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3c0ef626 | 1 | /* |
2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> | |
3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
4 | * All rights reserved | |
5 | * The main loop for the interactive session (client side). | |
6 | * | |
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". | |
12 | * | |
13 | * | |
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 | * | |
36 | * | |
37 | * SSH2 support added by Markus Friedl. | |
38 | * Copyright (c) 1999, 2000, 2001 Markus Friedl. All rights reserved. | |
39 | * | |
40 | * Redistribution and use in source and binary forms, with or without | |
41 | * modification, are permitted provided that the following conditions | |
42 | * are met: | |
43 | * 1. Redistributions of source code must retain the above copyright | |
44 | * notice, this list of conditions and the following disclaimer. | |
45 | * 2. Redistributions in binary form must reproduce the above copyright | |
46 | * notice, this list of conditions and the following disclaimer in the | |
47 | * documentation and/or other materials provided with the distribution. | |
48 | * | |
49 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
50 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
51 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
52 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
53 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
54 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
55 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
56 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
57 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
58 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
59 | */ | |
60 | ||
61 | #include "includes.h" | |
34fee935 | 62 | RCSID("$OpenBSD: clientloop.c,v 1.141 2005/07/16 01:35:24 djm Exp $"); |
3c0ef626 | 63 | |
64 | #include "ssh.h" | |
65 | #include "ssh1.h" | |
66 | #include "ssh2.h" | |
67 | #include "xmalloc.h" | |
68 | #include "packet.h" | |
69 | #include "buffer.h" | |
70 | #include "compat.h" | |
71 | #include "channels.h" | |
72 | #include "dispatch.h" | |
73 | #include "buffer.h" | |
74 | #include "bufaux.h" | |
75 | #include "key.h" | |
76 | #include "kex.h" | |
77 | #include "log.h" | |
78 | #include "readconf.h" | |
79 | #include "clientloop.h" | |
80 | #include "authfd.h" | |
81 | #include "atomicio.h" | |
1b56ff3d | 82 | #include "sshpty.h" |
3c0ef626 | 83 | #include "misc.h" |
1b56ff3d | 84 | #include "monitor_fdpass.h" |
85 | #include "match.h" | |
86 | #include "msg.h" | |
3c0ef626 | 87 | |
88 | /* import options */ | |
89 | extern Options options; | |
90 | ||
91 | /* Flag indicating that stdin should be redirected from /dev/null. */ | |
92 | extern int stdin_null_flag; | |
93 | ||
416fd2a8 | 94 | /* Flag indicating that no shell has been requested */ |
95 | extern int no_shell_flag; | |
96 | ||
1b56ff3d | 97 | /* Control socket */ |
98 | extern int control_fd; | |
99 | ||
3c0ef626 | 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 | */ | |
105 | extern char *host; | |
106 | ||
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 | */ | |
e9a17296 | 113 | static volatile sig_atomic_t received_window_change_signal = 0; |
114 | static volatile sig_atomic_t received_signal = 0; | |
3c0ef626 | 115 | |
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. */ | |
120 | static int quit_pending; /* Set to non-zero to quit the client loop. */ | |
121 | static int escape_char; /* Escape character. */ | |
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. */ | |
129 | static u_long stdin_bytes, stdout_bytes, stderr_bytes; | |
130 | static u_int buffer_high;/* Soft max buffer size. */ | |
131 | static int connection_in; /* Connection to server (input). */ | |
132 | static int connection_out; /* Connection to server (output). */ | |
133 | static int need_rekeying; /* Set to non-zero if rekeying is requested. */ | |
134 | static int session_closed = 0; /* In SSH2: login session closed. */ | |
416fd2a8 | 135 | static int server_alive_timeouts = 0; |
3c0ef626 | 136 | |
137 | static void client_init_dispatch(void); | |
138 | int session_ident = -1; | |
139 | ||
1b56ff3d | 140 | struct confirm_ctx { |
141 | int want_tty; | |
142 | int want_subsys; | |
34fee935 | 143 | int want_x_fwd; |
144 | int want_agent_fwd; | |
1b56ff3d | 145 | Buffer cmd; |
146 | char *term; | |
147 | struct termios tio; | |
148 | char **env; | |
149 | }; | |
150 | ||
3c0ef626 | 151 | /*XXX*/ |
152 | extern Kex *xxx_kex; | |
153 | ||
1b56ff3d | 154 | void ssh_process_session2_setup(int, int, int, Buffer *); |
155 | ||
3c0ef626 | 156 | /* Restores stdin to blocking mode. */ |
157 | ||
158 | static void | |
159 | leave_non_blocking(void) | |
160 | { | |
161 | if (in_non_blocking_mode) { | |
1b56ff3d | 162 | unset_nonblock(fileno(stdin)); |
3c0ef626 | 163 | in_non_blocking_mode = 0; |
3c0ef626 | 164 | } |
165 | } | |
166 | ||
167 | /* Puts stdin terminal in non-blocking mode. */ | |
168 | ||
169 | static void | |
170 | enter_non_blocking(void) | |
171 | { | |
172 | in_non_blocking_mode = 1; | |
1b56ff3d | 173 | set_nonblock(fileno(stdin)); |
3c0ef626 | 174 | } |
175 | ||
176 | /* | |
177 | * Signal handler for the window change signal (SIGWINCH). This just sets a | |
178 | * flag indicating that the window has changed. | |
179 | */ | |
180 | ||
181 | static void | |
182 | window_change_handler(int sig) | |
183 | { | |
184 | received_window_change_signal = 1; | |
185 | signal(SIGWINCH, window_change_handler); | |
186 | } | |
187 | ||
188 | /* | |
189 | * Signal handler for signals that cause the program to terminate. These | |
190 | * signals must be trapped to restore terminal modes. | |
191 | */ | |
192 | ||
193 | static void | |
194 | signal_handler(int sig) | |
195 | { | |
196 | received_signal = sig; | |
197 | quit_pending = 1; | |
198 | } | |
199 | ||
200 | /* | |
201 | * Returns current time in seconds from Jan 1, 1970 with the maximum | |
202 | * available resolution. | |
203 | */ | |
204 | ||
205 | static double | |
206 | get_current_time(void) | |
207 | { | |
208 | struct timeval tv; | |
209 | gettimeofday(&tv, NULL); | |
210 | return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0; | |
211 | } | |
212 | ||
34fee935 | 213 | #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1" |
214 | void | |
215 | client_x11_get_proto(const char *display, const char *xauth_path, | |
216 | u_int trusted, char **_proto, char **_data) | |
217 | { | |
218 | char cmd[1024]; | |
219 | char line[512]; | |
220 | char xdisplay[512]; | |
221 | static char proto[512], data[512]; | |
222 | FILE *f; | |
223 | int got_data = 0, generated = 0, do_unlink = 0, i; | |
224 | char *xauthdir, *xauthfile; | |
225 | struct stat st; | |
226 | ||
227 | xauthdir = xauthfile = NULL; | |
228 | *_proto = proto; | |
229 | *_data = data; | |
230 | proto[0] = data[0] = '\0'; | |
231 | ||
232 | if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) { | |
233 | debug("No xauth program."); | |
234 | } else { | |
235 | if (display == NULL) { | |
236 | debug("x11_get_proto: DISPLAY not set"); | |
237 | return; | |
238 | } | |
239 | /* | |
240 | * Handle FamilyLocal case where $DISPLAY does | |
241 | * not match an authorization entry. For this we | |
242 | * just try "xauth list unix:displaynum.screennum". | |
243 | * XXX: "localhost" match to determine FamilyLocal | |
244 | * is not perfect. | |
245 | */ | |
246 | if (strncmp(display, "localhost:", 10) == 0) { | |
247 | snprintf(xdisplay, sizeof(xdisplay), "unix:%s", | |
248 | display + 10); | |
249 | display = xdisplay; | |
250 | } | |
251 | if (trusted == 0) { | |
252 | xauthdir = xmalloc(MAXPATHLEN); | |
253 | xauthfile = xmalloc(MAXPATHLEN); | |
254 | strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN); | |
255 | if (mkdtemp(xauthdir) != NULL) { | |
256 | do_unlink = 1; | |
257 | snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile", | |
258 | xauthdir); | |
259 | snprintf(cmd, sizeof(cmd), | |
260 | "%s -f %s generate %s " SSH_X11_PROTO | |
261 | " untrusted timeout 1200 2>" _PATH_DEVNULL, | |
262 | xauth_path, xauthfile, display); | |
263 | debug2("x11_get_proto: %s", cmd); | |
264 | if (system(cmd) == 0) | |
265 | generated = 1; | |
266 | } | |
267 | } | |
268 | snprintf(cmd, sizeof(cmd), | |
269 | "%s %s%s list %s . 2>" _PATH_DEVNULL, | |
270 | xauth_path, | |
271 | generated ? "-f " : "" , | |
272 | generated ? xauthfile : "", | |
273 | display); | |
274 | debug2("x11_get_proto: %s", cmd); | |
275 | f = popen(cmd, "r"); | |
276 | if (f && fgets(line, sizeof(line), f) && | |
277 | sscanf(line, "%*s %511s %511s", proto, data) == 2) | |
278 | got_data = 1; | |
279 | if (f) | |
280 | pclose(f); | |
281 | } | |
282 | ||
283 | if (do_unlink) { | |
284 | unlink(xauthfile); | |
285 | rmdir(xauthdir); | |
