]>
Commit | Line | Data |
---|---|---|
c8dfff33 | 1 | /* $OpenBSD: channels.c,v 1.255 2006/07/12 22:28:51 stevesk Exp $ */ |
8efc0c15 | 2 | /* |
5260325f | 3 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
5260325f | 4 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
5 | * All rights reserved | |
5260325f | 6 | * This file contains functions for generic socket connection forwarding. |
7 | * There is also code for initiating connection forwarding for X11 connections, | |
8 | * arbitrary tcp/ip connections, and the authentication agent connection. | |
6ae2364d | 9 | * |
bcbf86ec | 10 | * As far as I am concerned, the code I have written for this software |
11 | * can be used freely for any purpose. Any derived versions of this | |
12 | * software must be clearly marked as such, and if the derived work is | |
13 | * incompatible with the protocol description in the RFC file, it must be | |
14 | * called by a name other than "ssh" or "Secure Shell". | |
15 | * | |
7e7327a1 | 16 | * SSH2 support added by Markus Friedl. |
8341f420 | 17 | * Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved. |
bcbf86ec | 18 | * Copyright (c) 1999 Dug Song. All rights reserved. |
19 | * Copyright (c) 1999 Theo de Raadt. All rights reserved. | |
20 | * | |
21 | * Redistribution and use in source and binary forms, with or without | |
22 | * modification, are permitted provided that the following conditions | |
23 | * are met: | |
24 | * 1. Redistributions of source code must retain the above copyright | |
25 | * notice, this list of conditions and the following disclaimer. | |
26 | * 2. Redistributions in binary form must reproduce the above copyright | |
27 | * notice, this list of conditions and the following disclaimer in the | |
28 | * documentation and/or other materials provided with the distribution. | |
29 | * | |
30 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
31 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
32 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
33 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
34 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
35 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
36 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
37 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
38 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
39 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
5260325f | 40 | */ |
8efc0c15 | 41 | |
42 | #include "includes.h" | |
bd7c69ea | 43 | |
44 | #include <sys/ioctl.h> | |
cebb4c24 | 45 | #include <sys/types.h> |
46 | #include <sys/un.h> | |
319d6b41 | 47 | #include <sys/socket.h> |
48 | ||
49 | #include <netinet/in.h> | |
50 | #include <arpa/inet.h> | |
1d3e026f | 51 | |
028094f4 | 52 | #include <errno.h> |
c8dfff33 | 53 | #if defined(HAVE_NETDB_H) |
54 | # include <netdb.h> | |
55 | #endif | |
1d3e026f | 56 | #include <termios.h> |
8efc0c15 | 57 | |
58 | #include "ssh.h" | |
42f11eb2 | 59 | #include "ssh1.h" |
60 | #include "ssh2.h" | |
8efc0c15 | 61 | #include "packet.h" |
62 | #include "xmalloc.h" | |
42f11eb2 | 63 | #include "log.h" |
64 | #include "misc.h" | |
8efc0c15 | 65 | #include "channels.h" |
8efc0c15 | 66 | #include "compat.h" |
42f11eb2 | 67 | #include "canohost.h" |
4c8722d9 | 68 | #include "key.h" |
69 | #include "authfd.h" | |
805e659f | 70 | #include "pathnames.h" |
f49658f5 | 71 | #include "bufaux.h" |
8efc0c15 | 72 | |
8e7895b8 | 73 | /* -- channel core */ |
8efc0c15 | 74 | |
aa3378df | 75 | /* |
76 | * Pointer to an array containing all allocated channels. The array is | |
77 | * dynamically extended as needed. | |
78 | */ | |
719fc62f | 79 | static Channel **channels = NULL; |
8efc0c15 | 80 | |
aa3378df | 81 | /* |
82 | * Size of the channel array. All slots of the array must always be | |
719fc62f | 83 | * initialized (at least the type field); unused slots set to NULL |
aa3378df | 84 | */ |
9a995072 | 85 | static u_int channels_alloc = 0; |
8efc0c15 | 86 | |
aa3378df | 87 | /* |
88 | * Maximum file descriptor value used in any of the channels. This is | |
719fc62f | 89 | * updated in channel_new. |
aa3378df | 90 | */ |
39929cdb | 91 | static int channel_max_fd = 0; |
8efc0c15 | 92 | |
8efc0c15 | 93 | |
8e7895b8 | 94 | /* -- tcp forwarding */ |
8efc0c15 | 95 | |
aa3378df | 96 | /* |
97 | * Data structure for storing which hosts are permitted for forward requests. | |
98 | * The local sides of any remote forwards are stored in this array to prevent | |
99 | * a corrupt remote server from accessing arbitrary TCP/IP ports on our local | |
100 | * network (which might be behind a firewall). | |
101 | */ | |
5260325f | 102 | typedef struct { |
7368a6c8 | 103 | char *host_to_connect; /* Connect to 'host'. */ |
104 | u_short port_to_connect; /* Connect to 'port'. */ | |
105 | u_short listen_port; /* Remote side should listen port number. */ | |
8efc0c15 | 106 | } ForwardPermission; |
107 | ||
108 | /* List of all permitted host/port pairs to connect. */ | |
109 | static ForwardPermission permitted_opens[SSH_MAX_FORWARDS_PER_DIRECTION]; | |
8e7895b8 | 110 | |
8efc0c15 | 111 | /* Number of permitted host/port pairs in the array. */ |
112 | static int num_permitted_opens = 0; | |
aa3378df | 113 | /* |
114 | * If this is true, all opens are permitted. This is the case on the server | |
115 | * on which we have to trust the client anyway, and the user could do | |
116 | * anything after logging in anyway. | |
117 | */ | |
8efc0c15 | 118 | static int all_opens_permitted = 0; |
119 | ||
8efc0c15 | 120 | |
8e7895b8 | 121 | /* -- X11 forwarding */ |
42f11eb2 | 122 | |
8e7895b8 | 123 | /* Maximum number of fake X11 displays to try. */ |
124 | #define MAX_DISPLAYS 1000 | |
0490e609 | 125 | |
ef07103c | 126 | /* Saved X11 local (client) display. */ |
127 | static char *x11_saved_display = NULL; | |
128 | ||
8e7895b8 | 129 | /* Saved X11 authentication protocol name. */ |
130 | static char *x11_saved_proto = NULL; | |
8efc0c15 | 131 | |
8e7895b8 | 132 | /* Saved X11 authentication data. This is the real data. */ |
133 | static char *x11_saved_data = NULL; | |
134 | static u_int x11_saved_data_len = 0; | |
135 | ||
136 | /* | |
137 | * Fake X11 authentication data. This is what the server will be sending us; | |
138 | * we should replace any occurrences of this by the real data. | |
139 | */ | |
338eb2ab | 140 | static u_char *x11_fake_data = NULL; |
8e7895b8 | 141 | static u_int x11_fake_data_len; |
142 | ||
143 | ||
144 | /* -- agent forwarding */ | |
8efc0c15 | 145 | |
8e7895b8 | 146 | #define NUM_SOCKS 10 |
147 | ||
8e7895b8 | 148 | /* AF_UNSPEC or AF_INET or AF_INET6 */ |
5e4a7219 | 149 | static int IPv4or6 = AF_UNSPEC; |
8e7895b8 | 150 | |
151 | /* helper */ | |
396c147e | 152 | static void port_open_helper(Channel *c, char *rtype); |
8e7895b8 | 153 | |
154 | /* -- channel core */ | |
7368a6c8 | 155 | |
156 | Channel * | |
b872f7f0 | 157 | channel_by_id(int id) |
7368a6c8 | 158 | { |
159 | Channel *c; | |
719fc62f | 160 | |
9a995072 | 161 | if (id < 0 || (u_int)id >= channels_alloc) { |
b872f7f0 | 162 | logit("channel_by_id: %d: bad id", id); |
7368a6c8 | 163 | return NULL; |
164 | } | |
719fc62f | 165 | c = channels[id]; |
166 | if (c == NULL) { | |
b872f7f0 | 167 | logit("channel_by_id: %d: bad id: channel free", id); |
7368a6c8 | 168 | return NULL; |
169 | } | |
170 | return c; | |
171 | } | |
172 | ||
b872f7f0 | 173 | /* |
174 | * Returns the channel if it is allowed to receive protocol messages. | |
175 | * Private channels, like listening sockets, may not receive messages. | |
176 | */ | |
177 | Channel * | |
178 | channel_lookup(int id) | |
179 | { | |
180 | Channel *c; | |
181 | ||
182 | if ((c = channel_by_id(id)) == NULL) | |
183 | return (NULL); | |
184 | ||
c8e9c167 | 185 | switch (c->type) { |
b872f7f0 | 186 | case SSH_CHANNEL_X11_OPEN: |
187 | case SSH_CHANNEL_LARVAL: | |
188 | case SSH_CHANNEL_CONNECTING: | |
189 | case SSH_CHANNEL_DYNAMIC: | |
190 | case SSH_CHANNEL_OPENING: | |
191 | case SSH_CHANNEL_OPEN: | |
192 | case SSH_CHANNEL_INPUT_DRAINING: | |
193 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
194 | return (c); | |
b872f7f0 | 195 | } |
196 | logit("Non-public channel %d, type %d.", id, c->type); | |
197 | return (NULL); | |
198 | } | |
199 | ||
aa3378df | 200 | /* |
1d1ffb87 | 201 | * Register filedescriptors for a channel, used when allocating a channel or |
0fbe8c74 | 202 | * when the channel consumer/producer is ready, e.g. shell exec'd |
aa3378df | 203 | */ |
396c147e | 204 | static void |
a22aff1f | 205 | channel_register_fds(Channel *c, int rfd, int wfd, int efd, |
206 | int extusage, int nonblock) | |
8efc0c15 | 207 | { |
5260325f | 208 | /* Update the maximum file descriptor value. */ |
39929cdb | 209 | channel_max_fd = MAX(channel_max_fd, rfd); |
210 | channel_max_fd = MAX(channel_max_fd, wfd); | |
211 | channel_max_fd = MAX(channel_max_fd, efd); | |
212 | ||
aa3378df | 213 | /* XXX set close-on-exec -markus */ |
1d1ffb87 | 214 | |
0fbe8c74 | 215 | c->rfd = rfd; |
216 | c->wfd = wfd; | |
217 | c->sock = (rfd == wfd) ? rfd : -1; | |
5e96b616 | 218 | c->ctl_fd = -1; /* XXX: set elsewhere */ |
0fbe8c74 | 219 | c->efd = efd; |
220 | c->extended_usage = extusage; | |
a22aff1f | 221 | |
0ae4fe1d | 222 | /* XXX ugly hack: nonblock is only set by the server */ |
223 | if (nonblock && isatty(c->rfd)) { | |
d7ac5f18 | 224 | debug2("channel %d: rfd %d isatty", c->self, c->rfd); |
0ae4fe1d | 225 | c->isatty = 1; |
226 | if (!isatty(c->wfd)) { | |
94dfb550 | 227 | error("channel %d: wfd %d is not a tty?", |
0ae4fe1d | 228 | c->self, c->wfd); |
229 | } | |
230 | } else { | |
231 | c->isatty = 0; | |
232 | } | |
21c2c5cd | 233 | c->wfd_isatty = isatty(c->wfd); |
0ae4fe1d | 234 | |
a22aff1f | 235 | /* enable nonblocking mode */ |
236 | if (nonblock) { | |
237 | if (rfd != -1) | |
238 | set_nonblock(rfd); | |
239 | if (wfd != -1) | |
240 | set_nonblock(wfd); | |
241 | if (efd != -1) | |
242 | set_nonblock(efd); | |
243 | } | |
0fbe8c74 | 244 | } |
245 | ||
246 | /* | |
247 | * Allocate a new channel object and set its type and socket. This will cause | |
248 | * remote_name to be freed. | |
249 | */ | |
719fc62f | 250 | Channel * |
0fbe8c74 | 251 | channel_new(char *ctype, int type, int rfd, int wfd, int efd, |
f91d9a89 | 252 | u_int window, u_int maxpack, int extusage, char *remote_name, int nonblock) |
0fbe8c74 | 253 | { |
9a995072 | 254 | int found; |
255 | u_int i; | |
0fbe8c74 | 256 | Channel *c; |
5260325f | 257 | |
258 | /* Do initial allocation if this is the first call. */ | |
259 | if (channels_alloc == 0) { | |
260 | channels_alloc = 10; | |
52e3daed | 261 | channels = xcalloc(channels_alloc, sizeof(Channel *)); |
5260325f | 262 | for (i = 0; i < channels_alloc; i++) |
719fc62f | 263 | channels[i] = NULL; |
5260325f | 264 | } |
265 | /* Try to find a free slot where to put the new channel. */ | |
266 | for (found = -1, i = 0; i < channels_alloc; i++) | |
719fc62f | 267 | if (channels[i] == NULL) { |
5260325f | 268 | /* Found a free slot. */ |
9a995072 | 269 | found = (int)i; |
5260325f | 270 | break; |
271 | } | |
9a995072 | 272 | if (found < 0) { |
aa3378df | 273 | /* There are no free slots. Take last+1 slot and expand the array. */ |
5260325f | 274 | found = channels_alloc; |
5df8c731 | 275 | if (channels_alloc > 10000) |
276 | fatal("channel_new: internal error: channels_alloc %d " | |
277 | "too big.", channels_alloc); | |
c5d10563 | 278 | channels = xrealloc(channels, channels_alloc + 10, |
279 | sizeof(Channel *)); | |
20419cc1 | 280 | channels_alloc += 10; |
de273eef | 281 | debug2("channel: expanding %d", channels_alloc); |
5260325f | 282 | for (i = found; i < channels_alloc; i++) |
719fc62f | 283 | channels[i] = NULL; |
5260325f | 284 | } |
719fc62f | 285 | /* Initialize and return new channel. */ |
52e3daed | 286 | c = channels[found] = xcalloc(1, sizeof(Channel)); |
5260325f | 287 | buffer_init(&c->input); |
288 | buffer_init(&c->output); | |
7368a6c8 | 289 | buffer_init(&c->extended); |
70bef40e | 290 | c->ostate = CHAN_OUTPUT_OPEN; |
291 | c->istate = CHAN_INPUT_OPEN; | |
292 | c->flags = 0; | |
a22aff1f | 293 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock); |
