4.3BSD-UWisc/src/lib/libc/rpc/svc_auth.c

#if defined(LIBC_RCS) && !defined(lint)
static char rcs_id[] = 
	"$Header: svc_auth.c,v 1.2 86/09/08 14:49:40 tadl Exp $";
#endif
/*
 * RCS info
 *	$Locker:  $
 */
/* NFSSRC @(#)svc_auth.c	2.1 86/04/14 */
#if defined(SUN_SCCS) && !defined(lint)
static char sccsid[] = "@(#)svc_auth.c 1.1 86/02/03 Copyr 1984 Sun Micro";
#endif

/*
 * svc_auth.c, Server-side rpc authenticator interface.
 *
 * Copyright (C) 1984, Sun Microsystems, Inc.
 */

#ifdef KERNEL
#include "../h/param.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/svc_auth.h"
#else
#include "types.h"	/* <> */
#include <netinet/in.h>
#include "xdr.h"	/* <> */
#include "auth.h"	/* <> */
#include "clnt.h"	/* <> */
#include "rpc_msg.h"	/* <> */
#include "svc.h"	/* <> */
#include "svc_auth.h"	/* <> */
#endif

/*
 * 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)();
} 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.
 */
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) {
		return ((*(svcauthsw[cred_flavor].authenticator))(rqst, msg));
	}

	return (AUTH_REJECTEDCRED);
}

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

	return (AUTH_OK);
}