/* $OpenBSD: tasn_new.c,v 1.22 2022/05/10 05:19:22 jsing Exp $ */

/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL

 * project 2000.

 */

/* ====================================================================

 * Copyright (c) 2000-2004 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/objects.h>

#include <openssl/err.h>

#include <openssl/asn1t.h>

#include <string.h>

#include "asn1_locl.h"

static int asn1_item_ex_new(ASN1_VALUE **pval, const ASN1_ITEM *it);

static void asn1_item_clear(ASN1_VALUE **pval, const ASN1_ITEM *it);

static void asn1_template_clear(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt);

static void asn1_primitive_clear(ASN1_VALUE **pval, const ASN1_ITEM *it);

ASN1_VALUE *

ASN1_item_new(const ASN1_ITEM *it)

{

  ASN1_VALUE *ret = NULL;

  if (ASN1_item_ex_new(&ret, it) > 0)

    return ret;

  return NULL;

}

/* Allocate an ASN1 structure */

int

ASN1_item_ex_new(ASN1_VALUE **pval, const ASN1_ITEM *it)

{

  return asn1_item_ex_new(pval, it);

}

static int

asn1_item_ex_new(ASN1_VALUE **pval, const ASN1_ITEM *it)

{

  const ASN1_TEMPLATE *tt = NULL;

  const ASN1_EXTERN_FUNCS *ef;

  const ASN1_AUX *aux = it->funcs;

  ASN1_aux_cb *asn1_cb = NULL;

  ASN1_VALUE **pseqval;

  int i;

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

    asn1_cb = aux->asn1_cb;

  *pval = NULL;

  switch (it->itype) {

  case ASN1_ITYPE_EXTERN:

    ef = it->funcs;

    if (ef && ef->asn1_ex_new) {

      if (!ef->asn1_ex_new(pval, it))

        goto memerr;

    }

    break;

  case ASN1_ITYPE_PRIMITIVE:

    if (it->templates) {

      if (!ASN1_template_new(pval, it->templates))

        goto memerr;

    } else if (!ASN1_primitive_new(pval, it))

      goto memerr;

    break;

  case ASN1_ITYPE_MSTRING:

    if (!ASN1_primitive_new(pval, it))

      goto memerr;

    break;

  case ASN1_ITYPE_CHOICE:

    if (asn1_cb) {

      i = asn1_cb(ASN1_OP_NEW_PRE, pval, it, NULL);

      if (!i)

        goto auxerr;

      if (i == 2) {

        return 1;

      }

    }

    *pval = calloc(1, it->size);

    if (!*pval)

      goto memerr;

    asn1_set_choice_selector(pval, -1, it);

    if (asn1_cb && !asn1_cb(ASN1_OP_NEW_POST, pval, it, NULL))

      goto auxerr;

    break;

  case ASN1_ITYPE_NDEF_SEQUENCE:

  case ASN1_ITYPE_SEQUENCE:

    if (asn1_cb) {

      i = asn1_cb(ASN1_OP_NEW_PRE, pval, it, NULL);

      if (!i)

        goto auxerr;

      if (i == 2) {

        return 1;

      }

    }

    *pval = calloc(1, it->size);

    if (!*pval)

      goto memerr;

    asn1_do_lock(pval, 0, it);

    asn1_enc_init(pval, it);

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

      pseqval = asn1_get_field_ptr(pval, tt);

      if (!ASN1_template_new(pseqval, tt))

        goto memerr;

    }

    if (asn1_cb && !asn1_cb(ASN1_OP_NEW_POST, pval, it, NULL))

      goto auxerr;

    break;

  }

  return 1;

 memerr:

  ASN1error(ERR_R_MALLOC_FAILURE);

  return 0;

 auxerr:

  ASN1error(ASN1_R_AUX_ERROR);

  ASN1_item_ex_free(pval, it);

  return 0;

}

static void

asn1_item_clear(ASN1_VALUE **pval, const ASN1_ITEM *it)

