1 /* $NetBSD: rlogind.c,v 1.42 2012/11/04 21:35:45 christos Exp $ */
2
3 /*
4 * Copyright (C) 1998 WIDE Project.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by WIDE Project and
18 * its contributors.
19 * 4. Neither the name of the project nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36 /*-
37 * Copyright (c) 1983, 1988, 1989, 1993
38 * The Regents of the University of California. All rights reserved.
39 *
40 * Redistribution and use in source and binary forms, with or without
41 * modification, are permitted provided that the following conditions
42 * are met:
43 * 1. Redistributions of source code must retain the above copyright
44 * notice, this list of conditions and the following disclaimer.
45 * 2. Redistributions in binary form must reproduce the above copyright
46 * notice, this list of conditions and the following disclaimer in the
47 * documentation and/or other materials provided with the distribution.
48 * 3. Neither the name of the University nor the names of its contributors
49 * may be used to endorse or promote products derived from this software
50 * without specific prior written permission.
51 *
52 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
53 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
54 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
55 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
56 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
57 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
58 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
59 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
60 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
61 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
62 * SUCH DAMAGE.
63 */
64
65 #include <sys/cdefs.h>
66 #ifndef lint
67 __COPYRIGHT("@(#) Copyright (c) 1983, 1988, 1989, 1993\
68 The Regents of the University of California. All rights reserved.");
69 #if 0
70 static char sccsid[] = "@(#)rlogind.c 8.2 (Berkeley) 4/28/95";
71 #else
72 __RCSID("$NetBSD: rlogind.c,v 1.42 2012/11/04 21:35:45 christos Exp $");
73 #endif
74 #endif /* not lint */
75
76 /*
77 * remote login server:
78 * \0
79 * remuser\0
80 * locuser\0
81 * terminal_type/speed\0
82 * data
83 */
84
85 #include <sys/param.h>
86 #include <sys/stat.h>
87 #include <sys/ioctl.h>
88 #include <signal.h>
89 #include <termios.h>
90 #include <poll.h>
91 #include <vis.h>
92
93 #include <sys/socket.h>
94 #include <netinet/in.h>
95 #include <netinet/in_systm.h>
96 #include <netinet/ip.h>
97 #include <arpa/inet.h>
98 #include <netdb.h>
99
100 #include <pwd.h>
101 #include <syslog.h>
102 #include <errno.h>
103 #include <stdio.h>
104 #include <unistd.h>
105 #include <stdlib.h>
106 #include <string.h>
107 #ifdef SUPPORT_UTMPX
108 #include <utmpx.h>
109 #endif
110 #include <util.h>
111 #include "pathnames.h"
112
113 #ifndef TIOCPKT_WINDOW
114 #define TIOCPKT_WINDOW 0x80
115 #endif
116
117 #define OPTIONS "alnL"
118
119 static char *env[2];
120 #define NMAX 30
121 static char lusername[NMAX+1], rusername[NMAX+1];
122 static char term[64] = "TERM=";
123 #define ENVSIZE (sizeof("TERM=")-1) /* skip null for concatenation */
124 static int keepalive = 1;
125 static int check_all = 0;
126 static int log_success = 0;
127
128 static struct passwd *pwd;
129
130 __dead static void doit(int, struct sockaddr_storage *);
131 static int control(int, char *, int);
132 static void protocol(int, int);
133 __dead static void cleanup(int);
134 __dead static void fatal(int, const char *, int);
135 static int do_rlogin(struct sockaddr *, char *);
136 static void getstr(char *, int, const char *);
137 static void setup_term(int);
138 #if 0
139 static int do_krb_login(union sockunion *);
140 #endif
141 __dead static void usage(void);
142 static int local_domain(char *);
143 static char *topdomain(char *);
144
145 extern int __check_rhosts_file;
146 extern char *__rcmd_errstr; /* syslog hook from libc/net/rcmd.c */
147 extern char **environ;
148
149 int
main(int argc,char * argv[])150 main(int argc, char *argv[])
