]>
Commit | Line | Data |
---|---|---|
b5afdff5 | 1 | /* $OpenBSD: clientloop.c,v 1.213 2009/07/05 19:28:33 stevesk 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" | |
b5afdff5 | 112 | #include "roaming.h" |
3c0ef626 | 113 | |
f97edba6 | 114 | #ifdef GSSAPI |
115 | #include "ssh-gss.h" | |
116 | #endif | |
117 | ||
3c0ef626 | 118 | /* import options */ |
119 | extern Options options; | |
120 | ||
121 | /* Flag indicating that stdin should be redirected from /dev/null. */ | |
122 | extern int stdin_null_flag; | |
123 | ||
cdd66111 | 124 | /* Flag indicating that no shell has been requested */ |
125 | extern int no_shell_flag; | |
126 | ||
c9f39d2c | 127 | /* Control socket */ |
22616013 | 128 | extern int muxserver_sock; |
c9f39d2c | 129 | |
3c0ef626 | 130 | /* |
131 | * Name of the host we are connecting to. This is the name given on the | |
132 | * command line, or the HostName specified for the user-supplied name in a | |
133 | * configuration file. | |
134 | */ | |
135 | extern char *host; | |
136 | ||
137 | /* | |
138 | * Flag to indicate that we have received a window change signal which has | |
139 | * not yet been processed. This will cause a message indicating the new | |
140 | * window size to be sent to the server a little later. This is volatile | |
141 | * because this is updated in a signal handler. | |
142 | */ | |
e9a17296 | 143 | static volatile sig_atomic_t received_window_change_signal = 0; |
144 | static volatile sig_atomic_t received_signal = 0; | |
3c0ef626 | 145 | |
2c06c99b | 146 | /* Flag indicating whether the user's terminal is in non-blocking mode. */ |
3c0ef626 | 147 | static int in_non_blocking_mode = 0; |
148 | ||
149 | /* Common data for the client loop code. */ | |
9108f8d9 | 150 | static volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */ |
22616013 | 151 | static int escape_char1; /* Escape character. (proto1 only) */ |
152 | static int escape_pending1; /* Last character was an escape (proto1 only) */ | |
3c0ef626 | 153 | static int last_was_cr; /* Last character was a newline. */ |
22616013 | 154 | static int exit_status; /* Used to store the command exit status. */ |
155 | static int stdin_eof; /* EOF has been encountered on stderr. */ | |
3c0ef626 | 156 | static Buffer stdin_buffer; /* Buffer for stdin data. */ |
157 | static Buffer stdout_buffer; /* Buffer for stdout data. */ | |
158 | static Buffer stderr_buffer; /* Buffer for stderr data. */ | |
3c0ef626 | 159 | static u_int buffer_high;/* Soft max buffer size. */ |
160 | static int connection_in; /* Connection to server (input). */ | |
161 | static int connection_out; /* Connection to server (output). */ | |
162 | static int need_rekeying; /* Set to non-zero if rekeying is requested. */ | |
163 | static int session_closed = 0; /* In SSH2: login session closed. */ | |
164 | ||
165 | static void client_init_dispatch(void); | |
166 | int session_ident = -1; | |
167 | ||
22616013 | 168 | /* Track escape per proto2 channel */ |
169 | struct escape_filter_ctx { | |
170 | int escape_pending; | |
171 | int escape_char; | |
c9f39d2c | 172 | }; |
173 | ||
22616013 | 174 | /* Context for channel confirmation replies */ |
175 | struct channel_reply_ctx { | |
176 | const char *request_type; | |
177 | int id, do_close; | |
178 | }; | |
179 | ||
180 | /* Global request success/failure callbacks */ | |
181 | struct global_confirm { | |
182 | TAILQ_ENTRY(global_confirm) entry; | |
183 | global_confirm_cb *cb; | |
184 | void *ctx; | |
185 | int ref_count; | |
186 | }; | |
187 | TAILQ_HEAD(global_confirms, global_confirm); | |
188 | static struct global_confirms global_confirms = | |
189 | TAILQ_HEAD_INITIALIZER(global_confirms); | |
190 | ||
3c0ef626 | 191 | /*XXX*/ |
192 | extern Kex *xxx_kex; | |
193 | ||
c9f39d2c | 194 | void ssh_process_session2_setup(int, int, int, Buffer *); |
195 | ||
3c0ef626 | 196 | /* Restores stdin to blocking mode. */ |
197 | ||
198 | static void | |
199 | leave_non_blocking(void) | |
200 | { | |
201 | if (in_non_blocking_mode) { | |
c9f39d2c | 202 | unset_nonblock(fileno(stdin)); |
3c0ef626 | 203 | in_non_blocking_mode = 0; |
3c0ef626 | 204 | } |
205 | } | |
206 | ||
207 | /* Puts stdin terminal in non-blocking mode. */ | |
208 | ||
209 | static void | |
210 | enter_non_blocking(void) | |
211 | { | |
212 | in_non_blocking_mode = 1; | |
c9f39d2c | 213 | set_nonblock(fileno(stdin)); |
3c0ef626 | 214 | } |
215 | ||
216 | /* | |
217 | * Signal handler for the window change signal (SIGWINCH). This just sets a | |
218 | * flag indicating that the window has changed. | |
219 | */ | |
9108f8d9 | 220 | /*ARGSUSED */ |
3c0ef626 | 221 | static void |
222 | window_change_handler(int sig) | |
223 | { | |
224 | received_window_change_signal = 1; | |
225 | signal(SIGWINCH, window_change_handler); | |
226 | } | |
227 | ||
228 | /* | |
229 | * Signal handler for signals that cause the program to terminate. These | |
230 | * signals must be trapped to restore terminal modes. | |
231 | */ | |
9108f8d9 | 232 | /*ARGSUSED */ |
3c0ef626 | 233 | static void |
234 | signal_handler(int sig) | |
235 | { | |
236 | received_signal = sig; | |
237 | quit_pending = 1; | |
238 | } | |
239 | ||
240 | /* | |
241 | * Returns current time in seconds from Jan 1, 1970 with the maximum | |
242 | * available resolution. | |
243 | */ | |
244 | ||
245 | static double | |
246 | get_current_time(void) | |
247 | { | |
248 | struct timeval tv; | |
249 | gettimeofday(&tv, NULL); | |
250 | return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0; | |
251 | } | |
252 | ||
665a873d | 253 | #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1" |
254 | void | |
255 | client_x11_get_proto(const char *display, const char *xauth_path, | |
256 | u_int trusted, char **_proto, char **_data) | |
257 | { | |
258 | char cmd[1024]; | |
259 | char line[512]; | |
260 | char xdisplay[512]; | |
261 | static char proto[512], data[512]; | |
262 | FILE *f; | |
263 | int got_data = 0, generated = 0, do_unlink = 0, i; | |
264 | char *xauthdir, *xauthfile; | |
265 | struct stat st; | |
266 | ||
267 | xauthdir = xauthfile = NULL; | |
268 | *_proto = proto; | |
269 | *_data = data; | |
270 | proto[0] = data[0] = '\0'; | |
271 | ||
272 | if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) { | |
273 | debug("No xauth program."); | |
274 | } else { | |
275 | if (display == NULL) { | |
276 | debug("x11_get_proto: DISPLAY not set"); | |
277 | return; | |
278 | } | |
279 | /* | |
280 | * Handle FamilyLocal case where $DISPLAY does | |
281 | * not match an authorization entry. For this we | |
282 | * just try "xauth list unix:displaynum.screennum". | |
283 | * XXX: "localhost" match to determine FamilyLocal | |
284 | * is not perfect. | |
285 | */ | |
286 | if (strncmp(display, "localhost:", 10) == 0) { | |
287 | snprintf(xdisplay, sizeof(xdisplay), "unix:%s", | |
288 | display + 10); | |
289 | display = xdisplay; | |
290 | } | |
291 | if (trusted == 0) { | |
292 | xauthdir = xmalloc(MAXPATHLEN); | |
293 | xauthfile = xmalloc(MAXPATHLEN); | |
294 | strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN); | |
295 | if (mkdtemp(xauthdir) != NULL) { | |
296 | do_unlink = 1; | |
297 | snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile", | |
298 | xauthdir); | |
299 | snprintf(cmd, sizeof(cmd), | |
300 | "%s -f %s generate %s " SSH_X11_PROTO | |
301 | " untrusted timeout 1200 2>" _PATH_DEVNULL, | |
302 | xauth_path, xauthfile, display); | |
303 | debug2("x11_get_proto: %s", cmd); | |
304 | if (system(cmd) == 0) | |
305 | generated = 1; | |
306 | } | |
307 | } | |
d4487008 | 308 | |
309 | /* | |
310 | * When in untrusted mode, we read the cookie only if it was | |
311 | * successfully generated as an untrusted one in the step | |
312 | * above. | |
313 | */ | |
314 | if (trusted || generated) { | |
315 | snprintf(cmd, sizeof(cmd), | |
316 | "%s %s%s list %s 2>" _PATH_DEVNULL, | |
317 | xauth_path, | |
318 | generated ? "-f " : "" , | |
319 | generated ? xauthfile : "", | |
320 | display); | |
321 | debug2("x11_get_proto: %s", cmd); | |
322 | f = popen(cmd, "r"); | |
323 | if (f && fgets(line, sizeof(line), f) && | |
324 | sscanf(line, "%*s %511s %511s", proto, data) == 2) | |
325 | got_data = 1; | |
326 | if (f) | |
327 | pclose(f); | |
328 | } else | |
329 | error("Warning: untrusted X11 forwarding setup failed: " | |
330 | "xauth key data not generated"); | |
665a873d | 331 | } |
332 | ||
333 | if (do_unlink) { | |
334 | unlink(xauthfile); | |
335 | rmdir(xauthdir); | |
336 | } | |
337 | if (xauthdir) | |
338 | xfree(xauthdir); | |
339 | if (xauthfile) | |
340 | xfree(xauthfile); | |
341 | ||
342 | /* | |
343 | * If we didn't get authentication data, just make up some | |
344 | * data. The forwarding code will check the validity of the | |
345 | * response anyway, and substitute this data. The X11 | |
346 | * server, however, will ignore this fake data and use | |
347 | * whatever authentication mechanisms it was using otherwise | |
348 | * for the local connection. | |
349 | */ | |
350 | if (!got_data) { | |
351 | u_int32_t rnd = 0; | |
