]>
Commit | Line | Data |
---|---|---|
50c96367 | 1 | /* $OpenBSD: clientloop.c,v 1.193 2008/05/09 16:21:13 markus Exp $ */ |
8efc0c15 | 2 | /* |
5260325f | 3 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
5260325f | 4 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
5 | * All rights reserved | |
bcbf86ec | 6 | * The main loop for the interactive session (client side). |
6ae2364d | 7 | * |
bcbf86ec | 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". | |
6ae2364d | 13 | * |
6ae2364d | 14 | * |
bcbf86ec | 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 | * | |
6ae2364d | 37 | * |
8ce64345 | 38 | * SSH2 support added by Markus Friedl. |
a96070d4 | 39 | * Copyright (c) 1999, 2000, 2001 Markus Friedl. All rights reserved. |
bcbf86ec | 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. | |
5260325f | 60 | */ |
8efc0c15 | 61 | |
62 | #include "includes.h" | |
bd7c69ea | 63 | |
4095f623 | 64 | #include <sys/types.h> |
e264ac72 | 65 | #include <sys/ioctl.h> |
536c14e8 | 66 | #include <sys/param.h> |
4095f623 | 67 | #ifdef HAVE_SYS_STAT_H |
68 | # include <sys/stat.h> | |
69 | #endif | |
e264ac72 | 70 | #ifdef HAVE_SYS_TIME_H |
71 | # include <sys/time.h> | |
72 | #endif | |
5b04a8bf | 73 | #include <sys/socket.h> |
1d3e026f | 74 | |
b6438382 | 75 | #include <ctype.h> |
028094f4 | 76 | #include <errno.h> |
b5b88c19 | 77 | #ifdef HAVE_PATHS_H |
a75f5360 | 78 | #include <paths.h> |
b5b88c19 | 79 | #endif |
ada68823 | 80 | #include <signal.h> |
24436b92 | 81 | #include <stdarg.h> |
cf851879 | 82 | #include <stdio.h> |
ffa517a8 | 83 | #include <stdlib.h> |
00146caa | 84 | #include <string.h> |
1d3e026f | 85 | #include <termios.h> |
31652869 | 86 | #include <pwd.h> |
5188ba17 | 87 | #include <unistd.h> |
8efc0c15 | 88 | |
3593bdc0 | 89 | #include "openbsd-compat/sys-queue.h" |
31652869 | 90 | #include "xmalloc.h" |
8efc0c15 | 91 | #include "ssh.h" |
42f11eb2 | 92 | #include "ssh1.h" |
93 | #include "ssh2.h" | |
8efc0c15 | 94 | #include "packet.h" |
95 | #include "buffer.h" | |
7368a6c8 | 96 | #include "compat.h" |
a5efa1bb | 97 | #include "channels.h" |
7368a6c8 | 98 | #include "dispatch.h" |
fa08c86b | 99 | #include "key.h" |
31652869 | 100 | #include "cipher.h" |
e092ce67 | 101 | #include "kex.h" |
42f11eb2 | 102 | #include "log.h" |
103 | #include "readconf.h" | |
b5c334cc | 104 | #include "clientloop.h" |
ceec33f3 | 105 | #include "sshconnect.h" |
42f11eb2 | 106 | #include "authfd.h" |
107 | #include "atomicio.h" | |
07d80252 | 108 | #include "sshpty.h" |
e968270c | 109 | #include "misc.h" |
5e96b616 | 110 | #include "monitor_fdpass.h" |
111 | #include "match.h" | |
112 | #include "msg.h" | |
a22aff1f | 113 | |
114 | /* import options */ | |
115 | extern Options options; | |
116 | ||
8efc0c15 | 117 | /* Flag indicating that stdin should be redirected from /dev/null. */ |
118 | extern int stdin_null_flag; | |
119 | ||
66357af5 | 120 | /* Flag indicating that no shell has been requested */ |
121 | extern int no_shell_flag; | |
122 | ||
5e96b616 | 123 | /* Control socket */ |
3bcced4c | 124 | extern int muxserver_sock; |
5e96b616 | 125 | |
aa3378df | 126 | /* |
127 | * Name of the host we are connecting to. This is the name given on the | |
128 | * command line, or the HostName specified for the user-supplied name in a | |
129 | * configuration file. | |
130 | */ | |
8efc0c15 | 131 | extern char *host; |
132 | ||
aa3378df | 133 | /* |
134 | * Flag to indicate that we have received a window change signal which has | |
135 | * not yet been processed. This will cause a message indicating the new | |
136 | * window size to be sent to the server a little later. This is volatile | |
137 | * because this is updated in a signal handler. | |
138 | */ | |
7a934d1b | 139 | static volatile sig_atomic_t received_window_change_signal = 0; |
140 | static volatile sig_atomic_t received_signal = 0; | |
8efc0c15 | 141 | |
7b9b0103 | 142 | /* Flag indicating whether the user's terminal is in non-blocking mode. */ |
8efc0c15 | 143 | static int in_non_blocking_mode = 0; |
144 | ||
145 | /* Common data for the client loop code. */ | |
50394f26 | 146 | static volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */ |
2e73a022 | 147 | static int escape_char; /* Escape character. */ |
5260325f | 148 | static int escape_pending; /* Last character was the escape character */ |
149 | static int last_was_cr; /* Last character was a newline. */ | |
150 | static int exit_status; /* Used to store the exit status of the command. */ | |
151 | static int stdin_eof; /* EOF has been encountered on standard error. */ | |
152 | static Buffer stdin_buffer; /* Buffer for stdin data. */ | |
153 | static Buffer stdout_buffer; /* Buffer for stdout data. */ | |
154 | static Buffer stderr_buffer; /* Buffer for stderr data. */ | |
1e3b8b07 | 155 | static u_long stdin_bytes, stdout_bytes, stderr_bytes; |
156 | static u_int buffer_high;/* Soft max buffer size. */ | |
5260325f | 157 | static int connection_in; /* Connection to server (input). */ |
158 | static int connection_out; /* Connection to server (output). */ | |
c422989b | 159 | static int need_rekeying; /* Set to non-zero if rekeying is requested. */ |
eb0dd41f | 160 | static int session_closed = 0; /* In SSH2: login session closed. */ |
8efc0c15 | 161 | |
396c147e | 162 | static void client_init_dispatch(void); |
8ce64345 | 163 | int session_ident = -1; |
164 | ||
95d3c124 | 165 | struct channel_reply_ctx { |
166 | const char *request_type; | |
167 | int id, do_close; | |
168 | }; | |
169 | ||
e092ce67 | 170 | /*XXX*/ |
171 | extern Kex *xxx_kex; | |
172 | ||
5e96b616 | 173 | void ssh_process_session2_setup(int, int, int, Buffer *); |
174 | ||
8efc0c15 | 175 | /* Restores stdin to blocking mode. */ |
176 | ||
396c147e | 177 | static void |
5ca51e19 | 178 | leave_non_blocking(void) |
8efc0c15 | 179 | { |
5260325f | 180 | if (in_non_blocking_mode) { |
1b273ece | 181 | unset_nonblock(fileno(stdin)); |
5260325f | 182 | in_non_blocking_mode = 0; |
5260325f | 183 | } |
8efc0c15 | 184 | } |
185 | ||
5260325f | 186 | /* Puts stdin terminal in non-blocking mode. */ |
187 | ||
396c147e | 188 | static void |
5ca51e19 | 189 | enter_non_blocking(void) |
8efc0c15 | 190 | { |
5260325f | 191 | in_non_blocking_mode = 1; |
170694d7 | 192 | set_nonblock(fileno(stdin)); |
8efc0c15 | 193 | } |
194 | ||
aa3378df | 195 | /* |
196 | * Signal handler for the window change signal (SIGWINCH). This just sets a | |
197 | * flag indicating that the window has changed. | |
198 | */ | |
3efa8ea9 | 199 | /*ARGSUSED */ |
396c147e | 200 | static void |
5260325f | 201 | window_change_handler(int sig) |
8efc0c15 | 202 | { |
5260325f | 203 | received_window_change_signal = 1; |
204 | signal(SIGWINCH, window_change_handler); | |
8efc0c15 | 205 | } |
206 | ||
aa3378df | 207 | /* |
208 | * Signal handler for signals that cause the program to terminate. These | |
209 | * signals must be trapped to restore terminal modes. | |
210 | */ | |
3efa8ea9 | 211 | /*ARGSUSED */ |
396c147e | 212 | static void |
5260325f | 213 | signal_handler(int sig) |
8efc0c15 | 214 | { |
c9130033 | 215 | received_signal = sig; |
216 | quit_pending = 1; | |
8efc0c15 | 217 | } |
218 | ||
aa3378df | 219 | /* |
220 | * Returns current time in seconds from Jan 1, 1970 with the maximum | |
221 | * available resolution. | |
222 | */ | |
8efc0c15 | 223 | |
396c147e | 224 | static double |
5ca51e19 | 225 | get_current_time(void) |
8efc0c15 | 226 | { |
5260325f | 227 | struct timeval tv; |
228 | gettimeofday(&tv, NULL); | |
229 | return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0; | |
8efc0c15 | 230 | } |
231 | ||
9bf083eb | 232 | #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1" |
233 | void | |
234 | client_x11_get_proto(const char *display, const char *xauth_path, | |
235 | u_int trusted, char **_proto, char **_data) | |
236 | { | |
237 | char cmd[1024]; | |
238 | char line[512]; | |
239 | char xdisplay[512]; | |
240 | static char proto[512], data[512]; | |
241 | FILE *f; | |
242 | int got_data = 0, generated = 0, do_unlink = 0, i; | |
243 | char *xauthdir, *xauthfile; | |
244 | struct stat st; | |
245 | ||
246 | xauthdir = xauthfile = NULL; | |
247 | *_proto = proto; | |
248 | *_data = data; | |
249 | proto[0] = data[0] = '\0'; | |
250 | ||
251 | if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) { | |
252 | debug("No xauth program."); | |
253 | } else { | |
254 | if (display == NULL) { | |
255 | debug("x11_get_proto: DISPLAY not set"); | |
256 | return; | |
257 | } | |
258 | /* | |
259 | * Handle FamilyLocal case where $DISPLAY does | |
260 | * not match an authorization entry. For this we | |
261 | * just try "xauth list unix:displaynum.screennum". | |
262 | * XXX: "localhost" match to determine FamilyLocal | |
263 | * is not perfect. | |
