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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 | |
f97edba6 | 113 | #ifdef GSSAPI |
114 | #include "ssh-gss.h" | |
115 | #endif | |
116 | ||
3c0ef626 | 117 | /* import options */ |
118 | extern Options options; | |
119 | ||
120 | /* Flag indicating that stdin should be redirected from /dev/null. */ | |
121 | extern int stdin_null_flag; | |
122 | ||
cdd66111 | 123 | /* Flag indicating that no shell has been requested */ |
124 | extern int no_shell_flag; | |
125 | ||
c9f39d2c | 126 | /* Control socket */ |
22616013 | 127 | extern int muxserver_sock; |
c9f39d2c | 128 | |
3c0ef626 | 129 | /* |
130 | * Name of the host we are connecting to. This is the name given on the | |
131 | * command line, or the HostName specified for the user-supplied name in a | |
132 | * configuration file. | |
133 | */ | |
134 | extern char *host; | |
135 | ||
136 | /* | |
137 | * Flag to indicate that we have received a window change signal which has | |
138 | * not yet been processed. This will cause a message indicating the new | |
139 | * window size to be sent to the server a little later. This is volatile | |
140 | * because this is updated in a signal handler. | |
141 | */ | |
e9a17296 | 142 | static volatile sig_atomic_t received_window_change_signal = 0; |
143 | static volatile sig_atomic_t received_signal = 0; | |
3c0ef626 | 144 | |
2c06c99b | 145 | /* Flag indicating whether the user's terminal is in non-blocking mode. */ |
3c0ef626 | 146 | static int in_non_blocking_mode = 0; |
147 | ||
148 | /* Common data for the client loop code. */ | |
9108f8d9 | 149 | static volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */ |
22616013 | 150 | static int escape_char1; /* Escape character. (proto1 only) */ |
151 | static int escape_pending1; /* Last character was an escape (proto1 only) */ | |
3c0ef626 | 152 | static int last_was_cr; /* Last character was a newline. */ |
22616013 | 153 | static int exit_status; /* Used to store the command exit status. */ |
154 | static int stdin_eof; /* EOF has been encountered on stderr. */ | |
3c0ef626 | 155 | static Buffer stdin_buffer; /* Buffer for stdin data. */ |
156 | static Buffer stdout_buffer; /* Buffer for stdout data. */ | |
157 | static Buffer stderr_buffer; /* Buffer for stderr data. */ | |
3c0ef626 | 158 | static u_int buffer_high;/* Soft max buffer size. */ |
159 | static int connection_in; /* Connection to server (input). */ | |
160 | static int connection_out; /* Connection to server (output). */ | |
161 | static int need_rekeying; /* Set to non-zero if rekeying is requested. */ | |
162 | static int session_closed = 0; /* In SSH2: login session closed. */ | |
163 | ||
164 | static void client_init_dispatch(void); | |
165 | int session_ident = -1; | |
166 | ||
22616013 | 167 | /* Track escape per proto2 channel */ |
168 | struct escape_filter_ctx { | |
169 | int escape_pending; | |
170 | int escape_char; | |
c9f39d2c | 171 | }; |
172 | ||
22616013 | 173 | /* Context for channel confirmation replies */ |
174 | struct channel_reply_ctx { | |
175 | const char *request_type; | |
176 | int id, do_close; | |
177 | }; | |
178 | ||
179 | /* Global request success/failure callbacks */ | |
180 | struct global_confirm { | |
181 | TAILQ_ENTRY(global_confirm) entry; | |
182 | global_confirm_cb *cb; | |
183 | void *ctx; | |
184 | int ref_count; | |
185 | }; | |
186 | TAILQ_HEAD(global_confirms, global_confirm); | |
187 | static struct global_confirms global_confirms = | |
188 | TAILQ_HEAD_INITIALIZER(global_confirms); | |
189 | ||
3c0ef626 | 190 | /*XXX*/ |
191 | extern Kex *xxx_kex; | |
192 | ||
c9f39d2c | 193 | void ssh_process_session2_setup(int, int, int, Buffer *); |
194 | ||
3c0ef626 | 195 | /* Restores stdin to blocking mode. */ |
196 | ||
197 | static void | |
198 | leave_non_blocking(void) | |
199 | { | |
200 | if (in_non_blocking_mode) { | |
c9f39d2c | 201 | unset_nonblock(fileno(stdin)); |
3c0ef626 | 202 | in_non_blocking_mode = 0; |
3c0ef626 | 203 | } |
204 | } | |
205 | ||
206 | /* Puts stdin terminal in non-blocking mode. */ | |
207 | ||
208 | static void | |
209 | enter_non_blocking(void) | |
210 | { | |
211 | in_non_blocking_mode = 1; | |
c9f39d2c | 212 | set_nonblock(fileno(stdin)); |
3c0ef626 | 213 | } |
214 | ||
215 | /* | |
216 | * Signal handler for the window change signal (SIGWINCH). This just sets a | |
217 | * flag indicating that the window has changed. | |
218 | */ | |
9108f8d9 | 219 | /*ARGSUSED */ |
3c0ef626 | 220 | static void |
221 | window_change_handler(int sig) | |
222 | { | |
223 | received_window_change_signal = 1; | |
224 | signal(SIGWINCH, window_change_handler); | |
225 | } | |
226 | ||
227 | /* | |
228 | * Signal handler for signals that cause the program to terminate. These | |
229 | * signals must be trapped to restore terminal modes. | |
230 | */ | |
9108f8d9 | 231 | /*ARGSUSED */ |
3c0ef626 | 232 | static void |
233 | signal_handler(int sig) | |
234 | { | |
235 | received_signal = sig; | |
236 | quit_pending = 1; | |
237 | } | |
238 | ||
239 | /* | |
240 | * Returns current time in seconds from Jan 1, 1970 with the maximum | |
241 | * available resolution. | |
242 | */ | |
243 | ||
244 | static double | |
245 | get_current_time(void) | |
246 | { | |
247 | struct timeval tv; | |
248 | gettimeofday(&tv, NULL); | |
249 | return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0; | |
250 | } | |
251 | ||
665a873d | 252 | #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1" |
253 | void | |
254 | client_x11_get_proto(const char *display, const char *xauth_path, | |
255 | u_int trusted, char **_proto, char **_data) | |
256 | { | |
257 | char cmd[1024]; | |
258 | char line[512]; | |
259 | char xdisplay[512]; | |
260 | static char proto[512], data[512]; | |
261 | FILE *f; | |
262 | int got_data = 0, generated = 0, do_unlink = 0, i; | |
263 | char *xauthdir, *xauthfile; | |
264 | struct stat st; | |
265 | ||
266 | xauthdir = xauthfile = NULL; | |
267 | *_proto = proto; | |
268 | *_data = data; | |
269 | proto[0] = data[0] = '\0'; | |
270 | ||
271 | if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) { | |
272 | debug("No xauth program."); | |
273 | } else { | |
274 | if (display == NULL) { | |
275 | debug("x11_get_proto: DISPLAY not set"); | |
276 | return; | |
277 | } | |
278 | /* | |
279 | * Handle FamilyLocal case where $DISPLAY does | |
280 | * not match an authorization entry. For this we | |
281 | * just try "xauth list unix:displaynum.screennum". | |
282 | * XXX: "localhost" match to determine FamilyLocal | |
283 | * is not perfect. | |
284 | */ | |
285 | if (strncmp(display, "localhost:", 10) == 0) { | |
286 | snprintf(xdisplay, sizeof(xdisplay), "unix:%s", | |
287 | display + 10); | |
288 | display = xdisplay; | |
289 | } | |
290 | if (trusted == 0) { | |
291 | xauthdir = xmalloc(MAXPATHLEN); | |
292 | xauthfile = xmalloc(MAXPATHLEN); | |
293 | strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN); | |
294 | if (mkdtemp(xauthdir) != NULL) { | |
295 | do_unlink = 1; | |
296 | snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile", | |
297 | xauthdir); | |
298 | snprintf(cmd, sizeof(cmd), | |
299 | "%s -f %s generate %s " SSH_X11_PROTO | |
300 | " untrusted timeout 1200 2>" _PATH_DEVNULL, | |
301 | xauth_path, xauthfile, display); | |
302 | debug2("x11_get_proto: %s", cmd); | |
303 | if (system(cmd) == 0) | |
304 | generated = 1; | |
305 | } | |
306 | } | |
d4487008 | 307 | |
308 | /* | |
309 | * When in untrusted mode, we read the cookie only if it was | |
310 | * successfully generated as an untrusted one in the step | |
311 | * above. | |
312 | */ | |
313 | if (trusted || generated) { | |
314 | snprintf(cmd, sizeof(cmd), | |
315 | "%s %s%s list %s 2>" _PATH_DEVNULL, | |
316 | xauth_path, | |
317 | generated ? "-f " : "" , | |
318 | generated ? xauthfile : "", | |
319 | display); | |
320 | debug2("x11_get_proto: %s", cmd); | |
321 | f = popen(cmd, "r"); | |
322 | if (f && fgets(line, sizeof(line), f) && | |
323 | sscanf(line, "%*s %511s %511s", proto, data) == 2) | |
324 | got_data = 1; | |
325 | if (f) | |
326 | pclose(f); | |
327 | } else | |
328 | error("Warning: untrusted X11 forwarding setup failed: " | |
329 | "xauth key data not generated"); | |
665a873d | 330 | } |
331 | ||
332 | if (do_unlink) { | |
333 | unlink(xauthfile); | |
334 | rmdir(xauthdir); | |
335 | } | |
336 | if (xauthdir) | |
337 | xfree(xauthdir); | |
338 | if (xauthfile) | |
339 | xfree(xauthfile); | |
340 | ||
341 | /* | |
342 | * If we didn't get authentication data, just make up some | |
343 | * data. The forwarding code will check the validity of the | |
344 | * response anyway, and substitute this data. The X11 | |
345 | * server, however, will ignore this fake data and use | |
346 | * whatever authentication mechanisms it was using otherwise | |
347 | * for the local connection. | |
348 | */ | |
349 | if (!got_data) { | |
350 | u_int32_t rnd = 0; | |
351 | ||
352 | logit("Warning: No xauth data; " | |
