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91d9cdd3 | 1 | /* $OpenBSD: clientloop.c,v 1.209 2009/02/12 03:00:56 djm Exp $ */ |
3c0ef626 | 2 | /* |
3 | * Author: Tatu Ylonen <ylo@cs.hut.fi> | |
4 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
5 | * All rights reserved | |
6 | * The main loop for the interactive session (client side). | |
7 | * | |
8 | * As far as I am concerned, the code I have written for this software | |
9 | * can be used freely for any purpose. Any derived versions of this | |
10 | * software must be clearly marked as such, and if the derived work is | |
11 | * incompatible with the protocol description in the RFC file, it must be | |
12 | * called by a name other than "ssh" or "Secure Shell". | |
13 | * | |
14 | * | |
15 | * Copyright (c) 1999 Theo de Raadt. All rights reserved. | |
16 | * | |
17 | * Redistribution and use in source and binary forms, with or without | |
18 | * modification, are permitted provided that the following conditions | |
19 | * are met: | |
20 | * 1. Redistributions of source code must retain the above copyright | |
21 | * notice, this list of conditions and the following disclaimer. | |
22 | * 2. Redistributions in binary form must reproduce the above copyright | |
23 | * notice, this list of conditions and the following disclaimer in the | |
24 | * documentation and/or other materials provided with the distribution. | |
25 | * | |
26 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
27 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
28 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
29 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
30 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
31 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
32 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
33 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
34 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
35 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
36 | * | |
37 | * | |
38 | * SSH2 support added by Markus Friedl. | |
39 | * Copyright (c) 1999, 2000, 2001 Markus Friedl. All rights reserved. | |
40 | * | |
41 | * Redistribution and use in source and binary forms, with or without | |
42 | * modification, are permitted provided that the following conditions | |
43 | * are met: | |
44 | * 1. Redistributions of source code must retain the above copyright | |
45 | * notice, this list of conditions and the following disclaimer. | |
46 | * 2. Redistributions in binary form must reproduce the above copyright | |
47 | * notice, this list of conditions and the following disclaimer in the | |
48 | * documentation and/or other materials provided with the distribution. | |
49 | * | |
50 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
51 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
52 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
53 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
54 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
55 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
56 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
57 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
58 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
59 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
60 | */ | |
61 | ||
62 | #include "includes.h" | |
3c0ef626 | 63 | |
9108f8d9 | 64 | #include <sys/types.h> |
65 | #include <sys/ioctl.h> | |
66 | #include <sys/param.h> | |
67 | #ifdef HAVE_SYS_STAT_H | |
68 | # include <sys/stat.h> | |
69 | #endif | |
70 | #ifdef HAVE_SYS_TIME_H | |
71 | # include <sys/time.h> | |
72 | #endif | |
73 | #include <sys/socket.h> | |
74 | ||
75 | #include <ctype.h> | |
76 | #include <errno.h> | |
77 | #ifdef HAVE_PATHS_H | |
78 | #include <paths.h> | |
79 | #endif | |
80 | #include <signal.h> | |
81 | #include <stdarg.h> | |
82 | #include <stdio.h> | |
83 | #include <stdlib.h> | |
84 | #include <string.h> | |
85 | #include <termios.h> | |
86 | #include <pwd.h> | |
87 | #include <unistd.h> | |
88 | ||
22616013 | 89 | #include "openbsd-compat/sys-queue.h" |
9108f8d9 | 90 | #include "xmalloc.h" |
3c0ef626 | 91 | #include "ssh.h" |
92 | #include "ssh1.h" | |
93 | #include "ssh2.h" | |
3c0ef626 | 94 | #include "packet.h" |
95 | #include "buffer.h" | |
96 | #include "compat.h" | |
97 | #include "channels.h" | |
98 | #include "dispatch.h" | |
3c0ef626 | 99 | #include "key.h" |
9108f8d9 | 100 | #include "cipher.h" |
3c0ef626 | 101 | #include "kex.h" |
102 | #include "log.h" | |
103 | #include "readconf.h" | |
104 | #include "clientloop.h" | |
2c06c99b | 105 | #include "sshconnect.h" |
3c0ef626 | 106 | #include "authfd.h" |
107 | #include "atomicio.h" | |
c9f39d2c | 108 | #include "sshpty.h" |
3c0ef626 | 109 | #include "misc.h" |
c9f39d2c | 110 | #include "match.h" |
111 | #include "msg.h" | |
3c0ef626 | 112 | |
113 | /* import options */ | |
114 | extern Options options; | |
115 | ||
116 | /* Flag indicating that stdin should be redirected from /dev/null. */ | |
117 | extern int stdin_null_flag; | |
118 | ||
cdd66111 | 119 | /* Flag indicating that no shell has been requested */ |
120 | extern int no_shell_flag; | |
121 | ||
c9f39d2c | 122 | /* Control socket */ |
22616013 | 123 | extern int muxserver_sock; |
c9f39d2c | 124 | |
3c0ef626 | 125 | /* |
126 | * Name of the host we are connecting to. This is the name given on the | |
127 | * command line, or the HostName specified for the user-supplied name in a | |
128 | * configuration file. | |
129 | */ | |
130 | extern char *host; | |
131 | ||
132 | /* | |
133 | * Flag to indicate that we have received a window change signal which has | |
134 | * not yet been processed. This will cause a message indicating the new | |
135 | * window size to be sent to the server a little later. This is volatile | |
136 | * because this is updated in a signal handler. | |
137 | */ | |
e9a17296 | 138 | static volatile sig_atomic_t received_window_change_signal = 0; |
139 | static volatile sig_atomic_t received_signal = 0; | |
3c0ef626 | 140 | |
2c06c99b | 141 | /* Flag indicating whether the user's terminal is in non-blocking mode. */ |
3c0ef626 | 142 | static int in_non_blocking_mode = 0; |
143 | ||
144 | /* Common data for the client loop code. */ | |
9108f8d9 | 145 | static volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */ |
22616013 | 146 | static int escape_char1; /* Escape character. (proto1 only) */ |
147 | static int escape_pending1; /* Last character was an escape (proto1 only) */ | |
3c0ef626 | 148 | static int last_was_cr; /* Last character was a newline. */ |
22616013 | 149 | static int exit_status; /* Used to store the command exit status. */ |
150 | static int stdin_eof; /* EOF has been encountered on stderr. */ | |
3c0ef626 | 151 | static Buffer stdin_buffer; /* Buffer for stdin data. */ |
152 | static Buffer stdout_buffer; /* Buffer for stdout data. */ | |
153 | static Buffer stderr_buffer; /* Buffer for stderr data. */ | |
3c0ef626 | 154 | static u_int buffer_high;/* Soft max buffer size. */ |
155 | static int connection_in; /* Connection to server (input). */ | |
156 | static int connection_out; /* Connection to server (output). */ | |
157 | static int need_rekeying; /* Set to non-zero if rekeying is requested. */ | |
158 | static int session_closed = 0; /* In SSH2: login session closed. */ | |
159 | ||
160 | static void client_init_dispatch(void); | |
161 | int session_ident = -1; | |
162 | ||
22616013 | 163 | /* Track escape per proto2 channel */ |
164 | struct escape_filter_ctx { | |
165 | int escape_pending; | |
166 | int escape_char; | |
c9f39d2c | 167 | }; |
168 | ||
22616013 | 169 | /* Context for channel confirmation replies */ |
170 | struct channel_reply_ctx { | |
171 | const char *request_type; | |
172 | int id, do_close; | |
173 | }; | |
174 | ||
175 | /* Global request success/failure callbacks */ | |
176 | struct global_confirm { | |
177 | TAILQ_ENTRY(global_confirm) entry; | |
178 | global_confirm_cb *cb; | |
179 | void *ctx; | |
180 | int ref_count; | |
181 | }; | |
182 | TAILQ_HEAD(global_confirms, global_confirm); | |
183 | static struct global_confirms global_confirms = | |
184 | TAILQ_HEAD_INITIALIZER(global_confirms); | |
185 | ||
3c0ef626 | 186 | /*XXX*/ |
187 | extern Kex *xxx_kex; | |
188 | ||
c9f39d2c | 189 | void ssh_process_session2_setup(int, int, int, Buffer *); |
190 | ||
3c0ef626 | 191 | /* Restores stdin to blocking mode. */ |
192 | ||
193 | static void | |
194 | leave_non_blocking(void) | |
195 | { | |
196 | if (in_non_blocking_mode) { | |
c9f39d2c | 197 | unset_nonblock(fileno(stdin)); |
3c0ef626 | 198 | in_non_blocking_mode = 0; |
3c0ef626 | 199 | } |
200 | } | |
201 | ||
202 | /* Puts stdin terminal in non-blocking mode. */ | |
203 | ||
204 | static void | |
205 | enter_non_blocking(void) | |
206 | { | |
207 | in_non_blocking_mode = 1; | |
c9f39d2c | 208 | set_nonblock(fileno(stdin)); |
3c0ef626 | 209 | } |
210 | ||
211 | /* | |
212 | * Signal handler for the window change signal (SIGWINCH). This just sets a | |
213 | * flag indicating that the window has changed. | |
214 | */ | |
9108f8d9 | 215 | /*ARGSUSED */ |
3c0ef626 | 216 | static void |
217 | window_change_handler(int sig) | |
218 | { | |
219 | received_window_change_signal = 1; | |
220 | signal(SIGWINCH, window_change_handler); | |
221 | } | |
222 | ||
223 | /* | |
224 | * Signal handler for signals that cause the program to terminate. These | |
