merge.c revision 87259 
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 87259 2001-12-03 01:20:52Z 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
38/*
39 * merge an ACL into existing file's ACL
40 */
41int
42merge_acl(acl_t acl, acl_t *prev_acl)
43{
44	acl_entry_t entry, entry_new;
45	acl_permset_t permset;
46	acl_t acl_new;
47	acl_tag_t tag, tag_new;
48	int entry_id, entry_id_new, have_entry;
49	uid_t *id, *id_new;
50
51	if (acl_type == ACL_TYPE_ACCESS)
52		acl_new = acl_dup(prev_acl[ACCESS_ACL]);
53	else
54		acl_new = acl_dup(prev_acl[DEFAULT_ACL]);
55	if (acl_new == NULL)
56		err(1, "acl_dup() failed");
57
58	entry_id = ACL_FIRST_ENTRY;
59
60	while (acl_get_entry(acl, entry_id, &entry) == 1) {
61		entry_id = ACL_NEXT_ENTRY;
62		have_entry = 0;
63
64		/* keep track of existing ACL_MASK entries */
65		if (acl_get_tag_type(entry, &tag) == -1)
66			err(1, "acl_get_tag_type() failed - invalid ACL entry");
67		if (tag == ACL_MASK)
68			have_mask = 1;
69
70		/* check against the existing ACL entries */
71		entry_id_new = ACL_FIRST_ENTRY;
72		while (have_entry == 0 &&
73		    acl_get_entry(acl_new, entry_id_new, &entry_new) == 1) {
74			entry_id_new = ACL_NEXT_ENTRY;
75
76			if (acl_get_tag_type(entry, &tag) == -1)
77				err(1, "acl_get_tag_type() failed");
78			if (acl_get_tag_type(entry_new, &tag_new) == -1)
79				err(1, "acl_get_tag_type() failed");
80			if (tag != tag_new)
81				continue;
82
83			switch(tag) {
84			case ACL_USER:
85			case ACL_GROUP:
86				id = acl_get_qualifier(entry);
87				if (id == NULL)
88					err(1, "acl_get_qualifier() failed");
89				id_new = acl_get_qualifier(entry_new);
90				if (id_new == NULL)
91					err(1, "acl_get_qualifier() failed");
92				if (*id == *id_new) {
93					/* any other matches */
94					if (acl_get_permset(entry, &permset)
95					    == -1)
96						err(1,
97						    "acl_get_permset() failed");
98					if (acl_set_permset(entry_new, permset)
99					    == -1)
100						err(1,
101						    "acl_set_permset() failed");
102					have_entry = 1;
103				}
104				acl_free(id);
105				acl_free(id_new);
106				if (have_entry == 0)
107					break;
108				/* FALLTHROUGH */
109			case ACL_USER_OBJ:
110			case ACL_GROUP_OBJ:
111			case ACL_OTHER:
112			case ACL_MASK:
113				if (acl_get_permset(entry, &permset) == -1)
114					err(1, "acl_get_permset() failed");
115				if (acl_set_permset(entry_new, permset) == -1)
116					err(1, "acl_set_permset() failed");
117				have_entry = 1;
118				break;
119			default:
120				/* should never be here */
121				errx(1, "Invalid tag type: %i", tag);
122				break;
123			}
124		}
125
126		/* if this entry has not been found, it must be new */
127		if (have_entry == 0) {
128			if (acl_create_entry(&acl_new, &entry_new) == -1) {
129				acl_free(acl_new);
130				return (-1);
131			}
132			if (acl_copy_entry(entry_new, entry) == -1)
133				err(1, "acl_copy_entry() failed");
134		}
135	}
136
137
138	if (acl_type == ACL_TYPE_ACCESS) {
139		acl_free(prev_acl[ACCESS_ACL]);
140		prev_acl[ACCESS_ACL] = acl_new;
141	} else {
142		acl_free(prev_acl[DEFAULT_ACL]);
143		prev_acl[DEFAULT_ACL] = acl_new;
144	}
145
146
147	return (0);
148}
149