/*

 * Copyright 1999-2026 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 <stdio.h>

#include "internal/cryptlib.h"

#include <openssl/asn1.h>

#include <openssl/asn1t.h>

#include <openssl/conf.h>

#include <openssl/x509v3.h>

#include "ext_dat.h"

#include "x509_local.h"

#include <crypto/asn1.h>

static STACK_OF(CONF_VALUE) *i2v_BASIC_CONSTRAINTS(X509V3_EXT_METHOD *method,

    BASIC_CONSTRAINTS *bcons,

    STACK_OF(CONF_VALUE)

        *extlist);

static BASIC_CONSTRAINTS *v2i_BASIC_CONSTRAINTS(X509V3_EXT_METHOD *method,

    X509V3_CTX *ctx,

    STACK_OF(CONF_VALUE) *values);

const X509V3_EXT_METHOD ossl_v3_bcons = {

    NID_basic_constraints, 0,

    ASN1_ITEM_ref(BASIC_CONSTRAINTS),

    0, 0, 0, 0,

    0, 0,

    (X509V3_EXT_I2V)i2v_BASIC_CONSTRAINTS,

    (X509V3_EXT_V2I)v2i_BASIC_CONSTRAINTS,

    NULL, NULL,

    NULL

};

ASN1_SEQUENCE(BASIC_CONSTRAINTS) = {

    ASN1_OPT(BASIC_CONSTRAINTS, ca, ASN1_FBOOLEAN),

    ASN1_OPT(BASIC_CONSTRAINTS, pathlen, ASN1_INTEGER)

} ASN1_SEQUENCE_END(BASIC_CONSTRAINTS)

IMPLEMENT_ASN1_FUNCTIONS(BASIC_CONSTRAINTS)

static STACK_OF(CONF_VALUE) *i2v_BASIC_CONSTRAINTS(X509V3_EXT_METHOD *method,

    BASIC_CONSTRAINTS *bcons,

    STACK_OF(CONF_VALUE)

        *extlist)

{

    X509V3_add_value_bool("CA", bcons->ca, &extlist);

    X509V3_add_value_int("pathlen", bcons->pathlen, &extlist);

    return extlist;

}

static BASIC_CONSTRAINTS *v2i_BASIC_CONSTRAINTS(X509V3_EXT_METHOD *method,

    X509V3_CTX *ctx,

    STACK_OF(CONF_VALUE) *values)

{

    BASIC_CONSTRAINTS *bcons = NULL;

    CONF_VALUE *val;

    int i, ca_seen = 0;

    if ((bcons = BASIC_CONSTRAINTS_new()) == NULL) {

        ERR_raise(ERR_LIB_X509V3, ERR_R_ASN1_LIB);

        return NULL;

    }

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

        val = sk_CONF_VALUE_value(values, i);

        if (strcmp(val->name, "CA") == 0) {

            if (ca_seen) {

                ERR_raise_data(ERR_LIB_X509V3, X509V3_R_DUPLICATE_FIELD,

                    "field=%s", val->name);

                goto err;

            }

            if (!X509V3_get_value_bool(val, &bcons->ca))

                goto err;

            ca_seen = 1;

        } else if (strcmp(val->name, "pathlen") == 0) {

            if (bcons->pathlen != NULL) {

                ERR_raise_data(ERR_LIB_X509V3, X509V3_R_DUPLICATE_FIELD,

                    "field=%s", val->name);

                goto err;

            }

            if (!X509V3_get_value_int(val, &bcons->pathlen))

                goto err;

        } else {

            ERR_raise(ERR_LIB_X509V3, X509V3_R_INVALID_NAME);

            X509V3_conf_add_error_name_value(val);

            goto err;

        }

    }

    return bcons;

err:

    BASIC_CONSTRAINTS_free(bcons);

    return NULL;

}