227 lines
6.4 KiB
C
227 lines
6.4 KiB
C
/* $NetBSD: svc_auth.c,v 1.12 2000/07/06 03:10:35 christos Exp $ */
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/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 2009, Sun Microsystems, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* - Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* - Neither the name of Sun Microsystems, Inc. nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Copyright (c) 1986-1991 by Sun Microsystems Inc.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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#ident "@(#)svc_auth.c 1.16 94/04/24 SMI"
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static char sccsid[] = "@(#)svc_auth.c 1.26 89/02/07 Copyr 1984 Sun Micro";
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#endif
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* svc_auth.c, Server-side rpc authenticator interface.
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*
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*/
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#include "namespace.h"
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#include "reentrant.h"
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#include <sys/types.h>
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#include <rpc/rpc.h>
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#include <stdlib.h>
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#include "un-namespace.h"
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#include "mt_misc.h"
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/*
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* svcauthsw is the bdevsw of server side authentication.
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*
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* Server side authenticators are called from authenticate by
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* using the client auth struct flavor field to index into svcauthsw.
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* The server auth flavors must implement a routine that looks
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* like:
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*
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* enum auth_stat
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* flavorx_auth(rqst, msg)
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* struct svc_req *rqst;
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* struct rpc_msg *msg;
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*
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*/
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/* declarations to allow servers to specify new authentication flavors */
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struct authsvc {
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int flavor;
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enum auth_stat (*handler)(struct svc_req *, struct rpc_msg *);
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struct authsvc *next;
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};
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static struct authsvc *Auths = NULL;
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struct svc_auth_ops svc_auth_null_ops;
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/*
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* The call rpc message, msg has been obtained from the wire. The msg contains
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* the raw form of credentials and verifiers. authenticate returns AUTH_OK
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* if the msg is successfully authenticated. If AUTH_OK then the routine also
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* does the following things:
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* set rqst->rq_xprt->verf to the appropriate response verifier;
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* sets rqst->rq_client_cred to the "cooked" form of the credentials.
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*
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* NB: rqst->rq_cxprt->verf must be pre-allocated;
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* its length is set appropriately.
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*
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* The caller still owns and is responsible for msg->u.cmb.cred and
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* msg->u.cmb.verf. The authentication system retains ownership of
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* rqst->rq_client_cred, the cooked credentials.
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*
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* There is an assumption that any flavour less than AUTH_NULL is
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* invalid.
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*/
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enum auth_stat
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_authenticate(struct svc_req *rqst, struct rpc_msg *msg)
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{
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int cred_flavor;
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struct authsvc *asp;
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enum auth_stat dummy;
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/* VARIABLES PROTECTED BY authsvc_lock: asp, Auths */
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rqst->rq_cred = msg->rm_call.cb_cred;
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SVC_AUTH(rqst->rq_xprt).svc_ah_ops = &svc_auth_null_ops;
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SVC_AUTH(rqst->rq_xprt).svc_ah_private = NULL;
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rqst->rq_xprt->xp_verf.oa_flavor = _null_auth.oa_flavor;
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rqst->rq_xprt->xp_verf.oa_length = 0;
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cred_flavor = rqst->rq_cred.oa_flavor;
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switch (cred_flavor) {
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case AUTH_NULL:
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dummy = _svcauth_null(rqst, msg);
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return (dummy);
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case AUTH_SYS:
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dummy = _svcauth_unix(rqst, msg);
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return (dummy);
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case AUTH_SHORT:
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dummy = _svcauth_short(rqst, msg);
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return (dummy);
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#ifdef DES_BUILTIN
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case AUTH_DES:
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dummy = _svcauth_des(rqst, msg);
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return (dummy);
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#endif
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default:
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break;
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}
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/* flavor doesn't match any of the builtin types, so try new ones */
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mutex_lock(&authsvc_lock);
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for (asp = Auths; asp; asp = asp->next) {
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if (asp->flavor == cred_flavor) {
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enum auth_stat as;
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as = (*asp->handler)(rqst, msg);
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mutex_unlock(&authsvc_lock);
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return (as);
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}
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}
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mutex_unlock(&authsvc_lock);
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return (AUTH_REJECTEDCRED);
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}
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/*
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* A set of null auth methods used by any authentication protocols
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* that don't need to inspect or modify the message body.
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*/
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static bool_t
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svcauth_null_wrap(SVCAUTH *auth, XDR *xdrs, xdrproc_t xdr_func, caddr_t xdr_ptr)
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{
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return (xdr_func(xdrs, xdr_ptr));
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}
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struct svc_auth_ops svc_auth_null_ops = {
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svcauth_null_wrap,
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svcauth_null_wrap,
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};
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/*ARGSUSED*/
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enum auth_stat
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_svcauth_null(struct svc_req *rqst, struct rpc_msg *msg)
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{
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return (AUTH_OK);
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}
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/*
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* Allow the rpc service to register new authentication types that it is
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* prepared to handle. When an authentication flavor is registered,
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* the flavor is checked against already registered values. If not
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* registered, then a new Auths entry is added on the list.
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*
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* There is no provision to delete a registration once registered.
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*
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* This routine returns:
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* 0 if registration successful
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* 1 if flavor already registered
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* -1 if can't register (errno set)
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*/
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int
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svc_auth_reg(int cred_flavor,
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enum auth_stat (*handler)(struct svc_req *, struct rpc_msg *))
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{
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struct authsvc *asp;
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switch (cred_flavor) {
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case AUTH_NULL:
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case AUTH_SYS:
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case AUTH_SHORT:
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#ifdef DES_BUILTIN
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case AUTH_DES:
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#endif
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/* already registered */
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return (1);
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default:
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mutex_lock(&authsvc_lock);
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for (asp = Auths; asp; asp = asp->next) {
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if (asp->flavor == cred_flavor) {
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/* already registered */
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mutex_unlock(&authsvc_lock);
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return (1);
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}
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}
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/* this is a new one, so go ahead and register it */
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asp = mem_alloc(sizeof (*asp));
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if (asp == NULL) {
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mutex_unlock(&authsvc_lock);
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return (-1);
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}
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asp->flavor = cred_flavor;
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asp->handler = handler;
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asp->next = Auths;
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Auths = asp;
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mutex_unlock(&authsvc_lock);
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break;
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}
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return (0);
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}
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