5260325f | 294 | c->self = found; |
295 | c->type = type; | |
7368a6c8 | 296 | c->ctype = ctype; |
0b242b12 | 297 | c->local_window = window; |
298 | c->local_window_max = window; | |
299 | c->local_consumed = 0; | |
300 | c->local_maxpacket = maxpack; | |
5260325f | 301 | c->remote_id = -1; |
0d942eff | 302 | c->remote_name = xstrdup(remote_name); |
7368a6c8 | 303 | c->remote_window = 0; |
304 | c->remote_maxpacket = 0; | |
a5f82435 | 305 | c->force_drain = 0; |
ac151b18 | 306 | c->single_connection = 0; |
3cf2be58 | 307 | c->detach_user = NULL; |
8cd0437d | 308 | c->detach_close = 0; |
05ca0898 | 309 | c->confirm = NULL; |
5e96b616 | 310 | c->confirm_ctx = NULL; |
2e73a022 | 311 | c->input_filter = NULL; |
c1c6a032 | 312 | c->output_filter = NULL; |
5260325f | 313 | debug("channel %d: new [%s]", found, remote_name); |
719fc62f | 314 | return c; |
7368a6c8 | 315 | } |
8efc0c15 | 316 | |
489aa2e9 | 317 | static int |
318 | channel_find_maxfd(void) | |
319 | { | |
9a995072 | 320 | u_int i; |
321 | int max = 0; | |
489aa2e9 | 322 | Channel *c; |
323 | ||
324 | for (i = 0; i < channels_alloc; i++) { | |
325 | c = channels[i]; | |
326 | if (c != NULL) { | |
327 | max = MAX(max, c->rfd); | |
328 | max = MAX(max, c->wfd); | |
329 | max = MAX(max, c->efd); | |
330 | } | |
331 | } | |
332 | return max; | |
333 | } | |
334 | ||
335 | int | |
336 | channel_close_fd(int *fdp) | |
337 | { | |
338 | int ret = 0, fd = *fdp; | |
339 | ||
340 | if (fd != -1) { | |
341 | ret = close(fd); | |
342 | *fdp = -1; | |
343 | if (fd == channel_max_fd) | |
344 | channel_max_fd = channel_find_maxfd(); | |
345 | } | |
346 | return ret; | |
347 | } | |
348 | ||
0fbe8c74 | 349 | /* Close all channel fd/socket. */ |
396c147e | 350 | static void |
0fbe8c74 | 351 | channel_close_fds(Channel *c) |
352 | { | |
5e96b616 | 353 | debug3("channel %d: close_fds r %d w %d e %d c %d", |
354 | c->self, c->rfd, c->wfd, c->efd, c->ctl_fd); | |
6fd8622b | 355 | |
489aa2e9 | 356 | channel_close_fd(&c->sock); |
5e96b616 | 357 | channel_close_fd(&c->ctl_fd); |
489aa2e9 | 358 | channel_close_fd(&c->rfd); |
359 | channel_close_fd(&c->wfd); | |
360 | channel_close_fd(&c->efd); | |
0fbe8c74 | 361 | } |
362 | ||
8e7895b8 | 363 | /* Free the channel and close its fd/socket. */ |
8e7895b8 | 364 | void |
365 | channel_free(Channel *c) | |
366 | { | |
367 | char *s; | |
9a995072 | 368 | u_int i, n; |
8e7895b8 | 369 | |
370 | for (n = 0, i = 0; i < channels_alloc; i++) | |
371 | if (channels[i]) | |
372 | n++; | |
9a995072 | 373 | debug("channel %d: free: %s, nchannels %u", c->self, |
8e7895b8 | 374 | c->remote_name ? c->remote_name : "???", n); |
375 | ||
376 | s = channel_open_message(); | |
d7ac5f18 | 377 | debug3("channel %d: status: %s", c->self, s); |
8e7895b8 | 378 | xfree(s); |
379 | ||
8e7895b8 | 380 | if (c->sock != -1) |
381 | shutdown(c->sock, SHUT_RDWR); | |
5e96b616 | 382 | if (c->ctl_fd != -1) |
383 | shutdown(c->ctl_fd, SHUT_RDWR); | |
8e7895b8 | 384 | channel_close_fds(c); |
385 | buffer_free(&c->input); | |
386 | buffer_free(&c->output); | |
387 | buffer_free(&c->extended); | |
388 | if (c->remote_name) { | |
389 | xfree(c->remote_name); | |
390 | c->remote_name = NULL; | |
391 | } | |
392 | channels[c->self] = NULL; | |
393 | xfree(c); | |
394 | } | |
395 | ||
8e7895b8 | 396 | void |
d6746a0b | 397 | channel_free_all(void) |
8e7895b8 | 398 | { |
9a995072 | 399 | u_int i; |
8e7895b8 | 400 | |
d6746a0b | 401 | for (i = 0; i < channels_alloc; i++) |
402 | if (channels[i] != NULL) | |
403 | channel_free(channels[i]); | |
8e7895b8 | 404 | } |
405 | ||
406 | /* | |
407 | * Closes the sockets/fds of all channels. This is used to close extra file | |
408 | * descriptors after a fork. | |
409 | */ | |
8e7895b8 | 410 | void |
d5bb9418 | 411 | channel_close_all(void) |
8e7895b8 | 412 | { |
9a995072 | 413 | u_int i; |
8e7895b8 | 414 | |
415 | for (i = 0; i < channels_alloc; i++) | |
416 | if (channels[i] != NULL) | |
417 | channel_close_fds(channels[i]); | |
418 | } | |
419 | ||
3cf2be58 | 420 | /* |
421 | * Stop listening to channels. | |
422 | */ | |
3cf2be58 | 423 | void |
424 | channel_stop_listening(void) | |
425 | { | |
9a995072 | 426 | u_int i; |
3cf2be58 | 427 | Channel *c; |
428 | ||
429 | for (i = 0; i < channels_alloc; i++) { | |
430 | c = channels[i]; | |
431 | if (c != NULL) { | |
432 | switch (c->type) { | |
433 | case SSH_CHANNEL_AUTH_SOCKET: | |
434 | case SSH_CHANNEL_PORT_LISTENER: | |
435 | case SSH_CHANNEL_RPORT_LISTENER: | |
436 | case SSH_CHANNEL_X11_LISTENER: | |
489aa2e9 | 437 | channel_close_fd(&c->sock); |
3cf2be58 | 438 | channel_free(c); |
439 | break; | |
440 | } | |
441 | } | |
442 | } | |
443 | } | |
444 | ||
8e7895b8 | 445 | /* |
446 | * Returns true if no channel has too much buffered data, and false if one or | |
447 | * more channel is overfull. | |
448 | */ | |
8e7895b8 | 449 | int |
d5bb9418 | 450 | channel_not_very_much_buffered_data(void) |
8e7895b8 | 451 | { |
452 | u_int i; | |
453 | Channel *c; | |
454 | ||
455 | for (i = 0; i < channels_alloc; i++) { | |
456 | c = channels[i]; | |
457 | if (c != NULL && c->type == SSH_CHANNEL_OPEN) { | |
0c139bd1 | 458 | #if 0 |
459 | if (!compat20 && | |
460 | buffer_len(&c->input) > packet_get_maxsize()) { | |
faa483fa | 461 | debug2("channel %d: big input buffer %d", |
8e7895b8 | 462 | c->self, buffer_len(&c->input)); |
463 | return 0; | |
464 | } | |
0c139bd1 | 465 | #endif |
8e7895b8 | 466 | if (buffer_len(&c->output) > packet_get_maxsize()) { |
a27002e5 | 467 | debug2("channel %d: big output buffer %u > %u", |
0c139bd1 | 468 | c->self, buffer_len(&c->output), |
469 | packet_get_maxsize()); | |
8e7895b8 | 470 | return 0; |
471 | } | |
472 | } | |
473 | } | |
474 | return 1; | |
475 | } | |
476 | ||
477 | /* Returns true if any channel is still open. */ | |
8e7895b8 | 478 | int |
d5bb9418 | 479 | channel_still_open(void) |
8e7895b8 | 480 | { |
9a995072 | 481 | u_int i; |
8e7895b8 | 482 | Channel *c; |
483 | ||
484 | for (i = 0; i < channels_alloc; i++) { | |
485 | c = channels[i]; | |
486 | if (c == NULL) | |
487 | continue; | |
488 | switch (c->type) { | |
489 | case SSH_CHANNEL_X11_LISTENER: | |
490 | case SSH_CHANNEL_PORT_LISTENER: | |
491 | case SSH_CHANNEL_RPORT_LISTENER: | |
492 | case SSH_CHANNEL_CLOSED: | |
493 | case SSH_CHANNEL_AUTH_SOCKET: | |
494 | case SSH_CHANNEL_DYNAMIC: | |
495 | case SSH_CHANNEL_CONNECTING: | |
496 | case SSH_CHANNEL_ZOMBIE: | |
497 | continue; | |
498 | case SSH_CHANNEL_LARVAL: | |
499 | if (!compat20) | |
500 | fatal("cannot happen: SSH_CHANNEL_LARVAL"); | |
501 | continue; | |
502 | case SSH_CHANNEL_OPENING: | |
503 | case SSH_CHANNEL_OPEN: | |
504 | case SSH_CHANNEL_X11_OPEN: | |
505 | return 1; | |
506 | case SSH_CHANNEL_INPUT_DRAINING: | |
507 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
508 | if (!compat13) | |
509 | fatal("cannot happen: OUT_DRAIN"); | |
510 | return 1; | |
511 | default: | |
512 | fatal("channel_still_open: bad channel type %d", c->type); | |
513 | /* NOTREACHED */ | |
514 | } | |
515 | } | |
516 | return 0; | |
517 | } | |
518 | ||
519 | /* Returns the id of an open channel suitable for keepaliving */ | |
8e7895b8 | 520 | int |
d5bb9418 | 521 | channel_find_open(void) |
8e7895b8 | 522 | { |
9a995072 | 523 | u_int i; |
8e7895b8 | 524 | Channel *c; |
525 | ||
526 | for (i = 0; i < channels_alloc; i++) { | |
527 | c = channels[i]; | |
13de3560 | 528 | if (c == NULL || c->remote_id < 0) |
8e7895b8 | 529 | continue; |
530 | switch (c->type) { | |
531 | case SSH_CHANNEL_CLOSED: | |
532 | case SSH_CHANNEL_DYNAMIC: | |
533 | case SSH_CHANNEL_X11_LISTENER: | |
534 | case SSH_CHANNEL_PORT_LISTENER: | |
535 | case SSH_CHANNEL_RPORT_LISTENER: | |
536 | case SSH_CHANNEL_OPENING: | |
537 | case SSH_CHANNEL_CONNECTING: | |
538 | case SSH_CHANNEL_ZOMBIE: | |
539 | continue; | |
540 | case SSH_CHANNEL_LARVAL: | |
541 | case SSH_CHANNEL_AUTH_SOCKET: | |
542 | case SSH_CHANNEL_OPEN: | |
543 | case SSH_CHANNEL_X11_OPEN: | |
544 | return i; | |
545 | case SSH_CHANNEL_INPUT_DRAINING: | |
546 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
547 | if (!compat13) | |
548 | fatal("cannot happen: OUT_DRAIN"); | |
549 | return i; | |
550 | default: | |
551 | fatal("channel_find_open: bad channel type %d", c->type); | |
552 | /* NOTREACHED */ | |
553 | } | |
554 | } | |
555 | return -1; | |
556 | } | |
557 | ||
558 | ||
559 | /* | |
560 | * Returns a message describing the currently open forwarded connections, | |
561 | * suitable for sending to the client. The message contains crlf pairs for | |
562 | * newlines. | |
563 | */ | |
8e7895b8 | 564 | char * |
d5bb9418 | 565 | channel_open_message(void) |
8e7895b8 | 566 | { |
567 | Buffer buffer; | |
568 | Channel *c; | |
569 | char buf[1024], *cp; | |
9a995072 | 570 | u_int i; |
8e7895b8 | 571 | |
572 | buffer_init(&buffer); | |
573 | snprintf(buf, sizeof buf, "The following connections are open:\r\n"); | |
574 | buffer_append(&buffer, buf, strlen(buf)); | |
575 | for (i = 0; i < channels_alloc; i++) { | |
576 | c = channels[i]; | |
577 | if (c == NULL) | |
578 | continue; | |
579 | switch (c->type) { | |
580 | case SSH_CHANNEL_X11_LISTENER: | |
581 | case SSH_CHANNEL_PORT_LISTENER: | |
582 | case SSH_CHANNEL_RPORT_LISTENER: | |
583 | case SSH_CHANNEL_CLOSED: | |
584 | case SSH_CHANNEL_AUTH_SOCKET: | |
585 | case SSH_CHANNEL_ZOMBIE: | |
586 | continue; | |
587 | case SSH_CHANNEL_LARVAL: | |
588 | case SSH_CHANNEL_OPENING: | |
589 | case SSH_CHANNEL_CONNECTING: | |
590 | case SSH_CHANNEL_DYNAMIC: | |
591 | case SSH_CHANNEL_OPEN: | |
592 | case SSH_CHANNEL_X11_OPEN: | |
593 | case SSH_CHANNEL_INPUT_DRAINING: | |
594 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
5e96b616 | 595 | snprintf(buf, sizeof buf, |
596 | " #%d %.300s (t%d r%d i%d/%d o%d/%d fd %d/%d cfd %d)\r\n", | |
8e7895b8 | 597 | c->self, c->remote_name, |
598 | c->type, c->remote_id, | |
599 | c->istate, buffer_len(&c->input), | |
600 | c->ostate, buffer_len(&c->output), | |
5e96b616 | 601 | c->rfd, c->wfd, c->ctl_fd); |
8e7895b8 | 602 | buffer_append(&buffer, buf, strlen(buf)); |
603 | continue; | |
604 | default: | |
605 | fatal("channel_open_message: bad channel type %d", c->type); | |
606 | /* NOTREACHED */ | |
607 | } | |
608 | } | |
609 | buffer_append(&buffer, "\0", 1); | |
610 | cp = xstrdup(buffer_ptr(&buffer)); | |
611 | buffer_free(&buffer); | |
612 | return cp; | |
613 | } | |
614 | ||
615 | void | |
616 | channel_send_open(int id) | |
617 | { | |
618 | Channel *c = channel_lookup(id); | |
e1feb9bf | 619 | |
8e7895b8 | 620 | if (c == NULL) { |
bbe88b6d | 621 | logit("channel_send_open: %d: bad id", id); |
8e7895b8 | 622 | return; |
623 | } | |
6226a8f8 | 624 | debug2("channel %d: send open", id); |
8e7895b8 | 625 | packet_start(SSH2_MSG_CHANNEL_OPEN); |
626 | packet_put_cstring(c->ctype); | |
627 | packet_put_int(c->self); | |
628 | packet_put_int(c->local_window); | |
629 | packet_put_int(c->local_maxpacket); | |
630 | packet_send(); | |
631 | } | |
632 | ||
633 | void | |
6226a8f8 | 634 | channel_request_start(int id, char *service, int wantconfirm) |
8e7895b8 | 635 | { |
6226a8f8 | 636 | Channel *c = channel_lookup(id); |
e1feb9bf | 637 | |
8e7895b8 | 638 | if (c == NULL) { |
bbe88b6d | 639 | logit("channel_request_start: %d: unknown channel id", id); |
8e7895b8 | 640 | return; |
641 | } | |
5e96b616 | 642 | debug2("channel %d: request %s confirm %d", id, service, wantconfirm); |
8e7895b8 | 643 | packet_start(SSH2_MSG_CHANNEL_REQUEST); |
644 | packet_put_int(c->remote_id); | |
645 | packet_put_cstring(service); | |
646 | packet_put_char(wantconfirm); | |
647 | } | |
a7137f6b | 648 | |
8e7895b8 | 649 | void |
5e96b616 | 650 | channel_register_confirm(int id, channel_callback_fn *fn, void *ctx) |
8e7895b8 | 651 | { |
652 | Channel *c = channel_lookup(id); | |
e1feb9bf | 653 | |
8e7895b8 | 654 | if (c == NULL) { |
bbe88b6d | 655 | logit("channel_register_comfirm: %d: bad id", id); |
8e7895b8 | 656 | return; |
657 | } | |
05ca0898 | 658 | c->confirm = fn; |
5e96b616 | 659 | c->confirm_ctx = ctx; |
8e7895b8 | 660 | } |
a7137f6b | 661 | |
8e7895b8 | 662 | void |
8cd0437d | 663 | channel_register_cleanup(int id, channel_callback_fn *fn, int do_close) |
