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 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
34
35 #ifndef lint
36 __COPYRIGHT("@(#) Copyright (c) 1983, 1991, 1993, 1994\n\
37 The Regents of the University of California. All rights reserved.\n");
38 #endif /* not lint */
39
40 #ifndef lint
41 #if 0
42 static char sccsid[] = "@(#)from: inetd.c 8.4 (Berkeley) 4/13/94";
43 #endif
44 #endif /* not lint */
45
46 /*
47 * Inetd - Internet super-server
48 *
49 * This program invokes all internet services as needed. Connection-oriented
50 * services are invoked each time a connection is made, by creating a process.
51 * This process is passed the connection as file descriptor 0 and is expected
52 * to do a getpeername to find out the source host and port.
53 *
54 * Datagram oriented services are invoked when a datagram
55 * arrives; a process is created and passed a pending message
56 * on file descriptor 0. Datagram servers may either connect
57 * to their peer, freeing up the original socket for inetd
58 * to receive further messages on, or ``take over the socket'',
59 * processing all arriving datagrams and, eventually, timing
60 * out. The first type of server is said to be ``multi-threaded'';
61 * the second type of server ``single-threaded''.
62 *
63 * Inetd uses a configuration file which is read at startup
64 * and, possibly, at some later time in response to a hangup signal.
65 * The configuration file is ``free format'' with fields given in the
66 * order shown below. Continuation lines for an entry must begin with
67 * a space or tab. All fields must be present in each entry.
68 *
69 * service name must be in /etc/services
70 * or name a tcpmux service
71 * or specify a unix domain socket
72 * socket type stream/dgram/raw/rdm/seqpacket
73 * protocol tcp[4][6], udp[4][6], unix
74 * wait/nowait single-threaded/multi-threaded
75 * user[:group][/login-class] user/group/login-class to run daemon as
76 * server program full path name
77 * server program arguments maximum of MAXARGS (20)
78 *
79 * TCP services without official port numbers are handled with the
80 * RFC1078-based tcpmux internal service. Tcpmux listens on port 1 for
81 * requests. When a connection is made from a foreign host, the service
82 * requested is passed to tcpmux, which looks it up in the servtab list
83 * and returns the proper entry for the service. Tcpmux returns a
84 * negative reply if the service doesn't exist, otherwise the invoked
85 * server is expected to return the positive reply if the service type in
86 * inetd.conf file has the prefix "tcpmux/". If the service type has the
87 * prefix "tcpmux/+", tcpmux will return the positive reply for the
88 * process; this is for compatibility with older server code, and also
89 * allows you to invoke programs that use stdin/stdout without putting any
90 * special server code in them. Services that use tcpmux are "nowait"
91 * because they do not have a well-known port and hence cannot listen
92 * for new requests.
93 *
94 * For RPC services
95 * service name/version must be in /etc/rpc
96 * socket type stream/dgram/raw/rdm/seqpacket
97 * protocol rpc/tcp[4][6], rpc/udp[4][6]
98 * wait/nowait single-threaded/multi-threaded
99 * user[:group][/login-class] user/group/login-class to run daemon as
100 * server program full path name
101 * server program arguments maximum of MAXARGS
102 *
103 * Comment lines are indicated by a `#' in column 1.
104 *
105 * #ifdef IPSEC
106 * Comment lines that start with "#@" denote IPsec policy string, as described
107 * in ipsec_set_policy(3). This will affect all the following items in
108 * inetd.conf(8). To reset the policy, just use "#@" line. By default,
109 * there's no IPsec policy.
110 * #endif
111 */
112 #include <sys/param.h>
113 #include <sys/ioctl.h>
114 #include <sys/mman.h>
115 #include <sys/wait.h>
116 #include <sys/time.h>
117 #include <sys/resource.h>
118 #include <sys/stat.h>
119 #include <sys/un.h>
120
121 #include <netinet/in.h>
122 #include <netinet/tcp.h>
123 #include <arpa/inet.h>
124 #include <rpc/rpc.h>
125 #include <rpc/pmap_clnt.h>
126
127 #include <ctype.h>
128 #include <errno.h>
129 #include <err.h>
130 #include <fcntl.h>
131 #include <grp.h>
132 #include <libutil.h>
133 #include <limits.h>
134 #include <netdb.h>
135 #include <pwd.h>
136 #include <signal.h>
137 #include <stdio.h>
138 #include <stdlib.h>
139 #include <string.h>
140 #include <sysexits.h>
141 #include <syslog.h>
142 #ifdef LIBWRAP
143 #include <tcpd.h>
144 #endif
145 #include <unistd.h>
146
147 #include "inetd.h"
148 #include "pathnames.h"
149
150 #ifdef IPSEC
151 #include <netipsec/ipsec.h>
152 #ifndef IPSEC_POLICY_IPSEC /* no ipsec support on old ipsec */
153 #undef IPSEC
154 #endif
155 #endif
156
157 #ifndef LIBWRAP_ALLOW_FACILITY
158 # define LIBWRAP_ALLOW_FACILITY LOG_AUTH
159 #endif
160 #ifndef LIBWRAP_ALLOW_SEVERITY
161 # define LIBWRAP_ALLOW_SEVERITY LOG_INFO
162 #endif
163 #ifndef LIBWRAP_DENY_FACILITY
164 # define LIBWRAP_DENY_FACILITY LOG_AUTH
165 #endif
166 #ifndef LIBWRAP_DENY_SEVERITY
167 # define LIBWRAP_DENY_SEVERITY LOG_WARNING
168 #endif
169
170 #define ISWRAP(sep) \
171 ( ((wrap_ex && !(sep)->se_bi) || (wrap_bi && (sep)->se_bi)) \
172 && (sep->se_family == AF_INET || sep->se_family == AF_INET6) \
173 && ( ((sep)->se_accept && (sep)->se_socktype == SOCK_STREAM) \
174 || (sep)->se_socktype == SOCK_DGRAM))
175
176 #ifdef LOGIN_CAP
177 #include <login_cap.h>
178
179 /* see init.c */
180 #define RESOURCE_RC "daemon"
181
182 #endif
183
184 #ifndef MAXCHILD
185 #define MAXCHILD -1 /* maximum number of this service
186 < 0 = no limit */
187 #endif
188
189 #ifndef MAXCPM
190 #define MAXCPM -1 /* rate limit invocations from a
191 single remote address,
192 < 0 = no limit */
193 #endif
194
195 #ifndef MAXPERIP
196 #define MAXPERIP -1 /* maximum number of this service
197 from a single remote address,
198 < 0 = no limit */
199 #endif
200
201 #ifndef TOOMANY
202 #define TOOMANY 256 /* don't start more than TOOMANY */
203 #endif
204 #define CNT_INTVL 60 /* servers in CNT_INTVL sec. */
205 #define RETRYTIME (60*10) /* retry after bind or server fail */
206 #define MAX_MAXCHLD 32767 /* max allowable max children */
207
208 #define SIGBLOCK (sigmask(SIGCHLD)|sigmask(SIGHUP)|sigmask(SIGALRM))
209
210 #define satosin(sa) ((struct sockaddr_in *)(void *)sa)
211 #define csatosin(sa) ((const struct sockaddr_in *)(const void *)sa)
212 #ifdef INET6
213 #define satosin6(sa) ((struct sockaddr_in6 *)(void *)sa)
214 #define csatosin6(sa) ((const struct sockaddr_in6 *)(const void *)sa)
215 #endif
216 static void close_sep(struct servtab *);
217 static void flag_signal(int);
218 static void config(void);
219 static int cpmip(const struct servtab *, int);
220 static void endconfig(void);
221 static struct servtab *enter(struct servtab *);
222 static void freeconfig(struct servtab *);
223 static struct servtab *getconfigent(void);
224 static int matchservent(const char *, const char *, const char *);
225 static char *nextline(FILE *);
226 static void addchild(struct servtab *, int);
227 static void reapchild(void);
228 static void enable(struct servtab *);
229 static void disable(struct servtab *);
230 static void retry(void);
231 static int setconfig(void);
232 static void setup(struct servtab *);
233 #ifdef IPSEC
234 static void ipsecsetup(struct servtab *);
235 #endif
236 static void unregisterrpc(register struct servtab *sep);
237 static struct conninfo *search_conn(struct servtab *sep, int ctrl);
238 static int room_conn(struct servtab *sep, struct conninfo *conn);
239 static void addchild_conn(struct conninfo *conn, pid_t pid);
240 static void reapchild_conn(pid_t pid);
241 static void free_conn(struct conninfo *conn);
242 static void resize_conn(struct servtab *sep, int maxperip);
243 static void free_connlist(struct servtab *sep);
244 static void free_proc(struct procinfo *);
245 static struct procinfo *search_proc(pid_t pid, int add);
246 static int hashval(char *p, int len);
247 static char *skip(char **);
248 static char *sskip(char **);
249 static char *newstr(const char *);
250 static void print_service(const char *, const struct servtab *);
251
252 #ifdef LIBWRAP
253 /* tcpd.h */
254 int allow_severity;
255 int deny_severity;
256 #endif
257
258 static int wrap_ex = 0;
259 static int wrap_bi = 0;
260 int debug = 0;
261 static int dolog = 0;
262 static int maxsock; /* highest-numbered descriptor */
263 static fd_set allsock;
264 static int options;
265 static int timingout;
266 static int toomany = TOOMANY;
267 static int maxchild = MAXCHILD;
268 static int maxcpm = MAXCPM;
269 static int maxperip = MAXPERIP;
270 static struct servent *sp;
271 static struct rpcent *rpc;
272 static char *hostname = NULL;
273 static struct sockaddr_in *bind_sa4;
274 static int v4bind_ok = 0;
275 #ifdef INET6
276 static struct sockaddr_in6 *bind_sa6;
277 static int v6bind_ok = 0;
278 #endif
279 static int signalpipe[2];
280 #ifdef SANITY_CHECK
281 static int nsock;
282 #endif
283 static uid_t euid;
284 static gid_t egid;
285 static mode_t mask;
286
287 struct servtab *servtab;
288
289 static const char *CONFIG = _PATH_INETDCONF;
290 static const char *pid_file = _PATH_INETDPID;
291 static struct pidfh *pfh = NULL;
292
293 static struct netconfig *udpconf, *tcpconf, *udp6conf, *tcp6conf;
294
295 static LIST_HEAD(, procinfo) proctable[PERIPSIZE];
296
297 static int
getvalue(const char * arg,int * value,const char * whine)298 getvalue(const char *arg, int *value, const char *whine)
299 {
300 int tmp;
301 char *p;
302
303 tmp = strtol(arg, &p, 0);
304 if (tmp < 0 || *p) {
305 syslog(LOG_ERR, whine, arg);
306 return 1; /* failure */
307 }
308 *value = tmp;
309 return 0; /* success */
310 }
311
312 #ifdef LIBWRAP
313 static sa_family_t
whichaf(struct request_info * req)314 whichaf(struct request_info *req)
315 {
316 struct sockaddr *sa;
317
318 sa = (struct sockaddr *)req->client->sin;
319 if (sa == NULL)
320 return AF_UNSPEC;
321 #ifdef INET6
322 if (sa->sa_family == AF_INET6 &&
323 IN6_IS_ADDR_V4MAPPED(&satosin6(sa)->sin6_addr))
324 return AF_INET;
325 #endif
326 return sa->sa_family;
327 }
328 #endif
329
330 int
main(int argc,char ** argv)331 main(int argc, char **argv)
332 {
333 struct servtab *sep;
334 struct passwd *pwd;
335 struct group *grp;
336 struct sigaction sa, saalrm, sachld, sahup, sapipe;
337 int ch, dofork;
338 pid_t pid;
339 char buf[50];
340 #ifdef LOGIN_CAP
341 login_cap_t *lc = NULL;
342 #endif
343 #ifdef LIBWRAP
344 struct request_info req;
345 int denied;
346 char *service = NULL;
347 #endif
348 struct sockaddr_storage peer;
349 int i;
350 struct addrinfo hints, *res;
351 const char *servname;
352 int error;
353 struct conninfo *conn;
354
355 openlog("inetd", LOG_PID | LOG_NOWAIT | LOG_PERROR, LOG_DAEMON);
356
357 while ((ch = getopt(argc, argv, "dlwWR:a:c:C:p:s:")) != -1)
358 switch(ch) {
359 case 'd':
360 debug = 1;
361 options |= SO_DEBUG;
362 break;
363 case 'l':
364 dolog = 1;
365 break;
366 case 'R':
367 getvalue(optarg, &toomany,
368 "-R %s: bad value for service invocation rate");
369 break;
370 case 'c':
371 getvalue(optarg, &maxchild,
372 "-c %s: bad value for maximum children");
373 break;
374 case 'C':
375 getvalue(optarg, &maxcpm,
376 "-C %s: bad value for maximum children/minute");
377 break;
378 case 'a':
379 hostname = optarg;
380 break;
381 case 'p':
382 pid_file = optarg;
383 break;
384 case 's':
385 getvalue(optarg, &maxperip,
386 "-s %s: bad value for maximum children per source address");
387 break;
388 case 'w':
389 wrap_ex++;
390 break;
391 case 'W':
392 wrap_bi++;
393 break;
394 case '?':
395 default:
396 syslog(LOG_ERR,
397 "usage: inetd [-dlWw] [-a address] [-C rate]"
398 " [-c maximum] [-p filename] [-R rate]"
399 " [-s maximum] [configuration_file]");
400 exit(EX_USAGE);
401 }
402 /*
403 * Initialize Bind Addrs.
