blob: 9a7dc0ab0b01ba9b58848bb6dce0cbbbfcfb085e [file] [log] [blame]
Darren Tuckerde0c0252009-07-06 07:17:35 +10001/* $OpenBSD: clientloop.c,v 1.213 2009/07/05 19:28:33 stevesk Exp $ */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002/*
Damien Miller95def091999-11-25 00:26:21 +11003 * Author: Tatu Ylonen <ylo@cs.hut.fi>
Damien Miller95def091999-11-25 00:26:21 +11004 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5 * All rights reserved
Damien Miller95def091999-11-25 00:26:21 +11006 * The main loop for the interactive session (client side).
Damien Miller4af51302000-04-16 11:18:38 +10007 *
Damien Millere4340be2000-09-16 13:29:08 +11008 * As far as I am concerned, the code I have written for this software
9 * can be used freely for any purpose. Any derived versions of this
10 * software must be clearly marked as such, and if the derived work is
11 * incompatible with the protocol description in the RFC file, it must be
12 * called by a name other than "ssh" or "Secure Shell".
13 *
14 *
15 * Copyright (c) 1999 Theo de Raadt. All rights reserved.
16 *
17 * Redistribution and use in source and binary forms, with or without
18 * modification, are permitted provided that the following conditions
19 * are met:
20 * 1. Redistributions of source code must retain the above copyright
21 * notice, this list of conditions and the following disclaimer.
22 * 2. Redistributions in binary form must reproduce the above copyright
23 * notice, this list of conditions and the following disclaimer in the
24 * documentation and/or other materials provided with the distribution.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
27 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
28 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
29 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
30 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
31 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
35 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 *
37 *
Damien Miller1383bd82000-04-06 12:32:37 +100038 * SSH2 support added by Markus Friedl.
Ben Lindstrom44697232001-07-04 03:32:30 +000039 * Copyright (c) 1999, 2000, 2001 Markus Friedl. All rights reserved.
Damien Millere4340be2000-09-16 13:29:08 +110040 *
41 * Redistribution and use in source and binary forms, with or without
42 * modification, are permitted provided that the following conditions
43 * are met:
44 * 1. Redistributions of source code must retain the above copyright
45 * notice, this list of conditions and the following disclaimer.
46 * 2. Redistributions in binary form must reproduce the above copyright
47 * notice, this list of conditions and the following disclaimer in the
48 * documentation and/or other materials provided with the distribution.
49 *
50 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
51 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
52 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
53 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
54 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
55 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
56 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
57 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
58 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
59 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Damien Miller95def091999-11-25 00:26:21 +110060 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100061
62#include "includes.h"
Damien Miller17e91c02006-03-15 11:28:34 +110063
Damien Millerf17883e2006-03-15 11:45:54 +110064#include <sys/types.h>
Damien Miller9aec9192006-08-05 10:57:45 +100065#include <sys/ioctl.h>
Damien Miller8dbffe72006-08-05 11:02:17 +100066#include <sys/param.h>
Damien Millerf17883e2006-03-15 11:45:54 +110067#ifdef HAVE_SYS_STAT_H
68# include <sys/stat.h>
69#endif
Damien Miller9aec9192006-08-05 10:57:45 +100070#ifdef HAVE_SYS_TIME_H
71# include <sys/time.h>
72#endif
Damien Millere3b60b52006-07-10 21:08:03 +100073#include <sys/socket.h>
Damien Miller99bd21e2006-03-15 11:11:28 +110074
Damien Millerc7b06362006-03-15 11:53:45 +110075#include <ctype.h>
Darren Tucker39972492006-07-12 22:22:46 +100076#include <errno.h>
Damien Miller6645e7a2006-03-15 14:42:54 +110077#ifdef HAVE_PATHS_H
Damien Miller03e20032006-03-15 11:16:59 +110078#include <paths.h>
Damien Miller6645e7a2006-03-15 14:42:54 +110079#endif
Damien Miller6ff3cad2006-03-15 11:52:09 +110080#include <signal.h>
Damien Millerded319c2006-09-01 15:38:36 +100081#include <stdarg.h>
Damien Millera7a73ee2006-08-05 11:37:59 +100082#include <stdio.h>
Damien Millere7a1e5c2006-08-05 11:34:19 +100083#include <stdlib.h>
Damien Millere3476ed2006-07-24 14:13:33 +100084#include <string.h>
Damien Miller99bd21e2006-03-15 11:11:28 +110085#include <termios.h>
Damien Millerd7834352006-08-05 12:39:39 +100086#include <pwd.h>
Damien Millere6b3b612006-07-24 14:01:23 +100087#include <unistd.h>
Damien Millerd4a8b7e1999-10-27 13:42:43 +100088
Damien Millerb84886b2008-05-19 15:05:07 +100089#include "openbsd-compat/sys-queue.h"
Damien Millerd7834352006-08-05 12:39:39 +100090#include "xmalloc.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100091#include "ssh.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000092#include "ssh1.h"
93#include "ssh2.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100094#include "packet.h"
95#include "buffer.h"
Damien Millerb38eff82000-04-01 11:09:21 +100096#include "compat.h"
Ben Lindstromc7637672001-06-09 00:36:26 +000097#include "channels.h"
Damien Millerb38eff82000-04-01 11:09:21 +100098#include "dispatch.h"
Damien Miller0bc1bd82000-11-13 22:57:25 +110099#include "key.h"
Damien Millerd7834352006-08-05 12:39:39 +1000100#include "cipher.h"
Ben Lindstromf28f6342001-04-04 02:03:04 +0000101#include "kex.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +0000102#include "log.h"
103#include "readconf.h"
Ben Lindstrombf555ba2001-01-18 02:04:35 +0000104#include "clientloop.h"
Damien Milleraeb31d62005-12-13 19:29:36 +1100105#include "sshconnect.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +0000106#include "authfd.h"
107#include "atomicio.h"
Darren Tucker06f2bd82004-05-13 16:06:46 +1000108#include "sshpty.h"
Ben Lindstrom302ea6f2001-04-16 02:01:25 +0000109#include "misc.h"
Damien Miller0e220db2004-06-15 10:34:08 +1000110#include "match.h"
111#include "msg.h"
Darren Tuckerc5564e12009-06-21 18:53:53 +1000112#include "roaming.h"
Damien Miller69b69aa2000-10-28 14:19:58 +1100113
114/* import options */
115extern Options options;
116
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000117/* Flag indicating that stdin should be redirected from /dev/null. */
118extern int stdin_null_flag;
119
Damien Millerd6965512003-12-17 16:31:53 +1100120/* Flag indicating that no shell has been requested */
121extern int no_shell_flag;
122
Damien Miller0e220db2004-06-15 10:34:08 +1000123/* Control socket */
Damien Millerb1cbfa22008-05-19 16:00:08 +1000124extern int muxserver_sock;
Damien Miller0e220db2004-06-15 10:34:08 +1000125
Damien Miller5428f641999-11-25 11:54:57 +1100126/*
127 * Name of the host we are connecting to. This is the name given on the
128 * command line, or the HostName specified for the user-supplied name in a
129 * configuration file.
130 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000131extern char *host;
132
Damien Miller5428f641999-11-25 11:54:57 +1100133/*
134 * Flag to indicate that we have received a window change signal which has
135 * not yet been processed. This will cause a message indicating the new
136 * window size to be sent to the server a little later. This is volatile
137 * because this is updated in a signal handler.
138 */
Ben Lindstrom5e71c542001-12-06 16:48:14 +0000139static volatile sig_atomic_t received_window_change_signal = 0;
140static volatile sig_atomic_t received_signal = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000141
Damien Miller788f2122005-11-05 15:14:59 +1100142/* Flag indicating whether the user's terminal is in non-blocking mode. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000143static int in_non_blocking_mode = 0;
144
145/* Common data for the client loop code. */
Damien Miller97c91f62006-04-23 12:08:37 +1000146static volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */
Darren Tucker2fb66ca2008-06-13 04:49:33 +1000147static int escape_char1; /* Escape character. (proto1 only) */
148static int escape_pending1; /* Last character was an escape (proto1 only) */
Damien Miller95def091999-11-25 00:26:21 +1100149static int last_was_cr; /* Last character was a newline. */
Darren Tucker4d5cd332008-06-13 04:51:14 +1000150static int exit_status; /* Used to store the command exit status. */
151static int stdin_eof; /* EOF has been encountered on stderr. */
Damien Miller95def091999-11-25 00:26:21 +1100152static Buffer stdin_buffer; /* Buffer for stdin data. */
153static Buffer stdout_buffer; /* Buffer for stdout data. */
154static Buffer stderr_buffer; /* Buffer for stderr data. */
Ben Lindstrom46c16222000-12-22 01:43:59 +0000155static u_int buffer_high;/* Soft max buffer size. */
Damien Miller95def091999-11-25 00:26:21 +1100156static int connection_in; /* Connection to server (input). */
157static int connection_out; /* Connection to server (output). */
Ben Lindstrombe2cc432001-04-04 23:46:07 +0000158static int need_rekeying; /* Set to non-zero if rekeying is requested. */
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +0000159static int session_closed = 0; /* In SSH2: login session closed. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000160
Ben Lindstrombba81212001-06-25 05:01:22 +0000161static void client_init_dispatch(void);
Damien Miller1383bd82000-04-06 12:32:37 +1000162int session_ident = -1;
163
Darren Tucker2fb66ca2008-06-13 04:49:33 +1000164/* Track escape per proto2 channel */
165struct escape_filter_ctx {
166 int escape_pending;
167 int escape_char;
168};
169
170/* Context for channel confirmation replies */
Damien Miller5771ed72008-05-19 15:35:33 +1000171struct channel_reply_ctx {
172 const char *request_type;
173 int id, do_close;
174};
175
Darren Tucker9f407c42008-06-13 04:50:27 +1000176/* Global request success/failure callbacks */
177struct global_confirm {
178 TAILQ_ENTRY(global_confirm) entry;
179 global_confirm_cb *cb;
180 void *ctx;
181 int ref_count;
182};
183TAILQ_HEAD(global_confirms, global_confirm);
184static struct global_confirms global_confirms =
185 TAILQ_HEAD_INITIALIZER(global_confirms);
186
Ben Lindstromf28f6342001-04-04 02:03:04 +0000187/*XXX*/
188extern Kex *xxx_kex;
189
Damien Miller0e220db2004-06-15 10:34:08 +1000190void ssh_process_session2_setup(int, int, int, Buffer *);
191
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000192/* Restores stdin to blocking mode. */
193
Ben Lindstrombba81212001-06-25 05:01:22 +0000194static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000195leave_non_blocking(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000196{
Damien Miller95def091999-11-25 00:26:21 +1100197 if (in_non_blocking_mode) {
Damien Miller03e66f62004-06-15 15:47:51 +1000198 unset_nonblock(fileno(stdin));
Damien Miller95def091999-11-25 00:26:21 +1100199 in_non_blocking_mode = 0;
Damien Miller95def091999-11-25 00:26:21 +1100200 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000201}
202
Damien Miller95def091999-11-25 00:26:21 +1100203/* Puts stdin terminal in non-blocking mode. */
204
Ben Lindstrombba81212001-06-25 05:01:22 +0000205static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000206enter_non_blocking(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000207{
Damien Miller95def091999-11-25 00:26:21 +1100208 in_non_blocking_mode = 1;
Damien Miller232711f2004-06-15 10:35:30 +1000209 set_nonblock(fileno(stdin));
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000210}
211
Damien Miller5428f641999-11-25 11:54:57 +1100212/*
213 * Signal handler for the window change signal (SIGWINCH). This just sets a
214 * flag indicating that the window has changed.
215 */
Damien Millerf0b15df2006-03-26 13:59:20 +1100216/*ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +0000217static void
Damien Miller95def091999-11-25 00:26:21 +1100218window_change_handler(int sig)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000219{
Damien Miller95def091999-11-25 00:26:21 +1100220 received_window_change_signal = 1;
221 signal(SIGWINCH, window_change_handler);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000222}
223
Damien Miller5428f641999-11-25 11:54:57 +1100224/*
225 * Signal handler for signals that cause the program to terminate. These
226 * signals must be trapped to restore terminal modes.
227 */
Damien Millerf0b15df2006-03-26 13:59:20 +1100228/*ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +0000229static void
Damien Miller95def091999-11-25 00:26:21 +1100230signal_handler(int sig)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000231{
Ben Lindstromec46e0b2001-06-09 01:27:31 +0000232 received_signal = sig;
233 quit_pending = 1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000234}
235
Damien Miller5428f641999-11-25 11:54:57 +1100236/*
237 * Returns current time in seconds from Jan 1, 1970 with the maximum
238 * available resolution.
