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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 Miller17e91c02006-03-15 11:28:34 +110062
Damien Millerf17883e2006-03-15 11:45:54 +110063#include <sys/types.h>
64#ifdef HAVE_SYS_STAT_H
65# include <sys/stat.h>
66#endif
Damien Miller17e91c02006-03-15 11:28:34 +110067#include <sys/ioctl.h>
Damien Miller99bd21e2006-03-15 11:11:28 +110068
Damien Millerc7b06362006-03-15 11:53:45 +110069#include <ctype.h>
Damien Miller6645e7a2006-03-15 14:42:54 +110070#ifdef HAVE_PATHS_H
Damien Miller03e20032006-03-15 11:16:59 +110071#include <paths.h>
Damien Miller6645e7a2006-03-15 14:42:54 +110072#endif
Damien Miller6ff3cad2006-03-15 11:52:09 +110073#include <signal.h>
Damien Miller99bd21e2006-03-15 11:11:28 +110074#include <termios.h>
Damien Millerd4a8b7e1999-10-27 13:42:43 +100075
Damien Millerd4a8b7e1999-10-27 13:42:43 +100076#include "ssh.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000077#include "ssh1.h"
78#include "ssh2.h"
79#include "xmalloc.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100080#include "packet.h"
81#include "buffer.h"
Damien Millerb38eff82000-04-01 11:09:21 +100082#include "compat.h"
Ben Lindstromc7637672001-06-09 00:36:26 +000083#include "channels.h"
Damien Millerb38eff82000-04-01 11:09:21 +100084#include "dispatch.h"
Damien Millerad833b32000-08-23 10:46:23 +100085#include "buffer.h"
86#include "bufaux.h"
Damien Miller0bc1bd82000-11-13 22:57:25 +110087#include "key.h"
Ben Lindstromf28f6342001-04-04 02:03:04 +000088#include "kex.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000089#include "log.h"
90#include "readconf.h"
Ben Lindstrombf555ba2001-01-18 02:04:35 +000091#include "clientloop.h"
Damien Milleraeb31d62005-12-13 19:29:36 +110092#include "sshconnect.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000093#include "authfd.h"
94#include "atomicio.h"
Darren Tucker06f2bd82004-05-13 16:06:46 +100095#include "sshpty.h"
Ben Lindstrom302ea6f2001-04-16 02:01:25 +000096#include "misc.h"
Damien Miller0e220db2004-06-15 10:34:08 +100097#include "monitor_fdpass.h"
98#include "match.h"
99#include "msg.h"
Damien Miller69b69aa2000-10-28 14:19:58 +1100100
101/* import options */
102extern Options options;
103
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000104/* Flag indicating that stdin should be redirected from /dev/null. */
105extern int stdin_null_flag;
106
Damien Millerd6965512003-12-17 16:31:53 +1100107/* Flag indicating that no shell has been requested */
108extern int no_shell_flag;
109
Damien Miller0e220db2004-06-15 10:34:08 +1000110/* Control socket */
111extern int control_fd;
112
Damien Miller5428f641999-11-25 11:54:57 +1100113/*
114 * Name of the host we are connecting to. This is the name given on the
115 * command line, or the HostName specified for the user-supplied name in a
116 * configuration file.
117 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000118extern char *host;
119
Damien Miller5428f641999-11-25 11:54:57 +1100120/*
121 * Flag to indicate that we have received a window change signal which has
122 * not yet been processed. This will cause a message indicating the new
123 * window size to be sent to the server a little later. This is volatile
124 * because this is updated in a signal handler.
125 */
Ben Lindstrom5e71c542001-12-06 16:48:14 +0000126static volatile sig_atomic_t received_window_change_signal = 0;
127static volatile sig_atomic_t received_signal = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000128
Damien Miller788f2122005-11-05 15:14:59 +1100129/* Flag indicating whether the user's terminal is in non-blocking mode. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000130static int in_non_blocking_mode = 0;
131
132/* Common data for the client loop code. */
Damien Millerad833b32000-08-23 10:46:23 +1000133static int quit_pending; /* Set to non-zero to quit the client loop. */
134static int escape_char; /* Escape character. */
Damien Miller95def091999-11-25 00:26:21 +1100135static int escape_pending; /* Last character was the escape character */
136static int last_was_cr; /* Last character was a newline. */
137static int exit_status; /* Used to store the exit status of the command. */
138static int stdin_eof; /* EOF has been encountered on standard error. */
139static Buffer stdin_buffer; /* Buffer for stdin data. */
140static Buffer stdout_buffer; /* Buffer for stdout data. */
141static Buffer stderr_buffer; /* Buffer for stderr data. */
Ben Lindstrom46c16222000-12-22 01:43:59 +0000142static u_long stdin_bytes, stdout_bytes, stderr_bytes;
143static u_int buffer_high;/* Soft max buffer size. */
Damien Miller95def091999-11-25 00:26:21 +1100144static int connection_in; /* Connection to server (input). */
145static int connection_out; /* Connection to server (output). */
Ben Lindstrombe2cc432001-04-04 23:46:07 +0000146static int need_rekeying; /* Set to non-zero if rekeying is requested. */
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +0000147static int session_closed = 0; /* In SSH2: login session closed. */
Damien Miller509b0102003-12-17 16:33:10 +1100148static int server_alive_timeouts = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000149
Ben Lindstrombba81212001-06-25 05:01:22 +0000150static void client_init_dispatch(void);
Damien Miller1383bd82000-04-06 12:32:37 +1000151int session_ident = -1;
152
Damien Miller0e220db2004-06-15 10:34:08 +1000153struct confirm_ctx {
154 int want_tty;
155 int want_subsys;
Damien Miller13390022005-07-06 09:44:19 +1000156 int want_x_fwd;
157 int want_agent_fwd;
Damien Miller0e220db2004-06-15 10:34:08 +1000158 Buffer cmd;
159 char *term;
160 struct termios tio;
Damien Miller3756dce2004-06-18 01:17:29 +1000161 char **env;
Damien Miller0e220db2004-06-15 10:34:08 +1000162};
163
Ben Lindstromf28f6342001-04-04 02:03:04 +0000164/*XXX*/
165extern Kex *xxx_kex;
166
Damien Miller0e220db2004-06-15 10:34:08 +1000167void ssh_process_session2_setup(int, int, int, Buffer *);
168
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000169/* Restores stdin to blocking mode. */
170
Ben Lindstrombba81212001-06-25 05:01:22 +0000171static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000172leave_non_blocking(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000173{
Damien Miller95def091999-11-25 00:26:21 +1100174 if (in_non_blocking_mode) {
Damien Miller03e66f62004-06-15 15:47:51 +1000175 unset_nonblock(fileno(stdin));
Damien Miller95def091999-11-25 00:26:21 +1100176 in_non_blocking_mode = 0;
Damien Miller95def091999-11-25 00:26:21 +1100177 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000178}
179
Damien Miller95def091999-11-25 00:26:21 +1100180/* Puts stdin terminal in non-blocking mode. */
181
Ben Lindstrombba81212001-06-25 05:01:22 +0000182static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000183enter_non_blocking(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000184{
Damien Miller95def091999-11-25 00:26:21 +1100185 in_non_blocking_mode = 1;
Damien Miller232711f2004-06-15 10:35:30 +1000186 set_nonblock(fileno(stdin));
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000187}
188
Damien Miller5428f641999-11-25 11:54:57 +1100189/*
190 * Signal handler for the window change signal (SIGWINCH). This just sets a
191 * flag indicating that the window has changed.
192 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000193
Ben Lindstrombba81212001-06-25 05:01:22 +0000194static void
Damien Miller95def091999-11-25 00:26:21 +1100195window_change_handler(int sig)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000196{
Damien Miller95def091999-11-25 00:26:21 +1100197 received_window_change_signal = 1;
198 signal(SIGWINCH, window_change_handler);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000199}
200
Damien Miller5428f641999-11-25 11:54:57 +1100201/*
202 * Signal handler for signals that cause the program to terminate. These
203 * signals must be trapped to restore terminal modes.
204 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000205
Ben Lindstrombba81212001-06-25 05:01:22 +0000206static void
Damien Miller95def091999-11-25 00:26:21 +1100207signal_handler(int sig)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000208{
Ben Lindstromec46e0b2001-06-09 01:27:31 +0000209 received_signal = sig;
210 quit_pending = 1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000211}
212
Damien Miller5428f641999-11-25 11:54:57 +1100213/*
214 * Returns current time in seconds from Jan 1, 1970 with the maximum
215 * available resolution.
216 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000217
Ben Lindstrombba81212001-06-25 05:01:22 +0000218static double
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000219get_current_time(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000220{
Damien Miller95def091999-11-25 00:26:21 +1100221 struct timeval tv;
222 gettimeofday(&tv, NULL);
223 return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000224}
225
Damien Miller17e7ed02005-06-17 12:54:33 +1000226#define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
227void
228client_x11_get_proto(const char *display, const char *xauth_path,
229 u_int trusted, char **_proto, char **_data)
230{
231 char cmd[1024];
232 char line[512];
233 char xdisplay[512];
234 static char proto[512], data[512];
235 FILE *f;
236 int got_data = 0, generated = 0, do_unlink = 0, i;
237 char *xauthdir, *xauthfile;
238 struct stat st;
239
240 xauthdir = xauthfile = NULL;
241 *_proto = proto;
242 *_data = data;
243 proto[0] = data[0] = '\0';
244
245 if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
246 debug("No xauth program.");
247 } else {
248 if (display == NULL) {
249 debug("x11_get_proto: DISPLAY not set");
250 return;
251 }
252 /*
253 * Handle FamilyLocal case where $DISPLAY does
254 * not match an authorization entry. For this we
255 * just try "xauth list unix:displaynum.screennum".
256 * XXX: "localhost" match to determine FamilyLocal
257 * is not perfect.
258 */
259 if (strncmp(display, "localhost:", 10) == 0) {
260 snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
261 display + 10);
262 display = xdisplay;
263 }
264 if (trusted == 0) {
265 xauthdir = xmalloc(MAXPATHLEN);
266 xauthfile = xmalloc(MAXPATHLEN);
267 strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
268 if (mkdtemp(xauthdir) != NULL) {
269 do_unlink = 1;
270 snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
271 xauthdir);
272 snprintf(cmd, sizeof(cmd),
273 "%s -f %s generate %s " SSH_X11_PROTO
274 " untrusted timeout 1200 2>" _PATH_DEVNULL,
275 xauth_path, xauthfile, display);
276 debug2("x11_get_proto: %s", cmd);
277 if (system(cmd) == 0)
278 generated = 1;
279 }
280 }
281 snprintf(cmd, sizeof(cmd),
Darren Tuckerd89dbf22005-10-03 18:05:26 +1000282 "%s %s%s list %s 2>" _PATH_DEVNULL,
Damien Miller17e7ed02005-06-17 12:54:33 +1000283 xauth_path,
284 generated ? "-f " : "" ,
285 generated ? xauthfile : "",
286 display);
287 debug2("x11_get_proto: %s", cmd);
288 f = popen(cmd, "r");
289 if (f && fgets(line, sizeof(line), f) &&
290 sscanf(line, "%*s %511s %511s", proto, data) == 2)
291 got_data = 1;
292 if (f)
293 pclose(f);
294 }
295
296 if (do_unlink) {
297 unlink(xauthfile);
298 rmdir(xauthdir);
299 }
300 if (xauthdir)
301 xfree(xauthdir);
302 if (xauthfile)
303 xfree(xauthfile);
304
305 /*
306 * If we didn't get authentication data, just make up some
307 * data. The forwarding code will check the validity of the
308 * response anyway, and substitute this data. The X11
309 * server, however, will ignore this fake data and use
310 * whatever authentication mechanisms it was using otherwise
311 * for the local connection.
