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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 | * Server main loop for handling the interactive session. | |
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 | * SSH2 support by Markus Friedl. | |
14 | * Copyright (c) 2000, 2001 Markus Friedl. 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 | #include "includes.h" | |
08822d99 | 38 | RCSID("$OpenBSD: serverloop.c,v 1.124 2005/12/13 15:03:02 reyk Exp $"); |
3c0ef626 | 39 | |
40 | #include "xmalloc.h" | |
41 | #include "packet.h" | |
42 | #include "buffer.h" | |
43 | #include "log.h" | |
44 | #include "servconf.h" | |
473db5ab | 45 | #include "canohost.h" |
3c0ef626 | 46 | #include "sshpty.h" |
47 | #include "channels.h" | |
48 | #include "compat.h" | |
49 | #include "ssh1.h" | |
50 | #include "ssh2.h" | |
51 | #include "auth.h" | |
52 | #include "session.h" | |
53 | #include "dispatch.h" | |
54 | #include "auth-options.h" | |
55 | #include "serverloop.h" | |
56 | #include "misc.h" | |
57 | #include "kex.h" | |
58 | ||
59 | extern ServerOptions options; | |
60 | ||
61 | /* XXX */ | |
62 | extern Kex *xxx_kex; | |
473db5ab | 63 | extern Authctxt *the_authctxt; |
08822d99 | 64 | extern int use_privsep; |
3c0ef626 | 65 | |
66 | static Buffer stdin_buffer; /* Buffer for stdin data. */ | |
67 | static Buffer stdout_buffer; /* Buffer for stdout data. */ | |
68 | static Buffer stderr_buffer; /* Buffer for stderr data. */ | |
69 | static int fdin; /* Descriptor for stdin (for writing) */ | |
70 | static int fdout; /* Descriptor for stdout (for reading); | |
71 | May be same number as fdin. */ | |
72 | static int fderr; /* Descriptor for stderr. May be -1. */ | |
73 | static long stdin_bytes = 0; /* Number of bytes written to stdin. */ | |
74 | static long stdout_bytes = 0; /* Number of stdout bytes sent to client. */ | |
75 | static long stderr_bytes = 0; /* Number of stderr bytes sent to client. */ | |
76 | static long fdout_bytes = 0; /* Number of stdout bytes read from program. */ | |
77 | static int stdin_eof = 0; /* EOF message received from client. */ | |
78 | static int fdout_eof = 0; /* EOF encountered reading from fdout. */ | |
79 | static int fderr_eof = 0; /* EOF encountered readung from fderr. */ | |
80 | static int fdin_is_tty = 0; /* fdin points to a tty. */ | |
81 | static int connection_in; /* Connection to client (input). */ | |
82 | static int connection_out; /* Connection to client (output). */ | |
83 | static int connection_closed = 0; /* Connection to client closed. */ | |
84 | static u_int buffer_high; /* "Soft" max buffer size. */ | |
85 | static int client_alive_timeouts = 0; | |
86 | ||
87 | /* | |
88 | * This SIGCHLD kludge is used to detect when the child exits. The server | |
89 | * will exit after that, as soon as forwarded connections have terminated. | |
90 | */ | |
91 | ||
473db5ab | 92 | static volatile sig_atomic_t child_terminated = 0; /* The child has terminated. */ |
3c0ef626 | 93 | |
08822d99 | 94 | /* Cleanup on signals (!use_privsep case only) */ |
95 | static volatile sig_atomic_t received_sigterm = 0; | |
96 | ||
3c0ef626 | 97 | /* prototypes */ |
98 | static void server_init_dispatch(void); | |
99 | ||
473db5ab | 100 | /* |
101 | * we write to this pipe if a SIGCHLD is caught in order to avoid | |
102 | * the race between select() and child_terminated | |
103 | */ | |
104 | static int notify_pipe[2]; | |
105 | static void | |
106 | notify_setup(void) | |
107 | { | |
108 | if (pipe(notify_pipe) < 0) { | |
109 | error("pipe(notify_pipe) failed %s", strerror(errno)); | |
110 | } else if ((fcntl(notify_pipe[0], F_SETFD, 1) == -1) || | |
111 | (fcntl(notify_pipe[1], F_SETFD, 1) == -1)) { | |
112 | error("fcntl(notify_pipe, F_SETFD) failed %s", strerror(errno)); | |
113 | close(notify_pipe[0]); | |
114 | close(notify_pipe[1]); | |
115 | } else { | |
116 | set_nonblock(notify_pipe[0]); | |
117 | set_nonblock(notify_pipe[1]); | |
118 | return; | |
119 | } | |
120 | notify_pipe[0] = -1; /* read end */ | |
121 | notify_pipe[1] = -1; /* write end */ | |
122 | } | |
123 | static void | |
124 | notify_parent(void) | |
125 | { | |
126 | if (notify_pipe[1] != -1) | |
127 | write(notify_pipe[1], "", 1); | |
128 | } | |
129 | static void | |
130 | notify_prepare(fd_set *readset) | |
131 | { | |
132 | if (notify_pipe[0] != -1) | |
133 | FD_SET(notify_pipe[0], readset); | |
134 | } | |
135 | static void | |
136 | notify_done(fd_set *readset) | |
137 | { | |
138 | char c; | |
139 | ||
140 | if (notify_pipe[0] != -1 && FD_ISSET(notify_pipe[0], readset)) | |
141 | while (read(notify_pipe[0], &c, 1) != -1) | |
142 | debug2("notify_done: reading"); | |
143 | } | |
144 | ||
3c0ef626 | 145 | static void |
146 | sigchld_handler(int sig) | |
147 | { | |
148 | int save_errno = errno; | |
149 | debug("Received SIGCHLD."); | |
150 | child_terminated = 1; | |
473db5ab | 151 | #ifndef _UNICOS |
3c0ef626 | 152 | mysignal(SIGCHLD, sigchld_handler); |
473db5ab | 153 | #endif |
154 | notify_parent(); | |
3c0ef626 | 155 | errno = save_errno; |
156 | } | |
157 | ||
08822d99 | 158 | static void |
159 | sigterm_handler(int sig) | |
160 | { | |
161 | received_sigterm = sig; | |
162 | } | |
163 | ||
3c0ef626 | 164 | /* |
165 | * Make packets from buffered stderr data, and buffer it for sending | |
166 | * to the client. | |
167 | */ | |
168 | static void | |
169 | make_packets_from_stderr_data(void) | |
170 | { | |
473db5ab | 171 | u_int len; |
