1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1983, 1991, 1993, 1994
5 * The Regents of the University of California. 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. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #ifndef lint
33 static const char copyright[] =
34 "@(#) Copyright (c) 1983, 1991, 1993, 1994\n\
35 The Regents of the University of California. All rights reserved.\n";
36 #endif /* not lint */
37
38 #ifndef lint
39 #if 0
40 static char sccsid[] = "@(#)from: inetd.c 8.4 (Berkeley) 4/13/94";
41 #endif
42 #endif /* not lint */
43
44 #include <sys/cdefs.h>
45 __FBSDID("$FreeBSD$");
46
47 /*
48 * Inetd - Internet super-server
49 *
50 * This program invokes all internet services as needed. Connection-oriented
51 * services are invoked each time a connection is made, by creating a process.
52 * This process is passed the connection as file descriptor 0 and is expected
53 * to do a getpeername to find out the source host and port.
54 *
55 * Datagram oriented services are invoked when a datagram
56 * arrives; a process is created and passed a pending message
57 * on file descriptor 0. Datagram servers may either connect
58 * to their peer, freeing up the original socket for inetd
59 * to receive further messages on, or ``take over the socket'',
60 * processing all arriving datagrams and, eventually, timing
61 * out. The first type of server is said to be ``multi-threaded'';
62 * the second type of server ``single-threaded''.
63 *
64 * Inetd uses a configuration file which is read at startup
65 * and, possibly, at some later time in response to a hangup signal.
66 * The configuration file is ``free format'' with fields given in the
67 * order shown below. Continuation lines for an entry must begin with
68 * a space or tab. All fields must be present in each entry.
69 *
70 * service name must be in /etc/services
71 * or name a tcpmux service
72 * or specify a unix domain socket
73 * socket type stream/dgram/raw/rdm/seqpacket
74 * protocol tcp[4][6], udp[4][6], unix
75 * wait/nowait single-threaded/multi-threaded
76 * user[:group][/login-class] user/group/login-class to run daemon as
77 * server program full path name
78 * server program arguments maximum of MAXARGS (20)
79 *
80 * TCP services without official port numbers are handled with the
81 * RFC1078-based tcpmux internal service. Tcpmux listens on port 1 for
82 * requests. When a connection is made from a foreign host, the service
83 * requested is passed to tcpmux, which looks it up in the servtab list
84 * and returns the proper entry for the service. Tcpmux returns a
85 * negative reply if the service doesn't exist, otherwise the invoked
86 * server is expected to return the positive reply if the service type in
87 * inetd.conf file has the prefix "tcpmux/". If the service type has the
88 * prefix "tcpmux/+", tcpmux will return the positive reply for the
89 * process; this is for compatibility with older server code, and also
90 * allows you to invoke programs that use stdin/stdout without putting any
91 * special server code in them. Services that use tcpmux are "nowait"
92 * because they do not have a well-known port and hence cannot listen
93 * for new requests.
94 *
95 * For RPC services
96 * service name/version must be in /etc/rpc
97 * socket type stream/dgram/raw/rdm/seqpacket
98 * protocol rpc/tcp[4][6], rpc/udp[4][6]
99 * wait/nowait single-threaded/multi-threaded
100 * user[:group][/login-class] user/group/login-class to run daemon as
101 * server program full path name
102 * server program arguments maximum of MAXARGS
103 *
104 * Comment lines are indicated by a `#' in column 1.
105 *
106 * #ifdef IPSEC
107 * Comment lines that start with "#@" denote IPsec policy string, as described
108 * in ipsec_set_policy(3). This will affect all the following items in
109 * inetd.conf(8). To reset the policy, just use "#@" line. By default,
110 * there's no IPsec policy.
111 * #endif
112 */
113 #include <sys/param.h>
114 #include <sys/ioctl.h>
115 #include <sys/mman.h>
116 #include <sys/wait.h>
117 #include <sys/time.h>
118 #include <sys/resource.h>
119 #include <sys/stat.h>
120 #include <sys/un.h>
121
122 #include <netinet/in.h>
123 #include <netinet/tcp.h>
124 #include <arpa/inet.h>
125 #include <rpc/rpc.h>
126 #include <rpc/pmap_clnt.h>
127
128 #include <ctype.h>
129 #include <errno.h>
130 #include <err.h>
131 #include <fcntl.h>
132 #include <grp.h>
133 #include <libutil.h>
134 #include <limits.h>
135 #include <netdb.h>
136 #include <pwd.h>
137 #include <signal.h>
138 #include <stdio.h>
139 #include <stdlib.h>
140 #include <string.h>
141 #include <sysexits.h>
142 #include <syslog.h>
143 #ifdef LIBWRAP
144 #include <tcpd.h>
145 #endif
146 #include <unistd.h>
147
148 #include "inetd.h"
149 #include "pathnames.h"
150
151 #ifdef IPSEC
152 #include <netipsec/ipsec.h>
153 #ifndef IPSEC_POLICY_IPSEC /* no ipsec support on old ipsec */
154 #undef IPSEC
155 #endif
156 #endif
157
158 #ifndef LIBWRAP_ALLOW_FACILITY
159 # define LIBWRAP_ALLOW_FACILITY LOG_AUTH
160 #endif
161 #ifndef LIBWRAP_ALLOW_SEVERITY
162 # define LIBWRAP_ALLOW_SEVERITY LOG_INFO
163 #endif
164 #ifndef LIBWRAP_DENY_FACILITY
165 # define LIBWRAP_DENY_FACILITY LOG_AUTH
166 #endif
167 #ifndef LIBWRAP_DENY_SEVERITY
168 # define LIBWRAP_DENY_SEVERITY LOG_WARNING
169 #endif
170
171 #define ISWRAP(sep) \
172 ( ((wrap_ex && !(sep)->se_bi) || (wrap_bi && (sep)->se_bi)) \
173 && (sep->se_family == AF_INET || sep->se_family == AF_INET6) \
174 && ( ((sep)->se_accept && (sep)->se_socktype == SOCK_STREAM) \
175 || (sep)->se_socktype == SOCK_DGRAM))
176
177 #ifdef LOGIN_CAP
178 #include <login_cap.h>
179
180 /* see init.c */
181 #define RESOURCE_RC "daemon"
182
183 #endif
184
185 #ifndef MAXCHILD
186 #define MAXCHILD -1 /* maximum number of this service
187 < 0 = no limit */
188 #endif
189
190 #ifndef MAXCPM
191 #define MAXCPM -1 /* rate limit invocations from a
192 single remote address,
193 < 0 = no limit */
194 #endif
195
196 #ifndef MAXPERIP
197 #define MAXPERIP -1 /* maximum number of this service
198 from a single remote address,
199 < 0 = no limit */
200 #endif
201
202 #ifndef TOOMANY
203 #define TOOMANY 256 /* don't start more than TOOMANY */
204 #endif
205 #define CNT_INTVL 60 /* servers in CNT_INTVL sec. */
206 #define RETRYTIME (60*10) /* retry after bind or server fail */
207 #define MAX_MAXCHLD 32767 /* max allowable max children */
208
209 #define SIGBLOCK (sigmask(SIGCHLD)|sigmask(SIGHUP)|sigmask(SIGALRM))
210
211 #define satosin(sa) ((struct sockaddr_in *)(void *)sa)
212 #define csatosin(sa) ((const struct sockaddr_in *)(const void *)sa)
213 #ifdef INET6
214 #define satosin6(sa) ((struct sockaddr_in6 *)(void *)sa)
215 #define csatosin6(sa) ((const struct sockaddr_in6 *)(const void *)sa)
216 #endif
217 static void close_sep(struct servtab *);
218 static void flag_signal(int);
219 static void config(void);
220 static int cpmip(const struct servtab *, int);
221 static void endconfig(void);
222 static struct servtab *enter(struct servtab *);
223 static void freeconfig(struct servtab *);
224 static struct servtab *getconfigent(void);
225 static int matchservent(const char *, const char *, const char *);
226 static char *nextline(FILE *);
227 static void addchild(struct servtab *, int);
228 static void reapchild(void);
229 static void enable(struct servtab *);
230 static void disable(struct servtab *);
231 static void retry(void);
232 static int setconfig(void);
233 static void setup(struct servtab *);
234 #ifdef IPSEC
235 static void ipsecsetup(struct servtab *);
236 #endif
237 static void unregisterrpc(register struct servtab *sep);
238 static struct conninfo *search_conn(struct servtab *sep, int ctrl);
239 static int room_conn(struct servtab *sep, struct conninfo *conn);
240 static void addchild_conn(struct conninfo *conn, pid_t pid);
241 static void reapchild_conn(pid_t pid);
242 static void free_conn(struct conninfo *conn);
243 static void resize_conn(struct servtab *sep, int maxperip);
244 static void free_connlist(struct servtab *sep);
245 static void free_proc(struct procinfo *);
246 static struct procinfo *search_proc(pid_t pid, int add);
247 static int hashval(char *p, int len);
248 static char *skip(char **);
249 static char *sskip(char **);
250 static char *newstr(const char *);
251 static void print_service(const char *, const struct servtab *);
252
253 /* tcpd.h */
254 int allow_severity;
255 int deny_severity;
256
257 static int wrap_ex = 0;
258 static int wrap_bi = 0;
259 int debug = 0;
260 static int dolog = 0;
261 static int maxsock; /* highest-numbered descriptor */
262 static fd_set allsock;
263 static int options;
264 static int timingout;
265 static int toomany = TOOMANY;
266 static int maxchild = MAXCHILD;
267 static int maxcpm = MAXCPM;
268 static int maxperip = MAXPERIP;
269 static struct servent *sp;
270 static struct rpcent *rpc;
271 static char *hostname = NULL;
272 static struct sockaddr_in *bind_sa4;
273 static int v4bind_ok = 0;
274 #ifdef INET6
275 static struct sockaddr_in6 *bind_sa6;
276 static int v6bind_ok = 0;
277 #endif
278 static int signalpipe[2];
279 #ifdef SANITY_CHECK
280 static int nsock;
281 #endif
282 static uid_t euid;
283 static gid_t egid;
284 static mode_t mask;
285
286 struct servtab *servtab;
287
288 static const char *CONFIG = _PATH_INETDCONF;
289 static const char *pid_file = _PATH_INETDPID;
290 static struct pidfh *pfh = NULL;
291
292 static struct netconfig *udpconf, *tcpconf, *udp6conf, *tcp6conf;
293
294 static LIST_HEAD(, procinfo) proctable[PERIPSIZE];
295
296 static int
getvalue(const char * arg,int * value,const char * whine)297 getvalue(const char *arg, int *value, const char *whine)
298 {
299 int tmp;
300 char *p;
301
302 tmp = strtol(arg, &p, 0);
303 if (tmp < 0 || *p) {
304 syslog(LOG_ERR, whine, arg);
305 return 1; /* failure */
306 }
307 *value = tmp;
308 return 0; /* success */
309 }
310
311 #ifdef LIBWRAP
312 static sa_family_t
whichaf(struct request_info * req)313 whichaf(struct request_info *req)
314 {
315 struct sockaddr *sa;
316
317 sa = (struct sockaddr *)req->client->sin;
318 if (sa == NULL)
319 return AF_UNSPEC;
320 #ifdef INET6
321 if (sa->sa_family == AF_INET6 &&
322 IN6_IS_ADDR_V4MAPPED(&satosin6(sa)->sin6_addr))
323 return AF_INET;
324 #endif
325 return sa->sa_family;
326 }
327 #endif
328
329 int
main(int argc,char ** argv)330 main(int argc, char **argv)
331 {
332 struct servtab *sep;
333 struct passwd *pwd;
334 struct group *grp;
335 struct sigaction sa, saalrm, sachld, sahup, sapipe;
336 int ch, dofork;
337 pid_t pid;
338 char buf[50];
339 #ifdef LOGIN_CAP
340 login_cap_t *lc = NULL;
341 #endif
342 #ifdef LIBWRAP
343 struct request_info req;
344 int denied;
345 char *service = NULL;
346 #endif
347 struct sockaddr_storage peer;
348 int i;
349 struct addrinfo hints, *res;
350 const char *servname;
351 int error;
352 struct conninfo *conn;
353
354 openlog("inetd", LOG_PID | LOG_NOWAIT | LOG_PERROR, LOG_DAEMON);
355
356 while ((ch = getopt(argc, argv, "dlwWR:a:c:C:p:s:")) != -1)
357 switch(ch) {
358 case 'd':
359 debug = 1;
360 options |= SO_DEBUG;
361 break;
362 case 'l':
363 dolog = 1;
364 break;
365 case 'R':
366 getvalue(optarg, &toomany,
367 "-R %s: bad value for service invocation rate");
368 break;
369 case 'c':
370 getvalue(optarg, &maxchild,
371 "-c %s: bad value for maximum children");
372 break;
373 case 'C':
374 getvalue(optarg, &maxcpm,
375 "-C %s: bad value for maximum children/minute");
376 break;
377 case 'a':
378 hostname = optarg;
379 break;
380 case 'p':
381 pid_file = optarg;
382 break;
383 case 's':
384 getvalue(optarg, &maxperip,
385 "-s %s: bad value for maximum children per source address");
386 break;
387 case 'w':
388 wrap_ex++;
389 break;
390 case 'W':
391 wrap_bi++;
392 break;
393 case '?':
394 default:
395 syslog(LOG_ERR,
396 "usage: inetd [-dlwW] [-a address] [-R rate]"
397 " [-c maximum] [-C rate]"
398 " [-p pidfile] [conf-file]");
399 exit(EX_USAGE);
400 }
401 /*
402 * Initialize Bind Addrs.