312 */
313 if (!got_data) {
314 u_int32_t rnd = 0;
315
316 logit("Warning: No xauth data; "
317 "using fake authentication data for X11 forwarding.");
318 strlcpy(proto, SSH_X11_PROTO, sizeof proto);
319 for (i = 0; i < 16; i++) {
320 if (i % 4 == 0)
321 rnd = arc4random();
322 snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
323 rnd & 0xff);
324 rnd >>= 8;
325 }
326 }
327}
328
Damien Miller5428f641999-11-25 11:54:57 +1100329/*
330 * This is called when the interactive is entered. This checks if there is
331 * an EOF coming on stdin. We must check this explicitly, as select() does
332 * not appear to wake up when redirecting from /dev/null.
333 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000334
Ben Lindstrombba81212001-06-25 05:01:22 +0000335static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000336client_check_initial_eof_on_stdin(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000337{
Damien Miller95def091999-11-25 00:26:21 +1100338 int len;
339 char buf[1];
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000340
Damien Miller5428f641999-11-25 11:54:57 +1100341 /*
342 * If standard input is to be "redirected from /dev/null", we simply
343 * mark that we have seen an EOF and send an EOF message to the
344 * server. Otherwise, we try to read a single character; it appears
345 * that for some files, such /dev/null, select() never wakes up for
346 * read for this descriptor, which means that we never get EOF. This
347 * way we will get the EOF if stdin comes from /dev/null or similar.
348 */
Damien Miller95def091999-11-25 00:26:21 +1100349 if (stdin_null_flag) {
350 /* Fake EOF on stdin. */
351 debug("Sending eof.");
352 stdin_eof = 1;
353 packet_start(SSH_CMSG_EOF);
354 packet_send();
355 } else {
Damien Miller95def091999-11-25 00:26:21 +1100356 enter_non_blocking();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000357
Damien Miller95def091999-11-25 00:26:21 +1100358 /* Check for immediate EOF on stdin. */
359 len = read(fileno(stdin), buf, 1);
360 if (len == 0) {
Damien Miller5428f641999-11-25 11:54:57 +1100361 /* EOF. Record that we have seen it and send EOF to server. */
Damien Miller95def091999-11-25 00:26:21 +1100362 debug("Sending eof.");
363 stdin_eof = 1;
364 packet_start(SSH_CMSG_EOF);
365 packet_send();
366 } else if (len > 0) {
Damien Miller5428f641999-11-25 11:54:57 +1100367 /*
368 * Got data. We must store the data in the buffer,
369 * and also process it as an escape character if
370 * appropriate.
371 */
Ben Lindstrom46c16222000-12-22 01:43:59 +0000372 if ((u_char) buf[0] == escape_char)
Damien Miller95def091999-11-25 00:26:21 +1100373 escape_pending = 1;
Ben Lindstrome9613cf2001-03-05 06:14:02 +0000374 else
Damien Miller95def091999-11-25 00:26:21 +1100375 buffer_append(&stdin_buffer, buf, 1);
Damien Miller95def091999-11-25 00:26:21 +1100376 }
Damien Miller95def091999-11-25 00:26:21 +1100377 leave_non_blocking();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000378 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000379}
380
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000381
Damien Miller5428f641999-11-25 11:54:57 +1100382/*
383 * Make packets from buffered stdin data, and buffer them for sending to the
384 * connection.
385 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000386
Ben Lindstrombba81212001-06-25 05:01:22 +0000387static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000388client_make_packets_from_stdin_data(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000389{
Ben Lindstrom46c16222000-12-22 01:43:59 +0000390 u_int len;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000391
Damien Miller95def091999-11-25 00:26:21 +1100392 /* Send buffered stdin data to the server. */
393 while (buffer_len(&stdin_buffer) > 0 &&
Damien Miller9f0f5c62001-12-21 14:45:46 +1100394 packet_not_very_much_data_to_write()) {
Damien Miller95def091999-11-25 00:26:21 +1100395 len = buffer_len(&stdin_buffer);
396 /* Keep the packets at reasonable size. */
397 if (len > packet_get_maxsize())
398 len = packet_get_maxsize();
399 packet_start(SSH_CMSG_STDIN_DATA);
400 packet_put_string(buffer_ptr(&stdin_buffer), len);
401 packet_send();
402 buffer_consume(&stdin_buffer, len);
Ben Lindstrome9613cf2001-03-05 06:14:02 +0000403 stdin_bytes += len;
Damien Miller95def091999-11-25 00:26:21 +1100404 /* If we have a pending EOF, send it now. */
405 if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
406 packet_start(SSH_CMSG_EOF);
407 packet_send();
408 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000409 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000410}
411
Damien Miller5428f641999-11-25 11:54:57 +1100412/*
413 * Checks if the client window has changed, and sends a packet about it to
414 * the server if so. The actual change is detected elsewhere (by a software
415 * interrupt on Unix); this just checks the flag and sends a message if
416 * appropriate.
417 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000418
Ben Lindstrombba81212001-06-25 05:01:22 +0000419static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000420client_check_window_change(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000421{
Damien Miller1383bd82000-04-06 12:32:37 +1000422 struct winsize ws;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000423
Damien Miller1383bd82000-04-06 12:32:37 +1000424 if (! received_window_change_signal)
425 return;
426 /** XXX race */
427 received_window_change_signal = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000428
Damien Millerd3444942000-09-30 14:20:03 +1100429 debug2("client_check_window_change: changed");
Damien Miller1383bd82000-04-06 12:32:37 +1000430
431 if (compat20) {
Damien Miller0e220db2004-06-15 10:34:08 +1000432 channel_send_window_changes();
Damien Miller1383bd82000-04-06 12:32:37 +1000433 } else {
Damien Miller0e220db2004-06-15 10:34:08 +1000434 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
435 return;
Damien Miller1383bd82000-04-06 12:32:37 +1000436 packet_start(SSH_CMSG_WINDOW_SIZE);
437 packet_put_int(ws.ws_row);
438 packet_put_int(ws.ws_col);
439 packet_put_int(ws.ws_xpixel);
440 packet_put_int(ws.ws_ypixel);
441 packet_send();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000442 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000443}
444
Damien Miller509b0102003-12-17 16:33:10 +1100445static void
446client_global_request_reply(int type, u_int32_t seq, void *ctxt)
447{
448 server_alive_timeouts = 0;
449 client_global_request_reply_fwd(type, seq, ctxt);
450}
451
452static void
453server_alive_check(void)
454{
455 if (++server_alive_timeouts > options.server_alive_count_max)
456 packet_disconnect("Timeout, server not responding.");
457 packet_start(SSH2_MSG_GLOBAL_REQUEST);
458 packet_put_cstring("keepalive@openssh.com");
459 packet_put_char(1); /* boolean: want reply */
460 packet_send();
461}
462
Damien Miller5428f641999-11-25 11:54:57 +1100463/*
464 * Waits until the client can do something (some data becomes available on
465 * one of the file descriptors).
466 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000467static void
Damien Miller5e953212001-01-30 09:14:00 +1100468client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000469 int *maxfdp, u_int *nallocp, int rekeying)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000470{
Damien Miller509b0102003-12-17 16:33:10 +1100471 struct timeval tv, *tvp;
472 int ret;
473
Damien Miller5e953212001-01-30 09:14:00 +1100474 /* Add any selections by the channel mechanism. */
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000475 channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000476
Damien Miller1383bd82000-04-06 12:32:37 +1000477 if (!compat20) {
478 /* Read from the connection, unless our buffers are full. */
479 if (buffer_len(&stdout_buffer) < buffer_high &&
480 buffer_len(&stderr_buffer) < buffer_high &&
481 channel_not_very_much_buffered_data())
Damien Miller5e953212001-01-30 09:14:00 +1100482 FD_SET(connection_in, *readsetp);
Damien Miller1383bd82000-04-06 12:32:37 +1000483 /*
484 * Read from stdin, unless we have seen EOF or have very much
485 * buffered data to send to the server.
486 */
487 if (!stdin_eof && packet_not_very_much_data_to_write())
Damien Miller5e953212001-01-30 09:14:00 +1100488 FD_SET(fileno(stdin), *readsetp);
Damien Miller1383bd82000-04-06 12:32:37 +1000489
490 /* Select stdout/stderr if have data in buffer. */
491 if (buffer_len(&stdout_buffer) > 0)
Damien Miller5e953212001-01-30 09:14:00 +1100492 FD_SET(fileno(stdout), *writesetp);
Damien Miller1383bd82000-04-06 12:32:37 +1000493 if (buffer_len(&stderr_buffer) > 0)
Damien Miller5e953212001-01-30 09:14:00 +1100494 FD_SET(fileno(stderr), *writesetp);
Damien Miller1383bd82000-04-06 12:32:37 +1000495 } else {
Ben Lindstromc8b3f472001-05-17 03:19:40 +0000496 /* channel_prepare_select could have closed the last channel */
Damien Miller164a7f42001-10-12 11:36:09 +1000497 if (session_closed && !channel_still_open() &&
498 !packet_have_data_to_write()) {
499 /* clear mask since we did not call select() */
Damien Miller79faeff2001-11-12 11:06:32 +1100500 memset(*readsetp, 0, *nallocp);
501 memset(*writesetp, 0, *nallocp);
Damien Miller164a7f42001-10-12 11:36:09 +1000502 return;
Ben Lindstromc8b3f472001-05-17 03:19:40 +0000503 } else {
504 FD_SET(connection_in, *readsetp);
505 }
Damien Miller1383bd82000-04-06 12:32:37 +1000506 }
507
Damien Miller95def091999-11-25 00:26:21 +1100508 /* Select server connection if have data to write to the server. */
509 if (packet_have_data_to_write())
Damien Miller5e953212001-01-30 09:14:00 +1100510 FD_SET(connection_out, *writesetp);
Damien Miller95def091999-11-25 00:26:21 +1100511
Damien Miller0e220db2004-06-15 10:34:08 +1000512 if (control_fd != -1)
513 FD_SET(control_fd, *readsetp);
514
Damien Miller5428f641999-11-25 11:54:57 +1100515 /*
516 * Wait for something to happen. This will suspend the process until
517 * some selected descriptor can be read, written, or has some other
Damien Miller509b0102003-12-17 16:33:10 +1100518 * event pending.
Damien Miller5428f641999-11-25 11:54:57 +1100519 */
Damien Miller95def091999-11-25 00:26:21 +1100520
Damien Miller509b0102003-12-17 16:33:10 +1100521 if (options.server_alive_interval == 0 || !compat20)
522 tvp = NULL;
Darren Tuckerfc959702004-07-17 16:12:08 +1000523 else {
Damien Miller509b0102003-12-17 16:33:10 +1100524 tv.tv_sec = options.server_alive_interval;
525 tv.tv_usec = 0;
526 tvp = &tv;
527 }
528 ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
529 if (ret < 0) {
Damien Miller95def091999-11-25 00:26:21 +1100530 char buf[100];
Ben Lindstromf9452512001-02-15 03:12:08 +0000531
532 /*
533 * We have to clear the select masks, because we return.
534 * We have to return, because the mainloop checks for the flags
535 * set by the signal handlers.
536 */
Damien Miller79faeff2001-11-12 11:06:32 +1100537 memset(*readsetp, 0, *nallocp);
538 memset(*writesetp, 0, *nallocp);
Ben Lindstromf9452512001-02-15 03:12:08 +0000539
Damien Miller95def091999-11-25 00:26:21 +1100540 if (errno == EINTR)
541 return;
542 /* Note: we might still have data in the buffers. */
543 snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
544 buffer_append(&stderr_buffer, buf, strlen(buf));
Damien Miller95def091999-11-25 00:26:21 +1100545 quit_pending = 1;
Damien Miller509b0102003-12-17 16:33:10 +1100546 } else if (ret == 0)
547 server_alive_check();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000548}
549
Ben Lindstrombba81212001-06-25 05:01:22 +0000550static void
Damien Millerad833b32000-08-23 10:46:23 +1000551client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000552{
Damien Miller95def091999-11-25 00:26:21 +1100553 /* Flush stdout and stderr buffers. */
Damien Millerad833b32000-08-23 10:46:23 +1000554 if (buffer_len(bout) > 0)
Darren Tucker9f63f222003-07-03 13:46:56 +1000555 atomicio(vwrite, fileno(stdout), buffer_ptr(bout), buffer_len(bout));
Damien Millerad833b32000-08-23 10:46:23 +1000556 if (buffer_len(berr) > 0)
Darren Tucker9f63f222003-07-03 13:46:56 +1000557 atomicio(vwrite, fileno(stderr), buffer_ptr(berr), buffer_len(berr));
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000558
Damien Miller95def091999-11-25 00:26:21 +1100559 leave_raw_mode();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000560
Damien Miller5428f641999-11-25 11:54:57 +1100561 /*
562 * Free (and clear) the buffer to reduce the amount of data that gets
563 * written to swap.
