/*
 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
 * unrestricted use provided that this legend is included on all tape
 * media and as a part of the software program in whole or part.  Users
 * may copy or modify Sun RPC without charge, but are not authorized
 * to license or distribute it to anyone else except as part of a product or
 * program developed by the user.
 * 
 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
 * 
 * Sun RPC is provided with no support and without any obligation on the
 * part of Sun Microsystems, Inc. to assist in its use, correction,
 * modification or enhancement.
 *
 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
 * OR ANY PART THEREOF.
 *
 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
 * or profits or other special, indirect and consequential damages, even if
 * Sun has been advised of the possibility of such damages.
 *
 * Sun Microsystems, Inc.
 * 2550 Garcia Avenue
 * Mountain View, California  94043
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char *rcsid = "$OpenBSD: svc_auth.c,v 1.6 2005/04/01 07:44:04 otto Exp $";
#endif /* LIBC_SCCS and not lint */

/*
 * svc_auth_nodes.c, Server-side rpc authenticator interface,
 * *WITHOUT* DES authentication.
 *
 * Copyright (C) 1984, Sun Microsystems, Inc.
 */

#include <rpc/rpc.h>

/*
 * svcauthsw is the bdevsw of server side authentication. 
 * 
 * Server side authenticators are called from authenticate by
 * using the client auth struct flavor field to index into svcauthsw.
 * The server auth flavors must implement a routine that looks  
 * like: 
 * 
 *	enum auth_stat
 *	flavorx_auth(rqst, msg)
 *		struct svc_req *rqst; 
 *		struct rpc_msg *msg;
 *
 */

/* no authentication */
enum auth_stat _svcauth_null(void);
/* unix style (uid, gids) */
enum auth_stat _svcauth_unix(struct svc_req *rqst, struct rpc_msg *msg);
/* short hand unix style */
enum auth_stat _svcauth_short(struct svc_req *rqst, struct rpc_msg *msg);

static struct {
	enum auth_stat (*authenticator)();
} svcauthsw[] = {
	{ _svcauth_null },		/* AUTH_NULL */
	{ _svcauth_unix },		/* AUTH_UNIX */
	{ _svcauth_short }		/* AUTH_SHORT */
};
#define	AUTH_MAX	2		/* HIGHEST AUTH NUMBER */


/*
 * The call rpc message, msg has been obtained from the wire.  The msg contains
 * the raw form of credentials and verifiers.  authenticate returns AUTH_OK
 * if the msg is successfully authenticated.  If AUTH_OK then the routine also
 * does the following things:
 * set rqst->rq_xprt->verf to the appropriate response verifier;
 * sets rqst->rq_client_cred to the "cooked" form of the credentials.
 *
 * NB: rqst->rq_cxprt->verf must be pre-alloctaed;
 * its length is set appropriately.
 *
 * The caller still owns and is responsible for msg->u.cmb.cred and
 * msg->u.cmb.verf.  The authentication system retains ownership of
 * rqst->rq_client_cred, the cooked credentials.
 *
 * There is an assumption that any flavour less than AUTH_NULL is
 * invalid.
 */
enum auth_stat
_authenticate(struct svc_req *rqst, struct rpc_msg *msg)
{
	int cred_flavor;

	rqst->rq_cred = msg->rm_call.cb_cred;
	rqst->rq_xprt->xp_verf.oa_flavor = _null_auth.oa_flavor;
	rqst->rq_xprt->xp_verf.oa_length = 0;
	cred_flavor = rqst->rq_cred.oa_flavor;
	if ((cred_flavor <= AUTH_MAX) && (cred_flavor >= AUTH_NULL)) {
		return ((*(svcauthsw[cred_flavor].authenticator))(rqst, msg));
	}

	return (AUTH_REJECTEDCRED);
}

enum auth_stat
_svcauth_null(void)
	/*struct svc_req *rqst;
	struct rpc_msg *msg;*/
{

	return (AUTH_OK);
}