404 * When hostname is NULL, wild card bind addrs are obtained from
405 * getaddrinfo(). But getaddrinfo() requires at least one of
406 * hostname or servname is non NULL.
407 * So when hostname is NULL, set dummy value to servname.
408 * Since getaddrinfo() doesn't accept numeric servname, and
409 * we doesn't use ai_socktype of struct addrinfo returned
410 * from getaddrinfo(), we set dummy value to ai_socktype.
411 */
412 servname = (hostname == NULL) ? "0" /* dummy */ : NULL;
413
414 memset(&hints, 0, sizeof(struct addrinfo));
415 hints.ai_flags = AI_PASSIVE;
416 hints.ai_family = AF_UNSPEC;
417 hints.ai_socktype = SOCK_STREAM; /* dummy */
418 error = getaddrinfo(hostname, servname, &hints, &res);
419 if (error != 0) {
420 syslog(LOG_ERR, "-a %s: %s", hostname, gai_strerror(error));
421 if (error == EAI_SYSTEM)
422 syslog(LOG_ERR, "%s", strerror(errno));
423 exit(EX_USAGE);
424 }
425 do {
426 if (res->ai_addr == NULL) {
427 syslog(LOG_ERR, "-a %s: getaddrinfo failed", hostname);
428 exit(EX_USAGE);
429 }
430 switch (res->ai_addr->sa_family) {
431 case AF_INET:
432 if (v4bind_ok)
433 continue;
434 bind_sa4 = satosin(res->ai_addr);
435 /* init port num in case servname is dummy */
436 bind_sa4->sin_port = 0;
437 v4bind_ok = 1;
438 continue;
439 #ifdef INET6
440 case AF_INET6:
441 if (v6bind_ok)
442 continue;
443 bind_sa6 = satosin6(res->ai_addr);
444 /* init port num in case servname is dummy */
445 bind_sa6->sin6_port = 0;
446 v6bind_ok = 1;
447 continue;
448 #endif
449 }
450 if (v4bind_ok
451 #ifdef INET6
452 && v6bind_ok
453 #endif
454 )
455 break;
456 } while ((res = res->ai_next) != NULL);
457 if (!v4bind_ok
458 #ifdef INET6
459 && !v6bind_ok
460 #endif
461 ) {
462 syslog(LOG_ERR, "-a %s: unknown address family", hostname);
463 exit(EX_USAGE);
464 }
465
466 euid = geteuid();
467 egid = getegid();
468 umask(mask = umask(0777));
469
470 argc -= optind;
471 argv += optind;
472
473 if (argc > 0)
474 CONFIG = argv[0];
475 if (access(CONFIG, R_OK) < 0)
476 syslog(LOG_ERR, "Accessing %s: %m, continuing anyway.", CONFIG);
477 if (debug == 0) {
478 pid_t otherpid;
479
480 pfh = pidfile_open(pid_file, 0600, &otherpid);
481 if (pfh == NULL) {
482 if (errno == EEXIST) {
483 syslog(LOG_ERR, "%s already running, pid: %d",
484 getprogname(), otherpid);
485 exit(EX_OSERR);
486 }
487 syslog(LOG_WARNING, "pidfile_open() failed: %m");
488 }
489
490 if (daemon(0, 0) < 0) {
491 syslog(LOG_WARNING, "daemon(0,0) failed: %m");
492 }
493 /* From now on we don't want syslog messages going to stderr. */
494 closelog();
495 openlog("inetd", LOG_PID | LOG_NOWAIT, LOG_DAEMON);
496 /*
497 * In case somebody has started inetd manually, we need to
498 * clear the logname, so that old servers run as root do not
499 * get the user's logname..
500 */
501 if (setlogin("") < 0) {
502 syslog(LOG_WARNING, "cannot clear logname: %m");
503 /* no big deal if it fails.. */
504 }
505 if (pfh != NULL && pidfile_write(pfh) == -1) {
506 syslog(LOG_WARNING, "pidfile_write(): %m");
507 }
508 }
509
510 if (madvise(NULL, 0, MADV_PROTECT) != 0)
511 syslog(LOG_WARNING, "madvise() failed: %s", strerror(errno));
512
513 for (i = 0; i < PERIPSIZE; ++i)
514 LIST_INIT(&proctable[i]);
515
516 if (v4bind_ok) {
517 udpconf = getnetconfigent("udp");
518 tcpconf = getnetconfigent("tcp");
519 if (udpconf == NULL || tcpconf == NULL) {
520 syslog(LOG_ERR, "unknown rpc/udp or rpc/tcp");
521 exit(EX_USAGE);
522 }
523 }
524 #ifdef INET6
525 if (v6bind_ok) {
526 udp6conf = getnetconfigent("udp6");
527 tcp6conf = getnetconfigent("tcp6");
528 if (udp6conf == NULL || tcp6conf == NULL) {
529 syslog(LOG_ERR, "unknown rpc/udp6 or rpc/tcp6");
530 exit(EX_USAGE);
531 }
532 }
533 #endif
534
535 sa = (struct sigaction){
536 .sa_flags = 0,
537 .sa_handler = flag_signal,
538 };
539 sigemptyset(&sa.sa_mask);
540 sigaddset(&sa.sa_mask, SIGALRM);
541 sigaddset(&sa.sa_mask, SIGCHLD);
542 sigaddset(&sa.sa_mask, SIGHUP);
543 sigaction(SIGALRM, &sa, &saalrm);
544 config();
545 sigaction(SIGHUP, &sa, &sahup);
546 sigaction(SIGCHLD, &sa, &sachld);
547 sa.sa_handler = SIG_IGN;
548 sigaction(SIGPIPE, &sa, &sapipe);
549
550 {
551 /* space for daemons to overwrite environment for ps */
552 #define DUMMYSIZE 100
553 char dummy[DUMMYSIZE];
554
555 (void)memset(dummy, 'x', DUMMYSIZE - 1);
556 dummy[DUMMYSIZE - 1] = '\0';
557 (void)setenv("inetd_dummy", dummy, 1);
558 }
559
560 if (pipe2(signalpipe, O_CLOEXEC) != 0) {
561 syslog(LOG_ERR, "pipe: %m");
562 exit(EX_OSERR);
563 }
564 FD_SET(signalpipe[0], &allsock);
565 #ifdef SANITY_CHECK
566 nsock++;
567 #endif
568 maxsock = MAX(MAX(maxsock, signalpipe[0]), signalpipe[1]);
569
570 for (;;) {
571 int n, ctrl;
572 fd_set readable;
573
574 #ifdef SANITY_CHECK
575 if (nsock == 0) {
576 syslog(LOG_ERR, "%s: nsock=0", __func__);
577 exit(EX_SOFTWARE);
578 }
579 #endif
580 readable = allsock;
581 if ((n = select(maxsock + 1, &readable, (fd_set *)0,
582 (fd_set *)0, (struct timeval *)0)) <= 0) {
583 if (n < 0 && errno != EINTR) {
584 syslog(LOG_WARNING, "select: %m");
585 sleep(1);
586 }
587 continue;
588 }
589 /* handle any queued signal flags */
590 if (FD_ISSET(signalpipe[0], &readable)) {
591 int nsig, signo;
592
593 if (ioctl(signalpipe[0], FIONREAD, &nsig) != 0) {
594 syslog(LOG_ERR, "ioctl: %m");
595 exit(EX_OSERR);
596 }
597 nsig /= sizeof(signo);
598 while (--nsig >= 0) {
599 size_t len;
600
601 len = read(signalpipe[0], &signo, sizeof(signo));
602 if (len != sizeof(signo)) {
603 syslog(LOG_ERR, "read: %m");
604 exit(EX_OSERR);
605 }
606 if (debug)
607 warnx("handling signal flag %d", signo);
608 switch (signo) {
609 case SIGALRM:
610 retry();
611 break;
612 case SIGCHLD:
613 reapchild();
614 break;
615 case SIGHUP:
616 config();
617 break;
618 }
619 }
620 }
621 for (sep = servtab; n && sep; sep = sep->se_next)
622 if (sep->se_fd != -1 && FD_ISSET(sep->se_fd, &readable)) {
623 n--;
624 if (debug)
625 warnx("someone wants %s", sep->se_service);
626 dofork = !sep->se_bi || sep->se_bi->bi_fork || ISWRAP(sep);
627 conn = NULL;
628 if (sep->se_accept && sep->se_socktype == SOCK_STREAM) {
629 i = 1;
630 if (ioctl(sep->se_fd, FIONBIO, &i) < 0)
631 syslog(LOG_ERR, "ioctl (FIONBIO, 1): %m");
632 ctrl = accept(sep->se_fd, (struct sockaddr *)0,
633 (socklen_t *)0);
634 if (debug)
635 warnx("accept, ctrl %d", ctrl);
636 if (ctrl < 0) {
637 if (errno != EINTR)
638 syslog(LOG_WARNING,
639 "accept (for %s): %m",
640 sep->se_service);
641 if (sep->se_accept &&
642 sep->se_socktype == SOCK_STREAM)
643 close(ctrl);
644 continue;
645 }
646 i = 0;
647 if (ioctl(sep->se_fd, FIONBIO, &i) < 0)
648 syslog(LOG_ERR, "ioctl1(FIONBIO, 0): %m");
649 if (ioctl(ctrl, FIONBIO, &i) < 0)
650 syslog(LOG_ERR, "ioctl2(FIONBIO, 0): %m");
651 if (cpmip(sep, ctrl) < 0) {
652 close(ctrl);
653 continue;
654 }
655 if (dofork &&
656 (conn = search_conn(sep, ctrl)) != NULL &&
657 !room_conn(sep, conn)) {
658 close(ctrl);
659 continue;
660 }
661 } else
662 ctrl = sep->se_fd;
663 if (dolog && !ISWRAP(sep)) {
664 char pname[NI_MAXHOST] = "unknown";
665 socklen_t sl;
666 sl = sizeof(peer);
667 if (getpeername(ctrl, (struct sockaddr *)
668 &peer, &sl)) {
669 sl = sizeof(peer);
670 if (recvfrom(ctrl, buf, sizeof(buf),
671 MSG_PEEK,
672 (struct sockaddr *)&peer,
673 &sl) >= 0) {
674 getnameinfo((struct sockaddr *)&peer,
675 peer.ss_len,
676 pname, sizeof(pname),
677 NULL, 0, NI_NUMERICHOST);
678 }
679 } else {
680 getnameinfo((struct sockaddr *)&peer,
681 peer.ss_len,
682 pname, sizeof(pname),
683 NULL, 0, NI_NUMERICHOST);
684 }
685 syslog(LOG_INFO,"%s from %s", sep->se_service, pname);
686 }
687 (void) sigblock(SIGBLOCK);
688 pid = 0;
689 /*
690 * Fork for all external services, builtins which need to
691 * fork and anything we're wrapping (as wrapping might
692 * block or use hosts_options(5) twist).
