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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. |
a96070d4 | 16 | * Copyright (c) 1999, 2000, 2001 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" | |
d24631c9 | 42 | RCSID("$OpenBSD: channels.c,v 1.146 2001/12/06 18:20:32 stevesk 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" | |
8efc0c15 | 49 | #include "uidswap.h" |
42f11eb2 | 50 | #include "log.h" |
51 | #include "misc.h" | |
8efc0c15 | 52 | #include "channels.h" |
8efc0c15 | 53 | #include "compat.h" |
42f11eb2 | 54 | #include "canohost.h" |
4c8722d9 | 55 | #include "key.h" |
56 | #include "authfd.h" | |
7e7327a1 | 57 | |
8efc0c15 | 58 | |
8e7895b8 | 59 | /* -- channel core */ |
8efc0c15 | 60 | |
aa3378df | 61 | /* |
62 | * Pointer to an array containing all allocated channels. The array is | |
63 | * dynamically extended as needed. | |
64 | */ | |
719fc62f | 65 | static Channel **channels = NULL; |
8efc0c15 | 66 | |
aa3378df | 67 | /* |
68 | * Size of the channel array. All slots of the array must always be | |
719fc62f | 69 | * initialized (at least the type field); unused slots set to NULL |
aa3378df | 70 | */ |
8efc0c15 | 71 | static int channels_alloc = 0; |
72 | ||
aa3378df | 73 | /* |
74 | * Maximum file descriptor value used in any of the channels. This is | |
719fc62f | 75 | * updated in channel_new. |
aa3378df | 76 | */ |
39929cdb | 77 | static int channel_max_fd = 0; |
8efc0c15 | 78 | |
8efc0c15 | 79 | |
8e7895b8 | 80 | /* -- tcp forwarding */ |
8efc0c15 | 81 | |
aa3378df | 82 | /* |
83 | * Data structure for storing which hosts are permitted for forward requests. | |
84 | * The local sides of any remote forwards are stored in this array to prevent | |
85 | * a corrupt remote server from accessing arbitrary TCP/IP ports on our local | |
86 | * network (which might be behind a firewall). | |
87 | */ | |
5260325f | 88 | typedef struct { |
7368a6c8 | 89 | char *host_to_connect; /* Connect to 'host'. */ |
90 | u_short port_to_connect; /* Connect to 'port'. */ | |
91 | u_short listen_port; /* Remote side should listen port number. */ | |
8efc0c15 | 92 | } ForwardPermission; |
93 | ||
94 | /* List of all permitted host/port pairs to connect. */ | |
95 | static ForwardPermission permitted_opens[SSH_MAX_FORWARDS_PER_DIRECTION]; | |
8e7895b8 | 96 | |
8efc0c15 | 97 | /* Number of permitted host/port pairs in the array. */ |
98 | static int num_permitted_opens = 0; | |
aa3378df | 99 | /* |
100 | * If this is true, all opens are permitted. This is the case on the server | |
101 | * on which we have to trust the client anyway, and the user could do | |
102 | * anything after logging in anyway. | |
103 | */ | |
8efc0c15 | 104 | static int all_opens_permitted = 0; |
105 | ||
8efc0c15 | 106 | |
8e7895b8 | 107 | /* -- X11 forwarding */ |
42f11eb2 | 108 | |
8e7895b8 | 109 | /* Maximum number of fake X11 displays to try. */ |
110 | #define MAX_DISPLAYS 1000 | |
0490e609 | 111 | |
8e7895b8 | 112 | /* Saved X11 authentication protocol name. */ |
113 | static char *x11_saved_proto = NULL; | |
8efc0c15 | 114 | |
8e7895b8 | 115 | /* Saved X11 authentication data. This is the real data. */ |
116 | static char *x11_saved_data = NULL; | |
117 | static u_int x11_saved_data_len = 0; | |
118 | ||
119 | /* | |
120 | * Fake X11 authentication data. This is what the server will be sending us; | |
121 | * we should replace any occurrences of this by the real data. | |
122 | */ | |
123 | static char *x11_fake_data = NULL; | |
124 | static u_int x11_fake_data_len; | |
125 | ||
126 | ||
127 | /* -- agent forwarding */ | |
8efc0c15 | 128 | |
8e7895b8 | 129 | #define NUM_SOCKS 10 |
130 | ||
131 | /* Name and directory of socket for authentication agent forwarding. */ | |
132 | static char *auth_sock_name = NULL; | |
133 | static char *auth_sock_dir = NULL; | |
134 | ||
8e7895b8 | 135 | /* AF_UNSPEC or AF_INET or AF_INET6 */ |
5e4a7219 | 136 | static int IPv4or6 = AF_UNSPEC; |
8e7895b8 | 137 | |
138 | /* helper */ | |
396c147e | 139 | static void port_open_helper(Channel *c, char *rtype); |
8e7895b8 | 140 | |
141 | /* -- channel core */ | |
7368a6c8 | 142 | |
143 | Channel * | |
144 | channel_lookup(int id) | |
145 | { | |
146 | Channel *c; | |
719fc62f | 147 | |
3e98362e | 148 | if (id < 0 || id > channels_alloc) { |
7368a6c8 | 149 | log("channel_lookup: %d: bad id", id); |
150 | return NULL; | |
151 | } | |
719fc62f | 152 | c = channels[id]; |
153 | if (c == NULL) { | |
7368a6c8 | 154 | log("channel_lookup: %d: bad id: channel free", id); |
155 | return NULL; | |
156 | } | |
157 | return c; | |
158 | } | |
159 | ||
aa3378df | 160 | /* |
1d1ffb87 | 161 | * Register filedescriptors for a channel, used when allocating a channel or |
0fbe8c74 | 162 | * when the channel consumer/producer is ready, e.g. shell exec'd |
aa3378df | 163 | */ |
8efc0c15 | 164 | |
396c147e | 165 | static void |
a22aff1f | 166 | channel_register_fds(Channel *c, int rfd, int wfd, int efd, |
167 | int extusage, int nonblock) | |
8efc0c15 | 168 | { |
5260325f | 169 | /* Update the maximum file descriptor value. */ |
39929cdb | 170 | channel_max_fd = MAX(channel_max_fd, rfd); |
171 | channel_max_fd = MAX(channel_max_fd, wfd); | |
172 | channel_max_fd = MAX(channel_max_fd, efd); | |
173 | ||
aa3378df | 174 | /* XXX set close-on-exec -markus */ |
1d1ffb87 | 175 | |
0fbe8c74 | 176 | c->rfd = rfd; |
177 | c->wfd = wfd; | |
178 | c->sock = (rfd == wfd) ? rfd : -1; | |
179 | c->efd = efd; | |
180 | c->extended_usage = extusage; | |
a22aff1f | 181 | |
0ae4fe1d | 182 | /* XXX ugly hack: nonblock is only set by the server */ |
183 | if (nonblock && isatty(c->rfd)) { | |
94dfb550 | 184 | debug("channel %d: rfd %d isatty", c->self, c->rfd); |
0ae4fe1d | 185 | c->isatty = 1; |
186 | if (!isatty(c->wfd)) { | |
94dfb550 | 187 | error("channel %d: wfd %d is not a tty?", |
0ae4fe1d | 188 | c->self, c->wfd); |
189 | } | |
190 | } else { | |
191 | c->isatty = 0; | |
192 | } | |
193 | ||
a22aff1f | 194 | /* enable nonblocking mode */ |
195 | if (nonblock) { | |
196 | if (rfd != -1) | |
197 | set_nonblock(rfd); | |
198 | if (wfd != -1) | |
199 | set_nonblock(wfd); | |
200 | if (efd != -1) | |
201 | set_nonblock(efd); | |
202 | } | |
0fbe8c74 | 203 | } |
204 | ||
205 | /* | |
206 | * Allocate a new channel object and set its type and socket. This will cause | |
207 | * remote_name to be freed. | |
208 | */ | |
209 | ||
719fc62f | 210 | Channel * |
0fbe8c74 | 211 | channel_new(char *ctype, int type, int rfd, int wfd, int efd, |
a22aff1f | 212 | int window, int maxpack, int extusage, char *remote_name, int nonblock) |
0fbe8c74 | 213 | { |
214 | int i, found; | |
215 | Channel *c; | |
5260325f | 216 | |
217 | /* Do initial allocation if this is the first call. */ | |
218 | if (channels_alloc == 0) { | |
7e7327a1 | 219 | chan_init(); |
5260325f | 220 | channels_alloc = 10; |
719fc62f | 221 | channels = xmalloc(channels_alloc * sizeof(Channel *)); |
5260325f | 222 | for (i = 0; i < channels_alloc; i++) |
719fc62f | 223 | channels[i] = NULL; |
d6746a0b | 224 | fatal_add_cleanup((void (*) (void *)) channel_free_all, NULL); |
5260325f | 225 | } |
226 | /* Try to find a free slot where to put the new channel. */ | |
227 | for (found = -1, i = 0; i < channels_alloc; i++) | |
719fc62f | 228 | if (channels[i] == NULL) { |
5260325f | 229 | /* Found a free slot. */ |
230 | found = i; | |
231 | break; | |
232 | } | |
233 | if (found == -1) { | |
aa3378df | 234 | /* There are no free slots. Take last+1 slot and expand the array. */ |
5260325f | 235 | found = channels_alloc; |
236 | channels_alloc += 10; | |
de273eef | 237 | debug2("channel: expanding %d", channels_alloc); |
719fc62f | 238 | channels = xrealloc(channels, channels_alloc * sizeof(Channel *)); |
5260325f | 239 | for (i = found; i < channels_alloc; i++) |
719fc62f | 240 | channels[i] = NULL; |
5260325f | 241 | } |
719fc62f | 242 | /* Initialize and return new channel. */ |
243 | c = channels[found] = xmalloc(sizeof(Channel)); | |
639cb8ab | 244 | memset(c, 0, sizeof(Channel)); |
5260325f | 245 | buffer_init(&c->input); |
246 | buffer_init(&c->output); | |
7368a6c8 | 247 | buffer_init(&c->extended); |
5260325f | 248 | chan_init_iostates(c); |
a22aff1f | 249 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock); |
5260325f | 250 | c->self = found; |
251 | c->type = type; | |
7368a6c8 | 252 | c->ctype = ctype; |
0b242b12 | 253 | c->local_window = window; |
254 | c->local_window_max = window; | |
255 | c->local_consumed = 0; | |
256 | c->local_maxpacket = maxpack; | |
5260325f | 257 | c->remote_id = -1; |
258 | c->remote_name = remote_name; | |
7368a6c8 | 259 | c->remote_window = 0; |
260 | c->remote_maxpacket = 0; | |
261 | c->cb_fn = NULL; | |
262 | c->cb_arg = NULL; | |
263 | c->cb_event = 0; | |
a5f82435 | 264 | c->force_drain = 0; |
3cf2be58 | 265 | c->detach_user = NULL; |
2e73a022 | 266 | c->input_filter = NULL; |
5260325f | 267 | debug("channel %d: new [%s]", found, remote_name); |
719fc62f | 268 | return c; |
7368a6c8 | 269 | } |
8efc0c15 | 270 | |
489aa2e9 | 271 | static int |
272 | channel_find_maxfd(void) | |
273 | { | |
274 | int i, max = 0; | |
275 | Channel *c; | |
276 | ||
277 | for (i = 0; i < channels_alloc; i++) { | |
278 | c = channels[i]; | |
279 | if (c != NULL) { | |
280 | max = MAX(max, c->rfd); | |
281 | max = MAX(max, c->wfd); | |
282 | max = MAX(max, c->efd); | |
283 | } | |
284 | } | |
285 | return max; | |
286 | } | |
287 | ||
288 | int | |
289 | channel_close_fd(int *fdp) | |
290 | { | |
291 | int ret = 0, fd = *fdp; | |
292 | ||
293 | if (fd != -1) { | |
294 | ret = close(fd); | |
295 | *fdp = -1; | |
296 | if (fd == channel_max_fd) | |
297 | channel_max_fd = channel_find_maxfd(); | |
298 | } | |
299 | return ret; | |
300 | } | |
301 | ||
0fbe8c74 | 302 | /* Close all channel fd/socket. */ |
303 | ||
396c147e | 304 | static void |
0fbe8c74 | 305 | channel_close_fds(Channel *c) |
306 | { | |
6fd8622b | 307 | debug3("channel_close_fds: channel %d: r %d w %d e %d", |
308 | c->self, c->rfd, c->wfd, c->efd); | |
309 | ||
489aa2e9 | 310 | channel_close_fd(&c->sock); |
311 | channel_close_fd(&c->rfd); | |
312 | channel_close_fd(&c->wfd); | |
313 | channel_close_fd(&c->efd); | |
0fbe8c74 | 314 | } |
315 | ||
8e7895b8 | 316 | /* Free the channel and close its fd/socket. */ |
317 | ||
318 | void | |
319 | channel_free(Channel *c) | |
320 | { | |
321 | char *s; | |
322 | int i, n; | |
323 | ||
324 | for (n = 0, i = 0; i < channels_alloc; i++) | |
325 | if (channels[i]) | |
326 | n++; | |
327 | debug("channel_free: channel %d: %s, nchannels %d", c->self, | |
328 | c->remote_name ? c->remote_name : "???", n); | |
329 | ||
330 | s = channel_open_message(); | |
331 | debug3("channel_free: status: %s", s); | |
332 | xfree(s); | |
333 | ||
8e7895b8 | 334 | if (c->sock != -1) |
335 | shutdown(c->sock, SHUT_RDWR); | |
336 | channel_close_fds(c); | |
337 | buffer_free(&c->input); | |
338 | buffer_free(&c->output); | |
339 | buffer_free(&c->extended); | |
340 | if (c->remote_name) { | |
341 | xfree(c->remote_name); | |
342 | c->remote_name = NULL; | |
343 | } | |
344 | channels[c->self] = NULL; | |
345 | xfree(c); | |
346 | } | |
347 | ||
8e7895b8 | 348 | void |
d6746a0b | 349 | channel_free_all(void) |
8e7895b8 | 350 | { |
351 | int i; | |
8e7895b8 | 352 | |
d6746a0b | 353 | for (i = 0; i < channels_alloc; i++) |
354 | if (channels[i] != NULL) | |
355 | channel_free(channels[i]); | |
8e7895b8 | 356 | } |
357 | ||
358 | /* | |
359 | * Closes the sockets/fds of all channels. This is used to close extra file | |
360 | * descriptors after a fork. | |
361 | */ | |
362 | ||
363 | void | |
d5bb9418 | 364 | channel_close_all(void) |
8e7895b8 | 365 | { |
366 | int i; | |
367 | ||
368 | for (i = 0; i < channels_alloc; i++) | |
369 | if (channels[i] != NULL) | |
370 | channel_close_fds(channels[i]); | |
371 | } | |
372 | ||
3cf2be58 | 373 | /* |
374 | * Stop listening to channels. | |
375 | */ | |
376 | ||
377 | void | |
378 | channel_stop_listening(void) | |
379 | { | |
380 | int i; | |
381 | Channel *c; | |
382 | ||
383 | for (i = 0; i < channels_alloc; i++) { | |
384 | c = channels[i]; | |
385 | if (c != NULL) { | |
386 | switch (c->type) { | |
387 | case SSH_CHANNEL_AUTH_SOCKET: | |
388 | case SSH_CHANNEL_PORT_LISTENER: | |
389 | case SSH_CHANNEL_RPORT_LISTENER: | |
390 | case SSH_CHANNEL_X11_LISTENER: | |
489aa2e9 | 391 | channel_close_fd(&c->sock); |
3cf2be58 | 392 | channel_free(c); |
393 | break; | |
394 | } | |
395 | } | |
396 | } | |
397 | } | |
398 | ||
8e7895b8 | 399 | /* |
400 | * Returns true if no channel has too much buffered data, and false if one or | |
401 | * more channel is overfull. | |
402 | */ | |
403 | ||
404 | int | |
d5bb9418 | 405 | channel_not_very_much_buffered_data(void) |
8e7895b8 | 406 | { |
407 | u_int i; | |
408 | Channel *c; | |
409 | ||
410 | for (i = 0; i < channels_alloc; i++) { | |
411 | c = channels[i]; | |
412 | if (c != NULL && c->type == SSH_CHANNEL_OPEN) { | |
0c139bd1 | 413 | #if 0 |
414 | if (!compat20 && | |
415 | buffer_len(&c->input) > packet_get_maxsize()) { | |
8e7895b8 | 416 | debug("channel %d: big input buffer %d", |
417 | c->self, buffer_len(&c->input)); | |
418 | return 0; | |
419 | } | |
0c139bd1 | 420 | #endif |
8e7895b8 | 421 | if (buffer_len(&c->output) > packet_get_maxsize()) { |
0c139bd1 | 422 | debug("channel %d: big output buffer %d > %d", |
423 | c->self, buffer_len(&c->output), | |
424 | packet_get_maxsize()); | |
8e7895b8 | 425 | return 0; |
426 | } | |
427 | } | |
428 | } | |
429 | return 1; | |
430 | } | |
431 | ||
432 | /* Returns true if any channel is still open. */ | |
433 | ||
434 | int | |
d5bb9418 | 435 | channel_still_open(void) |
8e7895b8 | 436 | { |
437 | int i; | |
438 | Channel *c; | |
439 | ||
440 | for (i = 0; i < channels_alloc; i++) { | |
441 | c = channels[i]; | |
442 | if (c == NULL) | |
443 | continue; | |
444 | switch (c->type) { | |
445 | case SSH_CHANNEL_X11_LISTENER: | |
446 | case SSH_CHANNEL_PORT_LISTENER: | |
447 | case SSH_CHANNEL_RPORT_LISTENER: | |
448 | case SSH_CHANNEL_CLOSED: | |
