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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.
- */
- #if defined(LIBC_SCCS) && !defined(lint)
- #ident "@(#)svc_auth.c 1.16 94/04/24 SMI"
- static char sccsid[] = "@(#)svc_auth.c 1.26 89/02/07 Copyr 1984 Sun Micro";
- #endif
- #include <sys/cdefs.h>
- __FBSDID("$FreeBSD$");
- /*
- * svc_auth.c, Server-side rpc authenticator interface.
- *
- */
- #include <sys/param.h>
- #include <sys/lock.h>
- #include <sys/mutex.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 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-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
- _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 struct svc_auth_ops svc_auth_null_ops = {
- svcauth_null_wrap,
- svcauth_null_unwrap,
- 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) {
- 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 = xprt->xp_gidp[0];
- cr->cr_prison = &prison0;
- prison_hold(cr->cr_prison);
- *crp = cr;
- return (TRUE);
- }
- switch (flavor) {
- case AUTH_UNIX:
- xcr = (struct xucred *) rqst->rq_clntcred;
- 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_groups[0];
- cr->cr_prison = &prison0;
- 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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