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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. |
a96070d4 | 38 | * Copyright (c) 1999, 2000, 2001 Markus Friedl. All rights reserved. |
bcbf86ec | 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" | |
5e96b616 | 62 | RCSID("$OpenBSD: clientloop.c,v 1.123 2004/06/13 15:03:02 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" |
a5efa1bb | 71 | #include "channels.h" |
7368a6c8 | 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" | |
07d80252 | 82 | #include "sshpty.h" |
e968270c | 83 | #include "misc.h" |
5e96b616 | 84 | #include "monitor_fdpass.h" |
85 | #include "match.h" | |
86 | #include "msg.h" | |
a22aff1f | 87 | |
88 | /* import options */ | |
89 | extern Options options; | |
90 | ||
8efc0c15 | 91 | /* Flag indicating that stdin should be redirected from /dev/null. */ |
92 | extern int stdin_null_flag; | |
93 | ||
66357af5 | 94 | /* Flag indicating that no shell has been requested */ |
95 | extern int no_shell_flag; | |
96 | ||
5e96b616 | 97 | /* Control socket */ |
98 | extern int control_fd; | |
99 | ||
aa3378df | 100 | /* |
101 | * Name of the host we are connecting to. This is the name given on the | |
102 | * command line, or the HostName specified for the user-supplied name in a | |
103 | * configuration file. | |
104 | */ | |
8efc0c15 | 105 | extern char *host; |
106 | ||
aa3378df | 107 | /* |
108 | * Flag to indicate that we have received a window change signal which has | |
109 | * not yet been processed. This will cause a message indicating the new | |
110 | * window size to be sent to the server a little later. This is volatile | |
111 | * because this is updated in a signal handler. | |
112 | */ | |
7a934d1b | 113 | static volatile sig_atomic_t received_window_change_signal = 0; |
114 | static volatile sig_atomic_t received_signal = 0; | |
8efc0c15 | 115 | |
8efc0c15 | 116 | /* Flag indicating whether the user\'s terminal is in non-blocking mode. */ |
117 | static int in_non_blocking_mode = 0; | |
118 | ||
119 | /* Common data for the client loop code. */ | |
2e73a022 | 120 | static int quit_pending; /* Set to non-zero to quit the client loop. */ |
121 | static int escape_char; /* Escape character. */ | |
5260325f | 122 | static int escape_pending; /* Last character was the escape character */ |
123 | static int last_was_cr; /* Last character was a newline. */ | |
124 | static int exit_status; /* Used to store the exit status of the command. */ | |
125 | static int stdin_eof; /* EOF has been encountered on standard error. */ | |
126 | static Buffer stdin_buffer; /* Buffer for stdin data. */ | |
127 | static Buffer stdout_buffer; /* Buffer for stdout data. */ | |
128 | static Buffer stderr_buffer; /* Buffer for stderr data. */ | |
1e3b8b07 | 129 | static u_long stdin_bytes, stdout_bytes, stderr_bytes; |
130 | static u_int buffer_high;/* Soft max buffer size. */ | |
5260325f | 131 | static int connection_in; /* Connection to server (input). */ |
132 | static int connection_out; /* Connection to server (output). */ | |
c422989b | 133 | static int need_rekeying; /* Set to non-zero if rekeying is requested. */ |
eb0dd41f | 134 | static int session_closed = 0; /* In SSH2: login session closed. */ |
5d8d32a3 | 135 | static int server_alive_timeouts = 0; |
8efc0c15 | 136 | |
396c147e | 137 | static void client_init_dispatch(void); |
8ce64345 | 138 | int session_ident = -1; |
139 | ||
5e96b616 | 140 | struct confirm_ctx { |
141 | int want_tty; | |
142 | int want_subsys; | |
143 | Buffer cmd; | |
144 | char *term; | |
145 | struct termios tio; | |
146 | }; | |
147 | ||
e092ce67 | 148 | /*XXX*/ |
149 | extern Kex *xxx_kex; | |
150 | ||
5e96b616 | 151 | void ssh_process_session2_setup(int, int, int, Buffer *); |
152 | ||
8efc0c15 | 153 | /* Restores stdin to blocking mode. */ |
154 | ||
396c147e | 155 | static void |
5ca51e19 | 156 | leave_non_blocking(void) |
8efc0c15 | 157 | { |
5260325f | 158 | if (in_non_blocking_mode) { |
159 | (void) fcntl(fileno(stdin), F_SETFL, 0); | |
160 | in_non_blocking_mode = 0; | |
5260325f | 161 | } |
8efc0c15 | 162 | } |
163 | ||
5260325f | 164 | /* Puts stdin terminal in non-blocking mode. */ |
165 | ||
396c147e | 166 | static void |
5ca51e19 | 167 | enter_non_blocking(void) |
8efc0c15 | 168 | { |
5260325f | 169 | in_non_blocking_mode = 1; |
170 | (void) fcntl(fileno(stdin), F_SETFL, O_NONBLOCK); | |
8efc0c15 | 171 | } |
172 | ||
aa3378df | 173 | /* |
174 | * Signal handler for the window change signal (SIGWINCH). This just sets a | |
175 | * flag indicating that the window has changed. | |
176 | */ | |
8efc0c15 | 177 | |
396c147e | 178 | static void |
5260325f | 179 | window_change_handler(int sig) |
8efc0c15 | 180 | { |
5260325f | 181 | received_window_change_signal = 1; |
182 | signal(SIGWINCH, window_change_handler); | |
8efc0c15 | 183 | } |
184 | ||
aa3378df | 185 | /* |
186 | * Signal handler for signals that cause the program to terminate. These | |
187 | * signals must be trapped to restore terminal modes. | |
188 | */ | |
8efc0c15 | 189 | |
396c147e | 190 | static void |
5260325f | 191 | signal_handler(int sig) |
8efc0c15 | 192 | { |
c9130033 | 193 | received_signal = sig; |
194 | quit_pending = 1; | |
8efc0c15 | 195 | } |
196 | ||
aa3378df | 197 | /* |
198 | * Returns current time in seconds from Jan 1, 1970 with the maximum | |
199 | * available resolution. | |
200 | */ | |
8efc0c15 | 201 | |
396c147e | 202 | static double |
5ca51e19 | 203 | get_current_time(void) |
8efc0c15 | 204 | { |
5260325f | 205 | struct timeval tv; |
206 | gettimeofday(&tv, NULL); | |
207 | return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0; | |
8efc0c15 | 208 | } |
209 | ||
aa3378df | 210 | /* |
211 | * This is called when the interactive is entered. This checks if there is | |
212 | * an EOF coming on stdin. We must check this explicitly, as select() does | |
213 | * not appear to wake up when redirecting from /dev/null. | |
214 | */ | |
8efc0c15 | 215 | |
396c147e | 216 | static void |
5ca51e19 | 217 | client_check_initial_eof_on_stdin(void) |
8efc0c15 | 218 | { |
5260325f | 219 | int len; |
220 | char buf[1]; | |
221 | ||
aa3378df | 222 | /* |
223 | * If standard input is to be "redirected from /dev/null", we simply | |
224 | * mark that we have seen an EOF and send an EOF message to the | |
225 | * server. Otherwise, we try to read a single character; it appears | |
226 | * that for some files, such /dev/null, select() never wakes up for | |
227 | * read for this descriptor, which means that we never get EOF. This | |
228 | * way we will get the EOF if stdin comes from /dev/null or similar. | |
229 | */ | |
5260325f | 230 | if (stdin_null_flag) { |
231 | /* Fake EOF on stdin. */ | |
232 | debug("Sending eof."); | |
233 | stdin_eof = 1; | |
234 | packet_start(SSH_CMSG_EOF); | |
235 | packet_send(); | |
236 | } else { | |
5260325f | 237 | enter_non_blocking(); |
238 | ||
239 | /* Check for immediate EOF on stdin. */ | |
240 | len = read(fileno(stdin), buf, 1); | |
241 | if (len == 0) { | |
aa3378df | 242 | /* EOF. Record that we have seen it and send EOF to server. */ |
5260325f | 243 | debug("Sending eof."); |
244 | stdin_eof = 1; | |
245 | packet_start(SSH_CMSG_EOF); | |
246 | packet_send(); | |
247 | } else if (len > 0) { | |
aa3378df | 248 | /* |
249 | * Got data. We must store the data in the buffer, | |
250 | * and also process it as an escape character if | |
251 | * appropriate. | |
252 | */ | |
1e3b8b07 | 253 | if ((u_char) buf[0] == escape_char) |
5260325f | 254 | escape_pending = 1; |
7e8911cd | 255 | else |
5260325f | 256 | buffer_append(&stdin_buffer, buf, 1); |
5260325f | 257 | } |
5260325f | 258 | leave_non_blocking(); |
8efc0c15 | 259 | } |
8efc0c15 | 260 | } |
261 | ||
8efc0c15 | 262 | |
aa3378df | 263 | /* |
264 | * Make packets from buffered stdin data, and buffer them for sending to the | |
265 | * connection. | |
266 | */ | |
8efc0c15 | 267 | |
396c147e | 268 | static void |
5ca51e19 | 269 | client_make_packets_from_stdin_data(void) |
8efc0c15 | 270 | { |
1e3b8b07 | 271 | u_int len; |
5260325f | 272 | |