8e7895b8 | 664 | { |
b872f7f0 | 665 | Channel *c = channel_by_id(id); |
e1feb9bf | 666 | |
8e7895b8 | 667 | if (c == NULL) { |
bbe88b6d | 668 | logit("channel_register_cleanup: %d: bad id", id); |
8e7895b8 | 669 | return; |
670 | } | |
3cf2be58 | 671 | c->detach_user = fn; |
8cd0437d | 672 | c->detach_close = do_close; |
8e7895b8 | 673 | } |
a7137f6b | 674 | |
8e7895b8 | 675 | void |
676 | channel_cancel_cleanup(int id) | |
677 | { | |
b872f7f0 | 678 | Channel *c = channel_by_id(id); |
e1feb9bf | 679 | |
8e7895b8 | 680 | if (c == NULL) { |
bbe88b6d | 681 | logit("channel_cancel_cleanup: %d: bad id", id); |
8e7895b8 | 682 | return; |
683 | } | |
3cf2be58 | 684 | c->detach_user = NULL; |
8cd0437d | 685 | c->detach_close = 0; |
8e7895b8 | 686 | } |
a7137f6b | 687 | |
8e7895b8 | 688 | void |
c1c6a032 | 689 | channel_register_filter(int id, channel_infilter_fn *ifn, |
690 | channel_outfilter_fn *ofn) | |
8e7895b8 | 691 | { |
692 | Channel *c = channel_lookup(id); | |
e1feb9bf | 693 | |
8e7895b8 | 694 | if (c == NULL) { |
bbe88b6d | 695 | logit("channel_register_filter: %d: bad id", id); |
8e7895b8 | 696 | return; |
697 | } | |
c1c6a032 | 698 | c->input_filter = ifn; |
699 | c->output_filter = ofn; | |
8e7895b8 | 700 | } |
701 | ||
6ae2364d | 702 | void |
8e7895b8 | 703 | channel_set_fds(int id, int rfd, int wfd, int efd, |
399d1ea6 | 704 | int extusage, int nonblock, u_int window_max) |
8efc0c15 | 705 | { |
8e7895b8 | 706 | Channel *c = channel_lookup(id); |
e1feb9bf | 707 | |
8e7895b8 | 708 | if (c == NULL || c->type != SSH_CHANNEL_LARVAL) |
709 | fatal("channel_activate for non-larval channel %d.", id); | |
710 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock); | |
711 | c->type = SSH_CHANNEL_OPEN; | |
399d1ea6 | 712 | c->local_window = c->local_window_max = window_max; |
8e7895b8 | 713 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
714 | packet_put_int(c->remote_id); | |
715 | packet_put_int(c->local_window); | |
716 | packet_send(); | |
8efc0c15 | 717 | } |
718 | ||
aa3378df | 719 | /* |
7368a6c8 | 720 | * 'channel_pre*' are called just before select() to add any bits relevant to |
721 | * channels in the select bitmasks. | |
aa3378df | 722 | */ |
7368a6c8 | 723 | /* |
724 | * 'channel_post*': perform any appropriate operations for channels which | |
725 | * have events pending. | |
726 | */ | |
c8e9c167 | 727 | typedef void chan_fn(Channel *c, fd_set *readset, fd_set *writeset); |
7368a6c8 | 728 | chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE]; |
729 | chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE]; | |
8efc0c15 | 730 | |
396c147e | 731 | static void |
c8e9c167 | 732 | channel_pre_listener(Channel *c, fd_set *readset, fd_set *writeset) |
8efc0c15 | 733 | { |
7368a6c8 | 734 | FD_SET(c->sock, readset); |
735 | } | |
5260325f | 736 | |
396c147e | 737 | static void |
c8e9c167 | 738 | channel_pre_connecting(Channel *c, fd_set *readset, fd_set *writeset) |
97fb6912 | 739 | { |
740 | debug3("channel %d: waiting for connection", c->self); | |
741 | FD_SET(c->sock, writeset); | |
742 | } | |
743 | ||
396c147e | 744 | static void |
c8e9c167 | 745 | channel_pre_open_13(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 746 | { |
747 | if (buffer_len(&c->input) < packet_get_maxsize()) | |
748 | FD_SET(c->sock, readset); | |
749 | if (buffer_len(&c->output) > 0) | |
750 | FD_SET(c->sock, writeset); | |
751 | } | |
5260325f | 752 | |
396c147e | 753 | static void |
c8e9c167 | 754 | channel_pre_open(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 755 | { |
0c0738d5 | 756 | u_int limit = compat20 ? c->remote_window : packet_get_maxsize(); |
5260325f | 757 | |
7e7327a1 | 758 | if (c->istate == CHAN_INPUT_OPEN && |
0c0738d5 | 759 | limit > 0 && |
69d9d413 | 760 | buffer_len(&c->input) < limit && |
761 | buffer_check_alloc(&c->input, CHAN_RBUF)) | |
7e7327a1 | 762 | FD_SET(c->rfd, readset); |
763 | if (c->ostate == CHAN_OUTPUT_OPEN || | |
764 | c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { | |
765 | if (buffer_len(&c->output) > 0) { | |
766 | FD_SET(c->wfd, writeset); | |
767 | } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { | |
d2296ed7 | 768 | if (CHANNEL_EFD_OUTPUT_ACTIVE(c)) |
4e2e5cfd | 769 | debug2("channel %d: obuf_empty delayed efd %d/(%d)", |
770 | c->self, c->efd, buffer_len(&c->extended)); | |
d2296ed7 | 771 | else |
772 | chan_obuf_empty(c); | |
7e7327a1 | 773 | } |
774 | } | |
775 | /** XXX check close conditions, too */ | |
0c0738d5 | 776 | if (compat20 && c->efd != -1) { |
7e7327a1 | 777 | if (c->extended_usage == CHAN_EXTENDED_WRITE && |
778 | buffer_len(&c->extended) > 0) | |
779 | FD_SET(c->efd, writeset); | |
d2296ed7 | 780 | else if (!(c->flags & CHAN_EOF_SENT) && |
781 | c->extended_usage == CHAN_EXTENDED_READ && | |
7e7327a1 | 782 | buffer_len(&c->extended) < c->remote_window) |
783 | FD_SET(c->efd, readset); | |
784 | } | |
5e96b616 | 785 | /* XXX: What about efd? races? */ |
f2107e97 | 786 | if (compat20 && c->ctl_fd != -1 && |
5e96b616 | 787 | c->istate == CHAN_INPUT_OPEN && c->ostate == CHAN_OUTPUT_OPEN) |
788 | FD_SET(c->ctl_fd, readset); | |
7e7327a1 | 789 | } |
790 | ||
396c147e | 791 | static void |
c8e9c167 | 792 | channel_pre_input_draining(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 793 | { |
794 | if (buffer_len(&c->input) == 0) { | |
795 | packet_start(SSH_MSG_CHANNEL_CLOSE); | |
796 | packet_put_int(c->remote_id); | |
797 | packet_send(); | |
798 | c->type = SSH_CHANNEL_CLOSED; | |
d7ac5f18 | 799 | debug2("channel %d: closing after input drain.", c->self); |
7368a6c8 | 800 | } |
801 | } | |
5260325f | 802 | |
396c147e | 803 | static void |
c8e9c167 | 804 | channel_pre_output_draining(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 805 | { |
806 | if (buffer_len(&c->output) == 0) | |
719fc62f | 807 | chan_mark_dead(c); |
6ae2364d | 808 | else |
7368a6c8 | 809 | FD_SET(c->sock, writeset); |
810 | } | |
5260325f | 811 | |
7368a6c8 | 812 | /* |
813 | * This is a special state for X11 authentication spoofing. An opened X11 | |
814 | * connection (when authentication spoofing is being done) remains in this | |
815 | * state until the first packet has been completely read. The authentication | |
816 | * data in that packet is then substituted by the real data if it matches the | |
817 | * fake data, and the channel is put into normal mode. | |
0b242b12 | 818 | * XXX All this happens at the client side. |
8e7895b8 | 819 | * Returns: 0 = need more data, -1 = wrong cookie, 1 = ok |
7368a6c8 | 820 | */ |
396c147e | 821 | static int |
8e7895b8 | 822 | x11_open_helper(Buffer *b) |
7368a6c8 | 823 | { |
1e3b8b07 | 824 | u_char *ucp; |
825 | u_int proto_len, data_len; | |
5260325f | 826 | |
7368a6c8 | 827 | /* Check if the fixed size part of the packet is in buffer. */ |
8e7895b8 | 828 | if (buffer_len(b) < 12) |
7368a6c8 | 829 | return 0; |
830 | ||
831 | /* Parse the lengths of variable-length fields. */ | |
20905a8e | 832 | ucp = buffer_ptr(b); |
7368a6c8 | 833 | if (ucp[0] == 0x42) { /* Byte order MSB first. */ |
834 | proto_len = 256 * ucp[6] + ucp[7]; | |
835 | data_len = 256 * ucp[8] + ucp[9]; | |
836 | } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */ | |
837 | proto_len = ucp[6] + 256 * ucp[7]; | |
838 | data_len = ucp[8] + 256 * ucp[9]; | |
839 | } else { | |
d7ac5f18 | 840 | debug2("Initial X11 packet contains bad byte order byte: 0x%x", |
184eed6a | 841 | ucp[0]); |
7368a6c8 | 842 | return -1; |
843 | } | |
5260325f | 844 | |
7368a6c8 | 845 | /* Check if the whole packet is in buffer. */ |
8e7895b8 | 846 | if (buffer_len(b) < |
7368a6c8 | 847 | 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3)) |
848 | return 0; | |
5260325f | 849 | |
7368a6c8 | 850 | /* Check if authentication protocol matches. */ |
851 | if (proto_len != strlen(x11_saved_proto) || | |
852 | memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) { | |
d7ac5f18 | 853 | debug2("X11 connection uses different authentication protocol."); |
7368a6c8 | 854 | return -1; |
855 | } | |
856 | /* Check if authentication data matches our fake data. */ | |
857 | if (data_len != x11_fake_data_len || | |
858 | memcmp(ucp + 12 + ((proto_len + 3) & ~3), | |
859 | x11_fake_data, x11_fake_data_len) != 0) { | |
d7ac5f18 | 860 | debug2("X11 auth data does not match fake data."); |
7368a6c8 | 861 | return -1; |
862 | } | |
863 | /* Check fake data length */ | |
864 | if (x11_fake_data_len != x11_saved_data_len) { | |
865 | error("X11 fake_data_len %d != saved_data_len %d", | |
866 | x11_fake_data_len, x11_saved_data_len); | |
867 | return -1; | |
868 | } | |
869 | /* | |
870 | * Received authentication protocol and data match | |
871 | * our fake data. Substitute the fake data with real | |
872 | * data. | |
873 | */ | |
874 | memcpy(ucp + 12 + ((proto_len + 3) & ~3), | |
875 | x11_saved_data, x11_saved_data_len); | |
876 | return 1; | |
877 | } | |
5260325f | 878 | |
396c147e | 879 | static void |
c8e9c167 | 880 | channel_pre_x11_open_13(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 881 | { |
8e7895b8 | 882 | int ret = x11_open_helper(&c->output); |
e1feb9bf | 883 | |
7368a6c8 | 884 | if (ret == 1) { |
885 | /* Start normal processing for the channel. */ | |
886 | c->type = SSH_CHANNEL_OPEN; | |
a8be9f80 | 887 | channel_pre_open_13(c, readset, writeset); |
7368a6c8 | 888 | } else if (ret == -1) { |
889 | /* | |
890 | * We have received an X11 connection that has bad | |
891 | * authentication information. | |
892 | */ | |
bbe88b6d | 893 | logit("X11 connection rejected because of wrong authentication."); |
7368a6c8 | 894 | buffer_clear(&c->input); |
895 | buffer_clear(&c->output); | |
489aa2e9 | 896 | channel_close_fd(&c->sock); |
7368a6c8 | 897 | c->sock = -1; |
898 | c->type = SSH_CHANNEL_CLOSED; | |
899 | packet_start(SSH_MSG_CHANNEL_CLOSE); | |
900 | packet_put_int(c->remote_id); | |
901 | packet_send(); | |
902 | } | |
903 | } | |
5260325f | 904 | |
396c147e | 905 | static void |
c8e9c167 | 906 | channel_pre_x11_open(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 907 | { |
8e7895b8 | 908 | int ret = x11_open_helper(&c->output); |
a5f82435 | 909 | |
910 | /* c->force_drain = 1; */ | |
911 | ||
7368a6c8 | 912 | if (ret == 1) { |
913 | c->type = SSH_CHANNEL_OPEN; | |
0c0738d5 | 914 | channel_pre_open(c, readset, writeset); |
7368a6c8 | 915 | } else if (ret == -1) { |
bbe88b6d | 916 | logit("X11 connection rejected because of wrong authentication."); |
d7ac5f18 | 917 | debug2("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate); |
8341f420 | 918 | chan_read_failed(c); |
919 | buffer_clear(&c->input); | |
920 | chan_ibuf_empty(c); | |
921 | buffer_clear(&c->output); | |
922 | /* for proto v1, the peer will send an IEOF */ | |
923 | if (compat20) | |
924 | chan_write_failed(c); | |
925 | else | |
926 | c->type = SSH_CHANNEL_OPEN; | |
d7ac5f18 | 927 | debug2("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate); |
7368a6c8 | 928 | } |
929 | } | |
5260325f | 930 | |
28b9cb4d | 931 | /* try to decode a socks4 header */ |
396c147e | 932 | static int |
c8e9c167 | 933 | channel_decode_socks4(Channel *c, fd_set *readset, fd_set *writeset) |
0490e609 | 934 | { |
661e45a0 | 935 | char *p, *host; |
2ceb8101 | 936 | u_int len, have, i, found; |
184eed6a | 937 | char username[256]; |
0490e609 | 938 | struct { |
939 | u_int8_t version; | |
940 | u_int8_t command; | |
941 | u_int16_t dest_port; | |
28b9cb4d | 942 | struct in_addr dest_addr; |
0490e609 | 943 | } s4_req, s4_rsp; |
944 | ||
28b9cb4d | 945 | debug2("channel %d: decode socks4", c->self); |
53b8fe68 | 946 | |
947 | have = buffer_len(&c->input); | |
948 | len = sizeof(s4_req); | |
949 | if (have < len) | |
950 | return 0; | |
951 | p = buffer_ptr(&c->input); | |
952 | for (found = 0, i = len; i < have; i++) { | |
953 | if (p[i] == '\0') { | |
954 | found = 1; | |
955 | break; | |
956 | } | |
957 | if (i > 1024) { | |
958 | /* the peer is probably sending garbage */ | |
959 | debug("channel %d: decode socks4: too long", | |
960 | c->self); | |
961 | return -1; | |
962 | } | |
963 | } | |
964 | if (!found) | |
965 | return 0; | |
0490e609 | 966 | buffer_get(&c->input, (char *)&s4_req.version, 1); |
