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
180
181
182
183
|
/*
* Copyright (C) 2004-2007, 2010, 2012 Internet Systems Consortium, Inc. ("ISC")
* Copyright (C) 2002, 2003 Internet Software Consortium.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id: ds.c,v 1.13 2010/12/23 23:47:08 tbox Exp $ */
/*! \file */
#include <config.h>
#include <string.h>
#include <isc/buffer.h>
#include <isc/region.h>
#include <isc/sha1.h>
#include <isc/sha2.h>
#include <isc/util.h>
#include <dns/ds.h>
#include <dns/fixedname.h>
#include <dns/name.h>
#include <dns/rdata.h>
#include <dns/rdatastruct.h>
#include <dns/result.h>
#include <dst/dst.h>
#ifdef HAVE_OPENSSL_GOST
#include <dst/result.h>
#include <openssl/evp.h>
extern const EVP_MD * EVP_gost(void);
#endif
isc_result_t
dns_ds_buildrdata(dns_name_t *owner, dns_rdata_t *key,
unsigned int digest_type, unsigned char *buffer,
dns_rdata_t *rdata)
{
dns_fixedname_t fname;
dns_name_t *name;
unsigned char digest[ISC_SHA384_DIGESTLENGTH];
isc_region_t r;
isc_buffer_t b;
dns_rdata_ds_t ds;
isc_sha1_t sha1;
isc_sha256_t sha256;
isc_sha384_t sha384;
#ifdef HAVE_OPENSSL_GOST
EVP_MD_CTX ctx;
const EVP_MD *md;
#endif
REQUIRE(key != NULL);
REQUIRE(key->type == dns_rdatatype_dnskey);
if (!dns_ds_digest_supported(digest_type))
return (ISC_R_NOTIMPLEMENTED);
dns_fixedname_init(&fname);
name = dns_fixedname_name(&fname);
(void)dns_name_downcase(owner, name, NULL);
memset(buffer, 0, DNS_DS_BUFFERSIZE);
isc_buffer_init(&b, buffer, DNS_DS_BUFFERSIZE);
switch (digest_type) {
case DNS_DSDIGEST_SHA1:
isc_sha1_init(&sha1);
dns_name_toregion(name, &r);
isc_sha1_update(&sha1, r.base, r.length);
dns_rdata_toregion(key, &r);
INSIST(r.length >= 4);
isc_sha1_update(&sha1, r.base, r.length);
isc_sha1_final(&sha1, digest);
break;
#ifdef HAVE_OPENSSL_GOST
#define CHECK(x) \
if ((x) != 1) { \
EVP_MD_CTX_cleanup(&ctx); \
return (DST_R_CRYPTOFAILURE); \
}
case DNS_DSDIGEST_GOST:
md = EVP_gost();
if (md == NULL)
return (DST_R_CRYPTOFAILURE);
EVP_MD_CTX_init(&ctx);
CHECK(EVP_DigestInit(&ctx, md));
dns_name_toregion(name, &r);
CHECK(EVP_DigestUpdate(&ctx,
(const void *) r.base,
(size_t) r.length));
dns_rdata_toregion(key, &r);
INSIST(r.length >= 4);
CHECK(EVP_DigestUpdate(&ctx,
(const void *) r.base,
(size_t) r.length));
CHECK(EVP_DigestFinal(&ctx, digest, NULL));
break;
#endif
case DNS_DSDIGEST_SHA384:
isc_sha384_init(&sha384);
dns_name_toregion(name, &r);
isc_sha384_update(&sha384, r.base, r.length);
dns_rdata_toregion(key, &r);
INSIST(r.length >= 4);
isc_sha384_update(&sha384, r.base, r.length);
isc_sha384_final(digest, &sha384);
break;
case DNS_DSDIGEST_SHA256:
default:
isc_sha256_init(&sha256);
dns_name_toregion(name, &r);
isc_sha256_update(&sha256, r.base, r.length);
dns_rdata_toregion(key, &r);
INSIST(r.length >= 4);
isc_sha256_update(&sha256, r.base, r.length);
isc_sha256_final(digest, &sha256);
break;
}
ds.mctx = NULL;
ds.common.rdclass = key->rdclass;
ds.common.rdtype = dns_rdatatype_ds;
ds.algorithm = r.base[3];
ds.key_tag = dst_region_computeid(&r, ds.algorithm);
ds.digest_type = digest_type;
switch (digest_type) {
case DNS_DSDIGEST_SHA1:
ds.length = ISC_SHA1_DIGESTLENGTH;
break;
#ifdef HAVE_OPENSSL_GOST
case DNS_DSDIGEST_GOST:
ds.length = ISC_GOST_DIGESTLENGTH;
break;
#endif
case DNS_DSDIGEST_SHA384:
ds.length = ISC_SHA384_DIGESTLENGTH;
break;
case DNS_DSDIGEST_SHA256:
default:
ds.length = ISC_SHA256_DIGESTLENGTH;
break;
}
ds.digest = digest;
return (dns_rdata_fromstruct(rdata, key->rdclass, dns_rdatatype_ds,
&ds, &b));
}
isc_boolean_t
dns_ds_digest_supported(unsigned int digest_type) {
#ifdef HAVE_OPENSSL_GOST
return (ISC_TF(digest_type == DNS_DSDIGEST_SHA1 ||
digest_type == DNS_DSDIGEST_SHA256 ||
digest_type == DNS_DSDIGEST_GOST ||
digest_type == DNS_DSDIGEST_SHA384));
#else
return (ISC_TF(digest_type == DNS_DSDIGEST_SHA1 ||
digest_type == DNS_DSDIGEST_SHA256 ||
digest_type == DNS_DSDIGEST_SHA384));
#endif
}
|
