blob: fb66a6e401424bed8cd4d58587566979a4cc4d63 [file] [log] [blame]
Damien Miller57e8ad32006-07-10 20:20:52 +10001/* $OpenBSD: clientloop.c,v 1.165 2006/07/02 23:01:55 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>
65#ifdef HAVE_SYS_STAT_H
66# include <sys/stat.h>
67#endif
Damien Miller17e91c02006-03-15 11:28:34 +110068#include <sys/ioctl.h>
Damien Miller99bd21e2006-03-15 11:11:28 +110069
Damien Millerc7b06362006-03-15 11:53:45 +110070#include <ctype.h>
Damien Miller6645e7a2006-03-15 14:42:54 +110071#ifdef HAVE_PATHS_H
Damien Miller03e20032006-03-15 11:16:59 +110072#include <paths.h>
Damien Miller6645e7a2006-03-15 14:42:54 +110073#endif
Damien Miller6ff3cad2006-03-15 11:52:09 +110074#include <signal.h>
Damien Miller99bd21e2006-03-15 11:11:28 +110075#include <termios.h>
Damien Millerd4a8b7e1999-10-27 13:42:43 +100076
Damien Millerd4a8b7e1999-10-27 13:42:43 +100077#include "ssh.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000078#include "ssh1.h"
79#include "ssh2.h"
80#include "xmalloc.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100081#include "packet.h"
82#include "buffer.h"
Damien Millerb38eff82000-04-01 11:09:21 +100083#include "compat.h"
Ben Lindstromc7637672001-06-09 00:36:26 +000084#include "channels.h"
Damien Millerb38eff82000-04-01 11:09:21 +100085#include "dispatch.h"
Damien Millerad833b32000-08-23 10:46:23 +100086#include "buffer.h"
87#include "bufaux.h"
Damien Miller0bc1bd82000-11-13 22:57:25 +110088#include "key.h"
Ben Lindstromf28f6342001-04-04 02:03:04 +000089#include "kex.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000090#include "log.h"
91#include "readconf.h"
Ben Lindstrombf555ba2001-01-18 02:04:35 +000092#include "clientloop.h"
Damien Milleraeb31d62005-12-13 19:29:36 +110093#include "sshconnect.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000094#include "authfd.h"
95#include "atomicio.h"
Darren Tucker06f2bd82004-05-13 16:06:46 +100096#include "sshpty.h"
Ben Lindstrom302ea6f2001-04-16 02:01:25 +000097#include "misc.h"
Damien Miller0e220db2004-06-15 10:34:08 +100098#include "monitor_fdpass.h"
99#include "match.h"
100#include "msg.h"
Damien Miller69b69aa2000-10-28 14:19:58 +1100101
102/* import options */
103extern Options options;
104
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000105/* Flag indicating that stdin should be redirected from /dev/null. */
106extern int stdin_null_flag;
107
Damien Millerd6965512003-12-17 16:31:53 +1100108/* Flag indicating that no shell has been requested */
109extern int no_shell_flag;
110
Damien Miller0e220db2004-06-15 10:34:08 +1000111/* Control socket */
112extern int control_fd;
113
Damien Miller5428f641999-11-25 11:54:57 +1100114/*
115 * Name of the host we are connecting to. This is the name given on the
116 * command line, or the HostName specified for the user-supplied name in a
117 * configuration file.
118 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000119extern char *host;
120
Damien Miller5428f641999-11-25 11:54:57 +1100121/*
122 * Flag to indicate that we have received a window change signal which has
123 * not yet been processed. This will cause a message indicating the new
124 * window size to be sent to the server a little later. This is volatile
125 * because this is updated in a signal handler.
126 */
Ben Lindstrom5e71c542001-12-06 16:48:14 +0000127static volatile sig_atomic_t received_window_change_signal = 0;
128static volatile sig_atomic_t received_signal = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000129
Damien Miller788f2122005-11-05 15:14:59 +1100130/* Flag indicating whether the user's terminal is in non-blocking mode. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000131static int in_non_blocking_mode = 0;
132
133/* Common data for the client loop code. */
Damien Miller97c91f62006-04-23 12:08:37 +1000134static volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */
Damien Millerad833b32000-08-23 10:46:23 +1000135static int escape_char; /* Escape character. */
Damien Miller95def091999-11-25 00:26:21 +1100136static int escape_pending; /* Last character was the escape character */
137static int last_was_cr; /* Last character was a newline. */
138static int exit_status; /* Used to store the exit status of the command. */
139static int stdin_eof; /* EOF has been encountered on standard error. */
140static Buffer stdin_buffer; /* Buffer for stdin data. */
141static Buffer stdout_buffer; /* Buffer for stdout data. */
142static Buffer stderr_buffer; /* Buffer for stderr data. */
Ben Lindstrom46c16222000-12-22 01:43:59 +0000143static u_long stdin_bytes, stdout_bytes, stderr_bytes;
144static u_int buffer_high;/* Soft max buffer size. */
Damien Miller95def091999-11-25 00:26:21 +1100145static int connection_in; /* Connection to server (input). */
146static int connection_out; /* Connection to server (output). */
Ben Lindstrombe2cc432001-04-04 23:46:07 +0000147static int need_rekeying; /* Set to non-zero if rekeying is requested. */
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +0000148static int session_closed = 0; /* In SSH2: login session closed. */
Damien Miller509b0102003-12-17 16:33:10 +1100149static int server_alive_timeouts = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000150
Ben Lindstrombba81212001-06-25 05:01:22 +0000151static void client_init_dispatch(void);
Damien Miller1383bd82000-04-06 12:32:37 +1000152int session_ident = -1;
153
Damien Miller0e220db2004-06-15 10:34:08 +1000154struct confirm_ctx {
155 int want_tty;
156 int want_subsys;
Damien Miller13390022005-07-06 09:44:19 +1000157 int want_x_fwd;
158 int want_agent_fwd;
Damien Miller0e220db2004-06-15 10:34:08 +1000159 Buffer cmd;
160 char *term;
161 struct termios tio;
Damien Miller3756dce2004-06-18 01:17:29 +1000162 char **env;
Damien Miller0e220db2004-06-15 10:34:08 +1000163};
164
Ben Lindstromf28f6342001-04-04 02:03:04 +0000165/*XXX*/
166extern Kex *xxx_kex;
167
Damien Miller0e220db2004-06-15 10:34:08 +1000168void ssh_process_session2_setup(int, int, int, Buffer *);
169
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000170/* Restores stdin to blocking mode. */
171
Ben Lindstrombba81212001-06-25 05:01:22 +0000172static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000173leave_non_blocking(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000174{
Damien Miller95def091999-11-25 00:26:21 +1100175 if (in_non_blocking_mode) {
Damien Miller03e66f62004-06-15 15:47:51 +1000176 unset_nonblock(fileno(stdin));
Damien Miller95def091999-11-25 00:26:21 +1100177 in_non_blocking_mode = 0;
Damien Miller95def091999-11-25 00:26:21 +1100178 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000179}
180
Damien Miller95def091999-11-25 00:26:21 +1100181/* Puts stdin terminal in non-blocking mode. */
182
Ben Lindstrombba81212001-06-25 05:01:22 +0000183static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000184enter_non_blocking(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000185{
Damien Miller95def091999-11-25 00:26:21 +1100186 in_non_blocking_mode = 1;
Damien Miller232711f2004-06-15 10:35:30 +1000187 set_nonblock(fileno(stdin));
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000188}
189
Damien Miller5428f641999-11-25 11:54:57 +1100190/*
191 * Signal handler for the window change signal (SIGWINCH). This just sets a
192 * flag indicating that the window has changed.
193 */
Damien Millerf0b15df2006-03-26 13:59:20 +1100194/*ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +0000195static void
Damien Miller95def091999-11-25 00:26:21 +1100196window_change_handler(int sig)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000197{
Damien Miller95def091999-11-25 00:26:21 +1100198 received_window_change_signal = 1;
199 signal(SIGWINCH, window_change_handler);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000200}
201
Damien Miller5428f641999-11-25 11:54:57 +1100202/*
203 * Signal handler for signals that cause the program to terminate. These
204 * signals must be trapped to restore terminal modes.
205 */
Damien Millerf0b15df2006-03-26 13:59:20 +1100206/*ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +0000207static void
Damien Miller95def091999-11-25 00:26:21 +1100208signal_handler(int sig)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000209{
Ben Lindstromec46e0b2001-06-09 01:27:31 +0000210 received_signal = sig;
211 quit_pending = 1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000212}
213
Damien Miller5428f641999-11-25 11:54:57 +1100214/*
215 * Returns current time in seconds from Jan 1, 1970 with the maximum
216 * available resolution.
217 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000218
Ben Lindstrombba81212001-06-25 05:01:22 +0000219static double
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000220get_current_time(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000221{
Damien Miller95def091999-11-25 00:26:21 +1100222 struct timeval tv;
223 gettimeofday(&tv, NULL);
224 return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000225}
226
Damien Miller17e7ed02005-06-17 12:54:33 +1000227#define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
228void
229client_x11_get_proto(const char *display, const char *xauth_path,
230 u_int trusted, char **_proto, char **_data)
231{
232 char cmd[1024];
233 char line[512];
234 char xdisplay[512];
235 static char proto[512], data[512];
236 FILE *f;
237 int got_data = 0, generated = 0, do_unlink = 0, i;
238 char *xauthdir, *xauthfile;
239 struct stat st;
240
241 xauthdir = xauthfile = NULL;
242 *_proto = proto;
243 *_data = data;
244 proto[0] = data[0] = '\0';
245
246 if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
247 debug("No xauth program.");
248 } else {
249 if (display == NULL) {
250 debug("x11_get_proto: DISPLAY not set");
251 return;
252 }
253 /*
254 * Handle FamilyLocal case where $DISPLAY does
255 * not match an authorization entry. For this we
256 * just try "xauth list unix:displaynum.screennum".
257 * XXX: "localhost" match to determine FamilyLocal
258 * is not perfect.
259 */
260 if (strncmp(display, "localhost:", 10) == 0) {
261 snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
262 display + 10);
263 display = xdisplay;
264 }
265 if (trusted == 0) {
266 xauthdir = xmalloc(MAXPATHLEN);
267 xauthfile = xmalloc(MAXPATHLEN);
268 strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
269 if (mkdtemp(xauthdir) != NULL) {
270 do_unlink = 1;
271 snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
272 xauthdir);
273 snprintf(cmd, sizeof(cmd),
274 "%s -f %s generate %s " SSH_X11_PROTO
275 " untrusted timeout 1200 2>" _PATH_DEVNULL,
276 xauth_path, xauthfile, display);
277 debug2("x11_get_proto: %s", cmd);
278 if (system(cmd) == 0)
279 generated = 1;
280 }
281 }
282 snprintf(cmd, sizeof(cmd),
Darren Tuckerd89dbf22005-10-03 18:05:26 +1000283 "%s %s%s list %s 2>" _PATH_DEVNULL,
Damien Miller17e7ed02005-06-17 12:54:33 +1000284 xauth_path,
285 generated ? "-f " : "" ,
286 generated ? xauthfile : "",
287 display);
288 debug2("x11_get_proto: %s", cmd);
289 f = popen(cmd, "r");
290 if (f && fgets(line, sizeof(line), f) &&
291 sscanf(line, "%*s %511s %511s", proto, data) == 2)
292 got_data = 1;
293 if (f)
294 pclose(f);
295 }
296
297 if (do_unlink) {
298 unlink(xauthfile);
299 rmdir(xauthdir);
300 }
301 if (xauthdir)
302 xfree(xauthdir);
303 if (xauthfile)
304 xfree(xauthfile);
305
306 /*
307 * If we didn't get authentication data, just make up some
308 * data. The forwarding code will check the validity of the
309 * response anyway, and substitute this data. The X11
310 * server, however, will ignore this fake data and use
311 * whatever authentication mechanisms it was using otherwise
312 * for the local connection.
