blob: dba3e96c328102265d34efb3092317eed8684ed5 [file] [log] [blame]
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001/*
Damien Miller95def091999-11-25 00:26:21 +11002 * Author: Tatu Ylonen <ylo@cs.hut.fi>
Damien Miller95def091999-11-25 00:26:21 +11003 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4 * All rights reserved
Damien Miller95def091999-11-25 00:26:21 +11005 * The main loop for the interactive session (client side).
Damien Miller4af51302000-04-16 11:18:38 +10006 *
Damien Millere4340be2000-09-16 13:29:08 +11007 * As far as I am concerned, the code I have written for this software
8 * can be used freely for any purpose. Any derived versions of this
9 * software must be clearly marked as such, and if the derived work is
10 * incompatible with the protocol description in the RFC file, it must be
11 * called by a name other than "ssh" or "Secure Shell".
12 *
13 *
14 * Copyright (c) 1999 Theo de Raadt. All rights reserved.
15 *
16 * Redistribution and use in source and binary forms, with or without
17 * modification, are permitted provided that the following conditions
18 * are met:
19 * 1. Redistributions of source code must retain the above copyright
20 * notice, this list of conditions and the following disclaimer.
21 * 2. Redistributions in binary form must reproduce the above copyright
22 * notice, this list of conditions and the following disclaimer in the
23 * documentation and/or other materials provided with the distribution.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
26 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
27 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
28 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
29 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
30 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
31 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
32 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
33 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
34 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35 *
36 *
Damien Miller1383bd82000-04-06 12:32:37 +100037 * SSH2 support added by Markus Friedl.
Ben Lindstrom44697232001-07-04 03:32:30 +000038 * Copyright (c) 1999, 2000, 2001 Markus Friedl. All rights reserved.
Damien Millere4340be2000-09-16 13:29:08 +110039 *
40 * Redistribution and use in source and binary forms, with or without
41 * modification, are permitted provided that the following conditions
42 * are met:
43 * 1. Redistributions of source code must retain the above copyright
44 * notice, this list of conditions and the following disclaimer.
45 * 2. Redistributions in binary form must reproduce the above copyright
46 * notice, this list of conditions and the following disclaimer in the
47 * documentation and/or other materials provided with the distribution.
48 *
49 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
50 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
51 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
52 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
53 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
54 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
55 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
56 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
57 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
58 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Damien Miller95def091999-11-25 00:26:21 +110059 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100060
61#include "includes.h"
Damien Millerc7b06362006-03-15 11:53:45 +110062RCSID("$OpenBSD: clientloop.c,v 1.155 2006/02/22 00:04:44 stevesk Exp $");
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 Miller03e20032006-03-15 11:16:59 +110071#include <paths.h>
Damien Miller6ff3cad2006-03-15 11:52:09 +110072#include <signal.h>
Damien Miller99bd21e2006-03-15 11:11:28 +110073#include <termios.h>
Damien Millerd4a8b7e1999-10-27 13:42:43 +100074
Damien Millerd4a8b7e1999-10-27 13:42:43 +100075#include "ssh.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000076#include "ssh1.h"
77#include "ssh2.h"
78#include "xmalloc.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100079#include "packet.h"
80#include "buffer.h"
Damien Millerb38eff82000-04-01 11:09:21 +100081#include "compat.h"
Ben Lindstromc7637672001-06-09 00:36:26 +000082#include "channels.h"
Damien Millerb38eff82000-04-01 11:09:21 +100083#include "dispatch.h"
Damien Millerad833b32000-08-23 10:46:23 +100084#include "buffer.h"
85#include "bufaux.h"
Damien Miller0bc1bd82000-11-13 22:57:25 +110086#include "key.h"
Ben Lindstromf28f6342001-04-04 02:03:04 +000087#include "kex.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000088#include "log.h"
89#include "readconf.h"
Ben Lindstrombf555ba2001-01-18 02:04:35 +000090#include "clientloop.h"
Damien Milleraeb31d62005-12-13 19:29:36 +110091#include "sshconnect.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000092#include "authfd.h"
93#include "atomicio.h"
Darren Tucker06f2bd82004-05-13 16:06:46 +100094#include "sshpty.h"
Ben Lindstrom302ea6f2001-04-16 02:01:25 +000095#include "misc.h"
Damien Miller0e220db2004-06-15 10:34:08 +100096#include "monitor_fdpass.h"
97#include "match.h"
98#include "msg.h"
Damien Miller69b69aa2000-10-28 14:19:58 +110099
100/* import options */
101extern Options options;
102
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000103/* Flag indicating that stdin should be redirected from /dev/null. */
104extern int stdin_null_flag;
105
Damien Millerd6965512003-12-17 16:31:53 +1100106/* Flag indicating that no shell has been requested */
107extern int no_shell_flag;
108
Damien Miller0e220db2004-06-15 10:34:08 +1000109/* Control socket */
110extern int control_fd;
111
Damien Miller5428f641999-11-25 11:54:57 +1100112/*
113 * Name of the host we are connecting to. This is the name given on the
114 * command line, or the HostName specified for the user-supplied name in a
115 * configuration file.
116 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000117extern char *host;
118
Damien Miller5428f641999-11-25 11:54:57 +1100119/*
120 * Flag to indicate that we have received a window change signal which has
121 * not yet been processed. This will cause a message indicating the new
122 * window size to be sent to the server a little later. This is volatile
123 * because this is updated in a signal handler.
124 */
Ben Lindstrom5e71c542001-12-06 16:48:14 +0000125static volatile sig_atomic_t received_window_change_signal = 0;
126static volatile sig_atomic_t received_signal = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000127
Damien Miller788f2122005-11-05 15:14:59 +1100128/* Flag indicating whether the user's terminal is in non-blocking mode. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000129static int in_non_blocking_mode = 0;
130
131/* Common data for the client loop code. */
Damien Millerad833b32000-08-23 10:46:23 +1000132static int quit_pending; /* Set to non-zero to quit the client loop. */
133static int escape_char; /* Escape character. */
Damien Miller95def091999-11-25 00:26:21 +1100134static int escape_pending; /* Last character was the escape character */
135static int last_was_cr; /* Last character was a newline. */
136static int exit_status; /* Used to store the exit status of the command. */
137static int stdin_eof; /* EOF has been encountered on standard error. */
138static Buffer stdin_buffer; /* Buffer for stdin data. */
139static Buffer stdout_buffer; /* Buffer for stdout data. */
140static Buffer stderr_buffer; /* Buffer for stderr data. */
Ben Lindstrom46c16222000-12-22 01:43:59 +0000141static u_long stdin_bytes, stdout_bytes, stderr_bytes;
142static u_int buffer_high;/* Soft max buffer size. */
Damien Miller95def091999-11-25 00:26:21 +1100143static int connection_in; /* Connection to server (input). */
144static int connection_out; /* Connection to server (output). */
Ben Lindstrombe2cc432001-04-04 23:46:07 +0000145static int need_rekeying; /* Set to non-zero if rekeying is requested. */
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +0000146static int session_closed = 0; /* In SSH2: login session closed. */
Damien Miller509b0102003-12-17 16:33:10 +1100147static int server_alive_timeouts = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000148
Ben Lindstrombba81212001-06-25 05:01:22 +0000149static void client_init_dispatch(void);
Damien Miller1383bd82000-04-06 12:32:37 +1000150int session_ident = -1;
151
Damien Miller0e220db2004-06-15 10:34:08 +1000152struct confirm_ctx {
153 int want_tty;
154 int want_subsys;
Damien Miller13390022005-07-06 09:44:19 +1000155 int want_x_fwd;
156 int want_agent_fwd;
Damien Miller0e220db2004-06-15 10:34:08 +1000157 Buffer cmd;
158 char *term;
159 struct termios tio;
Damien Miller3756dce2004-06-18 01:17:29 +1000160 char **env;
Damien Miller0e220db2004-06-15 10:34:08 +1000161};
162
Ben Lindstromf28f6342001-04-04 02:03:04 +0000163/*XXX*/
164extern Kex *xxx_kex;
165
Damien Miller0e220db2004-06-15 10:34:08 +1000166void ssh_process_session2_setup(int, int, int, Buffer *);
167
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000168/* Restores stdin to blocking mode. */
169
Ben Lindstrombba81212001-06-25 05:01:22 +0000170static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000171leave_non_blocking(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000172{
Damien Miller95def091999-11-25 00:26:21 +1100173 if (in_non_blocking_mode) {
Damien Miller03e66f62004-06-15 15:47:51 +1000174 unset_nonblock(fileno(stdin));
Damien Miller95def091999-11-25 00:26:21 +1100175 in_non_blocking_mode = 0;
Damien Miller95def091999-11-25 00:26:21 +1100176 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000177}
178
Damien Miller95def091999-11-25 00:26:21 +1100179/* Puts stdin terminal in non-blocking mode. */
180
Ben Lindstrombba81212001-06-25 05:01:22 +0000181static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000182enter_non_blocking(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000183{
Damien Miller95def091999-11-25 00:26:21 +1100184 in_non_blocking_mode = 1;
Damien Miller232711f2004-06-15 10:35:30 +1000185 set_nonblock(fileno(stdin));
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000186}
187
Damien Miller5428f641999-11-25 11:54:57 +1100188/*
189 * Signal handler for the window change signal (SIGWINCH). This just sets a
190 * flag indicating that the window has changed.
191 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000192
Ben Lindstrombba81212001-06-25 05:01:22 +0000193static void
Damien Miller95def091999-11-25 00:26:21 +1100194window_change_handler(int sig)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000195{
Damien Miller95def091999-11-25 00:26:21 +1100196 received_window_change_signal = 1;
197 signal(SIGWINCH, window_change_handler);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000198}
199
Damien Miller5428f641999-11-25 11:54:57 +1100200/*
201 * Signal handler for signals that cause the program to terminate. These
202 * signals must be trapped to restore terminal modes.
203 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000204
Ben Lindstrombba81212001-06-25 05:01:22 +0000205static void
Damien Miller95def091999-11-25 00:26:21 +1100206signal_handler(int sig)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000207{
Ben Lindstromec46e0b2001-06-09 01:27:31 +0000208 received_signal = sig;
209 quit_pending = 1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000210}
211
Damien Miller5428f641999-11-25 11:54:57 +1100212/*
213 * Returns current time in seconds from Jan 1, 1970 with the maximum
214 * available resolution.
215 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000216
Ben Lindstrombba81212001-06-25 05:01:22 +0000217static double
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000218get_current_time(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000219{
Damien Miller95def091999-11-25 00:26:21 +1100220 struct timeval tv;
221 gettimeofday(&tv, NULL);
222 return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000223}
224
Damien Miller17e7ed02005-06-17 12:54:33 +1000225#define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
226void
227client_x11_get_proto(const char *display, const char *xauth_path,
228 u_int trusted, char **_proto, char **_data)
229{
230 char cmd[1024];
231 char line[512];
232 char xdisplay[512];
233 static char proto[512], data[512];
234 FILE *f;
235 int got_data = 0, generated = 0, do_unlink = 0, i;
236 char *xauthdir, *xauthfile;
237 struct stat st;
238
239 xauthdir = xauthfile = NULL;
240 *_proto = proto;
241 *_data = data;
242 proto[0] = data[0] = '\0';
243
244 if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
245 debug("No xauth program.");
246 } else {
247 if (display == NULL) {
248 debug("x11_get_proto: DISPLAY not set");
249 return;
250 }
251 /*
252 * Handle FamilyLocal case where $DISPLAY does
253 * not match an authorization entry. For this we
254 * just try "xauth list unix:displaynum.screennum".
255 * XXX: "localhost" match to determine FamilyLocal
256 * is not perfect.
