/* $OpenBSD: x509_v3.c,v 1.18 2021/11/01 20:53:08 tb Exp $ */

/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)

 * All rights reserved.

 *

 * This package is an SSL implementation written

 * by Eric Young (eay@cryptsoft.com).

 * The implementation was written so as to conform with Netscapes SSL.

 *

 * This library is free for commercial and non-commercial use as long as

 * the following conditions are aheared to.  The following conditions

 * apply to all code found in this distribution, be it the RC4, RSA,

 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation

 * included with this distribution is covered by the same copyright terms

 * except that the holder is Tim Hudson (tjh@cryptsoft.com).

 *

 * Copyright remains Eric Young's, and as such any Copyright notices in

 * the code are not to be removed.

 * If this package is used in a product, Eric Young should be given attribution

 * as the author of the parts of the library used.

 * This can be in the form of a textual message at program startup or

 * in documentation (online or textual) provided with the package.

 *

 * 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 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 acknowledgement:

 *    "This product includes cryptographic software written by

 *     Eric Young (eay@cryptsoft.com)"

 *    The word 'cryptographic' can be left out if the rouines from the library

 *    being used are not cryptographic related :-).

 * 4. If you include any Windows specific code (or a derivative thereof) from

 *    the apps directory (application code) you must include an acknowledgement:

 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"

 *

 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND

 * ANY EXPRESS 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 AUTHOR OR 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.

 *

 * The licence and distribution terms for any publically available version or

 * derivative of this code cannot be changed.  i.e. this code cannot simply be

 * copied and put under another distribution licence

 * [including the GNU Public Licence.]

 */

#include <stdio.h>

#include <openssl/asn1.h>

#include <openssl/err.h>

#include <openssl/evp.h>

#include <openssl/objects.h>

#include <openssl/stack.h>

#include <openssl/x509.h>

#include <openssl/x509v3.h>

#include "x509_lcl.h"

int

X509v3_get_ext_count(const STACK_OF(X509_EXTENSION) *x)

{

  if (x == NULL)

    return (0);

  return (sk_X509_EXTENSION_num(x));

}

int

X509v3_get_ext_by_NID(const STACK_OF(X509_EXTENSION) *x, int nid, int lastpos)

{

  ASN1_OBJECT *obj;

  obj = OBJ_nid2obj(nid);

  if (obj == NULL)

    return (-2);

  return (X509v3_get_ext_by_OBJ(x, obj, lastpos));

}

int

X509v3_get_ext_by_OBJ(const STACK_OF(X509_EXTENSION) *sk,

    const ASN1_OBJECT *obj, int lastpos)

{

  int n;

  X509_EXTENSION *ex;

  if (sk == NULL)

    return (-1);

  lastpos++;

  if (lastpos < 0)

    lastpos = 0;

  n = sk_X509_EXTENSION_num(sk);

  for (; lastpos < n; lastpos++) {

    ex = sk_X509_EXTENSION_value(sk, lastpos);

    if (OBJ_cmp(ex->object, obj) == 0)

      return (lastpos);

  }

  return (-1);

}

int

X509v3_get_ext_by_critical(const STACK_OF(X509_EXTENSION) *sk, int crit,

    int lastpos)

{

  int n;

  X509_EXTENSION *ex;

  if (sk == NULL)

    return (-1);

  lastpos++;

  if (lastpos < 0)

    lastpos = 0;

  n = sk_X509_EXTENSION_num(sk);

  for (; lastpos < n; lastpos++) {

    ex = sk_X509_EXTENSION_value(sk, lastpos);

    if (((ex->critical > 0) && crit) ||

        ((ex->critical <= 0) && !crit))

      return (lastpos);

  }

  return (-1);

}

X509_EXTENSION *

X509v3_get_ext(const STACK_OF(X509_EXTENSION) *x, int loc)

{

  if (x == NULL || sk_X509_EXTENSION_num(x) <= loc || loc < 0)

    return NULL;

  else

    return sk_X509_EXTENSION_value(x, loc);

}

X509_EXTENSION *

X509v3_delete_ext(STACK_OF(X509_EXTENSION) *x, int loc)

{

  X509_EXTENSION *ret;

  if (x == NULL || sk_X509_EXTENSION_num(x) <= loc || loc < 0)

    return (NULL);

  ret = sk_X509_EXTENSION_delete(x, loc);

  return (ret);