352 | ||
353 | logit("Warning: No xauth data; " | |
354 | "using fake authentication data for X11 forwarding."); | |
355 | strlcpy(proto, SSH_X11_PROTO, sizeof proto); | |
356 | for (i = 0; i < 16; i++) { | |
357 | if (i % 4 == 0) | |
358 | rnd = arc4random(); | |
359 | snprintf(data + 2 * i, sizeof data - 2 * i, "%02x", | |
360 | rnd & 0xff); | |
361 | rnd >>= 8; | |
362 | } | |
363 | } | |
364 | } | |
365 | ||
3c0ef626 | 366 | /* |
367 | * This is called when the interactive is entered. This checks if there is | |
368 | * an EOF coming on stdin. We must check this explicitly, as select() does | |
369 | * not appear to wake up when redirecting from /dev/null. | |
370 | */ | |
371 | ||
372 | static void | |
373 | client_check_initial_eof_on_stdin(void) | |
374 | { | |
375 | int len; | |
376 | char buf[1]; | |
377 | ||
378 | /* | |
379 | * If standard input is to be "redirected from /dev/null", we simply | |
380 | * mark that we have seen an EOF and send an EOF message to the | |
381 | * server. Otherwise, we try to read a single character; it appears | |
382 | * that for some files, such /dev/null, select() never wakes up for | |
383 | * read for this descriptor, which means that we never get EOF. This | |
384 | * way we will get the EOF if stdin comes from /dev/null or similar. | |
385 | */ | |
386 | if (stdin_null_flag) { | |
387 | /* Fake EOF on stdin. */ | |
388 | debug("Sending eof."); | |
389 | stdin_eof = 1; | |
390 | packet_start(SSH_CMSG_EOF); | |
391 | packet_send(); | |
392 | } else { | |
393 | enter_non_blocking(); | |
394 | ||
395 | /* Check for immediate EOF on stdin. */ | |
396 | len = read(fileno(stdin), buf, 1); | |
397 | if (len == 0) { | |
22616013 | 398 | /* |
399 | * EOF. Record that we have seen it and send | |
400 | * EOF to server. | |
401 | */ | |
3c0ef626 | 402 | debug("Sending eof."); |
403 | stdin_eof = 1; | |
404 | packet_start(SSH_CMSG_EOF); | |
405 | packet_send(); | |
406 | } else if (len > 0) { | |
407 | /* | |
408 | * Got data. We must store the data in the buffer, | |
409 | * and also process it as an escape character if | |
410 | * appropriate. | |
411 | */ | |
22616013 | 412 | if ((u_char) buf[0] == escape_char1) |
413 | escape_pending1 = 1; | |
3c0ef626 | 414 | else |
415 | buffer_append(&stdin_buffer, buf, 1); | |
416 | } | |
417 | leave_non_blocking(); | |
418 | } | |
419 | } | |
420 | ||
421 | ||
422 | /* | |
423 | * Make packets from buffered stdin data, and buffer them for sending to the | |
424 | * connection. | |
425 | */ | |
426 | ||
427 | static void | |
428 | client_make_packets_from_stdin_data(void) | |
429 | { | |
430 | u_int len; | |
431 | ||
432 | /* Send buffered stdin data to the server. */ | |
433 | while (buffer_len(&stdin_buffer) > 0 && | |
e9a17296 | 434 | packet_not_very_much_data_to_write()) { |
3c0ef626 | 435 | len = buffer_len(&stdin_buffer); |
436 | /* Keep the packets at reasonable size. */ | |
437 | if (len > packet_get_maxsize()) | |
438 | len = packet_get_maxsize(); | |
439 | packet_start(SSH_CMSG_STDIN_DATA); | |
440 | packet_put_string(buffer_ptr(&stdin_buffer), len); | |
441 | packet_send(); | |
442 | buffer_consume(&stdin_buffer, len); | |
3c0ef626 | 443 | /* If we have a pending EOF, send it now. */ |
444 | if (stdin_eof && buffer_len(&stdin_buffer) == 0) { | |
445 | packet_start(SSH_CMSG_EOF); | |
446 | packet_send(); | |
447 | } | |
448 | } | |
449 | } | |
450 | ||
451 | /* | |
452 | * Checks if the client window has changed, and sends a packet about it to | |
453 | * the server if so. The actual change is detected elsewhere (by a software | |
454 | * interrupt on Unix); this just checks the flag and sends a message if | |
455 | * appropriate. | |
456 | */ | |
457 | ||
458 | static void | |
459 | client_check_window_change(void) | |
460 | { | |
461 | struct winsize ws; | |
462 | ||
463 | if (! received_window_change_signal) | |
464 | return; | |
465 | /** XXX race */ | |
466 | received_window_change_signal = 0; | |
467 | ||
3c0ef626 | 468 | debug2("client_check_window_change: changed"); |
469 | ||
470 | if (compat20) { | |
c9f39d2c | 471 | channel_send_window_changes(); |
3c0ef626 | 472 | } else { |
c9f39d2c | 473 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) |
474 | return; | |
3c0ef626 | 475 | packet_start(SSH_CMSG_WINDOW_SIZE); |
9108f8d9 | 476 | packet_put_int((u_int)ws.ws_row); |
477 | packet_put_int((u_int)ws.ws_col); | |
478 | packet_put_int((u_int)ws.ws_xpixel); | |
479 | packet_put_int((u_int)ws.ws_ypixel); | |
3c0ef626 | 480 | packet_send(); |
481 | } | |
482 | } | |
483 | ||
cdd66111 | 484 | static void |
485 | client_global_request_reply(int type, u_int32_t seq, void *ctxt) | |
486 | { | |
22616013 | 487 | struct global_confirm *gc; |
488 | ||
489 | if ((gc = TAILQ_FIRST(&global_confirms)) == NULL) | |
490 | return; | |
491 | if (gc->cb != NULL) | |
492 | gc->cb(type, seq, gc->ctx); | |
493 | if (--gc->ref_count <= 0) { | |
494 | TAILQ_REMOVE(&global_confirms, gc, entry); | |
495 | bzero(gc, sizeof(*gc)); | |
496 | xfree(gc); | |
497 | } | |
498 | ||
b5afdff5 | 499 | packet_set_alive_timeouts(0); |
cdd66111 | 500 | } |
501 | ||
502 | static void | |
503 | server_alive_check(void) | |
504 | { | |
b5afdff5 | 505 | if (packet_inc_alive_timeouts() > options.server_alive_count_max) { |
ff7ec503 | 506 | logit("Timeout, server not responding."); |
507 | cleanup_exit(255); | |
508 | } | |
cdd66111 | 509 | packet_start(SSH2_MSG_GLOBAL_REQUEST); |
510 | packet_put_cstring("keepalive@openssh.com"); | |
511 | packet_put_char(1); /* boolean: want reply */ | |
512 | packet_send(); | |
22616013 | 513 | /* Insert an empty placeholder to maintain ordering */ |
514 | client_register_global_confirm(NULL, NULL); | |
cdd66111 | 515 | } |
516 | ||
3c0ef626 | 517 | /* |
518 | * Waits until the client can do something (some data becomes available on | |
519 | * one of the file descriptors). | |
520 | */ | |
3c0ef626 | 521 | static void |
522 | client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp, | |
c9f39d2c | 523 | int *maxfdp, u_int *nallocp, int rekeying) |
3c0ef626 | 524 | { |
cdd66111 | 525 | struct timeval tv, *tvp; |
526 | int ret; | |
527 | ||
3c0ef626 | 528 | /* Add any selections by the channel mechanism. */ |
529 | channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying); | |
530 | ||
531 | if (!compat20) { | |
532 | /* Read from the connection, unless our buffers are full. */ | |
533 | if (buffer_len(&stdout_buffer) < buffer_high && | |
534 | buffer_len(&stderr_buffer) < buffer_high && | |
535 | channel_not_very_much_buffered_data()) | |
536 | FD_SET(connection_in, *readsetp); | |
537 | /* | |
538 | * Read from stdin, unless we have seen EOF or have very much | |
539 | * buffered data to send to the server. | |
540 | */ | |
541 | if (!stdin_eof && packet_not_very_much_data_to_write()) | |
542 | FD_SET(fileno(stdin), *readsetp); | |
543 | ||
544 | /* Select stdout/stderr if have data in buffer. */ | |
545 | if (buffer_len(&stdout_buffer) > 0) | |
546 | FD_SET(fileno(stdout), *writesetp); | |
547 | if (buffer_len(&stderr_buffer) > 0) | |
548 | FD_SET(fileno(stderr), *writesetp); | |
549 | } else { | |
550 | /* channel_prepare_select could have closed the last channel */ | |
551 | if (session_closed && !channel_still_open() && | |
552 | !packet_have_data_to_write()) { | |
553 | /* clear mask since we did not call select() */ | |
554 | memset(*readsetp, 0, *nallocp); | |
555 | memset(*writesetp, 0, *nallocp); | |
556 | return; | |
557 | } else { | |
558 | FD_SET(connection_in, *readsetp); | |
559 | } | |
560 | } | |
561 | ||
562 | /* Select server connection if have data to write to the server. */ | |
563 | if (packet_have_data_to_write()) | |
564 | FD_SET(connection_out, *writesetp); | |
565 | ||
22616013 | 566 | if (muxserver_sock != -1) |
567 | FD_SET(muxserver_sock, *readsetp); | |
c9f39d2c | 568 | |
3c0ef626 | 569 | /* |
570 | * Wait for something to happen. This will suspend the process until | |
571 | * some selected descriptor can be read, written, or has some other | |
cdd66111 | 572 | * event pending. |
3c0ef626 | 573 | */ |
574 | ||
cdd66111 | 575 | if (options.server_alive_interval == 0 || !compat20) |
576 | tvp = NULL; | |
c9f39d2c | 577 | else { |
cdd66111 | 578 | tv.tv_sec = options.server_alive_interval; |
579 | tv.tv_usec = 0; | |
580 | tvp = &tv; | |
581 | } | |
582 | ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp); | |
583 | if (ret < 0) { | |
3c0ef626 | 584 | char buf[100]; |
585 | ||
586 | /* | |
587 | * We have to clear the select masks, because we return. | |
588 | * We have to return, because the mainloop checks for the flags | |
589 | * set by the signal handlers. | |
590 | */ | |
591 | memset(*readsetp, 0, *nallocp); | |
592 | memset(*writesetp, 0, *nallocp); | |
593 | ||
594 | if (errno == EINTR) | |
595 | return; | |
596 | /* Note: we might still have data in the buffers. */ | |
597 | snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno)); | |
598 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
599 | quit_pending = 1; | |
cdd66111 | 600 | } else if (ret == 0) |