967 | buffer_get(&c->input, (char *)&s4_req.command, 1); | |
968 | buffer_get(&c->input, (char *)&s4_req.dest_port, 2); | |
28b9cb4d | 969 | buffer_get(&c->input, (char *)&s4_req.dest_addr, 4); |
53b8fe68 | 970 | have = buffer_len(&c->input); |
0490e609 | 971 | p = buffer_ptr(&c->input); |
972 | len = strlen(p); | |
6683b40f | 973 | debug2("channel %d: decode socks4: user %s/%d", c->self, p, len); |
0490e609 | 974 | if (len > have) |
28b9cb4d | 975 | fatal("channel %d: decode socks4: len %d > have %d", |
0490e609 | 976 | c->self, len, have); |
977 | strlcpy(username, p, sizeof(username)); | |
978 | buffer_consume(&c->input, len); | |
979 | buffer_consume(&c->input, 1); /* trailing '\0' */ | |
980 | ||
28b9cb4d | 981 | host = inet_ntoa(s4_req.dest_addr); |
0490e609 | 982 | strlcpy(c->path, host, sizeof(c->path)); |
983 | c->host_port = ntohs(s4_req.dest_port); | |
184eed6a | 984 | |
d7ac5f18 | 985 | debug2("channel %d: dynamic request: socks4 host %s port %u command %u", |
6683b40f | 986 | c->self, host, c->host_port, s4_req.command); |
0490e609 | 987 | |
28b9cb4d | 988 | if (s4_req.command != 1) { |
989 | debug("channel %d: cannot handle: socks4 cn %d", | |
990 | c->self, s4_req.command); | |
991 | return -1; | |
0490e609 | 992 | } |
28b9cb4d | 993 | s4_rsp.version = 0; /* vn: 0 for reply */ |
994 | s4_rsp.command = 90; /* cd: req granted */ | |
0490e609 | 995 | s4_rsp.dest_port = 0; /* ignored */ |
28b9cb4d | 996 | s4_rsp.dest_addr.s_addr = INADDR_ANY; /* ignored */ |
15dd2c4f | 997 | buffer_append(&c->output, &s4_rsp, sizeof(s4_rsp)); |
28b9cb4d | 998 | return 1; |
0490e609 | 999 | } |
1000 | ||
f49658f5 | 1001 | /* try to decode a socks5 header */ |
1002 | #define SSH_SOCKS5_AUTHDONE 0x1000 | |
1003 | #define SSH_SOCKS5_NOAUTH 0x00 | |
1004 | #define SSH_SOCKS5_IPV4 0x01 | |
1005 | #define SSH_SOCKS5_DOMAIN 0x03 | |
1006 | #define SSH_SOCKS5_IPV6 0x04 | |
1007 | #define SSH_SOCKS5_CONNECT 0x01 | |
1008 | #define SSH_SOCKS5_SUCCESS 0x00 | |
1009 | ||
1010 | static int | |
c8e9c167 | 1011 | channel_decode_socks5(Channel *c, fd_set *readset, fd_set *writeset) |
f49658f5 | 1012 | { |
1013 | struct { | |
1014 | u_int8_t version; | |
1015 | u_int8_t command; | |
1016 | u_int8_t reserved; | |
1017 | u_int8_t atyp; | |
1018 | } s5_req, s5_rsp; | |
1019 | u_int16_t dest_port; | |
1020 | u_char *p, dest_addr[255+1]; | |
a217e418 | 1021 | u_int have, need, i, found, nmethods, addrlen, af; |
f49658f5 | 1022 | |
1023 | debug2("channel %d: decode socks5", c->self); | |
1024 | p = buffer_ptr(&c->input); | |
1025 | if (p[0] != 0x05) | |
1026 | return -1; | |
1027 | have = buffer_len(&c->input); | |
1028 | if (!(c->flags & SSH_SOCKS5_AUTHDONE)) { | |
1029 | /* format: ver | nmethods | methods */ | |
aff51935 | 1030 | if (have < 2) |
f49658f5 | 1031 | return 0; |
1032 | nmethods = p[1]; | |
1033 | if (have < nmethods + 2) | |
1034 | return 0; | |
1035 | /* look for method: "NO AUTHENTICATION REQUIRED" */ | |
1036 | for (found = 0, i = 2 ; i < nmethods + 2; i++) { | |
1037 | if (p[i] == SSH_SOCKS5_NOAUTH ) { | |
1038 | found = 1; | |
1039 | break; | |
1040 | } | |
1041 | } | |
1042 | if (!found) { | |
1043 | debug("channel %d: method SSH_SOCKS5_NOAUTH not found", | |
1044 | c->self); | |
1045 | return -1; | |
1046 | } | |
1047 | buffer_consume(&c->input, nmethods + 2); | |
1048 | buffer_put_char(&c->output, 0x05); /* version */ | |
1049 | buffer_put_char(&c->output, SSH_SOCKS5_NOAUTH); /* method */ | |
1050 | FD_SET(c->sock, writeset); | |
1051 | c->flags |= SSH_SOCKS5_AUTHDONE; | |
1052 | debug2("channel %d: socks5 auth done", c->self); | |
1053 | return 0; /* need more */ | |
1054 | } | |
1055 | debug2("channel %d: socks5 post auth", c->self); | |
1056 | if (have < sizeof(s5_req)+1) | |
1057 | return 0; /* need more */ | |
5b5f6af7 | 1058 | memcpy(&s5_req, p, sizeof(s5_req)); |
f49658f5 | 1059 | if (s5_req.version != 0x05 || |
1060 | s5_req.command != SSH_SOCKS5_CONNECT || | |
1061 | s5_req.reserved != 0x00) { | |
d7ac5f18 | 1062 | debug2("channel %d: only socks5 connect supported", c->self); |
f49658f5 | 1063 | return -1; |
1064 | } | |
f8cc7664 | 1065 | switch (s5_req.atyp){ |
f49658f5 | 1066 | case SSH_SOCKS5_IPV4: |
1067 | addrlen = 4; | |
1068 | af = AF_INET; | |
1069 | break; | |
1070 | case SSH_SOCKS5_DOMAIN: | |
1071 | addrlen = p[sizeof(s5_req)]; | |
1072 | af = -1; | |
1073 | break; | |
1074 | case SSH_SOCKS5_IPV6: | |
1075 | addrlen = 16; | |
1076 | af = AF_INET6; | |
1077 | break; | |
1078 | default: | |
d7ac5f18 | 1079 | debug2("channel %d: bad socks5 atyp %d", c->self, s5_req.atyp); |
f49658f5 | 1080 | return -1; |
1081 | } | |
a217e418 | 1082 | need = sizeof(s5_req) + addrlen + 2; |
1083 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) | |
1084 | need++; | |
1085 | if (have < need) | |
f49658f5 | 1086 | return 0; |
1087 | buffer_consume(&c->input, sizeof(s5_req)); | |
1088 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) | |
1089 | buffer_consume(&c->input, 1); /* host string length */ | |
1090 | buffer_get(&c->input, (char *)&dest_addr, addrlen); | |
1091 | buffer_get(&c->input, (char *)&dest_port, 2); | |
1092 | dest_addr[addrlen] = '\0'; | |
1093 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) | |
f6be21a0 | 1094 | strlcpy(c->path, (char *)dest_addr, sizeof(c->path)); |
f49658f5 | 1095 | else if (inet_ntop(af, dest_addr, c->path, sizeof(c->path)) == NULL) |
1096 | return -1; | |
1097 | c->host_port = ntohs(dest_port); | |
b6453d99 | 1098 | |
d7ac5f18 | 1099 | debug2("channel %d: dynamic request: socks5 host %s port %u command %u", |
f49658f5 | 1100 | c->self, c->path, c->host_port, s5_req.command); |
1101 | ||
1102 | s5_rsp.version = 0x05; | |
1103 | s5_rsp.command = SSH_SOCKS5_SUCCESS; | |
1104 | s5_rsp.reserved = 0; /* ignored */ | |
1105 | s5_rsp.atyp = SSH_SOCKS5_IPV4; | |
1106 | ((struct in_addr *)&dest_addr)->s_addr = INADDR_ANY; | |
1107 | dest_port = 0; /* ignored */ | |
1108 | ||
15dd2c4f | 1109 | buffer_append(&c->output, &s5_rsp, sizeof(s5_rsp)); |
1110 | buffer_append(&c->output, &dest_addr, sizeof(struct in_addr)); | |
1111 | buffer_append(&c->output, &dest_port, sizeof(dest_port)); | |
f49658f5 | 1112 | return 1; |
1113 | } | |
1114 | ||
28b9cb4d | 1115 | /* dynamic port forwarding */ |
396c147e | 1116 | static void |
c8e9c167 | 1117 | channel_pre_dynamic(Channel *c, fd_set *readset, fd_set *writeset) |
28b9cb4d | 1118 | { |
1119 | u_char *p; | |
2ceb8101 | 1120 | u_int have; |
1121 | int ret; | |
28b9cb4d | 1122 | |
1123 | have = buffer_len(&c->input); | |
639cb8ab | 1124 | c->delayed = 0; |
28b9cb4d | 1125 | debug2("channel %d: pre_dynamic: have %d", c->self, have); |
070adba2 | 1126 | /* buffer_dump(&c->input); */ |
28b9cb4d | 1127 | /* check if the fixed size part of the packet is in buffer. */ |
f49658f5 | 1128 | if (have < 3) { |
28b9cb4d | 1129 | /* need more */ |
1130 | FD_SET(c->sock, readset); | |
1131 | return; | |
1132 | } | |
1133 | /* try to guess the protocol */ | |
1134 | p = buffer_ptr(&c->input); | |
1135 | switch (p[0]) { | |
6683b40f | 1136 | case 0x04: |
1137 | ret = channel_decode_socks4(c, readset, writeset); | |
1138 | break; | |
f49658f5 | 1139 | case 0x05: |
1140 | ret = channel_decode_socks5(c, readset, writeset); | |
1141 | break; | |
28b9cb4d | 1142 | default: |
1143 | ret = -1; | |
1144 | break; | |
1145 | } | |
1146 | if (ret < 0) { | |
719fc62f | 1147 | chan_mark_dead(c); |
28b9cb4d | 1148 | } else if (ret == 0) { |
1149 | debug2("channel %d: pre_dynamic: need more", c->self); | |
1150 | /* need more */ | |
1151 | FD_SET(c->sock, readset); | |
1152 | } else { | |
1153 | /* switch to the next state */ | |
1154 | c->type = SSH_CHANNEL_OPENING; | |
1155 | port_open_helper(c, "direct-tcpip"); | |
1156 | } | |
1157 | } | |
0490e609 | 1158 | |
7368a6c8 | 1159 | /* This is our fake X11 server socket. */ |
396c147e | 1160 | static void |
c8e9c167 | 1161 | channel_post_x11_listener(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1162 | { |
719fc62f | 1163 | Channel *nc; |
7368a6c8 | 1164 | struct sockaddr addr; |
bcc0381e | 1165 | int newsock; |
7368a6c8 | 1166 | socklen_t addrlen; |
865ac82e | 1167 | char buf[16384], *remote_ipaddr; |
0b242b12 | 1168 | int remote_port; |
7368a6c8 | 1169 | |
1170 | if (FD_ISSET(c->sock, readset)) { | |
1171 | debug("X11 connection requested."); | |
1172 | addrlen = sizeof(addr); | |
1173 | newsock = accept(c->sock, &addr, &addrlen); | |
ac151b18 | 1174 | if (c->single_connection) { |
d7ac5f18 | 1175 | debug2("single_connection: closing X11 listener."); |
ac151b18 | 1176 | channel_close_fd(&c->sock); |
1177 | chan_mark_dead(c); | |
1178 | } | |
7368a6c8 | 1179 | if (newsock < 0) { |
1180 | error("accept: %.100s", strerror(errno)); | |
1181 | return; | |
5260325f | 1182 | } |
bcc0381e | 1183 | set_nodelay(newsock); |
865ac82e | 1184 | remote_ipaddr = get_peer_ipaddr(newsock); |
0b242b12 | 1185 | remote_port = get_peer_port(newsock); |
7368a6c8 | 1186 | snprintf(buf, sizeof buf, "X11 connection from %.200s port %d", |
865ac82e | 1187 | remote_ipaddr, remote_port); |
0b242b12 | 1188 | |
719fc62f | 1189 | nc = channel_new("accepted x11 socket", |
0b242b12 | 1190 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
0d942eff | 1191 | c->local_window_max, c->local_maxpacket, 0, buf, 1); |
0b242b12 | 1192 | if (compat20) { |
1193 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1194 | packet_put_cstring("x11"); | |
719fc62f | 1195 | packet_put_int(nc->self); |
ac151b18 | 1196 | packet_put_int(nc->local_window_max); |
1197 | packet_put_int(nc->local_maxpacket); | |
865ac82e | 1198 | /* originator ipaddr and port */ |
1199 | packet_put_cstring(remote_ipaddr); | |
d0c832f3 | 1200 | if (datafellows & SSH_BUG_X11FWD) { |
d7ac5f18 | 1201 | debug2("ssh2 x11 bug compat mode"); |
d0c832f3 | 1202 | } else { |
1203 | packet_put_int(remote_port); | |
1204 | } | |
0b242b12 | 1205 | packet_send(); |
1206 | } else { | |
1207 | packet_start(SSH_SMSG_X11_OPEN); | |
719fc62f | 1208 | packet_put_int(nc->self); |
8e7895b8 | 1209 | if (packet_get_protocol_flags() & |
1210 | SSH_PROTOFLAG_HOST_IN_FWD_OPEN) | |
449c5ba5 | 1211 | packet_put_cstring(buf); |
0b242b12 | 1212 | packet_send(); |
1213 | } | |
865ac82e | 1214 | xfree(remote_ipaddr); |
8efc0c15 | 1215 | } |
8efc0c15 | 1216 | } |
1217 | ||
396c147e | 1218 | static void |
0490e609 | 1219 | port_open_helper(Channel *c, char *rtype) |
1220 | { | |
1221 | int direct; | |
1222 | char buf[1024]; | |
1223 | char *remote_ipaddr = get_peer_ipaddr(c->sock); | |
29798ed0 | 1224 | int remote_port = get_peer_port(c->sock); |
0490e609 | 1225 | |
1226 | direct = (strcmp(rtype, "direct-tcpip") == 0); | |
1227 | ||
1228 | snprintf(buf, sizeof buf, | |
1229 | "%s: listening port %d for %.100s port %d, " | |
1230 | "connect from %.200s port %d", | |
1231 | rtype, c->listening_port, c->path, c->host_port, | |
1232 | remote_ipaddr, remote_port); | |
1233 | ||
1234 | xfree(c->remote_name); | |
1235 | c->remote_name = xstrdup(buf); | |
1236 | ||
1237 | if (compat20) { | |
1238 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1239 | packet_put_cstring(rtype); | |
1240 | packet_put_int(c->self); | |
1241 | packet_put_int(c->local_window_max); | |
1242 | packet_put_int(c->local_maxpacket); | |
1243 | if (direct) { | |
1244 | /* target host, port */ | |
1245 | packet_put_cstring(c->path); | |
1246 | packet_put_int(c->host_port); | |
1247 | } else { | |
1248 | /* listen address, port */ | |
1249 | packet_put_cstring(c->path); | |
1250 | packet_put_int(c->listening_port); | |
1251 | } | |
1252 | /* originator host and port */ | |
1253 | packet_put_cstring(remote_ipaddr); | |
29798ed0 | 1254 | packet_put_int((u_int)remote_port); |
0490e609 | 1255 | packet_send(); |
1256 | } else { | |
1257 | packet_start(SSH_MSG_PORT_OPEN); | |
1258 | packet_put_int(c->self); | |
1259 | packet_put_cstring(c->path); | |
1260 | packet_put_int(c->host_port); | |
8e7895b8 | 1261 | if (packet_get_protocol_flags() & |
1262 | SSH_PROTOFLAG_HOST_IN_FWD_OPEN) | |
0490e609 | 1263 | packet_put_cstring(c->remote_name); |
1264 | packet_send(); | |
1265 | } | |
1266 | xfree(remote_ipaddr); | |
1267 | } | |
1268 | ||
