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69d9d413 | 1 | /* $OpenBSD: channels.c,v 1.250 2006/04/16 00:48:52 djm Exp $ */ |
8efc0c15 | 2 | /* |
5260325f | 3 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
5260325f | 4 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
5 | * All rights reserved | |
5260325f | 6 | * This file contains functions for generic socket connection forwarding. |
7 | * There is also code for initiating connection forwarding for X11 connections, | |
8 | * arbitrary tcp/ip connections, and the authentication agent connection. | |
6ae2364d | 9 | * |
bcbf86ec | 10 | * As far as I am concerned, the code I have written for this software |
11 | * can be used freely for any purpose. Any derived versions of this | |
12 | * software must be clearly marked as such, and if the derived work is | |
13 | * incompatible with the protocol description in the RFC file, it must be | |
14 | * called by a name other than "ssh" or "Secure Shell". | |
15 | * | |
7e7327a1 | 16 | * SSH2 support added by Markus Friedl. |
8341f420 | 17 | * Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved. |
bcbf86ec | 18 | * Copyright (c) 1999 Dug Song. All rights reserved. |
19 | * Copyright (c) 1999 Theo de Raadt. All rights reserved. | |
20 | * | |
21 | * Redistribution and use in source and binary forms, with or without | |
22 | * modification, are permitted provided that the following conditions | |
23 | * are met: | |
24 | * 1. Redistributions of source code must retain the above copyright | |
25 | * notice, this list of conditions and the following disclaimer. | |
26 | * 2. Redistributions in binary form must reproduce the above copyright | |
27 | * notice, this list of conditions and the following disclaimer in the | |
28 | * documentation and/or other materials provided with the distribution. | |
29 | * | |
30 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
31 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
32 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
33 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
34 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
35 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
36 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
37 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
38 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
39 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
5260325f | 40 | */ |
8efc0c15 | 41 | |
42 | #include "includes.h" | |
bd7c69ea | 43 | |
44 | #include <sys/ioctl.h> | |
cebb4c24 | 45 | #include <sys/types.h> |
46 | #include <sys/un.h> | |
1d3e026f | 47 | |
48 | #include <termios.h> | |
8efc0c15 | 49 | |
50 | #include "ssh.h" | |
42f11eb2 | 51 | #include "ssh1.h" |
52 | #include "ssh2.h" | |
8efc0c15 | 53 | #include "packet.h" |
54 | #include "xmalloc.h" | |
42f11eb2 | 55 | #include "log.h" |
56 | #include "misc.h" | |
8efc0c15 | 57 | #include "channels.h" |
8efc0c15 | 58 | #include "compat.h" |
42f11eb2 | 59 | #include "canohost.h" |
4c8722d9 | 60 | #include "key.h" |
61 | #include "authfd.h" | |
805e659f | 62 | #include "pathnames.h" |
f49658f5 | 63 | #include "bufaux.h" |
8efc0c15 | 64 | |
8e7895b8 | 65 | /* -- channel core */ |
8efc0c15 | 66 | |
aa3378df | 67 | /* |
68 | * Pointer to an array containing all allocated channels. The array is | |
69 | * dynamically extended as needed. | |
70 | */ | |
719fc62f | 71 | static Channel **channels = NULL; |
8efc0c15 | 72 | |
aa3378df | 73 | /* |
74 | * Size of the channel array. All slots of the array must always be | |
719fc62f | 75 | * initialized (at least the type field); unused slots set to NULL |
aa3378df | 76 | */ |
9a995072 | 77 | static u_int channels_alloc = 0; |
8efc0c15 | 78 | |
aa3378df | 79 | /* |
80 | * Maximum file descriptor value used in any of the channels. This is | |
719fc62f | 81 | * updated in channel_new. |
aa3378df | 82 | */ |
39929cdb | 83 | static int channel_max_fd = 0; |
8efc0c15 | 84 | |
8efc0c15 | 85 | |
8e7895b8 | 86 | /* -- tcp forwarding */ |
8efc0c15 | 87 | |
aa3378df | 88 | /* |
89 | * Data structure for storing which hosts are permitted for forward requests. | |
90 | * The local sides of any remote forwards are stored in this array to prevent | |
91 | * a corrupt remote server from accessing arbitrary TCP/IP ports on our local | |
92 | * network (which might be behind a firewall). | |
93 | */ | |
5260325f | 94 | typedef struct { |
7368a6c8 | 95 | char *host_to_connect; /* Connect to 'host'. */ |
96 | u_short port_to_connect; /* Connect to 'port'. */ | |
97 | u_short listen_port; /* Remote side should listen port number. */ | |
8efc0c15 | 98 | } ForwardPermission; |
99 | ||
100 | /* List of all permitted host/port pairs to connect. */ | |
101 | static ForwardPermission permitted_opens[SSH_MAX_FORWARDS_PER_DIRECTION]; | |
8e7895b8 | 102 | |
8efc0c15 | 103 | /* Number of permitted host/port pairs in the array. */ |
104 | static int num_permitted_opens = 0; | |
aa3378df | 105 | /* |
106 | * If this is true, all opens are permitted. This is the case on the server | |
107 | * on which we have to trust the client anyway, and the user could do | |
108 | * anything after logging in anyway. | |
109 | */ | |
8efc0c15 | 110 | static int all_opens_permitted = 0; |
111 | ||
8efc0c15 | 112 | |
8e7895b8 | 113 | /* -- X11 forwarding */ |
42f11eb2 | 114 | |
8e7895b8 | 115 | /* Maximum number of fake X11 displays to try. */ |
116 | #define MAX_DISPLAYS 1000 | |
0490e609 | 117 | |
ef07103c | 118 | /* Saved X11 local (client) display. */ |
119 | static char *x11_saved_display = NULL; | |
120 | ||
8e7895b8 | 121 | /* Saved X11 authentication protocol name. */ |
122 | static char *x11_saved_proto = NULL; | |
8efc0c15 | 123 | |
8e7895b8 | 124 | /* Saved X11 authentication data. This is the real data. */ |
125 | static char *x11_saved_data = NULL; | |
126 | static u_int x11_saved_data_len = 0; | |
127 | ||
128 | /* | |
129 | * Fake X11 authentication data. This is what the server will be sending us; | |
130 | * we should replace any occurrences of this by the real data. | |
131 | */ | |
338eb2ab | 132 | static u_char *x11_fake_data = NULL; |
8e7895b8 | 133 | static u_int x11_fake_data_len; |
134 | ||
135 | ||
136 | /* -- agent forwarding */ | |
8efc0c15 | 137 | |
8e7895b8 | 138 | #define NUM_SOCKS 10 |
139 | ||
8e7895b8 | 140 | /* AF_UNSPEC or AF_INET or AF_INET6 */ |
5e4a7219 | 141 | static int IPv4or6 = AF_UNSPEC; |
8e7895b8 | 142 | |
143 | /* helper */ | |
396c147e | 144 | static void port_open_helper(Channel *c, char *rtype); |
8e7895b8 | 145 | |
146 | /* -- channel core */ | |
7368a6c8 | 147 | |
148 | Channel * | |
b872f7f0 | 149 | channel_by_id(int id) |
7368a6c8 | 150 | { |
151 | Channel *c; | |
719fc62f | 152 | |
9a995072 | 153 | if (id < 0 || (u_int)id >= channels_alloc) { |
b872f7f0 | 154 | logit("channel_by_id: %d: bad id", id); |
7368a6c8 | 155 | return NULL; |
156 | } | |
719fc62f | 157 | c = channels[id]; |
158 | if (c == NULL) { | |
b872f7f0 | 159 | logit("channel_by_id: %d: bad id: channel free", id); |
7368a6c8 | 160 | return NULL; |
161 | } | |
162 | return c; | |
163 | } | |
164 | ||
b872f7f0 | 165 | /* |
166 | * Returns the channel if it is allowed to receive protocol messages. | |
167 | * Private channels, like listening sockets, may not receive messages. | |
168 | */ | |
169 | Channel * | |
170 | channel_lookup(int id) | |
171 | { | |
172 | Channel *c; | |
173 | ||
174 | if ((c = channel_by_id(id)) == NULL) | |
175 | return (NULL); | |
176 | ||
c8e9c167 | 177 | switch (c->type) { |
b872f7f0 | 178 | case SSH_CHANNEL_X11_OPEN: |
179 | case SSH_CHANNEL_LARVAL: | |
180 | case SSH_CHANNEL_CONNECTING: | |
181 | case SSH_CHANNEL_DYNAMIC: | |
182 | case SSH_CHANNEL_OPENING: | |
183 | case SSH_CHANNEL_OPEN: | |
184 | case SSH_CHANNEL_INPUT_DRAINING: | |
185 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
186 | return (c); | |
b872f7f0 | 187 | } |
188 | logit("Non-public channel %d, type %d.", id, c->type); | |
189 | return (NULL); | |
190 | } | |
191 | ||
aa3378df | 192 | /* |
1d1ffb87 | 193 | * Register filedescriptors for a channel, used when allocating a channel or |
0fbe8c74 | 194 | * when the channel consumer/producer is ready, e.g. shell exec'd |
aa3378df | 195 | */ |
396c147e | 196 | static void |
a22aff1f | 197 | channel_register_fds(Channel *c, int rfd, int wfd, int efd, |
198 | int extusage, int nonblock) | |
8efc0c15 | 199 | { |
5260325f | 200 | /* Update the maximum file descriptor value. */ |
39929cdb | 201 | channel_max_fd = MAX(channel_max_fd, rfd); |
202 | channel_max_fd = MAX(channel_max_fd, wfd); | |
203 | channel_max_fd = MAX(channel_max_fd, efd); | |
204 | ||
aa3378df | 205 | /* XXX set close-on-exec -markus */ |
1d1ffb87 | 206 | |
0fbe8c74 | 207 | c->rfd = rfd; |
208 | c->wfd = wfd; | |
209 | c->sock = (rfd == wfd) ? rfd : -1; | |
5e96b616 | 210 | c->ctl_fd = -1; /* XXX: set elsewhere */ |
0fbe8c74 | 211 | c->efd = efd; |
212 | c->extended_usage = extusage; | |
a22aff1f | 213 | |
0ae4fe1d | 214 | /* XXX ugly hack: nonblock is only set by the server */ |
215 | if (nonblock && isatty(c->rfd)) { | |
d7ac5f18 | 216 | debug2("channel %d: rfd %d isatty", c->self, c->rfd); |
0ae4fe1d | 217 | c->isatty = 1; |
218 | if (!isatty(c->wfd)) { | |
94dfb550 | 219 | error("channel %d: wfd %d is not a tty?", |
0ae4fe1d | 220 | c->self, c->wfd); |
221 | } | |
222 | } else { | |
223 | c->isatty = 0; | |
224 | } | |
21c2c5cd | 225 | c->wfd_isatty = isatty(c->wfd); |
0ae4fe1d | 226 | |
a22aff1f | 227 | /* enable nonblocking mode */ |
228 | if (nonblock) { | |
229 | if (rfd != -1) | |
230 | set_nonblock(rfd); | |
231 | if (wfd != -1) | |
232 | set_nonblock(wfd); | |
233 | if (efd != -1) | |
234 | set_nonblock(efd); | |
235 | } | |
0fbe8c74 | 236 | } |
237 | ||
238 | /* | |
239 | * Allocate a new channel object and set its type and socket. This will cause | |
240 | * remote_name to be freed. | |
241 | */ | |
719fc62f | 242 | Channel * |
0fbe8c74 | 243 | channel_new(char *ctype, int type, int rfd, int wfd, int efd, |
f91d9a89 | 244 | u_int window, u_int maxpack, int extusage, char *remote_name, int nonblock) |
0fbe8c74 | 245 | { |
9a995072 | 246 | int found; |
247 | u_int i; | |
0fbe8c74 | 248 | Channel *c; |
5260325f | 249 | |
250 | /* Do initial allocation if this is the first call. */ | |
251 | if (channels_alloc == 0) { | |
252 | channels_alloc = 10; | |
52e3daed | 253 | channels = xcalloc(channels_alloc, sizeof(Channel *)); |
5260325f | 254 | for (i = 0; i < channels_alloc; i++) |
719fc62f | 255 | channels[i] = NULL; |
5260325f | 256 | } |
257 | /* Try to find a free slot where to put the new channel. */ | |
258 | for (found = -1, i = 0; i < channels_alloc; i++) | |
719fc62f | 259 | if (channels[i] == NULL) { |
5260325f | 260 | /* Found a free slot. */ |
9a995072 | 261 | found = (int)i; |
5260325f | 262 | break; |
263 | } | |
9a995072 | 264 | if (found < 0) { |
aa3378df | 265 | /* There are no free slots. Take last+1 slot and expand the array. */ |
5260325f | 266 | found = channels_alloc; |
5df8c731 | 267 | if (channels_alloc > 10000) |
268 | fatal("channel_new: internal error: channels_alloc %d " | |
269 | "too big.", channels_alloc); | |
c5d10563 | 270 | channels = xrealloc(channels, channels_alloc + 10, |
271 | sizeof(Channel *)); | |
20419cc1 | 272 | channels_alloc += 10; |
de273eef | 273 | debug2("channel: expanding %d", channels_alloc); |
5260325f | 274 | for (i = found; i < channels_alloc; i++) |
719fc62f | 275 | channels[i] = NULL; |
5260325f | 276 | } |
719fc62f | 277 | /* Initialize and return new channel. */ |
52e3daed | 278 | c = channels[found] = xcalloc(1, sizeof(Channel)); |
5260325f | 279 | buffer_init(&c->input); |
280 | buffer_init(&c->output); | |
7368a6c8 | 281 | buffer_init(&c->extended); |
70bef40e | 282 | c->ostate = CHAN_OUTPUT_OPEN; |
283 | c->istate = CHAN_INPUT_OPEN; | |
284 | c->flags = 0; | |
a22aff1f | 285 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock); |
5260325f | 286 | c->self = found; |
287 | c->type = type; | |
7368a6c8 | 288 | c->ctype = ctype; |
0b242b12 | 289 | c->local_window = window; |
290 | c->local_window_max = window; | |
291 | c->local_consumed = 0; | |
292 | c->local_maxpacket = maxpack; | |
5260325f | 293 | c->remote_id = -1; |
0d942eff | 294 | c->remote_name = xstrdup(remote_name); |
7368a6c8 | 295 | c->remote_window = 0; |
296 | c->remote_maxpacket = 0; | |
a5f82435 | 297 | c->force_drain = 0; |
ac151b18 | 298 | c->single_connection = 0; |
3cf2be58 | 299 | c->detach_user = NULL; |
8cd0437d | 300 | c->detach_close = 0; |
05ca0898 | 301 | c->confirm = NULL; |
5e96b616 | 302 | c->confirm_ctx = NULL; |
2e73a022 | 303 | c->input_filter = NULL; |
c1c6a032 | 304 | c->output_filter = NULL; |
5260325f | 305 | debug("channel %d: new [%s]", found, remote_name); |
719fc62f | 306 | return c; |
7368a6c8 | 307 | } |
8efc0c15 | 308 | |
489aa2e9 | 309 | static int |
310 | channel_find_maxfd(void) | |
311 | { | |
9a995072 | 312 | u_int i; |
313 | int max = 0; | |
489aa2e9 | 314 | Channel *c; |
315 | ||
316 | for (i = 0; i < channels_alloc; i++) { | |
317 | c = channels[i]; | |
318 | if (c != NULL) { | |
319 | max = MAX(max, c->rfd); | |
320 | max = MAX(max, c->wfd); | |
321 | max = MAX(max, c->efd); | |
322 | } | |
323 | } | |
324 | return max; | |
325 | } | |
326 | ||
327 | int | |
328 | channel_close_fd(int *fdp) | |
329 | { | |
330 | int ret = 0, fd = *fdp; | |
331 | ||
332 | if (fd != -1) { | |
333 | ret = close(fd); | |
334 | *fdp = -1; | |
335 | if (fd == channel_max_fd) | |
336 | channel_max_fd = channel_find_maxfd(); | |
337 | } | |
338 | return ret; | |
339 | } | |
340 | ||
0fbe8c74 | 341 | /* Close all channel fd/socket. */ |
396c147e | 342 | static void |
0fbe8c74 | 343 | channel_close_fds(Channel *c) |
344 | { | |
5e96b616 | 345 | debug3("channel %d: close_fds r %d w %d e %d c %d", |
346 | c->self, c->rfd, c->wfd, c->efd, c->ctl_fd); | |
6fd8622b | 347 | |
489aa2e9 | 348 | channel_close_fd(&c->sock); |
5e96b616 | 349 | channel_close_fd(&c->ctl_fd); |
489aa2e9 | 350 | channel_close_fd(&c->rfd); |
351 | channel_close_fd(&c->wfd); | |
352 | channel_close_fd(&c->efd); | |
0fbe8c74 | 353 | } |
354 | ||
8e7895b8 | 355 | /* Free the channel and close its fd/socket. */ |
8e7895b8 | 356 | void |
357 | channel_free(Channel *c) | |
358 | { | |
359 | char *s; | |
9a995072 | 360 | u_int i, n; |
8e7895b8 | 361 | |
362 | for (n = 0, i = 0; i < channels_alloc; i++) | |
363 | if (channels[i]) | |
364 | n++; | |
9a995072 | 365 | debug("channel %d: free: %s, nchannels %u", c->self, |
8e7895b8 | 366 | c->remote_name ? c->remote_name : "???", n); |
367 | ||
368 | s = channel_open_message(); | |
d7ac5f18 | 369 | debug3("channel %d: status: %s", c->self, s); |
8e7895b8 | 370 | xfree(s); |
371 | ||
8e7895b8 | 372 | if (c->sock != -1) |
373 | shutdown(c->sock, SHUT_RDWR); | |
5e96b616 | 374 | if (c->ctl_fd != -1) |
375 | shutdown(c->ctl_fd, SHUT_RDWR); | |
8e7895b8 | 376 | channel_close_fds(c); |
377 | buffer_free(&c->input); | |
378 | buffer_free(&c->output); | |
379 | buffer_free(&c->extended); | |
380 | if (c->remote_name) { | |
381 | xfree(c->remote_name); | |
382 | c->remote_name = NULL; | |
383 | } | |
384 | channels[c->self] = NULL; | |
385 | xfree(c); | |
386 | } | |
387 | ||
8e7895b8 | 388 | void |
d6746a0b | 389 | channel_free_all(void) |
8e7895b8 | 390 | { |
9a995072 | 391 | u_int i; |
8e7895b8 | 392 | |
d6746a0b | 393 | for (i = 0; i < channels_alloc; i++) |
394 | if (channels[i] != NULL) | |
395 | channel_free(channels[i]); | |
8e7895b8 | 396 | } |
397 | ||
398 | /* | |
