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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" | |
9bf083eb | 62 | RCSID("$OpenBSD: clientloop.c,v 1.138 2005/06/16 03:38:36 djm Exp $"); |
8efc0c15 | 63 | |
8efc0c15 | 64 | #include "ssh.h" |
42f11eb2 | 65 | #include "ssh1.h" |
66 | #include "ssh2.h" | |
67 | #include "xmalloc.h" | |
8efc0c15 | 68 | #include "packet.h" |
69 | #include "buffer.h" | |
7368a6c8 | 70 | #include "compat.h" |
a5efa1bb | 71 | #include "channels.h" |
7368a6c8 | 72 | #include "dispatch.h" |
2e73a022 | 73 | #include "buffer.h" |
74 | #include "bufaux.h" | |
fa08c86b | 75 | #include "key.h" |
e092ce67 | 76 | #include "kex.h" |
42f11eb2 | 77 | #include "log.h" |
78 | #include "readconf.h" | |
b5c334cc | 79 | #include "clientloop.h" |
42f11eb2 | 80 | #include "authfd.h" |
81 | #include "atomicio.h" | |
07d80252 | 82 | #include "sshpty.h" |
e968270c | 83 | #include "misc.h" |
5e96b616 | 84 | #include "monitor_fdpass.h" |
85 | #include "match.h" | |
86 | #include "msg.h" | |
a22aff1f | 87 | |
88 | /* import options */ | |
89 | extern Options options; | |
90 | ||
8efc0c15 | 91 | /* Flag indicating that stdin should be redirected from /dev/null. */ |
92 | extern int stdin_null_flag; | |
93 | ||
66357af5 | 94 | /* Flag indicating that no shell has been requested */ |
95 | extern int no_shell_flag; | |
96 | ||
5e96b616 | 97 | /* Control socket */ |
98 | extern int control_fd; | |
99 | ||
aa3378df | 100 | /* |
101 | * Name of the host we are connecting to. This is the name given on the | |
102 | * command line, or the HostName specified for the user-supplied name in a | |
103 | * configuration file. | |
104 | */ | |
8efc0c15 | 105 | extern char *host; |
106 | ||
aa3378df | 107 | /* |
108 | * Flag to indicate that we have received a window change signal which has | |
109 | * not yet been processed. This will cause a message indicating the new | |
110 | * window size to be sent to the server a little later. This is volatile | |
111 | * because this is updated in a signal handler. | |
112 | */ | |
7a934d1b | 113 | static volatile sig_atomic_t received_window_change_signal = 0; |
114 | static volatile sig_atomic_t received_signal = 0; | |
8efc0c15 | 115 | |
8efc0c15 | 116 | /* Flag indicating whether the user\'s terminal is in non-blocking mode. */ |
117 | static int in_non_blocking_mode = 0; | |
118 | ||
119 | /* Common data for the client loop code. */ | |
2e73a022 | 120 | static int quit_pending; /* Set to non-zero to quit the client loop. */ |
121 | static int escape_char; /* Escape character. */ | |
5260325f | 122 | static int escape_pending; /* Last character was the escape character */ |
123 | static int last_was_cr; /* Last character was a newline. */ | |
124 | static int exit_status; /* Used to store the exit status of the command. */ | |
125 | static int stdin_eof; /* EOF has been encountered on standard error. */ | |
126 | static Buffer stdin_buffer; /* Buffer for stdin data. */ | |
127 | static Buffer stdout_buffer; /* Buffer for stdout data. */ | |
128 | static Buffer stderr_buffer; /* Buffer for stderr data. */ | |
1e3b8b07 | 129 | static u_long stdin_bytes, stdout_bytes, stderr_bytes; |
130 | static u_int buffer_high;/* Soft max buffer size. */ | |
5260325f | 131 | static int connection_in; /* Connection to server (input). */ |
132 | static int connection_out; /* Connection to server (output). */ | |
c422989b | 133 | static int need_rekeying; /* Set to non-zero if rekeying is requested. */ |
eb0dd41f | 134 | static int session_closed = 0; /* In SSH2: login session closed. */ |
5d8d32a3 | 135 | static int server_alive_timeouts = 0; |
8efc0c15 | 136 | |
396c147e | 137 | static void client_init_dispatch(void); |
8ce64345 | 138 | int session_ident = -1; |
139 | ||
5e96b616 | 140 | struct confirm_ctx { |
141 | int want_tty; | |
142 | int want_subsys; | |
143 | Buffer cmd; | |
144 | char *term; | |
145 | struct termios tio; | |
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 | ||
9bf083eb | 211 | #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1" |
212 | void | |
213 | client_x11_get_proto(const char *display, const char *xauth_path, | |
214 | u_int trusted, char **_proto, char **_data) | |
215 | { | |
216 | char cmd[1024]; | |
217 | char line[512]; | |
218 | char xdisplay[512]; | |
219 | static char proto[512], data[512]; | |
220 | FILE *f; | |
221 | int got_data = 0, generated = 0, do_unlink = 0, i; | |
222 | char *xauthdir, *xauthfile; | |
223 | struct stat st; | |
224 | ||
225 | xauthdir = xauthfile = NULL; | |
226 | *_proto = proto; | |
227 | *_data = data; | |
228 | proto[0] = data[0] = '\0'; | |
229 | ||
230 | if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) { | |
231 | debug("No xauth program."); | |
232 | } else { | |
233 | if (display == NULL) { | |
234 | debug("x11_get_proto: DISPLAY not set"); | |
235 | return; | |
236 | } | |
237 | /* | |
238 | * Handle FamilyLocal case where $DISPLAY does | |
239 | * not match an authorization entry. For this we | |
240 | * just try "xauth list unix:displaynum.screennum". | |
241 | * XXX: "localhost" match to determine FamilyLocal | |
242 | * is not perfect. | |
243 | */ | |
244 | if (strncmp(display, "localhost:", 10) == 0) { | |
245 | snprintf(xdisplay, sizeof(xdisplay), "unix:%s", | |
246 | display + 10); | |
247 | display = xdisplay; | |
248 | } | |
249 | if (trusted == 0) { | |
250 | xauthdir = xmalloc(MAXPATHLEN); | |
251 | xauthfile = xmalloc(MAXPATHLEN); | |
252 | strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN); | |
253 | if (mkdtemp(xauthdir) != NULL) { | |
254 | do_unlink = 1; | |
255 | snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile", | |
256 | xauthdir); | |
257 | snprintf(cmd, sizeof(cmd), | |
258 | "%s -f %s generate %s " SSH_X11_PROTO | |
259 | " untrusted timeout 1200 2>" _PATH_DEVNULL, | |
260 | xauth_path, xauthfile, display); | |
261 | debug2("x11_get_proto: %s", cmd); | |
262 | if (system(cmd) == 0) | |
263 | generated = 1; | |
264 | } | |
265 | } | |
266 | snprintf(cmd, sizeof(cmd), | |
267 | "%s %s%s list %s . 2>" _PATH_DEVNULL, | |
268 | xauth_path, | |
269 | generated ? "-f " : "" , | |
270 | generated ? xauthfile : "", | |
271 | display); | |
272 | debug2("x11_get_proto: %s", cmd); | |
273 | f = popen(cmd, "r"); | |
274 | if (f && fgets(line, sizeof(line), f) && | |
275 | sscanf(line, "%*s %511s %511s", proto, data) == 2) | |
276 | got_data = 1; | |
277 | if (f) | |
278 | pclose(f); | |
279 | } | |
280 | ||
281 | if (do_unlink) { | |
282 | unlink(xauthfile); | |
283 | rmdir(xauthdir); | |
284 | } | |
285 | if (xauthdir) | |
286 | xfree(xauthdir); | |
287 | if (xauthfile) | |
288 | xfree(xauthfile); | |
289 | ||
290 | /* | |
291 | * If we didn't get authentication data, just make up some | |
292 | * data. The forwarding code will check the validity of the | |
293 | * response anyway, and substitute this data. The X11 | |
294 | * server, however, will ignore this fake data and use | |
295 | * whatever authentication mechanisms it was using otherwise | |
296 | * for the local connection. | |
297 | */ | |
298 | if (!got_data) { | |
299 | u_int32_t rnd = 0; | |
300 | ||
301 | logit("Warning: No xauth data; " | |
302 | "using fake authentication data for X11 forwarding."); | |
303 | strlcpy(proto, SSH_X11_PROTO, sizeof proto); | |
304 | for (i = 0; i < 16; i++) { | |
305 | if (i % 4 == 0) | |
306 | rnd = arc4random(); | |
307 | snprintf(data + 2 * i, sizeof data - 2 * i, "%02x", | |
308 | rnd & 0xff); | |
309 | rnd >>= 8; | |
310 | } | |
311 | } | |
312 | } | |
313 | ||
aa3378df | 314 | /* |
315 | * This is called when the interactive is entered. This checks if there is | |
316 | * an EOF coming on stdin. We must check this explicitly, as select() does | |
317 | * not appear to wake up when redirecting from /dev/null. | |
318 | */ | |
8efc0c15 | 319 | |
396c147e | 320 | static void |
5ca51e19 | 321 | client_check_initial_eof_on_stdin(void) |
8efc0c15 | 322 | { |
5260325f | 323 | int len; |
324 | char buf[1]; | |
325 | ||
aa3378df | 326 | /* |
327 | * If standard input is to be "redirected from /dev/null", we simply | |
328 | * mark that we have seen an EOF and send an EOF message to the | |
329 | * server. Otherwise, we try to read a single character; it appears | |
330 | * that for some files, such /dev/null, select() never wakes up for | |
331 | * read for this descriptor, which means that we never get EOF. This | |
332 | * way we will get the EOF if stdin comes from /dev/null or similar. | |
333 | */ | |
5260325f | 334 | if (stdin_null_flag) { |
335 | /* Fake EOF on stdin. */ | |
336 | debug("Sending eof."); | |
337 | stdin_eof = 1; | |
338 | packet_start(SSH_CMSG_EOF); | |
339 | packet_send(); | |
340 | } else { | |
5260325f | 341 | enter_non_blocking(); |
342 | ||
343 | /* Check for immediate EOF on stdin. */ | |
