/*

 * Copyright 2015-2022 The OpenSSL Project Authors. All Rights Reserved.

 *

 * Licensed under the Apache License 2.0 (the "License").  You may not use

 * this file except in compliance with the License.  You can obtain a copy

 * in the file LICENSE in the source distribution or at

 * https://www.openssl.org/source/license.html

 */

#include "internal/e_os.h"

#include "internal/cryptlib.h"

#include <stdio.h>

#include <openssl/asn1t.h>

#include <openssl/conf.h>

#include <openssl/x509v3.h>

#include "ext_dat.h"

#include "x509_local.h"

static STACK_OF(CONF_VALUE) *i2v_TLS_FEATURE(const X509V3_EXT_METHOD *method,

                                             TLS_FEATURE *tls_feature,

                                             STACK_OF(CONF_VALUE) *ext_list);

static TLS_FEATURE *v2i_TLS_FEATURE(const X509V3_EXT_METHOD *method,

                                    X509V3_CTX *ctx,

                                    STACK_OF(CONF_VALUE) *nval);

ASN1_ITEM_TEMPLATE(TLS_FEATURE) =

        ASN1_EX_TEMPLATE_TYPE(ASN1_TFLG_SEQUENCE_OF, 0, TLS_FEATURE, ASN1_INTEGER)

static_ASN1_ITEM_TEMPLATE_END(TLS_FEATURE)

IMPLEMENT_ASN1_ALLOC_FUNCTIONS(TLS_FEATURE)

const X509V3_EXT_METHOD ossl_v3_tls_feature = {

    NID_tlsfeature, 0,

    ASN1_ITEM_ref(TLS_FEATURE),

    0, 0, 0, 0,

    0, 0,

    (X509V3_EXT_I2V)i2v_TLS_FEATURE,

    (X509V3_EXT_V2I)v2i_TLS_FEATURE,

    0, 0,

    NULL

};

typedef struct {

    long num;

    const char *name;

} TLS_FEATURE_NAME;

static TLS_FEATURE_NAME tls_feature_tbl[] = {

    { 5, "status_request" },

    { 17, "status_request_v2" }

};

/*

 * i2v_TLS_FEATURE converts the TLS_FEATURE structure tls_feature into the

 * STACK_OF(CONF_VALUE) structure ext_list. STACK_OF(CONF_VALUE) is the format

 * used by the CONF library to represent a multi-valued extension.  ext_list is

 * returned.

 */

static STACK_OF(CONF_VALUE) *i2v_TLS_FEATURE(const X509V3_EXT_METHOD *method,

                                             TLS_FEATURE *tls_feature,

                                             STACK_OF(CONF_VALUE) *ext_list)

{

    int i;

    size_t j;

    ASN1_INTEGER *ai;

    long tlsextid;

    for (i = 0; i < sk_ASN1_INTEGER_num(tls_feature); i++) {

        ai = sk_ASN1_INTEGER_value(tls_feature, i);

        tlsextid = ASN1_INTEGER_get(ai);

        for (j = 0; j < OSSL_NELEM(tls_feature_tbl); j++)

            if (tlsextid == tls_feature_tbl[j].num)

                break;

        if (j < OSSL_NELEM(tls_feature_tbl))

            X509V3_add_value(NULL, tls_feature_tbl[j].name, &ext_list);

        else

            X509V3_add_value_int(NULL, ai, &ext_list);

    }

    return ext_list;

}

/*

 * v2i_TLS_FEATURE converts the multi-valued extension nval into a TLS_FEATURE

 * structure, which is returned if the conversion is successful.  In case of

 * error, NULL is returned.

 */

static TLS_FEATURE *v2i_TLS_FEATURE(const X509V3_EXT_METHOD *method,

                                    X509V3_CTX *ctx, STACK_OF(CONF_VALUE) *nval)

{

    TLS_FEATURE *tlsf;

    char *extval, *endptr;

    ASN1_INTEGER *ai = NULL;

    CONF_VALUE *val;

    int i;

    size_t j;

    long tlsextid;

    if ((tlsf = sk_ASN1_INTEGER_new_null()) == NULL) {

        ERR_raise(ERR_LIB_X509V3, ERR_R_CRYPTO_LIB);

        return NULL;

    }

    for (i = 0; i < sk_CONF_VALUE_num(nval); i++) {

        val = sk_CONF_VALUE_value(nval, i);

        if (val->value)

            extval = val->value;

        else

            extval = val->name;

        for (j = 0; j < OSSL_NELEM(tls_feature_tbl); j++)

            if (OPENSSL_strcasecmp(extval, tls_feature_tbl[j].name) == 0)

                break;

        if (j < OSSL_NELEM(tls_feature_tbl))

            tlsextid = tls_feature_tbl[j].num;

        else {

            tlsextid = strtol(extval, &endptr, 10);

            if (((*endptr) != '\0') || (extval == endptr) || (tlsextid < 0) ||

                (tlsextid > 65535)) {

                ERR_raise(ERR_LIB_X509V3, X509V3_R_INVALID_SYNTAX);

                X509V3_conf_add_error_name_value(val);

                goto err;

            }

        }

        if ((ai = ASN1_INTEGER_new()) == NULL

                || !ASN1_INTEGER_set(ai, tlsextid)

                || sk_ASN1_INTEGER_push(tlsf, ai) <= 0) {

            ERR_raise(ERR_LIB_X509V3, ERR_R_ASN1_LIB);

            goto err;

        }

        /* So it doesn't get purged if an error occurs next time around */

        ai = NULL;

    }

    return tlsf;

 err:

    sk_ASN1_INTEGER_pop_free(tlsf, ASN1_INTEGER_free);

    ASN1_INTEGER_free(ai);

    return NULL;

}