693 */
694 if (dofork) {
695 if (sep->se_count++ == 0)
696 (void)clock_gettime(CLOCK_MONOTONIC_FAST, &sep->se_time);
697 else if (toomany > 0 && sep->se_count >= toomany) {
698 struct timespec now;
699
700 (void)clock_gettime(CLOCK_MONOTONIC_FAST, &now);
701 if (now.tv_sec - sep->se_time.tv_sec >
702 CNT_INTVL) {
703 sep->se_time = now;
704 sep->se_count = 1;
705 } else {
706 syslog(LOG_ERR,
707 "%s/%s server failing (looping), service terminated",
708 sep->se_service, sep->se_proto);
709 if (sep->se_accept &&
710 sep->se_socktype == SOCK_STREAM)
711 close(ctrl);
712 close_sep(sep);
713 free_conn(conn);
714 sigsetmask(0L);
715 if (!timingout) {
716 timingout = 1;
717 alarm(RETRYTIME);
718 }
719 continue;
720 }
721 }
722 pid = fork();
723 }
724 if (pid < 0) {
725 syslog(LOG_ERR, "fork: %m");
726 if (sep->se_accept &&
727 sep->se_socktype == SOCK_STREAM)
728 close(ctrl);
729 free_conn(conn);
730 sigsetmask(0L);
731 sleep(1);
732 continue;
733 }
734 if (pid) {
735 addchild_conn(conn, pid);
736 addchild(sep, pid);
737 }
738 sigsetmask(0L);
739 if (pid == 0) {
740 pidfile_close(pfh);
741 if (dofork) {
742 sigaction(SIGALRM, &saalrm, (struct sigaction *)0);
743 sigaction(SIGCHLD, &sachld, (struct sigaction *)0);
744 sigaction(SIGHUP, &sahup, (struct sigaction *)0);
745 /* SIGPIPE reset before exec */
746 }
747 /*
748 * Call tcpmux to find the real service to exec.
749 */
750 if (sep->se_bi &&
751 sep->se_bi->bi_fn == (bi_fn_t *) tcpmux) {
752 sep = tcpmux(ctrl);
753 if (sep == NULL) {
754 close(ctrl);
755 _exit(0);
756 }
757 }
758 #ifdef LIBWRAP
759 if (ISWRAP(sep)) {
760 inetd_setproctitle("wrapping", ctrl);
761 service = sep->se_server_name ?
762 sep->se_server_name : sep->se_service;
763 request_init(&req, RQ_DAEMON, service, RQ_FILE, ctrl, 0);
764 fromhost(&req);
765 deny_severity = LIBWRAP_DENY_FACILITY|LIBWRAP_DENY_SEVERITY;
766 allow_severity = LIBWRAP_ALLOW_FACILITY|LIBWRAP_ALLOW_SEVERITY;
767 denied = !hosts_access(&req);
768 if (denied) {
769 syslog(deny_severity,
770 "refused connection from %.500s, service %s (%s%s)",
771 eval_client(&req), service, sep->se_proto,
772 (whichaf(&req) == AF_INET6) ? "6" : "");
773 if (sep->se_socktype != SOCK_STREAM)
774 recv(ctrl, buf, sizeof (buf), 0);
775 if (dofork) {
776 sleep(1);
777 _exit(0);
778 }
779 }
780 if (dolog) {
781 syslog(allow_severity,
782 "connection from %.500s, service %s (%s%s)",
783 eval_client(&req), service, sep->se_proto,
784 (whichaf(&req) == AF_INET6) ? "6" : "");
785 }
786 }
787 #endif
788 if (sep->se_bi) {
789 (*sep->se_bi->bi_fn)(ctrl, sep);
790 } else {
791 if (debug)
792 warnx("%d execl %s",
793 getpid(), sep->se_server);
794 /* Clear close-on-exec. */
795 if (fcntl(ctrl, F_SETFD, 0) < 0) {
796 syslog(LOG_ERR,
797 "%s/%s: fcntl (F_SETFD, 0): %m",
798 sep->se_service, sep->se_proto);
799 _exit(EX_OSERR);
800 }
801 if (ctrl != 0) {
802 dup2(ctrl, 0);
803 close(ctrl);
804 }
805 dup2(0, 1);
806 dup2(0, 2);
807 if ((pwd = getpwnam(sep->se_user)) == NULL) {
808 syslog(LOG_ERR,
809 "%s/%s: %s: no such user",
810 sep->se_service, sep->se_proto,
811 sep->se_user);
812 if (sep->se_socktype != SOCK_STREAM)
813 recv(0, buf, sizeof (buf), 0);
814 _exit(EX_NOUSER);
815 }
816 grp = NULL;
817 if ( sep->se_group != NULL
818 && (grp = getgrnam(sep->se_group)) == NULL
819 ) {
820 syslog(LOG_ERR,
821 "%s/%s: %s: no such group",
822 sep->se_service, sep->se_proto,
823 sep->se_group);
824 if (sep->se_socktype != SOCK_STREAM)
825 recv(0, buf, sizeof (buf), 0);
826 _exit(EX_NOUSER);
827 }
828 if (grp != NULL)
829 pwd->pw_gid = grp->gr_gid;
830 #ifdef LOGIN_CAP
831 if ((lc = login_getclass(sep->se_class)) == NULL) {
832 /* error syslogged by getclass */
833 syslog(LOG_ERR,
834 "%s/%s: %s: login class error",
835 sep->se_service, sep->se_proto,
836 sep->se_class);
837 if (sep->se_socktype != SOCK_STREAM)
838 recv(0, buf, sizeof (buf), 0);
839 _exit(EX_NOUSER);
840 }
841 #endif
842 if (setsid() < 0) {
843 syslog(LOG_ERR,
844 "%s: can't setsid(): %m",
845 sep->se_service);
846 /* _exit(EX_OSERR); not fatal yet */
847 }
848 #ifdef LOGIN_CAP
849 if (setusercontext(lc, pwd, pwd->pw_uid,
850 LOGIN_SETALL & ~LOGIN_SETMAC)
851 != 0) {
852 syslog(LOG_ERR,
853 "%s: can't setusercontext(..%s..): %m",
854 sep->se_service, sep->se_user);
855 _exit(EX_OSERR);
856 }
857 login_close(lc);
858 #else
859 if (pwd->pw_uid) {
860 if (setlogin(sep->se_user) < 0) {
861 syslog(LOG_ERR,
862 "%s: can't setlogin(%s): %m",
863 sep->se_service, sep->se_user);
864 /* _exit(EX_OSERR); not yet */
865 }
866 if (setgid(pwd->pw_gid) < 0) {
867 syslog(LOG_ERR,
868 "%s: can't set gid %d: %m",
869 sep->se_service, pwd->pw_gid);
870 _exit(EX_OSERR);
871 }
872 (void) initgroups(pwd->pw_name,
873 pwd->pw_gid);
874 if (setuid(pwd->pw_uid) < 0) {
875 syslog(LOG_ERR,
876 "%s: can't set uid %d: %m",
877 sep->se_service, pwd->pw_uid);
878 _exit(EX_OSERR);
879 }
880 }
881 #endif
882 sigaction(SIGPIPE, &sapipe,
883 (struct sigaction *)0);
884 execv(sep->se_server, sep->se_argv);
885 syslog(LOG_ERR,
886 "cannot execute %s: %m", sep->se_server);
887 if (sep->se_socktype != SOCK_STREAM)
888 recv(0, buf, sizeof (buf), 0);
889 }
890 if (dofork)
891 _exit(0);
892 }
893 if (sep->se_accept && sep->se_socktype == SOCK_STREAM)
894 close(ctrl);
895 }
896 }
897 }
898
899 /*
900 * Add a signal flag to the signal flag queue for later handling
901 */
902
903 static void
flag_signal(int signo)904 flag_signal(int signo)
905 {
906 size_t len;
907
908 len = write(signalpipe[1], &signo, sizeof(signo));
909 if (len != sizeof(signo)) {
910 syslog(LOG_ERR, "write: %m");
911 _exit(EX_OSERR);
912 }
913 }
914
915 /*
916 * Record a new child pid for this service. If we've reached the
917 * limit on children, then stop accepting incoming requests.
918 */
919
920 static void
addchild(struct servtab * sep,pid_t pid)921 addchild(struct servtab *sep, pid_t pid)
922 {
923 struct stabchild *sc;
924
925 #ifdef SANITY_CHECK
926 if (SERVTAB_EXCEEDS_LIMIT(sep)) {
927 syslog(LOG_ERR, "%s: %d >= %d",
928 __func__, sep->se_numchild, sep->se_maxchild);
929 exit(EX_SOFTWARE);
930 }
931 #endif
932 sc = calloc(1, sizeof(*sc));
933 if (sc == NULL) {
934 syslog(LOG_ERR, "calloc: %m");
935 exit(EX_OSERR);
936 }
937 sc->sc_pid = pid;
938 LIST_INSERT_HEAD(&sep->se_children, sc, sc_link);
939 ++sep->se_numchild;
940 if (SERVTAB_AT_LIMIT(sep))
941 disable(sep);
942 }
943
944 static void
reapchild(void)945 reapchild(void)
946 {
947 int status;
948 pid_t pid;
949 struct stabchild *sc;
950 struct servtab *sep;
951
952 for (;;) {
953 pid = wait3(&status, WNOHANG, (struct rusage *)0);
954 if (pid <= 0)
955 break;
956 if (debug)
957 warnx("%d reaped, %s %u", pid,
958 WIFEXITED(status) ? "status" : "signal",
959 WIFEXITED(status) ? WEXITSTATUS(status)
960 : WTERMSIG(status));
961 for (sep = servtab; sep; sep = sep->se_next) {
962 LIST_FOREACH(sc, &sep->se_children, sc_link) {
963 if (sc->sc_pid == pid)
964 break;
965 }
966 if (sc == NULL)
967 continue;
968 if (SERVTAB_AT_LIMIT(sep))
969 enable(sep);
970 LIST_REMOVE(sc, sc_link);
971 free(sc);
972 --sep->se_numchild;
973 if (WIFSIGNALED(status) || WEXITSTATUS(status))
974 syslog(LOG_WARNING,
975 "%s[%d]: exited, %s %u",
976 sep->se_server, pid,
977 WIFEXITED(status) ? "status" : "signal",
978 WIFEXITED(status) ? WEXITSTATUS(status)
979 : WTERMSIG(status));
980 break;
981 }
982 reapchild_conn(pid);
983 }
984 }
985
986 static void
config(void)987 config(void)
988 {
989 struct servtab *sep, *new, **sepp;
990 long omask;
991 int new_nomapped;
992 #ifdef LOGIN_CAP
993 login_cap_t *lc = NULL;
994 #endif
995
996 if (!setconfig()) {
997 syslog(LOG_ERR, "%s: %m", CONFIG);
998 return;
999 }
1000 for (sep = servtab; sep; sep = sep->se_next)
1001 sep->se_checked = 0;
1002 while ((new = getconfigent())) {
1003 if (getpwnam(new->se_user) == NULL) {
1004 syslog(LOG_ERR,
1005 "%s/%s: no such user '%s', service ignored",
1006 new->se_service, new->se_proto, new->se_user);
1007 continue;
1008 }
1009 if (new->se_group && getgrnam(new->se_group) == NULL) {
1010 syslog(LOG_ERR,
1011 "%s/%s: no such group '%s', service ignored",
1012 new->se_service, new->se_proto, new->se_group);
1013 continue;
1014 }
1015 #ifdef LOGIN_CAP
1016 if ((lc = login_getclass(new->se_class)) == NULL) {
1017 /* error syslogged by getclass */
1018 syslog(LOG_ERR,
1019 "%s/%s: %s: login class error, service ignored",
1020 new->se_service, new->se_proto, new->se_class);
1021 continue;
1022 }
1023 login_close(lc);
1024 #endif
1025 new_nomapped = new->se_nomapped;
1026 for (sep = servtab; sep; sep = sep->se_next)
1027 if (strcmp(sep->se_service, new->se_service) == 0 &&
1028 strcmp(sep->se_proto, new->se_proto) == 0 &&
1029 sep->se_rpc == new->se_rpc &&
1030 sep->se_socktype == new->se_socktype &&
1031 sep->se_family == new->se_family)
1032 break;
1033 if (sep != 0) {
1034 int i;
1035
1036 #define SWAP(t,a, b) { t c = a; a = b; b = c; }
1037 omask = sigblock(SIGBLOCK);
1038 if (sep->se_nomapped != new->se_nomapped) {
1039 /* for rpc keep old nommaped till unregister */
1040 if (!sep->se_rpc)
1041 sep->se_nomapped = new->se_nomapped;
1042 sep->se_reset = 1;
1043 }
1044
1045 /*
1046 * The children tracked remain; we want numchild to
1047 * still reflect how many jobs are running so we don't
1048 * throw off our accounting.