601 | server_alive_check(); | |
3c0ef626 | 602 | } |
603 | ||
604 | static void | |
605 | client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr) | |
606 | { | |
3c0ef626 | 607 | /* Flush stdout and stderr buffers. */ |
608 | if (buffer_len(bout) > 0) | |
22616013 | 609 | atomicio(vwrite, fileno(stdout), buffer_ptr(bout), |
610 | buffer_len(bout)); | |
3c0ef626 | 611 | if (buffer_len(berr) > 0) |
22616013 | 612 | atomicio(vwrite, fileno(stderr), buffer_ptr(berr), |
613 | buffer_len(berr)); | |
3c0ef626 | 614 | |
615 | leave_raw_mode(); | |
616 | ||
617 | /* | |
618 | * Free (and clear) the buffer to reduce the amount of data that gets | |
619 | * written to swap. | |
620 | */ | |
621 | buffer_free(bin); | |
622 | buffer_free(bout); | |
623 | buffer_free(berr); | |
624 | ||
3c0ef626 | 625 | /* Send the suspend signal to the program itself. */ |
626 | kill(getpid(), SIGTSTP); | |
627 | ||
996d5e62 | 628 | /* Reset window sizes in case they have changed */ |
629 | received_window_change_signal = 1; | |
3c0ef626 | 630 | |
631 | /* OK, we have been continued by the user. Reinitialize buffers. */ | |
632 | buffer_init(bin); | |
633 | buffer_init(bout); | |
634 | buffer_init(berr); | |
635 | ||
636 | enter_raw_mode(); | |
637 | } | |
638 | ||
639 | static void | |
9108f8d9 | 640 | client_process_net_input(fd_set *readset) |
3c0ef626 | 641 | { |
b5afdff5 | 642 | int len, cont = 0; |
643 | char buf[SSH_IOBUFSZ]; | |
3c0ef626 | 644 | |
645 | /* | |
646 | * Read input from the server, and add any such data to the buffer of | |
647 | * the packet subsystem. | |
648 | */ | |
649 | if (FD_ISSET(connection_in, readset)) { | |
650 | /* Read as much as possible. */ | |
b5afdff5 | 651 | len = roaming_read(connection_in, buf, sizeof(buf), &cont); |
652 | if (len == 0 && cont == 0) { | |
22616013 | 653 | /* |
654 | * Received EOF. The remote host has closed the | |
655 | * connection. | |
656 | */ | |
657 | snprintf(buf, sizeof buf, | |
658 | "Connection to %.300s closed by remote host.\r\n", | |
659 | host); | |
3c0ef626 | 660 | buffer_append(&stderr_buffer, buf, strlen(buf)); |
661 | quit_pending = 1; | |
662 | return; | |
663 | } | |
664 | /* | |
665 | * There is a kernel bug on Solaris that causes select to | |
666 | * sometimes wake up even though there is no data available. | |
667 | */ | |
22616013 | 668 | if (len < 0 && |
669 | (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK)) | |
3c0ef626 | 670 | len = 0; |
671 | ||
672 | if (len < 0) { | |
22616013 | 673 | /* |
674 | * An error has encountered. Perhaps there is a | |
675 | * network problem. | |
676 | */ | |
677 | snprintf(buf, sizeof buf, | |
678 | "Read from remote host %.300s: %.100s\r\n", | |
679 | host, strerror(errno)); | |
3c0ef626 | 680 | buffer_append(&stderr_buffer, buf, strlen(buf)); |
681 | quit_pending = 1; | |
682 | return; | |
683 | } | |
684 | packet_process_incoming(buf, len); | |
685 | } | |
686 | } | |
687 | ||
c9f39d2c | 688 | static void |
22616013 | 689 | client_status_confirm(int type, Channel *c, void *ctx) |
c9f39d2c | 690 | { |
22616013 | 691 | struct channel_reply_ctx *cr = (struct channel_reply_ctx *)ctx; |
692 | char errmsg[256]; | |
693 | int tochan; | |
694 | ||
695 | /* XXX supress on mux _client_ quietmode */ | |
696 | tochan = options.log_level >= SYSLOG_LEVEL_ERROR && | |
697 | c->ctl_fd != -1 && c->extended_usage == CHAN_EXTENDED_WRITE; | |
698 | ||
699 | if (type == SSH2_MSG_CHANNEL_SUCCESS) { | |
700 | debug2("%s request accepted on channel %d", | |
701 | cr->request_type, c->self); | |
702 | } else if (type == SSH2_MSG_CHANNEL_FAILURE) { | |
703 | if (tochan) { | |
704 | snprintf(errmsg, sizeof(errmsg), | |
705 | "%s request failed\r\n", cr->request_type); | |
706 | } else { | |
707 | snprintf(errmsg, sizeof(errmsg), | |
708 | "%s request failed on channel %d", | |
709 | cr->request_type, c->self); | |
710 | } | |
711 | /* If error occurred on primary session channel, then exit */ | |
712 | if (cr->do_close && c->self == session_ident) | |
713 | fatal("%s", errmsg); | |
714 | /* If error occurred on mux client, append to their stderr */ | |
715 | if (tochan) | |
716 | buffer_append(&c->extended, errmsg, strlen(errmsg)); | |
717 | else | |
718 | error("%s", errmsg); | |
719 | if (cr->do_close) { | |
720 | chan_read_failed(c); | |
721 | chan_write_failed(c); | |
722 | } | |
c9f39d2c | 723 | } |
22616013 | 724 | xfree(cr); |
c9f39d2c | 725 | } |
726 | ||
727 | static void | |
22616013 | 728 | client_abandon_status_confirm(Channel *c, void *ctx) |
c9f39d2c | 729 | { |
22616013 | 730 | xfree(ctx); |
c9f39d2c | 731 | } |
732 | ||
733 | static void | |
22616013 | 734 | client_expect_confirm(int id, const char *request, int do_close) |
c9f39d2c | 735 | { |
22616013 | 736 | struct channel_reply_ctx *cr = xmalloc(sizeof(*cr)); |
c9f39d2c | 737 | |
22616013 | 738 | cr->request_type = request; |
739 | cr->do_close = do_close; | |
c9f39d2c | 740 | |
22616013 | 741 | channel_register_status_confirm(id, client_status_confirm, |
742 | client_abandon_status_confirm, cr); | |
743 | } | |
c9f39d2c | 744 | |
22616013 | 745 | void |
746 | client_register_global_confirm(global_confirm_cb *cb, void *ctx) | |
747 | { | |
748 | struct global_confirm *gc, *last_gc; | |
749 | ||
750 | /* Coalesce identical callbacks */ | |
751 | last_gc = TAILQ_LAST(&global_confirms, global_confirms); | |
752 | if (last_gc && last_gc->cb == cb && last_gc->ctx == ctx) { | |
753 | if (++last_gc->ref_count >= INT_MAX) | |
754 | fatal("%s: last_gc->ref_count = %d", | |
755 | __func__, last_gc->ref_count); | |
c9f39d2c | 756 | return; |
757 | } | |
c9f39d2c | 758 | |
22616013 | 759 | gc = xmalloc(sizeof(*gc)); |
760 | gc->cb = cb; | |
761 | gc->ctx = ctx; | |
762 | gc->ref_count = 1; | |
763 | TAILQ_INSERT_TAIL(&global_confirms, gc, entry); | |
c9f39d2c | 764 | } |
765 | ||
700318f3 | 766 | static void |
767 | process_cmdline(void) | |
768 | { | |
769 | void (*handler)(int); | |
996d5e62 | 770 | char *s, *cmd, *cancel_host; |
c9f39d2c | 771 | int delete = 0; |
91d9cdd3 | 772 | int local = 0, remote = 0, dynamic = 0; |
773 | int cancel_port; | |
996d5e62 | 774 | Forward fwd; |
700318f3 | 775 | |
47686178 | 776 | bzero(&fwd, sizeof(fwd)); |
777 | fwd.listen_host = fwd.connect_host = NULL; | |
778 | ||
700318f3 | 779 | leave_raw_mode(); |
f5799ae1 | 780 | handler = signal(SIGINT, SIG_IGN); |
700318f3 | 781 | cmd = s = read_passphrase("\r\nssh> ", RP_ECHO); |
782 | if (s == NULL) | |
783 | goto out; | |
d4487008 | 784 | while (isspace(*s)) |
700318f3 | 785 | s++; |
c9f39d2c | 786 | if (*s == '-') |
787 | s++; /* Skip cmdline '-', if any */ | |
788 | if (*s == '\0') | |
789 | goto out; | |
790 | ||
791 | if (*s == 'h' || *s == 'H' || *s == '?') { | |
792 | logit("Commands:"); | |
9108f8d9 | 793 | logit(" -L[bind_address:]port:host:hostport " |
794 | "Request local forward"); | |
795 | logit(" -R[bind_address:]port:host:hostport " | |
796 | "Request remote forward"); | |
91d9cdd3 | 797 | logit(" -D[bind_address:]port " |
798 | "Request dynamic forward"); | |
9108f8d9 | 799 | logit(" -KR[bind_address:]port " |
800 | "Cancel remote forward"); | |
2c06c99b | 801 | if (!options.permit_local_command) |
802 | goto out; | |
9108f8d9 | 803 | logit(" !args " |
804 | "Execute local command"); | |
2c06c99b | 805 | goto out; |
806 | } | |
807 | ||
808 | if (*s == '!' && options.permit_local_command) { | |
809 | s++; | |
810 | ssh_local_cmd(s); | |
700318f3 | 811 | goto out; |
c9f39d2c | 812 | } |
813 | ||
814 | if (*s == 'K') { | |
815 | delete = 1; | |
816 | s++; | |
817 | } | |
91d9cdd3 | 818 | if (*s == 'L') |
819 | local = 1; | |
820 | else if (*s == 'R') | |
821 | remote = 1; | |
822 | else if (*s == 'D') | |
823 | dynamic = 1; | |
824 | else { | |
0fff78ff | 825 | logit("Invalid command."); |
700318f3 | 826 | goto out; |
827 | } | |
91d9cdd3 | 828 | |
829 | if ((local || dynamic) && delete) { | |
c9f39d2c | 830 | logit("Not supported."); |
831 | goto out; | |
832 | } | |
91d9cdd3 | 833 | if (remote && delete && !compat20) { |
0fff78ff | 834 | logit("Not supported for SSH protocol version 1."); |
700318f3 | 835 | goto out; |
836 | } | |
c9f39d2c | 837 | |
d4487008 | 838 | while (isspace(*++s)) |
839 | ; | |
700318f3 | 840 | |
c9f39d2c | 841 | if (delete) { |
996d5e62 | 842 | cancel_port = 0; |
843 | cancel_host = hpdelim(&s); /* may be NULL */ | |
844 | if (s != NULL) { | |
845 | cancel_port = a2port(s); | |
846 | cancel_host = cleanhostname(cancel_host); | |
847 | } else { | |
848 | cancel_port = a2port(cancel_host); | |
849 | cancel_host = NULL; | |
c9f39d2c | 850 | } |
91d9cdd3 | 851 | if (cancel_port <= 0) { |
996d5e62 | 852 | logit("Bad forwarding close port"); |
c9f39d2c | 853 | goto out; |
854 | } | |
996d5e62 | 855 | channel_request_rforward_cancel(cancel_host, cancel_port); |
c9f39d2c | 856 | } else { |
91d9cdd3 | 857 | if (!parse_forward(&fwd, s, dynamic, remote)) { |
c9f39d2c | 858 | logit("Bad forwarding specification."); |
859 | goto out; | |
860 | } | |
91d9cdd3 | 861 | if (local || dynamic) { |
996d5e62 | 862 | if (channel_setup_local_fwd_listener(fwd.listen_host, |
