sys/rpc/authunix_prot.c

   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("$FreeBSD$");
  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 }