273 | /* Send buffered stdin data to the server. */ | |
274 | while (buffer_len(&stdin_buffer) > 0 && | |
184eed6a | 275 | packet_not_very_much_data_to_write()) { |
5260325f | 276 | len = buffer_len(&stdin_buffer); |
277 | /* Keep the packets at reasonable size. */ | |
278 | if (len > packet_get_maxsize()) | |
279 | len = packet_get_maxsize(); | |
280 | packet_start(SSH_CMSG_STDIN_DATA); | |
281 | packet_put_string(buffer_ptr(&stdin_buffer), len); | |
282 | packet_send(); | |
283 | buffer_consume(&stdin_buffer, len); | |
7e8911cd | 284 | stdin_bytes += len; |
5260325f | 285 | /* If we have a pending EOF, send it now. */ |
286 | if (stdin_eof && buffer_len(&stdin_buffer) == 0) { | |
287 | packet_start(SSH_CMSG_EOF); | |
288 | packet_send(); | |
289 | } | |
8efc0c15 | 290 | } |
8efc0c15 | 291 | } |
292 | ||
aa3378df | 293 | /* |
294 | * Checks if the client window has changed, and sends a packet about it to | |
295 | * the server if so. The actual change is detected elsewhere (by a software | |
296 | * interrupt on Unix); this just checks the flag and sends a message if | |
297 | * appropriate. | |
298 | */ | |
8efc0c15 | 299 | |
396c147e | 300 | static void |
5ca51e19 | 301 | client_check_window_change(void) |
8efc0c15 | 302 | { |
8ce64345 | 303 | struct winsize ws; |
304 | ||
305 | if (! received_window_change_signal) | |
306 | return; | |
307 | /** XXX race */ | |
308 | received_window_change_signal = 0; | |
309 | ||
de273eef | 310 | debug2("client_check_window_change: changed"); |
8ce64345 | 311 | |
312 | if (compat20) { | |
5e96b616 | 313 | channel_send_window_changes(); |
8ce64345 | 314 | } else { |
5e96b616 | 315 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) |
316 | return; | |
8ce64345 | 317 | packet_start(SSH_CMSG_WINDOW_SIZE); |
318 | packet_put_int(ws.ws_row); | |
319 | packet_put_int(ws.ws_col); | |
320 | packet_put_int(ws.ws_xpixel); | |
321 | packet_put_int(ws.ws_ypixel); | |
322 | packet_send(); | |
8efc0c15 | 323 | } |
8efc0c15 | 324 | } |
325 | ||
5d8d32a3 | 326 | static void |
327 | client_global_request_reply(int type, u_int32_t seq, void *ctxt) | |
328 | { | |
329 | server_alive_timeouts = 0; | |
330 | client_global_request_reply_fwd(type, seq, ctxt); | |
331 | } | |
332 | ||
333 | static void | |
334 | server_alive_check(void) | |
335 | { | |
336 | if (++server_alive_timeouts > options.server_alive_count_max) | |
337 | packet_disconnect("Timeout, server not responding."); | |
338 | packet_start(SSH2_MSG_GLOBAL_REQUEST); | |
339 | packet_put_cstring("keepalive@openssh.com"); | |
340 | packet_put_char(1); /* boolean: want reply */ | |
341 | packet_send(); | |
342 | } | |
343 | ||
aa3378df | 344 | /* |
345 | * Waits until the client can do something (some data becomes available on | |
346 | * one of the file descriptors). | |
347 | */ | |
396c147e | 348 | static void |
39929cdb | 349 | client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp, |
489aa2e9 | 350 | int *maxfdp, int *nallocp, int rekeying) |
8efc0c15 | 351 | { |
5d8d32a3 | 352 | struct timeval tv, *tvp; |
353 | int ret; | |
354 | ||
39929cdb | 355 | /* Add any selections by the channel mechanism. */ |
489aa2e9 | 356 | channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying); |
5260325f | 357 | |
8ce64345 | 358 | if (!compat20) { |
359 | /* Read from the connection, unless our buffers are full. */ | |
360 | if (buffer_len(&stdout_buffer) < buffer_high && | |
361 | buffer_len(&stderr_buffer) < buffer_high && | |
362 | channel_not_very_much_buffered_data()) | |
39929cdb | 363 | FD_SET(connection_in, *readsetp); |
8ce64345 | 364 | /* |
365 | * Read from stdin, unless we have seen EOF or have very much | |
366 | * buffered data to send to the server. | |
367 | */ | |
368 | if (!stdin_eof && packet_not_very_much_data_to_write()) | |
39929cdb | 369 | FD_SET(fileno(stdin), *readsetp); |
8ce64345 | 370 | |
371 | /* Select stdout/stderr if have data in buffer. */ | |
372 | if (buffer_len(&stdout_buffer) > 0) | |
39929cdb | 373 | FD_SET(fileno(stdout), *writesetp); |
8ce64345 | 374 | if (buffer_len(&stderr_buffer) > 0) |
39929cdb | 375 | FD_SET(fileno(stderr), *writesetp); |
8ce64345 | 376 | } else { |
24b6b45f | 377 | /* channel_prepare_select could have closed the last channel */ |
fd6cfbaf | 378 | if (session_closed && !channel_still_open() && |
379 | !packet_have_data_to_write()) { | |
380 | /* clear mask since we did not call select() */ | |
b3ad8fe6 | 381 | memset(*readsetp, 0, *nallocp); |
382 | memset(*writesetp, 0, *nallocp); | |
fd6cfbaf | 383 | return; |
24b6b45f | 384 | } else { |
385 | FD_SET(connection_in, *readsetp); | |
386 | } | |
8ce64345 | 387 | } |
5260325f | 388 | |
5260325f | 389 | /* Select server connection if have data to write to the server. */ |
390 | if (packet_have_data_to_write()) | |
39929cdb | 391 | FD_SET(connection_out, *writesetp); |
5260325f | 392 | |
5e96b616 | 393 | if (control_fd != -1) |
394 | FD_SET(control_fd, *readsetp); | |
395 | ||
aa3378df | 396 | /* |
397 | * Wait for something to happen. This will suspend the process until | |
398 | * some selected descriptor can be read, written, or has some other | |
5d8d32a3 | 399 | * event pending. |
aa3378df | 400 | */ |
5260325f | 401 | |
5d8d32a3 | 402 | if (options.server_alive_interval == 0 || !compat20) |
403 | tvp = NULL; | |
404 | else { | |
405 | tv.tv_sec = options.server_alive_interval; | |
406 | tv.tv_usec = 0; | |
407 | tvp = &tv; | |
408 | } | |
409 | ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp); | |
410 | if (ret < 0) { | |
5260325f | 411 | char buf[100]; |
fd193ca4 | 412 | |
413 | /* | |
414 | * We have to clear the select masks, because we return. | |
415 | * We have to return, because the mainloop checks for the flags | |
416 | * set by the signal handlers. | |
417 | */ | |
b3ad8fe6 | 418 | memset(*readsetp, 0, *nallocp); |
419 | memset(*writesetp, 0, *nallocp); | |
fd193ca4 | 420 | |
5260325f | 421 | if (errno == EINTR) |
422 | return; | |
423 | /* Note: we might still have data in the buffers. */ | |
424 | snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno)); | |
425 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
5260325f | 426 | quit_pending = 1; |
5d8d32a3 | 427 | } else if (ret == 0) |
428 | server_alive_check(); | |
8efc0c15 | 429 | } |
430 | ||
396c147e | 431 | static void |
2e73a022 | 432 | client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr) |
8efc0c15 | 433 | { |
5260325f | 434 | struct winsize oldws, newws; |
435 | ||
436 | /* Flush stdout and stderr buffers. */ | |
2e73a022 | 437 | if (buffer_len(bout) > 0) |
dc54438a | 438 | atomicio(vwrite, fileno(stdout), buffer_ptr(bout), buffer_len(bout)); |
2e73a022 | 439 | if (buffer_len(berr) > 0) |
dc54438a | 440 | atomicio(vwrite, fileno(stderr), buffer_ptr(berr), buffer_len(berr)); |
5260325f | 441 | |
5260325f | 442 | leave_raw_mode(); |
443 | ||
aa3378df | 444 | /* |
445 | * Free (and clear) the buffer to reduce the amount of data that gets | |
446 | * written to swap. | |
447 | */ | |
2e73a022 | 448 | buffer_free(bin); |
449 | buffer_free(bout); | |
450 | buffer_free(berr); | |
5260325f | 451 | |
452 | /* Save old window size. */ | |
453 | ioctl(fileno(stdin), TIOCGWINSZ, &oldws); | |
454 | ||
455 | /* Send the suspend signal to the program itself. */ | |
456 | kill(getpid(), SIGTSTP); | |
457 | ||
458 | /* Check if the window size has changed. */ | |
459 | if (ioctl(fileno(stdin), TIOCGWINSZ, &newws) >= 0 && | |
460 | (oldws.ws_row != newws.ws_row || | |
184eed6a | 461 | oldws.ws_col != newws.ws_col || |
462 | oldws.ws_xpixel != newws.ws_xpixel || | |
463 | oldws.ws_ypixel != newws.ws_ypixel)) | |
5260325f | 464 | received_window_change_signal = 1; |
465 | ||
466 | /* OK, we have been continued by the user. Reinitialize buffers. */ | |
2e73a022 | 467 | buffer_init(bin); |
468 | buffer_init(bout); | |
469 | buffer_init(berr); | |
5260325f | 470 | |
5260325f | 471 | enter_raw_mode(); |
8efc0c15 | 472 | } |
473 | ||
396c147e | 474 | static void |
8ce64345 | 475 | client_process_net_input(fd_set * readset) |
8efc0c15 | 476 | { |
8ce64345 | 477 | int len; |
478 | char buf[8192]; | |
5260325f | 479 | |