449 | case SSH_CHANNEL_AUTH_SOCKET: | |
450 | case SSH_CHANNEL_DYNAMIC: | |
451 | case SSH_CHANNEL_CONNECTING: | |
452 | case SSH_CHANNEL_ZOMBIE: | |
453 | continue; | |
454 | case SSH_CHANNEL_LARVAL: | |
455 | if (!compat20) | |
456 | fatal("cannot happen: SSH_CHANNEL_LARVAL"); | |
457 | continue; | |
458 | case SSH_CHANNEL_OPENING: | |
459 | case SSH_CHANNEL_OPEN: | |
460 | case SSH_CHANNEL_X11_OPEN: | |
461 | return 1; | |
462 | case SSH_CHANNEL_INPUT_DRAINING: | |
463 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
464 | if (!compat13) | |
465 | fatal("cannot happen: OUT_DRAIN"); | |
466 | return 1; | |
467 | default: | |
468 | fatal("channel_still_open: bad channel type %d", c->type); | |
469 | /* NOTREACHED */ | |
470 | } | |
471 | } | |
472 | return 0; | |
473 | } | |
474 | ||
475 | /* Returns the id of an open channel suitable for keepaliving */ | |
476 | ||
477 | int | |
d5bb9418 | 478 | channel_find_open(void) |
8e7895b8 | 479 | { |
480 | int i; | |
481 | Channel *c; | |
482 | ||
483 | for (i = 0; i < channels_alloc; i++) { | |
484 | c = channels[i]; | |
485 | if (c == NULL) | |
486 | continue; | |
487 | switch (c->type) { | |
488 | case SSH_CHANNEL_CLOSED: | |
489 | case SSH_CHANNEL_DYNAMIC: | |
490 | case SSH_CHANNEL_X11_LISTENER: | |
491 | case SSH_CHANNEL_PORT_LISTENER: | |
492 | case SSH_CHANNEL_RPORT_LISTENER: | |
493 | case SSH_CHANNEL_OPENING: | |
494 | case SSH_CHANNEL_CONNECTING: | |
495 | case SSH_CHANNEL_ZOMBIE: | |
496 | continue; | |
497 | case SSH_CHANNEL_LARVAL: | |
498 | case SSH_CHANNEL_AUTH_SOCKET: | |
499 | case SSH_CHANNEL_OPEN: | |
500 | case SSH_CHANNEL_X11_OPEN: | |
501 | return i; | |
502 | case SSH_CHANNEL_INPUT_DRAINING: | |
503 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
504 | if (!compat13) | |
505 | fatal("cannot happen: OUT_DRAIN"); | |
506 | return i; | |
507 | default: | |
508 | fatal("channel_find_open: bad channel type %d", c->type); | |
509 | /* NOTREACHED */ | |
510 | } | |
511 | } | |
512 | return -1; | |
513 | } | |
514 | ||
515 | ||
516 | /* | |
517 | * Returns a message describing the currently open forwarded connections, | |
518 | * suitable for sending to the client. The message contains crlf pairs for | |
519 | * newlines. | |
520 | */ | |
521 | ||
522 | char * | |
d5bb9418 | 523 | channel_open_message(void) |
8e7895b8 | 524 | { |
525 | Buffer buffer; | |
526 | Channel *c; | |
527 | char buf[1024], *cp; | |
528 | int i; | |
529 | ||
530 | buffer_init(&buffer); | |
531 | snprintf(buf, sizeof buf, "The following connections are open:\r\n"); | |
532 | buffer_append(&buffer, buf, strlen(buf)); | |
533 | for (i = 0; i < channels_alloc; i++) { | |
534 | c = channels[i]; | |
535 | if (c == NULL) | |
536 | continue; | |
537 | switch (c->type) { | |
538 | case SSH_CHANNEL_X11_LISTENER: | |
539 | case SSH_CHANNEL_PORT_LISTENER: | |
540 | case SSH_CHANNEL_RPORT_LISTENER: | |
541 | case SSH_CHANNEL_CLOSED: | |
542 | case SSH_CHANNEL_AUTH_SOCKET: | |
543 | case SSH_CHANNEL_ZOMBIE: | |
544 | continue; | |
545 | case SSH_CHANNEL_LARVAL: | |
546 | case SSH_CHANNEL_OPENING: | |
547 | case SSH_CHANNEL_CONNECTING: | |
548 | case SSH_CHANNEL_DYNAMIC: | |
549 | case SSH_CHANNEL_OPEN: | |
550 | case SSH_CHANNEL_X11_OPEN: | |
551 | case SSH_CHANNEL_INPUT_DRAINING: | |
552 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
553 | snprintf(buf, sizeof buf, " #%d %.300s (t%d r%d i%d/%d o%d/%d fd %d/%d)\r\n", | |
554 | c->self, c->remote_name, | |
555 | c->type, c->remote_id, | |
556 | c->istate, buffer_len(&c->input), | |
557 | c->ostate, buffer_len(&c->output), | |
558 | c->rfd, c->wfd); | |
559 | buffer_append(&buffer, buf, strlen(buf)); | |
560 | continue; | |
561 | default: | |
562 | fatal("channel_open_message: bad channel type %d", c->type); | |
563 | /* NOTREACHED */ | |
564 | } | |
565 | } | |
566 | buffer_append(&buffer, "\0", 1); | |
567 | cp = xstrdup(buffer_ptr(&buffer)); | |
568 | buffer_free(&buffer); | |
569 | return cp; | |
570 | } | |
571 | ||
572 | void | |
573 | channel_send_open(int id) | |
574 | { | |
575 | Channel *c = channel_lookup(id); | |
576 | if (c == NULL) { | |
577 | log("channel_send_open: %d: bad id", id); | |
578 | return; | |
579 | } | |
580 | debug("send channel open %d", id); | |
581 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
582 | packet_put_cstring(c->ctype); | |
583 | packet_put_int(c->self); | |
584 | packet_put_int(c->local_window); | |
585 | packet_put_int(c->local_maxpacket); | |
586 | packet_send(); | |
587 | } | |
588 | ||
589 | void | |
590 | channel_request(int id, char *service, int wantconfirm) | |
591 | { | |
592 | channel_request_start(id, service, wantconfirm); | |
593 | packet_send(); | |
594 | debug("channel request %d: %s", id, service) ; | |
595 | } | |
596 | void | |
597 | channel_request_start(int id, char *service, int wantconfirm) | |
598 | { | |
599 | Channel *c = channel_lookup(id); | |
600 | if (c == NULL) { | |
601 | log("channel_request: %d: bad id", id); | |
602 | return; | |
603 | } | |
604 | packet_start(SSH2_MSG_CHANNEL_REQUEST); | |
605 | packet_put_int(c->remote_id); | |
606 | packet_put_cstring(service); | |
607 | packet_put_char(wantconfirm); | |
608 | } | |
609 | void | |
610 | channel_register_callback(int id, int mtype, channel_callback_fn *fn, void *arg) | |
611 | { | |
612 | Channel *c = channel_lookup(id); | |
613 | if (c == NULL) { | |
614 | log("channel_register_callback: %d: bad id", id); | |
615 | return; | |
616 | } | |
617 | c->cb_event = mtype; | |
618 | c->cb_fn = fn; | |
619 | c->cb_arg = arg; | |
620 | } | |
621 | void | |
622 | channel_register_cleanup(int id, channel_callback_fn *fn) | |
623 | { | |
624 | Channel *c = channel_lookup(id); | |
625 | if (c == NULL) { | |
626 | log("channel_register_cleanup: %d: bad id", id); | |
627 | return; | |
628 | } | |
3cf2be58 | 629 | c->detach_user = fn; |
8e7895b8 | 630 | } |
631 | void | |
632 | channel_cancel_cleanup(int id) | |
633 | { | |
634 | Channel *c = channel_lookup(id); | |
635 | if (c == NULL) { | |
636 | log("channel_cancel_cleanup: %d: bad id", id); | |
637 | return; | |
638 | } | |
3cf2be58 | 639 | c->detach_user = NULL; |
8e7895b8 | 640 | } |
641 | void | |
642 | channel_register_filter(int id, channel_filter_fn *fn) | |
643 | { | |
644 | Channel *c = channel_lookup(id); | |
645 | if (c == NULL) { | |
646 | log("channel_register_filter: %d: bad id", id); | |
647 | return; | |
648 | } | |
649 | c->input_filter = fn; | |
650 | } | |
651 | ||
6ae2364d | 652 | void |
8e7895b8 | 653 | channel_set_fds(int id, int rfd, int wfd, int efd, |
654 | int extusage, int nonblock) | |
8efc0c15 | 655 | { |
8e7895b8 | 656 | Channel *c = channel_lookup(id); |
657 | if (c == NULL || c->type != SSH_CHANNEL_LARVAL) | |
658 | fatal("channel_activate for non-larval channel %d.", id); | |
659 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock); | |
660 | c->type = SSH_CHANNEL_OPEN; | |
661 | /* XXX window size? */ | |
662 | c->local_window = c->local_window_max = c->local_maxpacket * 2; | |
663 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); | |
664 | packet_put_int(c->remote_id); | |
665 | packet_put_int(c->local_window); | |
666 | packet_send(); | |
8efc0c15 | 667 | } |
668 | ||
aa3378df | 669 | /* |
7368a6c8 | 670 | * 'channel_pre*' are called just before select() to add any bits relevant to |
671 | * channels in the select bitmasks. | |
aa3378df | 672 | */ |
7368a6c8 | 673 | /* |
674 | * 'channel_post*': perform any appropriate operations for channels which | |
675 | * have events pending. | |
676 | */ | |
677 | typedef void chan_fn(Channel *c, fd_set * readset, fd_set * writeset); | |
678 | chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE]; | |
679 | chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE]; | |
8efc0c15 | 680 | |
396c147e | 681 | static void |
7368a6c8 | 682 | channel_pre_listener(Channel *c, fd_set * readset, fd_set * writeset) |
8efc0c15 | 683 | { |
7368a6c8 | 684 | FD_SET(c->sock, readset); |
685 | } | |
5260325f | 686 | |
396c147e | 687 | static void |
97fb6912 | 688 | channel_pre_connecting(Channel *c, fd_set * readset, fd_set * writeset) |
689 | { | |
690 | debug3("channel %d: waiting for connection", c->self); | |
691 | FD_SET(c->sock, writeset); | |
692 | } | |
693 | ||
396c147e | 694 | static void |
7368a6c8 | 695 | channel_pre_open_13(Channel *c, fd_set * readset, fd_set * writeset) |
696 | { | |
697 | if (buffer_len(&c->input) < packet_get_maxsize()) | |
698 | FD_SET(c->sock, readset); | |
699 | if (buffer_len(&c->output) > 0) | |
700 | FD_SET(c->sock, writeset); | |
701 | } | |
5260325f | 702 | |
396c147e | 703 | static void |
7368a6c8 | 704 | channel_pre_open_15(Channel *c, fd_set * readset, fd_set * writeset) |
705 | { | |
706 | /* test whether sockets are 'alive' for read/write */ | |
707 | if (c->istate == CHAN_INPUT_OPEN) | |
708 | if (buffer_len(&c->input) < packet_get_maxsize()) | |
709 | FD_SET(c->sock, readset); | |
710 | if (c->ostate == CHAN_OUTPUT_OPEN || | |
711 | c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { | |
712 | if (buffer_len(&c->output) > 0) { | |
713 | FD_SET(c->sock, writeset); | |
714 | } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { | |
715 | chan_obuf_empty(c); | |
716 | } | |
717 | } | |
718 | } | |
5260325f | 719 | |
396c147e | 720 | static void |
7e7327a1 | 721 | channel_pre_open_20(Channel *c, fd_set * readset, fd_set * writeset) |
722 | { | |
723 | if (c->istate == CHAN_INPUT_OPEN && | |
724 | c->remote_window > 0 && | |
725 | buffer_len(&c->input) < c->remote_window) | |
726 | FD_SET(c->rfd, readset); | |
727 | if (c->ostate == CHAN_OUTPUT_OPEN || | |
728 | c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { | |
729 | if (buffer_len(&c->output) > 0) { | |
730 | FD_SET(c->wfd, writeset); | |
731 | } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { | |
732 | chan_obuf_empty(c); | |
733 | } | |
734 | } | |
735 | /** XXX check close conditions, too */ | |
736 | if (c->efd != -1) { | |
737 | if (c->extended_usage == CHAN_EXTENDED_WRITE && | |
738 | buffer_len(&c->extended) > 0) | |
739 | FD_SET(c->efd, writeset); | |
740 | else if (c->extended_usage == CHAN_EXTENDED_READ && | |
741 | buffer_len(&c->extended) < c->remote_window) | |
742 | FD_SET(c->efd, readset); | |
743 | } | |
744 | } | |
745 | ||
396c147e | 746 | static void |
7368a6c8 | 747 | channel_pre_input_draining(Channel *c, fd_set * readset, fd_set * writeset) |
748 | { | |
749 | if (buffer_len(&c->input) == 0) { | |
750 | packet_start(SSH_MSG_CHANNEL_CLOSE); | |
751 | packet_put_int(c->remote_id); | |
752 | packet_send(); | |
753 | c->type = SSH_CHANNEL_CLOSED; | |
070adba2 | 754 | debug("channel %d: closing after input drain.", c->self); |
7368a6c8 | 755 | } |
756 | } | |
5260325f | 757 | |
396c147e | 758 | static void |
7368a6c8 | 759 | channel_pre_output_draining(Channel *c, fd_set * readset, fd_set * writeset) |
760 | { | |
761 | if (buffer_len(&c->output) == 0) | |
719fc62f | 762 | chan_mark_dead(c); |
6ae2364d | 763 | else |
7368a6c8 | 764 | FD_SET(c->sock, writeset); |
765 | } | |
5260325f | 766 | |
7368a6c8 | 767 | /* |
768 | * This is a special state for X11 authentication spoofing. An opened X11 | |
769 | * connection (when authentication spoofing is being done) remains in this | |
770 | * state until the first packet has been completely read. The authentication | |
771 | * data in that packet is then substituted by the real data if it matches the | |
772 | * fake data, and the channel is put into normal mode. | |
0b242b12 | 773 | * XXX All this happens at the client side. |
8e7895b8 | 774 | * Returns: 0 = need more data, -1 = wrong cookie, 1 = ok |
7368a6c8 | 775 | */ |
396c147e | 776 | static int |
8e7895b8 | 777 | x11_open_helper(Buffer *b) |
7368a6c8 | 778 | { |
1e3b8b07 | 779 | u_char *ucp; |
780 | u_int proto_len, data_len; | |
5260325f | 781 | |
7368a6c8 | 782 | /* Check if the fixed size part of the packet is in buffer. */ |
8e7895b8 | 783 | if (buffer_len(b) < 12) |
7368a6c8 | 784 | return 0; |
785 | ||
786 | /* Parse the lengths of variable-length fields. */ | |
8e7895b8 | 787 | ucp = (u_char *) buffer_ptr(b); |
7368a6c8 | 788 | if (ucp[0] == 0x42) { /* Byte order MSB first. */ |
789 | proto_len = 256 * ucp[6] + ucp[7]; | |
790 | data_len = 256 * ucp[8] + ucp[9]; | |
791 | } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */ | |
792 | proto_len = ucp[6] + 256 * ucp[7]; | |
793 | data_len = ucp[8] + 256 * ucp[9]; | |
794 | } else { | |
795 | debug("Initial X11 packet contains bad byte order byte: 0x%x", | |
796 | ucp[0]); | |
797 | return -1; | |
798 | } | |
5260325f | 799 | |
7368a6c8 | 800 | /* Check if the whole packet is in buffer. */ |
8e7895b8 | 801 | if (buffer_len(b) < |
7368a6c8 | 802 | 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3)) |
803 | return 0; | |
5260325f | 804 | |
7368a6c8 | 805 | /* Check if authentication protocol matches. */ |
806 | if (proto_len != strlen(x11_saved_proto) || | |
807 | memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) { | |
808 | debug("X11 connection uses different authentication protocol."); | |
809 | return -1; | |
810 | } | |
811 | /* Check if authentication data matches our fake data. */ | |
812 | if (data_len != x11_fake_data_len || | |
813 | memcmp(ucp + 12 + ((proto_len + 3) & ~3), | |
814 | x11_fake_data, x11_fake_data_len) != 0) { | |
815 | debug("X11 auth data does not match fake data."); | |
816 | return -1; | |
817 | } | |
818 | /* Check fake data length */ | |
819 | if (x11_fake_data_len != x11_saved_data_len) { | |
820 | error("X11 fake_data_len %d != saved_data_len %d", | |
821 | x11_fake_data_len, x11_saved_data_len); | |
822 | return -1; | |
823 | } | |
824 | /* | |
825 | * Received authentication protocol and data match | |
826 | * our fake data. Substitute the fake data with real | |
827 | * data. | |
828 | */ | |
829 | memcpy(ucp + 12 + ((proto_len + 3) & ~3), | |
830 | x11_saved_data, x11_saved_data_len); | |
831 | return 1; | |
832 | } | |
5260325f | 833 | |
396c147e | 834 | static void |