403 * When hostname is NULL, wild card bind addrs are obtained from
404 * getaddrinfo(). But getaddrinfo() requires at least one of
405 * hostname or servname is non NULL.
406 * So when hostname is NULL, set dummy value to servname.
407 * Since getaddrinfo() doesn't accept numeric servname, and
408 * we doesn't use ai_socktype of struct addrinfo returned
409 * from getaddrinfo(), we set dummy value to ai_socktype.
410 */
411 servname = (hostname == NULL) ? "0" /* dummy */ : NULL;
412
413 bzero(&hints, sizeof(struct addrinfo));
414 hints.ai_flags = AI_PASSIVE;
415 hints.ai_family = AF_UNSPEC;
416 hints.ai_socktype = SOCK_STREAM; /* dummy */
417 error = getaddrinfo(hostname, servname, &hints, &res);
418 if (error != 0) {
419 syslog(LOG_ERR, "-a %s: %s", hostname, gai_strerror(error));
420 if (error == EAI_SYSTEM)
421 syslog(LOG_ERR, "%s", strerror(errno));
422 exit(EX_USAGE);
423 }
424 do {
425 if (res->ai_addr == NULL) {
426 syslog(LOG_ERR, "-a %s: getaddrinfo failed", hostname);
427 exit(EX_USAGE);
428 }
429 switch (res->ai_addr->sa_family) {
430 case AF_INET:
431 if (v4bind_ok)
432 continue;
433 bind_sa4 = satosin(res->ai_addr);
434 /* init port num in case servname is dummy */
435 bind_sa4->sin_port = 0;
436 v4bind_ok = 1;
437 continue;
438 #ifdef INET6
439 case AF_INET6:
440 if (v6bind_ok)
441 continue;
442 bind_sa6 = satosin6(res->ai_addr);
443 /* init port num in case servname is dummy */
444 bind_sa6->sin6_port = 0;
445 v6bind_ok = 1;
446 continue;
447 #endif
448 }
449 if (v4bind_ok
450 #ifdef INET6
451 && v6bind_ok
452 #endif
453 )
454 break;
455 } while ((res = res->ai_next) != NULL);
456 if (!v4bind_ok
457 #ifdef INET6
458 && !v6bind_ok
459 #endif
460 ) {
461 syslog(LOG_ERR, "-a %s: unknown address family", hostname);
462 exit(EX_USAGE);
463 }
464
465 euid = geteuid();
466 egid = getegid();
467 umask(mask = umask(0777));
468
469 argc -= optind;
470 argv += optind;
471
472 if (argc > 0)
473 CONFIG = argv[0];
474 if (access(CONFIG, R_OK) < 0)
475 syslog(LOG_ERR, "Accessing %s: %m, continuing anyway.", CONFIG);
476 if (debug == 0) {
477 pid_t otherpid;
478
479 pfh = pidfile_open(pid_file, 0600, &otherpid);
480 if (pfh == NULL) {
481 if (errno == EEXIST) {
482 syslog(LOG_ERR, "%s already running, pid: %d",
483 getprogname(), otherpid);
484 exit(EX_OSERR);
485 }
486 syslog(LOG_WARNING, "pidfile_open() failed: %m");
487 }
488
489 if (daemon(0, 0) < 0) {
490 syslog(LOG_WARNING, "daemon(0,0) failed: %m");
491 }
492 /* From now on we don't want syslog messages going to stderr. */
493 closelog();
494 openlog("inetd", LOG_PID | LOG_NOWAIT, LOG_DAEMON);
495 /*
496 * In case somebody has started inetd manually, we need to
497 * clear the logname, so that old servers run as root do not
498 * get the user's logname..
499 */
500 if (setlogin("") < 0) {
501 syslog(LOG_WARNING, "cannot clear logname: %m");
502 /* no big deal if it fails.. */
503 }
504 if (pfh != NULL && pidfile_write(pfh) == -1) {
505 syslog(LOG_WARNING, "pidfile_write(): %m");
506 }
507 }
508
509 if (madvise(NULL, 0, MADV_PROTECT) != 0)
510 syslog(LOG_WARNING, "madvise() failed: %s", strerror(errno));
511
512 for (i = 0; i < PERIPSIZE; ++i)
513 LIST_INIT(&proctable[i]);
514
515 if (v4bind_ok) {
516 udpconf = getnetconfigent("udp");
517 tcpconf = getnetconfigent("tcp");
518 if (udpconf == NULL || tcpconf == NULL) {
519 syslog(LOG_ERR, "unknown rpc/udp or rpc/tcp");
520 exit(EX_USAGE);
521 }
522 }
523 #ifdef INET6
524 if (v6bind_ok) {
525 udp6conf = getnetconfigent("udp6");
526 tcp6conf = getnetconfigent("tcp6");
527 if (udp6conf == NULL || tcp6conf == NULL) {
528 syslog(LOG_ERR, "unknown rpc/udp6 or rpc/tcp6");
529 exit(EX_USAGE);
530 }
531 }
532 #endif
533
534 sa = (struct sigaction){
535 .sa_flags = 0,
536 .sa_handler = flag_signal,
537 };
538 sigemptyset(&sa.sa_mask);
539 sigaddset(&sa.sa_mask, SIGALRM);
540 sigaddset(&sa.sa_mask, SIGCHLD);
541 sigaddset(&sa.sa_mask, SIGHUP);
542 sigaction(SIGALRM, &sa, &saalrm);
543 config();
544 sigaction(SIGHUP, &sa, &sahup);
545 sigaction(SIGCHLD, &sa, &sachld);
546 sa.sa_handler = SIG_IGN;
547 sigaction(SIGPIPE, &sa, &sapipe);
548
549 {
550 /* space for daemons to overwrite environment for ps */
551 #define DUMMYSIZE 100
552 char dummy[DUMMYSIZE];
553
554 (void)memset(dummy, 'x', DUMMYSIZE - 1);
555 dummy[DUMMYSIZE - 1] = '\0';
556 (void)setenv("inetd_dummy", dummy, 1);
557 }
558
559 if (pipe2(signalpipe, O_CLOEXEC) != 0) {
560 syslog(LOG_ERR, "pipe: %m");
561 exit(EX_OSERR);
562 }
563 FD_SET(signalpipe[0], &allsock);
564 #ifdef SANITY_CHECK
565 nsock++;
566 #endif
567 if (signalpipe[0] > maxsock)
568 maxsock = signalpipe[0];
569 if (signalpipe[1] > maxsock)
570 maxsock = signalpipe[1];
571
572 for (;;) {
573 int n, ctrl;
574 fd_set readable;
575
576 #ifdef SANITY_CHECK
577 if (nsock == 0) {
578 syslog(LOG_ERR, "%s: nsock=0", __func__);
579 exit(EX_SOFTWARE);
580 }
581 #endif
582 readable = allsock;
583 if ((n = select(maxsock + 1, &readable, (fd_set *)0,
584 (fd_set *)0, (struct timeval *)0)) <= 0) {
585 if (n < 0 && errno != EINTR) {
586 syslog(LOG_WARNING, "select: %m");
587 sleep(1);
588 }
589 continue;
590 }
591 /* handle any queued signal flags */
592 if (FD_ISSET(signalpipe[0], &readable)) {
593 int nsig, signo;
594
595 if (ioctl(signalpipe[0], FIONREAD, &nsig) != 0) {
596 syslog(LOG_ERR, "ioctl: %m");
597 exit(EX_OSERR);
598 }
599 nsig /= sizeof(signo);
600 while (--nsig >= 0) {
601 size_t len;
602
603 len = read(signalpipe[0], &signo, sizeof(signo));
604 if (len != sizeof(signo)) {
605 syslog(LOG_ERR, "read: %m");
606 exit(EX_OSERR);
607 }
608 if (debug)
609 warnx("handling signal flag %d", signo);
610 switch (signo) {
611 case SIGALRM:
612 retry();
613 break;
614 case SIGCHLD:
615 reapchild();
616 break;
617 case SIGHUP:
618 config();
619 break;
620 }
621 }
622 }
623 for (sep = servtab; n && sep; sep = sep->se_next)
624 if (sep->se_fd != -1 && FD_ISSET(sep->se_fd, &readable)) {
625 n--;
626 if (debug)
627 warnx("someone wants %s", sep->se_service);
628 dofork = !sep->se_bi || sep->se_bi->bi_fork || ISWRAP(sep);
629 conn = NULL;
630 if (sep->se_accept && sep->se_socktype == SOCK_STREAM) {
631 i = 1;
632 if (ioctl(sep->se_fd, FIONBIO, &i) < 0)
633 syslog(LOG_ERR, "ioctl (FIONBIO, 1): %m");
634 ctrl = accept(sep->se_fd, (struct sockaddr *)0,
635 (socklen_t *)0);
636 if (debug)
637 warnx("accept, ctrl %d", ctrl);
638 if (ctrl < 0) {
639 if (errno != EINTR)
640 syslog(LOG_WARNING,
641 "accept (for %s): %m",
642 sep->se_service);
643 if (sep->se_accept &&
644 sep->se_socktype == SOCK_STREAM)
645 close(ctrl);
646 continue;
647 }
648 i = 0;
649 if (ioctl(sep->se_fd, FIONBIO, &i) < 0)
650 syslog(LOG_ERR, "ioctl1(FIONBIO, 0): %m");
651 if (ioctl(ctrl, FIONBIO, &i) < 0)
652 syslog(LOG_ERR, "ioctl2(FIONBIO, 0): %m");
653 if (cpmip(sep, ctrl) < 0) {
654 close(ctrl);
655 continue;
656 }
657 if (dofork &&
658 (conn = search_conn(sep, ctrl)) != NULL &&
659 !room_conn(sep, conn)) {
660 close(ctrl);
661 continue;
662 }
663 } else
664 ctrl = sep->se_fd;
665 if (dolog && !ISWRAP(sep)) {
666 char pname[NI_MAXHOST] = "unknown";
667 socklen_t sl;
668 sl = sizeof(peer);
669 if (getpeername(ctrl, (struct sockaddr *)
670 &peer, &sl)) {
671 sl = sizeof(peer);
672 if (recvfrom(ctrl, buf, sizeof(buf),
673 MSG_PEEK,
674 (struct sockaddr *)&peer,
675 &sl) >= 0) {
676 getnameinfo((struct sockaddr *)&peer,
677 peer.ss_len,
678 pname, sizeof(pname),
679 NULL, 0, NI_NUMERICHOST);
680 }
681 } else {
682 getnameinfo((struct sockaddr *)&peer,
683 peer.ss_len,
684 pname, sizeof(pname),
685 NULL, 0, NI_NUMERICHOST);
686 }
687 syslog(LOG_INFO,"%s from %s", sep->se_service, pname);
688 }
689 (void) sigblock(SIGBLOCK);
690 pid = 0;
691 /*
692 * Fork for all external services, builtins which need to
693 * fork and anything we're wrapping (as wrapping might
694 * block or use hosts_options(5) twist).
