tsigconf.c revision 1.1.1.3 1 /* $NetBSD: tsigconf.c,v 1.1.1.3 2020/05/24 19:36:31 christos Exp $ */
2
3 /*
4 * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
5 *
6 * This Source Code Form is subject to the terms of the Mozilla Public
7 * License, v. 2.0. If a copy of the MPL was not distributed with this
8 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
9 *
10 * See the COPYRIGHT file distributed with this work for additional
11 * information regarding copyright ownership.
12 */
13
14 /*! \file */
15
16 #include <inttypes.h>
17
18 #include <isc/base64.h>
19 #include <isc/buffer.h>
20 #include <isc/mem.h>
21 #include <isc/string.h>
22 #include <isc/util.h>
23
24 #include <dns/result.h>
25 #include <dns/tsig.h>
26
27 #include <isccfg/cfg.h>
28
29 #include <named/config.h>
30 #include <named/log.h>
31 #include <named/tsigconf.h>
32
33 static isc_result_t
34 add_initial_keys(const cfg_obj_t *list, dns_tsig_keyring_t *ring,
35 isc_mem_t *mctx) {
36 dns_tsigkey_t *tsigkey = NULL;
37 const cfg_listelt_t *element;
38 const cfg_obj_t *key = NULL;
39 const char *keyid = NULL;
40 unsigned char *secret = NULL;
41 int secretalloc = 0;
42 int secretlen = 0;
43 isc_result_t ret;
44 isc_stdtime_t now;
45 uint16_t bits;
46
47 for (element = cfg_list_first(list); element != NULL;
48 element = cfg_list_next(element))
49 {
50 const cfg_obj_t *algobj = NULL;
51 const cfg_obj_t *secretobj = NULL;
52 dns_name_t keyname;
53 const dns_name_t *alg;
54 const char *algstr;
55 char keynamedata[1024];
56 isc_buffer_t keynamesrc, keynamebuf;
57 const char *secretstr;
58 isc_buffer_t secretbuf;
59
60 key = cfg_listelt_value(element);
61 keyid = cfg_obj_asstring(cfg_map_getname(key));
62
63 algobj = NULL;
64 secretobj = NULL;
65 (void)cfg_map_get(key, "algorithm", &algobj);
66 (void)cfg_map_get(key, "secret", &secretobj);
67 INSIST(algobj != NULL && secretobj != NULL);
68
69 /*
70 * Create the key name.
71 */
72 dns_name_init(&keyname, NULL);
73 isc_buffer_constinit(&keynamesrc, keyid, strlen(keyid));
74 isc_buffer_add(&keynamesrc, strlen(keyid));
75 isc_buffer_init(&keynamebuf, keynamedata, sizeof(keynamedata));
76 ret = dns_name_fromtext(&keyname, &keynamesrc, dns_rootname,
77 DNS_NAME_DOWNCASE, &keynamebuf);
78 if (ret != ISC_R_SUCCESS) {
79 goto failure;
80 }
81
82 /*
83 * Create the algorithm.
84 */
85 algstr = cfg_obj_asstring(algobj);
86 if (named_config_getkeyalgorithm(algstr, &alg, &bits) !=
87 ISC_R_SUCCESS) {
88 cfg_obj_log(algobj, named_g_lctx, ISC_LOG_ERROR,
89 "key '%s': has a "
90 "unsupported algorithm '%s'",
91 keyid, algstr);
92 ret = DNS_R_BADALG;
93 goto failure;
94 }
95
96 secretstr = cfg_obj_asstring(secretobj);
97 secretalloc = secretlen = strlen(secretstr) * 3 / 4;
98 secret = isc_mem_get(mctx, secretlen);
99 isc_buffer_init(&secretbuf, secret, secretlen);
100 ret = isc_base64_decodestring(secretstr, &secretbuf);
101 if (ret != ISC_R_SUCCESS) {
102 goto failure;
103 }
104 secretlen = isc_buffer_usedlength(&secretbuf);
105
106 isc_stdtime_get(&now);
107 ret = dns_tsigkey_create(&keyname, alg, secret, secretlen,
108 false, NULL, now, now, mctx, ring,
109 &tsigkey);
110 isc_mem_put(mctx, secret, secretalloc);
111 secret = NULL;
112 if (ret != ISC_R_SUCCESS) {
113 goto failure;
114 }
115 /*
116 * Set digest bits.
117 */
118 dst_key_setbits(tsigkey->key, bits);
119 dns_tsigkey_detach(&tsigkey);
120 }
121
122 return (ISC_R_SUCCESS);
123
124 failure:
125 cfg_obj_log(key, named_g_lctx, ISC_LOG_ERROR,
126 "configuring key '%s': %s", keyid, isc_result_totext(ret));
127
128 if (secret != NULL) {
129 isc_mem_put(mctx, secret, secretalloc);
130 }
131 return (ret);
132 }
133
134 isc_result_t
135 named_tsigkeyring_fromconfig(const cfg_obj_t *config, const cfg_obj_t *vconfig,
136 isc_mem_t *mctx, dns_tsig_keyring_t **ringp) {
137 const cfg_obj_t *maps[3];
138 const cfg_obj_t *keylist;
139 dns_tsig_keyring_t *ring = NULL;
140 isc_result_t result;
141 int i;
142
143 REQUIRE(ringp != NULL && *ringp == NULL);
144
145 i = 0;
146 if (config != NULL) {
147 maps[i++] = config;
148 }
149 if (vconfig != NULL) {
150 maps[i++] = cfg_tuple_get(vconfig, "options");
151 }
152 maps[i] = NULL;
153
154 result = dns_tsigkeyring_create(mctx, &ring);
155 if (result != ISC_R_SUCCESS) {
156 return (result);
157 }
158
159 for (i = 0;; i++) {
160 if (maps[i] == NULL) {
161 break;
162 }
163 keylist = NULL;
164 result = cfg_map_get(maps[i], "key", &keylist);
165 if (result != ISC_R_SUCCESS) {
166 continue;
167 }
168 result = add_initial_keys(keylist, ring, mctx);
169 if (result != ISC_R_SUCCESS) {
170 goto failure;
171 }
172 }
173
174 *ringp = ring;
175 return (ISC_R_SUCCESS);
176
177 failure:
178 dns_tsigkeyring_detach(&ring);
179 return (result);
180 }
181