863 | fwd.listen_port, fwd.connect_host, | |
864 | fwd.connect_port, options.gateway_ports) < 0) { | |
c9f39d2c | 865 | logit("Port forwarding failed."); |
866 | goto out; | |
867 | } | |
996d5e62 | 868 | } else { |
9108f8d9 | 869 | if (channel_request_remote_forwarding(fwd.listen_host, |
996d5e62 | 870 | fwd.listen_port, fwd.connect_host, |
9108f8d9 | 871 | fwd.connect_port) < 0) { |
872 | logit("Port forwarding failed."); | |
873 | goto out; | |
874 | } | |
996d5e62 | 875 | } |
876 | ||
c9f39d2c | 877 | logit("Forwarding port."); |
878 | } | |
879 | ||
700318f3 | 880 | out: |
881 | signal(SIGINT, handler); | |
882 | enter_raw_mode(); | |
883 | if (cmd) | |
884 | xfree(cmd); | |
47686178 | 885 | if (fwd.listen_host != NULL) |
886 | xfree(fwd.listen_host); | |
887 | if (fwd.connect_host != NULL) | |
888 | xfree(fwd.connect_host); | |
700318f3 | 889 | } |
890 | ||
22616013 | 891 | /* |
892 | * Process the characters one by one, call with c==NULL for proto1 case. | |
893 | */ | |
3c0ef626 | 894 | static int |
22616013 | 895 | process_escapes(Channel *c, Buffer *bin, Buffer *bout, Buffer *berr, |
896 | char *buf, int len) | |
3c0ef626 | 897 | { |
898 | char string[1024]; | |
899 | pid_t pid; | |
900 | int bytes = 0; | |
901 | u_int i; | |
902 | u_char ch; | |
903 | char *s; | |
22616013 | 904 | int *escape_pendingp, escape_char; |
905 | struct escape_filter_ctx *efc; | |
3c0ef626 | 906 | |
22616013 | 907 | if (c == NULL) { |
908 | escape_pendingp = &escape_pending1; | |
909 | escape_char = escape_char1; | |
910 | } else { | |
911 | if (c->filter_ctx == NULL) | |
912 | return 0; | |
913 | efc = (struct escape_filter_ctx *)c->filter_ctx; | |
914 | escape_pendingp = &efc->escape_pending; | |
915 | escape_char = efc->escape_char; | |
916 | } | |
917 | ||
665a873d | 918 | if (len <= 0) |
919 | return (0); | |
920 | ||
921 | for (i = 0; i < (u_int)len; i++) { | |
3c0ef626 | 922 | /* Get one character at a time. */ |
923 | ch = buf[i]; | |
924 | ||
22616013 | 925 | if (*escape_pendingp) { |
3c0ef626 | 926 | /* We have previously seen an escape character. */ |
927 | /* Clear the flag now. */ | |
22616013 | 928 | *escape_pendingp = 0; |
3c0ef626 | 929 | |
930 | /* Process the escaped character. */ | |
931 | switch (ch) { | |
932 | case '.': | |
933 | /* Terminate the connection. */ | |
22616013 | 934 | snprintf(string, sizeof string, "%c.\r\n", |
935 | escape_char); | |
3c0ef626 | 936 | buffer_append(berr, string, strlen(string)); |
937 | ||
22616013 | 938 | if (c && c->ctl_fd != -1) { |
939 | chan_read_failed(c); | |
940 | chan_write_failed(c); | |
941 | return 0; | |
942 | } else | |
943 | quit_pending = 1; | |
3c0ef626 | 944 | return -1; |
945 | ||
946 | case 'Z' - 64: | |
22616013 | 947 | /* XXX support this for mux clients */ |
948 | if (c && c->ctl_fd != -1) { | |
949 | noescape: | |
950 | snprintf(string, sizeof string, | |
951 | "%c%c escape not available to " | |
952 | "multiplexed sessions\r\n", | |
953 | escape_char, ch); | |
954 | buffer_append(berr, string, | |
955 | strlen(string)); | |
956 | continue; | |
957 | } | |
958 | /* Suspend the program. Inform the user */ | |
959 | snprintf(string, sizeof string, | |
960 | "%c^Z [suspend ssh]\r\n", escape_char); | |
3c0ef626 | 961 | buffer_append(berr, string, strlen(string)); |
962 | ||
963 | /* Restore terminal modes and suspend. */ | |
964 | client_suspend_self(bin, bout, berr); | |
965 | ||
966 | /* We have been continued. */ | |
967 | continue; | |
968 | ||
0fff78ff | 969 | case 'B': |
970 | if (compat20) { | |
971 | snprintf(string, sizeof string, | |
972 | "%cB\r\n", escape_char); | |
973 | buffer_append(berr, string, | |
974 | strlen(string)); | |
975 | channel_request_start(session_ident, | |
976 | "break", 0); | |
977 | packet_put_int(1000); | |
978 | packet_send(); | |
979 | } | |
980 | continue; | |
981 | ||
3c0ef626 | 982 | case 'R': |
983 | if (compat20) { | |
984 | if (datafellows & SSH_BUG_NOREKEY) | |
22616013 | 985 | logit("Server does not " |
986 | "support re-keying"); | |
3c0ef626 | 987 | else |
988 | need_rekeying = 1; | |
989 | } | |
990 | continue; | |
991 | ||
992 | case '&': | |
22616013 | 993 | if (c && c->ctl_fd != -1) |
994 | goto noescape; | |
3c0ef626 | 995 | /* |
22616013 | 996 | * Detach the program (continue to serve |
997 | * connections, but put in background and no | |
998 | * more new connections). | |
3c0ef626 | 999 | */ |
1000 | /* Restore tty modes. */ | |
1001 | leave_raw_mode(); | |
1002 | ||
1003 | /* Stop listening for new connections. */ | |
1004 | channel_stop_listening(); | |
1005 | ||
1006 | snprintf(string, sizeof string, | |
1007 | "%c& [backgrounded]\n", escape_char); | |
1008 | buffer_append(berr, string, strlen(string)); | |
1009 | ||
1010 | /* Fork into background. */ | |
1011 | pid = fork(); | |
1012 | if (pid < 0) { | |
1013 | error("fork: %.100s", strerror(errno)); | |
1014 | continue; | |
1015 | } | |
1016 | if (pid != 0) { /* This is the parent. */ | |
1017 | /* The parent just exits. */ | |
1018 | exit(0); | |
1019 | } | |
1020 | /* The child continues serving connections. */ | |
1021 | if (compat20) { | |
1022 | buffer_append(bin, "\004", 1); | |
1023 | /* fake EOF on stdin */ | |
1024 | return -1; | |
1025 | } else if (!stdin_eof) { | |
1026 | /* | |
22616013 | 1027 | * Sending SSH_CMSG_EOF alone does not |
1028 | * always appear to be enough. So we | |
1029 | * try to send an EOF character first. | |
3c0ef626 | 1030 | */ |
1031 | packet_start(SSH_CMSG_STDIN_DATA); | |
1032 | packet_put_string("\004", 1); | |
1033 | packet_send(); | |
1034 | /* Close stdin. */ | |
1035 | stdin_eof = 1; | |
1036 | if (buffer_len(bin) == 0) { | |
1037 | packet_start(SSH_CMSG_EOF); | |
1038 | packet_send(); | |
1039 | } | |
1040 | } | |
1041 | continue; | |
1042 | ||
1043 | case '?': | |
22616013 | 1044 | if (c && c->ctl_fd != -1) { |
1045 | snprintf(string, sizeof string, | |
1046 | "%c?\r\n\ | |
1047 | Supported escape sequences:\r\n\ | |
1048 | %c. - terminate session\r\n\ | |
1049 | %cB - send a BREAK to the remote system\r\n\ | |
22616013 | 1050 | %cR - Request rekey (SSH protocol 2 only)\r\n\ |
1051 | %c# - list forwarded connections\r\n\ | |
1052 | %c? - this message\r\n\ | |
1053 | %c%c - send the escape character by typing it twice\r\n\ | |
1054 | (Note that escapes are only recognized immediately after newline.)\r\n", | |
1055 | escape_char, escape_char, | |
1056 | escape_char, escape_char, | |
1057 | escape_char, escape_char, | |
91d9cdd3 | 1058 | escape_char, escape_char); |
22616013 | 1059 | } else { |
1060 | snprintf(string, sizeof string, | |
3c0ef626 | 1061 | "%c?\r\n\ |
1062 | Supported escape sequences:\r\n\ | |
22616013 | 1063 | %c. - terminate connection (and any multiplexed sessions)\r\n\ |
1064 | %cB - send a BREAK to the remote system\r\n\ | |
1065 | %cC - open a command line\r\n\ | |
1066 | %cR - Request rekey (SSH protocol 2 only)\r\n\ | |
1067 | %c^Z - suspend ssh\r\n\ | |
1068 | %c# - list forwarded connections\r\n\ | |
1069 | %c& - background ssh (when waiting for connections to terminate)\r\n\ | |
1070 | %c? - this message\r\n\ | |
1071 | %c%c - send the escape character by typing it twice\r\n\ | |
3c0ef626 | 1072 | (Note that escapes are only recognized immediately after newline.)\r\n", |
22616013 | 1073 | escape_char, escape_char, |
1074 | escape_char, escape_char, | |
1075 | escape_char, escape_char, | |
1076 | escape_char, escape_char, | |
1077 | escape_char, escape_char, | |
1078 | escape_char); | |
1079 | } | |
3c0ef626 | 1080 | buffer_append(berr, string, strlen(string)); |
1081 | continue; | |
1082 | ||
1083 | case '#': | |
22616013 | 1084 | snprintf(string, sizeof string, "%c#\r\n", |
1085 | escape_char); | |
3c0ef626 | 1086 | buffer_append(berr, string, strlen(string)); |
1087 | s = channel_open_message(); | |
1088 | buffer_append(berr, s, strlen(s)); | |
1089 | xfree(s); | |
1090 | continue; | |
1091 | ||
700318f3 | 1092 | case 'C': |
91d9cdd3 | 1093 | if (c && c->ctl_fd != -1) |
1094 | goto noescape; | |
700318f3 | 1095 | process_cmdline(); |
1096 | continue; | |
1097 | ||
3c0ef626 | 1098 | default: |
1099 | if (ch != escape_char) { | |
1100 | buffer_put_char(bin, escape_char); | |
1101 | bytes++; | |
1102 | } | |
1103 | /* Escaped characters fall through here */ | |
1104 | break; | |
1105 | } | |
1106 | } else { | |
1107 | /* | |
22616013 | 1108 | * The previous character was not an escape char. |
1109 | * Check if this is an escape. | |
3c0ef626 | 1110 | */ |
1111 | if (last_was_cr && ch == escape_char) { | |
22616013 | 1112 | /* |
1113 | * It is. Set the flag and continue to | |
1114 | * next character. | |
1115 | */ | |
1116 | *escape_pendingp = 1; | |
3c0ef626 | 1117 | continue; |
1118 | } | |
1119 | } | |
1120 | ||
1121 | /* | |
1122 | * Normal character. Record whether it was a newline, | |
1123 | * and append it to the buffer. | |
1124 | */ | |
1125 | last_was_cr = (ch == '\r' || ch == '\n'); | |
1126 | buffer_put_char(bin, ch); | |
1127 | bytes++; | |
1128 | } | |
1129 | return bytes; | |
1130 | } | |
1131 | ||
1132 | static void | |