225 | * signals must be trapped to restore terminal modes. | |
226 | */ | |
9108f8d9 | 227 | /*ARGSUSED */ |
3c0ef626 | 228 | static void |
229 | signal_handler(int sig) | |
230 | { | |
231 | received_signal = sig; | |
232 | quit_pending = 1; | |
233 | } | |
234 | ||
235 | /* | |
236 | * Returns current time in seconds from Jan 1, 1970 with the maximum | |
237 | * available resolution. | |
238 | */ | |
239 | ||
240 | static double | |
241 | get_current_time(void) | |
242 | { | |
243 | struct timeval tv; | |
244 | gettimeofday(&tv, NULL); | |
245 | return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0; | |
246 | } | |
247 | ||
665a873d | 248 | #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1" |
249 | void | |
250 | client_x11_get_proto(const char *display, const char *xauth_path, | |
251 | u_int trusted, char **_proto, char **_data) | |
252 | { | |
253 | char cmd[1024]; | |
254 | char line[512]; | |
255 | char xdisplay[512]; | |
256 | static char proto[512], data[512]; | |
257 | FILE *f; | |
258 | int got_data = 0, generated = 0, do_unlink = 0, i; | |
259 | char *xauthdir, *xauthfile; | |
260 | struct stat st; | |
261 | ||
262 | xauthdir = xauthfile = NULL; | |
263 | *_proto = proto; | |
264 | *_data = data; | |
265 | proto[0] = data[0] = '\0'; | |
266 | ||
267 | if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) { | |
268 | debug("No xauth program."); | |
269 | } else { | |
270 | if (display == NULL) { | |
271 | debug("x11_get_proto: DISPLAY not set"); | |
272 | return; | |
273 | } | |
274 | /* | |
275 | * Handle FamilyLocal case where $DISPLAY does | |
276 | * not match an authorization entry. For this we | |
277 | * just try "xauth list unix:displaynum.screennum". | |
278 | * XXX: "localhost" match to determine FamilyLocal | |
279 | * is not perfect. | |
280 | */ | |
281 | if (strncmp(display, "localhost:", 10) == 0) { | |
282 | snprintf(xdisplay, sizeof(xdisplay), "unix:%s", | |
283 | display + 10); | |
284 | display = xdisplay; | |
285 | } | |
286 | if (trusted == 0) { | |
287 | xauthdir = xmalloc(MAXPATHLEN); | |
288 | xauthfile = xmalloc(MAXPATHLEN); | |
289 | strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN); | |
290 | if (mkdtemp(xauthdir) != NULL) { | |
291 | do_unlink = 1; | |
292 | snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile", | |
293 | xauthdir); | |
294 | snprintf(cmd, sizeof(cmd), | |
295 | "%s -f %s generate %s " SSH_X11_PROTO | |
296 | " untrusted timeout 1200 2>" _PATH_DEVNULL, | |
297 | xauth_path, xauthfile, display); | |
298 | debug2("x11_get_proto: %s", cmd); | |
299 | if (system(cmd) == 0) | |
300 | generated = 1; | |
301 | } | |
302 | } | |
d4487008 | 303 | |
304 | /* | |
305 | * When in untrusted mode, we read the cookie only if it was | |
306 | * successfully generated as an untrusted one in the step | |
307 | * above. | |
308 | */ | |
309 | if (trusted || generated) { | |
310 | snprintf(cmd, sizeof(cmd), | |
311 | "%s %s%s list %s 2>" _PATH_DEVNULL, | |
312 | xauth_path, | |
313 | generated ? "-f " : "" , | |
314 | generated ? xauthfile : "", | |
315 | display); | |
316 | debug2("x11_get_proto: %s", cmd); | |
317 | f = popen(cmd, "r"); | |
318 | if (f && fgets(line, sizeof(line), f) && | |
319 | sscanf(line, "%*s %511s %511s", proto, data) == 2) | |
320 | got_data = 1; | |
321 | if (f) | |
322 | pclose(f); | |
323 | } else | |
324 | error("Warning: untrusted X11 forwarding setup failed: " | |
325 | "xauth key data not generated"); | |
665a873d | 326 | } |
327 | ||
328 | if (do_unlink) { | |
329 | unlink(xauthfile); | |
330 | rmdir(xauthdir); | |
331 | } | |
332 | if (xauthdir) | |
333 | xfree(xauthdir); | |
334 | if (xauthfile) | |
335 | xfree(xauthfile); | |
336 | ||
337 | /* | |
338 | * If we didn't get authentication data, just make up some | |
339 | * data. The forwarding code will check the validity of the | |
340 | * response anyway, and substitute this data. The X11 | |
341 | * server, however, will ignore this fake data and use | |
342 | * whatever authentication mechanisms it was using otherwise | |
343 | * for the local connection. | |
344 | */ | |
345 | if (!got_data) { | |
346 | u_int32_t rnd = 0; | |
347 | ||
348 | logit("Warning: No xauth data; " | |
349 | "using fake authentication data for X11 forwarding."); | |
350 | strlcpy(proto, SSH_X11_PROTO, sizeof proto); | |
351 | for (i = 0; i < 16; i++) { | |
352 | if (i % 4 == 0) | |
353 | rnd = arc4random(); | |
354 | snprintf(data + 2 * i, sizeof data - 2 * i, "%02x", | |
355 | rnd & 0xff); | |
356 | rnd >>= 8; | |
357 | } | |
358 | } | |
359 | } | |
360 | ||
3c0ef626 | 361 | /* |
362 | * This is called when the interactive is entered. This checks if there is | |
363 | * an EOF coming on stdin. We must check this explicitly, as select() does | |
364 | * not appear to wake up when redirecting from /dev/null. | |
365 | */ | |
366 | ||
367 | static void | |
368 | client_check_initial_eof_on_stdin(void) | |
369 | { | |
370 | int len; | |
371 | char buf[1]; | |
372 | ||
373 | /* | |
374 | * If standard input is to be "redirected from /dev/null", we simply | |
375 | * mark that we have seen an EOF and send an EOF message to the | |
376 | * server. Otherwise, we try to read a single character; it appears | |
377 | * that for some files, such /dev/null, select() never wakes up for | |
378 | * read for this descriptor, which means that we never get EOF. This | |
379 | * way we will get the EOF if stdin comes from /dev/null or similar. | |
380 | */ | |
381 | if (stdin_null_flag) { | |
382 | /* Fake EOF on stdin. */ | |
383 | debug("Sending eof."); | |
384 | stdin_eof = 1; | |
385 | packet_start(SSH_CMSG_EOF); | |
386 | packet_send(); | |
387 | } else { | |
388 | enter_non_blocking(); | |
389 | ||
390 | /* Check for immediate EOF on stdin. */ | |
391 | len = read(fileno(stdin), buf, 1); | |
392 | if (len == 0) { | |
22616013 | 393 | /* |
394 | * EOF. Record that we have seen it and send | |
395 | * EOF to server. | |
396 | */ | |
3c0ef626 | 397 | debug("Sending eof."); |
398 | stdin_eof = 1; | |
399 | packet_start(SSH_CMSG_EOF); | |
400 | packet_send(); | |
401 | } else if (len > 0) { | |
402 | /* | |
403 | * Got data. We must store the data in the buffer, | |
404 | * and also process it as an escape character if | |
405 | * appropriate. | |
406 | */ | |
22616013 | 407 | if ((u_char) buf[0] == escape_char1) |
408 | escape_pending1 = 1; | |
3c0ef626 | 409 | else |
410 | buffer_append(&stdin_buffer, buf, 1); | |
411 | } | |
412 | leave_non_blocking(); | |
413 | } | |
414 | } | |
415 | ||
416 | ||
417 | /* | |
418 | * Make packets from buffered stdin data, and buffer them for sending to the | |
419 | * connection. | |
420 | */ | |
421 | ||
422 | static void | |
423 | client_make_packets_from_stdin_data(void) | |
424 | { | |
425 | u_int len; | |
426 | ||
427 | /* Send buffered stdin data to the server. */ | |
428 | while (buffer_len(&stdin_buffer) > 0 && | |
e9a17296 | 429 | packet_not_very_much_data_to_write()) { |
3c0ef626 | 430 | len = buffer_len(&stdin_buffer); |
431 | /* Keep the packets at reasonable size. */ | |
432 | if (len > packet_get_maxsize()) | |
433 | len = packet_get_maxsize(); | |
434 | packet_start(SSH_CMSG_STDIN_DATA); | |
435 | packet_put_string(buffer_ptr(&stdin_buffer), len); | |
436 | packet_send(); | |
437 | buffer_consume(&stdin_buffer, len); | |
3c0ef626 | 438 | /* If we have a pending EOF, send it now. */ |
439 | if (stdin_eof && buffer_len(&stdin_buffer) == 0) { | |
440 | packet_start(SSH_CMSG_EOF); | |
441 | packet_send(); | |
442 | } | |
443 | } | |
444 | } | |
445 | ||
446 | /* | |
447 | * Checks if the client window has changed, and sends a packet about it to | |
448 | * the server if so. The actual change is detected elsewhere (by a software | |
449 | * interrupt on Unix); this just checks the flag and sends a message if | |
450 | * appropriate. | |
451 | */ | |
452 | ||
453 | static void | |
454 | client_check_window_change(void) | |
455 | { | |
456 | struct winsize ws; | |
457 | ||
458 | if (! received_window_change_signal) | |
459 | return; | |
460 | /** XXX race */ | |
461 | received_window_change_signal = 0; | |
462 | ||
3c0ef626 | 463 | debug2("client_check_window_change: changed"); |
464 | ||
465 | if (compat20) { | |
c9f39d2c | 466 | channel_send_window_changes(); |
3c0ef626 | 467 | } else { |
c9f39d2c | 468 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) |
469 | return; | |
3c0ef626 | 470 | packet_start(SSH_CMSG_WINDOW_SIZE); |
9108f8d9 | 471 | packet_put_int((u_int)ws.ws_row); |
472 | packet_put_int((u_int)ws.ws_col); | |
473 | packet_put_int((u_int)ws.ws_xpixel); | |
474 | packet_put_int((u_int)ws.ws_ypixel); | |
3c0ef626 | 475 | packet_send(); |
476 | } | |
477 | } | |
478 | ||
cdd66111 | 479 | static void |
480 | client_global_request_reply(int type, u_int32_t seq, void *ctxt) | |
481 | { | |
22616013 | 482 | struct global_confirm *gc; |
483 | ||
484 | if ((gc = TAILQ_FIRST(&global_confirms)) == NULL) | |
485 | return; | |
486 | if (gc->cb != NULL) | |
487 | gc->cb(type, seq, gc->ctx); | |
488 | if (--gc->ref_count <= 0) { | |
489 | TAILQ_REMOVE(&global_confirms, gc, entry); | |
490 | bzero(gc, sizeof(*gc)); | |
491 | xfree(gc); | |
492 | } | |
493 | ||
47686178 | 494 | keep_alive_timeouts = 0; |
cdd66111 | 495 | } |
496 | ||
497 | static void | |
498 | server_alive_check(void) | |
499 | { | |
47686178 | 500 | if (++keep_alive_timeouts > options.server_alive_count_max) { |
