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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" | |
8cd0437d | 42 | RCSID("$OpenBSD: channels.c,v 1.225 2005/10/10 10:23:08 djm 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" |
f49658f5 | 57 | #include "bufaux.h" |
8efc0c15 | 58 | |
8e7895b8 | 59 | /* -- channel core */ |
8efc0c15 | 60 | |
fa1d7d85 | 61 | #define CHAN_RBUF 16*1024 |
62 | ||
aa3378df | 63 | /* |
64 | * Pointer to an array containing all allocated channels. The array is | |
65 | * dynamically extended as needed. | |
66 | */ | |
719fc62f | 67 | static Channel **channels = NULL; |
8efc0c15 | 68 | |
aa3378df | 69 | /* |
70 | * Size of the channel array. All slots of the array must always be | |
719fc62f | 71 | * initialized (at least the type field); unused slots set to NULL |
aa3378df | 72 | */ |
9a995072 | 73 | static u_int channels_alloc = 0; |
8efc0c15 | 74 | |
aa3378df | 75 | /* |
76 | * Maximum file descriptor value used in any of the channels. This is | |
719fc62f | 77 | * updated in channel_new. |
aa3378df | 78 | */ |
39929cdb | 79 | static int channel_max_fd = 0; |
8efc0c15 | 80 | |
8efc0c15 | 81 | |
8e7895b8 | 82 | /* -- tcp forwarding */ |
8efc0c15 | 83 | |
aa3378df | 84 | /* |
85 | * Data structure for storing which hosts are permitted for forward requests. | |
86 | * The local sides of any remote forwards are stored in this array to prevent | |
87 | * a corrupt remote server from accessing arbitrary TCP/IP ports on our local | |
88 | * network (which might be behind a firewall). | |
89 | */ | |
5260325f | 90 | typedef struct { |
7368a6c8 | 91 | char *host_to_connect; /* Connect to 'host'. */ |
92 | u_short port_to_connect; /* Connect to 'port'. */ | |
93 | u_short listen_port; /* Remote side should listen port number. */ | |
8efc0c15 | 94 | } ForwardPermission; |
95 | ||
96 | /* List of all permitted host/port pairs to connect. */ | |
97 | static ForwardPermission permitted_opens[SSH_MAX_FORWARDS_PER_DIRECTION]; | |
8e7895b8 | 98 | |
8efc0c15 | 99 | /* Number of permitted host/port pairs in the array. */ |
100 | static int num_permitted_opens = 0; | |
aa3378df | 101 | /* |
102 | * If this is true, all opens are permitted. This is the case on the server | |
103 | * on which we have to trust the client anyway, and the user could do | |
104 | * anything after logging in anyway. | |
105 | */ | |
8efc0c15 | 106 | static int all_opens_permitted = 0; |
107 | ||
8efc0c15 | 108 | |
8e7895b8 | 109 | /* -- X11 forwarding */ |
42f11eb2 | 110 | |
8e7895b8 | 111 | /* Maximum number of fake X11 displays to try. */ |
112 | #define MAX_DISPLAYS 1000 | |
0490e609 | 113 | |
ef07103c | 114 | /* Saved X11 local (client) display. */ |
115 | static char *x11_saved_display = NULL; | |
116 | ||
8e7895b8 | 117 | /* Saved X11 authentication protocol name. */ |
118 | static char *x11_saved_proto = NULL; | |
8efc0c15 | 119 | |
8e7895b8 | 120 | /* Saved X11 authentication data. This is the real data. */ |
121 | static char *x11_saved_data = NULL; | |
122 | static u_int x11_saved_data_len = 0; | |
123 | ||
124 | /* | |
125 | * Fake X11 authentication data. This is what the server will be sending us; | |
126 | * we should replace any occurrences of this by the real data. | |
127 | */ | |
128 | static char *x11_fake_data = NULL; | |
129 | static u_int x11_fake_data_len; | |
130 | ||
131 | ||
132 | /* -- agent forwarding */ | |
8efc0c15 | 133 | |
8e7895b8 | 134 | #define NUM_SOCKS 10 |
135 | ||
8e7895b8 | 136 | /* AF_UNSPEC or AF_INET or AF_INET6 */ |
5e4a7219 | 137 | static int IPv4or6 = AF_UNSPEC; |
8e7895b8 | 138 | |
139 | /* helper */ | |
396c147e | 140 | static void port_open_helper(Channel *c, char *rtype); |
8e7895b8 | 141 | |
142 | /* -- channel core */ | |
7368a6c8 | 143 | |
144 | Channel * | |
145 | channel_lookup(int id) | |
146 | { | |
147 | Channel *c; | |
719fc62f | 148 | |
9a995072 | 149 | if (id < 0 || (u_int)id >= channels_alloc) { |
bbe88b6d | 150 | logit("channel_lookup: %d: bad id", id); |
7368a6c8 | 151 | return NULL; |
152 | } | |
719fc62f | 153 | c = channels[id]; |
154 | if (c == NULL) { | |
bbe88b6d | 155 | logit("channel_lookup: %d: bad id: channel free", id); |
7368a6c8 | 156 | return NULL; |
157 | } | |
158 | return c; | |
159 | } | |
160 | ||
aa3378df | 161 | /* |
1d1ffb87 | 162 | * Register filedescriptors for a channel, used when allocating a channel or |
0fbe8c74 | 163 | * when the channel consumer/producer is ready, e.g. shell exec'd |
aa3378df | 164 | */ |
8efc0c15 | 165 | |
396c147e | 166 | static void |
a22aff1f | 167 | channel_register_fds(Channel *c, int rfd, int wfd, int efd, |
168 | int extusage, int nonblock) | |
8efc0c15 | 169 | { |
5260325f | 170 | /* Update the maximum file descriptor value. */ |
39929cdb | 171 | channel_max_fd = MAX(channel_max_fd, rfd); |
172 | channel_max_fd = MAX(channel_max_fd, wfd); | |
173 | channel_max_fd = MAX(channel_max_fd, efd); | |
174 | ||
aa3378df | 175 | /* XXX set close-on-exec -markus */ |
1d1ffb87 | 176 | |
0fbe8c74 | 177 | c->rfd = rfd; |
178 | c->wfd = wfd; | |
179 | c->sock = (rfd == wfd) ? rfd : -1; | |
5e96b616 | 180 | c->ctl_fd = -1; /* XXX: set elsewhere */ |
0fbe8c74 | 181 | c->efd = efd; |
182 | c->extended_usage = extusage; | |
a22aff1f | 183 | |
0ae4fe1d | 184 | /* XXX ugly hack: nonblock is only set by the server */ |
185 | if (nonblock && isatty(c->rfd)) { | |
d7ac5f18 | 186 | debug2("channel %d: rfd %d isatty", c->self, c->rfd); |
0ae4fe1d | 187 | c->isatty = 1; |
188 | if (!isatty(c->wfd)) { | |
94dfb550 | 189 | error("channel %d: wfd %d is not a tty?", |
0ae4fe1d | 190 | c->self, c->wfd); |
191 | } | |
192 | } else { | |
193 | c->isatty = 0; | |
194 | } | |
21c2c5cd | 195 | c->wfd_isatty = isatty(c->wfd); |
0ae4fe1d | 196 | |
a22aff1f | 197 | /* enable nonblocking mode */ |
198 | if (nonblock) { | |
199 | if (rfd != -1) | |
200 | set_nonblock(rfd); | |
201 | if (wfd != -1) | |
202 | set_nonblock(wfd); | |
203 | if (efd != -1) | |
204 | set_nonblock(efd); | |
205 | } | |
0fbe8c74 | 206 | } |
207 | ||
208 | /* | |
209 | * Allocate a new channel object and set its type and socket. This will cause | |
210 | * remote_name to be freed. | |
211 | */ | |
212 | ||
719fc62f | 213 | Channel * |
0fbe8c74 | 214 | channel_new(char *ctype, int type, int rfd, int wfd, int efd, |
f91d9a89 | 215 | u_int window, u_int maxpack, int extusage, char *remote_name, int nonblock) |
0fbe8c74 | 216 | { |
9a995072 | 217 | int found; |
218 | u_int i; | |
0fbe8c74 | 219 | Channel *c; |
5260325f | 220 | |
221 | /* Do initial allocation if this is the first call. */ | |
222 | if (channels_alloc == 0) { | |
223 | channels_alloc = 10; | |
719fc62f | 224 | channels = xmalloc(channels_alloc * sizeof(Channel *)); |
5260325f | 225 | for (i = 0; i < channels_alloc; i++) |
719fc62f | 226 | channels[i] = NULL; |
5260325f | 227 | } |
228 | /* Try to find a free slot where to put the new channel. */ | |
229 | for (found = -1, i = 0; i < channels_alloc; i++) | |
719fc62f | 230 | if (channels[i] == NULL) { |
5260325f | 231 | /* Found a free slot. */ |
9a995072 | 232 | found = (int)i; |
5260325f | 233 | break; |
234 | } | |
9a995072 | 235 | if (found < 0) { |
aa3378df | 236 | /* There are no free slots. Take last+1 slot and expand the array. */ |
5260325f | 237 | found = channels_alloc; |
5df8c731 | 238 | if (channels_alloc > 10000) |
239 | fatal("channel_new: internal error: channels_alloc %d " | |
240 | "too big.", channels_alloc); | |
20419cc1 | 241 | channels = xrealloc(channels, |
242 | (channels_alloc + 10) * sizeof(Channel *)); | |
243 | channels_alloc += 10; | |
de273eef | 244 | debug2("channel: expanding %d", channels_alloc); |
5260325f | 245 | for (i = found; i < channels_alloc; i++) |
719fc62f | 246 | channels[i] = NULL; |
5260325f | 247 | } |
719fc62f | 248 | /* Initialize and return new channel. */ |
249 | c = channels[found] = xmalloc(sizeof(Channel)); | |
639cb8ab | 250 | memset(c, 0, sizeof(Channel)); |
5260325f | 251 | buffer_init(&c->input); |
252 | buffer_init(&c->output); | |
7368a6c8 | 253 | buffer_init(&c->extended); |
70bef40e | 254 | c->ostate = CHAN_OUTPUT_OPEN; |
255 | c->istate = CHAN_INPUT_OPEN; | |
256 | c->flags = 0; | |
a22aff1f | 257 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock); |
5260325f | 258 | c->self = found; |
259 | c->type = type; | |
7368a6c8 | 260 | c->ctype = ctype; |
0b242b12 | 261 | c->local_window = window; |
262 | c->local_window_max = window; | |
263 | c->local_consumed = 0; | |
264 | c->local_maxpacket = maxpack; | |
5260325f | 265 | c->remote_id = -1; |
0d942eff | 266 | c->remote_name = xstrdup(remote_name); |
7368a6c8 | 267 | c->remote_window = 0; |
268 | c->remote_maxpacket = 0; | |
a5f82435 | 269 | c->force_drain = 0; |
ac151b18 | 270 | c->single_connection = 0; |
3cf2be58 | 271 | c->detach_user = NULL; |
8cd0437d | 272 | c->detach_close = 0; |
05ca0898 | 273 | c->confirm = NULL; |
5e96b616 | 274 | c->confirm_ctx = NULL; |
2e73a022 | 275 | c->input_filter = NULL; |
5260325f | 276 | debug("channel %d: new [%s]", found, remote_name); |
719fc62f | 277 | return c; |
7368a6c8 | 278 | } |
8efc0c15 | 279 | |
489aa2e9 | 280 | static int |
281 | channel_find_maxfd(void) | |
282 | { | |
9a995072 | 283 | u_int i; |
284 | int max = 0; | |
489aa2e9 | 285 | Channel *c; |
286 | ||
287 | for (i = 0; i < channels_alloc; i++) { | |
288 | c = channels[i]; | |
289 | if (c != NULL) { | |
290 | max = MAX(max, c->rfd); | |
291 | max = MAX(max, c->wfd); | |
292 | max = MAX(max, c->efd); | |
293 | } | |
294 | } | |
295 | return max; | |
296 | } | |
297 | ||
298 | int | |
299 | channel_close_fd(int *fdp) | |
300 | { | |
301 | int ret = 0, fd = *fdp; | |
302 | ||
303 | if (fd != -1) { | |
304 | ret = close(fd); | |
305 | *fdp = -1; | |
306 | if (fd == channel_max_fd) | |
307 | channel_max_fd = channel_find_maxfd(); | |
308 | } | |
309 | return ret; | |
310 | } | |
311 | ||
0fbe8c74 | 312 | /* Close all channel fd/socket. */ |
313 | ||
396c147e | 314 | static void |
0fbe8c74 | 315 | channel_close_fds(Channel *c) |
316 | { | |
5e96b616 | 317 | debug3("channel %d: close_fds r %d w %d e %d c %d", |
318 | c->self, c->rfd, c->wfd, c->efd, c->ctl_fd); | |
6fd8622b | 319 | |
489aa2e9 | 320 | channel_close_fd(&c->sock); |
5e96b616 | 321 | channel_close_fd(&c->ctl_fd); |
489aa2e9 | 322 | channel_close_fd(&c->rfd); |
323 | channel_close_fd(&c->wfd); | |
324 | channel_close_fd(&c->efd); | |
0fbe8c74 | 325 | } |
326 | ||
8e7895b8 | 327 | /* Free the channel and close its fd/socket. */ |
328 | ||
329 | void | |
330 | channel_free(Channel *c) | |
331 | { | |
332 | char *s; | |
9a995072 | 333 | u_int i, n; |
8e7895b8 | 334 | |
335 | for (n = 0, i = 0; i < channels_alloc; i++) | |
336 | if (channels[i]) | |
337 | n++; | |
9a995072 | 338 | debug("channel %d: free: %s, nchannels %u", c->self, |
8e7895b8 | 339 | c->remote_name ? c->remote_name : "???", n); |
340 | ||
341 | s = channel_open_message(); | |
d7ac5f18 | 342 | debug3("channel %d: status: %s", c->self, s); |
8e7895b8 | 343 | xfree(s); |
344 | ||
8e7895b8 | 345 | if (c->sock != -1) |
346 | shutdown(c->sock, SHUT_RDWR); | |
5e96b616 | 347 | if (c->ctl_fd != -1) |
348 | shutdown(c->ctl_fd, SHUT_RDWR); | |
8e7895b8 | 349 | channel_close_fds(c); |
350 | buffer_free(&c->input); | |
351 | buffer_free(&c->output); | |
352 | buffer_free(&c->extended); | |
353 | if (c->remote_name) { | |
354 | xfree(c->remote_name); | |
355 | c->remote_name = NULL; | |
356 | } | |
357 | channels[c->self] = NULL; | |
358 | xfree(c); | |
359 | } | |
360 | ||
8e7895b8 | 361 | void |
d6746a0b | 362 | channel_free_all(void) |
8e7895b8 | 363 | { |
9a995072 | 364 | u_int i; |
8e7895b8 | 365 | |
d6746a0b | 366 | for (i = 0; i < channels_alloc; i++) |
367 | if (channels[i] != NULL) | |
368 | channel_free(channels[i]); | |
8e7895b8 | 369 | } |
370 | ||
371 | /* | |
372 | * Closes the sockets/fds of all channels. This is used to close extra file | |
373 | * descriptors after a fork. | |
374 | */ | |
375 | ||
376 | void | |
d5bb9418 | 377 | channel_close_all(void) |
8e7895b8 | 378 | { |
9a995072 | 379 | u_int i; |
8e7895b8 | 380 | |
381 | for (i = 0; i < channels_alloc; i++) | |
382 | if (channels[i] != NULL) | |
383 | channel_close_fds(channels[i]); | |
384 | } | |
385 | ||
3cf2be58 | 386 | /* |
387 | * Stop listening to channels. | |
388 | */ | |
389 | ||
390 | void | |
391 | channel_stop_listening(void) | |
392 | { | |
9a995072 | 393 | u_int i; |
3cf2be58 | 394 | Channel *c; |
395 | ||
396 | for (i = 0; i < channels_alloc; i++) { | |
397 | c = channels[i]; | |
398 | if (c != NULL) { | |
399 | switch (c->type) { | |
400 | case SSH_CHANNEL_AUTH_SOCKET: | |
401 | case SSH_CHANNEL_PORT_LISTENER: | |
402 | case SSH_CHANNEL_RPORT_LISTENER: | |
403 | case SSH_CHANNEL_X11_LISTENER: | |
489aa2e9 | 404 | channel_close_fd(&c->sock); |
3cf2be58 | 405 | channel_free(c); |
406 | break; | |
407 | } | |
408 | } | |
409 | } | |
410 | } | |
411 | ||
8e7895b8 | 412 | /* |
413 | * Returns true if no channel has too much buffered data, and false if one or | |
414 | * more channel is overfull. | |
415 | */ | |
416 | ||
417 | int | |
d5bb9418 | 418 | channel_not_very_much_buffered_data(void) |
8e7895b8 | 419 | { |
420 | u_int i; | |
421 | Channel *c; | |
422 | ||
423 | for (i = 0; i < channels_alloc; i++) { | |
424 | c = channels[i]; | |
425 | if (c != NULL && c->type == SSH_CHANNEL_OPEN) { | |
0c139bd1 | 426 | #if 0 |
427 | if (!compat20 && | |
428 | buffer_len(&c->input) > packet_get_maxsize()) { | |
faa483fa | 429 | debug2("channel %d: big input buffer %d", |
8e7895b8 | 430 | c->self, buffer_len(&c->input)); |
431 | return 0; | |
432 | } | |
0c139bd1 | 433 | #endif |
8e7895b8 | 434 | if (buffer_len(&c->output) > packet_get_maxsize()) { |
a27002e5 | 435 | debug2("channel %d: big output buffer %u > %u", |
0c139bd1 | 436 | c->self, buffer_len(&c->output), |
437 | packet_get_maxsize()); | |
8e7895b8 | 438 | return 0; |
439 | } | |
440 | } | |
441 | } | |
442 | return 1; | |
443 | } | |
444 | ||
445 | /* Returns true if any channel is still open. */ | |
446 | ||
447 | int | |
d5bb9418 | 448 | channel_still_open(void) |
8e7895b8 | 449 | { |
9a995072 | 450 | u_int i; |
8e7895b8 | 451 | Channel *c; |
452 | ||
453 | for (i = 0; i < channels_alloc; i++) { | |
454 | c = channels[i]; | |
455 | if (c == NULL) | |
456 | continue; | |
457 | switch (c->type) { | |
458 | case SSH_CHANNEL_X11_LISTENER: | |
459 | case SSH_CHANNEL_PORT_LISTENER: | |
460 | case SSH_CHANNEL_RPORT_LISTENER: | |
461 | case SSH_CHANNEL_CLOSED: | |
462 | case SSH_CHANNEL_AUTH_SOCKET: | |
463 | case SSH_CHANNEL_DYNAMIC: | |
464 | case SSH_CHANNEL_CONNECTING: | |
465 | case SSH_CHANNEL_ZOMBIE: | |
466 | continue; | |