9108f8d9 | 1133 | client_process_input(fd_set *readset) |
3c0ef626 | 1134 | { |
1135 | int len; | |
b5afdff5 | 1136 | char buf[SSH_IOBUFSZ]; |
3c0ef626 | 1137 | |
1138 | /* Read input from stdin. */ | |
1139 | if (FD_ISSET(fileno(stdin), readset)) { | |
1140 | /* Read as much as possible. */ | |
1141 | len = read(fileno(stdin), buf, sizeof(buf)); | |
22616013 | 1142 | if (len < 0 && |
1143 | (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK)) | |
3c0ef626 | 1144 | return; /* we'll try again later */ |
1145 | if (len <= 0) { | |
1146 | /* | |
1147 | * Received EOF or error. They are treated | |
1148 | * similarly, except that an error message is printed | |
1149 | * if it was an error condition. | |
1150 | */ | |
1151 | if (len < 0) { | |
22616013 | 1152 | snprintf(buf, sizeof buf, "read: %.100s\r\n", |
1153 | strerror(errno)); | |
3c0ef626 | 1154 | buffer_append(&stderr_buffer, buf, strlen(buf)); |
1155 | } | |
1156 | /* Mark that we have seen EOF. */ | |
1157 | stdin_eof = 1; | |
1158 | /* | |
1159 | * Send an EOF message to the server unless there is | |
1160 | * data in the buffer. If there is data in the | |
1161 | * buffer, no message will be sent now. Code | |
1162 | * elsewhere will send the EOF when the buffer | |
1163 | * becomes empty if stdin_eof is set. | |
1164 | */ | |
1165 | if (buffer_len(&stdin_buffer) == 0) { | |
1166 | packet_start(SSH_CMSG_EOF); | |
1167 | packet_send(); | |
1168 | } | |
22616013 | 1169 | } else if (escape_char1 == SSH_ESCAPECHAR_NONE) { |
3c0ef626 | 1170 | /* |
1171 | * Normal successful read, and no escape character. | |
1172 | * Just append the data to buffer. | |
1173 | */ | |
1174 | buffer_append(&stdin_buffer, buf, len); | |
1175 | } else { | |
1176 | /* | |
22616013 | 1177 | * Normal, successful read. But we have an escape |
1178 | * character and have to process the characters one | |
1179 | * by one. | |
3c0ef626 | 1180 | */ |
22616013 | 1181 | if (process_escapes(NULL, &stdin_buffer, |
1182 | &stdout_buffer, &stderr_buffer, buf, len) == -1) | |
3c0ef626 | 1183 | return; |
1184 | } | |
1185 | } | |
1186 | } | |
1187 | ||
1188 | static void | |
9108f8d9 | 1189 | client_process_output(fd_set *writeset) |
3c0ef626 | 1190 | { |
1191 | int len; | |
1192 | char buf[100]; | |
1193 | ||
1194 | /* Write buffered output to stdout. */ | |
1195 | if (FD_ISSET(fileno(stdout), writeset)) { | |
1196 | /* Write as much data as possible. */ | |
1197 | len = write(fileno(stdout), buffer_ptr(&stdout_buffer), | |
1198 | buffer_len(&stdout_buffer)); | |
1199 | if (len <= 0) { | |
22616013 | 1200 | if (errno == EINTR || errno == EAGAIN || |
1201 | errno == EWOULDBLOCK) | |
3c0ef626 | 1202 | len = 0; |
1203 | else { | |
1204 | /* | |
1205 | * An error or EOF was encountered. Put an | |
1206 | * error message to stderr buffer. | |
1207 | */ | |
22616013 | 1208 | snprintf(buf, sizeof buf, |
1209 | "write stdout: %.50s\r\n", strerror(errno)); | |
3c0ef626 | 1210 | buffer_append(&stderr_buffer, buf, strlen(buf)); |
1211 | quit_pending = 1; | |
1212 | return; | |
1213 | } | |
1214 | } | |
1215 | /* Consume printed data from the buffer. */ | |
1216 | buffer_consume(&stdout_buffer, len); | |
3c0ef626 | 1217 | } |
1218 | /* Write buffered output to stderr. */ | |
1219 | if (FD_ISSET(fileno(stderr), writeset)) { | |
1220 | /* Write as much data as possible. */ | |
1221 | len = write(fileno(stderr), buffer_ptr(&stderr_buffer), | |
1222 | buffer_len(&stderr_buffer)); | |
1223 | if (len <= 0) { | |
22616013 | 1224 | if (errno == EINTR || errno == EAGAIN || |
1225 | errno == EWOULDBLOCK) | |
3c0ef626 | 1226 | len = 0; |
1227 | else { | |
22616013 | 1228 | /* |
1229 | * EOF or error, but can't even print | |
1230 | * error message. | |
1231 | */ | |
3c0ef626 | 1232 | quit_pending = 1; |
1233 | return; | |
1234 | } | |
1235 | } | |
1236 | /* Consume printed characters from the buffer. */ | |
1237 | buffer_consume(&stderr_buffer, len); | |
3c0ef626 | 1238 | } |
1239 | } | |
1240 | ||
1241 | /* | |
1242 | * Get packets from the connection input buffer, and process them as long as | |
1243 | * there are packets available. | |
1244 | * | |
1245 | * Any unknown packets received during the actual | |
1246 | * session cause the session to terminate. This is | |
1247 | * intended to make debugging easier since no | |
1248 | * confirmations are sent. Any compatible protocol | |
1249 | * extensions must be negotiated during the | |
1250 | * preparatory phase. | |
1251 | */ | |
1252 | ||
1253 | static void | |
1254 | client_process_buffered_input_packets(void) | |
1255 | { | |
22616013 | 1256 | dispatch_run(DISPATCH_NONBLOCK, &quit_pending, |
1257 | compat20 ? xxx_kex : NULL); | |
3c0ef626 | 1258 | } |
1259 | ||
1260 | /* scan buf[] for '~' before sending data to the peer */ | |
1261 | ||
22616013 | 1262 | /* Helper: allocate a new escape_filter_ctx and fill in its escape char */ |
1263 | void * | |
1264 | client_new_escape_filter_ctx(int escape_char) | |
3c0ef626 | 1265 | { |
22616013 | 1266 | struct escape_filter_ctx *ret; |
1267 | ||
1268 | ret = xmalloc(sizeof(*ret)); | |
1269 | ret->escape_pending = 0; | |
1270 | ret->escape_char = escape_char; | |
1271 | return (void *)ret; | |
1272 | } | |
1273 | ||
1274 | /* Free the escape filter context on channel free */ | |
1275 | void | |
1276 | client_filter_cleanup(int cid, void *ctx) | |
1277 | { | |
1278 | xfree(ctx); | |
1279 | } | |
1280 | ||
1281 | int | |
1282 | client_simple_escape_filter(Channel *c, char *buf, int len) | |
1283 | { | |
1284 | if (c->extended_usage != CHAN_EXTENDED_WRITE) | |
1285 | return 0; | |
1286 | ||
1287 | return process_escapes(c, &c->input, &c->output, &c->extended, | |
1288 | buf, len); | |
3c0ef626 | 1289 | } |
1290 | ||
1291 | static void | |
1292 | client_channel_closed(int id, void *arg) | |
1293 | { | |
3c0ef626 | 1294 | channel_cancel_cleanup(id); |
1295 | session_closed = 1; | |
cdd66111 | 1296 | leave_raw_mode(); |
3c0ef626 | 1297 | } |
1298 | ||
1299 | /* | |
1300 | * Implements the interactive session with the server. This is called after | |
1301 | * the user has been authenticated, and a command has been started on the | |
1302 | * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character | |
1303 | * used as an escape character for terminating or suspending the session. | |
1304 | */ | |
1305 | ||
1306 | int | |
1307 | client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id) | |
1308 | { | |
1309 | fd_set *readset = NULL, *writeset = NULL; | |
1310 | double start_time, total_time; | |
c9f39d2c | 1311 | int max_fd = 0, max_fd2 = 0, len, rekeying = 0; |
22616013 | 1312 | u_int64_t ibytes, obytes; |
c9f39d2c | 1313 | u_int nalloc = 0; |
3c0ef626 | 1314 | char buf[100]; |
1315 | ||
1316 | debug("Entering interactive session."); | |
1317 | ||
1318 | start_time = get_current_time(); | |
1319 | ||
1320 | /* Initialize variables. */ | |
22616013 | 1321 | escape_pending1 = 0; |
3c0ef626 | 1322 | last_was_cr = 1; |
1323 | exit_status = -1; | |
1324 | stdin_eof = 0; | |
1325 | buffer_high = 64 * 1024; | |
1326 | connection_in = packet_get_connection_in(); | |
1327 | connection_out = packet_get_connection_out(); | |
1328 | max_fd = MAX(connection_in, connection_out); | |
22616013 | 1329 | if (muxserver_sock != -1) |
1330 | max_fd = MAX(max_fd, muxserver_sock); | |
3c0ef626 | 1331 | |
1332 | if (!compat20) { | |
1333 | /* enable nonblocking unless tty */ | |
1334 | if (!isatty(fileno(stdin))) | |
1335 | set_nonblock(fileno(stdin)); | |
1336 | if (!isatty(fileno(stdout))) | |
1337 | set_nonblock(fileno(stdout)); | |
1338 | if (!isatty(fileno(stderr))) | |
1339 | set_nonblock(fileno(stderr)); | |
1340 | max_fd = MAX(max_fd, fileno(stdin)); | |
1341 | max_fd = MAX(max_fd, fileno(stdout)); | |
1342 | max_fd = MAX(max_fd, fileno(stderr)); | |
1343 | } | |
3c0ef626 | 1344 | quit_pending = 0; |
22616013 | 1345 | escape_char1 = escape_char_arg; |
3c0ef626 | 1346 | |
1347 | /* Initialize buffers. */ | |
1348 | buffer_init(&stdin_buffer); | |
1349 | buffer_init(&stdout_buffer); | |
1350 | buffer_init(&stderr_buffer); | |
1351 | ||
1352 | client_init_dispatch(); | |
1353 | ||
6a9b3198 | 1354 | /* |
1355 | * Set signal handlers, (e.g. to restore non-blocking mode) | |
1356 | * but don't overwrite SIG_IGN, matches behaviour from rsh(1) | |
1357 | */ | |
996d5e62 | 1358 | if (signal(SIGHUP, SIG_IGN) != SIG_IGN) |
1359 | signal(SIGHUP, signal_handler); | |
6a9b3198 | 1360 | if (signal(SIGINT, SIG_IGN) != SIG_IGN) |
1361 | signal(SIGINT, signal_handler); | |
1362 | if (signal(SIGQUIT, SIG_IGN) != SIG_IGN) | |
1363 | signal(SIGQUIT, signal_handler); | |
1364 | if (signal(SIGTERM, SIG_IGN) != SIG_IGN) | |
1365 | signal(SIGTERM, signal_handler); | |
996d5e62 | 1366 | signal(SIGWINCH, window_change_handler); |
3c0ef626 | 1367 | |
1368 | if (have_pty) | |
1369 | enter_raw_mode(); | |
1370 | ||
1371 | if (compat20) { | |
1372 | session_ident = ssh2_chan_id; | |
22616013 | 1373 | if (escape_char_arg != SSH_ESCAPECHAR_NONE) |
3c0ef626 | 1374 | channel_register_filter(session_ident, |
