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

     /*      $NetBSD: authunix_prot.c,v 1.12 2000/01/22 22:19:17 mycroft 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.
     */
    
    #if defined(LIBC_SCCS) && !defined(lint)
    static char *sccsid2 = "@(#)authunix_prot.c 1.15 87/08/11 Copyr 1984 Sun Micro";
    static char *sccsid = "@(#)authunix_prot.c      2.1 88/07/29 4.0 RPCSRC";
    #endif
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/12.0/sys/rpc/authunix_prot.c 326023 2017-11-20 19:43:44Z pfg $");
    
    /*
     * authunix_prot.c
     * XDR for UNIX style authentication parameters for RPC
     *
     * Copyright (C) 1984, Sun Microsystems, Inc.
     */
    
    #include <sys/param.h>
    #include <sys/jail.h>
    #include <sys/kernel.h>
    #include <sys/systm.h>
    #include <sys/ucred.h>
    
    #include <rpc/types.h>
    #include <rpc/xdr.h>
    #include <rpc/auth.h>
    
    #include <rpc/rpc_com.h>
    
    /* gids compose part of a credential; there may not be more than 16 of them */
    #define NGRPS 16
    
    /*
     * XDR for unix authentication parameters.
     */
    bool_t
    xdr_authunix_parms(XDR *xdrs, uint32_t *time, struct xucred *cred)
    {
            uint32_t namelen;
            uint32_t ngroups, i;
            uint32_t junk;
            char hostbuf[MAXHOSTNAMELEN];
    
            if (xdrs->x_op == XDR_ENCODE) {
                    /*
                     * Restrict name length to 255 according to RFC 1057.
                     */
                    getcredhostname(NULL, hostbuf, sizeof(hostbuf));
                    namelen = strlen(hostbuf);
                    if (namelen > 255)
                            namelen = 255;
            } else {
                    namelen = 0;
            }
            junk = 0;
    
            if (!xdr_uint32_t(xdrs, time)
                || !xdr_uint32_t(xdrs, &namelen))
                    return (FALSE);
    
            /*
             * Ignore the hostname on decode.
             */
            if (xdrs->x_op == XDR_ENCODE) {
                    if (!xdr_opaque(xdrs, hostbuf, namelen))
                            return (FALSE);
            } else {
                    xdr_setpos(xdrs, xdr_getpos(xdrs) + RNDUP(namelen));
            }
    
           if (!xdr_uint32_t(xdrs, &cred->cr_uid))
                   return (FALSE);
           if (!xdr_uint32_t(xdrs, &cred->cr_groups[0]))
                   return (FALSE);
   
           if (xdrs->x_op == XDR_ENCODE) {
                   ngroups = cred->cr_ngroups - 1;
                   if (ngroups > NGRPS)
                           ngroups = NGRPS;
           }
   
           if (!xdr_uint32_t(xdrs, &ngroups))
                   return (FALSE);
           for (i = 0; i < ngroups; i++) {
                   if (i + 1 < ngroups_max + 1) {
                           if (!xdr_uint32_t(xdrs, &cred->cr_groups[i + 1]))
                                   return (FALSE);
                   } else {
                           if (!xdr_uint32_t(xdrs, &junk))
                                   return (FALSE);
                   }
           }
   
           if (xdrs->x_op == XDR_DECODE) {
                   if (ngroups + 1 > ngroups_max + 1)
                           cred->cr_ngroups = ngroups_max + 1;
                   else
                           cred->cr_ngroups = ngroups + 1;
           }
   
           return (TRUE);
   }

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