353 | "using fake authentication data for X11 forwarding."); | |
354 | strlcpy(proto, SSH_X11_PROTO, sizeof proto); | |
355 | for (i = 0; i < 16; i++) { | |
356 | if (i % 4 == 0) | |
357 | rnd = arc4random(); | |
358 | snprintf(data + 2 * i, sizeof data - 2 * i, "%02x", | |
359 | rnd & 0xff); | |
360 | rnd >>= 8; | |
361 | } | |
362 | } | |
363 | } | |
364 | ||
3c0ef626 | 365 | /* |
366 | * This is called when the interactive is entered. This checks if there is | |
367 | * an EOF coming on stdin. We must check this explicitly, as select() does | |
368 | * not appear to wake up when redirecting from /dev/null. | |
369 | */ | |
370 | ||
371 | static void | |
372 | client_check_initial_eof_on_stdin(void) | |
373 | { | |
374 | int len; | |
375 | char buf[1]; | |
376 | ||
377 | /* | |
378 | * If standard input is to be "redirected from /dev/null", we simply | |
379 | * mark that we have seen an EOF and send an EOF message to the | |
380 | * server. Otherwise, we try to read a single character; it appears | |
381 | * that for some files, such /dev/null, select() never wakes up for | |
382 | * read for this descriptor, which means that we never get EOF. This | |
383 | * way we will get the EOF if stdin comes from /dev/null or similar. | |
384 | */ | |
385 | if (stdin_null_flag) { | |
386 | /* Fake EOF on stdin. */ | |
387 | debug("Sending eof."); | |
388 | stdin_eof = 1; | |
389 | packet_start(SSH_CMSG_EOF); | |
390 | packet_send(); | |
391 | } else { | |
392 | enter_non_blocking(); | |
393 | ||
394 | /* Check for immediate EOF on stdin. */ | |
395 | len = read(fileno(stdin), buf, 1); | |
396 | if (len == 0) { | |
22616013 | 397 | /* |
398 | * EOF. Record that we have seen it and send | |
399 | * EOF to server. | |
400 | */ | |
3c0ef626 | 401 | debug("Sending eof."); |
402 | stdin_eof = 1; | |
403 | packet_start(SSH_CMSG_EOF); | |
404 | packet_send(); | |
405 | } else if (len > 0) { | |
406 | /* | |
407 | * Got data. We must store the data in the buffer, | |
408 | * and also process it as an escape character if | |
409 | * appropriate. | |
410 | */ | |
22616013 | 411 | if ((u_char) buf[0] == escape_char1) |
412 | escape_pending1 = 1; | |
3c0ef626 | 413 | else |
414 | buffer_append(&stdin_buffer, buf, 1); | |
415 | } | |
416 | leave_non_blocking(); | |
417 | } | |
418 | } | |
419 | ||
420 | ||
421 | /* | |
422 | * Make packets from buffered stdin data, and buffer them for sending to the | |
423 | * connection. | |
424 | */ | |
425 | ||
426 | static void | |
427 | client_make_packets_from_stdin_data(void) | |
428 | { | |
429 | u_int len; | |
430 | ||
431 | /* Send buffered stdin data to the server. */ | |
432 | while (buffer_len(&stdin_buffer) > 0 && | |
e9a17296 | 433 | packet_not_very_much_data_to_write()) { |
3c0ef626 | 434 | len = buffer_len(&stdin_buffer); |
435 | /* Keep the packets at reasonable size. */ | |
436 | if (len > packet_get_maxsize()) | |
437 | len = packet_get_maxsize(); | |
438 | packet_start(SSH_CMSG_STDIN_DATA); | |
439 | packet_put_string(buffer_ptr(&stdin_buffer), len); | |
440 | packet_send(); | |
441 | buffer_consume(&stdin_buffer, len); | |
3c0ef626 | 442 | /* If we have a pending EOF, send it now. */ |
443 | if (stdin_eof && buffer_len(&stdin_buffer) == 0) { | |
444 | packet_start(SSH_CMSG_EOF); | |
445 | packet_send(); | |
446 | } | |
447 | } | |
448 | } | |
449 | ||
450 | /* | |
451 | * Checks if the client window has changed, and sends a packet about it to | |
452 | * the server if so. The actual change is detected elsewhere (by a software | |
453 | * interrupt on Unix); this just checks the flag and sends a message if | |
454 | * appropriate. | |
455 | */ | |
456 | ||
457 | static void | |
458 | client_check_window_change(void) | |
459 | { | |
460 | struct winsize ws; | |
461 | ||
462 | if (! received_window_change_signal) | |
463 | return; | |
464 | /** XXX race */ | |
465 | received_window_change_signal = 0; | |
466 | ||
3c0ef626 | 467 | debug2("client_check_window_change: changed"); |
468 | ||
469 | if (compat20) { | |
c9f39d2c | 470 | channel_send_window_changes(); |
3c0ef626 | 471 | } else { |
c9f39d2c | 472 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) |
473 | return; | |
3c0ef626 | 474 | packet_start(SSH_CMSG_WINDOW_SIZE); |
9108f8d9 | 475 | packet_put_int((u_int)ws.ws_row); |
476 | packet_put_int((u_int)ws.ws_col); | |
477 | packet_put_int((u_int)ws.ws_xpixel); | |
478 | packet_put_int((u_int)ws.ws_ypixel); | |
3c0ef626 | 479 | packet_send(); |
480 | } | |
481 | } | |
482 | ||
cdd66111 | 483 | static void |
484 | client_global_request_reply(int type, u_int32_t seq, void *ctxt) | |
485 | { | |
22616013 | 486 | struct global_confirm *gc; |
487 | ||
488 | if ((gc = TAILQ_FIRST(&global_confirms)) == NULL) | |
489 | return; | |
490 | if (gc->cb != NULL) | |
491 | gc->cb(type, seq, gc->ctx); | |
492 | if (--gc->ref_count <= 0) { | |
493 | TAILQ_REMOVE(&global_confirms, gc, entry); | |
494 | bzero(gc, sizeof(*gc)); | |
495 | xfree(gc); | |
496 | } | |
497 | ||
47686178 | 498 | keep_alive_timeouts = 0; |
cdd66111 | 499 | } |
500 | ||
501 | static void | |
502 | server_alive_check(void) | |
503 | { | |
47686178 | 504 | if (++keep_alive_timeouts > options.server_alive_count_max) { |
ff7ec503 | 505 | logit("Timeout, server not responding."); |
506 | cleanup_exit(255); | |
507 | } | |
cdd66111 | 508 | packet_start(SSH2_MSG_GLOBAL_REQUEST); |
509 | packet_put_cstring("keepalive@openssh.com"); | |
510 | packet_put_char(1); /* boolean: want reply */ | |
511 | packet_send(); | |
22616013 | 512 | /* Insert an empty placeholder to maintain ordering */ |
513 | client_register_global_confirm(NULL, NULL); | |
cdd66111 | 514 | } |
515 | ||
3c0ef626 | 516 | /* |
517 | * Waits until the client can do something (some data becomes available on | |
518 | * one of the file descriptors). | |
519 | */ | |
3c0ef626 | 520 | static void |
521 | client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp, | |
c9f39d2c | 522 | int *maxfdp, u_int *nallocp, int rekeying) |
3c0ef626 | 523 | { |
cdd66111 | 524 | struct timeval tv, *tvp; |
525 | int ret; | |
526 | ||
3c0ef626 | 527 | /* Add any selections by the channel mechanism. */ |
528 | channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying); | |
529 | ||
530 | if (!compat20) { | |
531 | /* Read from the connection, unless our buffers are full. */ | |
532 | if (buffer_len(&stdout_buffer) < buffer_high && | |
533 | buffer_len(&stderr_buffer) < buffer_high && | |
534 | channel_not_very_much_buffered_data()) | |
535 | FD_SET(connection_in, *readsetp); | |
536 | /* | |
537 | * Read from stdin, unless we have seen EOF or have very much | |
538 | * buffered data to send to the server. | |
539 | */ | |
540 | if (!stdin_eof && packet_not_very_much_data_to_write()) | |
541 | FD_SET(fileno(stdin), *readsetp); | |
542 | ||
543 | /* Select stdout/stderr if have data in buffer. */ | |
544 | if (buffer_len(&stdout_buffer) > 0) | |
545 | FD_SET(fileno(stdout), *writesetp); | |
546 | if (buffer_len(&stderr_buffer) > 0) | |
547 | FD_SET(fileno(stderr), *writesetp); | |
548 | } else { | |
549 | /* channel_prepare_select could have closed the last channel */ | |
550 | if (session_closed && !channel_still_open() && | |
551 | !packet_have_data_to_write()) { | |
552 | /* clear mask since we did not call select() */ | |
553 | memset(*readsetp, 0, *nallocp); | |
554 | memset(*writesetp, 0, *nallocp); | |
555 | return; | |
556 | } else { | |
557 | FD_SET(connection_in, *readsetp); | |
558 | } | |
559 | } | |
560 | ||
561 | /* Select server connection if have data to write to the server. */ | |
562 | if (packet_have_data_to_write()) | |
563 | FD_SET(connection_out, *writesetp); | |
564 | ||
22616013 | 565 | if (muxserver_sock != -1) |
566 | FD_SET(muxserver_sock, *readsetp); | |
c9f39d2c | 567 | |
3c0ef626 | 568 | /* |
569 | * Wait for something to happen. This will suspend the process until | |
570 | * some selected descriptor can be read, written, or has some other | |
cdd66111 | 571 | * event pending. |
3c0ef626 | 572 | */ |
573 | ||
cdd66111 | 574 | if (options.server_alive_interval == 0 || !compat20) |
575 | tvp = NULL; | |
c9f39d2c | 576 | else { |
cdd66111 | 577 | tv.tv_sec = options.server_alive_interval; |
578 | tv.tv_usec = 0; | |
579 | tvp = &tv; | |
580 | } | |
581 | ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp); | |
582 | if (ret < 0) { | |
3c0ef626 | 583 | char buf[100]; |
584 | ||
585 | /* | |
586 | * We have to clear the select masks, because we return. | |
587 | * We have to return, because the mainloop checks for the flags | |
588 | * set by the signal handlers. | |
589 | */ | |
590 | memset(*readsetp, 0, *nallocp); | |
591 | memset(*writesetp, 0, *nallocp); | |
592 | ||
593 | if (errno == EINTR) | |
594 | return; | |
595 | /* Note: we might still have data in the buffers. */ | |
596 | snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno)); | |
597 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
598 | quit_pending = 1; | |