313 */
314 if (!got_data) {
315 u_int32_t rnd = 0;
316
317 logit("Warning: No xauth data; "
318 "using fake authentication data for X11 forwarding.");
319 strlcpy(proto, SSH_X11_PROTO, sizeof proto);
320 for (i = 0; i < 16; i++) {
321 if (i % 4 == 0)
322 rnd = arc4random();
323 snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
324 rnd & 0xff);
325 rnd >>= 8;
326 }
327 }
328}
329
Damien Miller5428f641999-11-25 11:54:57 +1100330/*
331 * This is called when the interactive is entered. This checks if there is
332 * an EOF coming on stdin. We must check this explicitly, as select() does
333 * not appear to wake up when redirecting from /dev/null.
334 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000335
Ben Lindstrombba81212001-06-25 05:01:22 +0000336static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000337client_check_initial_eof_on_stdin(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000338{
Damien Miller95def091999-11-25 00:26:21 +1100339 int len;
340 char buf[1];
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000341
Damien Miller5428f641999-11-25 11:54:57 +1100342 /*
343 * If standard input is to be "redirected from /dev/null", we simply
344 * mark that we have seen an EOF and send an EOF message to the
345 * server. Otherwise, we try to read a single character; it appears
346 * that for some files, such /dev/null, select() never wakes up for
347 * read for this descriptor, which means that we never get EOF. This
348 * way we will get the EOF if stdin comes from /dev/null or similar.
349 */
Damien Miller95def091999-11-25 00:26:21 +1100350 if (stdin_null_flag) {
351 /* Fake EOF on stdin. */
352 debug("Sending eof.");
353 stdin_eof = 1;
354 packet_start(SSH_CMSG_EOF);
355 packet_send();
356 } else {
Damien Miller95def091999-11-25 00:26:21 +1100357 enter_non_blocking();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000358
Damien Miller95def091999-11-25 00:26:21 +1100359 /* Check for immediate EOF on stdin. */
360 len = read(fileno(stdin), buf, 1);
361 if (len == 0) {
Damien Miller5428f641999-11-25 11:54:57 +1100362 /* EOF. Record that we have seen it and send EOF to server. */
Damien Miller95def091999-11-25 00:26:21 +1100363 debug("Sending eof.");
364 stdin_eof = 1;
365 packet_start(SSH_CMSG_EOF);
366 packet_send();
367 } else if (len > 0) {
Damien Miller5428f641999-11-25 11:54:57 +1100368 /*
369 * Got data. We must store the data in the buffer,
370 * and also process it as an escape character if
371 * appropriate.
372 */
Ben Lindstrom46c16222000-12-22 01:43:59 +0000373 if ((u_char) buf[0] == escape_char)
Damien Miller95def091999-11-25 00:26:21 +1100374 escape_pending = 1;
Ben Lindstrome9613cf2001-03-05 06:14:02 +0000375 else
Damien Miller95def091999-11-25 00:26:21 +1100376 buffer_append(&stdin_buffer, buf, 1);
Damien Miller95def091999-11-25 00:26:21 +1100377 }
Damien Miller95def091999-11-25 00:26:21 +1100378 leave_non_blocking();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000379 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000380}
381
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000382
Damien Miller5428f641999-11-25 11:54:57 +1100383/*
384 * Make packets from buffered stdin data, and buffer them for sending to the
385 * connection.
386 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000387
Ben Lindstrombba81212001-06-25 05:01:22 +0000388static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000389client_make_packets_from_stdin_data(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000390{
Ben Lindstrom46c16222000-12-22 01:43:59 +0000391 u_int len;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000392
Damien Miller95def091999-11-25 00:26:21 +1100393 /* Send buffered stdin data to the server. */
394 while (buffer_len(&stdin_buffer) > 0 &&
Damien Miller9f0f5c62001-12-21 14:45:46 +1100395 packet_not_very_much_data_to_write()) {
Damien Miller95def091999-11-25 00:26:21 +1100396 len = buffer_len(&stdin_buffer);
397 /* Keep the packets at reasonable size. */
398 if (len > packet_get_maxsize())
399 len = packet_get_maxsize();
400 packet_start(SSH_CMSG_STDIN_DATA);
401 packet_put_string(buffer_ptr(&stdin_buffer), len);
402 packet_send();
403 buffer_consume(&stdin_buffer, len);
Ben Lindstrome9613cf2001-03-05 06:14:02 +0000404 stdin_bytes += len;
Damien Miller95def091999-11-25 00:26:21 +1100405 /* If we have a pending EOF, send it now. */
406 if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
407 packet_start(SSH_CMSG_EOF);
408 packet_send();
409 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000410 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000411}
412
Damien Miller5428f641999-11-25 11:54:57 +1100413/*
414 * Checks if the client window has changed, and sends a packet about it to
415 * the server if so. The actual change is detected elsewhere (by a software
416 * interrupt on Unix); this just checks the flag and sends a message if
417 * appropriate.
418 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000419
Ben Lindstrombba81212001-06-25 05:01:22 +0000420static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000421client_check_window_change(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000422{
Damien Miller1383bd82000-04-06 12:32:37 +1000423 struct winsize ws;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000424
Damien Miller1383bd82000-04-06 12:32:37 +1000425 if (! received_window_change_signal)
426 return;
427 /** XXX race */
428 received_window_change_signal = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000429
Damien Millerd3444942000-09-30 14:20:03 +1100430 debug2("client_check_window_change: changed");
Damien Miller1383bd82000-04-06 12:32:37 +1000431
432 if (compat20) {
Damien Miller0e220db2004-06-15 10:34:08 +1000433 channel_send_window_changes();
Damien Miller1383bd82000-04-06 12:32:37 +1000434 } else {
Damien Miller0e220db2004-06-15 10:34:08 +1000435 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
436 return;
Damien Miller1383bd82000-04-06 12:32:37 +1000437 packet_start(SSH_CMSG_WINDOW_SIZE);
Damien Miller71a73672006-03-26 14:04:36 +1100438 packet_put_int((u_int)ws.ws_row);
439 packet_put_int((u_int)ws.ws_col);
440 packet_put_int((u_int)ws.ws_xpixel);
441 packet_put_int((u_int)ws.ws_ypixel);
Damien Miller1383bd82000-04-06 12:32:37 +1000442 packet_send();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000443 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000444}
445
Damien Miller509b0102003-12-17 16:33:10 +1100446static void
447client_global_request_reply(int type, u_int32_t seq, void *ctxt)
448{
449 server_alive_timeouts = 0;
450 client_global_request_reply_fwd(type, seq, ctxt);
451}
452
453static void
454server_alive_check(void)
455{
456 if (++server_alive_timeouts > options.server_alive_count_max)
457 packet_disconnect("Timeout, server not responding.");
458 packet_start(SSH2_MSG_GLOBAL_REQUEST);
459 packet_put_cstring("keepalive@openssh.com");
460 packet_put_char(1); /* boolean: want reply */
461 packet_send();
462}
463
Damien Miller5428f641999-11-25 11:54:57 +1100464/*
465 * Waits until the client can do something (some data becomes available on
466 * one of the file descriptors).
467 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000468static void
Damien Miller5e953212001-01-30 09:14:00 +1100469client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000470 int *maxfdp, u_int *nallocp, int rekeying)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000471{
Damien Miller509b0102003-12-17 16:33:10 +1100472 struct timeval tv, *tvp;
473 int ret;
474
Damien Miller5e953212001-01-30 09:14:00 +1100475 /* Add any selections by the channel mechanism. */
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000476 channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000477
Damien Miller1383bd82000-04-06 12:32:37 +1000478 if (!compat20) {
479 /* Read from the connection, unless our buffers are full. */
480 if (buffer_len(&stdout_buffer) < buffer_high &&
481 buffer_len(&stderr_buffer) < buffer_high &&
482 channel_not_very_much_buffered_data())
Damien Miller5e953212001-01-30 09:14:00 +1100483 FD_SET(connection_in, *readsetp);
Damien Miller1383bd82000-04-06 12:32:37 +1000484 /*
485 * Read from stdin, unless we have seen EOF or have very much
486 * buffered data to send to the server.
487 */
488 if (!stdin_eof && packet_not_very_much_data_to_write())
Damien Miller5e953212001-01-30 09:14:00 +1100489 FD_SET(fileno(stdin), *readsetp);
Damien Miller1383bd82000-04-06 12:32:37 +1000490
491 /* Select stdout/stderr if have data in buffer. */
492 if (buffer_len(&stdout_buffer) > 0)
Damien Miller5e953212001-01-30 09:14:00 +1100493 FD_SET(fileno(stdout), *writesetp);
Damien Miller1383bd82000-04-06 12:32:37 +1000494 if (buffer_len(&stderr_buffer) > 0)
Damien Miller5e953212001-01-30 09:14:00 +1100495 FD_SET(fileno(stderr), *writesetp);
Damien Miller1383bd82000-04-06 12:32:37 +1000496 } else {
Ben Lindstromc8b3f472001-05-17 03:19:40 +0000497 /* channel_prepare_select could have closed the last channel */
Damien Miller164a7f42001-10-12 11:36:09 +1000498 if (session_closed && !channel_still_open() &&
499 !packet_have_data_to_write()) {
500 /* clear mask since we did not call select() */
Damien Miller79faeff2001-11-12 11:06:32 +1100501 memset(*readsetp, 0, *nallocp);
502 memset(*writesetp, 0, *nallocp);
Damien Miller164a7f42001-10-12 11:36:09 +1000503 return;
Ben Lindstromc8b3f472001-05-17 03:19:40 +0000504 } else {
505 FD_SET(connection_in, *readsetp);
506 }
Damien Miller1383bd82000-04-06 12:32:37 +1000507 }
508
Damien Miller95def091999-11-25 00:26:21 +1100509 /* Select server connection if have data to write to the server. */
510 if (packet_have_data_to_write())
Damien Miller5e953212001-01-30 09:14:00 +1100511 FD_SET(connection_out, *writesetp);
Damien Miller95def091999-11-25 00:26:21 +1100512
Damien Miller0e220db2004-06-15 10:34:08 +1000513 if (control_fd != -1)
514 FD_SET(control_fd, *readsetp);
515
Damien Miller5428f641999-11-25 11:54:57 +1100516 /*
517 * Wait for something to happen. This will suspend the process until
518 * some selected descriptor can be read, written, or has some other
Damien Miller509b0102003-12-17 16:33:10 +1100519 * event pending.
Damien Miller5428f641999-11-25 11:54:57 +1100520 */
Damien Miller95def091999-11-25 00:26:21 +1100521
Damien Miller509b0102003-12-17 16:33:10 +1100522 if (options.server_alive_interval == 0 || !compat20)
523 tvp = NULL;
Darren Tuckerfc959702004-07-17 16:12:08 +1000524 else {
Damien Miller509b0102003-12-17 16:33:10 +1100525 tv.tv_sec = options.server_alive_interval;
526 tv.tv_usec = 0;
527 tvp = &tv;
528 }
529 ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
530 if (ret < 0) {
Damien Miller95def091999-11-25 00:26:21 +1100531 char buf[100];
Ben Lindstromf9452512001-02-15 03:12:08 +0000532
533 /*
534 * We have to clear the select masks, because we return.
535 * We have to return, because the mainloop checks for the flags
536 * set by the signal handlers.
537 */
Damien Miller79faeff2001-11-12 11:06:32 +1100538 memset(*readsetp, 0, *nallocp);
539 memset(*writesetp, 0, *nallocp);
Ben Lindstromf9452512001-02-15 03:12:08 +0000540
Damien Miller95def091999-11-25 00:26:21 +1100541 if (errno == EINTR)
542 return;
543 /* Note: we might still have data in the buffers. */
544 snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
545 buffer_append(&stderr_buffer, buf, strlen(buf));
Damien Miller95def091999-11-25 00:26:21 +1100546 quit_pending = 1;
Damien Miller509b0102003-12-17 16:33:10 +1100547 } else if (ret == 0)
548 server_alive_check();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000549}
550
Ben Lindstrombba81212001-06-25 05:01:22 +0000551static void
Damien Millerad833b32000-08-23 10:46:23 +1000552client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000553{
Damien Miller95def091999-11-25 00:26:21 +1100554 /* Flush stdout and stderr buffers. */
Damien Millerad833b32000-08-23 10:46:23 +1000555 if (buffer_len(bout) > 0)
Darren Tucker9f63f222003-07-03 13:46:56 +1000556 atomicio(vwrite, fileno(stdout), buffer_ptr(bout), buffer_len(bout));
Damien Millerad833b32000-08-23 10:46:23 +1000557 if (buffer_len(berr) > 0)
Darren Tucker9f63f222003-07-03 13:46:56 +1000558 atomicio(vwrite, fileno(stderr), buffer_ptr(berr), buffer_len(berr));
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000559
Damien Miller95def091999-11-25 00:26:21 +1100560 leave_raw_mode();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000561
Damien Miller5428f641999-11-25 11:54:57 +1100562 /*
563 * Free (and clear) the buffer to reduce the amount of data that gets
564 * written to swap.