1049 */
1050 sep->se_maxcpm = new->se_maxcpm;
1051 sep->se_maxchild = new->se_maxchild;
1052 resize_conn(sep, new->se_maxperip);
1053 sep->se_maxperip = new->se_maxperip;
1054 sep->se_bi = new->se_bi;
1055 /* might need to turn on or off service now */
1056 if (sep->se_fd >= 0) {
1057 if (SERVTAB_EXCEEDS_LIMIT(sep)) {
1058 if (FD_ISSET(sep->se_fd, &allsock))
1059 disable(sep);
1060 } else {
1061 if (!FD_ISSET(sep->se_fd, &allsock))
1062 enable(sep);
1063 }
1064 }
1065 sep->se_accept = new->se_accept;
1066 SWAP(char *, sep->se_user, new->se_user);
1067 SWAP(char *, sep->se_group, new->se_group);
1068 #ifdef LOGIN_CAP
1069 SWAP(char *, sep->se_class, new->se_class);
1070 #endif
1071 SWAP(char *, sep->se_server, new->se_server);
1072 SWAP(char *, sep->se_server_name, new->se_server_name);
1073 for (i = 0; i < MAXARGV; i++)
1074 SWAP(char *, sep->se_argv[i], new->se_argv[i]);
1075 #ifdef IPSEC
1076 SWAP(char *, sep->se_policy, new->se_policy);
1077 ipsecsetup(sep);
1078 #endif
1079 sigsetmask(omask);
1080 freeconfig(new);
1081 if (debug)
1082 print_service("REDO", sep);
1083 } else {
1084 sep = enter(new);
1085 if (debug)
1086 print_service("ADD ", sep);
1087 }
1088 sep->se_checked = 1;
1089 if (ISMUX(sep)) {
1090 sep->se_fd = -1;
1091 continue;
1092 }
1093 switch (sep->se_family) {
1094 case AF_INET:
1095 if (!v4bind_ok) {
1096 sep->se_fd = -1;
1097 continue;
1098 }
1099 break;
1100 #ifdef INET6
1101 case AF_INET6:
1102 if (!v6bind_ok) {
1103 sep->se_fd = -1;
1104 continue;
1105 }
1106 break;
1107 #endif
1108 }
1109 if (!sep->se_rpc) {
1110 if (sep->se_family != AF_UNIX) {
1111 sp = getservbyname(sep->se_service, sep->se_proto);
1112 if (sp == 0) {
1113 syslog(LOG_ERR, "%s/%s: unknown service",
1114 sep->se_service, sep->se_proto);
1115 sep->se_checked = 0;
1116 continue;
1117 }
1118 }
1119 switch (sep->se_family) {
1120 case AF_INET:
1121 if (sp->s_port != sep->se_ctrladdr4.sin_port) {
1122 sep->se_ctrladdr4.sin_port =
1123 sp->s_port;
1124 sep->se_reset = 1;
1125 }
1126 break;
1127 #ifdef INET6
1128 case AF_INET6:
1129 if (sp->s_port !=
1130 sep->se_ctrladdr6.sin6_port) {
1131 sep->se_ctrladdr6.sin6_port =
1132 sp->s_port;
1133 sep->se_reset = 1;
1134 }
1135 break;
1136 #endif
1137 }
1138 if (sep->se_reset != 0 && sep->se_fd >= 0)
1139 close_sep(sep);
1140 } else {
1141 rpc = getrpcbyname(sep->se_service);
1142 if (rpc == 0) {
1143 syslog(LOG_ERR, "%s/%s unknown RPC service",
1144 sep->se_service, sep->se_proto);
1145 if (sep->se_fd != -1)
1146 (void) close(sep->se_fd);
1147 sep->se_fd = -1;
1148 continue;
1149 }
1150 if (sep->se_reset != 0 ||
1151 rpc->r_number != sep->se_rpc_prog) {
1152 if (sep->se_rpc_prog)
1153 unregisterrpc(sep);
1154 sep->se_rpc_prog = rpc->r_number;
1155 if (sep->se_fd != -1)
1156 (void) close(sep->se_fd);
1157 sep->se_fd = -1;
1158 }
1159 sep->se_nomapped = new_nomapped;
1160 }
1161 sep->se_reset = 0;
1162 if (sep->se_fd == -1)
1163 setup(sep);
1164 }
1165 endconfig();
1166 /*
1167 * Purge anything not looked at above.
1168 */
1169 omask = sigblock(SIGBLOCK);
1170 sepp = &servtab;
1171 while ((sep = *sepp)) {
1172 if (sep->se_checked) {
1173 sepp = &sep->se_next;
1174 continue;
1175 }
1176 *sepp = sep->se_next;
1177 if (sep->se_fd >= 0)
1178 close_sep(sep);
1179 if (debug)
1180 print_service("FREE", sep);
1181 if (sep->se_rpc && sep->se_rpc_prog > 0)
1182 unregisterrpc(sep);
1183 freeconfig(sep);
1184 free(sep);
1185 }
1186 (void) sigsetmask(omask);
1187 }
1188
1189 static void
unregisterrpc(struct servtab * sep)1190 unregisterrpc(struct servtab *sep)
1191 {
1192 u_int i;
1193 struct servtab *sepp;
1194 long omask;
1195 struct netconfig *netid4, *netid6;
1196
1197 omask = sigblock(SIGBLOCK);
1198 netid4 = sep->se_socktype == SOCK_DGRAM ? udpconf : tcpconf;
1199 netid6 = sep->se_socktype == SOCK_DGRAM ? udp6conf : tcp6conf;
1200 if (sep->se_family == AF_INET)
1201 netid6 = NULL;
1202 else if (sep->se_nomapped)
1203 netid4 = NULL;
1204 /*
1205 * Conflict if same prog and protocol - In that case one should look
1206 * to versions, but it is not interesting: having separate servers for
1207 * different versions does not work well.
1208 * Therefore one do not unregister if there is a conflict.
1209 * There is also transport conflict if destroying INET when INET46
1210 * exists, or destroying INET46 when INET exists
1211 */
1212 for (sepp = servtab; sepp; sepp = sepp->se_next) {
1213 if (sepp == sep)
1214 continue;
1215 if (sepp->se_checked == 0 ||
1216 !sepp->se_rpc ||
1217 strcmp(sep->se_proto, sepp->se_proto) != 0 ||
1218 sep->se_rpc_prog != sepp->se_rpc_prog)
1219 continue;
1220 if (sepp->se_family == AF_INET)
1221 netid4 = NULL;
1222 if (sepp->se_family == AF_INET6) {
1223 netid6 = NULL;
1224 if (!sep->se_nomapped)
1225 netid4 = NULL;
1226 }
1227 if (netid4 == NULL && netid6 == NULL)
1228 return;
1229 }
1230 if (debug)
1231 print_service("UNREG", sep);
1232 for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++) {
1233 if (netid4)
1234 rpcb_unset(sep->se_rpc_prog, i, netid4);
1235 if (netid6)
1236 rpcb_unset(sep->se_rpc_prog, i, netid6);
1237 }
1238 if (sep->se_fd != -1)
1239 (void) close(sep->se_fd);
1240 sep->se_fd = -1;
1241 (void) sigsetmask(omask);
1242 }
1243
1244 static void
retry(void)1245 retry(void)
1246 {
1247 struct servtab *sep;
1248
1249 timingout = 0;
1250 for (sep = servtab; sep; sep = sep->se_next)
1251 if (sep->se_fd == -1 && !ISMUX(sep))
1252 setup(sep);
1253 }
1254
1255 static void
setup(struct servtab * sep)1256 setup(struct servtab *sep)
1257 {
1258 int on = 1;
1259
1260 /* Set all listening sockets to close-on-exec. */
1261 if ((sep->se_fd = socket(sep->se_family,
1262 sep->se_socktype | SOCK_CLOEXEC, 0)) < 0) {
1263 if (debug)
1264 warn("socket failed on %s/%s",
1265 sep->se_service, sep->se_proto);
1266 syslog(LOG_ERR, "%s/%s: socket: %m",
1267 sep->se_service, sep->se_proto);
1268 return;
1269 }
1270 #define turnon(fd, opt) \
1271 setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on))
1272 if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) &&
1273 turnon(sep->se_fd, SO_DEBUG) < 0)
1274 syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m");
1275 if (turnon(sep->se_fd, SO_REUSEADDR) < 0)
1276 syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m");
1277 #ifdef SO_PRIVSTATE
1278 if (turnon(sep->se_fd, SO_PRIVSTATE) < 0)
1279 syslog(LOG_ERR, "setsockopt (SO_PRIVSTATE): %m");
1280 #endif
1281 /* tftpd opens a new connection then needs more infos */
1282 #ifdef INET6
1283 if ((sep->se_family == AF_INET6) &&
1284 (strcmp(sep->se_proto, "udp") == 0) &&
1285 (sep->se_accept == 0) &&
1286 (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_RECVPKTINFO,
1287 (char *)&on, sizeof (on)) < 0))
1288 syslog(LOG_ERR, "setsockopt (IPV6_RECVPKTINFO): %m");
1289 if (sep->se_family == AF_INET6) {
1290 int flag = sep->se_nomapped ? 1 : 0;
1291 if (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_V6ONLY,
1292 (char *)&flag, sizeof (flag)) < 0)
1293 syslog(LOG_ERR, "setsockopt (IPV6_V6ONLY): %m");
1294 }
1295 #endif
1296 #undef turnon
1297 #ifdef IPSEC
1298 ipsecsetup(sep);
1299 #endif
1300 if (sep->se_family == AF_UNIX) {
1301 (void) unlink(sep->se_ctrladdr_un.sun_path);
1302 umask(0777); /* Make socket with conservative permissions */
1303 }
1304 if (bind(sep->se_fd, (struct sockaddr *)&sep->se_ctrladdr,
1305 sep->se_ctrladdr_size) < 0) {
1306 if (debug)
1307 warn("bind failed on %s/%s",
1308 sep->se_service, sep->se_proto);
1309 syslog(LOG_ERR, "%s/%s: bind: %m",
1310 sep->se_service, sep->se_proto);
1311 (void) close(sep->se_fd);
1312 sep->se_fd = -1;
1313 if (!timingout) {
1314 timingout = 1;
1315 alarm(RETRYTIME);
1316 }
1317 if (sep->se_family == AF_UNIX)
1318 umask(mask);
1319 return;
1320 }
1321 if (sep->se_family == AF_UNIX) {
1322 /* Ick - fch{own,mod} don't work on Unix domain sockets */
1323 if (chown(sep->se_service, sep->se_sockuid, sep->se_sockgid) < 0)
1324 syslog(LOG_ERR, "chown socket: %m");
1325 if (chmod(sep->se_service, sep->se_sockmode) < 0)
1326 syslog(LOG_ERR, "chmod socket: %m");
1327 umask(mask);
1328 }
1329 if (sep->se_rpc) {
1330 u_int i;
1331 socklen_t len = sep->se_ctrladdr_size;
1332 struct netconfig *netid, *netid2 = NULL;
1333 #ifdef INET6
1334 struct sockaddr_in sock;
1335 #endif
1336 struct netbuf nbuf, nbuf2;
1337
1338 if (getsockname(sep->se_fd,
