1 /*
2 * SPDX-License-Identifier: BSD-4-Clause
3 *
4 * Copyright (c) 1995, 1996
5 * Bill Paul <[email protected]>. 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
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
37
38 #include <sys/param.h>
39 #include <sys/ioctl.h>
40 #include <sys/stat.h>
41 #include <sys/socket.h>
42 #include <sys/time.h>
43 #include <sys/resource.h>
44 #include <netinet/in.h>
45
46 #include <err.h>
47 #include <errno.h>
48 #include <fcntl.h>
49 #include <memory.h>
50 #include <signal.h>
51 #include <stdio.h>
52 #include <stdlib.h> /* getenv, exit */
53 #include <string.h> /* strcmp */
54 #include <syslog.h>
55 #include <unistd.h>
56
57 #include <rpc/rpc.h>
58 #include <rpc/rpc_com.h>
59 #include <rpc/pmap_clnt.h> /* for pmap_unset */
60 #include <rpcsvc/yp.h>
61 #include <rpcsvc/ypclnt.h>
62
63 #include "yppasswd.h"
64 #include "yppasswdd_extern.h"
65 #include "yppasswd_private.h"
66 #include "ypxfr_extern.h"
67 #include "yp_extern.h"
68
69 #ifndef SIG_PF
70 #define SIG_PF void(*)(int)
71 #endif
72
73 #ifdef DEBUG
74 #define RPC_SVC_FG
75 #endif
76
77 #define _RPCSVC_CLOSEDOWN 120
78 int _rpcpmstart = 0; /* Started by a port monitor ? */
79 static int _rpcfdtype;
80 /* Whether Stream or Datagram ? */
81 /* States a server can be in wrt request */
82
83 #define _IDLE 0
84 #define _SERVED 1
85 #define _SERVING 2
86
87 static char _localhost[] = "localhost";
88 static char _passwd_byname[] = "passwd.byname";
89 extern int _rpcsvcstate; /* Set when a request is serviced */
90 static char _progname[] = "rpc.yppasswdd";
91 char *progname = _progname;
92 static char _yp_dir[] = _PATH_YP;
93 char *yp_dir = _yp_dir;
94 static char _passfile_default[] = _PATH_YP "master.passwd";
95 char *passfile_default = _passfile_default;
96 char *passfile;
97 char *yppasswd_domain = NULL;
98 int no_chsh = 0;
99 int no_chfn = 0;
100 int allow_additions = 0;
101 int multidomain = 0;
102 int verbose = 0;
103 int resvport = 1;
104 int inplace = 0;
105 char sockname[] = YP_SOCKNAME;
106
107 static void
terminate(int sig __unused)108 terminate(int sig __unused)
109 {
110 rpcb_unset(YPPASSWDPROG, YPPASSWDVERS, NULL);
111 rpcb_unset(MASTER_YPPASSWDPROG, MASTER_YPPASSWDVERS, NULL);
112 unlink(sockname);
113 exit(0);
114 }
115
116 static void
reload(int sig __unused)117 reload(int sig __unused)
118 {
119 load_securenets();
120 }
121
122 static void
closedown(int sig __unused)123 closedown(int sig __unused)
124 {
125 if (_rpcsvcstate == _IDLE) {
126 extern fd_set svc_fdset;
127 static int size;
128 int i, openfd;
129
130 if (_rpcfdtype == SOCK_DGRAM) {
131 unlink(sockname);
132 exit(0);
133 }
134 if (size == 0) {
135 size = getdtablesize();
136 }
137 for (i = 0, openfd = 0; i < size && openfd < 2; i++)
138 if (FD_ISSET(i, &svc_fdset))
139 openfd++;
140 if (openfd <= 1) {
141 unlink(sockname);
142 exit(0);
143 }
144 }
145 if (_rpcsvcstate == _SERVED)
146 _rpcsvcstate = _IDLE;
147
148 (void) signal(SIGALRM, (SIG_PF) closedown);
149 (void) alarm(_RPCSVC_CLOSEDOWN/2);
150 }
151
152 static void
usage(void)153 usage(void)
154 {
155 fprintf(stderr, "%s\n%s\n",
156 "usage: rpc.yppasswdd [-t master.passwd file] [-d domain] [-p path] [-s]",
157 " [-f] [-m] [-i] [-a] [-v] [-u] [-h]");
158 exit(1);
159 }
160
161 int
main(int argc,char * argv[])162 main(int argc, char *argv[])
163 {
164 struct rlimit rlim;
165 SVCXPRT *transp = NULL;
166 struct sockaddr_in saddr;
167 socklen_t asize = sizeof (saddr);
168 struct netconfig *nconf;
169 struct sigaction sa;
170 void *localhandle;
171 int ch;
172 char *mastername;
173 char myname[MAXHOSTNAMELEN + 2];
174 int maxrec = RPC_MAXDATASIZE;
175
176 extern int debug;
177
178 debug = 1;
179
180 while ((ch = getopt(argc, argv, "t:d:p:sfamuivh")) != -1) {
181 switch (ch) {
182 case 't':
183 passfile_default = optarg;
184 break;
185 case 'd':
186 yppasswd_domain = optarg;
187 break;
188 case 's':
189 no_chsh++;
190 break;
191 case 'f':
192 no_chfn++;
193 break;
194 case 'p':
195 yp_dir = optarg;
196 break;
197 case 'a':
198 allow_additions++;
199 break;
200 case 'm':
201 multidomain++;
202 break;
203 case 'i':
204 inplace++;
205 break;
206 case 'v':
207 verbose++;