442aee3a | 1269 | static void |
1270 | channel_set_reuseaddr(int fd) | |
1271 | { | |
1272 | int on = 1; | |
1273 | ||
1274 | /* | |
1275 | * Set socket options. | |
1276 | * Allow local port reuse in TIME_WAIT. | |
1277 | */ | |
1278 | if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1) | |
1279 | error("setsockopt SO_REUSEADDR fd %d: %s", fd, strerror(errno)); | |
1280 | } | |
1281 | ||
aa3378df | 1282 | /* |
7368a6c8 | 1283 | * This socket is listening for connections to a forwarded TCP/IP port. |
aa3378df | 1284 | */ |
396c147e | 1285 | static void |
c8e9c167 | 1286 | channel_post_port_listener(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1287 | { |
0490e609 | 1288 | Channel *nc; |
7368a6c8 | 1289 | struct sockaddr addr; |
719fc62f | 1290 | int newsock, nextstate; |
7368a6c8 | 1291 | socklen_t addrlen; |
0490e609 | 1292 | char *rtype; |
fa08c86b | 1293 | |
7368a6c8 | 1294 | if (FD_ISSET(c->sock, readset)) { |
1295 | debug("Connection to port %d forwarding " | |
1296 | "to %.100s port %d requested.", | |
1297 | c->listening_port, c->path, c->host_port); | |
0490e609 | 1298 | |
639cb8ab | 1299 | if (c->type == SSH_CHANNEL_RPORT_LISTENER) { |
1300 | nextstate = SSH_CHANNEL_OPENING; | |
1301 | rtype = "forwarded-tcpip"; | |
1302 | } else { | |
1303 | if (c->host_port == 0) { | |
1304 | nextstate = SSH_CHANNEL_DYNAMIC; | |
f3964cb9 | 1305 | rtype = "dynamic-tcpip"; |
639cb8ab | 1306 | } else { |
1307 | nextstate = SSH_CHANNEL_OPENING; | |
1308 | rtype = "direct-tcpip"; | |
1309 | } | |
1310 | } | |
0490e609 | 1311 | |
7368a6c8 | 1312 | addrlen = sizeof(addr); |
1313 | newsock = accept(c->sock, &addr, &addrlen); | |
1314 | if (newsock < 0) { | |
1315 | error("accept: %.100s", strerror(errno)); | |
1316 | return; | |
1317 | } | |
811a6342 | 1318 | set_nodelay(newsock); |
0d942eff | 1319 | nc = channel_new(rtype, nextstate, newsock, newsock, -1, |
1320 | c->local_window_max, c->local_maxpacket, 0, rtype, 1); | |
0490e609 | 1321 | nc->listening_port = c->listening_port; |
1322 | nc->host_port = c->host_port; | |
1323 | strlcpy(nc->path, c->path, sizeof(nc->path)); | |
1324 | ||
639cb8ab | 1325 | if (nextstate == SSH_CHANNEL_DYNAMIC) { |
1326 | /* | |
1327 | * do not call the channel_post handler until | |
1328 | * this flag has been reset by a pre-handler. | |
1329 | * otherwise the FD_ISSET calls might overflow | |
1330 | */ | |
1331 | nc->delayed = 1; | |
1332 | } else { | |
0490e609 | 1333 | port_open_helper(nc, rtype); |
639cb8ab | 1334 | } |
7368a6c8 | 1335 | } |
1336 | } | |
8efc0c15 | 1337 | |
7368a6c8 | 1338 | /* |
1339 | * This is the authentication agent socket listening for connections from | |
1340 | * clients. | |
1341 | */ | |
396c147e | 1342 | static void |
c8e9c167 | 1343 | channel_post_auth_listener(Channel *c, fd_set *readset, fd_set *writeset) |
8efc0c15 | 1344 | { |
719fc62f | 1345 | Channel *nc; |
1346 | int newsock; | |
5260325f | 1347 | struct sockaddr addr; |
48e671d5 | 1348 | socklen_t addrlen; |
5260325f | 1349 | |
7368a6c8 | 1350 | if (FD_ISSET(c->sock, readset)) { |
1351 | addrlen = sizeof(addr); | |
1352 | newsock = accept(c->sock, &addr, &addrlen); | |
1353 | if (newsock < 0) { | |
1354 | error("accept from auth socket: %.100s", strerror(errno)); | |
1355 | return; | |
1356 | } | |
719fc62f | 1357 | nc = channel_new("accepted auth socket", |
fa08c86b | 1358 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
1359 | c->local_window_max, c->local_maxpacket, | |
0d942eff | 1360 | 0, "accepted auth socket", 1); |
fa08c86b | 1361 | if (compat20) { |
1362 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1363 | packet_put_cstring("auth-agent@openssh.com"); | |
719fc62f | 1364 | packet_put_int(nc->self); |
fa08c86b | 1365 | packet_put_int(c->local_window_max); |
1366 | packet_put_int(c->local_maxpacket); | |
1367 | } else { | |
1368 | packet_start(SSH_SMSG_AGENT_OPEN); | |
719fc62f | 1369 | packet_put_int(nc->self); |
fa08c86b | 1370 | } |
7368a6c8 | 1371 | packet_send(); |
1372 | } | |
1373 | } | |
5260325f | 1374 | |
396c147e | 1375 | static void |
c8e9c167 | 1376 | channel_post_connecting(Channel *c, fd_set *readset, fd_set *writeset) |
97fb6912 | 1377 | { |
d18e0850 | 1378 | int err = 0; |
8ab2cb35 | 1379 | socklen_t sz = sizeof(err); |
d18e0850 | 1380 | |
97fb6912 | 1381 | if (FD_ISSET(c->sock, writeset)) { |
db518d9b | 1382 | if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, &err, &sz) < 0) { |
d18e0850 | 1383 | err = errno; |
1384 | error("getsockopt SO_ERROR failed"); | |
1385 | } | |
1386 | if (err == 0) { | |
1387 | debug("channel %d: connected", c->self); | |
1388 | c->type = SSH_CHANNEL_OPEN; | |
1389 | if (compat20) { | |
1390 | packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1391 | packet_put_int(c->remote_id); | |
1392 | packet_put_int(c->self); | |
1393 | packet_put_int(c->local_window); | |
1394 | packet_put_int(c->local_maxpacket); | |
1395 | } else { | |
1396 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1397 | packet_put_int(c->remote_id); | |
1398 | packet_put_int(c->self); | |
1399 | } | |
97fb6912 | 1400 | } else { |
d18e0850 | 1401 | debug("channel %d: not connected: %s", |
1402 | c->self, strerror(err)); | |
1403 | if (compat20) { | |
1404 | packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); | |
1405 | packet_put_int(c->remote_id); | |
1406 | packet_put_int(SSH2_OPEN_CONNECT_FAILED); | |
1407 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { | |
1408 | packet_put_cstring(strerror(err)); | |
1409 | packet_put_cstring(""); | |
1410 | } | |
97fb6912 | 1411 | } else { |
d18e0850 | 1412 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
1413 | packet_put_int(c->remote_id); | |
97fb6912 | 1414 | } |
d18e0850 | 1415 | chan_mark_dead(c); |
97fb6912 | 1416 | } |
d18e0850 | 1417 | packet_send(); |
97fb6912 | 1418 | } |
1419 | } | |
1420 | ||
396c147e | 1421 | static int |
c8e9c167 | 1422 | channel_handle_rfd(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1423 | { |
fa1d7d85 | 1424 | char buf[CHAN_RBUF]; |
7368a6c8 | 1425 | int len; |
1426 | ||
6fd8622b | 1427 | if (c->rfd != -1 && |
7368a6c8 | 1428 | FD_ISSET(c->rfd, readset)) { |
ea8c44d9 | 1429 | errno = 0; |
7368a6c8 | 1430 | len = read(c->rfd, buf, sizeof(buf)); |
0fbe8c74 | 1431 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
1432 | return 1; | |
ea8c44d9 | 1433 | #ifndef PTY_ZEROREAD |
7368a6c8 | 1434 | if (len <= 0) { |
ea8c44d9 | 1435 | #else |
9c04d67d | 1436 | if ((!c->isatty && len <= 0) || |
1437 | (c->isatty && (len < 0 || (len == 0 && errno != 0)))) { | |
ea8c44d9 | 1438 | #endif |
d7ac5f18 | 1439 | debug2("channel %d: read<=0 rfd %d len %d", |
7368a6c8 | 1440 | c->self, c->rfd, len); |
28b9cb4d | 1441 | if (c->type != SSH_CHANNEL_OPEN) { |
d7ac5f18 | 1442 | debug2("channel %d: not open", c->self); |
719fc62f | 1443 | chan_mark_dead(c); |
0490e609 | 1444 | return -1; |
28b9cb4d | 1445 | } else if (compat13) { |
9c50edcf | 1446 | buffer_clear(&c->output); |
7368a6c8 | 1447 | c->type = SSH_CHANNEL_INPUT_DRAINING; |
d7ac5f18 | 1448 | debug2("channel %d: input draining.", c->self); |
7368a6c8 | 1449 | } else { |
1450 | chan_read_failed(c); | |
5260325f | 1451 | } |
7368a6c8 | 1452 | return -1; |
1453 | } | |
6aacefa7 | 1454 | if (c->input_filter != NULL) { |
2e73a022 | 1455 | if (c->input_filter(c, buf, len) == -1) { |
d7ac5f18 | 1456 | debug2("channel %d: filter stops", c->self); |
2e73a022 | 1457 | chan_read_failed(c); |
1458 | } | |
d20f3c9e | 1459 | } else if (c->datagram) { |
1460 | buffer_put_string(&c->input, buf, len); | |
2e73a022 | 1461 | } else { |
1462 | buffer_append(&c->input, buf, len); | |
1463 | } | |
7368a6c8 | 1464 | } |
1465 | return 1; | |
1466 | } | |
a7137f6b | 1467 | |
396c147e | 1468 | static int |
c8e9c167 | 1469 | channel_handle_wfd(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1470 | { |
95ce5599 | 1471 | struct termios tio; |
c1c6a032 | 1472 | u_char *data = NULL, *buf; |
780a9951 | 1473 | u_int dlen; |
7368a6c8 | 1474 | int len; |
1475 | ||
1476 | /* Send buffered output data to the socket. */ | |
6fd8622b | 1477 | if (c->wfd != -1 && |
7368a6c8 | 1478 | FD_ISSET(c->wfd, writeset) && |
1479 | buffer_len(&c->output) > 0) { | |
c1c6a032 | 1480 | if (c->output_filter != NULL) { |
1481 | if ((buf = c->output_filter(c, &data, &dlen)) == NULL) { | |
1482 | debug2("channel %d: filter stops", c->self); | |
d7b37427 | 1483 | if (c->type != SSH_CHANNEL_OPEN) |
1484 | chan_mark_dead(c); | |
1485 | else | |
1486 | chan_write_failed(c); | |
1487 | return -1; | |
c1c6a032 | 1488 | } |
1489 | } else if (c->datagram) { | |
1490 | buf = data = buffer_get_string(&c->output, &dlen); | |
1491 | } else { | |
1492 | buf = data = buffer_ptr(&c->output); | |
1493 | dlen = buffer_len(&c->output); | |
1494 | } | |
1495 | ||
d20f3c9e | 1496 | if (c->datagram) { |
d20f3c9e | 1497 | /* ignore truncated writes, datagrams might get lost */ |
1498 | c->local_consumed += dlen + 4; | |
c1c6a032 | 1499 | len = write(c->wfd, buf, dlen); |
d20f3c9e | 1500 | xfree(data); |
1501 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) | |
1502 | return 1; | |
1503 | if (len <= 0) { | |
1504 | if (c->type != SSH_CHANNEL_OPEN) | |
1505 | chan_mark_dead(c); | |
1506 | else | |
1507 | chan_write_failed(c); | |
1508 | return -1; | |
1509 | } | |
1510 | return 1; | |
1511 | } | |
64c0ce80 | 1512 | #ifdef _AIX |
aff51935 | 1513 | /* XXX: Later AIX versions can't push as much data to tty */ |
7fbb4189 | 1514 | if (compat20 && c->wfd_isatty) |
1515 | dlen = MIN(dlen, 8*1024); | |
64c0ce80 | 1516 | #endif |
c1c6a032 | 1517 | |
1518 | len = write(c->wfd, buf, dlen); | |
0fbe8c74 | 1519 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
1520 | return 1; | |
7368a6c8 | 1521 | if (len <= 0) { |
28b9cb4d | 1522 | if (c->type != SSH_CHANNEL_OPEN) { |
d7ac5f18 | 1523 | debug2("channel %d: not open", c->self); |
719fc62f | 1524 | chan_mark_dead(c); |
28b9cb4d | 1525 | return -1; |
1526 | } else if (compat13) { | |
9c50edcf | 1527 | buffer_clear(&c->output); |
d7ac5f18 | 1528 | debug2("channel %d: input draining.", c->self); |
7368a6c8 | 1529 | c->type = SSH_CHANNEL_INPUT_DRAINING; |
1530 | } else { | |
1531 | chan_write_failed(c); | |
5260325f | 1532 | } |
7368a6c8 | 1533 | return -1; |
1534 | } | |
c1c6a032 | 1535 | if (compat20 && c->isatty && dlen >= 1 && buf[0] != '\r') { |
0ae4fe1d | 1536 | if (tcgetattr(c->wfd, &tio) == 0 && |
1537 | !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) { | |
1538 | /* | |
1539 | * Simulate echo to reduce the impact of | |
355724fc | 1540 | * traffic analysis. We need to match the |
95ce5599 | 1541 | * size of a SSH2_MSG_CHANNEL_DATA message |
c1c6a032 | 1542 | * (4 byte channel id + buf) |
0ae4fe1d | 1543 | */ |
95ce5599 | 1544 | packet_send_ignore(4 + len); |
0ae4fe1d | 1545 | packet_send(); |
0ae4fe1d | 1546 | } |
1547 | } | |
7368a6c8 | 1548 | buffer_consume(&c->output, len); |
7e7327a1 | 1549 | if (compat20 && len > 0) { |
1550 | c->local_consumed += len; | |
1551 | } | |
1552 | } | |
1553 | return 1; | |
1554 | } | |
a7137f6b | 1555 | |
396c147e | 1556 | static int |
c8e9c167 | 1557 | channel_handle_efd(Channel *c, fd_set *readset, fd_set *writeset) |
7e7327a1 | 1558 | { |
fa1d7d85 | 1559 | char buf[CHAN_RBUF]; |
7e7327a1 | 1560 | int len; |
1561 | ||
8ce64345 | 1562 | /** XXX handle drain efd, too */ |
7e7327a1 | 1563 | if (c->efd != -1) { |
1564 | if (c->extended_usage == CHAN_EXTENDED_WRITE && | |
1565 | FD_ISSET(c->efd, writeset) && | |
1566 | buffer_len(&c->extended) > 0) { | |
1567 | len = write(c->efd, buffer_ptr(&c->extended), | |
1568 | buffer_len(&c->extended)); | |
de273eef | 1569 | debug2("channel %d: written %d to efd %d", |
7e7327a1 | 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 write-efd %d", | |
1575 | c->self, c->efd); | |
489aa2e9 | 1576 | channel_close_fd(&c->efd); |
ee55dacf | 1577 | } else { |
7e7327a1 | 1578 | buffer_consume(&c->extended, len); |
1579 | c->local_consumed += len; | |
1580 | } | |
1581 | } else if (c->extended_usage == CHAN_EXTENDED_READ && | |
1582 | FD_ISSET(c->efd, readset)) { | |
1583 | len = read(c->efd, buf, sizeof(buf)); | |
de273eef | 1584 | debug2("channel %d: read %d from efd %d", |