564 */
Damien Millerad833b32000-08-23 10:46:23 +1000565 buffer_free(bin);
566 buffer_free(bout);
567 buffer_free(berr);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000568
Damien Miller95def091999-11-25 00:26:21 +1100569 /* Send the suspend signal to the program itself. */
570 kill(getpid(), SIGTSTP);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000571
Darren Tucker5d78de62004-11-05 20:35:44 +1100572 /* Reset window sizes in case they have changed */
573 received_window_change_signal = 1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000574
Damien Miller95def091999-11-25 00:26:21 +1100575 /* OK, we have been continued by the user. Reinitialize buffers. */
Damien Millerad833b32000-08-23 10:46:23 +1000576 buffer_init(bin);
577 buffer_init(bout);
578 buffer_init(berr);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000579
Damien Miller95def091999-11-25 00:26:21 +1100580 enter_raw_mode();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000581}
582
Ben Lindstrombba81212001-06-25 05:01:22 +0000583static void
Damien Miller1383bd82000-04-06 12:32:37 +1000584client_process_net_input(fd_set * readset)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000585{
Damien Miller1383bd82000-04-06 12:32:37 +1000586 int len;
587 char buf[8192];
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000588
Damien Miller5428f641999-11-25 11:54:57 +1100589 /*
590 * Read input from the server, and add any such data to the buffer of
591 * the packet subsystem.
592 */
Damien Miller95def091999-11-25 00:26:21 +1100593 if (FD_ISSET(connection_in, readset)) {
594 /* Read as much as possible. */
595 len = read(connection_in, buf, sizeof(buf));
596 if (len == 0) {
597 /* Received EOF. The remote host has closed the connection. */
598 snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n",
599 host);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000600 buffer_append(&stderr_buffer, buf, strlen(buf));
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000601 quit_pending = 1;
602 return;
Damien Miller95def091999-11-25 00:26:21 +1100603 }
Damien Miller5428f641999-11-25 11:54:57 +1100604 /*
605 * There is a kernel bug on Solaris that causes select to
606 * sometimes wake up even though there is no data available.
607 */
Ben Lindstromebc88272001-03-06 03:34:40 +0000608 if (len < 0 && (errno == EAGAIN || errno == EINTR))
Damien Miller95def091999-11-25 00:26:21 +1100609 len = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000610
Damien Miller95def091999-11-25 00:26:21 +1100611 if (len < 0) {
612 /* An error has encountered. Perhaps there is a network problem. */
613 snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n",
614 host, strerror(errno));
615 buffer_append(&stderr_buffer, buf, strlen(buf));
Damien Miller95def091999-11-25 00:26:21 +1100616 quit_pending = 1;
617 return;
618 }
619 packet_process_incoming(buf, len);
620 }
Damien Miller1383bd82000-04-06 12:32:37 +1000621}
622
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000623static void
Damien Miller0e220db2004-06-15 10:34:08 +1000624client_subsystem_reply(int type, u_int32_t seq, void *ctxt)
625{
626 int id;
627 Channel *c;
Darren Tuckerfc959702004-07-17 16:12:08 +1000628
Damien Miller0e220db2004-06-15 10:34:08 +1000629 id = packet_get_int();
630 packet_check_eom();
631
632 if ((c = channel_lookup(id)) == NULL) {
633 error("%s: no channel for id %d", __func__, id);
634 return;
635 }
636
637 if (type == SSH2_MSG_CHANNEL_SUCCESS)
638 debug2("Request suceeded on channel %d", id);
639 else if (type == SSH2_MSG_CHANNEL_FAILURE) {
640 error("Request failed on channel %d", id);
641 channel_free(c);
642 }
643}
644
645static void
646client_extra_session2_setup(int id, void *arg)
647{
648 struct confirm_ctx *cctx = arg;
Damien Miller13390022005-07-06 09:44:19 +1000649 const char *display;
Damien Miller0e220db2004-06-15 10:34:08 +1000650 Channel *c;
Damien Miller3756dce2004-06-18 01:17:29 +1000651 int i;
Darren Tuckerfc959702004-07-17 16:12:08 +1000652
Damien Miller0e220db2004-06-15 10:34:08 +1000653 if (cctx == NULL)
654 fatal("%s: cctx == NULL", __func__);
655 if ((c = channel_lookup(id)) == NULL)
656 fatal("%s: no channel for id %d", __func__, id);
657
Damien Miller46d38de2005-07-17 17:02:09 +1000658 display = getenv("DISPLAY");
Damien Miller13390022005-07-06 09:44:19 +1000659 if (cctx->want_x_fwd && options.forward_x11 && display != NULL) {
660 char *proto, *data;
661 /* Get reasonable local authentication information. */
662 client_x11_get_proto(display, options.xauth_location,
663 options.forward_x11_trusted, &proto, &data);
664 /* Request forwarding with authentication spoofing. */
665 debug("Requesting X11 forwarding with authentication spoofing.");
666 x11_request_forwarding_with_spoofing(id, display, proto, data);
667 /* XXX wait for reply */
668 }
669
670 if (cctx->want_agent_fwd && options.forward_agent) {
671 debug("Requesting authentication agent forwarding.");
672 channel_request_start(id, "auth-agent-req@openssh.com", 0);
673 packet_send();
674 }
675
Darren Tuckerfc959702004-07-17 16:12:08 +1000676 client_session2_setup(id, cctx->want_tty, cctx->want_subsys,
Damien Miller3756dce2004-06-18 01:17:29 +1000677 cctx->term, &cctx->tio, c->rfd, &cctx->cmd, cctx->env,
Damien Miller0e220db2004-06-15 10:34:08 +1000678 client_subsystem_reply);
Damien Miller23f07702004-06-18 01:19:03 +1000679
Damien Miller0e220db2004-06-15 10:34:08 +1000680 c->confirm_ctx = NULL;
681 buffer_free(&cctx->cmd);
Damien Miller3756dce2004-06-18 01:17:29 +1000682 xfree(cctx->term);
683 if (cctx->env != NULL) {
684 for (i = 0; cctx->env[i] != NULL; i++)
685 xfree(cctx->env[i]);
686 xfree(cctx->env);
Darren Tuckerfc959702004-07-17 16:12:08 +1000687 }
Damien Miller3756dce2004-06-18 01:17:29 +1000688 xfree(cctx);
Damien Miller0e220db2004-06-15 10:34:08 +1000689}
690
691static void
692client_process_control(fd_set * readset)
693{
694 Buffer m;
695 Channel *c;
Damien Millereccb9de2005-06-17 12:59:34 +1000696 int client_fd, new_fd[3], ver, allowed;
Damien Miller0e220db2004-06-15 10:34:08 +1000697 socklen_t addrlen;
698 struct sockaddr_storage addr;
699 struct confirm_ctx *cctx;
700 char *cmd;
Damien Millereccb9de2005-06-17 12:59:34 +1000701 u_int i, len, env_len, command, flags;
Damien Miller0e220db2004-06-15 10:34:08 +1000702 uid_t euid;
703 gid_t egid;
704
705 /*
706 * Accept connection on control socket
707 */
708 if (control_fd == -1 || !FD_ISSET(control_fd, readset))
709 return;
710
711 memset(&addr, 0, sizeof(addr));
712 addrlen = sizeof(addr);
713 if ((client_fd = accept(control_fd,
714 (struct sockaddr*)&addr, &addrlen)) == -1) {
715 error("%s accept: %s", __func__, strerror(errno));
716 return;
717 }
718
719 if (getpeereid(client_fd, &euid, &egid) < 0) {
720 error("%s getpeereid failed: %s", __func__, strerror(errno));
721 close(client_fd);
722 return;
723 }
724 if ((euid != 0) && (getuid() != euid)) {
725 error("control mode uid mismatch: peer euid %u != uid %u",
726 (u_int) euid, (u_int) getuid());
727 close(client_fd);
728 return;
729 }
Damien Miller23f07702004-06-18 01:19:03 +1000730
Damien Miller0e220db2004-06-15 10:34:08 +1000731 unset_nonblock(client_fd);
732
Darren Tucker7ebfc102004-11-07 20:06:19 +1100733 /* Read command */
Damien Miller0e220db2004-06-15 10:34:08 +1000734 buffer_init(&m);
Darren Tucker7ebfc102004-11-07 20:06:19 +1100735 if (ssh_msg_recv(client_fd, &m) == -1) {
736 error("%s: client msg_recv failed", __func__);
737 close(client_fd);
738 buffer_free(&m);
739 return;
740 }
Damien Miller13390022005-07-06 09:44:19 +1000741 if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
Darren Tucker7ebfc102004-11-07 20:06:19 +1100742 error("%s: wrong client version %d", __func__, ver);
743 buffer_free(&m);
744 close(client_fd);
745 return;
746 }
Damien Miller0e220db2004-06-15 10:34:08 +1000747
Darren Tucker7ebfc102004-11-07 20:06:19 +1100748 allowed = 1;
749 command = buffer_get_int(&m);
750 flags = buffer_get_int(&m);
751
752 buffer_clear(&m);
753
754 switch (command) {
755 case SSHMUX_COMMAND_OPEN:
Damien Millerd14b1e72005-06-16 13:19:41 +1000756 if (options.control_master == SSHCTL_MASTER_ASK ||
757 options.control_master == SSHCTL_MASTER_AUTO_ASK)
Darren Tucker7ebfc102004-11-07 20:06:19 +1100758 allowed = ask_permission("Allow shared connection "
759 "to %s? ", host);
760 /* continue below */
761 break;
762 case SSHMUX_COMMAND_TERMINATE:
Damien Millerd14b1e72005-06-16 13:19:41 +1000763 if (options.control_master == SSHCTL_MASTER_ASK ||
764 options.control_master == SSHCTL_MASTER_AUTO_ASK)
Darren Tucker7ebfc102004-11-07 20:06:19 +1100765 allowed = ask_permission("Terminate shared connection "
766 "to %s? ", host);
767 if (allowed)
768 quit_pending = 1;
Darren Tucker47eede72005-03-14 23:08:12 +1100769 /* FALLTHROUGH */
Darren Tucker7ebfc102004-11-07 20:06:19 +1100770 case SSHMUX_COMMAND_ALIVE_CHECK:
771 /* Reply for SSHMUX_COMMAND_TERMINATE and ALIVE_CHECK */
772 buffer_clear(&m);
773 buffer_put_int(&m, allowed);
774 buffer_put_int(&m, getpid());
Damien Miller13390022005-07-06 09:44:19 +1000775 if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
Darren Tucker7ebfc102004-11-07 20:06:19 +1100776 error("%s: client msg_send failed", __func__);
777 close(client_fd);
778 buffer_free(&m);
779 return;
780 }
781 buffer_free(&m);
782 close(client_fd);
783 return;
784 default:
785 error("Unsupported command %d", command);
786 buffer_free(&m);
787 close(client_fd);
788 return;
789 }
790
791 /* Reply for SSHMUX_COMMAND_OPEN */
792 buffer_clear(&m);
Damien Miller23f07702004-06-18 01:19:03 +1000793 buffer_put_int(&m, allowed);
Damien Miller0e220db2004-06-15 10:34:08 +1000794 buffer_put_int(&m, getpid());
Damien Miller13390022005-07-06 09:44:19 +1000795 if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
Damien Miller0e220db2004-06-15 10:34:08 +1000796 error("%s: client msg_send failed", __func__);
797 close(client_fd);
Damien Miller23f07702004-06-18 01:19:03 +1000798 buffer_free(&m);
Damien Miller0e220db2004-06-15 10:34:08 +1000799 return;
800 }
Damien Miller0e220db2004-06-15 10:34:08 +1000801
Damien Miller23f07702004-06-18 01:19:03 +1000802 if (!allowed) {
803 error("Refused control connection");
804 close(client_fd);
805 buffer_free(&m);
806 return;
807 }
808
Darren Tucker7ebfc102004-11-07 20:06:19 +1100809 buffer_clear(&m);
Damien Miller0e220db2004-06-15 10:34:08 +1000810 if (ssh_msg_recv(client_fd, &m) == -1) {
811 error("%s: client msg_recv failed", __func__);
812 close(client_fd);
Damien Miller23f07702004-06-18 01:19:03 +1000813 buffer_free(&m);
