1 /*- 2 * SPDX-License-Identifier: BSD-4-Clause 3 * 4 * Copyright (c) 1995, 1996 5 * Bill Paul <wpaul@ctr.columbia.edu>. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by Bill Paul. 18 * 4. Neither the name of the author nor the names of any co-contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL Bill Paul OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * ypupdate server implementation 35 * 36 * Written by Bill Paul <wpaul@ctr.columbia.edu> 37 * Center for Telecommunications Research 38 * Columbia University, New York City 39 */ 40 41 #include <sys/cdefs.h> 42 #include <stdio.h> 43 #include <rpc/rpc.h> 44 #include <rpc/key_prot.h> 45 #include <sys/param.h> 46 #include <rpcsvc/yp.h> 47 #include "ypupdate_prot.h" 48 #include "ypupdated_extern.h" 49 #include "yp_extern.h" 50 #include "ypxfr_extern.h" 51 52 int children = 0; 53 int forked = 0; 54 55 /* 56 * Try to avoid spoofing: if a client chooses to use a very large 57 * window and then tries a bunch of randomly chosen encrypted timestamps, 58 * there's a chance he might stumble onto a valid combination. 59 * We therefore reject any RPCs with a window size larger than a preset 60 * value. 61 */ 62 #ifndef WINDOW 63 #define WINDOW (60*60) 64 #endif 65 66 static enum auth_stat 67 yp_checkauth(struct svc_req *svcreq) 68 { 69 struct authdes_cred *des_cred; 70 71 switch (svcreq->rq_cred.oa_flavor) { 72 case AUTH_DES: 73 des_cred = (struct authdes_cred *) svcreq->rq_clntcred; 74 if (des_cred->adc_fullname.window > WINDOW) { 75 yp_error("warning: client-specified window size \ 76 was too large -- possible spoof attempt"); 77 return(AUTH_BADCRED); 78 } 79 return(AUTH_OK); 80 break; 81 case AUTH_UNIX: 82 case AUTH_NONE: 83 yp_error("warning: client didn't use DES authentication"); 84 return(AUTH_TOOWEAK); 85 break; 86 default: 87 yp_error("client used unknown auth flavor"); 88 return(AUTH_REJECTEDCRED); 89 break; 90 } 91 } 92 93 unsigned int * 94 ypu_change_1_svc(struct ypupdate_args *args, struct svc_req *svcreq) 95 { 96 struct authdes_cred *des_cred; 97 static int res; 98 char *netname; 99 enum auth_stat astat; 100 101 res = 0; 102 103 astat = yp_checkauth(svcreq); 104 105 if (astat != AUTH_OK) { 106 svcerr_auth(svcreq->rq_xprt, astat); 107 return(&res); 108 } 109 110 des_cred = (struct authdes_cred *) svcreq->rq_clntcred; 111 netname = des_cred->adc_fullname.name; 112 113 res = localupdate(netname, "/etc/publickey", YPOP_CHANGE, 114 args->key.yp_buf_len, args->key.yp_buf_val, 115 args->datum.yp_buf_len, args->datum.yp_buf_val); 116 117 if (res) 118 return (&res); 119 120 res = ypmap_update(netname, args->mapname, YPOP_CHANGE, 121 args->key.yp_buf_len, args->key.yp_buf_val, 122 args->datum.yp_buf_len, args->datum.yp_buf_val); 123 124 return (&res); 125 } 126 127 unsigned int * 128 ypu_insert_1_svc(struct ypupdate_args *args, struct svc_req *svcreq) 129 { 130 struct authdes_cred *des_cred; 131 static int res; 132 char *netname; 133 enum auth_stat astat; 134 135 res = 0; 136 137 astat = yp_checkauth(svcreq); 138 139 if (astat != AUTH_OK) { 140 svcerr_auth(svcreq->rq_xprt, astat); 141 return(&res); 142 } 143 144 des_cred = (struct authdes_cred *) svcreq->rq_clntcred; 145 netname = des_cred->adc_fullname.name; 146 147 res = localupdate(netname, "/etc/publickey", YPOP_INSERT, 148 args->key.yp_buf_len, args->key.yp_buf_val, 149 args->datum.yp_buf_len, args->datum.yp_buf_val); 150 151 if (res) 152 return (&res); 153 154 res = ypmap_update(netname, args->mapname, YPOP_INSERT, 155 args->key.yp_buf_len, args->key.yp_buf_val, 156 args->datum.yp_buf_len, args->datum.yp_buf_val); 157 158 return (&res); 159 } 160 161 unsigned int * 162 ypu_delete_1_svc(struct ypdelete_args *args, struct svc_req *svcreq) 163 { 164 struct authdes_cred *des_cred; 165 static int res; 166 char *netname; 167 enum auth_stat astat; 168 169 res = 0; 170 171 astat = yp_checkauth(svcreq); 172 173 if (astat != AUTH_OK) { 174 svcerr_auth(svcreq->rq_xprt, astat); 175 return(&res); 176 } 177 178 des_cred = (struct authdes_cred *) svcreq->rq_clntcred; 179 netname = des_cred->adc_fullname.name; 180 181 res = localupdate(netname, "/etc/publickey", YPOP_DELETE, 182 args->key.yp_buf_len, args->key.yp_buf_val, 183 0, NULL); 184 185 if (res) 186 return (&res); 187 188 res = ypmap_update(netname, args->mapname, YPOP_DELETE, 189 args->key.yp_buf_len, args->key.yp_buf_val, 190 0, NULL); 191 192 return (&res); 193 } 194 195 unsigned int * 196 ypu_store_1_svc(struct ypupdate_args *args, struct svc_req *svcreq) 197 { 198 struct authdes_cred *des_cred; 199 static int res; 200 char *netname; 201 enum auth_stat astat; 202 203 res = 0; 204 205 astat = yp_checkauth(svcreq); 206 207 if (astat != AUTH_OK) { 208 svcerr_auth(svcreq->rq_xprt, astat); 209 return(&res); 210 } 211 212 des_cred = (struct authdes_cred *) svcreq->rq_clntcred; 213 netname = des_cred->adc_fullname.name; 214 215 res = localupdate(netname, "/etc/publickey", YPOP_STORE, 216 args->key.yp_buf_len, args->key.yp_buf_val, 217 args->datum.yp_buf_len, args->datum.yp_buf_val); 218 219 if (res) 220 return (&res); 221 222 res = ypmap_update(netname, args->mapname, YPOP_STORE, 223 args->key.yp_buf_len, args->key.yp_buf_val, 224 args->datum.yp_buf_len, args->datum.yp_buf_val); 225 226 return (&res); 227 } 228