239 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000240
Ben Lindstrombba81212001-06-25 05:01:22 +0000241static double
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000242get_current_time(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000243{
Damien Miller95def091999-11-25 00:26:21 +1100244 struct timeval tv;
245 gettimeofday(&tv, NULL);
246 return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000247}
248
Damien Miller17e7ed02005-06-17 12:54:33 +1000249#define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
250void
251client_x11_get_proto(const char *display, const char *xauth_path,
252 u_int trusted, char **_proto, char **_data)
253{
254 char cmd[1024];
255 char line[512];
256 char xdisplay[512];
257 static char proto[512], data[512];
258 FILE *f;
259 int got_data = 0, generated = 0, do_unlink = 0, i;
260 char *xauthdir, *xauthfile;
261 struct stat st;
262
263 xauthdir = xauthfile = NULL;
264 *_proto = proto;
265 *_data = data;
266 proto[0] = data[0] = '\0';
267
268 if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
269 debug("No xauth program.");
270 } else {
271 if (display == NULL) {
272 debug("x11_get_proto: DISPLAY not set");
273 return;
274 }
275 /*
276 * Handle FamilyLocal case where $DISPLAY does
277 * not match an authorization entry. For this we
278 * just try "xauth list unix:displaynum.screennum".
279 * XXX: "localhost" match to determine FamilyLocal
280 * is not perfect.
281 */
282 if (strncmp(display, "localhost:", 10) == 0) {
283 snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
284 display + 10);
285 display = xdisplay;
286 }
287 if (trusted == 0) {
288 xauthdir = xmalloc(MAXPATHLEN);
289 xauthfile = xmalloc(MAXPATHLEN);
290 strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
291 if (mkdtemp(xauthdir) != NULL) {
292 do_unlink = 1;
293 snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
294 xauthdir);
295 snprintf(cmd, sizeof(cmd),
296 "%s -f %s generate %s " SSH_X11_PROTO
297 " untrusted timeout 1200 2>" _PATH_DEVNULL,
298 xauth_path, xauthfile, display);
299 debug2("x11_get_proto: %s", cmd);
300 if (system(cmd) == 0)
301 generated = 1;
302 }
303 }
Darren Tucker513d13a2007-08-15 19:13:41 +1000304
305 /*
306 * When in untrusted mode, we read the cookie only if it was
307 * successfully generated as an untrusted one in the step
308 * above.
309 */
310 if (trusted || generated) {
311 snprintf(cmd, sizeof(cmd),
312 "%s %s%s list %s 2>" _PATH_DEVNULL,
313 xauth_path,
314 generated ? "-f " : "" ,
315 generated ? xauthfile : "",
316 display);
317 debug2("x11_get_proto: %s", cmd);
318 f = popen(cmd, "r");
319 if (f && fgets(line, sizeof(line), f) &&
320 sscanf(line, "%*s %511s %511s", proto, data) == 2)
321 got_data = 1;
322 if (f)
323 pclose(f);
324 } else
325 error("Warning: untrusted X11 forwarding setup failed: "
326 "xauth key data not generated");
Damien Miller17e7ed02005-06-17 12:54:33 +1000327 }
328
329 if (do_unlink) {
330 unlink(xauthfile);
331 rmdir(xauthdir);
332 }
333 if (xauthdir)
334 xfree(xauthdir);
335 if (xauthfile)
336 xfree(xauthfile);
337
338 /*
339 * If we didn't get authentication data, just make up some
340 * data. The forwarding code will check the validity of the
341 * response anyway, and substitute this data. The X11
342 * server, however, will ignore this fake data and use
343 * whatever authentication mechanisms it was using otherwise
344 * for the local connection.
345 */
346 if (!got_data) {
347 u_int32_t rnd = 0;
348
349 logit("Warning: No xauth data; "
350 "using fake authentication data for X11 forwarding.");
351 strlcpy(proto, SSH_X11_PROTO, sizeof proto);
352 for (i = 0; i < 16; i++) {
353 if (i % 4 == 0)
354 rnd = arc4random();
355 snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
356 rnd & 0xff);
357 rnd >>= 8;
358 }
359 }
360}
361
Damien Miller5428f641999-11-25 11:54:57 +1100362/*
363 * This is called when the interactive is entered. This checks if there is
364 * an EOF coming on stdin. We must check this explicitly, as select() does
365 * not appear to wake up when redirecting from /dev/null.
366 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000367
Ben Lindstrombba81212001-06-25 05:01:22 +0000368static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000369client_check_initial_eof_on_stdin(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000370{
Damien Miller95def091999-11-25 00:26:21 +1100371 int len;
372 char buf[1];
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000373
Damien Miller5428f641999-11-25 11:54:57 +1100374 /*
375 * If standard input is to be "redirected from /dev/null", we simply
376 * mark that we have seen an EOF and send an EOF message to the
377 * server. Otherwise, we try to read a single character; it appears
378 * that for some files, such /dev/null, select() never wakes up for
379 * read for this descriptor, which means that we never get EOF. This
380 * way we will get the EOF if stdin comes from /dev/null or similar.
381 */
Damien Miller95def091999-11-25 00:26:21 +1100382 if (stdin_null_flag) {
383 /* Fake EOF on stdin. */
384 debug("Sending eof.");
385 stdin_eof = 1;
386 packet_start(SSH_CMSG_EOF);
387 packet_send();
388 } else {
Damien Miller95def091999-11-25 00:26:21 +1100389 enter_non_blocking();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000390
Damien Miller95def091999-11-25 00:26:21 +1100391 /* Check for immediate EOF on stdin. */
392 len = read(fileno(stdin), buf, 1);
393 if (len == 0) {
Darren Tucker4d5cd332008-06-13 04:51:14 +1000394 /*
395 * EOF. Record that we have seen it and send
396 * EOF to server.
397 */
Damien Miller95def091999-11-25 00:26:21 +1100398 debug("Sending eof.");
399 stdin_eof = 1;
400 packet_start(SSH_CMSG_EOF);
401 packet_send();
402 } else if (len > 0) {
Damien Miller5428f641999-11-25 11:54:57 +1100403 /*
404 * Got data. We must store the data in the buffer,
405 * and also process it as an escape character if
406 * appropriate.
407 */
Darren Tucker2fb66ca2008-06-13 04:49:33 +1000408 if ((u_char) buf[0] == escape_char1)
409 escape_pending1 = 1;
Ben Lindstrome9613cf2001-03-05 06:14:02 +0000410 else
Damien Miller95def091999-11-25 00:26:21 +1100411 buffer_append(&stdin_buffer, buf, 1);
Damien Miller95def091999-11-25 00:26:21 +1100412 }
Damien Miller95def091999-11-25 00:26:21 +1100413 leave_non_blocking();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000414 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000415}
416
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000417
Damien Miller5428f641999-11-25 11:54:57 +1100418/*
419 * Make packets from buffered stdin data, and buffer them for sending to the
420 * connection.
421 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000422
Ben Lindstrombba81212001-06-25 05:01:22 +0000423static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000424client_make_packets_from_stdin_data(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000425{
Ben Lindstrom46c16222000-12-22 01:43:59 +0000426 u_int len;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000427
Damien Miller95def091999-11-25 00:26:21 +1100428 /* Send buffered stdin data to the server. */
429 while (buffer_len(&stdin_buffer) > 0 &&
Damien Miller9f0f5c62001-12-21 14:45:46 +1100430 packet_not_very_much_data_to_write()) {
Damien Miller95def091999-11-25 00:26:21 +1100431 len = buffer_len(&stdin_buffer);
432 /* Keep the packets at reasonable size. */
433 if (len > packet_get_maxsize())
434 len = packet_get_maxsize();
435 packet_start(SSH_CMSG_STDIN_DATA);
436 packet_put_string(buffer_ptr(&stdin_buffer), len);
437 packet_send();
438 buffer_consume(&stdin_buffer, len);
439 /* If we have a pending EOF, send it now. */
440 if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
441 packet_start(SSH_CMSG_EOF);
442 packet_send();
443 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000444 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000445}
446
Damien Miller5428f641999-11-25 11:54:57 +1100447/*
448 * Checks if the client window has changed, and sends a packet about it to
449 * the server if so. The actual change is detected elsewhere (by a software
450 * interrupt on Unix); this just checks the flag and sends a message if
451 * appropriate.
452 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000453
Ben Lindstrombba81212001-06-25 05:01:22 +0000454static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000455client_check_window_change(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000456{
Damien Miller1383bd82000-04-06 12:32:37 +1000457 struct winsize ws;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000458
Damien Miller1383bd82000-04-06 12:32:37 +1000459 if (! received_window_change_signal)
460 return;
461 /** XXX race */
462 received_window_change_signal = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000463
Damien Millerd3444942000-09-30 14:20:03 +1100464 debug2("client_check_window_change: changed");
Damien Miller1383bd82000-04-06 12:32:37 +1000465
466 if (compat20) {
Damien Miller0e220db2004-06-15 10:34:08 +1000467 channel_send_window_changes();
Damien Miller1383bd82000-04-06 12:32:37 +1000468 } else {
Damien Miller0e220db2004-06-15 10:34:08 +1000469 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
470 return;
Damien Miller1383bd82000-04-06 12:32:37 +1000471 packet_start(SSH_CMSG_WINDOW_SIZE);
Damien Miller71a73672006-03-26 14:04:36 +1100472 packet_put_int((u_int)ws.ws_row);
473 packet_put_int((u_int)ws.ws_col);
474 packet_put_int((u_int)ws.ws_xpixel);
475 packet_put_int((u_int)ws.ws_ypixel);
Damien Miller1383bd82000-04-06 12:32:37 +1000476 packet_send();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000477 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000478}
479
Damien Miller509b0102003-12-17 16:33:10 +1100480static void
481client_global_request_reply(int type, u_int32_t seq, void *ctxt)
482{
Darren Tucker9f407c42008-06-13 04:50:27 +1000483 struct global_confirm *gc;
484
485 if ((gc = TAILQ_FIRST(&global_confirms)) == NULL)
486 return;
487 if (gc->cb != NULL)
488 gc->cb(type, seq, gc->ctx);
489 if (--gc->ref_count <= 0) {
490 TAILQ_REMOVE(&global_confirms, gc, entry);
491 bzero(gc, sizeof(*gc));
492 xfree(gc);
493 }
494
Darren Tuckerf7288d72009-06-21 18:12:20 +1000495 packet_set_alive_timeouts(0);
Damien Miller509b0102003-12-17 16:33:10 +1100496}
497
498static void
499server_alive_check(void)
500{
Darren Tuckerf7288d72009-06-21 18:12:20 +1000501 if (packet_inc_alive_timeouts() > options.server_alive_count_max) {
Damien Miller985a4482006-10-24 03:02:41 +1000502 logit("Timeout, server not responding.");
503 cleanup_exit(255);
504 }
Damien Miller509b0102003-12-17 16:33:10 +1100505 packet_start(SSH2_MSG_GLOBAL_REQUEST);
506 packet_put_cstring("keepalive@openssh.com");
507 packet_put_char(1); /* boolean: want reply */
508 packet_send();
Darren Tucker9f407c42008-06-13 04:50:27 +1000509 /* Insert an empty placeholder to maintain ordering */
510 client_register_global_confirm(NULL, NULL);
Damien Miller509b0102003-12-17 16:33:10 +1100511}
512
Damien Miller5428f641999-11-25 11:54:57 +1100513/*
514 * Waits until the client can do something (some data becomes available on
515 * one of the file descriptors).
516 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000517static void
Damien Miller5e953212001-01-30 09:14:00 +1100518client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000519 int *maxfdp, u_int *nallocp, int rekeying)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000520{
Damien Miller509b0102003-12-17 16:33:10 +1100521 struct timeval tv, *tvp;
522 int ret;
523
Damien Miller5e953212001-01-30 09:14:00 +1100524 /* Add any selections by the channel mechanism. */
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000525 channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000526
Damien Miller1383bd82000-04-06 12:32:37 +1000527 if (!compat20) {
528 /* Read from the connection, unless our buffers are full. */
529 if (buffer_len(&stdout_buffer) < buffer_high &&
530 buffer_len(&stderr_buffer) < buffer_high &&
531 channel_not_very_much_buffered_data())
Damien Miller5e953212001-01-30 09:14:00 +1100532 FD_SET(connection_in, *readsetp);
Damien Miller1383bd82000-04-06 12:32:37 +1000533 /*
534 * Read from stdin, unless we have seen EOF or have very much
535 * buffered data to send to the server.
