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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" | |
9a995072 | 62 | RCSID("$OpenBSD: clientloop.c,v 1.130 2004/08/11 21:43:04 avsm 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 | struct winsize oldws, newws; |
436 | ||
437 | /* Flush stdout and stderr buffers. */ | |
2e73a022 | 438 | if (buffer_len(bout) > 0) |
dc54438a | 439 | atomicio(vwrite, fileno(stdout), buffer_ptr(bout), buffer_len(bout)); |
2e73a022 | 440 | if (buffer_len(berr) > 0) |
dc54438a | 441 | atomicio(vwrite, fileno(stderr), buffer_ptr(berr), buffer_len(berr)); |
5260325f | 442 | |
5260325f | 443 | leave_raw_mode(); |
444 | ||
aa3378df | 445 | /* |
446 | * Free (and clear) the buffer to reduce the amount of data that gets | |
447 | * written to swap. | |
448 | */ | |
2e73a022 | 449 | buffer_free(bin); |
450 | buffer_free(bout); | |
451 | buffer_free(berr); | |
5260325f | 452 | |
453 | /* Save old window size. */ | |
454 | ioctl(fileno(stdin), TIOCGWINSZ, &oldws); | |
455 | ||
456 | /* Send the suspend signal to the program itself. */ | |
457 | kill(getpid(), SIGTSTP); | |
458 | ||
459 | /* Check if the window size has changed. */ | |
460 | if (ioctl(fileno(stdin), TIOCGWINSZ, &newws) >= 0 && | |
461 | (oldws.ws_row != newws.ws_row || | |
184eed6a | 462 | oldws.ws_col != newws.ws_col || |
463 | oldws.ws_xpixel != newws.ws_xpixel || | |
464 | oldws.ws_ypixel != newws.ws_ypixel)) | |
5260325f | 465 | received_window_change_signal = 1; |
466 | ||
467 | /* OK, we have been continued by the user. Reinitialize buffers. */ | |
2e73a022 | 468 | buffer_init(bin); |
469 | buffer_init(bout); | |
470 | buffer_init(berr); | |
5260325f | 471 | |
5260325f | 472 | enter_raw_mode(); |
8efc0c15 | 473 | } |
474 | ||
396c147e | 475 | static void |
8ce64345 | 476 | client_process_net_input(fd_set * readset) |
8efc0c15 | 477 | { |
8ce64345 | 478 | int len; |
479 | char buf[8192]; | |
5260325f | 480 | |
aa3378df | 481 | /* |
482 | * Read input from the server, and add any such data to the buffer of | |
483 | * the packet subsystem. | |
484 | */ | |
5260325f | 485 | if (FD_ISSET(connection_in, readset)) { |
486 | /* Read as much as possible. */ | |
487 | len = read(connection_in, buf, sizeof(buf)); | |
488 | if (len == 0) { | |
489 | /* Received EOF. The remote host has closed the connection. */ | |
490 | snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n", | |
491 | host); | |
8efc0c15 | 492 | buffer_append(&stderr_buffer, buf, strlen(buf)); |
8efc0c15 | 493 | quit_pending = 1; |
494 | return; | |
5260325f | 495 | } |
aa3378df | 496 | /* |
497 | * There is a kernel bug on Solaris that causes select to | |
498 | * sometimes wake up even though there is no data available. | |
499 | */ | |
09cb311c | 500 | if (len < 0 && (errno == EAGAIN || errno == EINTR)) |
5260325f | 501 | len = 0; |
502 | ||
503 | if (len < 0) { | |
504 | /* An error has encountered. Perhaps there is a network problem. */ | |
505 | snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n", | |
506 | host, strerror(errno)); | |
507 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
5260325f | 508 | quit_pending = 1; |
509 | return; | |
510 | } | |
511 | packet_process_incoming(buf, len); | |
512 | } | |
8ce64345 | 513 | } |
514 | ||
5e96b616 | 515 | static void |
516 | client_subsystem_reply(int type, u_int32_t seq, void *ctxt) | |
517 | { | |
518 | int id; | |
519 | Channel *c; | |
f2107e97 | 520 | |
5e96b616 | 521 | id = packet_get_int(); |
522 | packet_check_eom(); | |
523 | ||
524 | if ((c = channel_lookup(id)) == NULL) { | |
525 | error("%s: no channel for id %d", __func__, id); | |
526 | return; | |
527 | } | |
528 | ||
529 | if (type == SSH2_MSG_CHANNEL_SUCCESS) | |
530 | debug2("Request suceeded on channel %d", id); | |
531 | else if (type == SSH2_MSG_CHANNEL_FAILURE) { | |
532 | error("Request failed on channel %d", id); | |
533 | channel_free(c); | |
534 | } | |
535 | } | |
536 | ||
537 | static void | |
538 | client_extra_session2_setup(int id, void *arg) | |
539 | { | |
540 | struct confirm_ctx *cctx = arg; | |
541 | Channel *c; | |
1786be35 | 542 | int i; |
f2107e97 | 543 | |
5e96b616 | 544 | if (cctx == NULL) |
545 | fatal("%s: cctx == NULL", __func__); | |
546 | if ((c = channel_lookup(id)) == NULL) | |
547 | fatal("%s: no channel for id %d", __func__, id); | |
548 | ||
f2107e97 | 549 | client_session2_setup(id, cctx->want_tty, cctx->want_subsys, |
1786be35 | 550 | cctx->term, &cctx->tio, c->rfd, &cctx->cmd, cctx->env, |
5e96b616 | 551 | client_subsystem_reply); |
0d34d6ce | 552 | |
5e96b616 | 553 | c->confirm_ctx = NULL; |
554 | buffer_free(&cctx->cmd); | |
1786be35 | 555 | xfree(cctx->term); |
556 | if (cctx->env != NULL) { | |
557 | for (i = 0; cctx->env[i] != NULL; i++) | |
558 | xfree(cctx->env[i]); | |
559 | xfree(cctx->env); | |
f2107e97 | 560 | } |
1786be35 | 561 | xfree(cctx); |
5e96b616 | 562 | } |
563 | ||
564 | static void | |
565 | client_process_control(fd_set * readset) | |
566 | { | |
567 | Buffer m; | |
568 | Channel *c; | |
0d34d6ce | 569 | int client_fd, new_fd[3], ver, i, allowed; |
5e96b616 | 570 | socklen_t addrlen; |
571 | struct sockaddr_storage addr; | |
572 | struct confirm_ctx *cctx; | |
573 | char *cmd; | |
1786be35 | 574 | u_int len, env_len; |
5e96b616 | 575 | uid_t euid; |
576 | gid_t egid; | |
577 | ||
578 | /* | |
579 | * Accept connection on control socket | |
580 | */ | |
581 | if (control_fd == -1 || !FD_ISSET(control_fd, readset)) | |
582 | return; | |
583 | ||
584 | memset(&addr, 0, sizeof(addr)); | |
585 | addrlen = sizeof(addr); | |
586 | if ((client_fd = accept(control_fd, | |
587 | (struct sockaddr*)&addr, &addrlen)) == -1) { | |
588 | error("%s accept: %s", __func__, strerror(errno)); | |
589 | return; | |
590 | } | |
591 | ||
592 | if (getpeereid(client_fd, &euid, &egid) < 0) { | |
593 | error("%s getpeereid failed: %s", __func__, strerror(errno)); | |
594 | close(client_fd); | |
595 | return; | |
596 | } | |
597 | if ((euid != 0) && (getuid() != euid)) { | |
598 | error("control mode uid mismatch: peer euid %u != uid %u", | |
599 | (u_int) euid, (u_int) getuid()); | |
600 | close(client_fd); | |
601 | return; | |
602 | } | |
0d34d6ce | 603 | |
604 | allowed = 1; | |
605 | if (options.control_master == 2) { | |
606 | char *p, prompt[1024]; | |
607 | ||
608 | allowed = 0; | |
609 | snprintf(prompt, sizeof(prompt), | |
610 | "Allow shared connection to %s? ", host); | |
611 | p = read_passphrase(prompt, RP_USE_ASKPASS|RP_ALLOW_EOF); | |
612 | if (p != NULL) { | |
613 | /* | |
