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8efc0c15 | 1 | /* |
5260325f | 2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
5260325f | 3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
4 | * All rights reserved | |
5260325f | 5 | * This file contains functions for generic socket connection forwarding. |
6 | * There is also code for initiating connection forwarding for X11 connections, | |
7 | * arbitrary tcp/ip connections, and the authentication agent connection. | |
6ae2364d | 8 | * |
bcbf86ec | 9 | * As far as I am concerned, the code I have written for this software |
10 | * can be used freely for any purpose. Any derived versions of this | |
11 | * software must be clearly marked as such, and if the derived work is | |
12 | * incompatible with the protocol description in the RFC file, it must be | |
13 | * called by a name other than "ssh" or "Secure Shell". | |
14 | * | |
7e7327a1 | 15 | * SSH2 support added by Markus Friedl. |
8341f420 | 16 | * Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved. |
bcbf86ec | 17 | * Copyright (c) 1999 Dug Song. All rights reserved. |
18 | * Copyright (c) 1999 Theo de Raadt. All rights reserved. | |
19 | * | |
20 | * Redistribution and use in source and binary forms, with or without | |
21 | * modification, are permitted provided that the following conditions | |
22 | * are met: | |
23 | * 1. Redistributions of source code must retain the above copyright | |
24 | * notice, this list of conditions and the following disclaimer. | |
25 | * 2. Redistributions in binary form must reproduce the above copyright | |
26 | * notice, this list of conditions and the following disclaimer in the | |
27 | * documentation and/or other materials provided with the distribution. | |
28 | * | |
29 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
30 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
31 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
32 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
33 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
34 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
35 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
36 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
37 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
38 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
5260325f | 39 | */ |
8efc0c15 | 40 | |
41 | #include "includes.h" | |
0d942eff | 42 | RCSID("$OpenBSD: channels.c,v 1.190 2003/05/11 20:30:24 markus Exp $"); |
8efc0c15 | 43 | |
44 | #include "ssh.h" | |
42f11eb2 | 45 | #include "ssh1.h" |
46 | #include "ssh2.h" | |
8efc0c15 | 47 | #include "packet.h" |
48 | #include "xmalloc.h" | |
42f11eb2 | 49 | #include "log.h" |
50 | #include "misc.h" | |
8efc0c15 | 51 | #include "channels.h" |
8efc0c15 | 52 | #include "compat.h" |
42f11eb2 | 53 | #include "canohost.h" |
4c8722d9 | 54 | #include "key.h" |
55 | #include "authfd.h" | |
805e659f | 56 | #include "pathnames.h" |
7e7327a1 | 57 | |
8efc0c15 | 58 | |
8e7895b8 | 59 | /* -- channel core */ |
8efc0c15 | 60 | |
aa3378df | 61 | /* |
62 | * Pointer to an array containing all allocated channels. The array is | |
63 | * dynamically extended as needed. | |
64 | */ | |
719fc62f | 65 | static Channel **channels = NULL; |
8efc0c15 | 66 | |
aa3378df | 67 | /* |
68 | * Size of the channel array. All slots of the array must always be | |
719fc62f | 69 | * initialized (at least the type field); unused slots set to NULL |
aa3378df | 70 | */ |
8efc0c15 | 71 | static int channels_alloc = 0; |
72 | ||
aa3378df | 73 | /* |
74 | * Maximum file descriptor value used in any of the channels. This is | |
719fc62f | 75 | * updated in channel_new. |
aa3378df | 76 | */ |
39929cdb | 77 | static int channel_max_fd = 0; |
8efc0c15 | 78 | |
8efc0c15 | 79 | |
8e7895b8 | 80 | /* -- tcp forwarding */ |
8efc0c15 | 81 | |
aa3378df | 82 | /* |
83 | * Data structure for storing which hosts are permitted for forward requests. | |
84 | * The local sides of any remote forwards are stored in this array to prevent | |
85 | * a corrupt remote server from accessing arbitrary TCP/IP ports on our local | |
86 | * network (which might be behind a firewall). | |
87 | */ | |
5260325f | 88 | typedef struct { |
7368a6c8 | 89 | char *host_to_connect; /* Connect to 'host'. */ |
90 | u_short port_to_connect; /* Connect to 'port'. */ | |
91 | u_short listen_port; /* Remote side should listen port number. */ | |
8efc0c15 | 92 | } ForwardPermission; |
93 | ||
94 | /* List of all permitted host/port pairs to connect. */ | |
95 | static ForwardPermission permitted_opens[SSH_MAX_FORWARDS_PER_DIRECTION]; | |
8e7895b8 | 96 | |
8efc0c15 | 97 | /* Number of permitted host/port pairs in the array. */ |
98 | static int num_permitted_opens = 0; | |
aa3378df | 99 | /* |
100 | * If this is true, all opens are permitted. This is the case on the server | |
101 | * on which we have to trust the client anyway, and the user could do | |
102 | * anything after logging in anyway. | |
103 | */ | |
8efc0c15 | 104 | static int all_opens_permitted = 0; |
105 | ||
8efc0c15 | 106 | |
8e7895b8 | 107 | /* -- X11 forwarding */ |
42f11eb2 | 108 | |
8e7895b8 | 109 | /* Maximum number of fake X11 displays to try. */ |
110 | #define MAX_DISPLAYS 1000 | |
0490e609 | 111 | |
8e7895b8 | 112 | /* Saved X11 authentication protocol name. */ |
113 | static char *x11_saved_proto = NULL; | |
8efc0c15 | 114 | |
8e7895b8 | 115 | /* Saved X11 authentication data. This is the real data. */ |
116 | static char *x11_saved_data = NULL; | |
117 | static u_int x11_saved_data_len = 0; | |
118 | ||
119 | /* | |
120 | * Fake X11 authentication data. This is what the server will be sending us; | |
121 | * we should replace any occurrences of this by the real data. | |
122 | */ | |
123 | static char *x11_fake_data = NULL; | |
124 | static u_int x11_fake_data_len; | |
125 | ||
126 | ||
127 | /* -- agent forwarding */ | |
8efc0c15 | 128 | |
8e7895b8 | 129 | #define NUM_SOCKS 10 |
130 | ||
8e7895b8 | 131 | /* AF_UNSPEC or AF_INET or AF_INET6 */ |
5e4a7219 | 132 | static int IPv4or6 = AF_UNSPEC; |
8e7895b8 | 133 | |
134 | /* helper */ | |
396c147e | 135 | static void port_open_helper(Channel *c, char *rtype); |
8e7895b8 | 136 | |
137 | /* -- channel core */ | |
7368a6c8 | 138 | |
139 | Channel * | |
140 | channel_lookup(int id) | |
141 | { | |
142 | Channel *c; | |
719fc62f | 143 | |
c77d2e56 | 144 | if (id < 0 || id >= channels_alloc) { |
bbe88b6d | 145 | logit("channel_lookup: %d: bad id", id); |
7368a6c8 | 146 | return NULL; |
147 | } | |
719fc62f | 148 | c = channels[id]; |
149 | if (c == NULL) { | |
bbe88b6d | 150 | logit("channel_lookup: %d: bad id: channel free", id); |
7368a6c8 | 151 | return NULL; |
152 | } | |
153 | return c; | |
154 | } | |
155 | ||
aa3378df | 156 | /* |
1d1ffb87 | 157 | * Register filedescriptors for a channel, used when allocating a channel or |
0fbe8c74 | 158 | * when the channel consumer/producer is ready, e.g. shell exec'd |
aa3378df | 159 | */ |
8efc0c15 | 160 | |
396c147e | 161 | static void |
a22aff1f | 162 | channel_register_fds(Channel *c, int rfd, int wfd, int efd, |
163 | int extusage, int nonblock) | |
8efc0c15 | 164 | { |
5260325f | 165 | /* Update the maximum file descriptor value. */ |
39929cdb | 166 | channel_max_fd = MAX(channel_max_fd, rfd); |
167 | channel_max_fd = MAX(channel_max_fd, wfd); | |
168 | channel_max_fd = MAX(channel_max_fd, efd); | |
169 | ||
aa3378df | 170 | /* XXX set close-on-exec -markus */ |
1d1ffb87 | 171 | |
0fbe8c74 | 172 | c->rfd = rfd; |
173 | c->wfd = wfd; | |
174 | c->sock = (rfd == wfd) ? rfd : -1; | |
175 | c->efd = efd; | |
176 | c->extended_usage = extusage; | |
a22aff1f | 177 | |
0ae4fe1d | 178 | /* XXX ugly hack: nonblock is only set by the server */ |
179 | if (nonblock && isatty(c->rfd)) { | |
94dfb550 | 180 | debug("channel %d: rfd %d isatty", c->self, c->rfd); |
0ae4fe1d | 181 | c->isatty = 1; |
182 | if (!isatty(c->wfd)) { | |
94dfb550 | 183 | error("channel %d: wfd %d is not a tty?", |
0ae4fe1d | 184 | c->self, c->wfd); |
185 | } | |
186 | } else { | |
187 | c->isatty = 0; | |
188 | } | |
21c2c5cd | 189 | c->wfd_isatty = isatty(c->wfd); |
0ae4fe1d | 190 | |
a22aff1f | 191 | /* enable nonblocking mode */ |
192 | if (nonblock) { | |
193 | if (rfd != -1) | |
194 | set_nonblock(rfd); | |
195 | if (wfd != -1) | |
196 | set_nonblock(wfd); | |
197 | if (efd != -1) | |
198 | set_nonblock(efd); | |
199 | } | |
0fbe8c74 | 200 | } |
201 | ||
202 | /* | |
203 | * Allocate a new channel object and set its type and socket. This will cause | |
204 | * remote_name to be freed. | |
205 | */ | |
206 | ||
719fc62f | 207 | Channel * |
0fbe8c74 | 208 | channel_new(char *ctype, int type, int rfd, int wfd, int efd, |
f91d9a89 | 209 | u_int window, u_int maxpack, int extusage, char *remote_name, int nonblock) |
0fbe8c74 | 210 | { |
211 | int i, found; | |
212 | Channel *c; | |
5260325f | 213 | |
214 | /* Do initial allocation if this is the first call. */ | |
215 | if (channels_alloc == 0) { | |
216 | channels_alloc = 10; | |
719fc62f | 217 | channels = xmalloc(channels_alloc * sizeof(Channel *)); |
5260325f | 218 | for (i = 0; i < channels_alloc; i++) |
719fc62f | 219 | channels[i] = NULL; |
d6746a0b | 220 | fatal_add_cleanup((void (*) (void *)) channel_free_all, NULL); |
5260325f | 221 | } |
222 | /* Try to find a free slot where to put the new channel. */ | |
223 | for (found = -1, i = 0; i < channels_alloc; i++) | |
719fc62f | 224 | if (channels[i] == NULL) { |
5260325f | 225 | /* Found a free slot. */ |
226 | found = i; | |
227 | break; | |
228 | } | |
229 | if (found == -1) { | |
aa3378df | 230 | /* There are no free slots. Take last+1 slot and expand the array. */ |
5260325f | 231 | found = channels_alloc; |
232 | channels_alloc += 10; | |
5df8c731 | 233 | if (channels_alloc > 10000) |
234 | fatal("channel_new: internal error: channels_alloc %d " | |
235 | "too big.", channels_alloc); | |
de273eef | 236 | debug2("channel: expanding %d", channels_alloc); |
719fc62f | 237 | channels = xrealloc(channels, channels_alloc * sizeof(Channel *)); |
5260325f | 238 | for (i = found; i < channels_alloc; i++) |
719fc62f | 239 | channels[i] = NULL; |
5260325f | 240 | } |
719fc62f | 241 | /* Initialize and return new channel. */ |
242 | c = channels[found] = xmalloc(sizeof(Channel)); | |
639cb8ab | 243 | memset(c, 0, sizeof(Channel)); |
5260325f | 244 | buffer_init(&c->input); |
245 | buffer_init(&c->output); | |
7368a6c8 | 246 | buffer_init(&c->extended); |
70bef40e | 247 | c->ostate = CHAN_OUTPUT_OPEN; |
248 | c->istate = CHAN_INPUT_OPEN; | |
249 | c->flags = 0; | |
a22aff1f | 250 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock); |
5260325f | 251 | c->self = found; |
252 | c->type = type; | |
7368a6c8 | 253 | c->ctype = ctype; |
0b242b12 | 254 | c->local_window = window; |
255 | c->local_window_max = window; | |
256 | c->local_consumed = 0; | |
257 | c->local_maxpacket = maxpack; | |
5260325f | 258 | c->remote_id = -1; |
0d942eff | 259 | c->remote_name = xstrdup(remote_name); |
7368a6c8 | 260 | c->remote_window = 0; |
261 | c->remote_maxpacket = 0; | |
a5f82435 | 262 | c->force_drain = 0; |
ac151b18 | 263 | c->single_connection = 0; |
3cf2be58 | 264 | c->detach_user = NULL; |
05ca0898 | 265 | c->confirm = NULL; |
2e73a022 | 266 | c->input_filter = NULL; |
5260325f | 267 | debug("channel %d: new [%s]", found, remote_name); |
719fc62f | 268 | return c; |
7368a6c8 | 269 | } |
8efc0c15 | 270 | |
489aa2e9 | 271 | static int |
272 | channel_find_maxfd(void) | |
273 | { | |
274 | int i, max = 0; | |
275 | Channel *c; | |
276 | ||
277 | for (i = 0; i < channels_alloc; i++) { | |
278 | c = channels[i]; | |
279 | if (c != NULL) { | |
280 | max = MAX(max, c->rfd); | |
281 | max = MAX(max, c->wfd); | |
282 | max = MAX(max, c->efd); | |
283 | } | |
284 | } | |
285 | return max; | |
286 | } | |
287 | ||
288 | int | |
289 | channel_close_fd(int *fdp) | |
290 | { | |
291 | int ret = 0, fd = *fdp; | |
292 | ||
293 | if (fd != -1) { | |
294 | ret = close(fd); | |
295 | *fdp = -1; | |
296 | if (fd == channel_max_fd) | |
297 | channel_max_fd = channel_find_maxfd(); | |
298 | } | |
299 | return ret; | |
300 | } | |
301 | ||
0fbe8c74 | 302 | /* Close all channel fd/socket. */ |
303 | ||
396c147e | 304 | static void |
0fbe8c74 | 305 | channel_close_fds(Channel *c) |
306 | { | |
6fd8622b | 307 | debug3("channel_close_fds: channel %d: r %d w %d e %d", |
308 | c->self, c->rfd, c->wfd, c->efd); | |
309 | ||
489aa2e9 | 310 | channel_close_fd(&c->sock); |
311 | channel_close_fd(&c->rfd); | |
312 | channel_close_fd(&c->wfd); | |
313 | channel_close_fd(&c->efd); | |
0fbe8c74 | 314 | } |
315 | ||
8e7895b8 | 316 | /* Free the channel and close its fd/socket. */ |
317 | ||
318 | void | |
319 | channel_free(Channel *c) | |
320 | { | |
321 | char *s; | |
322 | int i, n; | |
323 | ||
324 | for (n = 0, i = 0; i < channels_alloc; i++) | |
325 | if (channels[i]) | |
326 | n++; | |
327 | debug("channel_free: channel %d: %s, nchannels %d", c->self, | |
328 | c->remote_name ? c->remote_name : "???", n); | |
329 | ||
330 | s = channel_open_message(); | |
331 | debug3("channel_free: status: %s", s); | |
332 | xfree(s); | |
333 | ||
8e7895b8 | 334 | if (c->sock != -1) |
335 | shutdown(c->sock, SHUT_RDWR); | |
336 | channel_close_fds(c); | |
337 | buffer_free(&c->input); | |
338 | buffer_free(&c->output); | |
339 | buffer_free(&c->extended); | |
340 | if (c->remote_name) { | |
341 | xfree(c->remote_name); | |
342 | c->remote_name = NULL; | |