ff7ec503 | 501 | logit("Timeout, server not responding."); |
502 | cleanup_exit(255); | |
503 | } | |
cdd66111 | 504 | packet_start(SSH2_MSG_GLOBAL_REQUEST); |
505 | packet_put_cstring("keepalive@openssh.com"); | |
506 | packet_put_char(1); /* boolean: want reply */ | |
507 | packet_send(); | |
22616013 | 508 | /* Insert an empty placeholder to maintain ordering */ |
509 | client_register_global_confirm(NULL, NULL); | |
cdd66111 | 510 | } |
511 | ||
3c0ef626 | 512 | /* |
513 | * Waits until the client can do something (some data becomes available on | |
514 | * one of the file descriptors). | |
515 | */ | |
3c0ef626 | 516 | static void |
517 | client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp, | |
c9f39d2c | 518 | int *maxfdp, u_int *nallocp, int rekeying) |
3c0ef626 | 519 | { |
cdd66111 | 520 | struct timeval tv, *tvp; |
521 | int ret; | |
522 | ||
3c0ef626 | 523 | /* Add any selections by the channel mechanism. */ |
524 | channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying); | |
525 | ||
526 | if (!compat20) { | |
527 | /* Read from the connection, unless our buffers are full. */ | |
528 | if (buffer_len(&stdout_buffer) < buffer_high && | |
529 | buffer_len(&stderr_buffer) < buffer_high && | |
530 | channel_not_very_much_buffered_data()) | |
531 | FD_SET(connection_in, *readsetp); | |
532 | /* | |
533 | * Read from stdin, unless we have seen EOF or have very much | |
534 | * buffered data to send to the server. | |
535 | */ | |
536 | if (!stdin_eof && packet_not_very_much_data_to_write()) | |
537 | FD_SET(fileno(stdin), *readsetp); | |
538 | ||
539 | /* Select stdout/stderr if have data in buffer. */ | |
540 | if (buffer_len(&stdout_buffer) > 0) | |
541 | FD_SET(fileno(stdout), *writesetp); | |
542 | if (buffer_len(&stderr_buffer) > 0) | |
543 | FD_SET(fileno(stderr), *writesetp); | |
544 | } else { | |
545 | /* channel_prepare_select could have closed the last channel */ | |
546 | if (session_closed && !channel_still_open() && | |
547 | !packet_have_data_to_write()) { | |
548 | /* clear mask since we did not call select() */ | |
549 | memset(*readsetp, 0, *nallocp); | |
550 | memset(*writesetp, 0, *nallocp); | |
551 | return; | |
552 | } else { | |
553 | FD_SET(connection_in, *readsetp); | |
554 | } | |
555 | } | |
556 | ||
557 | /* Select server connection if have data to write to the server. */ | |
558 | if (packet_have_data_to_write()) | |
559 | FD_SET(connection_out, *writesetp); | |
560 | ||
22616013 | 561 | if (muxserver_sock != -1) |
562 | FD_SET(muxserver_sock, *readsetp); | |
c9f39d2c | 563 | |
3c0ef626 | 564 | /* |
565 | * Wait for something to happen. This will suspend the process until | |
566 | * some selected descriptor can be read, written, or has some other | |
cdd66111 | 567 | * event pending. |
3c0ef626 | 568 | */ |
569 | ||
cdd66111 | 570 | if (options.server_alive_interval == 0 || !compat20) |
571 | tvp = NULL; | |
c9f39d2c | 572 | else { |
cdd66111 | 573 | tv.tv_sec = options.server_alive_interval; |
574 | tv.tv_usec = 0; | |
575 | tvp = &tv; | |
576 | } | |
577 | ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp); | |
578 | if (ret < 0) { | |
3c0ef626 | 579 | char buf[100]; |
580 | ||
581 | /* | |
582 | * We have to clear the select masks, because we return. | |
583 | * We have to return, because the mainloop checks for the flags | |
584 | * set by the signal handlers. | |
585 | */ | |
586 | memset(*readsetp, 0, *nallocp); | |
587 | memset(*writesetp, 0, *nallocp); | |
588 | ||
589 | if (errno == EINTR) | |
590 | return; | |
591 | /* Note: we might still have data in the buffers. */ | |
592 | snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno)); | |
593 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
594 | quit_pending = 1; | |
cdd66111 | 595 | } else if (ret == 0) |
596 | server_alive_check(); | |
3c0ef626 | 597 | } |
598 | ||
599 | static void | |
600 | client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr) | |
601 | { | |
3c0ef626 | 602 | /* Flush stdout and stderr buffers. */ |
603 | if (buffer_len(bout) > 0) | |
22616013 | 604 | atomicio(vwrite, fileno(stdout), buffer_ptr(bout), |
605 | buffer_len(bout)); | |
3c0ef626 | 606 | if (buffer_len(berr) > 0) |
22616013 | 607 | atomicio(vwrite, fileno(stderr), buffer_ptr(berr), |
608 | buffer_len(berr)); | |
3c0ef626 | 609 | |
610 | leave_raw_mode(); | |
611 | ||
612 | /* | |
613 | * Free (and clear) the buffer to reduce the amount of data that gets | |
614 | * written to swap. | |
615 | */ | |
616 | buffer_free(bin); | |
617 | buffer_free(bout); | |
618 | buffer_free(berr); | |
619 | ||
3c0ef626 | 620 | /* Send the suspend signal to the program itself. */ |
621 | kill(getpid(), SIGTSTP); | |
622 | ||
996d5e62 | 623 | /* Reset window sizes in case they have changed */ |
624 | received_window_change_signal = 1; | |
3c0ef626 | 625 | |
626 | /* OK, we have been continued by the user. Reinitialize buffers. */ | |
627 | buffer_init(bin); | |
628 | buffer_init(bout); | |
629 | buffer_init(berr); | |
630 | ||
631 | enter_raw_mode(); | |
632 | } | |
633 | ||
634 | static void | |
9108f8d9 | 635 | client_process_net_input(fd_set *readset) |
3c0ef626 | 636 | { |
637 | int len; | |
638 | char buf[8192]; | |
639 | ||
640 | /* | |
641 | * Read input from the server, and add any such data to the buffer of | |
642 | * the packet subsystem. | |
643 | */ | |
644 | if (FD_ISSET(connection_in, readset)) { | |
645 | /* Read as much as possible. */ | |
646 | len = read(connection_in, buf, sizeof(buf)); | |
647 | if (len == 0) { | |
22616013 | 648 | /* |
649 | * Received EOF. The remote host has closed the | |
650 | * connection. | |
651 | */ | |
652 | snprintf(buf, sizeof buf, | |
653 | "Connection to %.300s closed by remote host.\r\n", | |
654 | host); | |
3c0ef626 | 655 | buffer_append(&stderr_buffer, buf, strlen(buf)); |
656 | quit_pending = 1; | |
657 | return; | |
658 | } | |
659 | /* | |
660 | * There is a kernel bug on Solaris that causes select to | |
661 | * sometimes wake up even though there is no data available. | |
662 | */ | |
22616013 | 663 | if (len < 0 && |
664 | (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK)) | |
3c0ef626 | 665 | len = 0; |
666 | ||
667 | if (len < 0) { | |
22616013 | 668 | /* |
669 | * An error has encountered. Perhaps there is a | |
670 | * network problem. | |
671 | */ | |
672 | snprintf(buf, sizeof buf, | |
673 | "Read from remote host %.300s: %.100s\r\n", | |
674 | host, strerror(errno)); | |
3c0ef626 | 675 | buffer_append(&stderr_buffer, buf, strlen(buf)); |
676 | quit_pending = 1; | |
677 | return; | |
678 | } | |
679 | packet_process_incoming(buf, len); | |
680 | } | |
681 | } | |
682 | ||
c9f39d2c | 683 | static void |
22616013 | 684 | client_status_confirm(int type, Channel *c, void *ctx) |
c9f39d2c | 685 | { |
22616013 | 686 | struct channel_reply_ctx *cr = (struct channel_reply_ctx *)ctx; |
687 | char errmsg[256]; | |
688 | int tochan; | |
689 | ||
690 | /* XXX supress on mux _client_ quietmode */ | |
691 | tochan = options.log_level >= SYSLOG_LEVEL_ERROR && | |
692 | c->ctl_fd != -1 && c->extended_usage == CHAN_EXTENDED_WRITE; | |
693 | ||
694 | if (type == SSH2_MSG_CHANNEL_SUCCESS) { | |
695 | debug2("%s request accepted on channel %d", | |
696 | cr->request_type, c->self); | |
697 | } else if (type == SSH2_MSG_CHANNEL_FAILURE) { | |
698 | if (tochan) { | |
699 | snprintf(errmsg, sizeof(errmsg), | |
700 | "%s request failed\r\n", cr->request_type); | |
701 | } else { | |
702 | snprintf(errmsg, sizeof(errmsg), | |
703 | "%s request failed on channel %d", | |
704 | cr->request_type, c->self); | |
705 | } | |
706 | /* If error occurred on primary session channel, then exit */ | |
707 | if (cr->do_close && c->self == session_ident) | |
708 | fatal("%s", errmsg); | |
709 | /* If error occurred on mux client, append to their stderr */ | |
710 | if (tochan) | |
711 | buffer_append(&c->extended, errmsg, strlen(errmsg)); | |
712 | else | |
713 | error("%s", errmsg); | |
714 | if (cr->do_close) { | |
715 | chan_read_failed(c); | |
716 | chan_write_failed(c); | |
717 | } | |
c9f39d2c | 718 | } |
22616013 | 719 | xfree(cr); |
c9f39d2c | 720 | } |
721 | ||
722 | static void | |
22616013 | 723 | client_abandon_status_confirm(Channel *c, void *ctx) |
c9f39d2c | 724 | { |
22616013 | 725 | xfree(ctx); |
c9f39d2c | 726 | } |
727 | ||
728 | static void | |
22616013 | 729 | client_expect_confirm(int id, const char *request, int do_close) |
c9f39d2c | 730 | { |
22616013 | 731 | struct channel_reply_ctx *cr = xmalloc(sizeof(*cr)); |
c9f39d2c | 732 | |
22616013 | 733 | cr->request_type = request; |
734 | cr->do_close = do_close; | |
c9f39d2c | 735 | |
22616013 | 736 | channel_register_status_confirm(id, client_status_confirm, |
737 | client_abandon_status_confirm, cr); | |
738 | } | |
c9f39d2c | 739 | |
22616013 | 740 | void |
741 | client_register_global_confirm(global_confirm_cb *cb, void *ctx) | |
742 | { | |
743 | struct global_confirm *gc, *last_gc; | |
744 | ||
745 | /* Coalesce identical callbacks */ | |
746 | last_gc = TAILQ_LAST(&global_confirms, global_confirms); | |
747 | if (last_gc && last_gc->cb == cb && last_gc->ctx == ctx) { | |
748 | if (++last_gc->ref_count >= INT_MAX) | |
749 | fatal("%s: last_gc->ref_count = %d", | |
750 | __func__, last_gc->ref_count); | |
c9f39d2c | 751 | return; |
752 | } | |
c9f39d2c | 753 | |
22616013 | 754 | gc = xmalloc(sizeof(*gc)); |
755 | gc->cb = cb; | |