344 | len = read(fileno(stdin), buf, 1); | |
345 | if (len == 0) { | |
aa3378df | 346 | /* EOF. Record that we have seen it and send EOF to server. */ |
5260325f | 347 | debug("Sending eof."); |
348 | stdin_eof = 1; | |
349 | packet_start(SSH_CMSG_EOF); | |
350 | packet_send(); | |
351 | } else if (len > 0) { | |
aa3378df | 352 | /* |
353 | * Got data. We must store the data in the buffer, | |
354 | * and also process it as an escape character if | |
355 | * appropriate. | |
356 | */ | |
1e3b8b07 | 357 | if ((u_char) buf[0] == escape_char) |
5260325f | 358 | escape_pending = 1; |
7e8911cd | 359 | else |
5260325f | 360 | buffer_append(&stdin_buffer, buf, 1); |
5260325f | 361 | } |
5260325f | 362 | leave_non_blocking(); |
8efc0c15 | 363 | } |
8efc0c15 | 364 | } |
365 | ||
8efc0c15 | 366 | |
aa3378df | 367 | /* |
368 | * Make packets from buffered stdin data, and buffer them for sending to the | |
369 | * connection. | |
370 | */ | |
8efc0c15 | 371 | |
396c147e | 372 | static void |
5ca51e19 | 373 | client_make_packets_from_stdin_data(void) |
8efc0c15 | 374 | { |
1e3b8b07 | 375 | u_int len; |
5260325f | 376 | |
377 | /* Send buffered stdin data to the server. */ | |
378 | while (buffer_len(&stdin_buffer) > 0 && | |
184eed6a | 379 | packet_not_very_much_data_to_write()) { |
5260325f | 380 | len = buffer_len(&stdin_buffer); |
381 | /* Keep the packets at reasonable size. */ | |
382 | if (len > packet_get_maxsize()) | |
383 | len = packet_get_maxsize(); | |
384 | packet_start(SSH_CMSG_STDIN_DATA); | |
385 | packet_put_string(buffer_ptr(&stdin_buffer), len); | |
386 | packet_send(); | |
387 | buffer_consume(&stdin_buffer, len); | |
7e8911cd | 388 | stdin_bytes += len; |
5260325f | 389 | /* If we have a pending EOF, send it now. */ |
390 | if (stdin_eof && buffer_len(&stdin_buffer) == 0) { | |
391 | packet_start(SSH_CMSG_EOF); | |
392 | packet_send(); | |
393 | } | |
8efc0c15 | 394 | } |
8efc0c15 | 395 | } |
396 | ||
aa3378df | 397 | /* |
398 | * Checks if the client window has changed, and sends a packet about it to | |
399 | * the server if so. The actual change is detected elsewhere (by a software | |
400 | * interrupt on Unix); this just checks the flag and sends a message if | |
401 | * appropriate. | |
402 | */ | |
8efc0c15 | 403 | |
396c147e | 404 | static void |
5ca51e19 | 405 | client_check_window_change(void) |
8efc0c15 | 406 | { |
8ce64345 | 407 | struct winsize ws; |
408 | ||
409 | if (! received_window_change_signal) | |
410 | return; | |
411 | /** XXX race */ | |
412 | received_window_change_signal = 0; | |
413 | ||
de273eef | 414 | debug2("client_check_window_change: changed"); |
8ce64345 | 415 | |
416 | if (compat20) { | |
5e96b616 | 417 | channel_send_window_changes(); |
8ce64345 | 418 | } else { |
5e96b616 | 419 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) |
420 | return; | |
8ce64345 | 421 | packet_start(SSH_CMSG_WINDOW_SIZE); |
422 | packet_put_int(ws.ws_row); | |
423 | packet_put_int(ws.ws_col); | |
424 | packet_put_int(ws.ws_xpixel); | |
425 | packet_put_int(ws.ws_ypixel); | |
426 | packet_send(); | |
8efc0c15 | 427 | } |
8efc0c15 | 428 | } |
429 | ||
5d8d32a3 | 430 | static void |
431 | client_global_request_reply(int type, u_int32_t seq, void *ctxt) | |
432 | { | |
433 | server_alive_timeouts = 0; | |
434 | client_global_request_reply_fwd(type, seq, ctxt); | |
435 | } | |
436 | ||
437 | static void | |
438 | server_alive_check(void) | |
439 | { | |
440 | if (++server_alive_timeouts > options.server_alive_count_max) | |
441 | packet_disconnect("Timeout, server not responding."); | |
442 | packet_start(SSH2_MSG_GLOBAL_REQUEST); | |
443 | packet_put_cstring("keepalive@openssh.com"); | |
444 | packet_put_char(1); /* boolean: want reply */ | |
445 | packet_send(); | |
446 | } | |
447 | ||
aa3378df | 448 | /* |
449 | * Waits until the client can do something (some data becomes available on | |
450 | * one of the file descriptors). | |
451 | */ | |
396c147e | 452 | static void |
39929cdb | 453 | client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp, |
9a995072 | 454 | int *maxfdp, u_int *nallocp, int rekeying) |
8efc0c15 | 455 | { |
5d8d32a3 | 456 | struct timeval tv, *tvp; |
457 | int ret; | |
458 | ||
39929cdb | 459 | /* Add any selections by the channel mechanism. */ |
489aa2e9 | 460 | channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying); |
5260325f | 461 | |
8ce64345 | 462 | if (!compat20) { |
463 | /* Read from the connection, unless our buffers are full. */ | |
464 | if (buffer_len(&stdout_buffer) < buffer_high && | |
465 | buffer_len(&stderr_buffer) < buffer_high && | |
466 | channel_not_very_much_buffered_data()) | |
39929cdb | 467 | FD_SET(connection_in, *readsetp); |
8ce64345 | 468 | /* |
469 | * Read from stdin, unless we have seen EOF or have very much | |
470 | * buffered data to send to the server. | |
471 | */ | |
472 | if (!stdin_eof && packet_not_very_much_data_to_write()) | |
39929cdb | 473 | FD_SET(fileno(stdin), *readsetp); |
8ce64345 | 474 | |
475 | /* Select stdout/stderr if have data in buffer. */ | |
476 | if (buffer_len(&stdout_buffer) > 0) | |
39929cdb | 477 | FD_SET(fileno(stdout), *writesetp); |
8ce64345 | 478 | if (buffer_len(&stderr_buffer) > 0) |
39929cdb | 479 | FD_SET(fileno(stderr), *writesetp); |
8ce64345 | 480 | } else { |
24b6b45f | 481 | /* channel_prepare_select could have closed the last channel */ |
fd6cfbaf | 482 | if (session_closed && !channel_still_open() && |
483 | !packet_have_data_to_write()) { | |
484 | /* clear mask since we did not call select() */ | |
b3ad8fe6 | 485 | memset(*readsetp, 0, *nallocp); |
486 | memset(*writesetp, 0, *nallocp); | |
fd6cfbaf | 487 | return; |
24b6b45f | 488 | } else { |
489 | FD_SET(connection_in, *readsetp); | |
490 | } | |
8ce64345 | 491 | } |
5260325f | 492 | |
5260325f | 493 | /* Select server connection if have data to write to the server. */ |
494 | if (packet_have_data_to_write()) | |
39929cdb | 495 | FD_SET(connection_out, *writesetp); |
5260325f | 496 | |
5e96b616 | 497 | if (control_fd != -1) |
498 | FD_SET(control_fd, *readsetp); | |
499 | ||
aa3378df | 500 | /* |
501 | * Wait for something to happen. This will suspend the process until | |
502 | * some selected descriptor can be read, written, or has some other | |
5d8d32a3 | 503 | * event pending. |
aa3378df | 504 | */ |
5260325f | 505 | |
5d8d32a3 | 506 | if (options.server_alive_interval == 0 || !compat20) |
507 | tvp = NULL; | |
f2107e97 | 508 | else { |
5d8d32a3 | 509 | tv.tv_sec = options.server_alive_interval; |
510 | tv.tv_usec = 0; | |
511 | tvp = &tv; | |
512 | } | |
513 | ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp); | |
514 | if (ret < 0) { | |
5260325f | 515 | char buf[100]; |
fd193ca4 | 516 | |
517 | /* | |
518 | * We have to clear the select masks, because we return. | |
519 | * We have to return, because the mainloop checks for the flags | |
520 | * set by the signal handlers. | |
521 | */ | |
b3ad8fe6 | 522 | memset(*readsetp, 0, *nallocp); |
523 | memset(*writesetp, 0, *nallocp); | |
fd193ca4 | 524 | |
5260325f | 525 | if (errno == EINTR) |
526 | return; | |
527 | /* Note: we might still have data in the buffers. */ | |
528 | snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno)); | |
529 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
5260325f | 530 | quit_pending = 1; |
5d8d32a3 | 531 | } else if (ret == 0) |
532 | server_alive_check(); | |
8efc0c15 | 533 | } |
534 | ||
396c147e | 535 | static void |
2e73a022 | 536 | client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr) |
8efc0c15 | 537 | { |
5260325f | 538 | /* Flush stdout and stderr buffers. */ |
2e73a022 | 539 | if (buffer_len(bout) > 0) |
dc54438a | 540 | atomicio(vwrite, fileno(stdout), buffer_ptr(bout), buffer_len(bout)); |
2e73a022 | 541 | if (buffer_len(berr) > 0) |
dc54438a | 542 | atomicio(vwrite, fileno(stderr), buffer_ptr(berr), buffer_len(berr)); |
5260325f | 543 | |
5260325f | 544 | leave_raw_mode(); |
545 | ||
aa3378df | 546 | /* |
547 | * Free (and clear) the buffer to reduce the amount of data that gets | |
548 | * written to swap. | |
549 | */ | |
2e73a022 | 550 | buffer_free(bin); |
551 | buffer_free(bout); | |
552 | buffer_free(berr); | |
5260325f | 553 | |
5260325f | 554 | /* Send the suspend signal to the program itself. */ |
555 | kill(getpid(), SIGTSTP); | |
556 | ||
2c9a4d41 | 557 | /* Reset window sizes in case they have changed */ |
558 | received_window_change_signal = 1; | |
5260325f | 559 | |
560 | /* OK, we have been continued by the user. Reinitialize buffers. */ | |
2e73a022 | 561 | buffer_init(bin); |
562 | buffer_init(bout); | |
563 | buffer_init(berr); | |
5260325f | 564 | |
5260325f | 565 | enter_raw_mode(); |
8efc0c15 | 566 | } |
567 | ||
396c147e | 568 | static void |
8ce64345 | 569 | client_process_net_input(fd_set * readset) |
8efc0c15 | 570 | { |
