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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" | |
97fb6912 | 62 | RCSID("$OpenBSD: clientloop.c,v 1.41 2000/12/05 20:34:10 markus Exp $"); |
8efc0c15 | 63 | |
64 | #include "xmalloc.h" | |
65 | #include "ssh.h" | |
66 | #include "packet.h" | |
67 | #include "buffer.h" | |
6a17f9c2 | 68 | #include "readconf.h" |
8efc0c15 | 69 | |
8ce64345 | 70 | #include "ssh2.h" |
7368a6c8 | 71 | #include "compat.h" |
72 | #include "channels.h" | |
73 | #include "dispatch.h" | |
74 | ||
2e73a022 | 75 | #include "buffer.h" |
76 | #include "bufaux.h" | |
77 | ||
fa08c86b | 78 | #include <openssl/dsa.h> |
79 | #include <openssl/rsa.h> | |
80 | #include "key.h" | |
81 | #include "authfd.h" | |
a22aff1f | 82 | |
83 | /* import options */ | |
84 | extern Options options; | |
85 | ||
8efc0c15 | 86 | /* Flag indicating that stdin should be redirected from /dev/null. */ |
87 | extern int stdin_null_flag; | |
88 | ||
aa3378df | 89 | /* |
90 | * Name of the host we are connecting to. This is the name given on the | |
91 | * command line, or the HostName specified for the user-supplied name in a | |
92 | * configuration file. | |
93 | */ | |
8efc0c15 | 94 | extern char *host; |
95 | ||
aa3378df | 96 | /* |
97 | * Flag to indicate that we have received a window change signal which has | |
98 | * not yet been processed. This will cause a message indicating the new | |
99 | * window size to be sent to the server a little later. This is volatile | |
100 | * because this is updated in a signal handler. | |
101 | */ | |
8efc0c15 | 102 | static volatile int received_window_change_signal = 0; |
103 | ||
104 | /* Terminal modes, as saved by enter_raw_mode. */ | |
105 | static struct termios saved_tio; | |
106 | ||
aa3378df | 107 | /* |
108 | * Flag indicating whether we are in raw mode. This is used by | |
109 | * enter_raw_mode and leave_raw_mode. | |
110 | */ | |
8efc0c15 | 111 | static int in_raw_mode = 0; |
112 | ||
113 | /* Flag indicating whether the user\'s terminal is in non-blocking mode. */ | |
114 | static int in_non_blocking_mode = 0; | |
115 | ||
116 | /* Common data for the client loop code. */ | |
2e73a022 | 117 | static int quit_pending; /* Set to non-zero to quit the client loop. */ |
118 | static int escape_char; /* Escape character. */ | |
5260325f | 119 | static int escape_pending; /* Last character was the escape character */ |
120 | static int last_was_cr; /* Last character was a newline. */ | |
121 | static int exit_status; /* Used to store the exit status of the command. */ | |
122 | static int stdin_eof; /* EOF has been encountered on standard error. */ | |
123 | static Buffer stdin_buffer; /* Buffer for stdin data. */ | |
124 | static Buffer stdout_buffer; /* Buffer for stdout data. */ | |
125 | static Buffer stderr_buffer; /* Buffer for stderr data. */ | |
2e73a022 | 126 | static unsigned long stdin_bytes, stdout_bytes, stderr_bytes; |
5260325f | 127 | static unsigned int buffer_high;/* Soft max buffer size. */ |
128 | static int max_fd; /* Maximum file descriptor number in select(). */ | |
129 | static int connection_in; /* Connection to server (input). */ | |
130 | static int connection_out; /* Connection to server (output). */ | |
8efc0c15 | 131 | |
8ce64345 | 132 | |
133 | void client_init_dispatch(void); | |
134 | int session_ident = -1; | |
135 | ||
aa3378df | 136 | /* Returns the user\'s terminal to normal mode if it had been put in raw mode. */ |
8efc0c15 | 137 | |
6ae2364d | 138 | void |
5260325f | 139 | leave_raw_mode() |
8efc0c15 | 140 | { |
5260325f | 141 | if (!in_raw_mode) |
142 | return; | |
143 | in_raw_mode = 0; | |
144 | if (tcsetattr(fileno(stdin), TCSADRAIN, &saved_tio) < 0) | |
145 | perror("tcsetattr"); | |
8efc0c15 | 146 | |
5260325f | 147 | fatal_remove_cleanup((void (*) (void *)) leave_raw_mode, NULL); |
8efc0c15 | 148 | } |
149 | ||
150 | /* Puts the user\'s terminal in raw mode. */ | |
151 | ||
6ae2364d | 152 | void |
5260325f | 153 | enter_raw_mode() |
8efc0c15 | 154 | { |
5260325f | 155 | struct termios tio; |
156 | ||
157 | if (tcgetattr(fileno(stdin), &tio) < 0) | |
158 | perror("tcgetattr"); | |
159 | saved_tio = tio; | |
160 | tio.c_iflag |= IGNPAR; | |
161 | tio.c_iflag &= ~(ISTRIP | INLCR | IGNCR | ICRNL | IXON | IXANY | IXOFF); | |
162 | tio.c_lflag &= ~(ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHONL); | |
8efc0c15 | 163 | #ifdef IEXTEN |
5260325f | 164 | tio.c_lflag &= ~IEXTEN; |
165 | #endif /* IEXTEN */ | |
166 | tio.c_oflag &= ~OPOST; | |
167 | tio.c_cc[VMIN] = 1; | |
168 | tio.c_cc[VTIME] = 0; | |
169 | if (tcsetattr(fileno(stdin), TCSADRAIN, &tio) < 0) | |
170 | perror("tcsetattr"); | |
171 | in_raw_mode = 1; | |
172 | ||
173 | fatal_add_cleanup((void (*) (void *)) leave_raw_mode, NULL); | |
174 | } | |
8efc0c15 | 175 | |
176 | /* Restores stdin to blocking mode. */ | |
177 | ||
6ae2364d | 178 | void |
5260325f | 179 | leave_non_blocking() |
8efc0c15 | 180 | { |
5260325f | 181 | if (in_non_blocking_mode) { |
182 | (void) fcntl(fileno(stdin), F_SETFL, 0); | |
183 | in_non_blocking_mode = 0; | |
184 | fatal_remove_cleanup((void (*) (void *)) leave_non_blocking, NULL); | |
185 | } | |
8efc0c15 | 186 | } |
187 | ||
5260325f | 188 | /* Puts stdin terminal in non-blocking mode. */ |
189 | ||
6ae2364d | 190 | void |
5260325f | 191 | enter_non_blocking() |
8efc0c15 | 192 | { |
5260325f | 193 | in_non_blocking_mode = 1; |
194 | (void) fcntl(fileno(stdin), F_SETFL, O_NONBLOCK); | |
195 | fatal_add_cleanup((void (*) (void *)) leave_non_blocking, NULL); | |
