/* $Copyright:	$
 * Copyright (c) 1984, 1985, 1986, 1987, 1988, 1989, 1990 
 * Sequent Computer Systems, Inc.   All rights reserved.
 *  
 * This software is furnished under a license and may be used
 * only in accordance with the terms of that license and with the
 * inclusion of the above copyright notice.   This software may not
 * be provided or otherwise made available to, or used by, any
 * other person.  No title to or ownership of the software is
 * hereby transferred.
 */

#ifdef	NFS

#ifndef	lint
static	char	rcsid[] = "$Header: svc_auth_unix.c 1.2 87/05/05 $";
#endif	lint

/*
 * svc_auth_unix.c
 *     Handles UNIX flavor authentication parameters on the service side of rpc.
 * There are two svc auth implementations here: AUTH_UNIX and AUTH_SHORT.
 * _svcauth_unix does full blown unix style uid,gid+gids auth,
 * _svcauth_short uses a shorthand auth to index into a cache of longhand auths.
 * Note: the shorthand has been gutted for efficiency.
 *
 * Copyright (C) 1984, Sun Microsystems, Inc.
 */

/* $Log:	svc_auth_unix.c,v $
 */

#include "../h/param.h"
#include "../h/time.h"
#include "../h/kernel.h"
#include "../netinet/in.h"
#include "../rpc/types.h"
#include "../rpc/xdr.h"
#include "../rpc/auth.h"
#include "../rpc/clnt.h"
#include "../rpc/rpc_msg.h"
#include "../rpc/svc.h"
#include "../rpc/auth_unix.h"
#include "../rpc/svc_auth.h"

#define	RNDUP(x)  ((((x) + BYTES_PER_XDR_UNIT - 1) / BYTES_PER_XDR_UNIT) \
		   * BYTES_PER_XDR_UNIT)

/*
 * Unix longhand authenticator
 */
enum auth_stat
_svcauth_unix(rqst, msg)
	register struct svc_req *rqst;
	struct rpc_msg *msg;
{
	register struct authunix_parms *aup;
	register long *buf;
	register int i;
	enum auth_stat stat;
	u_int	auth_len;
	int	str_len, gid_len;
	XDR xdrs;
	struct area {
		struct authunix_parms area_aup;
		char area_machname[MAX_MACHINE_NAME];
		int area_gids[NGRPS];
	} *area;

	area = (struct area *)rqst->rq_clntcred;
	aup = &area->area_aup;
	aup->aup_machname = area->area_machname;
	aup->aup_gids = area->area_gids;
	auth_len = (u_int)msg->rm_call.cb_cred.oa_length;
	xdrmem_create(&xdrs, msg->rm_call.cb_cred.oa_base, auth_len,XDR_DECODE);
	buf = XDR_INLINE(&xdrs, auth_len);
	if (buf != NULL) {
		aup->aup_time = IXDR_GET_LONG(buf);
		str_len = IXDR_GET_U_LONG(buf);
		bcopy((char *)buf, aup->aup_machname, (unsigned)str_len);
		aup->aup_machname[str_len] = 0;
		str_len = RNDUP(str_len);
		buf += str_len / sizeof(long);
		aup->aup_uid = IXDR_GET_LONG(buf);
		aup->aup_gid = IXDR_GET_LONG(buf);
		gid_len = IXDR_GET_U_LONG(buf);
		if (gid_len > NGRPS) {
			stat = AUTH_BADCRED;
			goto done;
		}
		aup->aup_len = gid_len;
		for (i = 0; i < gid_len; i++) {
			aup->aup_gids[i] = IXDR_GET_LONG(buf);
		}
		/*
		 * five is the smallest unix credentials structure -
		 * timestamp, hostname len (0), uid, gid, and gids len (0).
		 */
		if ((5 + gid_len) * BYTES_PER_XDR_UNIT + str_len > auth_len) {
			printf("bad auth_len gid %d str %d auth %d\n",
			       gid_len, str_len, auth_len);
			stat = AUTH_BADCRED;
			goto done;
		}
	} else if (! xdr_authunix_parms(&xdrs, aup)) {
		xdrs.x_op = XDR_FREE;
		(void)xdr_authunix_parms(&xdrs, aup);
		stat = AUTH_BADCRED;
		goto done;
	}
	rqst->rq_xprt->xp_verf.oa_flavor = AUTH_NULL;
	rqst->rq_xprt->xp_verf.oa_length = 0;
	stat = AUTH_OK;
done:
	XDR_DESTROY(&xdrs);
	return (stat);
}


/*
 * Shorthand unix authenticator
 * Looks up longhand in a cache.
 */
/*ARGSUSED*/
enum auth_stat 
_svcauth_short(rqst, msg)
	struct svc_req *rqst;
	struct rpc_msg *msg;
{
	return (AUTH_REJECTEDCRED);
}
#endif	NFS