151 {
152 struct sockaddr_storage from;
153 int ch, on;
154 socklen_t fromlen = sizeof(from);
155
156 openlog("rlogind", LOG_PID, LOG_AUTH);
157
158 opterr = 0;
159 while ((ch = getopt(argc, argv, OPTIONS)) != -1)
160 switch (ch) {
161 case 'a':
162 check_all = 1;
163 break;
164 case 'l':
165 __check_rhosts_file = 0;
166 break;
167 case 'n':
168 keepalive = 0;
169 break;
170 case 'L':
171 log_success = 1;
172 break;
173 case '?':
174 default:
175 usage();
176 break;
177 }
178 argc -= optind;
179 argv += optind;
180
181 if (getpeername(0, (struct sockaddr *)&from, &fromlen) < 0) {
182 syslog(LOG_ERR,"Can't get peer name of remote host: %m");
183 fatal(STDERR_FILENO, "Can't get peer name of remote host", 1);
184 }
185 #ifdef INET6
186 if (from.ss_family == AF_INET6 &&
187 IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)&from)->sin6_addr) &&
188 sizeof(struct sockaddr_in) <= sizeof(from)) {
189 struct sockaddr_in sin4;
190 struct sockaddr_in6 *sin6;
191 const int off = sizeof(struct sockaddr_in6) -
192 sizeof(struct sockaddr_in);
193
194 sin6 = (struct sockaddr_in6 *)&from;
195 memset(&sin4, 0, sizeof(sin4));
196 sin4.sin_family = AF_INET;
197 sin4.sin_len = sizeof(struct sockaddr_in);
198 memcpy(&sin4.sin_addr, &sin6->sin6_addr.s6_addr[off],
199 sizeof(sin4.sin_addr));
200 memcpy(&from, &sin4, sizeof(sin4));
201 }
202 #else
203 if (from.ss_family == AF_INET6 &&
204 IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)&from)->sin6_addr)) {
205 char hbuf[NI_MAXHOST];
206 if (getnameinfo((struct sockaddr *)&from, fromlen, hbuf,
207 sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) {
208 strlcpy(hbuf, "invalid", sizeof(hbuf));
209 }
210 syslog(LOG_ERR, "malformed \"from\" address (v4 mapped, %s)\n",
211 hbuf);
212 exit(1);
213 }
214 #endif
215 on = 1;
216 if (keepalive &&
217 setsockopt(0, SOL_SOCKET, SO_KEEPALIVE, &on, sizeof (on)) < 0)
218 syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m");
219 #if defined(IP_TOS)
220 if (from.ss_family == AF_INET) {
221 on = IPTOS_LOWDELAY;
222 if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&on, sizeof(int)) < 0)
223 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m");
224 }
225 #endif
226 doit(0, &from);
227 /* NOTREACHED */
228 #ifdef __GNUC__
229 exit(0);
230 #endif
231 }
232
233 static int netf;
234 static char line[MAXPATHLEN];
235 static int confirmed;
236
237 static struct winsize win = { 0, 0, 0, 0 };
238
239 static void
doit(int f,struct sockaddr_storage * fromp)240 doit(int f, struct sockaddr_storage *fromp)
241 {
242 int master, pid, on = 1;
243 int authenticated = 0;
244 char *hostname;
245 char hostnamebuf[2 * MAXHOSTNAMELEN + 1];
246 char hostaddrbuf[sizeof(*fromp) * 4 + 1];
247 char c;
248 char naddr[NI_MAXHOST];
249 char saddr[NI_MAXHOST];
250 char raddr[NI_MAXHOST];
251 int af = fromp->ss_family;
252 u_int16_t *portp;
253 struct addrinfo hints, *res, *res0;
254 int gaierror;
255 socklen_t fromlen = fromp->ss_len > sizeof(*fromp)
256 ? sizeof(*fromp) : fromp->ss_len;
257 const int niflags = NI_NUMERICHOST | NI_NUMERICSERV;
258
259 alarm(60);
260 read(f, &c, 1);
261
262 if (c != 0)
263 exit(1);
264
265 alarm(0);
266 switch (af) {
267 case AF_INET:
268 portp = &((struct sockaddr_in *)fromp)->sin_port;
269 break;
270 #ifdef INET6
271 case AF_INET6:
272 portp = &((struct sockaddr_in6 *)fromp)->sin6_port;
273 break;
274 #endif
275 default:
276 syslog(LOG_ERR, "malformed \"from\" address (af %d)\n", af);
277 exit(1);
278 }
279 if (getnameinfo((struct sockaddr *)fromp, fromlen,
280 naddr, sizeof(naddr), NULL, 0, niflags) != 0) {
281 syslog(LOG_ERR, "malformed \"from\" address (af %d)\n", af);
282 exit(1);
283 }
284
285 if (getnameinfo((struct sockaddr *)fromp, fromlen,
286 saddr, sizeof(saddr), NULL, 0, NI_NAMEREQD) == 0) {
287 /*
288 * If name returned by getnameinfo is in our domain,
289 * attempt to verify that we haven't been fooled by someone
290 * in a remote net; look up the name and check that this
291 * address corresponds to the name.
