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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" | |
f8cc7664 | 62 | RCSID("$OpenBSD: clientloop.c,v 1.136 2005/03/10 22:01:05 deraadt 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; | |
1786be35 | 146 | char **env; |
5e96b616 | 147 | }; |
148 | ||
e092ce67 | 149 | /*XXX*/ |
150 | extern Kex *xxx_kex; | |
151 | ||
5e96b616 | 152 | void ssh_process_session2_setup(int, int, int, Buffer *); |
153 | ||
8efc0c15 | 154 | /* Restores stdin to blocking mode. */ |
155 | ||
396c147e | 156 | static void |
5ca51e19 | 157 | leave_non_blocking(void) |
8efc0c15 | 158 | { |
5260325f | 159 | if (in_non_blocking_mode) { |
1b273ece | 160 | unset_nonblock(fileno(stdin)); |
5260325f | 161 | in_non_blocking_mode = 0; |
5260325f | 162 | } |
8efc0c15 | 163 | } |
164 | ||
5260325f | 165 | /* Puts stdin terminal in non-blocking mode. */ |
166 | ||
396c147e | 167 | static void |
5ca51e19 | 168 | enter_non_blocking(void) |
8efc0c15 | 169 | { |
5260325f | 170 | in_non_blocking_mode = 1; |
170694d7 | 171 | set_nonblock(fileno(stdin)); |
8efc0c15 | 172 | } |
173 | ||
aa3378df | 174 | /* |
175 | * Signal handler for the window change signal (SIGWINCH). This just sets a | |
176 | * flag indicating that the window has changed. | |
177 | */ | |
8efc0c15 | 178 | |
396c147e | 179 | static void |
5260325f | 180 | window_change_handler(int sig) |
8efc0c15 | 181 | { |
5260325f | 182 | received_window_change_signal = 1; |
183 | signal(SIGWINCH, window_change_handler); | |
8efc0c15 | 184 | } |
185 | ||
aa3378df | 186 | /* |
187 | * Signal handler for signals that cause the program to terminate. These | |
188 | * signals must be trapped to restore terminal modes. | |
189 | */ | |
8efc0c15 | 190 | |
396c147e | 191 | static void |
5260325f | 192 | signal_handler(int sig) |
8efc0c15 | 193 | { |
c9130033 | 194 | received_signal = sig; |
195 | quit_pending = 1; | |
8efc0c15 | 196 | } |
197 | ||
aa3378df | 198 | /* |
199 | * Returns current time in seconds from Jan 1, 1970 with the maximum | |
200 | * available resolution. | |
201 | */ | |
8efc0c15 | 202 | |
396c147e | 203 | static double |
5ca51e19 | 204 | get_current_time(void) |
8efc0c15 | 205 | { |
5260325f | 206 | struct timeval tv; |
207 | gettimeofday(&tv, NULL); | |
208 | return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0; | |
8efc0c15 | 209 | } |
210 | ||
aa3378df | 211 | /* |
212 | * This is called when the interactive is entered. This checks if there is | |
213 | * an EOF coming on stdin. We must check this explicitly, as select() does | |
214 | * not appear to wake up when redirecting from /dev/null. | |
215 | */ | |
8efc0c15 | 216 | |
396c147e | 217 | static void |
5ca51e19 | 218 | client_check_initial_eof_on_stdin(void) |
8efc0c15 | 219 | { |
5260325f | 220 | int len; |
221 | char buf[1]; | |
222 | ||
aa3378df | 223 | /* |
224 | * If standard input is to be "redirected from /dev/null", we simply | |
225 | * mark that we have seen an EOF and send an EOF message to the | |
226 | * server. Otherwise, we try to read a single character; it appears | |
227 | * that for some files, such /dev/null, select() never wakes up for | |
228 | * read for this descriptor, which means that we never get EOF. This | |
229 | * way we will get the EOF if stdin comes from /dev/null or similar. | |
230 | */ | |
5260325f | 231 | if (stdin_null_flag) { |
232 | /* Fake EOF on stdin. */ | |
233 | debug("Sending eof."); | |
234 | stdin_eof = 1; | |
235 | packet_start(SSH_CMSG_EOF); | |
236 | packet_send(); | |
237 | } else { | |
5260325f | 238 | enter_non_blocking(); |
239 | ||
240 | /* Check for immediate EOF on stdin. */ | |
241 | len = read(fileno(stdin), buf, 1); | |
242 | if (len == 0) { | |
aa3378df | 243 | /* EOF. Record that we have seen it and send EOF to server. */ |
5260325f | 244 | debug("Sending eof."); |
245 | stdin_eof = 1; | |
246 | packet_start(SSH_CMSG_EOF); | |
247 | packet_send(); | |
248 | } else if (len > 0) { | |
aa3378df | 249 | /* |
250 | * Got data. We must store the data in the buffer, | |
251 | * and also process it as an escape character if | |
252 | * appropriate. | |
253 | */ | |
1e3b8b07 | 254 | if ((u_char) buf[0] == escape_char) |
5260325f | 255 | escape_pending = 1; |
7e8911cd | 256 | else |
5260325f | 257 | buffer_append(&stdin_buffer, buf, 1); |
5260325f | 258 | } |
5260325f | 259 | leave_non_blocking(); |
8efc0c15 | 260 | } |
8efc0c15 | 261 | } |
262 | ||
8efc0c15 | 263 | |
aa3378df | 264 | /* |
265 | * Make packets from buffered stdin data, and buffer them for sending to the | |
266 | * connection. | |
267 | */ | |
8efc0c15 | 268 | |
396c147e | 269 | static void |
5ca51e19 | 270 | client_make_packets_from_stdin_data(void) |
8efc0c15 | 271 | { |
1e3b8b07 | 272 | u_int len; |
5260325f | 273 | |
274 | /* Send buffered stdin data to the server. */ | |
275 | while (buffer_len(&stdin_buffer) > 0 && | |
184eed6a | 276 | packet_not_very_much_data_to_write()) { |
5260325f | 277 | len = buffer_len(&stdin_buffer); |
278 | /* Keep the packets at reasonable size. */ | |
279 | if (len > packet_get_maxsize()) | |
280 | len = packet_get_maxsize(); | |
281 | packet_start(SSH_CMSG_STDIN_DATA); | |
282 | packet_put_string(buffer_ptr(&stdin_buffer), len); | |
283 | packet_send(); | |
284 | buffer_consume(&stdin_buffer, len); | |
7e8911cd | 285 | stdin_bytes += len; |
5260325f | 286 | /* If we have a pending EOF, send it now. */ |
287 | if (stdin_eof && buffer_len(&stdin_buffer) == 0) { | |
288 | packet_start(SSH_CMSG_EOF); | |
289 | packet_send(); | |
290 | } | |
8efc0c15 | 291 | } |
8efc0c15 | 292 | } |
293 | ||
aa3378df | 294 | /* |
295 | * Checks if the client window has changed, and sends a packet about it to | |
296 | * the server if so. The actual change is detected elsewhere (by a software | |
297 | * interrupt on Unix); this just checks the flag and sends a message if | |
298 | * appropriate. | |
299 | */ | |
8efc0c15 | 300 | |
396c147e | 301 | static void |
5ca51e19 | 302 | client_check_window_change(void) |
8efc0c15 | 303 | { |
8ce64345 | 304 | struct winsize ws; |
305 | ||
306 | if (! received_window_change_signal) | |
307 | return; | |
308 | /** XXX race */ | |
309 | received_window_change_signal = 0; | |
310 | ||
de273eef | 311 | debug2("client_check_window_change: changed"); |
8ce64345 | 312 | |
313 | if (compat20) { | |
5e96b616 | 314 | channel_send_window_changes(); |
8ce64345 | 315 | } else { |
5e96b616 | 316 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) |
317 | return; | |
8ce64345 | 318 | packet_start(SSH_CMSG_WINDOW_SIZE); |
319 | packet_put_int(ws.ws_row); | |
320 | packet_put_int(ws.ws_col); | |
321 | packet_put_int(ws.ws_xpixel); | |
322 | packet_put_int(ws.ws_ypixel); | |
323 | packet_send(); | |
8efc0c15 | 324 | } |
8efc0c15 | 325 | } |
326 | ||
5d8d32a3 | 327 | static void |
328 | client_global_request_reply(int type, u_int32_t seq, void *ctxt) | |
329 | { | |
330 | server_alive_timeouts = 0; | |
331 | client_global_request_reply_fwd(type, seq, ctxt); | |
332 | } | |
333 | ||
334 | static void | |
335 | server_alive_check(void) | |
336 | { | |
337 | if (++server_alive_timeouts > options.server_alive_count_max) | |
338 | packet_disconnect("Timeout, server not responding."); | |
339 | packet_start(SSH2_MSG_GLOBAL_REQUEST); | |
340 | packet_put_cstring("keepalive@openssh.com"); | |
341 | packet_put_char(1); /* boolean: want reply */ | |
342 | packet_send(); | |
343 | } | |
344 | ||
aa3378df | 345 | /* |
346 | * Waits until the client can do something (some data becomes available on | |
347 | * one of the file descriptors). | |
348 | */ | |
396c147e | 349 | static void |
39929cdb | 350 | client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp, |
9a995072 | 351 | int *maxfdp, u_int *nallocp, int rekeying) |
8efc0c15 | 352 | { |
5d8d32a3 | 353 | struct timeval tv, *tvp; |
354 | int ret; | |
355 | ||
39929cdb | 356 | /* Add any selections by the channel mechanism. */ |
489aa2e9 | 357 | channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying); |
5260325f | 358 | |
8ce64345 | 359 | if (!compat20) { |
360 | /* Read from the connection, unless our buffers are full. */ | |
