1 /*
2 * Copyright (c) 1983, 1991, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #ifndef lint
31 static const char copyright[] =
32 "@(#) Copyright (c) 1983, 1991, 1993, 1994\n\
33 The Regents of the University of California. All rights reserved.\n";
34 #endif /* not lint */
35
36 #ifndef lint
37 #if 0
38 static char sccsid[] = "@(#)from: inetd.c 8.4 (Berkeley) 4/13/94";
39 #endif
40 #endif /* not lint */
41
42 #include <sys/cdefs.h>
43 __FBSDID("$FreeBSD: stable/9/usr.sbin/inetd/inetd.c 246402 2013-02-06 13:16:43Z zont $");
44
45 /*
46 * Inetd - Internet super-server
47 *
48 * This program invokes all internet services as needed. Connection-oriented
49 * services are invoked each time a connection is made, by creating a process.
50 * This process is passed the connection as file descriptor 0 and is expected
51 * to do a getpeername to find out the source host and port.
52 *
53 * Datagram oriented services are invoked when a datagram
54 * arrives; a process is created and passed a pending message
55 * on file descriptor 0. Datagram servers may either connect
56 * to their peer, freeing up the original socket for inetd
57 * to receive further messages on, or ``take over the socket'',
58 * processing all arriving datagrams and, eventually, timing
59 * out. The first type of server is said to be ``multi-threaded'';
60 * the second type of server ``single-threaded''.
61 *
62 * Inetd uses a configuration file which is read at startup
63 * and, possibly, at some later time in response to a hangup signal.
64 * The configuration file is ``free format'' with fields given in the
65 * order shown below. Continuation lines for an entry must begin with
66 * a space or tab. All fields must be present in each entry.
67 *
68 * service name must be in /etc/services
69 * or name a tcpmux service
70 * or specify a unix domain socket
71 * socket type stream/dgram/raw/rdm/seqpacket
72 * protocol tcp[4][6][/faith], udp[4][6], unix
73 * wait/nowait single-threaded/multi-threaded
74 * user[:group][/login-class] user/group/login-class to run daemon as
75 * server program full path name
76 * server program arguments maximum of MAXARGS (20)
77 *
78 * TCP services without official port numbers are handled with the
79 * RFC1078-based tcpmux internal service. Tcpmux listens on port 1 for
80 * requests. When a connection is made from a foreign host, the service
81 * requested is passed to tcpmux, which looks it up in the servtab list
82 * and returns the proper entry for the service. Tcpmux returns a
83 * negative reply if the service doesn't exist, otherwise the invoked
84 * server is expected to return the positive reply if the service type in
85 * inetd.conf file has the prefix "tcpmux/". If the service type has the
86 * prefix "tcpmux/+", tcpmux will return the positive reply for the
87 * process; this is for compatibility with older server code, and also
88 * allows you to invoke programs that use stdin/stdout without putting any
89 * special server code in them. Services that use tcpmux are "nowait"
90 * because they do not have a well-known port and hence cannot listen
91 * for new requests.
92 *
93 * For RPC services
94 * service name/version must be in /etc/rpc
95 * socket type stream/dgram/raw/rdm/seqpacket
96 * protocol rpc/tcp[4][6], rpc/udp[4][6]
97 * wait/nowait single-threaded/multi-threaded
98 * user[:group][/login-class] user/group/login-class to run daemon as
99 * server program full path name
100 * server program arguments maximum of MAXARGS
101 *
102 * Comment lines are indicated by a `#' in column 1.
103 *
104 * #ifdef IPSEC
105 * Comment lines that start with "#@" denote IPsec policy string, as described
106 * in ipsec_set_policy(3). This will affect all the following items in
107 * inetd.conf(8). To reset the policy, just use "#@" line. By default,
108 * there's no IPsec policy.
109 * #endif
110 */
111 #include <sys/param.h>
112 #include <sys/ioctl.h>
113 #include <sys/mman.h>
114 #include <sys/wait.h>
115 #include <sys/time.h>
116 #include <sys/resource.h>
117 #include <sys/stat.h>
118 #include <sys/un.h>
119
120 #include <netinet/in.h>
121 #include <netinet/tcp.h>
122 #include <arpa/inet.h>
123 #include <rpc/rpc.h>
124 #include <rpc/pmap_clnt.h>
125
126 #include <ctype.h>
127 #include <errno.h>
128 #include <err.h>
129 #include <fcntl.h>
130 #include <grp.h>
131 #include <libutil.h>
132 #include <limits.h>
133 #include <netdb.h>
134 #include <pwd.h>
135 #include <signal.h>
136 #include <stdio.h>
137 #include <stdlib.h>
138 #include <string.h>
139 #include <sysexits.h>
140 #include <syslog.h>
141 #include <tcpd.h>
142 #include <unistd.h>
143
144 #include "inetd.h"
145 #include "pathnames.h"
146
147 #ifdef IPSEC
148 #include <netipsec/ipsec.h>
149 #ifndef IPSEC_POLICY_IPSEC /* no ipsec support on old ipsec */
150 #undef IPSEC
151 #endif
152 #endif
153
154 #ifndef LIBWRAP_ALLOW_FACILITY
155 # define LIBWRAP_ALLOW_FACILITY LOG_AUTH
156 #endif
157 #ifndef LIBWRAP_ALLOW_SEVERITY
158 # define LIBWRAP_ALLOW_SEVERITY LOG_INFO
159 #endif
160 #ifndef LIBWRAP_DENY_FACILITY
161 # define LIBWRAP_DENY_FACILITY LOG_AUTH
162 #endif
163 #ifndef LIBWRAP_DENY_SEVERITY
164 # define LIBWRAP_DENY_SEVERITY LOG_WARNING
165 #endif
166
167 #define ISWRAP(sep) \
168 ( ((wrap_ex && !(sep)->se_bi) || (wrap_bi && (sep)->se_bi)) \
169 && (sep->se_family == AF_INET || sep->se_family == AF_INET6) \
170 && ( ((sep)->se_accept && (sep)->se_socktype == SOCK_STREAM) \
171 || (sep)->se_socktype == SOCK_DGRAM))
172
173 #ifdef LOGIN_CAP
174 #include <login_cap.h>
175
176 /* see init.c */
177 #define RESOURCE_RC "daemon"
178
179 #endif
180
181 #ifndef MAXCHILD
182 #define MAXCHILD -1 /* maximum number of this service
183 < 0 = no limit */
184 #endif
185
186 #ifndef MAXCPM
187 #define MAXCPM -1 /* rate limit invocations from a
188 single remote address,
189 < 0 = no limit */
190 #endif
191
192 #ifndef MAXPERIP
193 #define MAXPERIP -1 /* maximum number of this service
194 from a single remote address,
195 < 0 = no limit */
196 #endif
197
198 #ifndef TOOMANY
199 #define TOOMANY 256 /* don't start more than TOOMANY */
200 #endif
201 #define CNT_INTVL 60 /* servers in CNT_INTVL sec. */
202 #define RETRYTIME (60*10) /* retry after bind or server fail */
203 #define MAX_MAXCHLD 32767 /* max allowable max children */
204
205 #define SIGBLOCK (sigmask(SIGCHLD)|sigmask(SIGHUP)|sigmask(SIGALRM))
206
207 void close_sep(struct servtab *);
208 void flag_signal(int);
209 void flag_config(int);
210 void config(void);
211 int cpmip(const struct servtab *, int);
212 void endconfig(void);
213 struct servtab *enter(struct servtab *);
214 void freeconfig(struct servtab *);
215 struct servtab *getconfigent(void);
216 int matchservent(const char *, const char *, const char *);
217 char *nextline(FILE *);
218 void addchild(struct servtab *, int);
219 void flag_reapchild(int);
220 void reapchild(void);
221 void enable(struct servtab *);
222 void disable(struct servtab *);
223 void flag_retry(int);
224 void retry(void);
225 int setconfig(void);
226 void setup(struct servtab *);
227 #ifdef IPSEC
228 void ipsecsetup(struct servtab *);
229 #endif
230 void unregisterrpc(register struct servtab *sep);
231 static struct conninfo *search_conn(struct servtab *sep, int ctrl);
232 static int room_conn(struct servtab *sep, struct conninfo *conn);
233 static void addchild_conn(struct conninfo *conn, pid_t pid);
234 static void reapchild_conn(pid_t pid);
235 static void free_conn(struct conninfo *conn);
236 static void resize_conn(struct servtab *sep, int maxperip);
237 static void free_connlist(struct servtab *sep);
238 static void free_proc(struct procinfo *);
239 static struct procinfo *search_proc(pid_t pid, int add);
240 static int hashval(char *p, int len);
241
242 int allow_severity;
243 int deny_severity;
244 int wrap_ex = 0;
245 int wrap_bi = 0;
246 int debug = 0;
247 int dolog = 0;
248 int maxsock; /* highest-numbered descriptor */
249 fd_set allsock;
250 int options;
251 int timingout;
252 int toomany = TOOMANY;
253 int maxchild = MAXCHILD;
254 int maxcpm = MAXCPM;
255 int maxperip = MAXPERIP;
256 struct servent *sp;
257 struct rpcent *rpc;
258 char *hostname = NULL;
259 struct sockaddr_in *bind_sa4;
260 int v4bind_ok = 0;
261 #ifdef INET6
262 struct sockaddr_in6 *bind_sa6;
263 int v6bind_ok = 0;
264 #endif
265 int signalpipe[2];
266 #ifdef SANITY_CHECK
267 int nsock;
268 #endif
269 uid_t euid;
270 gid_t egid;
271 mode_t mask;
272
273 struct servtab *servtab;
274
275 extern struct biltin biltins[];
276
277 const char *CONFIG = _PATH_INETDCONF;
278 const char *pid_file = _PATH_INETDPID;
279 struct pidfh *pfh = NULL;
280
281 struct netconfig *udpconf, *tcpconf, *udp6conf, *tcp6conf;
282
283 static LIST_HEAD(, procinfo) proctable[PERIPSIZE];
284
285 int
getvalue(const char * arg,int * value,const char * whine)286 getvalue(const char *arg, int *value, const char *whine)
287 {
288 int tmp;
289 char *p;
290
291 tmp = strtol(arg, &p, 0);
292 if (tmp < 0 || *p) {
293 syslog(LOG_ERR, whine, arg);
294 return 1; /* failure */
295 }
296 *value = tmp;
297 return 0; /* success */
298 }
299
300 static sa_family_t
whichaf(struct request_info * req)301 whichaf(struct request_info *req)
302 {
303 struct sockaddr *sa;
304
305 sa = (struct sockaddr *)req->client->sin;
306 if (sa == NULL)
307 return AF_UNSPEC;
308 if (sa->sa_family == AF_INET6 &&
309 IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)sa)->sin6_addr))
310 return AF_INET;
311 return sa->sa_family;
312 }
313
314 int
main(int argc,char ** argv)315 main(int argc, char **argv)
316 {
317 struct servtab *sep;
318 struct passwd *pwd;
319 struct group *grp;
320 struct sigaction sa, saalrm, sachld, sahup, sapipe;
321 int ch, dofork;
322 pid_t pid;
323 char buf[50];
324 #ifdef LOGIN_CAP
325 login_cap_t *lc = NULL;
326 #endif
327 struct request_info req;
328 int denied;
329 char *service = NULL;
330 union {
331 struct sockaddr peer_un;
332 struct sockaddr_in peer_un4;
333 struct sockaddr_in6 peer_un6;
334 struct sockaddr_storage peer_max;
335 } p_un;
336 #define peer p_un.peer_un
337 #define peer4 p_un.peer_un4
338 #define peer6 p_un.peer_un6
339 #define peermax p_un.peer_max
340 int i;
341 struct addrinfo hints, *res;
342 const char *servname;
343 int error;
344 struct conninfo *conn;
345
346 openlog("inetd", LOG_PID | LOG_NOWAIT | LOG_PERROR, LOG_DAEMON);
347
348 while ((ch = getopt(argc, argv, "dlwWR:a:c:C:p:s:")) != -1)
349 switch(ch) {
350 case 'd':
351 debug = 1;
352 options |= SO_DEBUG;
353 break;
354 case 'l':
355 dolog = 1;
356 break;
357 case 'R':
358 getvalue(optarg, &toomany,
359 "-R %s: bad value for service invocation rate");
360 break;
361 case 'c':
362 getvalue(optarg, &maxchild,
363 "-c %s: bad value for maximum children");
364 break;
365 case 'C':
366 getvalue(optarg, &maxcpm,
367 "-C %s: bad value for maximum children/minute");
368 break;
369 case 'a':
370 hostname = optarg;
371 break;
372 case 'p':
373 pid_file = optarg;
374 break;
375 case 's':
376 getvalue(optarg, &maxperip,
377 "-s %s: bad value for maximum children per source address");
378 break;
379 case 'w':
380 wrap_ex++;
381 break;
382 case 'W':
383 wrap_bi++;
384 break;
385 case '?':
386 default:
387 syslog(LOG_ERR,
388 "usage: inetd [-dlwW] [-a address] [-R rate]"
389 " [-c maximum] [-C rate]"
390 " [-p pidfile] [conf-file]");
391 exit(EX_USAGE);
392 }
393 /*
394 * Initialize Bind Addrs.
