crypto/x509/v3_tlsf.c

   1 /*
   2  * Copyright 2015-2020 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 #include "x509_local.h"
  18
  19 static STACK_OF(CONF_VALUE) *i2v_TLS_FEATURE(const X509V3_EXT_METHOD *method,
  20                                              TLS_FEATURE *tls_feature,
  21                                              STACK_OF(CONF_VALUE) *ext_list);
  22 static TLS_FEATURE *v2i_TLS_FEATURE(const X509V3_EXT_METHOD *method,
  23                                     X509V3_CTX *ctx,
  24                                     STACK_OF(CONF_VALUE) *nval);
  25
  26 ASN1_ITEM_TEMPLATE(TLS_FEATURE) =
  27         ASN1_EX_TEMPLATE_TYPE(ASN1_TFLG_SEQUENCE_OF, 0, TLS_FEATURE, ASN1_INTEGER)
  28 static_ASN1_ITEM_TEMPLATE_END(TLS_FEATURE)
  29
  30 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(TLS_FEATURE)
  31
  32 const X509V3_EXT_METHOD v3_tls_feature = {
  33     NID_tlsfeature, 0,
  34     ASN1_ITEM_ref(TLS_FEATURE),
  35     0, 0, 0, 0,
  36     0, 0,
  37     (X509V3_EXT_I2V)i2v_TLS_FEATURE,
  38     (X509V3_EXT_V2I)v2i_TLS_FEATURE,
  39     0, 0,
  40     NULL
  41 };
  42
  43
  44 typedef struct {
  45     long num;
  46     const char *name;
  47 } TLS_FEATURE_NAME;
  48
  49 static TLS_FEATURE_NAME tls_feature_tbl[] = {
  50     { 5, "status_request" },
  51     { 17, "status_request_v2" }
  52 };
  53
  54 /*
  55  * i2v_TLS_FEATURE converts the TLS_FEATURE structure tls_feature into the
  56  * STACK_OF(CONF_VALUE) structure ext_list. STACK_OF(CONF_VALUE) is the format
  57  * used by the CONF library to represent a multi-valued extension.  ext_list is
  58  * returned.
  59  */
  60 static STACK_OF(CONF_VALUE) *i2v_TLS_FEATURE(const X509V3_EXT_METHOD *method,
  61                                              TLS_FEATURE *tls_feature,
  62                                              STACK_OF(CONF_VALUE) *ext_list)
  63 {
  64     int i;
  65     size_t j;
  66     ASN1_INTEGER *ai;
  67     long tlsextid;
  68     for (i = 0; i < sk_ASN1_INTEGER_num(tls_feature); i++) {
  69         ai = sk_ASN1_INTEGER_value(tls_feature, i);
  70         tlsextid = ASN1_INTEGER_get(ai);
  71         for (j = 0; j < OSSL_NELEM(tls_feature_tbl); j++)
  72             if (tlsextid == tls_feature_tbl[j].num)
  73                 break;
  74         if (j < OSSL_NELEM(tls_feature_tbl))
  75             X509V3_add_value(NULL, tls_feature_tbl[j].name, &ext_list);
  76         else
  77             X509V3_add_value_int(NULL, ai, &ext_list);
  78     }
  79     return ext_list;
  80 }
  81
  82 /*
  83  * v2i_TLS_FEATURE converts the multi-valued extension nval into a TLS_FEATURE
  84  * structure, which is returned if the conversion is successful.  In case of
  85  * error, NULL is returned.
  86  */
  87 static TLS_FEATURE *v2i_TLS_FEATURE(const X509V3_EXT_METHOD *method,
  88                                     X509V3_CTX *ctx, STACK_OF(CONF_VALUE) *nval)
  89 {
  90     TLS_FEATURE *tlsf;
  91     char *extval, *endptr;
  92     ASN1_INTEGER *ai = NULL;
  93     CONF_VALUE *val;
  94     int i;
  95     size_t j;
  96     long tlsextid;
  97
  98     if ((tlsf = sk_ASN1_INTEGER_new_null()) == NULL) {
  99         X509V3err(X509V3_F_V2I_TLS_FEATURE, ERR_R_MALLOC_FAILURE);
 100         return NULL;
 101     }
 102
 103     for (i = 0; i < sk_CONF_VALUE_num(nval); i++) {
 104         val = sk_CONF_VALUE_value(nval, i);
 105         if (val->value)
 106             extval = val->value;
 107         else
 108             extval = val->name;
 109
 110         for (j = 0; j < OSSL_NELEM(tls_feature_tbl); j++)
 111             if (strcasecmp(extval, tls_feature_tbl[j].name) == 0)
 112                 break;
 113         if (j < OSSL_NELEM(tls_feature_tbl))
 114             tlsextid = tls_feature_tbl[j].num;
 115         else {
 116             tlsextid = strtol(extval, &endptr, 10);
 117             if (((*endptr) != '\0') || (extval == endptr) || (tlsextid < 0) ||
 118                 (tlsextid > 65535)) {
 119                 X509V3err(X509V3_F_V2I_TLS_FEATURE, X509V3_R_INVALID_SYNTAX);
 120                 X509V3_conf_add_error_name_value(val);
 121                 goto err;
 122             }
 123         }
 124
 125         if ((ai = ASN1_INTEGER_new()) == NULL
 126                 || !ASN1_INTEGER_set(ai, tlsextid)
 127                 || sk_ASN1_INTEGER_push(tlsf, ai) <= 0) {
 128             X509V3err(X509V3_F_V2I_TLS_FEATURE, ERR_R_MALLOC_FAILURE);
 129             goto err;
 130         }
 131         /* So it doesn't get purged if an error occurs next time around */
 132         ai = NULL;
 133     }
 134     return tlsf;
 135
 136  err:
 137     sk_ASN1_INTEGER_pop_free(tlsf, ASN1_INTEGER_free);
 138     ASN1_INTEGER_free(ai);
 139     return NULL;
 140 }