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
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
|
/*
* daemon/acl_list.h - client access control storage for the server.
*
* Copyright (c) 2007, NLnet Labs. All rights reserved.
*
* This software is open source.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 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.
*
* Neither the name of the NLNET LABS nor the names of its contributors may
* be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 REGENTS OR CONTRIBUTORS 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.
*/
/**
* \file
*
* This file helps the server keep out queries from outside sources, that
* should not be answered.
*/
#include "config.h"
#include "daemon/acl_list.h"
#include "util/regional.h"
#include "util/log.h"
#include "util/config_file.h"
#include "util/net_help.h"
struct acl_list*
acl_list_create(void)
{
struct acl_list* acl = (struct acl_list*)calloc(1,
sizeof(struct acl_list));
if(!acl)
return NULL;
acl->region = regional_create();
if(!acl->region) {
acl_list_delete(acl);
return NULL;
}
return acl;
}
void
acl_list_delete(struct acl_list* acl)
{
if(!acl)
return;
regional_destroy(acl->region);
free(acl);
}
/** insert new address into acl_list structure */
static int
acl_list_insert(struct acl_list* acl, struct sockaddr_storage* addr,
socklen_t addrlen, int net, enum acl_access control,
int complain_duplicates)
{
struct acl_addr* node = regional_alloc(acl->region,
sizeof(struct acl_addr));
if(!node)
return 0;
node->control = control;
if(!addr_tree_insert(&acl->tree, &node->node, addr, addrlen, net)) {
if(complain_duplicates)
verbose(VERB_QUERY, "duplicate acl address ignored.");
}
return 1;
}
/** apply acl_list string */
static int
acl_list_str_cfg(struct acl_list* acl, const char* str, const char* s2,
int complain_duplicates)
{
struct sockaddr_storage addr;
int net;
socklen_t addrlen;
enum acl_access control;
if(strcmp(s2, "allow") == 0)
control = acl_allow;
else if(strcmp(s2, "deny") == 0)
control = acl_deny;
else if(strcmp(s2, "refuse") == 0)
control = acl_refuse;
else if(strcmp(s2, "allow_snoop") == 0)
control = acl_allow_snoop;
else {
log_err("access control type %s unknown", str);
return 0;
}
if(!netblockstrtoaddr(str, UNBOUND_DNS_PORT, &addr, &addrlen, &net)) {
log_err("cannot parse access control: %s %s", str, s2);
return 0;
}
if(!acl_list_insert(acl, &addr, addrlen, net, control,
complain_duplicates)) {
log_err("out of memory");
return 0;
}
return 1;
}
/** read acl_list config */
static int
read_acl_list(struct acl_list* acl, struct config_file* cfg)
{
struct config_str2list* p;
for(p = cfg->acls; p; p = p->next) {
log_assert(p->str && p->str2);
if(!acl_list_str_cfg(acl, p->str, p->str2, 1))
return 0;
}
return 1;
}
int
acl_list_apply_cfg(struct acl_list* acl, struct config_file* cfg)
{
regional_free_all(acl->region);
addr_tree_init(&acl->tree);
if(!read_acl_list(acl, cfg))
return 0;
/* insert defaults, with '0' to ignore them if they are duplicates */
if(!acl_list_str_cfg(acl, "0.0.0.0/0", "refuse", 0))
return 0;
if(!acl_list_str_cfg(acl, "127.0.0.0/8", "allow", 0))
return 0;
if(cfg->do_ip6) {
if(!acl_list_str_cfg(acl, "::0/0", "refuse", 0))
return 0;
if(!acl_list_str_cfg(acl, "::1", "allow", 0))
return 0;
if(!acl_list_str_cfg(acl, "::ffff:127.0.0.1", "allow", 0))
return 0;
}
addr_tree_init_parents(&acl->tree);
return 1;
}
enum acl_access
acl_list_lookup(struct acl_list* acl, struct sockaddr_storage* addr,
socklen_t addrlen)
{
struct acl_addr* r = (struct acl_addr*)addr_tree_lookup(&acl->tree,
addr, addrlen);
if(r) return r->control;
return acl_deny;
}
size_t
acl_list_get_mem(struct acl_list* acl)
{
if(!acl) return 0;
return sizeof(*acl) + regional_get_mem(acl->region);
}
|