695 */
696 if (dofork) {
697 if (sep->se_count++ == 0)
698 (void)clock_gettime(CLOCK_MONOTONIC_FAST, &sep->se_time);
699 else if (toomany > 0 && sep->se_count >= toomany) {
700 struct timespec now;
701
702 (void)clock_gettime(CLOCK_MONOTONIC_FAST, &now);
703 if (now.tv_sec - sep->se_time.tv_sec >
704 CNT_INTVL) {
705 sep->se_time = now;
706 sep->se_count = 1;
707 } else {
708 syslog(LOG_ERR,
709 "%s/%s server failing (looping), service terminated",
710 sep->se_service, sep->se_proto);
711 if (sep->se_accept &&
712 sep->se_socktype == SOCK_STREAM)
713 close(ctrl);
714 close_sep(sep);
715 free_conn(conn);
716 sigsetmask(0L);
717 if (!timingout) {
718 timingout = 1;
719 alarm(RETRYTIME);
720 }
721 continue;
722 }
723 }
724 pid = fork();
725 }
726 if (pid < 0) {
727 syslog(LOG_ERR, "fork: %m");
728 if (sep->se_accept &&
729 sep->se_socktype == SOCK_STREAM)
730 close(ctrl);
731 free_conn(conn);
732 sigsetmask(0L);
733 sleep(1);
734 continue;
735 }
736 if (pid) {
737 addchild_conn(conn, pid);
738 addchild(sep, pid);
739 }
740 sigsetmask(0L);
741 if (pid == 0) {
742 pidfile_close(pfh);
743 if (dofork) {
744 sigaction(SIGALRM, &saalrm, (struct sigaction *)0);
745 sigaction(SIGCHLD, &sachld, (struct sigaction *)0);
746 sigaction(SIGHUP, &sahup, (struct sigaction *)0);
747 /* SIGPIPE reset before exec */
748 }
749 /*
750 * Call tcpmux to find the real service to exec.
751 */
752 if (sep->se_bi &&
753 sep->se_bi->bi_fn == (bi_fn_t *) tcpmux) {
754 sep = tcpmux(ctrl);
755 if (sep == NULL) {
756 close(ctrl);
757 _exit(0);
758 }
759 }
760 #ifdef LIBWRAP
761 if (ISWRAP(sep)) {
762 inetd_setproctitle("wrapping", ctrl);
763 service = sep->se_server_name ?
764 sep->se_server_name : sep->se_service;
765 request_init(&req, RQ_DAEMON, service, RQ_FILE, ctrl, 0);
766 fromhost(&req);
767 deny_severity = LIBWRAP_DENY_FACILITY|LIBWRAP_DENY_SEVERITY;
768 allow_severity = LIBWRAP_ALLOW_FACILITY|LIBWRAP_ALLOW_SEVERITY;
769 denied = !hosts_access(&req);
770 if (denied) {
771 syslog(deny_severity,
772 "refused connection from %.500s, service %s (%s%s)",
773 eval_client(&req), service, sep->se_proto,
774 (whichaf(&req) == AF_INET6) ? "6" : "");
775 if (sep->se_socktype != SOCK_STREAM)
776 recv(ctrl, buf, sizeof (buf), 0);
777 if (dofork) {
778 sleep(1);
779 _exit(0);
780 }
781 }
782 if (dolog) {
783 syslog(allow_severity,
784 "connection from %.500s, service %s (%s%s)",
785 eval_client(&req), service, sep->se_proto,
786 (whichaf(&req) == AF_INET6) ? "6" : "");
787 }
788 }
789 #endif
790 if (sep->se_bi) {
791 (*sep->se_bi->bi_fn)(ctrl, sep);
792 } else {
793 if (debug)
794 warnx("%d execl %s",
795 getpid(), sep->se_server);
796 /* Clear close-on-exec. */
797 if (fcntl(ctrl, F_SETFD, 0) < 0) {
798 syslog(LOG_ERR,
799 "%s/%s: fcntl (F_SETFD, 0): %m",
800 sep->se_service, sep->se_proto);
801 _exit(EX_OSERR);
802 }
803 if (ctrl != 0) {
804 dup2(ctrl, 0);
805 close(ctrl);
806 }
807 dup2(0, 1);
808 dup2(0, 2);
809 if ((pwd = getpwnam(sep->se_user)) == NULL) {
810 syslog(LOG_ERR,
811 "%s/%s: %s: no such user",
812 sep->se_service, sep->se_proto,
813 sep->se_user);
814 if (sep->se_socktype != SOCK_STREAM)
815 recv(0, buf, sizeof (buf), 0);
816 _exit(EX_NOUSER);
817 }
818 grp = NULL;
819 if ( sep->se_group != NULL
820 && (grp = getgrnam(sep->se_group)) == NULL
821 ) {
822 syslog(LOG_ERR,
823 "%s/%s: %s: no such group",
824 sep->se_service, sep->se_proto,
825 sep->se_group);
826 if (sep->se_socktype != SOCK_STREAM)
827 recv(0, buf, sizeof (buf), 0);
828 _exit(EX_NOUSER);
829 }
830 if (grp != NULL)
831 pwd->pw_gid = grp->gr_gid;
832 #ifdef LOGIN_CAP
833 if ((lc = login_getclass(sep->se_class)) == NULL) {
834 /* error syslogged by getclass */
835 syslog(LOG_ERR,
836 "%s/%s: %s: login class error",
837 sep->se_service, sep->se_proto,
838 sep->se_class);
839 if (sep->se_socktype != SOCK_STREAM)
840 recv(0, buf, sizeof (buf), 0);
841 _exit(EX_NOUSER);
842 }
843 #endif
844 if (setsid() < 0) {
845 syslog(LOG_ERR,
846 "%s: can't setsid(): %m",
847 sep->se_service);
848 /* _exit(EX_OSERR); not fatal yet */
849 }
850 #ifdef LOGIN_CAP
851 if (setusercontext(lc, pwd, pwd->pw_uid,
852 LOGIN_SETALL & ~LOGIN_SETMAC)
853 != 0) {
854 syslog(LOG_ERR,
855 "%s: can't setusercontext(..%s..): %m",
856 sep->se_service, sep->se_user);
857 _exit(EX_OSERR);
858 }
859 login_close(lc);
860 #else
861 if (pwd->pw_uid) {
862 if (setlogin(sep->se_user) < 0) {
863 syslog(LOG_ERR,
864 "%s: can't setlogin(%s): %m",
865 sep->se_service, sep->se_user);
866 /* _exit(EX_OSERR); not yet */
867 }
868 if (setgid(pwd->pw_gid) < 0) {
869 syslog(LOG_ERR,
870 "%s: can't set gid %d: %m",
871 sep->se_service, pwd->pw_gid);
872 _exit(EX_OSERR);
873 }
874 (void) initgroups(pwd->pw_name,
875 pwd->pw_gid);
876 if (setuid(pwd->pw_uid) < 0) {
877 syslog(LOG_ERR,
878 "%s: can't set uid %d: %m",
879 sep->se_service, pwd->pw_uid);
880 _exit(EX_OSERR);
881 }
882 }
883 #endif
884 sigaction(SIGPIPE, &sapipe,
885 (struct sigaction *)0);
886 execv(sep->se_server, sep->se_argv);
887 syslog(LOG_ERR,
888 "cannot execute %s: %m", sep->se_server);
889 if (sep->se_socktype != SOCK_STREAM)
890 recv(0, buf, sizeof (buf), 0);
891 }
892 if (dofork)
893 _exit(0);
894 }
895 if (sep->se_accept && sep->se_socktype == SOCK_STREAM)
896 close(ctrl);
897 }
898 }
899 }
900
901 /*
902 * Add a signal flag to the signal flag queue for later handling
903 */
904
905 static void
flag_signal(int signo)906 flag_signal(int signo)
907 {
908 size_t len;
909
910 len = write(signalpipe[1], &signo, sizeof(signo));
911 if (len != sizeof(signo)) {
912 syslog(LOG_ERR, "write: %m");
913 _exit(EX_OSERR);
914 }
915 }
916
917 /*
918 * Record a new child pid for this service. If we've reached the
919 * limit on children, then stop accepting incoming requests.