264 | */ | |
265 | if (strncmp(display, "localhost:", 10) == 0) { | |
266 | snprintf(xdisplay, sizeof(xdisplay), "unix:%s", | |
267 | display + 10); | |
268 | display = xdisplay; | |
269 | } | |
270 | if (trusted == 0) { | |
271 | xauthdir = xmalloc(MAXPATHLEN); | |
272 | xauthfile = xmalloc(MAXPATHLEN); | |
273 | strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN); | |
274 | if (mkdtemp(xauthdir) != NULL) { | |
275 | do_unlink = 1; | |
276 | snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile", | |
277 | xauthdir); | |
278 | snprintf(cmd, sizeof(cmd), | |
279 | "%s -f %s generate %s " SSH_X11_PROTO | |
280 | " untrusted timeout 1200 2>" _PATH_DEVNULL, | |
281 | xauth_path, xauthfile, display); | |
282 | debug2("x11_get_proto: %s", cmd); | |
283 | if (system(cmd) == 0) | |
284 | generated = 1; | |
285 | } | |
286 | } | |
ed64eeca | 287 | |
288 | /* | |
289 | * When in untrusted mode, we read the cookie only if it was | |
290 | * successfully generated as an untrusted one in the step | |
291 | * above. | |
292 | */ | |
293 | if (trusted || generated) { | |
294 | snprintf(cmd, sizeof(cmd), | |
295 | "%s %s%s list %s 2>" _PATH_DEVNULL, | |
296 | xauth_path, | |
297 | generated ? "-f " : "" , | |
298 | generated ? xauthfile : "", | |
299 | display); | |
300 | debug2("x11_get_proto: %s", cmd); | |
301 | f = popen(cmd, "r"); | |
302 | if (f && fgets(line, sizeof(line), f) && | |
303 | sscanf(line, "%*s %511s %511s", proto, data) == 2) | |
304 | got_data = 1; | |
305 | if (f) | |
306 | pclose(f); | |
307 | } else | |
308 | error("Warning: untrusted X11 forwarding setup failed: " | |
309 | "xauth key data not generated"); | |
9bf083eb | 310 | } |
311 | ||
312 | if (do_unlink) { | |
313 | unlink(xauthfile); | |
314 | rmdir(xauthdir); | |
315 | } | |
316 | if (xauthdir) | |
317 | xfree(xauthdir); | |
318 | if (xauthfile) | |
319 | xfree(xauthfile); | |
320 | ||
321 | /* | |
322 | * If we didn't get authentication data, just make up some | |
323 | * data. The forwarding code will check the validity of the | |
324 | * response anyway, and substitute this data. The X11 | |
325 | * server, however, will ignore this fake data and use | |
326 | * whatever authentication mechanisms it was using otherwise | |
327 | * for the local connection. | |
328 | */ | |
329 | if (!got_data) { | |
330 | u_int32_t rnd = 0; | |
331 | ||
332 | logit("Warning: No xauth data; " | |
333 | "using fake authentication data for X11 forwarding."); | |
334 | strlcpy(proto, SSH_X11_PROTO, sizeof proto); | |
335 | for (i = 0; i < 16; i++) { | |
336 | if (i % 4 == 0) | |
337 | rnd = arc4random(); | |
338 | snprintf(data + 2 * i, sizeof data - 2 * i, "%02x", | |
339 | rnd & 0xff); | |
340 | rnd >>= 8; | |
341 | } | |
342 | } | |
343 | } | |
344 | ||
aa3378df | 345 | /* |
346 | * This is called when the interactive is entered. This checks if there is | |
347 | * an EOF coming on stdin. We must check this explicitly, as select() does | |
348 | * not appear to wake up when redirecting from /dev/null. | |
349 | */ | |
8efc0c15 | 350 | |
396c147e | 351 | static void |
5ca51e19 | 352 | client_check_initial_eof_on_stdin(void) |
8efc0c15 | 353 | { |
5260325f | 354 | int len; |
355 | char buf[1]; | |
356 | ||
aa3378df | 357 | /* |
358 | * If standard input is to be "redirected from /dev/null", we simply | |
359 | * mark that we have seen an EOF and send an EOF message to the | |
360 | * server. Otherwise, we try to read a single character; it appears | |
361 | * that for some files, such /dev/null, select() never wakes up for | |
362 | * read for this descriptor, which means that we never get EOF. This | |
363 | * way we will get the EOF if stdin comes from /dev/null or similar. | |
364 | */ | |
5260325f | 365 | if (stdin_null_flag) { |
366 | /* Fake EOF on stdin. */ | |
367 | debug("Sending eof."); | |
368 | stdin_eof = 1; | |
369 | packet_start(SSH_CMSG_EOF); | |
370 | packet_send(); | |
371 | } else { | |
5260325f | 372 | enter_non_blocking(); |
373 | ||
374 | /* Check for immediate EOF on stdin. */ | |
375 | len = read(fileno(stdin), buf, 1); | |
376 | if (len == 0) { | |
aa3378df | 377 | /* EOF. Record that we have seen it and send EOF to server. */ |
5260325f | 378 | debug("Sending eof."); |
379 | stdin_eof = 1; | |
380 | packet_start(SSH_CMSG_EOF); | |
381 | packet_send(); | |
382 | } else if (len > 0) { | |
aa3378df | 383 | /* |
384 | * Got data. We must store the data in the buffer, | |
385 | * and also process it as an escape character if | |
386 | * appropriate. | |
387 | */ | |
1e3b8b07 | 388 | if ((u_char) buf[0] == escape_char) |
5260325f | 389 | escape_pending = 1; |
7e8911cd | 390 | else |
5260325f | 391 | buffer_append(&stdin_buffer, buf, 1); |
5260325f | 392 | } |
5260325f | 393 | leave_non_blocking(); |
8efc0c15 | 394 | } |
8efc0c15 | 395 | } |
396 | ||
8efc0c15 | 397 | |
aa3378df | 398 | /* |
399 | * Make packets from buffered stdin data, and buffer them for sending to the | |
400 | * connection. | |
401 | */ | |
8efc0c15 | 402 | |
396c147e | 403 | static void |
5ca51e19 | 404 | client_make_packets_from_stdin_data(void) |
8efc0c15 | 405 | { |
1e3b8b07 | 406 | u_int len; |
5260325f | 407 | |
408 | /* Send buffered stdin data to the server. */ | |
409 | while (buffer_len(&stdin_buffer) > 0 && | |
184eed6a | 410 | packet_not_very_much_data_to_write()) { |
5260325f | 411 | len = buffer_len(&stdin_buffer); |
412 | /* Keep the packets at reasonable size. */ | |
413 | if (len > packet_get_maxsize()) | |
414 | len = packet_get_maxsize(); | |
415 | packet_start(SSH_CMSG_STDIN_DATA); | |
416 | packet_put_string(buffer_ptr(&stdin_buffer), len); | |
417 | packet_send(); | |
418 | buffer_consume(&stdin_buffer, len); | |
7e8911cd | 419 | stdin_bytes += len; |
5260325f | 420 | /* If we have a pending EOF, send it now. */ |
421 | if (stdin_eof && buffer_len(&stdin_buffer) == 0) { | |
422 | packet_start(SSH_CMSG_EOF); | |
423 | packet_send(); | |
424 | } | |
8efc0c15 | 425 | } |
8efc0c15 | 426 | } |
427 | ||
aa3378df | 428 | /* |
429 | * Checks if the client window has changed, and sends a packet about it to | |
430 | * the server if so. The actual change is detected elsewhere (by a software | |
431 | * interrupt on Unix); this just checks the flag and sends a message if | |
432 | * appropriate. | |
433 | */ | |
8efc0c15 | 434 | |
396c147e | 435 | static void |
5ca51e19 | 436 | client_check_window_change(void) |
8efc0c15 | 437 | { |
8ce64345 | 438 | struct winsize ws; |
439 | ||
440 | if (! received_window_change_signal) | |
441 | return; | |
442 | /** XXX race */ | |
443 | received_window_change_signal = 0; | |
444 | ||
de273eef | 445 | debug2("client_check_window_change: changed"); |
8ce64345 | 446 | |
447 | if (compat20) { | |
5e96b616 | 448 | channel_send_window_changes(); |
8ce64345 | 449 | } else { |
5e96b616 | 450 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) |
451 | return; | |
8ce64345 | 452 | packet_start(SSH_CMSG_WINDOW_SIZE); |
148de80c | 453 | packet_put_int((u_int)ws.ws_row); |
454 | packet_put_int((u_int)ws.ws_col); | |
455 | packet_put_int((u_int)ws.ws_xpixel); | |
456 | packet_put_int((u_int)ws.ws_ypixel); | |
8ce64345 | 457 | packet_send(); |
8efc0c15 | 458 | } |
8efc0c15 | 459 | } |
460 | ||
5d8d32a3 | 461 | static void |
462 | client_global_request_reply(int type, u_int32_t seq, void *ctxt) | |
463 | { | |
ac47b626 | 464 | keep_alive_timeouts = 0; |
5d8d32a3 | 465 | client_global_request_reply_fwd(type, seq, ctxt); |
466 | } | |
467 | ||
468 | static void | |
469 | server_alive_check(void) | |
470 | { | |
ac47b626 | 471 | if (++keep_alive_timeouts > options.server_alive_count_max) { |
bd3b2cb2 | 472 | logit("Timeout, server not responding."); |
473 | cleanup_exit(255); | |
474 | } | |
5d8d32a3 | 475 | packet_start(SSH2_MSG_GLOBAL_REQUEST); |
476 | packet_put_cstring("keepalive@openssh.com"); | |
477 | packet_put_char(1); /* boolean: want reply */ | |
478 | packet_send(); | |
479 | } | |
480 | ||
aa3378df | 481 | /* |
482 | * Waits until the client can do something (some data becomes available on | |
483 | * one of the file descriptors). | |
484 | */ | |
396c147e | 485 | static void |
39929cdb | 486 | client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp, |
9a995072 | 487 | int *maxfdp, u_int *nallocp, int rekeying) |
8efc0c15 | 488 | { |
5d8d32a3 | 489 | struct timeval tv, *tvp; |
490 | int ret; | |
491 | ||
39929cdb | 492 | /* Add any selections by the channel mechanism. */ |
489aa2e9 | 493 | channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying); |
5260325f | 494 | |
8ce64345 | 495 | if (!compat20) { |
496 | /* Read from the connection, unless our buffers are full. */ | |
497 | if (buffer_len(&stdout_buffer) < buffer_high && | |
498 | buffer_len(&stderr_buffer) < buffer_high && | |
499 | channel_not_very_much_buffered_data()) | |
