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 1.5 2007/05/18 17:05:12 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
86 extern int __check_rhosts_file;
87 extern char **environ;
91 char lusername[NMAX+1], rusername[NMAX+1];
92 static char term[64] = "TERM=";
93 #define ENVSIZE (sizeof("TERM=")-1) /* skip null for concatenation */
106 struct sockaddr_in su_sin;
107 struct sockaddr_in6 su_sin6;
109 #define su_len su_si.si_len
110 #define su_family su_si.si_family
111 #define su_port su_si.si_port
113 void doit(int, union sockunion *);
114 int control(int, char *, int);
115 void protocol(int, int);
117 void fatal(int, const char *, int);
118 int do_rlogin(union sockunion *);
119 void getstr(char *, int, const char *);
120 void setup_term(int);
121 int do_krb_login(struct sockaddr_in *);
126 main(int argc, char *argv[])
128 union sockunion from;
132 openlog("rlogind", LOG_PID | LOG_CONS, LOG_AUTH);
135 while ((ch = getopt(argc, argv, ARGSTR)) != -1)
144 __check_rhosts_file = 0;
162 fromlen = sizeof (from);
163 if (getpeername(0, (struct sockaddr *)&from, &fromlen) < 0) {
164 syslog(LOG_ERR,"Can't get peer name of remote host: %m");
165 fatal(STDERR_FILENO, "Can't get peer name of remote host", 1);
169 setsockopt(0, SOL_SOCKET, SO_KEEPALIVE, &on, sizeof (on)) < 0)
170 syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m");
172 setsockopt(0, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) < 0)
173 syslog(LOG_WARNING, "setsockopt (TCP_NODELAY): %m");
174 if (from.su_family == AF_INET)
177 if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&on, sizeof(int)) < 0)
178 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m");
187 char line[MAXPATHLEN];
190 struct winsize win = { 0, 0, 0, 0 };
194 doit(int f, union sockunion *fromp)
196 int master, pid, on = 1;
197 int authenticated = 0;
198 char hostname[2 * MAXHOSTNAMELEN + 1];
199 char nameinfo[2 * INET6_ADDRSTRLEN + 1];
210 realhostname_sa(hostname, sizeof(hostname) - 1,
211 (struct sockaddr *)fromp, fromp->su_len);
213 fromp->su_port = ntohs((u_short)fromp->su_port);
214 hostname[sizeof(hostname) - 1] = '\0';
217 if ((fromp->su_family != AF_INET
219 && fromp->su_family != AF_INET6
222 fromp->su_port >= IPPORT_RESERVED ||
223 fromp->su_port < IPPORT_RESERVED/2) {
224 getnameinfo((struct sockaddr *)fromp,
226 nameinfo, sizeof(nameinfo), NULL, 0,
227 NI_NUMERICHOST|NI_WITHSCOPEID);
229 syslog(LOG_NOTICE, "Connection from %s on illegal port",
231 fatal(f, "Permission denied", 0);
234 if (fromp->su_family == AF_INET)
236 u_char optbuf[BUFSIZ/3];
237 socklen_t optsize = sizeof(optbuf), 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; ) {
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 des_enc_write(f, SECURE_MESSAGE, strlen(SECURE_MESSAGE),
273 schedule, &kdata->session);
278 pid = forkpty(&master, line, NULL, &win);
281 fatal(f, "Out of ptys", 0);
283 fatal(f, "Forkpty", 1);
286 if (f > 2) /* f should always be 0, but... */
289 if (*lusername=='-') {
290 syslog(LOG_ERR, "tried to pass user \"%s\" to login",
292 fatal(STDERR_FILENO, "invalid user", 0);
295 execl(_PATH_LOGIN, "login", "-p",
296 "-h", hostname, "-f", lusername, (char *)NULL);
298 execl(_PATH_LOGIN, "login", "-p",
299 "-h", hostname, lusername, (char *)NULL);
300 fatal(STDERR_FILENO, _PATH_LOGIN, 1);
305 * If encrypted, don't turn on NBIO or the des read/write
306 * routines will croak.
311 ioctl(f, FIONBIO, &on);
312 ioctl(master, FIONBIO, &on);
313 ioctl(master, TIOCPKT, &on);
314 signal(SIGCHLD, cleanup);
316 signal(SIGCHLD, SIG_IGN);
320 char magic[2] = { 0377, 0377 };
321 char oobdata[] = {TIOCPKT_WINDOW};
324 * Handle a "control" request (signaled by magic being present)
325 * in the data stream. For now, we are only willing to handle
326 * window size changes.
329 control(int pty, char *cp, int n)
333 if (n < 4 + (int)sizeof(w) || cp[2] != 's' || cp[3] != 's')
335 oobdata[0] &= ~TIOCPKT_WINDOW; /* we know he heard */
336 bcopy(cp+4, (char *)&w, sizeof(w));
337 w.ws_row = ntohs(w.ws_row);
338 w.ws_col = ntohs(w.ws_col);
339 w.ws_xpixel = ntohs(w.ws_xpixel);
340 w.ws_ypixel = ntohs(w.ws_ypixel);
341 ioctl(pty, TIOCSWINSZ, &w);
342 return (4+sizeof (w));
346 * rlogin "protocol" machine.