361 | if (buffer_len(&stdout_buffer) < buffer_high && | |
362 | buffer_len(&stderr_buffer) < buffer_high && | |
363 | channel_not_very_much_buffered_data()) | |
39929cdb | 364 | FD_SET(connection_in, *readsetp); |
8ce64345 | 365 | /* |
366 | * Read from stdin, unless we have seen EOF or have very much | |
367 | * buffered data to send to the server. | |
368 | */ | |
369 | if (!stdin_eof && packet_not_very_much_data_to_write()) | |
39929cdb | 370 | FD_SET(fileno(stdin), *readsetp); |
8ce64345 | 371 | |
372 | /* Select stdout/stderr if have data in buffer. */ | |
373 | if (buffer_len(&stdout_buffer) > 0) | |
39929cdb | 374 | FD_SET(fileno(stdout), *writesetp); |
8ce64345 | 375 | if (buffer_len(&stderr_buffer) > 0) |
39929cdb | 376 | FD_SET(fileno(stderr), *writesetp); |
8ce64345 | 377 | } else { |
24b6b45f | 378 | /* channel_prepare_select could have closed the last channel */ |
fd6cfbaf | 379 | if (session_closed && !channel_still_open() && |
380 | !packet_have_data_to_write()) { | |
381 | /* clear mask since we did not call select() */ | |
b3ad8fe6 | 382 | memset(*readsetp, 0, *nallocp); |
383 | memset(*writesetp, 0, *nallocp); | |
fd6cfbaf | 384 | return; |
24b6b45f | 385 | } else { |
386 | FD_SET(connection_in, *readsetp); | |
387 | } | |
8ce64345 | 388 | } |
5260325f | 389 | |
5260325f | 390 | /* Select server connection if have data to write to the server. */ |
391 | if (packet_have_data_to_write()) | |
39929cdb | 392 | FD_SET(connection_out, *writesetp); |
5260325f | 393 | |
5e96b616 | 394 | if (control_fd != -1) |
395 | FD_SET(control_fd, *readsetp); | |
396 | ||
aa3378df | 397 | /* |
398 | * Wait for something to happen. This will suspend the process until | |
399 | * some selected descriptor can be read, written, or has some other | |
5d8d32a3 | 400 | * event pending. |
aa3378df | 401 | */ |
5260325f | 402 | |
5d8d32a3 | 403 | if (options.server_alive_interval == 0 || !compat20) |
404 | tvp = NULL; | |
f2107e97 | 405 | else { |
5d8d32a3 | 406 | tv.tv_sec = options.server_alive_interval; |
407 | tv.tv_usec = 0; | |
408 | tvp = &tv; | |
409 | } | |
410 | ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp); | |
411 | if (ret < 0) { | |
5260325f | 412 | char buf[100]; |
fd193ca4 | 413 | |
414 | /* | |
415 | * We have to clear the select masks, because we return. | |
416 | * We have to return, because the mainloop checks for the flags | |
417 | * set by the signal handlers. | |
418 | */ | |
b3ad8fe6 | 419 | memset(*readsetp, 0, *nallocp); |
420 | memset(*writesetp, 0, *nallocp); | |
fd193ca4 | 421 | |
5260325f | 422 | if (errno == EINTR) |
423 | return; | |
424 | /* Note: we might still have data in the buffers. */ | |
425 | snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno)); | |
426 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
5260325f | 427 | quit_pending = 1; |
5d8d32a3 | 428 | } else if (ret == 0) |
429 | server_alive_check(); | |
8efc0c15 | 430 | } |
431 | ||
396c147e | 432 | static void |
2e73a022 | 433 | client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr) |
8efc0c15 | 434 | { |
5260325f | 435 | /* Flush stdout and stderr buffers. */ |
2e73a022 | 436 | if (buffer_len(bout) > 0) |
dc54438a | 437 | atomicio(vwrite, fileno(stdout), buffer_ptr(bout), buffer_len(bout)); |
2e73a022 | 438 | if (buffer_len(berr) > 0) |
dc54438a | 439 | atomicio(vwrite, fileno(stderr), buffer_ptr(berr), buffer_len(berr)); |
5260325f | 440 | |
5260325f | 441 | leave_raw_mode(); |
442 | ||
aa3378df | 443 | /* |
444 | * Free (and clear) the buffer to reduce the amount of data that gets | |
445 | * written to swap. | |
446 | */ | |
2e73a022 | 447 | buffer_free(bin); |
448 | buffer_free(bout); | |
449 | buffer_free(berr); | |
5260325f | 450 | |
5260325f | 451 | /* Send the suspend signal to the program itself. */ |
452 | kill(getpid(), SIGTSTP); | |
453 | ||
2c9a4d41 | 454 | /* Reset window sizes in case they have changed */ |
455 | received_window_change_signal = 1; | |
5260325f | 456 | |
457 | /* OK, we have been continued by the user. Reinitialize buffers. */ | |
2e73a022 | 458 | buffer_init(bin); |
459 | buffer_init(bout); | |
460 | buffer_init(berr); | |
5260325f | 461 | |
5260325f | 462 | enter_raw_mode(); |
8efc0c15 | 463 | } |
464 | ||
396c147e | 465 | static void |
8ce64345 | 466 | client_process_net_input(fd_set * readset) |
8efc0c15 | 467 | { |
8ce64345 | 468 | int len; |
469 | char buf[8192]; | |
5260325f | 470 | |
aa3378df | 471 | /* |
472 | * Read input from the server, and add any such data to the buffer of | |
473 | * the packet subsystem. | |
474 | */ | |
5260325f | 475 | if (FD_ISSET(connection_in, readset)) { |
476 | /* Read as much as possible. */ | |
477 | len = read(connection_in, buf, sizeof(buf)); | |
478 | if (len == 0) { | |
479 | /* Received EOF. The remote host has closed the connection. */ | |
480 | snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n", | |
481 | host); | |
8efc0c15 | 482 | buffer_append(&stderr_buffer, buf, strlen(buf)); |
8efc0c15 | 483 | quit_pending = 1; |
484 | return; | |
5260325f | 485 | } |
aa3378df | 486 | /* |
487 | * There is a kernel bug on Solaris that causes select to | |
488 | * sometimes wake up even though there is no data available. | |
489 | */ | |
09cb311c | 490 | if (len < 0 && (errno == EAGAIN || errno == EINTR)) |
5260325f | 491 | len = 0; |
492 | ||
493 | if (len < 0) { | |
494 | /* An error has encountered. Perhaps there is a network problem. */ | |
495 | snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n", | |
496 | host, strerror(errno)); | |
497 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
5260325f | 498 | quit_pending = 1; |
499 | return; | |
500 | } | |
501 | packet_process_incoming(buf, len); | |
502 | } | |
8ce64345 | 503 | } |
504 | ||
5e96b616 | 505 | static void |
506 | client_subsystem_reply(int type, u_int32_t seq, void *ctxt) | |
507 | { | |
508 | int id; | |
509 | Channel *c; | |
f2107e97 | 510 | |
5e96b616 | 511 | id = packet_get_int(); |
512 | packet_check_eom(); | |
513 | ||
514 | if ((c = channel_lookup(id)) == NULL) { | |
515 | error("%s: no channel for id %d", __func__, id); | |
516 | return; | |
517 | } | |
518 | ||
519 | if (type == SSH2_MSG_CHANNEL_SUCCESS) | |
520 | debug2("Request suceeded on channel %d", id); | |
521 | else if (type == SSH2_MSG_CHANNEL_FAILURE) { | |
522 | error("Request failed on channel %d", id); | |
523 | channel_free(c); | |
524 | } | |
525 | } | |
526 | ||
527 | static void | |
528 | client_extra_session2_setup(int id, void *arg) | |
529 | { | |
530 | struct confirm_ctx *cctx = arg; | |
531 | Channel *c; | |
1786be35 | 532 | int i; |
f2107e97 | 533 | |
5e96b616 | 534 | if (cctx == NULL) |
535 | fatal("%s: cctx == NULL", __func__); | |
536 | if ((c = channel_lookup(id)) == NULL) | |
537 | fatal("%s: no channel for id %d", __func__, id); | |
538 | ||
f2107e97 | 539 | client_session2_setup(id, cctx->want_tty, cctx->want_subsys, |
1786be35 | 540 | cctx->term, &cctx->tio, c->rfd, &cctx->cmd, cctx->env, |
5e96b616 | 541 | client_subsystem_reply); |
0d34d6ce | 542 | |
5e96b616 | 543 | c->confirm_ctx = NULL; |
544 | buffer_free(&cctx->cmd); | |
1786be35 | 545 | xfree(cctx->term); |
546 | if (cctx->env != NULL) { | |
547 | for (i = 0; cctx->env[i] != NULL; i++) | |
548 | xfree(cctx->env[i]); | |
549 | xfree(cctx->env); | |
f2107e97 | 550 | } |
1786be35 | 551 | xfree(cctx); |
5e96b616 | 552 | } |
553 | ||
554 | static void | |
555 | client_process_control(fd_set * readset) | |
556 | { | |
557 | Buffer m; | |
558 | Channel *c; | |
0d34d6ce | 559 | int client_fd, new_fd[3], ver, i, allowed; |
5e96b616 | 560 | socklen_t addrlen; |
561 | struct sockaddr_storage addr; | |
562 | struct confirm_ctx *cctx; | |
563 | char *cmd; | |
f8c6db83 | 564 | u_int len, env_len, command, flags; |
5e96b616 | 565 | uid_t euid; |
566 | gid_t egid; | |
567 | ||
568 | /* | |
569 | * Accept connection on control socket | |
570 | */ | |
571 | if (control_fd == -1 || !FD_ISSET(control_fd, readset)) | |
572 | return; | |
573 | ||
574 | memset(&addr, 0, sizeof(addr)); | |
575 | addrlen = sizeof(addr); | |
576 | if ((client_fd = accept(control_fd, | |
577 | (struct sockaddr*)&addr, &addrlen)) == -1) { | |
