merge.c revision 90888 
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/merge.c 90888 2002-02-19 02:36:35Z 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
36#include "setfacl.h"
37
38static int merge_user_group(acl_entry_t *entry, acl_entry_t *entry_new);
39
40static int
41merge_user_group(acl_entry_t *entry, acl_entry_t *entry_new)
42{
43	acl_permset_t permset;
44	int have_entry;
45	uid_t *id, *id_new;
46
47	have_entry = 0;
48
49	id = acl_get_qualifier(*entry);
50	if (id == NULL)
51		err(1, "acl_get_qualifier() failed");
52	id_new = acl_get_qualifier(*entry_new);
53	if (id_new == NULL)
54		err(1, "acl_get_qualifier() failed");
55	if (*id == *id_new) {
56		/* any other matches */
57		if (acl_get_permset(*entry, &permset) == -1)
58			err(1, "acl_get_permset() failed");
59		if (acl_set_permset(*entry_new, permset) == -1)
60			err(1, "acl_set_permset() failed");
61		have_entry = 1;
62	}
63	acl_free(id);
64	acl_free(id_new);
65
66	return (have_entry);
67}
68
69/*
70 * merge an ACL into existing file's ACL
71 */
72int
73merge_acl(acl_t acl, acl_t *prev_acl)
74{
75	acl_entry_t entry, entry_new;
76	acl_permset_t permset;
77	acl_t acl_new;
78	acl_tag_t tag, tag_new;
79	int entry_id, entry_id_new, have_entry;
80
81	if (acl_type == ACL_TYPE_ACCESS)
82		acl_new = acl_dup(prev_acl[ACCESS_ACL]);
83	else
84		acl_new = acl_dup(prev_acl[DEFAULT_ACL]);
85	if (acl_new == NULL)
86		err(1, "acl_dup() failed");
87
88	entry_id = ACL_FIRST_ENTRY;
89
90	while (acl_get_entry(acl, entry_id, &entry) == 1) {
91		entry_id = ACL_NEXT_ENTRY;
92		have_entry = 0;
93
94		/* keep track of existing ACL_MASK entries */
95		if (acl_get_tag_type(entry, &tag) == -1)
96			err(1, "acl_get_tag_type() failed - invalid ACL entry");
97		if (tag == ACL_MASK)
98			have_mask = 1;
99
100		/* check against the existing ACL entries */
101		entry_id_new = ACL_FIRST_ENTRY;
102		while (have_entry == 0 &&
103		    acl_get_entry(acl_new, entry_id_new, &entry_new) == 1) {
104			entry_id_new = ACL_NEXT_ENTRY;
105
106			if (acl_get_tag_type(entry, &tag) == -1)
107				err(1, "acl_get_tag_type() failed");
108			if (acl_get_tag_type(entry_new, &tag_new) == -1)
109				err(1, "acl_get_tag_type() failed");
110			if (tag != tag_new)
111				continue;
112
113			switch(tag) {
114			case ACL_USER:
115			case ACL_GROUP:
116				have_entry = merge_user_group(&entry,
117				    &entry_new);
118				if (have_entry == 0)
119					break;
120				/* FALLTHROUGH */
121			case ACL_USER_OBJ:
122			case ACL_GROUP_OBJ:
123			case ACL_OTHER:
124			case ACL_MASK:
125				if (acl_get_permset(entry, &permset) == -1)
126					err(1, "acl_get_permset() failed");
127				if (acl_set_permset(entry_new, permset) == -1)
128					err(1, "acl_set_permset() failed");
129				have_entry = 1;
130				break;
131			default:
132				/* should never be here */
133				errx(1, "Invalid tag type: %i", tag);
134				break;
135			}
136		}
137
138		/* if this entry has not been found, it must be new */
139		if (have_entry == 0) {
140			if (acl_create_entry(&acl_new, &entry_new) == -1) {
141				acl_free(acl_new);
142				return (-1);
143			}
144			if (acl_copy_entry(entry_new, entry) == -1)
145				err(1, "acl_copy_entry() failed");
146		}
147	}
148
149	if (acl_type == ACL_TYPE_ACCESS) {
150		acl_free(prev_acl[ACCESS_ACL]);
151		prev_acl[ACCESS_ACL] = acl_new;
152	} else {
153		acl_free(prev_acl[DEFAULT_ACL]);
154		prev_acl[DEFAULT_ACL] = acl_new;
155	}
156
157	return (0);
158}
159