292 */
293 hostname = saddr;
294 res0 = NULL;
295 if (check_all || local_domain(saddr)) {
296 strlcpy(hostnamebuf, saddr, sizeof(hostnamebuf));
297 memset(&hints, 0, sizeof(hints));
298 hints.ai_family = fromp->ss_family;
299 hints.ai_socktype = SOCK_STREAM;
300 hints.ai_flags = AI_CANONNAME;
301 gaierror = getaddrinfo(hostnamebuf, "0", &hints, &res0);
302 if (gaierror) {
303 syslog(LOG_NOTICE,
304 "Couldn't look up address for %s: %s",
305 hostnamebuf, gai_strerror(gaierror));
306 hostname = naddr;
307 } else {
308 for (res = res0; res; res = res->ai_next) {
309 if (res->ai_family != fromp->ss_family)
310 continue;
311 if (res->ai_addrlen != fromp->ss_len)
312 continue;
313 if (getnameinfo(res->ai_addr,
314 res->ai_addrlen,
315 raddr, sizeof(raddr), NULL, 0,
316 niflags) == 0
317 && strcmp(naddr, raddr) == 0) {
318 hostname = res->ai_canonname
319 ? res->ai_canonname
320 : saddr;
321 break;
322 }
323 }
324 if (res == NULL) {
325 syslog(LOG_NOTICE,
326 "Host addr %s not listed for host %s",
327 naddr, res0->ai_canonname
328 ? res0->ai_canonname
329 : saddr);
330 hostname = naddr;
331 }
332 }
333 }
334 strlcpy(hostnamebuf, hostname, sizeof(hostnamebuf));
335 hostname = hostnamebuf;
336 if (res0)
337 freeaddrinfo(res0);
338 } else {
339 strlcpy(hostnamebuf, naddr, sizeof(hostnamebuf));
340 hostname = hostnamebuf;
341 }
342
343 if (ntohs(*portp) >= IPPORT_RESERVED ||
344 ntohs(*portp) < IPPORT_RESERVED/2) {
345 syslog(LOG_NOTICE, "Connection from %s on illegal port",
346 naddr);
347 fatal(f, "Permission denied", 0);
348 }
349 #ifdef IP_OPTIONS
350 if (fromp->ss_family == AF_INET) {
351 u_char optbuf[BUFSIZ/3], *cp;
352 char lbuf[BUFSIZ], *lp, *ep;
353 socklen_t optsize = sizeof(optbuf);
354 int ipproto;
355 struct protoent *ip;
356
357 if ((ip = getprotobyname("ip")) != NULL)
358 ipproto = ip->p_proto;
359 else
360 ipproto = IPPROTO_IP;
361 if (getsockopt(0, ipproto, IP_OPTIONS, (char *)optbuf,
362 &optsize) == 0 && optsize != 0) {
363 lp = lbuf;
364 ep = lbuf + sizeof(lbuf);
365 for (cp = optbuf; optsize > 0; cp++, optsize--, lp += 3)
366 snprintf(lp, ep - lp, " %2.2x", *cp);
367 syslog(LOG_NOTICE,
368 "Connection received using IP options (ignored):%s",
369 lbuf);
370 if (setsockopt(0, ipproto, IP_OPTIONS,
371 NULL, optsize) != 0) {
372 syslog(LOG_ERR,
373 "setsockopt IP_OPTIONS NULL: %m");
374 exit(1);