286 | } | |
287 | if (xauthdir) | |
288 | xfree(xauthdir); | |
289 | if (xauthfile) | |
290 | xfree(xauthfile); | |
291 | ||
292 | /* | |
293 | * If we didn't get authentication data, just make up some | |
294 | * data. The forwarding code will check the validity of the | |
295 | * response anyway, and substitute this data. The X11 | |
296 | * server, however, will ignore this fake data and use | |
297 | * whatever authentication mechanisms it was using otherwise | |
298 | * for the local connection. | |
299 | */ | |
300 | if (!got_data) { | |
301 | u_int32_t rnd = 0; | |
302 | ||
303 | logit("Warning: No xauth data; " | |
304 | "using fake authentication data for X11 forwarding."); | |
305 | strlcpy(proto, SSH_X11_PROTO, sizeof proto); | |
306 | for (i = 0; i < 16; i++) { | |
307 | if (i % 4 == 0) | |
308 | rnd = arc4random(); | |
309 | snprintf(data + 2 * i, sizeof data - 2 * i, "%02x", | |
310 | rnd & 0xff); | |
311 | rnd >>= 8; | |
312 | } | |
313 | } | |
314 | } | |
315 | ||
3c0ef626 | 316 | /* |
317 | * This is called when the interactive is entered. This checks if there is | |
318 | * an EOF coming on stdin. We must check this explicitly, as select() does | |
319 | * not appear to wake up when redirecting from /dev/null. | |
320 | */ | |
321 | ||
322 | static void | |
323 | client_check_initial_eof_on_stdin(void) | |
324 | { | |
325 | int len; | |
326 | char buf[1]; | |
327 | ||
328 | /* | |
329 | * If standard input is to be "redirected from /dev/null", we simply | |
330 | * mark that we have seen an EOF and send an EOF message to the | |
331 | * server. Otherwise, we try to read a single character; it appears | |
332 | * that for some files, such /dev/null, select() never wakes up for | |
333 | * read for this descriptor, which means that we never get EOF. This | |
334 | * way we will get the EOF if stdin comes from /dev/null or similar. | |
335 | */ | |
336 | if (stdin_null_flag) { | |
337 | /* Fake EOF on stdin. */ | |
338 | debug("Sending eof."); | |
339 | stdin_eof = 1; | |
340 | packet_start(SSH_CMSG_EOF); | |
341 | packet_send(); | |
342 | } else { | |
343 | enter_non_blocking(); | |
344 | ||
345 | /* Check for immediate EOF on stdin. */ | |
346 | len = read(fileno(stdin), buf, 1); | |
347 | if (len == 0) { | |
348 | /* EOF. Record that we have seen it and send EOF to server. */ | |
349 | debug("Sending eof."); | |
350 | stdin_eof = 1; | |
351 | packet_start(SSH_CMSG_EOF); | |
352 | packet_send(); | |
353 | } else if (len > 0) { | |
354 | /* | |
355 | * Got data. We must store the data in the buffer, | |
356 | * and also process it as an escape character if | |
357 | * appropriate. | |
358 | */ | |
359 | if ((u_char) buf[0] == escape_char) | |
360 | escape_pending = 1; | |
361 | else | |
362 | buffer_append(&stdin_buffer, buf, 1); | |
363 | } | |
364 | leave_non_blocking(); | |
365 | } | |
366 | } | |
367 | ||
368 | ||
369 | /* | |
370 | * Make packets from buffered stdin data, and buffer them for sending to the | |
371 | * connection. | |
372 | */ | |
373 | ||
374 | static void | |
375 | client_make_packets_from_stdin_data(void) | |
376 | { | |
377 | u_int len; | |
378 | ||
379 | /* Send buffered stdin data to the server. */ | |
380 | while (buffer_len(&stdin_buffer) > 0 && | |
e9a17296 | 381 | packet_not_very_much_data_to_write()) { |
3c0ef626 | 382 | len = buffer_len(&stdin_buffer); |
383 | /* Keep the packets at reasonable size. */ | |
384 | if (len > packet_get_maxsize()) | |
385 | len = packet_get_maxsize(); | |
386 | packet_start(SSH_CMSG_STDIN_DATA); | |
387 | packet_put_string(buffer_ptr(&stdin_buffer), len); | |
388 | packet_send(); | |
389 | buffer_consume(&stdin_buffer, len); | |
390 | stdin_bytes += len; | |
391 | /* If we have a pending EOF, send it now. */ | |
392 | if (stdin_eof && buffer_len(&stdin_buffer) == 0) { | |
393 | packet_start(SSH_CMSG_EOF); | |
394 | packet_send(); | |
395 | } | |
396 | } | |
397 | } | |
398 | ||
399 | /* | |
400 | * Checks if the client window has changed, and sends a packet about it to | |
401 | * the server if so. The actual change is detected elsewhere (by a software | |
402 | * interrupt on Unix); this just checks the flag and sends a message if | |
403 | * appropriate. | |
404 | */ | |
405 | ||
406 | static void | |
407 | client_check_window_change(void) | |
408 | { | |
409 | struct winsize ws; | |
410 | ||
411 | if (! received_window_change_signal) | |
412 | return; | |
413 | /** XXX race */ | |
414 | received_window_change_signal = 0; | |
415 | ||
3c0ef626 | 416 | debug2("client_check_window_change: changed"); |
417 | ||
418 | if (compat20) { | |
1b56ff3d | 419 | channel_send_window_changes(); |
3c0ef626 | 420 | } else { |
1b56ff3d | 421 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) |
422 | return; | |
3c0ef626 | 423 | packet_start(SSH_CMSG_WINDOW_SIZE); |
424 | packet_put_int(ws.ws_row); | |
425 | packet_put_int(ws.ws_col); | |
426 | packet_put_int(ws.ws_xpixel); | |
427 | packet_put_int(ws.ws_ypixel); | |
428 | packet_send(); | |
429 | } | |
430 | } | |
431 | ||
416fd2a8 | 432 | static void |
433 | client_global_request_reply(int type, u_int32_t seq, void *ctxt) | |
434 | { | |
435 | server_alive_timeouts = 0; | |
436 | client_global_request_reply_fwd(type, seq, ctxt); | |
437 | } | |
438 | ||
439 | static void | |
440 | server_alive_check(void) | |
441 | { | |
442 | if (++server_alive_timeouts > options.server_alive_count_max) | |
443 | packet_disconnect("Timeout, server not responding."); | |
444 | packet_start(SSH2_MSG_GLOBAL_REQUEST); | |
445 | packet_put_cstring("keepalive@openssh.com"); | |
446 | packet_put_char(1); /* boolean: want reply */ | |
447 | packet_send(); | |
448 | } | |
449 | ||
3c0ef626 | 450 | /* |
451 | * Waits until the client can do something (some data becomes available on | |
452 | * one of the file descriptors). | |
453 | */ | |
3c0ef626 | 454 | static void |
455 | client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp, | |
1b56ff3d | 456 | int *maxfdp, u_int *nallocp, int rekeying) |
3c0ef626 | 457 | { |
416fd2a8 | 458 | struct timeval tv, *tvp; |
459 | int ret; | |
460 | ||
3c0ef626 | 461 | /* Add any selections by the channel mechanism. */ |
462 | channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying); | |
463 | ||
464 | if (!compat20) { | |
465 | /* Read from the connection, unless our buffers are full. */ | |
466 | if (buffer_len(&stdout_buffer) < buffer_high && | |
467 | buffer_len(&stderr_buffer) < buffer_high && | |
468 | channel_not_very_much_buffered_data()) | |
469 | FD_SET(connection_in, *readsetp); | |
470 | /* | |
471 | * Read from stdin, unless we have seen EOF or have very much | |
472 | * buffered data to send to the server. | |
473 | */ | |
474 | if (!stdin_eof && packet_not_very_much_data_to_write()) | |
475 | FD_SET(fileno(stdin), *readsetp); | |
476 | ||
477 | /* Select stdout/stderr if have data in buffer. */ | |
478 | if (buffer_len(&stdout_buffer) > 0) | |
479 | FD_SET(fileno(stdout), *writesetp); | |
480 | if (buffer_len(&stderr_buffer) > 0) | |
481 | FD_SET(fileno(stderr), *writesetp); | |
482 | } else { | |
483 | /* channel_prepare_select could have closed the last channel */ | |
484 | if (session_closed && !channel_still_open() && | |
485 | !packet_have_data_to_write()) { | |
486 | /* clear mask since we did not call select() */ | |
487 | memset(*readsetp, 0, *nallocp); | |
488 | memset(*writesetp, 0, *nallocp); | |
489 | return; | |
490 | } else { | |
491 | FD_SET(connection_in, *readsetp); | |
492 | } | |
493 | } | |
494 | ||
495 | /* Select server connection if have data to write to the server. */ | |
496 | if (packet_have_data_to_write()) | |
497 | FD_SET(connection_out, *writesetp); | |
498 | ||
1b56ff3d | 499 | if (control_fd != -1) |
500 | FD_SET(control_fd, *readsetp); | |
501 | ||
3c0ef626 | 502 | /* |
503 | * Wait for something to happen. This will suspend the process until | |
504 | * some selected descriptor can be read, written, or has some other | |
416fd2a8 | 505 | * event pending. |
3c0ef626 | 506 | */ |
507 | ||
416fd2a8 | 508 | if (options.server_alive_interval == 0 || !compat20) |
509 | tvp = NULL; | |
1b56ff3d | 510 | else { |
416fd2a8 | 511 | tv.tv_sec = options.server_alive_interval; |
512 | tv.tv_usec = 0; | |
513 | tvp = &tv; | |
514 | } | |
515 | ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp); | |
516 | if (ret < 0) { | |
3c0ef626 | 517 | char buf[100]; |
518 | ||
519 | /* | |
520 | * We have to clear the select masks, because we return. | |
521 | * We have to return, because the mainloop checks for the flags | |
522 | * set by the signal handlers. | |
523 | */ | |
524 | memset(*readsetp, 0, *nallocp); | |
525 | memset(*writesetp, 0, *nallocp); | |
526 | ||
527 | if (errno == EINTR) | |
528 | return; | |
529 | /* Note: we might still have data in the buffers. */ | |
