usr.sbin/rpc.ypupdated/ypupdated_server.c

   1 /*
   2  * Copyright (c) 1995, 1996
   3  *      Bill Paul <wpaul@ctr.columbia.edu>.  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
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by Bill Paul.
  16  * 4. Neither the name of the author nor the names of any co-contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL Bill Paul OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  * ypupdate server implementation
  33  *
  34  * Written by Bill Paul <wpaul@ctr.columbia.edu>
  35  * Center for Telecommunications Research
  36  * Columbia University, New York City
  37  *
  38  * $FreeBSD: src/usr.sbin/rpc.ypupdated/ypupdated_server.c,v 1.7 2003/05/03 21:06:40 obrien Exp $
  39  */
  40
  41 #include <stdio.h>
  42 #include <rpc/rpc.h>
  43 #include <rpc/key_prot.h>
  44 #include <sys/param.h>
  45 #include <rpcsvc/yp.h>
  46 #include "ypupdate_prot.h"
  47 #include "ypupdated_extern.h"
  48 #include "yp_extern.h"
  49 #include "ypxfr_extern.h"
  50
  51 int children = 0;
  52 int forked = 0;
  53
  54 /*
  55  * Try to avoid spoofing: if a client chooses to use a very large
  56  * window and then tries a bunch of randomly chosen encrypted timestamps,
  57  * there's a chance he might stumble onto a valid combination.
  58  * We therefore reject any RPCs with a window size larger than a preset
  59  * value.
  60  */
  61 #ifndef WINDOW
  62 #define WINDOW (60*60)
  63 #endif
  64
  65 static enum auth_stat
  66 yp_checkauth(struct svc_req *svcreq)
  67 {
  68         struct authdes_cred *des_cred;
  69
  70         switch (svcreq->rq_cred.oa_flavor) {
  71         case AUTH_DES:
  72                 des_cred = (struct authdes_cred *) svcreq->rq_clntcred;
  73                 if (des_cred->adc_fullname.window > WINDOW) {
  74                         yp_error("warning: client-specified window size \
  75 was too large -- possible spoof attempt");
  76                         return(AUTH_BADCRED);
  77                 }
  78                 return(AUTH_OK);
  79                 break;
  80         case AUTH_UNIX:
  81         case AUTH_NONE:
  82                 yp_error("warning: client didn't use DES authentication");
  83                 return(AUTH_TOOWEAK);
  84                 break;
  85         default:
  86                 yp_error("client used unknown auth flavor");
  87                 return(AUTH_REJECTEDCRED);
  88                 break;
  89         }
  90 }
  91
  92 unsigned int *
  93 ypu_change_1_svc(struct ypupdate_args *args, struct svc_req *svcreq)
  94 {
  95         struct authdes_cred *des_cred;
  96         static int res;
  97         char *netname;
  98         enum auth_stat astat;
  99
 100         res = 0;
 101
 102         astat = yp_checkauth(svcreq);
 103
 104         if (astat != AUTH_OK) {
 105                 svcerr_auth(svcreq->rq_xprt, astat);
 106                 return(&res);
 107         }
 108
 109         des_cred = (struct authdes_cred *) svcreq->rq_clntcred;
 110         netname = des_cred->adc_fullname.name;
 111
 112         res = localupdate(netname, "/etc/publickey", YPOP_CHANGE,
 113                 args->key.yp_buf_len, args->key.yp_buf_val,
 114                 args->datum.yp_buf_len, args->datum.yp_buf_val);
 115
 116         if (res)
 117                 return (&res);
 118
 119         res = ypmap_update(netname, args->mapname, YPOP_CHANGE,
 120                 args->key.yp_buf_len, args->key.yp_buf_val,
 121                 args->datum.yp_buf_len, args->datum.yp_buf_val);
 122
 123         return (&res);
 124 }
 125
 126 unsigned int *
 127 ypu_insert_1_svc(struct ypupdate_args *args, struct svc_req *svcreq)
 128 {
 129         struct authdes_cred *des_cred;
 130         static int res;
 131         char *netname;
 132         enum auth_stat astat;
 133
 134         res = 0;
 135
 136         astat = yp_checkauth(svcreq);
 137
 138         if (astat != AUTH_OK) {
 139                 svcerr_auth(svcreq->rq_xprt, astat);
 140                 return(&res);
 141         }
 142
 143         des_cred = (struct authdes_cred *) svcreq->rq_clntcred;
 144         netname = des_cred->adc_fullname.name;
 145
 146         res = localupdate(netname, "/etc/publickey", YPOP_INSERT,
 147                 args->key.yp_buf_len, args->key.yp_buf_val,
 148                 args->datum.yp_buf_len, args->datum.yp_buf_val);
 149
 150         if (res)
 151                 return (&res);
 152
 153         res = ypmap_update(netname, args->mapname, YPOP_INSERT,
 154                 args->key.yp_buf_len, args->key.yp_buf_val,
 155                 args->datum.yp_buf_len, args->datum.yp_buf_val);
 156
 157         return (&res);
 158 }
 159
 160 unsigned int *
 161 ypu_delete_1_svc(struct ypdelete_args *args, struct svc_req *svcreq)
 162 {
 163         struct authdes_cred *des_cred;
 164         static int res;
 165         char *netname;
 166         enum auth_stat astat;
 167
 168         res = 0;
 169
 170         astat = yp_checkauth(svcreq);
 171
 172         if (astat != AUTH_OK) {
 173                 svcerr_auth(svcreq->rq_xprt, astat);
 174                 return(&res);
 175         }
 176
 177         des_cred = (struct authdes_cred *) svcreq->rq_clntcred;
 178         netname = des_cred->adc_fullname.name;
 179
 180         res = localupdate(netname, "/etc/publickey", YPOP_DELETE,
 181                 args->key.yp_buf_len, args->key.yp_buf_val,
 182                 0,                      NULL);
 183
 184         if (res)
 185                 return (&res);
 186
 187         res = ypmap_update(netname, args->mapname, YPOP_DELETE,
 188                 args->key.yp_buf_len, args->key.yp_buf_val,
 189                 0,                      NULL);
 190
 191         return (&res);
 192 }
 193
 194 unsigned int *
 195 ypu_store_1_svc(struct ypupdate_args *args, struct svc_req *svcreq)
 196 {
 197         struct authdes_cred *des_cred;
 198         static int res;
 199         char *netname;
 200         enum auth_stat astat;
 201
 202         res = 0;
 203
 204         astat = yp_checkauth(svcreq);
 205
 206         if (astat != AUTH_OK) {
 207                 svcerr_auth(svcreq->rq_xprt, astat);
 208                 return(&res);
 209         }
 210
 211         des_cred = (struct authdes_cred *) svcreq->rq_clntcred;
 212         netname = des_cred->adc_fullname.name;
 213
 214         res = localupdate(netname, "/etc/publickey", YPOP_STORE,
 215                 args->key.yp_buf_len, args->key.yp_buf_val,
 216                 args->datum.yp_buf_len, args->datum.yp_buf_val);
 217
 218         if (res)
 219                 return (&res);
 220
 221         res = ypmap_update(netname, args->mapname, YPOP_STORE,
 222                 args->key.yp_buf_len, args->key.yp_buf_val,
 223                 args->datum.yp_buf_len, args->datum.yp_buf_val);
 224
 225         return (&res);
 226 }