/* $OpenBSD: tasn_fre.c,v 1.25 2025/08/14 19:02:17 tb Exp $ */
/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
 * project 2000.
 */
/* ====================================================================
 * Copyright (c) 2000 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 <stddef.h>
#include <openssl/asn1.h>
#include <openssl/asn1t.h>
#include <openssl/objects.h>

#include "asn1_local.h"

static void asn1_item_free(ASN1_VALUE **pval, const ASN1_ITEM *it);

/* Free up an ASN1 structure */

void
ASN1_item_free(ASN1_VALUE *val, const ASN1_ITEM *it)
{
        asn1_item_free(&val, it);
}
LCRYPTO_ALIAS(ASN1_item_free);

void
ASN1_item_ex_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
{
        asn1_item_free(pval, it);
}
LCRYPTO_ALIAS(ASN1_item_ex_free);

static void
asn1_item_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
{
        const ASN1_TEMPLATE *tt = NULL, *seqtt;
        const ASN1_EXTERN_FUNCS *ef;
        const ASN1_AUX *aux = it->funcs;
        ASN1_aux_cb *asn1_cb = NULL;
        int i;

        if (pval == NULL)
                return;
        /* For primitive types *pval may be something other than C pointer. */
        if (it->itype != ASN1_ITYPE_PRIMITIVE && *pval == NULL)
                return;

        if (aux != NULL && aux->asn1_cb != NULL)
                asn1_cb = aux->asn1_cb;

        switch (it->itype) {
        case ASN1_ITYPE_PRIMITIVE:
                if (it->templates)
                        ASN1_template_free(pval, it->templates);
                else
                        ASN1_primitive_free(pval, it);
                break;

        case ASN1_ITYPE_MSTRING:
                ASN1_primitive_free(pval, it);
                break;

        case ASN1_ITYPE_CHOICE:
                if (asn1_cb) {
                        i = asn1_cb(ASN1_OP_FREE_PRE, pval, it, NULL);
                        if (i == 2)
                                return;
                }
                i = asn1_get_choice_selector(pval, it);
                if ((i >= 0) && (i < it->tcount)) {
                        ASN1_VALUE **pchval;
                        tt = it->templates + i;
                        pchval = asn1_get_field_ptr(pval, tt);
                        ASN1_template_free(pchval, tt);
                }
                if (asn1_cb)
                        asn1_cb(ASN1_OP_FREE_POST, pval, it, NULL);
                free(*pval);
                *pval = NULL;
                break;

        case ASN1_ITYPE_EXTERN:
                ef = it->funcs;
                if (ef && ef->asn1_ex_free)
                        ef->asn1_ex_free(pval, it);
                break;

        case ASN1_ITYPE_NDEF_SEQUENCE:
        case ASN1_ITYPE_SEQUENCE:
                if (asn1_do_lock(pval, -1, it) > 0)
                        return;
                if (asn1_cb) {
                        i = asn1_cb(ASN1_OP_FREE_PRE, pval, it, NULL);
                        if (i == 2)
                                return;
                }
                asn1_enc_cleanup(pval, it);
                /*
                 * If we free up as normal, we will invalidate any
                 * ANY DEFINED BY field and we won't be able to
                 * determine the type of the field it defines. So
                 * free up in reverse order.
                 */
                for (i = it->tcount - 1; i >= 0; i--) {
                        ASN1_VALUE **pseqval;
                        seqtt = asn1_do_adb(pval, &it->templates[i], 0);
                        if (!seqtt)
                                continue;
                        pseqval = asn1_get_field_ptr(pval, seqtt);
                        ASN1_template_free(pseqval, seqtt);
                }
                if (asn1_cb)
                        asn1_cb(ASN1_OP_FREE_POST, pval, it, NULL);
                free(*pval);
                *pval = NULL;
                break;
        }
}

void
ASN1_template_free(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt)
{
        int i;
        if (tt->flags & ASN1_TFLG_SK_MASK) {
                STACK_OF(ASN1_VALUE) *sk = (STACK_OF(ASN1_VALUE) *)*pval;
                for (i = 0; i < sk_ASN1_VALUE_num(sk); i++) {
                        ASN1_VALUE *vtmp;
                        vtmp = sk_ASN1_VALUE_value(sk, i);
                        asn1_item_free(&vtmp, tt->item);
                }
                sk_ASN1_VALUE_free(sk);
                *pval = NULL;
        } else
                asn1_item_free(pval, tt->item);
}

void
ASN1_primitive_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
{
        int utype;

        if (it != NULL && it->funcs != NULL) {
                const ASN1_PRIMITIVE_FUNCS *pf = it->funcs;

                pf->prim_free(pval, it);
                return;
        }

        /* Special case: if 'it' is NULL free contents of ASN1_TYPE */
        if (!it) {
                ASN1_TYPE *typ = (ASN1_TYPE *)*pval;
                utype = typ->type;
                pval = &typ->value.asn1_value;
                if (!*pval)
                        return;
        } else if (it->itype == ASN1_ITYPE_MSTRING) {
                utype = -1;
                if (!*pval)
                        return;
        } else {
                utype = it->utype;
                if ((utype != V_ASN1_BOOLEAN) && !*pval)
                        return;
        }

        switch (utype) {
        case V_ASN1_OBJECT:
                ASN1_OBJECT_free((ASN1_OBJECT *)*pval);
                break;

        case V_ASN1_BOOLEAN:
                if (it)
                        *(ASN1_BOOLEAN *)pval = it->size;
                else
                        *(ASN1_BOOLEAN *)pval = -1;
                return;

        case V_ASN1_NULL:
                break;

        case V_ASN1_ANY:
                ASN1_primitive_free(pval, NULL);
                free(*pval);
                break;

        default:
                ASN1_STRING_free((ASN1_STRING *)*pval);
                break;
        }
        *pval = NULL;
}