xref: /freebsd/bin/setfacl/merge.c (revision 6990ffd8a95caaba6858ad44ff1b3157d1efba8f)
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  * $FreeBSD$
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 <sysexits.h>
36 
37 #include "setfacl.h"
38 
39 /* merge acl into existing file's ACL */
40 int
41 merge_acl(acl_t acl, acl_t *prev_acl)
42 {
43 	acl_entry_t entry, entry_new;
44 	acl_permset_t permset;
45 	acl_t acl_new;
46 	acl_tag_t tag, tag_new;
47 	int entry_id, entry_id_new, have_entry;
48 	uid_t *id, *id_new;
49 
50 	if (acl_type == ACL_TYPE_ACCESS)
51 		acl_new = acl_dup(prev_acl[0]);
52 	else
53 		acl_new = acl_dup(prev_acl[1]);
54 	if (!acl_new)
55 		err(EX_OSERR, "acl_dup() failed");
56 
57 	entry_id = ACL_FIRST_ENTRY;
58 
59 	while (acl_get_entry(acl, entry_id, &entry) == 1) {
60 		entry_id = ACL_NEXT_ENTRY;
61 		have_entry = 0;
62 
63 		/* keep track of existing ACL_MASK entries */
64 		if (acl_get_tag_type(entry, &tag) == -1)
65 			err(EX_OSERR,
66 			    "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 &&
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(EX_OSERR, "acl_get_tag_type() failed");
78 			if (acl_get_tag_type(entry_new, &tag_new) == -1)
79 				err(EX_OSERR, "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(EX_OSERR,
89 					    "acl_get_qualifier() failed");
90 				id_new = acl_get_qualifier(entry_new);
91 				if (id_new == NULL)
92 					err(EX_OSERR,
93 					    "acl_get_qualifier() failed");
94 				if (*id == *id_new) {
95 					/* any other matches */
96 					if (acl_get_permset(entry, &permset)
97 					    == -1)
98 						err(EX_OSERR,
99 						    "acl_get_permset() failed");
100 					if (acl_set_permset(entry_new, permset)
101 					    == -1)
102 						err(EX_OSERR,
103 						    "acl_set_permset() failed");
104 					have_entry = 1;
105 				}
106 				acl_free(id);
107 				acl_free(id_new);
108 				if (!have_entry)
109 					break;
110 				/* FALLTHROUGH */
111 			case ACL_USER_OBJ:
112 			case ACL_GROUP_OBJ:
113 			case ACL_OTHER:
114 			case ACL_MASK:
115 				if (acl_get_permset(entry, &permset) == -1)
116 					err(EX_OSERR,
117 					    "acl_get_permset() failed");
118 				if (acl_set_permset(entry_new, permset) == -1)
119 					err(EX_OSERR,
120 					    "acl_set_permset() failed");
121 				have_entry = 1;
122 				break;
123 			default:
124 				/* should never be here */
125 				errx(EX_OSERR, "Invalid tag type: %i", tag);
126 				break;
127 			}
128 		}
129 
130 		/* if this entry has not been found, it must be new */
131 		if (!have_entry) {
132 			if (acl_create_entry(&acl_new, &entry_new) == -1) {
133 				acl_free(acl_new);
134 				return -1;
135 			}
136 			if (acl_copy_entry(entry_new, entry) == -1)
137 				err(EX_OSERR, "acl_copy_entry() failed");
138 		}
139 	}
140 
141 
142 	if (acl_type == ACL_TYPE_ACCESS) {
143 		acl_free(prev_acl[0]);
144 		prev_acl[0] = acl_new;
145 	} else {
146 		acl_free(prev_acl[1]);
147 		prev_acl[1] = acl_new;
148 	}
149 
150 
151 	return 0;
152 }
153