3c0ef626 | 172 | |
173 | /* Send buffered stderr data to the client. */ | |
174 | while (buffer_len(&stderr_buffer) > 0 && | |
175 | packet_not_very_much_data_to_write()) { | |
176 | len = buffer_len(&stderr_buffer); | |
177 | if (packet_is_interactive()) { | |
178 | if (len > 512) | |
179 | len = 512; | |
180 | } else { | |
181 | /* Keep the packets at reasonable size. */ | |
182 | if (len > packet_get_maxsize()) | |
183 | len = packet_get_maxsize(); | |
184 | } | |
185 | packet_start(SSH_SMSG_STDERR_DATA); | |
186 | packet_put_string(buffer_ptr(&stderr_buffer), len); | |
187 | packet_send(); | |
188 | buffer_consume(&stderr_buffer, len); | |
189 | stderr_bytes += len; | |
190 | } | |
191 | } | |
192 | ||
193 | /* | |
194 | * Make packets from buffered stdout data, and buffer it for sending to the | |
195 | * client. | |
196 | */ | |
197 | static void | |
198 | make_packets_from_stdout_data(void) | |
199 | { | |
473db5ab | 200 | u_int len; |
3c0ef626 | 201 | |
202 | /* Send buffered stdout data to the client. */ | |
203 | while (buffer_len(&stdout_buffer) > 0 && | |
204 | packet_not_very_much_data_to_write()) { | |
205 | len = buffer_len(&stdout_buffer); | |
206 | if (packet_is_interactive()) { | |
207 | if (len > 512) | |
208 | len = 512; | |
209 | } else { | |
210 | /* Keep the packets at reasonable size. */ | |
211 | if (len > packet_get_maxsize()) | |
212 | len = packet_get_maxsize(); | |
213 | } | |
214 | packet_start(SSH_SMSG_STDOUT_DATA); | |
215 | packet_put_string(buffer_ptr(&stdout_buffer), len); | |
216 | packet_send(); | |
217 | buffer_consume(&stdout_buffer, len); | |
218 | stdout_bytes += len; | |
219 | } | |
220 | } | |
221 | ||
222 | static void | |
223 | client_alive_check(void) | |
224 | { | |
473db5ab | 225 | int channel_id; |
3c0ef626 | 226 | |
227 | /* timeout, check to see how many we have had */ | |
228 | if (++client_alive_timeouts > options.client_alive_count_max) | |
229 | packet_disconnect("Timeout, your session not responding."); | |
230 | ||
3c0ef626 | 231 | /* |
473db5ab | 232 | * send a bogus global/channel request with "wantreply", |
3c0ef626 | 233 | * we should get back a failure |
234 | */ | |
473db5ab | 235 | if ((channel_id = channel_find_open()) == -1) { |
236 | packet_start(SSH2_MSG_GLOBAL_REQUEST); | |
237 | packet_put_cstring("keepalive@openssh.com"); | |
238 | packet_put_char(1); /* boolean: want reply */ | |
239 | } else { | |
240 | channel_request_start(channel_id, "keepalive@openssh.com", 1); | |
241 | } | |
3c0ef626 | 242 | packet_send(); |
243 | } | |
244 | ||
245 | /* | |
246 | * Sleep in select() until we can do something. This will initialize the | |
247 | * select masks. Upon return, the masks will indicate which descriptors | |
248 | * have data or can accept data. Optionally, a maximum time can be specified | |
249 | * for the duration of the wait (0 = infinite). | |
250 | */ | |
251 | static void | |
252 | wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp, int *maxfdp, | |
473db5ab | 253 | u_int *nallocp, u_int max_time_milliseconds) |
3c0ef626 | 254 | { |
255 | struct timeval tv, *tvp; | |
256 | int ret; | |
257 | int client_alive_scheduled = 0; | |
258 | ||
259 | /* | |
473db5ab | 260 | * if using client_alive, set the max timeout accordingly, |
3c0ef626 | 261 | * and indicate that this particular timeout was for client |
262 | * alive by setting the client_alive_scheduled flag. | |
263 | * | |
264 | * this could be randomized somewhat to make traffic | |
473db5ab | 265 | * analysis more difficult, but we're not doing it yet. |
3c0ef626 | 266 | */ |
267 | if (compat20 && | |
268 | max_time_milliseconds == 0 && options.client_alive_interval) { | |
269 | client_alive_scheduled = 1; | |
270 | max_time_milliseconds = options.client_alive_interval * 1000; | |
271 | } | |
272 | ||
273 | /* Allocate and update select() masks for channel descriptors. */ | |
274 | channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, 0); | |
275 | ||
276 | if (compat20) { | |
277 | #if 0 | |
278 | /* wrong: bad condition XXX */ | |
279 | if (channel_not_very_much_buffered_data()) | |
280 | #endif | |
281 | FD_SET(connection_in, *readsetp); | |
282 | } else { | |
283 | /* | |
284 | * Read packets from the client unless we have too much | |
285 | * buffered stdin or channel data. | |
286 | */ | |
287 | if (buffer_len(&stdin_buffer) < buffer_high && | |
288 | channel_not_very_much_buffered_data()) | |
289 | FD_SET(connection_in, *readsetp); | |
290 | /* | |
291 | * If there is not too much data already buffered going to | |
292 | * the client, try to get some more data from the program. | |
293 | */ | |
294 | if (packet_not_very_much_data_to_write()) { | |
295 | if (!fdout_eof) | |
296 | FD_SET(fdout, *readsetp); | |
297 | if (!fderr_eof) | |
298 | FD_SET(fderr, *readsetp); | |
299 | } | |
300 | /* | |
301 | * If we have buffered data, try to write some of that data | |
302 | * to the program. | |
303 | */ | |
304 | if (fdin != -1 && buffer_len(&stdin_buffer) > 0) | |
305 | FD_SET(fdin, *writesetp); | |
306 | } | |
473db5ab | 307 | notify_prepare(*readsetp); |
3c0ef626 | 308 | |
309 | /* | |
310 | * If we have buffered packet data going to the client, mark that | |
311 | * descriptor. | |
312 | */ | |
313 | if (packet_have_data_to_write()) | |
314 | FD_SET(connection_out, *writesetp); | |
315 | ||
316 | /* | |
317 | * If child has terminated and there is enough buffer space to read | |
