1/*
2 * Copyright (C) 2009, 2010  Internet Systems Consortium, Inc. ("ISC")
3 *
4 * Permission to use, copy, modify, and/or distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
7 *
8 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
9 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
10 * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
11 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
12 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
13 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
14 * PERFORMANCE OF THIS SOFTWARE.
15 */
16
17/* $Id: tsec.c,v 1.7 2010/12/09 00:54:34 marka Exp $ */
18
19#include <config.h>
20
21#include <isc/mem.h>
22
23#include <dns/tsec.h>
24#include <dns/tsig.h>
25#include <dns/result.h>
26
27#include <dst/dst.h>
28
29#define DNS_TSEC_MAGIC			ISC_MAGIC('T', 's', 'e', 'c')
30#define DNS_TSEC_VALID(t)		ISC_MAGIC_VALID(t, DNS_TSEC_MAGIC)
31
32/*%
33 * DNS Transaction Security object.  We assume this is not shared by
34 * multiple threads, and so the structure does not contain a lock.
35 */
36struct dns_tsec {
37	unsigned int		magic;
38	dns_tsectype_t		type;
39	isc_mem_t		*mctx;
40	union {
41		dns_tsigkey_t	*tsigkey;
42		dst_key_t	*key;
43	} ukey;
44};
45
46isc_result_t
47dns_tsec_create(isc_mem_t *mctx, dns_tsectype_t type, dst_key_t *key,
48		dns_tsec_t **tsecp)
49{
50	isc_result_t result;
51	dns_tsec_t *tsec;
52	dns_tsigkey_t *tsigkey = NULL;
53	dns_name_t *algname;
54
55	REQUIRE(mctx != NULL);
56	REQUIRE(tsecp != NULL && *tsecp == NULL);
57
58	tsec = isc_mem_get(mctx, sizeof(*tsec));
59	if (tsec == NULL)
60		return (ISC_R_NOMEMORY);
61
62	tsec->type = type;
63	tsec->mctx = mctx;
64
65	switch (type) {
66	case dns_tsectype_tsig:
67		switch (dst_key_alg(key)) {
68		case DST_ALG_HMACMD5:
69			algname = dns_tsig_hmacmd5_name;
70			break;
71		case DST_ALG_HMACSHA1:
72			algname = dns_tsig_hmacsha1_name;
73			break;
74		case DST_ALG_HMACSHA224:
75			algname = dns_tsig_hmacsha224_name;
76			break;
77		case DST_ALG_HMACSHA256:
78			algname = dns_tsig_hmacsha256_name;
79			break;
80		case DST_ALG_HMACSHA384:
81			algname = dns_tsig_hmacsha384_name;
82			break;
83		case DST_ALG_HMACSHA512:
84			algname = dns_tsig_hmacsha512_name;
85			break;
86		default:
87			isc_mem_put(mctx, tsec, sizeof(*tsec));
88			return (DNS_R_BADALG);
89		}
90		result = dns_tsigkey_createfromkey(dst_key_name(key),
91						   algname, key, ISC_FALSE,
92						   NULL, 0, 0, mctx, NULL,
93						   &tsigkey);
94		if (result != ISC_R_SUCCESS) {
95			isc_mem_put(mctx, tsec, sizeof(*tsec));
96			return (result);
97		}
98		tsec->ukey.tsigkey = tsigkey;
99		break;
100	case dns_tsectype_sig0:
101		tsec->ukey.key = key;
102		break;
103	default:
104		INSIST(0);
105	}
106
107	tsec->magic = DNS_TSEC_MAGIC;
108
109	*tsecp = tsec;
110	return (ISC_R_SUCCESS);
111}
112
113void
114dns_tsec_destroy(dns_tsec_t **tsecp) {
115	dns_tsec_t *tsec;
116
117	REQUIRE(tsecp != NULL && *tsecp != NULL);
118	tsec = *tsecp;
119	REQUIRE(DNS_TSEC_VALID(tsec));
120
121	switch (tsec->type) {
122	case dns_tsectype_tsig:
123		dns_tsigkey_detach(&tsec->ukey.tsigkey);
124		break;
125	case dns_tsectype_sig0:
126		dst_key_free(&tsec->ukey.key);
127		break;
128	default:
129		INSIST(0);
130	}
131
132	tsec->magic = 0;
133	isc_mem_put(tsec->mctx, tsec, sizeof(*tsec));
134
135	*tsecp = NULL;
136}
137
138dns_tsectype_t
139dns_tsec_gettype(dns_tsec_t *tsec) {
140	REQUIRE(DNS_TSEC_VALID(tsec));
141
142	return (tsec->type);
143}
144
145void
146dns_tsec_getkey(dns_tsec_t *tsec, void *keyp) {
147	REQUIRE(DNS_TSEC_VALID(tsec));
148	REQUIRE(keyp != NULL);
149
150	switch (tsec->type) {
151	case dns_tsectype_tsig:
152		dns_tsigkey_attach(tsec->ukey.tsigkey, (dns_tsigkey_t **)keyp);
153		break;
154	case dns_tsectype_sig0:
155		*(dst_key_t **)keyp = tsec->ukey.key;
156		break;
157	default:
158		INSIST(0);
159	}
160}
161