184eed6a | 1585 | c->self, len, c->efd); |
ee55dacf | 1586 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
1587 | return 1; | |
1588 | if (len <= 0) { | |
1589 | debug2("channel %d: closing read-efd %d", | |
8ce64345 | 1590 | c->self, c->efd); |
489aa2e9 | 1591 | channel_close_fd(&c->efd); |
ee55dacf | 1592 | } else { |
7e7327a1 | 1593 | buffer_append(&c->extended, buf, len); |
ee55dacf | 1594 | } |
7e7327a1 | 1595 | } |
1596 | } | |
1597 | return 1; | |
1598 | } | |
a7137f6b | 1599 | |
396c147e | 1600 | static int |
c8e9c167 | 1601 | channel_handle_ctl(Channel *c, fd_set *readset, fd_set *writeset) |
5e96b616 | 1602 | { |
1603 | char buf[16]; | |
1604 | int len; | |
1605 | ||
1606 | /* Monitor control fd to detect if the slave client exits */ | |
1607 | if (c->ctl_fd != -1 && FD_ISSET(c->ctl_fd, readset)) { | |
1608 | len = read(c->ctl_fd, buf, sizeof(buf)); | |
1609 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) | |
1610 | return 1; | |
1611 | if (len <= 0) { | |
1612 | debug2("channel %d: ctl read<=0", c->self); | |
1613 | if (c->type != SSH_CHANNEL_OPEN) { | |
1614 | debug2("channel %d: not open", c->self); | |
1615 | chan_mark_dead(c); | |
1616 | return -1; | |
1617 | } else { | |
1618 | chan_read_failed(c); | |
1619 | chan_write_failed(c); | |
1620 | } | |
1621 | return -1; | |
1622 | } else | |
1623 | fatal("%s: unexpected data on ctl fd", __func__); | |
1624 | } | |
1625 | return 1; | |
1626 | } | |
a7137f6b | 1627 | |
5e96b616 | 1628 | static int |
ee55dacf | 1629 | channel_check_window(Channel *c) |
7e7327a1 | 1630 | { |
28b9cb4d | 1631 | if (c->type == SSH_CHANNEL_OPEN && |
1632 | !(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) && | |
7e7327a1 | 1633 | c->local_window < c->local_window_max/2 && |
1634 | c->local_consumed > 0) { | |
1635 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); | |
1636 | packet_put_int(c->remote_id); | |
1637 | packet_put_int(c->local_consumed); | |
1638 | packet_send(); | |
de273eef | 1639 | debug2("channel %d: window %d sent adjust %d", |
7e7327a1 | 1640 | c->self, c->local_window, |
1641 | c->local_consumed); | |
1642 | c->local_window += c->local_consumed; | |
1643 | c->local_consumed = 0; | |
7368a6c8 | 1644 | } |
1645 | return 1; | |
1646 | } | |
5260325f | 1647 | |
396c147e | 1648 | static void |
c8e9c167 | 1649 | channel_post_open(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1650 | { |
639cb8ab | 1651 | if (c->delayed) |
1652 | return; | |
7368a6c8 | 1653 | channel_handle_rfd(c, readset, writeset); |
1654 | channel_handle_wfd(c, readset, writeset); | |
0c0738d5 | 1655 | if (!compat20) |
639cb8ab | 1656 | return; |
7e7327a1 | 1657 | channel_handle_efd(c, readset, writeset); |
5e96b616 | 1658 | channel_handle_ctl(c, readset, writeset); |
ee55dacf | 1659 | channel_check_window(c); |
7e7327a1 | 1660 | } |
1661 | ||
396c147e | 1662 | static void |
c8e9c167 | 1663 | channel_post_output_drain_13(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1664 | { |
1665 | int len; | |
e1feb9bf | 1666 | |
7368a6c8 | 1667 | /* Send buffered output data to the socket. */ |
1668 | if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) { | |
1669 | len = write(c->sock, buffer_ptr(&c->output), | |
1670 | buffer_len(&c->output)); | |
1671 | if (len <= 0) | |
9c50edcf | 1672 | buffer_clear(&c->output); |
7368a6c8 | 1673 | else |
1674 | buffer_consume(&c->output, len); | |
1675 | } | |
1676 | } | |
5260325f | 1677 | |
396c147e | 1678 | static void |
7e7327a1 | 1679 | channel_handler_init_20(void) |
1680 | { | |
0c0738d5 | 1681 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open; |
0b242b12 | 1682 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
7e7327a1 | 1683 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; |
fa08c86b | 1684 | channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener; |
0b242b12 | 1685 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
fa08c86b | 1686 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; |
97fb6912 | 1687 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1688 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7e7327a1 | 1689 | |
0c0738d5 | 1690 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
7e7327a1 | 1691 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; |
fa08c86b | 1692 | channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener; |
0b242b12 | 1693 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
fa08c86b | 1694 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; |
97fb6912 | 1695 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 1696 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
7e7327a1 | 1697 | } |
1698 | ||
396c147e | 1699 | static void |
7368a6c8 | 1700 | channel_handler_init_13(void) |
1701 | { | |
1702 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13; | |
1703 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_13; | |
1704 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; | |
1705 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; | |
1706 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; | |
1707 | channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining; | |
1708 | channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining; | |
97fb6912 | 1709 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1710 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7368a6c8 | 1711 | |
0c0738d5 | 1712 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
7368a6c8 | 1713 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
1714 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; | |
1715 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; | |
1716 | channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13; | |
97fb6912 | 1717 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 1718 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
7368a6c8 | 1719 | } |
5260325f | 1720 | |
396c147e | 1721 | static void |
7368a6c8 | 1722 | channel_handler_init_15(void) |
1723 | { | |
0c0738d5 | 1724 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open; |
0b242b12 | 1725 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
7368a6c8 | 1726 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
1727 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; | |
1728 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; | |
97fb6912 | 1729 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1730 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7368a6c8 | 1731 | |
1732 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; | |
1733 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; | |
1734 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; | |
0c0738d5 | 1735 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
97fb6912 | 1736 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 1737 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
7368a6c8 | 1738 | } |
1739 | ||
396c147e | 1740 | static void |
7368a6c8 | 1741 | channel_handler_init(void) |
1742 | { | |
1743 | int i; | |
e1feb9bf | 1744 | |
184eed6a | 1745 | for (i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) { |
7368a6c8 | 1746 | channel_pre[i] = NULL; |
1747 | channel_post[i] = NULL; | |
1748 | } | |
7e7327a1 | 1749 | if (compat20) |
1750 | channel_handler_init_20(); | |
1751 | else if (compat13) | |
7368a6c8 | 1752 | channel_handler_init_13(); |
1753 | else | |
1754 | channel_handler_init_15(); | |
1755 | } | |
1756 | ||
418e724c | 1757 | /* gc dead channels */ |
1758 | static void | |
1759 | channel_garbage_collect(Channel *c) | |
1760 | { | |
1761 | if (c == NULL) | |
1762 | return; | |
1763 | if (c->detach_user != NULL) { | |
8cd0437d | 1764 | if (!chan_is_dead(c, c->detach_close)) |
418e724c | 1765 | return; |
d7ac5f18 | 1766 | debug2("channel %d: gc: notify user", c->self); |
418e724c | 1767 | c->detach_user(c->self, NULL); |
1768 | /* if we still have a callback */ | |
1769 | if (c->detach_user != NULL) | |
1770 | return; | |
d7ac5f18 | 1771 | debug2("channel %d: gc: user detached", c->self); |
418e724c | 1772 | } |
1773 | if (!chan_is_dead(c, 1)) | |
1774 | return; | |
d7ac5f18 | 1775 | debug2("channel %d: garbage collecting", c->self); |
418e724c | 1776 | channel_free(c); |
1777 | } | |
1778 | ||
396c147e | 1779 | static void |
c8e9c167 | 1780 | channel_handler(chan_fn *ftab[], fd_set *readset, fd_set *writeset) |
7368a6c8 | 1781 | { |
1782 | static int did_init = 0; | |
9a995072 | 1783 | u_int i; |
7368a6c8 | 1784 | Channel *c; |
1785 | ||
1786 | if (!did_init) { | |
1787 | channel_handler_init(); | |
1788 | did_init = 1; | |
1789 | } | |
1790 | for (i = 0; i < channels_alloc; i++) { | |
719fc62f | 1791 | c = channels[i]; |
1792 | if (c == NULL) | |
5260325f | 1793 | continue; |
6fd8622b | 1794 | if (ftab[c->type] != NULL) |
1795 | (*ftab[c->type])(c, readset, writeset); | |
418e724c | 1796 | channel_garbage_collect(c); |
8efc0c15 | 1797 | } |
8efc0c15 | 1798 | } |
1799 | ||
8e7895b8 | 1800 | /* |
1801 | * Allocate/update select bitmasks and add any bits relevant to channels in | |
1802 | * select bitmasks. | |
1803 | */ | |
6ae2364d | 1804 | void |
c422989b | 1805 | channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp, |
9a995072 | 1806 | u_int *nallocp, int rekeying) |
7368a6c8 | 1807 | { |
c5d10563 | 1808 | u_int n, sz, nfdset; |
39929cdb | 1809 | |
1810 | n = MAX(*maxfdp, channel_max_fd); | |
1811 | ||
c5d10563 | 1812 | nfdset = howmany(n+1, NFDBITS); |
1813 | /* Explicitly test here, because xrealloc isn't always called */ | |
1814 | if (nfdset && SIZE_T_MAX / nfdset < sizeof(fd_mask)) | |
1815 | fatal("channel_prepare_select: max_fd (%d) is too large", n); | |
1816 | sz = nfdset * sizeof(fd_mask); | |
1817 | ||
489aa2e9 | 1818 | /* perhaps check sz < nalloc/2 and shrink? */ |
1819 | if (*readsetp == NULL || sz > *nallocp) { | |
c5d10563 | 1820 | *readsetp = xrealloc(*readsetp, nfdset, sizeof(fd_mask)); |
1821 | *writesetp = xrealloc(*writesetp, nfdset, sizeof(fd_mask)); | |
489aa2e9 | 1822 | *nallocp = sz; |
39929cdb | 1823 | } |
489aa2e9 | 1824 | *maxfdp = n; |
39929cdb | 1825 | memset(*readsetp, 0, sz); |
1826 | memset(*writesetp, 0, sz); | |
1827 | ||
c422989b | 1828 | if (!rekeying) |
1829 | channel_handler(channel_pre, *readsetp, *writesetp); | |
7368a6c8 | 1830 | } |
1831 | ||
8e7895b8 | 1832 | /* |
1833 | * After select, perform any appropriate operations for channels which have | |
1834 | * events pending. | |
1835 | */ | |
6ae2364d | 1836 | void |
c8e9c167 | 1837 | channel_after_select(fd_set *readset, fd_set *writeset) |
7368a6c8 | 1838 | { |
1839 | channel_handler(channel_post, readset, writeset); | |
1840 | } | |
1841 | ||
8e7895b8 | 1842 | |
39929cdb | 1843 | /* If there is data to send to the connection, enqueue some of it now. */ |
6ae2364d | 1844 | void |
d5bb9418 | 1845 | channel_output_poll(void) |
8efc0c15 | 1846 | { |
7368a6c8 | 1847 | Channel *c; |
9a995072 | 1848 | u_int i, len; |
5260325f | 1849 | |
1850 | for (i = 0; i < channels_alloc; i++) { | |
719fc62f | 1851 | c = channels[i]; |
1852 | if (c == NULL) | |
1853 | continue; | |
48e671d5 | 1854 | |
8e7895b8 | 1855 | /* |
1856 | * We are only interested in channels that can have buffered | |
1857 | * incoming data. | |
1858 | */ | |
48e671d5 | 1859 | if (compat13) { |
7368a6c8 | 1860 | if (c->type != SSH_CHANNEL_OPEN && |
1861 | c->type != SSH_CHANNEL_INPUT_DRAINING) | |
48e671d5 | 1862 | continue; |
1863 | } else { | |
7368a6c8 | 1864 | if (c->type != SSH_CHANNEL_OPEN) |
48e671d5 | 1865 | continue; |
48e671d5 | 1866 | } |
e78a59f5 | 1867 | if (compat20 && |
1868 | (c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) { | |
ee55dacf | 1869 | /* XXX is this true? */ |
418e724c | 1870 | debug3("channel %d: will not send data after close", c->self); |
7e7327a1 | 1871 | continue; |
1872 | } | |
5260325f | 1873 | |
1874 | /* Get the amount of buffered data for this channel. */ | |
ee55dacf | 1875 | if ((c->istate == CHAN_INPUT_OPEN || |
1876 | c->istate == CHAN_INPUT_WAIT_DRAIN) && | |
1877 | (len = buffer_len(&c->input)) > 0) { | |
d20f3c9e | 1878 | if (c->datagram) { |
1879 | if (len > 0) { | |
1880 | u_char *data; | |
1881 | u_int dlen; | |
1882 | ||