920 */
921
922 static void
addchild(struct servtab * sep,pid_t pid)923 addchild(struct servtab *sep, pid_t pid)
924 {
925 if (sep->se_maxchild <= 0)
926 return;
927 #ifdef SANITY_CHECK
928 if (sep->se_numchild >= sep->se_maxchild) {
929 syslog(LOG_ERR, "%s: %d >= %d",
930 __func__, sep->se_numchild, sep->se_maxchild);
931 exit(EX_SOFTWARE);
932 }
933 #endif
934 sep->se_pids[sep->se_numchild++] = pid;
935 if (sep->se_numchild == sep->se_maxchild)
936 disable(sep);
937 }
938
939 static void
reapchild(void)940 reapchild(void)
941 {
942 int k, status;
943 pid_t pid;
944 struct servtab *sep;
945
946 for (;;) {
947 pid = wait3(&status, WNOHANG, (struct rusage *)0);
948 if (pid <= 0)
949 break;
950 if (debug)
951 warnx("%d reaped, %s %u", pid,
952 WIFEXITED(status) ? "status" : "signal",
953 WIFEXITED(status) ? WEXITSTATUS(status)
954 : WTERMSIG(status));
955 for (sep = servtab; sep; sep = sep->se_next) {
956 for (k = 0; k < sep->se_numchild; k++)
957 if (sep->se_pids[k] == pid)
958 break;
959 if (k == sep->se_numchild)
960 continue;
961 if (sep->se_numchild == sep->se_maxchild)
962 enable(sep);
963 sep->se_pids[k] = sep->se_pids[--sep->se_numchild];
964 if (WIFSIGNALED(status) || WEXITSTATUS(status))
965 syslog(LOG_WARNING,
966 "%s[%d]: exited, %s %u",
967 sep->se_server, pid,
968 WIFEXITED(status) ? "status" : "signal",
969 WIFEXITED(status) ? WEXITSTATUS(status)
970 : WTERMSIG(status));
971 break;
972 }
973 reapchild_conn(pid);
974 }
975 }
976
977 static void
config(void)978 config(void)
979 {
980 struct servtab *sep, *new, **sepp;
981 long omask;
982 int new_nomapped;
983 #ifdef LOGIN_CAP
984 login_cap_t *lc = NULL;
985 #endif
986
987 if (!setconfig()) {
988 syslog(LOG_ERR, "%s: %m", CONFIG);
989 return;
990 }
991 for (sep = servtab; sep; sep = sep->se_next)
992 sep->se_checked = 0;
993 while ((new = getconfigent())) {
994 if (getpwnam(new->se_user) == NULL) {
995 syslog(LOG_ERR,
996 "%s/%s: no such user '%s', service ignored",
997 new->se_service, new->se_proto, new->se_user);
998 continue;
999 }
1000 if (new->se_group && getgrnam(new->se_group) == NULL) {
1001 syslog(LOG_ERR,
1002 "%s/%s: no such group '%s', service ignored",
1003 new->se_service, new->se_proto, new->se_group);
1004 continue;
1005 }
1006 #ifdef LOGIN_CAP
1007 if ((lc = login_getclass(new->se_class)) == NULL) {
1008 /* error syslogged by getclass */
1009 syslog(LOG_ERR,
1010 "%s/%s: %s: login class error, service ignored",
1011 new->se_service, new->se_proto, new->se_class);
1012 continue;
1013 }
1014 login_close(lc);
1015 #endif
1016 new_nomapped = new->se_nomapped;
1017 for (sep = servtab; sep; sep = sep->se_next)
1018 if (strcmp(sep->se_service, new->se_service) == 0 &&
1019 strcmp(sep->se_proto, new->se_proto) == 0 &&
1020 sep->se_rpc == new->se_rpc &&
1021 sep->se_socktype == new->se_socktype &&
1022 sep->se_family == new->se_family)
1023 break;
1024 if (sep != 0) {
1025 int i;
1026
1027 #define SWAP(t,a, b) { t c = a; a = b; b = c; }
1028 omask = sigblock(SIGBLOCK);
1029 if (sep->se_nomapped != new->se_nomapped) {
1030 /* for rpc keep old nommaped till unregister */
1031 if (!sep->se_rpc)
1032 sep->se_nomapped = new->se_nomapped;
1033 sep->se_reset = 1;
1034 }
1035 /* copy over outstanding child pids */
1036 if (sep->se_maxchild > 0 && new->se_maxchild > 0) {
1037 new->se_numchild = sep->se_numchild;
1038 if (new->se_numchild > new->se_maxchild)
1039 new->se_numchild = new->se_maxchild;
1040 memcpy(new->se_pids, sep->se_pids,
1041 new->se_numchild * sizeof(*new->se_pids));
1042 }
1043 SWAP(pid_t *, sep->se_pids, new->se_pids);
1044 sep->se_maxchild = new->se_maxchild;
1045 sep->se_numchild = new->se_numchild;
1046 sep->se_maxcpm = new->se_maxcpm;
1047 resize_conn(sep, new->se_maxperip);
1048 sep->se_maxperip = new->se_maxperip;
1049 sep->se_bi = new->se_bi;
1050 /* might need to turn on or off service now */
1051 if (sep->se_fd >= 0) {
1052 if (sep->se_maxchild > 0
1053 && sep->se_numchild == sep->se_maxchild) {
1054 if (FD_ISSET(sep->se_fd, &allsock))
1055 disable(sep);
1056 } else {
1057 if (!FD_ISSET(sep->se_fd, &allsock))
1058 enable(sep);
1059 }
1060 }
1061 sep->se_accept = new->se_accept;
1062 SWAP(char *, sep->se_user, new->se_user);
1063 SWAP(char *, sep->se_group, new->se_group);
1064 #ifdef LOGIN_CAP
1065 SWAP(char *, sep->se_class, new->se_class);
1066 #endif
1067 SWAP(char *, sep->se_server, new->se_server);
1068 SWAP(char *, sep->se_server_name, new->se_server_name);
1069 for (i = 0; i < MAXARGV; i++)
1070 SWAP(char *, sep->se_argv[i], new->se_argv[i]);
1071 #ifdef IPSEC
1072 SWAP(char *, sep->se_policy, new->se_policy);
1073 ipsecsetup(sep);
1074 #endif
1075 sigsetmask(omask);
1076 freeconfig(new);
1077 if (debug)
1078 print_service("REDO", sep);
1079 } else {
1080 sep = enter(new);
1081 if (debug)
1082 print_service("ADD ", sep);
1083 }
1084 sep->se_checked = 1;
1085 if (ISMUX(sep)) {
1086 sep->se_fd = -1;
1087 continue;
1088 }
1089 switch (sep->se_family) {
1090 case AF_INET:
1091 if (!v4bind_ok) {
1092 sep->se_fd = -1;
1093 continue;
1094 }
1095 break;
1096 #ifdef INET6
1097 case AF_INET6:
1098 if (!v6bind_ok) {
1099 sep->se_fd = -1;
1100 continue;
1101 }
1102 break;
1103 #endif
1104 }
1105 if (!sep->se_rpc) {
1106 if (sep->se_family != AF_UNIX) {
1107 sp = getservbyname(sep->se_service, sep->se_proto);
1108 if (sp == 0) {
1109 syslog(LOG_ERR, "%s/%s: unknown service",
1110 sep->se_service, sep->se_proto);
1111 sep->se_checked = 0;
1112 continue;
1113 }
1114 }
1115 switch (sep->se_family) {
1116 case AF_INET:
1117 if (sp->s_port != sep->se_ctrladdr4.sin_port) {
1118 sep->se_ctrladdr4.sin_port =
1119 sp->s_port;
1120 sep->se_reset = 1;
1121 }
1122 break;
1123 #ifdef INET6
1124 case AF_INET6:
1125 if (sp->s_port !=
1126 sep->se_ctrladdr6.sin6_port) {
1127 sep->se_ctrladdr6.sin6_port =
1128 sp->s_port;
1129 sep->se_reset = 1;
1130 }
1131 break;
1132 #endif
1133 }
1134 if (sep->se_reset != 0 && sep->se_fd >= 0)
1135 close_sep(sep);
1136 } else {
1137 rpc = getrpcbyname(sep->se_service);
1138 if (rpc == 0) {
1139 syslog(LOG_ERR, "%s/%s unknown RPC service",
1140 sep->se_service, sep->se_proto);
1141 if (sep->se_fd != -1)
1142 (void) close(sep->se_fd);
1143 sep->se_fd = -1;
1144 continue;
1145 }
1146 if (sep->se_reset != 0 ||
1147 rpc->r_number != sep->se_rpc_prog) {
1148 if (sep->se_rpc_prog)
1149 unregisterrpc(sep);
1150 sep->se_rpc_prog = rpc->r_number;
1151 if (sep->se_fd != -1)
1152 (void) close(sep->se_fd);
1153 sep->se_fd = -1;
1154 }
1155 sep->se_nomapped = new_nomapped;
1156 }
1157 sep->se_reset = 0;
1158 if (sep->se_fd == -1)
1159 setup(sep);
1160 }
1161 endconfig();
1162 /*
1163 * Purge anything not looked at above.
1164 */
1165 omask = sigblock(SIGBLOCK);
1166 sepp = &servtab;
1167 while ((sep = *sepp)) {
1168 if (sep->se_checked) {
1169 sepp = &sep->se_next;
1170 continue;
1171 }
1172 *sepp = sep->se_next;
1173 if (sep->se_fd >= 0)
1174 close_sep(sep);
1175 if (debug)
1176 print_service("FREE", sep);
1177 if (sep->se_rpc && sep->se_rpc_prog > 0)
1178 unregisterrpc(sep);
1179 freeconfig(sep);
1180 free(sep);
1181 }
1182 (void) sigsetmask(omask);
1183 }
1184
1185 static void
unregisterrpc(struct servtab * sep)1186 unregisterrpc(struct servtab *sep)
1187 {
1188 u_int i;
1189 struct servtab *sepp;
1190 long omask;
1191 struct netconfig *netid4, *netid6;
1192
1193 omask = sigblock(SIGBLOCK);
1194 netid4 = sep->se_socktype == SOCK_DGRAM ? udpconf : tcpconf;
1195 netid6 = sep->se_socktype == SOCK_DGRAM ? udp6conf : tcp6conf;
1196 if (sep->se_family == AF_INET)
1197 netid6 = NULL;
1198 else if (sep->se_nomapped)
1199 netid4 = NULL;
1200 /*
1201 * Conflict if same prog and protocol - In that case one should look
1202 * to versions, but it is not interesting: having separate servers for
1203 * different versions does not work well.
1204 * Therefore one do not unregister if there is a conflict.
1205 * There is also transport conflict if destroying INET when INET46
1206 * exists, or destroying INET46 when INET exists
1207 */
1208 for (sepp = servtab; sepp; sepp = sepp->se_next) {
1209 if (sepp == sep)
1210 continue;
1211 if (sepp->se_checked == 0 ||
1212 !sepp->se_rpc ||
1213 strcmp(sep->se_proto, sepp->se_proto) != 0 ||
1214 sep->se_rpc_prog != sepp->se_rpc_prog)
1215 continue;
1216 if (sepp->se_family == AF_INET)
1217 netid4 = NULL;
1218 if (sepp->se_family == AF_INET6) {
1219 netid6 = NULL;
1220 if (!sep->se_nomapped)
1221 netid4 = NULL;
1222 }
1223 if (netid4 == NULL && netid6 == NULL)
1224 return;
1225 }
1226 if (debug)
1227 print_service("UNREG", sep);
1228 for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++) {
1229 if (netid4)
1230 rpcb_unset(sep->se_rpc_prog, i, netid4);
1231 if (netid6)
1232 rpcb_unset(sep->se_rpc_prog, i, netid6);
1233 }
1234 if (sep->se_fd != -1)
1235 (void) close(sep->se_fd);
1236 sep->se_fd = -1;
1237 (void) sigsetmask(omask);
1238 }
1239
1240 static void
retry(void)1241 retry(void)
1242 {
1243 struct servtab *sep;
1244
1245 timingout = 0;
1246 for (sep = servtab; sep; sep = sep->se_next)
1247 if (sep->se_fd == -1 && !ISMUX(sep))
1248 setup(sep);
1249 }
1250
1251 static void
setup(struct servtab * sep)1252 setup(struct servtab *sep)
1253 {
1254 int on = 1;
1255
1256 /* Set all listening sockets to close-on-exec. */
1257 if ((sep->se_fd = socket(sep->se_family,
1258 sep->se_socktype | SOCK_CLOEXEC, 0)) < 0) {
1259 if (debug)
1260 warn("socket failed on %s/%s",
1261 sep->se_service, sep->se_proto);
1262 syslog(LOG_ERR, "%s/%s: socket: %m",
1263 sep->se_service, sep->se_proto);
1264 return;
1265 }
1266 #define turnon(fd, opt) \
1267 setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on))
1268 if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) &&
1269 turnon(sep->se_fd, SO_DEBUG) < 0)
1270 syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m");
1271 if (turnon(sep->se_fd, SO_REUSEADDR) < 0)
1272 syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m");
1273 #ifdef SO_PRIVSTATE
1274 if (turnon(sep->se_fd, SO_PRIVSTATE) < 0)
1275 syslog(LOG_ERR, "setsockopt (SO_PRIVSTATE): %m");
1276 #endif
