lib/libc/rpc/svc_auth_unix.c

   1 /*-
   2  * Copyright (c) 2009, Sun Microsystems, Inc.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are met:
   7  * - Redistributions of source code must retain the above copyright notice,
   8  *   this list of conditions and the following disclaimer.
   9  * - Redistributions in binary form must reproduce the above copyright notice,
  10  *   this list of conditions and the following disclaimer in the documentation
  11  *   and/or other materials provided with the distribution.
  12  * - Neither the name of Sun Microsystems, Inc. nor the names of its
  13  *   contributors may be used to endorse or promote products derived
  14  *   from this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  17  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
  20  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  26  *
  27  * POSSIBILITY OF SUCH DAMAGE.
  28  * @(#)svc_auth_unix.c 1.28 88/02/08 Copyr 1984 Sun Micro
  29  * @(#)svc_auth_unix.c  2.3 88/08/01 4.0 RPCSRC
  30  * $FreeBSD: src/lib/libc/rpc/svc_auth_unix.c,v 1.11 2004/10/16 06:11:35 obrien Exp $
  31  */
  32
  33 /*
  34  * svc_auth_unix.c
  35  * Handles UNIX flavor authentication parameters on the service side of rpc.
  36  * There are two svc auth implementations here: AUTH_UNIX and AUTH_SHORT.
  37  * _svcauth_unix does full blown unix style uid,gid+gids auth,
  38  * _svcauth_short uses a shorthand auth to index into a cache of longhand auths.
  39  * Note: the shorthand has been gutted for efficiency.
  40  *
  41  * Copyright (C) 1984, Sun Microsystems, Inc.
  42  */
  43
  44 #include "namespace.h"
  45 #include <assert.h>
  46 #include <stdio.h>
  47 #include <string.h>
  48
  49 #include <rpc/rpc.h>
  50 #include "un-namespace.h"
  51
  52 /*
  53  * Unix longhand authenticator
  54  */
  55 enum auth_stat
  56 _svcauth_unix(struct svc_req *rqst, struct rpc_msg *msg)
  57 {
  58         enum auth_stat stat;
  59         XDR xdrs;
  60         struct authunix_parms *aup;
  61         int32_t *buf;
  62         struct area {
  63                 struct authunix_parms area_aup;
  64                 char area_machname[MAX_MACHINE_NAME+1];
  65                 int area_gids[NGRPS];
  66         } *area;
  67         u_int auth_len;
  68         size_t str_len, gid_len;
  69         u_int i;
  70
  71         assert(rqst != NULL);
  72         assert(msg != NULL);
  73
  74         area = (struct area *) rqst->rq_clntcred;
  75         aup = &area->area_aup;
  76         aup->aup_machname = area->area_machname;
  77         aup->aup_gids = area->area_gids;
  78         auth_len = (u_int)msg->rm_call.cb_cred.oa_length;
  79         xdrmem_create(&xdrs, msg->rm_call.cb_cred.oa_base, auth_len,XDR_DECODE);
  80         buf = XDR_INLINE(&xdrs, auth_len);
  81         if (buf != NULL) {
  82                 aup->aup_time = IXDR_GET_INT32(buf);
  83                 str_len = (size_t)IXDR_GET_U_INT32(buf);
  84                 if (str_len > MAX_MACHINE_NAME) {
  85                         stat = AUTH_BADCRED;
  86                         goto done;
  87                 }
  88                 memmove(aup->aup_machname, buf, str_len);
  89                 aup->aup_machname[str_len] = 0;
  90                 str_len = RNDUP(str_len);
  91                 buf += str_len / sizeof (int32_t);
  92                 aup->aup_uid = (int)IXDR_GET_INT32(buf);
  93                 aup->aup_gid = (int)IXDR_GET_INT32(buf);
  94                 gid_len = (size_t)IXDR_GET_U_INT32(buf);
  95                 if (gid_len > NGRPS) {
  96                         stat = AUTH_BADCRED;
  97                         goto done;
  98                 }
  99                 aup->aup_len = gid_len;
 100                 for (i = 0; i < gid_len; i++) {
 101                         aup->aup_gids[i] = (int)IXDR_GET_INT32(buf);
 102                 }
 103                 /*
 104                  * five is the smallest unix credentials structure -
 105                  * timestamp, hostname len (0), uid, gid, and gids len (0).
 106                  */
 107                 if ((5 + gid_len) * BYTES_PER_XDR_UNIT + str_len > auth_len) {
 108                         printf("bad auth_len gid %ld str %ld auth %u\n",
 109                             (long)gid_len, (long)str_len, auth_len);
 110                         stat = AUTH_BADCRED;
 111                         goto done;
 112                 }
 113         } else if (! xdr_authunix_parms(&xdrs, aup)) {
 114                 xdrs.x_op = XDR_FREE;
 115                 xdr_authunix_parms(&xdrs, aup);
 116                 stat = AUTH_BADCRED;
 117                 goto done;
 118         }
 119
 120        /* get the verifier */
 121         if ((u_int)msg->rm_call.cb_verf.oa_length) {
 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         } else {
 129                 rqst->rq_xprt->xp_verf.oa_flavor = AUTH_NULL;
 130                 rqst->rq_xprt->xp_verf.oa_length = 0;
 131         }
 132         stat = AUTH_OK;
 133 done:
 134         XDR_DESTROY(&xdrs);
 135         return (stat);
 136 }
 137
 138
 139 /*
 140  * Shorthand unix authenticator
 141  * Looks up longhand in a cache.
 142  */
 143 /*ARGSUSED*/
 144 enum auth_stat
 145 _svcauth_short(struct svc_req *rqst __unused, struct rpc_msg *msg __unused)
 146 {
 147         return (AUTH_REJECTEDCRED);
 148 }