395 * When hostname is NULL, wild card bind addrs are obtained from
396 * getaddrinfo(). But getaddrinfo() requires at least one of
397 * hostname or servname is non NULL.
398 * So when hostname is NULL, set dummy value to servname.
399 * Since getaddrinfo() doesn't accept numeric servname, and
400 * we doesn't use ai_socktype of struct addrinfo returned
401 * from getaddrinfo(), we set dummy value to ai_socktype.
402 */
403 servname = (hostname == NULL) ? "0" /* dummy */ : NULL;
404
405 bzero(&hints, sizeof(struct addrinfo));
406 hints.ai_flags = AI_PASSIVE;
407 hints.ai_family = AF_UNSPEC;
408 hints.ai_socktype = SOCK_STREAM; /* dummy */
409 error = getaddrinfo(hostname, servname, &hints, &res);
410 if (error != 0) {
411 syslog(LOG_ERR, "-a %s: %s", hostname, gai_strerror(error));
412 if (error == EAI_SYSTEM)
413 syslog(LOG_ERR, "%s", strerror(errno));
414 exit(EX_USAGE);
415 }
416 do {
417 if (res->ai_addr == NULL) {
418 syslog(LOG_ERR, "-a %s: getaddrinfo failed", hostname);
419 exit(EX_USAGE);
420 }
421 switch (res->ai_addr->sa_family) {
422 case AF_INET:
423 if (v4bind_ok)
424 continue;
425 bind_sa4 = (struct sockaddr_in *)res->ai_addr;
426 /* init port num in case servname is dummy */
427 bind_sa4->sin_port = 0;
428 v4bind_ok = 1;
429 continue;
430 #ifdef INET6
431 case AF_INET6:
432 if (v6bind_ok)
433 continue;
434 bind_sa6 = (struct sockaddr_in6 *)res->ai_addr;
435 /* init port num in case servname is dummy */
436 bind_sa6->sin6_port = 0;
437 v6bind_ok = 1;
438 continue;
439 #endif
440 }
441 if (v4bind_ok
442 #ifdef INET6
443 && v6bind_ok
444 #endif
445 )
446 break;
447 } while ((res = res->ai_next) != NULL);
448 if (!v4bind_ok
449 #ifdef INET6
450 && !v6bind_ok
451 #endif
452 ) {
453 syslog(LOG_ERR, "-a %s: unknown address family", hostname);
454 exit(EX_USAGE);
455 }
456
457 euid = geteuid();
458 egid = getegid();
459 umask(mask = umask(0777));
460
461 argc -= optind;
462 argv += optind;
463
464 if (argc > 0)
465 CONFIG = argv[0];
466 if (access(CONFIG, R_OK) < 0)
467 syslog(LOG_ERR, "Accessing %s: %m, continuing anyway.", CONFIG);
468 if (debug == 0) {
469 pid_t otherpid;
470
471 pfh = pidfile_open(pid_file, 0600, &otherpid);
472 if (pfh == NULL) {
473 if (errno == EEXIST) {
474 syslog(LOG_ERR, "%s already running, pid: %d",
475 getprogname(), otherpid);
476 exit(EX_OSERR);
477 }
478 syslog(LOG_WARNING, "pidfile_open() failed: %m");
479 }
480
481 if (daemon(0, 0) < 0) {
482 syslog(LOG_WARNING, "daemon(0,0) failed: %m");
483 }
484 /* From now on we don't want syslog messages going to stderr. */
485 closelog();
486 openlog("inetd", LOG_PID | LOG_NOWAIT, LOG_DAEMON);
487 /*
488 * In case somebody has started inetd manually, we need to
489 * clear the logname, so that old servers run as root do not
490 * get the user's logname..
491 */
492 if (setlogin("") < 0) {
493 syslog(LOG_WARNING, "cannot clear logname: %m");
494 /* no big deal if it fails.. */
495 }
496 if (pfh != NULL && pidfile_write(pfh) == -1) {
497 syslog(LOG_WARNING, "pidfile_write(): %m");
498 }
499 }
500
501 if (madvise(NULL, 0, MADV_PROTECT) != 0)
502 syslog(LOG_WARNING, "madvise() failed: %s", strerror(errno));
503
504 for (i = 0; i < PERIPSIZE; ++i)
505 LIST_INIT(&proctable[i]);
506
507 if (v4bind_ok) {
508 udpconf = getnetconfigent("udp");
509 tcpconf = getnetconfigent("tcp");
510 if (udpconf == NULL || tcpconf == NULL) {
511 syslog(LOG_ERR, "unknown rpc/udp or rpc/tcp");
512 exit(EX_USAGE);
513 }
514 }
515 #ifdef INET6
516 if (v6bind_ok) {
517 udp6conf = getnetconfigent("udp6");
518 tcp6conf = getnetconfigent("tcp6");
519 if (udp6conf == NULL || tcp6conf == NULL) {
520 syslog(LOG_ERR, "unknown rpc/udp6 or rpc/tcp6");
521 exit(EX_USAGE);
522 }
523 }
524 #endif
525
526 sa.sa_flags = 0;
527 sigemptyset(&sa.sa_mask);
528 sigaddset(&sa.sa_mask, SIGALRM);
529 sigaddset(&sa.sa_mask, SIGCHLD);
530 sigaddset(&sa.sa_mask, SIGHUP);
531 sa.sa_handler = flag_retry;
532 sigaction(SIGALRM, &sa, &saalrm);
533 config();
534 sa.sa_handler = flag_config;
535 sigaction(SIGHUP, &sa, &sahup);
536 sa.sa_handler = flag_reapchild;
537 sigaction(SIGCHLD, &sa, &sachld);
538 sa.sa_handler = SIG_IGN;
539 sigaction(SIGPIPE, &sa, &sapipe);
540
541 {
542 /* space for daemons to overwrite environment for ps */
543 #define DUMMYSIZE 100
544 char dummy[DUMMYSIZE];
545
546 (void)memset(dummy, 'x', DUMMYSIZE - 1);
547 dummy[DUMMYSIZE - 1] = '\0';
548 (void)setenv("inetd_dummy", dummy, 1);
549 }
550
551 if (pipe(signalpipe) != 0) {
552 syslog(LOG_ERR, "pipe: %m");
553 exit(EX_OSERR);
554 }
555 if (fcntl(signalpipe[0], F_SETFD, FD_CLOEXEC) < 0 ||
556 fcntl(signalpipe[1], F_SETFD, FD_CLOEXEC) < 0) {
557 syslog(LOG_ERR, "signalpipe: fcntl (F_SETFD, FD_CLOEXEC): %m");
558 exit(EX_OSERR);
559 }
560 FD_SET(signalpipe[0], &allsock);
561 #ifdef SANITY_CHECK
562 nsock++;
563 #endif
564 if (signalpipe[0] > maxsock)
565 maxsock = signalpipe[0];
566 if (signalpipe[1] > maxsock)
567 maxsock = signalpipe[1];
568
569 for (;;) {
570 int n, ctrl;
571 fd_set readable;
572
573 #ifdef SANITY_CHECK
574 if (nsock == 0) {
575 syslog(LOG_ERR, "%s: nsock=0", __func__);
576 exit(EX_SOFTWARE);
577 }
578 #endif
579 readable = allsock;
580 if ((n = select(maxsock + 1, &readable, (fd_set *)0,
581 (fd_set *)0, (struct timeval *)0)) <= 0) {
582 if (n < 0 && errno != EINTR) {
583 syslog(LOG_WARNING, "select: %m");
584 sleep(1);
585 }
586 continue;
587 }
588 /* handle any queued signal flags */
589 if (FD_ISSET(signalpipe[0], &readable)) {
590 int nsig;
591 if (ioctl(signalpipe[0], FIONREAD, &nsig) != 0) {
592 syslog(LOG_ERR, "ioctl: %m");
593 exit(EX_OSERR);
594 }
595 while (--nsig >= 0) {
596 char c;
597 if (read(signalpipe[0], &c, 1) != 1) {
598 syslog(LOG_ERR, "read: %m");
599 exit(EX_OSERR);
600 }
601 if (debug)
602 warnx("handling signal flag %c", c);
603 switch(c) {
604 case 'A': /* sigalrm */
605 retry();
606 break;
607 case 'C': /* sigchld */
608 reapchild();
609 break;
610 case 'H': /* sighup */
611 config();
612 break;
613 }
614 }
615 }
616 for (sep = servtab; n && sep; sep = sep->se_next)
617 if (sep->se_fd != -1 && FD_ISSET(sep->se_fd, &readable)) {
618 n--;
619 if (debug)
620 warnx("someone wants %s", sep->se_service);
621 dofork = !sep->se_bi || sep->se_bi->bi_fork || ISWRAP(sep);
622 conn = NULL;
623 if (sep->se_accept && sep->se_socktype == SOCK_STREAM) {
624 i = 1;
625 if (ioctl(sep->se_fd, FIONBIO, &i) < 0)
626 syslog(LOG_ERR, "ioctl (FIONBIO, 1): %m");
627 ctrl = accept(sep->se_fd, (struct sockaddr *)0,
628 (socklen_t *)0);
629 if (debug)
630 warnx("accept, ctrl %d", ctrl);
631 if (ctrl < 0) {
632 if (errno != EINTR)
633 syslog(LOG_WARNING,
634 "accept (for %s): %m",
635 sep->se_service);
636 if (sep->se_accept &&
637 sep->se_socktype == SOCK_STREAM)
638 close(ctrl);
639 continue;
640 }
641 i = 0;
642 if (ioctl(sep->se_fd, FIONBIO, &i) < 0)
643 syslog(LOG_ERR, "ioctl1(FIONBIO, 0): %m");
644 if (ioctl(ctrl, FIONBIO, &i) < 0)
645 syslog(LOG_ERR, "ioctl2(FIONBIO, 0): %m");
646 if (cpmip(sep, ctrl) < 0) {
647 close(ctrl);
648 continue;
649 }
650 if (dofork &&
651 (conn = search_conn(sep, ctrl)) != NULL &&
652 !room_conn(sep, conn)) {
653 close(ctrl);
654 continue;
655 }
656 } else
657 ctrl = sep->se_fd;
658 if (dolog && !ISWRAP(sep)) {
659 char pname[INET6_ADDRSTRLEN] = "unknown";
660 socklen_t sl;
661 sl = sizeof peermax;
662 if (getpeername(ctrl, (struct sockaddr *)
663 &peermax, &sl)) {
664 sl = sizeof peermax;
665 if (recvfrom(ctrl, buf, sizeof(buf),
666 MSG_PEEK,
667 (struct sockaddr *)&peermax,
668 &sl) >= 0) {
669 getnameinfo((struct sockaddr *)&peermax,
670 peer.sa_len,
671 pname, sizeof(pname),
672 NULL, 0, NI_NUMERICHOST);
673 }
674 } else {
675 getnameinfo((struct sockaddr *)&peermax,
676 peer.sa_len,
677 pname, sizeof(pname),
678 NULL, 0, NI_NUMERICHOST);
679 }
680 syslog(LOG_INFO,"%s from %s", sep->se_service, pname);
681 }
682 (void) sigblock(SIGBLOCK);
683 pid = 0;
684 /*
685 * Fork for all external services, builtins which need to
686 * fork and anything we're wrapping (as wrapping might
687 * block or use hosts_options(5) twist).