536 */
537 if (!stdin_eof && packet_not_very_much_data_to_write())
Damien Miller5e953212001-01-30 09:14:00 +1100538 FD_SET(fileno(stdin), *readsetp);
Damien Miller1383bd82000-04-06 12:32:37 +1000539
540 /* Select stdout/stderr if have data in buffer. */
541 if (buffer_len(&stdout_buffer) > 0)
Damien Miller5e953212001-01-30 09:14:00 +1100542 FD_SET(fileno(stdout), *writesetp);
Damien Miller1383bd82000-04-06 12:32:37 +1000543 if (buffer_len(&stderr_buffer) > 0)
Damien Miller5e953212001-01-30 09:14:00 +1100544 FD_SET(fileno(stderr), *writesetp);
Damien Miller1383bd82000-04-06 12:32:37 +1000545 } else {
Ben Lindstromc8b3f472001-05-17 03:19:40 +0000546 /* channel_prepare_select could have closed the last channel */
Damien Miller164a7f42001-10-12 11:36:09 +1000547 if (session_closed && !channel_still_open() &&
548 !packet_have_data_to_write()) {
549 /* clear mask since we did not call select() */
Damien Miller79faeff2001-11-12 11:06:32 +1100550 memset(*readsetp, 0, *nallocp);
551 memset(*writesetp, 0, *nallocp);
Damien Miller164a7f42001-10-12 11:36:09 +1000552 return;
Ben Lindstromc8b3f472001-05-17 03:19:40 +0000553 } else {
554 FD_SET(connection_in, *readsetp);
555 }
Damien Miller1383bd82000-04-06 12:32:37 +1000556 }
557
Damien Miller95def091999-11-25 00:26:21 +1100558 /* Select server connection if have data to write to the server. */
559 if (packet_have_data_to_write())
Damien Miller5e953212001-01-30 09:14:00 +1100560 FD_SET(connection_out, *writesetp);
Damien Miller95def091999-11-25 00:26:21 +1100561
Damien Millerb1cbfa22008-05-19 16:00:08 +1000562 if (muxserver_sock != -1)
563 FD_SET(muxserver_sock, *readsetp);
Damien Miller0e220db2004-06-15 10:34:08 +1000564
Damien Miller5428f641999-11-25 11:54:57 +1100565 /*
566 * Wait for something to happen. This will suspend the process until
567 * some selected descriptor can be read, written, or has some other
Damien Miller509b0102003-12-17 16:33:10 +1100568 * event pending.
Damien Miller5428f641999-11-25 11:54:57 +1100569 */
Damien Miller95def091999-11-25 00:26:21 +1100570
Damien Miller509b0102003-12-17 16:33:10 +1100571 if (options.server_alive_interval == 0 || !compat20)
572 tvp = NULL;
Darren Tuckerfc959702004-07-17 16:12:08 +1000573 else {
Damien Miller509b0102003-12-17 16:33:10 +1100574 tv.tv_sec = options.server_alive_interval;
575 tv.tv_usec = 0;
576 tvp = &tv;
577 }
578 ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
579 if (ret < 0) {
Damien Miller95def091999-11-25 00:26:21 +1100580 char buf[100];
Ben Lindstromf9452512001-02-15 03:12:08 +0000581
582 /*
583 * We have to clear the select masks, because we return.
584 * We have to return, because the mainloop checks for the flags
585 * set by the signal handlers.
586 */
Damien Miller79faeff2001-11-12 11:06:32 +1100587 memset(*readsetp, 0, *nallocp);
588 memset(*writesetp, 0, *nallocp);
Ben Lindstromf9452512001-02-15 03:12:08 +0000589
Damien Miller95def091999-11-25 00:26:21 +1100590 if (errno == EINTR)
591 return;
592 /* Note: we might still have data in the buffers. */
593 snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
594 buffer_append(&stderr_buffer, buf, strlen(buf));
Damien Miller95def091999-11-25 00:26:21 +1100595 quit_pending = 1;
Damien Miller509b0102003-12-17 16:33:10 +1100596 } else if (ret == 0)
597 server_alive_check();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000598}
599
Ben Lindstrombba81212001-06-25 05:01:22 +0000600static void
Damien Millerad833b32000-08-23 10:46:23 +1000601client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000602{
Damien Miller95def091999-11-25 00:26:21 +1100603 /* Flush stdout and stderr buffers. */
Damien Millerad833b32000-08-23 10:46:23 +1000604 if (buffer_len(bout) > 0)
Darren Tucker4d5cd332008-06-13 04:51:14 +1000605 atomicio(vwrite, fileno(stdout), buffer_ptr(bout),
606 buffer_len(bout));
Damien Millerad833b32000-08-23 10:46:23 +1000607 if (buffer_len(berr) > 0)
Darren Tucker4d5cd332008-06-13 04:51:14 +1000608 atomicio(vwrite, fileno(stderr), buffer_ptr(berr),
609 buffer_len(berr));
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000610
Damien Miller95def091999-11-25 00:26:21 +1100611 leave_raw_mode();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000612
Damien Miller5428f641999-11-25 11:54:57 +1100613 /*
614 * Free (and clear) the buffer to reduce the amount of data that gets
615 * written to swap.
616 */
Damien Millerad833b32000-08-23 10:46:23 +1000617 buffer_free(bin);
618 buffer_free(bout);
619 buffer_free(berr);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000620
Damien Miller95def091999-11-25 00:26:21 +1100621 /* Send the suspend signal to the program itself. */
622 kill(getpid(), SIGTSTP);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000623
Darren Tucker5d78de62004-11-05 20:35:44 +1100624 /* Reset window sizes in case they have changed */
625 received_window_change_signal = 1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000626
Damien Miller95def091999-11-25 00:26:21 +1100627 /* OK, we have been continued by the user. Reinitialize buffers. */
Damien Millerad833b32000-08-23 10:46:23 +1000628 buffer_init(bin);
629 buffer_init(bout);
630 buffer_init(berr);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000631
Damien Miller95def091999-11-25 00:26:21 +1100632 enter_raw_mode();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000633}
634
Ben Lindstrombba81212001-06-25 05:01:22 +0000635static void
Damien Miller90fdfaf2006-03-26 14:25:37 +1100636client_process_net_input(fd_set *readset)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000637{
Darren Tuckerc5564e12009-06-21 18:53:53 +1000638 int len, cont = 0;
Darren Tucker86e30a02009-08-28 11:21:06 +1000639 char buf[SSH_IOBUFSZ];
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000640
Damien Miller5428f641999-11-25 11:54:57 +1100641 /*
642 * Read input from the server, and add any such data to the buffer of
643 * the packet subsystem.
644 */
Damien Miller95def091999-11-25 00:26:21 +1100645 if (FD_ISSET(connection_in, readset)) {
646 /* Read as much as possible. */
Darren Tuckerc5564e12009-06-21 18:53:53 +1000647 len = roaming_read(connection_in, buf, sizeof(buf), &cont);
648 if (len == 0 && cont == 0) {
Darren Tucker4d5cd332008-06-13 04:51:14 +1000649 /*
650 * Received EOF. The remote host has closed the
651 * connection.
652 */
653 snprintf(buf, sizeof buf,
654 "Connection to %.300s closed by remote host.\r\n",
655 host);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000656 buffer_append(&stderr_buffer, buf, strlen(buf));
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000657 quit_pending = 1;
658 return;
Damien Miller95def091999-11-25 00:26:21 +1100659 }
Damien Miller5428f641999-11-25 11:54:57 +1100660 /*
661 * There is a kernel bug on Solaris that causes select to
662 * sometimes wake up even though there is no data available.
663 */
Damien Millerd8968ad2008-07-04 23:10:49 +1000664 if (len < 0 &&
665 (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK))
Damien Miller95def091999-11-25 00:26:21 +1100666 len = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000667
Damien Miller95def091999-11-25 00:26:21 +1100668 if (len < 0) {
Darren Tucker4d5cd332008-06-13 04:51:14 +1000669 /*
670 * An error has encountered. Perhaps there is a
671 * network problem.
672 */
673 snprintf(buf, sizeof buf,
674 "Read from remote host %.300s: %.100s\r\n",
675 host, strerror(errno));
Damien Miller95def091999-11-25 00:26:21 +1100676 buffer_append(&stderr_buffer, buf, strlen(buf));
Damien Miller95def091999-11-25 00:26:21 +1100677 quit_pending = 1;
678 return;
679 }
680 packet_process_incoming(buf, len);
681 }
Damien Miller1383bd82000-04-06 12:32:37 +1000682}
683
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000684static void
Damien Miller5771ed72008-05-19 15:35:33 +1000685client_status_confirm(int type, Channel *c, void *ctx)
Damien Miller0e220db2004-06-15 10:34:08 +1000686{
Damien Miller5771ed72008-05-19 15:35:33 +1000687 struct channel_reply_ctx *cr = (struct channel_reply_ctx *)ctx;
688 char errmsg[256];
689 int tochan;
Darren Tuckerfc959702004-07-17 16:12:08 +1000690
Damien Miller5771ed72008-05-19 15:35:33 +1000691 /* XXX supress on mux _client_ quietmode */
692 tochan = options.log_level >= SYSLOG_LEVEL_ERROR &&
693 c->ctl_fd != -1 && c->extended_usage == CHAN_EXTENDED_WRITE;
Damien Miller0e220db2004-06-15 10:34:08 +1000694
Damien Miller5771ed72008-05-19 15:35:33 +1000695 if (type == SSH2_MSG_CHANNEL_SUCCESS) {
696 debug2("%s request accepted on channel %d",
697 cr->request_type, c->self);
698 } else if (type == SSH2_MSG_CHANNEL_FAILURE) {
699 if (tochan) {
700 snprintf(errmsg, sizeof(errmsg),
701 "%s request failed\r\n", cr->request_type);
702 } else {
703 snprintf(errmsg, sizeof(errmsg),
704 "%s request failed on channel %d",
705 cr->request_type, c->self);
706 }
707 /* If error occurred on primary session channel, then exit */
708 if (cr->do_close && c->self == session_ident)
709 fatal("%s", errmsg);
710 /* If error occurred on mux client, append to their stderr */
711 if (tochan)
712 buffer_append(&c->extended, errmsg, strlen(errmsg));
713 else
714 error("%s", errmsg);
715 if (cr->do_close) {
716 chan_read_failed(c);
717 chan_write_failed(c);
718 }
Damien Miller0e220db2004-06-15 10:34:08 +1000719 }
Damien Miller5771ed72008-05-19 15:35:33 +1000720 xfree(cr);
721}
Damien Miller0e220db2004-06-15 10:34:08 +1000722
Damien Miller5771ed72008-05-19 15:35:33 +1000723static void
724client_abandon_status_confirm(Channel *c, void *ctx)
725{
726 xfree(ctx);
727}
728
729static void
730client_expect_confirm(int id, const char *request, int do_close)
731{
732 struct channel_reply_ctx *cr = xmalloc(sizeof(*cr));
733
734 cr->request_type = request;
735 cr->do_close = do_close;
736
737 channel_register_status_confirm(id, client_status_confirm,
738 client_abandon_status_confirm, cr);
Damien Miller0e220db2004-06-15 10:34:08 +1000739}
740
Darren Tucker9f407c42008-06-13 04:50:27 +1000741void
742client_register_global_confirm(global_confirm_cb *cb, void *ctx)
743{
Damien Millerb9d3bee2008-07-16 22:40:52 +1000744 struct global_confirm *gc, *last_gc;
Darren Tucker9f407c42008-06-13 04:50:27 +1000745
746 /* Coalesce identical callbacks */
Damien Millerb9d3bee2008-07-16 22:40:52 +1000747 last_gc = TAILQ_LAST(&global_confirms, global_confirms);
748 if (last_gc && last_gc->cb == cb && last_gc->ctx == ctx) {
749 if (++last_gc->ref_count >= INT_MAX)
750 fatal("%s: last_gc->ref_count = %d",
751 __func__, last_gc->ref_count);
Darren Tucker9f407c42008-06-13 04:50:27 +1000752 return;
753 }
754
755 gc = xmalloc(sizeof(*gc));
756 gc->cb = cb;
757 gc->ctx = ctx;
758 gc->ref_count = 1;
759 TAILQ_INSERT_TAIL(&global_confirms, gc, entry);
760}
761
Damien Miller0e220db2004-06-15 10:34:08 +1000762static void
Ben Lindstrom681d9322002-03-22 03:53:00 +0000763process_cmdline(void)
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000764{