1277 /* tftpd opens a new connection then needs more infos */
1278 #ifdef INET6
1279 if ((sep->se_family == AF_INET6) &&
1280 (strcmp(sep->se_proto, "udp") == 0) &&
1281 (sep->se_accept == 0) &&
1282 (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_RECVPKTINFO,
1283 (char *)&on, sizeof (on)) < 0))
1284 syslog(LOG_ERR, "setsockopt (IPV6_RECVPKTINFO): %m");
1285 if (sep->se_family == AF_INET6) {
1286 int flag = sep->se_nomapped ? 1 : 0;
1287 if (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_V6ONLY,
1288 (char *)&flag, sizeof (flag)) < 0)
1289 syslog(LOG_ERR, "setsockopt (IPV6_V6ONLY): %m");
1290 }
1291 #endif
1292 #undef turnon
1293 #ifdef IPSEC
1294 ipsecsetup(sep);
1295 #endif
1296 if (sep->se_family == AF_UNIX) {
1297 (void) unlink(sep->se_ctrladdr_un.sun_path);
1298 umask(0777); /* Make socket with conservative permissions */
1299 }
1300 if (bind(sep->se_fd, (struct sockaddr *)&sep->se_ctrladdr,
1301 sep->se_ctrladdr_size) < 0) {
1302 if (debug)
1303 warn("bind failed on %s/%s",
1304 sep->se_service, sep->se_proto);
1305 syslog(LOG_ERR, "%s/%s: bind: %m",
1306 sep->se_service, sep->se_proto);
1307 (void) close(sep->se_fd);
1308 sep->se_fd = -1;
1309 if (!timingout) {
1310 timingout = 1;
1311 alarm(RETRYTIME);
1312 }
1313 if (sep->se_family == AF_UNIX)
1314 umask(mask);
1315 return;
1316 }
1317 if (sep->se_family == AF_UNIX) {
1318 /* Ick - fch{own,mod} don't work on Unix domain sockets */
1319 if (chown(sep->se_service, sep->se_sockuid, sep->se_sockgid) < 0)
1320 syslog(LOG_ERR, "chown socket: %m");
1321 if (chmod(sep->se_service, sep->se_sockmode) < 0)
1322 syslog(LOG_ERR, "chmod socket: %m");
1323 umask(mask);
1324 }
1325 if (sep->se_rpc) {
1326 u_int i;
1327 socklen_t len = sep->se_ctrladdr_size;
1328 struct netconfig *netid, *netid2 = NULL;
1329 #ifdef INET6
1330 struct sockaddr_in sock;
1331 #endif
1332 struct netbuf nbuf, nbuf2;
1333
1334 if (getsockname(sep->se_fd,
1335 (struct sockaddr*)&sep->se_ctrladdr, &len) < 0){
1336 syslog(LOG_ERR, "%s/%s: getsockname: %m",
1337 sep->se_service, sep->se_proto);
1338 (void) close(sep->se_fd);
1339 sep->se_fd = -1;
1340 return;
1341 }
1342 nbuf.buf = &sep->se_ctrladdr;
1343 nbuf.len = sep->se_ctrladdr.sa_len;
1344 if (sep->se_family == AF_INET)
1345 netid = sep->se_socktype==SOCK_DGRAM? udpconf:tcpconf;
1346 #ifdef INET6
1347 else {
1348 netid = sep->se_socktype==SOCK_DGRAM? udp6conf:tcp6conf;
1349 if (!sep->se_nomapped) { /* INET and INET6 */
1350 netid2 = netid==udp6conf? udpconf:tcpconf;
1351 memset(&sock, 0, sizeof sock); /* ADDR_ANY */
1352 nbuf2.buf = &sock;
1353 nbuf2.len = sock.sin_len = sizeof sock;
1354 sock.sin_family = AF_INET;
1355 sock.sin_port = sep->se_ctrladdr6.sin6_port;
1356 }
1357 }
1358 #endif
1359 if (debug)
1360 print_service("REG ", sep);
1361 for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++) {
1362 rpcb_unset(sep->se_rpc_prog, i, netid);
1363 rpcb_set(sep->se_rpc_prog, i, netid, &nbuf);
1364 if (netid2) {
1365 rpcb_unset(sep->se_rpc_prog, i, netid2);
1366 rpcb_set(sep->se_rpc_prog, i, netid2, &nbuf2);
1367 }
1368 }
1369 }
1370 if (sep->se_socktype == SOCK_STREAM)
1371 listen(sep->se_fd, -1);
1372 enable(sep);
1373 if (debug) {
1374 warnx("registered %s on %d",
1375 sep->se_server, sep->se_fd);
1376 }
1377 }
1378
1379 #ifdef IPSEC
1380 static void
ipsecsetup(struct servtab * sep)1381 ipsecsetup(struct servtab *sep)
1382 {
1383 char *buf;
1384 char *policy_in = NULL;
1385 char *policy_out = NULL;
1386 int level;
1387 int opt;
1388
1389 switch (sep->se_family) {
1390 case AF_INET:
1391 level = IPPROTO_IP;
1392 opt = IP_IPSEC_POLICY;
1393 break;
1394 #ifdef INET6
1395 case AF_INET6:
1396 level = IPPROTO_IPV6;
1397 opt = IPV6_IPSEC_POLICY;
1398 break;
1399 #endif
1400 default:
1401 return;
1402 }
1403
1404 if (!sep->se_policy || sep->se_policy[0] == '\0') {
1405 static char def_in[] = "in entrust", def_out[] = "out entrust";
1406 policy_in = def_in;
1407 policy_out = def_out;
1408 } else {
1409 if (!strncmp("in", sep->se_policy, 2))
1410 policy_in = sep->se_policy;
1411 else if (!strncmp("out", sep->se_policy, 3))
1412 policy_out = sep->se_policy;
1413 else {
1414 syslog(LOG_ERR, "invalid security policy \"%s\"",
1415 sep->se_policy);
1416 return;
1417 }
1418 }
1419
1420 if (policy_in != NULL) {
1421 buf = ipsec_set_policy(policy_in, strlen(policy_in));
1422 if (buf != NULL) {
1423 if (setsockopt(sep->se_fd, level, opt,
1424 buf, ipsec_get_policylen(buf)) < 0 &&
1425 debug != 0)
1426 warnx("%s/%s: ipsec initialization failed; %s",
1427 sep->se_service, sep->se_proto,
1428 policy_in);
1429 free(buf);
1430 } else
1431 syslog(LOG_ERR, "invalid security policy \"%s\"",
1432 policy_in);
1433 }
1434 if (policy_out != NULL) {
1435 buf = ipsec_set_policy(policy_out, strlen(policy_out));
1436 if (buf != NULL) {
1437 if (setsockopt(sep->se_fd, level, opt,
1438 buf, ipsec_get_policylen(buf)) < 0 &&
1439 debug != 0)
1440 warnx("%s/%s: ipsec initialization failed; %s",
1441 sep->se_service, sep->se_proto,
1442 policy_out);
1443 free(buf);
1444 } else
1445 syslog(LOG_ERR, "invalid security policy \"%s\"",
1446 policy_out);
1447 }
1448 }
1449 #endif
1450
1451 /*
1452 * Finish with a service and its socket.
1453 */
1454 static void
close_sep(struct servtab * sep)1455 close_sep(struct servtab *sep)
1456 {
1457 if (sep->se_fd >= 0) {
1458 if (FD_ISSET(sep->se_fd, &allsock))
1459 disable(sep);
1460 (void) close(sep->se_fd);
1461 sep->se_fd = -1;
1462 }
1463 sep->se_count = 0;
1464 sep->se_numchild = 0; /* forget about any existing children */
1465 }
1466
1467 static int
matchservent(const char * name1,const char * name2,const char * proto)1468 matchservent(const char *name1, const char *name2, const char *proto)
1469 {
1470 char **alias, *p;
1471 struct servent *se;
1472
1473 if (strcmp(proto, "unix") == 0) {
1474 if ((p = strrchr(name1, '/')) != NULL)
1475 name1 = p + 1;
1476 if ((p = strrchr(name2, '/')) != NULL)
1477 name2 = p + 1;
1478 }
1479 if (strcmp(name1, name2) == 0)
1480 return(1);
1481 if ((se = getservbyname(name1, proto)) != NULL) {
1482 if (strcmp(name2, se->s_name) == 0)
1483 return(1);
1484 for (alias = se->s_aliases; *alias; alias++)
1485 if (strcmp(name2, *alias) == 0)
1486 return(1);
1487 }
1488 return(0);
1489 }
1490
1491 static struct servtab *
enter(struct servtab * cp)1492 enter(struct servtab *cp)
1493 {
1494 struct servtab *sep;
1495 long omask;
1496
1497 sep = (struct servtab *)malloc(sizeof (*sep));
1498 if (sep == (struct servtab *)0) {
1499 syslog(LOG_ERR, "malloc: %m");
1500 exit(EX_OSERR);
1501 }
1502 *sep = *cp;
1503 sep->se_fd = -1;
1504 omask = sigblock(SIGBLOCK);
1505 sep->se_next = servtab;
1506 servtab = sep;
1507 sigsetmask(omask);
1508 return (sep);
1509 }
1510
1511 static void
enable(struct servtab * sep)1512 enable(struct servtab *sep)
1513 {
1514 if (debug)
1515 warnx(
1516 "enabling %s, fd %d", sep->se_service, sep->se_fd);
1517 #ifdef SANITY_CHECK
1518 if (sep->se_fd < 0) {
1519 syslog(LOG_ERR,
1520 "%s: %s: bad fd", __func__, sep->se_service);
1521 exit(EX_SOFTWARE);
1522 }
1523 if (ISMUX(sep)) {
1524 syslog(LOG_ERR,
1525 "%s: %s: is mux", __func__, sep->se_service);
1526 exit(EX_SOFTWARE);
1527 }
1528 if (FD_ISSET(sep->se_fd, &allsock)) {
1529 syslog(LOG_ERR,
1530 "%s: %s: not off", __func__, sep->se_service);
1531 exit(EX_SOFTWARE);
1532 }
1533 nsock++;
1534 #endif
1535 FD_SET(sep->se_fd, &allsock);
1536 if (sep->se_fd > maxsock)
1537 maxsock = sep->se_fd;
1538 }
1539
1540 static void
disable(struct servtab * sep)1541 disable(struct servtab *sep)
1542 {
1543 if (debug)
1544 warnx(
1545 "disabling %s, fd %d", sep->se_service, sep->se_fd);
1546 #ifdef SANITY_CHECK
1547 if (sep->se_fd < 0) {
1548 syslog(LOG_ERR,
1549 "%s: %s: bad fd", __func__, sep->se_service);
1550 exit(EX_SOFTWARE);
1551 }
1552 if (ISMUX(sep)) {
1553 syslog(LOG_ERR,
1554 "%s: %s: is mux", __func__, sep->se_service);
1555 exit(EX_SOFTWARE);
1556 }
1557 if (!FD_ISSET(sep->se_fd, &allsock)) {
1558 syslog(LOG_ERR,
1559 "%s: %s: not on", __func__, sep->se_service);
1560 exit(EX_SOFTWARE);
1561 }
1562 if (nsock == 0) {
1563 syslog(LOG_ERR, "%s: nsock=0", __func__);
1564 exit(EX_SOFTWARE);
1565 }
1566 nsock--;
1567 #endif
1568 FD_CLR(sep->se_fd, &allsock);
1569 if (sep->se_fd == maxsock)
1570 maxsock--;
1571 }
1572
1573 static FILE *fconfig = NULL;
1574 static struct servtab serv;
1575 static char line[LINE_MAX];
1576
1577 static int
setconfig(void)1578 setconfig(void)
1579 {
1580
1581 if (fconfig != NULL) {
1582 fseek(fconfig, 0L, SEEK_SET);
1583 return (1);
1584 }
1585 fconfig = fopen(CONFIG, "r");
1586 return (fconfig != NULL);
1587 }
1588
1589 static void
endconfig(void)1590 endconfig(void)
1591 {
1592 if (fconfig) {
1593 (void) fclose(fconfig);
1594 fconfig = NULL;
1595 }
1596 }
1597
1598 static struct servtab *
getconfigent(void)1599 getconfigent(void)
1600 {
1601 struct servtab *sep = &serv;
1602 int argc;
1603 char *cp, *arg, *s;
1604 char *versp;
1605 static char TCPMUX_TOKEN[] = "tcpmux/";
1606 #define MUX_LEN (sizeof(TCPMUX_TOKEN)-1)
1607 #ifdef IPSEC
1608 char *policy;
1609 #endif
1610 int v4bind;
1611 #ifdef INET6
1612 int v6bind;
1613 #endif
1614 int i;
1615
1616 #ifdef IPSEC
1617 policy = NULL;
1618 #endif
1619 more:
1620 v4bind = 0;
1621 #ifdef INET6
1622 v6bind = 0;
1623 #endif
1624 while ((cp = nextline(fconfig)) != NULL) {
1625 #ifdef IPSEC
1626 /* lines starting with #@ is not a comment, but the policy */
1627 if (cp[0] == '#' && cp[1] == '@') {
1628 char *p;
1629 for (p = cp + 2; p && *p && isspace(*p); p++)
1630 ;
1631 if (*p == '\0') {
1632 if (policy)
1633 free(policy);
1634 policy = NULL;
1635 } else if (ipsec_get_policylen(p) >= 0) {
1636 if (policy)
1637 free(policy);
1638 policy = newstr(p);
1639 } else {
1640 syslog(LOG_ERR,
1641 "%s: invalid ipsec policy \"%s\"",
1642 CONFIG, p);
1643 exit(EX_CONFIG);
1644 }
1645 }
1646 #endif
1647 if (*cp == '#' || *cp == '\0')
1648 continue;
1649 break;
1650 }
1651 if (cp == NULL)
1652 return ((struct servtab *)0);
1653 /*
1654 * clear the static buffer, since some fields (se_ctrladdr,
1655 * for example) don't get initialized here.