399 | * Closes the sockets/fds of all channels. This is used to close extra file | |
400 | * descriptors after a fork. | |
401 | */ | |
8e7895b8 | 402 | void |
d5bb9418 | 403 | channel_close_all(void) |
8e7895b8 | 404 | { |
9a995072 | 405 | u_int i; |
8e7895b8 | 406 | |
407 | for (i = 0; i < channels_alloc; i++) | |
408 | if (channels[i] != NULL) | |
409 | channel_close_fds(channels[i]); | |
410 | } | |
411 | ||
3cf2be58 | 412 | /* |
413 | * Stop listening to channels. | |
414 | */ | |
3cf2be58 | 415 | void |
416 | channel_stop_listening(void) | |
417 | { | |
9a995072 | 418 | u_int i; |
3cf2be58 | 419 | Channel *c; |
420 | ||
421 | for (i = 0; i < channels_alloc; i++) { | |
422 | c = channels[i]; | |
423 | if (c != NULL) { | |
424 | switch (c->type) { | |
425 | case SSH_CHANNEL_AUTH_SOCKET: | |
426 | case SSH_CHANNEL_PORT_LISTENER: | |
427 | case SSH_CHANNEL_RPORT_LISTENER: | |
428 | case SSH_CHANNEL_X11_LISTENER: | |
489aa2e9 | 429 | channel_close_fd(&c->sock); |
3cf2be58 | 430 | channel_free(c); |
431 | break; | |
432 | } | |
433 | } | |
434 | } | |
435 | } | |
436 | ||
8e7895b8 | 437 | /* |
438 | * Returns true if no channel has too much buffered data, and false if one or | |
439 | * more channel is overfull. | |
440 | */ | |
8e7895b8 | 441 | int |
d5bb9418 | 442 | channel_not_very_much_buffered_data(void) |
8e7895b8 | 443 | { |
444 | u_int i; | |
445 | Channel *c; | |
446 | ||
447 | for (i = 0; i < channels_alloc; i++) { | |
448 | c = channels[i]; | |
449 | if (c != NULL && c->type == SSH_CHANNEL_OPEN) { | |
0c139bd1 | 450 | #if 0 |
451 | if (!compat20 && | |
452 | buffer_len(&c->input) > packet_get_maxsize()) { | |
faa483fa | 453 | debug2("channel %d: big input buffer %d", |
8e7895b8 | 454 | c->self, buffer_len(&c->input)); |
455 | return 0; | |
456 | } | |
0c139bd1 | 457 | #endif |
8e7895b8 | 458 | if (buffer_len(&c->output) > packet_get_maxsize()) { |
a27002e5 | 459 | debug2("channel %d: big output buffer %u > %u", |
0c139bd1 | 460 | c->self, buffer_len(&c->output), |
461 | packet_get_maxsize()); | |
8e7895b8 | 462 | return 0; |
463 | } | |
464 | } | |
465 | } | |
466 | return 1; | |
467 | } | |
468 | ||
469 | /* Returns true if any channel is still open. */ | |
8e7895b8 | 470 | int |
d5bb9418 | 471 | channel_still_open(void) |
8e7895b8 | 472 | { |
9a995072 | 473 | u_int i; |
8e7895b8 | 474 | Channel *c; |
475 | ||
476 | for (i = 0; i < channels_alloc; i++) { | |
477 | c = channels[i]; | |
478 | if (c == NULL) | |
479 | continue; | |
480 | switch (c->type) { | |
481 | case SSH_CHANNEL_X11_LISTENER: | |
482 | case SSH_CHANNEL_PORT_LISTENER: | |
483 | case SSH_CHANNEL_RPORT_LISTENER: | |
484 | case SSH_CHANNEL_CLOSED: | |
485 | case SSH_CHANNEL_AUTH_SOCKET: | |
486 | case SSH_CHANNEL_DYNAMIC: | |
487 | case SSH_CHANNEL_CONNECTING: | |
488 | case SSH_CHANNEL_ZOMBIE: | |
489 | continue; | |
490 | case SSH_CHANNEL_LARVAL: | |
491 | if (!compat20) | |
492 | fatal("cannot happen: SSH_CHANNEL_LARVAL"); | |
493 | continue; | |
494 | case SSH_CHANNEL_OPENING: | |
495 | case SSH_CHANNEL_OPEN: | |
496 | case SSH_CHANNEL_X11_OPEN: | |
497 | return 1; | |
498 | case SSH_CHANNEL_INPUT_DRAINING: | |
499 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
500 | if (!compat13) | |
501 | fatal("cannot happen: OUT_DRAIN"); | |
502 | return 1; | |
503 | default: | |
504 | fatal("channel_still_open: bad channel type %d", c->type); | |
505 | /* NOTREACHED */ | |
506 | } | |
507 | } | |
508 | return 0; | |
509 | } | |
510 | ||
511 | /* Returns the id of an open channel suitable for keepaliving */ | |
8e7895b8 | 512 | int |
d5bb9418 | 513 | channel_find_open(void) |
8e7895b8 | 514 | { |
9a995072 | 515 | u_int i; |
8e7895b8 | 516 | Channel *c; |
517 | ||
518 | for (i = 0; i < channels_alloc; i++) { | |
519 | c = channels[i]; | |
13de3560 | 520 | if (c == NULL || c->remote_id < 0) |
8e7895b8 | 521 | continue; |
522 | switch (c->type) { | |
523 | case SSH_CHANNEL_CLOSED: | |
524 | case SSH_CHANNEL_DYNAMIC: | |
525 | case SSH_CHANNEL_X11_LISTENER: | |
526 | case SSH_CHANNEL_PORT_LISTENER: | |
527 | case SSH_CHANNEL_RPORT_LISTENER: | |
528 | case SSH_CHANNEL_OPENING: | |
529 | case SSH_CHANNEL_CONNECTING: | |
530 | case SSH_CHANNEL_ZOMBIE: | |
531 | continue; | |
532 | case SSH_CHANNEL_LARVAL: | |
533 | case SSH_CHANNEL_AUTH_SOCKET: | |
534 | case SSH_CHANNEL_OPEN: | |
535 | case SSH_CHANNEL_X11_OPEN: | |
536 | return i; | |
537 | case SSH_CHANNEL_INPUT_DRAINING: | |
538 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
539 | if (!compat13) | |
540 | fatal("cannot happen: OUT_DRAIN"); | |
541 | return i; | |
542 | default: | |
543 | fatal("channel_find_open: bad channel type %d", c->type); | |
544 | /* NOTREACHED */ | |
545 | } | |
546 | } | |
547 | return -1; | |
548 | } | |
549 | ||
550 | ||
551 | /* | |
552 | * Returns a message describing the currently open forwarded connections, | |
553 | * suitable for sending to the client. The message contains crlf pairs for | |
554 | * newlines. | |
555 | */ | |
8e7895b8 | 556 | char * |
d5bb9418 | 557 | channel_open_message(void) |
8e7895b8 | 558 | { |
559 | Buffer buffer; | |
560 | Channel *c; | |
561 | char buf[1024], *cp; | |
9a995072 | 562 | u_int i; |
8e7895b8 | 563 | |
564 | buffer_init(&buffer); | |
565 | snprintf(buf, sizeof buf, "The following connections are open:\r\n"); | |
566 | buffer_append(&buffer, buf, strlen(buf)); | |
567 | for (i = 0; i < channels_alloc; i++) { | |
568 | c = channels[i]; | |
569 | if (c == NULL) | |
570 | continue; | |
571 | switch (c->type) { | |
572 | case SSH_CHANNEL_X11_LISTENER: | |
573 | case SSH_CHANNEL_PORT_LISTENER: | |
574 | case SSH_CHANNEL_RPORT_LISTENER: | |
575 | case SSH_CHANNEL_CLOSED: | |
576 | case SSH_CHANNEL_AUTH_SOCKET: | |
577 | case SSH_CHANNEL_ZOMBIE: | |
578 | continue; | |
579 | case SSH_CHANNEL_LARVAL: | |
580 | case SSH_CHANNEL_OPENING: | |
581 | case SSH_CHANNEL_CONNECTING: | |
582 | case SSH_CHANNEL_DYNAMIC: | |
583 | case SSH_CHANNEL_OPEN: | |
584 | case SSH_CHANNEL_X11_OPEN: | |
585 | case SSH_CHANNEL_INPUT_DRAINING: | |
586 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
5e96b616 | 587 | snprintf(buf, sizeof buf, |
588 | " #%d %.300s (t%d r%d i%d/%d o%d/%d fd %d/%d cfd %d)\r\n", | |
8e7895b8 | 589 | c->self, c->remote_name, |
590 | c->type, c->remote_id, | |
591 | c->istate, buffer_len(&c->input), | |
592 | c->ostate, buffer_len(&c->output), | |
5e96b616 | 593 | c->rfd, c->wfd, c->ctl_fd); |
8e7895b8 | 594 | buffer_append(&buffer, buf, strlen(buf)); |
595 | continue; | |
596 | default: | |
597 | fatal("channel_open_message: bad channel type %d", c->type); | |
598 | /* NOTREACHED */ | |
599 | } | |
600 | } | |
601 | buffer_append(&buffer, "\0", 1); | |
602 | cp = xstrdup(buffer_ptr(&buffer)); | |
603 | buffer_free(&buffer); | |
604 | return cp; | |
605 | } | |
606 | ||
607 | void | |
608 | channel_send_open(int id) | |
609 | { | |
610 | Channel *c = channel_lookup(id); | |
e1feb9bf | 611 | |
8e7895b8 | 612 | if (c == NULL) { |
bbe88b6d | 613 | logit("channel_send_open: %d: bad id", id); |
8e7895b8 | 614 | return; |
615 | } | |
6226a8f8 | 616 | debug2("channel %d: send open", id); |
8e7895b8 | 617 | packet_start(SSH2_MSG_CHANNEL_OPEN); |
618 | packet_put_cstring(c->ctype); | |
619 | packet_put_int(c->self); | |
620 | packet_put_int(c->local_window); | |
621 | packet_put_int(c->local_maxpacket); | |
622 | packet_send(); | |
623 | } | |
624 | ||
625 | void | |
6226a8f8 | 626 | channel_request_start(int id, char *service, int wantconfirm) |
8e7895b8 | 627 | { |
6226a8f8 | 628 | Channel *c = channel_lookup(id); |
e1feb9bf | 629 | |
8e7895b8 | 630 | if (c == NULL) { |
bbe88b6d | 631 | logit("channel_request_start: %d: unknown channel id", id); |
8e7895b8 | 632 | return; |
633 | } | |
5e96b616 | 634 | debug2("channel %d: request %s confirm %d", id, service, wantconfirm); |
8e7895b8 | 635 | packet_start(SSH2_MSG_CHANNEL_REQUEST); |
636 | packet_put_int(c->remote_id); | |
637 | packet_put_cstring(service); | |
638 | packet_put_char(wantconfirm); | |
639 | } | |
a7137f6b | 640 | |
8e7895b8 | 641 | void |
5e96b616 | 642 | channel_register_confirm(int id, channel_callback_fn *fn, void *ctx) |
8e7895b8 | 643 | { |
644 | Channel *c = channel_lookup(id); | |
e1feb9bf | 645 | |
8e7895b8 | 646 | if (c == NULL) { |
bbe88b6d | 647 | logit("channel_register_comfirm: %d: bad id", id); |
8e7895b8 | 648 | return; |
649 | } | |
05ca0898 | 650 | c->confirm = fn; |
5e96b616 | 651 | c->confirm_ctx = ctx; |
8e7895b8 | 652 | } |
a7137f6b | 653 | |
8e7895b8 | 654 | void |
8cd0437d | 655 | channel_register_cleanup(int id, channel_callback_fn *fn, int do_close) |
8e7895b8 | 656 | { |
b872f7f0 | 657 | Channel *c = channel_by_id(id); |
e1feb9bf | 658 | |
8e7895b8 | 659 | if (c == NULL) { |
bbe88b6d | 660 | logit("channel_register_cleanup: %d: bad id", id); |
8e7895b8 | 661 | return; |
662 | } | |
3cf2be58 | 663 | c->detach_user = fn; |
8cd0437d | 664 | c->detach_close = do_close; |
8e7895b8 | 665 | } |
a7137f6b | 666 | |
8e7895b8 | 667 | void |
668 | channel_cancel_cleanup(int id) | |
669 | { | |
b872f7f0 | 670 | Channel *c = channel_by_id(id); |
e1feb9bf | 671 | |
8e7895b8 | 672 | if (c == NULL) { |
bbe88b6d | 673 | logit("channel_cancel_cleanup: %d: bad id", id); |
8e7895b8 | 674 | return; |
675 | } | |
3cf2be58 | 676 | c->detach_user = NULL; |
8cd0437d | 677 | c->detach_close = 0; |
8e7895b8 | 678 | } |
a7137f6b | 679 | |
8e7895b8 | 680 | void |
c1c6a032 | 681 | channel_register_filter(int id, channel_infilter_fn *ifn, |
682 | channel_outfilter_fn *ofn) | |
8e7895b8 | 683 | { |
684 | Channel *c = channel_lookup(id); | |
e1feb9bf | 685 | |
8e7895b8 | 686 | if (c == NULL) { |
bbe88b6d | 687 | logit("channel_register_filter: %d: bad id", id); |
8e7895b8 | 688 | return; |
689 | } | |
c1c6a032 | 690 | c->input_filter = ifn; |
691 | c->output_filter = ofn; | |
8e7895b8 | 692 | } |
693 | ||
6ae2364d | 694 | void |
8e7895b8 | 695 | channel_set_fds(int id, int rfd, int wfd, int efd, |
399d1ea6 | 696 | int extusage, int nonblock, u_int window_max) |
8efc0c15 | 697 | { |
8e7895b8 | 698 | Channel *c = channel_lookup(id); |
e1feb9bf | 699 | |
8e7895b8 | 700 | if (c == NULL || c->type != SSH_CHANNEL_LARVAL) |
701 | fatal("channel_activate for non-larval channel %d.", id); | |
702 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock); | |
703 | c->type = SSH_CHANNEL_OPEN; | |
399d1ea6 | 704 | c->local_window = c->local_window_max = window_max; |
8e7895b8 | 705 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
706 | packet_put_int(c->remote_id); | |
707 | packet_put_int(c->local_window); | |
708 | packet_send(); | |
8efc0c15 | 709 | } |
710 | ||
aa3378df | 711 | /* |
7368a6c8 | 712 | * 'channel_pre*' are called just before select() to add any bits relevant to |
713 | * channels in the select bitmasks. | |
aa3378df | 714 | */ |
7368a6c8 | 715 | /* |
716 | * 'channel_post*': perform any appropriate operations for channels which | |
717 | * have events pending. | |
718 | */ | |
c8e9c167 | 719 | typedef void chan_fn(Channel *c, fd_set *readset, fd_set *writeset); |
7368a6c8 | 720 | chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE]; |
721 | chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE]; | |
8efc0c15 | 722 | |
396c147e | 723 | static void |
c8e9c167 | 724 | channel_pre_listener(Channel *c, fd_set *readset, fd_set *writeset) |
8efc0c15 | 725 | { |
7368a6c8 | 726 | FD_SET(c->sock, readset); |
727 | } | |
5260325f | 728 | |
396c147e | 729 | static void |
c8e9c167 | 730 | channel_pre_connecting(Channel *c, fd_set *readset, fd_set *writeset) |
97fb6912 | 731 | { |
732 | debug3("channel %d: waiting for connection", c->self); | |
733 | FD_SET(c->sock, writeset); | |
734 | } | |
735 | ||
396c147e | 736 | static void |
c8e9c167 | 737 | channel_pre_open_13(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 738 | { |
739 | if (buffer_len(&c->input) < packet_get_maxsize()) | |
740 | FD_SET(c->sock, readset); | |
741 | if (buffer_len(&c->output) > 0) | |
742 | FD_SET(c->sock, writeset); | |
743 | } | |
5260325f | 744 | |
396c147e | 745 | static void |
c8e9c167 | 746 | channel_pre_open(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 747 | { |
0c0738d5 | 748 | u_int limit = compat20 ? c->remote_window : packet_get_maxsize(); |
5260325f | 749 | |
7e7327a1 | 750 | if (c->istate == CHAN_INPUT_OPEN && |
0c0738d5 | 751 | limit > 0 && |
69d9d413 | 752 | buffer_len(&c->input) < limit && |
753 | buffer_check_alloc(&c->input, CHAN_RBUF)) | |
7e7327a1 | 754 | FD_SET(c->rfd, readset); |
755 | if (c->ostate == CHAN_OUTPUT_OPEN || | |
756 | c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { | |
757 | if (buffer_len(&c->output) > 0) { | |
758 | FD_SET(c->wfd, writeset); | |
759 | } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { | |
d2296ed7 | 760 | if (CHANNEL_EFD_OUTPUT_ACTIVE(c)) |
4e2e5cfd | 761 | debug2("channel %d: obuf_empty delayed efd %d/(%d)", |
762 | c->self, c->efd, buffer_len(&c->extended)); | |
d2296ed7 | 763 | else |
764 | chan_obuf_empty(c); | |
7e7327a1 | 765 | } |
766 | } | |
767 | /** XXX check close conditions, too */ | |
0c0738d5 | 768 | if (compat20 && c->efd != -1) { |
7e7327a1 | 769 | if (c->extended_usage == CHAN_EXTENDED_WRITE && |
770 | buffer_len(&c->extended) > 0) | |
771 | FD_SET(c->efd, writeset); | |
d2296ed7 | 772 | else if (!(c->flags & CHAN_EOF_SENT) && |
773 | c->extended_usage == CHAN_EXTENDED_READ && | |
7e7327a1 | 774 | buffer_len(&c->extended) < c->remote_window) |
775 | FD_SET(c->efd, readset); | |
776 | } | |
5e96b616 | 777 | /* XXX: What about efd? races? */ |
f2107e97 | 778 | if (compat20 && c->ctl_fd != -1 && |
5e96b616 | 779 | c->istate == CHAN_INPUT_OPEN && c->ostate == CHAN_OUTPUT_OPEN) |
780 | FD_SET(c->ctl_fd, readset); | |
7e7327a1 | 781 | } |
782 | ||
396c147e | 783 | static void |
c8e9c167 | 784 | channel_pre_input_draining(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 785 | { |
786 | if (buffer_len(&c->input) == 0) { | |
787 | packet_start(SSH_MSG_CHANNEL_CLOSE); | |
788 | packet_put_int(c->remote_id); | |
789 | packet_send(); | |
790 | c->type = SSH_CHANNEL_CLOSED; | |
d7ac5f18 | 791 | debug2("channel %d: closing after input drain.", c->self); |
7368a6c8 | 792 | } |
793 | } | |
5260325f | 794 | |
396c147e | 795 | static void |
c8e9c167 | 796 | channel_pre_output_draining(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 797 | { |
798 | if (buffer_len(&c->output) == 0) | |
719fc62f | 799 | chan_mark_dead(c); |
6ae2364d | 800 | else |
7368a6c8 | 801 | FD_SET(c->sock, writeset); |
802 | } | |
5260325f | 803 | |
7368a6c8 | 804 | /* |
805 | * This is a special state for X11 authentication spoofing. An opened X11 | |
806 | * connection (when authentication spoofing is being done) remains in this | |
807 | * state until the first packet has been completely read. The authentication | |
808 | * data in that packet is then substituted by the real data if it matches the | |
809 | * fake data, and the channel is put into normal mode. | |
0b242b12 | 810 | * XXX All this happens at the client side. |
8e7895b8 | 811 | * Returns: 0 = need more data, -1 = wrong cookie, 1 = ok |
7368a6c8 | 812 | */ |
396c147e | 813 | static int |
8e7895b8 | 814 | x11_open_helper(Buffer *b) |
7368a6c8 | 815 | { |
1e3b8b07 | 816 | u_char *ucp; |
817 | u_int proto_len, data_len; | |
5260325f | 818 | |
7368a6c8 | 819 | /* Check if the fixed size part of the packet is in buffer. */ |
8e7895b8 | 820 | if (buffer_len(b) < 12) |
7368a6c8 | 821 | return 0; |
822 | ||
823 | /* Parse the lengths of variable-length fields. */ | |