375 }
376 }
377 }
378 #endif
379 if (do_rlogin((struct sockaddr *)fromp, hostname) == 0)
380 authenticated++;
381 if (confirmed == 0) {
382 write(f, "", 1);
383 confirmed = 1; /* we sent the null! */
384 }
385 netf = f;
386
387 pid = forkpty(&master, line, NULL, &win);
388 if (pid < 0) {
389 if (errno == ENOENT)
390 fatal(f, "Out of ptys", 0);
391 else
392 fatal(f, "Forkpty", 1);
393 }
394 if (pid == 0) {
395 if (f > 2) /* f should always be 0, but... */
396 (void) close(f);
397 setup_term(0);
398 (void)strvisx(hostaddrbuf, (const char *)(const void *)fromp,
399 sizeof(*fromp), VIS_WHITE);
400 if (authenticated)
401 execl(_PATH_LOGIN, "login", "-p",
402 "-h", hostname, "-a", hostaddrbuf,
403 "-f", "--", lusername, (char *)0);
404 else
405 execl(_PATH_LOGIN, "login", "-p",
406 "-h", hostname, "-a", hostaddrbuf,
407 "--", lusername, (char *)0);
408 fatal(STDERR_FILENO, _PATH_LOGIN, 1);
409 /*NOTREACHED*/
410 }
411 ioctl(f, FIONBIO, &on);
412 ioctl(master, FIONBIO, &on);
413 ioctl(master, TIOCPKT, &on);
414 signal(SIGCHLD, cleanup);
415 protocol(f, master);
416 signal(SIGCHLD, SIG_IGN);
417 cleanup(0);
418 }
419
420 static char magic[2] = { 0377, 0377 };
421 static char oobdata[] = {TIOCPKT_WINDOW};
422
423 /*
424 * Handle a "control" request (signaled by magic being present)
425 * in the data stream. For now, we are only willing to handle
426 * window size changes.
427 */
428 static int
control(int pty,char * cp,int n)429 control(int pty, char *cp, int n)
430 {
431 struct winsize w;
432
433 if (n < (int)(4+sizeof (w)) || cp[2] != 's' || cp[3] != 's')
434 return (0);
435 oobdata[0] &= ~TIOCPKT_WINDOW; /* we know he heard */
436 memmove(&w, cp+4, sizeof(w));
437 w.ws_row = ntohs(w.ws_row);
438 w.ws_col = ntohs(w.ws_col);
439 w.ws_xpixel = ntohs(w.ws_xpixel);
440 w.ws_ypixel = ntohs(w.ws_ypixel);
441 (void)ioctl(pty, TIOCSWINSZ, &w);
442 return (4+sizeof (w));
443 }
444
445 /*
446 * rlogin "protocol" machine.
447 */
448 static void
protocol(int f,int p)449 protocol(int f, int p)
450 {
451 char pibuf[1024+1], fibuf[1024], *pbp = NULL, *fbp = NULL;
452 /* XXX gcc above */
453 int pcc = 0, fcc = 0;
454 int cc, nfd;
455 char cntl;
456 struct pollfd set[2];
457
458 /*
459 * Must ignore SIGTTOU, otherwise we'll stop
460 * when we try and set slave pty's window shape
461 * (our controlling tty is the master pty).
