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8efc0c15 | 1 | /* |
5260325f | 2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
5260325f | 3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
4 | * All rights reserved | |
bcbf86ec | 5 | * The main loop for the interactive session (client side). |
6ae2364d | 6 | * |
bcbf86ec | 7 | * As far as I am concerned, the code I have written for this software |
8 | * can be used freely for any purpose. Any derived versions of this | |
9 | * software must be clearly marked as such, and if the derived work is | |
10 | * incompatible with the protocol description in the RFC file, it must be | |
11 | * called by a name other than "ssh" or "Secure Shell". | |
6ae2364d | 12 | * |
6ae2364d | 13 | * |
bcbf86ec | 14 | * Copyright (c) 1999 Theo de Raadt. All rights reserved. |
15 | * | |
16 | * Redistribution and use in source and binary forms, with or without | |
17 | * modification, are permitted provided that the following conditions | |
18 | * are met: | |
19 | * 1. Redistributions of source code must retain the above copyright | |
20 | * notice, this list of conditions and the following disclaimer. | |
21 | * 2. Redistributions in binary form must reproduce the above copyright | |
22 | * notice, this list of conditions and the following disclaimer in the | |
23 | * documentation and/or other materials provided with the distribution. | |
24 | * | |
25 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
26 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
27 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
28 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
29 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
30 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
31 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
32 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
33 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
34 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
35 | * | |
6ae2364d | 36 | * |
8ce64345 | 37 | * SSH2 support added by Markus Friedl. |
bcbf86ec | 38 | * Copyright (c) 1999,2000 Markus Friedl. All rights reserved. |
39 | * | |
40 | * Redistribution and use in source and binary forms, with or without | |
41 | * modification, are permitted provided that the following conditions | |
42 | * are met: | |
43 | * 1. Redistributions of source code must retain the above copyright | |
44 | * notice, this list of conditions and the following disclaimer. | |
45 | * 2. Redistributions in binary form must reproduce the above copyright | |
46 | * notice, this list of conditions and the following disclaimer in the | |
47 | * documentation and/or other materials provided with the distribution. | |
48 | * | |
49 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
50 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
51 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
52 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
53 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
54 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
55 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
56 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
57 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
58 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
5260325f | 59 | */ |
8efc0c15 | 60 | |
61 | #include "includes.h" | |
df841692 | 62 | RCSID("$OpenBSD: clientloop.c,v 1.65 2001/04/20 07:17:51 djm Exp $"); |
8efc0c15 | 63 | |
8efc0c15 | 64 | #include "ssh.h" |
42f11eb2 | 65 | #include "ssh1.h" |
66 | #include "ssh2.h" | |
67 | #include "xmalloc.h" | |
8efc0c15 | 68 | #include "packet.h" |
69 | #include "buffer.h" | |
7368a6c8 | 70 | #include "compat.h" |
71 | #include "channels.h" | |
72 | #include "dispatch.h" | |
2e73a022 | 73 | #include "buffer.h" |
74 | #include "bufaux.h" | |
fa08c86b | 75 | #include "key.h" |
e092ce67 | 76 | #include "kex.h" |
42f11eb2 | 77 | #include "log.h" |
78 | #include "readconf.h" | |
b5c334cc | 79 | #include "clientloop.h" |
42f11eb2 | 80 | #include "authfd.h" |
81 | #include "atomicio.h" | |
30dcc918 | 82 | #include "sshtty.h" |
e968270c | 83 | #include "misc.h" |
a22aff1f | 84 | |
85 | /* import options */ | |
86 | extern Options options; | |
87 | ||
8efc0c15 | 88 | /* Flag indicating that stdin should be redirected from /dev/null. */ |
89 | extern int stdin_null_flag; | |
90 | ||
aa3378df | 91 | /* |
92 | * Name of the host we are connecting to. This is the name given on the | |
93 | * command line, or the HostName specified for the user-supplied name in a | |
94 | * configuration file. | |
95 | */ | |
8efc0c15 | 96 | extern char *host; |
97 | ||
aa3378df | 98 | /* |
99 | * Flag to indicate that we have received a window change signal which has | |
100 | * not yet been processed. This will cause a message indicating the new | |
101 | * window size to be sent to the server a little later. This is volatile | |
102 | * because this is updated in a signal handler. | |
103 | */ | |
8efc0c15 | 104 | static volatile int received_window_change_signal = 0; |
105 | ||
8efc0c15 | 106 | /* Flag indicating whether the user\'s terminal is in non-blocking mode. */ |
107 | static int in_non_blocking_mode = 0; | |
108 | ||
109 | /* Common data for the client loop code. */ | |
2e73a022 | 110 | static int quit_pending; /* Set to non-zero to quit the client loop. */ |
111 | static int escape_char; /* Escape character. */ | |
5260325f | 112 | static int escape_pending; /* Last character was the escape character */ |
113 | static int last_was_cr; /* Last character was a newline. */ | |
114 | static int exit_status; /* Used to store the exit status of the command. */ | |
115 | static int stdin_eof; /* EOF has been encountered on standard error. */ | |
116 | static Buffer stdin_buffer; /* Buffer for stdin data. */ | |
117 | static Buffer stdout_buffer; /* Buffer for stdout data. */ | |
118 | static Buffer stderr_buffer; /* Buffer for stderr data. */ | |
1e3b8b07 | 119 | static u_long stdin_bytes, stdout_bytes, stderr_bytes; |