20905a8e | 824 | ucp = buffer_ptr(b); |
7368a6c8 | 825 | if (ucp[0] == 0x42) { /* Byte order MSB first. */ |
826 | proto_len = 256 * ucp[6] + ucp[7]; | |
827 | data_len = 256 * ucp[8] + ucp[9]; | |
828 | } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */ | |
829 | proto_len = ucp[6] + 256 * ucp[7]; | |
830 | data_len = ucp[8] + 256 * ucp[9]; | |
831 | } else { | |
d7ac5f18 | 832 | debug2("Initial X11 packet contains bad byte order byte: 0x%x", |
184eed6a | 833 | ucp[0]); |
7368a6c8 | 834 | return -1; |
835 | } | |
5260325f | 836 | |
7368a6c8 | 837 | /* Check if the whole packet is in buffer. */ |
8e7895b8 | 838 | if (buffer_len(b) < |
7368a6c8 | 839 | 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3)) |
840 | return 0; | |
5260325f | 841 | |
7368a6c8 | 842 | /* Check if authentication protocol matches. */ |
843 | if (proto_len != strlen(x11_saved_proto) || | |
844 | memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) { | |
d7ac5f18 | 845 | debug2("X11 connection uses different authentication protocol."); |
7368a6c8 | 846 | return -1; |
847 | } | |
848 | /* Check if authentication data matches our fake data. */ | |
849 | if (data_len != x11_fake_data_len || | |
850 | memcmp(ucp + 12 + ((proto_len + 3) & ~3), | |
851 | x11_fake_data, x11_fake_data_len) != 0) { | |
d7ac5f18 | 852 | debug2("X11 auth data does not match fake data."); |
7368a6c8 | 853 | return -1; |
854 | } | |
855 | /* Check fake data length */ | |
856 | if (x11_fake_data_len != x11_saved_data_len) { | |
857 | error("X11 fake_data_len %d != saved_data_len %d", | |
858 | x11_fake_data_len, x11_saved_data_len); | |
859 | return -1; | |
860 | } | |
861 | /* | |
862 | * Received authentication protocol and data match | |
863 | * our fake data. Substitute the fake data with real | |
864 | * data. | |
865 | */ | |
866 | memcpy(ucp + 12 + ((proto_len + 3) & ~3), | |
867 | x11_saved_data, x11_saved_data_len); | |
868 | return 1; | |
869 | } | |
5260325f | 870 | |
396c147e | 871 | static void |
c8e9c167 | 872 | channel_pre_x11_open_13(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 873 | { |
8e7895b8 | 874 | int ret = x11_open_helper(&c->output); |
e1feb9bf | 875 | |
7368a6c8 | 876 | if (ret == 1) { |
877 | /* Start normal processing for the channel. */ | |
878 | c->type = SSH_CHANNEL_OPEN; | |
a8be9f80 | 879 | channel_pre_open_13(c, readset, writeset); |
7368a6c8 | 880 | } else if (ret == -1) { |
881 | /* | |
882 | * We have received an X11 connection that has bad | |
883 | * authentication information. | |
884 | */ | |
bbe88b6d | 885 | logit("X11 connection rejected because of wrong authentication."); |
7368a6c8 | 886 | buffer_clear(&c->input); |
887 | buffer_clear(&c->output); | |
489aa2e9 | 888 | channel_close_fd(&c->sock); |
7368a6c8 | 889 | c->sock = -1; |
890 | c->type = SSH_CHANNEL_CLOSED; | |
891 | packet_start(SSH_MSG_CHANNEL_CLOSE); | |
892 | packet_put_int(c->remote_id); | |
893 | packet_send(); | |
894 | } | |
895 | } | |
5260325f | 896 | |
396c147e | 897 | static void |
c8e9c167 | 898 | channel_pre_x11_open(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 899 | { |
8e7895b8 | 900 | int ret = x11_open_helper(&c->output); |
a5f82435 | 901 | |
902 | /* c->force_drain = 1; */ | |
903 | ||
7368a6c8 | 904 | if (ret == 1) { |
905 | c->type = SSH_CHANNEL_OPEN; | |
0c0738d5 | 906 | channel_pre_open(c, readset, writeset); |
7368a6c8 | 907 | } else if (ret == -1) { |
bbe88b6d | 908 | logit("X11 connection rejected because of wrong authentication."); |
d7ac5f18 | 909 | debug2("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate); |
8341f420 | 910 | chan_read_failed(c); |
911 | buffer_clear(&c->input); | |
912 | chan_ibuf_empty(c); | |
913 | buffer_clear(&c->output); | |
914 | /* for proto v1, the peer will send an IEOF */ | |
915 | if (compat20) | |
916 | chan_write_failed(c); | |
917 | else | |
918 | c->type = SSH_CHANNEL_OPEN; | |
d7ac5f18 | 919 | debug2("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate); |
7368a6c8 | 920 | } |
921 | } | |
5260325f | 922 | |
28b9cb4d | 923 | /* try to decode a socks4 header */ |
396c147e | 924 | static int |
c8e9c167 | 925 | channel_decode_socks4(Channel *c, fd_set *readset, fd_set *writeset) |
0490e609 | 926 | { |
661e45a0 | 927 | char *p, *host; |
2ceb8101 | 928 | u_int len, have, i, found; |
184eed6a | 929 | char username[256]; |
0490e609 | 930 | struct { |
931 | u_int8_t version; | |
932 | u_int8_t command; | |
933 | u_int16_t dest_port; | |
28b9cb4d | 934 | struct in_addr dest_addr; |
0490e609 | 935 | } s4_req, s4_rsp; |
936 | ||
28b9cb4d | 937 | debug2("channel %d: decode socks4", c->self); |
53b8fe68 | 938 | |
939 | have = buffer_len(&c->input); | |
940 | len = sizeof(s4_req); | |
941 | if (have < len) | |
942 | return 0; | |
943 | p = buffer_ptr(&c->input); | |
944 | for (found = 0, i = len; i < have; i++) { | |
945 | if (p[i] == '\0') { | |
946 | found = 1; | |
947 | break; | |
948 | } | |
949 | if (i > 1024) { | |
950 | /* the peer is probably sending garbage */ | |
951 | debug("channel %d: decode socks4: too long", | |
952 | c->self); | |
953 | return -1; | |
954 | } | |
955 | } | |
956 | if (!found) | |
957 | return 0; | |
0490e609 | 958 | buffer_get(&c->input, (char *)&s4_req.version, 1); |
959 | buffer_get(&c->input, (char *)&s4_req.command, 1); | |
960 | buffer_get(&c->input, (char *)&s4_req.dest_port, 2); | |
28b9cb4d | 961 | buffer_get(&c->input, (char *)&s4_req.dest_addr, 4); |
53b8fe68 | 962 | have = buffer_len(&c->input); |
0490e609 | 963 | p = buffer_ptr(&c->input); |
964 | len = strlen(p); | |
6683b40f | 965 | debug2("channel %d: decode socks4: user %s/%d", c->self, p, len); |
0490e609 | 966 | if (len > have) |
28b9cb4d | 967 | fatal("channel %d: decode socks4: len %d > have %d", |
0490e609 | 968 | c->self, len, have); |
969 | strlcpy(username, p, sizeof(username)); | |
970 | buffer_consume(&c->input, len); | |
971 | buffer_consume(&c->input, 1); /* trailing '\0' */ | |
972 | ||
28b9cb4d | 973 | host = inet_ntoa(s4_req.dest_addr); |
0490e609 | 974 | strlcpy(c->path, host, sizeof(c->path)); |
975 | c->host_port = ntohs(s4_req.dest_port); | |
184eed6a | 976 | |
d7ac5f18 | 977 | debug2("channel %d: dynamic request: socks4 host %s port %u command %u", |
6683b40f | 978 | c->self, host, c->host_port, s4_req.command); |
0490e609 | 979 | |
28b9cb4d | 980 | if (s4_req.command != 1) { |
981 | debug("channel %d: cannot handle: socks4 cn %d", | |
982 | c->self, s4_req.command); | |
983 | return -1; | |
0490e609 | 984 | } |
28b9cb4d | 985 | s4_rsp.version = 0; /* vn: 0 for reply */ |
986 | s4_rsp.command = 90; /* cd: req granted */ | |
0490e609 | 987 | s4_rsp.dest_port = 0; /* ignored */ |
28b9cb4d | 988 | s4_rsp.dest_addr.s_addr = INADDR_ANY; /* ignored */ |
15dd2c4f | 989 | buffer_append(&c->output, &s4_rsp, sizeof(s4_rsp)); |
28b9cb4d | 990 | return 1; |
0490e609 | 991 | } |
992 | ||
f49658f5 | 993 | /* try to decode a socks5 header */ |
994 | #define SSH_SOCKS5_AUTHDONE 0x1000 | |
995 | #define SSH_SOCKS5_NOAUTH 0x00 | |
996 | #define SSH_SOCKS5_IPV4 0x01 | |
997 | #define SSH_SOCKS5_DOMAIN 0x03 | |
998 | #define SSH_SOCKS5_IPV6 0x04 | |
999 | #define SSH_SOCKS5_CONNECT 0x01 | |
1000 | #define SSH_SOCKS5_SUCCESS 0x00 | |
1001 | ||
1002 | static int | |
c8e9c167 | 1003 | channel_decode_socks5(Channel *c, fd_set *readset, fd_set *writeset) |
f49658f5 | 1004 | { |
1005 | struct { | |
1006 | u_int8_t version; | |
1007 | u_int8_t command; | |
1008 | u_int8_t reserved; | |
1009 | u_int8_t atyp; | |
1010 | } s5_req, s5_rsp; | |
1011 | u_int16_t dest_port; | |
1012 | u_char *p, dest_addr[255+1]; | |
2ceb8101 | 1013 | u_int have, i, found, nmethods, addrlen, af; |
f49658f5 | 1014 | |
1015 | debug2("channel %d: decode socks5", c->self); | |
1016 | p = buffer_ptr(&c->input); | |
1017 | if (p[0] != 0x05) | |
1018 | return -1; | |
1019 | have = buffer_len(&c->input); | |
1020 | if (!(c->flags & SSH_SOCKS5_AUTHDONE)) { | |
1021 | /* format: ver | nmethods | methods */ | |
aff51935 | 1022 | if (have < 2) |
f49658f5 | 1023 | return 0; |
1024 | nmethods = p[1]; | |
1025 | if (have < nmethods + 2) | |
1026 | return 0; | |
1027 | /* look for method: "NO AUTHENTICATION REQUIRED" */ | |
1028 | for (found = 0, i = 2 ; i < nmethods + 2; i++) { | |
1029 | if (p[i] == SSH_SOCKS5_NOAUTH ) { | |
1030 | found = 1; | |
1031 | break; | |
1032 | } | |
1033 | } | |
1034 | if (!found) { | |
1035 | debug("channel %d: method SSH_SOCKS5_NOAUTH not found", | |
1036 | c->self); | |
1037 | return -1; | |
1038 | } | |
1039 | buffer_consume(&c->input, nmethods + 2); | |
1040 | buffer_put_char(&c->output, 0x05); /* version */ | |
1041 | buffer_put_char(&c->output, SSH_SOCKS5_NOAUTH); /* method */ | |
1042 | FD_SET(c->sock, writeset); | |
1043 | c->flags |= SSH_SOCKS5_AUTHDONE; | |
1044 | debug2("channel %d: socks5 auth done", c->self); | |
1045 | return 0; /* need more */ | |
1046 | } | |
1047 | debug2("channel %d: socks5 post auth", c->self); | |
1048 | if (have < sizeof(s5_req)+1) | |
1049 | return 0; /* need more */ | |
5b5f6af7 | 1050 | memcpy(&s5_req, p, sizeof(s5_req)); |
f49658f5 | 1051 | if (s5_req.version != 0x05 || |
1052 | s5_req.command != SSH_SOCKS5_CONNECT || | |
1053 | s5_req.reserved != 0x00) { | |
d7ac5f18 | 1054 | debug2("channel %d: only socks5 connect supported", c->self); |
f49658f5 | 1055 | return -1; |
1056 | } | |
f8cc7664 | 1057 | switch (s5_req.atyp){ |
f49658f5 | 1058 | case SSH_SOCKS5_IPV4: |
1059 | addrlen = 4; | |
1060 | af = AF_INET; | |
1061 | break; | |
1062 | case SSH_SOCKS5_DOMAIN: | |
1063 | addrlen = p[sizeof(s5_req)]; | |
1064 | af = -1; | |
1065 | break; | |
1066 | case SSH_SOCKS5_IPV6: | |
1067 | addrlen = 16; | |
1068 | af = AF_INET6; | |
1069 | break; | |
1070 | default: | |
d7ac5f18 | 1071 | debug2("channel %d: bad socks5 atyp %d", c->self, s5_req.atyp); |
f49658f5 | 1072 | return -1; |
1073 | } | |
1074 | if (have < 4 + addrlen + 2) | |
1075 | return 0; | |
1076 | buffer_consume(&c->input, sizeof(s5_req)); | |
1077 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) | |
1078 | buffer_consume(&c->input, 1); /* host string length */ | |
1079 | buffer_get(&c->input, (char *)&dest_addr, addrlen); | |
1080 | buffer_get(&c->input, (char *)&dest_port, 2); | |
1081 | dest_addr[addrlen] = '\0'; | |
1082 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) | |
f6be21a0 | 1083 | strlcpy(c->path, (char *)dest_addr, sizeof(c->path)); |
f49658f5 | 1084 | else if (inet_ntop(af, dest_addr, c->path, sizeof(c->path)) == NULL) |
1085 | return -1; | |
1086 | c->host_port = ntohs(dest_port); | |
b6453d99 | 1087 | |
d7ac5f18 | 1088 | debug2("channel %d: dynamic request: socks5 host %s port %u command %u", |
f49658f5 | 1089 | c->self, c->path, c->host_port, s5_req.command); |
1090 | ||
1091 | s5_rsp.version = 0x05; | |
1092 | s5_rsp.command = SSH_SOCKS5_SUCCESS; | |
1093 | s5_rsp.reserved = 0; /* ignored */ | |
1094 | s5_rsp.atyp = SSH_SOCKS5_IPV4; | |
1095 | ((struct in_addr *)&dest_addr)->s_addr = INADDR_ANY; | |
1096 | dest_port = 0; /* ignored */ | |
1097 | ||
15dd2c4f | 1098 | buffer_append(&c->output, &s5_rsp, sizeof(s5_rsp)); |
1099 | buffer_append(&c->output, &dest_addr, sizeof(struct in_addr)); | |
1100 | buffer_append(&c->output, &dest_port, sizeof(dest_port)); | |
f49658f5 | 1101 | return 1; |
1102 | } | |
1103 | ||
28b9cb4d | 1104 | /* dynamic port forwarding */ |
396c147e | 1105 | static void |
c8e9c167 | 1106 | channel_pre_dynamic(Channel *c, fd_set *readset, fd_set *writeset) |
28b9cb4d | 1107 | { |
1108 | u_char *p; | |
2ceb8101 | 1109 | u_int have; |
1110 | int ret; | |
28b9cb4d | 1111 | |
1112 | have = buffer_len(&c->input); | |
639cb8ab | 1113 | c->delayed = 0; |
28b9cb4d | 1114 | debug2("channel %d: pre_dynamic: have %d", c->self, have); |
070adba2 | 1115 | /* buffer_dump(&c->input); */ |
28b9cb4d | 1116 | /* check if the fixed size part of the packet is in buffer. */ |
f49658f5 | 1117 | if (have < 3) { |
28b9cb4d | 1118 | /* need more */ |
1119 | FD_SET(c->sock, readset); | |
1120 | return; | |
1121 | } | |
1122 | /* try to guess the protocol */ | |
1123 | p = buffer_ptr(&c->input); | |
1124 | switch (p[0]) { | |
6683b40f | 1125 | case 0x04: |
1126 | ret = channel_decode_socks4(c, readset, writeset); | |
1127 | break; | |
f49658f5 | 1128 | case 0x05: |
1129 | ret = channel_decode_socks5(c, readset, writeset); | |
1130 | break; | |
28b9cb4d | 1131 | default: |
1132 | ret = -1; | |
1133 | break; | |
1134 | } | |
1135 | if (ret < 0) { | |
719fc62f | 1136 | chan_mark_dead(c); |
28b9cb4d | 1137 | } else if (ret == 0) { |
1138 | debug2("channel %d: pre_dynamic: need more", c->self); | |
1139 | /* need more */ | |
1140 | FD_SET(c->sock, readset); | |
1141 | } else { | |
1142 | /* switch to the next state */ | |
1143 | c->type = SSH_CHANNEL_OPENING; | |
1144 | port_open_helper(c, "direct-tcpip"); | |
1145 | } | |
1146 | } | |
0490e609 | 1147 | |
7368a6c8 | 1148 | /* This is our fake X11 server socket. */ |
396c147e | 1149 | static void |
c8e9c167 | 1150 | channel_post_x11_listener(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1151 | { |
719fc62f | 1152 | Channel *nc; |
7368a6c8 | 1153 | struct sockaddr addr; |
bcc0381e | 1154 | int newsock; |
7368a6c8 | 1155 | socklen_t addrlen; |
865ac82e | 1156 | char buf[16384], *remote_ipaddr; |
0b242b12 | 1157 | int remote_port; |
7368a6c8 | 1158 | |
1159 | if (FD_ISSET(c->sock, readset)) { | |
1160 | debug("X11 connection requested."); | |
1161 | addrlen = sizeof(addr); | |
1162 | newsock = accept(c->sock, &addr, &addrlen); | |
ac151b18 | 1163 | if (c->single_connection) { |
d7ac5f18 | 1164 | debug2("single_connection: closing X11 listener."); |
ac151b18 | 1165 | channel_close_fd(&c->sock); |
1166 | chan_mark_dead(c); | |
1167 | } | |
7368a6c8 | 1168 | if (newsock < 0) { |
1169 | error("accept: %.100s", strerror(errno)); | |
1170 | return; | |
5260325f | 1171 | } |
bcc0381e | 1172 | set_nodelay(newsock); |
865ac82e | 1173 | remote_ipaddr = get_peer_ipaddr(newsock); |
0b242b12 | 1174 | remote_port = get_peer_port(newsock); |
7368a6c8 | 1175 | snprintf(buf, sizeof buf, "X11 connection from %.200s port %d", |
865ac82e | 1176 | remote_ipaddr, remote_port); |
0b242b12 | 1177 | |
719fc62f | 1178 | nc = channel_new("accepted x11 socket", |
0b242b12 | 1179 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
0d942eff | 1180 | c->local_window_max, c->local_maxpacket, 0, buf, 1); |
0b242b12 | 1181 | if (compat20) { |
1182 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1183 | packet_put_cstring("x11"); | |
719fc62f | 1184 | packet_put_int(nc->self); |
ac151b18 | 1185 | packet_put_int(nc->local_window_max); |
1186 | packet_put_int(nc->local_maxpacket); | |
865ac82e | 1187 | /* originator ipaddr and port */ |
1188 | packet_put_cstring(remote_ipaddr); | |
d0c832f3 | 1189 | if (datafellows & SSH_BUG_X11FWD) { |
d7ac5f18 | 1190 | debug2("ssh2 x11 bug compat mode"); |
d0c832f3 | 1191 | } else { |
1192 | packet_put_int(remote_port); | |
1193 | } | |
0b242b12 | 1194 | packet_send(); |
1195 | } else { | |
1196 | packet_start(SSH_SMSG_X11_OPEN); | |
719fc62f | 1197 | packet_put_int(nc->self); |
8e7895b8 | 1198 | if (packet_get_protocol_flags() & |
1199 | SSH_PROTOFLAG_HOST_IN_FWD_OPEN) | |
449c5ba5 | 1200 | packet_put_cstring(buf); |
0b242b12 | 1201 | packet_send(); |
1202 | } | |
865ac82e | 1203 | xfree(remote_ipaddr); |
8efc0c15 | 1204 | } |
8efc0c15 | 1205 | } |
1206 | ||
396c147e | 1207 | static void |
0490e609 | 1208 | port_open_helper(Channel *c, char *rtype) |
1209 | { | |
1210 | int direct; | |
1211 | char buf[1024]; | |