39929cdb | 500 | FD_SET(connection_in, *readsetp); |
8ce64345 | 501 | /* |
502 | * Read from stdin, unless we have seen EOF or have very much | |
503 | * buffered data to send to the server. | |
504 | */ | |
505 | if (!stdin_eof && packet_not_very_much_data_to_write()) | |
39929cdb | 506 | FD_SET(fileno(stdin), *readsetp); |
8ce64345 | 507 | |
508 | /* Select stdout/stderr if have data in buffer. */ | |
509 | if (buffer_len(&stdout_buffer) > 0) | |
39929cdb | 510 | FD_SET(fileno(stdout), *writesetp); |
8ce64345 | 511 | if (buffer_len(&stderr_buffer) > 0) |
39929cdb | 512 | FD_SET(fileno(stderr), *writesetp); |
8ce64345 | 513 | } else { |
24b6b45f | 514 | /* channel_prepare_select could have closed the last channel */ |
fd6cfbaf | 515 | if (session_closed && !channel_still_open() && |
516 | !packet_have_data_to_write()) { | |
517 | /* clear mask since we did not call select() */ | |
b3ad8fe6 | 518 | memset(*readsetp, 0, *nallocp); |
519 | memset(*writesetp, 0, *nallocp); | |
fd6cfbaf | 520 | return; |
24b6b45f | 521 | } else { |
522 | FD_SET(connection_in, *readsetp); | |
523 | } | |
8ce64345 | 524 | } |
5260325f | 525 | |
5260325f | 526 | /* Select server connection if have data to write to the server. */ |
527 | if (packet_have_data_to_write()) | |
39929cdb | 528 | FD_SET(connection_out, *writesetp); |
5260325f | 529 | |
3bcced4c | 530 | if (muxserver_sock != -1) |
531 | FD_SET(muxserver_sock, *readsetp); | |
5e96b616 | 532 | |
aa3378df | 533 | /* |
534 | * Wait for something to happen. This will suspend the process until | |
535 | * some selected descriptor can be read, written, or has some other | |
5d8d32a3 | 536 | * event pending. |
aa3378df | 537 | */ |
5260325f | 538 | |
5d8d32a3 | 539 | if (options.server_alive_interval == 0 || !compat20) |
540 | tvp = NULL; | |
f2107e97 | 541 | else { |
5d8d32a3 | 542 | tv.tv_sec = options.server_alive_interval; |
543 | tv.tv_usec = 0; | |
544 | tvp = &tv; | |
545 | } | |
546 | ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp); | |
547 | if (ret < 0) { | |
5260325f | 548 | char buf[100]; |
fd193ca4 | 549 | |
550 | /* | |
551 | * We have to clear the select masks, because we return. | |
552 | * We have to return, because the mainloop checks for the flags | |
553 | * set by the signal handlers. | |
554 | */ | |
b3ad8fe6 | 555 | memset(*readsetp, 0, *nallocp); |
556 | memset(*writesetp, 0, *nallocp); | |
fd193ca4 | 557 | |
5260325f | 558 | if (errno == EINTR) |
559 | return; | |
560 | /* Note: we might still have data in the buffers. */ | |
561 | snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno)); | |
562 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
5260325f | 563 | quit_pending = 1; |
5d8d32a3 | 564 | } else if (ret == 0) |
565 | server_alive_check(); | |
8efc0c15 | 566 | } |
567 | ||
396c147e | 568 | static void |
2e73a022 | 569 | client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr) |
8efc0c15 | 570 | { |
5260325f | 571 | /* Flush stdout and stderr buffers. */ |
2e73a022 | 572 | if (buffer_len(bout) > 0) |
dc54438a | 573 | atomicio(vwrite, fileno(stdout), buffer_ptr(bout), buffer_len(bout)); |
2e73a022 | 574 | if (buffer_len(berr) > 0) |
dc54438a | 575 | atomicio(vwrite, fileno(stderr), buffer_ptr(berr), buffer_len(berr)); |
5260325f | 576 | |
5260325f | 577 | leave_raw_mode(); |
578 | ||
aa3378df | 579 | /* |
580 | * Free (and clear) the buffer to reduce the amount of data that gets | |
581 | * written to swap. | |
582 | */ | |
2e73a022 | 583 | buffer_free(bin); |
584 | buffer_free(bout); | |
585 | buffer_free(berr); | |
5260325f | 586 | |
5260325f | 587 | /* Send the suspend signal to the program itself. */ |
588 | kill(getpid(), SIGTSTP); | |
589 | ||
2c9a4d41 | 590 | /* Reset window sizes in case they have changed */ |
591 | received_window_change_signal = 1; | |
5260325f | 592 | |
593 | /* OK, we have been continued by the user. Reinitialize buffers. */ | |
2e73a022 | 594 | buffer_init(bin); |
595 | buffer_init(bout); | |
596 | buffer_init(berr); | |
5260325f | 597 | |
5260325f | 598 | enter_raw_mode(); |
8efc0c15 | 599 | } |
600 | ||
396c147e | 601 | static void |
b476adfa | 602 | client_process_net_input(fd_set *readset) |
8efc0c15 | 603 | { |
8ce64345 | 604 | int len; |
605 | char buf[8192]; | |
5260325f | 606 | |
aa3378df | 607 | /* |
608 | * Read input from the server, and add any such data to the buffer of | |
609 | * the packet subsystem. | |
610 | */ | |
5260325f | 611 | if (FD_ISSET(connection_in, readset)) { |
612 | /* Read as much as possible. */ | |
613 | len = read(connection_in, buf, sizeof(buf)); | |
614 | if (len == 0) { | |
615 | /* Received EOF. The remote host has closed the connection. */ | |
616 | snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n", | |
617 | host); | |
8efc0c15 | 618 | buffer_append(&stderr_buffer, buf, strlen(buf)); |
8efc0c15 | 619 | quit_pending = 1; |
620 | return; | |
5260325f | 621 | } |
aa3378df | 622 | /* |
623 | * There is a kernel bug on Solaris that causes select to | |
624 | * sometimes wake up even though there is no data available. | |
625 | */ | |
09cb311c | 626 | if (len < 0 && (errno == EAGAIN || errno == EINTR)) |
5260325f | 627 | len = 0; |
628 | ||
629 | if (len < 0) { | |
630 | /* An error has encountered. Perhaps there is a network problem. */ | |
631 | snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n", | |
632 | host, strerror(errno)); | |
633 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
5260325f | 634 | quit_pending = 1; |
635 | return; | |
636 | } | |
637 | packet_process_incoming(buf, len); | |
638 | } | |
8ce64345 | 639 | } |
640 | ||
5e96b616 | 641 | static void |
95d3c124 | 642 | client_status_confirm(int type, Channel *c, void *ctx) |
5e96b616 | 643 | { |
95d3c124 | 644 | struct channel_reply_ctx *cr = (struct channel_reply_ctx *)ctx; |
645 | char errmsg[256]; | |
646 | int tochan; | |
647 | ||
648 | /* XXX supress on mux _client_ quietmode */ | |
649 | tochan = options.log_level >= SYSLOG_LEVEL_ERROR && | |
650 | c->ctl_fd != -1 && c->extended_usage == CHAN_EXTENDED_WRITE; | |
651 | ||
652 | if (type == SSH2_MSG_CHANNEL_SUCCESS) { | |
653 | debug2("%s request accepted on channel %d", | |
654 | cr->request_type, c->self); | |
655 | } else if (type == SSH2_MSG_CHANNEL_FAILURE) { | |
656 | if (tochan) { | |
657 | snprintf(errmsg, sizeof(errmsg), | |
658 | "%s request failed\r\n", cr->request_type); | |
659 | } else { | |
660 | snprintf(errmsg, sizeof(errmsg), | |
661 | "%s request failed on channel %d", | |
662 | cr->request_type, c->self); | |
663 | } | |
664 | /* If error occurred on primary session channel, then exit */ | |
665 | if (cr->do_close && c->self == session_ident) | |
666 | fatal("%s", errmsg); | |
667 | /* If error occurred on mux client, append to their stderr */ | |
668 | if (tochan) | |
669 | buffer_append(&c->extended, errmsg, strlen(errmsg)); | |
670 | else | |
671 | error("%s", errmsg); | |
672 | if (cr->do_close) { | |
673 | chan_read_failed(c); | |
674 | chan_write_failed(c); | |
675 | } | |
676 | } | |
677 | xfree(cr); | |
678 | } | |
f2107e97 | 679 | |
95d3c124 | 680 | static void |
681 | client_abandon_status_confirm(Channel *c, void *ctx) | |
682 | { | |
683 | xfree(ctx); | |
684 | } | |
5e96b616 | 685 | |
95d3c124 | 686 | static void |
687 | client_expect_confirm(int id, const char *request, int do_close) | |
688 | { | |
689 | struct channel_reply_ctx *cr = xmalloc(sizeof(*cr)); | |
5e96b616 | 690 | |
95d3c124 | 691 | cr->request_type = request; |
692 | cr->do_close = do_close; | |
693 | ||
694 | channel_register_status_confirm(id, client_status_confirm, | |
695 | client_abandon_status_confirm, cr); | |
5e96b616 | 696 | } |
697 | ||
c53c54c2 | 698 | static void |
ec9b7086 | 699 | process_cmdline(void) |
c53c54c2 | 700 | { |
c53c54c2 | 701 | void (*handler)(int); |
3867aa0a | 702 | char *s, *cmd, *cancel_host; |
d740ec16 | 703 | int delete = 0; |
c53c54c2 | 704 | int local = 0; |
3867aa0a | 705 | u_short cancel_port; |
706 | Forward fwd; | |
c53c54c2 | 707 | |
16912319 | 708 | bzero(&fwd, sizeof(fwd)); |
709 | fwd.listen_host = fwd.connect_host = NULL; | |
710 | ||
c53c54c2 | 711 | leave_raw_mode(); |
875ec275 | 712 | handler = signal(SIGINT, SIG_IGN); |
ec9b7086 | 713 | cmd = s = read_passphrase("\r\nssh> ", RP_ECHO); |
c53c54c2 | 714 | if (s == NULL) |
715 | goto out; | |
f48fbab3 | 716 | while (isspace(*s)) |
c53c54c2 | 717 | s++; |
d740ec16 | 718 | if (*s == '-') |
719 | s++; /* Skip cmdline '-', if any */ | |
27c6fcae | 720 | if (*s == '\0') |
c53c54c2 | 721 | goto out; |
d740ec16 | 722 | |
7069a5e2 | 723 | if (*s == 'h' || *s == 'H' || *s == '?') { |
d740ec16 | 724 | logit("Commands:"); |
9f1090be | 725 | logit(" -L[bind_address:]port:host:hostport " |
726 | "Request local forward"); | |
