blob: 04f2d11bee302e60503a1cf88767fb254be5d0cf [file] [log] [blame]
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001/*
Damien Miller95def091999-11-25 00:26:21 +11002 * Author: Tatu Ylonen <ylo@cs.hut.fi>
Damien Miller95def091999-11-25 00:26:21 +11003 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4 * All rights reserved
Damien Miller95def091999-11-25 00:26:21 +11005 * The main loop for the interactive session (client side).
Damien Miller4af51302000-04-16 11:18:38 +10006 *
Damien Millere4340be2000-09-16 13:29:08 +11007 * As far as I am concerned, the code I have written for this software
8 * can be used freely for any purpose. Any derived versions of this
9 * software must be clearly marked as such, and if the derived work is
10 * incompatible with the protocol description in the RFC file, it must be
11 * called by a name other than "ssh" or "Secure Shell".
12 *
13 *
14 * Copyright (c) 1999 Theo de Raadt. All rights reserved.
15 *
16 * Redistribution and use in source and binary forms, with or without
17 * modification, are permitted provided that the following conditions
18 * are met:
19 * 1. Redistributions of source code must retain the above copyright
20 * notice, this list of conditions and the following disclaimer.
21 * 2. Redistributions in binary form must reproduce the above copyright
22 * notice, this list of conditions and the following disclaimer in the
23 * documentation and/or other materials provided with the distribution.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
26 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
27 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
28 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
29 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
30 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
31 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
32 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
33 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
34 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35 *
36 *
Damien Miller1383bd82000-04-06 12:32:37 +100037 * SSH2 support added by Markus Friedl.
Ben Lindstrom44697232001-07-04 03:32:30 +000038 * Copyright (c) 1999, 2000, 2001 Markus Friedl. All rights reserved.
Damien Millere4340be2000-09-16 13:29:08 +110039 *
40 * Redistribution and use in source and binary forms, with or without
41 * modification, are permitted provided that the following conditions
42 * are met:
43 * 1. Redistributions of source code must retain the above copyright
44 * notice, this list of conditions and the following disclaimer.
45 * 2. Redistributions in binary form must reproduce the above copyright
46 * notice, this list of conditions and the following disclaimer in the
47 * documentation and/or other materials provided with the distribution.
48 *
49 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
50 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
51 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
52 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
53 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
54 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
55 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
56 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
57 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
58 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Damien Miller95def091999-11-25 00:26:21 +110059 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100060
61#include "includes.h"
Damien Milleraeb31d62005-12-13 19:29:36 +110062RCSID("$OpenBSD: clientloop.c,v 1.147 2005/12/07 03:52:22 djm Exp $");
Damien Millerd4a8b7e1999-10-27 13:42:43 +100063
Damien Millerd4a8b7e1999-10-27 13:42:43 +100064#include "ssh.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000065#include "ssh1.h"
66#include "ssh2.h"
67#include "xmalloc.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100068#include "packet.h"
69#include "buffer.h"
Damien Millerb38eff82000-04-01 11:09:21 +100070#include "compat.h"
Ben Lindstromc7637672001-06-09 00:36:26 +000071#include "channels.h"
Damien Millerb38eff82000-04-01 11:09:21 +100072#include "dispatch.h"
Damien Millerad833b32000-08-23 10:46:23 +100073#include "buffer.h"
74#include "bufaux.h"
Damien Miller0bc1bd82000-11-13 22:57:25 +110075#include "key.h"
Ben Lindstromf28f6342001-04-04 02:03:04 +000076#include "kex.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000077#include "log.h"
78#include "readconf.h"
Ben Lindstrombf555ba2001-01-18 02:04:35 +000079#include "clientloop.h"
Damien Milleraeb31d62005-12-13 19:29:36 +110080#include "sshconnect.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000081#include "authfd.h"
82#include "atomicio.h"
Darren Tucker06f2bd82004-05-13 16:06:46 +100083#include "sshpty.h"
Ben Lindstrom302ea6f2001-04-16 02:01:25 +000084#include "misc.h"
Damien Miller0e220db2004-06-15 10:34:08 +100085#include "monitor_fdpass.h"
86#include "match.h"
87#include "msg.h"
Damien Miller69b69aa2000-10-28 14:19:58 +110088
89/* import options */
90extern Options options;
91
Damien Millerd4a8b7e1999-10-27 13:42:43 +100092/* Flag indicating that stdin should be redirected from /dev/null. */
93extern int stdin_null_flag;
94
Damien Millerd6965512003-12-17 16:31:53 +110095/* Flag indicating that no shell has been requested */
96extern int no_shell_flag;
97
Damien Miller0e220db2004-06-15 10:34:08 +100098/* Control socket */
99extern int control_fd;
100
Damien Miller5428f641999-11-25 11:54:57 +1100101/*
102 * Name of the host we are connecting to. This is the name given on the
103 * command line, or the HostName specified for the user-supplied name in a
104 * configuration file.
105 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000106extern char *host;
107
Damien Miller5428f641999-11-25 11:54:57 +1100108/*
109 * Flag to indicate that we have received a window change signal which has
110 * not yet been processed. This will cause a message indicating the new
111 * window size to be sent to the server a little later. This is volatile
112 * because this is updated in a signal handler.
113 */
Ben Lindstrom5e71c542001-12-06 16:48:14 +0000114static volatile sig_atomic_t received_window_change_signal = 0;
115static volatile sig_atomic_t received_signal = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000116
Damien Miller788f2122005-11-05 15:14:59 +1100117/* Flag indicating whether the user's terminal is in non-blocking mode. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000118static int in_non_blocking_mode = 0;
119
120/* Common data for the client loop code. */
Damien Millerad833b32000-08-23 10:46:23 +1000121static int quit_pending; /* Set to non-zero to quit the client loop. */
122static int escape_char; /* Escape character. */
Damien Miller95def091999-11-25 00:26:21 +1100123static int escape_pending; /* Last character was the escape character */
124static int last_was_cr; /* Last character was a newline. */
125static int exit_status; /* Used to store the exit status of the command. */
126static int stdin_eof; /* EOF has been encountered on standard error. */
127static Buffer stdin_buffer; /* Buffer for stdin data. */
128static Buffer stdout_buffer; /* Buffer for stdout data. */
129static Buffer stderr_buffer; /* Buffer for stderr data. */
Ben Lindstrom46c16222000-12-22 01:43:59 +0000130static u_long stdin_bytes, stdout_bytes, stderr_bytes;
131static u_int buffer_high;/* Soft max buffer size. */
Damien Miller95def091999-11-25 00:26:21 +1100132static int connection_in; /* Connection to server (input). */
133static int connection_out; /* Connection to server (output). */
Ben Lindstrombe2cc432001-04-04 23:46:07 +0000134static int need_rekeying; /* Set to non-zero if rekeying is requested. */
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +0000135static int session_closed = 0; /* In SSH2: login session closed. */
Damien Miller509b0102003-12-17 16:33:10 +1100136static int server_alive_timeouts = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000137
Ben Lindstrombba81212001-06-25 05:01:22 +0000138static void client_init_dispatch(void);
Damien Miller1383bd82000-04-06 12:32:37 +1000139int session_ident = -1;
140
Damien Miller0e220db2004-06-15 10:34:08 +1000141struct confirm_ctx {
142 int want_tty;
143 int want_subsys;
Damien Miller13390022005-07-06 09:44:19 +1000144 int want_x_fwd;
145 int want_agent_fwd;
Damien Miller0e220db2004-06-15 10:34:08 +1000146 Buffer cmd;
147 char *term;
148 struct termios tio;
Damien Miller3756dce2004-06-18 01:17:29 +1000149 char **env;
Damien Miller0e220db2004-06-15 10:34:08 +1000150};
151
Ben Lindstromf28f6342001-04-04 02:03:04 +0000152/*XXX*/
153extern Kex *xxx_kex;
154
Damien Miller0e220db2004-06-15 10:34:08 +1000155void ssh_process_session2_setup(int, int, int, Buffer *);
156
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000157/* Restores stdin to blocking mode. */
158
Ben Lindstrombba81212001-06-25 05:01:22 +0000159static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000160leave_non_blocking(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000161{
Damien Miller95def091999-11-25 00:26:21 +1100162 if (in_non_blocking_mode) {
Damien Miller03e66f62004-06-15 15:47:51 +1000163 unset_nonblock(fileno(stdin));
Damien Miller95def091999-11-25 00:26:21 +1100164 in_non_blocking_mode = 0;
Damien Miller95def091999-11-25 00:26:21 +1100165 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000166}
167
Damien Miller95def091999-11-25 00:26:21 +1100168/* Puts stdin terminal in non-blocking mode. */
169
Ben Lindstrombba81212001-06-25 05:01:22 +0000170static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000171enter_non_blocking(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000172{
Damien Miller95def091999-11-25 00:26:21 +1100173 in_non_blocking_mode = 1;
Damien Miller232711f2004-06-15 10:35:30 +1000174 set_nonblock(fileno(stdin));
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000175}
176
Damien Miller5428f641999-11-25 11:54:57 +1100177/*
178 * Signal handler for the window change signal (SIGWINCH). This just sets a
179 * flag indicating that the window has changed.
180 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000181
Ben Lindstrombba81212001-06-25 05:01:22 +0000182static void
Damien Miller95def091999-11-25 00:26:21 +1100183window_change_handler(int sig)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000184{
Damien Miller95def091999-11-25 00:26:21 +1100185 received_window_change_signal = 1;
186 signal(SIGWINCH, window_change_handler);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000187}
188
Damien Miller5428f641999-11-25 11:54:57 +1100189/*
190 * Signal handler for signals that cause the program to terminate. These
191 * signals must be trapped to restore terminal modes.
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 +1100195signal_handler(int sig)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000196{
Ben Lindstromec46e0b2001-06-09 01:27:31 +0000197 received_signal = sig;
198 quit_pending = 1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000199}
200
Damien Miller5428f641999-11-25 11:54:57 +1100201/*
202 * Returns current time in seconds from Jan 1, 1970 with the maximum
203 * available resolution.
204 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000205
Ben Lindstrombba81212001-06-25 05:01:22 +0000206static double
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000207get_current_time(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000208{
Damien Miller95def091999-11-25 00:26:21 +1100209 struct timeval tv;
210 gettimeofday(&tv, NULL);
211 return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000212}
213
Damien Miller17e7ed02005-06-17 12:54:33 +1000214#define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
215void
216client_x11_get_proto(const char *display, const char *xauth_path,
217 u_int trusted, char **_proto, char **_data)
218{
219 char cmd[1024];
220 char line[512];
221 char xdisplay[512];
222 static char proto[512], data[512];
223 FILE *f;
224 int got_data = 0, generated = 0, do_unlink = 0, i;
225 char *xauthdir, *xauthfile;
226 struct stat st;
227
228 xauthdir = xauthfile = NULL;
229 *_proto = proto;
230 *_data = data;
231 proto[0] = data[0] = '\0';
232
233 if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
234 debug("No xauth program.");
235 } else {
236 if (display == NULL) {
237 debug("x11_get_proto: DISPLAY not set");
238 return;
239 }
240 /*
241 * Handle FamilyLocal case where $DISPLAY does
242 * not match an authorization entry. For this we
243 * just try "xauth list unix:displaynum.screennum".
244 * XXX: "localhost" match to determine FamilyLocal
245 * is not perfect.
