crypto/x509v3/v3_tlsf.c

   1 /*
   2  * Copyright 2015-2016 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 #include <stdio.h>
  11 #include "internal/cryptlib.h"
  12 #include "internal/o_str.h"
  13 #include <openssl/asn1t.h>
  14 #include <openssl/conf.h>
  15 #include <openssl/x509v3.h>
  16 #include "ext_dat.h"
  17
  18 static STACK_OF(CONF_VALUE) *i2v_TLS_FEATURE(const X509V3_EXT_METHOD *method,
  19                                              TLS_FEATURE *tls_feature,
  20                                              STACK_OF(CONF_VALUE) *ext_list);
  21 static TLS_FEATURE *v2i_TLS_FEATURE(const X509V3_EXT_METHOD *method,
  22                                     X509V3_CTX *ctx,
  23                                     STACK_OF(CONF_VALUE) *nval);
  24
  25 ASN1_ITEM_TEMPLATE(TLS_FEATURE) =
  26         ASN1_EX_TEMPLATE_TYPE(ASN1_TFLG_SEQUENCE_OF, 0, TLS_FEATURE, ASN1_INTEGER)
  27 static_ASN1_ITEM_TEMPLATE_END(TLS_FEATURE)
  28
  29 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(TLS_FEATURE)
  30
  31 const X509V3_EXT_METHOD v3_tls_feature = {
  32     NID_tlsfeature, 0,
  33     ASN1_ITEM_ref(TLS_FEATURE),
  34     0, 0, 0, 0,
  35     0, 0,
  36     (X509V3_EXT_I2V)i2v_TLS_FEATURE,
  37     (X509V3_EXT_V2I)v2i_TLS_FEATURE,
  38     0, 0,
  39     NULL
  40 };
  41
  42
  43 typedef struct {
  44     long num;
  45     const char *name;
  46 } TLS_FEATURE_NAME;
  47
  48 static TLS_FEATURE_NAME tls_feature_tbl[] = {
  49     { 5, "status_request" },
  50     { 17, "status_request_v2" }
  51 };
  52
  53 /*
  54  * i2v_TLS_FEATURE converts the TLS_FEATURE structure tls_feature into the
  55  * STACK_OF(CONF_VALUE) structure ext_list. STACK_OF(CONF_VALUE) is the format
  56  * used by the CONF library to represent a multi-valued extension.  ext_list is
  57  * returned.
  58  */
  59 static STACK_OF(CONF_VALUE) *i2v_TLS_FEATURE(const X509V3_EXT_METHOD *method,
  60                                              TLS_FEATURE *tls_feature,
  61                                              STACK_OF(CONF_VALUE) *ext_list)
  62 {
  63     int i;
  64     size_t j;
  65     ASN1_INTEGER *ai;
  66     long tlsextid;
  67     for (i = 0; i < sk_ASN1_INTEGER_num(tls_feature); i++) {
  68         ai = sk_ASN1_INTEGER_value(tls_feature, i);
  69         tlsextid = ASN1_INTEGER_get(ai);
  70         for (j = 0; j < OSSL_NELEM(tls_feature_tbl); j++)
  71             if (tlsextid == tls_feature_tbl[j].num)
  72                 break;
  73         if (j < OSSL_NELEM(tls_feature_tbl))
  74             X509V3_add_value(NULL, tls_feature_tbl[j].name, &ext_list);
  75         else
  76             X509V3_add_value_int(NULL, ai, &ext_list);
  77     }
  78     return ext_list;
  79 }
  80
  81 /*
  82  * v2i_TLS_FEATURE converts the multi-valued extension nval into a TLS_FEATURE
  83  * structure, which is returned if the conversion is successful.  In case of
  84  * error, NULL is returned.
  85  */
  86 static TLS_FEATURE *v2i_TLS_FEATURE(const X509V3_EXT_METHOD *method,
  87                                     X509V3_CTX *ctx, STACK_OF(CONF_VALUE) *nval)
  88 {
  89     TLS_FEATURE *tlsf;
  90     char *extval, *endptr;
  91     ASN1_INTEGER *ai;
  92     CONF_VALUE *val;
  93     int i;
  94     size_t j;
  95     long tlsextid;
  96
  97     if ((tlsf = sk_ASN1_INTEGER_new_null()) == NULL) {
  98         X509V3err(X509V3_F_V2I_TLS_FEATURE, ERR_R_MALLOC_FAILURE);
  99         return NULL;
 100     }
 101
 102     for (i = 0; i < sk_CONF_VALUE_num(nval); i++) {
 103         val = sk_CONF_VALUE_value(nval, i);
 104         if (val->value)
 105             extval = val->value;
 106         else
 107             extval = val->name;
 108
 109         for (j = 0; j < OSSL_NELEM(tls_feature_tbl); j++)
 110             if (OPENSSL_strcasecmp(extval, tls_feature_tbl[j].name) == 0)
 111                 break;
 112         if (j < OSSL_NELEM(tls_feature_tbl))
 113             tlsextid = tls_feature_tbl[j].num;
 114         else {
 115             tlsextid = strtol(extval, &endptr, 10);
 116             if (((*endptr) != '\0') || (extval == endptr) || (tlsextid < 0) ||
 117                 (tlsextid > 65535)) {
 118                 X509V3err(X509V3_F_V2I_TLS_FEATURE, X509V3_R_INVALID_SYNTAX);
 119                 X509V3_conf_err(val);
 120                 goto err;
 121             }
 122         }
 123
 124         ai = ASN1_INTEGER_new();
 125         if (ai == NULL) {
 126             X509V3err(X509V3_F_V2I_TLS_FEATURE, ERR_R_MALLOC_FAILURE);
 127             goto err;
 128         }
 129         ASN1_INTEGER_set(ai, tlsextid);
 130         sk_ASN1_INTEGER_push(tlsf, ai);
 131     }
 132     return tlsf;
 133
 134  err:
 135     sk_ASN1_INTEGER_pop_free(tlsf, ASN1_INTEGER_free);
 136     return NULL;
 137 }