756 | gc->ctx = ctx; | |
757 | gc->ref_count = 1; | |
758 | TAILQ_INSERT_TAIL(&global_confirms, gc, entry); | |
c9f39d2c | 759 | } |
760 | ||
700318f3 | 761 | static void |
762 | process_cmdline(void) | |
763 | { | |
764 | void (*handler)(int); | |
996d5e62 | 765 | char *s, *cmd, *cancel_host; |
c9f39d2c | 766 | int delete = 0; |
91d9cdd3 | 767 | int local = 0, remote = 0, dynamic = 0; |
768 | int cancel_port; | |
996d5e62 | 769 | Forward fwd; |
700318f3 | 770 | |
47686178 | 771 | bzero(&fwd, sizeof(fwd)); |
772 | fwd.listen_host = fwd.connect_host = NULL; | |
773 | ||
700318f3 | 774 | leave_raw_mode(); |
f5799ae1 | 775 | handler = signal(SIGINT, SIG_IGN); |
700318f3 | 776 | cmd = s = read_passphrase("\r\nssh> ", RP_ECHO); |
777 | if (s == NULL) | |
778 | goto out; | |
d4487008 | 779 | while (isspace(*s)) |
700318f3 | 780 | s++; |
c9f39d2c | 781 | if (*s == '-') |
782 | s++; /* Skip cmdline '-', if any */ | |
783 | if (*s == '\0') | |
784 | goto out; | |
785 | ||
786 | if (*s == 'h' || *s == 'H' || *s == '?') { | |
787 | logit("Commands:"); | |
9108f8d9 | 788 | logit(" -L[bind_address:]port:host:hostport " |
789 | "Request local forward"); | |
790 | logit(" -R[bind_address:]port:host:hostport " | |
791 | "Request remote forward"); | |
91d9cdd3 | 792 | logit(" -D[bind_address:]port " |
793 | "Request dynamic forward"); | |
9108f8d9 | 794 | logit(" -KR[bind_address:]port " |
795 | "Cancel remote forward"); | |
2c06c99b | 796 | if (!options.permit_local_command) |
797 | goto out; | |
9108f8d9 | 798 | logit(" !args " |
799 | "Execute local command"); | |
2c06c99b | 800 | goto out; |
801 | } | |
802 | ||
803 | if (*s == '!' && options.permit_local_command) { | |
804 | s++; | |
805 | ssh_local_cmd(s); | |
700318f3 | 806 | goto out; |
c9f39d2c | 807 | } |
808 | ||
809 | if (*s == 'K') { | |
810 | delete = 1; | |
811 | s++; | |
812 | } | |
91d9cdd3 | 813 | if (*s == 'L') |
814 | local = 1; | |
815 | else if (*s == 'R') | |
816 | remote = 1; | |
817 | else if (*s == 'D') | |
818 | dynamic = 1; | |
819 | else { | |
0fff78ff | 820 | logit("Invalid command."); |
700318f3 | 821 | goto out; |
822 | } | |
91d9cdd3 | 823 | |
824 | if ((local || dynamic) && delete) { | |
c9f39d2c | 825 | logit("Not supported."); |
826 | goto out; | |
827 | } | |
91d9cdd3 | 828 | if (remote && delete && !compat20) { |
0fff78ff | 829 | logit("Not supported for SSH protocol version 1."); |
700318f3 | 830 | goto out; |
831 | } | |
c9f39d2c | 832 | |
d4487008 | 833 | while (isspace(*++s)) |
834 | ; | |
700318f3 | 835 | |
c9f39d2c | 836 | if (delete) { |
996d5e62 | 837 | cancel_port = 0; |
838 | cancel_host = hpdelim(&s); /* may be NULL */ | |
839 | if (s != NULL) { | |
840 | cancel_port = a2port(s); | |
841 | cancel_host = cleanhostname(cancel_host); | |
842 | } else { | |
843 | cancel_port = a2port(cancel_host); | |
844 | cancel_host = NULL; | |
c9f39d2c | 845 | } |
91d9cdd3 | 846 | if (cancel_port <= 0) { |
996d5e62 | 847 | logit("Bad forwarding close port"); |
c9f39d2c | 848 | goto out; |
849 | } | |
996d5e62 | 850 | channel_request_rforward_cancel(cancel_host, cancel_port); |
c9f39d2c | 851 | } else { |
91d9cdd3 | 852 | if (!parse_forward(&fwd, s, dynamic, remote)) { |
c9f39d2c | 853 | logit("Bad forwarding specification."); |
854 | goto out; | |
855 | } | |
91d9cdd3 | 856 | if (local || dynamic) { |
996d5e62 | 857 | if (channel_setup_local_fwd_listener(fwd.listen_host, |
858 | fwd.listen_port, fwd.connect_host, | |
859 | fwd.connect_port, options.gateway_ports) < 0) { | |
c9f39d2c | 860 | logit("Port forwarding failed."); |
861 | goto out; | |
862 | } | |
996d5e62 | 863 | } else { |
9108f8d9 | 864 | if (channel_request_remote_forwarding(fwd.listen_host, |
996d5e62 | 865 | fwd.listen_port, fwd.connect_host, |
9108f8d9 | 866 | fwd.connect_port) < 0) { |
867 | logit("Port forwarding failed."); | |
868 | goto out; | |
869 | } | |
996d5e62 | 870 | } |
871 | ||
c9f39d2c | 872 | logit("Forwarding port."); |
873 | } | |
874 | ||
700318f3 | 875 | out: |
876 | signal(SIGINT, handler); | |
877 | enter_raw_mode(); | |
878 | if (cmd) | |
879 | xfree(cmd); | |
47686178 | 880 | if (fwd.listen_host != NULL) |
881 | xfree(fwd.listen_host); | |
882 | if (fwd.connect_host != NULL) | |
883 | xfree(fwd.connect_host); | |
700318f3 | 884 | } |
885 | ||
22616013 | 886 | /* |
887 | * Process the characters one by one, call with c==NULL for proto1 case. | |
888 | */ | |
3c0ef626 | 889 | static int |
22616013 | 890 | process_escapes(Channel *c, Buffer *bin, Buffer *bout, Buffer *berr, |
891 | char *buf, int len) | |
3c0ef626 | 892 | { |
893 | char string[1024]; | |
894 | pid_t pid; | |
895 | int bytes = 0; | |
896 | u_int i; | |
897 | u_char ch; | |
898 | char *s; | |
22616013 | 899 | int *escape_pendingp, escape_char; |
900 | struct escape_filter_ctx *efc; | |
3c0ef626 | 901 | |
22616013 | 902 | if (c == NULL) { |
903 | escape_pendingp = &escape_pending1; | |
904 | escape_char = escape_char1; | |
905 | } else { | |
906 | if (c->filter_ctx == NULL) | |
907 | return 0; | |
908 | efc = (struct escape_filter_ctx *)c->filter_ctx; | |
909 | escape_pendingp = &efc->escape_pending; | |
910 | escape_char = efc->escape_char; | |
911 | } | |
912 | ||
665a873d | 913 | if (len <= 0) |
914 | return (0); | |
915 | ||
916 | for (i = 0; i < (u_int)len; i++) { | |
3c0ef626 | 917 | /* Get one character at a time. */ |
918 | ch = buf[i]; | |
919 | ||
22616013 | 920 | if (*escape_pendingp) { |
3c0ef626 | 921 | /* We have previously seen an escape character. */ |
922 | /* Clear the flag now. */ | |
22616013 | 923 | *escape_pendingp = 0; |
3c0ef626 | 924 | |
925 | /* Process the escaped character. */ | |
926 | switch (ch) { | |
927 | case '.': | |
928 | /* Terminate the connection. */ | |
22616013 | 929 | snprintf(string, sizeof string, "%c.\r\n", |
930 | escape_char); | |
3c0ef626 | 931 | buffer_append(berr, string, strlen(string)); |
932 | ||
22616013 | 933 | if (c && c->ctl_fd != -1) { |
934 | chan_read_failed(c); | |
935 | chan_write_failed(c); | |
936 | return 0; | |
937 | } else | |
938 | quit_pending = 1; | |
3c0ef626 | 939 | return -1; |
940 | ||
941 | case 'Z' - 64: | |
22616013 | 942 | /* XXX support this for mux clients */ |
943 | if (c && c->ctl_fd != -1) { | |
944 | noescape: | |
945 | snprintf(string, sizeof string, | |
946 | "%c%c escape not available to " | |
947 | "multiplexed sessions\r\n", | |
948 | escape_char, ch); | |
949 | buffer_append(berr, string, | |
950 | strlen(string)); | |
951 | continue; | |
952 | } | |
953 | /* Suspend the program. Inform the user */ | |
954 | snprintf(string, sizeof string, | |
955 | "%c^Z [suspend ssh]\r\n", escape_char); | |
3c0ef626 | 956 | buffer_append(berr, string, strlen(string)); |
957 | ||
958 | /* Restore terminal modes and suspend. */ | |
959 | client_suspend_self(bin, bout, berr); | |
960 | ||
961 | /* We have been continued. */ | |
962 | continue; | |
963 | ||
0fff78ff | 964 | case 'B': |
965 | if (compat20) { | |
966 | snprintf(string, sizeof string, | |
967 | "%cB\r\n", escape_char); | |
968 | buffer_append(berr, string, | |
969 | strlen(string)); | |
970 | channel_request_start(session_ident, | |
971 | "break", 0); | |
972 | packet_put_int(1000); | |
973 | packet_send(); | |
974 | } | |
975 | continue; | |
976 | ||
3c0ef626 | 977 | case 'R': |
978 | if (compat20) { | |
979 | if (datafellows & SSH_BUG_NOREKEY) | |
22616013 | 980 | logit("Server does not " |
981 | "support re-keying"); | |
3c0ef626 | 982 | else |
983 | need_rekeying = 1; | |
984 | } | |
985 | continue; | |
986 | ||
987 | case '&': | |
22616013 | 988 | if (c && c->ctl_fd != -1) |
989 | goto noescape; | |
3c0ef626 | 990 | /* |
22616013 | 991 | * Detach the program (continue to serve |
992 | * connections, but put in background and no | |
993 | * more new connections). | |
3c0ef626 | 994 | */ |
995 | /* Restore tty modes. */ | |
996 | leave_raw_mode(); | |
997 | ||
998 | /* Stop listening for new connections. */ | |
999 | channel_stop_listening(); | |
1000 | ||
1001 | snprintf(string, sizeof string, | |
1002 | "%c& [backgrounded]\n", escape_char); | |
1003 | buffer_append(berr, string, strlen(string)); | |
1004 | ||
1005 | /* Fork into background. */ | |
1006 | pid = fork(); | |
1007 | if (pid < 0) { | |
1008 | error("fork: %.100s", strerror(errno)); | |
1009 | continue; | |
1010 | } | |
1011 | if (pid != 0) { /* This is the parent. */ | |
1012 | /* The parent just exits. */ | |
1013 | exit(0); | |
1014 | } | |
1015 | /* The child continues serving connections. */ | |
1016 | if (compat20) { | |
1017 | buffer_append(bin, "\004", 1); | |
1018 | /* fake EOF on stdin */ | |
1019 | return -1; | |
1020 | } else if (!stdin_eof) { | |
1021 | /* | |
22616013 | 1022 | * Sending SSH_CMSG_EOF alone does not |
1023 | * always appear to be enough. So we | |
1024 | * try to send an EOF character first. | |
3c0ef626 | 1025 | */ |
1026 | packet_start(SSH_CMSG_STDIN_DATA); | |
1027 | packet_put_string("\004", 1); | |
1028 | packet_send(); | |
1029 | /* Close stdin. */ | |
1030 | stdin_eof = 1; | |
1031 | if (buffer_len(bin) == 0) { | |
1032 | packet_start(SSH_CMSG_EOF); | |
1033 | packet_send(); | |
1034 | } | |
1035 | } | |
1036 | continue; | |
1037 | ||
1038 | case '?': | |
22616013 | 1039 | if (c && c->ctl_fd != -1) { |
1040 | snprintf(string, sizeof string, | |
1041 | "%c?\r\n\ | |
1042 | Supported escape sequences:\r\n\ | |
1043 | %c. - terminate session\r\n\ | |
1044 | %cB - send a BREAK to the remote system\r\n\ | |