aa3378df | 480 | /* |
481 | * Read input from the server, and add any such data to the buffer of | |
482 | * the packet subsystem. | |
483 | */ | |
5260325f | 484 | if (FD_ISSET(connection_in, readset)) { |
485 | /* Read as much as possible. */ | |
486 | len = read(connection_in, buf, sizeof(buf)); | |
487 | if (len == 0) { | |
488 | /* Received EOF. The remote host has closed the connection. */ | |
489 | snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n", | |
490 | host); | |
8efc0c15 | 491 | buffer_append(&stderr_buffer, buf, strlen(buf)); |
8efc0c15 | 492 | quit_pending = 1; |
493 | return; | |
5260325f | 494 | } |
aa3378df | 495 | /* |
496 | * There is a kernel bug on Solaris that causes select to | |
497 | * sometimes wake up even though there is no data available. | |
498 | */ | |
09cb311c | 499 | if (len < 0 && (errno == EAGAIN || errno == EINTR)) |
5260325f | 500 | len = 0; |
501 | ||
502 | if (len < 0) { | |
503 | /* An error has encountered. Perhaps there is a network problem. */ | |
504 | snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n", | |
505 | host, strerror(errno)); | |
506 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
5260325f | 507 | quit_pending = 1; |
508 | return; | |
509 | } | |
510 | packet_process_incoming(buf, len); | |
511 | } | |
8ce64345 | 512 | } |
513 | ||
5e96b616 | 514 | static void |
515 | client_subsystem_reply(int type, u_int32_t seq, void *ctxt) | |
516 | { | |
517 | int id; | |
518 | Channel *c; | |
519 | ||
520 | id = packet_get_int(); | |
521 | packet_check_eom(); | |
522 | ||
523 | if ((c = channel_lookup(id)) == NULL) { | |
524 | error("%s: no channel for id %d", __func__, id); | |
525 | return; | |
526 | } | |
527 | ||
528 | if (type == SSH2_MSG_CHANNEL_SUCCESS) | |
529 | debug2("Request suceeded on channel %d", id); | |
530 | else if (type == SSH2_MSG_CHANNEL_FAILURE) { | |
531 | error("Request failed on channel %d", id); | |
532 | channel_free(c); | |
533 | } | |
534 | } | |
535 | ||
536 | static void | |
537 | client_extra_session2_setup(int id, void *arg) | |
538 | { | |
539 | struct confirm_ctx *cctx = arg; | |
540 | Channel *c; | |
541 | ||
542 | if (cctx == NULL) | |
543 | fatal("%s: cctx == NULL", __func__); | |
544 | if ((c = channel_lookup(id)) == NULL) | |
545 | fatal("%s: no channel for id %d", __func__, id); | |
546 | ||
547 | client_session2_setup(id, cctx->want_tty, cctx->want_subsys, | |
548 | cctx->term, &cctx->tio, c->rfd, &cctx->cmd, | |
549 | client_subsystem_reply); | |
550 | ||
551 | c->confirm_ctx = NULL; | |
552 | buffer_free(&cctx->cmd); | |
553 | free(cctx->term); | |
554 | free(cctx); | |
555 | } | |
556 | ||
557 | static void | |
558 | client_process_control(fd_set * readset) | |
559 | { | |
560 | Buffer m; | |
561 | Channel *c; | |
562 | int client_fd, new_fd[3], ver; | |
563 | socklen_t addrlen; | |
564 | struct sockaddr_storage addr; | |
565 | struct confirm_ctx *cctx; | |
566 | char *cmd; | |
567 | u_int len; | |
568 | uid_t euid; | |
569 | gid_t egid; | |
570 | ||
571 | /* | |
572 | * Accept connection on control socket | |
573 | */ | |
574 | if (control_fd == -1 || !FD_ISSET(control_fd, readset)) | |
575 | return; | |
576 | ||
577 | memset(&addr, 0, sizeof(addr)); | |
578 | addrlen = sizeof(addr); | |
579 | if ((client_fd = accept(control_fd, | |
580 | (struct sockaddr*)&addr, &addrlen)) == -1) { | |
581 | error("%s accept: %s", __func__, strerror(errno)); | |
582 | return; | |
583 | } | |
584 | ||
585 | if (getpeereid(client_fd, &euid, &egid) < 0) { | |
586 | error("%s getpeereid failed: %s", __func__, strerror(errno)); | |
587 | close(client_fd); | |
588 | return; | |
589 | } | |
590 | if ((euid != 0) && (getuid() != euid)) { | |
591 | error("control mode uid mismatch: peer euid %u != uid %u", | |
592 | (u_int) euid, (u_int) getuid()); | |
593 | close(client_fd); | |
594 | return; | |
595 | } | |
596 | /* XXX: implement use of ssh-askpass to confirm additional channels */ | |
597 | ||
598 | unset_nonblock(client_fd); | |
599 | ||
600 | buffer_init(&m); | |
601 | ||
602 | buffer_put_int(&m, getpid()); | |
603 | if (ssh_msg_send(client_fd, /* version */0, &m) == -1) { | |
604 | error("%s: client msg_send failed", __func__); | |
605 | close(client_fd); | |
606 | return; | |
607 | } | |
608 | buffer_clear(&m); | |
609 | ||
610 | if (ssh_msg_recv(client_fd, &m) == -1) { | |
611 | error("%s: client msg_recv failed", __func__); | |
612 | close(client_fd); | |
613 | return; | |
614 | } | |
615 | ||
616 | if ((ver = buffer_get_char(&m)) != 0) { | |
617 | error("%s: wrong client version %d", __func__, ver); | |
618 | buffer_free(&m); | |
619 | close(client_fd); | |
620 | return; | |
621 | } | |
622 | ||
623 | cctx = xmalloc(sizeof(*cctx)); | |
624 | memset(cctx, 0, sizeof(*cctx)); | |
625 | ||
626 | cctx->want_tty = buffer_get_int(&m); | |
627 | cctx->want_subsys = buffer_get_int(&m); | |
628 | cctx->term = buffer_get_string(&m, &len); | |
629 | ||
630 | cmd = buffer_get_string(&m, &len); | |
631 | buffer_init(&cctx->cmd); | |
632 | buffer_append(&cctx->cmd, cmd, strlen(cmd)); | |
633 | ||
634 | debug2("%s: accepted tty %d, subsys %d, cmd %s", __func__, | |
635 | cctx->want_tty, cctx->want_subsys, cmd); | |
636 | ||
637 | /* Gather fds from client */ | |
638 | new_fd[0] = mm_receive_fd(client_fd); | |
639 | new_fd[1] = mm_receive_fd(client_fd); | |
640 | new_fd[2] = mm_receive_fd(client_fd); | |
641 | ||
642 | debug2("%s: got fds stdin %d, stdout %d, stderr %d", __func__, | |
643 | new_fd[0], new_fd[1], new_fd[2]); | |
644 | ||
645 | /* Try to pick up ttymodes from client before it goes raw */ | |
646 | if (cctx->want_tty && tcgetattr(new_fd[0], &cctx->tio) == -1) | |
647 | error("%s: tcgetattr: %s", __func__, strerror(errno)); | |
648 | ||
649 | buffer_clear(&m); | |
650 | if (ssh_msg_send(client_fd, /* version */0, &m) == -1) { | |
651 | error("%s: client msg_send failed", __func__); | |
652 | close(client_fd); | |
653 | close(new_fd[0]); | |
654 | close(new_fd[1]); | |
655 | close(new_fd[2]); | |
656 | return; | |
657 | } | |
658 | buffer_free(&m); | |
659 | ||
660 | /* enable nonblocking unless tty */ | |
661 | if (!isatty(new_fd[0])) | |
662 | set_nonblock(new_fd[0]); | |
663 | if (!isatty(new_fd[1])) | |
664 | set_nonblock(new_fd[1]); | |
665 | if (!isatty(new_fd[2])) | |
666 | set_nonblock(new_fd[2]); | |
667 | ||
668 | set_nonblock(client_fd); | |
669 | ||
670 | c = channel_new("session", SSH_CHANNEL_OPENING, | |
671 | new_fd[0], new_fd[1], new_fd[2], | |
672 | CHAN_SES_WINDOW_DEFAULT, CHAN_SES_PACKET_DEFAULT, | |
673 | CHAN_EXTENDED_WRITE, "client-session", /*nonblock*/0); | |
674 | ||
675 | /* XXX */ | |
676 | c->ctl_fd = client_fd; | |
677 | ||
678 | debug3("%s: channel_new: %d", __func__, c->self); | |
679 | ||
680 | channel_send_open(c->self); | |
681 | channel_register_confirm(c->self, client_extra_session2_setup, cctx); | |
682 | } | |
683 | ||
c53c54c2 | 684 | static void |
ec9b7086 | 685 | process_cmdline(void) |
c53c54c2 | 686 | { |
c53c54c2 | 687 | void (*handler)(int); |
688 | char *s, *cmd; | |
689 | u_short fwd_port, fwd_host_port; | |
690 | char buf[1024], sfwd_port[6], sfwd_host_port[6]; | |
d740ec16 | 691 | int delete = 0; |
c53c54c2 | 692 | int local = 0; |
c53c54c2 | 693 | |
694 | leave_raw_mode(); | |
875ec275 | 695 | handler = signal(SIGINT, SIG_IGN); |
ec9b7086 | 696 | cmd = s = read_passphrase("\r\nssh> ", RP_ECHO); |
c53c54c2 | 697 | if (s == NULL) |
698 | goto out; | |
c53c54c2 | 699 | while (*s && isspace(*s)) |
700 | s++; | |
d740ec16 | 701 | if (*s == '-') |
702 | s++; /* Skip cmdline '-', if any */ | |
27c6fcae | 703 | if (*s == '\0') |
c53c54c2 | 704 | goto out; |
d740ec16 | 705 | |
7069a5e2 | 706 | if (*s == 'h' || *s == 'H' || *s == '?') { |
d740ec16 | 707 | logit("Commands:"); |
708 | logit(" -Lport:host:hostport Request local forward"); | |
709 | logit(" -Rport:host:hostport Request remote forward"); | |
710 | logit(" -KRhostport Cancel remote forward"); | |
711 | goto out; | |
712 | } | |
713 | ||
714 | if (*s == 'K') { | |
715 | delete = 1; | |
716 | s++; | |
717 | } | |
718 | if (*s != 'L' && *s != 'R') { | |