1339 (struct sockaddr*)&sep->se_ctrladdr, &len) < 0){
1340 syslog(LOG_ERR, "%s/%s: getsockname: %m",
1341 sep->se_service, sep->se_proto);
1342 (void) close(sep->se_fd);
1343 sep->se_fd = -1;
1344 return;
1345 }
1346 nbuf.buf = &sep->se_ctrladdr;
1347 nbuf.len = sep->se_ctrladdr.sa_len;
1348 if (sep->se_family == AF_INET)
1349 netid = sep->se_socktype==SOCK_DGRAM? udpconf:tcpconf;
1350 #ifdef INET6
1351 else {
1352 netid = sep->se_socktype==SOCK_DGRAM? udp6conf:tcp6conf;
1353 if (!sep->se_nomapped) { /* INET and INET6 */
1354 netid2 = netid==udp6conf? udpconf:tcpconf;
1355 memset(&sock, 0, sizeof sock); /* ADDR_ANY */
1356 nbuf2.buf = &sock;
1357 nbuf2.len = sock.sin_len = sizeof sock;
1358 sock.sin_family = AF_INET;
1359 sock.sin_port = sep->se_ctrladdr6.sin6_port;
1360 }
1361 }
1362 #else
1363 else {
1364 syslog(LOG_ERR,
1365 "%s/%s: inetd compiled without inet6 support\n",
1366 sep->se_service, sep->se_proto);
1367 (void) close(sep->se_fd);
1368 sep->se_fd = -1;
1369 return;
1370 }
1371 #endif
1372 if (debug)
1373 print_service("REG ", sep);
1374 for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++) {
1375 rpcb_unset(sep->se_rpc_prog, i, netid);
1376 rpcb_set(sep->se_rpc_prog, i, netid, &nbuf);
1377 if (netid2) {
1378 rpcb_unset(sep->se_rpc_prog, i, netid2);
1379 rpcb_set(sep->se_rpc_prog, i, netid2, &nbuf2);
1380 }
1381 }
1382 }
1383 if (sep->se_socktype == SOCK_STREAM)
1384 listen(sep->se_fd, -1);
1385 enable(sep);
1386 if (debug) {
1387 warnx("registered %s on %d",
1388 sep->se_server, sep->se_fd);
1389 }
1390 }
1391
1392 #ifdef IPSEC
1393 static void
ipsecsetup(struct servtab * sep)1394 ipsecsetup(struct servtab *sep)
1395 {
1396 char *buf;
1397 char *policy_in = NULL;
1398 char *policy_out = NULL;
1399 int level;
1400 int opt;
1401
1402 switch (sep->se_family) {
1403 case AF_INET:
1404 level = IPPROTO_IP;
1405 opt = IP_IPSEC_POLICY;
1406 break;
1407 #ifdef INET6
1408 case AF_INET6:
1409 level = IPPROTO_IPV6;
1410 opt = IPV6_IPSEC_POLICY;
1411 break;
1412 #endif
1413 default:
1414 return;
1415 }
1416
1417 if (!sep->se_policy || sep->se_policy[0] == '\0') {
1418 static char def_in[] = "in entrust", def_out[] = "out entrust";
1419 policy_in = def_in;
1420 policy_out = def_out;
1421 } else {
1422 if (!strncmp("in", sep->se_policy, 2))
1423 policy_in = sep->se_policy;
1424 else if (!strncmp("out", sep->se_policy, 3))
1425 policy_out = sep->se_policy;
1426 else {
1427 syslog(LOG_ERR, "invalid security policy \"%s\"",
1428 sep->se_policy);
1429 return;
1430 }
1431 }
1432
1433 if (policy_in != NULL) {
1434 buf = ipsec_set_policy(policy_in, strlen(policy_in));
1435 if (buf != NULL) {
1436 if (setsockopt(sep->se_fd, level, opt,
1437 buf, ipsec_get_policylen(buf)) < 0 &&
1438 debug != 0)
1439 warnx("%s/%s: ipsec initialization failed; %s",
1440 sep->se_service, sep->se_proto,
1441 policy_in);
1442 free(buf);
1443 } else
1444 syslog(LOG_ERR, "invalid security policy \"%s\"",
1445 policy_in);
1446 }
1447 if (policy_out != NULL) {
1448 buf = ipsec_set_policy(policy_out, strlen(policy_out));
1449 if (buf != NULL) {
1450 if (setsockopt(sep->se_fd, level, opt,
1451 buf, ipsec_get_policylen(buf)) < 0 &&
1452 debug != 0)
1453 warnx("%s/%s: ipsec initialization failed; %s",
1454 sep->se_service, sep->se_proto,
1455 policy_out);
1456 free(buf);
1457 } else
1458 syslog(LOG_ERR, "invalid security policy \"%s\"",
1459 policy_out);
1460 }
1461 }
1462 #endif
1463
1464 /*
1465 * Finish with a service and its socket.
1466 */
1467 static void
close_sep(struct servtab * sep)1468 close_sep(struct servtab *sep)
1469 {
1470 if (sep->se_fd >= 0) {
1471 if (FD_ISSET(sep->se_fd, &allsock))
1472 disable(sep);
1473 (void) close(sep->se_fd);
1474 sep->se_fd = -1;
1475 }
1476 sep->se_count = 0;
1477 sep->se_numchild = 0; /* forget about any existing children */
1478 }
1479
1480 static int
matchservent(const char * name1,const char * name2,const char * proto)1481 matchservent(const char *name1, const char *name2, const char *proto)
1482 {
1483 char **alias, *p;
1484 struct servent *se;
1485
1486 if (strcmp(proto, "unix") == 0) {
1487 if ((p = strrchr(name1, '/')) != NULL)
1488 name1 = p + 1;
1489 if ((p = strrchr(name2, '/')) != NULL)
1490 name2 = p + 1;
1491 }
1492 if (strcmp(name1, name2) == 0)
1493 return(1);
1494 if ((se = getservbyname(name1, proto)) != NULL) {
1495 if (strcmp(name2, se->s_name) == 0)
1496 return(1);
1497 for (alias = se->s_aliases; *alias; alias++)
1498 if (strcmp(name2, *alias) == 0)
1499 return(1);
1500 }
1501 return(0);
1502 }
1503
1504 static struct servtab *
enter(struct servtab * cp)1505 enter(struct servtab *cp)
1506 {
1507 struct servtab *sep;
1508 long omask;
1509
1510 sep = malloc(sizeof(*sep));
1511 if (sep == NULL) {
1512 syslog(LOG_ERR, "malloc: %m");
1513 exit(EX_OSERR);
1514 }
1515 *sep = *cp;
1516 sep->se_fd = -1;
1517 omask = sigblock(SIGBLOCK);
1518 sep->se_next = servtab;
1519 servtab = sep;
1520 sigsetmask(omask);
1521 return (sep);
1522 }
1523
1524 static void
enable(struct servtab * sep)1525 enable(struct servtab *sep)
1526 {
1527 if (debug)
1528 warnx(
1529 "enabling %s, fd %d", sep->se_service, sep->se_fd);
1530 #ifdef SANITY_CHECK
1531 if (sep->se_fd < 0) {
1532 syslog(LOG_ERR,
1533 "%s: %s: bad fd", __func__, sep->se_service);
1534 exit(EX_SOFTWARE);
1535 }
1536 if (ISMUX(sep)) {
1537 syslog(LOG_ERR,
1538 "%s: %s: is mux", __func__, sep->se_service);
1539 exit(EX_SOFTWARE);
1540 }
1541 if (FD_ISSET(sep->se_fd, &allsock)) {
1542 syslog(LOG_ERR,
1543 "%s: %s: not off", __func__, sep->se_service);
1544 exit(EX_SOFTWARE);
1545 }
1546 nsock++;
1547 #endif
1548 FD_SET(sep->se_fd, &allsock);
1549 maxsock = MAX(maxsock, sep->se_fd);
1550 }
1551
1552 static void
disable(struct servtab * sep)1553 disable(struct servtab *sep)
1554 {
1555 if (debug)
1556 warnx(
1557 "disabling %s, fd %d", sep->se_service, sep->se_fd);
1558 #ifdef SANITY_CHECK
1559 if (sep->se_fd < 0) {
1560 syslog(LOG_ERR,
1561 "%s: %s: bad fd", __func__, sep->se_service);
1562 exit(EX_SOFTWARE);
1563 }
1564 if (ISMUX(sep)) {
1565 syslog(LOG_ERR,
1566 "%s: %s: is mux", __func__, sep->se_service);
1567 exit(EX_SOFTWARE);
1568 }
1569 if (!FD_ISSET(sep->se_fd, &allsock)) {
1570 syslog(LOG_ERR,
1571 "%s: %s: not on", __func__, sep->se_service);
1572 exit(EX_SOFTWARE);
1573 }
1574 if (nsock == 0) {
1575 syslog(LOG_ERR, "%s: nsock=0", __func__);
1576 exit(EX_SOFTWARE);
1577 }
1578 nsock--;
1579 #endif
1580 FD_CLR(sep->se_fd, &allsock);
1581 if (sep->se_fd == maxsock)
1582 maxsock--;
1583 }
1584
1585 static FILE *fconfig = NULL;
1586 static struct servtab serv;
1587 static char line[LINE_MAX];
1588
1589 static int
setconfig(void)1590 setconfig(void)
1591 {
1592
1593 if (fconfig != NULL) {
1594 fseek(fconfig, 0L, SEEK_SET);
1595 return (1);
1596 }
1597 fconfig = fopen(CONFIG, "r");
1598 return (fconfig != NULL);
1599 }
1600
1601 static void
endconfig(void)1602 endconfig(void)
1603 {
1604 if (fconfig) {
1605 (void) fclose(fconfig);
1606 fconfig = NULL;
1607 }
1608 }
1609
1610 static struct servtab *
getconfigent(void)1611 getconfigent(void)
1612 {
1613 struct servtab *sep = &serv;
1614 int argc;
1615 char *cp, *arg, *s;
1616 char *versp;
1617 static char TCPMUX_TOKEN[] = "tcpmux/";
1618 #define MUX_LEN (sizeof(TCPMUX_TOKEN)-1)
1619 #ifdef IPSEC
1620 char *policy;
1621 #endif
1622 #ifdef INET6
1623 int v4bind;
1624 int v6bind;
1625 #endif
1626 int i;
1627
1628 #ifdef IPSEC
1629 policy = NULL;
1630 #endif
1631 more:
1632 #ifdef INET6
1633 v4bind = 0;
1634 v6bind = 0;
1635 #endif
1636 while ((cp = nextline(fconfig)) != NULL) {
1637 #ifdef IPSEC
1638 /* lines starting with #@ is not a comment, but the policy */
1639 if (cp[0] == '#' && cp[1] == '@') {
1640 char *p;
1641 for (p = cp + 2; p && *p && isspace(*p); p++)
1642 ;
1643 if (*p == '\0') {
1644 free(policy);
1645 policy = NULL;
1646 } else if (ipsec_get_policylen(p) >= 0) {
1647 free(policy);
1648 policy = newstr(p);
1649 } else {
1650 syslog(LOG_ERR,
1651 "%s: invalid ipsec policy \"%s\"",
1652 CONFIG, p);
1653 exit(EX_CONFIG);
1654 }
1655 }
1656 #endif
1657 if (*cp == '#' || *cp == '\0')
1658 continue;
1659 break;
1660 }
1661 if (cp == NULL) {
1662 #ifdef IPSEC
1663 free(policy);
1664 #endif
1665 return (NULL);
1666 }
1667
1668 /*
1669 * clear the static buffer, since some fields (se_ctrladdr,
1670 * for example) don't get initialized here.
