sunrpc/svc_authux.c

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