bbe88b6d | 719 | logit("Invalid command."); |
c53c54c2 | 720 | goto out; |
721 | } | |
d740ec16 | 722 | if (*s == 'L') |
c53c54c2 | 723 | local = 1; |
d740ec16 | 724 | if (local && delete) { |
725 | logit("Not supported."); | |
726 | goto out; | |
727 | } | |
728 | if ((!local || delete) && !compat20) { | |
bbe88b6d | 729 | logit("Not supported for SSH protocol version 1."); |
c53c54c2 | 730 | goto out; |
731 | } | |
d740ec16 | 732 | |
733 | s++; | |
c53c54c2 | 734 | while (*s && isspace(*s)) |
735 | s++; | |
736 | ||
d740ec16 | 737 | if (delete) { |
738 | if (sscanf(s, "%5[0-9]", sfwd_host_port) != 1) { | |
739 | logit("Bad forwarding specification."); | |
740 | goto out; | |
741 | } | |
742 | if ((fwd_host_port = a2port(sfwd_host_port)) == 0) { | |
743 | logit("Bad forwarding port(s)."); | |
c53c54c2 | 744 | goto out; |
745 | } | |
d740ec16 | 746 | channel_request_rforward_cancel(fwd_host_port); |
747 | } else { | |
748 | if (sscanf(s, "%5[0-9]:%255[^:]:%5[0-9]", | |
749 | sfwd_port, buf, sfwd_host_port) != 3 && | |
750 | sscanf(s, "%5[0-9]/%255[^/]/%5[0-9]", | |
751 | sfwd_port, buf, sfwd_host_port) != 3) { | |
752 | logit("Bad forwarding specification."); | |
753 | goto out; | |
754 | } | |
755 | if ((fwd_port = a2port(sfwd_port)) == 0 || | |
756 | (fwd_host_port = a2port(sfwd_host_port)) == 0) { | |
757 | logit("Bad forwarding port(s)."); | |
758 | goto out; | |
759 | } | |
760 | if (local) { | |
761 | if (channel_setup_local_fwd_listener(fwd_port, buf, | |
762 | fwd_host_port, options.gateway_ports) < 0) { | |
763 | logit("Port forwarding failed."); | |
764 | goto out; | |
765 | } | |
766 | } else | |
767 | channel_request_remote_forwarding(fwd_port, buf, | |
768 | fwd_host_port); | |
769 | logit("Forwarding port."); | |
770 | } | |
771 | ||
c53c54c2 | 772 | out: |
773 | signal(SIGINT, handler); | |
774 | enter_raw_mode(); | |
775 | if (cmd) | |
776 | xfree(cmd); | |
777 | } | |
778 | ||
2e73a022 | 779 | /* process the characters one by one */ |
396c147e | 780 | static int |
2e73a022 | 781 | process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len) |
782 | { | |
783 | char string[1024]; | |
784 | pid_t pid; | |
785 | int bytes = 0; | |
1e3b8b07 | 786 | u_int i; |
787 | u_char ch; | |
2e73a022 | 788 | char *s; |
789 | ||
790 | for (i = 0; i < len; i++) { | |
791 | /* Get one character at a time. */ | |
792 | ch = buf[i]; | |
793 | ||
794 | if (escape_pending) { | |
795 | /* We have previously seen an escape character. */ | |
796 | /* Clear the flag now. */ | |
797 | escape_pending = 0; | |
798 | ||
799 | /* Process the escaped character. */ | |
800 | switch (ch) { | |
801 | case '.': | |
802 | /* Terminate the connection. */ | |
803 | snprintf(string, sizeof string, "%c.\r\n", escape_char); | |
804 | buffer_append(berr, string, strlen(string)); | |
2e73a022 | 805 | |
806 | quit_pending = 1; | |
807 | return -1; | |
808 | ||
809 | case 'Z' - 64: | |
810 | /* Suspend the program. */ | |
811 | /* Print a message to that effect to the user. */ | |
812 | snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char); | |
813 | buffer_append(berr, string, strlen(string)); | |
2e73a022 | 814 | |
815 | /* Restore terminal modes and suspend. */ | |
816 | client_suspend_self(bin, bout, berr); | |
817 | ||
818 | /* We have been continued. */ | |
819 | continue; | |
820 | ||
16a79097 | 821 | case 'B': |
822 | if (compat20) { | |
823 | snprintf(string, sizeof string, | |
824 | "%cB\r\n", escape_char); | |
825 | buffer_append(berr, string, | |
826 | strlen(string)); | |
827 | channel_request_start(session_ident, | |
828 | "break", 0); | |
829 | packet_put_int(1000); | |
830 | packet_send(); | |
831 | } | |
832 | continue; | |
833 | ||
e092ce67 | 834 | case 'R': |
54506d2e | 835 | if (compat20) { |
836 | if (datafellows & SSH_BUG_NOREKEY) | |
bbe88b6d | 837 | logit("Server does not support re-keying"); |
54506d2e | 838 | else |
839 | need_rekeying = 1; | |
840 | } | |
e092ce67 | 841 | continue; |
842 | ||
2e73a022 | 843 | case '&': |
2e73a022 | 844 | /* |
845 | * Detach the program (continue to serve connections, | |
846 | * but put in background and no more new connections). | |
847 | */ | |
2e73a022 | 848 | /* Restore tty modes. */ |
849 | leave_raw_mode(); | |
850 | ||
851 | /* Stop listening for new connections. */ | |
c6940381 | 852 | channel_stop_listening(); |
2e73a022 | 853 | |
c6940381 | 854 | snprintf(string, sizeof string, |
855 | "%c& [backgrounded]\n", escape_char); | |
856 | buffer_append(berr, string, strlen(string)); | |
2e73a022 | 857 | |
858 | /* Fork into background. */ | |
859 | pid = fork(); | |
860 | if (pid < 0) { | |
861 | error("fork: %.100s", strerror(errno)); | |
862 | continue; | |
863 | } | |
864 | if (pid != 0) { /* This is the parent. */ | |
865 | /* The parent just exits. */ | |
866 | exit(0); | |
867 | } | |
868 | /* The child continues serving connections. */ | |
c6940381 | 869 | if (compat20) { |
870 | buffer_append(bin, "\004", 1); | |
871 | /* fake EOF on stdin */ | |
872 | return -1; | |
873 | } else if (!stdin_eof) { | |
874 | /* | |
875 | * Sending SSH_CMSG_EOF alone does not always appear | |
876 | * to be enough. So we try to send an EOF character | |
877 | * first. | |
878 | */ | |
879 | packet_start(SSH_CMSG_STDIN_DATA); | |
880 | packet_put_string("\004", 1); | |
881 | packet_send(); | |
882 | /* Close stdin. */ | |
883 | stdin_eof = 1; | |
884 | if (buffer_len(bin) == 0) { | |
885 | packet_start(SSH_CMSG_EOF); | |
886 | packet_send(); | |
887 | } | |
888 | } | |
889 | continue; | |
2e73a022 | 890 | |
891 | case '?': | |
892 | snprintf(string, sizeof string, | |
893 | "%c?\r\n\ | |
894 | Supported escape sequences:\r\n\ | |
1d77f8cb | 895 | %c. - terminate connection\r\n\ |
16a79097 | 896 | %cB - send a BREAK to the remote system\r\n\ |
1d77f8cb | 897 | %cC - open a command line\r\n\ |
898 | %cR - Request rekey (SSH protocol 2 only)\r\n\ | |
899 | %c^Z - suspend ssh\r\n\ | |
900 | %c# - list forwarded connections\r\n\ | |
901 | %c& - background ssh (when waiting for connections to terminate)\r\n\ | |
902 | %c? - this message\r\n\ | |
903 | %c%c - send the escape character by typing it twice\r\n\ | |
2e73a022 | 904 | (Note that escapes are only recognized immediately after newline.)\r\n", |
1d77f8cb | 905 | escape_char, escape_char, escape_char, escape_char, |
906 | escape_char, escape_char, escape_char, escape_char, | |
16a79097 | 907 | escape_char, escape_char, escape_char); |
2e73a022 | 908 | buffer_append(berr, string, strlen(string)); |
909 | continue; | |
910 | ||
911 | case '#': | |
912 | snprintf(string, sizeof string, "%c#\r\n", escape_char); | |
913 | buffer_append(berr, string, strlen(string)); | |
914 | s = channel_open_message(); | |
915 | buffer_append(berr, s, strlen(s)); | |
916 | xfree(s); | |
917 | continue; | |
918 | ||
c53c54c2 | 919 | case 'C': |
ec9b7086 | 920 | process_cmdline(); |
c53c54c2 | 921 | continue; |
922 | ||
2e73a022 | 923 | default: |
924 | if (ch != escape_char) { | |
925 | buffer_put_char(bin, escape_char); | |
926 | bytes++; | |
927 | } | |
928 | /* Escaped characters fall through here */ | |
929 | break; | |
930 | } | |
931 | } else { | |
932 | /* | |
933 | * The previous character was not an escape char. Check if this | |
934 | * is an escape. | |
935 | */ | |
936 | if (last_was_cr && ch == escape_char) { | |
937 | /* It is. Set the flag and continue to next character. */ | |
938 | escape_pending = 1; | |
939 | continue; | |
940 | } | |
941 | } | |
942 | ||
943 | /* | |
944 | * Normal character. Record whether it was a newline, | |
945 | * and append it to the buffer. | |
946 | */ | |
947 | last_was_cr = (ch == '\r' || ch == '\n'); | |
948 | buffer_put_char(bin, ch); | |
949 | bytes++; | |
950 | } | |
951 | return bytes; | |
952 | } | |
953 | ||
396c147e | 954 | static void |
8ce64345 | 955 | client_process_input(fd_set * readset) |
956 | { | |
9da5c3c9 | 957 | int len; |
2e73a022 | 958 | char buf[8192]; |
8ce64345 | 959 | |
5260325f | 960 | /* Read input from stdin. */ |
961 | if (FD_ISSET(fileno(stdin), readset)) { | |
962 | /* Read as much as possible. */ | |