1671 */
1672 memset(sep, 0, sizeof *sep);
1673 arg = skip(&cp);
1674 if (cp == NULL) {
1675 /* got an empty line containing just blanks/tabs. */
1676 goto more;
1677 }
1678 if (arg[0] == ':') { /* :user:group:perm: */
1679 char *user, *group, *perm;
1680 struct passwd *pw;
1681 struct group *gr;
1682 user = arg+1;
1683 if ((group = strchr(user, ':')) == NULL) {
1684 syslog(LOG_ERR, "no group after user '%s'", user);
1685 goto more;
1686 }
1687 *group++ = '\0';
1688 if ((perm = strchr(group, ':')) == NULL) {
1689 syslog(LOG_ERR, "no mode after group '%s'", group);
1690 goto more;
1691 }
1692 *perm++ = '\0';
1693 if ((pw = getpwnam(user)) == NULL) {
1694 syslog(LOG_ERR, "no such user '%s'", user);
1695 goto more;
1696 }
1697 sep->se_sockuid = pw->pw_uid;
1698 if ((gr = getgrnam(group)) == NULL) {
1699 syslog(LOG_ERR, "no such user '%s'", group);
1700 goto more;
1701 }
1702 sep->se_sockgid = gr->gr_gid;
1703 sep->se_sockmode = strtol(perm, &arg, 8);
1704 if (*arg != ':') {
1705 syslog(LOG_ERR, "bad mode '%s'", perm);
1706 goto more;
1707 }
1708 *arg++ = '\0';
1709 } else {
1710 sep->se_sockuid = euid;
1711 sep->se_sockgid = egid;
1712 sep->se_sockmode = 0200;
1713 }
1714 if (strncmp(arg, TCPMUX_TOKEN, MUX_LEN) == 0) {
1715 char *c = arg + MUX_LEN;
1716 if (*c == '+') {
1717 sep->se_type = MUXPLUS_TYPE;
1718 c++;
1719 } else
1720 sep->se_type = MUX_TYPE;
1721 sep->se_service = newstr(c);
1722 } else {
1723 sep->se_service = newstr(arg);
1724 sep->se_type = NORM_TYPE;
1725 }
1726 arg = sskip(&cp);
1727 if (strcmp(arg, "stream") == 0)
1728 sep->se_socktype = SOCK_STREAM;
1729 else if (strcmp(arg, "dgram") == 0)
1730 sep->se_socktype = SOCK_DGRAM;
1731 else if (strcmp(arg, "rdm") == 0)
1732 sep->se_socktype = SOCK_RDM;
1733 else if (strcmp(arg, "seqpacket") == 0)
1734 sep->se_socktype = SOCK_SEQPACKET;
1735 else if (strcmp(arg, "raw") == 0)
1736 sep->se_socktype = SOCK_RAW;
1737 else
1738 sep->se_socktype = -1;
1739
1740 arg = sskip(&cp);
1741 if (strncmp(arg, "tcp", 3) == 0) {
1742 sep->se_proto = newstr(strsep(&arg, "/"));
1743 if (arg != NULL && (strcmp(arg, "faith") == 0)) {
1744 syslog(LOG_ERR, "faith has been deprecated");
1745 goto more;
1746 }
1747 } else {
1748 if (sep->se_type == NORM_TYPE &&
1749 strncmp(arg, "faith/", 6) == 0) {
1750 syslog(LOG_ERR, "faith has been deprecated");
1751 goto more;
1752 }
1753 sep->se_proto = newstr(arg);
1754 }
1755 if (strncmp(sep->se_proto, "rpc/", 4) == 0) {
1756 memmove(sep->se_proto, sep->se_proto + 4,
1757 strlen(sep->se_proto) + 1 - 4);
1758 sep->se_rpc = 1;
1759 sep->se_rpc_prog = sep->se_rpc_lowvers =
1760 sep->se_rpc_highvers = 0;
1761 if ((versp = strrchr(sep->se_service, '/'))) {
1762 *versp++ = '\0';
1763 switch (sscanf(versp, "%u-%u",
1764 &sep->se_rpc_lowvers,
1765 &sep->se_rpc_highvers)) {
1766 case 2:
1767 break;
1768 case 1:
1769 sep->se_rpc_highvers =
1770 sep->se_rpc_lowvers;
1771 break;
1772 default:
1773 syslog(LOG_ERR,
1774 "bad RPC version specifier; %s",
1775 sep->se_service);
1776 freeconfig(sep);
1777 goto more;
1778 }
1779 }
1780 else {
1781 sep->se_rpc_lowvers =
1782 sep->se_rpc_highvers = 1;
1783 }
1784 }
1785 sep->se_nomapped = 0;
1786 if (strcmp(sep->se_proto, "unix") == 0) {
1787 sep->se_family = AF_UNIX;
1788 } else {
1789 while (isdigit(sep->se_proto[strlen(sep->se_proto) - 1])) {
1790 #ifdef INET6
1791 if (sep->se_proto[strlen(sep->se_proto) - 1] == '6') {
1792 sep->se_proto[strlen(sep->se_proto) - 1] = '\0';
1793 v6bind = 1;
1794 continue;
1795 }
1796 #endif
1797 if (sep->se_proto[strlen(sep->se_proto) - 1] == '4') {
1798 sep->se_proto[strlen(sep->se_proto) - 1] = '\0';
1799 #ifdef INET6
1800 v4bind = 1;
1801 #endif
1802 continue;
1803 }
1804 /* illegal version num */
1805 syslog(LOG_ERR, "bad IP version for %s", sep->se_proto);
1806 freeconfig(sep);
1807 goto more;
1808 }
1809 #ifdef INET6
1810 if (v6bind && !v6bind_ok) {
1811 syslog(LOG_INFO, "IPv6 bind is ignored for %s",
1812 sep->se_service);
1813 if (v4bind && v4bind_ok)
1814 v6bind = 0;
1815 else {
1816 freeconfig(sep);
1817 goto more;
1818 }
1819 }
1820 if (v6bind) {
1821 sep->se_family = AF_INET6;
1822 if (!v4bind || !v4bind_ok)
1823 sep->se_nomapped = 1;
1824 } else
1825 #endif
1826 { /* default to v4 bind if not v6 bind */
1827 if (!v4bind_ok) {
1828 syslog(LOG_NOTICE, "IPv4 bind is ignored for %s",
1829 sep->se_service);
1830 freeconfig(sep);
1831 goto more;
1832 }
1833 sep->se_family = AF_INET;
1834 }
1835 }
1836 /* init ctladdr */
1837 switch(sep->se_family) {
1838 case AF_INET:
1839 memcpy(&sep->se_ctrladdr4, bind_sa4,
1840 sizeof(sep->se_ctrladdr4));
1841 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr4);
1842 break;
1843 #ifdef INET6
1844 case AF_INET6:
1845 memcpy(&sep->se_ctrladdr6, bind_sa6,
1846 sizeof(sep->se_ctrladdr6));
1847 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr6);
1848 break;
1849 #endif
1850 case AF_UNIX:
1851 #define SUN_PATH_MAXSIZE sizeof(sep->se_ctrladdr_un.sun_path)
1852 memset(&sep->se_ctrladdr, 0, sizeof(sep->se_ctrladdr));
1853 sep->se_ctrladdr_un.sun_family = sep->se_family;
1854 if (strlcpy(sep->se_ctrladdr_un.sun_path, sep->se_service,
1855 SUN_PATH_MAXSIZE) >= SUN_PATH_MAXSIZE) {
1856 syslog(LOG_ERR,
1857 "domain socket pathname too long for service %s",
1858 sep->se_service);
1859 goto more;
1860 }
1861 #undef SUN_PATH_MAXSIZE
1862 sep->se_ctrladdr_size = sep->se_ctrladdr_un.sun_len =
1863 SUN_LEN(&sep->se_ctrladdr_un);
1864 }
1865 arg = sskip(&cp);
1866 if (!strncmp(arg, "wait", 4))
1867 sep->se_accept = 0;
1868 else if (!strncmp(arg, "nowait", 6))
1869 sep->se_accept = 1;
1870 else {
1871 syslog(LOG_ERR,
1872 "%s: bad wait/nowait for service %s",
1873 CONFIG, sep->se_service);
1874 goto more;
1875 }
1876 sep->se_maxchild = -1;
1877 sep->se_maxcpm = -1;
1878 sep->se_maxperip = -1;
1879 if ((s = strchr(arg, '/')) != NULL) {
1880 char *eptr;
1881 u_long val;
1882
1883 val = strtoul(s + 1, &eptr, 10);
1884 if (eptr == s + 1 || val > MAX_MAXCHLD) {
1885 syslog(LOG_ERR,
1886 "%s: bad max-child for service %s",
1887 CONFIG, sep->se_service);
1888 goto more;
1889 }
1890 if (debug)
1891 if (!sep->se_accept && val != 1)
1892 warnx("maxchild=%lu for wait service %s"
1893 " not recommended", val, sep->se_service);
1894 sep->se_maxchild = val;
1895 if (*eptr == '/')
1896 sep->se_maxcpm = strtol(eptr + 1, &eptr, 10);
1897 if (*eptr == '/')
1898 sep->se_maxperip = strtol(eptr + 1, &eptr, 10);
1899 /*
1900 * explicitly do not check for \0 for future expansion /
1901 * backwards compatibility
1902 */
1903 }
1904 if (ISMUX(sep)) {
1905 /*
1906 * Silently enforce "nowait" mode for TCPMUX services
1907 * since they don't have an assigned port to listen on.
