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 <openssl/bn.h>
  64 #include "../ssl/ssl_locl.h"
  65
  66 static int i2r_scts(X509V3_EXT_METHOD *method, ASN1_OCTET_STRING *oct, BIO *out, int indent);
  67
  68 const X509V3_EXT_METHOD v3_ct_scts[] = {
  69 { NID_ct_precert_scts, 0, ASN1_ITEM_ref(ASN1_OCTET_STRING),
  70 0,0,0,0,
  71 0,0,0,0,
  72 (X509V3_EXT_I2R)i2r_scts, NULL,
  73 NULL},
  74
  75 { NID_ct_cert_scts, 0, ASN1_ITEM_ref(ASN1_OCTET_STRING),
  76 0,0,0,0,
  77 0,0,0,0,
  78 (X509V3_EXT_I2R)i2r_scts, NULL,
  79 NULL},
  80 };
  81
  82 static void tls12_signature_print(BIO *out, const unsigned char *data)
  83         {
  84         int nid = NID_undef;
  85         /* RFC6962 only permits two signature algorithms */
  86         if (data[0] == TLSEXT_hash_sha256)
  87                 {
  88                 if (data[1] == TLSEXT_signature_rsa)
  89                         nid = NID_sha256WithRSAEncryption;
  90                 else if (data[1] == TLSEXT_signature_ecdsa)
  91                         nid = NID_ecdsa_with_SHA256;
  92                 }
  93         if (nid == NID_undef)
  94                 BIO_printf(out, "%02X%02X", data[0], data[1]);
  95         else
  96                 BIO_printf(out, "%s", OBJ_nid2ln(nid));
  97         }
  98
  99 static void timestamp_print(BIO *out, BN_ULLONG timestamp)
 100         {
 101         ASN1_GENERALIZEDTIME *gen;
 102         char genstr[20];
 103         gen = ASN1_GENERALIZEDTIME_new();
 104         ASN1_GENERALIZEDTIME_adj(gen, (time_t)0,
 105                                         timestamp / 86400000,
 106                                         (timestamp % 86400000) / 1000);
 107         /* Note GeneralizedTime from ASN1_GENERALIZETIME_adj is always 15
 108          * characters long with a final Z. Update it with fractional seconds.
 109          */
 110         BIO_snprintf(genstr, sizeof(genstr), "%.14s.%03dZ",
 111                                 ASN1_STRING_data(gen),
 112                                 (unsigned int)(timestamp % 1000));
 113         ASN1_GENERALIZEDTIME_set_string(gen, genstr);
 114         ASN1_GENERALIZEDTIME_print(out, gen);
 115         ASN1_GENERALIZEDTIME_free(gen);
 116         }
 117
 118 static int i2r_scts(X509V3_EXT_METHOD *method, ASN1_OCTET_STRING *oct,
 119                        BIO *out, int indent)
 120         {
 121         BN_ULLONG timestamp;
 122         unsigned char* data = oct->data;
 123         unsigned short listlen, sctlen = 0, fieldlen;
 124
 125         if (oct->length < 2)
 126                 return 0;
 127         n2s(data, listlen);
 128         if (listlen != oct->length - 2)
 129                 return 0;
 130
 131         while (listlen > 0)
 132                 {
 133                 if (listlen < 2)
 134                         return 0;
 135                 n2s(data, sctlen);
 136                 listlen -= 2;
 137
 138                 if ((sctlen < 1) || (sctlen > listlen))
 139                         return 0;
 140                 listlen -= sctlen;
 141
 142                 BIO_printf(out, "%*sSigned Certificate Timestamp:", indent,
 143                            "");
 144
 145                 if (*data == 0)         /* SCT v1 */
 146                         {
 147                         /* Fixed-length header:
 148                          *              struct {
 149                          * (1 byte)       Version sct_version;
 150                          * (32 bytes)     LogID id;
 151                          * (8 bytes)      uint64 timestamp;
 152                          * (2 bytes + ?)  CtExtensions extensions;
 153                          */
 154                         if (sctlen < 43)
 155                                 return 0;
 156                         sctlen -= 43;
 157
 158                         BIO_printf(out, "\n%*sVersion   : v1(0)", indent + 4,
 159                                    "");
 160
 161                         BIO_printf(out, "\n%*sLog ID    : ", indent + 4, "");
 162                         BIO_hex_string(out, indent + 16, 16, data + 1, 32);
 163
 164                         data += 33;
 165                         n2l8(data, timestamp);
 166                         BIO_printf(out, "\n%*sTimestamp : ", indent + 4, "");
 167                         timestamp_print(out, timestamp);
 168
 169                         n2s(data, fieldlen);
 170                         if (sctlen < fieldlen)
 171                                 return 0;
 172                         sctlen -= fieldlen;
 173                         BIO_printf(out, "\n%*sExtensions: ", indent + 4, "");
 174                         if (fieldlen == 0)
 175                                 BIO_printf(out, "none");
 176                         else
 177                                 BIO_hex_string(out, indent + 16, 16, data,
 178                                                fieldlen);
 179                         data += fieldlen;
 180
 181                         /* digitally-signed struct header:
 182                          * (1 byte) Hash algorithm
 183                          * (1 byte) Signature algorithm
 184                          * (2 bytes + ?) Signature
 185                          */
 186                         if (sctlen < 4)
 187                                 return 0;
 188                         sctlen -= 4;
 189
 190                         BIO_printf(out, "\n%*sSignature : ", indent + 4, "");
 191                         tls12_signature_print(out, data);
 192                         data += 2;
 193                         n2s(data, fieldlen);
 194                         if (sctlen != fieldlen)
 195                                 return 0;
 196                         BIO_printf(out, "\n%*s            ", indent + 4, "");
 197                         BIO_hex_string(out, indent + 16, 16, data, fieldlen);
 198                         if (listlen > 0) BIO_printf(out, "\n");
 199                         data += fieldlen;
 200                         }
 201                 }
 202
 203         return 1;
 204         }