565 */
Damien Millerad833b32000-08-23 10:46:23 +1000566 buffer_free(bin);
567 buffer_free(bout);
568 buffer_free(berr);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000569
Damien Miller95def091999-11-25 00:26:21 +1100570 /* Send the suspend signal to the program itself. */
571 kill(getpid(), SIGTSTP);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000572
Darren Tucker5d78de62004-11-05 20:35:44 +1100573 /* Reset window sizes in case they have changed */
574 received_window_change_signal = 1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000575
Damien Miller95def091999-11-25 00:26:21 +1100576 /* OK, we have been continued by the user. Reinitialize buffers. */
Damien Millerad833b32000-08-23 10:46:23 +1000577 buffer_init(bin);
578 buffer_init(bout);
579 buffer_init(berr);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000580
Damien Miller95def091999-11-25 00:26:21 +1100581 enter_raw_mode();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000582}
583
Ben Lindstrombba81212001-06-25 05:01:22 +0000584static void
Damien Miller90fdfaf2006-03-26 14:25:37 +1100585client_process_net_input(fd_set *readset)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000586{
Damien Miller1383bd82000-04-06 12:32:37 +1000587 int len;
588 char buf[8192];
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000589
Damien Miller5428f641999-11-25 11:54:57 +1100590 /*
591 * Read input from the server, and add any such data to the buffer of
592 * the packet subsystem.
593 */
Damien Miller95def091999-11-25 00:26:21 +1100594 if (FD_ISSET(connection_in, readset)) {
595 /* Read as much as possible. */
596 len = read(connection_in, buf, sizeof(buf));
597 if (len == 0) {
598 /* Received EOF. The remote host has closed the connection. */
599 snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n",
600 host);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000601 buffer_append(&stderr_buffer, buf, strlen(buf));
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000602 quit_pending = 1;
603 return;
Damien Miller95def091999-11-25 00:26:21 +1100604 }
Damien Miller5428f641999-11-25 11:54:57 +1100605 /*
606 * There is a kernel bug on Solaris that causes select to
607 * sometimes wake up even though there is no data available.
608 */
Ben Lindstromebc88272001-03-06 03:34:40 +0000609 if (len < 0 && (errno == EAGAIN || errno == EINTR))
Damien Miller95def091999-11-25 00:26:21 +1100610 len = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000611
Damien Miller95def091999-11-25 00:26:21 +1100612 if (len < 0) {
613 /* An error has encountered. Perhaps there is a network problem. */
614 snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n",
615 host, strerror(errno));
616 buffer_append(&stderr_buffer, buf, strlen(buf));
Damien Miller95def091999-11-25 00:26:21 +1100617 quit_pending = 1;
618 return;
619 }
620 packet_process_incoming(buf, len);
621 }
Damien Miller1383bd82000-04-06 12:32:37 +1000622}
623
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000624static void
Damien Miller0e220db2004-06-15 10:34:08 +1000625client_subsystem_reply(int type, u_int32_t seq, void *ctxt)
626{
627 int id;
628 Channel *c;
Darren Tuckerfc959702004-07-17 16:12:08 +1000629
Damien Miller0e220db2004-06-15 10:34:08 +1000630 id = packet_get_int();
631 packet_check_eom();
632
633 if ((c = channel_lookup(id)) == NULL) {
634 error("%s: no channel for id %d", __func__, id);
635 return;
636 }
637
638 if (type == SSH2_MSG_CHANNEL_SUCCESS)
639 debug2("Request suceeded on channel %d", id);
640 else if (type == SSH2_MSG_CHANNEL_FAILURE) {
641 error("Request failed on channel %d", id);
642 channel_free(c);
643 }
644}
645
646static void
647client_extra_session2_setup(int id, void *arg)
648{
649 struct confirm_ctx *cctx = arg;
Damien Miller13390022005-07-06 09:44:19 +1000650 const char *display;
Damien Miller0e220db2004-06-15 10:34:08 +1000651 Channel *c;
Damien Miller3756dce2004-06-18 01:17:29 +1000652 int i;
Darren Tuckerfc959702004-07-17 16:12:08 +1000653
Damien Miller0e220db2004-06-15 10:34:08 +1000654 if (cctx == NULL)
655 fatal("%s: cctx == NULL", __func__);
656 if ((c = channel_lookup(id)) == NULL)
657 fatal("%s: no channel for id %d", __func__, id);
658
Damien Miller46d38de2005-07-17 17:02:09 +1000659 display = getenv("DISPLAY");
Damien Miller13390022005-07-06 09:44:19 +1000660 if (cctx->want_x_fwd && options.forward_x11 && display != NULL) {
661 char *proto, *data;
662 /* Get reasonable local authentication information. */
663 client_x11_get_proto(display, options.xauth_location,
664 options.forward_x11_trusted, &proto, &data);
665 /* Request forwarding with authentication spoofing. */
666 debug("Requesting X11 forwarding with authentication spoofing.");
667 x11_request_forwarding_with_spoofing(id, display, proto, data);
668 /* XXX wait for reply */
669 }
670
671 if (cctx->want_agent_fwd && options.forward_agent) {
672 debug("Requesting authentication agent forwarding.");
673 channel_request_start(id, "auth-agent-req@openssh.com", 0);
674 packet_send();
675 }
676
Darren Tuckerfc959702004-07-17 16:12:08 +1000677 client_session2_setup(id, cctx->want_tty, cctx->want_subsys,
Damien Miller3756dce2004-06-18 01:17:29 +1000678 cctx->term, &cctx->tio, c->rfd, &cctx->cmd, cctx->env,
Damien Miller0e220db2004-06-15 10:34:08 +1000679 client_subsystem_reply);
Damien Miller23f07702004-06-18 01:19:03 +1000680
Damien Miller0e220db2004-06-15 10:34:08 +1000681 c->confirm_ctx = NULL;
682 buffer_free(&cctx->cmd);
Damien Miller3756dce2004-06-18 01:17:29 +1000683 xfree(cctx->term);
684 if (cctx->env != NULL) {
685 for (i = 0; cctx->env[i] != NULL; i++)
686 xfree(cctx->env[i]);
687 xfree(cctx->env);
Darren Tuckerfc959702004-07-17 16:12:08 +1000688 }
Damien Miller3756dce2004-06-18 01:17:29 +1000689 xfree(cctx);
Damien Miller0e220db2004-06-15 10:34:08 +1000690}
691
692static void
Damien Miller90fdfaf2006-03-26 14:25:37 +1100693client_process_control(fd_set *readset)
Damien Miller0e220db2004-06-15 10:34:08 +1000694{
695 Buffer m;
696 Channel *c;
Damien Millereccb9de2005-06-17 12:59:34 +1000697 int client_fd, new_fd[3], ver, allowed;
Damien Miller0e220db2004-06-15 10:34:08 +1000698 socklen_t addrlen;
699 struct sockaddr_storage addr;
700 struct confirm_ctx *cctx;
701 char *cmd;
Damien Millereccb9de2005-06-17 12:59:34 +1000702 u_int i, len, env_len, command, flags;
Damien Miller0e220db2004-06-15 10:34:08 +1000703 uid_t euid;
704 gid_t egid;
705
706 /*
707 * Accept connection on control socket
708 */
709 if (control_fd == -1 || !FD_ISSET(control_fd, readset))
710 return;
711
712 memset(&addr, 0, sizeof(addr));
713 addrlen = sizeof(addr);
714 if ((client_fd = accept(control_fd,
715 (struct sockaddr*)&addr, &addrlen)) == -1) {
716 error("%s accept: %s", __func__, strerror(errno));
717 return;
718 }
719
720 if (getpeereid(client_fd, &euid, &egid) < 0) {
721 error("%s getpeereid failed: %s", __func__, strerror(errno));
722 close(client_fd);
723 return;
724 }
725 if ((euid != 0) && (getuid() != euid)) {
726 error("control mode uid mismatch: peer euid %u != uid %u",
727 (u_int) euid, (u_int) getuid());
728 close(client_fd);
729 return;
730 }
Damien Miller23f07702004-06-18 01:19:03 +1000731
Damien Miller0e220db2004-06-15 10:34:08 +1000732 unset_nonblock(client_fd);
733
Darren Tucker7ebfc102004-11-07 20:06:19 +1100734 /* Read command */
Damien Miller0e220db2004-06-15 10:34:08 +1000735 buffer_init(&m);
Darren Tucker7ebfc102004-11-07 20:06:19 +1100736 if (ssh_msg_recv(client_fd, &m) == -1) {
737 error("%s: client msg_recv failed", __func__);
738 close(client_fd);
739 buffer_free(&m);
740 return;
741 }
Damien Miller13390022005-07-06 09:44:19 +1000742 if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
Darren Tucker7ebfc102004-11-07 20:06:19 +1100743 error("%s: wrong client version %d", __func__, ver);
744 buffer_free(&m);
745 close(client_fd);
746 return;
747 }
Damien Miller0e220db2004-06-15 10:34:08 +1000748
Darren Tucker7ebfc102004-11-07 20:06:19 +1100749 allowed = 1;
750 command = buffer_get_int(&m);
751 flags = buffer_get_int(&m);
752
753 buffer_clear(&m);
754
755 switch (command) {
756 case SSHMUX_COMMAND_OPEN:
Damien Millerd14b1e72005-06-16 13:19:41 +1000757 if (options.control_master == SSHCTL_MASTER_ASK ||
758 options.control_master == SSHCTL_MASTER_AUTO_ASK)
Darren Tucker7ebfc102004-11-07 20:06:19 +1100759 allowed = ask_permission("Allow shared connection "
760 "to %s? ", host);
761 /* continue below */
762 break;
763 case SSHMUX_COMMAND_TERMINATE:
Damien Millerd14b1e72005-06-16 13:19:41 +1000764 if (options.control_master == SSHCTL_MASTER_ASK ||
765 options.control_master == SSHCTL_MASTER_AUTO_ASK)
Darren Tucker7ebfc102004-11-07 20:06:19 +1100766 allowed = ask_permission("Terminate shared connection "
767 "to %s? ", host);
768 if (allowed)
769 quit_pending = 1;
Darren Tucker47eede72005-03-14 23:08:12 +1100770 /* FALLTHROUGH */
Darren Tucker7ebfc102004-11-07 20:06:19 +1100771 case SSHMUX_COMMAND_ALIVE_CHECK:
772 /* Reply for SSHMUX_COMMAND_TERMINATE and ALIVE_CHECK */
773 buffer_clear(&m);
774 buffer_put_int(&m, allowed);
775 buffer_put_int(&m, getpid());
Damien Miller13390022005-07-06 09:44:19 +1000776 if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
Darren Tucker7ebfc102004-11-07 20:06:19 +1100777 error("%s: client msg_send failed", __func__);
778 close(client_fd);
779 buffer_free(&m);
780 return;
781 }
782 buffer_free(&m);
783 close(client_fd);
784 return;
785 default:
786 error("Unsupported command %d", command);
787 buffer_free(&m);
788 close(client_fd);
789 return;
790 }
791
792 /* Reply for SSHMUX_COMMAND_OPEN */
793 buffer_clear(&m);
Damien Miller23f07702004-06-18 01:19:03 +1000794 buffer_put_int(&m, allowed);
Damien Miller0e220db2004-06-15 10:34:08 +1000795 buffer_put_int(&m, getpid());
Damien Miller13390022005-07-06 09:44:19 +1000796 if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
Damien Miller0e220db2004-06-15 10:34:08 +1000797 error("%s: client msg_send failed", __func__);
798 close(client_fd);
Damien Miller23f07702004-06-18 01:19:03 +1000799 buffer_free(&m);
Damien Miller0e220db2004-06-15 10:34:08 +1000800 return;
801 }
Damien Miller0e220db2004-06-15 10:34:08 +1000802
Damien Miller23f07702004-06-18 01:19:03 +1000803 if (!allowed) {
804 error("Refused control connection");
805 close(client_fd);
806 buffer_free(&m);
807 return;
808 }
809
Darren Tucker7ebfc102004-11-07 20:06:19 +1100810 buffer_clear(&m);
Damien Miller0e220db2004-06-15 10:34:08 +1000811 if (ssh_msg_recv(client_fd, &m) == -1) {
812 error("%s: client msg_recv failed", __func__);
813 close(client_fd);
Damien Miller23f07702004-06-18 01:19:03 +1000814 buffer_free(&m);
Damien Miller0e220db2004-06-15 10:34:08 +1000815 return;
816 }
Damien Miller13390022005-07-06 09:44:19 +1000817 if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