cdd66111 | 599 | } else if (ret == 0) |
600 | server_alive_check(); | |
3c0ef626 | 601 | } |
602 | ||
603 | static void | |
604 | client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr) | |
605 | { | |
3c0ef626 | 606 | /* Flush stdout and stderr buffers. */ |
607 | if (buffer_len(bout) > 0) | |
22616013 | 608 | atomicio(vwrite, fileno(stdout), buffer_ptr(bout), |
609 | buffer_len(bout)); | |
3c0ef626 | 610 | if (buffer_len(berr) > 0) |
22616013 | 611 | atomicio(vwrite, fileno(stderr), buffer_ptr(berr), |
612 | buffer_len(berr)); | |
3c0ef626 | 613 | |
614 | leave_raw_mode(); | |
615 | ||
616 | /* | |
617 | * Free (and clear) the buffer to reduce the amount of data that gets | |
618 | * written to swap. | |
619 | */ | |
620 | buffer_free(bin); | |
621 | buffer_free(bout); | |
622 | buffer_free(berr); | |
623 | ||
3c0ef626 | 624 | /* Send the suspend signal to the program itself. */ |
625 | kill(getpid(), SIGTSTP); | |
626 | ||
996d5e62 | 627 | /* Reset window sizes in case they have changed */ |
628 | received_window_change_signal = 1; | |
3c0ef626 | 629 | |
630 | /* OK, we have been continued by the user. Reinitialize buffers. */ | |
631 | buffer_init(bin); | |
632 | buffer_init(bout); | |
633 | buffer_init(berr); | |
634 | ||
635 | enter_raw_mode(); | |
636 | } | |
637 | ||
638 | static void | |
9108f8d9 | 639 | client_process_net_input(fd_set *readset) |
3c0ef626 | 640 | { |
641 | int len; | |
642 | char buf[8192]; | |
643 | ||
644 | /* | |
645 | * Read input from the server, and add any such data to the buffer of | |
646 | * the packet subsystem. | |
647 | */ | |
648 | if (FD_ISSET(connection_in, readset)) { | |
649 | /* Read as much as possible. */ | |
650 | len = read(connection_in, buf, sizeof(buf)); | |
651 | if (len == 0) { | |
22616013 | 652 | /* |
653 | * Received EOF. The remote host has closed the | |
654 | * connection. | |
655 | */ | |
656 | snprintf(buf, sizeof buf, | |
657 | "Connection to %.300s closed by remote host.\r\n", | |
658 | host); | |
3c0ef626 | 659 | buffer_append(&stderr_buffer, buf, strlen(buf)); |
660 | quit_pending = 1; | |
661 | return; | |
662 | } | |
663 | /* | |
664 | * There is a kernel bug on Solaris that causes select to | |
665 | * sometimes wake up even though there is no data available. | |
666 | */ | |
22616013 | 667 | if (len < 0 && |
668 | (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK)) | |
3c0ef626 | 669 | len = 0; |
670 | ||
671 | if (len < 0) { | |
22616013 | 672 | /* |
673 | * An error has encountered. Perhaps there is a | |
674 | * network problem. | |
675 | */ | |
676 | snprintf(buf, sizeof buf, | |
677 | "Read from remote host %.300s: %.100s\r\n", | |
678 | host, strerror(errno)); | |
3c0ef626 | 679 | buffer_append(&stderr_buffer, buf, strlen(buf)); |
680 | quit_pending = 1; | |
681 | return; | |
682 | } | |
683 | packet_process_incoming(buf, len); | |
684 | } | |
685 | } | |
686 | ||
c9f39d2c | 687 | static void |
22616013 | 688 | client_status_confirm(int type, Channel *c, void *ctx) |
c9f39d2c | 689 | { |
22616013 | 690 | struct channel_reply_ctx *cr = (struct channel_reply_ctx *)ctx; |
691 | char errmsg[256]; | |
692 | int tochan; | |
693 | ||
694 | /* XXX supress on mux _client_ quietmode */ | |
695 | tochan = options.log_level >= SYSLOG_LEVEL_ERROR && | |
696 | c->ctl_fd != -1 && c->extended_usage == CHAN_EXTENDED_WRITE; | |
697 | ||
698 | if (type == SSH2_MSG_CHANNEL_SUCCESS) { | |
699 | debug2("%s request accepted on channel %d", | |
700 | cr->request_type, c->self); | |
701 | } else if (type == SSH2_MSG_CHANNEL_FAILURE) { | |
702 | if (tochan) { | |
703 | snprintf(errmsg, sizeof(errmsg), | |
704 | "%s request failed\r\n", cr->request_type); | |
705 | } else { | |
706 | snprintf(errmsg, sizeof(errmsg), | |
707 | "%s request failed on channel %d", | |
708 | cr->request_type, c->self); | |
709 | } | |
710 | /* If error occurred on primary session channel, then exit */ | |
711 | if (cr->do_close && c->self == session_ident) | |
712 | fatal("%s", errmsg); | |
713 | /* If error occurred on mux client, append to their stderr */ | |
714 | if (tochan) | |
715 | buffer_append(&c->extended, errmsg, strlen(errmsg)); | |
716 | else | |
717 | error("%s", errmsg); | |
718 | if (cr->do_close) { | |
719 | chan_read_failed(c); | |
720 | chan_write_failed(c); | |
721 | } | |
c9f39d2c | 722 | } |
22616013 | 723 | xfree(cr); |
c9f39d2c | 724 | } |
725 | ||
726 | static void | |
22616013 | 727 | client_abandon_status_confirm(Channel *c, void *ctx) |
c9f39d2c | 728 | { |
22616013 | 729 | xfree(ctx); |
c9f39d2c | 730 | } |
731 | ||
732 | static void | |
22616013 | 733 | client_expect_confirm(int id, const char *request, int do_close) |
c9f39d2c | 734 | { |
22616013 | 735 | struct channel_reply_ctx *cr = xmalloc(sizeof(*cr)); |
c9f39d2c | 736 | |
22616013 | 737 | cr->request_type = request; |
738 | cr->do_close = do_close; | |
c9f39d2c | 739 | |
22616013 | 740 | channel_register_status_confirm(id, client_status_confirm, |
741 | client_abandon_status_confirm, cr); | |
742 | } | |
c9f39d2c | 743 | |
22616013 | 744 | void |
745 | client_register_global_confirm(global_confirm_cb *cb, void *ctx) | |
746 | { | |
747 | struct global_confirm *gc, *last_gc; | |
748 | ||
749 | /* Coalesce identical callbacks */ | |
750 | last_gc = TAILQ_LAST(&global_confirms, global_confirms); | |
751 | if (last_gc && last_gc->cb == cb && last_gc->ctx == ctx) { | |
752 | if (++last_gc->ref_count >= INT_MAX) | |
753 | fatal("%s: last_gc->ref_count = %d", | |
754 | __func__, last_gc->ref_count); | |
c9f39d2c | 755 | return; |
756 | } | |
c9f39d2c | 757 | |
22616013 | 758 | gc = xmalloc(sizeof(*gc)); |
759 | gc->cb = cb; | |
760 | gc->ctx = ctx; | |
761 | gc->ref_count = 1; | |
762 | TAILQ_INSERT_TAIL(&global_confirms, gc, entry); | |
c9f39d2c | 763 | } |
764 | ||
700318f3 | 765 | static void |
766 | process_cmdline(void) | |
767 | { | |
768 | void (*handler)(int); | |
996d5e62 | 769 | char *s, *cmd, *cancel_host; |
c9f39d2c | 770 | int delete = 0; |
91d9cdd3 | 771 | int local = 0, remote = 0, dynamic = 0; |
772 | int cancel_port; | |
996d5e62 | 773 | Forward fwd; |
700318f3 | 774 | |
47686178 | 775 | bzero(&fwd, sizeof(fwd)); |
776 | fwd.listen_host = fwd.connect_host = NULL; | |
777 | ||
700318f3 | 778 | leave_raw_mode(); |
f5799ae1 | 779 | handler = signal(SIGINT, SIG_IGN); |
700318f3 | 780 | cmd = s = read_passphrase("\r\nssh> ", RP_ECHO); |
781 | if (s == NULL) | |
782 | goto out; | |
d4487008 | 783 | while (isspace(*s)) |
700318f3 | 784 | s++; |
c9f39d2c | 785 | if (*s == '-') |
786 | s++; /* Skip cmdline '-', if any */ | |
787 | if (*s == '\0') | |
788 | goto out; | |
789 | ||
790 | if (*s == 'h' || *s == 'H' || *s == '?') { | |
791 | logit("Commands:"); | |
9108f8d9 | 792 | logit(" -L[bind_address:]port:host:hostport " |
793 | "Request local forward"); | |
794 | logit(" -R[bind_address:]port:host:hostport " | |
795 | "Request remote forward"); | |
91d9cdd3 | 796 | logit(" -D[bind_address:]port " |
797 | "Request dynamic forward"); | |
9108f8d9 | 798 | logit(" -KR[bind_address:]port " |
799 | "Cancel remote forward"); | |
2c06c99b | 800 | if (!options.permit_local_command) |
801 | goto out; | |
9108f8d9 | 802 | logit(" !args " |
803 | "Execute local command"); | |
2c06c99b | 804 | goto out; |
805 | } | |
806 | ||
807 | if (*s == '!' && options.permit_local_command) { | |
808 | s++; | |
809 | ssh_local_cmd(s); | |
700318f3 | 810 | goto out; |
c9f39d2c | 811 | } |
812 | ||
813 | if (*s == 'K') { | |
814 | delete = 1; | |
815 | s++; | |
816 | } | |
91d9cdd3 | 817 | if (*s == 'L') |
818 | local = 1; | |
819 | else if (*s == 'R') | |
820 | remote = 1; | |
821 | else if (*s == 'D') | |
822 | dynamic = 1; | |
823 | else { | |
0fff78ff | 824 | logit("Invalid command."); |
700318f3 | 825 | goto out; |
826 | } | |
91d9cdd3 | 827 | |
828 | if ((local || dynamic) && delete) { | |
c9f39d2c | 829 | logit("Not supported."); |
830 | goto out; | |
831 | } | |
91d9cdd3 | 832 | if (remote && delete && !compat20) { |
0fff78ff | 833 | logit("Not supported for SSH protocol version 1."); |
700318f3 | 834 | goto out; |
835 | } | |
c9f39d2c | 836 | |
d4487008 | 837 | while (isspace(*++s)) |
838 | ; | |
700318f3 | 839 | |
c9f39d2c | 840 | if (delete) { |
996d5e62 | 841 | cancel_port = 0; |
842 | cancel_host = hpdelim(&s); /* may be NULL */ | |
843 | if (s != NULL) { | |
844 | cancel_port = a2port(s); | |
845 | cancel_host = cleanhostname(cancel_host); | |
846 | } else { | |
847 | cancel_port = a2port(cancel_host); | |
848 | cancel_host = NULL; | |
c9f39d2c | 849 | } |
91d9cdd3 | 850 | if (cancel_port <= 0) { |
996d5e62 | 851 | logit("Bad forwarding close port"); |
c9f39d2c | 852 | goto out; |
853 | } | |
996d5e62 | 854 | channel_request_rforward_cancel(cancel_host, cancel_port); |
c9f39d2c | 855 | } else { |
91d9cdd3 | 856 | if (!parse_forward(&fwd, s, dynamic, remote)) { |
c9f39d2c | 857 | logit("Bad forwarding specification."); |
858 | goto out; | |
859 | } | |
91d9cdd3 | 860 | if (local || dynamic) { |
