lib/libc/rpc/svc_auth_unix.c

   1 /*      $NetBSD: svc_auth_unix.c,v 1.18 2003/01/18 11:29:06 thorpej 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 #include <sys/cdefs.h>
  33 #if defined(LIBC_SCCS) && !defined(lint)
  34 #if 0
  35 static char *sccsid = "@(#)svc_auth_unix.c 1.28 88/02/08 Copyr 1984 Sun Micro";
  36 static char *sccsid = "@(#)svc_auth_unix.c      2.3 88/08/01 4.0 RPCSRC";
  37 #else
  38 __RCSID("$NetBSD: svc_auth_unix.c,v 1.18 2003/01/18 11:29:06 thorpej Exp $");
  39 #endif
  40 #endif
  41
  42 /*
  43  * svc_auth_unix.c
  44  * Handles UNIX flavor authentication parameters on the service side of rpc.
  45  * There are two svc auth implementations here: AUTH_UNIX and AUTH_SHORT.
  46  * _svcauth_unix does full blown unix style uid,gid+gids auth,
  47  * _svcauth_short uses a shorthand auth to index into a cache of longhand auths.
  48  * Note: the shorthand has been gutted for efficiency.
  49  *
  50  * Copyright (C) 1984, Sun Microsystems, Inc.
  51  */
  52
  53 #include "namespace.h"
  54
  55 #include <assert.h>
  56 #include <stdio.h>
  57 #include <string.h>
  58
  59 #include <rpc/rpc.h>
  60
  61 /*
  62  * Unix longhand authenticator
  63  */
  64 enum auth_stat
  65 _svcauth_unix(rqst, msg)
  66         struct svc_req *rqst;
  67         struct rpc_msg *msg;
  68 {
  69         enum auth_stat stat;
  70         XDR xdrs;
  71         struct authunix_parms *aup;
  72         int32_t *buf;
  73         struct area {
  74                 struct authunix_parms area_aup;
  75                 char area_machname[MAX_MACHINE_NAME+1];
  76                 int area_gids[NGRPS];
  77         } *area;
  78         u_int auth_len;
  79         size_t str_len, gid_len, i;
  80
  81         _DIAGASSERT(rqst != NULL);
  82         _DIAGASSERT(msg != NULL);
  83
  84         area = (struct area *) rqst->rq_clntcred;
  85         aup = &area->area_aup;
  86         aup->aup_machname = area->area_machname;
  87         aup->aup_gids = area->area_gids;
  88         auth_len = (u_int)msg->rm_call.cb_cred.oa_length;
  89         xdrmem_create(&xdrs, msg->rm_call.cb_cred.oa_base, auth_len,XDR_DECODE);
  90         buf = XDR_INLINE(&xdrs, auth_len);
  91         if (buf != NULL) {
  92                 aup->aup_time = IXDR_GET_INT32(buf);
  93                 str_len = (size_t)IXDR_GET_U_INT32(buf);
  94                 if (str_len > MAX_MACHINE_NAME) {
  95                         stat = AUTH_BADCRED;
  96                         goto done;
  97                 }
  98                 memmove(aup->aup_machname, buf, str_len);
  99                 aup->aup_machname[str_len] = 0;
 100                 str_len = RNDUP(str_len);
 101                 buf += str_len / sizeof (int32_t);
 102                 aup->aup_uid = (int)IXDR_GET_INT32(buf);
 103                 aup->aup_gid = (int)IXDR_GET_INT32(buf);
 104                 gid_len = (size_t)IXDR_GET_U_INT32(buf);
 105                 if (gid_len > NGRPS) {
 106                         stat = AUTH_BADCRED;
 107                         goto done;
 108                 }
 109                 aup->aup_len = gid_len;
 110                 for (i = 0; i < gid_len; i++) {
 111                         aup->aup_gids[i] = (int)IXDR_GET_INT32(buf);
 112                 }
 113                 /*
 114                  * five is the smallest unix credentials structure -
 115                  * timestamp, hostname len (0), uid, gid, and gids len (0).
 116                  */
 117                 if ((5 + gid_len) * BYTES_PER_XDR_UNIT + str_len > auth_len) {
 118                         (void) printf("bad auth_len gid %ld str %ld auth %u\n",
 119                             (long)gid_len, (long)str_len, auth_len);
 120                         stat = AUTH_BADCRED;
 121                         goto done;
 122                 }
 123         } else if (! xdr_authunix_parms(&xdrs, aup)) {
 124                 xdrs.x_op = XDR_FREE;
 125                 (void)xdr_authunix_parms(&xdrs, aup);
 126                 stat = AUTH_BADCRED;
 127                 goto done;
 128         }
 129         rqst->rq_xprt->xp_verf.oa_flavor = AUTH_NULL;
 130         rqst->rq_xprt->xp_verf.oa_length = 0;
 131         stat = AUTH_OK;
 132 done:
 133         XDR_DESTROY(&xdrs);
 134         return (stat);
 135 }
 136
 137
 138 /*
 139  * Shorthand unix authenticator
 140  * Looks up longhand in a cache.
 141  */
 142 /*ARGSUSED*/
 143 enum auth_stat
 144 _svcauth_short(rqst, msg)
 145         struct svc_req *rqst;
 146         struct rpc_msg *msg;
 147 {
 148         return (AUTH_REJECTEDCRED);
 149 }