8efc0c15 | 196 | } |
197 | ||
aa3378df | 198 | /* |
199 | * Signal handler for the window change signal (SIGWINCH). This just sets a | |
200 | * flag indicating that the window has changed. | |
201 | */ | |
8efc0c15 | 202 | |
6ae2364d | 203 | void |
5260325f | 204 | window_change_handler(int sig) |
8efc0c15 | 205 | { |
5260325f | 206 | received_window_change_signal = 1; |
207 | signal(SIGWINCH, window_change_handler); | |
8efc0c15 | 208 | } |
209 | ||
aa3378df | 210 | /* |
211 | * Signal handler for signals that cause the program to terminate. These | |
212 | * signals must be trapped to restore terminal modes. | |
213 | */ | |
8efc0c15 | 214 | |
6ae2364d | 215 | void |
5260325f | 216 | signal_handler(int sig) |
8efc0c15 | 217 | { |
5260325f | 218 | if (in_raw_mode) |
219 | leave_raw_mode(); | |
220 | if (in_non_blocking_mode) | |
221 | leave_non_blocking(); | |
222 | channel_stop_listening(); | |
223 | packet_close(); | |
224 | fatal("Killed by signal %d.", sig); | |
8efc0c15 | 225 | } |
226 | ||
aa3378df | 227 | /* |
228 | * Returns current time in seconds from Jan 1, 1970 with the maximum | |
229 | * available resolution. | |
230 | */ | |
8efc0c15 | 231 | |
6ae2364d | 232 | double |
5260325f | 233 | get_current_time() |
8efc0c15 | 234 | { |
5260325f | 235 | struct timeval tv; |
236 | gettimeofday(&tv, NULL); | |
237 | return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0; | |
8efc0c15 | 238 | } |
239 | ||
aa3378df | 240 | /* |
241 | * This is called when the interactive is entered. This checks if there is | |
242 | * an EOF coming on stdin. We must check this explicitly, as select() does | |
243 | * not appear to wake up when redirecting from /dev/null. | |
244 | */ | |
8efc0c15 | 245 | |
6ae2364d | 246 | void |
5260325f | 247 | client_check_initial_eof_on_stdin() |
8efc0c15 | 248 | { |
5260325f | 249 | int len; |
250 | char buf[1]; | |
251 | ||
aa3378df | 252 | /* |
253 | * If standard input is to be "redirected from /dev/null", we simply | |
254 | * mark that we have seen an EOF and send an EOF message to the | |
255 | * server. Otherwise, we try to read a single character; it appears | |
256 | * that for some files, such /dev/null, select() never wakes up for | |
257 | * read for this descriptor, which means that we never get EOF. This | |
258 | * way we will get the EOF if stdin comes from /dev/null or similar. | |
259 | */ | |
5260325f | 260 | if (stdin_null_flag) { |
261 | /* Fake EOF on stdin. */ | |
262 | debug("Sending eof."); | |
263 | stdin_eof = 1; | |
264 | packet_start(SSH_CMSG_EOF); | |
265 | packet_send(); | |
266 | } else { | |
5260325f | 267 | enter_non_blocking(); |
268 | ||
269 | /* Check for immediate EOF on stdin. */ | |
270 | len = read(fileno(stdin), buf, 1); | |
271 | if (len == 0) { | |
aa3378df | 272 | /* EOF. Record that we have seen it and send EOF to server. */ |
5260325f | 273 | debug("Sending eof."); |
274 | stdin_eof = 1; | |
275 | packet_start(SSH_CMSG_EOF); | |
276 | packet_send(); | |
277 | } else if (len > 0) { | |
aa3378df | 278 | /* |
279 | * Got data. We must store the data in the buffer, | |
280 | * and also process it as an escape character if | |
281 | * appropriate. | |
282 | */ | |
5260325f | 283 | if ((unsigned char) buf[0] == escape_char) |
284 | escape_pending = 1; | |
285 | else { | |
286 | buffer_append(&stdin_buffer, buf, 1); | |
287 | stdin_bytes += 1; | |
288 | } | |
289 | } | |
5260325f | 290 | leave_non_blocking(); |
8efc0c15 | 291 | } |
8efc0c15 | 292 | } |
293 | ||
8efc0c15 | 294 | |
aa3378df | 295 | /* |
296 | * Make packets from buffered stdin data, and buffer them for sending to the | |
297 | * connection. | |
298 | */ | |
8efc0c15 | 299 | |
6ae2364d | 300 | void |
5260325f | 301 | client_make_packets_from_stdin_data() |
8efc0c15 | 302 | { |
5260325f | 303 | unsigned int len; |
304 | ||
305 | /* Send buffered stdin data to the server. */ | |
306 | while (buffer_len(&stdin_buffer) > 0 && | |
307 | packet_not_very_much_data_to_write()) { | |
308 | len = buffer_len(&stdin_buffer); | |
309 | /* Keep the packets at reasonable size. */ | |
310 | if (len > packet_get_maxsize()) | |
311 | len = packet_get_maxsize(); | |
312 | packet_start(SSH_CMSG_STDIN_DATA); | |
313 | packet_put_string(buffer_ptr(&stdin_buffer), len); | |
314 | packet_send(); | |
315 | buffer_consume(&stdin_buffer, len); | |
316 | /* If we have a pending EOF, send it now. */ | |
317 | if (stdin_eof && buffer_len(&stdin_buffer) == 0) { | |
318 | packet_start(SSH_CMSG_EOF); | |
319 | packet_send(); | |
320 | } | |
8efc0c15 | 321 | } |
8efc0c15 | 322 | } |
323 | ||
aa3378df | 324 | /* |
325 | * Checks if the client window has changed, and sends a packet about it to | |
326 | * the server if so. The actual change is detected elsewhere (by a software | |
327 | * interrupt on Unix); this just checks the flag and sends a message if | |
328 | * appropriate. | |
329 | */ | |
8efc0c15 | 330 | |
6ae2364d | 331 | void |
5260325f | 332 | client_check_window_change() |
8efc0c15 | 333 | { |
8ce64345 | 334 | struct winsize ws; |
335 | ||
336 | if (! received_window_change_signal) | |
337 | return; | |
338 | /** XXX race */ | |
339 | received_window_change_signal = 0; | |
340 | ||
341 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
342 | return; | |
343 | ||
de273eef | 344 | debug2("client_check_window_change: changed"); |
8ce64345 | 345 | |
346 | if (compat20) { | |
347 | channel_request_start(session_ident, "window-change", 0); | |
348 | packet_put_int(ws.ws_col); | |
349 | packet_put_int(ws.ws_row); | |
350 | packet_put_int(ws.ws_xpixel); | |