963 | len = read(fileno(stdin), buf, sizeof(buf)); | |
cf6bc93c | 964 | if (len < 0 && (errno == EAGAIN || errno == EINTR)) |
965 | return; /* we'll try again later */ | |
5260325f | 966 | if (len <= 0) { |
aa3378df | 967 | /* |
968 | * Received EOF or error. They are treated | |
969 | * similarly, except that an error message is printed | |
970 | * if it was an error condition. | |
971 | */ | |
5260325f | 972 | if (len < 0) { |
973 | snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno)); | |
974 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
5260325f | 975 | } |
976 | /* Mark that we have seen EOF. */ | |
977 | stdin_eof = 1; | |
aa3378df | 978 | /* |
979 | * Send an EOF message to the server unless there is | |
980 | * data in the buffer. If there is data in the | |
981 | * buffer, no message will be sent now. Code | |
982 | * elsewhere will send the EOF when the buffer | |
983 | * becomes empty if stdin_eof is set. | |
984 | */ | |
5260325f | 985 | if (buffer_len(&stdin_buffer) == 0) { |
8efc0c15 | 986 | packet_start(SSH_CMSG_EOF); |
987 | packet_send(); | |
5260325f | 988 | } |
4bf9c10e | 989 | } else if (escape_char == SSH_ESCAPECHAR_NONE) { |
aa3378df | 990 | /* |
991 | * Normal successful read, and no escape character. | |
992 | * Just append the data to buffer. | |
993 | */ | |
5260325f | 994 | buffer_append(&stdin_buffer, buf, len); |
5260325f | 995 | } else { |
aa3378df | 996 | /* |
997 | * Normal, successful read. But we have an escape character | |
998 | * and have to process the characters one by one. | |
999 | */ | |
7e8911cd | 1000 | if (process_escapes(&stdin_buffer, &stdout_buffer, |
1001 | &stderr_buffer, buf, len) == -1) | |
2e73a022 | 1002 | return; |
5260325f | 1003 | } |
1004 | } | |
8efc0c15 | 1005 | } |
1006 | ||
396c147e | 1007 | static void |
5260325f | 1008 | client_process_output(fd_set * writeset) |
8efc0c15 | 1009 | { |
5260325f | 1010 | int len; |
1011 | char buf[100]; | |
1012 | ||
1013 | /* Write buffered output to stdout. */ | |
1014 | if (FD_ISSET(fileno(stdout), writeset)) { | |
1015 | /* Write as much data as possible. */ | |
1016 | len = write(fileno(stdout), buffer_ptr(&stdout_buffer), | |
a408af76 | 1017 | buffer_len(&stdout_buffer)); |
5260325f | 1018 | if (len <= 0) { |
cf6bc93c | 1019 | if (errno == EINTR || errno == EAGAIN) |
5260325f | 1020 | len = 0; |
1021 | else { | |
aa3378df | 1022 | /* |
1023 | * An error or EOF was encountered. Put an | |
1024 | * error message to stderr buffer. | |
1025 | */ | |
5260325f | 1026 | snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno)); |
1027 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
5260325f | 1028 | quit_pending = 1; |
1029 | return; | |
1030 | } | |
1031 | } | |
1032 | /* Consume printed data from the buffer. */ | |
1033 | buffer_consume(&stdout_buffer, len); | |
cd332296 | 1034 | stdout_bytes += len; |
5260325f | 1035 | } |
1036 | /* Write buffered output to stderr. */ | |
1037 | if (FD_ISSET(fileno(stderr), writeset)) { | |
1038 | /* Write as much data as possible. */ | |
1039 | len = write(fileno(stderr), buffer_ptr(&stderr_buffer), | |
a408af76 | 1040 | buffer_len(&stderr_buffer)); |
5260325f | 1041 | if (len <= 0) { |
cf6bc93c | 1042 | if (errno == EINTR || errno == EAGAIN) |
5260325f | 1043 | len = 0; |
1044 | else { | |
aa3378df | 1045 | /* EOF or error, but can't even print error message. */ |
5260325f | 1046 | quit_pending = 1; |
1047 | return; | |
1048 | } | |
1049 | } | |
1050 | /* Consume printed characters from the buffer. */ | |
1051 | buffer_consume(&stderr_buffer, len); | |
cd332296 | 1052 | stderr_bytes += len; |
8efc0c15 | 1053 | } |
8efc0c15 | 1054 | } |
1055 | ||
7368a6c8 | 1056 | /* |
1057 | * Get packets from the connection input buffer, and process them as long as | |
1058 | * there are packets available. | |
1059 | * | |
1060 | * Any unknown packets received during the actual | |
1061 | * session cause the session to terminate. This is | |
1062 | * intended to make debugging easier since no | |
1063 | * confirmations are sent. Any compatible protocol | |
1064 | * extensions must be negotiated during the | |
1065 | * preparatory phase. | |
1066 | */ | |
1067 | ||
396c147e | 1068 | static void |
5ca51e19 | 1069 | client_process_buffered_input_packets(void) |
7368a6c8 | 1070 | { |
e092ce67 | 1071 | dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL); |
7368a6c8 | 1072 | } |
1073 | ||
2e73a022 | 1074 | /* scan buf[] for '~' before sending data to the peer */ |
1075 | ||
396c147e | 1076 | static int |
2e73a022 | 1077 | simple_escape_filter(Channel *c, char *buf, int len) |
1078 | { | |
1079 | /* XXX we assume c->extended is writeable */ | |
1080 | return process_escapes(&c->input, &c->output, &c->extended, buf, len); | |
1081 | } | |
1082 | ||
396c147e | 1083 | static void |
eb0dd41f | 1084 | client_channel_closed(int id, void *arg) |
1085 | { | |
418e724c | 1086 | channel_cancel_cleanup(id); |
eb0dd41f | 1087 | session_closed = 1; |
82de775c | 1088 | leave_raw_mode(); |
eb0dd41f | 1089 | } |
1090 | ||
aa3378df | 1091 | /* |
1092 | * Implements the interactive session with the server. This is called after | |
1093 | * the user has been authenticated, and a command has been started on the | |
4bf9c10e | 1094 | * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character |
1095 | * used as an escape character for terminating or suspending the session. | |
aa3378df | 1096 | */ |
8efc0c15 | 1097 | |
6ae2364d | 1098 | int |
2e73a022 | 1099 | client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id) |
8efc0c15 | 1100 | { |
39929cdb | 1101 | fd_set *readset = NULL, *writeset = NULL; |
5260325f | 1102 | double start_time, total_time; |
489aa2e9 | 1103 | int max_fd = 0, max_fd2 = 0, len, rekeying = 0, nalloc = 0; |
5260325f | 1104 | char buf[100]; |
1105 | ||
1106 | debug("Entering interactive session."); | |
1107 | ||
1108 | start_time = get_current_time(); | |
1109 | ||
1110 | /* Initialize variables. */ | |
1111 | escape_pending = 0; | |
1112 | last_was_cr = 1; | |
1113 | exit_status = -1; | |
1114 | stdin_eof = 0; | |
1115 | buffer_high = 64 * 1024; | |
1116 | connection_in = packet_get_connection_in(); | |
1117 | connection_out = packet_get_connection_out(); | |
39929cdb | 1118 | max_fd = MAX(connection_in, connection_out); |
5e96b616 | 1119 | if (control_fd != -1) |
1120 | max_fd = MAX(max_fd, control_fd); | |
39929cdb | 1121 | |
1122 | if (!compat20) { | |
e968270c | 1123 | /* enable nonblocking unless tty */ |
1124 | if (!isatty(fileno(stdin))) | |
1125 | set_nonblock(fileno(stdin)); | |
1126 | if (!isatty(fileno(stdout))) | |
1127 | set_nonblock(fileno(stdout)); | |
1128 | if (!isatty(fileno(stderr))) | |
1129 | set_nonblock(fileno(stderr)); | |
39929cdb | 1130 | max_fd = MAX(max_fd, fileno(stdin)); |
1131 | max_fd = MAX(max_fd, fileno(stdout)); | |
1132 | max_fd = MAX(max_fd, fileno(stderr)); | |
1133 | } | |
5260325f | 1134 | stdin_bytes = 0; |
1135 | stdout_bytes = 0; | |
1136 | stderr_bytes = 0; | |
1137 | quit_pending = 0; | |
1138 | escape_char = escape_char_arg; | |
1139 | ||
1140 | /* Initialize buffers. */ | |
1141 | buffer_init(&stdin_buffer); | |
1142 | buffer_init(&stdout_buffer); | |
1143 | buffer_init(&stderr_buffer); | |
1144 | ||
7368a6c8 | 1145 | client_init_dispatch(); |
1146 | ||
3c93c917 | 1147 | /* |
1148 | * Set signal handlers, (e.g. to restore non-blocking mode) | |
1149 | * but don't overwrite SIG_IGN, matches behaviour from rsh(1) | |
1150 | */ | |
1151 | if (signal(SIGINT, SIG_IGN) != SIG_IGN) | |
1152 | signal(SIGINT, signal_handler); | |
1153 | if (signal(SIGQUIT, SIG_IGN) != SIG_IGN) | |
1154 | signal(SIGQUIT, signal_handler); | |
1155 | if (signal(SIGTERM, SIG_IGN) != SIG_IGN) | |
1156 | signal(SIGTERM, signal_handler); | |
5260325f | 1157 | if (have_pty) |
1158 | signal(SIGWINCH, window_change_handler); | |
1159 | ||
5260325f | 1160 | if (have_pty) |
1161 | enter_raw_mode(); | |
1162 | ||
1fc8ccdf | 1163 | if (compat20) { |
1164 | session_ident = ssh2_chan_id; | |
4bf9c10e | 1165 | if (escape_char != SSH_ESCAPECHAR_NONE) |
1fc8ccdf | 1166 | channel_register_filter(session_ident, |