688 */
689 if (dofork) {
690 if (sep->se_count++ == 0)
691 (void)clock_gettime(CLOCK_MONOTONIC_FAST, &sep->se_time);
692 else if (toomany > 0 && sep->se_count >= toomany) {
693 struct timespec now;
694
695 (void)clock_gettime(CLOCK_MONOTONIC_FAST, &now);
696 if (now.tv_sec - sep->se_time.tv_sec >
697 CNT_INTVL) {
698 sep->se_time = now;
699 sep->se_count = 1;
700 } else {
701 syslog(LOG_ERR,
702 "%s/%s server failing (looping), service terminated",
703 sep->se_service, sep->se_proto);
704 if (sep->se_accept &&
705 sep->se_socktype == SOCK_STREAM)
706 close(ctrl);
707 close_sep(sep);
708 free_conn(conn);
709 sigsetmask(0L);
710 if (!timingout) {
711 timingout = 1;
712 alarm(RETRYTIME);
713 }
714 continue;
715 }
716 }
717 pid = fork();
718 }
719 if (pid < 0) {
720 syslog(LOG_ERR, "fork: %m");
721 if (sep->se_accept &&
722 sep->se_socktype == SOCK_STREAM)
723 close(ctrl);
724 free_conn(conn);
725 sigsetmask(0L);
726 sleep(1);
727 continue;
728 }
729 if (pid) {
730 addchild_conn(conn, pid);
731 addchild(sep, pid);
732 }
733 sigsetmask(0L);
734 if (pid == 0) {
735 pidfile_close(pfh);
736 if (dofork) {
737 sigaction(SIGALRM, &saalrm, (struct sigaction *)0);
738 sigaction(SIGCHLD, &sachld, (struct sigaction *)0);
739 sigaction(SIGHUP, &sahup, (struct sigaction *)0);
740 /* SIGPIPE reset before exec */
741 }
742 /*
743 * Call tcpmux to find the real service to exec.
744 */
745 if (sep->se_bi &&
746 sep->se_bi->bi_fn == (bi_fn_t *) tcpmux) {
747 sep = tcpmux(ctrl);
748 if (sep == NULL) {
749 close(ctrl);
750 _exit(0);
751 }
752 }
753 if (ISWRAP(sep)) {
754 inetd_setproctitle("wrapping", ctrl);
755 service = sep->se_server_name ?
756 sep->se_server_name : sep->se_service;
757 request_init(&req, RQ_DAEMON, service, RQ_FILE, ctrl, 0);
758 fromhost(&req);
759 deny_severity = LIBWRAP_DENY_FACILITY|LIBWRAP_DENY_SEVERITY;
760 allow_severity = LIBWRAP_ALLOW_FACILITY|LIBWRAP_ALLOW_SEVERITY;
761 denied = !hosts_access(&req);
762 if (denied) {
763 syslog(deny_severity,
764 "refused connection from %.500s, service %s (%s%s)",
765 eval_client(&req), service, sep->se_proto,
766 (whichaf(&req) == AF_INET6) ? "6" : "");
767 if (sep->se_socktype != SOCK_STREAM)
768 recv(ctrl, buf, sizeof (buf), 0);
769 if (dofork) {
770 sleep(1);
771 _exit(0);
772 }
773 }
774 if (dolog) {
775 syslog(allow_severity,
776 "connection from %.500s, service %s (%s%s)",
777 eval_client(&req), service, sep->se_proto,
778 (whichaf(&req) == AF_INET6) ? "6" : "");
779 }
780 }
781 if (sep->se_bi) {
782 (*sep->se_bi->bi_fn)(ctrl, sep);
783 } else {
784 if (debug)
785 warnx("%d execl %s",
786 getpid(), sep->se_server);
787 /* Clear close-on-exec. */
788 if (fcntl(ctrl, F_SETFD, 0) < 0) {
789 syslog(LOG_ERR,
790 "%s/%s: fcntl (F_SETFD, 0): %m",
791 sep->se_service, sep->se_proto);
792 _exit(EX_OSERR);
793 }
794 if (ctrl != 0) {
795 dup2(ctrl, 0);
796 close(ctrl);
797 }
798 dup2(0, 1);
799 dup2(0, 2);
800 if ((pwd = getpwnam(sep->se_user)) == NULL) {
801 syslog(LOG_ERR,
802 "%s/%s: %s: no such user",
803 sep->se_service, sep->se_proto,
804 sep->se_user);
805 if (sep->se_socktype != SOCK_STREAM)
806 recv(0, buf, sizeof (buf), 0);
807 _exit(EX_NOUSER);
808 }
809 grp = NULL;
810 if ( sep->se_group != NULL
811 && (grp = getgrnam(sep->se_group)) == NULL
812 ) {
813 syslog(LOG_ERR,
814 "%s/%s: %s: no such group",
815 sep->se_service, sep->se_proto,
816 sep->se_group);
817 if (sep->se_socktype != SOCK_STREAM)
818 recv(0, buf, sizeof (buf), 0);
819 _exit(EX_NOUSER);
820 }
821 if (grp != NULL)
822 pwd->pw_gid = grp->gr_gid;
823 #ifdef LOGIN_CAP
824 if ((lc = login_getclass(sep->se_class)) == NULL) {
825 /* error syslogged by getclass */
826 syslog(LOG_ERR,
827 "%s/%s: %s: login class error",
828 sep->se_service, sep->se_proto,
829 sep->se_class);
830 if (sep->se_socktype != SOCK_STREAM)
831 recv(0, buf, sizeof (buf), 0);
832 _exit(EX_NOUSER);
833 }
834 #endif
835 if (setsid() < 0) {
836 syslog(LOG_ERR,
837 "%s: can't setsid(): %m",
838 sep->se_service);
839 /* _exit(EX_OSERR); not fatal yet */
840 }
841 #ifdef LOGIN_CAP
842 if (setusercontext(lc, pwd, pwd->pw_uid,
843 LOGIN_SETALL & ~LOGIN_SETMAC)
844 != 0) {
845 syslog(LOG_ERR,
846 "%s: can't setusercontext(..%s..): %m",
847 sep->se_service, sep->se_user);
848 _exit(EX_OSERR);
849 }
850 login_close(lc);
851 #else
852 if (pwd->pw_uid) {
853 if (setlogin(sep->se_user) < 0) {
854 syslog(LOG_ERR,
855 "%s: can't setlogin(%s): %m",
856 sep->se_service, sep->se_user);
857 /* _exit(EX_OSERR); not yet */
858 }
859 if (setgid(pwd->pw_gid) < 0) {
860 syslog(LOG_ERR,
861 "%s: can't set gid %d: %m",
862 sep->se_service, pwd->pw_gid);
863 _exit(EX_OSERR);
864 }
865 (void) initgroups(pwd->pw_name,
866 pwd->pw_gid);
867 if (setuid(pwd->pw_uid) < 0) {
868 syslog(LOG_ERR,
869 "%s: can't set uid %d: %m",
870 sep->se_service, pwd->pw_uid);
871 _exit(EX_OSERR);
872 }
873 }
874 #endif
875 sigaction(SIGPIPE, &sapipe,
876 (struct sigaction *)0);
877 execv(sep->se_server, sep->se_argv);
878 syslog(LOG_ERR,
879 "cannot execute %s: %m", sep->se_server);
880 if (sep->se_socktype != SOCK_STREAM)
881 recv(0, buf, sizeof (buf), 0);
882 }
883 if (dofork)
884 _exit(0);
885 }
886 if (sep->se_accept && sep->se_socktype == SOCK_STREAM)
887 close(ctrl);
888 }
889 }
890 }
891
892 /*
893 * Add a signal flag to the signal flag queue for later handling
894 */
895
896 void
flag_signal(int c)897 flag_signal(int c)
898 {
899 char ch = c;
900
901 if (write(signalpipe[1], &ch, 1) != 1) {
902 syslog(LOG_ERR, "write: %m");
903 _exit(EX_OSERR);
904 }
905 }
906
907 /*
908 * Record a new child pid for this service. If we've reached the
909 * limit on children, then stop accepting incoming requests.
910 */
911
912 void
addchild(struct servtab * sep,pid_t pid)913 addchild(struct servtab *sep, pid_t pid)
914 {
915 if (sep->se_maxchild <= 0)
916 return;
917 #ifdef SANITY_CHECK
918 if (sep->se_numchild >= sep->se_maxchild) {
919 syslog(LOG_ERR, "%s: %d >= %d",
920 __func__, sep->se_numchild, sep->se_maxchild);
921 exit(EX_SOFTWARE);
922 }
923 #endif
924 sep->se_pids[sep->se_numchild++] = pid;
925 if (sep->se_numchild == sep->se_maxchild)
926 disable(sep);
927 }
928
929 /*
930 * Some child process has exited. See if it's on somebody's list.
