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/* $NetBSD: svc_auth.c,v 1.12 2000/07/06 03:10:35 christos Exp $ */
/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 2009, Sun Microsystems, Inc.
* All rights reserved.
*
* 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 Sun Microsystems, 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.
*/
/*
* svc_auth.c, Server-side rpc authenticator interface.
*
*/
#include <sys/param.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/proc.h>
#include <sys/systm.h>
#include <sys/jail.h>
#include <sys/ucred.h>
#include <rpc/rpc.h>
#include <rpc/rpcsec_tls.h>
static enum auth_stat (*_svcauth_rpcsec_gss)(struct svc_req *,
struct rpc_msg *) = NULL;
static int (*_svcauth_rpcsec_gss_getcred)(struct svc_req *,
struct ucred **, int *);
static const struct svc_auth_ops svc_auth_null_ops;
/*
* 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;
enum auth_stat dummy;
rqst->rq_cred = msg->rm_call.cb_cred;
rqst->rq_auth.svc_ah_ops = &svc_auth_null_ops;
rqst->rq_auth.svc_ah_private = NULL;
cred_flavor = rqst->rq_cred.oa_flavor;
switch (cred_flavor) {
case AUTH_NULL:
dummy = _svcauth_null(rqst, msg);
return (dummy);
case AUTH_SYS:
if ((rqst->rq_xprt->xp_tls & RPCTLS_FLAGS_DISABLED) != 0)
return (AUTH_REJECTEDCRED);
dummy = _svcauth_unix(rqst, msg);
return (dummy);
case AUTH_SHORT:
if ((rqst->rq_xprt->xp_tls & RPCTLS_FLAGS_DISABLED) != 0)
return (AUTH_REJECTEDCRED);
dummy = _svcauth_short(rqst, msg);
return (dummy);
case RPCSEC_GSS:
if ((rqst->rq_xprt->xp_tls & RPCTLS_FLAGS_DISABLED) != 0)
return (AUTH_REJECTEDCRED);
if (!_svcauth_rpcsec_gss)
return (AUTH_REJECTEDCRED);
dummy = _svcauth_rpcsec_gss(rqst, msg);
return (dummy);
case AUTH_TLS:
dummy = _svcauth_rpcsec_tls(rqst, msg);
return (dummy);
default:
break;
}
return (AUTH_REJECTEDCRED);
}
/*
* A set of null auth methods used by any authentication protocols
* that don't need to inspect or modify the message body.
*/
static bool_t
svcauth_null_wrap(SVCAUTH *auth, struct mbuf **mp)
{
return (TRUE);
}
static bool_t
svcauth_null_unwrap(SVCAUTH *auth, struct mbuf **mp)
{
return (TRUE);
}
static void
svcauth_null_release(SVCAUTH *auth)
{
}
static const struct svc_auth_ops svc_auth_null_ops = {
.svc_ah_wrap = svcauth_null_wrap,
.svc_ah_unwrap = svcauth_null_unwrap,
.svc_ah_release = svcauth_null_release,
};
/*ARGSUSED*/
enum auth_stat
_svcauth_null(struct svc_req *rqst, struct rpc_msg *msg)
{
rqst->rq_verf = _null_auth;
return (AUTH_OK);
}
int
svc_auth_reg(int flavor,
enum auth_stat (*svcauth)(struct svc_req *, struct rpc_msg *),
int (*getcred)(struct svc_req *, struct ucred **, int *))
{
if (flavor == RPCSEC_GSS) {
_svcauth_rpcsec_gss = svcauth;
_svcauth_rpcsec_gss_getcred = getcred;
}
return (TRUE);
}
int
svc_getcred(struct svc_req *rqst, struct ucred **crp, int *flavorp)
{
struct ucred *cr = NULL;
int flavor;
struct xucred *xcr;
SVCXPRT *xprt = rqst->rq_xprt;
flavor = rqst->rq_cred.oa_flavor;
if (flavorp)
*flavorp = flavor;
/*
* If there are credentials acquired via a TLS
* certificate for this TCP connection, use those
* instead of what is in the RPC header.
*/
if ((xprt->xp_tls & (RPCTLS_FLAGS_CERTUSER |
RPCTLS_FLAGS_DISABLED)) == RPCTLS_FLAGS_CERTUSER &&
flavor == AUTH_UNIX) {
if (xprt->xp_ngrps <= 0)
return (FALSE);
cr = crget();
cr->cr_uid = cr->cr_ruid = cr->cr_svuid = xprt->xp_uid;
crsetgroups(cr, xprt->xp_ngrps, xprt->xp_gidp);
cr->cr_rgid = cr->cr_svgid = cr->cr_gid;
cr->cr_prison = curthread->td_ucred->cr_prison;
prison_hold(cr->cr_prison);
*crp = cr;
return (TRUE);
}
switch (flavor) {
case AUTH_UNIX:
xcr = (struct xucred *) rqst->rq_clntcred;
if (xcr->cr_ngroups <= 0)
return (FALSE);
cr = crget();
cr->cr_uid = cr->cr_ruid = cr->cr_svuid = xcr->cr_uid;
crsetgroups(cr, xcr->cr_ngroups, xcr->cr_groups);
cr->cr_rgid = cr->cr_svgid = cr->cr_gid;
cr->cr_prison = curthread->td_ucred->cr_prison;
prison_hold(cr->cr_prison);
*crp = cr;
return (TRUE);
case RPCSEC_GSS:
if (!_svcauth_rpcsec_gss_getcred)
return (FALSE);
return (_svcauth_rpcsec_gss_getcred(rqst, crp, flavorp));
default:
return (FALSE);
}
}
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