996d5e62 | 861 | if (channel_setup_local_fwd_listener(fwd.listen_host, |
862 | fwd.listen_port, fwd.connect_host, | |
863 | fwd.connect_port, options.gateway_ports) < 0) { | |
c9f39d2c | 864 | logit("Port forwarding failed."); |
865 | goto out; | |
866 | } | |
996d5e62 | 867 | } else { |
9108f8d9 | 868 | if (channel_request_remote_forwarding(fwd.listen_host, |
996d5e62 | 869 | fwd.listen_port, fwd.connect_host, |
9108f8d9 | 870 | fwd.connect_port) < 0) { |
871 | logit("Port forwarding failed."); | |
872 | goto out; | |
873 | } | |
996d5e62 | 874 | } |
875 | ||
c9f39d2c | 876 | logit("Forwarding port."); |
877 | } | |
878 | ||
700318f3 | 879 | out: |
880 | signal(SIGINT, handler); | |
881 | enter_raw_mode(); | |
882 | if (cmd) | |
883 | xfree(cmd); | |
47686178 | 884 | if (fwd.listen_host != NULL) |
885 | xfree(fwd.listen_host); | |
886 | if (fwd.connect_host != NULL) | |
887 | xfree(fwd.connect_host); | |
700318f3 | 888 | } |
889 | ||
22616013 | 890 | /* |
891 | * Process the characters one by one, call with c==NULL for proto1 case. | |
892 | */ | |
3c0ef626 | 893 | static int |
22616013 | 894 | process_escapes(Channel *c, Buffer *bin, Buffer *bout, Buffer *berr, |
895 | char *buf, int len) | |
3c0ef626 | 896 | { |
897 | char string[1024]; | |
898 | pid_t pid; | |
899 | int bytes = 0; | |
900 | u_int i; | |
901 | u_char ch; | |
902 | char *s; | |
22616013 | 903 | int *escape_pendingp, escape_char; |
904 | struct escape_filter_ctx *efc; | |
3c0ef626 | 905 | |
22616013 | 906 | if (c == NULL) { |
907 | escape_pendingp = &escape_pending1; | |
908 | escape_char = escape_char1; | |
909 | } else { | |
910 | if (c->filter_ctx == NULL) | |
911 | return 0; | |
912 | efc = (struct escape_filter_ctx *)c->filter_ctx; | |
913 | escape_pendingp = &efc->escape_pending; | |
914 | escape_char = efc->escape_char; | |
915 | } | |
916 | ||
665a873d | 917 | if (len <= 0) |
918 | return (0); | |
919 | ||
920 | for (i = 0; i < (u_int)len; i++) { | |
3c0ef626 | 921 | /* Get one character at a time. */ |
922 | ch = buf[i]; | |
923 | ||
22616013 | 924 | if (*escape_pendingp) { |
3c0ef626 | 925 | /* We have previously seen an escape character. */ |
926 | /* Clear the flag now. */ | |
22616013 | 927 | *escape_pendingp = 0; |
3c0ef626 | 928 | |
929 | /* Process the escaped character. */ | |
930 | switch (ch) { | |
931 | case '.': | |
932 | /* Terminate the connection. */ | |
22616013 | 933 | snprintf(string, sizeof string, "%c.\r\n", |
934 | escape_char); | |
3c0ef626 | 935 | buffer_append(berr, string, strlen(string)); |
936 | ||
22616013 | 937 | if (c && c->ctl_fd != -1) { |
938 | chan_read_failed(c); | |
939 | chan_write_failed(c); | |
940 | return 0; | |
941 | } else | |
942 | quit_pending = 1; | |
3c0ef626 | 943 | return -1; |
944 | ||
945 | case 'Z' - 64: | |
22616013 | 946 | /* XXX support this for mux clients */ |
947 | if (c && c->ctl_fd != -1) { | |
948 | noescape: | |
949 | snprintf(string, sizeof string, | |
950 | "%c%c escape not available to " | |
951 | "multiplexed sessions\r\n", | |
952 | escape_char, ch); | |
953 | buffer_append(berr, string, | |
954 | strlen(string)); | |
955 | continue; | |
956 | } | |
957 | /* Suspend the program. Inform the user */ | |
958 | snprintf(string, sizeof string, | |
959 | "%c^Z [suspend ssh]\r\n", escape_char); | |
3c0ef626 | 960 | buffer_append(berr, string, strlen(string)); |
961 | ||
962 | /* Restore terminal modes and suspend. */ | |
963 | client_suspend_self(bin, bout, berr); | |
964 | ||
965 | /* We have been continued. */ | |
966 | continue; | |
967 | ||
0fff78ff | 968 | case 'B': |
969 | if (compat20) { | |
970 | snprintf(string, sizeof string, | |
971 | "%cB\r\n", escape_char); | |
972 | buffer_append(berr, string, | |
973 | strlen(string)); | |
974 | channel_request_start(session_ident, | |
975 | "break", 0); | |
976 | packet_put_int(1000); | |
977 | packet_send(); | |
978 | } | |
979 | continue; | |
980 | ||
3c0ef626 | 981 | case 'R': |
982 | if (compat20) { | |
983 | if (datafellows & SSH_BUG_NOREKEY) | |
22616013 | 984 | logit("Server does not " |
985 | "support re-keying"); | |
3c0ef626 | 986 | else |
987 | need_rekeying = 1; | |
988 | } | |
989 | continue; | |
990 | ||
991 | case '&': | |
22616013 | 992 | if (c && c->ctl_fd != -1) |
993 | goto noescape; | |
3c0ef626 | 994 | /* |
22616013 | 995 | * Detach the program (continue to serve |
996 | * connections, but put in background and no | |
997 | * more new connections). | |
3c0ef626 | 998 | */ |
999 | /* Restore tty modes. */ | |
1000 | leave_raw_mode(); | |
1001 | ||
1002 | /* Stop listening for new connections. */ | |
1003 | channel_stop_listening(); | |
1004 | ||
1005 | snprintf(string, sizeof string, | |
1006 | "%c& [backgrounded]\n", escape_char); | |
1007 | buffer_append(berr, string, strlen(string)); | |
1008 | ||
1009 | /* Fork into background. */ | |
1010 | pid = fork(); | |
1011 | if (pid < 0) { | |
1012 | error("fork: %.100s", strerror(errno)); | |
1013 | continue; | |
1014 | } | |
1015 | if (pid != 0) { /* This is the parent. */ | |
1016 | /* The parent just exits. */ | |
1017 | exit(0); | |
1018 | } | |
1019 | /* The child continues serving connections. */ | |
1020 | if (compat20) { | |
1021 | buffer_append(bin, "\004", 1); | |
1022 | /* fake EOF on stdin */ | |
1023 | return -1; | |
1024 | } else if (!stdin_eof) { | |
1025 | /* | |
22616013 | 1026 | * Sending SSH_CMSG_EOF alone does not |
1027 | * always appear to be enough. So we | |
1028 | * try to send an EOF character first. | |
3c0ef626 | 1029 | */ |
1030 | packet_start(SSH_CMSG_STDIN_DATA); | |
1031 | packet_put_string("\004", 1); | |
1032 | packet_send(); | |
1033 | /* Close stdin. */ | |
1034 | stdin_eof = 1; | |
1035 | if (buffer_len(bin) == 0) { | |
1036 | packet_start(SSH_CMSG_EOF); | |
1037 | packet_send(); | |
1038 | } | |
1039 | } | |
1040 | continue; | |
1041 | ||
1042 | case '?': | |
22616013 | 1043 | if (c && c->ctl_fd != -1) { |
1044 | snprintf(string, sizeof string, | |
1045 | "%c?\r\n\ | |
1046 | Supported escape sequences:\r\n\ | |
1047 | %c. - terminate session\r\n\ | |
1048 | %cB - send a BREAK to the remote system\r\n\ | |
22616013 | 1049 | %cR - Request rekey (SSH protocol 2 only)\r\n\ |
1050 | %c# - list forwarded connections\r\n\ | |
1051 | %c? - this message\r\n\ | |
1052 | %c%c - send the escape character by typing it twice\r\n\ | |
1053 | (Note that escapes are only recognized immediately after newline.)\r\n", | |
1054 | escape_char, escape_char, | |
1055 | escape_char, escape_char, | |
1056 | escape_char, escape_char, | |
91d9cdd3 | 1057 | escape_char, escape_char); |
22616013 | 1058 | } else { |
1059 | snprintf(string, sizeof string, | |
3c0ef626 | 1060 | "%c?\r\n\ |
1061 | Supported escape sequences:\r\n\ | |
22616013 | 1062 | %c. - terminate connection (and any multiplexed sessions)\r\n\ |
1063 | %cB - send a BREAK to the remote system\r\n\ | |
1064 | %cC - open a command line\r\n\ | |
1065 | %cR - Request rekey (SSH protocol 2 only)\r\n\ | |
1066 | %c^Z - suspend ssh\r\n\ | |
1067 | %c# - list forwarded connections\r\n\ | |
1068 | %c& - background ssh (when waiting for connections to terminate)\r\n\ | |
1069 | %c? - this message\r\n\ | |
1070 | %c%c - send the escape character by typing it twice\r\n\ | |
3c0ef626 | 1071 | (Note that escapes are only recognized immediately after newline.)\r\n", |
22616013 | 1072 | escape_char, escape_char, |
1073 | escape_char, escape_char, | |
1074 | escape_char, escape_char, | |
1075 | escape_char, escape_char, | |
1076 | escape_char, escape_char, | |
1077 | escape_char); | |
1078 | } | |
3c0ef626 | 1079 | buffer_append(berr, string, strlen(string)); |
1080 | continue; | |
1081 | ||
1082 | case '#': | |
22616013 | 1083 | snprintf(string, sizeof string, "%c#\r\n", |
1084 | escape_char); | |
3c0ef626 | 1085 | buffer_append(berr, string, strlen(string)); |
1086 | s = channel_open_message(); | |
1087 | buffer_append(berr, s, strlen(s)); | |
1088 | xfree(s); | |
1089 | continue; | |
1090 | ||
700318f3 | 1091 | case 'C': |
91d9cdd3 | 1092 | if (c && c->ctl_fd != -1) |
1093 | goto noescape; | |
700318f3 | 1094 | process_cmdline(); |
1095 | continue; | |
1096 | ||
3c0ef626 | 1097 | default: |
1098 | if (ch != escape_char) { | |
1099 | buffer_put_char(bin, escape_char); | |
1100 | bytes++; | |
1101 | } | |
1102 | /* Escaped characters fall through here */ | |
1103 | break; | |
1104 | } | |
1105 | } else { | |
1106 | /* | |
22616013 | 1107 | * The previous character was not an escape char. |
1108 | * Check if this is an escape. | |
3c0ef626 | 1109 | */ |
1110 | if (last_was_cr && ch == escape_char) { | |
22616013 | 1111 | /* |
1112 | * It is. Set the flag and continue to | |
1113 | * next character. | |
1114 | */ | |
1115 | *escape_pendingp = 1; | |
3c0ef626 | 1116 | continue; |
1117 | } | |
1118 | } | |
1119 | ||
1120 | /* | |
1121 | * Normal character. Record whether it was a newline, | |
1122 | * and append it to the buffer. | |
1123 | */ | |
1124 | last_was_cr = (ch == '\r' || ch == '\n'); | |