530 | snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno)); | |
531 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
532 | quit_pending = 1; | |
416fd2a8 | 533 | } else if (ret == 0) |
534 | server_alive_check(); | |
3c0ef626 | 535 | } |
536 | ||
537 | static void | |
538 | client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr) | |
539 | { | |
3c0ef626 | 540 | /* Flush stdout and stderr buffers. */ |
541 | if (buffer_len(bout) > 0) | |
70791e56 | 542 | atomicio(vwrite, fileno(stdout), buffer_ptr(bout), buffer_len(bout)); |
3c0ef626 | 543 | if (buffer_len(berr) > 0) |
70791e56 | 544 | atomicio(vwrite, fileno(stderr), buffer_ptr(berr), buffer_len(berr)); |
3c0ef626 | 545 | |
546 | leave_raw_mode(); | |
547 | ||
548 | /* | |
549 | * Free (and clear) the buffer to reduce the amount of data that gets | |
550 | * written to swap. | |
551 | */ | |
552 | buffer_free(bin); | |
553 | buffer_free(bout); | |
554 | buffer_free(berr); | |
555 | ||
3c0ef626 | 556 | /* Send the suspend signal to the program itself. */ |
557 | kill(getpid(), SIGTSTP); | |
558 | ||
34fee935 | 559 | /* Reset window sizes in case they have changed */ |
560 | received_window_change_signal = 1; | |
3c0ef626 | 561 | |
562 | /* OK, we have been continued by the user. Reinitialize buffers. */ | |
563 | buffer_init(bin); | |
564 | buffer_init(bout); | |
565 | buffer_init(berr); | |
566 | ||
567 | enter_raw_mode(); | |
568 | } | |
569 | ||
570 | static void | |
571 | client_process_net_input(fd_set * readset) | |
572 | { | |
573 | int len; | |
574 | char buf[8192]; | |
575 | ||
576 | /* | |
577 | * Read input from the server, and add any such data to the buffer of | |
578 | * the packet subsystem. | |
579 | */ | |
580 | if (FD_ISSET(connection_in, readset)) { | |
581 | /* Read as much as possible. */ | |
582 | len = read(connection_in, buf, sizeof(buf)); | |
583 | if (len == 0) { | |
584 | /* Received EOF. The remote host has closed the connection. */ | |
585 | snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n", | |
586 | host); | |
587 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
588 | quit_pending = 1; | |
589 | return; | |
590 | } | |
591 | /* | |
592 | * There is a kernel bug on Solaris that causes select to | |
593 | * sometimes wake up even though there is no data available. | |
594 | */ | |
595 | if (len < 0 && (errno == EAGAIN || errno == EINTR)) | |
596 | len = 0; | |
597 | ||
598 | if (len < 0) { | |
599 | /* An error has encountered. Perhaps there is a network problem. */ | |
600 | snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n", | |
601 | host, strerror(errno)); | |
602 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
603 | quit_pending = 1; | |
604 | return; | |
605 | } | |
606 | packet_process_incoming(buf, len); | |
607 | } | |
608 | } | |
609 | ||
1b56ff3d | 610 | static void |
611 | client_subsystem_reply(int type, u_int32_t seq, void *ctxt) | |
612 | { | |
613 | int id; | |
614 | Channel *c; | |
615 | ||
616 | id = packet_get_int(); | |
617 | packet_check_eom(); | |
618 | ||
619 | if ((c = channel_lookup(id)) == NULL) { | |
620 | error("%s: no channel for id %d", __func__, id); | |
621 | return; | |
622 | } | |
623 | ||
624 | if (type == SSH2_MSG_CHANNEL_SUCCESS) | |
625 | debug2("Request suceeded on channel %d", id); | |
626 | else if (type == SSH2_MSG_CHANNEL_FAILURE) { | |
627 | error("Request failed on channel %d", id); | |
628 | channel_free(c); | |
629 | } | |
630 | } | |
631 | ||
632 | static void | |
633 | client_extra_session2_setup(int id, void *arg) | |
634 | { | |
635 | struct confirm_ctx *cctx = arg; | |
34fee935 | 636 | const char *display; |
1b56ff3d | 637 | Channel *c; |
638 | int i; | |
639 | ||
640 | if (cctx == NULL) | |
641 | fatal("%s: cctx == NULL", __func__); | |
642 | if ((c = channel_lookup(id)) == NULL) | |
643 | fatal("%s: no channel for id %d", __func__, id); | |
644 | ||
34fee935 | 645 | display = getenv("DISPLAY"); |
646 | if (cctx->want_x_fwd && options.forward_x11 && display != NULL) { | |
647 | char *proto, *data; | |
648 | /* Get reasonable local authentication information. */ | |
649 | client_x11_get_proto(display, options.xauth_location, | |
650 | options.forward_x11_trusted, &proto, &data); | |
651 | /* Request forwarding with authentication spoofing. */ | |
652 | debug("Requesting X11 forwarding with authentication spoofing."); | |
653 | x11_request_forwarding_with_spoofing(id, display, proto, data); | |
654 | /* XXX wait for reply */ | |
655 | } | |
656 | ||
657 | if (cctx->want_agent_fwd && options.forward_agent) { | |
658 | debug("Requesting authentication agent forwarding."); | |
659 | channel_request_start(id, "auth-agent-req@openssh.com", 0); | |
660 | packet_send(); | |
661 | } | |
662 | ||
1b56ff3d | 663 | client_session2_setup(id, cctx->want_tty, cctx->want_subsys, |
664 | cctx->term, &cctx->tio, c->rfd, &cctx->cmd, cctx->env, | |
665 | client_subsystem_reply); | |
666 | ||
667 | c->confirm_ctx = NULL; | |
668 | buffer_free(&cctx->cmd); | |
669 | xfree(cctx->term); | |
670 | if (cctx->env != NULL) { | |
671 | for (i = 0; cctx->env[i] != NULL; i++) | |
672 | xfree(cctx->env[i]); | |
673 | xfree(cctx->env); | |
674 | } | |
675 | xfree(cctx); | |
676 | } | |
677 | ||
678 | static void | |
679 | client_process_control(fd_set * readset) | |
680 | { | |
681 | Buffer m; | |
682 | Channel *c; | |
34fee935 | 683 | int client_fd, new_fd[3], ver, allowed; |
1b56ff3d | 684 | socklen_t addrlen; |
685 | struct sockaddr_storage addr; | |
686 | struct confirm_ctx *cctx; | |
687 | char *cmd; | |
34fee935 | 688 | u_int i, len, env_len, command, flags; |
1b56ff3d | 689 | uid_t euid; |
690 | gid_t egid; | |
691 | ||
692 | /* | |
693 | * Accept connection on control socket | |
694 | */ | |
695 | if (control_fd == -1 || !FD_ISSET(control_fd, readset)) | |
696 | return; | |
697 | ||
698 | memset(&addr, 0, sizeof(addr)); | |
699 | addrlen = sizeof(addr); | |
700 | if ((client_fd = accept(control_fd, | |
701 | (struct sockaddr*)&addr, &addrlen)) == -1) { | |
702 | error("%s accept: %s", __func__, strerror(errno)); | |
703 | return; | |
704 | } | |
705 | ||
706 | if (getpeereid(client_fd, &euid, &egid) < 0) { | |
707 | error("%s getpeereid failed: %s", __func__, strerror(errno)); | |
708 | close(client_fd); | |
709 | return; | |
710 | } | |
711 | if ((euid != 0) && (getuid() != euid)) { | |
712 | error("control mode uid mismatch: peer euid %u != uid %u", | |
713 | (u_int) euid, (u_int) getuid()); | |
714 | close(client_fd); | |
715 | return; | |
716 | } | |
717 | ||
1b56ff3d | 718 | unset_nonblock(client_fd); |
719 | ||
34fee935 | 720 | /* Read command */ |
1b56ff3d | 721 | buffer_init(&m); |
34fee935 | 722 | if (ssh_msg_recv(client_fd, &m) == -1) { |
723 | error("%s: client msg_recv failed", __func__); | |
724 | close(client_fd); | |
725 | buffer_free(&m); | |
726 | return; | |
727 | } | |
728 | if ((ver = buffer_get_char(&m)) != SSHMUX_VER) { | |
729 | error("%s: wrong client version %d", __func__, ver); | |
730 | buffer_free(&m); | |
731 | close(client_fd); | |
732 | return; | |
733 | } | |
1b56ff3d | 734 | |
34fee935 | 735 | allowed = 1; |
736 | command = buffer_get_int(&m); | |
737 | flags = buffer_get_int(&m); | |
738 | ||
739 | buffer_clear(&m); | |
740 | ||
741 | switch (command) { | |
742 | case SSHMUX_COMMAND_OPEN: | |
743 | if (options.control_master == SSHCTL_MASTER_ASK || | |
744 | options.control_master == SSHCTL_MASTER_AUTO_ASK) | |
745 | allowed = ask_permission("Allow shared connection " | |
746 | "to %s? ", host); | |
747 | /* continue below */ | |
748 | break; | |
749 | case SSHMUX_COMMAND_TERMINATE: | |
750 | if (options.control_master == SSHCTL_MASTER_ASK || | |
751 | options.control_master == SSHCTL_MASTER_AUTO_ASK) | |
752 | allowed = ask_permission("Terminate shared connection " | |
753 | "to %s? ", host); | |
754 | if (allowed) | |
755 | quit_pending = 1; | |
756 | /* FALLTHROUGH */ | |
757 | case SSHMUX_COMMAND_ALIVE_CHECK: | |
758 | /* Reply for SSHMUX_COMMAND_TERMINATE and ALIVE_CHECK */ | |
759 | buffer_clear(&m); | |
760 | buffer_put_int(&m, allowed); | |
761 | buffer_put_int(&m, getpid()); | |
762 | if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) { | |
763 | error("%s: client msg_send failed", __func__); | |
764 | close(client_fd); | |
765 | buffer_free(&m); | |
766 | return; | |
767 | } | |
768 | buffer_free(&m); | |
769 | close(client_fd); | |
770 | return; | |
771 | default: | |
772 | error("Unsupported command %d", command); | |
773 | buffer_free(&m); | |
774 | close(client_fd); | |
775 | return; | |
776 | } | |
777 | ||
778 | /* Reply for SSHMUX_COMMAND_OPEN */ | |
779 | buffer_clear(&m); | |
1b56ff3d | 780 | buffer_put_int(&m, allowed); |
781 | buffer_put_int(&m, getpid()); | |
34fee935 | 782 | if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) { |
1b56ff3d | 783 | error("%s: client msg_send failed", __func__); |