343 | } | |
344 | channels[c->self] = NULL; | |
345 | xfree(c); | |
346 | } | |
347 | ||
8e7895b8 | 348 | void |
d6746a0b | 349 | channel_free_all(void) |
8e7895b8 | 350 | { |
351 | int i; | |
8e7895b8 | 352 | |
d6746a0b | 353 | for (i = 0; i < channels_alloc; i++) |
354 | if (channels[i] != NULL) | |
355 | channel_free(channels[i]); | |
8e7895b8 | 356 | } |
357 | ||
358 | /* | |
359 | * Closes the sockets/fds of all channels. This is used to close extra file | |
360 | * descriptors after a fork. | |
361 | */ | |
362 | ||
363 | void | |
d5bb9418 | 364 | channel_close_all(void) |
8e7895b8 | 365 | { |
366 | int i; | |
367 | ||
368 | for (i = 0; i < channels_alloc; i++) | |
369 | if (channels[i] != NULL) | |
370 | channel_close_fds(channels[i]); | |
371 | } | |
372 | ||
3cf2be58 | 373 | /* |
374 | * Stop listening to channels. | |
375 | */ | |
376 | ||
377 | void | |
378 | channel_stop_listening(void) | |
379 | { | |
380 | int i; | |
381 | Channel *c; | |
382 | ||
383 | for (i = 0; i < channels_alloc; i++) { | |
384 | c = channels[i]; | |
385 | if (c != NULL) { | |
386 | switch (c->type) { | |
387 | case SSH_CHANNEL_AUTH_SOCKET: | |
388 | case SSH_CHANNEL_PORT_LISTENER: | |
389 | case SSH_CHANNEL_RPORT_LISTENER: | |
390 | case SSH_CHANNEL_X11_LISTENER: | |
489aa2e9 | 391 | channel_close_fd(&c->sock); |
3cf2be58 | 392 | channel_free(c); |
393 | break; | |
394 | } | |
395 | } | |
396 | } | |
397 | } | |
398 | ||
8e7895b8 | 399 | /* |
400 | * Returns true if no channel has too much buffered data, and false if one or | |
401 | * more channel is overfull. | |
402 | */ | |
403 | ||
404 | int | |
d5bb9418 | 405 | channel_not_very_much_buffered_data(void) |
8e7895b8 | 406 | { |
407 | u_int i; | |
408 | Channel *c; | |
409 | ||
410 | for (i = 0; i < channels_alloc; i++) { | |
411 | c = channels[i]; | |
412 | if (c != NULL && c->type == SSH_CHANNEL_OPEN) { | |
0c139bd1 | 413 | #if 0 |
414 | if (!compat20 && | |
415 | buffer_len(&c->input) > packet_get_maxsize()) { | |
faa483fa | 416 | debug2("channel %d: big input buffer %d", |
8e7895b8 | 417 | c->self, buffer_len(&c->input)); |
418 | return 0; | |
419 | } | |
0c139bd1 | 420 | #endif |
8e7895b8 | 421 | if (buffer_len(&c->output) > packet_get_maxsize()) { |
faa483fa | 422 | debug2("channel %d: big output buffer %d > %d", |
0c139bd1 | 423 | c->self, buffer_len(&c->output), |
424 | packet_get_maxsize()); | |
8e7895b8 | 425 | return 0; |
426 | } | |
427 | } | |
428 | } | |
429 | return 1; | |
430 | } | |
431 | ||
432 | /* Returns true if any channel is still open. */ | |
433 | ||
434 | int | |
d5bb9418 | 435 | channel_still_open(void) |
8e7895b8 | 436 | { |
437 | int i; | |
438 | Channel *c; | |
439 | ||
440 | for (i = 0; i < channels_alloc; i++) { | |
441 | c = channels[i]; | |
442 | if (c == NULL) | |
443 | continue; | |
444 | switch (c->type) { | |
445 | case SSH_CHANNEL_X11_LISTENER: | |
446 | case SSH_CHANNEL_PORT_LISTENER: | |
447 | case SSH_CHANNEL_RPORT_LISTENER: | |
448 | case SSH_CHANNEL_CLOSED: | |
449 | case SSH_CHANNEL_AUTH_SOCKET: | |
450 | case SSH_CHANNEL_DYNAMIC: | |
451 | case SSH_CHANNEL_CONNECTING: | |
452 | case SSH_CHANNEL_ZOMBIE: | |
453 | continue; | |
454 | case SSH_CHANNEL_LARVAL: | |
455 | if (!compat20) | |
456 | fatal("cannot happen: SSH_CHANNEL_LARVAL"); | |
457 | continue; | |
458 | case SSH_CHANNEL_OPENING: | |
459 | case SSH_CHANNEL_OPEN: | |
460 | case SSH_CHANNEL_X11_OPEN: | |
461 | return 1; | |
462 | case SSH_CHANNEL_INPUT_DRAINING: | |
463 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
464 | if (!compat13) | |
465 | fatal("cannot happen: OUT_DRAIN"); | |
466 | return 1; | |
467 | default: | |
468 | fatal("channel_still_open: bad channel type %d", c->type); | |
469 | /* NOTREACHED */ | |
470 | } | |
471 | } | |
472 | return 0; | |
473 | } | |
474 | ||
475 | /* Returns the id of an open channel suitable for keepaliving */ | |
476 | ||
477 | int | |
d5bb9418 | 478 | channel_find_open(void) |
8e7895b8 | 479 | { |
480 | int i; | |
481 | Channel *c; | |
482 | ||
483 | for (i = 0; i < channels_alloc; i++) { | |
484 | c = channels[i]; | |
485 | if (c == NULL) | |
486 | continue; | |
487 | switch (c->type) { | |
488 | case SSH_CHANNEL_CLOSED: | |
489 | case SSH_CHANNEL_DYNAMIC: | |
490 | case SSH_CHANNEL_X11_LISTENER: | |
491 | case SSH_CHANNEL_PORT_LISTENER: | |
492 | case SSH_CHANNEL_RPORT_LISTENER: | |
493 | case SSH_CHANNEL_OPENING: | |
494 | case SSH_CHANNEL_CONNECTING: | |
495 | case SSH_CHANNEL_ZOMBIE: | |
496 | continue; | |
497 | case SSH_CHANNEL_LARVAL: | |
498 | case SSH_CHANNEL_AUTH_SOCKET: | |
499 | case SSH_CHANNEL_OPEN: | |
500 | case SSH_CHANNEL_X11_OPEN: | |
501 | return i; | |
502 | case SSH_CHANNEL_INPUT_DRAINING: | |
503 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
504 | if (!compat13) | |
505 | fatal("cannot happen: OUT_DRAIN"); | |
506 | return i; | |
507 | default: | |
508 | fatal("channel_find_open: bad channel type %d", c->type); | |
509 | /* NOTREACHED */ | |
510 | } | |
511 | } | |
512 | return -1; | |
513 | } | |
514 | ||
515 | ||
516 | /* | |
517 | * Returns a message describing the currently open forwarded connections, | |
518 | * suitable for sending to the client. The message contains crlf pairs for | |
519 | * newlines. | |
520 | */ | |
521 | ||
522 | char * | |
d5bb9418 | 523 | channel_open_message(void) |
8e7895b8 | 524 | { |
525 | Buffer buffer; | |
526 | Channel *c; | |
527 | char buf[1024], *cp; | |
528 | int i; | |
529 | ||
530 | buffer_init(&buffer); | |
531 | snprintf(buf, sizeof buf, "The following connections are open:\r\n"); | |
532 | buffer_append(&buffer, buf, strlen(buf)); | |
533 | for (i = 0; i < channels_alloc; i++) { | |
534 | c = channels[i]; | |
535 | if (c == NULL) | |
536 | continue; | |
537 | switch (c->type) { | |
538 | case SSH_CHANNEL_X11_LISTENER: | |
539 | case SSH_CHANNEL_PORT_LISTENER: | |
540 | case SSH_CHANNEL_RPORT_LISTENER: | |
541 | case SSH_CHANNEL_CLOSED: | |
542 | case SSH_CHANNEL_AUTH_SOCKET: | |
543 | case SSH_CHANNEL_ZOMBIE: | |
544 | continue; | |
545 | case SSH_CHANNEL_LARVAL: | |
546 | case SSH_CHANNEL_OPENING: | |
547 | case SSH_CHANNEL_CONNECTING: | |
548 | case SSH_CHANNEL_DYNAMIC: | |
549 | case SSH_CHANNEL_OPEN: | |
550 | case SSH_CHANNEL_X11_OPEN: | |
551 | case SSH_CHANNEL_INPUT_DRAINING: | |
552 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
553 | snprintf(buf, sizeof buf, " #%d %.300s (t%d r%d i%d/%d o%d/%d fd %d/%d)\r\n", | |
554 | c->self, c->remote_name, | |
555 | c->type, c->remote_id, | |
556 | c->istate, buffer_len(&c->input), | |
557 | c->ostate, buffer_len(&c->output), | |
558 | c->rfd, c->wfd); | |
559 | buffer_append(&buffer, buf, strlen(buf)); | |
560 | continue; | |
561 | default: | |
562 | fatal("channel_open_message: bad channel type %d", c->type); | |
563 | /* NOTREACHED */ | |
564 | } | |
565 | } | |
566 | buffer_append(&buffer, "\0", 1); | |
567 | cp = xstrdup(buffer_ptr(&buffer)); | |
568 | buffer_free(&buffer); | |
569 | return cp; | |
570 | } | |
571 | ||
572 | void | |
573 | channel_send_open(int id) | |
574 | { | |
575 | Channel *c = channel_lookup(id); | |
e1feb9bf | 576 | |
8e7895b8 | 577 | if (c == NULL) { |
bbe88b6d | 578 | logit("channel_send_open: %d: bad id", id); |
8e7895b8 | 579 | return; |
580 | } | |
6226a8f8 | 581 | debug2("channel %d: send open", id); |
8e7895b8 | 582 | packet_start(SSH2_MSG_CHANNEL_OPEN); |
583 | packet_put_cstring(c->ctype); | |
584 | packet_put_int(c->self); | |
585 | packet_put_int(c->local_window); | |
586 | packet_put_int(c->local_maxpacket); | |
587 | packet_send(); | |
588 | } | |
589 | ||
590 | void | |
6226a8f8 | 591 | channel_request_start(int id, char *service, int wantconfirm) |
8e7895b8 | 592 | { |
6226a8f8 | 593 | Channel *c = channel_lookup(id); |
e1feb9bf | 594 | |
8e7895b8 | 595 | if (c == NULL) { |
bbe88b6d | 596 | logit("channel_request_start: %d: unknown channel id", id); |
8e7895b8 | 597 | return; |
598 | } | |
6226a8f8 | 599 | debug("channel %d: request %s", id, service) ; |
8e7895b8 | 600 | packet_start(SSH2_MSG_CHANNEL_REQUEST); |
601 | packet_put_int(c->remote_id); | |
602 | packet_put_cstring(service); | |
603 | packet_put_char(wantconfirm); | |
604 | } | |
605 | void | |
05ca0898 | 606 | channel_register_confirm(int id, channel_callback_fn *fn) |
8e7895b8 | 607 | { |
608 | Channel *c = channel_lookup(id); | |
e1feb9bf | 609 | |
8e7895b8 | 610 | if (c == NULL) { |
bbe88b6d | 611 | logit("channel_register_comfirm: %d: bad id", id); |
8e7895b8 | 612 | return; |
613 | } | |
05ca0898 | 614 | c->confirm = fn; |
8e7895b8 | 615 | } |
616 | void | |
617 | channel_register_cleanup(int id, channel_callback_fn *fn) | |
618 | { | |
619 | Channel *c = channel_lookup(id); | |
e1feb9bf | 620 | |
8e7895b8 | 621 | if (c == NULL) { |
bbe88b6d | 622 | logit("channel_register_cleanup: %d: bad id", id); |
8e7895b8 | 623 | return; |
624 | } | |
3cf2be58 | 625 | c->detach_user = fn; |
8e7895b8 | 626 | } |
627 | void | |
628 | channel_cancel_cleanup(int id) | |
629 | { | |
630 | Channel *c = channel_lookup(id); | |
e1feb9bf | 631 | |
8e7895b8 | 632 | if (c == NULL) { |
bbe88b6d | 633 | logit("channel_cancel_cleanup: %d: bad id", id); |
8e7895b8 | 634 | return; |
635 | } | |
3cf2be58 | 636 | c->detach_user = NULL; |
8e7895b8 | 637 | } |
638 | void | |
639 | channel_register_filter(int id, channel_filter_fn *fn) | |
640 | { | |
641 | Channel *c = channel_lookup(id); | |
e1feb9bf | 642 | |
8e7895b8 | 643 | if (c == NULL) { |
bbe88b6d | 644 | logit("channel_register_filter: %d: bad id", id); |
8e7895b8 | 645 | return; |
646 | } | |
647 | c->input_filter = fn; | |
648 | } | |
649 | ||
6ae2364d | 650 | void |
8e7895b8 | 651 | channel_set_fds(int id, int rfd, int wfd, int efd, |
399d1ea6 | 652 | int extusage, int nonblock, u_int window_max) |
8efc0c15 | 653 | { |
8e7895b8 | 654 | Channel *c = channel_lookup(id); |
e1feb9bf | 655 | |
8e7895b8 | 656 | if (c == NULL || c->type != SSH_CHANNEL_LARVAL) |
657 | fatal("channel_activate for non-larval channel %d.", id); | |
658 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock); | |
659 | c->type = SSH_CHANNEL_OPEN; | |
399d1ea6 | 660 | c->local_window = c->local_window_max = window_max; |
8e7895b8 | 661 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
662 | packet_put_int(c->remote_id); | |
663 | packet_put_int(c->local_window); | |
664 | packet_send(); | |
8efc0c15 | 665 | } |
666 | ||
aa3378df | 667 | /* |
7368a6c8 | 668 | * 'channel_pre*' are called just before select() to add any bits relevant to |
669 | * channels in the select bitmasks. | |
aa3378df | 670 | */ |
7368a6c8 | 671 | /* |
672 | * 'channel_post*': perform any appropriate operations for channels which | |
673 | * have events pending. | |
674 | */ | |
675 | typedef void chan_fn(Channel *c, fd_set * readset, fd_set * writeset); | |
676 | chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE]; | |
677 | chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE]; | |
8efc0c15 | 678 | |
396c147e | 679 | static void |
7368a6c8 | 680 | channel_pre_listener(Channel *c, fd_set * readset, fd_set * writeset) |
8efc0c15 | 681 | { |
7368a6c8 | 682 | FD_SET(c->sock, readset); |
683 | } | |
5260325f | 684 | |
396c147e | 685 | static void |
97fb6912 | 686 | channel_pre_connecting(Channel *c, fd_set * readset, fd_set * writeset) |
687 | { | |
688 | debug3("channel %d: waiting for connection", c->self); | |
689 | FD_SET(c->sock, writeset); | |
690 | } | |
691 | ||
396c147e | 692 | static void |
7368a6c8 | 693 | channel_pre_open_13(Channel *c, fd_set * readset, fd_set * writeset) |
694 | { | |
695 | if (buffer_len(&c->input) < packet_get_maxsize()) | |
696 | FD_SET(c->sock, readset); | |
697 | if (buffer_len(&c->output) > 0) | |
698 | FD_SET(c->sock, writeset); | |
699 | } | |
5260325f | 700 | |
396c147e | 701 | static void |
0c0738d5 | 702 | channel_pre_open(Channel *c, fd_set * readset, fd_set * writeset) |
7368a6c8 | 703 | { |
0c0738d5 | 704 | u_int limit = compat20 ? c->remote_window : packet_get_maxsize(); |
5260325f | 705 | |
7e7327a1 | 706 | if (c->istate == CHAN_INPUT_OPEN && |
0c0738d5 | 707 | limit > 0 && |
708 | buffer_len(&c->input) < limit) | |
7e7327a1 | 709 | FD_SET(c->rfd, readset); |
710 | if (c->ostate == CHAN_OUTPUT_OPEN || | |
711 | c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { | |
712 | if (buffer_len(&c->output) > 0) { | |
713 | FD_SET(c->wfd, writeset); | |
714 | } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { | |
d2296ed7 | 715 | if (CHANNEL_EFD_OUTPUT_ACTIVE(c)) |
875ec275 | 716 | debug2("channel %d: obuf_empty delayed efd %d/(%d)", |
717 | c->self, c->efd, buffer_len(&c->extended)); | |
d2296ed7 | 718 | else |
719 | chan_obuf_empty(c); | |
7e7327a1 | 720 | } |
721 | } | |
722 | /** XXX check close conditions, too */ | |
0c0738d5 | 723 | if (compat20 && c->efd != -1) { |
7e7327a1 | 724 | if (c->extended_usage == CHAN_EXTENDED_WRITE && |
725 | buffer_len(&c->extended) > 0) | |
726 | FD_SET(c->efd, writeset); | |
d2296ed7 | 727 | else if (!(c->flags & CHAN_EOF_SENT) && |
728 | c->extended_usage == CHAN_EXTENDED_READ && | |
7e7327a1 | 729 | buffer_len(&c->extended) < c->remote_window) |
730 | FD_SET(c->efd, readset); | |
731 | } | |
732 | } | |
733 | ||
396c147e | 734 | static void |
7368a6c8 | 735 | channel_pre_input_draining(Channel *c, fd_set * readset, fd_set * writeset) |
736 | { | |
737 | if (buffer_len(&c->input) == 0) { | |
738 | packet_start(SSH_MSG_CHANNEL_CLOSE); | |
739 | packet_put_int(c->remote_id); | |
740 | packet_send(); | |