727 | logit(" -R[bind_address:]port:host:hostport " | |
728 | "Request remote forward"); | |
33f13fa5 | 729 | logit(" -KR[bind_address:]port " |
9f1090be | 730 | "Cancel remote forward"); |
d20f3c9e | 731 | if (!options.permit_local_command) |
732 | goto out; | |
9f1090be | 733 | logit(" !args " |
734 | "Execute local command"); | |
d20f3c9e | 735 | goto out; |
736 | } | |
737 | ||
738 | if (*s == '!' && options.permit_local_command) { | |
739 | s++; | |
740 | ssh_local_cmd(s); | |
d740ec16 | 741 | goto out; |
742 | } | |
743 | ||
744 | if (*s == 'K') { | |
745 | delete = 1; | |
746 | s++; | |
747 | } | |
748 | if (*s != 'L' && *s != 'R') { | |
bbe88b6d | 749 | logit("Invalid command."); |
c53c54c2 | 750 | goto out; |
751 | } | |
d740ec16 | 752 | if (*s == 'L') |
c53c54c2 | 753 | local = 1; |
d740ec16 | 754 | if (local && delete) { |
755 | logit("Not supported."); | |
756 | goto out; | |
757 | } | |
758 | if ((!local || delete) && !compat20) { | |
bbe88b6d | 759 | logit("Not supported for SSH protocol version 1."); |
c53c54c2 | 760 | goto out; |
761 | } | |
d740ec16 | 762 | |
f48fbab3 | 763 | while (isspace(*++s)) |
764 | ; | |
c53c54c2 | 765 | |
d740ec16 | 766 | if (delete) { |
3867aa0a | 767 | cancel_port = 0; |
768 | cancel_host = hpdelim(&s); /* may be NULL */ | |
769 | if (s != NULL) { | |
770 | cancel_port = a2port(s); | |
771 | cancel_host = cleanhostname(cancel_host); | |
772 | } else { | |
773 | cancel_port = a2port(cancel_host); | |
774 | cancel_host = NULL; | |
d740ec16 | 775 | } |
3867aa0a | 776 | if (cancel_port == 0) { |
777 | logit("Bad forwarding close port"); | |
c53c54c2 | 778 | goto out; |
779 | } | |
3867aa0a | 780 | channel_request_rforward_cancel(cancel_host, cancel_port); |
d740ec16 | 781 | } else { |
3867aa0a | 782 | if (!parse_forward(&fwd, s)) { |
d740ec16 | 783 | logit("Bad forwarding specification."); |
784 | goto out; | |
785 | } | |
d740ec16 | 786 | if (local) { |
3867aa0a | 787 | if (channel_setup_local_fwd_listener(fwd.listen_host, |
788 | fwd.listen_port, fwd.connect_host, | |
789 | fwd.connect_port, options.gateway_ports) < 0) { | |
d740ec16 | 790 | logit("Port forwarding failed."); |
791 | goto out; | |
792 | } | |
3867aa0a | 793 | } else { |
42ea6f5e | 794 | if (channel_request_remote_forwarding(fwd.listen_host, |
3867aa0a | 795 | fwd.listen_port, fwd.connect_host, |
42ea6f5e | 796 | fwd.connect_port) < 0) { |
797 | logit("Port forwarding failed."); | |
798 | goto out; | |
799 | } | |
3867aa0a | 800 | } |
801 | ||
d740ec16 | 802 | logit("Forwarding port."); |
803 | } | |
804 | ||
c53c54c2 | 805 | out: |
806 | signal(SIGINT, handler); | |
807 | enter_raw_mode(); | |
808 | if (cmd) | |
809 | xfree(cmd); | |
16912319 | 810 | if (fwd.listen_host != NULL) |
811 | xfree(fwd.listen_host); | |
812 | if (fwd.connect_host != NULL) | |
813 | xfree(fwd.connect_host); | |
c53c54c2 | 814 | } |
815 | ||
2e73a022 | 816 | /* process the characters one by one */ |
396c147e | 817 | static int |
2e73a022 | 818 | process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len) |
819 | { | |
820 | char string[1024]; | |
821 | pid_t pid; | |
822 | int bytes = 0; | |
1e3b8b07 | 823 | u_int i; |
824 | u_char ch; | |
2e73a022 | 825 | char *s; |
826 | ||
2ceb8101 | 827 | if (len <= 0) |
828 | return (0); | |
829 | ||
830 | for (i = 0; i < (u_int)len; i++) { | |
2e73a022 | 831 | /* Get one character at a time. */ |
832 | ch = buf[i]; | |
833 | ||
834 | if (escape_pending) { | |
835 | /* We have previously seen an escape character. */ | |
836 | /* Clear the flag now. */ | |
837 | escape_pending = 0; | |
838 | ||
839 | /* Process the escaped character. */ | |
840 | switch (ch) { | |
841 | case '.': | |
842 | /* Terminate the connection. */ | |
843 | snprintf(string, sizeof string, "%c.\r\n", escape_char); | |
844 | buffer_append(berr, string, strlen(string)); | |
2e73a022 | 845 | |
846 | quit_pending = 1; | |
847 | return -1; | |
848 | ||
849 | case 'Z' - 64: | |
850 | /* Suspend the program. */ | |
851 | /* Print a message to that effect to the user. */ | |
852 | snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char); | |
853 | buffer_append(berr, string, strlen(string)); | |
2e73a022 | 854 | |
855 | /* Restore terminal modes and suspend. */ | |
856 | client_suspend_self(bin, bout, berr); | |
857 | ||
858 | /* We have been continued. */ | |
859 | continue; | |
860 | ||
16a79097 | 861 | case 'B': |
862 | if (compat20) { | |
863 | snprintf(string, sizeof string, | |
864 | "%cB\r\n", escape_char); | |
865 | buffer_append(berr, string, | |
866 | strlen(string)); | |
867 | channel_request_start(session_ident, | |
868 | "break", 0); | |
869 | packet_put_int(1000); | |
870 | packet_send(); | |
871 | } | |
872 | continue; | |
873 | ||
e092ce67 | 874 | case 'R': |
54506d2e | 875 | if (compat20) { |
876 | if (datafellows & SSH_BUG_NOREKEY) | |
bbe88b6d | 877 | logit("Server does not support re-keying"); |
54506d2e | 878 | else |
879 | need_rekeying = 1; | |
880 | } | |
e092ce67 | 881 | continue; |
882 | ||
2e73a022 | 883 | case '&': |
2e73a022 | 884 | /* |
885 | * Detach the program (continue to serve connections, | |
886 | * but put in background and no more new connections). | |
887 | */ | |
2e73a022 | 888 | /* Restore tty modes. */ |
889 | leave_raw_mode(); | |
890 | ||
891 | /* Stop listening for new connections. */ | |
c6940381 | 892 | channel_stop_listening(); |
2e73a022 | 893 | |
c6940381 | 894 | snprintf(string, sizeof string, |
895 | "%c& [backgrounded]\n", escape_char); | |
896 | buffer_append(berr, string, strlen(string)); | |
2e73a022 | 897 | |
898 | /* Fork into background. */ | |
899 | pid = fork(); | |
900 | if (pid < 0) { | |
901 | error("fork: %.100s", strerror(errno)); | |
902 | continue; | |
903 | } | |
904 | if (pid != 0) { /* This is the parent. */ | |
905 | /* The parent just exits. */ | |
906 | exit(0); | |
907 | } | |
908 | /* The child continues serving connections. */ | |
c6940381 | 909 | if (compat20) { |
910 | buffer_append(bin, "\004", 1); | |
911 | /* fake EOF on stdin */ | |
912 | return -1; | |
913 | } else if (!stdin_eof) { | |
914 | /* | |
915 | * Sending SSH_CMSG_EOF alone does not always appear | |
916 | * to be enough. So we try to send an EOF character | |
917 | * first. | |
918 | */ | |
919 | packet_start(SSH_CMSG_STDIN_DATA); | |
920 | packet_put_string("\004", 1); | |
921 | packet_send(); | |
922 | /* Close stdin. */ | |
923 | stdin_eof = 1; | |
924 | if (buffer_len(bin) == 0) { | |
925 | packet_start(SSH_CMSG_EOF); | |
926 | packet_send(); | |
927 | } | |
928 | } | |
929 | continue; | |
2e73a022 | 930 | |
931 | case '?': | |
932 | snprintf(string, sizeof string, | |
933 | "%c?\r\n\ | |
934 | Supported escape sequences:\r\n\ | |
1d77f8cb | 935 | %c. - terminate connection\r\n\ |
16a79097 | 936 | %cB - send a BREAK to the remote system\r\n\ |
1d77f8cb | 937 | %cC - open a command line\r\n\ |
938 | %cR - Request rekey (SSH protocol 2 only)\r\n\ | |
939 | %c^Z - suspend ssh\r\n\ | |
940 | %c# - list forwarded connections\r\n\ | |
941 | %c& - background ssh (when waiting for connections to terminate)\r\n\ | |
942 | %c? - this message\r\n\ | |
943 | %c%c - send the escape character by typing it twice\r\n\ | |
2e73a022 | 944 | (Note that escapes are only recognized immediately after newline.)\r\n", |
1d77f8cb | 945 | escape_char, escape_char, escape_char, escape_char, |
946 | escape_char, escape_char, escape_char, escape_char, | |
16a79097 | 947 | escape_char, escape_char, escape_char); |
2e73a022 | 948 | buffer_append(berr, string, strlen(string)); |
949 | continue; | |
950 | ||
951 | case '#': | |
952 | snprintf(string, sizeof string, "%c#\r\n", escape_char); | |
953 | buffer_append(berr, string, strlen(string)); | |
954 | s = channel_open_message(); | |
955 | buffer_append(berr, s, strlen(s)); | |
956 | xfree(s); | |
957 | continue; | |
958 | ||
c53c54c2 | 959 | case 'C': |
ec9b7086 | 960 | process_cmdline(); |
c53c54c2 | 961 | continue; |
962 | ||
2e73a022 | 963 | default: |
964 | if (ch != escape_char) { | |
965 | buffer_put_char(bin, escape_char); | |
966 | bytes++; | |
967 | } | |
968 | /* Escaped characters fall through here */ | |
969 | break; | |
970 | } | |
971 | } else { | |
972 | /* | |
973 | * The previous character was not an escape char. Check if this | |
974 | * is an escape. | |
975 | */ | |
976 | if (last_was_cr && ch == escape_char) { | |
977 | /* It is. Set the flag and continue to next character. */ | |
978 | escape_pending = 1; | |
979 | continue; | |
980 | } | |
981 | } | |
982 | ||
983 | /* | |
984 | * Normal character. Record whether it was a newline, | |
985 | * and append it to the buffer. | |
986 | */ | |
987 | last_was_cr = (ch == '\r' || ch == '\n'); | |
988 | buffer_put_char(bin, ch); | |
989 | bytes++; | |
990 | } | |
991 | return bytes; | |
992 | } | |
993 | ||