784 | close(client_fd); | |
785 | buffer_free(&m); | |
786 | return; | |
787 | } | |
1b56ff3d | 788 | |
789 | if (!allowed) { | |
790 | error("Refused control connection"); | |
791 | close(client_fd); | |
792 | buffer_free(&m); | |
793 | return; | |
794 | } | |
795 | ||
34fee935 | 796 | buffer_clear(&m); |
1b56ff3d | 797 | if (ssh_msg_recv(client_fd, &m) == -1) { |
798 | error("%s: client msg_recv failed", __func__); | |
799 | close(client_fd); | |
800 | buffer_free(&m); | |
801 | return; | |
802 | } | |
34fee935 | 803 | if ((ver = buffer_get_char(&m)) != SSHMUX_VER) { |
1b56ff3d | 804 | error("%s: wrong client version %d", __func__, ver); |
805 | buffer_free(&m); | |
806 | close(client_fd); | |
807 | return; | |
808 | } | |
809 | ||
810 | cctx = xmalloc(sizeof(*cctx)); | |
811 | memset(cctx, 0, sizeof(*cctx)); | |
34fee935 | 812 | cctx->want_tty = (flags & SSHMUX_FLAG_TTY) != 0; |
813 | cctx->want_subsys = (flags & SSHMUX_FLAG_SUBSYS) != 0; | |
814 | cctx->want_x_fwd = (flags & SSHMUX_FLAG_X11_FWD) != 0; | |
815 | cctx->want_agent_fwd = (flags & SSHMUX_FLAG_AGENT_FWD) != 0; | |
1b56ff3d | 816 | cctx->term = buffer_get_string(&m, &len); |
817 | ||
818 | cmd = buffer_get_string(&m, &len); | |
819 | buffer_init(&cctx->cmd); | |
820 | buffer_append(&cctx->cmd, cmd, strlen(cmd)); | |
821 | ||
822 | env_len = buffer_get_int(&m); | |
823 | env_len = MIN(env_len, 4096); | |
824 | debug3("%s: receiving %d env vars", __func__, env_len); | |
825 | if (env_len != 0) { | |
826 | cctx->env = xmalloc(sizeof(*cctx->env) * (env_len + 1)); | |
827 | for (i = 0; i < env_len; i++) | |
828 | cctx->env[i] = buffer_get_string(&m, &len); | |
829 | cctx->env[i] = NULL; | |
830 | } | |
831 | ||
832 | debug2("%s: accepted tty %d, subsys %d, cmd %s", __func__, | |
833 | cctx->want_tty, cctx->want_subsys, cmd); | |
834 | ||
835 | /* Gather fds from client */ | |
836 | new_fd[0] = mm_receive_fd(client_fd); | |
837 | new_fd[1] = mm_receive_fd(client_fd); | |
838 | new_fd[2] = mm_receive_fd(client_fd); | |
839 | ||
840 | debug2("%s: got fds stdin %d, stdout %d, stderr %d", __func__, | |
841 | new_fd[0], new_fd[1], new_fd[2]); | |
842 | ||
843 | /* Try to pick up ttymodes from client before it goes raw */ | |
844 | if (cctx->want_tty && tcgetattr(new_fd[0], &cctx->tio) == -1) | |
845 | error("%s: tcgetattr: %s", __func__, strerror(errno)); | |
846 | ||
34fee935 | 847 | /* This roundtrip is just for synchronisation of ttymodes */ |
1b56ff3d | 848 | buffer_clear(&m); |
34fee935 | 849 | if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) { |
1b56ff3d | 850 | error("%s: client msg_send failed", __func__); |
851 | close(client_fd); | |
852 | close(new_fd[0]); | |
853 | close(new_fd[1]); | |
854 | close(new_fd[2]); | |
855 | buffer_free(&m); | |
34fee935 | 856 | xfree(cctx->term); |
857 | if (env_len != 0) { | |
858 | for (i = 0; i < env_len; i++) | |
859 | xfree(cctx->env[i]); | |
860 | xfree(cctx->env); | |
861 | } | |
1b56ff3d | 862 | return; |
863 | } | |
864 | buffer_free(&m); | |
865 | ||
866 | /* enable nonblocking unless tty */ | |
867 | if (!isatty(new_fd[0])) | |
868 | set_nonblock(new_fd[0]); | |
869 | if (!isatty(new_fd[1])) | |
870 | set_nonblock(new_fd[1]); | |
871 | if (!isatty(new_fd[2])) | |
872 | set_nonblock(new_fd[2]); | |
873 | ||
874 | set_nonblock(client_fd); | |
875 | ||
876 | c = channel_new("session", SSH_CHANNEL_OPENING, | |
877 | new_fd[0], new_fd[1], new_fd[2], | |
878 | CHAN_SES_WINDOW_DEFAULT, CHAN_SES_PACKET_DEFAULT, | |
879 | CHAN_EXTENDED_WRITE, "client-session", /*nonblock*/0); | |
880 | ||
881 | /* XXX */ | |
882 | c->ctl_fd = client_fd; | |
883 | ||
884 | debug3("%s: channel_new: %d", __func__, c->self); | |
885 | ||
886 | channel_send_open(c->self); | |
887 | channel_register_confirm(c->self, client_extra_session2_setup, cctx); | |
888 | } | |
889 | ||
2980ea68 | 890 | static void |
891 | process_cmdline(void) | |
892 | { | |
893 | void (*handler)(int); | |
34fee935 | 894 | char *s, *cmd, *cancel_host; |
1b56ff3d | 895 | int delete = 0; |
2980ea68 | 896 | int local = 0; |
34fee935 | 897 | u_short cancel_port; |
898 | Forward fwd; | |
2980ea68 | 899 | |
900 | leave_raw_mode(); | |
ff2d7a98 | 901 | handler = signal(SIGINT, SIG_IGN); |
2980ea68 | 902 | cmd = s = read_passphrase("\r\nssh> ", RP_ECHO); |
903 | if (s == NULL) | |
904 | goto out; | |
905 | while (*s && isspace(*s)) | |
906 | s++; | |
1b56ff3d | 907 | if (*s == '-') |
908 | s++; /* Skip cmdline '-', if any */ | |
909 | if (*s == '\0') | |
910 | goto out; | |
911 | ||
912 | if (*s == 'h' || *s == 'H' || *s == '?') { | |
913 | logit("Commands:"); | |
914 | logit(" -Lport:host:hostport Request local forward"); | |
915 | logit(" -Rport:host:hostport Request remote forward"); | |
916 | logit(" -KRhostport Cancel remote forward"); | |
2980ea68 | 917 | goto out; |
1b56ff3d | 918 | } |
919 | ||
920 | if (*s == 'K') { | |
921 | delete = 1; | |
922 | s++; | |
923 | } | |
924 | if (*s != 'L' && *s != 'R') { | |
70791e56 | 925 | logit("Invalid command."); |
2980ea68 | 926 | goto out; |
927 | } | |
1b56ff3d | 928 | if (*s == 'L') |
2980ea68 | 929 | local = 1; |
1b56ff3d | 930 | if (local && delete) { |
931 | logit("Not supported."); | |
932 | goto out; | |
933 | } | |
934 | if ((!local || delete) && !compat20) { | |
70791e56 | 935 | logit("Not supported for SSH protocol version 1."); |
2980ea68 | 936 | goto out; |
937 | } | |
1b56ff3d | 938 | |
939 | s++; | |
2980ea68 | 940 | while (*s && isspace(*s)) |
941 | s++; | |
942 | ||
1b56ff3d | 943 | if (delete) { |
34fee935 | 944 | cancel_port = 0; |
945 | cancel_host = hpdelim(&s); /* may be NULL */ | |
946 | if (s != NULL) { | |
947 | cancel_port = a2port(s); | |
948 | cancel_host = cleanhostname(cancel_host); | |
949 | } else { | |
950 | cancel_port = a2port(cancel_host); | |
951 | cancel_host = NULL; | |
1b56ff3d | 952 | } |
34fee935 | 953 | if (cancel_port == 0) { |
954 | logit("Bad forwarding close port"); | |
1b56ff3d | 955 | goto out; |
956 | } | |
34fee935 | 957 | channel_request_rforward_cancel(cancel_host, cancel_port); |
1b56ff3d | 958 | } else { |
34fee935 | 959 | if (!parse_forward(&fwd, s)) { |
1b56ff3d | 960 | logit("Bad forwarding specification."); |
961 | goto out; | |
962 | } | |
1b56ff3d | 963 | if (local) { |
34fee935 | 964 | if (channel_setup_local_fwd_listener(fwd.listen_host, |
965 | fwd.listen_port, fwd.connect_host, | |
966 | fwd.connect_port, options.gateway_ports) < 0) { | |
1b56ff3d | 967 | logit("Port forwarding failed."); |
968 | goto out; | |
969 | } | |
34fee935 | 970 | } else { |
971 | channel_request_remote_forwarding(fwd.listen_host, | |
972 | fwd.listen_port, fwd.connect_host, | |
973 | fwd.connect_port); | |
974 | } | |
975 | ||
1b56ff3d | 976 | logit("Forwarding port."); |
977 | } | |
978 | ||
2980ea68 | 979 | out: |
980 | signal(SIGINT, handler); | |
981 | enter_raw_mode(); | |
982 | if (cmd) | |
983 | xfree(cmd); | |
984 | } | |
985 | ||
3c0ef626 | 986 | /* process the characters one by one */ |
987 | static int | |
988 | process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len) | |
989 | { | |
990 | char string[1024]; | |
991 | pid_t pid; | |
992 | int bytes = 0; | |
993 | u_int i; | |
994 | u_char ch; | |
995 | char *s; | |
996 | ||
34fee935 | 997 | if (len <= 0) |
998 | return (0); | |
999 | ||
1000 | for (i = 0; i < (u_int)len; i++) { | |
3c0ef626 | 1001 | /* Get one character at a time. */ |
1002 | ch = buf[i]; | |
1003 | ||
1004 | if (escape_pending) { | |
1005 | /* We have previously seen an escape character. */ | |
1006 | /* Clear the flag now. */ | |
1007 | escape_pending = 0; | |
1008 | ||
1009 | /* Process the escaped character. */ | |
1010 | switch (ch) { | |
1011 | case '.': | |
1012 | /* Terminate the connection. */ | |
1013 | snprintf(string, sizeof string, "%c.\r\n", escape_char); | |
1014 | buffer_append(berr, string, strlen(string)); | |
1015 | ||
1016 | quit_pending = 1; | |
1017 | return -1; | |
1018 | ||
1019 | case 'Z' - 64: | |
1020 | /* Suspend the program. */ | |
1021 | /* Print a message to that effect to the user. */ | |
1022 | snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char); | |
1023 | buffer_append(berr, string, strlen(string)); | |
1024 | ||
1025 | /* Restore terminal modes and suspend. */ | |
1026 | client_suspend_self(bin, bout, berr); | |
1027 | ||
1028 | /* We have been continued. */ | |
1029 | continue; | |
1030 | ||
70791e56 | 1031 | case 'B': |
1032 | if (compat20) { | |
1033 | snprintf(string, sizeof string, | |
1034 | "%cB\r\n", escape_char); | |
1035 | buffer_append(berr, string, | |
1036 | strlen(string)); | |
1037 | channel_request_start(session_ident, | |
1038 | "break", 0); | |
1039 | packet_put_int(1000); | |
1040 | packet_send(); | |
1041 | } | |
1042 | continue; | |
1043 | ||
3c0ef626 | 1044 | case 'R': |
1045 | if (compat20) { | |