351 | packet_put_int(ws.ws_ypixel); | |
352 | packet_send(); | |
353 | } else { | |
354 | packet_start(SSH_CMSG_WINDOW_SIZE); | |
355 | packet_put_int(ws.ws_row); | |
356 | packet_put_int(ws.ws_col); | |
357 | packet_put_int(ws.ws_xpixel); | |
358 | packet_put_int(ws.ws_ypixel); | |
359 | packet_send(); | |
8efc0c15 | 360 | } |
8efc0c15 | 361 | } |
362 | ||
aa3378df | 363 | /* |
364 | * Waits until the client can do something (some data becomes available on | |
365 | * one of the file descriptors). | |
366 | */ | |
8efc0c15 | 367 | |
6ae2364d | 368 | void |
5260325f | 369 | client_wait_until_can_do_something(fd_set * readset, fd_set * writeset) |
8efc0c15 | 370 | { |
5260325f | 371 | /* Initialize select masks. */ |
372 | FD_ZERO(readset); | |
8ce64345 | 373 | FD_ZERO(writeset); |
5260325f | 374 | |
8ce64345 | 375 | if (!compat20) { |
376 | /* Read from the connection, unless our buffers are full. */ | |
377 | if (buffer_len(&stdout_buffer) < buffer_high && | |
378 | buffer_len(&stderr_buffer) < buffer_high && | |
379 | channel_not_very_much_buffered_data()) | |
380 | FD_SET(connection_in, readset); | |
381 | /* | |
382 | * Read from stdin, unless we have seen EOF or have very much | |
383 | * buffered data to send to the server. | |
384 | */ | |
385 | if (!stdin_eof && packet_not_very_much_data_to_write()) | |
386 | FD_SET(fileno(stdin), readset); | |
387 | ||
388 | /* Select stdout/stderr if have data in buffer. */ | |
389 | if (buffer_len(&stdout_buffer) > 0) | |
390 | FD_SET(fileno(stdout), writeset); | |
391 | if (buffer_len(&stderr_buffer) > 0) | |
392 | FD_SET(fileno(stderr), writeset); | |
393 | } else { | |
5260325f | 394 | FD_SET(connection_in, readset); |
8ce64345 | 395 | } |
5260325f | 396 | |
397 | /* Add any selections by the channel mechanism. */ | |
398 | channel_prepare_select(readset, writeset); | |
399 | ||
400 | /* Select server connection if have data to write to the server. */ | |
401 | if (packet_have_data_to_write()) | |
402 | FD_SET(connection_out, writeset); | |
403 | ||
8ce64345 | 404 | /* move UP XXX */ |
5260325f | 405 | /* Update maximum file descriptor number, if appropriate. */ |
406 | if (channel_max_fd() > max_fd) | |
407 | max_fd = channel_max_fd(); | |
408 | ||
aa3378df | 409 | /* |
410 | * Wait for something to happen. This will suspend the process until | |
411 | * some selected descriptor can be read, written, or has some other | |
412 | * event pending. Note: if you want to implement SSH_MSG_IGNORE | |
413 | * messages to fool traffic analysis, this might be the place to do | |
414 | * it: just have a random timeout for the select, and send a random | |
415 | * SSH_MSG_IGNORE packet when the timeout expires. | |
416 | */ | |
5260325f | 417 | |
418 | if (select(max_fd + 1, readset, writeset, NULL, NULL) < 0) { | |
419 | char buf[100]; | |
420 | /* Some systems fail to clear these automatically. */ | |
421 | FD_ZERO(readset); | |
422 | FD_ZERO(writeset); | |
423 | if (errno == EINTR) | |
424 | return; | |
425 | /* Note: we might still have data in the buffers. */ | |
426 | snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno)); | |
427 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
428 | stderr_bytes += strlen(buf); | |
429 | quit_pending = 1; | |
430 | } | |
8efc0c15 | 431 | } |
432 | ||
6ae2364d | 433 | void |
2e73a022 | 434 | client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr) |
8efc0c15 | 435 | { |
5260325f | 436 | struct winsize oldws, newws; |
437 | ||
438 | /* Flush stdout and stderr buffers. */ | |
2e73a022 | 439 | if (buffer_len(bout) > 0) |
440 | atomicio(write, fileno(stdout), buffer_ptr(bout), buffer_len(bout)); | |
441 | if (buffer_len(berr) > 0) | |
442 | atomicio(write, fileno(stderr), buffer_ptr(berr), buffer_len(berr)); | |
5260325f | 443 | |
5260325f | 444 | leave_raw_mode(); |
445 | ||
aa3378df | 446 | /* |
447 | * Free (and clear) the buffer to reduce the amount of data that gets | |
448 | * written to swap. | |
449 | */ | |
2e73a022 | 450 | buffer_free(bin); |
451 | buffer_free(bout); | |
452 | buffer_free(berr); | |
5260325f | 453 | |
454 | /* Save old window size. */ | |
455 | ioctl(fileno(stdin), TIOCGWINSZ, &oldws); | |
456 | ||
457 | /* Send the suspend signal to the program itself. */ | |
458 | kill(getpid(), SIGTSTP); | |
459 | ||
460 | /* Check if the window size has changed. */ | |
461 | if (ioctl(fileno(stdin), TIOCGWINSZ, &newws) >= 0 && | |
462 | (oldws.ws_row != newws.ws_row || | |
463 | oldws.ws_col != newws.ws_col || | |
464 | oldws.ws_xpixel != newws.ws_xpixel || | |
465 | oldws.ws_ypixel != newws.ws_ypixel)) | |
466 | received_window_change_signal = 1; | |
467 | ||
468 | /* OK, we have been continued by the user. Reinitialize buffers. */ | |
2e73a022 | 469 | buffer_init(bin); |
470 | buffer_init(bout); | |
471 | buffer_init(berr); | |
5260325f | 472 | |
5260325f | 473 | enter_raw_mode(); |
8efc0c15 | 474 | } |
475 | ||
6ae2364d | 476 | void |
8ce64345 | 477 | client_process_net_input(fd_set * readset) |
8efc0c15 | 478 | { |
8ce64345 | 479 | int len; |
480 | char buf[8192]; | |
5260325f | 481 | |
aa3378df | 482 | /* |
483 | * Read input from the server, and add any such data to the buffer of | |
484 | * the packet subsystem. | |
485 | */ | |
5260325f | 486 | if (FD_ISSET(connection_in, readset)) { |
487 | /* Read as much as possible. */ | |
488 | len = read(connection_in, buf, sizeof(buf)); | |
489 | if (len == 0) { | |
490 | /* Received EOF. The remote host has closed the connection. */ | |
491 | snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n", | |