1212 | char *remote_ipaddr = get_peer_ipaddr(c->sock); | |
29798ed0 | 1213 | int remote_port = get_peer_port(c->sock); |
0490e609 | 1214 | |
1215 | direct = (strcmp(rtype, "direct-tcpip") == 0); | |
1216 | ||
1217 | snprintf(buf, sizeof buf, | |
1218 | "%s: listening port %d for %.100s port %d, " | |
1219 | "connect from %.200s port %d", | |
1220 | rtype, c->listening_port, c->path, c->host_port, | |
1221 | remote_ipaddr, remote_port); | |
1222 | ||
1223 | xfree(c->remote_name); | |
1224 | c->remote_name = xstrdup(buf); | |
1225 | ||
1226 | if (compat20) { | |
1227 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1228 | packet_put_cstring(rtype); | |
1229 | packet_put_int(c->self); | |
1230 | packet_put_int(c->local_window_max); | |
1231 | packet_put_int(c->local_maxpacket); | |
1232 | if (direct) { | |
1233 | /* target host, port */ | |
1234 | packet_put_cstring(c->path); | |
1235 | packet_put_int(c->host_port); | |
1236 | } else { | |
1237 | /* listen address, port */ | |
1238 | packet_put_cstring(c->path); | |
1239 | packet_put_int(c->listening_port); | |
1240 | } | |
1241 | /* originator host and port */ | |
1242 | packet_put_cstring(remote_ipaddr); | |
29798ed0 | 1243 | packet_put_int((u_int)remote_port); |
0490e609 | 1244 | packet_send(); |
1245 | } else { | |
1246 | packet_start(SSH_MSG_PORT_OPEN); | |
1247 | packet_put_int(c->self); | |
1248 | packet_put_cstring(c->path); | |
1249 | packet_put_int(c->host_port); | |
8e7895b8 | 1250 | if (packet_get_protocol_flags() & |
1251 | SSH_PROTOFLAG_HOST_IN_FWD_OPEN) | |
0490e609 | 1252 | packet_put_cstring(c->remote_name); |
1253 | packet_send(); | |
1254 | } | |
1255 | xfree(remote_ipaddr); | |
1256 | } | |
1257 | ||
442aee3a | 1258 | static void |
1259 | channel_set_reuseaddr(int fd) | |
1260 | { | |
1261 | int on = 1; | |
1262 | ||
1263 | /* | |
1264 | * Set socket options. | |
1265 | * Allow local port reuse in TIME_WAIT. | |
1266 | */ | |
1267 | if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1) | |
1268 | error("setsockopt SO_REUSEADDR fd %d: %s", fd, strerror(errno)); | |
1269 | } | |
1270 | ||
aa3378df | 1271 | /* |
7368a6c8 | 1272 | * This socket is listening for connections to a forwarded TCP/IP port. |
aa3378df | 1273 | */ |
396c147e | 1274 | static void |
c8e9c167 | 1275 | channel_post_port_listener(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1276 | { |
0490e609 | 1277 | Channel *nc; |
7368a6c8 | 1278 | struct sockaddr addr; |
719fc62f | 1279 | int newsock, nextstate; |
7368a6c8 | 1280 | socklen_t addrlen; |
0490e609 | 1281 | char *rtype; |
fa08c86b | 1282 | |
7368a6c8 | 1283 | if (FD_ISSET(c->sock, readset)) { |
1284 | debug("Connection to port %d forwarding " | |
1285 | "to %.100s port %d requested.", | |
1286 | c->listening_port, c->path, c->host_port); | |
0490e609 | 1287 | |
639cb8ab | 1288 | if (c->type == SSH_CHANNEL_RPORT_LISTENER) { |
1289 | nextstate = SSH_CHANNEL_OPENING; | |
1290 | rtype = "forwarded-tcpip"; | |
1291 | } else { | |
1292 | if (c->host_port == 0) { | |
1293 | nextstate = SSH_CHANNEL_DYNAMIC; | |
f3964cb9 | 1294 | rtype = "dynamic-tcpip"; |
639cb8ab | 1295 | } else { |
1296 | nextstate = SSH_CHANNEL_OPENING; | |
1297 | rtype = "direct-tcpip"; | |
1298 | } | |
1299 | } | |
0490e609 | 1300 | |
7368a6c8 | 1301 | addrlen = sizeof(addr); |
1302 | newsock = accept(c->sock, &addr, &addrlen); | |
1303 | if (newsock < 0) { | |
1304 | error("accept: %.100s", strerror(errno)); | |
1305 | return; | |
1306 | } | |
811a6342 | 1307 | set_nodelay(newsock); |
0d942eff | 1308 | nc = channel_new(rtype, nextstate, newsock, newsock, -1, |
1309 | c->local_window_max, c->local_maxpacket, 0, rtype, 1); | |
0490e609 | 1310 | nc->listening_port = c->listening_port; |
1311 | nc->host_port = c->host_port; | |
1312 | strlcpy(nc->path, c->path, sizeof(nc->path)); | |
1313 | ||
639cb8ab | 1314 | if (nextstate == SSH_CHANNEL_DYNAMIC) { |
1315 | /* | |
1316 | * do not call the channel_post handler until | |
1317 | * this flag has been reset by a pre-handler. | |
1318 | * otherwise the FD_ISSET calls might overflow | |
1319 | */ | |
1320 | nc->delayed = 1; | |
1321 | } else { | |
0490e609 | 1322 | port_open_helper(nc, rtype); |
639cb8ab | 1323 | } |
7368a6c8 | 1324 | } |
1325 | } | |
8efc0c15 | 1326 | |
7368a6c8 | 1327 | /* |
1328 | * This is the authentication agent socket listening for connections from | |
1329 | * clients. | |
1330 | */ | |
396c147e | 1331 | static void |
c8e9c167 | 1332 | channel_post_auth_listener(Channel *c, fd_set *readset, fd_set *writeset) |
8efc0c15 | 1333 | { |
719fc62f | 1334 | Channel *nc; |
1335 | int newsock; | |
5260325f | 1336 | struct sockaddr addr; |
48e671d5 | 1337 | socklen_t addrlen; |
5260325f | 1338 | |
7368a6c8 | 1339 | if (FD_ISSET(c->sock, readset)) { |
1340 | addrlen = sizeof(addr); | |
1341 | newsock = accept(c->sock, &addr, &addrlen); | |
1342 | if (newsock < 0) { | |
1343 | error("accept from auth socket: %.100s", strerror(errno)); | |
1344 | return; | |
1345 | } | |
719fc62f | 1346 | nc = channel_new("accepted auth socket", |
fa08c86b | 1347 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
1348 | c->local_window_max, c->local_maxpacket, | |
0d942eff | 1349 | 0, "accepted auth socket", 1); |
fa08c86b | 1350 | if (compat20) { |
1351 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1352 | packet_put_cstring("auth-agent@openssh.com"); | |
719fc62f | 1353 | packet_put_int(nc->self); |
fa08c86b | 1354 | packet_put_int(c->local_window_max); |
1355 | packet_put_int(c->local_maxpacket); | |
1356 | } else { | |
1357 | packet_start(SSH_SMSG_AGENT_OPEN); | |
719fc62f | 1358 | packet_put_int(nc->self); |
fa08c86b | 1359 | } |
7368a6c8 | 1360 | packet_send(); |
1361 | } | |
1362 | } | |
5260325f | 1363 | |
396c147e | 1364 | static void |
c8e9c167 | 1365 | channel_post_connecting(Channel *c, fd_set *readset, fd_set *writeset) |
97fb6912 | 1366 | { |
d18e0850 | 1367 | int err = 0; |
8ab2cb35 | 1368 | socklen_t sz = sizeof(err); |
d18e0850 | 1369 | |
97fb6912 | 1370 | if (FD_ISSET(c->sock, writeset)) { |
db518d9b | 1371 | if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, &err, &sz) < 0) { |
d18e0850 | 1372 | err = errno; |
1373 | error("getsockopt SO_ERROR failed"); | |
1374 | } | |
1375 | if (err == 0) { | |
1376 | debug("channel %d: connected", c->self); | |
1377 | c->type = SSH_CHANNEL_OPEN; | |
1378 | if (compat20) { | |
1379 | packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1380 | packet_put_int(c->remote_id); | |
1381 | packet_put_int(c->self); | |
1382 | packet_put_int(c->local_window); | |
1383 | packet_put_int(c->local_maxpacket); | |
1384 | } else { | |
1385 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1386 | packet_put_int(c->remote_id); | |
1387 | packet_put_int(c->self); | |
1388 | } | |
97fb6912 | 1389 | } else { |
d18e0850 | 1390 | debug("channel %d: not connected: %s", |
1391 | c->self, strerror(err)); | |
1392 | if (compat20) { | |
1393 | packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); | |
1394 | packet_put_int(c->remote_id); | |
1395 | packet_put_int(SSH2_OPEN_CONNECT_FAILED); | |
1396 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { | |
1397 | packet_put_cstring(strerror(err)); | |
1398 | packet_put_cstring(""); | |
1399 | } | |
97fb6912 | 1400 | } else { |
d18e0850 | 1401 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
1402 | packet_put_int(c->remote_id); | |
97fb6912 | 1403 | } |
d18e0850 | 1404 | chan_mark_dead(c); |
97fb6912 | 1405 | } |
d18e0850 | 1406 | packet_send(); |
97fb6912 | 1407 | } |
1408 | } | |
1409 | ||
396c147e | 1410 | static int |
c8e9c167 | 1411 | channel_handle_rfd(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1412 | { |
fa1d7d85 | 1413 | char buf[CHAN_RBUF]; |
7368a6c8 | 1414 | int len; |
1415 | ||
6fd8622b | 1416 | if (c->rfd != -1 && |
7368a6c8 | 1417 | FD_ISSET(c->rfd, readset)) { |
ea8c44d9 | 1418 | errno = 0; |
7368a6c8 | 1419 | len = read(c->rfd, buf, sizeof(buf)); |
0fbe8c74 | 1420 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
1421 | return 1; | |
ea8c44d9 | 1422 | #ifndef PTY_ZEROREAD |
7368a6c8 | 1423 | if (len <= 0) { |
ea8c44d9 | 1424 | #else |
9c04d67d | 1425 | if ((!c->isatty && len <= 0) || |
1426 | (c->isatty && (len < 0 || (len == 0 && errno != 0)))) { | |
ea8c44d9 | 1427 | #endif |
d7ac5f18 | 1428 | debug2("channel %d: read<=0 rfd %d len %d", |
7368a6c8 | 1429 | c->self, c->rfd, len); |
28b9cb4d | 1430 | if (c->type != SSH_CHANNEL_OPEN) { |
d7ac5f18 | 1431 | debug2("channel %d: not open", c->self); |
719fc62f | 1432 | chan_mark_dead(c); |
0490e609 | 1433 | return -1; |
28b9cb4d | 1434 | } else if (compat13) { |
9c50edcf | 1435 | buffer_clear(&c->output); |
7368a6c8 | 1436 | c->type = SSH_CHANNEL_INPUT_DRAINING; |
d7ac5f18 | 1437 | debug2("channel %d: input draining.", c->self); |
7368a6c8 | 1438 | } else { |
1439 | chan_read_failed(c); | |
5260325f | 1440 | } |
7368a6c8 | 1441 | return -1; |
1442 | } | |
6aacefa7 | 1443 | if (c->input_filter != NULL) { |
2e73a022 | 1444 | if (c->input_filter(c, buf, len) == -1) { |
d7ac5f18 | 1445 | debug2("channel %d: filter stops", c->self); |
2e73a022 | 1446 | chan_read_failed(c); |
1447 | } | |
d20f3c9e | 1448 | } else if (c->datagram) { |
1449 | buffer_put_string(&c->input, buf, len); | |
2e73a022 | 1450 | } else { |
1451 | buffer_append(&c->input, buf, len); | |
1452 | } | |
7368a6c8 | 1453 | } |
1454 | return 1; | |
1455 | } | |
a7137f6b | 1456 | |
396c147e | 1457 | static int |
c8e9c167 | 1458 | channel_handle_wfd(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1459 | { |
95ce5599 | 1460 | struct termios tio; |
c1c6a032 | 1461 | u_char *data = NULL, *buf; |
780a9951 | 1462 | u_int dlen; |
7368a6c8 | 1463 | int len; |
1464 | ||
1465 | /* Send buffered output data to the socket. */ | |
6fd8622b | 1466 | if (c->wfd != -1 && |
7368a6c8 | 1467 | FD_ISSET(c->wfd, writeset) && |
1468 | buffer_len(&c->output) > 0) { | |
c1c6a032 | 1469 | if (c->output_filter != NULL) { |
1470 | if ((buf = c->output_filter(c, &data, &dlen)) == NULL) { | |
1471 | debug2("channel %d: filter stops", c->self); | |
d7b37427 | 1472 | if (c->type != SSH_CHANNEL_OPEN) |
1473 | chan_mark_dead(c); | |
1474 | else | |
1475 | chan_write_failed(c); | |
1476 | return -1; | |
c1c6a032 | 1477 | } |
1478 | } else if (c->datagram) { | |
1479 | buf = data = buffer_get_string(&c->output, &dlen); | |
1480 | } else { | |
1481 | buf = data = buffer_ptr(&c->output); | |
1482 | dlen = buffer_len(&c->output); | |
1483 | } | |
1484 | ||
d20f3c9e | 1485 | if (c->datagram) { |
d20f3c9e | 1486 | /* ignore truncated writes, datagrams might get lost */ |
1487 | c->local_consumed += dlen + 4; | |
c1c6a032 | 1488 | len = write(c->wfd, buf, dlen); |
d20f3c9e | 1489 | xfree(data); |
1490 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) | |
1491 | return 1; | |
1492 | if (len <= 0) { | |
1493 | if (c->type != SSH_CHANNEL_OPEN) | |
1494 | chan_mark_dead(c); | |
1495 | else | |
1496 | chan_write_failed(c); | |
1497 | return -1; | |
1498 | } | |
1499 | return 1; | |
1500 | } | |
64c0ce80 | 1501 | #ifdef _AIX |
aff51935 | 1502 | /* XXX: Later AIX versions can't push as much data to tty */ |
7fbb4189 | 1503 | if (compat20 && c->wfd_isatty) |
1504 | dlen = MIN(dlen, 8*1024); | |
64c0ce80 | 1505 | #endif |
c1c6a032 | 1506 | |
1507 | len = write(c->wfd, buf, dlen); | |
0fbe8c74 | 1508 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
1509 | return 1; | |
7368a6c8 | 1510 | if (len <= 0) { |
28b9cb4d | 1511 | if (c->type != SSH_CHANNEL_OPEN) { |
d7ac5f18 | 1512 | debug2("channel %d: not open", c->self); |
719fc62f | 1513 | chan_mark_dead(c); |
28b9cb4d | 1514 | return -1; |
1515 | } else if (compat13) { | |
9c50edcf | 1516 | buffer_clear(&c->output); |
d7ac5f18 | 1517 | debug2("channel %d: input draining.", c->self); |
7368a6c8 | 1518 | c->type = SSH_CHANNEL_INPUT_DRAINING; |
1519 | } else { | |
1520 | chan_write_failed(c); | |
5260325f | 1521 | } |
7368a6c8 | 1522 | return -1; |
1523 | } | |
c1c6a032 | 1524 | if (compat20 && c->isatty && dlen >= 1 && buf[0] != '\r') { |
0ae4fe1d | 1525 | if (tcgetattr(c->wfd, &tio) == 0 && |
1526 | !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) { | |
1527 | /* | |
1528 | * Simulate echo to reduce the impact of | |
355724fc | 1529 | * traffic analysis. We need to match the |
95ce5599 | 1530 | * size of a SSH2_MSG_CHANNEL_DATA message |
c1c6a032 | 1531 | * (4 byte channel id + buf) |
0ae4fe1d | 1532 | */ |
95ce5599 | 1533 | packet_send_ignore(4 + len); |
0ae4fe1d | 1534 | packet_send(); |
0ae4fe1d | 1535 | } |
1536 | } | |
7368a6c8 | 1537 | buffer_consume(&c->output, len); |
7e7327a1 | 1538 | if (compat20 && len > 0) { |
1539 | c->local_consumed += len; | |
1540 | } | |
1541 | } | |
1542 | return 1; | |
1543 | } | |
a7137f6b | 1544 | |
396c147e | 1545 | static int |
c8e9c167 | 1546 | channel_handle_efd(Channel *c, fd_set *readset, fd_set *writeset) |
7e7327a1 | 1547 | { |
fa1d7d85 | 1548 | char buf[CHAN_RBUF]; |
7e7327a1 | 1549 | int len; |
1550 | ||
8ce64345 | 1551 | /** XXX handle drain efd, too */ |
7e7327a1 | 1552 | if (c->efd != -1) { |
1553 | if (c->extended_usage == CHAN_EXTENDED_WRITE && | |
1554 | FD_ISSET(c->efd, writeset) && | |
1555 | buffer_len(&c->extended) > 0) { | |
1556 | len = write(c->efd, buffer_ptr(&c->extended), | |
1557 | buffer_len(&c->extended)); | |
de273eef | 1558 | debug2("channel %d: written %d to efd %d", |
7e7327a1 | 1559 | c->self, len, c->efd); |
ee55dacf | 1560 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
1561 | return 1; | |
1562 | if (len <= 0) { | |
1563 | debug2("channel %d: closing write-efd %d", | |
1564 | c->self, c->efd); | |
489aa2e9 | 1565 | channel_close_fd(&c->efd); |
ee55dacf | 1566 | } else { |
7e7327a1 | 1567 | buffer_consume(&c->extended, len); |
1568 | c->local_consumed += len; | |
1569 | } | |
1570 | } else if (c->extended_usage == CHAN_EXTENDED_READ && | |
1571 | FD_ISSET(c->efd, readset)) { | |
1572 | len = read(c->efd, buf, sizeof(buf)); | |
de273eef | 1573 | debug2("channel %d: read %d from efd %d", |
184eed6a | 1574 | c->self, len, c->efd); |
ee55dacf | 1575 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
1576 | return 1; | |
1577 | if (len <= 0) { | |
1578 | debug2("channel %d: closing read-efd %d", | |
8ce64345 | 1579 | c->self, c->efd); |
489aa2e9 | 1580 | channel_close_fd(&c->efd); |
ee55dacf | 1581 | } else { |
7e7327a1 | 1582 | buffer_append(&c->extended, buf, len); |
ee55dacf | 1583 | } |
7e7327a1 | 1584 | } |
1585 | } | |
1586 | return 1; | |
1587 | } | |
a7137f6b | 1588 | |
396c147e | 1589 | static int |
c8e9c167 | 1590 | channel_handle_ctl(Channel *c, fd_set *readset, fd_set *writeset) |
5e96b616 | 1591 | { |
1592 | char buf[16]; | |
1593 | int len; | |
1594 | ||
1595 | /* Monitor control fd to detect if the slave client exits */ | |
1596 | if (c->ctl_fd != -1 && FD_ISSET(c->ctl_fd, readset)) { | |
1597 | len = read(c->ctl_fd, buf, sizeof(buf)); | |
1598 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) | |
1599 | return 1; | |
1600 | if (len <= 0) { | |
1601 | debug2("channel %d: ctl read<=0", c->self); | |
1602 | if (c->type != SSH_CHANNEL_OPEN) { | |
1603 | debug2("channel %d: not open", c->self); | |
1604 | chan_mark_dead(c); | |
1605 | return -1; | |
1606 | } else { | |
1607 | chan_read_failed(c); | |
1608 | chan_write_failed(c); | |
1609 | } | |
1610 | return -1; | |
1611 | } else | |
1612 | fatal("%s: unexpected data on ctl fd", __func__); | |
1613 | } | |
1614 | return 1; | |
1615 | } | |
a7137f6b | 1616 | |
5e96b616 | 1617 | static int |
ee55dacf | 1618 | channel_check_window(Channel *c) |