22616013 | 1045 | %cR - Request rekey (SSH protocol 2 only)\r\n\ |
1046 | %c# - list forwarded connections\r\n\ | |
1047 | %c? - this message\r\n\ | |
1048 | %c%c - send the escape character by typing it twice\r\n\ | |
1049 | (Note that escapes are only recognized immediately after newline.)\r\n", | |
1050 | escape_char, escape_char, | |
1051 | escape_char, escape_char, | |
1052 | escape_char, escape_char, | |
91d9cdd3 | 1053 | escape_char, escape_char); |
22616013 | 1054 | } else { |
1055 | snprintf(string, sizeof string, | |
3c0ef626 | 1056 | "%c?\r\n\ |
1057 | Supported escape sequences:\r\n\ | |
22616013 | 1058 | %c. - terminate connection (and any multiplexed sessions)\r\n\ |
1059 | %cB - send a BREAK to the remote system\r\n\ | |
1060 | %cC - open a command line\r\n\ | |
1061 | %cR - Request rekey (SSH protocol 2 only)\r\n\ | |
1062 | %c^Z - suspend ssh\r\n\ | |
1063 | %c# - list forwarded connections\r\n\ | |
1064 | %c& - background ssh (when waiting for connections to terminate)\r\n\ | |
1065 | %c? - this message\r\n\ | |
1066 | %c%c - send the escape character by typing it twice\r\n\ | |
3c0ef626 | 1067 | (Note that escapes are only recognized immediately after newline.)\r\n", |
22616013 | 1068 | escape_char, escape_char, |
1069 | escape_char, escape_char, | |
1070 | escape_char, escape_char, | |
1071 | escape_char, escape_char, | |
1072 | escape_char, escape_char, | |
1073 | escape_char); | |
1074 | } | |
3c0ef626 | 1075 | buffer_append(berr, string, strlen(string)); |
1076 | continue; | |
1077 | ||
1078 | case '#': | |
22616013 | 1079 | snprintf(string, sizeof string, "%c#\r\n", |
1080 | escape_char); | |
3c0ef626 | 1081 | buffer_append(berr, string, strlen(string)); |
1082 | s = channel_open_message(); | |
1083 | buffer_append(berr, s, strlen(s)); | |
1084 | xfree(s); | |
1085 | continue; | |
1086 | ||
700318f3 | 1087 | case 'C': |
91d9cdd3 | 1088 | if (c && c->ctl_fd != -1) |
1089 | goto noescape; | |
700318f3 | 1090 | process_cmdline(); |
1091 | continue; | |
1092 | ||
3c0ef626 | 1093 | default: |
1094 | if (ch != escape_char) { | |
1095 | buffer_put_char(bin, escape_char); | |
1096 | bytes++; | |
1097 | } | |
1098 | /* Escaped characters fall through here */ | |
1099 | break; | |
1100 | } | |
1101 | } else { | |
1102 | /* | |
22616013 | 1103 | * The previous character was not an escape char. |
1104 | * Check if this is an escape. | |
3c0ef626 | 1105 | */ |
1106 | if (last_was_cr && ch == escape_char) { | |
22616013 | 1107 | /* |
1108 | * It is. Set the flag and continue to | |
1109 | * next character. | |
1110 | */ | |
1111 | *escape_pendingp = 1; | |
3c0ef626 | 1112 | continue; |
1113 | } | |
1114 | } | |
1115 | ||
1116 | /* | |
1117 | * Normal character. Record whether it was a newline, | |
1118 | * and append it to the buffer. | |
1119 | */ | |
1120 | last_was_cr = (ch == '\r' || ch == '\n'); | |
1121 | buffer_put_char(bin, ch); | |
1122 | bytes++; | |
1123 | } | |
1124 | return bytes; | |
1125 | } | |
1126 | ||
1127 | static void | |
9108f8d9 | 1128 | client_process_input(fd_set *readset) |
3c0ef626 | 1129 | { |
1130 | int len; | |
1131 | char buf[8192]; | |
1132 | ||
1133 | /* Read input from stdin. */ | |
1134 | if (FD_ISSET(fileno(stdin), readset)) { | |
1135 | /* Read as much as possible. */ | |
1136 | len = read(fileno(stdin), buf, sizeof(buf)); | |
22616013 | 1137 | if (len < 0 && |
1138 | (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK)) | |
3c0ef626 | 1139 | return; /* we'll try again later */ |
1140 | if (len <= 0) { | |
1141 | /* | |
1142 | * Received EOF or error. They are treated | |
1143 | * similarly, except that an error message is printed | |
1144 | * if it was an error condition. | |
1145 | */ | |
1146 | if (len < 0) { | |
22616013 | 1147 | snprintf(buf, sizeof buf, "read: %.100s\r\n", |
1148 | strerror(errno)); | |
3c0ef626 | 1149 | buffer_append(&stderr_buffer, buf, strlen(buf)); |
1150 | } | |
1151 | /* Mark that we have seen EOF. */ | |
1152 | stdin_eof = 1; | |
1153 | /* | |
1154 | * Send an EOF message to the server unless there is | |
1155 | * data in the buffer. If there is data in the | |
1156 | * buffer, no message will be sent now. Code | |
1157 | * elsewhere will send the EOF when the buffer | |
1158 | * becomes empty if stdin_eof is set. | |
1159 | */ | |
1160 | if (buffer_len(&stdin_buffer) == 0) { | |
1161 | packet_start(SSH_CMSG_EOF); | |
1162 | packet_send(); | |
1163 | } | |
22616013 | 1164 | } else if (escape_char1 == SSH_ESCAPECHAR_NONE) { |
3c0ef626 | 1165 | /* |
1166 | * Normal successful read, and no escape character. | |
1167 | * Just append the data to buffer. | |
1168 | */ | |
1169 | buffer_append(&stdin_buffer, buf, len); | |
1170 | } else { | |
1171 | /* | |
22616013 | 1172 | * Normal, successful read. But we have an escape |
1173 | * character and have to process the characters one | |
1174 | * by one. | |
3c0ef626 | 1175 | */ |
22616013 | 1176 | if (process_escapes(NULL, &stdin_buffer, |
1177 | &stdout_buffer, &stderr_buffer, buf, len) == -1) | |
3c0ef626 | 1178 | return; |
1179 | } | |
1180 | } | |
1181 | } | |
1182 | ||
1183 | static void | |
9108f8d9 | 1184 | client_process_output(fd_set *writeset) |
3c0ef626 | 1185 | { |
1186 | int len; | |
1187 | char buf[100]; | |
1188 | ||
1189 | /* Write buffered output to stdout. */ | |
1190 | if (FD_ISSET(fileno(stdout), writeset)) { | |
1191 | /* Write as much data as possible. */ | |
1192 | len = write(fileno(stdout), buffer_ptr(&stdout_buffer), | |
1193 | buffer_len(&stdout_buffer)); | |
1194 | if (len <= 0) { | |
22616013 | 1195 | if (errno == EINTR || errno == EAGAIN || |
1196 | errno == EWOULDBLOCK) | |
3c0ef626 | 1197 | len = 0; |
1198 | else { | |
1199 | /* | |
1200 | * An error or EOF was encountered. Put an | |
1201 | * error message to stderr buffer. | |
1202 | */ | |
22616013 | 1203 | snprintf(buf, sizeof buf, |
1204 | "write stdout: %.50s\r\n", strerror(errno)); | |
3c0ef626 | 1205 | buffer_append(&stderr_buffer, buf, strlen(buf)); |
1206 | quit_pending = 1; | |
1207 | return; | |
1208 | } | |
1209 | } | |
1210 | /* Consume printed data from the buffer. */ | |
1211 | buffer_consume(&stdout_buffer, len); | |
3c0ef626 | 1212 | } |
1213 | /* Write buffered output to stderr. */ | |
1214 | if (FD_ISSET(fileno(stderr), writeset)) { | |
1215 | /* Write as much data as possible. */ | |
1216 | len = write(fileno(stderr), buffer_ptr(&stderr_buffer), | |
1217 | buffer_len(&stderr_buffer)); | |
1218 | if (len <= 0) { | |
22616013 | 1219 | if (errno == EINTR || errno == EAGAIN || |
1220 | errno == EWOULDBLOCK) | |
3c0ef626 | 1221 | len = 0; |
1222 | else { | |
22616013 | 1223 | /* |
1224 | * EOF or error, but can't even print | |
1225 | * error message. | |
1226 | */ | |
3c0ef626 | 1227 | quit_pending = 1; |
1228 | return; | |
1229 | } | |
1230 | } | |
1231 | /* Consume printed characters from the buffer. */ | |
1232 | buffer_consume(&stderr_buffer, len); | |
3c0ef626 | 1233 | } |
1234 | } | |
1235 | ||
1236 | /* | |
1237 | * Get packets from the connection input buffer, and process them as long as | |
1238 | * there are packets available. | |
1239 | * | |
1240 | * Any unknown packets received during the actual | |
1241 | * session cause the session to terminate. This is | |
1242 | * intended to make debugging easier since no | |
1243 | * confirmations are sent. Any compatible protocol | |
1244 | * extensions must be negotiated during the | |
1245 | * preparatory phase. | |
1246 | */ | |
1247 | ||
1248 | static void | |
1249 | client_process_buffered_input_packets(void) | |
1250 | { | |
22616013 | 1251 | dispatch_run(DISPATCH_NONBLOCK, &quit_pending, |
1252 | compat20 ? xxx_kex : NULL); | |
3c0ef626 | 1253 | } |
1254 | ||
1255 | /* scan buf[] for '~' before sending data to the peer */ | |
1256 | ||
22616013 | 1257 | /* Helper: allocate a new escape_filter_ctx and fill in its escape char */ |
1258 | void * | |
1259 | client_new_escape_filter_ctx(int escape_char) | |
3c0ef626 | 1260 | { |
22616013 | 1261 | struct escape_filter_ctx *ret; |
1262 | ||
1263 | ret = xmalloc(sizeof(*ret)); | |
1264 | ret->escape_pending = 0; | |
1265 | ret->escape_char = escape_char; | |
1266 | return (void *)ret; | |
1267 | } | |
1268 | ||
1269 | /* Free the escape filter context on channel free */ | |
1270 | void | |
1271 | client_filter_cleanup(int cid, void *ctx) | |
1272 | { | |
1273 | xfree(ctx); | |
1274 | } | |
1275 | ||
1276 | int | |
1277 | client_simple_escape_filter(Channel *c, char *buf, int len) | |
1278 | { | |
1279 | if (c->extended_usage != CHAN_EXTENDED_WRITE) | |
1280 | return 0; | |
1281 | ||
1282 | return process_escapes(c, &c->input, &c->output, &c->extended, | |
1283 | buf, len); | |
3c0ef626 | 1284 | } |
1285 | ||
1286 | static void | |
1287 | client_channel_closed(int id, void *arg) | |
1288 | { | |
3c0ef626 | 1289 | channel_cancel_cleanup(id); |
1290 | session_closed = 1; | |
cdd66111 | 1291 | leave_raw_mode(); |
3c0ef626 | 1292 | } |
1293 | ||
1294 | /* | |
1295 | * Implements the interactive session with the server. This is called after | |
1296 | * the user has been authenticated, and a command has been started on the | |
1297 | * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character | |
1298 | * used as an escape character for terminating or suspending the session. | |
1299 | */ | |
1300 | ||
1301 | int | |
1302 | client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id) | |
1303 | { | |