Damien Miller0e220db2004-06-15 10:34:08 +1000814 return;
815 }
Damien Miller13390022005-07-06 09:44:19 +1000816 if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
Damien Miller0e220db2004-06-15 10:34:08 +1000817 error("%s: wrong client version %d", __func__, ver);
818 buffer_free(&m);
819 close(client_fd);
820 return;
821 }
822
823 cctx = xmalloc(sizeof(*cctx));
824 memset(cctx, 0, sizeof(*cctx));
Darren Tucker7ebfc102004-11-07 20:06:19 +1100825 cctx->want_tty = (flags & SSHMUX_FLAG_TTY) != 0;
826 cctx->want_subsys = (flags & SSHMUX_FLAG_SUBSYS) != 0;
Damien Miller13390022005-07-06 09:44:19 +1000827 cctx->want_x_fwd = (flags & SSHMUX_FLAG_X11_FWD) != 0;
828 cctx->want_agent_fwd = (flags & SSHMUX_FLAG_AGENT_FWD) != 0;
Damien Miller0e220db2004-06-15 10:34:08 +1000829 cctx->term = buffer_get_string(&m, &len);
830
831 cmd = buffer_get_string(&m, &len);
832 buffer_init(&cctx->cmd);
833 buffer_append(&cctx->cmd, cmd, strlen(cmd));
834
Damien Miller3756dce2004-06-18 01:17:29 +1000835 env_len = buffer_get_int(&m);
836 env_len = MIN(env_len, 4096);
837 debug3("%s: receiving %d env vars", __func__, env_len);
838 if (env_len != 0) {
839 cctx->env = xmalloc(sizeof(*cctx->env) * (env_len + 1));
840 for (i = 0; i < env_len; i++)
841 cctx->env[i] = buffer_get_string(&m, &len);
842 cctx->env[i] = NULL;
843 }
844
Damien Miller0e220db2004-06-15 10:34:08 +1000845 debug2("%s: accepted tty %d, subsys %d, cmd %s", __func__,
846 cctx->want_tty, cctx->want_subsys, cmd);
847
848 /* Gather fds from client */
849 new_fd[0] = mm_receive_fd(client_fd);
850 new_fd[1] = mm_receive_fd(client_fd);
851 new_fd[2] = mm_receive_fd(client_fd);
852
853 debug2("%s: got fds stdin %d, stdout %d, stderr %d", __func__,
854 new_fd[0], new_fd[1], new_fd[2]);
855
856 /* Try to pick up ttymodes from client before it goes raw */
857 if (cctx->want_tty && tcgetattr(new_fd[0], &cctx->tio) == -1)
858 error("%s: tcgetattr: %s", __func__, strerror(errno));
859
Darren Tucker7ebfc102004-11-07 20:06:19 +1100860 /* This roundtrip is just for synchronisation of ttymodes */
Damien Miller0e220db2004-06-15 10:34:08 +1000861 buffer_clear(&m);
Damien Miller13390022005-07-06 09:44:19 +1000862 if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
Damien Miller0e220db2004-06-15 10:34:08 +1000863 error("%s: client msg_send failed", __func__);
864 close(client_fd);
865 close(new_fd[0]);
866 close(new_fd[1]);
867 close(new_fd[2]);
Damien Miller23f07702004-06-18 01:19:03 +1000868 buffer_free(&m);
Darren Tucker7ebfc102004-11-07 20:06:19 +1100869 xfree(cctx->term);
870 if (env_len != 0) {
871 for (i = 0; i < env_len; i++)
872 xfree(cctx->env[i]);
873 xfree(cctx->env);
874 }
Damien Miller0e220db2004-06-15 10:34:08 +1000875 return;
876 }
877 buffer_free(&m);
878
879 /* enable nonblocking unless tty */
880 if (!isatty(new_fd[0]))
881 set_nonblock(new_fd[0]);
882 if (!isatty(new_fd[1]))
883 set_nonblock(new_fd[1]);
884 if (!isatty(new_fd[2]))
885 set_nonblock(new_fd[2]);
886
887 set_nonblock(client_fd);
888
Darren Tuckerfc959702004-07-17 16:12:08 +1000889 c = channel_new("session", SSH_CHANNEL_OPENING,
Damien Miller0e220db2004-06-15 10:34:08 +1000890 new_fd[0], new_fd[1], new_fd[2],
891 CHAN_SES_WINDOW_DEFAULT, CHAN_SES_PACKET_DEFAULT,
892 CHAN_EXTENDED_WRITE, "client-session", /*nonblock*/0);
893
894 /* XXX */
895 c->ctl_fd = client_fd;
896
897 debug3("%s: channel_new: %d", __func__, c->self);
898
899 channel_send_open(c->self);
900 channel_register_confirm(c->self, client_extra_session2_setup, cctx);
901}
902
903static void
Ben Lindstrom681d9322002-03-22 03:53:00 +0000904process_cmdline(void)
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000905{
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000906 void (*handler)(int);
Damien Millerf91ee4c2005-03-01 21:24:33 +1100907 char *s, *cmd, *cancel_host;
Darren Tuckere7066df2004-05-24 10:18:05 +1000908 int delete = 0;
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000909 int local = 0;
Damien Millerf91ee4c2005-03-01 21:24:33 +1100910 u_short cancel_port;
911 Forward fwd;
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000912
913 leave_raw_mode();
Ben Lindstrom5a6abda2002-06-09 19:41:48 +0000914 handler = signal(SIGINT, SIG_IGN);
Ben Lindstrom681d9322002-03-22 03:53:00 +0000915 cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000916 if (s == NULL)
917 goto out;
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000918 while (*s && isspace(*s))
919 s++;
Darren Tuckere7066df2004-05-24 10:18:05 +1000920 if (*s == '-')
921 s++; /* Skip cmdline '-', if any */
Darren Tuckere1675822004-05-24 10:13:07 +1000922 if (*s == '\0')
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000923 goto out;
Darren Tuckere7066df2004-05-24 10:18:05 +1000924
Darren Tucker1973c882004-05-24 10:34:36 +1000925 if (*s == 'h' || *s == 'H' || *s == '?') {
Darren Tuckere7066df2004-05-24 10:18:05 +1000926 logit("Commands:");
927 logit(" -Lport:host:hostport Request local forward");
928 logit(" -Rport:host:hostport Request remote forward");
929 logit(" -KRhostport Cancel remote forward");
Damien Millerd27b9472005-12-13 19:29:02 +1100930 if (!options.permit_local_command)
931 goto out;
932 logit(" !args Execute local command");
933 goto out;
934 }
935
936 if (*s == '!' && options.permit_local_command) {
937 s++;
938 ssh_local_cmd(s);
Darren Tuckere7066df2004-05-24 10:18:05 +1000939 goto out;
940 }
941
942 if (*s == 'K') {
943 delete = 1;
944 s++;
945 }
946 if (*s != 'L' && *s != 'R') {
Damien Miller996acd22003-04-09 20:59:48 +1000947 logit("Invalid command.");
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000948 goto out;
949 }
Darren Tuckere7066df2004-05-24 10:18:05 +1000950 if (*s == 'L')
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000951 local = 1;
Darren Tuckere7066df2004-05-24 10:18:05 +1000952 if (local && delete) {
953 logit("Not supported.");
954 goto out;
955 }
956 if ((!local || delete) && !compat20) {
Damien Miller996acd22003-04-09 20:59:48 +1000957 logit("Not supported for SSH protocol version 1.");
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000958 goto out;
959 }
Darren Tuckere7066df2004-05-24 10:18:05 +1000960
961 s++;
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000962 while (*s && isspace(*s))
963 s++;
964
Darren Tuckere7066df2004-05-24 10:18:05 +1000965 if (delete) {
Damien Millerf91ee4c2005-03-01 21:24:33 +1100966 cancel_port = 0;
967 cancel_host = hpdelim(&s); /* may be NULL */
968 if (s != NULL) {
969 cancel_port = a2port(s);
970 cancel_host = cleanhostname(cancel_host);
971 } else {
972 cancel_port = a2port(cancel_host);
973 cancel_host = NULL;
974 }
975 if (cancel_port == 0) {
976 logit("Bad forwarding close port");
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000977 goto out;
978 }
Damien Millerf91ee4c2005-03-01 21:24:33 +1100979 channel_request_rforward_cancel(cancel_host, cancel_port);
Darren Tuckere7066df2004-05-24 10:18:05 +1000980 } else {
Damien Millerf91ee4c2005-03-01 21:24:33 +1100981 if (!parse_forward(&fwd, s)) {
Darren Tuckere7066df2004-05-24 10:18:05 +1000982 logit("Bad forwarding specification.");
983 goto out;
984 }
Darren Tuckere7066df2004-05-24 10:18:05 +1000985 if (local) {
Damien Millerf91ee4c2005-03-01 21:24:33 +1100986 if (channel_setup_local_fwd_listener(fwd.listen_host,
987 fwd.listen_port, fwd.connect_host,
988 fwd.connect_port, options.gateway_ports) < 0) {
Darren Tuckere7066df2004-05-24 10:18:05 +1000989 logit("Port forwarding failed.");
990 goto out;
991 }
Damien Millerf91ee4c2005-03-01 21:24:33 +1100992 } else {
993 channel_request_remote_forwarding(fwd.listen_host,
994 fwd.listen_port, fwd.connect_host,
995 fwd.connect_port);
996 }
997
Darren Tuckere7066df2004-05-24 10:18:05 +1000998 logit("Forwarding port.");
999 }
1000
Ben Lindstrom5589f4b2002-03-22 03:24:32 +00001001out:
1002 signal(SIGINT, handler);
1003 enter_raw_mode();
1004 if (cmd)
1005 xfree(cmd);
1006}
1007
Damien Millerad833b32000-08-23 10:46:23 +10001008/* process the characters one by one */
Ben Lindstrombba81212001-06-25 05:01:22 +00001009static int
Damien Millerad833b32000-08-23 10:46:23 +10001010process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
1011{
1012 char string[1024];
1013 pid_t pid;
1014 int bytes = 0;
Ben Lindstrom46c16222000-12-22 01:43:59 +00001015 u_int i;
1016 u_char ch;
Damien Millerad833b32000-08-23 10:46:23 +10001017 char *s;
1018
Damien Millereccb9de2005-06-17 12:59:34 +10001019 if (len <= 0)
1020 return (0);
1021
1022 for (i = 0; i < (u_int)len; i++) {
Damien Millerad833b32000-08-23 10:46:23 +10001023 /* Get one character at a time. */
1024 ch = buf[i];
1025
1026 if (escape_pending) {
1027 /* We have previously seen an escape character. */
1028 /* Clear the flag now. */
1029 escape_pending = 0;
1030
1031 /* Process the escaped character. */
1032 switch (ch) {
1033 case '.':
1034 /* Terminate the connection. */
1035 snprintf(string, sizeof string, "%c.\r\n", escape_char);
1036 buffer_append(berr, string, strlen(string));
Damien Millerad833b32000-08-23 10:46:23 +10001037
1038 quit_pending = 1;
1039 return -1;
1040
1041 case 'Z' - 64:
1042 /* Suspend the program. */
1043 /* Print a message to that effect to the user. */
1044 snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char);
1045 buffer_append(berr, string, strlen(string));
Damien Millerad833b32000-08-23 10:46:23 +10001046
1047 /* Restore terminal modes and suspend. */
1048 client_suspend_self(bin, bout, berr);
1049
1050 /* We have been continued. */
1051 continue;
1052
Damien Miller54c45982003-05-15 10:20:13 +10001053 case 'B':
1054 if (compat20) {
1055 snprintf(string, sizeof string,
1056 "%cB\r\n", escape_char);
1057 buffer_append(berr, string,
1058 strlen(string));
1059 channel_request_start(session_ident,
1060 "break", 0);
1061 packet_put_int(1000);
1062 packet_send();
1063 }
1064 continue;
1065
Ben Lindstromf28f6342001-04-04 02:03:04 +00001066 case 'R':
Ben Lindstrom11bd8992001-04-05 23:34:29 +00001067 if (compat20) {
1068 if (datafellows & SSH_BUG_NOREKEY)
Damien Miller996acd22003-04-09 20:59:48 +10001069 logit("Server does not support re-keying");
Ben Lindstrom11bd8992001-04-05 23:34:29 +00001070 else
1071 need_rekeying = 1;
1072 }
Ben Lindstromf28f6342001-04-04 02:03:04 +00001073 continue;
1074
Damien Millerad833b32000-08-23 10:46:23 +10001075 case '&':
Damien Millerad833b32000-08-23 10:46:23 +10001076 /*
1077 * Detach the program (continue to serve connections,
1078 * but put in background and no more new connections).