492 | host); | |
8efc0c15 | 493 | buffer_append(&stderr_buffer, buf, strlen(buf)); |
494 | stderr_bytes += strlen(buf); | |
495 | quit_pending = 1; | |
496 | return; | |
5260325f | 497 | } |
aa3378df | 498 | /* |
499 | * There is a kernel bug on Solaris that causes select to | |
500 | * sometimes wake up even though there is no data available. | |
501 | */ | |
5260325f | 502 | if (len < 0 && errno == EAGAIN) |
503 | len = 0; | |
504 | ||
505 | if (len < 0) { | |
506 | /* An error has encountered. Perhaps there is a network problem. */ | |
507 | snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n", | |
508 | host, strerror(errno)); | |
509 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
510 | stderr_bytes += strlen(buf); | |
511 | quit_pending = 1; | |
512 | return; | |
513 | } | |
514 | packet_process_incoming(buf, len); | |
515 | } | |
8ce64345 | 516 | } |
517 | ||
2e73a022 | 518 | /* process the characters one by one */ |
519 | int | |
520 | process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len) | |
521 | { | |
522 | char string[1024]; | |
523 | pid_t pid; | |
524 | int bytes = 0; | |
525 | unsigned int i; | |
526 | unsigned char ch; | |
527 | char *s; | |
528 | ||
529 | for (i = 0; i < len; i++) { | |
530 | /* Get one character at a time. */ | |
531 | ch = buf[i]; | |
532 | ||
533 | if (escape_pending) { | |
534 | /* We have previously seen an escape character. */ | |
535 | /* Clear the flag now. */ | |
536 | escape_pending = 0; | |
537 | ||
538 | /* Process the escaped character. */ | |
539 | switch (ch) { | |
540 | case '.': | |
541 | /* Terminate the connection. */ | |
542 | snprintf(string, sizeof string, "%c.\r\n", escape_char); | |
543 | buffer_append(berr, string, strlen(string)); | |
544 | /*stderr_bytes += strlen(string); XXX*/ | |
545 | ||
546 | quit_pending = 1; | |
547 | return -1; | |
548 | ||
549 | case 'Z' - 64: | |
550 | /* Suspend the program. */ | |
551 | /* Print a message to that effect to the user. */ | |
552 | snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char); | |
553 | buffer_append(berr, string, strlen(string)); | |
554 | /*stderr_bytes += strlen(string); XXX*/ | |
555 | ||
556 | /* Restore terminal modes and suspend. */ | |
557 | client_suspend_self(bin, bout, berr); | |
558 | ||
559 | /* We have been continued. */ | |
560 | continue; | |
561 | ||
562 | case '&': | |
563 | /* XXX does not work yet with proto 2 */ | |
564 | if (compat20) | |
565 | continue; | |
566 | /* | |
567 | * Detach the program (continue to serve connections, | |
568 | * but put in background and no more new connections). | |
569 | */ | |
570 | if (!stdin_eof) { | |
571 | /* | |
572 | * Sending SSH_CMSG_EOF alone does not always appear | |
573 | * to be enough. So we try to send an EOF character | |
574 | * first. | |
575 | */ | |
576 | packet_start(SSH_CMSG_STDIN_DATA); | |
577 | packet_put_string("\004", 1); | |
578 | packet_send(); | |
579 | /* Close stdin. */ | |
580 | stdin_eof = 1; | |
581 | if (buffer_len(bin) == 0) { | |
582 | packet_start(SSH_CMSG_EOF); | |
583 | packet_send(); | |
584 | } | |
585 | } | |
586 | /* Restore tty modes. */ | |
587 | leave_raw_mode(); | |
588 | ||
589 | /* Stop listening for new connections. */ | |
590 | channel_stop_listening(); | |
591 | ||
592 | printf("%c& [backgrounded]\n", escape_char); | |
593 | ||
594 | /* Fork into background. */ | |
595 | pid = fork(); | |
596 | if (pid < 0) { | |
597 | error("fork: %.100s", strerror(errno)); | |
598 | continue; | |
599 | } | |
600 | if (pid != 0) { /* This is the parent. */ | |
601 | /* The parent just exits. */ | |
602 | exit(0); | |
603 | } | |
604 | /* The child continues serving connections. */ | |
605 | continue; /*XXX ? */ | |
606 | ||
607 | case '?': | |
608 | snprintf(string, sizeof string, | |
609 | "%c?\r\n\ | |
610 | Supported escape sequences:\r\n\ | |
611 | ~. - terminate connection\r\n\ | |
612 | ~^Z - suspend ssh\r\n\ | |
613 | ~# - list forwarded connections\r\n\ | |
614 | ~& - background ssh (when waiting for connections to terminate)\r\n\ | |
615 | ~? - this message\r\n\ | |
616 | ~~ - send the escape character by typing it twice\r\n\ | |
617 | (Note that escapes are only recognized immediately after newline.)\r\n", | |
618 | escape_char); | |
619 | buffer_append(berr, string, strlen(string)); | |
620 | continue; | |
621 | ||
622 | case '#': | |
623 | snprintf(string, sizeof string, "%c#\r\n", escape_char); | |
624 | buffer_append(berr, string, strlen(string)); | |
625 | s = channel_open_message(); | |
626 | buffer_append(berr, s, strlen(s)); | |
627 | xfree(s); | |
628 | continue; | |
629 | ||
630 | default: | |
631 | if (ch != escape_char) { | |
632 | buffer_put_char(bin, escape_char); | |
633 | bytes++; | |
634 | } | |
635 | /* Escaped characters fall through here */ | |
636 | break; | |
637 | } | |
638 | } else { | |
639 | /* | |
640 | * The previous character was not an escape char. Check if this | |
641 | * is an escape. | |
642 | */ | |
643 | if (last_was_cr && ch == escape_char) { | |
644 | /* It is. Set the flag and continue to next character. */ | |
645 | escape_pending = 1; | |
646 | continue; | |
647 | } | |
648 | } | |
649 | ||
650 | /* | |
651 | * Normal character. Record whether it was a newline, | |
652 | * and append it to the buffer. | |
653 | */ | |
654 | last_was_cr = (ch == '\r' || ch == '\n'); | |
655 | buffer_put_char(bin, ch); | |
656 | bytes++; | |
657 | } | |
658 | return bytes; | |
659 | } | |
660 | ||
6ae2364d | 661 | void |
8ce64345 | 662 | client_process_input(fd_set * readset) |
663 | { | |