1046 | if (datafellows & SSH_BUG_NOREKEY) | |
70791e56 | 1047 | logit("Server does not support re-keying"); |
3c0ef626 | 1048 | else |
1049 | need_rekeying = 1; | |
1050 | } | |
1051 | continue; | |
1052 | ||
1053 | case '&': | |
1054 | /* | |
1055 | * Detach the program (continue to serve connections, | |
1056 | * but put in background and no more new connections). | |
1057 | */ | |
1058 | /* Restore tty modes. */ | |
1059 | leave_raw_mode(); | |
1060 | ||
1061 | /* Stop listening for new connections. */ | |
1062 | channel_stop_listening(); | |
1063 | ||
1064 | snprintf(string, sizeof string, | |
1065 | "%c& [backgrounded]\n", escape_char); | |
1066 | buffer_append(berr, string, strlen(string)); | |
1067 | ||
1068 | /* Fork into background. */ | |
1069 | pid = fork(); | |
1070 | if (pid < 0) { | |
1071 | error("fork: %.100s", strerror(errno)); | |
1072 | continue; | |
1073 | } | |
1074 | if (pid != 0) { /* This is the parent. */ | |
1075 | /* The parent just exits. */ | |
1076 | exit(0); | |
1077 | } | |
1078 | /* The child continues serving connections. */ | |
1079 | if (compat20) { | |
1080 | buffer_append(bin, "\004", 1); | |
1081 | /* fake EOF on stdin */ | |
1082 | return -1; | |
1083 | } else if (!stdin_eof) { | |
1084 | /* | |
1085 | * Sending SSH_CMSG_EOF alone does not always appear | |
1086 | * to be enough. So we try to send an EOF character | |
1087 | * first. | |
1088 | */ | |
1089 | packet_start(SSH_CMSG_STDIN_DATA); | |
1090 | packet_put_string("\004", 1); | |
1091 | packet_send(); | |
1092 | /* Close stdin. */ | |
1093 | stdin_eof = 1; | |
1094 | if (buffer_len(bin) == 0) { | |
1095 | packet_start(SSH_CMSG_EOF); | |
1096 | packet_send(); | |
1097 | } | |
1098 | } | |
1099 | continue; | |
1100 | ||
1101 | case '?': | |
1102 | snprintf(string, sizeof string, | |
1103 | "%c?\r\n\ | |
1104 | Supported escape sequences:\r\n\ | |
e54b3d7c | 1105 | %c. - terminate connection\r\n\ |
70791e56 | 1106 | %cB - send a BREAK to the remote system\r\n\ |
e54b3d7c | 1107 | %cC - open a command line\r\n\ |
1108 | %cR - Request rekey (SSH protocol 2 only)\r\n\ | |
1109 | %c^Z - suspend ssh\r\n\ | |
1110 | %c# - list forwarded connections\r\n\ | |
1111 | %c& - background ssh (when waiting for connections to terminate)\r\n\ | |
1112 | %c? - this message\r\n\ | |
1113 | %c%c - send the escape character by typing it twice\r\n\ | |
3c0ef626 | 1114 | (Note that escapes are only recognized immediately after newline.)\r\n", |
e54b3d7c | 1115 | escape_char, escape_char, escape_char, escape_char, |
1116 | escape_char, escape_char, escape_char, escape_char, | |
70791e56 | 1117 | escape_char, escape_char, escape_char); |
3c0ef626 | 1118 | buffer_append(berr, string, strlen(string)); |
1119 | continue; | |
1120 | ||
1121 | case '#': | |
1122 | snprintf(string, sizeof string, "%c#\r\n", escape_char); | |
1123 | buffer_append(berr, string, strlen(string)); | |
1124 | s = channel_open_message(); | |
1125 | buffer_append(berr, s, strlen(s)); | |
1126 | xfree(s); | |
1127 | continue; | |
1128 | ||
2980ea68 | 1129 | case 'C': |
1130 | process_cmdline(); | |
1131 | continue; | |
1132 | ||
3c0ef626 | 1133 | default: |
1134 | if (ch != escape_char) { | |
1135 | buffer_put_char(bin, escape_char); | |
1136 | bytes++; | |
1137 | } | |
1138 | /* Escaped characters fall through here */ | |
1139 | break; | |
1140 | } | |
1141 | } else { | |
1142 | /* | |
1143 | * The previous character was not an escape char. Check if this | |
1144 | * is an escape. | |
1145 | */ | |
1146 | if (last_was_cr && ch == escape_char) { | |
1147 | /* It is. Set the flag and continue to next character. */ | |
1148 | escape_pending = 1; | |
1149 | continue; | |
1150 | } | |
1151 | } | |
1152 | ||
1153 | /* | |
1154 | * Normal character. Record whether it was a newline, | |
1155 | * and append it to the buffer. | |
1156 | */ | |
1157 | last_was_cr = (ch == '\r' || ch == '\n'); | |
1158 | buffer_put_char(bin, ch); | |
1159 | bytes++; | |
1160 | } | |
1161 | return bytes; | |
1162 | } | |
1163 | ||
1164 | static void | |
1165 | client_process_input(fd_set * readset) | |
1166 | { | |
1167 | int len; | |
1168 | char buf[8192]; | |
1169 | ||
1170 | /* Read input from stdin. */ | |
1171 | if (FD_ISSET(fileno(stdin), readset)) { | |
1172 | /* Read as much as possible. */ | |
1173 | len = read(fileno(stdin), buf, sizeof(buf)); | |
1174 | if (len < 0 && (errno == EAGAIN || errno == EINTR)) | |
1175 | return; /* we'll try again later */ | |
1176 | if (len <= 0) { | |
1177 | /* | |
1178 | * Received EOF or error. They are treated | |
1179 | * similarly, except that an error message is printed | |
1180 | * if it was an error condition. | |
1181 | */ | |
1182 | if (len < 0) { | |
1183 | snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno)); | |
1184 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
1185 | } | |
1186 | /* Mark that we have seen EOF. */ | |
1187 | stdin_eof = 1; | |
1188 | /* | |
1189 | * Send an EOF message to the server unless there is | |
1190 | * data in the buffer. If there is data in the | |
1191 | * buffer, no message will be sent now. Code | |
1192 | * elsewhere will send the EOF when the buffer | |
1193 | * becomes empty if stdin_eof is set. | |
1194 | */ | |
1195 | if (buffer_len(&stdin_buffer) == 0) { | |
1196 | packet_start(SSH_CMSG_EOF); | |
1197 | packet_send(); | |
1198 | } | |
1199 | } else if (escape_char == SSH_ESCAPECHAR_NONE) { | |
1200 | /* | |
1201 | * Normal successful read, and no escape character. | |
1202 | * Just append the data to buffer. | |
1203 | */ | |
1204 | buffer_append(&stdin_buffer, buf, len); | |
1205 | } else { | |
1206 | /* | |
1207 | * Normal, successful read. But we have an escape character | |
1208 | * and have to process the characters one by one. | |
1209 | */ | |
1210 | if (process_escapes(&stdin_buffer, &stdout_buffer, | |
1211 | &stderr_buffer, buf, len) == -1) | |
1212 | return; | |
1213 | } | |
1214 | } | |
1215 | } | |
1216 | ||
1217 | static void | |
1218 | client_process_output(fd_set * writeset) | |
1219 | { | |
1220 | int len; | |
1221 | char buf[100]; | |
1222 | ||
1223 | /* Write buffered output to stdout. */ | |
1224 | if (FD_ISSET(fileno(stdout), writeset)) { | |
1225 | /* Write as much data as possible. */ | |
1226 | len = write(fileno(stdout), buffer_ptr(&stdout_buffer), | |
1227 | buffer_len(&stdout_buffer)); | |
1228 | if (len <= 0) { | |
1229 | if (errno == EINTR || errno == EAGAIN) | |
1230 | len = 0; | |
1231 | else { | |
1232 | /* | |
1233 | * An error or EOF was encountered. Put an | |
1234 | * error message to stderr buffer. | |
1235 | */ | |
1236 | snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno)); | |
1237 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
1238 | quit_pending = 1; | |
1239 | return; | |
1240 | } | |
1241 | } | |
1242 | /* Consume printed data from the buffer. */ | |
1243 | buffer_consume(&stdout_buffer, len); | |
1244 | stdout_bytes += len; | |
1245 | } | |
1246 | /* Write buffered output to stderr. */ | |
1247 | if (FD_ISSET(fileno(stderr), writeset)) { | |
1248 | /* Write as much data as possible. */ | |
1249 | len = write(fileno(stderr), buffer_ptr(&stderr_buffer), | |
1250 | buffer_len(&stderr_buffer)); | |
1251 | if (len <= 0) { | |
1252 | if (errno == EINTR || errno == EAGAIN) | |
1253 | len = 0; | |
1254 | else { | |
1255 | /* EOF or error, but can't even print error message. */ | |
1256 | quit_pending = 1; | |
1257 | return; | |
1258 | } | |
1259 | } | |
1260 | /* Consume printed characters from the buffer. */ | |
1261 | buffer_consume(&stderr_buffer, len); | |
1262 | stderr_bytes += len; | |
1263 | } | |
1264 | } | |
1265 | ||
1266 | /* | |
1267 | * Get packets from the connection input buffer, and process them as long as | |
1268 | * there are packets available. | |
1269 | * | |
1270 | * Any unknown packets received during the actual | |
1271 | * session cause the session to terminate. This is | |
1272 | * intended to make debugging easier since no | |
1273 | * confirmations are sent. Any compatible protocol | |
1274 | * extensions must be negotiated during the | |
1275 | * preparatory phase. | |
1276 | */ | |
1277 | ||
1278 | static void | |
1279 | client_process_buffered_input_packets(void) | |
1280 | { | |
1281 | dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL); | |
1282 | } | |
1283 | ||
1284 | /* scan buf[] for '~' before sending data to the peer */ | |
1285 | ||
1286 | static int | |
1287 | simple_escape_filter(Channel *c, char *buf, int len) | |
1288 | { | |
1289 | /* XXX we assume c->extended is writeable */ | |
1290 | return process_escapes(&c->input, &c->output, &c->extended, buf, len); | |
1291 | } | |
1292 | ||
1293 | static void | |
1294 | client_channel_closed(int id, void *arg) | |
1295 | { | |
3c0ef626 | 1296 | channel_cancel_cleanup(id); |
1297 | session_closed = 1; | |
416fd2a8 | 1298 | leave_raw_mode(); |