578 | error("%s accept: %s", __func__, strerror(errno)); | |
579 | return; | |
580 | } | |
581 | ||
582 | if (getpeereid(client_fd, &euid, &egid) < 0) { | |
583 | error("%s getpeereid failed: %s", __func__, strerror(errno)); | |
584 | close(client_fd); | |
585 | return; | |
586 | } | |
587 | if ((euid != 0) && (getuid() != euid)) { | |
588 | error("control mode uid mismatch: peer euid %u != uid %u", | |
589 | (u_int) euid, (u_int) getuid()); | |
590 | close(client_fd); | |
591 | return; | |
592 | } | |
0d34d6ce | 593 | |
5e96b616 | 594 | unset_nonblock(client_fd); |
595 | ||
f8c6db83 | 596 | /* Read command */ |
5e96b616 | 597 | buffer_init(&m); |
f8c6db83 | 598 | if (ssh_msg_recv(client_fd, &m) == -1) { |
599 | error("%s: client msg_recv failed", __func__); | |
600 | close(client_fd); | |
601 | buffer_free(&m); | |
602 | return; | |
603 | } | |
604 | if ((ver = buffer_get_char(&m)) != 1) { | |
605 | error("%s: wrong client version %d", __func__, ver); | |
606 | buffer_free(&m); | |
607 | close(client_fd); | |
608 | return; | |
609 | } | |
610 | ||
611 | allowed = 1; | |
612 | command = buffer_get_int(&m); | |
613 | flags = buffer_get_int(&m); | |
614 | ||
615 | buffer_clear(&m); | |
5e96b616 | 616 | |
f8c6db83 | 617 | switch (command) { |
618 | case SSHMUX_COMMAND_OPEN: | |
619 | if (options.control_master == 2) | |
620 | allowed = ask_permission("Allow shared connection " | |
621 | "to %s? ", host); | |
622 | /* continue below */ | |
623 | break; | |
624 | case SSHMUX_COMMAND_TERMINATE: | |
625 | if (options.control_master == 2) | |
626 | allowed = ask_permission("Terminate shared connection " | |
627 | "to %s? ", host); | |
628 | if (allowed) | |
629 | quit_pending = 1; | |
f8cc7664 | 630 | /* FALLTHROUGH */ |
f8c6db83 | 631 | case SSHMUX_COMMAND_ALIVE_CHECK: |
632 | /* Reply for SSHMUX_COMMAND_TERMINATE and ALIVE_CHECK */ | |
633 | buffer_clear(&m); | |
634 | buffer_put_int(&m, allowed); | |
635 | buffer_put_int(&m, getpid()); | |
636 | if (ssh_msg_send(client_fd, /* version */1, &m) == -1) { | |
637 | error("%s: client msg_send failed", __func__); | |
638 | close(client_fd); | |
639 | buffer_free(&m); | |
640 | return; | |
641 | } | |
642 | buffer_free(&m); | |
643 | close(client_fd); | |
644 | return; | |
645 | default: | |
646 | error("Unsupported command %d", command); | |
647 | buffer_free(&m); | |
648 | close(client_fd); | |
649 | return; | |
650 | } | |
651 | ||
652 | /* Reply for SSHMUX_COMMAND_OPEN */ | |
653 | buffer_clear(&m); | |
0d34d6ce | 654 | buffer_put_int(&m, allowed); |
5e96b616 | 655 | buffer_put_int(&m, getpid()); |
f8c6db83 | 656 | if (ssh_msg_send(client_fd, /* version */1, &m) == -1) { |
5e96b616 | 657 | error("%s: client msg_send failed", __func__); |
658 | close(client_fd); | |
0d34d6ce | 659 | buffer_free(&m); |
5e96b616 | 660 | return; |
661 | } | |
5e96b616 | 662 | |
0d34d6ce | 663 | if (!allowed) { |
664 | error("Refused control connection"); | |
665 | close(client_fd); | |
666 | buffer_free(&m); | |
667 | return; | |
668 | } | |
669 | ||
f8c6db83 | 670 | buffer_clear(&m); |
5e96b616 | 671 | if (ssh_msg_recv(client_fd, &m) == -1) { |
672 | error("%s: client msg_recv failed", __func__); | |
673 | close(client_fd); | |
0d34d6ce | 674 | buffer_free(&m); |
5e96b616 | 675 | return; |
676 | } | |
f8c6db83 | 677 | if ((ver = buffer_get_char(&m)) != 1) { |
5e96b616 | 678 | error("%s: wrong client version %d", __func__, ver); |
679 | buffer_free(&m); | |
680 | close(client_fd); | |
681 | return; | |
682 | } | |
683 | ||
684 | cctx = xmalloc(sizeof(*cctx)); | |
685 | memset(cctx, 0, sizeof(*cctx)); | |
f8c6db83 | 686 | cctx->want_tty = (flags & SSHMUX_FLAG_TTY) != 0; |
687 | cctx->want_subsys = (flags & SSHMUX_FLAG_SUBSYS) != 0; | |
5e96b616 | 688 | cctx->term = buffer_get_string(&m, &len); |
689 | ||
690 | cmd = buffer_get_string(&m, &len); | |
691 | buffer_init(&cctx->cmd); | |
692 | buffer_append(&cctx->cmd, cmd, strlen(cmd)); | |
693 | ||
1786be35 | 694 | env_len = buffer_get_int(&m); |
695 | env_len = MIN(env_len, 4096); | |
696 | debug3("%s: receiving %d env vars", __func__, env_len); | |
697 | if (env_len != 0) { | |
698 | cctx->env = xmalloc(sizeof(*cctx->env) * (env_len + 1)); | |
699 | for (i = 0; i < env_len; i++) | |
700 | cctx->env[i] = buffer_get_string(&m, &len); | |
701 | cctx->env[i] = NULL; | |
702 | } | |
703 | ||
5e96b616 | 704 | debug2("%s: accepted tty %d, subsys %d, cmd %s", __func__, |
705 | cctx->want_tty, cctx->want_subsys, cmd); | |
706 | ||
707 | /* Gather fds from client */ | |
708 | new_fd[0] = mm_receive_fd(client_fd); | |
709 | new_fd[1] = mm_receive_fd(client_fd); | |
710 | new_fd[2] = mm_receive_fd(client_fd); | |
711 | ||
712 | debug2("%s: got fds stdin %d, stdout %d, stderr %d", __func__, | |
713 | new_fd[0], new_fd[1], new_fd[2]); | |
714 | ||
715 | /* Try to pick up ttymodes from client before it goes raw */ | |
716 | if (cctx->want_tty && tcgetattr(new_fd[0], &cctx->tio) == -1) | |
717 | error("%s: tcgetattr: %s", __func__, strerror(errno)); | |
718 | ||
f8c6db83 | 719 | /* This roundtrip is just for synchronisation of ttymodes */ |
5e96b616 | 720 | buffer_clear(&m); |
f8c6db83 | 721 | if (ssh_msg_send(client_fd, /* version */1, &m) == -1) { |
5e96b616 | 722 | error("%s: client msg_send failed", __func__); |
723 | close(client_fd); | |
724 | close(new_fd[0]); | |
725 | close(new_fd[1]); | |
726 | close(new_fd[2]); | |
0d34d6ce | 727 | buffer_free(&m); |
f8c6db83 | 728 | xfree(cctx->term); |
729 | if (env_len != 0) { | |
730 | for (i = 0; i < env_len; i++) | |
731 | xfree(cctx->env[i]); | |
732 | xfree(cctx->env); | |
733 | } | |
5e96b616 | 734 | return; |
735 | } | |
736 | buffer_free(&m); | |
737 | ||
738 | /* enable nonblocking unless tty */ | |
739 | if (!isatty(new_fd[0])) | |
740 | set_nonblock(new_fd[0]); | |
741 | if (!isatty(new_fd[1])) | |
742 | set_nonblock(new_fd[1]); | |
743 | if (!isatty(new_fd[2])) | |
744 | set_nonblock(new_fd[2]); | |
745 | ||
746 | set_nonblock(client_fd); | |
747 | ||
f2107e97 | 748 | c = channel_new("session", SSH_CHANNEL_OPENING, |
5e96b616 | 749 | new_fd[0], new_fd[1], new_fd[2], |
750 | CHAN_SES_WINDOW_DEFAULT, CHAN_SES_PACKET_DEFAULT, | |
751 | CHAN_EXTENDED_WRITE, "client-session", /*nonblock*/0); | |
752 | ||
753 | /* XXX */ | |
754 | c->ctl_fd = client_fd; | |
755 | ||
756 | debug3("%s: channel_new: %d", __func__, c->self); | |
757 | ||
758 | channel_send_open(c->self); | |
759 | channel_register_confirm(c->self, client_extra_session2_setup, cctx); | |
760 | } | |
761 | ||
c53c54c2 | 762 | static void |
ec9b7086 | 763 | process_cmdline(void) |
c53c54c2 | 764 | { |
c53c54c2 | 765 | void (*handler)(int); |
3867aa0a | 766 | char *s, *cmd, *cancel_host; |
d740ec16 | 767 | int delete = 0; |
c53c54c2 | 768 | int local = 0; |
3867aa0a | 769 | u_short cancel_port; |
770 | Forward fwd; | |
c53c54c2 | 771 | |
772 | leave_raw_mode(); | |
875ec275 | 773 | handler = signal(SIGINT, SIG_IGN); |
ec9b7086 | 774 | cmd = s = read_passphrase("\r\nssh> ", RP_ECHO); |
c53c54c2 | 775 | if (s == NULL) |
776 | goto out; | |
c53c54c2 | 777 | while (*s && isspace(*s)) |
778 | s++; | |
d740ec16 | 779 | if (*s == '-') |
780 | s++; /* Skip cmdline '-', if any */ | |
27c6fcae | 781 | if (*s == '\0') |
c53c54c2 | 782 | goto out; |
d740ec16 | 783 | |
7069a5e2 | 784 | if (*s == 'h' || *s == 'H' || *s == '?') { |
d740ec16 | 785 | logit("Commands:"); |
786 | logit(" -Lport:host:hostport Request local forward"); | |
787 | logit(" -Rport:host:hostport Request remote forward"); | |
788 | logit(" -KRhostport Cancel remote forward"); | |
789 | goto out; | |
790 | } | |
791 | ||
792 | if (*s == 'K') { | |
793 | delete = 1; | |
794 | s++; | |
795 | } | |
796 | if (*s != 'L' && *s != 'R') { | |
bbe88b6d | 797 | logit("Invalid command."); |
c53c54c2 | 798 | goto out; |
799 | } | |
d740ec16 | 800 | if (*s == 'L') |
c53c54c2 | 801 | local = 1; |
d740ec16 | 802 | if (local && delete) { |
803 | logit("Not supported."); | |
804 | goto out; | |
805 | } | |
806 | if ((!local || delete) && !compat20) { | |
bbe88b6d | 807 | logit("Not supported for SSH protocol version 1."); |
c53c54c2 | 808 | goto out; |
809 | } | |