1125 | buffer_put_char(bin, ch); | |
1126 | bytes++; | |
1127 | } | |
1128 | return bytes; | |
1129 | } | |
1130 | ||
1131 | static void | |
9108f8d9 | 1132 | client_process_input(fd_set *readset) |
3c0ef626 | 1133 | { |
1134 | int len; | |
1135 | char buf[8192]; | |
1136 | ||
1137 | /* Read input from stdin. */ | |
1138 | if (FD_ISSET(fileno(stdin), readset)) { | |
1139 | /* Read as much as possible. */ | |
1140 | len = read(fileno(stdin), buf, sizeof(buf)); | |
22616013 | 1141 | if (len < 0 && |
1142 | (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK)) | |
3c0ef626 | 1143 | return; /* we'll try again later */ |
1144 | if (len <= 0) { | |
1145 | /* | |
1146 | * Received EOF or error. They are treated | |
1147 | * similarly, except that an error message is printed | |
1148 | * if it was an error condition. | |
1149 | */ | |
1150 | if (len < 0) { | |
22616013 | 1151 | snprintf(buf, sizeof buf, "read: %.100s\r\n", |
1152 | strerror(errno)); | |
3c0ef626 | 1153 | buffer_append(&stderr_buffer, buf, strlen(buf)); |
1154 | } | |
1155 | /* Mark that we have seen EOF. */ | |
1156 | stdin_eof = 1; | |
1157 | /* | |
1158 | * Send an EOF message to the server unless there is | |
1159 | * data in the buffer. If there is data in the | |
1160 | * buffer, no message will be sent now. Code | |
1161 | * elsewhere will send the EOF when the buffer | |
1162 | * becomes empty if stdin_eof is set. | |
1163 | */ | |
1164 | if (buffer_len(&stdin_buffer) == 0) { | |
1165 | packet_start(SSH_CMSG_EOF); | |
1166 | packet_send(); | |
1167 | } | |
22616013 | 1168 | } else if (escape_char1 == SSH_ESCAPECHAR_NONE) { |
3c0ef626 | 1169 | /* |
1170 | * Normal successful read, and no escape character. | |
1171 | * Just append the data to buffer. | |
1172 | */ | |
1173 | buffer_append(&stdin_buffer, buf, len); | |
1174 | } else { | |
1175 | /* | |
22616013 | 1176 | * Normal, successful read. But we have an escape |
1177 | * character and have to process the characters one | |
1178 | * by one. | |
3c0ef626 | 1179 | */ |
22616013 | 1180 | if (process_escapes(NULL, &stdin_buffer, |
1181 | &stdout_buffer, &stderr_buffer, buf, len) == -1) | |
3c0ef626 | 1182 | return; |
1183 | } | |
1184 | } | |
1185 | } | |
1186 | ||
1187 | static void | |
9108f8d9 | 1188 | client_process_output(fd_set *writeset) |
3c0ef626 | 1189 | { |
1190 | int len; | |
1191 | char buf[100]; | |
1192 | ||
1193 | /* Write buffered output to stdout. */ | |
1194 | if (FD_ISSET(fileno(stdout), writeset)) { | |
1195 | /* Write as much data as possible. */ | |
1196 | len = write(fileno(stdout), buffer_ptr(&stdout_buffer), | |
1197 | buffer_len(&stdout_buffer)); | |
1198 | if (len <= 0) { | |
22616013 | 1199 | if (errno == EINTR || errno == EAGAIN || |
1200 | errno == EWOULDBLOCK) | |
3c0ef626 | 1201 | len = 0; |
1202 | else { | |
1203 | /* | |
1204 | * An error or EOF was encountered. Put an | |
1205 | * error message to stderr buffer. | |
1206 | */ | |
22616013 | 1207 | snprintf(buf, sizeof buf, |
1208 | "write stdout: %.50s\r\n", strerror(errno)); | |
3c0ef626 | 1209 | buffer_append(&stderr_buffer, buf, strlen(buf)); |
1210 | quit_pending = 1; | |
1211 | return; | |
1212 | } | |
1213 | } | |
1214 | /* Consume printed data from the buffer. */ | |
1215 | buffer_consume(&stdout_buffer, len); | |
3c0ef626 | 1216 | } |
1217 | /* Write buffered output to stderr. */ | |
1218 | if (FD_ISSET(fileno(stderr), writeset)) { | |
1219 | /* Write as much data as possible. */ | |
1220 | len = write(fileno(stderr), buffer_ptr(&stderr_buffer), | |
1221 | buffer_len(&stderr_buffer)); | |
1222 | if (len <= 0) { | |
22616013 | 1223 | if (errno == EINTR || errno == EAGAIN || |
1224 | errno == EWOULDBLOCK) | |
3c0ef626 | 1225 | len = 0; |
1226 | else { | |
22616013 | 1227 | /* |
1228 | * EOF or error, but can't even print | |
1229 | * error message. | |
1230 | */ | |
3c0ef626 | 1231 | quit_pending = 1; |
1232 | return; | |
1233 | } | |
1234 | } | |
1235 | /* Consume printed characters from the buffer. */ | |
1236 | buffer_consume(&stderr_buffer, len); | |
3c0ef626 | 1237 | } |
1238 | } | |
1239 | ||
1240 | /* | |
1241 | * Get packets from the connection input buffer, and process them as long as | |
1242 | * there are packets available. | |
1243 | * | |
1244 | * Any unknown packets received during the actual | |
1245 | * session cause the session to terminate. This is | |
1246 | * intended to make debugging easier since no | |
1247 | * confirmations are sent. Any compatible protocol | |
1248 | * extensions must be negotiated during the | |
1249 | * preparatory phase. | |
1250 | */ | |
1251 | ||
1252 | static void | |
1253 | client_process_buffered_input_packets(void) | |
1254 | { | |
22616013 | 1255 | dispatch_run(DISPATCH_NONBLOCK, &quit_pending, |
1256 | compat20 ? xxx_kex : NULL); | |
3c0ef626 | 1257 | } |
1258 | ||
1259 | /* scan buf[] for '~' before sending data to the peer */ | |
1260 | ||
22616013 | 1261 | /* Helper: allocate a new escape_filter_ctx and fill in its escape char */ |
1262 | void * | |
1263 | client_new_escape_filter_ctx(int escape_char) | |
3c0ef626 | 1264 | { |
22616013 | 1265 | struct escape_filter_ctx *ret; |
1266 | ||
1267 | ret = xmalloc(sizeof(*ret)); | |
1268 | ret->escape_pending = 0; | |
1269 | ret->escape_char = escape_char; | |
1270 | return (void *)ret; | |
1271 | } | |
1272 | ||
1273 | /* Free the escape filter context on channel free */ | |
1274 | void | |
1275 | client_filter_cleanup(int cid, void *ctx) | |
1276 | { | |
1277 | xfree(ctx); | |
1278 | } | |
1279 | ||
1280 | int | |
1281 | client_simple_escape_filter(Channel *c, char *buf, int len) | |
1282 | { | |
1283 | if (c->extended_usage != CHAN_EXTENDED_WRITE) | |
1284 | return 0; | |
1285 | ||
1286 | return process_escapes(c, &c->input, &c->output, &c->extended, | |
1287 | buf, len); | |
3c0ef626 | 1288 | } |
1289 | ||
1290 | static void | |
1291 | client_channel_closed(int id, void *arg) | |
1292 | { | |
3c0ef626 | 1293 | channel_cancel_cleanup(id); |
1294 | session_closed = 1; | |
cdd66111 | 1295 | leave_raw_mode(); |
3c0ef626 | 1296 | } |
1297 | ||
1298 | /* | |
1299 | * Implements the interactive session with the server. This is called after | |
1300 | * the user has been authenticated, and a command has been started on the | |
1301 | * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character | |
1302 | * used as an escape character for terminating or suspending the session. | |
1303 | */ | |
1304 | ||
1305 | int | |
1306 | client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id) | |
1307 | { | |
1308 | fd_set *readset = NULL, *writeset = NULL; | |
1309 | double start_time, total_time; | |
c9f39d2c | 1310 | int max_fd = 0, max_fd2 = 0, len, rekeying = 0; |
22616013 | 1311 | u_int64_t ibytes, obytes; |
c9f39d2c | 1312 | u_int nalloc = 0; |
3c0ef626 | 1313 | char buf[100]; |
1314 | ||
1315 | debug("Entering interactive session."); | |
1316 | ||
1317 | start_time = get_current_time(); | |
1318 | ||
1319 | /* Initialize variables. */ | |
22616013 | 1320 | escape_pending1 = 0; |
3c0ef626 | 1321 | last_was_cr = 1; |
1322 | exit_status = -1; | |
1323 | stdin_eof = 0; | |
1324 | buffer_high = 64 * 1024; | |
1325 | connection_in = packet_get_connection_in(); | |
1326 | connection_out = packet_get_connection_out(); | |
1327 | max_fd = MAX(connection_in, connection_out); | |
22616013 | 1328 | if (muxserver_sock != -1) |
1329 | max_fd = MAX(max_fd, muxserver_sock); | |
3c0ef626 | 1330 | |
1331 | if (!compat20) { | |
1332 | /* enable nonblocking unless tty */ | |
1333 | if (!isatty(fileno(stdin))) | |
1334 | set_nonblock(fileno(stdin)); | |
1335 | if (!isatty(fileno(stdout))) | |
1336 | set_nonblock(fileno(stdout)); | |
1337 | if (!isatty(fileno(stderr))) | |
1338 | set_nonblock(fileno(stderr)); | |
1339 | max_fd = MAX(max_fd, fileno(stdin)); | |
1340 | max_fd = MAX(max_fd, fileno(stdout)); | |
1341 | max_fd = MAX(max_fd, fileno(stderr)); | |
1342 | } | |
3c0ef626 | 1343 | quit_pending = 0; |
22616013 | 1344 | escape_char1 = escape_char_arg; |
3c0ef626 | 1345 | |
1346 | /* Initialize buffers. */ | |
1347 | buffer_init(&stdin_buffer); | |
1348 | buffer_init(&stdout_buffer); | |
1349 | buffer_init(&stderr_buffer); | |
1350 | ||
1351 | client_init_dispatch(); | |
1352 | ||
6a9b3198 | 1353 | /* |
1354 | * Set signal handlers, (e.g. to restore non-blocking mode) | |
1355 | * but don't overwrite SIG_IGN, matches behaviour from rsh(1) | |
1356 | */ | |
996d5e62 | 1357 | if (signal(SIGHUP, SIG_IGN) != SIG_IGN) |
1358 | signal(SIGHUP, signal_handler); | |
6a9b3198 | 1359 | if (signal(SIGINT, SIG_IGN) != SIG_IGN) |
1360 | signal(SIGINT, signal_handler); | |
1361 | if (signal(SIGQUIT, SIG_IGN) != SIG_IGN) | |
1362 | signal(SIGQUIT, signal_handler); | |
1363 | if (signal(SIGTERM, SIG_IGN) != SIG_IGN) | |
1364 | signal(SIGTERM, signal_handler); | |
996d5e62 | 1365 | signal(SIGWINCH, window_change_handler); |
3c0ef626 | 1366 | |
1367 | if (have_pty) | |
1368 | enter_raw_mode(); | |
1369 | ||
1370 | if (compat20) { | |