614 | * Accept empty responses and responses consisting | |
615 | * of the word "yes" as affirmative. | |
616 | */ | |
f2107e97 | 617 | if (*p == '\0' || *p == '\n' || |
0d34d6ce | 618 | strcasecmp(p, "yes") == 0) |
619 | allowed = 1; | |
620 | xfree(p); | |
621 | } | |
622 | } | |
5e96b616 | 623 | |
624 | unset_nonblock(client_fd); | |
625 | ||
626 | buffer_init(&m); | |
627 | ||
0d34d6ce | 628 | buffer_put_int(&m, allowed); |
5e96b616 | 629 | buffer_put_int(&m, getpid()); |
630 | if (ssh_msg_send(client_fd, /* version */0, &m) == -1) { | |
631 | error("%s: client msg_send failed", __func__); | |
632 | close(client_fd); | |
0d34d6ce | 633 | buffer_free(&m); |
5e96b616 | 634 | return; |
635 | } | |
636 | buffer_clear(&m); | |
637 | ||
0d34d6ce | 638 | if (!allowed) { |
639 | error("Refused control connection"); | |
640 | close(client_fd); | |
641 | buffer_free(&m); | |
642 | return; | |
643 | } | |
644 | ||
5e96b616 | 645 | if (ssh_msg_recv(client_fd, &m) == -1) { |
646 | error("%s: client msg_recv failed", __func__); | |
647 | close(client_fd); | |
0d34d6ce | 648 | buffer_free(&m); |
5e96b616 | 649 | return; |
650 | } | |
651 | ||
652 | if ((ver = buffer_get_char(&m)) != 0) { | |
653 | error("%s: wrong client version %d", __func__, ver); | |
654 | buffer_free(&m); | |
655 | close(client_fd); | |
656 | return; | |
657 | } | |
658 | ||
659 | cctx = xmalloc(sizeof(*cctx)); | |
660 | memset(cctx, 0, sizeof(*cctx)); | |
661 | ||
662 | cctx->want_tty = buffer_get_int(&m); | |
663 | cctx->want_subsys = buffer_get_int(&m); | |
664 | cctx->term = buffer_get_string(&m, &len); | |
665 | ||
666 | cmd = buffer_get_string(&m, &len); | |
667 | buffer_init(&cctx->cmd); | |
668 | buffer_append(&cctx->cmd, cmd, strlen(cmd)); | |
669 | ||
1786be35 | 670 | env_len = buffer_get_int(&m); |
671 | env_len = MIN(env_len, 4096); | |
672 | debug3("%s: receiving %d env vars", __func__, env_len); | |
673 | if (env_len != 0) { | |
674 | cctx->env = xmalloc(sizeof(*cctx->env) * (env_len + 1)); | |
675 | for (i = 0; i < env_len; i++) | |
676 | cctx->env[i] = buffer_get_string(&m, &len); | |
677 | cctx->env[i] = NULL; | |
678 | } | |
679 | ||
5e96b616 | 680 | debug2("%s: accepted tty %d, subsys %d, cmd %s", __func__, |
681 | cctx->want_tty, cctx->want_subsys, cmd); | |
682 | ||
683 | /* Gather fds from client */ | |
684 | new_fd[0] = mm_receive_fd(client_fd); | |
685 | new_fd[1] = mm_receive_fd(client_fd); | |
686 | new_fd[2] = mm_receive_fd(client_fd); | |
687 | ||
688 | debug2("%s: got fds stdin %d, stdout %d, stderr %d", __func__, | |
689 | new_fd[0], new_fd[1], new_fd[2]); | |
690 | ||
691 | /* Try to pick up ttymodes from client before it goes raw */ | |
692 | if (cctx->want_tty && tcgetattr(new_fd[0], &cctx->tio) == -1) | |
693 | error("%s: tcgetattr: %s", __func__, strerror(errno)); | |
694 | ||
695 | buffer_clear(&m); | |
696 | if (ssh_msg_send(client_fd, /* version */0, &m) == -1) { | |
697 | error("%s: client msg_send failed", __func__); | |
698 | close(client_fd); | |
699 | close(new_fd[0]); | |
700 | close(new_fd[1]); | |
701 | close(new_fd[2]); | |
0d34d6ce | 702 | buffer_free(&m); |
5e96b616 | 703 | return; |
704 | } | |
705 | buffer_free(&m); | |
706 | ||
707 | /* enable nonblocking unless tty */ | |
708 | if (!isatty(new_fd[0])) | |
709 | set_nonblock(new_fd[0]); | |
710 | if (!isatty(new_fd[1])) | |
711 | set_nonblock(new_fd[1]); | |
712 | if (!isatty(new_fd[2])) | |
713 | set_nonblock(new_fd[2]); | |
714 | ||
715 | set_nonblock(client_fd); | |
716 | ||
f2107e97 | 717 | c = channel_new("session", SSH_CHANNEL_OPENING, |
5e96b616 | 718 | new_fd[0], new_fd[1], new_fd[2], |
719 | CHAN_SES_WINDOW_DEFAULT, CHAN_SES_PACKET_DEFAULT, | |
720 | CHAN_EXTENDED_WRITE, "client-session", /*nonblock*/0); | |
721 | ||
722 | /* XXX */ | |
723 | c->ctl_fd = client_fd; | |
724 | ||
725 | debug3("%s: channel_new: %d", __func__, c->self); | |
726 | ||
727 | channel_send_open(c->self); | |
728 | channel_register_confirm(c->self, client_extra_session2_setup, cctx); | |
729 | } | |
730 | ||
c53c54c2 | 731 | static void |
ec9b7086 | 732 | process_cmdline(void) |
c53c54c2 | 733 | { |
c53c54c2 | 734 | void (*handler)(int); |
735 | char *s, *cmd; | |
736 | u_short fwd_port, fwd_host_port; | |
737 | char buf[1024], sfwd_port[6], sfwd_host_port[6]; | |
d740ec16 | 738 | int delete = 0; |
c53c54c2 | 739 | int local = 0; |
c53c54c2 | 740 | |
741 | leave_raw_mode(); | |
875ec275 | 742 | handler = signal(SIGINT, SIG_IGN); |
ec9b7086 | 743 | cmd = s = read_passphrase("\r\nssh> ", RP_ECHO); |
c53c54c2 | 744 | if (s == NULL) |
745 | goto out; | |
c53c54c2 | 746 | while (*s && isspace(*s)) |
747 | s++; | |
d740ec16 | 748 | if (*s == '-') |
749 | s++; /* Skip cmdline '-', if any */ | |
27c6fcae | 750 | if (*s == '\0') |
c53c54c2 | 751 | goto out; |
d740ec16 | 752 | |
7069a5e2 | 753 | if (*s == 'h' || *s == 'H' || *s == '?') { |
d740ec16 | 754 | logit("Commands:"); |
755 | logit(" -Lport:host:hostport Request local forward"); | |
756 | logit(" -Rport:host:hostport Request remote forward"); | |
757 | logit(" -KRhostport Cancel remote forward"); | |
758 | goto out; | |
759 | } | |
760 | ||
761 | if (*s == 'K') { | |
762 | delete = 1; | |
763 | s++; | |
764 | } | |
765 | if (*s != 'L' && *s != 'R') { | |
bbe88b6d | 766 | logit("Invalid command."); |
c53c54c2 | 767 | goto out; |
768 | } | |
d740ec16 | 769 | if (*s == 'L') |
c53c54c2 | 770 | local = 1; |
d740ec16 | 771 | if (local && delete) { |
772 | logit("Not supported."); | |
773 | goto out; | |
774 | } | |
775 | if ((!local || delete) && !compat20) { | |
bbe88b6d | 776 | logit("Not supported for SSH protocol version 1."); |
c53c54c2 | 777 | goto out; |
778 | } | |
d740ec16 | 779 | |
780 | s++; | |
c53c54c2 | 781 | while (*s && isspace(*s)) |
782 | s++; | |
783 | ||
d740ec16 | 784 | if (delete) { |
785 | if (sscanf(s, "%5[0-9]", sfwd_host_port) != 1) { | |
786 | logit("Bad forwarding specification."); | |
787 | goto out; | |
788 | } | |
789 | if ((fwd_host_port = a2port(sfwd_host_port)) == 0) { | |
790 | logit("Bad forwarding port(s)."); | |
c53c54c2 | 791 | goto out; |
792 | } | |
d740ec16 | 793 | channel_request_rforward_cancel(fwd_host_port); |
794 | } else { | |
795 | if (sscanf(s, "%5[0-9]:%255[^:]:%5[0-9]", | |
796 | sfwd_port, buf, sfwd_host_port) != 3 && | |
797 | sscanf(s, "%5[0-9]/%255[^/]/%5[0-9]", | |
798 | sfwd_port, buf, sfwd_host_port) != 3) { | |
799 | logit("Bad forwarding specification."); | |
800 | goto out; | |
801 | } | |
802 | if ((fwd_port = a2port(sfwd_port)) == 0 || | |
803 | (fwd_host_port = a2port(sfwd_host_port)) == 0) { | |