318 | * from it, then read as much as is available and exit. | |
319 | */ | |
320 | if (child_terminated && packet_not_very_much_data_to_write()) | |
321 | if (max_time_milliseconds == 0 || client_alive_scheduled) | |
322 | max_time_milliseconds = 100; | |
323 | ||
324 | if (max_time_milliseconds == 0) | |
325 | tvp = NULL; | |
326 | else { | |
327 | tv.tv_sec = max_time_milliseconds / 1000; | |
328 | tv.tv_usec = 1000 * (max_time_milliseconds % 1000); | |
329 | tvp = &tv; | |
330 | } | |
3c0ef626 | 331 | |
332 | /* Wait for something to happen, or the timeout to expire. */ | |
333 | ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp); | |
334 | ||
335 | if (ret == -1) { | |
336 | memset(*readsetp, 0, *nallocp); | |
337 | memset(*writesetp, 0, *nallocp); | |
338 | if (errno != EINTR) | |
339 | error("select: %.100s", strerror(errno)); | |
340 | } else if (ret == 0 && client_alive_scheduled) | |
341 | client_alive_check(); | |
473db5ab | 342 | |
343 | notify_done(*readsetp); | |
3c0ef626 | 344 | } |
345 | ||
346 | /* | |
347 | * Processes input from the client and the program. Input data is stored | |
348 | * in buffers and processed later. | |
349 | */ | |
350 | static void | |
351 | process_input(fd_set * readset) | |
352 | { | |
353 | int len; | |
354 | char buf[16384]; | |
355 | ||
356 | /* Read and buffer any input data from the client. */ | |
357 | if (FD_ISSET(connection_in, readset)) { | |
358 | len = read(connection_in, buf, sizeof(buf)); | |
359 | if (len == 0) { | |
473db5ab | 360 | verbose("Connection closed by %.100s", |
361 | get_remote_ipaddr()); | |
3c0ef626 | 362 | connection_closed = 1; |
363 | if (compat20) | |
364 | return; | |
473db5ab | 365 | cleanup_exit(255); |
3c0ef626 | 366 | } else if (len < 0) { |
367 | if (errno != EINTR && errno != EAGAIN) { | |
473db5ab | 368 | verbose("Read error from remote host " |
369 | "%.100s: %.100s", | |
370 | get_remote_ipaddr(), strerror(errno)); | |
371 | cleanup_exit(255); | |
3c0ef626 | 372 | } |
373 | } else { | |
374 | /* Buffer any received data. */ | |
375 | packet_process_incoming(buf, len); | |
376 | } | |
377 | } | |
378 | if (compat20) | |
379 | return; | |
380 | ||
381 | /* Read and buffer any available stdout data from the program. */ | |
382 | if (!fdout_eof && FD_ISSET(fdout, readset)) { | |
383 | len = read(fdout, buf, sizeof(buf)); | |
384 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) { | |
385 | /* do nothing */ | |
386 | } else if (len <= 0) { | |
387 | fdout_eof = 1; | |
388 | } else { | |
389 | buffer_append(&stdout_buffer, buf, len); | |
390 | fdout_bytes += len; | |
391 | } | |
392 | } | |
393 | /* Read and buffer any available stderr data from the program. */ | |
394 | if (!fderr_eof && FD_ISSET(fderr, readset)) { | |
395 | len = read(fderr, buf, sizeof(buf)); | |
396 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) { | |
397 | /* do nothing */ | |
398 | } else if (len <= 0) { | |
399 | fderr_eof = 1; | |
400 | } else { | |
401 | buffer_append(&stderr_buffer, buf, len); | |
402 | } | |
403 | } | |
404 | } | |
405 | ||
406 | /* | |
407 | * Sends data from internal buffers to client program stdin. | |
408 | */ | |
409 | static void | |
410 | process_output(fd_set * writeset) | |
411 | { | |
412 | struct termios tio; | |
413 | u_char *data; | |
414 | u_int dlen; | |
415 | int len; | |
416 | ||
417 | /* Write buffered data to program stdin. */ | |
418 | if (!compat20 && fdin != -1 && FD_ISSET(fdin, writeset)) { | |
419 | data = buffer_ptr(&stdin_buffer); | |
420 | dlen = buffer_len(&stdin_buffer); | |
421 | len = write(fdin, data, dlen); | |
422 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) { | |
423 | /* do nothing */ | |
424 | } else if (len <= 0) { | |
3c0ef626 | 425 | if (fdin != fdout) |
426 | close(fdin); | |
427 | else | |
428 | shutdown(fdin, SHUT_WR); /* We will no longer send. */ | |
3c0ef626 | 429 | fdin = -1; |
430 | } else { | |
431 | /* Successful write. */ | |
432 | if (fdin_is_tty && dlen >= 1 && data[0] != '\r' && | |
433 | tcgetattr(fdin, &tio) == 0 && | |
434 | !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) { | |
435 | /* | |
436 | * Simulate echo to reduce the impact of | |
437 | * traffic analysis | |
438 | */ | |
439 | packet_send_ignore(len); | |
440 | packet_send(); | |
441 | } | |
442 | /* Consume the data from the buffer. */ | |
443 | buffer_consume(&stdin_buffer, len); | |
444 | /* Update the count of bytes written to the program. */ | |
445 | stdin_bytes += len; | |
446 | } | |
447 | } | |
448 | /* Send any buffered packet data to the client. */ | |
449 | if (FD_ISSET(connection_out, writeset)) | |
450 | packet_write_poll(); | |
451 | } | |
452 | ||
453 | /* | |
454 | * Wait until all buffered output has been sent to the client. | |
455 | * This is used when the program terminates. | |
456 | */ | |
457 | static void | |
458 | drain_output(void) | |
459 | { | |
460 | /* Send any buffered stdout data to the client. */ | |
461 | if (buffer_len(&stdout_buffer) > 0) { | |
462 | packet_start(SSH_SMSG_STDOUT_DATA); | |
463 | packet_put_string(buffer_ptr(&stdout_buffer), | |
464 | buffer_len(&stdout_buffer)); | |
465 | packet_send(); | |
466 | /* Update the count of sent bytes. */ | |
467 | stdout_bytes += buffer_len(&stdout_buffer); | |
468 | } | |
469 | /* Send any buffered stderr data to the client. */ | |
470 | if (buffer_len(&stderr_buffer) > 0) { | |
471 | packet_start(SSH_SMSG_STDERR_DATA); | |