1656 */
1657 memset(sep, 0, sizeof *sep);
1658 arg = skip(&cp);
1659 if (cp == NULL) {
1660 /* got an empty line containing just blanks/tabs. */
1661 goto more;
1662 }
1663 if (arg[0] == ':') { /* :user:group:perm: */
1664 char *user, *group, *perm;
1665 struct passwd *pw;
1666 struct group *gr;
1667 user = arg+1;
1668 if ((group = strchr(user, ':')) == NULL) {
1669 syslog(LOG_ERR, "no group after user '%s'", user);
1670 goto more;
1671 }
1672 *group++ = '\0';
1673 if ((perm = strchr(group, ':')) == NULL) {
1674 syslog(LOG_ERR, "no mode after group '%s'", group);
1675 goto more;
1676 }
1677 *perm++ = '\0';
1678 if ((pw = getpwnam(user)) == NULL) {
1679 syslog(LOG_ERR, "no such user '%s'", user);
1680 goto more;
1681 }
1682 sep->se_sockuid = pw->pw_uid;
1683 if ((gr = getgrnam(group)) == NULL) {
1684 syslog(LOG_ERR, "no such user '%s'", group);
1685 goto more;
1686 }
1687 sep->se_sockgid = gr->gr_gid;
1688 sep->se_sockmode = strtol(perm, &arg, 8);
1689 if (*arg != ':') {
1690 syslog(LOG_ERR, "bad mode '%s'", perm);
1691 goto more;
1692 }
1693 *arg++ = '\0';
1694 } else {
1695 sep->se_sockuid = euid;
1696 sep->se_sockgid = egid;
1697 sep->se_sockmode = 0200;
1698 }
1699 if (strncmp(arg, TCPMUX_TOKEN, MUX_LEN) == 0) {
1700 char *c = arg + MUX_LEN;
1701 if (*c == '+') {
1702 sep->se_type = MUXPLUS_TYPE;
1703 c++;
1704 } else
1705 sep->se_type = MUX_TYPE;
1706 sep->se_service = newstr(c);
1707 } else {
1708 sep->se_service = newstr(arg);
1709 sep->se_type = NORM_TYPE;
1710 }
1711 arg = sskip(&cp);
1712 if (strcmp(arg, "stream") == 0)
1713 sep->se_socktype = SOCK_STREAM;
1714 else if (strcmp(arg, "dgram") == 0)
1715 sep->se_socktype = SOCK_DGRAM;
1716 else if (strcmp(arg, "rdm") == 0)
1717 sep->se_socktype = SOCK_RDM;
1718 else if (strcmp(arg, "seqpacket") == 0)
1719 sep->se_socktype = SOCK_SEQPACKET;
1720 else if (strcmp(arg, "raw") == 0)
1721 sep->se_socktype = SOCK_RAW;
1722 else
1723 sep->se_socktype = -1;
1724
1725 arg = sskip(&cp);
1726 if (strncmp(arg, "tcp", 3) == 0) {
1727 sep->se_proto = newstr(strsep(&arg, "/"));
1728 if (arg != NULL && (strcmp(arg, "faith") == 0)) {
1729 syslog(LOG_ERR, "faith has been deprecated");
1730 goto more;
1731 }
1732 } else {
1733 if (sep->se_type == NORM_TYPE &&
1734 strncmp(arg, "faith/", 6) == 0) {
1735 syslog(LOG_ERR, "faith has been deprecated");
1736 goto more;
1737 }
1738 sep->se_proto = newstr(arg);
1739 }
1740 if (strncmp(sep->se_proto, "rpc/", 4) == 0) {
1741 memmove(sep->se_proto, sep->se_proto + 4,
1742 strlen(sep->se_proto) + 1 - 4);
1743 sep->se_rpc = 1;
1744 sep->se_rpc_prog = sep->se_rpc_lowvers =
1745 sep->se_rpc_highvers = 0;
1746 if ((versp = strrchr(sep->se_service, '/'))) {
1747 *versp++ = '\0';
1748 switch (sscanf(versp, "%u-%u",
1749 &sep->se_rpc_lowvers,
1750 &sep->se_rpc_highvers)) {
1751 case 2:
1752 break;
1753 case 1:
1754 sep->se_rpc_highvers =
1755 sep->se_rpc_lowvers;
1756 break;
1757 default:
1758 syslog(LOG_ERR,
1759 "bad RPC version specifier; %s",
1760 sep->se_service);
1761 freeconfig(sep);
1762 goto more;
1763 }
1764 }
1765 else {
1766 sep->se_rpc_lowvers =
1767 sep->se_rpc_highvers = 1;
1768 }
1769 }
1770 sep->se_nomapped = 0;
1771 if (strcmp(sep->se_proto, "unix") == 0) {
1772 sep->se_family = AF_UNIX;
1773 } else {
1774 while (isdigit(sep->se_proto[strlen(sep->se_proto) - 1])) {
1775 #ifdef INET6
1776 if (sep->se_proto[strlen(sep->se_proto) - 1] == '6') {
1777 sep->se_proto[strlen(sep->se_proto) - 1] = '\0';
1778 v6bind = 1;
1779 continue;
1780 }
1781 #endif
1782 if (sep->se_proto[strlen(sep->se_proto) - 1] == '4') {
1783 sep->se_proto[strlen(sep->se_proto) - 1] = '\0';
1784 v4bind = 1;
1785 continue;
1786 }
1787 /* illegal version num */
1788 syslog(LOG_ERR, "bad IP version for %s", sep->se_proto);
1789 freeconfig(sep);
1790 goto more;
1791 }
1792 #ifdef INET6
1793 if (v6bind && !v6bind_ok) {
1794 syslog(LOG_INFO, "IPv6 bind is ignored for %s",
1795 sep->se_service);
1796 if (v4bind && v4bind_ok)
1797 v6bind = 0;
1798 else {
1799 freeconfig(sep);
1800 goto more;
1801 }
1802 }
1803 if (v6bind) {
1804 sep->se_family = AF_INET6;
1805 if (!v4bind || !v4bind_ok)
1806 sep->se_nomapped = 1;
1807 } else
1808 #endif
1809 { /* default to v4 bind if not v6 bind */
1810 if (!v4bind_ok) {
1811 syslog(LOG_NOTICE, "IPv4 bind is ignored for %s",
1812 sep->se_service);
1813 freeconfig(sep);
1814 goto more;
1815 }
1816 sep->se_family = AF_INET;
1817 }
1818 }
1819 /* init ctladdr */
1820 switch(sep->se_family) {
1821 case AF_INET:
1822 memcpy(&sep->se_ctrladdr4, bind_sa4,
1823 sizeof(sep->se_ctrladdr4));
1824 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr4);
1825 break;
1826 #ifdef INET6
1827 case AF_INET6:
1828 memcpy(&sep->se_ctrladdr6, bind_sa6,
1829 sizeof(sep->se_ctrladdr6));
1830 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr6);
1831 break;
1832 #endif
1833 case AF_UNIX:
1834 if (strlen(sep->se_service) >= sizeof(sep->se_ctrladdr_un.sun_path)) {
1835 syslog(LOG_ERR,
1836 "domain socket pathname too long for service %s",
1837 sep->se_service);
1838 goto more;
1839 }
1840 memset(&sep->se_ctrladdr, 0, sizeof(sep->se_ctrladdr));
1841 sep->se_ctrladdr_un.sun_family = sep->se_family;
1842 sep->se_ctrladdr_un.sun_len = strlen(sep->se_service);
1843 strcpy(sep->se_ctrladdr_un.sun_path, sep->se_service);
1844 sep->se_ctrladdr_size = SUN_LEN(&sep->se_ctrladdr_un);
1845 }
1846 arg = sskip(&cp);
1847 if (!strncmp(arg, "wait", 4))
1848 sep->se_accept = 0;
1849 else if (!strncmp(arg, "nowait", 6))
1850 sep->se_accept = 1;
1851 else {
1852 syslog(LOG_ERR,
1853 "%s: bad wait/nowait for service %s",
1854 CONFIG, sep->se_service);
1855 goto more;
1856 }
1857 sep->se_maxchild = -1;
1858 sep->se_maxcpm = -1;
1859 sep->se_maxperip = -1;
1860 if ((s = strchr(arg, '/')) != NULL) {
1861 char *eptr;
1862 u_long val;
1863
1864 val = strtoul(s + 1, &eptr, 10);
1865 if (eptr == s + 1 || val > MAX_MAXCHLD) {
1866 syslog(LOG_ERR,
1867 "%s: bad max-child for service %s",
1868 CONFIG, sep->se_service);
1869 goto more;
1870 }
1871 if (debug)
1872 if (!sep->se_accept && val != 1)
1873 warnx("maxchild=%lu for wait service %s"
1874 " not recommended", val, sep->se_service);
1875 sep->se_maxchild = val;
1876 if (*eptr == '/')
1877 sep->se_maxcpm = strtol(eptr + 1, &eptr, 10);
1878 if (*eptr == '/')
1879 sep->se_maxperip = strtol(eptr + 1, &eptr, 10);
1880 /*
1881 * explicitly do not check for \0 for future expansion /
1882 * backwards compatibility
1883 */
1884 }
1885 if (ISMUX(sep)) {
1886 /*
1887 * Silently enforce "nowait" mode for TCPMUX services
1888 * since they don't have an assigned port to listen on.
