2 * Copyright (c) 1983, 1988, 1989, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * @(#) Copyright (c) 1983, 1988, 1989, 1993 The Regents of the University of California. All rights reserved.
34 * @(#)rlogind.c 8.1 (Berkeley) 6/4/93
35 * $FreeBSD: src/libexec/rlogind/rlogind.c,v 1.29.2.5 2000/12/07 15:02:31 ru Exp $
36 * $DragonFly: src/libexec/rlogind/rlogind.c,v 1.3 2003/11/14 03:54:31 dillon Exp $
40 * remote login server:
44 * terminal_type/speed\0
48 #define FD_SETSIZE 16 /* don't need many bits for select */
49 #include <sys/types.h>
50 #include <sys/param.h>
52 #include <sys/ioctl.h>
56 #include <sys/socket.h>
57 #include <netinet/in.h>
58 #include <netinet/in_systm.h>
59 #include <netinet/ip.h>
60 #include <netinet/tcp.h>
61 #include <arpa/inet.h>
72 #include "pathnames.h"
75 #ifndef TIOCPKT_WINDOW
76 #define TIOCPKT_WINDOW 0x80
79 #define ARGSTR "Dalnx"
81 /* wrapper for KAME-special getnameinfo() */
82 #ifndef NI_WITHSCOPEID
83 #define NI_WITHSCOPEID 0
88 char lusername[NMAX+1], rusername[NMAX+1];
89 static char term[64] = "TERM=";
90 #define ENVSIZE (sizeof("TERM=")-1) /* skip null for concatenation */
103 struct sockaddr_in su_sin;
104 struct sockaddr_in6 su_sin6;
106 #define su_len su_si.si_len
107 #define su_family su_si.si_family
108 #define su_port su_si.si_port
110 void doit (int, union sockunion *);
111 int control (int, char *, int);
112 void protocol (int, int);
114 void fatal (int, char *, int);
115 int do_rlogin (union sockunion *);
116 void getstr (char *, int, char *);
117 void setup_term (int);
118 int do_krb_login (struct sockaddr_in *);
127 extern int __check_rhosts_file;
128 union sockunion from;
131 openlog("rlogind", LOG_PID | LOG_CONS, LOG_AUTH);
134 while ((ch = getopt(argc, argv, ARGSTR)) != -1)
143 __check_rhosts_file = 0;
161 fromlen = sizeof (from);
162 if (getpeername(0, (struct sockaddr *)&from, &fromlen) < 0) {
163 syslog(LOG_ERR,"Can't get peer name of remote host: %m");
164 fatal(STDERR_FILENO, "Can't get peer name of remote host", 1);
168 setsockopt(0, SOL_SOCKET, SO_KEEPALIVE, &on, sizeof (on)) < 0)
169 syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m");
171 setsockopt(0, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) < 0)
172 syslog(LOG_WARNING, "setsockopt (TCP_NODELAY): %m");
173 if (from.su_family == AF_INET)
176 if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&on, sizeof(int)) < 0)
177 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m");
186 char line[MAXPATHLEN];
189 struct winsize win = { 0, 0, 0, 0 };
195 union sockunion *fromp;
197 int master, pid, on = 1;
198 int authenticated = 0;
199 char hostname[2 * MAXHOSTNAMELEN + 1];
200 char nameinfo[2 * INET6_ADDRSTRLEN + 1];
211 realhostname_sa(hostname, sizeof(hostname) - 1,
212 (struct sockaddr *)fromp, fromp->su_len);
214 fromp->su_port = ntohs((u_short)fromp->su_port);