1304 | fd_set *readset = NULL, *writeset = NULL; | |
1305 | double start_time, total_time; | |
c9f39d2c | 1306 | int max_fd = 0, max_fd2 = 0, len, rekeying = 0; |
22616013 | 1307 | u_int64_t ibytes, obytes; |
c9f39d2c | 1308 | u_int nalloc = 0; |
3c0ef626 | 1309 | char buf[100]; |
1310 | ||
1311 | debug("Entering interactive session."); | |
1312 | ||
1313 | start_time = get_current_time(); | |
1314 | ||
1315 | /* Initialize variables. */ | |
22616013 | 1316 | escape_pending1 = 0; |
3c0ef626 | 1317 | last_was_cr = 1; |
1318 | exit_status = -1; | |
1319 | stdin_eof = 0; | |
1320 | buffer_high = 64 * 1024; | |
1321 | connection_in = packet_get_connection_in(); | |
1322 | connection_out = packet_get_connection_out(); | |
1323 | max_fd = MAX(connection_in, connection_out); | |
22616013 | 1324 | if (muxserver_sock != -1) |
1325 | max_fd = MAX(max_fd, muxserver_sock); | |
3c0ef626 | 1326 | |
1327 | if (!compat20) { | |
1328 | /* enable nonblocking unless tty */ | |
1329 | if (!isatty(fileno(stdin))) | |
1330 | set_nonblock(fileno(stdin)); | |
1331 | if (!isatty(fileno(stdout))) | |
1332 | set_nonblock(fileno(stdout)); | |
1333 | if (!isatty(fileno(stderr))) | |
1334 | set_nonblock(fileno(stderr)); | |
1335 | max_fd = MAX(max_fd, fileno(stdin)); | |
1336 | max_fd = MAX(max_fd, fileno(stdout)); | |
1337 | max_fd = MAX(max_fd, fileno(stderr)); | |
1338 | } | |
3c0ef626 | 1339 | quit_pending = 0; |
22616013 | 1340 | escape_char1 = escape_char_arg; |
3c0ef626 | 1341 | |
1342 | /* Initialize buffers. */ | |
1343 | buffer_init(&stdin_buffer); | |
1344 | buffer_init(&stdout_buffer); | |
1345 | buffer_init(&stderr_buffer); | |
1346 | ||
1347 | client_init_dispatch(); | |
1348 | ||
6a9b3198 | 1349 | /* |
1350 | * Set signal handlers, (e.g. to restore non-blocking mode) | |
1351 | * but don't overwrite SIG_IGN, matches behaviour from rsh(1) | |
1352 | */ | |
996d5e62 | 1353 | if (signal(SIGHUP, SIG_IGN) != SIG_IGN) |
1354 | signal(SIGHUP, signal_handler); | |
6a9b3198 | 1355 | if (signal(SIGINT, SIG_IGN) != SIG_IGN) |
1356 | signal(SIGINT, signal_handler); | |
1357 | if (signal(SIGQUIT, SIG_IGN) != SIG_IGN) | |
1358 | signal(SIGQUIT, signal_handler); | |
1359 | if (signal(SIGTERM, SIG_IGN) != SIG_IGN) | |
1360 | signal(SIGTERM, signal_handler); | |
996d5e62 | 1361 | signal(SIGWINCH, window_change_handler); |
3c0ef626 | 1362 | |
1363 | if (have_pty) | |
1364 | enter_raw_mode(); | |
1365 | ||
1366 | if (compat20) { | |
1367 | session_ident = ssh2_chan_id; | |
22616013 | 1368 | if (escape_char_arg != SSH_ESCAPECHAR_NONE) |
3c0ef626 | 1369 | channel_register_filter(session_ident, |
22616013 | 1370 | client_simple_escape_filter, NULL, |
1371 | client_filter_cleanup, | |
1372 | client_new_escape_filter_ctx(escape_char_arg)); | |
3c0ef626 | 1373 | if (session_ident != -1) |
1374 | channel_register_cleanup(session_ident, | |
2c06c99b | 1375 | client_channel_closed, 0); |
3c0ef626 | 1376 | } else { |
1377 | /* Check if we should immediately send eof on stdin. */ | |
1378 | client_check_initial_eof_on_stdin(); | |
1379 | } | |
1380 | ||
1381 | /* Main loop of the client for the interactive session mode. */ | |
1382 | while (!quit_pending) { | |
1383 | ||
1384 | /* Process buffered packets sent by the server. */ | |
1385 | client_process_buffered_input_packets(); | |
1386 | ||
1387 | if (compat20 && session_closed && !channel_still_open()) | |
1388 | break; | |
1389 | ||
1390 | rekeying = (xxx_kex != NULL && !xxx_kex->done); | |
1391 | ||
1392 | if (rekeying) { | |
1393 | debug("rekeying in progress"); | |
1394 | } else { | |
1395 | /* | |
1396 | * Make packets of buffered stdin data, and buffer | |
1397 | * them for sending to the server. | |
1398 | */ | |
1399 | if (!compat20) | |
1400 | client_make_packets_from_stdin_data(); | |
1401 | ||
1402 | /* | |
1403 | * Make packets from buffered channel data, and | |
1404 | * enqueue them for sending to the server. | |
1405 | */ | |
1406 | if (packet_not_very_much_data_to_write()) | |
1407 | channel_output_poll(); | |
1408 | ||
1409 | /* | |
1410 | * Check if the window size has changed, and buffer a | |
1411 | * message about it to the server if so. | |
1412 | */ | |
1413 | client_check_window_change(); | |
1414 | ||
1415 | if (quit_pending) | |
1416 | break; | |
1417 | } | |
1418 | /* | |
1419 | * Wait until we have something to do (something becomes | |
1420 | * available on one of the descriptors). | |
1421 | */ | |
1422 | max_fd2 = max_fd; | |
1423 | client_wait_until_can_do_something(&readset, &writeset, | |
1424 | &max_fd2, &nalloc, rekeying); | |
1425 | ||
1426 | if (quit_pending) | |
1427 | break; | |
1428 | ||
1429 | /* Do channel operations unless rekeying in progress. */ | |
1430 | if (!rekeying) { | |
1431 | channel_after_select(readset, writeset); | |
0fff78ff | 1432 | if (need_rekeying || packet_need_rekeying()) { |
1433 | debug("need rekeying"); | |
3c0ef626 | 1434 | xxx_kex->done = 0; |
1435 | kex_send_kexinit(xxx_kex); | |
1436 | need_rekeying = 0; | |
1437 | } | |
1438 | } | |
1439 | ||
1440 | /* Buffer input from the connection. */ | |
1441 | client_process_net_input(readset); | |
1442 | ||
c9f39d2c | 1443 | /* Accept control connections. */ |
22616013 | 1444 | if (muxserver_sock != -1 &&FD_ISSET(muxserver_sock, readset)) { |
1445 | if (muxserver_accept_control()) | |
1446 | quit_pending = 1; | |
1447 | } | |
c9f39d2c | 1448 | |
3c0ef626 | 1449 | if (quit_pending) |
1450 | break; | |
1451 | ||
1452 | if (!compat20) { | |
1453 | /* Buffer data from stdin */ | |
1454 | client_process_input(readset); | |
1455 | /* | |
1456 | * Process output to stdout and stderr. Output to | |
1457 | * the connection is processed elsewhere (above). | |
1458 | */ | |
1459 | client_process_output(writeset); | |
1460 | } | |
1461 | ||
22616013 | 1462 | /* |
1463 | * Send as much buffered packet data as possible to the | |
1464 | * sender. | |
1465 | */ | |
3c0ef626 | 1466 | if (FD_ISSET(connection_out, writeset)) |
1467 | packet_write_poll(); | |
1468 | } | |
1469 | if (readset) | |
1470 | xfree(readset); | |
1471 | if (writeset) | |
1472 | xfree(writeset); | |
1473 | ||
1474 | /* Terminate the session. */ | |
1475 | ||
1476 | /* Stop watching for window change. */ | |
996d5e62 | 1477 | signal(SIGWINCH, SIG_DFL); |
3c0ef626 | 1478 | |
1479 | channel_free_all(); | |
1480 | ||
1481 | if (have_pty) | |
1482 | leave_raw_mode(); | |
1483 | ||
1484 | /* restore blocking io */ | |
1485 | if (!isatty(fileno(stdin))) | |
1486 | unset_nonblock(fileno(stdin)); | |
1487 | if (!isatty(fileno(stdout))) | |
1488 | unset_nonblock(fileno(stdout)); | |
1489 | if (!isatty(fileno(stderr))) | |
1490 | unset_nonblock(fileno(stderr)); | |
1491 | ||
cdd66111 | 1492 | /* |
1493 | * If there was no shell or command requested, there will be no remote | |
1494 | * exit status to be returned. In that case, clear error code if the | |
1495 | * connection was deliberately terminated at this end. | |
1496 | */ | |
1497 | if (no_shell_flag && received_signal == SIGTERM) { | |
1498 | received_signal = 0; | |
1499 | exit_status = 0; | |
9cb1827b | 1500 | } |
12408a1b | 1501 | |
cdd66111 | 1502 | if (received_signal) |
1503 | fatal("Killed by signal %d.", (int) received_signal); | |
1504 | ||
3c0ef626 | 1505 | /* |
1506 | * In interactive mode (with pseudo tty) display a message indicating | |
1507 | * that the connection has been closed. | |
1508 | */ | |
1509 | if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) { | |
22616013 | 1510 | snprintf(buf, sizeof buf, |
1511 | "Connection to %.64s closed.\r\n", host); | |
3c0ef626 | 1512 | buffer_append(&stderr_buffer, buf, strlen(buf)); |
1513 | } | |
1514 | ||
1515 | /* Output any buffered data for stdout. */ | |
1516 | while (buffer_len(&stdout_buffer) > 0) { | |
1517 | len = write(fileno(stdout), buffer_ptr(&stdout_buffer), | |
1518 | buffer_len(&stdout_buffer)); | |
1519 | if (len <= 0) { | |
1520 | error("Write failed flushing stdout buffer."); | |
1521 | break; | |
1522 | } | |
1523 | buffer_consume(&stdout_buffer, len); | |
3c0ef626 | 1524 | } |
1525 | ||
1526 | /* Output any buffered data for stderr. */ | |
1527 | while (buffer_len(&stderr_buffer) > 0) { | |
1528 | len = write(fileno(stderr), buffer_ptr(&stderr_buffer), | |
1529 | buffer_len(&stderr_buffer)); | |
1530 | if (len <= 0) { | |
1531 | error("Write failed flushing stderr buffer."); | |
1532 | break; | |
1533 | } | |
1534 | buffer_consume(&stderr_buffer, len); | |
3c0ef626 | 1535 | } |
1536 | ||
1537 | /* Clear and free any buffers. */ | |
1538 | memset(buf, 0, sizeof(buf)); | |
1539 | buffer_free(&stdin_buffer); | |
1540 | buffer_free(&stdout_buffer); | |
1541 | buffer_free(&stderr_buffer); | |
1542 | ||
1543 | /* Report bytes transferred, and transfer rates. */ | |
1544 | total_time = get_current_time() - start_time; | |
22616013 | 1545 | packet_get_state(MODE_IN, NULL, NULL, NULL, &ibytes); |
1546 | packet_get_state(MODE_OUT, NULL, NULL, NULL, &obytes); | |
1547 | verbose("Transferred: sent %llu, received %llu bytes, in %.1f seconds", | |
1548 | obytes, ibytes, total_time); | |
3c0ef626 | 1549 | if (total_time > 0) |
22616013 | 1550 | verbose("Bytes per second: sent %.1f, received %.1f", |
1551 | obytes / total_time, ibytes / total_time); | |
3c0ef626 | 1552 | /* Return the exit status of the program. */ |
1553 | debug("Exit status %d", exit_status); | |
1554 | return exit_status; | |
1555 | } | |
1556 | ||
1557 | /*********/ | |
1558 | ||
1559 | static void | |