d740ec16 | 810 | |
811 | s++; | |
c53c54c2 | 812 | while (*s && isspace(*s)) |
813 | s++; | |
814 | ||
d740ec16 | 815 | if (delete) { |
3867aa0a | 816 | cancel_port = 0; |
817 | cancel_host = hpdelim(&s); /* may be NULL */ | |
818 | if (s != NULL) { | |
819 | cancel_port = a2port(s); | |
820 | cancel_host = cleanhostname(cancel_host); | |
821 | } else { | |
822 | cancel_port = a2port(cancel_host); | |
823 | cancel_host = NULL; | |
d740ec16 | 824 | } |
3867aa0a | 825 | if (cancel_port == 0) { |
826 | logit("Bad forwarding close port"); | |
c53c54c2 | 827 | goto out; |
828 | } | |
3867aa0a | 829 | channel_request_rforward_cancel(cancel_host, cancel_port); |
d740ec16 | 830 | } else { |
3867aa0a | 831 | if (!parse_forward(&fwd, s)) { |
d740ec16 | 832 | logit("Bad forwarding specification."); |
833 | goto out; | |
834 | } | |
d740ec16 | 835 | if (local) { |
3867aa0a | 836 | if (channel_setup_local_fwd_listener(fwd.listen_host, |
837 | fwd.listen_port, fwd.connect_host, | |
838 | fwd.connect_port, options.gateway_ports) < 0) { | |
d740ec16 | 839 | logit("Port forwarding failed."); |
840 | goto out; | |
841 | } | |
3867aa0a | 842 | } else { |
843 | channel_request_remote_forwarding(fwd.listen_host, | |
844 | fwd.listen_port, fwd.connect_host, | |
845 | fwd.connect_port); | |
846 | } | |
847 | ||
d740ec16 | 848 | logit("Forwarding port."); |
849 | } | |
850 | ||
c53c54c2 | 851 | out: |
852 | signal(SIGINT, handler); | |
853 | enter_raw_mode(); | |
854 | if (cmd) | |
855 | xfree(cmd); | |
856 | } | |
857 | ||
2e73a022 | 858 | /* process the characters one by one */ |
396c147e | 859 | static int |
2e73a022 | 860 | process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len) |
861 | { | |
862 | char string[1024]; | |
863 | pid_t pid; | |
864 | int bytes = 0; | |
1e3b8b07 | 865 | u_int i; |
866 | u_char ch; | |
2e73a022 | 867 | char *s; |
868 | ||
869 | for (i = 0; i < len; i++) { | |
870 | /* Get one character at a time. */ | |
871 | ch = buf[i]; | |
872 | ||
873 | if (escape_pending) { | |
874 | /* We have previously seen an escape character. */ | |
875 | /* Clear the flag now. */ | |
876 | escape_pending = 0; | |
877 | ||
878 | /* Process the escaped character. */ | |
879 | switch (ch) { | |
880 | case '.': | |
881 | /* Terminate the connection. */ | |
882 | snprintf(string, sizeof string, "%c.\r\n", escape_char); | |
883 | buffer_append(berr, string, strlen(string)); | |
2e73a022 | 884 | |
885 | quit_pending = 1; | |
886 | return -1; | |
887 | ||
888 | case 'Z' - 64: | |
889 | /* Suspend the program. */ | |
890 | /* Print a message to that effect to the user. */ | |
891 | snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char); | |
892 | buffer_append(berr, string, strlen(string)); | |
2e73a022 | 893 | |
894 | /* Restore terminal modes and suspend. */ | |
895 | client_suspend_self(bin, bout, berr); | |
896 | ||
897 | /* We have been continued. */ | |
898 | continue; | |
899 | ||
16a79097 | 900 | case 'B': |
901 | if (compat20) { | |
902 | snprintf(string, sizeof string, | |
903 | "%cB\r\n", escape_char); | |
904 | buffer_append(berr, string, | |
905 | strlen(string)); | |
906 | channel_request_start(session_ident, | |
907 | "break", 0); | |
908 | packet_put_int(1000); | |
909 | packet_send(); | |
910 | } | |
911 | continue; | |
912 | ||
e092ce67 | 913 | case 'R': |
54506d2e | 914 | if (compat20) { |
915 | if (datafellows & SSH_BUG_NOREKEY) | |
bbe88b6d | 916 | logit("Server does not support re-keying"); |
54506d2e | 917 | else |
918 | need_rekeying = 1; | |
919 | } | |
e092ce67 | 920 | continue; |
921 | ||
2e73a022 | 922 | case '&': |
2e73a022 | 923 | /* |
924 | * Detach the program (continue to serve connections, | |
925 | * but put in background and no more new connections). | |
926 | */ | |
2e73a022 | 927 | /* Restore tty modes. */ |
928 | leave_raw_mode(); | |
929 | ||
930 | /* Stop listening for new connections. */ | |
c6940381 | 931 | channel_stop_listening(); |
2e73a022 | 932 | |
c6940381 | 933 | snprintf(string, sizeof string, |
934 | "%c& [backgrounded]\n", escape_char); | |
935 | buffer_append(berr, string, strlen(string)); | |
2e73a022 | 936 | |
937 | /* Fork into background. */ | |
938 | pid = fork(); | |
939 | if (pid < 0) { | |
940 | error("fork: %.100s", strerror(errno)); | |
941 | continue; | |
942 | } | |
943 | if (pid != 0) { /* This is the parent. */ | |
944 | /* The parent just exits. */ | |
945 | exit(0); | |
946 | } | |
947 | /* The child continues serving connections. */ | |
c6940381 | 948 | if (compat20) { |
949 | buffer_append(bin, "\004", 1); | |
950 | /* fake EOF on stdin */ | |
951 | return -1; | |
952 | } else if (!stdin_eof) { | |
953 | /* | |
954 | * Sending SSH_CMSG_EOF alone does not always appear | |
955 | * to be enough. So we try to send an EOF character | |
956 | * first. | |
957 | */ | |
958 | packet_start(SSH_CMSG_STDIN_DATA); | |
959 | packet_put_string("\004", 1); | |
960 | packet_send(); | |
961 | /* Close stdin. */ | |
962 | stdin_eof = 1; | |
963 | if (buffer_len(bin) == 0) { | |
964 | packet_start(SSH_CMSG_EOF); | |
965 | packet_send(); | |
966 | } | |
967 | } | |
968 | continue; | |
2e73a022 | 969 | |
970 | case '?': | |
971 | snprintf(string, sizeof string, | |
972 | "%c?\r\n\ | |
973 | Supported escape sequences:\r\n\ | |
1d77f8cb | 974 | %c. - terminate connection\r\n\ |
16a79097 | 975 | %cB - send a BREAK to the remote system\r\n\ |
1d77f8cb | 976 | %cC - open a command line\r\n\ |
977 | %cR - Request rekey (SSH protocol 2 only)\r\n\ | |
978 | %c^Z - suspend ssh\r\n\ | |
979 | %c# - list forwarded connections\r\n\ | |
980 | %c& - background ssh (when waiting for connections to terminate)\r\n\ | |
981 | %c? - this message\r\n\ | |
982 | %c%c - send the escape character by typing it twice\r\n\ | |
2e73a022 | 983 | (Note that escapes are only recognized immediately after newline.)\r\n", |
1d77f8cb | 984 | escape_char, escape_char, escape_char, escape_char, |
985 | escape_char, escape_char, escape_char, escape_char, | |
16a79097 | 986 | escape_char, escape_char, escape_char); |
2e73a022 | 987 | buffer_append(berr, string, strlen(string)); |
988 | continue; | |
989 | ||
990 | case '#': | |
991 | snprintf(string, sizeof string, "%c#\r\n", escape_char); | |
992 | buffer_append(berr, string, strlen(string)); | |
993 | s = channel_open_message(); | |
994 | buffer_append(berr, s, strlen(s)); | |
995 | xfree(s); | |
996 | continue; | |
997 | ||
c53c54c2 | 998 | case 'C': |
ec9b7086 | 999 | process_cmdline(); |
c53c54c2 | 1000 | continue; |
1001 | ||
2e73a022 | 1002 | default: |
1003 | if (ch != escape_char) { | |
1004 | buffer_put_char(bin, escape_char); | |
1005 | bytes++; | |
1006 | } | |
1007 | /* Escaped characters fall through here */ | |
1008 | break; | |
1009 | } | |
1010 | } else { | |
1011 | /* | |
1012 | * The previous character was not an escape char. Check if this | |
1013 | * is an escape. | |
1014 | */ | |
1015 | if (last_was_cr && ch == escape_char) { | |
1016 | /* It is. Set the flag and continue to next character. */ | |
1017 | escape_pending = 1; | |
1018 | continue; | |
1019 | } | |
1020 | } | |
1021 | ||
1022 | /* | |
1023 | * Normal character. Record whether it was a newline, | |
1024 | * and append it to the buffer. | |
1025 | */ | |
1026 | last_was_cr = (ch == '\r' || ch == '\n'); | |
1027 | buffer_put_char(bin, ch); | |
1028 | bytes++; | |
1029 | } | |
1030 | return bytes; | |
1031 | } | |
1032 | ||
396c147e | 1033 | static void |
8ce64345 | 1034 | client_process_input(fd_set * readset) |
1035 | { | |
9da5c3c9 | 1036 | int len; |
2e73a022 | 1037 | char buf[8192]; |
8ce64345 | 1038 | |
5260325f | 1039 | /* Read input from stdin. */ |
1040 | if (FD_ISSET(fileno(stdin), readset)) { | |
1041 | /* Read as much as possible. */ | |
1042 | len = read(fileno(stdin), buf, sizeof(buf)); | |
cf6bc93c | 1043 | if (len < 0 && (errno == EAGAIN || errno == EINTR)) |
1044 | return; /* we'll try again later */ | |
5260325f | 1045 | if (len <= 0) { |
aa3378df | 1046 | /* |
1047 | * Received EOF or error. They are treated | |
1048 | * similarly, except that an error message is printed | |
1049 | * if it was an error condition. | |
1050 | */ | |
