tsigconf.c revision 1.7 1 /* $NetBSD: tsigconf.c,v 1.7 2023/01/25 21:43:23 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/string.h>
24 #include <isc/util.h>
25
26 #include <dns/result.h>
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_tsig_keyring_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 int secretlen = 0;
45 isc_result_t ret;
46 isc_stdtime_t now;
47 uint16_t bits;
48
49 for (element = cfg_list_first(list); element != NULL;
50 element = cfg_list_next(element))
51 {
52 const cfg_obj_t *algobj = NULL;
53 const cfg_obj_t *secretobj = NULL;
54 dns_name_t keyname;
55 const dns_name_t *alg;
56 const char *algstr;
57 char keynamedata[1024];
58 isc_buffer_t keynamesrc, keynamebuf;
59 const char *secretstr;
60 isc_buffer_t secretbuf;
61
62 key = cfg_listelt_value(element);
63 keyid = cfg_obj_asstring(cfg_map_getname(key));
64
65 algobj = NULL;
66 secretobj = NULL;
67 (void)cfg_map_get(key, "algorithm", &algobj);
68 (void)cfg_map_get(key, "secret", &secretobj);
69 INSIST(algobj != NULL && secretobj != NULL);
70
71 /*
72 * Create the key name.
73 */
74 dns_name_init(&keyname, NULL);
75 isc_buffer_constinit(&keynamesrc, keyid, strlen(keyid));
76 isc_buffer_add(&keynamesrc, strlen(keyid));
77 isc_buffer_init(&keynamebuf, keynamedata, sizeof(keynamedata));
78 ret = dns_name_fromtext(&keyname, &keynamesrc, dns_rootname,
79 DNS_NAME_DOWNCASE, &keynamebuf);
80 if (ret != ISC_R_SUCCESS) {
81 goto failure;
82 }
83
84 /*
85 * Create the algorithm.
86 */
87 algstr = cfg_obj_asstring(algobj);
88 if (named_config_getkeyalgorithm(algstr, &alg, &bits) !=
89 ISC_R_SUCCESS)
90 {
91 cfg_obj_log(algobj, named_g_lctx, ISC_LOG_ERROR,
92 "key '%s': has a "
93 "unsupported algorithm '%s'",
94 keyid, algstr);
95 ret = DNS_R_BADALG;
96 goto failure;
97 }
98
99 secretstr = cfg_obj_asstring(secretobj);
100 secretalloc = secretlen = strlen(secretstr) * 3 / 4;
101 secret = isc_mem_get(mctx, secretlen);
102 isc_buffer_init(&secretbuf, secret, secretlen);
103 ret = isc_base64_decodestring(secretstr, &secretbuf);
104 if (ret != ISC_R_SUCCESS) {
105 goto failure;
106 }
107 secretlen = isc_buffer_usedlength(&secretbuf);
108
109 isc_stdtime_get(&now);
110 ret = dns_tsigkey_create(&keyname, alg, secret, secretlen,
111 false, NULL, now, now, mctx, ring,
112 &tsigkey);
113 isc_mem_put(mctx, secret, secretalloc);
114 secret = NULL;
115 if (ret != ISC_R_SUCCESS) {
116 goto failure;
117 }
118 /*
119 * Set digest bits.
120 */
121 dst_key_setbits(tsigkey->key, bits);
122 dns_tsigkey_detach(&tsigkey);
123 }
124
125 return (ISC_R_SUCCESS);
126
127 failure:
128 cfg_obj_log(key, named_g_lctx, ISC_LOG_ERROR,
129 "configuring key '%s': %s", keyid, isc_result_totext(ret));
130
131 if (secret != NULL) {
132 isc_mem_put(mctx, secret, secretalloc);
133 }
134 return (ret);
135 }
136
137 isc_result_t
138 named_tsigkeyring_fromconfig(const cfg_obj_t *config, const cfg_obj_t *vconfig,
139 isc_mem_t *mctx, dns_tsig_keyring_t **ringp) {
140 const cfg_obj_t *maps[3];
141 const cfg_obj_t *keylist;
142 dns_tsig_keyring_t *ring = NULL;
143 isc_result_t result;
144 int i;
145
146 REQUIRE(ringp != NULL && *ringp == NULL);
147
148 i = 0;
149 if (config != NULL) {
150 maps[i++] = config;
151 }
152 if (vconfig != NULL) {
153 maps[i++] = cfg_tuple_get(vconfig, "options");
154 }
155 maps[i] = NULL;
156
157 result = dns_tsigkeyring_create(mctx, &ring);
158 if (result != ISC_R_SUCCESS) {
159 return (result);
160 }
161
162 for (i = 0;; i++) {
163 if (maps[i] == NULL) {
164 break;
165 }
166 keylist = NULL;
167 result = cfg_map_get(maps[i], "key", &keylist);
168 if (result != ISC_R_SUCCESS) {
169 continue;
170 }
171 result = add_initial_keys(keylist, ring, mctx);
172 if (result != ISC_R_SUCCESS) {
173 goto failure;
174 }
175 }
176
177 *ringp = ring;
178 return (ISC_R_SUCCESS);
179
180 failure:
181 dns_tsigkeyring_detach(&ring);
182 return (result);
183 }
184