741 | c->type = SSH_CHANNEL_CLOSED; | |
070adba2 | 742 | debug("channel %d: closing after input drain.", c->self); |
7368a6c8 | 743 | } |
744 | } | |
5260325f | 745 | |
396c147e | 746 | static void |
7368a6c8 | 747 | channel_pre_output_draining(Channel *c, fd_set * readset, fd_set * writeset) |
748 | { | |
749 | if (buffer_len(&c->output) == 0) | |
719fc62f | 750 | chan_mark_dead(c); |
6ae2364d | 751 | else |
7368a6c8 | 752 | FD_SET(c->sock, writeset); |
753 | } | |
5260325f | 754 | |
7368a6c8 | 755 | /* |
756 | * This is a special state for X11 authentication spoofing. An opened X11 | |
757 | * connection (when authentication spoofing is being done) remains in this | |
758 | * state until the first packet has been completely read. The authentication | |
759 | * data in that packet is then substituted by the real data if it matches the | |
760 | * fake data, and the channel is put into normal mode. | |
0b242b12 | 761 | * XXX All this happens at the client side. |
8e7895b8 | 762 | * Returns: 0 = need more data, -1 = wrong cookie, 1 = ok |
7368a6c8 | 763 | */ |
396c147e | 764 | static int |
8e7895b8 | 765 | x11_open_helper(Buffer *b) |
7368a6c8 | 766 | { |
1e3b8b07 | 767 | u_char *ucp; |
768 | u_int proto_len, data_len; | |
5260325f | 769 | |
7368a6c8 | 770 | /* Check if the fixed size part of the packet is in buffer. */ |
8e7895b8 | 771 | if (buffer_len(b) < 12) |
7368a6c8 | 772 | return 0; |
773 | ||
774 | /* Parse the lengths of variable-length fields. */ | |
20905a8e | 775 | ucp = buffer_ptr(b); |
7368a6c8 | 776 | if (ucp[0] == 0x42) { /* Byte order MSB first. */ |
777 | proto_len = 256 * ucp[6] + ucp[7]; | |
778 | data_len = 256 * ucp[8] + ucp[9]; | |
779 | } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */ | |
780 | proto_len = ucp[6] + 256 * ucp[7]; | |
781 | data_len = ucp[8] + 256 * ucp[9]; | |
782 | } else { | |
783 | debug("Initial X11 packet contains bad byte order byte: 0x%x", | |
184eed6a | 784 | ucp[0]); |
7368a6c8 | 785 | return -1; |
786 | } | |
5260325f | 787 | |
7368a6c8 | 788 | /* Check if the whole packet is in buffer. */ |
8e7895b8 | 789 | if (buffer_len(b) < |
7368a6c8 | 790 | 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3)) |
791 | return 0; | |
5260325f | 792 | |
7368a6c8 | 793 | /* Check if authentication protocol matches. */ |
794 | if (proto_len != strlen(x11_saved_proto) || | |
795 | memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) { | |
796 | debug("X11 connection uses different authentication protocol."); | |
797 | return -1; | |
798 | } | |
799 | /* Check if authentication data matches our fake data. */ | |
800 | if (data_len != x11_fake_data_len || | |
801 | memcmp(ucp + 12 + ((proto_len + 3) & ~3), | |
802 | x11_fake_data, x11_fake_data_len) != 0) { | |
803 | debug("X11 auth data does not match fake data."); | |
804 | return -1; | |
805 | } | |
806 | /* Check fake data length */ | |
807 | if (x11_fake_data_len != x11_saved_data_len) { | |
808 | error("X11 fake_data_len %d != saved_data_len %d", | |
809 | x11_fake_data_len, x11_saved_data_len); | |
810 | return -1; | |
811 | } | |
812 | /* | |
813 | * Received authentication protocol and data match | |
814 | * our fake data. Substitute the fake data with real | |
815 | * data. | |
816 | */ | |
817 | memcpy(ucp + 12 + ((proto_len + 3) & ~3), | |
818 | x11_saved_data, x11_saved_data_len); | |
819 | return 1; | |
820 | } | |
5260325f | 821 | |
396c147e | 822 | static void |
7368a6c8 | 823 | channel_pre_x11_open_13(Channel *c, fd_set * readset, fd_set * writeset) |
824 | { | |
8e7895b8 | 825 | int ret = x11_open_helper(&c->output); |
e1feb9bf | 826 | |
7368a6c8 | 827 | if (ret == 1) { |
828 | /* Start normal processing for the channel. */ | |
829 | c->type = SSH_CHANNEL_OPEN; | |
a8be9f80 | 830 | channel_pre_open_13(c, readset, writeset); |
7368a6c8 | 831 | } else if (ret == -1) { |
832 | /* | |
833 | * We have received an X11 connection that has bad | |
834 | * authentication information. | |
835 | */ | |
bbe88b6d | 836 | logit("X11 connection rejected because of wrong authentication."); |
7368a6c8 | 837 | buffer_clear(&c->input); |
838 | buffer_clear(&c->output); | |
489aa2e9 | 839 | channel_close_fd(&c->sock); |
7368a6c8 | 840 | c->sock = -1; |
841 | c->type = SSH_CHANNEL_CLOSED; | |
842 | packet_start(SSH_MSG_CHANNEL_CLOSE); | |
843 | packet_put_int(c->remote_id); | |
844 | packet_send(); | |
845 | } | |
846 | } | |
5260325f | 847 | |
396c147e | 848 | static void |
0b242b12 | 849 | channel_pre_x11_open(Channel *c, fd_set * readset, fd_set * writeset) |
7368a6c8 | 850 | { |
8e7895b8 | 851 | int ret = x11_open_helper(&c->output); |
a5f82435 | 852 | |
853 | /* c->force_drain = 1; */ | |
854 | ||
7368a6c8 | 855 | if (ret == 1) { |
856 | c->type = SSH_CHANNEL_OPEN; | |
0c0738d5 | 857 | channel_pre_open(c, readset, writeset); |
7368a6c8 | 858 | } else if (ret == -1) { |
bbe88b6d | 859 | logit("X11 connection rejected because of wrong authentication."); |
7368a6c8 | 860 | debug("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate); |
8341f420 | 861 | chan_read_failed(c); |
862 | buffer_clear(&c->input); | |
863 | chan_ibuf_empty(c); | |
864 | buffer_clear(&c->output); | |
865 | /* for proto v1, the peer will send an IEOF */ | |
866 | if (compat20) | |
867 | chan_write_failed(c); | |
868 | else | |
869 | c->type = SSH_CHANNEL_OPEN; | |
7368a6c8 | 870 | debug("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate); |
871 | } | |
872 | } | |
5260325f | 873 | |
28b9cb4d | 874 | /* try to decode a socks4 header */ |
396c147e | 875 | static int |
28b9cb4d | 876 | channel_decode_socks4(Channel *c, fd_set * readset, fd_set * writeset) |
0490e609 | 877 | { |
661e45a0 | 878 | char *p, *host; |
53b8fe68 | 879 | int len, have, i, found; |
184eed6a | 880 | char username[256]; |
0490e609 | 881 | struct { |
882 | u_int8_t version; | |
883 | u_int8_t command; | |
884 | u_int16_t dest_port; | |
28b9cb4d | 885 | struct in_addr dest_addr; |
0490e609 | 886 | } s4_req, s4_rsp; |
887 | ||
28b9cb4d | 888 | debug2("channel %d: decode socks4", c->self); |
53b8fe68 | 889 | |
890 | have = buffer_len(&c->input); | |
891 | len = sizeof(s4_req); | |
892 | if (have < len) | |
893 | return 0; | |
894 | p = buffer_ptr(&c->input); | |
895 | for (found = 0, i = len; i < have; i++) { | |
896 | if (p[i] == '\0') { | |
897 | found = 1; | |
898 | break; | |
899 | } | |
900 | if (i > 1024) { | |
901 | /* the peer is probably sending garbage */ | |
902 | debug("channel %d: decode socks4: too long", | |
903 | c->self); | |
904 | return -1; | |
905 | } | |
906 | } | |
907 | if (!found) | |
908 | return 0; | |
0490e609 | 909 | buffer_get(&c->input, (char *)&s4_req.version, 1); |
910 | buffer_get(&c->input, (char *)&s4_req.command, 1); | |
911 | buffer_get(&c->input, (char *)&s4_req.dest_port, 2); | |
28b9cb4d | 912 | buffer_get(&c->input, (char *)&s4_req.dest_addr, 4); |
53b8fe68 | 913 | have = buffer_len(&c->input); |
0490e609 | 914 | p = buffer_ptr(&c->input); |
915 | len = strlen(p); | |
6683b40f | 916 | debug2("channel %d: decode socks4: user %s/%d", c->self, p, len); |
0490e609 | 917 | if (len > have) |
28b9cb4d | 918 | fatal("channel %d: decode socks4: len %d > have %d", |
0490e609 | 919 | c->self, len, have); |
920 | strlcpy(username, p, sizeof(username)); | |
921 | buffer_consume(&c->input, len); | |
922 | buffer_consume(&c->input, 1); /* trailing '\0' */ | |
923 | ||
28b9cb4d | 924 | host = inet_ntoa(s4_req.dest_addr); |
0490e609 | 925 | strlcpy(c->path, host, sizeof(c->path)); |
926 | c->host_port = ntohs(s4_req.dest_port); | |
184eed6a | 927 | |
6683b40f | 928 | debug("channel %d: dynamic request: socks4 host %s port %u command %u", |
929 | c->self, host, c->host_port, s4_req.command); | |
0490e609 | 930 | |
28b9cb4d | 931 | if (s4_req.command != 1) { |
932 | debug("channel %d: cannot handle: socks4 cn %d", | |
933 | c->self, s4_req.command); | |
934 | return -1; | |
0490e609 | 935 | } |
28b9cb4d | 936 | s4_rsp.version = 0; /* vn: 0 for reply */ |
937 | s4_rsp.command = 90; /* cd: req granted */ | |
0490e609 | 938 | s4_rsp.dest_port = 0; /* ignored */ |
28b9cb4d | 939 | s4_rsp.dest_addr.s_addr = INADDR_ANY; /* ignored */ |
0490e609 | 940 | buffer_append(&c->output, (char *)&s4_rsp, sizeof(s4_rsp)); |
28b9cb4d | 941 | return 1; |
0490e609 | 942 | } |
943 | ||
28b9cb4d | 944 | /* dynamic port forwarding */ |
396c147e | 945 | static void |
28b9cb4d | 946 | channel_pre_dynamic(Channel *c, fd_set * readset, fd_set * writeset) |
947 | { | |
948 | u_char *p; | |
949 | int have, ret; | |
950 | ||
951 | have = buffer_len(&c->input); | |
639cb8ab | 952 | c->delayed = 0; |
28b9cb4d | 953 | debug2("channel %d: pre_dynamic: have %d", c->self, have); |
070adba2 | 954 | /* buffer_dump(&c->input); */ |
28b9cb4d | 955 | /* check if the fixed size part of the packet is in buffer. */ |
956 | if (have < 4) { | |
957 | /* need more */ | |
958 | FD_SET(c->sock, readset); | |
959 | return; | |
960 | } | |
961 | /* try to guess the protocol */ | |
962 | p = buffer_ptr(&c->input); | |
963 | switch (p[0]) { | |
6683b40f | 964 | case 0x04: |
965 | ret = channel_decode_socks4(c, readset, writeset); | |
966 | break; | |
28b9cb4d | 967 | default: |
968 | ret = -1; | |
969 | break; | |
970 | } | |
971 | if (ret < 0) { | |
719fc62f | 972 | chan_mark_dead(c); |
28b9cb4d | 973 | } else if (ret == 0) { |
974 | debug2("channel %d: pre_dynamic: need more", c->self); | |
975 | /* need more */ | |
976 | FD_SET(c->sock, readset); | |
977 | } else { | |
978 | /* switch to the next state */ | |
979 | c->type = SSH_CHANNEL_OPENING; | |
980 | port_open_helper(c, "direct-tcpip"); | |
981 | } | |
982 | } | |
0490e609 | 983 | |
7368a6c8 | 984 | /* This is our fake X11 server socket. */ |
396c147e | 985 | static void |
7368a6c8 | 986 | channel_post_x11_listener(Channel *c, fd_set * readset, fd_set * writeset) |
987 | { | |
719fc62f | 988 | Channel *nc; |
7368a6c8 | 989 | struct sockaddr addr; |
bcc0381e | 990 | int newsock; |
7368a6c8 | 991 | socklen_t addrlen; |
865ac82e | 992 | char buf[16384], *remote_ipaddr; |
0b242b12 | 993 | int remote_port; |
7368a6c8 | 994 | |
995 | if (FD_ISSET(c->sock, readset)) { | |
996 | debug("X11 connection requested."); | |
997 | addrlen = sizeof(addr); | |
998 | newsock = accept(c->sock, &addr, &addrlen); | |
ac151b18 | 999 | if (c->single_connection) { |
1000 | debug("single_connection: closing X11 listener."); | |
1001 | channel_close_fd(&c->sock); | |
1002 | chan_mark_dead(c); | |
1003 | } | |
7368a6c8 | 1004 | if (newsock < 0) { |
1005 | error("accept: %.100s", strerror(errno)); | |
1006 | return; | |
5260325f | 1007 | } |
bcc0381e | 1008 | set_nodelay(newsock); |
865ac82e | 1009 | remote_ipaddr = get_peer_ipaddr(newsock); |
0b242b12 | 1010 | remote_port = get_peer_port(newsock); |
7368a6c8 | 1011 | snprintf(buf, sizeof buf, "X11 connection from %.200s port %d", |
865ac82e | 1012 | remote_ipaddr, remote_port); |
0b242b12 | 1013 | |
719fc62f | 1014 | nc = channel_new("accepted x11 socket", |
0b242b12 | 1015 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
0d942eff | 1016 | c->local_window_max, c->local_maxpacket, 0, buf, 1); |
0b242b12 | 1017 | if (compat20) { |
1018 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1019 | packet_put_cstring("x11"); | |
719fc62f | 1020 | packet_put_int(nc->self); |
ac151b18 | 1021 | packet_put_int(nc->local_window_max); |
1022 | packet_put_int(nc->local_maxpacket); | |
865ac82e | 1023 | /* originator ipaddr and port */ |
1024 | packet_put_cstring(remote_ipaddr); | |
d0c832f3 | 1025 | if (datafellows & SSH_BUG_X11FWD) { |
1026 | debug("ssh2 x11 bug compat mode"); | |
1027 | } else { | |
1028 | packet_put_int(remote_port); | |
1029 | } | |
0b242b12 | 1030 | packet_send(); |
1031 | } else { | |
1032 | packet_start(SSH_SMSG_X11_OPEN); | |
719fc62f | 1033 | packet_put_int(nc->self); |
8e7895b8 | 1034 | if (packet_get_protocol_flags() & |
1035 | SSH_PROTOFLAG_HOST_IN_FWD_OPEN) | |
449c5ba5 | 1036 | packet_put_cstring(buf); |
0b242b12 | 1037 | packet_send(); |
1038 | } | |
865ac82e | 1039 | xfree(remote_ipaddr); |
8efc0c15 | 1040 | } |
8efc0c15 | 1041 | } |
1042 | ||
396c147e | 1043 | static void |
0490e609 | 1044 | port_open_helper(Channel *c, char *rtype) |
1045 | { | |
1046 | int direct; | |
1047 | char buf[1024]; | |
1048 | char *remote_ipaddr = get_peer_ipaddr(c->sock); | |
1049 | u_short remote_port = get_peer_port(c->sock); | |
1050 | ||
1051 | direct = (strcmp(rtype, "direct-tcpip") == 0); | |
1052 | ||
1053 | snprintf(buf, sizeof buf, | |
1054 | "%s: listening port %d for %.100s port %d, " | |
1055 | "connect from %.200s port %d", | |
1056 | rtype, c->listening_port, c->path, c->host_port, | |
1057 | remote_ipaddr, remote_port); | |
1058 | ||
1059 | xfree(c->remote_name); | |
1060 | c->remote_name = xstrdup(buf); | |
1061 | ||
1062 | if (compat20) { | |
1063 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1064 | packet_put_cstring(rtype); | |
1065 | packet_put_int(c->self); | |
1066 | packet_put_int(c->local_window_max); | |
1067 | packet_put_int(c->local_maxpacket); | |
1068 | if (direct) { | |
1069 | /* target host, port */ | |
1070 | packet_put_cstring(c->path); | |
1071 | packet_put_int(c->host_port); | |
1072 | } else { | |
1073 | /* listen address, port */ | |
1074 | packet_put_cstring(c->path); | |
1075 | packet_put_int(c->listening_port); | |
1076 | } | |
1077 | /* originator host and port */ | |
1078 | packet_put_cstring(remote_ipaddr); | |
1079 | packet_put_int(remote_port); | |
1080 | packet_send(); | |
