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  * $DragonFly: src/usr.sbin/rpc.ypupdated/ypupdated_server.c,v 1.3 2005/11/25 00:32:49 swildner Exp $
  40  */
  41
  42 #include <stdio.h>
  43 #include <rpc/rpc.h>
  44 #include <rpc/key_prot.h>
  45 #include <sys/param.h>
  46 #include <sys/cdefs.h>
  47 #include <rpcsvc/yp.h>
  48 #include "ypupdate_prot.h"
  49 #include "ypupdated_extern.h"
  50 #include "yp_extern.h"
  51 #include "ypxfr_extern.h"
  52
  53 int children = 0;
  54 int forked = 0;
  55
  56 /*
  57  * Try to avoid spoofing: if a client chooses to use a very large
  58  * window and then tries a bunch of randomly chosen encrypted timestamps,
  59  * there's a chance he might stumble onto a valid combination.
  60  * We therefore reject any RPCs with a window size larger than a preset
  61  * value.
  62  */
  63 #ifndef WINDOW
  64 #define WINDOW (60*60)
  65 #endif
  66
  67 static enum auth_stat
  68 yp_checkauth(struct svc_req *svcreq)
  69 {
  70         struct authdes_cred *des_cred;
  71
  72         switch (svcreq->rq_cred.oa_flavor) {
  73         case AUTH_DES:
  74                 des_cred = (struct authdes_cred *) svcreq->rq_clntcred;
  75                 if (des_cred->adc_fullname.window > WINDOW) {
  76                         yp_error("warning: client-specified window size \
  77 was too large -- possible spoof attempt");
  78                         return(AUTH_BADCRED);
  79                 }
  80                 return(AUTH_OK);
  81                 break;
  82         case AUTH_UNIX:
  83         case AUTH_NONE:
  84                 yp_error("warning: client didn't use DES authentication");
  85                 return(AUTH_TOOWEAK);
  86                 break;
  87         default:
  88                 yp_error("client used unknown auth flavor");
  89                 return(AUTH_REJECTEDCRED);
  90                 break;
  91         }
  92 }
  93
  94 unsigned int *
  95 ypu_change_1_svc(struct ypupdate_args *args, struct svc_req *svcreq)
  96 {
  97         struct authdes_cred *des_cred;
  98         static int res;
  99         char *netname;
 100         enum auth_stat astat;
 101
 102         res = 0;
 103
 104         astat = yp_checkauth(svcreq);
 105
 106         if (astat != AUTH_OK) {
 107                 svcerr_auth(svcreq->rq_xprt, astat);
 108                 return(&res);
 109         }
 110
 111         des_cred = (struct authdes_cred *) svcreq->rq_clntcred;
 112         netname = des_cred->adc_fullname.name;
 113
 114         res = localupdate(netname, "/etc/publickey", YPOP_CHANGE,
 115                 args->key.yp_buf_len, args->key.yp_buf_val,
 116                 args->datum.yp_buf_len, args->datum.yp_buf_val);
 117
 118         if (res)
 119                 return (&res);
 120
 121         res = ypmap_update(netname, args->mapname, YPOP_CHANGE,
 122                 args->key.yp_buf_len, args->key.yp_buf_val,
 123                 args->datum.yp_buf_len, args->datum.yp_buf_val);
 124
 125         return (&res);
 126 }
 127
 128 unsigned int *
 129 ypu_insert_1_svc(struct ypupdate_args *args, struct svc_req *svcreq)
 130 {
 131         struct authdes_cred *des_cred;
 132         static int res;
 133         char *netname;
 134         enum auth_stat astat;
 135
 136         res = 0;
 137
 138         astat = yp_checkauth(svcreq);
 139
 140         if (astat != AUTH_OK) {
 141                 svcerr_auth(svcreq->rq_xprt, astat);
 142                 return(&res);
 143         }
 144
 145         des_cred = (struct authdes_cred *) svcreq->rq_clntcred;
 146         netname = des_cred->adc_fullname.name;
 147
 148         res = localupdate(netname, "/etc/publickey", YPOP_INSERT,
 149                 args->key.yp_buf_len, args->key.yp_buf_val,
 150                 args->datum.yp_buf_len, args->datum.yp_buf_val);
 151
 152         if (res)
 153                 return (&res);
 154
 155         res = ypmap_update(netname, args->mapname, YPOP_INSERT,
 156                 args->key.yp_buf_len, args->key.yp_buf_val,
 157                 args->datum.yp_buf_len, args->datum.yp_buf_val);
 158
 159         return (&res);
 160 }
 161
 162 unsigned int *
 163 ypu_delete_1_svc(struct ypdelete_args *args, struct svc_req *svcreq)
 164 {
 165         struct authdes_cred *des_cred;
 166         static int res;
 167         char *netname;
 168         enum auth_stat astat;
 169
 170         res = 0;
 171
 172         astat = yp_checkauth(svcreq);
 173
 174         if (astat != AUTH_OK) {
 175                 svcerr_auth(svcreq->rq_xprt, astat);
 176                 return(&res);
 177         }
 178
 179         des_cred = (struct authdes_cred *) svcreq->rq_clntcred;
 180         netname = des_cred->adc_fullname.name;
 181
 182         res = localupdate(netname, "/etc/publickey", YPOP_DELETE,
 183                 args->key.yp_buf_len, args->key.yp_buf_val,
 184                 0,                      NULL);
 185
 186         if (res)
 187                 return (&res);
 188
 189         res = ypmap_update(netname, args->mapname, YPOP_DELETE,
 190                 args->key.yp_buf_len, args->key.yp_buf_val,
 191                 0,                      NULL);
 192
 193         return (&res);
 194 }
 195
 196 unsigned int *
 197 ypu_store_1_svc(struct ypupdate_args *args, struct svc_req *svcreq)
 198 {
 199         struct authdes_cred *des_cred;
 200         static int res;
 201         char *netname;
 202         enum auth_stat astat;
 203
 204         res = 0;
 205
 206         astat = yp_checkauth(svcreq);
 207
 208         if (astat != AUTH_OK) {
 209                 svcerr_auth(svcreq->rq_xprt, astat);
 210                 return(&res);
 211         }
 212
 213         des_cred = (struct authdes_cred *) svcreq->rq_clntcred;
 214         netname = des_cred->adc_fullname.name;
 215
 216         res = localupdate(netname, "/etc/publickey", YPOP_STORE,
 217                 args->key.yp_buf_len, args->key.yp_buf_val,
 218                 args->datum.yp_buf_len, args->datum.yp_buf_val);
 219
 220         if (res)
 221                 return (&res);
 222
 223         res = ypmap_update(netname, args->mapname, YPOP_STORE,
 224                 args->key.yp_buf_len, args->key.yp_buf_val,
 225                 args->datum.yp_buf_len, args->datum.yp_buf_val);
 226
 227         return (&res);
 228 }