5260325f | 1051 | if (len < 0) { |
1052 | snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno)); | |
1053 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
5260325f | 1054 | } |
1055 | /* Mark that we have seen EOF. */ | |
1056 | stdin_eof = 1; | |
aa3378df | 1057 | /* |
1058 | * Send an EOF message to the server unless there is | |
1059 | * data in the buffer. If there is data in the | |
1060 | * buffer, no message will be sent now. Code | |
1061 | * elsewhere will send the EOF when the buffer | |
1062 | * becomes empty if stdin_eof is set. | |
1063 | */ | |
5260325f | 1064 | if (buffer_len(&stdin_buffer) == 0) { |
8efc0c15 | 1065 | packet_start(SSH_CMSG_EOF); |
1066 | packet_send(); | |
5260325f | 1067 | } |
4bf9c10e | 1068 | } else if (escape_char == SSH_ESCAPECHAR_NONE) { |
aa3378df | 1069 | /* |
1070 | * Normal successful read, and no escape character. | |
1071 | * Just append the data to buffer. | |
1072 | */ | |
5260325f | 1073 | buffer_append(&stdin_buffer, buf, len); |
5260325f | 1074 | } else { |
aa3378df | 1075 | /* |
1076 | * Normal, successful read. But we have an escape character | |
1077 | * and have to process the characters one by one. | |
1078 | */ | |
7e8911cd | 1079 | if (process_escapes(&stdin_buffer, &stdout_buffer, |
1080 | &stderr_buffer, buf, len) == -1) | |
2e73a022 | 1081 | return; |
5260325f | 1082 | } |
1083 | } | |
8efc0c15 | 1084 | } |
1085 | ||
396c147e | 1086 | static void |
5260325f | 1087 | client_process_output(fd_set * writeset) |
8efc0c15 | 1088 | { |
5260325f | 1089 | int len; |
1090 | char buf[100]; | |
1091 | ||
1092 | /* Write buffered output to stdout. */ | |
1093 | if (FD_ISSET(fileno(stdout), writeset)) { | |
1094 | /* Write as much data as possible. */ | |
1095 | len = write(fileno(stdout), buffer_ptr(&stdout_buffer), | |
a408af76 | 1096 | buffer_len(&stdout_buffer)); |
5260325f | 1097 | if (len <= 0) { |
cf6bc93c | 1098 | if (errno == EINTR || errno == EAGAIN) |
5260325f | 1099 | len = 0; |
1100 | else { | |
aa3378df | 1101 | /* |
1102 | * An error or EOF was encountered. Put an | |
1103 | * error message to stderr buffer. | |
1104 | */ | |
5260325f | 1105 | snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno)); |
1106 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
5260325f | 1107 | quit_pending = 1; |
1108 | return; | |
1109 | } | |
1110 | } | |
1111 | /* Consume printed data from the buffer. */ | |
1112 | buffer_consume(&stdout_buffer, len); | |
cd332296 | 1113 | stdout_bytes += len; |
5260325f | 1114 | } |
1115 | /* Write buffered output to stderr. */ | |
1116 | if (FD_ISSET(fileno(stderr), writeset)) { | |
1117 | /* Write as much data as possible. */ | |
1118 | len = write(fileno(stderr), buffer_ptr(&stderr_buffer), | |
a408af76 | 1119 | buffer_len(&stderr_buffer)); |
5260325f | 1120 | if (len <= 0) { |
cf6bc93c | 1121 | if (errno == EINTR || errno == EAGAIN) |
5260325f | 1122 | len = 0; |
1123 | else { | |
aa3378df | 1124 | /* EOF or error, but can't even print error message. */ |
5260325f | 1125 | quit_pending = 1; |
1126 | return; | |
1127 | } | |
1128 | } | |
1129 | /* Consume printed characters from the buffer. */ | |
1130 | buffer_consume(&stderr_buffer, len); | |
cd332296 | 1131 | stderr_bytes += len; |
8efc0c15 | 1132 | } |
8efc0c15 | 1133 | } |
1134 | ||
7368a6c8 | 1135 | /* |
1136 | * Get packets from the connection input buffer, and process them as long as | |
1137 | * there are packets available. | |
1138 | * | |
1139 | * Any unknown packets received during the actual | |
1140 | * session cause the session to terminate. This is | |
1141 | * intended to make debugging easier since no | |
1142 | * confirmations are sent. Any compatible protocol | |
1143 | * extensions must be negotiated during the | |
1144 | * preparatory phase. | |
1145 | */ | |
1146 | ||
396c147e | 1147 | static void |
5ca51e19 | 1148 | client_process_buffered_input_packets(void) |
7368a6c8 | 1149 | { |
e092ce67 | 1150 | dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL); |
7368a6c8 | 1151 | } |
1152 | ||
2e73a022 | 1153 | /* scan buf[] for '~' before sending data to the peer */ |
1154 | ||
396c147e | 1155 | static int |
2e73a022 | 1156 | simple_escape_filter(Channel *c, char *buf, int len) |
1157 | { | |
1158 | /* XXX we assume c->extended is writeable */ | |
1159 | return process_escapes(&c->input, &c->output, &c->extended, buf, len); | |
1160 | } | |
1161 | ||
396c147e | 1162 | static void |
eb0dd41f | 1163 | client_channel_closed(int id, void *arg) |
1164 | { | |
418e724c | 1165 | channel_cancel_cleanup(id); |
eb0dd41f | 1166 | session_closed = 1; |
82de775c | 1167 | leave_raw_mode(); |
eb0dd41f | 1168 | } |
1169 | ||
aa3378df | 1170 | /* |
1171 | * Implements the interactive session with the server. This is called after | |
1172 | * the user has been authenticated, and a command has been started on the | |
4bf9c10e | 1173 | * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character |
1174 | * used as an escape character for terminating or suspending the session. | |
aa3378df | 1175 | */ |
8efc0c15 | 1176 | |
6ae2364d | 1177 | int |
2e73a022 | 1178 | client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id) |
8efc0c15 | 1179 | { |
39929cdb | 1180 | fd_set *readset = NULL, *writeset = NULL; |
5260325f | 1181 | double start_time, total_time; |
9a995072 | 1182 | int max_fd = 0, max_fd2 = 0, len, rekeying = 0; |
1183 | u_int nalloc = 0; | |
5260325f | 1184 | char buf[100]; |
1185 | ||
1186 | debug("Entering interactive session."); | |
1187 | ||
1188 | start_time = get_current_time(); | |
1189 | ||
1190 | /* Initialize variables. */ | |
1191 | escape_pending = 0; | |
1192 | last_was_cr = 1; | |
1193 | exit_status = -1; | |
1194 | stdin_eof = 0; | |
1195 | buffer_high = 64 * 1024; | |
1196 | connection_in = packet_get_connection_in(); | |
1197 | connection_out = packet_get_connection_out(); | |
39929cdb | 1198 | max_fd = MAX(connection_in, connection_out); |
5e96b616 | 1199 | if (control_fd != -1) |
1200 | max_fd = MAX(max_fd, control_fd); | |
39929cdb | 1201 | |
1202 | if (!compat20) { | |
e968270c | 1203 | /* enable nonblocking unless tty */ |
1204 | if (!isatty(fileno(stdin))) | |
1205 | set_nonblock(fileno(stdin)); | |
1206 | if (!isatty(fileno(stdout))) | |
1207 | set_nonblock(fileno(stdout)); | |
1208 | if (!isatty(fileno(stderr))) | |
1209 | set_nonblock(fileno(stderr)); | |
39929cdb | 1210 | max_fd = MAX(max_fd, fileno(stdin)); |
1211 | max_fd = MAX(max_fd, fileno(stdout)); | |
1212 | max_fd = MAX(max_fd, fileno(stderr)); | |
1213 | } | |
5260325f | 1214 | stdin_bytes = 0; |
1215 | stdout_bytes = 0; | |
1216 | stderr_bytes = 0; | |
1217 | quit_pending = 0; | |
1218 | escape_char = escape_char_arg; | |
1219 | ||
1220 | /* Initialize buffers. */ | |
1221 | buffer_init(&stdin_buffer); | |
1222 | buffer_init(&stdout_buffer); | |
1223 | buffer_init(&stderr_buffer); | |
1224 | ||
7368a6c8 | 1225 | client_init_dispatch(); |
1226 | ||
3c93c917 | 1227 | /* |
1228 | * Set signal handlers, (e.g. to restore non-blocking mode) | |
1229 | * but don't overwrite SIG_IGN, matches behaviour from rsh(1) | |
1230 | */ | |
d3e5d1e9 | 1231 | if (signal(SIGHUP, SIG_IGN) != SIG_IGN) |
1232 | signal(SIGHUP, signal_handler); | |
3c93c917 | 1233 | if (signal(SIGINT, SIG_IGN) != SIG_IGN) |
1234 | signal(SIGINT, signal_handler); | |
1235 | if (signal(SIGQUIT, SIG_IGN) != SIG_IGN) | |
1236 | signal(SIGQUIT, signal_handler); | |
1237 | if (signal(SIGTERM, SIG_IGN) != SIG_IGN) | |
1238 | signal(SIGTERM, signal_handler); | |
2c9a4d41 | 1239 | signal(SIGWINCH, window_change_handler); |
5260325f | 1240 | |
5260325f | 1241 | if (have_pty) |
1242 | enter_raw_mode(); | |
1243 | ||
1fc8ccdf | 1244 | if (compat20) { |
1245 | session_ident = ssh2_chan_id; | |
4bf9c10e | 1246 | if (escape_char != SSH_ESCAPECHAR_NONE) |
1fc8ccdf | 1247 | channel_register_filter(session_ident, |
1248 | simple_escape_filter); | |
eb0dd41f | 1249 | if (session_ident != -1) |
1250 | channel_register_cleanup(session_ident, | |
1251 | client_channel_closed); | |
1fc8ccdf | 1252 | } else { |
1253 | /* Check if we should immediately send eof on stdin. */ | |