120 | static u_int buffer_high;/* Soft max buffer size. */ | |
5260325f | 121 | static int connection_in; /* Connection to server (input). */ |
122 | static int connection_out; /* Connection to server (output). */ | |
c422989b | 123 | static int need_rekeying; /* Set to non-zero if rekeying is requested. */ |
eb0dd41f | 124 | static int session_closed = 0; /* In SSH2: login session closed. */ |
8efc0c15 | 125 | |
8ce64345 | 126 | void client_init_dispatch(void); |
127 | int session_ident = -1; | |
128 | ||
e092ce67 | 129 | /*XXX*/ |
130 | extern Kex *xxx_kex; | |
131 | ||
8efc0c15 | 132 | /* Restores stdin to blocking mode. */ |
133 | ||
6ae2364d | 134 | void |
5ca51e19 | 135 | leave_non_blocking(void) |
8efc0c15 | 136 | { |
5260325f | 137 | if (in_non_blocking_mode) { |
138 | (void) fcntl(fileno(stdin), F_SETFL, 0); | |
139 | in_non_blocking_mode = 0; | |
140 | fatal_remove_cleanup((void (*) (void *)) leave_non_blocking, NULL); | |
141 | } | |
8efc0c15 | 142 | } |
143 | ||
5260325f | 144 | /* Puts stdin terminal in non-blocking mode. */ |
145 | ||
6ae2364d | 146 | void |
5ca51e19 | 147 | enter_non_blocking(void) |
8efc0c15 | 148 | { |
5260325f | 149 | in_non_blocking_mode = 1; |
150 | (void) fcntl(fileno(stdin), F_SETFL, O_NONBLOCK); | |
151 | fatal_add_cleanup((void (*) (void *)) leave_non_blocking, NULL); | |
8efc0c15 | 152 | } |
153 | ||
aa3378df | 154 | /* |
155 | * Signal handler for the window change signal (SIGWINCH). This just sets a | |
156 | * flag indicating that the window has changed. | |
157 | */ | |
8efc0c15 | 158 | |
6ae2364d | 159 | void |
5260325f | 160 | window_change_handler(int sig) |
8efc0c15 | 161 | { |
5260325f | 162 | received_window_change_signal = 1; |
163 | signal(SIGWINCH, window_change_handler); | |
8efc0c15 | 164 | } |
165 | ||
aa3378df | 166 | /* |
167 | * Signal handler for signals that cause the program to terminate. These | |
168 | * signals must be trapped to restore terminal modes. | |
169 | */ | |
8efc0c15 | 170 | |
6ae2364d | 171 | void |
5260325f | 172 | signal_handler(int sig) |
8efc0c15 | 173 | { |
30dcc918 | 174 | if (in_raw_mode()) |
5260325f | 175 | leave_raw_mode(); |
176 | if (in_non_blocking_mode) | |
177 | leave_non_blocking(); | |
178 | channel_stop_listening(); | |
179 | packet_close(); | |
180 | fatal("Killed by signal %d.", sig); | |
8efc0c15 | 181 | } |
182 | ||
aa3378df | 183 | /* |
184 | * Returns current time in seconds from Jan 1, 1970 with the maximum | |
185 | * available resolution. | |
186 | */ | |
8efc0c15 | 187 | |
6ae2364d | 188 | double |
5ca51e19 | 189 | get_current_time(void) |
8efc0c15 | 190 | { |
5260325f | 191 | struct timeval tv; |
192 | gettimeofday(&tv, NULL); | |
193 | return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0; | |
8efc0c15 | 194 | } |
195 | ||
aa3378df | 196 | /* |
197 | * This is called when the interactive is entered. This checks if there is | |
198 | * an EOF coming on stdin. We must check this explicitly, as select() does | |
199 | * not appear to wake up when redirecting from /dev/null. | |
200 | */ | |
8efc0c15 | 201 | |
6ae2364d | 202 | void |
5ca51e19 | 203 | client_check_initial_eof_on_stdin(void) |
8efc0c15 | 204 | { |
5260325f | 205 | int len; |
206 | char buf[1]; | |
207 | ||
aa3378df | 208 | /* |
209 | * If standard input is to be "redirected from /dev/null", we simply | |
210 | * mark that we have seen an EOF and send an EOF message to the | |
211 | * server. Otherwise, we try to read a single character; it appears | |
212 | * that for some files, such /dev/null, select() never wakes up for | |
213 | * read for this descriptor, which means that we never get EOF. This | |
214 | * way we will get the EOF if stdin comes from /dev/null or similar. | |
215 | */ | |
5260325f | 216 | if (stdin_null_flag) { |
217 | /* Fake EOF on stdin. */ | |
218 | debug("Sending eof."); | |
219 | stdin_eof = 1; | |
220 | packet_start(SSH_CMSG_EOF); | |
221 | packet_send(); | |
222 | } else { | |
5260325f | 223 | enter_non_blocking(); |
224 | ||
225 | /* Check for immediate EOF on stdin. */ | |
226 | len = read(fileno(stdin), buf, 1); | |
227 | if (len == 0) { | |
aa3378df | 228 | /* EOF. Record that we have seen it and send EOF to server. */ |
5260325f | 229 | debug("Sending eof."); |
230 | stdin_eof = 1; | |
231 | packet_start(SSH_CMSG_EOF); | |
232 | packet_send(); | |
233 | } else if (len > 0) { | |
aa3378df | 234 | /* |
235 | * Got data. We must store the data in the buffer, | |
236 | * and also process it as an escape character if | |
237 | * appropriate. | |
238 | */ | |
1e3b8b07 | 239 | if ((u_char) buf[0] == escape_char) |
5260325f | 240 | escape_pending = 1; |
7e8911cd | 241 | else |
5260325f | 242 | buffer_append(&stdin_buffer, buf, 1); |
5260325f | 243 | } |
5260325f | 244 | leave_non_blocking(); |
8efc0c15 | 245 | } |
8efc0c15 | 246 | } |
247 | ||
8efc0c15 | 248 | |
aa3378df | 249 | /* |
250 | * Make packets from buffered stdin data, and buffer them for sending to the | |
251 | * connection. | |
252 | */ | |
8efc0c15 | 253 | |
6ae2364d | 254 | void |
5ca51e19 | 255 | client_make_packets_from_stdin_data(void) |
8efc0c15 | 256 | { |
1e3b8b07 | 257 | u_int len; |
5260325f | 258 | |
259 | /* Send buffered stdin data to the server. */ | |
260 | while (buffer_len(&stdin_buffer) > 0 && | |
261 | packet_not_very_much_data_to_write()) { | |
262 | len = buffer_len(&stdin_buffer); | |
263 | /* Keep the packets at reasonable size. */ | |
264 | if (len > packet_get_maxsize()) | |
265 | len = packet_get_maxsize(); | |
266 | packet_start(SSH_CMSG_STDIN_DATA); | |
267 | packet_put_string(buffer_ptr(&stdin_buffer), len); | |
268 | packet_send(); | |
269 | buffer_consume(&stdin_buffer, len); | |
7e8911cd | 270 | stdin_bytes += len; |
5260325f | 271 | /* If we have a pending EOF, send it now. */ |
272 | if (stdin_eof && buffer_len(&stdin_buffer) == 0) { | |
273 | packet_start(SSH_CMSG_EOF); | |
274 | packet_send(); | |
275 | } | |
8efc0c15 | 276 | } |
8efc0c15 | 277 | } |
278 | ||
aa3378df | 279 | /* |
280 | * Checks if the client window has changed, and sends a packet about it to | |
