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