summaryrefslogtreecommitdiffstats
path: root/bin/setfacl/merge.c
blob: 9f1b5dd48f457b967e91f250b00a25501d82370b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
/*-
 * Copyright (c) 2001 Chris D. Faulhaber
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR THE VOICES IN HIS HEAD BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include <sys/types.h>
#include <sys/acl.h>
#include <sys/stat.h>

#include <err.h>
#include <stdio.h>

#include "setfacl.h"

static int merge_user_group(acl_entry_t *entry, acl_entry_t *entry_new);

static int
merge_user_group(acl_entry_t *entry, acl_entry_t *entry_new)
{
	acl_permset_t permset;
	int have_entry;
	uid_t *id, *id_new;

	have_entry = 0;

	id = acl_get_qualifier(*entry);
	if (id == NULL)
		err(1, "acl_get_qualifier() failed");
	id_new = acl_get_qualifier(*entry_new);
	if (id_new == NULL)
		err(1, "acl_get_qualifier() failed");
	if (*id == *id_new) {
		/* any other matches */
		if (acl_get_permset(*entry, &permset) == -1)
			err(1, "acl_get_permset() failed");
		if (acl_set_permset(*entry_new, permset) == -1)
			err(1, "acl_set_permset() failed");
		have_entry = 1;
	}
	acl_free(id);
	acl_free(id_new);

	return (have_entry);
}

/*
 * merge an ACL into existing file's ACL
 */
int
merge_acl(acl_t acl, acl_t *prev_acl)
{
	acl_entry_t entry, entry_new;
	acl_permset_t permset;
	acl_t acl_new;
	acl_tag_t tag, tag_new;
	int entry_id, entry_id_new, have_entry;

	if (acl_type == ACL_TYPE_ACCESS)
		acl_new = acl_dup(prev_acl[ACCESS_ACL]);
	else
		acl_new = acl_dup(prev_acl[DEFAULT_ACL]);
	if (acl_new == NULL)
		err(1, "acl_dup() failed");

	entry_id = ACL_FIRST_ENTRY;

	while (acl_get_entry(acl, entry_id, &entry) == 1) {
		entry_id = ACL_NEXT_ENTRY;
		have_entry = 0;

		/* keep track of existing ACL_MASK entries */
		if (acl_get_tag_type(entry, &tag) == -1)
			err(1, "acl_get_tag_type() failed - invalid ACL entry");
		if (tag == ACL_MASK)
			have_mask = 1;

		/* check against the existing ACL entries */
		entry_id_new = ACL_FIRST_ENTRY;
		while (have_entry == 0 &&
		    acl_get_entry(acl_new, entry_id_new, &entry_new) == 1) {
			entry_id_new = ACL_NEXT_ENTRY;

			if (acl_get_tag_type(entry, &tag) == -1)
				err(1, "acl_get_tag_type() failed");
			if (acl_get_tag_type(entry_new, &tag_new) == -1)
				err(1, "acl_get_tag_type() failed");
			if (tag != tag_new)
				continue;

			switch(tag) {
			case ACL_USER:
			case ACL_GROUP:
				have_entry = merge_user_group(&entry,
				    &entry_new);
				if (have_entry == 0)
					break;
				/* FALLTHROUGH */
			case ACL_USER_OBJ:
			case ACL_GROUP_OBJ:
			case ACL_OTHER:
			case ACL_MASK:
				if (acl_get_permset(entry, &permset) == -1)
					err(1, "acl_get_permset() failed");
				if (acl_set_permset(entry_new, permset) == -1)
					err(1, "acl_set_permset() failed");
				have_entry = 1;
				break;
			default:
				/* should never be here */
				errx(1, "Invalid tag type: %i", tag);
				break;
			}
		}

		/* if this entry has not been found, it must be new */
		if (have_entry == 0) {
			if (acl_create_entry(&acl_new, &entry_new) == -1) {
				acl_free(acl_new);
				return (-1);
			}
			if (acl_copy_entry(entry_new, entry) == -1)
				err(1, "acl_copy_entry() failed");
		}
	}

	if (acl_type == ACL_TYPE_ACCESS) {
		acl_free(prev_acl[ACCESS_ACL]);
		prev_acl[ACCESS_ACL] = acl_new;
	} else {
		acl_free(prev_acl[DEFAULT_ACL]);
		prev_acl[DEFAULT_ACL] = acl_new;
	}

	return (0);
}
OpenPOWER on IntegriCloud