281 | * the server if so. The actual change is detected elsewhere (by a software | |
282 | * interrupt on Unix); this just checks the flag and sends a message if | |
283 | * appropriate. | |
284 | */ | |
8efc0c15 | 285 | |
6ae2364d | 286 | void |
5ca51e19 | 287 | client_check_window_change(void) |
8efc0c15 | 288 | { |
8ce64345 | 289 | struct winsize ws; |
290 | ||
291 | if (! received_window_change_signal) | |
292 | return; | |
293 | /** XXX race */ | |
294 | received_window_change_signal = 0; | |
295 | ||
296 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
297 | return; | |
298 | ||
de273eef | 299 | debug2("client_check_window_change: changed"); |
8ce64345 | 300 | |
301 | if (compat20) { | |
302 | channel_request_start(session_ident, "window-change", 0); | |
303 | packet_put_int(ws.ws_col); | |
304 | packet_put_int(ws.ws_row); | |
305 | packet_put_int(ws.ws_xpixel); | |
306 | packet_put_int(ws.ws_ypixel); | |
307 | packet_send(); | |
308 | } else { | |
309 | packet_start(SSH_CMSG_WINDOW_SIZE); | |
310 | packet_put_int(ws.ws_row); | |
311 | packet_put_int(ws.ws_col); | |
312 | packet_put_int(ws.ws_xpixel); | |
313 | packet_put_int(ws.ws_ypixel); | |
314 | packet_send(); | |
8efc0c15 | 315 | } |
8efc0c15 | 316 | } |
317 | ||
aa3378df | 318 | /* |
319 | * Waits until the client can do something (some data becomes available on | |
320 | * one of the file descriptors). | |
321 | */ | |
8efc0c15 | 322 | |
6ae2364d | 323 | void |
39929cdb | 324 | client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp, |
c422989b | 325 | int *maxfdp, int rekeying) |
8efc0c15 | 326 | { |
39929cdb | 327 | /* Add any selections by the channel mechanism. */ |
c422989b | 328 | channel_prepare_select(readsetp, writesetp, maxfdp, rekeying); |
5260325f | 329 | |
8ce64345 | 330 | if (!compat20) { |
331 | /* Read from the connection, unless our buffers are full. */ | |
332 | if (buffer_len(&stdout_buffer) < buffer_high && | |
333 | buffer_len(&stderr_buffer) < buffer_high && | |
334 | channel_not_very_much_buffered_data()) | |
39929cdb | 335 | FD_SET(connection_in, *readsetp); |
8ce64345 | 336 | /* |
337 | * Read from stdin, unless we have seen EOF or have very much | |
338 | * buffered data to send to the server. | |
339 | */ | |
340 | if (!stdin_eof && packet_not_very_much_data_to_write()) | |
39929cdb | 341 | FD_SET(fileno(stdin), *readsetp); |
8ce64345 | 342 | |
343 | /* Select stdout/stderr if have data in buffer. */ | |
344 | if (buffer_len(&stdout_buffer) > 0) | |
39929cdb | 345 | FD_SET(fileno(stdout), *writesetp); |
8ce64345 | 346 | if (buffer_len(&stderr_buffer) > 0) |
39929cdb | 347 | FD_SET(fileno(stderr), *writesetp); |
8ce64345 | 348 | } else { |
39929cdb | 349 | FD_SET(connection_in, *readsetp); |
8ce64345 | 350 | } |
5260325f | 351 | |
5260325f | 352 | /* Select server connection if have data to write to the server. */ |
353 | if (packet_have_data_to_write()) | |
39929cdb | 354 | FD_SET(connection_out, *writesetp); |
5260325f | 355 | |
aa3378df | 356 | /* |
357 | * Wait for something to happen. This will suspend the process until | |
358 | * some selected descriptor can be read, written, or has some other | |
359 | * event pending. Note: if you want to implement SSH_MSG_IGNORE | |
360 | * messages to fool traffic analysis, this might be the place to do | |
361 | * it: just have a random timeout for the select, and send a random | |
362 | * SSH_MSG_IGNORE packet when the timeout expires. | |
363 | */ | |
5260325f | 364 | |
39929cdb | 365 | if (select((*maxfdp)+1, *readsetp, *writesetp, NULL, NULL) < 0) { |
5260325f | 366 | char buf[100]; |
fd193ca4 | 367 | |
368 | /* | |
369 | * We have to clear the select masks, because we return. | |
370 | * We have to return, because the mainloop checks for the flags | |
371 | * set by the signal handlers. | |
372 | */ | |
373 | memset(*readsetp, 0, *maxfdp); | |
374 | memset(*writesetp, 0, *maxfdp); | |
375 | ||
5260325f | 376 | if (errno == EINTR) |
377 | return; | |
378 | /* Note: we might still have data in the buffers. */ | |
379 | snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno)); | |
380 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
5260325f | 381 | quit_pending = 1; |
382 | } | |
8efc0c15 | 383 | } |
384 | ||
6ae2364d | 385 | void |
2e73a022 | 386 | client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr) |
8efc0c15 | 387 | { |
5260325f | 388 | struct winsize oldws, newws; |
389 | ||
390 | /* Flush stdout and stderr buffers. */ | |
2e73a022 | 391 | if (buffer_len(bout) > 0) |
392 | atomicio(write, fileno(stdout), buffer_ptr(bout), buffer_len(bout)); | |
393 | if (buffer_len(berr) > 0) | |
394 | atomicio(write, fileno(stderr), buffer_ptr(berr), buffer_len(berr)); | |
5260325f | 395 | |
5260325f | 396 | leave_raw_mode(); |
397 | ||
aa3378df | 398 | /* |
399 | * Free (and clear) the buffer to reduce the amount of data that gets | |
400 | * written to swap. | |
401 | */ | |
2e73a022 | 402 | buffer_free(bin); |
403 | buffer_free(bout); | |
404 | buffer_free(berr); | |
5260325f | 405 | |
406 | /* Save old window size. */ | |
407 | ioctl(fileno(stdin), TIOCGWINSZ, &oldws); | |
408 | ||
409 | /* Send the suspend signal to the program itself. */ | |
410 | kill(getpid(), SIGTSTP); | |
411 | ||
412 | /* Check if the window size has changed. */ | |
413 | if (ioctl(fileno(stdin), TIOCGWINSZ, &newws) >= 0 && | |
414 | (oldws.ws_row != newws.ws_row || | |
415 | oldws.ws_col != newws.ws_col || | |
416 | oldws.ws_xpixel != newws.ws_xpixel || | |
417 | oldws.ws_ypixel != newws.ws_ypixel)) | |
418 | received_window_change_signal = 1; | |
419 | ||
420 | /* OK, we have been continued by the user. Reinitialize buffers. */ | |
2e73a022 | 421 | buffer_init(bin); |
422 | buffer_init(bout); | |
423 | buffer_init(berr); | |
5260325f | 424 | |
5260325f | 425 | enter_raw_mode(); |
8efc0c15 | 426 | } |
427 | ||
6ae2364d | 428 | void |
8ce64345 | 429 | client_process_net_input(fd_set * readset) |
8efc0c15 | 430 | { |
8ce64345 | 431 | int len; |
432 | char buf[8192]; | |
5260325f | 433 | |
aa3378df | 434 | /* |
