/* $OpenBSD: x509_pcons.c,v 1.7 2025/05/10 05:54:39 tb Exp $ */
/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
 * project.
 */
/* ====================================================================
 * Copyright (c) 2003 The OpenSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    licensing@OpenSSL.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */

#include <stdio.h>
#include <string.h>

#include <openssl/asn1.h>
#include <openssl/asn1t.h>
#include <openssl/conf.h>
#include <openssl/x509v3.h>

#include "err_local.h"
#include "x509_local.h"

static STACK_OF(CONF_VALUE) *
i2v_POLICY_CONSTRAINTS(const X509V3_EXT_METHOD *method, void *bcons,
    STACK_OF(CONF_VALUE) *extlist);
static void *v2i_POLICY_CONSTRAINTS(const X509V3_EXT_METHOD *method,
    X509V3_CTX *ctx, STACK_OF(CONF_VALUE) *values);

static const X509V3_EXT_METHOD x509v3_ext_policy_constraints = {
        .ext_nid = NID_policy_constraints,
        .ext_flags = 0,
        .it = &POLICY_CONSTRAINTS_it,
        .ext_new = NULL,
        .ext_free = NULL,
        .d2i = NULL,
        .i2d = NULL,
        .i2s = NULL,
        .s2i = NULL,
        .i2v = i2v_POLICY_CONSTRAINTS,
        .v2i = v2i_POLICY_CONSTRAINTS,
        .i2r = NULL,
        .r2i = NULL,
        .usr_data = NULL,
};

const X509V3_EXT_METHOD *
x509v3_ext_method_policy_constraints(void)
{
        return &x509v3_ext_policy_constraints;
}

static const ASN1_TEMPLATE POLICY_CONSTRAINTS_seq_tt[] = {
        {
                .flags = ASN1_TFLG_IMPLICIT | ASN1_TFLG_OPTIONAL,
                .tag = 0,
                .offset = offsetof(POLICY_CONSTRAINTS, requireExplicitPolicy),
                .field_name = "requireExplicitPolicy",
                .item = &ASN1_INTEGER_it,
        },
        {
                .flags = ASN1_TFLG_IMPLICIT | ASN1_TFLG_OPTIONAL,
                .tag = 1,
                .offset = offsetof(POLICY_CONSTRAINTS, inhibitPolicyMapping),
                .field_name = "inhibitPolicyMapping",
                .item = &ASN1_INTEGER_it,
        },
};

const ASN1_ITEM POLICY_CONSTRAINTS_it = {
        .itype = ASN1_ITYPE_SEQUENCE,
        .utype = V_ASN1_SEQUENCE,
        .templates = POLICY_CONSTRAINTS_seq_tt,
        .tcount = sizeof(POLICY_CONSTRAINTS_seq_tt) / sizeof(ASN1_TEMPLATE),
        .funcs = NULL,
        .size = sizeof(POLICY_CONSTRAINTS),
        .sname = "POLICY_CONSTRAINTS",
};
LCRYPTO_ALIAS(POLICY_CONSTRAINTS_it);


POLICY_CONSTRAINTS *
POLICY_CONSTRAINTS_new(void)
{
        return (POLICY_CONSTRAINTS*)ASN1_item_new(&POLICY_CONSTRAINTS_it);
}
LCRYPTO_ALIAS(POLICY_CONSTRAINTS_new);

void
POLICY_CONSTRAINTS_free(POLICY_CONSTRAINTS *a)
{
        ASN1_item_free((ASN1_VALUE *)a, &POLICY_CONSTRAINTS_it);
}
LCRYPTO_ALIAS(POLICY_CONSTRAINTS_free);

static STACK_OF(CONF_VALUE) *
i2v_POLICY_CONSTRAINTS(const X509V3_EXT_METHOD *method, void *a,
    STACK_OF(CONF_VALUE) *extlist)
{
        POLICY_CONSTRAINTS *pcons = a;
        STACK_OF(CONF_VALUE) *free_extlist = NULL;

        if (extlist == NULL) {
                if ((free_extlist = extlist = sk_CONF_VALUE_new_null()) == NULL)
                        return NULL;
        }

        if (!X509V3_add_value_int("Require Explicit Policy",
            pcons->requireExplicitPolicy, &extlist))
                goto err;
        if (!X509V3_add_value_int("Inhibit Policy Mapping",
            pcons->inhibitPolicyMapping, &extlist))
                goto err;

        return extlist;

 err:
        sk_CONF_VALUE_pop_free(free_extlist, X509V3_conf_free);

        return NULL;
}

static void *
v2i_POLICY_CONSTRAINTS(const X509V3_EXT_METHOD *method, X509V3_CTX *ctx,
    STACK_OF(CONF_VALUE) *values)
{
        POLICY_CONSTRAINTS *pcons = NULL;
        CONF_VALUE *val;
        int i;

        if (!(pcons = POLICY_CONSTRAINTS_new())) {
                X509V3error(ERR_R_MALLOC_FAILURE);
                return NULL;
        }
        for (i = 0; i < sk_CONF_VALUE_num(values); i++) {
                val = sk_CONF_VALUE_value(values, i);
                if (!strcmp(val->name, "requireExplicitPolicy")) {
                        if (!X509V3_get_value_int(val,
                            &pcons->requireExplicitPolicy)) goto err;
                } else if (!strcmp(val->name, "inhibitPolicyMapping")) {
                        if (!X509V3_get_value_int(val,
                            &pcons->inhibitPolicyMapping)) goto err;
                } else {
                        X509V3error(X509V3_R_INVALID_NAME);
                        X509V3_conf_err(val);
                        goto err;
                }
        }
        if (!pcons->inhibitPolicyMapping && !pcons->requireExplicitPolicy) {
                X509V3error(X509V3_R_ILLEGAL_EMPTY_EXTENSION);
                goto err;
        }

        return pcons;

err:
        POLICY_CONSTRAINTS_free(pcons);
        return NULL;
}