1371 | session_ident = ssh2_chan_id; | |
22616013 | 1372 | if (escape_char_arg != SSH_ESCAPECHAR_NONE) |
3c0ef626 | 1373 | channel_register_filter(session_ident, |
22616013 | 1374 | client_simple_escape_filter, NULL, |
1375 | client_filter_cleanup, | |
1376 | client_new_escape_filter_ctx(escape_char_arg)); | |
3c0ef626 | 1377 | if (session_ident != -1) |
1378 | channel_register_cleanup(session_ident, | |
2c06c99b | 1379 | client_channel_closed, 0); |
3c0ef626 | 1380 | } else { |
1381 | /* Check if we should immediately send eof on stdin. */ | |
1382 | client_check_initial_eof_on_stdin(); | |
1383 | } | |
1384 | ||
1385 | /* Main loop of the client for the interactive session mode. */ | |
1386 | while (!quit_pending) { | |
1387 | ||
1388 | /* Process buffered packets sent by the server. */ | |
1389 | client_process_buffered_input_packets(); | |
1390 | ||
1391 | if (compat20 && session_closed && !channel_still_open()) | |
1392 | break; | |
1393 | ||
1394 | rekeying = (xxx_kex != NULL && !xxx_kex->done); | |
1395 | ||
1396 | if (rekeying) { | |
1397 | debug("rekeying in progress"); | |
1398 | } else { | |
1399 | /* | |
1400 | * Make packets of buffered stdin data, and buffer | |
1401 | * them for sending to the server. | |
1402 | */ | |
1403 | if (!compat20) | |
1404 | client_make_packets_from_stdin_data(); | |
1405 | ||
1406 | /* | |
1407 | * Make packets from buffered channel data, and | |
1408 | * enqueue them for sending to the server. | |
1409 | */ | |
1410 | if (packet_not_very_much_data_to_write()) | |
1411 | channel_output_poll(); | |
1412 | ||
1413 | /* | |
1414 | * Check if the window size has changed, and buffer a | |
1415 | * message about it to the server if so. | |
1416 | */ | |
1417 | client_check_window_change(); | |
1418 | ||
1419 | if (quit_pending) | |
1420 | break; | |
1421 | } | |
1422 | /* | |
1423 | * Wait until we have something to do (something becomes | |
1424 | * available on one of the descriptors). | |
1425 | */ | |
1426 | max_fd2 = max_fd; | |
1427 | client_wait_until_can_do_something(&readset, &writeset, | |
1428 | &max_fd2, &nalloc, rekeying); | |
1429 | ||
1430 | if (quit_pending) | |
1431 | break; | |
1432 | ||
1433 | /* Do channel operations unless rekeying in progress. */ | |
1434 | if (!rekeying) { | |
1435 | channel_after_select(readset, writeset); | |
f97edba6 | 1436 | |
071d8001 | 1437 | #ifdef GSSAPI |
f97edba6 | 1438 | if (options.gss_renewal_rekey && |
db5d66a5 | 1439 | ssh_gssapi_credentials_updated((Gssctxt *)GSS_C_NO_CONTEXT)) { |
f97edba6 | 1440 | debug("credentials updated - forcing rekey"); |
1441 | need_rekeying = 1; | |
1442 | } | |
071d8001 | 1443 | #endif |
f97edba6 | 1444 | |
0fff78ff | 1445 | if (need_rekeying || packet_need_rekeying()) { |
1446 | debug("need rekeying"); | |
3c0ef626 | 1447 | xxx_kex->done = 0; |
1448 | kex_send_kexinit(xxx_kex); | |
1449 | need_rekeying = 0; | |
1450 | } | |
1451 | } | |
1452 | ||
1453 | /* Buffer input from the connection. */ | |
1454 | client_process_net_input(readset); | |
1455 | ||
c9f39d2c | 1456 | /* Accept control connections. */ |
22616013 | 1457 | if (muxserver_sock != -1 &&FD_ISSET(muxserver_sock, readset)) { |
1458 | if (muxserver_accept_control()) | |
1459 | quit_pending = 1; | |
1460 | } | |
c9f39d2c | 1461 | |
3c0ef626 | 1462 | if (quit_pending) |
1463 | break; | |
1464 | ||
1465 | if (!compat20) { | |
1466 | /* Buffer data from stdin */ | |
1467 | client_process_input(readset); | |
1468 | /* | |
1469 | * Process output to stdout and stderr. Output to | |
1470 | * the connection is processed elsewhere (above). | |
1471 | */ | |
1472 | client_process_output(writeset); | |
1473 | } | |
1474 | ||
22616013 | 1475 | /* |
1476 | * Send as much buffered packet data as possible to the | |
1477 | * sender. | |
1478 | */ | |
3c0ef626 | 1479 | if (FD_ISSET(connection_out, writeset)) |
1480 | packet_write_poll(); | |
1481 | } | |
1482 | if (readset) | |
1483 | xfree(readset); | |
1484 | if (writeset) | |
1485 | xfree(writeset); | |
1486 | ||
1487 | /* Terminate the session. */ | |
1488 | ||
1489 | /* Stop watching for window change. */ | |
996d5e62 | 1490 | signal(SIGWINCH, SIG_DFL); |
3c0ef626 | 1491 | |
1492 | channel_free_all(); | |
1493 | ||
1494 | if (have_pty) | |
1495 | leave_raw_mode(); | |
1496 | ||
1497 | /* restore blocking io */ | |
1498 | if (!isatty(fileno(stdin))) | |
1499 | unset_nonblock(fileno(stdin)); | |
1500 | if (!isatty(fileno(stdout))) | |
1501 | unset_nonblock(fileno(stdout)); | |
1502 | if (!isatty(fileno(stderr))) | |
1503 | unset_nonblock(fileno(stderr)); | |
1504 | ||
cdd66111 | 1505 | /* |
1506 | * If there was no shell or command requested, there will be no remote | |
1507 | * exit status to be returned. In that case, clear error code if the | |
1508 | * connection was deliberately terminated at this end. | |
1509 | */ | |
1510 | if (no_shell_flag && received_signal == SIGTERM) { | |
1511 | received_signal = 0; | |
1512 | exit_status = 0; | |
9cb1827b | 1513 | } |
12408a1b | 1514 | |
cdd66111 | 1515 | if (received_signal) |
1516 | fatal("Killed by signal %d.", (int) received_signal); | |
1517 | ||
3c0ef626 | 1518 | /* |
1519 | * In interactive mode (with pseudo tty) display a message indicating | |
1520 | * that the connection has been closed. | |
1521 | */ | |
1522 | if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) { | |
22616013 | 1523 | snprintf(buf, sizeof buf, |
1524 | "Connection to %.64s closed.\r\n", host); | |
3c0ef626 | 1525 | buffer_append(&stderr_buffer, buf, strlen(buf)); |
1526 | } | |
1527 | ||
1528 | /* Output any buffered data for stdout. */ | |
1529 | while (buffer_len(&stdout_buffer) > 0) { | |
1530 | len = write(fileno(stdout), buffer_ptr(&stdout_buffer), | |
1531 | buffer_len(&stdout_buffer)); | |
1532 | if (len <= 0) { | |
1533 | error("Write failed flushing stdout buffer."); | |
1534 | break; | |
1535 | } | |
1536 | buffer_consume(&stdout_buffer, len); | |
3c0ef626 | 1537 | } |
1538 | ||
1539 | /* Output any buffered data for stderr. */ | |
1540 | while (buffer_len(&stderr_buffer) > 0) { | |
1541 | len = write(fileno(stderr), buffer_ptr(&stderr_buffer), | |
1542 | buffer_len(&stderr_buffer)); | |
1543 | if (len <= 0) { | |
1544 | error("Write failed flushing stderr buffer."); | |
1545 | break; | |
1546 | } | |
1547 | buffer_consume(&stderr_buffer, len); | |
3c0ef626 | 1548 | } |
1549 | ||
1550 | /* Clear and free any buffers. */ | |
1551 | memset(buf, 0, sizeof(buf)); | |
1552 | buffer_free(&stdin_buffer); | |
1553 | buffer_free(&stdout_buffer); | |
1554 | buffer_free(&stderr_buffer); | |
1555 | ||
1556 | /* Report bytes transferred, and transfer rates. */ | |
1557 | total_time = get_current_time() - start_time; | |
22616013 | 1558 | packet_get_state(MODE_IN, NULL, NULL, NULL, &ibytes); |
1559 | packet_get_state(MODE_OUT, NULL, NULL, NULL, &obytes); | |
1560 | verbose("Transferred: sent %llu, received %llu bytes, in %.1f seconds", | |
1561 | obytes, ibytes, total_time); | |
3c0ef626 | 1562 | if (total_time > 0) |
22616013 | 1563 | verbose("Bytes per second: sent %.1f, received %.1f", |
1564 | obytes / total_time, ibytes / total_time); | |
3c0ef626 | 1565 | /* Return the exit status of the program. */ |
1566 | debug("Exit status %d", exit_status); | |
1567 | return exit_status; | |
1568 | } | |
1569 | ||
1570 | /*********/ | |
1571 | ||
1572 | static void | |
e9a17296 | 1573 | client_input_stdout_data(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 1574 | { |
1575 | u_int data_len; | |
1576 | char *data = packet_get_string(&data_len); | |
e9a17296 | 1577 | packet_check_eom(); |
3c0ef626 | 1578 | buffer_append(&stdout_buffer, data, data_len); |
1579 | memset(data, 0, data_len); | |
1580 | xfree(data); | |
1581 | } | |
1582 | static void | |
e9a17296 | 1583 | client_input_stderr_data(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 1584 | { |
1585 | u_int data_len; | |
1586 | char *data = packet_get_string(&data_len); | |
e9a17296 | 1587 | packet_check_eom(); |
3c0ef626 | 1588 | buffer_append(&stderr_buffer, data, data_len); |
1589 | memset(data, 0, data_len); | |
1590 | xfree(data); | |
1591 | } | |
1592 | static void | |
e9a17296 | 1593 | client_input_exit_status(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 1594 | { |
3c0ef626 | 1595 | exit_status = packet_get_int(); |
e9a17296 | 1596 | packet_check_eom(); |
3c0ef626 | 1597 | /* Acknowledge the exit. */ |
1598 | packet_start(SSH_CMSG_EXIT_CONFIRMATION); | |
1599 | packet_send(); | |
1600 | /* | |
1601 | * Must wait for packet to be sent since we are | |
1602 | * exiting the loop. | |
1603 | */ | |
1604 | packet_write_wait(); | |
1605 | /* Flag that we want to exit. */ | |
1606 | quit_pending = 1; | |
1607 | } | |
cdd66111 | 1608 | static void |
1609 | client_input_agent_open(int type, u_int32_t seq, void *ctxt) | |
1610 | { | |
1611 | Channel *c = NULL; | |
1612 | int remote_id, sock; | |
1613 | ||
1614 | /* Read the remote channel number from the message. */ | |