1883 | data = buffer_get_string(&c->input, | |
1884 | &dlen); | |
1885 | packet_start(SSH2_MSG_CHANNEL_DATA); | |
1886 | packet_put_int(c->remote_id); | |
1887 | packet_put_string(data, dlen); | |
1888 | packet_send(); | |
1889 | c->remote_window -= dlen + 4; | |
1890 | xfree(data); | |
1891 | } | |
1892 | continue; | |
1893 | } | |
8e7895b8 | 1894 | /* |
1895 | * Send some data for the other side over the secure | |
1896 | * connection. | |
1897 | */ | |
7e7327a1 | 1898 | if (compat20) { |
1899 | if (len > c->remote_window) | |
1900 | len = c->remote_window; | |
1901 | if (len > c->remote_maxpacket) | |
1902 | len = c->remote_maxpacket; | |
5260325f | 1903 | } else { |
7e7327a1 | 1904 | if (packet_is_interactive()) { |
1905 | if (len > 1024) | |
1906 | len = 512; | |
1907 | } else { | |
1908 | /* Keep the packets at reasonable size. */ | |
1909 | if (len > packet_get_maxsize()/2) | |
1910 | len = packet_get_maxsize()/2; | |
1911 | } | |
5260325f | 1912 | } |
7368a6c8 | 1913 | if (len > 0) { |
7e7327a1 | 1914 | packet_start(compat20 ? |
1915 | SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA); | |
7368a6c8 | 1916 | packet_put_int(c->remote_id); |
1917 | packet_put_string(buffer_ptr(&c->input), len); | |
1918 | packet_send(); | |
1919 | buffer_consume(&c->input, len); | |
1920 | c->remote_window -= len; | |
7368a6c8 | 1921 | } |
1922 | } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) { | |
5260325f | 1923 | if (compat13) |
1924 | fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3"); | |
aa3378df | 1925 | /* |
1926 | * input-buffer is empty and read-socket shutdown: | |
d2296ed7 | 1927 | * tell peer, that we will not send more data: send IEOF. |
1928 | * hack for extended data: delay EOF if EFD still in use. | |
aa3378df | 1929 | */ |
d2296ed7 | 1930 | if (CHANNEL_EFD_INPUT_ACTIVE(c)) |
4e2e5cfd | 1931 | debug2("channel %d: ibuf_empty delayed efd %d/(%d)", |
1932 | c->self, c->efd, buffer_len(&c->extended)); | |
d2296ed7 | 1933 | else |
1934 | chan_ibuf_empty(c); | |
5260325f | 1935 | } |
7e7327a1 | 1936 | /* Send extended data, i.e. stderr */ |
1937 | if (compat20 && | |
d2296ed7 | 1938 | !(c->flags & CHAN_EOF_SENT) && |
7e7327a1 | 1939 | c->remote_window > 0 && |
1940 | (len = buffer_len(&c->extended)) > 0 && | |
1941 | c->extended_usage == CHAN_EXTENDED_READ) { | |
f91d9a89 | 1942 | debug2("channel %d: rwin %u elen %u euse %d", |
ee55dacf | 1943 | c->self, c->remote_window, buffer_len(&c->extended), |
1944 | c->extended_usage); | |
7e7327a1 | 1945 | if (len > c->remote_window) |
1946 | len = c->remote_window; | |
1947 | if (len > c->remote_maxpacket) | |
1948 | len = c->remote_maxpacket; | |
1949 | packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA); | |
1950 | packet_put_int(c->remote_id); | |
1951 | packet_put_int(SSH2_EXTENDED_DATA_STDERR); | |
1952 | packet_put_string(buffer_ptr(&c->extended), len); | |
1953 | packet_send(); | |
1954 | buffer_consume(&c->extended, len); | |
1955 | c->remote_window -= len; | |
ee55dacf | 1956 | debug2("channel %d: sent ext data %d", c->self, len); |
7e7327a1 | 1957 | } |
8efc0c15 | 1958 | } |
8efc0c15 | 1959 | } |
1960 | ||
8e7895b8 | 1961 | |
1962 | /* -- protocol input */ | |
04aa9e67 | 1963 | |
1964 | /* ARGSUSED */ | |
6ae2364d | 1965 | void |
7819b5c3 | 1966 | channel_input_data(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 1967 | { |
48e671d5 | 1968 | int id; |
5260325f | 1969 | char *data; |
1e3b8b07 | 1970 | u_int data_len; |
7368a6c8 | 1971 | Channel *c; |
5260325f | 1972 | |
1973 | /* Get the channel number and verify it. */ | |
48e671d5 | 1974 | id = packet_get_int(); |
7368a6c8 | 1975 | c = channel_lookup(id); |
1976 | if (c == NULL) | |
48e671d5 | 1977 | packet_disconnect("Received data for nonexistent channel %d.", id); |
5260325f | 1978 | |
1979 | /* Ignore any data for non-open channels (might happen on close) */ | |
7368a6c8 | 1980 | if (c->type != SSH_CHANNEL_OPEN && |
1981 | c->type != SSH_CHANNEL_X11_OPEN) | |
48e671d5 | 1982 | return; |
1983 | ||
5260325f | 1984 | /* Get the data. */ |
1985 | data = packet_get_string(&data_len); | |
7368a6c8 | 1986 | |
7741e239 | 1987 | /* |
1988 | * Ignore data for protocol > 1.3 if output end is no longer open. | |
1989 | * For protocol 2 the sending side is reducing its window as it sends | |
1990 | * data, so we must 'fake' consumption of the data in order to ensure | |
1991 | * that window updates are sent back. Otherwise the connection might | |
1992 | * deadlock. | |
1993 | */ | |
1994 | if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN) { | |
1995 | if (compat20) { | |
1996 | c->local_window -= data_len; | |
1997 | c->local_consumed += data_len; | |
1998 | } | |
1999 | xfree(data); | |
2000 | return; | |
2001 | } | |
2002 | ||
6aacefa7 | 2003 | if (compat20) { |
7e7327a1 | 2004 | if (data_len > c->local_maxpacket) { |
bbe88b6d | 2005 | logit("channel %d: rcvd big packet %d, maxpack %d", |
7e7327a1 | 2006 | c->self, data_len, c->local_maxpacket); |
2007 | } | |
2008 | if (data_len > c->local_window) { | |
bbe88b6d | 2009 | logit("channel %d: rcvd too much data %d, win %d", |
7e7327a1 | 2010 | c->self, data_len, c->local_window); |
2011 | xfree(data); | |
2012 | return; | |
2013 | } | |
2014 | c->local_window -= data_len; | |
7e7327a1 | 2015 | } |
95500969 | 2016 | packet_check_eom(); |
d20f3c9e | 2017 | if (c->datagram) |
2018 | buffer_put_string(&c->output, data, data_len); | |
2019 | else | |
2020 | buffer_append(&c->output, data, data_len); | |
5260325f | 2021 | xfree(data); |
8efc0c15 | 2022 | } |
8e7895b8 | 2023 | |
04aa9e67 | 2024 | /* ARGSUSED */ |
6ae2364d | 2025 | void |
7819b5c3 | 2026 | channel_input_extended_data(int type, u_int32_t seq, void *ctxt) |
7e7327a1 | 2027 | { |
2028 | int id; | |
7e7327a1 | 2029 | char *data; |
a594fa74 | 2030 | u_int data_len, tcode; |
7e7327a1 | 2031 | Channel *c; |
2032 | ||
2033 | /* Get the channel number and verify it. */ | |
2034 | id = packet_get_int(); | |
2035 | c = channel_lookup(id); | |
2036 | ||
2037 | if (c == NULL) | |
2038 | packet_disconnect("Received extended_data for bad channel %d.", id); | |
2039 | if (c->type != SSH_CHANNEL_OPEN) { | |
bbe88b6d | 2040 | logit("channel %d: ext data for non open", id); |
7e7327a1 | 2041 | return; |
2042 | } | |
d2296ed7 | 2043 | if (c->flags & CHAN_EOF_RCVD) { |
2044 | if (datafellows & SSH_BUG_EXTEOF) | |
2045 | debug("channel %d: accepting ext data after eof", id); | |
2046 | else | |
2047 | packet_disconnect("Received extended_data after EOF " | |
2048 | "on channel %d.", id); | |
2049 | } | |
7e7327a1 | 2050 | tcode = packet_get_int(); |
2051 | if (c->efd == -1 || | |
2052 | c->extended_usage != CHAN_EXTENDED_WRITE || | |
2053 | tcode != SSH2_EXTENDED_DATA_STDERR) { | |
bbe88b6d | 2054 | logit("channel %d: bad ext data", c->self); |
7e7327a1 | 2055 | return; |
2056 | } | |
2057 | data = packet_get_string(&data_len); | |
95500969 | 2058 | packet_check_eom(); |
7e7327a1 | 2059 | if (data_len > c->local_window) { |
bbe88b6d | 2060 | logit("channel %d: rcvd too much extended_data %d, win %d", |
7e7327a1 | 2061 | c->self, data_len, c->local_window); |
2062 | xfree(data); | |
2063 | return; | |
2064 | } | |
de273eef | 2065 | debug2("channel %d: rcvd ext data %d", c->self, data_len); |
7e7327a1 | 2066 | c->local_window -= data_len; |
2067 | buffer_append(&c->extended, data, data_len); | |
2068 | xfree(data); | |
2069 | } | |
2070 | ||
04aa9e67 | 2071 | /* ARGSUSED */ |
6ae2364d | 2072 | void |
7819b5c3 | 2073 | channel_input_ieof(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 2074 | { |
2075 | int id; | |
2076 | Channel *c; | |
2077 | ||
7368a6c8 | 2078 | id = packet_get_int(); |
95500969 | 2079 | packet_check_eom(); |
7368a6c8 | 2080 | c = channel_lookup(id); |
2081 | if (c == NULL) | |
2082 | packet_disconnect("Received ieof for nonexistent channel %d.", id); | |
2083 | chan_rcvd_ieof(c); | |
a5f82435 | 2084 | |
2085 | /* XXX force input close */ | |
8341f420 | 2086 | if (c->force_drain && c->istate == CHAN_INPUT_OPEN) { |
a5f82435 | 2087 | debug("channel %d: FORCE input drain", c->self); |
2088 | c->istate = CHAN_INPUT_WAIT_DRAIN; | |
32e7d71f | 2089 | if (buffer_len(&c->input) == 0) |
2090 | chan_ibuf_empty(c); | |
a5f82435 | 2091 | } |
2092 | ||
7368a6c8 | 2093 | } |
8efc0c15 | 2094 | |
04aa9e67 | 2095 | /* ARGSUSED */ |
6ae2364d | 2096 | void |
7819b5c3 | 2097 | channel_input_close(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2098 | { |
7368a6c8 | 2099 | int id; |
2100 | Channel *c; | |
5260325f | 2101 | |
7368a6c8 | 2102 | id = packet_get_int(); |
95500969 | 2103 | packet_check_eom(); |
7368a6c8 | 2104 | c = channel_lookup(id); |
2105 | if (c == NULL) | |
2106 | packet_disconnect("Received close for nonexistent channel %d.", id); | |
aa3378df | 2107 | |
2108 | /* | |
2109 | * Send a confirmation that we have closed the channel and no more | |
2110 | * data is coming for it. | |
2111 | */ | |
5260325f | 2112 | packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION); |
7368a6c8 | 2113 | packet_put_int(c->remote_id); |
5260325f | 2114 | packet_send(); |
2115 | ||
aa3378df | 2116 | /* |
2117 | * If the channel is in closed state, we have sent a close request, | |
2118 | * and the other side will eventually respond with a confirmation. | |
2119 | * Thus, we cannot free the channel here, because then there would be | |
2120 | * no-one to receive the confirmation. The channel gets freed when | |
2121 | * the confirmation arrives. | |
2122 | */ | |
7368a6c8 | 2123 | if (c->type != SSH_CHANNEL_CLOSED) { |
aa3378df | 2124 | /* |
2125 | * Not a closed channel - mark it as draining, which will | |
2126 | * cause it to be freed later. | |
2127 | */ | |
9c50edcf | 2128 | buffer_clear(&c->input); |
7368a6c8 | 2129 | c->type = SSH_CHANNEL_OUTPUT_DRAINING; |
5260325f | 2130 | } |
8efc0c15 | 2131 | } |
2132 | ||
7368a6c8 | 2133 | /* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */ |
04aa9e67 | 2134 | /* ARGSUSED */ |
6ae2364d | 2135 | void |
7819b5c3 | 2136 | channel_input_oclose(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2137 | { |
7368a6c8 | 2138 | int id = packet_get_int(); |
2139 | Channel *c = channel_lookup(id); | |
a8a21a53 | 2140 | |
95500969 | 2141 | packet_check_eom(); |
7368a6c8 | 2142 | if (c == NULL) |
2143 | packet_disconnect("Received oclose for nonexistent channel %d.", id); | |
2144 | chan_rcvd_oclose(c); | |
8efc0c15 | 2145 | } |
2146 | ||
04aa9e67 | 2147 | /* ARGSUSED */ |
6ae2364d | 2148 | void |
7819b5c3 | 2149 | channel_input_close_confirmation(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 2150 | { |
2151 | int id = packet_get_int(); | |
2152 | Channel *c = channel_lookup(id); | |
2153 | ||
95500969 | 2154 | packet_check_eom(); |
7368a6c8 | 2155 | if (c == NULL) |
2156 | packet_disconnect("Received close confirmation for " | |
2157 | "out-of-range channel %d.", id); | |
2158 | if (c->type != SSH_CHANNEL_CLOSED) | |
2159 | packet_disconnect("Received close confirmation for " | |
2160 | "non-closed channel %d (type %d).", id, c->type); | |
719fc62f | 2161 | channel_free(c); |
7368a6c8 | 2162 | } |
8efc0c15 | 2163 | |
04aa9e67 | 2164 | /* ARGSUSED */ |
6ae2364d | 2165 | void |
7819b5c3 | 2166 | channel_input_open_confirmation(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2167 | { |
7368a6c8 | 2168 | int id, remote_id; |
2169 | Channel *c; | |
5260325f | 2170 | |
7368a6c8 | 2171 | id = packet_get_int(); |
2172 | c = channel_lookup(id); | |
5260325f | 2173 | |
7368a6c8 | 2174 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) |
2175 | packet_disconnect("Received open confirmation for " | |
2176 | "non-opening channel %d.", id); | |
2177 | remote_id = packet_get_int(); | |
aa3378df | 2178 | /* Record the remote channel number and mark that the channel is now open. */ |
7368a6c8 | 2179 | c->remote_id = remote_id; |
2180 | c->type = SSH_CHANNEL_OPEN; | |
7e7327a1 | 2181 | |
2182 | if (compat20) { | |
2183 | c->remote_window = packet_get_int(); | |
2184 | c->remote_maxpacket = packet_get_int(); | |
05ca0898 | 2185 | if (c->confirm) { |
de273eef | 2186 | debug2("callback start"); |
5e96b616 | 2187 | c->confirm(c->self, c->confirm_ctx); |