8ce64345 | 571 | int len; |
572 | char buf[8192]; | |
5260325f | 573 | |
aa3378df | 574 | /* |
575 | * Read input from the server, and add any such data to the buffer of | |
576 | * the packet subsystem. | |
577 | */ | |
5260325f | 578 | if (FD_ISSET(connection_in, readset)) { |
579 | /* Read as much as possible. */ | |
580 | len = read(connection_in, buf, sizeof(buf)); | |
581 | if (len == 0) { | |
582 | /* Received EOF. The remote host has closed the connection. */ | |
583 | snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n", | |
584 | host); | |
8efc0c15 | 585 | buffer_append(&stderr_buffer, buf, strlen(buf)); |
8efc0c15 | 586 | quit_pending = 1; |
587 | return; | |
5260325f | 588 | } |
aa3378df | 589 | /* |
590 | * There is a kernel bug on Solaris that causes select to | |
591 | * sometimes wake up even though there is no data available. | |
592 | */ | |
09cb311c | 593 | if (len < 0 && (errno == EAGAIN || errno == EINTR)) |
5260325f | 594 | len = 0; |
595 | ||
596 | if (len < 0) { | |
597 | /* An error has encountered. Perhaps there is a network problem. */ | |
598 | snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n", | |
599 | host, strerror(errno)); | |
600 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
5260325f | 601 | quit_pending = 1; |
602 | return; | |
603 | } | |
604 | packet_process_incoming(buf, len); | |
605 | } | |
8ce64345 | 606 | } |
607 | ||
5e96b616 | 608 | static void |
609 | client_subsystem_reply(int type, u_int32_t seq, void *ctxt) | |
610 | { | |
611 | int id; | |
612 | Channel *c; | |
f2107e97 | 613 | |
5e96b616 | 614 | id = packet_get_int(); |
615 | packet_check_eom(); | |
616 | ||
617 | if ((c = channel_lookup(id)) == NULL) { | |
618 | error("%s: no channel for id %d", __func__, id); | |
619 | return; | |
620 | } | |
621 | ||
622 | if (type == SSH2_MSG_CHANNEL_SUCCESS) | |
623 | debug2("Request suceeded on channel %d", id); | |
624 | else if (type == SSH2_MSG_CHANNEL_FAILURE) { | |
625 | error("Request failed on channel %d", id); | |
626 | channel_free(c); | |
627 | } | |
628 | } | |
629 | ||
630 | static void | |
631 | client_extra_session2_setup(int id, void *arg) | |
632 | { | |
633 | struct confirm_ctx *cctx = arg; | |
634 | Channel *c; | |
1786be35 | 635 | int i; |
f2107e97 | 636 | |
5e96b616 | 637 | if (cctx == NULL) |
638 | fatal("%s: cctx == NULL", __func__); | |
639 | if ((c = channel_lookup(id)) == NULL) | |
640 | fatal("%s: no channel for id %d", __func__, id); | |
641 | ||
f2107e97 | 642 | client_session2_setup(id, cctx->want_tty, cctx->want_subsys, |
1786be35 | 643 | cctx->term, &cctx->tio, c->rfd, &cctx->cmd, cctx->env, |
5e96b616 | 644 | client_subsystem_reply); |
0d34d6ce | 645 | |
5e96b616 | 646 | c->confirm_ctx = NULL; |
647 | buffer_free(&cctx->cmd); | |
1786be35 | 648 | xfree(cctx->term); |
649 | if (cctx->env != NULL) { | |
650 | for (i = 0; cctx->env[i] != NULL; i++) | |
651 | xfree(cctx->env[i]); | |
652 | xfree(cctx->env); | |
f2107e97 | 653 | } |
1786be35 | 654 | xfree(cctx); |
5e96b616 | 655 | } |
656 | ||
657 | static void | |
658 | client_process_control(fd_set * readset) | |
659 | { | |
660 | Buffer m; | |
661 | Channel *c; | |
0d34d6ce | 662 | int client_fd, new_fd[3], ver, i, allowed; |
5e96b616 | 663 | socklen_t addrlen; |
664 | struct sockaddr_storage addr; | |
665 | struct confirm_ctx *cctx; | |
666 | char *cmd; | |
f8c6db83 | 667 | u_int len, env_len, command, flags; |
5e96b616 | 668 | uid_t euid; |
669 | gid_t egid; | |
670 | ||
671 | /* | |
672 | * Accept connection on control socket | |
673 | */ | |
674 | if (control_fd == -1 || !FD_ISSET(control_fd, readset)) | |
675 | return; | |
676 | ||
677 | memset(&addr, 0, sizeof(addr)); | |
678 | addrlen = sizeof(addr); | |
679 | if ((client_fd = accept(control_fd, | |
680 | (struct sockaddr*)&addr, &addrlen)) == -1) { | |
681 | error("%s accept: %s", __func__, strerror(errno)); | |
682 | return; | |
683 | } | |
684 | ||
685 | if (getpeereid(client_fd, &euid, &egid) < 0) { | |
686 | error("%s getpeereid failed: %s", __func__, strerror(errno)); | |
687 | close(client_fd); | |
688 | return; | |
689 | } | |
690 | if ((euid != 0) && (getuid() != euid)) { | |
691 | error("control mode uid mismatch: peer euid %u != uid %u", | |
692 | (u_int) euid, (u_int) getuid()); | |
693 | close(client_fd); | |
694 | return; | |
695 | } | |
0d34d6ce | 696 | |
5e96b616 | 697 | unset_nonblock(client_fd); |
698 | ||
f8c6db83 | 699 | /* Read command */ |
5e96b616 | 700 | buffer_init(&m); |
f8c6db83 | 701 | if (ssh_msg_recv(client_fd, &m) == -1) { |
702 | error("%s: client msg_recv failed", __func__); | |
703 | close(client_fd); | |
704 | buffer_free(&m); | |
705 | return; | |
706 | } | |
707 | if ((ver = buffer_get_char(&m)) != 1) { | |
708 | error("%s: wrong client version %d", __func__, ver); | |
709 | buffer_free(&m); | |
710 | close(client_fd); | |
711 | return; | |
712 | } | |
713 | ||
714 | allowed = 1; | |
715 | command = buffer_get_int(&m); | |
716 | flags = buffer_get_int(&m); | |
717 | ||
718 | buffer_clear(&m); | |
5e96b616 | 719 | |
f8c6db83 | 720 | switch (command) { |
721 | case SSHMUX_COMMAND_OPEN: | |
9dfd96d6 | 722 | if (options.control_master == SSHCTL_MASTER_ASK || |
723 | options.control_master == SSHCTL_MASTER_AUTO_ASK) | |
f8c6db83 | 724 | allowed = ask_permission("Allow shared connection " |
725 | "to %s? ", host); | |
726 | /* continue below */ | |
727 | break; | |
728 | case SSHMUX_COMMAND_TERMINATE: | |
9dfd96d6 | 729 | if (options.control_master == SSHCTL_MASTER_ASK || |
730 | options.control_master == SSHCTL_MASTER_AUTO_ASK) | |
f8c6db83 | 731 | allowed = ask_permission("Terminate shared connection " |
732 | "to %s? ", host); | |
733 | if (allowed) | |
734 | quit_pending = 1; | |
f8cc7664 | 735 | /* FALLTHROUGH */ |
f8c6db83 | 736 | case SSHMUX_COMMAND_ALIVE_CHECK: |
737 | /* Reply for SSHMUX_COMMAND_TERMINATE and ALIVE_CHECK */ | |
738 | buffer_clear(&m); | |
739 | buffer_put_int(&m, allowed); | |
740 | buffer_put_int(&m, getpid()); | |
741 | if (ssh_msg_send(client_fd, /* version */1, &m) == -1) { | |
742 | error("%s: client msg_send failed", __func__); | |
743 | close(client_fd); | |
744 | buffer_free(&m); | |
745 | return; | |
746 | } | |
747 | buffer_free(&m); | |
748 | close(client_fd); | |
749 | return; | |
750 | default: | |
751 | error("Unsupported command %d", command); | |
752 | buffer_free(&m); | |
753 | close(client_fd); | |
754 | return; | |
755 | } | |
756 | ||
757 | /* Reply for SSHMUX_COMMAND_OPEN */ | |
758 | buffer_clear(&m); | |
0d34d6ce | 759 | buffer_put_int(&m, allowed); |
5e96b616 | 760 | buffer_put_int(&m, getpid()); |
f8c6db83 | 761 | if (ssh_msg_send(client_fd, /* version */1, &m) == -1) { |
5e96b616 | 762 | error("%s: client msg_send failed", __func__); |
763 | close(client_fd); | |
0d34d6ce | 764 | buffer_free(&m); |
5e96b616 | 765 | return; |
766 | } | |
5e96b616 | 767 | |
0d34d6ce | 768 | if (!allowed) { |
769 | error("Refused control connection"); | |
770 | close(client_fd); | |
771 | buffer_free(&m); | |
772 | return; | |
773 | } | |
774 | ||
f8c6db83 | 775 | buffer_clear(&m); |
5e96b616 | 776 | if (ssh_msg_recv(client_fd, &m) == -1) { |
777 | error("%s: client msg_recv failed", __func__); | |
778 | close(client_fd); | |
0d34d6ce | 779 | buffer_free(&m); |
5e96b616 | 780 | return; |
781 | } | |
f8c6db83 | 782 | if ((ver = buffer_get_char(&m)) != 1) { |
5e96b616 | 783 | error("%s: wrong client version %d", __func__, ver); |
784 | buffer_free(&m); | |
785 | close(client_fd); | |
786 | return; | |
787 | } | |
788 | ||
789 | cctx = xmalloc(sizeof(*cctx)); | |
790 | memset(cctx, 0, sizeof(*cctx)); | |
f8c6db83 | 791 | cctx->want_tty = (flags & SSHMUX_FLAG_TTY) != 0; |
792 | cctx->want_subsys = (flags & SSHMUX_FLAG_SUBSYS) != 0; | |
5e96b616 | 793 | cctx->term = buffer_get_string(&m, &len); |
794 | ||
795 | cmd = buffer_get_string(&m, &len); | |
796 | buffer_init(&cctx->cmd); | |
797 | buffer_append(&cctx->cmd, cmd, strlen(cmd)); | |
798 | ||
1786be35 | 799 | env_len = buffer_get_int(&m); |
800 | env_len = MIN(env_len, 4096); | |
801 | debug3("%s: receiving %d env vars", __func__, env_len); | |
802 | if (env_len != 0) { | |
803 | cctx->env = xmalloc(sizeof(*cctx->env) * (env_len + 1)); | |
804 | for (i = 0; i < env_len; i++) | |
805 | cctx->env[i] = buffer_get_string(&m, &len); | |
806 | cctx->env[i] = NULL; | |
807 | } | |
808 | ||
5e96b616 | 809 | debug2("%s: accepted tty %d, subsys %d, cmd %s", __func__, |
810 | cctx->want_tty, cctx->want_subsys, cmd); | |
811 | ||
812 | /* Gather fds from client */ | |
813 | new_fd[0] = mm_receive_fd(client_fd); | |
814 | new_fd[1] = mm_receive_fd(client_fd); | |
815 | new_fd[2] = mm_receive_fd(client_fd); | |
816 | ||
817 | debug2("%s: got fds stdin %d, stdout %d, stderr %d", __func__, | |
818 | new_fd[0], new_fd[1], new_fd[2]); | |
819 | ||