Damien Miller0e220db2004-06-15 10:34:08 +1000818 error("%s: wrong client version %d", __func__, ver);
819 buffer_free(&m);
820 close(client_fd);
821 return;
822 }
823
Damien Miller07d86be2006-03-26 14:19:21 +1100824 cctx = xcalloc(1, sizeof(*cctx));
Darren Tucker7ebfc102004-11-07 20:06:19 +1100825 cctx->want_tty = (flags & SSHMUX_FLAG_TTY) != 0;
826 cctx->want_subsys = (flags & SSHMUX_FLAG_SUBSYS) != 0;
Damien Miller13390022005-07-06 09:44:19 +1000827 cctx->want_x_fwd = (flags & SSHMUX_FLAG_X11_FWD) != 0;
828 cctx->want_agent_fwd = (flags & SSHMUX_FLAG_AGENT_FWD) != 0;
Damien Miller0e220db2004-06-15 10:34:08 +1000829 cctx->term = buffer_get_string(&m, &len);
830
831 cmd = buffer_get_string(&m, &len);
832 buffer_init(&cctx->cmd);
833 buffer_append(&cctx->cmd, cmd, strlen(cmd));
834
Damien Miller3756dce2004-06-18 01:17:29 +1000835 env_len = buffer_get_int(&m);
836 env_len = MIN(env_len, 4096);
837 debug3("%s: receiving %d env vars", __func__, env_len);
838 if (env_len != 0) {
Damien Miller07d86be2006-03-26 14:19:21 +1100839 cctx->env = xcalloc(env_len + 1, sizeof(*cctx->env));
Damien Miller3756dce2004-06-18 01:17:29 +1000840 for (i = 0; i < env_len; i++)
841 cctx->env[i] = buffer_get_string(&m, &len);
842 cctx->env[i] = NULL;
843 }
844
Damien Miller0e220db2004-06-15 10:34:08 +1000845 debug2("%s: accepted tty %d, subsys %d, cmd %s", __func__,
846 cctx->want_tty, cctx->want_subsys, cmd);
Damien Miller24fd8dd2006-06-13 13:00:09 +1000847 xfree(cmd);
Damien Miller0e220db2004-06-15 10:34:08 +1000848
849 /* Gather fds from client */
850 new_fd[0] = mm_receive_fd(client_fd);
851 new_fd[1] = mm_receive_fd(client_fd);
852 new_fd[2] = mm_receive_fd(client_fd);
853
854 debug2("%s: got fds stdin %d, stdout %d, stderr %d", __func__,
855 new_fd[0], new_fd[1], new_fd[2]);
856
857 /* Try to pick up ttymodes from client before it goes raw */
858 if (cctx->want_tty && tcgetattr(new_fd[0], &cctx->tio) == -1)
859 error("%s: tcgetattr: %s", __func__, strerror(errno));
860
Darren Tucker7ebfc102004-11-07 20:06:19 +1100861 /* This roundtrip is just for synchronisation of ttymodes */
Damien Miller0e220db2004-06-15 10:34:08 +1000862 buffer_clear(&m);
Damien Miller13390022005-07-06 09:44:19 +1000863 if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
Damien Miller0e220db2004-06-15 10:34:08 +1000864 error("%s: client msg_send failed", __func__);
865 close(client_fd);
866 close(new_fd[0]);
867 close(new_fd[1]);
868 close(new_fd[2]);
Damien Miller23f07702004-06-18 01:19:03 +1000869 buffer_free(&m);
Darren Tucker7ebfc102004-11-07 20:06:19 +1100870 xfree(cctx->term);
871 if (env_len != 0) {
872 for (i = 0; i < env_len; i++)
873 xfree(cctx->env[i]);
874 xfree(cctx->env);
875 }
Damien Miller0e220db2004-06-15 10:34:08 +1000876 return;
877 }
878 buffer_free(&m);
879
880 /* enable nonblocking unless tty */
881 if (!isatty(new_fd[0]))
882 set_nonblock(new_fd[0]);
883 if (!isatty(new_fd[1]))
884 set_nonblock(new_fd[1]);
885 if (!isatty(new_fd[2]))
886 set_nonblock(new_fd[2]);
887
888 set_nonblock(client_fd);
889
Darren Tuckerfc959702004-07-17 16:12:08 +1000890 c = channel_new("session", SSH_CHANNEL_OPENING,
Damien Miller0e220db2004-06-15 10:34:08 +1000891 new_fd[0], new_fd[1], new_fd[2],
892 CHAN_SES_WINDOW_DEFAULT, CHAN_SES_PACKET_DEFAULT,
893 CHAN_EXTENDED_WRITE, "client-session", /*nonblock*/0);
894
895 /* XXX */
896 c->ctl_fd = client_fd;
897
898 debug3("%s: channel_new: %d", __func__, c->self);
899
900 channel_send_open(c->self);
901 channel_register_confirm(c->self, client_extra_session2_setup, cctx);
902}
903
904static void
Ben Lindstrom681d9322002-03-22 03:53:00 +0000905process_cmdline(void)
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000906{
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000907 void (*handler)(int);
Damien Millerf91ee4c2005-03-01 21:24:33 +1100908 char *s, *cmd, *cancel_host;
Darren Tuckere7066df2004-05-24 10:18:05 +1000909 int delete = 0;
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000910 int local = 0;
Damien Millerf91ee4c2005-03-01 21:24:33 +1100911 u_short cancel_port;
912 Forward fwd;
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000913
914 leave_raw_mode();
Ben Lindstrom5a6abda2002-06-09 19:41:48 +0000915 handler = signal(SIGINT, SIG_IGN);
Ben Lindstrom681d9322002-03-22 03:53:00 +0000916 cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000917 if (s == NULL)
918 goto out;
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000919 while (*s && isspace(*s))
920 s++;
Darren Tuckere7066df2004-05-24 10:18:05 +1000921 if (*s == '-')
922 s++; /* Skip cmdline '-', if any */
Darren Tuckere1675822004-05-24 10:13:07 +1000923 if (*s == '\0')
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000924 goto out;
Darren Tuckere7066df2004-05-24 10:18:05 +1000925
Darren Tucker1973c882004-05-24 10:34:36 +1000926 if (*s == 'h' || *s == 'H' || *s == '?') {
Darren Tuckere7066df2004-05-24 10:18:05 +1000927 logit("Commands:");
Damien Miller43020952006-07-10 20:16:12 +1000928 logit(" -L[bind_address:]port:host:hostport "
929 "Request local forward");
930 logit(" -R[bind_address:]port:host:hostport "
931 "Request remote forward");
Damien Miller57e8ad32006-07-10 20:20:52 +1000932 logit(" -KR[bind_address:]port "
Damien Miller43020952006-07-10 20:16:12 +1000933 "Cancel remote forward");
Damien Millerd27b9472005-12-13 19:29:02 +1100934 if (!options.permit_local_command)
935 goto out;
Damien Miller43020952006-07-10 20:16:12 +1000936 logit(" !args "
937 "Execute local command");
Damien Millerd27b9472005-12-13 19:29:02 +1100938 goto out;
939 }
940
941 if (*s == '!' && options.permit_local_command) {
942 s++;
943 ssh_local_cmd(s);
Darren Tuckere7066df2004-05-24 10:18:05 +1000944 goto out;
945 }
946
947 if (*s == 'K') {
948 delete = 1;
949 s++;
950 }
951 if (*s != 'L' && *s != 'R') {
Damien Miller996acd22003-04-09 20:59:48 +1000952 logit("Invalid command.");
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000953 goto out;
954 }
Darren Tuckere7066df2004-05-24 10:18:05 +1000955 if (*s == 'L')
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000956 local = 1;
Darren Tuckere7066df2004-05-24 10:18:05 +1000957 if (local && delete) {
958 logit("Not supported.");
959 goto out;
960 }
961 if ((!local || delete) && !compat20) {
Damien Miller996acd22003-04-09 20:59:48 +1000962 logit("Not supported for SSH protocol version 1.");
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000963 goto out;
964 }
Darren Tuckere7066df2004-05-24 10:18:05 +1000965
966 s++;
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000967 while (*s && isspace(*s))
968 s++;
969
Darren Tuckere7066df2004-05-24 10:18:05 +1000970 if (delete) {
Damien Millerf91ee4c2005-03-01 21:24:33 +1100971 cancel_port = 0;
972 cancel_host = hpdelim(&s); /* may be NULL */
973 if (s != NULL) {
974 cancel_port = a2port(s);
975 cancel_host = cleanhostname(cancel_host);
976 } else {
977 cancel_port = a2port(cancel_host);
978 cancel_host = NULL;
979 }
980 if (cancel_port == 0) {
981 logit("Bad forwarding close port");
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000982 goto out;
983 }
Damien Millerf91ee4c2005-03-01 21:24:33 +1100984 channel_request_rforward_cancel(cancel_host, cancel_port);
Darren Tuckere7066df2004-05-24 10:18:05 +1000985 } else {
Damien Millerf91ee4c2005-03-01 21:24:33 +1100986 if (!parse_forward(&fwd, s)) {
Darren Tuckere7066df2004-05-24 10:18:05 +1000987 logit("Bad forwarding specification.");
988 goto out;
989 }
Darren Tuckere7066df2004-05-24 10:18:05 +1000990 if (local) {
Damien Millerf91ee4c2005-03-01 21:24:33 +1100991 if (channel_setup_local_fwd_listener(fwd.listen_host,
992 fwd.listen_port, fwd.connect_host,
993 fwd.connect_port, options.gateway_ports) < 0) {
Darren Tuckere7066df2004-05-24 10:18:05 +1000994 logit("Port forwarding failed.");
995 goto out;
996 }
Damien Millerf91ee4c2005-03-01 21:24:33 +1100997 } else {
998 channel_request_remote_forwarding(fwd.listen_host,
999 fwd.listen_port, fwd.connect_host,
1000 fwd.connect_port);
1001 }
1002
Darren Tuckere7066df2004-05-24 10:18:05 +10001003 logit("Forwarding port.");
1004 }
1005
Ben Lindstrom5589f4b2002-03-22 03:24:32 +00001006out:
1007 signal(SIGINT, handler);
1008 enter_raw_mode();
1009 if (cmd)
1010 xfree(cmd);
1011}
1012
Damien Millerad833b32000-08-23 10:46:23 +10001013/* process the characters one by one */
Ben Lindstrombba81212001-06-25 05:01:22 +00001014static int
Damien Millerad833b32000-08-23 10:46:23 +10001015process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
1016{
1017 char string[1024];
1018 pid_t pid;
1019 int bytes = 0;
Ben Lindstrom46c16222000-12-22 01:43:59 +00001020 u_int i;
1021 u_char ch;
Damien Millerad833b32000-08-23 10:46:23 +10001022 char *s;
1023
Damien Millereccb9de2005-06-17 12:59:34 +10001024 if (len <= 0)
1025 return (0);
1026
1027 for (i = 0; i < (u_int)len; i++) {
Damien Millerad833b32000-08-23 10:46:23 +10001028 /* Get one character at a time. */
1029 ch = buf[i];
1030
1031 if (escape_pending) {
1032 /* We have previously seen an escape character. */
1033 /* Clear the flag now. */
1034 escape_pending = 0;
1035
1036 /* Process the escaped character. */
1037 switch (ch) {
1038 case '.':
1039 /* Terminate the connection. */
1040 snprintf(string, sizeof string, "%c.\r\n", escape_char);
1041 buffer_append(berr, string, strlen(string));
Damien Millerad833b32000-08-23 10:46:23 +10001042
1043 quit_pending = 1;
1044 return -1;
1045
1046 case 'Z' - 64:
1047 /* Suspend the program. */
1048 /* Print a message to that effect to the user. */
1049 snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char);
1050 buffer_append(berr, string, strlen(string));
Damien Millerad833b32000-08-23 10:46:23 +10001051
1052 /* Restore terminal modes and suspend. */
1053 client_suspend_self(bin, bout, berr);
1054
1055 /* We have been continued. */
1056 continue;
1057
Damien Miller54c45982003-05-15 10:20:13 +10001058 case 'B':
1059 if (compat20) {
1060 snprintf(string, sizeof string,
1061 "%cB\r\n", escape_char);
1062 buffer_append(berr, string,
1063 strlen(string));
1064 channel_request_start(session_ident,
1065 "break", 0);
1066 packet_put_int(1000);
1067 packet_send();
1068 }
1069 continue;
1070
Ben Lindstromf28f6342001-04-04 02:03:04 +00001071 case 'R':
Ben Lindstrom11bd8992001-04-05 23:34:29 +00001072 if (compat20) {
1073 if (datafellows & SSH_BUG_NOREKEY)
Damien Miller996acd22003-04-09 20:59:48 +10001074 logit("Server does not support re-keying");
Ben Lindstrom11bd8992001-04-05 23:34:29 +00001075 else
1076 need_rekeying = 1;
1077 }
Ben Lindstromf28f6342001-04-04 02:03:04 +00001078 continue;
1079
Damien Millerad833b32000-08-23 10:46:23 +10001080 case '&':
Damien Millerad833b32000-08-23 10:46:23 +10001081 /*
1082 * Detach the program (continue to serve connections,
1083 * but put in background and no more new connections).
