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8efc0c15 | 1 | /* |
5260325f | 2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
5260325f | 3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
4 | * All rights reserved | |
5260325f | 5 | * This file contains functions for generic socket connection forwarding. |
6 | * There is also code for initiating connection forwarding for X11 connections, | |
7 | * arbitrary tcp/ip connections, and the authentication agent connection. | |
6ae2364d | 8 | * |
bcbf86ec | 9 | * As far as I am concerned, the code I have written for this software |
10 | * can be used freely for any purpose. Any derived versions of this | |
11 | * software must be clearly marked as such, and if the derived work is | |
12 | * incompatible with the protocol description in the RFC file, it must be | |
13 | * called by a name other than "ssh" or "Secure Shell". | |
14 | * | |
7e7327a1 | 15 | * SSH2 support added by Markus Friedl. |
8341f420 | 16 | * Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved. |
bcbf86ec | 17 | * Copyright (c) 1999 Dug Song. All rights reserved. |
18 | * Copyright (c) 1999 Theo de Raadt. All rights reserved. | |
19 | * | |
20 | * Redistribution and use in source and binary forms, with or without | |
21 | * modification, are permitted provided that the following conditions | |
22 | * are met: | |
23 | * 1. Redistributions of source code must retain the above copyright | |
24 | * notice, this list of conditions and the following disclaimer. | |
25 | * 2. Redistributions in binary form must reproduce the above copyright | |
26 | * notice, this list of conditions and the following disclaimer in the | |
27 | * documentation and/or other materials provided with the distribution. | |
28 | * | |
29 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
30 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
31 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
32 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
33 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
34 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
35 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
36 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
37 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
38 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
5260325f | 39 | */ |
8efc0c15 | 40 | |
41 | #include "includes.h" | |
fa1d7d85 | 42 | RCSID("$OpenBSD: channels.c,v 1.214 2005/03/14 11:46:56 markus Exp $"); |
8efc0c15 | 43 | |
44 | #include "ssh.h" | |
42f11eb2 | 45 | #include "ssh1.h" |
46 | #include "ssh2.h" | |
8efc0c15 | 47 | #include "packet.h" |
48 | #include "xmalloc.h" | |
42f11eb2 | 49 | #include "log.h" |
50 | #include "misc.h" | |
8efc0c15 | 51 | #include "channels.h" |
8efc0c15 | 52 | #include "compat.h" |
42f11eb2 | 53 | #include "canohost.h" |
4c8722d9 | 54 | #include "key.h" |
55 | #include "authfd.h" | |
805e659f | 56 | #include "pathnames.h" |
f49658f5 | 57 | #include "bufaux.h" |
8efc0c15 | 58 | |
8e7895b8 | 59 | /* -- channel core */ |
8efc0c15 | 60 | |
fa1d7d85 | 61 | #define CHAN_RBUF 16*1024 |
62 | ||
aa3378df | 63 | /* |
64 | * Pointer to an array containing all allocated channels. The array is | |
65 | * dynamically extended as needed. | |
66 | */ | |
719fc62f | 67 | static Channel **channels = NULL; |
8efc0c15 | 68 | |
aa3378df | 69 | /* |
70 | * Size of the channel array. All slots of the array must always be | |
719fc62f | 71 | * initialized (at least the type field); unused slots set to NULL |
aa3378df | 72 | */ |
9a995072 | 73 | static u_int channels_alloc = 0; |
8efc0c15 | 74 | |
aa3378df | 75 | /* |
76 | * Maximum file descriptor value used in any of the channels. This is | |
719fc62f | 77 | * updated in channel_new. |
aa3378df | 78 | */ |
39929cdb | 79 | static int channel_max_fd = 0; |
8efc0c15 | 80 | |
8efc0c15 | 81 | |
8e7895b8 | 82 | /* -- tcp forwarding */ |
8efc0c15 | 83 | |
aa3378df | 84 | /* |
85 | * Data structure for storing which hosts are permitted for forward requests. | |
86 | * The local sides of any remote forwards are stored in this array to prevent | |
87 | * a corrupt remote server from accessing arbitrary TCP/IP ports on our local | |
88 | * network (which might be behind a firewall). | |
89 | */ | |
5260325f | 90 | typedef struct { |
7368a6c8 | 91 | char *host_to_connect; /* Connect to 'host'. */ |
92 | u_short port_to_connect; /* Connect to 'port'. */ | |
93 | u_short listen_port; /* Remote side should listen port number. */ | |
8efc0c15 | 94 | } ForwardPermission; |
95 | ||
96 | /* List of all permitted host/port pairs to connect. */ | |
97 | static ForwardPermission permitted_opens[SSH_MAX_FORWARDS_PER_DIRECTION]; | |
8e7895b8 | 98 | |
8efc0c15 | 99 | /* Number of permitted host/port pairs in the array. */ |
100 | static int num_permitted_opens = 0; | |
aa3378df | 101 | /* |
102 | * If this is true, all opens are permitted. This is the case on the server | |
103 | * on which we have to trust the client anyway, and the user could do | |
104 | * anything after logging in anyway. | |
105 | */ | |
8efc0c15 | 106 | static int all_opens_permitted = 0; |
107 | ||
8efc0c15 | 108 | |
8e7895b8 | 109 | /* -- X11 forwarding */ |
42f11eb2 | 110 | |
8e7895b8 | 111 | /* Maximum number of fake X11 displays to try. */ |
112 | #define MAX_DISPLAYS 1000 | |
0490e609 | 113 | |
8e7895b8 | 114 | /* Saved X11 authentication protocol name. */ |
115 | static char *x11_saved_proto = NULL; | |
8efc0c15 | 116 | |
8e7895b8 | 117 | /* Saved X11 authentication data. This is the real data. */ |
118 | static char *x11_saved_data = NULL; | |
119 | static u_int x11_saved_data_len = 0; | |
120 | ||
121 | /* | |
122 | * Fake X11 authentication data. This is what the server will be sending us; | |
123 | * we should replace any occurrences of this by the real data. | |
124 | */ | |
125 | static char *x11_fake_data = NULL; | |
126 | static u_int x11_fake_data_len; | |
127 | ||
128 | ||
129 | /* -- agent forwarding */ | |
8efc0c15 | 130 | |
8e7895b8 | 131 | #define NUM_SOCKS 10 |
132 | ||
8e7895b8 | 133 | /* AF_UNSPEC or AF_INET or AF_INET6 */ |
5e4a7219 | 134 | static int IPv4or6 = AF_UNSPEC; |
8e7895b8 | 135 | |
136 | /* helper */ | |
396c147e | 137 | static void port_open_helper(Channel *c, char *rtype); |
8e7895b8 | 138 | |
139 | /* -- channel core */ | |
7368a6c8 | 140 | |
141 | Channel * | |
142 | channel_lookup(int id) | |
143 | { | |
144 | Channel *c; | |
719fc62f | 145 | |
9a995072 | 146 | if (id < 0 || (u_int)id >= channels_alloc) { |
bbe88b6d | 147 | logit("channel_lookup: %d: bad id", id); |
7368a6c8 | 148 | return NULL; |
149 | } | |
719fc62f | 150 | c = channels[id]; |
151 | if (c == NULL) { | |
bbe88b6d | 152 | logit("channel_lookup: %d: bad id: channel free", id); |
7368a6c8 | 153 | return NULL; |
154 | } | |
155 | return c; | |
156 | } | |
157 | ||
aa3378df | 158 | /* |
1d1ffb87 | 159 | * Register filedescriptors for a channel, used when allocating a channel or |
0fbe8c74 | 160 | * when the channel consumer/producer is ready, e.g. shell exec'd |
aa3378df | 161 | */ |
8efc0c15 | 162 | |
396c147e | 163 | static void |
a22aff1f | 164 | channel_register_fds(Channel *c, int rfd, int wfd, int efd, |
165 | int extusage, int nonblock) | |
8efc0c15 | 166 | { |
5260325f | 167 | /* Update the maximum file descriptor value. */ |
39929cdb | 168 | channel_max_fd = MAX(channel_max_fd, rfd); |
169 | channel_max_fd = MAX(channel_max_fd, wfd); | |
170 | channel_max_fd = MAX(channel_max_fd, efd); | |
171 | ||
aa3378df | 172 | /* XXX set close-on-exec -markus */ |
1d1ffb87 | 173 | |
0fbe8c74 | 174 | c->rfd = rfd; |
175 | c->wfd = wfd; | |
176 | c->sock = (rfd == wfd) ? rfd : -1; | |
5e96b616 | 177 | c->ctl_fd = -1; /* XXX: set elsewhere */ |
0fbe8c74 | 178 | c->efd = efd; |
179 | c->extended_usage = extusage; | |
a22aff1f | 180 | |
0ae4fe1d | 181 | /* XXX ugly hack: nonblock is only set by the server */ |
182 | if (nonblock && isatty(c->rfd)) { | |
d7ac5f18 | 183 | debug2("channel %d: rfd %d isatty", c->self, c->rfd); |
0ae4fe1d | 184 | c->isatty = 1; |
185 | if (!isatty(c->wfd)) { | |
94dfb550 | 186 | error("channel %d: wfd %d is not a tty?", |
0ae4fe1d | 187 | c->self, c->wfd); |
188 | } | |
189 | } else { | |
190 | c->isatty = 0; | |
191 | } | |
21c2c5cd | 192 | c->wfd_isatty = isatty(c->wfd); |
0ae4fe1d | 193 | |
a22aff1f | 194 | /* enable nonblocking mode */ |
195 | if (nonblock) { | |
196 | if (rfd != -1) | |
197 | set_nonblock(rfd); | |
198 | if (wfd != -1) | |
199 | set_nonblock(wfd); | |
200 | if (efd != -1) | |
201 | set_nonblock(efd); | |
202 | } | |
0fbe8c74 | 203 | } |
204 | ||
205 | /* | |
206 | * Allocate a new channel object and set its type and socket. This will cause | |
207 | * remote_name to be freed. | |
208 | */ | |
209 | ||
719fc62f | 210 | Channel * |
0fbe8c74 | 211 | channel_new(char *ctype, int type, int rfd, int wfd, int efd, |
f91d9a89 | 212 | u_int window, u_int maxpack, int extusage, char *remote_name, int nonblock) |
0fbe8c74 | 213 | { |
9a995072 | 214 | int found; |
215 | u_int i; | |
0fbe8c74 | 216 | Channel *c; |
5260325f | 217 | |
218 | /* Do initial allocation if this is the first call. */ | |
219 | if (channels_alloc == 0) { | |
220 | channels_alloc = 10; | |
719fc62f | 221 | channels = xmalloc(channels_alloc * sizeof(Channel *)); |
5260325f | 222 | for (i = 0; i < channels_alloc; i++) |
719fc62f | 223 | channels[i] = NULL; |
5260325f | 224 | } |
225 | /* Try to find a free slot where to put the new channel. */ | |
226 | for (found = -1, i = 0; i < channels_alloc; i++) | |
719fc62f | 227 | if (channels[i] == NULL) { |
5260325f | 228 | /* Found a free slot. */ |
9a995072 | 229 | found = (int)i; |
5260325f | 230 | break; |
231 | } | |
9a995072 | 232 | if (found < 0) { |
aa3378df | 233 | /* There are no free slots. Take last+1 slot and expand the array. */ |
5260325f | 234 | found = channels_alloc; |
5df8c731 | 235 | if (channels_alloc > 10000) |
236 | fatal("channel_new: internal error: channels_alloc %d " | |
237 | "too big.", channels_alloc); | |
20419cc1 | 238 | channels = xrealloc(channels, |
239 | (channels_alloc + 10) * sizeof(Channel *)); | |
240 | channels_alloc += 10; | |
de273eef | 241 | debug2("channel: expanding %d", channels_alloc); |
5260325f | 242 | for (i = found; i < channels_alloc; i++) |
719fc62f | 243 | channels[i] = NULL; |
5260325f | 244 | } |
719fc62f | 245 | /* Initialize and return new channel. */ |
246 | c = channels[found] = xmalloc(sizeof(Channel)); | |
639cb8ab | 247 | memset(c, 0, sizeof(Channel)); |
5260325f | 248 | buffer_init(&c->input); |
249 | buffer_init(&c->output); | |
7368a6c8 | 250 | buffer_init(&c->extended); |
70bef40e | 251 | c->ostate = CHAN_OUTPUT_OPEN; |
252 | c->istate = CHAN_INPUT_OPEN; | |
253 | c->flags = 0; | |
a22aff1f | 254 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock); |
5260325f | 255 | c->self = found; |
256 | c->type = type; | |
7368a6c8 | 257 | c->ctype = ctype; |
0b242b12 | 258 | c->local_window = window; |
259 | c->local_window_max = window; | |
260 | c->local_consumed = 0; | |
261 | c->local_maxpacket = maxpack; | |
5260325f | 262 | c->remote_id = -1; |
0d942eff | 263 | c->remote_name = xstrdup(remote_name); |
7368a6c8 | 264 | c->remote_window = 0; |
265 | c->remote_maxpacket = 0; | |
a5f82435 | 266 | c->force_drain = 0; |
ac151b18 | 267 | c->single_connection = 0; |
3cf2be58 | 268 | c->detach_user = NULL; |
05ca0898 | 269 | c->confirm = NULL; |
5e96b616 | 270 | c->confirm_ctx = NULL; |
2e73a022 | 271 | c->input_filter = NULL; |
5260325f | 272 | debug("channel %d: new [%s]", found, remote_name); |
719fc62f | 273 | return c; |
7368a6c8 | 274 | } |
8efc0c15 | 275 | |
489aa2e9 | 276 | static int |
277 | channel_find_maxfd(void) | |
278 | { | |
9a995072 | 279 | u_int i; |
280 | int max = 0; | |
489aa2e9 | 281 | Channel *c; |
282 | ||
283 | for (i = 0; i < channels_alloc; i++) { | |
284 | c = channels[i]; | |
285 | if (c != NULL) { | |
286 | max = MAX(max, c->rfd); | |
287 | max = MAX(max, c->wfd); | |
288 | max = MAX(max, c->efd); | |
289 | } | |
290 | } | |
291 | return max; | |
292 | } | |
293 | ||
294 | int | |
295 | channel_close_fd(int *fdp) | |
296 | { | |
297 | int ret = 0, fd = *fdp; | |
298 | ||
299 | if (fd != -1) { | |
300 | ret = close(fd); | |
301 | *fdp = -1; | |
302 | if (fd == channel_max_fd) | |
303 | channel_max_fd = channel_find_maxfd(); | |
304 | } | |
305 | return ret; | |
306 | } | |
307 | ||
0fbe8c74 | 308 | /* Close all channel fd/socket. */ |
309 | ||
396c147e | 310 | static void |
0fbe8c74 | 311 | channel_close_fds(Channel *c) |
312 | { | |
5e96b616 | 313 | debug3("channel %d: close_fds r %d w %d e %d c %d", |
314 | c->self, c->rfd, c->wfd, c->efd, c->ctl_fd); | |
6fd8622b | 315 | |
489aa2e9 | 316 | channel_close_fd(&c->sock); |
5e96b616 | 317 | channel_close_fd(&c->ctl_fd); |
489aa2e9 | 318 | channel_close_fd(&c->rfd); |
319 | channel_close_fd(&c->wfd); | |
320 | channel_close_fd(&c->efd); | |
0fbe8c74 | 321 | } |
322 | ||
8e7895b8 | 323 | /* Free the channel and close its fd/socket. */ |
324 | ||
325 | void | |
326 | channel_free(Channel *c) | |
327 | { | |
328 | char *s; | |
9a995072 | 329 | u_int i, n; |
8e7895b8 | 330 | |
331 | for (n = 0, i = 0; i < channels_alloc; i++) | |
332 | if (channels[i]) | |
333 | n++; | |
9a995072 | 334 | debug("channel %d: free: %s, nchannels %u", c->self, |
8e7895b8 | 335 | c->remote_name ? c->remote_name : "???", n); |
336 | ||
337 | s = channel_open_message(); | |
d7ac5f18 | 338 | debug3("channel %d: status: %s", c->self, s); |
8e7895b8 | 339 | xfree(s); |
340 | ||
8e7895b8 | 341 | if (c->sock != -1) |
342 | shutdown(c->sock, SHUT_RDWR); | |
5e96b616 | 343 | if (c->ctl_fd != -1) |
344 | shutdown(c->ctl_fd, SHUT_RDWR); | |
8e7895b8 | 345 | channel_close_fds(c); |
346 | buffer_free(&c->input); | |
347 | buffer_free(&c->output); | |
348 | buffer_free(&c->extended); | |
349 | if (c->remote_name) { | |
350 | xfree(c->remote_name); | |
351 | c->remote_name = NULL; | |
352 | } | |
353 | channels[c->self] = NULL; | |
354 | xfree(c); | |
355 | } | |
356 | ||
8e7895b8 | 357 | void |
d6746a0b | 358 | channel_free_all(void) |
8e7895b8 | 359 | { |
9a995072 | 360 | u_int i; |
8e7895b8 | 361 | |
d6746a0b | 362 | for (i = 0; i < channels_alloc; i++) |
363 | if (channels[i] != NULL) | |
364 | channel_free(channels[i]); | |
8e7895b8 | 365 | } |
366 | ||
367 | /* | |
368 | * Closes the sockets/fds of all channels. This is used to close extra file | |
369 | * descriptors after a fork. | |
370 | */ | |
371 | ||
372 | void | |
d5bb9418 | 373 | channel_close_all(void) |
8e7895b8 | 374 | { |
9a995072 | 375 | u_int i; |
8e7895b8 | 376 | |
377 | for (i = 0; i < channels_alloc; i++) | |
378 | if (channels[i] != NULL) | |
379 | channel_close_fds(channels[i]); | |
380 | } | |
381 | ||
3cf2be58 | 382 | /* |
383 | * Stop listening to channels. | |
384 | */ | |
385 | ||
386 | void | |