472 | packet_put_string(buffer_ptr(&stderr_buffer), | |
473 | buffer_len(&stderr_buffer)); | |
474 | packet_send(); | |
475 | /* Update the count of sent bytes. */ | |
476 | stderr_bytes += buffer_len(&stderr_buffer); | |
477 | } | |
478 | /* Wait until all buffered data has been written to the client. */ | |
479 | packet_write_wait(); | |
480 | } | |
481 | ||
482 | static void | |
483 | process_buffered_input_packets(void) | |
484 | { | |
485 | dispatch_run(DISPATCH_NONBLOCK, NULL, compat20 ? xxx_kex : NULL); | |
486 | } | |
487 | ||
488 | /* | |
489 | * Performs the interactive session. This handles data transmission between | |
490 | * the client and the program. Note that the notion of stdin, stdout, and | |
491 | * stderr in this function is sort of reversed: this function writes to | |
492 | * stdin (of the child program), and reads from stdout and stderr (of the | |
493 | * child program). | |
494 | */ | |
495 | void | |
496 | server_loop(pid_t pid, int fdin_arg, int fdout_arg, int fderr_arg) | |
497 | { | |
498 | fd_set *readset = NULL, *writeset = NULL; | |
473db5ab | 499 | int max_fd = 0; |
500 | u_int nalloc = 0; | |
3c0ef626 | 501 | int wait_status; /* Status returned by wait(). */ |
502 | pid_t wait_pid; /* pid returned by wait(). */ | |
503 | int waiting_termination = 0; /* Have displayed waiting close message. */ | |
504 | u_int max_time_milliseconds; | |
505 | u_int previous_stdout_buffer_bytes; | |
506 | u_int stdout_buffer_bytes; | |
507 | int type; | |
508 | ||
509 | debug("Entering interactive session."); | |
510 | ||
511 | /* Initialize the SIGCHLD kludge. */ | |
512 | child_terminated = 0; | |
513 | mysignal(SIGCHLD, sigchld_handler); | |
514 | ||
08822d99 | 515 | if (!use_privsep) { |
516 | signal(SIGTERM, sigterm_handler); | |
517 | signal(SIGINT, sigterm_handler); | |
518 | signal(SIGQUIT, sigterm_handler); | |
519 | } | |
520 | ||
3c0ef626 | 521 | /* Initialize our global variables. */ |
522 | fdin = fdin_arg; | |
523 | fdout = fdout_arg; | |
524 | fderr = fderr_arg; | |
525 | ||
526 | /* nonblocking IO */ | |
527 | set_nonblock(fdin); | |
528 | set_nonblock(fdout); | |
529 | /* we don't have stderr for interactive terminal sessions, see below */ | |
530 | if (fderr != -1) | |
531 | set_nonblock(fderr); | |
532 | ||
533 | if (!(datafellows & SSH_BUG_IGNOREMSG) && isatty(fdin)) | |
534 | fdin_is_tty = 1; | |
535 | ||
536 | connection_in = packet_get_connection_in(); | |
537 | connection_out = packet_get_connection_out(); | |
538 | ||
473db5ab | 539 | notify_setup(); |
540 | ||
3c0ef626 | 541 | previous_stdout_buffer_bytes = 0; |
542 | ||
543 | /* Set approximate I/O buffer size. */ | |
544 | if (packet_is_interactive()) | |
545 | buffer_high = 4096; | |
546 | else | |
547 | buffer_high = 64 * 1024; | |
548 | ||
549 | #if 0 | |
550 | /* Initialize max_fd to the maximum of the known file descriptors. */ | |
551 | max_fd = MAX(connection_in, connection_out); | |
552 | max_fd = MAX(max_fd, fdin); | |
553 | max_fd = MAX(max_fd, fdout); | |
554 | if (fderr != -1) | |
555 | max_fd = MAX(max_fd, fderr); | |
556 | #endif | |
557 | ||
558 | /* Initialize Initialize buffers. */ | |
559 | buffer_init(&stdin_buffer); | |
560 | buffer_init(&stdout_buffer); | |
561 | buffer_init(&stderr_buffer); | |
562 | ||
563 | /* | |
564 | * If we have no separate fderr (which is the case when we have a pty | |
565 | * - there we cannot make difference between data sent to stdout and | |
566 | * stderr), indicate that we have seen an EOF from stderr. This way | |
08822d99 | 567 | * we don't need to check the descriptor everywhere. |
3c0ef626 | 568 | */ |
569 | if (fderr == -1) | |
570 | fderr_eof = 1; | |
571 | ||
572 | server_init_dispatch(); | |
573 | ||
574 | /* Main loop of the server for the interactive session mode. */ | |
575 | for (;;) { | |
576 | ||
577 | /* Process buffered packets from the client. */ | |
578 | process_buffered_input_packets(); | |
579 | ||
580 | /* | |
581 | * If we have received eof, and there is no more pending | |
582 | * input data, cause a real eof by closing fdin. | |
583 | */ | |
584 | if (stdin_eof && fdin != -1 && buffer_len(&stdin_buffer) == 0) { | |
3c0ef626 | 585 | if (fdin != fdout) |
586 | close(fdin); | |
587 | else | |
588 | shutdown(fdin, SHUT_WR); /* We will no longer send. */ | |
3c0ef626 | 589 | fdin = -1; |
590 | } | |
591 | /* Make packets from buffered stderr data to send to the client. */ | |
592 | make_packets_from_stderr_data(); | |
593 | ||
594 | /* | |
595 | * Make packets from buffered stdout data to send to the | |
596 | * client. If there is very little to send, this arranges to | |
597 | * not send them now, but to wait a short while to see if we | |
598 | * are getting more data. This is necessary, as some systems | |
599 | * wake up readers from a pty after each separate character. | |
600 | */ | |
601 | max_time_milliseconds = 0; | |
602 | stdout_buffer_bytes = buffer_len(&stdout_buffer); | |
603 | if (stdout_buffer_bytes != 0 && stdout_buffer_bytes < 256 && | |
604 | stdout_buffer_bytes != previous_stdout_buffer_bytes) { | |
605 | /* try again after a while */ | |
606 | max_time_milliseconds = 10; | |
607 | } else { | |
608 | /* Send it now. */ | |
609 | make_packets_from_stdout_data(); | |
610 | } | |
611 | previous_stdout_buffer_bytes = buffer_len(&stdout_buffer); | |
612 | ||
613 | /* Send channel data to the client. */ | |
614 | if (packet_not_very_much_data_to_write()) | |
615 | channel_output_poll(); | |
