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/* $OpenBSD: tasn_fre.c,v 1.15 2016/12/30 16:04:34 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>
static void asn1_item_combine_free(ASN1_VALUE **pval, const ASN1_ITEM *it,
int combine);
/* Free up an ASN1 structure */
void
ASN1_item_free(ASN1_VALUE *val, const ASN1_ITEM *it)
{
asn1_item_combine_free(&val, it, 0);
}
void
ASN1_item_ex_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
{
asn1_item_combine_free(pval, it, 0);
}
static void
asn1_item_combine_free(ASN1_VALUE **pval, const ASN1_ITEM *it, int combine)
{
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 || *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);
if (!combine) {
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_free(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);
if (!combine) {
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_combine_free(&vtmp, tt->item,
0);
}
sk_ASN1_VALUE_free(sk);
*pval = NULL;
} else
asn1_item_combine_free(pval, tt->item,
tt->flags & ASN1_TFLG_COMBINE);
}
void
ASN1_primitive_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
{
int utype;
if (it) {
const ASN1_PRIMITIVE_FUNCS *pf;
pf = it->funcs;
if (pf && pf->prim_free) {
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;
}
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