crypto/ct/ct_x509v3.c

   1 /*
   2  * Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #ifdef OPENSSL_NO_CT
  11 # error "CT is disabled"
  12 #endif
  13
  14 #include "ct_locl.h"
  15
  16 static char *i2s_poison(const X509V3_EXT_METHOD *method, void *val)
  17 {
  18     return OPENSSL_strdup("NULL");
  19 }
  20
  21 static void *s2i_poison(const X509V3_EXT_METHOD *method, X509V3_CTX *ctx, const char *str)
  22 {
  23    return ASN1_NULL_new();
  24 }
  25
  26 static int i2r_SCT_LIST(X509V3_EXT_METHOD *method, STACK_OF(SCT) *sct_list,
  27                  BIO *out, int indent)
  28 {
  29     SCT_LIST_print(sct_list, out, indent, "\n", NULL);
  30     return 1;
  31 }
  32
  33 static int set_sct_list_source(STACK_OF(SCT) *s, sct_source_t source) {
  34     if (s != NULL) {
  35         size_t i;
  36         for (i = 0; i < sk_SCT_num(s); i++) {
  37             int res = SCT_set_source(
  38                 sk_SCT_value(s, i), SCT_SOURCE_X509V3_EXTENSION);
  39             if (res != 1) {
  40                 return 0;
  41             }
  42         }
  43     }
  44     return 1;
  45 }
  46
  47 static STACK_OF(SCT) *x509_ext_d2i_SCT_LIST(STACK_OF(SCT) **a,
  48                                             const unsigned char **pp,
  49                                             long len) {
  50      STACK_OF(SCT) *s = d2i_SCT_LIST(a, pp, len);
  51      if (set_sct_list_source(s, SCT_SOURCE_X509V3_EXTENSION) != 1) {
  52          SCT_LIST_free(s);
  53          *a = NULL;
  54          return NULL;
  55      }
  56      return s;
  57 }
  58
  59 static STACK_OF(SCT) *ocsp_ext_d2i_SCT_LIST(STACK_OF(SCT) **a,
  60                                             const unsigned char **pp,
  61                                             long len) {
  62     STACK_OF(SCT) *s = d2i_SCT_LIST(a, pp, len);
  63     if (set_sct_list_source(s, SCT_SOURCE_OCSP_STAPLED_RESPONSE) != 1) {
  64         SCT_LIST_free(s);
  65         *a = NULL;
  66         return NULL;
  67     }
  68     return s;
  69 }
  70
  71 /* Handlers for X509v3/OCSP Certificate Transparency extensions */
  72 const X509V3_EXT_METHOD v3_ct_scts[3] = {
  73     /* X509v3 extension in certificates that contains SCTs */
  74     { NID_ct_precert_scts, 0, NULL,
  75     NULL, (X509V3_EXT_FREE)SCT_LIST_free,
  76     (X509V3_EXT_D2I)x509_ext_d2i_SCT_LIST, (X509V3_EXT_I2D)i2d_SCT_LIST,
  77     NULL, NULL,
  78     NULL, NULL,
  79     (X509V3_EXT_I2R)i2r_SCT_LIST, NULL,
  80     NULL },
  81
  82     /* X509v3 extension to mark a certificate as a pre-certificate */
  83     { NID_ct_precert_poison, 0, ASN1_ITEM_ref(ASN1_NULL),
  84     NULL, NULL, NULL, NULL,
  85     i2s_poison, s2i_poison,
  86     NULL, NULL,
  87     NULL, NULL,
  88     NULL },
  89
  90     /* OCSP extension that contains SCTs */
  91     { NID_ct_cert_scts, 0, NULL,
  92     0, (X509V3_EXT_FREE)SCT_LIST_free,
  93     (X509V3_EXT_D2I)ocsp_ext_d2i_SCT_LIST, (X509V3_EXT_I2D)i2d_SCT_LIST,
  94     NULL, NULL,
  95     NULL, NULL,
  96     (X509V3_EXT_I2R)i2r_SCT_LIST, NULL,
  97     NULL },
  98 };