616 | ||
617 | /* | |
618 | * Bail out of the loop if the program has closed its output | |
619 | * descriptors, and we have no more data to send to the | |
620 | * client, and there is no pending buffered data. | |
621 | */ | |
622 | if (fdout_eof && fderr_eof && !packet_have_data_to_write() && | |
623 | buffer_len(&stdout_buffer) == 0 && buffer_len(&stderr_buffer) == 0) { | |
624 | if (!channel_still_open()) | |
625 | break; | |
626 | if (!waiting_termination) { | |
627 | const char *s = "Waiting for forwarded connections to terminate...\r\n"; | |
628 | char *cp; | |
629 | waiting_termination = 1; | |
630 | buffer_append(&stderr_buffer, s, strlen(s)); | |
631 | ||
632 | /* Display list of open channels. */ | |
633 | cp = channel_open_message(); | |
634 | buffer_append(&stderr_buffer, cp, strlen(cp)); | |
635 | xfree(cp); | |
636 | } | |
637 | } | |
638 | max_fd = MAX(connection_in, connection_out); | |
639 | max_fd = MAX(max_fd, fdin); | |
640 | max_fd = MAX(max_fd, fdout); | |
641 | max_fd = MAX(max_fd, fderr); | |
473db5ab | 642 | max_fd = MAX(max_fd, notify_pipe[0]); |
3c0ef626 | 643 | |
644 | /* Sleep in select() until we can do something. */ | |
645 | wait_until_can_do_something(&readset, &writeset, &max_fd, | |
646 | &nalloc, max_time_milliseconds); | |
647 | ||
08822d99 | 648 | if (received_sigterm) { |
649 | logit("Exiting on signal %d", received_sigterm); | |
650 | /* Clean up sessions, utmp, etc. */ | |
651 | cleanup_exit(255); | |
652 | } | |
653 | ||
3c0ef626 | 654 | /* Process any channel events. */ |
655 | channel_after_select(readset, writeset); | |
656 | ||
657 | /* Process input from the client and from program stdout/stderr. */ | |
658 | process_input(readset); | |
659 | ||
660 | /* Process output to the client and to program stdin. */ | |
661 | process_output(writeset); | |
662 | } | |
663 | if (readset) | |
664 | xfree(readset); | |
665 | if (writeset) | |
666 | xfree(writeset); | |
667 | ||
668 | /* Cleanup and termination code. */ | |
669 | ||
670 | /* Wait until all output has been sent to the client. */ | |
671 | drain_output(); | |
672 | ||
673 | debug("End of interactive session; stdin %ld, stdout (read %ld, sent %ld), stderr %ld bytes.", | |
473db5ab | 674 | stdin_bytes, fdout_bytes, stdout_bytes, stderr_bytes); |
3c0ef626 | 675 | |
676 | /* Free and clear the buffers. */ | |
677 | buffer_free(&stdin_buffer); | |
678 | buffer_free(&stdout_buffer); | |
679 | buffer_free(&stderr_buffer); | |
680 | ||
681 | /* Close the file descriptors. */ | |
682 | if (fdout != -1) | |
683 | close(fdout); | |
684 | fdout = -1; | |
685 | fdout_eof = 1; | |
686 | if (fderr != -1) | |
687 | close(fderr); | |
688 | fderr = -1; | |
689 | fderr_eof = 1; | |
690 | if (fdin != -1) | |
691 | close(fdin); | |
692 | fdin = -1; | |
693 | ||
694 | channel_free_all(); | |
695 | ||
696 | /* We no longer want our SIGCHLD handler to be called. */ | |
697 | mysignal(SIGCHLD, SIG_DFL); | |
698 | ||
473db5ab | 699 | while ((wait_pid = waitpid(-1, &wait_status, 0)) < 0) |
700 | if (errno != EINTR) | |
701 | packet_disconnect("wait: %.100s", strerror(errno)); | |
702 | if (wait_pid != pid) | |
703 | error("Strange, wait returned pid %ld, expected %ld", | |
704 | (long)wait_pid, (long)pid); | |
3c0ef626 | 705 | |
706 | /* Check if it exited normally. */ | |
707 | if (WIFEXITED(wait_status)) { | |
708 | /* Yes, normal exit. Get exit status and send it to the client. */ | |
709 | debug("Command exited with status %d.", WEXITSTATUS(wait_status)); | |
710 | packet_start(SSH_SMSG_EXITSTATUS); | |
711 | packet_put_int(WEXITSTATUS(wait_status)); | |
712 | packet_send(); | |
713 | packet_write_wait(); | |
714 | ||
715 | /* | |
716 | * Wait for exit confirmation. Note that there might be | |
717 | * other packets coming before it; however, the program has | |
718 | * already died so we just ignore them. The client is | |
719 | * supposed to respond with the confirmation when it receives | |
720 | * the exit status. | |
721 | */ | |
722 | do { | |
473db5ab | 723 | type = packet_read(); |
3c0ef626 | 724 | } |
725 | while (type != SSH_CMSG_EXIT_CONFIRMATION); | |
726 | ||
727 | debug("Received exit confirmation."); | |
728 | return; | |
729 | } | |
730 | /* Check if the program terminated due to a signal. */ | |
731 | if (WIFSIGNALED(wait_status)) | |
732 | packet_disconnect("Command terminated on signal %d.", | |
733 | WTERMSIG(wait_status)); | |
734 | ||
735 | /* Some weird exit cause. Just exit. */ | |
736 | packet_disconnect("wait returned status %04x.", wait_status); | |
737 | /* NOTREACHED */ | |
738 | } | |
739 | ||
740 | static void | |
741 | collect_children(void) | |
742 | { | |
743 | pid_t pid; | |
744 | sigset_t oset, nset; | |
745 | int status; | |
746 | ||
747 | /* block SIGCHLD while we check for dead children */ | |
748 | sigemptyset(&nset); | |
749 | sigaddset(&nset, SIGCHLD); | |
750 | sigprocmask(SIG_BLOCK, &nset, &oset); | |
751 | if (child_terminated) { | |
473db5ab | 752 | while ((pid = waitpid(-1, &status, WNOHANG)) > 0 || |
753 | (pid < 0 && errno == EINTR)) | |
754 | if (pid > 0) | |
755 | session_close_by_pid(pid, status); | |
3c0ef626 | 756 | child_terminated = 0; |
757 | } | |
758 | sigprocmask(SIG_SETMASK, &oset, NULL); | |
759 | } | |
760 | ||
761 | void | |
762 | server_loop2(Authctxt *authctxt) | |
763 | { | |
764 | fd_set *readset = NULL, *writeset = NULL; | |
765 | int rekeying = 0, max_fd, nalloc = 0; | |
766 | ||