931 */
932
933 void
flag_reapchild(int signo __unused)934 flag_reapchild(int signo __unused)
935 {
936 flag_signal('C');
937 }
938
939 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 void
flag_config(int signo __unused)978 flag_config(int signo __unused)
979 {
980 flag_signal('H');
981 }
982
983 void
config(void)984 config(void)
985 {
986 struct servtab *sep, *new, **sepp;
987 long omask;
988 int new_nomapped;
989 #ifdef LOGIN_CAP
990 login_cap_t *lc = NULL;
991 #endif
992
993 if (!setconfig()) {
994 syslog(LOG_ERR, "%s: %m", CONFIG);
995 return;
996 }
997 for (sep = servtab; sep; sep = sep->se_next)
998 sep->se_checked = 0;
999 while ((new = getconfigent())) {
1000 if (getpwnam(new->se_user) == NULL) {
1001 syslog(LOG_ERR,
1002 "%s/%s: no such user '%s', service ignored",
1003 new->se_service, new->se_proto, new->se_user);
1004 continue;
1005 }
1006 if (new->se_group && getgrnam(new->se_group) == NULL) {
1007 syslog(LOG_ERR,
1008 "%s/%s: no such group '%s', service ignored",
1009 new->se_service, new->se_proto, new->se_group);
1010 continue;
1011 }
1012 #ifdef LOGIN_CAP
1013 if ((lc = login_getclass(new->se_class)) == NULL) {
1014 /* error syslogged by getclass */
1015 syslog(LOG_ERR,
1016 "%s/%s: %s: login class error, service ignored",
1017 new->se_service, new->se_proto, new->se_class);
1018 continue;
1019 }
1020 login_close(lc);
1021 #endif
1022 new_nomapped = new->se_nomapped;
1023 for (sep = servtab; sep; sep = sep->se_next)
1024 if (strcmp(sep->se_service, new->se_service) == 0 &&
1025 strcmp(sep->se_proto, new->se_proto) == 0 &&
1026 sep->se_rpc == new->se_rpc &&
1027 sep->se_socktype == new->se_socktype &&
1028 sep->se_family == new->se_family)
1029 break;
1030 if (sep != 0) {
1031 int i;
1032
1033 #define SWAP(t,a, b) { t c = a; a = b; b = c; }
1034 omask = sigblock(SIGBLOCK);
1035 if (sep->se_nomapped != new->se_nomapped) {
1036 /* for rpc keep old nommaped till unregister */
1037 if (!sep->se_rpc)
1038 sep->se_nomapped = new->se_nomapped;
1039 sep->se_reset = 1;
1040 }
1041 /* copy over outstanding child pids */
1042 if (sep->se_maxchild > 0 && new->se_maxchild > 0) {
1043 new->se_numchild = sep->se_numchild;
1044 if (new->se_numchild > new->se_maxchild)
1045 new->se_numchild = new->se_maxchild;
1046 memcpy(new->se_pids, sep->se_pids,
1047 new->se_numchild * sizeof(*new->se_pids));
1048 }
1049 SWAP(pid_t *, sep->se_pids, new->se_pids);
1050 sep->se_maxchild = new->se_maxchild;
1051 sep->se_numchild = new->se_numchild;
1052 sep->se_maxcpm = new->se_maxcpm;
1053 resize_conn(sep, new->se_maxperip);
1054 sep->se_maxperip = new->se_maxperip;
1055 sep->se_bi = new->se_bi;
1056 /* might need to turn on or off service now */
1057 if (sep->se_fd >= 0) {
1058 if (sep->se_maxchild > 0
1059 && sep->se_numchild == sep->se_maxchild) {
1060 if (FD_ISSET(sep->se_fd, &allsock))
1061 disable(sep);
1062 } else {
1063 if (!FD_ISSET(sep->se_fd, &allsock))
1064 enable(sep);
1065 }
1066 }
1067 sep->se_accept = new->se_accept;
1068 SWAP(char *, sep->se_user, new->se_user);
1069 SWAP(char *, sep->se_group, new->se_group);
1070 #ifdef LOGIN_CAP
1071 SWAP(char *, sep->se_class, new->se_class);
1072 #endif
1073 SWAP(char *, sep->se_server, new->se_server);
1074 SWAP(char *, sep->se_server_name, new->se_server_name);
1075 for (i = 0; i < MAXARGV; i++)
1076 SWAP(char *, sep->se_argv[i], new->se_argv[i]);
1077 #ifdef IPSEC
1078 SWAP(char *, sep->se_policy, new->se_policy);
1079 ipsecsetup(sep);
1080 #endif
1081 sigsetmask(omask);
1082 freeconfig(new);
1083 if (debug)
1084 print_service("REDO", sep);
1085 } else {
1086 sep = enter(new);
1087 if (debug)
1088 print_service("ADD ", sep);
1089 }
1090 sep->se_checked = 1;
1091 if (ISMUX(sep)) {
1092 sep->se_fd = -1;
1093 continue;
1094 }
1095 switch (sep->se_family) {
1096 case AF_INET:
1097 if (!v4bind_ok) {
1098 sep->se_fd = -1;
1099 continue;
1100 }
1101 break;
1102 #ifdef INET6
1103 case AF_INET6:
1104 if (!v6bind_ok) {
1105 sep->se_fd = -1;
1106 continue;
1107 }
1108 break;
1109 #endif
1110 }
1111 if (!sep->se_rpc) {
1112 if (sep->se_family != AF_UNIX) {
1113 sp = getservbyname(sep->se_service, sep->se_proto);
1114 if (sp == 0) {
1115 syslog(LOG_ERR, "%s/%s: unknown service",
1116 sep->se_service, sep->se_proto);
1117 sep->se_checked = 0;
1118 continue;
1119 }
1120 }
1121 switch (sep->se_family) {
1122 case AF_INET:
1123 if (sp->s_port != sep->se_ctrladdr4.sin_port) {
1124 sep->se_ctrladdr4.sin_port =
1125 sp->s_port;
1126 sep->se_reset = 1;
1127 }
1128 break;
1129 #ifdef INET6
1130 case AF_INET6:
1131 if (sp->s_port !=
1132 sep->se_ctrladdr6.sin6_port) {
1133 sep->se_ctrladdr6.sin6_port =
1134 sp->s_port;
1135 sep->se_reset = 1;
1136 }
1137 break;
1138 #endif
1139 }
1140 if (sep->se_reset != 0 && sep->se_fd >= 0)
1141 close_sep(sep);
1142 } else {
1143 rpc = getrpcbyname(sep->se_service);
1144 if (rpc == 0) {
1145 syslog(LOG_ERR, "%s/%s unknown RPC service",
1146 sep->se_service, sep->se_proto);
1147 if (sep->se_fd != -1)
1148 (void) close(sep->se_fd);
1149 sep->se_fd = -1;
1150 continue;
1151 }
1152 if (sep->se_reset != 0 ||
1153 rpc->r_number != sep->se_rpc_prog) {
1154 if (sep->se_rpc_prog)
1155 unregisterrpc(sep);
1156 sep->se_rpc_prog = rpc->r_number;
1157 if (sep->se_fd != -1)
1158 (void) close(sep->se_fd);
1159 sep->se_fd = -1;
1160 }
1161 sep->se_nomapped = new_nomapped;
1162 }
1163 sep->se_reset = 0;
1164 if (sep->se_fd == -1)
1165 setup(sep);
1166 }
1167 endconfig();
1168 /*
1169 * Purge anything not looked at above.
1170 */
1171 omask = sigblock(SIGBLOCK);
1172 sepp = &servtab;
1173 while ((sep = *sepp)) {
1174 if (sep->se_checked) {
1175 sepp = &sep->se_next;
1176 continue;
1177 }
1178 *sepp = sep->se_next;
1179 if (sep->se_fd >= 0)
1180 close_sep(sep);
1181 if (debug)
1182 print_service("FREE", sep);
1183 if (sep->se_rpc && sep->se_rpc_prog > 0)
1184 unregisterrpc(sep);
1185 freeconfig(sep);
1186 free(sep);
1187 }
1188 (void) sigsetmask(omask);
1189 }
1190
1191 void
unregisterrpc(struct servtab * sep)1192 unregisterrpc(struct servtab *sep)
1193 {
1194 u_int i;
1195 struct servtab *sepp;
1196 long omask;
1197 struct netconfig *netid4, *netid6;
1198
1199 omask = sigblock(SIGBLOCK);
1200 netid4 = sep->se_socktype == SOCK_DGRAM ? udpconf : tcpconf;
1201 netid6 = sep->se_socktype == SOCK_DGRAM ? udp6conf : tcp6conf;
1202 if (sep->se_family == AF_INET)
1203 netid6 = NULL;
1204 else if (sep->se_nomapped)
1205 netid4 = NULL;
1206 /*
1207 * Conflict if same prog and protocol - In that case one should look
1208 * to versions, but it is not interesting: having separate servers for
1209 * different versions does not work well.
1210 * Therefore one do not unregister if there is a conflict.
1211 * There is also transport conflict if destroying INET when INET46
1212 * exists, or destroying INET46 when INET exists
1213 */
1214 for (sepp = servtab; sepp; sepp = sepp->se_next) {
1215 if (sepp == sep)
1216 continue;
1217 if (sepp->se_checked == 0 ||
1218 !sepp->se_rpc ||
1219 strcmp(sep->se_proto, sepp->se_proto) != 0 ||
1220 sep->se_rpc_prog != sepp->se_rpc_prog)
1221 continue;
1222 if (sepp->se_family == AF_INET)
1223 netid4 = NULL;
1224 if (sepp->se_family == AF_INET6) {
1225 netid6 = NULL;
1226 if (!sep->se_nomapped)
1227 netid4 = NULL;
1228 }
1229 if (netid4 == NULL && netid6 == NULL)
1230 return;
1231 }
1232 if (debug)
1233 print_service("UNREG", sep);
1234 for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++) {
1235 if (netid4)
1236 rpcb_unset(sep->se_rpc_prog, i, netid4);
1237 if (netid6)
1238 rpcb_unset(sep->se_rpc_prog, i, netid6);
1239 }
1240 if (sep->se_fd != -1)
1241 (void) close(sep->se_fd);
1242 sep->se_fd = -1;
1243 (void) sigsetmask(omask);
1244 }
1245
1246 void
flag_retry(int signo __unused)1247 flag_retry(int signo __unused)
1248 {
1249 flag_signal('A');
1250 }
1251
1252 void
retry(void)1253 retry(void)
1254 {
1255 struct servtab *sep;
1256
1257 timingout = 0;
1258 for (sep = servtab; sep; sep = sep->se_next)
1259 if (sep->se_fd == -1 && !ISMUX(sep))
1260 setup(sep);
1261 }
1262
1263 void
setup(struct servtab * sep)1264 setup(struct servtab *sep)
1265 {
1266 int on = 1;
1267
1268 if ((sep->se_fd = socket(sep->se_family, sep->se_socktype, 0)) < 0) {
1269 if (debug)
1270 warn("socket failed on %s/%s",
1271 sep->se_service, sep->se_proto);
1272 syslog(LOG_ERR, "%s/%s: socket: %m",
1273 sep->se_service, sep->se_proto);
1274 return;
1275 }
1276 /* Set all listening sockets to close-on-exec. */
1277 if (fcntl(sep->se_fd, F_SETFD, FD_CLOEXEC) < 0) {
1278 syslog(LOG_ERR, "%s/%s: fcntl (F_SETFD, FD_CLOEXEC): %m",
1279 sep->se_service, sep->se_proto);
1280 close(sep->se_fd);
1281 return;
1282 }
1283 #define turnon(fd, opt) \
1284 setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on))
1285 if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) &&
1286 turnon(sep->se_fd, SO_DEBUG) < 0)
1287 syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m");
1288 if (turnon(sep->se_fd, SO_REUSEADDR) < 0)
1289 syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m");
1290 #ifdef SO_PRIVSTATE
1291 if (turnon(sep->se_fd, SO_PRIVSTATE) < 0)
1292 syslog(LOG_ERR, "setsockopt (SO_PRIVSTATE): %m");
1293 #endif
1294 /* tftpd opens a new connection then needs more infos */
1295 if ((sep->se_family == AF_INET6) &&
1296 (strcmp(sep->se_proto, "udp") == 0) &&
1297 (sep->se_accept == 0) &&
1298 (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_RECVPKTINFO,
1299 (char *)&on, sizeof (on)) < 0))
1300 syslog(LOG_ERR, "setsockopt (IPV6_RECVPKTINFO): %m");
1301 if (sep->se_family == AF_INET6) {
1302 int flag = sep->se_nomapped ? 1 : 0;
1303 if (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_V6ONLY,
