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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/*
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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 <sys/param.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/systm.h>
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#include <sys/jail.h>
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#include <sys/ucred.h>
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#include <rpc/rpc.h>
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#include <rpc/rpcsec_tls.h>
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static enum auth_stat (*_svcauth_rpcsec_gss)(struct svc_req *,
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struct rpc_msg *) = NULL;
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static int (*_svcauth_rpcsec_gss_getcred)(struct svc_req *,
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struct ucred **, int *);
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static const 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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enum auth_stat dummy;
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rqst->rq_cred = msg->rm_call.cb_cred;
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rqst->rq_auth.svc_ah_ops = &svc_auth_null_ops;
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rqst->rq_auth.svc_ah_private = NULL;
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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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if ((rqst->rq_xprt->xp_tls & RPCTLS_FLAGS_DISABLED) != 0)
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return (AUTH_REJECTEDCRED);
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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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if ((rqst->rq_xprt->xp_tls & RPCTLS_FLAGS_DISABLED) != 0)
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return (AUTH_REJECTEDCRED);
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dummy = _svcauth_short(rqst, msg);
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return (dummy);
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case RPCSEC_GSS:
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if ((rqst->rq_xprt->xp_tls & RPCTLS_FLAGS_DISABLED) != 0)
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return (AUTH_REJECTEDCRED);
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if (!_svcauth_rpcsec_gss)
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return (AUTH_REJECTEDCRED);
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dummy = _svcauth_rpcsec_gss(rqst, msg);
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return (dummy);
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case AUTH_TLS:
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dummy = _svcauth_rpcsec_tls(rqst, msg);
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return (dummy);
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default:
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break;
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}
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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, struct mbuf **mp)
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{
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return (TRUE);
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}
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static bool_t
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svcauth_null_unwrap(SVCAUTH *auth, struct mbuf **mp)
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{
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return (TRUE);
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}
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static void
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svcauth_null_release(SVCAUTH *auth)
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{
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}
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static const struct svc_auth_ops svc_auth_null_ops = {
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.svc_ah_wrap = svcauth_null_wrap,
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.svc_ah_unwrap = svcauth_null_unwrap,
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.svc_ah_release = svcauth_null_release,
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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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rqst->rq_verf = _null_auth;
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return (AUTH_OK);
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}
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int
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svc_auth_reg(int flavor,
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enum auth_stat (*svcauth)(struct svc_req *, struct rpc_msg *),
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int (*getcred)(struct svc_req *, struct ucred **, int *))
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{
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if (flavor == RPCSEC_GSS) {
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_svcauth_rpcsec_gss = svcauth;
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_svcauth_rpcsec_gss_getcred = getcred;
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}
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return (TRUE);
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}
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int
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svc_getcred(struct svc_req *rqst, struct ucred **crp, int *flavorp)
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{
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struct ucred *cr = NULL;
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int flavor;
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struct xucred *xcr;
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SVCXPRT *xprt = rqst->rq_xprt;
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flavor = rqst->rq_cred.oa_flavor;
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if (flavorp)
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*flavorp = flavor;
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/*
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* If there are credentials acquired via a TLS
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* certificate for this TCP connection, use those
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* instead of what is in the RPC header.
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*/
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if ((xprt->xp_tls & (RPCTLS_FLAGS_CERTUSER |
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RPCTLS_FLAGS_DISABLED)) == RPCTLS_FLAGS_CERTUSER &&
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flavor == AUTH_UNIX) {
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cr = crget();
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cr->cr_uid = cr->cr_ruid = cr->cr_svuid = xprt->xp_uid;
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crsetgroups(cr, xprt->xp_ngrps, xprt->xp_gidp);
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cr->cr_rgid = cr->cr_svgid = xprt->xp_gidp[0];
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cr->cr_prison = curthread->td_ucred->cr_prison;
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prison_hold(cr->cr_prison);
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*crp = cr;
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return (TRUE);
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}
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switch (flavor) {
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case AUTH_UNIX:
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xcr = (struct xucred *) rqst->rq_clntcred;
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cr = crget();
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cr->cr_uid = cr->cr_ruid = cr->cr_svuid = xcr->cr_uid;
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crsetgroups(cr, xcr->cr_ngroups, xcr->cr_groups);
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cr->cr_rgid = cr->cr_svgid = cr->cr_groups[0];
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cr->cr_prison = curthread->td_ucred->cr_prison;
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prison_hold(cr->cr_prison);
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*crp = cr;
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return (TRUE);
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case RPCSEC_GSS:
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if (!_svcauth_rpcsec_gss_getcred)
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return (FALSE);
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return (_svcauth_rpcsec_gss_getcred(rqst, crp, flavorp));
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default:
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return (FALSE);
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}
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}
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