1615 | remote_id = packet_get_int(); | |
1616 | packet_check_eom(); | |
1617 | ||
1618 | /* | |
1619 | * Get a connection to the local authentication agent (this may again | |
1620 | * get forwarded). | |
1621 | */ | |
1622 | sock = ssh_get_authentication_socket(); | |
1623 | ||
1624 | /* | |
1625 | * If we could not connect the agent, send an error message back to | |
1626 | * the server. This should never happen unless the agent dies, | |
1627 | * because authentication forwarding is only enabled if we have an | |
1628 | * agent. | |
1629 | */ | |
1630 | if (sock >= 0) { | |
1631 | c = channel_new("", SSH_CHANNEL_OPEN, sock, sock, | |
1632 | -1, 0, 0, 0, "authentication agent connection", 1); | |
1633 | c->remote_id = remote_id; | |
1634 | c->force_drain = 1; | |
1635 | } | |
1636 | if (c == NULL) { | |
1637 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
1638 | packet_put_int(remote_id); | |
1639 | } else { | |
1640 | /* Send a confirmation to the remote host. */ | |
1641 | debug("Forwarding authentication connection."); | |
1642 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1643 | packet_put_int(remote_id); | |
1644 | packet_put_int(c->self); | |
1645 | } | |
1646 | packet_send(); | |
1647 | } | |
3c0ef626 | 1648 | |
1649 | static Channel * | |
1650 | client_request_forwarded_tcpip(const char *request_type, int rchan) | |
1651 | { | |
41b2f314 | 1652 | Channel *c = NULL; |
3c0ef626 | 1653 | char *listen_address, *originator_address; |
91d9cdd3 | 1654 | u_short listen_port, originator_port; |
3c0ef626 | 1655 | |
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(); | |
e9a17296 | 1661 | packet_check_eom(); |
3c0ef626 | 1662 | |
22616013 | 1663 | debug("client_request_forwarded_tcpip: listen %s port %d, " |
1664 | "originator %s port %d", listen_address, listen_port, | |
1665 | originator_address, originator_port); | |
1666 | ||
1667 | c = channel_connect_by_listen_address(listen_port, | |
1668 | "forwarded-tcpip", originator_address); | |
3c0ef626 | 1669 | |
3c0ef626 | 1670 | xfree(originator_address); |
1671 | xfree(listen_address); | |
1672 | return c; | |
1673 | } | |
1674 | ||
41b2f314 | 1675 | static Channel * |
3c0ef626 | 1676 | client_request_x11(const char *request_type, int rchan) |
1677 | { | |
1678 | Channel *c = NULL; | |
1679 | char *originator; | |
91d9cdd3 | 1680 | u_short originator_port; |
3c0ef626 | 1681 | int sock; |
1682 | ||
1683 | if (!options.forward_x11) { | |
1684 | error("Warning: ssh server tried X11 forwarding."); | |
22616013 | 1685 | error("Warning: this is probably a break-in attempt by a " |
1686 | "malicious server."); | |
3c0ef626 | 1687 | return NULL; |
1688 | } | |
1689 | originator = packet_get_string(NULL); | |
1690 | if (datafellows & SSH_BUG_X11FWD) { | |
1691 | debug2("buggy server: x11 request w/o originator_port"); | |
1692 | originator_port = 0; | |
1693 | } else { | |
1694 | originator_port = packet_get_int(); | |
1695 | } | |
e9a17296 | 1696 | packet_check_eom(); |
3c0ef626 | 1697 | /* XXX check permission */ |
1698 | debug("client_request_x11: request from %s %d", originator, | |
1699 | originator_port); | |
1700 | xfree(originator); | |
1701 | sock = x11_connect_display(); | |
1702 | if (sock < 0) | |
1703 | return NULL; | |
76d45d2f | 1704 | /* again is this really necessary for X11? */ |
1705 | if (options.hpn_disabled) | |
3c0ef626 | 1706 | c = channel_new("x11", |
1707 | SSH_CHANNEL_X11_OPEN, sock, sock, -1, | |
0fff78ff | 1708 | CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1); |
76d45d2f | 1709 | else |
1710 | c = channel_new("x11", | |
1711 | SSH_CHANNEL_X11_OPEN, sock, sock, -1, | |
1712 | options.hpn_buffer_size, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1); | |
3c0ef626 | 1713 | c->force_drain = 1; |
1714 | return c; | |
1715 | } | |
1716 | ||
41b2f314 | 1717 | static Channel * |
3c0ef626 | 1718 | client_request_agent(const char *request_type, int rchan) |
1719 | { | |
1720 | Channel *c = NULL; | |
1721 | int sock; | |
1722 | ||
1723 | if (!options.forward_agent) { | |
1724 | error("Warning: ssh server tried agent forwarding."); | |
22616013 | 1725 | error("Warning: this is probably a break-in attempt by a " |
1726 | "malicious server."); | |
3c0ef626 | 1727 | return NULL; |
1728 | } | |
799ae497 | 1729 | sock = ssh_get_authentication_socket(); |
3c0ef626 | 1730 | if (sock < 0) |
1731 | return NULL; | |
76d45d2f | 1732 | if (options.hpn_disabled) |
3c0ef626 | 1733 | c = channel_new("authentication agent connection", |
1734 | SSH_CHANNEL_OPEN, sock, sock, -1, | |
76d45d2f | 1735 | CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0, |
1736 | "authentication agent connection", 1); | |
1737 | else | |
1738 | c = channel_new("authentication agent connection", | |
1739 | SSH_CHANNEL_OPEN, sock, sock, -1, | |
1740 | options.hpn_buffer_size, options.hpn_buffer_size, 0, | |
0fff78ff | 1741 | "authentication agent connection", 1); |
3c0ef626 | 1742 | c->force_drain = 1; |
1743 | return c; | |
1744 | } | |
1745 | ||
d4487008 | 1746 | int |
1747 | client_request_tun_fwd(int tun_mode, int local_tun, int remote_tun) | |
1748 | { | |
1749 | Channel *c; | |
1750 | int fd; | |
1751 | ||
1752 | if (tun_mode == SSH_TUNMODE_NO) | |
1753 | return 0; | |
1754 | ||
1755 | if (!compat20) { | |
91d9cdd3 | 1756 | error("Tunnel forwarding is not supported for protocol 1"); |
d4487008 | 1757 | return -1; |
1758 | } | |
1759 | ||
1760 | debug("Requesting tun unit %d in mode %d", local_tun, tun_mode); | |
1761 | ||
1762 | /* Open local tunnel device */ | |
1763 | if ((fd = tun_open(local_tun, tun_mode)) == -1) { | |
1764 | error("Tunnel device open failed."); | |
1765 | return -1; | |
1766 | } | |
1767 | ||
76d45d2f | 1768 | if(options.hpn_disabled) |
1769 | c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1, | |
1770 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, | |
1771 | 0, "tun", 1); | |
1772 | else | |
d4487008 | 1773 | c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1, |
76d45d2f | 1774 | options.hpn_buffer_size, CHAN_TCP_PACKET_DEFAULT, |
1775 | 0, "tun", 1); | |
d4487008 | 1776 | c->datagram = 1; |
1777 | ||
76d45d2f | 1778 | |
1779 | ||
d4487008 | 1780 | #if defined(SSH_TUN_FILTER) |
1781 | if (options.tun_open == SSH_TUNMODE_POINTOPOINT) | |
1782 | channel_register_filter(c->self, sys_tun_infilter, | |
22616013 | 1783 | sys_tun_outfilter, NULL, NULL); |
d4487008 | 1784 | #endif |
1785 | ||
1786 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1787 | packet_put_cstring("tun@openssh.com"); | |
1788 | packet_put_int(c->self); | |
1789 | packet_put_int(c->local_window_max); | |
1790 | packet_put_int(c->local_maxpacket); | |
1791 | packet_put_int(tun_mode); | |
1792 | packet_put_int(remote_tun); | |
1793 | packet_send(); | |
1794 | ||
1795 | return 0; | |
1796 | } | |
1797 | ||
3c0ef626 | 1798 | /* XXXX move to generic input handler */ |
1799 | static void | |
e9a17296 | 1800 | client_input_channel_open(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 1801 | { |
1802 | Channel *c = NULL; | |
1803 | char *ctype; | |
3c0ef626 | 1804 | int rchan; |
680cee3b | 1805 | u_int rmaxpack, rwindow, len; |
3c0ef626 | 1806 | |
1807 | ctype = packet_get_string(&len); | |
1808 | rchan = packet_get_int(); | |
1809 | rwindow = packet_get_int(); | |
1810 | rmaxpack = packet_get_int(); | |
1811 | ||
1812 | debug("client_input_channel_open: ctype %s rchan %d win %d max %d", | |
1813 | ctype, rchan, rwindow, rmaxpack); | |
1814 | ||
1815 | if (strcmp(ctype, "forwarded-tcpip") == 0) { | |
1816 | c = client_request_forwarded_tcpip(ctype, rchan); | |
1817 | } else if (strcmp(ctype, "x11") == 0) { | |
1818 | c = client_request_x11(ctype, rchan); | |
1819 | } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) { | |
1820 | c = client_request_agent(ctype, rchan); | |
1821 | } | |
1822 | /* XXX duplicate : */ | |
1823 | if (c != NULL) { | |
1824 | debug("confirm %s", ctype); | |
1825 | c->remote_id = rchan; | |
1826 | c->remote_window = rwindow; | |
1827 | c->remote_maxpacket = rmaxpack; | |
1828 | if (c->type != SSH_CHANNEL_CONNECTING) { | |
1829 | packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1830 | packet_put_int(c->remote_id); | |
1831 | packet_put_int(c->self); | |
1832 | packet_put_int(c->local_window); | |
1833 | packet_put_int(c->local_maxpacket); | |
1834 | packet_send(); | |
1835 | } | |
1836 | } else { | |
1837 | debug("failure %s", ctype); | |
1838 | packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); | |
1839 | packet_put_int(rchan); | |
1840 | packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED); | |
1841 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { | |
1842 | packet_put_cstring("open failed"); | |
1843 | packet_put_cstring(""); | |
1844 | } | |
1845 | packet_send(); | |
1846 | } | |
1847 | xfree(ctype); | |
1848 | } | |
1849 | static void | |
e9a17296 | 1850 | client_input_channel_req(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 1851 | { |
1852 | Channel *c = NULL; | |