7e7327a1 | 1619 | { |
28b9cb4d | 1620 | if (c->type == SSH_CHANNEL_OPEN && |
1621 | !(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) && | |
7e7327a1 | 1622 | c->local_window < c->local_window_max/2 && |
1623 | c->local_consumed > 0) { | |
1624 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); | |
1625 | packet_put_int(c->remote_id); | |
1626 | packet_put_int(c->local_consumed); | |
1627 | packet_send(); | |
de273eef | 1628 | debug2("channel %d: window %d sent adjust %d", |
7e7327a1 | 1629 | c->self, c->local_window, |
1630 | c->local_consumed); | |
1631 | c->local_window += c->local_consumed; | |
1632 | c->local_consumed = 0; | |
7368a6c8 | 1633 | } |
1634 | return 1; | |
1635 | } | |
5260325f | 1636 | |
396c147e | 1637 | static void |
c8e9c167 | 1638 | channel_post_open(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1639 | { |
639cb8ab | 1640 | if (c->delayed) |
1641 | return; | |
7368a6c8 | 1642 | channel_handle_rfd(c, readset, writeset); |
1643 | channel_handle_wfd(c, readset, writeset); | |
0c0738d5 | 1644 | if (!compat20) |
639cb8ab | 1645 | return; |
7e7327a1 | 1646 | channel_handle_efd(c, readset, writeset); |
5e96b616 | 1647 | channel_handle_ctl(c, readset, writeset); |
ee55dacf | 1648 | channel_check_window(c); |
7e7327a1 | 1649 | } |
1650 | ||
396c147e | 1651 | static void |
c8e9c167 | 1652 | channel_post_output_drain_13(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1653 | { |
1654 | int len; | |
e1feb9bf | 1655 | |
7368a6c8 | 1656 | /* Send buffered output data to the socket. */ |
1657 | if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) { | |
1658 | len = write(c->sock, buffer_ptr(&c->output), | |
1659 | buffer_len(&c->output)); | |
1660 | if (len <= 0) | |
9c50edcf | 1661 | buffer_clear(&c->output); |
7368a6c8 | 1662 | else |
1663 | buffer_consume(&c->output, len); | |
1664 | } | |
1665 | } | |
5260325f | 1666 | |
396c147e | 1667 | static void |
7e7327a1 | 1668 | channel_handler_init_20(void) |
1669 | { | |
0c0738d5 | 1670 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open; |
0b242b12 | 1671 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
7e7327a1 | 1672 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; |
fa08c86b | 1673 | channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener; |
0b242b12 | 1674 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
fa08c86b | 1675 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; |
97fb6912 | 1676 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1677 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7e7327a1 | 1678 | |
0c0738d5 | 1679 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
7e7327a1 | 1680 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; |
fa08c86b | 1681 | channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener; |
0b242b12 | 1682 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
fa08c86b | 1683 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; |
97fb6912 | 1684 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 1685 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
7e7327a1 | 1686 | } |
1687 | ||
396c147e | 1688 | static void |
7368a6c8 | 1689 | channel_handler_init_13(void) |
1690 | { | |
1691 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13; | |
1692 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_13; | |
1693 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; | |
1694 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; | |
1695 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; | |
1696 | channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining; | |
1697 | channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining; | |
97fb6912 | 1698 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1699 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7368a6c8 | 1700 | |
0c0738d5 | 1701 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
7368a6c8 | 1702 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
1703 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; | |
1704 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; | |
1705 | channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13; | |
97fb6912 | 1706 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 1707 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
7368a6c8 | 1708 | } |
5260325f | 1709 | |
396c147e | 1710 | static void |
7368a6c8 | 1711 | channel_handler_init_15(void) |
1712 | { | |
0c0738d5 | 1713 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open; |
0b242b12 | 1714 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
7368a6c8 | 1715 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
1716 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; | |
1717 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; | |
97fb6912 | 1718 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1719 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7368a6c8 | 1720 | |
1721 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; | |
1722 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; | |
1723 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; | |
0c0738d5 | 1724 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
97fb6912 | 1725 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 1726 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
7368a6c8 | 1727 | } |
1728 | ||
396c147e | 1729 | static void |
7368a6c8 | 1730 | channel_handler_init(void) |
1731 | { | |
1732 | int i; | |
e1feb9bf | 1733 | |
184eed6a | 1734 | for (i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) { |
7368a6c8 | 1735 | channel_pre[i] = NULL; |
1736 | channel_post[i] = NULL; | |
1737 | } | |
7e7327a1 | 1738 | if (compat20) |
1739 | channel_handler_init_20(); | |
1740 | else if (compat13) | |
7368a6c8 | 1741 | channel_handler_init_13(); |
1742 | else | |
1743 | channel_handler_init_15(); | |
1744 | } | |
1745 | ||
418e724c | 1746 | /* gc dead channels */ |
1747 | static void | |
1748 | channel_garbage_collect(Channel *c) | |
1749 | { | |
1750 | if (c == NULL) | |
1751 | return; | |
1752 | if (c->detach_user != NULL) { | |
8cd0437d | 1753 | if (!chan_is_dead(c, c->detach_close)) |
418e724c | 1754 | return; |
d7ac5f18 | 1755 | debug2("channel %d: gc: notify user", c->self); |
418e724c | 1756 | c->detach_user(c->self, NULL); |
1757 | /* if we still have a callback */ | |
1758 | if (c->detach_user != NULL) | |
1759 | return; | |
d7ac5f18 | 1760 | debug2("channel %d: gc: user detached", c->self); |
418e724c | 1761 | } |
1762 | if (!chan_is_dead(c, 1)) | |
1763 | return; | |
d7ac5f18 | 1764 | debug2("channel %d: garbage collecting", c->self); |
418e724c | 1765 | channel_free(c); |
1766 | } | |
1767 | ||
396c147e | 1768 | static void |
c8e9c167 | 1769 | channel_handler(chan_fn *ftab[], fd_set *readset, fd_set *writeset) |
7368a6c8 | 1770 | { |
1771 | static int did_init = 0; | |
9a995072 | 1772 | u_int i; |
7368a6c8 | 1773 | Channel *c; |
1774 | ||
1775 | if (!did_init) { | |
1776 | channel_handler_init(); | |
1777 | did_init = 1; | |
1778 | } | |
1779 | for (i = 0; i < channels_alloc; i++) { | |
719fc62f | 1780 | c = channels[i]; |
1781 | if (c == NULL) | |
5260325f | 1782 | continue; |
6fd8622b | 1783 | if (ftab[c->type] != NULL) |
1784 | (*ftab[c->type])(c, readset, writeset); | |
418e724c | 1785 | channel_garbage_collect(c); |
8efc0c15 | 1786 | } |
8efc0c15 | 1787 | } |
1788 | ||
8e7895b8 | 1789 | /* |
1790 | * Allocate/update select bitmasks and add any bits relevant to channels in | |
1791 | * select bitmasks. | |
1792 | */ | |
6ae2364d | 1793 | void |
c422989b | 1794 | channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp, |
9a995072 | 1795 | u_int *nallocp, int rekeying) |
7368a6c8 | 1796 | { |
c5d10563 | 1797 | u_int n, sz, nfdset; |
39929cdb | 1798 | |
1799 | n = MAX(*maxfdp, channel_max_fd); | |
1800 | ||
c5d10563 | 1801 | nfdset = howmany(n+1, NFDBITS); |
1802 | /* Explicitly test here, because xrealloc isn't always called */ | |
1803 | if (nfdset && SIZE_T_MAX / nfdset < sizeof(fd_mask)) | |
1804 | fatal("channel_prepare_select: max_fd (%d) is too large", n); | |
1805 | sz = nfdset * sizeof(fd_mask); | |
1806 | ||
489aa2e9 | 1807 | /* perhaps check sz < nalloc/2 and shrink? */ |
1808 | if (*readsetp == NULL || sz > *nallocp) { | |
c5d10563 | 1809 | *readsetp = xrealloc(*readsetp, nfdset, sizeof(fd_mask)); |
1810 | *writesetp = xrealloc(*writesetp, nfdset, sizeof(fd_mask)); | |
489aa2e9 | 1811 | *nallocp = sz; |
39929cdb | 1812 | } |
489aa2e9 | 1813 | *maxfdp = n; |
39929cdb | 1814 | memset(*readsetp, 0, sz); |
1815 | memset(*writesetp, 0, sz); | |
1816 | ||
c422989b | 1817 | if (!rekeying) |
1818 | channel_handler(channel_pre, *readsetp, *writesetp); | |
7368a6c8 | 1819 | } |
1820 | ||
8e7895b8 | 1821 | /* |
1822 | * After select, perform any appropriate operations for channels which have | |
1823 | * events pending. | |
1824 | */ | |
6ae2364d | 1825 | void |
c8e9c167 | 1826 | channel_after_select(fd_set *readset, fd_set *writeset) |
7368a6c8 | 1827 | { |
1828 | channel_handler(channel_post, readset, writeset); | |
1829 | } | |
1830 | ||
8e7895b8 | 1831 | |
39929cdb | 1832 | /* If there is data to send to the connection, enqueue some of it now. */ |
6ae2364d | 1833 | void |
d5bb9418 | 1834 | channel_output_poll(void) |
8efc0c15 | 1835 | { |
7368a6c8 | 1836 | Channel *c; |
9a995072 | 1837 | u_int i, len; |
5260325f | 1838 | |
1839 | for (i = 0; i < channels_alloc; i++) { | |
719fc62f | 1840 | c = channels[i]; |
1841 | if (c == NULL) | |
1842 | continue; | |
48e671d5 | 1843 | |
8e7895b8 | 1844 | /* |
1845 | * We are only interested in channels that can have buffered | |
1846 | * incoming data. | |
1847 | */ | |
48e671d5 | 1848 | if (compat13) { |
7368a6c8 | 1849 | if (c->type != SSH_CHANNEL_OPEN && |
1850 | c->type != SSH_CHANNEL_INPUT_DRAINING) | |
48e671d5 | 1851 | continue; |
1852 | } else { | |
7368a6c8 | 1853 | if (c->type != SSH_CHANNEL_OPEN) |
48e671d5 | 1854 | continue; |
48e671d5 | 1855 | } |
e78a59f5 | 1856 | if (compat20 && |
1857 | (c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) { | |
ee55dacf | 1858 | /* XXX is this true? */ |
418e724c | 1859 | debug3("channel %d: will not send data after close", c->self); |
7e7327a1 | 1860 | continue; |
1861 | } | |
5260325f | 1862 | |
1863 | /* Get the amount of buffered data for this channel. */ | |
ee55dacf | 1864 | if ((c->istate == CHAN_INPUT_OPEN || |
1865 | c->istate == CHAN_INPUT_WAIT_DRAIN) && | |
1866 | (len = buffer_len(&c->input)) > 0) { | |
d20f3c9e | 1867 | if (c->datagram) { |
1868 | if (len > 0) { | |
1869 | u_char *data; | |
1870 | u_int dlen; | |
1871 | ||
1872 | data = buffer_get_string(&c->input, | |
1873 | &dlen); | |
1874 | packet_start(SSH2_MSG_CHANNEL_DATA); | |
1875 | packet_put_int(c->remote_id); | |
1876 | packet_put_string(data, dlen); | |
1877 | packet_send(); | |
1878 | c->remote_window -= dlen + 4; | |
1879 | xfree(data); | |
1880 | } | |
1881 | continue; | |
1882 | } | |
8e7895b8 | 1883 | /* |
1884 | * Send some data for the other side over the secure | |
1885 | * connection. | |
1886 | */ | |
7e7327a1 | 1887 | if (compat20) { |
1888 | if (len > c->remote_window) | |
1889 | len = c->remote_window; | |
1890 | if (len > c->remote_maxpacket) | |
1891 | len = c->remote_maxpacket; | |
5260325f | 1892 | } else { |
7e7327a1 | 1893 | if (packet_is_interactive()) { |
1894 | if (len > 1024) | |
1895 | len = 512; | |
1896 | } else { | |
1897 | /* Keep the packets at reasonable size. */ | |
1898 | if (len > packet_get_maxsize()/2) | |
1899 | len = packet_get_maxsize()/2; | |
1900 | } | |
5260325f | 1901 | } |
7368a6c8 | 1902 | if (len > 0) { |
7e7327a1 | 1903 | packet_start(compat20 ? |
1904 | SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA); | |
7368a6c8 | 1905 | packet_put_int(c->remote_id); |
1906 | packet_put_string(buffer_ptr(&c->input), len); | |
1907 | packet_send(); | |
1908 | buffer_consume(&c->input, len); | |
1909 | c->remote_window -= len; | |
7368a6c8 | 1910 | } |
1911 | } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) { | |
5260325f | 1912 | if (compat13) |
1913 | fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3"); | |
aa3378df | 1914 | /* |
1915 | * input-buffer is empty and read-socket shutdown: | |
d2296ed7 | 1916 | * tell peer, that we will not send more data: send IEOF. |
1917 | * hack for extended data: delay EOF if EFD still in use. | |
aa3378df | 1918 | */ |
d2296ed7 | 1919 | if (CHANNEL_EFD_INPUT_ACTIVE(c)) |
4e2e5cfd | 1920 | debug2("channel %d: ibuf_empty delayed efd %d/(%d)", |
1921 | c->self, c->efd, buffer_len(&c->extended)); | |
d2296ed7 | 1922 | else |
1923 | chan_ibuf_empty(c); | |
5260325f | 1924 | } |
7e7327a1 | 1925 | /* Send extended data, i.e. stderr */ |
1926 | if (compat20 && | |
d2296ed7 | 1927 | !(c->flags & CHAN_EOF_SENT) && |
7e7327a1 | 1928 | c->remote_window > 0 && |
1929 | (len = buffer_len(&c->extended)) > 0 && | |
1930 | c->extended_usage == CHAN_EXTENDED_READ) { | |
f91d9a89 | 1931 | debug2("channel %d: rwin %u elen %u euse %d", |
ee55dacf | 1932 | c->self, c->remote_window, buffer_len(&c->extended), |
1933 | c->extended_usage); | |
7e7327a1 | 1934 | if (len > c->remote_window) |
1935 | len = c->remote_window; | |
1936 | if (len > c->remote_maxpacket) | |
1937 | len = c->remote_maxpacket; | |
1938 | packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA); | |
1939 | packet_put_int(c->remote_id); | |
1940 | packet_put_int(SSH2_EXTENDED_DATA_STDERR); | |
1941 | packet_put_string(buffer_ptr(&c->extended), len); | |
1942 | packet_send(); | |
1943 | buffer_consume(&c->extended, len); | |
1944 | c->remote_window -= len; | |
ee55dacf | 1945 | debug2("channel %d: sent ext data %d", c->self, len); |
7e7327a1 | 1946 | } |
8efc0c15 | 1947 | } |
8efc0c15 | 1948 | } |
1949 | ||
8e7895b8 | 1950 | |
1951 | /* -- protocol input */ | |
04aa9e67 | 1952 | |
1953 | /* ARGSUSED */ | |
6ae2364d | 1954 | void |
7819b5c3 | 1955 | channel_input_data(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 1956 | { |
48e671d5 | 1957 | int id; |
5260325f | 1958 | char *data; |
1e3b8b07 | 1959 | u_int data_len; |
7368a6c8 | 1960 | Channel *c; |
5260325f | 1961 | |
1962 | /* Get the channel number and verify it. */ | |
48e671d5 | 1963 | id = packet_get_int(); |
7368a6c8 | 1964 | c = channel_lookup(id); |
1965 | if (c == NULL) | |
48e671d5 | 1966 | packet_disconnect("Received data for nonexistent channel %d.", id); |
5260325f | 1967 | |
1968 | /* Ignore any data for non-open channels (might happen on close) */ | |
7368a6c8 | 1969 | if (c->type != SSH_CHANNEL_OPEN && |
1970 | c->type != SSH_CHANNEL_X11_OPEN) | |
48e671d5 | 1971 | return; |
1972 | ||
5260325f | 1973 | /* Get the data. */ |
1974 | data = packet_get_string(&data_len); | |
7368a6c8 | 1975 | |
7741e239 | 1976 | /* |
1977 | * Ignore data for protocol > 1.3 if output end is no longer open. | |
1978 | * For protocol 2 the sending side is reducing its window as it sends | |
1979 | * data, so we must 'fake' consumption of the data in order to ensure | |
1980 | * that window updates are sent back. Otherwise the connection might | |
1981 | * deadlock. | |
1982 | */ | |
1983 | if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN) { | |
1984 | if (compat20) { | |
1985 | c->local_window -= data_len; | |
1986 | c->local_consumed += data_len; | |
1987 | } | |
1988 | xfree(data); | |
1989 | return; | |
1990 | } | |
1991 | ||
6aacefa7 | 1992 | if (compat20) { |
7e7327a1 | 1993 | if (data_len > c->local_maxpacket) { |
bbe88b6d | 1994 | logit("channel %d: rcvd big packet %d, maxpack %d", |