22616013 | 1375 | client_simple_escape_filter, NULL, |
1376 | client_filter_cleanup, | |
1377 | client_new_escape_filter_ctx(escape_char_arg)); | |
3c0ef626 | 1378 | if (session_ident != -1) |
1379 | channel_register_cleanup(session_ident, | |
2c06c99b | 1380 | client_channel_closed, 0); |
3c0ef626 | 1381 | } else { |
1382 | /* Check if we should immediately send eof on stdin. */ | |
1383 | client_check_initial_eof_on_stdin(); | |
1384 | } | |
1385 | ||
1386 | /* Main loop of the client for the interactive session mode. */ | |
1387 | while (!quit_pending) { | |
1388 | ||
1389 | /* Process buffered packets sent by the server. */ | |
1390 | client_process_buffered_input_packets(); | |
1391 | ||
1392 | if (compat20 && session_closed && !channel_still_open()) | |
1393 | break; | |
1394 | ||
1395 | rekeying = (xxx_kex != NULL && !xxx_kex->done); | |
1396 | ||
1397 | if (rekeying) { | |
1398 | debug("rekeying in progress"); | |
1399 | } else { | |
1400 | /* | |
1401 | * Make packets of buffered stdin data, and buffer | |
1402 | * them for sending to the server. | |
1403 | */ | |
1404 | if (!compat20) | |
1405 | client_make_packets_from_stdin_data(); | |
1406 | ||
1407 | /* | |
1408 | * Make packets from buffered channel data, and | |
1409 | * enqueue them for sending to the server. | |
1410 | */ | |
1411 | if (packet_not_very_much_data_to_write()) | |
1412 | channel_output_poll(); | |
1413 | ||
1414 | /* | |
1415 | * Check if the window size has changed, and buffer a | |
1416 | * message about it to the server if so. | |
1417 | */ | |
1418 | client_check_window_change(); | |
1419 | ||
1420 | if (quit_pending) | |
1421 | break; | |
1422 | } | |
1423 | /* | |
1424 | * Wait until we have something to do (something becomes | |
1425 | * available on one of the descriptors). | |
1426 | */ | |
1427 | max_fd2 = max_fd; | |
1428 | client_wait_until_can_do_something(&readset, &writeset, | |
1429 | &max_fd2, &nalloc, rekeying); | |
1430 | ||
1431 | if (quit_pending) | |
1432 | break; | |
1433 | ||
1434 | /* Do channel operations unless rekeying in progress. */ | |
1435 | if (!rekeying) { | |
1436 | channel_after_select(readset, writeset); | |
f97edba6 | 1437 | |
071d8001 | 1438 | #ifdef GSSAPI |
f97edba6 | 1439 | if (options.gss_renewal_rekey && |
db5d66a5 | 1440 | ssh_gssapi_credentials_updated((Gssctxt *)GSS_C_NO_CONTEXT)) { |
f97edba6 | 1441 | debug("credentials updated - forcing rekey"); |
1442 | need_rekeying = 1; | |
1443 | } | |
071d8001 | 1444 | #endif |
f97edba6 | 1445 | |
0fff78ff | 1446 | if (need_rekeying || packet_need_rekeying()) { |
1447 | debug("need rekeying"); | |
3c0ef626 | 1448 | xxx_kex->done = 0; |
1449 | kex_send_kexinit(xxx_kex); | |
1450 | need_rekeying = 0; | |
1451 | } | |
1452 | } | |
1453 | ||
1454 | /* Buffer input from the connection. */ | |
1455 | client_process_net_input(readset); | |
1456 | ||
c9f39d2c | 1457 | /* Accept control connections. */ |
22616013 | 1458 | if (muxserver_sock != -1 &&FD_ISSET(muxserver_sock, readset)) { |
1459 | if (muxserver_accept_control()) | |
1460 | quit_pending = 1; | |
1461 | } | |
c9f39d2c | 1462 | |
3c0ef626 | 1463 | if (quit_pending) |
1464 | break; | |
1465 | ||
1466 | if (!compat20) { | |
1467 | /* Buffer data from stdin */ | |
1468 | client_process_input(readset); | |
1469 | /* | |
1470 | * Process output to stdout and stderr. Output to | |
1471 | * the connection is processed elsewhere (above). | |
1472 | */ | |
1473 | client_process_output(writeset); | |
1474 | } | |
1475 | ||
22616013 | 1476 | /* |
1477 | * Send as much buffered packet data as possible to the | |
1478 | * sender. | |
1479 | */ | |
3c0ef626 | 1480 | if (FD_ISSET(connection_out, writeset)) |
1481 | packet_write_poll(); | |
1482 | } | |
1483 | if (readset) | |
1484 | xfree(readset); | |
1485 | if (writeset) | |
1486 | xfree(writeset); | |
1487 | ||
1488 | /* Terminate the session. */ | |
1489 | ||
1490 | /* Stop watching for window change. */ | |
996d5e62 | 1491 | signal(SIGWINCH, SIG_DFL); |
3c0ef626 | 1492 | |
b5afdff5 | 1493 | if (compat20) { |
1494 | packet_start(SSH2_MSG_DISCONNECT); | |
1495 | packet_put_int(SSH2_DISCONNECT_BY_APPLICATION); | |
1496 | packet_put_cstring("disconnected by user"); | |
1497 | packet_send(); | |
1498 | packet_write_wait(); | |
1499 | } | |
1500 | ||
3c0ef626 | 1501 | channel_free_all(); |
1502 | ||
1503 | if (have_pty) | |
1504 | leave_raw_mode(); | |
1505 | ||
1506 | /* restore blocking io */ | |
1507 | if (!isatty(fileno(stdin))) | |
1508 | unset_nonblock(fileno(stdin)); | |
1509 | if (!isatty(fileno(stdout))) | |
1510 | unset_nonblock(fileno(stdout)); | |
1511 | if (!isatty(fileno(stderr))) | |
1512 | unset_nonblock(fileno(stderr)); | |
1513 | ||
cdd66111 | 1514 | /* |
1515 | * If there was no shell or command requested, there will be no remote | |
1516 | * exit status to be returned. In that case, clear error code if the | |
1517 | * connection was deliberately terminated at this end. | |
1518 | */ | |
1519 | if (no_shell_flag && received_signal == SIGTERM) { | |
1520 | received_signal = 0; | |
1521 | exit_status = 0; | |
9cb1827b | 1522 | } |
12408a1b | 1523 | |
cdd66111 | 1524 | if (received_signal) |
1525 | fatal("Killed by signal %d.", (int) received_signal); | |
1526 | ||
3c0ef626 | 1527 | /* |
1528 | * In interactive mode (with pseudo tty) display a message indicating | |
1529 | * that the connection has been closed. | |
1530 | */ | |
1531 | if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) { | |
22616013 | 1532 | snprintf(buf, sizeof buf, |
1533 | "Connection to %.64s closed.\r\n", host); | |
3c0ef626 | 1534 | buffer_append(&stderr_buffer, buf, strlen(buf)); |
1535 | } | |
1536 | ||
1537 | /* Output any buffered data for stdout. */ | |
1538 | while (buffer_len(&stdout_buffer) > 0) { | |
1539 | len = write(fileno(stdout), buffer_ptr(&stdout_buffer), | |
1540 | buffer_len(&stdout_buffer)); | |
1541 | if (len <= 0) { | |
1542 | error("Write failed flushing stdout buffer."); | |
1543 | break; | |
1544 | } | |
1545 | buffer_consume(&stdout_buffer, len); | |
3c0ef626 | 1546 | } |
1547 | ||
1548 | /* Output any buffered data for stderr. */ | |
1549 | while (buffer_len(&stderr_buffer) > 0) { | |
1550 | len = write(fileno(stderr), buffer_ptr(&stderr_buffer), | |
1551 | buffer_len(&stderr_buffer)); | |
1552 | if (len <= 0) { | |
1553 | error("Write failed flushing stderr buffer."); | |
1554 | break; | |
1555 | } | |
1556 | buffer_consume(&stderr_buffer, len); | |
3c0ef626 | 1557 | } |
1558 | ||
1559 | /* Clear and free any buffers. */ | |
1560 | memset(buf, 0, sizeof(buf)); | |
1561 | buffer_free(&stdin_buffer); | |
1562 | buffer_free(&stdout_buffer); | |
1563 | buffer_free(&stderr_buffer); | |
1564 | ||
1565 | /* Report bytes transferred, and transfer rates. */ | |
1566 | total_time = get_current_time() - start_time; | |
22616013 | 1567 | packet_get_state(MODE_IN, NULL, NULL, NULL, &ibytes); |
1568 | packet_get_state(MODE_OUT, NULL, NULL, NULL, &obytes); | |
1569 | verbose("Transferred: sent %llu, received %llu bytes, in %.1f seconds", | |
1570 | obytes, ibytes, total_time); | |
3c0ef626 | 1571 | if (total_time > 0) |
22616013 | 1572 | verbose("Bytes per second: sent %.1f, received %.1f", |
1573 | obytes / total_time, ibytes / total_time); | |
3c0ef626 | 1574 | /* Return the exit status of the program. */ |
1575 | debug("Exit status %d", exit_status); | |
1576 | return exit_status; | |
1577 | } | |
1578 | ||
1579 | /*********/ | |
1580 | ||
1581 | static void | |
e9a17296 | 1582 | client_input_stdout_data(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 1583 | { |
1584 | u_int data_len; | |
1585 | char *data = packet_get_string(&data_len); | |
e9a17296 | 1586 | packet_check_eom(); |
3c0ef626 | 1587 | buffer_append(&stdout_buffer, data, data_len); |
1588 | memset(data, 0, data_len); | |
1589 | xfree(data); | |
1590 | } | |
1591 | static void | |
e9a17296 | 1592 | client_input_stderr_data(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 1593 | { |
1594 | u_int data_len; | |
1595 | char *data = packet_get_string(&data_len); | |
e9a17296 | 1596 | packet_check_eom(); |
3c0ef626 | 1597 | buffer_append(&stderr_buffer, data, data_len); |
1598 | memset(data, 0, data_len); | |
1599 | xfree(data); | |
1600 | } | |
1601 | static void | |
e9a17296 | 1602 | client_input_exit_status(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 1603 | { |
3c0ef626 | 1604 | exit_status = packet_get_int(); |
e9a17296 | 1605 | packet_check_eom(); |
3c0ef626 | 1606 | /* Acknowledge the exit. */ |
1607 | packet_start(SSH_CMSG_EXIT_CONFIRMATION); | |
1608 | packet_send(); | |
1609 | /* | |
1610 | * Must wait for packet to be sent since we are | |
1611 | * exiting the loop. | |
1612 | */ | |
1613 | packet_write_wait(); | |
1614 | /* Flag that we want to exit. */ | |
1615 | quit_pending = 1; | |
1616 | } | |
cdd66111 | 1617 | static void |
1618 | client_input_agent_open(int type, u_int32_t seq, void *ctxt) | |
1619 | { | |
1620 | Channel *c = NULL; | |
1621 | int remote_id, sock; | |
1622 | ||
1623 | /* Read the remote channel number from the message. */ | |