804 | logit("Bad forwarding port(s)."); | |
805 | goto out; | |
806 | } | |
807 | if (local) { | |
808 | if (channel_setup_local_fwd_listener(fwd_port, buf, | |
809 | fwd_host_port, options.gateway_ports) < 0) { | |
810 | logit("Port forwarding failed."); | |
811 | goto out; | |
812 | } | |
813 | } else | |
814 | channel_request_remote_forwarding(fwd_port, buf, | |
815 | fwd_host_port); | |
816 | logit("Forwarding port."); | |
817 | } | |
818 | ||
c53c54c2 | 819 | out: |
820 | signal(SIGINT, handler); | |
821 | enter_raw_mode(); | |
822 | if (cmd) | |
823 | xfree(cmd); | |
824 | } | |
825 | ||
2e73a022 | 826 | /* process the characters one by one */ |
396c147e | 827 | static int |
2e73a022 | 828 | process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len) |
829 | { | |
830 | char string[1024]; | |
831 | pid_t pid; | |
832 | int bytes = 0; | |
1e3b8b07 | 833 | u_int i; |
834 | u_char ch; | |
2e73a022 | 835 | char *s; |
836 | ||
837 | for (i = 0; i < len; i++) { | |
838 | /* Get one character at a time. */ | |
839 | ch = buf[i]; | |
840 | ||
841 | if (escape_pending) { | |
842 | /* We have previously seen an escape character. */ | |
843 | /* Clear the flag now. */ | |
844 | escape_pending = 0; | |
845 | ||
846 | /* Process the escaped character. */ | |
847 | switch (ch) { | |
848 | case '.': | |
849 | /* Terminate the connection. */ | |
850 | snprintf(string, sizeof string, "%c.\r\n", escape_char); | |
851 | buffer_append(berr, string, strlen(string)); | |
2e73a022 | 852 | |
853 | quit_pending = 1; | |
854 | return -1; | |
855 | ||
856 | case 'Z' - 64: | |
857 | /* Suspend the program. */ | |
858 | /* Print a message to that effect to the user. */ | |
859 | snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char); | |
860 | buffer_append(berr, string, strlen(string)); | |
2e73a022 | 861 | |
862 | /* Restore terminal modes and suspend. */ | |
863 | client_suspend_self(bin, bout, berr); | |
864 | ||
865 | /* We have been continued. */ | |
866 | continue; | |
867 | ||
16a79097 | 868 | case 'B': |
869 | if (compat20) { | |
870 | snprintf(string, sizeof string, | |
871 | "%cB\r\n", escape_char); | |
872 | buffer_append(berr, string, | |
873 | strlen(string)); | |
874 | channel_request_start(session_ident, | |
875 | "break", 0); | |
876 | packet_put_int(1000); | |
877 | packet_send(); | |
878 | } | |
879 | continue; | |
880 | ||
e092ce67 | 881 | case 'R': |
54506d2e | 882 | if (compat20) { |
883 | if (datafellows & SSH_BUG_NOREKEY) | |
bbe88b6d | 884 | logit("Server does not support re-keying"); |
54506d2e | 885 | else |
886 | need_rekeying = 1; | |
887 | } | |
e092ce67 | 888 | continue; |
889 | ||
2e73a022 | 890 | case '&': |
2e73a022 | 891 | /* |
892 | * Detach the program (continue to serve connections, | |
893 | * but put in background and no more new connections). | |
894 | */ | |
2e73a022 | 895 | /* Restore tty modes. */ |
896 | leave_raw_mode(); | |
897 | ||
898 | /* Stop listening for new connections. */ | |
c6940381 | 899 | channel_stop_listening(); |
2e73a022 | 900 | |
c6940381 | 901 | snprintf(string, sizeof string, |
902 | "%c& [backgrounded]\n", escape_char); | |
903 | buffer_append(berr, string, strlen(string)); | |
2e73a022 | 904 | |
905 | /* Fork into background. */ | |
906 | pid = fork(); | |
907 | if (pid < 0) { | |
908 | error("fork: %.100s", strerror(errno)); | |
909 | continue; | |
910 | } | |
911 | if (pid != 0) { /* This is the parent. */ | |
912 | /* The parent just exits. */ | |
913 | exit(0); | |
914 | } | |
915 | /* The child continues serving connections. */ | |
c6940381 | 916 | if (compat20) { |
917 | buffer_append(bin, "\004", 1); | |
918 | /* fake EOF on stdin */ | |
919 | return -1; | |
920 | } else if (!stdin_eof) { | |
921 | /* | |
922 | * Sending SSH_CMSG_EOF alone does not always appear | |
923 | * to be enough. So we try to send an EOF character | |
924 | * first. | |
925 | */ | |
926 | packet_start(SSH_CMSG_STDIN_DATA); | |
927 | packet_put_string("\004", 1); | |
928 | packet_send(); | |
929 | /* Close stdin. */ | |
930 | stdin_eof = 1; | |
931 | if (buffer_len(bin) == 0) { | |
932 | packet_start(SSH_CMSG_EOF); | |
933 | packet_send(); | |
934 | } | |
935 | } | |
936 | continue; | |
2e73a022 | 937 | |
938 | case '?': | |
939 | snprintf(string, sizeof string, | |
940 | "%c?\r\n\ | |
941 | Supported escape sequences:\r\n\ | |
1d77f8cb | 942 | %c. - terminate connection\r\n\ |
16a79097 | 943 | %cB - send a BREAK to the remote system\r\n\ |
1d77f8cb | 944 | %cC - open a command line\r\n\ |
945 | %cR - Request rekey (SSH protocol 2 only)\r\n\ | |
946 | %c^Z - suspend ssh\r\n\ | |
947 | %c# - list forwarded connections\r\n\ | |
948 | %c& - background ssh (when waiting for connections to terminate)\r\n\ | |
949 | %c? - this message\r\n\ | |
950 | %c%c - send the escape character by typing it twice\r\n\ | |
2e73a022 | 951 | (Note that escapes are only recognized immediately after newline.)\r\n", |
1d77f8cb | 952 | escape_char, escape_char, escape_char, escape_char, |
953 | escape_char, escape_char, escape_char, escape_char, | |
16a79097 | 954 | escape_char, escape_char, escape_char); |
2e73a022 | 955 | buffer_append(berr, string, strlen(string)); |
956 | continue; | |
957 | ||
958 | case '#': | |
959 | snprintf(string, sizeof string, "%c#\r\n", escape_char); | |
960 | buffer_append(berr, string, strlen(string)); | |
961 | s = channel_open_message(); | |
962 | buffer_append(berr, s, strlen(s)); | |
963 | xfree(s); | |
964 | continue; | |
965 | ||
c53c54c2 | 966 | case 'C': |
ec9b7086 | 967 | process_cmdline(); |
c53c54c2 | 968 | continue; |
969 | ||
2e73a022 | 970 | default: |
971 | if (ch != escape_char) { | |
972 | buffer_put_char(bin, escape_char); | |
973 | bytes++; | |
974 | } | |
975 | /* Escaped characters fall through here */ | |
976 | break; | |
977 | } | |
978 | } else { | |
979 | /* | |
980 | * The previous character was not an escape char. Check if this | |
981 | * is an escape. | |
982 | */ | |
983 | if (last_was_cr && ch == escape_char) { | |
984 | /* It is. Set the flag and continue to next character. */ | |
985 | escape_pending = 1; | |
986 | continue; | |
987 | } | |
988 | } | |
989 | ||
990 | /* | |
991 | * Normal character. Record whether it was a newline, | |
992 | * and append it to the buffer. | |
993 | */ | |
994 | last_was_cr = (ch == '\r' || ch == '\n'); | |
995 | buffer_put_char(bin, ch); | |
996 | bytes++; | |
997 | } | |
998 | return bytes; | |
999 | } | |
1000 | ||
396c147e | 1001 | static void |
8ce64345 | 1002 | client_process_input(fd_set * readset) |
1003 | { | |
9da5c3c9 | 1004 | int len; |