467 | case SSH_CHANNEL_LARVAL: | |
468 | if (!compat20) | |
469 | fatal("cannot happen: SSH_CHANNEL_LARVAL"); | |
470 | continue; | |
471 | case SSH_CHANNEL_OPENING: | |
472 | case SSH_CHANNEL_OPEN: | |
473 | case SSH_CHANNEL_X11_OPEN: | |
474 | return 1; | |
475 | case SSH_CHANNEL_INPUT_DRAINING: | |
476 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
477 | if (!compat13) | |
478 | fatal("cannot happen: OUT_DRAIN"); | |
479 | return 1; | |
480 | default: | |
481 | fatal("channel_still_open: bad channel type %d", c->type); | |
482 | /* NOTREACHED */ | |
483 | } | |
484 | } | |
485 | return 0; | |
486 | } | |
487 | ||
488 | /* Returns the id of an open channel suitable for keepaliving */ | |
489 | ||
490 | int | |
d5bb9418 | 491 | channel_find_open(void) |
8e7895b8 | 492 | { |
9a995072 | 493 | u_int i; |
8e7895b8 | 494 | Channel *c; |
495 | ||
496 | for (i = 0; i < channels_alloc; i++) { | |
497 | c = channels[i]; | |
13de3560 | 498 | if (c == NULL || c->remote_id < 0) |
8e7895b8 | 499 | continue; |
500 | switch (c->type) { | |
501 | case SSH_CHANNEL_CLOSED: | |
502 | case SSH_CHANNEL_DYNAMIC: | |
503 | case SSH_CHANNEL_X11_LISTENER: | |
504 | case SSH_CHANNEL_PORT_LISTENER: | |
505 | case SSH_CHANNEL_RPORT_LISTENER: | |
506 | case SSH_CHANNEL_OPENING: | |
507 | case SSH_CHANNEL_CONNECTING: | |
508 | case SSH_CHANNEL_ZOMBIE: | |
509 | continue; | |
510 | case SSH_CHANNEL_LARVAL: | |
511 | case SSH_CHANNEL_AUTH_SOCKET: | |
512 | case SSH_CHANNEL_OPEN: | |
513 | case SSH_CHANNEL_X11_OPEN: | |
514 | return i; | |
515 | case SSH_CHANNEL_INPUT_DRAINING: | |
516 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
517 | if (!compat13) | |
518 | fatal("cannot happen: OUT_DRAIN"); | |
519 | return i; | |
520 | default: | |
521 | fatal("channel_find_open: bad channel type %d", c->type); | |
522 | /* NOTREACHED */ | |
523 | } | |
524 | } | |
525 | return -1; | |
526 | } | |
527 | ||
528 | ||
529 | /* | |
530 | * Returns a message describing the currently open forwarded connections, | |
531 | * suitable for sending to the client. The message contains crlf pairs for | |
532 | * newlines. | |
533 | */ | |
534 | ||
535 | char * | |
d5bb9418 | 536 | channel_open_message(void) |
8e7895b8 | 537 | { |
538 | Buffer buffer; | |
539 | Channel *c; | |
540 | char buf[1024], *cp; | |
9a995072 | 541 | u_int i; |
8e7895b8 | 542 | |
543 | buffer_init(&buffer); | |
544 | snprintf(buf, sizeof buf, "The following connections are open:\r\n"); | |
545 | buffer_append(&buffer, buf, strlen(buf)); | |
546 | for (i = 0; i < channels_alloc; i++) { | |
547 | c = channels[i]; | |
548 | if (c == NULL) | |
549 | continue; | |
550 | switch (c->type) { | |
551 | case SSH_CHANNEL_X11_LISTENER: | |
552 | case SSH_CHANNEL_PORT_LISTENER: | |
553 | case SSH_CHANNEL_RPORT_LISTENER: | |
554 | case SSH_CHANNEL_CLOSED: | |
555 | case SSH_CHANNEL_AUTH_SOCKET: | |
556 | case SSH_CHANNEL_ZOMBIE: | |
557 | continue; | |
558 | case SSH_CHANNEL_LARVAL: | |
559 | case SSH_CHANNEL_OPENING: | |
560 | case SSH_CHANNEL_CONNECTING: | |
561 | case SSH_CHANNEL_DYNAMIC: | |
562 | case SSH_CHANNEL_OPEN: | |
563 | case SSH_CHANNEL_X11_OPEN: | |
564 | case SSH_CHANNEL_INPUT_DRAINING: | |
565 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
5e96b616 | 566 | snprintf(buf, sizeof buf, |
567 | " #%d %.300s (t%d r%d i%d/%d o%d/%d fd %d/%d cfd %d)\r\n", | |
8e7895b8 | 568 | c->self, c->remote_name, |
569 | c->type, c->remote_id, | |
570 | c->istate, buffer_len(&c->input), | |
571 | c->ostate, buffer_len(&c->output), | |
5e96b616 | 572 | c->rfd, c->wfd, c->ctl_fd); |
8e7895b8 | 573 | buffer_append(&buffer, buf, strlen(buf)); |
574 | continue; | |
575 | default: | |
576 | fatal("channel_open_message: bad channel type %d", c->type); | |
577 | /* NOTREACHED */ | |
578 | } | |
579 | } | |
580 | buffer_append(&buffer, "\0", 1); | |
581 | cp = xstrdup(buffer_ptr(&buffer)); | |
582 | buffer_free(&buffer); | |
583 | return cp; | |
584 | } | |
585 | ||
586 | void | |
587 | channel_send_open(int id) | |
588 | { | |
589 | Channel *c = channel_lookup(id); | |
e1feb9bf | 590 | |
8e7895b8 | 591 | if (c == NULL) { |
bbe88b6d | 592 | logit("channel_send_open: %d: bad id", id); |
8e7895b8 | 593 | return; |
594 | } | |
6226a8f8 | 595 | debug2("channel %d: send open", id); |
8e7895b8 | 596 | packet_start(SSH2_MSG_CHANNEL_OPEN); |
597 | packet_put_cstring(c->ctype); | |
598 | packet_put_int(c->self); | |
599 | packet_put_int(c->local_window); | |
600 | packet_put_int(c->local_maxpacket); | |
601 | packet_send(); | |
602 | } | |
603 | ||
604 | void | |
6226a8f8 | 605 | channel_request_start(int id, char *service, int wantconfirm) |
8e7895b8 | 606 | { |
6226a8f8 | 607 | Channel *c = channel_lookup(id); |
e1feb9bf | 608 | |
8e7895b8 | 609 | if (c == NULL) { |
bbe88b6d | 610 | logit("channel_request_start: %d: unknown channel id", id); |
8e7895b8 | 611 | return; |
612 | } | |
5e96b616 | 613 | debug2("channel %d: request %s confirm %d", id, service, wantconfirm); |
8e7895b8 | 614 | packet_start(SSH2_MSG_CHANNEL_REQUEST); |
615 | packet_put_int(c->remote_id); | |
616 | packet_put_cstring(service); | |
617 | packet_put_char(wantconfirm); | |
618 | } | |
619 | void | |
5e96b616 | 620 | channel_register_confirm(int id, channel_callback_fn *fn, void *ctx) |
8e7895b8 | 621 | { |
622 | Channel *c = channel_lookup(id); | |
e1feb9bf | 623 | |
8e7895b8 | 624 | if (c == NULL) { |
bbe88b6d | 625 | logit("channel_register_comfirm: %d: bad id", id); |
8e7895b8 | 626 | return; |
627 | } | |
05ca0898 | 628 | c->confirm = fn; |
5e96b616 | 629 | c->confirm_ctx = ctx; |
8e7895b8 | 630 | } |
631 | void | |
8cd0437d | 632 | channel_register_cleanup(int id, channel_callback_fn *fn, int do_close) |
8e7895b8 | 633 | { |
634 | Channel *c = channel_lookup(id); | |
e1feb9bf | 635 | |
8e7895b8 | 636 | if (c == NULL) { |
bbe88b6d | 637 | logit("channel_register_cleanup: %d: bad id", id); |
8e7895b8 | 638 | return; |
639 | } | |
3cf2be58 | 640 | c->detach_user = fn; |
8cd0437d | 641 | c->detach_close = do_close; |
8e7895b8 | 642 | } |
643 | void | |
644 | channel_cancel_cleanup(int id) | |
645 | { | |
646 | Channel *c = channel_lookup(id); | |
e1feb9bf | 647 | |
8e7895b8 | 648 | if (c == NULL) { |
bbe88b6d | 649 | logit("channel_cancel_cleanup: %d: bad id", id); |
8e7895b8 | 650 | return; |
651 | } | |
3cf2be58 | 652 | c->detach_user = NULL; |
8cd0437d | 653 | c->detach_close = 0; |
8e7895b8 | 654 | } |
655 | void | |
656 | channel_register_filter(int id, channel_filter_fn *fn) | |
657 | { | |
658 | Channel *c = channel_lookup(id); | |
e1feb9bf | 659 | |
8e7895b8 | 660 | if (c == NULL) { |
bbe88b6d | 661 | logit("channel_register_filter: %d: bad id", id); |
8e7895b8 | 662 | return; |
663 | } | |
664 | c->input_filter = fn; | |
665 | } | |
666 | ||
6ae2364d | 667 | void |
8e7895b8 | 668 | channel_set_fds(int id, int rfd, int wfd, int efd, |
399d1ea6 | 669 | int extusage, int nonblock, u_int window_max) |
8efc0c15 | 670 | { |
8e7895b8 | 671 | Channel *c = channel_lookup(id); |
e1feb9bf | 672 | |
8e7895b8 | 673 | if (c == NULL || c->type != SSH_CHANNEL_LARVAL) |
674 | fatal("channel_activate for non-larval channel %d.", id); | |
675 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock); | |
676 | c->type = SSH_CHANNEL_OPEN; | |
399d1ea6 | 677 | c->local_window = c->local_window_max = window_max; |
8e7895b8 | 678 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
679 | packet_put_int(c->remote_id); | |
680 | packet_put_int(c->local_window); | |
681 | packet_send(); | |
8efc0c15 | 682 | } |
683 | ||
aa3378df | 684 | /* |
7368a6c8 | 685 | * 'channel_pre*' are called just before select() to add any bits relevant to |
686 | * channels in the select bitmasks. | |
aa3378df | 687 | */ |
7368a6c8 | 688 | /* |
689 | * 'channel_post*': perform any appropriate operations for channels which | |
690 | * have events pending. | |
691 | */ | |
692 | typedef void chan_fn(Channel *c, fd_set * readset, fd_set * writeset); | |
693 | chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE]; | |
694 | chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE]; | |
8efc0c15 | 695 | |
396c147e | 696 | static void |
7368a6c8 | 697 | channel_pre_listener(Channel *c, fd_set * readset, fd_set * writeset) |
8efc0c15 | 698 | { |
7368a6c8 | 699 | FD_SET(c->sock, readset); |
700 | } | |
5260325f | 701 | |
396c147e | 702 | static void |
97fb6912 | 703 | channel_pre_connecting(Channel *c, fd_set * readset, fd_set * writeset) |
704 | { | |
705 | debug3("channel %d: waiting for connection", c->self); | |
706 | FD_SET(c->sock, writeset); | |
707 | } | |
708 | ||
396c147e | 709 | static void |
7368a6c8 | 710 | channel_pre_open_13(Channel *c, fd_set * readset, fd_set * writeset) |
711 | { | |
712 | if (buffer_len(&c->input) < packet_get_maxsize()) | |
713 | FD_SET(c->sock, readset); | |
714 | if (buffer_len(&c->output) > 0) | |
715 | FD_SET(c->sock, writeset); | |
716 | } | |
5260325f | 717 | |
396c147e | 718 | static void |
0c0738d5 | 719 | channel_pre_open(Channel *c, fd_set * readset, fd_set * writeset) |
7368a6c8 | 720 | { |
0c0738d5 | 721 | u_int limit = compat20 ? c->remote_window : packet_get_maxsize(); |
5260325f | 722 | |
fa1d7d85 | 723 | /* check buffer limits */ |
724 | limit = MIN(limit, (BUFFER_MAX_LEN - BUFFER_MAX_CHUNK - CHAN_RBUF)); | |
725 | ||
7e7327a1 | 726 | if (c->istate == CHAN_INPUT_OPEN && |
0c0738d5 | 727 | limit > 0 && |
728 | buffer_len(&c->input) < limit) | |
7e7327a1 | 729 | FD_SET(c->rfd, readset); |
730 | if (c->ostate == CHAN_OUTPUT_OPEN || | |
731 | c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { | |
732 | if (buffer_len(&c->output) > 0) { | |
733 | FD_SET(c->wfd, writeset); | |
734 | } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { | |
d2296ed7 | 735 | if (CHANNEL_EFD_OUTPUT_ACTIVE(c)) |
4e2e5cfd | 736 | debug2("channel %d: obuf_empty delayed efd %d/(%d)", |
737 | c->self, c->efd, buffer_len(&c->extended)); | |
d2296ed7 | 738 | else |
739 | chan_obuf_empty(c); | |
7e7327a1 | 740 | } |
741 | } | |
742 | /** XXX check close conditions, too */ | |
0c0738d5 | 743 | if (compat20 && c->efd != -1) { |
7e7327a1 | 744 | if (c->extended_usage == CHAN_EXTENDED_WRITE && |
745 | buffer_len(&c->extended) > 0) | |
746 | FD_SET(c->efd, writeset); | |
d2296ed7 | 747 | else if (!(c->flags & CHAN_EOF_SENT) && |
748 | c->extended_usage == CHAN_EXTENDED_READ && | |
7e7327a1 | 749 | buffer_len(&c->extended) < c->remote_window) |
750 | FD_SET(c->efd, readset); | |
751 | } | |
5e96b616 | 752 | /* XXX: What about efd? races? */ |
f2107e97 | 753 | if (compat20 && c->ctl_fd != -1 && |
5e96b616 | 754 | c->istate == CHAN_INPUT_OPEN && c->ostate == CHAN_OUTPUT_OPEN) |
755 | FD_SET(c->ctl_fd, readset); | |
7e7327a1 | 756 | } |
757 | ||
396c147e | 758 | static void |
7368a6c8 | 759 | channel_pre_input_draining(Channel *c, fd_set * readset, fd_set * writeset) |
760 | { | |
761 | if (buffer_len(&c->input) == 0) { | |
762 | packet_start(SSH_MSG_CHANNEL_CLOSE); | |
763 | packet_put_int(c->remote_id); | |
764 | packet_send(); | |
765 | c->type = SSH_CHANNEL_CLOSED; | |
d7ac5f18 | 766 | debug2("channel %d: closing after input drain.", c->self); |
7368a6c8 | 767 | } |
768 | } | |
5260325f | 769 | |
396c147e | 770 | static void |
7368a6c8 | 771 | channel_pre_output_draining(Channel *c, fd_set * readset, fd_set * writeset) |
772 | { | |
773 | if (buffer_len(&c->output) == 0) | |
719fc62f | 774 | chan_mark_dead(c); |
6ae2364d | 775 | else |
7368a6c8 | 776 | FD_SET(c->sock, writeset); |
777 | } | |
5260325f | 778 | |
7368a6c8 | 779 | /* |
780 | * This is a special state for X11 authentication spoofing. An opened X11 | |
781 | * connection (when authentication spoofing is being done) remains in this | |
782 | * state until the first packet has been completely read. The authentication | |
783 | * data in that packet is then substituted by the real data if it matches the | |
784 | * fake data, and the channel is put into normal mode. | |
0b242b12 | 785 | * XXX All this happens at the client side. |
8e7895b8 | 786 | * Returns: 0 = need more data, -1 = wrong cookie, 1 = ok |
7368a6c8 | 787 | */ |
396c147e | 788 | static int |
8e7895b8 | 789 | x11_open_helper(Buffer *b) |
7368a6c8 | 790 | { |
1e3b8b07 | 791 | u_char *ucp; |
792 | u_int proto_len, data_len; | |
5260325f | 793 | |
7368a6c8 | 794 | /* Check if the fixed size part of the packet is in buffer. */ |
8e7895b8 | 795 | if (buffer_len(b) < 12) |
7368a6c8 | 796 | return 0; |
797 | ||
798 | /* Parse the lengths of variable-length fields. */ | |
20905a8e | 799 | ucp = buffer_ptr(b); |
7368a6c8 | 800 | if (ucp[0] == 0x42) { /* Byte order MSB first. */ |
801 | proto_len = 256 * ucp[6] + ucp[7]; | |
802 | data_len = 256 * ucp[8] + ucp[9]; | |
803 | } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */ | |
804 | proto_len = ucp[6] + 256 * ucp[7]; | |
805 | data_len = ucp[8] + 256 * ucp[9]; | |
806 | } else { | |
d7ac5f18 | 807 | debug2("Initial X11 packet contains bad byte order byte: 0x%x", |
184eed6a | 808 | ucp[0]); |
7368a6c8 | 809 | return -1; |
810 | } | |
5260325f | 811 | |
7368a6c8 | 812 | /* Check if the whole packet is in buffer. */ |
8e7895b8 | 813 | if (buffer_len(b) < |
7368a6c8 | 814 | 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3)) |
815 | return 0; | |
5260325f | 816 | |
7368a6c8 | 817 | /* Check if authentication protocol matches. */ |
818 | if (proto_len != strlen(x11_saved_proto) || | |
819 | memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) { | |
d7ac5f18 | 820 | debug2("X11 connection uses different authentication protocol."); |
7368a6c8 | 821 | return -1; |
822 | } | |
823 | /* Check if authentication data matches our fake data. */ | |
824 | if (data_len != x11_fake_data_len || | |
825 | memcmp(ucp + 12 + ((proto_len + 3) & ~3), | |
826 | x11_fake_data, x11_fake_data_len) != 0) { | |
d7ac5f18 | 827 | debug2("X11 auth data does not match fake data."); |
7368a6c8 | 828 | return -1; |
829 | } | |
830 | /* Check fake data length */ | |
831 | if (x11_fake_data_len != x11_saved_data_len) { | |
832 | error("X11 fake_data_len %d != saved_data_len %d", | |
833 | x11_fake_data_len, x11_saved_data_len); | |
834 | return -1; | |
835 | } | |
836 | /* | |
837 | * Received authentication protocol and data match | |
838 | * our fake data. Substitute the fake data with real | |
839 | * data. | |
840 | */ | |
841 | memcpy(ucp + 12 + ((proto_len + 3) & ~3), | |
842 | x11_saved_data, x11_saved_data_len); | |
843 | return 1; | |
844 | } | |
5260325f | 845 | |
396c147e | 846 | static void |
7368a6c8 | 847 | channel_pre_x11_open_13(Channel *c, fd_set * readset, fd_set * writeset) |
848 | { | |
8e7895b8 | 849 | int ret = x11_open_helper(&c->output); |