387 | channel_stop_listening(void) | |
388 | { | |
9a995072 | 389 | u_int i; |
3cf2be58 | 390 | Channel *c; |
391 | ||
392 | for (i = 0; i < channels_alloc; i++) { | |
393 | c = channels[i]; | |
394 | if (c != NULL) { | |
395 | switch (c->type) { | |
396 | case SSH_CHANNEL_AUTH_SOCKET: | |
397 | case SSH_CHANNEL_PORT_LISTENER: | |
398 | case SSH_CHANNEL_RPORT_LISTENER: | |
399 | case SSH_CHANNEL_X11_LISTENER: | |
489aa2e9 | 400 | channel_close_fd(&c->sock); |
3cf2be58 | 401 | channel_free(c); |
402 | break; | |
403 | } | |
404 | } | |
405 | } | |
406 | } | |
407 | ||
8e7895b8 | 408 | /* |
409 | * Returns true if no channel has too much buffered data, and false if one or | |
410 | * more channel is overfull. | |
411 | */ | |
412 | ||
413 | int | |
d5bb9418 | 414 | channel_not_very_much_buffered_data(void) |
8e7895b8 | 415 | { |
416 | u_int i; | |
417 | Channel *c; | |
418 | ||
419 | for (i = 0; i < channels_alloc; i++) { | |
420 | c = channels[i]; | |
421 | if (c != NULL && c->type == SSH_CHANNEL_OPEN) { | |
0c139bd1 | 422 | #if 0 |
423 | if (!compat20 && | |
424 | buffer_len(&c->input) > packet_get_maxsize()) { | |
faa483fa | 425 | debug2("channel %d: big input buffer %d", |
8e7895b8 | 426 | c->self, buffer_len(&c->input)); |
427 | return 0; | |
428 | } | |
0c139bd1 | 429 | #endif |
8e7895b8 | 430 | if (buffer_len(&c->output) > packet_get_maxsize()) { |
a27002e5 | 431 | debug2("channel %d: big output buffer %u > %u", |
0c139bd1 | 432 | c->self, buffer_len(&c->output), |
433 | packet_get_maxsize()); | |
8e7895b8 | 434 | return 0; |
435 | } | |
436 | } | |
437 | } | |
438 | return 1; | |
439 | } | |
440 | ||
441 | /* Returns true if any channel is still open. */ | |
442 | ||
443 | int | |
d5bb9418 | 444 | channel_still_open(void) |
8e7895b8 | 445 | { |
9a995072 | 446 | u_int i; |
8e7895b8 | 447 | Channel *c; |
448 | ||
449 | for (i = 0; i < channels_alloc; i++) { | |
450 | c = channels[i]; | |
451 | if (c == NULL) | |
452 | continue; | |
453 | switch (c->type) { | |
454 | case SSH_CHANNEL_X11_LISTENER: | |
455 | case SSH_CHANNEL_PORT_LISTENER: | |
456 | case SSH_CHANNEL_RPORT_LISTENER: | |
457 | case SSH_CHANNEL_CLOSED: | |
458 | case SSH_CHANNEL_AUTH_SOCKET: | |
459 | case SSH_CHANNEL_DYNAMIC: | |
460 | case SSH_CHANNEL_CONNECTING: | |
461 | case SSH_CHANNEL_ZOMBIE: | |
462 | continue; | |
463 | case SSH_CHANNEL_LARVAL: | |
464 | if (!compat20) | |
465 | fatal("cannot happen: SSH_CHANNEL_LARVAL"); | |
466 | continue; | |
467 | case SSH_CHANNEL_OPENING: | |
468 | case SSH_CHANNEL_OPEN: | |
469 | case SSH_CHANNEL_X11_OPEN: | |
470 | return 1; | |
471 | case SSH_CHANNEL_INPUT_DRAINING: | |
472 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
473 | if (!compat13) | |
474 | fatal("cannot happen: OUT_DRAIN"); | |
475 | return 1; | |
476 | default: | |
477 | fatal("channel_still_open: bad channel type %d", c->type); | |
478 | /* NOTREACHED */ | |
479 | } | |
480 | } | |
481 | return 0; | |
482 | } | |
483 | ||
484 | /* Returns the id of an open channel suitable for keepaliving */ | |
485 | ||
486 | int | |
d5bb9418 | 487 | channel_find_open(void) |
8e7895b8 | 488 | { |
9a995072 | 489 | u_int i; |
8e7895b8 | 490 | Channel *c; |
491 | ||
492 | for (i = 0; i < channels_alloc; i++) { | |
493 | c = channels[i]; | |
13de3560 | 494 | if (c == NULL || c->remote_id < 0) |
8e7895b8 | 495 | continue; |
496 | switch (c->type) { | |
497 | case SSH_CHANNEL_CLOSED: | |
498 | case SSH_CHANNEL_DYNAMIC: | |
499 | case SSH_CHANNEL_X11_LISTENER: | |
500 | case SSH_CHANNEL_PORT_LISTENER: | |
501 | case SSH_CHANNEL_RPORT_LISTENER: | |
502 | case SSH_CHANNEL_OPENING: | |
503 | case SSH_CHANNEL_CONNECTING: | |
504 | case SSH_CHANNEL_ZOMBIE: | |
505 | continue; | |
506 | case SSH_CHANNEL_LARVAL: | |
507 | case SSH_CHANNEL_AUTH_SOCKET: | |
508 | case SSH_CHANNEL_OPEN: | |
509 | case SSH_CHANNEL_X11_OPEN: | |
510 | return i; | |
511 | case SSH_CHANNEL_INPUT_DRAINING: | |
512 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
513 | if (!compat13) | |
514 | fatal("cannot happen: OUT_DRAIN"); | |
515 | return i; | |
516 | default: | |
517 | fatal("channel_find_open: bad channel type %d", c->type); | |
518 | /* NOTREACHED */ | |
519 | } | |
520 | } | |
521 | return -1; | |
522 | } | |
523 | ||
524 | ||
525 | /* | |
526 | * Returns a message describing the currently open forwarded connections, | |
527 | * suitable for sending to the client. The message contains crlf pairs for | |
528 | * newlines. | |
529 | */ | |
530 | ||
531 | char * | |
d5bb9418 | 532 | channel_open_message(void) |
8e7895b8 | 533 | { |
534 | Buffer buffer; | |
535 | Channel *c; | |
536 | char buf[1024], *cp; | |
9a995072 | 537 | u_int i; |
8e7895b8 | 538 | |
539 | buffer_init(&buffer); | |
540 | snprintf(buf, sizeof buf, "The following connections are open:\r\n"); | |
541 | buffer_append(&buffer, buf, strlen(buf)); | |
542 | for (i = 0; i < channels_alloc; i++) { | |
543 | c = channels[i]; | |
544 | if (c == NULL) | |
545 | continue; | |
546 | switch (c->type) { | |
547 | case SSH_CHANNEL_X11_LISTENER: | |
548 | case SSH_CHANNEL_PORT_LISTENER: | |
549 | case SSH_CHANNEL_RPORT_LISTENER: | |
550 | case SSH_CHANNEL_CLOSED: | |
551 | case SSH_CHANNEL_AUTH_SOCKET: | |
552 | case SSH_CHANNEL_ZOMBIE: | |
553 | continue; | |
554 | case SSH_CHANNEL_LARVAL: | |
555 | case SSH_CHANNEL_OPENING: | |
556 | case SSH_CHANNEL_CONNECTING: | |
557 | case SSH_CHANNEL_DYNAMIC: | |
558 | case SSH_CHANNEL_OPEN: | |
559 | case SSH_CHANNEL_X11_OPEN: | |
560 | case SSH_CHANNEL_INPUT_DRAINING: | |
561 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
5e96b616 | 562 | snprintf(buf, sizeof buf, |
563 | " #%d %.300s (t%d r%d i%d/%d o%d/%d fd %d/%d cfd %d)\r\n", | |
8e7895b8 | 564 | c->self, c->remote_name, |
565 | c->type, c->remote_id, | |
566 | c->istate, buffer_len(&c->input), | |
567 | c->ostate, buffer_len(&c->output), | |
5e96b616 | 568 | c->rfd, c->wfd, c->ctl_fd); |
8e7895b8 | 569 | buffer_append(&buffer, buf, strlen(buf)); |
570 | continue; | |
571 | default: | |
572 | fatal("channel_open_message: bad channel type %d", c->type); | |
573 | /* NOTREACHED */ | |
574 | } | |
575 | } | |
576 | buffer_append(&buffer, "\0", 1); | |
577 | cp = xstrdup(buffer_ptr(&buffer)); | |
578 | buffer_free(&buffer); | |
579 | return cp; | |
580 | } | |
581 | ||
582 | void | |
583 | channel_send_open(int id) | |
584 | { | |
585 | Channel *c = channel_lookup(id); | |
e1feb9bf | 586 | |
8e7895b8 | 587 | if (c == NULL) { |
bbe88b6d | 588 | logit("channel_send_open: %d: bad id", id); |
8e7895b8 | 589 | return; |
590 | } | |
6226a8f8 | 591 | debug2("channel %d: send open", id); |
8e7895b8 | 592 | packet_start(SSH2_MSG_CHANNEL_OPEN); |
593 | packet_put_cstring(c->ctype); | |
594 | packet_put_int(c->self); | |
595 | packet_put_int(c->local_window); | |
596 | packet_put_int(c->local_maxpacket); | |
597 | packet_send(); | |
598 | } | |
599 | ||
600 | void | |
6226a8f8 | 601 | channel_request_start(int id, char *service, int wantconfirm) |
8e7895b8 | 602 | { |
6226a8f8 | 603 | Channel *c = channel_lookup(id); |
e1feb9bf | 604 | |
8e7895b8 | 605 | if (c == NULL) { |
bbe88b6d | 606 | logit("channel_request_start: %d: unknown channel id", id); |
8e7895b8 | 607 | return; |
608 | } | |
5e96b616 | 609 | debug2("channel %d: request %s confirm %d", id, service, wantconfirm); |
8e7895b8 | 610 | packet_start(SSH2_MSG_CHANNEL_REQUEST); |
611 | packet_put_int(c->remote_id); | |
612 | packet_put_cstring(service); | |
613 | packet_put_char(wantconfirm); | |
614 | } | |
615 | void | |
5e96b616 | 616 | channel_register_confirm(int id, channel_callback_fn *fn, void *ctx) |
8e7895b8 | 617 | { |
618 | Channel *c = channel_lookup(id); | |
e1feb9bf | 619 | |
8e7895b8 | 620 | if (c == NULL) { |
bbe88b6d | 621 | logit("channel_register_comfirm: %d: bad id", id); |
8e7895b8 | 622 | return; |
623 | } | |
05ca0898 | 624 | c->confirm = fn; |
5e96b616 | 625 | c->confirm_ctx = ctx; |
8e7895b8 | 626 | } |
627 | void | |
628 | channel_register_cleanup(int id, channel_callback_fn *fn) | |
629 | { | |
630 | Channel *c = channel_lookup(id); | |
e1feb9bf | 631 | |
8e7895b8 | 632 | if (c == NULL) { |
bbe88b6d | 633 | logit("channel_register_cleanup: %d: bad id", id); |
8e7895b8 | 634 | return; |
635 | } | |
3cf2be58 | 636 | c->detach_user = fn; |
8e7895b8 | 637 | } |
638 | void | |
639 | channel_cancel_cleanup(int id) | |
640 | { | |
641 | Channel *c = channel_lookup(id); | |
e1feb9bf | 642 | |
8e7895b8 | 643 | if (c == NULL) { |
bbe88b6d | 644 | logit("channel_cancel_cleanup: %d: bad id", id); |
8e7895b8 | 645 | return; |
646 | } | |
3cf2be58 | 647 | c->detach_user = NULL; |
8e7895b8 | 648 | } |
649 | void | |
650 | channel_register_filter(int id, channel_filter_fn *fn) | |
651 | { | |
652 | Channel *c = channel_lookup(id); | |
e1feb9bf | 653 | |
8e7895b8 | 654 | if (c == NULL) { |
bbe88b6d | 655 | logit("channel_register_filter: %d: bad id", id); |
8e7895b8 | 656 | return; |
657 | } | |
658 | c->input_filter = fn; | |
659 | } | |
660 | ||
6ae2364d | 661 | void |
8e7895b8 | 662 | channel_set_fds(int id, int rfd, int wfd, int efd, |
399d1ea6 | 663 | int extusage, int nonblock, u_int window_max) |
8efc0c15 | 664 | { |
8e7895b8 | 665 | Channel *c = channel_lookup(id); |
e1feb9bf | 666 | |
8e7895b8 | 667 | if (c == NULL || c->type != SSH_CHANNEL_LARVAL) |
668 | fatal("channel_activate for non-larval channel %d.", id); | |
669 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock); | |
670 | c->type = SSH_CHANNEL_OPEN; | |
399d1ea6 | 671 | c->local_window = c->local_window_max = window_max; |
8e7895b8 | 672 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
673 | packet_put_int(c->remote_id); | |
674 | packet_put_int(c->local_window); | |
675 | packet_send(); | |
8efc0c15 | 676 | } |
677 | ||
aa3378df | 678 | /* |
7368a6c8 | 679 | * 'channel_pre*' are called just before select() to add any bits relevant to |
680 | * channels in the select bitmasks. | |
aa3378df | 681 | */ |
7368a6c8 | 682 | /* |
683 | * 'channel_post*': perform any appropriate operations for channels which | |
684 | * have events pending. | |
685 | */ | |
686 | typedef void chan_fn(Channel *c, fd_set * readset, fd_set * writeset); | |
687 | chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE]; | |
688 | chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE]; | |
8efc0c15 | 689 | |
396c147e | 690 | static void |
7368a6c8 | 691 | channel_pre_listener(Channel *c, fd_set * readset, fd_set * writeset) |
8efc0c15 | 692 | { |
7368a6c8 | 693 | FD_SET(c->sock, readset); |
694 | } | |
5260325f | 695 | |
396c147e | 696 | static void |
97fb6912 | 697 | channel_pre_connecting(Channel *c, fd_set * readset, fd_set * writeset) |
698 | { | |
699 | debug3("channel %d: waiting for connection", c->self); | |
700 | FD_SET(c->sock, writeset); | |
701 | } | |
702 | ||
396c147e | 703 | static void |
7368a6c8 | 704 | channel_pre_open_13(Channel *c, fd_set * readset, fd_set * writeset) |
705 | { | |
706 | if (buffer_len(&c->input) < packet_get_maxsize()) | |
707 | FD_SET(c->sock, readset); | |
708 | if (buffer_len(&c->output) > 0) | |
709 | FD_SET(c->sock, writeset); | |
710 | } | |
5260325f | 711 | |
396c147e | 712 | static void |
0c0738d5 | 713 | channel_pre_open(Channel *c, fd_set * readset, fd_set * writeset) |
7368a6c8 | 714 | { |
0c0738d5 | 715 | u_int limit = compat20 ? c->remote_window : packet_get_maxsize(); |
5260325f | 716 | |
fa1d7d85 | 717 | /* check buffer limits */ |
718 | limit = MIN(limit, (BUFFER_MAX_LEN - BUFFER_MAX_CHUNK - CHAN_RBUF)); | |
719 | ||
7e7327a1 | 720 | if (c->istate == CHAN_INPUT_OPEN && |
0c0738d5 | 721 | limit > 0 && |
722 | buffer_len(&c->input) < limit) | |
7e7327a1 | 723 | FD_SET(c->rfd, readset); |
724 | if (c->ostate == CHAN_OUTPUT_OPEN || | |
725 | c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { | |
726 | if (buffer_len(&c->output) > 0) { | |
727 | FD_SET(c->wfd, writeset); | |
728 | } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { | |
d2296ed7 | 729 | if (CHANNEL_EFD_OUTPUT_ACTIVE(c)) |
875ec275 | 730 | debug2("channel %d: obuf_empty delayed efd %d/(%d)", |
731 | c->self, c->efd, buffer_len(&c->extended)); | |
d2296ed7 | 732 | else |
733 | chan_obuf_empty(c); | |
7e7327a1 | 734 | } |
735 | } | |
736 | /** XXX check close conditions, too */ | |
0c0738d5 | 737 | if (compat20 && c->efd != -1) { |
7e7327a1 | 738 | if (c->extended_usage == CHAN_EXTENDED_WRITE && |
739 | buffer_len(&c->extended) > 0) | |
740 | FD_SET(c->efd, writeset); | |
d2296ed7 | 741 | else if (!(c->flags & CHAN_EOF_SENT) && |
742 | c->extended_usage == CHAN_EXTENDED_READ && | |
7e7327a1 | 743 | buffer_len(&c->extended) < c->remote_window) |
744 | FD_SET(c->efd, readset); | |
745 | } | |
5e96b616 | 746 | /* XXX: What about efd? races? */ |
f2107e97 | 747 | if (compat20 && c->ctl_fd != -1 && |
5e96b616 | 748 | c->istate == CHAN_INPUT_OPEN && c->ostate == CHAN_OUTPUT_OPEN) |
749 | FD_SET(c->ctl_fd, readset); | |
7e7327a1 | 750 | } |
751 | ||
396c147e | 752 | static void |
7368a6c8 | 753 | channel_pre_input_draining(Channel *c, fd_set * readset, fd_set * writeset) |
754 | { | |
755 | if (buffer_len(&c->input) == 0) { | |
756 | packet_start(SSH_MSG_CHANNEL_CLOSE); | |
757 | packet_put_int(c->remote_id); | |
758 | packet_send(); | |
759 | c->type = SSH_CHANNEL_CLOSED; | |
d7ac5f18 | 760 | debug2("channel %d: closing after input drain.", c->self); |
7368a6c8 | 761 | } |
762 | } | |
5260325f | 763 | |
396c147e | 764 | static void |
7368a6c8 | 765 | channel_pre_output_draining(Channel *c, fd_set * readset, fd_set * writeset) |
766 | { | |
767 | if (buffer_len(&c->output) == 0) | |
719fc62f | 768 | chan_mark_dead(c); |
6ae2364d | 769 | else |
7368a6c8 | 770 | FD_SET(c->sock, writeset); |
771 | } | |
5260325f | 772 | |
7368a6c8 | 773 | /* |
774 | * This is a special state for X11 authentication spoofing. An opened X11 | |
775 | * connection (when authentication spoofing is being done) remains in this | |
776 | * state until the first packet has been completely read. The authentication | |
777 | * data in that packet is then substituted by the real data if it matches the | |
778 | * fake data, and the channel is put into normal mode. | |
0b242b12 | 779 | * XXX All this happens at the client side. |
8e7895b8 | 780 | * Returns: 0 = need more data, -1 = wrong cookie, 1 = ok |
7368a6c8 | 781 | */ |
396c147e | 782 | static int |
8e7895b8 | 783 | x11_open_helper(Buffer *b) |
7368a6c8 | 784 | { |
1e3b8b07 | 785 | u_char *ucp; |
786 | u_int proto_len, data_len; | |
5260325f | 787 | |
7368a6c8 | 788 | /* Check if the fixed size part of the packet is in buffer. */ |
8e7895b8 | 789 | if (buffer_len(b) < 12) |
7368a6c8 | 790 | return 0; |
791 | ||
792 | /* Parse the lengths of variable-length fields. */ | |
20905a8e | 793 | ucp = buffer_ptr(b); |
7368a6c8 | 794 | if (ucp[0] == 0x42) { /* Byte order MSB first. */ |
795 | proto_len = 256 * ucp[6] + ucp[7]; | |
796 | data_len = 256 * ucp[8] + ucp[9]; | |