208 break;
209 case 'u':
210 resvport = 0;
211 break;
212 default:
213 case 'h':
214 usage();
215 break;
216 }
217 }
218
219 if (yppasswd_domain == NULL) {
220 if (yp_get_default_domain(&yppasswd_domain)) {
221 yp_error("no domain specified and system domain \
222 name isn't set -- aborting");
223 usage();
224 }
225 }
226
227 load_securenets();
228
229 if (getrpcport(_localhost, YPPROG, YPVERS, IPPROTO_UDP) <= 0) {
230 yp_error("no ypserv processes registered with local portmap");
231 yp_error("this host is not an NIS server -- aborting");
232 exit(1);
233 }
234
235 if ((mastername = ypxfr_get_master(yppasswd_domain,
236 _passwd_byname, _localhost, 0)) == NULL) {
237 yp_error("can't get name of NIS master server for domain %s",
238 yppasswd_domain);
239 exit(1);
240 }
241
242 if (gethostname((char *)&myname, sizeof(myname)) == -1) {
243 yp_error("can't get local hostname: %s", strerror(errno));
244 exit(1);
245 }
246
247 if (strncasecmp(mastername, (char *)&myname, sizeof(myname))) {
248 yp_error("master of %s is %s, but we are %s",
249 "passwd.byname", mastername, myname);
250 yp_error("this host is not the NIS master server for \
251 the %s domain -- aborting", yppasswd_domain);
252 exit(1);
253 }
254
255 debug = 0;
256
257 if (getsockname(0, (struct sockaddr *)&saddr, &asize) == 0) {
258 socklen_t ssize = sizeof (int);
259 if (saddr.sin_family != AF_INET)
260 exit(1);
261 if (getsockopt(0, SOL_SOCKET, SO_TYPE,
262 (char *)&_rpcfdtype, &ssize) == -1)
263 exit(1);
264 _rpcpmstart = 1;
265 }
266
267 if (!debug && _rpcpmstart == 0) {
268 if (daemon(0,0)) {
269 err(1,"cannot fork");
270 }
271 }
272 openlog("rpc.yppasswdd", LOG_PID, LOG_DAEMON);
273 memset(&sa, 0, sizeof(sa));
274 sa.sa_flags = SA_NOCLDWAIT;
275 sigaction(SIGCHLD, &sa, NULL);
276
277 rpcb_unset(YPPASSWDPROG, YPPASSWDVERS, NULL);
278 rpcb_unset(MASTER_YPPASSWDPROG, MASTER_YPPASSWDVERS, NULL);
279
280 rpc_control(RPC_SVC_CONNMAXREC_SET, &maxrec);
281
282 if (svc_create(yppasswdprog_1, YPPASSWDPROG, YPPASSWDVERS, "netpath") == 0) {
283 yp_error("cannot create yppasswd service.");
284 exit(1);
285 }
286 if (svc_create(master_yppasswdprog_1, MASTER_YPPASSWDPROG,
287 MASTER_YPPASSWDVERS, "netpath") == 0) {
288 yp_error("cannot create master_yppasswd service.");
289 exit(1);
290 }
291
292 nconf = NULL;
293 localhandle = setnetconfig();
294 while ((nconf = getnetconfig(localhandle)) != NULL) {
295 if (nconf->nc_protofmly != NULL &&
296 strcmp(nconf->nc_protofmly, NC_LOOPBACK) == 0)
297 break;
298 }
299 if (nconf == NULL) {
300 yp_error("getnetconfigent unix: %s", nc_sperror());
301 exit(1);
302 }
303 unlink(sockname);
304 transp = svcunix_create(RPC_ANYSOCK, 0, 0, sockname);
305 if (transp == NULL) {
306 yp_error("cannot create AF_LOCAL service.");
307 exit(1);
308 }
309 if (!svc_reg(transp, MASTER_YPPASSWDPROG, MASTER_YPPASSWDVERS,
310 master_yppasswdprog_1, nconf)) {
311 yp_error("unable to register (MASTER_YPPASSWDPROG, \
312 MASTER_YPPASSWDVERS, unix).");
313 exit(1);
314 }
315 endnetconfig(localhandle);
316
317 /* Only root may connect() to the AF_UNIX link. */
318 if (chmod(sockname, 0))
319 err(1, "chmod of %s failed", sockname);
320
321 if (transp == (SVCXPRT *)NULL) {
322 yp_error("could not create a handle");
323 exit(1);
324 }
325 if (_rpcpmstart) {
326 (void) signal(SIGALRM, (SIG_PF) closedown);
327 (void) alarm(_RPCSVC_CLOSEDOWN/2);
328 }
329
330 /* Unlimited resource limits. */
331 rlim.rlim_cur = rlim.rlim_max = RLIM_INFINITY;
332 (void)setrlimit(RLIMIT_CPU, &rlim);
333 (void)setrlimit(RLIMIT_FSIZE, &rlim);
334 (void)setrlimit(RLIMIT_STACK, &rlim);
335 (void)setrlimit(RLIMIT_DATA, &rlim);
336 (void)setrlimit(RLIMIT_RSS, &rlim);
337
338 /* Don't drop core (not really necessary, but GP's). */
339 rlim.rlim_cur = rlim.rlim_max = 0;
340 (void)setrlimit(RLIMIT_CORE, &rlim);
341
342 /* Turn off signals. */
343 (void)signal(SIGALRM, SIG_IGN);
344 (void)signal(SIGHUP, (SIG_PF) reload);
345 (void)signal(SIGINT, SIG_IGN);
346 (void)signal(SIGPIPE, SIG_IGN);
347 (void)signal(SIGQUIT, SIG_IGN);
348 (void)signal(SIGTERM, (SIG_PF) terminate);
349
350 svc_run();
351 yp_error("svc_run returned");
352 exit(1);
353 /* NOTREACHED */
354 }
355