1079 */
Damien Miller96507ef2001-11-12 10:52:25 +11001080 /* Restore tty modes. */
1081 leave_raw_mode();
1082
1083 /* Stop listening for new connections. */
1084 channel_stop_listening();
1085
1086 snprintf(string, sizeof string,
1087 "%c& [backgrounded]\n", escape_char);
1088 buffer_append(berr, string, strlen(string));
1089
1090 /* Fork into background. */
1091 pid = fork();
1092 if (pid < 0) {
1093 error("fork: %.100s", strerror(errno));
1094 continue;
1095 }
1096 if (pid != 0) { /* This is the parent. */
1097 /* The parent just exits. */
1098 exit(0);
1099 }
1100 /* The child continues serving connections. */
1101 if (compat20) {
1102 buffer_append(bin, "\004", 1);
1103 /* fake EOF on stdin */
1104 return -1;
1105 } else if (!stdin_eof) {
Damien Millerad833b32000-08-23 10:46:23 +10001106 /*
1107 * Sending SSH_CMSG_EOF alone does not always appear
1108 * to be enough. So we try to send an EOF character
1109 * first.
1110 */
1111 packet_start(SSH_CMSG_STDIN_DATA);
1112 packet_put_string("\004", 1);
1113 packet_send();
1114 /* Close stdin. */
1115 stdin_eof = 1;
1116 if (buffer_len(bin) == 0) {
1117 packet_start(SSH_CMSG_EOF);
1118 packet_send();
1119 }
1120 }
Damien Miller96507ef2001-11-12 10:52:25 +11001121 continue;
Damien Millerad833b32000-08-23 10:46:23 +10001122
1123 case '?':
1124 snprintf(string, sizeof string,
1125"%c?\r\n\
1126Supported escape sequences:\r\n\
Damien Miller06692862002-09-04 16:32:10 +10001127%c. - terminate connection\r\n\
Damien Miller54c45982003-05-15 10:20:13 +10001128%cB - send a BREAK to the remote system\r\n\
Damien Miller06692862002-09-04 16:32:10 +10001129%cC - open a command line\r\n\
1130%cR - Request rekey (SSH protocol 2 only)\r\n\
1131%c^Z - suspend ssh\r\n\
1132%c# - list forwarded connections\r\n\
1133%c& - background ssh (when waiting for connections to terminate)\r\n\
1134%c? - this message\r\n\
1135%c%c - send the escape character by typing it twice\r\n\
Damien Millerad833b32000-08-23 10:46:23 +10001136(Note that escapes are only recognized immediately after newline.)\r\n",
Damien Miller06692862002-09-04 16:32:10 +10001137 escape_char, escape_char, escape_char, escape_char,
1138 escape_char, escape_char, escape_char, escape_char,
Damien Miller54c45982003-05-15 10:20:13 +10001139 escape_char, escape_char, escape_char);
Damien Millerad833b32000-08-23 10:46:23 +10001140 buffer_append(berr, string, strlen(string));
1141 continue;
1142
1143 case '#':
1144 snprintf(string, sizeof string, "%c#\r\n", escape_char);
1145 buffer_append(berr, string, strlen(string));
1146 s = channel_open_message();
1147 buffer_append(berr, s, strlen(s));
1148 xfree(s);
1149 continue;
1150
Ben Lindstrom5589f4b2002-03-22 03:24:32 +00001151 case 'C':
Ben Lindstrom681d9322002-03-22 03:53:00 +00001152 process_cmdline();
Ben Lindstrom5589f4b2002-03-22 03:24:32 +00001153 continue;
1154
Damien Millerad833b32000-08-23 10:46:23 +10001155 default:
1156 if (ch != escape_char) {
1157 buffer_put_char(bin, escape_char);
1158 bytes++;
1159 }
1160 /* Escaped characters fall through here */
1161 break;
1162 }
1163 } else {
1164 /*
1165 * The previous character was not an escape char. Check if this
1166 * is an escape.
1167 */
1168 if (last_was_cr && ch == escape_char) {
1169 /* It is. Set the flag and continue to next character. */
1170 escape_pending = 1;
1171 continue;
1172 }
1173 }
1174
1175 /*
1176 * Normal character. Record whether it was a newline,
1177 * and append it to the buffer.
1178 */
1179 last_was_cr = (ch == '\r' || ch == '\n');
1180 buffer_put_char(bin, ch);
1181 bytes++;
1182 }
1183 return bytes;
1184}
1185
Ben Lindstrombba81212001-06-25 05:01:22 +00001186static void
Damien Miller1383bd82000-04-06 12:32:37 +10001187client_process_input(fd_set * readset)
1188{
Damien Miller166fca82000-04-20 07:42:21 +10001189 int len;
Damien Millerad833b32000-08-23 10:46:23 +10001190 char buf[8192];
Damien Miller1383bd82000-04-06 12:32:37 +10001191
Damien Miller95def091999-11-25 00:26:21 +11001192 /* Read input from stdin. */
1193 if (FD_ISSET(fileno(stdin), readset)) {
1194 /* Read as much as possible. */
1195 len = read(fileno(stdin), buf, sizeof(buf));
Ben Lindstrom4c8cff12001-04-17 18:09:42 +00001196 if (len < 0 && (errno == EAGAIN || errno == EINTR))
1197 return; /* we'll try again later */
Damien Miller95def091999-11-25 00:26:21 +11001198 if (len <= 0) {
Damien Miller5428f641999-11-25 11:54:57 +11001199 /*
1200 * Received EOF or error. They are treated
1201 * similarly, except that an error message is printed
1202 * if it was an error condition.
1203 */
Damien Miller95def091999-11-25 00:26:21 +11001204 if (len < 0) {
1205 snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno));
1206 buffer_append(&stderr_buffer, buf, strlen(buf));
Damien Miller95def091999-11-25 00:26:21 +11001207 }
1208 /* Mark that we have seen EOF. */
1209 stdin_eof = 1;
Damien Miller5428f641999-11-25 11:54:57 +11001210 /*
1211 * Send an EOF message to the server unless there is
1212 * data in the buffer. If there is data in the
1213 * buffer, no message will be sent now. Code
1214 * elsewhere will send the EOF when the buffer
1215 * becomes empty if stdin_eof is set.
1216 */
Damien Miller95def091999-11-25 00:26:21 +11001217 if (buffer_len(&stdin_buffer) == 0) {
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001218 packet_start(SSH_CMSG_EOF);
1219 packet_send();
Damien Miller95def091999-11-25 00:26:21 +11001220 }
Ben Lindstrom2b1f71b2001-06-05 20:32:21 +00001221 } else if (escape_char == SSH_ESCAPECHAR_NONE) {
Damien Miller5428f641999-11-25 11:54:57 +11001222 /*
1223 * Normal successful read, and no escape character.
1224 * Just append the data to buffer.
1225 */
Damien Miller95def091999-11-25 00:26:21 +11001226 buffer_append(&stdin_buffer, buf, len);
Damien Miller95def091999-11-25 00:26:21 +11001227 } else {
Damien Miller5428f641999-11-25 11:54:57 +11001228 /*
1229 * Normal, successful read. But we have an escape character
1230 * and have to process the characters one by one.
1231 */
Ben Lindstrome9613cf2001-03-05 06:14:02 +00001232 if (process_escapes(&stdin_buffer, &stdout_buffer,
1233 &stderr_buffer, buf, len) == -1)
Damien Millerad833b32000-08-23 10:46:23 +10001234 return;
Damien Miller95def091999-11-25 00:26:21 +11001235 }
1236 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001237}
1238
Ben Lindstrombba81212001-06-25 05:01:22 +00001239static void
Damien Miller95def091999-11-25 00:26:21 +11001240client_process_output(fd_set * writeset)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001241{
Damien Miller95def091999-11-25 00:26:21 +11001242 int len;
1243 char buf[100];
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001244
Damien Miller95def091999-11-25 00:26:21 +11001245 /* Write buffered output to stdout. */
1246 if (FD_ISSET(fileno(stdout), writeset)) {
1247 /* Write as much data as possible. */
1248 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
Damien Miller037a0dc1999-12-07 15:38:31 +11001249 buffer_len(&stdout_buffer));
Damien Miller95def091999-11-25 00:26:21 +11001250 if (len <= 0) {
Ben Lindstrom4c8cff12001-04-17 18:09:42 +00001251 if (errno == EINTR || errno == EAGAIN)
Damien Miller95def091999-11-25 00:26:21 +11001252 len = 0;
1253 else {
Damien Miller5428f641999-11-25 11:54:57 +11001254 /*
1255 * An error or EOF was encountered. Put an
1256 * error message to stderr buffer.
1257 */
Damien Miller95def091999-11-25 00:26:21 +11001258 snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno));
1259 buffer_append(&stderr_buffer, buf, strlen(buf));
Damien Miller95def091999-11-25 00:26:21 +11001260 quit_pending = 1;
1261 return;
1262 }
1263 }
1264 /* Consume printed data from the buffer. */
1265 buffer_consume(&stdout_buffer, len);
Ben Lindstroma3700052001-04-05 23:26:32 +00001266 stdout_bytes += len;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001267 }
Damien Miller95def091999-11-25 00:26:21 +11001268 /* Write buffered output to stderr. */
1269 if (FD_ISSET(fileno(stderr), writeset)) {
1270 /* Write as much data as possible. */
1271 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
Damien Miller037a0dc1999-12-07 15:38:31 +11001272 buffer_len(&stderr_buffer));
Damien Miller95def091999-11-25 00:26:21 +11001273 if (len <= 0) {
Ben Lindstrom4c8cff12001-04-17 18:09:42 +00001274 if (errno == EINTR || errno == EAGAIN)
Damien Miller95def091999-11-25 00:26:21 +11001275 len = 0;
1276 else {
Damien Miller5428f641999-11-25 11:54:57 +11001277 /* EOF or error, but can't even print error message. */
Damien Miller95def091999-11-25 00:26:21 +11001278 quit_pending = 1;
1279 return;
1280 }
1281 }
1282 /* Consume printed characters from the buffer. */
1283 buffer_consume(&stderr_buffer, len);
Ben Lindstroma3700052001-04-05 23:26:32 +00001284 stderr_bytes += len;
Damien Miller95def091999-11-25 00:26:21 +11001285 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001286}
1287
Damien Miller5428f641999-11-25 11:54:57 +11001288/*
Damien Millerb38eff82000-04-01 11:09:21 +10001289 * Get packets from the connection input buffer, and process them as long as
1290 * there are packets available.
1291 *
1292 * Any unknown packets received during the actual
1293 * session cause the session to terminate. This is
1294 * intended to make debugging easier since no
1295 * confirmations are sent. Any compatible protocol
1296 * extensions must be negotiated during the
1297 * preparatory phase.