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000765 void (*handler)(int);
Damien Millerf91ee4c2005-03-01 21:24:33 +1100766 char *s, *cmd, *cancel_host;
Darren Tuckere7066df2004-05-24 10:18:05 +1000767 int delete = 0;
Damien Miller0164cb82008-11-05 16:30:31 +1100768 int local = 0, remote = 0, dynamic = 0;
Damien Miller3dc71ad2009-01-28 16:31:22 +1100769 int cancel_port;
Damien Millerf91ee4c2005-03-01 21:24:33 +1100770 Forward fwd;
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000771
Darren Tucker23ae8ca2007-12-02 23:12:30 +1100772 bzero(&fwd, sizeof(fwd));
773 fwd.listen_host = fwd.connect_host = NULL;
774
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000775 leave_raw_mode();
Ben Lindstrom5a6abda2002-06-09 19:41:48 +0000776 handler = signal(SIGINT, SIG_IGN);
Ben Lindstrom681d9322002-03-22 03:53:00 +0000777 cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000778 if (s == NULL)
779 goto out;
Darren Tucker03b1cdb2007-03-21 20:46:03 +1100780 while (isspace(*s))
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000781 s++;
Darren Tuckere7066df2004-05-24 10:18:05 +1000782 if (*s == '-')
783 s++; /* Skip cmdline '-', if any */
Darren Tuckere1675822004-05-24 10:13:07 +1000784 if (*s == '\0')
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000785 goto out;
Darren Tuckere7066df2004-05-24 10:18:05 +1000786
Darren Tucker1973c882004-05-24 10:34:36 +1000787 if (*s == 'h' || *s == 'H' || *s == '?') {
Darren Tuckere7066df2004-05-24 10:18:05 +1000788 logit("Commands:");
Damien Miller43020952006-07-10 20:16:12 +1000789 logit(" -L[bind_address:]port:host:hostport "
790 "Request local forward");
791 logit(" -R[bind_address:]port:host:hostport "
792 "Request remote forward");
Damien Miller0164cb82008-11-05 16:30:31 +1100793 logit(" -D[bind_address:]port "
794 "Request dynamic forward");
Damien Miller57e8ad32006-07-10 20:20:52 +1000795 logit(" -KR[bind_address:]port "
Damien Miller43020952006-07-10 20:16:12 +1000796 "Cancel remote forward");
Damien Millerd27b9472005-12-13 19:29:02 +1100797 if (!options.permit_local_command)
798 goto out;
Damien Miller43020952006-07-10 20:16:12 +1000799 logit(" !args "
800 "Execute local command");
Damien Millerd27b9472005-12-13 19:29:02 +1100801 goto out;
802 }
803
804 if (*s == '!' && options.permit_local_command) {
805 s++;
806 ssh_local_cmd(s);
Darren Tuckere7066df2004-05-24 10:18:05 +1000807 goto out;
808 }
809
810 if (*s == 'K') {
811 delete = 1;
812 s++;
813 }
Damien Miller0164cb82008-11-05 16:30:31 +1100814 if (*s == 'L')
815 local = 1;
816 else if (*s == 'R')
817 remote = 1;
818 else if (*s == 'D')
819 dynamic = 1;
820 else {
Damien Miller996acd22003-04-09 20:59:48 +1000821 logit("Invalid command.");
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000822 goto out;
823 }
Damien Miller0164cb82008-11-05 16:30:31 +1100824
825 if ((local || dynamic) && delete) {
Darren Tuckere7066df2004-05-24 10:18:05 +1000826 logit("Not supported.");
827 goto out;
828 }
Damien Miller0164cb82008-11-05 16:30:31 +1100829 if (remote && delete && !compat20) {
Damien Miller996acd22003-04-09 20:59:48 +1000830 logit("Not supported for SSH protocol version 1.");
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000831 goto out;
832 }
Darren Tuckere7066df2004-05-24 10:18:05 +1000833
Darren Tucker03b1cdb2007-03-21 20:46:03 +1100834 while (isspace(*++s))
835 ;
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000836
Darren Tuckere7066df2004-05-24 10:18:05 +1000837 if (delete) {
Damien Millerf91ee4c2005-03-01 21:24:33 +1100838 cancel_port = 0;
839 cancel_host = hpdelim(&s); /* may be NULL */
840 if (s != NULL) {
841 cancel_port = a2port(s);
842 cancel_host = cleanhostname(cancel_host);
843 } else {
844 cancel_port = a2port(cancel_host);
845 cancel_host = NULL;
846 }
Damien Miller3dc71ad2009-01-28 16:31:22 +1100847 if (cancel_port <= 0) {
Damien Millerf91ee4c2005-03-01 21:24:33 +1100848 logit("Bad forwarding close port");
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000849 goto out;
850 }
Damien Millerf91ee4c2005-03-01 21:24:33 +1100851 channel_request_rforward_cancel(cancel_host, cancel_port);
Darren Tuckere7066df2004-05-24 10:18:05 +1000852 } else {
Damien Miller4bf648f2009-02-14 16:28:21 +1100853 if (!parse_forward(&fwd, s, dynamic, remote)) {
Darren Tuckere7066df2004-05-24 10:18:05 +1000854 logit("Bad forwarding specification.");
855 goto out;
856 }
Damien Miller0164cb82008-11-05 16:30:31 +1100857 if (local || dynamic) {
Damien Millerf91ee4c2005-03-01 21:24:33 +1100858 if (channel_setup_local_fwd_listener(fwd.listen_host,
859 fwd.listen_port, fwd.connect_host,
860 fwd.connect_port, options.gateway_ports) < 0) {
Darren Tuckere7066df2004-05-24 10:18:05 +1000861 logit("Port forwarding failed.");
862 goto out;
863 }
Damien Millerf91ee4c2005-03-01 21:24:33 +1100864 } else {
Darren Tuckere7d4b192006-07-12 22:17:10 +1000865 if (channel_request_remote_forwarding(fwd.listen_host,
Damien Millerf91ee4c2005-03-01 21:24:33 +1100866 fwd.listen_port, fwd.connect_host,
Darren Tuckere7d4b192006-07-12 22:17:10 +1000867 fwd.connect_port) < 0) {
868 logit("Port forwarding failed.");
869 goto out;
870 }
Damien Millerf91ee4c2005-03-01 21:24:33 +1100871 }
872
Darren Tuckere7066df2004-05-24 10:18:05 +1000873 logit("Forwarding port.");
874 }
875
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000876out:
877 signal(SIGINT, handler);
878 enter_raw_mode();
879 if (cmd)
880 xfree(cmd);
Darren Tucker23ae8ca2007-12-02 23:12:30 +1100881 if (fwd.listen_host != NULL)
882 xfree(fwd.listen_host);
883 if (fwd.connect_host != NULL)
884 xfree(fwd.connect_host);
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000885}
886
Darren Tucker2fb66ca2008-06-13 04:49:33 +1000887/*
888 * Process the characters one by one, call with c==NULL for proto1 case.
889 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000890static int
Darren Tucker2fb66ca2008-06-13 04:49:33 +1000891process_escapes(Channel *c, Buffer *bin, Buffer *bout, Buffer *berr,
892 char *buf, int len)
Damien Millerad833b32000-08-23 10:46:23 +1000893{
894 char string[1024];
895 pid_t pid;
896 int bytes = 0;
Ben Lindstrom46c16222000-12-22 01:43:59 +0000897 u_int i;
898 u_char ch;
Damien Millerad833b32000-08-23 10:46:23 +1000899 char *s;
Darren Tucker2fb66ca2008-06-13 04:49:33 +1000900 int *escape_pendingp, escape_char;
901 struct escape_filter_ctx *efc;
Damien Millerad833b32000-08-23 10:46:23 +1000902
Darren Tucker2fb66ca2008-06-13 04:49:33 +1000903 if (c == NULL) {
904 escape_pendingp = &escape_pending1;
905 escape_char = escape_char1;
906 } else {
907 if (c->filter_ctx == NULL)
908 return 0;
909 efc = (struct escape_filter_ctx *)c->filter_ctx;
910 escape_pendingp = &efc->escape_pending;
911 escape_char = efc->escape_char;
912 }
913
Damien Millereccb9de2005-06-17 12:59:34 +1000914 if (len <= 0)
915 return (0);
916
917 for (i = 0; i < (u_int)len; i++) {
Damien Millerad833b32000-08-23 10:46:23 +1000918 /* Get one character at a time. */
919 ch = buf[i];
920
Darren Tucker2fb66ca2008-06-13 04:49:33 +1000921 if (*escape_pendingp) {
Damien Millerad833b32000-08-23 10:46:23 +1000922 /* We have previously seen an escape character. */
923 /* Clear the flag now. */
Darren Tucker2fb66ca2008-06-13 04:49:33 +1000924 *escape_pendingp = 0;
Damien Millerad833b32000-08-23 10:46:23 +1000925
926 /* Process the escaped character. */
927 switch (ch) {
928 case '.':
929 /* Terminate the connection. */
Darren Tucker2fb66ca2008-06-13 04:49:33 +1000930 snprintf(string, sizeof string, "%c.\r\n",
931 escape_char);
Damien Millerad833b32000-08-23 10:46:23 +1000932 buffer_append(berr, string, strlen(string));
Damien Millerad833b32000-08-23 10:46:23 +1000933
Darren Tucker2fb66ca2008-06-13 04:49:33 +1000934 if (c && c->ctl_fd != -1) {
935 chan_read_failed(c);
936 chan_write_failed(c);
937 return 0;
938 } else
939 quit_pending = 1;
Damien Millerad833b32000-08-23 10:46:23 +1000940 return -1;
941
942 case 'Z' - 64:
Darren Tucker2fb66ca2008-06-13 04:49:33 +1000943 /* XXX support this for mux clients */
944 if (c && c->ctl_fd != -1) {
945 noescape:
946 snprintf(string, sizeof string,
947 "%c%c escape not available to "
948 "multiplexed sessions\r\n",
949 escape_char, ch);
950 buffer_append(berr, string,
951 strlen(string));
952 continue;
953 }
Darren Tucker4d5cd332008-06-13 04:51:14 +1000954 /* Suspend the program. Inform the user */
Darren Tucker2fb66ca2008-06-13 04:49:33 +1000955 snprintf(string, sizeof string,
956 "%c^Z [suspend ssh]\r\n", escape_char);
Damien Millerad833b32000-08-23 10:46:23 +1000957 buffer_append(berr, string, strlen(string));
Damien Millerad833b32000-08-23 10:46:23 +1000958
959 /* Restore terminal modes and suspend. */
960 client_suspend_self(bin, bout, berr);
961
962 /* We have been continued. */
963 continue;
964
Damien Miller54c45982003-05-15 10:20:13 +1000965 case 'B':
966 if (compat20) {
967 snprintf(string, sizeof string,
968 "%cB\r\n", escape_char);
969 buffer_append(berr, string,
970 strlen(string));
971 channel_request_start(session_ident,
972 "break", 0);
973 packet_put_int(1000);
974 packet_send();
975 }
976 continue;
977
Ben Lindstromf28f6342001-04-04 02:03:04 +0000978 case 'R':
Ben Lindstrom11bd8992001-04-05 23:34:29 +0000979 if (compat20) {
980 if (datafellows & SSH_BUG_NOREKEY)
Darren Tucker4d5cd332008-06-13 04:51:14 +1000981 logit("Server does not "
982 "support re-keying");
Ben Lindstrom11bd8992001-04-05 23:34:29 +0000983 else
984 need_rekeying = 1;
985 }
Ben Lindstromf28f6342001-04-04 02:03:04 +0000986 continue;
987
Damien Millerad833b32000-08-23 10:46:23 +1000988 case '&':
Darren Tucker2fb66ca2008-06-13 04:49:33 +1000989 if (c && c->ctl_fd != -1)
990 goto noescape;
Damien Millerad833b32000-08-23 10:46:23 +1000991 /*
Darren Tucker4d5cd332008-06-13 04:51:14 +1000992 * Detach the program (continue to serve
993 * connections, but put in background and no
994 * more new connections).
Damien Millerad833b32000-08-23 10:46:23 +1000995 */
Damien Miller96507ef2001-11-12 10:52:25 +1100996 /* Restore tty modes. */
997 leave_raw_mode();
998
999 /* Stop listening for new connections. */
1000 channel_stop_listening();
1001
1002 snprintf(string, sizeof string,
1003 "%c& [backgrounded]\n", escape_char);
1004 buffer_append(berr, string, strlen(string));
1005
1006 /* Fork into background. */
1007 pid = fork();
1008 if (pid < 0) {
1009 error("fork: %.100s", strerror(errno));
1010 continue;
1011 }
1012 if (pid != 0) { /* This is the parent. */
1013 /* The parent just exits. */
1014 exit(0);
1015 }
1016 /* The child continues serving connections. */
1017 if (compat20) {
1018 buffer_append(bin, "\004", 1);
1019 /* fake EOF on stdin */
1020 return -1;
1021 } else if (!stdin_eof) {
Damien Millerad833b32000-08-23 10:46:23 +10001022 /*
Darren Tucker4d5cd332008-06-13 04:51:14 +10001023 * Sending SSH_CMSG_EOF alone does not
1024 * always appear to be enough. So we
1025 * try to send an EOF character first.
