/* $OpenBSD: x509_v3.c,v 1.13 2016/03/21 04:05:33 mmcc 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>

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, 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) {
		X509err(X509_F_X509V3_ADD_EXT, 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:
	X509err(X509_F_X509V3_ADD_EXT, 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) {
		X509err(X509_F_X509_EXTENSION_CREATE_BY_NID,
		    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, ASN1_OBJECT *obj, int crit,
    ASN1_OCTET_STRING *data)
{
	X509_EXTENSION *ret;

	if ((ex == NULL) || (*ex == NULL)) {
		if ((ret = X509_EXTENSION_new()) == NULL) {
			X509err(X509_F_X509_EXTENSION_CREATE_BY_OBJ,
			    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, 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(X509_EXTENSION *ex)
{
	if (ex == NULL)
		return (0);
	if (ex->critical > 0)
		return 1;
	return 0;
}