2e73a022 | 1005 | char buf[8192]; |
8ce64345 | 1006 | |
5260325f | 1007 | /* Read input from stdin. */ |
1008 | if (FD_ISSET(fileno(stdin), readset)) { | |
1009 | /* Read as much as possible. */ | |
1010 | len = read(fileno(stdin), buf, sizeof(buf)); | |
cf6bc93c | 1011 | if (len < 0 && (errno == EAGAIN || errno == EINTR)) |
1012 | return; /* we'll try again later */ | |
5260325f | 1013 | if (len <= 0) { |
aa3378df | 1014 | /* |
1015 | * Received EOF or error. They are treated | |
1016 | * similarly, except that an error message is printed | |
1017 | * if it was an error condition. | |
1018 | */ | |
5260325f | 1019 | if (len < 0) { |
1020 | snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno)); | |
1021 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
5260325f | 1022 | } |
1023 | /* Mark that we have seen EOF. */ | |
1024 | stdin_eof = 1; | |
aa3378df | 1025 | /* |
1026 | * Send an EOF message to the server unless there is | |
1027 | * data in the buffer. If there is data in the | |
1028 | * buffer, no message will be sent now. Code | |
1029 | * elsewhere will send the EOF when the buffer | |
1030 | * becomes empty if stdin_eof is set. | |
1031 | */ | |
5260325f | 1032 | if (buffer_len(&stdin_buffer) == 0) { |
8efc0c15 | 1033 | packet_start(SSH_CMSG_EOF); |
1034 | packet_send(); | |
5260325f | 1035 | } |
4bf9c10e | 1036 | } else if (escape_char == SSH_ESCAPECHAR_NONE) { |
aa3378df | 1037 | /* |
1038 | * Normal successful read, and no escape character. | |
1039 | * Just append the data to buffer. | |
1040 | */ | |
5260325f | 1041 | buffer_append(&stdin_buffer, buf, len); |
5260325f | 1042 | } else { |
aa3378df | 1043 | /* |
1044 | * Normal, successful read. But we have an escape character | |
1045 | * and have to process the characters one by one. | |
1046 | */ | |
7e8911cd | 1047 | if (process_escapes(&stdin_buffer, &stdout_buffer, |
1048 | &stderr_buffer, buf, len) == -1) | |
2e73a022 | 1049 | return; |
5260325f | 1050 | } |
1051 | } | |
8efc0c15 | 1052 | } |
1053 | ||
396c147e | 1054 | static void |
5260325f | 1055 | client_process_output(fd_set * writeset) |
8efc0c15 | 1056 | { |
5260325f | 1057 | int len; |
1058 | char buf[100]; | |
1059 | ||
1060 | /* Write buffered output to stdout. */ | |
1061 | if (FD_ISSET(fileno(stdout), writeset)) { | |
1062 | /* Write as much data as possible. */ | |
1063 | len = write(fileno(stdout), buffer_ptr(&stdout_buffer), | |
a408af76 | 1064 | buffer_len(&stdout_buffer)); |
5260325f | 1065 | if (len <= 0) { |
cf6bc93c | 1066 | if (errno == EINTR || errno == EAGAIN) |
5260325f | 1067 | len = 0; |
1068 | else { | |
aa3378df | 1069 | /* |
1070 | * An error or EOF was encountered. Put an | |
1071 | * error message to stderr buffer. | |
1072 | */ | |
5260325f | 1073 | snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno)); |
1074 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
5260325f | 1075 | quit_pending = 1; |
1076 | return; | |
1077 | } | |
1078 | } | |
1079 | /* Consume printed data from the buffer. */ | |
1080 | buffer_consume(&stdout_buffer, len); | |
cd332296 | 1081 | stdout_bytes += len; |
5260325f | 1082 | } |
1083 | /* Write buffered output to stderr. */ | |
1084 | if (FD_ISSET(fileno(stderr), writeset)) { | |
1085 | /* Write as much data as possible. */ | |
1086 | len = write(fileno(stderr), buffer_ptr(&stderr_buffer), | |
a408af76 | 1087 | buffer_len(&stderr_buffer)); |
5260325f | 1088 | if (len <= 0) { |
cf6bc93c | 1089 | if (errno == EINTR || errno == EAGAIN) |
5260325f | 1090 | len = 0; |
1091 | else { | |
aa3378df | 1092 | /* EOF or error, but can't even print error message. */ |
5260325f | 1093 | quit_pending = 1; |
1094 | return; | |
1095 | } | |
1096 | } | |
1097 | /* Consume printed characters from the buffer. */ | |
1098 | buffer_consume(&stderr_buffer, len); | |
cd332296 | 1099 | stderr_bytes += len; |
8efc0c15 | 1100 | } |
8efc0c15 | 1101 | } |
1102 | ||
7368a6c8 | 1103 | /* |
1104 | * Get packets from the connection input buffer, and process them as long as | |
1105 | * there are packets available. | |
1106 | * | |
1107 | * Any unknown packets received during the actual | |
1108 | * session cause the session to terminate. This is | |
1109 | * intended to make debugging easier since no | |
1110 | * confirmations are sent. Any compatible protocol | |
1111 | * extensions must be negotiated during the | |
1112 | * preparatory phase. | |
1113 | */ | |
1114 | ||
396c147e | 1115 | static void |
5ca51e19 | 1116 | client_process_buffered_input_packets(void) |
7368a6c8 | 1117 | { |
e092ce67 | 1118 | dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL); |
7368a6c8 | 1119 | } |
1120 | ||
2e73a022 | 1121 | /* scan buf[] for '~' before sending data to the peer */ |
1122 | ||
396c147e | 1123 | static int |
2e73a022 | 1124 | simple_escape_filter(Channel *c, char *buf, int len) |
1125 | { | |
1126 | /* XXX we assume c->extended is writeable */ | |
1127 | return process_escapes(&c->input, &c->output, &c->extended, buf, len); | |
1128 | } | |
1129 | ||
396c147e | 1130 | static void |
eb0dd41f | 1131 | client_channel_closed(int id, void *arg) |
1132 | { | |
418e724c | 1133 | channel_cancel_cleanup(id); |
eb0dd41f | 1134 | session_closed = 1; |
82de775c | 1135 | leave_raw_mode(); |
eb0dd41f | 1136 | } |
1137 | ||
aa3378df | 1138 | /* |
1139 | * Implements the interactive session with the server. This is called after | |
1140 | * the user has been authenticated, and a command has been started on the | |
4bf9c10e | 1141 | * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character |
1142 | * used as an escape character for terminating or suspending the session. | |
aa3378df | 1143 | */ |
8efc0c15 | 1144 | |
6ae2364d | 1145 | int |
2e73a022 | 1146 | client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id) |
8efc0c15 | 1147 | { |
39929cdb | 1148 | fd_set *readset = NULL, *writeset = NULL; |
5260325f | 1149 | double start_time, total_time; |
9a995072 | 1150 | int max_fd = 0, max_fd2 = 0, len, rekeying = 0; |
1151 | u_int nalloc = 0; | |
5260325f | 1152 | char buf[100]; |
1153 | ||
1154 | debug("Entering interactive session."); | |
1155 | ||
1156 | start_time = get_current_time(); | |
1157 | ||
1158 | /* Initialize variables. */ | |
1159 | escape_pending = 0; | |
1160 | last_was_cr = 1; | |
1161 | exit_status = -1; | |
1162 | stdin_eof = 0; | |
1163 | buffer_high = 64 * 1024; | |
1164 | connection_in = packet_get_connection_in(); | |
1165 | connection_out = packet_get_connection_out(); | |
39929cdb | 1166 | max_fd = MAX(connection_in, connection_out); |
5e96b616 | 1167 | if (control_fd != -1) |