3c0ef626 | 1299 | } |
1300 | ||
1301 | /* | |
1302 | * Implements the interactive session with the server. This is called after | |
1303 | * the user has been authenticated, and a command has been started on the | |
1304 | * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character | |
1305 | * used as an escape character for terminating or suspending the session. | |
1306 | */ | |
1307 | ||
1308 | int | |
1309 | client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id) | |
1310 | { | |
1311 | fd_set *readset = NULL, *writeset = NULL; | |
1312 | double start_time, total_time; | |
1b56ff3d | 1313 | int max_fd = 0, max_fd2 = 0, len, rekeying = 0; |
1314 | u_int nalloc = 0; | |
3c0ef626 | 1315 | char buf[100]; |
1316 | ||
1317 | debug("Entering interactive session."); | |
1318 | ||
1319 | start_time = get_current_time(); | |
1320 | ||
1321 | /* Initialize variables. */ | |
1322 | escape_pending = 0; | |
1323 | last_was_cr = 1; | |
1324 | exit_status = -1; | |
1325 | stdin_eof = 0; | |
1326 | buffer_high = 64 * 1024; | |
1327 | connection_in = packet_get_connection_in(); | |
1328 | connection_out = packet_get_connection_out(); | |
1329 | max_fd = MAX(connection_in, connection_out); | |
1b56ff3d | 1330 | if (control_fd != -1) |
1331 | max_fd = MAX(max_fd, control_fd); | |
3c0ef626 | 1332 | |
1333 | if (!compat20) { | |
1334 | /* enable nonblocking unless tty */ | |
1335 | if (!isatty(fileno(stdin))) | |
1336 | set_nonblock(fileno(stdin)); | |
1337 | if (!isatty(fileno(stdout))) | |
1338 | set_nonblock(fileno(stdout)); | |
1339 | if (!isatty(fileno(stderr))) | |
1340 | set_nonblock(fileno(stderr)); | |
1341 | max_fd = MAX(max_fd, fileno(stdin)); | |
1342 | max_fd = MAX(max_fd, fileno(stdout)); | |
1343 | max_fd = MAX(max_fd, fileno(stderr)); | |
1344 | } | |
1345 | stdin_bytes = 0; | |
1346 | stdout_bytes = 0; | |
1347 | stderr_bytes = 0; | |
1348 | quit_pending = 0; | |
1349 | escape_char = escape_char_arg; | |
1350 | ||
1351 | /* Initialize buffers. */ | |
1352 | buffer_init(&stdin_buffer); | |
1353 | buffer_init(&stdout_buffer); | |
1354 | buffer_init(&stderr_buffer); | |
1355 | ||
1356 | client_init_dispatch(); | |
1357 | ||
1c14df9e | 1358 | /* |
1359 | * Set signal handlers, (e.g. to restore non-blocking mode) | |
1360 | * but don't overwrite SIG_IGN, matches behaviour from rsh(1) | |
1361 | */ | |
34fee935 | 1362 | if (signal(SIGHUP, SIG_IGN) != SIG_IGN) |
1363 | signal(SIGHUP, signal_handler); | |
1c14df9e | 1364 | if (signal(SIGINT, SIG_IGN) != SIG_IGN) |
1365 | signal(SIGINT, signal_handler); | |
1366 | if (signal(SIGQUIT, SIG_IGN) != SIG_IGN) | |
1367 | signal(SIGQUIT, signal_handler); | |
1368 | if (signal(SIGTERM, SIG_IGN) != SIG_IGN) | |
1369 | signal(SIGTERM, signal_handler); | |
34fee935 | 1370 | signal(SIGWINCH, window_change_handler); |
3c0ef626 | 1371 | |
1372 | if (have_pty) | |
1373 | enter_raw_mode(); | |
1374 | ||
1375 | if (compat20) { | |
1376 | session_ident = ssh2_chan_id; | |
1377 | if (escape_char != SSH_ESCAPECHAR_NONE) | |
1378 | channel_register_filter(session_ident, | |
1379 | simple_escape_filter); | |
1380 | if (session_ident != -1) | |
1381 | channel_register_cleanup(session_ident, | |
1382 | client_channel_closed); | |
1383 | } else { | |
1384 | /* Check if we should immediately send eof on stdin. */ | |
1385 | client_check_initial_eof_on_stdin(); | |
1386 | } | |
1387 | ||
1388 | /* Main loop of the client for the interactive session mode. */ | |
1389 | while (!quit_pending) { | |
1390 | ||
1391 | /* Process buffered packets sent by the server. */ | |
1392 | client_process_buffered_input_packets(); | |
1393 | ||
1394 | if (compat20 && session_closed && !channel_still_open()) | |
1395 | break; | |
1396 | ||
1397 | rekeying = (xxx_kex != NULL && !xxx_kex->done); | |
1398 | ||
1399 | if (rekeying) { | |
1400 | debug("rekeying in progress"); | |
1401 | } else { | |
1402 | /* | |
1403 | * Make packets of buffered stdin data, and buffer | |
1404 | * them for sending to the server. | |
1405 | */ | |
1406 | if (!compat20) | |
1407 | client_make_packets_from_stdin_data(); | |
1408 | ||
1409 | /* | |
1410 | * Make packets from buffered channel data, and | |
1411 | * enqueue them for sending to the server. | |
1412 | */ | |
1413 | if (packet_not_very_much_data_to_write()) | |
1414 | channel_output_poll(); | |
1415 | ||
1416 | /* | |
1417 | * Check if the window size has changed, and buffer a | |
1418 | * message about it to the server if so. | |
1419 | */ | |
1420 | client_check_window_change(); | |
1421 | ||
1422 | if (quit_pending) | |
1423 | break; | |
1424 | } | |
1425 | /* | |
1426 | * Wait until we have something to do (something becomes | |
1427 | * available on one of the descriptors). | |
1428 | */ | |
1429 | max_fd2 = max_fd; | |
1430 | client_wait_until_can_do_something(&readset, &writeset, | |
1431 | &max_fd2, &nalloc, rekeying); | |
1432 | ||
1433 | if (quit_pending) | |
1434 | break; | |
1435 | ||
1436 | /* Do channel operations unless rekeying in progress. */ | |
1437 | if (!rekeying) { | |
1438 | channel_after_select(readset, writeset); | |
70791e56 | 1439 | if (need_rekeying || packet_need_rekeying()) { |
1440 | debug("need rekeying"); | |
3c0ef626 | 1441 | xxx_kex->done = 0; |
1442 | kex_send_kexinit(xxx_kex); | |
1443 | need_rekeying = 0; | |
1444 | } | |
1445 | } | |
1446 | ||
1447 | /* Buffer input from the connection. */ | |
1448 | client_process_net_input(readset); | |
1449 | ||
1b56ff3d | 1450 | /* Accept control connections. */ |
1451 | client_process_control(readset); | |
1452 | ||
3c0ef626 | 1453 | if (quit_pending) |
1454 | break; | |
1455 | ||
1456 | if (!compat20) { | |
1457 | /* Buffer data from stdin */ | |
1458 | client_process_input(readset); | |
1459 | /* | |
1460 | * Process output to stdout and stderr. Output to | |
1461 | * the connection is processed elsewhere (above). | |
1462 | */ | |
1463 | client_process_output(writeset); | |
1464 | } | |
1465 | ||
1466 | /* Send as much buffered packet data as possible to the sender. */ | |
1467 | if (FD_ISSET(connection_out, writeset)) | |
1468 | packet_write_poll(); | |
1469 | } | |
1470 | if (readset) | |
1471 | xfree(readset); | |
1472 | if (writeset) | |
1473 | xfree(writeset); | |
1474 | ||
1475 | /* Terminate the session. */ | |
1476 | ||
1477 | /* Stop watching for window change. */ | |
34fee935 | 1478 | signal(SIGWINCH, SIG_DFL); |
3c0ef626 | 1479 | |
1480 | channel_free_all(); | |
1481 | ||
1482 | if (have_pty) | |
1483 | leave_raw_mode(); | |
1484 | ||
1485 | /* restore blocking io */ | |
1486 | if (!isatty(fileno(stdin))) | |
1487 | unset_nonblock(fileno(stdin)); | |
1488 | if (!isatty(fileno(stdout))) | |
1489 | unset_nonblock(fileno(stdout)); | |
1490 | if (!isatty(fileno(stderr))) | |
1491 | unset_nonblock(fileno(stderr)); | |
1492 | ||
416fd2a8 | 1493 | /* |
1494 | * If there was no shell or command requested, there will be no remote | |
1495 | * exit status to be returned. In that case, clear error code if the | |
1496 | * connection was deliberately terminated at this end. | |
1497 | */ | |
1498 | if (no_shell_flag && received_signal == SIGTERM) { | |
1499 | received_signal = 0; | |
1500 | exit_status = 0; | |
3c0ef626 | 1501 | } |
1502 | ||
416fd2a8 | 1503 | if (received_signal) |
1504 | fatal("Killed by signal %d.", (int) received_signal); | |
1505 | ||
3c0ef626 | 1506 | /* |
1507 | * In interactive mode (with pseudo tty) display a message indicating | |
1508 | * that the connection has been closed. | |
1509 | */ | |
1510 | if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) { | |
1511 | snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host); | |
1512 | buffer_append(&stderr_buffer, buf, strlen(buf)); | |
1513 | } | |
1514 | ||
1515 | /* Output any buffered data for stdout. */ | |
1516 | while (buffer_len(&stdout_buffer) > 0) { | |
1517 | len = write(fileno(stdout), buffer_ptr(&stdout_buffer), | |
1518 | buffer_len(&stdout_buffer)); | |
1519 | if (len <= 0) { | |
1520 | error("Write failed flushing stdout buffer."); | |
1521 | break; | |
1522 | } | |
1523 | buffer_consume(&stdout_buffer, len); | |
1524 | stdout_bytes += len; | |
1525 | } | |
1526 | ||
1527 | /* Output any buffered data for stderr. */ | |
1528 | while (buffer_len(&stderr_buffer) > 0) { | |
1529 | len = write(fileno(stderr), buffer_ptr(&stderr_buffer), | |
1530 | buffer_len(&stderr_buffer)); | |
1531 | if (len <= 0) { | |
1532 | error("Write failed flushing stderr buffer."); | |
1533 | break; | |
1534 | } | |
1535 | buffer_consume(&stderr_buffer, len); | |
1536 | stderr_bytes += len; | |
1537 | } | |
1538 | ||
1539 | /* Clear and free any buffers. */ | |
1540 | memset(buf, 0, sizeof(buf)); | |
1541 | buffer_free(&stdin_buffer); | |
1542 | buffer_free(&stdout_buffer); | |
1543 | buffer_free(&stderr_buffer); | |
1544 | ||
1545 | /* Report bytes transferred, and transfer rates. */ | |
