2 * Copyright (c) 1983, 1990, 1993
3 * The Regents of the University of California. All rights reserved.
4 * Copyright (c) 2002 Networks Associates Technology, Inc.
7 * Portions of this software were developed for the FreeBSD Project by
8 * ThinkSec AS and NAI Labs, the Security Research Division of Network
9 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035
10 * ("CBOSS"), as part of the DARPA CHATS research program.
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * @(#) Copyright (c) 1983, 1990, 1993 The Regents of the University of California. All rights reserved.
37 * @(#)rlogin.c 8.1 (Berkeley) 6/6/93
38 * $FreeBSD: src/usr.bin/rlogin/rlogin.c,v 1.30 2002/04/28 11:16:43 markm Exp $
42 * rlogin - remote login
44 #include <sys/param.h>
45 #include <sys/socket.h>
47 #include <sys/resource.h>
50 #include <netinet/in.h>
51 #include <netinet/in_systm.h>
52 #include <netinet/ip.h>
53 #include <netinet/tcp.h>
71 #include <openssl/des.h>
77 Key_schedule schedule
;
78 int use_kerberos
= 1, doencrypt
;
79 char dst_realm_buf
[REALM_SZ
], *dest_realm
= NULL
;
82 #ifndef TIOCPKT_WINDOW
83 #define TIOCPKT_WINDOW 0x80
86 /* concession to Sun */
91 int eight
, litout
, rem
;
92 int family
= PF_UNSPEC
;
95 u_char escapechar
= '~';
97 const char *speeds
[] = {
98 "0", "50", "75", "110", "134", "150", "200", "300", "600", "1200",
99 "1800", "2400", "4800", "9600", "19200", "38400", "57600", "115200"
100 #define MAX_SPEED_LENGTH (sizeof("115200") - 1)
103 #define get_window_size(fd, wp) ioctl(fd, TIOCGWINSZ, wp)
104 struct winsize winsize
;
106 void catch_child(int);
107 void copytochild(int);
108 void doit(long) __dead2
;
109 void done(int) __dead2
;
111 u_int
getescape(char *);
114 void msg(const char *);
117 void sendwindow(void);
121 void usage(void) __dead2
;
126 main(int argc
, char *argv
[])
132 int argoff
, ch
, dflag
, Dflag
, one
, uid
;
133 char *host
, *localname
, *p
, *user
, term
[1024];
137 struct sockaddr_storage ss
;
140 argoff
= dflag
= Dflag
= 0;
142 host
= localname
= user
= NULL
;
144 if ((p
= strrchr(argv
[0], '/')))
149 if (strcmp(p
, "rlogin"))
152 /* handle "rlogin host flags" */
153 if (!host
&& argc
> 2 && argv
[1][0] != '-') {
159 #define OPTIONS "468DEKLde:i:k:l:x"
161 #define OPTIONS "468DEKLde:i:l:"
163 while ((ch
= getopt(argc
- argoff
, argv
+ argoff
, OPTIONS
)) != -1)
195 escapechar
= getescape(optarg
);
199 errx(1, "-i user: permission denied");
204 dest_realm
= dst_realm_buf
;
205 (void)strncpy(dest_realm
, optarg
, REALM_SZ
);
224 /* if haven't gotten a host yet, do so */
225 if (!host
&& !(host
= argv
[optind
++]))
231 if (!(pw
= getpwuid(uid
= getuid())))
232 errx(1, "unknown user id");
236 localname
= pw
->pw_name
;
240 k
= auth_getval("auth_list");
241 if (k
&& !strstr(k
, "kerberos"))
244 sp
= getservbyname((doencrypt
? "eklogin" : "klogin"), "tcp");
247 warn("can't get entry for %s/tcp service",
248 doencrypt
? "eklogin" : "klogin");
253 sp
= getservbyname("login", "tcp");
255 errx(1, "login/tcp: unknown service");
257 #define MAX_TERM_LENGTH (sizeof(term) - 1 - MAX_SPEED_LENGTH - 1)
259 (void)strncpy(term
, (p
= getenv("TERM")) ? p
: "network",
261 term
[MAX_TERM_LENGTH
] = '\0';
262 if (ioctl(0, TIOCGETP
, &ttyb
) == 0) {
263 (void)strcat(term
, "/");
264 (void)strcat(term
, speeds
[(int)ttyb
.sg_ospeed
]);
267 (void)get_window_size(0, &winsize
);
269 (void)signal(SIGPIPE
, lostpeer
);
270 /* will use SIGUSR1 for window size hack, so hold it off */
271 omask
= sigblock(sigmask(SIGURG
) | sigmask(SIGUSR1
));
273 * We set SIGURG and SIGUSR1 below so that an
274 * incoming signal will be held pending rather than being
275 * discarded. Note that these routines will be ready to get
276 * a signal by the time that they are unblocked below.