1167 | simple_escape_filter); | |
eb0dd41f | 1168 | if (session_ident != -1) |
1169 | channel_register_cleanup(session_ident, | |
1170 | client_channel_closed); | |
1fc8ccdf | 1171 | } else { |
1172 | /* Check if we should immediately send eof on stdin. */ | |
8ce64345 | 1173 | client_check_initial_eof_on_stdin(); |
1fc8ccdf | 1174 | } |
2e73a022 | 1175 | |
5260325f | 1176 | /* Main loop of the client for the interactive session mode. */ |
1177 | while (!quit_pending) { | |
5260325f | 1178 | |
aa3378df | 1179 | /* Process buffered packets sent by the server. */ |
5260325f | 1180 | client_process_buffered_input_packets(); |
1181 | ||
eb0dd41f | 1182 | if (compat20 && session_closed && !channel_still_open()) |
8ce64345 | 1183 | break; |
eb0dd41f | 1184 | |
1185 | rekeying = (xxx_kex != NULL && !xxx_kex->done); | |
8ce64345 | 1186 | |
c422989b | 1187 | if (rekeying) { |
1188 | debug("rekeying in progress"); | |
1189 | } else { | |
1190 | /* | |
1191 | * Make packets of buffered stdin data, and buffer | |
1192 | * them for sending to the server. | |
1193 | */ | |
1194 | if (!compat20) | |
1195 | client_make_packets_from_stdin_data(); | |
5260325f | 1196 | |
c422989b | 1197 | /* |
1198 | * Make packets from buffered channel data, and | |
1199 | * enqueue them for sending to the server. | |
1200 | */ | |
1201 | if (packet_not_very_much_data_to_write()) | |
1202 | channel_output_poll(); | |
5260325f | 1203 | |
c422989b | 1204 | /* |
1205 | * Check if the window size has changed, and buffer a | |
1206 | * message about it to the server if so. | |
1207 | */ | |
1208 | client_check_window_change(); | |
5260325f | 1209 | |
c422989b | 1210 | if (quit_pending) |
1211 | break; | |
1212 | } | |
aa3378df | 1213 | /* |
1214 | * Wait until we have something to do (something becomes | |
1215 | * available on one of the descriptors). | |
1216 | */ | |
489aa2e9 | 1217 | max_fd2 = max_fd; |
c422989b | 1218 | client_wait_until_can_do_something(&readset, &writeset, |
489aa2e9 | 1219 | &max_fd2, &nalloc, rekeying); |
5260325f | 1220 | |
1221 | if (quit_pending) | |
1222 | break; | |
1223 | ||
c422989b | 1224 | /* Do channel operations unless rekeying in progress. */ |
1225 | if (!rekeying) { | |
1226 | channel_after_select(readset, writeset); | |
ffd7b36b | 1227 | if (need_rekeying || packet_need_rekeying()) { |
1228 | debug("need rekeying"); | |
c422989b | 1229 | xxx_kex->done = 0; |
1230 | kex_send_kexinit(xxx_kex); | |
1231 | need_rekeying = 0; | |
1232 | } | |
1233 | } | |
5260325f | 1234 | |
8ce64345 | 1235 | /* Buffer input from the connection. */ |
39929cdb | 1236 | client_process_net_input(readset); |
5260325f | 1237 | |
5e96b616 | 1238 | /* Accept control connections. */ |
1239 | client_process_control(readset); | |
1240 | ||
8ce64345 | 1241 | if (quit_pending) |
1242 | break; | |
1243 | ||
1244 | if (!compat20) { | |
1245 | /* Buffer data from stdin */ | |
39929cdb | 1246 | client_process_input(readset); |
8ce64345 | 1247 | /* |
1248 | * Process output to stdout and stderr. Output to | |
1249 | * the connection is processed elsewhere (above). | |
1250 | */ | |
39929cdb | 1251 | client_process_output(writeset); |
8ce64345 | 1252 | } |
5260325f | 1253 | |
aa3378df | 1254 | /* Send as much buffered packet data as possible to the sender. */ |
39929cdb | 1255 | if (FD_ISSET(connection_out, writeset)) |
5260325f | 1256 | packet_write_poll(); |
1257 | } | |
39929cdb | 1258 | if (readset) |
1259 | xfree(readset); | |
1260 | if (writeset) | |
1261 | xfree(writeset); | |
5260325f | 1262 | |
1263 | /* Terminate the session. */ | |
1264 | ||
1265 | /* Stop watching for window change. */ | |
1266 | if (have_pty) | |
1267 | signal(SIGWINCH, SIG_DFL); | |
1268 | ||
d6746a0b | 1269 | channel_free_all(); |
5260325f | 1270 | |
c9130033 | 1271 | if (have_pty) |
1272 | leave_raw_mode(); | |
89aa792b | 1273 | |
1274 | /* restore blocking io */ | |
1275 | if (!isatty(fileno(stdin))) | |
1276 | unset_nonblock(fileno(stdin)); | |
1277 | if (!isatty(fileno(stdout))) | |
1278 | unset_nonblock(fileno(stdout)); | |
1279 | if (!isatty(fileno(stderr))) | |
1280 | unset_nonblock(fileno(stderr)); | |
1281 | ||
66357af5 | 1282 | /* |
1283 | * If there was no shell or command requested, there will be no remote | |
1284 | * exit status to be returned. In that case, clear error code if the | |
1285 | * connection was deliberately terminated at this end. | |
1286 | */ | |
1287 | if (no_shell_flag && received_signal == SIGTERM) { | |
1288 | received_signal = 0; | |
1289 | exit_status = 0; | |
1290 | } | |
1291 | ||
82de775c | 1292 | if (received_signal) |
010f9726 | 1293 | fatal("Killed by signal %d.", (int) received_signal); |
c9130033 | 1294 | |
1295 | /* | |
1296 | * In interactive mode (with pseudo tty) display a message indicating | |
1297 | * that the connection has been closed. | |
1298 | */ | |
1299 | if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) { | |
1300 | snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host); | |
1301 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
1302 | } | |
1303 | ||
5260325f | 1304 | /* Output any buffered data for stdout. */ |
89aa792b | 1305 | while (buffer_len(&stdout_buffer) > 0) { |
1306 | len = write(fileno(stdout), buffer_ptr(&stdout_buffer), | |
a408af76 | 1307 | buffer_len(&stdout_buffer)); |
89aa792b | 1308 | if (len <= 0) { |
5260325f | 1309 | error("Write failed flushing stdout buffer."); |
89aa792b | 1310 | break; |
1311 | } | |
5260325f | 1312 | buffer_consume(&stdout_buffer, len); |
cd332296 | 1313 | stdout_bytes += len; |
8efc0c15 | 1314 | } |
5260325f | 1315 | |
1316 | /* Output any buffered data for stderr. */ | |
89aa792b | 1317 | while (buffer_len(&stderr_buffer) > 0) { |
1318 | len = write(fileno(stderr), buffer_ptr(&stderr_buffer), | |
a408af76 | 1319 | buffer_len(&stderr_buffer)); |
89aa792b | 1320 | if (len <= 0) { |
5260325f | 1321 | error("Write failed flushing stderr buffer."); |
89aa792b | 1322 | break; |
1323 | } | |
5260325f | 1324 | buffer_consume(&stderr_buffer, len); |
cd332296 | 1325 | stderr_bytes += len; |
5260325f | 1326 | } |
1327 | ||
5260325f | 1328 | /* Clear and free any buffers. */ |
1329 | memset(buf, 0, sizeof(buf)); | |
1330 | buffer_free(&stdin_buffer); | |
1331 | buffer_free(&stdout_buffer); | |
1332 | buffer_free(&stderr_buffer); | |
1333 | ||
1334 | /* Report bytes transferred, and transfer rates. */ | |
1335 | total_time = get_current_time() - start_time; | |
1336 | debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds", | |
184eed6a | 1337 | stdin_bytes, stdout_bytes, stderr_bytes, total_time); |
5260325f | 1338 | if (total_time > 0) |
1339 | debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f", | |
184eed6a | 1340 | stdin_bytes / total_time, stdout_bytes / total_time, |
1341 | stderr_bytes / total_time); | |
5260325f | 1342 | |
1343 | /* Return the exit status of the program. */ | |
1344 | debug("Exit status %d", exit_status); | |
1345 | return exit_status; | |
8efc0c15 | 1346 | } |
7368a6c8 | 1347 | |
1348 | /*********/ | |
1349 | ||
396c147e | 1350 | static void |
7819b5c3 | 1351 | client_input_stdout_data(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 1352 | { |
1e3b8b07 | 1353 | u_int data_len; |
7368a6c8 | 1354 | char *data = packet_get_string(&data_len); |
95500969 | 1355 | packet_check_eom(); |
7368a6c8 | 1356 | buffer_append(&stdout_buffer, data, data_len); |
7368a6c8 | 1357 | memset(data, 0, data_len); |
1358 | xfree(data); | |
1359 | } | |
396c147e | 1360 | static void |
7819b5c3 | 1361 | client_input_stderr_data(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 1362 | { |
1e3b8b07 | 1363 | u_int data_len; |
7368a6c8 | 1364 | char *data = packet_get_string(&data_len); |
95500969 | 1365 | packet_check_eom(); |
7368a6c8 | 1366 | buffer_append(&stderr_buffer, data, data_len); |
7368a6c8 | 1367 | memset(data, 0, data_len); |
1368 | xfree(data); | |
1369 | } | |
396c147e | 1370 | static void |
7819b5c3 | 1371 | client_input_exit_status(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 1372 | { |
7368a6c8 | 1373 | exit_status = packet_get_int(); |