1908 */
1909 sep->se_accept = 1;
1910 if (strcmp(sep->se_proto, "tcp")) {
1911 syslog(LOG_ERR,
1912 "%s: bad protocol for tcpmux service %s",
1913 CONFIG, sep->se_service);
1914 goto more;
1915 }
1916 if (sep->se_socktype != SOCK_STREAM) {
1917 syslog(LOG_ERR,
1918 "%s: bad socket type for tcpmux service %s",
1919 CONFIG, sep->se_service);
1920 goto more;
1921 }
1922 }
1923 sep->se_user = newstr(sskip(&cp));
1924 #ifdef LOGIN_CAP
1925 if ((s = strrchr(sep->se_user, '/')) != NULL) {
1926 *s = '\0';
1927 sep->se_class = newstr(s + 1);
1928 } else
1929 sep->se_class = newstr(RESOURCE_RC);
1930 #endif
1931 if ((s = strrchr(sep->se_user, ':')) != NULL) {
1932 *s = '\0';
1933 sep->se_group = newstr(s + 1);
1934 } else
1935 sep->se_group = NULL;
1936 sep->se_server = newstr(sskip(&cp));
1937 if ((sep->se_server_name = strrchr(sep->se_server, '/')))
1938 sep->se_server_name++;
1939 if (strcmp(sep->se_server, "internal") == 0) {
1940 struct biltin *bi;
1941
1942 for (bi = biltins; bi->bi_service; bi++)
1943 if (bi->bi_socktype == sep->se_socktype &&
1944 matchservent(bi->bi_service, sep->se_service,
1945 sep->se_proto))
1946 break;
1947 if (bi->bi_service == 0) {
1948 syslog(LOG_ERR, "internal service %s unknown",
1949 sep->se_service);
1950 goto more;
1951 }
1952 sep->se_accept = 1; /* force accept mode for built-ins */
1953 sep->se_bi = bi;
1954 } else
1955 sep->se_bi = NULL;
1956 if (sep->se_maxperip < 0)
1957 sep->se_maxperip = maxperip;
1958 if (sep->se_maxcpm < 0)
1959 sep->se_maxcpm = maxcpm;
1960 if (sep->se_maxchild < 0) { /* apply default max-children */
1961 if (sep->se_bi && sep->se_bi->bi_maxchild >= 0)
1962 sep->se_maxchild = sep->se_bi->bi_maxchild;
1963 else if (sep->se_accept)
1964 sep->se_maxchild = MAX(maxchild, 0);
1965 else
1966 sep->se_maxchild = 1;
1967 }
1968 LIST_INIT(&sep->se_children);
1969 argc = 0;
1970 for (arg = skip(&cp); cp; arg = skip(&cp))
1971 if (argc < MAXARGV) {
1972 sep->se_argv[argc++] = newstr(arg);
1973 } else {
1974 syslog(LOG_ERR,
1975 "%s: too many arguments for service %s",
1976 CONFIG, sep->se_service);
1977 goto more;
1978 }
1979 while (argc <= MAXARGV)
1980 sep->se_argv[argc++] = NULL;
1981 for (i = 0; i < PERIPSIZE; ++i)
1982 LIST_INIT(&sep->se_conn[i]);
1983 #ifdef IPSEC
1984 sep->se_policy = policy ? newstr(policy) : NULL;
1985 free(policy);
1986 #endif
1987 return (sep);
1988 }
1989
1990 static void
freeconfig(struct servtab * cp)1991 freeconfig(struct servtab *cp)
1992 {
1993 struct stabchild *sc;
1994 int i;
1995
1996 free(cp->se_service);
1997 free(cp->se_proto);
1998 free(cp->se_user);
1999 free(cp->se_group);
2000 #ifdef LOGIN_CAP
2001 free(cp->se_class);
2002 #endif
2003 free(cp->se_server);
2004 while (!LIST_EMPTY(&cp->se_children)) {
2005 sc = LIST_FIRST(&cp->se_children);
2006 LIST_REMOVE(sc, sc_link);
2007 free(sc);
2008 }
2009 for (i = 0; i < MAXARGV; i++)
2010 if (cp->se_argv[i])
2011 free(cp->se_argv[i]);
2012 free_connlist(cp);
2013 #ifdef IPSEC
2014 free(cp->se_policy);
2015 #endif
2016 }
2017
2018
2019 /*
2020 * Safe skip - if skip returns null, log a syntax error in the
2021 * configuration file and exit.
2022 */
2023 static char *
sskip(char ** cpp)2024 sskip(char **cpp)
2025 {
2026 char *cp;
2027
2028 cp = skip(cpp);
2029 if (cp == NULL) {
2030 syslog(LOG_ERR, "%s: syntax error", CONFIG);
2031 exit(EX_DATAERR);
2032 }
2033 return (cp);
2034 }
2035
2036 static char *
skip(char ** cpp)2037 skip(char **cpp)
2038 {
2039 char *cp = *cpp;
2040 char *start;
2041 char quote = '\0';
2042
2043 again:
2044 while (*cp == ' ' || *cp == '\t')
2045 cp++;
2046 if (*cp == '\0') {
2047 int c;
2048
2049 c = getc(fconfig);
2050 (void) ungetc(c, fconfig);
2051 if (c == ' ' || c == '\t')
2052 if ((cp = nextline(fconfig)))
2053 goto again;
2054 *cpp = (char *)0;
2055 return ((char *)0);
2056 }
2057 if (*cp == '"' || *cp == '\'')
2058 quote = *cp++;
2059 start = cp;
2060 if (quote)
2061 while (*cp && *cp != quote)
2062 cp++;
2063 else
2064 while (*cp && *cp != ' ' && *cp != '\t')
2065 cp++;
2066 if (*cp != '\0')
2067 *cp++ = '\0';
2068 *cpp = cp;
2069 return (start);
2070 }
2071
2072 static char *
nextline(FILE * fd)2073 nextline(FILE *fd)
2074 {
2075 char *cp;
2076
2077 if (fgets(line, sizeof (line), fd) == NULL)
2078 return ((char *)0);
2079 cp = strchr(line, '\n');
2080 if (cp)
2081 *cp = '\0';
2082 return (line);
2083 }
2084
2085 static char *
newstr(const char * cp)2086 newstr(const char *cp)
2087 {
2088 char *cr;
2089
2090 if ((cr = strdup(cp != NULL ? cp : "")))
2091 return (cr);
2092 syslog(LOG_ERR, "strdup: %m");
2093 exit(EX_OSERR);
2094 }
2095
2096 void
inetd_setproctitle(const char * a,int s)2097 inetd_setproctitle(const char *a, int s)
2098 {
2099 socklen_t size;
2100 struct sockaddr_storage ss;
2101 char buf[80], pbuf[NI_MAXHOST];
2102
2103 size = sizeof(ss);
2104 if (getpeername(s, (struct sockaddr *)&ss, &size) == 0) {
2105 getnameinfo((struct sockaddr *)&ss, size, pbuf, sizeof(pbuf),
2106 NULL, 0, NI_NUMERICHOST);
2107 (void) sprintf(buf, "%s [%s]", a, pbuf);
2108 } else
2109 (void) sprintf(buf, "%s", a);
2110 setproctitle("%s", buf);
2111 }
2112
2113 int
check_loop(const struct sockaddr * sa,const struct servtab * sep)2114 check_loop(const struct sockaddr *sa, const struct servtab *sep)
2115 {
2116 struct servtab *se2;
2117 char pname[NI_MAXHOST];
2118
2119 for (se2 = servtab; se2; se2 = se2->se_next) {
2120 if (!se2->se_bi || se2->se_socktype != SOCK_DGRAM)
2121 continue;
2122
2123 switch (se2->se_family) {
2124 case AF_INET:
2125 if (csatosin(sa)->sin_port ==
2126 se2->se_ctrladdr4.sin_port)
2127 goto isloop;
2128 continue;
2129 #ifdef INET6
2130 case AF_INET6:
2131 if (csatosin6(sa)->sin6_port ==
2132 se2->se_ctrladdr6.sin6_port)
2133 goto isloop;
2134 continue;
2135 #endif
2136 default:
2137 continue;
2138 }
2139 isloop:
2140 getnameinfo(sa, sa->sa_len, pname, sizeof(pname), NULL, 0,
2141 NI_NUMERICHOST);
2142 syslog(LOG_WARNING, "%s/%s:%s/%s loop request REFUSED from %s",
2143 sep->se_service, sep->se_proto,
2144 se2->se_service, se2->se_proto,
2145 pname);
2146 return 1;
2147 }
2148 return 0;
2149 }
2150
2151 /*
2152 * print_service:
2153 * Dump relevant information to stderr
2154 */
2155 static void
print_service(const char * action,const struct servtab * sep)2156 print_service(const char *action, const struct servtab *sep)
2157 {
2158 fprintf(stderr,
2159 "%s: %s proto=%s accept=%d max=%d user=%s group=%s"
2160 #ifdef LOGIN_CAP
2161 "class=%s"
2162 #endif
2163 " builtin=%p server=%s"
2164 #ifdef IPSEC
2165 " policy=\"%s\""
2166 #endif
2167 "\n",
2168 action, sep->se_service, sep->se_proto,
2169 sep->se_accept, sep->se_maxchild, sep->se_user, sep->se_group,
2170 #ifdef LOGIN_CAP
2171 sep->se_class,
2172 #endif
2173 (void *) sep->se_bi, sep->se_server
2174 #ifdef IPSEC
2175 , (sep->se_policy ? sep->se_policy : "")
2176 #endif
2177 );
2178 }
2179
2180 #define CPMHSIZE 256
2181 #define CPMHMASK (CPMHSIZE-1)
2182 #define CHTGRAN 10
2183 #define CHTSIZE 6
2184
2185 typedef struct CTime {
2186 unsigned long ct_Ticks;
2187 int ct_Count;
2188 } CTime;
2189
2190 typedef struct CHash {
2191 union {
2192 struct in_addr c4_Addr;
2193 struct in6_addr c6_Addr;
2194 } cu_Addr;
2195 #define ch_Addr4 cu_Addr.c4_Addr
2196 #define ch_Addr6 cu_Addr.c6_Addr
2197 int ch_Family;
2198 time_t ch_LTime;
2199 char *ch_Service;
2200 CTime ch_Times[CHTSIZE];
2201 } CHash;
2202
2203 static CHash CHashAry[CPMHSIZE];
2204
2205 static int
cpmip(const struct servtab * sep,int ctrl)2206 cpmip(const struct servtab *sep, int ctrl)
2207 {
2208 struct sockaddr_storage rss;
2209 socklen_t rssLen = sizeof(rss);
2210 int r = 0;
2211
2212 /*
2213 * If getpeername() fails, just let it through (if logging is
2214 * enabled the condition is caught elsewhere)
2215 */
2216
2217 if (sep->se_maxcpm > 0 &&
2218 (sep->se_family == AF_INET || sep->se_family == AF_INET6) &&
2219 getpeername(ctrl, (struct sockaddr *)&rss, &rssLen) == 0 ) {
2220 time_t t = time(NULL);
2221 unsigned int hv = 0xABC3D20F;
2222 int i;
2223 int cnt = 0;
2224 CHash *chBest = NULL;
2225 unsigned int ticks = t / CHTGRAN;
2226 struct sockaddr_in *sin4;
2227 #ifdef INET6
2228 struct sockaddr_in6 *sin6;
2229 #endif
2230
2231 sin4 = (struct sockaddr_in *)&rss;
2232 #ifdef INET6
2233 sin6 = (struct sockaddr_in6 *)&rss;
2234 #endif
2235 {
2236 char *p;
2237 int addrlen;
2238
2239 switch (rss.ss_family) {
2240 case AF_INET:
2241 p = (char *)&sin4->sin_addr;
2242 addrlen = sizeof(struct in_addr);
2243 break;
2244 #ifdef INET6
2245 case AF_INET6:
2246 p = (char *)&sin6->sin6_addr;
2247 addrlen = sizeof(struct in6_addr);
2248 break;
2249 #endif
2250 default:
2251 /* should not happen */
2252 return -1;
2253 }
2254
2255 for (i = 0; i < addrlen; ++i, ++p) {
2256 hv = (hv << 5) ^ (hv >> 23) ^ *p;
2257 }
2258 hv = (hv ^ (hv >> 16));