278 (void)signal(SIGURG
, copytochild
);
279 (void)signal(SIGUSR1
, writeroob
);
286 if (dest_realm
== NULL
)
287 dest_realm
= krb_realmofhost(host
);
291 rem
= krcmd_mutual(&host
, sp
->s_port
, user
, term
, 0,
292 dest_realm
, &cred
, schedule
);
293 des_set_key(&cred
.session
, schedule
);
296 rem
= krcmd(&host
, sp
->s_port
, user
, term
, 0,
302 sp
= getservbyname("login", "tcp");
304 errx(1, "unknown service login/tcp");
305 if (errno
== ECONNREFUSED
)
306 warn("remote host doesn't support Kerberos");
308 warn("can't provide Kerberos auth data");
309 newargv
= malloc((argc
+ 2) * sizeof(*newargv
));
312 newargv
[0] = argv
[0];
314 for(i
= 1; i
< argc
; ++i
)
315 newargv
[i
+ 1] = argv
[i
];
316 newargv
[argc
+ 1] = NULL
;
317 execv(_PATH_RLOGIN
, newargv
);
322 errx(1, "the -x flag requires Kerberos authentication");
324 rem
= rcmd_af(&host
, sp
->s_port
, localname
, user
, term
, 0,
328 rem
= rcmd_af(&host
, sp
->s_port
, localname
, user
, term
, 0, family
);
329 #endif /* KERBEROS */
335 setsockopt(rem
, SOL_SOCKET
, SO_DEBUG
, &one
, sizeof(one
)) < 0)
338 setsockopt(rem
, IPPROTO_TCP
, TCP_NODELAY
, &one
, sizeof(one
)) < 0)
339 warn("setsockopt NODELAY (ignored)");
342 one
= IPTOS_LOWDELAY
;
343 if (getsockname(rem
, (struct sockaddr
*)&ss
, &sslen
) == 0 &&
344 ss
.ss_family
== AF_INET
) {
345 if (setsockopt(rem
, IPPROTO_IP
, IP_TOS
, (char *)&one
,
347 warn("setsockopt TOS (ignored)");
349 if (ss
.ss_family
== AF_INET
)
350 warn("setsockopt getsockname failed");
357 int child
, defflags
, deflflags
, tabflag
;
358 char deferase
, defkill
;
360 struct ltchars defltc
;
361 struct tchars notc
= { -1, -1, -1, -1, -1, -1 };
362 struct ltchars noltc
= { -1, -1, -1, -1, -1, -1 };
369 (void)ioctl(0, TIOCGETP
, (char *)&sb
);
370 defflags
= sb
.sg_flags
;
371 tabflag
= defflags
& TBDELAY
;
372 defflags
&= ECHO
| CRMOD
;
373 deferase
= sb
.sg_erase
;
374 defkill
= sb
.sg_kill
;
375 (void)ioctl(0, TIOCLGET
, &deflflags
);
376 (void)ioctl(0, TIOCGETC
, &deftc
);
377 notc
.t_startc
= deftc
.t_startc
;
378 notc
.t_stopc
= deftc
.t_stopc
;
379 (void)ioctl(0, TIOCGLTC
, &defltc
);
380 (void)signal(SIGINT
, SIG_IGN
);
390 if (reader(omask
) == 0) {
391 msg("connection closed.");
395 msg("\007connection closed.");
400 * We may still own the socket, and may have a pending SIGURG (or might
401 * receive one soon) that we really want to send to the reader. When
402 * one of these comes in, the trap copytochild simply copies such
403 * signals to the child. We can now unblock SIGURG and SIGUSR1
404 * that were set above.
406 (void)sigsetmask(omask
);
407 (void)signal(SIGCHLD
, catch_child
);
409 msg("closed connection.");
413 /* trap a signal, unless it is being ignored. */
417 int omask
= sigblock(sigmask(sig
));
419 if (signal(sig
, exit
) == SIG_IGN
)
420 (void)signal(sig
, SIG_IGN
);
421 (void)sigsetmask(omask
);
431 /* make sure catch_child does not snap it up */
432 (void)signal(SIGCHLD
, SIG_DFL
);
433 if (kill(child
, SIGKILL
) >= 0)
434 while ((w
= wait(&wstatus
)) > 0 && w
!= child
);
442 * This is called when the reader process gets the out-of-band (urgent)
443 * request to turn on the window-changing protocol.