8ce64345 | 1254 | client_check_initial_eof_on_stdin(); |
1fc8ccdf | 1255 | } |
2e73a022 | 1256 | |
5260325f | 1257 | /* Main loop of the client for the interactive session mode. */ |
1258 | while (!quit_pending) { | |
5260325f | 1259 | |
aa3378df | 1260 | /* Process buffered packets sent by the server. */ |
5260325f | 1261 | client_process_buffered_input_packets(); |
1262 | ||
eb0dd41f | 1263 | if (compat20 && session_closed && !channel_still_open()) |
8ce64345 | 1264 | break; |
eb0dd41f | 1265 | |
1266 | rekeying = (xxx_kex != NULL && !xxx_kex->done); | |
8ce64345 | 1267 | |
c422989b | 1268 | if (rekeying) { |
1269 | debug("rekeying in progress"); | |
1270 | } else { | |
1271 | /* | |
1272 | * Make packets of buffered stdin data, and buffer | |
1273 | * them for sending to the server. | |
1274 | */ | |
1275 | if (!compat20) | |
1276 | client_make_packets_from_stdin_data(); | |
5260325f | 1277 | |
c422989b | 1278 | /* |
1279 | * Make packets from buffered channel data, and | |
1280 | * enqueue them for sending to the server. | |
1281 | */ | |
1282 | if (packet_not_very_much_data_to_write()) | |
1283 | channel_output_poll(); | |
5260325f | 1284 | |
c422989b | 1285 | /* |
1286 | * Check if the window size has changed, and buffer a | |
1287 | * message about it to the server if so. | |
1288 | */ | |
1289 | client_check_window_change(); | |
5260325f | 1290 | |
c422989b | 1291 | if (quit_pending) |
1292 | break; | |
1293 | } | |
aa3378df | 1294 | /* |
1295 | * Wait until we have something to do (something becomes | |
1296 | * available on one of the descriptors). | |
1297 | */ | |
489aa2e9 | 1298 | max_fd2 = max_fd; |
c422989b | 1299 | client_wait_until_can_do_something(&readset, &writeset, |
489aa2e9 | 1300 | &max_fd2, &nalloc, rekeying); |
5260325f | 1301 | |
1302 | if (quit_pending) | |
1303 | break; | |
1304 | ||
c422989b | 1305 | /* Do channel operations unless rekeying in progress. */ |
1306 | if (!rekeying) { | |
1307 | channel_after_select(readset, writeset); | |
ffd7b36b | 1308 | if (need_rekeying || packet_need_rekeying()) { |
1309 | debug("need rekeying"); | |
c422989b | 1310 | xxx_kex->done = 0; |
1311 | kex_send_kexinit(xxx_kex); | |
1312 | need_rekeying = 0; | |
1313 | } | |
1314 | } | |
5260325f | 1315 | |
8ce64345 | 1316 | /* Buffer input from the connection. */ |
39929cdb | 1317 | client_process_net_input(readset); |
5260325f | 1318 | |
5e96b616 | 1319 | /* Accept control connections. */ |
1320 | client_process_control(readset); | |
1321 | ||
8ce64345 | 1322 | if (quit_pending) |
1323 | break; | |
1324 | ||
1325 | if (!compat20) { | |
1326 | /* Buffer data from stdin */ | |
39929cdb | 1327 | client_process_input(readset); |
8ce64345 | 1328 | /* |
1329 | * Process output to stdout and stderr. Output to | |
1330 | * the connection is processed elsewhere (above). | |
1331 | */ | |
39929cdb | 1332 | client_process_output(writeset); |
8ce64345 | 1333 | } |
5260325f | 1334 | |
aa3378df | 1335 | /* Send as much buffered packet data as possible to the sender. */ |
39929cdb | 1336 | if (FD_ISSET(connection_out, writeset)) |
5260325f | 1337 | packet_write_poll(); |
1338 | } | |
39929cdb | 1339 | if (readset) |
1340 | xfree(readset); | |
1341 | if (writeset) | |
1342 | xfree(writeset); | |
5260325f | 1343 | |
1344 | /* Terminate the session. */ | |
1345 | ||
1346 | /* Stop watching for window change. */ | |
2c9a4d41 | 1347 | signal(SIGWINCH, SIG_DFL); |
5260325f | 1348 | |
d6746a0b | 1349 | channel_free_all(); |
5260325f | 1350 | |
c9130033 | 1351 | if (have_pty) |
1352 | leave_raw_mode(); | |
89aa792b | 1353 | |
1354 | /* restore blocking io */ | |
1355 | if (!isatty(fileno(stdin))) | |
1356 | unset_nonblock(fileno(stdin)); | |
1357 | if (!isatty(fileno(stdout))) | |
1358 | unset_nonblock(fileno(stdout)); | |
1359 | if (!isatty(fileno(stderr))) | |
1360 | unset_nonblock(fileno(stderr)); | |
1361 | ||
66357af5 | 1362 | /* |
1363 | * If there was no shell or command requested, there will be no remote | |
1364 | * exit status to be returned. In that case, clear error code if the | |
1365 | * connection was deliberately terminated at this end. | |
1366 | */ | |
1367 | if (no_shell_flag && received_signal == SIGTERM) { | |
1368 | received_signal = 0; | |
1369 | exit_status = 0; | |
1370 | } | |
1371 | ||
82de775c | 1372 | if (received_signal) |
010f9726 | 1373 | fatal("Killed by signal %d.", (int) received_signal); |
c9130033 | 1374 | |
1375 | /* | |
1376 | * In interactive mode (with pseudo tty) display a message indicating | |
1377 | * that the connection has been closed. | |
1378 | */ | |
1379 | if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) { | |
1380 | snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host); | |
1381 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
1382 | } | |
1383 | ||
5260325f | 1384 | /* Output any buffered data for stdout. */ |
89aa792b | 1385 | while (buffer_len(&stdout_buffer) > 0) { |
1386 | len = write(fileno(stdout), buffer_ptr(&stdout_buffer), | |
a408af76 | 1387 | buffer_len(&stdout_buffer)); |
89aa792b | 1388 | if (len <= 0) { |
5260325f | 1389 | error("Write failed flushing stdout buffer."); |
89aa792b | 1390 | break; |
1391 | } | |
5260325f | 1392 | buffer_consume(&stdout_buffer, len); |
cd332296 | 1393 | stdout_bytes += len; |
8efc0c15 | 1394 | } |
5260325f | 1395 | |
1396 | /* Output any buffered data for stderr. */ | |
89aa792b | 1397 | while (buffer_len(&stderr_buffer) > 0) { |
1398 | len = write(fileno(stderr), buffer_ptr(&stderr_buffer), | |
a408af76 | 1399 | buffer_len(&stderr_buffer)); |
89aa792b | 1400 | if (len <= 0) { |
5260325f | 1401 | error("Write failed flushing stderr buffer."); |
89aa792b | 1402 | break; |
1403 | } | |
5260325f | 1404 | buffer_consume(&stderr_buffer, len); |
cd332296 | 1405 | stderr_bytes += len; |
5260325f | 1406 | } |
1407 | ||
5260325f | 1408 | /* Clear and free any buffers. */ |
1409 | memset(buf, 0, sizeof(buf)); | |
1410 | buffer_free(&stdin_buffer); | |
1411 | buffer_free(&stdout_buffer); | |
1412 | buffer_free(&stderr_buffer); | |
1413 | ||
1414 | /* Report bytes transferred, and transfer rates. */ | |
1415 | total_time = get_current_time() - start_time; | |
1416 | debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds", | |
184eed6a | 1417 | stdin_bytes, stdout_bytes, stderr_bytes, total_time); |
5260325f | 1418 | if (total_time > 0) |
1419 | debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f", | |
184eed6a | 1420 | stdin_bytes / total_time, stdout_bytes / total_time, |
1421 | stderr_bytes / total_time); | |
5260325f | 1422 | |
1423 | /* Return the exit status of the program. */ | |
1424 | debug("Exit status %d", exit_status); | |
1425 | return exit_status; | |
8efc0c15 | 1426 | } |
7368a6c8 | 1427 | |
1428 | /*********/ | |
1429 | ||
396c147e | 1430 | static void |
7819b5c3 | 1431 | client_input_stdout_data(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 1432 | { |
1e3b8b07 | 1433 | u_int data_len; |
7368a6c8 | 1434 | char *data = packet_get_string(&data_len); |
95500969 | 1435 | packet_check_eom(); |
7368a6c8 | 1436 | buffer_append(&stdout_buffer, data, data_len); |
7368a6c8 | 1437 | memset(data, 0, data_len); |
1438 | xfree(data); | |
1439 | } | |
396c147e | 1440 | static void |
7819b5c3 | 1441 | client_input_stderr_data(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 1442 | { |
1e3b8b07 | 1443 | u_int data_len; |
7368a6c8 | 1444 | char *data = packet_get_string(&data_len); |
95500969 | 1445 | packet_check_eom(); |
7368a6c8 | 1446 | buffer_append(&stderr_buffer, data, data_len); |
7368a6c8 | 1447 | memset(data, 0, data_len); |
1448 | xfree(data); | |
1449 | } | |
396c147e | 1450 | static void |
7819b5c3 | 1451 | client_input_exit_status(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 1452 | { |
7368a6c8 | 1453 | exit_status = packet_get_int(); |
95500969 | 1454 | packet_check_eom(); |
7368a6c8 | 1455 | /* Acknowledge the exit. */ |
1456 | packet_start(SSH_CMSG_EXIT_CONFIRMATION); | |
1457 | packet_send(); | |
1458 | /* | |
1459 | * Must wait for packet to be sent since we are | |
1460 | * exiting the loop. | |
1461 | */ | |
1462 | packet_write_wait(); | |
1463 | /* Flag that we want to exit. */ | |