e1feb9bf | 850 | |
7368a6c8 | 851 | if (ret == 1) { |
852 | /* Start normal processing for the channel. */ | |
853 | c->type = SSH_CHANNEL_OPEN; | |
a8be9f80 | 854 | channel_pre_open_13(c, readset, writeset); |
7368a6c8 | 855 | } else if (ret == -1) { |
856 | /* | |
857 | * We have received an X11 connection that has bad | |
858 | * authentication information. | |
859 | */ | |
bbe88b6d | 860 | logit("X11 connection rejected because of wrong authentication."); |
7368a6c8 | 861 | buffer_clear(&c->input); |
862 | buffer_clear(&c->output); | |
489aa2e9 | 863 | channel_close_fd(&c->sock); |
7368a6c8 | 864 | c->sock = -1; |
865 | c->type = SSH_CHANNEL_CLOSED; | |
866 | packet_start(SSH_MSG_CHANNEL_CLOSE); | |
867 | packet_put_int(c->remote_id); | |
868 | packet_send(); | |
869 | } | |
870 | } | |
5260325f | 871 | |
396c147e | 872 | static void |
0b242b12 | 873 | channel_pre_x11_open(Channel *c, fd_set * readset, fd_set * writeset) |
7368a6c8 | 874 | { |
8e7895b8 | 875 | int ret = x11_open_helper(&c->output); |
a5f82435 | 876 | |
877 | /* c->force_drain = 1; */ | |
878 | ||
7368a6c8 | 879 | if (ret == 1) { |
880 | c->type = SSH_CHANNEL_OPEN; | |
0c0738d5 | 881 | channel_pre_open(c, readset, writeset); |
7368a6c8 | 882 | } else if (ret == -1) { |
bbe88b6d | 883 | logit("X11 connection rejected because of wrong authentication."); |
d7ac5f18 | 884 | debug2("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate); |
8341f420 | 885 | chan_read_failed(c); |
886 | buffer_clear(&c->input); | |
887 | chan_ibuf_empty(c); | |
888 | buffer_clear(&c->output); | |
889 | /* for proto v1, the peer will send an IEOF */ | |
890 | if (compat20) | |
891 | chan_write_failed(c); | |
892 | else | |
893 | c->type = SSH_CHANNEL_OPEN; | |
d7ac5f18 | 894 | debug2("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate); |
7368a6c8 | 895 | } |
896 | } | |
5260325f | 897 | |
28b9cb4d | 898 | /* try to decode a socks4 header */ |
396c147e | 899 | static int |
28b9cb4d | 900 | channel_decode_socks4(Channel *c, fd_set * readset, fd_set * writeset) |
0490e609 | 901 | { |
661e45a0 | 902 | char *p, *host; |
2ceb8101 | 903 | u_int len, have, i, found; |
184eed6a | 904 | char username[256]; |
0490e609 | 905 | struct { |
906 | u_int8_t version; | |
907 | u_int8_t command; | |
908 | u_int16_t dest_port; | |
28b9cb4d | 909 | struct in_addr dest_addr; |
0490e609 | 910 | } s4_req, s4_rsp; |
911 | ||
28b9cb4d | 912 | debug2("channel %d: decode socks4", c->self); |
53b8fe68 | 913 | |
914 | have = buffer_len(&c->input); | |
915 | len = sizeof(s4_req); | |
916 | if (have < len) | |
917 | return 0; | |
918 | p = buffer_ptr(&c->input); | |
919 | for (found = 0, i = len; i < have; i++) { | |
920 | if (p[i] == '\0') { | |
921 | found = 1; | |
922 | break; | |
923 | } | |
924 | if (i > 1024) { | |
925 | /* the peer is probably sending garbage */ | |
926 | debug("channel %d: decode socks4: too long", | |
927 | c->self); | |
928 | return -1; | |
929 | } | |
930 | } | |
931 | if (!found) | |
932 | return 0; | |
0490e609 | 933 | buffer_get(&c->input, (char *)&s4_req.version, 1); |
934 | buffer_get(&c->input, (char *)&s4_req.command, 1); | |
935 | buffer_get(&c->input, (char *)&s4_req.dest_port, 2); | |
28b9cb4d | 936 | buffer_get(&c->input, (char *)&s4_req.dest_addr, 4); |
53b8fe68 | 937 | have = buffer_len(&c->input); |
0490e609 | 938 | p = buffer_ptr(&c->input); |
939 | len = strlen(p); | |
6683b40f | 940 | debug2("channel %d: decode socks4: user %s/%d", c->self, p, len); |
0490e609 | 941 | if (len > have) |
28b9cb4d | 942 | fatal("channel %d: decode socks4: len %d > have %d", |
0490e609 | 943 | c->self, len, have); |
944 | strlcpy(username, p, sizeof(username)); | |
945 | buffer_consume(&c->input, len); | |
946 | buffer_consume(&c->input, 1); /* trailing '\0' */ | |
947 | ||
28b9cb4d | 948 | host = inet_ntoa(s4_req.dest_addr); |
0490e609 | 949 | strlcpy(c->path, host, sizeof(c->path)); |
950 | c->host_port = ntohs(s4_req.dest_port); | |
184eed6a | 951 | |
d7ac5f18 | 952 | debug2("channel %d: dynamic request: socks4 host %s port %u command %u", |
6683b40f | 953 | c->self, host, c->host_port, s4_req.command); |
0490e609 | 954 | |
28b9cb4d | 955 | if (s4_req.command != 1) { |
956 | debug("channel %d: cannot handle: socks4 cn %d", | |
957 | c->self, s4_req.command); | |
958 | return -1; | |
0490e609 | 959 | } |
28b9cb4d | 960 | s4_rsp.version = 0; /* vn: 0 for reply */ |
961 | s4_rsp.command = 90; /* cd: req granted */ | |
0490e609 | 962 | s4_rsp.dest_port = 0; /* ignored */ |
28b9cb4d | 963 | s4_rsp.dest_addr.s_addr = INADDR_ANY; /* ignored */ |
0490e609 | 964 | buffer_append(&c->output, (char *)&s4_rsp, sizeof(s4_rsp)); |
28b9cb4d | 965 | return 1; |
0490e609 | 966 | } |
967 | ||
f49658f5 | 968 | /* try to decode a socks5 header */ |
969 | #define SSH_SOCKS5_AUTHDONE 0x1000 | |
970 | #define SSH_SOCKS5_NOAUTH 0x00 | |
971 | #define SSH_SOCKS5_IPV4 0x01 | |
972 | #define SSH_SOCKS5_DOMAIN 0x03 | |
973 | #define SSH_SOCKS5_IPV6 0x04 | |
974 | #define SSH_SOCKS5_CONNECT 0x01 | |
975 | #define SSH_SOCKS5_SUCCESS 0x00 | |
976 | ||
977 | static int | |
978 | channel_decode_socks5(Channel *c, fd_set * readset, fd_set * writeset) | |
979 | { | |
980 | struct { | |
981 | u_int8_t version; | |
982 | u_int8_t command; | |
983 | u_int8_t reserved; | |
984 | u_int8_t atyp; | |
985 | } s5_req, s5_rsp; | |
986 | u_int16_t dest_port; | |
987 | u_char *p, dest_addr[255+1]; | |
2ceb8101 | 988 | u_int have, i, found, nmethods, addrlen, af; |
f49658f5 | 989 | |
990 | debug2("channel %d: decode socks5", c->self); | |
991 | p = buffer_ptr(&c->input); | |
992 | if (p[0] != 0x05) | |
993 | return -1; | |
994 | have = buffer_len(&c->input); | |
995 | if (!(c->flags & SSH_SOCKS5_AUTHDONE)) { | |
996 | /* format: ver | nmethods | methods */ | |
aff51935 | 997 | if (have < 2) |
f49658f5 | 998 | return 0; |
999 | nmethods = p[1]; | |
1000 | if (have < nmethods + 2) | |
1001 | return 0; | |
1002 | /* look for method: "NO AUTHENTICATION REQUIRED" */ | |
1003 | for (found = 0, i = 2 ; i < nmethods + 2; i++) { | |
1004 | if (p[i] == SSH_SOCKS5_NOAUTH ) { | |
1005 | found = 1; | |
1006 | break; | |
1007 | } | |
1008 | } | |
1009 | if (!found) { | |
1010 | debug("channel %d: method SSH_SOCKS5_NOAUTH not found", | |
1011 | c->self); | |
1012 | return -1; | |
1013 | } | |
1014 | buffer_consume(&c->input, nmethods + 2); | |
1015 | buffer_put_char(&c->output, 0x05); /* version */ | |
1016 | buffer_put_char(&c->output, SSH_SOCKS5_NOAUTH); /* method */ | |
1017 | FD_SET(c->sock, writeset); | |
1018 | c->flags |= SSH_SOCKS5_AUTHDONE; | |
1019 | debug2("channel %d: socks5 auth done", c->self); | |
1020 | return 0; /* need more */ | |
1021 | } | |
1022 | debug2("channel %d: socks5 post auth", c->self); | |
1023 | if (have < sizeof(s5_req)+1) | |
1024 | return 0; /* need more */ | |
1025 | memcpy((char *)&s5_req, p, sizeof(s5_req)); | |
1026 | if (s5_req.version != 0x05 || | |
1027 | s5_req.command != SSH_SOCKS5_CONNECT || | |
1028 | s5_req.reserved != 0x00) { | |
d7ac5f18 | 1029 | debug2("channel %d: only socks5 connect supported", c->self); |
f49658f5 | 1030 | return -1; |
1031 | } | |
f8cc7664 | 1032 | switch (s5_req.atyp){ |
f49658f5 | 1033 | case SSH_SOCKS5_IPV4: |
1034 | addrlen = 4; | |
1035 | af = AF_INET; | |
1036 | break; | |
1037 | case SSH_SOCKS5_DOMAIN: | |
1038 | addrlen = p[sizeof(s5_req)]; | |
1039 | af = -1; | |
1040 | break; | |
1041 | case SSH_SOCKS5_IPV6: | |
1042 | addrlen = 16; | |
1043 | af = AF_INET6; | |
1044 | break; | |
1045 | default: | |
d7ac5f18 | 1046 | debug2("channel %d: bad socks5 atyp %d", c->self, s5_req.atyp); |
f49658f5 | 1047 | return -1; |
1048 | } | |
1049 | if (have < 4 + addrlen + 2) | |
1050 | return 0; | |
1051 | buffer_consume(&c->input, sizeof(s5_req)); | |
1052 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) | |
1053 | buffer_consume(&c->input, 1); /* host string length */ | |
1054 | buffer_get(&c->input, (char *)&dest_addr, addrlen); | |
1055 | buffer_get(&c->input, (char *)&dest_port, 2); | |
1056 | dest_addr[addrlen] = '\0'; | |
1057 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) | |
f6be21a0 | 1058 | strlcpy(c->path, (char *)dest_addr, sizeof(c->path)); |
f49658f5 | 1059 | else if (inet_ntop(af, dest_addr, c->path, sizeof(c->path)) == NULL) |
1060 | return -1; | |
1061 | c->host_port = ntohs(dest_port); | |
b6453d99 | 1062 | |
d7ac5f18 | 1063 | debug2("channel %d: dynamic request: socks5 host %s port %u command %u", |
f49658f5 | 1064 | c->self, c->path, c->host_port, s5_req.command); |
1065 | ||
1066 | s5_rsp.version = 0x05; | |
1067 | s5_rsp.command = SSH_SOCKS5_SUCCESS; | |
1068 | s5_rsp.reserved = 0; /* ignored */ | |
1069 | s5_rsp.atyp = SSH_SOCKS5_IPV4; | |
1070 | ((struct in_addr *)&dest_addr)->s_addr = INADDR_ANY; | |
1071 | dest_port = 0; /* ignored */ | |
1072 | ||
1073 | buffer_append(&c->output, (char *)&s5_rsp, sizeof(s5_rsp)); | |
1074 | buffer_append(&c->output, (char *)&dest_addr, sizeof(struct in_addr)); | |
1075 | buffer_append(&c->output, (char *)&dest_port, sizeof(dest_port)); | |
1076 | return 1; | |
1077 | } | |
1078 | ||
28b9cb4d | 1079 | /* dynamic port forwarding */ |
396c147e | 1080 | static void |
28b9cb4d | 1081 | channel_pre_dynamic(Channel *c, fd_set * readset, fd_set * writeset) |
1082 | { | |
1083 | u_char *p; | |
2ceb8101 | 1084 | u_int have; |
1085 | int ret; | |
28b9cb4d | 1086 | |
1087 | have = buffer_len(&c->input); | |
639cb8ab | 1088 | c->delayed = 0; |
28b9cb4d | 1089 | debug2("channel %d: pre_dynamic: have %d", c->self, have); |
070adba2 | 1090 | /* buffer_dump(&c->input); */ |
28b9cb4d | 1091 | /* check if the fixed size part of the packet is in buffer. */ |
f49658f5 | 1092 | if (have < 3) { |
28b9cb4d | 1093 | /* need more */ |
1094 | FD_SET(c->sock, readset); | |
1095 | return; | |
1096 | } | |
1097 | /* try to guess the protocol */ | |
1098 | p = buffer_ptr(&c->input); | |
1099 | switch (p[0]) { | |
6683b40f | 1100 | case 0x04: |
1101 | ret = channel_decode_socks4(c, readset, writeset); | |
1102 | break; | |
f49658f5 | 1103 | case 0x05: |
1104 | ret = channel_decode_socks5(c, readset, writeset); | |
1105 | break; | |
28b9cb4d | 1106 | default: |
1107 | ret = -1; | |
1108 | break; | |
1109 | } | |
1110 | if (ret < 0) { | |
719fc62f | 1111 | chan_mark_dead(c); |
28b9cb4d | 1112 | } else if (ret == 0) { |
1113 | debug2("channel %d: pre_dynamic: need more", c->self); | |
1114 | /* need more */ | |
1115 | FD_SET(c->sock, readset); | |
1116 | } else { | |
1117 | /* switch to the next state */ | |
1118 | c->type = SSH_CHANNEL_OPENING; | |
1119 | port_open_helper(c, "direct-tcpip"); | |
1120 | } | |
1121 | } | |
0490e609 | 1122 | |
7368a6c8 | 1123 | /* This is our fake X11 server socket. */ |
396c147e | 1124 | static void |
7368a6c8 | 1125 | channel_post_x11_listener(Channel *c, fd_set * readset, fd_set * writeset) |
1126 | { | |
719fc62f | 1127 | Channel *nc; |
7368a6c8 | 1128 | struct sockaddr addr; |
bcc0381e | 1129 | int newsock; |
7368a6c8 | 1130 | socklen_t addrlen; |
865ac82e | 1131 | char buf[16384], *remote_ipaddr; |
0b242b12 | 1132 | int remote_port; |
7368a6c8 | 1133 | |
1134 | if (FD_ISSET(c->sock, readset)) { | |
1135 | debug("X11 connection requested."); | |
1136 | addrlen = sizeof(addr); | |
1137 | newsock = accept(c->sock, &addr, &addrlen); | |
ac151b18 | 1138 | if (c->single_connection) { |
d7ac5f18 | 1139 | debug2("single_connection: closing X11 listener."); |
ac151b18 | 1140 | channel_close_fd(&c->sock); |
1141 | chan_mark_dead(c); | |
1142 | } | |
7368a6c8 | 1143 | if (newsock < 0) { |
1144 | error("accept: %.100s", strerror(errno)); | |
1145 | return; | |
5260325f | 1146 | } |
bcc0381e | 1147 | set_nodelay(newsock); |
865ac82e | 1148 | remote_ipaddr = get_peer_ipaddr(newsock); |
0b242b12 | 1149 | remote_port = get_peer_port(newsock); |
7368a6c8 | 1150 | snprintf(buf, sizeof buf, "X11 connection from %.200s port %d", |
865ac82e | 1151 | remote_ipaddr, remote_port); |
0b242b12 | 1152 | |
719fc62f | 1153 | nc = channel_new("accepted x11 socket", |
0b242b12 | 1154 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
0d942eff | 1155 | c->local_window_max, c->local_maxpacket, 0, buf, 1); |
0b242b12 | 1156 | if (compat20) { |
1157 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1158 | packet_put_cstring("x11"); | |
719fc62f | 1159 | packet_put_int(nc->self); |
ac151b18 | 1160 | packet_put_int(nc->local_window_max); |
1161 | packet_put_int(nc->local_maxpacket); | |
865ac82e | 1162 | /* originator ipaddr and port */ |
1163 | packet_put_cstring(remote_ipaddr); | |
d0c832f3 | 1164 | if (datafellows & SSH_BUG_X11FWD) { |
d7ac5f18 | 1165 | debug2("ssh2 x11 bug compat mode"); |
d0c832f3 | 1166 | } else { |
1167 | packet_put_int(remote_port); | |
1168 | } | |
0b242b12 | 1169 | packet_send(); |
1170 | } else { | |
1171 | packet_start(SSH_SMSG_X11_OPEN); | |
719fc62f | 1172 | packet_put_int(nc->self); |
8e7895b8 | 1173 | if (packet_get_protocol_flags() & |
1174 | SSH_PROTOFLAG_HOST_IN_FWD_OPEN) | |
449c5ba5 | 1175 | packet_put_cstring(buf); |
0b242b12 | 1176 | packet_send(); |
1177 | } | |
865ac82e | 1178 | xfree(remote_ipaddr); |
8efc0c15 | 1179 | } |
8efc0c15 | 1180 | } |
1181 | ||
396c147e | 1182 | static void |
0490e609 | 1183 | port_open_helper(Channel *c, char *rtype) |
1184 | { | |
1185 | int direct; | |
1186 | char buf[1024]; | |
1187 | char *remote_ipaddr = get_peer_ipaddr(c->sock); | |
29798ed0 | 1188 | int remote_port = get_peer_port(c->sock); |
0490e609 | 1189 | |
1190 | direct = (strcmp(rtype, "direct-tcpip") == 0); | |
1191 | ||
1192 | snprintf(buf, sizeof buf, | |
1193 | "%s: listening port %d for %.100s port %d, " | |
1194 | "connect from %.200s port %d", | |
1195 | rtype, c->listening_port, c->path, c->host_port, | |
1196 | remote_ipaddr, remote_port); | |
1197 | ||
1198 | xfree(c->remote_name); | |
1199 | c->remote_name = xstrdup(buf); | |
1200 | ||
1201 | if (compat20) { | |
1202 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1203 | packet_put_cstring(rtype); | |
1204 | packet_put_int(c->self); | |
1205 | packet_put_int(c->local_window_max); | |
1206 | packet_put_int(c->local_maxpacket); | |
1207 | if (direct) { | |
1208 | /* target host, port */ | |
1209 | packet_put_cstring(c->path); | |
1210 | packet_put_int(c->host_port); | |
1211 | } else { | |
1212 | /* listen address, port */ | |
1213 | packet_put_cstring(c->path); | |
1214 | packet_put_int(c->listening_port); | |
1215 | } | |
1216 | /* originator host and port */ | |
1217 | packet_put_cstring(remote_ipaddr); | |
29798ed0 | 1218 | packet_put_int((u_int)remote_port); |
0490e609 | 1219 | packet_send(); |
1220 | } else { | |
1221 | packet_start(SSH_MSG_PORT_OPEN); | |