1084 */
Damien Miller96507ef2001-11-12 10:52:25 +11001085 /* Restore tty modes. */
1086 leave_raw_mode();
1087
1088 /* Stop listening for new connections. */
1089 channel_stop_listening();
1090
1091 snprintf(string, sizeof string,
1092 "%c& [backgrounded]\n", escape_char);
1093 buffer_append(berr, string, strlen(string));
1094
1095 /* Fork into background. */
1096 pid = fork();
1097 if (pid < 0) {
1098 error("fork: %.100s", strerror(errno));
1099 continue;
1100 }
1101 if (pid != 0) { /* This is the parent. */
1102 /* The parent just exits. */
1103 exit(0);
1104 }
1105 /* The child continues serving connections. */
1106 if (compat20) {
1107 buffer_append(bin, "\004", 1);
1108 /* fake EOF on stdin */
1109 return -1;
1110 } else if (!stdin_eof) {
Damien Millerad833b32000-08-23 10:46:23 +10001111 /*
1112 * Sending SSH_CMSG_EOF alone does not always appear
1113 * to be enough. So we try to send an EOF character
1114 * first.
1115 */
1116 packet_start(SSH_CMSG_STDIN_DATA);
1117 packet_put_string("\004", 1);
1118 packet_send();
1119 /* Close stdin. */
1120 stdin_eof = 1;
1121 if (buffer_len(bin) == 0) {
1122 packet_start(SSH_CMSG_EOF);
1123 packet_send();
1124 }
1125 }
Damien Miller96507ef2001-11-12 10:52:25 +11001126 continue;
Damien Millerad833b32000-08-23 10:46:23 +10001127
1128 case '?':
1129 snprintf(string, sizeof string,
1130"%c?\r\n\
1131Supported escape sequences:\r\n\
Damien Miller06692862002-09-04 16:32:10 +10001132%c. - terminate connection\r\n\
Damien Miller54c45982003-05-15 10:20:13 +10001133%cB - send a BREAK to the remote system\r\n\
Damien Miller06692862002-09-04 16:32:10 +10001134%cC - open a command line\r\n\
1135%cR - Request rekey (SSH protocol 2 only)\r\n\
1136%c^Z - suspend ssh\r\n\
1137%c# - list forwarded connections\r\n\
1138%c& - background ssh (when waiting for connections to terminate)\r\n\
1139%c? - this message\r\n\
1140%c%c - send the escape character by typing it twice\r\n\
Damien Millerad833b32000-08-23 10:46:23 +10001141(Note that escapes are only recognized immediately after newline.)\r\n",
Damien Miller06692862002-09-04 16:32:10 +10001142 escape_char, escape_char, escape_char, escape_char,
1143 escape_char, escape_char, escape_char, escape_char,
Damien Miller54c45982003-05-15 10:20:13 +10001144 escape_char, escape_char, escape_char);
Damien Millerad833b32000-08-23 10:46:23 +10001145 buffer_append(berr, string, strlen(string));
1146 continue;
1147
1148 case '#':
1149 snprintf(string, sizeof string, "%c#\r\n", escape_char);
1150 buffer_append(berr, string, strlen(string));
1151 s = channel_open_message();
1152 buffer_append(berr, s, strlen(s));
1153 xfree(s);
1154 continue;
1155
Ben Lindstrom5589f4b2002-03-22 03:24:32 +00001156 case 'C':
Ben Lindstrom681d9322002-03-22 03:53:00 +00001157 process_cmdline();
Ben Lindstrom5589f4b2002-03-22 03:24:32 +00001158 continue;
1159
Damien Millerad833b32000-08-23 10:46:23 +10001160 default:
1161 if (ch != escape_char) {
1162 buffer_put_char(bin, escape_char);
1163 bytes++;
1164 }
1165 /* Escaped characters fall through here */
1166 break;
1167 }
1168 } else {
1169 /*
1170 * The previous character was not an escape char. Check if this
1171 * is an escape.
1172 */
1173 if (last_was_cr && ch == escape_char) {
1174 /* It is. Set the flag and continue to next character. */
1175 escape_pending = 1;
1176 continue;
1177 }
1178 }
1179
1180 /*
1181 * Normal character. Record whether it was a newline,
1182 * and append it to the buffer.
1183 */
1184 last_was_cr = (ch == '\r' || ch == '\n');
1185 buffer_put_char(bin, ch);
1186 bytes++;
1187 }
1188 return bytes;
1189}
1190
Ben Lindstrombba81212001-06-25 05:01:22 +00001191static void
Damien Miller90fdfaf2006-03-26 14:25:37 +11001192client_process_input(fd_set *readset)
Damien Miller1383bd82000-04-06 12:32:37 +10001193{
Damien Miller166fca82000-04-20 07:42:21 +10001194 int len;
Damien Millerad833b32000-08-23 10:46:23 +10001195 char buf[8192];
Damien Miller1383bd82000-04-06 12:32:37 +10001196
Damien Miller95def091999-11-25 00:26:21 +11001197 /* Read input from stdin. */
1198 if (FD_ISSET(fileno(stdin), readset)) {
1199 /* Read as much as possible. */
1200 len = read(fileno(stdin), buf, sizeof(buf));
Ben Lindstrom4c8cff12001-04-17 18:09:42 +00001201 if (len < 0 && (errno == EAGAIN || errno == EINTR))
1202 return; /* we'll try again later */
Damien Miller95def091999-11-25 00:26:21 +11001203 if (len <= 0) {
Damien Miller5428f641999-11-25 11:54:57 +11001204 /*
1205 * Received EOF or error. They are treated
1206 * similarly, except that an error message is printed
1207 * if it was an error condition.
1208 */
Damien Miller95def091999-11-25 00:26:21 +11001209 if (len < 0) {
1210 snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno));
1211 buffer_append(&stderr_buffer, buf, strlen(buf));
Damien Miller95def091999-11-25 00:26:21 +11001212 }
1213 /* Mark that we have seen EOF. */
1214 stdin_eof = 1;
Damien Miller5428f641999-11-25 11:54:57 +11001215 /*
1216 * Send an EOF message to the server unless there is
1217 * data in the buffer. If there is data in the
1218 * buffer, no message will be sent now. Code
1219 * elsewhere will send the EOF when the buffer
1220 * becomes empty if stdin_eof is set.
1221 */
Damien Miller95def091999-11-25 00:26:21 +11001222 if (buffer_len(&stdin_buffer) == 0) {
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001223 packet_start(SSH_CMSG_EOF);
1224 packet_send();
Damien Miller95def091999-11-25 00:26:21 +11001225 }
Ben Lindstrom2b1f71b2001-06-05 20:32:21 +00001226 } else if (escape_char == SSH_ESCAPECHAR_NONE) {
Damien Miller5428f641999-11-25 11:54:57 +11001227 /*
1228 * Normal successful read, and no escape character.
1229 * Just append the data to buffer.
1230 */
Damien Miller95def091999-11-25 00:26:21 +11001231 buffer_append(&stdin_buffer, buf, len);
Damien Miller95def091999-11-25 00:26:21 +11001232 } else {
Damien Miller5428f641999-11-25 11:54:57 +11001233 /*
1234 * Normal, successful read. But we have an escape character
1235 * and have to process the characters one by one.
1236 */
Ben Lindstrome9613cf2001-03-05 06:14:02 +00001237 if (process_escapes(&stdin_buffer, &stdout_buffer,
1238 &stderr_buffer, buf, len) == -1)
Damien Millerad833b32000-08-23 10:46:23 +10001239 return;
Damien Miller95def091999-11-25 00:26:21 +11001240 }
1241 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001242}
1243
Ben Lindstrombba81212001-06-25 05:01:22 +00001244static void
Damien Miller90fdfaf2006-03-26 14:25:37 +11001245client_process_output(fd_set *writeset)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001246{
Damien Miller95def091999-11-25 00:26:21 +11001247 int len;
1248 char buf[100];
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001249
Damien Miller95def091999-11-25 00:26:21 +11001250 /* Write buffered output to stdout. */
1251 if (FD_ISSET(fileno(stdout), writeset)) {
1252 /* Write as much data as possible. */
1253 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
Damien Miller037a0dc1999-12-07 15:38:31 +11001254 buffer_len(&stdout_buffer));
Damien Miller95def091999-11-25 00:26:21 +11001255 if (len <= 0) {
Ben Lindstrom4c8cff12001-04-17 18:09:42 +00001256 if (errno == EINTR || errno == EAGAIN)
Damien Miller95def091999-11-25 00:26:21 +11001257 len = 0;
1258 else {
Damien Miller5428f641999-11-25 11:54:57 +11001259 /*
1260 * An error or EOF was encountered. Put an
1261 * error message to stderr buffer.
1262 */
Damien Miller95def091999-11-25 00:26:21 +11001263 snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno));
1264 buffer_append(&stderr_buffer, buf, strlen(buf));
Damien Miller95def091999-11-25 00:26:21 +11001265 quit_pending = 1;
1266 return;
1267 }
1268 }
1269 /* Consume printed data from the buffer. */
1270 buffer_consume(&stdout_buffer, len);
Ben Lindstroma3700052001-04-05 23:26:32 +00001271 stdout_bytes += len;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001272 }
Damien Miller95def091999-11-25 00:26:21 +11001273 /* Write buffered output to stderr. */
1274 if (FD_ISSET(fileno(stderr), writeset)) {
1275 /* Write as much data as possible. */
1276 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
Damien Miller037a0dc1999-12-07 15:38:31 +11001277 buffer_len(&stderr_buffer));
Damien Miller95def091999-11-25 00:26:21 +11001278 if (len <= 0) {
Ben Lindstrom4c8cff12001-04-17 18:09:42 +00001279 if (errno == EINTR || errno == EAGAIN)
Damien Miller95def091999-11-25 00:26:21 +11001280 len = 0;
1281 else {
Damien Miller5428f641999-11-25 11:54:57 +11001282 /* EOF or error, but can't even print error message. */
Damien Miller95def091999-11-25 00:26:21 +11001283 quit_pending = 1;
1284 return;
1285 }
1286 }
1287 /* Consume printed characters from the buffer. */
1288 buffer_consume(&stderr_buffer, len);
Ben Lindstroma3700052001-04-05 23:26:32 +00001289 stderr_bytes += len;
Damien Miller95def091999-11-25 00:26:21 +11001290 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001291}
1292
Damien Miller5428f641999-11-25 11:54:57 +11001293/*
Damien Millerb38eff82000-04-01 11:09:21 +10001294 * Get packets from the connection input buffer, and process them as long as
1295 * there are packets available.