2259 }
2260 for (i = 0; i < 5; ++i) {
2261 CHash *ch = &CHashAry[(hv + i) & CPMHMASK];
2262
2263 if (rss.ss_family == AF_INET &&
2264 ch->ch_Family == AF_INET &&
2265 sin4->sin_addr.s_addr == ch->ch_Addr4.s_addr &&
2266 ch->ch_Service && strcmp(sep->se_service,
2267 ch->ch_Service) == 0) {
2268 chBest = ch;
2269 break;
2270 }
2271 #ifdef INET6
2272 if (rss.ss_family == AF_INET6 &&
2273 ch->ch_Family == AF_INET6 &&
2274 IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
2275 &ch->ch_Addr6) != 0 &&
2276 ch->ch_Service && strcmp(sep->se_service,
2277 ch->ch_Service) == 0) {
2278 chBest = ch;
2279 break;
2280 }
2281 #endif
2282 if (chBest == NULL || ch->ch_LTime == 0 ||
2283 ch->ch_LTime < chBest->ch_LTime) {
2284 chBest = ch;
2285 }
2286 }
2287 if ((rss.ss_family == AF_INET &&
2288 (chBest->ch_Family != AF_INET ||
2289 sin4->sin_addr.s_addr != chBest->ch_Addr4.s_addr)) ||
2290 chBest->ch_Service == NULL ||
2291 strcmp(sep->se_service, chBest->ch_Service) != 0) {
2292 chBest->ch_Family = sin4->sin_family;
2293 chBest->ch_Addr4 = sin4->sin_addr;
2294 free(chBest->ch_Service);
2295 chBest->ch_Service = strdup(sep->se_service);
2296 memset(chBest->ch_Times, 0, sizeof(chBest->ch_Times));
2297 }
2298 #ifdef INET6
2299 if ((rss.ss_family == AF_INET6 &&
2300 (chBest->ch_Family != AF_INET6 ||
2301 IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
2302 &chBest->ch_Addr6) == 0)) ||
2303 chBest->ch_Service == NULL ||
2304 strcmp(sep->se_service, chBest->ch_Service) != 0) {
2305 chBest->ch_Family = sin6->sin6_family;
2306 chBest->ch_Addr6 = sin6->sin6_addr;
2307 free(chBest->ch_Service);
2308 chBest->ch_Service = strdup(sep->se_service);
2309 memset(chBest->ch_Times, 0, sizeof(chBest->ch_Times));
2310 }
2311 #endif
2312 chBest->ch_LTime = t;
2313 {
2314 CTime *ct = &chBest->ch_Times[ticks % CHTSIZE];
2315 if (ct->ct_Ticks != ticks) {
2316 ct->ct_Ticks = ticks;
2317 ct->ct_Count = 0;
2318 }
2319 ++ct->ct_Count;
2320 }
2321 for (i = 0; i < CHTSIZE; ++i) {
2322 CTime *ct = &chBest->ch_Times[i];
2323 if (ct->ct_Ticks <= ticks &&
2324 ct->ct_Ticks >= ticks - CHTSIZE) {
2325 cnt += ct->ct_Count;
2326 }
2327 }
2328 if ((cnt * 60) / (CHTSIZE * CHTGRAN) > sep->se_maxcpm) {
2329 char pname[NI_MAXHOST];
2330
2331 getnameinfo((struct sockaddr *)&rss,
2332 ((struct sockaddr *)&rss)->sa_len,
2333 pname, sizeof(pname), NULL, 0,
2334 NI_NUMERICHOST);
2335 r = -1;
2336 syslog(LOG_ERR,
2337 "%s from %s exceeded counts/min (limit %d/min)",
2338 sep->se_service, pname,
2339 sep->se_maxcpm);
2340 }
2341 }
2342 return(r);
2343 }
2344
2345 static struct conninfo *
search_conn(struct servtab * sep,int ctrl)2346 search_conn(struct servtab *sep, int ctrl)
2347 {
2348 struct sockaddr_storage ss;
2349 socklen_t sslen = sizeof(ss);
2350 struct conninfo *conn;
2351 int hv;
2352 char pname[NI_MAXHOST], pname2[NI_MAXHOST];
2353
2354 if (sep->se_maxperip <= 0)
2355 return NULL;
2356
2357 /*
2358 * If getpeername() fails, just let it through (if logging is
2359 * enabled the condition is caught elsewhere)
2360 */
2361 if (getpeername(ctrl, (struct sockaddr *)&ss, &sslen) != 0)
2362 return NULL;
2363
2364 switch (ss.ss_family) {
2365 case AF_INET:
2366 hv = hashval((char *)&((struct sockaddr_in *)&ss)->sin_addr,
2367 sizeof(struct in_addr));
2368 break;
2369 #ifdef INET6
2370 case AF_INET6:
2371 hv = hashval((char *)&((struct sockaddr_in6 *)&ss)->sin6_addr,
2372 sizeof(struct in6_addr));
2373 break;
2374 #endif
2375 default:
2376 /*
2377 * Since we only support AF_INET and AF_INET6, just
2378 * let other than AF_INET and AF_INET6 through.
2379 */
2380 return NULL;
2381 }
2382
2383 if (getnameinfo((struct sockaddr *)&ss, sslen, pname, sizeof(pname),
2384 NULL, 0, NI_NUMERICHOST) != 0)
2385 return NULL;
2386
2387 LIST_FOREACH(conn, &sep->se_conn[hv], co_link) {
2388 if (getnameinfo((struct sockaddr *)&conn->co_addr,
2389 conn->co_addr.ss_len, pname2, sizeof(pname2), NULL, 0,
2390 NI_NUMERICHOST) == 0 &&
2391 strcmp(pname, pname2) == 0)
2392 break;
2393 }
2394
2395 if (conn == NULL) {
2396 if ((conn = malloc(sizeof(struct conninfo))) == NULL) {
2397 syslog(LOG_ERR, "malloc: %m");
2398 exit(EX_OSERR);
2399 }
2400 conn->co_proc = reallocarray(NULL, sep->se_maxperip,
2401 sizeof(*conn->co_proc));
2402 if (conn->co_proc == NULL) {
2403 syslog(LOG_ERR, "reallocarray: %m");
2404 exit(EX_OSERR);
2405 }
2406 memcpy(&conn->co_addr, (struct sockaddr *)&ss, sslen);
2407 conn->co_numchild = 0;
2408 LIST_INSERT_HEAD(&sep->se_conn[hv], conn, co_link);
2409 }
2410
2411 /*
2412 * Since a child process is not invoked yet, we cannot
2413 * determine a pid of a child. So, co_proc and co_numchild
2414 * should be filled leter.
2415 */
2416
2417 return conn;
2418 }
2419
2420 static int
room_conn(struct servtab * sep,struct conninfo * conn)2421 room_conn(struct servtab *sep, struct conninfo *conn)
2422 {
2423 char pname[NI_MAXHOST];
2424
2425 if (conn->co_numchild >= sep->se_maxperip) {
2426 getnameinfo((struct sockaddr *)&conn->co_addr,
2427 conn->co_addr.ss_len, pname, sizeof(pname), NULL, 0,
2428 NI_NUMERICHOST);
2429 syslog(LOG_ERR, "%s from %s exceeded counts (limit %d)",
2430 sep->se_service, pname, sep->se_maxperip);
2431 return 0;
2432 }
2433 return 1;
2434 }
2435
2436 static void
addchild_conn(struct conninfo * conn,pid_t pid)2437 addchild_conn(struct conninfo *conn, pid_t pid)
2438 {
2439 struct procinfo *proc;
2440
2441 if (conn == NULL)
2442 return;
2443
2444 if ((proc = search_proc(pid, 1)) != NULL) {
2445 if (proc->pr_conn != NULL) {
2446 syslog(LOG_ERR,
2447 "addchild_conn: child already on process list");
2448 exit(EX_OSERR);
2449 }
2450 proc->pr_conn = conn;
2451 }
2452
2453 conn->co_proc[conn->co_numchild++] = proc;
2454 }
2455
2456 static void
reapchild_conn(pid_t pid)2457 reapchild_conn(pid_t pid)
2458 {
2459 struct procinfo *proc;
2460 struct conninfo *conn;
2461 int i;
2462
2463 if ((proc = search_proc(pid, 0)) == NULL)
2464 return;
2465 if ((conn = proc->pr_conn) == NULL)
2466 return;
2467 for (i = 0; i < conn->co_numchild; ++i)
2468 if (conn->co_proc[i] == proc) {
2469 conn->co_proc[i] = conn->co_proc[--conn->co_numchild];
2470 break;
2471 }
2472 free_proc(proc);
2473 free_conn(conn);
2474 }
2475
2476 static void
resize_conn(struct servtab * sep,int maxpip)2477 resize_conn(struct servtab *sep, int maxpip)
2478 {
2479 struct conninfo *conn;
2480 int i, j;
2481
2482 if (sep->se_maxperip <= 0)
2483 return;
2484 if (maxpip <= 0) {
2485 free_connlist(sep);
2486 return;
2487 }
2488 for (i = 0; i < PERIPSIZE; ++i) {
2489 LIST_FOREACH(conn, &sep->se_conn[i], co_link) {
2490 for (j = maxpip; j < conn->co_numchild; ++j)
2491 free_proc(conn->co_proc[j]);
2492 conn->co_proc = reallocarray(conn->co_proc, maxpip,
2493 sizeof(*conn->co_proc));
2494 if (conn->co_proc == NULL) {
2495 syslog(LOG_ERR, "reallocarray: %m");
2496 exit(EX_OSERR);
2497 }
2498 if (conn->co_numchild > maxpip)
2499 conn->co_numchild = maxpip;
2500 }
2501 }
2502 }
2503
2504 static void
free_connlist(struct servtab * sep)2505 free_connlist(struct servtab *sep)
2506 {
2507 struct conninfo *conn, *conn_temp;
2508 int i, j;
2509
2510 for (i = 0; i < PERIPSIZE; ++i) {
2511 LIST_FOREACH_SAFE(conn, &sep->se_conn[i], co_link, conn_temp) {
2512 if (conn == NULL) {
2513 LIST_REMOVE(conn, co_link);
2514 continue;
2515 }
2516 for (j = 0; j < conn->co_numchild; ++j)
2517 free_proc(conn->co_proc[j]);
2518 conn->co_numchild = 0;
2519 free_conn(conn);
2520 }
2521 }
2522 }
2523
2524 static void
free_conn(struct conninfo * conn)2525 free_conn(struct conninfo *conn)
2526 {
2527 if (conn == NULL)
2528 return;
2529 if (conn->co_numchild <= 0) {
2530 LIST_REMOVE(conn, co_link);
2531 free(conn->co_proc);
2532 free(conn);
2533 }
2534 }
2535
2536 static struct procinfo *
search_proc(pid_t pid,int add)2537 search_proc(pid_t pid, int add)
2538 {
2539 struct procinfo *proc;
2540 int hv;
2541
2542 hv = hashval((char *)&pid, sizeof(pid));
2543 LIST_FOREACH(proc, &proctable[hv], pr_link) {
2544 if (proc->pr_pid == pid)
2545 break;
2546 }
2547 if (proc == NULL && add) {
2548 if ((proc = malloc(sizeof(struct procinfo))) == NULL) {
2549 syslog(LOG_ERR, "malloc: %m");
2550 exit(EX_OSERR);
2551 }
2552 proc->pr_pid = pid;
2553 proc->pr_conn = NULL;
2554 LIST_INSERT_HEAD(&proctable[hv], proc, pr_link);
2555 }
2556 return proc;
2557 }
2558
2559 static void
free_proc(struct procinfo * proc)2560 free_proc(struct procinfo *proc)
2561 {
2562 if (proc == NULL)
2563 return;
2564 LIST_REMOVE(proc, pr_link);
2565 free(proc);
2566 }
2567
2568 static int
hashval(char * p,int len)2569 hashval(char *p, int len)
2570 {
2571 unsigned int hv = 0xABC3D20F;
2572 int i;
2573
2574 for (i = 0; i < len; ++i, ++p)
2575 hv = (hv << 5) ^ (hv >> 23) ^ *p;
2576 hv = (hv ^ (hv >> 16)) & (PERIPSIZE - 1);
2577 return hv;
2578 }
2579