Viewing file:  tasn_fre.c (5.47 KB) -rw-r--r--
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/*
* Copyright 2000-2021 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <stddef.h>
#include <openssl/asn1.h>
#include <openssl/asn1t.h>
#include <openssl/objects.h>
#include "asn1_local.h"
/* Free up an ASN1 structure */
void ASN1_item_free(ASN1_VALUE *val, const ASN1_ITEM *it)
{
ossl_asn1_item_embed_free(&val, it, 0);
}
void ASN1_item_ex_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
{
ossl_asn1_item_embed_free(pval, it, 0);
}
void ossl_asn1_item_embed_free(ASN1_VALUE **pval, const ASN1_ITEM *it, int embed)
{
const ASN1_TEMPLATE *tt = NULL, *seqtt;
const ASN1_EXTERN_FUNCS *ef;
const ASN1_AUX *aux = it->funcs;
ASN1_aux_cb *asn1_cb;
int i;
if (pval == NULL)
return;
if ((it->itype != ASN1_ITYPE_PRIMITIVE) && *pval == NULL)
return;
if (aux && aux->asn1_cb)
asn1_cb = aux->asn1_cb;
else
asn1_cb = 0;
switch (it->itype) {
case ASN1_ITYPE_PRIMITIVE:
if (it->templates)
ossl_asn1_template_free(pval, it->templates);
else
ossl_asn1_primitive_free(pval, it, embed);
break;
case ASN1_ITYPE_MSTRING:
ossl_asn1_primitive_free(pval, it, embed);
break;
case ASN1_ITYPE_CHOICE:
if (asn1_cb) {
i = asn1_cb(ASN1_OP_FREE_PRE, pval, it, NULL);
if (i == 2)
return;
}
i = ossl_asn1_get_choice_selector(pval, it);
if ((i >= 0) && (i < it->tcount)) {
ASN1_VALUE **pchval;
tt = it->templates + i;
pchval = ossl_asn1_get_field_ptr(pval, tt);
ossl_asn1_template_free(pchval, tt);
}
if (asn1_cb)
asn1_cb(ASN1_OP_FREE_POST, pval, it, NULL);
if (embed == 0) {
OPENSSL_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 (ossl_asn1_do_lock(pval, -1, it) != 0) /* if error or ref-counter > 0 */
return;
if (asn1_cb) {
i = asn1_cb(ASN1_OP_FREE_PRE, pval, it, NULL);
if (i == 2)
return;
}
ossl_asn1_enc_free(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.
*/
tt = it->templates + it->tcount;
for (i = 0; i < it->tcount; i++) {
ASN1_VALUE **pseqval;
tt--;
seqtt = ossl_asn1_do_adb(*pval, tt, 0);
if (!seqtt)
continue;
pseqval = ossl_asn1_get_field_ptr(pval, seqtt);
ossl_asn1_template_free(pseqval, seqtt);
}
if (asn1_cb)
asn1_cb(ASN1_OP_FREE_POST, pval, it, NULL);
if (embed == 0) {
OPENSSL_free(*pval);
*pval = NULL;
}
break;
}
}
void ossl_asn1_template_free(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt)
{
int embed = tt->flags & ASN1_TFLG_EMBED;
ASN1_VALUE *tval;
if (embed) {
tval = (ASN1_VALUE *)pval;
pval = &tval;
}
if (tt->flags & ASN1_TFLG_SK_MASK) {
STACK_OF(ASN1_VALUE) *sk = (STACK_OF(ASN1_VALUE) *)*pval;
int i;
for (i = 0; i < sk_ASN1_VALUE_num(sk); i++) {
ASN1_VALUE *vtmp = sk_ASN1_VALUE_value(sk, i);
ossl_asn1_item_embed_free(&vtmp, ASN1_ITEM_ptr(tt->item), embed);
}
sk_ASN1_VALUE_free(sk);
*pval = NULL;
} else {
ossl_asn1_item_embed_free(pval, ASN1_ITEM_ptr(tt->item), embed);
}
}
void ossl_asn1_primitive_free(ASN1_VALUE **pval, const ASN1_ITEM *it, int embed)
{
int utype;
/* Special case: if 'it' is a primitive with a free_func, use that. */
if (it) {
const ASN1_PRIMITIVE_FUNCS *pf = it->funcs;
if (embed) {
if (pf && pf->prim_clear) {
pf->prim_clear(pval, it);
return;
}
} else 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 == NULL)
return;
} else if (it->itype == ASN1_ITYPE_MSTRING) {
utype = -1;
if (*pval == NULL)
return;
} else {
utype = it->utype;
if ((utype != V_ASN1_BOOLEAN) && *pval == NULL)
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:
ossl_asn1_primitive_free(pval, NULL, 0);
OPENSSL_free(*pval);
break;
default:
ossl_asn1_string_embed_free((ASN1_STRING *)*pval, embed);
break;
}
*pval = NULL;
}
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