797 | } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */ | |
798 | proto_len = ucp[6] + 256 * ucp[7]; | |
799 | data_len = ucp[8] + 256 * ucp[9]; | |
800 | } else { | |
d7ac5f18 | 801 | debug2("Initial X11 packet contains bad byte order byte: 0x%x", |
184eed6a | 802 | ucp[0]); |
7368a6c8 | 803 | return -1; |
804 | } | |
5260325f | 805 | |
7368a6c8 | 806 | /* Check if the whole packet is in buffer. */ |
8e7895b8 | 807 | if (buffer_len(b) < |
7368a6c8 | 808 | 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3)) |
809 | return 0; | |
5260325f | 810 | |
7368a6c8 | 811 | /* Check if authentication protocol matches. */ |
812 | if (proto_len != strlen(x11_saved_proto) || | |
813 | memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) { | |
d7ac5f18 | 814 | debug2("X11 connection uses different authentication protocol."); |
7368a6c8 | 815 | return -1; |
816 | } | |
817 | /* Check if authentication data matches our fake data. */ | |
818 | if (data_len != x11_fake_data_len || | |
819 | memcmp(ucp + 12 + ((proto_len + 3) & ~3), | |
820 | x11_fake_data, x11_fake_data_len) != 0) { | |
d7ac5f18 | 821 | debug2("X11 auth data does not match fake data."); |
7368a6c8 | 822 | return -1; |
823 | } | |
824 | /* Check fake data length */ | |
825 | if (x11_fake_data_len != x11_saved_data_len) { | |
826 | error("X11 fake_data_len %d != saved_data_len %d", | |
827 | x11_fake_data_len, x11_saved_data_len); | |
828 | return -1; | |
829 | } | |
830 | /* | |
831 | * Received authentication protocol and data match | |
832 | * our fake data. Substitute the fake data with real | |
833 | * data. | |
834 | */ | |
835 | memcpy(ucp + 12 + ((proto_len + 3) & ~3), | |
836 | x11_saved_data, x11_saved_data_len); | |
837 | return 1; | |
838 | } | |
5260325f | 839 | |
396c147e | 840 | static void |
7368a6c8 | 841 | channel_pre_x11_open_13(Channel *c, fd_set * readset, fd_set * writeset) |
842 | { | |
8e7895b8 | 843 | int ret = x11_open_helper(&c->output); |
e1feb9bf | 844 | |
7368a6c8 | 845 | if (ret == 1) { |
846 | /* Start normal processing for the channel. */ | |
847 | c->type = SSH_CHANNEL_OPEN; | |
a8be9f80 | 848 | channel_pre_open_13(c, readset, writeset); |
7368a6c8 | 849 | } else if (ret == -1) { |
850 | /* | |
851 | * We have received an X11 connection that has bad | |
852 | * authentication information. | |
853 | */ | |
bbe88b6d | 854 | logit("X11 connection rejected because of wrong authentication."); |
7368a6c8 | 855 | buffer_clear(&c->input); |
856 | buffer_clear(&c->output); | |
489aa2e9 | 857 | channel_close_fd(&c->sock); |
7368a6c8 | 858 | c->sock = -1; |
859 | c->type = SSH_CHANNEL_CLOSED; | |
860 | packet_start(SSH_MSG_CHANNEL_CLOSE); | |
861 | packet_put_int(c->remote_id); | |
862 | packet_send(); | |
863 | } | |
864 | } | |
5260325f | 865 | |
396c147e | 866 | static void |
0b242b12 | 867 | channel_pre_x11_open(Channel *c, fd_set * readset, fd_set * writeset) |
7368a6c8 | 868 | { |
8e7895b8 | 869 | int ret = x11_open_helper(&c->output); |
a5f82435 | 870 | |
871 | /* c->force_drain = 1; */ | |
872 | ||
7368a6c8 | 873 | if (ret == 1) { |
874 | c->type = SSH_CHANNEL_OPEN; | |
0c0738d5 | 875 | channel_pre_open(c, readset, writeset); |
7368a6c8 | 876 | } else if (ret == -1) { |
bbe88b6d | 877 | logit("X11 connection rejected because of wrong authentication."); |
d7ac5f18 | 878 | debug2("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate); |
8341f420 | 879 | chan_read_failed(c); |
880 | buffer_clear(&c->input); | |
881 | chan_ibuf_empty(c); | |
882 | buffer_clear(&c->output); | |
883 | /* for proto v1, the peer will send an IEOF */ | |
884 | if (compat20) | |
885 | chan_write_failed(c); | |
886 | else | |
887 | c->type = SSH_CHANNEL_OPEN; | |
d7ac5f18 | 888 | debug2("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate); |
7368a6c8 | 889 | } |
890 | } | |
5260325f | 891 | |
28b9cb4d | 892 | /* try to decode a socks4 header */ |
396c147e | 893 | static int |
28b9cb4d | 894 | channel_decode_socks4(Channel *c, fd_set * readset, fd_set * writeset) |
0490e609 | 895 | { |
661e45a0 | 896 | char *p, *host; |
53b8fe68 | 897 | int len, have, i, found; |
184eed6a | 898 | char username[256]; |
0490e609 | 899 | struct { |
900 | u_int8_t version; | |
901 | u_int8_t command; | |
902 | u_int16_t dest_port; | |
28b9cb4d | 903 | struct in_addr dest_addr; |
0490e609 | 904 | } s4_req, s4_rsp; |
905 | ||
28b9cb4d | 906 | debug2("channel %d: decode socks4", c->self); |
53b8fe68 | 907 | |
908 | have = buffer_len(&c->input); | |
909 | len = sizeof(s4_req); | |
910 | if (have < len) | |
911 | return 0; | |
912 | p = buffer_ptr(&c->input); | |
913 | for (found = 0, i = len; i < have; i++) { | |
914 | if (p[i] == '\0') { | |
915 | found = 1; | |
916 | break; | |
917 | } | |
918 | if (i > 1024) { | |
919 | /* the peer is probably sending garbage */ | |
920 | debug("channel %d: decode socks4: too long", | |
921 | c->self); | |
922 | return -1; | |
923 | } | |
924 | } | |
925 | if (!found) | |
926 | return 0; | |
0490e609 | 927 | buffer_get(&c->input, (char *)&s4_req.version, 1); |
928 | buffer_get(&c->input, (char *)&s4_req.command, 1); | |
929 | buffer_get(&c->input, (char *)&s4_req.dest_port, 2); | |
28b9cb4d | 930 | buffer_get(&c->input, (char *)&s4_req.dest_addr, 4); |
53b8fe68 | 931 | have = buffer_len(&c->input); |
0490e609 | 932 | p = buffer_ptr(&c->input); |
933 | len = strlen(p); | |
6683b40f | 934 | debug2("channel %d: decode socks4: user %s/%d", c->self, p, len); |
0490e609 | 935 | if (len > have) |
28b9cb4d | 936 | fatal("channel %d: decode socks4: len %d > have %d", |
0490e609 | 937 | c->self, len, have); |
938 | strlcpy(username, p, sizeof(username)); | |
939 | buffer_consume(&c->input, len); | |
940 | buffer_consume(&c->input, 1); /* trailing '\0' */ | |
941 | ||
28b9cb4d | 942 | host = inet_ntoa(s4_req.dest_addr); |
0490e609 | 943 | strlcpy(c->path, host, sizeof(c->path)); |
944 | c->host_port = ntohs(s4_req.dest_port); | |
184eed6a | 945 | |
d7ac5f18 | 946 | debug2("channel %d: dynamic request: socks4 host %s port %u command %u", |
6683b40f | 947 | c->self, host, c->host_port, s4_req.command); |
0490e609 | 948 | |
28b9cb4d | 949 | if (s4_req.command != 1) { |
950 | debug("channel %d: cannot handle: socks4 cn %d", | |
951 | c->self, s4_req.command); | |
952 | return -1; | |
0490e609 | 953 | } |
28b9cb4d | 954 | s4_rsp.version = 0; /* vn: 0 for reply */ |
955 | s4_rsp.command = 90; /* cd: req granted */ | |
0490e609 | 956 | s4_rsp.dest_port = 0; /* ignored */ |
28b9cb4d | 957 | s4_rsp.dest_addr.s_addr = INADDR_ANY; /* ignored */ |
0490e609 | 958 | buffer_append(&c->output, (char *)&s4_rsp, sizeof(s4_rsp)); |
28b9cb4d | 959 | return 1; |
0490e609 | 960 | } |
961 | ||
f49658f5 | 962 | /* try to decode a socks5 header */ |
963 | #define SSH_SOCKS5_AUTHDONE 0x1000 | |
964 | #define SSH_SOCKS5_NOAUTH 0x00 | |
965 | #define SSH_SOCKS5_IPV4 0x01 | |
966 | #define SSH_SOCKS5_DOMAIN 0x03 | |
967 | #define SSH_SOCKS5_IPV6 0x04 | |
968 | #define SSH_SOCKS5_CONNECT 0x01 | |
969 | #define SSH_SOCKS5_SUCCESS 0x00 | |
970 | ||
971 | static int | |
972 | channel_decode_socks5(Channel *c, fd_set * readset, fd_set * writeset) | |
973 | { | |
974 | struct { | |
975 | u_int8_t version; | |
976 | u_int8_t command; | |
977 | u_int8_t reserved; | |
978 | u_int8_t atyp; | |
979 | } s5_req, s5_rsp; | |
980 | u_int16_t dest_port; | |
981 | u_char *p, dest_addr[255+1]; | |
982 | int i, have, found, nmethods, addrlen, af; | |
983 | ||
984 | debug2("channel %d: decode socks5", c->self); | |
985 | p = buffer_ptr(&c->input); | |
986 | if (p[0] != 0x05) | |
987 | return -1; | |
988 | have = buffer_len(&c->input); | |
989 | if (!(c->flags & SSH_SOCKS5_AUTHDONE)) { | |
990 | /* format: ver | nmethods | methods */ | |
aff51935 | 991 | if (have < 2) |
f49658f5 | 992 | return 0; |
993 | nmethods = p[1]; | |
994 | if (have < nmethods + 2) | |
995 | return 0; | |
996 | /* look for method: "NO AUTHENTICATION REQUIRED" */ | |
997 | for (found = 0, i = 2 ; i < nmethods + 2; i++) { | |
998 | if (p[i] == SSH_SOCKS5_NOAUTH ) { | |
999 | found = 1; | |
1000 | break; | |
1001 | } | |
1002 | } | |
1003 | if (!found) { | |
1004 | debug("channel %d: method SSH_SOCKS5_NOAUTH not found", | |
1005 | c->self); | |
1006 | return -1; | |
1007 | } | |
1008 | buffer_consume(&c->input, nmethods + 2); | |
1009 | buffer_put_char(&c->output, 0x05); /* version */ | |
1010 | buffer_put_char(&c->output, SSH_SOCKS5_NOAUTH); /* method */ | |
1011 | FD_SET(c->sock, writeset); | |
1012 | c->flags |= SSH_SOCKS5_AUTHDONE; | |
1013 | debug2("channel %d: socks5 auth done", c->self); | |
1014 | return 0; /* need more */ | |
1015 | } | |
1016 | debug2("channel %d: socks5 post auth", c->self); | |
1017 | if (have < sizeof(s5_req)+1) | |
1018 | return 0; /* need more */ | |
1019 | memcpy((char *)&s5_req, p, sizeof(s5_req)); | |
1020 | if (s5_req.version != 0x05 || | |
1021 | s5_req.command != SSH_SOCKS5_CONNECT || | |
1022 | s5_req.reserved != 0x00) { | |
d7ac5f18 | 1023 | debug2("channel %d: only socks5 connect supported", c->self); |
f49658f5 | 1024 | return -1; |
1025 | } | |
f8cc7664 | 1026 | switch (s5_req.atyp){ |
f49658f5 | 1027 | case SSH_SOCKS5_IPV4: |
1028 | addrlen = 4; | |
1029 | af = AF_INET; | |
1030 | break; | |
1031 | case SSH_SOCKS5_DOMAIN: | |
1032 | addrlen = p[sizeof(s5_req)]; | |
1033 | af = -1; | |
1034 | break; | |
1035 | case SSH_SOCKS5_IPV6: | |
1036 | addrlen = 16; | |
1037 | af = AF_INET6; | |
1038 | break; | |
1039 | default: | |
d7ac5f18 | 1040 | debug2("channel %d: bad socks5 atyp %d", c->self, s5_req.atyp); |
f49658f5 | 1041 | return -1; |
1042 | } | |
1043 | if (have < 4 + addrlen + 2) | |
1044 | return 0; | |
1045 | buffer_consume(&c->input, sizeof(s5_req)); | |
1046 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) | |
1047 | buffer_consume(&c->input, 1); /* host string length */ | |
1048 | buffer_get(&c->input, (char *)&dest_addr, addrlen); | |
1049 | buffer_get(&c->input, (char *)&dest_port, 2); | |
1050 | dest_addr[addrlen] = '\0'; | |
1051 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) | |
f6be21a0 | 1052 | strlcpy(c->path, (char *)dest_addr, sizeof(c->path)); |
f49658f5 | 1053 | else if (inet_ntop(af, dest_addr, c->path, sizeof(c->path)) == NULL) |
1054 | return -1; | |
1055 | c->host_port = ntohs(dest_port); | |
b6453d99 | 1056 | |
d7ac5f18 | 1057 | debug2("channel %d: dynamic request: socks5 host %s port %u command %u", |
f49658f5 | 1058 | c->self, c->path, c->host_port, s5_req.command); |
1059 | ||
1060 | s5_rsp.version = 0x05; | |
1061 | s5_rsp.command = SSH_SOCKS5_SUCCESS; | |
1062 | s5_rsp.reserved = 0; /* ignored */ | |
1063 | s5_rsp.atyp = SSH_SOCKS5_IPV4; | |
1064 | ((struct in_addr *)&dest_addr)->s_addr = INADDR_ANY; | |
1065 | dest_port = 0; /* ignored */ | |
1066 | ||
1067 | buffer_append(&c->output, (char *)&s5_rsp, sizeof(s5_rsp)); | |
1068 | buffer_append(&c->output, (char *)&dest_addr, sizeof(struct in_addr)); | |
1069 | buffer_append(&c->output, (char *)&dest_port, sizeof(dest_port)); | |
1070 | return 1; | |
1071 | } | |
1072 | ||
28b9cb4d | 1073 | /* dynamic port forwarding */ |
396c147e | 1074 | static void |
28b9cb4d | 1075 | channel_pre_dynamic(Channel *c, fd_set * readset, fd_set * writeset) |
1076 | { | |
1077 | u_char *p; | |
1078 | int have, ret; | |
1079 | ||
1080 | have = buffer_len(&c->input); | |
639cb8ab | 1081 | c->delayed = 0; |
28b9cb4d | 1082 | debug2("channel %d: pre_dynamic: have %d", c->self, have); |
070adba2 | 1083 | /* buffer_dump(&c->input); */ |
28b9cb4d | 1084 | /* check if the fixed size part of the packet is in buffer. */ |
f49658f5 | 1085 | if (have < 3) { |
28b9cb4d | 1086 | /* need more */ |
1087 | FD_SET(c->sock, readset); | |
1088 | return; | |
1089 | } | |
1090 | /* try to guess the protocol */ | |
1091 | p = buffer_ptr(&c->input); | |
1092 | switch (p[0]) { | |
6683b40f | 1093 | case 0x04: |
1094 | ret = channel_decode_socks4(c, readset, writeset); | |
1095 | break; | |
f49658f5 | 1096 | case 0x05: |
1097 | ret = channel_decode_socks5(c, readset, writeset); | |
1098 | break; | |
28b9cb4d | 1099 | default: |
1100 | ret = -1; | |
1101 | break; | |
1102 | } | |
1103 | if (ret < 0) { | |
719fc62f | 1104 | chan_mark_dead(c); |
28b9cb4d | 1105 | } else if (ret == 0) { |
1106 | debug2("channel %d: pre_dynamic: need more", c->self); | |
1107 | /* need more */ | |
1108 | FD_SET(c->sock, readset); | |
1109 | } else { | |
1110 | /* switch to the next state */ | |
1111 | c->type = SSH_CHANNEL_OPENING; | |
1112 | port_open_helper(c, "direct-tcpip"); | |
1113 | } | |
1114 | } | |
0490e609 | 1115 | |
7368a6c8 | 1116 | /* This is our fake X11 server socket. */ |
396c147e | 1117 | static void |
7368a6c8 | 1118 | channel_post_x11_listener(Channel *c, fd_set * readset, fd_set * writeset) |
1119 | { | |
719fc62f | 1120 | Channel *nc; |
7368a6c8 | 1121 | struct sockaddr addr; |
bcc0381e | 1122 | int newsock; |
7368a6c8 | 1123 | socklen_t addrlen; |
865ac82e | 1124 | char buf[16384], *remote_ipaddr; |
0b242b12 | 1125 | int remote_port; |
7368a6c8 | 1126 | |
1127 | if (FD_ISSET(c->sock, readset)) { | |
1128 | debug("X11 connection requested."); | |
1129 | addrlen = sizeof(addr); | |
1130 | newsock = accept(c->sock, &addr, &addrlen); | |
ac151b18 | 1131 | if (c->single_connection) { |
d7ac5f18 | 1132 | debug2("single_connection: closing X11 listener."); |
ac151b18 | 1133 | channel_close_fd(&c->sock); |
1134 | chan_mark_dead(c); | |
1135 | } | |
7368a6c8 | 1136 | if (newsock < 0) { |
1137 | error("accept: %.100s", strerror(errno)); | |
1138 | return; | |
5260325f | 1139 | } |
bcc0381e | 1140 | set_nodelay(newsock); |
865ac82e | 1141 | remote_ipaddr = get_peer_ipaddr(newsock); |
0b242b12 | 1142 | remote_port = get_peer_port(newsock); |
7368a6c8 | 1143 | snprintf(buf, sizeof buf, "X11 connection from %.200s port %d", |
865ac82e | 1144 | remote_ipaddr, remote_port); |
0b242b12 | 1145 | |
719fc62f | 1146 | nc = channel_new("accepted x11 socket", |
0b242b12 | 1147 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
0d942eff | 1148 | c->local_window_max, c->local_maxpacket, 0, buf, 1); |
0b242b12 | 1149 | if (compat20) { |
1150 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1151 | packet_put_cstring("x11"); | |
719fc62f | 1152 | packet_put_int(nc->self); |
ac151b18 | 1153 | packet_put_int(nc->local_window_max); |
1154 | packet_put_int(nc->local_maxpacket); | |
865ac82e | 1155 | /* originator ipaddr and port */ |
1156 | packet_put_cstring(remote_ipaddr); | |
d0c832f3 | 1157 | if (datafellows & SSH_BUG_X11FWD) { |
d7ac5f18 | 1158 | debug2("ssh2 x11 bug compat mode"); |
d0c832f3 | 1159 | } else { |
1160 | packet_put_int(remote_port); | |
1161 | } | |
0b242b12 | 1162 | packet_send(); |
1163 | } else { | |
1164 | packet_start(SSH_SMSG_X11_OPEN); | |
719fc62f | 1165 | packet_put_int(nc->self); |
8e7895b8 | 1166 | if (packet_get_protocol_flags() & |
1167 | SSH_PROTOFLAG_HOST_IN_FWD_OPEN) | |