1304 (char *)&flag, sizeof (flag)) < 0)
1305 syslog(LOG_ERR, "setsockopt (IPV6_V6ONLY): %m");
1306 }
1307 #undef turnon
1308 #ifdef IPV6_FAITH
1309 if (sep->se_type == FAITH_TYPE) {
1310 if (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_FAITH, &on,
1311 sizeof(on)) < 0) {
1312 syslog(LOG_ERR, "setsockopt (IPV6_FAITH): %m");
1313 }
1314 }
1315 #endif
1316 #ifdef IPSEC
1317 ipsecsetup(sep);
1318 #endif
1319 if (sep->se_family == AF_UNIX) {
1320 (void) unlink(sep->se_ctrladdr_un.sun_path);
1321 umask(0777); /* Make socket with conservative permissions */
1322 }
1323 if (bind(sep->se_fd, (struct sockaddr *)&sep->se_ctrladdr,
1324 sep->se_ctrladdr_size) < 0) {
1325 if (debug)
1326 warn("bind failed on %s/%s",
1327 sep->se_service, sep->se_proto);
1328 syslog(LOG_ERR, "%s/%s: bind: %m",
1329 sep->se_service, sep->se_proto);
1330 (void) close(sep->se_fd);
1331 sep->se_fd = -1;
1332 if (!timingout) {
1333 timingout = 1;
1334 alarm(RETRYTIME);
1335 }
1336 if (sep->se_family == AF_UNIX)
1337 umask(mask);
1338 return;
1339 }
1340 if (sep->se_family == AF_UNIX) {
1341 /* Ick - fch{own,mod} don't work on Unix domain sockets */
1342 if (chown(sep->se_service, sep->se_sockuid, sep->se_sockgid) < 0)
1343 syslog(LOG_ERR, "chown socket: %m");
1344 if (chmod(sep->se_service, sep->se_sockmode) < 0)
1345 syslog(LOG_ERR, "chmod socket: %m");
1346 umask(mask);
1347 }
1348 if (sep->se_rpc) {
1349 u_int i;
1350 socklen_t len = sep->se_ctrladdr_size;
1351 struct netconfig *netid, *netid2 = NULL;
1352 struct sockaddr_in sock;
1353 struct netbuf nbuf, nbuf2;
1354
1355 if (getsockname(sep->se_fd,
1356 (struct sockaddr*)&sep->se_ctrladdr, &len) < 0){
1357 syslog(LOG_ERR, "%s/%s: getsockname: %m",
1358 sep->se_service, sep->se_proto);
1359 (void) close(sep->se_fd);
1360 sep->se_fd = -1;
1361 return;
1362 }
1363 nbuf.buf = &sep->se_ctrladdr;
1364 nbuf.len = sep->se_ctrladdr.sa_len;
1365 if (sep->se_family == AF_INET)
1366 netid = sep->se_socktype==SOCK_DGRAM? udpconf:tcpconf;
1367 else {
1368 netid = sep->se_socktype==SOCK_DGRAM? udp6conf:tcp6conf;
1369 if (!sep->se_nomapped) { /* INET and INET6 */
1370 netid2 = netid==udp6conf? udpconf:tcpconf;
1371 memset(&sock, 0, sizeof sock); /* ADDR_ANY */
1372 nbuf2.buf = &sock;
1373 nbuf2.len = sock.sin_len = sizeof sock;
1374 sock.sin_family = AF_INET;
1375 sock.sin_port = sep->se_ctrladdr6.sin6_port;
1376 }
1377 }
1378 if (debug)
1379 print_service("REG ", sep);
1380 for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++) {
1381 rpcb_unset(sep->se_rpc_prog, i, netid);
1382 rpcb_set(sep->se_rpc_prog, i, netid, &nbuf);
1383 if (netid2) {
1384 rpcb_unset(sep->se_rpc_prog, i, netid2);
1385 rpcb_set(sep->se_rpc_prog, i, netid2, &nbuf2);
1386 }
1387 }
1388 }
1389 if (sep->se_socktype == SOCK_STREAM)
1390 listen(sep->se_fd, -1);
1391 enable(sep);
1392 if (debug) {
1393 warnx("registered %s on %d",
1394 sep->se_server, sep->se_fd);
1395 }
1396 }
1397
1398 #ifdef IPSEC
1399 void
ipsecsetup(struct servtab * sep)1400 ipsecsetup(struct servtab *sep)
1401 {
1402 char *buf;
1403 char *policy_in = NULL;
1404 char *policy_out = NULL;
1405 int level;
1406 int opt;
1407
1408 switch (sep->se_family) {
1409 case AF_INET:
1410 level = IPPROTO_IP;
1411 opt = IP_IPSEC_POLICY;
1412 break;
1413 #ifdef INET6
1414 case AF_INET6:
1415 level = IPPROTO_IPV6;
1416 opt = IPV6_IPSEC_POLICY;
1417 break;
1418 #endif
1419 default:
1420 return;
1421 }
1422
1423 if (!sep->se_policy || sep->se_policy[0] == '\0') {
1424 static char def_in[] = "in entrust", def_out[] = "out entrust";
1425 policy_in = def_in;
1426 policy_out = def_out;
1427 } else {
1428 if (!strncmp("in", sep->se_policy, 2))
1429 policy_in = sep->se_policy;
1430 else if (!strncmp("out", sep->se_policy, 3))
1431 policy_out = sep->se_policy;
1432 else {
1433 syslog(LOG_ERR, "invalid security policy \"%s\"",
1434 sep->se_policy);
1435 return;
1436 }
1437 }
1438
1439 if (policy_in != NULL) {
1440 buf = ipsec_set_policy(policy_in, strlen(policy_in));
1441 if (buf != NULL) {
1442 if (setsockopt(sep->se_fd, level, opt,
1443 buf, ipsec_get_policylen(buf)) < 0 &&
1444 debug != 0)
1445 warnx("%s/%s: ipsec initialization failed; %s",
1446 sep->se_service, sep->se_proto,
1447 policy_in);
1448 free(buf);
1449 } else
1450 syslog(LOG_ERR, "invalid security policy \"%s\"",
1451 policy_in);
1452 }
1453 if (policy_out != NULL) {
1454 buf = ipsec_set_policy(policy_out, strlen(policy_out));
1455 if (buf != NULL) {
1456 if (setsockopt(sep->se_fd, level, opt,
1457 buf, ipsec_get_policylen(buf)) < 0 &&
1458 debug != 0)
1459 warnx("%s/%s: ipsec initialization failed; %s",
1460 sep->se_service, sep->se_proto,
1461 policy_out);
1462 free(buf);
1463 } else
1464 syslog(LOG_ERR, "invalid security policy \"%s\"",
1465 policy_out);
1466 }
1467 }
1468 #endif
1469
1470 /*
1471 * Finish with a service and its socket.
1472 */
1473 void
close_sep(struct servtab * sep)1474 close_sep(struct servtab *sep)
1475 {
1476 if (sep->se_fd >= 0) {
1477 if (FD_ISSET(sep->se_fd, &allsock))
1478 disable(sep);
1479 (void) close(sep->se_fd);
1480 sep->se_fd = -1;
1481 }
1482 sep->se_count = 0;
1483 sep->se_numchild = 0; /* forget about any existing children */
1484 }
1485
1486 int
matchservent(const char * name1,const char * name2,const char * proto)1487 matchservent(const char *name1, const char *name2, const char *proto)
1488 {
1489 char **alias, *p;
1490 struct servent *se;
1491
1492 if (strcmp(proto, "unix") == 0) {
1493 if ((p = strrchr(name1, '/')) != NULL)
1494 name1 = p + 1;
1495 if ((p = strrchr(name2, '/')) != NULL)
1496 name2 = p + 1;
1497 }
1498 if (strcmp(name1, name2) == 0)
1499 return(1);
1500 if ((se = getservbyname(name1, proto)) != NULL) {
1501 if (strcmp(name2, se->s_name) == 0)
1502 return(1);
1503 for (alias = se->s_aliases; *alias; alias++)
1504 if (strcmp(name2, *alias) == 0)
1505 return(1);
1506 }
1507 return(0);
1508 }
1509
1510 struct servtab *
enter(struct servtab * cp)1511 enter(struct servtab *cp)
1512 {
1513 struct servtab *sep;
1514 long omask;
1515
1516 sep = (struct servtab *)malloc(sizeof (*sep));
1517 if (sep == (struct servtab *)0) {
1518 syslog(LOG_ERR, "malloc: %m");
1519 exit(EX_OSERR);
1520 }
1521 *sep = *cp;
1522 sep->se_fd = -1;
1523 omask = sigblock(SIGBLOCK);
1524 sep->se_next = servtab;
1525 servtab = sep;
1526 sigsetmask(omask);
1527 return (sep);
1528 }
1529
1530 void
enable(struct servtab * sep)1531 enable(struct servtab *sep)
1532 {
1533 if (debug)
1534 warnx(
1535 "enabling %s, fd %d", sep->se_service, sep->se_fd);
1536 #ifdef SANITY_CHECK
1537 if (sep->se_fd < 0) {
1538 syslog(LOG_ERR,
1539 "%s: %s: bad fd", __func__, sep->se_service);
1540 exit(EX_SOFTWARE);
1541 }
1542 if (ISMUX(sep)) {
1543 syslog(LOG_ERR,
1544 "%s: %s: is mux", __func__, sep->se_service);
1545 exit(EX_SOFTWARE);
1546 }
1547 if (FD_ISSET(sep->se_fd, &allsock)) {
1548 syslog(LOG_ERR,
1549 "%s: %s: not off", __func__, sep->se_service);
1550 exit(EX_SOFTWARE);
1551 }
1552 nsock++;
1553 #endif
1554 FD_SET(sep->se_fd, &allsock);
1555 if (sep->se_fd > maxsock)
1556 maxsock = sep->se_fd;
1557 }
1558
1559 void
disable(struct servtab * sep)1560 disable(struct servtab *sep)
1561 {
1562 if (debug)
1563 warnx(
1564 "disabling %s, fd %d", sep->se_service, sep->se_fd);
1565 #ifdef SANITY_CHECK
1566 if (sep->se_fd < 0) {
1567 syslog(LOG_ERR,
1568 "%s: %s: bad fd", __func__, sep->se_service);
1569 exit(EX_SOFTWARE);
1570 }
1571 if (ISMUX(sep)) {
1572 syslog(LOG_ERR,
1573 "%s: %s: is mux", __func__, sep->se_service);
1574 exit(EX_SOFTWARE);
1575 }
1576 if (!FD_ISSET(sep->se_fd, &allsock)) {
1577 syslog(LOG_ERR,
1578 "%s: %s: not on", __func__, sep->se_service);
1579 exit(EX_SOFTWARE);
1580 }
1581 if (nsock == 0) {
1582 syslog(LOG_ERR, "%s: nsock=0", __func__);
1583 exit(EX_SOFTWARE);
1584 }
1585 nsock--;
1586 #endif
1587 FD_CLR(sep->se_fd, &allsock);
1588 if (sep->se_fd == maxsock)
1589 maxsock--;
1590 }
1591
1592 FILE *fconfig = NULL;
1593 struct servtab serv;
1594 char line[LINE_MAX];
1595
1596 int
setconfig(void)1597 setconfig(void)
1598 {
1599
1600 if (fconfig != NULL) {
1601 fseek(fconfig, 0L, SEEK_SET);
1602 return (1);
1603 }
1604 fconfig = fopen(CONFIG, "r");
1605 return (fconfig != NULL);
1606 }
1607
1608 void
endconfig(void)1609 endconfig(void)
1610 {
1611 if (fconfig) {
1612 (void) fclose(fconfig);
1613 fconfig = NULL;
1614 }
1615 }
1616
1617 struct servtab *
getconfigent(void)1618 getconfigent(void)
1619 {
1620 struct servtab *sep = &serv;
1621 int argc;
1622 char *cp, *arg, *s;
1623 char *versp;
1624 static char TCPMUX_TOKEN[] = "tcpmux/";
1625 #define MUX_LEN (sizeof(TCPMUX_TOKEN)-1)
1626 #ifdef IPSEC
1627 char *policy;
1628 #endif
1629 int v4bind;
1630 #ifdef INET6
1631 int v6bind;
1632 #endif
1633 int i;
1634
1635 #ifdef IPSEC
1636 policy = NULL;
1637 #endif
1638 more:
1639 v4bind = 0;
1640 #ifdef INET6
1641 v6bind = 0;
1642 #endif
1643 while ((cp = nextline(fconfig)) != NULL) {
1644 #ifdef IPSEC
1645 /* lines starting with #@ is not a comment, but the policy */
1646 if (cp[0] == '#' && cp[1] == '@') {
1647 char *p;
1648 for (p = cp + 2; p && *p && isspace(*p); p++)
1649 ;
1650 if (*p == '\0') {
1651 if (policy)
1652 free(policy);
1653 policy = NULL;
1654 } else if (ipsec_get_policylen(p) >= 0) {
1655 if (policy)
1656 free(policy);
1657 policy = newstr(p);
1658 } else {
1659 syslog(LOG_ERR,
1660 "%s: invalid ipsec policy \"%s\"",
1661 CONFIG, p);
1662 exit(EX_CONFIG);
1663 }
1664 }
1665 #endif
1666 if (*cp == '#' || *cp == '\0')
1667 continue;
1668 break;
1669 }
1670 if (cp == NULL)
1671 return ((struct servtab *)0);
1672 /*
1673 * clear the static buffer, since some fields (se_ctrladdr,
1674 * for example) don't get initialized here.