}

STACK_OF(X509_EXTENSION) *

X509v3_add_ext(STACK_OF(X509_EXTENSION) **x, X509_EXTENSION *ex, int loc)

{

  X509_EXTENSION *new_ex = NULL;

  int n;

  STACK_OF(X509_EXTENSION) *sk = NULL;

  if (x == NULL) {

    X509error(ERR_R_PASSED_NULL_PARAMETER);

    goto err2;

  }

  if (*x == NULL) {

    if ((sk = sk_X509_EXTENSION_new_null()) == NULL)

      goto err;

  } else

    sk= *x;

  n = sk_X509_EXTENSION_num(sk);

  if (loc > n)

    loc = n;

  else if (loc < 0)

    loc = n;

  if ((new_ex = X509_EXTENSION_dup(ex)) == NULL)

    goto err2;

  if (!sk_X509_EXTENSION_insert(sk, new_ex, loc))

    goto err;

  if (*x == NULL)

    *x = sk;

  return (sk);

err:

  X509error(ERR_R_MALLOC_FAILURE);

err2:

  if (new_ex != NULL)

    X509_EXTENSION_free(new_ex);

  if (sk != NULL && (x != NULL && sk != *x))

    sk_X509_EXTENSION_free(sk);

  return (NULL);

}

X509_EXTENSION *

X509_EXTENSION_create_by_NID(X509_EXTENSION **ex, int nid, int crit,

    ASN1_OCTET_STRING *data)

{

  ASN1_OBJECT *obj;

  X509_EXTENSION *ret;

  obj = OBJ_nid2obj(nid);

  if (obj == NULL) {

    X509error(X509_R_UNKNOWN_NID);

    return (NULL);

  }

  ret = X509_EXTENSION_create_by_OBJ(ex, obj, crit, data);

  if (ret == NULL)

    ASN1_OBJECT_free(obj);

  return (ret);

}

X509_EXTENSION *

X509_EXTENSION_create_by_OBJ(X509_EXTENSION **ex, const ASN1_OBJECT *obj,

    int crit, ASN1_OCTET_STRING *data)

{

  X509_EXTENSION *ret;

  if ((ex == NULL) || (*ex == NULL)) {

    if ((ret = X509_EXTENSION_new()) == NULL) {

      X509error(ERR_R_MALLOC_FAILURE);

      return (NULL);

    }

  } else

    ret= *ex;

  if (!X509_EXTENSION_set_object(ret, obj))

    goto err;

  if (!X509_EXTENSION_set_critical(ret, crit))

    goto err;

  if (!X509_EXTENSION_set_data(ret, data))

    goto err;

  if ((ex != NULL) && (*ex == NULL))

    *ex = ret;

  return (ret);

err:

  if ((ex == NULL) || (ret != *ex))

    X509_EXTENSION_free(ret);

  return (NULL);

}

int

X509_EXTENSION_set_object(X509_EXTENSION *ex, const ASN1_OBJECT *obj)

{

  if ((ex == NULL) || (obj == NULL))

    return (0);

  ASN1_OBJECT_free(ex->object);

  ex->object = OBJ_dup(obj);

  return ex->object != NULL;

}

int

X509_EXTENSION_set_critical(X509_EXTENSION *ex, int crit)

{

  if (ex == NULL)

    return (0);

  ex->critical = (crit) ? 0xFF : -1;

  return (1);

}

int

X509_EXTENSION_set_data(X509_EXTENSION *ex, ASN1_OCTET_STRING *data)

{

  int i;

  if (ex == NULL)

    return (0);

  i = ASN1_STRING_set(ex->value, data->data, data->length);

  if (!i)

    return (0);

  return (1);

}

ASN1_OBJECT *

X509_EXTENSION_get_object(X509_EXTENSION *ex)

{

  if (ex == NULL)

    return (NULL);

  return (ex->object);

}

ASN1_OCTET_STRING *

X509_EXTENSION_get_data(X509_EXTENSION *ex)

{

  if (ex == NULL)

    return (NULL);

  return (ex->value);

}

int

X509_EXTENSION_get_critical(const X509_EXTENSION *ex)

{

  if (ex == NULL)

    return (0);

  if (ex->critical > 0)

    return 1;

  return 0;

}