Damien Millerad833b32000-08-23 10:46:23 +10001026 */
1027 packet_start(SSH_CMSG_STDIN_DATA);
1028 packet_put_string("\004", 1);
1029 packet_send();
1030 /* Close stdin. */
1031 stdin_eof = 1;
1032 if (buffer_len(bin) == 0) {
1033 packet_start(SSH_CMSG_EOF);
1034 packet_send();
1035 }
1036 }
Damien Miller96507ef2001-11-12 10:52:25 +11001037 continue;
Damien Millerad833b32000-08-23 10:46:23 +10001038
1039 case '?':
Darren Tucker2fb66ca2008-06-13 04:49:33 +10001040 if (c && c->ctl_fd != -1) {
1041 snprintf(string, sizeof string,
Damien Millerad833b32000-08-23 10:46:23 +10001042"%c?\r\n\
1043Supported escape sequences:\r\n\
Darren Tucker2fb66ca2008-06-13 04:49:33 +10001044 %c. - terminate session\r\n\
1045 %cB - send a BREAK to the remote system\r\n\
Darren Tucker2fb66ca2008-06-13 04:49:33 +10001046 %cR - Request rekey (SSH protocol 2 only)\r\n\
1047 %c# - list forwarded connections\r\n\
1048 %c? - this message\r\n\
1049 %c%c - send the escape character by typing it twice\r\n\
Damien Millerad833b32000-08-23 10:46:23 +10001050(Note that escapes are only recognized immediately after newline.)\r\n",
Darren Tucker2fb66ca2008-06-13 04:49:33 +10001051 escape_char, escape_char,
1052 escape_char, escape_char,
1053 escape_char, escape_char,
Damien Miller586b0052008-12-09 14:11:32 +11001054 escape_char, escape_char);
Darren Tucker2fb66ca2008-06-13 04:49:33 +10001055 } else {
1056 snprintf(string, sizeof string,
1057"%c?\r\n\
1058Supported escape sequences:\r\n\
1059 %c. - terminate connection (and any multiplexed sessions)\r\n\
1060 %cB - send a BREAK to the remote system\r\n\
1061 %cC - open a command line\r\n\
1062 %cR - Request rekey (SSH protocol 2 only)\r\n\
1063 %c^Z - suspend ssh\r\n\
1064 %c# - list forwarded connections\r\n\
1065 %c& - background ssh (when waiting for connections to terminate)\r\n\
1066 %c? - this message\r\n\
1067 %c%c - send the escape character by typing it twice\r\n\
1068(Note that escapes are only recognized immediately after newline.)\r\n",
1069 escape_char, escape_char,
1070 escape_char, escape_char,
1071 escape_char, escape_char,
1072 escape_char, escape_char,
1073 escape_char, escape_char,
1074 escape_char);
1075 }
Damien Millerad833b32000-08-23 10:46:23 +10001076 buffer_append(berr, string, strlen(string));
1077 continue;
1078
1079 case '#':
Darren Tucker2fb66ca2008-06-13 04:49:33 +10001080 snprintf(string, sizeof string, "%c#\r\n",
1081 escape_char);
Damien Millerad833b32000-08-23 10:46:23 +10001082 buffer_append(berr, string, strlen(string));
1083 s = channel_open_message();
1084 buffer_append(berr, s, strlen(s));
1085 xfree(s);
1086 continue;
1087
Ben Lindstrom5589f4b2002-03-22 03:24:32 +00001088 case 'C':
Damien Miller586b0052008-12-09 14:11:32 +11001089 if (c && c->ctl_fd != -1)
1090 goto noescape;
Ben Lindstrom681d9322002-03-22 03:53:00 +00001091 process_cmdline();
Ben Lindstrom5589f4b2002-03-22 03:24:32 +00001092 continue;
1093
Damien Millerad833b32000-08-23 10:46:23 +10001094 default:
1095 if (ch != escape_char) {
1096 buffer_put_char(bin, escape_char);
1097 bytes++;
1098 }
1099 /* Escaped characters fall through here */
1100 break;
1101 }
1102 } else {
1103 /*
Darren Tucker4d5cd332008-06-13 04:51:14 +10001104 * The previous character was not an escape char.
1105 * Check if this is an escape.
Damien Millerad833b32000-08-23 10:46:23 +10001106 */
1107 if (last_was_cr && ch == escape_char) {
Darren Tucker4d5cd332008-06-13 04:51:14 +10001108 /*
1109 * It is. Set the flag and continue to
1110 * next character.
1111 */
Darren Tucker2fb66ca2008-06-13 04:49:33 +10001112 *escape_pendingp = 1;
Damien Millerad833b32000-08-23 10:46:23 +10001113 continue;
1114 }
1115 }
1116
1117 /*
1118 * Normal character. Record whether it was a newline,
1119 * and append it to the buffer.
1120 */
1121 last_was_cr = (ch == '\r' || ch == '\n');
1122 buffer_put_char(bin, ch);
1123 bytes++;
1124 }
1125 return bytes;
1126}
1127
Ben Lindstrombba81212001-06-25 05:01:22 +00001128static void
Damien Miller90fdfaf2006-03-26 14:25:37 +11001129client_process_input(fd_set *readset)
Damien Miller1383bd82000-04-06 12:32:37 +10001130{
Damien Miller166fca82000-04-20 07:42:21 +10001131 int len;
Darren Tucker86e30a02009-08-28 11:21:06 +10001132 char buf[SSH_IOBUFSZ];
Damien Miller1383bd82000-04-06 12:32:37 +10001133
Damien Miller95def091999-11-25 00:26:21 +11001134 /* Read input from stdin. */
1135 if (FD_ISSET(fileno(stdin), readset)) {
1136 /* Read as much as possible. */
1137 len = read(fileno(stdin), buf, sizeof(buf));
Damien Millerd8968ad2008-07-04 23:10:49 +10001138 if (len < 0 &&
1139 (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK))
Ben Lindstrom4c8cff12001-04-17 18:09:42 +00001140 return; /* we'll try again later */
Damien Miller95def091999-11-25 00:26:21 +11001141 if (len <= 0) {
Damien Miller5428f641999-11-25 11:54:57 +11001142 /*
1143 * Received EOF or error. They are treated
1144 * similarly, except that an error message is printed
1145 * if it was an error condition.
1146 */
Damien Miller95def091999-11-25 00:26:21 +11001147 if (len < 0) {
Darren Tucker4d5cd332008-06-13 04:51:14 +10001148 snprintf(buf, sizeof buf, "read: %.100s\r\n",
1149 strerror(errno));
Damien Miller95def091999-11-25 00:26:21 +11001150 buffer_append(&stderr_buffer, buf, strlen(buf));
Damien Miller95def091999-11-25 00:26:21 +11001151 }
1152 /* Mark that we have seen EOF. */
1153 stdin_eof = 1;
Damien Miller5428f641999-11-25 11:54:57 +11001154 /*
1155 * Send an EOF message to the server unless there is
1156 * data in the buffer. If there is data in the
1157 * buffer, no message will be sent now. Code
1158 * elsewhere will send the EOF when the buffer
1159 * becomes empty if stdin_eof is set.
1160 */
Damien Miller95def091999-11-25 00:26:21 +11001161 if (buffer_len(&stdin_buffer) == 0) {
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001162 packet_start(SSH_CMSG_EOF);
1163 packet_send();
Damien Miller95def091999-11-25 00:26:21 +11001164 }
Darren Tucker2fb66ca2008-06-13 04:49:33 +10001165 } else if (escape_char1 == SSH_ESCAPECHAR_NONE) {
Damien Miller5428f641999-11-25 11:54:57 +11001166 /*
1167 * Normal successful read, and no escape character.
1168 * Just append the data to buffer.
1169 */
Damien Miller95def091999-11-25 00:26:21 +11001170 buffer_append(&stdin_buffer, buf, len);
Damien Miller95def091999-11-25 00:26:21 +11001171 } else {
Damien Miller5428f641999-11-25 11:54:57 +11001172 /*
Darren Tucker4d5cd332008-06-13 04:51:14 +10001173 * Normal, successful read. But we have an escape
1174 * character and have to process the characters one
1175 * by one.
Damien Miller5428f641999-11-25 11:54:57 +11001176 */
Darren Tucker2fb66ca2008-06-13 04:49:33 +10001177 if (process_escapes(NULL, &stdin_buffer,
1178 &stdout_buffer, &stderr_buffer, buf, len) == -1)
Damien Millerad833b32000-08-23 10:46:23 +10001179 return;
Damien Miller95def091999-11-25 00:26:21 +11001180 }
1181 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001182}
1183
Ben Lindstrombba81212001-06-25 05:01:22 +00001184static void
Damien Miller90fdfaf2006-03-26 14:25:37 +11001185client_process_output(fd_set *writeset)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001186{
Damien Miller95def091999-11-25 00:26:21 +11001187 int len;
1188 char buf[100];
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001189
Damien Miller95def091999-11-25 00:26:21 +11001190 /* Write buffered output to stdout. */
1191 if (FD_ISSET(fileno(stdout), writeset)) {
1192 /* Write as much data as possible. */
1193 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
Damien Miller037a0dc1999-12-07 15:38:31 +11001194 buffer_len(&stdout_buffer));
Damien Miller95def091999-11-25 00:26:21 +11001195 if (len <= 0) {
Damien Millerd8968ad2008-07-04 23:10:49 +10001196 if (errno == EINTR || errno == EAGAIN ||
1197 errno == EWOULDBLOCK)
Damien Miller95def091999-11-25 00:26:21 +11001198 len = 0;
1199 else {
Damien Miller5428f641999-11-25 11:54:57 +11001200 /*
1201 * An error or EOF was encountered. Put an
1202 * error message to stderr buffer.
1203 */
Darren Tucker4d5cd332008-06-13 04:51:14 +10001204 snprintf(buf, sizeof buf,
1205 "write stdout: %.50s\r\n", strerror(errno));
Damien Miller95def091999-11-25 00:26:21 +11001206 buffer_append(&stderr_buffer, buf, strlen(buf));
Damien Miller95def091999-11-25 00:26:21 +11001207 quit_pending = 1;
1208 return;
1209 }
1210 }
1211 /* Consume printed data from the buffer. */
1212 buffer_consume(&stdout_buffer, len);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001213 }
Damien Miller95def091999-11-25 00:26:21 +11001214 /* Write buffered output to stderr. */
1215 if (FD_ISSET(fileno(stderr), writeset)) {
1216 /* Write as much data as possible. */
1217 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
Damien Miller037a0dc1999-12-07 15:38:31 +11001218 buffer_len(&stderr_buffer));
Damien Miller95def091999-11-25 00:26:21 +11001219 if (len <= 0) {
Damien Millerd8968ad2008-07-04 23:10:49 +10001220 if (errno == EINTR || errno == EAGAIN ||
1221 errno == EWOULDBLOCK)
Damien Miller95def091999-11-25 00:26:21 +11001222 len = 0;
1223 else {
Darren Tucker4d5cd332008-06-13 04:51:14 +10001224 /*
1225 * EOF or error, but can't even print
1226 * error message.
1227 */
Damien Miller95def091999-11-25 00:26:21 +11001228 quit_pending = 1;
1229 return;
1230 }
1231 }
1232 /* Consume printed characters from the buffer. */
1233 buffer_consume(&stderr_buffer, len);
1234 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001235}
1236
Damien Miller5428f641999-11-25 11:54:57 +11001237/*
Damien Millerb38eff82000-04-01 11:09:21 +10001238 * Get packets from the connection input buffer, and process them as long as
1239 * there are packets available.
1240 *
1241 * Any unknown packets received during the actual
1242 * session cause the session to terminate. This is
1243 * intended to make debugging easier since no
1244 * confirmations are sent. Any compatible protocol
1245 * extensions must be negotiated during the
1246 * preparatory phase.
1247 */
1248
Ben Lindstrombba81212001-06-25 05:01:22 +00001249static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00001250client_process_buffered_input_packets(void)
Damien Millerb38eff82000-04-01 11:09:21 +10001251{
Darren Tucker4d5cd332008-06-13 04:51:14 +10001252 dispatch_run(DISPATCH_NONBLOCK, &quit_pending,
1253 compat20 ? xxx_kex : NULL);
Damien Millerb38eff82000-04-01 11:09:21 +10001254}
1255
Damien Millerad833b32000-08-23 10:46:23 +10001256/* scan buf[] for '~' before sending data to the peer */
1257
Darren Tucker2fb66ca2008-06-13 04:49:33 +10001258/* Helper: allocate a new escape_filter_ctx and fill in its escape char */
1259void *
1260client_new_escape_filter_ctx(int escape_char)
1261{
1262 struct escape_filter_ctx *ret;
1263
1264 ret = xmalloc(sizeof(*ret));
1265 ret->escape_pending = 0;
1266 ret->escape_char = escape_char;
1267 return (void *)ret;
1268}
1269
Darren Tucker84c56f52008-06-13 04:55:46 +10001270/* Free the escape filter context on channel free */
1271void
1272client_filter_cleanup(int cid, void *ctx)
1273{
1274 xfree(ctx);
1275}
1276
Darren Tucker2fb66ca2008-06-13 04:49:33 +10001277int
1278client_simple_escape_filter(Channel *c, char *buf, int len)
Damien Millerad833b32000-08-23 10:46:23 +10001279{
Damien Miller5771ed72008-05-19 15:35:33 +10001280 if (c->extended_usage != CHAN_EXTENDED_WRITE)
1281 return 0;
1282
Darren Tucker2fb66ca2008-06-13 04:49:33 +10001283 return process_escapes(c, &c->input, &c->output, &c->extended,
1284 buf, len);
Damien Millerad833b32000-08-23 10:46:23 +10001285}
1286
Ben Lindstrombba81212001-06-25 05:01:22 +00001287static void
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001288client_channel_closed(int id, void *arg)
1289{
Damien Miller3ec27592001-10-12 11:35:04 +10001290 channel_cancel_cleanup(id);
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001291 session_closed = 1;
Darren Tucker9a2c4cd2003-09-22 21:16:05 +10001292 leave_raw_mode();
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001293}
1294
Damien Millerb38eff82000-04-01 11:09:21 +10001295/*
Damien Miller5428f641999-11-25 11:54:57 +11001296 * Implements the interactive session with the server. This is called after
1297 * the user has been authenticated, and a command has been started on the
Ben Lindstrom2b1f71b2001-06-05 20:32:21 +00001298 * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1299 * used as an escape character for terminating or suspending the session.