1675 */
1676 memset(sep, 0, sizeof *sep);
1677 arg = skip(&cp);
1678 if (cp == NULL) {
1679 /* got an empty line containing just blanks/tabs. */
1680 goto more;
1681 }
1682 if (arg[0] == ':') { /* :user:group:perm: */
1683 char *user, *group, *perm;
1684 struct passwd *pw;
1685 struct group *gr;
1686 user = arg+1;
1687 if ((group = strchr(user, ':')) == NULL) {
1688 syslog(LOG_ERR, "no group after user '%s'", user);
1689 goto more;
1690 }
1691 *group++ = '\0';
1692 if ((perm = strchr(group, ':')) == NULL) {
1693 syslog(LOG_ERR, "no mode after group '%s'", group);
1694 goto more;
1695 }
1696 *perm++ = '\0';
1697 if ((pw = getpwnam(user)) == NULL) {
1698 syslog(LOG_ERR, "no such user '%s'", user);
1699 goto more;
1700 }
1701 sep->se_sockuid = pw->pw_uid;
1702 if ((gr = getgrnam(group)) == NULL) {
1703 syslog(LOG_ERR, "no such user '%s'", group);
1704 goto more;
1705 }
1706 sep->se_sockgid = gr->gr_gid;
1707 sep->se_sockmode = strtol(perm, &arg, 8);
1708 if (*arg != ':') {
1709 syslog(LOG_ERR, "bad mode '%s'", perm);
1710 goto more;
1711 }
1712 *arg++ = '\0';
1713 } else {
1714 sep->se_sockuid = euid;
1715 sep->se_sockgid = egid;
1716 sep->se_sockmode = 0200;
1717 }
1718 if (strncmp(arg, TCPMUX_TOKEN, MUX_LEN) == 0) {
1719 char *c = arg + MUX_LEN;
1720 if (*c == '+') {
1721 sep->se_type = MUXPLUS_TYPE;
1722 c++;
1723 } else
1724 sep->se_type = MUX_TYPE;
1725 sep->se_service = newstr(c);
1726 } else {
1727 sep->se_service = newstr(arg);
1728 sep->se_type = NORM_TYPE;
1729 }
1730 arg = sskip(&cp);
1731 if (strcmp(arg, "stream") == 0)
1732 sep->se_socktype = SOCK_STREAM;
1733 else if (strcmp(arg, "dgram") == 0)
1734 sep->se_socktype = SOCK_DGRAM;
1735 else if (strcmp(arg, "rdm") == 0)
1736 sep->se_socktype = SOCK_RDM;
1737 else if (strcmp(arg, "seqpacket") == 0)
1738 sep->se_socktype = SOCK_SEQPACKET;
1739 else if (strcmp(arg, "raw") == 0)
1740 sep->se_socktype = SOCK_RAW;
1741 else
1742 sep->se_socktype = -1;
1743
1744 arg = sskip(&cp);
1745 if (strncmp(arg, "tcp", 3) == 0) {
1746 sep->se_proto = newstr(strsep(&arg, "/"));
1747 if (arg != NULL) {
1748 if (strcmp(arg, "faith") == 0)
1749 sep->se_type = FAITH_TYPE;
1750 }
1751 } else {
1752 if (sep->se_type == NORM_TYPE &&
1753 strncmp(arg, "faith/", 6) == 0) {
1754 arg += 6;
1755 sep->se_type = FAITH_TYPE;
1756 }
1757 sep->se_proto = newstr(arg);
1758 }
1759 if (strncmp(sep->se_proto, "rpc/", 4) == 0) {
1760 memmove(sep->se_proto, sep->se_proto + 4,
1761 strlen(sep->se_proto) + 1 - 4);
1762 sep->se_rpc = 1;
1763 sep->se_rpc_prog = sep->se_rpc_lowvers =
1764 sep->se_rpc_lowvers = 0;
1765 memcpy(&sep->se_ctrladdr4, bind_sa4,
1766 sizeof(sep->se_ctrladdr4));
1767 if ((versp = rindex(sep->se_service, '/'))) {
1768 *versp++ = '\0';
1769 switch (sscanf(versp, "%u-%u",
1770 &sep->se_rpc_lowvers,
1771 &sep->se_rpc_highvers)) {
1772 case 2:
1773 break;
1774 case 1:
1775 sep->se_rpc_highvers =
1776 sep->se_rpc_lowvers;
1777 break;
1778 default:
1779 syslog(LOG_ERR,
1780 "bad RPC version specifier; %s",
1781 sep->se_service);
1782 freeconfig(sep);
1783 goto more;
1784 }
1785 }
1786 else {
1787 sep->se_rpc_lowvers =
1788 sep->se_rpc_highvers = 1;
1789 }
1790 }
1791 sep->se_nomapped = 0;
1792 if (strcmp(sep->se_proto, "unix") == 0) {
1793 sep->se_family = AF_UNIX;
1794 } else {
1795 while (isdigit(sep->se_proto[strlen(sep->se_proto) - 1])) {
1796 #ifdef INET6
1797 if (sep->se_proto[strlen(sep->se_proto) - 1] == '6') {
1798 sep->se_proto[strlen(sep->se_proto) - 1] = '\0';
1799 v6bind = 1;
1800 continue;
1801 }
1802 #endif
1803 if (sep->se_proto[strlen(sep->se_proto) - 1] == '4') {
1804 sep->se_proto[strlen(sep->se_proto) - 1] = '\0';
1805 v4bind = 1;
1806 continue;
1807 }
1808 /* illegal version num */
1809 syslog(LOG_ERR, "bad IP version for %s", sep->se_proto);
1810 freeconfig(sep);
1811 goto more;
1812 }
1813 #ifdef INET6
1814 if (v6bind && !v6bind_ok) {
1815 syslog(LOG_INFO, "IPv6 bind is ignored for %s",
1816 sep->se_service);
1817 if (v4bind && v4bind_ok)
1818 v6bind = 0;
1819 else {
1820 freeconfig(sep);
1821 goto more;
1822 }
1823 }
1824 if (v6bind) {
1825 sep->se_family = AF_INET6;
1826 if (!v4bind || !v4bind_ok)
1827 sep->se_nomapped = 1;
1828 } else
1829 #endif
1830 { /* default to v4 bind if not v6 bind */
1831 if (!v4bind_ok) {
1832 syslog(LOG_NOTICE, "IPv4 bind is ignored for %s",
1833 sep->se_service);
1834 freeconfig(sep);
1835 goto more;
1836 }
1837 sep->se_family = AF_INET;
1838 }
1839 }
1840 /* init ctladdr */
1841 switch(sep->se_family) {
1842 case AF_INET:
1843 memcpy(&sep->se_ctrladdr4, bind_sa4,
1844 sizeof(sep->se_ctrladdr4));
1845 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr4);
1846 break;
1847 #ifdef INET6
1848 case AF_INET6:
1849 memcpy(&sep->se_ctrladdr6, bind_sa6,
1850 sizeof(sep->se_ctrladdr6));
1851 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr6);
1852 break;
1853 #endif
1854 case AF_UNIX:
1855 if (strlen(sep->se_service) >= sizeof(sep->se_ctrladdr_un.sun_path)) {
1856 syslog(LOG_ERR,
1857 "domain socket pathname too long for service %s",
1858 sep->se_service);
1859 goto more;
1860 }
1861 memset(&sep->se_ctrladdr, 0, sizeof(sep->se_ctrladdr));
1862 sep->se_ctrladdr_un.sun_family = sep->se_family;
1863 sep->se_ctrladdr_un.sun_len = strlen(sep->se_service);
1864 strcpy(sep->se_ctrladdr_un.sun_path, sep->se_service);
1865 sep->se_ctrladdr_size = SUN_LEN(&sep->se_ctrladdr_un);
1866 }
1867 arg = sskip(&cp);
1868 if (!strncmp(arg, "wait", 4))
1869 sep->se_accept = 0;
1870 else if (!strncmp(arg, "nowait", 6))
1871 sep->se_accept = 1;
1872 else {
1873 syslog(LOG_ERR,
1874 "%s: bad wait/nowait for service %s",
1875 CONFIG, sep->se_service);
1876 goto more;
1877 }
1878 sep->se_maxchild = -1;
1879 sep->se_maxcpm = -1;
1880 sep->se_maxperip = -1;
1881 if ((s = strchr(arg, '/')) != NULL) {
1882 char *eptr;
1883 u_long val;
1884
1885 val = strtoul(s + 1, &eptr, 10);
1886 if (eptr == s + 1 || val > MAX_MAXCHLD) {
1887 syslog(LOG_ERR,
1888 "%s: bad max-child for service %s",
1889 CONFIG, sep->se_service);
1890 goto more;
1891 }
1892 if (debug)
1893 if (!sep->se_accept && val != 1)
1894 warnx("maxchild=%lu for wait service %s"
1895 " not recommended", val, sep->se_service);
1896 sep->se_maxchild = val;
1897 if (*eptr == '/')
1898 sep->se_maxcpm = strtol(eptr + 1, &eptr, 10);
1899 if (*eptr == '/')
1900 sep->se_maxperip = strtol(eptr + 1, &eptr, 10);
1901 /*
1902 * explicitly do not check for \0 for future expansion /
1903 * backwards compatibility
1904 */
1905 }
1906 if (ISMUX(sep)) {
1907 /*
1908 * Silently enforce "nowait" mode for TCPMUX services
1909 * since they don't have an assigned port to listen on.