246 */
247 if (strncmp(display, "localhost:", 10) == 0) {
248 snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
249 display + 10);
250 display = xdisplay;
251 }
252 if (trusted == 0) {
253 xauthdir = xmalloc(MAXPATHLEN);
254 xauthfile = xmalloc(MAXPATHLEN);
255 strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
256 if (mkdtemp(xauthdir) != NULL) {
257 do_unlink = 1;
258 snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
259 xauthdir);
260 snprintf(cmd, sizeof(cmd),
261 "%s -f %s generate %s " SSH_X11_PROTO
262 " untrusted timeout 1200 2>" _PATH_DEVNULL,
263 xauth_path, xauthfile, display);
264 debug2("x11_get_proto: %s", cmd);
265 if (system(cmd) == 0)
266 generated = 1;
267 }
268 }
269 snprintf(cmd, sizeof(cmd),
Darren Tuckerd89dbf22005-10-03 18:05:26 +1000270 "%s %s%s list %s 2>" _PATH_DEVNULL,
Damien Miller17e7ed02005-06-17 12:54:33 +1000271 xauth_path,
272 generated ? "-f " : "" ,
273 generated ? xauthfile : "",
274 display);
275 debug2("x11_get_proto: %s", cmd);
276 f = popen(cmd, "r");
277 if (f && fgets(line, sizeof(line), f) &&
278 sscanf(line, "%*s %511s %511s", proto, data) == 2)
279 got_data = 1;
280 if (f)
281 pclose(f);
282 }
283
284 if (do_unlink) {
285 unlink(xauthfile);
286 rmdir(xauthdir);
287 }
288 if (xauthdir)
289 xfree(xauthdir);
290 if (xauthfile)
291 xfree(xauthfile);
292
293 /*
294 * If we didn't get authentication data, just make up some
295 * data. The forwarding code will check the validity of the
296 * response anyway, and substitute this data. The X11
297 * server, however, will ignore this fake data and use
298 * whatever authentication mechanisms it was using otherwise
299 * for the local connection.
300 */
301 if (!got_data) {
302 u_int32_t rnd = 0;
303
304 logit("Warning: No xauth data; "
305 "using fake authentication data for X11 forwarding.");
306 strlcpy(proto, SSH_X11_PROTO, sizeof proto);
307 for (i = 0; i < 16; i++) {
308 if (i % 4 == 0)
309 rnd = arc4random();
310 snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
311 rnd & 0xff);
312 rnd >>= 8;
313 }
314 }
315}
316
Damien Miller5428f641999-11-25 11:54:57 +1100317/*
318 * This is called when the interactive is entered. This checks if there is
319 * an EOF coming on stdin. We must check this explicitly, as select() does
320 * not appear to wake up when redirecting from /dev/null.
321 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000322
Ben Lindstrombba81212001-06-25 05:01:22 +0000323static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000324client_check_initial_eof_on_stdin(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000325{
Damien Miller95def091999-11-25 00:26:21 +1100326 int len;
327 char buf[1];
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000328
Damien Miller5428f641999-11-25 11:54:57 +1100329 /*
330 * If standard input is to be "redirected from /dev/null", we simply
331 * mark that we have seen an EOF and send an EOF message to the
332 * server. Otherwise, we try to read a single character; it appears
333 * that for some files, such /dev/null, select() never wakes up for
334 * read for this descriptor, which means that we never get EOF. This
335 * way we will get the EOF if stdin comes from /dev/null or similar.
336 */
Damien Miller95def091999-11-25 00:26:21 +1100337 if (stdin_null_flag) {
338 /* Fake EOF on stdin. */
339 debug("Sending eof.");
340 stdin_eof = 1;
341 packet_start(SSH_CMSG_EOF);
342 packet_send();
343 } else {
Damien Miller95def091999-11-25 00:26:21 +1100344 enter_non_blocking();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000345
Damien Miller95def091999-11-25 00:26:21 +1100346 /* Check for immediate EOF on stdin. */
347 len = read(fileno(stdin), buf, 1);
348 if (len == 0) {
Damien Miller5428f641999-11-25 11:54:57 +1100349 /* EOF. Record that we have seen it and send EOF to server. */
Damien Miller95def091999-11-25 00:26:21 +1100350 debug("Sending eof.");
351 stdin_eof = 1;
352 packet_start(SSH_CMSG_EOF);
353 packet_send();
354 } else if (len > 0) {
Damien Miller5428f641999-11-25 11:54:57 +1100355 /*
356 * Got data. We must store the data in the buffer,
357 * and also process it as an escape character if
358 * appropriate.
359 */
Ben Lindstrom46c16222000-12-22 01:43:59 +0000360 if ((u_char) buf[0] == escape_char)
Damien Miller95def091999-11-25 00:26:21 +1100361 escape_pending = 1;
Ben Lindstrome9613cf2001-03-05 06:14:02 +0000362 else
Damien Miller95def091999-11-25 00:26:21 +1100363 buffer_append(&stdin_buffer, buf, 1);
Damien Miller95def091999-11-25 00:26:21 +1100364 }
Damien Miller95def091999-11-25 00:26:21 +1100365 leave_non_blocking();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000366 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000367}
368
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000369
Damien Miller5428f641999-11-25 11:54:57 +1100370/*
371 * Make packets from buffered stdin data, and buffer them for sending to the
372 * connection.
373 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000374
Ben Lindstrombba81212001-06-25 05:01:22 +0000375static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000376client_make_packets_from_stdin_data(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000377{
Ben Lindstrom46c16222000-12-22 01:43:59 +0000378 u_int len;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000379
Damien Miller95def091999-11-25 00:26:21 +1100380 /* Send buffered stdin data to the server. */
381 while (buffer_len(&stdin_buffer) > 0 &&
Damien Miller9f0f5c62001-12-21 14:45:46 +1100382 packet_not_very_much_data_to_write()) {
Damien Miller95def091999-11-25 00:26:21 +1100383 len = buffer_len(&stdin_buffer);
384 /* Keep the packets at reasonable size. */
385 if (len > packet_get_maxsize())
386 len = packet_get_maxsize();
387 packet_start(SSH_CMSG_STDIN_DATA);
388 packet_put_string(buffer_ptr(&stdin_buffer), len);
389 packet_send();
390 buffer_consume(&stdin_buffer, len);
Ben Lindstrome9613cf2001-03-05 06:14:02 +0000391 stdin_bytes += len;
Damien Miller95def091999-11-25 00:26:21 +1100392 /* If we have a pending EOF, send it now. */
393 if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
394 packet_start(SSH_CMSG_EOF);
395 packet_send();
396 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000397 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000398}
399
Damien Miller5428f641999-11-25 11:54:57 +1100400/*
401 * Checks if the client window has changed, and sends a packet about it to
402 * the server if so. The actual change is detected elsewhere (by a software
403 * interrupt on Unix); this just checks the flag and sends a message if
404 * appropriate.
405 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000406
Ben Lindstrombba81212001-06-25 05:01:22 +0000407static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000408client_check_window_change(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000409{
Damien Miller1383bd82000-04-06 12:32:37 +1000410 struct winsize ws;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000411
Damien Miller1383bd82000-04-06 12:32:37 +1000412 if (! received_window_change_signal)
413 return;
414 /** XXX race */
415 received_window_change_signal = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000416
Damien Millerd3444942000-09-30 14:20:03 +1100417 debug2("client_check_window_change: changed");
Damien Miller1383bd82000-04-06 12:32:37 +1000418
419 if (compat20) {
Damien Miller0e220db2004-06-15 10:34:08 +1000420 channel_send_window_changes();
Damien Miller1383bd82000-04-06 12:32:37 +1000421 } else {
Damien Miller0e220db2004-06-15 10:34:08 +1000422 if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
423 return;
Damien Miller1383bd82000-04-06 12:32:37 +1000424 packet_start(SSH_CMSG_WINDOW_SIZE);
425 packet_put_int(ws.ws_row);
426 packet_put_int(ws.ws_col);
427 packet_put_int(ws.ws_xpixel);
428 packet_put_int(ws.ws_ypixel);
429 packet_send();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000430 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000431}
432
Damien Miller509b0102003-12-17 16:33:10 +1100433static void
434client_global_request_reply(int type, u_int32_t seq, void *ctxt)
435{
436 server_alive_timeouts = 0;
437 client_global_request_reply_fwd(type, seq, ctxt);
438}
439
440static void
441server_alive_check(void)
442{
443 if (++server_alive_timeouts > options.server_alive_count_max)
444 packet_disconnect("Timeout, server not responding.");
445 packet_start(SSH2_MSG_GLOBAL_REQUEST);
446 packet_put_cstring("keepalive@openssh.com");
447 packet_put_char(1); /* boolean: want reply */
448 packet_send();
449}
450
Damien Miller5428f641999-11-25 11:54:57 +1100451/*
452 * Waits until the client can do something (some data becomes available on
453 * one of the file descriptors).
454 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000455static void
Damien Miller5e953212001-01-30 09:14:00 +1100456client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000457 int *maxfdp, u_int *nallocp, int rekeying)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000458{
Damien Miller509b0102003-12-17 16:33:10 +1100459 struct timeval tv, *tvp;
460 int ret;
461
Damien Miller5e953212001-01-30 09:14:00 +1100462 /* Add any selections by the channel mechanism. */
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000463 channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000464
Damien Miller1383bd82000-04-06 12:32:37 +1000465 if (!compat20) {
466 /* Read from the connection, unless our buffers are full. */
467 if (buffer_len(&stdout_buffer) < buffer_high &&
468 buffer_len(&stderr_buffer) < buffer_high &&
469 channel_not_very_much_buffered_data())
Damien Miller5e953212001-01-30 09:14:00 +1100470 FD_SET(connection_in, *readsetp);
Damien Miller1383bd82000-04-06 12:32:37 +1000471 /*
472 * Read from stdin, unless we have seen EOF or have very much
473 * buffered data to send to the server.
474 */
475 if (!stdin_eof && packet_not_very_much_data_to_write())
Damien Miller5e953212001-01-30 09:14:00 +1100476 FD_SET(fileno(stdin), *readsetp);
Damien Miller1383bd82000-04-06 12:32:37 +1000477
478 /* Select stdout/stderr if have data in buffer. */
479 if (buffer_len(&stdout_buffer) > 0)
Damien Miller5e953212001-01-30 09:14:00 +1100480 FD_SET(fileno(stdout), *writesetp);
Damien Miller1383bd82000-04-06 12:32:37 +1000481 if (buffer_len(&stderr_buffer) > 0)
Damien Miller5e953212001-01-30 09:14:00 +1100482 FD_SET(fileno(stderr), *writesetp);
Damien Miller1383bd82000-04-06 12:32:37 +1000483 } else {
Ben Lindstromc8b3f472001-05-17 03:19:40 +0000484 /* channel_prepare_select could have closed the last channel */
Damien Miller164a7f42001-10-12 11:36:09 +1000485 if (session_closed && !channel_still_open() &&
486 !packet_have_data_to_write()) {
487 /* clear mask since we did not call select() */
Damien Miller79faeff2001-11-12 11:06:32 +1100488 memset(*readsetp, 0, *nallocp);
489 memset(*writesetp, 0, *nallocp);
Damien Miller164a7f42001-10-12 11:36:09 +1000490 return;
Ben Lindstromc8b3f472001-05-17 03:19:40 +0000491 } else {
492 FD_SET(connection_in, *readsetp);
493 }
Damien Miller1383bd82000-04-06 12:32:37 +1000494 }
495
Damien Miller95def091999-11-25 00:26:21 +1100496 /* Select server connection if have data to write to the server. */
497 if (packet_have_data_to_write())
Damien Miller5e953212001-01-30 09:14:00 +1100498 FD_SET(connection_out, *writesetp);
Damien Miller95def091999-11-25 00:26:21 +1100499
Damien Miller0e220db2004-06-15 10:34:08 +1000500 if (control_fd != -1)
501 FD_SET(control_fd, *readsetp);
502
Damien Miller5428f641999-11-25 11:54:57 +1100503 /*
504 * Wait for something to happen. This will suspend the process until
505 * some selected descriptor can be read, written, or has some other
Damien Miller509b0102003-12-17 16:33:10 +1100506 * event pending.
Damien Miller5428f641999-11-25 11:54:57 +1100507 */
Damien Miller95def091999-11-25 00:26:21 +1100508
Damien Miller509b0102003-12-17 16:33:10 +1100509 if (options.server_alive_interval == 0 || !compat20)
510 tvp = NULL;
Darren Tuckerfc959702004-07-17 16:12:08 +1000511 else {
Damien Miller509b0102003-12-17 16:33:10 +1100512 tv.tv_sec = options.server_alive_interval;
513 tv.tv_usec = 0;
514 tvp = &tv;
515 }
516 ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
517 if (ret < 0) {
Damien Miller95def091999-11-25 00:26:21 +1100518 char buf[100];
Ben Lindstromf9452512001-02-15 03:12:08 +0000519
520 /*
521 * We have to clear the select masks, because we return.