7368a6c8 | 835 | channel_pre_x11_open_13(Channel *c, fd_set * readset, fd_set * writeset) |
836 | { | |
8e7895b8 | 837 | int ret = x11_open_helper(&c->output); |
7368a6c8 | 838 | if (ret == 1) { |
839 | /* Start normal processing for the channel. */ | |
840 | c->type = SSH_CHANNEL_OPEN; | |
a8be9f80 | 841 | channel_pre_open_13(c, readset, writeset); |
7368a6c8 | 842 | } else if (ret == -1) { |
843 | /* | |
844 | * We have received an X11 connection that has bad | |
845 | * authentication information. | |
846 | */ | |
54b974dc | 847 | log("X11 connection rejected because of wrong authentication."); |
7368a6c8 | 848 | buffer_clear(&c->input); |
849 | buffer_clear(&c->output); | |
489aa2e9 | 850 | channel_close_fd(&c->sock); |
7368a6c8 | 851 | c->sock = -1; |
852 | c->type = SSH_CHANNEL_CLOSED; | |
853 | packet_start(SSH_MSG_CHANNEL_CLOSE); | |
854 | packet_put_int(c->remote_id); | |
855 | packet_send(); | |
856 | } | |
857 | } | |
5260325f | 858 | |
396c147e | 859 | static void |
0b242b12 | 860 | channel_pre_x11_open(Channel *c, fd_set * readset, fd_set * writeset) |
7368a6c8 | 861 | { |
8e7895b8 | 862 | int ret = x11_open_helper(&c->output); |
a5f82435 | 863 | |
864 | /* c->force_drain = 1; */ | |
865 | ||
7368a6c8 | 866 | if (ret == 1) { |
867 | c->type = SSH_CHANNEL_OPEN; | |
d0c832f3 | 868 | if (compat20) |
869 | channel_pre_open_20(c, readset, writeset); | |
870 | else | |
871 | channel_pre_open_15(c, readset, writeset); | |
7368a6c8 | 872 | } else if (ret == -1) { |
873 | debug("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate); | |
0b242b12 | 874 | chan_read_failed(c); /** force close? */ |
7368a6c8 | 875 | chan_write_failed(c); |
876 | debug("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate); | |
877 | } | |
878 | } | |
5260325f | 879 | |
28b9cb4d | 880 | /* try to decode a socks4 header */ |
396c147e | 881 | static int |
28b9cb4d | 882 | channel_decode_socks4(Channel *c, fd_set * readset, fd_set * writeset) |
0490e609 | 883 | { |
884 | u_char *p, *host; | |
53b8fe68 | 885 | int len, have, i, found; |
28b9cb4d | 886 | char username[256]; |
0490e609 | 887 | struct { |
888 | u_int8_t version; | |
889 | u_int8_t command; | |
890 | u_int16_t dest_port; | |
28b9cb4d | 891 | struct in_addr dest_addr; |
0490e609 | 892 | } s4_req, s4_rsp; |
893 | ||
28b9cb4d | 894 | debug2("channel %d: decode socks4", c->self); |
53b8fe68 | 895 | |
896 | have = buffer_len(&c->input); | |
897 | len = sizeof(s4_req); | |
898 | if (have < len) | |
899 | return 0; | |
900 | p = buffer_ptr(&c->input); | |
901 | for (found = 0, i = len; i < have; i++) { | |
902 | if (p[i] == '\0') { | |
903 | found = 1; | |
904 | break; | |
905 | } | |
906 | if (i > 1024) { | |
907 | /* the peer is probably sending garbage */ | |
908 | debug("channel %d: decode socks4: too long", | |
909 | c->self); | |
910 | return -1; | |
911 | } | |
912 | } | |
913 | if (!found) | |
914 | return 0; | |
0490e609 | 915 | buffer_get(&c->input, (char *)&s4_req.version, 1); |
916 | buffer_get(&c->input, (char *)&s4_req.command, 1); | |
917 | buffer_get(&c->input, (char *)&s4_req.dest_port, 2); | |
28b9cb4d | 918 | buffer_get(&c->input, (char *)&s4_req.dest_addr, 4); |
53b8fe68 | 919 | have = buffer_len(&c->input); |
0490e609 | 920 | p = buffer_ptr(&c->input); |
921 | len = strlen(p); | |
6683b40f | 922 | debug2("channel %d: decode socks4: user %s/%d", c->self, p, len); |
0490e609 | 923 | if (len > have) |
28b9cb4d | 924 | fatal("channel %d: decode socks4: len %d > have %d", |
0490e609 | 925 | c->self, len, have); |
926 | strlcpy(username, p, sizeof(username)); | |
927 | buffer_consume(&c->input, len); | |
928 | buffer_consume(&c->input, 1); /* trailing '\0' */ | |
929 | ||
28b9cb4d | 930 | host = inet_ntoa(s4_req.dest_addr); |
0490e609 | 931 | strlcpy(c->path, host, sizeof(c->path)); |
932 | c->host_port = ntohs(s4_req.dest_port); | |
933 | ||
6683b40f | 934 | debug("channel %d: dynamic request: socks4 host %s port %u command %u", |
935 | c->self, host, c->host_port, s4_req.command); | |
0490e609 | 936 | |
28b9cb4d | 937 | if (s4_req.command != 1) { |
938 | debug("channel %d: cannot handle: socks4 cn %d", | |
939 | c->self, s4_req.command); | |
940 | return -1; | |
0490e609 | 941 | } |
28b9cb4d | 942 | s4_rsp.version = 0; /* vn: 0 for reply */ |
943 | s4_rsp.command = 90; /* cd: req granted */ | |
0490e609 | 944 | s4_rsp.dest_port = 0; /* ignored */ |
28b9cb4d | 945 | s4_rsp.dest_addr.s_addr = INADDR_ANY; /* ignored */ |
0490e609 | 946 | buffer_append(&c->output, (char *)&s4_rsp, sizeof(s4_rsp)); |
28b9cb4d | 947 | return 1; |
0490e609 | 948 | } |
949 | ||
28b9cb4d | 950 | /* dynamic port forwarding */ |
396c147e | 951 | static void |
28b9cb4d | 952 | channel_pre_dynamic(Channel *c, fd_set * readset, fd_set * writeset) |
953 | { | |
954 | u_char *p; | |
955 | int have, ret; | |
956 | ||
957 | have = buffer_len(&c->input); | |
639cb8ab | 958 | c->delayed = 0; |
28b9cb4d | 959 | debug2("channel %d: pre_dynamic: have %d", c->self, have); |
070adba2 | 960 | /* buffer_dump(&c->input); */ |
28b9cb4d | 961 | /* check if the fixed size part of the packet is in buffer. */ |
962 | if (have < 4) { | |
963 | /* need more */ | |
964 | FD_SET(c->sock, readset); | |
965 | return; | |
966 | } | |
967 | /* try to guess the protocol */ | |
968 | p = buffer_ptr(&c->input); | |
969 | switch (p[0]) { | |
6683b40f | 970 | case 0x04: |
971 | ret = channel_decode_socks4(c, readset, writeset); | |
972 | break; | |
28b9cb4d | 973 | default: |
974 | ret = -1; | |
975 | break; | |
976 | } | |
977 | if (ret < 0) { | |
719fc62f | 978 | chan_mark_dead(c); |
28b9cb4d | 979 | } else if (ret == 0) { |
980 | debug2("channel %d: pre_dynamic: need more", c->self); | |
981 | /* need more */ | |
982 | FD_SET(c->sock, readset); | |
983 | } else { | |
984 | /* switch to the next state */ | |
985 | c->type = SSH_CHANNEL_OPENING; | |
986 | port_open_helper(c, "direct-tcpip"); | |
987 | } | |
988 | } | |
0490e609 | 989 | |
7368a6c8 | 990 | /* This is our fake X11 server socket. */ |
396c147e | 991 | static void |
7368a6c8 | 992 | channel_post_x11_listener(Channel *c, fd_set * readset, fd_set * writeset) |
993 | { | |
719fc62f | 994 | Channel *nc; |
7368a6c8 | 995 | struct sockaddr addr; |
d24631c9 | 996 | int newsock, on = 1; |
7368a6c8 | 997 | socklen_t addrlen; |
865ac82e | 998 | char buf[16384], *remote_ipaddr; |
0b242b12 | 999 | int remote_port; |
7368a6c8 | 1000 | |
1001 | if (FD_ISSET(c->sock, readset)) { | |
1002 | debug("X11 connection requested."); | |
1003 | addrlen = sizeof(addr); | |
1004 | newsock = accept(c->sock, &addr, &addrlen); | |
1005 | if (newsock < 0) { | |
1006 | error("accept: %.100s", strerror(errno)); | |
1007 | return; | |
5260325f | 1008 | } |
d24631c9 | 1009 | if (setsockopt(newsock, IPPROTO_TCP, TCP_NODELAY, &on, |
1010 | sizeof on) == -1) | |
1011 | error("setsockopt TCP_NODELAY: %.100s", | |
1012 | strerror(errno)); | |
865ac82e | 1013 | remote_ipaddr = get_peer_ipaddr(newsock); |
0b242b12 | 1014 | remote_port = get_peer_port(newsock); |
7368a6c8 | 1015 | snprintf(buf, sizeof buf, "X11 connection from %.200s port %d", |
865ac82e | 1016 | remote_ipaddr, remote_port); |
0b242b12 | 1017 | |
719fc62f | 1018 | nc = channel_new("accepted x11 socket", |
0b242b12 | 1019 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
1020 | c->local_window_max, c->local_maxpacket, | |
a22aff1f | 1021 | 0, xstrdup(buf), 1); |
719fc62f | 1022 | if (nc == NULL) { |
1023 | close(newsock); | |
1024 | xfree(remote_ipaddr); | |
1025 | return; | |
1026 | } | |
0b242b12 | 1027 | if (compat20) { |
1028 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1029 | packet_put_cstring("x11"); | |
719fc62f | 1030 | packet_put_int(nc->self); |
0b242b12 | 1031 | packet_put_int(c->local_window_max); |
1032 | packet_put_int(c->local_maxpacket); | |
865ac82e | 1033 | /* originator ipaddr and port */ |
1034 | packet_put_cstring(remote_ipaddr); | |
d0c832f3 | 1035 | if (datafellows & SSH_BUG_X11FWD) { |
1036 | debug("ssh2 x11 bug compat mode"); | |
1037 | } else { | |
1038 | packet_put_int(remote_port); | |
1039 | } | |
0b242b12 | 1040 | packet_send(); |
1041 | } else { | |
1042 | packet_start(SSH_SMSG_X11_OPEN); | |
719fc62f | 1043 | packet_put_int(nc->self); |
8e7895b8 | 1044 | if (packet_get_protocol_flags() & |
1045 | SSH_PROTOFLAG_HOST_IN_FWD_OPEN) | |
449c5ba5 | 1046 | packet_put_cstring(buf); |
0b242b12 | 1047 | packet_send(); |
1048 | } | |
865ac82e | 1049 | xfree(remote_ipaddr); |
8efc0c15 | 1050 | } |
8efc0c15 | 1051 | } |
1052 | ||
396c147e | 1053 | static void |
0490e609 | 1054 | port_open_helper(Channel *c, char *rtype) |
1055 | { | |
1056 | int direct; | |
1057 | char buf[1024]; | |
1058 | char *remote_ipaddr = get_peer_ipaddr(c->sock); | |
1059 | u_short remote_port = get_peer_port(c->sock); | |
1060 | ||
1061 | direct = (strcmp(rtype, "direct-tcpip") == 0); | |
1062 | ||
1063 | snprintf(buf, sizeof buf, | |
1064 | "%s: listening port %d for %.100s port %d, " | |
1065 | "connect from %.200s port %d", | |
1066 | rtype, c->listening_port, c->path, c->host_port, | |
1067 | remote_ipaddr, remote_port); | |
1068 | ||
1069 | xfree(c->remote_name); | |
1070 | c->remote_name = xstrdup(buf); | |
1071 | ||
1072 | if (compat20) { | |
1073 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1074 | packet_put_cstring(rtype); | |
1075 | packet_put_int(c->self); | |
1076 | packet_put_int(c->local_window_max); | |
1077 | packet_put_int(c->local_maxpacket); | |
1078 | if (direct) { | |
1079 | /* target host, port */ | |
1080 | packet_put_cstring(c->path); | |
1081 | packet_put_int(c->host_port); | |
1082 | } else { | |
1083 | /* listen address, port */ | |
1084 | packet_put_cstring(c->path); | |
1085 | packet_put_int(c->listening_port); | |
1086 | } | |
1087 | /* originator host and port */ | |
1088 | packet_put_cstring(remote_ipaddr); | |
1089 | packet_put_int(remote_port); | |
1090 | packet_send(); | |
1091 | } else { | |
1092 | packet_start(SSH_MSG_PORT_OPEN); | |
1093 | packet_put_int(c->self); | |
1094 | packet_put_cstring(c->path); | |
1095 | packet_put_int(c->host_port); | |
8e7895b8 | 1096 | if (packet_get_protocol_flags() & |
1097 | SSH_PROTOFLAG_HOST_IN_FWD_OPEN) | |
0490e609 | 1098 | packet_put_cstring(c->remote_name); |
1099 | packet_send(); | |
1100 | } | |
1101 | xfree(remote_ipaddr); | |
1102 | } | |
1103 | ||
aa3378df | 1104 | /* |
7368a6c8 | 1105 | * This socket is listening for connections to a forwarded TCP/IP port. |
aa3378df | 1106 | */ |
396c147e | 1107 | static void |
7368a6c8 | 1108 | channel_post_port_listener(Channel *c, fd_set * readset, fd_set * writeset) |
1109 | { | |
0490e609 | 1110 | Channel *nc; |
7368a6c8 | 1111 | struct sockaddr addr; |
719fc62f | 1112 | int newsock, nextstate; |
7368a6c8 | 1113 | socklen_t addrlen; |
0490e609 | 1114 | char *rtype; |
fa08c86b | 1115 | |
7368a6c8 | 1116 | if (FD_ISSET(c->sock, readset)) { |
1117 | debug("Connection to port %d forwarding " | |
1118 | "to %.100s port %d requested.", | |
1119 | c->listening_port, c->path, c->host_port); | |
0490e609 | 1120 | |
639cb8ab | 1121 | if (c->type == SSH_CHANNEL_RPORT_LISTENER) { |
1122 | nextstate = SSH_CHANNEL_OPENING; | |
1123 | rtype = "forwarded-tcpip"; | |
1124 | } else { | |
1125 | if (c->host_port == 0) { | |
1126 | nextstate = SSH_CHANNEL_DYNAMIC; | |
f3964cb9 | 1127 | rtype = "dynamic-tcpip"; |
639cb8ab | 1128 | } else { |
1129 | nextstate = SSH_CHANNEL_OPENING; | |
1130 | rtype = "direct-tcpip"; | |
1131 | } | |
1132 | } | |
0490e609 | 1133 | |
7368a6c8 | 1134 | addrlen = sizeof(addr); |
1135 | newsock = accept(c->sock, &addr, &addrlen); | |
1136 | if (newsock < 0) { | |
1137 | error("accept: %.100s", strerror(errno)); | |
1138 | return; | |
1139 | } | |
719fc62f | 1140 | nc = channel_new(rtype, |
0490e609 | 1141 | nextstate, newsock, newsock, -1, |
7368a6c8 | 1142 | c->local_window_max, c->local_maxpacket, |
0490e609 | 1143 | 0, xstrdup(rtype), 1); |
0490e609 | 1144 | if (nc == NULL) { |
719fc62f | 1145 | error("channel_post_port_listener: no new channel:"); |
1146 | close(newsock); | |
0490e609 | 1147 | return; |
7368a6c8 | 1148 | } |
0490e609 | 1149 | nc->listening_port = c->listening_port; |
1150 | nc->host_port = c->host_port; | |
1151 | strlcpy(nc->path, c->path, sizeof(nc->path)); | |
1152 | ||
639cb8ab | 1153 | if (nextstate == SSH_CHANNEL_DYNAMIC) { |
1154 | /* | |
1155 | * do not call the channel_post handler until | |
1156 | * this flag has been reset by a pre-handler. | |
1157 | * otherwise the FD_ISSET calls might overflow | |
1158 | */ | |
1159 | nc->delayed = 1; | |
1160 | } else { | |
0490e609 | 1161 | port_open_helper(nc, rtype); |
639cb8ab | 1162 | } |
7368a6c8 | 1163 | } |
1164 | } | |
8efc0c15 | 1165 | |
7368a6c8 | 1166 | /* |
1167 | * This is the authentication agent socket listening for connections from | |
1168 | * clients. | |
1169 | */ | |
396c147e | 1170 | static void |
7368a6c8 | 1171 | channel_post_auth_listener(Channel *c, fd_set * readset, fd_set * writeset) |
8efc0c15 | 1172 | { |
719fc62f | 1173 | Channel *nc; |
8e7895b8 | 1174 | char *name; |
719fc62f | 1175 | int newsock; |
5260325f | 1176 | struct sockaddr addr; |
48e671d5 | 1177 | socklen_t addrlen; |
5260325f | 1178 | |
7368a6c8 | 1179 | if (FD_ISSET(c->sock, readset)) { |
1180 | addrlen = sizeof(addr); | |
1181 | newsock = accept(c->sock, &addr, &addrlen); | |
1182 | if (newsock < 0) { | |
1183 | error("accept from auth socket: %.100s", strerror(errno)); | |
1184 | return; | |
1185 | } | |
8e7895b8 | 1186 | name = xstrdup("accepted auth socket"); |
719fc62f | 1187 | nc = channel_new("accepted auth socket", |
fa08c86b | 1188 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
1189 | c->local_window_max, c->local_maxpacket, | |
8e7895b8 | 1190 | 0, name, 1); |
719fc62f | 1191 | if (nc == NULL) { |
1192 | error("channel_post_auth_listener: channel_new failed"); | |
8e7895b8 | 1193 | xfree(name); |
719fc62f | 1194 | close(newsock); |
1195 | } | |
fa08c86b | 1196 | if (compat20) { |
1197 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1198 | packet_put_cstring("auth-agent@openssh.com"); | |