1298 */
1299
Ben Lindstrombba81212001-06-25 05:01:22 +00001300static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00001301client_process_buffered_input_packets(void)
Damien Millerb38eff82000-04-01 11:09:21 +10001302{
Ben Lindstromf28f6342001-04-04 02:03:04 +00001303 dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL);
Damien Millerb38eff82000-04-01 11:09:21 +10001304}
1305
Damien Millerad833b32000-08-23 10:46:23 +10001306/* scan buf[] for '~' before sending data to the peer */
1307
Ben Lindstrombba81212001-06-25 05:01:22 +00001308static int
Damien Millerad833b32000-08-23 10:46:23 +10001309simple_escape_filter(Channel *c, char *buf, int len)
1310{
1311 /* XXX we assume c->extended is writeable */
1312 return process_escapes(&c->input, &c->output, &c->extended, buf, len);
1313}
1314
Ben Lindstrombba81212001-06-25 05:01:22 +00001315static void
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001316client_channel_closed(int id, void *arg)
1317{
Damien Miller3ec27592001-10-12 11:35:04 +10001318 channel_cancel_cleanup(id);
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001319 session_closed = 1;
Darren Tucker9a2c4cd2003-09-22 21:16:05 +10001320 leave_raw_mode();
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001321}
1322
Damien Millerb38eff82000-04-01 11:09:21 +10001323/*
Damien Miller5428f641999-11-25 11:54:57 +11001324 * Implements the interactive session with the server. This is called after
1325 * the user has been authenticated, and a command has been started on the
Ben Lindstrom2b1f71b2001-06-05 20:32:21 +00001326 * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1327 * used as an escape character for terminating or suspending the session.
Damien Miller5428f641999-11-25 11:54:57 +11001328 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001329
Damien Miller4af51302000-04-16 11:18:38 +10001330int
Damien Millerad833b32000-08-23 10:46:23 +10001331client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001332{
Damien Miller5e953212001-01-30 09:14:00 +11001333 fd_set *readset = NULL, *writeset = NULL;
Damien Miller95def091999-11-25 00:26:21 +11001334 double start_time, total_time;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10001335 int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1336 u_int nalloc = 0;
Damien Miller95def091999-11-25 00:26:21 +11001337 char buf[100];
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001338
Damien Miller95def091999-11-25 00:26:21 +11001339 debug("Entering interactive session.");
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001340
Damien Miller95def091999-11-25 00:26:21 +11001341 start_time = get_current_time();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001342
Damien Miller95def091999-11-25 00:26:21 +11001343 /* Initialize variables. */
1344 escape_pending = 0;
1345 last_was_cr = 1;
1346 exit_status = -1;
1347 stdin_eof = 0;
1348 buffer_high = 64 * 1024;
1349 connection_in = packet_get_connection_in();
1350 connection_out = packet_get_connection_out();
Damien Miller5e953212001-01-30 09:14:00 +11001351 max_fd = MAX(connection_in, connection_out);
Damien Miller0e220db2004-06-15 10:34:08 +10001352 if (control_fd != -1)
1353 max_fd = MAX(max_fd, control_fd);
Damien Miller5e953212001-01-30 09:14:00 +11001354
1355 if (!compat20) {
Ben Lindstrom302ea6f2001-04-16 02:01:25 +00001356 /* enable nonblocking unless tty */
1357 if (!isatty(fileno(stdin)))
1358 set_nonblock(fileno(stdin));
1359 if (!isatty(fileno(stdout)))
1360 set_nonblock(fileno(stdout));
1361 if (!isatty(fileno(stderr)))
1362 set_nonblock(fileno(stderr));
Damien Miller5e953212001-01-30 09:14:00 +11001363 max_fd = MAX(max_fd, fileno(stdin));
1364 max_fd = MAX(max_fd, fileno(stdout));
1365 max_fd = MAX(max_fd, fileno(stderr));
1366 }
Damien Miller95def091999-11-25 00:26:21 +11001367 stdin_bytes = 0;
1368 stdout_bytes = 0;
1369 stderr_bytes = 0;
1370 quit_pending = 0;
1371 escape_char = escape_char_arg;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001372
Damien Miller95def091999-11-25 00:26:21 +11001373 /* Initialize buffers. */
1374 buffer_init(&stdin_buffer);
1375 buffer_init(&stdout_buffer);
1376 buffer_init(&stderr_buffer);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001377
Damien Millerb38eff82000-04-01 11:09:21 +10001378 client_init_dispatch();
1379
Ben Lindstromf49dbff2002-12-23 02:01:55 +00001380 /*
1381 * Set signal handlers, (e.g. to restore non-blocking mode)
1382 * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1383 */
Darren Tucker07336da2004-11-05 20:02:16 +11001384 if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1385 signal(SIGHUP, signal_handler);
Ben Lindstromf49dbff2002-12-23 02:01:55 +00001386 if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1387 signal(SIGINT, signal_handler);
1388 if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1389 signal(SIGQUIT, signal_handler);
1390 if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1391 signal(SIGTERM, signal_handler);
Darren Tucker5d78de62004-11-05 20:35:44 +11001392 signal(SIGWINCH, window_change_handler);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001393
Damien Miller95def091999-11-25 00:26:21 +11001394 if (have_pty)
1395 enter_raw_mode();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001396
Ben Lindstrom5b828322001-02-09 01:34:36 +00001397 if (compat20) {
1398 session_ident = ssh2_chan_id;
Ben Lindstrom2b1f71b2001-06-05 20:32:21 +00001399 if (escape_char != SSH_ESCAPECHAR_NONE)
Ben Lindstrom5b828322001-02-09 01:34:36 +00001400 channel_register_filter(session_ident,
Damien Miller077b2382005-12-31 16:22:32 +11001401 simple_escape_filter, NULL);
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001402 if (session_ident != -1)
1403 channel_register_cleanup(session_ident,
Damien Miller39eda6e2005-11-05 14:52:50 +11001404 client_channel_closed, 0);
Ben Lindstrom5b828322001-02-09 01:34:36 +00001405 } else {
1406 /* Check if we should immediately send eof on stdin. */
Damien Miller1383bd82000-04-06 12:32:37 +10001407 client_check_initial_eof_on_stdin();
Ben Lindstrom5b828322001-02-09 01:34:36 +00001408 }
Damien Millerad833b32000-08-23 10:46:23 +10001409
Damien Miller95def091999-11-25 00:26:21 +11001410 /* Main loop of the client for the interactive session mode. */
1411 while (!quit_pending) {
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001412
Damien Miller5428f641999-11-25 11:54:57 +11001413 /* Process buffered packets sent by the server. */
Damien Miller95def091999-11-25 00:26:21 +11001414 client_process_buffered_input_packets();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001415
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001416 if (compat20 && session_closed && !channel_still_open())
Damien Miller1383bd82000-04-06 12:32:37 +10001417 break;
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001418
1419 rekeying = (xxx_kex != NULL && !xxx_kex->done);
Damien Miller1383bd82000-04-06 12:32:37 +10001420
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001421 if (rekeying) {
1422 debug("rekeying in progress");
1423 } else {
1424 /*
1425 * Make packets of buffered stdin data, and buffer
1426 * them for sending to the server.
1427 */
1428 if (!compat20)
1429 client_make_packets_from_stdin_data();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001430
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001431 /*
1432 * Make packets from buffered channel data, and
1433 * enqueue them for sending to the server.
1434 */
1435 if (packet_not_very_much_data_to_write())
1436 channel_output_poll();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001437
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001438 /*
1439 * Check if the window size has changed, and buffer a
1440 * message about it to the server if so.
1441 */
1442 client_check_window_change();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001443
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001444 if (quit_pending)
1445 break;
1446 }
Damien Miller5428f641999-11-25 11:54:57 +11001447 /*
1448 * Wait until we have something to do (something becomes
1449 * available on one of the descriptors).
1450 */
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001451 max_fd2 = max_fd;
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001452 client_wait_until_can_do_something(&readset, &writeset,
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001453 &max_fd2, &nalloc, rekeying);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001454
Damien Miller95def091999-11-25 00:26:21 +11001455 if (quit_pending)
1456 break;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001457
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001458 /* Do channel operations unless rekeying in progress. */
1459 if (!rekeying) {
1460 channel_after_select(readset, writeset);
Damien Millera5539d22003-04-09 20:50:06 +10001461 if (need_rekeying || packet_need_rekeying()) {
1462 debug("need rekeying");
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001463 xxx_kex->done = 0;
1464 kex_send_kexinit(xxx_kex);
1465 need_rekeying = 0;
1466 }
1467 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001468
Damien Miller1383bd82000-04-06 12:32:37 +10001469 /* Buffer input from the connection. */
Damien Miller5e953212001-01-30 09:14:00 +11001470 client_process_net_input(readset);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001471
Damien Miller0e220db2004-06-15 10:34:08 +10001472 /* Accept control connections. */
1473 client_process_control(readset);
1474
Damien Miller1383bd82000-04-06 12:32:37 +10001475 if (quit_pending)
1476 break;
1477
1478 if (!compat20) {
1479 /* Buffer data from stdin */
Damien Miller5e953212001-01-30 09:14:00 +11001480 client_process_input(readset);
Damien Miller1383bd82000-04-06 12:32:37 +10001481 /*
1482 * Process output to stdout and stderr. Output to
1483 * the connection is processed elsewhere (above).
1484 */
Damien Miller5e953212001-01-30 09:14:00 +11001485 client_process_output(writeset);
Damien Miller1383bd82000-04-06 12:32:37 +10001486 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001487
Damien Miller5428f641999-11-25 11:54:57 +11001488 /* Send as much buffered packet data as possible to the sender. */
Damien Miller5e953212001-01-30 09:14:00 +11001489 if (FD_ISSET(connection_out, writeset))
Damien Miller95def091999-11-25 00:26:21 +11001490 packet_write_poll();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001491 }
Damien Miller5e953212001-01-30 09:14:00 +11001492 if (readset)
1493 xfree(readset);
1494 if (writeset)
1495 xfree(writeset);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001496
Damien Miller95def091999-11-25 00:26:21 +11001497 /* Terminate the session. */
1498
1499 /* Stop watching for window change. */
Darren Tucker5d78de62004-11-05 20:35:44 +11001500 signal(SIGWINCH, SIG_DFL);
Damien Miller95def091999-11-25 00:26:21 +11001501
Ben Lindstrom601e4362001-06-21 03:19:23 +00001502 channel_free_all();
Damien Miller95def091999-11-25 00:26:21 +11001503
Ben Lindstromec46e0b2001-06-09 01:27:31 +00001504 if (have_pty)
1505 leave_raw_mode();
Ben Lindstromc93e84c2001-05-12 00:08:37 +00001506
1507 /* restore blocking io */
1508 if (!isatty(fileno(stdin)))
1509 unset_nonblock(fileno(stdin));
1510 if (!isatty(fileno(stdout)))
1511 unset_nonblock(fileno(stdout));
1512 if (!isatty(fileno(stderr)))
1513 unset_nonblock(fileno(stderr));
1514
Damien Millerd6965512003-12-17 16:31:53 +11001515 /*
1516 * If there was no shell or command requested, there will be no remote
1517 * exit status to be returned. In that case, clear error code if the
1518 * connection was deliberately terminated at this end.
1519 */
1520 if (no_shell_flag && received_signal == SIGTERM) {
1521 received_signal = 0;
1522 exit_status = 0;
1523 }
1524
Darren Tucker9a2c4cd2003-09-22 21:16:05 +10001525 if (received_signal)
Ben Lindstromf8f065b2001-12-06 17:52:16 +00001526 fatal("Killed by signal %d.", (int) received_signal);
Ben Lindstromec46e0b2001-06-09 01:27:31 +00001527
1528 /*
1529 * In interactive mode (with pseudo tty) display a message indicating
1530 * that the connection has been closed.