767 | debug("Entering interactive session for SSH2."); | |
768 | ||
769 | mysignal(SIGCHLD, sigchld_handler); | |
770 | child_terminated = 0; | |
771 | connection_in = packet_get_connection_in(); | |
772 | connection_out = packet_get_connection_out(); | |
773 | ||
08822d99 | 774 | if (!use_privsep) { |
775 | signal(SIGTERM, sigterm_handler); | |
776 | signal(SIGINT, sigterm_handler); | |
777 | signal(SIGQUIT, sigterm_handler); | |
778 | } | |
779 | ||
473db5ab | 780 | notify_setup(); |
781 | ||
3c0ef626 | 782 | max_fd = MAX(connection_in, connection_out); |
473db5ab | 783 | max_fd = MAX(max_fd, notify_pipe[0]); |
3c0ef626 | 784 | |
785 | server_init_dispatch(); | |
786 | ||
787 | for (;;) { | |
788 | process_buffered_input_packets(); | |
789 | ||
790 | rekeying = (xxx_kex != NULL && !xxx_kex->done); | |
791 | ||
792 | if (!rekeying && packet_not_very_much_data_to_write()) | |
793 | channel_output_poll(); | |
794 | wait_until_can_do_something(&readset, &writeset, &max_fd, | |
795 | &nalloc, 0); | |
796 | ||
08822d99 | 797 | if (received_sigterm) { |
798 | logit("Exiting on signal %d", received_sigterm); | |
799 | /* Clean up sessions, utmp, etc. */ | |
800 | cleanup_exit(255); | |
801 | } | |
802 | ||
3c0ef626 | 803 | collect_children(); |
473db5ab | 804 | if (!rekeying) { |
3c0ef626 | 805 | channel_after_select(readset, writeset); |
473db5ab | 806 | if (packet_need_rekeying()) { |
807 | debug("need rekeying"); | |
808 | xxx_kex->done = 0; | |
809 | kex_send_kexinit(xxx_kex); | |
810 | } | |
811 | } | |
3c0ef626 | 812 | process_input(readset); |
813 | if (connection_closed) | |
814 | break; | |
815 | process_output(writeset); | |
816 | } | |
817 | collect_children(); | |
818 | ||
819 | if (readset) | |
820 | xfree(readset); | |
821 | if (writeset) | |
822 | xfree(writeset); | |
823 | ||
824 | /* free all channels, no more reads and writes */ | |
825 | channel_free_all(); | |
826 | ||
827 | /* free remaining sessions, e.g. remove wtmp entries */ | |
473db5ab | 828 | session_destroy_all(NULL); |
3c0ef626 | 829 | } |
830 | ||
831 | static void | |
473db5ab | 832 | server_input_keep_alive(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 833 | { |
473db5ab | 834 | debug("Got %d/%u for keepalive", type, seq); |
835 | /* | |
3c0ef626 | 836 | * reset timeout, since we got a sane answer from the client. |
837 | * even if this was generated by something other than | |
838 | * the bogus CHANNEL_REQUEST we send for keepalives. | |
839 | */ | |
473db5ab | 840 | client_alive_timeouts = 0; |
3c0ef626 | 841 | } |
842 | ||
3c0ef626 | 843 | static void |
473db5ab | 844 | server_input_stdin_data(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 845 | { |
846 | char *data; | |
847 | u_int data_len; | |
848 | ||
849 | /* Stdin data from the client. Append it to the buffer. */ | |
850 | /* Ignore any data if the client has closed stdin. */ | |
851 | if (fdin == -1) | |
852 | return; | |
853 | data = packet_get_string(&data_len); | |
473db5ab | 854 | packet_check_eom(); |
3c0ef626 | 855 | buffer_append(&stdin_buffer, data, data_len); |
856 | memset(data, 0, data_len); | |
857 | xfree(data); | |
858 | } | |
859 | ||
860 | static void | |
473db5ab | 861 | server_input_eof(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 862 | { |
863 | /* | |
864 | * Eof from the client. The stdin descriptor to the | |
865 | * program will be closed when all buffered data has | |
866 | * drained. | |
867 | */ | |
868 | debug("EOF received for stdin."); | |
473db5ab | 869 | packet_check_eom(); |
3c0ef626 | 870 | stdin_eof = 1; |
871 | } | |
872 | ||
873 | static void | |
473db5ab | 874 | server_input_window_size(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 875 | { |
876 | int row = packet_get_int(); | |
877 | int col = packet_get_int(); | |
878 | int xpixel = packet_get_int(); | |
879 | int ypixel = packet_get_int(); | |
880 | ||
881 | debug("Window change received."); | |
473db5ab | 882 | packet_check_eom(); |
3c0ef626 | 883 | if (fdin != -1) |
884 | pty_change_window_size(fdin, row, col, xpixel, ypixel); | |
885 | } | |
886 | ||
887 | static Channel * | |
473db5ab | 888 | server_request_direct_tcpip(void) |
3c0ef626 | 889 | { |
890 | Channel *c; | |
891 | int sock; | |
892 | char *target, *originator; | |
893 | int target_port, originator_port; | |
894 | ||
895 | target = packet_get_string(NULL); | |
896 | target_port = packet_get_int(); | |
897 | originator = packet_get_string(NULL); | |
898 | originator_port = packet_get_int(); | |
473db5ab | 899 | packet_check_eom(); |
3c0ef626 | 900 | |
901 | debug("server_request_direct_tcpip: originator %s port %d, target %s port %d", | |
473db5ab | 902 | originator, originator_port, target, target_port); |
3c0ef626 | 903 | |
904 | /* XXX check permission */ | |
905 | sock = channel_connect_to(target, target_port); | |
906 | xfree(target); | |
907 | xfree(originator); | |
908 | if (sock < 0) | |
909 | return NULL; | |
a7213e65 | 910 | if (options.hpn_disabled) |
911 | c = channel_new("direct-tcpip", SSH_CHANNEL_CONNECTING, | |
912 | sock, sock, -1, CHAN_TCP_WINDOW_DEFAULT, | |
913 | CHAN_TCP_PACKET_DEFAULT, 0, "direct-tcpip", 1); | |
914 | else | |
915 | c = channel_new("direct-tcpip", SSH_CHANNEL_CONNECTING, | |
916 | sock, sock, -1, options.hpn_buffer_size, | |
917 | CHAN_TCP_PACKET_DEFAULT, 0, "direct-tcpip", 1); | |
3c0ef626 | 918 | return c; |
919 | } | |
920 | ||
08822d99 | 921 | static Channel * |
922 | server_request_tun(void) | |