719fc62f | 1199 | packet_put_int(nc->self); |
fa08c86b | 1200 | packet_put_int(c->local_window_max); |
1201 | packet_put_int(c->local_maxpacket); | |
1202 | } else { | |
1203 | packet_start(SSH_SMSG_AGENT_OPEN); | |
719fc62f | 1204 | packet_put_int(nc->self); |
fa08c86b | 1205 | } |
7368a6c8 | 1206 | packet_send(); |
1207 | } | |
1208 | } | |
5260325f | 1209 | |
396c147e | 1210 | static void |
97fb6912 | 1211 | channel_post_connecting(Channel *c, fd_set * readset, fd_set * writeset) |
1212 | { | |
d18e0850 | 1213 | int err = 0; |
8ab2cb35 | 1214 | socklen_t sz = sizeof(err); |
d18e0850 | 1215 | |
97fb6912 | 1216 | if (FD_ISSET(c->sock, writeset)) { |
d18e0850 | 1217 | if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, (char *)&err, |
1218 | &sz) < 0) { | |
1219 | err = errno; | |
1220 | error("getsockopt SO_ERROR failed"); | |
1221 | } | |
1222 | if (err == 0) { | |
1223 | debug("channel %d: connected", c->self); | |
1224 | c->type = SSH_CHANNEL_OPEN; | |
1225 | if (compat20) { | |
1226 | packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1227 | packet_put_int(c->remote_id); | |
1228 | packet_put_int(c->self); | |
1229 | packet_put_int(c->local_window); | |
1230 | packet_put_int(c->local_maxpacket); | |
1231 | } else { | |
1232 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1233 | packet_put_int(c->remote_id); | |
1234 | packet_put_int(c->self); | |
1235 | } | |
97fb6912 | 1236 | } else { |
d18e0850 | 1237 | debug("channel %d: not connected: %s", |
1238 | c->self, strerror(err)); | |
1239 | if (compat20) { | |
1240 | packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); | |
1241 | packet_put_int(c->remote_id); | |
1242 | packet_put_int(SSH2_OPEN_CONNECT_FAILED); | |
1243 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { | |
1244 | packet_put_cstring(strerror(err)); | |
1245 | packet_put_cstring(""); | |
1246 | } | |
97fb6912 | 1247 | } else { |
d18e0850 | 1248 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
1249 | packet_put_int(c->remote_id); | |
97fb6912 | 1250 | } |
d18e0850 | 1251 | chan_mark_dead(c); |
97fb6912 | 1252 | } |
d18e0850 | 1253 | packet_send(); |
97fb6912 | 1254 | } |
1255 | } | |
1256 | ||
396c147e | 1257 | static int |
7368a6c8 | 1258 | channel_handle_rfd(Channel *c, fd_set * readset, fd_set * writeset) |
1259 | { | |
1260 | char buf[16*1024]; | |
1261 | int len; | |
1262 | ||
6fd8622b | 1263 | if (c->rfd != -1 && |
7368a6c8 | 1264 | FD_ISSET(c->rfd, readset)) { |
1265 | len = read(c->rfd, buf, sizeof(buf)); | |
0fbe8c74 | 1266 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
1267 | return 1; | |
7368a6c8 | 1268 | if (len <= 0) { |
0b242b12 | 1269 | debug("channel %d: read<=0 rfd %d len %d", |
7368a6c8 | 1270 | c->self, c->rfd, len); |
28b9cb4d | 1271 | if (c->type != SSH_CHANNEL_OPEN) { |
1272 | debug("channel %d: not open", c->self); | |
719fc62f | 1273 | chan_mark_dead(c); |
0490e609 | 1274 | return -1; |
28b9cb4d | 1275 | } else if (compat13) { |
7368a6c8 | 1276 | buffer_consume(&c->output, buffer_len(&c->output)); |
1277 | c->type = SSH_CHANNEL_INPUT_DRAINING; | |
8e7895b8 | 1278 | debug("channel %d: input draining.", c->self); |
7368a6c8 | 1279 | } else { |
1280 | chan_read_failed(c); | |
5260325f | 1281 | } |
7368a6c8 | 1282 | return -1; |
1283 | } | |
6aacefa7 | 1284 | if (c->input_filter != NULL) { |
2e73a022 | 1285 | if (c->input_filter(c, buf, len) == -1) { |
070adba2 | 1286 | debug("channel %d: filter stops", c->self); |
2e73a022 | 1287 | chan_read_failed(c); |
1288 | } | |
1289 | } else { | |
1290 | buffer_append(&c->input, buf, len); | |
1291 | } | |
7368a6c8 | 1292 | } |
1293 | return 1; | |
1294 | } | |
396c147e | 1295 | static int |
7368a6c8 | 1296 | channel_handle_wfd(Channel *c, fd_set * readset, fd_set * writeset) |
1297 | { | |
95ce5599 | 1298 | struct termios tio; |
780a9951 | 1299 | u_char *data; |
1300 | u_int dlen; | |
7368a6c8 | 1301 | int len; |
1302 | ||
1303 | /* Send buffered output data to the socket. */ | |
6fd8622b | 1304 | if (c->wfd != -1 && |
7368a6c8 | 1305 | FD_ISSET(c->wfd, writeset) && |
1306 | buffer_len(&c->output) > 0) { | |
780a9951 | 1307 | data = buffer_ptr(&c->output); |
1308 | dlen = buffer_len(&c->output); | |
1309 | len = write(c->wfd, data, dlen); | |
0fbe8c74 | 1310 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
1311 | return 1; | |
7368a6c8 | 1312 | if (len <= 0) { |
28b9cb4d | 1313 | if (c->type != SSH_CHANNEL_OPEN) { |
1314 | debug("channel %d: not open", c->self); | |
719fc62f | 1315 | chan_mark_dead(c); |
28b9cb4d | 1316 | return -1; |
1317 | } else if (compat13) { | |
7368a6c8 | 1318 | buffer_consume(&c->output, buffer_len(&c->output)); |
8e7895b8 | 1319 | debug("channel %d: input draining.", c->self); |
7368a6c8 | 1320 | c->type = SSH_CHANNEL_INPUT_DRAINING; |
1321 | } else { | |
1322 | chan_write_failed(c); | |
5260325f | 1323 | } |
7368a6c8 | 1324 | return -1; |
1325 | } | |
780a9951 | 1326 | if (compat20 && c->isatty && dlen >= 1 && data[0] != '\r') { |
0ae4fe1d | 1327 | if (tcgetattr(c->wfd, &tio) == 0 && |
1328 | !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) { | |
1329 | /* | |
1330 | * Simulate echo to reduce the impact of | |
355724fc | 1331 | * traffic analysis. We need to match the |
95ce5599 | 1332 | * size of a SSH2_MSG_CHANNEL_DATA message |
1333 | * (4 byte channel id + data) | |
0ae4fe1d | 1334 | */ |
95ce5599 | 1335 | packet_send_ignore(4 + len); |
0ae4fe1d | 1336 | packet_send(); |
0ae4fe1d | 1337 | } |
1338 | } | |
7368a6c8 | 1339 | buffer_consume(&c->output, len); |
7e7327a1 | 1340 | if (compat20 && len > 0) { |
1341 | c->local_consumed += len; | |
1342 | } | |
1343 | } | |
1344 | return 1; | |
1345 | } | |
396c147e | 1346 | static int |
7e7327a1 | 1347 | channel_handle_efd(Channel *c, fd_set * readset, fd_set * writeset) |
1348 | { | |
1349 | char buf[16*1024]; | |
1350 | int len; | |
1351 | ||
8ce64345 | 1352 | /** XXX handle drain efd, too */ |
7e7327a1 | 1353 | if (c->efd != -1) { |
1354 | if (c->extended_usage == CHAN_EXTENDED_WRITE && | |
1355 | FD_ISSET(c->efd, writeset) && | |
1356 | buffer_len(&c->extended) > 0) { | |
1357 | len = write(c->efd, buffer_ptr(&c->extended), | |
1358 | buffer_len(&c->extended)); | |
de273eef | 1359 | debug2("channel %d: written %d to efd %d", |
7e7327a1 | 1360 | c->self, len, c->efd); |
ee55dacf | 1361 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
1362 | return 1; | |
1363 | if (len <= 0) { | |
1364 | debug2("channel %d: closing write-efd %d", | |
1365 | c->self, c->efd); | |
489aa2e9 | 1366 | channel_close_fd(&c->efd); |
ee55dacf | 1367 | } else { |
7e7327a1 | 1368 | buffer_consume(&c->extended, len); |
1369 | c->local_consumed += len; | |
1370 | } | |
1371 | } else if (c->extended_usage == CHAN_EXTENDED_READ && | |
1372 | FD_ISSET(c->efd, readset)) { | |
1373 | len = read(c->efd, buf, sizeof(buf)); | |
de273eef | 1374 | debug2("channel %d: read %d from efd %d", |
7e7327a1 | 1375 | c->self, len, c->efd); |
ee55dacf | 1376 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
1377 | return 1; | |
1378 | if (len <= 0) { | |
1379 | debug2("channel %d: closing read-efd %d", | |
8ce64345 | 1380 | c->self, c->efd); |
489aa2e9 | 1381 | channel_close_fd(&c->efd); |
ee55dacf | 1382 | } else { |
7e7327a1 | 1383 | buffer_append(&c->extended, buf, len); |
ee55dacf | 1384 | } |
7e7327a1 | 1385 | } |
1386 | } | |
1387 | return 1; | |
1388 | } | |
396c147e | 1389 | static int |
ee55dacf | 1390 | channel_check_window(Channel *c) |
7e7327a1 | 1391 | { |
28b9cb4d | 1392 | if (c->type == SSH_CHANNEL_OPEN && |
1393 | !(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) && | |
7e7327a1 | 1394 | c->local_window < c->local_window_max/2 && |
1395 | c->local_consumed > 0) { | |
1396 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); | |
1397 | packet_put_int(c->remote_id); | |
1398 | packet_put_int(c->local_consumed); | |
1399 | packet_send(); | |
de273eef | 1400 | debug2("channel %d: window %d sent adjust %d", |
7e7327a1 | 1401 | c->self, c->local_window, |
1402 | c->local_consumed); | |
1403 | c->local_window += c->local_consumed; | |
1404 | c->local_consumed = 0; | |
7368a6c8 | 1405 | } |
1406 | return 1; | |
1407 | } | |
5260325f | 1408 | |
396c147e | 1409 | static void |
7368a6c8 | 1410 | channel_post_open_1(Channel *c, fd_set * readset, fd_set * writeset) |
1411 | { | |
639cb8ab | 1412 | if (c->delayed) |
1413 | return; | |
7368a6c8 | 1414 | channel_handle_rfd(c, readset, writeset); |
1415 | channel_handle_wfd(c, readset, writeset); | |
1416 | } | |
aa3378df | 1417 | |
396c147e | 1418 | static void |
7e7327a1 | 1419 | channel_post_open_2(Channel *c, fd_set * readset, fd_set * writeset) |
1420 | { | |
639cb8ab | 1421 | if (c->delayed) |
1422 | return; | |
7e7327a1 | 1423 | channel_handle_rfd(c, readset, writeset); |
1424 | channel_handle_wfd(c, readset, writeset); | |
1425 | channel_handle_efd(c, readset, writeset); | |
ee55dacf | 1426 | |
1427 | channel_check_window(c); | |
7e7327a1 | 1428 | } |
1429 | ||
396c147e | 1430 | static void |
7368a6c8 | 1431 | channel_post_output_drain_13(Channel *c, fd_set * readset, fd_set * writeset) |
1432 | { | |
1433 | int len; | |
1434 | /* Send buffered output data to the socket. */ | |
1435 | if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) { | |
1436 | len = write(c->sock, buffer_ptr(&c->output), | |
1437 | buffer_len(&c->output)); | |
1438 | if (len <= 0) | |
1439 | buffer_consume(&c->output, buffer_len(&c->output)); | |
1440 | else | |
1441 | buffer_consume(&c->output, len); | |
1442 | } | |
1443 | } | |
5260325f | 1444 | |
396c147e | 1445 | static void |
7e7327a1 | 1446 | channel_handler_init_20(void) |
1447 | { | |
1448 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_20; | |
0b242b12 | 1449 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
7e7327a1 | 1450 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; |
fa08c86b | 1451 | channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener; |
0b242b12 | 1452 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
fa08c86b | 1453 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; |
97fb6912 | 1454 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1455 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7e7327a1 | 1456 | |
1457 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open_2; | |
1458 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; | |
fa08c86b | 1459 | channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener; |
0b242b12 | 1460 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
fa08c86b | 1461 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; |
97fb6912 | 1462 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
28b9cb4d | 1463 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open_2; |
7e7327a1 | 1464 | } |
1465 | ||
396c147e | 1466 | static void |
7368a6c8 | 1467 | channel_handler_init_13(void) |
1468 | { | |
1469 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13; | |
1470 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_13; | |
1471 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; | |
1472 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; | |
1473 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; | |
1474 | channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining; | |
1475 | channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining; | |
97fb6912 | 1476 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1477 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7368a6c8 | 1478 | |
1479 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open_1; | |
1480 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; | |
1481 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; | |
1482 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; | |
1483 | channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13; | |
97fb6912 | 1484 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
28b9cb4d | 1485 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open_1; |
7368a6c8 | 1486 | } |
5260325f | 1487 | |
396c147e | 1488 | static void |
7368a6c8 | 1489 | channel_handler_init_15(void) |
1490 | { | |
1491 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_15; | |
0b242b12 | 1492 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
7368a6c8 | 1493 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
1494 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; | |
1495 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; | |
97fb6912 | 1496 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1497 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7368a6c8 | 1498 | |
1499 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; | |
1500 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; | |
1501 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; | |
1502 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open_1; | |
97fb6912 | 1503 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
28b9cb4d | 1504 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open_1; |
7368a6c8 | 1505 | } |
1506 | ||
396c147e | 1507 | static void |
7368a6c8 | 1508 | channel_handler_init(void) |
1509 | { | |
1510 | int i; | |
1511 | for(i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) { | |
1512 | channel_pre[i] = NULL; | |
1513 | channel_post[i] = NULL; | |
1514 | } | |
7e7327a1 | 1515 | if (compat20) |
1516 | channel_handler_init_20(); | |
1517 | else if (compat13) | |
7368a6c8 | 1518 | channel_handler_init_13(); |
1519 | else | |
1520 | channel_handler_init_15(); | |
1521 | } | |
1522 | ||
418e724c | 1523 | /* gc dead channels */ |
1524 | static void | |
1525 | channel_garbage_collect(Channel *c) | |
1526 | { | |
1527 | if (c == NULL) | |
1528 | return; | |
1529 | if (c->detach_user != NULL) { | |
1530 | if (!chan_is_dead(c, 0)) | |
1531 | return; | |
1532 | debug("channel %d: gc: notify user", c->self); | |
1533 | c->detach_user(c->self, NULL); | |
1534 | /* if we still have a callback */ | |
1535 | if (c->detach_user != NULL) | |
1536 | return; | |