522 * We have to return, because the mainloop checks for the flags
523 * set by the signal handlers.
524 */
Damien Miller79faeff2001-11-12 11:06:32 +1100525 memset(*readsetp, 0, *nallocp);
526 memset(*writesetp, 0, *nallocp);
Ben Lindstromf9452512001-02-15 03:12:08 +0000527
Damien Miller95def091999-11-25 00:26:21 +1100528 if (errno == EINTR)
529 return;
530 /* Note: we might still have data in the buffers. */
531 snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
532 buffer_append(&stderr_buffer, buf, strlen(buf));
Damien Miller95def091999-11-25 00:26:21 +1100533 quit_pending = 1;
Damien Miller509b0102003-12-17 16:33:10 +1100534 } else if (ret == 0)
535 server_alive_check();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000536}
537
Ben Lindstrombba81212001-06-25 05:01:22 +0000538static void
Damien Millerad833b32000-08-23 10:46:23 +1000539client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000540{
Damien Miller95def091999-11-25 00:26:21 +1100541 /* Flush stdout and stderr buffers. */
Damien Millerad833b32000-08-23 10:46:23 +1000542 if (buffer_len(bout) > 0)
Darren Tucker9f63f222003-07-03 13:46:56 +1000543 atomicio(vwrite, fileno(stdout), buffer_ptr(bout), buffer_len(bout));
Damien Millerad833b32000-08-23 10:46:23 +1000544 if (buffer_len(berr) > 0)
Darren Tucker9f63f222003-07-03 13:46:56 +1000545 atomicio(vwrite, fileno(stderr), buffer_ptr(berr), buffer_len(berr));
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000546
Damien Miller95def091999-11-25 00:26:21 +1100547 leave_raw_mode();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000548
Damien Miller5428f641999-11-25 11:54:57 +1100549 /*
550 * Free (and clear) the buffer to reduce the amount of data that gets
551 * written to swap.
552 */
Damien Millerad833b32000-08-23 10:46:23 +1000553 buffer_free(bin);
554 buffer_free(bout);
555 buffer_free(berr);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000556
Damien Miller95def091999-11-25 00:26:21 +1100557 /* Send the suspend signal to the program itself. */
558 kill(getpid(), SIGTSTP);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000559
Darren Tucker5d78de62004-11-05 20:35:44 +1100560 /* Reset window sizes in case they have changed */
561 received_window_change_signal = 1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000562
Damien Miller95def091999-11-25 00:26:21 +1100563 /* OK, we have been continued by the user. Reinitialize buffers. */
Damien Millerad833b32000-08-23 10:46:23 +1000564 buffer_init(bin);
565 buffer_init(bout);
566 buffer_init(berr);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000567
Damien Miller95def091999-11-25 00:26:21 +1100568 enter_raw_mode();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000569}
570
Ben Lindstrombba81212001-06-25 05:01:22 +0000571static void
Damien Miller1383bd82000-04-06 12:32:37 +1000572client_process_net_input(fd_set * readset)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000573{
Damien Miller1383bd82000-04-06 12:32:37 +1000574 int len;
575 char buf[8192];
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000576
Damien Miller5428f641999-11-25 11:54:57 +1100577 /*
578 * Read input from the server, and add any such data to the buffer of
579 * the packet subsystem.
580 */
Damien Miller95def091999-11-25 00:26:21 +1100581 if (FD_ISSET(connection_in, readset)) {
582 /* Read as much as possible. */
583 len = read(connection_in, buf, sizeof(buf));
584 if (len == 0) {
585 /* Received EOF. The remote host has closed the connection. */
586 snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n",
587 host);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000588 buffer_append(&stderr_buffer, buf, strlen(buf));
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000589 quit_pending = 1;
590 return;
Damien Miller95def091999-11-25 00:26:21 +1100591 }
Damien Miller5428f641999-11-25 11:54:57 +1100592 /*
593 * There is a kernel bug on Solaris that causes select to
594 * sometimes wake up even though there is no data available.
595 */
Ben Lindstromebc88272001-03-06 03:34:40 +0000596 if (len < 0 && (errno == EAGAIN || errno == EINTR))
Damien Miller95def091999-11-25 00:26:21 +1100597 len = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000598
Damien Miller95def091999-11-25 00:26:21 +1100599 if (len < 0) {
600 /* An error has encountered. Perhaps there is a network problem. */
601 snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n",
602 host, strerror(errno));
603 buffer_append(&stderr_buffer, buf, strlen(buf));
Damien Miller95def091999-11-25 00:26:21 +1100604 quit_pending = 1;
605 return;
606 }
607 packet_process_incoming(buf, len);
608 }
Damien Miller1383bd82000-04-06 12:32:37 +1000609}
610
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000611static void
Damien Miller0e220db2004-06-15 10:34:08 +1000612client_subsystem_reply(int type, u_int32_t seq, void *ctxt)
613{
614 int id;
615 Channel *c;
Darren Tuckerfc959702004-07-17 16:12:08 +1000616
Damien Miller0e220db2004-06-15 10:34:08 +1000617 id = packet_get_int();
618 packet_check_eom();
619
620 if ((c = channel_lookup(id)) == NULL) {
621 error("%s: no channel for id %d", __func__, id);
622 return;
623 }
624
625 if (type == SSH2_MSG_CHANNEL_SUCCESS)
626 debug2("Request suceeded on channel %d", id);
627 else if (type == SSH2_MSG_CHANNEL_FAILURE) {
628 error("Request failed on channel %d", id);
629 channel_free(c);
630 }
631}
632
633static void
634client_extra_session2_setup(int id, void *arg)
635{
636 struct confirm_ctx *cctx = arg;
Damien Miller13390022005-07-06 09:44:19 +1000637 const char *display;
Damien Miller0e220db2004-06-15 10:34:08 +1000638 Channel *c;
Damien Miller3756dce2004-06-18 01:17:29 +1000639 int i;
Darren Tuckerfc959702004-07-17 16:12:08 +1000640
Damien Miller0e220db2004-06-15 10:34:08 +1000641 if (cctx == NULL)
642 fatal("%s: cctx == NULL", __func__);
643 if ((c = channel_lookup(id)) == NULL)
644 fatal("%s: no channel for id %d", __func__, id);
645
Damien Miller46d38de2005-07-17 17:02:09 +1000646 display = getenv("DISPLAY");
Damien Miller13390022005-07-06 09:44:19 +1000647 if (cctx->want_x_fwd && options.forward_x11 && display != NULL) {
648 char *proto, *data;
649 /* Get reasonable local authentication information. */
650 client_x11_get_proto(display, options.xauth_location,
651 options.forward_x11_trusted, &proto, &data);
652 /* Request forwarding with authentication spoofing. */
653 debug("Requesting X11 forwarding with authentication spoofing.");
654 x11_request_forwarding_with_spoofing(id, display, proto, data);
655 /* XXX wait for reply */
656 }
657
658 if (cctx->want_agent_fwd && options.forward_agent) {
659 debug("Requesting authentication agent forwarding.");
660 channel_request_start(id, "auth-agent-req@openssh.com", 0);
661 packet_send();
662 }
663
Darren Tuckerfc959702004-07-17 16:12:08 +1000664 client_session2_setup(id, cctx->want_tty, cctx->want_subsys,
Damien Miller3756dce2004-06-18 01:17:29 +1000665 cctx->term, &cctx->tio, c->rfd, &cctx->cmd, cctx->env,
Damien Miller0e220db2004-06-15 10:34:08 +1000666 client_subsystem_reply);
Damien Miller23f07702004-06-18 01:19:03 +1000667
Damien Miller0e220db2004-06-15 10:34:08 +1000668 c->confirm_ctx = NULL;
669 buffer_free(&cctx->cmd);
Damien Miller3756dce2004-06-18 01:17:29 +1000670 xfree(cctx->term);
671 if (cctx->env != NULL) {
672 for (i = 0; cctx->env[i] != NULL; i++)
673 xfree(cctx->env[i]);
674 xfree(cctx->env);
Darren Tuckerfc959702004-07-17 16:12:08 +1000675 }
Damien Miller3756dce2004-06-18 01:17:29 +1000676 xfree(cctx);
Damien Miller0e220db2004-06-15 10:34:08 +1000677}
678
679static void
680client_process_control(fd_set * readset)
681{
682 Buffer m;
683 Channel *c;
Damien Millereccb9de2005-06-17 12:59:34 +1000684 int client_fd, new_fd[3], ver, allowed;
Damien Miller0e220db2004-06-15 10:34:08 +1000685 socklen_t addrlen;
686 struct sockaddr_storage addr;
687 struct confirm_ctx *cctx;
688 char *cmd;
Damien Millereccb9de2005-06-17 12:59:34 +1000689 u_int i, len, env_len, command, flags;
Damien Miller0e220db2004-06-15 10:34:08 +1000690 uid_t euid;
691 gid_t egid;
692
693 /*
694 * Accept connection on control socket
695 */
696 if (control_fd == -1 || !FD_ISSET(control_fd, readset))
697 return;
698
699 memset(&addr, 0, sizeof(addr));
700 addrlen = sizeof(addr);
701 if ((client_fd = accept(control_fd,
702 (struct sockaddr*)&addr, &addrlen)) == -1) {
703 error("%s accept: %s", __func__, strerror(errno));
704 return;
705 }
706
707 if (getpeereid(client_fd, &euid, &egid) < 0) {
708 error("%s getpeereid failed: %s", __func__, strerror(errno));
709 close(client_fd);
710 return;
711 }
712 if ((euid != 0) && (getuid() != euid)) {
713 error("control mode uid mismatch: peer euid %u != uid %u",
714 (u_int) euid, (u_int) getuid());
715 close(client_fd);
716 return;
717 }
Damien Miller23f07702004-06-18 01:19:03 +1000718
Damien Miller0e220db2004-06-15 10:34:08 +1000719 unset_nonblock(client_fd);
720
Darren Tucker7ebfc102004-11-07 20:06:19 +1100721 /* Read command */
Damien Miller0e220db2004-06-15 10:34:08 +1000722 buffer_init(&m);
Darren Tucker7ebfc102004-11-07 20:06:19 +1100723 if (ssh_msg_recv(client_fd, &m) == -1) {
724 error("%s: client msg_recv failed", __func__);
725 close(client_fd);
726 buffer_free(&m);
727 return;
728 }
Damien Miller13390022005-07-06 09:44:19 +1000729 if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
Darren Tucker7ebfc102004-11-07 20:06:19 +1100730 error("%s: wrong client version %d", __func__, ver);
731 buffer_free(&m);
732 close(client_fd);
733 return;
734 }
Damien Miller0e220db2004-06-15 10:34:08 +1000735
Darren Tucker7ebfc102004-11-07 20:06:19 +1100736 allowed = 1;
737 command = buffer_get_int(&m);
738 flags = buffer_get_int(&m);
739
740 buffer_clear(&m);
741
742 switch (command) {
743 case SSHMUX_COMMAND_OPEN:
Damien Millerd14b1e72005-06-16 13:19:41 +1000744 if (options.control_master == SSHCTL_MASTER_ASK ||
745 options.control_master == SSHCTL_MASTER_AUTO_ASK)
Darren Tucker7ebfc102004-11-07 20:06:19 +1100746 allowed = ask_permission("Allow shared connection "
747 "to %s? ", host);
748 /* continue below */
749 break;
750 case SSHMUX_COMMAND_TERMINATE:
Damien Millerd14b1e72005-06-16 13:19:41 +1000751 if (options.control_master == SSHCTL_MASTER_ASK ||
752 options.control_master == SSHCTL_MASTER_AUTO_ASK)
Darren Tucker7ebfc102004-11-07 20:06:19 +1100753 allowed = ask_permission("Terminate shared connection "
754 "to %s? ", host);
755 if (allowed)
756 quit_pending = 1;
Darren Tucker47eede72005-03-14 23:08:12 +1100757 /* FALLTHROUGH */
Darren Tucker7ebfc102004-11-07 20:06:19 +1100758 case SSHMUX_COMMAND_ALIVE_CHECK:
759 /* Reply for SSHMUX_COMMAND_TERMINATE and ALIVE_CHECK */
760 buffer_clear(&m);
761 buffer_put_int(&m, allowed);
762 buffer_put_int(&m, getpid());
Damien Miller13390022005-07-06 09:44:19 +1000763 if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
Darren Tucker7ebfc102004-11-07 20:06:19 +1100764 error("%s: client msg_send failed", __func__);
765 close(client_fd);
766 buffer_free(&m);
767 return;
768 }
769 buffer_free(&m);
770 close(client_fd);
771 return;
772 default:
773 error("Unsupported command %d", command);
774 buffer_free(&m);
775 close(client_fd);
776 return;
777 }
778
779 /* Reply for SSHMUX_COMMAND_OPEN */
780 buffer_clear(&m);
Damien Miller23f07702004-06-18 01:19:03 +1000781 buffer_put_int(&m, allowed);
Damien Miller0e220db2004-06-15 10:34:08 +1000782 buffer_put_int(&m, getpid());
