/*	$OpenBSD: auth_none.c,v 1.11 2010/09/01 14:43:34 millert Exp $ */

/*
 * Copyright (c) 2010, Oracle America, Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * 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.
 *     * Neither the name of the "Oracle America, Inc." nor the names of its
 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *   "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
 *   COPYRIGHT HOLDER 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.
 */

/*
 * auth_none.c
 * Creates a client authentication handle for passing "null" 
 * credentials and verifiers to remote systems. 
 */

#include <stdlib.h>
#include <rpc/types.h>
#include <rpc/rpc.h>
#include <rpc/xdr.h>
#include <rpc/auth.h>
#define MAX_MARSHEL_SIZE 20

/*
 * Authenticator operations routines
 */
static void	authnone_destroy(struct __rpc_auth *);
static void	authnone_verf(struct __rpc_auth *);
static bool_t	authnone_validate(struct __rpc_auth *, struct opaque_auth *);
static bool_t	authnone_marshal(struct __rpc_auth *, XDR *);
static bool_t	authnone_refresh(struct __rpc_auth *);

static struct auth_ops ops = {
	authnone_verf,
	authnone_marshal,
	authnone_validate,
	authnone_refresh,
	authnone_destroy
};

static struct authnone_private {
	AUTH	no_client;
	char	marshalled_client[MAX_MARSHEL_SIZE];
	u_int	mcnt;
} *authnone_private;

AUTH *
authnone_create(void)
{
	struct authnone_private *ap = authnone_private;
	XDR xdr_stream;
	XDR *xdrs;

	if (ap == NULL) {
		ap = (struct authnone_private *)calloc(1, sizeof (*ap));
		if (ap == NULL)
			return (NULL);
		authnone_private = ap;
	}
	if (!ap->mcnt) {
		ap->no_client.ah_cred = ap->no_client.ah_verf = _null_auth;
		ap->no_client.ah_ops = &ops;
		xdrs = &xdr_stream;
		xdrmem_create(xdrs, ap->marshalled_client, (u_int)MAX_MARSHEL_SIZE,
		    XDR_ENCODE);
		(void)xdr_opaque_auth(xdrs, &ap->no_client.ah_cred);
		(void)xdr_opaque_auth(xdrs, &ap->no_client.ah_verf);
		ap->mcnt = XDR_GETPOS(xdrs);
		XDR_DESTROY(xdrs);
	}
	return (&ap->no_client);
}

/*ARGSUSED*/
static bool_t
authnone_marshal(AUTH *client, XDR *xdrs)
{
	struct authnone_private *ap = authnone_private;

	if (ap == NULL)
		return (0);
	return ((*xdrs->x_ops->x_putbytes)(xdrs,
	    ap->marshalled_client, ap->mcnt));
}

/*ARGSUSED*/
static void 
authnone_verf(struct __rpc_auth *none)
{
}

/*ARGSUSED*/
static bool_t
authnone_validate(struct __rpc_auth *none, struct opaque_auth *noauth)
{

	return (TRUE);
}

/*ARGSUSED*/
static bool_t
authnone_refresh(struct __rpc_auth *none)
{

	return (FALSE);
}

/*ARGSUSED*/
static void
authnone_destroy(struct __rpc_auth *none)
{
}