435 | * Read input from the server, and add any such data to the buffer of | |
436 | * the packet subsystem. | |
437 | */ | |
5260325f | 438 | if (FD_ISSET(connection_in, readset)) { |
439 | /* Read as much as possible. */ | |
440 | len = read(connection_in, buf, sizeof(buf)); | |
441 | if (len == 0) { | |
442 | /* Received EOF. The remote host has closed the connection. */ | |
443 | snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n", | |
444 | host); | |
8efc0c15 | 445 | buffer_append(&stderr_buffer, buf, strlen(buf)); |
8efc0c15 | 446 | quit_pending = 1; |
447 | return; | |
5260325f | 448 | } |
aa3378df | 449 | /* |
450 | * There is a kernel bug on Solaris that causes select to | |
451 | * sometimes wake up even though there is no data available. | |
452 | */ | |
09cb311c | 453 | if (len < 0 && (errno == EAGAIN || errno == EINTR)) |
5260325f | 454 | len = 0; |
455 | ||
456 | if (len < 0) { | |
457 | /* An error has encountered. Perhaps there is a network problem. */ | |
458 | snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n", | |
459 | host, strerror(errno)); | |
460 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
5260325f | 461 | quit_pending = 1; |
462 | return; | |
463 | } | |
464 | packet_process_incoming(buf, len); | |
465 | } | |
8ce64345 | 466 | } |
467 | ||
2e73a022 | 468 | /* process the characters one by one */ |
469 | int | |
470 | process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len) | |
471 | { | |
472 | char string[1024]; | |
473 | pid_t pid; | |
474 | int bytes = 0; | |
1e3b8b07 | 475 | u_int i; |
476 | u_char ch; | |
2e73a022 | 477 | char *s; |
478 | ||
479 | for (i = 0; i < len; i++) { | |
480 | /* Get one character at a time. */ | |
481 | ch = buf[i]; | |
482 | ||
483 | if (escape_pending) { | |
484 | /* We have previously seen an escape character. */ | |
485 | /* Clear the flag now. */ | |
486 | escape_pending = 0; | |
487 | ||
488 | /* Process the escaped character. */ | |
489 | switch (ch) { | |
490 | case '.': | |
491 | /* Terminate the connection. */ | |
492 | snprintf(string, sizeof string, "%c.\r\n", escape_char); | |
493 | buffer_append(berr, string, strlen(string)); | |
2e73a022 | 494 | |
495 | quit_pending = 1; | |
496 | return -1; | |
497 | ||
498 | case 'Z' - 64: | |
499 | /* Suspend the program. */ | |
500 | /* Print a message to that effect to the user. */ | |
501 | snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char); | |
502 | buffer_append(berr, string, strlen(string)); | |
2e73a022 | 503 | |
504 | /* Restore terminal modes and suspend. */ | |
505 | client_suspend_self(bin, bout, berr); | |
506 | ||
507 | /* We have been continued. */ | |
508 | continue; | |
509 | ||
e092ce67 | 510 | case 'R': |
54506d2e | 511 | if (compat20) { |
512 | if (datafellows & SSH_BUG_NOREKEY) | |
513 | log("Server does not support re-keying"); | |
514 | else | |
515 | need_rekeying = 1; | |
516 | } | |
e092ce67 | 517 | continue; |
518 | ||
2e73a022 | 519 | case '&': |
520 | /* XXX does not work yet with proto 2 */ | |
521 | if (compat20) | |
522 | continue; | |
523 | /* | |
524 | * Detach the program (continue to serve connections, | |
525 | * but put in background and no more new connections). | |
526 | */ | |
527 | if (!stdin_eof) { | |
528 | /* | |
529 | * Sending SSH_CMSG_EOF alone does not always appear | |
530 | * to be enough. So we try to send an EOF character | |
531 | * first. | |
532 | */ | |
533 | packet_start(SSH_CMSG_STDIN_DATA); | |
534 | packet_put_string("\004", 1); | |
535 | packet_send(); | |
536 | /* Close stdin. */ | |
537 | stdin_eof = 1; | |
538 | if (buffer_len(bin) == 0) { | |
539 | packet_start(SSH_CMSG_EOF); | |
540 | packet_send(); | |
541 | } | |
542 | } | |
543 | /* Restore tty modes. */ | |
544 | leave_raw_mode(); | |
545 | ||
546 | /* Stop listening for new connections. */ | |
547 | channel_stop_listening(); | |
548 | ||
549 | printf("%c& [backgrounded]\n", escape_char); | |
550 | ||
551 | /* Fork into background. */ | |
552 | pid = fork(); | |
553 | if (pid < 0) { | |
554 | error("fork: %.100s", strerror(errno)); | |
555 | continue; | |
556 | } | |
557 | if (pid != 0) { /* This is the parent. */ | |
558 | /* The parent just exits. */ | |
559 | exit(0); | |
560 | } | |
561 | /* The child continues serving connections. */ | |
562 | continue; /*XXX ? */ | |
563 | ||
564 | case '?': | |
565 | snprintf(string, sizeof string, | |
566 | "%c?\r\n\ | |
567 | Supported escape sequences:\r\n\ | |
568 | ~. - terminate connection\r\n\ | |
df841692 | 569 | ~R - Request rekey (SSH protocol 2 only)\r\n\ |
2e73a022 | 570 | ~^Z - suspend ssh\r\n\ |
571 | ~# - list forwarded connections\r\n\ | |
572 | ~& - background ssh (when waiting for connections to terminate)\r\n\ | |
573 | ~? - this message\r\n\ | |
574 | ~~ - send the escape character by typing it twice\r\n\ | |
575 | (Note that escapes are only recognized immediately after newline.)\r\n", | |
576 | escape_char); | |
577 | buffer_append(berr, string, strlen(string)); | |
578 | continue; | |
579 | ||
580 | case '#': | |
581 | snprintf(string, sizeof string, "%c#\r\n", escape_char); | |
582 | buffer_append(berr, string, strlen(string)); | |
583 | s = channel_open_message(); | |
584 | buffer_append(berr, s, strlen(s)); | |
585 | xfree(s); | |
586 | continue; | |
587 | ||
588 | default: | |
589 | if (ch != escape_char) { | |
590 | buffer_put_char(bin, escape_char); | |
591 | bytes++; | |
592 | } | |
593 | /* Escaped characters fall through here */ | |
594 | break; | |
595 | } | |
596 | } else { | |
597 | /* | |
598 | * The previous character was not an escape char. Check if this | |
599 | * is an escape. | |
600 | */ | |
601 | if (last_was_cr && ch == escape_char) { | |
602 | /* It is. Set the flag and continue to next character. */ | |
603 | escape_pending = 1; | |
604 | continue; | |
605 | } | |
606 | } | |
607 | ||
608 | /* | |
609 | * Normal character. Record whether it was a newline, | |
610 | * and append it to the buffer. | |
611 | */ | |
612 | last_was_cr = (ch == '\r' || ch == '\n'); | |
613 | buffer_put_char(bin, ch); | |
614 | bytes++; | |
615 | } | |
