sunrpc/svc_authux.c

   1 /*
   2  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
   3  * unrestricted use provided that this legend is included on all tape
   4  * media and as a part of the software program in whole or part.  Users
   5  * may copy or modify Sun RPC without charge, but are not authorized
   6  * to license or distribute it to anyone else except as part of a product or
   7  * program developed by the user.
   8  *
   9  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  10  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  11  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  12  *
  13  * Sun RPC is provided with no support and without any obligation on the
  14  * part of Sun Microsystems, Inc. to assist in its use, correction,
  15  * modification or enhancement.
  16  *
  17  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  18  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  19  * OR ANY PART THEREOF.
  20  *
  21  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  22  * or profits or other special, indirect and consequential damages, even if
  23  * Sun has been advised of the possibility of such damages.
  24  *
  25  * Sun Microsystems, Inc.
  26  * 2550 Garcia Avenue
  27  * Mountain View, California  94043
  28  */
  29
  30 /*
  31  * svc_auth_unix.c
  32  * Handles UNIX flavor authentication parameters on the service side of rpc.
  33  * There are two svc auth implementations here: AUTH_UNIX and AUTH_SHORT.
  34  * _svcauth_unix does full blown unix style uid,gid+gids auth,
  35  * _svcauth_short uses a shorthand auth to index into a cache of longhand auths.
  36  * Note: the shorthand has been gutted for efficiency.
  37  *
  38  * Copyright (C) 1984, Sun Microsystems, Inc.
  39  */
  40
  41 #include <stdio.h>
  42 #include <string.h>
  43 #include <rpc/rpc.h>
  44 #include <rpc/svc.h>
  45
  46 /*
  47  * Unix longhand authenticator
  48  */
  49 enum auth_stat
  50 _svcauth_unix (struct svc_req *rqst, struct rpc_msg *msg)
  51 {
  52   enum auth_stat stat;
  53   XDR xdrs;
  54   struct authunix_parms *aup;
  55   int32_t *buf;
  56   struct area
  57     {
  58       struct authunix_parms area_aup;
  59       char area_machname[MAX_MACHINE_NAME + 1];
  60       gid_t area_gids[NGRPS];
  61     }
  62    *area;
  63   u_int auth_len;
  64   u_int str_len, gid_len;
  65   u_int i;
  66
  67   area = (struct area *) rqst->rq_clntcred;
  68   aup = &area->area_aup;
  69   aup->aup_machname = area->area_machname;
  70   aup->aup_gids = area->area_gids;
  71   auth_len = (u_int) msg->rm_call.cb_cred.oa_length;
  72   INTUSE(xdrmem_create) (&xdrs, msg->rm_call.cb_cred.oa_base, auth_len,
  73                          XDR_DECODE);
  74   buf = XDR_INLINE (&xdrs, auth_len);
  75   if (buf != NULL)
  76     {
  77       aup->aup_time = IXDR_GET_LONG (buf);
  78       str_len = IXDR_GET_U_INT32 (buf);
  79       if (str_len > MAX_MACHINE_NAME)
  80         {
  81           stat = AUTH_BADCRED;
  82           goto done;
  83         }
  84       memcpy (aup->aup_machname, (caddr_t) buf, (u_int) str_len);
  85       aup->aup_machname[str_len] = 0;
  86       str_len = RNDUP (str_len);
  87       buf = (int32_t *) ((char *) buf + str_len);
  88       aup->aup_uid = IXDR_GET_LONG (buf);
  89       aup->aup_gid = IXDR_GET_LONG (buf);
  90       gid_len = IXDR_GET_U_INT32 (buf);
  91       if (gid_len > NGRPS)
  92         {
  93           stat = AUTH_BADCRED;
  94           goto done;
  95         }
  96       aup->aup_len = gid_len;
  97       for (i = 0; i < gid_len; i++)
  98         {
  99           aup->aup_gids[i] = IXDR_GET_LONG (buf);
 100         }
 101       /*
 102        * five is the smallest unix credentials structure -
 103        * timestamp, hostname len (0), uid, gid, and gids len (0).
 104        */
 105       if ((5 + gid_len) * BYTES_PER_XDR_UNIT + str_len > auth_len)
 106         {
 107           stat = AUTH_BADCRED;
 108           goto done;
 109         }
 110     }
 111   else if (!INTUSE(xdr_authunix_parms) (&xdrs, aup))
 112     {
 113       xdrs.x_op = XDR_FREE;
 114       (void) INTUSE(xdr_authunix_parms) (&xdrs, aup);
 115       stat = AUTH_BADCRED;
 116       goto done;
 117     }
 118
 119   /* get the verifier */
 120   if ((u_int)msg->rm_call.cb_verf.oa_length)
 121     {
 122       rqst->rq_xprt->xp_verf.oa_flavor =
 123         msg->rm_call.cb_verf.oa_flavor;
 124       rqst->rq_xprt->xp_verf.oa_base =
 125         msg->rm_call.cb_verf.oa_base;
 126       rqst->rq_xprt->xp_verf.oa_length =
 127         msg->rm_call.cb_verf.oa_length;
 128     }
 129   else
 130     {
 131       rqst->rq_xprt->xp_verf.oa_flavor = AUTH_NULL;
 132       rqst->rq_xprt->xp_verf.oa_length = 0;
 133     }
 134   stat = AUTH_OK;
 135 done:
 136   XDR_DESTROY (&xdrs);
 137   return stat;
 138 }
 139
 140
 141 /*
 142  * Shorthand unix authenticator
 143  * Looks up longhand in a cache.
 144  */
 145 /*ARGSUSED */
 146 enum auth_stat
 147 _svcauth_short (struct svc_req *rqst, struct rpc_msg *msg)
 148 {
 149   return AUTH_REJECTEDCRED;
 150 }