396c147e | 994 | static void |
b476adfa | 995 | client_process_input(fd_set *readset) |
8ce64345 | 996 | { |
9da5c3c9 | 997 | int len; |
2e73a022 | 998 | char buf[8192]; |
8ce64345 | 999 | |
5260325f | 1000 | /* Read input from stdin. */ |
1001 | if (FD_ISSET(fileno(stdin), readset)) { | |
1002 | /* Read as much as possible. */ | |
1003 | len = read(fileno(stdin), buf, sizeof(buf)); | |
cf6bc93c | 1004 | if (len < 0 && (errno == EAGAIN || errno == EINTR)) |
1005 | return; /* we'll try again later */ | |
5260325f | 1006 | if (len <= 0) { |
aa3378df | 1007 | /* |
1008 | * Received EOF or error. They are treated | |
1009 | * similarly, except that an error message is printed | |
1010 | * if it was an error condition. | |
1011 | */ | |
5260325f | 1012 | if (len < 0) { |
1013 | snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno)); | |
1014 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
5260325f | 1015 | } |
1016 | /* Mark that we have seen EOF. */ | |
1017 | stdin_eof = 1; | |
aa3378df | 1018 | /* |
1019 | * Send an EOF message to the server unless there is | |
1020 | * data in the buffer. If there is data in the | |
1021 | * buffer, no message will be sent now. Code | |
1022 | * elsewhere will send the EOF when the buffer | |
1023 | * becomes empty if stdin_eof is set. | |
1024 | */ | |
5260325f | 1025 | if (buffer_len(&stdin_buffer) == 0) { |
8efc0c15 | 1026 | packet_start(SSH_CMSG_EOF); |
1027 | packet_send(); | |
5260325f | 1028 | } |
4bf9c10e | 1029 | } else if (escape_char == SSH_ESCAPECHAR_NONE) { |
aa3378df | 1030 | /* |
1031 | * Normal successful read, and no escape character. | |
1032 | * Just append the data to buffer. | |
1033 | */ | |
5260325f | 1034 | buffer_append(&stdin_buffer, buf, len); |
5260325f | 1035 | } else { |
aa3378df | 1036 | /* |
1037 | * Normal, successful read. But we have an escape character | |
1038 | * and have to process the characters one by one. | |
1039 | */ | |
7e8911cd | 1040 | if (process_escapes(&stdin_buffer, &stdout_buffer, |
1041 | &stderr_buffer, buf, len) == -1) | |
2e73a022 | 1042 | return; |
5260325f | 1043 | } |
1044 | } | |
8efc0c15 | 1045 | } |
1046 | ||
396c147e | 1047 | static void |
b476adfa | 1048 | client_process_output(fd_set *writeset) |
8efc0c15 | 1049 | { |
5260325f | 1050 | int len; |
1051 | char buf[100]; | |
1052 | ||
1053 | /* Write buffered output to stdout. */ | |
1054 | if (FD_ISSET(fileno(stdout), writeset)) { | |
1055 | /* Write as much data as possible. */ | |
1056 | len = write(fileno(stdout), buffer_ptr(&stdout_buffer), | |
a408af76 | 1057 | buffer_len(&stdout_buffer)); |
5260325f | 1058 | if (len <= 0) { |
cf6bc93c | 1059 | if (errno == EINTR || errno == EAGAIN) |
5260325f | 1060 | len = 0; |
1061 | else { | |
aa3378df | 1062 | /* |
1063 | * An error or EOF was encountered. Put an | |
1064 | * error message to stderr buffer. | |
1065 | */ | |
5260325f | 1066 | snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno)); |
1067 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
5260325f | 1068 | quit_pending = 1; |
1069 | return; | |
1070 | } | |
1071 | } | |
1072 | /* Consume printed data from the buffer. */ | |
1073 | buffer_consume(&stdout_buffer, len); | |
cd332296 | 1074 | stdout_bytes += len; |
5260325f | 1075 | } |
1076 | /* Write buffered output to stderr. */ | |
1077 | if (FD_ISSET(fileno(stderr), writeset)) { | |
1078 | /* Write as much data as possible. */ | |
1079 | len = write(fileno(stderr), buffer_ptr(&stderr_buffer), | |
a408af76 | 1080 | buffer_len(&stderr_buffer)); |
5260325f | 1081 | if (len <= 0) { |
cf6bc93c | 1082 | if (errno == EINTR || errno == EAGAIN) |
5260325f | 1083 | len = 0; |
1084 | else { | |
aa3378df | 1085 | /* EOF or error, but can't even print error message. */ |
5260325f | 1086 | quit_pending = 1; |
1087 | return; | |
1088 | } | |
1089 | } | |
1090 | /* Consume printed characters from the buffer. */ | |
1091 | buffer_consume(&stderr_buffer, len); | |
cd332296 | 1092 | stderr_bytes += len; |
8efc0c15 | 1093 | } |
8efc0c15 | 1094 | } |
1095 | ||
7368a6c8 | 1096 | /* |
1097 | * Get packets from the connection input buffer, and process them as long as | |
1098 | * there are packets available. | |
1099 | * | |
1100 | * Any unknown packets received during the actual | |
1101 | * session cause the session to terminate. This is | |
1102 | * intended to make debugging easier since no | |
1103 | * confirmations are sent. Any compatible protocol | |
1104 | * extensions must be negotiated during the | |
1105 | * preparatory phase. | |
1106 | */ | |
1107 | ||
396c147e | 1108 | static void |
5ca51e19 | 1109 | client_process_buffered_input_packets(void) |
7368a6c8 | 1110 | { |
e092ce67 | 1111 | dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL); |
7368a6c8 | 1112 | } |
1113 | ||
2e73a022 | 1114 | /* scan buf[] for '~' before sending data to the peer */ |
1115 | ||
396c147e | 1116 | static int |
2e73a022 | 1117 | simple_escape_filter(Channel *c, char *buf, int len) |
1118 | { | |
95d3c124 | 1119 | if (c->extended_usage != CHAN_EXTENDED_WRITE) |
1120 | return 0; | |
1121 | ||
2e73a022 | 1122 | return process_escapes(&c->input, &c->output, &c->extended, buf, len); |
1123 | } | |
1124 | ||
396c147e | 1125 | static void |
eb0dd41f | 1126 | client_channel_closed(int id, void *arg) |
1127 | { | |
418e724c | 1128 | channel_cancel_cleanup(id); |
eb0dd41f | 1129 | session_closed = 1; |
82de775c | 1130 | leave_raw_mode(); |
eb0dd41f | 1131 | } |
1132 | ||
aa3378df | 1133 | /* |
1134 | * Implements the interactive session with the server. This is called after | |
1135 | * the user has been authenticated, and a command has been started on the | |
4bf9c10e | 1136 | * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character |
1137 | * used as an escape character for terminating or suspending the session. | |
aa3378df | 1138 | */ |
8efc0c15 | 1139 | |
6ae2364d | 1140 | int |
2e73a022 | 1141 | client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id) |
8efc0c15 | 1142 | { |
39929cdb | 1143 | fd_set *readset = NULL, *writeset = NULL; |
5260325f | 1144 | double start_time, total_time; |
9a995072 | 1145 | int max_fd = 0, max_fd2 = 0, len, rekeying = 0; |
1146 | u_int nalloc = 0; | |
5260325f | 1147 | char buf[100]; |
1148 | ||
1149 | debug("Entering interactive session."); | |
1150 | ||
1151 | start_time = get_current_time(); | |
1152 | ||
1153 | /* Initialize variables. */ | |
1154 | escape_pending = 0; | |
1155 | last_was_cr = 1; | |
1156 | exit_status = -1; | |
1157 | stdin_eof = 0; | |
1158 | buffer_high = 64 * 1024; | |
1159 | connection_in = packet_get_connection_in(); | |
1160 | connection_out = packet_get_connection_out(); | |
39929cdb | 1161 | max_fd = MAX(connection_in, connection_out); |
3bcced4c | 1162 | if (muxserver_sock != -1) |
1163 | max_fd = MAX(max_fd, muxserver_sock); | |
39929cdb | 1164 | |
1165 | if (!compat20) { | |
e968270c | 1166 | /* enable nonblocking unless tty */ |
1167 | if (!isatty(fileno(stdin))) | |
1168 | set_nonblock(fileno(stdin)); | |
1169 | if (!isatty(fileno(stdout))) | |
1170 | set_nonblock(fileno(stdout)); | |
1171 | if (!isatty(fileno(stderr))) | |
1172 | set_nonblock(fileno(stderr)); | |
39929cdb | 1173 | max_fd = MAX(max_fd, fileno(stdin)); |
1174 | max_fd = MAX(max_fd, fileno(stdout)); | |
1175 | max_fd = MAX(max_fd, fileno(stderr)); | |
1176 | } | |
5260325f | 1177 | stdin_bytes = 0; |
1178 | stdout_bytes = 0; | |
1179 | stderr_bytes = 0; | |
1180 | quit_pending = 0; | |
1181 | escape_char = escape_char_arg; | |
1182 | ||
1183 | /* Initialize buffers. */ | |
1184 | buffer_init(&stdin_buffer); | |
1185 | buffer_init(&stdout_buffer); | |
1186 | buffer_init(&stderr_buffer); | |
1187 | ||
7368a6c8 | 1188 | client_init_dispatch(); |
1189 | ||
3c93c917 | 1190 | /* |
1191 | * Set signal handlers, (e.g. to restore non-blocking mode) | |
1192 | * but don't overwrite SIG_IGN, matches behaviour from rsh(1) | |
1193 | */ | |
d3e5d1e9 | 1194 | if (signal(SIGHUP, SIG_IGN) != SIG_IGN) |
1195 | signal(SIGHUP, signal_handler); | |
3c93c917 | 1196 | if (signal(SIGINT, SIG_IGN) != SIG_IGN) |
1197 | signal(SIGINT, signal_handler); | |
1198 | if (signal(SIGQUIT, SIG_IGN) != SIG_IGN) | |
1199 | signal(SIGQUIT, signal_handler); | |
1200 | if (signal(SIGTERM, SIG_IGN) != SIG_IGN) | |
1201 | signal(SIGTERM, signal_handler); | |
2c9a4d41 | 1202 | signal(SIGWINCH, window_change_handler); |
5260325f | 1203 | |
5260325f | 1204 | if (have_pty) |
1205 | enter_raw_mode(); | |
1206 | ||
1fc8ccdf | 1207 | if (compat20) { |
1208 | session_ident = ssh2_chan_id; | |
4bf9c10e | 1209 | if (escape_char != SSH_ESCAPECHAR_NONE) |
1fc8ccdf | 1210 | channel_register_filter(session_ident, |
c1c6a032 | 1211 | simple_escape_filter, NULL); |
eb0dd41f | 1212 | if (session_ident != -1) |
1213 | channel_register_cleanup(session_ident, | |
