/* $OpenBSD: bio_ndef.c,v 1.11 2021/12/25 13:17:48 jsing Exp $ */

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

 * project.

 */

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

 * Copyright (c) 2008 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

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 */

#include <openssl/asn1.h>

#include <openssl/asn1t.h>

#include <openssl/bio.h>

#include <openssl/err.h>

#include <stdio.h>

/* Experimental NDEF ASN1 BIO support routines */

/* The usage is quite simple, initialize an ASN1 structure,

 * get a BIO from it then any data written through the BIO

 * will end up translated to approptiate format on the fly.

 * The data is streamed out and does *not* need to be

 * all held in memory at once.

 *

 * When the BIO is flushed the output is finalized and any

 * signatures etc written out.

 *

 * The BIO is a 'proper' BIO and can handle non blocking I/O

 * correctly.

 *

 * The usage is simple. The implementation is *not*...

 */

/* BIO support data stored in the ASN1 BIO ex_arg */

typedef struct ndef_aux_st {

  /* ASN1 structure this BIO refers to */

  ASN1_VALUE *val;

  const ASN1_ITEM *it;

  /* Top of the BIO chain */

  BIO *ndef_bio;

  /* Output BIO */

  BIO *out;

  /* Boundary where content is inserted */

  unsigned char **boundary;

  /* DER buffer start */

  unsigned char *derbuf;

} NDEF_SUPPORT;

static int ndef_prefix(BIO *b, unsigned char **pbuf, int *plen, void *parg);

static int ndef_prefix_free(BIO *b, unsigned char **pbuf, int *plen, void *parg);

static int ndef_suffix(BIO *b, unsigned char **pbuf, int *plen, void *parg);

static int ndef_suffix_free(BIO *b, unsigned char **pbuf, int *plen, void *parg);

BIO *

BIO_new_NDEF(BIO *out, ASN1_VALUE *val, const ASN1_ITEM *it)

{

  NDEF_SUPPORT *ndef_aux = NULL;

  BIO *asn_bio = NULL;

  const ASN1_AUX *aux = it->funcs;

  ASN1_STREAM_ARG sarg;

  if (!aux || !aux->asn1_cb) {

    ASN1error(ASN1_R_STREAMING_NOT_SUPPORTED);

    return NULL;

  }

  ndef_aux = malloc(sizeof(NDEF_SUPPORT));

  asn_bio = BIO_new(BIO_f_asn1());

  /* ASN1 bio needs to be next to output BIO */

  out = BIO_push(asn_bio, out);

  if (!ndef_aux || !asn_bio || !out)

    goto err;

  BIO_asn1_set_prefix(asn_bio, ndef_prefix, ndef_prefix_free);

  BIO_asn1_set_suffix(asn_bio, ndef_suffix, ndef_suffix_free);

  /* Now let callback prepend any digest, cipher etc BIOs

   * ASN1 structure needs.

   */

  sarg.out = out;

  sarg.ndef_bio = NULL;

  sarg.boundary = NULL;

  if (aux->asn1_cb(ASN1_OP_STREAM_PRE, &val, it, &sarg) <= 0)

    goto err;

  ndef_aux->val = val;

  ndef_aux->it = it;

  ndef_aux->ndef_bio = sarg.ndef_bio;

  ndef_aux->boundary = sarg.boundary;

  ndef_aux->out = out;

  BIO_ctrl(asn_bio, BIO_C_SET_EX_ARG, 0, ndef_aux);

  return sarg.ndef_bio;

 err:

  BIO_free(asn_bio);

  free(ndef_aux);

  return NULL;

}

static int

ndef_prefix(BIO *b, unsigned char **pbuf, int *plen, void *parg)

{

  NDEF_SUPPORT *ndef_aux;

  unsigned char *p;

  int derlen;

  if (!parg)

    return 0;

  ndef_aux = *(NDEF_SUPPORT **)parg;

  derlen = ASN1_item_ndef_i2d(ndef_aux->val, NULL, ndef_aux->it);

  p = malloc(derlen);

  ndef_aux->derbuf = p;

  *pbuf = p;

  derlen = ASN1_item_ndef_i2d(ndef_aux->val, &p, ndef_aux->it);

  if (!*ndef_aux->boundary)

    return 0;

  *plen = *ndef_aux->boundary - *pbuf;

  return 1;

}

static int

ndef_prefix_free(BIO *b, unsigned char **pbuf, int *plen, void *parg)

{

  NDEF_SUPPORT *ndef_aux;

  if (!parg)

    return 0;

  ndef_aux = *(NDEF_SUPPORT **)parg;

  free(ndef_aux->derbuf);

  ndef_aux->derbuf = NULL;

  *pbuf = NULL;

  *plen = 0;

  return 1;

}

static int

ndef_suffix_free(BIO *b, unsigned char **pbuf, int *plen, void *parg)

{

  NDEF_SUPPORT **pndef_aux = (NDEF_SUPPORT **)parg;

  if (!ndef_prefix_free(b, pbuf, plen, parg))

    return 0;

  free(*pndef_aux);

  *pndef_aux = NULL;

  return 1;

}

static int

ndef_suffix(BIO *b, unsigned char **pbuf, int *plen, void *parg)

{

  NDEF_SUPPORT *ndef_aux;

  unsigned char *p;

  int derlen;

  const ASN1_AUX *aux;

  ASN1_STREAM_ARG sarg;

  if (!parg)

    return 0;

  ndef_aux = *(NDEF_SUPPORT **)parg;

  aux = ndef_aux->it->funcs;

  /* Finalize structures */

  sarg.ndef_bio = ndef_aux->ndef_bio;

  sarg.out = ndef_aux->out;

  sarg.boundary = ndef_aux->boundary;

  if (aux->asn1_cb(ASN1_OP_STREAM_POST,

      &ndef_aux->val, ndef_aux->it, &sarg) <= 0)

    return 0;

  derlen = ASN1_item_ndef_i2d(ndef_aux->val, NULL, ndef_aux->it);

  p = malloc(derlen);

  ndef_aux->derbuf = p;

  *pbuf = p;

  derlen = ASN1_item_ndef_i2d(ndef_aux->val, &p, ndef_aux->it);

  if (!*ndef_aux->boundary)

    return 0;

  *pbuf = *ndef_aux->boundary;

  *plen = derlen - (*ndef_aux->boundary - ndef_aux->derbuf);

  return 1;

}