2e73a022 | 664 | int ret; |
9da5c3c9 | 665 | int len; |
2e73a022 | 666 | char buf[8192]; |
8ce64345 | 667 | |
5260325f | 668 | /* Read input from stdin. */ |
669 | if (FD_ISSET(fileno(stdin), readset)) { | |
670 | /* Read as much as possible. */ | |
671 | len = read(fileno(stdin), buf, sizeof(buf)); | |
672 | if (len <= 0) { | |
aa3378df | 673 | /* |
674 | * Received EOF or error. They are treated | |
675 | * similarly, except that an error message is printed | |
676 | * if it was an error condition. | |
677 | */ | |
5260325f | 678 | if (len < 0) { |
679 | snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno)); | |
680 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
681 | stderr_bytes += strlen(buf); | |
682 | } | |
683 | /* Mark that we have seen EOF. */ | |
684 | stdin_eof = 1; | |
aa3378df | 685 | /* |
686 | * Send an EOF message to the server unless there is | |
687 | * data in the buffer. If there is data in the | |
688 | * buffer, no message will be sent now. Code | |
689 | * elsewhere will send the EOF when the buffer | |
690 | * becomes empty if stdin_eof is set. | |
691 | */ | |
5260325f | 692 | if (buffer_len(&stdin_buffer) == 0) { |
8efc0c15 | 693 | packet_start(SSH_CMSG_EOF); |
694 | packet_send(); | |
5260325f | 695 | } |
696 | } else if (escape_char == -1) { | |
aa3378df | 697 | /* |
698 | * Normal successful read, and no escape character. | |
699 | * Just append the data to buffer. | |
700 | */ | |
5260325f | 701 | buffer_append(&stdin_buffer, buf, len); |
702 | stdin_bytes += len; | |
703 | } else { | |
aa3378df | 704 | /* |
705 | * Normal, successful read. But we have an escape character | |
706 | * and have to process the characters one by one. | |
707 | */ | |
2e73a022 | 708 | ret = process_escapes(&stdin_buffer, &stdout_buffer, &stderr_buffer, buf, len); |
709 | if (ret == -1) | |
710 | return; | |
711 | stdout_bytes += ret; | |
5260325f | 712 | } |
713 | } | |
8efc0c15 | 714 | } |
715 | ||
6ae2364d | 716 | void |
5260325f | 717 | client_process_output(fd_set * writeset) |
8efc0c15 | 718 | { |
5260325f | 719 | int len; |
720 | char buf[100]; | |
721 | ||
722 | /* Write buffered output to stdout. */ | |
723 | if (FD_ISSET(fileno(stdout), writeset)) { | |
724 | /* Write as much data as possible. */ | |
725 | len = write(fileno(stdout), buffer_ptr(&stdout_buffer), | |
a408af76 | 726 | buffer_len(&stdout_buffer)); |
5260325f | 727 | if (len <= 0) { |
728 | if (errno == EAGAIN) | |
729 | len = 0; | |
730 | else { | |
aa3378df | 731 | /* |
732 | * An error or EOF was encountered. Put an | |
733 | * error message to stderr buffer. | |
734 | */ | |
5260325f | 735 | snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno)); |
736 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
737 | stderr_bytes += strlen(buf); | |
738 | quit_pending = 1; | |
739 | return; | |
740 | } | |
741 | } | |
742 | /* Consume printed data from the buffer. */ | |
743 | buffer_consume(&stdout_buffer, len); | |
744 | } | |
745 | /* Write buffered output to stderr. */ | |
746 | if (FD_ISSET(fileno(stderr), writeset)) { | |
747 | /* Write as much data as possible. */ | |
748 | len = write(fileno(stderr), buffer_ptr(&stderr_buffer), | |
a408af76 | 749 | buffer_len(&stderr_buffer)); |
5260325f | 750 | if (len <= 0) { |
751 | if (errno == EAGAIN) | |
752 | len = 0; | |
753 | else { | |
aa3378df | 754 | /* EOF or error, but can't even print error message. */ |
5260325f | 755 | quit_pending = 1; |
756 | return; | |
757 | } | |
758 | } | |
759 | /* Consume printed characters from the buffer. */ | |
760 | buffer_consume(&stderr_buffer, len); | |
8efc0c15 | 761 | } |
8efc0c15 | 762 | } |
763 | ||
7368a6c8 | 764 | /* |
765 | * Get packets from the connection input buffer, and process them as long as | |
766 | * there are packets available. | |
767 | * | |
768 | * Any unknown packets received during the actual | |
769 | * session cause the session to terminate. This is | |
770 | * intended to make debugging easier since no | |
771 | * confirmations are sent. Any compatible protocol | |
772 | * extensions must be negotiated during the | |
773 | * preparatory phase. | |
774 | */ | |
775 | ||
6ae2364d | 776 | void |
7368a6c8 | 777 | client_process_buffered_input_packets() |
778 | { | |
188adeb2 | 779 | dispatch_run(DISPATCH_NONBLOCK, &quit_pending, NULL); |
7368a6c8 | 780 | } |
781 | ||
2e73a022 | 782 | /* scan buf[] for '~' before sending data to the peer */ |
783 | ||
784 | int | |
785 | simple_escape_filter(Channel *c, char *buf, int len) | |
786 | { | |
787 | /* XXX we assume c->extended is writeable */ | |
788 | return process_escapes(&c->input, &c->output, &c->extended, buf, len); | |
789 | } | |
790 | ||
aa3378df | 791 | /* |
792 | * Implements the interactive session with the server. This is called after | |
793 | * the user has been authenticated, and a command has been started on the | |
794 | * remote host. If escape_char != -1, it is the character used as an escape | |
795 | * character for terminating or suspending the session. | |
796 | */ | |
8efc0c15 | 797 | |
6ae2364d | 798 | int |
2e73a022 | 799 | client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id) |
8efc0c15 | 800 | { |
5260325f | 801 | double start_time, total_time; |
802 | int len; | |
803 | char buf[100]; | |
804 | ||
805 | debug("Entering interactive session."); | |
806 | ||
807 | start_time = get_current_time(); | |
808 | ||
809 | /* Initialize variables. */ | |
810 | escape_pending = 0; | |
811 | last_was_cr = 1; | |
812 | exit_status = -1; | |
813 | stdin_eof = 0; | |
814 | buffer_high = 64 * 1024; | |
