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

     /*      $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 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-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 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) {
                   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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