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 1.3.2.1 2002/02/15 00:46:58 des 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/auth_des.h>
  45 #include <rpc/key_prot.h>
  46 #include <sys/param.h>
  47 #include <sys/cdefs.h>
  48 #include <rpcsvc/yp.h>
  49 #include "ypupdate_prot.h"
  50 #include "ypupdated_extern.h"
  51 #include "yp_extern.h"
  52 #include "ypxfr_extern.h"
  53
  54 int children = 0;
  55 int forked = 0;
  56
  57 /*
  58  * Try to avoid spoofing: if a client chooses to use a very large
  59  * window and then tries a bunch of randomly chosen encrypted timestamps,
  60  * there's a chance he might stumble onto a valid combination.
  61  * We therefore reject any RPCs with a window size larger than a preset
  62  * value.
  63  */
  64 #ifndef WINDOW
  65 #define WINDOW (60*60)
  66 #endif
  67
  68 static enum auth_stat
  69 yp_checkauth(struct svc_req *svcreq)
  70 {
  71         struct authdes_cred *des_cred;
  72
  73         switch (svcreq->rq_cred.oa_flavor) {
  74         case AUTH_DES:
  75                 des_cred = (struct authdes_cred *) svcreq->rq_clntcred;
  76                 if (des_cred->adc_fullname.window > WINDOW) {
  77                         yp_error("warning: client-specified window size \
  78 was too large -- possible spoof attempt");
  79                         return(AUTH_BADCRED);
  80                 }
  81                 return(AUTH_OK);
  82                 break;
  83         case AUTH_UNIX:
  84         case AUTH_NONE:
  85                 yp_error("warning: client didn't use DES authentication");
  86                 return(AUTH_TOOWEAK);
  87                 break;
  88         default:
  89                 yp_error("client used unknown auth flavor");
  90                 return(AUTH_REJECTEDCRED);
  91                 break;
  92         }
  93 }
  94
  95 unsigned int *
  96 ypu_change_1_svc(struct ypupdate_args *args, struct svc_req *svcreq)
  97 {
  98         struct authdes_cred *des_cred;
  99         static int res;
 100         char *netname;
 101         enum auth_stat astat;
 102
 103         res = 0;
 104
 105         astat = yp_checkauth(svcreq);
 106
 107         if (astat != AUTH_OK) {
 108                 svcerr_auth(svcreq->rq_xprt, astat);
 109                 return(&res);
 110         }
 111
 112         des_cred = (struct authdes_cred *) svcreq->rq_clntcred;
 113         netname = des_cred->adc_fullname.name;
 114
 115         res = localupdate(netname, "/etc/publickey", YPOP_CHANGE,
 116                 args->key.yp_buf_len, args->key.yp_buf_val,
 117                 args->datum.yp_buf_len, args->datum.yp_buf_val);
 118
 119         if (res)
 120                 return (&res);
 121
 122         res = ypmap_update(netname, args->mapname, YPOP_CHANGE,
 123                 args->key.yp_buf_len, args->key.yp_buf_val,
 124                 args->datum.yp_buf_len, args->datum.yp_buf_val);
 125
 126         return (&res);
 127 }
 128
 129 unsigned int *
 130 ypu_insert_1_svc(struct ypupdate_args *args, struct svc_req *svcreq)
 131 {
 132         struct authdes_cred *des_cred;
 133         static int res;
 134         char *netname;
 135         enum auth_stat astat;
 136
 137         res = 0;
 138
 139         astat = yp_checkauth(svcreq);
 140
 141         if (astat != AUTH_OK) {
 142                 svcerr_auth(svcreq->rq_xprt, astat);
 143                 return(&res);
 144         }
 145
 146         des_cred = (struct authdes_cred *) svcreq->rq_clntcred;
 147         netname = des_cred->adc_fullname.name;
 148
 149         res = localupdate(netname, "/etc/publickey", YPOP_INSERT,
 150                 args->key.yp_buf_len, args->key.yp_buf_val,
 151                 args->datum.yp_buf_len, args->datum.yp_buf_val);
 152
 153         if (res)
 154                 return (&res);
 155
 156         res = ypmap_update(netname, args->mapname, YPOP_INSERT,
 157                 args->key.yp_buf_len, args->key.yp_buf_val,
 158                 args->datum.yp_buf_len, args->datum.yp_buf_val);
 159
 160         return (&res);
 161 }
 162
 163 unsigned int *
 164 ypu_delete_1_svc(struct ypdelete_args *args, struct svc_req *svcreq)
 165 {
 166         struct authdes_cred *des_cred;
 167         static int res;
 168         char *netname;
 169         enum auth_stat astat;
 170
 171         res = 0;
 172
 173         astat = yp_checkauth(svcreq);
 174
 175         if (astat != AUTH_OK) {
 176                 svcerr_auth(svcreq->rq_xprt, astat);
 177                 return(&res);
 178         }
 179
 180         des_cred = (struct authdes_cred *) svcreq->rq_clntcred;
 181         netname = des_cred->adc_fullname.name;
 182
 183         res = localupdate(netname, "/etc/publickey", YPOP_DELETE,
 184                 args->key.yp_buf_len, args->key.yp_buf_val,
 185                 0,                      NULL);
 186
 187         if (res)
 188                 return (&res);
 189
 190         res = ypmap_update(netname, args->mapname, YPOP_DELETE,
 191                 args->key.yp_buf_len, args->key.yp_buf_val,
 192                 0,                      NULL);
 193
 194         return (&res);
 195 }
 196
 197 unsigned int *
 198 ypu_store_1_svc(struct ypupdate_args *args, struct svc_req *svcreq)
 199 {
 200         struct authdes_cred *des_cred;
 201         static int res;
 202         char *netname;
 203         enum auth_stat astat;
 204
 205         res = 0;
 206
 207         astat = yp_checkauth(svcreq);
 208
 209         if (astat != AUTH_OK) {
 210                 svcerr_auth(svcreq->rq_xprt, astat);
 211                 return(&res);
 212         }
 213
 214         des_cred = (struct authdes_cred *) svcreq->rq_clntcred;
 215         netname = des_cred->adc_fullname.name;
 216
 217         res = localupdate(netname, "/etc/publickey", YPOP_STORE,
 218                 args->key.yp_buf_len, args->key.yp_buf_val,
 219                 args->datum.yp_buf_len, args->datum.yp_buf_val);
 220
 221         if (res)
 222                 return (&res);
 223
 224         res = ypmap_update(netname, args->mapname, YPOP_STORE,
 225                 args->key.yp_buf_len, args->key.yp_buf_val,
 226                 args->datum.yp_buf_len, args->datum.yp_buf_val);
 227
 228         return (&res);
 229 }