Damien Miller13390022005-07-06 09:44:19 +1000783 if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
Damien Miller0e220db2004-06-15 10:34:08 +1000784 error("%s: client msg_send failed", __func__);
785 close(client_fd);
Damien Miller23f07702004-06-18 01:19:03 +1000786 buffer_free(&m);
Damien Miller0e220db2004-06-15 10:34:08 +1000787 return;
788 }
Damien Miller0e220db2004-06-15 10:34:08 +1000789
Damien Miller23f07702004-06-18 01:19:03 +1000790 if (!allowed) {
791 error("Refused control connection");
792 close(client_fd);
793 buffer_free(&m);
794 return;
795 }
796
Darren Tucker7ebfc102004-11-07 20:06:19 +1100797 buffer_clear(&m);
Damien Miller0e220db2004-06-15 10:34:08 +1000798 if (ssh_msg_recv(client_fd, &m) == -1) {
799 error("%s: client msg_recv failed", __func__);
800 close(client_fd);
Damien Miller23f07702004-06-18 01:19:03 +1000801 buffer_free(&m);
Damien Miller0e220db2004-06-15 10:34:08 +1000802 return;
803 }
Damien Miller13390022005-07-06 09:44:19 +1000804 if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
Damien Miller0e220db2004-06-15 10:34:08 +1000805 error("%s: wrong client version %d", __func__, ver);
806 buffer_free(&m);
807 close(client_fd);
808 return;
809 }
810
811 cctx = xmalloc(sizeof(*cctx));
812 memset(cctx, 0, sizeof(*cctx));
Darren Tucker7ebfc102004-11-07 20:06:19 +1100813 cctx->want_tty = (flags & SSHMUX_FLAG_TTY) != 0;
814 cctx->want_subsys = (flags & SSHMUX_FLAG_SUBSYS) != 0;
Damien Miller13390022005-07-06 09:44:19 +1000815 cctx->want_x_fwd = (flags & SSHMUX_FLAG_X11_FWD) != 0;
816 cctx->want_agent_fwd = (flags & SSHMUX_FLAG_AGENT_FWD) != 0;
Damien Miller0e220db2004-06-15 10:34:08 +1000817 cctx->term = buffer_get_string(&m, &len);
818
819 cmd = buffer_get_string(&m, &len);
820 buffer_init(&cctx->cmd);
821 buffer_append(&cctx->cmd, cmd, strlen(cmd));
822
Damien Miller3756dce2004-06-18 01:17:29 +1000823 env_len = buffer_get_int(&m);
824 env_len = MIN(env_len, 4096);
825 debug3("%s: receiving %d env vars", __func__, env_len);
826 if (env_len != 0) {
827 cctx->env = xmalloc(sizeof(*cctx->env) * (env_len + 1));
828 for (i = 0; i < env_len; i++)
829 cctx->env[i] = buffer_get_string(&m, &len);
830 cctx->env[i] = NULL;
831 }
832
Damien Miller0e220db2004-06-15 10:34:08 +1000833 debug2("%s: accepted tty %d, subsys %d, cmd %s", __func__,
834 cctx->want_tty, cctx->want_subsys, cmd);
835
836 /* Gather fds from client */
837 new_fd[0] = mm_receive_fd(client_fd);
838 new_fd[1] = mm_receive_fd(client_fd);
839 new_fd[2] = mm_receive_fd(client_fd);
840
841 debug2("%s: got fds stdin %d, stdout %d, stderr %d", __func__,
842 new_fd[0], new_fd[1], new_fd[2]);
843
844 /* Try to pick up ttymodes from client before it goes raw */
845 if (cctx->want_tty && tcgetattr(new_fd[0], &cctx->tio) == -1)
846 error("%s: tcgetattr: %s", __func__, strerror(errno));
847
Darren Tucker7ebfc102004-11-07 20:06:19 +1100848 /* This roundtrip is just for synchronisation of ttymodes */
Damien Miller0e220db2004-06-15 10:34:08 +1000849 buffer_clear(&m);
Damien Miller13390022005-07-06 09:44:19 +1000850 if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
Damien Miller0e220db2004-06-15 10:34:08 +1000851 error("%s: client msg_send failed", __func__);
852 close(client_fd);
853 close(new_fd[0]);
854 close(new_fd[1]);
855 close(new_fd[2]);
Damien Miller23f07702004-06-18 01:19:03 +1000856 buffer_free(&m);
Darren Tucker7ebfc102004-11-07 20:06:19 +1100857 xfree(cctx->term);
858 if (env_len != 0) {
859 for (i = 0; i < env_len; i++)
860 xfree(cctx->env[i]);
861 xfree(cctx->env);
862 }
Damien Miller0e220db2004-06-15 10:34:08 +1000863 return;
864 }
865 buffer_free(&m);
866
867 /* enable nonblocking unless tty */
868 if (!isatty(new_fd[0]))
869 set_nonblock(new_fd[0]);
870 if (!isatty(new_fd[1]))
871 set_nonblock(new_fd[1]);
872 if (!isatty(new_fd[2]))
873 set_nonblock(new_fd[2]);
874
875 set_nonblock(client_fd);
876
Darren Tuckerfc959702004-07-17 16:12:08 +1000877 c = channel_new("session", SSH_CHANNEL_OPENING,
Damien Miller0e220db2004-06-15 10:34:08 +1000878 new_fd[0], new_fd[1], new_fd[2],
879 CHAN_SES_WINDOW_DEFAULT, CHAN_SES_PACKET_DEFAULT,
880 CHAN_EXTENDED_WRITE, "client-session", /*nonblock*/0);
881
882 /* XXX */
883 c->ctl_fd = client_fd;
884
885 debug3("%s: channel_new: %d", __func__, c->self);
886
887 channel_send_open(c->self);
888 channel_register_confirm(c->self, client_extra_session2_setup, cctx);
889}
890
891static void
Ben Lindstrom681d9322002-03-22 03:53:00 +0000892process_cmdline(void)
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000893{
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000894 void (*handler)(int);
Damien Millerf91ee4c2005-03-01 21:24:33 +1100895 char *s, *cmd, *cancel_host;
Darren Tuckere7066df2004-05-24 10:18:05 +1000896 int delete = 0;
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000897 int local = 0;
Damien Millerf91ee4c2005-03-01 21:24:33 +1100898 u_short cancel_port;
899 Forward fwd;
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000900
901 leave_raw_mode();
Ben Lindstrom5a6abda2002-06-09 19:41:48 +0000902 handler = signal(SIGINT, SIG_IGN);
Ben Lindstrom681d9322002-03-22 03:53:00 +0000903 cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000904 if (s == NULL)
905 goto out;
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000906 while (*s && isspace(*s))
907 s++;
Darren Tuckere7066df2004-05-24 10:18:05 +1000908 if (*s == '-')
909 s++; /* Skip cmdline '-', if any */
Darren Tuckere1675822004-05-24 10:13:07 +1000910 if (*s == '\0')
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000911 goto out;
Darren Tuckere7066df2004-05-24 10:18:05 +1000912
Darren Tucker1973c882004-05-24 10:34:36 +1000913 if (*s == 'h' || *s == 'H' || *s == '?') {
Darren Tuckere7066df2004-05-24 10:18:05 +1000914 logit("Commands:");
915 logit(" -Lport:host:hostport Request local forward");
916 logit(" -Rport:host:hostport Request remote forward");
917 logit(" -KRhostport Cancel remote forward");
Damien Millerd27b9472005-12-13 19:29:02 +1100918 if (!options.permit_local_command)
919 goto out;
920 logit(" !args Execute local command");
921 goto out;
922 }
923
924 if (*s == '!' && options.permit_local_command) {
925 s++;
926 ssh_local_cmd(s);
Darren Tuckere7066df2004-05-24 10:18:05 +1000927 goto out;
928 }
929
930 if (*s == 'K') {
931 delete = 1;
932 s++;
933 }
934 if (*s != 'L' && *s != 'R') {
Damien Miller996acd22003-04-09 20:59:48 +1000935 logit("Invalid command.");
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000936 goto out;
937 }
Darren Tuckere7066df2004-05-24 10:18:05 +1000938 if (*s == 'L')
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000939 local = 1;
Darren Tuckere7066df2004-05-24 10:18:05 +1000940 if (local && delete) {
941 logit("Not supported.");
942 goto out;
943 }
944 if ((!local || delete) && !compat20) {
Damien Miller996acd22003-04-09 20:59:48 +1000945 logit("Not supported for SSH protocol version 1.");
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000946 goto out;
947 }
Darren Tuckere7066df2004-05-24 10:18:05 +1000948
949 s++;
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000950 while (*s && isspace(*s))
951 s++;
952
Darren Tuckere7066df2004-05-24 10:18:05 +1000953 if (delete) {
Damien Millerf91ee4c2005-03-01 21:24:33 +1100954 cancel_port = 0;
955 cancel_host = hpdelim(&s); /* may be NULL */
956 if (s != NULL) {
957 cancel_port = a2port(s);
958 cancel_host = cleanhostname(cancel_host);
959 } else {
960 cancel_port = a2port(cancel_host);
961 cancel_host = NULL;
962 }
963 if (cancel_port == 0) {
964 logit("Bad forwarding close port");
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000965 goto out;
966 }
Damien Millerf91ee4c2005-03-01 21:24:33 +1100967 channel_request_rforward_cancel(cancel_host, cancel_port);
Darren Tuckere7066df2004-05-24 10:18:05 +1000968 } else {
Damien Millerf91ee4c2005-03-01 21:24:33 +1100969 if (!parse_forward(&fwd, s)) {
Darren Tuckere7066df2004-05-24 10:18:05 +1000970 logit("Bad forwarding specification.");
971 goto out;
972 }
Darren Tuckere7066df2004-05-24 10:18:05 +1000973 if (local) {
Damien Millerf91ee4c2005-03-01 21:24:33 +1100974 if (channel_setup_local_fwd_listener(fwd.listen_host,
975 fwd.listen_port, fwd.connect_host,
976 fwd.connect_port, options.gateway_ports) < 0) {
Darren Tuckere7066df2004-05-24 10:18:05 +1000977 logit("Port forwarding failed.");
978 goto out;
979 }
Damien Millerf91ee4c2005-03-01 21:24:33 +1100980 } else {
981 channel_request_remote_forwarding(fwd.listen_host,
982 fwd.listen_port, fwd.connect_host,
983 fwd.connect_port);
984 }
985
Darren Tuckere7066df2004-05-24 10:18:05 +1000986 logit("Forwarding port.");
987 }
988
Ben Lindstrom5589f4b2002-03-22 03:24:32 +0000989out:
990 signal(SIGINT, handler);
991 enter_raw_mode();
992 if (cmd)
993 xfree(cmd);
994}
995
Damien Millerad833b32000-08-23 10:46:23 +1000996/* process the characters one by one */
Ben Lindstrombba81212001-06-25 05:01:22 +0000997static int
Damien Millerad833b32000-08-23 10:46:23 +1000998process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
999{
1000 char string[1024];
1001 pid_t pid;
1002 int bytes = 0;
Ben Lindstrom46c16222000-12-22 01:43:59 +00001003 u_int i;
1004 u_char ch;
Damien Millerad833b32000-08-23 10:46:23 +10001005 char *s;
1006
Damien Millereccb9de2005-06-17 12:59:34 +10001007 if (len <= 0)
1008 return (0);
1009
1010 for (i = 0; i < (u_int)len; i++) {
Damien Millerad833b32000-08-23 10:46:23 +10001011 /* Get one character at a time. */
1012 ch = buf[i];
1013
1014 if (escape_pending) {
1015 /* We have previously seen an escape character. */
1016 /* Clear the flag now. */
1017 escape_pending = 0;
1018
1019 /* Process the escaped character. */
1020 switch (ch) {
1021 case '.':
1022 /* Terminate the connection. */
1023 snprintf(string, sizeof string, "%c.\r\n", escape_char);
1024 buffer_append(berr, string, strlen(string));
Damien Millerad833b32000-08-23 10:46:23 +10001025
1026 quit_pending = 1;
1027 return -1;
1028
1029 case 'Z' - 64:
1030 /* Suspend the program. */
1031 /* Print a message to that effect to the user. */
1032 snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char);
1033 buffer_append(berr, string, strlen(string));
Damien Millerad833b32000-08-23 10:46:23 +10001034
1035 /* Restore terminal modes and suspend. */
1036 client_suspend_self(bin, bout, berr);
1037
1038 /* We have been continued. */
1039 continue;
1040
Damien Miller54c45982003-05-15 10:20:13 +10001041 case 'B':
1042 if (compat20) {
1043 snprintf(string, sizeof string,
1044 "%cB\r\n", escape_char);
1045 buffer_append(berr, string,
1046 strlen(string));
1047 channel_request_start(session_ident,
1048 "break", 0);
1049 packet_put_int(1000);
1050 packet_send();
1051 }
1052 continue;
1053
Ben Lindstromf28f6342001-04-04 02:03:04 +00001054 case 'R':
Ben Lindstrom11bd8992001-04-05 23:34:29 +00001055 if (compat20) {
1056 if (datafellows & SSH_BUG_NOREKEY)
Damien Miller996acd22003-04-09 20:59:48 +10001057 logit("Server does not support re-keying");
Ben Lindstrom11bd8992001-04-05 23:34:29 +00001058 else
1059 need_rekeying = 1;
1060 }
Ben Lindstromf28f6342001-04-04 02:03:04 +00001061 continue;
1062
Damien Millerad833b32000-08-23 10:46:23 +10001063 case '&':
Damien Millerad833b32000-08-23 10:46:23 +10001064 /*
1065 * Detach the program (continue to serve connections,
1066 * but put in background and no more new connections).