257 */
258 if (strncmp(display, "localhost:", 10) == 0) {
259 snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
260 display + 10);
261 display = xdisplay;
262 }
263 if (trusted == 0) {
264 xauthdir = xmalloc(MAXPATHLEN);
265 xauthfile = xmalloc(MAXPATHLEN);
266 strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
267 if (mkdtemp(xauthdir) != NULL) {
268 do_unlink = 1;
269 snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
270 xauthdir);
271 snprintf(cmd, sizeof(cmd),
272 "%s -f %s generate %s " SSH_X11_PROTO
273 " untrusted timeout 1200 2>" _PATH_DEVNULL,
274 xauth_path, xauthfile, display);
275 debug2("x11_get_proto: %s", cmd);
276 if (system(cmd) == 0)
277 generated = 1;
278 }
279 }
280 snprintf(cmd, sizeof(cmd),
Darren Tuckerd89dbf22005-10-03 18:05:26 +1000281 "%s %s%s list %s 2>" _PATH_DEVNULL,
Damien Miller17e7ed02005-06-17 12:54:33 +1000282 xauth_path,
283 generated ? "-f " : "" ,
284 generated ? xauthfile : "",
285 display);
286 debug2("x11_get_proto: %s", cmd);
287 f = popen(cmd, "r");
288 if (f && fgets(line, sizeof(line), f) &&
289 sscanf(line, "%*s %511s %511s", proto, data) == 2)
290 got_data = 1;
291 if (f)
292 pclose(f);
293 }
294
295 if (do_unlink) {
296 unlink(xauthfile);
297 rmdir(xauthdir);
298 }
299 if (xauthdir)
300 xfree(xauthdir);
301 if (xauthfile)
302 xfree(xauthfile);
303
304 /*
305 * If we didn't get authentication data, just make up some
306 * data. The forwarding code will check the validity of the
307 * response anyway, and substitute this data. The X11
308 * server, however, will ignore this fake data and use
309 * whatever authentication mechanisms it was using otherwise
310 * for the local connection.
311 */
312 if (!got_data) {
313 u_int32_t rnd = 0;
314
315 logit("Warning: No xauth data; "
316 "using fake authentication data for X11 forwarding.");
317 strlcpy(proto, SSH_X11_PROTO, sizeof proto);
318 for (i = 0; i < 16; i++) {
319 if (i % 4 == 0)
320 rnd = arc4random();
321 snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
322 rnd & 0xff);
323 rnd >>= 8;
324 }
325 }
326}
327
Damien Miller5428f641999-11-25 11:54:57 +1100328/*
329 * This is called when the interactive is entered. This checks if there is
330 * an EOF coming on stdin. We must check this explicitly, as select() does
331 * not appear to wake up when redirecting from /dev/null.
332 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000333
Ben Lindstrombba81212001-06-25 05:01:22 +0000334static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000335client_check_initial_eof_on_stdin(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000336{
Damien Miller95def091999-11-25 00:26:21 +1100337 int len;
338 char buf[1];
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000339
Damien Miller5428f641999-11-25 11:54:57 +1100340 /*
341 * If standard input is to be "redirected from /dev/null", we simply
342 * mark that we have seen an EOF and send an EOF message to the
343 * server. Otherwise, we try to read a single character; it appears
344 * that for some files, such /dev/null, select() never wakes up for
345 * read for this descriptor, which means that we never get EOF. This
346 * way we will get the EOF if stdin comes from /dev/null or similar.
347 */
Damien Miller95def091999-11-25 00:26:21 +1100348 if (stdin_null_flag) {
349 /* Fake EOF on stdin. */
350 debug("Sending eof.");
351 stdin_eof = 1;
352 packet_start(SSH_CMSG_EOF);
353 packet_send();
354 } else {
Damien Miller95def091999-11-25 00:26:21 +1100355 enter_non_blocking();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000356
Damien Miller95def091999-11-25 00:26:21 +1100357 /* Check for immediate EOF on stdin. */
358 len = read(fileno(stdin), buf, 1);
359 if (len == 0) {
Damien Miller5428f641999-11-25 11:54:57 +1100360 /* EOF. Record that we have seen it and send EOF to server. */
Damien Miller95def091999-11-25 00:26:21 +1100361 debug("Sending eof.");
362 stdin_eof = 1;
363 packet_start(SSH_CMSG_EOF);
364 packet_send();
365 } else if (len > 0) {
Damien Miller5428f641999-11-25 11:54:57 +1100366 /*
367 * Got data. We must store the data in the buffer,
368 * and also process it as an escape character if
369 * appropriate.
370 */
Ben Lindstrom46c16222000-12-22 01:43:59 +0000371 if ((u_char) buf[0] == escape_char)
Damien Miller95def091999-11-25 00:26:21 +1100372 escape_pending = 1;
Ben Lindstrome9613cf2001-03-05 06:14:02 +0000373 else
Damien Miller95def091999-11-25 00:26:21 +1100374 buffer_append(&stdin_buffer, buf, 1);
Damien Miller95def091999-11-25 00:26:21 +1100375 }
Damien Miller95def091999-11-25 00:26:21 +1100376 leave_non_blocking();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000377 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000378}
379
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000380
Damien Miller5428f641999-11-25 11:54:57 +1100381/*
382 * Make packets from buffered stdin data, and buffer them for sending to the
383 * connection.
384 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000385
Ben Lindstrombba81212001-06-25 05:01:22 +0000386static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000387client_make_packets_from_stdin_data(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000388{
Ben Lindstrom46c16222000-12-22 01:43:59 +0000389 u_int len;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000390
Damien Miller95def091999-11-25 00:26:21 +1100391 /* Send buffered stdin data to the server. */
392 while (buffer_len(&stdin_buffer) > 0 &&
Damien Miller9f0f5c62001-12-21 14:45:46 +1100393 packet_not_very_much_data_to_write()) {
Damien Miller95def091999-11-25 00:26:21 +1100394 len = buffer_len(&stdin_buffer);
395 /* Keep the packets at reasonable size. */
396 if (len > packet_get_maxsize())
397 len = packet_get_maxsize();
398 packet_start(SSH_CMSG_STDIN_DATA);
399 packet_put_string(buffer_ptr(&stdin_buffer), len);
400 packet_send();
401 buffer_consume(&stdin_buffer, len);
Ben Lindstrome9613cf2001-03-05 06:14:02 +0000402 stdin_bytes += len;
Damien Miller95def091999-11-25 00:26:21 +1100403 /* If we have a pending EOF, send it now. */
404 if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
405 packet_start(SSH_CMSG_EOF);
406 packet_send();
407 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000408 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000409}
410
Damien Miller5428f641999-11-25 11:54:57 +1100411/*
412 * Checks if the client window has changed, and sends a packet about it to
413 * the server if so. The actual change is detected elsewhere (by a software
414 * interrupt on Unix); this just checks the flag and sends a message if
415 * appropriate.
416 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000417
Ben Lindstrombba81212001-06-25 05:01:22 +0000418static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000419client_check_window_change(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000420{
Damien Miller1383bd82000-04-06 12:32:37 +1000421 struct winsize ws;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000422
Damien Miller1383bd82000-04-06 12:32:37 +1000423 if (! received_window_change_signal)
424 return;
425 /** XXX race */
426 received_window_change_signal = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000427
Damien Millerd3444942000-09-30 14:20:03 +1100428 debug2("client_check_window_change: changed");
Damien Miller1383bd82000-04-06 12:32:37 +1000429
430 if (compat20) {
Damien Miller0e220db2004-06-15 10:34:08 +1000431 channel_send_window_changes();
Damien Miller1383bd82000-04-06 12:32:37 +1000432 } else {
Damien Miller0e220db2004-06-15 10:34:08 +1000433 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
434 return;
Damien Miller1383bd82000-04-06 12:32:37 +1000435 packet_start(SSH_CMSG_WINDOW_SIZE);
436 packet_put_int(ws.ws_row);
437 packet_put_int(ws.ws_col);
438 packet_put_int(ws.ws_xpixel);
439 packet_put_int(ws.ws_ypixel);
440 packet_send();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000441 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000442}
443
Damien Miller509b0102003-12-17 16:33:10 +1100444static void
445client_global_request_reply(int type, u_int32_t seq, void *ctxt)
446{
447 server_alive_timeouts = 0;
448 client_global_request_reply_fwd(type, seq, ctxt);
449}
450
451static void
452server_alive_check(void)
453{
454 if (++server_alive_timeouts > options.server_alive_count_max)
455 packet_disconnect("Timeout, server not responding.");
456 packet_start(SSH2_MSG_GLOBAL_REQUEST);
457 packet_put_cstring("keepalive@openssh.com");
458 packet_put_char(1); /* boolean: want reply */
459 packet_send();
460}
461
Damien Miller5428f641999-11-25 11:54:57 +1100462/*
463 * Waits until the client can do something (some data becomes available on
464 * one of the file descriptors).
465 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000466static void
Damien Miller5e953212001-01-30 09:14:00 +1100467client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000468 int *maxfdp, u_int *nallocp, int rekeying)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000469{
Damien Miller509b0102003-12-17 16:33:10 +1100470 struct timeval tv, *tvp;
471 int ret;
472
Damien Miller5e953212001-01-30 09:14:00 +1100473 /* Add any selections by the channel mechanism. */
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000474 channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000475
Damien Miller1383bd82000-04-06 12:32:37 +1000476 if (!compat20) {
477 /* Read from the connection, unless our buffers are full. */
478 if (buffer_len(&stdout_buffer) < buffer_high &&
479 buffer_len(&stderr_buffer) < buffer_high &&
480 channel_not_very_much_buffered_data())
Damien Miller5e953212001-01-30 09:14:00 +1100481 FD_SET(connection_in, *readsetp);
Damien Miller1383bd82000-04-06 12:32:37 +1000482 /*
483 * Read from stdin, unless we have seen EOF or have very much
484 * buffered data to send to the server.
485 */
486 if (!stdin_eof && packet_not_very_much_data_to_write())
Damien Miller5e953212001-01-30 09:14:00 +1100487 FD_SET(fileno(stdin), *readsetp);
Damien Miller1383bd82000-04-06 12:32:37 +1000488
489 /* Select stdout/stderr if have data in buffer. */
490 if (buffer_len(&stdout_buffer) > 0)
Damien Miller5e953212001-01-30 09:14:00 +1100491 FD_SET(fileno(stdout), *writesetp);
Damien Miller1383bd82000-04-06 12:32:37 +1000492 if (buffer_len(&stderr_buffer) > 0)
Damien Miller5e953212001-01-30 09:14:00 +1100493 FD_SET(fileno(stderr), *writesetp);
Damien Miller1383bd82000-04-06 12:32:37 +1000494 } else {
Ben Lindstromc8b3f472001-05-17 03:19:40 +0000495 /* channel_prepare_select could have closed the last channel */
Damien Miller164a7f42001-10-12 11:36:09 +1000496 if (session_closed && !channel_still_open() &&
497 !packet_have_data_to_write()) {
498 /* clear mask since we did not call select() */
Damien Miller79faeff2001-11-12 11:06:32 +1100499 memset(*readsetp, 0, *nallocp);
500 memset(*writesetp, 0, *nallocp);
Damien Miller164a7f42001-10-12 11:36:09 +1000501 return;
Ben Lindstromc8b3f472001-05-17 03:19:40 +0000502 } else {
503 FD_SET(connection_in, *readsetp);
504 }
Damien Miller1383bd82000-04-06 12:32:37 +1000505 }
506
Damien Miller95def091999-11-25 00:26:21 +1100507 /* Select server connection if have data to write to the server. */
508 if (packet_have_data_to_write())
Damien Miller5e953212001-01-30 09:14:00 +1100509 FD_SET(connection_out, *writesetp);
Damien Miller95def091999-11-25 00:26:21 +1100510
Damien Miller0e220db2004-06-15 10:34:08 +1000511 if (control_fd != -1)
512 FD_SET(control_fd, *readsetp);
513
Damien Miller5428f641999-11-25 11:54:57 +1100514 /*
515 * Wait for something to happen. This will suspend the process until
516 * some selected descriptor can be read, written, or has some other
Damien Miller509b0102003-12-17 16:33:10 +1100517 * event pending.
Damien Miller5428f641999-11-25 11:54:57 +1100518 */
Damien Miller95def091999-11-25 00:26:21 +1100519
Damien Miller509b0102003-12-17 16:33:10 +1100520 if (options.server_alive_interval == 0 || !compat20)
521 tvp = NULL;
Darren Tuckerfc959702004-07-17 16:12:08 +1000522 else {
Damien Miller509b0102003-12-17 16:33:10 +1100523 tv.tv_sec = options.server_alive_interval;
524 tv.tv_usec = 0;
525 tvp = &tv;
526 }
527 ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
528 if (ret < 0) {
Damien Miller95def091999-11-25 00:26:21 +1100529 char buf[100];
Ben Lindstromf9452512001-02-15 03:12:08 +0000530
531 /*
532 * We have to clear the select masks, because we return.
