/* $OpenBSD: tasn_fre.c,v 1.20 2022/05/12 19:55:58 jsing 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_locl.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);

}

void

ASN1_item_ex_free(ASN1_VALUE **pval, const ASN1_ITEM *it)

{

  asn1_item_free(pval, it);

}

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 wont be able to

     * determine the type of the field it defines. So

     * free up in reverse order.

     */

    tt = it->templates + it->tcount - 1;

    for (i = 0; i < it->tcount; tt--, i++) {

      ASN1_VALUE **pseqval;

      seqtt = asn1_do_adb(pval, tt, 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;

}