crypto/x509v3/v3_scts.c

   1 /* v3_scts.c */
   2 /* Written by Rob Stradling (rob@comodo.com) for the OpenSSL project 2014.
   3  */
   4 /* ====================================================================
   5  * Copyright (c) 2014 The OpenSSL Project.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  *
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in
  16  *    the documentation and/or other materials provided with the
  17  *    distribution.
  18  *
  19  * 3. All advertising materials mentioning features or use of this
  20  *    software must display the following acknowledgment:
  21  *    "This product includes software developed by the OpenSSL Project
  22  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  23  *
  24  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  25  *    endorse or promote products derived from this software without
  26  *    prior written permission. For written permission, please contact
  27  *    licensing@OpenSSL.org.
  28  *
  29  * 5. Products derived from this software may not be called "OpenSSL"
  30  *    nor may "OpenSSL" appear in their names without prior written
  31  *    permission of the OpenSSL Project.
  32  *
  33  * 6. Redistributions of any form whatsoever must retain the following
  34  *    acknowledgment:
  35  *    "This product includes software developed by the OpenSSL Project
  36  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  37  *
  38  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  39  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  40  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  41  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  42  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  43  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  44  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  45  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  46  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  47  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  48  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  49  * OF THE POSSIBILITY OF SUCH DAMAGE.
  50  * ====================================================================
  51  *
  52  * This product includes cryptographic software written by Eric Young
  53  * (eay@cryptsoft.com).  This product includes software written by Tim
  54  * Hudson (tjh@cryptsoft.com).
  55  *
  56  */
  57
  58
  59 #include <stdio.h>
  60 #include "cryptlib.h"
  61 #include <openssl/asn1.h>
  62 #include <openssl/x509v3.h>
  63 #include "../ssl/ssl_locl.h"
  64
  65 #if (defined(_WIN32) || defined(_WIN64)) && !defined(__MINGW32__)
  66 #define SCT_TIMESTAMP unsigned __int64
  67 #elif defined(__arch64__)
  68 #define SCT_TIMESTAMP unsigned long
  69 #else
  70 #define SCT_TIMESTAMP unsigned long long
  71 #endif
  72
  73 #define n2l8(c,l)       (l =((SCT_TIMESTAMP)(*((c)++)))<<56, \
  74                          l|=((SCT_TIMESTAMP)(*((c)++)))<<48, \
  75                          l|=((SCT_TIMESTAMP)(*((c)++)))<<40, \
  76                          l|=((SCT_TIMESTAMP)(*((c)++)))<<32, \
  77                          l|=((SCT_TIMESTAMP)(*((c)++)))<<24, \
  78                          l|=((SCT_TIMESTAMP)(*((c)++)))<<16, \
  79                          l|=((SCT_TIMESTAMP)(*((c)++)))<< 8, \
  80                          l|=((SCT_TIMESTAMP)(*((c)++))))
  81
  82 typedef struct SCT_st {
  83         /* The encoded SCT */
  84         unsigned char *sct;
  85         unsigned short sctlen;
  86
  87         /* Components of the SCT.  "logid", "ext" and "sig" point to addresses
  88          * inside "sct".