1168 | max_fd = MAX(max_fd, control_fd); | |
39929cdb | 1169 | |
1170 | if (!compat20) { | |
e968270c | 1171 | /* enable nonblocking unless tty */ |
1172 | if (!isatty(fileno(stdin))) | |
1173 | set_nonblock(fileno(stdin)); | |
1174 | if (!isatty(fileno(stdout))) | |
1175 | set_nonblock(fileno(stdout)); | |
1176 | if (!isatty(fileno(stderr))) | |
1177 | set_nonblock(fileno(stderr)); | |
39929cdb | 1178 | max_fd = MAX(max_fd, fileno(stdin)); |
1179 | max_fd = MAX(max_fd, fileno(stdout)); | |
1180 | max_fd = MAX(max_fd, fileno(stderr)); | |
1181 | } | |
5260325f | 1182 | stdin_bytes = 0; |
1183 | stdout_bytes = 0; | |
1184 | stderr_bytes = 0; | |
1185 | quit_pending = 0; | |
1186 | escape_char = escape_char_arg; | |
1187 | ||
1188 | /* Initialize buffers. */ | |
1189 | buffer_init(&stdin_buffer); | |
1190 | buffer_init(&stdout_buffer); | |
1191 | buffer_init(&stderr_buffer); | |
1192 | ||
7368a6c8 | 1193 | client_init_dispatch(); |
1194 | ||
3c93c917 | 1195 | /* |
1196 | * Set signal handlers, (e.g. to restore non-blocking mode) | |
1197 | * but don't overwrite SIG_IGN, matches behaviour from rsh(1) | |
1198 | */ | |
1199 | if (signal(SIGINT, SIG_IGN) != SIG_IGN) | |
1200 | signal(SIGINT, signal_handler); | |
1201 | if (signal(SIGQUIT, SIG_IGN) != SIG_IGN) | |
1202 | signal(SIGQUIT, signal_handler); | |
1203 | if (signal(SIGTERM, SIG_IGN) != SIG_IGN) | |
1204 | signal(SIGTERM, signal_handler); | |
5260325f | 1205 | if (have_pty) |
1206 | signal(SIGWINCH, window_change_handler); | |
1207 | ||
5260325f | 1208 | if (have_pty) |
1209 | enter_raw_mode(); | |
1210 | ||
1fc8ccdf | 1211 | if (compat20) { |
1212 | session_ident = ssh2_chan_id; | |
4bf9c10e | 1213 | if (escape_char != SSH_ESCAPECHAR_NONE) |
1fc8ccdf | 1214 | channel_register_filter(session_ident, |
1215 | simple_escape_filter); | |
eb0dd41f | 1216 | if (session_ident != -1) |
1217 | channel_register_cleanup(session_ident, | |
1218 | client_channel_closed); | |
1fc8ccdf | 1219 | } else { |
1220 | /* Check if we should immediately send eof on stdin. */ | |
8ce64345 | 1221 | client_check_initial_eof_on_stdin(); |
1fc8ccdf | 1222 | } |
2e73a022 | 1223 | |
5260325f | 1224 | /* Main loop of the client for the interactive session mode. */ |
1225 | while (!quit_pending) { | |
5260325f | 1226 | |
aa3378df | 1227 | /* Process buffered packets sent by the server. */ |
5260325f | 1228 | client_process_buffered_input_packets(); |
1229 | ||
eb0dd41f | 1230 | if (compat20 && session_closed && !channel_still_open()) |
8ce64345 | 1231 | break; |
eb0dd41f | 1232 | |
1233 | rekeying = (xxx_kex != NULL && !xxx_kex->done); | |
8ce64345 | 1234 | |
c422989b | 1235 | if (rekeying) { |
1236 | debug("rekeying in progress"); | |
1237 | } else { | |
1238 | /* | |
1239 | * Make packets of buffered stdin data, and buffer | |
1240 | * them for sending to the server. | |
1241 | */ | |
1242 | if (!compat20) | |
1243 | client_make_packets_from_stdin_data(); | |
5260325f | 1244 | |
c422989b | 1245 | /* |
1246 | * Make packets from buffered channel data, and | |
1247 | * enqueue them for sending to the server. | |
1248 | */ | |
1249 | if (packet_not_very_much_data_to_write()) | |
1250 | channel_output_poll(); | |
5260325f | 1251 | |
c422989b | 1252 | /* |
1253 | * Check if the window size has changed, and buffer a | |
1254 | * message about it to the server if so. | |
1255 | */ | |
1256 | client_check_window_change(); | |
5260325f | 1257 | |
c422989b | 1258 | if (quit_pending) |
1259 | break; | |
1260 | } | |
aa3378df | 1261 | /* |
1262 | * Wait until we have something to do (something becomes | |
1263 | * available on one of the descriptors). | |
1264 | */ | |
489aa2e9 | 1265 | max_fd2 = max_fd; |
c422989b | 1266 | client_wait_until_can_do_something(&readset, &writeset, |
489aa2e9 | 1267 | &max_fd2, &nalloc, rekeying); |
5260325f | 1268 | |
1269 | if (quit_pending) | |
1270 | break; | |
1271 | ||
c422989b | 1272 | /* Do channel operations unless rekeying in progress. */ |
1273 | if (!rekeying) { | |
1274 | channel_after_select(readset, writeset); | |
ffd7b36b | 1275 | if (need_rekeying || packet_need_rekeying()) { |
1276 | debug("need rekeying"); | |
c422989b | 1277 | xxx_kex->done = 0; |
1278 | kex_send_kexinit(xxx_kex); | |
1279 | need_rekeying = 0; | |
1280 | } | |
1281 | } | |
5260325f | 1282 | |
8ce64345 | 1283 | /* Buffer input from the connection. */ |
39929cdb | 1284 | client_process_net_input(readset); |
5260325f | 1285 | |
5e96b616 | 1286 | /* Accept control connections. */ |
1287 | client_process_control(readset); | |
1288 | ||
8ce64345 | 1289 | if (quit_pending) |
1290 | break; | |
1291 | ||
1292 | if (!compat20) { | |
1293 | /* Buffer data from stdin */ | |
39929cdb | 1294 | client_process_input(readset); |
8ce64345 | 1295 | /* |
1296 | * Process output to stdout and stderr. Output to | |
1297 | * the connection is processed elsewhere (above). | |
1298 | */ | |
39929cdb | 1299 | client_process_output(writeset); |
8ce64345 | 1300 | } |
5260325f | 1301 | |
aa3378df | 1302 | /* Send as much buffered packet data as possible to the sender. */ |
39929cdb | 1303 | if (FD_ISSET(connection_out, writeset)) |
5260325f | 1304 | packet_write_poll(); |
1305 | } | |
39929cdb | 1306 | if (readset) |
1307 | xfree(readset); | |
1308 | if (writeset) | |
1309 | xfree(writeset); | |
5260325f | 1310 | |
1311 | /* Terminate the session. */ | |
1312 | ||
1313 | /* Stop watching for window change. */ | |
1314 | if (have_pty) | |
1315 | signal(SIGWINCH, SIG_DFL); | |
1316 | ||
d6746a0b | 1317 | channel_free_all(); |
5260325f | 1318 | |
c9130033 | 1319 | if (have_pty) |
1320 | leave_raw_mode(); | |
89aa792b | 1321 | |
1322 | /* restore blocking io */ | |
1323 | if (!isatty(fileno(stdin))) | |
1324 | unset_nonblock(fileno(stdin)); | |
1325 | if (!isatty(fileno(stdout))) | |
1326 | unset_nonblock(fileno(stdout)); | |
1327 | if (!isatty(fileno(stderr))) | |
1328 | unset_nonblock(fileno(stderr)); | |
1329 | ||
66357af5 | 1330 | /* |
1331 | * If there was no shell or command requested, there will be no remote | |
1332 | * exit status to be returned. In that case, clear error code if the | |
1333 | * connection was deliberately terminated at this end. | |
1334 | */ | |
1335 | if (no_shell_flag && received_signal == SIGTERM) { | |
1336 | received_signal = 0; | |
1337 | exit_status = 0; | |
1338 | } | |
1339 | ||
82de775c | 1340 | if (received_signal) |
010f9726 | 1341 | fatal("Killed by signal %d.", (int) received_signal); |
c9130033 | 1342 | |
1343 | /* | |
1344 | * In interactive mode (with pseudo tty) display a message indicating | |