616 | return bytes; | |
617 | } | |
618 | ||
6ae2364d | 619 | void |
8ce64345 | 620 | client_process_input(fd_set * readset) |
621 | { | |
9da5c3c9 | 622 | int len; |
2e73a022 | 623 | char buf[8192]; |
8ce64345 | 624 | |
5260325f | 625 | /* Read input from stdin. */ |
626 | if (FD_ISSET(fileno(stdin), readset)) { | |
627 | /* Read as much as possible. */ | |
628 | len = read(fileno(stdin), buf, sizeof(buf)); | |
cf6bc93c | 629 | if (len < 0 && (errno == EAGAIN || errno == EINTR)) |
630 | return; /* we'll try again later */ | |
5260325f | 631 | if (len <= 0) { |
aa3378df | 632 | /* |
633 | * Received EOF or error. They are treated | |
634 | * similarly, except that an error message is printed | |
635 | * if it was an error condition. | |
636 | */ | |
5260325f | 637 | if (len < 0) { |
638 | snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno)); | |
639 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
5260325f | 640 | } |
641 | /* Mark that we have seen EOF. */ | |
642 | stdin_eof = 1; | |
aa3378df | 643 | /* |
644 | * Send an EOF message to the server unless there is | |
645 | * data in the buffer. If there is data in the | |
646 | * buffer, no message will be sent now. Code | |
647 | * elsewhere will send the EOF when the buffer | |
648 | * becomes empty if stdin_eof is set. | |
649 | */ | |
5260325f | 650 | if (buffer_len(&stdin_buffer) == 0) { |
8efc0c15 | 651 | packet_start(SSH_CMSG_EOF); |
652 | packet_send(); | |
5260325f | 653 | } |
654 | } else if (escape_char == -1) { | |
aa3378df | 655 | /* |
656 | * Normal successful read, and no escape character. | |
657 | * Just append the data to buffer. | |
658 | */ | |
5260325f | 659 | buffer_append(&stdin_buffer, buf, len); |
5260325f | 660 | } else { |
aa3378df | 661 | /* |
662 | * Normal, successful read. But we have an escape character | |
663 | * and have to process the characters one by one. | |
664 | */ | |
7e8911cd | 665 | if (process_escapes(&stdin_buffer, &stdout_buffer, |
666 | &stderr_buffer, buf, len) == -1) | |
2e73a022 | 667 | return; |
5260325f | 668 | } |
669 | } | |
8efc0c15 | 670 | } |
671 | ||
6ae2364d | 672 | void |
5260325f | 673 | client_process_output(fd_set * writeset) |
8efc0c15 | 674 | { |
5260325f | 675 | int len; |
676 | char buf[100]; | |
677 | ||
678 | /* Write buffered output to stdout. */ | |
679 | if (FD_ISSET(fileno(stdout), writeset)) { | |
680 | /* Write as much data as possible. */ | |
681 | len = write(fileno(stdout), buffer_ptr(&stdout_buffer), | |
a408af76 | 682 | buffer_len(&stdout_buffer)); |
5260325f | 683 | if (len <= 0) { |
cf6bc93c | 684 | if (errno == EINTR || errno == EAGAIN) |
5260325f | 685 | len = 0; |
686 | else { | |
aa3378df | 687 | /* |
688 | * An error or EOF was encountered. Put an | |
689 | * error message to stderr buffer. | |
690 | */ | |
5260325f | 691 | snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno)); |
692 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
5260325f | 693 | quit_pending = 1; |
694 | return; | |
695 | } | |
696 | } | |
697 | /* Consume printed data from the buffer. */ | |
698 | buffer_consume(&stdout_buffer, len); | |
cd332296 | 699 | stdout_bytes += len; |
5260325f | 700 | } |
701 | /* Write buffered output to stderr. */ | |
702 | if (FD_ISSET(fileno(stderr), writeset)) { | |
703 | /* Write as much data as possible. */ | |
704 | len = write(fileno(stderr), buffer_ptr(&stderr_buffer), | |
a408af76 | 705 | buffer_len(&stderr_buffer)); |
5260325f | 706 | if (len <= 0) { |
cf6bc93c | 707 | if (errno == EINTR || errno == EAGAIN) |
5260325f | 708 | len = 0; |
709 | else { | |
aa3378df | 710 | /* EOF or error, but can't even print error message. */ |
5260325f | 711 | quit_pending = 1; |
712 | return; | |
713 | } | |
714 | } | |
715 | /* Consume printed characters from the buffer. */ | |
716 | buffer_consume(&stderr_buffer, len); | |
cd332296 | 717 | stderr_bytes += len; |
8efc0c15 | 718 | } |
8efc0c15 | 719 | } |
720 | ||
7368a6c8 | 721 | /* |
722 | * Get packets from the connection input buffer, and process them as long as | |
723 | * there are packets available. | |
724 | * | |
725 | * Any unknown packets received during the actual | |
726 | * session cause the session to terminate. This is | |
727 | * intended to make debugging easier since no | |
728 | * confirmations are sent. Any compatible protocol | |
729 | * extensions must be negotiated during the | |
730 | * preparatory phase. | |
731 | */ | |
732 | ||
6ae2364d | 733 | void |
5ca51e19 | 734 | client_process_buffered_input_packets(void) |
7368a6c8 | 735 | { |
e092ce67 | 736 | dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL); |
7368a6c8 | 737 | } |
738 | ||
2e73a022 | 739 | /* scan buf[] for '~' before sending data to the peer */ |
740 | ||
741 | int | |
742 | simple_escape_filter(Channel *c, char *buf, int len) | |
743 | { | |
744 | /* XXX we assume c->extended is writeable */ | |
745 | return process_escapes(&c->input, &c->output, &c->extended, buf, len); | |
746 | } | |
747 | ||
eb0dd41f | 748 | void |
749 | client_channel_closed(int id, void *arg) | |
750 | { | |
751 | if (id != session_ident) | |
752 | error("client_channel_closed: id %d != session_ident %d", | |
753 | id, session_ident); | |
754 | session_closed = 1; | |
30dcc918 | 755 | if (in_raw_mode()) |
d0a4c20b | 756 | leave_raw_mode(); |
eb0dd41f | 757 | } |
758 | ||
aa3378df | 759 | /* |
760 | * Implements the interactive session with the server. This is called after | |
761 | * the user has been authenticated, and a command has been started on the | |
762 | * remote host. If escape_char != -1, it is the character used as an escape | |
763 | * character for terminating or suspending the session. | |
764 | */ | |
8efc0c15 | 765 | |
6ae2364d | 766 | int |
2e73a022 | 767 | client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id) |
8efc0c15 | 768 | { |
39929cdb | 769 | fd_set *readset = NULL, *writeset = NULL; |
5260325f | 770 | double start_time, total_time; |
c422989b | 771 | int max_fd = 0, len, rekeying = 0; |
5260325f | 772 | char buf[100]; |
773 | ||