1081 | } else { | |
1082 | packet_start(SSH_MSG_PORT_OPEN); | |
1083 | packet_put_int(c->self); | |
1084 | packet_put_cstring(c->path); | |
1085 | packet_put_int(c->host_port); | |
8e7895b8 | 1086 | if (packet_get_protocol_flags() & |
1087 | SSH_PROTOFLAG_HOST_IN_FWD_OPEN) | |
0490e609 | 1088 | packet_put_cstring(c->remote_name); |
1089 | packet_send(); | |
1090 | } | |
1091 | xfree(remote_ipaddr); | |
1092 | } | |
1093 | ||
aa3378df | 1094 | /* |
7368a6c8 | 1095 | * This socket is listening for connections to a forwarded TCP/IP port. |
aa3378df | 1096 | */ |
396c147e | 1097 | static void |
7368a6c8 | 1098 | channel_post_port_listener(Channel *c, fd_set * readset, fd_set * writeset) |
1099 | { | |
0490e609 | 1100 | Channel *nc; |
7368a6c8 | 1101 | struct sockaddr addr; |
719fc62f | 1102 | int newsock, nextstate; |
7368a6c8 | 1103 | socklen_t addrlen; |
0490e609 | 1104 | char *rtype; |
fa08c86b | 1105 | |
7368a6c8 | 1106 | if (FD_ISSET(c->sock, readset)) { |
1107 | debug("Connection to port %d forwarding " | |
1108 | "to %.100s port %d requested.", | |
1109 | c->listening_port, c->path, c->host_port); | |
0490e609 | 1110 | |
639cb8ab | 1111 | if (c->type == SSH_CHANNEL_RPORT_LISTENER) { |
1112 | nextstate = SSH_CHANNEL_OPENING; | |
1113 | rtype = "forwarded-tcpip"; | |
1114 | } else { | |
1115 | if (c->host_port == 0) { | |
1116 | nextstate = SSH_CHANNEL_DYNAMIC; | |
f3964cb9 | 1117 | rtype = "dynamic-tcpip"; |
639cb8ab | 1118 | } else { |
1119 | nextstate = SSH_CHANNEL_OPENING; | |
1120 | rtype = "direct-tcpip"; | |
1121 | } | |
1122 | } | |
0490e609 | 1123 | |
7368a6c8 | 1124 | addrlen = sizeof(addr); |
1125 | newsock = accept(c->sock, &addr, &addrlen); | |
1126 | if (newsock < 0) { | |
1127 | error("accept: %.100s", strerror(errno)); | |
1128 | return; | |
1129 | } | |
811a6342 | 1130 | set_nodelay(newsock); |
0d942eff | 1131 | nc = channel_new(rtype, nextstate, newsock, newsock, -1, |
1132 | c->local_window_max, c->local_maxpacket, 0, rtype, 1); | |
0490e609 | 1133 | nc->listening_port = c->listening_port; |
1134 | nc->host_port = c->host_port; | |
1135 | strlcpy(nc->path, c->path, sizeof(nc->path)); | |
1136 | ||
639cb8ab | 1137 | if (nextstate == SSH_CHANNEL_DYNAMIC) { |
1138 | /* | |
1139 | * do not call the channel_post handler until | |
1140 | * this flag has been reset by a pre-handler. | |
1141 | * otherwise the FD_ISSET calls might overflow | |
1142 | */ | |
1143 | nc->delayed = 1; | |
1144 | } else { | |
0490e609 | 1145 | port_open_helper(nc, rtype); |
639cb8ab | 1146 | } |
7368a6c8 | 1147 | } |
1148 | } | |
8efc0c15 | 1149 | |
7368a6c8 | 1150 | /* |
1151 | * This is the authentication agent socket listening for connections from | |
1152 | * clients. | |
1153 | */ | |
396c147e | 1154 | static void |
7368a6c8 | 1155 | channel_post_auth_listener(Channel *c, fd_set * readset, fd_set * writeset) |
8efc0c15 | 1156 | { |
719fc62f | 1157 | Channel *nc; |
1158 | int newsock; | |
5260325f | 1159 | struct sockaddr addr; |
48e671d5 | 1160 | socklen_t addrlen; |
5260325f | 1161 | |
7368a6c8 | 1162 | if (FD_ISSET(c->sock, readset)) { |
1163 | addrlen = sizeof(addr); | |
1164 | newsock = accept(c->sock, &addr, &addrlen); | |
1165 | if (newsock < 0) { | |
1166 | error("accept from auth socket: %.100s", strerror(errno)); | |
1167 | return; | |
1168 | } | |
719fc62f | 1169 | nc = channel_new("accepted auth socket", |
fa08c86b | 1170 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
1171 | c->local_window_max, c->local_maxpacket, | |
0d942eff | 1172 | 0, "accepted auth socket", 1); |
fa08c86b | 1173 | if (compat20) { |
1174 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1175 | packet_put_cstring("auth-agent@openssh.com"); | |
719fc62f | 1176 | packet_put_int(nc->self); |
fa08c86b | 1177 | packet_put_int(c->local_window_max); |
1178 | packet_put_int(c->local_maxpacket); | |
1179 | } else { | |
1180 | packet_start(SSH_SMSG_AGENT_OPEN); | |
719fc62f | 1181 | packet_put_int(nc->self); |
fa08c86b | 1182 | } |
7368a6c8 | 1183 | packet_send(); |
1184 | } | |
1185 | } | |
5260325f | 1186 | |
396c147e | 1187 | static void |
97fb6912 | 1188 | channel_post_connecting(Channel *c, fd_set * readset, fd_set * writeset) |
1189 | { | |
d18e0850 | 1190 | int err = 0; |
8ab2cb35 | 1191 | socklen_t sz = sizeof(err); |
d18e0850 | 1192 | |
97fb6912 | 1193 | if (FD_ISSET(c->sock, writeset)) { |
db518d9b | 1194 | if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, &err, &sz) < 0) { |
d18e0850 | 1195 | err = errno; |
1196 | error("getsockopt SO_ERROR failed"); | |
1197 | } | |
1198 | if (err == 0) { | |
1199 | debug("channel %d: connected", c->self); | |
1200 | c->type = SSH_CHANNEL_OPEN; | |
1201 | if (compat20) { | |
1202 | packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1203 | packet_put_int(c->remote_id); | |
1204 | packet_put_int(c->self); | |
1205 | packet_put_int(c->local_window); | |
1206 | packet_put_int(c->local_maxpacket); | |
1207 | } else { | |
1208 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1209 | packet_put_int(c->remote_id); | |
1210 | packet_put_int(c->self); | |
1211 | } | |
97fb6912 | 1212 | } else { |
d18e0850 | 1213 | debug("channel %d: not connected: %s", |
1214 | c->self, strerror(err)); | |
1215 | if (compat20) { | |
1216 | packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); | |
1217 | packet_put_int(c->remote_id); | |
1218 | packet_put_int(SSH2_OPEN_CONNECT_FAILED); | |
1219 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { | |
1220 | packet_put_cstring(strerror(err)); | |
1221 | packet_put_cstring(""); | |
1222 | } | |
97fb6912 | 1223 | } else { |
d18e0850 | 1224 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
1225 | packet_put_int(c->remote_id); | |
97fb6912 | 1226 | } |
d18e0850 | 1227 | chan_mark_dead(c); |
97fb6912 | 1228 | } |
d18e0850 | 1229 | packet_send(); |
97fb6912 | 1230 | } |
1231 | } | |
1232 | ||
396c147e | 1233 | static int |
7368a6c8 | 1234 | channel_handle_rfd(Channel *c, fd_set * readset, fd_set * writeset) |
1235 | { | |
1236 | char buf[16*1024]; | |
1237 | int len; | |
1238 | ||
6fd8622b | 1239 | if (c->rfd != -1 && |
7368a6c8 | 1240 | FD_ISSET(c->rfd, readset)) { |
1241 | len = read(c->rfd, buf, sizeof(buf)); | |
0fbe8c74 | 1242 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
1243 | return 1; | |
7368a6c8 | 1244 | if (len <= 0) { |
0b242b12 | 1245 | debug("channel %d: read<=0 rfd %d len %d", |
7368a6c8 | 1246 | c->self, c->rfd, len); |
28b9cb4d | 1247 | if (c->type != SSH_CHANNEL_OPEN) { |
1248 | debug("channel %d: not open", c->self); | |
719fc62f | 1249 | chan_mark_dead(c); |
0490e609 | 1250 | return -1; |
28b9cb4d | 1251 | } else if (compat13) { |
9c50edcf | 1252 | buffer_clear(&c->output); |
7368a6c8 | 1253 | c->type = SSH_CHANNEL_INPUT_DRAINING; |
8e7895b8 | 1254 | debug("channel %d: input draining.", c->self); |
7368a6c8 | 1255 | } else { |
1256 | chan_read_failed(c); | |
5260325f | 1257 | } |
7368a6c8 | 1258 | return -1; |
1259 | } | |
6aacefa7 | 1260 | if (c->input_filter != NULL) { |
2e73a022 | 1261 | if (c->input_filter(c, buf, len) == -1) { |
070adba2 | 1262 | debug("channel %d: filter stops", c->self); |
2e73a022 | 1263 | chan_read_failed(c); |
1264 | } | |
1265 | } else { | |
1266 | buffer_append(&c->input, buf, len); | |
1267 | } | |
7368a6c8 | 1268 | } |
1269 | return 1; | |
1270 | } | |
396c147e | 1271 | static int |
7368a6c8 | 1272 | channel_handle_wfd(Channel *c, fd_set * readset, fd_set * writeset) |
1273 | { | |
95ce5599 | 1274 | struct termios tio; |
780a9951 | 1275 | u_char *data; |
1276 | u_int dlen; | |
7368a6c8 | 1277 | int len; |
1278 | ||
1279 | /* Send buffered output data to the socket. */ | |
6fd8622b | 1280 | if (c->wfd != -1 && |
7368a6c8 | 1281 | FD_ISSET(c->wfd, writeset) && |
1282 | buffer_len(&c->output) > 0) { | |
780a9951 | 1283 | data = buffer_ptr(&c->output); |
1284 | dlen = buffer_len(&c->output); | |
64c0ce80 | 1285 | #ifdef _AIX |
1286 | /* XXX: Later AIX versions can't push as much data to tty */ | |
21c2c5cd | 1287 | if (compat20 && c->wfd_isatty && dlen > 8*1024) |
64c0ce80 | 1288 | dlen = 8*1024; |
1289 | #endif | |
21c2c5cd | 1290 | len = write(c->wfd, data, dlen); |
0fbe8c74 | 1291 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
1292 | return 1; | |
7368a6c8 | 1293 | if (len <= 0) { |
28b9cb4d | 1294 | if (c->type != SSH_CHANNEL_OPEN) { |
1295 | debug("channel %d: not open", c->self); | |
719fc62f | 1296 | chan_mark_dead(c); |
28b9cb4d | 1297 | return -1; |
1298 | } else if (compat13) { | |
9c50edcf | 1299 | buffer_clear(&c->output); |
8e7895b8 | 1300 | debug("channel %d: input draining.", c->self); |
7368a6c8 | 1301 | c->type = SSH_CHANNEL_INPUT_DRAINING; |
1302 | } else { | |
1303 | chan_write_failed(c); | |
5260325f | 1304 | } |
7368a6c8 | 1305 | return -1; |
1306 | } | |
780a9951 | 1307 | if (compat20 && c->isatty && dlen >= 1 && data[0] != '\r') { |
0ae4fe1d | 1308 | if (tcgetattr(c->wfd, &tio) == 0 && |
1309 | !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) { | |
1310 | /* | |
1311 | * Simulate echo to reduce the impact of | |
355724fc | 1312 | * traffic analysis. We need to match the |
95ce5599 | 1313 | * size of a SSH2_MSG_CHANNEL_DATA message |
1314 | * (4 byte channel id + data) | |
0ae4fe1d | 1315 | */ |
95ce5599 | 1316 | packet_send_ignore(4 + len); |
0ae4fe1d | 1317 | packet_send(); |
0ae4fe1d | 1318 | } |
1319 | } | |
7368a6c8 | 1320 | buffer_consume(&c->output, len); |
7e7327a1 | 1321 | if (compat20 && len > 0) { |
1322 | c->local_consumed += len; | |
1323 | } | |
1324 | } | |
1325 | return 1; | |
1326 | } | |
396c147e | 1327 | static int |
7e7327a1 | 1328 | channel_handle_efd(Channel *c, fd_set * readset, fd_set * writeset) |
1329 | { | |
1330 | char buf[16*1024]; | |
1331 | int len; | |
1332 | ||
8ce64345 | 1333 | /** XXX handle drain efd, too */ |
7e7327a1 | 1334 | if (c->efd != -1) { |
1335 | if (c->extended_usage == CHAN_EXTENDED_WRITE && | |
1336 | FD_ISSET(c->efd, writeset) && | |
1337 | buffer_len(&c->extended) > 0) { | |
1338 | len = write(c->efd, buffer_ptr(&c->extended), | |
1339 | buffer_len(&c->extended)); | |
de273eef | 1340 | debug2("channel %d: written %d to efd %d", |
7e7327a1 | 1341 | c->self, len, c->efd); |
ee55dacf | 1342 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
1343 | return 1; | |
1344 | if (len <= 0) { | |
1345 | debug2("channel %d: closing write-efd %d", | |
1346 | c->self, c->efd); | |
489aa2e9 | 1347 | channel_close_fd(&c->efd); |
ee55dacf | 1348 | } else { |
7e7327a1 | 1349 | buffer_consume(&c->extended, len); |
1350 | c->local_consumed += len; | |
1351 | } | |
1352 | } else if (c->extended_usage == CHAN_EXTENDED_READ && | |
1353 | FD_ISSET(c->efd, readset)) { | |
1354 | len = read(c->efd, buf, sizeof(buf)); | |
de273eef | 1355 | debug2("channel %d: read %d from efd %d", |
184eed6a | 1356 | c->self, len, c->efd); |
ee55dacf | 1357 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
1358 | return 1; | |
1359 | if (len <= 0) { | |
1360 | debug2("channel %d: closing read-efd %d", | |
8ce64345 | 1361 | c->self, c->efd); |
489aa2e9 | 1362 | channel_close_fd(&c->efd); |
ee55dacf | 1363 | } else { |
7e7327a1 | 1364 | buffer_append(&c->extended, buf, len); |
ee55dacf | 1365 | } |
7e7327a1 | 1366 | } |
1367 | } | |
1368 | return 1; | |
1369 | } | |
396c147e | 1370 | static int |
ee55dacf | 1371 | channel_check_window(Channel *c) |
7e7327a1 | 1372 | { |
28b9cb4d | 1373 | if (c->type == SSH_CHANNEL_OPEN && |
1374 | !(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) && | |
7e7327a1 | 1375 | c->local_window < c->local_window_max/2 && |
1376 | c->local_consumed > 0) { | |
1377 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); | |
1378 | packet_put_int(c->remote_id); | |
1379 | packet_put_int(c->local_consumed); | |
1380 | packet_send(); | |
de273eef | 1381 | debug2("channel %d: window %d sent adjust %d", |
7e7327a1 | 1382 | c->self, c->local_window, |
1383 | c->local_consumed); | |
1384 | c->local_window += c->local_consumed; | |
1385 | c->local_consumed = 0; | |
7368a6c8 | 1386 | } |
1387 | return 1; | |
1388 | } | |
5260325f | 1389 | |
396c147e | 1390 | static void |
0c0738d5 | 1391 | channel_post_open(Channel *c, fd_set * readset, fd_set * writeset) |
7368a6c8 | 1392 | { |
639cb8ab | 1393 | if (c->delayed) |
1394 | return; | |
7368a6c8 | 1395 | channel_handle_rfd(c, readset, writeset); |
1396 | channel_handle_wfd(c, readset, writeset); | |
0c0738d5 | 1397 | if (!compat20) |
639cb8ab | 1398 | return; |
7e7327a1 | 1399 | channel_handle_efd(c, readset, writeset); |
ee55dacf | 1400 | channel_check_window(c); |
7e7327a1 | 1401 | } |
1402 | ||
396c147e | 1403 | static void |
7368a6c8 | 1404 | channel_post_output_drain_13(Channel *c, fd_set * readset, fd_set * writeset) |
1405 | { | |
1406 | int len; | |
e1feb9bf | 1407 | |
7368a6c8 | 1408 | /* Send buffered output data to the socket. */ |
1409 | if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) { | |
1410 | len = write(c->sock, buffer_ptr(&c->output), | |
1411 | buffer_len(&c->output)); | |
1412 | if (len <= 0) | |
9c50edcf | 1413 | buffer_clear(&c->output); |
7368a6c8 | 1414 | else |
1415 | buffer_consume(&c->output, len); | |
1416 | } | |
1417 | } | |
5260325f | 1418 | |
396c147e | 1419 | static void |
7e7327a1 | 1420 | channel_handler_init_20(void) |
1421 | { | |
0c0738d5 | 1422 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open; |
0b242b12 | 1423 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
7e7327a1 | 1424 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; |
