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
yp_checkauth(struct svc_req * svcreq)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 *
ypu_change_1_svc(struct ypupdate_args * args,struct svc_req * svcreq)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 *
ypu_insert_1_svc(struct ypupdate_args * args,struct svc_req * svcreq)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 *
ypu_delete_1_svc(struct ypdelete_args * args,struct svc_req * svcreq)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 *
ypu_store_1_svc(struct ypupdate_args * args,struct svc_req * svcreq)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 }
227