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