95500969 | 1374 | packet_check_eom(); |
7368a6c8 | 1375 | /* Acknowledge the exit. */ |
1376 | packet_start(SSH_CMSG_EXIT_CONFIRMATION); | |
1377 | packet_send(); | |
1378 | /* | |
1379 | * Must wait for packet to be sent since we are | |
1380 | * exiting the loop. | |
1381 | */ | |
1382 | packet_write_wait(); | |
1383 | /* Flag that we want to exit. */ | |
1384 | quit_pending = 1; | |
1385 | } | |
c15706e2 | 1386 | static void |
1387 | client_input_agent_open(int type, u_int32_t seq, void *ctxt) | |
1388 | { | |
1389 | Channel *c = NULL; | |
1390 | int remote_id, sock; | |
1391 | ||
1392 | /* Read the remote channel number from the message. */ | |
1393 | remote_id = packet_get_int(); | |
1394 | packet_check_eom(); | |
1395 | ||
1396 | /* | |
1397 | * Get a connection to the local authentication agent (this may again | |
1398 | * get forwarded). | |
1399 | */ | |
1400 | sock = ssh_get_authentication_socket(); | |
1401 | ||
1402 | /* | |
1403 | * If we could not connect the agent, send an error message back to | |
1404 | * the server. This should never happen unless the agent dies, | |
1405 | * because authentication forwarding is only enabled if we have an | |
1406 | * agent. | |
1407 | */ | |
1408 | if (sock >= 0) { | |
1409 | c = channel_new("", SSH_CHANNEL_OPEN, sock, sock, | |
1410 | -1, 0, 0, 0, "authentication agent connection", 1); | |
1411 | c->remote_id = remote_id; | |
1412 | c->force_drain = 1; | |
1413 | } | |
1414 | if (c == NULL) { | |
1415 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
1416 | packet_put_int(remote_id); | |
1417 | } else { | |
1418 | /* Send a confirmation to the remote host. */ | |
1419 | debug("Forwarding authentication connection."); | |
1420 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1421 | packet_put_int(remote_id); | |
1422 | packet_put_int(c->self); | |
1423 | } | |
1424 | packet_send(); | |
1425 | } | |
7368a6c8 | 1426 | |
396c147e | 1427 | static Channel * |
fa08c86b | 1428 | client_request_forwarded_tcpip(const char *request_type, int rchan) |
1429 | { | |
343288b8 | 1430 | Channel *c = NULL; |
fa08c86b | 1431 | char *listen_address, *originator_address; |
1432 | int listen_port, originator_port; | |
719fc62f | 1433 | int sock; |
fa08c86b | 1434 | |
1435 | /* Get rest of the packet */ | |
1436 | listen_address = packet_get_string(NULL); | |
1437 | listen_port = packet_get_int(); | |
1438 | originator_address = packet_get_string(NULL); | |
1439 | originator_port = packet_get_int(); | |
95500969 | 1440 | packet_check_eom(); |
fa08c86b | 1441 | |
1442 | debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d", | |
1443 | listen_address, listen_port, originator_address, originator_port); | |
1444 | ||
b3f8a79c | 1445 | sock = channel_connect_by_listen_address(listen_port); |
719fc62f | 1446 | if (sock < 0) { |
1447 | xfree(originator_address); | |
1448 | xfree(listen_address); | |
1449 | return NULL; | |
1450 | } | |
1451 | c = channel_new("forwarded-tcpip", | |
1452 | SSH_CHANNEL_CONNECTING, sock, sock, -1, | |
1453 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0, | |
0d942eff | 1454 | originator_address, 1); |
fa08c86b | 1455 | xfree(originator_address); |
1456 | xfree(listen_address); | |
1457 | return c; | |
1458 | } | |
1459 | ||
343288b8 | 1460 | static Channel * |
fa08c86b | 1461 | client_request_x11(const char *request_type, int rchan) |
1462 | { | |
1463 | Channel *c = NULL; | |
1464 | char *originator; | |
1465 | int originator_port; | |
719fc62f | 1466 | int sock; |
fa08c86b | 1467 | |
1468 | if (!options.forward_x11) { | |
1469 | error("Warning: ssh server tried X11 forwarding."); | |
1470 | error("Warning: this is probably a break in attempt by a malicious server."); | |
1471 | return NULL; | |
1472 | } | |
1473 | originator = packet_get_string(NULL); | |
1474 | if (datafellows & SSH_BUG_X11FWD) { | |
1475 | debug2("buggy server: x11 request w/o originator_port"); | |
1476 | originator_port = 0; | |
1477 | } else { | |
1478 | originator_port = packet_get_int(); | |
1479 | } | |
95500969 | 1480 | packet_check_eom(); |
fa08c86b | 1481 | /* XXX check permission */ |
865ac82e | 1482 | debug("client_request_x11: request from %s %d", originator, |
1483 | originator_port); | |
719fc62f | 1484 | xfree(originator); |
fa08c86b | 1485 | sock = x11_connect_display(); |
719fc62f | 1486 | if (sock < 0) |
1487 | return NULL; | |
1488 | c = channel_new("x11", | |
1489 | SSH_CHANNEL_X11_OPEN, sock, sock, -1, | |
0d942eff | 1490 | CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1); |
a5f82435 | 1491 | c->force_drain = 1; |
fa08c86b | 1492 | return c; |
1493 | } | |
1494 | ||
343288b8 | 1495 | static Channel * |
fa08c86b | 1496 | client_request_agent(const char *request_type, int rchan) |
1497 | { | |
1498 | Channel *c = NULL; | |
719fc62f | 1499 | int sock; |
fa08c86b | 1500 | |
1501 | if (!options.forward_agent) { | |
1502 | error("Warning: ssh server tried agent forwarding."); | |
1503 | error("Warning: this is probably a break in attempt by a malicious server."); | |
1504 | return NULL; | |
1505 | } | |
1506 | sock = ssh_get_authentication_socket(); | |
719fc62f | 1507 | if (sock < 0) |
1508 | return NULL; | |
1509 | c = channel_new("authentication agent connection", | |
1510 | SSH_CHANNEL_OPEN, sock, sock, -1, | |
1511 | CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0, | |
0d942eff | 1512 | "authentication agent connection", 1); |
a5f82435 | 1513 | c->force_drain = 1; |
fa08c86b | 1514 | return c; |
1515 | } | |
1516 | ||
0b242b12 | 1517 | /* XXXX move to generic input handler */ |
396c147e | 1518 | static void |
7819b5c3 | 1519 | client_input_channel_open(int type, u_int32_t seq, void *ctxt) |
0b242b12 | 1520 | { |
1521 | Channel *c = NULL; | |
1522 | char *ctype; | |
0b242b12 | 1523 | int rchan; |
f91d9a89 | 1524 | u_int rmaxpack, rwindow, len; |
0b242b12 | 1525 | |
1526 | ctype = packet_get_string(&len); | |
1527 | rchan = packet_get_int(); | |
1528 | rwindow = packet_get_int(); | |
1529 | rmaxpack = packet_get_int(); | |
1530 | ||
1d1ffb87 | 1531 | debug("client_input_channel_open: ctype %s rchan %d win %d max %d", |
0b242b12 | 1532 | ctype, rchan, rwindow, rmaxpack); |
1533 | ||
fa08c86b | 1534 | if (strcmp(ctype, "forwarded-tcpip") == 0) { |
1535 | c = client_request_forwarded_tcpip(ctype, rchan); | |
1536 | } else if (strcmp(ctype, "x11") == 0) { | |
1537 | c = client_request_x11(ctype, rchan); | |
1538 | } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) { | |
1539 | c = client_request_agent(ctype, rchan); | |
0b242b12 | 1540 | } |
1541 | /* XXX duplicate : */ | |
1542 | if (c != NULL) { | |
1543 | debug("confirm %s", ctype); | |
1544 | c->remote_id = rchan; | |
1545 | c->remote_window = rwindow; | |
1546 | c->remote_maxpacket = rmaxpack; | |
a01a10dd | 1547 | if (c->type != SSH_CHANNEL_CONNECTING) { |
1548 | packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1549 | packet_put_int(c->remote_id); | |
1550 | packet_put_int(c->self); | |
1551 | packet_put_int(c->local_window); | |
1552 | packet_put_int(c->local_maxpacket); | |
1553 | packet_send(); | |
1554 | } | |
0b242b12 | 1555 | } else { |
1556 | debug("failure %s", ctype); | |
1557 | packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); | |
1558 | packet_put_int(rchan); | |
1559 | packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED); | |
fbe90f7b | 1560 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { |
a01a10dd | 1561 | packet_put_cstring("open failed"); |
fbe90f7b | 1562 | packet_put_cstring(""); |
1563 | } | |
0b242b12 | 1564 | packet_send(); |
1565 | } | |
1566 | xfree(ctype); | |
1567 | } | |
396c147e | 1568 | static void |
7819b5c3 | 1569 | client_input_channel_req(int type, u_int32_t seq, void *ctxt) |
1fc8ccdf | 1570 | { |
1571 | Channel *c = NULL; | |
5e96b616 | 1572 | int exitval, id, reply, success = 0; |
1fc8ccdf | 1573 | char *rtype; |
1574 | ||
1575 | id = packet_get_int(); | |
1576 | rtype = packet_get_string(NULL); | |
1577 | reply = packet_get_char(); | |
1578 | ||
1579 | debug("client_input_channel_req: channel %d rtype %s reply %d", | |
1580 | id, rtype, reply); | |
1581 | ||