1222 | packet_put_int(c->self); | |
1223 | packet_put_cstring(c->path); | |
1224 | packet_put_int(c->host_port); | |
8e7895b8 | 1225 | if (packet_get_protocol_flags() & |
1226 | SSH_PROTOFLAG_HOST_IN_FWD_OPEN) | |
0490e609 | 1227 | packet_put_cstring(c->remote_name); |
1228 | packet_send(); | |
1229 | } | |
1230 | xfree(remote_ipaddr); | |
1231 | } | |
1232 | ||
aa3378df | 1233 | /* |
7368a6c8 | 1234 | * This socket is listening for connections to a forwarded TCP/IP port. |
aa3378df | 1235 | */ |
396c147e | 1236 | static void |
7368a6c8 | 1237 | channel_post_port_listener(Channel *c, fd_set * readset, fd_set * writeset) |
1238 | { | |
0490e609 | 1239 | Channel *nc; |
7368a6c8 | 1240 | struct sockaddr addr; |
719fc62f | 1241 | int newsock, nextstate; |
7368a6c8 | 1242 | socklen_t addrlen; |
0490e609 | 1243 | char *rtype; |
fa08c86b | 1244 | |
7368a6c8 | 1245 | if (FD_ISSET(c->sock, readset)) { |
1246 | debug("Connection to port %d forwarding " | |
1247 | "to %.100s port %d requested.", | |
1248 | c->listening_port, c->path, c->host_port); | |
0490e609 | 1249 | |
639cb8ab | 1250 | if (c->type == SSH_CHANNEL_RPORT_LISTENER) { |
1251 | nextstate = SSH_CHANNEL_OPENING; | |
1252 | rtype = "forwarded-tcpip"; | |
1253 | } else { | |
1254 | if (c->host_port == 0) { | |
1255 | nextstate = SSH_CHANNEL_DYNAMIC; | |
f3964cb9 | 1256 | rtype = "dynamic-tcpip"; |
639cb8ab | 1257 | } else { |
1258 | nextstate = SSH_CHANNEL_OPENING; | |
1259 | rtype = "direct-tcpip"; | |
1260 | } | |
1261 | } | |
0490e609 | 1262 | |
7368a6c8 | 1263 | addrlen = sizeof(addr); |
1264 | newsock = accept(c->sock, &addr, &addrlen); | |
1265 | if (newsock < 0) { | |
1266 | error("accept: %.100s", strerror(errno)); | |
1267 | return; | |
1268 | } | |
811a6342 | 1269 | set_nodelay(newsock); |
0d942eff | 1270 | nc = channel_new(rtype, nextstate, newsock, newsock, -1, |
1271 | c->local_window_max, c->local_maxpacket, 0, rtype, 1); | |
0490e609 | 1272 | nc->listening_port = c->listening_port; |
1273 | nc->host_port = c->host_port; | |
1274 | strlcpy(nc->path, c->path, sizeof(nc->path)); | |
1275 | ||
639cb8ab | 1276 | if (nextstate == SSH_CHANNEL_DYNAMIC) { |
1277 | /* | |
1278 | * do not call the channel_post handler until | |
1279 | * this flag has been reset by a pre-handler. | |
1280 | * otherwise the FD_ISSET calls might overflow | |
1281 | */ | |
1282 | nc->delayed = 1; | |
1283 | } else { | |
0490e609 | 1284 | port_open_helper(nc, rtype); |
639cb8ab | 1285 | } |
7368a6c8 | 1286 | } |
1287 | } | |
8efc0c15 | 1288 | |
7368a6c8 | 1289 | /* |
1290 | * This is the authentication agent socket listening for connections from | |
1291 | * clients. | |
1292 | */ | |
396c147e | 1293 | static void |
7368a6c8 | 1294 | channel_post_auth_listener(Channel *c, fd_set * readset, fd_set * writeset) |
8efc0c15 | 1295 | { |
719fc62f | 1296 | Channel *nc; |
1297 | int newsock; | |
5260325f | 1298 | struct sockaddr addr; |
48e671d5 | 1299 | socklen_t addrlen; |
5260325f | 1300 | |
7368a6c8 | 1301 | if (FD_ISSET(c->sock, readset)) { |
1302 | addrlen = sizeof(addr); | |
1303 | newsock = accept(c->sock, &addr, &addrlen); | |
1304 | if (newsock < 0) { | |
1305 | error("accept from auth socket: %.100s", strerror(errno)); | |
1306 | return; | |
1307 | } | |
719fc62f | 1308 | nc = channel_new("accepted auth socket", |
fa08c86b | 1309 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
1310 | c->local_window_max, c->local_maxpacket, | |
0d942eff | 1311 | 0, "accepted auth socket", 1); |
fa08c86b | 1312 | if (compat20) { |
1313 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1314 | packet_put_cstring("auth-agent@openssh.com"); | |
719fc62f | 1315 | packet_put_int(nc->self); |
fa08c86b | 1316 | packet_put_int(c->local_window_max); |
1317 | packet_put_int(c->local_maxpacket); | |
1318 | } else { | |
1319 | packet_start(SSH_SMSG_AGENT_OPEN); | |
719fc62f | 1320 | packet_put_int(nc->self); |
fa08c86b | 1321 | } |
7368a6c8 | 1322 | packet_send(); |
1323 | } | |
1324 | } | |
5260325f | 1325 | |
396c147e | 1326 | static void |
97fb6912 | 1327 | channel_post_connecting(Channel *c, fd_set * readset, fd_set * writeset) |
1328 | { | |
d18e0850 | 1329 | int err = 0; |
8ab2cb35 | 1330 | socklen_t sz = sizeof(err); |
d18e0850 | 1331 | |
97fb6912 | 1332 | if (FD_ISSET(c->sock, writeset)) { |
db518d9b | 1333 | if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, &err, &sz) < 0) { |
d18e0850 | 1334 | err = errno; |
1335 | error("getsockopt SO_ERROR failed"); | |
1336 | } | |
1337 | if (err == 0) { | |
1338 | debug("channel %d: connected", c->self); | |
1339 | c->type = SSH_CHANNEL_OPEN; | |
1340 | if (compat20) { | |
1341 | packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1342 | packet_put_int(c->remote_id); | |
1343 | packet_put_int(c->self); | |
1344 | packet_put_int(c->local_window); | |
1345 | packet_put_int(c->local_maxpacket); | |
1346 | } else { | |
1347 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1348 | packet_put_int(c->remote_id); | |
1349 | packet_put_int(c->self); | |
1350 | } | |
97fb6912 | 1351 | } else { |
d18e0850 | 1352 | debug("channel %d: not connected: %s", |
1353 | c->self, strerror(err)); | |
1354 | if (compat20) { | |
1355 | packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); | |
1356 | packet_put_int(c->remote_id); | |
1357 | packet_put_int(SSH2_OPEN_CONNECT_FAILED); | |
1358 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { | |
1359 | packet_put_cstring(strerror(err)); | |
1360 | packet_put_cstring(""); | |
1361 | } | |
97fb6912 | 1362 | } else { |
d18e0850 | 1363 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
1364 | packet_put_int(c->remote_id); | |
97fb6912 | 1365 | } |
d18e0850 | 1366 | chan_mark_dead(c); |
97fb6912 | 1367 | } |
d18e0850 | 1368 | packet_send(); |
97fb6912 | 1369 | } |
1370 | } | |
1371 | ||
396c147e | 1372 | static int |
7368a6c8 | 1373 | channel_handle_rfd(Channel *c, fd_set * readset, fd_set * writeset) |
1374 | { | |
fa1d7d85 | 1375 | char buf[CHAN_RBUF]; |
7368a6c8 | 1376 | int len; |
1377 | ||
6fd8622b | 1378 | if (c->rfd != -1 && |
7368a6c8 | 1379 | FD_ISSET(c->rfd, readset)) { |
1380 | len = read(c->rfd, buf, sizeof(buf)); | |
0fbe8c74 | 1381 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
1382 | return 1; | |
7368a6c8 | 1383 | if (len <= 0) { |
d7ac5f18 | 1384 | debug2("channel %d: read<=0 rfd %d len %d", |
7368a6c8 | 1385 | c->self, c->rfd, len); |
28b9cb4d | 1386 | if (c->type != SSH_CHANNEL_OPEN) { |
d7ac5f18 | 1387 | debug2("channel %d: not open", c->self); |
719fc62f | 1388 | chan_mark_dead(c); |
0490e609 | 1389 | return -1; |
28b9cb4d | 1390 | } else if (compat13) { |
9c50edcf | 1391 | buffer_clear(&c->output); |
7368a6c8 | 1392 | c->type = SSH_CHANNEL_INPUT_DRAINING; |
d7ac5f18 | 1393 | debug2("channel %d: input draining.", c->self); |
7368a6c8 | 1394 | } else { |
1395 | chan_read_failed(c); | |
5260325f | 1396 | } |
7368a6c8 | 1397 | return -1; |
1398 | } | |
6aacefa7 | 1399 | if (c->input_filter != NULL) { |
2e73a022 | 1400 | if (c->input_filter(c, buf, len) == -1) { |
d7ac5f18 | 1401 | debug2("channel %d: filter stops", c->self); |
2e73a022 | 1402 | chan_read_failed(c); |
1403 | } | |
1404 | } else { | |
1405 | buffer_append(&c->input, buf, len); | |
1406 | } | |
7368a6c8 | 1407 | } |
1408 | return 1; | |
1409 | } | |
396c147e | 1410 | static int |
7368a6c8 | 1411 | channel_handle_wfd(Channel *c, fd_set * readset, fd_set * writeset) |
1412 | { | |
95ce5599 | 1413 | struct termios tio; |
780a9951 | 1414 | u_char *data; |
1415 | u_int dlen; | |
7368a6c8 | 1416 | int len; |
1417 | ||
1418 | /* Send buffered output data to the socket. */ | |
6fd8622b | 1419 | if (c->wfd != -1 && |
7368a6c8 | 1420 | FD_ISSET(c->wfd, writeset) && |
1421 | buffer_len(&c->output) > 0) { | |
780a9951 | 1422 | data = buffer_ptr(&c->output); |
1423 | dlen = buffer_len(&c->output); | |
64c0ce80 | 1424 | #ifdef _AIX |
aff51935 | 1425 | /* XXX: Later AIX versions can't push as much data to tty */ |
7fbb4189 | 1426 | if (compat20 && c->wfd_isatty) |
1427 | dlen = MIN(dlen, 8*1024); | |
64c0ce80 | 1428 | #endif |
21c2c5cd | 1429 | len = write(c->wfd, data, dlen); |
0fbe8c74 | 1430 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
1431 | return 1; | |
7368a6c8 | 1432 | if (len <= 0) { |
28b9cb4d | 1433 | if (c->type != SSH_CHANNEL_OPEN) { |
d7ac5f18 | 1434 | debug2("channel %d: not open", c->self); |
719fc62f | 1435 | chan_mark_dead(c); |
28b9cb4d | 1436 | return -1; |
1437 | } else if (compat13) { | |
9c50edcf | 1438 | buffer_clear(&c->output); |
d7ac5f18 | 1439 | debug2("channel %d: input draining.", c->self); |
7368a6c8 | 1440 | c->type = SSH_CHANNEL_INPUT_DRAINING; |
1441 | } else { | |
1442 | chan_write_failed(c); | |
5260325f | 1443 | } |
7368a6c8 | 1444 | return -1; |
1445 | } | |
780a9951 | 1446 | if (compat20 && c->isatty && dlen >= 1 && data[0] != '\r') { |
0ae4fe1d | 1447 | if (tcgetattr(c->wfd, &tio) == 0 && |
1448 | !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) { | |
1449 | /* | |
1450 | * Simulate echo to reduce the impact of | |
355724fc | 1451 | * traffic analysis. We need to match the |
95ce5599 | 1452 | * size of a SSH2_MSG_CHANNEL_DATA message |
1453 | * (4 byte channel id + data) | |
0ae4fe1d | 1454 | */ |
95ce5599 | 1455 | packet_send_ignore(4 + len); |
0ae4fe1d | 1456 | packet_send(); |
0ae4fe1d | 1457 | } |
1458 | } | |
7368a6c8 | 1459 | buffer_consume(&c->output, len); |
7e7327a1 | 1460 | if (compat20 && len > 0) { |
1461 | c->local_consumed += len; | |
1462 | } | |
1463 | } | |
1464 | return 1; | |
1465 | } | |
396c147e | 1466 | static int |
7e7327a1 | 1467 | channel_handle_efd(Channel *c, fd_set * readset, fd_set * writeset) |
1468 | { | |
fa1d7d85 | 1469 | char buf[CHAN_RBUF]; |
7e7327a1 | 1470 | int len; |
1471 | ||
8ce64345 | 1472 | /** XXX handle drain efd, too */ |
7e7327a1 | 1473 | if (c->efd != -1) { |
1474 | if (c->extended_usage == CHAN_EXTENDED_WRITE && | |
1475 | FD_ISSET(c->efd, writeset) && | |
1476 | buffer_len(&c->extended) > 0) { | |
1477 | len = write(c->efd, buffer_ptr(&c->extended), | |
1478 | buffer_len(&c->extended)); | |
de273eef | 1479 | debug2("channel %d: written %d to efd %d", |
7e7327a1 | 1480 | c->self, len, c->efd); |
ee55dacf | 1481 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
1482 | return 1; | |
1483 | if (len <= 0) { | |
1484 | debug2("channel %d: closing write-efd %d", | |
1485 | c->self, c->efd); | |
489aa2e9 | 1486 | channel_close_fd(&c->efd); |
ee55dacf | 1487 | } else { |
7e7327a1 | 1488 | buffer_consume(&c->extended, len); |
1489 | c->local_consumed += len; | |
1490 | } | |
1491 | } else if (c->extended_usage == CHAN_EXTENDED_READ && | |
1492 | FD_ISSET(c->efd, readset)) { | |
1493 | len = read(c->efd, buf, sizeof(buf)); | |
de273eef | 1494 | debug2("channel %d: read %d from efd %d", |
184eed6a | 1495 | c->self, len, c->efd); |
ee55dacf | 1496 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
1497 | return 1; | |
1498 | if (len <= 0) { | |
1499 | debug2("channel %d: closing read-efd %d", | |
8ce64345 | 1500 | c->self, c->efd); |
489aa2e9 | 1501 | channel_close_fd(&c->efd); |
ee55dacf | 1502 | } else { |
7e7327a1 | 1503 | buffer_append(&c->extended, buf, len); |
ee55dacf | 1504 | } |
7e7327a1 | 1505 | } |
1506 | } | |
1507 | return 1; | |
1508 | } | |
396c147e | 1509 | static int |
5e96b616 | 1510 | channel_handle_ctl(Channel *c, fd_set * readset, fd_set * writeset) |
1511 | { | |
1512 | char buf[16]; | |
1513 | int len; | |
1514 | ||
1515 | /* Monitor control fd to detect if the slave client exits */ | |
1516 | if (c->ctl_fd != -1 && FD_ISSET(c->ctl_fd, readset)) { | |
1517 | len = read(c->ctl_fd, buf, sizeof(buf)); | |
1518 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) | |
1519 | return 1; | |
1520 | if (len <= 0) { | |
1521 | debug2("channel %d: ctl read<=0", c->self); | |
1522 | if (c->type != SSH_CHANNEL_OPEN) { | |
1523 | debug2("channel %d: not open", c->self); | |
1524 | chan_mark_dead(c); | |
1525 | return -1; | |
1526 | } else { | |
1527 | chan_read_failed(c); | |
1528 | chan_write_failed(c); | |
1529 | } | |
1530 | return -1; | |
1531 | } else | |
1532 | fatal("%s: unexpected data on ctl fd", __func__); | |
1533 | } | |
1534 | return 1; | |
1535 | } | |
1536 | static int | |
ee55dacf | 1537 | channel_check_window(Channel *c) |
7e7327a1 | 1538 | { |
28b9cb4d | 1539 | if (c->type == SSH_CHANNEL_OPEN && |
1540 | !(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) && | |
7e7327a1 | 1541 | c->local_window < c->local_window_max/2 && |
1542 | c->local_consumed > 0) { | |
1543 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); | |
1544 | packet_put_int(c->remote_id); | |
1545 | packet_put_int(c->local_consumed); | |
1546 | packet_send(); | |
de273eef | 1547 | debug2("channel %d: window %d sent adjust %d", |
7e7327a1 | 1548 | c->self, c->local_window, |
1549 | c->local_consumed); | |
1550 | c->local_window += c->local_consumed; | |
1551 | c->local_consumed = 0; | |
7368a6c8 | 1552 | } |
1553 | return 1; | |
1554 | } | |
5260325f | 1555 | |
396c147e | 1556 | static void |
0c0738d5 | 1557 | channel_post_open(Channel *c, fd_set * readset, fd_set * writeset) |
7368a6c8 | 1558 | { |
639cb8ab | 1559 | if (c->delayed) |
1560 | return; | |
7368a6c8 | 1561 | channel_handle_rfd(c, readset, writeset); |
1562 | channel_handle_wfd(c, readset, writeset); | |
0c0738d5 | 1563 | if (!compat20) |
639cb8ab | 1564 | return; |
7e7327a1 | 1565 | channel_handle_efd(c, readset, writeset); |
5e96b616 | 1566 | channel_handle_ctl(c, readset, writeset); |
ee55dacf | 1567 | channel_check_window(c); |
7e7327a1 | 1568 | } |
1569 | ||
396c147e | 1570 | static void |
7368a6c8 | 1571 | channel_post_output_drain_13(Channel *c, fd_set * readset, fd_set * writeset) |
1572 | { | |
1573 | int len; | |
e1feb9bf | 1574 | |
7368a6c8 | 1575 | /* Send buffered output data to the socket. */ |
1576 | if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) { | |
1577 | len = write(c->sock, buffer_ptr(&c->output), | |
1578 | buffer_len(&c->output)); | |
1579 | if (len <= 0) | |
9c50edcf | 1580 | buffer_clear(&c->output); |
7368a6c8 | 1581 | else |
1582 | buffer_consume(&c->output, len); | |
1583 | } | |
1584 | } | |
5260325f | 1585 | |
396c147e | 1586 | static void |
7e7327a1 | 1587 | channel_handler_init_20(void) |
1588 | { | |
0c0738d5 | 1589 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open; |
0b242b12 | 1590 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
7e7327a1 | 1591 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; |
fa08c86b | 1592 | channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener; |
0b242b12 | 1593 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