1067 */
Damien Miller96507ef2001-11-12 10:52:25 +11001068 /* Restore tty modes. */
1069 leave_raw_mode();
1070
1071 /* Stop listening for new connections. */
1072 channel_stop_listening();
1073
1074 snprintf(string, sizeof string,
1075 "%c& [backgrounded]\n", escape_char);
1076 buffer_append(berr, string, strlen(string));
1077
1078 /* Fork into background. */
1079 pid = fork();
1080 if (pid < 0) {
1081 error("fork: %.100s", strerror(errno));
1082 continue;
1083 }
1084 if (pid != 0) { /* This is the parent. */
1085 /* The parent just exits. */
1086 exit(0);
1087 }
1088 /* The child continues serving connections. */
1089 if (compat20) {
1090 buffer_append(bin, "\004", 1);
1091 /* fake EOF on stdin */
1092 return -1;
1093 } else if (!stdin_eof) {
Damien Millerad833b32000-08-23 10:46:23 +10001094 /*
1095 * Sending SSH_CMSG_EOF alone does not always appear
1096 * to be enough. So we try to send an EOF character
1097 * first.
1098 */
1099 packet_start(SSH_CMSG_STDIN_DATA);
1100 packet_put_string("\004", 1);
1101 packet_send();
1102 /* Close stdin. */
1103 stdin_eof = 1;
1104 if (buffer_len(bin) == 0) {
1105 packet_start(SSH_CMSG_EOF);
1106 packet_send();
1107 }
1108 }
Damien Miller96507ef2001-11-12 10:52:25 +11001109 continue;
Damien Millerad833b32000-08-23 10:46:23 +10001110
1111 case '?':
1112 snprintf(string, sizeof string,
1113"%c?\r\n\
1114Supported escape sequences:\r\n\
Damien Miller06692862002-09-04 16:32:10 +10001115%c. - terminate connection\r\n\
Damien Miller54c45982003-05-15 10:20:13 +10001116%cB - send a BREAK to the remote system\r\n\
Damien Miller06692862002-09-04 16:32:10 +10001117%cC - open a command line\r\n\
1118%cR - Request rekey (SSH protocol 2 only)\r\n\
1119%c^Z - suspend ssh\r\n\
1120%c# - list forwarded connections\r\n\
1121%c& - background ssh (when waiting for connections to terminate)\r\n\
1122%c? - this message\r\n\
1123%c%c - send the escape character by typing it twice\r\n\
Damien Millerad833b32000-08-23 10:46:23 +10001124(Note that escapes are only recognized immediately after newline.)\r\n",
Damien Miller06692862002-09-04 16:32:10 +10001125 escape_char, escape_char, escape_char, escape_char,
1126 escape_char, escape_char, escape_char, escape_char,
Damien Miller54c45982003-05-15 10:20:13 +10001127 escape_char, escape_char, escape_char);
Damien Millerad833b32000-08-23 10:46:23 +10001128 buffer_append(berr, string, strlen(string));
1129 continue;
1130
1131 case '#':
1132 snprintf(string, sizeof string, "%c#\r\n", escape_char);
1133 buffer_append(berr, string, strlen(string));
1134 s = channel_open_message();
1135 buffer_append(berr, s, strlen(s));
1136 xfree(s);
1137 continue;
1138
Ben Lindstrom5589f4b2002-03-22 03:24:32 +00001139 case 'C':
Ben Lindstrom681d9322002-03-22 03:53:00 +00001140 process_cmdline();
Ben Lindstrom5589f4b2002-03-22 03:24:32 +00001141 continue;
1142
Damien Millerad833b32000-08-23 10:46:23 +10001143 default:
1144 if (ch != escape_char) {
1145 buffer_put_char(bin, escape_char);
1146 bytes++;
1147 }
1148 /* Escaped characters fall through here */
1149 break;
1150 }
1151 } else {
1152 /*
1153 * The previous character was not an escape char. Check if this
1154 * is an escape.
1155 */
1156 if (last_was_cr && ch == escape_char) {
1157 /* It is. Set the flag and continue to next character. */
1158 escape_pending = 1;
1159 continue;
1160 }
1161 }
1162
1163 /*
1164 * Normal character. Record whether it was a newline,
1165 * and append it to the buffer.
1166 */
1167 last_was_cr = (ch == '\r' || ch == '\n');
1168 buffer_put_char(bin, ch);
1169 bytes++;
1170 }
1171 return bytes;
1172}
1173
Ben Lindstrombba81212001-06-25 05:01:22 +00001174static void
Damien Miller1383bd82000-04-06 12:32:37 +10001175client_process_input(fd_set * readset)
1176{
Damien Miller166fca82000-04-20 07:42:21 +10001177 int len;
Damien Millerad833b32000-08-23 10:46:23 +10001178 char buf[8192];
Damien Miller1383bd82000-04-06 12:32:37 +10001179
Damien Miller95def091999-11-25 00:26:21 +11001180 /* Read input from stdin. */
1181 if (FD_ISSET(fileno(stdin), readset)) {
1182 /* Read as much as possible. */
1183 len = read(fileno(stdin), buf, sizeof(buf));
Ben Lindstrom4c8cff12001-04-17 18:09:42 +00001184 if (len < 0 && (errno == EAGAIN || errno == EINTR))
1185 return; /* we'll try again later */
Damien Miller95def091999-11-25 00:26:21 +11001186 if (len <= 0) {
Damien Miller5428f641999-11-25 11:54:57 +11001187 /*
1188 * Received EOF or error. They are treated
1189 * similarly, except that an error message is printed
1190 * if it was an error condition.
1191 */
Damien Miller95def091999-11-25 00:26:21 +11001192 if (len < 0) {
1193 snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno));
1194 buffer_append(&stderr_buffer, buf, strlen(buf));
Damien Miller95def091999-11-25 00:26:21 +11001195 }
1196 /* Mark that we have seen EOF. */
1197 stdin_eof = 1;
Damien Miller5428f641999-11-25 11:54:57 +11001198 /*
1199 * Send an EOF message to the server unless there is
1200 * data in the buffer. If there is data in the
1201 * buffer, no message will be sent now. Code
1202 * elsewhere will send the EOF when the buffer
1203 * becomes empty if stdin_eof is set.
1204 */
Damien Miller95def091999-11-25 00:26:21 +11001205 if (buffer_len(&stdin_buffer) == 0) {
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001206 packet_start(SSH_CMSG_EOF);
1207 packet_send();
Damien Miller95def091999-11-25 00:26:21 +11001208 }
Ben Lindstrom2b1f71b2001-06-05 20:32:21 +00001209 } else if (escape_char == SSH_ESCAPECHAR_NONE) {
Damien Miller5428f641999-11-25 11:54:57 +11001210 /*
1211 * Normal successful read, and no escape character.
1212 * Just append the data to buffer.
1213 */
Damien Miller95def091999-11-25 00:26:21 +11001214 buffer_append(&stdin_buffer, buf, len);
Damien Miller95def091999-11-25 00:26:21 +11001215 } else {
Damien Miller5428f641999-11-25 11:54:57 +11001216 /*
1217 * Normal, successful read. But we have an escape character
1218 * and have to process the characters one by one.
1219 */
Ben Lindstrome9613cf2001-03-05 06:14:02 +00001220 if (process_escapes(&stdin_buffer, &stdout_buffer,
1221 &stderr_buffer, buf, len) == -1)
Damien Millerad833b32000-08-23 10:46:23 +10001222 return;
Damien Miller95def091999-11-25 00:26:21 +11001223 }
1224 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001225}
1226
Ben Lindstrombba81212001-06-25 05:01:22 +00001227static void
Damien Miller95def091999-11-25 00:26:21 +11001228client_process_output(fd_set * writeset)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001229{
Damien Miller95def091999-11-25 00:26:21 +11001230 int len;
1231 char buf[100];
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001232
Damien Miller95def091999-11-25 00:26:21 +11001233 /* Write buffered output to stdout. */
1234 if (FD_ISSET(fileno(stdout), writeset)) {
1235 /* Write as much data as possible. */
1236 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
Damien Miller037a0dc1999-12-07 15:38:31 +11001237 buffer_len(&stdout_buffer));
Damien Miller95def091999-11-25 00:26:21 +11001238 if (len <= 0) {
Ben Lindstrom4c8cff12001-04-17 18:09:42 +00001239 if (errno == EINTR || errno == EAGAIN)
Damien Miller95def091999-11-25 00:26:21 +11001240 len = 0;
1241 else {
Damien Miller5428f641999-11-25 11:54:57 +11001242 /*
1243 * An error or EOF was encountered. Put an
1244 * error message to stderr buffer.
1245 */
Damien Miller95def091999-11-25 00:26:21 +11001246 snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno));
1247 buffer_append(&stderr_buffer, buf, strlen(buf));
Damien Miller95def091999-11-25 00:26:21 +11001248 quit_pending = 1;
1249 return;
1250 }
1251 }
1252 /* Consume printed data from the buffer. */
1253 buffer_consume(&stdout_buffer, len);
Ben Lindstroma3700052001-04-05 23:26:32 +00001254 stdout_bytes += len;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001255 }
Damien Miller95def091999-11-25 00:26:21 +11001256 /* Write buffered output to stderr. */
1257 if (FD_ISSET(fileno(stderr), writeset)) {
1258 /* Write as much data as possible. */
1259 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
Damien Miller037a0dc1999-12-07 15:38:31 +11001260 buffer_len(&stderr_buffer));
Damien Miller95def091999-11-25 00:26:21 +11001261 if (len <= 0) {
Ben Lindstrom4c8cff12001-04-17 18:09:42 +00001262 if (errno == EINTR || errno == EAGAIN)
Damien Miller95def091999-11-25 00:26:21 +11001263 len = 0;
1264 else {
Damien Miller5428f641999-11-25 11:54:57 +11001265 /* EOF or error, but can't even print error message. */
Damien Miller95def091999-11-25 00:26:21 +11001266 quit_pending = 1;
1267 return;
1268 }
1269 }
1270 /* Consume printed characters from the buffer. */
1271 buffer_consume(&stderr_buffer, len);
Ben Lindstroma3700052001-04-05 23:26:32 +00001272 stderr_bytes += len;
Damien Miller95def091999-11-25 00:26:21 +11001273 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001274}
1275
Damien Miller5428f641999-11-25 11:54:57 +11001276/*
Damien Millerb38eff82000-04-01 11:09:21 +10001277 * Get packets from the connection input buffer, and process them as long as
1278 * there are packets available.