446 writeroob(int signo __unused
)
448 if (dosigwinch
== 0) {
450 (void)signal(SIGWINCH
, sigwinch
);
456 catch_child(int signo __unused
)
462 pid
= wait3(&status
, WNOHANG
|WUNTRACED
, NULL
);
465 /* if the child (reader) dies, just quit */
466 if (pid
< 0 || (pid
== child
&& !WIFSTOPPED(status
)))
467 done(WTERMSIG(status
) | WEXITSTATUS(status
));
473 * writer: write to remote: 0 -> line.
475 * ~^Z suspend rlogin process.
476 * ~<delayed-suspend char> suspend rlogin process, but leave reader alone.
484 bol
= 1; /* beginning of line */
487 n
= read(STDIN_FILENO
, &c
, 1);
489 if (n
< 0 && errno
== EINTR
)
494 * If we're at the beginning of the line and recognize a
495 * command character, then we echo locally. Otherwise,
496 * characters are echo'd remotely. If the command character
497 * is doubled, this acts as a force and local echo is
502 if (!noescape
&& c
== escapechar
) {
508 if (c
== '.' || c
== deftc
.t_eofc
) {
512 if (c
== defltc
.t_suspc
|| c
== defltc
.t_dsuspc
) {
522 (void)des_enc_write(rem
,
523 (char *)&escapechar
, 1,
524 schedule
, &cred
.session
);
528 (void)write(rem
, &escapechar
, 1);
534 if (des_enc_write(rem
, &c
, 1, schedule
, &cred
.session
) == 0) {
541 if (write(rem
, &c
, 1) == 0) {
545 bol
= c
== defkill
|| c
== deftc
.t_eofc
||
546 c
== deftc
.t_intrc
|| c
== defltc
.t_suspc
||
547 c
== '\r' || c
== '\n';
563 } else if (c
== 0177) {
570 (void)write(STDOUT_FILENO
, buf
, p
- buf
);
577 (void)signal(SIGCHLD
, SIG_IGN
);
578 (void)kill(cmdc
== defltc
.t_suspc
? 0 : getpid(), SIGTSTP
);
579 (void)signal(SIGCHLD
, catch_child
);
581 sigwinch(0); /* check for size changes */
585 sigwinch(int signo __unused
)
589 if (dosigwinch
&& get_window_size(0, &ws
) == 0 &&
590 bcmp(&ws
, &winsize
, sizeof(ws
))) {
597 * Send the window size to the server via the magic escape
603 char obuf
[4 + sizeof (struct winsize
)];
605 wp
= (struct winsize
*)(obuf
+4);
610 wp
->ws_row
= htons(winsize
.ws_row
);
611 wp
->ws_col
= htons(winsize
.ws_col
);
612 wp
->ws_xpixel
= htons(winsize
.ws_xpixel
);
613 wp
->ws_ypixel
= htons(winsize
.ws_ypixel
);
618 (void)des_enc_write(rem
, obuf
, sizeof(obuf
),
619 schedule
, &cred
.session
);
623 (void)write(rem
, obuf
, sizeof(obuf
));
627 * reader: read from remote: line -> 1
633 int ppid
, rcvcnt
, rcvstate
;
634 char rcvbuf
[8 * 1024];
637 oob(int signo __unused
)
640 int atmark
, n
, out
, rcvd
;
641 char waste
[BUFSIZ
], mark
;
645 while (recv(rem
, &mark
, 1, MSG_OOB
) < 0) {
649 * Urgent data not here yet. It may not be possible
650 * to send it yet if we are blocked for output and
651 * our input buffer is full.