1531 */
1532 if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1533 snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host);
1534 buffer_append(&stderr_buffer, buf, strlen(buf));
1535 }
1536
Damien Miller95def091999-11-25 00:26:21 +11001537 /* Output any buffered data for stdout. */
Ben Lindstromc93e84c2001-05-12 00:08:37 +00001538 while (buffer_len(&stdout_buffer) > 0) {
1539 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
Damien Miller037a0dc1999-12-07 15:38:31 +11001540 buffer_len(&stdout_buffer));
Ben Lindstromc93e84c2001-05-12 00:08:37 +00001541 if (len <= 0) {
Damien Miller95def091999-11-25 00:26:21 +11001542 error("Write failed flushing stdout buffer.");
Ben Lindstromc93e84c2001-05-12 00:08:37 +00001543 break;
1544 }
Damien Miller95def091999-11-25 00:26:21 +11001545 buffer_consume(&stdout_buffer, len);
Ben Lindstroma3700052001-04-05 23:26:32 +00001546 stdout_bytes += len;
Damien Miller95def091999-11-25 00:26:21 +11001547 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001548
Damien Miller95def091999-11-25 00:26:21 +11001549 /* Output any buffered data for stderr. */
Ben Lindstromc93e84c2001-05-12 00:08:37 +00001550 while (buffer_len(&stderr_buffer) > 0) {
1551 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
Damien Miller037a0dc1999-12-07 15:38:31 +11001552 buffer_len(&stderr_buffer));
Ben Lindstromc93e84c2001-05-12 00:08:37 +00001553 if (len <= 0) {
Damien Miller95def091999-11-25 00:26:21 +11001554 error("Write failed flushing stderr buffer.");
Ben Lindstromc93e84c2001-05-12 00:08:37 +00001555 break;
1556 }
Damien Miller95def091999-11-25 00:26:21 +11001557 buffer_consume(&stderr_buffer, len);
Ben Lindstroma3700052001-04-05 23:26:32 +00001558 stderr_bytes += len;
Damien Miller95def091999-11-25 00:26:21 +11001559 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001560
Damien Miller95def091999-11-25 00:26:21 +11001561 /* Clear and free any buffers. */
1562 memset(buf, 0, sizeof(buf));
1563 buffer_free(&stdin_buffer);
1564 buffer_free(&stdout_buffer);
1565 buffer_free(&stderr_buffer);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001566
Damien Miller95def091999-11-25 00:26:21 +11001567 /* Report bytes transferred, and transfer rates. */
1568 total_time = get_current_time() - start_time;
1569 debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds",
Damien Miller9f0f5c62001-12-21 14:45:46 +11001570 stdin_bytes, stdout_bytes, stderr_bytes, total_time);
Damien Miller95def091999-11-25 00:26:21 +11001571 if (total_time > 0)
1572 debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
Damien Miller9f0f5c62001-12-21 14:45:46 +11001573 stdin_bytes / total_time, stdout_bytes / total_time,
1574 stderr_bytes / total_time);
Damien Miller95def091999-11-25 00:26:21 +11001575
1576 /* Return the exit status of the program. */
1577 debug("Exit status %d", exit_status);
1578 return exit_status;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001579}
Damien Millerb38eff82000-04-01 11:09:21 +10001580
1581/*********/
1582
Ben Lindstrombba81212001-06-25 05:01:22 +00001583static void
Damien Miller630d6f42002-01-22 23:17:30 +11001584client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10001585{
Ben Lindstrom46c16222000-12-22 01:43:59 +00001586 u_int data_len;
Damien Millerb38eff82000-04-01 11:09:21 +10001587 char *data = packet_get_string(&data_len);
Damien Miller48b03fc2002-01-22 23:11:40 +11001588 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10001589 buffer_append(&stdout_buffer, data, data_len);
Damien Millerb38eff82000-04-01 11:09:21 +10001590 memset(data, 0, data_len);
1591 xfree(data);
1592}
Ben Lindstrombba81212001-06-25 05:01:22 +00001593static void
Damien Miller630d6f42002-01-22 23:17:30 +11001594client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10001595{
Ben Lindstrom46c16222000-12-22 01:43:59 +00001596 u_int data_len;
Damien Millerb38eff82000-04-01 11:09:21 +10001597 char *data = packet_get_string(&data_len);
Damien Miller48b03fc2002-01-22 23:11:40 +11001598 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10001599 buffer_append(&stderr_buffer, data, data_len);
Damien Millerb38eff82000-04-01 11:09:21 +10001600 memset(data, 0, data_len);
1601 xfree(data);
1602}
Ben Lindstrombba81212001-06-25 05:01:22 +00001603static void
Damien Miller630d6f42002-01-22 23:17:30 +11001604client_input_exit_status(int type, u_int32_t seq, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10001605{
Damien Millerb38eff82000-04-01 11:09:21 +10001606 exit_status = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11001607 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10001608 /* Acknowledge the exit. */
1609 packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1610 packet_send();
1611 /*
1612 * Must wait for packet to be sent since we are
1613 * exiting the loop.
1614 */
1615 packet_write_wait();
1616 /* Flag that we want to exit. */
1617 quit_pending = 1;
1618}
Darren Tucker5dcdd212003-10-02 16:17:00 +10001619static void
1620client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1621{
1622 Channel *c = NULL;
1623 int remote_id, sock;
1624
1625 /* Read the remote channel number from the message. */
1626 remote_id = packet_get_int();
1627 packet_check_eom();
1628
1629 /*
1630 * Get a connection to the local authentication agent (this may again
1631 * get forwarded).
1632 */
1633 sock = ssh_get_authentication_socket();
1634
1635 /*
1636 * If we could not connect the agent, send an error message back to
1637 * the server. This should never happen unless the agent dies,
1638 * because authentication forwarding is only enabled if we have an
1639 * agent.
1640 */
1641 if (sock >= 0) {
1642 c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1643 -1, 0, 0, 0, "authentication agent connection", 1);
1644 c->remote_id = remote_id;
1645 c->force_drain = 1;
1646 }
1647 if (c == NULL) {
1648 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1649 packet_put_int(remote_id);
1650 } else {
1651 /* Send a confirmation to the remote host. */
1652 debug("Forwarding authentication connection.");
1653 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1654 packet_put_int(remote_id);
1655 packet_put_int(c->self);
1656 }
1657 packet_send();
1658}
Damien Millerb38eff82000-04-01 11:09:21 +10001659
Ben Lindstrombba81212001-06-25 05:01:22 +00001660static Channel *
Damien Miller0bc1bd82000-11-13 22:57:25 +11001661client_request_forwarded_tcpip(const char *request_type, int rchan)
1662{
Ben Lindstroma962c2f2002-07-04 00:14:17 +00001663 Channel *c = NULL;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001664 char *listen_address, *originator_address;
1665 int listen_port, originator_port;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001666 int sock;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001667
1668 /* Get rest of the packet */
1669 listen_address = packet_get_string(NULL);
1670 listen_port = packet_get_int();
1671 originator_address = packet_get_string(NULL);
1672 originator_port = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11001673 packet_check_eom();
Damien Miller0bc1bd82000-11-13 22:57:25 +11001674
1675 debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d",
1676 listen_address, listen_port, originator_address, originator_port);
1677
Ben Lindstrom173e6462001-07-04 05:15:15 +00001678 sock = channel_connect_by_listen_address(listen_port);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001679 if (sock < 0) {
1680 xfree(originator_address);
1681 xfree(listen_address);
1682 return NULL;
1683 }
1684 c = channel_new("forwarded-tcpip",
1685 SSH_CHANNEL_CONNECTING, sock, sock, -1,
1686 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001687 originator_address, 1);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001688 xfree(originator_address);
1689 xfree(listen_address);
1690 return c;
1691}
1692
Ben Lindstroma962c2f2002-07-04 00:14:17 +00001693static Channel *
Damien Miller0bc1bd82000-11-13 22:57:25 +11001694client_request_x11(const char *request_type, int rchan)
1695{
1696 Channel *c = NULL;
1697 char *originator;
1698 int originator_port;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001699 int sock;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001700
1701 if (!options.forward_x11) {
1702 error("Warning: ssh server tried X11 forwarding.");
Damien Miller5eb137c2005-12-31 16:19:53 +11001703 error("Warning: this is probably a break-in attempt by a malicious server.");
Damien Miller0bc1bd82000-11-13 22:57:25 +11001704 return NULL;
1705 }
1706 originator = packet_get_string(NULL);
1707 if (datafellows & SSH_BUG_X11FWD) {
1708 debug2("buggy server: x11 request w/o originator_port");
1709 originator_port = 0;
1710 } else {
1711 originator_port = packet_get_int();
1712 }
Damien Miller48b03fc2002-01-22 23:11:40 +11001713 packet_check_eom();
Damien Miller0bc1bd82000-11-13 22:57:25 +11001714 /* XXX check permission */
Damien Millerd83ff352001-01-30 09:19:34 +11001715 debug("client_request_x11: request from %s %d", originator,
1716 originator_port);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001717 xfree(originator);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001718 sock = x11_connect_display();
1719 if (sock < 0)
1720 return NULL;
1721 c = channel_new("x11",
1722 SSH_CHANNEL_X11_OPEN, sock, sock, -1,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001723 CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
Ben Lindstrom944c4f02001-09-18 05:51:13 +00001724 c->force_drain = 1;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001725 return c;
1726}
1727
Ben Lindstroma962c2f2002-07-04 00:14:17 +00001728static Channel *
Damien Miller0bc1bd82000-11-13 22:57:25 +11001729client_request_agent(const char *request_type, int rchan)
1730{
1731 Channel *c = NULL;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001732 int sock;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001733
1734 if (!options.forward_agent) {
1735 error("Warning: ssh server tried agent forwarding.");
Damien Miller5eb137c2005-12-31 16:19:53 +11001736 error("Warning: this is probably a break-in attempt by a malicious server.");
Damien Miller0bc1bd82000-11-13 22:57:25 +11001737 return NULL;
1738 }
1739 sock = ssh_get_authentication_socket();
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001740 if (sock < 0)
1741 return NULL;
1742 c = channel_new("authentication agent connection",
1743 SSH_CHANNEL_OPEN, sock, sock, -1,
1744 CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001745 "authentication agent connection", 1);
Ben Lindstrom944c4f02001-09-18 05:51:13 +00001746 c->force_drain = 1;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001747 return c;
1748}
1749
Damien Millerbd483e72000-04-30 10:00:53 +10001750/* XXXX move to generic input handler */
Ben Lindstrombba81212001-06-25 05:01:22 +00001751static void
Damien Miller630d6f42002-01-22 23:17:30 +11001752client_input_channel_open(int type, u_int32_t seq, void *ctxt)
Damien Millerbd483e72000-04-30 10:00:53 +10001753{
1754 Channel *c = NULL;
1755 char *ctype;
Damien Millerbd483e72000-04-30 10:00:53 +10001756 int rchan;
Ben Lindstrom4fed2be2002-06-25 23:17:36 +00001757 u_int rmaxpack, rwindow, len;
Damien Millerbd483e72000-04-30 10:00:53 +10001758
1759 ctype = packet_get_string(&len);
1760 rchan = packet_get_int();
1761 rwindow = packet_get_int();
1762 rmaxpack = packet_get_int();
1763
Damien Millere247cc42000-05-07 12:03:14 +10001764 debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
Damien Millerbd483e72000-04-30 10:00:53 +10001765 ctype, rchan, rwindow, rmaxpack);
1766
Damien Miller0bc1bd82000-11-13 22:57:25 +11001767 if (strcmp(ctype, "forwarded-tcpip") == 0) {
1768 c = client_request_forwarded_tcpip(ctype, rchan);
1769 } else if (strcmp(ctype, "x11") == 0) {
1770 c = client_request_x11(ctype, rchan);
1771 } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1772 c = client_request_agent(ctype, rchan);
Damien Millerbd483e72000-04-30 10:00:53 +10001773 }
1774/* XXX duplicate : */
1775 if (c != NULL) {
1776 debug("confirm %s", ctype);
1777 c->remote_id = rchan;
1778 c->remote_window = rwindow;
1779 c->remote_maxpacket = rmaxpack;
Ben Lindstroma69d89b2001-05-09 00:01:18 +00001780 if (c->type != SSH_CHANNEL_CONNECTING) {
1781 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1782 packet_put_int(c->remote_id);
1783 packet_put_int(c->self);
1784 packet_put_int(c->local_window);
1785 packet_put_int(c->local_maxpacket);
1786 packet_send();
1787 }
Damien Millerbd483e72000-04-30 10:00:53 +10001788 } else {
1789 debug("failure %s", ctype);
1790 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1791 packet_put_int(rchan);
1792 packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
Ben Lindstromf3436742001-04-29 19:52:00 +00001793 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
Ben Lindstroma69d89b2001-05-09 00:01:18 +00001794 packet_put_cstring("open failed");
Ben Lindstromf3436742001-04-29 19:52:00 +00001795 packet_put_cstring("");
1796 }
Damien Millerbd483e72000-04-30 10:00:53 +10001797 packet_send();
1798 }
1799 xfree(ctype);
1800}
Ben Lindstrombba81212001-06-25 05:01:22 +00001801static void
Damien Miller630d6f42002-01-22 23:17:30 +11001802client_input_channel_req(int type, u_int32_t seq, void *ctxt)
Ben Lindstrom5b828322001-02-09 01:34:36 +00001803{
1804 Channel *c = NULL;
Damien Miller0e220db2004-06-15 10:34:08 +10001805 int exitval, id, reply, success = 0;
Ben Lindstrom5b828322001-02-09 01:34:36 +00001806 char *rtype;
1807
1808 id = packet_get_int();
1809 rtype = packet_get_string(NULL);
1810 reply = packet_get_char();
1811
1812 debug("client_input_channel_req: channel %d rtype %s reply %d",
1813 id, rtype, reply);
1814
Damien Miller3bbd8782004-06-18 22:23:22 +10001815 if (id == -1) {
1816 error("client_input_channel_req: request for channel -1");
1817 } else if ((c = channel_lookup(id)) == NULL) {
Ben Lindstrom5b828322001-02-09 01:34:36 +00001818 error("client_input_channel_req: channel %d: unknown channel", id);
1819 } else if (strcmp(rtype, "exit-status") == 0) {
Damien Miller0e220db2004-06-15 10:34:08 +10001820 exitval = packet_get_int();
1821 if (id == session_ident) {
1822 success = 1;
1823 exit_status = exitval;
1824 } else if (c->ctl_fd == -1) {
1825 error("client_input_channel_req: unexpected channel %d",
1826 session_ident);
1827 } else {
1828 atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1829 success = 1;
1830 }
Damien Miller48b03fc2002-01-22 23:11:40 +11001831 packet_check_eom();
Ben Lindstrom5b828322001-02-09 01:34:36 +00001832 }
1833 if (reply) {
1834 packet_start(success ?