{

  const ASN1_EXTERN_FUNCS *ef;

  switch (it->itype) {

  case ASN1_ITYPE_EXTERN:

    ef = it->funcs;

    if (ef && ef->asn1_ex_clear)

      ef->asn1_ex_clear(pval, it);

    else

      *pval = NULL;

    break;

  case ASN1_ITYPE_PRIMITIVE:

    if (it->templates)

      asn1_template_clear(pval, it->templates);

    else

      asn1_primitive_clear(pval, it);

    break;

  case ASN1_ITYPE_MSTRING:

    asn1_primitive_clear(pval, it);

    break;

  case ASN1_ITYPE_CHOICE:

  case ASN1_ITYPE_SEQUENCE:

  case ASN1_ITYPE_NDEF_SEQUENCE:

    *pval = NULL;

    break;

  }

}

int

ASN1_template_new(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt)

{

  const ASN1_ITEM *it = tt->item;

  int ret;

  if (tt->flags & ASN1_TFLG_OPTIONAL) {

    asn1_template_clear(pval, tt);

    return 1;

  }

  /* If ANY DEFINED BY nothing to do */

  if (tt->flags & ASN1_TFLG_ADB_MASK) {

    *pval = NULL;

    return 1;

  }

  /* If SET OF or SEQUENCE OF, its a STACK */

  if (tt->flags & ASN1_TFLG_SK_MASK) {

    STACK_OF(ASN1_VALUE) *skval;

    skval = sk_ASN1_VALUE_new_null();

    if (!skval) {

      ASN1error(ERR_R_MALLOC_FAILURE);

      ret = 0;

      goto done;

    }

    *pval = (ASN1_VALUE *)skval;

    ret = 1;

    goto done;

  }

  /* Otherwise pass it back to the item routine */

  ret = asn1_item_ex_new(pval, it);

 done:

  return ret;

}

static void

asn1_template_clear(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt)

{

  /* If ADB or STACK just NULL the field */

  if (tt->flags & (ASN1_TFLG_ADB_MASK|ASN1_TFLG_SK_MASK))

    *pval = NULL;

  else

    asn1_item_clear(pval, tt->item);

}

/* NB: could probably combine most of the real XXX_new() behaviour and junk

 * all the old functions.

 */

int

ASN1_primitive_new(ASN1_VALUE **pval, const ASN1_ITEM *it)

{

  ASN1_TYPE *typ;

  ASN1_STRING *str;

  int utype;

  if (it != NULL && it->funcs != NULL) {

    const ASN1_PRIMITIVE_FUNCS *pf = it->funcs;

    if (pf->prim_new == NULL)

      return 0;

    return pf->prim_new(pval, it);

  }

  if (!it || (it->itype == ASN1_ITYPE_MSTRING))

    utype = V_ASN1_UNDEF;

  else

    utype = it->utype;

  switch (utype) {

  case V_ASN1_OBJECT:

    *pval = (ASN1_VALUE *)OBJ_nid2obj(NID_undef);

    return 1;

  case V_ASN1_BOOLEAN:

    *(ASN1_BOOLEAN *)pval = it->size;

    return 1;

  case V_ASN1_NULL:

    *pval = (ASN1_VALUE *)1;

    return 1;

  case V_ASN1_ANY:

    typ = malloc(sizeof(ASN1_TYPE));

    if (typ != NULL) {

      typ->value.ptr = NULL;

      typ->type = V_ASN1_UNDEF;

    }

    *pval = (ASN1_VALUE *)typ;

    break;

  default:

    str = ASN1_STRING_type_new(utype);

    if (it != NULL && it->itype == ASN1_ITYPE_MSTRING &&

        str != NULL)

      str->flags |= ASN1_STRING_FLAG_MSTRING;

    *pval = (ASN1_VALUE *)str;

    break;

  }

  if (*pval)

    return 1;

  return 0;

}

static void

asn1_primitive_clear(ASN1_VALUE **pval, const ASN1_ITEM *it)

{

  int utype;

  if (it != NULL && it->funcs != NULL) {

    const ASN1_PRIMITIVE_FUNCS *pf = it->funcs;

    if (pf->prim_clear)

      pf->prim_clear(pval, it);

    else

      *pval = NULL;

    return;

  }

  if (!it || (it->itype == ASN1_ITYPE_MSTRING))

    utype = V_ASN1_UNDEF;

  else

    utype = it->utype;

  if (utype == V_ASN1_BOOLEAN)

    *(ASN1_BOOLEAN *)pval = it->size;

  else

    *pval = NULL;

}