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  * 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 #if defined(LIBC_SCCS) && !defined(lint)
   33 static char *sccsid2 = "@(#)authunix_prot.c 1.15 87/08/11 Copyr 1984 Sun Micro";
   34 static char *sccsid = "@(#)authunix_prot.c      2.1 88/07/29 4.0 RPCSRC";
   35 #endif
   36 #include <sys/cdefs.h>
   37 __FBSDID("$FreeBSD$");
   38 
   39 /*
   40  * authunix_prot.c
   41  * XDR for UNIX style authentication parameters for RPC
   42  *
   43  * Copyright (C) 1984, Sun Microsystems, Inc.
   44  */
   45 
   46 #include <sys/param.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 
   70         if (xdrs->x_op == XDR_ENCODE) {
   71                 /*
   72                  * Restrict name length to 255 according to RFC 1057.
   73                  */
   74                 namelen = strlen(hostname);
   75                 if (namelen > 255)
   76                         namelen = 255;
   77         } else {
   78                 namelen = 0;
   79         }
   80         junk = 0;
   81 
   82         if (!xdr_uint32_t(xdrs, time)
   83             || !xdr_uint32_t(xdrs, &namelen))
   84                 return (FALSE);
   85 
   86         /*
   87          * Ignore the hostname on decode.
   88          */
   89         if (xdrs->x_op == XDR_ENCODE) {
   90                 if (!xdr_opaque(xdrs, hostname, namelen))
   91                         return (FALSE);
   92         } else {
   93                 xdr_setpos(xdrs, xdr_getpos(xdrs) + RNDUP(namelen));
   94         }
   95 
   96         if (!xdr_uint32_t(xdrs, &cred->cr_uid))
   97                 return (FALSE);
   98         if (!xdr_uint32_t(xdrs, &cred->cr_groups[0]))
   99                 return (FALSE);
  100 
  101         if (xdrs->x_op == XDR_ENCODE) {
  102                 ngroups = cred->cr_ngroups - 1;
  103                 if (ngroups > NGRPS)
  104                         ngroups = NGRPS;
  105         }
  106 
  107         if (!xdr_uint32_t(xdrs, &ngroups))
  108                 return (FALSE);
  109         for (i = 0; i < ngroups; i++) {
  110                 if (i + 1 < NGROUPS) {
  111                         if (!xdr_uint32_t(xdrs, &cred->cr_groups[i + 1]))
  112                                 return (FALSE);
  113                 } else {
  114                         if (!xdr_uint32_t(xdrs, &junk))
  115                                 return (FALSE);
  116                 }
  117         }
  118 
  119         if (xdrs->x_op == XDR_DECODE) {
  120                 if (ngroups + 1 > NGROUPS)
  121                         cred->cr_ngroups = NGROUPS;
  122                 else
  123                         cred->cr_ngroups = ngroups + 1;
  124         }
  125 
  126         return (TRUE);
  127 }

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