1624 | remote_id = packet_get_int(); | |
1625 | packet_check_eom(); | |
1626 | ||
1627 | /* | |
1628 | * Get a connection to the local authentication agent (this may again | |
1629 | * get forwarded). | |
1630 | */ | |
1631 | sock = ssh_get_authentication_socket(); | |
1632 | ||
1633 | /* | |
1634 | * If we could not connect the agent, send an error message back to | |
1635 | * the server. This should never happen unless the agent dies, | |
1636 | * because authentication forwarding is only enabled if we have an | |
1637 | * agent. | |
1638 | */ | |
1639 | if (sock >= 0) { | |
1640 | c = channel_new("", SSH_CHANNEL_OPEN, sock, sock, | |
1641 | -1, 0, 0, 0, "authentication agent connection", 1); | |
1642 | c->remote_id = remote_id; | |
1643 | c->force_drain = 1; | |
1644 | } | |
1645 | if (c == NULL) { | |
1646 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
1647 | packet_put_int(remote_id); | |
1648 | } else { | |
1649 | /* Send a confirmation to the remote host. */ | |
1650 | debug("Forwarding authentication connection."); | |
1651 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1652 | packet_put_int(remote_id); | |
1653 | packet_put_int(c->self); | |
1654 | } | |
1655 | packet_send(); | |
1656 | } | |
3c0ef626 | 1657 | |
1658 | static Channel * | |
1659 | client_request_forwarded_tcpip(const char *request_type, int rchan) | |
1660 | { | |
41b2f314 | 1661 | Channel *c = NULL; |
3c0ef626 | 1662 | char *listen_address, *originator_address; |
91d9cdd3 | 1663 | u_short listen_port, originator_port; |
3c0ef626 | 1664 | |
1665 | /* Get rest of the packet */ | |
1666 | listen_address = packet_get_string(NULL); | |
1667 | listen_port = packet_get_int(); | |
1668 | originator_address = packet_get_string(NULL); | |
1669 | originator_port = packet_get_int(); | |
e9a17296 | 1670 | packet_check_eom(); |
3c0ef626 | 1671 | |
22616013 | 1672 | debug("client_request_forwarded_tcpip: listen %s port %d, " |
1673 | "originator %s port %d", listen_address, listen_port, | |
1674 | originator_address, originator_port); | |
1675 | ||
1676 | c = channel_connect_by_listen_address(listen_port, | |
1677 | "forwarded-tcpip", originator_address); | |
3c0ef626 | 1678 | |
3c0ef626 | 1679 | xfree(originator_address); |
1680 | xfree(listen_address); | |
1681 | return c; | |
1682 | } | |
1683 | ||
41b2f314 | 1684 | static Channel * |
3c0ef626 | 1685 | client_request_x11(const char *request_type, int rchan) |
1686 | { | |
1687 | Channel *c = NULL; | |
1688 | char *originator; | |
91d9cdd3 | 1689 | u_short originator_port; |
3c0ef626 | 1690 | int sock; |
1691 | ||
1692 | if (!options.forward_x11) { | |
1693 | error("Warning: ssh server tried X11 forwarding."); | |
22616013 | 1694 | error("Warning: this is probably a break-in attempt by a " |
1695 | "malicious server."); | |
3c0ef626 | 1696 | return NULL; |
1697 | } | |
1698 | originator = packet_get_string(NULL); | |
1699 | if (datafellows & SSH_BUG_X11FWD) { | |
1700 | debug2("buggy server: x11 request w/o originator_port"); | |
1701 | originator_port = 0; | |
1702 | } else { | |
1703 | originator_port = packet_get_int(); | |
1704 | } | |
e9a17296 | 1705 | packet_check_eom(); |
3c0ef626 | 1706 | /* XXX check permission */ |
1707 | debug("client_request_x11: request from %s %d", originator, | |
1708 | originator_port); | |
1709 | xfree(originator); | |
1710 | sock = x11_connect_display(); | |
1711 | if (sock < 0) | |
1712 | return NULL; | |
76d45d2f | 1713 | /* again is this really necessary for X11? */ |
1714 | if (options.hpn_disabled) | |
3c0ef626 | 1715 | c = channel_new("x11", |
1716 | SSH_CHANNEL_X11_OPEN, sock, sock, -1, | |
0fff78ff | 1717 | CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1); |
76d45d2f | 1718 | else |
1719 | c = channel_new("x11", | |
1720 | SSH_CHANNEL_X11_OPEN, sock, sock, -1, | |
1721 | options.hpn_buffer_size, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1); | |
3c0ef626 | 1722 | c->force_drain = 1; |
1723 | return c; | |
1724 | } | |
1725 | ||
41b2f314 | 1726 | static Channel * |
3c0ef626 | 1727 | client_request_agent(const char *request_type, int rchan) |
1728 | { | |
1729 | Channel *c = NULL; | |
1730 | int sock; | |
1731 | ||
1732 | if (!options.forward_agent) { | |
1733 | error("Warning: ssh server tried agent forwarding."); | |
22616013 | 1734 | error("Warning: this is probably a break-in attempt by a " |
1735 | "malicious server."); | |
3c0ef626 | 1736 | return NULL; |
1737 | } | |
799ae497 | 1738 | sock = ssh_get_authentication_socket(); |
3c0ef626 | 1739 | if (sock < 0) |
1740 | return NULL; | |
76d45d2f | 1741 | if (options.hpn_disabled) |
3c0ef626 | 1742 | c = channel_new("authentication agent connection", |
1743 | SSH_CHANNEL_OPEN, sock, sock, -1, | |
76d45d2f | 1744 | CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0, |
1745 | "authentication agent connection", 1); | |
1746 | else | |
1747 | c = channel_new("authentication agent connection", | |
1748 | SSH_CHANNEL_OPEN, sock, sock, -1, | |
1749 | options.hpn_buffer_size, options.hpn_buffer_size, 0, | |
0fff78ff | 1750 | "authentication agent connection", 1); |
3c0ef626 | 1751 | c->force_drain = 1; |
1752 | return c; | |
1753 | } | |
1754 | ||
d4487008 | 1755 | int |
1756 | client_request_tun_fwd(int tun_mode, int local_tun, int remote_tun) | |
1757 | { | |
1758 | Channel *c; | |
1759 | int fd; | |
1760 | ||
1761 | if (tun_mode == SSH_TUNMODE_NO) | |
1762 | return 0; | |
1763 | ||
1764 | if (!compat20) { | |
91d9cdd3 | 1765 | error("Tunnel forwarding is not supported for protocol 1"); |
d4487008 | 1766 | return -1; |
1767 | } | |
1768 | ||
1769 | debug("Requesting tun unit %d in mode %d", local_tun, tun_mode); | |
1770 | ||
1771 | /* Open local tunnel device */ | |
1772 | if ((fd = tun_open(local_tun, tun_mode)) == -1) { | |
1773 | error("Tunnel device open failed."); | |
1774 | return -1; | |
1775 | } | |
1776 | ||
76d45d2f | 1777 | if(options.hpn_disabled) |
1778 | c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1, | |
1779 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, | |
1780 | 0, "tun", 1); | |
1781 | else | |
d4487008 | 1782 | c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1, |
76d45d2f | 1783 | options.hpn_buffer_size, CHAN_TCP_PACKET_DEFAULT, |
1784 | 0, "tun", 1); | |
d4487008 | 1785 | c->datagram = 1; |
1786 | ||
76d45d2f | 1787 | |
1788 | ||
d4487008 | 1789 | #if defined(SSH_TUN_FILTER) |
1790 | if (options.tun_open == SSH_TUNMODE_POINTOPOINT) | |
1791 | channel_register_filter(c->self, sys_tun_infilter, | |
22616013 | 1792 | sys_tun_outfilter, NULL, NULL); |
d4487008 | 1793 | #endif |
1794 | ||
1795 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1796 | packet_put_cstring("tun@openssh.com"); | |
1797 | packet_put_int(c->self); | |
1798 | packet_put_int(c->local_window_max); | |
1799 | packet_put_int(c->local_maxpacket); | |
1800 | packet_put_int(tun_mode); | |
1801 | packet_put_int(remote_tun); | |
1802 | packet_send(); | |
1803 | ||
1804 | return 0; | |
1805 | } | |
1806 | ||
3c0ef626 | 1807 | /* XXXX move to generic input handler */ |
1808 | static void | |
e9a17296 | 1809 | client_input_channel_open(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 1810 | { |
1811 | Channel *c = NULL; | |
1812 | char *ctype; | |
3c0ef626 | 1813 | int rchan; |
680cee3b | 1814 | u_int rmaxpack, rwindow, len; |
3c0ef626 | 1815 | |
1816 | ctype = packet_get_string(&len); | |
1817 | rchan = packet_get_int(); | |
1818 | rwindow = packet_get_int(); | |
1819 | rmaxpack = packet_get_int(); | |
1820 | ||
1821 | debug("client_input_channel_open: ctype %s rchan %d win %d max %d", | |
1822 | ctype, rchan, rwindow, rmaxpack); | |
1823 | ||
1824 | if (strcmp(ctype, "forwarded-tcpip") == 0) { | |
1825 | c = client_request_forwarded_tcpip(ctype, rchan); | |
1826 | } else if (strcmp(ctype, "x11") == 0) { | |
1827 | c = client_request_x11(ctype, rchan); | |
1828 | } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) { | |
1829 | c = client_request_agent(ctype, rchan); | |
1830 | } | |
1831 | /* XXX duplicate : */ | |
1832 | if (c != NULL) { | |
1833 | debug("confirm %s", ctype); | |
1834 | c->remote_id = rchan; | |
1835 | c->remote_window = rwindow; | |
1836 | c->remote_maxpacket = rmaxpack; | |
1837 | if (c->type != SSH_CHANNEL_CONNECTING) { | |
1838 | packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1839 | packet_put_int(c->remote_id); | |
1840 | packet_put_int(c->self); | |
1841 | packet_put_int(c->local_window); | |
1842 | packet_put_int(c->local_maxpacket); | |
1843 | packet_send(); | |
1844 | } | |
1845 | } else { | |
1846 | debug("failure %s", ctype); | |
1847 | packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); | |
1848 | packet_put_int(rchan); | |
1849 | packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED); | |
1850 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { | |
1851 | packet_put_cstring("open failed"); | |
1852 | packet_put_cstring(""); | |
1853 | } | |
1854 | packet_send(); | |
1855 | } | |
1856 | xfree(ctype); | |
1857 | } | |
1858 | static void | |
e9a17296 | 1859 | client_input_channel_req(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 1860 | { |