1889 */
1890 sep->se_accept = 1;
1891 if (strcmp(sep->se_proto, "tcp")) {
1892 syslog(LOG_ERR,
1893 "%s: bad protocol for tcpmux service %s",
1894 CONFIG, sep->se_service);
1895 goto more;
1896 }
1897 if (sep->se_socktype != SOCK_STREAM) {
1898 syslog(LOG_ERR,
1899 "%s: bad socket type for tcpmux service %s",
1900 CONFIG, sep->se_service);
1901 goto more;
1902 }
1903 }
1904 sep->se_user = newstr(sskip(&cp));
1905 #ifdef LOGIN_CAP
1906 if ((s = strrchr(sep->se_user, '/')) != NULL) {
1907 *s = '\0';
1908 sep->se_class = newstr(s + 1);
1909 } else
1910 sep->se_class = newstr(RESOURCE_RC);
1911 #endif
1912 if ((s = strrchr(sep->se_user, ':')) != NULL) {
1913 *s = '\0';
1914 sep->se_group = newstr(s + 1);
1915 } else
1916 sep->se_group = NULL;
1917 sep->se_server = newstr(sskip(&cp));
1918 if ((sep->se_server_name = strrchr(sep->se_server, '/')))
1919 sep->se_server_name++;
1920 if (strcmp(sep->se_server, "internal") == 0) {
1921 struct biltin *bi;
1922
1923 for (bi = biltins; bi->bi_service; bi++)
1924 if (bi->bi_socktype == sep->se_socktype &&
1925 matchservent(bi->bi_service, sep->se_service,
1926 sep->se_proto))
1927 break;
1928 if (bi->bi_service == 0) {
1929 syslog(LOG_ERR, "internal service %s unknown",
1930 sep->se_service);
1931 goto more;
1932 }
1933 sep->se_accept = 1; /* force accept mode for built-ins */
1934 sep->se_bi = bi;
1935 } else
1936 sep->se_bi = NULL;
1937 if (sep->se_maxperip < 0)
1938 sep->se_maxperip = maxperip;
1939 if (sep->se_maxcpm < 0)
1940 sep->se_maxcpm = maxcpm;
1941 if (sep->se_maxchild < 0) { /* apply default max-children */
1942 if (sep->se_bi && sep->se_bi->bi_maxchild >= 0)
1943 sep->se_maxchild = sep->se_bi->bi_maxchild;
1944 else if (sep->se_accept)
1945 sep->se_maxchild = MAX(maxchild, 0);
1946 else
1947 sep->se_maxchild = 1;
1948 }
1949 if (sep->se_maxchild > 0) {
1950 sep->se_pids = malloc(sep->se_maxchild * sizeof(*sep->se_pids));
1951 if (sep->se_pids == NULL) {
1952 syslog(LOG_ERR, "malloc: %m");
1953 exit(EX_OSERR);
1954 }
1955 }
1956 argc = 0;
1957 for (arg = skip(&cp); cp; arg = skip(&cp))
1958 if (argc < MAXARGV) {
1959 sep->se_argv[argc++] = newstr(arg);
1960 } else {
1961 syslog(LOG_ERR,
1962 "%s: too many arguments for service %s",
1963 CONFIG, sep->se_service);
1964 goto more;
1965 }
1966 while (argc <= MAXARGV)
1967 sep->se_argv[argc++] = NULL;
1968 for (i = 0; i < PERIPSIZE; ++i)
1969 LIST_INIT(&sep->se_conn[i]);
1970 #ifdef IPSEC
1971 sep->se_policy = policy ? newstr(policy) : NULL;
1972 #endif
1973 return (sep);
1974 }
1975
1976 static void
freeconfig(struct servtab * cp)1977 freeconfig(struct servtab *cp)
1978 {
1979 int i;
1980
1981 if (cp->se_service)
1982 free(cp->se_service);
1983 if (cp->se_proto)
1984 free(cp->se_proto);
1985 if (cp->se_user)
1986 free(cp->se_user);
1987 if (cp->se_group)
1988 free(cp->se_group);
1989 #ifdef LOGIN_CAP
1990 if (cp->se_class)
1991 free(cp->se_class);
1992 #endif
1993 if (cp->se_server)
1994 free(cp->se_server);
1995 if (cp->se_pids)
1996 free(cp->se_pids);
1997 for (i = 0; i < MAXARGV; i++)
1998 if (cp->se_argv[i])
1999 free(cp->se_argv[i]);
2000 free_connlist(cp);
2001 #ifdef IPSEC
2002 if (cp->se_policy)
2003 free(cp->se_policy);
2004 #endif
2005 }
2006
2007
2008 /*
2009 * Safe skip - if skip returns null, log a syntax error in the
2010 * configuration file and exit.
2011 */
2012 static char *
sskip(char ** cpp)2013 sskip(char **cpp)
2014 {
2015 char *cp;
2016
2017 cp = skip(cpp);
2018 if (cp == NULL) {
2019 syslog(LOG_ERR, "%s: syntax error", CONFIG);
2020 exit(EX_DATAERR);
2021 }
2022 return (cp);
2023 }
2024
2025 static char *
skip(char ** cpp)2026 skip(char **cpp)
2027 {
2028 char *cp = *cpp;
2029 char *start;
2030 char quote = '\0';
2031
2032 again:
2033 while (*cp == ' ' || *cp == '\t')
2034 cp++;
2035 if (*cp == '\0') {
2036 int c;
2037
2038 c = getc(fconfig);
2039 (void) ungetc(c, fconfig);
2040 if (c == ' ' || c == '\t')
2041 if ((cp = nextline(fconfig)))
2042 goto again;
2043 *cpp = (char *)0;
2044 return ((char *)0);
2045 }
2046 if (*cp == '"' || *cp == '\'')
2047 quote = *cp++;
2048 start = cp;
2049 if (quote)
2050 while (*cp && *cp != quote)
2051 cp++;
2052 else
2053 while (*cp && *cp != ' ' && *cp != '\t')
2054 cp++;
2055 if (*cp != '\0')
2056 *cp++ = '\0';
2057 *cpp = cp;
2058 return (start);
2059 }
2060
2061 static char *
nextline(FILE * fd)2062 nextline(FILE *fd)
2063 {
2064 char *cp;
2065
2066 if (fgets(line, sizeof (line), fd) == NULL)
2067 return ((char *)0);
2068 cp = strchr(line, '\n');
2069 if (cp)
2070 *cp = '\0';
2071 return (line);
2072 }
2073
2074 static char *
newstr(const char * cp)2075 newstr(const char *cp)
2076 {
2077 char *cr;
2078
2079 if ((cr = strdup(cp != NULL ? cp : "")))
2080 return (cr);
2081 syslog(LOG_ERR, "strdup: %m");
2082 exit(EX_OSERR);
2083 }
2084
2085 void
inetd_setproctitle(const char * a,int s)2086 inetd_setproctitle(const char *a, int s)
2087 {
2088 socklen_t size;
2089 struct sockaddr_storage ss;
2090 char buf[80], pbuf[NI_MAXHOST];
2091
2092 size = sizeof(ss);
2093 if (getpeername(s, (struct sockaddr *)&ss, &size) == 0) {
2094 getnameinfo((struct sockaddr *)&ss, size, pbuf, sizeof(pbuf),
2095 NULL, 0, NI_NUMERICHOST);
2096 (void) sprintf(buf, "%s [%s]", a, pbuf);
2097 } else
2098 (void) sprintf(buf, "%s", a);
2099 setproctitle("%s", buf);
2100 }
2101
2102 int
check_loop(const struct sockaddr * sa,const struct servtab * sep)2103 check_loop(const struct sockaddr *sa, const struct servtab *sep)
2104 {
2105 struct servtab *se2;
2106 char pname[NI_MAXHOST];
2107
2108 for (se2 = servtab; se2; se2 = se2->se_next) {
2109 if (!se2->se_bi || se2->se_socktype != SOCK_DGRAM)
2110 continue;
2111
2112 switch (se2->se_family) {
2113 case AF_INET:
2114 if (csatosin(sa)->sin_port ==
2115 se2->se_ctrladdr4.sin_port)
2116 goto isloop;
2117 continue;
2118 #ifdef INET6
2119 case AF_INET6:
2120 if (csatosin6(sa)->sin6_port ==
2121 se2->se_ctrladdr6.sin6_port)
2122 goto isloop;
2123 continue;
2124 #endif
2125 default:
2126 continue;
2127 }
2128 isloop:
2129 getnameinfo(sa, sa->sa_len, pname, sizeof(pname), NULL, 0,
2130 NI_NUMERICHOST);
2131 syslog(LOG_WARNING, "%s/%s:%s/%s loop request REFUSED from %s",
2132 sep->se_service, sep->se_proto,
2133 se2->se_service, se2->se_proto,
2134 pname);
2135 return 1;
2136 }
2137 return 0;
2138 }
2139
2140 /*
2141 * print_service:
2142 * Dump relevant information to stderr
2143 */
2144 static void
print_service(const char * action,const struct servtab * sep)2145 print_service(const char *action, const struct servtab *sep)
2146 {
2147 fprintf(stderr,
2148 "%s: %s proto=%s accept=%d max=%d user=%s group=%s"
2149 #ifdef LOGIN_CAP
2150 "class=%s"
2151 #endif
2152 " builtin=%p server=%s"
2153 #ifdef IPSEC
2154 " policy=\"%s\""
2155 #endif
2156 "\n",
2157 action, sep->se_service, sep->se_proto,
2158 sep->se_accept, sep->se_maxchild, sep->se_user, sep->se_group,
2159 #ifdef LOGIN_CAP
2160 sep->se_class,
2161 #endif
2162 (void *) sep->se_bi, sep->se_server
2163 #ifdef IPSEC
2164 , (sep->se_policy ? sep->se_policy : "")
2165 #endif
2166 );
2167 }
2168
2169 #define CPMHSIZE 256
2170 #define CPMHMASK (CPMHSIZE-1)
2171 #define CHTGRAN 10
2172 #define CHTSIZE 6
2173
2174 typedef struct CTime {
2175 unsigned long ct_Ticks;
2176 int ct_Count;
2177 } CTime;
2178
2179 typedef struct CHash {
2180 union {
2181 struct in_addr c4_Addr;
2182 struct in6_addr c6_Addr;
2183 } cu_Addr;
2184 #define ch_Addr4 cu_Addr.c4_Addr
2185 #define ch_Addr6 cu_Addr.c6_Addr
2186 int ch_Family;
2187 time_t ch_LTime;
2188 char *ch_Service;
2189 CTime ch_Times[CHTSIZE];
2190 } CHash;
2191
2192 static CHash CHashAry[CPMHSIZE];
2193
2194 static int
cpmip(const struct servtab * sep,int ctrl)2195 cpmip(const struct servtab *sep, int ctrl)
2196 {
2197 struct sockaddr_storage rss;
2198 socklen_t rssLen = sizeof(rss);
2199 int r = 0;
2200
2201 /*
2202 * If getpeername() fails, just let it through (if logging is
2203 * enabled the condition is caught elsewhere)
2204 */
2205
2206 if (sep->se_maxcpm > 0 &&
2207 (sep->se_family == AF_INET || sep->se_family == AF_INET6) &&
2208 getpeername(ctrl, (struct sockaddr *)&rss, &rssLen) == 0 ) {
2209 time_t t = time(NULL);
2210 int hv = 0xABC3D20F;
2211 int i;
2212 int cnt = 0;
2213 CHash *chBest = NULL;
2214 unsigned int ticks = t / CHTGRAN;
2215 struct sockaddr_in *sin4;
2216 #ifdef INET6
2217 struct sockaddr_in6 *sin6;
2218 #endif
2219
2220 sin4 = (struct sockaddr_in *)&rss;
2221 #ifdef INET6
2222 sin6 = (struct sockaddr_in6 *)&rss;
2223 #endif
2224 {
2225 char *p;
2226 int addrlen;
2227
2228 switch (rss.ss_family) {
2229 case AF_INET:
2230 p = (char *)&sin4->sin_addr;
2231 addrlen = sizeof(struct in_addr);
2232 break;
2233 #ifdef INET6
2234 case AF_INET6:
2235 p = (char *)&sin6->sin6_addr;
2236 addrlen = sizeof(struct in6_addr);
2237 break;
2238 #endif
2239 default:
2240 /* should not happen */