462 */
463 (void) signal(SIGTTOU, SIG_IGN);
464 send(f, oobdata, 1, MSG_OOB); /* indicate new rlogin */
465 set[0].fd = p;
466 set[1].fd = f;
467 for (;;) {
468 set[0].events = POLLPRI;
469 set[1].events = 0;
470 if (fcc)
471 set[0].events |= POLLOUT;
472 else
473 set[1].events |= POLLIN;
474 if (pcc >= 0) {
475 if (pcc)
476 set[1].events |= POLLOUT;
477 else
478 set[0].events |= POLLIN;
479 }
480 if ((nfd = poll(set, 2, INFTIM)) < 0) {
481 if (errno == EINTR)
482 continue;
483 fatal(f, "poll", 1);
484 }
485 if (nfd == 0) {
486 /* shouldn't happen... */
487 sleep(5);
488 continue;
489 }
490 #define pkcontrol(c) ((c)&(TIOCPKT_FLUSHWRITE|TIOCPKT_NOSTOP|TIOCPKT_DOSTOP))
491 if (set[0].revents & POLLPRI) {
492 cc = read(p, &cntl, 1);
493 if (cc == 1 && pkcontrol(cntl)) {
494 cntl |= oobdata[0];
495 send(f, &cntl, 1, MSG_OOB);
496 if (cntl & TIOCPKT_FLUSHWRITE)
497 pcc = 0;
498 }
499 }
500 if (set[1].revents & POLLIN) {
501 fcc = read(f, fibuf, sizeof(fibuf));
502 if (fcc < 0 && errno == EWOULDBLOCK)
503 fcc = 0;
504 else {
505 char *cp;
506 int left, n;
507
508 if (fcc <= 0)
509 break;
510 fbp = fibuf;
511
512 top:
513 for (cp = fibuf; cp < fibuf+fcc-1; cp++)
514 if (cp[0] == magic[0] &&
515 cp[1] == magic[1]) {
516 left = fcc - (cp-fibuf);
517 n = control(p, cp, left);
518 if (n) {
519 left -= n;
520 if (left > 0)
521 memmove(cp,
522 cp+n,
523 left);
524 fcc -= n;
525 goto top; /* n^2 */
526 }
527 }
528 }
529 }
530
531 if (set[0].revents & POLLOUT && fcc > 0) {
532 cc = write(p, fbp, fcc);
533 if (cc > 0) {
534 fcc -= cc;
535 fbp += cc;
536 }
537 }
538
539 if (set[0].revents & POLLIN) {
540 pcc = read(p, pibuf, sizeof (pibuf));
541 pbp = pibuf;
542 if (pcc < 0 && errno == EWOULDBLOCK)
543 pcc = 0;
544 else if (pcc <= 0)
545 break;
546 else if (pibuf[0] == 0) {
547 pbp++, pcc--;
548 } else {
549 if (pkcontrol(pibuf[0])) {
550 pibuf[0] |= oobdata[0];
551 send(f, &pibuf[0], 1, MSG_OOB);
552 }
553 pcc = 0;
554 }
555 }
556 if (set[1].revents & POLLOUT && pcc > 0) {
557 cc = write(f, pbp, pcc);
558 if (cc > 0) {
559 pcc -= cc;
560 pbp += cc;
561 }
562 }
563 }
564 }
565
566 static void
cleanup(int signo)567 cleanup(int signo)
568 {
569 char *p, c;
570
571 p = line + sizeof(_PATH_DEV) - 1;
572 #ifdef SUPPORT_UTMP
573 if (logout(p))
574 logwtmp(p, "", "");
575 #endif
576 #ifdef SUPPORT_UTMPX
577 if (logoutx(p, 0, DEAD_PROCESS))
578 logwtmpx(p, "", "", 0, DEAD_PROCESS);
579 #endif
580 (void)chmod(line, 0666);
581 (void)chown(line, 0, 0);
582 c = *p; *p = 'p';
583 (void)chmod(line, 0666);
584 (void)chown(line, 0, 0);
585 *p = c;
586 if (ttyaction(line, "rlogind", "root"))
587 syslog(LOG_ERR, "%s: ttyaction failed", line);
588 shutdown(netf, 2);
589 exit(1);
590 }
591
592 static void
fatal(int f,const char * msg,int syserr)593 fatal(int f, const char *msg, int syserr)
594 {
595 int len;
596 char buf[BUFSIZ], *bp, *ep;
597
598 bp = buf;
599 ep = buf + sizeof(buf);
600
601 /*
602 * Prepend binary one to message if we haven't sent
603 * the magic null as confirmation.