1345 | * that the connection has been closed. | |
1346 | */ | |
1347 | if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) { | |
1348 | snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host); | |
1349 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
1350 | } | |
1351 | ||
5260325f | 1352 | /* Output any buffered data for stdout. */ |
89aa792b | 1353 | while (buffer_len(&stdout_buffer) > 0) { |
1354 | len = write(fileno(stdout), buffer_ptr(&stdout_buffer), | |
a408af76 | 1355 | buffer_len(&stdout_buffer)); |
89aa792b | 1356 | if (len <= 0) { |
5260325f | 1357 | error("Write failed flushing stdout buffer."); |
89aa792b | 1358 | break; |
1359 | } | |
5260325f | 1360 | buffer_consume(&stdout_buffer, len); |
cd332296 | 1361 | stdout_bytes += len; |
8efc0c15 | 1362 | } |
5260325f | 1363 | |
1364 | /* Output any buffered data for stderr. */ | |
89aa792b | 1365 | while (buffer_len(&stderr_buffer) > 0) { |
1366 | len = write(fileno(stderr), buffer_ptr(&stderr_buffer), | |
a408af76 | 1367 | buffer_len(&stderr_buffer)); |
89aa792b | 1368 | if (len <= 0) { |
5260325f | 1369 | error("Write failed flushing stderr buffer."); |
89aa792b | 1370 | break; |
1371 | } | |
5260325f | 1372 | buffer_consume(&stderr_buffer, len); |
cd332296 | 1373 | stderr_bytes += len; |
5260325f | 1374 | } |
1375 | ||
5260325f | 1376 | /* Clear and free any buffers. */ |
1377 | memset(buf, 0, sizeof(buf)); | |
1378 | buffer_free(&stdin_buffer); | |
1379 | buffer_free(&stdout_buffer); | |
1380 | buffer_free(&stderr_buffer); | |
1381 | ||
1382 | /* Report bytes transferred, and transfer rates. */ | |
1383 | total_time = get_current_time() - start_time; | |
1384 | debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds", | |
184eed6a | 1385 | stdin_bytes, stdout_bytes, stderr_bytes, total_time); |
5260325f | 1386 | if (total_time > 0) |
1387 | debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f", | |
184eed6a | 1388 | stdin_bytes / total_time, stdout_bytes / total_time, |
1389 | stderr_bytes / total_time); | |
5260325f | 1390 | |
1391 | /* Return the exit status of the program. */ | |
1392 | debug("Exit status %d", exit_status); | |
1393 | return exit_status; | |
8efc0c15 | 1394 | } |
7368a6c8 | 1395 | |
1396 | /*********/ | |
1397 | ||
396c147e | 1398 | static void |
7819b5c3 | 1399 | client_input_stdout_data(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 1400 | { |
1e3b8b07 | 1401 | u_int data_len; |
7368a6c8 | 1402 | char *data = packet_get_string(&data_len); |
95500969 | 1403 | packet_check_eom(); |
7368a6c8 | 1404 | buffer_append(&stdout_buffer, data, data_len); |
7368a6c8 | 1405 | memset(data, 0, data_len); |
1406 | xfree(data); | |
1407 | } | |
396c147e | 1408 | static void |
7819b5c3 | 1409 | client_input_stderr_data(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 1410 | { |
1e3b8b07 | 1411 | u_int data_len; |
7368a6c8 | 1412 | char *data = packet_get_string(&data_len); |
95500969 | 1413 | packet_check_eom(); |
7368a6c8 | 1414 | buffer_append(&stderr_buffer, data, data_len); |
7368a6c8 | 1415 | memset(data, 0, data_len); |
1416 | xfree(data); | |
1417 | } | |
396c147e | 1418 | static void |
7819b5c3 | 1419 | client_input_exit_status(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 1420 | { |
7368a6c8 | 1421 | exit_status = packet_get_int(); |
95500969 | 1422 | packet_check_eom(); |
7368a6c8 | 1423 | /* Acknowledge the exit. */ |
1424 | packet_start(SSH_CMSG_EXIT_CONFIRMATION); | |
1425 | packet_send(); | |
1426 | /* | |
1427 | * Must wait for packet to be sent since we are | |
1428 | * exiting the loop. | |
1429 | */ | |
1430 | packet_write_wait(); | |
1431 | /* Flag that we want to exit. */ | |
1432 | quit_pending = 1; | |
1433 | } | |
c15706e2 | 1434 | static void |
1435 | client_input_agent_open(int type, u_int32_t seq, void *ctxt) | |
1436 | { | |
1437 | Channel *c = NULL; | |
1438 | int remote_id, sock; | |
1439 | ||
1440 | /* Read the remote channel number from the message. */ | |
1441 | remote_id = packet_get_int(); | |
1442 | packet_check_eom(); | |
1443 | ||
1444 | /* | |
1445 | * Get a connection to the local authentication agent (this may again | |
1446 | * get forwarded). | |
1447 | */ | |
1448 | sock = ssh_get_authentication_socket(); | |
1449 | ||
1450 | /* | |
1451 | * If we could not connect the agent, send an error message back to | |
1452 | * the server. This should never happen unless the agent dies, | |
1453 | * because authentication forwarding is only enabled if we have an | |
1454 | * agent. | |
1455 | */ | |
1456 | if (sock >= 0) { | |
1457 | c = channel_new("", SSH_CHANNEL_OPEN, sock, sock, | |
1458 | -1, 0, 0, 0, "authentication agent connection", 1); | |
1459 | c->remote_id = remote_id; | |
1460 | c->force_drain = 1; | |
1461 | } | |
1462 | if (c == NULL) { | |
1463 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
1464 | packet_put_int(remote_id); | |
1465 | } else { | |
1466 | /* Send a confirmation to the remote host. */ | |
1467 | debug("Forwarding authentication connection."); | |
1468 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1469 | packet_put_int(remote_id); | |
1470 | packet_put_int(c->self); | |
1471 | } | |
1472 | packet_send(); | |
1473 | } | |
7368a6c8 | 1474 | |
396c147e | 1475 | static Channel * |
fa08c86b | 1476 | client_request_forwarded_tcpip(const char *request_type, int rchan) |
1477 | { | |
343288b8 | 1478 | Channel *c = NULL; |
fa08c86b | 1479 | char *listen_address, *originator_address; |
1480 | int listen_port, originator_port; | |
719fc62f | 1481 | int sock; |
fa08c86b | 1482 | |
1483 | /* Get rest of the packet */ | |
1484 | listen_address = packet_get_string(NULL); | |
1485 | listen_port = packet_get_int(); | |
1486 | originator_address = packet_get_string(NULL); | |
1487 | originator_port = packet_get_int(); | |
95500969 | 1488 | packet_check_eom(); |
fa08c86b | 1489 | |
1490 | debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d", | |
1491 | listen_address, listen_port, originator_address, originator_port); | |
1492 | ||
b3f8a79c | 1493 | sock = channel_connect_by_listen_address(listen_port); |
719fc62f | 1494 | if (sock < 0) { |
1495 | xfree(originator_address); | |
1496 | xfree(listen_address); | |
1497 | return NULL; | |
1498 | } | |
1499 | c = channel_new("forwarded-tcpip", | |
1500 | SSH_CHANNEL_CONNECTING, sock, sock, -1, | |
1501 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0, | |
0d942eff | 1502 | originator_address, 1); |
fa08c86b | 1503 | xfree(originator_address); |
1504 | xfree(listen_address); | |
1505 | return c; | |
1506 | } | |
1507 | ||
