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FreeBSD/Linux Kernel Cross Reference
sys/rpc/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  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
    5  * unrestricted use provided that this legend is included on all tape
    6  * media and as a part of the software program in whole or part.  Users
    7  * may copy or modify Sun RPC without charge, but are not authorized
    8  * to license or distribute it to anyone else except as part of a product or
    9  * program developed by the user.
   10  * 
   11  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
   12  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
   13  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
   14  * 
   15  * Sun RPC is provided with no support and without any obligation on the
   16  * part of Sun Microsystems, Inc. to assist in its use, correction,
   17  * modification or enhancement.
   18  * 
   19  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
   20  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
   21  * OR ANY PART THEREOF.
   22  * 
   23  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
   24  * or profits or other special, indirect and consequential damages, even if
   25  * Sun has been advised of the possibility of such damages.
   26  * 
   27  * Sun Microsystems, Inc.
   28  * 2550 Garcia Avenue
   29  * Mountain View, California  94043
   30  */
   31 /*
   32  * Copyright (c) 1986-1991 by Sun Microsystems Inc. 
   33  */
   34 
   35 #if defined(LIBC_SCCS) && !defined(lint)
   36 #ident  "@(#)svc_auth.c 1.16    94/04/24 SMI"
   37 static char sccsid[] = "@(#)svc_auth.c 1.26 89/02/07 Copyr 1984 Sun Micro";
   38 #endif
   39 #include <sys/cdefs.h>
   40 __FBSDID("$FreeBSD: stable/9/sys/rpc/svc_auth.c 194498 2009-06-19 17:10:35Z brooks $");
   41 
   42 /*
   43  * svc_auth.c, Server-side rpc authenticator interface.
   44  *
   45  */
   46 
   47 #include <sys/param.h>
   48 #include <sys/lock.h>
   49 #include <sys/mutex.h>
   50 #include <sys/systm.h>
   51 #include <sys/jail.h>
   52 #include <sys/ucred.h>
   53 
   54 #include <rpc/rpc.h>
   55 
   56 static enum auth_stat (*_svcauth_rpcsec_gss)(struct svc_req *,
   57     struct rpc_msg *) = NULL;
   58 static int (*_svcauth_rpcsec_gss_getcred)(struct svc_req *,
   59     struct ucred **, int *);
   60 
   61 static struct svc_auth_ops svc_auth_null_ops;
   62 
   63 /*
   64  * The call rpc message, msg has been obtained from the wire.  The msg contains
   65  * the raw form of credentials and verifiers.  authenticate returns AUTH_OK
   66  * if the msg is successfully authenticated.  If AUTH_OK then the routine also
   67  * does the following things:
   68  * set rqst->rq_xprt->verf to the appropriate response verifier;
   69  * sets rqst->rq_client_cred to the "cooked" form of the credentials.
   70  *
   71  * NB: rqst->rq_cxprt->verf must be pre-alloctaed;
   72  * its length is set appropriately.
   73  *
   74  * The caller still owns and is responsible for msg->u.cmb.cred and
   75  * msg->u.cmb.verf.  The authentication system retains ownership of
   76  * rqst->rq_client_cred, the cooked credentials.
   77  *
   78  * There is an assumption that any flavour less than AUTH_NULL is
   79  * invalid.
   80  */
   81 enum auth_stat
   82 _authenticate(struct svc_req *rqst, struct rpc_msg *msg)
   83 {
   84         int cred_flavor;
   85         enum auth_stat dummy;
   86 
   87         rqst->rq_cred = msg->rm_call.cb_cred;
   88         rqst->rq_auth.svc_ah_ops = &svc_auth_null_ops;
   89         rqst->rq_auth.svc_ah_private = NULL;
   90         cred_flavor = rqst->rq_cred.oa_flavor;
   91         switch (cred_flavor) {
   92         case AUTH_NULL:
   93                 dummy = _svcauth_null(rqst, msg);
   94                 return (dummy);
   95         case AUTH_SYS:
   96                 dummy = _svcauth_unix(rqst, msg);
   97                 return (dummy);
   98         case AUTH_SHORT:
   99                 dummy = _svcauth_short(rqst, msg);
  100                 return (dummy);
  101         case RPCSEC_GSS:
  102                 if (!_svcauth_rpcsec_gss)
  103                         return (AUTH_REJECTEDCRED);
  104                 dummy = _svcauth_rpcsec_gss(rqst, msg);
  105                 return (dummy);
  106         default:
  107                 break;
  108         }
  109 
  110         return (AUTH_REJECTEDCRED);
  111 }
  112 
  113 /*
  114  * A set of null auth methods used by any authentication protocols
  115  * that don't need to inspect or modify the message body.
  116  */
  117 static bool_t
  118 svcauth_null_wrap(SVCAUTH *auth, struct mbuf **mp)
  119 {
  120 
  121         return (TRUE);
  122 }
  123 
  124 static bool_t
  125 svcauth_null_unwrap(SVCAUTH *auth, struct mbuf **mp)
  126 {
  127 
  128         return (TRUE);
  129 }
  130 
  131 static void
  132 svcauth_null_release(SVCAUTH *auth)
  133 {
  134 
  135 }
  136 
  137 static struct svc_auth_ops svc_auth_null_ops = {
  138         svcauth_null_wrap,
  139         svcauth_null_unwrap,
  140         svcauth_null_release,
  141 };
  142 
  143 /*ARGSUSED*/
  144 enum auth_stat
  145 _svcauth_null(struct svc_req *rqst, struct rpc_msg *msg)
  146 {
  147 
  148         rqst->rq_verf = _null_auth;
  149         return (AUTH_OK);
  150 }
  151 
  152 int
  153 svc_auth_reg(int flavor,
  154     enum auth_stat (*svcauth)(struct svc_req *, struct rpc_msg *),
  155     int (*getcred)(struct svc_req *, struct ucred **, int *))
  156 {
  157 
  158         if (flavor == RPCSEC_GSS) {
  159                 _svcauth_rpcsec_gss = svcauth;
  160                 _svcauth_rpcsec_gss_getcred = getcred;
  161         }
  162         return (TRUE);
  163 }
  164 
  165 int
  166 svc_getcred(struct svc_req *rqst, struct ucred **crp, int *flavorp)
  167 {
  168         struct ucred *cr = NULL;
  169         int flavor;
  170         struct xucred *xcr;
  171 
  172         flavor = rqst->rq_cred.oa_flavor;
  173         if (flavorp)
  174                 *flavorp = flavor;
  175 
  176         switch (flavor) {
  177         case AUTH_UNIX:
  178                 xcr = (struct xucred *) rqst->rq_clntcred;
  179                 cr = crget();
  180                 cr->cr_uid = cr->cr_ruid = cr->cr_svuid = xcr->cr_uid;
  181                 crsetgroups(cr, xcr->cr_ngroups, xcr->cr_groups);
  182                 cr->cr_rgid = cr->cr_svgid = cr->cr_groups[0];
  183                 cr->cr_prison = &prison0;
  184                 prison_hold(cr->cr_prison);
  185                 *crp = cr;
  186                 return (TRUE);
  187 
  188         case RPCSEC_GSS:
  189                 if (!_svcauth_rpcsec_gss_getcred)
  190                         return (FALSE);
  191                 return (_svcauth_rpcsec_gss_getcred(rqst, crp, flavorp));
  192 
  193         default:
  194                 return (FALSE);
  195         }
  196 }
  197 

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