1861 | Channel *c = NULL; | |
c9f39d2c | 1862 | int exitval, id, reply, success = 0; |
3c0ef626 | 1863 | char *rtype; |
1864 | ||
1865 | id = packet_get_int(); | |
1866 | rtype = packet_get_string(NULL); | |
1867 | reply = packet_get_char(); | |
1868 | ||
1869 | debug("client_input_channel_req: channel %d rtype %s reply %d", | |
1870 | id, rtype, reply); | |
1871 | ||
c9f39d2c | 1872 | if (id == -1) { |
1873 | error("client_input_channel_req: request for channel -1"); | |
1874 | } else if ((c = channel_lookup(id)) == NULL) { | |
22616013 | 1875 | error("client_input_channel_req: channel %d: " |
1876 | "unknown channel", id); | |
1877 | } else if (strcmp(rtype, "eow@openssh.com") == 0) { | |
1878 | packet_check_eom(); | |
1879 | chan_rcvd_eow(c); | |
3c0ef626 | 1880 | } else if (strcmp(rtype, "exit-status") == 0) { |
c9f39d2c | 1881 | exitval = packet_get_int(); |
1882 | if (id == session_ident) { | |
1883 | success = 1; | |
1884 | exit_status = exitval; | |
1885 | } else if (c->ctl_fd == -1) { | |
1886 | error("client_input_channel_req: unexpected channel %d", | |
1887 | session_ident); | |
1888 | } else { | |
1889 | atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval)); | |
1890 | success = 1; | |
1891 | } | |
e9a17296 | 1892 | packet_check_eom(); |
3c0ef626 | 1893 | } |
1894 | if (reply) { | |
1895 | packet_start(success ? | |
1896 | SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE); | |
91d9cdd3 | 1897 | packet_put_int(c->remote_id); |
3c0ef626 | 1898 | packet_send(); |
1899 | } | |
1900 | xfree(rtype); | |
1901 | } | |
e9a17296 | 1902 | static void |
1903 | client_input_global_request(int type, u_int32_t seq, void *ctxt) | |
1904 | { | |
1905 | char *rtype; | |
1906 | int want_reply; | |
1907 | int success = 0; | |
1908 | ||
1909 | rtype = packet_get_string(NULL); | |
1910 | want_reply = packet_get_char(); | |
cdd66111 | 1911 | debug("client_input_global_request: rtype %s want_reply %d", |
1912 | rtype, want_reply); | |
e9a17296 | 1913 | if (want_reply) { |
1914 | packet_start(success ? | |
1915 | SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE); | |
1916 | packet_send(); | |
1917 | packet_write_wait(); | |
1918 | } | |
1919 | xfree(rtype); | |
1920 | } | |
3c0ef626 | 1921 | |
c9f39d2c | 1922 | void |
1923 | client_session2_setup(int id, int want_tty, int want_subsystem, | |
22616013 | 1924 | const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env) |
c9f39d2c | 1925 | { |
1926 | int len; | |
996d5e62 | 1927 | Channel *c = NULL; |
c9f39d2c | 1928 | |
1929 | debug2("%s: id %d", __func__, id); | |
1930 | ||
996d5e62 | 1931 | if ((c = channel_lookup(id)) == NULL) |
1932 | fatal("client_session2_setup: channel %d: unknown channel", id); | |
1933 | ||
c9f39d2c | 1934 | if (want_tty) { |
1935 | struct winsize ws; | |
c9f39d2c | 1936 | |
1937 | /* Store window size in the packet. */ | |
1938 | if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0) | |
1939 | memset(&ws, 0, sizeof(ws)); | |
1940 | ||
22616013 | 1941 | channel_request_start(id, "pty-req", 1); |
1942 | client_expect_confirm(id, "PTY allocation", 0); | |
c9f39d2c | 1943 | packet_put_cstring(term != NULL ? term : ""); |
9108f8d9 | 1944 | packet_put_int((u_int)ws.ws_col); |
1945 | packet_put_int((u_int)ws.ws_row); | |
1946 | packet_put_int((u_int)ws.ws_xpixel); | |
1947 | packet_put_int((u_int)ws.ws_ypixel); | |
22616013 | 1948 | if (tiop == NULL) |
1949 | tiop = get_saved_tio(); | |
1950 | tty_make_modes(-1, tiop); | |
c9f39d2c | 1951 | packet_send(); |
1952 | /* XXX wait for reply */ | |
996d5e62 | 1953 | c->client_tty = 1; |
c9f39d2c | 1954 | } |
1955 | ||
1956 | /* Transfer any environment variables from client to server */ | |
1957 | if (options.num_send_env != 0 && env != NULL) { | |
1958 | int i, j, matched; | |
1959 | char *name, *val; | |
1960 | ||
1961 | debug("Sending environment."); | |
1962 | for (i = 0; env[i] != NULL; i++) { | |
1963 | /* Split */ | |
1964 | name = xstrdup(env[i]); | |
1965 | if ((val = strchr(name, '=')) == NULL) { | |
2c06c99b | 1966 | xfree(name); |
c9f39d2c | 1967 | continue; |
1968 | } | |
1969 | *val++ = '\0'; | |
1970 | ||
1971 | matched = 0; | |
1972 | for (j = 0; j < options.num_send_env; j++) { | |
1973 | if (match_pattern(name, options.send_env[j])) { | |
1974 | matched = 1; | |
1975 | break; | |
1976 | } | |
1977 | } | |
1978 | if (!matched) { | |
1979 | debug3("Ignored env %s", name); | |
2c06c99b | 1980 | xfree(name); |
c9f39d2c | 1981 | continue; |
1982 | } | |
1983 | ||
1984 | debug("Sending env %s = %s", name, val); | |
1985 | channel_request_start(id, "env", 0); | |
1986 | packet_put_cstring(name); | |
1987 | packet_put_cstring(val); | |
1988 | packet_send(); | |
2c06c99b | 1989 | xfree(name); |
c9f39d2c | 1990 | } |
1991 | } | |
1992 | ||
1993 | len = buffer_len(cmd); | |
1994 | if (len > 0) { | |
1995 | if (len > 900) | |
1996 | len = 900; | |
1997 | if (want_subsystem) { | |
22616013 | 1998 | debug("Sending subsystem: %.*s", |
1999 | len, (u_char*)buffer_ptr(cmd)); | |
2000 | channel_request_start(id, "subsystem", 1); | |
2001 | client_expect_confirm(id, "subsystem", 1); | |
c9f39d2c | 2002 | } else { |
22616013 | 2003 | debug("Sending command: %.*s", |
2004 | len, (u_char*)buffer_ptr(cmd)); | |
2005 | channel_request_start(id, "exec", 1); | |
2006 | client_expect_confirm(id, "exec", 1); | |
c9f39d2c | 2007 | } |
2008 | packet_put_string(buffer_ptr(cmd), buffer_len(cmd)); | |
2009 | packet_send(); | |
2010 | } else { | |
22616013 | 2011 | channel_request_start(id, "shell", 1); |
2012 | client_expect_confirm(id, "shell", 1); | |
c9f39d2c | 2013 | packet_send(); |
2014 | } | |
2015 | } | |
2016 | ||
3c0ef626 | 2017 | static void |
2018 | client_init_dispatch_20(void) | |
2019 | { | |
2020 | dispatch_init(&dispatch_protocol_error); | |
700318f3 | 2021 | |
3c0ef626 | 2022 | dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose); |
2023 | dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data); | |
2024 | dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof); | |
2025 | dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data); | |
2026 | dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open); | |
2027 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); | |
2028 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); | |
2029 | dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req); | |
2030 | dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust); | |
22616013 | 2031 | dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm); |
2032 | dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm); | |
e9a17296 | 2033 | dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request); |
3c0ef626 | 2034 | |
2035 | /* rekeying */ | |
2036 | dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit); | |
700318f3 | 2037 | |
2038 | /* global request reply messages */ | |
2039 | dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply); | |
2040 | dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply); | |
3c0ef626 | 2041 | } |
22616013 | 2042 | |
3c0ef626 | 2043 | static void |
2044 | client_init_dispatch_13(void) | |
2045 | { | |
2046 | dispatch_init(NULL); | |
2047 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close); | |
2048 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation); | |
2049 | dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data); | |
2050 | dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); | |
2051 | dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); | |
2052 | dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open); | |
2053 | dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status); | |
2054 | dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data); | |
2055 | dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data); | |
2056 | ||
2057 | dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ? | |
cdd66111 | 2058 | &client_input_agent_open : &deny_input_open); |
3c0ef626 | 2059 | dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ? |
2060 | &x11_input_open : &deny_input_open); | |
2061 | } | |
22616013 | 2062 | |
3c0ef626 | 2063 | static void |
2064 | client_init_dispatch_15(void) | |
2065 | { | |
2066 | client_init_dispatch_13(); | |
2067 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof); | |
2068 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose); | |
2069 | } | |
22616013 | 2070 | |
3c0ef626 | 2071 | static void |
2072 | client_init_dispatch(void) | |
2073 | { | |
2074 | if (compat20) | |
2075 | client_init_dispatch_20(); | |
2076 | else if (compat13) | |
2077 | client_init_dispatch_13(); | |
2078 | else | |
2079 | client_init_dispatch_15(); | |
2080 | } | |
cdd66111 | 2081 | |
2082 | /* client specific fatal cleanup */ | |
2083 | void | |
2084 | cleanup_exit(int i) | |
2085 | { | |
2086 | leave_raw_mode(); | |
2087 | leave_non_blocking(); | |
22616013 | 2088 | if (options.control_path != NULL && muxserver_sock != -1) |
c9f39d2c | 2089 | unlink(options.control_path); |
cdd66111 | 2090 | _exit(i); |
2091 | } |