fa08c86b | 1594 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; |
97fb6912 | 1595 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1596 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7e7327a1 | 1597 | |
0c0738d5 | 1598 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
7e7327a1 | 1599 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; |
fa08c86b | 1600 | channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener; |
0b242b12 | 1601 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
fa08c86b | 1602 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; |
97fb6912 | 1603 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 1604 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
7e7327a1 | 1605 | } |
1606 | ||
396c147e | 1607 | static void |
7368a6c8 | 1608 | channel_handler_init_13(void) |
1609 | { | |
1610 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13; | |
1611 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_13; | |
1612 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; | |
1613 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; | |
1614 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; | |
1615 | channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining; | |
1616 | channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining; | |
97fb6912 | 1617 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1618 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7368a6c8 | 1619 | |
0c0738d5 | 1620 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
7368a6c8 | 1621 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
1622 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; | |
1623 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; | |
1624 | channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13; | |
97fb6912 | 1625 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 1626 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
7368a6c8 | 1627 | } |
5260325f | 1628 | |
396c147e | 1629 | static void |
7368a6c8 | 1630 | channel_handler_init_15(void) |
1631 | { | |
0c0738d5 | 1632 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open; |
0b242b12 | 1633 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
7368a6c8 | 1634 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
1635 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; | |
1636 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; | |
97fb6912 | 1637 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1638 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7368a6c8 | 1639 | |
1640 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; | |
1641 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; | |
1642 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; | |
0c0738d5 | 1643 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
97fb6912 | 1644 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 1645 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
7368a6c8 | 1646 | } |
1647 | ||
396c147e | 1648 | static void |
7368a6c8 | 1649 | channel_handler_init(void) |
1650 | { | |
1651 | int i; | |
e1feb9bf | 1652 | |
184eed6a | 1653 | for (i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) { |
7368a6c8 | 1654 | channel_pre[i] = NULL; |
1655 | channel_post[i] = NULL; | |
1656 | } | |
7e7327a1 | 1657 | if (compat20) |
1658 | channel_handler_init_20(); | |
1659 | else if (compat13) | |
7368a6c8 | 1660 | channel_handler_init_13(); |
1661 | else | |
1662 | channel_handler_init_15(); | |
1663 | } | |
1664 | ||
418e724c | 1665 | /* gc dead channels */ |
1666 | static void | |
1667 | channel_garbage_collect(Channel *c) | |
1668 | { | |
1669 | if (c == NULL) | |
1670 | return; | |
1671 | if (c->detach_user != NULL) { | |
8cd0437d | 1672 | if (!chan_is_dead(c, c->detach_close)) |
418e724c | 1673 | return; |
d7ac5f18 | 1674 | debug2("channel %d: gc: notify user", c->self); |
418e724c | 1675 | c->detach_user(c->self, NULL); |
1676 | /* if we still have a callback */ | |
1677 | if (c->detach_user != NULL) | |
1678 | return; | |
d7ac5f18 | 1679 | debug2("channel %d: gc: user detached", c->self); |
418e724c | 1680 | } |
1681 | if (!chan_is_dead(c, 1)) | |
1682 | return; | |
d7ac5f18 | 1683 | debug2("channel %d: garbage collecting", c->self); |
418e724c | 1684 | channel_free(c); |
1685 | } | |
1686 | ||
396c147e | 1687 | static void |
7368a6c8 | 1688 | channel_handler(chan_fn *ftab[], fd_set * readset, fd_set * writeset) |
1689 | { | |
1690 | static int did_init = 0; | |
9a995072 | 1691 | u_int i; |
7368a6c8 | 1692 | Channel *c; |
1693 | ||
1694 | if (!did_init) { | |
1695 | channel_handler_init(); | |
1696 | did_init = 1; | |
1697 | } | |
1698 | for (i = 0; i < channels_alloc; i++) { | |
719fc62f | 1699 | c = channels[i]; |
1700 | if (c == NULL) | |
5260325f | 1701 | continue; |
6fd8622b | 1702 | if (ftab[c->type] != NULL) |
1703 | (*ftab[c->type])(c, readset, writeset); | |
418e724c | 1704 | channel_garbage_collect(c); |
8efc0c15 | 1705 | } |
8efc0c15 | 1706 | } |
1707 | ||
8e7895b8 | 1708 | /* |
1709 | * Allocate/update select bitmasks and add any bits relevant to channels in | |
1710 | * select bitmasks. | |
1711 | */ | |
6ae2364d | 1712 | void |
c422989b | 1713 | channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp, |
9a995072 | 1714 | u_int *nallocp, int rekeying) |
7368a6c8 | 1715 | { |
9a995072 | 1716 | u_int n, sz; |
39929cdb | 1717 | |
1718 | n = MAX(*maxfdp, channel_max_fd); | |
1719 | ||
1720 | sz = howmany(n+1, NFDBITS) * sizeof(fd_mask); | |
489aa2e9 | 1721 | /* perhaps check sz < nalloc/2 and shrink? */ |
1722 | if (*readsetp == NULL || sz > *nallocp) { | |
1723 | *readsetp = xrealloc(*readsetp, sz); | |
1724 | *writesetp = xrealloc(*writesetp, sz); | |
1725 | *nallocp = sz; | |
39929cdb | 1726 | } |
489aa2e9 | 1727 | *maxfdp = n; |
39929cdb | 1728 | memset(*readsetp, 0, sz); |
1729 | memset(*writesetp, 0, sz); | |
1730 | ||
c422989b | 1731 | if (!rekeying) |
1732 | channel_handler(channel_pre, *readsetp, *writesetp); | |
7368a6c8 | 1733 | } |
1734 | ||
8e7895b8 | 1735 | /* |
1736 | * After select, perform any appropriate operations for channels which have | |
1737 | * events pending. | |
1738 | */ | |
6ae2364d | 1739 | void |
7368a6c8 | 1740 | channel_after_select(fd_set * readset, fd_set * writeset) |
1741 | { | |
1742 | channel_handler(channel_post, readset, writeset); | |
1743 | } | |
1744 | ||
8e7895b8 | 1745 | |
39929cdb | 1746 | /* If there is data to send to the connection, enqueue some of it now. */ |
8efc0c15 | 1747 | |
6ae2364d | 1748 | void |
d5bb9418 | 1749 | channel_output_poll(void) |
8efc0c15 | 1750 | { |
7368a6c8 | 1751 | Channel *c; |
9a995072 | 1752 | u_int i, len; |
5260325f | 1753 | |
1754 | for (i = 0; i < channels_alloc; i++) { | |
719fc62f | 1755 | c = channels[i]; |
1756 | if (c == NULL) | |
1757 | continue; | |
48e671d5 | 1758 | |
8e7895b8 | 1759 | /* |
1760 | * We are only interested in channels that can have buffered | |
1761 | * incoming data. | |
1762 | */ | |
48e671d5 | 1763 | if (compat13) { |
7368a6c8 | 1764 | if (c->type != SSH_CHANNEL_OPEN && |
1765 | c->type != SSH_CHANNEL_INPUT_DRAINING) | |
48e671d5 | 1766 | continue; |
1767 | } else { | |
7368a6c8 | 1768 | if (c->type != SSH_CHANNEL_OPEN) |
48e671d5 | 1769 | continue; |
48e671d5 | 1770 | } |
e78a59f5 | 1771 | if (compat20 && |
1772 | (c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) { | |
ee55dacf | 1773 | /* XXX is this true? */ |
418e724c | 1774 | debug3("channel %d: will not send data after close", c->self); |
7e7327a1 | 1775 | continue; |
1776 | } | |
5260325f | 1777 | |
1778 | /* Get the amount of buffered data for this channel. */ | |
ee55dacf | 1779 | if ((c->istate == CHAN_INPUT_OPEN || |
1780 | c->istate == CHAN_INPUT_WAIT_DRAIN) && | |
1781 | (len = buffer_len(&c->input)) > 0) { | |
8e7895b8 | 1782 | /* |
1783 | * Send some data for the other side over the secure | |
1784 | * connection. | |
1785 | */ | |
7e7327a1 | 1786 | if (compat20) { |
1787 | if (len > c->remote_window) | |
1788 | len = c->remote_window; | |
1789 | if (len > c->remote_maxpacket) | |
1790 | len = c->remote_maxpacket; | |
5260325f | 1791 | } else { |
7e7327a1 | 1792 | if (packet_is_interactive()) { |
1793 | if (len > 1024) | |
1794 | len = 512; | |
1795 | } else { | |
1796 | /* Keep the packets at reasonable size. */ | |
1797 | if (len > packet_get_maxsize()/2) | |
1798 | len = packet_get_maxsize()/2; | |
1799 | } | |
5260325f | 1800 | } |
7368a6c8 | 1801 | if (len > 0) { |
7e7327a1 | 1802 | packet_start(compat20 ? |
1803 | SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA); | |
7368a6c8 | 1804 | packet_put_int(c->remote_id); |
1805 | packet_put_string(buffer_ptr(&c->input), len); | |
1806 | packet_send(); | |
1807 | buffer_consume(&c->input, len); | |
1808 | c->remote_window -= len; | |
7368a6c8 | 1809 | } |
1810 | } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) { | |
5260325f | 1811 | if (compat13) |
1812 | fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3"); | |
aa3378df | 1813 | /* |
1814 | * input-buffer is empty and read-socket shutdown: | |
d2296ed7 | 1815 | * tell peer, that we will not send more data: send IEOF. |
1816 | * hack for extended data: delay EOF if EFD still in use. | |
aa3378df | 1817 | */ |
d2296ed7 | 1818 | if (CHANNEL_EFD_INPUT_ACTIVE(c)) |
4e2e5cfd | 1819 | debug2("channel %d: ibuf_empty delayed efd %d/(%d)", |
1820 | c->self, c->efd, buffer_len(&c->extended)); | |
d2296ed7 | 1821 | else |
1822 | chan_ibuf_empty(c); | |
5260325f | 1823 | } |
7e7327a1 | 1824 | /* Send extended data, i.e. stderr */ |
1825 | if (compat20 && | |
d2296ed7 | 1826 | !(c->flags & CHAN_EOF_SENT) && |
7e7327a1 | 1827 | c->remote_window > 0 && |
1828 | (len = buffer_len(&c->extended)) > 0 && | |
1829 | c->extended_usage == CHAN_EXTENDED_READ) { | |
f91d9a89 | 1830 | debug2("channel %d: rwin %u elen %u euse %d", |
ee55dacf | 1831 | c->self, c->remote_window, buffer_len(&c->extended), |
1832 | c->extended_usage); | |
7e7327a1 | 1833 | if (len > c->remote_window) |
1834 | len = c->remote_window; | |
1835 | if (len > c->remote_maxpacket) | |
1836 | len = c->remote_maxpacket; | |
1837 | packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA); | |
1838 | packet_put_int(c->remote_id); | |
1839 | packet_put_int(SSH2_EXTENDED_DATA_STDERR); | |
1840 | packet_put_string(buffer_ptr(&c->extended), len); | |
1841 | packet_send(); | |
1842 | buffer_consume(&c->extended, len); | |
1843 | c->remote_window -= len; | |
ee55dacf | 1844 | debug2("channel %d: sent ext data %d", c->self, len); |
7e7327a1 | 1845 | } |
8efc0c15 | 1846 | } |
8efc0c15 | 1847 | } |
1848 | ||
8e7895b8 | 1849 | |
1850 | /* -- protocol input */ | |
8efc0c15 | 1851 | |
6ae2364d | 1852 | void |
7819b5c3 | 1853 | channel_input_data(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 1854 | { |
48e671d5 | 1855 | int id; |
5260325f | 1856 | char *data; |
1e3b8b07 | 1857 | u_int data_len; |
7368a6c8 | 1858 | Channel *c; |
5260325f | 1859 | |
1860 | /* Get the channel number and verify it. */ | |
48e671d5 | 1861 | id = packet_get_int(); |
7368a6c8 | 1862 | c = channel_lookup(id); |
1863 | if (c == NULL) | |
48e671d5 | 1864 | packet_disconnect("Received data for nonexistent channel %d.", id); |
5260325f | 1865 | |
1866 | /* Ignore any data for non-open channels (might happen on close) */ | |
7368a6c8 | 1867 | if (c->type != SSH_CHANNEL_OPEN && |
1868 | c->type != SSH_CHANNEL_X11_OPEN) | |
48e671d5 | 1869 | return; |
1870 | ||
5260325f | 1871 | /* Get the data. */ |
1872 | data = packet_get_string(&data_len); | |
7368a6c8 | 1873 | |
7741e239 | 1874 | /* |
1875 | * Ignore data for protocol > 1.3 if output end is no longer open. | |
1876 | * For protocol 2 the sending side is reducing its window as it sends | |
1877 | * data, so we must 'fake' consumption of the data in order to ensure | |
1878 | * that window updates are sent back. Otherwise the connection might | |
1879 | * deadlock. | |
1880 | */ | |
1881 | if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN) { | |
1882 | if (compat20) { | |
1883 | c->local_window -= data_len; | |
1884 | c->local_consumed += data_len; | |
1885 | } | |
1886 | xfree(data); | |
1887 | return; | |
1888 | } | |
1889 | ||
6aacefa7 | 1890 | if (compat20) { |
7e7327a1 | 1891 | if (data_len > c->local_maxpacket) { |
bbe88b6d | 1892 | logit("channel %d: rcvd big packet %d, maxpack %d", |
7e7327a1 | 1893 | c->self, data_len, c->local_maxpacket); |
1894 | } | |
1895 | if (data_len > c->local_window) { | |
bbe88b6d | 1896 | logit("channel %d: rcvd too much data %d, win %d", |
7e7327a1 | 1897 | c->self, data_len, c->local_window); |
1898 | xfree(data); | |
1899 | return; | |
1900 | } | |
1901 | c->local_window -= data_len; | |
7e7327a1 | 1902 | } |
95500969 | 1903 | packet_check_eom(); |
7368a6c8 | 1904 | buffer_append(&c->output, data, data_len); |
5260325f | 1905 | xfree(data); |
8efc0c15 | 1906 | } |
8e7895b8 | 1907 | |
6ae2364d | 1908 | void |
7819b5c3 | 1909 | channel_input_extended_data(int type, u_int32_t seq, void *ctxt) |
7e7327a1 | 1910 | { |
1911 | int id; | |
7e7327a1 | 1912 | char *data; |
a594fa74 | 1913 | u_int data_len, tcode; |
7e7327a1 | 1914 | Channel *c; |
1915 | ||
1916 | /* Get the channel number and verify it. */ | |
1917 | id = packet_get_int(); | |
1918 | c = channel_lookup(id); | |
1919 | ||
1920 | if (c == NULL) | |
1921 | packet_disconnect("Received extended_data for bad channel %d.", id); | |
1922 | if (c->type != SSH_CHANNEL_OPEN) { | |
bbe88b6d | 1923 | logit("channel %d: ext data for non open", id); |
7e7327a1 | 1924 | return; |
1925 | } | |
d2296ed7 | 1926 | if (c->flags & CHAN_EOF_RCVD) { |
1927 | if (datafellows & SSH_BUG_EXTEOF) | |
1928 | debug("channel %d: accepting ext data after eof", id); | |
1929 | else | |
1930 | packet_disconnect("Received extended_data after EOF " | |
1931 | "on channel %d.", id); | |
1932 | } | |
7e7327a1 | 1933 | tcode = packet_get_int(); |
1934 | if (c->efd == -1 || | |
1935 | c->extended_usage != CHAN_EXTENDED_WRITE || | |
1936 | tcode != SSH2_EXTENDED_DATA_STDERR) { | |
bbe88b6d | 1937 | logit("channel %d: bad ext data", c->self); |
7e7327a1 | 1938 | return; |
1939 | } | |
1940 | data = packet_get_string(&data_len); | |
95500969 | 1941 | packet_check_eom(); |
7e7327a1 | 1942 | if (data_len > c->local_window) { |
bbe88b6d | 1943 | logit("channel %d: rcvd too much extended_data %d, win %d", |
7e7327a1 | 1944 | c->self, data_len, c->local_window); |
1945 | xfree(data); | |
1946 | return; | |
1947 | } | |
de273eef | 1948 | debug2("channel %d: rcvd ext data %d", c->self, data_len); |
7e7327a1 | 1949 | c->local_window -= data_len; |
1950 | buffer_append(&c->extended, data, data_len); | |