533 * We have to return, because the mainloop checks for the flags
534 * set by the signal handlers.
535 */
Damien Miller79faeff2001-11-12 11:06:32 +1100536 memset(*readsetp, 0, *nallocp);
537 memset(*writesetp, 0, *nallocp);
Ben Lindstromf9452512001-02-15 03:12:08 +0000538
Damien Miller95def091999-11-25 00:26:21 +1100539 if (errno == EINTR)
540 return;
541 /* Note: we might still have data in the buffers. */
542 snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
543 buffer_append(&stderr_buffer, buf, strlen(buf));
Damien Miller95def091999-11-25 00:26:21 +1100544 quit_pending = 1;
Damien Miller509b0102003-12-17 16:33:10 +1100545 } else if (ret == 0)
546 server_alive_check();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000547}
548
Ben Lindstrombba81212001-06-25 05:01:22 +0000549static void
Damien Millerad833b32000-08-23 10:46:23 +1000550client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000551{
Damien Miller95def091999-11-25 00:26:21 +1100552 /* Flush stdout and stderr buffers. */
Damien Millerad833b32000-08-23 10:46:23 +1000553 if (buffer_len(bout) > 0)
Darren Tucker9f63f222003-07-03 13:46:56 +1000554 atomicio(vwrite, fileno(stdout), buffer_ptr(bout), buffer_len(bout));
Damien Millerad833b32000-08-23 10:46:23 +1000555 if (buffer_len(berr) > 0)
Darren Tucker9f63f222003-07-03 13:46:56 +1000556 atomicio(vwrite, fileno(stderr), buffer_ptr(berr), buffer_len(berr));
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000557
Damien Miller95def091999-11-25 00:26:21 +1100558 leave_raw_mode();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000559
Damien Miller5428f641999-11-25 11:54:57 +1100560 /*
561 * Free (and clear) the buffer to reduce the amount of data that gets
562 * written to swap.
563 */
Damien Millerad833b32000-08-23 10:46:23 +1000564 buffer_free(bin);
565 buffer_free(bout);
566 buffer_free(berr);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000567
Damien Miller95def091999-11-25 00:26:21 +1100568 /* Send the suspend signal to the program itself. */
569 kill(getpid(), SIGTSTP);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000570
Darren Tucker5d78de62004-11-05 20:35:44 +1100571 /* Reset window sizes in case they have changed */
572 received_window_change_signal = 1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000573
Damien Miller95def091999-11-25 00:26:21 +1100574 /* OK, we have been continued by the user. Reinitialize buffers. */
Damien Millerad833b32000-08-23 10:46:23 +1000575 buffer_init(bin);
576 buffer_init(bout);
577 buffer_init(berr);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000578
Damien Miller95def091999-11-25 00:26:21 +1100579 enter_raw_mode();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000580}
581
Ben Lindstrombba81212001-06-25 05:01:22 +0000582static void
Damien Miller1383bd82000-04-06 12:32:37 +1000583client_process_net_input(fd_set * readset)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000584{
Damien Miller1383bd82000-04-06 12:32:37 +1000585 int len;
586 char buf[8192];
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000587
Damien Miller5428f641999-11-25 11:54:57 +1100588 /*
589 * Read input from the server, and add any such data to the buffer of
590 * the packet subsystem.
591 */
Damien Miller95def091999-11-25 00:26:21 +1100592 if (FD_ISSET(connection_in, readset)) {
593 /* Read as much as possible. */
594 len = read(connection_in, buf, sizeof(buf));
595 if (len == 0) {
596 /* Received EOF. The remote host has closed the connection. */
597 snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n",
598 host);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000599 buffer_append(&stderr_buffer, buf, strlen(buf));
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000600 quit_pending = 1;
601 return;
Damien Miller95def091999-11-25 00:26:21 +1100602 }
Damien Miller5428f641999-11-25 11:54:57 +1100603 /*
604 * There is a kernel bug on Solaris that causes select to
605 * sometimes wake up even though there is no data available.
606 */
Ben Lindstromebc88272001-03-06 03:34:40 +0000607 if (len < 0 && (errno == EAGAIN || errno == EINTR))
Damien Miller95def091999-11-25 00:26:21 +1100608 len = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000609
Damien Miller95def091999-11-25 00:26:21 +1100610 if (len < 0) {
611 /* An error has encountered. Perhaps there is a network problem. */
612 snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n",
613 host, strerror(errno));
614 buffer_append(&stderr_buffer, buf, strlen(buf));
Damien Miller95def091999-11-25 00:26:21 +1100615 quit_pending = 1;
616 return;
617 }
618 packet_process_incoming(buf, len);
619 }
Damien Miller1383bd82000-04-06 12:32:37 +1000620}
621
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000622static void
Damien Miller0e220db2004-06-15 10:34:08 +1000623client_subsystem_reply(int type, u_int32_t seq, void *ctxt)
624{
625 int id;
626 Channel *c;
Darren Tuckerfc959702004-07-17 16:12:08 +1000627
Damien Miller0e220db2004-06-15 10:34:08 +1000628 id = packet_get_int();
629 packet_check_eom();
630
631 if ((c = channel_lookup(id)) == NULL) {
632 error("%s: no channel for id %d", __func__, id);
633 return;
634 }
635
636 if (type == SSH2_MSG_CHANNEL_SUCCESS)
637 debug2("Request suceeded on channel %d", id);
638 else if (type == SSH2_MSG_CHANNEL_FAILURE) {
639 error("Request failed on channel %d", id);
640 channel_free(c);
641 }
642}
643
644static void
645client_extra_session2_setup(int id, void *arg)
646{
647 struct confirm_ctx *cctx = arg;
Damien Miller13390022005-07-06 09:44:19 +1000648 const char *display;
Damien Miller0e220db2004-06-15 10:34:08 +1000649 Channel *c;
Damien Miller3756dce2004-06-18 01:17:29 +1000650 int i;
Darren Tuckerfc959702004-07-17 16:12:08 +1000651
Damien Miller0e220db2004-06-15 10:34:08 +1000652 if (cctx == NULL)
653 fatal("%s: cctx == NULL", __func__);
654 if ((c = channel_lookup(id)) == NULL)
655 fatal("%s: no channel for id %d", __func__, id);
656
Damien Miller46d38de2005-07-17 17:02:09 +1000657 display = getenv("DISPLAY");
Damien Miller13390022005-07-06 09:44:19 +1000658 if (cctx->want_x_fwd && options.forward_x11 && display != NULL) {
659 char *proto, *data;
660 /* Get reasonable local authentication information. */
661 client_x11_get_proto(display, options.xauth_location,
662 options.forward_x11_trusted, &proto, &data);
663 /* Request forwarding with authentication spoofing. */
664 debug("Requesting X11 forwarding with authentication spoofing.");
665 x11_request_forwarding_with_spoofing(id, display, proto, data);
666 /* XXX wait for reply */
667 }
668
669 if (cctx->want_agent_fwd && options.forward_agent) {
670 debug("Requesting authentication agent forwarding.");
671 channel_request_start(id, "auth-agent-req@openssh.com", 0);
672 packet_send();
673 }
674
Darren Tuckerfc959702004-07-17 16:12:08 +1000675 client_session2_setup(id, cctx->want_tty, cctx->want_subsys,
Damien Miller3756dce2004-06-18 01:17:29 +1000676 cctx->term, &cctx->tio, c->rfd, &cctx->cmd, cctx->env,
Damien Miller0e220db2004-06-15 10:34:08 +1000677 client_subsystem_reply);
Damien Miller23f07702004-06-18 01:19:03 +1000678
Damien Miller0e220db2004-06-15 10:34:08 +1000679 c->confirm_ctx = NULL;
680 buffer_free(&cctx->cmd);
Damien Miller3756dce2004-06-18 01:17:29 +1000681 xfree(cctx->term);
682 if (cctx->env != NULL) {
683 for (i = 0; cctx->env[i] != NULL; i++)
684 xfree(cctx->env[i]);
685 xfree(cctx->env);
Darren Tuckerfc959702004-07-17 16:12:08 +1000686 }
Damien Miller3756dce2004-06-18 01:17:29 +1000687 xfree(cctx);
Damien Miller0e220db2004-06-15 10:34:08 +1000688}
689
690static void
691client_process_control(fd_set * readset)
692{
693 Buffer m;
694 Channel *c;
Damien Millereccb9de2005-06-17 12:59:34 +1000695 int client_fd, new_fd[3], ver, allowed;
Damien Miller0e220db2004-06-15 10:34:08 +1000696 socklen_t addrlen;
697 struct sockaddr_storage addr;
698 struct confirm_ctx *cctx;
699 char *cmd;
Damien Millereccb9de2005-06-17 12:59:34 +1000700 u_int i, len, env_len, command, flags;
Damien Miller0e220db2004-06-15 10:34:08 +1000701 uid_t euid;
702 gid_t egid;
703
704 /*
705 * Accept connection on control socket
706 */
707 if (control_fd == -1 || !FD_ISSET(control_fd, readset))
708 return;
709
710 memset(&addr, 0, sizeof(addr));
711 addrlen = sizeof(addr);
712 if ((client_fd = accept(control_fd,
713 (struct sockaddr*)&addr, &addrlen)) == -1) {
714 error("%s accept: %s", __func__, strerror(errno));
715 return;
716 }
717
718 if (getpeereid(client_fd, &euid, &egid) < 0) {
719 error("%s getpeereid failed: %s", __func__, strerror(errno));
720 close(client_fd);
721 return;
722 }
723 if ((euid != 0) && (getuid() != euid)) {
724 error("control mode uid mismatch: peer euid %u != uid %u",
725 (u_int) euid, (u_int) getuid());
726 close(client_fd);
727 return;
728 }
Damien Miller23f07702004-06-18 01:19:03 +1000729
Damien Miller0e220db2004-06-15 10:34:08 +1000730 unset_nonblock(client_fd);
731
Darren Tucker7ebfc102004-11-07 20:06:19 +1100732 /* Read command */
Damien Miller0e220db2004-06-15 10:34:08 +1000733 buffer_init(&m);
Darren Tucker7ebfc102004-11-07 20:06:19 +1100734 if (ssh_msg_recv(client_fd, &m) == -1) {
735 error("%s: client msg_recv failed", __func__);
736 close(client_fd);
737 buffer_free(&m);
738 return;
739 }
Damien Miller13390022005-07-06 09:44:19 +1000740 if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
Darren Tucker7ebfc102004-11-07 20:06:19 +1100741 error("%s: wrong client version %d", __func__, ver);
742 buffer_free(&m);
743 close(client_fd);
744 return;
745 }
Damien Miller0e220db2004-06-15 10:34:08 +1000746
Darren Tucker7ebfc102004-11-07 20:06:19 +1100747 allowed = 1;
748 command = buffer_get_int(&m);
749 flags = buffer_get_int(&m);
750
751 buffer_clear(&m);
752
753 switch (command) {
754 case SSHMUX_COMMAND_OPEN:
Damien Millerd14b1e72005-06-16 13:19:41 +1000755 if (options.control_master == SSHCTL_MASTER_ASK ||
756 options.control_master == SSHCTL_MASTER_AUTO_ASK)
Darren Tucker7ebfc102004-11-07 20:06:19 +1100757 allowed = ask_permission("Allow shared connection "
758 "to %s? ", host);
759 /* continue below */
760 break;
761 case SSHMUX_COMMAND_TERMINATE:
Damien Millerd14b1e72005-06-16 13:19:41 +1000762 if (options.control_master == SSHCTL_MASTER_ASK ||
763 options.control_master == SSHCTL_MASTER_AUTO_ASK)
Darren Tucker7ebfc102004-11-07 20:06:19 +1100764 allowed = ask_permission("Terminate shared connection "
765 "to %s? ", host);
766 if (allowed)
767 quit_pending = 1;
Darren Tucker47eede72005-03-14 23:08:12 +1100768 /* FALLTHROUGH */
Darren Tucker7ebfc102004-11-07 20:06:19 +1100769 case SSHMUX_COMMAND_ALIVE_CHECK:
770 /* Reply for SSHMUX_COMMAND_TERMINATE and ALIVE_CHECK */
771 buffer_clear(&m);
772 buffer_put_int(&m, allowed);
773 buffer_put_int(&m, getpid());
Damien Miller13390022005-07-06 09:44:19 +1000774 if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
Darren Tucker7ebfc102004-11-07 20:06:19 +1100775 error("%s: client msg_send failed", __func__);
776 close(client_fd);
777 buffer_free(&m);
778 return;
779 }
780 buffer_free(&m);
781 close(client_fd);
782 return;
783 default:
784 error("Unsupported command %d", command);
785 buffer_free(&m);
786 close(client_fd);
787 return;
788 }
789
790 /* Reply for SSHMUX_COMMAND_OPEN */
791 buffer_clear(&m);
Damien Miller23f07702004-06-18 01:19:03 +1000792 buffer_put_int(&m, allowed);
Damien Miller0e220db2004-06-15 10:34:08 +1000793 buffer_put_int(&m, getpid());
