3 * Bill Paul <wpaul@ctr.columbia.edu>. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
32 * $FreeBSD: src/usr.sbin/ypserv/yp_access.c,v 1.17.2.1 2002/02/15 00:47:00 des Exp $
33 * $DragonFly: src/usr.sbin/ypserv/yp_access.c,v 1.4 2004/03/31 23:20:22 cpressey Exp $
38 #include <rpcsvc/yp.h>
39 #include <rpcsvc/yppasswd.h>
40 #include <rpcsvc/ypxfrd.h>
41 #include <sys/types.h>
44 #include <sys/socket.h>
45 #include <netinet/in.h>
46 #include <arpa/inet.h>
48 #include <sys/fcntl.h>
51 #include <sys/param.h>
52 #include "yp_extern.h"
60 char *yp_procs[] = { "ypoldproc_null",
62 "ypoldproc_domain_nonack",
69 "badproc1", /* placeholder */
70 "badproc2", /* placeholder */
71 "badproc3", /* placeholder */
76 "ypproc_domain_nonack",
98 struct securenet *next;
101 struct securenet *securenets;
103 #define LINEBUFSZ 1024
106 * Read /var/yp/securenets file and initialize the securenets
107 * list. If the file doesn't exist, we set up a dummy entry that
108 * allows all hosts to connect.
111 load_securenets(void)
114 char path[MAXPATHLEN + 2];
115 char linebuf[1024 + 2];
116 struct securenet *tmp;
119 * If securenets is not NULL, we are being called to reload
120 * the list; free the existing list before re-reading the
124 tmp = securenets->next;
129 snprintf(path, MAXPATHLEN, "%s/securenets", yp_dir);
131 if ((fp = fopen(path, "r")) == NULL) {
132 if (errno == ENOENT) {
133 securenets = (struct securenet *)malloc(sizeof(struct securenet));
134 securenets->net.s_addr = INADDR_ANY;
135 securenets->mask.s_addr = INADDR_ANY;
136 securenets->next = NULL;
139 yp_error("fopen(%s) failed: %s", path, strerror(errno));
146 while (fgets(linebuf, LINEBUFSZ, fp)) {
147 char addr1[20], addr2[20];
149 if ((linebuf[0] == '#')
150 || (strspn(linebuf, " \t\r\n") == strlen(linebuf)))
152 if (sscanf(linebuf, "%s %s", addr1, addr2) < 2) {
153 yp_error("badly formatted securenets entry: %s",
158 tmp = (struct securenet *)malloc(sizeof(struct securenet));
160 if (!inet_aton((char *)&addr1, (struct in_addr *)&tmp->net)) {
161 yp_error("badly formatted securenets entry: %s", addr1);
166 if (!inet_aton((char *)&addr2, (struct in_addr *)&tmp->mask)) {
167 yp_error("badly formatted securenets entry: %s", addr2);
172 tmp->next = securenets;
182 * Access control functions.
184 * yp_access() checks the mapname and client host address and watches for
185 * the following things:
187 * - If the client is referencing one of the master.passwd.* maps, it must
188 * be using a privileged port to make its RPC to us. If it is, then we can
189 * assume that the caller is root and allow the RPC to succeed. If it
190 * isn't access is denied.
192 * - The client's IP address is checked against the securenets rules.
193 * There are two kinds of securenets support: the built-in support,
194 * which is very simple and depends on the presence of a
195 * /var/yp/securenets file, and tcp-wrapper support, which requires
196 * Wietse Venema's libwrap.a and tcpd.h. (Since the tcp-wrapper
197 * package does not ship with FreeBSD, we use the built-in support
198 * by default. Users can recompile the server with the tcp-wrapper library
199 * if they already have it installed and want to use hosts.allow and
200 * hosts.deny to control access instead of having a separate securenets
203 * If no /var/yp/securenets file is present, the host access checks
204 * are bypassed and all hosts are allowed to connect.
206 * The yp_validdomain() function checks the domain specified by the caller
207 * to make sure it's actually served by this server. This is more a sanity
208 * check than an a security check, but this seems to be the best place for
214 yp_access(const char *map, const char *domain, const struct svc_req *rqstp)
217 yp_access(const char *map, const struct svc_req *rqstp)
220 struct sockaddr_in *rqhost;
222 static unsigned long oldaddr = 0;
224 struct securenet *tmp;
226 char *yp_procedure = NULL;
229 if (rqstp->rq_prog != YPPASSWDPROG && rqstp->rq_prog != YPPROG) {
230 snprintf(procbuf, sizeof(procbuf), "#%lu/#%lu", rqstp->rq_prog,
232 yp_procedure = (char *)&procbuf;
234 yp_procedure = rqstp->rq_prog == YPPASSWDPROG ?
235 "yppasswdprog_update" :
236 yp_procs[rqstp->rq_proc + (12 * (rqstp->rq_vers - 1))];
239 rqhost = svc_getcaller(rqstp->rq_xprt);
242 yp_error("procedure %s called from %s:%d", yp_procedure,
243 inet_ntoa(rqhost->sin_addr),
244 ntohs(rqhost->sin_port));
246 yp_error("client is referencing map \"%s\".", map);
249 /* Check the map name if one was supplied. */
251 if (strchr(map, '/')) {
252 yp_error("embedded slash in map name \"%s\" -- \
253 possible spoof attempt from %s:%d",
254 map, inet_ntoa(rqhost->sin_addr),
255 ntohs(rqhost->sin_port));
259 if ((yp_testflag((char *)map, (char *)domain, YP_SECURE) ||
261 if ((strstr(map, "master.passwd.") ||
263 (rqstp->rq_prog == YPPROG &&
264 rqstp->rq_proc == YPPROC_XFR) ||
265 (rqstp->rq_prog == YPXFRD_FREEBSD_PROG &&
266 rqstp->rq_proc == YPXFRD_GETMAP)) &&
267 ntohs(rqhost->sin_port) >= IPPORT_RESERVED) {
268 yp_error("access to %s denied -- client %s:%d \
269 not privileged", map, inet_ntoa(rqhost->sin_addr), ntohs(rqhost->sin_port));
275 status = hosts_ctl("ypserv", STRING_UNKNOWN,
276 inet_ntoa(rqhost->sin_addr), "");
280 if (((rqhost->sin_addr.s_addr & ~tmp->mask.s_addr)
281 | tmp->net.s_addr) == rqhost->sin_addr.s_addr) {
290 if (rqhost->sin_addr.s_addr != oldaddr) {
291 yp_error("connect from %s:%d to procedure %s refused",
292 inet_ntoa(rqhost->sin_addr),
293 ntohs(rqhost->sin_port),
295 oldaddr = rqhost->sin_addr.s_addr;
304 yp_validdomain(const char *domain)
307 char dompath[MAXPATHLEN + 2];
309 if (domain == NULL || strstr(domain, "binding") ||
310 !strcmp(domain, ".") || !strcmp(domain, "..") ||
311 strchr(domain, '/') || strlen(domain) > YPMAXDOMAIN)
314 snprintf(dompath, sizeof(dompath), "%s/%s", yp_dir, domain);
316 if (stat(dompath, &statbuf) < 0 || !S_ISDIR(statbuf.st_mode))