/* $OpenBSD: tasn_new.c,v 1.26 2025/05/10 05:54:38 tb 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/asn1t.h>
#include <string.h>

#include "asn1_local.h"
#include "err_local.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;
}
LCRYPTO_ALIAS(ASN1_item_new);

/* Allocate an ASN1 structure */

int
ASN1_item_ex_new(ASN1_VALUE **pval, const ASN1_ITEM *it)
{
        return asn1_item_ex_new(pval, it);
}
LCRYPTO_ALIAS(ASN1_item_ex_new);

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;
}