343288b8 | 1508 | static Channel * |
fa08c86b | 1509 | client_request_x11(const char *request_type, int rchan) |
1510 | { | |
1511 | Channel *c = NULL; | |
1512 | char *originator; | |
1513 | int originator_port; | |
719fc62f | 1514 | int sock; |
fa08c86b | 1515 | |
1516 | if (!options.forward_x11) { | |
1517 | error("Warning: ssh server tried X11 forwarding."); | |
1518 | error("Warning: this is probably a break in attempt by a malicious server."); | |
1519 | return NULL; | |
1520 | } | |
1521 | originator = packet_get_string(NULL); | |
1522 | if (datafellows & SSH_BUG_X11FWD) { | |
1523 | debug2("buggy server: x11 request w/o originator_port"); | |
1524 | originator_port = 0; | |
1525 | } else { | |
1526 | originator_port = packet_get_int(); | |
1527 | } | |
95500969 | 1528 | packet_check_eom(); |
fa08c86b | 1529 | /* XXX check permission */ |
865ac82e | 1530 | debug("client_request_x11: request from %s %d", originator, |
1531 | originator_port); | |
719fc62f | 1532 | xfree(originator); |
fa08c86b | 1533 | sock = x11_connect_display(); |
719fc62f | 1534 | if (sock < 0) |
1535 | return NULL; | |
1536 | c = channel_new("x11", | |
1537 | SSH_CHANNEL_X11_OPEN, sock, sock, -1, | |
0d942eff | 1538 | CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1); |
a5f82435 | 1539 | c->force_drain = 1; |
fa08c86b | 1540 | return c; |
1541 | } | |
1542 | ||
343288b8 | 1543 | static Channel * |
fa08c86b | 1544 | client_request_agent(const char *request_type, int rchan) |
1545 | { | |
1546 | Channel *c = NULL; | |
719fc62f | 1547 | int sock; |
fa08c86b | 1548 | |
1549 | if (!options.forward_agent) { | |
1550 | error("Warning: ssh server tried agent forwarding."); | |
1551 | error("Warning: this is probably a break in attempt by a malicious server."); | |
1552 | return NULL; | |
1553 | } | |
1554 | sock = ssh_get_authentication_socket(); | |
719fc62f | 1555 | if (sock < 0) |
1556 | return NULL; | |
1557 | c = channel_new("authentication agent connection", | |
1558 | SSH_CHANNEL_OPEN, sock, sock, -1, | |
1559 | CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0, | |
0d942eff | 1560 | "authentication agent connection", 1); |
a5f82435 | 1561 | c->force_drain = 1; |
fa08c86b | 1562 | return c; |
1563 | } | |
1564 | ||
0b242b12 | 1565 | /* XXXX move to generic input handler */ |
396c147e | 1566 | static void |
7819b5c3 | 1567 | client_input_channel_open(int type, u_int32_t seq, void *ctxt) |
0b242b12 | 1568 | { |
1569 | Channel *c = NULL; | |
1570 | char *ctype; | |
0b242b12 | 1571 | int rchan; |
f91d9a89 | 1572 | u_int rmaxpack, rwindow, len; |
0b242b12 | 1573 | |
1574 | ctype = packet_get_string(&len); | |
1575 | rchan = packet_get_int(); | |
1576 | rwindow = packet_get_int(); | |
1577 | rmaxpack = packet_get_int(); | |
1578 | ||
1d1ffb87 | 1579 | debug("client_input_channel_open: ctype %s rchan %d win %d max %d", |
0b242b12 | 1580 | ctype, rchan, rwindow, rmaxpack); |
1581 | ||
fa08c86b | 1582 | if (strcmp(ctype, "forwarded-tcpip") == 0) { |
1583 | c = client_request_forwarded_tcpip(ctype, rchan); | |
1584 | } else if (strcmp(ctype, "x11") == 0) { | |
1585 | c = client_request_x11(ctype, rchan); | |
1586 | } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) { | |
1587 | c = client_request_agent(ctype, rchan); | |
0b242b12 | 1588 | } |
1589 | /* XXX duplicate : */ | |
1590 | if (c != NULL) { | |
1591 | debug("confirm %s", ctype); | |
1592 | c->remote_id = rchan; | |
1593 | c->remote_window = rwindow; | |
1594 | c->remote_maxpacket = rmaxpack; | |
a01a10dd | 1595 | if (c->type != SSH_CHANNEL_CONNECTING) { |
1596 | packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1597 | packet_put_int(c->remote_id); | |
1598 | packet_put_int(c->self); | |
1599 | packet_put_int(c->local_window); | |
1600 | packet_put_int(c->local_maxpacket); | |
1601 | packet_send(); | |
1602 | } | |
0b242b12 | 1603 | } else { |
1604 | debug("failure %s", ctype); | |
1605 | packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); | |
1606 | packet_put_int(rchan); | |
1607 | packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED); | |
fbe90f7b | 1608 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { |
a01a10dd | 1609 | packet_put_cstring("open failed"); |
fbe90f7b | 1610 | packet_put_cstring(""); |
1611 | } | |
0b242b12 | 1612 | packet_send(); |
1613 | } | |
1614 | xfree(ctype); | |
1615 | } | |
396c147e | 1616 | static void |
7819b5c3 | 1617 | client_input_channel_req(int type, u_int32_t seq, void *ctxt) |
1fc8ccdf | 1618 | { |
1619 | Channel *c = NULL; | |
5e96b616 | 1620 | int exitval, id, reply, success = 0; |
1fc8ccdf | 1621 | char *rtype; |
1622 | ||
1623 | id = packet_get_int(); | |
1624 | rtype = packet_get_string(NULL); | |
1625 | reply = packet_get_char(); | |
1626 | ||
1627 | debug("client_input_channel_req: channel %d rtype %s reply %d", | |
1628 | id, rtype, reply); | |
1629 | ||
13de3560 | 1630 | if (id == -1) { |
1631 | error("client_input_channel_req: request for channel -1"); | |
1632 | } else if ((c = channel_lookup(id)) == NULL) { | |
1fc8ccdf | 1633 | error("client_input_channel_req: channel %d: unknown channel", id); |
1634 | } else if (strcmp(rtype, "exit-status") == 0) { | |
5e96b616 | 1635 | exitval = packet_get_int(); |
1636 | if (id == session_ident) { | |
1637 | success = 1; | |
1638 | exit_status = exitval; | |
1639 | } else if (c->ctl_fd == -1) { | |
1640 | error("client_input_channel_req: unexpected channel %d", | |
1641 | session_ident); | |
1642 | } else { | |
1643 | atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval)); | |
1644 | success = 1; | |
1645 | } | |
95500969 | 1646 | packet_check_eom(); |
1fc8ccdf | 1647 | } |
1648 | if (reply) { | |
1649 | packet_start(success ? | |
1650 | SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE); | |
13de3560 | 1651 | packet_put_int(id); |
1fc8ccdf | 1652 | packet_send(); |
1653 | } | |
1654 | xfree(rtype); | |
1655 | } | |
3d209bbe | 1656 | static void |
1657 | client_input_global_request(int type, u_int32_t seq, void *ctxt) | |
1658 | { | |
1659 | char *rtype; | |
1660 | int want_reply; | |
1661 | int success = 0; | |
1662 | ||
1663 | rtype = packet_get_string(NULL); | |
1664 | want_reply = packet_get_char(); | |
5d8d32a3 | 1665 | debug("client_input_global_request: rtype %s want_reply %d", |
1666 | rtype, want_reply); | |
3d209bbe | 1667 | if (want_reply) { |
1668 | packet_start(success ? | |
1669 | SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE); | |
1670 | packet_send(); | |
1671 | packet_write_wait(); | |
1672 | } | |
1673 | xfree(rtype); | |
1674 | } | |