820 | /* Try to pick up ttymodes from client before it goes raw */ | |
821 | if (cctx->want_tty && tcgetattr(new_fd[0], &cctx->tio) == -1) | |
822 | error("%s: tcgetattr: %s", __func__, strerror(errno)); | |
823 | ||
f8c6db83 | 824 | /* This roundtrip is just for synchronisation of ttymodes */ |
5e96b616 | 825 | buffer_clear(&m); |
f8c6db83 | 826 | if (ssh_msg_send(client_fd, /* version */1, &m) == -1) { |
5e96b616 | 827 | error("%s: client msg_send failed", __func__); |
828 | close(client_fd); | |
829 | close(new_fd[0]); | |
830 | close(new_fd[1]); | |
831 | close(new_fd[2]); | |
0d34d6ce | 832 | buffer_free(&m); |
f8c6db83 | 833 | xfree(cctx->term); |
834 | if (env_len != 0) { | |
835 | for (i = 0; i < env_len; i++) | |
836 | xfree(cctx->env[i]); | |
837 | xfree(cctx->env); | |
838 | } | |
5e96b616 | 839 | return; |
840 | } | |
841 | buffer_free(&m); | |
842 | ||
843 | /* enable nonblocking unless tty */ | |
844 | if (!isatty(new_fd[0])) | |
845 | set_nonblock(new_fd[0]); | |
846 | if (!isatty(new_fd[1])) | |
847 | set_nonblock(new_fd[1]); | |
848 | if (!isatty(new_fd[2])) | |
849 | set_nonblock(new_fd[2]); | |
850 | ||
851 | set_nonblock(client_fd); | |
852 | ||
f2107e97 | 853 | c = channel_new("session", SSH_CHANNEL_OPENING, |
5e96b616 | 854 | new_fd[0], new_fd[1], new_fd[2], |
855 | CHAN_SES_WINDOW_DEFAULT, CHAN_SES_PACKET_DEFAULT, | |
856 | CHAN_EXTENDED_WRITE, "client-session", /*nonblock*/0); | |
857 | ||
858 | /* XXX */ | |
859 | c->ctl_fd = client_fd; | |
860 | ||
861 | debug3("%s: channel_new: %d", __func__, c->self); | |
862 | ||
863 | channel_send_open(c->self); | |
864 | channel_register_confirm(c->self, client_extra_session2_setup, cctx); | |
865 | } | |
866 | ||
c53c54c2 | 867 | static void |
ec9b7086 | 868 | process_cmdline(void) |
c53c54c2 | 869 | { |
c53c54c2 | 870 | void (*handler)(int); |
3867aa0a | 871 | char *s, *cmd, *cancel_host; |
d740ec16 | 872 | int delete = 0; |
c53c54c2 | 873 | int local = 0; |
3867aa0a | 874 | u_short cancel_port; |
875 | Forward fwd; | |
c53c54c2 | 876 | |
877 | leave_raw_mode(); | |
875ec275 | 878 | handler = signal(SIGINT, SIG_IGN); |
ec9b7086 | 879 | cmd = s = read_passphrase("\r\nssh> ", RP_ECHO); |
c53c54c2 | 880 | if (s == NULL) |
881 | goto out; | |
c53c54c2 | 882 | while (*s && isspace(*s)) |
883 | s++; | |
d740ec16 | 884 | if (*s == '-') |
885 | s++; /* Skip cmdline '-', if any */ | |
27c6fcae | 886 | if (*s == '\0') |
c53c54c2 | 887 | goto out; |
d740ec16 | 888 | |
7069a5e2 | 889 | if (*s == 'h' || *s == 'H' || *s == '?') { |
d740ec16 | 890 | logit("Commands:"); |
891 | logit(" -Lport:host:hostport Request local forward"); | |
892 | logit(" -Rport:host:hostport Request remote forward"); | |
893 | logit(" -KRhostport Cancel remote forward"); | |
894 | goto out; | |
895 | } | |
896 | ||
897 | if (*s == 'K') { | |
898 | delete = 1; | |
899 | s++; | |
900 | } | |
901 | if (*s != 'L' && *s != 'R') { | |
bbe88b6d | 902 | logit("Invalid command."); |
c53c54c2 | 903 | goto out; |
904 | } | |
d740ec16 | 905 | if (*s == 'L') |
c53c54c2 | 906 | local = 1; |
d740ec16 | 907 | if (local && delete) { |
908 | logit("Not supported."); | |
909 | goto out; | |
910 | } | |
911 | if ((!local || delete) && !compat20) { | |
bbe88b6d | 912 | logit("Not supported for SSH protocol version 1."); |
c53c54c2 | 913 | goto out; |
914 | } | |
d740ec16 | 915 | |
916 | s++; | |
c53c54c2 | 917 | while (*s && isspace(*s)) |
918 | s++; | |
919 | ||
d740ec16 | 920 | if (delete) { |
3867aa0a | 921 | cancel_port = 0; |
922 | cancel_host = hpdelim(&s); /* may be NULL */ | |
923 | if (s != NULL) { | |
924 | cancel_port = a2port(s); | |
925 | cancel_host = cleanhostname(cancel_host); | |
926 | } else { | |
927 | cancel_port = a2port(cancel_host); | |
928 | cancel_host = NULL; | |
d740ec16 | 929 | } |
3867aa0a | 930 | if (cancel_port == 0) { |
931 | logit("Bad forwarding close port"); | |
c53c54c2 | 932 | goto out; |
933 | } | |
3867aa0a | 934 | channel_request_rforward_cancel(cancel_host, cancel_port); |
d740ec16 | 935 | } else { |
3867aa0a | 936 | if (!parse_forward(&fwd, s)) { |
d740ec16 | 937 | logit("Bad forwarding specification."); |
938 | goto out; | |
939 | } | |
d740ec16 | 940 | if (local) { |
3867aa0a | 941 | if (channel_setup_local_fwd_listener(fwd.listen_host, |
942 | fwd.listen_port, fwd.connect_host, | |
943 | fwd.connect_port, options.gateway_ports) < 0) { | |
d740ec16 | 944 | logit("Port forwarding failed."); |
945 | goto out; | |
946 | } | |
3867aa0a | 947 | } else { |
948 | channel_request_remote_forwarding(fwd.listen_host, | |
949 | fwd.listen_port, fwd.connect_host, | |
950 | fwd.connect_port); | |
951 | } | |
952 | ||
d740ec16 | 953 | logit("Forwarding port."); |
954 | } | |
955 | ||
c53c54c2 | 956 | out: |
957 | signal(SIGINT, handler); | |
958 | enter_raw_mode(); | |
959 | if (cmd) | |
960 | xfree(cmd); | |
961 | } | |
962 | ||
2e73a022 | 963 | /* process the characters one by one */ |
396c147e | 964 | static int |
2e73a022 | 965 | process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len) |
966 | { | |
967 | char string[1024]; | |
968 | pid_t pid; | |
969 | int bytes = 0; | |
1e3b8b07 | 970 | u_int i; |
971 | u_char ch; | |
2e73a022 | 972 | char *s; |
973 | ||
974 | for (i = 0; i < len; i++) { | |
975 | /* Get one character at a time. */ | |
976 | ch = buf[i]; | |
977 | ||
978 | if (escape_pending) { | |
979 | /* We have previously seen an escape character. */ | |
980 | /* Clear the flag now. */ | |
981 | escape_pending = 0; | |
982 | ||
983 | /* Process the escaped character. */ | |
984 | switch (ch) { | |
985 | case '.': | |
986 | /* Terminate the connection. */ | |
987 | snprintf(string, sizeof string, "%c.\r\n", escape_char); | |
988 | buffer_append(berr, string, strlen(string)); | |
2e73a022 | 989 | |
990 | quit_pending = 1; | |
991 | return -1; | |
992 | ||
993 | case 'Z' - 64: | |
994 | /* Suspend the program. */ | |
995 | /* Print a message to that effect to the user. */ | |
996 | snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char); | |
997 | buffer_append(berr, string, strlen(string)); | |
2e73a022 | 998 | |
999 | /* Restore terminal modes and suspend. */ | |
1000 | client_suspend_self(bin, bout, berr); | |
1001 | ||
1002 | /* We have been continued. */ | |
1003 | continue; | |
1004 | ||
16a79097 | 1005 | case 'B': |
1006 | if (compat20) { | |
1007 | snprintf(string, sizeof string, | |
1008 | "%cB\r\n", escape_char); | |
1009 | buffer_append(berr, string, | |
1010 | strlen(string)); | |
1011 | channel_request_start(session_ident, | |
1012 | "break", 0); | |
1013 | packet_put_int(1000); | |
1014 | packet_send(); | |
1015 | } | |
1016 | continue; | |
1017 | ||
e092ce67 | 1018 | case 'R': |
54506d2e | 1019 | if (compat20) { |
1020 | if (datafellows & SSH_BUG_NOREKEY) | |
bbe88b6d | 1021 | logit("Server does not support re-keying"); |
54506d2e | 1022 | else |
1023 | need_rekeying = 1; | |
1024 | } | |
e092ce67 | 1025 | continue; |
1026 | ||
2e73a022 | 1027 | case '&': |
2e73a022 | 1028 | /* |
1029 | * Detach the program (continue to serve connections, | |
1030 | * but put in background and no more new connections). | |
1031 | */ | |
2e73a022 | 1032 | /* Restore tty modes. */ |
1033 | leave_raw_mode(); | |
1034 | ||
1035 | /* Stop listening for new connections. */ | |
c6940381 | 1036 | channel_stop_listening(); |
2e73a022 | 1037 | |
c6940381 | 1038 | snprintf(string, sizeof string, |
1039 | "%c& [backgrounded]\n", escape_char); | |
1040 | buffer_append(berr, string, strlen(string)); | |
2e73a022 | 1041 | |
1042 | /* Fork into background. */ | |
1043 | pid = fork(); | |
1044 | if (pid < 0) { | |
1045 | error("fork: %.100s", strerror(errno)); | |
1046 | continue; | |
1047 | } | |
1048 | if (pid != 0) { /* This is the parent. */ | |
1049 | /* The parent just exits. */ | |
1050 | exit(0); | |
1051 | } | |
1052 | /* The child continues serving connections. */ | |
c6940381 | 1053 | if (compat20) { |
1054 | buffer_append(bin, "\004", 1); | |
1055 | /* fake EOF on stdin */ | |
1056 | return -1; | |
1057 | } else if (!stdin_eof) { | |
1058 | /* | |
1059 | * Sending SSH_CMSG_EOF alone does not always appear | |
1060 | * to be enough. So we try to send an EOF character | |
1061 | * first. | |
1062 | */ | |
1063 | packet_start(SSH_CMSG_STDIN_DATA); | |
1064 | packet_put_string("\004", 1); | |
1065 | packet_send(); | |
1066 | /* Close stdin. */ | |
1067 | stdin_eof = 1; | |
1068 | if (buffer_len(bin) == 0) { | |
1069 | packet_start(SSH_CMSG_EOF); | |
1070 | packet_send(); | |
1071 | } | |
1072 | } | |
1073 | continue; | |
2e73a022 | 1074 | |
1075 | case '?': | |
1076 | snprintf(string, sizeof string, | |
1077 | "%c?\r\n\ | |
1078 | Supported escape sequences:\r\n\ | |
1d77f8cb | 1079 | %c. - terminate connection\r\n\ |
16a79097 | 1080 | %cB - send a BREAK to the remote system\r\n\ |
1d77f8cb | 1081 | %cC - open a command line\r\n\ |
