/*
 *      $Id: svc_auth.c,v 4.2 1994/09/29 23:48:50 jraja Exp $
 *
 *      Server-side rpc authenticator interface, *WITHOUT* DES authentication.
 *
 *      Copyright © 1994 AmiTCP/IP Group,
 *                       Network Solutions Development Inc.
 *                       All rights reserved. 
 */

#if !defined(lint) && defined(SCCSIDS)
static char sccsid[] = "@(#)svc_auth.c	2.1 88/08/07 4.0 RPCSRC; from 1.19 87/08/11 Copyr 1984 Sun Micro";
#endif

/*
 * Copyright (C) 1984, Sun Microsystems, Inc.
 */

#include <sys/param.h>
#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)
 *		register struct svc_req *rqst; 
 *		register struct rpc_msg *msg;
 *
 */

enum auth_stat _svcauth_null();		/* no authentication */
enum auth_stat _svcauth_unix();		/* unix style (uid, gids) */
enum auth_stat _svcauth_short();	/* short hand unix style */

static struct {
	enum auth_stat (*authenticator)(struct svc_req *, struct rpc_msg *);
} 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(rqst, msg)
	register struct svc_req *rqst;
	struct rpc_msg *msg;
{
	register 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(struct svc_req *rqst, struct rpc_msg *msg)
{
	return (AUTH_OK);
}