merge.c revision 99110 
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
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: head/bin/setfacl/merge.c 99110 2002-06-30 05:15:05Z obrien $");
29
30#include <sys/types.h>
31#include <sys/acl.h>
32#include <sys/stat.h>
33
34#include <err.h>
35#include <stdio.h>
36
37#include "setfacl.h"
38
39static int merge_user_group(acl_entry_t *entry, acl_entry_t *entry_new);
40
41static int
42merge_user_group(acl_entry_t *entry, acl_entry_t *entry_new)
43{
44	acl_permset_t permset;
45	int have_entry;
46	uid_t *id, *id_new;
47
48	have_entry = 0;
49
50	id = acl_get_qualifier(*entry);
51	if (id == NULL)
52		err(1, "acl_get_qualifier() failed");
53	id_new = acl_get_qualifier(*entry_new);
54	if (id_new == NULL)
55		err(1, "acl_get_qualifier() failed");
56	if (*id == *id_new) {
57		/* any other matches */
58		if (acl_get_permset(*entry, &permset) == -1)
59			err(1, "acl_get_permset() failed");
60		if (acl_set_permset(*entry_new, permset) == -1)
61			err(1, "acl_set_permset() failed");
62		have_entry = 1;
63	}
64	acl_free(id);
65	acl_free(id_new);
66
67	return (have_entry);
68}
69
70/*
71 * merge an ACL into existing file's ACL
72 */
73int
74merge_acl(acl_t acl, acl_t *prev_acl)
75{
76	acl_entry_t entry, entry_new;
77	acl_permset_t permset;
78	acl_t acl_new;
79	acl_tag_t tag, tag_new;
80	int entry_id, entry_id_new, have_entry;
81
82	if (acl_type == ACL_TYPE_ACCESS)
83		acl_new = acl_dup(prev_acl[ACCESS_ACL]);
84	else
85		acl_new = acl_dup(prev_acl[DEFAULT_ACL]);
86	if (acl_new == NULL)
87		err(1, "acl_dup() failed");
88
89	entry_id = ACL_FIRST_ENTRY;
90
91	while (acl_get_entry(acl, entry_id, &entry) == 1) {
92		entry_id = ACL_NEXT_ENTRY;
93		have_entry = 0;
94
95		/* keep track of existing ACL_MASK entries */
96		if (acl_get_tag_type(entry, &tag) == -1)
97			err(1, "acl_get_tag_type() failed - invalid ACL entry");
98		if (tag == ACL_MASK)
99			have_mask = 1;
100
101		/* check against the existing ACL entries */
102		entry_id_new = ACL_FIRST_ENTRY;
103		while (have_entry == 0 &&
104		    acl_get_entry(acl_new, entry_id_new, &entry_new) == 1) {
105			entry_id_new = ACL_NEXT_ENTRY;
106
107			if (acl_get_tag_type(entry, &tag) == -1)
108				err(1, "acl_get_tag_type() failed");
109			if (acl_get_tag_type(entry_new, &tag_new) == -1)
110				err(1, "acl_get_tag_type() failed");
111			if (tag != tag_new)
112				continue;
113
114			switch(tag) {
115			case ACL_USER:
116			case ACL_GROUP:
117				have_entry = merge_user_group(&entry,
118				    &entry_new);
119				if (have_entry == 0)
120					break;
121				/* FALLTHROUGH */
122			case ACL_USER_OBJ:
123			case ACL_GROUP_OBJ:
124			case ACL_OTHER:
125			case ACL_MASK:
126				if (acl_get_permset(entry, &permset) == -1)
127					err(1, "acl_get_permset() failed");
128				if (acl_set_permset(entry_new, permset) == -1)
129					err(1, "acl_set_permset() failed");
130				have_entry = 1;
131				break;
132			default:
133				/* should never be here */
134				errx(1, "Invalid tag type: %i", tag);
135				break;
136			}
137		}
138
139		/* if this entry has not been found, it must be new */
140		if (have_entry == 0) {
141			if (acl_create_entry(&acl_new, &entry_new) == -1) {
142				acl_free(acl_new);
143				return (-1);
144			}
145			if (acl_copy_entry(entry_new, entry) == -1)
146				err(1, "acl_copy_entry() failed");
147		}
148	}
149
150	if (acl_type == ACL_TYPE_ACCESS) {
151		acl_free(prev_acl[ACCESS_ACL]);
152		prev_acl[ACCESS_ACL] = acl_new;
153	} else {
154		acl_free(prev_acl[DEFAULT_ACL]);
155		prev_acl[DEFAULT_ACL] = acl_new;
156	}
157
158	return (0);
159}
160