449c5ba5 | 1168 | packet_put_cstring(buf); |
0b242b12 | 1169 | packet_send(); |
1170 | } | |
865ac82e | 1171 | xfree(remote_ipaddr); |
8efc0c15 | 1172 | } |
8efc0c15 | 1173 | } |
1174 | ||
396c147e | 1175 | static void |
0490e609 | 1176 | port_open_helper(Channel *c, char *rtype) |
1177 | { | |
1178 | int direct; | |
1179 | char buf[1024]; | |
1180 | char *remote_ipaddr = get_peer_ipaddr(c->sock); | |
1181 | u_short remote_port = get_peer_port(c->sock); | |
1182 | ||
1183 | direct = (strcmp(rtype, "direct-tcpip") == 0); | |
1184 | ||
1185 | snprintf(buf, sizeof buf, | |
1186 | "%s: listening port %d for %.100s port %d, " | |
1187 | "connect from %.200s port %d", | |
1188 | rtype, c->listening_port, c->path, c->host_port, | |
1189 | remote_ipaddr, remote_port); | |
1190 | ||
1191 | xfree(c->remote_name); | |
1192 | c->remote_name = xstrdup(buf); | |
1193 | ||
1194 | if (compat20) { | |
1195 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1196 | packet_put_cstring(rtype); | |
1197 | packet_put_int(c->self); | |
1198 | packet_put_int(c->local_window_max); | |
1199 | packet_put_int(c->local_maxpacket); | |
1200 | if (direct) { | |
1201 | /* target host, port */ | |
1202 | packet_put_cstring(c->path); | |
1203 | packet_put_int(c->host_port); | |
1204 | } else { | |
1205 | /* listen address, port */ | |
1206 | packet_put_cstring(c->path); | |
1207 | packet_put_int(c->listening_port); | |
1208 | } | |
1209 | /* originator host and port */ | |
1210 | packet_put_cstring(remote_ipaddr); | |
1211 | packet_put_int(remote_port); | |
1212 | packet_send(); | |
1213 | } else { | |
1214 | packet_start(SSH_MSG_PORT_OPEN); | |
1215 | packet_put_int(c->self); | |
1216 | packet_put_cstring(c->path); | |
1217 | packet_put_int(c->host_port); | |
8e7895b8 | 1218 | if (packet_get_protocol_flags() & |
1219 | SSH_PROTOFLAG_HOST_IN_FWD_OPEN) | |
0490e609 | 1220 | packet_put_cstring(c->remote_name); |
1221 | packet_send(); | |
1222 | } | |
1223 | xfree(remote_ipaddr); | |
1224 | } | |
1225 | ||
aa3378df | 1226 | /* |
7368a6c8 | 1227 | * This socket is listening for connections to a forwarded TCP/IP port. |
aa3378df | 1228 | */ |
396c147e | 1229 | static void |
7368a6c8 | 1230 | channel_post_port_listener(Channel *c, fd_set * readset, fd_set * writeset) |
1231 | { | |
0490e609 | 1232 | Channel *nc; |
7368a6c8 | 1233 | struct sockaddr addr; |
719fc62f | 1234 | int newsock, nextstate; |
7368a6c8 | 1235 | socklen_t addrlen; |
0490e609 | 1236 | char *rtype; |
fa08c86b | 1237 | |
7368a6c8 | 1238 | if (FD_ISSET(c->sock, readset)) { |
1239 | debug("Connection to port %d forwarding " | |
1240 | "to %.100s port %d requested.", | |
1241 | c->listening_port, c->path, c->host_port); | |
0490e609 | 1242 | |
639cb8ab | 1243 | if (c->type == SSH_CHANNEL_RPORT_LISTENER) { |
1244 | nextstate = SSH_CHANNEL_OPENING; | |
1245 | rtype = "forwarded-tcpip"; | |
1246 | } else { | |
1247 | if (c->host_port == 0) { | |
1248 | nextstate = SSH_CHANNEL_DYNAMIC; | |
f3964cb9 | 1249 | rtype = "dynamic-tcpip"; |
639cb8ab | 1250 | } else { |
1251 | nextstate = SSH_CHANNEL_OPENING; | |
1252 | rtype = "direct-tcpip"; | |
1253 | } | |
1254 | } | |
0490e609 | 1255 | |
7368a6c8 | 1256 | addrlen = sizeof(addr); |
1257 | newsock = accept(c->sock, &addr, &addrlen); | |
1258 | if (newsock < 0) { | |
1259 | error("accept: %.100s", strerror(errno)); | |
1260 | return; | |
1261 | } | |
811a6342 | 1262 | set_nodelay(newsock); |
0d942eff | 1263 | nc = channel_new(rtype, nextstate, newsock, newsock, -1, |
1264 | c->local_window_max, c->local_maxpacket, 0, rtype, 1); | |
0490e609 | 1265 | nc->listening_port = c->listening_port; |
1266 | nc->host_port = c->host_port; | |
1267 | strlcpy(nc->path, c->path, sizeof(nc->path)); | |
1268 | ||
639cb8ab | 1269 | if (nextstate == SSH_CHANNEL_DYNAMIC) { |
1270 | /* | |
1271 | * do not call the channel_post handler until | |
1272 | * this flag has been reset by a pre-handler. | |
1273 | * otherwise the FD_ISSET calls might overflow | |
1274 | */ | |
1275 | nc->delayed = 1; | |
1276 | } else { | |
0490e609 | 1277 | port_open_helper(nc, rtype); |
639cb8ab | 1278 | } |
7368a6c8 | 1279 | } |
1280 | } | |
8efc0c15 | 1281 | |
7368a6c8 | 1282 | /* |
1283 | * This is the authentication agent socket listening for connections from | |
1284 | * clients. | |
1285 | */ | |
396c147e | 1286 | static void |
7368a6c8 | 1287 | channel_post_auth_listener(Channel *c, fd_set * readset, fd_set * writeset) |
8efc0c15 | 1288 | { |
719fc62f | 1289 | Channel *nc; |
1290 | int newsock; | |
5260325f | 1291 | struct sockaddr addr; |
48e671d5 | 1292 | socklen_t addrlen; |
5260325f | 1293 | |
7368a6c8 | 1294 | if (FD_ISSET(c->sock, readset)) { |
1295 | addrlen = sizeof(addr); | |
1296 | newsock = accept(c->sock, &addr, &addrlen); | |
1297 | if (newsock < 0) { | |
1298 | error("accept from auth socket: %.100s", strerror(errno)); | |
1299 | return; | |
1300 | } | |
719fc62f | 1301 | nc = channel_new("accepted auth socket", |
fa08c86b | 1302 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
1303 | c->local_window_max, c->local_maxpacket, | |
0d942eff | 1304 | 0, "accepted auth socket", 1); |
fa08c86b | 1305 | if (compat20) { |
1306 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1307 | packet_put_cstring("auth-agent@openssh.com"); | |
719fc62f | 1308 | packet_put_int(nc->self); |
fa08c86b | 1309 | packet_put_int(c->local_window_max); |
1310 | packet_put_int(c->local_maxpacket); | |
1311 | } else { | |
1312 | packet_start(SSH_SMSG_AGENT_OPEN); | |
719fc62f | 1313 | packet_put_int(nc->self); |
fa08c86b | 1314 | } |
7368a6c8 | 1315 | packet_send(); |
1316 | } | |
1317 | } | |
5260325f | 1318 | |
396c147e | 1319 | static void |
97fb6912 | 1320 | channel_post_connecting(Channel *c, fd_set * readset, fd_set * writeset) |
1321 | { | |
d18e0850 | 1322 | int err = 0; |
8ab2cb35 | 1323 | socklen_t sz = sizeof(err); |
d18e0850 | 1324 | |
97fb6912 | 1325 | if (FD_ISSET(c->sock, writeset)) { |
db518d9b | 1326 | if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, &err, &sz) < 0) { |
d18e0850 | 1327 | err = errno; |
1328 | error("getsockopt SO_ERROR failed"); | |
1329 | } | |
1330 | if (err == 0) { | |
1331 | debug("channel %d: connected", c->self); | |
1332 | c->type = SSH_CHANNEL_OPEN; | |
1333 | if (compat20) { | |
1334 | packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1335 | packet_put_int(c->remote_id); | |
1336 | packet_put_int(c->self); | |
1337 | packet_put_int(c->local_window); | |
1338 | packet_put_int(c->local_maxpacket); | |
1339 | } else { | |
1340 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1341 | packet_put_int(c->remote_id); | |
1342 | packet_put_int(c->self); | |
1343 | } | |
97fb6912 | 1344 | } else { |
d18e0850 | 1345 | debug("channel %d: not connected: %s", |
1346 | c->self, strerror(err)); | |
1347 | if (compat20) { | |
1348 | packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); | |
1349 | packet_put_int(c->remote_id); | |
1350 | packet_put_int(SSH2_OPEN_CONNECT_FAILED); | |
1351 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { | |
1352 | packet_put_cstring(strerror(err)); | |
1353 | packet_put_cstring(""); | |
1354 | } | |
97fb6912 | 1355 | } else { |
d18e0850 | 1356 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
1357 | packet_put_int(c->remote_id); | |
97fb6912 | 1358 | } |
d18e0850 | 1359 | chan_mark_dead(c); |
97fb6912 | 1360 | } |
d18e0850 | 1361 | packet_send(); |
97fb6912 | 1362 | } |
1363 | } | |
1364 | ||
396c147e | 1365 | static int |
7368a6c8 | 1366 | channel_handle_rfd(Channel *c, fd_set * readset, fd_set * writeset) |
1367 | { | |
fa1d7d85 | 1368 | char buf[CHAN_RBUF]; |
7368a6c8 | 1369 | int len; |
1370 | ||
6fd8622b | 1371 | if (c->rfd != -1 && |
7368a6c8 | 1372 | FD_ISSET(c->rfd, readset)) { |
1373 | len = read(c->rfd, buf, sizeof(buf)); | |
0fbe8c74 | 1374 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
1375 | return 1; | |
7368a6c8 | 1376 | if (len <= 0) { |
d7ac5f18 | 1377 | debug2("channel %d: read<=0 rfd %d len %d", |
7368a6c8 | 1378 | c->self, c->rfd, len); |
28b9cb4d | 1379 | if (c->type != SSH_CHANNEL_OPEN) { |
d7ac5f18 | 1380 | debug2("channel %d: not open", c->self); |
719fc62f | 1381 | chan_mark_dead(c); |
0490e609 | 1382 | return -1; |
28b9cb4d | 1383 | } else if (compat13) { |
9c50edcf | 1384 | buffer_clear(&c->output); |
7368a6c8 | 1385 | c->type = SSH_CHANNEL_INPUT_DRAINING; |
d7ac5f18 | 1386 | debug2("channel %d: input draining.", c->self); |
7368a6c8 | 1387 | } else { |
1388 | chan_read_failed(c); | |
5260325f | 1389 | } |
7368a6c8 | 1390 | return -1; |
1391 | } | |
6aacefa7 | 1392 | if (c->input_filter != NULL) { |
2e73a022 | 1393 | if (c->input_filter(c, buf, len) == -1) { |
d7ac5f18 | 1394 | debug2("channel %d: filter stops", c->self); |
2e73a022 | 1395 | chan_read_failed(c); |
1396 | } | |
1397 | } else { | |
1398 | buffer_append(&c->input, buf, len); | |
1399 | } | |
7368a6c8 | 1400 | } |
1401 | return 1; | |
1402 | } | |
396c147e | 1403 | static int |
7368a6c8 | 1404 | channel_handle_wfd(Channel *c, fd_set * readset, fd_set * writeset) |
1405 | { | |
95ce5599 | 1406 | struct termios tio; |
780a9951 | 1407 | u_char *data; |
1408 | u_int dlen; | |
7368a6c8 | 1409 | int len; |
1410 | ||
1411 | /* Send buffered output data to the socket. */ | |
6fd8622b | 1412 | if (c->wfd != -1 && |
7368a6c8 | 1413 | FD_ISSET(c->wfd, writeset) && |
1414 | buffer_len(&c->output) > 0) { | |
780a9951 | 1415 | data = buffer_ptr(&c->output); |
1416 | dlen = buffer_len(&c->output); | |
64c0ce80 | 1417 | #ifdef _AIX |
aff51935 | 1418 | /* XXX: Later AIX versions can't push as much data to tty */ |
7fbb4189 | 1419 | if (compat20 && c->wfd_isatty) |
1420 | dlen = MIN(dlen, 8*1024); | |
64c0ce80 | 1421 | #endif |
21c2c5cd | 1422 | len = write(c->wfd, data, dlen); |
0fbe8c74 | 1423 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
1424 | return 1; | |
7368a6c8 | 1425 | if (len <= 0) { |
28b9cb4d | 1426 | if (c->type != SSH_CHANNEL_OPEN) { |
d7ac5f18 | 1427 | debug2("channel %d: not open", c->self); |
719fc62f | 1428 | chan_mark_dead(c); |
28b9cb4d | 1429 | return -1; |
1430 | } else if (compat13) { | |
9c50edcf | 1431 | buffer_clear(&c->output); |
d7ac5f18 | 1432 | debug2("channel %d: input draining.", c->self); |
7368a6c8 | 1433 | c->type = SSH_CHANNEL_INPUT_DRAINING; |
1434 | } else { | |
1435 | chan_write_failed(c); | |
5260325f | 1436 | } |
7368a6c8 | 1437 | return -1; |
1438 | } | |
780a9951 | 1439 | if (compat20 && c->isatty && dlen >= 1 && data[0] != '\r') { |
0ae4fe1d | 1440 | if (tcgetattr(c->wfd, &tio) == 0 && |
1441 | !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) { | |
1442 | /* | |
1443 | * Simulate echo to reduce the impact of | |
355724fc | 1444 | * traffic analysis. We need to match the |
95ce5599 | 1445 | * size of a SSH2_MSG_CHANNEL_DATA message |
1446 | * (4 byte channel id + data) | |
0ae4fe1d | 1447 | */ |
95ce5599 | 1448 | packet_send_ignore(4 + len); |
0ae4fe1d | 1449 | packet_send(); |
0ae4fe1d | 1450 | } |
1451 | } | |
7368a6c8 | 1452 | buffer_consume(&c->output, len); |
7e7327a1 | 1453 | if (compat20 && len > 0) { |
1454 | c->local_consumed += len; | |
1455 | } | |
1456 | } | |
1457 | return 1; | |
1458 | } | |
396c147e | 1459 | static int |
7e7327a1 | 1460 | channel_handle_efd(Channel *c, fd_set * readset, fd_set * writeset) |
1461 | { | |
fa1d7d85 | 1462 | char buf[CHAN_RBUF]; |
7e7327a1 | 1463 | int len; |
1464 | ||
8ce64345 | 1465 | /** XXX handle drain efd, too */ |
7e7327a1 | 1466 | if (c->efd != -1) { |
1467 | if (c->extended_usage == CHAN_EXTENDED_WRITE && | |
1468 | FD_ISSET(c->efd, writeset) && | |
1469 | buffer_len(&c->extended) > 0) { | |
1470 | len = write(c->efd, buffer_ptr(&c->extended), | |
1471 | buffer_len(&c->extended)); | |
de273eef | 1472 | debug2("channel %d: written %d to efd %d", |
7e7327a1 | 1473 | c->self, len, c->efd); |
ee55dacf | 1474 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
1475 | return 1; | |
1476 | if (len <= 0) { | |
1477 | debug2("channel %d: closing write-efd %d", | |
1478 | c->self, c->efd); | |
489aa2e9 | 1479 | channel_close_fd(&c->efd); |
ee55dacf | 1480 | } else { |
7e7327a1 | 1481 | buffer_consume(&c->extended, len); |
1482 | c->local_consumed += len; | |
1483 | } | |
1484 | } else if (c->extended_usage == CHAN_EXTENDED_READ && | |
1485 | FD_ISSET(c->efd, readset)) { | |
1486 | len = read(c->efd, buf, sizeof(buf)); | |
de273eef | 1487 | debug2("channel %d: read %d from efd %d", |
184eed6a | 1488 | c->self, len, c->efd); |
ee55dacf | 1489 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
1490 | return 1; | |
1491 | if (len <= 0) { | |
1492 | debug2("channel %d: closing read-efd %d", | |
8ce64345 | 1493 | c->self, c->efd); |
489aa2e9 | 1494 | channel_close_fd(&c->efd); |
ee55dacf | 1495 | } else { |
7e7327a1 | 1496 | buffer_append(&c->extended, buf, len); |
ee55dacf | 1497 | } |
7e7327a1 | 1498 | } |
1499 | } | |
1500 | return 1; | |
1501 | } | |
396c147e | 1502 | static int |
5e96b616 | 1503 | channel_handle_ctl(Channel *c, fd_set * readset, fd_set * writeset) |
1504 | { | |
1505 | char buf[16]; | |
1506 | int len; | |
1507 | ||
1508 | /* Monitor control fd to detect if the slave client exits */ | |
1509 | if (c->ctl_fd != -1 && FD_ISSET(c->ctl_fd, readset)) { | |
1510 | len = read(c->ctl_fd, buf, sizeof(buf)); | |
1511 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) | |
1512 | return 1; | |
1513 | if (len <= 0) { | |
1514 | debug2("channel %d: ctl read<=0", c->self); | |
1515 | if (c->type != SSH_CHANNEL_OPEN) { | |
1516 | debug2("channel %d: not open", c->self); | |
1517 | chan_mark_dead(c); | |
1518 | return -1; | |
1519 | } else { | |
1520 | chan_read_failed(c); | |
1521 | chan_write_failed(c); | |
1522 | } | |
1523 | return -1; | |
1524 | } else | |
1525 | fatal("%s: unexpected data on ctl fd", __func__); | |
1526 | } | |
1527 | return 1; | |
1528 | } | |
1529 | static int | |
ee55dacf | 1530 | channel_check_window(Channel *c) |
7e7327a1 | 1531 | { |
28b9cb4d | 1532 | if (c->type == SSH_CHANNEL_OPEN && |
1533 | !(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) && | |
7e7327a1 | 1534 | c->local_window < c->local_window_max/2 && |
1535 | c->local_consumed > 0) { | |
1536 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); | |
1537 | packet_put_int(c->remote_id); | |
1538 | packet_put_int(c->local_consumed); | |
1539 | packet_send(); | |
de273eef | 1540 | debug2("channel %d: window %d sent adjust %d", |
7e7327a1 | 1541 | c->self, c->local_window, |
1542 | c->local_consumed); | |
1543 | c->local_window += c->local_consumed; | |
1544 | c->local_consumed = 0; | |
7368a6c8 | 1545 | } |
1546 | return 1; | |
1547 | } | |
5260325f | 1548 | |
396c147e | 1549 | static void |
0c0738d5 | 1550 | channel_post_open(Channel *c, fd_set * readset, fd_set * writeset) |
7368a6c8 | 1551 | { |
639cb8ab | 1552 | if (c->delayed) |
1553 | return; | |
7368a6c8 | 1554 | channel_handle_rfd(c, readset, writeset); |