c9f39d2c | 1853 | int exitval, id, reply, success = 0; |
3c0ef626 | 1854 | char *rtype; |
1855 | ||
1856 | id = packet_get_int(); | |
1857 | rtype = packet_get_string(NULL); | |
1858 | reply = packet_get_char(); | |
1859 | ||
1860 | debug("client_input_channel_req: channel %d rtype %s reply %d", | |
1861 | id, rtype, reply); | |
1862 | ||
c9f39d2c | 1863 | if (id == -1) { |
1864 | error("client_input_channel_req: request for channel -1"); | |
1865 | } else if ((c = channel_lookup(id)) == NULL) { | |
22616013 | 1866 | error("client_input_channel_req: channel %d: " |
1867 | "unknown channel", id); | |
1868 | } else if (strcmp(rtype, "eow@openssh.com") == 0) { | |
1869 | packet_check_eom(); | |
1870 | chan_rcvd_eow(c); | |
3c0ef626 | 1871 | } else if (strcmp(rtype, "exit-status") == 0) { |
c9f39d2c | 1872 | exitval = packet_get_int(); |
1873 | if (id == session_ident) { | |
1874 | success = 1; | |
1875 | exit_status = exitval; | |
1876 | } else if (c->ctl_fd == -1) { | |
1877 | error("client_input_channel_req: unexpected channel %d", | |
1878 | session_ident); | |
1879 | } else { | |
1880 | atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval)); | |
1881 | success = 1; | |
1882 | } | |
e9a17296 | 1883 | packet_check_eom(); |
3c0ef626 | 1884 | } |
1885 | if (reply) { | |
1886 | packet_start(success ? | |
1887 | SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE); | |
91d9cdd3 | 1888 | packet_put_int(c->remote_id); |
3c0ef626 | 1889 | packet_send(); |
1890 | } | |
1891 | xfree(rtype); | |
1892 | } | |
e9a17296 | 1893 | static void |
1894 | client_input_global_request(int type, u_int32_t seq, void *ctxt) | |
1895 | { | |
1896 | char *rtype; | |
1897 | int want_reply; | |
1898 | int success = 0; | |
1899 | ||
1900 | rtype = packet_get_string(NULL); | |
1901 | want_reply = packet_get_char(); | |
cdd66111 | 1902 | debug("client_input_global_request: rtype %s want_reply %d", |
1903 | rtype, want_reply); | |
e9a17296 | 1904 | if (want_reply) { |
1905 | packet_start(success ? | |
1906 | SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE); | |
1907 | packet_send(); | |
1908 | packet_write_wait(); | |
1909 | } | |
1910 | xfree(rtype); | |
1911 | } | |
3c0ef626 | 1912 | |
c9f39d2c | 1913 | void |
1914 | client_session2_setup(int id, int want_tty, int want_subsystem, | |
22616013 | 1915 | const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env) |
c9f39d2c | 1916 | { |
1917 | int len; | |
996d5e62 | 1918 | Channel *c = NULL; |
c9f39d2c | 1919 | |
1920 | debug2("%s: id %d", __func__, id); | |
1921 | ||
996d5e62 | 1922 | if ((c = channel_lookup(id)) == NULL) |
1923 | fatal("client_session2_setup: channel %d: unknown channel", id); | |
1924 | ||
c9f39d2c | 1925 | if (want_tty) { |
1926 | struct winsize ws; | |
c9f39d2c | 1927 | |
1928 | /* Store window size in the packet. */ | |
1929 | if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0) | |
1930 | memset(&ws, 0, sizeof(ws)); | |
1931 | ||
22616013 | 1932 | channel_request_start(id, "pty-req", 1); |
1933 | client_expect_confirm(id, "PTY allocation", 0); | |
c9f39d2c | 1934 | packet_put_cstring(term != NULL ? term : ""); |
9108f8d9 | 1935 | packet_put_int((u_int)ws.ws_col); |
1936 | packet_put_int((u_int)ws.ws_row); | |
1937 | packet_put_int((u_int)ws.ws_xpixel); | |
1938 | packet_put_int((u_int)ws.ws_ypixel); | |
22616013 | 1939 | if (tiop == NULL) |
1940 | tiop = get_saved_tio(); | |
1941 | tty_make_modes(-1, tiop); | |
c9f39d2c | 1942 | packet_send(); |
1943 | /* XXX wait for reply */ | |
996d5e62 | 1944 | c->client_tty = 1; |
c9f39d2c | 1945 | } |
1946 | ||
1947 | /* Transfer any environment variables from client to server */ | |
1948 | if (options.num_send_env != 0 && env != NULL) { | |
1949 | int i, j, matched; | |
1950 | char *name, *val; | |
1951 | ||
1952 | debug("Sending environment."); | |
1953 | for (i = 0; env[i] != NULL; i++) { | |
1954 | /* Split */ | |
1955 | name = xstrdup(env[i]); | |
1956 | if ((val = strchr(name, '=')) == NULL) { | |
2c06c99b | 1957 | xfree(name); |
c9f39d2c | 1958 | continue; |
1959 | } | |
1960 | *val++ = '\0'; | |
1961 | ||
1962 | matched = 0; | |
1963 | for (j = 0; j < options.num_send_env; j++) { | |
1964 | if (match_pattern(name, options.send_env[j])) { | |
1965 | matched = 1; | |
1966 | break; | |
1967 | } | |
1968 | } | |
1969 | if (!matched) { | |
1970 | debug3("Ignored env %s", name); | |
2c06c99b | 1971 | xfree(name); |
c9f39d2c | 1972 | continue; |
1973 | } | |
1974 | ||
1975 | debug("Sending env %s = %s", name, val); | |
1976 | channel_request_start(id, "env", 0); | |
1977 | packet_put_cstring(name); | |
1978 | packet_put_cstring(val); | |
1979 | packet_send(); | |
2c06c99b | 1980 | xfree(name); |
c9f39d2c | 1981 | } |
1982 | } | |
1983 | ||
1984 | len = buffer_len(cmd); | |
1985 | if (len > 0) { | |
1986 | if (len > 900) | |
1987 | len = 900; | |
1988 | if (want_subsystem) { | |
22616013 | 1989 | debug("Sending subsystem: %.*s", |
1990 | len, (u_char*)buffer_ptr(cmd)); | |
1991 | channel_request_start(id, "subsystem", 1); | |
1992 | client_expect_confirm(id, "subsystem", 1); | |
c9f39d2c | 1993 | } else { |
22616013 | 1994 | debug("Sending command: %.*s", |
1995 | len, (u_char*)buffer_ptr(cmd)); | |
1996 | channel_request_start(id, "exec", 1); | |
1997 | client_expect_confirm(id, "exec", 1); | |
c9f39d2c | 1998 | } |
1999 | packet_put_string(buffer_ptr(cmd), buffer_len(cmd)); | |
2000 | packet_send(); | |
2001 | } else { | |
22616013 | 2002 | channel_request_start(id, "shell", 1); |
2003 | client_expect_confirm(id, "shell", 1); | |
c9f39d2c | 2004 | packet_send(); |
2005 | } | |
2006 | } | |
2007 | ||
3c0ef626 | 2008 | static void |
2009 | client_init_dispatch_20(void) | |
2010 | { | |
2011 | dispatch_init(&dispatch_protocol_error); | |
700318f3 | 2012 | |
3c0ef626 | 2013 | dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose); |
2014 | dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data); | |
2015 | dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof); | |
2016 | dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data); | |
2017 | dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open); | |
2018 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); | |
2019 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); | |
2020 | dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req); | |
2021 | dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust); | |
22616013 | 2022 | dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm); |
2023 | dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm); | |
e9a17296 | 2024 | dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request); |
3c0ef626 | 2025 | |
2026 | /* rekeying */ | |
2027 | dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit); | |
700318f3 | 2028 | |
2029 | /* global request reply messages */ | |
2030 | dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply); | |
2031 | dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply); | |
3c0ef626 | 2032 | } |
22616013 | 2033 | |
3c0ef626 | 2034 | static void |
2035 | client_init_dispatch_13(void) | |
2036 | { | |
2037 | dispatch_init(NULL); | |
2038 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close); | |
2039 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation); | |
2040 | dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data); | |
2041 | dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); | |
2042 | dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); | |
2043 | dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open); | |
2044 | dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status); | |
2045 | dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data); | |
2046 | dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data); | |
2047 | ||
2048 | dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ? | |
cdd66111 | 2049 | &client_input_agent_open : &deny_input_open); |
3c0ef626 | 2050 | dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ? |
2051 | &x11_input_open : &deny_input_open); | |
2052 | } | |
22616013 | 2053 | |
3c0ef626 | 2054 | static void |
2055 | client_init_dispatch_15(void) | |
2056 | { | |
2057 | client_init_dispatch_13(); | |
2058 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof); | |
2059 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose); | |
2060 | } | |
22616013 | 2061 | |
3c0ef626 | 2062 | static void |
2063 | client_init_dispatch(void) | |
2064 | { | |
2065 | if (compat20) | |
2066 | client_init_dispatch_20(); | |
2067 | else if (compat13) | |
2068 | client_init_dispatch_13(); | |
2069 | else | |
2070 | client_init_dispatch_15(); | |
2071 | } | |
cdd66111 | 2072 | |
2073 | /* client specific fatal cleanup */ | |
2074 | void | |
2075 | cleanup_exit(int i) | |
2076 | { | |
2077 | leave_raw_mode(); | |
2078 | leave_non_blocking(); | |
22616013 | 2079 | if (options.control_path != NULL && muxserver_sock != -1) |
c9f39d2c | 2080 | unlink(options.control_path); |
cdd66111 | 2081 | _exit(i); |
2082 | } |