774 | debug("Entering interactive session."); | |
775 | ||
776 | start_time = get_current_time(); | |
777 | ||
778 | /* Initialize variables. */ | |
779 | escape_pending = 0; | |
780 | last_was_cr = 1; | |
781 | exit_status = -1; | |
782 | stdin_eof = 0; | |
783 | buffer_high = 64 * 1024; | |
784 | connection_in = packet_get_connection_in(); | |
785 | connection_out = packet_get_connection_out(); | |
39929cdb | 786 | max_fd = MAX(connection_in, connection_out); |
787 | ||
788 | if (!compat20) { | |
e968270c | 789 | /* enable nonblocking unless tty */ |
790 | if (!isatty(fileno(stdin))) | |
791 | set_nonblock(fileno(stdin)); | |
792 | if (!isatty(fileno(stdout))) | |
793 | set_nonblock(fileno(stdout)); | |
794 | if (!isatty(fileno(stderr))) | |
795 | set_nonblock(fileno(stderr)); | |
39929cdb | 796 | max_fd = MAX(max_fd, fileno(stdin)); |
797 | max_fd = MAX(max_fd, fileno(stdout)); | |
798 | max_fd = MAX(max_fd, fileno(stderr)); | |
799 | } | |
5260325f | 800 | stdin_bytes = 0; |
801 | stdout_bytes = 0; | |
802 | stderr_bytes = 0; | |
803 | quit_pending = 0; | |
804 | escape_char = escape_char_arg; | |
805 | ||
806 | /* Initialize buffers. */ | |
807 | buffer_init(&stdin_buffer); | |
808 | buffer_init(&stdout_buffer); | |
809 | buffer_init(&stderr_buffer); | |
810 | ||
7368a6c8 | 811 | client_init_dispatch(); |
812 | ||
5260325f | 813 | /* Set signal handlers to restore non-blocking mode. */ |
814 | signal(SIGINT, signal_handler); | |
815 | signal(SIGQUIT, signal_handler); | |
816 | signal(SIGTERM, signal_handler); | |
817 | signal(SIGPIPE, SIG_IGN); | |
818 | if (have_pty) | |
819 | signal(SIGWINCH, window_change_handler); | |
820 | ||
5260325f | 821 | if (have_pty) |
822 | enter_raw_mode(); | |
823 | ||
1fc8ccdf | 824 | if (compat20) { |
825 | session_ident = ssh2_chan_id; | |
826 | if (escape_char != -1) | |
827 | channel_register_filter(session_ident, | |
828 | simple_escape_filter); | |
eb0dd41f | 829 | if (session_ident != -1) |
830 | channel_register_cleanup(session_ident, | |
831 | client_channel_closed); | |
1fc8ccdf | 832 | } else { |
833 | /* Check if we should immediately send eof on stdin. */ | |
8ce64345 | 834 | client_check_initial_eof_on_stdin(); |
1fc8ccdf | 835 | } |
2e73a022 | 836 | |
5260325f | 837 | /* Main loop of the client for the interactive session mode. */ |
838 | while (!quit_pending) { | |
5260325f | 839 | |
aa3378df | 840 | /* Process buffered packets sent by the server. */ |
5260325f | 841 | client_process_buffered_input_packets(); |
842 | ||
eb0dd41f | 843 | if (compat20 && session_closed && !channel_still_open()) |
8ce64345 | 844 | break; |
eb0dd41f | 845 | |
846 | rekeying = (xxx_kex != NULL && !xxx_kex->done); | |
8ce64345 | 847 | |
c422989b | 848 | if (rekeying) { |
849 | debug("rekeying in progress"); | |
850 | } else { | |
851 | /* | |
852 | * Make packets of buffered stdin data, and buffer | |
853 | * them for sending to the server. | |
854 | */ | |
855 | if (!compat20) | |
856 | client_make_packets_from_stdin_data(); | |
5260325f | 857 | |
c422989b | 858 | /* |
859 | * Make packets from buffered channel data, and | |
860 | * enqueue them for sending to the server. | |
861 | */ | |
862 | if (packet_not_very_much_data_to_write()) | |
863 | channel_output_poll(); | |
5260325f | 864 | |
c422989b | 865 | /* |
866 | * Check if the window size has changed, and buffer a | |
867 | * message about it to the server if so. | |
868 | */ | |
869 | client_check_window_change(); | |
5260325f | 870 | |
c422989b | 871 | if (quit_pending) |
872 | break; | |
873 | } | |
aa3378df | 874 | /* |
875 | * Wait until we have something to do (something becomes | |
876 | * available on one of the descriptors). | |
877 | */ | |
c422989b | 878 | client_wait_until_can_do_something(&readset, &writeset, |
879 | &max_fd, rekeying); | |
5260325f | 880 | |
881 | if (quit_pending) | |
882 | break; | |
883 | ||
c422989b | 884 | /* Do channel operations unless rekeying in progress. */ |
885 | if (!rekeying) { | |
886 | channel_after_select(readset, writeset); | |
887 | ||
888 | if (need_rekeying) { | |
889 | debug("user requests rekeying"); | |
890 | xxx_kex->done = 0; | |
891 | kex_send_kexinit(xxx_kex); | |
892 | need_rekeying = 0; | |
893 | } | |
894 | } | |
5260325f | 895 | |
8ce64345 | 896 | /* Buffer input from the connection. */ |
39929cdb | 897 | client_process_net_input(readset); |
5260325f | 898 | |
8ce64345 | 899 | if (quit_pending) |
900 | break; | |
901 | ||
902 | if (!compat20) { | |
903 | /* Buffer data from stdin */ | |
39929cdb | 904 | client_process_input(readset); |
8ce64345 | 905 | /* |
906 | * Process output to stdout and stderr. Output to | |
907 | * the connection is processed elsewhere (above). | |
908 | */ | |
39929cdb | 909 | client_process_output(writeset); |
8ce64345 | 910 | } |
5260325f | 911 | |
aa3378df | 912 | /* Send as much buffered packet data as possible to the sender. */ |
39929cdb | 913 | if (FD_ISSET(connection_out, writeset)) |
5260325f | 914 | packet_write_poll(); |
915 | } | |
39929cdb | 916 | if (readset) |
917 | xfree(readset); | |
918 | if (writeset) | |
919 | xfree(writeset); | |
5260325f | 920 | |
921 | /* Terminate the session. */ | |
922 | ||
923 | /* Stop watching for window change. */ | |
924 | if (have_pty) | |
925 | signal(SIGWINCH, SIG_DFL); | |
926 | ||
927 | /* Stop listening for connections. */ | |
928 | channel_stop_listening(); | |
929 | ||
aa3378df | 930 | /* |
931 | * In interactive mode (with pseudo tty) display a message indicating | |
932 | * that the connection has been closed. | |
933 | */ | |
5260325f | 934 | if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) { |
935 | snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host); | |
936 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
8efc0c15 | 937 | } |
5260325f | 938 | /* Output any buffered data for stdout. */ |
939 | while (buffer_len(&stdout_buffer) > 0) { | |
940 | len = write(fileno(stdout), buffer_ptr(&stdout_buffer), | |
a408af76 | 941 | buffer_len(&stdout_buffer)); |
5260325f | 942 | if (len <= 0) { |
943 | error("Write failed flushing stdout buffer."); | |
