svc_auth.c

操作系统SunOS 4.1.3版本的源码

#if !defined(lint) && defined(SCCSIDS)
static char sccsid[] = "@(#)svc_auth.c 1.1 92/07/30 Copyr 1984 Sun Micro";
#endif

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

#ifdef KERNEL
#include <sys/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 <rpc/rpc.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 */
enum auth_stat _svcauth_des();		/* des style */

/*
 * 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;
	switch (cred_flavor) {
	case AUTH_NULL:
		return (_svcauth_null(rqst, msg));
	case AUTH_UNIX:
		return (_svcauth_unix(rqst, msg));
	case AUTH_SHORT:
		return (_svcauth_short(rqst, msg));
	case AUTH_DES:
		return (_svcauth_des(rqst, msg));
	}
	return (AUTH_REJECTEDCRED);
}

/*ARGSUSED*/
enum auth_stat
_svcauth_null(rqst, msg)
	struct svc_req *rqst;
	struct rpc_msg *msg;
{
	return (AUTH_OK);
}