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      1 /*
      2  * Copyright 2015-2022 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 "internal/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) = 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 ossl_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 typedef struct {
     43     long num;
     44     const char *name;
     45 } TLS_FEATURE_NAME;
     46 
     47 static TLS_FEATURE_NAME tls_feature_tbl[] = {
     48     { 5, "status_request" },
     49     { 17, "status_request_v2" }
     50 };
     51 
     52 /*
     53  * i2v_TLS_FEATURE converts the TLS_FEATURE structure tls_feature into the
     54  * STACK_OF(CONF_VALUE) structure ext_list. STACK_OF(CONF_VALUE) is the format
     55  * used by the CONF library to represent a multi-valued extension.  ext_list is
     56  * returned.
     57  */
     58 static STACK_OF(CONF_VALUE) *i2v_TLS_FEATURE(const X509V3_EXT_METHOD *method,
     59     TLS_FEATURE *tls_feature,
     60     STACK_OF(CONF_VALUE) *ext_list)
     61 {
     62     int i;
     63     size_t j;
     64     ASN1_INTEGER *ai;
     65     long tlsextid;
     66     for (i = 0; i < sk_ASN1_INTEGER_num(tls_feature); i++) {
     67         ai = sk_ASN1_INTEGER_value(tls_feature, i);
     68         tlsextid = ASN1_INTEGER_get(ai);
     69         for (j = 0; j < OSSL_NELEM(tls_feature_tbl); j++)
     70             if (tlsextid == tls_feature_tbl[j].num)
     71                 break;
     72         if (j < OSSL_NELEM(tls_feature_tbl))
     73             X509V3_add_value(NULL, tls_feature_tbl[j].name, &ext_list);
     74         else
     75             X509V3_add_value_int(NULL, ai, &ext_list);
     76     }
     77     return ext_list;
     78 }
     79 
     80 /*
     81  * v2i_TLS_FEATURE converts the multi-valued extension nval into a TLS_FEATURE
     82  * structure, which is returned if the conversion is successful.  In case of
     83  * error, NULL is returned.
     84  */
     85 static TLS_FEATURE *v2i_TLS_FEATURE(const X509V3_EXT_METHOD *method,
     86     X509V3_CTX *ctx, STACK_OF(CONF_VALUE) *nval)
     87 {
     88     TLS_FEATURE *tlsf;
     89     char *extval, *endptr;
     90     ASN1_INTEGER *ai = NULL;
     91     CONF_VALUE *val;
     92     int i;
     93     size_t j;
     94     long tlsextid;
     95 
     96     if ((tlsf = sk_ASN1_INTEGER_new_null()) == NULL) {
     97         ERR_raise(ERR_LIB_X509V3, ERR_R_CRYPTO_LIB);
     98         return NULL;
     99     }
    100 
    101     for (i = 0; i < sk_CONF_VALUE_num(nval); i++) {
    102         val = sk_CONF_VALUE_value(nval, i);
    103         if (val->value)
    104             extval = val->value;
    105         else
    106             extval = val->name;
    107 
    108         for (j = 0; j < OSSL_NELEM(tls_feature_tbl); j++)
    109             if (OPENSSL_strcasecmp(extval, tls_feature_tbl[j].name) == 0)
    110                 break;
    111         if (j < OSSL_NELEM(tls_feature_tbl))
    112             tlsextid = tls_feature_tbl[j].num;
    113         else {
    114             tlsextid = strtol(extval, &endptr, 10);
    115             if (((*endptr) != '\0') || (extval == endptr) || (tlsextid < 0) || (tlsextid > 65535)) {
    116                 ERR_raise(ERR_LIB_X509V3, X509V3_R_INVALID_SYNTAX);
    117                 X509V3_conf_add_error_name_value(val);
    118                 goto err;
    119             }
    120         }
    121 
    122         if ((ai = ASN1_INTEGER_new()) == NULL
    123             || !ASN1_INTEGER_set(ai, tlsextid)
    124             || sk_ASN1_INTEGER_push(tlsf, ai) <= 0) {
    125             ERR_raise(ERR_LIB_X509V3, ERR_R_ASN1_LIB);
    126             goto err;
    127         }
    128         /* So it doesn't get purged if an error occurs next time around */
    129         ai = NULL;
    130     }
    131     return tlsf;
    132 
    133 err:
    134     sk_ASN1_INTEGER_pop_free(tlsf, ASN1_INTEGER_free);
    135     ASN1_INTEGER_free(ai);
    136     return NULL;
    137 }
    138