1546 | total_time = get_current_time() - start_time; | |
1547 | debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds", | |
e9a17296 | 1548 | stdin_bytes, stdout_bytes, stderr_bytes, total_time); |
3c0ef626 | 1549 | if (total_time > 0) |
1550 | debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f", | |
e9a17296 | 1551 | stdin_bytes / total_time, stdout_bytes / total_time, |
1552 | stderr_bytes / total_time); | |
3c0ef626 | 1553 | |
1554 | /* Return the exit status of the program. */ | |
1555 | debug("Exit status %d", exit_status); | |
1556 | return exit_status; | |
1557 | } | |
1558 | ||
1559 | /*********/ | |
1560 | ||
1561 | static void | |
e9a17296 | 1562 | client_input_stdout_data(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 1563 | { |
1564 | u_int data_len; | |
1565 | char *data = packet_get_string(&data_len); | |
e9a17296 | 1566 | packet_check_eom(); |
3c0ef626 | 1567 | buffer_append(&stdout_buffer, data, data_len); |
1568 | memset(data, 0, data_len); | |
1569 | xfree(data); | |
1570 | } | |
1571 | static void | |
e9a17296 | 1572 | client_input_stderr_data(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 1573 | { |
1574 | u_int data_len; | |
1575 | char *data = packet_get_string(&data_len); | |
e9a17296 | 1576 | packet_check_eom(); |
3c0ef626 | 1577 | buffer_append(&stderr_buffer, data, data_len); |
1578 | memset(data, 0, data_len); | |
1579 | xfree(data); | |
1580 | } | |
1581 | static void | |
e9a17296 | 1582 | client_input_exit_status(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 1583 | { |
3c0ef626 | 1584 | exit_status = packet_get_int(); |
e9a17296 | 1585 | packet_check_eom(); |
3c0ef626 | 1586 | /* Acknowledge the exit. */ |
1587 | packet_start(SSH_CMSG_EXIT_CONFIRMATION); | |
1588 | packet_send(); | |
1589 | /* | |
1590 | * Must wait for packet to be sent since we are | |
1591 | * exiting the loop. | |
1592 | */ | |
1593 | packet_write_wait(); | |
1594 | /* Flag that we want to exit. */ | |
1595 | quit_pending = 1; | |
1596 | } | |
416fd2a8 | 1597 | static void |
1598 | client_input_agent_open(int type, u_int32_t seq, void *ctxt) | |
1599 | { | |
1600 | Channel *c = NULL; | |
1601 | int remote_id, sock; | |
1602 | ||
1603 | /* Read the remote channel number from the message. */ | |
1604 | remote_id = packet_get_int(); | |
1605 | packet_check_eom(); | |
1606 | ||
1607 | /* | |
1608 | * Get a connection to the local authentication agent (this may again | |
1609 | * get forwarded). | |
1610 | */ | |
1611 | sock = ssh_get_authentication_socket(); | |
1612 | ||
1613 | /* | |
1614 | * If we could not connect the agent, send an error message back to | |
1615 | * the server. This should never happen unless the agent dies, | |
1616 | * because authentication forwarding is only enabled if we have an | |
1617 | * agent. | |
1618 | */ | |
1619 | if (sock >= 0) { | |
1620 | c = channel_new("", SSH_CHANNEL_OPEN, sock, sock, | |
1621 | -1, 0, 0, 0, "authentication agent connection", 1); | |
1622 | c->remote_id = remote_id; | |
1623 | c->force_drain = 1; | |
1624 | } | |
1625 | if (c == NULL) { | |
1626 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
1627 | packet_put_int(remote_id); | |
1628 | } else { | |
1629 | /* Send a confirmation to the remote host. */ | |
1630 | debug("Forwarding authentication connection."); | |
1631 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1632 | packet_put_int(remote_id); | |
1633 | packet_put_int(c->self); | |
1634 | } | |
1635 | packet_send(); | |
1636 | } | |
3c0ef626 | 1637 | |
1638 | static Channel * | |
1639 | client_request_forwarded_tcpip(const char *request_type, int rchan) | |
1640 | { | |
e54b3d7c | 1641 | Channel *c = NULL; |
3c0ef626 | 1642 | char *listen_address, *originator_address; |
1643 | int listen_port, originator_port; | |
1644 | int sock; | |
1645 | ||
1646 | /* Get rest of the packet */ | |
1647 | listen_address = packet_get_string(NULL); | |
1648 | listen_port = packet_get_int(); | |
1649 | originator_address = packet_get_string(NULL); | |
1650 | originator_port = packet_get_int(); | |
e9a17296 | 1651 | packet_check_eom(); |
3c0ef626 | 1652 | |
1653 | debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d", | |
1654 | listen_address, listen_port, originator_address, originator_port); | |
1655 | ||
1656 | sock = channel_connect_by_listen_address(listen_port); | |
1657 | if (sock < 0) { | |
1658 | xfree(originator_address); | |
1659 | xfree(listen_address); | |
1660 | return NULL; | |
1661 | } | |
1662 | c = channel_new("forwarded-tcpip", | |
1663 | SSH_CHANNEL_CONNECTING, sock, sock, -1, | |
1664 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0, | |
70791e56 | 1665 | originator_address, 1); |
3c0ef626 | 1666 | xfree(originator_address); |
1667 | xfree(listen_address); | |
1668 | return c; | |
1669 | } | |
1670 | ||
e54b3d7c | 1671 | static Channel * |
3c0ef626 | 1672 | client_request_x11(const char *request_type, int rchan) |
1673 | { | |
1674 | Channel *c = NULL; | |
1675 | char *originator; | |
1676 | int originator_port; | |
1677 | int sock; | |
1678 | ||
1679 | if (!options.forward_x11) { | |
1680 | error("Warning: ssh server tried X11 forwarding."); | |
1681 | error("Warning: this is probably a break in attempt by a malicious server."); | |
1682 | return NULL; | |
1683 | } | |
1684 | originator = packet_get_string(NULL); | |
1685 | if (datafellows & SSH_BUG_X11FWD) { | |
1686 | debug2("buggy server: x11 request w/o originator_port"); | |
1687 | originator_port = 0; | |
1688 | } else { | |
1689 | originator_port = packet_get_int(); | |
1690 | } | |
e9a17296 | 1691 | packet_check_eom(); |
3c0ef626 | 1692 | /* XXX check permission */ |
1693 | debug("client_request_x11: request from %s %d", originator, | |
1694 | originator_port); | |
1695 | xfree(originator); | |
1696 | sock = x11_connect_display(); | |
1697 | if (sock < 0) | |
1698 | return NULL; | |
1699 | c = channel_new("x11", | |
1700 | SSH_CHANNEL_X11_OPEN, sock, sock, -1, | |
70791e56 | 1701 | CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1); |
3c0ef626 | 1702 | c->force_drain = 1; |
1703 | return c; | |
1704 | } | |
1705 | ||
e54b3d7c | 1706 | static Channel * |
3c0ef626 | 1707 | client_request_agent(const char *request_type, int rchan) |
1708 | { | |
1709 | Channel *c = NULL; | |
1710 | int sock; | |
1711 | ||
1712 | if (!options.forward_agent) { | |
1713 | error("Warning: ssh server tried agent forwarding."); | |
1714 | error("Warning: this is probably a break in attempt by a malicious server."); | |
1715 | return NULL; | |
1716 | } | |
1717 | sock = ssh_get_authentication_socket(); | |
1718 | if (sock < 0) | |
1719 | return NULL; | |
1720 | c = channel_new("authentication agent connection", | |
1721 | SSH_CHANNEL_OPEN, sock, sock, -1, | |
1722 | CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0, | |
70791e56 | 1723 | "authentication agent connection", 1); |
3c0ef626 | 1724 | c->force_drain = 1; |
1725 | return c; | |
1726 | } | |
1727 | ||
1728 | /* XXXX move to generic input handler */ | |
1729 | static void | |
e9a17296 | 1730 | client_input_channel_open(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 1731 | { |
1732 | Channel *c = NULL; | |
1733 | char *ctype; | |
3c0ef626 | 1734 | int rchan; |
ff2d7a98 | 1735 | u_int rmaxpack, rwindow, len; |
3c0ef626 | 1736 | |
1737 | ctype = packet_get_string(&len); | |
1738 | rchan = packet_get_int(); | |
1739 | rwindow = packet_get_int(); | |
1740 | rmaxpack = packet_get_int(); | |
1741 | ||
1742 | debug("client_input_channel_open: ctype %s rchan %d win %d max %d", | |
1743 | ctype, rchan, rwindow, rmaxpack); | |
1744 | ||
1745 | if (strcmp(ctype, "forwarded-tcpip") == 0) { | |
1746 | c = client_request_forwarded_tcpip(ctype, rchan); | |
1747 | } else if (strcmp(ctype, "x11") == 0) { | |
1748 | c = client_request_x11(ctype, rchan); | |
1749 | } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) { | |
1750 | c = client_request_agent(ctype, rchan); | |
1751 | } | |
1752 | /* XXX duplicate : */ | |
1753 | if (c != NULL) { | |
1754 | debug("confirm %s", ctype); | |
1755 | c->remote_id = rchan; | |
1756 | c->remote_window = rwindow; | |
1757 | c->remote_maxpacket = rmaxpack; | |
1758 | if (c->type != SSH_CHANNEL_CONNECTING) { | |
1759 | packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1760 | packet_put_int(c->remote_id); | |
1761 | packet_put_int(c->self); | |
1762 | packet_put_int(c->local_window); | |
1763 | packet_put_int(c->local_maxpacket); | |
1764 | packet_send(); | |
1765 | } | |
1766 | } else { | |
1767 | debug("failure %s", ctype); | |
1768 | packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); | |
1769 | packet_put_int(rchan); | |
1770 | packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED); | |
1771 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { | |
1772 | packet_put_cstring("open failed"); | |
