1) {
70			carried_error++;
71			warnx("cannot remove non-existent acl entry");
72		}
73	}
74
75	if (acl_type == ACL_TYPE_ACCESS) {
76		acl_free(prev_acl[0]);
77		prev_acl[0] = acl_new;
78	} else {
79		acl_free(prev_acl[1]);
80		prev_acl[1] = acl_new;
81	}
82
83	if (carried_error)
84		return (-1);
85
86	return (0);
87}
88
89/*
90 * remove default entries
91 */
92int
93remove_default(acl_t *prev_acl)
94{
95
96	if (prev_acl[1]) {
97		acl_free(prev_acl[1]);
98		prev_acl[1] = acl_init(ACL_MAX_ENTRIES);
99		if (prev_acl[1] == NULL)
100			err(1, "acl_init() failed");
101	} else {
102		warn("cannot remove default ACL");
103		return (-1);
104	}
105	return (0);
106}
107
108/*
109 * remove extended entries
110 */
111void
112remove_ext(acl_t *prev_acl)
113{
114	acl_t acl_new, acl_old;
115	acl_entry_t entry, entry_new;
116	acl_permset_t perm;
117	acl_tag_t tag;
118	int entry_id, have_mask_entry;
119
120	if (acl_type == ACL_TYPE_ACCESS)
121		acl_old = acl_dup(prev_acl[0]);
122	else
123		acl_old = acl_dup(prev_acl[1]);
124	if (acl_old == NULL)
125		err(1, "acl_dup() failed");
126
127	have_mask_entry = 0;
128	acl_new = acl_init(ACL_MAX_ENTRIES);
129	if (acl_new == NULL)
130		err(1, "acl_init() failed");
131	tag = ACL_UNDEFINED_TAG;
132
133	/* only save the default user/group/other entries */
134	entry_id = ACL_FIRST_ENTRY;
135	while (acl_get_entry(acl_old, entry_id, &entry) == 1) {
136		entry_id = ACL_NEXT_ENTRY;
137
138		if (acl_get_tag_type(entry, &tag) == -1)
139			err(1, "acl_get_tag_type() failed");
140
141		switch(tag) {
142		case ACL_USER_OBJ:
143		case ACL_GROUP_OBJ:
144		case ACL_OTHER:
145			if (acl_get_tag_type(entry, &tag) == -1)
146				err(1, "acl_get_tag_type() failed");
147			if (acl_get_permset(entry, &perm) == -1)
148				err(1, "acl_get_permset() failed");
149			if (acl_create_entry(&acl_new, &entry_new) == -1)
150				err(1, "acl_create_entry() failed");
151			if (acl_set_tag_type(entry_new, tag) == -1)
152				err(1, "acl_set_tag_type() failed");
153			if (acl_set_permset(entry_new, perm) == -1)
154				err(1, "acl_get_permset() failed");
155			if (acl_copy_entry(entry_new, entry) == -1)
156				err(1, "acl_copy_entry() failed");
157			break;
158		case ACL_MASK:
159			have_mask_entry = 1;
160			break;
161		default:
162			break;
163		}
164	}
165	if (have_mask_entry && n_flag == 0) {
166		if (acl_calc_mask(&acl_new) == -1)
167			err(1, "acl_calc_mask() failed");
168	} else {
169		have_mask = 1;
170	}
171
172	if (acl_type == ACL_TYPE_ACCESS) {
173		acl_free(prev_acl[0]);
174		prev_acl[0] = acl_new;
175	} else {
176		acl_free(prev_acl[1]);
177		prev_acl[1] = acl_new;
178	}
179}
180