923 | { | |
924 | Channel *c = NULL; | |
925 | int mode, tun; | |
926 | int sock; | |
927 | ||
928 | mode = packet_get_int(); | |
929 | switch (mode) { | |
930 | case SSH_TUNMODE_POINTOPOINT: | |
931 | case SSH_TUNMODE_ETHERNET: | |
932 | break; | |
933 | default: | |
934 | packet_send_debug("Unsupported tunnel device mode."); | |
935 | return NULL; | |
936 | } | |
937 | if ((options.permit_tun & mode) == 0) { | |
938 | packet_send_debug("Server has rejected tunnel device " | |
939 | "forwarding"); | |
940 | return NULL; | |
941 | } | |
942 | ||
943 | tun = packet_get_int(); | |
944 | if (forced_tun_device != -1) { | |
945 | if (tun != SSH_TUNID_ANY && forced_tun_device != tun) | |
946 | goto done; | |
947 | tun = forced_tun_device; | |
948 | } | |
949 | sock = tun_open(tun, mode); | |
950 | if (sock < 0) | |
951 | goto done; | |
a7213e65 | 952 | if (options.hpn_disabled) |
953 | c = channel_new("tun", SSH_CHANNEL_OPEN, sock, sock, -1, | |
954 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1); | |
955 | else | |
956 | c = channel_new("tun", SSH_CHANNEL_OPEN, sock, sock, -1, | |
957 | options.hpn_buffer_size, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1); | |
08822d99 | 958 | c->datagram = 1; |
959 | #if defined(SSH_TUN_FILTER) | |
960 | if (mode == SSH_TUNMODE_POINTOPOINT) | |
961 | channel_register_filter(c->self, sys_tun_infilter, | |
962 | sys_tun_outfilter); | |
963 | #endif | |
964 | ||
965 | done: | |
966 | if (c == NULL) | |
967 | packet_send_debug("Failed to open the tunnel device."); | |
968 | return c; | |
969 | } | |
970 | ||
3c0ef626 | 971 | static Channel * |
473db5ab | 972 | server_request_session(void) |
3c0ef626 | 973 | { |
974 | Channel *c; | |
975 | ||
976 | debug("input_session_request"); | |
473db5ab | 977 | packet_check_eom(); |
3c0ef626 | 978 | /* |
979 | * A server session has no fd to read or write until a | |
980 | * CHANNEL_REQUEST for a shell is made, so we set the type to | |
981 | * SSH_CHANNEL_LARVAL. Additionally, a callback for handling all | |
982 | * CHANNEL_REQUEST messages is registered. | |
983 | */ | |
473db5ab | 984 | c = channel_new("session", SSH_CHANNEL_LARVAL, |
3c0ef626 | 985 | -1, -1, -1, /*window size*/0, CHAN_SES_PACKET_DEFAULT, |
473db5ab | 986 | 0, "server-session", 1); |
a7213e65 | 987 | if ((options.tcp_rcv_buf_poll > 0) && (!options.hpn_disabled)) |
473db5ab | 988 | c->dynamic_window = 1; |
989 | if (session_open(the_authctxt, c->self) != 1) { | |
3c0ef626 | 990 | debug("session open failed, free channel %d", c->self); |
991 | channel_free(c); | |
992 | return NULL; | |
993 | } | |
08822d99 | 994 | channel_register_cleanup(c->self, session_close_by_channel, 0); |
3c0ef626 | 995 | return c; |
996 | } | |
997 | ||
998 | static void | |
473db5ab | 999 | server_input_channel_open(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 1000 | { |
1001 | Channel *c = NULL; | |
1002 | char *ctype; | |
3c0ef626 | 1003 | int rchan; |
473db5ab | 1004 | u_int rmaxpack, rwindow, len; |
3c0ef626 | 1005 | |
1006 | ctype = packet_get_string(&len); | |
1007 | rchan = packet_get_int(); | |
1008 | rwindow = packet_get_int(); | |
1009 | rmaxpack = packet_get_int(); | |
1010 | ||
1011 | debug("server_input_channel_open: ctype %s rchan %d win %d max %d", | |
1012 | ctype, rchan, rwindow, rmaxpack); | |
1013 | ||
1014 | if (strcmp(ctype, "session") == 0) { | |
473db5ab | 1015 | c = server_request_session(); |
3c0ef626 | 1016 | } else if (strcmp(ctype, "direct-tcpip") == 0) { |
473db5ab | 1017 | c = server_request_direct_tcpip(); |
08822d99 | 1018 | } else if (strcmp(ctype, "tun@openssh.com") == 0) { |
1019 | c = server_request_tun(); | |
3c0ef626 | 1020 | } |
1021 | if (c != NULL) { | |
1022 | debug("server_input_channel_open: confirm %s", ctype); | |
1023 | c->remote_id = rchan; | |
1024 | c->remote_window = rwindow; | |
1025 | c->remote_maxpacket = rmaxpack; | |
1026 | if (c->type != SSH_CHANNEL_CONNECTING) { | |
1027 | packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1028 | packet_put_int(c->remote_id); | |
1029 | packet_put_int(c->self); | |
1030 | packet_put_int(c->local_window); | |
1031 | packet_put_int(c->local_maxpacket); | |
1032 | packet_send(); | |
1033 | } | |
1034 | } else { | |
1035 | debug("server_input_channel_open: failure %s", ctype); | |
1036 | packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); | |
1037 | packet_put_int(rchan); | |
1038 | packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED); | |
1039 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { | |
1040 | packet_put_cstring("open failed"); | |
1041 | packet_put_cstring(""); | |
1042 | } | |
1043 | packet_send(); | |
1044 | } | |
1045 | xfree(ctype); | |
1046 | } | |
1047 | ||
1048 | static void | |
473db5ab | 1049 | server_input_global_request(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 1050 | { |
1051 | char *rtype; | |
1052 | int want_reply; | |
1053 | int success = 0; | |
1054 | ||
1055 | rtype = packet_get_string(NULL); | |
1056 | want_reply = packet_get_char(); | |
1057 | debug("server_input_global_request: rtype %s want_reply %d", rtype, want_reply); | |
1058 | ||
1059 | /* -R style forwarding */ | |
1060 | if (strcmp(rtype, "tcpip-forward") == 0) { | |
1061 | struct passwd *pw; | |
1062 | char *listen_address; | |
1063 | u_short listen_port; | |
1064 | ||
473db5ab | 1065 | pw = the_authctxt->pw; |
1066 | if (pw == NULL || !the_authctxt->valid) | |
1067 | fatal("server_input_global_request: no/invalid user"); | |