Damien Miller13390022005-07-06 09:44:19 +1000794 if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
Damien Miller0e220db2004-06-15 10:34:08 +1000795 error("%s: client msg_send failed", __func__);
796 close(client_fd);
Damien Miller23f07702004-06-18 01:19:03 +1000797 buffer_free(&m);
Damien Miller0e220db2004-06-15 10:34:08 +1000798 return;
799 }
Damien Miller0e220db2004-06-15 10:34:08 +1000800
Damien Miller23f07702004-06-18 01:19:03 +1000801 if (!allowed) {
802 error("Refused control connection");
803 close(client_fd);
804 buffer_free(&m);
805 return;
806 }
807
Darren Tucker7ebfc102004-11-07 20:06:19 +1100808 buffer_clear(&m);
Damien Miller0e220db2004-06-15 10:34:08 +1000809 if (ssh_msg_recv(client_fd, &m) == -1) {
810 error("%s: client msg_recv failed", __func__);
811 close(client_fd);
Damien Miller23f07702004-06-18 01:19:03 +1000812 buffer_free(&m);
Damien Miller0e220db2004-06-15 10:34:08 +1000813 return;
814 }
Damien Miller13390022005-07-06 09:44:19 +1000815 if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
Damien Miller0e220db2004-06-15 10:34:08 +1000816 error("%s: wrong client version %d", __func__, ver);
817 buffer_free(&m);
818 close(client_fd);
819 return;
820 }
821
822 cctx = xmalloc(sizeof(*cctx));
823 memset(cctx, 0, sizeof(*cctx));
Darren Tucker7ebfc102004-11-07 20:06:19 +1100824 cctx->want_tty = (flags & SSHMUX_FLAG_TTY) != 0;
825 cctx->want_subsys = (flags & SSHMUX_FLAG_SUBSYS) != 0;
Damien Miller13390022005-07-06 09:44:19 +1000826 cctx->want_x_fwd = (flags & SSHMUX_FLAG_X11_FWD) != 0;
827 cctx->want_agent_fwd = (flags & SSHMUX_FLAG_AGENT_FWD) != 0;
Damien Miller0e220db2004-06-15 10:34:08 +1000828 cctx->term = buffer_get_string(&m, &len);
829
830 cmd = buffer_get_string(&m, &len);
831 buffer_init(&cctx->cmd);
832 buffer_append(&cctx->cmd, cmd, strlen(cmd));
833
Damien Miller3756dce2004-06-18 01:17:29 +1000834 env_len = buffer_get_int(&m);
835 env_len = MIN(env_len, 4096);
836 debug3("%s: receiving %d env vars", __func__, env_len);
837 if (env_len != 0) {
838 cctx->env = xmalloc(sizeof(*cctx->env) * (env_len + 1));
839 for (i = 0; i < env_len; i++)
840 cctx->env[i] = buffer_get_string(&m, &len);
841 cctx->env[i] = NULL;
842 }
843
Damien Miller0e220db2004-06-15 10:34:08 +1000844 debug2("%s: accepted tty %d, subsys %d, cmd %s", __func__,
845 cctx->want_tty, cctx->want_subsys, cmd);
846
847 /* Gather fds from client */
848 new_fd[0] = mm_receive_fd(client_fd);
849 new_fd[1] = mm_receive_fd(client_fd);
850 new_fd[2] = mm_receive_fd(client_fd);
851
852 debug2("%s: got fds stdin %d, stdout %d, stderr %d", __func__,
853 new_fd[0], new_fd[1], new_fd[2]);
854
855 /* Try to pick up ttymodes from client before it goes raw */
856 if (cctx->want_tty && tcgetattr(new_fd[0], &cctx->tio) == -1)
857 error("%s: tcgetattr: %s", __func__, strerror(errno));
858
Darren Tucker7ebfc102004-11-07 20:06:19 +1100859 /* This roundtrip is just for synchronisation of ttymodes */
Damien Miller0e220db2004-06-15 10:34:08 +1000860 buffer_clear(&m);
Damien Miller13390022005-07-06 09:44:19 +1000861 if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
Damien Miller0e220db2004-06-15 10:34:08 +1000862 error("%s: client msg_send failed", __func__);
863 close(client_fd);
864 close(new_fd[0]);
865 close(new_fd[1]);
866 close(new_fd[2]);
Damien Miller23f07702004-06-18 01:19:03 +1000867 buffer_free(&m);
Darren Tucker7ebfc102004-11-07 20:06:19 +1100868 xfree(cctx->term);
869 if (env_len != 0) {
870 for (i = 0; i < env_len; i++)
871 xfree(cctx->env[i]);
872 xfree(cctx->env);
873 }
Damien Miller0e220db2004-06-15 10:34:08 +1000874 return;
875 }
876 buffer_free(&m);
877
878 /* enable nonblocking unless tty */
879 if (!isatty(new_fd[0]))
880 set_nonblock(new_fd[0]);
881 if (!isatty(new_fd[1]))
882 set_nonblock(new_fd[1]);
883 if (!isatty(new_fd[2]))
884 set_nonblock(new_fd[2]);
885
886 set_nonblock(client_fd);
887
Darren Tuckerfc959702004-07-17 16:12:08 +1000888 c = channel_new("session", SSH_CHANNEL_OPENING,
Damien Miller0e220db2004-06-15 10:34:08 +1000889 new_fd[0], new_fd[1], new_fd[2],
890 CHAN_SES_WINDOW_DEFAULT, CHAN_SES_PACKET_DEFAULT,
891 CHAN_EXTENDED_WRITE, "client-session", /*nonblock*/0);
892
893 /* XXX */
894 c->ctl_fd = client_fd;
895
896 debug3("%s: channel_new: %d", __func__, c->self);
897
898 channel_send_open(c->self);
899 channel_register_confirm(c->self, client_extra_session2_setup, cctx);
900}
901
902static void
Ben Lindstrom681d9322002-03-22 03:53:00 +0000903process_cmdline(void)
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000904{
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000905 void (*handler)(int);
Damien Millerf91ee4c2005-03-01 21:24:33 +1100906 char *s, *cmd, *cancel_host;
Darren Tuckere7066df2004-05-24 10:18:05 +1000907 int delete = 0;
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000908 int local = 0;
Damien Millerf91ee4c2005-03-01 21:24:33 +1100909 u_short cancel_port;
910 Forward fwd;
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000911
912 leave_raw_mode();
Ben Lindstrom5a6abda2002-06-09 19:41:48 +0000913 handler = signal(SIGINT, SIG_IGN);
Ben Lindstrom681d9322002-03-22 03:53:00 +0000914 cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000915 if (s == NULL)
916 goto out;
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000917 while (*s && isspace(*s))
918 s++;
Darren Tuckere7066df2004-05-24 10:18:05 +1000919 if (*s == '-')
920 s++; /* Skip cmdline '-', if any */
Darren Tuckere1675822004-05-24 10:13:07 +1000921 if (*s == '\0')
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000922 goto out;
Darren Tuckere7066df2004-05-24 10:18:05 +1000923
Darren Tucker1973c882004-05-24 10:34:36 +1000924 if (*s == 'h' || *s == 'H' || *s == '?') {
Darren Tuckere7066df2004-05-24 10:18:05 +1000925 logit("Commands:");
926 logit(" -Lport:host:hostport Request local forward");
927 logit(" -Rport:host:hostport Request remote forward");
928 logit(" -KRhostport Cancel remote forward");
Damien Millerd27b9472005-12-13 19:29:02 +1100929 if (!options.permit_local_command)
930 goto out;
931 logit(" !args Execute local command");
932 goto out;
933 }
934
935 if (*s == '!' && options.permit_local_command) {
936 s++;
937 ssh_local_cmd(s);
Darren Tuckere7066df2004-05-24 10:18:05 +1000938 goto out;
939 }
940
941 if (*s == 'K') {
942 delete = 1;
943 s++;
944 }
945 if (*s != 'L' && *s != 'R') {
Damien Miller996acd22003-04-09 20:59:48 +1000946 logit("Invalid command.");
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000947 goto out;
948 }
Darren Tuckere7066df2004-05-24 10:18:05 +1000949 if (*s == 'L')
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000950 local = 1;
Darren Tuckere7066df2004-05-24 10:18:05 +1000951 if (local && delete) {
952 logit("Not supported.");
953 goto out;
954 }
955 if ((!local || delete) && !compat20) {
Damien Miller996acd22003-04-09 20:59:48 +1000956 logit("Not supported for SSH protocol version 1.");
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000957 goto out;
958 }
Darren Tuckere7066df2004-05-24 10:18:05 +1000959
960 s++;
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000961 while (*s && isspace(*s))
962 s++;
963
Darren Tuckere7066df2004-05-24 10:18:05 +1000964 if (delete) {
Damien Millerf91ee4c2005-03-01 21:24:33 +1100965 cancel_port = 0;
966 cancel_host = hpdelim(&s); /* may be NULL */
967 if (s != NULL) {
968 cancel_port = a2port(s);
969 cancel_host = cleanhostname(cancel_host);
970 } else {
971 cancel_port = a2port(cancel_host);
972 cancel_host = NULL;
973 }
974 if (cancel_port == 0) {
975 logit("Bad forwarding close port");
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000976 goto out;
977 }
Damien Millerf91ee4c2005-03-01 21:24:33 +1100978 channel_request_rforward_cancel(cancel_host, cancel_port);
Darren Tuckere7066df2004-05-24 10:18:05 +1000979 } else {
Damien Millerf91ee4c2005-03-01 21:24:33 +1100980 if (!parse_forward(&fwd, s)) {
Darren Tuckere7066df2004-05-24 10:18:05 +1000981 logit("Bad forwarding specification.");
982 goto out;
983 }
Darren Tuckere7066df2004-05-24 10:18:05 +1000984 if (local) {
Damien Millerf91ee4c2005-03-01 21:24:33 +1100985 if (channel_setup_local_fwd_listener(fwd.listen_host,
986 fwd.listen_port, fwd.connect_host,
987 fwd.connect_port, options.gateway_ports) < 0) {
Darren Tuckere7066df2004-05-24 10:18:05 +1000988 logit("Port forwarding failed.");
989 goto out;
990 }
Damien Millerf91ee4c2005-03-01 21:24:33 +1100991 } else {
992 channel_request_remote_forwarding(fwd.listen_host,
993 fwd.listen_port, fwd.connect_host,
994 fwd.connect_port);
995 }
996
Darren Tuckere7066df2004-05-24 10:18:05 +1000997 logit("Forwarding port.");
998 }
999
Ben Lindstrom5589f4b2002-03-22 03:24:32 +00001000out:
1001 signal(SIGINT, handler);
1002 enter_raw_mode();
1003 if (cmd)
1004 xfree(cmd);
1005}
1006
Damien Millerad833b32000-08-23 10:46:23 +10001007/* process the characters one by one */
Ben Lindstrombba81212001-06-25 05:01:22 +00001008static int
Damien Millerad833b32000-08-23 10:46:23 +10001009process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
1010{
1011 char string[1024];
1012 pid_t pid;
1013 int bytes = 0;
Ben Lindstrom46c16222000-12-22 01:43:59 +00001014 u_int i;
1015 u_char ch;
Damien Millerad833b32000-08-23 10:46:23 +10001016 char *s;
1017
Damien Millereccb9de2005-06-17 12:59:34 +10001018 if (len <= 0)
1019 return (0);
1020
1021 for (i = 0; i < (u_int)len; i++) {
Damien Millerad833b32000-08-23 10:46:23 +10001022 /* Get one character at a time. */
1023 ch = buf[i];
1024
1025 if (escape_pending) {
1026 /* We have previously seen an escape character. */
1027 /* Clear the flag now. */
1028 escape_pending = 0;
1029
1030 /* Process the escaped character. */
1031 switch (ch) {
1032 case '.':
1033 /* Terminate the connection. */
1034 snprintf(string, sizeof string, "%c.\r\n", escape_char);
1035 buffer_append(berr, string, strlen(string));
Damien Millerad833b32000-08-23 10:46:23 +10001036
1037 quit_pending = 1;
1038 return -1;
1039
1040 case 'Z' - 64:
1041 /* Suspend the program. */
1042 /* Print a message to that effect to the user. */
1043 snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char);
1044 buffer_append(berr, string, strlen(string));
Damien Millerad833b32000-08-23 10:46:23 +10001045
1046 /* Restore terminal modes and suspend. */
1047 client_suspend_self(bin, bout, berr);
1048
1049 /* We have been continued. */
1050 continue;
1051
Damien Miller54c45982003-05-15 10:20:13 +10001052 case 'B':
1053 if (compat20) {
1054 snprintf(string, sizeof string,
1055 "%cB\r\n", escape_char);
1056 buffer_append(berr, string,
1057 strlen(string));
1058 channel_request_start(session_ident,
1059 "break", 0);
1060 packet_put_int(1000);
1061 packet_send();
1062 }
1063 continue;
1064
Ben Lindstromf28f6342001-04-04 02:03:04 +00001065 case 'R':
Ben Lindstrom11bd8992001-04-05 23:34:29 +00001066 if (compat20) {
1067 if (datafellows & SSH_BUG_NOREKEY)
Damien Miller996acd22003-04-09 20:59:48 +10001068 logit("Server does not support re-keying");
Ben Lindstrom11bd8992001-04-05 23:34:29 +00001069 else
1070 need_rekeying = 1;
1071 }
Ben Lindstromf28f6342001-04-04 02:03:04 +00001072 continue;
1073
Damien Millerad833b32000-08-23 10:46:23 +10001074 case '&':
Damien Millerad833b32000-08-23 10:46:23 +10001075 /*
1076 * Detach the program (continue to serve connections,
1077 * but put in background and no more new connections).