1082 | %cR - Request rekey (SSH protocol 2 only)\r\n\ | |
1083 | %c^Z - suspend ssh\r\n\ | |
1084 | %c# - list forwarded connections\r\n\ | |
1085 | %c& - background ssh (when waiting for connections to terminate)\r\n\ | |
1086 | %c? - this message\r\n\ | |
1087 | %c%c - send the escape character by typing it twice\r\n\ | |
2e73a022 | 1088 | (Note that escapes are only recognized immediately after newline.)\r\n", |
1d77f8cb | 1089 | escape_char, escape_char, escape_char, escape_char, |
1090 | escape_char, escape_char, escape_char, escape_char, | |
16a79097 | 1091 | escape_char, escape_char, escape_char); |
2e73a022 | 1092 | buffer_append(berr, string, strlen(string)); |
1093 | continue; | |
1094 | ||
1095 | case '#': | |
1096 | snprintf(string, sizeof string, "%c#\r\n", escape_char); | |
1097 | buffer_append(berr, string, strlen(string)); | |
1098 | s = channel_open_message(); | |
1099 | buffer_append(berr, s, strlen(s)); | |
1100 | xfree(s); | |
1101 | continue; | |
1102 | ||
c53c54c2 | 1103 | case 'C': |
ec9b7086 | 1104 | process_cmdline(); |
c53c54c2 | 1105 | continue; |
1106 | ||
2e73a022 | 1107 | default: |
1108 | if (ch != escape_char) { | |
1109 | buffer_put_char(bin, escape_char); | |
1110 | bytes++; | |
1111 | } | |
1112 | /* Escaped characters fall through here */ | |
1113 | break; | |
1114 | } | |
1115 | } else { | |
1116 | /* | |
1117 | * The previous character was not an escape char. Check if this | |
1118 | * is an escape. | |
1119 | */ | |
1120 | if (last_was_cr && ch == escape_char) { | |
1121 | /* It is. Set the flag and continue to next character. */ | |
1122 | escape_pending = 1; | |
1123 | continue; | |
1124 | } | |
1125 | } | |
1126 | ||
1127 | /* | |
1128 | * Normal character. Record whether it was a newline, | |
1129 | * and append it to the buffer. | |
1130 | */ | |
1131 | last_was_cr = (ch == '\r' || ch == '\n'); | |
1132 | buffer_put_char(bin, ch); | |
1133 | bytes++; | |
1134 | } | |
1135 | return bytes; | |
1136 | } | |
1137 | ||
396c147e | 1138 | static void |
8ce64345 | 1139 | client_process_input(fd_set * readset) |
1140 | { | |
9da5c3c9 | 1141 | int len; |
2e73a022 | 1142 | char buf[8192]; |
8ce64345 | 1143 | |
5260325f | 1144 | /* Read input from stdin. */ |
1145 | if (FD_ISSET(fileno(stdin), readset)) { | |
1146 | /* Read as much as possible. */ | |
1147 | len = read(fileno(stdin), buf, sizeof(buf)); | |
cf6bc93c | 1148 | if (len < 0 && (errno == EAGAIN || errno == EINTR)) |
1149 | return; /* we'll try again later */ | |
5260325f | 1150 | if (len <= 0) { |
aa3378df | 1151 | /* |
1152 | * Received EOF or error. They are treated | |
1153 | * similarly, except that an error message is printed | |
1154 | * if it was an error condition. | |
1155 | */ | |
5260325f | 1156 | if (len < 0) { |
1157 | snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno)); | |
1158 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
5260325f | 1159 | } |
1160 | /* Mark that we have seen EOF. */ | |
1161 | stdin_eof = 1; | |
aa3378df | 1162 | /* |
1163 | * Send an EOF message to the server unless there is | |
1164 | * data in the buffer. If there is data in the | |
1165 | * buffer, no message will be sent now. Code | |
1166 | * elsewhere will send the EOF when the buffer | |
1167 | * becomes empty if stdin_eof is set. | |
1168 | */ | |
5260325f | 1169 | if (buffer_len(&stdin_buffer) == 0) { |
8efc0c15 | 1170 | packet_start(SSH_CMSG_EOF); |
1171 | packet_send(); | |
5260325f | 1172 | } |
4bf9c10e | 1173 | } else if (escape_char == SSH_ESCAPECHAR_NONE) { |
aa3378df | 1174 | /* |
1175 | * Normal successful read, and no escape character. | |
1176 | * Just append the data to buffer. | |
1177 | */ | |
5260325f | 1178 | buffer_append(&stdin_buffer, buf, len); |
5260325f | 1179 | } else { |
aa3378df | 1180 | /* |
1181 | * Normal, successful read. But we have an escape character | |
1182 | * and have to process the characters one by one. | |
1183 | */ | |
7e8911cd | 1184 | if (process_escapes(&stdin_buffer, &stdout_buffer, |
1185 | &stderr_buffer, buf, len) == -1) | |
2e73a022 | 1186 | return; |
5260325f | 1187 | } |
1188 | } | |
8efc0c15 | 1189 | } |
1190 | ||
396c147e | 1191 | static void |
5260325f | 1192 | client_process_output(fd_set * writeset) |
8efc0c15 | 1193 | { |
5260325f | 1194 | int len; |
1195 | char buf[100]; | |
1196 | ||
1197 | /* Write buffered output to stdout. */ | |
1198 | if (FD_ISSET(fileno(stdout), writeset)) { | |
1199 | /* Write as much data as possible. */ | |
1200 | len = write(fileno(stdout), buffer_ptr(&stdout_buffer), | |
a408af76 | 1201 | buffer_len(&stdout_buffer)); |
5260325f | 1202 | if (len <= 0) { |
cf6bc93c | 1203 | if (errno == EINTR || errno == EAGAIN) |
5260325f | 1204 | len = 0; |
1205 | else { | |
aa3378df | 1206 | /* |
1207 | * An error or EOF was encountered. Put an | |
1208 | * error message to stderr buffer. | |
1209 | */ | |
5260325f | 1210 | snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno)); |
1211 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
5260325f | 1212 | quit_pending = 1; |
1213 | return; | |
1214 | } | |
1215 | } | |
1216 | /* Consume printed data from the buffer. */ | |
1217 | buffer_consume(&stdout_buffer, len); | |
cd332296 | 1218 | stdout_bytes += len; |
5260325f | 1219 | } |
1220 | /* Write buffered output to stderr. */ | |
1221 | if (FD_ISSET(fileno(stderr), writeset)) { | |
1222 | /* Write as much data as possible. */ | |
1223 | len = write(fileno(stderr), buffer_ptr(&stderr_buffer), | |
a408af76 | 1224 | buffer_len(&stderr_buffer)); |
5260325f | 1225 | if (len <= 0) { |
cf6bc93c | 1226 | if (errno == EINTR || errno == EAGAIN) |
5260325f | 1227 | len = 0; |
1228 | else { | |
aa3378df | 1229 | /* EOF or error, but can't even print error message. */ |
5260325f | 1230 | quit_pending = 1; |
1231 | return; | |
1232 | } | |
1233 | } | |
1234 | /* Consume printed characters from the buffer. */ | |
1235 | buffer_consume(&stderr_buffer, len); | |
cd332296 | 1236 | stderr_bytes += len; |
8efc0c15 | 1237 | } |
8efc0c15 | 1238 | } |
1239 | ||
7368a6c8 | 1240 | /* |
1241 | * Get packets from the connection input buffer, and process them as long as | |
1242 | * there are packets available. | |
1243 | * | |
1244 | * Any unknown packets received during the actual | |
1245 | * session cause the session to terminate. This is | |
1246 | * intended to make debugging easier since no | |
1247 | * confirmations are sent. Any compatible protocol | |
1248 | * extensions must be negotiated during the | |
1249 | * preparatory phase. | |
1250 | */ | |
1251 | ||
396c147e | 1252 | static void |
5ca51e19 | 1253 | client_process_buffered_input_packets(void) |
7368a6c8 | 1254 | { |
e092ce67 | 1255 | dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL); |
7368a6c8 | 1256 | } |
1257 | ||
2e73a022 | 1258 | /* scan buf[] for '~' before sending data to the peer */ |
1259 | ||
396c147e | 1260 | static int |
2e73a022 | 1261 | simple_escape_filter(Channel *c, char *buf, int len) |
1262 | { | |
1263 | /* XXX we assume c->extended is writeable */ | |
1264 | return process_escapes(&c->input, &c->output, &c->extended, buf, len); | |
1265 | } | |
1266 | ||
396c147e | 1267 | static void |
eb0dd41f | 1268 | client_channel_closed(int id, void *arg) |
1269 | { | |
418e724c | 1270 | channel_cancel_cleanup(id); |
eb0dd41f | 1271 | session_closed = 1; |
82de775c | 1272 | leave_raw_mode(); |
eb0dd41f | 1273 | } |
1274 | ||
aa3378df | 1275 | /* |
1276 | * Implements the interactive session with the server. This is called after | |
1277 | * the user has been authenticated, and a command has been started on the | |
4bf9c10e | 1278 | * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character |
1279 | * used as an escape character for terminating or suspending the session. | |
aa3378df | 1280 | */ |
8efc0c15 | 1281 | |
6ae2364d | 1282 | int |
2e73a022 | 1283 | client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id) |
8efc0c15 | 1284 | { |
39929cdb | 1285 | fd_set *readset = NULL, *writeset = NULL; |
5260325f | 1286 | double start_time, total_time; |
9a995072 | 1287 | int max_fd = 0, max_fd2 = 0, len, rekeying = 0; |
1288 | u_int nalloc = 0; | |
5260325f | 1289 | char buf[100]; |
1290 | ||
1291 | debug("Entering interactive session."); | |
1292 | ||
1293 | start_time = get_current_time(); | |
1294 | ||
1295 | /* Initialize variables. */ | |
1296 | escape_pending = 0; | |
1297 | last_was_cr = 1; | |
1298 | exit_status = -1; | |
1299 | stdin_eof = 0; | |
1300 | buffer_high = 64 * 1024; | |
1301 | connection_in = packet_get_connection_in(); | |
1302 | connection_out = packet_get_connection_out(); | |
39929cdb | 1303 | max_fd = MAX(connection_in, connection_out); |
5e96b616 | 1304 | if (control_fd != -1) |
1305 | max_fd = MAX(max_fd, control_fd); | |
39929cdb | 1306 | |
1307 | if (!compat20) { | |