fa08c86b | 1425 | channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener; |
0b242b12 | 1426 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
fa08c86b | 1427 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; |
97fb6912 | 1428 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1429 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7e7327a1 | 1430 | |
0c0738d5 | 1431 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
7e7327a1 | 1432 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; |
fa08c86b | 1433 | channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener; |
0b242b12 | 1434 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
fa08c86b | 1435 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; |
97fb6912 | 1436 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 1437 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
7e7327a1 | 1438 | } |
1439 | ||
396c147e | 1440 | static void |
7368a6c8 | 1441 | channel_handler_init_13(void) |
1442 | { | |
1443 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13; | |
1444 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_13; | |
1445 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; | |
1446 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; | |
1447 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; | |
1448 | channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining; | |
1449 | channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining; | |
97fb6912 | 1450 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1451 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7368a6c8 | 1452 | |
0c0738d5 | 1453 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
7368a6c8 | 1454 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
1455 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; | |
1456 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; | |
1457 | channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13; | |
97fb6912 | 1458 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 1459 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
7368a6c8 | 1460 | } |
5260325f | 1461 | |
396c147e | 1462 | static void |
7368a6c8 | 1463 | channel_handler_init_15(void) |
1464 | { | |
0c0738d5 | 1465 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open; |
0b242b12 | 1466 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
7368a6c8 | 1467 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
1468 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; | |
1469 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; | |
97fb6912 | 1470 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1471 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7368a6c8 | 1472 | |
1473 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; | |
1474 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; | |
1475 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; | |
0c0738d5 | 1476 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
97fb6912 | 1477 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 1478 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
7368a6c8 | 1479 | } |
1480 | ||
396c147e | 1481 | static void |
7368a6c8 | 1482 | channel_handler_init(void) |
1483 | { | |
1484 | int i; | |
e1feb9bf | 1485 | |
184eed6a | 1486 | for (i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) { |
7368a6c8 | 1487 | channel_pre[i] = NULL; |
1488 | channel_post[i] = NULL; | |
1489 | } | |
7e7327a1 | 1490 | if (compat20) |
1491 | channel_handler_init_20(); | |
1492 | else if (compat13) | |
7368a6c8 | 1493 | channel_handler_init_13(); |
1494 | else | |
1495 | channel_handler_init_15(); | |
1496 | } | |
1497 | ||
418e724c | 1498 | /* gc dead channels */ |
1499 | static void | |
1500 | channel_garbage_collect(Channel *c) | |
1501 | { | |
1502 | if (c == NULL) | |
1503 | return; | |
1504 | if (c->detach_user != NULL) { | |
1505 | if (!chan_is_dead(c, 0)) | |
1506 | return; | |
1507 | debug("channel %d: gc: notify user", c->self); | |
1508 | c->detach_user(c->self, NULL); | |
1509 | /* if we still have a callback */ | |
1510 | if (c->detach_user != NULL) | |
1511 | return; | |
1512 | debug("channel %d: gc: user detached", c->self); | |
1513 | } | |
1514 | if (!chan_is_dead(c, 1)) | |
1515 | return; | |
1516 | debug("channel %d: garbage collecting", c->self); | |
1517 | channel_free(c); | |
1518 | } | |
1519 | ||
396c147e | 1520 | static void |
7368a6c8 | 1521 | channel_handler(chan_fn *ftab[], fd_set * readset, fd_set * writeset) |
1522 | { | |
1523 | static int did_init = 0; | |
1524 | int i; | |
1525 | Channel *c; | |
1526 | ||
1527 | if (!did_init) { | |
1528 | channel_handler_init(); | |
1529 | did_init = 1; | |
1530 | } | |
1531 | for (i = 0; i < channels_alloc; i++) { | |
719fc62f | 1532 | c = channels[i]; |
1533 | if (c == NULL) | |
5260325f | 1534 | continue; |
6fd8622b | 1535 | if (ftab[c->type] != NULL) |
1536 | (*ftab[c->type])(c, readset, writeset); | |
418e724c | 1537 | channel_garbage_collect(c); |
8efc0c15 | 1538 | } |
8efc0c15 | 1539 | } |
1540 | ||
8e7895b8 | 1541 | /* |
1542 | * Allocate/update select bitmasks and add any bits relevant to channels in | |
1543 | * select bitmasks. | |
1544 | */ | |
6ae2364d | 1545 | void |
c422989b | 1546 | channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp, |
489aa2e9 | 1547 | int *nallocp, int rekeying) |
7368a6c8 | 1548 | { |
39929cdb | 1549 | int n; |
1550 | u_int sz; | |
1551 | ||
1552 | n = MAX(*maxfdp, channel_max_fd); | |
1553 | ||
1554 | sz = howmany(n+1, NFDBITS) * sizeof(fd_mask); | |
489aa2e9 | 1555 | /* perhaps check sz < nalloc/2 and shrink? */ |
1556 | if (*readsetp == NULL || sz > *nallocp) { | |
1557 | *readsetp = xrealloc(*readsetp, sz); | |
1558 | *writesetp = xrealloc(*writesetp, sz); | |
1559 | *nallocp = sz; | |
39929cdb | 1560 | } |
489aa2e9 | 1561 | *maxfdp = n; |
39929cdb | 1562 | memset(*readsetp, 0, sz); |
1563 | memset(*writesetp, 0, sz); | |
1564 | ||
c422989b | 1565 | if (!rekeying) |
1566 | channel_handler(channel_pre, *readsetp, *writesetp); | |
7368a6c8 | 1567 | } |
1568 | ||
8e7895b8 | 1569 | /* |
1570 | * After select, perform any appropriate operations for channels which have | |
1571 | * events pending. | |
1572 | */ | |
6ae2364d | 1573 | void |
7368a6c8 | 1574 | channel_after_select(fd_set * readset, fd_set * writeset) |
1575 | { | |
1576 | channel_handler(channel_post, readset, writeset); | |
1577 | } | |
1578 | ||
8e7895b8 | 1579 | |
39929cdb | 1580 | /* If there is data to send to the connection, enqueue some of it now. */ |
8efc0c15 | 1581 | |
6ae2364d | 1582 | void |
d5bb9418 | 1583 | channel_output_poll(void) |
8efc0c15 | 1584 | { |
7368a6c8 | 1585 | Channel *c; |
f91d9a89 | 1586 | int i; |
1587 | u_int len; | |
5260325f | 1588 | |
1589 | for (i = 0; i < channels_alloc; i++) { | |
719fc62f | 1590 | c = channels[i]; |
1591 | if (c == NULL) | |
1592 | continue; | |
48e671d5 | 1593 | |
8e7895b8 | 1594 | /* |
1595 | * We are only interested in channels that can have buffered | |
1596 | * incoming data. | |
1597 | */ | |
48e671d5 | 1598 | if (compat13) { |
7368a6c8 | 1599 | if (c->type != SSH_CHANNEL_OPEN && |
1600 | c->type != SSH_CHANNEL_INPUT_DRAINING) | |
48e671d5 | 1601 | continue; |
1602 | } else { | |
7368a6c8 | 1603 | if (c->type != SSH_CHANNEL_OPEN) |
48e671d5 | 1604 | continue; |
48e671d5 | 1605 | } |
e78a59f5 | 1606 | if (compat20 && |
1607 | (c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) { | |
ee55dacf | 1608 | /* XXX is this true? */ |
418e724c | 1609 | debug3("channel %d: will not send data after close", c->self); |
7e7327a1 | 1610 | continue; |
1611 | } | |
5260325f | 1612 | |
1613 | /* Get the amount of buffered data for this channel. */ | |
ee55dacf | 1614 | if ((c->istate == CHAN_INPUT_OPEN || |
1615 | c->istate == CHAN_INPUT_WAIT_DRAIN) && | |
1616 | (len = buffer_len(&c->input)) > 0) { | |
8e7895b8 | 1617 | /* |
1618 | * Send some data for the other side over the secure | |
1619 | * connection. | |
1620 | */ | |
7e7327a1 | 1621 | if (compat20) { |
1622 | if (len > c->remote_window) | |
1623 | len = c->remote_window; | |
1624 | if (len > c->remote_maxpacket) | |
1625 | len = c->remote_maxpacket; | |
5260325f | 1626 | } else { |
7e7327a1 | 1627 | if (packet_is_interactive()) { |
1628 | if (len > 1024) | |
1629 | len = 512; | |
1630 | } else { | |
1631 | /* Keep the packets at reasonable size. */ | |
1632 | if (len > packet_get_maxsize()/2) | |
1633 | len = packet_get_maxsize()/2; | |
1634 | } | |
5260325f | 1635 | } |
7368a6c8 | 1636 | if (len > 0) { |
7e7327a1 | 1637 | packet_start(compat20 ? |
1638 | SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA); | |
7368a6c8 | 1639 | packet_put_int(c->remote_id); |
1640 | packet_put_string(buffer_ptr(&c->input), len); | |
1641 | packet_send(); | |
1642 | buffer_consume(&c->input, len); | |
1643 | c->remote_window -= len; | |
7368a6c8 | 1644 | } |
1645 | } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) { | |
5260325f | 1646 | if (compat13) |
1647 | fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3"); | |
aa3378df | 1648 | /* |
1649 | * input-buffer is empty and read-socket shutdown: | |
d2296ed7 | 1650 | * tell peer, that we will not send more data: send IEOF. |
1651 | * hack for extended data: delay EOF if EFD still in use. | |
aa3378df | 1652 | */ |
d2296ed7 | 1653 | if (CHANNEL_EFD_INPUT_ACTIVE(c)) |
875ec275 | 1654 | debug2("channel %d: ibuf_empty delayed efd %d/(%d)", |
1655 | c->self, c->efd, buffer_len(&c->extended)); | |
d2296ed7 | 1656 | else |
1657 | chan_ibuf_empty(c); | |
5260325f | 1658 | } |
7e7327a1 | 1659 | /* Send extended data, i.e. stderr */ |
1660 | if (compat20 && | |
d2296ed7 | 1661 | !(c->flags & CHAN_EOF_SENT) && |
7e7327a1 | 1662 | c->remote_window > 0 && |
1663 | (len = buffer_len(&c->extended)) > 0 && | |
1664 | c->extended_usage == CHAN_EXTENDED_READ) { | |
f91d9a89 | 1665 | debug2("channel %d: rwin %u elen %u euse %d", |
ee55dacf | 1666 | c->self, c->remote_window, buffer_len(&c->extended), |
1667 | c->extended_usage); | |
7e7327a1 | 1668 | if (len > c->remote_window) |
1669 | len = c->remote_window; | |
1670 | if (len > c->remote_maxpacket) | |
1671 | len = c->remote_maxpacket; | |
1672 | packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA); | |
1673 | packet_put_int(c->remote_id); | |
1674 | packet_put_int(SSH2_EXTENDED_DATA_STDERR); | |
1675 | packet_put_string(buffer_ptr(&c->extended), len); | |
1676 | packet_send(); | |
1677 | buffer_consume(&c->extended, len); | |
1678 | c->remote_window -= len; | |
ee55dacf | 1679 | debug2("channel %d: sent ext data %d", c->self, len); |
7e7327a1 | 1680 | } |
8efc0c15 | 1681 | } |
8efc0c15 | 1682 | } |
1683 | ||
8e7895b8 | 1684 | |
1685 | /* -- protocol input */ | |
8efc0c15 | 1686 | |
6ae2364d | 1687 | void |
7819b5c3 | 1688 | channel_input_data(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 1689 | { |
48e671d5 | 1690 | int id; |
5260325f | 1691 | char *data; |
1e3b8b07 | 1692 | u_int data_len; |
7368a6c8 | 1693 | Channel *c; |
5260325f | 1694 | |
1695 | /* Get the channel number and verify it. */ | |
48e671d5 | 1696 | id = packet_get_int(); |
7368a6c8 | 1697 | c = channel_lookup(id); |
1698 | if (c == NULL) | |
48e671d5 | 1699 | packet_disconnect("Received data for nonexistent channel %d.", id); |
5260325f | 1700 | |
1701 | /* Ignore any data for non-open channels (might happen on close) */ | |
7368a6c8 | 1702 | if (c->type != SSH_CHANNEL_OPEN && |
1703 | c->type != SSH_CHANNEL_X11_OPEN) | |
48e671d5 | 1704 | return; |
1705 | ||
1706 | /* same for protocol 1.5 if output end is no longer open */ | |
7368a6c8 | 1707 | if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN) |
5260325f | 1708 | return; |
1709 | ||
1710 | /* Get the data. */ | |
1711 | data = packet_get_string(&data_len); | |
7368a6c8 | 1712 | |
6aacefa7 | 1713 | if (compat20) { |
7e7327a1 | 1714 | if (data_len > c->local_maxpacket) { |
bbe88b6d | 1715 | logit("channel %d: rcvd big packet %d, maxpack %d", |
7e7327a1 | 1716 | c->self, data_len, c->local_maxpacket); |
1717 | } | |
1718 | if (data_len > c->local_window) { | |
bbe88b6d | 1719 | logit("channel %d: rcvd too much data %d, win %d", |
7e7327a1 | 1720 | c->self, data_len, c->local_window); |
1721 | xfree(data); | |
1722 | return; | |
1723 | } | |
1724 | c->local_window -= data_len; | |
7e7327a1 | 1725 | } |
95500969 | 1726 | packet_check_eom(); |
7368a6c8 | 1727 | buffer_append(&c->output, data, data_len); |
5260325f | 1728 | xfree(data); |
8efc0c15 | 1729 | } |
8e7895b8 | 1730 | |
6ae2364d | 1731 | void |
7819b5c3 | 1732 | channel_input_extended_data(int type, u_int32_t seq, void *ctxt) |
7e7327a1 | 1733 | { |
1734 | int id; | |
7e7327a1 | 1735 | char *data; |
a594fa74 | 1736 | u_int data_len, tcode; |
7e7327a1 | 1737 | Channel *c; |
1738 | ||
1739 | /* Get the channel number and verify it. */ | |
1740 | id = packet_get_int(); | |
1741 | c = channel_lookup(id); | |
1742 | ||
1743 | if (c == NULL) | |
1744 | packet_disconnect("Received extended_data for bad channel %d.", id); | |
1745 | if (c->type != SSH_CHANNEL_OPEN) { | |
bbe88b6d | 1746 | logit("channel %d: ext data for non open", id); |
7e7327a1 | 1747 | return; |
1748 | } | |
d2296ed7 | 1749 | if (c->flags & CHAN_EOF_RCVD) { |
1750 | if (datafellows & SSH_BUG_EXTEOF) | |
1751 | debug("channel %d: accepting ext data after eof", id); | |
1752 | else | |
1753 | packet_disconnect("Received extended_data after EOF " | |
1754 | "on channel %d.", id); | |
1755 | } | |