0b242b12 | 1675 | |
5e96b616 | 1676 | void |
f2107e97 | 1677 | client_session2_setup(int id, int want_tty, int want_subsystem, |
1786be35 | 1678 | const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env, |
5e96b616 | 1679 | dispatch_fn *subsys_repl) |
1680 | { | |
1681 | int len; | |
1682 | ||
1683 | debug2("%s: id %d", __func__, id); | |
1684 | ||
1685 | if (want_tty) { | |
1686 | struct winsize ws; | |
1687 | struct termios tio; | |
1688 | ||
1689 | /* Store window size in the packet. */ | |
1690 | if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0) | |
1691 | memset(&ws, 0, sizeof(ws)); | |
1692 | ||
1693 | channel_request_start(id, "pty-req", 0); | |
1694 | packet_put_cstring(term != NULL ? term : ""); | |
1695 | packet_put_int(ws.ws_col); | |
1696 | packet_put_int(ws.ws_row); | |
1697 | packet_put_int(ws.ws_xpixel); | |
1698 | packet_put_int(ws.ws_ypixel); | |
1699 | tio = get_saved_tio(); | |
1700 | tty_make_modes(-1, tiop != NULL ? tiop : &tio); | |
1701 | packet_send(); | |
1702 | /* XXX wait for reply */ | |
1703 | } | |
1704 | ||
1705 | /* Transfer any environment variables from client to server */ | |
1786be35 | 1706 | if (options.num_send_env != 0 && env != NULL) { |
5e96b616 | 1707 | int i, j, matched; |
5e96b616 | 1708 | char *name, *val; |
1709 | ||
1710 | debug("Sending environment."); | |
1786be35 | 1711 | for (i = 0; env[i] != NULL; i++) { |
5e96b616 | 1712 | /* Split */ |
1786be35 | 1713 | name = xstrdup(env[i]); |
5e96b616 | 1714 | if ((val = strchr(name, '=')) == NULL) { |
1715 | free(name); | |
1716 | continue; | |
1717 | } | |
1718 | *val++ = '\0'; | |
1719 | ||
1720 | matched = 0; | |
1721 | for (j = 0; j < options.num_send_env; j++) { | |
1722 | if (match_pattern(name, options.send_env[j])) { | |
1723 | matched = 1; | |
1724 | break; | |
1725 | } | |
1726 | } | |
1727 | if (!matched) { | |
1728 | debug3("Ignored env %s", name); | |
1729 | free(name); | |
1730 | continue; | |
1731 | } | |
1732 | ||
1733 | debug("Sending env %s = %s", name, val); | |
1734 | channel_request_start(id, "env", 0); | |
1735 | packet_put_cstring(name); | |
1736 | packet_put_cstring(val); | |
1737 | packet_send(); | |
1738 | free(name); | |
1739 | } | |
1740 | } | |
1741 | ||
1742 | len = buffer_len(cmd); | |
1743 | if (len > 0) { | |
1744 | if (len > 900) | |
1745 | len = 900; | |
1746 | if (want_subsystem) { | |
1747 | debug("Sending subsystem: %.*s", len, (u_char*)buffer_ptr(cmd)); | |
1748 | channel_request_start(id, "subsystem", subsys_repl != NULL); | |
1749 | if (subsys_repl != NULL) { | |
1750 | /* register callback for reply */ | |
1751 | /* XXX we assume that client_loop has already been called */ | |
1752 | dispatch_set(SSH2_MSG_CHANNEL_FAILURE, subsys_repl); | |
1753 | dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, subsys_repl); | |
1754 | } | |
1755 | } else { | |
1756 | debug("Sending command: %.*s", len, (u_char*)buffer_ptr(cmd)); | |
1757 | channel_request_start(id, "exec", 0); | |
1758 | } | |
1759 | packet_put_string(buffer_ptr(cmd), buffer_len(cmd)); | |
1760 | packet_send(); | |
1761 | } else { | |
1762 | channel_request_start(id, "shell", 0); | |
1763 | packet_send(); | |
1764 | } | |
1765 | } | |
1766 | ||
396c147e | 1767 | static void |
5ca51e19 | 1768 | client_init_dispatch_20(void) |
8ce64345 | 1769 | { |
7a37c112 | 1770 | dispatch_init(&dispatch_protocol_error); |
e0ae8728 | 1771 | |
8ce64345 | 1772 | dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose); |
1773 | dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data); | |
1774 | dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof); | |
1775 | dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data); | |
0b242b12 | 1776 | dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open); |
8ce64345 | 1777 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); |
1778 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); | |
1fc8ccdf | 1779 | dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req); |
8ce64345 | 1780 | dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust); |
3d209bbe | 1781 | dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request); |
7a37c112 | 1782 | |
1783 | /* rekeying */ | |
1784 | dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit); | |
e0ae8728 | 1785 | |
1786 | /* global request reply messages */ | |
1787 | dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply); | |
1788 | dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply); | |
8ce64345 | 1789 | } |
396c147e | 1790 | static void |
5ca51e19 | 1791 | client_init_dispatch_13(void) |
7368a6c8 | 1792 | { |
1793 | dispatch_init(NULL); | |
1794 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close); | |
1795 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation); | |
1796 | dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data); | |
7368a6c8 | 1797 | dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); |
1798 | dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); | |
1799 | dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open); | |
7368a6c8 | 1800 | dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status); |
1801 | dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data); | |
1802 | dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data); | |
a22aff1f | 1803 | |
1804 | dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ? | |
c15706e2 | 1805 | &client_input_agent_open : &deny_input_open); |
a22aff1f | 1806 | dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ? |
1807 | &x11_input_open : &deny_input_open); | |
7368a6c8 | 1808 | } |
396c147e | 1809 | static void |
5ca51e19 | 1810 | client_init_dispatch_15(void) |
7368a6c8 | 1811 | { |
1812 | client_init_dispatch_13(); | |
1813 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof); | |
1814 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose); | |
1815 | } | |
eea46d13 | 1816 | static void |
5ca51e19 | 1817 | client_init_dispatch(void) |
7368a6c8 | 1818 | { |
8ce64345 | 1819 | if (compat20) |
1820 | client_init_dispatch_20(); | |
1821 | else if (compat13) | |
7368a6c8 | 1822 | client_init_dispatch_13(); |
1823 | else | |
1824 | client_init_dispatch_15(); | |
1825 | } | |
82de775c | 1826 | |
1827 | /* client specific fatal cleanup */ | |
1828 | void | |
2362db19 | 1829 | cleanup_exit(int i) |
82de775c | 1830 | { |
82de775c | 1831 | leave_raw_mode(); |
1832 | leave_non_blocking(); | |
5e96b616 | 1833 | if (options.control_path != NULL && control_fd != -1) |
1834 | unlink(options.control_path); | |
2362db19 | 1835 | _exit(i); |
82de775c | 1836 | } |