2241 return -1;
2242 }
2243
2244 for (i = 0; i < addrlen; ++i, ++p) {
2245 hv = (hv << 5) ^ (hv >> 23) ^ *p;
2246 }
2247 hv = (hv ^ (hv >> 16));
2248 }
2249 for (i = 0; i < 5; ++i) {
2250 CHash *ch = &CHashAry[(hv + i) & CPMHMASK];
2251
2252 if (rss.ss_family == AF_INET &&
2253 ch->ch_Family == AF_INET &&
2254 sin4->sin_addr.s_addr == ch->ch_Addr4.s_addr &&
2255 ch->ch_Service && strcmp(sep->se_service,
2256 ch->ch_Service) == 0) {
2257 chBest = ch;
2258 break;
2259 }
2260 #ifdef INET6
2261 if (rss.ss_family == AF_INET6 &&
2262 ch->ch_Family == AF_INET6 &&
2263 IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
2264 &ch->ch_Addr6) != 0 &&
2265 ch->ch_Service && strcmp(sep->se_service,
2266 ch->ch_Service) == 0) {
2267 chBest = ch;
2268 break;
2269 }
2270 #endif
2271 if (chBest == NULL || ch->ch_LTime == 0 ||
2272 ch->ch_LTime < chBest->ch_LTime) {
2273 chBest = ch;
2274 }
2275 }
2276 if ((rss.ss_family == AF_INET &&
2277 (chBest->ch_Family != AF_INET ||
2278 sin4->sin_addr.s_addr != chBest->ch_Addr4.s_addr)) ||
2279 chBest->ch_Service == NULL ||
2280 strcmp(sep->se_service, chBest->ch_Service) != 0) {
2281 chBest->ch_Family = sin4->sin_family;
2282 chBest->ch_Addr4 = sin4->sin_addr;
2283 if (chBest->ch_Service)
2284 free(chBest->ch_Service);
2285 chBest->ch_Service = strdup(sep->se_service);
2286 bzero(chBest->ch_Times, sizeof(chBest->ch_Times));
2287 }
2288 #ifdef INET6
2289 if ((rss.ss_family == AF_INET6 &&
2290 (chBest->ch_Family != AF_INET6 ||
2291 IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
2292 &chBest->ch_Addr6) == 0)) ||
2293 chBest->ch_Service == NULL ||
2294 strcmp(sep->se_service, chBest->ch_Service) != 0) {
2295 chBest->ch_Family = sin6->sin6_family;
2296 chBest->ch_Addr6 = sin6->sin6_addr;
2297 if (chBest->ch_Service)
2298 free(chBest->ch_Service);
2299 chBest->ch_Service = strdup(sep->se_service);
2300 bzero(chBest->ch_Times, sizeof(chBest->ch_Times));
2301 }
2302 #endif
2303 chBest->ch_LTime = t;
2304 {
2305 CTime *ct = &chBest->ch_Times[ticks % CHTSIZE];
2306 if (ct->ct_Ticks != ticks) {
2307 ct->ct_Ticks = ticks;
2308 ct->ct_Count = 0;
2309 }
2310 ++ct->ct_Count;
2311 }
2312 for (i = 0; i < CHTSIZE; ++i) {
2313 CTime *ct = &chBest->ch_Times[i];
2314 if (ct->ct_Ticks <= ticks &&
2315 ct->ct_Ticks >= ticks - CHTSIZE) {
2316 cnt += ct->ct_Count;
2317 }
2318 }
2319 if ((cnt * 60) / (CHTSIZE * CHTGRAN) > sep->se_maxcpm) {
2320 char pname[NI_MAXHOST];
2321
2322 getnameinfo((struct sockaddr *)&rss,
2323 ((struct sockaddr *)&rss)->sa_len,
2324 pname, sizeof(pname), NULL, 0,
2325 NI_NUMERICHOST);
2326 r = -1;
2327 syslog(LOG_ERR,
2328 "%s from %s exceeded counts/min (limit %d/min)",
2329 sep->se_service, pname,
2330 sep->se_maxcpm);
2331 }
2332 }
2333 return(r);
2334 }
2335
2336 static struct conninfo *
search_conn(struct servtab * sep,int ctrl)2337 search_conn(struct servtab *sep, int ctrl)
2338 {
2339 struct sockaddr_storage ss;
2340 socklen_t sslen = sizeof(ss);
2341 struct conninfo *conn;
2342 int hv;
2343 char pname[NI_MAXHOST], pname2[NI_MAXHOST];
2344
2345 if (sep->se_maxperip <= 0)
2346 return NULL;
2347
2348 /*
2349 * If getpeername() fails, just let it through (if logging is
2350 * enabled the condition is caught elsewhere)
2351 */
2352 if (getpeername(ctrl, (struct sockaddr *)&ss, &sslen) != 0)
2353 return NULL;
2354
2355 switch (ss.ss_family) {
2356 case AF_INET:
2357 hv = hashval((char *)&((struct sockaddr_in *)&ss)->sin_addr,
2358 sizeof(struct in_addr));
2359 break;
2360 #ifdef INET6
2361 case AF_INET6:
2362 hv = hashval((char *)&((struct sockaddr_in6 *)&ss)->sin6_addr,
2363 sizeof(struct in6_addr));
2364 break;
2365 #endif
2366 default:
2367 /*
2368 * Since we only support AF_INET and AF_INET6, just
2369 * let other than AF_INET and AF_INET6 through.
2370 */
2371 return NULL;
2372 }
2373
2374 if (getnameinfo((struct sockaddr *)&ss, sslen, pname, sizeof(pname),
2375 NULL, 0, NI_NUMERICHOST) != 0)
2376 return NULL;
2377
2378 LIST_FOREACH(conn, &sep->se_conn[hv], co_link) {
2379 if (getnameinfo((struct sockaddr *)&conn->co_addr,
2380 conn->co_addr.ss_len, pname2, sizeof(pname2), NULL, 0,
2381 NI_NUMERICHOST) == 0 &&
2382 strcmp(pname, pname2) == 0)
2383 break;
2384 }
2385
2386 if (conn == NULL) {
2387 if ((conn = malloc(sizeof(struct conninfo))) == NULL) {
2388 syslog(LOG_ERR, "malloc: %m");
2389 exit(EX_OSERR);
2390 }
2391 conn->co_proc = malloc(sep->se_maxperip * sizeof(*conn->co_proc));
2392 if (conn->co_proc == NULL) {
2393 syslog(LOG_ERR, "malloc: %m");
2394 exit(EX_OSERR);
2395 }
2396 memcpy(&conn->co_addr, (struct sockaddr *)&ss, sslen);
2397 conn->co_numchild = 0;
2398 LIST_INSERT_HEAD(&sep->se_conn[hv], conn, co_link);
2399 }
2400
2401 /*
2402 * Since a child process is not invoked yet, we cannot
2403 * determine a pid of a child. So, co_proc and co_numchild
2404 * should be filled leter.
2405 */
2406
2407 return conn;
2408 }
2409
2410 static int
room_conn(struct servtab * sep,struct conninfo * conn)2411 room_conn(struct servtab *sep, struct conninfo *conn)
2412 {
2413 char pname[NI_MAXHOST];
2414
2415 if (conn->co_numchild >= sep->se_maxperip) {
2416 getnameinfo((struct sockaddr *)&conn->co_addr,
2417 conn->co_addr.ss_len, pname, sizeof(pname), NULL, 0,
2418 NI_NUMERICHOST);
2419 syslog(LOG_ERR, "%s from %s exceeded counts (limit %d)",
2420 sep->se_service, pname, sep->se_maxperip);
2421 return 0;
2422 }
2423 return 1;
2424 }
2425
2426 static void
addchild_conn(struct conninfo * conn,pid_t pid)2427 addchild_conn(struct conninfo *conn, pid_t pid)
2428 {
2429 struct procinfo *proc;
2430
2431 if (conn == NULL)
2432 return;
2433
2434 if ((proc = search_proc(pid, 1)) != NULL) {
2435 if (proc->pr_conn != NULL) {
2436 syslog(LOG_ERR,
2437 "addchild_conn: child already on process list");
2438 exit(EX_OSERR);
2439 }
2440 proc->pr_conn = conn;
2441 }
2442
2443 conn->co_proc[conn->co_numchild++] = proc;
2444 }
2445
2446 static void
reapchild_conn(pid_t pid)2447 reapchild_conn(pid_t pid)
2448 {
2449 struct procinfo *proc;
2450 struct conninfo *conn;
2451 int i;
2452
2453 if ((proc = search_proc(pid, 0)) == NULL)
2454 return;
2455 if ((conn = proc->pr_conn) == NULL)
2456 return;
2457 for (i = 0; i < conn->co_numchild; ++i)
2458 if (conn->co_proc[i] == proc) {
2459 conn->co_proc[i] = conn->co_proc[--conn->co_numchild];
2460 break;
2461 }
2462 free_proc(proc);
2463 free_conn(conn);
2464 }
2465
2466 static void
resize_conn(struct servtab * sep,int maxpip)2467 resize_conn(struct servtab *sep, int maxpip)
2468 {
2469 struct conninfo *conn;
2470 int i, j;
2471
2472 if (sep->se_maxperip <= 0)
2473 return;
2474 if (maxpip <= 0) {
2475 free_connlist(sep);
2476 return;
2477 }
2478 for (i = 0; i < PERIPSIZE; ++i) {
2479 LIST_FOREACH(conn, &sep->se_conn[i], co_link) {
2480 for (j = maxpip; j < conn->co_numchild; ++j)
2481 free_proc(conn->co_proc[j]);
2482 conn->co_proc = realloc(conn->co_proc,
2483 maxpip * sizeof(*conn->co_proc));
2484 if (conn->co_proc == NULL) {
2485 syslog(LOG_ERR, "realloc: %m");
2486 exit(EX_OSERR);
2487 }
2488 if (conn->co_numchild > maxpip)
2489 conn->co_numchild = maxpip;
2490 }
2491 }
2492 }
2493
2494 static void
free_connlist(struct servtab * sep)2495 free_connlist(struct servtab *sep)
2496 {
2497 struct conninfo *conn;
2498 int i, j;
2499
2500 for (i = 0; i < PERIPSIZE; ++i) {
2501 while ((conn = LIST_FIRST(&sep->se_conn[i])) != NULL) {
2502 for (j = 0; j < conn->co_numchild; ++j)
2503 free_proc(conn->co_proc[j]);
2504 conn->co_numchild = 0;
2505 free_conn(conn);
2506 }
2507 }
2508 }
2509
2510 static void
free_conn(struct conninfo * conn)2511 free_conn(struct conninfo *conn)
2512 {
2513 if (conn == NULL)
2514 return;
2515 if (conn->co_numchild <= 0) {
2516 LIST_REMOVE(conn, co_link);
2517 free(conn->co_proc);
2518 free(conn);
2519 }
2520 }
2521
2522 static struct procinfo *
search_proc(pid_t pid,int add)2523 search_proc(pid_t pid, int add)
2524 {
2525 struct procinfo *proc;
2526 int hv;
2527
2528 hv = hashval((char *)&pid, sizeof(pid));
2529 LIST_FOREACH(proc, &proctable[hv], pr_link) {
2530 if (proc->pr_pid == pid)
2531 break;
2532 }
2533 if (proc == NULL && add) {
2534 if ((proc = malloc(sizeof(struct procinfo))) == NULL) {
2535 syslog(LOG_ERR, "malloc: %m");
2536 exit(EX_OSERR);
2537 }
2538 proc->pr_pid = pid;
2539 proc->pr_conn = NULL;
2540 LIST_INSERT_HEAD(&proctable[hv], proc, pr_link);
2541 }
2542 return proc;
2543 }
2544
2545 static void
free_proc(struct procinfo * proc)2546 free_proc(struct procinfo *proc)
2547 {
2548 if (proc == NULL)
2549 return;
2550 LIST_REMOVE(proc, pr_link);
2551 free(proc);
2552 }
2553
2554 static int
hashval(char * p,int len)2555 hashval(char *p, int len)
2556 {
2557 int i, hv = 0xABC3D20F;
2558
2559 for (i = 0; i < len; ++i, ++p)
2560 hv = (hv << 5) ^ (hv >> 23) ^ *p;
2561 hv = (hv ^ (hv >> 16)) & (PERIPSIZE - 1);
2562 return hv;
2563 }
2564