7e7327a1 | 1756 | tcode = packet_get_int(); |
1757 | if (c->efd == -1 || | |
1758 | c->extended_usage != CHAN_EXTENDED_WRITE || | |
1759 | tcode != SSH2_EXTENDED_DATA_STDERR) { | |
bbe88b6d | 1760 | logit("channel %d: bad ext data", c->self); |
7e7327a1 | 1761 | return; |
1762 | } | |
1763 | data = packet_get_string(&data_len); | |
95500969 | 1764 | packet_check_eom(); |
7e7327a1 | 1765 | if (data_len > c->local_window) { |
bbe88b6d | 1766 | logit("channel %d: rcvd too much extended_data %d, win %d", |
7e7327a1 | 1767 | c->self, data_len, c->local_window); |
1768 | xfree(data); | |
1769 | return; | |
1770 | } | |
de273eef | 1771 | debug2("channel %d: rcvd ext data %d", c->self, data_len); |
7e7327a1 | 1772 | c->local_window -= data_len; |
1773 | buffer_append(&c->extended, data, data_len); | |
1774 | xfree(data); | |
1775 | } | |
1776 | ||
6ae2364d | 1777 | void |
7819b5c3 | 1778 | channel_input_ieof(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 1779 | { |
1780 | int id; | |
1781 | Channel *c; | |
1782 | ||
7368a6c8 | 1783 | id = packet_get_int(); |
95500969 | 1784 | packet_check_eom(); |
7368a6c8 | 1785 | c = channel_lookup(id); |
1786 | if (c == NULL) | |
1787 | packet_disconnect("Received ieof for nonexistent channel %d.", id); | |
1788 | chan_rcvd_ieof(c); | |
a5f82435 | 1789 | |
1790 | /* XXX force input close */ | |
8341f420 | 1791 | if (c->force_drain && c->istate == CHAN_INPUT_OPEN) { |
a5f82435 | 1792 | debug("channel %d: FORCE input drain", c->self); |
1793 | c->istate = CHAN_INPUT_WAIT_DRAIN; | |
32e7d71f | 1794 | if (buffer_len(&c->input) == 0) |
1795 | chan_ibuf_empty(c); | |
a5f82435 | 1796 | } |
1797 | ||
7368a6c8 | 1798 | } |
8efc0c15 | 1799 | |
6ae2364d | 1800 | void |
7819b5c3 | 1801 | channel_input_close(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 1802 | { |
7368a6c8 | 1803 | int id; |
1804 | Channel *c; | |
5260325f | 1805 | |
7368a6c8 | 1806 | id = packet_get_int(); |
95500969 | 1807 | packet_check_eom(); |
7368a6c8 | 1808 | c = channel_lookup(id); |
1809 | if (c == NULL) | |
1810 | packet_disconnect("Received close for nonexistent channel %d.", id); | |
aa3378df | 1811 | |
1812 | /* | |
1813 | * Send a confirmation that we have closed the channel and no more | |
1814 | * data is coming for it. | |
1815 | */ | |
5260325f | 1816 | packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION); |
7368a6c8 | 1817 | packet_put_int(c->remote_id); |
5260325f | 1818 | packet_send(); |
1819 | ||
aa3378df | 1820 | /* |
1821 | * If the channel is in closed state, we have sent a close request, | |
1822 | * and the other side will eventually respond with a confirmation. | |
1823 | * Thus, we cannot free the channel here, because then there would be | |
1824 | * no-one to receive the confirmation. The channel gets freed when | |
1825 | * the confirmation arrives. | |
1826 | */ | |
7368a6c8 | 1827 | if (c->type != SSH_CHANNEL_CLOSED) { |
aa3378df | 1828 | /* |
1829 | * Not a closed channel - mark it as draining, which will | |
1830 | * cause it to be freed later. | |
1831 | */ | |
9c50edcf | 1832 | buffer_clear(&c->input); |
7368a6c8 | 1833 | c->type = SSH_CHANNEL_OUTPUT_DRAINING; |
5260325f | 1834 | } |
8efc0c15 | 1835 | } |
1836 | ||
7368a6c8 | 1837 | /* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */ |
6ae2364d | 1838 | void |
7819b5c3 | 1839 | channel_input_oclose(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 1840 | { |
7368a6c8 | 1841 | int id = packet_get_int(); |
1842 | Channel *c = channel_lookup(id); | |
a8a21a53 | 1843 | |
95500969 | 1844 | packet_check_eom(); |
7368a6c8 | 1845 | if (c == NULL) |
1846 | packet_disconnect("Received oclose for nonexistent channel %d.", id); | |
1847 | chan_rcvd_oclose(c); | |
8efc0c15 | 1848 | } |
1849 | ||
6ae2364d | 1850 | void |
7819b5c3 | 1851 | channel_input_close_confirmation(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 1852 | { |
1853 | int id = packet_get_int(); | |
1854 | Channel *c = channel_lookup(id); | |
1855 | ||
95500969 | 1856 | packet_check_eom(); |
7368a6c8 | 1857 | if (c == NULL) |
1858 | packet_disconnect("Received close confirmation for " | |
1859 | "out-of-range channel %d.", id); | |
1860 | if (c->type != SSH_CHANNEL_CLOSED) | |
1861 | packet_disconnect("Received close confirmation for " | |
1862 | "non-closed channel %d (type %d).", id, c->type); | |
719fc62f | 1863 | channel_free(c); |
7368a6c8 | 1864 | } |
8efc0c15 | 1865 | |
6ae2364d | 1866 | void |
7819b5c3 | 1867 | channel_input_open_confirmation(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 1868 | { |
7368a6c8 | 1869 | int id, remote_id; |
1870 | Channel *c; | |
5260325f | 1871 | |
7368a6c8 | 1872 | id = packet_get_int(); |
1873 | c = channel_lookup(id); | |
5260325f | 1874 | |
7368a6c8 | 1875 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) |
1876 | packet_disconnect("Received open confirmation for " | |
1877 | "non-opening channel %d.", id); | |
1878 | remote_id = packet_get_int(); | |
aa3378df | 1879 | /* Record the remote channel number and mark that the channel is now open. */ |
7368a6c8 | 1880 | c->remote_id = remote_id; |
1881 | c->type = SSH_CHANNEL_OPEN; | |
7e7327a1 | 1882 | |
1883 | if (compat20) { | |
1884 | c->remote_window = packet_get_int(); | |
1885 | c->remote_maxpacket = packet_get_int(); | |
05ca0898 | 1886 | if (c->confirm) { |
de273eef | 1887 | debug2("callback start"); |
05ca0898 | 1888 | c->confirm(c->self, NULL); |
de273eef | 1889 | debug2("callback done"); |
7e7327a1 | 1890 | } |
f91d9a89 | 1891 | debug("channel %d: open confirm rwindow %u rmax %u", c->self, |
7e7327a1 | 1892 | c->remote_window, c->remote_maxpacket); |
1893 | } | |
95500969 | 1894 | packet_check_eom(); |
8efc0c15 | 1895 | } |
1896 | ||
396c147e | 1897 | static char * |
d18e0850 | 1898 | reason2txt(int reason) |
1899 | { | |
6aacefa7 | 1900 | switch (reason) { |
d18e0850 | 1901 | case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED: |
1902 | return "administratively prohibited"; | |
1903 | case SSH2_OPEN_CONNECT_FAILED: | |
1904 | return "connect failed"; | |
1905 | case SSH2_OPEN_UNKNOWN_CHANNEL_TYPE: | |
1906 | return "unknown channel type"; | |
1907 | case SSH2_OPEN_RESOURCE_SHORTAGE: | |
1908 | return "resource shortage"; | |
1909 | } | |
7e8c18e9 | 1910 | return "unknown reason"; |
d18e0850 | 1911 | } |
1912 | ||
6ae2364d | 1913 | void |
7819b5c3 | 1914 | channel_input_open_failure(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 1915 | { |
02a024dd | 1916 | int id, reason; |
1917 | char *msg = NULL, *lang = NULL; | |
7368a6c8 | 1918 | Channel *c; |
5260325f | 1919 | |
7368a6c8 | 1920 | id = packet_get_int(); |
1921 | c = channel_lookup(id); | |
1922 | ||
1923 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) | |
1924 | packet_disconnect("Received open failure for " | |
1925 | "non-opening channel %d.", id); | |
7e7327a1 | 1926 | if (compat20) { |
02a024dd | 1927 | reason = packet_get_int(); |
fbe90f7b | 1928 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { |
02a024dd | 1929 | msg = packet_get_string(NULL); |
1930 | lang = packet_get_string(NULL); | |
1931 | } | |
bbe88b6d | 1932 | logit("channel %d: open failed: %s%s%s", id, |
d18e0850 | 1933 | reason2txt(reason), msg ? ": ": "", msg ? msg : ""); |
02a024dd | 1934 | if (msg != NULL) |
1935 | xfree(msg); | |
1936 | if (lang != NULL) | |
1937 | xfree(lang); | |
7e7327a1 | 1938 | } |
95500969 | 1939 | packet_check_eom(); |
5260325f | 1940 | /* Free the channel. This will also close the socket. */ |
719fc62f | 1941 | channel_free(c); |
8efc0c15 | 1942 | } |
1943 | ||
8e7895b8 | 1944 | void |
7819b5c3 | 1945 | channel_input_window_adjust(int type, u_int32_t seq, void *ctxt) |
8e7895b8 | 1946 | { |
1947 | Channel *c; | |
f91d9a89 | 1948 | int id; |
1949 | u_int adjust; | |
3ffc6336 | 1950 | |
8e7895b8 | 1951 | if (!compat20) |
1952 | return; | |
8efc0c15 | 1953 | |
8e7895b8 | 1954 | /* Get the channel number and verify it. */ |
1955 | id = packet_get_int(); | |
1956 | c = channel_lookup(id); | |
1957 | ||
1958 | if (c == NULL || c->type != SSH_CHANNEL_OPEN) { | |
bbe88b6d | 1959 | logit("Received window adjust for " |
8e7895b8 | 1960 | "non-open channel %d.", id); |
1961 | return; | |
1962 | } | |
1963 | adjust = packet_get_int(); | |
95500969 | 1964 | packet_check_eom(); |
f91d9a89 | 1965 | debug2("channel %d: rcvd adjust %u", id, adjust); |
8e7895b8 | 1966 | c->remote_window += adjust; |
1967 | } | |
1968 | ||
1969 | void | |
7819b5c3 | 1970 | channel_input_port_open(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 1971 | { |
8e7895b8 | 1972 | Channel *c = NULL; |
1973 | u_short host_port; | |
1974 | char *host, *originator_string; | |
1975 | int remote_id, sock = -1; | |
5260325f | 1976 | |
8e7895b8 | 1977 | remote_id = packet_get_int(); |
1978 | host = packet_get_string(NULL); | |
1979 | host_port = packet_get_int(); | |
1980 | ||
1981 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) { | |
1982 | originator_string = packet_get_string(NULL); | |
1983 | } else { | |
1984 | originator_string = xstrdup("unknown (remote did not supply name)"); | |
1985 | } | |
95500969 | 1986 | packet_check_eom(); |
8e7895b8 | 1987 | sock = channel_connect_to(host, host_port); |
1988 | if (sock != -1) { | |
1989 | c = channel_new("connected socket", | |
1990 | SSH_CHANNEL_CONNECTING, sock, sock, -1, 0, 0, 0, | |
1991 | originator_string, 1); | |
3a0d3d54 | 1992 | c->remote_id = remote_id; |
5260325f | 1993 | } |
0d942eff | 1994 | xfree(originator_string); |
8e7895b8 | 1995 | if (c == NULL) { |
1996 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
1997 | packet_put_int(remote_id); | |
1998 | packet_send(); | |
1999 | } | |
2000 | xfree(host); | |
8efc0c15 | 2001 | } |
2002 | ||
8e7895b8 | 2003 | |
2004 | /* -- tcp forwarding */ | |
2005 | ||
5e4a7219 | 2006 | void |
2007 | channel_set_af(int af) | |
2008 | { | |
2009 | IPv4or6 = af; | |
2010 | } | |
2011 | ||
5641aefa | 2012 | static int |
2013 | channel_setup_fwd_listener(int type, const char *listen_addr, u_short listen_port, | |
2014 | const char *host_to_connect, u_short port_to_connect, int gateway_ports) | |
8efc0c15 | 2015 | { |
719fc62f | 2016 | Channel *c; |
5641aefa | 2017 | int success, sock, on = 1; |
48e671d5 | 2018 | struct addrinfo hints, *ai, *aitop; |
fa08c86b | 2019 | const char *host; |
5641aefa | 2020 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
5260325f | 2021 | |
02a024dd | 2022 | success = 0; |
5641aefa | 2023 | host = (type == SSH_CHANNEL_RPORT_LISTENER) ? |
2024 | listen_addr : host_to_connect; | |
02a024dd | 2025 | |
5641aefa | 2026 | if (host == NULL) { |
2027 | error("No forward host name."); | |
2028 | return success; | |
fa08c86b | 2029 | } |
719fc62f | 2030 | if (strlen(host) > SSH_CHANNEL_PATH_LEN - 1) { |
02a024dd | 2031 | error("Forward host name too long."); |
2032 | return success; | |
2033 | } | |
5260325f | 2034 | |
aa3378df | 2035 | /* |
48e671d5 | 2036 | * getaddrinfo returns a loopback address if the hostname is |
2037 | * set to NULL and hints.ai_flags is not AI_PASSIVE | |
aa3378df | 2038 | */ |
48e671d5 | 2039 | memset(&hints, 0, sizeof(hints)); |
2040 | hints.ai_family = IPv4or6; | |
2041 | hints.ai_flags = gateway_ports ? AI_PASSIVE : 0; | |
2042 | hints.ai_socktype = SOCK_STREAM; | |
fa08c86b | 2043 | snprintf(strport, sizeof strport, "%d", listen_port); |
48e671d5 | 2044 | if (getaddrinfo(NULL, strport, &hints, &aitop) != 0) |
2045 | packet_disconnect("getaddrinfo: fatal error"); | |
2046 | ||
48e671d5 | 2047 | for (ai = aitop; ai; ai = ai->ai_next) { |
2048 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
2049 | continue; | |
2050 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), | |
2051 | strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { | |
5641aefa | 2052 | error("channel_setup_fwd_listener: getnameinfo failed"); |
48e671d5 | 2053 | continue; |
2054 | } | |
2055 | /* Create a port to listen for the host. */ | |
3e131a6d | 2056 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
48e671d5 | 2057 | if (sock < 0) { |
2058 | /* this is no error since kernel may not support ipv6 */ | |
2059 | verbose("socket: %.100s", strerror(errno)); | |
2060 | continue; | |
2061 | } | |
2062 | /* | |
facfd613 | 2063 | * Set socket options. |
2064 | * Allow local port reuse in TIME_WAIT. | |
48e671d5 | 2065 | */ |
facfd613 | 2066 | if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &on, |
2067 | sizeof(on)) == -1) | |
2068 | error("setsockopt SO_REUSEADDR: %s", strerror(errno)); | |
2069 | ||
48e671d5 | 2070 | debug("Local forwarding listening on %s port %s.", ntop, strport); |
2071 | ||
2072 | /* Bind the socket to the address. */ | |
2073 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { | |
2074 | /* address can be in use ipv6 address is already bound */ | |
16218745 | 2075 | if (!ai->ai_next) |
2076 | error("bind: %.100s", strerror(errno)); | |
2077 | else | |
2078 | verbose("bind: %.100s", strerror(errno)); | |
2b87da3b | 2079 | |
48e671d5 | 2080 | close(sock); |
2081 | continue; | |
2082 | } | |
2083 | /* Start listening for connections on the socket. */ | |
2084 | if (listen(sock, 5) < 0) { | |
2085 | error("listen: %.100s", strerror(errno)); | |
2086 | close(sock); | |
2087 | continue; | |
2088 | } | |
2089 | /* Allocate a channel number for the socket. */ | |
8e7895b8 | 2090 | c = channel_new("port listener", type, sock, sock, -1, |
0b242b12 | 2091 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, |
0d942eff | 2092 | 0, "port listener", 1); |