e9a17296 | 1560 | client_input_stdout_data(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 1561 | { |
1562 | u_int data_len; | |
1563 | char *data = packet_get_string(&data_len); | |
e9a17296 | 1564 | packet_check_eom(); |
3c0ef626 | 1565 | buffer_append(&stdout_buffer, data, data_len); |
1566 | memset(data, 0, data_len); | |
1567 | xfree(data); | |
1568 | } | |
1569 | static void | |
e9a17296 | 1570 | client_input_stderr_data(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 1571 | { |
1572 | u_int data_len; | |
1573 | char *data = packet_get_string(&data_len); | |
e9a17296 | 1574 | packet_check_eom(); |
3c0ef626 | 1575 | buffer_append(&stderr_buffer, data, data_len); |
1576 | memset(data, 0, data_len); | |
1577 | xfree(data); | |
1578 | } | |
1579 | static void | |
e9a17296 | 1580 | client_input_exit_status(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 1581 | { |
3c0ef626 | 1582 | exit_status = packet_get_int(); |
e9a17296 | 1583 | packet_check_eom(); |
3c0ef626 | 1584 | /* Acknowledge the exit. */ |
1585 | packet_start(SSH_CMSG_EXIT_CONFIRMATION); | |
1586 | packet_send(); | |
1587 | /* | |
1588 | * Must wait for packet to be sent since we are | |
1589 | * exiting the loop. | |
1590 | */ | |
1591 | packet_write_wait(); | |
1592 | /* Flag that we want to exit. */ | |
1593 | quit_pending = 1; | |
1594 | } | |
cdd66111 | 1595 | static void |
1596 | client_input_agent_open(int type, u_int32_t seq, void *ctxt) | |
1597 | { | |
1598 | Channel *c = NULL; | |
1599 | int remote_id, sock; | |
1600 | ||
1601 | /* Read the remote channel number from the message. */ | |
1602 | remote_id = packet_get_int(); | |
1603 | packet_check_eom(); | |
1604 | ||
1605 | /* | |
1606 | * Get a connection to the local authentication agent (this may again | |
1607 | * get forwarded). | |
1608 | */ | |
1609 | sock = ssh_get_authentication_socket(); | |
1610 | ||
1611 | /* | |
1612 | * If we could not connect the agent, send an error message back to | |
1613 | * the server. This should never happen unless the agent dies, | |
1614 | * because authentication forwarding is only enabled if we have an | |
1615 | * agent. | |
1616 | */ | |
1617 | if (sock >= 0) { | |
1618 | c = channel_new("", SSH_CHANNEL_OPEN, sock, sock, | |
1619 | -1, 0, 0, 0, "authentication agent connection", 1); | |
1620 | c->remote_id = remote_id; | |
1621 | c->force_drain = 1; | |
1622 | } | |
1623 | if (c == NULL) { | |
1624 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
1625 | packet_put_int(remote_id); | |
1626 | } else { | |
1627 | /* Send a confirmation to the remote host. */ | |
1628 | debug("Forwarding authentication connection."); | |
1629 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1630 | packet_put_int(remote_id); | |
1631 | packet_put_int(c->self); | |
1632 | } | |
1633 | packet_send(); | |
1634 | } | |
3c0ef626 | 1635 | |
1636 | static Channel * | |
1637 | client_request_forwarded_tcpip(const char *request_type, int rchan) | |
1638 | { | |
41b2f314 | 1639 | Channel *c = NULL; |
3c0ef626 | 1640 | char *listen_address, *originator_address; |
91d9cdd3 | 1641 | u_short listen_port, originator_port; |
3c0ef626 | 1642 | |
1643 | /* Get rest of the packet */ | |
1644 | listen_address = packet_get_string(NULL); | |
1645 | listen_port = packet_get_int(); | |
1646 | originator_address = packet_get_string(NULL); | |
1647 | originator_port = packet_get_int(); | |
e9a17296 | 1648 | packet_check_eom(); |
3c0ef626 | 1649 | |
22616013 | 1650 | debug("client_request_forwarded_tcpip: listen %s port %d, " |
1651 | "originator %s port %d", listen_address, listen_port, | |
1652 | originator_address, originator_port); | |
1653 | ||
1654 | c = channel_connect_by_listen_address(listen_port, | |
1655 | "forwarded-tcpip", originator_address); | |
3c0ef626 | 1656 | |
3c0ef626 | 1657 | xfree(originator_address); |
1658 | xfree(listen_address); | |
1659 | return c; | |
1660 | } | |
1661 | ||
41b2f314 | 1662 | static Channel * |
3c0ef626 | 1663 | client_request_x11(const char *request_type, int rchan) |
1664 | { | |
1665 | Channel *c = NULL; | |
1666 | char *originator; | |
91d9cdd3 | 1667 | u_short originator_port; |
3c0ef626 | 1668 | int sock; |
1669 | ||
1670 | if (!options.forward_x11) { | |
1671 | error("Warning: ssh server tried X11 forwarding."); | |
22616013 | 1672 | error("Warning: this is probably a break-in attempt by a " |
1673 | "malicious server."); | |
3c0ef626 | 1674 | return NULL; |
1675 | } | |
1676 | originator = packet_get_string(NULL); | |
1677 | if (datafellows & SSH_BUG_X11FWD) { | |
1678 | debug2("buggy server: x11 request w/o originator_port"); | |
1679 | originator_port = 0; | |
1680 | } else { | |
1681 | originator_port = packet_get_int(); | |
1682 | } | |
e9a17296 | 1683 | packet_check_eom(); |
3c0ef626 | 1684 | /* XXX check permission */ |
1685 | debug("client_request_x11: request from %s %d", originator, | |
1686 | originator_port); | |
1687 | xfree(originator); | |
1688 | sock = x11_connect_display(); | |
1689 | if (sock < 0) | |
1690 | return NULL; | |
1691 | c = channel_new("x11", | |
1692 | SSH_CHANNEL_X11_OPEN, sock, sock, -1, | |
0fff78ff | 1693 | CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1); |
3c0ef626 | 1694 | c->force_drain = 1; |
1695 | return c; | |
1696 | } | |
1697 | ||
41b2f314 | 1698 | static Channel * |
3c0ef626 | 1699 | client_request_agent(const char *request_type, int rchan) |
1700 | { | |
1701 | Channel *c = NULL; | |
1702 | int sock; | |
1703 | ||
1704 | if (!options.forward_agent) { | |
1705 | error("Warning: ssh server tried agent forwarding."); | |
22616013 | 1706 | error("Warning: this is probably a break-in attempt by a " |
1707 | "malicious server."); | |
3c0ef626 | 1708 | return NULL; |
1709 | } | |
799ae497 | 1710 | sock = ssh_get_authentication_socket(); |
3c0ef626 | 1711 | if (sock < 0) |
1712 | return NULL; | |
1713 | c = channel_new("authentication agent connection", | |
1714 | SSH_CHANNEL_OPEN, sock, sock, -1, | |
47686178 | 1715 | CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, |
0fff78ff | 1716 | "authentication agent connection", 1); |
3c0ef626 | 1717 | c->force_drain = 1; |
1718 | return c; | |
1719 | } | |
1720 | ||
d4487008 | 1721 | int |
1722 | client_request_tun_fwd(int tun_mode, int local_tun, int remote_tun) | |
1723 | { | |
1724 | Channel *c; | |
1725 | int fd; | |
1726 | ||
1727 | if (tun_mode == SSH_TUNMODE_NO) | |
1728 | return 0; | |
1729 | ||
1730 | if (!compat20) { | |
91d9cdd3 | 1731 | error("Tunnel forwarding is not supported for protocol 1"); |
d4487008 | 1732 | return -1; |
1733 | } | |
1734 | ||
1735 | debug("Requesting tun unit %d in mode %d", local_tun, tun_mode); | |
1736 | ||
1737 | /* Open local tunnel device */ | |
1738 | if ((fd = tun_open(local_tun, tun_mode)) == -1) { | |
1739 | error("Tunnel device open failed."); | |
1740 | return -1; | |
1741 | } | |
1742 | ||
1743 | c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1, | |
1744 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1); | |
1745 | c->datagram = 1; | |
1746 | ||
1747 | #if defined(SSH_TUN_FILTER) | |
1748 | if (options.tun_open == SSH_TUNMODE_POINTOPOINT) | |
1749 | channel_register_filter(c->self, sys_tun_infilter, | |
22616013 | 1750 | sys_tun_outfilter, NULL, NULL); |
d4487008 | 1751 | #endif |
1752 | ||
1753 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1754 | packet_put_cstring("tun@openssh.com"); | |
1755 | packet_put_int(c->self); | |
1756 | packet_put_int(c->local_window_max); | |
1757 | packet_put_int(c->local_maxpacket); | |
1758 | packet_put_int(tun_mode); | |
1759 | packet_put_int(remote_tun); | |
1760 | packet_send(); | |
1761 | ||
1762 | return 0; | |
1763 | } | |
1764 | ||
3c0ef626 | 1765 | /* XXXX move to generic input handler */ |
1766 | static void | |
e9a17296 | 1767 | client_input_channel_open(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 1768 | { |
1769 | Channel *c = NULL; | |
1770 | char *ctype; | |
3c0ef626 | 1771 | int rchan; |
680cee3b | 1772 | u_int rmaxpack, rwindow, len; |
3c0ef626 | 1773 | |
1774 | ctype = packet_get_string(&len); | |
1775 | rchan = packet_get_int(); | |
1776 | rwindow = packet_get_int(); | |
1777 | rmaxpack = packet_get_int(); | |
1778 | ||
1779 | debug("client_input_channel_open: ctype %s rchan %d win %d max %d", | |
1780 | ctype, rchan, rwindow, rmaxpack); | |
1781 | ||
1782 | if (strcmp(ctype, "forwarded-tcpip") == 0) { | |
1783 | c = client_request_forwarded_tcpip(ctype, rchan); | |
1784 | } else if (strcmp(ctype, "x11") == 0) { | |
1785 | c = client_request_x11(ctype, rchan); | |
1786 | } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) { | |
1787 | c = client_request_agent(ctype, rchan); | |
1788 | } | |
1789 | /* XXX duplicate : */ | |
1790 | if (c != NULL) { | |
1791 | debug("confirm %s", ctype); | |
1792 | c->remote_id = rchan; | |
1793 | c->remote_window = rwindow; | |
1794 | c->remote_maxpacket = rmaxpack; | |
1795 | if (c->type != SSH_CHANNEL_CONNECTING) { | |
1796 | packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1797 | packet_put_int(c->remote_id); | |
1798 | packet_put_int(c->self); | |
1799 | packet_put_int(c->local_window); | |
1800 | packet_put_int(c->local_maxpacket); | |
1801 | packet_send(); | |
1802 | } | |
1803 | } else { | |
1804 | debug("failure %s", ctype); | |
1805 | packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); | |
1806 | packet_put_int(rchan); | |
1807 | packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED); | |