e968270c | 1308 | /* enable nonblocking unless tty */ |
1309 | if (!isatty(fileno(stdin))) | |
1310 | set_nonblock(fileno(stdin)); | |
1311 | if (!isatty(fileno(stdout))) | |
1312 | set_nonblock(fileno(stdout)); | |
1313 | if (!isatty(fileno(stderr))) | |
1314 | set_nonblock(fileno(stderr)); | |
39929cdb | 1315 | max_fd = MAX(max_fd, fileno(stdin)); |
1316 | max_fd = MAX(max_fd, fileno(stdout)); | |
1317 | max_fd = MAX(max_fd, fileno(stderr)); | |
1318 | } | |
5260325f | 1319 | stdin_bytes = 0; |
1320 | stdout_bytes = 0; | |
1321 | stderr_bytes = 0; | |
1322 | quit_pending = 0; | |
1323 | escape_char = escape_char_arg; | |
1324 | ||
1325 | /* Initialize buffers. */ | |
1326 | buffer_init(&stdin_buffer); | |
1327 | buffer_init(&stdout_buffer); | |
1328 | buffer_init(&stderr_buffer); | |
1329 | ||
7368a6c8 | 1330 | client_init_dispatch(); |
1331 | ||
3c93c917 | 1332 | /* |
1333 | * Set signal handlers, (e.g. to restore non-blocking mode) | |
1334 | * but don't overwrite SIG_IGN, matches behaviour from rsh(1) | |
1335 | */ | |
d3e5d1e9 | 1336 | if (signal(SIGHUP, SIG_IGN) != SIG_IGN) |
1337 | signal(SIGHUP, signal_handler); | |
3c93c917 | 1338 | if (signal(SIGINT, SIG_IGN) != SIG_IGN) |
1339 | signal(SIGINT, signal_handler); | |
1340 | if (signal(SIGQUIT, SIG_IGN) != SIG_IGN) | |
1341 | signal(SIGQUIT, signal_handler); | |
1342 | if (signal(SIGTERM, SIG_IGN) != SIG_IGN) | |
1343 | signal(SIGTERM, signal_handler); | |
2c9a4d41 | 1344 | signal(SIGWINCH, window_change_handler); |
5260325f | 1345 | |
5260325f | 1346 | if (have_pty) |
1347 | enter_raw_mode(); | |
1348 | ||
1fc8ccdf | 1349 | if (compat20) { |
1350 | session_ident = ssh2_chan_id; | |
4bf9c10e | 1351 | if (escape_char != SSH_ESCAPECHAR_NONE) |
1fc8ccdf | 1352 | channel_register_filter(session_ident, |
1353 | simple_escape_filter); | |
eb0dd41f | 1354 | if (session_ident != -1) |
1355 | channel_register_cleanup(session_ident, | |
1356 | client_channel_closed); | |
1fc8ccdf | 1357 | } else { |
1358 | /* Check if we should immediately send eof on stdin. */ | |
8ce64345 | 1359 | client_check_initial_eof_on_stdin(); |
1fc8ccdf | 1360 | } |
2e73a022 | 1361 | |
5260325f | 1362 | /* Main loop of the client for the interactive session mode. */ |
1363 | while (!quit_pending) { | |
5260325f | 1364 | |
aa3378df | 1365 | /* Process buffered packets sent by the server. */ |
5260325f | 1366 | client_process_buffered_input_packets(); |
1367 | ||
eb0dd41f | 1368 | if (compat20 && session_closed && !channel_still_open()) |
8ce64345 | 1369 | break; |
eb0dd41f | 1370 | |
1371 | rekeying = (xxx_kex != NULL && !xxx_kex->done); | |
8ce64345 | 1372 | |
c422989b | 1373 | if (rekeying) { |
1374 | debug("rekeying in progress"); | |
1375 | } else { | |
1376 | /* | |
1377 | * Make packets of buffered stdin data, and buffer | |
1378 | * them for sending to the server. | |
1379 | */ | |
1380 | if (!compat20) | |
1381 | client_make_packets_from_stdin_data(); | |
5260325f | 1382 | |
c422989b | 1383 | /* |
1384 | * Make packets from buffered channel data, and | |
1385 | * enqueue them for sending to the server. | |
1386 | */ | |
1387 | if (packet_not_very_much_data_to_write()) | |
1388 | channel_output_poll(); | |
5260325f | 1389 | |
c422989b | 1390 | /* |
1391 | * Check if the window size has changed, and buffer a | |
1392 | * message about it to the server if so. | |
1393 | */ | |
1394 | client_check_window_change(); | |
5260325f | 1395 | |
c422989b | 1396 | if (quit_pending) |
1397 | break; | |
1398 | } | |
aa3378df | 1399 | /* |
1400 | * Wait until we have something to do (something becomes | |
1401 | * available on one of the descriptors). | |
1402 | */ | |
489aa2e9 | 1403 | max_fd2 = max_fd; |
c422989b | 1404 | client_wait_until_can_do_something(&readset, &writeset, |
489aa2e9 | 1405 | &max_fd2, &nalloc, rekeying); |
5260325f | 1406 | |
1407 | if (quit_pending) | |
1408 | break; | |
1409 | ||
c422989b | 1410 | /* Do channel operations unless rekeying in progress. */ |
1411 | if (!rekeying) { | |
1412 | channel_after_select(readset, writeset); | |
ffd7b36b | 1413 | if (need_rekeying || packet_need_rekeying()) { |
1414 | debug("need rekeying"); | |
c422989b | 1415 | xxx_kex->done = 0; |
1416 | kex_send_kexinit(xxx_kex); | |
1417 | need_rekeying = 0; | |
1418 | } | |
1419 | } | |
5260325f | 1420 | |
8ce64345 | 1421 | /* Buffer input from the connection. */ |
39929cdb | 1422 | client_process_net_input(readset); |
5260325f | 1423 | |
5e96b616 | 1424 | /* Accept control connections. */ |
1425 | client_process_control(readset); | |
1426 | ||
8ce64345 | 1427 | if (quit_pending) |
1428 | break; | |
1429 | ||
1430 | if (!compat20) { | |
1431 | /* Buffer data from stdin */ | |
39929cdb | 1432 | client_process_input(readset); |
8ce64345 | 1433 | /* |
1434 | * Process output to stdout and stderr. Output to | |
1435 | * the connection is processed elsewhere (above). | |
1436 | */ | |
39929cdb | 1437 | client_process_output(writeset); |
8ce64345 | 1438 | } |
5260325f | 1439 | |
aa3378df | 1440 | /* Send as much buffered packet data as possible to the sender. */ |
39929cdb | 1441 | if (FD_ISSET(connection_out, writeset)) |
5260325f | 1442 | packet_write_poll(); |
1443 | } | |
39929cdb | 1444 | if (readset) |
1445 | xfree(readset); | |
1446 | if (writeset) | |
1447 | xfree(writeset); | |
5260325f | 1448 | |
1449 | /* Terminate the session. */ | |
1450 | ||
1451 | /* Stop watching for window change. */ | |
2c9a4d41 | 1452 | signal(SIGWINCH, SIG_DFL); |
5260325f | 1453 | |
d6746a0b | 1454 | channel_free_all(); |
5260325f | 1455 | |
c9130033 | 1456 | if (have_pty) |
1457 | leave_raw_mode(); | |
89aa792b | 1458 | |
1459 | /* restore blocking io */ | |
1460 | if (!isatty(fileno(stdin))) | |
1461 | unset_nonblock(fileno(stdin)); | |
1462 | if (!isatty(fileno(stdout))) | |
1463 | unset_nonblock(fileno(stdout)); | |
1464 | if (!isatty(fileno(stderr))) | |
1465 | unset_nonblock(fileno(stderr)); | |
1466 | ||
66357af5 | 1467 | /* |
1468 | * If there was no shell or command requested, there will be no remote | |
1469 | * exit status to be returned. In that case, clear error code if the | |
1470 | * connection was deliberately terminated at this end. | |
1471 | */ | |
1472 | if (no_shell_flag && received_signal == SIGTERM) { | |
1473 | received_signal = 0; | |
1474 | exit_status = 0; | |
1475 | } | |
1476 | ||
82de775c | 1477 | if (received_signal) |
010f9726 | 1478 | fatal("Killed by signal %d.", (int) received_signal); |
c9130033 | 1479 | |
1480 | /* | |
1481 | * In interactive mode (with pseudo tty) display a message indicating | |
1482 | * that the connection has been closed. | |
1483 | */ | |
1484 | if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) { | |
1485 | snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host); | |
1486 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
1487 | } | |
1488 | ||
5260325f | 1489 | /* Output any buffered data for stdout. */ |
89aa792b | 1490 | while (buffer_len(&stdout_buffer) > 0) { |
1491 | len = write(fileno(stdout), buffer_ptr(&stdout_buffer), | |
a408af76 | 1492 | buffer_len(&stdout_buffer)); |
89aa792b | 1493 | if (len <= 0) { |
5260325f | 1494 | error("Write failed flushing stdout buffer."); |
89aa792b | 1495 | break; |
1496 | } | |
5260325f | 1497 | buffer_consume(&stdout_buffer, len); |
cd332296 | 1498 | stdout_bytes += len; |
8efc0c15 | 1499 | } |
5260325f | 1500 | |
1501 | /* Output any buffered data for stderr. */ | |
89aa792b | 1502 | while (buffer_len(&stderr_buffer) > 0) { |
1503 | len = write(fileno(stderr), buffer_ptr(&stderr_buffer), | |
a408af76 | 1504 | buffer_len(&stderr_buffer)); |
89aa792b | 1505 | if (len <= 0) { |
5260325f | 1506 | error("Write failed flushing stderr buffer."); |
89aa792b | 1507 | break; |
1508 | } | |
5260325f | 1509 | buffer_consume(&stderr_buffer, len); |
cd332296 | 1510 | stderr_bytes += len; |
5260325f | 1511 | } |
1512 | ||
5260325f | 1513 | /* Clear and free any buffers. */ |
1514 | memset(buf, 0, sizeof(buf)); | |
1515 | buffer_free(&stdin_buffer); | |
1516 | buffer_free(&stdout_buffer); | |
1517 | buffer_free(&stderr_buffer); | |
1518 | ||
1519 | /* Report bytes transferred, and transfer rates. */ | |
1520 | total_time = get_current_time() - start_time; | |
1521 | debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds", | |
184eed6a | 1522 | stdin_bytes, stdout_bytes, stderr_bytes, total_time); |
5260325f | 1523 | if (total_time > 0) |
1524 | debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f", | |
184eed6a | 1525 | stdin_bytes / total_time, stdout_bytes / total_time, |
1526 | stderr_bytes / total_time); | |
5260325f | 1527 | |
1528 | /* Return the exit status of the program. */ | |
1529 | debug("Exit status %d", exit_status); | |
1530 | return exit_status; | |
8efc0c15 | 1531 | } |
7368a6c8 | 1532 | |
1533 | /*********/ | |
1534 | ||
396c147e | 1535 | static void |