1464 | quit_pending = 1; | |
1465 | } | |
c15706e2 | 1466 | static void |
1467 | client_input_agent_open(int type, u_int32_t seq, void *ctxt) | |
1468 | { | |
1469 | Channel *c = NULL; | |
1470 | int remote_id, sock; | |
1471 | ||
1472 | /* Read the remote channel number from the message. */ | |
1473 | remote_id = packet_get_int(); | |
1474 | packet_check_eom(); | |
1475 | ||
1476 | /* | |
1477 | * Get a connection to the local authentication agent (this may again | |
1478 | * get forwarded). | |
1479 | */ | |
1480 | sock = ssh_get_authentication_socket(); | |
1481 | ||
1482 | /* | |
1483 | * If we could not connect the agent, send an error message back to | |
1484 | * the server. This should never happen unless the agent dies, | |
1485 | * because authentication forwarding is only enabled if we have an | |
1486 | * agent. | |
1487 | */ | |
1488 | if (sock >= 0) { | |
1489 | c = channel_new("", SSH_CHANNEL_OPEN, sock, sock, | |
1490 | -1, 0, 0, 0, "authentication agent connection", 1); | |
1491 | c->remote_id = remote_id; | |
1492 | c->force_drain = 1; | |
1493 | } | |
1494 | if (c == NULL) { | |
1495 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
1496 | packet_put_int(remote_id); | |
1497 | } else { | |
1498 | /* Send a confirmation to the remote host. */ | |
1499 | debug("Forwarding authentication connection."); | |
1500 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1501 | packet_put_int(remote_id); | |
1502 | packet_put_int(c->self); | |
1503 | } | |
1504 | packet_send(); | |
1505 | } | |
7368a6c8 | 1506 | |
396c147e | 1507 | static Channel * |
fa08c86b | 1508 | client_request_forwarded_tcpip(const char *request_type, int rchan) |
1509 | { | |
343288b8 | 1510 | Channel *c = NULL; |
fa08c86b | 1511 | char *listen_address, *originator_address; |
1512 | int listen_port, originator_port; | |
719fc62f | 1513 | int sock; |
fa08c86b | 1514 | |
1515 | /* Get rest of the packet */ | |
1516 | listen_address = packet_get_string(NULL); | |
1517 | listen_port = packet_get_int(); | |
1518 | originator_address = packet_get_string(NULL); | |
1519 | originator_port = packet_get_int(); | |
95500969 | 1520 | packet_check_eom(); |
fa08c86b | 1521 | |
1522 | debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d", | |
1523 | listen_address, listen_port, originator_address, originator_port); | |
1524 | ||
b3f8a79c | 1525 | sock = channel_connect_by_listen_address(listen_port); |
719fc62f | 1526 | if (sock < 0) { |
1527 | xfree(originator_address); | |
1528 | xfree(listen_address); | |
1529 | return NULL; | |
1530 | } | |
1531 | c = channel_new("forwarded-tcpip", | |
1532 | SSH_CHANNEL_CONNECTING, sock, sock, -1, | |
1533 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0, | |
0d942eff | 1534 | originator_address, 1); |
fa08c86b | 1535 | xfree(originator_address); |
1536 | xfree(listen_address); | |
1537 | return c; | |
1538 | } | |
1539 | ||
343288b8 | 1540 | static Channel * |
fa08c86b | 1541 | client_request_x11(const char *request_type, int rchan) |
1542 | { | |
1543 | Channel *c = NULL; | |
1544 | char *originator; | |
1545 | int originator_port; | |
719fc62f | 1546 | int sock; |
fa08c86b | 1547 | |
1548 | if (!options.forward_x11) { | |
1549 | error("Warning: ssh server tried X11 forwarding."); | |
1550 | error("Warning: this is probably a break in attempt by a malicious server."); | |
1551 | return NULL; | |
1552 | } | |
1553 | originator = packet_get_string(NULL); | |
1554 | if (datafellows & SSH_BUG_X11FWD) { | |
1555 | debug2("buggy server: x11 request w/o originator_port"); | |
1556 | originator_port = 0; | |
1557 | } else { | |
1558 | originator_port = packet_get_int(); | |
1559 | } | |
95500969 | 1560 | packet_check_eom(); |
fa08c86b | 1561 | /* XXX check permission */ |
865ac82e | 1562 | debug("client_request_x11: request from %s %d", originator, |
1563 | originator_port); | |
719fc62f | 1564 | xfree(originator); |
fa08c86b | 1565 | sock = x11_connect_display(); |
719fc62f | 1566 | if (sock < 0) |
1567 | return NULL; | |
1568 | c = channel_new("x11", | |
1569 | SSH_CHANNEL_X11_OPEN, sock, sock, -1, | |
0d942eff | 1570 | CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1); |
a5f82435 | 1571 | c->force_drain = 1; |
fa08c86b | 1572 | return c; |
1573 | } | |
1574 | ||
343288b8 | 1575 | static Channel * |
fa08c86b | 1576 | client_request_agent(const char *request_type, int rchan) |
1577 | { | |
1578 | Channel *c = NULL; | |
719fc62f | 1579 | int sock; |
fa08c86b | 1580 | |
1581 | if (!options.forward_agent) { | |
1582 | error("Warning: ssh server tried agent forwarding."); | |
1583 | error("Warning: this is probably a break in attempt by a malicious server."); | |
1584 | return NULL; | |
1585 | } | |
1586 | sock = ssh_get_authentication_socket(); | |
719fc62f | 1587 | if (sock < 0) |
1588 | return NULL; | |
1589 | c = channel_new("authentication agent connection", | |
1590 | SSH_CHANNEL_OPEN, sock, sock, -1, | |
1591 | CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0, | |
0d942eff | 1592 | "authentication agent connection", 1); |
a5f82435 | 1593 | c->force_drain = 1; |
fa08c86b | 1594 | return c; |
1595 | } | |
1596 | ||
0b242b12 | 1597 | /* XXXX move to generic input handler */ |
396c147e | 1598 | static void |
7819b5c3 | 1599 | client_input_channel_open(int type, u_int32_t seq, void *ctxt) |
0b242b12 | 1600 | { |
1601 | Channel *c = NULL; | |
1602 | char *ctype; | |
0b242b12 | 1603 | int rchan; |
f91d9a89 | 1604 | u_int rmaxpack, rwindow, len; |
0b242b12 | 1605 | |
1606 | ctype = packet_get_string(&len); | |
1607 | rchan = packet_get_int(); | |
1608 | rwindow = packet_get_int(); | |
1609 | rmaxpack = packet_get_int(); | |
1610 | ||
1d1ffb87 | 1611 | debug("client_input_channel_open: ctype %s rchan %d win %d max %d", |
0b242b12 | 1612 | ctype, rchan, rwindow, rmaxpack); |
1613 | ||
fa08c86b | 1614 | if (strcmp(ctype, "forwarded-tcpip") == 0) { |
1615 | c = client_request_forwarded_tcpip(ctype, rchan); | |
1616 | } else if (strcmp(ctype, "x11") == 0) { | |
1617 | c = client_request_x11(ctype, rchan); | |
1618 | } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) { | |
1619 | c = client_request_agent(ctype, rchan); | |
0b242b12 | 1620 | } |
1621 | /* XXX duplicate : */ | |
1622 | if (c != NULL) { | |
1623 | debug("confirm %s", ctype); | |
1624 | c->remote_id = rchan; | |
1625 | c->remote_window = rwindow; | |
1626 | c->remote_maxpacket = rmaxpack; | |
a01a10dd | 1627 | if (c->type != SSH_CHANNEL_CONNECTING) { |
1628 | packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1629 | packet_put_int(c->remote_id); | |
1630 | packet_put_int(c->self); | |
1631 | packet_put_int(c->local_window); | |
1632 | packet_put_int(c->local_maxpacket); | |
1633 | packet_send(); | |
1634 | } | |
0b242b12 | 1635 | } else { |
1636 | debug("failure %s", ctype); | |
1637 | packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); | |
1638 | packet_put_int(rchan); | |
1639 | packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED); | |
fbe90f7b | 1640 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { |
a01a10dd | 1641 | packet_put_cstring("open failed"); |
fbe90f7b | 1642 | packet_put_cstring(""); |
1643 | } | |
0b242b12 | 1644 | packet_send(); |
1645 | } | |
1646 | xfree(ctype); | |
1647 | } | |
396c147e | 1648 | static void |
7819b5c3 | 1649 | client_input_channel_req(int type, u_int32_t seq, void *ctxt) |
1fc8ccdf | 1650 | { |
1651 | Channel *c = NULL; | |
5e96b616 | 1652 | int exitval, id, reply, success = 0; |
1fc8ccdf | 1653 | char *rtype; |
1654 | ||
1655 | id = packet_get_int(); | |
1656 | rtype = packet_get_string(NULL); | |
1657 | reply = packet_get_char(); | |
1658 | ||
1659 | debug("client_input_channel_req: channel %d rtype %s reply %d", | |
1660 | id, rtype, reply); | |
1661 | ||
13de3560 | 1662 | if (id == -1) { |
1663 | error("client_input_channel_req: request for channel -1"); | |
1664 | } else if ((c = channel_lookup(id)) == NULL) { | |
1fc8ccdf | 1665 | error("client_input_channel_req: channel %d: unknown channel", id); |
1666 | } else if (strcmp(rtype, "exit-status") == 0) { | |
5e96b616 | 1667 | exitval = packet_get_int(); |