1537 | debug("channel %d: gc: user detached", c->self); | |
1538 | } | |
1539 | if (!chan_is_dead(c, 1)) | |
1540 | return; | |
1541 | debug("channel %d: garbage collecting", c->self); | |
1542 | channel_free(c); | |
1543 | } | |
1544 | ||
396c147e | 1545 | static void |
7368a6c8 | 1546 | channel_handler(chan_fn *ftab[], fd_set * readset, fd_set * writeset) |
1547 | { | |
1548 | static int did_init = 0; | |
1549 | int i; | |
1550 | Channel *c; | |
1551 | ||
1552 | if (!did_init) { | |
1553 | channel_handler_init(); | |
1554 | did_init = 1; | |
1555 | } | |
1556 | for (i = 0; i < channels_alloc; i++) { | |
719fc62f | 1557 | c = channels[i]; |
1558 | if (c == NULL) | |
5260325f | 1559 | continue; |
6fd8622b | 1560 | if (ftab[c->type] != NULL) |
1561 | (*ftab[c->type])(c, readset, writeset); | |
418e724c | 1562 | channel_garbage_collect(c); |
8efc0c15 | 1563 | } |
8efc0c15 | 1564 | } |
1565 | ||
8e7895b8 | 1566 | /* |
1567 | * Allocate/update select bitmasks and add any bits relevant to channels in | |
1568 | * select bitmasks. | |
1569 | */ | |
6ae2364d | 1570 | void |
c422989b | 1571 | channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp, |
489aa2e9 | 1572 | int *nallocp, int rekeying) |
7368a6c8 | 1573 | { |
39929cdb | 1574 | int n; |
1575 | u_int sz; | |
1576 | ||
1577 | n = MAX(*maxfdp, channel_max_fd); | |
1578 | ||
1579 | sz = howmany(n+1, NFDBITS) * sizeof(fd_mask); | |
489aa2e9 | 1580 | /* perhaps check sz < nalloc/2 and shrink? */ |
1581 | if (*readsetp == NULL || sz > *nallocp) { | |
1582 | *readsetp = xrealloc(*readsetp, sz); | |
1583 | *writesetp = xrealloc(*writesetp, sz); | |
1584 | *nallocp = sz; | |
39929cdb | 1585 | } |
489aa2e9 | 1586 | *maxfdp = n; |
39929cdb | 1587 | memset(*readsetp, 0, sz); |
1588 | memset(*writesetp, 0, sz); | |
1589 | ||
c422989b | 1590 | if (!rekeying) |
1591 | channel_handler(channel_pre, *readsetp, *writesetp); | |
7368a6c8 | 1592 | } |
1593 | ||
8e7895b8 | 1594 | /* |
1595 | * After select, perform any appropriate operations for channels which have | |
1596 | * events pending. | |
1597 | */ | |
6ae2364d | 1598 | void |
7368a6c8 | 1599 | channel_after_select(fd_set * readset, fd_set * writeset) |
1600 | { | |
1601 | channel_handler(channel_post, readset, writeset); | |
1602 | } | |
1603 | ||
8e7895b8 | 1604 | |
39929cdb | 1605 | /* If there is data to send to the connection, enqueue some of it now. */ |
8efc0c15 | 1606 | |
6ae2364d | 1607 | void |
d5bb9418 | 1608 | channel_output_poll(void) |
8efc0c15 | 1609 | { |
5260325f | 1610 | int len, i; |
7368a6c8 | 1611 | Channel *c; |
5260325f | 1612 | |
1613 | for (i = 0; i < channels_alloc; i++) { | |
719fc62f | 1614 | c = channels[i]; |
1615 | if (c == NULL) | |
1616 | continue; | |
48e671d5 | 1617 | |
8e7895b8 | 1618 | /* |
1619 | * We are only interested in channels that can have buffered | |
1620 | * incoming data. | |
1621 | */ | |
48e671d5 | 1622 | if (compat13) { |
7368a6c8 | 1623 | if (c->type != SSH_CHANNEL_OPEN && |
1624 | c->type != SSH_CHANNEL_INPUT_DRAINING) | |
48e671d5 | 1625 | continue; |
1626 | } else { | |
7368a6c8 | 1627 | if (c->type != SSH_CHANNEL_OPEN) |
48e671d5 | 1628 | continue; |
48e671d5 | 1629 | } |
e78a59f5 | 1630 | if (compat20 && |
1631 | (c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) { | |
ee55dacf | 1632 | /* XXX is this true? */ |
418e724c | 1633 | debug3("channel %d: will not send data after close", c->self); |
7e7327a1 | 1634 | continue; |
1635 | } | |
5260325f | 1636 | |
1637 | /* Get the amount of buffered data for this channel. */ | |
ee55dacf | 1638 | if ((c->istate == CHAN_INPUT_OPEN || |
1639 | c->istate == CHAN_INPUT_WAIT_DRAIN) && | |
1640 | (len = buffer_len(&c->input)) > 0) { | |
8e7895b8 | 1641 | /* |
1642 | * Send some data for the other side over the secure | |
1643 | * connection. | |
1644 | */ | |
7e7327a1 | 1645 | if (compat20) { |
1646 | if (len > c->remote_window) | |
1647 | len = c->remote_window; | |
1648 | if (len > c->remote_maxpacket) | |
1649 | len = c->remote_maxpacket; | |
5260325f | 1650 | } else { |
7e7327a1 | 1651 | if (packet_is_interactive()) { |
1652 | if (len > 1024) | |
1653 | len = 512; | |
1654 | } else { | |
1655 | /* Keep the packets at reasonable size. */ | |
1656 | if (len > packet_get_maxsize()/2) | |
1657 | len = packet_get_maxsize()/2; | |
1658 | } | |
5260325f | 1659 | } |
7368a6c8 | 1660 | if (len > 0) { |
7e7327a1 | 1661 | packet_start(compat20 ? |
1662 | SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA); | |
7368a6c8 | 1663 | packet_put_int(c->remote_id); |
1664 | packet_put_string(buffer_ptr(&c->input), len); | |
1665 | packet_send(); | |
1666 | buffer_consume(&c->input, len); | |
1667 | c->remote_window -= len; | |
7368a6c8 | 1668 | } |
1669 | } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) { | |
5260325f | 1670 | if (compat13) |
1671 | fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3"); | |
aa3378df | 1672 | /* |
1673 | * input-buffer is empty and read-socket shutdown: | |
1674 | * tell peer, that we will not send more data: send IEOF | |
1675 | */ | |
7368a6c8 | 1676 | chan_ibuf_empty(c); |
5260325f | 1677 | } |
7e7327a1 | 1678 | /* Send extended data, i.e. stderr */ |
1679 | if (compat20 && | |
1680 | c->remote_window > 0 && | |
1681 | (len = buffer_len(&c->extended)) > 0 && | |
1682 | c->extended_usage == CHAN_EXTENDED_READ) { | |
ee55dacf | 1683 | debug2("channel %d: rwin %d elen %d euse %d", |
1684 | c->self, c->remote_window, buffer_len(&c->extended), | |
1685 | c->extended_usage); | |
7e7327a1 | 1686 | if (len > c->remote_window) |
1687 | len = c->remote_window; | |
1688 | if (len > c->remote_maxpacket) | |
1689 | len = c->remote_maxpacket; | |
1690 | packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA); | |
1691 | packet_put_int(c->remote_id); | |
1692 | packet_put_int(SSH2_EXTENDED_DATA_STDERR); | |
1693 | packet_put_string(buffer_ptr(&c->extended), len); | |
1694 | packet_send(); | |
1695 | buffer_consume(&c->extended, len); | |
1696 | c->remote_window -= len; | |
ee55dacf | 1697 | debug2("channel %d: sent ext data %d", c->self, len); |
7e7327a1 | 1698 | } |
8efc0c15 | 1699 | } |
8efc0c15 | 1700 | } |
1701 | ||
8e7895b8 | 1702 | |
1703 | /* -- protocol input */ | |
8efc0c15 | 1704 | |
6ae2364d | 1705 | void |
188adeb2 | 1706 | channel_input_data(int type, int plen, void *ctxt) |
8efc0c15 | 1707 | { |
48e671d5 | 1708 | int id; |
5260325f | 1709 | char *data; |
1e3b8b07 | 1710 | u_int data_len; |
7368a6c8 | 1711 | Channel *c; |
5260325f | 1712 | |
1713 | /* Get the channel number and verify it. */ | |
48e671d5 | 1714 | id = packet_get_int(); |
7368a6c8 | 1715 | c = channel_lookup(id); |
1716 | if (c == NULL) | |
48e671d5 | 1717 | packet_disconnect("Received data for nonexistent channel %d.", id); |
5260325f | 1718 | |
1719 | /* Ignore any data for non-open channels (might happen on close) */ | |
7368a6c8 | 1720 | if (c->type != SSH_CHANNEL_OPEN && |
1721 | c->type != SSH_CHANNEL_X11_OPEN) | |
48e671d5 | 1722 | return; |
1723 | ||
1724 | /* same for protocol 1.5 if output end is no longer open */ | |
7368a6c8 | 1725 | if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN) |
5260325f | 1726 | return; |
1727 | ||
1728 | /* Get the data. */ | |
1729 | data = packet_get_string(&data_len); | |
6ae2364d | 1730 | packet_done(); |
7368a6c8 | 1731 | |
6aacefa7 | 1732 | if (compat20) { |
7e7327a1 | 1733 | if (data_len > c->local_maxpacket) { |
1734 | log("channel %d: rcvd big packet %d, maxpack %d", | |
1735 | c->self, data_len, c->local_maxpacket); | |
1736 | } | |
1737 | if (data_len > c->local_window) { | |
1738 | log("channel %d: rcvd too much data %d, win %d", | |
1739 | c->self, data_len, c->local_window); | |
1740 | xfree(data); | |
1741 | return; | |
1742 | } | |
1743 | c->local_window -= data_len; | |
1744 | }else{ | |
1745 | packet_integrity_check(plen, 4 + 4 + data_len, type); | |
1746 | } | |
7368a6c8 | 1747 | buffer_append(&c->output, data, data_len); |
5260325f | 1748 | xfree(data); |
8efc0c15 | 1749 | } |
8e7895b8 | 1750 | |
6ae2364d | 1751 | void |
188adeb2 | 1752 | channel_input_extended_data(int type, int plen, void *ctxt) |
7e7327a1 | 1753 | { |
1754 | int id; | |
1755 | int tcode; | |
1756 | char *data; | |
1e3b8b07 | 1757 | u_int data_len; |
7e7327a1 | 1758 | Channel *c; |
1759 | ||
1760 | /* Get the channel number and verify it. */ | |
1761 | id = packet_get_int(); | |
1762 | c = channel_lookup(id); | |
1763 | ||
1764 | if (c == NULL) | |
1765 | packet_disconnect("Received extended_data for bad channel %d.", id); | |
1766 | if (c->type != SSH_CHANNEL_OPEN) { | |
1767 | log("channel %d: ext data for non open", id); | |
1768 | return; | |
1769 | } | |
1770 | tcode = packet_get_int(); | |
1771 | if (c->efd == -1 || | |
1772 | c->extended_usage != CHAN_EXTENDED_WRITE || | |
1773 | tcode != SSH2_EXTENDED_DATA_STDERR) { | |
1774 | log("channel %d: bad ext data", c->self); | |
1775 | return; | |
1776 | } | |
1777 | data = packet_get_string(&data_len); | |
6ae2364d | 1778 | packet_done(); |
7e7327a1 | 1779 | if (data_len > c->local_window) { |
1780 | log("channel %d: rcvd too much extended_data %d, win %d", | |
1781 | c->self, data_len, c->local_window); | |
1782 | xfree(data); | |
1783 | return; | |
1784 | } | |
de273eef | 1785 | debug2("channel %d: rcvd ext data %d", c->self, data_len); |
7e7327a1 | 1786 | c->local_window -= data_len; |
1787 | buffer_append(&c->extended, data, data_len); | |
1788 | xfree(data); | |
1789 | } | |
1790 | ||
6ae2364d | 1791 | void |
188adeb2 | 1792 | channel_input_ieof(int type, int plen, void *ctxt) |
7368a6c8 | 1793 | { |
1794 | int id; | |
1795 | Channel *c; | |
1796 | ||
1797 | packet_integrity_check(plen, 4, type); | |
1798 | ||
1799 | id = packet_get_int(); | |
1800 | c = channel_lookup(id); | |
1801 | if (c == NULL) | |
1802 | packet_disconnect("Received ieof for nonexistent channel %d.", id); | |
1803 | chan_rcvd_ieof(c); | |
a5f82435 | 1804 | |
1805 | /* XXX force input close */ | |
1806 | if (c->force_drain) { | |
1807 | debug("channel %d: FORCE input drain", c->self); | |
1808 | c->istate = CHAN_INPUT_WAIT_DRAIN; | |
1809 | } | |
1810 | ||
7368a6c8 | 1811 | } |
8efc0c15 | 1812 | |
6ae2364d | 1813 | void |
188adeb2 | 1814 | channel_input_close(int type, int plen, void *ctxt) |
8efc0c15 | 1815 | { |
7368a6c8 | 1816 | int id; |
1817 | Channel *c; | |
5260325f | 1818 | |
7368a6c8 | 1819 | packet_integrity_check(plen, 4, type); |
1820 | ||
1821 | id = packet_get_int(); | |
1822 | c = channel_lookup(id); | |
1823 | if (c == NULL) | |
1824 | packet_disconnect("Received close for nonexistent channel %d.", id); | |
aa3378df | 1825 | |
1826 | /* | |
1827 | * Send a confirmation that we have closed the channel and no more | |
1828 | * data is coming for it. | |
1829 | */ | |
5260325f | 1830 | packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION); |
7368a6c8 | 1831 | packet_put_int(c->remote_id); |
5260325f | 1832 | packet_send(); |
1833 | ||
aa3378df | 1834 | /* |
1835 | * If the channel is in closed state, we have sent a close request, | |
1836 | * and the other side will eventually respond with a confirmation. | |
1837 | * Thus, we cannot free the channel here, because then there would be | |
1838 | * no-one to receive the confirmation. The channel gets freed when | |
1839 | * the confirmation arrives. | |
1840 | */ | |
7368a6c8 | 1841 | if (c->type != SSH_CHANNEL_CLOSED) { |
aa3378df | 1842 | /* |
1843 | * Not a closed channel - mark it as draining, which will | |
1844 | * cause it to be freed later. | |
1845 | */ | |
7368a6c8 | 1846 | buffer_consume(&c->input, buffer_len(&c->input)); |
1847 | c->type = SSH_CHANNEL_OUTPUT_DRAINING; | |
5260325f | 1848 | } |
8efc0c15 | 1849 | } |
1850 | ||
7368a6c8 | 1851 | /* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */ |
6ae2364d | 1852 | void |
188adeb2 | 1853 | channel_input_oclose(int type, int plen, void *ctxt) |
8efc0c15 | 1854 | { |
7368a6c8 | 1855 | int id = packet_get_int(); |
1856 | Channel *c = channel_lookup(id); | |
1857 | packet_integrity_check(plen, 4, type); | |
1858 | if (c == NULL) | |
1859 | packet_disconnect("Received oclose for nonexistent channel %d.", id); | |
1860 | chan_rcvd_oclose(c); | |
8efc0c15 | 1861 | } |
1862 | ||
6ae2364d | 1863 | void |
188adeb2 | 1864 | channel_input_close_confirmation(int type, int plen, void *ctxt) |
7368a6c8 | 1865 | { |
1866 | int id = packet_get_int(); | |
1867 | Channel *c = channel_lookup(id); | |
1868 | ||
6ae2364d | 1869 | packet_done(); |
7368a6c8 | 1870 | if (c == NULL) |
1871 | packet_disconnect("Received close confirmation for " | |
1872 | "out-of-range channel %d.", id); | |
1873 | if (c->type != SSH_CHANNEL_CLOSED) | |
1874 | packet_disconnect("Received close confirmation for " | |
1875 | "non-closed channel %d (type %d).", id, c->type); | |
719fc62f | 1876 | channel_free(c); |
7368a6c8 | 1877 | } |
8efc0c15 | 1878 | |
6ae2364d | 1879 | void |
188adeb2 | 1880 | channel_input_open_confirmation(int type, int plen, void *ctxt) |
8efc0c15 | 1881 | { |
7368a6c8 | 1882 | int id, remote_id; |
1883 | Channel *c; | |
5260325f | 1884 | |
7e7327a1 | 1885 | if (!compat20) |
1886 | packet_integrity_check(plen, 4 + 4, type); | |
5260325f | 1887 | |
7368a6c8 | 1888 | id = packet_get_int(); |
1889 | c = channel_lookup(id); | |
5260325f | 1890 | |
7368a6c8 | 1891 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) |
1892 | packet_disconnect("Received open confirmation for " | |
1893 | "non-opening channel %d.", id); | |
1894 | remote_id = packet_get_int(); | |
aa3378df | 1895 | /* Record the remote channel number and mark that the channel is now open. */ |
7368a6c8 | 1896 | c->remote_id = remote_id; |
1897 | c->type = SSH_CHANNEL_OPEN; | |
7e7327a1 | 1898 | |
1899 | if (compat20) { | |
1900 | c->remote_window = packet_get_int(); | |
1901 | c->remote_maxpacket = packet_get_int(); | |
6ae2364d | 1902 | packet_done(); |
7e7327a1 | 1903 | if (c->cb_fn != NULL && c->cb_event == type) { |
de273eef | 1904 | debug2("callback start"); |
7e7327a1 | 1905 | c->cb_fn(c->self, c->cb_arg); |
de273eef | 1906 | debug2("callback done"); |
