/* 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 <stdio.h>
#include <ctype.h>
#include "cryptlib.h"
#include <openssl/conf.h>
#include <openssl/x509.h>
#include <openssl/x509v3.h>

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(const char *ext, char *value, int crit, int type);
static char *conf_lhash_get_string(void *db, char *section, char *value);
static STACK *conf_lhash_get_section(void *db, char *section);
static X509_EXTENSION *do_ext_i2d(X509V3_EXT_METHOD *method, int ext_nid,
						 int crit, void *ext_struc);
/* LHASH *conf:  Config file    */
/* char *name:  Name    */
/* char *value:  Value    */
X509_EXTENSION *X509V3_EXT_conf(LHASH *conf, X509V3_CTX *ctx, char *name,
	     char *value)
{
	int crit;
	int ext_type;
	X509_EXTENSION *ret;
	crit = v3_check_critical(&value);
	if((ext_type = v3_check_generic(&value))) 
		return v3_generic_extension(name, value, crit, ext_type);
	ret = do_ext_conf(conf, ctx, OBJ_sn2nid(name), crit, value);
	if(!ret) {
		X509V3err(X509V3_F_X509V3_EXT_CONF,X509V3_R_ERROR_IN_EXTENSION);
		ERR_add_error_data(4,"name=", name, ", value=", value);
	}
	return ret;
}

/* LHASH *conf:  Config file    */
/* char *value:  Value    */
X509_EXTENSION *X509V3_EXT_conf_nid(LHASH *conf, X509V3_CTX *ctx, int ext_nid,
	     char *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);
}

/* LHASH *conf:  Config file    */
/* char *value:  Value    */
static X509_EXTENSION *do_ext_conf(LHASH *conf, X509V3_CTX *ctx, int ext_nid,
	     int crit, char *value)
{
	X509V3_EXT_METHOD *method;
	X509_EXTENSION *ext;
	STACK *nval;
	void *ext_struc;
	if(ext_nid == NID_undef) {
		X509V3err(X509V3_F_DO_EXT_CONF,X509V3_R_UNKNOWN_EXTENSION_NAME);
		return NULL;
	}
	if(!(method = X509V3_EXT_get_nid(ext_nid))) {
		X509V3err(X509V3_F_DO_EXT_CONF,X509V3_R_UNKNOWN_EXTENSION);
		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 if(method->r2i) {
		if(!ctx->db) {
			X509V3err(X509V3_F_X509V3_EXT_CONF,X509V3_R_NO_CONFIG_DATABASE);
			return NULL;
		}
		if(!(ext_struc = method->r2i(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;
	}

	ext  = do_ext_i2d(method, ext_nid, crit, ext_struc);
	method->ext_free(ext_struc);
	return ext;

}

static X509_EXTENSION *do_ext_i2d(X509V3_EXT_METHOD *method, int ext_nid,
						 int crit, void *ext_struc)
{
	unsigned char *ext_der, *p;
	int ext_len;
	ASN1_OCTET_STRING *ext_oct;
	X509_EXTENSION *ext;
	/* Convert internal representation to DER */
	ext_len = method->i2d(ext_struc, NULL);
	if(!(ext_der = Malloc(ext_len))) goto merr;
	p = ext_der;
	method->i2d(ext_struc, &p);
	if(!(ext_oct = ASN1_OCTET_STRING_new())) goto merr;
	ext_oct->data = ext_der;
	ext_oct->length = ext_len;
	
	ext = X509_EXTENSION_create_by_NID(NULL, ext_nid, crit, ext_oct);
	if(!ext) goto merr;
	ASN1_OCTET_STRING_free(ext_oct);

	return ext;

	merr:
	X509V3err(X509V3_F_DO_EXT_I2D,ERR_R_MALLOC_FAILURE);
	return NULL;

}

/* Given an internal structure, nid and critical flag create an extension */

X509_EXTENSION *X509V3_EXT_i2d(int ext_nid, int crit, void *ext_struc)
{
	X509V3_EXT_METHOD *method;
	if(!(method = X509V3_EXT_get_nid(ext_nid))) {
		X509V3err(X509V3_F_X509V3_EXT_I2D,X509V3_R_UNKNOWN_EXTENSION);
		return NULL;
	}
	return do_ext_i2d(method, ext_nid, crit, ext_struc);
}

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

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

/* Create a generic extension: for now just handle RAW type */
static X509_EXTENSION *v3_generic_extension(const 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(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;
}

/* Same as above but for a CRL */

int X509V3_EXT_CRL_add_conf(LHASH *conf, X509V3_CTX *ctx, char *section,
	     X509_CRL *crl)
{
	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(crl) X509_CRL_add_ext(crl, ext, -1);
		X509_EXTENSION_free(ext);
	}
	return 1;
}

/* Config database functions */

char * X509V3_get_string(X509V3_CTX *ctx, char *name, char *section)
{
	if(ctx->db_meth->get_string)
			return ctx->db_meth->get_string(ctx->db, name, section);
	return NULL;
}

STACK * X509V3_get_section(X509V3_CTX *ctx, char *section)
{
	if(ctx->db_meth->get_section)
			return ctx->db_meth->get_section(ctx->db, section);
	return NULL;
}

void X509V3_string_free(X509V3_CTX *ctx, char *str)
{
	if(!str) return;
	if(ctx->db_meth->free_string)
			ctx->db_meth->free_string(ctx->db, str);
}

void X509V3_section_free(X509V3_CTX *ctx, STACK *section)
{
	if(!section) return;
	if(ctx->db_meth->free_section)
			ctx->db_meth->free_section(ctx->db, section);
}

static char *conf_lhash_get_string(void *db, char *section, char *value)
{
	return CONF_get_string(db, section, value);
}

static STACK *conf_lhash_get_section(void *db, char *section)
{
	return CONF_get_section(db, section);
}

static X509V3_CONF_METHOD conf_lhash_method = {
conf_lhash_get_string,
conf_lhash_get_section,
NULL,
NULL
};

void X509V3_set_conf_lhash(X509V3_CTX *ctx, LHASH *lhash)
{
	ctx->db_meth = &conf_lhash_method;
	ctx->db = lhash;
}

void X509V3_set_ctx(X509V3_CTX *ctx, X509 *issuer, X509 *subj, X509_REQ *req,
	     X509_CRL *crl, int flags)
{
	ctx->issuer_cert = issuer;
	ctx->subject_cert = subj;
	ctx->crl = crl;
	ctx->subject_req = req;
	ctx->flags = flags;
}