contrib/bind9/lib/dns/ds.c

   1 /*
   2  * Copyright (C) 2004-2007, 2010  Internet Systems Consortium, Inc. ("ISC")
   3  * Copyright (C) 2002, 2003  Internet Software Consortium.
   4  *
   5  * Permission to use, copy, modify, and/or distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
  10  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
  11  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
  12  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
  13  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
  14  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  15  * PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 /* $Id: ds.c,v 1.13 2010-12-23 23:47:08 tbox Exp $ */
  19
  20 /*! \file */
  21
  22 #include <config.h>
  23
  24 #include <string.h>
  25
  26 #include <isc/buffer.h>
  27 #include <isc/region.h>
  28 #include <isc/sha1.h>
  29 #include <isc/sha2.h>
  30 #include <isc/util.h>
  31
  32 #include <dns/ds.h>
  33 #include <dns/fixedname.h>
  34 #include <dns/name.h>
  35 #include <dns/rdata.h>
  36 #include <dns/rdatastruct.h>
  37 #include <dns/result.h>
  38
  39 #include <dst/dst.h>
  40
  41 #ifdef HAVE_OPENSSL_GOST
  42 #include <dst/result.h>
  43 #include <openssl/evp.h>
  44
  45 extern const EVP_MD * EVP_gost(void);
  46 #endif
  47
  48 isc_result_t
  49 dns_ds_buildrdata(dns_name_t *owner, dns_rdata_t *key,
  50                   unsigned int digest_type, unsigned char *buffer,
  51                   dns_rdata_t *rdata)
  52 {
  53         dns_fixedname_t fname;
  54         dns_name_t *name;
  55         unsigned char digest[ISC_SHA256_DIGESTLENGTH];
  56         isc_region_t r;
  57         isc_buffer_t b;
  58         dns_rdata_ds_t ds;
  59         isc_sha1_t sha1;
  60         isc_sha256_t sha256;
  61 #ifdef HAVE_OPENSSL_GOST
  62         EVP_MD_CTX ctx;
  63         const EVP_MD *md;
  64 #endif
  65
  66         REQUIRE(key != NULL);
  67         REQUIRE(key->type == dns_rdatatype_dnskey);
  68
  69         if (!dns_ds_digest_supported(digest_type))
  70                 return (ISC_R_NOTIMPLEMENTED);
  71
  72         dns_fixedname_init(&fname);
  73         name = dns_fixedname_name(&fname);
  74         (void)dns_name_downcase(owner, name, NULL);
  75
  76         memset(buffer, 0, DNS_DS_BUFFERSIZE);
  77         isc_buffer_init(&b, buffer, DNS_DS_BUFFERSIZE);
  78
  79         switch (digest_type) {
  80         case DNS_DSDIGEST_SHA1:
  81                 isc_sha1_init(&sha1);
  82                 dns_name_toregion(name, &r);
  83                 isc_sha1_update(&sha1, r.base, r.length);
  84                 dns_rdata_toregion(key, &r);
  85                 INSIST(r.length >= 4);
  86                 isc_sha1_update(&sha1, r.base, r.length);
  87                 isc_sha1_final(&sha1, digest);
  88                 break;
  89 #ifdef HAVE_OPENSSL_GOST
  90 #define CHECK(x)                                        \
  91         if ((x) != 1) {                                 \
  92                 EVP_MD_CTX_cleanup(&ctx);               \
  93                 return (DST_R_OPENSSLFAILURE);          \
  94         }
  95
  96         case DNS_DSDIGEST_GOST:
  97                 md = EVP_gost();
  98                 if (md == NULL)
  99                         return (DST_R_OPENSSLFAILURE);
 100                 EVP_MD_CTX_init(&ctx);
 101                 CHECK(EVP_DigestInit(&ctx, md));
 102                 dns_name_toregion(name, &r);
 103                 CHECK(EVP_DigestUpdate(&ctx,
 104                                        (const void *) r.base,
 105                                        (size_t) r.length));
 106                 dns_rdata_toregion(key, &r);
 107                 INSIST(r.length >= 4);
 108                 CHECK(EVP_DigestUpdate(&ctx,
 109                                        (const void *) r.base,
 110                                        (size_t) r.length));
 111                 CHECK(EVP_DigestFinal(&ctx, digest, NULL));
 112                 break;
 113 #endif
 114         default:
 115                 isc_sha256_init(&sha256);
 116                 dns_name_toregion(name, &r);
 117                 isc_sha256_update(&sha256, r.base, r.length);
 118                 dns_rdata_toregion(key, &r);
 119                 INSIST(r.length >= 4);
 120                 isc_sha256_update(&sha256, r.base, r.length);
 121                 isc_sha256_final(digest, &sha256);
 122                 break;
 123         }
 124
 125         ds.mctx = NULL;
 126         ds.common.rdclass = key->rdclass;
 127         ds.common.rdtype = dns_rdatatype_ds;
 128         ds.algorithm = r.base[3];
 129         ds.key_tag = dst_region_computeid(&r, ds.algorithm);
 130         ds.digest_type = digest_type;
 131         switch (digest_type) {
 132         case DNS_DSDIGEST_SHA1:
 133                 ds.length = ISC_SHA1_DIGESTLENGTH;
 134                 break;
 135 #ifdef HAVE_OPENSSL_GOST
 136         case DNS_DSDIGEST_GOST:
 137                 ds.length = ISC_GOST_DIGESTLENGTH;
 138                 break;
 139 #endif
 140         default:
 141                 ds.length = ISC_SHA256_DIGESTLENGTH;
 142                 break;
 143         }
 144         ds.digest = digest;
 145
 146         return (dns_rdata_fromstruct(rdata, key->rdclass, dns_rdatatype_ds,
 147                                      &ds, &b));
 148 }
 149
 150 isc_boolean_t
 151 dns_ds_digest_supported(unsigned int digest_type) {
 152 #ifdef HAVE_OPENSSL_GOST
 153         return  (ISC_TF(digest_type == DNS_DSDIGEST_SHA1 ||
 154                         digest_type == DNS_DSDIGEST_SHA256 ||
 155                         digest_type == DNS_DSDIGEST_GOST));
 156 #else
 157         return  (ISC_TF(digest_type == DNS_DSDIGEST_SHA1 ||
 158                         digest_type == DNS_DSDIGEST_SHA256));
 159 #endif
 160 }