944 | break; | |
945 | } | |
946 | buffer_consume(&stdout_buffer, len); | |
cd332296 | 947 | stdout_bytes += len; |
8efc0c15 | 948 | } |
5260325f | 949 | |
950 | /* Output any buffered data for stderr. */ | |
951 | while (buffer_len(&stderr_buffer) > 0) { | |
952 | len = write(fileno(stderr), buffer_ptr(&stderr_buffer), | |
a408af76 | 953 | buffer_len(&stderr_buffer)); |
5260325f | 954 | if (len <= 0) { |
955 | error("Write failed flushing stderr buffer."); | |
956 | break; | |
957 | } | |
958 | buffer_consume(&stderr_buffer, len); | |
cd332296 | 959 | stderr_bytes += len; |
5260325f | 960 | } |
961 | ||
5260325f | 962 | if (have_pty) |
963 | leave_raw_mode(); | |
964 | ||
965 | /* Clear and free any buffers. */ | |
966 | memset(buf, 0, sizeof(buf)); | |
967 | buffer_free(&stdin_buffer); | |
968 | buffer_free(&stdout_buffer); | |
969 | buffer_free(&stderr_buffer); | |
970 | ||
971 | /* Report bytes transferred, and transfer rates. */ | |
972 | total_time = get_current_time() - start_time; | |
973 | debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds", | |
974 | stdin_bytes, stdout_bytes, stderr_bytes, total_time); | |
975 | if (total_time > 0) | |
976 | debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f", | |
977 | stdin_bytes / total_time, stdout_bytes / total_time, | |
978 | stderr_bytes / total_time); | |
979 | ||
980 | /* Return the exit status of the program. */ | |
981 | debug("Exit status %d", exit_status); | |
982 | return exit_status; | |
8efc0c15 | 983 | } |
7368a6c8 | 984 | |
985 | /*********/ | |
986 | ||
987 | void | |
188adeb2 | 988 | client_input_stdout_data(int type, int plen, void *ctxt) |
7368a6c8 | 989 | { |
1e3b8b07 | 990 | u_int data_len; |
7368a6c8 | 991 | char *data = packet_get_string(&data_len); |
992 | packet_integrity_check(plen, 4 + data_len, type); | |
993 | buffer_append(&stdout_buffer, data, data_len); | |
7368a6c8 | 994 | memset(data, 0, data_len); |
995 | xfree(data); | |
996 | } | |
997 | void | |
188adeb2 | 998 | client_input_stderr_data(int type, int plen, void *ctxt) |
7368a6c8 | 999 | { |
1e3b8b07 | 1000 | u_int data_len; |
7368a6c8 | 1001 | char *data = packet_get_string(&data_len); |
1002 | packet_integrity_check(plen, 4 + data_len, type); | |
1003 | buffer_append(&stderr_buffer, data, data_len); | |
7368a6c8 | 1004 | memset(data, 0, data_len); |
1005 | xfree(data); | |
1006 | } | |
1007 | void | |
188adeb2 | 1008 | client_input_exit_status(int type, int plen, void *ctxt) |
7368a6c8 | 1009 | { |
1010 | packet_integrity_check(plen, 4, type); | |
1011 | exit_status = packet_get_int(); | |
1012 | /* Acknowledge the exit. */ | |
1013 | packet_start(SSH_CMSG_EXIT_CONFIRMATION); | |
1014 | packet_send(); | |
1015 | /* | |
1016 | * Must wait for packet to be sent since we are | |
1017 | * exiting the loop. | |
1018 | */ | |
1019 | packet_write_wait(); | |
1020 | /* Flag that we want to exit. */ | |
1021 | quit_pending = 1; | |
1022 | } | |
1023 | ||
fa08c86b | 1024 | Channel * |
1025 | client_request_forwarded_tcpip(const char *request_type, int rchan) | |
1026 | { | |
1027 | Channel* c = NULL; | |
1028 | char *listen_address, *originator_address; | |
1029 | int listen_port, originator_port; | |
1030 | int sock, newch; | |
1031 | ||
1032 | /* Get rest of the packet */ | |
1033 | listen_address = packet_get_string(NULL); | |
1034 | listen_port = packet_get_int(); | |
1035 | originator_address = packet_get_string(NULL); | |
1036 | originator_port = packet_get_int(); | |
1037 | packet_done(); | |
1038 | ||
1039 | debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d", | |
1040 | listen_address, listen_port, originator_address, originator_port); | |
1041 | ||
1042 | sock = channel_connect_by_listen_adress(listen_port); | |
1043 | if (sock >= 0) { | |
1044 | newch = channel_new("forwarded-tcpip", | |
97fb6912 | 1045 | SSH_CHANNEL_CONNECTING, sock, sock, -1, |
fa08c86b | 1046 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0, |
1047 | xstrdup(originator_address), 1); | |
1048 | c = channel_lookup(newch); | |
1049 | } | |
1050 | xfree(originator_address); | |
1051 | xfree(listen_address); | |
1052 | return c; | |
1053 | } | |
1054 | ||
1055 | Channel* | |
1056 | client_request_x11(const char *request_type, int rchan) | |
1057 | { | |
1058 | Channel *c = NULL; | |
1059 | char *originator; | |
1060 | int originator_port; | |
1061 | int sock, newch; | |
1062 | ||
1063 | if (!options.forward_x11) { | |
1064 | error("Warning: ssh server tried X11 forwarding."); | |
1065 | error("Warning: this is probably a break in attempt by a malicious server."); | |
1066 | return NULL; | |
1067 | } | |
1068 | originator = packet_get_string(NULL); | |
1069 | if (datafellows & SSH_BUG_X11FWD) { | |
1070 | debug2("buggy server: x11 request w/o originator_port"); | |
1071 | originator_port = 0; | |
1072 | } else { | |
1073 | originator_port = packet_get_int(); | |
1074 | } | |
1075 | packet_done(); | |
1076 | /* XXX check permission */ | |
865ac82e | 1077 | debug("client_request_x11: request from %s %d", originator, |
1078 | originator_port); | |
fa08c86b | 1079 | sock = x11_connect_display(); |
1080 | if (sock >= 0) { | |
1081 | newch = channel_new("x11", | |
1082 | SSH_CHANNEL_X11_OPEN, sock, sock, -1, | |
1083 | CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, | |
1084 | xstrdup("x11"), 1); | |
1085 | c = channel_lookup(newch); | |
1086 | } | |
1087 | xfree(originator); | |
1088 | return c; | |
1089 | } | |
1090 | ||
1091 | Channel* | |
1092 | client_request_agent(const char *request_type, int rchan) | |
1093 | { | |
1094 | Channel *c = NULL; | |
1095 | int sock, newch; | |
1096 | ||
1097 | if (!options.forward_agent) { | |
1098 | error("Warning: ssh server tried agent forwarding."); | |
1099 | error("Warning: this is probably a break in attempt by a malicious server."); | |
1100 | return NULL; | |
1101 | } | |
1102 | sock = ssh_get_authentication_socket(); | |
1103 | if (sock >= 0) { | |
1104 | newch = channel_new("authentication agent connection", | |
1105 | SSH_CHANNEL_OPEN, sock, sock, -1, | |