1555 | channel_handle_wfd(c, readset, writeset); | |
0c0738d5 | 1556 | if (!compat20) |
639cb8ab | 1557 | return; |
7e7327a1 | 1558 | channel_handle_efd(c, readset, writeset); |
5e96b616 | 1559 | channel_handle_ctl(c, readset, writeset); |
ee55dacf | 1560 | channel_check_window(c); |
7e7327a1 | 1561 | } |
1562 | ||
396c147e | 1563 | static void |
7368a6c8 | 1564 | channel_post_output_drain_13(Channel *c, fd_set * readset, fd_set * writeset) |
1565 | { | |
1566 | int len; | |
e1feb9bf | 1567 | |
7368a6c8 | 1568 | /* Send buffered output data to the socket. */ |
1569 | if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) { | |
1570 | len = write(c->sock, buffer_ptr(&c->output), | |
1571 | buffer_len(&c->output)); | |
1572 | if (len <= 0) | |
9c50edcf | 1573 | buffer_clear(&c->output); |
7368a6c8 | 1574 | else |
1575 | buffer_consume(&c->output, len); | |
1576 | } | |
1577 | } | |
5260325f | 1578 | |
396c147e | 1579 | static void |
7e7327a1 | 1580 | channel_handler_init_20(void) |
1581 | { | |
0c0738d5 | 1582 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open; |
0b242b12 | 1583 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
7e7327a1 | 1584 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; |
fa08c86b | 1585 | channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener; |
0b242b12 | 1586 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
fa08c86b | 1587 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; |
97fb6912 | 1588 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1589 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7e7327a1 | 1590 | |
0c0738d5 | 1591 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
7e7327a1 | 1592 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; |
fa08c86b | 1593 | channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener; |
0b242b12 | 1594 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
fa08c86b | 1595 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; |
97fb6912 | 1596 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 1597 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
7e7327a1 | 1598 | } |
1599 | ||
396c147e | 1600 | static void |
7368a6c8 | 1601 | channel_handler_init_13(void) |
1602 | { | |
1603 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13; | |
1604 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_13; | |
1605 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; | |
1606 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; | |
1607 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; | |
1608 | channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining; | |
1609 | channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining; | |
97fb6912 | 1610 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1611 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7368a6c8 | 1612 | |
0c0738d5 | 1613 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
7368a6c8 | 1614 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
1615 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; | |
1616 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; | |
1617 | channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13; | |
97fb6912 | 1618 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 1619 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
7368a6c8 | 1620 | } |
5260325f | 1621 | |
396c147e | 1622 | static void |
7368a6c8 | 1623 | channel_handler_init_15(void) |
1624 | { | |
0c0738d5 | 1625 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open; |
0b242b12 | 1626 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
7368a6c8 | 1627 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
1628 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; | |
1629 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; | |
97fb6912 | 1630 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1631 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7368a6c8 | 1632 | |
1633 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; | |
1634 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; | |
1635 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; | |
0c0738d5 | 1636 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
97fb6912 | 1637 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 1638 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
7368a6c8 | 1639 | } |
1640 | ||
396c147e | 1641 | static void |
7368a6c8 | 1642 | channel_handler_init(void) |
1643 | { | |
1644 | int i; | |
e1feb9bf | 1645 | |
184eed6a | 1646 | for (i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) { |
7368a6c8 | 1647 | channel_pre[i] = NULL; |
1648 | channel_post[i] = NULL; | |
1649 | } | |
7e7327a1 | 1650 | if (compat20) |
1651 | channel_handler_init_20(); | |
1652 | else if (compat13) | |
7368a6c8 | 1653 | channel_handler_init_13(); |
1654 | else | |
1655 | channel_handler_init_15(); | |
1656 | } | |
1657 | ||
418e724c | 1658 | /* gc dead channels */ |
1659 | static void | |
1660 | channel_garbage_collect(Channel *c) | |
1661 | { | |
1662 | if (c == NULL) | |
1663 | return; | |
1664 | if (c->detach_user != NULL) { | |
1665 | if (!chan_is_dead(c, 0)) | |
1666 | return; | |
d7ac5f18 | 1667 | debug2("channel %d: gc: notify user", c->self); |
418e724c | 1668 | c->detach_user(c->self, NULL); |
1669 | /* if we still have a callback */ | |
1670 | if (c->detach_user != NULL) | |
1671 | return; | |
d7ac5f18 | 1672 | debug2("channel %d: gc: user detached", c->self); |
418e724c | 1673 | } |
1674 | if (!chan_is_dead(c, 1)) | |
1675 | return; | |
d7ac5f18 | 1676 | debug2("channel %d: garbage collecting", c->self); |
418e724c | 1677 | channel_free(c); |
1678 | } | |
1679 | ||
396c147e | 1680 | static void |
7368a6c8 | 1681 | channel_handler(chan_fn *ftab[], fd_set * readset, fd_set * writeset) |
1682 | { | |
1683 | static int did_init = 0; | |
9a995072 | 1684 | u_int i; |
7368a6c8 | 1685 | Channel *c; |
1686 | ||
1687 | if (!did_init) { | |
1688 | channel_handler_init(); | |
1689 | did_init = 1; | |
1690 | } | |
1691 | for (i = 0; i < channels_alloc; i++) { | |
719fc62f | 1692 | c = channels[i]; |
1693 | if (c == NULL) | |
5260325f | 1694 | continue; |
6fd8622b | 1695 | if (ftab[c->type] != NULL) |
1696 | (*ftab[c->type])(c, readset, writeset); | |
418e724c | 1697 | channel_garbage_collect(c); |
8efc0c15 | 1698 | } |
8efc0c15 | 1699 | } |
1700 | ||
8e7895b8 | 1701 | /* |
1702 | * Allocate/update select bitmasks and add any bits relevant to channels in | |
1703 | * select bitmasks. | |
1704 | */ | |
6ae2364d | 1705 | void |
c422989b | 1706 | channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp, |
9a995072 | 1707 | u_int *nallocp, int rekeying) |
7368a6c8 | 1708 | { |
9a995072 | 1709 | u_int n, sz; |
39929cdb | 1710 | |
1711 | n = MAX(*maxfdp, channel_max_fd); | |
1712 | ||
1713 | sz = howmany(n+1, NFDBITS) * sizeof(fd_mask); | |
489aa2e9 | 1714 | /* perhaps check sz < nalloc/2 and shrink? */ |
1715 | if (*readsetp == NULL || sz > *nallocp) { | |
1716 | *readsetp = xrealloc(*readsetp, sz); | |
1717 | *writesetp = xrealloc(*writesetp, sz); | |
1718 | *nallocp = sz; | |
39929cdb | 1719 | } |
489aa2e9 | 1720 | *maxfdp = n; |
39929cdb | 1721 | memset(*readsetp, 0, sz); |
1722 | memset(*writesetp, 0, sz); | |
1723 | ||
c422989b | 1724 | if (!rekeying) |
1725 | channel_handler(channel_pre, *readsetp, *writesetp); | |
7368a6c8 | 1726 | } |
1727 | ||
8e7895b8 | 1728 | /* |
1729 | * After select, perform any appropriate operations for channels which have | |
1730 | * events pending. | |
1731 | */ | |
6ae2364d | 1732 | void |
7368a6c8 | 1733 | channel_after_select(fd_set * readset, fd_set * writeset) |
1734 | { | |
1735 | channel_handler(channel_post, readset, writeset); | |
1736 | } | |
1737 | ||
8e7895b8 | 1738 | |
39929cdb | 1739 | /* If there is data to send to the connection, enqueue some of it now. */ |
8efc0c15 | 1740 | |
6ae2364d | 1741 | void |
d5bb9418 | 1742 | channel_output_poll(void) |
8efc0c15 | 1743 | { |
7368a6c8 | 1744 | Channel *c; |
9a995072 | 1745 | u_int i, len; |
5260325f | 1746 | |
1747 | for (i = 0; i < channels_alloc; i++) { | |
719fc62f | 1748 | c = channels[i]; |
1749 | if (c == NULL) | |
1750 | continue; | |
48e671d5 | 1751 | |
8e7895b8 | 1752 | /* |
1753 | * We are only interested in channels that can have buffered | |
1754 | * incoming data. | |
1755 | */ | |
48e671d5 | 1756 | if (compat13) { |
7368a6c8 | 1757 | if (c->type != SSH_CHANNEL_OPEN && |
1758 | c->type != SSH_CHANNEL_INPUT_DRAINING) | |
48e671d5 | 1759 | continue; |
1760 | } else { | |
7368a6c8 | 1761 | if (c->type != SSH_CHANNEL_OPEN) |
48e671d5 | 1762 | continue; |
48e671d5 | 1763 | } |
e78a59f5 | 1764 | if (compat20 && |
1765 | (c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) { | |
ee55dacf | 1766 | /* XXX is this true? */ |
418e724c | 1767 | debug3("channel %d: will not send data after close", c->self); |
7e7327a1 | 1768 | continue; |
1769 | } | |
5260325f | 1770 | |
1771 | /* Get the amount of buffered data for this channel. */ | |
ee55dacf | 1772 | if ((c->istate == CHAN_INPUT_OPEN || |
1773 | c->istate == CHAN_INPUT_WAIT_DRAIN) && | |
1774 | (len = buffer_len(&c->input)) > 0) { | |
8e7895b8 | 1775 | /* |
1776 | * Send some data for the other side over the secure | |
1777 | * connection. | |
1778 | */ | |
7e7327a1 | 1779 | if (compat20) { |
1780 | if (len > c->remote_window) | |
1781 | len = c->remote_window; | |
1782 | if (len > c->remote_maxpacket) | |
1783 | len = c->remote_maxpacket; | |
5260325f | 1784 | } else { |
7e7327a1 | 1785 | if (packet_is_interactive()) { |
1786 | if (len > 1024) | |
1787 | len = 512; | |
1788 | } else { | |
1789 | /* Keep the packets at reasonable size. */ | |
1790 | if (len > packet_get_maxsize()/2) | |
1791 | len = packet_get_maxsize()/2; | |
1792 | } | |
5260325f | 1793 | } |
7368a6c8 | 1794 | if (len > 0) { |
7e7327a1 | 1795 | packet_start(compat20 ? |
1796 | SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA); | |
7368a6c8 | 1797 | packet_put_int(c->remote_id); |
1798 | packet_put_string(buffer_ptr(&c->input), len); | |
1799 | packet_send(); | |
1800 | buffer_consume(&c->input, len); | |
1801 | c->remote_window -= len; | |
7368a6c8 | 1802 | } |
1803 | } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) { | |
5260325f | 1804 | if (compat13) |
1805 | fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3"); | |
aa3378df | 1806 | /* |
1807 | * input-buffer is empty and read-socket shutdown: | |
d2296ed7 | 1808 | * tell peer, that we will not send more data: send IEOF. |
1809 | * hack for extended data: delay EOF if EFD still in use. | |
aa3378df | 1810 | */ |
d2296ed7 | 1811 | if (CHANNEL_EFD_INPUT_ACTIVE(c)) |
875ec275 | 1812 | debug2("channel %d: ibuf_empty delayed efd %d/(%d)", |
1813 | c->self, c->efd, buffer_len(&c->extended)); | |
d2296ed7 | 1814 | else |
1815 | chan_ibuf_empty(c); | |
5260325f | 1816 | } |
7e7327a1 | 1817 | /* Send extended data, i.e. stderr */ |
1818 | if (compat20 && | |
d2296ed7 | 1819 | !(c->flags & CHAN_EOF_SENT) && |
7e7327a1 | 1820 | c->remote_window > 0 && |
1821 | (len = buffer_len(&c->extended)) > 0 && | |
1822 | c->extended_usage == CHAN_EXTENDED_READ) { | |
f91d9a89 | 1823 | debug2("channel %d: rwin %u elen %u euse %d", |
ee55dacf | 1824 | c->self, c->remote_window, buffer_len(&c->extended), |
1825 | c->extended_usage); | |
7e7327a1 | 1826 | if (len > c->remote_window) |
1827 | len = c->remote_window; | |
1828 | if (len > c->remote_maxpacket) | |
1829 | len = c->remote_maxpacket; | |
1830 | packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA); | |
1831 | packet_put_int(c->remote_id); | |
1832 | packet_put_int(SSH2_EXTENDED_DATA_STDERR); | |
1833 | packet_put_string(buffer_ptr(&c->extended), len); | |
1834 | packet_send(); | |
1835 | buffer_consume(&c->extended, len); | |
1836 | c->remote_window -= len; | |
ee55dacf | 1837 | debug2("channel %d: sent ext data %d", c->self, len); |
7e7327a1 | 1838 | } |
8efc0c15 | 1839 | } |
8efc0c15 | 1840 | } |
1841 | ||
8e7895b8 | 1842 | |
1843 | /* -- protocol input */ | |
8efc0c15 | 1844 | |
6ae2364d | 1845 | void |
7819b5c3 | 1846 | channel_input_data(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 1847 | { |
48e671d5 | 1848 | int id; |
5260325f | 1849 | char *data; |
1e3b8b07 | 1850 | u_int data_len; |
7368a6c8 | 1851 | Channel *c; |
5260325f | 1852 | |
1853 | /* Get the channel number and verify it. */ | |
48e671d5 | 1854 | id = packet_get_int(); |
7368a6c8 | 1855 | c = channel_lookup(id); |
1856 | if (c == NULL) | |
48e671d5 | 1857 | packet_disconnect("Received data for nonexistent channel %d.", id); |
5260325f | 1858 | |
1859 | /* Ignore any data for non-open channels (might happen on close) */ | |
7368a6c8 | 1860 | if (c->type != SSH_CHANNEL_OPEN && |
1861 | c->type != SSH_CHANNEL_X11_OPEN) | |
48e671d5 | 1862 | return; |
1863 | ||
5260325f | 1864 | /* Get the data. */ |
1865 | data = packet_get_string(&data_len); | |
7368a6c8 | 1866 | |
7741e239 | 1867 | /* |
1868 | * Ignore data for protocol > 1.3 if output end is no longer open. | |
1869 | * For protocol 2 the sending side is reducing its window as it sends | |
1870 | * data, so we must 'fake' consumption of the data in order to ensure | |
1871 | * that window updates are sent back. Otherwise the connection might | |
1872 | * deadlock. | |
1873 | */ | |
1874 | if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN) { | |
1875 | if (compat20) { | |
1876 | c->local_window -= data_len; | |
1877 | c->local_consumed += data_len; | |
1878 | } | |
1879 | xfree(data); | |
1880 | return; | |
1881 | } | |
1882 | ||
6aacefa7 | 1883 | if (compat20) { |
7e7327a1 | 1884 | if (data_len > c->local_maxpacket) { |
bbe88b6d | 1885 | logit("channel %d: rcvd big packet %d, maxpack %d", |
7e7327a1 | 1886 | c->self, data_len, c->local_maxpacket); |
1887 | } | |
1888 | if (data_len > c->local_window) { | |
bbe88b6d | 1889 | logit("channel %d: rcvd too much data %d, win %d", |
7e7327a1 | 1890 | c->self, data_len, c->local_window); |
1891 | xfree(data); | |
1892 | return; | |
1893 | } | |
1894 | c->local_window -= data_len; | |
7e7327a1 | 1895 | } |
95500969 | 1896 | packet_check_eom(); |
7368a6c8 | 1897 | buffer_append(&c->output, data, data_len); |
5260325f | 1898 | xfree(data); |
8efc0c15 | 1899 | } |
8e7895b8 | 1900 | |
6ae2364d | 1901 | void |
7819b5c3 | 1902 | channel_input_extended_data(int type, u_int32_t seq, void *ctxt) |
7e7327a1 | 1903 | { |
1904 | int id; | |
7e7327a1 | 1905 | char *data; |
a594fa74 | 1906 | u_int data_len, tcode; |
7e7327a1 | 1907 | Channel *c; |
1908 | ||
1909 | /* Get the channel number and verify it. */ | |
1910 | id = packet_get_int(); | |
1911 | c = channel_lookup(id); | |
1912 | ||
1913 | if (c == NULL) | |
1914 | packet_disconnect("Received extended_data for bad channel %d.", id); | |
1915 | if (c->type != SSH_CHANNEL_OPEN) { | |
bbe88b6d | 1916 | logit("channel %d: ext data for non open", id); |