653 if (rcvcnt
< (int)sizeof(rcvbuf
)) {
654 n
= read(rem
, rcvbuf
+ rcvcnt
,
655 sizeof(rcvbuf
) - rcvcnt
);
660 n
= read(rem
, waste
, sizeof(waste
));
669 if (mark
& TIOCPKT_WINDOW
) {
670 /* Let server know about window size changes */
671 (void)kill(ppid
, SIGUSR1
);
673 if (!eight
&& (mark
& TIOCPKT_NOSTOP
)) {
674 (void)ioctl(0, TIOCGETP
, (char *)&sb
);
675 sb
.sg_flags
&= ~CBREAK
;
677 (void)ioctl(0, TIOCSETN
, (char *)&sb
);
680 (void)ioctl(0, TIOCSETC
, (char *)¬c
);
682 if (!eight
&& (mark
& TIOCPKT_DOSTOP
)) {
683 (void)ioctl(0, TIOCGETP
, (char *)&sb
);
685 sb
.sg_flags
|= CBREAK
;
686 (void)ioctl(0, TIOCSETN
, (char *)&sb
);
687 notc
.t_stopc
= deftc
.t_stopc
;
688 notc
.t_startc
= deftc
.t_startc
;
689 (void)ioctl(0, TIOCSETC
, (char *)¬c
);
691 if (mark
& TIOCPKT_FLUSHWRITE
) {
692 (void)ioctl(1, TIOCFLUSH
, (char *)&out
);
694 if (ioctl(rem
, SIOCATMARK
, &atmark
) < 0) {
700 n
= read(rem
, waste
, sizeof (waste
));
705 * Don't want any pending data to be output, so clear the recv
706 * buffer. If we were hanging on a write when interrupted,
707 * don't want it to restart. If we were reading, restart
714 /* oob does not do FLUSHREAD (alas!) */
717 * If we filled the receive buffer while a read was pending, longjmp
718 * to the top to restart appropriately. Don't abort a pending write,
719 * however, or we won't know how much was written.
721 if (rcvd
&& rcvstate
== READING
)
725 /* reader: read from remote: line -> 1 */
729 int pid
, n
, remaining
;
732 #if BSD >= 43 || defined(SUNOS4)
733 pid
= getpid(); /* modern systems use positives for pid */
735 pid
= -getpid(); /* old broken systems use negatives */
737 (void)signal(SIGTTOU
, SIG_IGN
);
738 (void)signal(SIGURG
, oob
);
739 (void)signal(SIGUSR1
, oob
); /* When propogating SIGURG from parent */
741 (void)fcntl(rem
, F_SETOWN
, pid
);
742 (void)setjmp(rcvtop
);
743 (void)sigsetmask(omask
);
746 while ((remaining
= rcvcnt
- (bufp
- rcvbuf
)) > 0) {
748 n
= write(STDOUT_FILENO
, bufp
, remaining
);
763 rcvcnt
= des_enc_read(rem
, rcvbuf
, sizeof(rcvbuf
),
764 schedule
, &cred
.session
);
768 rcvcnt
= read(rem
, rcvbuf
, sizeof (rcvbuf
));
788 (void)ioctl(0, TIOCGETP
, (char *)&sb
);
789 (void)ioctl(0, TIOCLGET
, (char *)&lflags
);
792 sb
.sg_flags
&= ~(CBREAK
|RAW
|TBDELAY
);
793 sb
.sg_flags
|= defflags
|tabflag
;
796 sb
.sg_kill
= defkill
;
797 sb
.sg_erase
= deferase
;
801 sb
.sg_flags
|= (eight
? RAW
: CBREAK
);
802 sb
.sg_flags
&= ~defflags
;
803 /* preserve tab delays, but turn off XTABS */
804 if ((sb
.sg_flags
& TBDELAY
) == XTABS
)
805 sb
.sg_flags
&= ~TBDELAY
;
808 sb
.sg_kill
= sb
.sg_erase
= -1;
815 (void)ioctl(0, TIOCSLTC
, (char *)ltc
);
816 (void)ioctl(0, TIOCSETC
, (char *)tc
);
817 (void)ioctl(0, TIOCSETN
, (char *)&sb
);
818 (void)ioctl(0, TIOCLSET
, (char *)&lflags
);
822 lostpeer(int signo __unused
)
824 (void)signal(SIGPIPE
, SIG_IGN
);
825 msg("\007connection closed.");
829 /* copy SIGURGs to the child process via SIGUSR1. */
831 copytochild(int signo __unused
)
833 (void)kill(child
, SIGUSR1
);
839 (void)fprintf(stderr
, "rlogin: %s\r\n", str
);
845 (void)fprintf(stderr
,
846 "usage: rlogin [-46%s]%s[-e char] [-i localname] [-l username] host\n",
849 "8DEKLdx", " [-k realm] ");
851 "8DEKLd", " [-k realm] ");
865 if ((len
= strlen(p
)) == 1) /* use any single char, including '\' */
867 /* otherwise, \nnn */
868 if (*p
== '\\' && len
>= 2 && len
<= 4) {
869 val
= strtol(++p
, NULL
, 8);
873 if (*p
< '0' || *p
> '8')
877 msg("illegal option value -- e");