7e7327a1 | 1907 | } |
1908 | debug("channel %d: open confirm rwindow %d rmax %d", c->self, | |
1909 | c->remote_window, c->remote_maxpacket); | |
1910 | } | |
8efc0c15 | 1911 | } |
1912 | ||
396c147e | 1913 | static char * |
d18e0850 | 1914 | reason2txt(int reason) |
1915 | { | |
6aacefa7 | 1916 | switch (reason) { |
d18e0850 | 1917 | case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED: |
1918 | return "administratively prohibited"; | |
1919 | case SSH2_OPEN_CONNECT_FAILED: | |
1920 | return "connect failed"; | |
1921 | case SSH2_OPEN_UNKNOWN_CHANNEL_TYPE: | |
1922 | return "unknown channel type"; | |
1923 | case SSH2_OPEN_RESOURCE_SHORTAGE: | |
1924 | return "resource shortage"; | |
1925 | } | |
7e8c18e9 | 1926 | return "unknown reason"; |
d18e0850 | 1927 | } |
1928 | ||
6ae2364d | 1929 | void |
188adeb2 | 1930 | channel_input_open_failure(int type, int plen, void *ctxt) |
8efc0c15 | 1931 | { |
02a024dd | 1932 | int id, reason; |
1933 | char *msg = NULL, *lang = NULL; | |
7368a6c8 | 1934 | Channel *c; |
5260325f | 1935 | |
7e7327a1 | 1936 | if (!compat20) |
1937 | packet_integrity_check(plen, 4, type); | |
7368a6c8 | 1938 | |
1939 | id = packet_get_int(); | |
1940 | c = channel_lookup(id); | |
1941 | ||
1942 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) | |
1943 | packet_disconnect("Received open failure for " | |
1944 | "non-opening channel %d.", id); | |
7e7327a1 | 1945 | if (compat20) { |
02a024dd | 1946 | reason = packet_get_int(); |
fbe90f7b | 1947 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { |
02a024dd | 1948 | msg = packet_get_string(NULL); |
1949 | lang = packet_get_string(NULL); | |
1950 | } | |
6ae2364d | 1951 | packet_done(); |
d18e0850 | 1952 | log("channel %d: open failed: %s%s%s", id, |
1953 | reason2txt(reason), msg ? ": ": "", msg ? msg : ""); | |
02a024dd | 1954 | if (msg != NULL) |
1955 | xfree(msg); | |
1956 | if (lang != NULL) | |
1957 | xfree(lang); | |
7e7327a1 | 1958 | } |
5260325f | 1959 | /* Free the channel. This will also close the socket. */ |
719fc62f | 1960 | channel_free(c); |
8efc0c15 | 1961 | } |
1962 | ||
7e7327a1 | 1963 | void |
188adeb2 | 1964 | channel_input_channel_request(int type, int plen, void *ctxt) |
7e7327a1 | 1965 | { |
1966 | int id; | |
1967 | Channel *c; | |
1968 | ||
1969 | id = packet_get_int(); | |
1970 | c = channel_lookup(id); | |
1971 | ||
1972 | if (c == NULL || | |
1973 | (c->type != SSH_CHANNEL_OPEN && c->type != SSH_CHANNEL_LARVAL)) | |
1974 | packet_disconnect("Received request for " | |
1975 | "non-open channel %d.", id); | |
1976 | if (c->cb_fn != NULL && c->cb_event == type) { | |
de273eef | 1977 | debug2("callback start"); |
7e7327a1 | 1978 | c->cb_fn(c->self, c->cb_arg); |
de273eef | 1979 | debug2("callback done"); |
8e7895b8 | 1980 | } else { |
1981 | char *service = packet_get_string(NULL); | |
1982 | debug("channel %d: rcvd request for %s", c->self, service); | |
1983 | debug("cb_fn %p cb_event %d", c->cb_fn , c->cb_event); | |
1984 | xfree(service); | |
719fc62f | 1985 | } |
3ffc6336 | 1986 | } |
1987 | ||
8e7895b8 | 1988 | void |
1989 | channel_input_window_adjust(int type, int plen, void *ctxt) | |
1990 | { | |
1991 | Channel *c; | |
1992 | int id, adjust; | |
3ffc6336 | 1993 | |
8e7895b8 | 1994 | if (!compat20) |
1995 | return; | |
8efc0c15 | 1996 | |
8e7895b8 | 1997 | /* Get the channel number and verify it. */ |
1998 | id = packet_get_int(); | |
1999 | c = channel_lookup(id); | |
2000 | ||
2001 | if (c == NULL || c->type != SSH_CHANNEL_OPEN) { | |
2002 | log("Received window adjust for " | |
2003 | "non-open channel %d.", id); | |
2004 | return; | |
2005 | } | |
2006 | adjust = packet_get_int(); | |
2007 | packet_done(); | |
2008 | debug2("channel %d: rcvd adjust %d", id, adjust); | |
2009 | c->remote_window += adjust; | |
2010 | } | |
2011 | ||
2012 | void | |
2013 | channel_input_port_open(int type, int plen, void *ctxt) | |
8efc0c15 | 2014 | { |
8e7895b8 | 2015 | Channel *c = NULL; |
2016 | u_short host_port; | |
2017 | char *host, *originator_string; | |
2018 | int remote_id, sock = -1; | |
5260325f | 2019 | |
8e7895b8 | 2020 | remote_id = packet_get_int(); |
2021 | host = packet_get_string(NULL); | |
2022 | host_port = packet_get_int(); | |
2023 | ||
2024 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) { | |
2025 | originator_string = packet_get_string(NULL); | |
2026 | } else { | |
2027 | originator_string = xstrdup("unknown (remote did not supply name)"); | |
2028 | } | |
2029 | packet_done(); | |
2030 | sock = channel_connect_to(host, host_port); | |
2031 | if (sock != -1) { | |
2032 | c = channel_new("connected socket", | |
2033 | SSH_CHANNEL_CONNECTING, sock, sock, -1, 0, 0, 0, | |
2034 | originator_string, 1); | |
2035 | if (c == NULL) { | |
2036 | error("channel_input_port_open: channel_new failed"); | |
2037 | close(sock); | |
2038 | } else { | |
2039 | c->remote_id = remote_id; | |
5260325f | 2040 | } |
2041 | } | |
8e7895b8 | 2042 | if (c == NULL) { |
2043 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
2044 | packet_put_int(remote_id); | |
2045 | packet_send(); | |
2046 | } | |
2047 | xfree(host); | |
8efc0c15 | 2048 | } |
2049 | ||
8e7895b8 | 2050 | |
2051 | /* -- tcp forwarding */ | |
2052 | ||
5e4a7219 | 2053 | void |
2054 | channel_set_af(int af) | |
2055 | { | |
2056 | IPv4or6 = af; | |
2057 | } | |
2058 | ||
aa3378df | 2059 | /* |
2060 | * Initiate forwarding of connections to local port "port" through the secure | |
2061 | * channel to host:port from remote side. | |
2062 | */ | |
02a024dd | 2063 | int |
fa08c86b | 2064 | channel_request_local_forwarding(u_short listen_port, const char *host_to_connect, |
2065 | u_short port_to_connect, int gateway_ports) | |
2066 | { | |
02a024dd | 2067 | return channel_request_forwarding( |
fa08c86b | 2068 | NULL, listen_port, |
2069 | host_to_connect, port_to_connect, | |
2070 | gateway_ports, /*remote_fwd*/ 0); | |
2071 | } | |
8efc0c15 | 2072 | |
fa08c86b | 2073 | /* |
2074 | * If 'remote_fwd' is true we have a '-R style' listener for protocol 2 | |
2075 | * (SSH_CHANNEL_RPORT_LISTENER). | |
2076 | */ | |
02a024dd | 2077 | int |
fa08c86b | 2078 | channel_request_forwarding( |
2079 | const char *listen_address, u_short listen_port, | |
2080 | const char *host_to_connect, u_short port_to_connect, | |
2081 | int gateway_ports, int remote_fwd) | |
8efc0c15 | 2082 | { |
719fc62f | 2083 | Channel *c; |
8e7895b8 | 2084 | int success, sock, on = 1, type; |
48e671d5 | 2085 | struct addrinfo hints, *ai, *aitop; |
2086 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; | |
fa08c86b | 2087 | const char *host; |
aa3378df | 2088 | struct linger linger; |
5260325f | 2089 | |
02a024dd | 2090 | success = 0; |
2091 | ||
fa08c86b | 2092 | if (remote_fwd) { |
2093 | host = listen_address; | |
8e7895b8 | 2094 | type = SSH_CHANNEL_RPORT_LISTENER; |
fa08c86b | 2095 | } else { |
2096 | host = host_to_connect; | |
8e7895b8 | 2097 | type = SSH_CHANNEL_PORT_LISTENER; |
fa08c86b | 2098 | } |
2099 | ||
719fc62f | 2100 | if (strlen(host) > SSH_CHANNEL_PATH_LEN - 1) { |
02a024dd | 2101 | error("Forward host name too long."); |
2102 | return success; | |
2103 | } | |
5260325f | 2104 | |
fa08c86b | 2105 | /* XXX listen_address is currently ignored */ |
aa3378df | 2106 | /* |
48e671d5 | 2107 | * getaddrinfo returns a loopback address if the hostname is |
2108 | * set to NULL and hints.ai_flags is not AI_PASSIVE | |
aa3378df | 2109 | */ |
48e671d5 | 2110 | memset(&hints, 0, sizeof(hints)); |
2111 | hints.ai_family = IPv4or6; | |
2112 | hints.ai_flags = gateway_ports ? AI_PASSIVE : 0; | |
2113 | hints.ai_socktype = SOCK_STREAM; | |
fa08c86b | 2114 | snprintf(strport, sizeof strport, "%d", listen_port); |
48e671d5 | 2115 | if (getaddrinfo(NULL, strport, &hints, &aitop) != 0) |
2116 | packet_disconnect("getaddrinfo: fatal error"); | |
2117 | ||
48e671d5 | 2118 | for (ai = aitop; ai; ai = ai->ai_next) { |
2119 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
2120 | continue; | |
2121 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), | |
2122 | strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { | |
fa08c86b | 2123 | error("channel_request_forwarding: getnameinfo failed"); |
48e671d5 | 2124 | continue; |
2125 | } | |
2126 | /* Create a port to listen for the host. */ | |
2127 | sock = socket(ai->ai_family, SOCK_STREAM, 0); | |
2128 | if (sock < 0) { | |
2129 | /* this is no error since kernel may not support ipv6 */ | |
2130 | verbose("socket: %.100s", strerror(errno)); | |
2131 | continue; | |
2132 | } | |
2133 | /* | |
2134 | * Set socket options. We would like the socket to disappear | |
2135 | * as soon as it has been closed for whatever reason. | |
2136 | */ | |
2137 | setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void *)&on, sizeof(on)); | |
2138 | linger.l_onoff = 1; | |
2139 | linger.l_linger = 5; | |
2140 | setsockopt(sock, SOL_SOCKET, SO_LINGER, (void *)&linger, sizeof(linger)); | |
2141 | debug("Local forwarding listening on %s port %s.", ntop, strport); | |
2142 | ||
2143 | /* Bind the socket to the address. */ | |
2144 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { | |
2145 | /* address can be in use ipv6 address is already bound */ | |
16218745 | 2146 | if (!ai->ai_next) |
2147 | error("bind: %.100s", strerror(errno)); | |
2148 | else | |
2149 | verbose("bind: %.100s", strerror(errno)); | |
2b87da3b | 2150 | |
48e671d5 | 2151 | close(sock); |
2152 | continue; | |
2153 | } | |
2154 | /* Start listening for connections on the socket. */ | |
2155 | if (listen(sock, 5) < 0) { | |
2156 | error("listen: %.100s", strerror(errno)); | |
2157 | close(sock); | |
2158 | continue; | |
2159 | } | |
2160 | /* Allocate a channel number for the socket. */ | |
8e7895b8 | 2161 | c = channel_new("port listener", type, sock, sock, -1, |
0b242b12 | 2162 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, |
a22aff1f | 2163 | 0, xstrdup("port listener"), 1); |
719fc62f | 2164 | if (c == NULL) { |
2165 | error("channel_request_forwarding: channel_new failed"); | |
2166 | close(sock); | |
2167 | continue; | |
2168 | } | |
2169 | strlcpy(c->path, host, sizeof(c->path)); | |
2170 | c->host_port = port_to_connect; | |
2171 | c->listening_port = listen_port; | |
48e671d5 | 2172 | success = 1; |
2173 | } | |
2174 | if (success == 0) | |
02a024dd | 2175 | error("channel_request_forwarding: cannot listen to port: %d", |
2176 | listen_port); | |
48e671d5 | 2177 | freeaddrinfo(aitop); |
02a024dd | 2178 | return success; |
5260325f | 2179 | } |
8efc0c15 | 2180 | |
aa3378df | 2181 | /* |
2182 | * Initiate forwarding of connections to port "port" on remote host through | |
2183 | * the secure channel to host:port from local side. | |
2184 | */ | |
8efc0c15 | 2185 | |
6ae2364d | 2186 | void |
fa08c86b | 2187 | channel_request_remote_forwarding(u_short listen_port, |
2188 | const char *host_to_connect, u_short port_to_connect) | |
8efc0c15 | 2189 | { |
fa08c86b | 2190 | int payload_len, type, success = 0; |
2191 | ||
5260325f | 2192 | /* Record locally that connection to this host/port is permitted. */ |
2193 | if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
2194 | fatal("channel_request_remote_forwarding: too many forwards"); | |
2195 | ||
5260325f | 2196 | /* Send the forward request to the remote side. */ |
7e7327a1 | 2197 | if (compat20) { |
2198 | const char *address_to_bind = "0.0.0.0"; | |
2199 | packet_start(SSH2_MSG_GLOBAL_REQUEST); | |
2200 | packet_put_cstring("tcpip-forward"); | |
2201 | packet_put_char(0); /* boolean: want reply */ | |
2202 | packet_put_cstring(address_to_bind); | |
2203 | packet_put_int(listen_port); | |
fa08c86b | 2204 | packet_send(); |
2205 | packet_write_wait(); | |
2206 | /* Assume that server accepts the request */ | |
2207 | success = 1; | |
7e7327a1 | 2208 | } else { |
2209 | packet_start(SSH_CMSG_PORT_FORWARD_REQUEST); | |
7e7327a1 | 2210 | packet_put_int(listen_port); |
d6f24e45 | 2211 | packet_put_cstring(host_to_connect); |
2212 | packet_put_int(port_to_connect); | |
7e7327a1 | 2213 | packet_send(); |
2214 | packet_write_wait(); | |
fa08c86b | 2215 | |
2216 | /* Wait for response from the remote side. */ | |
2217 | type = packet_read(&payload_len); | |
2218 | switch (type) { | |
2219 | case SSH_SMSG_SUCCESS: | |
2220 | success = 1; | |
2221 | break; | |
2222 | case SSH_SMSG_FAILURE: | |
2223 | log("Warning: Server denied remote port forwarding."); | |
2224 | break; | |
2225 | default: | |
2226 | /* Unknown packet */ | |
2227 | packet_disconnect("Protocol error for port forward request:" | |
2228 | "received packet type %d.", type); | |
2229 | } | |
2230 | } | |
2231 | if (success) { | |
2232 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host_to_connect); | |
2233 | permitted_opens[num_permitted_opens].port_to_connect = port_to_connect; | |
2234 | permitted_opens[num_permitted_opens].listen_port = listen_port; | |
2235 | num_permitted_opens++; | |
7e7327a1 | 2236 | } |
8efc0c15 | 2237 | } |
2238 | ||
aa3378df | 2239 | /* |
2240 | * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates | |
2241 | * listening for the port, and sends back a success reply (or disconnect | |
2242 | * message if there was an error). This never returns if there was an error. | |
2243 | */ | |
8efc0c15 | 2244 | |
6ae2364d | 2245 | void |
1d1ffb87 | 2246 | channel_input_port_forward_request(int is_root, int gateway_ports) |
8efc0c15 | 2247 | { |
57112b5a | 2248 | u_short port, host_port; |
5260325f | 2249 | char *hostname; |
2250 | ||
2251 | /* Get arguments from the packet. */ | |
2252 | port = packet_get_int(); | |
2253 | hostname = packet_get_string(NULL); | |
2254 | host_port = packet_get_int(); | |
2255 | ||
3c62e7eb | 2256 | #ifndef HAVE_CYGWIN |
aa3378df | 2257 | /* |
2258 | * Check that an unprivileged user is not trying to forward a | |
2259 | * privileged port. | |
2260 | */ | |
5260325f | 2261 | if (port < IPPORT_RESERVED && !is_root) |
2262 | packet_disconnect("Requested forwarding of port %d but user is not root.", | |
2263 | port); | |
3c62e7eb | 2264 | #endif |