  89          */
  90         unsigned char version;
  91         unsigned char* logid;
  92         unsigned short logidlen;
  93         SCT_TIMESTAMP timestamp;
  94         unsigned char *ext;
  95         unsigned short extlen;
  96         unsigned char hash_alg;
  97         unsigned char sig_alg;
  98         unsigned char *sig;
  99         unsigned short siglen;
 100 } SCT;
 101
 102 DECLARE_STACK_OF(SCT)
 103
 104 static void SCT_LIST_free(STACK_OF(SCT) *a);
 105 static STACK_OF(SCT) *d2i_SCT_LIST(STACK_OF(SCT) **a, const unsigned char **pp,
 106                                    long length);
 107 static int i2r_SCT_LIST(X509V3_EXT_METHOD *method, STACK_OF(SCT) *sct_list,
 108                         BIO *out, int indent);
 109
 110 const X509V3_EXT_METHOD v3_ct_scts[] = {
 111 { NID_ct_precert_scts, 0, NULL,
 112 0,(X509V3_EXT_FREE)SCT_LIST_free,
 113 (X509V3_EXT_D2I)d2i_SCT_LIST, 0,
 114 0,0,0,0,
 115 (X509V3_EXT_I2R)i2r_SCT_LIST, 0,
 116 NULL},
 117
 118 { NID_ct_cert_scts, 0, NULL,
 119 0,(X509V3_EXT_FREE)SCT_LIST_free,
 120 (X509V3_EXT_D2I)d2i_SCT_LIST, 0,
 121 0,0,0,0,
 122 (X509V3_EXT_I2R)i2r_SCT_LIST, 0,
 123 NULL},
 124 };
 125
 126 static void tls12_signature_print(BIO *out, const unsigned char hash_alg,
 127                                   const unsigned char sig_alg)
 128         {
 129         int nid = NID_undef;
 130         /* RFC6962 only permits two signature algorithms */
 131         if (hash_alg == TLSEXT_hash_sha256)
 132                 {
 133                 if (sig_alg == TLSEXT_signature_rsa)
 134                         nid = NID_sha256WithRSAEncryption;
 135                 else if (sig_alg == TLSEXT_signature_ecdsa)
 136                         nid = NID_ecdsa_with_SHA256;
 137                 }
 138         if (nid == NID_undef)
 139                 BIO_printf(out, "%02X%02X", hash_alg, sig_alg);
 140         else
 141                 BIO_printf(out, "%s", OBJ_nid2ln(nid));
 142         }
 143
 144 static void timestamp_print(BIO *out, SCT_TIMESTAMP timestamp)
 145         {
 146         ASN1_GENERALIZEDTIME *gen;
 147         char genstr[20];
 148         gen = ASN1_GENERALIZEDTIME_new();
 149         ASN1_GENERALIZEDTIME_adj(gen, (time_t)0,
 150                                         (int)(timestamp / 86400000),
 151                                         (timestamp % 86400000) / 1000);
 152         /* Note GeneralizedTime from ASN1_GENERALIZETIME_adj is always 15
 153          * characters long with a final Z. Update it with fractional seconds.
 154          */
 155         BIO_snprintf(genstr, sizeof(genstr), "%.14s.%03dZ",
 156                                 ASN1_STRING_data(gen),
 157                                 (unsigned int)(timestamp % 1000));
 158         ASN1_GENERALIZEDTIME_set_string(gen, genstr);
 159         ASN1_GENERALIZEDTIME_print(out, gen);
 160         ASN1_GENERALIZEDTIME_free(gen);
 161         }
 162
 163 static void SCT_free(SCT *sct)
 164         {
 165         if (sct)
 166                 {
 167                 if (sct->sct) OPENSSL_free(sct->sct);
 168                 OPENSSL_free(sct);
 169                 }
 170         }
 171
 172 static void SCT_LIST_free(STACK_OF(SCT) *a)
 173         {
 174         sk_SCT_pop_free(a, SCT_free);
 175         }
 176
 177 static STACK_OF(SCT) *d2i_SCT_LIST(STACK_OF(SCT) **a, const unsigned char **pp,
 178                                    long length)
 179         {
 180         ASN1_OCTET_STRING *oct = NULL;
 181         STACK_OF(SCT) *sk = NULL;
 182         SCT *sct;
 183         unsigned char *p, *p2;
 184         unsigned short listlen, sctlen = 0, fieldlen;
 185
 186         if (d2i_ASN1_OCTET_STRING(&oct, pp, length) == NULL)
 187                 return NULL;
 188         if (oct->length < 2)
 189                 goto done;
 190         p = oct->data;
 191         n2s(p, listlen);
 192         if (listlen != oct->length - 2)
 193                 goto done;
 194
 195         if ((sk=sk_SCT_new_null()) == NULL)
 196                 goto done;
 197
 198         while (listlen > 0)
 199                 {
 200                 if (listlen < 2)
 201                         goto err;
 202                 n2s(p, sctlen);
 203                 listlen -= 2;
 204
 205                 if ((sctlen < 1) || (sctlen > listlen))
 206                         goto err;
 207                 listlen -= sctlen;
 208
 209                 sct = OPENSSL_malloc(sizeof(SCT));
 210                 if (!sct)
 211                         goto err;
 212                 if (!sk_SCT_push(sk, sct))
 213                         {
 214                         OPENSSL_free(sct);
 215                         goto err;
 216                         }
 217
 218                 sct->sct = OPENSSL_malloc(sctlen);