719fc62f | 2093 | strlcpy(c->path, host, sizeof(c->path)); |
2094 | c->host_port = port_to_connect; | |
2095 | c->listening_port = listen_port; | |
48e671d5 | 2096 | success = 1; |
2097 | } | |
2098 | if (success == 0) | |
5641aefa | 2099 | error("channel_setup_fwd_listener: cannot listen to port: %d", |
02a024dd | 2100 | listen_port); |
48e671d5 | 2101 | freeaddrinfo(aitop); |
02a024dd | 2102 | return success; |
5260325f | 2103 | } |
8efc0c15 | 2104 | |
5641aefa | 2105 | /* protocol local port fwd, used by ssh (and sshd in v1) */ |
2106 | int | |
2107 | channel_setup_local_fwd_listener(u_short listen_port, | |
2108 | const char *host_to_connect, u_short port_to_connect, int gateway_ports) | |
2109 | { | |
2110 | return channel_setup_fwd_listener(SSH_CHANNEL_PORT_LISTENER, | |
2111 | NULL, listen_port, host_to_connect, port_to_connect, gateway_ports); | |
2112 | } | |
2113 | ||
2114 | /* protocol v2 remote port fwd, used by sshd */ | |
2115 | int | |
2116 | channel_setup_remote_fwd_listener(const char *listen_address, | |
2117 | u_short listen_port, int gateway_ports) | |
2118 | { | |
2119 | return channel_setup_fwd_listener(SSH_CHANNEL_RPORT_LISTENER, | |
2120 | listen_address, listen_port, NULL, 0, gateway_ports); | |
2121 | } | |
2122 | ||
aa3378df | 2123 | /* |
2124 | * Initiate forwarding of connections to port "port" on remote host through | |
2125 | * the secure channel to host:port from local side. | |
2126 | */ | |
8efc0c15 | 2127 | |
6ae2364d | 2128 | void |
fa08c86b | 2129 | channel_request_remote_forwarding(u_short listen_port, |
2130 | const char *host_to_connect, u_short port_to_connect) | |
8efc0c15 | 2131 | { |
54a5250f | 2132 | int type, success = 0; |
fa08c86b | 2133 | |
5260325f | 2134 | /* Record locally that connection to this host/port is permitted. */ |
2135 | if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
2136 | fatal("channel_request_remote_forwarding: too many forwards"); | |
2137 | ||
5260325f | 2138 | /* Send the forward request to the remote side. */ |
7e7327a1 | 2139 | if (compat20) { |
2140 | const char *address_to_bind = "0.0.0.0"; | |
2141 | packet_start(SSH2_MSG_GLOBAL_REQUEST); | |
2142 | packet_put_cstring("tcpip-forward"); | |
e0ae8728 | 2143 | packet_put_char(1); /* boolean: want reply */ |
7e7327a1 | 2144 | packet_put_cstring(address_to_bind); |
2145 | packet_put_int(listen_port); | |
fa08c86b | 2146 | packet_send(); |
2147 | packet_write_wait(); | |
2148 | /* Assume that server accepts the request */ | |
2149 | success = 1; | |
7e7327a1 | 2150 | } else { |
2151 | packet_start(SSH_CMSG_PORT_FORWARD_REQUEST); | |
7e7327a1 | 2152 | packet_put_int(listen_port); |
d6f24e45 | 2153 | packet_put_cstring(host_to_connect); |
2154 | packet_put_int(port_to_connect); | |
7e7327a1 | 2155 | packet_send(); |
2156 | packet_write_wait(); | |
fa08c86b | 2157 | |
2158 | /* Wait for response from the remote side. */ | |
54a5250f | 2159 | type = packet_read(); |
fa08c86b | 2160 | switch (type) { |
2161 | case SSH_SMSG_SUCCESS: | |
2162 | success = 1; | |
2163 | break; | |
2164 | case SSH_SMSG_FAILURE: | |
bbe88b6d | 2165 | logit("Warning: Server denied remote port forwarding."); |
fa08c86b | 2166 | break; |
2167 | default: | |
2168 | /* Unknown packet */ | |
2169 | packet_disconnect("Protocol error for port forward request:" | |
2170 | "received packet type %d.", type); | |
2171 | } | |
2172 | } | |
2173 | if (success) { | |
2174 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host_to_connect); | |
2175 | permitted_opens[num_permitted_opens].port_to_connect = port_to_connect; | |
2176 | permitted_opens[num_permitted_opens].listen_port = listen_port; | |
2177 | num_permitted_opens++; | |
7e7327a1 | 2178 | } |
8efc0c15 | 2179 | } |
2180 | ||
aa3378df | 2181 | /* |
2182 | * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates | |
2183 | * listening for the port, and sends back a success reply (or disconnect | |
2184 | * message if there was an error). This never returns if there was an error. | |
2185 | */ | |
8efc0c15 | 2186 | |
6ae2364d | 2187 | void |
1d1ffb87 | 2188 | channel_input_port_forward_request(int is_root, int gateway_ports) |
8efc0c15 | 2189 | { |
57112b5a | 2190 | u_short port, host_port; |
5260325f | 2191 | char *hostname; |
2192 | ||
2193 | /* Get arguments from the packet. */ | |
2194 | port = packet_get_int(); | |
2195 | hostname = packet_get_string(NULL); | |
2196 | host_port = packet_get_int(); | |
2197 | ||
3c62e7eb | 2198 | #ifndef HAVE_CYGWIN |
aa3378df | 2199 | /* |
2200 | * Check that an unprivileged user is not trying to forward a | |
2201 | * privileged port. | |
2202 | */ | |
5260325f | 2203 | if (port < IPPORT_RESERVED && !is_root) |
2204 | packet_disconnect("Requested forwarding of port %d but user is not root.", | |
2205 | port); | |
3c62e7eb | 2206 | #endif |
fa08c86b | 2207 | /* Initiate forwarding */ |
5641aefa | 2208 | channel_setup_local_fwd_listener(port, hostname, host_port, gateway_ports); |
5260325f | 2209 | |
2210 | /* Free the argument string. */ | |
2211 | xfree(hostname); | |
8efc0c15 | 2212 | } |
2213 | ||
01794848 | 2214 | /* |
2215 | * Permits opening to any host/port if permitted_opens[] is empty. This is | |
2216 | * usually called by the server, because the user could connect to any port | |
2217 | * anyway, and the server has no way to know but to trust the client anyway. | |
2218 | */ | |
2219 | void | |
d5bb9418 | 2220 | channel_permit_all_opens(void) |
01794848 | 2221 | { |
2222 | if (num_permitted_opens == 0) | |
2223 | all_opens_permitted = 1; | |
2224 | } | |
2225 | ||
cd332296 | 2226 | void |
01794848 | 2227 | channel_add_permitted_opens(char *host, int port) |
2228 | { | |
2229 | if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
2230 | fatal("channel_request_remote_forwarding: too many forwards"); | |
2231 | debug("allow port forwarding to host %s port %d", host, port); | |
2232 | ||
2233 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host); | |
2234 | permitted_opens[num_permitted_opens].port_to_connect = port; | |
2235 | num_permitted_opens++; | |
2236 | ||
2237 | all_opens_permitted = 0; | |
2238 | } | |
2239 | ||
cd332296 | 2240 | void |
01794848 | 2241 | channel_clear_permitted_opens(void) |
2242 | { | |
2243 | int i; | |
2244 | ||
2245 | for (i = 0; i < num_permitted_opens; i++) | |
2246 | xfree(permitted_opens[i].host_to_connect); | |
2247 | num_permitted_opens = 0; | |
2248 | ||
2249 | } | |
2250 | ||
2251 | ||
2252 | /* return socket to remote host, port */ | |
396c147e | 2253 | static int |
01794848 | 2254 | connect_to(const char *host, u_short port) |
8efc0c15 | 2255 | { |
48e671d5 | 2256 | struct addrinfo hints, *ai, *aitop; |
2257 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; | |
2258 | int gaierr; | |
7368a6c8 | 2259 | int sock = -1; |
48e671d5 | 2260 | |
2261 | memset(&hints, 0, sizeof(hints)); | |
2262 | hints.ai_family = IPv4or6; | |
2263 | hints.ai_socktype = SOCK_STREAM; | |
01794848 | 2264 | snprintf(strport, sizeof strport, "%d", port); |
48e671d5 | 2265 | if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) { |
01794848 | 2266 | error("connect_to %.100s: unknown host (%s)", host, |
2267 | gai_strerror(gaierr)); | |
7368a6c8 | 2268 | return -1; |
48e671d5 | 2269 | } |
48e671d5 | 2270 | for (ai = aitop; ai; ai = ai->ai_next) { |
2271 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
2272 | continue; | |
2273 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), | |
2274 | strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { | |
01794848 | 2275 | error("connect_to: getnameinfo failed"); |
48e671d5 | 2276 | continue; |
5260325f | 2277 | } |
3e131a6d | 2278 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
48e671d5 | 2279 | if (sock < 0) { |
4940c411 | 2280 | if (ai->ai_next == NULL) |
2281 | error("socket: %.100s", strerror(errno)); | |
2282 | else | |
2283 | verbose("socket: %.100s", strerror(errno)); | |
48e671d5 | 2284 | continue; |
5260325f | 2285 | } |
eea39c02 | 2286 | if (fcntl(sock, F_SETFL, O_NONBLOCK) < 0) |
97fb6912 | 2287 | fatal("connect_to: F_SETFL: %s", strerror(errno)); |
97fb6912 | 2288 | if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0 && |
2289 | errno != EINPROGRESS) { | |
01794848 | 2290 | error("connect_to %.100s port %s: %.100s", ntop, strport, |
48e671d5 | 2291 | strerror(errno)); |
2292 | close(sock); | |
2b87da3b | 2293 | continue; /* fail -- try next */ |
48e671d5 | 2294 | } |
2295 | break; /* success */ | |
5260325f | 2296 | |
5260325f | 2297 | } |
48e671d5 | 2298 | freeaddrinfo(aitop); |
48e671d5 | 2299 | if (!ai) { |
01794848 | 2300 | error("connect_to %.100s port %d: failed.", host, port); |
7368a6c8 | 2301 | return -1; |
8efc0c15 | 2302 | } |
7368a6c8 | 2303 | /* success */ |
811a6342 | 2304 | set_nodelay(sock); |
7368a6c8 | 2305 | return sock; |
2306 | } | |
01794848 | 2307 | |
fa08c86b | 2308 | int |
b3f8a79c | 2309 | channel_connect_by_listen_address(u_short listen_port) |
fa08c86b | 2310 | { |
2311 | int i; | |
01794848 | 2312 | |
fa08c86b | 2313 | for (i = 0; i < num_permitted_opens; i++) |
2314 | if (permitted_opens[i].listen_port == listen_port) | |
01794848 | 2315 | return connect_to( |
fa08c86b | 2316 | permitted_opens[i].host_to_connect, |
2317 | permitted_opens[i].port_to_connect); | |
0b6fbf03 | 2318 | error("WARNING: Server requests forwarding for unknown listen_port %d", |
2319 | listen_port); | |
fa08c86b | 2320 | return -1; |
2321 | } | |
48e671d5 | 2322 | |
01794848 | 2323 | /* Check if connecting to that port is permitted and connect. */ |
2324 | int | |
2325 | channel_connect_to(const char *host, u_short port) | |
2326 | { | |
2327 | int i, permit; | |
2328 | ||
2329 | permit = all_opens_permitted; | |
2330 | if (!permit) { | |
2331 | for (i = 0; i < num_permitted_opens; i++) | |
2332 | if (permitted_opens[i].port_to_connect == port && | |
2333 | strcmp(permitted_opens[i].host_to_connect, host) == 0) | |
2334 | permit = 1; | |
2335 | ||
2336 | } | |
2337 | if (!permit) { | |
bbe88b6d | 2338 | logit("Received request to connect to host %.100s port %d, " |
01794848 | 2339 | "but the request was denied.", host, port); |
2340 | return -1; | |
2341 | } | |
2342 | return connect_to(host, port); | |
2343 | } | |
2344 | ||
8e7895b8 | 2345 | /* -- X11 forwarding */ |
8efc0c15 | 2346 | |
aa3378df | 2347 | /* |
2348 | * Creates an internet domain socket for listening for X11 connections. | |
57f228e8 | 2349 | * Returns 0 and a suitable display number for the DISPLAY variable |
2350 | * stored in display_numberp , or -1 if an error occurs. | |
aa3378df | 2351 | */ |
c9d0ad9b | 2352 | int |
e6e573bd | 2353 | x11_create_display_inet(int x11_display_offset, int x11_use_localhost, |
57f228e8 | 2354 | int single_connection, u_int *display_numberp) |
8efc0c15 | 2355 | { |
ac151b18 | 2356 | Channel *nc = NULL; |
57112b5a | 2357 | int display_number, sock; |
2358 | u_short port; | |
48e671d5 | 2359 | struct addrinfo hints, *ai, *aitop; |
2360 | char strport[NI_MAXSERV]; | |
2361 | int gaierr, n, num_socks = 0, socks[NUM_SOCKS]; | |
5260325f | 2362 | |
95f1eccc | 2363 | for (display_number = x11_display_offset; |
184eed6a | 2364 | display_number < MAX_DISPLAYS; |
2365 | display_number++) { | |
5260325f | 2366 | port = 6000 + display_number; |
48e671d5 | 2367 | memset(&hints, 0, sizeof(hints)); |
2368 | hints.ai_family = IPv4or6; | |
e6e573bd | 2369 | hints.ai_flags = x11_use_localhost ? 0: AI_PASSIVE; |
48e671d5 | 2370 | hints.ai_socktype = SOCK_STREAM; |
2371 | snprintf(strport, sizeof strport, "%d", port); | |
2372 | if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) { | |
2373 | error("getaddrinfo: %.100s", gai_strerror(gaierr)); | |
c9d0ad9b | 2374 | return -1; |
5260325f | 2375 | } |
48e671d5 | 2376 | for (ai = aitop; ai; ai = ai->ai_next) { |
2377 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
2378 | continue; | |
3e131a6d | 2379 | sock = socket(ai->ai_family, ai->ai_socktype, |
2380 | ai->ai_protocol); | |
48e671d5 | 2381 | if (sock < 0) { |
4ee81249 | 2382 | if ((errno != EINVAL) && (errno != EAFNOSUPPORT)) { |
80a44451 | 2383 | error("socket: %.100s", strerror(errno)); |
c9d0ad9b | 2384 | return -1; |
80a44451 | 2385 | } else { |
22d89d24 | 2386 | debug("x11_create_display_inet: Socket family %d not supported", |
2387 | ai->ai_family); | |
80a44451 | 2388 | continue; |
2389 | } | |
48e671d5 | 2390 | } |
688aaeda | 2391 | #ifdef IPV6_V6ONLY |
2392 | if (ai->ai_family == AF_INET6) { | |
2393 | int on = 1; | |
2394 | if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) < 0) | |
2395 | error("setsockopt IPV6_V6ONLY: %.100s", strerror(errno)); | |
2396 | } | |
2397 | #endif | |
48e671d5 | 2398 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { |
2399 | debug("bind port %d: %.100s", port, strerror(errno)); | |
48e671d5 | 2400 | close(sock); |
16218745 | 2401 | |
2402 | if (ai->ai_next) | |
2403 | continue; | |
2404 | ||
48e671d5 | 2405 | for (n = 0; n < num_socks; n++) { |
48e671d5 | 2406 | close(socks[n]); |
2407 | } | |
2408 | num_socks = 0; | |
2409 | break; | |
2410 | } | |
2411 | socks[num_socks++] = sock; | |
80faa19f | 2412 | #ifndef DONT_TRY_OTHER_AF |
48e671d5 | 2413 | if (num_socks == NUM_SOCKS) |
2414 | break; | |
80faa19f | 2415 | #else |
688aaeda | 2416 | if (x11_use_localhost) { |
2417 | if (num_socks == NUM_SOCKS) | |
2418 | break; | |
2419 | } else { | |
2420 | break; | |
2421 | } | |
80faa19f | 2422 | #endif |
5260325f | 2423 | } |
4ccb01d6 | 2424 | freeaddrinfo(aitop); |
48e671d5 | 2425 | if (num_socks > 0) |