7e7327a1 | 1995 | c->self, data_len, c->local_maxpacket); |
1996 | } | |
1997 | if (data_len > c->local_window) { | |
bbe88b6d | 1998 | logit("channel %d: rcvd too much data %d, win %d", |
7e7327a1 | 1999 | c->self, data_len, c->local_window); |
2000 | xfree(data); | |
2001 | return; | |
2002 | } | |
2003 | c->local_window -= data_len; | |
7e7327a1 | 2004 | } |
95500969 | 2005 | packet_check_eom(); |
d20f3c9e | 2006 | if (c->datagram) |
2007 | buffer_put_string(&c->output, data, data_len); | |
2008 | else | |
2009 | buffer_append(&c->output, data, data_len); | |
5260325f | 2010 | xfree(data); |
8efc0c15 | 2011 | } |
8e7895b8 | 2012 | |
04aa9e67 | 2013 | /* ARGSUSED */ |
6ae2364d | 2014 | void |
7819b5c3 | 2015 | channel_input_extended_data(int type, u_int32_t seq, void *ctxt) |
7e7327a1 | 2016 | { |
2017 | int id; | |
7e7327a1 | 2018 | char *data; |
a594fa74 | 2019 | u_int data_len, tcode; |
7e7327a1 | 2020 | Channel *c; |
2021 | ||
2022 | /* Get the channel number and verify it. */ | |
2023 | id = packet_get_int(); | |
2024 | c = channel_lookup(id); | |
2025 | ||
2026 | if (c == NULL) | |
2027 | packet_disconnect("Received extended_data for bad channel %d.", id); | |
2028 | if (c->type != SSH_CHANNEL_OPEN) { | |
bbe88b6d | 2029 | logit("channel %d: ext data for non open", id); |
7e7327a1 | 2030 | return; |
2031 | } | |
d2296ed7 | 2032 | if (c->flags & CHAN_EOF_RCVD) { |
2033 | if (datafellows & SSH_BUG_EXTEOF) | |
2034 | debug("channel %d: accepting ext data after eof", id); | |
2035 | else | |
2036 | packet_disconnect("Received extended_data after EOF " | |
2037 | "on channel %d.", id); | |
2038 | } | |
7e7327a1 | 2039 | tcode = packet_get_int(); |
2040 | if (c->efd == -1 || | |
2041 | c->extended_usage != CHAN_EXTENDED_WRITE || | |
2042 | tcode != SSH2_EXTENDED_DATA_STDERR) { | |
bbe88b6d | 2043 | logit("channel %d: bad ext data", c->self); |
7e7327a1 | 2044 | return; |
2045 | } | |
2046 | data = packet_get_string(&data_len); | |
95500969 | 2047 | packet_check_eom(); |
7e7327a1 | 2048 | if (data_len > c->local_window) { |
bbe88b6d | 2049 | logit("channel %d: rcvd too much extended_data %d, win %d", |
7e7327a1 | 2050 | c->self, data_len, c->local_window); |
2051 | xfree(data); | |
2052 | return; | |
2053 | } | |
de273eef | 2054 | debug2("channel %d: rcvd ext data %d", c->self, data_len); |
7e7327a1 | 2055 | c->local_window -= data_len; |
2056 | buffer_append(&c->extended, data, data_len); | |
2057 | xfree(data); | |
2058 | } | |
2059 | ||
04aa9e67 | 2060 | /* ARGSUSED */ |
6ae2364d | 2061 | void |
7819b5c3 | 2062 | channel_input_ieof(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 2063 | { |
2064 | int id; | |
2065 | Channel *c; | |
2066 | ||
7368a6c8 | 2067 | id = packet_get_int(); |
95500969 | 2068 | packet_check_eom(); |
7368a6c8 | 2069 | c = channel_lookup(id); |
2070 | if (c == NULL) | |
2071 | packet_disconnect("Received ieof for nonexistent channel %d.", id); | |
2072 | chan_rcvd_ieof(c); | |
a5f82435 | 2073 | |
2074 | /* XXX force input close */ | |
8341f420 | 2075 | if (c->force_drain && c->istate == CHAN_INPUT_OPEN) { |
a5f82435 | 2076 | debug("channel %d: FORCE input drain", c->self); |
2077 | c->istate = CHAN_INPUT_WAIT_DRAIN; | |
32e7d71f | 2078 | if (buffer_len(&c->input) == 0) |
2079 | chan_ibuf_empty(c); | |
a5f82435 | 2080 | } |
2081 | ||
7368a6c8 | 2082 | } |
8efc0c15 | 2083 | |
04aa9e67 | 2084 | /* ARGSUSED */ |
6ae2364d | 2085 | void |
7819b5c3 | 2086 | channel_input_close(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2087 | { |
7368a6c8 | 2088 | int id; |
2089 | Channel *c; | |
5260325f | 2090 | |
7368a6c8 | 2091 | id = packet_get_int(); |
95500969 | 2092 | packet_check_eom(); |
7368a6c8 | 2093 | c = channel_lookup(id); |
2094 | if (c == NULL) | |
2095 | packet_disconnect("Received close for nonexistent channel %d.", id); | |
aa3378df | 2096 | |
2097 | /* | |
2098 | * Send a confirmation that we have closed the channel and no more | |
2099 | * data is coming for it. | |
2100 | */ | |
5260325f | 2101 | packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION); |
7368a6c8 | 2102 | packet_put_int(c->remote_id); |
5260325f | 2103 | packet_send(); |
2104 | ||
aa3378df | 2105 | /* |
2106 | * If the channel is in closed state, we have sent a close request, | |
2107 | * and the other side will eventually respond with a confirmation. | |
2108 | * Thus, we cannot free the channel here, because then there would be | |
2109 | * no-one to receive the confirmation. The channel gets freed when | |
2110 | * the confirmation arrives. | |
2111 | */ | |
7368a6c8 | 2112 | if (c->type != SSH_CHANNEL_CLOSED) { |
aa3378df | 2113 | /* |
2114 | * Not a closed channel - mark it as draining, which will | |
2115 | * cause it to be freed later. | |
2116 | */ | |
9c50edcf | 2117 | buffer_clear(&c->input); |
7368a6c8 | 2118 | c->type = SSH_CHANNEL_OUTPUT_DRAINING; |
5260325f | 2119 | } |
8efc0c15 | 2120 | } |
2121 | ||
7368a6c8 | 2122 | /* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */ |
04aa9e67 | 2123 | /* ARGSUSED */ |
6ae2364d | 2124 | void |
7819b5c3 | 2125 | channel_input_oclose(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2126 | { |
7368a6c8 | 2127 | int id = packet_get_int(); |
2128 | Channel *c = channel_lookup(id); | |
a8a21a53 | 2129 | |
95500969 | 2130 | packet_check_eom(); |
7368a6c8 | 2131 | if (c == NULL) |
2132 | packet_disconnect("Received oclose for nonexistent channel %d.", id); | |
2133 | chan_rcvd_oclose(c); | |
8efc0c15 | 2134 | } |
2135 | ||
04aa9e67 | 2136 | /* ARGSUSED */ |
6ae2364d | 2137 | void |
7819b5c3 | 2138 | channel_input_close_confirmation(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 2139 | { |
2140 | int id = packet_get_int(); | |
2141 | Channel *c = channel_lookup(id); | |
2142 | ||
95500969 | 2143 | packet_check_eom(); |
7368a6c8 | 2144 | if (c == NULL) |
2145 | packet_disconnect("Received close confirmation for " | |
2146 | "out-of-range channel %d.", id); | |
2147 | if (c->type != SSH_CHANNEL_CLOSED) | |
2148 | packet_disconnect("Received close confirmation for " | |
2149 | "non-closed channel %d (type %d).", id, c->type); | |
719fc62f | 2150 | channel_free(c); |
7368a6c8 | 2151 | } |
8efc0c15 | 2152 | |
04aa9e67 | 2153 | /* ARGSUSED */ |
6ae2364d | 2154 | void |
7819b5c3 | 2155 | channel_input_open_confirmation(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2156 | { |
7368a6c8 | 2157 | int id, remote_id; |
2158 | Channel *c; | |
5260325f | 2159 | |
7368a6c8 | 2160 | id = packet_get_int(); |
2161 | c = channel_lookup(id); | |
5260325f | 2162 | |
7368a6c8 | 2163 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) |
2164 | packet_disconnect("Received open confirmation for " | |
2165 | "non-opening channel %d.", id); | |
2166 | remote_id = packet_get_int(); | |
aa3378df | 2167 | /* Record the remote channel number and mark that the channel is now open. */ |
7368a6c8 | 2168 | c->remote_id = remote_id; |
2169 | c->type = SSH_CHANNEL_OPEN; | |
7e7327a1 | 2170 | |
2171 | if (compat20) { | |
2172 | c->remote_window = packet_get_int(); | |
2173 | c->remote_maxpacket = packet_get_int(); | |
05ca0898 | 2174 | if (c->confirm) { |
de273eef | 2175 | debug2("callback start"); |
5e96b616 | 2176 | c->confirm(c->self, c->confirm_ctx); |
de273eef | 2177 | debug2("callback done"); |
7e7327a1 | 2178 | } |
d7ac5f18 | 2179 | debug2("channel %d: open confirm rwindow %u rmax %u", c->self, |
7e7327a1 | 2180 | c->remote_window, c->remote_maxpacket); |
2181 | } | |
95500969 | 2182 | packet_check_eom(); |
8efc0c15 | 2183 | } |
2184 | ||
396c147e | 2185 | static char * |
d18e0850 | 2186 | reason2txt(int reason) |
2187 | { | |
6aacefa7 | 2188 | switch (reason) { |
d18e0850 | 2189 | case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED: |
2190 | return "administratively prohibited"; | |
2191 | case SSH2_OPEN_CONNECT_FAILED: | |
2192 | return "connect failed"; | |
2193 | case SSH2_OPEN_UNKNOWN_CHANNEL_TYPE: | |
2194 | return "unknown channel type"; | |
2195 | case SSH2_OPEN_RESOURCE_SHORTAGE: | |
2196 | return "resource shortage"; | |
2197 | } | |
7e8c18e9 | 2198 | return "unknown reason"; |
d18e0850 | 2199 | } |
2200 | ||
04aa9e67 | 2201 | /* ARGSUSED */ |
6ae2364d | 2202 | void |
7819b5c3 | 2203 | channel_input_open_failure(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2204 | { |
02a024dd | 2205 | int id, reason; |
2206 | char *msg = NULL, *lang = NULL; | |
7368a6c8 | 2207 | Channel *c; |
5260325f | 2208 | |
7368a6c8 | 2209 | id = packet_get_int(); |
2210 | c = channel_lookup(id); | |
2211 | ||
2212 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) | |
2213 | packet_disconnect("Received open failure for " | |
2214 | "non-opening channel %d.", id); | |
7e7327a1 | 2215 | if (compat20) { |
02a024dd | 2216 | reason = packet_get_int(); |
fbe90f7b | 2217 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { |
02a024dd | 2218 | msg = packet_get_string(NULL); |
2219 | lang = packet_get_string(NULL); | |
2220 | } | |
bbe88b6d | 2221 | logit("channel %d: open failed: %s%s%s", id, |
d18e0850 | 2222 | reason2txt(reason), msg ? ": ": "", msg ? msg : ""); |
02a024dd | 2223 | if (msg != NULL) |
2224 | xfree(msg); | |
2225 | if (lang != NULL) | |
2226 | xfree(lang); | |
7e7327a1 | 2227 | } |
95500969 | 2228 | packet_check_eom(); |
5260325f | 2229 | /* Free the channel. This will also close the socket. */ |
719fc62f | 2230 | channel_free(c); |
8efc0c15 | 2231 | } |
2232 | ||
04aa9e67 | 2233 | /* ARGSUSED */ |
8e7895b8 | 2234 | void |
7819b5c3 | 2235 | channel_input_window_adjust(int type, u_int32_t seq, void *ctxt) |
8e7895b8 | 2236 | { |
2237 | Channel *c; | |
f91d9a89 | 2238 | int id; |
2239 | u_int adjust; | |
3ffc6336 | 2240 | |
8e7895b8 | 2241 | if (!compat20) |
2242 | return; | |
8efc0c15 | 2243 | |
8e7895b8 | 2244 | /* Get the channel number and verify it. */ |
2245 | id = packet_get_int(); | |
2246 | c = channel_lookup(id); | |
2247 | ||
b872f7f0 | 2248 | if (c == NULL) { |
2249 | logit("Received window adjust for non-open channel %d.", id); | |
8e7895b8 | 2250 | return; |
2251 | } | |
2252 | adjust = packet_get_int(); | |
95500969 | 2253 | packet_check_eom(); |
f91d9a89 | 2254 | debug2("channel %d: rcvd adjust %u", id, adjust); |
8e7895b8 | 2255 | c->remote_window += adjust; |
2256 | } | |
2257 | ||
04aa9e67 | 2258 | /* ARGSUSED */ |
8e7895b8 | 2259 | void |
7819b5c3 | 2260 | channel_input_port_open(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2261 | { |
8e7895b8 | 2262 | Channel *c = NULL; |
2263 | u_short host_port; | |
2264 | char *host, *originator_string; | |
2265 | int remote_id, sock = -1; | |
5260325f | 2266 | |
8e7895b8 | 2267 | remote_id = packet_get_int(); |
2268 | host = packet_get_string(NULL); | |
2269 | host_port = packet_get_int(); | |
2270 | ||
2271 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) { | |
2272 | originator_string = packet_get_string(NULL); | |
2273 | } else { | |
2274 | originator_string = xstrdup("unknown (remote did not supply name)"); | |
2275 | } | |
95500969 | 2276 | packet_check_eom(); |
8e7895b8 | 2277 | sock = channel_connect_to(host, host_port); |
2278 | if (sock != -1) { | |
2279 | c = channel_new("connected socket", | |
2280 | SSH_CHANNEL_CONNECTING, sock, sock, -1, 0, 0, 0, | |
2281 | originator_string, 1); | |
3a0d3d54 | 2282 | c->remote_id = remote_id; |
5260325f | 2283 | } |
0d942eff | 2284 | xfree(originator_string); |
8e7895b8 | 2285 | if (c == NULL) { |
2286 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
2287 | packet_put_int(remote_id); | |
2288 | packet_send(); | |
2289 | } | |
2290 | xfree(host); | |
8efc0c15 | 2291 | } |
2292 | ||
8e7895b8 | 2293 | |
2294 | /* -- tcp forwarding */ | |
2295 | ||
5e4a7219 | 2296 | void |
2297 | channel_set_af(int af) | |
2298 | { | |
2299 | IPv4or6 = af; | |
2300 | } | |
2301 | ||
5641aefa | 2302 | static int |
2303 | channel_setup_fwd_listener(int type, const char *listen_addr, u_short listen_port, | |
2304 | const char *host_to_connect, u_short port_to_connect, int gateway_ports) | |
8efc0c15 | 2305 | { |
719fc62f | 2306 | Channel *c; |
442aee3a | 2307 | int sock, r, success = 0, wildcard = 0, is_client; |
48e671d5 | 2308 | struct addrinfo hints, *ai, *aitop; |
3867aa0a | 2309 | const char *host, *addr; |
5641aefa | 2310 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
5260325f | 2311 | |
5641aefa | 2312 | host = (type == SSH_CHANNEL_RPORT_LISTENER) ? |
2313 | listen_addr : host_to_connect; | |
3867aa0a | 2314 | is_client = (type == SSH_CHANNEL_PORT_LISTENER); |
02a024dd | 2315 | |
5641aefa | 2316 | if (host == NULL) { |
2317 | error("No forward host name."); | |
38946c65 | 2318 | return 0; |
fa08c86b | 2319 | } |
719fc62f | 2320 | if (strlen(host) > SSH_CHANNEL_PATH_LEN - 1) { |
02a024dd | 2321 | error("Forward host name too long."); |
38946c65 | 2322 | return 0; |
02a024dd | 2323 | } |
5260325f | 2324 | |
3867aa0a | 2325 | /* |
2326 | * Determine whether or not a port forward listens to loopback, | |
f8cc7664 | 2327 | * specified address or wildcard. On the client, a specified bind |
2328 | * address will always override gateway_ports. On the server, a | |
2329 | * gateway_ports of 1 (``yes'') will override the client's | |
2330 | * specification and force a wildcard bind, whereas a value of 2 | |
2331 | * (``clientspecified'') will bind to whatever address the client | |
3867aa0a | 2332 | * asked for. |
2333 | * | |
2334 | * Special-case listen_addrs are: | |
2335 | * | |
2336 | * "0.0.0.0" -> wildcard v4/v6 if SSH_OLD_FORWARD_ADDR | |
2337 | * "" (empty string), "*" -> wildcard v4/v6 | |
2338 | * "localhost" -> loopback v4/v6 | |
2339 | */ | |
2340 | addr = NULL; | |
2341 | if (listen_addr == NULL) { | |
2342 | /* No address specified: default to gateway_ports setting */ | |
2343 | if (gateway_ports) | |
2344 | wildcard = 1; | |
2345 | } else if (gateway_ports || is_client) { | |
2346 | if (((datafellows & SSH_OLD_FORWARD_ADDR) && | |
2347 | strcmp(listen_addr, "0.0.0.0") == 0) || | |
2348 | *listen_addr == '\0' || strcmp(listen_addr, "*") == 0 || | |
2349 | (!is_client && gateway_ports == 1)) | |
2350 | wildcard = 1; | |
2351 | else if (strcmp(listen_addr, "localhost") != 0) | |
2352 | addr = listen_addr; | |
2353 | } | |
2354 | ||
2355 | debug3("channel_setup_fwd_listener: type %d wildcard %d addr %s", | |
2356 | type, wildcard, (addr == NULL) ? "NULL" : addr); | |
2357 | ||
aa3378df | 2358 | /* |
48e671d5 | 2359 | * getaddrinfo returns a loopback address if the hostname is |
2360 | * set to NULL and hints.ai_flags is not AI_PASSIVE | |
aa3378df | 2361 | */ |
48e671d5 | 2362 | memset(&hints, 0, sizeof(hints)); |
2363 | hints.ai_family = IPv4or6; | |
3867aa0a | 2364 | hints.ai_flags = wildcard ? AI_PASSIVE : 0; |
48e671d5 | 2365 | hints.ai_socktype = SOCK_STREAM; |
fa08c86b | 2366 | snprintf(strport, sizeof strport, "%d", listen_port); |
3867aa0a | 2367 | if ((r = getaddrinfo(addr, strport, &hints, &aitop)) != 0) { |
2368 | if (addr == NULL) { | |
2369 | /* This really shouldn't happen */ | |
2370 | packet_disconnect("getaddrinfo: fatal error: %s", | |
2371 | gai_strerror(r)); | |
2372 | } else { | |
38946c65 | 2373 | error("channel_setup_fwd_listener: " |
3867aa0a | 2374 | "getaddrinfo(%.64s): %s", addr, gai_strerror(r)); |
2375 | } | |
38946c65 | 2376 | return 0; |
3867aa0a | 2377 | } |
48e671d5 | 2378 | |
48e671d5 | 2379 | for (ai = aitop; ai; ai = ai->ai_next) { |
2380 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
2381 | continue; | |
2382 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), | |
2383 | strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { | |
5641aefa | 2384 | error("channel_setup_fwd_listener: getnameinfo failed"); |
48e671d5 | 2385 | continue; |
2386 | } | |
2387 | /* Create a port to listen for the host. */ | |
3e131a6d | 2388 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
48e671d5 | 2389 | if (sock < 0) { |
2390 | /* this is no error since kernel may not support ipv6 */ | |
2391 | verbose("socket: %.100s", strerror(errno)); | |
2392 | continue; | |
2393 | } | |
442aee3a | 2394 | |
2395 | channel_set_reuseaddr(sock); | |
facfd613 | 2396 | |
48e671d5 | 2397 | debug("Local forwarding listening on %s port %s.", ntop, strport); |
2398 | ||
2399 | /* Bind the socket to the address. */ | |
2400 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { | |
2401 | /* address can be in use ipv6 address is already bound */ | |
16218745 | 2402 | if (!ai->ai_next) |
2403 | error("bind: %.100s", strerror(errno)); | |
2404 | else | |
2405 | verbose("bind: %.100s", strerror(errno)); | |
2b87da3b | 2406 | |
48e671d5 | 2407 | close(sock); |
2408 | continue; | |
2409 | } | |
2410 | /* Start listening for connections on the socket. */ | |
fce39749 | 2411 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { |
48e671d5 | 2412 | error("listen: %.100s", strerror(errno)); |
2413 | close(sock); | |
2414 | continue; | |
2415 | } | |
2416 | /* Allocate a channel number for the socket. */ | |
8e7895b8 | 2417 | c = channel_new("port listener", type, sock, sock, -1, |
0b242b12 | 2418 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, |
0d942eff | 2419 | 0, "port listener", 1); |
719fc62f | 2420 | strlcpy(c->path, host, sizeof(c->path)); |
2421 | c->host_port = port_to_connect; | |
2422 | c->listening_port = listen_port; | |
48e671d5 | 2423 | success = 1; |
2424 | } | |
2425 | if (success == 0) | |
5641aefa | 2426 | error("channel_setup_fwd_listener: cannot listen to port: %d", |
02a024dd | 2427 | listen_port); |
48e671d5 | 2428 | freeaddrinfo(aitop); |
02a024dd | 2429 | return success; |
5260325f | 2430 | } |
8efc0c15 | 2431 | |
d740ec16 | 2432 | int |
2433 | channel_cancel_rport_listener(const char *host, u_short port) | |
2434 | { | |
9a995072 | 2435 | u_int i; |
2436 | int found = 0; | |
d740ec16 | 2437 | |
f8cc7664 | 2438 | for (i = 0; i < channels_alloc; i++) { |
d740ec16 | 2439 | Channel *c = channels[i]; |
2440 | ||
2441 | if (c != NULL && c->type == SSH_CHANNEL_RPORT_LISTENER && | |
2442 | strncmp(c->path, host, sizeof(c->path)) == 0 && | |
f2107e97 | 2443 | c->listening_port == port) { |
2912cbd6 | 2444 | debug2("%s: close channel %d", __func__, i); |
d740ec16 | 2445 | channel_free(c); |
2446 | found = 1; | |
2447 | } | |
2448 | } | |
2449 | ||
2450 | return (found); | |
2451 | } | |
2452 | ||
5641aefa | 2453 | /* protocol local port fwd, used by ssh (and sshd in v1) */ |
2454 | int | |
3867aa0a | 2455 | channel_setup_local_fwd_listener(const char *listen_host, u_short listen_port, |
5641aefa | 2456 | const char *host_to_connect, u_short port_to_connect, int gateway_ports) |
2457 | { | |
2458 | return channel_setup_fwd_listener(SSH_CHANNEL_PORT_LISTENER, | |
3867aa0a | 2459 | listen_host, listen_port, host_to_connect, port_to_connect, |
2460 | gateway_ports); | |
5641aefa | 2461 | } |
2462 | ||
2463 | /* protocol v2 remote port fwd, used by sshd */ | |
2464 | int | |
2465 | channel_setup_remote_fwd_listener(const char *listen_address, | |
2466 | u_short listen_port, int gateway_ports) | |
2467 | { | |
2468 | return channel_setup_fwd_listener(SSH_CHANNEL_RPORT_LISTENER, | |
2469 | listen_address, listen_port, NULL, 0, gateway_ports); | |
2470 | } | |
2471 | ||
aa3378df | 2472 | /* |
2473 | * Initiate forwarding of connections to port "port" on remote host through | |
2474 | * the secure channel to host:port from local side. | |
2475 | */ | |
8efc0c15 | 2476 | |
6ae2364d | 2477 | void |
3867aa0a | 2478 | channel_request_remote_forwarding(const char *listen_host, u_short listen_port, |
fa08c86b | 2479 | const char *host_to_connect, u_short port_to_connect) |
8efc0c15 | 2480 | { |
54a5250f | 2481 | int type, success = 0; |
fa08c86b | 2482 | |
5260325f | 2483 | /* Record locally that connection to this host/port is permitted. */ |
2484 | if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
2485 | fatal("channel_request_remote_forwarding: too many forwards"); | |
2486 | ||
5260325f | 2487 | /* Send the forward request to the remote side. */ |
7e7327a1 | 2488 | if (compat20) { |
3867aa0a | 2489 | const char *address_to_bind; |
2490 | if (listen_host == NULL) | |
2491 | address_to_bind = "localhost"; | |
2492 | else if (*listen_host == '\0' || strcmp(listen_host, "*") == 0) | |
2493 | address_to_bind = ""; | |
2494 | else | |
2495 | address_to_bind = listen_host; | |
2496 | ||
7e7327a1 | 2497 | packet_start(SSH2_MSG_GLOBAL_REQUEST); |
2498 | packet_put_cstring("tcpip-forward"); | |
e0ae8728 | 2499 | packet_put_char(1); /* boolean: want reply */ |
7e7327a1 | 2500 | packet_put_cstring(address_to_bind); |
2501 | packet_put_int(listen_port); | |
fa08c86b | 2502 | packet_send(); |
2503 | packet_write_wait(); | |
2504 | /* Assume that server accepts the request */ | |
2505 | success = 1; | |
7e7327a1 | 2506 | } else { |
2507 | packet_start(SSH_CMSG_PORT_FORWARD_REQUEST); | |
7e7327a1 | 2508 | packet_put_int(listen_port); |
d6f24e45 | 2509 | packet_put_cstring(host_to_connect); |
2510 | packet_put_int(port_to_connect); | |
7e7327a1 | 2511 | packet_send(); |
2512 | packet_write_wait(); | |
fa08c86b | 2513 | |
2514 | /* Wait for response from the remote side. */ | |
54a5250f | 2515 | type = packet_read(); |
fa08c86b | 2516 | switch (type) { |
2517 | case SSH_SMSG_SUCCESS: | |
2518 | success = 1; | |
2519 | break; | |
2520 | case SSH_SMSG_FAILURE: | |
bbe88b6d | 2521 | logit("Warning: Server denied remote port forwarding."); |
fa08c86b | 2522 | break; |
2523 | default: | |
2524 | /* Unknown packet */ | |
2525 | packet_disconnect("Protocol error for port forward request:" | |
2526 | "received packet type %d.", type); | |
2527 | } | |
2528 | } | |
2529 | if (success) { | |
2530 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host_to_connect); | |
2531 | permitted_opens[num_permitted_opens].port_to_connect = port_to_connect; | |
2532 | permitted_opens[num_permitted_opens].listen_port = listen_port; | |
2533 | num_permitted_opens++; | |
7e7327a1 | 2534 | } |
8efc0c15 | 2535 | } |
2536 | ||
d740ec16 | 2537 | /* |
f2107e97 | 2538 | * Request cancellation of remote forwarding of connection host:port from |
d740ec16 | 2539 | * local side. |
2540 | */ | |
d740ec16 | 2541 | void |
3867aa0a | 2542 | channel_request_rforward_cancel(const char *host, u_short port) |
d740ec16 | 2543 | { |
2544 | int i; | |
d740ec16 | 2545 | |
2546 | if (!compat20) | |
2547 | return; | |
2548 | ||
2549 | for (i = 0; i < num_permitted_opens; i++) { | |
f2107e97 | 2550 | if (permitted_opens[i].host_to_connect != NULL && |
d740ec16 | 2551 | permitted_opens[i].listen_port == port) |
2552 | break; | |
2553 | } | |
2554 | if (i >= num_permitted_opens) { | |
2555 | debug("%s: requested forward not found", __func__); | |
2556 | return; | |
2557 | } | |
2558 | packet_start(SSH2_MSG_GLOBAL_REQUEST); | |
2559 | packet_put_cstring("cancel-tcpip-forward"); | |
2560 | packet_put_char(0); | |
3867aa0a | 2561 | packet_put_cstring(host == NULL ? "" : host); |
d740ec16 | 2562 | packet_put_int(port); |
2563 | packet_send(); | |
2564 | ||
2565 | permitted_opens[i].listen_port = 0; | |
2566 | permitted_opens[i].port_to_connect = 0; | |
8c4bd764 | 2567 | xfree(permitted_opens[i].host_to_connect); |
d740ec16 | 2568 | permitted_opens[i].host_to_connect = NULL; |
2569 | } | |
2570 | ||
aa3378df | 2571 | /* |
2572 | * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates | |
2573 | * listening for the port, and sends back a success reply (or disconnect | |
2574 | * message if there was an error). This never returns if there was an error. | |
2575 | */ | |
6ae2364d | 2576 | void |
1d1ffb87 | 2577 | channel_input_port_forward_request(int is_root, int gateway_ports) |
8efc0c15 | 2578 | { |
57112b5a | 2579 | u_short port, host_port; |
5260325f | 2580 | char *hostname; |
2581 | ||
2582 | /* Get arguments from the packet. */ | |
2583 | port = packet_get_int(); | |
2584 | hostname = packet_get_string(NULL); | |
2585 | host_port = packet_get_int(); | |
2586 | ||
3c62e7eb | 2587 | #ifndef HAVE_CYGWIN |
aa3378df | 2588 | /* |
2589 | * Check that an unprivileged user is not trying to forward a | |
2590 | * privileged port. | |
2591 | */ | |
5260325f | 2592 | if (port < IPPORT_RESERVED && !is_root) |
8e7c9afc | 2593 | packet_disconnect( |
2594 | "Requested forwarding of port %d but user is not root.", | |
2595 | port); | |
2596 | if (host_port == 0) | |
2597 | packet_disconnect("Dynamic forwarding denied."); | |
3c62e7eb | 2598 | #endif |
8e7c9afc | 2599 | |
fa08c86b | 2600 | /* Initiate forwarding */ |
3867aa0a | 2601 | channel_setup_local_fwd_listener(NULL, port, hostname, |
2602 | host_port, gateway_ports); | |
5260325f | 2603 | |
2604 | /* Free the argument string. */ | |
2605 | xfree(hostname); | |
8efc0c15 | 2606 | } |
2607 | ||
01794848 | 2608 | /* |
2609 | * Permits opening to any host/port if permitted_opens[] is empty. This is | |
2610 | * usually called by the server, because the user could connect to any port | |
2611 | * anyway, and the server has no way to know but to trust the client anyway. | |
2612 | */ | |
2613 | void | |
d5bb9418 | 2614 | channel_permit_all_opens(void) |
01794848 | 2615 | { |
2616 | if (num_permitted_opens == 0) | |
2617 | all_opens_permitted = 1; | |
2618 | } | |
2619 | ||
cd332296 | 2620 | void |
01794848 | 2621 | channel_add_permitted_opens(char *host, int port) |
2622 | { | |
2623 | if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
2624 | fatal("channel_request_remote_forwarding: too many forwards"); | |
2625 | debug("allow port forwarding to host %s port %d", host, port); | |
2626 | ||
2627 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host); | |
2628 | permitted_opens[num_permitted_opens].port_to_connect = port; | |
2629 | num_permitted_opens++; | |
2630 | ||
2631 | all_opens_permitted = 0; | |
2632 | } | |
2633 | ||
cd332296 | 2634 | void |
01794848 | 2635 | channel_clear_permitted_opens(void) |
2636 | { | |
2637 | int i; | |
2638 | ||
2639 | for (i = 0; i < num_permitted_opens; i++) | |
d740ec16 | 2640 | if (permitted_opens[i].host_to_connect != NULL) |
2641 | xfree(permitted_opens[i].host_to_connect); | |
01794848 | 2642 | num_permitted_opens = 0; |
2643 | ||
2644 | } | |
2645 | ||
01794848 | 2646 | /* return socket to remote host, port */ |
396c147e | 2647 | static int |
01794848 | 2648 | connect_to(const char *host, u_short port) |
8efc0c15 | 2649 | { |
48e671d5 | 2650 | struct addrinfo hints, *ai, *aitop; |
2651 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; | |
2652 | int gaierr; | |
7368a6c8 | 2653 | int sock = -1; |
48e671d5 | 2654 | |
2655 | memset(&hints, 0, sizeof(hints)); | |
2656 | hints.ai_family = IPv4or6; | |
2657 | hints.ai_socktype = SOCK_STREAM; | |
01794848 | 2658 | snprintf(strport, sizeof strport, "%d", port); |
48e671d5 | 2659 | if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) { |
01794848 | 2660 | error("connect_to %.100s: unknown host (%s)", host, |
2661 | gai_strerror(gaierr)); | |
7368a6c8 | 2662 | return -1; |
48e671d5 | 2663 | } |
48e671d5 | 2664 | for (ai = aitop; ai; ai = ai->ai_next) { |
2665 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
2666 | continue; | |
2667 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), | |
2668 | strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { | |
01794848 | 2669 | error("connect_to: getnameinfo failed"); |
48e671d5 | 2670 | continue; |
5260325f | 2671 | } |
3e131a6d | 2672 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
48e671d5 | 2673 | if (sock < 0) { |
4940c411 | 2674 | if (ai->ai_next == NULL) |
2675 | error("socket: %.100s", strerror(errno)); | |
2676 | else | |
2677 | verbose("socket: %.100s", strerror(errno)); | |
48e671d5 | 2678 | continue; |
5260325f | 2679 | } |
170694d7 | 2680 | if (set_nonblock(sock) == -1) |
2681 | fatal("%s: set_nonblock(%d)", __func__, sock); | |
97fb6912 | 2682 | if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0 && |
2683 | errno != EINPROGRESS) { | |
01794848 | 2684 | error("connect_to %.100s port %s: %.100s", ntop, strport, |
48e671d5 | 2685 | strerror(errno)); |
2686 | close(sock); | |
2b87da3b | 2687 | continue; /* fail -- try next */ |
48e671d5 | 2688 | } |
2689 | break; /* success */ | |
5260325f | 2690 | |
5260325f | 2691 | } |
48e671d5 | 2692 | freeaddrinfo(aitop); |
48e671d5 | 2693 | if (!ai) { |
01794848 | 2694 | error("connect_to %.100s port %d: failed.", host, port); |
7368a6c8 | 2695 | return -1; |
8efc0c15 | 2696 | } |
7368a6c8 | 2697 | /* success */ |
811a6342 | 2698 | set_nodelay(sock); |
7368a6c8 | 2699 | return sock; |
2700 | } | |
01794848 | 2701 | |
fa08c86b | 2702 | int |
b3f8a79c | 2703 | channel_connect_by_listen_address(u_short listen_port) |
fa08c86b | 2704 | { |
2705 | int i; | |
01794848 | 2706 | |
fa08c86b | 2707 | for (i = 0; i < num_permitted_opens; i++) |
d740ec16 | 2708 | if (permitted_opens[i].host_to_connect != NULL && |
2709 | permitted_opens[i].listen_port == listen_port) | |
01794848 | 2710 | return connect_to( |
fa08c86b | 2711 | permitted_opens[i].host_to_connect, |
2712 | permitted_opens[i].port_to_connect); | |
0b6fbf03 | 2713 | error("WARNING: Server requests forwarding for unknown listen_port %d", |
2714 | listen_port); | |
fa08c86b | 2715 | return -1; |
2716 | } | |
48e671d5 | 2717 | |
01794848 | 2718 | /* Check if connecting to that port is permitted and connect. */ |
2719 | int | |
2720 | channel_connect_to(const char *host, u_short port) | |
2721 | { | |
2722 | int i, permit; | |
2723 | ||
2724 | permit = all_opens_permitted; | |
2725 | if (!permit) { | |
2726 | for (i = 0; i < num_permitted_opens; i++) | |
d740ec16 | 2727 | if (permitted_opens[i].host_to_connect != NULL && |
2728 | permitted_opens[i].port_to_connect == port && | |
01794848 | 2729 | strcmp(permitted_opens[i].host_to_connect, host) == 0) |
2730 | permit = 1; | |
2731 | ||
2732 | } | |
2733 | if (!permit) { | |
bbe88b6d | 2734 | logit("Received request to connect to host %.100s port %d, " |
01794848 | 2735 | "but the request was denied.", host, port); |
2736 | return -1; | |
2737 | } | |
2738 | return connect_to(host, port); | |
2739 | } | |
2740 | ||
5e96b616 | 2741 | void |
2742 | channel_send_window_changes(void) | |
2743 | { | |
9a995072 | 2744 | u_int i; |
5e96b616 | 2745 | struct winsize ws; |
2746 | ||
2747 | for (i = 0; i < channels_alloc; i++) { | |
f8cc7664 | 2748 | if (channels[i] == NULL || !channels[i]->client_tty || |
5e96b616 | 2749 | channels[i]->type != SSH_CHANNEL_OPEN) |
2750 | continue; | |
2751 | if (ioctl(channels[i]->rfd, TIOCGWINSZ, &ws) < 0) | |
2752 | continue; | |
2753 | channel_request_start(i, "window-change", 0); | |
148de80c | 2754 | packet_put_int((u_int)ws.ws_col); |
2755 | packet_put_int((u_int)ws.ws_row); | |
2756 | packet_put_int((u_int)ws.ws_xpixel); | |
2757 | packet_put_int((u_int)ws.ws_ypixel); | |
5e96b616 | 2758 | packet_send(); |
2759 | } | |
2760 | } | |
2761 | ||
8e7895b8 | 2762 | /* -- X11 forwarding */ |
8efc0c15 | 2763 | |
aa3378df | 2764 | /* |
2765 | * Creates an internet domain socket for listening for X11 connections. | |
57f228e8 | 2766 | * Returns 0 and a suitable display number for the DISPLAY variable |
2767 | * stored in display_numberp , or -1 if an error occurs. | |