1951 | xfree(data); | |
1952 | } | |
1953 | ||
6ae2364d | 1954 | void |
7819b5c3 | 1955 | channel_input_ieof(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 1956 | { |
1957 | int id; | |
1958 | Channel *c; | |
1959 | ||
7368a6c8 | 1960 | id = packet_get_int(); |
95500969 | 1961 | packet_check_eom(); |
7368a6c8 | 1962 | c = channel_lookup(id); |
1963 | if (c == NULL) | |
1964 | packet_disconnect("Received ieof for nonexistent channel %d.", id); | |
1965 | chan_rcvd_ieof(c); | |
a5f82435 | 1966 | |
1967 | /* XXX force input close */ | |
8341f420 | 1968 | if (c->force_drain && c->istate == CHAN_INPUT_OPEN) { |
a5f82435 | 1969 | debug("channel %d: FORCE input drain", c->self); |
1970 | c->istate = CHAN_INPUT_WAIT_DRAIN; | |
32e7d71f | 1971 | if (buffer_len(&c->input) == 0) |
1972 | chan_ibuf_empty(c); | |
a5f82435 | 1973 | } |
1974 | ||
7368a6c8 | 1975 | } |
8efc0c15 | 1976 | |
6ae2364d | 1977 | void |
7819b5c3 | 1978 | channel_input_close(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 1979 | { |
7368a6c8 | 1980 | int id; |
1981 | Channel *c; | |
5260325f | 1982 | |
7368a6c8 | 1983 | id = packet_get_int(); |
95500969 | 1984 | packet_check_eom(); |
7368a6c8 | 1985 | c = channel_lookup(id); |
1986 | if (c == NULL) | |
1987 | packet_disconnect("Received close for nonexistent channel %d.", id); | |
aa3378df | 1988 | |
1989 | /* | |
1990 | * Send a confirmation that we have closed the channel and no more | |
1991 | * data is coming for it. | |
1992 | */ | |
5260325f | 1993 | packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION); |
7368a6c8 | 1994 | packet_put_int(c->remote_id); |
5260325f | 1995 | packet_send(); |
1996 | ||
aa3378df | 1997 | /* |
1998 | * If the channel is in closed state, we have sent a close request, | |
1999 | * and the other side will eventually respond with a confirmation. | |
2000 | * Thus, we cannot free the channel here, because then there would be | |
2001 | * no-one to receive the confirmation. The channel gets freed when | |
2002 | * the confirmation arrives. | |
2003 | */ | |
7368a6c8 | 2004 | if (c->type != SSH_CHANNEL_CLOSED) { |
aa3378df | 2005 | /* |
2006 | * Not a closed channel - mark it as draining, which will | |
2007 | * cause it to be freed later. | |
2008 | */ | |
9c50edcf | 2009 | buffer_clear(&c->input); |
7368a6c8 | 2010 | c->type = SSH_CHANNEL_OUTPUT_DRAINING; |
5260325f | 2011 | } |
8efc0c15 | 2012 | } |
2013 | ||
7368a6c8 | 2014 | /* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */ |
6ae2364d | 2015 | void |
7819b5c3 | 2016 | channel_input_oclose(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2017 | { |
7368a6c8 | 2018 | int id = packet_get_int(); |
2019 | Channel *c = channel_lookup(id); | |
a8a21a53 | 2020 | |
95500969 | 2021 | packet_check_eom(); |
7368a6c8 | 2022 | if (c == NULL) |
2023 | packet_disconnect("Received oclose for nonexistent channel %d.", id); | |
2024 | chan_rcvd_oclose(c); | |
8efc0c15 | 2025 | } |
2026 | ||
6ae2364d | 2027 | void |
7819b5c3 | 2028 | channel_input_close_confirmation(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 2029 | { |
2030 | int id = packet_get_int(); | |
2031 | Channel *c = channel_lookup(id); | |
2032 | ||
95500969 | 2033 | packet_check_eom(); |
7368a6c8 | 2034 | if (c == NULL) |
2035 | packet_disconnect("Received close confirmation for " | |
2036 | "out-of-range channel %d.", id); | |
2037 | if (c->type != SSH_CHANNEL_CLOSED) | |
2038 | packet_disconnect("Received close confirmation for " | |
2039 | "non-closed channel %d (type %d).", id, c->type); | |
719fc62f | 2040 | channel_free(c); |
7368a6c8 | 2041 | } |
8efc0c15 | 2042 | |
6ae2364d | 2043 | void |
7819b5c3 | 2044 | channel_input_open_confirmation(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2045 | { |
7368a6c8 | 2046 | int id, remote_id; |
2047 | Channel *c; | |
5260325f | 2048 | |
7368a6c8 | 2049 | id = packet_get_int(); |
2050 | c = channel_lookup(id); | |
5260325f | 2051 | |
7368a6c8 | 2052 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) |
2053 | packet_disconnect("Received open confirmation for " | |
2054 | "non-opening channel %d.", id); | |
2055 | remote_id = packet_get_int(); | |
aa3378df | 2056 | /* Record the remote channel number and mark that the channel is now open. */ |
7368a6c8 | 2057 | c->remote_id = remote_id; |
2058 | c->type = SSH_CHANNEL_OPEN; | |
7e7327a1 | 2059 | |
2060 | if (compat20) { | |
2061 | c->remote_window = packet_get_int(); | |
2062 | c->remote_maxpacket = packet_get_int(); | |
05ca0898 | 2063 | if (c->confirm) { |
de273eef | 2064 | debug2("callback start"); |
5e96b616 | 2065 | c->confirm(c->self, c->confirm_ctx); |
de273eef | 2066 | debug2("callback done"); |
7e7327a1 | 2067 | } |
d7ac5f18 | 2068 | debug2("channel %d: open confirm rwindow %u rmax %u", c->self, |
7e7327a1 | 2069 | c->remote_window, c->remote_maxpacket); |
2070 | } | |
95500969 | 2071 | packet_check_eom(); |
8efc0c15 | 2072 | } |
2073 | ||
396c147e | 2074 | static char * |
d18e0850 | 2075 | reason2txt(int reason) |
2076 | { | |
6aacefa7 | 2077 | switch (reason) { |
d18e0850 | 2078 | case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED: |
2079 | return "administratively prohibited"; | |
2080 | case SSH2_OPEN_CONNECT_FAILED: | |
2081 | return "connect failed"; | |
2082 | case SSH2_OPEN_UNKNOWN_CHANNEL_TYPE: | |
2083 | return "unknown channel type"; | |
2084 | case SSH2_OPEN_RESOURCE_SHORTAGE: | |
2085 | return "resource shortage"; | |
2086 | } | |
7e8c18e9 | 2087 | return "unknown reason"; |
d18e0850 | 2088 | } |
2089 | ||
6ae2364d | 2090 | void |
7819b5c3 | 2091 | channel_input_open_failure(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2092 | { |
02a024dd | 2093 | int id, reason; |
2094 | char *msg = NULL, *lang = NULL; | |
7368a6c8 | 2095 | Channel *c; |
5260325f | 2096 | |
7368a6c8 | 2097 | id = packet_get_int(); |
2098 | c = channel_lookup(id); | |
2099 | ||
2100 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) | |
2101 | packet_disconnect("Received open failure for " | |
2102 | "non-opening channel %d.", id); | |
7e7327a1 | 2103 | if (compat20) { |
02a024dd | 2104 | reason = packet_get_int(); |
fbe90f7b | 2105 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { |
02a024dd | 2106 | msg = packet_get_string(NULL); |
2107 | lang = packet_get_string(NULL); | |
2108 | } | |
bbe88b6d | 2109 | logit("channel %d: open failed: %s%s%s", id, |
d18e0850 | 2110 | reason2txt(reason), msg ? ": ": "", msg ? msg : ""); |
02a024dd | 2111 | if (msg != NULL) |
2112 | xfree(msg); | |
2113 | if (lang != NULL) | |
2114 | xfree(lang); | |
7e7327a1 | 2115 | } |
95500969 | 2116 | packet_check_eom(); |
5260325f | 2117 | /* Free the channel. This will also close the socket. */ |
719fc62f | 2118 | channel_free(c); |
8efc0c15 | 2119 | } |
2120 | ||
8e7895b8 | 2121 | void |
7819b5c3 | 2122 | channel_input_window_adjust(int type, u_int32_t seq, void *ctxt) |
8e7895b8 | 2123 | { |
2124 | Channel *c; | |
f91d9a89 | 2125 | int id; |
2126 | u_int adjust; | |
3ffc6336 | 2127 | |
8e7895b8 | 2128 | if (!compat20) |
2129 | return; | |
8efc0c15 | 2130 | |
8e7895b8 | 2131 | /* Get the channel number and verify it. */ |
2132 | id = packet_get_int(); | |
2133 | c = channel_lookup(id); | |
2134 | ||
2135 | if (c == NULL || c->type != SSH_CHANNEL_OPEN) { | |
bbe88b6d | 2136 | logit("Received window adjust for " |
8e7895b8 | 2137 | "non-open channel %d.", id); |
2138 | return; | |
2139 | } | |
2140 | adjust = packet_get_int(); | |
95500969 | 2141 | packet_check_eom(); |
f91d9a89 | 2142 | debug2("channel %d: rcvd adjust %u", id, adjust); |
8e7895b8 | 2143 | c->remote_window += adjust; |
2144 | } | |
2145 | ||
2146 | void | |
7819b5c3 | 2147 | channel_input_port_open(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2148 | { |
8e7895b8 | 2149 | Channel *c = NULL; |
2150 | u_short host_port; | |
2151 | char *host, *originator_string; | |
2152 | int remote_id, sock = -1; | |
5260325f | 2153 | |
8e7895b8 | 2154 | remote_id = packet_get_int(); |
2155 | host = packet_get_string(NULL); | |
2156 | host_port = packet_get_int(); | |
2157 | ||
2158 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) { | |
2159 | originator_string = packet_get_string(NULL); | |
2160 | } else { | |
2161 | originator_string = xstrdup("unknown (remote did not supply name)"); | |
2162 | } | |
95500969 | 2163 | packet_check_eom(); |
8e7895b8 | 2164 | sock = channel_connect_to(host, host_port); |
2165 | if (sock != -1) { | |
2166 | c = channel_new("connected socket", | |
2167 | SSH_CHANNEL_CONNECTING, sock, sock, -1, 0, 0, 0, | |
2168 | originator_string, 1); | |
3a0d3d54 | 2169 | c->remote_id = remote_id; |
5260325f | 2170 | } |
0d942eff | 2171 | xfree(originator_string); |
8e7895b8 | 2172 | if (c == NULL) { |
2173 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
2174 | packet_put_int(remote_id); | |
2175 | packet_send(); | |
2176 | } | |
2177 | xfree(host); | |
8efc0c15 | 2178 | } |
2179 | ||
8e7895b8 | 2180 | |
2181 | /* -- tcp forwarding */ | |
2182 | ||
5e4a7219 | 2183 | void |
2184 | channel_set_af(int af) | |
2185 | { | |
2186 | IPv4or6 = af; | |
2187 | } | |
2188 | ||
5641aefa | 2189 | static int |
2190 | channel_setup_fwd_listener(int type, const char *listen_addr, u_short listen_port, | |
2191 | const char *host_to_connect, u_short port_to_connect, int gateway_ports) | |
8efc0c15 | 2192 | { |
719fc62f | 2193 | Channel *c; |
3867aa0a | 2194 | int sock, r, success = 0, on = 1, wildcard = 0, is_client; |
48e671d5 | 2195 | struct addrinfo hints, *ai, *aitop; |
3867aa0a | 2196 | const char *host, *addr; |
5641aefa | 2197 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
5260325f | 2198 | |
5641aefa | 2199 | host = (type == SSH_CHANNEL_RPORT_LISTENER) ? |
2200 | listen_addr : host_to_connect; | |
3867aa0a | 2201 | is_client = (type == SSH_CHANNEL_PORT_LISTENER); |
02a024dd | 2202 | |
5641aefa | 2203 | if (host == NULL) { |
2204 | error("No forward host name."); | |
38946c65 | 2205 | return 0; |
fa08c86b | 2206 | } |
719fc62f | 2207 | if (strlen(host) > SSH_CHANNEL_PATH_LEN - 1) { |
02a024dd | 2208 | error("Forward host name too long."); |
38946c65 | 2209 | return 0; |
02a024dd | 2210 | } |
5260325f | 2211 | |
3867aa0a | 2212 | /* |
2213 | * Determine whether or not a port forward listens to loopback, | |
f8cc7664 | 2214 | * specified address or wildcard. On the client, a specified bind |
2215 | * address will always override gateway_ports. On the server, a | |
2216 | * gateway_ports of 1 (``yes'') will override the client's | |
2217 | * specification and force a wildcard bind, whereas a value of 2 | |
2218 | * (``clientspecified'') will bind to whatever address the client | |
3867aa0a | 2219 | * asked for. |
2220 | * | |
2221 | * Special-case listen_addrs are: | |
2222 | * | |
2223 | * "0.0.0.0" -> wildcard v4/v6 if SSH_OLD_FORWARD_ADDR | |
2224 | * "" (empty string), "*" -> wildcard v4/v6 | |
2225 | * "localhost" -> loopback v4/v6 | |
2226 | */ | |
2227 | addr = NULL; | |
2228 | if (listen_addr == NULL) { | |
2229 | /* No address specified: default to gateway_ports setting */ | |
2230 | if (gateway_ports) | |
2231 | wildcard = 1; | |
2232 | } else if (gateway_ports || is_client) { | |
2233 | if (((datafellows & SSH_OLD_FORWARD_ADDR) && | |
2234 | strcmp(listen_addr, "0.0.0.0") == 0) || | |
2235 | *listen_addr == '\0' || strcmp(listen_addr, "*") == 0 || | |
2236 | (!is_client && gateway_ports == 1)) | |
2237 | wildcard = 1; | |
2238 | else if (strcmp(listen_addr, "localhost") != 0) | |
2239 | addr = listen_addr; | |
2240 | } | |
2241 | ||
2242 | debug3("channel_setup_fwd_listener: type %d wildcard %d addr %s", | |
2243 | type, wildcard, (addr == NULL) ? "NULL" : addr); | |
2244 | ||
aa3378df | 2245 | /* |
48e671d5 | 2246 | * getaddrinfo returns a loopback address if the hostname is |
2247 | * set to NULL and hints.ai_flags is not AI_PASSIVE | |
aa3378df | 2248 | */ |
48e671d5 | 2249 | memset(&hints, 0, sizeof(hints)); |
2250 | hints.ai_family = IPv4or6; | |
3867aa0a | 2251 | hints.ai_flags = wildcard ? AI_PASSIVE : 0; |
48e671d5 | 2252 | hints.ai_socktype = SOCK_STREAM; |
fa08c86b | 2253 | snprintf(strport, sizeof strport, "%d", listen_port); |
3867aa0a | 2254 | if ((r = getaddrinfo(addr, strport, &hints, &aitop)) != 0) { |
2255 | if (addr == NULL) { | |
2256 | /* This really shouldn't happen */ | |
2257 | packet_disconnect("getaddrinfo: fatal error: %s", | |
2258 | gai_strerror(r)); | |
2259 | } else { | |
38946c65 | 2260 | error("channel_setup_fwd_listener: " |
3867aa0a | 2261 | "getaddrinfo(%.64s): %s", addr, gai_strerror(r)); |
2262 | } | |
38946c65 | 2263 | return 0; |
3867aa0a | 2264 | } |
48e671d5 | 2265 | |
48e671d5 | 2266 | for (ai = aitop; ai; ai = ai->ai_next) { |
2267 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
2268 | continue; | |
2269 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), | |
2270 | strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { | |
5641aefa | 2271 | error("channel_setup_fwd_listener: getnameinfo failed"); |
48e671d5 | 2272 | continue; |
2273 | } | |
2274 | /* Create a port to listen for the host. */ | |
3e131a6d | 2275 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
48e671d5 | 2276 | if (sock < 0) { |
2277 | /* this is no error since kernel may not support ipv6 */ | |
2278 | verbose("socket: %.100s", strerror(errno)); | |
2279 | continue; | |
2280 | } | |
2281 | /* | |
facfd613 | 2282 | * Set socket options. |
2283 | * Allow local port reuse in TIME_WAIT. | |
48e671d5 | 2284 | */ |
facfd613 | 2285 | if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &on, |
2286 | sizeof(on)) == -1) | |
2287 | error("setsockopt SO_REUSEADDR: %s", strerror(errno)); | |
2288 | ||
48e671d5 | 2289 | debug("Local forwarding listening on %s port %s.", ntop, strport); |
2290 | ||
2291 | /* Bind the socket to the address. */ | |
2292 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { | |
2293 | /* address can be in use ipv6 address is already bound */ | |
16218745 | 2294 | if (!ai->ai_next) |
2295 | error("bind: %.100s", strerror(errno)); | |
2296 | else | |
2297 | verbose("bind: %.100s", strerror(errno)); | |
2b87da3b | 2298 | |
48e671d5 | 2299 | close(sock); |
2300 | continue; | |
2301 | } | |
2302 | /* Start listening for connections on the socket. */ | |
fce39749 | 2303 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { |
48e671d5 | 2304 | error("listen: %.100s", strerror(errno)); |
2305 | close(sock); | |
2306 | continue; | |
2307 | } | |
2308 | /* Allocate a channel number for the socket. */ | |
8e7895b8 | 2309 | c = channel_new("port listener", type, sock, sock, -1, |
0b242b12 | 2310 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, |