1808 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { | |
1809 | packet_put_cstring("open failed"); | |
1810 | packet_put_cstring(""); | |
1811 | } | |
1812 | packet_send(); | |
1813 | } | |
1814 | xfree(ctype); | |
1815 | } | |
1816 | static void | |
e9a17296 | 1817 | client_input_channel_req(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 1818 | { |
1819 | Channel *c = NULL; | |
c9f39d2c | 1820 | int exitval, id, reply, success = 0; |
3c0ef626 | 1821 | char *rtype; |
1822 | ||
1823 | id = packet_get_int(); | |
1824 | rtype = packet_get_string(NULL); | |
1825 | reply = packet_get_char(); | |
1826 | ||
1827 | debug("client_input_channel_req: channel %d rtype %s reply %d", | |
1828 | id, rtype, reply); | |
1829 | ||
c9f39d2c | 1830 | if (id == -1) { |
1831 | error("client_input_channel_req: request for channel -1"); | |
1832 | } else if ((c = channel_lookup(id)) == NULL) { | |
22616013 | 1833 | error("client_input_channel_req: channel %d: " |
1834 | "unknown channel", id); | |
1835 | } else if (strcmp(rtype, "eow@openssh.com") == 0) { | |
1836 | packet_check_eom(); | |
1837 | chan_rcvd_eow(c); | |
3c0ef626 | 1838 | } else if (strcmp(rtype, "exit-status") == 0) { |
c9f39d2c | 1839 | exitval = packet_get_int(); |
1840 | if (id == session_ident) { | |
1841 | success = 1; | |
1842 | exit_status = exitval; | |
1843 | } else if (c->ctl_fd == -1) { | |
1844 | error("client_input_channel_req: unexpected channel %d", | |
1845 | session_ident); | |
1846 | } else { | |
1847 | atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval)); | |
1848 | success = 1; | |
1849 | } | |
e9a17296 | 1850 | packet_check_eom(); |
3c0ef626 | 1851 | } |
1852 | if (reply) { | |
1853 | packet_start(success ? | |
1854 | SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE); | |
91d9cdd3 | 1855 | packet_put_int(c->remote_id); |
3c0ef626 | 1856 | packet_send(); |
1857 | } | |
1858 | xfree(rtype); | |
1859 | } | |
e9a17296 | 1860 | static void |
1861 | client_input_global_request(int type, u_int32_t seq, void *ctxt) | |
1862 | { | |
1863 | char *rtype; | |
1864 | int want_reply; | |
1865 | int success = 0; | |
1866 | ||
1867 | rtype = packet_get_string(NULL); | |
1868 | want_reply = packet_get_char(); | |
cdd66111 | 1869 | debug("client_input_global_request: rtype %s want_reply %d", |
1870 | rtype, want_reply); | |
e9a17296 | 1871 | if (want_reply) { |
1872 | packet_start(success ? | |
1873 | SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE); | |
1874 | packet_send(); | |
1875 | packet_write_wait(); | |
1876 | } | |
1877 | xfree(rtype); | |
1878 | } | |
3c0ef626 | 1879 | |
c9f39d2c | 1880 | void |
1881 | client_session2_setup(int id, int want_tty, int want_subsystem, | |
22616013 | 1882 | const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env) |
c9f39d2c | 1883 | { |
1884 | int len; | |
996d5e62 | 1885 | Channel *c = NULL; |
c9f39d2c | 1886 | |
1887 | debug2("%s: id %d", __func__, id); | |
1888 | ||
996d5e62 | 1889 | if ((c = channel_lookup(id)) == NULL) |
1890 | fatal("client_session2_setup: channel %d: unknown channel", id); | |
1891 | ||
c9f39d2c | 1892 | if (want_tty) { |
1893 | struct winsize ws; | |
c9f39d2c | 1894 | |
1895 | /* Store window size in the packet. */ | |
1896 | if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0) | |
1897 | memset(&ws, 0, sizeof(ws)); | |
1898 | ||
22616013 | 1899 | channel_request_start(id, "pty-req", 1); |
1900 | client_expect_confirm(id, "PTY allocation", 0); | |
c9f39d2c | 1901 | packet_put_cstring(term != NULL ? term : ""); |
9108f8d9 | 1902 | packet_put_int((u_int)ws.ws_col); |
1903 | packet_put_int((u_int)ws.ws_row); | |
1904 | packet_put_int((u_int)ws.ws_xpixel); | |
1905 | packet_put_int((u_int)ws.ws_ypixel); | |
22616013 | 1906 | if (tiop == NULL) |
1907 | tiop = get_saved_tio(); | |
1908 | tty_make_modes(-1, tiop); | |
c9f39d2c | 1909 | packet_send(); |
1910 | /* XXX wait for reply */ | |
996d5e62 | 1911 | c->client_tty = 1; |
c9f39d2c | 1912 | } |
1913 | ||
1914 | /* Transfer any environment variables from client to server */ | |
1915 | if (options.num_send_env != 0 && env != NULL) { | |
1916 | int i, j, matched; | |
1917 | char *name, *val; | |
1918 | ||
1919 | debug("Sending environment."); | |
1920 | for (i = 0; env[i] != NULL; i++) { | |
1921 | /* Split */ | |
1922 | name = xstrdup(env[i]); | |
1923 | if ((val = strchr(name, '=')) == NULL) { | |
2c06c99b | 1924 | xfree(name); |
c9f39d2c | 1925 | continue; |
1926 | } | |
1927 | *val++ = '\0'; | |
1928 | ||
1929 | matched = 0; | |
1930 | for (j = 0; j < options.num_send_env; j++) { | |
1931 | if (match_pattern(name, options.send_env[j])) { | |
1932 | matched = 1; | |
1933 | break; | |
1934 | } | |
1935 | } | |
1936 | if (!matched) { | |
1937 | debug3("Ignored env %s", name); | |
2c06c99b | 1938 | xfree(name); |
c9f39d2c | 1939 | continue; |
1940 | } | |
1941 | ||
1942 | debug("Sending env %s = %s", name, val); | |
1943 | channel_request_start(id, "env", 0); | |
1944 | packet_put_cstring(name); | |
1945 | packet_put_cstring(val); | |
1946 | packet_send(); | |
2c06c99b | 1947 | xfree(name); |
c9f39d2c | 1948 | } |
1949 | } | |
1950 | ||
1951 | len = buffer_len(cmd); | |
1952 | if (len > 0) { | |
1953 | if (len > 900) | |
1954 | len = 900; | |
1955 | if (want_subsystem) { | |
22616013 | 1956 | debug("Sending subsystem: %.*s", |
1957 | len, (u_char*)buffer_ptr(cmd)); | |
1958 | channel_request_start(id, "subsystem", 1); | |
1959 | client_expect_confirm(id, "subsystem", 1); | |
c9f39d2c | 1960 | } else { |
22616013 | 1961 | debug("Sending command: %.*s", |
1962 | len, (u_char*)buffer_ptr(cmd)); | |
1963 | channel_request_start(id, "exec", 1); | |
1964 | client_expect_confirm(id, "exec", 1); | |
c9f39d2c | 1965 | } |
1966 | packet_put_string(buffer_ptr(cmd), buffer_len(cmd)); | |
1967 | packet_send(); | |
1968 | } else { | |
22616013 | 1969 | channel_request_start(id, "shell", 1); |
1970 | client_expect_confirm(id, "shell", 1); | |
c9f39d2c | 1971 | packet_send(); |
1972 | } | |
1973 | } | |
1974 | ||
3c0ef626 | 1975 | static void |
1976 | client_init_dispatch_20(void) | |
1977 | { | |
1978 | dispatch_init(&dispatch_protocol_error); | |
700318f3 | 1979 | |
3c0ef626 | 1980 | dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose); |
1981 | dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data); | |
1982 | dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof); | |
1983 | dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data); | |
1984 | dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open); | |
1985 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); | |
1986 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); | |
1987 | dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req); | |
1988 | dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust); | |
22616013 | 1989 | dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm); |
1990 | dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm); | |
e9a17296 | 1991 | dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request); |
3c0ef626 | 1992 | |
1993 | /* rekeying */ | |
1994 | dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit); | |
700318f3 | 1995 | |
1996 | /* global request reply messages */ | |
1997 | dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply); | |
1998 | dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply); | |
3c0ef626 | 1999 | } |
22616013 | 2000 | |
3c0ef626 | 2001 | static void |
2002 | client_init_dispatch_13(void) | |
2003 | { | |
2004 | dispatch_init(NULL); | |
2005 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close); | |
2006 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation); | |
2007 | dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data); | |
2008 | dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); | |
2009 | dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); | |
2010 | dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open); | |
2011 | dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status); | |
2012 | dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data); | |
2013 | dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data); | |
2014 | ||
2015 | dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ? | |
cdd66111 | 2016 | &client_input_agent_open : &deny_input_open); |
3c0ef626 | 2017 | dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ? |
2018 | &x11_input_open : &deny_input_open); | |
2019 | } | |
22616013 | 2020 | |
3c0ef626 | 2021 | static void |
2022 | client_init_dispatch_15(void) | |
2023 | { | |
2024 | client_init_dispatch_13(); | |
2025 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof); | |
2026 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose); | |
2027 | } | |
22616013 | 2028 | |
3c0ef626 | 2029 | static void |
2030 | client_init_dispatch(void) | |
2031 | { | |
2032 | if (compat20) | |
2033 | client_init_dispatch_20(); | |
2034 | else if (compat13) | |
2035 | client_init_dispatch_13(); | |
2036 | else | |
2037 | client_init_dispatch_15(); | |
2038 | } | |
cdd66111 | 2039 | |
2040 | /* client specific fatal cleanup */ | |
2041 | void | |
2042 | cleanup_exit(int i) | |
2043 | { | |
2044 | leave_raw_mode(); | |
2045 | leave_non_blocking(); | |
22616013 | 2046 | if (options.control_path != NULL && muxserver_sock != -1) |
c9f39d2c | 2047 | unlink(options.control_path); |
cdd66111 | 2048 | _exit(i); |
2049 | } |