/* $NetBSD: svc_auth.c,v 1.19 2024/01/23 17:24:38 christos Exp $ */ /* * Copyright (c) 2010, Oracle America, Inc. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are * met: * * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following * disclaimer in the documentation and/or other materials * provided with the distribution. * * Neither the name of the "Oracle America, Inc." nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ /* * Copyright (c) 1986-1991 by Sun Microsystems Inc. */ /* #ident "@(#)svc_auth.c 1.16 94/04/24 SMI" */ #include <sys/cdefs.h> #if defined(LIBC_SCCS) && !defined(lint) #if 0 static char sccsid[] = "@(#)svc_auth.c 1.26 89/02/07 Copyr 1984 Sun Micro"; #else __RCSID("$NetBSD: svc_auth.c,v 1.19 2024/01/23 17:24:38 christos Exp $"); #endif #endif /* * svc_auth.c, Server-side rpc authenticator interface. * */ #include "namespace.h" #include "reentrant.h" #include <sys/types.h> #include <rpc/rpc.h> #include <assert.h> #include <stdlib.h> #include "rpc_internal.h" #ifdef __weak_alias __weak_alias(svc_auth_reg,_svc_auth_reg) #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) * struct svc_req *rqst; * struct rpc_msg *msg; * */ /* declarations to allow servers to specify new authentication flavors */ struct authsvc { int flavor; enum auth_stat (*handler)(struct svc_req *, struct rpc_msg *); 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. 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-allocated; * 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(struct svc_req *rqst, struct rpc_msg *msg) { int cred_flavor; struct authsvc *asp; enum auth_stat dummy; _DIAGASSERT(rqst != NULL); _DIAGASSERT(msg != NULL); /* 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; switch (cred_flavor) { case AUTH_NULL: dummy = _svcauth_null(rqst, msg); return (dummy); case AUTH_SYS: dummy = _svcauth_unix(rqst, msg); return (dummy); case AUTH_SHORT: dummy = _svcauth_short(rqst, msg); return (dummy); #if 0 case AUTH_DES: dummy = __svcauth_des(rqst, msg); return (dummy); #endif default: break; } /* flavor doesn't match any of the builtin types, so try new ones */ 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); mutex_unlock(&authsvc_lock); return (as); } } mutex_unlock(&authsvc_lock); return (AUTH_REJECTEDCRED); } /*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 svc_req *, struct rpc_msg *)) { struct authsvc *asp; switch (cred_flavor) { case AUTH_NULL: case AUTH_SYS: case AUTH_SHORT: #if 0 case AUTH_DES: #endif /* already registered */ return (1); default: mutex_lock(&authsvc_lock); for (asp = Auths; asp; asp = asp->next) { if (asp->flavor == cred_flavor) { /* already registered */ mutex_unlock(&authsvc_lock); return (1); } } /* this is a new one, so go ahead and register it */ asp = mem_alloc(sizeof (*asp)); if (asp == NULL) { mutex_unlock(&authsvc_lock); return (-1); } asp->flavor = cred_flavor; asp->handler = handler; asp->next = Auths; Auths = asp; mutex_unlock(&authsvc_lock); break; } return (0); }