1068 | listen_address = packet_get_string(NULL); | |
3c0ef626 | 1069 | listen_port = (u_short)packet_get_int(); |
1070 | debug("server_input_global_request: tcpip-forward listen %s port %d", | |
1071 | listen_address, listen_port); | |
1072 | ||
1073 | /* check permissions */ | |
1074 | if (!options.allow_tcp_forwarding || | |
473db5ab | 1075 | no_port_forwarding_flag |
1076 | #ifndef NO_IPPORT_RESERVED_CONCEPT | |
1077 | || (listen_port < IPPORT_RESERVED && pw->pw_uid != 0) | |
1078 | #endif | |
1079 | ) { | |
3c0ef626 | 1080 | success = 0; |
1081 | packet_send_debug("Server has disabled port forwarding."); | |
1082 | } else { | |
1083 | /* Start listening on the port */ | |
473db5ab | 1084 | success = channel_setup_remote_fwd_listener( |
a7213e65 | 1085 | listen_address, listen_port, options.gateway_ports, |
1086 | options.hpn_disabled, options.hpn_buffer_size); | |
3c0ef626 | 1087 | } |
1088 | xfree(listen_address); | |
473db5ab | 1089 | } else if (strcmp(rtype, "cancel-tcpip-forward") == 0) { |
1090 | char *cancel_address; | |
1091 | u_short cancel_port; | |
1092 | ||
1093 | cancel_address = packet_get_string(NULL); | |
1094 | cancel_port = (u_short)packet_get_int(); | |
1095 | debug("%s: cancel-tcpip-forward addr %s port %d", __func__, | |
1096 | cancel_address, cancel_port); | |
1097 | ||
1098 | success = channel_cancel_rport_listener(cancel_address, | |
1099 | cancel_port); | |
3c0ef626 | 1100 | } |
1101 | if (want_reply) { | |
1102 | packet_start(success ? | |
1103 | SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE); | |
1104 | packet_send(); | |
1105 | packet_write_wait(); | |
1106 | } | |
1107 | xfree(rtype); | |
1108 | } | |
473db5ab | 1109 | static void |
1110 | server_input_channel_req(int type, u_int32_t seq, void *ctxt) | |
1111 | { | |
1112 | Channel *c; | |
1113 | int id, reply, success = 0; | |
1114 | char *rtype; | |
1115 | ||
1116 | id = packet_get_int(); | |
1117 | rtype = packet_get_string(NULL); | |
1118 | reply = packet_get_char(); | |
1119 | ||
1120 | debug("server_input_channel_req: channel %d request %s reply %d", | |
1121 | id, rtype, reply); | |
1122 | ||
1123 | if ((c = channel_lookup(id)) == NULL) | |
1124 | packet_disconnect("server_input_channel_req: " | |
1125 | "unknown channel %d", id); | |
1126 | if (c->type == SSH_CHANNEL_LARVAL || c->type == SSH_CHANNEL_OPEN) | |
1127 | success = session_input_channel_req(c, rtype); | |
1128 | if (reply) { | |
1129 | packet_start(success ? | |
1130 | SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE); | |
1131 | packet_put_int(c->remote_id); | |
1132 | packet_send(); | |
1133 | } | |
1134 | xfree(rtype); | |
1135 | } | |
3c0ef626 | 1136 | |
1137 | static void | |
1138 | server_init_dispatch_20(void) | |
1139 | { | |
1140 | debug("server_init_dispatch_20"); | |
1141 | dispatch_init(&dispatch_protocol_error); | |
1142 | dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose); | |
1143 | dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data); | |
1144 | dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof); | |
1145 | dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data); | |
1146 | dispatch_set(SSH2_MSG_CHANNEL_OPEN, &server_input_channel_open); | |
1147 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); | |
1148 | dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); | |
473db5ab | 1149 | dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &server_input_channel_req); |
3c0ef626 | 1150 | dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust); |
1151 | dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &server_input_global_request); | |
1152 | /* client_alive */ | |
473db5ab | 1153 | dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &server_input_keep_alive); |
1154 | dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &server_input_keep_alive); | |
1155 | dispatch_set(SSH2_MSG_REQUEST_FAILURE, &server_input_keep_alive); | |
3c0ef626 | 1156 | /* rekeying */ |
1157 | dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit); | |
1158 | } | |
1159 | static void | |
1160 | server_init_dispatch_13(void) | |
1161 | { | |
1162 | debug("server_init_dispatch_13"); | |
1163 | dispatch_init(NULL); | |
1164 | dispatch_set(SSH_CMSG_EOF, &server_input_eof); | |
1165 | dispatch_set(SSH_CMSG_STDIN_DATA, &server_input_stdin_data); | |
1166 | dispatch_set(SSH_CMSG_WINDOW_SIZE, &server_input_window_size); | |
1167 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close); | |
1168 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation); | |
1169 | dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data); | |
1170 | dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); | |
1171 | dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); | |
1172 | dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open); | |
1173 | } | |
1174 | static void | |
1175 | server_init_dispatch_15(void) | |
1176 | { | |
1177 | server_init_dispatch_13(); | |
1178 | debug("server_init_dispatch_15"); | |
1179 | dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof); | |
1180 | dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_oclose); | |
1181 | } | |
1182 | static void | |
1183 | server_init_dispatch(void) | |
1184 | { | |
1185 | if (compat20) | |
1186 | server_init_dispatch_20(); | |
1187 | else if (compat13) | |
1188 | server_init_dispatch_13(); | |
1189 | else | |
1190 | server_init_dispatch_15(); | |
1191 | } |