1106 | CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0, | |
1107 | xstrdup("authentication agent connection"), 1); | |
1108 | c = channel_lookup(newch); | |
1109 | } | |
1110 | return c; | |
1111 | } | |
1112 | ||
0b242b12 | 1113 | /* XXXX move to generic input handler */ |
1114 | void | |
188adeb2 | 1115 | client_input_channel_open(int type, int plen, void *ctxt) |
0b242b12 | 1116 | { |
1117 | Channel *c = NULL; | |
1118 | char *ctype; | |
1e3b8b07 | 1119 | u_int len; |
0b242b12 | 1120 | int rchan; |
1121 | int rmaxpack; | |
1122 | int rwindow; | |
1123 | ||
1124 | ctype = packet_get_string(&len); | |
1125 | rchan = packet_get_int(); | |
1126 | rwindow = packet_get_int(); | |
1127 | rmaxpack = packet_get_int(); | |
1128 | ||
1d1ffb87 | 1129 | debug("client_input_channel_open: ctype %s rchan %d win %d max %d", |
0b242b12 | 1130 | ctype, rchan, rwindow, rmaxpack); |
1131 | ||
fa08c86b | 1132 | if (strcmp(ctype, "forwarded-tcpip") == 0) { |
1133 | c = client_request_forwarded_tcpip(ctype, rchan); | |
1134 | } else if (strcmp(ctype, "x11") == 0) { | |
1135 | c = client_request_x11(ctype, rchan); | |
1136 | } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) { | |
1137 | c = client_request_agent(ctype, rchan); | |
0b242b12 | 1138 | } |
1139 | /* XXX duplicate : */ | |
1140 | if (c != NULL) { | |
1141 | debug("confirm %s", ctype); | |
1142 | c->remote_id = rchan; | |
1143 | c->remote_window = rwindow; | |
1144 | c->remote_maxpacket = rmaxpack; | |
1145 | ||
1146 | packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1147 | packet_put_int(c->remote_id); | |
1148 | packet_put_int(c->self); | |
1149 | packet_put_int(c->local_window); | |
1150 | packet_put_int(c->local_maxpacket); | |
1151 | packet_send(); | |
1152 | } else { | |
1153 | debug("failure %s", ctype); | |
1154 | packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); | |
1155 | packet_put_int(rchan); | |
1156 | packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED); | |
1157 | packet_put_cstring("bla bla"); | |
1158 | packet_put_cstring(""); | |
1159 | packet_send(); | |
1160 | } | |
1161 | xfree(ctype); | |
1162 | } | |
1fc8ccdf | 1163 | void |
1164 | client_input_channel_req(int type, int plen, void *ctxt) | |
1165 | { | |
1166 | Channel *c = NULL; | |
1167 | int id, reply, success = 0; | |
1168 | char *rtype; | |
1169 | ||
1170 | id = packet_get_int(); | |
1171 | rtype = packet_get_string(NULL); | |
1172 | reply = packet_get_char(); | |
1173 | ||
1174 | debug("client_input_channel_req: channel %d rtype %s reply %d", | |
1175 | id, rtype, reply); | |
1176 | ||
1177 | if (session_ident == -1) { | |
1178 | error("client_input_channel_req: no channel %d", session_ident); | |
1179 | } else if (id != session_ident) { | |
1180 | error("client_input_channel_req: channel %d: wrong channel: %d", | |
1181 | session_ident, id); | |
1182 | } | |
1183 | c = channel_lookup(id); | |
1184 | if (c == NULL) { | |
1185 | error("client_input_channel_req: channel %d: unknown channel", id); | |
1186 | } else if (strcmp(rtype, "exit-status") == 0) { | |
1187 | success = 1; | |
1188 | exit_status = packet_get_int(); | |
1189 | packet_done(); | |
1190 | } | |
1191 | if (reply) { | |
1192 | packet_start(success ? | |
1193 | SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE); | |
1194 | packet_put_int(c->remote_id); | |
1195 | packet_send(); | |
1196 | } | |
1197 | xfree(rtype); | |
1198 | } | |
0b242b12 | 1199 | |
6ae2364d | 1200 | void |
5ca51e19 | 1201 | client_init_dispatch_20(void) |
8ce64345 | 1202 | { |
7a37c112 | 1203 | dispatch_init(&dispatch_protocol_error); |
8ce64345 | 1204 | dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose); |
1205 | dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data); | |
1206 | dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof); | |
1207 | dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data); | |
0b242b12 | 1208 | dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open); |
8ce64345 | 1209 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); |
1210 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); | |
1fc8ccdf | 1211 | dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req); |
8ce64345 | 1212 | dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust); |
7a37c112 | 1213 | |
1214 | /* rekeying */ | |
1215 | dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit); | |
8ce64345 | 1216 | } |
6ae2364d | 1217 | void |
5ca51e19 | 1218 | client_init_dispatch_13(void) |
7368a6c8 | 1219 | { |
1220 | dispatch_init(NULL); | |
1221 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close); | |
1222 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation); | |
1223 | dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data); | |
7368a6c8 | 1224 | dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); |
1225 | dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); | |
1226 | dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open); | |
7368a6c8 | 1227 | dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status); |
1228 | dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data); | |
1229 | dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data); | |
a22aff1f | 1230 | |
1231 | dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ? | |
1232 | &auth_input_open_request : &deny_input_open); | |
1233 | dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ? | |
1234 | &x11_input_open : &deny_input_open); | |
7368a6c8 | 1235 | } |
6ae2364d | 1236 | void |
5ca51e19 | 1237 | client_init_dispatch_15(void) |
7368a6c8 | 1238 | { |
1239 | client_init_dispatch_13(); | |
1240 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof); | |
1241 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose); | |
1242 | } | |
6ae2364d | 1243 | void |
5ca51e19 | 1244 | client_init_dispatch(void) |
7368a6c8 | 1245 | { |
8ce64345 | 1246 | if (compat20) |
1247 | client_init_dispatch_20(); | |
1248 | else if (compat13) | |
7368a6c8 | 1249 | client_init_dispatch_13(); |
1250 | else | |
1251 | client_init_dispatch_15(); | |
1252 | } |