crypto/x509/v3_tlsf.c

   1 /*
   2  * Copyright 2015-2018 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 #include "e_os.h"
  11 #include "internal/cryptlib.h"
  12 #include <stdio.h>
  13 #include <openssl/asn1t.h>
  14 #include <openssl/conf.h>
  15 #include <openssl/x509v3.h>
  16 #include "ext_dat.h"
  17
  18 DEFINE_STACK_OF(ASN1_INTEGER)
  19 DEFINE_STACK_OF(CONF_VALUE)
  20
  21 static STACK_OF(CONF_VALUE) *i2v_TLS_FEATURE(const X509V3_EXT_METHOD *method,
  22                                              TLS_FEATURE *tls_feature,
  23                                              STACK_OF(CONF_VALUE) *ext_list);
  24 static TLS_FEATURE *v2i_TLS_FEATURE(const X509V3_EXT_METHOD *method,
  25                                     X509V3_CTX *ctx,
  26                                     STACK_OF(CONF_VALUE) *nval);
  27
  28 ASN1_ITEM_TEMPLATE(TLS_FEATURE) =
  29         ASN1_EX_TEMPLATE_TYPE(ASN1_TFLG_SEQUENCE_OF, 0, TLS_FEATURE, ASN1_INTEGER)
  30 static_ASN1_ITEM_TEMPLATE_END(TLS_FEATURE)
  31
  32 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(TLS_FEATURE)
  33
  34 const X509V3_EXT_METHOD v3_tls_feature = {
  35     NID_tlsfeature, 0,
  36     ASN1_ITEM_ref(TLS_FEATURE),
  37     0, 0, 0, 0,
  38     0, 0,
  39     (X509V3_EXT_I2V)i2v_TLS_FEATURE,
  40     (X509V3_EXT_V2I)v2i_TLS_FEATURE,
  41     0, 0,
  42     NULL
  43 };
  44
  45
  46 typedef struct {
  47     long num;
  48     const char *name;
  49 } TLS_FEATURE_NAME;
  50
  51 static TLS_FEATURE_NAME tls_feature_tbl[] = {
  52     { 5, "status_request" },
  53     { 17, "status_request_v2" }
  54 };
  55
  56 /*
  57  * i2v_TLS_FEATURE converts the TLS_FEATURE structure tls_feature into the
  58  * STACK_OF(CONF_VALUE) structure ext_list. STACK_OF(CONF_VALUE) is the format
  59  * used by the CONF library to represent a multi-valued extension.  ext_list is
  60  * returned.
  61  */
  62 static STACK_OF(CONF_VALUE) *i2v_TLS_FEATURE(const X509V3_EXT_METHOD *method,
  63                                              TLS_FEATURE *tls_feature,
  64                                              STACK_OF(CONF_VALUE) *ext_list)
  65 {
  66     int i;
  67     size_t j;
  68     ASN1_INTEGER *ai;
  69     long tlsextid;
  70     for (i = 0; i < sk_ASN1_INTEGER_num(tls_feature); i++) {
  71         ai = sk_ASN1_INTEGER_value(tls_feature, i);
  72         tlsextid = ASN1_INTEGER_get(ai);
  73         for (j = 0; j < OSSL_NELEM(tls_feature_tbl); j++)
  74             if (tlsextid == tls_feature_tbl[j].num)
  75                 break;
  76         if (j < OSSL_NELEM(tls_feature_tbl))
  77             X509V3_add_value(NULL, tls_feature_tbl[j].name, &ext_list);
  78         else
  79             X509V3_add_value_int(NULL, ai, &ext_list);
  80     }
  81     return ext_list;
  82 }
  83
  84 /*
  85  * v2i_TLS_FEATURE converts the multi-valued extension nval into a TLS_FEATURE
  86  * structure, which is returned if the conversion is successful.  In case of
  87  * error, NULL is returned.
  88  */
  89 static TLS_FEATURE *v2i_TLS_FEATURE(const X509V3_EXT_METHOD *method,
  90                                     X509V3_CTX *ctx, STACK_OF(CONF_VALUE) *nval)
  91 {
  92     TLS_FEATURE *tlsf;
  93     char *extval, *endptr;
  94     ASN1_INTEGER *ai;
  95     CONF_VALUE *val;
  96     int i;
  97     size_t j;
  98     long tlsextid;
  99
 100     if ((tlsf = sk_ASN1_INTEGER_new_null()) == NULL) {
 101         X509V3err(X509V3_F_V2I_TLS_FEATURE, ERR_R_MALLOC_FAILURE);
 102         return NULL;
 103     }
 104
 105     for (i = 0; i < sk_CONF_VALUE_num(nval); i++) {
 106         val = sk_CONF_VALUE_value(nval, i);
 107         if (val->value)
 108             extval = val->value;
 109         else
 110             extval = val->name;
 111
 112         for (j = 0; j < OSSL_NELEM(tls_feature_tbl); j++)
 113             if (strcasecmp(extval, tls_feature_tbl[j].name) == 0)
 114                 break;
 115         if (j < OSSL_NELEM(tls_feature_tbl))
 116             tlsextid = tls_feature_tbl[j].num;
 117         else {
 118             tlsextid = strtol(extval, &endptr, 10);
 119             if (((*endptr) != '\0') || (extval == endptr) || (tlsextid < 0) ||
 120                 (tlsextid > 65535)) {
 121                 X509V3err(X509V3_F_V2I_TLS_FEATURE, X509V3_R_INVALID_SYNTAX);
 122                 X509V3_conf_err(val);
 123                 goto err;
 124             }
 125         }
 126
 127         if ((ai = ASN1_INTEGER_new()) == NULL
 128                 || !ASN1_INTEGER_set(ai, tlsextid)
 129                 || sk_ASN1_INTEGER_push(tlsf, ai) <= 0) {
 130             X509V3err(X509V3_F_V2I_TLS_FEATURE, ERR_R_MALLOC_FAILURE);
 131             goto err;
 132         }
 133     }
 134     return tlsf;
 135
 136  err:
 137     sk_ASN1_INTEGER_pop_free(tlsf, ASN1_INTEGER_free);
 138     return NULL;
 139 }