7e7327a1 | 1917 | return; |
1918 | } | |
d2296ed7 | 1919 | if (c->flags & CHAN_EOF_RCVD) { |
1920 | if (datafellows & SSH_BUG_EXTEOF) | |
1921 | debug("channel %d: accepting ext data after eof", id); | |
1922 | else | |
1923 | packet_disconnect("Received extended_data after EOF " | |
1924 | "on channel %d.", id); | |
1925 | } | |
7e7327a1 | 1926 | tcode = packet_get_int(); |
1927 | if (c->efd == -1 || | |
1928 | c->extended_usage != CHAN_EXTENDED_WRITE || | |
1929 | tcode != SSH2_EXTENDED_DATA_STDERR) { | |
bbe88b6d | 1930 | logit("channel %d: bad ext data", c->self); |
7e7327a1 | 1931 | return; |
1932 | } | |
1933 | data = packet_get_string(&data_len); | |
95500969 | 1934 | packet_check_eom(); |
7e7327a1 | 1935 | if (data_len > c->local_window) { |
bbe88b6d | 1936 | logit("channel %d: rcvd too much extended_data %d, win %d", |
7e7327a1 | 1937 | c->self, data_len, c->local_window); |
1938 | xfree(data); | |
1939 | return; | |
1940 | } | |
de273eef | 1941 | debug2("channel %d: rcvd ext data %d", c->self, data_len); |
7e7327a1 | 1942 | c->local_window -= data_len; |
1943 | buffer_append(&c->extended, data, data_len); | |
1944 | xfree(data); | |
1945 | } | |
1946 | ||
6ae2364d | 1947 | void |
7819b5c3 | 1948 | channel_input_ieof(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 1949 | { |
1950 | int id; | |
1951 | Channel *c; | |
1952 | ||
7368a6c8 | 1953 | id = packet_get_int(); |
95500969 | 1954 | packet_check_eom(); |
7368a6c8 | 1955 | c = channel_lookup(id); |
1956 | if (c == NULL) | |
1957 | packet_disconnect("Received ieof for nonexistent channel %d.", id); | |
1958 | chan_rcvd_ieof(c); | |
a5f82435 | 1959 | |
1960 | /* XXX force input close */ | |
8341f420 | 1961 | if (c->force_drain && c->istate == CHAN_INPUT_OPEN) { |
a5f82435 | 1962 | debug("channel %d: FORCE input drain", c->self); |
1963 | c->istate = CHAN_INPUT_WAIT_DRAIN; | |
32e7d71f | 1964 | if (buffer_len(&c->input) == 0) |
1965 | chan_ibuf_empty(c); | |
a5f82435 | 1966 | } |
1967 | ||
7368a6c8 | 1968 | } |
8efc0c15 | 1969 | |
6ae2364d | 1970 | void |
7819b5c3 | 1971 | channel_input_close(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 1972 | { |
7368a6c8 | 1973 | int id; |
1974 | Channel *c; | |
5260325f | 1975 | |
7368a6c8 | 1976 | id = packet_get_int(); |
95500969 | 1977 | packet_check_eom(); |
7368a6c8 | 1978 | c = channel_lookup(id); |
1979 | if (c == NULL) | |
1980 | packet_disconnect("Received close for nonexistent channel %d.", id); | |
aa3378df | 1981 | |
1982 | /* | |
1983 | * Send a confirmation that we have closed the channel and no more | |
1984 | * data is coming for it. | |
1985 | */ | |
5260325f | 1986 | packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION); |
7368a6c8 | 1987 | packet_put_int(c->remote_id); |
5260325f | 1988 | packet_send(); |
1989 | ||
aa3378df | 1990 | /* |
1991 | * If the channel is in closed state, we have sent a close request, | |
1992 | * and the other side will eventually respond with a confirmation. | |
1993 | * Thus, we cannot free the channel here, because then there would be | |
1994 | * no-one to receive the confirmation. The channel gets freed when | |
1995 | * the confirmation arrives. | |
1996 | */ | |
7368a6c8 | 1997 | if (c->type != SSH_CHANNEL_CLOSED) { |
aa3378df | 1998 | /* |
1999 | * Not a closed channel - mark it as draining, which will | |
2000 | * cause it to be freed later. | |
2001 | */ | |
9c50edcf | 2002 | buffer_clear(&c->input); |
7368a6c8 | 2003 | c->type = SSH_CHANNEL_OUTPUT_DRAINING; |
5260325f | 2004 | } |
8efc0c15 | 2005 | } |
2006 | ||
7368a6c8 | 2007 | /* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */ |
6ae2364d | 2008 | void |
7819b5c3 | 2009 | channel_input_oclose(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2010 | { |
7368a6c8 | 2011 | int id = packet_get_int(); |
2012 | Channel *c = channel_lookup(id); | |
a8a21a53 | 2013 | |
95500969 | 2014 | packet_check_eom(); |
7368a6c8 | 2015 | if (c == NULL) |
2016 | packet_disconnect("Received oclose for nonexistent channel %d.", id); | |
2017 | chan_rcvd_oclose(c); | |
8efc0c15 | 2018 | } |
2019 | ||
6ae2364d | 2020 | void |
7819b5c3 | 2021 | channel_input_close_confirmation(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 2022 | { |
2023 | int id = packet_get_int(); | |
2024 | Channel *c = channel_lookup(id); | |
2025 | ||
95500969 | 2026 | packet_check_eom(); |
7368a6c8 | 2027 | if (c == NULL) |
2028 | packet_disconnect("Received close confirmation for " | |
2029 | "out-of-range channel %d.", id); | |
2030 | if (c->type != SSH_CHANNEL_CLOSED) | |
2031 | packet_disconnect("Received close confirmation for " | |
2032 | "non-closed channel %d (type %d).", id, c->type); | |
719fc62f | 2033 | channel_free(c); |
7368a6c8 | 2034 | } |
8efc0c15 | 2035 | |
6ae2364d | 2036 | void |
7819b5c3 | 2037 | channel_input_open_confirmation(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2038 | { |
7368a6c8 | 2039 | int id, remote_id; |
2040 | Channel *c; | |
5260325f | 2041 | |
7368a6c8 | 2042 | id = packet_get_int(); |
2043 | c = channel_lookup(id); | |
5260325f | 2044 | |
7368a6c8 | 2045 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) |
2046 | packet_disconnect("Received open confirmation for " | |
2047 | "non-opening channel %d.", id); | |
2048 | remote_id = packet_get_int(); | |
aa3378df | 2049 | /* Record the remote channel number and mark that the channel is now open. */ |
7368a6c8 | 2050 | c->remote_id = remote_id; |
2051 | c->type = SSH_CHANNEL_OPEN; | |
7e7327a1 | 2052 | |
2053 | if (compat20) { | |
2054 | c->remote_window = packet_get_int(); | |
2055 | c->remote_maxpacket = packet_get_int(); | |
05ca0898 | 2056 | if (c->confirm) { |
de273eef | 2057 | debug2("callback start"); |
5e96b616 | 2058 | c->confirm(c->self, c->confirm_ctx); |
de273eef | 2059 | debug2("callback done"); |
7e7327a1 | 2060 | } |
d7ac5f18 | 2061 | debug2("channel %d: open confirm rwindow %u rmax %u", c->self, |
7e7327a1 | 2062 | c->remote_window, c->remote_maxpacket); |
2063 | } | |
95500969 | 2064 | packet_check_eom(); |
8efc0c15 | 2065 | } |
2066 | ||
396c147e | 2067 | static char * |
d18e0850 | 2068 | reason2txt(int reason) |
2069 | { | |
6aacefa7 | 2070 | switch (reason) { |
d18e0850 | 2071 | case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED: |
2072 | return "administratively prohibited"; | |
2073 | case SSH2_OPEN_CONNECT_FAILED: | |
2074 | return "connect failed"; | |
2075 | case SSH2_OPEN_UNKNOWN_CHANNEL_TYPE: | |
2076 | return "unknown channel type"; | |
2077 | case SSH2_OPEN_RESOURCE_SHORTAGE: | |
2078 | return "resource shortage"; | |
2079 | } | |
7e8c18e9 | 2080 | return "unknown reason"; |
d18e0850 | 2081 | } |
2082 | ||
6ae2364d | 2083 | void |
7819b5c3 | 2084 | channel_input_open_failure(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2085 | { |
02a024dd | 2086 | int id, reason; |
2087 | char *msg = NULL, *lang = NULL; | |
7368a6c8 | 2088 | Channel *c; |
5260325f | 2089 | |
7368a6c8 | 2090 | id = packet_get_int(); |
2091 | c = channel_lookup(id); | |
2092 | ||
2093 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) | |
2094 | packet_disconnect("Received open failure for " | |
2095 | "non-opening channel %d.", id); | |
7e7327a1 | 2096 | if (compat20) { |
02a024dd | 2097 | reason = packet_get_int(); |
fbe90f7b | 2098 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { |
02a024dd | 2099 | msg = packet_get_string(NULL); |
2100 | lang = packet_get_string(NULL); | |
2101 | } | |
bbe88b6d | 2102 | logit("channel %d: open failed: %s%s%s", id, |
d18e0850 | 2103 | reason2txt(reason), msg ? ": ": "", msg ? msg : ""); |
02a024dd | 2104 | if (msg != NULL) |
2105 | xfree(msg); | |
2106 | if (lang != NULL) | |
2107 | xfree(lang); | |
7e7327a1 | 2108 | } |
95500969 | 2109 | packet_check_eom(); |
5260325f | 2110 | /* Free the channel. This will also close the socket. */ |
719fc62f | 2111 | channel_free(c); |
8efc0c15 | 2112 | } |
2113 | ||
8e7895b8 | 2114 | void |
7819b5c3 | 2115 | channel_input_window_adjust(int type, u_int32_t seq, void *ctxt) |
8e7895b8 | 2116 | { |
2117 | Channel *c; | |
f91d9a89 | 2118 | int id; |
2119 | u_int adjust; | |
3ffc6336 | 2120 | |
8e7895b8 | 2121 | if (!compat20) |
2122 | return; | |
8efc0c15 | 2123 | |
8e7895b8 | 2124 | /* Get the channel number and verify it. */ |
2125 | id = packet_get_int(); | |
2126 | c = channel_lookup(id); | |
2127 | ||
2128 | if (c == NULL || c->type != SSH_CHANNEL_OPEN) { | |
bbe88b6d | 2129 | logit("Received window adjust for " |
8e7895b8 | 2130 | "non-open channel %d.", id); |
2131 | return; | |
2132 | } | |
2133 | adjust = packet_get_int(); | |
95500969 | 2134 | packet_check_eom(); |
f91d9a89 | 2135 | debug2("channel %d: rcvd adjust %u", id, adjust); |
8e7895b8 | 2136 | c->remote_window += adjust; |
2137 | } | |
2138 | ||
2139 | void | |
7819b5c3 | 2140 | channel_input_port_open(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2141 | { |
8e7895b8 | 2142 | Channel *c = NULL; |
2143 | u_short host_port; | |
2144 | char *host, *originator_string; | |
2145 | int remote_id, sock = -1; | |
5260325f | 2146 | |
8e7895b8 | 2147 | remote_id = packet_get_int(); |
2148 | host = packet_get_string(NULL); | |
2149 | host_port = packet_get_int(); | |
2150 | ||
2151 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) { | |
2152 | originator_string = packet_get_string(NULL); | |
2153 | } else { | |
2154 | originator_string = xstrdup("unknown (remote did not supply name)"); | |
2155 | } | |
95500969 | 2156 | packet_check_eom(); |
8e7895b8 | 2157 | sock = channel_connect_to(host, host_port); |
2158 | if (sock != -1) { | |
2159 | c = channel_new("connected socket", | |
2160 | SSH_CHANNEL_CONNECTING, sock, sock, -1, 0, 0, 0, | |
2161 | originator_string, 1); | |
3a0d3d54 | 2162 | c->remote_id = remote_id; |
5260325f | 2163 | } |
0d942eff | 2164 | xfree(originator_string); |
8e7895b8 | 2165 | if (c == NULL) { |
2166 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
2167 | packet_put_int(remote_id); | |
2168 | packet_send(); | |
2169 | } | |
2170 | xfree(host); | |
8efc0c15 | 2171 | } |
2172 | ||
8e7895b8 | 2173 | |
2174 | /* -- tcp forwarding */ | |
2175 | ||
5e4a7219 | 2176 | void |
2177 | channel_set_af(int af) | |
2178 | { | |
2179 | IPv4or6 = af; | |
2180 | } | |
2181 | ||
5641aefa | 2182 | static int |
2183 | channel_setup_fwd_listener(int type, const char *listen_addr, u_short listen_port, | |
2184 | const char *host_to_connect, u_short port_to_connect, int gateway_ports) | |
8efc0c15 | 2185 | { |
719fc62f | 2186 | Channel *c; |
3867aa0a | 2187 | int sock, r, success = 0, on = 1, wildcard = 0, is_client; |
48e671d5 | 2188 | struct addrinfo hints, *ai, *aitop; |
3867aa0a | 2189 | const char *host, *addr; |
5641aefa | 2190 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
5260325f | 2191 | |
5641aefa | 2192 | host = (type == SSH_CHANNEL_RPORT_LISTENER) ? |
2193 | listen_addr : host_to_connect; | |
3867aa0a | 2194 | is_client = (type == SSH_CHANNEL_PORT_LISTENER); |
02a024dd | 2195 | |
5641aefa | 2196 | if (host == NULL) { |
2197 | error("No forward host name."); | |
2198 | return success; | |
fa08c86b | 2199 | } |
719fc62f | 2200 | if (strlen(host) > SSH_CHANNEL_PATH_LEN - 1) { |
02a024dd | 2201 | error("Forward host name too long."); |
2202 | return success; | |
2203 | } | |
5260325f | 2204 | |
3867aa0a | 2205 | /* |
2206 | * Determine whether or not a port forward listens to loopback, | |
f8cc7664 | 2207 | * specified address or wildcard. On the client, a specified bind |
2208 | * address will always override gateway_ports. On the server, a | |
2209 | * gateway_ports of 1 (``yes'') will override the client's | |
2210 | * specification and force a wildcard bind, whereas a value of 2 | |
2211 | * (``clientspecified'') will bind to whatever address the client | |
3867aa0a | 2212 | * asked for. |
2213 | * | |
2214 | * Special-case listen_addrs are: | |
2215 | * | |
2216 | * "0.0.0.0" -> wildcard v4/v6 if SSH_OLD_FORWARD_ADDR | |
2217 | * "" (empty string), "*" -> wildcard v4/v6 | |
2218 | * "localhost" -> loopback v4/v6 | |
2219 | */ | |
2220 | addr = NULL; | |
2221 | if (listen_addr == NULL) { | |
2222 | /* No address specified: default to gateway_ports setting */ | |
2223 | if (gateway_ports) | |
2224 | wildcard = 1; | |
2225 | } else if (gateway_ports || is_client) { | |
2226 | if (((datafellows & SSH_OLD_FORWARD_ADDR) && | |
2227 | strcmp(listen_addr, "0.0.0.0") == 0) || | |
2228 | *listen_addr == '\0' || strcmp(listen_addr, "*") == 0 || | |
2229 | (!is_client && gateway_ports == 1)) | |
2230 | wildcard = 1; | |
2231 | else if (strcmp(listen_addr, "localhost") != 0) | |
2232 | addr = listen_addr; | |
2233 | } | |
2234 | ||
2235 | debug3("channel_setup_fwd_listener: type %d wildcard %d addr %s", | |
2236 | type, wildcard, (addr == NULL) ? "NULL" : addr); | |
2237 | ||
aa3378df | 2238 | /* |
48e671d5 | 2239 | * getaddrinfo returns a loopback address if the hostname is |
2240 | * set to NULL and hints.ai_flags is not AI_PASSIVE | |
aa3378df | 2241 | */ |
48e671d5 | 2242 | memset(&hints, 0, sizeof(hints)); |
2243 | hints.ai_family = IPv4or6; | |
3867aa0a | 2244 | hints.ai_flags = wildcard ? AI_PASSIVE : 0; |
48e671d5 | 2245 | hints.ai_socktype = SOCK_STREAM; |
fa08c86b | 2246 | snprintf(strport, sizeof strport, "%d", listen_port); |
3867aa0a | 2247 | if ((r = getaddrinfo(addr, strport, &hints, &aitop)) != 0) { |
2248 | if (addr == NULL) { | |
2249 | /* This really shouldn't happen */ | |
2250 | packet_disconnect("getaddrinfo: fatal error: %s", | |
2251 | gai_strerror(r)); | |
2252 | } else { | |
2253 | verbose("channel_setup_fwd_listener: " | |
2254 | "getaddrinfo(%.64s): %s", addr, gai_strerror(r)); | |
2255 | packet_send_debug("channel_setup_fwd_listener: " | |
2256 | "getaddrinfo(%.64s): %s", addr, gai_strerror(r)); | |
2257 | } | |
2258 | aitop = NULL; | |
2259 | } | |
48e671d5 | 2260 | |
48e671d5 | 2261 | for (ai = aitop; ai; ai = ai->ai_next) { |
2262 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
2263 | continue; | |
2264 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), | |
2265 | strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { | |
5641aefa | 2266 | error("channel_setup_fwd_listener: getnameinfo failed"); |
48e671d5 | 2267 | continue; |
2268 | } | |
2269 | /* Create a port to listen for the host. */ | |
3e131a6d | 2270 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
48e671d5 | 2271 | if (sock < 0) { |
2272 | /* this is no error since kernel may not support ipv6 */ | |
2273 | verbose("socket: %.100s", strerror(errno)); | |
2274 | continue; | |
2275 | } | |
2276 | /* | |
facfd613 | 2277 | * Set socket options. |
2278 | * Allow local port reuse in TIME_WAIT. | |
48e671d5 | 2279 | */ |
facfd613 | 2280 | if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &on, |
2281 | sizeof(on)) == -1) | |
2282 | error("setsockopt SO_REUSEADDR: %s", strerror(errno)); | |
2283 | ||