7819b5c3 | 1536 | client_input_stdout_data(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 1537 | { |
1e3b8b07 | 1538 | u_int data_len; |
7368a6c8 | 1539 | char *data = packet_get_string(&data_len); |
95500969 | 1540 | packet_check_eom(); |
7368a6c8 | 1541 | buffer_append(&stdout_buffer, data, data_len); |
7368a6c8 | 1542 | memset(data, 0, data_len); |
1543 | xfree(data); | |
1544 | } | |
396c147e | 1545 | static void |
7819b5c3 | 1546 | client_input_stderr_data(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 1547 | { |
1e3b8b07 | 1548 | u_int data_len; |
7368a6c8 | 1549 | char *data = packet_get_string(&data_len); |
95500969 | 1550 | packet_check_eom(); |
7368a6c8 | 1551 | buffer_append(&stderr_buffer, data, data_len); |
7368a6c8 | 1552 | memset(data, 0, data_len); |
1553 | xfree(data); | |
1554 | } | |
396c147e | 1555 | static void |
7819b5c3 | 1556 | client_input_exit_status(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 1557 | { |
7368a6c8 | 1558 | exit_status = packet_get_int(); |
95500969 | 1559 | packet_check_eom(); |
7368a6c8 | 1560 | /* Acknowledge the exit. */ |
1561 | packet_start(SSH_CMSG_EXIT_CONFIRMATION); | |
1562 | packet_send(); | |
1563 | /* | |
1564 | * Must wait for packet to be sent since we are | |
1565 | * exiting the loop. | |
1566 | */ | |
1567 | packet_write_wait(); | |
1568 | /* Flag that we want to exit. */ | |
1569 | quit_pending = 1; | |
1570 | } | |
c15706e2 | 1571 | static void |
1572 | client_input_agent_open(int type, u_int32_t seq, void *ctxt) | |
1573 | { | |
1574 | Channel *c = NULL; | |
1575 | int remote_id, sock; | |
1576 | ||
1577 | /* Read the remote channel number from the message. */ | |
1578 | remote_id = packet_get_int(); | |
1579 | packet_check_eom(); | |
1580 | ||
1581 | /* | |
1582 | * Get a connection to the local authentication agent (this may again | |
1583 | * get forwarded). | |
1584 | */ | |
1585 | sock = ssh_get_authentication_socket(); | |
1586 | ||
1587 | /* | |
1588 | * If we could not connect the agent, send an error message back to | |
1589 | * the server. This should never happen unless the agent dies, | |
1590 | * because authentication forwarding is only enabled if we have an | |
1591 | * agent. | |
1592 | */ | |
1593 | if (sock >= 0) { | |
1594 | c = channel_new("", SSH_CHANNEL_OPEN, sock, sock, | |
1595 | -1, 0, 0, 0, "authentication agent connection", 1); | |
1596 | c->remote_id = remote_id; | |
1597 | c->force_drain = 1; | |
1598 | } | |
1599 | if (c == NULL) { | |
1600 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
1601 | packet_put_int(remote_id); | |
1602 | } else { | |
1603 | /* Send a confirmation to the remote host. */ | |
1604 | debug("Forwarding authentication connection."); | |
1605 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1606 | packet_put_int(remote_id); | |
1607 | packet_put_int(c->self); | |
1608 | } | |
1609 | packet_send(); | |
1610 | } | |
7368a6c8 | 1611 | |
396c147e | 1612 | static Channel * |
fa08c86b | 1613 | client_request_forwarded_tcpip(const char *request_type, int rchan) |
1614 | { | |
343288b8 | 1615 | Channel *c = NULL; |
fa08c86b | 1616 | char *listen_address, *originator_address; |
1617 | int listen_port, originator_port; | |
719fc62f | 1618 | int sock; |
fa08c86b | 1619 | |
1620 | /* Get rest of the packet */ | |
1621 | listen_address = packet_get_string(NULL); | |
1622 | listen_port = packet_get_int(); | |
1623 | originator_address = packet_get_string(NULL); | |
1624 | originator_port = packet_get_int(); | |
95500969 | 1625 | packet_check_eom(); |
fa08c86b | 1626 | |
1627 | debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d", | |
1628 | listen_address, listen_port, originator_address, originator_port); | |
1629 | ||
b3f8a79c | 1630 | sock = channel_connect_by_listen_address(listen_port); |
719fc62f | 1631 | if (sock < 0) { |
1632 | xfree(originator_address); | |
1633 | xfree(listen_address); | |
1634 | return NULL; | |
1635 | } | |
1636 | c = channel_new("forwarded-tcpip", | |
1637 | SSH_CHANNEL_CONNECTING, sock, sock, -1, | |
1638 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0, | |
0d942eff | 1639 | originator_address, 1); |
fa08c86b | 1640 | xfree(originator_address); |
1641 | xfree(listen_address); | |
1642 | return c; | |
1643 | } | |
1644 | ||
343288b8 | 1645 | static Channel * |
fa08c86b | 1646 | client_request_x11(const char *request_type, int rchan) |
1647 | { | |
1648 | Channel *c = NULL; | |
1649 | char *originator; | |
1650 | int originator_port; | |
719fc62f | 1651 | int sock; |
fa08c86b | 1652 | |
1653 | if (!options.forward_x11) { | |
1654 | error("Warning: ssh server tried X11 forwarding."); | |
1655 | error("Warning: this is probably a break in attempt by a malicious server."); | |
1656 | return NULL; | |
1657 | } | |
1658 | originator = packet_get_string(NULL); | |
1659 | if (datafellows & SSH_BUG_X11FWD) { | |
1660 | debug2("buggy server: x11 request w/o originator_port"); | |
1661 | originator_port = 0; | |
1662 | } else { | |
1663 | originator_port = packet_get_int(); | |
1664 | } | |
95500969 | 1665 | packet_check_eom(); |
fa08c86b | 1666 | /* XXX check permission */ |
865ac82e | 1667 | debug("client_request_x11: request from %s %d", originator, |
1668 | originator_port); | |
719fc62f | 1669 | xfree(originator); |
fa08c86b | 1670 | sock = x11_connect_display(); |
719fc62f | 1671 | if (sock < 0) |
1672 | return NULL; | |
1673 | c = channel_new("x11", | |
1674 | SSH_CHANNEL_X11_OPEN, sock, sock, -1, | |
0d942eff | 1675 | CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1); |
a5f82435 | 1676 | c->force_drain = 1; |
fa08c86b | 1677 | return c; |
1678 | } | |
1679 | ||
343288b8 | 1680 | static Channel * |
fa08c86b | 1681 | client_request_agent(const char *request_type, int rchan) |
1682 | { | |
1683 | Channel *c = NULL; | |
719fc62f | 1684 | int sock; |
fa08c86b | 1685 | |
1686 | if (!options.forward_agent) { | |
1687 | error("Warning: ssh server tried agent forwarding."); | |
1688 | error("Warning: this is probably a break in attempt by a malicious server."); | |
1689 | return NULL; | |
1690 | } | |
1691 | sock = ssh_get_authentication_socket(); | |
719fc62f | 1692 | if (sock < 0) |
1693 | return NULL; | |
1694 | c = channel_new("authentication agent connection", | |
1695 | SSH_CHANNEL_OPEN, sock, sock, -1, | |
1696 | CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0, | |
0d942eff | 1697 | "authentication agent connection", 1); |
a5f82435 | 1698 | c->force_drain = 1; |
fa08c86b | 1699 | return c; |
1700 | } | |
1701 | ||
0b242b12 | 1702 | /* XXXX move to generic input handler */ |
396c147e | 1703 | static void |
7819b5c3 | 1704 | client_input_channel_open(int type, u_int32_t seq, void *ctxt) |
0b242b12 | 1705 | { |
1706 | Channel *c = NULL; | |
1707 | char *ctype; | |
0b242b12 | 1708 | int rchan; |
f91d9a89 | 1709 | u_int rmaxpack, rwindow, len; |
0b242b12 | 1710 | |
1711 | ctype = packet_get_string(&len); | |
1712 | rchan = packet_get_int(); | |
1713 | rwindow = packet_get_int(); | |
1714 | rmaxpack = packet_get_int(); | |
1715 | ||
1d1ffb87 | 1716 | debug("client_input_channel_open: ctype %s rchan %d win %d max %d", |
0b242b12 | 1717 | ctype, rchan, rwindow, rmaxpack); |
1718 | ||
fa08c86b | 1719 | if (strcmp(ctype, "forwarded-tcpip") == 0) { |
1720 | c = client_request_forwarded_tcpip(ctype, rchan); | |
1721 | } else if (strcmp(ctype, "x11") == 0) { | |
1722 | c = client_request_x11(ctype, rchan); | |
1723 | } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) { | |
1724 | c = client_request_agent(ctype, rchan); | |
0b242b12 | 1725 | } |
1726 | /* XXX duplicate : */ | |
1727 | if (c != NULL) { | |
1728 | debug("confirm %s", ctype); | |
1729 | c->remote_id = rchan; | |
1730 | c->remote_window = rwindow; | |
1731 | c->remote_maxpacket = rmaxpack; | |
a01a10dd | 1732 | if (c->type != SSH_CHANNEL_CONNECTING) { |
1733 | packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1734 | packet_put_int(c->remote_id); | |
1735 | packet_put_int(c->self); | |
1736 | packet_put_int(c->local_window); | |
1737 | packet_put_int(c->local_maxpacket); | |
1738 | packet_send(); | |
1739 | } | |
0b242b12 | 1740 | } else { |
1741 | debug("failure %s", ctype); | |
1742 | packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); | |
1743 | packet_put_int(rchan); | |
1744 | packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED); | |
fbe90f7b | 1745 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { |
a01a10dd | 1746 | packet_put_cstring("open failed"); |
fbe90f7b | 1747 | packet_put_cstring(""); |
1748 | } | |
0b242b12 | 1749 | packet_send(); |
1750 | } | |
1751 | xfree(ctype); | |
1752 | } | |
396c147e | 1753 | static void |
7819b5c3 | 1754 | client_input_channel_req(int type, u_int32_t seq, void *ctxt) |
1fc8ccdf | 1755 | { |
1756 | Channel *c = NULL; | |
5e96b616 | 1757 | int exitval, id, reply, success = 0; |
