crypto/ct/ct_x509v3.c

   1 /*
   2  * Copyright 2016-2021 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (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_local.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 {
  35     if (s != NULL) {
  36         int i;
  37
  38         for (i = 0; i < sk_SCT_num(s); i++) {
  39             int res = SCT_set_source(sk_SCT_value(s, i), source);
  40
  41             if (res != 1) {
  42                 return 0;
  43             }
  44         }
  45     }
  46     return 1;
  47 }
  48
  49 static STACK_OF(SCT) *x509_ext_d2i_SCT_LIST(STACK_OF(SCT) **a,
  50                                             const unsigned char **pp,
  51                                             long len)
  52 {
  53      STACK_OF(SCT) *s = d2i_SCT_LIST(a, pp, len);
  54
  55      if (set_sct_list_source(s, SCT_SOURCE_X509V3_EXTENSION) != 1) {
  56          SCT_LIST_free(s);
  57          *a = NULL;
  58          return NULL;
  59      }
  60      return s;
  61 }
  62
  63 static STACK_OF(SCT) *ocsp_ext_d2i_SCT_LIST(STACK_OF(SCT) **a,
  64                                             const unsigned char **pp,
  65                                             long len)
  66 {
  67     STACK_OF(SCT) *s = d2i_SCT_LIST(a, pp, len);
  68
  69     if (set_sct_list_source(s, SCT_SOURCE_OCSP_STAPLED_RESPONSE) != 1) {
  70         SCT_LIST_free(s);
  71         *a = NULL;
  72         return NULL;
  73     }
  74     return s;
  75 }
  76
  77 /* Handlers for X509v3/OCSP Certificate Transparency extensions */
  78 const X509V3_EXT_METHOD ossl_v3_ct_scts[3] = {
  79     /* X509v3 extension in certificates that contains SCTs */
  80     { NID_ct_precert_scts, 0, NULL,
  81     NULL, (X509V3_EXT_FREE)SCT_LIST_free,
  82     (X509V3_EXT_D2I)x509_ext_d2i_SCT_LIST, (X509V3_EXT_I2D)i2d_SCT_LIST,
  83     NULL, NULL,
  84     NULL, NULL,
  85     (X509V3_EXT_I2R)i2r_SCT_LIST, NULL,
  86     NULL },
  87
  88     /* X509v3 extension to mark a certificate as a pre-certificate */
  89     { NID_ct_precert_poison, 0, ASN1_ITEM_ref(ASN1_NULL),
  90     NULL, NULL, NULL, NULL,
  91     i2s_poison, s2i_poison,
  92     NULL, NULL,
  93     NULL, NULL,
  94     NULL },
  95
  96     /* OCSP extension that contains SCTs */
  97     { NID_ct_cert_scts, 0, NULL,
  98     0, (X509V3_EXT_FREE)SCT_LIST_free,
  99     (X509V3_EXT_D2I)ocsp_ext_d2i_SCT_LIST, (X509V3_EXT_I2D)i2d_SCT_LIST,
 100     NULL, NULL,
 101     NULL, NULL,
 102     (X509V3_EXT_I2R)i2r_SCT_LIST, NULL,
 103     NULL },
 104 };