815 | connection_in = packet_get_connection_in(); | |
816 | connection_out = packet_get_connection_out(); | |
817 | max_fd = connection_in; | |
818 | if (connection_out > max_fd) | |
819 | max_fd = connection_out; | |
820 | stdin_bytes = 0; | |
821 | stdout_bytes = 0; | |
822 | stderr_bytes = 0; | |
823 | quit_pending = 0; | |
824 | escape_char = escape_char_arg; | |
825 | ||
826 | /* Initialize buffers. */ | |
827 | buffer_init(&stdin_buffer); | |
828 | buffer_init(&stdout_buffer); | |
829 | buffer_init(&stderr_buffer); | |
830 | ||
7368a6c8 | 831 | client_init_dispatch(); |
832 | ||
5260325f | 833 | /* Set signal handlers to restore non-blocking mode. */ |
834 | signal(SIGINT, signal_handler); | |
835 | signal(SIGQUIT, signal_handler); | |
836 | signal(SIGTERM, signal_handler); | |
837 | signal(SIGPIPE, SIG_IGN); | |
838 | if (have_pty) | |
839 | signal(SIGWINCH, window_change_handler); | |
840 | ||
5260325f | 841 | if (have_pty) |
842 | enter_raw_mode(); | |
843 | ||
704b1659 | 844 | /* Check if we should immediately send eof on stdin. */ |
8ce64345 | 845 | if (!compat20) |
846 | client_check_initial_eof_on_stdin(); | |
5260325f | 847 | |
2e73a022 | 848 | if (compat20 && escape_char != -1) |
849 | channel_register_filter(ssh2_chan_id, simple_escape_filter); | |
850 | ||
5260325f | 851 | /* Main loop of the client for the interactive session mode. */ |
852 | while (!quit_pending) { | |
853 | fd_set readset, writeset; | |
854 | ||
aa3378df | 855 | /* Process buffered packets sent by the server. */ |
5260325f | 856 | client_process_buffered_input_packets(); |
857 | ||
8ce64345 | 858 | if (compat20 && !channel_still_open()) { |
de273eef | 859 | debug2("!channel_still_open."); |
8ce64345 | 860 | break; |
861 | } | |
862 | ||
aa3378df | 863 | /* |
864 | * Make packets of buffered stdin data, and buffer them for | |
865 | * sending to the server. | |
866 | */ | |
8ce64345 | 867 | if (!compat20) |
868 | client_make_packets_from_stdin_data(); | |
5260325f | 869 | |
aa3378df | 870 | /* |
871 | * Make packets from buffered channel data, and buffer them | |
872 | * for sending to the server. | |
873 | */ | |
5260325f | 874 | if (packet_not_very_much_data_to_write()) |
875 | channel_output_poll(); | |
876 | ||
aa3378df | 877 | /* |
878 | * Check if the window size has changed, and buffer a message | |
879 | * about it to the server if so. | |
880 | */ | |
5260325f | 881 | client_check_window_change(); |
882 | ||
883 | if (quit_pending) | |
884 | break; | |
885 | ||
aa3378df | 886 | /* |
887 | * Wait until we have something to do (something becomes | |
888 | * available on one of the descriptors). | |
889 | */ | |
5260325f | 890 | client_wait_until_can_do_something(&readset, &writeset); |
891 | ||
892 | if (quit_pending) | |
893 | break; | |
894 | ||
895 | /* Do channel operations. */ | |
896 | channel_after_select(&readset, &writeset); | |
897 | ||
8ce64345 | 898 | /* Buffer input from the connection. */ |
899 | client_process_net_input(&readset); | |
5260325f | 900 | |
8ce64345 | 901 | if (quit_pending) |
902 | break; | |
903 | ||
904 | if (!compat20) { | |
905 | /* Buffer data from stdin */ | |
906 | client_process_input(&readset); | |
907 | /* | |
908 | * Process output to stdout and stderr. Output to | |
909 | * the connection is processed elsewhere (above). | |
910 | */ | |
911 | client_process_output(&writeset); | |
912 | } | |
5260325f | 913 | |
aa3378df | 914 | /* Send as much buffered packet data as possible to the sender. */ |
5260325f | 915 | if (FD_ISSET(connection_out, &writeset)) |
916 | packet_write_poll(); | |
917 | } | |
918 | ||
919 | /* Terminate the session. */ | |
920 | ||
921 | /* Stop watching for window change. */ | |
922 | if (have_pty) | |
923 | signal(SIGWINCH, SIG_DFL); | |
924 | ||
925 | /* Stop listening for connections. */ | |
926 | channel_stop_listening(); | |
927 | ||
aa3378df | 928 | /* |
929 | * In interactive mode (with pseudo tty) display a message indicating | |
930 | * that the connection has been closed. | |
931 | */ | |
5260325f | 932 | if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) { |
933 | snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host); | |
934 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
935 | stderr_bytes += strlen(buf); | |
8efc0c15 | 936 | } |
5260325f | 937 | /* Output any buffered data for stdout. */ |
938 | while (buffer_len(&stdout_buffer) > 0) { | |
939 | len = write(fileno(stdout), buffer_ptr(&stdout_buffer), | |
a408af76 | 940 | buffer_len(&stdout_buffer)); |
5260325f | 941 | if (len <= 0) { |
942 | error("Write failed flushing stdout buffer."); | |
943 | break; | |
944 | } | |
945 | buffer_consume(&stdout_buffer, len); | |
8efc0c15 | 946 | } |
5260325f | 947 | |
948 | /* Output any buffered data for stderr. */ | |
949 | while (buffer_len(&stderr_buffer) > 0) { | |
950 | len = write(fileno(stderr), buffer_ptr(&stderr_buffer), | |
a408af76 | 951 | buffer_len(&stderr_buffer)); |
5260325f | 952 | if (len <= 0) { |
953 | error("Write failed flushing stderr buffer."); | |
954 | break; | |
955 | } | |
956 | buffer_consume(&stderr_buffer, len); | |
957 | } | |
958 | ||
5260325f | 959 | if (have_pty) |
960 | leave_raw_mode(); | |
961 | ||
962 | /* Clear and free any buffers. */ | |
963 | memset(buf, 0, sizeof(buf)); | |
964 | buffer_free(&stdin_buffer); | |
965 | buffer_free(&stdout_buffer); | |
966 | buffer_free(&stderr_buffer); | |
967 | ||
968 | /* Report bytes transferred, and transfer rates. */ | |
969 | total_time = get_current_time() - start_time; | |