Damien Miller5428f641999-11-25 11:54:57 +11001300 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001301
Damien Miller4af51302000-04-16 11:18:38 +10001302int
Damien Millerad833b32000-08-23 10:46:23 +10001303client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001304{
Damien Miller5e953212001-01-30 09:14:00 +11001305 fd_set *readset = NULL, *writeset = NULL;
Damien Miller95def091999-11-25 00:26:21 +11001306 double start_time, total_time;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10001307 int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
Damien Millerb61f3fc2008-07-11 17:36:48 +10001308 u_int64_t ibytes, obytes;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10001309 u_int nalloc = 0;
Damien Miller95def091999-11-25 00:26:21 +11001310 char buf[100];
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001311
Damien Miller95def091999-11-25 00:26:21 +11001312 debug("Entering interactive session.");
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001313
Damien Miller95def091999-11-25 00:26:21 +11001314 start_time = get_current_time();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001315
Damien Miller95def091999-11-25 00:26:21 +11001316 /* Initialize variables. */
Darren Tucker2fb66ca2008-06-13 04:49:33 +10001317 escape_pending1 = 0;
Damien Miller95def091999-11-25 00:26:21 +11001318 last_was_cr = 1;
1319 exit_status = -1;
1320 stdin_eof = 0;
1321 buffer_high = 64 * 1024;
1322 connection_in = packet_get_connection_in();
1323 connection_out = packet_get_connection_out();
Damien Miller5e953212001-01-30 09:14:00 +11001324 max_fd = MAX(connection_in, connection_out);
Damien Millerb1cbfa22008-05-19 16:00:08 +10001325 if (muxserver_sock != -1)
1326 max_fd = MAX(max_fd, muxserver_sock);
Damien Miller5e953212001-01-30 09:14:00 +11001327
1328 if (!compat20) {
Ben Lindstrom302ea6f2001-04-16 02:01:25 +00001329 /* enable nonblocking unless tty */
1330 if (!isatty(fileno(stdin)))
1331 set_nonblock(fileno(stdin));
1332 if (!isatty(fileno(stdout)))
1333 set_nonblock(fileno(stdout));
1334 if (!isatty(fileno(stderr)))
1335 set_nonblock(fileno(stderr));
Damien Miller5e953212001-01-30 09:14:00 +11001336 max_fd = MAX(max_fd, fileno(stdin));
1337 max_fd = MAX(max_fd, fileno(stdout));
1338 max_fd = MAX(max_fd, fileno(stderr));
1339 }
Damien Miller95def091999-11-25 00:26:21 +11001340 quit_pending = 0;
Darren Tucker2fb66ca2008-06-13 04:49:33 +10001341 escape_char1 = escape_char_arg;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001342
Damien Miller95def091999-11-25 00:26:21 +11001343 /* Initialize buffers. */
1344 buffer_init(&stdin_buffer);
1345 buffer_init(&stdout_buffer);
1346 buffer_init(&stderr_buffer);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001347
Damien Millerb38eff82000-04-01 11:09:21 +10001348 client_init_dispatch();
1349
Ben Lindstromf49dbff2002-12-23 02:01:55 +00001350 /*
1351 * Set signal handlers, (e.g. to restore non-blocking mode)
1352 * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1353 */
Darren Tucker07336da2004-11-05 20:02:16 +11001354 if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1355 signal(SIGHUP, signal_handler);
Ben Lindstromf49dbff2002-12-23 02:01:55 +00001356 if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1357 signal(SIGINT, signal_handler);
1358 if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1359 signal(SIGQUIT, signal_handler);
1360 if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1361 signal(SIGTERM, signal_handler);
Darren Tucker5d78de62004-11-05 20:35:44 +11001362 signal(SIGWINCH, window_change_handler);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001363
Damien Miller95def091999-11-25 00:26:21 +11001364 if (have_pty)
1365 enter_raw_mode();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001366
Ben Lindstrom5b828322001-02-09 01:34:36 +00001367 if (compat20) {
1368 session_ident = ssh2_chan_id;
Darren Tucker2fb66ca2008-06-13 04:49:33 +10001369 if (escape_char_arg != SSH_ESCAPECHAR_NONE)
Ben Lindstrom5b828322001-02-09 01:34:36 +00001370 channel_register_filter(session_ident,
Darren Tucker2fb66ca2008-06-13 04:49:33 +10001371 client_simple_escape_filter, NULL,
Darren Tucker84c56f52008-06-13 04:55:46 +10001372 client_filter_cleanup,
Darren Tucker2fb66ca2008-06-13 04:49:33 +10001373 client_new_escape_filter_ctx(escape_char_arg));
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001374 if (session_ident != -1)
1375 channel_register_cleanup(session_ident,
Damien Miller39eda6e2005-11-05 14:52:50 +11001376 client_channel_closed, 0);
Ben Lindstrom5b828322001-02-09 01:34:36 +00001377 } else {
1378 /* Check if we should immediately send eof on stdin. */
Damien Miller1383bd82000-04-06 12:32:37 +10001379 client_check_initial_eof_on_stdin();
Ben Lindstrom5b828322001-02-09 01:34:36 +00001380 }
Damien Millerad833b32000-08-23 10:46:23 +10001381
Damien Miller95def091999-11-25 00:26:21 +11001382 /* Main loop of the client for the interactive session mode. */
1383 while (!quit_pending) {
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001384
Damien Miller5428f641999-11-25 11:54:57 +11001385 /* Process buffered packets sent by the server. */
Damien Miller95def091999-11-25 00:26:21 +11001386 client_process_buffered_input_packets();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001387
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001388 if (compat20 && session_closed && !channel_still_open())
Damien Miller1383bd82000-04-06 12:32:37 +10001389 break;
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001390
1391 rekeying = (xxx_kex != NULL && !xxx_kex->done);
Damien Miller1383bd82000-04-06 12:32:37 +10001392
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001393 if (rekeying) {
1394 debug("rekeying in progress");
1395 } else {
1396 /*
1397 * Make packets of buffered stdin data, and buffer
1398 * them for sending to the server.
1399 */
1400 if (!compat20)
1401 client_make_packets_from_stdin_data();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001402
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001403 /*
1404 * Make packets from buffered channel data, and
1405 * enqueue them for sending to the server.
1406 */
1407 if (packet_not_very_much_data_to_write())
1408 channel_output_poll();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001409
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001410 /*
1411 * Check if the window size has changed, and buffer a
1412 * message about it to the server if so.
1413 */
1414 client_check_window_change();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001415
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001416 if (quit_pending)
1417 break;
1418 }
Damien Miller5428f641999-11-25 11:54:57 +11001419 /*
1420 * Wait until we have something to do (something becomes
1421 * available on one of the descriptors).
1422 */
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001423 max_fd2 = max_fd;
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001424 client_wait_until_can_do_something(&readset, &writeset,
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001425 &max_fd2, &nalloc, rekeying);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001426
Damien Miller95def091999-11-25 00:26:21 +11001427 if (quit_pending)
1428 break;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001429
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001430 /* Do channel operations unless rekeying in progress. */
1431 if (!rekeying) {
1432 channel_after_select(readset, writeset);
Damien Millera5539d22003-04-09 20:50:06 +10001433 if (need_rekeying || packet_need_rekeying()) {
1434 debug("need rekeying");
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001435 xxx_kex->done = 0;
1436 kex_send_kexinit(xxx_kex);
1437 need_rekeying = 0;
1438 }
1439 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001440
Damien Miller1383bd82000-04-06 12:32:37 +10001441 /* Buffer input from the connection. */
Damien Miller5e953212001-01-30 09:14:00 +11001442 client_process_net_input(readset);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001443
Damien Miller0e220db2004-06-15 10:34:08 +10001444 /* Accept control connections. */
Damien Millerb1cbfa22008-05-19 16:00:08 +10001445 if (muxserver_sock != -1 &&FD_ISSET(muxserver_sock, readset)) {
1446 if (muxserver_accept_control())
1447 quit_pending = 1;
1448 }
Damien Miller0e220db2004-06-15 10:34:08 +10001449
Damien Miller1383bd82000-04-06 12:32:37 +10001450 if (quit_pending)
1451 break;
1452
1453 if (!compat20) {
1454 /* Buffer data from stdin */
Damien Miller5e953212001-01-30 09:14:00 +11001455 client_process_input(readset);
Damien Miller1383bd82000-04-06 12:32:37 +10001456 /*
1457 * Process output to stdout and stderr. Output to
1458 * the connection is processed elsewhere (above).
1459 */
Damien Miller5e953212001-01-30 09:14:00 +11001460 client_process_output(writeset);
Damien Miller1383bd82000-04-06 12:32:37 +10001461 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001462
Darren Tucker4d5cd332008-06-13 04:51:14 +10001463 /*
1464 * Send as much buffered packet data as possible to the
1465 * sender.
1466 */
Damien Miller5e953212001-01-30 09:14:00 +11001467 if (FD_ISSET(connection_out, writeset))
Damien Miller95def091999-11-25 00:26:21 +11001468 packet_write_poll();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001469 }
Damien Miller5e953212001-01-30 09:14:00 +11001470 if (readset)
1471 xfree(readset);
1472 if (writeset)
1473 xfree(writeset);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001474
Damien Miller95def091999-11-25 00:26:21 +11001475 /* Terminate the session. */
1476
1477 /* Stop watching for window change. */
Darren Tucker5d78de62004-11-05 20:35:44 +11001478 signal(SIGWINCH, SIG_DFL);
Damien Miller95def091999-11-25 00:26:21 +11001479
Darren Tuckerde0c0252009-07-06 07:17:35 +10001480 if (compat20) {
1481 packet_start(SSH2_MSG_DISCONNECT);
1482 packet_put_int(SSH2_DISCONNECT_BY_APPLICATION);
1483 packet_put_cstring("disconnected by user");
1484 packet_send();
1485 packet_write_wait();
1486 }
Darren Tucker12b4a652009-06-21 18:14:48 +10001487
Ben Lindstrom601e4362001-06-21 03:19:23 +00001488 channel_free_all();
Damien Miller95def091999-11-25 00:26:21 +11001489
Ben Lindstromec46e0b2001-06-09 01:27:31 +00001490 if (have_pty)
1491 leave_raw_mode();
Ben Lindstromc93e84c2001-05-12 00:08:37 +00001492
1493 /* restore blocking io */
1494 if (!isatty(fileno(stdin)))
1495 unset_nonblock(fileno(stdin));
1496 if (!isatty(fileno(stdout)))
1497 unset_nonblock(fileno(stdout));
1498 if (!isatty(fileno(stderr)))
1499 unset_nonblock(fileno(stderr));
1500
Damien Millerd6965512003-12-17 16:31:53 +11001501 /*
1502 * If there was no shell or command requested, there will be no remote
1503 * exit status to be returned. In that case, clear error code if the
1504 * connection was deliberately terminated at this end.
1505 */
1506 if (no_shell_flag && received_signal == SIGTERM) {
1507 received_signal = 0;
1508 exit_status = 0;
1509 }
1510
Darren Tucker9a2c4cd2003-09-22 21:16:05 +10001511 if (received_signal)
Ben Lindstromf8f065b2001-12-06 17:52:16 +00001512 fatal("Killed by signal %d.", (int) received_signal);
Ben Lindstromec46e0b2001-06-09 01:27:31 +00001513
1514 /*
1515 * In interactive mode (with pseudo tty) display a message indicating
1516 * that the connection has been closed.