1279 *
1280 * Any unknown packets received during the actual
1281 * session cause the session to terminate. This is
1282 * intended to make debugging easier since no
1283 * confirmations are sent. Any compatible protocol
1284 * extensions must be negotiated during the
1285 * preparatory phase.
1286 */
1287
Ben Lindstrombba81212001-06-25 05:01:22 +00001288static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00001289client_process_buffered_input_packets(void)
Damien Millerb38eff82000-04-01 11:09:21 +10001290{
Ben Lindstromf28f6342001-04-04 02:03:04 +00001291 dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL);
Damien Millerb38eff82000-04-01 11:09:21 +10001292}
1293
Damien Millerad833b32000-08-23 10:46:23 +10001294/* scan buf[] for '~' before sending data to the peer */
1295
Ben Lindstrombba81212001-06-25 05:01:22 +00001296static int
Damien Millerad833b32000-08-23 10:46:23 +10001297simple_escape_filter(Channel *c, char *buf, int len)
1298{
1299 /* XXX we assume c->extended is writeable */
1300 return process_escapes(&c->input, &c->output, &c->extended, buf, len);
1301}
1302
Ben Lindstrombba81212001-06-25 05:01:22 +00001303static void
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001304client_channel_closed(int id, void *arg)
1305{
Damien Miller3ec27592001-10-12 11:35:04 +10001306 channel_cancel_cleanup(id);
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001307 session_closed = 1;
Darren Tucker9a2c4cd2003-09-22 21:16:05 +10001308 leave_raw_mode();
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001309}
1310
Damien Millerb38eff82000-04-01 11:09:21 +10001311/*
Damien Miller5428f641999-11-25 11:54:57 +11001312 * Implements the interactive session with the server. This is called after
1313 * the user has been authenticated, and a command has been started on the
Ben Lindstrom2b1f71b2001-06-05 20:32:21 +00001314 * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1315 * used as an escape character for terminating or suspending the session.
Damien Miller5428f641999-11-25 11:54:57 +11001316 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001317
Damien Miller4af51302000-04-16 11:18:38 +10001318int
Damien Millerad833b32000-08-23 10:46:23 +10001319client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001320{
Damien Miller5e953212001-01-30 09:14:00 +11001321 fd_set *readset = NULL, *writeset = NULL;
Damien Miller95def091999-11-25 00:26:21 +11001322 double start_time, total_time;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10001323 int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1324 u_int nalloc = 0;
Damien Miller95def091999-11-25 00:26:21 +11001325 char buf[100];
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001326
Damien Miller95def091999-11-25 00:26:21 +11001327 debug("Entering interactive session.");
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001328
Damien Miller95def091999-11-25 00:26:21 +11001329 start_time = get_current_time();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001330
Damien Miller95def091999-11-25 00:26:21 +11001331 /* Initialize variables. */
1332 escape_pending = 0;
1333 last_was_cr = 1;
1334 exit_status = -1;
1335 stdin_eof = 0;
1336 buffer_high = 64 * 1024;
1337 connection_in = packet_get_connection_in();
1338 connection_out = packet_get_connection_out();
Damien Miller5e953212001-01-30 09:14:00 +11001339 max_fd = MAX(connection_in, connection_out);
Damien Miller0e220db2004-06-15 10:34:08 +10001340 if (control_fd != -1)
1341 max_fd = MAX(max_fd, control_fd);
Damien Miller5e953212001-01-30 09:14:00 +11001342
1343 if (!compat20) {
Ben Lindstrom302ea6f2001-04-16 02:01:25 +00001344 /* enable nonblocking unless tty */
1345 if (!isatty(fileno(stdin)))
1346 set_nonblock(fileno(stdin));
1347 if (!isatty(fileno(stdout)))
1348 set_nonblock(fileno(stdout));
1349 if (!isatty(fileno(stderr)))
1350 set_nonblock(fileno(stderr));
Damien Miller5e953212001-01-30 09:14:00 +11001351 max_fd = MAX(max_fd, fileno(stdin));
1352 max_fd = MAX(max_fd, fileno(stdout));
1353 max_fd = MAX(max_fd, fileno(stderr));
1354 }
Damien Miller95def091999-11-25 00:26:21 +11001355 stdin_bytes = 0;
1356 stdout_bytes = 0;
1357 stderr_bytes = 0;
1358 quit_pending = 0;
1359 escape_char = escape_char_arg;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001360
Damien Miller95def091999-11-25 00:26:21 +11001361 /* Initialize buffers. */
1362 buffer_init(&stdin_buffer);
1363 buffer_init(&stdout_buffer);
1364 buffer_init(&stderr_buffer);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001365
Damien Millerb38eff82000-04-01 11:09:21 +10001366 client_init_dispatch();
1367
Ben Lindstromf49dbff2002-12-23 02:01:55 +00001368 /*
1369 * Set signal handlers, (e.g. to restore non-blocking mode)
1370 * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1371 */
Darren Tucker07336da2004-11-05 20:02:16 +11001372 if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1373 signal(SIGHUP, signal_handler);
Ben Lindstromf49dbff2002-12-23 02:01:55 +00001374 if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1375 signal(SIGINT, signal_handler);
1376 if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1377 signal(SIGQUIT, signal_handler);
1378 if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1379 signal(SIGTERM, signal_handler);
Darren Tucker5d78de62004-11-05 20:35:44 +11001380 signal(SIGWINCH, window_change_handler);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001381
Damien Miller95def091999-11-25 00:26:21 +11001382 if (have_pty)
1383 enter_raw_mode();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001384
Ben Lindstrom5b828322001-02-09 01:34:36 +00001385 if (compat20) {
1386 session_ident = ssh2_chan_id;
Ben Lindstrom2b1f71b2001-06-05 20:32:21 +00001387 if (escape_char != SSH_ESCAPECHAR_NONE)
Ben Lindstrom5b828322001-02-09 01:34:36 +00001388 channel_register_filter(session_ident,
1389 simple_escape_filter);
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001390 if (session_ident != -1)
1391 channel_register_cleanup(session_ident,
Damien Miller39eda6e2005-11-05 14:52:50 +11001392 client_channel_closed, 0);
Ben Lindstrom5b828322001-02-09 01:34:36 +00001393 } else {
1394 /* Check if we should immediately send eof on stdin. */
Damien Miller1383bd82000-04-06 12:32:37 +10001395 client_check_initial_eof_on_stdin();
Ben Lindstrom5b828322001-02-09 01:34:36 +00001396 }
Damien Millerad833b32000-08-23 10:46:23 +10001397
Damien Miller95def091999-11-25 00:26:21 +11001398 /* Main loop of the client for the interactive session mode. */
1399 while (!quit_pending) {
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001400
Damien Miller5428f641999-11-25 11:54:57 +11001401 /* Process buffered packets sent by the server. */
Damien Miller95def091999-11-25 00:26:21 +11001402 client_process_buffered_input_packets();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001403
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001404 if (compat20 && session_closed && !channel_still_open())
Damien Miller1383bd82000-04-06 12:32:37 +10001405 break;
Ben Lindstrom4c3f77d2001-04-05 23:37:36 +00001406
1407 rekeying = (xxx_kex != NULL && !xxx_kex->done);
Damien Miller1383bd82000-04-06 12:32:37 +10001408
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001409 if (rekeying) {
1410 debug("rekeying in progress");
1411 } else {
1412 /*
1413 * Make packets of buffered stdin data, and buffer
1414 * them for sending to the server.
1415 */
1416 if (!compat20)
1417 client_make_packets_from_stdin_data();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001418
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001419 /*
1420 * Make packets from buffered channel data, and
1421 * enqueue them for sending to the server.
1422 */
1423 if (packet_not_very_much_data_to_write())
1424 channel_output_poll();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001425
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001426 /*
1427 * Check if the window size has changed, and buffer a
1428 * message about it to the server if so.
1429 */
1430 client_check_window_change();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001431
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001432 if (quit_pending)
1433 break;
1434 }
Damien Miller5428f641999-11-25 11:54:57 +11001435 /*
1436 * Wait until we have something to do (something becomes
1437 * available on one of the descriptors).
1438 */
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001439 max_fd2 = max_fd;
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001440 client_wait_until_can_do_something(&readset, &writeset,
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001441 &max_fd2, &nalloc, rekeying);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001442
Damien Miller95def091999-11-25 00:26:21 +11001443 if (quit_pending)
1444 break;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001445
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001446 /* Do channel operations unless rekeying in progress. */
1447 if (!rekeying) {
1448 channel_after_select(readset, writeset);
Damien Millera5539d22003-04-09 20:50:06 +10001449 if (need_rekeying || packet_need_rekeying()) {
1450 debug("need rekeying");
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001451 xxx_kex->done = 0;
1452 kex_send_kexinit(xxx_kex);
1453 need_rekeying = 0;
1454 }
1455 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001456
Damien Miller1383bd82000-04-06 12:32:37 +10001457 /* Buffer input from the connection. */
Damien Miller5e953212001-01-30 09:14:00 +11001458 client_process_net_input(readset);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001459
Damien Miller0e220db2004-06-15 10:34:08 +10001460 /* Accept control connections. */
1461 client_process_control(readset);
1462
Damien Miller1383bd82000-04-06 12:32:37 +10001463 if (quit_pending)
1464 break;
1465
1466 if (!compat20) {
1467 /* Buffer data from stdin */
Damien Miller5e953212001-01-30 09:14:00 +11001468 client_process_input(readset);
Damien Miller1383bd82000-04-06 12:32:37 +10001469 /*
1470 * Process output to stdout and stderr. Output to
1471 * the connection is processed elsewhere (above).
1472 */
Damien Miller5e953212001-01-30 09:14:00 +11001473 client_process_output(writeset);
Damien Miller1383bd82000-04-06 12:32:37 +10001474 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001475
Damien Miller5428f641999-11-25 11:54:57 +11001476 /* Send as much buffered packet data as possible to the sender. */
Damien Miller5e953212001-01-30 09:14:00 +11001477 if (FD_ISSET(connection_out, writeset))
Damien Miller95def091999-11-25 00:26:21 +11001478 packet_write_poll();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001479 }
Damien Miller5e953212001-01-30 09:14:00 +11001480 if (readset)
1481 xfree(readset);
1482 if (writeset)
1483 xfree(writeset);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001484
Damien Miller95def091999-11-25 00:26:21 +11001485 /* Terminate the session. */
1486
1487 /* Stop watching for window change. */
Darren Tucker5d78de62004-11-05 20:35:44 +11001488 signal(SIGWINCH, SIG_DFL);
Damien Miller95def091999-11-25 00:26:21 +11001489
Ben Lindstrom601e4362001-06-21 03:19:23 +00001490 channel_free_all();
Damien Miller95def091999-11-25 00:26:21 +11001491
Ben Lindstromec46e0b2001-06-09 01:27:31 +00001492 if (have_pty)
1493 leave_raw_mode();
Ben Lindstromc93e84c2001-05-12 00:08:37 +00001494
1495 /* restore blocking io */
1496 if (!isatty(fileno(stdin)))
1497 unset_nonblock(fileno(stdin));
1498 if (!isatty(fileno(stdout)))
1499 unset_nonblock(fileno(stdout));
1500 if (!isatty(fileno(stderr)))
1501 unset_nonblock(fileno(stderr));
1502
Damien Millerd6965512003-12-17 16:31:53 +11001503 /*
1504 * If there was no shell or command requested, there will be no remote
1505 * exit status to be returned. In that case, clear error code if the
1506 * connection was deliberately terminated at this end.