349 protocol(int f, int p)
351 char pibuf[1024+1], fibuf[1024], *pbp = NULL, *fbp = NULL;
352 int pcc = 0, fcc = 0;
357 * Must ignore SIGTTOU, otherwise we'll stop
358 * when we try and set slave pty's window shape
359 * (our controlling tty is the master pty).
361 signal(SIGTTOU, SIG_IGN);
362 send(f, oobdata, 1, MSG_OOB); /* indicate new rlogin */
367 if (nfd > FD_SETSIZE) {
368 syslog(LOG_ERR, "select mask too small, increase FD_SETSIZE");
369 fatal(f, "internal error (select mask too small)", 0);
372 fd_set ibits, obits, ebits, *omask;
377 omask = (fd_set *)NULL;
391 if ((n = select(nfd, &ibits, omask, &ebits, 0)) < 0) {
394 fatal(f, "select", 1);
397 /* shouldn't happen... */
401 #define pkcontrol(c) ((c)&(TIOCPKT_FLUSHWRITE|TIOCPKT_NOSTOP|TIOCPKT_DOSTOP))
402 if (FD_ISSET(p, &ebits)) {
403 cc = read(p, &cntl, 1);
404 if (cc == 1 && pkcontrol(cntl)) {
406 send(f, &cntl, 1, MSG_OOB);
407 if (cntl & TIOCPKT_FLUSHWRITE) {
413 if (FD_ISSET(f, &ibits)) {
416 fcc = des_enc_read(f, fibuf, sizeof(fibuf),
417 schedule, &kdata->session);
420 fcc = read(f, fibuf, sizeof(fibuf));
421 if (fcc < 0 && errno == EWOULDBLOCK)
432 for (cp = fibuf; cp < fibuf+fcc-1; cp++)
433 if (cp[0] == magic[0] &&
435 left = fcc - (cp-fibuf);
436 n = control(p, cp, left);
440 bcopy(cp+n, cp, left);
445 FD_SET(p, &obits); /* try write */
449 if (FD_ISSET(p, &obits) && fcc > 0) {
450 cc = write(p, fbp, fcc);
457 if (FD_ISSET(p, &ibits)) {
458 pcc = read(p, pibuf, sizeof (pibuf));
460 if (pcc < 0 && errno == EWOULDBLOCK)
464 else if (pibuf[0] == 0) {
469 FD_SET(f, &obits); /* try write */
471 if (pkcontrol(pibuf[0])) {
472 pibuf[0] |= oobdata[0];
473 send(f, &pibuf[0], 1, MSG_OOB);
478 if ((FD_ISSET(f, &obits)) && pcc > 0) {
481 cc = des_enc_write(f, pbp, pcc,
482 schedule, &kdata->session);
485 cc = write(f, pbp, pcc);
486 if (cc < 0 && errno == EWOULDBLOCK) {
488 * This happens when we try write after read
489 * from p, but some old kernels balk at large
490 * writes even when select returns true.
492 if (!FD_ISSET(p, &ibits))
505 cleanup(int signo __unused)
509 p = line + sizeof(_PATH_DEV) - 1;
519 shutdown(netf, SHUT_RDWR);
524 fatal(int f, const char *msg, int syserr)
527 char buf[BUFSIZ], *bp = buf;
530 * Prepend binary one to message if we haven't sent
531 * the magic null as confirmation.
534 *bp++ = '\01'; /* error indicator */
536 len = snprintf(bp, sizeof(buf), "rlogind: %s: %s.\r\n",
537 msg, strerror(errno));
539 len = snprintf(bp, sizeof(buf), "rlogind: %s.\r\n", msg);
540 write(f, buf, bp + len - buf);
545 do_rlogin(union sockunion *dest)
548 getstr(rusername, sizeof(rusername), "remuser too long");
549 getstr(lusername, sizeof(lusername), "locuser too long");
550 getstr(term+ENVSIZE, sizeof(term)-ENVSIZE, "Terminal type too long");
552 pwd = getpwnam(lusername);
555 /* XXX why don't we syslog() failure? */
557 return (iruserok_sa(dest, dest->su_len, pwd->pw_uid == 0, rusername,
562 getstr(char *buf, int cnt, const char *errmsg)
567 if (read(0, &c, 1) != 1)
570 fatal(STDOUT_FILENO, errmsg, 0);
578 register char *cp = index(term+ENVSIZE, '/');
587 cp = index(speed, '/');
590 cfsetspeed(&tt, atoi(speed));
593 tt.c_iflag = TTYDEF_IFLAG;
594 tt.c_oflag = TTYDEF_OFLAG;
595 tt.c_lflag = TTYDEF_LFLAG;
596 tcsetattr(fd, TCSAFLUSH, &tt);
601 cp = index(speed, '/');
605 cfsetspeed(&tt, atoi(speed));
606 tcsetattr(fd, TCSAFLUSH, &tt);
618 syslog(LOG_ERR, "usage: rlogind [-" ARGSTR "]");