aa3378df | 2768 | */ |
c9d0ad9b | 2769 | int |
e6e573bd | 2770 | x11_create_display_inet(int x11_display_offset, int x11_use_localhost, |
d08341e6 | 2771 | int single_connection, u_int *display_numberp, int **chanids) |
8efc0c15 | 2772 | { |
ac151b18 | 2773 | Channel *nc = NULL; |
57112b5a | 2774 | int display_number, sock; |
2775 | u_short port; | |
48e671d5 | 2776 | struct addrinfo hints, *ai, *aitop; |
2777 | char strport[NI_MAXSERV]; | |
2778 | int gaierr, n, num_socks = 0, socks[NUM_SOCKS]; | |
5260325f | 2779 | |
59e5aff5 | 2780 | if (chanids == NULL) |
2781 | return -1; | |
2782 | ||
95f1eccc | 2783 | for (display_number = x11_display_offset; |
184eed6a | 2784 | display_number < MAX_DISPLAYS; |
2785 | display_number++) { | |
5260325f | 2786 | port = 6000 + display_number; |
48e671d5 | 2787 | memset(&hints, 0, sizeof(hints)); |
2788 | hints.ai_family = IPv4or6; | |
e6e573bd | 2789 | hints.ai_flags = x11_use_localhost ? 0: AI_PASSIVE; |
48e671d5 | 2790 | hints.ai_socktype = SOCK_STREAM; |
2791 | snprintf(strport, sizeof strport, "%d", port); | |
2792 | if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) { | |
2793 | error("getaddrinfo: %.100s", gai_strerror(gaierr)); | |
c9d0ad9b | 2794 | return -1; |
5260325f | 2795 | } |
48e671d5 | 2796 | for (ai = aitop; ai; ai = ai->ai_next) { |
2797 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
2798 | continue; | |
3e131a6d | 2799 | sock = socket(ai->ai_family, ai->ai_socktype, |
2800 | ai->ai_protocol); | |
48e671d5 | 2801 | if (sock < 0) { |
4ee81249 | 2802 | if ((errno != EINVAL) && (errno != EAFNOSUPPORT)) { |
80a44451 | 2803 | error("socket: %.100s", strerror(errno)); |
0ea89f7e | 2804 | freeaddrinfo(aitop); |
c9d0ad9b | 2805 | return -1; |
80a44451 | 2806 | } else { |
22d89d24 | 2807 | debug("x11_create_display_inet: Socket family %d not supported", |
2808 | ai->ai_family); | |
80a44451 | 2809 | continue; |
2810 | } | |
48e671d5 | 2811 | } |
688aaeda | 2812 | #ifdef IPV6_V6ONLY |
2813 | if (ai->ai_family == AF_INET6) { | |
2814 | int on = 1; | |
2815 | if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) < 0) | |
2816 | error("setsockopt IPV6_V6ONLY: %.100s", strerror(errno)); | |
2817 | } | |
2818 | #endif | |
442aee3a | 2819 | channel_set_reuseaddr(sock); |
48e671d5 | 2820 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { |
d7ac5f18 | 2821 | debug2("bind port %d: %.100s", port, strerror(errno)); |
48e671d5 | 2822 | close(sock); |
16218745 | 2823 | |
2824 | if (ai->ai_next) | |
2825 | continue; | |
2826 | ||
48e671d5 | 2827 | for (n = 0; n < num_socks; n++) { |
48e671d5 | 2828 | close(socks[n]); |
2829 | } | |
2830 | num_socks = 0; | |
2831 | break; | |
2832 | } | |
2833 | socks[num_socks++] = sock; | |
80faa19f | 2834 | #ifndef DONT_TRY_OTHER_AF |
48e671d5 | 2835 | if (num_socks == NUM_SOCKS) |
2836 | break; | |
80faa19f | 2837 | #else |
688aaeda | 2838 | if (x11_use_localhost) { |
2839 | if (num_socks == NUM_SOCKS) | |
2840 | break; | |
2841 | } else { | |
2842 | break; | |
2843 | } | |
80faa19f | 2844 | #endif |
5260325f | 2845 | } |
4ccb01d6 | 2846 | freeaddrinfo(aitop); |
48e671d5 | 2847 | if (num_socks > 0) |
2848 | break; | |
5260325f | 2849 | } |
2850 | if (display_number >= MAX_DISPLAYS) { | |
2851 | error("Failed to allocate internet-domain X11 display socket."); | |
c9d0ad9b | 2852 | return -1; |
8efc0c15 | 2853 | } |
5260325f | 2854 | /* Start listening for connections on the socket. */ |
48e671d5 | 2855 | for (n = 0; n < num_socks; n++) { |
2856 | sock = socks[n]; | |
fce39749 | 2857 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { |
48e671d5 | 2858 | error("listen: %.100s", strerror(errno)); |
48e671d5 | 2859 | close(sock); |
c9d0ad9b | 2860 | return -1; |
a7effaac | 2861 | } |
a7effaac | 2862 | } |
5260325f | 2863 | |
48e671d5 | 2864 | /* Allocate a channel for each socket. */ |
52e3daed | 2865 | *chanids = xcalloc(num_socks + 1, sizeof(**chanids)); |
48e671d5 | 2866 | for (n = 0; n < num_socks; n++) { |
2867 | sock = socks[n]; | |
ac151b18 | 2868 | nc = channel_new("x11 listener", |
0b242b12 | 2869 | SSH_CHANNEL_X11_LISTENER, sock, sock, -1, |
2870 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, | |
0d942eff | 2871 | 0, "X11 inet listener", 1); |
3a0d3d54 | 2872 | nc->single_connection = single_connection; |
59e5aff5 | 2873 | (*chanids)[n] = nc->self; |
48e671d5 | 2874 | } |
59e5aff5 | 2875 | (*chanids)[n] = -1; |
5260325f | 2876 | |
c9d0ad9b | 2877 | /* Return the display number for the DISPLAY environment variable. */ |
57f228e8 | 2878 | *display_numberp = display_number; |
2879 | return (0); | |
8efc0c15 | 2880 | } |
2881 | ||
396c147e | 2882 | static int |
1e3b8b07 | 2883 | connect_local_xsocket(u_int dnr) |
8efc0c15 | 2884 | { |
5260325f | 2885 | int sock; |
2886 | struct sockaddr_un addr; | |
5260325f | 2887 | |
805e659f | 2888 | sock = socket(AF_UNIX, SOCK_STREAM, 0); |
2889 | if (sock < 0) | |
2890 | error("socket: %.100s", strerror(errno)); | |
2891 | memset(&addr, 0, sizeof(addr)); | |
2892 | addr.sun_family = AF_UNIX; | |
2893 | snprintf(addr.sun_path, sizeof addr.sun_path, _PATH_UNIX_X, dnr); | |
32596c7b | 2894 | if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) == 0) |
805e659f | 2895 | return sock; |
2896 | close(sock); | |
5260325f | 2897 | error("connect %.100s: %.100s", addr.sun_path, strerror(errno)); |
2898 | return -1; | |
8efc0c15 | 2899 | } |
2900 | ||
0b242b12 | 2901 | int |
2902 | x11_connect_display(void) | |
8efc0c15 | 2903 | { |
4f16046f | 2904 | u_int display_number; |
5260325f | 2905 | const char *display; |
0b242b12 | 2906 | char buf[1024], *cp; |
48e671d5 | 2907 | struct addrinfo hints, *ai, *aitop; |
2908 | char strport[NI_MAXSERV]; | |
4f16046f | 2909 | int gaierr, sock = 0; |
5260325f | 2910 | |
5260325f | 2911 | /* Try to open a socket for the local X server. */ |
2912 | display = getenv("DISPLAY"); | |
2913 | if (!display) { | |
2914 | error("DISPLAY not set."); | |
0b242b12 | 2915 | return -1; |
5260325f | 2916 | } |
aa3378df | 2917 | /* |
2918 | * Now we decode the value of the DISPLAY variable and make a | |
2919 | * connection to the real X server. | |
2920 | */ | |
2921 | ||
2922 | /* | |
2923 | * Check if it is a unix domain socket. Unix domain displays are in | |
2924 | * one of the following formats: unix:d[.s], :d[.s], ::d[.s] | |
2925 | */ | |
5260325f | 2926 | if (strncmp(display, "unix:", 5) == 0 || |
2927 | display[0] == ':') { | |
2928 | /* Connect to the unix domain socket. */ | |
4f16046f | 2929 | if (sscanf(strrchr(display, ':') + 1, "%u", &display_number) != 1) { |
5260325f | 2930 | error("Could not parse display number from DISPLAY: %.100s", |
184eed6a | 2931 | display); |
0b242b12 | 2932 | return -1; |
5260325f | 2933 | } |
2934 | /* Create a socket. */ | |
2935 | sock = connect_local_xsocket(display_number); | |
2936 | if (sock < 0) | |
0b242b12 | 2937 | return -1; |
5260325f | 2938 | |
2939 | /* OK, we now have a connection to the display. */ | |
0b242b12 | 2940 | return sock; |
5260325f | 2941 | } |
aa3378df | 2942 | /* |
2943 | * Connect to an inet socket. The DISPLAY value is supposedly | |
2944 | * hostname:d[.s], where hostname may also be numeric IP address. | |
2945 | */ | |
74860245 | 2946 | strlcpy(buf, display, sizeof(buf)); |
5260325f | 2947 | cp = strchr(buf, ':'); |
2948 | if (!cp) { | |
2949 | error("Could not find ':' in DISPLAY: %.100s", display); | |
0b242b12 | 2950 | return -1; |
5260325f | 2951 | } |
2952 | *cp = 0; | |
aa3378df | 2953 | /* buf now contains the host name. But first we parse the display number. */ |
4f16046f | 2954 | if (sscanf(cp + 1, "%u", &display_number) != 1) { |
5260325f | 2955 | error("Could not parse display number from DISPLAY: %.100s", |
184eed6a | 2956 | display); |
0b242b12 | 2957 | return -1; |
5260325f | 2958 | } |
5260325f | 2959 | |
48e671d5 | 2960 | /* Look up the host address */ |
2961 | memset(&hints, 0, sizeof(hints)); | |
2962 | hints.ai_family = IPv4or6; | |
2963 | hints.ai_socktype = SOCK_STREAM; | |
4f16046f | 2964 | snprintf(strport, sizeof strport, "%u", 6000 + display_number); |
48e671d5 | 2965 | if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) { |
2966 | error("%.100s: unknown host. (%s)", buf, gai_strerror(gaierr)); | |
0b242b12 | 2967 | return -1; |
8efc0c15 | 2968 | } |
48e671d5 | 2969 | for (ai = aitop; ai; ai = ai->ai_next) { |
2970 | /* Create a socket. */ | |
3e131a6d | 2971 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
48e671d5 | 2972 | if (sock < 0) { |
d7ac5f18 | 2973 | debug2("socket: %.100s", strerror(errno)); |
7368a6c8 | 2974 | continue; |
2975 | } | |
2976 | /* Connect it to the display. */ | |
2977 | if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) { | |
4f16046f | 2978 | debug2("connect %.100s port %u: %.100s", buf, |
7368a6c8 | 2979 | 6000 + display_number, strerror(errno)); |
2980 | close(sock); | |
2981 | continue; | |
2982 | } | |
2983 | /* Success */ | |
2984 | break; | |
48e671d5 | 2985 | } |
48e671d5 | 2986 | freeaddrinfo(aitop); |
2987 | if (!ai) { | |
4f16046f | 2988 | error("connect %.100s port %u: %.100s", buf, 6000 + display_number, |
48e671d5 | 2989 | strerror(errno)); |
0b242b12 | 2990 | return -1; |
8efc0c15 | 2991 | } |
bcc0381e | 2992 | set_nodelay(sock); |
0b242b12 | 2993 | return sock; |
2994 | } | |
5260325f | 2995 | |
0b242b12 | 2996 | /* |
2997 | * This is called when SSH_SMSG_X11_OPEN is received. The packet contains | |
2998 | * the remote channel number. We should do whatever we want, and respond | |
2999 | * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE. | |
3000 | */ | |
5260325f | 3001 | |
0b242b12 | 3002 | void |
7819b5c3 | 3003 | x11_input_open(int type, u_int32_t seq, void *ctxt) |
0b242b12 | 3004 | { |
719fc62f | 3005 | Channel *c = NULL; |
3006 | int remote_id, sock = 0; | |
0b242b12 | 3007 | char *remote_host; |
5260325f | 3008 | |
719fc62f | 3009 | debug("Received X11 open request."); |
5260325f | 3010 | |
719fc62f | 3011 | remote_id = packet_get_int(); |
8e7895b8 | 3012 | |
3013 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) { | |
719fc62f | 3014 | remote_host = packet_get_string(NULL); |
0b242b12 | 3015 | } else { |
3016 | remote_host = xstrdup("unknown (remote did not supply name)"); | |
0b242b12 | 3017 | } |
95500969 | 3018 | packet_check_eom(); |
0b242b12 | 3019 | |
3020 | /* Obtain a connection to the real X display. */ | |
3021 | sock = x11_connect_display(); | |
719fc62f | 3022 | if (sock != -1) { |
3023 | /* Allocate a channel for this connection. */ | |
3024 | c = channel_new("connected x11 socket", | |
3025 | SSH_CHANNEL_X11_OPEN, sock, sock, -1, 0, 0, 0, | |
3026 | remote_host, 1); | |
3a0d3d54 | 3027 | c->remote_id = remote_id; |
3028 | c->force_drain = 1; | |
719fc62f | 3029 | } |
0d942eff | 3030 | xfree(remote_host); |
719fc62f | 3031 | if (c == NULL) { |
0b242b12 | 3032 | /* Send refusal to the remote host. */ |
3033 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
719fc62f | 3034 | packet_put_int(remote_id); |
0b242b12 | 3035 | } else { |
0b242b12 | 3036 | /* Send a confirmation to the remote host. */ |
3037 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
719fc62f | 3038 | packet_put_int(remote_id); |
3039 | packet_put_int(c->self); | |
0b242b12 | 3040 | } |
719fc62f | 3041 | packet_send(); |
8efc0c15 | 3042 | } |
3043 | ||
a22aff1f | 3044 | /* dummy protocol handler that denies SSH-1 requests (agent/x11) */ |
3045 | void | |
7819b5c3 | 3046 | deny_input_open(int type, u_int32_t seq, void *ctxt) |
a22aff1f | 3047 | { |
3048 | int rchan = packet_get_int(); | |
e1feb9bf | 3049 | |
6aacefa7 | 3050 | switch (type) { |
a22aff1f | 3051 | case SSH_SMSG_AGENT_OPEN: |
3052 | error("Warning: ssh server tried agent forwarding."); | |
3053 | break; | |
3054 | case SSH_SMSG_X11_OPEN: | |
3055 | error("Warning: ssh server tried X11 forwarding."); | |
3056 | break; | |
3057 | default: | |
7819b5c3 | 3058 | error("deny_input_open: type %d", type); |
a22aff1f | 3059 | break; |
3060 | } | |
1908529f | 3061 | error("Warning: this is probably a break-in attempt by a malicious server."); |
a22aff1f | 3062 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
3063 | packet_put_int(rchan); | |
3064 | packet_send(); | |
3065 | } | |
3066 | ||
aa3378df | 3067 | /* |
3068 | * Requests forwarding of X11 connections, generates fake authentication | |
3069 | * data, and enables authentication spoofing. | |
8e7895b8 | 3070 | * This should be called in the client only. |
aa3378df | 3071 | */ |
6ae2364d | 3072 | void |
9bf083eb | 3073 | x11_request_forwarding_with_spoofing(int client_session_id, const char *disp, |
0b242b12 | 3074 | const char *proto, const char *data) |
8efc0c15 | 3075 | { |
1e3b8b07 | 3076 | u_int data_len = (u_int) strlen(data) / 2; |
ef07103c | 3077 | u_int i, value; |
5260325f | 3078 | char *new_data; |
3079 | int screen_number; | |
3080 | const char *cp; | |
ca75d7de | 3081 | u_int32_t rnd = 0; |
5260325f | 3082 | |
4297b666 | 3083 | if (x11_saved_display == NULL) |
3084 | x11_saved_display = xstrdup(disp); | |
3085 | else if (strcmp(disp, x11_saved_display) != 0) { | |
ef07103c | 3086 | error("x11_request_forwarding_with_spoofing: different " |
3087 | "$DISPLAY already forwarded"); | |
3088 | return; | |
3089 | } | |
3090 | ||
9bf083eb | 3091 | cp = disp; |
3092 | if (disp) | |
3093 | cp = strchr(disp, ':'); | |
5260325f | 3094 | if (cp) |
3095 | cp = strchr(cp, '.'); | |
3096 | if (cp) | |
d6d4897e | 3097 | screen_number = (u_int)strtonum(cp + 1, 0, 400, NULL); |
5260325f | 3098 | else |
3099 | screen_number = 0; | |
3100 | ||
ef07103c | 3101 | if (x11_saved_proto == NULL) { |
3102 | /* Save protocol name. */ | |
3103 | x11_saved_proto = xstrdup(proto); | |
3104 | /* | |
56964485 | 3105 | * Extract real authentication data and generate fake data |
ef07103c | 3106 | * of the same length. |
3107 | */ | |
3108 | x11_saved_data = xmalloc(data_len); | |
3109 | x11_fake_data = xmalloc(data_len); | |
3110 | for (i = 0; i < data_len; i++) { | |
3111 | if (sscanf(data + 2 * i, "%2x", &value) != 1) | |
3112 | fatal("x11_request_forwarding: bad " | |
3113 | "authentication data: %.100s", data); | |
3114 | if (i % 4 == 0) | |
3115 | rnd = arc4random(); | |
3116 | x11_saved_data[i] = value; | |
3117 | x11_fake_data[i] = rnd & 0xff; | |
3118 | rnd >>= 8; | |
3119 | } | |
3120 | x11_saved_data_len = data_len; | |
3121 | x11_fake_data_len = data_len; | |
3122 | } | |
5260325f | 3123 | |
3124 | /* Convert the fake data into hex. */ | |
ef07103c | 3125 | new_data = tohex(x11_fake_data, data_len); |
5260325f | 3126 | |
3127 | /* Send the request packet. */ | |
0b242b12 | 3128 | if (compat20) { |
3129 | channel_request_start(client_session_id, "x11-req", 0); | |
3130 | packet_put_char(0); /* XXX bool single connection */ | |
3131 | } else { | |
3132 | packet_start(SSH_CMSG_X11_REQUEST_FORWARDING); | |
3133 | } | |
3134 | packet_put_cstring(proto); | |
3135 | packet_put_cstring(new_data); | |
5260325f | 3136 | packet_put_int(screen_number); |
3137 | packet_send(); | |
3138 | packet_write_wait(); | |
3139 | xfree(new_data); | |
8efc0c15 | 3140 | } |
3141 | ||
8e7895b8 | 3142 | |
3143 | /* -- agent forwarding */ | |
3144 | ||
8efc0c15 | 3145 | /* Sends a message to the server to request authentication fd forwarding. */ |
3146 | ||
6ae2364d | 3147 | void |
d5bb9418 | 3148 | auth_request_forwarding(void) |
8efc0c15 | 3149 | { |
5260325f | 3150 | packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING); |
3151 | packet_send(); | |
3152 | packet_write_wait(); | |
8efc0c15 | 3153 | } |