1507 */
1508 if (no_shell_flag && received_signal == SIGTERM) {
1509 received_signal = 0;
1510 exit_status = 0;
1511 }
1512
Darren Tucker9a2c4cd2003-09-22 21:16:05 +10001513 if (received_signal)
Ben Lindstromf8f065b2001-12-06 17:52:16 +00001514 fatal("Killed by signal %d.", (int) received_signal);
Ben Lindstromec46e0b2001-06-09 01:27:31 +00001515
1516 /*
1517 * In interactive mode (with pseudo tty) display a message indicating
1518 * that the connection has been closed.
1519 */
1520 if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1521 snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host);
1522 buffer_append(&stderr_buffer, buf, strlen(buf));
1523 }
1524
Damien Miller95def091999-11-25 00:26:21 +11001525 /* Output any buffered data for stdout. */
Ben Lindstromc93e84c2001-05-12 00:08:37 +00001526 while (buffer_len(&stdout_buffer) > 0) {
1527 len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
Damien Miller037a0dc1999-12-07 15:38:31 +11001528 buffer_len(&stdout_buffer));
Ben Lindstromc93e84c2001-05-12 00:08:37 +00001529 if (len <= 0) {
Damien Miller95def091999-11-25 00:26:21 +11001530 error("Write failed flushing stdout buffer.");
Ben Lindstromc93e84c2001-05-12 00:08:37 +00001531 break;
1532 }
Damien Miller95def091999-11-25 00:26:21 +11001533 buffer_consume(&stdout_buffer, len);
Ben Lindstroma3700052001-04-05 23:26:32 +00001534 stdout_bytes += len;
Damien Miller95def091999-11-25 00:26:21 +11001535 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001536
Damien Miller95def091999-11-25 00:26:21 +11001537 /* Output any buffered data for stderr. */
Ben Lindstromc93e84c2001-05-12 00:08:37 +00001538 while (buffer_len(&stderr_buffer) > 0) {
1539 len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
Damien Miller037a0dc1999-12-07 15:38:31 +11001540 buffer_len(&stderr_buffer));
Ben Lindstromc93e84c2001-05-12 00:08:37 +00001541 if (len <= 0) {
Damien Miller95def091999-11-25 00:26:21 +11001542 error("Write failed flushing stderr buffer.");
Ben Lindstromc93e84c2001-05-12 00:08:37 +00001543 break;
1544 }
Damien Miller95def091999-11-25 00:26:21 +11001545 buffer_consume(&stderr_buffer, len);
Ben Lindstroma3700052001-04-05 23:26:32 +00001546 stderr_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 /* Clear and free any buffers. */
1550 memset(buf, 0, sizeof(buf));
1551 buffer_free(&stdin_buffer);
1552 buffer_free(&stdout_buffer);
1553 buffer_free(&stderr_buffer);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001554
Damien Miller95def091999-11-25 00:26:21 +11001555 /* Report bytes transferred, and transfer rates. */
1556 total_time = get_current_time() - start_time;
1557 debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds",
Damien Miller9f0f5c62001-12-21 14:45:46 +11001558 stdin_bytes, stdout_bytes, stderr_bytes, total_time);
Damien Miller95def091999-11-25 00:26:21 +11001559 if (total_time > 0)
1560 debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
Damien Miller9f0f5c62001-12-21 14:45:46 +11001561 stdin_bytes / total_time, stdout_bytes / total_time,
1562 stderr_bytes / total_time);
Damien Miller95def091999-11-25 00:26:21 +11001563
1564 /* Return the exit status of the program. */
1565 debug("Exit status %d", exit_status);
1566 return exit_status;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001567}
Damien Millerb38eff82000-04-01 11:09:21 +10001568
1569/*********/
1570
Ben Lindstrombba81212001-06-25 05:01:22 +00001571static void
Damien Miller630d6f42002-01-22 23:17:30 +11001572client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10001573{
Ben Lindstrom46c16222000-12-22 01:43:59 +00001574 u_int data_len;
Damien Millerb38eff82000-04-01 11:09:21 +10001575 char *data = packet_get_string(&data_len);
Damien Miller48b03fc2002-01-22 23:11:40 +11001576 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10001577 buffer_append(&stdout_buffer, data, data_len);
Damien Millerb38eff82000-04-01 11:09:21 +10001578 memset(data, 0, data_len);
1579 xfree(data);
1580}
Ben Lindstrombba81212001-06-25 05:01:22 +00001581static void
Damien Miller630d6f42002-01-22 23:17:30 +11001582client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10001583{
Ben Lindstrom46c16222000-12-22 01:43:59 +00001584 u_int data_len;
Damien Millerb38eff82000-04-01 11:09:21 +10001585 char *data = packet_get_string(&data_len);
Damien Miller48b03fc2002-01-22 23:11:40 +11001586 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10001587 buffer_append(&stderr_buffer, data, data_len);
Damien Millerb38eff82000-04-01 11:09:21 +10001588 memset(data, 0, data_len);
1589 xfree(data);
1590}
Ben Lindstrombba81212001-06-25 05:01:22 +00001591static void
Damien Miller630d6f42002-01-22 23:17:30 +11001592client_input_exit_status(int type, u_int32_t seq, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10001593{
Damien Millerb38eff82000-04-01 11:09:21 +10001594 exit_status = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11001595 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10001596 /* Acknowledge the exit. */
1597 packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1598 packet_send();
1599 /*
1600 * Must wait for packet to be sent since we are
1601 * exiting the loop.
1602 */
1603 packet_write_wait();
1604 /* Flag that we want to exit. */
1605 quit_pending = 1;
1606}
Darren Tucker5dcdd212003-10-02 16:17:00 +10001607static void
1608client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1609{
1610 Channel *c = NULL;
1611 int remote_id, sock;
1612
1613 /* Read the remote channel number from the message. */
1614 remote_id = packet_get_int();
1615 packet_check_eom();
1616
1617 /*
1618 * Get a connection to the local authentication agent (this may again
1619 * get forwarded).
1620 */
1621 sock = ssh_get_authentication_socket();
1622
1623 /*
1624 * If we could not connect the agent, send an error message back to
1625 * the server. This should never happen unless the agent dies,
1626 * because authentication forwarding is only enabled if we have an
1627 * agent.
1628 */
1629 if (sock >= 0) {
1630 c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1631 -1, 0, 0, 0, "authentication agent connection", 1);
1632 c->remote_id = remote_id;
1633 c->force_drain = 1;
1634 }
1635 if (c == NULL) {
1636 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1637 packet_put_int(remote_id);
1638 } else {
1639 /* Send a confirmation to the remote host. */
1640 debug("Forwarding authentication connection.");
1641 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1642 packet_put_int(remote_id);
1643 packet_put_int(c->self);
1644 }
1645 packet_send();
1646}
Damien Millerb38eff82000-04-01 11:09:21 +10001647
Ben Lindstrombba81212001-06-25 05:01:22 +00001648static Channel *
Damien Miller0bc1bd82000-11-13 22:57:25 +11001649client_request_forwarded_tcpip(const char *request_type, int rchan)
1650{
Ben Lindstroma962c2f2002-07-04 00:14:17 +00001651 Channel *c = NULL;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001652 char *listen_address, *originator_address;
1653 int listen_port, originator_port;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001654 int sock;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001655
1656 /* Get rest of the packet */
1657 listen_address = packet_get_string(NULL);
1658 listen_port = packet_get_int();
1659 originator_address = packet_get_string(NULL);
1660 originator_port = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11001661 packet_check_eom();
Damien Miller0bc1bd82000-11-13 22:57:25 +11001662
1663 debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d",
1664 listen_address, listen_port, originator_address, originator_port);
1665
Ben Lindstrom173e6462001-07-04 05:15:15 +00001666 sock = channel_connect_by_listen_address(listen_port);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001667 if (sock < 0) {
1668 xfree(originator_address);
1669 xfree(listen_address);
1670 return NULL;
1671 }
1672 c = channel_new("forwarded-tcpip",
1673 SSH_CHANNEL_CONNECTING, sock, sock, -1,
1674 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001675 originator_address, 1);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001676 xfree(originator_address);
1677 xfree(listen_address);
1678 return c;
1679}
1680
Ben Lindstroma962c2f2002-07-04 00:14:17 +00001681static Channel *
Damien Miller0bc1bd82000-11-13 22:57:25 +11001682client_request_x11(const char *request_type, int rchan)
1683{
1684 Channel *c = NULL;
1685 char *originator;
1686 int originator_port;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001687 int sock;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001688
1689 if (!options.forward_x11) {
1690 error("Warning: ssh server tried X11 forwarding.");
1691 error("Warning: this is probably a break in attempt by a malicious server.");
1692 return NULL;
1693 }
1694 originator = packet_get_string(NULL);
1695 if (datafellows & SSH_BUG_X11FWD) {
1696 debug2("buggy server: x11 request w/o originator_port");
1697 originator_port = 0;
1698 } else {
1699 originator_port = packet_get_int();
1700 }
Damien Miller48b03fc2002-01-22 23:11:40 +11001701 packet_check_eom();
Damien Miller0bc1bd82000-11-13 22:57:25 +11001702 /* XXX check permission */
Damien Millerd83ff352001-01-30 09:19:34 +11001703 debug("client_request_x11: request from %s %d", originator,
1704 originator_port);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001705 xfree(originator);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001706 sock = x11_connect_display();
1707 if (sock < 0)
1708 return NULL;
1709 c = channel_new("x11",
1710 SSH_CHANNEL_X11_OPEN, sock, sock, -1,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001711 CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
Ben Lindstrom944c4f02001-09-18 05:51:13 +00001712 c->force_drain = 1;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001713 return c;
1714}
1715
Ben Lindstroma962c2f2002-07-04 00:14:17 +00001716static Channel *
Damien Miller0bc1bd82000-11-13 22:57:25 +11001717client_request_agent(const char *request_type, int rchan)
1718{
1719 Channel *c = NULL;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001720 int sock;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001721
1722 if (!options.forward_agent) {
1723 error("Warning: ssh server tried agent forwarding.");
1724 error("Warning: this is probably a break in attempt by a malicious server.");
1725 return NULL;
1726 }
1727 sock = ssh_get_authentication_socket();
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001728 if (sock < 0)
1729 return NULL;
1730 c = channel_new("authentication agent connection",
1731 SSH_CHANNEL_OPEN, sock, sock, -1,
1732 CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001733 "authentication agent connection", 1);
Ben Lindstrom944c4f02001-09-18 05:51:13 +00001734 c->force_drain = 1;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001735 return c;
1736}
1737
Damien Millerbd483e72000-04-30 10:00:53 +10001738/* XXXX move to generic input handler */
Ben Lindstrombba81212001-06-25 05:01:22 +00001739static void
Damien Miller630d6f42002-01-22 23:17:30 +11001740client_input_channel_open(int type, u_int32_t seq, void *ctxt)
Damien Millerbd483e72000-04-30 10:00:53 +10001741{
1742 Channel *c = NULL;
1743 char *ctype;
Damien Millerbd483e72000-04-30 10:00:53 +10001744 int rchan;
Ben Lindstrom4fed2be2002-06-25 23:17:36 +00001745 u_int rmaxpack, rwindow, len;
Damien Millerbd483e72000-04-30 10:00:53 +10001746
1747 ctype = packet_get_string(&len);
1748 rchan = packet_get_int();
1749 rwindow = packet_get_int();
1750 rmaxpack = packet_get_int();
1751
Damien Millere247cc42000-05-07 12:03:14 +10001752 debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
Damien Millerbd483e72000-04-30 10:00:53 +10001753 ctype, rchan, rwindow, rmaxpack);
1754
Damien Miller0bc1bd82000-11-13 22:57:25 +11001755 if (strcmp(ctype, "forwarded-tcpip") == 0) {
1756 c = client_request_forwarded_tcpip(ctype, rchan);
1757 } else if (strcmp(ctype, "x11") == 0) {
1758 c = client_request_x11(ctype, rchan);
1759 } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1760 c = client_request_agent(ctype, rchan);
Damien Millerbd483e72000-04-30 10:00:53 +10001761 }
1762/* XXX duplicate : */
1763 if (c != NULL) {
1764 debug("confirm %s", ctype);
1765 c->remote_id = rchan;
1766 c->remote_window = rwindow;
1767 c->remote_maxpacket = rmaxpack;
Ben Lindstroma69d89b2001-05-09 00:01:18 +00001768 if (c->type != SSH_CHANNEL_CONNECTING) {
1769 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1770 packet_put_int(c->remote_id);
1771 packet_put_int(c->self);
1772 packet_put_int(c->local_window);
1773 packet_put_int(c->local_maxpacket);
1774 packet_send();
1775 }
Damien Millerbd483e72000-04-30 10:00:53 +10001776 } else {
1777 debug("failure %s", ctype);
1778 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1779 packet_put_int(rchan);
1780 packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
Ben Lindstromf3436742001-04-29 19:52:00 +00001781 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
Ben Lindstroma69d89b2001-05-09 00:01:18 +00001782 packet_put_cstring("open failed");
Ben Lindstromf3436742001-04-29 19:52:00 +00001783 packet_put_cstring("");
1784 }
Damien Millerbd483e72000-04-30 10:00:53 +10001785 packet_send();
1786 }
1787 xfree(ctype);
1788}
Ben Lindstrombba81212001-06-25 05:01:22 +00001789static void
Damien Miller630d6f42002-01-22 23:17:30 +11001790client_input_channel_req(int type, u_int32_t seq, void *ctxt)
Ben Lindstrom5b828322001-02-09 01:34:36 +00001791{
1792 Channel *c = NULL;
Damien Miller0e220db2004-06-15 10:34:08 +10001793 int exitval, id, reply, success = 0;
Ben Lindstrom5b828322001-02-09 01:34:36 +00001794 char *rtype;
1795
1796 id = packet_get_int();
1797 rtype = packet_get_string(NULL);
1798 reply = packet_get_char();
1799
1800 debug("client_input_channel_req: channel %d rtype %s reply %d",
1801 id, rtype, reply);
1802
Damien Miller3bbd8782004-06-18 22:23:22 +10001803 if (id == -1) {
1804 error("client_input_channel_req: request for channel -1");
1805 } else if ((c = channel_lookup(id)) == NULL) {
Ben Lindstrom5b828322001-02-09 01:34:36 +00001806 error("client_input_channel_req: channel %d: unknown channel", id);
1807 } else if (strcmp(rtype, "exit-status") == 0) {
Damien Miller0e220db2004-06-15 10:34:08 +10001808 exitval = packet_get_int();
1809 if (id == session_ident) {
1810 success = 1;
1811 exit_status = exitval;
1812 } else if (c->ctl_fd == -1) {
1813 error("client_input_channel_req: unexpected channel %d",
1814 session_ident);
1815 } else {
1816 atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1817 success = 1;
1818 }
Damien Miller48b03fc2002-01-22 23:11:40 +11001819 packet_check_eom();
Ben Lindstrom5b828322001-02-09 01:34:36 +00001820 }
1821 if (reply) {
1822 packet_start(success ?