1517 */
1518 if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
Darren Tucker4d5cd332008-06-13 04:51:14 +10001519 snprintf(buf, sizeof buf,
1520 "Connection to %.64s closed.\r\n", host);
Ben Lindstromec46e0b2001-06-09 01:27:31 +00001521 buffer_append(&stderr_buffer, buf, strlen(buf));
1522 }
1523
Damien Miller95def091999-11-25 00:26:21 +11001524 /* Output any buffered data for stdout. */
Ben Lindstromc93e84c2001-05-12 00:08:37 +00001525 while (buffer_len(&stdout_buffer) > 0) {
1526 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
Damien Miller037a0dc1999-12-07 15:38:31 +11001527 buffer_len(&stdout_buffer));
Ben Lindstromc93e84c2001-05-12 00:08:37 +00001528 if (len <= 0) {
Damien Miller95def091999-11-25 00:26:21 +11001529 error("Write failed flushing stdout buffer.");
Ben Lindstromc93e84c2001-05-12 00:08:37 +00001530 break;
1531 }
Damien Miller95def091999-11-25 00:26:21 +11001532 buffer_consume(&stdout_buffer, len);
1533 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001534
Damien Miller95def091999-11-25 00:26:21 +11001535 /* Output any buffered data for stderr. */
Ben Lindstromc93e84c2001-05-12 00:08:37 +00001536 while (buffer_len(&stderr_buffer) > 0) {
1537 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
Damien Miller037a0dc1999-12-07 15:38:31 +11001538 buffer_len(&stderr_buffer));
Ben Lindstromc93e84c2001-05-12 00:08:37 +00001539 if (len <= 0) {
Damien Miller95def091999-11-25 00:26:21 +11001540 error("Write failed flushing stderr buffer.");
Ben Lindstromc93e84c2001-05-12 00:08:37 +00001541 break;
1542 }
Damien Miller95def091999-11-25 00:26:21 +11001543 buffer_consume(&stderr_buffer, len);
1544 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001545
Damien Miller95def091999-11-25 00:26:21 +11001546 /* Clear and free any buffers. */
1547 memset(buf, 0, sizeof(buf));
1548 buffer_free(&stdin_buffer);
1549 buffer_free(&stdout_buffer);
1550 buffer_free(&stderr_buffer);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001551
Damien Miller95def091999-11-25 00:26:21 +11001552 /* Report bytes transferred, and transfer rates. */
1553 total_time = get_current_time() - start_time;
Damien Millerb61f3fc2008-07-11 17:36:48 +10001554 packet_get_state(MODE_IN, NULL, NULL, NULL, &ibytes);
1555 packet_get_state(MODE_OUT, NULL, NULL, NULL, &obytes);
1556 verbose("Transferred: sent %llu, received %llu bytes, in %.1f seconds",
1557 obytes, ibytes, total_time);
Damien Miller95def091999-11-25 00:26:21 +11001558 if (total_time > 0)
Damien Millerb61f3fc2008-07-11 17:36:48 +10001559 verbose("Bytes per second: sent %.1f, received %.1f",
1560 obytes / total_time, ibytes / total_time);
Damien Miller95def091999-11-25 00:26:21 +11001561 /* Return the exit status of the program. */
1562 debug("Exit status %d", exit_status);
1563 return exit_status;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001564}
Damien Millerb38eff82000-04-01 11:09:21 +10001565
1566/*********/
1567
Ben Lindstrombba81212001-06-25 05:01:22 +00001568static void
Damien Miller630d6f42002-01-22 23:17:30 +11001569client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10001570{
Ben Lindstrom46c16222000-12-22 01:43:59 +00001571 u_int data_len;
Damien Millerb38eff82000-04-01 11:09:21 +10001572 char *data = packet_get_string(&data_len);
Damien Miller48b03fc2002-01-22 23:11:40 +11001573 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10001574 buffer_append(&stdout_buffer, data, data_len);
Damien Millerb38eff82000-04-01 11:09:21 +10001575 memset(data, 0, data_len);
1576 xfree(data);
1577}
Ben Lindstrombba81212001-06-25 05:01:22 +00001578static void
Damien Miller630d6f42002-01-22 23:17:30 +11001579client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10001580{
Ben Lindstrom46c16222000-12-22 01:43:59 +00001581 u_int data_len;
Damien Millerb38eff82000-04-01 11:09:21 +10001582 char *data = packet_get_string(&data_len);
Damien Miller48b03fc2002-01-22 23:11:40 +11001583 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10001584 buffer_append(&stderr_buffer, data, data_len);
Damien Millerb38eff82000-04-01 11:09:21 +10001585 memset(data, 0, data_len);
1586 xfree(data);
1587}
Ben Lindstrombba81212001-06-25 05:01:22 +00001588static void
Damien Miller630d6f42002-01-22 23:17:30 +11001589client_input_exit_status(int type, u_int32_t seq, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10001590{
Damien Millerb38eff82000-04-01 11:09:21 +10001591 exit_status = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11001592 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10001593 /* Acknowledge the exit. */
1594 packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1595 packet_send();
1596 /*
1597 * Must wait for packet to be sent since we are
1598 * exiting the loop.
1599 */
1600 packet_write_wait();
1601 /* Flag that we want to exit. */
1602 quit_pending = 1;
1603}
Darren Tucker5dcdd212003-10-02 16:17:00 +10001604static void
1605client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1606{
1607 Channel *c = NULL;
1608 int remote_id, sock;
1609
1610 /* Read the remote channel number from the message. */
1611 remote_id = packet_get_int();
1612 packet_check_eom();
1613
1614 /*
1615 * Get a connection to the local authentication agent (this may again
1616 * get forwarded).
1617 */
1618 sock = ssh_get_authentication_socket();
1619
1620 /*
1621 * If we could not connect the agent, send an error message back to
1622 * the server. This should never happen unless the agent dies,
1623 * because authentication forwarding is only enabled if we have an
1624 * agent.
1625 */
1626 if (sock >= 0) {
1627 c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1628 -1, 0, 0, 0, "authentication agent connection", 1);
1629 c->remote_id = remote_id;
1630 c->force_drain = 1;
1631 }
1632 if (c == NULL) {
1633 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1634 packet_put_int(remote_id);
1635 } else {
1636 /* Send a confirmation to the remote host. */
1637 debug("Forwarding authentication connection.");
1638 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1639 packet_put_int(remote_id);
1640 packet_put_int(c->self);
1641 }
1642 packet_send();
1643}
Damien Millerb38eff82000-04-01 11:09:21 +10001644
Ben Lindstrombba81212001-06-25 05:01:22 +00001645static Channel *
Damien Miller0bc1bd82000-11-13 22:57:25 +11001646client_request_forwarded_tcpip(const char *request_type, int rchan)
1647{
Ben Lindstroma962c2f2002-07-04 00:14:17 +00001648 Channel *c = NULL;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001649 char *listen_address, *originator_address;
Damien Miller3dc71ad2009-01-28 16:31:22 +11001650 u_short listen_port, originator_port;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001651
1652 /* Get rest of the packet */
1653 listen_address = packet_get_string(NULL);
1654 listen_port = packet_get_int();
1655 originator_address = packet_get_string(NULL);
1656 originator_port = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11001657 packet_check_eom();
Damien Miller0bc1bd82000-11-13 22:57:25 +11001658
Damien Millerbd740252008-05-19 15:37:09 +10001659 debug("client_request_forwarded_tcpip: listen %s port %d, "
1660 "originator %s port %d", listen_address, listen_port,
1661 originator_address, originator_port);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001662
Damien Millerbd740252008-05-19 15:37:09 +10001663 c = channel_connect_by_listen_address(listen_port,
1664 "forwarded-tcpip", originator_address);
1665
Damien Miller0bc1bd82000-11-13 22:57:25 +11001666 xfree(originator_address);
1667 xfree(listen_address);
1668 return c;
1669}
1670
Ben Lindstroma962c2f2002-07-04 00:14:17 +00001671static Channel *
Damien Miller0bc1bd82000-11-13 22:57:25 +11001672client_request_x11(const char *request_type, int rchan)
1673{
1674 Channel *c = NULL;
1675 char *originator;
Damien Miller3dc71ad2009-01-28 16:31:22 +11001676 u_short originator_port;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001677 int sock;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001678
1679 if (!options.forward_x11) {
1680 error("Warning: ssh server tried X11 forwarding.");
Darren Tucker4d5cd332008-06-13 04:51:14 +10001681 error("Warning: this is probably a break-in attempt by a "
1682 "malicious server.");
Damien Miller0bc1bd82000-11-13 22:57:25 +11001683 return NULL;
1684 }
1685 originator = packet_get_string(NULL);
1686 if (datafellows & SSH_BUG_X11FWD) {
1687 debug2("buggy server: x11 request w/o originator_port");
1688 originator_port = 0;
1689 } else {
1690 originator_port = packet_get_int();
1691 }
Damien Miller48b03fc2002-01-22 23:11:40 +11001692 packet_check_eom();
Damien Miller0bc1bd82000-11-13 22:57:25 +11001693 /* XXX check permission */
Damien Millerd83ff352001-01-30 09:19:34 +11001694 debug("client_request_x11: request from %s %d", originator,
1695 originator_port);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001696 xfree(originator);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001697 sock = x11_connect_display();
1698 if (sock < 0)
1699 return NULL;
1700 c = channel_new("x11",
1701 SSH_CHANNEL_X11_OPEN, sock, sock, -1,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001702 CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
Ben Lindstrom944c4f02001-09-18 05:51:13 +00001703 c->force_drain = 1;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001704 return c;
1705}
1706
Ben Lindstroma962c2f2002-07-04 00:14:17 +00001707static Channel *
Damien Miller0bc1bd82000-11-13 22:57:25 +11001708client_request_agent(const char *request_type, int rchan)
1709{
1710 Channel *c = NULL;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001711 int sock;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001712
1713 if (!options.forward_agent) {
1714 error("Warning: ssh server tried agent forwarding.");
Darren Tucker4d5cd332008-06-13 04:51:14 +10001715 error("Warning: this is probably a break-in attempt by a "
1716 "malicious server.");
Damien Miller0bc1bd82000-11-13 22:57:25 +11001717 return NULL;
1718 }
Darren Tucker82a3d2b2007-02-19 22:10:25 +11001719 sock = ssh_get_authentication_socket();
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001720 if (sock < 0)
1721 return NULL;
1722 c = channel_new("authentication agent connection",
1723 SSH_CHANNEL_OPEN, sock, sock, -1,
Darren Tucker5baa1702007-12-29 09:37:10 +11001724 CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001725 "authentication agent connection", 1);
Ben Lindstrom944c4f02001-09-18 05:51:13 +00001726 c->force_drain = 1;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001727 return c;
1728}
1729
Damien Millerb3ce9fe2007-08-08 14:32:41 +10001730int
1731client_request_tun_fwd(int tun_mode, int local_tun, int remote_tun)
1732{
1733 Channel *c;
1734 int fd;
1735
1736 if (tun_mode == SSH_TUNMODE_NO)
1737 return 0;
1738
1739 if (!compat20) {
Damien Millerb3f2c9f2009-01-28 16:15:30 +11001740 error("Tunnel forwarding is not supported for protocol 1");
Damien Millerb3ce9fe2007-08-08 14:32:41 +10001741 return -1;
1742 }
1743
1744 debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
1745
1746 /* Open local tunnel device */
1747 if ((fd = tun_open(local_tun, tun_mode)) == -1) {
1748 error("Tunnel device open failed.");
1749 return -1;
1750 }
1751
1752 c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1753 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1);
1754 c->datagram = 1;
1755
1756#if defined(SSH_TUN_FILTER)
1757 if (options.tun_open == SSH_TUNMODE_POINTOPOINT)
1758 channel_register_filter(c->self, sys_tun_infilter,
Darren Tucker1cf65ae2008-06-13 05:09:18 +10001759 sys_tun_outfilter, NULL, NULL);
Damien Millerb3ce9fe2007-08-08 14:32:41 +10001760#endif
1761
1762 packet_start(SSH2_MSG_CHANNEL_OPEN);
1763 packet_put_cstring("tun@openssh.com");
1764 packet_put_int(c->self);
1765 packet_put_int(c->local_window_max);
1766 packet_put_int(c->local_maxpacket);
1767 packet_put_int(tun_mode);
1768 packet_put_int(remote_tun);
1769 packet_send();
1770
1771 return 0;
1772}
1773
Damien Millerbd483e72000-04-30 10:00:53 +10001774/* XXXX move to generic input handler */
Ben Lindstrombba81212001-06-25 05:01:22 +00001775static void
Damien Miller630d6f42002-01-22 23:17:30 +11001776client_input_channel_open(int type, u_int32_t seq, void *ctxt)
Damien Millerbd483e72000-04-30 10:00:53 +10001777{
1778 Channel *c = NULL;
1779 char *ctype;
Damien Millerbd483e72000-04-30 10:00:53 +10001780 int rchan;
Ben Lindstrom4fed2be2002-06-25 23:17:36 +00001781 u_int rmaxpack, rwindow, len;
Damien Millerbd483e72000-04-30 10:00:53 +10001782
1783 ctype = packet_get_string(&len);
1784 rchan = packet_get_int();
1785 rwindow = packet_get_int();
1786 rmaxpack = packet_get_int();
1787
Damien Millere247cc42000-05-07 12:03:14 +10001788 debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
Damien Millerbd483e72000-04-30 10:00:53 +10001789 ctype, rchan, rwindow, rmaxpack);
1790
Damien Miller0bc1bd82000-11-13 22:57:25 +11001791 if (strcmp(ctype, "forwarded-tcpip") == 0) {
1792 c = client_request_forwarded_tcpip(ctype, rchan);
1793 } else if (strcmp(ctype, "x11") == 0) {
1794 c = client_request_x11(ctype, rchan);
1795 } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1796 c = client_request_agent(ctype, rchan);
Damien Millerbd483e72000-04-30 10:00:53 +10001797 }
1798/* XXX duplicate : */
1799 if (c != NULL) {
1800 debug("confirm %s", ctype);
1801 c->remote_id = rchan;
1802 c->remote_window = rwindow;
1803 c->remote_maxpacket = rmaxpack;
Ben Lindstroma69d89b2001-05-09 00:01:18 +00001804 if (c->type != SSH_CHANNEL_CONNECTING) {
1805 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1806 packet_put_int(c->remote_id);
1807 packet_put_int(c->self);
1808 packet_put_int(c->local_window);
1809 packet_put_int(c->local_maxpacket);
1810 packet_send();
1811 }
Damien Millerbd483e72000-04-30 10:00:53 +10001812 } else {
1813 debug("failure %s", ctype);
1814 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1815 packet_put_int(rchan);
1816 packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
Ben Lindstromf3436742001-04-29 19:52:00 +00001817 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
Ben Lindstroma69d89b2001-05-09 00:01:18 +00001818 packet_put_cstring("open failed");
Ben Lindstromf3436742001-04-29 19:52:00 +00001819 packet_put_cstring("");
1820 }
Damien Millerbd483e72000-04-30 10:00:53 +10001821 packet_send();
1822 }
1823 xfree(ctype);
1824}
Ben Lindstrombba81212001-06-25 05:01:22 +00001825static void
Damien Miller630d6f42002-01-22 23:17:30 +11001826client_input_channel_req(int type, u_int32_t seq, void *ctxt)
Ben Lindstrom5b828322001-02-09 01:34:36 +00001827{
1828 Channel *c = NULL;
Damien Miller0e220db2004-06-15 10:34:08 +10001829 int exitval, id, reply, success = 0;
Ben Lindstrom5b828322001-02-09 01:34:36 +00001830 char *rtype;
1831
1832 id = packet_get_int();
1833 rtype = packet_get_string(NULL);
1834 reply = packet_get_char();
1835
1836 debug("client_input_channel_req: channel %d rtype %s reply %d",
1837 id, rtype, reply);
1838
Damien Miller3bbd8782004-06-18 22:23:22 +10001839 if (id == -1) {
1840 error("client_input_channel_req: request for channel -1");
1841 } else if ((c = channel_lookup(id)) == NULL) {
Darren Tucker4d5cd332008-06-13 04:51:14 +10001842 error("client_input_channel_req: channel %d: "
1843 "unknown channel", id);
Damien Millerbab9bd42008-05-19 16:06:47 +10001844 } else if (strcmp(rtype, "eow@openssh.com") == 0) {
1845 packet_check_eom();
1846 chan_rcvd_eow(c);
Ben Lindstrom5b828322001-02-09 01:34:36 +00001847 } else if (strcmp(rtype, "exit-status") == 0) {
Damien Miller0e220db2004-06-15 10:34:08 +10001848 exitval = packet_get_int();
1849 if (id == session_ident) {
1850 success = 1;
1851 exit_status = exitval;
1852 } else if (c->ctl_fd == -1) {
1853 error("client_input_channel_req: unexpected channel %d",
1854 session_ident);
1855 } else {
1856 atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1857 success = 1;
1858 }
Damien Miller48b03fc2002-01-22 23:11:40 +11001859 packet_check_eom();
Ben Lindstrom5b828322001-02-09 01:34:36 +00001860 }
1861 if (reply) {
1862 packet_start(success ?
