OpenSolaris_b135/lib/libnsl/rpc/svc_auth.c
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2005 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
/*
* Portions of this source code were derived from Berkeley
* 4.3 BSD under license from the Regents of the University of
* California.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
/*
* svc_auth.c, Server-side rpc authenticator interface.
*
*/
#include "mt.h"
#include "rpc_mt.h"
#include <rpc/rpc.h>
#include <sys/types.h>
#include <stdlib.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;
*
* The RPCSEC_GSS flavor is an exception. Its routine takes an
* additional boolean parameter that gets set to TRUE when the call
* is not to be dispatched to the server.
*/
enum auth_stat __svcauth_null(); /* no authentication */
enum auth_stat __svcauth_sys(); /* (system) unix style (uid, gids) */
enum auth_stat __svcauth_short(); /* short hand unix style */
enum auth_stat __svcauth_des(); /* des style */
enum auth_stat __svcauth_loopback(); /* (loopback) unix style (uid, gids) */
extern enum auth_stat __svcrpcsec_gss(); /* GSS style */
/* declarations to allow servers to specify new authentication flavors */
struct authsvc {
int flavor;
enum auth_stat (*handler)();
struct authsvc *next;
};
static struct authsvc *Auths = NULL;
/*
* The call rpc message, msg has been obtained from the wire. The msg contains
* the raw form of credentials and verifiers. no_dispatch is used and
* dereferenced in subsequent gss function calls. 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
__gss_authenticate(struct svc_req *rqst, struct rpc_msg *msg,
bool_t *no_dispatch)
{
int cred_flavor;
struct authsvc *asp;
extern mutex_t authsvc_lock;
/* VARIABLES PROTECTED BY authsvc_lock: asp, Auths */
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;
*no_dispatch = FALSE;
switch (cred_flavor) {
case AUTH_NULL:
return (__svcauth_null(rqst, msg));
case AUTH_SYS:
return (__svcauth_sys(rqst, msg));
case AUTH_SHORT:
return (__svcauth_short(rqst, msg));
case AUTH_DES:
return (__svcauth_des(rqst, msg));
case AUTH_LOOPBACK:
return (__svcauth_loopback(rqst, msg));
case RPCSEC_GSS:
return (__svcrpcsec_gss(rqst, msg, no_dispatch));
}
/* flavor doesn't match any of the builtin types, so try new ones */
(void) mutex_lock(&authsvc_lock);
for (asp = Auths; asp; asp = asp->next) {
if (asp->flavor == cred_flavor) {
enum auth_stat as;
as = (*asp->handler)(rqst, msg);
(void) mutex_unlock(&authsvc_lock);
return (as);
}
}
(void) mutex_unlock(&authsvc_lock);
return (AUTH_REJECTEDCRED);
}
/*
* The following function __authenticate(rqst, msg) is preserved for
* backward compatibility.
*/
enum auth_stat
__authenticate(struct svc_req *rqst, struct rpc_msg *msg)
{
bool_t no_dispatch;
return (__gss_authenticate(rqst, msg, &no_dispatch));
}
/*ARGSUSED*/
enum auth_stat
__svcauth_null(struct svc_req *rqst, struct rpc_msg *msg)
{
return (AUTH_OK);
}
/*
* Allow the rpc service to register new authentication types that it is
* prepared to handle. When an authentication flavor is registered,
* the flavor is checked against already registered values. If not
* registered, then a new Auths entry is added on the list.
*
* There is no provision to delete a registration once registered.
*
* This routine returns:
* 0 if registration successful
* 1 if flavor already registered
* -1 if can't register (errno set)
*/
int
svc_auth_reg(int cred_flavor, enum auth_stat (*handler)())
{
struct authsvc *asp;
extern mutex_t authsvc_lock;
switch (cred_flavor) {
case AUTH_NULL:
case AUTH_SYS:
case AUTH_SHORT:
case AUTH_DES:
case AUTH_LOOPBACK:
case RPCSEC_GSS:
/* already registered */
return (1);
}
(void) mutex_lock(&authsvc_lock);
for (asp = Auths; asp; asp = asp->next) {
if (asp->flavor == cred_flavor) {
/* already registered */
(void) mutex_unlock(&authsvc_lock);
return (1);
}
}
/* this is a new one, so go ahead and register it */
asp = malloc(sizeof (*asp));
if (asp == NULL) {
(void) mutex_unlock(&authsvc_lock);
return (-1);
}
asp->flavor = cred_flavor;
asp->handler = handler;
asp->next = Auths;
Auths = asp;
(void) mutex_unlock(&authsvc_lock);
return (0);
}