1773 | packet_put_cstring(""); | |
1774 | } | |
1775 | packet_send(); | |
1776 | } | |
1777 | xfree(ctype); | |
1778 | } | |
1779 | static void | |
e9a17296 | 1780 | client_input_channel_req(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 1781 | { |
1782 | Channel *c = NULL; | |
1b56ff3d | 1783 | int exitval, id, reply, success = 0; |
3c0ef626 | 1784 | char *rtype; |
1785 | ||
1786 | id = packet_get_int(); | |
1787 | rtype = packet_get_string(NULL); | |
1788 | reply = packet_get_char(); | |
1789 | ||
1790 | debug("client_input_channel_req: channel %d rtype %s reply %d", | |
1791 | id, rtype, reply); | |
1792 | ||
1b56ff3d | 1793 | if (id == -1) { |
1794 | error("client_input_channel_req: request for channel -1"); | |
1795 | } else if ((c = channel_lookup(id)) == NULL) { | |
3c0ef626 | 1796 | error("client_input_channel_req: channel %d: unknown channel", id); |
1797 | } else if (strcmp(rtype, "exit-status") == 0) { | |
1b56ff3d | 1798 | exitval = packet_get_int(); |
1799 | if (id == session_ident) { | |
1800 | success = 1; | |
1801 | exit_status = exitval; | |
1802 | } else if (c->ctl_fd == -1) { | |
1803 | error("client_input_channel_req: unexpected channel %d", | |
1804 | session_ident); | |
1805 | } else { | |
1806 | atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval)); | |
1807 | success = 1; | |
1808 | } | |
e9a17296 | 1809 | packet_check_eom(); |
3c0ef626 | 1810 | } |
1811 | if (reply) { | |
1812 | packet_start(success ? | |
1813 | SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE); | |
1b56ff3d | 1814 | packet_put_int(id); |
3c0ef626 | 1815 | packet_send(); |
1816 | } | |
1817 | xfree(rtype); | |
1818 | } | |
e9a17296 | 1819 | static void |
1820 | client_input_global_request(int type, u_int32_t seq, void *ctxt) | |
1821 | { | |
1822 | char *rtype; | |
1823 | int want_reply; | |
1824 | int success = 0; | |
1825 | ||
1826 | rtype = packet_get_string(NULL); | |
1827 | want_reply = packet_get_char(); | |
416fd2a8 | 1828 | debug("client_input_global_request: rtype %s want_reply %d", |
1829 | rtype, want_reply); | |
e9a17296 | 1830 | if (want_reply) { |
1831 | packet_start(success ? | |
1832 | SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE); | |
1833 | packet_send(); | |
1834 | packet_write_wait(); | |
1835 | } | |
1836 | xfree(rtype); | |
1837 | } | |
3c0ef626 | 1838 | |
1b56ff3d | 1839 | void |
1840 | client_session2_setup(int id, int want_tty, int want_subsystem, | |
1841 | const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env, | |
1842 | dispatch_fn *subsys_repl) | |
1843 | { | |
1844 | int len; | |
34fee935 | 1845 | Channel *c = NULL; |
1b56ff3d | 1846 | |
1847 | debug2("%s: id %d", __func__, id); | |
1848 | ||
34fee935 | 1849 | if ((c = channel_lookup(id)) == NULL) |
1850 | fatal("client_session2_setup: channel %d: unknown channel", id); | |
1851 | ||
1b56ff3d | 1852 | if (want_tty) { |
1853 | struct winsize ws; | |
1854 | struct termios tio; | |
1855 | ||
1856 | /* Store window size in the packet. */ | |
1857 | if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0) | |
1858 | memset(&ws, 0, sizeof(ws)); | |
1859 | ||
1860 | channel_request_start(id, "pty-req", 0); | |
1861 | packet_put_cstring(term != NULL ? term : ""); | |
1862 | packet_put_int(ws.ws_col); | |
1863 | packet_put_int(ws.ws_row); | |
1864 | packet_put_int(ws.ws_xpixel); | |
1865 | packet_put_int(ws.ws_ypixel); | |
1866 | tio = get_saved_tio(); | |
1867 | tty_make_modes(-1, tiop != NULL ? tiop : &tio); | |
1868 | packet_send(); | |
1869 | /* XXX wait for reply */ | |
34fee935 | 1870 | c->client_tty = 1; |
1b56ff3d | 1871 | } |
1872 | ||
1873 | /* Transfer any environment variables from client to server */ | |
1874 | if (options.num_send_env != 0 && env != NULL) { | |
1875 | int i, j, matched; | |
1876 | char *name, *val; | |
1877 | ||
1878 | debug("Sending environment."); | |
1879 | for (i = 0; env[i] != NULL; i++) { | |
1880 | /* Split */ | |
1881 | name = xstrdup(env[i]); | |
1882 | if ((val = strchr(name, '=')) == NULL) { | |
1883 | free(name); | |
1884 | continue; | |
1885 | } | |
1886 | *val++ = '\0'; | |
1887 | ||
1888 | matched = 0; | |
1889 | for (j = 0; j < options.num_send_env; j++) { | |
1890 | if (match_pattern(name, options.send_env[j])) { | |
1891 | matched = 1; | |
1892 | break; | |
1893 | } | |
1894 | } | |
1895 | if (!matched) { | |
1896 | debug3("Ignored env %s", name); | |
1897 | free(name); | |
1898 | continue; | |
1899 | } | |
1900 | ||
1901 | debug("Sending env %s = %s", name, val); | |
1902 | channel_request_start(id, "env", 0); | |
1903 | packet_put_cstring(name); | |
1904 | packet_put_cstring(val); | |
1905 | packet_send(); | |
1906 | free(name); | |
1907 | } | |
1908 | } | |
1909 | ||
1910 | len = buffer_len(cmd); | |
1911 | if (len > 0) { | |
1912 | if (len > 900) | |
1913 | len = 900; | |
1914 | if (want_subsystem) { | |
1915 | debug("Sending subsystem: %.*s", len, (u_char*)buffer_ptr(cmd)); | |
1916 | channel_request_start(id, "subsystem", subsys_repl != NULL); | |
1917 | if (subsys_repl != NULL) { | |
1918 | /* register callback for reply */ | |
1919 | /* XXX we assume that client_loop has already been called */ | |
1920 | dispatch_set(SSH2_MSG_CHANNEL_FAILURE, subsys_repl); | |
1921 | dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, subsys_repl); | |
1922 | } | |
1923 | } else { | |
1924 | debug("Sending command: %.*s", len, (u_char*)buffer_ptr(cmd)); | |
1925 | channel_request_start(id, "exec", 0); | |
1926 | } | |
1927 | packet_put_string(buffer_ptr(cmd), buffer_len(cmd)); | |
1928 | packet_send(); | |
1929 | } else { | |
1930 | channel_request_start(id, "shell", 0); | |
1931 | packet_send(); | |
1932 | } | |
1933 | } | |
1934 | ||
3c0ef626 | 1935 | static void |
1936 | client_init_dispatch_20(void) | |
1937 | { | |
1938 | dispatch_init(&dispatch_protocol_error); | |
2980ea68 | 1939 | |
3c0ef626 | 1940 | dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose); |
1941 | dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data); | |
1942 | dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof); | |
1943 | dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data); | |
1944 | dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open); | |
1945 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); | |
1946 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); | |
1947 | dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req); | |
1948 | dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust); | |
e9a17296 | 1949 | dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request); |
3c0ef626 | 1950 | |
1951 | /* rekeying */ | |
1952 | dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit); | |
2980ea68 | 1953 | |
1954 | /* global request reply messages */ | |
1955 | dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply); | |
1956 | dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply); | |
3c0ef626 | 1957 | } |
1958 | static void | |
1959 | client_init_dispatch_13(void) | |
1960 | { | |
1961 | dispatch_init(NULL); | |
1962 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close); | |
1963 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation); | |
1964 | dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data); | |
1965 | dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); | |
1966 | dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); | |
1967 | dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open); | |
1968 | dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status); | |
1969 | dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data); | |
1970 | dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data); | |
1971 | ||
1972 | dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ? | |
416fd2a8 | 1973 | &client_input_agent_open : &deny_input_open); |
3c0ef626 | 1974 | dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ? |
1975 | &x11_input_open : &deny_input_open); | |
1976 | } | |
1977 | static void | |
1978 | client_init_dispatch_15(void) | |
1979 | { | |
1980 | client_init_dispatch_13(); | |
1981 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof); | |
1982 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose); | |
1983 | } | |
1984 | static void | |
1985 | client_init_dispatch(void) | |
1986 | { | |
1987 | if (compat20) | |
1988 | client_init_dispatch_20(); | |
1989 | else if (compat13) | |
1990 | client_init_dispatch_13(); | |
1991 | else | |
1992 | client_init_dispatch_15(); | |
1993 | } | |
416fd2a8 | 1994 | |
1995 | /* client specific fatal cleanup */ | |
1996 | void | |
1997 | cleanup_exit(int i) | |
1998 | { | |
1999 | leave_raw_mode(); | |
2000 | leave_non_blocking(); | |
1b56ff3d | 2001 | if (options.control_path != NULL && control_fd != -1) |
2002 | unlink(options.control_path); | |
416fd2a8 | 2003 | _exit(i); |
2004 | } |