1823 SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
Damien Miller3bbd8782004-06-18 22:23:22 +10001824 packet_put_int(id);
Ben Lindstrom5b828322001-02-09 01:34:36 +00001825 packet_send();
1826 }
1827 xfree(rtype);
1828}
Damien Millerc3fa4072002-01-22 23:21:58 +11001829static void
1830client_input_global_request(int type, u_int32_t seq, void *ctxt)
1831{
1832 char *rtype;
1833 int want_reply;
1834 int success = 0;
1835
1836 rtype = packet_get_string(NULL);
1837 want_reply = packet_get_char();
Damien Miller509b0102003-12-17 16:33:10 +11001838 debug("client_input_global_request: rtype %s want_reply %d",
1839 rtype, want_reply);
Damien Millerc3fa4072002-01-22 23:21:58 +11001840 if (want_reply) {
1841 packet_start(success ?
1842 SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1843 packet_send();
1844 packet_write_wait();
1845 }
1846 xfree(rtype);
1847}
Damien Millerbd483e72000-04-30 10:00:53 +10001848
Damien Miller0e220db2004-06-15 10:34:08 +10001849void
Darren Tuckerfc959702004-07-17 16:12:08 +10001850client_session2_setup(int id, int want_tty, int want_subsystem,
Damien Miller3756dce2004-06-18 01:17:29 +10001851 const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env,
Damien Miller0e220db2004-06-15 10:34:08 +10001852 dispatch_fn *subsys_repl)
1853{
1854 int len;
Darren Tucker5d78de62004-11-05 20:35:44 +11001855 Channel *c = NULL;
Damien Miller0e220db2004-06-15 10:34:08 +10001856
1857 debug2("%s: id %d", __func__, id);
1858
Darren Tucker5d78de62004-11-05 20:35:44 +11001859 if ((c = channel_lookup(id)) == NULL)
1860 fatal("client_session2_setup: channel %d: unknown channel", id);
1861
Damien Miller0e220db2004-06-15 10:34:08 +10001862 if (want_tty) {
1863 struct winsize ws;
1864 struct termios tio;
1865
1866 /* Store window size in the packet. */
1867 if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1868 memset(&ws, 0, sizeof(ws));
1869
1870 channel_request_start(id, "pty-req", 0);
1871 packet_put_cstring(term != NULL ? term : "");
1872 packet_put_int(ws.ws_col);
1873 packet_put_int(ws.ws_row);
1874 packet_put_int(ws.ws_xpixel);
1875 packet_put_int(ws.ws_ypixel);
1876 tio = get_saved_tio();
1877 tty_make_modes(-1, tiop != NULL ? tiop : &tio);
1878 packet_send();
1879 /* XXX wait for reply */
Darren Tucker5d78de62004-11-05 20:35:44 +11001880 c->client_tty = 1;
Damien Miller0e220db2004-06-15 10:34:08 +10001881 }
1882
1883 /* Transfer any environment variables from client to server */
Damien Miller3756dce2004-06-18 01:17:29 +10001884 if (options.num_send_env != 0 && env != NULL) {
Damien Miller0e220db2004-06-15 10:34:08 +10001885 int i, j, matched;
Damien Miller0e220db2004-06-15 10:34:08 +10001886 char *name, *val;
1887
1888 debug("Sending environment.");
Damien Miller3756dce2004-06-18 01:17:29 +10001889 for (i = 0; env[i] != NULL; i++) {
Damien Miller0e220db2004-06-15 10:34:08 +10001890 /* Split */
Damien Miller3756dce2004-06-18 01:17:29 +10001891 name = xstrdup(env[i]);
Damien Miller0e220db2004-06-15 10:34:08 +10001892 if ((val = strchr(name, '=')) == NULL) {
Damien Miller0a0176e2005-11-05 15:07:59 +11001893 xfree(name);
Damien Miller0e220db2004-06-15 10:34:08 +10001894 continue;
1895 }
1896 *val++ = '\0';
1897
1898 matched = 0;
1899 for (j = 0; j < options.num_send_env; j++) {
1900 if (match_pattern(name, options.send_env[j])) {
1901 matched = 1;
1902 break;
1903 }
1904 }
1905 if (!matched) {
1906 debug3("Ignored env %s", name);
Damien Miller0a0176e2005-11-05 15:07:59 +11001907 xfree(name);
Damien Miller0e220db2004-06-15 10:34:08 +10001908 continue;
1909 }
1910
1911 debug("Sending env %s = %s", name, val);
1912 channel_request_start(id, "env", 0);
1913 packet_put_cstring(name);
1914 packet_put_cstring(val);
1915 packet_send();
Damien Miller0a0176e2005-11-05 15:07:59 +11001916 xfree(name);
Damien Miller0e220db2004-06-15 10:34:08 +10001917 }
1918 }
1919
1920 len = buffer_len(cmd);
1921 if (len > 0) {
1922 if (len > 900)
1923 len = 900;
1924 if (want_subsystem) {
1925 debug("Sending subsystem: %.*s", len, (u_char*)buffer_ptr(cmd));
1926 channel_request_start(id, "subsystem", subsys_repl != NULL);
1927 if (subsys_repl != NULL) {
1928 /* register callback for reply */
1929 /* XXX we assume that client_loop has already been called */
1930 dispatch_set(SSH2_MSG_CHANNEL_FAILURE, subsys_repl);
1931 dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, subsys_repl);
1932 }
1933 } else {
1934 debug("Sending command: %.*s", len, (u_char*)buffer_ptr(cmd));
1935 channel_request_start(id, "exec", 0);
1936 }
1937 packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
1938 packet_send();
1939 } else {
1940 channel_request_start(id, "shell", 0);
1941 packet_send();
1942 }
1943}
1944
Ben Lindstrombba81212001-06-25 05:01:22 +00001945static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00001946client_init_dispatch_20(void)
Damien Miller1383bd82000-04-06 12:32:37 +10001947{
Ben Lindstrom8ac91062001-04-04 17:57:54 +00001948 dispatch_init(&dispatch_protocol_error);
Damien Miller2797f7f2002-04-23 21:09:44 +10001949
Damien Miller1383bd82000-04-06 12:32:37 +10001950 dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1951 dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1952 dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1953 dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
Damien Millerbd483e72000-04-30 10:00:53 +10001954 dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
Damien Miller1383bd82000-04-06 12:32:37 +10001955 dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1956 dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
Ben Lindstrom5b828322001-02-09 01:34:36 +00001957 dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
Damien Miller1383bd82000-04-06 12:32:37 +10001958 dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
Damien Millerc3fa4072002-01-22 23:21:58 +11001959 dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
Ben Lindstrom8ac91062001-04-04 17:57:54 +00001960
1961 /* rekeying */
1962 dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
Damien Miller2797f7f2002-04-23 21:09:44 +10001963
1964 /* global request reply messages */
1965 dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
1966 dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
Damien Miller1383bd82000-04-06 12:32:37 +10001967}
Ben Lindstrombba81212001-06-25 05:01:22 +00001968static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00001969client_init_dispatch_13(void)
Damien Millerb38eff82000-04-01 11:09:21 +10001970{
1971 dispatch_init(NULL);
1972 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
1973 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
1974 dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
Damien Millerb38eff82000-04-01 11:09:21 +10001975 dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1976 dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1977 dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
Damien Millerb38eff82000-04-01 11:09:21 +10001978 dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
1979 dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
1980 dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
Damien Miller69b69aa2000-10-28 14:19:58 +11001981
1982 dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
Darren Tucker5dcdd212003-10-02 16:17:00 +10001983 &client_input_agent_open : &deny_input_open);
Damien Miller69b69aa2000-10-28 14:19:58 +11001984 dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
1985 &x11_input_open : &deny_input_open);
Damien Millerb38eff82000-04-01 11:09:21 +10001986}
Ben Lindstrombba81212001-06-25 05:01:22 +00001987static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00001988client_init_dispatch_15(void)
Damien Millerb38eff82000-04-01 11:09:21 +10001989{
1990 client_init_dispatch_13();
1991 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
1992 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
1993}
Ben Lindstromdb47f382001-07-04 05:10:27 +00001994static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00001995client_init_dispatch(void)
Damien Millerb38eff82000-04-01 11:09:21 +10001996{
Damien Miller1383bd82000-04-06 12:32:37 +10001997 if (compat20)
1998 client_init_dispatch_20();
1999 else if (compat13)
Damien Millerb38eff82000-04-01 11:09:21 +10002000 client_init_dispatch_13();
2001 else
2002 client_init_dispatch_15();
2003}
Darren Tucker9a2c4cd2003-09-22 21:16:05 +10002004
2005/* client specific fatal cleanup */
2006void
Darren Tucker3e33cec2003-10-02 16:12:36 +10002007cleanup_exit(int i)
Darren Tucker9a2c4cd2003-09-22 21:16:05 +10002008{
Darren Tucker9a2c4cd2003-09-22 21:16:05 +10002009 leave_raw_mode();
2010 leave_non_blocking();
Damien Miller0e220db2004-06-15 10:34:08 +10002011 if (options.control_path != NULL && control_fd != -1)
2012 unlink(options.control_path);
Darren Tucker3e33cec2003-10-02 16:12:36 +10002013 _exit(i);
Darren Tucker9a2c4cd2003-09-22 21:16:05 +10002014}