48e671d5 | 2284 | debug("Local forwarding listening on %s port %s.", ntop, strport); |
2285 | ||
2286 | /* Bind the socket to the address. */ | |
2287 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { | |
2288 | /* address can be in use ipv6 address is already bound */ | |
16218745 | 2289 | if (!ai->ai_next) |
2290 | error("bind: %.100s", strerror(errno)); | |
2291 | else | |
2292 | verbose("bind: %.100s", strerror(errno)); | |
2b87da3b | 2293 | |
48e671d5 | 2294 | close(sock); |
2295 | continue; | |
2296 | } | |
2297 | /* Start listening for connections on the socket. */ | |
fce39749 | 2298 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { |
48e671d5 | 2299 | error("listen: %.100s", strerror(errno)); |
2300 | close(sock); | |
2301 | continue; | |
2302 | } | |
2303 | /* Allocate a channel number for the socket. */ | |
8e7895b8 | 2304 | c = channel_new("port listener", type, sock, sock, -1, |
0b242b12 | 2305 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, |
0d942eff | 2306 | 0, "port listener", 1); |
719fc62f | 2307 | strlcpy(c->path, host, sizeof(c->path)); |
2308 | c->host_port = port_to_connect; | |
2309 | c->listening_port = listen_port; | |
48e671d5 | 2310 | success = 1; |
2311 | } | |
2312 | if (success == 0) | |
5641aefa | 2313 | error("channel_setup_fwd_listener: cannot listen to port: %d", |
02a024dd | 2314 | listen_port); |
48e671d5 | 2315 | freeaddrinfo(aitop); |
02a024dd | 2316 | return success; |
5260325f | 2317 | } |
8efc0c15 | 2318 | |
d740ec16 | 2319 | int |
2320 | channel_cancel_rport_listener(const char *host, u_short port) | |
2321 | { | |
9a995072 | 2322 | u_int i; |
2323 | int found = 0; | |
d740ec16 | 2324 | |
f8cc7664 | 2325 | for (i = 0; i < channels_alloc; i++) { |
d740ec16 | 2326 | Channel *c = channels[i]; |
2327 | ||
2328 | if (c != NULL && c->type == SSH_CHANNEL_RPORT_LISTENER && | |
2329 | strncmp(c->path, host, sizeof(c->path)) == 0 && | |
f2107e97 | 2330 | c->listening_port == port) { |
2912cbd6 | 2331 | debug2("%s: close channel %d", __func__, i); |
d740ec16 | 2332 | channel_free(c); |
2333 | found = 1; | |
2334 | } | |
2335 | } | |
2336 | ||
2337 | return (found); | |
2338 | } | |
2339 | ||
5641aefa | 2340 | /* protocol local port fwd, used by ssh (and sshd in v1) */ |
2341 | int | |
3867aa0a | 2342 | channel_setup_local_fwd_listener(const char *listen_host, u_short listen_port, |
5641aefa | 2343 | const char *host_to_connect, u_short port_to_connect, int gateway_ports) |
2344 | { | |
2345 | return channel_setup_fwd_listener(SSH_CHANNEL_PORT_LISTENER, | |
3867aa0a | 2346 | listen_host, listen_port, host_to_connect, port_to_connect, |
2347 | gateway_ports); | |
5641aefa | 2348 | } |
2349 | ||
2350 | /* protocol v2 remote port fwd, used by sshd */ | |
2351 | int | |
2352 | channel_setup_remote_fwd_listener(const char *listen_address, | |
2353 | u_short listen_port, int gateway_ports) | |
2354 | { | |
2355 | return channel_setup_fwd_listener(SSH_CHANNEL_RPORT_LISTENER, | |
2356 | listen_address, listen_port, NULL, 0, gateway_ports); | |
2357 | } | |
2358 | ||
aa3378df | 2359 | /* |
2360 | * Initiate forwarding of connections to port "port" on remote host through | |
2361 | * the secure channel to host:port from local side. | |
2362 | */ | |
8efc0c15 | 2363 | |
6ae2364d | 2364 | void |
3867aa0a | 2365 | channel_request_remote_forwarding(const char *listen_host, u_short listen_port, |
fa08c86b | 2366 | const char *host_to_connect, u_short port_to_connect) |
8efc0c15 | 2367 | { |
54a5250f | 2368 | int type, success = 0; |
fa08c86b | 2369 | |
5260325f | 2370 | /* Record locally that connection to this host/port is permitted. */ |
2371 | if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
2372 | fatal("channel_request_remote_forwarding: too many forwards"); | |
2373 | ||
5260325f | 2374 | /* Send the forward request to the remote side. */ |
7e7327a1 | 2375 | if (compat20) { |
3867aa0a | 2376 | const char *address_to_bind; |
2377 | if (listen_host == NULL) | |
2378 | address_to_bind = "localhost"; | |
2379 | else if (*listen_host == '\0' || strcmp(listen_host, "*") == 0) | |
2380 | address_to_bind = ""; | |
2381 | else | |
2382 | address_to_bind = listen_host; | |
2383 | ||
7e7327a1 | 2384 | packet_start(SSH2_MSG_GLOBAL_REQUEST); |
2385 | packet_put_cstring("tcpip-forward"); | |
e0ae8728 | 2386 | packet_put_char(1); /* boolean: want reply */ |
7e7327a1 | 2387 | packet_put_cstring(address_to_bind); |
2388 | packet_put_int(listen_port); | |
fa08c86b | 2389 | packet_send(); |
2390 | packet_write_wait(); | |
2391 | /* Assume that server accepts the request */ | |
2392 | success = 1; | |
7e7327a1 | 2393 | } else { |
2394 | packet_start(SSH_CMSG_PORT_FORWARD_REQUEST); | |
7e7327a1 | 2395 | packet_put_int(listen_port); |
d6f24e45 | 2396 | packet_put_cstring(host_to_connect); |
2397 | packet_put_int(port_to_connect); | |
7e7327a1 | 2398 | packet_send(); |
2399 | packet_write_wait(); | |
fa08c86b | 2400 | |
2401 | /* Wait for response from the remote side. */ | |
54a5250f | 2402 | type = packet_read(); |
fa08c86b | 2403 | switch (type) { |
2404 | case SSH_SMSG_SUCCESS: | |
2405 | success = 1; | |
2406 | break; | |
2407 | case SSH_SMSG_FAILURE: | |
bbe88b6d | 2408 | logit("Warning: Server denied remote port forwarding."); |
fa08c86b | 2409 | break; |
2410 | default: | |
2411 | /* Unknown packet */ | |
2412 | packet_disconnect("Protocol error for port forward request:" | |
2413 | "received packet type %d.", type); | |
2414 | } | |
2415 | } | |
2416 | if (success) { | |
2417 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host_to_connect); | |
2418 | permitted_opens[num_permitted_opens].port_to_connect = port_to_connect; | |
2419 | permitted_opens[num_permitted_opens].listen_port = listen_port; | |
2420 | num_permitted_opens++; | |
7e7327a1 | 2421 | } |
8efc0c15 | 2422 | } |
2423 | ||
d740ec16 | 2424 | /* |
f2107e97 | 2425 | * Request cancellation of remote forwarding of connection host:port from |
d740ec16 | 2426 | * local side. |
2427 | */ | |
d740ec16 | 2428 | void |
3867aa0a | 2429 | channel_request_rforward_cancel(const char *host, u_short port) |
d740ec16 | 2430 | { |
2431 | int i; | |
d740ec16 | 2432 | |
2433 | if (!compat20) | |
2434 | return; | |
2435 | ||
2436 | for (i = 0; i < num_permitted_opens; i++) { | |
f2107e97 | 2437 | if (permitted_opens[i].host_to_connect != NULL && |
d740ec16 | 2438 | permitted_opens[i].listen_port == port) |
2439 | break; | |
2440 | } | |
2441 | if (i >= num_permitted_opens) { | |
2442 | debug("%s: requested forward not found", __func__); | |
2443 | return; | |
2444 | } | |
2445 | packet_start(SSH2_MSG_GLOBAL_REQUEST); | |
2446 | packet_put_cstring("cancel-tcpip-forward"); | |
2447 | packet_put_char(0); | |
3867aa0a | 2448 | packet_put_cstring(host == NULL ? "" : host); |
d740ec16 | 2449 | packet_put_int(port); |
2450 | packet_send(); | |
2451 | ||
2452 | permitted_opens[i].listen_port = 0; | |
2453 | permitted_opens[i].port_to_connect = 0; | |
2454 | free(permitted_opens[i].host_to_connect); | |
2455 | permitted_opens[i].host_to_connect = NULL; | |
2456 | } | |
2457 | ||
aa3378df | 2458 | /* |
2459 | * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates | |
2460 | * listening for the port, and sends back a success reply (or disconnect | |
2461 | * message if there was an error). This never returns if there was an error. | |
2462 | */ | |
8efc0c15 | 2463 | |
6ae2364d | 2464 | void |
1d1ffb87 | 2465 | channel_input_port_forward_request(int is_root, int gateway_ports) |
8efc0c15 | 2466 | { |
57112b5a | 2467 | u_short port, host_port; |
5260325f | 2468 | char *hostname; |
2469 | ||
2470 | /* Get arguments from the packet. */ | |
2471 | port = packet_get_int(); | |
2472 | hostname = packet_get_string(NULL); | |
2473 | host_port = packet_get_int(); | |
2474 | ||
3c62e7eb | 2475 | #ifndef HAVE_CYGWIN |
aa3378df | 2476 | /* |
2477 | * Check that an unprivileged user is not trying to forward a | |
2478 | * privileged port. | |
2479 | */ | |
5260325f | 2480 | if (port < IPPORT_RESERVED && !is_root) |
8e7c9afc | 2481 | packet_disconnect( |
2482 | "Requested forwarding of port %d but user is not root.", | |
2483 | port); | |
2484 | if (host_port == 0) | |
2485 | packet_disconnect("Dynamic forwarding denied."); | |
3c62e7eb | 2486 | #endif |
8e7c9afc | 2487 | |
fa08c86b | 2488 | /* Initiate forwarding */ |
3867aa0a | 2489 | channel_setup_local_fwd_listener(NULL, port, hostname, |
2490 | host_port, gateway_ports); | |
5260325f | 2491 | |
2492 | /* Free the argument string. */ | |
2493 | xfree(hostname); | |
8efc0c15 | 2494 | } |
2495 | ||
01794848 | 2496 | /* |
2497 | * Permits opening to any host/port if permitted_opens[] is empty. This is | |
2498 | * usually called by the server, because the user could connect to any port | |
2499 | * anyway, and the server has no way to know but to trust the client anyway. | |
2500 | */ | |
2501 | void | |
d5bb9418 | 2502 | channel_permit_all_opens(void) |
01794848 | 2503 | { |
2504 | if (num_permitted_opens == 0) | |
2505 | all_opens_permitted = 1; | |
2506 | } | |
2507 | ||
cd332296 | 2508 | void |
01794848 | 2509 | channel_add_permitted_opens(char *host, int port) |
2510 | { | |
2511 | if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
2512 | fatal("channel_request_remote_forwarding: too many forwards"); | |
2513 | debug("allow port forwarding to host %s port %d", host, port); | |
2514 | ||
2515 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host); | |
2516 | permitted_opens[num_permitted_opens].port_to_connect = port; | |
2517 | num_permitted_opens++; | |
2518 | ||
2519 | all_opens_permitted = 0; | |
2520 | } | |
2521 | ||
cd332296 | 2522 | void |
01794848 | 2523 | channel_clear_permitted_opens(void) |
2524 | { | |
2525 | int i; | |
2526 | ||
2527 | for (i = 0; i < num_permitted_opens; i++) | |
d740ec16 | 2528 | if (permitted_opens[i].host_to_connect != NULL) |
2529 | xfree(permitted_opens[i].host_to_connect); | |
01794848 | 2530 | num_permitted_opens = 0; |
2531 | ||
2532 | } | |
2533 | ||
2534 | ||
2535 | /* return socket to remote host, port */ | |
396c147e | 2536 | static int |
01794848 | 2537 | connect_to(const char *host, u_short port) |
8efc0c15 | 2538 | { |
48e671d5 | 2539 | struct addrinfo hints, *ai, *aitop; |
2540 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; | |
2541 | int gaierr; | |
7368a6c8 | 2542 | int sock = -1; |
48e671d5 | 2543 | |
2544 | memset(&hints, 0, sizeof(hints)); | |
2545 | hints.ai_family = IPv4or6; | |
2546 | hints.ai_socktype = SOCK_STREAM; | |
01794848 | 2547 | snprintf(strport, sizeof strport, "%d", port); |
48e671d5 | 2548 | if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) { |
01794848 | 2549 | error("connect_to %.100s: unknown host (%s)", host, |
2550 | gai_strerror(gaierr)); | |
7368a6c8 | 2551 | return -1; |
48e671d5 | 2552 | } |
48e671d5 | 2553 | for (ai = aitop; ai; ai = ai->ai_next) { |
2554 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
2555 | continue; | |
2556 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), | |
2557 | strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { | |
01794848 | 2558 | error("connect_to: getnameinfo failed"); |
48e671d5 | 2559 | continue; |
5260325f | 2560 | } |
3e131a6d | 2561 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
48e671d5 | 2562 | if (sock < 0) { |
4940c411 | 2563 | if (ai->ai_next == NULL) |
2564 | error("socket: %.100s", strerror(errno)); | |
2565 | else | |
2566 | verbose("socket: %.100s", strerror(errno)); | |
48e671d5 | 2567 | continue; |
5260325f | 2568 | } |
170694d7 | 2569 | if (set_nonblock(sock) == -1) |
2570 | fatal("%s: set_nonblock(%d)", __func__, sock); | |
97fb6912 | 2571 | if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0 && |
2572 | errno != EINPROGRESS) { | |
01794848 | 2573 | error("connect_to %.100s port %s: %.100s", ntop, strport, |
48e671d5 | 2574 | strerror(errno)); |
2575 | close(sock); | |
2b87da3b | 2576 | continue; /* fail -- try next */ |
48e671d5 | 2577 | } |
2578 | break; /* success */ | |
5260325f | 2579 | |
5260325f | 2580 | } |
48e671d5 | 2581 | freeaddrinfo(aitop); |
48e671d5 | 2582 | if (!ai) { |
01794848 | 2583 | error("connect_to %.100s port %d: failed.", host, port); |
7368a6c8 | 2584 | return -1; |
8efc0c15 | 2585 | } |
7368a6c8 | 2586 | /* success */ |
811a6342 | 2587 | set_nodelay(sock); |
7368a6c8 | 2588 | return sock; |
2589 | } | |
01794848 | 2590 | |
fa08c86b | 2591 | int |
b3f8a79c | 2592 | channel_connect_by_listen_address(u_short listen_port) |
fa08c86b | 2593 | { |
2594 | int i; | |
01794848 | 2595 | |
fa08c86b | 2596 | for (i = 0; i < num_permitted_opens; i++) |
d740ec16 | 2597 | if (permitted_opens[i].host_to_connect != NULL && |
2598 | permitted_opens[i].listen_port == listen_port) | |
01794848 | 2599 | return connect_to( |
fa08c86b | 2600 | permitted_opens[i].host_to_connect, |
2601 | permitted_opens[i].port_to_connect); | |
0b6fbf03 | 2602 | error("WARNING: Server requests forwarding for unknown listen_port %d", |
2603 | listen_port); | |
fa08c86b | 2604 | return -1; |
2605 | } | |
48e671d5 | 2606 | |
01794848 | 2607 | /* Check if connecting to that port is permitted and connect. */ |
2608 | int | |
2609 | channel_connect_to(const char *host, u_short port) | |
2610 | { | |
2611 | int i, permit; | |
2612 | ||
2613 | permit = all_opens_permitted; | |
2614 | if (!permit) { | |
2615 | for (i = 0; i < num_permitted_opens; i++) | |
d740ec16 | 2616 | if (permitted_opens[i].host_to_connect != NULL && |
2617 | permitted_opens[i].port_to_connect == port && | |
01794848 | 2618 | strcmp(permitted_opens[i].host_to_connect, host) == 0) |
2619 | permit = 1; | |
2620 | ||
2621 | } | |
2622 | if (!permit) { | |
bbe88b6d | 2623 | logit("Received request to connect to host %.100s port %d, " |
01794848 | 2624 | "but the request was denied.", host, port); |
2625 | return -1; | |
2626 | } | |
2627 | return connect_to(host, port); | |
2628 | } | |
2629 | ||
5e96b616 | 2630 | void |
2631 | channel_send_window_changes(void) | |
2632 | { | |
9a995072 | 2633 | u_int i; |
5e96b616 | 2634 | struct winsize ws; |
2635 | ||
2636 | for (i = 0; i < channels_alloc; i++) { | |
f8cc7664 | 2637 | if (channels[i] == NULL || !channels[i]->client_tty || |
5e96b616 | 2638 | channels[i]->type != SSH_CHANNEL_OPEN) |
2639 | continue; | |
2640 | if (ioctl(channels[i]->rfd, TIOCGWINSZ, &ws) < 0) | |
2641 | continue; | |
2642 | channel_request_start(i, "window-change", 0); | |
2643 | packet_put_int(ws.ws_col); | |
2644 | packet_put_int(ws.ws_row); | |
2645 | packet_put_int(ws.ws_xpixel); | |
2646 | packet_put_int(ws.ws_ypixel); | |
2647 | packet_send(); | |
2648 | } | |
2649 | } | |
2650 | ||
8e7895b8 | 2651 | /* -- X11 forwarding */ |
8efc0c15 | 2652 | |
aa3378df | 2653 | /* |
2654 | * Creates an internet domain socket for listening for X11 connections. | |
57f228e8 | 2655 | * Returns 0 and a suitable display number for the DISPLAY variable |