1910 */
1911 sep->se_accept = 1;
1912 if (strcmp(sep->se_proto, "tcp")) {
1913 syslog(LOG_ERR,
1914 "%s: bad protocol for tcpmux service %s",
1915 CONFIG, sep->se_service);
1916 goto more;
1917 }
1918 if (sep->se_socktype != SOCK_STREAM) {
1919 syslog(LOG_ERR,
1920 "%s: bad socket type for tcpmux service %s",
1921 CONFIG, sep->se_service);
1922 goto more;
1923 }
1924 }
1925 sep->se_user = newstr(sskip(&cp));
1926 #ifdef LOGIN_CAP
1927 if ((s = strrchr(sep->se_user, '/')) != NULL) {
1928 *s = '\0';
1929 sep->se_class = newstr(s + 1);
1930 } else
1931 sep->se_class = newstr(RESOURCE_RC);
1932 #endif
1933 if ((s = strrchr(sep->se_user, ':')) != NULL) {
1934 *s = '\0';
1935 sep->se_group = newstr(s + 1);
1936 } else
1937 sep->se_group = NULL;
1938 sep->se_server = newstr(sskip(&cp));
1939 if ((sep->se_server_name = rindex(sep->se_server, '/')))
1940 sep->se_server_name++;
1941 if (strcmp(sep->se_server, "internal") == 0) {
1942 struct biltin *bi;
1943
1944 for (bi = biltins; bi->bi_service; bi++)
1945 if (bi->bi_socktype == sep->se_socktype &&
1946 matchservent(bi->bi_service, sep->se_service,
1947 sep->se_proto))
1948 break;
1949 if (bi->bi_service == 0) {
1950 syslog(LOG_ERR, "internal service %s unknown",
1951 sep->se_service);
1952 goto more;
1953 }
1954 sep->se_accept = 1; /* force accept mode for built-ins */
1955 sep->se_bi = bi;
1956 } else
1957 sep->se_bi = NULL;
1958 if (sep->se_maxperip < 0)
1959 sep->se_maxperip = maxperip;
1960 if (sep->se_maxcpm < 0)
1961 sep->se_maxcpm = maxcpm;
1962 if (sep->se_maxchild < 0) { /* apply default max-children */
1963 if (sep->se_bi && sep->se_bi->bi_maxchild >= 0)
1964 sep->se_maxchild = sep->se_bi->bi_maxchild;
1965 else if (sep->se_accept)
1966 sep->se_maxchild = maxchild > 0 ? maxchild : 0;
1967 else
1968 sep->se_maxchild = 1;
1969 }
1970 if (sep->se_maxchild > 0) {
1971 sep->se_pids = malloc(sep->se_maxchild * sizeof(*sep->se_pids));
1972 if (sep->se_pids == NULL) {
1973 syslog(LOG_ERR, "malloc: %m");
1974 exit(EX_OSERR);
1975 }
1976 }
1977 argc = 0;
1978 for (arg = skip(&cp); cp; arg = skip(&cp))
1979 if (argc < MAXARGV) {
1980 sep->se_argv[argc++] = newstr(arg);
1981 } else {
1982 syslog(LOG_ERR,
1983 "%s: too many arguments for service %s",
1984 CONFIG, sep->se_service);
1985 goto more;
1986 }
1987 while (argc <= MAXARGV)
1988 sep->se_argv[argc++] = NULL;
1989 for (i = 0; i < PERIPSIZE; ++i)
1990 LIST_INIT(&sep->se_conn[i]);
1991 #ifdef IPSEC
1992 sep->se_policy = policy ? newstr(policy) : NULL;
1993 #endif
1994 return (sep);
1995 }
1996
1997 void
freeconfig(struct servtab * cp)1998 freeconfig(struct servtab *cp)
1999 {
2000 int i;
2001
2002 if (cp->se_service)
2003 free(cp->se_service);
2004 if (cp->se_proto)
2005 free(cp->se_proto);
2006 if (cp->se_user)
2007 free(cp->se_user);
2008 if (cp->se_group)
2009 free(cp->se_group);
2010 #ifdef LOGIN_CAP
2011 if (cp->se_class)
2012 free(cp->se_class);
2013 #endif
2014 if (cp->se_server)
2015 free(cp->se_server);
2016 if (cp->se_pids)
2017 free(cp->se_pids);
2018 for (i = 0; i < MAXARGV; i++)
2019 if (cp->se_argv[i])
2020 free(cp->se_argv[i]);
2021 free_connlist(cp);
2022 #ifdef IPSEC
2023 if (cp->se_policy)
2024 free(cp->se_policy);
2025 #endif
2026 }
2027
2028
2029 /*
2030 * Safe skip - if skip returns null, log a syntax error in the
2031 * configuration file and exit.
2032 */
2033 char *
sskip(char ** cpp)2034 sskip(char **cpp)
2035 {
2036 char *cp;
2037
2038 cp = skip(cpp);
2039 if (cp == NULL) {
2040 syslog(LOG_ERR, "%s: syntax error", CONFIG);
2041 exit(EX_DATAERR);
2042 }
2043 return (cp);
2044 }
2045
2046 char *
skip(char ** cpp)2047 skip(char **cpp)
2048 {
2049 char *cp = *cpp;
2050 char *start;
2051 char quote = '\0';
2052
2053 again:
2054 while (*cp == ' ' || *cp == '\t')
2055 cp++;
2056 if (*cp == '\0') {
2057 int c;
2058
2059 c = getc(fconfig);
2060 (void) ungetc(c, fconfig);
2061 if (c == ' ' || c == '\t')
2062 if ((cp = nextline(fconfig)))
2063 goto again;
2064 *cpp = (char *)0;
2065 return ((char *)0);
2066 }
2067 if (*cp == '"' || *cp == '\'')
2068 quote = *cp++;
2069 start = cp;
2070 if (quote)
2071 while (*cp && *cp != quote)
2072 cp++;
2073 else
2074 while (*cp && *cp != ' ' && *cp != '\t')
2075 cp++;
2076 if (*cp != '\0')
2077 *cp++ = '\0';
2078 *cpp = cp;
2079 return (start);
2080 }
2081
2082 char *
nextline(FILE * fd)2083 nextline(FILE *fd)
2084 {
2085 char *cp;
2086
2087 if (fgets(line, sizeof (line), fd) == NULL)
2088 return ((char *)0);
2089 cp = strchr(line, '\n');
2090 if (cp)
2091 *cp = '\0';
2092 return (line);
2093 }
2094
2095 char *
newstr(const char * cp)2096 newstr(const char *cp)
2097 {
2098 char *cr;
2099
2100 if ((cr = strdup(cp != NULL ? cp : "")))
2101 return (cr);
2102 syslog(LOG_ERR, "strdup: %m");
2103 exit(EX_OSERR);
2104 }
2105
2106 void
inetd_setproctitle(const char * a,int s)2107 inetd_setproctitle(const char *a, int s)
2108 {
2109 socklen_t size;
2110 struct sockaddr_storage ss;
2111 char buf[80], pbuf[INET6_ADDRSTRLEN];
2112
2113 size = sizeof(ss);
2114 if (getpeername(s, (struct sockaddr *)&ss, &size) == 0) {
2115 getnameinfo((struct sockaddr *)&ss, size, pbuf, sizeof(pbuf),
2116 NULL, 0, NI_NUMERICHOST);
2117 (void) sprintf(buf, "%s [%s]", a, pbuf);
2118 } else
2119 (void) sprintf(buf, "%s", a);
2120 setproctitle("%s", buf);
2121 }
2122
2123 int
check_loop(const struct sockaddr * sa,const struct servtab * sep)2124 check_loop(const struct sockaddr *sa, const struct servtab *sep)
2125 {
2126 struct servtab *se2;
2127 char pname[INET6_ADDRSTRLEN];
2128
2129 for (se2 = servtab; se2; se2 = se2->se_next) {
2130 if (!se2->se_bi || se2->se_socktype != SOCK_DGRAM)
2131 continue;
2132
2133 switch (se2->se_family) {
2134 case AF_INET:
2135 if (((const struct sockaddr_in *)sa)->sin_port ==
2136 se2->se_ctrladdr4.sin_port)
2137 goto isloop;
2138 continue;
2139 #ifdef INET6
2140 case AF_INET6:
2141 if (((const struct sockaddr_in *)sa)->sin_port ==
2142 se2->se_ctrladdr4.sin_port)
2143 goto isloop;
2144 continue;
2145 #endif
2146 default:
2147 continue;
2148 }
2149 isloop:
2150 getnameinfo(sa, sa->sa_len, pname, sizeof(pname), NULL, 0,
2151 NI_NUMERICHOST);
2152 syslog(LOG_WARNING, "%s/%s:%s/%s loop request REFUSED from %s",
2153 sep->se_service, sep->se_proto,
2154 se2->se_service, se2->se_proto,
2155 pname);
2156 return 1;
2157 }
2158 return 0;
2159 }
2160
2161 /*
2162 * print_service:
2163 * Dump relevant information to stderr
2164 */
2165 void
print_service(const char * action,const struct servtab * sep)2166 print_service(const char *action, const struct servtab *sep)
2167 {
2168 fprintf(stderr,
2169 "%s: %s proto=%s accept=%d max=%d user=%s group=%s"
2170 #ifdef LOGIN_CAP
2171 "class=%s"
2172 #endif
2173 " builtin=%p server=%s"
2174 #ifdef IPSEC
2175 " policy=\"%s\""
2176 #endif
2177 "\n",
2178 action, sep->se_service, sep->se_proto,
2179 sep->se_accept, sep->se_maxchild, sep->se_user, sep->se_group,
2180 #ifdef LOGIN_CAP
2181 sep->se_class,
2182 #endif
2183 (void *) sep->se_bi, sep->se_server
2184 #ifdef IPSEC
2185 , (sep->se_policy ? sep->se_policy : "")
2186 #endif
2187 );
2188 }
2189
2190 #define CPMHSIZE 256
2191 #define CPMHMASK (CPMHSIZE-1)
2192 #define CHTGRAN 10
2193 #define CHTSIZE 6
2194
2195 typedef struct CTime {
2196 unsigned long ct_Ticks;
2197 int ct_Count;
2198 } CTime;
2199
2200 typedef struct CHash {
2201 union {
2202 struct in_addr c4_Addr;
2203 struct in6_addr c6_Addr;
2204 } cu_Addr;
2205 #define ch_Addr4 cu_Addr.c4_Addr
2206 #define ch_Addr6 cu_Addr.c6_Addr
2207 int ch_Family;
2208 time_t ch_LTime;
2209 char *ch_Service;
2210 CTime ch_Times[CHTSIZE];
2211 } CHash;
2212
2213 CHash CHashAry[CPMHSIZE];
2214
2215 int
cpmip(const struct servtab * sep,int ctrl)2216 cpmip(const struct servtab *sep, int ctrl)
2217 {
2218 struct sockaddr_storage rss;
2219 socklen_t rssLen = sizeof(rss);
2220 int r = 0;
2221
2222 /*
2223 * If getpeername() fails, just let it through (if logging is
2224 * enabled the condition is caught elsewhere)
2225 */
2226
2227 if (sep->se_maxcpm > 0 &&
2228 (sep->se_family == AF_INET || sep->se_family == AF_INET6) &&
2229 getpeername(ctrl, (struct sockaddr *)&rss, &rssLen) == 0 ) {
2230 time_t t = time(NULL);
2231 int hv = 0xABC3D20F;
2232 int i;
2233 int cnt = 0;
2234 CHash *chBest = NULL;
2235 unsigned int ticks = t / CHTGRAN;
2236 struct sockaddr_in *sin4;
2237 #ifdef INET6
2238 struct sockaddr_in6 *sin6;
2239 #endif
2240
2241 sin4 = (struct sockaddr_in *)&rss;
2242 #ifdef INET6
2243 sin6 = (struct sockaddr_in6 *)&rss;
2244 #endif
2245 {
2246 char *p;
2247 int addrlen;
2248
2249 switch (rss.ss_family) {
2250 case AF_INET:
2251 p = (char *)&sin4->sin_addr;
2252 addrlen = sizeof(struct in_addr);
2253 break;
2254 #ifdef INET6
2255 case AF_INET6:
2256 p = (char *)&sin6->sin6_addr;
2257 addrlen = sizeof(struct in6_addr);
2258 break;
2259 #endif
2260 default:
2261 /* should not happen */
