rpc.subproj/svc_auth_unix.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
   7  * Reserved.  This file contains Original Code and/or Modifications of
   8  * Original Code as defined in and that are subject to the Apple Public
   9  * Source License Version 1.1 (the "License").  You may not use this file
  10  * except in compliance with the License.  Please obtain a copy of the
  11  * License at http://www.apple.com/publicsource and read it before using
  12  * this file.
  13  *
  14  * The Original Code and all software distributed under the License are
  15  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  16  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  17  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE OR NON- INFRINGEMENT.  Please see the
  19  * License for the specific language governing rights and limitations
  20  * under the License.
  21  *
  22  * @APPLE_LICENSE_HEADER_END@
  23  */
  24 /*
  25  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
  26  * unrestricted use provided that this legend is included on all tape
  27  * media and as a part of the software program in whole or part.  Users
  28  * may copy or modify Sun RPC without charge, but are not authorized
  29  * to license or distribute it to anyone else except as part of a product or
  30  * program developed by the user.
  31  *
  32  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  33  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  34  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  35  *
  36  * Sun RPC is provided with no support and without any obligation on the
  37  * part of Sun Microsystems, Inc. to assist in its use, correction,
  38  * modification or enhancement.
  39  *
  40  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  41  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  42  * OR ANY PART THEREOF.
  43  *
  44  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  45  * or profits or other special, indirect and consequential damages, even if
  46  * Sun has been advised of the possibility of such damages.
  47  *
  48  * Sun Microsystems, Inc.
  49  * 2550 Garcia Avenue
  50  * Mountain View, California  94043
  51  */
  52
  53 #if defined(LIBC_SCCS) && !defined(lint)
  54 /*static char *sccsid = "from: @(#)svc_auth_unix.c 1.28 88/02/08 Copyr 1984 Sun Micro";*/
  55 /*static char *sccsid = "from: @(#)svc_auth_unix.c      2.3 88/08/01 4.0 RPCSRC";*/
  56 static char *rcsid = "$Id: svc_auth_unix.c,v 1.4 2002/02/19 20:36:25 epeyton Exp $";
  57 #endif
  58
  59 /*
  60  * svc_auth_unix.c
  61  * Handles UNIX flavor authentication parameters on the service side of rpc.
  62  * There are two svc auth implementations here: AUTH_UNIX and AUTH_SHORT.
  63  * _svcauth_unix does full blown unix style uid,gid+gids auth,
  64  * _svcauth_short uses a shorthand auth to index into a cache of longhand auths.
  65  * Note: the shorthand has been gutted for efficiency.
  66  *
  67  * Copyright (C) 1984, Sun Microsystems, Inc.
  68  */
  69
  70 #include <stdio.h>
  71 #include <string.h>
  72 #include <sys/param.h>
  73 #include <rpc/rpc.h>
  74
  75 /*
  76  * Unix longhand authenticator
  77  */
  78 enum auth_stat
  79 _svcauth_unix(rqst, msg)
  80         register struct svc_req *rqst;
  81         register struct rpc_msg *msg;
  82 {
  83         register enum auth_stat stat;
  84         XDR xdrs;
  85         register struct authunix_parms *aup;
  86         register long *buf;
  87         struct area {
  88                 struct authunix_parms area_aup;
  89                 char area_machname[MAX_MACHINE_NAME+1];
  90                 int area_gids[NGROUPS];
  91         } *area;
  92         u_int auth_len;
  93         int str_len, gid_len;
  94         register int i;
  95
  96         area = (struct area *) rqst->rq_clntcred;
  97         aup = &area->area_aup;
  98         aup->aup_machname = area->area_machname;
  99         aup->aup_gids = area->area_gids;
 100         auth_len = (u_int)msg->rm_call.cb_cred.oa_length;
 101         xdrmem_create(&xdrs, msg->rm_call.cb_cred.oa_base, auth_len,XDR_DECODE);
 102         buf = XDR_INLINE(&xdrs, auth_len);
 103         if (buf != NULL) {
 104                 aup->aup_time = IXDR_GET_LONG(buf);
 105                 str_len = IXDR_GET_U_LONG(buf);
 106                 if (str_len > MAX_MACHINE_NAME) {
 107                         stat = AUTH_BADCRED;
 108                         goto done;
 109                 }
 110                 bcopy((caddr_t)buf, aup->aup_machname, (u_int)str_len);
 111                 aup->aup_machname[str_len] = 0;
 112                 str_len = RNDUP(str_len);
 113                 buf += str_len / sizeof (long);
 114                 aup->aup_uid = IXDR_GET_LONG(buf);
 115                 aup->aup_gid = IXDR_GET_LONG(buf);
 116                 gid_len = IXDR_GET_U_LONG(buf);
 117                 if (gid_len > NGROUPS) {
 118                         stat = AUTH_BADCRED;
 119                         goto done;
 120                 }
 121                 aup->aup_len = gid_len;
 122                 for (i = 0; i < gid_len; i++) {
 123                         aup->aup_gids[i] = IXDR_GET_LONG(buf);
 124                 }
 125                 /*
 126                  * five is the smallest unix credentials structure -
 127                  * timestamp, hostname len (0), uid, gid, and gids len (0).
 128                  */
 129                 if ((5 + gid_len) * BYTES_PER_XDR_UNIT + str_len > auth_len) {
 130                         (void) printf("bad auth_len gid %d str %d auth %d\n",
 131                             gid_len, str_len, auth_len);
 132                         stat = AUTH_BADCRED;
 133                         goto done;
 134                 }
 135         } else if (! xdr_authunix_parms(&xdrs, aup)) {
 136                 xdrs.x_op = XDR_FREE;
 137                 (void)xdr_authunix_parms(&xdrs, aup);
 138                 stat = AUTH_BADCRED;
 139                 goto done;
 140         }
 141         rqst->rq_xprt->xp_verf.oa_flavor = AUTH_NULL;
 142         rqst->rq_xprt->xp_verf.oa_length = 0;
 143         stat = AUTH_OK;
 144 done:
 145         XDR_DESTROY(&xdrs);
 146         return (stat);
 147 }
 148
 149
 150 /*
 151  * Shorthand unix authenticator
 152  * Looks up longhand in a cache.
 153  */
 154 /*ARGSUSED*/
 155 enum auth_stat
 156 _svcauth_short(rqst, msg)
 157         struct svc_req *rqst;
 158         struct rpc_msg *msg;
 159 {
 160         return (AUTH_REJECTEDCRED);
 161 }