1fc8ccdf | 1582 | c = channel_lookup(id); |
1583 | if (c == NULL) { | |
1584 | error("client_input_channel_req: channel %d: unknown channel", id); | |
1585 | } else if (strcmp(rtype, "exit-status") == 0) { | |
5e96b616 | 1586 | exitval = packet_get_int(); |
1587 | if (id == session_ident) { | |
1588 | success = 1; | |
1589 | exit_status = exitval; | |
1590 | } else if (c->ctl_fd == -1) { | |
1591 | error("client_input_channel_req: unexpected channel %d", | |
1592 | session_ident); | |
1593 | } else { | |
1594 | atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval)); | |
1595 | success = 1; | |
1596 | } | |
95500969 | 1597 | packet_check_eom(); |
1fc8ccdf | 1598 | } |
1599 | if (reply) { | |
1600 | packet_start(success ? | |
1601 | SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE); | |
1602 | packet_put_int(c->remote_id); | |
1603 | packet_send(); | |
1604 | } | |
1605 | xfree(rtype); | |
1606 | } | |
3d209bbe | 1607 | static void |
1608 | client_input_global_request(int type, u_int32_t seq, void *ctxt) | |
1609 | { | |
1610 | char *rtype; | |
1611 | int want_reply; | |
1612 | int success = 0; | |
1613 | ||
1614 | rtype = packet_get_string(NULL); | |
1615 | want_reply = packet_get_char(); | |
5d8d32a3 | 1616 | debug("client_input_global_request: rtype %s want_reply %d", |
1617 | rtype, want_reply); | |
3d209bbe | 1618 | if (want_reply) { |
1619 | packet_start(success ? | |
1620 | SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE); | |
1621 | packet_send(); | |
1622 | packet_write_wait(); | |
1623 | } | |
1624 | xfree(rtype); | |
1625 | } | |
0b242b12 | 1626 | |
5e96b616 | 1627 | void |
1628 | client_session2_setup(int id, int want_tty, int want_subsystem, | |
1629 | const char *term, struct termios *tiop, int in_fd, Buffer *cmd, | |
1630 | dispatch_fn *subsys_repl) | |
1631 | { | |
1632 | int len; | |
1633 | ||
1634 | debug2("%s: id %d", __func__, id); | |
1635 | ||
1636 | if (want_tty) { | |
1637 | struct winsize ws; | |
1638 | struct termios tio; | |
1639 | ||
1640 | /* Store window size in the packet. */ | |
1641 | if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0) | |
1642 | memset(&ws, 0, sizeof(ws)); | |
1643 | ||
1644 | channel_request_start(id, "pty-req", 0); | |
1645 | packet_put_cstring(term != NULL ? term : ""); | |
1646 | packet_put_int(ws.ws_col); | |
1647 | packet_put_int(ws.ws_row); | |
1648 | packet_put_int(ws.ws_xpixel); | |
1649 | packet_put_int(ws.ws_ypixel); | |
1650 | tio = get_saved_tio(); | |
1651 | tty_make_modes(-1, tiop != NULL ? tiop : &tio); | |
1652 | packet_send(); | |
1653 | /* XXX wait for reply */ | |
1654 | } | |
1655 | ||
1656 | /* Transfer any environment variables from client to server */ | |
1657 | if (options.num_send_env != 0) { | |
1658 | int i, j, matched; | |
1659 | extern char **environ; | |
1660 | char *name, *val; | |
1661 | ||
1662 | debug("Sending environment."); | |
1663 | for (i = 0; environ && environ[i] != NULL; i++) { | |
1664 | /* Split */ | |
1665 | name = xstrdup(environ[i]); | |
1666 | if ((val = strchr(name, '=')) == NULL) { | |
1667 | free(name); | |
1668 | continue; | |
1669 | } | |
1670 | *val++ = '\0'; | |
1671 | ||
1672 | matched = 0; | |
1673 | for (j = 0; j < options.num_send_env; j++) { | |
1674 | if (match_pattern(name, options.send_env[j])) { | |
1675 | matched = 1; | |
1676 | break; | |
1677 | } | |
1678 | } | |
1679 | if (!matched) { | |
1680 | debug3("Ignored env %s", name); | |
1681 | free(name); | |
1682 | continue; | |
1683 | } | |
1684 | ||
1685 | debug("Sending env %s = %s", name, val); | |
1686 | channel_request_start(id, "env", 0); | |
1687 | packet_put_cstring(name); | |
1688 | packet_put_cstring(val); | |
1689 | packet_send(); | |
1690 | free(name); | |
1691 | } | |
1692 | } | |
1693 | ||
1694 | len = buffer_len(cmd); | |
1695 | if (len > 0) { | |
1696 | if (len > 900) | |
1697 | len = 900; | |
1698 | if (want_subsystem) { | |
1699 | debug("Sending subsystem: %.*s", len, (u_char*)buffer_ptr(cmd)); | |
1700 | channel_request_start(id, "subsystem", subsys_repl != NULL); | |
1701 | if (subsys_repl != NULL) { | |
1702 | /* register callback for reply */ | |
1703 | /* XXX we assume that client_loop has already been called */ | |
1704 | dispatch_set(SSH2_MSG_CHANNEL_FAILURE, subsys_repl); | |
1705 | dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, subsys_repl); | |
1706 | } | |
1707 | } else { | |
1708 | debug("Sending command: %.*s", len, (u_char*)buffer_ptr(cmd)); | |
1709 | channel_request_start(id, "exec", 0); | |
1710 | } | |
1711 | packet_put_string(buffer_ptr(cmd), buffer_len(cmd)); | |
1712 | packet_send(); | |
1713 | } else { | |
1714 | channel_request_start(id, "shell", 0); | |
1715 | packet_send(); | |
1716 | } | |
1717 | } | |
1718 | ||
396c147e | 1719 | static void |
5ca51e19 | 1720 | client_init_dispatch_20(void) |
8ce64345 | 1721 | { |
7a37c112 | 1722 | dispatch_init(&dispatch_protocol_error); |
e0ae8728 | 1723 | |
8ce64345 | 1724 | dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose); |
1725 | dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data); | |
1726 | dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof); | |
1727 | dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data); | |
0b242b12 | 1728 | dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open); |
8ce64345 | 1729 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); |
1730 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); | |
1fc8ccdf | 1731 | dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req); |
8ce64345 | 1732 | dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust); |
3d209bbe | 1733 | dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request); |
7a37c112 | 1734 | |
1735 | /* rekeying */ | |
1736 | dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit); | |
e0ae8728 | 1737 | |
1738 | /* global request reply messages */ | |
1739 | dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply); | |
1740 | dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply); | |
8ce64345 | 1741 | } |
396c147e | 1742 | static void |
5ca51e19 | 1743 | client_init_dispatch_13(void) |
7368a6c8 | 1744 | { |
1745 | dispatch_init(NULL); | |
1746 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close); | |
1747 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation); | |
1748 | dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data); | |
7368a6c8 | 1749 | dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); |
1750 | dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); | |
1751 | dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open); | |
7368a6c8 | 1752 | dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status); |
1753 | dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data); | |
1754 | dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data); | |
a22aff1f | 1755 | |
1756 | dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ? | |
c15706e2 | 1757 | &client_input_agent_open : &deny_input_open); |
a22aff1f | 1758 | dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ? |
1759 | &x11_input_open : &deny_input_open); | |
7368a6c8 | 1760 | } |
396c147e | 1761 | static void |
5ca51e19 | 1762 | client_init_dispatch_15(void) |
7368a6c8 | 1763 | { |
1764 | client_init_dispatch_13(); | |
1765 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof); | |
1766 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose); | |
1767 | } | |
eea46d13 | 1768 | static void |
5ca51e19 | 1769 | client_init_dispatch(void) |
7368a6c8 | 1770 | { |
8ce64345 | 1771 | if (compat20) |
1772 | client_init_dispatch_20(); | |
1773 | else if (compat13) | |
7368a6c8 | 1774 | client_init_dispatch_13(); |
1775 | else | |
1776 | client_init_dispatch_15(); | |
1777 | } | |
82de775c | 1778 | |
1779 | /* client specific fatal cleanup */ | |
1780 | void | |
2362db19 | 1781 | cleanup_exit(int i) |
82de775c | 1782 | { |
82de775c | 1783 | leave_raw_mode(); |
1784 | leave_non_blocking(); | |
5e96b616 | 1785 | if (options.control_path != NULL && control_fd != -1) |
1786 | unlink(options.control_path); | |
2362db19 | 1787 | _exit(i); |
82de775c | 1788 | } |