1835 SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
Damien Miller3bbd8782004-06-18 22:23:22 +10001836 packet_put_int(id);
Ben Lindstrom5b828322001-02-09 01:34:36 +00001837 packet_send();
1838 }
1839 xfree(rtype);
1840}
Damien Millerc3fa4072002-01-22 23:21:58 +11001841static void
1842client_input_global_request(int type, u_int32_t seq, void *ctxt)
1843{
1844 char *rtype;
1845 int want_reply;
1846 int success = 0;
1847
1848 rtype = packet_get_string(NULL);
1849 want_reply = packet_get_char();
Damien Miller509b0102003-12-17 16:33:10 +11001850 debug("client_input_global_request: rtype %s want_reply %d",
1851 rtype, want_reply);
Damien Millerc3fa4072002-01-22 23:21:58 +11001852 if (want_reply) {
1853 packet_start(success ?
1854 SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1855 packet_send();
1856 packet_write_wait();
1857 }
1858 xfree(rtype);
1859}
Damien Millerbd483e72000-04-30 10:00:53 +10001860
Damien Miller0e220db2004-06-15 10:34:08 +10001861void
Darren Tuckerfc959702004-07-17 16:12:08 +10001862client_session2_setup(int id, int want_tty, int want_subsystem,
Damien Miller3756dce2004-06-18 01:17:29 +10001863 const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env,
Damien Miller0e220db2004-06-15 10:34:08 +10001864 dispatch_fn *subsys_repl)
1865{
1866 int len;
Darren Tucker5d78de62004-11-05 20:35:44 +11001867 Channel *c = NULL;
Damien Miller0e220db2004-06-15 10:34:08 +10001868
1869 debug2("%s: id %d", __func__, id);
1870
Darren Tucker5d78de62004-11-05 20:35:44 +11001871 if ((c = channel_lookup(id)) == NULL)
1872 fatal("client_session2_setup: channel %d: unknown channel", id);
1873
Damien Miller0e220db2004-06-15 10:34:08 +10001874 if (want_tty) {
1875 struct winsize ws;
1876 struct termios tio;
1877
1878 /* Store window size in the packet. */
1879 if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1880 memset(&ws, 0, sizeof(ws));
1881
1882 channel_request_start(id, "pty-req", 0);
1883 packet_put_cstring(term != NULL ? term : "");
1884 packet_put_int(ws.ws_col);
1885 packet_put_int(ws.ws_row);
1886 packet_put_int(ws.ws_xpixel);
1887 packet_put_int(ws.ws_ypixel);
1888 tio = get_saved_tio();
1889 tty_make_modes(-1, tiop != NULL ? tiop : &tio);
1890 packet_send();
1891 /* XXX wait for reply */
Darren Tucker5d78de62004-11-05 20:35:44 +11001892 c->client_tty = 1;
Damien Miller0e220db2004-06-15 10:34:08 +10001893 }
1894
1895 /* Transfer any environment variables from client to server */
Damien Miller3756dce2004-06-18 01:17:29 +10001896 if (options.num_send_env != 0 && env != NULL) {
Damien Miller0e220db2004-06-15 10:34:08 +10001897 int i, j, matched;
Damien Miller0e220db2004-06-15 10:34:08 +10001898 char *name, *val;
1899
1900 debug("Sending environment.");
Damien Miller3756dce2004-06-18 01:17:29 +10001901 for (i = 0; env[i] != NULL; i++) {
Damien Miller0e220db2004-06-15 10:34:08 +10001902 /* Split */
Damien Miller3756dce2004-06-18 01:17:29 +10001903 name = xstrdup(env[i]);
Damien Miller0e220db2004-06-15 10:34:08 +10001904 if ((val = strchr(name, '=')) == NULL) {
Damien Miller0a0176e2005-11-05 15:07:59 +11001905 xfree(name);
Damien Miller0e220db2004-06-15 10:34:08 +10001906 continue;
1907 }
1908 *val++ = '\0';
1909
1910 matched = 0;
1911 for (j = 0; j < options.num_send_env; j++) {
1912 if (match_pattern(name, options.send_env[j])) {
1913 matched = 1;
1914 break;
1915 }
1916 }
1917 if (!matched) {
1918 debug3("Ignored env %s", name);
Damien Miller0a0176e2005-11-05 15:07:59 +11001919 xfree(name);
Damien Miller0e220db2004-06-15 10:34:08 +10001920 continue;
1921 }
1922
1923 debug("Sending env %s = %s", name, val);
1924 channel_request_start(id, "env", 0);
1925 packet_put_cstring(name);
1926 packet_put_cstring(val);
1927 packet_send();
Damien Miller0a0176e2005-11-05 15:07:59 +11001928 xfree(name);
Damien Miller0e220db2004-06-15 10:34:08 +10001929 }
1930 }
1931
1932 len = buffer_len(cmd);
1933 if (len > 0) {
1934 if (len > 900)
1935 len = 900;
1936 if (want_subsystem) {
1937 debug("Sending subsystem: %.*s", len, (u_char*)buffer_ptr(cmd));
1938 channel_request_start(id, "subsystem", subsys_repl != NULL);
1939 if (subsys_repl != NULL) {
1940 /* register callback for reply */
1941 /* XXX we assume that client_loop has already been called */
1942 dispatch_set(SSH2_MSG_CHANNEL_FAILURE, subsys_repl);
1943 dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, subsys_repl);
1944 }
1945 } else {
1946 debug("Sending command: %.*s", len, (u_char*)buffer_ptr(cmd));
1947 channel_request_start(id, "exec", 0);
1948 }
1949 packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
1950 packet_send();
1951 } else {
1952 channel_request_start(id, "shell", 0);
1953 packet_send();
1954 }
1955}
1956
Ben Lindstrombba81212001-06-25 05:01:22 +00001957static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00001958client_init_dispatch_20(void)
Damien Miller1383bd82000-04-06 12:32:37 +10001959{
Ben Lindstrom8ac91062001-04-04 17:57:54 +00001960 dispatch_init(&dispatch_protocol_error);
Damien Miller2797f7f2002-04-23 21:09:44 +10001961
Damien Miller1383bd82000-04-06 12:32:37 +10001962 dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1963 dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1964 dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1965 dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
Damien Millerbd483e72000-04-30 10:00:53 +10001966 dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
Damien Miller1383bd82000-04-06 12:32:37 +10001967 dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1968 dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
Ben Lindstrom5b828322001-02-09 01:34:36 +00001969 dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
Damien Miller1383bd82000-04-06 12:32:37 +10001970 dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
Damien Millerc3fa4072002-01-22 23:21:58 +11001971 dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
Ben Lindstrom8ac91062001-04-04 17:57:54 +00001972
1973 /* rekeying */
1974 dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
Damien Miller2797f7f2002-04-23 21:09:44 +10001975
1976 /* global request reply messages */
1977 dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
1978 dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
Damien Miller1383bd82000-04-06 12:32:37 +10001979}
Ben Lindstrombba81212001-06-25 05:01:22 +00001980static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00001981client_init_dispatch_13(void)
Damien Millerb38eff82000-04-01 11:09:21 +10001982{
1983 dispatch_init(NULL);
1984 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
1985 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
1986 dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
Damien Millerb38eff82000-04-01 11:09:21 +10001987 dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1988 dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1989 dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
Damien Millerb38eff82000-04-01 11:09:21 +10001990 dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
1991 dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
1992 dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
Damien Miller69b69aa2000-10-28 14:19:58 +11001993
1994 dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
Darren Tucker5dcdd212003-10-02 16:17:00 +10001995 &client_input_agent_open : &deny_input_open);
Damien Miller69b69aa2000-10-28 14:19:58 +11001996 dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
1997 &x11_input_open : &deny_input_open);
Damien Millerb38eff82000-04-01 11:09:21 +10001998}
Ben Lindstrombba81212001-06-25 05:01:22 +00001999static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00002000client_init_dispatch_15(void)
Damien Millerb38eff82000-04-01 11:09:21 +10002001{
2002 client_init_dispatch_13();
2003 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
2004 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
2005}
Ben Lindstromdb47f382001-07-04 05:10:27 +00002006static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00002007client_init_dispatch(void)
Damien Millerb38eff82000-04-01 11:09:21 +10002008{
Damien Miller1383bd82000-04-06 12:32:37 +10002009 if (compat20)
2010 client_init_dispatch_20();
2011 else if (compat13)
Damien Millerb38eff82000-04-01 11:09:21 +10002012 client_init_dispatch_13();
2013 else
2014 client_init_dispatch_15();
2015}
Darren Tucker9a2c4cd2003-09-22 21:16:05 +10002016
2017/* client specific fatal cleanup */
2018void
Darren Tucker3e33cec2003-10-02 16:12:36 +10002019cleanup_exit(int i)
Darren Tucker9a2c4cd2003-09-22 21:16:05 +10002020{
Darren Tucker9a2c4cd2003-09-22 21:16:05 +10002021 leave_raw_mode();
2022 leave_non_blocking();
Damien Miller0e220db2004-06-15 10:34:08 +10002023 if (options.control_path != NULL && control_fd != -1)
2024 unlink(options.control_path);
Darren Tucker3e33cec2003-10-02 16:12:36 +10002025 _exit(i);
Darren Tucker9a2c4cd2003-09-22 21:16:05 +10002026}