fa08c86b | 2265 | /* Initiate forwarding */ |
1d1ffb87 | 2266 | channel_request_local_forwarding(port, hostname, host_port, gateway_ports); |
5260325f | 2267 | |
2268 | /* Free the argument string. */ | |
2269 | xfree(hostname); | |
8efc0c15 | 2270 | } |
2271 | ||
01794848 | 2272 | /* |
2273 | * Permits opening to any host/port if permitted_opens[] is empty. This is | |
2274 | * usually called by the server, because the user could connect to any port | |
2275 | * anyway, and the server has no way to know but to trust the client anyway. | |
2276 | */ | |
2277 | void | |
d5bb9418 | 2278 | channel_permit_all_opens(void) |
01794848 | 2279 | { |
2280 | if (num_permitted_opens == 0) | |
2281 | all_opens_permitted = 1; | |
2282 | } | |
2283 | ||
cd332296 | 2284 | void |
01794848 | 2285 | channel_add_permitted_opens(char *host, int port) |
2286 | { | |
2287 | if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
2288 | fatal("channel_request_remote_forwarding: too many forwards"); | |
2289 | debug("allow port forwarding to host %s port %d", host, port); | |
2290 | ||
2291 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host); | |
2292 | permitted_opens[num_permitted_opens].port_to_connect = port; | |
2293 | num_permitted_opens++; | |
2294 | ||
2295 | all_opens_permitted = 0; | |
2296 | } | |
2297 | ||
cd332296 | 2298 | void |
01794848 | 2299 | channel_clear_permitted_opens(void) |
2300 | { | |
2301 | int i; | |
2302 | ||
2303 | for (i = 0; i < num_permitted_opens; i++) | |
2304 | xfree(permitted_opens[i].host_to_connect); | |
2305 | num_permitted_opens = 0; | |
2306 | ||
2307 | } | |
2308 | ||
2309 | ||
2310 | /* return socket to remote host, port */ | |
396c147e | 2311 | static int |
01794848 | 2312 | connect_to(const char *host, u_short port) |
8efc0c15 | 2313 | { |
48e671d5 | 2314 | struct addrinfo hints, *ai, *aitop; |
2315 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; | |
2316 | int gaierr; | |
7368a6c8 | 2317 | int sock = -1; |
48e671d5 | 2318 | |
2319 | memset(&hints, 0, sizeof(hints)); | |
2320 | hints.ai_family = IPv4or6; | |
2321 | hints.ai_socktype = SOCK_STREAM; | |
01794848 | 2322 | snprintf(strport, sizeof strport, "%d", port); |
48e671d5 | 2323 | if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) { |
01794848 | 2324 | error("connect_to %.100s: unknown host (%s)", host, |
2325 | gai_strerror(gaierr)); | |
7368a6c8 | 2326 | return -1; |
48e671d5 | 2327 | } |
48e671d5 | 2328 | for (ai = aitop; ai; ai = ai->ai_next) { |
2329 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
2330 | continue; | |
2331 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), | |
2332 | strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { | |
01794848 | 2333 | error("connect_to: getnameinfo failed"); |
48e671d5 | 2334 | continue; |
5260325f | 2335 | } |
48e671d5 | 2336 | sock = socket(ai->ai_family, SOCK_STREAM, 0); |
2337 | if (sock < 0) { | |
2338 | error("socket: %.100s", strerror(errno)); | |
2339 | continue; | |
5260325f | 2340 | } |
eea39c02 | 2341 | if (fcntl(sock, F_SETFL, O_NONBLOCK) < 0) |
97fb6912 | 2342 | fatal("connect_to: F_SETFL: %s", strerror(errno)); |
97fb6912 | 2343 | if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0 && |
2344 | errno != EINPROGRESS) { | |
01794848 | 2345 | error("connect_to %.100s port %s: %.100s", ntop, strport, |
48e671d5 | 2346 | strerror(errno)); |
2347 | close(sock); | |
2b87da3b | 2348 | continue; /* fail -- try next */ |
48e671d5 | 2349 | } |
2350 | break; /* success */ | |
5260325f | 2351 | |
5260325f | 2352 | } |
48e671d5 | 2353 | freeaddrinfo(aitop); |
48e671d5 | 2354 | if (!ai) { |
01794848 | 2355 | error("connect_to %.100s port %d: failed.", host, port); |
7368a6c8 | 2356 | return -1; |
8efc0c15 | 2357 | } |
7368a6c8 | 2358 | /* success */ |
2359 | return sock; | |
2360 | } | |
01794848 | 2361 | |
fa08c86b | 2362 | int |
b3f8a79c | 2363 | channel_connect_by_listen_address(u_short listen_port) |
fa08c86b | 2364 | { |
2365 | int i; | |
01794848 | 2366 | |
fa08c86b | 2367 | for (i = 0; i < num_permitted_opens; i++) |
2368 | if (permitted_opens[i].listen_port == listen_port) | |
01794848 | 2369 | return connect_to( |
fa08c86b | 2370 | permitted_opens[i].host_to_connect, |
2371 | permitted_opens[i].port_to_connect); | |
0b6fbf03 | 2372 | error("WARNING: Server requests forwarding for unknown listen_port %d", |
2373 | listen_port); | |
fa08c86b | 2374 | return -1; |
2375 | } | |
48e671d5 | 2376 | |
01794848 | 2377 | /* Check if connecting to that port is permitted and connect. */ |
2378 | int | |
2379 | channel_connect_to(const char *host, u_short port) | |
2380 | { | |
2381 | int i, permit; | |
2382 | ||
2383 | permit = all_opens_permitted; | |
2384 | if (!permit) { | |
2385 | for (i = 0; i < num_permitted_opens; i++) | |
2386 | if (permitted_opens[i].port_to_connect == port && | |
2387 | strcmp(permitted_opens[i].host_to_connect, host) == 0) | |
2388 | permit = 1; | |
2389 | ||
2390 | } | |
2391 | if (!permit) { | |
2392 | log("Received request to connect to host %.100s port %d, " | |
2393 | "but the request was denied.", host, port); | |
2394 | return -1; | |
2395 | } | |
2396 | return connect_to(host, port); | |
2397 | } | |
2398 | ||
8e7895b8 | 2399 | /* -- X11 forwarding */ |
8efc0c15 | 2400 | |
aa3378df | 2401 | /* |
2402 | * Creates an internet domain socket for listening for X11 connections. | |
2403 | * Returns a suitable value for the DISPLAY variable, or NULL if an error | |
2404 | * occurs. | |
2405 | */ | |
5260325f | 2406 | char * |
95f1eccc | 2407 | x11_create_display_inet(int screen_number, int x11_display_offset) |
8efc0c15 | 2408 | { |
57112b5a | 2409 | int display_number, sock; |
2410 | u_short port; | |
48e671d5 | 2411 | struct addrinfo hints, *ai, *aitop; |
2412 | char strport[NI_MAXSERV]; | |
2413 | int gaierr, n, num_socks = 0, socks[NUM_SOCKS]; | |
2414 | char display[512]; | |
5260325f | 2415 | char hostname[MAXHOSTNAMELEN]; |
2416 | ||
95f1eccc | 2417 | for (display_number = x11_display_offset; |
5260325f | 2418 | display_number < MAX_DISPLAYS; |
2419 | display_number++) { | |
2420 | port = 6000 + display_number; | |
48e671d5 | 2421 | memset(&hints, 0, sizeof(hints)); |
2422 | hints.ai_family = IPv4or6; | |
2423 | hints.ai_flags = AI_PASSIVE; /* XXX loopback only ? */ | |
2424 | hints.ai_socktype = SOCK_STREAM; | |
2425 | snprintf(strport, sizeof strport, "%d", port); | |
2426 | if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) { | |
2427 | error("getaddrinfo: %.100s", gai_strerror(gaierr)); | |
5260325f | 2428 | return NULL; |
2429 | } | |
48e671d5 | 2430 | for (ai = aitop; ai; ai = ai->ai_next) { |
2431 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
2432 | continue; | |
2433 | sock = socket(ai->ai_family, SOCK_STREAM, 0); | |
2434 | if (sock < 0) { | |
4ee81249 | 2435 | if ((errno != EINVAL) && (errno != EAFNOSUPPORT)) { |
80a44451 | 2436 | error("socket: %.100s", strerror(errno)); |
2437 | return NULL; | |
2438 | } else { | |
22d89d24 | 2439 | debug("x11_create_display_inet: Socket family %d not supported", |
2440 | ai->ai_family); | |
80a44451 | 2441 | continue; |
2442 | } | |
48e671d5 | 2443 | } |
2444 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { | |
2445 | debug("bind port %d: %.100s", port, strerror(errno)); | |
48e671d5 | 2446 | close(sock); |
16218745 | 2447 | |
2448 | if (ai->ai_next) | |
2449 | continue; | |
2450 | ||
48e671d5 | 2451 | for (n = 0; n < num_socks; n++) { |
48e671d5 | 2452 | close(socks[n]); |
2453 | } | |
2454 | num_socks = 0; | |
2455 | break; | |
2456 | } | |
2457 | socks[num_socks++] = sock; | |
80faa19f | 2458 | #ifndef DONT_TRY_OTHER_AF |
48e671d5 | 2459 | if (num_socks == NUM_SOCKS) |
2460 | break; | |
80faa19f | 2461 | #else |
2462 | break; | |
2463 | #endif | |
5260325f | 2464 | } |
4ccb01d6 | 2465 | freeaddrinfo(aitop); |
48e671d5 | 2466 | if (num_socks > 0) |
2467 | break; | |
5260325f | 2468 | } |
2469 | if (display_number >= MAX_DISPLAYS) { | |
2470 | error("Failed to allocate internet-domain X11 display socket."); | |
2471 | return NULL; | |
8efc0c15 | 2472 | } |
5260325f | 2473 | /* Start listening for connections on the socket. */ |
48e671d5 | 2474 | for (n = 0; n < num_socks; n++) { |
2475 | sock = socks[n]; | |
2476 | if (listen(sock, 5) < 0) { | |
2477 | error("listen: %.100s", strerror(errno)); | |
48e671d5 | 2478 | close(sock); |
2479 | return NULL; | |
2480 | } | |
8efc0c15 | 2481 | } |
48e671d5 | 2482 | |
5260325f | 2483 | /* Set up a suitable value for the DISPLAY variable. */ |
2484 | if (gethostname(hostname, sizeof(hostname)) < 0) | |
2485 | fatal("gethostname: %.100s", strerror(errno)); | |
a7effaac | 2486 | |
2487 | #ifdef IPADDR_IN_DISPLAY | |
2b87da3b | 2488 | /* |
a7effaac | 2489 | * HPUX detects the local hostname in the DISPLAY variable and tries |
2490 | * to set up a shared memory connection to the server, which it | |
2491 | * incorrectly supposes to be local. | |
2492 | * | |
2493 | * The workaround - as used in later $$H and other programs - is | |
2494 | * is to set display to the host's IP address. | |
2495 | */ | |
2496 | { | |
2497 | struct hostent *he; | |
2498 | struct in_addr my_addr; | |
2499 | ||
2500 | he = gethostbyname(hostname); | |
2501 | if (he == NULL) { | |
2502 | error("[X11-broken-fwd-hostname-workaround] Could not get " | |
2503 | "IP address for hostname %s.", hostname); | |
2504 | ||
2505 | packet_send_debug("[X11-broken-fwd-hostname-workaround]" | |
2506 | "Could not get IP address for hostname %s.", hostname); | |
2507 | ||
2508 | shutdown(sock, SHUT_RDWR); | |
2509 | close(sock); | |
2510 | ||
2511 | return NULL; | |
2512 | } | |
2513 | ||
2514 | memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr)); | |
2515 | ||
2516 | /* Set DISPLAY to <ip address>:screen.display */ | |
2b87da3b | 2517 | snprintf(display, sizeof(display), "%.50s:%d.%d", inet_ntoa(my_addr), |
74141647 | 2518 | display_number, screen_number); |
a7effaac | 2519 | } |
2520 | #else /* IPADDR_IN_DISPLAY */ | |
2521 | /* Just set DISPLAY to hostname:screen.display */ | |
48e671d5 | 2522 | snprintf(display, sizeof display, "%.400s:%d.%d", hostname, |
74141647 | 2523 | display_number, screen_number); |
a7effaac | 2524 | #endif /* IPADDR_IN_DISPLAY */ |
5260325f | 2525 | |
48e671d5 | 2526 | /* Allocate a channel for each socket. */ |
2527 | for (n = 0; n < num_socks; n++) { | |
2528 | sock = socks[n]; | |
0b242b12 | 2529 | (void) channel_new("x11 listener", |
2530 | SSH_CHANNEL_X11_LISTENER, sock, sock, -1, | |
2531 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, | |
a22aff1f | 2532 | 0, xstrdup("X11 inet listener"), 1); |
48e671d5 | 2533 | } |
5260325f | 2534 | |
2535 | /* Return a suitable value for the DISPLAY environment variable. */ | |
48e671d5 | 2536 | return xstrdup(display); |
8efc0c15 | 2537 | } |
2538 | ||
2539 | #ifndef X_UNIX_PATH | |
2540 | #define X_UNIX_PATH "/tmp/.X11-unix/X" | |
2541 | #endif | |
2542 | ||
396c147e | 2543 | static int |
1e3b8b07 | 2544 | connect_local_xsocket(u_int dnr) |
8efc0c15 | 2545 | { |
5260325f | 2546 | static const char *const x_sockets[] = { |
2547 | X_UNIX_PATH "%u", | |
2548 | "/var/X/.X11-unix/X" "%u", | |
2549 | "/usr/spool/sockets/X11/" "%u", | |
2550 | NULL | |
2551 | }; | |
2552 | int sock; | |
2553 | struct sockaddr_un addr; | |
2554 | const char *const * path; | |
2555 | ||
2556 | for (path = x_sockets; *path; ++path) { | |
2557 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
2558 | if (sock < 0) | |
2559 | error("socket: %.100s", strerror(errno)); | |
2560 | memset(&addr, 0, sizeof(addr)); | |
2561 | addr.sun_family = AF_UNIX; | |
2562 | snprintf(addr.sun_path, sizeof addr.sun_path, *path, dnr); | |
2563 | if (connect(sock, (struct sockaddr *) & addr, sizeof(addr)) == 0) | |
2564 | return sock; | |
2565 | close(sock); | |
2566 | } | |
2567 | error("connect %.100s: %.100s", addr.sun_path, strerror(errno)); | |
2568 | return -1; | |
8efc0c15 | 2569 | } |
2570 | ||
0b242b12 | 2571 | int |
2572 | x11_connect_display(void) | |
8efc0c15 | 2573 | { |
d24631c9 | 2574 | int display_number, sock = 0, on = 1; |
5260325f | 2575 | const char *display; |
0b242b12 | 2576 | char buf[1024], *cp; |
48e671d5 | 2577 | struct addrinfo hints, *ai, *aitop; |
2578 | char strport[NI_MAXSERV]; | |
2579 | int gaierr; | |
5260325f | 2580 | |
5260325f | 2581 | /* Try to open a socket for the local X server. */ |
2582 | display = getenv("DISPLAY"); | |
2583 | if (!display) { | |
2584 | error("DISPLAY not set."); | |
0b242b12 | 2585 | return -1; |
5260325f | 2586 | } |
aa3378df | 2587 | /* |
2588 | * Now we decode the value of the DISPLAY variable and make a | |
2589 | * connection to the real X server. | |
2590 | */ | |
2591 | ||
2592 | /* | |
2593 | * Check if it is a unix domain socket. Unix domain displays are in | |
2594 | * one of the following formats: unix:d[.s], :d[.s], ::d[.s] | |
2595 | */ | |
5260325f | 2596 | if (strncmp(display, "unix:", 5) == 0 || |
2597 | display[0] == ':') { | |
2598 | /* Connect to the unix domain socket. */ | |
2599 | if (sscanf(strrchr(display, ':') + 1, "%d", &display_number) != 1) { | |
2600 | error("Could not parse display number from DISPLAY: %.100s", | |
2601 | display); | |
0b242b12 | 2602 | return -1; |
5260325f | 2603 | } |
2604 | /* Create a socket. */ | |
2605 | sock = connect_local_xsocket(display_number); | |
2606 | if (sock < 0) | |
0b242b12 | 2607 | return -1; |
5260325f | 2608 | |
2609 | /* OK, we now have a connection to the display. */ | |
0b242b12 | 2610 | return sock; |
5260325f | 2611 | } |
aa3378df | 2612 | /* |
2613 | * Connect to an inet socket. The DISPLAY value is supposedly | |
2614 | * hostname:d[.s], where hostname may also be numeric IP address. | |
2615 | */ | |
74860245 | 2616 | strlcpy(buf, display, sizeof(buf)); |
5260325f | 2617 | cp = strchr(buf, ':'); |
2618 | if (!cp) { | |
2619 | error("Could not find ':' in DISPLAY: %.100s", display); | |
0b242b12 | 2620 | return -1; |
5260325f | 2621 | } |
2622 | *cp = 0; | |
aa3378df | 2623 | /* buf now contains the host name. But first we parse the display number. */ |
