svc_auth.c

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    1 /*      $NetBSD: svc_auth.c,v 1.12 2000/07/06 03:10:35 christos Exp $   */
    2 
    3 /*-
    4  * SPDX-License-Identifier: BSD-3-Clause
    5  *
    6  * Copyright (c) 2009, Sun Microsystems, Inc.
    7  * All rights reserved.
    8  *
    9  * Redistribution and use in source and binary forms, with or without 
   10  * modification, are permitted provided that the following conditions are met:
   11  * - Redistributions of source code must retain the above copyright notice, 
   12  *   this list of conditions and the following disclaimer.
   13  * - Redistributions in binary form must reproduce the above copyright notice, 
   14  *   this list of conditions and the following disclaimer in the documentation 
   15  *   and/or other materials provided with the distribution.
   16  * - Neither the name of Sun Microsystems, Inc. nor the names of its 
   17  *   contributors may be used to endorse or promote products derived 
   18  *   from this software without specific prior written permission.
   19  * 
   20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
   21  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
   23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 
   24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
   25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
   26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
   27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
   28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
   29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
   30  * POSSIBILITY OF SUCH DAMAGE.
   31  */
   32 /*
   33  * Copyright (c) 1986-1991 by Sun Microsystems Inc. 
   34  */
   35 
   36 #if defined(LIBC_SCCS) && !defined(lint)
   37 #ident  "@(#)svc_auth.c 1.16    94/04/24 SMI"
   38 static char sccsid[] = "@(#)svc_auth.c 1.26 89/02/07 Copyr 1984 Sun Micro";
   39 #endif
   40 #include <sys/cdefs.h>
   41 __FBSDID("$FreeBSD$");
   42 
   43 /*
   44  * svc_auth.c, Server-side rpc authenticator interface.
   45  *
   46  */
   47 
   48 #include <sys/param.h>
   49 #include <sys/lock.h>
   50 #include <sys/mutex.h>
   51 #include <sys/proc.h>
   52 #include <sys/systm.h>
   53 #include <sys/jail.h>
   54 #include <sys/ucred.h>
   55 
   56 #include <rpc/rpc.h>
   57 #include <rpc/rpcsec_tls.h>
   58 
   59 static enum auth_stat (*_svcauth_rpcsec_gss)(struct svc_req *,
   60     struct rpc_msg *) = NULL;
   61 static int (*_svcauth_rpcsec_gss_getcred)(struct svc_req *,
   62     struct ucred **, int *);
   63 
   64 static const struct svc_auth_ops svc_auth_null_ops;
   65 
   66 /*
   67  * The call rpc message, msg has been obtained from the wire.  The msg contains
   68  * the raw form of credentials and verifiers.  authenticate returns AUTH_OK
   69  * if the msg is successfully authenticated.  If AUTH_OK then the routine also
   70  * does the following things:
   71  * set rqst->rq_xprt->verf to the appropriate response verifier;
   72  * sets rqst->rq_client_cred to the "cooked" form of the credentials.
   73  *
   74  * NB: rqst->rq_cxprt->verf must be pre-allocated;
   75  * its length is set appropriately.
   76  *
   77  * The caller still owns and is responsible for msg->u.cmb.cred and
   78  * msg->u.cmb.verf.  The authentication system retains ownership of
   79  * rqst->rq_client_cred, the cooked credentials.
   80  *
   81  * There is an assumption that any flavour less than AUTH_NULL is
   82  * invalid.
   83  */
   84 enum auth_stat
   85 _authenticate(struct svc_req *rqst, struct rpc_msg *msg)
   86 {
   87         int cred_flavor;
   88         enum auth_stat dummy;
   89 
   90         rqst->rq_cred = msg->rm_call.cb_cred;
   91         rqst->rq_auth.svc_ah_ops = &svc_auth_null_ops;
   92         rqst->rq_auth.svc_ah_private = NULL;
   93         cred_flavor = rqst->rq_cred.oa_flavor;
   94         switch (cred_flavor) {
   95         case AUTH_NULL:
   96                 dummy = _svcauth_null(rqst, msg);
   97                 return (dummy);
   98         case AUTH_SYS:
   99                 if ((rqst->rq_xprt->xp_tls & RPCTLS_FLAGS_DISABLED) != 0)
  100                         return (AUTH_REJECTEDCRED);
  101                 dummy = _svcauth_unix(rqst, msg);
  102                 return (dummy);
  103         case AUTH_SHORT:
  104                 if ((rqst->rq_xprt->xp_tls & RPCTLS_FLAGS_DISABLED) != 0)
  105                         return (AUTH_REJECTEDCRED);
  106                 dummy = _svcauth_short(rqst, msg);
  107                 return (dummy);
  108         case RPCSEC_GSS:
  109                 if ((rqst->rq_xprt->xp_tls & RPCTLS_FLAGS_DISABLED) != 0)
  110                         return (AUTH_REJECTEDCRED);
  111                 if (!_svcauth_rpcsec_gss)
  112                         return (AUTH_REJECTEDCRED);
  113                 dummy = _svcauth_rpcsec_gss(rqst, msg);
  114                 return (dummy);
  115         case AUTH_TLS:
  116                 dummy = _svcauth_rpcsec_tls(rqst, msg);
  117                 return (dummy);
  118         default:
  119                 break;
  120         }
  121 
  122         return (AUTH_REJECTEDCRED);
  123 }
  124 
  125 /*
  126  * A set of null auth methods used by any authentication protocols
  127  * that don't need to inspect or modify the message body.
  128  */
  129 static bool_t
  130 svcauth_null_wrap(SVCAUTH *auth, struct mbuf **mp)
  131 {
  132 
  133         return (TRUE);
  134 }
  135 
  136 static bool_t
  137 svcauth_null_unwrap(SVCAUTH *auth, struct mbuf **mp)
  138 {
  139 
  140         return (TRUE);
  141 }
  142 
  143 static void
  144 svcauth_null_release(SVCAUTH *auth)
  145 {
  146 
  147 }
  148 
  149 static const struct svc_auth_ops svc_auth_null_ops = {
  150         .svc_ah_wrap = svcauth_null_wrap,
  151         .svc_ah_unwrap = svcauth_null_unwrap,
  152         .svc_ah_release = svcauth_null_release,
  153 };
  154 
  155 /*ARGSUSED*/
  156 enum auth_stat
  157 _svcauth_null(struct svc_req *rqst, struct rpc_msg *msg)
  158 {
  159 
  160         rqst->rq_verf = _null_auth;
  161         return (AUTH_OK);
  162 }
  163 
  164 int
  165 svc_auth_reg(int flavor,
  166     enum auth_stat (*svcauth)(struct svc_req *, struct rpc_msg *),
  167     int (*getcred)(struct svc_req *, struct ucred **, int *))
  168 {
  169 
  170         if (flavor == RPCSEC_GSS) {
  171                 _svcauth_rpcsec_gss = svcauth;
  172                 _svcauth_rpcsec_gss_getcred = getcred;
  173         }
  174         return (TRUE);
  175 }
  176 
  177 int
  178 svc_getcred(struct svc_req *rqst, struct ucred **crp, int *flavorp)
  179 {
  180         struct ucred *cr = NULL;
  181         int flavor;
  182         struct xucred *xcr;
  183         SVCXPRT *xprt = rqst->rq_xprt;
  184 
  185         flavor = rqst->rq_cred.oa_flavor;
  186         if (flavorp)
  187                 *flavorp = flavor;
  188 
  189         /*
  190          * If there are credentials acquired via a TLS
  191          * certificate for this TCP connection, use those
  192          * instead of what is in the RPC header.
  193          */
  194         if ((xprt->xp_tls & (RPCTLS_FLAGS_CERTUSER |
  195             RPCTLS_FLAGS_DISABLED)) == RPCTLS_FLAGS_CERTUSER &&
  196             flavor == AUTH_UNIX) {
  197                 cr = crget();
  198                 cr->cr_uid = cr->cr_ruid = cr->cr_svuid = xprt->xp_uid;
  199                 crsetgroups(cr, xprt->xp_ngrps, xprt->xp_gidp);
  200                 cr->cr_rgid = cr->cr_svgid = xprt->xp_gidp[0];
  201 #ifdef VNET_NFSD
  202                 if (jailed(curthread->td_ucred))
  203                         cr->cr_prison = curthread->td_ucred->cr_prison;
  204                 else
  205 #endif
  206                         cr->cr_prison = &prison0;
  207                 prison_hold(cr->cr_prison);
  208                 *crp = cr;
  209                 return (TRUE);
  210         }
  211 
  212         switch (flavor) {
  213         case AUTH_UNIX:
  214                 xcr = (struct xucred *) rqst->rq_clntcred;
  215                 cr = crget();
  216                 cr->cr_uid = cr->cr_ruid = cr->cr_svuid = xcr->cr_uid;
  217                 crsetgroups(cr, xcr->cr_ngroups, xcr->cr_groups);
  218                 cr->cr_rgid = cr->cr_svgid = cr->cr_groups[0];
  219 #ifdef VNET_NFSD
  220                 if (jailed(curthread->td_ucred))
  221                         cr->cr_prison = curthread->td_ucred->cr_prison;
  222                 else
  223 #endif
  224                         cr->cr_prison = &prison0;
  225                 prison_hold(cr->cr_prison);
  226                 *crp = cr;
  227                 return (TRUE);
  228 
  229         case RPCSEC_GSS:
  230                 if (!_svcauth_rpcsec_gss_getcred)
  231                         return (FALSE);
  232                 return (_svcauth_rpcsec_gss_getcred(rqst, crp, flavorp));
  233 
  234         default:
  235                 return (FALSE);
  236         }
  237 }
  238

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FreeBSD/Linux Kernel Cross Reference sys/rpc/svc_auth.c

FreeBSD/Linux Kernel Cross Reference
sys/rpc/svc_auth.c