/*
 * GPL HEADER START
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 only,
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License version 2 for more details (a copy is included
 * in the LICENSE file that accompanied this code).
 *
 * You should have received a copy of the GNU General Public License
 * version 2 along with this program; If not, see
 * http://www.gnu.org/licenses/gpl-2.0.html
 *
 * GPL HEADER END
 */
/*
 * Copyright (C) 2015, Trustees of Indiana University
 *
 * Author: Jeremy Filizetti <jfilizet@iu.edu>
 */

#include <string.h>
#include <time.h>
#include <libcfs/byteorder.h>
#include "lgss_utils.h"

static int lgss_null_prepare_cred(struct lgss_cred *cred)
{
	uint64_t tmp;

	cred->lc_mech_token.value = malloc(sizeof(uint64_t));
	if (!cred->lc_mech_token.value)
		return -1;
	cred->lc_mech_token.length = sizeof(uint64_t);

	/* random token so it's not cached by the other side */
	tmp = random();
	tmp <<= 32;

	/* Sec part flags needed on the other end */
	tmp |= cred->lc_root_flags;

	/* big-endian for the wire */
	tmp = cpu_to_be64(tmp);
	memcpy(cred->lc_mech_token.value, &tmp, cred->lc_mech_token.length);

	return 0;
}

static void lgss_null_release_cred(struct lgss_cred *cred)
{
	free(cred->lc_mech_token.value);
}

static int lgss_null_validate_cred(struct lgss_cred *cred,
				   gss_buffer_desc *token,
				   gss_buffer_desc *ctx_token)
{
	if (token->length <= 0)
		return -1;

	ctx_token->length = token->length;
	ctx_token->value = malloc(ctx_token->length);
	memcpy(ctx_token->value, token->value, ctx_token->length);

	return 0;
}
struct lgss_mech_type lgss_mech_null = {
	.lmt_name		= "gssnull",
	.lmt_mech_n		= LGSS_MECH_NULL,
	.lmt_prepare_cred	= lgss_null_prepare_cred,
	.lmt_release_cred	= lgss_null_release_cred,
	.lmt_validate_cred	= lgss_null_validate_cred,
};