8cd0437d | 1214 | client_channel_closed, 0); |
1fc8ccdf | 1215 | } else { |
1216 | /* Check if we should immediately send eof on stdin. */ | |
8ce64345 | 1217 | client_check_initial_eof_on_stdin(); |
1fc8ccdf | 1218 | } |
2e73a022 | 1219 | |
5260325f | 1220 | /* Main loop of the client for the interactive session mode. */ |
1221 | while (!quit_pending) { | |
5260325f | 1222 | |
aa3378df | 1223 | /* Process buffered packets sent by the server. */ |
5260325f | 1224 | client_process_buffered_input_packets(); |
1225 | ||
eb0dd41f | 1226 | if (compat20 && session_closed && !channel_still_open()) |
8ce64345 | 1227 | break; |
eb0dd41f | 1228 | |
1229 | rekeying = (xxx_kex != NULL && !xxx_kex->done); | |
8ce64345 | 1230 | |
c422989b | 1231 | if (rekeying) { |
1232 | debug("rekeying in progress"); | |
1233 | } else { | |
1234 | /* | |
1235 | * Make packets of buffered stdin data, and buffer | |
1236 | * them for sending to the server. | |
1237 | */ | |
1238 | if (!compat20) | |
1239 | client_make_packets_from_stdin_data(); | |
5260325f | 1240 | |
c422989b | 1241 | /* |
1242 | * Make packets from buffered channel data, and | |
1243 | * enqueue them for sending to the server. | |
1244 | */ | |
1245 | if (packet_not_very_much_data_to_write()) | |
1246 | channel_output_poll(); | |
5260325f | 1247 | |
c422989b | 1248 | /* |
1249 | * Check if the window size has changed, and buffer a | |
1250 | * message about it to the server if so. | |
1251 | */ | |
1252 | client_check_window_change(); | |
5260325f | 1253 | |
c422989b | 1254 | if (quit_pending) |
1255 | break; | |
1256 | } | |
aa3378df | 1257 | /* |
1258 | * Wait until we have something to do (something becomes | |
1259 | * available on one of the descriptors). | |
1260 | */ | |
489aa2e9 | 1261 | max_fd2 = max_fd; |
c422989b | 1262 | client_wait_until_can_do_something(&readset, &writeset, |
489aa2e9 | 1263 | &max_fd2, &nalloc, rekeying); |
5260325f | 1264 | |
1265 | if (quit_pending) | |
1266 | break; | |
1267 | ||
c422989b | 1268 | /* Do channel operations unless rekeying in progress. */ |
1269 | if (!rekeying) { | |
1270 | channel_after_select(readset, writeset); | |
ffd7b36b | 1271 | if (need_rekeying || packet_need_rekeying()) { |
1272 | debug("need rekeying"); | |
c422989b | 1273 | xxx_kex->done = 0; |
1274 | kex_send_kexinit(xxx_kex); | |
1275 | need_rekeying = 0; | |
1276 | } | |
1277 | } | |
5260325f | 1278 | |
8ce64345 | 1279 | /* Buffer input from the connection. */ |
39929cdb | 1280 | client_process_net_input(readset); |
5260325f | 1281 | |
5e96b616 | 1282 | /* Accept control connections. */ |
3bcced4c | 1283 | if (muxserver_sock != -1 &&FD_ISSET(muxserver_sock, readset)) { |
1284 | if (muxserver_accept_control()) | |
1285 | quit_pending = 1; | |
1286 | } | |
5e96b616 | 1287 | |
8ce64345 | 1288 | if (quit_pending) |
1289 | break; | |
1290 | ||
1291 | if (!compat20) { | |
1292 | /* Buffer data from stdin */ | |
39929cdb | 1293 | client_process_input(readset); |
8ce64345 | 1294 | /* |
1295 | * Process output to stdout and stderr. Output to | |
1296 | * the connection is processed elsewhere (above). | |
1297 | */ | |
39929cdb | 1298 | client_process_output(writeset); |
8ce64345 | 1299 | } |
5260325f | 1300 | |
aa3378df | 1301 | /* Send as much buffered packet data as possible to the sender. */ |
39929cdb | 1302 | if (FD_ISSET(connection_out, writeset)) |
5260325f | 1303 | packet_write_poll(); |
1304 | } | |
39929cdb | 1305 | if (readset) |
1306 | xfree(readset); | |
1307 | if (writeset) | |
1308 | xfree(writeset); | |
5260325f | 1309 | |
1310 | /* Terminate the session. */ | |
1311 | ||
1312 | /* Stop watching for window change. */ | |
2c9a4d41 | 1313 | signal(SIGWINCH, SIG_DFL); |
5260325f | 1314 | |
d6746a0b | 1315 | channel_free_all(); |
5260325f | 1316 | |
c9130033 | 1317 | if (have_pty) |
1318 | leave_raw_mode(); | |
89aa792b | 1319 | |
1320 | /* restore blocking io */ | |
1321 | if (!isatty(fileno(stdin))) | |
1322 | unset_nonblock(fileno(stdin)); | |
1323 | if (!isatty(fileno(stdout))) | |
1324 | unset_nonblock(fileno(stdout)); | |
1325 | if (!isatty(fileno(stderr))) | |
1326 | unset_nonblock(fileno(stderr)); | |
1327 | ||
66357af5 | 1328 | /* |
1329 | * If there was no shell or command requested, there will be no remote | |
1330 | * exit status to be returned. In that case, clear error code if the | |
1331 | * connection was deliberately terminated at this end. | |
1332 | */ | |
1333 | if (no_shell_flag && received_signal == SIGTERM) { | |
1334 | received_signal = 0; | |
1335 | exit_status = 0; | |
1336 | } | |
1337 | ||
82de775c | 1338 | if (received_signal) |
010f9726 | 1339 | fatal("Killed by signal %d.", (int) received_signal); |
c9130033 | 1340 | |
1341 | /* | |
1342 | * In interactive mode (with pseudo tty) display a message indicating | |
1343 | * that the connection has been closed. | |
1344 | */ | |
1345 | if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) { | |
1346 | snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host); | |
1347 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
1348 | } | |
1349 | ||
5260325f | 1350 | /* Output any buffered data for stdout. */ |
89aa792b | 1351 | while (buffer_len(&stdout_buffer) > 0) { |
1352 | len = write(fileno(stdout), buffer_ptr(&stdout_buffer), | |
a408af76 | 1353 | buffer_len(&stdout_buffer)); |
89aa792b | 1354 | if (len <= 0) { |
5260325f | 1355 | error("Write failed flushing stdout buffer."); |
89aa792b | 1356 | break; |
1357 | } | |
5260325f | 1358 | buffer_consume(&stdout_buffer, len); |
cd332296 | 1359 | stdout_bytes += len; |
8efc0c15 | 1360 | } |
5260325f | 1361 | |
1362 | /* Output any buffered data for stderr. */ | |
89aa792b | 1363 | while (buffer_len(&stderr_buffer) > 0) { |
1364 | len = write(fileno(stderr), buffer_ptr(&stderr_buffer), | |
a408af76 | 1365 | buffer_len(&stderr_buffer)); |
89aa792b | 1366 | if (len <= 0) { |
5260325f | 1367 | error("Write failed flushing stderr buffer."); |
89aa792b | 1368 | break; |
1369 | } | |
5260325f | 1370 | buffer_consume(&stderr_buffer, len); |
cd332296 | 1371 | stderr_bytes += len; |
5260325f | 1372 | } |
1373 | ||
5260325f | 1374 | /* Clear and free any buffers. */ |
1375 | memset(buf, 0, sizeof(buf)); | |
1376 | buffer_free(&stdin_buffer); | |
1377 | buffer_free(&stdout_buffer); | |
1378 | buffer_free(&stderr_buffer); | |
1379 | ||
1380 | /* Report bytes transferred, and transfer rates. */ | |
1381 | total_time = get_current_time() - start_time; | |
1382 | debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds", | |
184eed6a | 1383 | stdin_bytes, stdout_bytes, stderr_bytes, total_time); |
5260325f | 1384 | if (total_time > 0) |
1385 | debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f", | |
184eed6a | 1386 | stdin_bytes / total_time, stdout_bytes / total_time, |
1387 | stderr_bytes / total_time); | |
5260325f | 1388 | |
1389 | /* Return the exit status of the program. */ | |
1390 | debug("Exit status %d", exit_status); | |
1391 | return exit_status; | |
8efc0c15 | 1392 | } |
7368a6c8 | 1393 | |
1394 | /*********/ | |
1395 | ||
396c147e | 1396 | static void |
7819b5c3 | 1397 | client_input_stdout_data(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 1398 | { |
1e3b8b07 | 1399 | u_int data_len; |
7368a6c8 | 1400 | char *data = packet_get_string(&data_len); |
95500969 | 1401 | packet_check_eom(); |
7368a6c8 | 1402 | buffer_append(&stdout_buffer, data, data_len); |
7368a6c8 | 1403 | memset(data, 0, data_len); |
1404 | xfree(data); | |
1405 | } | |
396c147e | 1406 | static void |
7819b5c3 | 1407 | client_input_stderr_data(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 1408 | { |
1e3b8b07 | 1409 | u_int data_len; |
7368a6c8 | 1410 | char *data = packet_get_string(&data_len); |
95500969 | 1411 | packet_check_eom(); |
7368a6c8 | 1412 | buffer_append(&stderr_buffer, data, data_len); |
7368a6c8 | 1413 | memset(data, 0, data_len); |
1414 | xfree(data); | |
1415 | } | |
396c147e | 1416 | static void |
7819b5c3 | 1417 | client_input_exit_status(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 1418 | { |
7368a6c8 | 1419 | exit_status = packet_get_int(); |
95500969 | 1420 | packet_check_eom(); |
7368a6c8 | 1421 | /* Acknowledge the exit. */ |
1422 | packet_start(SSH_CMSG_EXIT_CONFIRMATION); | |
1423 | packet_send(); | |
1424 | /* | |
1425 | * Must wait for packet to be sent since we are | |
1426 | * exiting the loop. | |
1427 | */ | |
1428 | packet_write_wait(); | |
1429 | /* Flag that we want to exit. */ | |
1430 | quit_pending = 1; | |
1431 | } | |
c15706e2 | 1432 | static void |
1433 | client_input_agent_open(int type, u_int32_t seq, void *ctxt) | |
1434 | { | |
1435 | Channel *c = NULL; | |
1436 | int remote_id, sock; | |
1437 | ||
1438 | /* Read the remote channel number from the message. */ | |
1439 | remote_id = packet_get_int(); | |