1fc8ccdf | 1758 | char *rtype; |
1759 | ||
1760 | id = packet_get_int(); | |
1761 | rtype = packet_get_string(NULL); | |
1762 | reply = packet_get_char(); | |
1763 | ||
1764 | debug("client_input_channel_req: channel %d rtype %s reply %d", | |
1765 | id, rtype, reply); | |
1766 | ||
13de3560 | 1767 | if (id == -1) { |
1768 | error("client_input_channel_req: request for channel -1"); | |
1769 | } else if ((c = channel_lookup(id)) == NULL) { | |
1fc8ccdf | 1770 | error("client_input_channel_req: channel %d: unknown channel", id); |
1771 | } else if (strcmp(rtype, "exit-status") == 0) { | |
5e96b616 | 1772 | exitval = packet_get_int(); |
1773 | if (id == session_ident) { | |
1774 | success = 1; | |
1775 | exit_status = exitval; | |
1776 | } else if (c->ctl_fd == -1) { | |
1777 | error("client_input_channel_req: unexpected channel %d", | |
1778 | session_ident); | |
1779 | } else { | |
1780 | atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval)); | |
1781 | success = 1; | |
1782 | } | |
95500969 | 1783 | packet_check_eom(); |
1fc8ccdf | 1784 | } |
1785 | if (reply) { | |
1786 | packet_start(success ? | |
1787 | SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE); | |
13de3560 | 1788 | packet_put_int(id); |
1fc8ccdf | 1789 | packet_send(); |
1790 | } | |
1791 | xfree(rtype); | |
1792 | } | |
3d209bbe | 1793 | static void |
1794 | client_input_global_request(int type, u_int32_t seq, void *ctxt) | |
1795 | { | |
1796 | char *rtype; | |
1797 | int want_reply; | |
1798 | int success = 0; | |
1799 | ||
1800 | rtype = packet_get_string(NULL); | |
1801 | want_reply = packet_get_char(); | |
5d8d32a3 | 1802 | debug("client_input_global_request: rtype %s want_reply %d", |
1803 | rtype, want_reply); | |
3d209bbe | 1804 | if (want_reply) { |
1805 | packet_start(success ? | |
1806 | SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE); | |
1807 | packet_send(); | |
1808 | packet_write_wait(); | |
1809 | } | |
1810 | xfree(rtype); | |
1811 | } | |
0b242b12 | 1812 | |
5e96b616 | 1813 | void |
f2107e97 | 1814 | client_session2_setup(int id, int want_tty, int want_subsystem, |
1786be35 | 1815 | const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env, |
5e96b616 | 1816 | dispatch_fn *subsys_repl) |
1817 | { | |
1818 | int len; | |
2c9a4d41 | 1819 | Channel *c = NULL; |
5e96b616 | 1820 | |
1821 | debug2("%s: id %d", __func__, id); | |
1822 | ||
2c9a4d41 | 1823 | if ((c = channel_lookup(id)) == NULL) |
1824 | fatal("client_session2_setup: channel %d: unknown channel", id); | |
1825 | ||
5e96b616 | 1826 | if (want_tty) { |
1827 | struct winsize ws; | |
1828 | struct termios tio; | |
1829 | ||
1830 | /* Store window size in the packet. */ | |
1831 | if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0) | |
1832 | memset(&ws, 0, sizeof(ws)); | |
1833 | ||
1834 | channel_request_start(id, "pty-req", 0); | |
1835 | packet_put_cstring(term != NULL ? term : ""); | |
1836 | packet_put_int(ws.ws_col); | |
1837 | packet_put_int(ws.ws_row); | |
1838 | packet_put_int(ws.ws_xpixel); | |
1839 | packet_put_int(ws.ws_ypixel); | |
1840 | tio = get_saved_tio(); | |
1841 | tty_make_modes(-1, tiop != NULL ? tiop : &tio); | |
1842 | packet_send(); | |
1843 | /* XXX wait for reply */ | |
2c9a4d41 | 1844 | c->client_tty = 1; |
5e96b616 | 1845 | } |
1846 | ||
1847 | /* Transfer any environment variables from client to server */ | |
1786be35 | 1848 | if (options.num_send_env != 0 && env != NULL) { |
5e96b616 | 1849 | int i, j, matched; |
5e96b616 | 1850 | char *name, *val; |
1851 | ||
1852 | debug("Sending environment."); | |
1786be35 | 1853 | for (i = 0; env[i] != NULL; i++) { |
5e96b616 | 1854 | /* Split */ |
1786be35 | 1855 | name = xstrdup(env[i]); |
5e96b616 | 1856 | if ((val = strchr(name, '=')) == NULL) { |
1857 | free(name); | |
1858 | continue; | |
1859 | } | |
1860 | *val++ = '\0'; | |
1861 | ||
1862 | matched = 0; | |
1863 | for (j = 0; j < options.num_send_env; j++) { | |
1864 | if (match_pattern(name, options.send_env[j])) { | |
1865 | matched = 1; | |
1866 | break; | |
1867 | } | |
1868 | } | |
1869 | if (!matched) { | |
1870 | debug3("Ignored env %s", name); | |
1871 | free(name); | |
1872 | continue; | |
1873 | } | |
1874 | ||
1875 | debug("Sending env %s = %s", name, val); | |
1876 | channel_request_start(id, "env", 0); | |
1877 | packet_put_cstring(name); | |
1878 | packet_put_cstring(val); | |
1879 | packet_send(); | |
1880 | free(name); | |
1881 | } | |
1882 | } | |
1883 | ||
1884 | len = buffer_len(cmd); | |
1885 | if (len > 0) { | |
1886 | if (len > 900) | |
1887 | len = 900; | |
1888 | if (want_subsystem) { | |
1889 | debug("Sending subsystem: %.*s", len, (u_char*)buffer_ptr(cmd)); | |
1890 | channel_request_start(id, "subsystem", subsys_repl != NULL); | |
1891 | if (subsys_repl != NULL) { | |
1892 | /* register callback for reply */ | |
1893 | /* XXX we assume that client_loop has already been called */ | |
1894 | dispatch_set(SSH2_MSG_CHANNEL_FAILURE, subsys_repl); | |
1895 | dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, subsys_repl); | |
1896 | } | |
1897 | } else { | |
1898 | debug("Sending command: %.*s", len, (u_char*)buffer_ptr(cmd)); | |
1899 | channel_request_start(id, "exec", 0); | |
1900 | } | |
1901 | packet_put_string(buffer_ptr(cmd), buffer_len(cmd)); | |
1902 | packet_send(); | |
1903 | } else { | |
1904 | channel_request_start(id, "shell", 0); | |
1905 | packet_send(); | |
1906 | } | |
1907 | } | |
1908 | ||
396c147e | 1909 | static void |
5ca51e19 | 1910 | client_init_dispatch_20(void) |
8ce64345 | 1911 | { |
7a37c112 | 1912 | dispatch_init(&dispatch_protocol_error); |
e0ae8728 | 1913 | |
8ce64345 | 1914 | dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose); |
1915 | dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data); | |
1916 | dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof); | |
1917 | dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data); | |
0b242b12 | 1918 | dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open); |
8ce64345 | 1919 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); |
1920 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); | |
1fc8ccdf | 1921 | dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req); |
8ce64345 | 1922 | dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust); |
3d209bbe | 1923 | dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request); |
7a37c112 | 1924 | |
1925 | /* rekeying */ | |
1926 | dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit); | |
e0ae8728 | 1927 | |
1928 | /* global request reply messages */ | |
1929 | dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply); | |
1930 | dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply); | |
8ce64345 | 1931 | } |
396c147e | 1932 | static void |
5ca51e19 | 1933 | client_init_dispatch_13(void) |
7368a6c8 | 1934 | { |
1935 | dispatch_init(NULL); | |
1936 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close); | |
1937 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation); | |
1938 | dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data); | |
7368a6c8 | 1939 | dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); |
1940 | dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); | |
1941 | dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open); | |
7368a6c8 | 1942 | dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status); |
1943 | dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data); | |
1944 | dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data); | |
a22aff1f | 1945 | |
1946 | dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ? | |
c15706e2 | 1947 | &client_input_agent_open : &deny_input_open); |
a22aff1f | 1948 | dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ? |
1949 | &x11_input_open : &deny_input_open); | |
7368a6c8 | 1950 | } |
396c147e | 1951 | static void |
5ca51e19 | 1952 | client_init_dispatch_15(void) |
7368a6c8 | 1953 | { |
1954 | client_init_dispatch_13(); | |
1955 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof); | |
1956 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose); | |
1957 | } | |
eea46d13 | 1958 | static void |
5ca51e19 | 1959 | client_init_dispatch(void) |
7368a6c8 | 1960 | { |
8ce64345 | 1961 | if (compat20) |
1962 | client_init_dispatch_20(); | |
1963 | else if (compat13) | |
7368a6c8 | 1964 | client_init_dispatch_13(); |
1965 | else | |
1966 | client_init_dispatch_15(); | |
1967 | } | |
82de775c | 1968 | |
1969 | /* client specific fatal cleanup */ | |
1970 | void | |
2362db19 | 1971 | cleanup_exit(int i) |
82de775c | 1972 | { |
82de775c | 1973 | leave_raw_mode(); |
1974 | leave_non_blocking(); | |
5e96b616 | 1975 | if (options.control_path != NULL && control_fd != -1) |
1976 | unlink(options.control_path); | |
2362db19 | 1977 | _exit(i); |
82de775c | 1978 | } |