2262 return -1;
2263 }
2264
2265 for (i = 0; i < addrlen; ++i, ++p) {
2266 hv = (hv << 5) ^ (hv >> 23) ^ *p;
2267 }
2268 hv = (hv ^ (hv >> 16));
2269 }
2270 for (i = 0; i < 5; ++i) {
2271 CHash *ch = &CHashAry[(hv + i) & CPMHMASK];
2272
2273 if (rss.ss_family == AF_INET &&
2274 ch->ch_Family == AF_INET &&
2275 sin4->sin_addr.s_addr == ch->ch_Addr4.s_addr &&
2276 ch->ch_Service && strcmp(sep->se_service,
2277 ch->ch_Service) == 0) {
2278 chBest = ch;
2279 break;
2280 }
2281 #ifdef INET6
2282 if (rss.ss_family == AF_INET6 &&
2283 ch->ch_Family == AF_INET6 &&
2284 IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
2285 &ch->ch_Addr6) != 0 &&
2286 ch->ch_Service && strcmp(sep->se_service,
2287 ch->ch_Service) == 0) {
2288 chBest = ch;
2289 break;
2290 }
2291 #endif
2292 if (chBest == NULL || ch->ch_LTime == 0 ||
2293 ch->ch_LTime < chBest->ch_LTime) {
2294 chBest = ch;
2295 }
2296 }
2297 if ((rss.ss_family == AF_INET &&
2298 (chBest->ch_Family != AF_INET ||
2299 sin4->sin_addr.s_addr != chBest->ch_Addr4.s_addr)) ||
2300 chBest->ch_Service == NULL ||
2301 strcmp(sep->se_service, chBest->ch_Service) != 0) {
2302 chBest->ch_Family = sin4->sin_family;
2303 chBest->ch_Addr4 = sin4->sin_addr;
2304 if (chBest->ch_Service)
2305 free(chBest->ch_Service);
2306 chBest->ch_Service = strdup(sep->se_service);
2307 bzero(chBest->ch_Times, sizeof(chBest->ch_Times));
2308 }
2309 #ifdef INET6
2310 if ((rss.ss_family == AF_INET6 &&
2311 (chBest->ch_Family != AF_INET6 ||
2312 IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
2313 &chBest->ch_Addr6) == 0)) ||
2314 chBest->ch_Service == NULL ||
2315 strcmp(sep->se_service, chBest->ch_Service) != 0) {
2316 chBest->ch_Family = sin6->sin6_family;
2317 chBest->ch_Addr6 = sin6->sin6_addr;
2318 if (chBest->ch_Service)
2319 free(chBest->ch_Service);
2320 chBest->ch_Service = strdup(sep->se_service);
2321 bzero(chBest->ch_Times, sizeof(chBest->ch_Times));
2322 }
2323 #endif
2324 chBest->ch_LTime = t;
2325 {
2326 CTime *ct = &chBest->ch_Times[ticks % CHTSIZE];
2327 if (ct->ct_Ticks != ticks) {
2328 ct->ct_Ticks = ticks;
2329 ct->ct_Count = 0;
2330 }
2331 ++ct->ct_Count;
2332 }
2333 for (i = 0; i < CHTSIZE; ++i) {
2334 CTime *ct = &chBest->ch_Times[i];
2335 if (ct->ct_Ticks <= ticks &&
2336 ct->ct_Ticks >= ticks - CHTSIZE) {
2337 cnt += ct->ct_Count;
2338 }
2339 }
2340 if ((cnt * 60) / (CHTSIZE * CHTGRAN) > sep->se_maxcpm) {
2341 char pname[INET6_ADDRSTRLEN];
2342
2343 getnameinfo((struct sockaddr *)&rss,
2344 ((struct sockaddr *)&rss)->sa_len,
2345 pname, sizeof(pname), NULL, 0,
2346 NI_NUMERICHOST);
2347 r = -1;
2348 syslog(LOG_ERR,
2349 "%s from %s exceeded counts/min (limit %d/min)",
2350 sep->se_service, pname,
2351 sep->se_maxcpm);
2352 }
2353 }
2354 return(r);
2355 }
2356
2357 static struct conninfo *
search_conn(struct servtab * sep,int ctrl)2358 search_conn(struct servtab *sep, int ctrl)
2359 {
2360 struct sockaddr_storage ss;
2361 socklen_t sslen = sizeof(ss);
2362 struct conninfo *conn;
2363 int hv;
2364 char pname[NI_MAXHOST], pname2[NI_MAXHOST];
2365
2366 if (sep->se_maxperip <= 0)
2367 return NULL;
2368
2369 /*
2370 * If getpeername() fails, just let it through (if logging is
2371 * enabled the condition is caught elsewhere)
2372 */
2373 if (getpeername(ctrl, (struct sockaddr *)&ss, &sslen) != 0)
2374 return NULL;
2375
2376 switch (ss.ss_family) {
2377 case AF_INET:
2378 hv = hashval((char *)&((struct sockaddr_in *)&ss)->sin_addr,
2379 sizeof(struct in_addr));
2380 break;
2381 #ifdef INET6
2382 case AF_INET6:
2383 hv = hashval((char *)&((struct sockaddr_in6 *)&ss)->sin6_addr,
2384 sizeof(struct in6_addr));
2385 break;
2386 #endif
2387 default:
2388 /*
2389 * Since we only support AF_INET and AF_INET6, just
2390 * let other than AF_INET and AF_INET6 through.
2391 */
2392 return NULL;
2393 }
2394
2395 if (getnameinfo((struct sockaddr *)&ss, sslen, pname, sizeof(pname),
2396 NULL, 0, NI_NUMERICHOST) != 0)
2397 return NULL;
2398
2399 LIST_FOREACH(conn, &sep->se_conn[hv], co_link) {
2400 if (getnameinfo((struct sockaddr *)&conn->co_addr,
2401 conn->co_addr.ss_len, pname2, sizeof(pname2), NULL, 0,
2402 NI_NUMERICHOST) == 0 &&
2403 strcmp(pname, pname2) == 0)
2404 break;
2405 }
2406
2407 if (conn == NULL) {
2408 if ((conn = malloc(sizeof(struct conninfo))) == NULL) {
2409 syslog(LOG_ERR, "malloc: %m");
2410 exit(EX_OSERR);
2411 }
2412 conn->co_proc = malloc(sep->se_maxperip * sizeof(*conn->co_proc));
2413 if (conn->co_proc == NULL) {
2414 syslog(LOG_ERR, "malloc: %m");
2415 exit(EX_OSERR);
2416 }
2417 memcpy(&conn->co_addr, (struct sockaddr *)&ss, sslen);
2418 conn->co_numchild = 0;
2419 LIST_INSERT_HEAD(&sep->se_conn[hv], conn, co_link);
2420 }
2421
2422 /*
2423 * Since a child process is not invoked yet, we cannot
2424 * determine a pid of a child. So, co_proc and co_numchild
2425 * should be filled leter.
2426 */
2427
2428 return conn;
2429 }
2430
2431 static int
room_conn(struct servtab * sep,struct conninfo * conn)2432 room_conn(struct servtab *sep, struct conninfo *conn)
2433 {
2434 char pname[NI_MAXHOST];
2435
2436 if (conn->co_numchild >= sep->se_maxperip) {
2437 getnameinfo((struct sockaddr *)&conn->co_addr,
2438 conn->co_addr.ss_len, pname, sizeof(pname), NULL, 0,
2439 NI_NUMERICHOST);
2440 syslog(LOG_ERR, "%s from %s exceeded counts (limit %d)",
2441 sep->se_service, pname, sep->se_maxperip);
2442 return 0;
2443 }
2444 return 1;
2445 }
2446
2447 static void
addchild_conn(struct conninfo * conn,pid_t pid)2448 addchild_conn(struct conninfo *conn, pid_t pid)
2449 {
2450 struct procinfo *proc;
2451
2452 if (conn == NULL)
2453 return;
2454
2455 if ((proc = search_proc(pid, 1)) != NULL) {
2456 if (proc->pr_conn != NULL) {
2457 syslog(LOG_ERR,
2458 "addchild_conn: child already on process list");
2459 exit(EX_OSERR);
2460 }
2461 proc->pr_conn = conn;
2462 }
2463
2464 conn->co_proc[conn->co_numchild++] = proc;
2465 }
2466
2467 static void
reapchild_conn(pid_t pid)2468 reapchild_conn(pid_t pid)
2469 {
2470 struct procinfo *proc;
2471 struct conninfo *conn;
2472 int i;
2473
2474 if ((proc = search_proc(pid, 0)) == NULL)
2475 return;
2476 if ((conn = proc->pr_conn) == NULL)
2477 return;
2478 for (i = 0; i < conn->co_numchild; ++i)
2479 if (conn->co_proc[i] == proc) {
2480 conn->co_proc[i] = conn->co_proc[--conn->co_numchild];
2481 break;
2482 }
2483 free_proc(proc);
2484 free_conn(conn);
2485 }
2486
2487 static void
resize_conn(struct servtab * sep,int maxpip)2488 resize_conn(struct servtab *sep, int maxpip)
2489 {
2490 struct conninfo *conn;
2491 int i, j;
2492
2493 if (sep->se_maxperip <= 0)
2494 return;
2495 if (maxpip <= 0) {
2496 free_connlist(sep);
2497 return;
2498 }
2499 for (i = 0; i < PERIPSIZE; ++i) {
2500 LIST_FOREACH(conn, &sep->se_conn[i], co_link) {
2501 for (j = maxpip; j < conn->co_numchild; ++j)
2502 free_proc(conn->co_proc[j]);
2503 conn->co_proc = realloc(conn->co_proc,
2504 maxpip * sizeof(*conn->co_proc));
2505 if (conn->co_proc == NULL) {
2506 syslog(LOG_ERR, "realloc: %m");
2507 exit(EX_OSERR);
2508 }
2509 if (conn->co_numchild > maxpip)
2510 conn->co_numchild = maxpip;
2511 }
2512 }
2513 }
2514
2515 static void
free_connlist(struct servtab * sep)2516 free_connlist(struct servtab *sep)
2517 {
2518 struct conninfo *conn;
2519 int i, j;
2520
2521 for (i = 0; i < PERIPSIZE; ++i) {
2522 while ((conn = LIST_FIRST(&sep->se_conn[i])) != NULL) {
2523 for (j = 0; j < conn->co_numchild; ++j)
2524 free_proc(conn->co_proc[j]);
2525 conn->co_numchild = 0;
2526 free_conn(conn);
2527 }
2528 }
2529 }
2530
2531 static void
free_conn(struct conninfo * conn)2532 free_conn(struct conninfo *conn)
2533 {
2534 if (conn == NULL)
2535 return;
2536 if (conn->co_numchild <= 0) {
2537 LIST_REMOVE(conn, co_link);
2538 free(conn->co_proc);
2539 free(conn);
2540 }
2541 }
2542
2543 static struct procinfo *
search_proc(pid_t pid,int add)2544 search_proc(pid_t pid, int add)
2545 {
2546 struct procinfo *proc;
2547 int hv;
2548
2549 hv = hashval((char *)&pid, sizeof(pid));
2550 LIST_FOREACH(proc, &proctable[hv], pr_link) {
2551 if (proc->pr_pid == pid)
2552 break;
2553 }
2554 if (proc == NULL && add) {
2555 if ((proc = malloc(sizeof(struct procinfo))) == NULL) {
2556 syslog(LOG_ERR, "malloc: %m");
2557 exit(EX_OSERR);
2558 }
2559 proc->pr_pid = pid;
2560 proc->pr_conn = NULL;
2561 LIST_INSERT_HEAD(&proctable[hv], proc, pr_link);
2562 }
2563 return proc;
2564 }
2565
2566 static void
free_proc(struct procinfo * proc)2567 free_proc(struct procinfo *proc)
2568 {
2569 if (proc == NULL)
2570 return;
2571 LIST_REMOVE(proc, pr_link);
2572 free(proc);
2573 }
2574
2575 static int
hashval(char * p,int len)2576 hashval(char *p, int len)
2577 {
2578 int i, hv = 0xABC3D20F;
2579
2580 for (i = 0; i < len; ++i, ++p)
2581 hv = (hv << 5) ^ (hv >> 23) ^ *p;
2582 hv = (hv ^ (hv >> 16)) & (PERIPSIZE - 1);
2583 return hv;
2584 }
2585