604 */
605 if (!confirmed)
606 *bp++ = '\001'; /* error indicator */
607 if (syserr)
608 len = snprintf(bp, ep - bp, "rlogind: %s: %s.\r\n",
609 msg, strerror(errno));
610 else
611 len = snprintf(bp, ep - bp, "rlogind: %s.\r\n", msg);
612 (void) write(f, buf, bp + len - buf);
613 exit(1);
614 }
615
616 static int
do_rlogin(struct sockaddr * dest,char * host)617 do_rlogin(struct sockaddr *dest, char *host)
618 {
619 int retval;
620
621 getstr(rusername, sizeof(rusername), "remuser too long");
622 getstr(lusername, sizeof(lusername), "locuser too long");
623 getstr(term+ENVSIZE, sizeof(term)-ENVSIZE, "Terminal type too long");
624
625 pwd = getpwnam(lusername);
626 if (pwd == NULL) {
627 syslog(LOG_INFO,
628 "%s@%s as %s: unknown login.", rusername, host, lusername);
629 return (-1);
630 }
631
632 retval = iruserok_sa(dest, dest->sa_len, pwd->pw_uid == 0, rusername,
633 lusername);
634 /* XXX put inet_ntoa(dest->sin_addr.s_addr) into all messages below */
635 if (retval == 0) {
636 if (log_success)
637 syslog(LOG_INFO, "%s@%s as %s: iruserok succeeded",
638 rusername, host, lusername);
639 } else {
640 if (__rcmd_errstr)
641 syslog(LOG_INFO, "%s@%s as %s: iruserok failed (%s)",
642 rusername, host, lusername, __rcmd_errstr);
643 else
644 syslog(LOG_INFO, "%s@%s as %s: iruserok failed",
645 rusername, host, lusername);
646 }
647 return(retval);
648 }
649
650 static void
getstr(char * buf,int cnt,const char * errmsg)651 getstr(char *buf, int cnt, const char *errmsg)
652 {
653 char c;
654
655 do {
656 if (read(0, &c, 1) != 1)
657 exit(1);
658 if (--cnt < 0)
659 fatal(STDOUT_FILENO, errmsg, 0);
660 *buf++ = c;
661 } while (c != 0);
662 }
663
664
665 static void
setup_term(int fd)666 setup_term(int fd)
667 {
668 char *cp = index(term+ENVSIZE, '/');
669 char *speed;
670 struct termios tt;
671
672 #ifndef notyet
673 tcgetattr(fd, &tt);
674 if (cp) {
675 *cp++ = '\0';
676 speed = cp;
677 cp = index(speed, '/');
678 if (cp)
679 *cp++ = '\0';
680 cfsetspeed(&tt, atoi(speed));
681 }
682
683 tt.c_iflag = TTYDEF_IFLAG;
684 tt.c_oflag = TTYDEF_OFLAG;
685 tt.c_lflag = TTYDEF_LFLAG;
686 tcsetattr(fd, TCSAFLUSH, &tt);
687 #else
688 if (cp) {
689 *cp++ = '\0';
690 speed = cp;
691 cp = index(speed, '/');
692 if (cp)
693 *cp++ = '\0';
694 tcgetattr(fd, &tt);
695 cfsetspeed(&tt, atoi(speed));
696 tcsetattr(fd, TCSAFLUSH, &tt);
697 }
698 #endif
699
700 env[0] = term;
701 env[1] = 0;
702 environ = env;
703 }
704
705
706 static void
usage(void)707 usage(void)
708 {
709 syslog(LOG_ERR, "usage: rlogind [-alnL]");
710 exit(1);
711 }
712
713 /*
714 * Check whether host h is in our local domain,
715 * defined as sharing the last two components of the domain part,
716 * or the entire domain part if the local domain has only one component.
717 * If either name is unqualified (contains no '.'),
718 * assume that the host is local, as it will be
719 * interpreted as such.
720 */
721 static int
local_domain(char * h)722 local_domain(char *h)
723 {
724 char localhost[MAXHOSTNAMELEN + 1];
725 char *p1, *p2;
726
727 localhost[0] = 0;
728 (void) gethostname(localhost, sizeof(localhost));
729 localhost[sizeof(localhost) - 1] = '\0';
730 p1 = topdomain(localhost);
731 p2 = topdomain(h);
732 if (p1 == NULL || p2 == NULL || !strcasecmp(p1, p2))
733 return (1);
734 return (0);
735 }
736
737 static char *
topdomain(char * h)738 topdomain(char *h)
739 {
740 char *p;
741 char *maybe = NULL;
742 int dots = 0;
743
744 for (p = h + strlen(h); p >= h; p--) {
745 if (*p == '.') {
746 if (++dots == 2)
747 return (p);
748 maybe = p;
749 }
750 }
751 return (maybe);
752 }
753