1296 *
1297 * Any unknown packets received during the actual
1298 * session cause the session to terminate. This is
1299 * intended to make debugging easier since no
1300 * confirmations are sent. Any compatible protocol
1301 * extensions must be negotiated during the
1302 * preparatory phase.
1303 */
1304
Ben Lindstrombba81212001-06-25 05:01:22 +00001305static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00001306client_process_buffered_input_packets(void)
Damien Millerb38eff82000-04-01 11:09:21 +10001307{
Ben Lindstromf28f6342001-04-04 02:03:04 +00001308 dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL);
Damien Millerb38eff82000-04-01 11:09:21 +10001309}
1310
Damien Millerad833b32000-08-23 10:46:23 +10001311/* scan buf[] for '~' before sending data to the peer */
1312
Ben Lindstrombba81212001-06-25 05:01:22 +00001313static int
Damien Millerad833b32000-08-23 10:46:23 +10001314simple_escape_filter(Channel *c, char *buf, int len)
1315{
1316 /* XXX we assume c->extended is writeable */
1317 return process_escapes(&c->input, &c->output, &c->extended, buf, len);
1318}
1319
Ben Lindstrombba81212001-06-25 05:01:22 +00001320static void
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001321client_channel_closed(int id, void *arg)
1322{
Damien Miller3ec27592001-10-12 11:35:04 +10001323 channel_cancel_cleanup(id);
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001324 session_closed = 1;
Darren Tucker9a2c4cd2003-09-22 21:16:05 +10001325 leave_raw_mode();
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001326}
1327
Damien Millerb38eff82000-04-01 11:09:21 +10001328/*
Damien Miller5428f641999-11-25 11:54:57 +11001329 * Implements the interactive session with the server. This is called after
1330 * the user has been authenticated, and a command has been started on the
Ben Lindstrom2b1f71b2001-06-05 20:32:21 +00001331 * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1332 * used as an escape character for terminating or suspending the session.
Damien Miller5428f641999-11-25 11:54:57 +11001333 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001334
Damien Miller4af51302000-04-16 11:18:38 +10001335int
Damien Millerad833b32000-08-23 10:46:23 +10001336client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001337{
Damien Miller5e953212001-01-30 09:14:00 +11001338 fd_set *readset = NULL, *writeset = NULL;
Damien Miller95def091999-11-25 00:26:21 +11001339 double start_time, total_time;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10001340 int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1341 u_int nalloc = 0;
Damien Miller95def091999-11-25 00:26:21 +11001342 char buf[100];
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001343
Damien Miller95def091999-11-25 00:26:21 +11001344 debug("Entering interactive session.");
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001345
Damien Miller95def091999-11-25 00:26:21 +11001346 start_time = get_current_time();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001347
Damien Miller95def091999-11-25 00:26:21 +11001348 /* Initialize variables. */
1349 escape_pending = 0;
1350 last_was_cr = 1;
1351 exit_status = -1;
1352 stdin_eof = 0;
1353 buffer_high = 64 * 1024;
1354 connection_in = packet_get_connection_in();
1355 connection_out = packet_get_connection_out();
Damien Miller5e953212001-01-30 09:14:00 +11001356 max_fd = MAX(connection_in, connection_out);
Damien Miller0e220db2004-06-15 10:34:08 +10001357 if (control_fd != -1)
1358 max_fd = MAX(max_fd, control_fd);
Damien Miller5e953212001-01-30 09:14:00 +11001359
1360 if (!compat20) {
Ben Lindstrom302ea6f2001-04-16 02:01:25 +00001361 /* enable nonblocking unless tty */
1362 if (!isatty(fileno(stdin)))
1363 set_nonblock(fileno(stdin));
1364 if (!isatty(fileno(stdout)))
1365 set_nonblock(fileno(stdout));
1366 if (!isatty(fileno(stderr)))
1367 set_nonblock(fileno(stderr));
Damien Miller5e953212001-01-30 09:14:00 +11001368 max_fd = MAX(max_fd, fileno(stdin));
1369 max_fd = MAX(max_fd, fileno(stdout));
1370 max_fd = MAX(max_fd, fileno(stderr));
1371 }
Damien Miller95def091999-11-25 00:26:21 +11001372 stdin_bytes = 0;
1373 stdout_bytes = 0;
1374 stderr_bytes = 0;
1375 quit_pending = 0;
1376 escape_char = escape_char_arg;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001377
Damien Miller95def091999-11-25 00:26:21 +11001378 /* Initialize buffers. */
1379 buffer_init(&stdin_buffer);
1380 buffer_init(&stdout_buffer);
1381 buffer_init(&stderr_buffer);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001382
Damien Millerb38eff82000-04-01 11:09:21 +10001383 client_init_dispatch();
1384
Ben Lindstromf49dbff2002-12-23 02:01:55 +00001385 /*
1386 * Set signal handlers, (e.g. to restore non-blocking mode)
1387 * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1388 */
Darren Tucker07336da2004-11-05 20:02:16 +11001389 if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1390 signal(SIGHUP, signal_handler);
Ben Lindstromf49dbff2002-12-23 02:01:55 +00001391 if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1392 signal(SIGINT, signal_handler);
1393 if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1394 signal(SIGQUIT, signal_handler);
1395 if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1396 signal(SIGTERM, signal_handler);
Darren Tucker5d78de62004-11-05 20:35:44 +11001397 signal(SIGWINCH, window_change_handler);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001398
Damien Miller95def091999-11-25 00:26:21 +11001399 if (have_pty)
1400 enter_raw_mode();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001401
Ben Lindstrom5b828322001-02-09 01:34:36 +00001402 if (compat20) {
1403 session_ident = ssh2_chan_id;
Ben Lindstrom2b1f71b2001-06-05 20:32:21 +00001404 if (escape_char != SSH_ESCAPECHAR_NONE)
Ben Lindstrom5b828322001-02-09 01:34:36 +00001405 channel_register_filter(session_ident,
Damien Miller077b2382005-12-31 16:22:32 +11001406 simple_escape_filter, NULL);
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001407 if (session_ident != -1)
1408 channel_register_cleanup(session_ident,
Damien Miller39eda6e2005-11-05 14:52:50 +11001409 client_channel_closed, 0);
Ben Lindstrom5b828322001-02-09 01:34:36 +00001410 } else {
1411 /* Check if we should immediately send eof on stdin. */
Damien Miller1383bd82000-04-06 12:32:37 +10001412 client_check_initial_eof_on_stdin();
Ben Lindstrom5b828322001-02-09 01:34:36 +00001413 }
Damien Millerad833b32000-08-23 10:46:23 +10001414
Damien Miller95def091999-11-25 00:26:21 +11001415 /* Main loop of the client for the interactive session mode. */
1416 while (!quit_pending) {
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001417
Damien Miller5428f641999-11-25 11:54:57 +11001418 /* Process buffered packets sent by the server. */
Damien Miller95def091999-11-25 00:26:21 +11001419 client_process_buffered_input_packets();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001420
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001421 if (compat20 && session_closed && !channel_still_open())
Damien Miller1383bd82000-04-06 12:32:37 +10001422 break;
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001423
1424 rekeying = (xxx_kex != NULL && !xxx_kex->done);
Damien Miller1383bd82000-04-06 12:32:37 +10001425
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001426 if (rekeying) {
1427 debug("rekeying in progress");
1428 } else {
1429 /*
1430 * Make packets of buffered stdin data, and buffer
1431 * them for sending to the server.
1432 */
1433 if (!compat20)
1434 client_make_packets_from_stdin_data();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001435
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001436 /*
1437 * Make packets from buffered channel data, and
1438 * enqueue them for sending to the server.
1439 */
1440 if (packet_not_very_much_data_to_write())
1441 channel_output_poll();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001442
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001443 /*
1444 * Check if the window size has changed, and buffer a
1445 * message about it to the server if so.
1446 */
1447 client_check_window_change();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001448
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001449 if (quit_pending)
1450 break;
1451 }
Damien Miller5428f641999-11-25 11:54:57 +11001452 /*
1453 * Wait until we have something to do (something becomes
1454 * available on one of the descriptors).
1455 */
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001456 max_fd2 = max_fd;
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001457 client_wait_until_can_do_something(&readset, &writeset,
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001458 &max_fd2, &nalloc, rekeying);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001459
Damien Miller95def091999-11-25 00:26:21 +11001460 if (quit_pending)
1461 break;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001462
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001463 /* Do channel operations unless rekeying in progress. */
1464 if (!rekeying) {
1465 channel_after_select(readset, writeset);
Damien Millera5539d22003-04-09 20:50:06 +10001466 if (need_rekeying || packet_need_rekeying()) {
1467 debug("need rekeying");
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001468 xxx_kex->done = 0;
1469 kex_send_kexinit(xxx_kex);
1470 need_rekeying = 0;
1471 }
1472 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001473
Damien Miller1383bd82000-04-06 12:32:37 +10001474 /* Buffer input from the connection. */
Damien Miller5e953212001-01-30 09:14:00 +11001475 client_process_net_input(readset);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001476
Damien Miller0e220db2004-06-15 10:34:08 +10001477 /* Accept control connections. */
1478 client_process_control(readset);
1479
Damien Miller1383bd82000-04-06 12:32:37 +10001480 if (quit_pending)
1481 break;
1482
1483 if (!compat20) {
1484 /* Buffer data from stdin */
Damien Miller5e953212001-01-30 09:14:00 +11001485 client_process_input(readset);
Damien Miller1383bd82000-04-06 12:32:37 +10001486 /*
1487 * Process output to stdout and stderr. Output to
1488 * the connection is processed elsewhere (above).
1489 */
Damien Miller5e953212001-01-30 09:14:00 +11001490 client_process_output(writeset);
Damien Miller1383bd82000-04-06 12:32:37 +10001491 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001492
Damien Miller5428f641999-11-25 11:54:57 +11001493 /* Send as much buffered packet data as possible to the sender. */
Damien Miller5e953212001-01-30 09:14:00 +11001494 if (FD_ISSET(connection_out, writeset))
Damien Miller95def091999-11-25 00:26:21 +11001495 packet_write_poll();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001496 }
Damien Miller5e953212001-01-30 09:14:00 +11001497 if (readset)
1498 xfree(readset);
1499 if (writeset)
1500 xfree(writeset);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001501
Damien Miller95def091999-11-25 00:26:21 +11001502 /* Terminate the session. */
1503
1504 /* Stop watching for window change. */
Darren Tucker5d78de62004-11-05 20:35:44 +11001505 signal(SIGWINCH, SIG_DFL);
Damien Miller95def091999-11-25 00:26:21 +11001506
Ben Lindstrom601e4362001-06-21 03:19:23 +00001507 channel_free_all();
Damien Miller95def091999-11-25 00:26:21 +11001508
Ben Lindstromec46e0b2001-06-09 01:27:31 +00001509 if (have_pty)
1510 leave_raw_mode();
Ben Lindstromc93e84c2001-05-12 00:08:37 +00001511
1512 /* restore blocking io */
1513 if (!isatty(fileno(stdin)))
1514 unset_nonblock(fileno(stdin));
1515 if (!isatty(fileno(stdout)))
1516 unset_nonblock(fileno(stdout));
1517 if (!isatty(fileno(stderr)))
1518 unset_nonblock(fileno(stderr));
1519
Damien Millerd6965512003-12-17 16:31:53 +11001520 /*
1521 * If there was no shell or command requested, there will be no remote
1522 * exit status to be returned. In that case, clear error code if the
1523 * connection was deliberately terminated at this end.
1524 */
1525 if (no_shell_flag && received_signal == SIGTERM) {
1526 received_signal = 0;
1527 exit_status = 0;
1528 }
1529
Darren Tucker9a2c4cd2003-09-22 21:16:05 +10001530 if (received_signal)
Ben Lindstromf8f065b2001-12-06 17:52:16 +00001531 fatal("Killed by signal %d.", (int) received_signal);
Ben Lindstromec46e0b2001-06-09 01:27:31 +00001532
1533 /*
1534 * In interactive mode (with pseudo tty) display a message indicating
1535 * that the connection has been closed.