2426 | break; | |
5260325f | 2427 | } |
2428 | if (display_number >= MAX_DISPLAYS) { | |
2429 | error("Failed to allocate internet-domain X11 display socket."); | |
c9d0ad9b | 2430 | return -1; |
8efc0c15 | 2431 | } |
5260325f | 2432 | /* Start listening for connections on the socket. */ |
48e671d5 | 2433 | for (n = 0; n < num_socks; n++) { |
2434 | sock = socks[n]; | |
2435 | if (listen(sock, 5) < 0) { | |
2436 | error("listen: %.100s", strerror(errno)); | |
48e671d5 | 2437 | close(sock); |
c9d0ad9b | 2438 | return -1; |
a7effaac | 2439 | } |
a7effaac | 2440 | } |
5260325f | 2441 | |
48e671d5 | 2442 | /* Allocate a channel for each socket. */ |
2443 | for (n = 0; n < num_socks; n++) { | |
2444 | sock = socks[n]; | |
ac151b18 | 2445 | nc = channel_new("x11 listener", |
0b242b12 | 2446 | SSH_CHANNEL_X11_LISTENER, sock, sock, -1, |
2447 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, | |
0d942eff | 2448 | 0, "X11 inet listener", 1); |
3a0d3d54 | 2449 | nc->single_connection = single_connection; |
48e671d5 | 2450 | } |
5260325f | 2451 | |
c9d0ad9b | 2452 | /* Return the display number for the DISPLAY environment variable. */ |
57f228e8 | 2453 | *display_numberp = display_number; |
2454 | return (0); | |
8efc0c15 | 2455 | } |
2456 | ||
396c147e | 2457 | static int |
1e3b8b07 | 2458 | connect_local_xsocket(u_int dnr) |
8efc0c15 | 2459 | { |
5260325f | 2460 | int sock; |
2461 | struct sockaddr_un addr; | |
5260325f | 2462 | |
805e659f | 2463 | sock = socket(AF_UNIX, SOCK_STREAM, 0); |
2464 | if (sock < 0) | |
2465 | error("socket: %.100s", strerror(errno)); | |
2466 | memset(&addr, 0, sizeof(addr)); | |
2467 | addr.sun_family = AF_UNIX; | |
2468 | snprintf(addr.sun_path, sizeof addr.sun_path, _PATH_UNIX_X, dnr); | |
2469 | if (connect(sock, (struct sockaddr *) & addr, sizeof(addr)) == 0) | |
2470 | return sock; | |
2471 | close(sock); | |
5260325f | 2472 | error("connect %.100s: %.100s", addr.sun_path, strerror(errno)); |
2473 | return -1; | |
8efc0c15 | 2474 | } |
2475 | ||
0b242b12 | 2476 | int |
2477 | x11_connect_display(void) | |
8efc0c15 | 2478 | { |
bcc0381e | 2479 | int display_number, sock = 0; |
5260325f | 2480 | const char *display; |
0b242b12 | 2481 | char buf[1024], *cp; |
48e671d5 | 2482 | struct addrinfo hints, *ai, *aitop; |
2483 | char strport[NI_MAXSERV]; | |
2484 | int gaierr; | |
5260325f | 2485 | |
5260325f | 2486 | /* Try to open a socket for the local X server. */ |
2487 | display = getenv("DISPLAY"); | |
2488 | if (!display) { | |
2489 | error("DISPLAY not set."); | |
0b242b12 | 2490 | return -1; |
5260325f | 2491 | } |
aa3378df | 2492 | /* |
2493 | * Now we decode the value of the DISPLAY variable and make a | |
2494 | * connection to the real X server. | |
2495 | */ | |
2496 | ||
2497 | /* | |
2498 | * Check if it is a unix domain socket. Unix domain displays are in | |
2499 | * one of the following formats: unix:d[.s], :d[.s], ::d[.s] | |
2500 | */ | |
5260325f | 2501 | if (strncmp(display, "unix:", 5) == 0 || |
2502 | display[0] == ':') { | |
2503 | /* Connect to the unix domain socket. */ | |
2504 | if (sscanf(strrchr(display, ':') + 1, "%d", &display_number) != 1) { | |
2505 | error("Could not parse display number from DISPLAY: %.100s", | |
184eed6a | 2506 | display); |
0b242b12 | 2507 | return -1; |
5260325f | 2508 | } |
2509 | /* Create a socket. */ | |
2510 | sock = connect_local_xsocket(display_number); | |
2511 | if (sock < 0) | |
0b242b12 | 2512 | return -1; |
5260325f | 2513 | |
2514 | /* OK, we now have a connection to the display. */ | |
0b242b12 | 2515 | return sock; |
5260325f | 2516 | } |
aa3378df | 2517 | /* |
2518 | * Connect to an inet socket. The DISPLAY value is supposedly | |
2519 | * hostname:d[.s], where hostname may also be numeric IP address. | |
2520 | */ | |
74860245 | 2521 | strlcpy(buf, display, sizeof(buf)); |
5260325f | 2522 | cp = strchr(buf, ':'); |
2523 | if (!cp) { | |
2524 | error("Could not find ':' in DISPLAY: %.100s", display); | |
0b242b12 | 2525 | return -1; |
5260325f | 2526 | } |
2527 | *cp = 0; | |
aa3378df | 2528 | /* buf now contains the host name. But first we parse the display number. */ |
5260325f | 2529 | if (sscanf(cp + 1, "%d", &display_number) != 1) { |
2530 | error("Could not parse display number from DISPLAY: %.100s", | |
184eed6a | 2531 | display); |
0b242b12 | 2532 | return -1; |
5260325f | 2533 | } |
5260325f | 2534 | |
48e671d5 | 2535 | /* Look up the host address */ |
2536 | memset(&hints, 0, sizeof(hints)); | |
2537 | hints.ai_family = IPv4or6; | |
2538 | hints.ai_socktype = SOCK_STREAM; | |
2539 | snprintf(strport, sizeof strport, "%d", 6000 + display_number); | |
2540 | if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) { | |
2541 | error("%.100s: unknown host. (%s)", buf, gai_strerror(gaierr)); | |
0b242b12 | 2542 | return -1; |
8efc0c15 | 2543 | } |
48e671d5 | 2544 | for (ai = aitop; ai; ai = ai->ai_next) { |
2545 | /* Create a socket. */ | |
3e131a6d | 2546 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
48e671d5 | 2547 | if (sock < 0) { |
2548 | debug("socket: %.100s", strerror(errno)); | |
7368a6c8 | 2549 | continue; |
2550 | } | |
2551 | /* Connect it to the display. */ | |
2552 | if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) { | |
2553 | debug("connect %.100s port %d: %.100s", buf, | |
2554 | 6000 + display_number, strerror(errno)); | |
2555 | close(sock); | |
2556 | continue; | |
2557 | } | |
2558 | /* Success */ | |
2559 | break; | |
48e671d5 | 2560 | } |
48e671d5 | 2561 | freeaddrinfo(aitop); |
2562 | if (!ai) { | |
6ae2364d | 2563 | error("connect %.100s port %d: %.100s", buf, 6000 + display_number, |
48e671d5 | 2564 | strerror(errno)); |
0b242b12 | 2565 | return -1; |
8efc0c15 | 2566 | } |
bcc0381e | 2567 | set_nodelay(sock); |
0b242b12 | 2568 | return sock; |
2569 | } | |
5260325f | 2570 | |
0b242b12 | 2571 | /* |
2572 | * This is called when SSH_SMSG_X11_OPEN is received. The packet contains | |
2573 | * the remote channel number. We should do whatever we want, and respond | |
2574 | * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE. | |
2575 | */ | |
5260325f | 2576 | |
0b242b12 | 2577 | void |
7819b5c3 | 2578 | x11_input_open(int type, u_int32_t seq, void *ctxt) |
0b242b12 | 2579 | { |
719fc62f | 2580 | Channel *c = NULL; |
2581 | int remote_id, sock = 0; | |
0b242b12 | 2582 | char *remote_host; |
5260325f | 2583 | |
719fc62f | 2584 | debug("Received X11 open request."); |
5260325f | 2585 | |
719fc62f | 2586 | remote_id = packet_get_int(); |
8e7895b8 | 2587 | |
2588 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) { | |
719fc62f | 2589 | remote_host = packet_get_string(NULL); |
0b242b12 | 2590 | } else { |
2591 | remote_host = xstrdup("unknown (remote did not supply name)"); | |
0b242b12 | 2592 | } |
95500969 | 2593 | packet_check_eom(); |
0b242b12 | 2594 | |
2595 | /* Obtain a connection to the real X display. */ | |
2596 | sock = x11_connect_display(); | |
719fc62f | 2597 | if (sock != -1) { |
2598 | /* Allocate a channel for this connection. */ | |
2599 | c = channel_new("connected x11 socket", | |
2600 | SSH_CHANNEL_X11_OPEN, sock, sock, -1, 0, 0, 0, | |
2601 | remote_host, 1); | |
3a0d3d54 | 2602 | c->remote_id = remote_id; |
2603 | c->force_drain = 1; | |
719fc62f | 2604 | } |
0d942eff | 2605 | xfree(remote_host); |
719fc62f | 2606 | if (c == NULL) { |
0b242b12 | 2607 | /* Send refusal to the remote host. */ |
2608 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
719fc62f | 2609 | packet_put_int(remote_id); |
0b242b12 | 2610 | } else { |
0b242b12 | 2611 | /* Send a confirmation to the remote host. */ |
2612 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
719fc62f | 2613 | packet_put_int(remote_id); |
2614 | packet_put_int(c->self); | |
0b242b12 | 2615 | } |
719fc62f | 2616 | packet_send(); |
8efc0c15 | 2617 | } |
2618 | ||
a22aff1f | 2619 | /* dummy protocol handler that denies SSH-1 requests (agent/x11) */ |
2620 | void | |
7819b5c3 | 2621 | deny_input_open(int type, u_int32_t seq, void *ctxt) |
a22aff1f | 2622 | { |
2623 | int rchan = packet_get_int(); | |
e1feb9bf | 2624 | |
6aacefa7 | 2625 | switch (type) { |
a22aff1f | 2626 | case SSH_SMSG_AGENT_OPEN: |
2627 | error("Warning: ssh server tried agent forwarding."); | |
2628 | break; | |
2629 | case SSH_SMSG_X11_OPEN: | |
2630 | error("Warning: ssh server tried X11 forwarding."); | |
2631 | break; | |
2632 | default: | |
7819b5c3 | 2633 | error("deny_input_open: type %d", type); |
a22aff1f | 2634 | break; |
2635 | } | |
2636 | error("Warning: this is probably a break in attempt by a malicious server."); | |
2637 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
2638 | packet_put_int(rchan); | |
2639 | packet_send(); | |
2640 | } | |
2641 | ||
aa3378df | 2642 | /* |
2643 | * Requests forwarding of X11 connections, generates fake authentication | |
2644 | * data, and enables authentication spoofing. | |
8e7895b8 | 2645 | * This should be called in the client only. |
aa3378df | 2646 | */ |
6ae2364d | 2647 | void |
0b242b12 | 2648 | x11_request_forwarding_with_spoofing(int client_session_id, |
2649 | const char *proto, const char *data) | |
8efc0c15 | 2650 | { |
1e3b8b07 | 2651 | u_int data_len = (u_int) strlen(data) / 2; |
ca910e13 | 2652 | u_int i, value, len; |
5260325f | 2653 | char *new_data; |
2654 | int screen_number; | |
2655 | const char *cp; | |
2656 | u_int32_t rand = 0; | |
2657 | ||
2658 | cp = getenv("DISPLAY"); | |
2659 | if (cp) | |
2660 | cp = strchr(cp, ':'); | |
2661 | if (cp) | |
2662 | cp = strchr(cp, '.'); | |
2663 | if (cp) | |
2664 | screen_number = atoi(cp + 1); | |
2665 | else | |
2666 | screen_number = 0; | |
2667 | ||
2668 | /* Save protocol name. */ | |
2669 | x11_saved_proto = xstrdup(proto); | |
2670 | ||
aa3378df | 2671 | /* |
2672 | * Extract real authentication data and generate fake data of the | |
2673 | * same length. | |
2674 | */ | |
5260325f | 2675 | x11_saved_data = xmalloc(data_len); |
2676 | x11_fake_data = xmalloc(data_len); | |
2677 | for (i = 0; i < data_len; i++) { | |
2678 | if (sscanf(data + 2 * i, "%2x", &value) != 1) | |
2679 | fatal("x11_request_forwarding: bad authentication data: %.100s", data); | |
2680 | if (i % 4 == 0) | |
2681 | rand = arc4random(); | |
2682 | x11_saved_data[i] = value; | |
2683 | x11_fake_data[i] = rand & 0xff; | |
2684 | rand >>= 8; | |
2685 | } | |
2686 | x11_saved_data_len = data_len; | |
2687 | x11_fake_data_len = data_len; | |
2688 | ||
2689 | /* Convert the fake data into hex. */ | |
ca910e13 | 2690 | len = 2 * data_len + 1; |
2691 | new_data = xmalloc(len); | |
5260325f | 2692 | for (i = 0; i < data_len; i++) |
ca910e13 | 2693 | snprintf(new_data + 2 * i, len - 2 * i, |
2694 | "%02x", (u_char) x11_fake_data[i]); | |
5260325f | 2695 | |
2696 | /* Send the request packet. */ | |
0b242b12 | 2697 | if (compat20) { |
2698 | channel_request_start(client_session_id, "x11-req", 0); | |
2699 | packet_put_char(0); /* XXX bool single connection */ | |
2700 | } else { | |
2701 | packet_start(SSH_CMSG_X11_REQUEST_FORWARDING); | |
2702 | } | |
2703 | packet_put_cstring(proto); | |
2704 | packet_put_cstring(new_data); | |
5260325f | 2705 | packet_put_int(screen_number); |
2706 | packet_send(); | |
2707 | packet_write_wait(); | |
2708 | xfree(new_data); | |
8efc0c15 | 2709 | } |
2710 | ||
8e7895b8 | 2711 | |
2712 | /* -- agent forwarding */ | |
2713 | ||
8efc0c15 | 2714 | /* Sends a message to the server to request authentication fd forwarding. */ |
2715 | ||
6ae2364d | 2716 | void |
d5bb9418 | 2717 | auth_request_forwarding(void) |
8efc0c15 | 2718 | { |
5260325f | 2719 | packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING); |
2720 | packet_send(); | |
2721 | packet_write_wait(); | |
8efc0c15 | 2722 | } |
2723 | ||
8efc0c15 | 2724 | /* This is called to process an SSH_SMSG_AGENT_OPEN message. */ |
2725 | ||
6ae2364d | 2726 | void |
7819b5c3 | 2727 | auth_input_open_request(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2728 | { |
719fc62f | 2729 | Channel *c = NULL; |
2730 | int remote_id, sock; | |
5260325f | 2731 | |
2732 | /* Read the remote channel number from the message. */ | |
719fc62f | 2733 | remote_id = packet_get_int(); |
95500969 | 2734 | packet_check_eom(); |
5260325f | 2735 | |
aa3378df | 2736 | /* |
2737 | * Get a connection to the local authentication agent (this may again | |
2738 | * get forwarded). | |
2739 | */ | |
5260325f | 2740 | sock = ssh_get_authentication_socket(); |
2741 | ||
aa3378df | 2742 | /* |
2743 | * If we could not connect the agent, send an error message back to | |
2744 | * the server. This should never happen unless the agent dies, | |
2745 | * because authentication forwarding is only enabled if we have an | |
2746 | * agent. | |
2747 | */ | |
719fc62f | 2748 | if (sock >= 0) { |
8e7895b8 | 2749 | c = channel_new("", SSH_CHANNEL_OPEN, sock, sock, |
0d942eff | 2750 | -1, 0, 0, 0, "authentication agent connection", 1); |
3a0d3d54 | 2751 | c->remote_id = remote_id; |
2752 | c->force_drain = 1; | |
719fc62f | 2753 | } |
2754 | if (c == NULL) { | |
5260325f | 2755 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
719fc62f | 2756 | packet_put_int(remote_id); |
2757 | } else { | |
2758 | /* Send a confirmation to the remote host. */ | |
2759 | debug("Forwarding authentication connection."); | |
2760 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
2761 | packet_put_int(remote_id); | |
2762 | packet_put_int(c->self); | |
5260325f | 2763 | } |
5260325f | 2764 | packet_send(); |
8efc0c15 | 2765 | } |