215 hostname[sizeof(hostname) - 1] = '\0';
218 if ((fromp->su_family != AF_INET
220 && fromp->su_family != AF_INET6
223 fromp->su_port >= IPPORT_RESERVED ||
224 fromp->su_port < IPPORT_RESERVED/2) {
225 getnameinfo((struct sockaddr *)fromp,
227 nameinfo, sizeof(nameinfo), NULL, 0,
228 NI_NUMERICHOST|NI_WITHSCOPEID);
230 syslog(LOG_NOTICE, "Connection from %s on illegal port",
232 fatal(f, "Permission denied", 0);
235 if (fromp->su_family == AF_INET)
237 u_char optbuf[BUFSIZ/3];
238 int optsize = sizeof(optbuf), ipproto, i;
241 if ((ip = getprotobyname("ip")) != NULL)
242 ipproto = ip->p_proto;
244 ipproto = IPPROTO_IP;
245 if (getsockopt(0, ipproto, IP_OPTIONS, (char *)optbuf,
246 &optsize) == 0 && optsize != 0) {
247 for (i = 0; i < optsize; ) {
248 u_char c = optbuf[i];
249 if (c == IPOPT_LSRR || c == IPOPT_SSRR) {
251 "Connection refused from %s with IP option %s",
252 inet_ntoa(fromp->su_sin.sin_addr),
253 c == IPOPT_LSRR ? "LSRR" : "SSRR");
258 i += (c == IPOPT_NOP) ? 1 : optbuf[i+1];
263 if (do_rlogin(fromp) == 0)
266 if (confirmed == 0) {
268 confirmed = 1; /* we sent the null! */
272 (void) des_enc_write(f,
274 strlen(SECURE_MESSAGE),
275 schedule, &kdata->session);
279 pid = forkpty(&master, line, NULL, &win);
282 fatal(f, "Out of ptys", 0);
284 fatal(f, "Forkpty", 1);
287 if (f > 2) /* f should always be 0, but... */
290 if (*lusername=='-') {
291 syslog(LOG_ERR, "tried to pass user \"%s\" to login",
293 fatal(STDERR_FILENO, "invalid user", 0);
296 execl(_PATH_LOGIN, "login", "-p",
297 "-h", hostname, "-f", lusername, (char *)NULL);
299 execl(_PATH_LOGIN, "login", "-p",
300 "-h", hostname, lusername, (char *)NULL);
301 fatal(STDERR_FILENO, _PATH_LOGIN, 1);
306 * If encrypted, don't turn on NBIO or the des read/write
307 * routines will croak.
312 ioctl(f, FIONBIO, &on);
313 ioctl(master, FIONBIO, &on);
314 ioctl(master, TIOCPKT, &on);
315 signal(SIGCHLD, cleanup);
317 signal(SIGCHLD, SIG_IGN);
321 char magic[2] = { 0377, 0377 };
322 char oobdata[] = {TIOCPKT_WINDOW};
325 * Handle a "control" request (signaled by magic being present)
326 * in the data stream. For now, we are only willing to handle
327 * window size changes.
337 if (n < 4+sizeof (w) || cp[2] != 's' || cp[3] != 's')
339 oobdata[0] &= ~TIOCPKT_WINDOW; /* we know he heard */
340 bcopy(cp+4, (char *)&w, sizeof(w));
341 w.ws_row = ntohs(w.ws_row);
342 w.ws_col = ntohs(w.ws_col);
343 w.ws_xpixel = ntohs(w.ws_xpixel);
344 w.ws_ypixel = ntohs(w.ws_ypixel);
345 (void)ioctl(pty, TIOCSWINSZ, &w);
346 return (4+sizeof (w));
350 * rlogin "protocol" machine.
356 char pibuf[1024+1], fibuf[1024], *pbp = NULL, *fbp = NULL;
357 int pcc = 0, fcc = 0;
362 * Must ignore SIGTTOU, otherwise we'll stop
363 * when we try and set slave pty's window shape
364 * (our controlling tty is the master pty).
