tsigconf.c revision 1.1.1.8 1 /* $NetBSD: tsigconf.c,v 1.1.1.8 2025/01/26 16:12:26 christos Exp $ */
2
3 /*
4 * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
5 *
6 * SPDX-License-Identifier: MPL-2.0
7 *
8 * This Source Code Form is subject to the terms of the Mozilla Public
9 * License, v. 2.0. If a copy of the MPL was not distributed with this
10 * file, you can obtain one at https://mozilla.org/MPL/2.0/.
11 *
12 * See the COPYRIGHT file distributed with this work for additional
13 * information regarding copyright ownership.
14 */
15
16 /*! \file */
17
18 #include <inttypes.h>
19
20 #include <isc/base64.h>
21 #include <isc/buffer.h>
22 #include <isc/mem.h>
23 #include <isc/result.h>
24 #include <isc/string.h>
25 #include <isc/util.h>
26
27 #include <dns/tsig.h>
28
29 #include <isccfg/cfg.h>
30
31 #include <named/config.h>
32 #include <named/log.h>
33 #include <named/tsigconf.h>
34
35 static isc_result_t
36 add_initial_keys(const cfg_obj_t *list, dns_tsigkeyring_t *ring,
37 isc_mem_t *mctx) {
38 dns_tsigkey_t *tsigkey = NULL;
39 const cfg_listelt_t *element;
40 const cfg_obj_t *key = NULL;
41 const char *keyid = NULL;
42 unsigned char *secret = NULL;
43 int secretalloc = 0;
44 isc_result_t ret;
45
46 for (element = cfg_list_first(list); element != NULL;
47 element = cfg_list_next(element))
48 {
49 const cfg_obj_t *algobj = NULL;
50 const cfg_obj_t *secretobj = NULL;
51 dns_name_t keyname;
52 dst_algorithm_t alg = DST_ALG_UNKNOWN;
53 const char *algstr = NULL;
54 char keynamedata[1024];
55 isc_buffer_t keynamesrc, keynamebuf;
56 const char *secretstr = NULL;
57 isc_buffer_t secretbuf;
58 int secretlen = 0;
59 uint16_t bits;
60
61 key = cfg_listelt_value(element);
62 keyid = cfg_obj_asstring(cfg_map_getname(key));
63
64 algobj = NULL;
65 secretobj = NULL;
66 (void)cfg_map_get(key, "algorithm", &algobj);
67 (void)cfg_map_get(key, "secret", &secretobj);
68 INSIST(algobj != NULL && secretobj != NULL);
69
70 /*
71 * Create the key name.
72 */
73 dns_name_init(&keyname, NULL);
74 isc_buffer_constinit(&keynamesrc, keyid, strlen(keyid));
75 isc_buffer_add(&keynamesrc, strlen(keyid));
76 isc_buffer_init(&keynamebuf, keynamedata, sizeof(keynamedata));
77 ret = dns_name_fromtext(&keyname, &keynamesrc, dns_rootname,
78 DNS_NAME_DOWNCASE, &keynamebuf);
79 if (ret != ISC_R_SUCCESS) {
80 goto failure;
81 }
82
83 /*
84 * Create the algorithm.
85 */
86 algstr = cfg_obj_asstring(algobj);
87 if (named_config_getkeyalgorithm(algstr, &alg, &bits) !=
88 ISC_R_SUCCESS)
89 {
90 cfg_obj_log(algobj, named_g_lctx, ISC_LOG_ERROR,
91 "key '%s': has a "
92 "unsupported algorithm '%s'",
93 keyid, algstr);
94 ret = DNS_R_BADALG;
95 goto failure;
96 }
97
98 secretstr = cfg_obj_asstring(secretobj);
99 secretalloc = secretlen = strlen(secretstr) * 3 / 4;
100 secret = isc_mem_get(mctx, secretlen);
101 isc_buffer_init(&secretbuf, secret, secretlen);
102 ret = isc_base64_decodestring(secretstr, &secretbuf);
103 if (ret != ISC_R_SUCCESS) {
104 goto failure;
105 }
106 secretlen = isc_buffer_usedlength(&secretbuf);
107
108 ret = dns_tsigkey_create(&keyname, alg, secret, secretlen, mctx,
109 &tsigkey);
110 isc_mem_put(mctx, secret, secretalloc);
111 secret = NULL;
112 if (ret == ISC_R_SUCCESS) {
113 ret = dns_tsigkeyring_add(ring, tsigkey);
114 }
115 if (ret != ISC_R_SUCCESS) {
116 if (tsigkey != NULL) {
117 dns_tsigkey_detach(&tsigkey);
118 }
119 goto failure;
120 }
121 /*
122 * Set digest bits.
123 */
124 dst_key_setbits(tsigkey->key, bits);
125 dns_tsigkey_detach(&tsigkey);
126 }
127
128 return ISC_R_SUCCESS;
129
130 failure:
131 if (secret != NULL) {
132 isc_mem_put(mctx, secret, secretalloc);
133 }
134 cfg_obj_log(key, named_g_lctx, ISC_LOG_ERROR,
135 "configuring key '%s': %s", keyid, isc_result_totext(ret));
136 return ret;
137 }
138
139 isc_result_t
140 named_tsigkeyring_fromconfig(const cfg_obj_t *config, const cfg_obj_t *vconfig,
141 isc_mem_t *mctx, dns_tsigkeyring_t **ringp) {
142 const cfg_obj_t *maps[3];
143 const cfg_obj_t *keylist;
144 dns_tsigkeyring_t *ring = NULL;
145 isc_result_t result;
146 int i;
147
148 REQUIRE(ringp != NULL && *ringp == NULL);
149
150 i = 0;
151 if (config != NULL) {
152 maps[i++] = config;
153 }
154 if (vconfig != NULL) {
155 maps[i++] = cfg_tuple_get(vconfig, "options");
156 }
157 maps[i] = NULL;
158
159 dns_tsigkeyring_create(mctx, &ring);
160
161 for (i = 0;; i++) {
162 if (maps[i] == NULL) {
163 break;
164 }
165 keylist = NULL;
166 result = cfg_map_get(maps[i], "key", &keylist);
167 if (result != ISC_R_SUCCESS) {
168 continue;
169 }
170 result = add_initial_keys(keylist, ring, mctx);
171 if (result != ISC_R_SUCCESS) {
172 goto failure;
173 }
174 }
175
176 *ringp = ring;
177 return ISC_R_SUCCESS;
178
179 failure:
180 dns_tsigkeyring_detach(&ring);
181 return result;
182 }
183