lib/libc/rpc/svc_auth_unix.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  * @(#)svc_auth_unix.c 1.28 88/02/08 Copyr 1984 Sun Micro
  30  * @(#)svc_auth_unix.c  2.3 88/08/01 4.0 RPCSRC
  31  * $FreeBSD: src/lib/libc/rpc/svc_auth_unix.c,v 1.11 2004/10/16 06:11:35 obrien Exp $
  32  * $DragonFly: src/lib/libc/rpc/svc_auth_unix.c,v 1.4 2005/11/13 12:27:04 swildner Exp $
  33  */
  34
  35 /*
  36  * svc_auth_unix.c
  37  * Handles UNIX flavor authentication parameters on the service side of rpc.
  38  * There are two svc auth implementations here: AUTH_UNIX and AUTH_SHORT.
  39  * _svcauth_unix does full blown unix style uid,gid+gids auth,
  40  * _svcauth_short uses a shorthand auth to index into a cache of longhand auths.
  41  * Note: the shorthand has been gutted for efficiency.
  42  *
  43  * Copyright (C) 1984, Sun Microsystems, Inc.
  44  */
  45
  46 #include "namespace.h"
  47 #include <assert.h>
  48 #include <stdio.h>
  49 #include <string.h>
  50
  51 #include <rpc/rpc.h>
  52 #include "un-namespace.h"
  53
  54 /*
  55  * Unix longhand authenticator
  56  */
  57 enum auth_stat
  58 _svcauth_unix(struct svc_req *rqst, struct rpc_msg *msg)
  59 {
  60         enum auth_stat stat;
  61         XDR xdrs;
  62         struct authunix_parms *aup;
  63         int32_t *buf;
  64         struct area {
  65                 struct authunix_parms area_aup;
  66                 char area_machname[MAX_MACHINE_NAME+1];
  67                 int area_gids[NGRPS];
  68         } *area;
  69         u_int auth_len;
  70         size_t str_len, gid_len;
  71         u_int i;
  72
  73         assert(rqst != NULL);
  74         assert(msg != NULL);
  75
  76         area = (struct area *) rqst->rq_clntcred;
  77         aup = &area->area_aup;
  78         aup->aup_machname = area->area_machname;
  79         aup->aup_gids = area->area_gids;
  80         auth_len = (u_int)msg->rm_call.cb_cred.oa_length;
  81         xdrmem_create(&xdrs, msg->rm_call.cb_cred.oa_base, auth_len,XDR_DECODE);
  82         buf = XDR_INLINE(&xdrs, auth_len);
  83         if (buf != NULL) {
  84                 aup->aup_time = IXDR_GET_INT32(buf);
  85                 str_len = (size_t)IXDR_GET_U_INT32(buf);
  86                 if (str_len > MAX_MACHINE_NAME) {
  87                         stat = AUTH_BADCRED;
  88                         goto done;
  89                 }
  90                 memmove(aup->aup_machname, buf, str_len);
  91                 aup->aup_machname[str_len] = 0;
  92                 str_len = RNDUP(str_len);
  93                 buf += str_len / sizeof (int32_t);
  94                 aup->aup_uid = (int)IXDR_GET_INT32(buf);
  95                 aup->aup_gid = (int)IXDR_GET_INT32(buf);
  96                 gid_len = (size_t)IXDR_GET_U_INT32(buf);
  97                 if (gid_len > NGRPS) {
  98                         stat = AUTH_BADCRED;
  99                         goto done;
 100                 }
 101                 aup->aup_len = gid_len;
 102                 for (i = 0; i < gid_len; i++) {
 103                         aup->aup_gids[i] = (int)IXDR_GET_INT32(buf);
 104                 }
 105                 /*
 106                  * five is the smallest unix credentials structure -
 107                  * timestamp, hostname len (0), uid, gid, and gids len (0).
 108                  */
 109                 if ((5 + gid_len) * BYTES_PER_XDR_UNIT + str_len > auth_len) {
 110                         printf("bad auth_len gid %ld str %ld auth %u\n",
 111                             (long)gid_len, (long)str_len, auth_len);
 112                         stat = AUTH_BADCRED;
 113                         goto done;
 114                 }
 115         } else if (! xdr_authunix_parms(&xdrs, aup)) {
 116                 xdrs.x_op = XDR_FREE;
 117                 xdr_authunix_parms(&xdrs, aup);
 118                 stat = AUTH_BADCRED;
 119                 goto done;
 120         }
 121
 122        /* get the verifier */
 123         if ((u_int)msg->rm_call.cb_verf.oa_length) {
 124                 rqst->rq_xprt->xp_verf.oa_flavor =
 125                         msg->rm_call.cb_verf.oa_flavor;
 126                 rqst->rq_xprt->xp_verf.oa_base =
 127                         msg->rm_call.cb_verf.oa_base;
 128                 rqst->rq_xprt->xp_verf.oa_length =
 129                         msg->rm_call.cb_verf.oa_length;
 130         } else {
 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 }