/* v3_conf.c */
/* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
 * project 1999.
 */
/* ====================================================================
 * Copyright (c) 1999 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).
 *
 */
/* extension creation utilities */

#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#include <pem.h>
#include <conf.h>
#include <err.h>
#include "x509v3.h"

#ifndef NOPROTO
static int v3_check_critical(char **value);
static int v3_check_generic(char **value);
static X509_EXTENSION *do_ext_conf(LHASH *conf, X509V3_CTX *ctx, int ext_nid, int crit, char *value);
static X509_EXTENSION *v3_generic_extension(char *ext, char *value, int crit, int type);
#else
static int v3_check_critical();
static int v3_check_generic();
static X509_EXTENSION *do_ext_conf();
static X509V3_EXTENSION *v3_generic_extension();
#endif

X509_EXTENSION *X509V3_EXT_conf(conf, ctx, name, value)
LHASH *conf;	/* Config file */
X509V3_CTX *ctx;
char *name;	/* Name */
char *value;	/* Value */
{
	int crit;
	int ext_type;
	crit = v3_check_critical(&value);
	if((ext_type = v3_check_generic(&value))) 
		return v3_generic_extension(name, value, crit, ext_type);
	return do_ext_conf(conf, ctx, OBJ_sn2nid(name), crit, value);
}

X509_EXTENSION *X509V3_EXT_conf_nid(conf, ctx, ext_nid, value)
LHASH *conf;	/* Config file */
X509V3_CTX *ctx;
int ext_nid;
char *value;	/* Value */
{
	int crit;
	int ext_type;
	crit = v3_check_critical(&value);
	if((ext_type = v3_check_generic(&value))) 
		return v3_generic_extension(OBJ_nid2sn(ext_nid),
							 value, crit, ext_type);
	return do_ext_conf(conf, ctx, ext_nid, crit, value);
}

static X509_EXTENSION *do_ext_conf(conf, ctx, ext_nid, crit, value)
LHASH *conf;	/* Config file */
X509V3_CTX *ctx;
int ext_nid;
int crit;
char *value;	/* Value */
{
	X509_EXTENSION *ext = NULL;
	X509V3_EXT_METHOD *method;
	STACK *nval;
	char *ext_struc;
	char *ext_der, *p;
	int ext_len;
	ASN1_OCTET_STRING *ext_oct;
	if(ext_nid == NID_undef) return NULL;
	if(!(method = X509V3_EXT_get_nid(ext_nid))) {
		/* Add generic extension support here */
		return NULL;
	}
	/* Now get internal extension representation based on type */
	if(method->v2i) {
		if(*value == '@') nval = CONF_get_section(conf, value + 1);
		else nval = X509V3_parse_list(value);
		if(!nval) {
			X509V3err(X509V3_F_X509V3_EXT_CONF,X509V3_R_INVALID_EXTENSION_STRING);
			ERR_add_error_data(4, "name=", OBJ_nid2sn(ext_nid), ",section=", value);
			return NULL;
		}
		ext_struc = method->v2i(method, ctx, nval);
		if(*value != '@') sk_pop_free(nval, X509V3_conf_free);
		if(!ext_struc) return NULL;
	} else if(method->s2i) {
		if(!(ext_struc = method->s2i(method, ctx, value))) return NULL;
	} else {
		X509V3err(X509V3_F_X509V3_EXT_CONF,X509V3_R_EXTENSION_SETTING_NOT_SUPPORTED);
		ERR_add_error_data(2, "name=", OBJ_nid2sn(ext_nid));
		return NULL;
	}

	/* We've now got the internal representation: convert to DER */
	ext_len = method->i2d(ext_struc, NULL);
	ext_der = Malloc(ext_len);
	p = ext_der;
	method->i2d(ext_struc, &p);
	method->ext_free(ext_struc);
	ext_oct = ASN1_OCTET_STRING_new();
	ext_oct->data = ext_der;
	ext_oct->length = ext_len;
	
	ext = X509_EXTENSION_create_by_NID(NULL, ext_nid, crit, ext_oct);
	ASN1_OCTET_STRING_free(ext_oct);

	return ext;

}

/* Check the extension string for critical flag */
static int v3_check_critical(value)
char **value;
{
	char *p = *value;
	if((strlen(p) < 9) || strncmp(p, "critical,", 9)) return 0;
	p+=9;
	while(isspace(*p)) p++;
	*value = p;
	return 1;
}

/* Check extension string for generic extension and return the type */
static int v3_check_generic(value)
char **value;
{
	char *p = *value;
	if((strlen(p) < 4) || strncmp(p, "RAW:,", 4)) return 0;
	p+=4;
	while(isspace(*p)) p++;
	*value = p;
	return 1;
}

/* Create a generic extension: for now just handle RAW type */
static X509_EXTENSION *v3_generic_extension(ext, value, crit, type)
char *ext;
char *value;
int crit;
int type;
{
unsigned char *ext_der=NULL;
long ext_len;
ASN1_OBJECT *obj=NULL;
ASN1_OCTET_STRING *oct=NULL;
X509_EXTENSION *extension=NULL;
if(!(obj = OBJ_txt2obj(ext, 0))) {
	X509V3err(X509V3_F_V3_GENERIC_EXTENSION,X509V3_R_EXTENSION_NAME_ERROR);
	ERR_add_error_data(2, "name=", ext);
	goto err;
}

if(!(ext_der = string_to_hex(value, &ext_len))) {
	X509V3err(X509V3_F_V3_GENERIC_EXTENSION,X509V3_R_EXTENSION_VALUE_ERROR);
	ERR_add_error_data(2, "value=", value);
	goto err;
}

if(!(oct = ASN1_OCTET_STRING_new())) {
	X509V3err(X509V3_F_V3_GENERIC_EXTENSION,ERR_R_MALLOC_FAILURE);
	goto err;
}

oct->data = ext_der;
oct->length = ext_len;
ext_der = NULL;

extension = X509_EXTENSION_create_by_OBJ(NULL, obj, crit, oct);

err:
ASN1_OBJECT_free(obj);
ASN1_OCTET_STRING_free(oct);
if(ext_der) Free(ext_der);
return extension;
}


/* This is the main function: add a bunch of extensions based on a config file
 * section
 */

int X509V3_EXT_add_conf(conf, ctx, section, cert)
LHASH *conf;
X509V3_CTX *ctx;
char *section;
X509 *cert;
{
	X509_EXTENSION *ext;
	STACK *nval;
	CONF_VALUE *val;	
	int i;
	if(!(nval = CONF_get_section(conf, section))) return 0;
	for(i = 0; i < sk_num(nval); i++) {
		val = (CONF_VALUE *)sk_value(nval, i);
		if(!(ext = X509V3_EXT_conf(conf, ctx, val->name, val->value)))
								return 0;
		if(cert) X509_add_ext(cert, ext, -1);
		X509_EXTENSION_free(ext);
	}
	return 1;
}

/* Just check syntax of config file as far as possible */
int X509V3_EXT_check_conf(conf, section)
LHASH *conf;
char *section;
{
	static X509V3_CTX ctx_tst = { CTX_TEST, NULL, NULL, NULL, NULL };
	return X509V3_EXT_add_conf(conf, &ctx_tst, section, NULL);
}