1668 | if (id == session_ident) { | |
1669 | success = 1; | |
1670 | exit_status = exitval; | |
1671 | } else if (c->ctl_fd == -1) { | |
1672 | error("client_input_channel_req: unexpected channel %d", | |
1673 | session_ident); | |
1674 | } else { | |
1675 | atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval)); | |
1676 | success = 1; | |
1677 | } | |
95500969 | 1678 | packet_check_eom(); |
1fc8ccdf | 1679 | } |
1680 | if (reply) { | |
1681 | packet_start(success ? | |
1682 | SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE); | |
13de3560 | 1683 | packet_put_int(id); |
1fc8ccdf | 1684 | packet_send(); |
1685 | } | |
1686 | xfree(rtype); | |
1687 | } | |
3d209bbe | 1688 | static void |
1689 | client_input_global_request(int type, u_int32_t seq, void *ctxt) | |
1690 | { | |
1691 | char *rtype; | |
1692 | int want_reply; | |
1693 | int success = 0; | |
1694 | ||
1695 | rtype = packet_get_string(NULL); | |
1696 | want_reply = packet_get_char(); | |
5d8d32a3 | 1697 | debug("client_input_global_request: rtype %s want_reply %d", |
1698 | rtype, want_reply); | |
3d209bbe | 1699 | if (want_reply) { |
1700 | packet_start(success ? | |
1701 | SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE); | |
1702 | packet_send(); | |
1703 | packet_write_wait(); | |
1704 | } | |
1705 | xfree(rtype); | |
1706 | } | |
0b242b12 | 1707 | |
5e96b616 | 1708 | void |
f2107e97 | 1709 | client_session2_setup(int id, int want_tty, int want_subsystem, |
1786be35 | 1710 | const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env, |
5e96b616 | 1711 | dispatch_fn *subsys_repl) |
1712 | { | |
1713 | int len; | |
2c9a4d41 | 1714 | Channel *c = NULL; |
5e96b616 | 1715 | |
1716 | debug2("%s: id %d", __func__, id); | |
1717 | ||
2c9a4d41 | 1718 | if ((c = channel_lookup(id)) == NULL) |
1719 | fatal("client_session2_setup: channel %d: unknown channel", id); | |
1720 | ||
5e96b616 | 1721 | if (want_tty) { |
1722 | struct winsize ws; | |
1723 | struct termios tio; | |
1724 | ||
1725 | /* Store window size in the packet. */ | |
1726 | if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0) | |
1727 | memset(&ws, 0, sizeof(ws)); | |
1728 | ||
1729 | channel_request_start(id, "pty-req", 0); | |
1730 | packet_put_cstring(term != NULL ? term : ""); | |
1731 | packet_put_int(ws.ws_col); | |
1732 | packet_put_int(ws.ws_row); | |
1733 | packet_put_int(ws.ws_xpixel); | |
1734 | packet_put_int(ws.ws_ypixel); | |
1735 | tio = get_saved_tio(); | |
1736 | tty_make_modes(-1, tiop != NULL ? tiop : &tio); | |
1737 | packet_send(); | |
1738 | /* XXX wait for reply */ | |
2c9a4d41 | 1739 | c->client_tty = 1; |
5e96b616 | 1740 | } |
1741 | ||
1742 | /* Transfer any environment variables from client to server */ | |
1786be35 | 1743 | if (options.num_send_env != 0 && env != NULL) { |
5e96b616 | 1744 | int i, j, matched; |
5e96b616 | 1745 | char *name, *val; |
1746 | ||
1747 | debug("Sending environment."); | |
1786be35 | 1748 | for (i = 0; env[i] != NULL; i++) { |
5e96b616 | 1749 | /* Split */ |
1786be35 | 1750 | name = xstrdup(env[i]); |
5e96b616 | 1751 | if ((val = strchr(name, '=')) == NULL) { |
1752 | free(name); | |
1753 | continue; | |
1754 | } | |
1755 | *val++ = '\0'; | |
1756 | ||
1757 | matched = 0; | |
1758 | for (j = 0; j < options.num_send_env; j++) { | |
1759 | if (match_pattern(name, options.send_env[j])) { | |
1760 | matched = 1; | |
1761 | break; | |
1762 | } | |
1763 | } | |
1764 | if (!matched) { | |
1765 | debug3("Ignored env %s", name); | |
1766 | free(name); | |
1767 | continue; | |
1768 | } | |
1769 | ||
1770 | debug("Sending env %s = %s", name, val); | |
1771 | channel_request_start(id, "env", 0); | |
1772 | packet_put_cstring(name); | |
1773 | packet_put_cstring(val); | |
1774 | packet_send(); | |
1775 | free(name); | |
1776 | } | |
1777 | } | |
1778 | ||
1779 | len = buffer_len(cmd); | |
1780 | if (len > 0) { | |
1781 | if (len > 900) | |
1782 | len = 900; | |
1783 | if (want_subsystem) { | |
1784 | debug("Sending subsystem: %.*s", len, (u_char*)buffer_ptr(cmd)); | |
1785 | channel_request_start(id, "subsystem", subsys_repl != NULL); | |
1786 | if (subsys_repl != NULL) { | |
1787 | /* register callback for reply */ | |
1788 | /* XXX we assume that client_loop has already been called */ | |
1789 | dispatch_set(SSH2_MSG_CHANNEL_FAILURE, subsys_repl); | |
1790 | dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, subsys_repl); | |
1791 | } | |
1792 | } else { | |
1793 | debug("Sending command: %.*s", len, (u_char*)buffer_ptr(cmd)); | |
1794 | channel_request_start(id, "exec", 0); | |
1795 | } | |
1796 | packet_put_string(buffer_ptr(cmd), buffer_len(cmd)); | |
1797 | packet_send(); | |
1798 | } else { | |
1799 | channel_request_start(id, "shell", 0); | |
1800 | packet_send(); | |
1801 | } | |
1802 | } | |
1803 | ||
396c147e | 1804 | static void |
5ca51e19 | 1805 | client_init_dispatch_20(void) |
8ce64345 | 1806 | { |
7a37c112 | 1807 | dispatch_init(&dispatch_protocol_error); |
e0ae8728 | 1808 | |
8ce64345 | 1809 | dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose); |
1810 | dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data); | |
1811 | dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof); | |
1812 | dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data); | |
0b242b12 | 1813 | dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open); |
8ce64345 | 1814 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); |
1815 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); | |
1fc8ccdf | 1816 | dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req); |
8ce64345 | 1817 | dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust); |
3d209bbe | 1818 | dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request); |
7a37c112 | 1819 | |
1820 | /* rekeying */ | |
1821 | dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit); | |
e0ae8728 | 1822 | |
1823 | /* global request reply messages */ | |
1824 | dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply); | |
1825 | dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply); | |
8ce64345 | 1826 | } |
396c147e | 1827 | static void |
5ca51e19 | 1828 | client_init_dispatch_13(void) |
7368a6c8 | 1829 | { |
1830 | dispatch_init(NULL); | |
1831 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close); | |
1832 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation); | |
1833 | dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data); | |
7368a6c8 | 1834 | dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); |
1835 | dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); | |
1836 | dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open); | |
7368a6c8 | 1837 | dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status); |
1838 | dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data); | |
1839 | dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data); | |
a22aff1f | 1840 | |
1841 | dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ? | |
c15706e2 | 1842 | &client_input_agent_open : &deny_input_open); |
a22aff1f | 1843 | dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ? |
1844 | &x11_input_open : &deny_input_open); | |
7368a6c8 | 1845 | } |
396c147e | 1846 | static void |
5ca51e19 | 1847 | client_init_dispatch_15(void) |
7368a6c8 | 1848 | { |
1849 | client_init_dispatch_13(); | |
1850 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof); | |
1851 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose); | |
1852 | } | |
eea46d13 | 1853 | static void |
5ca51e19 | 1854 | client_init_dispatch(void) |
7368a6c8 | 1855 | { |
8ce64345 | 1856 | if (compat20) |
1857 | client_init_dispatch_20(); | |
1858 | else if (compat13) | |
7368a6c8 | 1859 | client_init_dispatch_13(); |
1860 | else | |
1861 | client_init_dispatch_15(); | |
1862 | } | |
82de775c | 1863 | |
1864 | /* client specific fatal cleanup */ | |
1865 | void | |
2362db19 | 1866 | cleanup_exit(int i) |
82de775c | 1867 | { |
82de775c | 1868 | leave_raw_mode(); |
1869 | leave_non_blocking(); | |
5e96b616 | 1870 | if (options.control_path != NULL && control_fd != -1) |
1871 | unlink(options.control_path); | |
2362db19 | 1872 | _exit(i); |
82de775c | 1873 | } |