1078 */
Damien Miller96507ef2001-11-12 10:52:25 +11001079 /* Restore tty modes. */
1080 leave_raw_mode();
1081
1082 /* Stop listening for new connections. */
1083 channel_stop_listening();
1084
1085 snprintf(string, sizeof string,
1086 "%c& [backgrounded]\n", escape_char);
1087 buffer_append(berr, string, strlen(string));
1088
1089 /* Fork into background. */
1090 pid = fork();
1091 if (pid < 0) {
1092 error("fork: %.100s", strerror(errno));
1093 continue;
1094 }
1095 if (pid != 0) { /* This is the parent. */
1096 /* The parent just exits. */
1097 exit(0);
1098 }
1099 /* The child continues serving connections. */
1100 if (compat20) {
1101 buffer_append(bin, "\004", 1);
1102 /* fake EOF on stdin */
1103 return -1;
1104 } else if (!stdin_eof) {
Damien Millerad833b32000-08-23 10:46:23 +10001105 /*
1106 * Sending SSH_CMSG_EOF alone does not always appear
1107 * to be enough. So we try to send an EOF character
1108 * first.
1109 */
1110 packet_start(SSH_CMSG_STDIN_DATA);
1111 packet_put_string("\004", 1);
1112 packet_send();
1113 /* Close stdin. */
1114 stdin_eof = 1;
1115 if (buffer_len(bin) == 0) {
1116 packet_start(SSH_CMSG_EOF);
1117 packet_send();
1118 }
1119 }
Damien Miller96507ef2001-11-12 10:52:25 +11001120 continue;
Damien Millerad833b32000-08-23 10:46:23 +10001121
1122 case '?':
1123 snprintf(string, sizeof string,
1124"%c?\r\n\
1125Supported escape sequences:\r\n\
Damien Miller06692862002-09-04 16:32:10 +10001126%c. - terminate connection\r\n\
Damien Miller54c45982003-05-15 10:20:13 +10001127%cB - send a BREAK to the remote system\r\n\
Damien Miller06692862002-09-04 16:32:10 +10001128%cC - open a command line\r\n\
1129%cR - Request rekey (SSH protocol 2 only)\r\n\
1130%c^Z - suspend ssh\r\n\
1131%c# - list forwarded connections\r\n\
1132%c& - background ssh (when waiting for connections to terminate)\r\n\
1133%c? - this message\r\n\
1134%c%c - send the escape character by typing it twice\r\n\
Damien Millerad833b32000-08-23 10:46:23 +10001135(Note that escapes are only recognized immediately after newline.)\r\n",
Damien Miller06692862002-09-04 16:32:10 +10001136 escape_char, escape_char, escape_char, escape_char,
1137 escape_char, escape_char, escape_char, escape_char,
Damien Miller54c45982003-05-15 10:20:13 +10001138 escape_char, escape_char, escape_char);
Damien Millerad833b32000-08-23 10:46:23 +10001139 buffer_append(berr, string, strlen(string));
1140 continue;
1141
1142 case '#':
1143 snprintf(string, sizeof string, "%c#\r\n", escape_char);
1144 buffer_append(berr, string, strlen(string));
1145 s = channel_open_message();
1146 buffer_append(berr, s, strlen(s));
1147 xfree(s);
1148 continue;
1149
Ben Lindstrom5589f4b2002-03-22 03:24:32 +00001150 case 'C':
Ben Lindstrom681d9322002-03-22 03:53:00 +00001151 process_cmdline();
Ben Lindstrom5589f4b2002-03-22 03:24:32 +00001152 continue;
1153
Damien Millerad833b32000-08-23 10:46:23 +10001154 default:
1155 if (ch != escape_char) {
1156 buffer_put_char(bin, escape_char);
1157 bytes++;
1158 }
1159 /* Escaped characters fall through here */
1160 break;
1161 }
1162 } else {
1163 /*
1164 * The previous character was not an escape char. Check if this
1165 * is an escape.
1166 */
1167 if (last_was_cr && ch == escape_char) {
1168 /* It is. Set the flag and continue to next character. */
1169 escape_pending = 1;
1170 continue;
1171 }
1172 }
1173
1174 /*
1175 * Normal character. Record whether it was a newline,
1176 * and append it to the buffer.
1177 */
1178 last_was_cr = (ch == '\r' || ch == '\n');
1179 buffer_put_char(bin, ch);
1180 bytes++;
1181 }
1182 return bytes;
1183}
1184
Ben Lindstrombba81212001-06-25 05:01:22 +00001185static void
Damien Miller1383bd82000-04-06 12:32:37 +10001186client_process_input(fd_set * readset)
1187{
Damien Miller166fca82000-04-20 07:42:21 +10001188 int len;
Damien Millerad833b32000-08-23 10:46:23 +10001189 char buf[8192];
Damien Miller1383bd82000-04-06 12:32:37 +10001190
Damien Miller95def091999-11-25 00:26:21 +11001191 /* Read input from stdin. */
1192 if (FD_ISSET(fileno(stdin), readset)) {
1193 /* Read as much as possible. */
1194 len = read(fileno(stdin), buf, sizeof(buf));
Ben Lindstrom4c8cff12001-04-17 18:09:42 +00001195 if (len < 0 && (errno == EAGAIN || errno == EINTR))
1196 return; /* we'll try again later */
Damien Miller95def091999-11-25 00:26:21 +11001197 if (len <= 0) {
Damien Miller5428f641999-11-25 11:54:57 +11001198 /*
1199 * Received EOF or error. They are treated
1200 * similarly, except that an error message is printed
1201 * if it was an error condition.
1202 */
Damien Miller95def091999-11-25 00:26:21 +11001203 if (len < 0) {
1204 snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno));
1205 buffer_append(&stderr_buffer, buf, strlen(buf));
Damien Miller95def091999-11-25 00:26:21 +11001206 }
1207 /* Mark that we have seen EOF. */
1208 stdin_eof = 1;
Damien Miller5428f641999-11-25 11:54:57 +11001209 /*
1210 * Send an EOF message to the server unless there is
1211 * data in the buffer. If there is data in the
1212 * buffer, no message will be sent now. Code
1213 * elsewhere will send the EOF when the buffer
1214 * becomes empty if stdin_eof is set.
1215 */
Damien Miller95def091999-11-25 00:26:21 +11001216 if (buffer_len(&stdin_buffer) == 0) {
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001217 packet_start(SSH_CMSG_EOF);
1218 packet_send();
Damien Miller95def091999-11-25 00:26:21 +11001219 }
Ben Lindstrom2b1f71b2001-06-05 20:32:21 +00001220 } else if (escape_char == SSH_ESCAPECHAR_NONE) {
Damien Miller5428f641999-11-25 11:54:57 +11001221 /*
1222 * Normal successful read, and no escape character.
1223 * Just append the data to buffer.
1224 */
Damien Miller95def091999-11-25 00:26:21 +11001225 buffer_append(&stdin_buffer, buf, len);
Damien Miller95def091999-11-25 00:26:21 +11001226 } else {
Damien Miller5428f641999-11-25 11:54:57 +11001227 /*
1228 * Normal, successful read. But we have an escape character
1229 * and have to process the characters one by one.
1230 */
Ben Lindstrome9613cf2001-03-05 06:14:02 +00001231 if (process_escapes(&stdin_buffer, &stdout_buffer,
1232 &stderr_buffer, buf, len) == -1)
Damien Millerad833b32000-08-23 10:46:23 +10001233 return;
Damien Miller95def091999-11-25 00:26:21 +11001234 }
1235 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001236}
1237
Ben Lindstrombba81212001-06-25 05:01:22 +00001238static void
Damien Miller95def091999-11-25 00:26:21 +11001239client_process_output(fd_set * writeset)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001240{
Damien Miller95def091999-11-25 00:26:21 +11001241 int len;
1242 char buf[100];
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001243
Damien Miller95def091999-11-25 00:26:21 +11001244 /* Write buffered output to stdout. */
1245 if (FD_ISSET(fileno(stdout), writeset)) {
1246 /* Write as much data as possible. */
1247 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
Damien Miller037a0dc1999-12-07 15:38:31 +11001248 buffer_len(&stdout_buffer));
Damien Miller95def091999-11-25 00:26:21 +11001249 if (len <= 0) {
Ben Lindstrom4c8cff12001-04-17 18:09:42 +00001250 if (errno == EINTR || errno == EAGAIN)
Damien Miller95def091999-11-25 00:26:21 +11001251 len = 0;
1252 else {
Damien Miller5428f641999-11-25 11:54:57 +11001253 /*
1254 * An error or EOF was encountered. Put an
1255 * error message to stderr buffer.
1256 */
Damien Miller95def091999-11-25 00:26:21 +11001257 snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno));
1258 buffer_append(&stderr_buffer, buf, strlen(buf));
Damien Miller95def091999-11-25 00:26:21 +11001259 quit_pending = 1;
1260 return;
1261 }
1262 }
1263 /* Consume printed data from the buffer. */
1264 buffer_consume(&stdout_buffer, len);
Ben Lindstroma3700052001-04-05 23:26:32 +00001265 stdout_bytes += len;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001266 }
Damien Miller95def091999-11-25 00:26:21 +11001267 /* Write buffered output to stderr. */
1268 if (FD_ISSET(fileno(stderr), writeset)) {
1269 /* Write as much data as possible. */
1270 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
Damien Miller037a0dc1999-12-07 15:38:31 +11001271 buffer_len(&stderr_buffer));
Damien Miller95def091999-11-25 00:26:21 +11001272 if (len <= 0) {
Ben Lindstrom4c8cff12001-04-17 18:09:42 +00001273 if (errno == EINTR || errno == EAGAIN)
Damien Miller95def091999-11-25 00:26:21 +11001274 len = 0;
1275 else {
Damien Miller5428f641999-11-25 11:54:57 +11001276 /* EOF or error, but can't even print error message. */
Damien Miller95def091999-11-25 00:26:21 +11001277 quit_pending = 1;
1278 return;
1279 }
1280 }
1281 /* Consume printed characters from the buffer. */
1282 buffer_consume(&stderr_buffer, len);
Ben Lindstroma3700052001-04-05 23:26:32 +00001283 stderr_bytes += len;
Damien Miller95def091999-11-25 00:26:21 +11001284 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001285}
1286
Damien Miller5428f641999-11-25 11:54:57 +11001287/*
Damien Millerb38eff82000-04-01 11:09:21 +10001288 * Get packets from the connection input buffer, and process them as long as
1289 * there are packets available.