1536 */
1537 if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1538 snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host);
1539 buffer_append(&stderr_buffer, buf, strlen(buf));
1540 }
1541
Damien Miller95def091999-11-25 00:26:21 +11001542 /* Output any buffered data for stdout. */
Ben Lindstromc93e84c2001-05-12 00:08:37 +00001543 while (buffer_len(&stdout_buffer) > 0) {
1544 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
Damien Miller037a0dc1999-12-07 15:38:31 +11001545 buffer_len(&stdout_buffer));
Ben Lindstromc93e84c2001-05-12 00:08:37 +00001546 if (len <= 0) {
Damien Miller95def091999-11-25 00:26:21 +11001547 error("Write failed flushing stdout buffer.");
Ben Lindstromc93e84c2001-05-12 00:08:37 +00001548 break;
1549 }
Damien Miller95def091999-11-25 00:26:21 +11001550 buffer_consume(&stdout_buffer, len);
Ben Lindstroma3700052001-04-05 23:26:32 +00001551 stdout_bytes += len;
Damien Miller95def091999-11-25 00:26:21 +11001552 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001553
Damien Miller95def091999-11-25 00:26:21 +11001554 /* Output any buffered data for stderr. */
Ben Lindstromc93e84c2001-05-12 00:08:37 +00001555 while (buffer_len(&stderr_buffer) > 0) {
1556 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
Damien Miller037a0dc1999-12-07 15:38:31 +11001557 buffer_len(&stderr_buffer));
Ben Lindstromc93e84c2001-05-12 00:08:37 +00001558 if (len <= 0) {
Damien Miller95def091999-11-25 00:26:21 +11001559 error("Write failed flushing stderr buffer.");
Ben Lindstromc93e84c2001-05-12 00:08:37 +00001560 break;
1561 }
Damien Miller95def091999-11-25 00:26:21 +11001562 buffer_consume(&stderr_buffer, len);
Ben Lindstroma3700052001-04-05 23:26:32 +00001563 stderr_bytes += len;
Damien Miller95def091999-11-25 00:26:21 +11001564 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001565
Damien Miller95def091999-11-25 00:26:21 +11001566 /* Clear and free any buffers. */
1567 memset(buf, 0, sizeof(buf));
1568 buffer_free(&stdin_buffer);
1569 buffer_free(&stdout_buffer);
1570 buffer_free(&stderr_buffer);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001571
Damien Miller95def091999-11-25 00:26:21 +11001572 /* Report bytes transferred, and transfer rates. */
1573 total_time = get_current_time() - start_time;
1574 debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds",
Damien Miller9f0f5c62001-12-21 14:45:46 +11001575 stdin_bytes, stdout_bytes, stderr_bytes, total_time);
Damien Miller95def091999-11-25 00:26:21 +11001576 if (total_time > 0)
1577 debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
Damien Miller9f0f5c62001-12-21 14:45:46 +11001578 stdin_bytes / total_time, stdout_bytes / total_time,
1579 stderr_bytes / total_time);
Damien Miller95def091999-11-25 00:26:21 +11001580
1581 /* Return the exit status of the program. */
1582 debug("Exit status %d", exit_status);
1583 return exit_status;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001584}
Damien Millerb38eff82000-04-01 11:09:21 +10001585
1586/*********/
1587
Ben Lindstrombba81212001-06-25 05:01:22 +00001588static void
Damien Miller630d6f42002-01-22 23:17:30 +11001589client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10001590{
Ben Lindstrom46c16222000-12-22 01:43:59 +00001591 u_int data_len;
Damien Millerb38eff82000-04-01 11:09:21 +10001592 char *data = packet_get_string(&data_len);
Damien Miller48b03fc2002-01-22 23:11:40 +11001593 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10001594 buffer_append(&stdout_buffer, data, data_len);
Damien Millerb38eff82000-04-01 11:09:21 +10001595 memset(data, 0, data_len);
1596 xfree(data);
1597}
Ben Lindstrombba81212001-06-25 05:01:22 +00001598static void
Damien Miller630d6f42002-01-22 23:17:30 +11001599client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10001600{
Ben Lindstrom46c16222000-12-22 01:43:59 +00001601 u_int data_len;
Damien Millerb38eff82000-04-01 11:09:21 +10001602 char *data = packet_get_string(&data_len);
Damien Miller48b03fc2002-01-22 23:11:40 +11001603 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10001604 buffer_append(&stderr_buffer, data, data_len);
Damien Millerb38eff82000-04-01 11:09:21 +10001605 memset(data, 0, data_len);
1606 xfree(data);
1607}
Ben Lindstrombba81212001-06-25 05:01:22 +00001608static void
Damien Miller630d6f42002-01-22 23:17:30 +11001609client_input_exit_status(int type, u_int32_t seq, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10001610{
Damien Millerb38eff82000-04-01 11:09:21 +10001611 exit_status = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11001612 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10001613 /* Acknowledge the exit. */
1614 packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1615 packet_send();
1616 /*
1617 * Must wait for packet to be sent since we are
1618 * exiting the loop.
1619 */
1620 packet_write_wait();
1621 /* Flag that we want to exit. */
1622 quit_pending = 1;
1623}
Darren Tucker5dcdd212003-10-02 16:17:00 +10001624static void
1625client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1626{
1627 Channel *c = NULL;
1628 int remote_id, sock;
1629
1630 /* Read the remote channel number from the message. */
1631 remote_id = packet_get_int();
1632 packet_check_eom();
1633
1634 /*
1635 * Get a connection to the local authentication agent (this may again
1636 * get forwarded).
1637 */
1638 sock = ssh_get_authentication_socket();
1639
1640 /*
1641 * If we could not connect the agent, send an error message back to
1642 * the server. This should never happen unless the agent dies,
1643 * because authentication forwarding is only enabled if we have an
1644 * agent.
1645 */
1646 if (sock >= 0) {
1647 c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1648 -1, 0, 0, 0, "authentication agent connection", 1);
1649 c->remote_id = remote_id;
1650 c->force_drain = 1;
1651 }
1652 if (c == NULL) {
1653 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1654 packet_put_int(remote_id);
1655 } else {
1656 /* Send a confirmation to the remote host. */
1657 debug("Forwarding authentication connection.");
1658 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1659 packet_put_int(remote_id);
1660 packet_put_int(c->self);
1661 }
1662 packet_send();
1663}
Damien Millerb38eff82000-04-01 11:09:21 +10001664
Ben Lindstrombba81212001-06-25 05:01:22 +00001665static Channel *
Damien Miller0bc1bd82000-11-13 22:57:25 +11001666client_request_forwarded_tcpip(const char *request_type, int rchan)
1667{
Ben Lindstroma962c2f2002-07-04 00:14:17 +00001668 Channel *c = NULL;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001669 char *listen_address, *originator_address;
1670 int listen_port, originator_port;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001671 int sock;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001672
1673 /* Get rest of the packet */
1674 listen_address = packet_get_string(NULL);
1675 listen_port = packet_get_int();
1676 originator_address = packet_get_string(NULL);
1677 originator_port = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11001678 packet_check_eom();
Damien Miller0bc1bd82000-11-13 22:57:25 +11001679
1680 debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d",
1681 listen_address, listen_port, originator_address, originator_port);
1682
Ben Lindstrom173e6462001-07-04 05:15:15 +00001683 sock = channel_connect_by_listen_address(listen_port);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001684 if (sock < 0) {
1685 xfree(originator_address);
1686 xfree(listen_address);
1687 return NULL;
1688 }
1689 c = channel_new("forwarded-tcpip",
1690 SSH_CHANNEL_CONNECTING, sock, sock, -1,
1691 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001692 originator_address, 1);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001693 xfree(originator_address);
1694 xfree(listen_address);
1695 return c;
1696}
1697
Ben Lindstroma962c2f2002-07-04 00:14:17 +00001698static Channel *
Damien Miller0bc1bd82000-11-13 22:57:25 +11001699client_request_x11(const char *request_type, int rchan)
1700{
1701 Channel *c = NULL;
1702 char *originator;
1703 int originator_port;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001704 int sock;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001705
1706 if (!options.forward_x11) {
1707 error("Warning: ssh server tried X11 forwarding.");
Damien Miller5eb137c2005-12-31 16:19:53 +11001708 error("Warning: this is probably a break-in attempt by a malicious server.");
Damien Miller0bc1bd82000-11-13 22:57:25 +11001709 return NULL;
1710 }
1711 originator = packet_get_string(NULL);
1712 if (datafellows & SSH_BUG_X11FWD) {
1713 debug2("buggy server: x11 request w/o originator_port");
1714 originator_port = 0;
1715 } else {
1716 originator_port = packet_get_int();
1717 }
Damien Miller48b03fc2002-01-22 23:11:40 +11001718 packet_check_eom();
Damien Miller0bc1bd82000-11-13 22:57:25 +11001719 /* XXX check permission */
Damien Millerd83ff352001-01-30 09:19:34 +11001720 debug("client_request_x11: request from %s %d", originator,
1721 originator_port);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001722 xfree(originator);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001723 sock = x11_connect_display();
1724 if (sock < 0)
1725 return NULL;
1726 c = channel_new("x11",
1727 SSH_CHANNEL_X11_OPEN, sock, sock, -1,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001728 CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
Ben Lindstrom944c4f02001-09-18 05:51:13 +00001729 c->force_drain = 1;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001730 return c;
1731}
1732
Ben Lindstroma962c2f2002-07-04 00:14:17 +00001733static Channel *
Damien Miller0bc1bd82000-11-13 22:57:25 +11001734client_request_agent(const char *request_type, int rchan)
1735{
1736 Channel *c = NULL;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001737 int sock;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001738
1739 if (!options.forward_agent) {
1740 error("Warning: ssh server tried agent forwarding.");
Damien Miller5eb137c2005-12-31 16:19:53 +11001741 error("Warning: this is probably a break-in attempt by a malicious server.");
Damien Miller0bc1bd82000-11-13 22:57:25 +11001742 return NULL;
1743 }
1744 sock = ssh_get_authentication_socket();
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001745 if (sock < 0)
1746 return NULL;
1747 c = channel_new("authentication agent connection",
1748 SSH_CHANNEL_OPEN, sock, sock, -1,
1749 CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001750 "authentication agent connection", 1);
Ben Lindstrom944c4f02001-09-18 05:51:13 +00001751 c->force_drain = 1;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001752 return c;
1753}
1754
Damien Millerbd483e72000-04-30 10:00:53 +10001755/* XXXX move to generic input handler */
Ben Lindstrombba81212001-06-25 05:01:22 +00001756static void
Damien Miller630d6f42002-01-22 23:17:30 +11001757client_input_channel_open(int type, u_int32_t seq, void *ctxt)
Damien Millerbd483e72000-04-30 10:00:53 +10001758{
1759 Channel *c = NULL;
1760 char *ctype;
Damien Millerbd483e72000-04-30 10:00:53 +10001761 int rchan;
Ben Lindstrom4fed2be2002-06-25 23:17:36 +00001762 u_int rmaxpack, rwindow, len;
Damien Millerbd483e72000-04-30 10:00:53 +10001763
1764 ctype = packet_get_string(&len);
1765 rchan = packet_get_int();
1766 rwindow = packet_get_int();
1767 rmaxpack = packet_get_int();
1768
Damien Millere247cc42000-05-07 12:03:14 +10001769 debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
Damien Millerbd483e72000-04-30 10:00:53 +10001770 ctype, rchan, rwindow, rmaxpack);
1771
Damien Miller0bc1bd82000-11-13 22:57:25 +11001772 if (strcmp(ctype, "forwarded-tcpip") == 0) {
1773 c = client_request_forwarded_tcpip(ctype, rchan);
1774 } else if (strcmp(ctype, "x11") == 0) {
1775 c = client_request_x11(ctype, rchan);
1776 } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1777 c = client_request_agent(ctype, rchan);
Damien Millerbd483e72000-04-30 10:00:53 +10001778 }
1779/* XXX duplicate : */
1780 if (c != NULL) {
1781 debug("confirm %s", ctype);
1782 c->remote_id = rchan;
1783 c->remote_window = rwindow;
1784 c->remote_maxpacket = rmaxpack;
Ben Lindstroma69d89b2001-05-09 00:01:18 +00001785 if (c->type != SSH_CHANNEL_CONNECTING) {
1786 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1787 packet_put_int(c->remote_id);
1788 packet_put_int(c->self);
1789 packet_put_int(c->local_window);
1790 packet_put_int(c->local_maxpacket);
1791 packet_send();
1792 }
Damien Millerbd483e72000-04-30 10:00:53 +10001793 } else {
1794 debug("failure %s", ctype);
1795 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1796 packet_put_int(rchan);
1797 packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
Ben Lindstromf3436742001-04-29 19:52:00 +00001798 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
Ben Lindstroma69d89b2001-05-09 00:01:18 +00001799 packet_put_cstring("open failed");
Ben Lindstromf3436742001-04-29 19:52:00 +00001800 packet_put_cstring("");
1801 }
Damien Millerbd483e72000-04-30 10:00:53 +10001802 packet_send();
1803 }
1804 xfree(ctype);
1805}
Ben Lindstrombba81212001-06-25 05:01:22 +00001806static void
Damien Miller630d6f42002-01-22 23:17:30 +11001807client_input_channel_req(int type, u_int32_t seq, void *ctxt)
Ben Lindstrom5b828322001-02-09 01:34:36 +00001808{
1809 Channel *c = NULL;
Damien Miller0e220db2004-06-15 10:34:08 +10001810 int exitval, id, reply, success = 0;
Ben Lindstrom5b828322001-02-09 01:34:36 +00001811 char *rtype;
1812
1813 id = packet_get_int();
1814 rtype = packet_get_string(NULL);
1815 reply = packet_get_char();
1816
1817 debug("client_input_channel_req: channel %d rtype %s reply %d",
1818 id, rtype, reply);
1819
Damien Miller3bbd8782004-06-18 22:23:22 +10001820 if (id == -1) {
1821 error("client_input_channel_req: request for channel -1");
1822 } else if ((c = channel_lookup(id)) == NULL) {
Ben Lindstrom5b828322001-02-09 01:34:36 +00001823 error("client_input_channel_req: channel %d: unknown channel", id);
1824 } else if (strcmp(rtype, "exit-status") == 0) {
Damien Miller0e220db2004-06-15 10:34:08 +10001825 exitval = packet_get_int();
1826 if (id == session_ident) {
1827 success = 1;
1828 exit_status = exitval;
1829 } else if (c->ctl_fd == -1) {
1830 error("client_input_channel_req: unexpected channel %d",
1831 session_ident);
1832 } else {
1833 atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1834 success = 1;
1835 }
Damien Miller48b03fc2002-01-22 23:11:40 +11001836 packet_check_eom();
Ben Lindstrom5b828322001-02-09 01:34:36 +00001837 }
1838 if (reply) {
1839 packet_start(success ?