970 | debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds", | |
971 | stdin_bytes, stdout_bytes, stderr_bytes, total_time); | |
972 | if (total_time > 0) | |
973 | debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f", | |
974 | stdin_bytes / total_time, stdout_bytes / total_time, | |
975 | stderr_bytes / total_time); | |
976 | ||
977 | /* Return the exit status of the program. */ | |
978 | debug("Exit status %d", exit_status); | |
979 | return exit_status; | |
8efc0c15 | 980 | } |
7368a6c8 | 981 | |
982 | /*********/ | |
983 | ||
984 | void | |
188adeb2 | 985 | client_input_stdout_data(int type, int plen, void *ctxt) |
7368a6c8 | 986 | { |
987 | unsigned int data_len; | |
988 | char *data = packet_get_string(&data_len); | |
989 | packet_integrity_check(plen, 4 + data_len, type); | |
990 | buffer_append(&stdout_buffer, data, data_len); | |
991 | stdout_bytes += data_len; | |
992 | memset(data, 0, data_len); | |
993 | xfree(data); | |
994 | } | |
995 | void | |
188adeb2 | 996 | client_input_stderr_data(int type, int plen, void *ctxt) |
7368a6c8 | 997 | { |
998 | unsigned int data_len; | |
999 | char *data = packet_get_string(&data_len); | |
1000 | packet_integrity_check(plen, 4 + data_len, type); | |
1001 | buffer_append(&stderr_buffer, data, data_len); | |
1002 | stdout_bytes += data_len; | |
1003 | memset(data, 0, data_len); | |
1004 | xfree(data); | |
1005 | } | |
1006 | void | |
188adeb2 | 1007 | client_input_exit_status(int type, int plen, void *ctxt) |
7368a6c8 | 1008 | { |
1009 | packet_integrity_check(plen, 4, type); | |
1010 | exit_status = packet_get_int(); | |
1011 | /* Acknowledge the exit. */ | |
1012 | packet_start(SSH_CMSG_EXIT_CONFIRMATION); | |
1013 | packet_send(); | |
1014 | /* | |
1015 | * Must wait for packet to be sent since we are | |
1016 | * exiting the loop. | |
1017 | */ | |
1018 | packet_write_wait(); | |
1019 | /* Flag that we want to exit. */ | |
1020 | quit_pending = 1; | |
1021 | } | |
1022 | ||
fa08c86b | 1023 | Channel * |
1024 | client_request_forwarded_tcpip(const char *request_type, int rchan) | |
1025 | { | |
1026 | Channel* c = NULL; | |
1027 | char *listen_address, *originator_address; | |
1028 | int listen_port, originator_port; | |
1029 | int sock, newch; | |
1030 | ||
1031 | /* Get rest of the packet */ | |
1032 | listen_address = packet_get_string(NULL); | |
1033 | listen_port = packet_get_int(); | |
1034 | originator_address = packet_get_string(NULL); | |
1035 | originator_port = packet_get_int(); | |
1036 | packet_done(); | |
1037 | ||
1038 | debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d", | |
1039 | listen_address, listen_port, originator_address, originator_port); | |
1040 | ||
1041 | sock = channel_connect_by_listen_adress(listen_port); | |
1042 | if (sock >= 0) { | |
1043 | newch = channel_new("forwarded-tcpip", | |
97fb6912 | 1044 | SSH_CHANNEL_CONNECTING, sock, sock, -1, |
fa08c86b | 1045 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0, |
1046 | xstrdup(originator_address), 1); | |
1047 | c = channel_lookup(newch); | |
1048 | } | |
1049 | xfree(originator_address); | |
1050 | xfree(listen_address); | |
1051 | return c; | |
1052 | } | |
1053 | ||
1054 | Channel* | |
1055 | client_request_x11(const char *request_type, int rchan) | |
1056 | { | |
1057 | Channel *c = NULL; | |
1058 | char *originator; | |
1059 | int originator_port; | |
1060 | int sock, newch; | |
1061 | ||
1062 | if (!options.forward_x11) { | |
1063 | error("Warning: ssh server tried X11 forwarding."); | |
1064 | error("Warning: this is probably a break in attempt by a malicious server."); | |
1065 | return NULL; | |
1066 | } | |
1067 | originator = packet_get_string(NULL); | |
1068 | if (datafellows & SSH_BUG_X11FWD) { | |
1069 | debug2("buggy server: x11 request w/o originator_port"); | |
1070 | originator_port = 0; | |
1071 | } else { | |
1072 | originator_port = packet_get_int(); | |
1073 | } | |
1074 | packet_done(); | |
1075 | /* XXX check permission */ | |
1076 | sock = x11_connect_display(); | |
1077 | if (sock >= 0) { | |
1078 | newch = channel_new("x11", | |
1079 | SSH_CHANNEL_X11_OPEN, sock, sock, -1, | |
1080 | CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, | |
1081 | xstrdup("x11"), 1); | |
1082 | c = channel_lookup(newch); | |
1083 | } | |
1084 | xfree(originator); | |
1085 | return c; | |
1086 | } | |
1087 | ||
1088 | Channel* | |
1089 | client_request_agent(const char *request_type, int rchan) | |
1090 | { | |
1091 | Channel *c = NULL; | |
1092 | int sock, newch; | |
1093 | ||
1094 | if (!options.forward_agent) { | |
1095 | error("Warning: ssh server tried agent forwarding."); | |
1096 | error("Warning: this is probably a break in attempt by a malicious server."); | |
1097 | return NULL; | |
1098 | } | |
1099 | sock = ssh_get_authentication_socket(); | |
1100 | if (sock >= 0) { | |
1101 | newch = channel_new("authentication agent connection", | |
1102 | SSH_CHANNEL_OPEN, sock, sock, -1, | |
1103 | CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0, | |
1104 | xstrdup("authentication agent connection"), 1); | |
1105 | c = channel_lookup(newch); | |
1106 | } | |
1107 | return c; | |
1108 | } | |
1109 | ||
0b242b12 | 1110 | /* XXXX move to generic input handler */ |
1111 | void | |
188adeb2 | 1112 | client_input_channel_open(int type, int plen, void *ctxt) |
0b242b12 | 1113 | { |
1114 | Channel *c = NULL; | |
1115 | char *ctype; | |
0b242b12 | 1116 | unsigned int len; |
1117 | int rchan; | |
1118 | int rmaxpack; | |
1119 | int rwindow; | |
1120 | ||
1121 | ctype = packet_get_string(&len); | |
