The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*      $NetBSD: authunix_prot.c,v 1.12 2000/01/22 22:19:17 mycroft Exp $       */
    2 
    3 /*-
    4  * Copyright (c) 2009, Sun Microsystems, Inc.
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without 
    8  * modification, are permitted provided that the following conditions are met:
    9  * - Redistributions of source code must retain the above copyright notice, 
   10  *   this list of conditions and the following disclaimer.
   11  * - Redistributions in binary form must reproduce the above copyright notice, 
   12  *   this list of conditions and the following disclaimer in the documentation 
   13  *   and/or other materials provided with the distribution.
   14  * - Neither the name of Sun Microsystems, Inc. nor the names of its 
   15  *   contributors may be used to endorse or promote products derived 
   16  *   from this software without specific prior written permission.
   17  * 
   18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
   19  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
   20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
   21  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 
   22  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
   23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
   24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
   25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
   26  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
   27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
   28  * POSSIBILITY OF SUCH DAMAGE.
   29  */
   30 
   31 #if defined(LIBC_SCCS) && !defined(lint)
   32 static char *sccsid2 = "@(#)authunix_prot.c 1.15 87/08/11 Copyr 1984 Sun Micro";
   33 static char *sccsid = "@(#)authunix_prot.c      2.1 88/07/29 4.0 RPCSRC";
   34 #endif
   35 #include <sys/cdefs.h>
   36 __FBSDID("$FreeBSD: releng/11.2/sys/rpc/authunix_prot.c 331722 2018-03-29 02:50:57Z eadler $");
   37 
   38 /*
   39  * authunix_prot.c
   40  * XDR for UNIX style authentication parameters for RPC
   41  *
   42  * Copyright (C) 1984, Sun Microsystems, Inc.
   43  */
   44 
   45 #include <sys/param.h>
   46 #include <sys/jail.h>
   47 #include <sys/kernel.h>
   48 #include <sys/systm.h>
   49 #include <sys/ucred.h>
   50 
   51 #include <rpc/types.h>
   52 #include <rpc/xdr.h>
   53 #include <rpc/auth.h>
   54 
   55 #include <rpc/rpc_com.h>
   56 
   57 /* gids compose part of a credential; there may not be more than 16 of them */
   58 #define NGRPS 16
   59 
   60 /*
   61  * XDR for unix authentication parameters.
   62  */
   63 bool_t
   64 xdr_authunix_parms(XDR *xdrs, uint32_t *time, struct xucred *cred)
   65 {
   66         uint32_t namelen;
   67         uint32_t ngroups, i;
   68         uint32_t junk;
   69         char hostbuf[MAXHOSTNAMELEN];
   70 
   71         if (xdrs->x_op == XDR_ENCODE) {
   72                 /*
   73                  * Restrict name length to 255 according to RFC 1057.
   74                  */
   75                 getcredhostname(NULL, hostbuf, sizeof(hostbuf));
   76                 namelen = strlen(hostbuf);
   77                 if (namelen > 255)
   78                         namelen = 255;
   79         } else {
   80                 namelen = 0;
   81         }
   82         junk = 0;
   83 
   84         if (!xdr_uint32_t(xdrs, time)
   85             || !xdr_uint32_t(xdrs, &namelen))
   86                 return (FALSE);
   87 
   88         /*
   89          * Ignore the hostname on decode.
   90          */
   91         if (xdrs->x_op == XDR_ENCODE) {
   92                 if (!xdr_opaque(xdrs, hostbuf, namelen))
   93                         return (FALSE);
   94         } else {
   95                 xdr_setpos(xdrs, xdr_getpos(xdrs) + RNDUP(namelen));
   96         }
   97 
   98         if (!xdr_uint32_t(xdrs, &cred->cr_uid))
   99                 return (FALSE);
  100         if (!xdr_uint32_t(xdrs, &cred->cr_groups[0]))
  101                 return (FALSE);
  102 
  103         if (xdrs->x_op == XDR_ENCODE) {
  104                 ngroups = cred->cr_ngroups - 1;
  105                 if (ngroups > NGRPS)
  106                         ngroups = NGRPS;
  107         }
  108 
  109         if (!xdr_uint32_t(xdrs, &ngroups))
  110                 return (FALSE);
  111         for (i = 0; i < ngroups; i++) {
  112                 if (i + 1 < ngroups_max + 1) {
  113                         if (!xdr_uint32_t(xdrs, &cred->cr_groups[i + 1]))
  114                                 return (FALSE);
  115                 } else {
  116                         if (!xdr_uint32_t(xdrs, &junk))
  117                                 return (FALSE);
  118                 }
  119         }
  120 
  121         if (xdrs->x_op == XDR_DECODE) {
  122                 if (ngroups + 1 > ngroups_max + 1)
  123                         cred->cr_ngroups = ngroups_max + 1;
  124                 else
  125                         cred->cr_ngroups = ngroups + 1;
  126         }
  127 
  128         return (TRUE);
  129 }

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