1840 SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
Damien Miller3bbd8782004-06-18 22:23:22 +10001841 packet_put_int(id);
Ben Lindstrom5b828322001-02-09 01:34:36 +00001842 packet_send();
1843 }
1844 xfree(rtype);
1845}
Damien Millerc3fa4072002-01-22 23:21:58 +11001846static void
1847client_input_global_request(int type, u_int32_t seq, void *ctxt)
1848{
1849 char *rtype;
1850 int want_reply;
1851 int success = 0;
1852
1853 rtype = packet_get_string(NULL);
1854 want_reply = packet_get_char();
Damien Miller509b0102003-12-17 16:33:10 +11001855 debug("client_input_global_request: rtype %s want_reply %d",
1856 rtype, want_reply);
Damien Millerc3fa4072002-01-22 23:21:58 +11001857 if (want_reply) {
1858 packet_start(success ?
1859 SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1860 packet_send();
1861 packet_write_wait();
1862 }
1863 xfree(rtype);
1864}
Damien Millerbd483e72000-04-30 10:00:53 +10001865
Damien Miller0e220db2004-06-15 10:34:08 +10001866void
Darren Tuckerfc959702004-07-17 16:12:08 +10001867client_session2_setup(int id, int want_tty, int want_subsystem,
Damien Miller3756dce2004-06-18 01:17:29 +10001868 const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env,
Damien Miller0e220db2004-06-15 10:34:08 +10001869 dispatch_fn *subsys_repl)
1870{
1871 int len;
Darren Tucker5d78de62004-11-05 20:35:44 +11001872 Channel *c = NULL;
Damien Miller0e220db2004-06-15 10:34:08 +10001873
1874 debug2("%s: id %d", __func__, id);
1875
Darren Tucker5d78de62004-11-05 20:35:44 +11001876 if ((c = channel_lookup(id)) == NULL)
1877 fatal("client_session2_setup: channel %d: unknown channel", id);
1878
Damien Miller0e220db2004-06-15 10:34:08 +10001879 if (want_tty) {
1880 struct winsize ws;
1881 struct termios tio;
1882
1883 /* Store window size in the packet. */
1884 if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1885 memset(&ws, 0, sizeof(ws));
1886
1887 channel_request_start(id, "pty-req", 0);
1888 packet_put_cstring(term != NULL ? term : "");
Damien Miller71a73672006-03-26 14:04:36 +11001889 packet_put_int((u_int)ws.ws_col);
1890 packet_put_int((u_int)ws.ws_row);
1891 packet_put_int((u_int)ws.ws_xpixel);
1892 packet_put_int((u_int)ws.ws_ypixel);
Damien Miller0e220db2004-06-15 10:34:08 +10001893 tio = get_saved_tio();
1894 tty_make_modes(-1, tiop != NULL ? tiop : &tio);
1895 packet_send();
1896 /* XXX wait for reply */
Darren Tucker5d78de62004-11-05 20:35:44 +11001897 c->client_tty = 1;
Damien Miller0e220db2004-06-15 10:34:08 +10001898 }
1899
1900 /* Transfer any environment variables from client to server */
Damien Miller3756dce2004-06-18 01:17:29 +10001901 if (options.num_send_env != 0 && env != NULL) {
Damien Miller0e220db2004-06-15 10:34:08 +10001902 int i, j, matched;
Damien Miller0e220db2004-06-15 10:34:08 +10001903 char *name, *val;
1904
1905 debug("Sending environment.");
Damien Miller3756dce2004-06-18 01:17:29 +10001906 for (i = 0; env[i] != NULL; i++) {
Damien Miller0e220db2004-06-15 10:34:08 +10001907 /* Split */
Damien Miller3756dce2004-06-18 01:17:29 +10001908 name = xstrdup(env[i]);
Damien Miller0e220db2004-06-15 10:34:08 +10001909 if ((val = strchr(name, '=')) == NULL) {
Damien Miller0a0176e2005-11-05 15:07:59 +11001910 xfree(name);
Damien Miller0e220db2004-06-15 10:34:08 +10001911 continue;
1912 }
1913 *val++ = '\0';
1914
1915 matched = 0;
1916 for (j = 0; j < options.num_send_env; j++) {
1917 if (match_pattern(name, options.send_env[j])) {
1918 matched = 1;
1919 break;
1920 }
1921 }
1922 if (!matched) {
1923 debug3("Ignored env %s", name);
Damien Miller0a0176e2005-11-05 15:07:59 +11001924 xfree(name);
Damien Miller0e220db2004-06-15 10:34:08 +10001925 continue;
1926 }
1927
1928 debug("Sending env %s = %s", name, val);
1929 channel_request_start(id, "env", 0);
1930 packet_put_cstring(name);
1931 packet_put_cstring(val);
1932 packet_send();
Damien Miller0a0176e2005-11-05 15:07:59 +11001933 xfree(name);
Damien Miller0e220db2004-06-15 10:34:08 +10001934 }
1935 }
1936
1937 len = buffer_len(cmd);
1938 if (len > 0) {
1939 if (len > 900)
1940 len = 900;
1941 if (want_subsystem) {
1942 debug("Sending subsystem: %.*s", len, (u_char*)buffer_ptr(cmd));
1943 channel_request_start(id, "subsystem", subsys_repl != NULL);
1944 if (subsys_repl != NULL) {
1945 /* register callback for reply */
1946 /* XXX we assume that client_loop has already been called */
1947 dispatch_set(SSH2_MSG_CHANNEL_FAILURE, subsys_repl);
1948 dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, subsys_repl);
1949 }
1950 } else {
1951 debug("Sending command: %.*s", len, (u_char*)buffer_ptr(cmd));
1952 channel_request_start(id, "exec", 0);
1953 }
1954 packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
1955 packet_send();
1956 } else {
1957 channel_request_start(id, "shell", 0);
1958 packet_send();
1959 }
1960}
1961
Ben Lindstrombba81212001-06-25 05:01:22 +00001962static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00001963client_init_dispatch_20(void)
Damien Miller1383bd82000-04-06 12:32:37 +10001964{
Ben Lindstrom8ac91062001-04-04 17:57:54 +00001965 dispatch_init(&dispatch_protocol_error);
Damien Miller2797f7f2002-04-23 21:09:44 +10001966
Damien Miller1383bd82000-04-06 12:32:37 +10001967 dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1968 dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1969 dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1970 dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
Damien Millerbd483e72000-04-30 10:00:53 +10001971 dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
Damien Miller1383bd82000-04-06 12:32:37 +10001972 dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1973 dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
Ben Lindstrom5b828322001-02-09 01:34:36 +00001974 dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
Damien Miller1383bd82000-04-06 12:32:37 +10001975 dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
Damien Millerc3fa4072002-01-22 23:21:58 +11001976 dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
Ben Lindstrom8ac91062001-04-04 17:57:54 +00001977
1978 /* rekeying */
1979 dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
Damien Miller2797f7f2002-04-23 21:09:44 +10001980
1981 /* global request reply messages */
1982 dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
1983 dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
Damien Miller1383bd82000-04-06 12:32:37 +10001984}
Ben Lindstrombba81212001-06-25 05:01:22 +00001985static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00001986client_init_dispatch_13(void)
Damien Millerb38eff82000-04-01 11:09:21 +10001987{
1988 dispatch_init(NULL);
1989 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
1990 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
1991 dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
Damien Millerb38eff82000-04-01 11:09:21 +10001992 dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1993 dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1994 dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
Damien Millerb38eff82000-04-01 11:09:21 +10001995 dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
1996 dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
1997 dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
Damien Miller69b69aa2000-10-28 14:19:58 +11001998
1999 dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
Darren Tucker5dcdd212003-10-02 16:17:00 +10002000 &client_input_agent_open : &deny_input_open);
Damien Miller69b69aa2000-10-28 14:19:58 +11002001 dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
2002 &x11_input_open : &deny_input_open);
Damien Millerb38eff82000-04-01 11:09:21 +10002003}
Ben Lindstrombba81212001-06-25 05:01:22 +00002004static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00002005client_init_dispatch_15(void)
Damien Millerb38eff82000-04-01 11:09:21 +10002006{
2007 client_init_dispatch_13();
2008 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2009 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2010}
Ben Lindstromdb47f382001-07-04 05:10:27 +00002011static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00002012client_init_dispatch(void)
Damien Millerb38eff82000-04-01 11:09:21 +10002013{
Damien Miller1383bd82000-04-06 12:32:37 +10002014 if (compat20)
2015 client_init_dispatch_20();
2016 else if (compat13)
Damien Millerb38eff82000-04-01 11:09:21 +10002017 client_init_dispatch_13();
2018 else
2019 client_init_dispatch_15();
2020}
Darren Tucker9a2c4cd2003-09-22 21:16:05 +10002021
2022/* client specific fatal cleanup */
2023void
Darren Tucker3e33cec2003-10-02 16:12:36 +10002024cleanup_exit(int i)
Darren Tucker9a2c4cd2003-09-22 21:16:05 +10002025{
Darren Tucker9a2c4cd2003-09-22 21:16:05 +10002026 leave_raw_mode();
2027 leave_non_blocking();
Damien Miller0e220db2004-06-15 10:34:08 +10002028 if (options.control_path != NULL && control_fd != -1)
2029 unlink(options.control_path);
Darren Tucker3e33cec2003-10-02 16:12:36 +10002030 _exit(i);
Darren Tucker9a2c4cd2003-09-22 21:16:05 +10002031}