1440 | packet_check_eom(); | |
1441 | ||
1442 | /* | |
1443 | * Get a connection to the local authentication agent (this may again | |
1444 | * get forwarded). | |
1445 | */ | |
1446 | sock = ssh_get_authentication_socket(); | |
1447 | ||
1448 | /* | |
1449 | * If we could not connect the agent, send an error message back to | |
1450 | * the server. This should never happen unless the agent dies, | |
1451 | * because authentication forwarding is only enabled if we have an | |
1452 | * agent. | |
1453 | */ | |
1454 | if (sock >= 0) { | |
1455 | c = channel_new("", SSH_CHANNEL_OPEN, sock, sock, | |
1456 | -1, 0, 0, 0, "authentication agent connection", 1); | |
1457 | c->remote_id = remote_id; | |
1458 | c->force_drain = 1; | |
1459 | } | |
1460 | if (c == NULL) { | |
1461 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
1462 | packet_put_int(remote_id); | |
1463 | } else { | |
1464 | /* Send a confirmation to the remote host. */ | |
1465 | debug("Forwarding authentication connection."); | |
1466 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1467 | packet_put_int(remote_id); | |
1468 | packet_put_int(c->self); | |
1469 | } | |
1470 | packet_send(); | |
1471 | } | |
7368a6c8 | 1472 | |
396c147e | 1473 | static Channel * |
fa08c86b | 1474 | client_request_forwarded_tcpip(const char *request_type, int rchan) |
1475 | { | |
343288b8 | 1476 | Channel *c = NULL; |
fa08c86b | 1477 | char *listen_address, *originator_address; |
1478 | int listen_port, originator_port; | |
fa08c86b | 1479 | |
1480 | /* Get rest of the packet */ | |
1481 | listen_address = packet_get_string(NULL); | |
1482 | listen_port = packet_get_int(); | |
1483 | originator_address = packet_get_string(NULL); | |
1484 | originator_port = packet_get_int(); | |
95500969 | 1485 | packet_check_eom(); |
fa08c86b | 1486 | |
e07e21ad | 1487 | debug("client_request_forwarded_tcpip: listen %s port %d, " |
1488 | "originator %s port %d", listen_address, listen_port, | |
1489 | originator_address, originator_port); | |
1490 | ||
1491 | c = channel_connect_by_listen_address(listen_port, | |
1492 | "forwarded-tcpip", originator_address); | |
fa08c86b | 1493 | |
fa08c86b | 1494 | xfree(originator_address); |
1495 | xfree(listen_address); | |
1496 | return c; | |
1497 | } | |
1498 | ||
343288b8 | 1499 | static Channel * |
fa08c86b | 1500 | client_request_x11(const char *request_type, int rchan) |
1501 | { | |
1502 | Channel *c = NULL; | |
1503 | char *originator; | |
1504 | int originator_port; | |
719fc62f | 1505 | int sock; |
fa08c86b | 1506 | |
1507 | if (!options.forward_x11) { | |
1508 | error("Warning: ssh server tried X11 forwarding."); | |
1908529f | 1509 | error("Warning: this is probably a break-in attempt by a malicious server."); |
fa08c86b | 1510 | return NULL; |
1511 | } | |
1512 | originator = packet_get_string(NULL); | |
1513 | if (datafellows & SSH_BUG_X11FWD) { | |
1514 | debug2("buggy server: x11 request w/o originator_port"); | |
1515 | originator_port = 0; | |
1516 | } else { | |
1517 | originator_port = packet_get_int(); | |
1518 | } | |
95500969 | 1519 | packet_check_eom(); |
fa08c86b | 1520 | /* XXX check permission */ |
865ac82e | 1521 | debug("client_request_x11: request from %s %d", originator, |
1522 | originator_port); | |
719fc62f | 1523 | xfree(originator); |
fa08c86b | 1524 | sock = x11_connect_display(); |
719fc62f | 1525 | if (sock < 0) |
1526 | return NULL; | |
1527 | c = channel_new("x11", | |
1528 | SSH_CHANNEL_X11_OPEN, sock, sock, -1, | |
0d942eff | 1529 | CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1); |
a5f82435 | 1530 | c->force_drain = 1; |
fa08c86b | 1531 | return c; |
1532 | } | |
1533 | ||
343288b8 | 1534 | static Channel * |
fa08c86b | 1535 | client_request_agent(const char *request_type, int rchan) |
1536 | { | |
1537 | Channel *c = NULL; | |
719fc62f | 1538 | int sock; |
fa08c86b | 1539 | |
1540 | if (!options.forward_agent) { | |
1541 | error("Warning: ssh server tried agent forwarding."); | |
1908529f | 1542 | error("Warning: this is probably a break-in attempt by a malicious server."); |
fa08c86b | 1543 | return NULL; |
1544 | } | |
803c4226 | 1545 | sock = ssh_get_authentication_socket(); |
719fc62f | 1546 | if (sock < 0) |
1547 | return NULL; | |
1548 | c = channel_new("authentication agent connection", | |
1549 | SSH_CHANNEL_OPEN, sock, sock, -1, | |
016f1482 | 1550 | CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, |
0d942eff | 1551 | "authentication agent connection", 1); |
a5f82435 | 1552 | c->force_drain = 1; |
fa08c86b | 1553 | return c; |
1554 | } | |
1555 | ||
79303c5a | 1556 | int |
1557 | client_request_tun_fwd(int tun_mode, int local_tun, int remote_tun) | |
1558 | { | |
1559 | Channel *c; | |
1560 | int fd; | |
1561 | ||
1562 | if (tun_mode == SSH_TUNMODE_NO) | |
1563 | return 0; | |
1564 | ||
1565 | if (!compat20) { | |
1566 | error("Tunnel forwarding is not support for protocol 1"); | |
1567 | return -1; | |
1568 | } | |
1569 | ||
1570 | debug("Requesting tun unit %d in mode %d", local_tun, tun_mode); | |
1571 | ||
1572 | /* Open local tunnel device */ | |
1573 | if ((fd = tun_open(local_tun, tun_mode)) == -1) { | |
1574 | error("Tunnel device open failed."); | |
1575 | return -1; | |
1576 | } | |
1577 | ||
1578 | c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1, | |
1579 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1); | |
1580 | c->datagram = 1; | |
1581 | ||
1582 | #if defined(SSH_TUN_FILTER) | |
1583 | if (options.tun_open == SSH_TUNMODE_POINTOPOINT) | |
1584 | channel_register_filter(c->self, sys_tun_infilter, | |
1585 | sys_tun_outfilter); | |
1586 | #endif | |
1587 | ||
1588 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1589 | packet_put_cstring("tun@openssh.com"); | |
1590 | packet_put_int(c->self); | |
1591 | packet_put_int(c->local_window_max); | |
1592 | packet_put_int(c->local_maxpacket); | |
1593 | packet_put_int(tun_mode); | |
1594 | packet_put_int(remote_tun); | |
1595 | packet_send(); | |
1596 | ||
1597 | return 0; | |
1598 | } | |
1599 | ||
0b242b12 | 1600 | /* XXXX move to generic input handler */ |
396c147e | 1601 | static void |
7819b5c3 | 1602 | client_input_channel_open(int type, u_int32_t seq, void *ctxt) |
0b242b12 | 1603 | { |
1604 | Channel *c = NULL; | |
1605 | char *ctype; | |
0b242b12 | 1606 | int rchan; |
f91d9a89 | 1607 | u_int rmaxpack, rwindow, len; |
0b242b12 | 1608 | |
1609 | ctype = packet_get_string(&len); | |
1610 | rchan = packet_get_int(); | |
1611 | rwindow = packet_get_int(); | |
1612 | rmaxpack = packet_get_int(); | |
1613 | ||
1d1ffb87 | 1614 | debug("client_input_channel_open: ctype %s rchan %d win %d max %d", |
0b242b12 | 1615 | ctype, rchan, rwindow, rmaxpack); |
1616 | ||
fa08c86b | 1617 | if (strcmp(ctype, "forwarded-tcpip") == 0) { |
1618 | c = client_request_forwarded_tcpip(ctype, rchan); | |
1619 | } else if (strcmp(ctype, "x11") == 0) { | |
1620 | c = client_request_x11(ctype, rchan); | |
1621 | } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) { | |
1622 | c = client_request_agent(ctype, rchan); | |
0b242b12 | 1623 | } |
1624 | /* XXX duplicate : */ | |
1625 | if (c != NULL) { | |
1626 | debug("confirm %s", ctype); | |
1627 | c->remote_id = rchan; | |
1628 | c->remote_window = rwindow; | |
1629 | c->remote_maxpacket = rmaxpack; | |
a01a10dd | 1630 | if (c->type != SSH_CHANNEL_CONNECTING) { |
1631 | packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1632 | packet_put_int(c->remote_id); | |
1633 | packet_put_int(c->self); | |
1634 | packet_put_int(c->local_window); | |
1635 | packet_put_int(c->local_maxpacket); | |
1636 | packet_send(); | |
1637 | } | |
0b242b12 | 1638 | } else { |
1639 | debug("failure %s", ctype); | |
1640 | packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); | |
1641 | packet_put_int(rchan); | |
1642 | packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED); | |
fbe90f7b | 1643 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { |
a01a10dd | 1644 | packet_put_cstring("open failed"); |
fbe90f7b | 1645 | packet_put_cstring(""); |
1646 | } | |
0b242b12 | 1647 | packet_send(); |
1648 | } | |
1649 | xfree(ctype); | |
1650 | } | |
396c147e | 1651 | static void |
7819b5c3 | 1652 | client_input_channel_req(int type, u_int32_t seq, void *ctxt) |
1fc8ccdf | 1653 | { |
1654 | Channel *c = NULL; | |
5e96b616 | 1655 | int exitval, id, reply, success = 0; |
1fc8ccdf | 1656 | char *rtype; |
1657 | ||
1658 | id = packet_get_int(); | |
1659 | rtype = packet_get_string(NULL); | |
1660 | reply = packet_get_char(); | |
1661 | ||
1662 | debug("client_input_channel_req: channel %d rtype %s reply %d", | |
1663 | id, rtype, reply); | |
1664 | ||
13de3560 | 1665 | if (id == -1) { |
1666 | error("client_input_channel_req: request for channel -1"); | |