1290 *
1291 * Any unknown packets received during the actual
1292 * session cause the session to terminate. This is
1293 * intended to make debugging easier since no
1294 * confirmations are sent. Any compatible protocol
1295 * extensions must be negotiated during the
1296 * preparatory phase.
1297 */
1298
Ben Lindstrombba81212001-06-25 05:01:22 +00001299static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00001300client_process_buffered_input_packets(void)
Damien Millerb38eff82000-04-01 11:09:21 +10001301{
Ben Lindstromf28f6342001-04-04 02:03:04 +00001302 dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL);
Damien Millerb38eff82000-04-01 11:09:21 +10001303}
1304
Damien Millerad833b32000-08-23 10:46:23 +10001305/* scan buf[] for '~' before sending data to the peer */
1306
Ben Lindstrombba81212001-06-25 05:01:22 +00001307static int
Damien Millerad833b32000-08-23 10:46:23 +10001308simple_escape_filter(Channel *c, char *buf, int len)
1309{
1310 /* XXX we assume c->extended is writeable */
1311 return process_escapes(&c->input, &c->output, &c->extended, buf, len);
1312}
1313
Ben Lindstrombba81212001-06-25 05:01:22 +00001314static void
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001315client_channel_closed(int id, void *arg)
1316{
Damien Miller3ec27592001-10-12 11:35:04 +10001317 channel_cancel_cleanup(id);
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001318 session_closed = 1;
Darren Tucker9a2c4cd2003-09-22 21:16:05 +10001319 leave_raw_mode();
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001320}
1321
Damien Millerb38eff82000-04-01 11:09:21 +10001322/*
Damien Miller5428f641999-11-25 11:54:57 +11001323 * Implements the interactive session with the server. This is called after
1324 * the user has been authenticated, and a command has been started on the
Ben Lindstrom2b1f71b2001-06-05 20:32:21 +00001325 * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1326 * used as an escape character for terminating or suspending the session.
Damien Miller5428f641999-11-25 11:54:57 +11001327 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001328
Damien Miller4af51302000-04-16 11:18:38 +10001329int
Damien Millerad833b32000-08-23 10:46:23 +10001330client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001331{
Damien Miller5e953212001-01-30 09:14:00 +11001332 fd_set *readset = NULL, *writeset = NULL;
Damien Miller95def091999-11-25 00:26:21 +11001333 double start_time, total_time;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10001334 int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1335 u_int nalloc = 0;
Damien Miller95def091999-11-25 00:26:21 +11001336 char buf[100];
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001337
Damien Miller95def091999-11-25 00:26:21 +11001338 debug("Entering interactive session.");
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001339
Damien Miller95def091999-11-25 00:26:21 +11001340 start_time = get_current_time();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001341
Damien Miller95def091999-11-25 00:26:21 +11001342 /* Initialize variables. */
1343 escape_pending = 0;
1344 last_was_cr = 1;
1345 exit_status = -1;
1346 stdin_eof = 0;
1347 buffer_high = 64 * 1024;
1348 connection_in = packet_get_connection_in();
1349 connection_out = packet_get_connection_out();
Damien Miller5e953212001-01-30 09:14:00 +11001350 max_fd = MAX(connection_in, connection_out);
Damien Miller0e220db2004-06-15 10:34:08 +10001351 if (control_fd != -1)
1352 max_fd = MAX(max_fd, control_fd);
Damien Miller5e953212001-01-30 09:14:00 +11001353
1354 if (!compat20) {
Ben Lindstrom302ea6f2001-04-16 02:01:25 +00001355 /* enable nonblocking unless tty */
1356 if (!isatty(fileno(stdin)))
1357 set_nonblock(fileno(stdin));
1358 if (!isatty(fileno(stdout)))
1359 set_nonblock(fileno(stdout));
1360 if (!isatty(fileno(stderr)))
1361 set_nonblock(fileno(stderr));
Damien Miller5e953212001-01-30 09:14:00 +11001362 max_fd = MAX(max_fd, fileno(stdin));
1363 max_fd = MAX(max_fd, fileno(stdout));
1364 max_fd = MAX(max_fd, fileno(stderr));
1365 }
Damien Miller95def091999-11-25 00:26:21 +11001366 stdin_bytes = 0;
1367 stdout_bytes = 0;
1368 stderr_bytes = 0;
1369 quit_pending = 0;
1370 escape_char = escape_char_arg;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001371
Damien Miller95def091999-11-25 00:26:21 +11001372 /* Initialize buffers. */
1373 buffer_init(&stdin_buffer);
1374 buffer_init(&stdout_buffer);
1375 buffer_init(&stderr_buffer);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001376
Damien Millerb38eff82000-04-01 11:09:21 +10001377 client_init_dispatch();
1378
Ben Lindstromf49dbff2002-12-23 02:01:55 +00001379 /*
1380 * Set signal handlers, (e.g. to restore non-blocking mode)
1381 * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1382 */
Darren Tucker07336da2004-11-05 20:02:16 +11001383 if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1384 signal(SIGHUP, signal_handler);
Ben Lindstromf49dbff2002-12-23 02:01:55 +00001385 if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1386 signal(SIGINT, signal_handler);
1387 if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1388 signal(SIGQUIT, signal_handler);
1389 if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1390 signal(SIGTERM, signal_handler);
Darren Tucker5d78de62004-11-05 20:35:44 +11001391 signal(SIGWINCH, window_change_handler);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001392
Damien Miller95def091999-11-25 00:26:21 +11001393 if (have_pty)
1394 enter_raw_mode();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001395
Ben Lindstrom5b828322001-02-09 01:34:36 +00001396 if (compat20) {
1397 session_ident = ssh2_chan_id;
Ben Lindstrom2b1f71b2001-06-05 20:32:21 +00001398 if (escape_char != SSH_ESCAPECHAR_NONE)
Ben Lindstrom5b828322001-02-09 01:34:36 +00001399 channel_register_filter(session_ident,
Damien Miller077b2382005-12-31 16:22:32 +11001400 simple_escape_filter, NULL);
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001401 if (session_ident != -1)
1402 channel_register_cleanup(session_ident,
Damien Miller39eda6e2005-11-05 14:52:50 +11001403 client_channel_closed, 0);
Ben Lindstrom5b828322001-02-09 01:34:36 +00001404 } else {
1405 /* Check if we should immediately send eof on stdin. */
Damien Miller1383bd82000-04-06 12:32:37 +10001406 client_check_initial_eof_on_stdin();
Ben Lindstrom5b828322001-02-09 01:34:36 +00001407 }
Damien Millerad833b32000-08-23 10:46:23 +10001408
Damien Miller95def091999-11-25 00:26:21 +11001409 /* Main loop of the client for the interactive session mode. */
1410 while (!quit_pending) {
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001411
Damien Miller5428f641999-11-25 11:54:57 +11001412 /* Process buffered packets sent by the server. */
Damien Miller95def091999-11-25 00:26:21 +11001413 client_process_buffered_input_packets();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001414
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001415 if (compat20 && session_closed && !channel_still_open())
Damien Miller1383bd82000-04-06 12:32:37 +10001416 break;
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001417
1418 rekeying = (xxx_kex != NULL && !xxx_kex->done);
Damien Miller1383bd82000-04-06 12:32:37 +10001419
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001420 if (rekeying) {
1421 debug("rekeying in progress");
1422 } else {
1423 /*
1424 * Make packets of buffered stdin data, and buffer
1425 * them for sending to the server.
1426 */
1427 if (!compat20)
1428 client_make_packets_from_stdin_data();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001429
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001430 /*
1431 * Make packets from buffered channel data, and
1432 * enqueue them for sending to the server.
1433 */
1434 if (packet_not_very_much_data_to_write())
1435 channel_output_poll();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001436
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001437 /*
1438 * Check if the window size has changed, and buffer a
1439 * message about it to the server if so.
1440 */
1441 client_check_window_change();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001442
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001443 if (quit_pending)
1444 break;
1445 }
Damien Miller5428f641999-11-25 11:54:57 +11001446 /*
1447 * Wait until we have something to do (something becomes
1448 * available on one of the descriptors).
1449 */
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001450 max_fd2 = max_fd;
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001451 client_wait_until_can_do_something(&readset, &writeset,
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001452 &max_fd2, &nalloc, rekeying);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001453
Damien Miller95def091999-11-25 00:26:21 +11001454 if (quit_pending)
1455 break;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001456
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001457 /* Do channel operations unless rekeying in progress. */
1458 if (!rekeying) {
1459 channel_after_select(readset, writeset);
Damien Millera5539d22003-04-09 20:50:06 +10001460 if (need_rekeying || packet_need_rekeying()) {
1461 debug("need rekeying");
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001462 xxx_kex->done = 0;
1463 kex_send_kexinit(xxx_kex);
1464 need_rekeying = 0;
1465 }
1466 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001467
Damien Miller1383bd82000-04-06 12:32:37 +10001468 /* Buffer input from the connection. */
Damien Miller5e953212001-01-30 09:14:00 +11001469 client_process_net_input(readset);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001470
Damien Miller0e220db2004-06-15 10:34:08 +10001471 /* Accept control connections. */
1472 client_process_control(readset);
1473
Damien Miller1383bd82000-04-06 12:32:37 +10001474 if (quit_pending)
1475 break;
1476
1477 if (!compat20) {
1478 /* Buffer data from stdin */
Damien Miller5e953212001-01-30 09:14:00 +11001479 client_process_input(readset);
Damien Miller1383bd82000-04-06 12:32:37 +10001480 /*
1481 * Process output to stdout and stderr. Output to
1482 * the connection is processed elsewhere (above).
1483 */
Damien Miller5e953212001-01-30 09:14:00 +11001484 client_process_output(writeset);
Damien Miller1383bd82000-04-06 12:32:37 +10001485 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001486
Damien Miller5428f641999-11-25 11:54:57 +11001487 /* Send as much buffered packet data as possible to the sender. */
Damien Miller5e953212001-01-30 09:14:00 +11001488 if (FD_ISSET(connection_out, writeset))
Damien Miller95def091999-11-25 00:26:21 +11001489 packet_write_poll();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001490 }
Damien Miller5e953212001-01-30 09:14:00 +11001491 if (readset)
1492 xfree(readset);
1493 if (writeset)
1494 xfree(writeset);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001495
Damien Miller95def091999-11-25 00:26:21 +11001496 /* Terminate the session. */
1497
1498 /* Stop watching for window change. */
Darren Tucker5d78de62004-11-05 20:35:44 +11001499 signal(SIGWINCH, SIG_DFL);
Damien Miller95def091999-11-25 00:26:21 +11001500
Ben Lindstrom601e4362001-06-21 03:19:23 +00001501 channel_free_all();
Damien Miller95def091999-11-25 00:26:21 +11001502
Ben Lindstromec46e0b2001-06-09 01:27:31 +00001503 if (have_pty)
1504 leave_raw_mode();
Ben Lindstromc93e84c2001-05-12 00:08:37 +00001505
1506 /* restore blocking io */
1507 if (!isatty(fileno(stdin)))
1508 unset_nonblock(fileno(stdin));
1509 if (!isatty(fileno(stdout)))
1510 unset_nonblock(fileno(stdout));
1511 if (!isatty(fileno(stderr)))
1512 unset_nonblock(fileno(stderr));
1513
Damien Millerd6965512003-12-17 16:31:53 +11001514 /*
1515 * If there was no shell or command requested, there will be no remote
1516 * exit status to be returned. In that case, clear error code if the
1517 * connection was deliberately terminated at this end.
