summaryrefslogtreecommitdiffstats
path: root/bin/named/tsigconf.c
blob: 3426f928678bf15c387dae733d5cc384e990c4c5 (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
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
/*
 * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * See the COPYRIGHT file distributed with this work for additional
 * information regarding copyright ownership.
 */


/*! \file */

#include <config.h>

#include <inttypes.h>

#include <isc/base64.h>
#include <isc/buffer.h>
#include <isc/mem.h>
#include <isc/string.h>
#include <isc/util.h>

#include <isccfg/cfg.h>

#include <dns/tsig.h>
#include <dns/result.h>

#include <named/log.h>

#include <named/config.h>
#include <named/tsigconf.h>

static isc_result_t
add_initial_keys(const cfg_obj_t *list, dns_tsig_keyring_t *ring,
		 isc_mem_t *mctx)
{
	dns_tsigkey_t *tsigkey = NULL;
	const cfg_listelt_t *element;
	const cfg_obj_t *key = NULL;
	const char *keyid = NULL;
	unsigned char *secret = NULL;
	int secretalloc = 0;
	int secretlen = 0;
	isc_result_t ret;
	isc_stdtime_t now;
	uint16_t bits;

	for (element = cfg_list_first(list);
	     element != NULL;
	     element = cfg_list_next(element))
	{
		const cfg_obj_t *algobj = NULL;
		const cfg_obj_t *secretobj = NULL;
		dns_name_t keyname;
		dns_name_t *alg;
		const char *algstr;
		char keynamedata[1024];
		isc_buffer_t keynamesrc, keynamebuf;
		const char *secretstr;
		isc_buffer_t secretbuf;

		key = cfg_listelt_value(element);
		keyid = cfg_obj_asstring(cfg_map_getname(key));

		algobj = NULL;
		secretobj = NULL;
		(void)cfg_map_get(key, "algorithm", &algobj);
		(void)cfg_map_get(key, "secret", &secretobj);
		INSIST(algobj != NULL && secretobj != NULL);

		/*
		 * Create the key name.
		 */
		dns_name_init(&keyname, NULL);
		isc_buffer_constinit(&keynamesrc, keyid, strlen(keyid));
		isc_buffer_add(&keynamesrc, strlen(keyid));
		isc_buffer_init(&keynamebuf, keynamedata, sizeof(keynamedata));
		ret = dns_name_fromtext(&keyname, &keynamesrc, dns_rootname,
					DNS_NAME_DOWNCASE, &keynamebuf);
		if (ret != ISC_R_SUCCESS)
			goto failure;

		/*
		 * Create the algorithm.
		 */
		algstr = cfg_obj_asstring(algobj);
		if (ns_config_getkeyalgorithm(algstr, &alg, &bits)
		    != ISC_R_SUCCESS) {
			cfg_obj_log(algobj, ns_g_lctx, ISC_LOG_ERROR,
				    "key '%s': has a unsupported algorithm '%s'",
				    keyid, algstr);
			ret = DNS_R_BADALG;
			goto failure;
		}

		secretstr = cfg_obj_asstring(secretobj);
		secretalloc = secretlen = strlen(secretstr) * 3 / 4;
		secret = isc_mem_get(mctx, secretlen);
		if (secret == NULL) {
			ret = ISC_R_NOMEMORY;
			goto failure;
		}
		isc_buffer_init(&secretbuf, secret, secretlen);
		ret = isc_base64_decodestring(secretstr, &secretbuf);
		if (ret != ISC_R_SUCCESS)
			goto failure;
		secretlen = isc_buffer_usedlength(&secretbuf);

		isc_stdtime_get(&now);
		ret = dns_tsigkey_create(&keyname, alg, secret, secretlen,
					 false, NULL, now, now,
					 mctx, ring, &tsigkey);
		isc_mem_put(mctx, secret, secretalloc);
		secret = NULL;
		if (ret != ISC_R_SUCCESS)
			goto failure;
		/*
		 * Set digest bits.
		 */
		dst_key_setbits(tsigkey->key, bits);
		dns_tsigkey_detach(&tsigkey);
	}

	return (ISC_R_SUCCESS);

 failure:
	cfg_obj_log(key, ns_g_lctx, ISC_LOG_ERROR,
		    "configuring key '%s': %s", keyid,
		    isc_result_totext(ret));

	if (secret != NULL)
		isc_mem_put(mctx, secret, secretalloc);
	return (ret);
}

isc_result_t
ns_tsigkeyring_fromconfig(const cfg_obj_t *config, const cfg_obj_t *vconfig,
			  isc_mem_t *mctx, dns_tsig_keyring_t **ringp)
{
	const cfg_obj_t *maps[3];
	const cfg_obj_t *keylist;
	dns_tsig_keyring_t *ring = NULL;
	isc_result_t result;
	int i;

	REQUIRE(ringp != NULL && *ringp == NULL);

	i = 0;
	if (config != NULL)
		maps[i++] = config;
	if (vconfig != NULL)
		maps[i++] = cfg_tuple_get(vconfig, "options");
	maps[i] = NULL;

	result = dns_tsigkeyring_create(mctx, &ring);
	if (result != ISC_R_SUCCESS)
		return (result);

	for (i = 0; ; i++) {
		if (maps[i] == NULL)
			break;
		keylist = NULL;
		result = cfg_map_get(maps[i], "key", &keylist);
		if (result != ISC_R_SUCCESS)
			continue;
		result = add_initial_keys(keylist, ring, mctx);
		if (result != ISC_R_SUCCESS)
			goto failure;
	}

	*ringp = ring;
	return (ISC_R_SUCCESS);

 failure:
	dns_tsigkeyring_detach(&ring);
	return (result);
}