366 (void) signal(SIGTTOU, SIG_IGN);
367 send(f, oobdata, 1, MSG_OOB); /* indicate new rlogin */
372 if (nfd > FD_SETSIZE) {
373 syslog(LOG_ERR, "select mask too small, increase FD_SETSIZE");
374 fatal(f, "internal error (select mask too small)", 0);
377 fd_set ibits, obits, ebits, *omask;
382 omask = (fd_set *)NULL;
396 if ((n = select(nfd, &ibits, omask, &ebits, 0)) < 0) {
399 fatal(f, "select", 1);
402 /* shouldn't happen... */
406 #define pkcontrol(c) ((c)&(TIOCPKT_FLUSHWRITE|TIOCPKT_NOSTOP|TIOCPKT_DOSTOP))
407 if (FD_ISSET(p, &ebits)) {
408 cc = read(p, &cntl, 1);
409 if (cc == 1 && pkcontrol(cntl)) {
411 send(f, &cntl, 1, MSG_OOB);
412 if (cntl & TIOCPKT_FLUSHWRITE) {
418 if (FD_ISSET(f, &ibits)) {
421 fcc = des_enc_read(f, fibuf, sizeof(fibuf),
422 schedule, &kdata->session);
425 fcc = read(f, fibuf, sizeof(fibuf));
426 if (fcc < 0 && errno == EWOULDBLOCK)
437 for (cp = fibuf; cp < fibuf+fcc-1; cp++)
438 if (cp[0] == magic[0] &&
440 left = fcc - (cp-fibuf);
441 n = control(p, cp, left);
445 bcopy(cp+n, cp, left);
450 FD_SET(p, &obits); /* try write */
454 if (FD_ISSET(p, &obits) && fcc > 0) {
455 cc = write(p, fbp, fcc);
462 if (FD_ISSET(p, &ibits)) {
463 pcc = read(p, pibuf, sizeof (pibuf));
465 if (pcc < 0 && errno == EWOULDBLOCK)
469 else if (pibuf[0] == 0) {
474 FD_SET(f, &obits); /* try write */
476 if (pkcontrol(pibuf[0])) {
477 pibuf[0] |= oobdata[0];
478 send(f, &pibuf[0], 1, MSG_OOB);
483 if ((FD_ISSET(f, &obits)) && pcc > 0) {
486 cc = des_enc_write(f, pbp, pcc,
487 schedule, &kdata->session);
490 cc = write(f, pbp, pcc);
491 if (cc < 0 && errno == EWOULDBLOCK) {
493 * This happens when we try write after read
494 * from p, but some old kernels balk at large
495 * writes even when select returns true.
497 if (!FD_ISSET(p, &ibits))
515 p = line + sizeof(_PATH_DEV) - 1;
518 (void)chflags(line, 0);
519 (void)chmod(line, 0666);
520 (void)chown(line, 0, 0);
522 (void)chflags(line, 0);
523 (void)chmod(line, 0666);
524 (void)chown(line, 0, 0);
530 fatal(f, msg, syserr)
536 char buf[BUFSIZ], *bp = buf;
539 * Prepend binary one to message if we haven't sent
540 * the magic null as confirmation.
543 *bp++ = '\01'; /* error indicator */
545 len = snprintf(bp, sizeof(buf), "rlogind: %s: %s.\r\n",
546 msg, strerror(errno));
548 len = snprintf(bp, sizeof(buf), "rlogind: %s.\r\n", msg);
549 (void) write(f, buf, bp + len - buf);
555 union sockunion *dest;
558 getstr(rusername, sizeof(rusername), "remuser too long");
559 getstr(lusername, sizeof(lusername), "locuser too long");
560 getstr(term+ENVSIZE, sizeof(term)-ENVSIZE, "Terminal type too long");
562 pwd = getpwnam(lusername);
565 /* XXX why don't we syslog() failure? */
567 return (iruserok_sa(dest, dest->su_len, pwd->pw_uid == 0, rusername,
572 getstr(buf, cnt, errmsg)
580 if (read(0, &c, 1) != 1)
583 fatal(STDOUT_FILENO, errmsg, 0);
588 extern char **environ;
594 register char *cp = index(term+ENVSIZE, '/');
603 cp = index(speed, '/');
606 cfsetspeed(&tt, atoi(speed));
609 tt.c_iflag = TTYDEF_IFLAG;
610 tt.c_oflag = TTYDEF_OFLAG;
611 tt.c_lflag = TTYDEF_LFLAG;
612 tcsetattr(fd, TCSAFLUSH, &tt);
617 cp = index(speed, '/');
621 cfsetspeed(&tt, atoi(speed));
622 tcsetattr(fd, TCSAFLUSH, &tt);
634 syslog(LOG_ERR, "usage: rlogind [-" ARGSTR "]");