 219                 if (!sct->sct)
 220                         goto err;
 221                 memcpy(sct->sct, p, sctlen);
 222                 sct->sctlen = sctlen;
 223                 p += sctlen;
 224                 p2 = sct->sct;
 225
 226                 sct->version = *p2++;
 227                 if (sct->version == 0)          /* SCT v1 */
 228                         {
 229                         /* Fixed-length header:
 230                          *              struct {
 231                          * (1 byte)       Version sct_version;
 232                          * (32 bytes)     LogID id;
 233                          * (8 bytes)      uint64 timestamp;
 234                          * (2 bytes + ?)  CtExtensions extensions;
 235                          */
 236                         if (sctlen < 43)
 237                                 goto err;
 238                         sctlen -= 43;
 239
 240                         sct->logid = p2;
 241                         sct->logidlen = 32;
 242                         p2 += 32;
 243
 244                         n2l8(p2, sct->timestamp);
 245
 246                         n2s(p2, fieldlen);
 247                         if (sctlen < fieldlen)
 248                                 goto err;
 249                         sct->ext = p2;
 250                         sct->extlen = fieldlen;
 251                         p2 += fieldlen;
 252                         sctlen -= fieldlen;
 253
 254                         /* digitally-signed struct header:
 255                          * (1 byte)       Hash algorithm
 256                          * (1 byte)       Signature algorithm
 257                          * (2 bytes + ?)  Signature
 258                          */
 259                         if (sctlen < 4)
 260                                 goto err;
 261                         sctlen -= 4;
 262
 263                         sct->hash_alg = *p2++;
 264                         sct->sig_alg = *p2++;
 265                         n2s(p2, fieldlen);
 266                         if (sctlen != fieldlen)
 267                                 goto err;
 268                         sct->sig = p2;
 269                         sct->siglen = fieldlen;
 270                         }
 271                 }
 272
 273         done:
 274         ASN1_OCTET_STRING_free(oct);
 275         return sk;
 276
 277         err:
 278         SCT_LIST_free(sk);
 279         sk = NULL;
 280         goto done;
 281         }
 282
 283 static int i2r_SCT_LIST(X509V3_EXT_METHOD *method, STACK_OF(SCT) *sct_list,
 284                         BIO *out, int indent)
 285         {
 286         SCT *sct;
 287         int i;
 288
 289         for (i = 0; i < sk_SCT_num(sct_list);) {
 290                 sct = sk_SCT_value(sct_list, i);
 291
 292                 BIO_printf(out, "%*sSigned Certificate Timestamp:", indent, "");
 293                 BIO_printf(out, "\n%*sVersion   : ", indent + 4, "");
 294
 295                 if (sct->version == 0)  /* SCT v1 */
 296                         {
 297                         BIO_printf(out, "v1(0)");
 298
 299                         BIO_printf(out, "\n%*sLog ID    : ", indent + 4, "");
 300                         BIO_hex_string(out, indent + 16, 16, sct->logid,
 301                                        sct->logidlen);
 302
 303                         BIO_printf(out, "\n%*sTimestamp : ", indent + 4, "");
 304                         timestamp_print(out, sct->timestamp);
 305
 306                         BIO_printf(out, "\n%*sExtensions: ", indent + 4, "");
 307                         if (sct->extlen == 0)
 308                                 BIO_printf(out, "none");
 309                         else
 310                                 BIO_hex_string(out, indent + 16, 16, sct->ext,
 311                                                sct->extlen);
 312
 313                         BIO_printf(out, "\n%*sSignature : ", indent + 4, "");
 314                         tls12_signature_print(out, sct->hash_alg, sct->sig_alg);
 315                         BIO_printf(out, "\n%*s            ", indent + 4, "");
 316                         BIO_hex_string(out, indent + 16, 16, sct->sig,
 317                                        sct->siglen);
 318                         }
 319                 else                    /* Unknown version */
 320                         {
 321                         BIO_printf(out, "unknown\n%*s", indent + 16, "");
 322                         BIO_hex_string(out, indent + 16, 16, sct->sct,
 323                                        sct->sctlen);
 324                         }
 325
 326                 if (++i < sk_SCT_num(sct_list)) BIO_printf(out, "\n");
 327                 }
 328
 329         return 1;
 330         }