1518 */
1519 if (no_shell_flag && received_signal == SIGTERM) {
1520 received_signal = 0;
1521 exit_status = 0;
1522 }
1523
Darren Tucker9a2c4cd2003-09-22 21:16:05 +10001524 if (received_signal)
Ben Lindstromf8f065b2001-12-06 17:52:16 +00001525 fatal("Killed by signal %d.", (int) received_signal);
Ben Lindstromec46e0b2001-06-09 01:27:31 +00001526
1527 /*
1528 * In interactive mode (with pseudo tty) display a message indicating
1529 * that the connection has been closed.
1530 */
1531 if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1532 snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host);
1533 buffer_append(&stderr_buffer, buf, strlen(buf));
1534 }
1535
Damien Miller95def091999-11-25 00:26:21 +11001536 /* Output any buffered data for stdout. */
Ben Lindstromc93e84c2001-05-12 00:08:37 +00001537 while (buffer_len(&stdout_buffer) > 0) {
1538 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
Damien Miller037a0dc1999-12-07 15:38:31 +11001539 buffer_len(&stdout_buffer));
Ben Lindstromc93e84c2001-05-12 00:08:37 +00001540 if (len <= 0) {
Damien Miller95def091999-11-25 00:26:21 +11001541 error("Write failed flushing stdout buffer.");
Ben Lindstromc93e84c2001-05-12 00:08:37 +00001542 break;
1543 }
Damien Miller95def091999-11-25 00:26:21 +11001544 buffer_consume(&stdout_buffer, len);
Ben Lindstroma3700052001-04-05 23:26:32 +00001545 stdout_bytes += len;
Damien Miller95def091999-11-25 00:26:21 +11001546 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001547
Damien Miller95def091999-11-25 00:26:21 +11001548 /* Output any buffered data for stderr. */
Ben Lindstromc93e84c2001-05-12 00:08:37 +00001549 while (buffer_len(&stderr_buffer) > 0) {
1550 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
Damien Miller037a0dc1999-12-07 15:38:31 +11001551 buffer_len(&stderr_buffer));
Ben Lindstromc93e84c2001-05-12 00:08:37 +00001552 if (len <= 0) {
Damien Miller95def091999-11-25 00:26:21 +11001553 error("Write failed flushing stderr buffer.");
Ben Lindstromc93e84c2001-05-12 00:08:37 +00001554 break;
1555 }
Damien Miller95def091999-11-25 00:26:21 +11001556 buffer_consume(&stderr_buffer, len);
Ben Lindstroma3700052001-04-05 23:26:32 +00001557 stderr_bytes += len;
Damien Miller95def091999-11-25 00:26:21 +11001558 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001559
Damien Miller95def091999-11-25 00:26:21 +11001560 /* Clear and free any buffers. */
1561 memset(buf, 0, sizeof(buf));
1562 buffer_free(&stdin_buffer);
1563 buffer_free(&stdout_buffer);
1564 buffer_free(&stderr_buffer);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001565
Damien Miller95def091999-11-25 00:26:21 +11001566 /* Report bytes transferred, and transfer rates. */
1567 total_time = get_current_time() - start_time;
1568 debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds",
Damien Miller9f0f5c62001-12-21 14:45:46 +11001569 stdin_bytes, stdout_bytes, stderr_bytes, total_time);
Damien Miller95def091999-11-25 00:26:21 +11001570 if (total_time > 0)
1571 debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
Damien Miller9f0f5c62001-12-21 14:45:46 +11001572 stdin_bytes / total_time, stdout_bytes / total_time,
1573 stderr_bytes / total_time);
Damien Miller95def091999-11-25 00:26:21 +11001574
1575 /* Return the exit status of the program. */
1576 debug("Exit status %d", exit_status);
1577 return exit_status;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001578}
Damien Millerb38eff82000-04-01 11:09:21 +10001579
1580/*********/
1581
Ben Lindstrombba81212001-06-25 05:01:22 +00001582static void
Damien Miller630d6f42002-01-22 23:17:30 +11001583client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10001584{
Ben Lindstrom46c16222000-12-22 01:43:59 +00001585 u_int data_len;
Damien Millerb38eff82000-04-01 11:09:21 +10001586 char *data = packet_get_string(&data_len);
Damien Miller48b03fc2002-01-22 23:11:40 +11001587 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10001588 buffer_append(&stdout_buffer, data, data_len);
Damien Millerb38eff82000-04-01 11:09:21 +10001589 memset(data, 0, data_len);
1590 xfree(data);
1591}
Ben Lindstrombba81212001-06-25 05:01:22 +00001592static void
Damien Miller630d6f42002-01-22 23:17:30 +11001593client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10001594{
Ben Lindstrom46c16222000-12-22 01:43:59 +00001595 u_int data_len;
Damien Millerb38eff82000-04-01 11:09:21 +10001596 char *data = packet_get_string(&data_len);
Damien Miller48b03fc2002-01-22 23:11:40 +11001597 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10001598 buffer_append(&stderr_buffer, data, data_len);
Damien Millerb38eff82000-04-01 11:09:21 +10001599 memset(data, 0, data_len);
1600 xfree(data);
1601}
Ben Lindstrombba81212001-06-25 05:01:22 +00001602static void
Damien Miller630d6f42002-01-22 23:17:30 +11001603client_input_exit_status(int type, u_int32_t seq, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10001604{
Damien Millerb38eff82000-04-01 11:09:21 +10001605 exit_status = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11001606 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10001607 /* Acknowledge the exit. */
1608 packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1609 packet_send();
1610 /*
1611 * Must wait for packet to be sent since we are
1612 * exiting the loop.
1613 */
1614 packet_write_wait();
1615 /* Flag that we want to exit. */
1616 quit_pending = 1;
1617}
Darren Tucker5dcdd212003-10-02 16:17:00 +10001618static void
1619client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1620{
1621 Channel *c = NULL;
1622 int remote_id, sock;
1623
1624 /* Read the remote channel number from the message. */
1625 remote_id = packet_get_int();
1626 packet_check_eom();
1627
1628 /*
1629 * Get a connection to the local authentication agent (this may again
1630 * get forwarded).
1631 */
1632 sock = ssh_get_authentication_socket();
1633
1634 /*
1635 * If we could not connect the agent, send an error message back to
1636 * the server. This should never happen unless the agent dies,
1637 * because authentication forwarding is only enabled if we have an
1638 * agent.
1639 */
1640 if (sock >= 0) {
1641 c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1642 -1, 0, 0, 0, "authentication agent connection", 1);
1643 c->remote_id = remote_id;
1644 c->force_drain = 1;
1645 }
1646 if (c == NULL) {
1647 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1648 packet_put_int(remote_id);
1649 } else {
1650 /* Send a confirmation to the remote host. */
1651 debug("Forwarding authentication connection.");
1652 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1653 packet_put_int(remote_id);
1654 packet_put_int(c->self);
1655 }
1656 packet_send();
1657}
Damien Millerb38eff82000-04-01 11:09:21 +10001658
Ben Lindstrombba81212001-06-25 05:01:22 +00001659static Channel *
Damien Miller0bc1bd82000-11-13 22:57:25 +11001660client_request_forwarded_tcpip(const char *request_type, int rchan)
1661{
Ben Lindstroma962c2f2002-07-04 00:14:17 +00001662 Channel *c = NULL;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001663 char *listen_address, *originator_address;
1664 int listen_port, originator_port;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001665 int sock;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001666
1667 /* Get rest of the packet */
1668 listen_address = packet_get_string(NULL);
1669 listen_port = packet_get_int();
1670 originator_address = packet_get_string(NULL);
1671 originator_port = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11001672 packet_check_eom();
Damien Miller0bc1bd82000-11-13 22:57:25 +11001673
1674 debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d",
1675 listen_address, listen_port, originator_address, originator_port);
1676
Ben Lindstrom173e6462001-07-04 05:15:15 +00001677 sock = channel_connect_by_listen_address(listen_port);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001678 if (sock < 0) {
1679 xfree(originator_address);
1680 xfree(listen_address);
1681 return NULL;
1682 }
1683 c = channel_new("forwarded-tcpip",
1684 SSH_CHANNEL_CONNECTING, sock, sock, -1,
1685 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001686 originator_address, 1);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001687 xfree(originator_address);
1688 xfree(listen_address);
1689 return c;
1690}
1691
Ben Lindstroma962c2f2002-07-04 00:14:17 +00001692static Channel *
Damien Miller0bc1bd82000-11-13 22:57:25 +11001693client_request_x11(const char *request_type, int rchan)
1694{
1695 Channel *c = NULL;
1696 char *originator;
1697 int originator_port;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001698 int sock;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001699
1700 if (!options.forward_x11) {
1701 error("Warning: ssh server tried X11 forwarding.");
Damien Miller5eb137c2005-12-31 16:19:53 +11001702 error("Warning: this is probably a break-in attempt by a malicious server.");
Damien Miller0bc1bd82000-11-13 22:57:25 +11001703 return NULL;
1704 }
1705 originator = packet_get_string(NULL);
1706 if (datafellows & SSH_BUG_X11FWD) {
1707 debug2("buggy server: x11 request w/o originator_port");
1708 originator_port = 0;
1709 } else {
1710 originator_port = packet_get_int();
1711 }
Damien Miller48b03fc2002-01-22 23:11:40 +11001712 packet_check_eom();
Damien Miller0bc1bd82000-11-13 22:57:25 +11001713 /* XXX check permission */
Damien Millerd83ff352001-01-30 09:19:34 +11001714 debug("client_request_x11: request from %s %d", originator,
1715 originator_port);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001716 xfree(originator);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001717 sock = x11_connect_display();
1718 if (sock < 0)
1719 return NULL;
1720 c = channel_new("x11",
1721 SSH_CHANNEL_X11_OPEN, sock, sock, -1,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001722 CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
Ben Lindstrom944c4f02001-09-18 05:51:13 +00001723 c->force_drain = 1;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001724 return c;
1725}
1726
Ben Lindstroma962c2f2002-07-04 00:14:17 +00001727static Channel *
Damien Miller0bc1bd82000-11-13 22:57:25 +11001728client_request_agent(const char *request_type, int rchan)
1729{
1730 Channel *c = NULL;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001731 int sock;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001732
1733 if (!options.forward_agent) {
1734 error("Warning: ssh server tried agent forwarding.");
Damien Miller5eb137c2005-12-31 16:19:53 +11001735 error("Warning: this is probably a break-in attempt by a malicious server.");
Damien Miller0bc1bd82000-11-13 22:57:25 +11001736 return NULL;
1737 }
1738 sock = ssh_get_authentication_socket();
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001739 if (sock < 0)
1740 return NULL;
1741 c = channel_new("authentication agent connection",
1742 SSH_CHANNEL_OPEN, sock, sock, -1,
1743 CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001744 "authentication agent connection", 1);
Ben Lindstrom944c4f02001-09-18 05:51:13 +00001745 c->force_drain = 1;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001746 return c;
1747}
1748
Damien Millerbd483e72000-04-30 10:00:53 +10001749/* XXXX move to generic input handler */
Ben Lindstrombba81212001-06-25 05:01:22 +00001750static void
Damien Miller630d6f42002-01-22 23:17:30 +11001751client_input_channel_open(int type, u_int32_t seq, void *ctxt)
Damien Millerbd483e72000-04-30 10:00:53 +10001752{
1753 Channel *c = NULL;
1754 char *ctype;
Damien Millerbd483e72000-04-30 10:00:53 +10001755 int rchan;
Ben Lindstrom4fed2be2002-06-25 23:17:36 +00001756 u_int rmaxpack, rwindow, len;
Damien Millerbd483e72000-04-30 10:00:53 +10001757
1758 ctype = packet_get_string(&len);
1759 rchan = packet_get_int();
1760 rwindow = packet_get_int();
1761 rmaxpack = packet_get_int();
1762
Damien Millere247cc42000-05-07 12:03:14 +10001763 debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
Damien Millerbd483e72000-04-30 10:00:53 +10001764 ctype, rchan, rwindow, rmaxpack);
1765
Damien Miller0bc1bd82000-11-13 22:57:25 +11001766 if (strcmp(ctype, "forwarded-tcpip") == 0) {
1767 c = client_request_forwarded_tcpip(ctype, rchan);
1768 } else if (strcmp(ctype, "x11") == 0) {
1769 c = client_request_x11(ctype, rchan);
1770 } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1771 c = client_request_agent(ctype, rchan);
Damien Millerbd483e72000-04-30 10:00:53 +10001772 }
1773/* XXX duplicate : */
1774 if (c != NULL) {
1775 debug("confirm %s", ctype);
1776 c->remote_id = rchan;
1777 c->remote_window = rwindow;
1778 c->remote_maxpacket = rmaxpack;
Ben Lindstroma69d89b2001-05-09 00:01:18 +00001779 if (c->type != SSH_CHANNEL_CONNECTING) {
1780 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1781 packet_put_int(c->remote_id);
1782 packet_put_int(c->self);
1783 packet_put_int(c->local_window);
1784 packet_put_int(c->local_maxpacket);
1785 packet_send();
1786 }
Damien Millerbd483e72000-04-30 10:00:53 +10001787 } else {
1788 debug("failure %s", ctype);
1789 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1790 packet_put_int(rchan);
1791 packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
Ben Lindstromf3436742001-04-29 19:52:00 +00001792 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
Ben Lindstroma69d89b2001-05-09 00:01:18 +00001793 packet_put_cstring("open failed");
Ben Lindstromf3436742001-04-29 19:52:00 +00001794 packet_put_cstring("");
1795 }
Damien Millerbd483e72000-04-30 10:00:53 +10001796 packet_send();
1797 }
1798 xfree(ctype);
1799}
Ben Lindstrombba81212001-06-25 05:01:22 +00001800static void
Damien Miller630d6f42002-01-22 23:17:30 +11001801client_input_channel_req(int type, u_int32_t seq, void *ctxt)
Ben Lindstrom5b828322001-02-09 01:34:36 +00001802{
1803 Channel *c = NULL;
Damien Miller0e220db2004-06-15 10:34:08 +10001804 int exitval, id, reply, success = 0;
Ben Lindstrom5b828322001-02-09 01:34:36 +00001805 char *rtype;
1806
1807 id = packet_get_int();
1808 rtype = packet_get_string(NULL);
1809 reply = packet_get_char();
1810
1811 debug("client_input_channel_req: channel %d rtype %s reply %d",
1812 id, rtype, reply);
1813
Damien Miller3bbd8782004-06-18 22:23:22 +10001814 if (id == -1) {
1815 error("client_input_channel_req: request for channel -1");
1816 } else if ((c = channel_lookup(id)) == NULL) {
Ben Lindstrom5b828322001-02-09 01:34:36 +00001817 error("client_input_channel_req: channel %d: unknown channel", id);
1818 } else if (strcmp(rtype, "exit-status") == 0) {
Damien Miller0e220db2004-06-15 10:34:08 +10001819 exitval = packet_get_int();
1820 if (id == session_ident) {
1821 success = 1;
1822 exit_status = exitval;
1823 } else if (c->ctl_fd == -1) {
1824 error("client_input_channel_req: unexpected channel %d",
1825 session_ident);
1826 } else {
1827 atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1828 success = 1;
1829 }
Damien Miller48b03fc2002-01-22 23:11:40 +11001830 packet_check_eom();
Ben Lindstrom5b828322001-02-09 01:34:36 +00001831 }
1832 if (reply) {
1833 packet_start(success ?