2656 | * stored in display_numberp , or -1 if an error occurs. | |
aa3378df | 2657 | */ |
c9d0ad9b | 2658 | int |
e6e573bd | 2659 | x11_create_display_inet(int x11_display_offset, int x11_use_localhost, |
57f228e8 | 2660 | int single_connection, u_int *display_numberp) |
8efc0c15 | 2661 | { |
ac151b18 | 2662 | Channel *nc = NULL; |
57112b5a | 2663 | int display_number, sock; |
2664 | u_short port; | |
48e671d5 | 2665 | struct addrinfo hints, *ai, *aitop; |
2666 | char strport[NI_MAXSERV]; | |
2667 | int gaierr, n, num_socks = 0, socks[NUM_SOCKS]; | |
5260325f | 2668 | |
95f1eccc | 2669 | for (display_number = x11_display_offset; |
184eed6a | 2670 | display_number < MAX_DISPLAYS; |
2671 | display_number++) { | |
5260325f | 2672 | port = 6000 + display_number; |
48e671d5 | 2673 | memset(&hints, 0, sizeof(hints)); |
2674 | hints.ai_family = IPv4or6; | |
e6e573bd | 2675 | hints.ai_flags = x11_use_localhost ? 0: AI_PASSIVE; |
48e671d5 | 2676 | hints.ai_socktype = SOCK_STREAM; |
2677 | snprintf(strport, sizeof strport, "%d", port); | |
2678 | if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) { | |
2679 | error("getaddrinfo: %.100s", gai_strerror(gaierr)); | |
c9d0ad9b | 2680 | return -1; |
5260325f | 2681 | } |
48e671d5 | 2682 | for (ai = aitop; ai; ai = ai->ai_next) { |
2683 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
2684 | continue; | |
3e131a6d | 2685 | sock = socket(ai->ai_family, ai->ai_socktype, |
2686 | ai->ai_protocol); | |
48e671d5 | 2687 | if (sock < 0) { |
4ee81249 | 2688 | if ((errno != EINVAL) && (errno != EAFNOSUPPORT)) { |
80a44451 | 2689 | error("socket: %.100s", strerror(errno)); |
0ea89f7e | 2690 | freeaddrinfo(aitop); |
c9d0ad9b | 2691 | return -1; |
80a44451 | 2692 | } else { |
22d89d24 | 2693 | debug("x11_create_display_inet: Socket family %d not supported", |
2694 | ai->ai_family); | |
80a44451 | 2695 | continue; |
2696 | } | |
48e671d5 | 2697 | } |
688aaeda | 2698 | #ifdef IPV6_V6ONLY |
2699 | if (ai->ai_family == AF_INET6) { | |
2700 | int on = 1; | |
2701 | if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) < 0) | |
2702 | error("setsockopt IPV6_V6ONLY: %.100s", strerror(errno)); | |
2703 | } | |
2704 | #endif | |
48e671d5 | 2705 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { |
d7ac5f18 | 2706 | debug2("bind port %d: %.100s", port, strerror(errno)); |
48e671d5 | 2707 | close(sock); |
16218745 | 2708 | |
2709 | if (ai->ai_next) | |
2710 | continue; | |
2711 | ||
48e671d5 | 2712 | for (n = 0; n < num_socks; n++) { |
48e671d5 | 2713 | close(socks[n]); |
2714 | } | |
2715 | num_socks = 0; | |
2716 | break; | |
2717 | } | |
2718 | socks[num_socks++] = sock; | |
80faa19f | 2719 | #ifndef DONT_TRY_OTHER_AF |
48e671d5 | 2720 | if (num_socks == NUM_SOCKS) |
2721 | break; | |
80faa19f | 2722 | #else |
688aaeda | 2723 | if (x11_use_localhost) { |
2724 | if (num_socks == NUM_SOCKS) | |
2725 | break; | |
2726 | } else { | |
2727 | break; | |
2728 | } | |
80faa19f | 2729 | #endif |
5260325f | 2730 | } |
4ccb01d6 | 2731 | freeaddrinfo(aitop); |
48e671d5 | 2732 | if (num_socks > 0) |
2733 | break; | |
5260325f | 2734 | } |
2735 | if (display_number >= MAX_DISPLAYS) { | |
2736 | error("Failed to allocate internet-domain X11 display socket."); | |
c9d0ad9b | 2737 | return -1; |
8efc0c15 | 2738 | } |
5260325f | 2739 | /* Start listening for connections on the socket. */ |
48e671d5 | 2740 | for (n = 0; n < num_socks; n++) { |
2741 | sock = socks[n]; | |
fce39749 | 2742 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { |
48e671d5 | 2743 | error("listen: %.100s", strerror(errno)); |
48e671d5 | 2744 | close(sock); |
c9d0ad9b | 2745 | return -1; |
a7effaac | 2746 | } |
a7effaac | 2747 | } |
5260325f | 2748 | |
48e671d5 | 2749 | /* Allocate a channel for each socket. */ |
2750 | for (n = 0; n < num_socks; n++) { | |
2751 | sock = socks[n]; | |
ac151b18 | 2752 | nc = channel_new("x11 listener", |
0b242b12 | 2753 | SSH_CHANNEL_X11_LISTENER, sock, sock, -1, |
2754 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, | |
0d942eff | 2755 | 0, "X11 inet listener", 1); |
3a0d3d54 | 2756 | nc->single_connection = single_connection; |
48e671d5 | 2757 | } |
5260325f | 2758 | |
c9d0ad9b | 2759 | /* Return the display number for the DISPLAY environment variable. */ |
57f228e8 | 2760 | *display_numberp = display_number; |
2761 | return (0); | |
8efc0c15 | 2762 | } |
2763 | ||
396c147e | 2764 | static int |
1e3b8b07 | 2765 | connect_local_xsocket(u_int dnr) |
8efc0c15 | 2766 | { |
5260325f | 2767 | int sock; |
2768 | struct sockaddr_un addr; | |
5260325f | 2769 | |
805e659f | 2770 | sock = socket(AF_UNIX, SOCK_STREAM, 0); |
2771 | if (sock < 0) | |
2772 | error("socket: %.100s", strerror(errno)); | |
2773 | memset(&addr, 0, sizeof(addr)); | |
2774 | addr.sun_family = AF_UNIX; | |
2775 | snprintf(addr.sun_path, sizeof addr.sun_path, _PATH_UNIX_X, dnr); | |
2776 | if (connect(sock, (struct sockaddr *) & addr, sizeof(addr)) == 0) | |
2777 | return sock; | |
2778 | close(sock); | |
5260325f | 2779 | error("connect %.100s: %.100s", addr.sun_path, strerror(errno)); |
2780 | return -1; | |
8efc0c15 | 2781 | } |
2782 | ||
0b242b12 | 2783 | int |
2784 | x11_connect_display(void) | |
8efc0c15 | 2785 | { |
bcc0381e | 2786 | int display_number, sock = 0; |
5260325f | 2787 | const char *display; |
0b242b12 | 2788 | char buf[1024], *cp; |
48e671d5 | 2789 | struct addrinfo hints, *ai, *aitop; |
2790 | char strport[NI_MAXSERV]; | |
2791 | int gaierr; | |
5260325f | 2792 | |
5260325f | 2793 | /* Try to open a socket for the local X server. */ |
2794 | display = getenv("DISPLAY"); | |
2795 | if (!display) { | |
2796 | error("DISPLAY not set."); | |
0b242b12 | 2797 | return -1; |
5260325f | 2798 | } |
aa3378df | 2799 | /* |
2800 | * Now we decode the value of the DISPLAY variable and make a | |
2801 | * connection to the real X server. | |
2802 | */ | |
2803 | ||
2804 | /* | |
2805 | * Check if it is a unix domain socket. Unix domain displays are in | |
2806 | * one of the following formats: unix:d[.s], :d[.s], ::d[.s] | |
2807 | */ | |
5260325f | 2808 | if (strncmp(display, "unix:", 5) == 0 || |
2809 | display[0] == ':') { | |
2810 | /* Connect to the unix domain socket. */ | |
2811 | if (sscanf(strrchr(display, ':') + 1, "%d", &display_number) != 1) { | |
2812 | error("Could not parse display number from DISPLAY: %.100s", | |
184eed6a | 2813 | display); |
0b242b12 | 2814 | return -1; |
5260325f | 2815 | } |
2816 | /* Create a socket. */ | |
2817 | sock = connect_local_xsocket(display_number); | |
2818 | if (sock < 0) | |
0b242b12 | 2819 | return -1; |
5260325f | 2820 | |
2821 | /* OK, we now have a connection to the display. */ | |
0b242b12 | 2822 | return sock; |
5260325f | 2823 | } |
aa3378df | 2824 | /* |
2825 | * Connect to an inet socket. The DISPLAY value is supposedly | |
2826 | * hostname:d[.s], where hostname may also be numeric IP address. | |
2827 | */ | |
74860245 | 2828 | strlcpy(buf, display, sizeof(buf)); |
5260325f | 2829 | cp = strchr(buf, ':'); |
2830 | if (!cp) { | |
2831 | error("Could not find ':' in DISPLAY: %.100s", display); | |
0b242b12 | 2832 | return -1; |
5260325f | 2833 | } |
2834 | *cp = 0; | |
aa3378df | 2835 | /* buf now contains the host name. But first we parse the display number. */ |
5260325f | 2836 | if (sscanf(cp + 1, "%d", &display_number) != 1) { |
2837 | error("Could not parse display number from DISPLAY: %.100s", | |
184eed6a | 2838 | display); |
0b242b12 | 2839 | return -1; |
5260325f | 2840 | } |
5260325f | 2841 | |
48e671d5 | 2842 | /* Look up the host address */ |
2843 | memset(&hints, 0, sizeof(hints)); | |
2844 | hints.ai_family = IPv4or6; | |
2845 | hints.ai_socktype = SOCK_STREAM; | |
2846 | snprintf(strport, sizeof strport, "%d", 6000 + display_number); | |
2847 | if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) { | |
2848 | error("%.100s: unknown host. (%s)", buf, gai_strerror(gaierr)); | |
0b242b12 | 2849 | return -1; |
8efc0c15 | 2850 | } |
48e671d5 | 2851 | for (ai = aitop; ai; ai = ai->ai_next) { |
2852 | /* Create a socket. */ | |
3e131a6d | 2853 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
48e671d5 | 2854 | if (sock < 0) { |
d7ac5f18 | 2855 | debug2("socket: %.100s", strerror(errno)); |
7368a6c8 | 2856 | continue; |
2857 | } | |
2858 | /* Connect it to the display. */ | |
2859 | if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) { | |
d7ac5f18 | 2860 | debug2("connect %.100s port %d: %.100s", buf, |
7368a6c8 | 2861 | 6000 + display_number, strerror(errno)); |
2862 | close(sock); | |
2863 | continue; | |
2864 | } | |
2865 | /* Success */ | |
2866 | break; | |
48e671d5 | 2867 | } |
48e671d5 | 2868 | freeaddrinfo(aitop); |
2869 | if (!ai) { | |
6ae2364d | 2870 | error("connect %.100s port %d: %.100s", buf, 6000 + display_number, |
48e671d5 | 2871 | strerror(errno)); |
0b242b12 | 2872 | return -1; |
8efc0c15 | 2873 | } |
bcc0381e | 2874 | set_nodelay(sock); |
0b242b12 | 2875 | return sock; |
2876 | } | |
5260325f | 2877 | |
0b242b12 | 2878 | /* |
2879 | * This is called when SSH_SMSG_X11_OPEN is received. The packet contains | |
2880 | * the remote channel number. We should do whatever we want, and respond | |
2881 | * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE. | |
2882 | */ | |
5260325f | 2883 | |
0b242b12 | 2884 | void |
7819b5c3 | 2885 | x11_input_open(int type, u_int32_t seq, void *ctxt) |
0b242b12 | 2886 | { |
719fc62f | 2887 | Channel *c = NULL; |
2888 | int remote_id, sock = 0; | |
0b242b12 | 2889 | char *remote_host; |
5260325f | 2890 | |
719fc62f | 2891 | debug("Received X11 open request."); |
5260325f | 2892 | |
719fc62f | 2893 | remote_id = packet_get_int(); |
8e7895b8 | 2894 | |
2895 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) { | |
719fc62f | 2896 | remote_host = packet_get_string(NULL); |
0b242b12 | 2897 | } else { |
2898 | remote_host = xstrdup("unknown (remote did not supply name)"); | |
0b242b12 | 2899 | } |
95500969 | 2900 | packet_check_eom(); |
0b242b12 | 2901 | |
2902 | /* Obtain a connection to the real X display. */ | |
2903 | sock = x11_connect_display(); | |
719fc62f | 2904 | if (sock != -1) { |
2905 | /* Allocate a channel for this connection. */ | |
2906 | c = channel_new("connected x11 socket", | |
2907 | SSH_CHANNEL_X11_OPEN, sock, sock, -1, 0, 0, 0, | |
2908 | remote_host, 1); | |
3a0d3d54 | 2909 | c->remote_id = remote_id; |
2910 | c->force_drain = 1; | |
719fc62f | 2911 | } |
0d942eff | 2912 | xfree(remote_host); |
719fc62f | 2913 | if (c == NULL) { |
0b242b12 | 2914 | /* Send refusal to the remote host. */ |
2915 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
719fc62f | 2916 | packet_put_int(remote_id); |
0b242b12 | 2917 | } else { |
0b242b12 | 2918 | /* Send a confirmation to the remote host. */ |
2919 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
719fc62f | 2920 | packet_put_int(remote_id); |
2921 | packet_put_int(c->self); | |
0b242b12 | 2922 | } |
719fc62f | 2923 | packet_send(); |
8efc0c15 | 2924 | } |
2925 | ||
a22aff1f | 2926 | /* dummy protocol handler that denies SSH-1 requests (agent/x11) */ |
2927 | void | |
7819b5c3 | 2928 | deny_input_open(int type, u_int32_t seq, void *ctxt) |
a22aff1f | 2929 | { |
2930 | int rchan = packet_get_int(); | |
e1feb9bf | 2931 | |
6aacefa7 | 2932 | switch (type) { |
a22aff1f | 2933 | case SSH_SMSG_AGENT_OPEN: |
2934 | error("Warning: ssh server tried agent forwarding."); | |
2935 | break; | |
2936 | case SSH_SMSG_X11_OPEN: | |
2937 | error("Warning: ssh server tried X11 forwarding."); | |
2938 | break; | |
2939 | default: | |
7819b5c3 | 2940 | error("deny_input_open: type %d", type); |
a22aff1f | 2941 | break; |
2942 | } | |
2943 | error("Warning: this is probably a break in attempt by a malicious server."); | |
2944 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
2945 | packet_put_int(rchan); | |
2946 | packet_send(); | |
2947 | } | |
2948 | ||
aa3378df | 2949 | /* |
2950 | * Requests forwarding of X11 connections, generates fake authentication | |
2951 | * data, and enables authentication spoofing. | |
8e7895b8 | 2952 | * This should be called in the client only. |
aa3378df | 2953 | */ |
6ae2364d | 2954 | void |
0b242b12 | 2955 | x11_request_forwarding_with_spoofing(int client_session_id, |
2956 | const char *proto, const char *data) | |
8efc0c15 | 2957 | { |
1e3b8b07 | 2958 | u_int data_len = (u_int) strlen(data) / 2; |
ca910e13 | 2959 | u_int i, value, len; |
5260325f | 2960 | char *new_data; |
2961 | int screen_number; | |
2962 | const char *cp; | |
ca75d7de | 2963 | u_int32_t rnd = 0; |
5260325f | 2964 | |
2965 | cp = getenv("DISPLAY"); | |
2966 | if (cp) | |
2967 | cp = strchr(cp, ':'); | |
2968 | if (cp) | |
2969 | cp = strchr(cp, '.'); | |
2970 | if (cp) | |
2971 | screen_number = atoi(cp + 1); | |
2972 | else | |
2973 | screen_number = 0; | |
2974 | ||
2975 | /* Save protocol name. */ | |
2976 | x11_saved_proto = xstrdup(proto); | |
2977 | ||
aa3378df | 2978 | /* |
2979 | * Extract real authentication data and generate fake data of the | |
2980 | * same length. | |
2981 | */ | |
5260325f | 2982 | x11_saved_data = xmalloc(data_len); |
2983 | x11_fake_data = xmalloc(data_len); | |
2984 | for (i = 0; i < data_len; i++) { | |
2985 | if (sscanf(data + 2 * i, "%2x", &value) != 1) | |
2986 | fatal("x11_request_forwarding: bad authentication data: %.100s", data); | |
2987 | if (i % 4 == 0) | |
ca75d7de | 2988 | rnd = arc4random(); |
5260325f | 2989 | x11_saved_data[i] = value; |
ca75d7de | 2990 | x11_fake_data[i] = rnd & 0xff; |
2991 | rnd >>= 8; | |
5260325f | 2992 | } |
2993 | x11_saved_data_len = data_len; | |
2994 | x11_fake_data_len = data_len; | |
2995 | ||
2996 | /* Convert the fake data into hex. */ | |
ca910e13 | 2997 | len = 2 * data_len + 1; |
2998 | new_data = xmalloc(len); | |
5260325f | 2999 | for (i = 0; i < data_len; i++) |
ca910e13 | 3000 | snprintf(new_data + 2 * i, len - 2 * i, |
3001 | "%02x", (u_char) x11_fake_data[i]); | |
5260325f | 3002 | |
3003 | /* Send the request packet. */ | |
0b242b12 | 3004 | if (compat20) { |
3005 | channel_request_start(client_session_id, "x11-req", 0); | |
3006 | packet_put_char(0); /* XXX bool single connection */ | |
3007 | } else { | |
3008 | packet_start(SSH_CMSG_X11_REQUEST_FORWARDING); | |
3009 | } | |
3010 | packet_put_cstring(proto); | |
3011 | packet_put_cstring(new_data); | |
5260325f | 3012 | packet_put_int(screen_number); |
3013 | packet_send(); | |
3014 | packet_write_wait(); | |
3015 | xfree(new_data); | |
8efc0c15 | 3016 | } |
3017 | ||
8e7895b8 | 3018 | |
3019 | /* -- agent forwarding */ | |
3020 | ||
8efc0c15 | 3021 | /* Sends a message to the server to request authentication fd forwarding. */ |
3022 | ||
6ae2364d | 3023 | void |
d5bb9418 | 3024 | auth_request_forwarding(void) |
8efc0c15 | 3025 | { |
5260325f | 3026 | packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING); |
3027 | packet_send(); | |
3028 | packet_write_wait(); | |
8efc0c15 | 3029 | } |