1863 SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
Damien Miller8533c782008-12-08 09:54:40 +11001864 packet_put_int(c->remote_id);
Ben Lindstrom5b828322001-02-09 01:34:36 +00001865 packet_send();
1866 }
1867 xfree(rtype);
1868}
Damien Millerc3fa4072002-01-22 23:21:58 +11001869static void
1870client_input_global_request(int type, u_int32_t seq, void *ctxt)
1871{
1872 char *rtype;
1873 int want_reply;
1874 int success = 0;
1875
1876 rtype = packet_get_string(NULL);
1877 want_reply = packet_get_char();
Damien Miller509b0102003-12-17 16:33:10 +11001878 debug("client_input_global_request: rtype %s want_reply %d",
1879 rtype, want_reply);
Damien Millerc3fa4072002-01-22 23:21:58 +11001880 if (want_reply) {
1881 packet_start(success ?
1882 SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1883 packet_send();
1884 packet_write_wait();
1885 }
1886 xfree(rtype);
1887}
Damien Millerbd483e72000-04-30 10:00:53 +10001888
Damien Miller0e220db2004-06-15 10:34:08 +10001889void
Darren Tuckerfc959702004-07-17 16:12:08 +10001890client_session2_setup(int id, int want_tty, int want_subsystem,
Damien Miller5771ed72008-05-19 15:35:33 +10001891 const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env)
Damien Miller0e220db2004-06-15 10:34:08 +10001892{
1893 int len;
Darren Tucker5d78de62004-11-05 20:35:44 +11001894 Channel *c = NULL;
Damien Miller0e220db2004-06-15 10:34:08 +10001895
1896 debug2("%s: id %d", __func__, id);
1897
Darren Tucker5d78de62004-11-05 20:35:44 +11001898 if ((c = channel_lookup(id)) == NULL)
1899 fatal("client_session2_setup: channel %d: unknown channel", id);
1900
Damien Miller0e220db2004-06-15 10:34:08 +10001901 if (want_tty) {
1902 struct winsize ws;
Damien Miller0e220db2004-06-15 10:34:08 +10001903
1904 /* Store window size in the packet. */
1905 if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1906 memset(&ws, 0, sizeof(ws));
1907
Damien Miller5771ed72008-05-19 15:35:33 +10001908 channel_request_start(id, "pty-req", 1);
1909 client_expect_confirm(id, "PTY allocation", 0);
Damien Miller0e220db2004-06-15 10:34:08 +10001910 packet_put_cstring(term != NULL ? term : "");
Damien Miller71a73672006-03-26 14:04:36 +11001911 packet_put_int((u_int)ws.ws_col);
1912 packet_put_int((u_int)ws.ws_row);
1913 packet_put_int((u_int)ws.ws_xpixel);
1914 packet_put_int((u_int)ws.ws_ypixel);
Darren Tuckerdf189fb2008-06-08 12:55:32 +10001915 if (tiop == NULL)
1916 tiop = get_saved_tio();
1917 tty_make_modes(-1, tiop);
Damien Miller0e220db2004-06-15 10:34:08 +10001918 packet_send();
1919 /* XXX wait for reply */
Darren Tucker5d78de62004-11-05 20:35:44 +11001920 c->client_tty = 1;
Damien Miller0e220db2004-06-15 10:34:08 +10001921 }
1922
1923 /* Transfer any environment variables from client to server */
Damien Miller3756dce2004-06-18 01:17:29 +10001924 if (options.num_send_env != 0 && env != NULL) {
Damien Miller0e220db2004-06-15 10:34:08 +10001925 int i, j, matched;
Damien Miller0e220db2004-06-15 10:34:08 +10001926 char *name, *val;
1927
1928 debug("Sending environment.");
Damien Miller3756dce2004-06-18 01:17:29 +10001929 for (i = 0; env[i] != NULL; i++) {
Damien Miller0e220db2004-06-15 10:34:08 +10001930 /* Split */
Damien Miller3756dce2004-06-18 01:17:29 +10001931 name = xstrdup(env[i]);
Damien Miller0e220db2004-06-15 10:34:08 +10001932 if ((val = strchr(name, '=')) == NULL) {
Damien Miller0a0176e2005-11-05 15:07:59 +11001933 xfree(name);
Damien Miller0e220db2004-06-15 10:34:08 +10001934 continue;
1935 }
1936 *val++ = '\0';
1937
1938 matched = 0;
1939 for (j = 0; j < options.num_send_env; j++) {
1940 if (match_pattern(name, options.send_env[j])) {
1941 matched = 1;
1942 break;
1943 }
1944 }
1945 if (!matched) {
1946 debug3("Ignored env %s", name);
Damien Miller0a0176e2005-11-05 15:07:59 +11001947 xfree(name);
Damien Miller0e220db2004-06-15 10:34:08 +10001948 continue;
1949 }
1950
1951 debug("Sending env %s = %s", name, val);
1952 channel_request_start(id, "env", 0);
1953 packet_put_cstring(name);
1954 packet_put_cstring(val);
1955 packet_send();
Damien Miller0a0176e2005-11-05 15:07:59 +11001956 xfree(name);
Damien Miller0e220db2004-06-15 10:34:08 +10001957 }
1958 }
1959
1960 len = buffer_len(cmd);
1961 if (len > 0) {
1962 if (len > 900)
1963 len = 900;
1964 if (want_subsystem) {
Damien Miller5771ed72008-05-19 15:35:33 +10001965 debug("Sending subsystem: %.*s",
1966 len, (u_char*)buffer_ptr(cmd));
1967 channel_request_start(id, "subsystem", 1);
1968 client_expect_confirm(id, "subsystem", 1);
Damien Miller0e220db2004-06-15 10:34:08 +10001969 } else {
Damien Miller5771ed72008-05-19 15:35:33 +10001970 debug("Sending command: %.*s",
1971 len, (u_char*)buffer_ptr(cmd));
1972 channel_request_start(id, "exec", 1);
1973 client_expect_confirm(id, "exec", 1);
Damien Miller0e220db2004-06-15 10:34:08 +10001974 }
1975 packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
1976 packet_send();
1977 } else {
Damien Miller5771ed72008-05-19 15:35:33 +10001978 channel_request_start(id, "shell", 1);
1979 client_expect_confirm(id, "shell", 1);
Damien Miller0e220db2004-06-15 10:34:08 +10001980 packet_send();
1981 }
1982}
1983
Ben Lindstrombba81212001-06-25 05:01:22 +00001984static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00001985client_init_dispatch_20(void)
Damien Miller1383bd82000-04-06 12:32:37 +10001986{
Ben Lindstrom8ac91062001-04-04 17:57:54 +00001987 dispatch_init(&dispatch_protocol_error);
Damien Miller2797f7f2002-04-23 21:09:44 +10001988
Damien Miller1383bd82000-04-06 12:32:37 +10001989 dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1990 dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1991 dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1992 dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
Damien Millerbd483e72000-04-30 10:00:53 +10001993 dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
Damien Miller1383bd82000-04-06 12:32:37 +10001994 dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1995 dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
Ben Lindstrom5b828322001-02-09 01:34:36 +00001996 dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
Damien Miller1383bd82000-04-06 12:32:37 +10001997 dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
Damien Millerb84886b2008-05-19 15:05:07 +10001998 dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm);
1999 dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm);
Damien Millerc3fa4072002-01-22 23:21:58 +11002000 dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
Ben Lindstrom8ac91062001-04-04 17:57:54 +00002001
2002 /* rekeying */
2003 dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
Damien Miller2797f7f2002-04-23 21:09:44 +10002004
2005 /* global request reply messages */
2006 dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
2007 dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
Damien Miller1383bd82000-04-06 12:32:37 +10002008}
Darren Tucker4d5cd332008-06-13 04:51:14 +10002009
Ben Lindstrombba81212001-06-25 05:01:22 +00002010static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00002011client_init_dispatch_13(void)
Damien Millerb38eff82000-04-01 11:09:21 +10002012{
2013 dispatch_init(NULL);
2014 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
2015 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
2016 dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
Damien Millerb38eff82000-04-01 11:09:21 +10002017 dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
2018 dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
2019 dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
Damien Millerb38eff82000-04-01 11:09:21 +10002020 dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
2021 dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
2022 dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
Damien Miller69b69aa2000-10-28 14:19:58 +11002023
2024 dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
Darren Tucker5dcdd212003-10-02 16:17:00 +10002025 &client_input_agent_open : &deny_input_open);
Damien Miller69b69aa2000-10-28 14:19:58 +11002026 dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
2027 &x11_input_open : &deny_input_open);
Damien Millerb38eff82000-04-01 11:09:21 +10002028}
Darren Tucker4d5cd332008-06-13 04:51:14 +10002029
Ben Lindstrombba81212001-06-25 05:01:22 +00002030static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00002031client_init_dispatch_15(void)
Damien Millerb38eff82000-04-01 11:09:21 +10002032{
2033 client_init_dispatch_13();
2034 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2035 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2036}
Darren Tucker4d5cd332008-06-13 04:51:14 +10002037
Ben Lindstromdb47f382001-07-04 05:10:27 +00002038static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00002039client_init_dispatch(void)
Damien Millerb38eff82000-04-01 11:09:21 +10002040{
Damien Miller1383bd82000-04-06 12:32:37 +10002041 if (compat20)
2042 client_init_dispatch_20();
2043 else if (compat13)
Damien Millerb38eff82000-04-01 11:09:21 +10002044 client_init_dispatch_13();
2045 else
2046 client_init_dispatch_15();
2047}
Darren Tucker9a2c4cd2003-09-22 21:16:05 +10002048
2049/* client specific fatal cleanup */
2050void
Darren Tucker3e33cec2003-10-02 16:12:36 +10002051cleanup_exit(int i)
Darren Tucker9a2c4cd2003-09-22 21:16:05 +10002052{
Darren Tucker9a2c4cd2003-09-22 21:16:05 +10002053 leave_raw_mode();
2054 leave_non_blocking();
Damien Millerb1cbfa22008-05-19 16:00:08 +10002055 if (options.control_path != NULL && muxserver_sock != -1)
Damien Miller0e220db2004-06-15 10:34:08 +10002056 unlink(options.control_path);
Darren Tucker3e33cec2003-10-02 16:12:36 +10002057 _exit(i);
Darren Tucker9a2c4cd2003-09-22 21:16:05 +10002058}