1834 SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
Damien Miller3bbd8782004-06-18 22:23:22 +10001835 packet_put_int(id);
Ben Lindstrom5b828322001-02-09 01:34:36 +00001836 packet_send();
1837 }
1838 xfree(rtype);
1839}
Damien Millerc3fa4072002-01-22 23:21:58 +11001840static void
1841client_input_global_request(int type, u_int32_t seq, void *ctxt)
1842{
1843 char *rtype;
1844 int want_reply;
1845 int success = 0;
1846
1847 rtype = packet_get_string(NULL);
1848 want_reply = packet_get_char();
Damien Miller509b0102003-12-17 16:33:10 +11001849 debug("client_input_global_request: rtype %s want_reply %d",
1850 rtype, want_reply);
Damien Millerc3fa4072002-01-22 23:21:58 +11001851 if (want_reply) {
1852 packet_start(success ?
1853 SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1854 packet_send();
1855 packet_write_wait();
1856 }
1857 xfree(rtype);
1858}
Damien Millerbd483e72000-04-30 10:00:53 +10001859
Damien Miller0e220db2004-06-15 10:34:08 +10001860void
Darren Tuckerfc959702004-07-17 16:12:08 +10001861client_session2_setup(int id, int want_tty, int want_subsystem,
Damien Miller3756dce2004-06-18 01:17:29 +10001862 const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env,
Damien Miller0e220db2004-06-15 10:34:08 +10001863 dispatch_fn *subsys_repl)
1864{
1865 int len;
Darren Tucker5d78de62004-11-05 20:35:44 +11001866 Channel *c = NULL;
Damien Miller0e220db2004-06-15 10:34:08 +10001867
1868 debug2("%s: id %d", __func__, id);
1869
Darren Tucker5d78de62004-11-05 20:35:44 +11001870 if ((c = channel_lookup(id)) == NULL)
1871 fatal("client_session2_setup: channel %d: unknown channel", id);
1872
Damien Miller0e220db2004-06-15 10:34:08 +10001873 if (want_tty) {
1874 struct winsize ws;
1875 struct termios tio;
1876
1877 /* Store window size in the packet. */
1878 if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1879 memset(&ws, 0, sizeof(ws));
1880
1881 channel_request_start(id, "pty-req", 0);
1882 packet_put_cstring(term != NULL ? term : "");
1883 packet_put_int(ws.ws_col);
1884 packet_put_int(ws.ws_row);
1885 packet_put_int(ws.ws_xpixel);
1886 packet_put_int(ws.ws_ypixel);
1887 tio = get_saved_tio();
1888 tty_make_modes(-1, tiop != NULL ? tiop : &tio);
1889 packet_send();
1890 /* XXX wait for reply */
Darren Tucker5d78de62004-11-05 20:35:44 +11001891 c->client_tty = 1;
Damien Miller0e220db2004-06-15 10:34:08 +10001892 }
1893
1894 /* Transfer any environment variables from client to server */
Damien Miller3756dce2004-06-18 01:17:29 +10001895 if (options.num_send_env != 0 && env != NULL) {
Damien Miller0e220db2004-06-15 10:34:08 +10001896 int i, j, matched;
Damien Miller0e220db2004-06-15 10:34:08 +10001897 char *name, *val;
1898
1899 debug("Sending environment.");
Damien Miller3756dce2004-06-18 01:17:29 +10001900 for (i = 0; env[i] != NULL; i++) {
Damien Miller0e220db2004-06-15 10:34:08 +10001901 /* Split */
Damien Miller3756dce2004-06-18 01:17:29 +10001902 name = xstrdup(env[i]);
Damien Miller0e220db2004-06-15 10:34:08 +10001903 if ((val = strchr(name, '=')) == NULL) {
Damien Miller0a0176e2005-11-05 15:07:59 +11001904 xfree(name);
Damien Miller0e220db2004-06-15 10:34:08 +10001905 continue;
1906 }
1907 *val++ = '\0';
1908
1909 matched = 0;
1910 for (j = 0; j < options.num_send_env; j++) {
1911 if (match_pattern(name, options.send_env[j])) {
1912 matched = 1;
1913 break;
1914 }
1915 }
1916 if (!matched) {
1917 debug3("Ignored env %s", name);
Damien Miller0a0176e2005-11-05 15:07:59 +11001918 xfree(name);
Damien Miller0e220db2004-06-15 10:34:08 +10001919 continue;
1920 }
1921
1922 debug("Sending env %s = %s", name, val);
1923 channel_request_start(id, "env", 0);
1924 packet_put_cstring(name);
1925 packet_put_cstring(val);
1926 packet_send();
Damien Miller0a0176e2005-11-05 15:07:59 +11001927 xfree(name);
Damien Miller0e220db2004-06-15 10:34:08 +10001928 }
1929 }
1930
1931 len = buffer_len(cmd);
1932 if (len > 0) {
1933 if (len > 900)
1934 len = 900;
1935 if (want_subsystem) {
1936 debug("Sending subsystem: %.*s", len, (u_char*)buffer_ptr(cmd));
1937 channel_request_start(id, "subsystem", subsys_repl != NULL);
1938 if (subsys_repl != NULL) {
1939 /* register callback for reply */
1940 /* XXX we assume that client_loop has already been called */
1941 dispatch_set(SSH2_MSG_CHANNEL_FAILURE, subsys_repl);
1942 dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, subsys_repl);
1943 }
1944 } else {
1945 debug("Sending command: %.*s", len, (u_char*)buffer_ptr(cmd));
1946 channel_request_start(id, "exec", 0);
1947 }
1948 packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
1949 packet_send();
1950 } else {
1951 channel_request_start(id, "shell", 0);
1952 packet_send();
1953 }
1954}
1955
Ben Lindstrombba81212001-06-25 05:01:22 +00001956static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00001957client_init_dispatch_20(void)
Damien Miller1383bd82000-04-06 12:32:37 +10001958{
Ben Lindstrom8ac91062001-04-04 17:57:54 +00001959 dispatch_init(&dispatch_protocol_error);
Damien Miller2797f7f2002-04-23 21:09:44 +10001960
Damien Miller1383bd82000-04-06 12:32:37 +10001961 dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1962 dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1963 dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1964 dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
Damien Millerbd483e72000-04-30 10:00:53 +10001965 dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
Damien Miller1383bd82000-04-06 12:32:37 +10001966 dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1967 dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
Ben Lindstrom5b828322001-02-09 01:34:36 +00001968 dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
Damien Miller1383bd82000-04-06 12:32:37 +10001969 dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
Damien Millerc3fa4072002-01-22 23:21:58 +11001970 dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
Ben Lindstrom8ac91062001-04-04 17:57:54 +00001971
1972 /* rekeying */
1973 dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
Damien Miller2797f7f2002-04-23 21:09:44 +10001974
1975 /* global request reply messages */
1976 dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
1977 dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
Damien Miller1383bd82000-04-06 12:32:37 +10001978}
Ben Lindstrombba81212001-06-25 05:01:22 +00001979static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00001980client_init_dispatch_13(void)
Damien Millerb38eff82000-04-01 11:09:21 +10001981{
1982 dispatch_init(NULL);
1983 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
1984 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
1985 dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
Damien Millerb38eff82000-04-01 11:09:21 +10001986 dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1987 dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1988 dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
Damien Millerb38eff82000-04-01 11:09:21 +10001989 dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
1990 dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
1991 dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
Damien Miller69b69aa2000-10-28 14:19:58 +11001992
1993 dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
Darren Tucker5dcdd212003-10-02 16:17:00 +10001994 &client_input_agent_open : &deny_input_open);
Damien Miller69b69aa2000-10-28 14:19:58 +11001995 dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
1996 &x11_input_open : &deny_input_open);
Damien Millerb38eff82000-04-01 11:09:21 +10001997}
Ben Lindstrombba81212001-06-25 05:01:22 +00001998static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00001999client_init_dispatch_15(void)
Damien Millerb38eff82000-04-01 11:09:21 +10002000{
2001 client_init_dispatch_13();
2002 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2003 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2004}
Ben Lindstromdb47f382001-07-04 05:10:27 +00002005static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00002006client_init_dispatch(void)
Damien Millerb38eff82000-04-01 11:09:21 +10002007{
Damien Miller1383bd82000-04-06 12:32:37 +10002008 if (compat20)
2009 client_init_dispatch_20();
2010 else if (compat13)
Damien Millerb38eff82000-04-01 11:09:21 +10002011 client_init_dispatch_13();
2012 else
2013 client_init_dispatch_15();
2014}
Darren Tucker9a2c4cd2003-09-22 21:16:05 +10002015
2016/* client specific fatal cleanup */
2017void
Darren Tucker3e33cec2003-10-02 16:12:36 +10002018cleanup_exit(int i)
Darren Tucker9a2c4cd2003-09-22 21:16:05 +10002019{
Darren Tucker9a2c4cd2003-09-22 21:16:05 +10002020 leave_raw_mode();
2021 leave_non_blocking();
Damien Miller0e220db2004-06-15 10:34:08 +10002022 if (options.control_path != NULL && control_fd != -1)
2023 unlink(options.control_path);
Darren Tucker3e33cec2003-10-02 16:12:36 +10002024 _exit(i);
Darren Tucker9a2c4cd2003-09-22 21:16:05 +10002025}