1667 | } else if ((c = channel_lookup(id)) == NULL) { | |
1fc8ccdf | 1668 | error("client_input_channel_req: channel %d: unknown channel", id); |
50c96367 | 1669 | } else if (strcmp(rtype, "eow@openssh.com") == 0) { |
1670 | packet_check_eom(); | |
1671 | chan_rcvd_eow(c); | |
1fc8ccdf | 1672 | } else if (strcmp(rtype, "exit-status") == 0) { |
5e96b616 | 1673 | exitval = packet_get_int(); |
1674 | if (id == session_ident) { | |
1675 | success = 1; | |
1676 | exit_status = exitval; | |
1677 | } else if (c->ctl_fd == -1) { | |
1678 | error("client_input_channel_req: unexpected channel %d", | |
1679 | session_ident); | |
1680 | } else { | |
1681 | atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval)); | |
1682 | success = 1; | |
1683 | } | |
95500969 | 1684 | packet_check_eom(); |
1fc8ccdf | 1685 | } |
1686 | if (reply) { | |
1687 | packet_start(success ? | |
1688 | SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE); | |
13de3560 | 1689 | packet_put_int(id); |
1fc8ccdf | 1690 | packet_send(); |
1691 | } | |
1692 | xfree(rtype); | |
1693 | } | |
3d209bbe | 1694 | static void |
1695 | client_input_global_request(int type, u_int32_t seq, void *ctxt) | |
1696 | { | |
1697 | char *rtype; | |
1698 | int want_reply; | |
1699 | int success = 0; | |
1700 | ||
1701 | rtype = packet_get_string(NULL); | |
1702 | want_reply = packet_get_char(); | |
5d8d32a3 | 1703 | debug("client_input_global_request: rtype %s want_reply %d", |
1704 | rtype, want_reply); | |
3d209bbe | 1705 | if (want_reply) { |
1706 | packet_start(success ? | |
1707 | SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE); | |
1708 | packet_send(); | |
1709 | packet_write_wait(); | |
1710 | } | |
1711 | xfree(rtype); | |
1712 | } | |
0b242b12 | 1713 | |
5e96b616 | 1714 | void |
f2107e97 | 1715 | client_session2_setup(int id, int want_tty, int want_subsystem, |
95d3c124 | 1716 | const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env) |
5e96b616 | 1717 | { |
1718 | int len; | |
2c9a4d41 | 1719 | Channel *c = NULL; |
5e96b616 | 1720 | |
1721 | debug2("%s: id %d", __func__, id); | |
1722 | ||
2c9a4d41 | 1723 | if ((c = channel_lookup(id)) == NULL) |
1724 | fatal("client_session2_setup: channel %d: unknown channel", id); | |
1725 | ||
5e96b616 | 1726 | if (want_tty) { |
1727 | struct winsize ws; | |
1728 | struct termios tio; | |
1729 | ||
1730 | /* Store window size in the packet. */ | |
1731 | if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0) | |
1732 | memset(&ws, 0, sizeof(ws)); | |
1733 | ||
95d3c124 | 1734 | channel_request_start(id, "pty-req", 1); |
1735 | client_expect_confirm(id, "PTY allocation", 0); | |
5e96b616 | 1736 | packet_put_cstring(term != NULL ? term : ""); |
148de80c | 1737 | packet_put_int((u_int)ws.ws_col); |
1738 | packet_put_int((u_int)ws.ws_row); | |
1739 | packet_put_int((u_int)ws.ws_xpixel); | |
1740 | packet_put_int((u_int)ws.ws_ypixel); | |
5e96b616 | 1741 | tio = get_saved_tio(); |
1742 | tty_make_modes(-1, tiop != NULL ? tiop : &tio); | |
1743 | packet_send(); | |
1744 | /* XXX wait for reply */ | |
2c9a4d41 | 1745 | c->client_tty = 1; |
5e96b616 | 1746 | } |
1747 | ||
1748 | /* Transfer any environment variables from client to server */ | |
1786be35 | 1749 | if (options.num_send_env != 0 && env != NULL) { |
5e96b616 | 1750 | int i, j, matched; |
5e96b616 | 1751 | char *name, *val; |
1752 | ||
1753 | debug("Sending environment."); | |
1786be35 | 1754 | for (i = 0; env[i] != NULL; i++) { |
5e96b616 | 1755 | /* Split */ |
1786be35 | 1756 | name = xstrdup(env[i]); |
5e96b616 | 1757 | if ((val = strchr(name, '=')) == NULL) { |
8c4bd764 | 1758 | xfree(name); |
5e96b616 | 1759 | continue; |
1760 | } | |
1761 | *val++ = '\0'; | |
1762 | ||
1763 | matched = 0; | |
1764 | for (j = 0; j < options.num_send_env; j++) { | |
1765 | if (match_pattern(name, options.send_env[j])) { | |
1766 | matched = 1; | |
1767 | break; | |
1768 | } | |
1769 | } | |
1770 | if (!matched) { | |
1771 | debug3("Ignored env %s", name); | |
8c4bd764 | 1772 | xfree(name); |
5e96b616 | 1773 | continue; |
1774 | } | |
1775 | ||
1776 | debug("Sending env %s = %s", name, val); | |
1777 | channel_request_start(id, "env", 0); | |
1778 | packet_put_cstring(name); | |
1779 | packet_put_cstring(val); | |
1780 | packet_send(); | |
8c4bd764 | 1781 | xfree(name); |
5e96b616 | 1782 | } |
1783 | } | |
1784 | ||
1785 | len = buffer_len(cmd); | |
1786 | if (len > 0) { | |
1787 | if (len > 900) | |
1788 | len = 900; | |
1789 | if (want_subsystem) { | |
95d3c124 | 1790 | debug("Sending subsystem: %.*s", |
1791 | len, (u_char*)buffer_ptr(cmd)); | |
1792 | channel_request_start(id, "subsystem", 1); | |
1793 | client_expect_confirm(id, "subsystem", 1); | |
5e96b616 | 1794 | } else { |
95d3c124 | 1795 | debug("Sending command: %.*s", |
1796 | len, (u_char*)buffer_ptr(cmd)); | |
1797 | channel_request_start(id, "exec", 1); | |
1798 | client_expect_confirm(id, "exec", 1); | |
5e96b616 | 1799 | } |
1800 | packet_put_string(buffer_ptr(cmd), buffer_len(cmd)); | |
1801 | packet_send(); | |
1802 | } else { | |
95d3c124 | 1803 | channel_request_start(id, "shell", 1); |
1804 | client_expect_confirm(id, "shell", 1); | |
5e96b616 | 1805 | packet_send(); |
1806 | } | |
1807 | } | |
1808 | ||
396c147e | 1809 | static void |
5ca51e19 | 1810 | client_init_dispatch_20(void) |
8ce64345 | 1811 | { |
7a37c112 | 1812 | dispatch_init(&dispatch_protocol_error); |
e0ae8728 | 1813 | |
8ce64345 | 1814 | dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose); |
1815 | dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data); | |
1816 | dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof); | |
1817 | dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data); | |
0b242b12 | 1818 | dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open); |
8ce64345 | 1819 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); |
1820 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); | |
1fc8ccdf | 1821 | dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req); |
8ce64345 | 1822 | dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust); |
3593bdc0 | 1823 | dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &channel_input_status_confirm); |
1824 | dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &channel_input_status_confirm); | |
3d209bbe | 1825 | dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request); |
7a37c112 | 1826 | |
1827 | /* rekeying */ | |
1828 | dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit); | |
e0ae8728 | 1829 | |
1830 | /* global request reply messages */ | |
1831 | dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply); | |
1832 | dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply); | |
8ce64345 | 1833 | } |
396c147e | 1834 | static void |
5ca51e19 | 1835 | client_init_dispatch_13(void) |
7368a6c8 | 1836 | { |
1837 | dispatch_init(NULL); | |
1838 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close); | |
1839 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation); | |
1840 | dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data); | |
7368a6c8 | 1841 | dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); |
1842 | dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); | |
1843 | dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open); | |
7368a6c8 | 1844 | dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status); |
1845 | dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data); | |
1846 | dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data); | |
a22aff1f | 1847 | |
1848 | dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ? | |
c15706e2 | 1849 | &client_input_agent_open : &deny_input_open); |
a22aff1f | 1850 | dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ? |
1851 | &x11_input_open : &deny_input_open); | |
7368a6c8 | 1852 | } |
396c147e | 1853 | static void |
5ca51e19 | 1854 | client_init_dispatch_15(void) |
7368a6c8 | 1855 | { |
1856 | client_init_dispatch_13(); | |
1857 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof); | |
1858 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose); | |
1859 | } | |
eea46d13 | 1860 | static void |
5ca51e19 | 1861 | client_init_dispatch(void) |
7368a6c8 | 1862 | { |
8ce64345 | 1863 | if (compat20) |
1864 | client_init_dispatch_20(); | |
1865 | else if (compat13) | |
7368a6c8 | 1866 | client_init_dispatch_13(); |
1867 | else | |
1868 | client_init_dispatch_15(); | |
1869 | } | |
82de775c | 1870 | |
1871 | /* client specific fatal cleanup */ | |
1872 | void | |
2362db19 | 1873 | cleanup_exit(int i) |
82de775c | 1874 | { |
82de775c | 1875 | leave_raw_mode(); |
1876 | leave_non_blocking(); | |
3bcced4c | 1877 | if (options.control_path != NULL && muxserver_sock != -1) |
5e96b616 | 1878 | unlink(options.control_path); |
2362db19 | 1879 | _exit(i); |
82de775c | 1880 | } |