5260325f | 2624 | if (sscanf(cp + 1, "%d", &display_number) != 1) { |
2625 | error("Could not parse display number from DISPLAY: %.100s", | |
2626 | display); | |
0b242b12 | 2627 | return -1; |
5260325f | 2628 | } |
5260325f | 2629 | |
48e671d5 | 2630 | /* Look up the host address */ |
2631 | memset(&hints, 0, sizeof(hints)); | |
2632 | hints.ai_family = IPv4or6; | |
2633 | hints.ai_socktype = SOCK_STREAM; | |
2634 | snprintf(strport, sizeof strport, "%d", 6000 + display_number); | |
2635 | if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) { | |
2636 | error("%.100s: unknown host. (%s)", buf, gai_strerror(gaierr)); | |
0b242b12 | 2637 | return -1; |
8efc0c15 | 2638 | } |
48e671d5 | 2639 | for (ai = aitop; ai; ai = ai->ai_next) { |
2640 | /* Create a socket. */ | |
2641 | sock = socket(ai->ai_family, SOCK_STREAM, 0); | |
2642 | if (sock < 0) { | |
2643 | debug("socket: %.100s", strerror(errno)); | |
7368a6c8 | 2644 | continue; |
2645 | } | |
2646 | /* Connect it to the display. */ | |
2647 | if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) { | |
2648 | debug("connect %.100s port %d: %.100s", buf, | |
2649 | 6000 + display_number, strerror(errno)); | |
2650 | close(sock); | |
2651 | continue; | |
2652 | } | |
2653 | /* Success */ | |
2654 | break; | |
48e671d5 | 2655 | } |
48e671d5 | 2656 | freeaddrinfo(aitop); |
2657 | if (!ai) { | |
6ae2364d | 2658 | error("connect %.100s port %d: %.100s", buf, 6000 + display_number, |
48e671d5 | 2659 | strerror(errno)); |
0b242b12 | 2660 | return -1; |
8efc0c15 | 2661 | } |
d24631c9 | 2662 | if (setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, &on, sizeof on) == -1) |
2663 | error("setsockopt TCP_NODELAY: %.100s", strerror(errno)); | |
0b242b12 | 2664 | return sock; |
2665 | } | |
5260325f | 2666 | |
0b242b12 | 2667 | /* |
2668 | * This is called when SSH_SMSG_X11_OPEN is received. The packet contains | |
2669 | * the remote channel number. We should do whatever we want, and respond | |
2670 | * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE. | |
2671 | */ | |
5260325f | 2672 | |
0b242b12 | 2673 | void |
188adeb2 | 2674 | x11_input_open(int type, int plen, void *ctxt) |
0b242b12 | 2675 | { |
719fc62f | 2676 | Channel *c = NULL; |
2677 | int remote_id, sock = 0; | |
0b242b12 | 2678 | char *remote_host; |
5260325f | 2679 | |
719fc62f | 2680 | debug("Received X11 open request."); |
5260325f | 2681 | |
719fc62f | 2682 | remote_id = packet_get_int(); |
8e7895b8 | 2683 | |
2684 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) { | |
719fc62f | 2685 | remote_host = packet_get_string(NULL); |
0b242b12 | 2686 | } else { |
2687 | remote_host = xstrdup("unknown (remote did not supply name)"); | |
0b242b12 | 2688 | } |
719fc62f | 2689 | packet_done(); |
0b242b12 | 2690 | |
2691 | /* Obtain a connection to the real X display. */ | |
2692 | sock = x11_connect_display(); | |
719fc62f | 2693 | if (sock != -1) { |
2694 | /* Allocate a channel for this connection. */ | |
2695 | c = channel_new("connected x11 socket", | |
2696 | SSH_CHANNEL_X11_OPEN, sock, sock, -1, 0, 0, 0, | |
2697 | remote_host, 1); | |
2698 | if (c == NULL) { | |
2699 | error("x11_input_open: channel_new failed"); | |
2700 | close(sock); | |
2701 | } else { | |
2702 | c->remote_id = remote_id; | |
a5f82435 | 2703 | c->force_drain = 1; |
719fc62f | 2704 | } |
2705 | } | |
2706 | if (c == NULL) { | |
0b242b12 | 2707 | /* Send refusal to the remote host. */ |
2708 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
719fc62f | 2709 | packet_put_int(remote_id); |
0b242b12 | 2710 | } else { |
0b242b12 | 2711 | /* Send a confirmation to the remote host. */ |
2712 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
719fc62f | 2713 | packet_put_int(remote_id); |
2714 | packet_put_int(c->self); | |
0b242b12 | 2715 | } |
719fc62f | 2716 | packet_send(); |
8efc0c15 | 2717 | } |
2718 | ||
a22aff1f | 2719 | /* dummy protocol handler that denies SSH-1 requests (agent/x11) */ |
2720 | void | |
2721 | deny_input_open(int type, int plen, void *ctxt) | |
2722 | { | |
2723 | int rchan = packet_get_int(); | |
6aacefa7 | 2724 | switch (type) { |
a22aff1f | 2725 | case SSH_SMSG_AGENT_OPEN: |
2726 | error("Warning: ssh server tried agent forwarding."); | |
2727 | break; | |
2728 | case SSH_SMSG_X11_OPEN: | |
2729 | error("Warning: ssh server tried X11 forwarding."); | |
2730 | break; | |
2731 | default: | |
2732 | error("deny_input_open: type %d plen %d", type, plen); | |
2733 | break; | |
2734 | } | |
2735 | error("Warning: this is probably a break in attempt by a malicious server."); | |
2736 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
2737 | packet_put_int(rchan); | |
2738 | packet_send(); | |
2739 | } | |
2740 | ||
aa3378df | 2741 | /* |
2742 | * Requests forwarding of X11 connections, generates fake authentication | |
2743 | * data, and enables authentication spoofing. | |
8e7895b8 | 2744 | * This should be called in the client only. |
aa3378df | 2745 | */ |
6ae2364d | 2746 | void |
0b242b12 | 2747 | x11_request_forwarding_with_spoofing(int client_session_id, |
2748 | const char *proto, const char *data) | |
8efc0c15 | 2749 | { |
1e3b8b07 | 2750 | u_int data_len = (u_int) strlen(data) / 2; |
ca910e13 | 2751 | u_int i, value, len; |
5260325f | 2752 | char *new_data; |
2753 | int screen_number; | |
2754 | const char *cp; | |
2755 | u_int32_t rand = 0; | |
2756 | ||
2757 | cp = getenv("DISPLAY"); | |
2758 | if (cp) | |
2759 | cp = strchr(cp, ':'); | |
2760 | if (cp) | |
2761 | cp = strchr(cp, '.'); | |
2762 | if (cp) | |
2763 | screen_number = atoi(cp + 1); | |
2764 | else | |
2765 | screen_number = 0; | |
2766 | ||
2767 | /* Save protocol name. */ | |
2768 | x11_saved_proto = xstrdup(proto); | |
2769 | ||
aa3378df | 2770 | /* |
2771 | * Extract real authentication data and generate fake data of the | |
2772 | * same length. | |
2773 | */ | |
5260325f | 2774 | x11_saved_data = xmalloc(data_len); |
2775 | x11_fake_data = xmalloc(data_len); | |
2776 | for (i = 0; i < data_len; i++) { | |
2777 | if (sscanf(data + 2 * i, "%2x", &value) != 1) | |
2778 | fatal("x11_request_forwarding: bad authentication data: %.100s", data); | |
2779 | if (i % 4 == 0) | |
2780 | rand = arc4random(); | |
2781 | x11_saved_data[i] = value; | |
2782 | x11_fake_data[i] = rand & 0xff; | |
2783 | rand >>= 8; | |
2784 | } | |
2785 | x11_saved_data_len = data_len; | |
2786 | x11_fake_data_len = data_len; | |
2787 | ||
2788 | /* Convert the fake data into hex. */ | |
ca910e13 | 2789 | len = 2 * data_len + 1; |
2790 | new_data = xmalloc(len); | |
5260325f | 2791 | for (i = 0; i < data_len; i++) |
ca910e13 | 2792 | snprintf(new_data + 2 * i, len - 2 * i, |
2793 | "%02x", (u_char) x11_fake_data[i]); | |
5260325f | 2794 | |
2795 | /* Send the request packet. */ | |
0b242b12 | 2796 | if (compat20) { |
2797 | channel_request_start(client_session_id, "x11-req", 0); | |
2798 | packet_put_char(0); /* XXX bool single connection */ | |
2799 | } else { | |
2800 | packet_start(SSH_CMSG_X11_REQUEST_FORWARDING); | |
2801 | } | |
2802 | packet_put_cstring(proto); | |
2803 | packet_put_cstring(new_data); | |
5260325f | 2804 | packet_put_int(screen_number); |
2805 | packet_send(); | |
2806 | packet_write_wait(); | |
2807 | xfree(new_data); | |
8efc0c15 | 2808 | } |
2809 | ||
8e7895b8 | 2810 | |
2811 | /* -- agent forwarding */ | |
2812 | ||
8efc0c15 | 2813 | /* Sends a message to the server to request authentication fd forwarding. */ |
2814 | ||
6ae2364d | 2815 | void |
d5bb9418 | 2816 | auth_request_forwarding(void) |
8efc0c15 | 2817 | { |
5260325f | 2818 | packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING); |
2819 | packet_send(); | |
2820 | packet_write_wait(); | |
8efc0c15 | 2821 | } |
2822 | ||
aa3378df | 2823 | /* |
2824 | * Returns the name of the forwarded authentication socket. Returns NULL if | |
2825 | * there is no forwarded authentication socket. The returned value points to | |
2826 | * a static buffer. | |
2827 | */ | |
8efc0c15 | 2828 | |
5260325f | 2829 | char * |
d5bb9418 | 2830 | auth_get_socket_name(void) |
8efc0c15 | 2831 | { |
8e7895b8 | 2832 | return auth_sock_name; |
8efc0c15 | 2833 | } |
2834 | ||
2835 | /* removes the agent forwarding socket */ | |
2836 | ||
6ae2364d | 2837 | void |
f0f32b8e | 2838 | auth_sock_cleanup_proc(void *_pw) |
5260325f | 2839 | { |
f0f32b8e | 2840 | struct passwd *pw = _pw; |
2841 | ||
e4f7282d | 2842 | if (auth_sock_name) { |
f0f32b8e | 2843 | temporarily_use_uid(pw); |
e4f7282d | 2844 | unlink(auth_sock_name); |
2845 | rmdir(auth_sock_dir); | |
2846 | auth_sock_name = NULL; | |
f0f32b8e | 2847 | restore_uid(); |
e4f7282d | 2848 | } |
8efc0c15 | 2849 | } |
2850 | ||
aa3378df | 2851 | /* |
fa649821 | 2852 | * This is called to process SSH_CMSG_AGENT_REQUEST_FORWARDING on the server. |
aa3378df | 2853 | * This starts forwarding authentication requests. |
2854 | */ | |
8efc0c15 | 2855 | |
fa649821 | 2856 | int |
5260325f | 2857 | auth_input_request_forwarding(struct passwd * pw) |
8efc0c15 | 2858 | { |
719fc62f | 2859 | Channel *nc; |
2860 | int sock; | |
5260325f | 2861 | struct sockaddr_un sunaddr; |
2862 | ||
8e7895b8 | 2863 | if (auth_get_socket_name() != NULL) { |
2864 | error("authentication forwarding requested twice."); | |
2865 | return 0; | |
2866 | } | |
5260325f | 2867 | |
2868 | /* Temporarily drop privileged uid for mkdir/bind. */ | |
63bd8c36 | 2869 | temporarily_use_uid(pw); |
5260325f | 2870 | |
2871 | /* Allocate a buffer for the socket name, and format the name. */ | |
8e7895b8 | 2872 | auth_sock_name = xmalloc(MAXPATHLEN); |
2873 | auth_sock_dir = xmalloc(MAXPATHLEN); | |
2874 | strlcpy(auth_sock_dir, "/tmp/ssh-XXXXXXXX", MAXPATHLEN); | |
5260325f | 2875 | |
2876 | /* Create private directory for socket */ | |
8e7895b8 | 2877 | if (mkdtemp(auth_sock_dir) == NULL) { |
2878 | packet_send_debug("Agent forwarding disabled: " | |
2879 | "mkdtemp() failed: %.100s", strerror(errno)); | |
fa649821 | 2880 | restore_uid(); |
8e7895b8 | 2881 | xfree(auth_sock_name); |
2882 | xfree(auth_sock_dir); | |
2883 | auth_sock_name = NULL; | |
2884 | auth_sock_dir = NULL; | |
fa649821 | 2885 | return 0; |
2886 | } | |
8e7895b8 | 2887 | snprintf(auth_sock_name, MAXPATHLEN, "%s/agent.%d", |
2888 | auth_sock_dir, (int) getpid()); | |
5260325f | 2889 | |
e4f7282d | 2890 | /* delete agent socket on fatal() */ |
f0f32b8e | 2891 | fatal_add_cleanup(auth_sock_cleanup_proc, pw); |
e4f7282d | 2892 | |
5260325f | 2893 | /* Create the socket. */ |
2894 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
2895 | if (sock < 0) | |
2896 | packet_disconnect("socket: %.100s", strerror(errno)); | |
2897 | ||
2898 | /* Bind it to the name. */ | |
2899 | memset(&sunaddr, 0, sizeof(sunaddr)); | |
2900 | sunaddr.sun_family = AF_UNIX; | |
74860245 | 2901 | strlcpy(sunaddr.sun_path, auth_sock_name, sizeof(sunaddr.sun_path)); |
5260325f | 2902 | |
2903 | if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0) | |
2904 | packet_disconnect("bind: %.100s", strerror(errno)); | |
2905 | ||
2906 | /* Restore the privileged uid. */ | |
2907 | restore_uid(); | |
2908 | ||
2909 | /* Start listening on the socket. */ | |
2910 | if (listen(sock, 5) < 0) | |
2911 | packet_disconnect("listen: %.100s", strerror(errno)); | |
2912 | ||
2913 | /* Allocate a channel for the authentication agent socket. */ | |
719fc62f | 2914 | nc = channel_new("auth socket", |
fa08c86b | 2915 | SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1, |
2916 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, | |
2917 | 0, xstrdup("auth socket"), 1); | |
719fc62f | 2918 | if (nc == NULL) { |
2919 | error("auth_input_request_forwarding: channel_new failed"); | |
f0f32b8e | 2920 | auth_sock_cleanup_proc(pw); |
750c256a | 2921 | fatal_remove_cleanup(auth_sock_cleanup_proc, pw); |
719fc62f | 2922 | close(sock); |
2923 | return 0; | |
2924 | } | |
8e7895b8 | 2925 | strlcpy(nc->path, auth_sock_name, sizeof(nc->path)); |
fa649821 | 2926 | return 1; |
8efc0c15 | 2927 | } |
2928 | ||
2929 | /* This is called to process an SSH_SMSG_AGENT_OPEN message. */ | |
2930 | ||
6ae2364d | 2931 | void |
188adeb2 | 2932 | auth_input_open_request(int type, int plen, void *ctxt) |
8efc0c15 | 2933 | { |
719fc62f | 2934 | Channel *c = NULL; |
2935 | int remote_id, sock; | |
8e7895b8 | 2936 | char *name; |
5260325f | 2937 | |
7368a6c8 | 2938 | packet_integrity_check(plen, 4, type); |
2939 | ||
5260325f | 2940 | /* Read the remote channel number from the message. */ |
719fc62f | 2941 | remote_id = packet_get_int(); |
5260325f | 2942 | |
aa3378df | 2943 | /* |
2944 | * Get a connection to the local authentication agent (this may again | |
2945 | * get forwarded). | |
2946 | */ | |
5260325f | 2947 | sock = ssh_get_authentication_socket(); |
2948 | ||
aa3378df | 2949 | /* |
2950 | * If we could not connect the agent, send an error message back to | |
2951 | * the server. This should never happen unless the agent dies, | |
2952 | * because authentication forwarding is only enabled if we have an | |
2953 | * agent. | |
2954 | */ | |
719fc62f | 2955 | if (sock >= 0) { |
8e7895b8 | 2956 | name = xstrdup("authentication agent connection"); |
2957 | c = channel_new("", SSH_CHANNEL_OPEN, sock, sock, | |
2958 | -1, 0, 0, 0, name, 1); | |
719fc62f | 2959 | if (c == NULL) { |
2960 | error("auth_input_open_request: channel_new failed"); | |
8e7895b8 | 2961 | xfree(name); |
719fc62f | 2962 | close(sock); |
2963 | } else { | |
2964 | c->remote_id = remote_id; | |
a5f82435 | 2965 | c->force_drain = 1; |
719fc62f | 2966 | } |
2967 | } | |
2968 | if (c == NULL) { | |
5260325f | 2969 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
719fc62f | 2970 | packet_put_int(remote_id); |
2971 | } else { | |
2972 | /* Send a confirmation to the remote host. */ | |
2973 | debug("Forwarding authentication connection."); | |
2974 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
2975 | packet_put_int(remote_id); | |
2976 | packet_put_int(c->self); | |
5260325f | 2977 | } |
5260325f | 2978 | packet_send(); |
8efc0c15 | 2979 | } |