0d942eff | 2311 | 0, "port listener", 1); |
719fc62f | 2312 | strlcpy(c->path, host, sizeof(c->path)); |
2313 | c->host_port = port_to_connect; | |
2314 | c->listening_port = listen_port; | |
48e671d5 | 2315 | success = 1; |
2316 | } | |
2317 | if (success == 0) | |
5641aefa | 2318 | error("channel_setup_fwd_listener: cannot listen to port: %d", |
02a024dd | 2319 | listen_port); |
48e671d5 | 2320 | freeaddrinfo(aitop); |
02a024dd | 2321 | return success; |
5260325f | 2322 | } |
8efc0c15 | 2323 | |
d740ec16 | 2324 | int |
2325 | channel_cancel_rport_listener(const char *host, u_short port) | |
2326 | { | |
9a995072 | 2327 | u_int i; |
2328 | int found = 0; | |
d740ec16 | 2329 | |
f8cc7664 | 2330 | for (i = 0; i < channels_alloc; i++) { |
d740ec16 | 2331 | Channel *c = channels[i]; |
2332 | ||
2333 | if (c != NULL && c->type == SSH_CHANNEL_RPORT_LISTENER && | |
2334 | strncmp(c->path, host, sizeof(c->path)) == 0 && | |
f2107e97 | 2335 | c->listening_port == port) { |
2912cbd6 | 2336 | debug2("%s: close channel %d", __func__, i); |
d740ec16 | 2337 | channel_free(c); |
2338 | found = 1; | |
2339 | } | |
2340 | } | |
2341 | ||
2342 | return (found); | |
2343 | } | |
2344 | ||
5641aefa | 2345 | /* protocol local port fwd, used by ssh (and sshd in v1) */ |
2346 | int | |
3867aa0a | 2347 | channel_setup_local_fwd_listener(const char *listen_host, u_short listen_port, |
5641aefa | 2348 | const char *host_to_connect, u_short port_to_connect, int gateway_ports) |
2349 | { | |
2350 | return channel_setup_fwd_listener(SSH_CHANNEL_PORT_LISTENER, | |
3867aa0a | 2351 | listen_host, listen_port, host_to_connect, port_to_connect, |
2352 | gateway_ports); | |
5641aefa | 2353 | } |
2354 | ||
2355 | /* protocol v2 remote port fwd, used by sshd */ | |
2356 | int | |
2357 | channel_setup_remote_fwd_listener(const char *listen_address, | |
2358 | u_short listen_port, int gateway_ports) | |
2359 | { | |
2360 | return channel_setup_fwd_listener(SSH_CHANNEL_RPORT_LISTENER, | |
2361 | listen_address, listen_port, NULL, 0, gateway_ports); | |
2362 | } | |
2363 | ||
aa3378df | 2364 | /* |
2365 | * Initiate forwarding of connections to port "port" on remote host through | |
2366 | * the secure channel to host:port from local side. | |
2367 | */ | |
8efc0c15 | 2368 | |
6ae2364d | 2369 | void |
3867aa0a | 2370 | channel_request_remote_forwarding(const char *listen_host, u_short listen_port, |
fa08c86b | 2371 | const char *host_to_connect, u_short port_to_connect) |
8efc0c15 | 2372 | { |
54a5250f | 2373 | int type, success = 0; |
fa08c86b | 2374 | |
5260325f | 2375 | /* Record locally that connection to this host/port is permitted. */ |
2376 | if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
2377 | fatal("channel_request_remote_forwarding: too many forwards"); | |
2378 | ||
5260325f | 2379 | /* Send the forward request to the remote side. */ |
7e7327a1 | 2380 | if (compat20) { |
3867aa0a | 2381 | const char *address_to_bind; |
2382 | if (listen_host == NULL) | |
2383 | address_to_bind = "localhost"; | |
2384 | else if (*listen_host == '\0' || strcmp(listen_host, "*") == 0) | |
2385 | address_to_bind = ""; | |
2386 | else | |
2387 | address_to_bind = listen_host; | |
2388 | ||
7e7327a1 | 2389 | packet_start(SSH2_MSG_GLOBAL_REQUEST); |
2390 | packet_put_cstring("tcpip-forward"); | |
e0ae8728 | 2391 | packet_put_char(1); /* boolean: want reply */ |
7e7327a1 | 2392 | packet_put_cstring(address_to_bind); |
2393 | packet_put_int(listen_port); | |
fa08c86b | 2394 | packet_send(); |
2395 | packet_write_wait(); | |
2396 | /* Assume that server accepts the request */ | |
2397 | success = 1; | |
7e7327a1 | 2398 | } else { |
2399 | packet_start(SSH_CMSG_PORT_FORWARD_REQUEST); | |
7e7327a1 | 2400 | packet_put_int(listen_port); |
d6f24e45 | 2401 | packet_put_cstring(host_to_connect); |
2402 | packet_put_int(port_to_connect); | |
7e7327a1 | 2403 | packet_send(); |
2404 | packet_write_wait(); | |
fa08c86b | 2405 | |
2406 | /* Wait for response from the remote side. */ | |
54a5250f | 2407 | type = packet_read(); |
fa08c86b | 2408 | switch (type) { |
2409 | case SSH_SMSG_SUCCESS: | |
2410 | success = 1; | |
2411 | break; | |
2412 | case SSH_SMSG_FAILURE: | |
bbe88b6d | 2413 | logit("Warning: Server denied remote port forwarding."); |
fa08c86b | 2414 | break; |
2415 | default: | |
2416 | /* Unknown packet */ | |
2417 | packet_disconnect("Protocol error for port forward request:" | |
2418 | "received packet type %d.", type); | |
2419 | } | |
2420 | } | |
2421 | if (success) { | |
2422 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host_to_connect); | |
2423 | permitted_opens[num_permitted_opens].port_to_connect = port_to_connect; | |
2424 | permitted_opens[num_permitted_opens].listen_port = listen_port; | |
2425 | num_permitted_opens++; | |
7e7327a1 | 2426 | } |
8efc0c15 | 2427 | } |
2428 | ||
d740ec16 | 2429 | /* |
f2107e97 | 2430 | * Request cancellation of remote forwarding of connection host:port from |
d740ec16 | 2431 | * local side. |
2432 | */ | |
d740ec16 | 2433 | void |
3867aa0a | 2434 | channel_request_rforward_cancel(const char *host, u_short port) |
d740ec16 | 2435 | { |
2436 | int i; | |
d740ec16 | 2437 | |
2438 | if (!compat20) | |
2439 | return; | |
2440 | ||
2441 | for (i = 0; i < num_permitted_opens; i++) { | |
f2107e97 | 2442 | if (permitted_opens[i].host_to_connect != NULL && |
d740ec16 | 2443 | permitted_opens[i].listen_port == port) |
2444 | break; | |
2445 | } | |
2446 | if (i >= num_permitted_opens) { | |
2447 | debug("%s: requested forward not found", __func__); | |
2448 | return; | |
2449 | } | |
2450 | packet_start(SSH2_MSG_GLOBAL_REQUEST); | |
2451 | packet_put_cstring("cancel-tcpip-forward"); | |
2452 | packet_put_char(0); | |
3867aa0a | 2453 | packet_put_cstring(host == NULL ? "" : host); |
d740ec16 | 2454 | packet_put_int(port); |
2455 | packet_send(); | |
2456 | ||
2457 | permitted_opens[i].listen_port = 0; | |
2458 | permitted_opens[i].port_to_connect = 0; | |
2459 | free(permitted_opens[i].host_to_connect); | |
2460 | permitted_opens[i].host_to_connect = NULL; | |
2461 | } | |
2462 | ||
aa3378df | 2463 | /* |
2464 | * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates | |
2465 | * listening for the port, and sends back a success reply (or disconnect | |
2466 | * message if there was an error). This never returns if there was an error. | |
2467 | */ | |
8efc0c15 | 2468 | |
6ae2364d | 2469 | void |
1d1ffb87 | 2470 | channel_input_port_forward_request(int is_root, int gateway_ports) |
8efc0c15 | 2471 | { |
57112b5a | 2472 | u_short port, host_port; |
5260325f | 2473 | char *hostname; |
2474 | ||
2475 | /* Get arguments from the packet. */ | |
2476 | port = packet_get_int(); | |
2477 | hostname = packet_get_string(NULL); | |
2478 | host_port = packet_get_int(); | |
2479 | ||
3c62e7eb | 2480 | #ifndef HAVE_CYGWIN |
aa3378df | 2481 | /* |
2482 | * Check that an unprivileged user is not trying to forward a | |
2483 | * privileged port. | |
2484 | */ | |
5260325f | 2485 | if (port < IPPORT_RESERVED && !is_root) |
8e7c9afc | 2486 | packet_disconnect( |
2487 | "Requested forwarding of port %d but user is not root.", | |
2488 | port); | |
2489 | if (host_port == 0) | |
2490 | packet_disconnect("Dynamic forwarding denied."); | |
3c62e7eb | 2491 | #endif |
8e7c9afc | 2492 | |
fa08c86b | 2493 | /* Initiate forwarding */ |
3867aa0a | 2494 | channel_setup_local_fwd_listener(NULL, port, hostname, |
2495 | host_port, gateway_ports); | |
5260325f | 2496 | |
2497 | /* Free the argument string. */ | |
2498 | xfree(hostname); | |
8efc0c15 | 2499 | } |
2500 | ||
01794848 | 2501 | /* |
2502 | * Permits opening to any host/port if permitted_opens[] is empty. This is | |
2503 | * usually called by the server, because the user could connect to any port | |
2504 | * anyway, and the server has no way to know but to trust the client anyway. | |
2505 | */ | |
2506 | void | |
d5bb9418 | 2507 | channel_permit_all_opens(void) |
01794848 | 2508 | { |
2509 | if (num_permitted_opens == 0) | |
2510 | all_opens_permitted = 1; | |
2511 | } | |
2512 | ||
cd332296 | 2513 | void |
01794848 | 2514 | channel_add_permitted_opens(char *host, int port) |
2515 | { | |
2516 | if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
2517 | fatal("channel_request_remote_forwarding: too many forwards"); | |
2518 | debug("allow port forwarding to host %s port %d", host, port); | |
2519 | ||
2520 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host); | |
2521 | permitted_opens[num_permitted_opens].port_to_connect = port; | |
2522 | num_permitted_opens++; | |
2523 | ||
2524 | all_opens_permitted = 0; | |
2525 | } | |
2526 | ||
cd332296 | 2527 | void |
01794848 | 2528 | channel_clear_permitted_opens(void) |
2529 | { | |
2530 | int i; | |
2531 | ||
2532 | for (i = 0; i < num_permitted_opens; i++) | |
d740ec16 | 2533 | if (permitted_opens[i].host_to_connect != NULL) |
2534 | xfree(permitted_opens[i].host_to_connect); | |
01794848 | 2535 | num_permitted_opens = 0; |
2536 | ||
2537 | } | |
2538 | ||
2539 | ||
2540 | /* return socket to remote host, port */ | |
396c147e | 2541 | static int |
01794848 | 2542 | connect_to(const char *host, u_short port) |
8efc0c15 | 2543 | { |
48e671d5 | 2544 | struct addrinfo hints, *ai, *aitop; |
2545 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; | |
2546 | int gaierr; | |
7368a6c8 | 2547 | int sock = -1; |
48e671d5 | 2548 | |
2549 | memset(&hints, 0, sizeof(hints)); | |
2550 | hints.ai_family = IPv4or6; | |
2551 | hints.ai_socktype = SOCK_STREAM; | |
01794848 | 2552 | snprintf(strport, sizeof strport, "%d", port); |
48e671d5 | 2553 | if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) { |
01794848 | 2554 | error("connect_to %.100s: unknown host (%s)", host, |
2555 | gai_strerror(gaierr)); | |
7368a6c8 | 2556 | return -1; |
48e671d5 | 2557 | } |
48e671d5 | 2558 | for (ai = aitop; ai; ai = ai->ai_next) { |
2559 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
2560 | continue; | |
2561 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), | |
2562 | strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { | |
01794848 | 2563 | error("connect_to: getnameinfo failed"); |
48e671d5 | 2564 | continue; |
5260325f | 2565 | } |
3e131a6d | 2566 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
48e671d5 | 2567 | if (sock < 0) { |
4940c411 | 2568 | if (ai->ai_next == NULL) |
2569 | error("socket: %.100s", strerror(errno)); | |
2570 | else | |
2571 | verbose("socket: %.100s", strerror(errno)); | |
48e671d5 | 2572 | continue; |
5260325f | 2573 | } |
170694d7 | 2574 | if (set_nonblock(sock) == -1) |
2575 | fatal("%s: set_nonblock(%d)", __func__, sock); | |
97fb6912 | 2576 | if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0 && |
2577 | errno != EINPROGRESS) { | |
01794848 | 2578 | error("connect_to %.100s port %s: %.100s", ntop, strport, |
48e671d5 | 2579 | strerror(errno)); |
2580 | close(sock); | |
2b87da3b | 2581 | continue; /* fail -- try next */ |
48e671d5 | 2582 | } |
2583 | break; /* success */ | |
5260325f | 2584 | |
5260325f | 2585 | } |
48e671d5 | 2586 | freeaddrinfo(aitop); |
48e671d5 | 2587 | if (!ai) { |
01794848 | 2588 | error("connect_to %.100s port %d: failed.", host, port); |
7368a6c8 | 2589 | return -1; |
8efc0c15 | 2590 | } |
7368a6c8 | 2591 | /* success */ |
811a6342 | 2592 | set_nodelay(sock); |
7368a6c8 | 2593 | return sock; |
2594 | } | |
01794848 | 2595 | |
fa08c86b | 2596 | int |
b3f8a79c | 2597 | channel_connect_by_listen_address(u_short listen_port) |
fa08c86b | 2598 | { |
2599 | int i; | |
01794848 | 2600 | |
fa08c86b | 2601 | for (i = 0; i < num_permitted_opens; i++) |
d740ec16 | 2602 | if (permitted_opens[i].host_to_connect != NULL && |
2603 | permitted_opens[i].listen_port == listen_port) | |
01794848 | 2604 | return connect_to( |
fa08c86b | 2605 | permitted_opens[i].host_to_connect, |
2606 | permitted_opens[i].port_to_connect); | |
0b6fbf03 | 2607 | error("WARNING: Server requests forwarding for unknown listen_port %d", |
2608 | listen_port); | |
fa08c86b | 2609 | return -1; |
2610 | } | |
48e671d5 | 2611 | |
01794848 | 2612 | /* Check if connecting to that port is permitted and connect. */ |
2613 | int | |
2614 | channel_connect_to(const char *host, u_short port) | |
2615 | { | |
2616 | int i, permit; | |
2617 | ||
2618 | permit = all_opens_permitted; | |
2619 | if (!permit) { | |
2620 | for (i = 0; i < num_permitted_opens; i++) | |
d740ec16 | 2621 | if (permitted_opens[i].host_to_connect != NULL && |
2622 | permitted_opens[i].port_to_connect == port && | |
01794848 | 2623 | strcmp(permitted_opens[i].host_to_connect, host) == 0) |
2624 | permit = 1; | |
2625 | ||
2626 | } | |
2627 | if (!permit) { | |
bbe88b6d | 2628 | logit("Received request to connect to host %.100s port %d, " |
01794848 | 2629 | "but the request was denied.", host, port); |
2630 | return -1; | |
2631 | } | |
2632 | return connect_to(host, port); | |
2633 | } | |
2634 | ||
5e96b616 | 2635 | void |
2636 | channel_send_window_changes(void) | |
2637 | { | |
9a995072 | 2638 | u_int i; |
5e96b616 | 2639 | struct winsize ws; |
2640 | ||
2641 | for (i = 0; i < channels_alloc; i++) { | |
f8cc7664 | 2642 | if (channels[i] == NULL || !channels[i]->client_tty || |
5e96b616 | 2643 | channels[i]->type != SSH_CHANNEL_OPEN) |
2644 | continue; | |
2645 | if (ioctl(channels[i]->rfd, TIOCGWINSZ, &ws) < 0) | |
2646 | continue; | |
2647 | channel_request_start(i, "window-change", 0); | |
2648 | packet_put_int(ws.ws_col); | |
2649 | packet_put_int(ws.ws_row); | |
2650 | packet_put_int(ws.ws_xpixel); | |
2651 | packet_put_int(ws.ws_ypixel); | |
2652 | packet_send(); | |
2653 | } | |
2654 | } | |
2655 | ||
8e7895b8 | 2656 | /* -- X11 forwarding */ |
8efc0c15 | 2657 | |
aa3378df | 2658 | /* |
2659 | * Creates an internet domain socket for listening for X11 connections. | |
57f228e8 | 2660 | * Returns 0 and a suitable display number for the DISPLAY variable |
2661 | * stored in display_numberp , or -1 if an error occurs. | |
aa3378df | 2662 | */ |
c9d0ad9b | 2663 | int |
e6e573bd | 2664 | x11_create_display_inet(int x11_display_offset, int x11_use_localhost, |
d08341e6 | 2665 | int single_connection, u_int *display_numberp, int **chanids) |
8efc0c15 | 2666 | { |
ac151b18 | 2667 | Channel *nc = NULL; |
57112b5a | 2668 | int display_number, sock; |
2669 | u_short port; | |
48e671d5 | 2670 | struct addrinfo hints, *ai, *aitop; |
2671 | char strport[NI_MAXSERV]; | |
2672 | int gaierr, n, num_socks = 0, socks[NUM_SOCKS]; | |
5260325f | 2673 | |
59e5aff5 | 2674 | if (chanids == NULL) |
2675 | return -1; | |
2676 | ||
95f1eccc | 2677 | for (display_number = x11_display_offset; |