1122 | rchan = packet_get_int(); | |
1123 | rwindow = packet_get_int(); | |
1124 | rmaxpack = packet_get_int(); | |
1125 | ||
1d1ffb87 | 1126 | debug("client_input_channel_open: ctype %s rchan %d win %d max %d", |
0b242b12 | 1127 | ctype, rchan, rwindow, rmaxpack); |
1128 | ||
fa08c86b | 1129 | if (strcmp(ctype, "forwarded-tcpip") == 0) { |
1130 | c = client_request_forwarded_tcpip(ctype, rchan); | |
1131 | } else if (strcmp(ctype, "x11") == 0) { | |
1132 | c = client_request_x11(ctype, rchan); | |
1133 | } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) { | |
1134 | c = client_request_agent(ctype, rchan); | |
0b242b12 | 1135 | } |
1136 | /* XXX duplicate : */ | |
1137 | if (c != NULL) { | |
1138 | debug("confirm %s", ctype); | |
1139 | c->remote_id = rchan; | |
1140 | c->remote_window = rwindow; | |
1141 | c->remote_maxpacket = rmaxpack; | |
1142 | ||
1143 | packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1144 | packet_put_int(c->remote_id); | |
1145 | packet_put_int(c->self); | |
1146 | packet_put_int(c->local_window); | |
1147 | packet_put_int(c->local_maxpacket); | |
1148 | packet_send(); | |
1149 | } else { | |
1150 | debug("failure %s", ctype); | |
1151 | packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); | |
1152 | packet_put_int(rchan); | |
1153 | packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED); | |
1154 | packet_put_cstring("bla bla"); | |
1155 | packet_put_cstring(""); | |
1156 | packet_send(); | |
1157 | } | |
1158 | xfree(ctype); | |
1159 | } | |
1160 | ||
6ae2364d | 1161 | void |
8ce64345 | 1162 | client_init_dispatch_20() |
1163 | { | |
1164 | dispatch_init(&dispatch_protocol_error); | |
1165 | dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose); | |
1166 | dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data); | |
1167 | dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof); | |
1168 | dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data); | |
0b242b12 | 1169 | dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open); |
8ce64345 | 1170 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); |
1171 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); | |
1172 | dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &channel_input_channel_request); | |
1173 | dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust); | |
1174 | } | |
6ae2364d | 1175 | void |
7368a6c8 | 1176 | client_init_dispatch_13() |
1177 | { | |
1178 | dispatch_init(NULL); | |
1179 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close); | |
1180 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation); | |
1181 | dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data); | |
7368a6c8 | 1182 | dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); |
1183 | dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); | |
1184 | dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open); | |
7368a6c8 | 1185 | dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status); |
1186 | dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data); | |
1187 | dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data); | |
a22aff1f | 1188 | |
1189 | dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ? | |
1190 | &auth_input_open_request : &deny_input_open); | |
1191 | dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ? | |
1192 | &x11_input_open : &deny_input_open); | |
7368a6c8 | 1193 | } |
6ae2364d | 1194 | void |
7368a6c8 | 1195 | client_init_dispatch_15() |
1196 | { | |
1197 | client_init_dispatch_13(); | |
1198 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof); | |
1199 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose); | |
1200 | } | |
6ae2364d | 1201 | void |
7368a6c8 | 1202 | client_init_dispatch() |
1203 | { | |
8ce64345 | 1204 | if (compat20) |
1205 | client_init_dispatch_20(); | |
1206 | else if (compat13) | |
7368a6c8 | 1207 | client_init_dispatch_13(); |
1208 | else | |
1209 | client_init_dispatch_15(); | |
1210 | } | |
8ce64345 | 1211 | |
1212 | void | |
1213 | client_input_channel_req(int id, void *arg) | |
1214 | { | |
1215 | Channel *c = NULL; | |
1216 | unsigned int len; | |
1217 | int success = 0; | |
1218 | int reply; | |
1219 | char *rtype; | |
1220 | ||
1221 | rtype = packet_get_string(&len); | |
1222 | reply = packet_get_char(); | |
1223 | ||
1d1ffb87 | 1224 | debug("client_input_channel_req: rtype %s reply %d", rtype, reply); |
8ce64345 | 1225 | |
1226 | c = channel_lookup(id); | |
1227 | if (c == NULL) | |
bcbf86ec | 1228 | fatal("client_input_channel_req: channel %d: bad channel", id); |
8ce64345 | 1229 | |
1230 | if (session_ident == -1) { | |
1231 | error("client_input_channel_req: no channel %d", id); | |
1232 | } else if (id != session_ident) { | |
1233 | error("client_input_channel_req: bad channel %d != %d", | |
1234 | id, session_ident); | |
1235 | } else if (strcmp(rtype, "exit-status") == 0) { | |
1236 | success = 1; | |
1237 | exit_status = packet_get_int(); | |
6ae2364d | 1238 | packet_done(); |
8ce64345 | 1239 | } |
1240 | if (reply) { | |
1241 | packet_start(success ? | |
1242 | SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE); | |
1243 | packet_put_int(c->remote_id); | |
1244 | packet_send(); | |
1245 | } | |
1246 | xfree(rtype); | |
1247 | } | |
1248 | ||
1249 | void | |
1250 | client_set_session_ident(int id) | |
1251 | { | |
de273eef | 1252 | debug2("client_set_session_ident: id %d", id); |
8ce64345 | 1253 | session_ident = id; |
1254 | channel_register_callback(id, SSH2_MSG_CHANNEL_REQUEST, | |
1255 | client_input_channel_req, (void *)0); | |
1256 | } |