184eed6a | 2678 | display_number < MAX_DISPLAYS; |
2679 | display_number++) { | |
5260325f | 2680 | port = 6000 + display_number; |
48e671d5 | 2681 | memset(&hints, 0, sizeof(hints)); |
2682 | hints.ai_family = IPv4or6; | |
e6e573bd | 2683 | hints.ai_flags = x11_use_localhost ? 0: AI_PASSIVE; |
48e671d5 | 2684 | hints.ai_socktype = SOCK_STREAM; |
2685 | snprintf(strport, sizeof strport, "%d", port); | |
2686 | if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) { | |
2687 | error("getaddrinfo: %.100s", gai_strerror(gaierr)); | |
c9d0ad9b | 2688 | return -1; |
5260325f | 2689 | } |
48e671d5 | 2690 | for (ai = aitop; ai; ai = ai->ai_next) { |
2691 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
2692 | continue; | |
3e131a6d | 2693 | sock = socket(ai->ai_family, ai->ai_socktype, |
2694 | ai->ai_protocol); | |
48e671d5 | 2695 | if (sock < 0) { |
4ee81249 | 2696 | if ((errno != EINVAL) && (errno != EAFNOSUPPORT)) { |
80a44451 | 2697 | error("socket: %.100s", strerror(errno)); |
0ea89f7e | 2698 | freeaddrinfo(aitop); |
c9d0ad9b | 2699 | return -1; |
80a44451 | 2700 | } else { |
22d89d24 | 2701 | debug("x11_create_display_inet: Socket family %d not supported", |
2702 | ai->ai_family); | |
80a44451 | 2703 | continue; |
2704 | } | |
48e671d5 | 2705 | } |
688aaeda | 2706 | #ifdef IPV6_V6ONLY |
2707 | if (ai->ai_family == AF_INET6) { | |
2708 | int on = 1; | |
2709 | if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) < 0) | |
2710 | error("setsockopt IPV6_V6ONLY: %.100s", strerror(errno)); | |
2711 | } | |
2712 | #endif | |
48e671d5 | 2713 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { |
d7ac5f18 | 2714 | debug2("bind port %d: %.100s", port, strerror(errno)); |
48e671d5 | 2715 | close(sock); |
16218745 | 2716 | |
2717 | if (ai->ai_next) | |
2718 | continue; | |
2719 | ||
48e671d5 | 2720 | for (n = 0; n < num_socks; n++) { |
48e671d5 | 2721 | close(socks[n]); |
2722 | } | |
2723 | num_socks = 0; | |
2724 | break; | |
2725 | } | |
2726 | socks[num_socks++] = sock; | |
80faa19f | 2727 | #ifndef DONT_TRY_OTHER_AF |
48e671d5 | 2728 | if (num_socks == NUM_SOCKS) |
2729 | break; | |
80faa19f | 2730 | #else |
688aaeda | 2731 | if (x11_use_localhost) { |
2732 | if (num_socks == NUM_SOCKS) | |
2733 | break; | |
2734 | } else { | |
2735 | break; | |
2736 | } | |
80faa19f | 2737 | #endif |
5260325f | 2738 | } |
4ccb01d6 | 2739 | freeaddrinfo(aitop); |
48e671d5 | 2740 | if (num_socks > 0) |
2741 | break; | |
5260325f | 2742 | } |
2743 | if (display_number >= MAX_DISPLAYS) { | |
2744 | error("Failed to allocate internet-domain X11 display socket."); | |
c9d0ad9b | 2745 | return -1; |
8efc0c15 | 2746 | } |
5260325f | 2747 | /* Start listening for connections on the socket. */ |
48e671d5 | 2748 | for (n = 0; n < num_socks; n++) { |
2749 | sock = socks[n]; | |
fce39749 | 2750 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { |
48e671d5 | 2751 | error("listen: %.100s", strerror(errno)); |
48e671d5 | 2752 | close(sock); |
c9d0ad9b | 2753 | return -1; |
a7effaac | 2754 | } |
a7effaac | 2755 | } |
5260325f | 2756 | |
48e671d5 | 2757 | /* Allocate a channel for each socket. */ |
59e5aff5 | 2758 | *chanids = xmalloc(sizeof(**chanids) * (num_socks + 1)); |
48e671d5 | 2759 | for (n = 0; n < num_socks; n++) { |
2760 | sock = socks[n]; | |
ac151b18 | 2761 | nc = channel_new("x11 listener", |
0b242b12 | 2762 | SSH_CHANNEL_X11_LISTENER, sock, sock, -1, |
2763 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, | |
0d942eff | 2764 | 0, "X11 inet listener", 1); |
3a0d3d54 | 2765 | nc->single_connection = single_connection; |
59e5aff5 | 2766 | (*chanids)[n] = nc->self; |
48e671d5 | 2767 | } |
59e5aff5 | 2768 | (*chanids)[n] = -1; |
5260325f | 2769 | |
c9d0ad9b | 2770 | /* Return the display number for the DISPLAY environment variable. */ |
57f228e8 | 2771 | *display_numberp = display_number; |
2772 | return (0); | |
8efc0c15 | 2773 | } |
2774 | ||
396c147e | 2775 | static int |
1e3b8b07 | 2776 | connect_local_xsocket(u_int dnr) |
8efc0c15 | 2777 | { |
5260325f | 2778 | int sock; |
2779 | struct sockaddr_un addr; | |
5260325f | 2780 | |
805e659f | 2781 | sock = socket(AF_UNIX, SOCK_STREAM, 0); |
2782 | if (sock < 0) | |
2783 | error("socket: %.100s", strerror(errno)); | |
2784 | memset(&addr, 0, sizeof(addr)); | |
2785 | addr.sun_family = AF_UNIX; | |
2786 | snprintf(addr.sun_path, sizeof addr.sun_path, _PATH_UNIX_X, dnr); | |
2787 | if (connect(sock, (struct sockaddr *) & addr, sizeof(addr)) == 0) | |
2788 | return sock; | |
2789 | close(sock); | |
5260325f | 2790 | error("connect %.100s: %.100s", addr.sun_path, strerror(errno)); |
2791 | return -1; | |
8efc0c15 | 2792 | } |
2793 | ||
0b242b12 | 2794 | int |
2795 | x11_connect_display(void) | |
8efc0c15 | 2796 | { |
bcc0381e | 2797 | int display_number, sock = 0; |
5260325f | 2798 | const char *display; |
0b242b12 | 2799 | char buf[1024], *cp; |
48e671d5 | 2800 | struct addrinfo hints, *ai, *aitop; |
2801 | char strport[NI_MAXSERV]; | |
2802 | int gaierr; | |
5260325f | 2803 | |
5260325f | 2804 | /* Try to open a socket for the local X server. */ |
2805 | display = getenv("DISPLAY"); | |
2806 | if (!display) { | |
2807 | error("DISPLAY not set."); | |
0b242b12 | 2808 | return -1; |
5260325f | 2809 | } |
aa3378df | 2810 | /* |
2811 | * Now we decode the value of the DISPLAY variable and make a | |
2812 | * connection to the real X server. | |
2813 | */ | |
2814 | ||
2815 | /* | |
2816 | * Check if it is a unix domain socket. Unix domain displays are in | |
2817 | * one of the following formats: unix:d[.s], :d[.s], ::d[.s] | |
2818 | */ | |
5260325f | 2819 | if (strncmp(display, "unix:", 5) == 0 || |
2820 | display[0] == ':') { | |
2821 | /* Connect to the unix domain socket. */ | |
2822 | if (sscanf(strrchr(display, ':') + 1, "%d", &display_number) != 1) { | |
2823 | error("Could not parse display number from DISPLAY: %.100s", | |
184eed6a | 2824 | display); |
0b242b12 | 2825 | return -1; |
5260325f | 2826 | } |
2827 | /* Create a socket. */ | |
2828 | sock = connect_local_xsocket(display_number); | |
2829 | if (sock < 0) | |
0b242b12 | 2830 | return -1; |
5260325f | 2831 | |
2832 | /* OK, we now have a connection to the display. */ | |
0b242b12 | 2833 | return sock; |
5260325f | 2834 | } |
aa3378df | 2835 | /* |
2836 | * Connect to an inet socket. The DISPLAY value is supposedly | |
2837 | * hostname:d[.s], where hostname may also be numeric IP address. | |
2838 | */ | |
74860245 | 2839 | strlcpy(buf, display, sizeof(buf)); |
5260325f | 2840 | cp = strchr(buf, ':'); |
2841 | if (!cp) { | |
2842 | error("Could not find ':' in DISPLAY: %.100s", display); | |
0b242b12 | 2843 | return -1; |
5260325f | 2844 | } |
2845 | *cp = 0; | |
aa3378df | 2846 | /* buf now contains the host name. But first we parse the display number. */ |
5260325f | 2847 | if (sscanf(cp + 1, "%d", &display_number) != 1) { |
2848 | error("Could not parse display number from DISPLAY: %.100s", | |
184eed6a | 2849 | display); |
0b242b12 | 2850 | return -1; |
5260325f | 2851 | } |
5260325f | 2852 | |
48e671d5 | 2853 | /* Look up the host address */ |
2854 | memset(&hints, 0, sizeof(hints)); | |
2855 | hints.ai_family = IPv4or6; | |
2856 | hints.ai_socktype = SOCK_STREAM; | |
2857 | snprintf(strport, sizeof strport, "%d", 6000 + display_number); | |
2858 | if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) { | |
2859 | error("%.100s: unknown host. (%s)", buf, gai_strerror(gaierr)); | |
0b242b12 | 2860 | return -1; |
8efc0c15 | 2861 | } |
48e671d5 | 2862 | for (ai = aitop; ai; ai = ai->ai_next) { |
2863 | /* Create a socket. */ | |
3e131a6d | 2864 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
48e671d5 | 2865 | if (sock < 0) { |
d7ac5f18 | 2866 | debug2("socket: %.100s", strerror(errno)); |
7368a6c8 | 2867 | continue; |
2868 | } | |
2869 | /* Connect it to the display. */ | |
2870 | if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) { | |
d7ac5f18 | 2871 | debug2("connect %.100s port %d: %.100s", buf, |
7368a6c8 | 2872 | 6000 + display_number, strerror(errno)); |
2873 | close(sock); | |
2874 | continue; | |
2875 | } | |
2876 | /* Success */ | |
2877 | break; | |
48e671d5 | 2878 | } |
48e671d5 | 2879 | freeaddrinfo(aitop); |
2880 | if (!ai) { | |
6ae2364d | 2881 | error("connect %.100s port %d: %.100s", buf, 6000 + display_number, |
48e671d5 | 2882 | strerror(errno)); |
0b242b12 | 2883 | return -1; |
8efc0c15 | 2884 | } |
bcc0381e | 2885 | set_nodelay(sock); |
0b242b12 | 2886 | return sock; |
2887 | } | |
5260325f | 2888 | |
0b242b12 | 2889 | /* |
2890 | * This is called when SSH_SMSG_X11_OPEN is received. The packet contains | |
2891 | * the remote channel number. We should do whatever we want, and respond | |
2892 | * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE. | |
2893 | */ | |
5260325f | 2894 | |
0b242b12 | 2895 | void |
7819b5c3 | 2896 | x11_input_open(int type, u_int32_t seq, void *ctxt) |
0b242b12 | 2897 | { |
719fc62f | 2898 | Channel *c = NULL; |
2899 | int remote_id, sock = 0; | |
0b242b12 | 2900 | char *remote_host; |
5260325f | 2901 | |
719fc62f | 2902 | debug("Received X11 open request."); |
5260325f | 2903 | |
719fc62f | 2904 | remote_id = packet_get_int(); |
8e7895b8 | 2905 | |
2906 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) { | |
719fc62f | 2907 | remote_host = packet_get_string(NULL); |
0b242b12 | 2908 | } else { |
2909 | remote_host = xstrdup("unknown (remote did not supply name)"); | |
0b242b12 | 2910 | } |
95500969 | 2911 | packet_check_eom(); |
0b242b12 | 2912 | |
2913 | /* Obtain a connection to the real X display. */ | |
2914 | sock = x11_connect_display(); | |
719fc62f | 2915 | if (sock != -1) { |
2916 | /* Allocate a channel for this connection. */ | |
2917 | c = channel_new("connected x11 socket", | |
2918 | SSH_CHANNEL_X11_OPEN, sock, sock, -1, 0, 0, 0, | |
2919 | remote_host, 1); | |
3a0d3d54 | 2920 | c->remote_id = remote_id; |
2921 | c->force_drain = 1; | |
719fc62f | 2922 | } |
0d942eff | 2923 | xfree(remote_host); |
719fc62f | 2924 | if (c == NULL) { |
0b242b12 | 2925 | /* Send refusal to the remote host. */ |
2926 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
719fc62f | 2927 | packet_put_int(remote_id); |
0b242b12 | 2928 | } else { |
0b242b12 | 2929 | /* Send a confirmation to the remote host. */ |
2930 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
719fc62f | 2931 | packet_put_int(remote_id); |
2932 | packet_put_int(c->self); | |
0b242b12 | 2933 | } |
719fc62f | 2934 | packet_send(); |
8efc0c15 | 2935 | } |
2936 | ||
a22aff1f | 2937 | /* dummy protocol handler that denies SSH-1 requests (agent/x11) */ |
2938 | void | |
7819b5c3 | 2939 | deny_input_open(int type, u_int32_t seq, void *ctxt) |
a22aff1f | 2940 | { |
2941 | int rchan = packet_get_int(); | |
e1feb9bf | 2942 | |
6aacefa7 | 2943 | switch (type) { |
a22aff1f | 2944 | case SSH_SMSG_AGENT_OPEN: |
2945 | error("Warning: ssh server tried agent forwarding."); | |
2946 | break; | |
2947 | case SSH_SMSG_X11_OPEN: | |
2948 | error("Warning: ssh server tried X11 forwarding."); | |
2949 | break; | |
2950 | default: | |
7819b5c3 | 2951 | error("deny_input_open: type %d", type); |
a22aff1f | 2952 | break; |
2953 | } | |
2954 | error("Warning: this is probably a break in attempt by a malicious server."); | |
2955 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
2956 | packet_put_int(rchan); | |
2957 | packet_send(); | |
2958 | } | |
2959 | ||
aa3378df | 2960 | /* |
2961 | * Requests forwarding of X11 connections, generates fake authentication | |
2962 | * data, and enables authentication spoofing. | |
8e7895b8 | 2963 | * This should be called in the client only. |
aa3378df | 2964 | */ |
6ae2364d | 2965 | void |
9bf083eb | 2966 | x11_request_forwarding_with_spoofing(int client_session_id, const char *disp, |
0b242b12 | 2967 | const char *proto, const char *data) |
8efc0c15 | 2968 | { |
1e3b8b07 | 2969 | u_int data_len = (u_int) strlen(data) / 2; |
ef07103c | 2970 | u_int i, value; |
5260325f | 2971 | char *new_data; |
2972 | int screen_number; | |
2973 | const char *cp; | |
ca75d7de | 2974 | u_int32_t rnd = 0; |
5260325f | 2975 | |
4297b666 | 2976 | if (x11_saved_display == NULL) |
2977 | x11_saved_display = xstrdup(disp); | |
2978 | else if (strcmp(disp, x11_saved_display) != 0) { | |
ef07103c | 2979 | error("x11_request_forwarding_with_spoofing: different " |
2980 | "$DISPLAY already forwarded"); | |
2981 | return; | |
2982 | } | |
2983 | ||
9bf083eb | 2984 | cp = disp; |
2985 | if (disp) | |
2986 | cp = strchr(disp, ':'); | |
5260325f | 2987 | if (cp) |
2988 | cp = strchr(cp, '.'); | |
2989 | if (cp) | |
2990 | screen_number = atoi(cp + 1); | |
2991 | else | |
2992 | screen_number = 0; | |
2993 | ||
ef07103c | 2994 | if (x11_saved_proto == NULL) { |
2995 | /* Save protocol name. */ | |
2996 | x11_saved_proto = xstrdup(proto); | |
2997 | /* | |
56964485 | 2998 | * Extract real authentication data and generate fake data |
ef07103c | 2999 | * of the same length. |
3000 | */ | |
3001 | x11_saved_data = xmalloc(data_len); | |
3002 | x11_fake_data = xmalloc(data_len); | |
3003 | for (i = 0; i < data_len; i++) { | |
3004 | if (sscanf(data + 2 * i, "%2x", &value) != 1) | |
3005 | fatal("x11_request_forwarding: bad " | |
3006 | "authentication data: %.100s", data); | |
3007 | if (i % 4 == 0) | |
3008 | rnd = arc4random(); | |
3009 | x11_saved_data[i] = value; | |
3010 | x11_fake_data[i] = rnd & 0xff; | |
3011 | rnd >>= 8; | |
3012 | } | |
3013 | x11_saved_data_len = data_len; | |
3014 | x11_fake_data_len = data_len; | |
3015 | } | |
5260325f | 3016 | |
3017 | /* Convert the fake data into hex. */ | |
ef07103c | 3018 | new_data = tohex(x11_fake_data, data_len); |
5260325f | 3019 | |
3020 | /* Send the request packet. */ | |
0b242b12 | 3021 | if (compat20) { |
3022 | channel_request_start(client_session_id, "x11-req", 0); | |
3023 | packet_put_char(0); /* XXX bool single connection */ | |
3024 | } else { | |
3025 | packet_start(SSH_CMSG_X11_REQUEST_FORWARDING); | |
3026 | } | |
3027 | packet_put_cstring(proto); | |
3028 | packet_put_cstring(new_data); | |
5260325f | 3029 | packet_put_int(screen_number); |
3030 | packet_send(); | |
3031 | packet_write_wait(); | |
3032 | xfree(new_data); | |
8efc0c15 | 3033 | } |
3034 | ||
8e7895b8 | 3035 | |
3036 | /* -- agent forwarding */ | |
3037 | ||
8efc0c15 | 3038 | /* Sends a message to the server to request authentication fd forwarding. */ |
3039 | ||
6ae2364d | 3040 | void |
d5bb9418 | 3041 | auth_request_forwarding(void) |
8efc0c15 | 3042 | { |
5260325f | 3043 | packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING); |
3044 | packet_send(); | |
3045 | packet_write_wait(); | |
8efc0c15 | 3046 | } |