de273eef | 2188 | debug2("callback done"); |
7e7327a1 | 2189 | } |
d7ac5f18 | 2190 | debug2("channel %d: open confirm rwindow %u rmax %u", c->self, |
7e7327a1 | 2191 | c->remote_window, c->remote_maxpacket); |
2192 | } | |
95500969 | 2193 | packet_check_eom(); |
8efc0c15 | 2194 | } |
2195 | ||
396c147e | 2196 | static char * |
d18e0850 | 2197 | reason2txt(int reason) |
2198 | { | |
6aacefa7 | 2199 | switch (reason) { |
d18e0850 | 2200 | case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED: |
2201 | return "administratively prohibited"; | |
2202 | case SSH2_OPEN_CONNECT_FAILED: | |
2203 | return "connect failed"; | |
2204 | case SSH2_OPEN_UNKNOWN_CHANNEL_TYPE: | |
2205 | return "unknown channel type"; | |
2206 | case SSH2_OPEN_RESOURCE_SHORTAGE: | |
2207 | return "resource shortage"; | |
2208 | } | |
7e8c18e9 | 2209 | return "unknown reason"; |
d18e0850 | 2210 | } |
2211 | ||
04aa9e67 | 2212 | /* ARGSUSED */ |
6ae2364d | 2213 | void |
7819b5c3 | 2214 | channel_input_open_failure(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2215 | { |
02a024dd | 2216 | int id, reason; |
2217 | char *msg = NULL, *lang = NULL; | |
7368a6c8 | 2218 | Channel *c; |
5260325f | 2219 | |
7368a6c8 | 2220 | id = packet_get_int(); |
2221 | c = channel_lookup(id); | |
2222 | ||
2223 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) | |
2224 | packet_disconnect("Received open failure for " | |
2225 | "non-opening channel %d.", id); | |
7e7327a1 | 2226 | if (compat20) { |
02a024dd | 2227 | reason = packet_get_int(); |
fbe90f7b | 2228 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { |
02a024dd | 2229 | msg = packet_get_string(NULL); |
2230 | lang = packet_get_string(NULL); | |
2231 | } | |
bbe88b6d | 2232 | logit("channel %d: open failed: %s%s%s", id, |
d18e0850 | 2233 | reason2txt(reason), msg ? ": ": "", msg ? msg : ""); |
02a024dd | 2234 | if (msg != NULL) |
2235 | xfree(msg); | |
2236 | if (lang != NULL) | |
2237 | xfree(lang); | |
7e7327a1 | 2238 | } |
95500969 | 2239 | packet_check_eom(); |
5260325f | 2240 | /* Free the channel. This will also close the socket. */ |
719fc62f | 2241 | channel_free(c); |
8efc0c15 | 2242 | } |
2243 | ||
04aa9e67 | 2244 | /* ARGSUSED */ |
8e7895b8 | 2245 | void |
7819b5c3 | 2246 | channel_input_window_adjust(int type, u_int32_t seq, void *ctxt) |
8e7895b8 | 2247 | { |
2248 | Channel *c; | |
f91d9a89 | 2249 | int id; |
2250 | u_int adjust; | |
3ffc6336 | 2251 | |
8e7895b8 | 2252 | if (!compat20) |
2253 | return; | |
8efc0c15 | 2254 | |
8e7895b8 | 2255 | /* Get the channel number and verify it. */ |
2256 | id = packet_get_int(); | |
2257 | c = channel_lookup(id); | |
2258 | ||
b872f7f0 | 2259 | if (c == NULL) { |
2260 | logit("Received window adjust for non-open channel %d.", id); | |
8e7895b8 | 2261 | return; |
2262 | } | |
2263 | adjust = packet_get_int(); | |
95500969 | 2264 | packet_check_eom(); |
f91d9a89 | 2265 | debug2("channel %d: rcvd adjust %u", id, adjust); |
8e7895b8 | 2266 | c->remote_window += adjust; |
2267 | } | |
2268 | ||
04aa9e67 | 2269 | /* ARGSUSED */ |
8e7895b8 | 2270 | void |
7819b5c3 | 2271 | channel_input_port_open(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2272 | { |
8e7895b8 | 2273 | Channel *c = NULL; |
2274 | u_short host_port; | |
2275 | char *host, *originator_string; | |
2276 | int remote_id, sock = -1; | |
5260325f | 2277 | |
8e7895b8 | 2278 | remote_id = packet_get_int(); |
2279 | host = packet_get_string(NULL); | |
2280 | host_port = packet_get_int(); | |
2281 | ||
2282 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) { | |
2283 | originator_string = packet_get_string(NULL); | |
2284 | } else { | |
2285 | originator_string = xstrdup("unknown (remote did not supply name)"); | |
2286 | } | |
95500969 | 2287 | packet_check_eom(); |
8e7895b8 | 2288 | sock = channel_connect_to(host, host_port); |
2289 | if (sock != -1) { | |
2290 | c = channel_new("connected socket", | |
2291 | SSH_CHANNEL_CONNECTING, sock, sock, -1, 0, 0, 0, | |
2292 | originator_string, 1); | |
3a0d3d54 | 2293 | c->remote_id = remote_id; |
5260325f | 2294 | } |
0d942eff | 2295 | xfree(originator_string); |
8e7895b8 | 2296 | if (c == NULL) { |
2297 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
2298 | packet_put_int(remote_id); | |
2299 | packet_send(); | |
2300 | } | |
2301 | xfree(host); | |
8efc0c15 | 2302 | } |
2303 | ||
8e7895b8 | 2304 | |
2305 | /* -- tcp forwarding */ | |
2306 | ||
5e4a7219 | 2307 | void |
2308 | channel_set_af(int af) | |
2309 | { | |
2310 | IPv4or6 = af; | |
2311 | } | |
2312 | ||
5641aefa | 2313 | static int |
2314 | channel_setup_fwd_listener(int type, const char *listen_addr, u_short listen_port, | |
2315 | const char *host_to_connect, u_short port_to_connect, int gateway_ports) | |
8efc0c15 | 2316 | { |
719fc62f | 2317 | Channel *c; |
442aee3a | 2318 | int sock, r, success = 0, wildcard = 0, is_client; |
48e671d5 | 2319 | struct addrinfo hints, *ai, *aitop; |
3867aa0a | 2320 | const char *host, *addr; |
5641aefa | 2321 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
5260325f | 2322 | |
5641aefa | 2323 | host = (type == SSH_CHANNEL_RPORT_LISTENER) ? |
2324 | listen_addr : host_to_connect; | |
3867aa0a | 2325 | is_client = (type == SSH_CHANNEL_PORT_LISTENER); |
02a024dd | 2326 | |
5641aefa | 2327 | if (host == NULL) { |
2328 | error("No forward host name."); | |
38946c65 | 2329 | return 0; |
fa08c86b | 2330 | } |
719fc62f | 2331 | if (strlen(host) > SSH_CHANNEL_PATH_LEN - 1) { |
02a024dd | 2332 | error("Forward host name too long."); |
38946c65 | 2333 | return 0; |
02a024dd | 2334 | } |
5260325f | 2335 | |
3867aa0a | 2336 | /* |
2337 | * Determine whether or not a port forward listens to loopback, | |
f8cc7664 | 2338 | * specified address or wildcard. On the client, a specified bind |
2339 | * address will always override gateway_ports. On the server, a | |
2340 | * gateway_ports of 1 (``yes'') will override the client's | |
2341 | * specification and force a wildcard bind, whereas a value of 2 | |
2342 | * (``clientspecified'') will bind to whatever address the client | |
3867aa0a | 2343 | * asked for. |
2344 | * | |
2345 | * Special-case listen_addrs are: | |
2346 | * | |
2347 | * "0.0.0.0" -> wildcard v4/v6 if SSH_OLD_FORWARD_ADDR | |
2348 | * "" (empty string), "*" -> wildcard v4/v6 | |
2349 | * "localhost" -> loopback v4/v6 | |
2350 | */ | |
2351 | addr = NULL; | |
2352 | if (listen_addr == NULL) { | |
2353 | /* No address specified: default to gateway_ports setting */ | |
2354 | if (gateway_ports) | |
2355 | wildcard = 1; | |
2356 | } else if (gateway_ports || is_client) { | |
2357 | if (((datafellows & SSH_OLD_FORWARD_ADDR) && | |
2358 | strcmp(listen_addr, "0.0.0.0") == 0) || | |
2359 | *listen_addr == '\0' || strcmp(listen_addr, "*") == 0 || | |
2360 | (!is_client && gateway_ports == 1)) | |
2361 | wildcard = 1; | |
2362 | else if (strcmp(listen_addr, "localhost") != 0) | |
2363 | addr = listen_addr; | |
2364 | } | |
2365 | ||
2366 | debug3("channel_setup_fwd_listener: type %d wildcard %d addr %s", | |
2367 | type, wildcard, (addr == NULL) ? "NULL" : addr); | |
2368 | ||
aa3378df | 2369 | /* |
48e671d5 | 2370 | * getaddrinfo returns a loopback address if the hostname is |
2371 | * set to NULL and hints.ai_flags is not AI_PASSIVE | |
aa3378df | 2372 | */ |
48e671d5 | 2373 | memset(&hints, 0, sizeof(hints)); |
2374 | hints.ai_family = IPv4or6; | |
3867aa0a | 2375 | hints.ai_flags = wildcard ? AI_PASSIVE : 0; |
48e671d5 | 2376 | hints.ai_socktype = SOCK_STREAM; |
fa08c86b | 2377 | snprintf(strport, sizeof strport, "%d", listen_port); |
3867aa0a | 2378 | if ((r = getaddrinfo(addr, strport, &hints, &aitop)) != 0) { |
2379 | if (addr == NULL) { | |
2380 | /* This really shouldn't happen */ | |
2381 | packet_disconnect("getaddrinfo: fatal error: %s", | |
2382 | gai_strerror(r)); | |
2383 | } else { | |
38946c65 | 2384 | error("channel_setup_fwd_listener: " |
3867aa0a | 2385 | "getaddrinfo(%.64s): %s", addr, gai_strerror(r)); |
2386 | } | |
38946c65 | 2387 | return 0; |
3867aa0a | 2388 | } |
48e671d5 | 2389 | |
48e671d5 | 2390 | for (ai = aitop; ai; ai = ai->ai_next) { |
2391 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
2392 | continue; | |
2393 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), | |
2394 | strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { | |
5641aefa | 2395 | error("channel_setup_fwd_listener: getnameinfo failed"); |
48e671d5 | 2396 | continue; |
2397 | } | |
2398 | /* Create a port to listen for the host. */ | |
3e131a6d | 2399 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
48e671d5 | 2400 | if (sock < 0) { |
2401 | /* this is no error since kernel may not support ipv6 */ | |
2402 | verbose("socket: %.100s", strerror(errno)); | |
2403 | continue; | |
2404 | } | |
442aee3a | 2405 | |
2406 | channel_set_reuseaddr(sock); | |
facfd613 | 2407 | |
48e671d5 | 2408 | debug("Local forwarding listening on %s port %s.", ntop, strport); |
2409 | ||
2410 | /* Bind the socket to the address. */ | |
2411 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { | |
2412 | /* address can be in use ipv6 address is already bound */ | |
16218745 | 2413 | if (!ai->ai_next) |
2414 | error("bind: %.100s", strerror(errno)); | |
2415 | else | |
2416 | verbose("bind: %.100s", strerror(errno)); | |
2b87da3b | 2417 | |
48e671d5 | 2418 | close(sock); |
2419 | continue; | |
2420 | } | |
2421 | /* Start listening for connections on the socket. */ | |
fce39749 | 2422 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { |
48e671d5 | 2423 | error("listen: %.100s", strerror(errno)); |
2424 | close(sock); | |
2425 | continue; | |
2426 | } | |
2427 | /* Allocate a channel number for the socket. */ | |
8e7895b8 | 2428 | c = channel_new("port listener", type, sock, sock, -1, |
0b242b12 | 2429 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, |
0d942eff | 2430 | 0, "port listener", 1); |
719fc62f | 2431 | strlcpy(c->path, host, sizeof(c->path)); |
2432 | c->host_port = port_to_connect; | |
2433 | c->listening_port = listen_port; | |
48e671d5 | 2434 | success = 1; |
2435 | } | |
2436 | if (success == 0) | |
5641aefa | 2437 | error("channel_setup_fwd_listener: cannot listen to port: %d", |
02a024dd | 2438 | listen_port); |
48e671d5 | 2439 | freeaddrinfo(aitop); |
02a024dd | 2440 | return success; |
5260325f | 2441 | } |
8efc0c15 | 2442 | |
d740ec16 | 2443 | int |
2444 | channel_cancel_rport_listener(const char *host, u_short port) | |
2445 | { | |
9a995072 | 2446 | u_int i; |
2447 | int found = 0; | |
d740ec16 | 2448 | |
f8cc7664 | 2449 | for (i = 0; i < channels_alloc; i++) { |
d740ec16 | 2450 | Channel *c = channels[i]; |
2451 | ||
2452 | if (c != NULL && c->type == SSH_CHANNEL_RPORT_LISTENER && | |
2453 | strncmp(c->path, host, sizeof(c->path)) == 0 && | |
f2107e97 | 2454 | c->listening_port == port) { |
2912cbd6 | 2455 | debug2("%s: close channel %d", __func__, i); |
d740ec16 | 2456 | channel_free(c); |
2457 | found = 1; | |
2458 | } | |
2459 | } | |
2460 | ||
2461 | return (found); | |
2462 | } | |
2463 | ||
5641aefa | 2464 | /* protocol local port fwd, used by ssh (and sshd in v1) */ |
2465 | int | |
3867aa0a | 2466 | channel_setup_local_fwd_listener(const char *listen_host, u_short listen_port, |
5641aefa | 2467 | const char *host_to_connect, u_short port_to_connect, int gateway_ports) |
2468 | { | |
2469 | return channel_setup_fwd_listener(SSH_CHANNEL_PORT_LISTENER, | |
3867aa0a | 2470 | listen_host, listen_port, host_to_connect, port_to_connect, |
2471 | gateway_ports); | |
5641aefa | 2472 | } |
2473 | ||
2474 | /* protocol v2 remote port fwd, used by sshd */ | |
2475 | int | |
2476 | channel_setup_remote_fwd_listener(const char *listen_address, | |
2477 | u_short listen_port, int gateway_ports) | |
2478 | { | |
2479 | return channel_setup_fwd_listener(SSH_CHANNEL_RPORT_LISTENER, | |
2480 | listen_address, listen_port, NULL, 0, gateway_ports); | |
2481 | } | |
2482 | ||
aa3378df | 2483 | /* |
2484 | * Initiate forwarding of connections to port "port" on remote host through | |
2485 | * the secure channel to host:port from local side. | |
2486 | */ | |
8efc0c15 | 2487 | |
42ea6f5e | 2488 | int |
3867aa0a | 2489 | channel_request_remote_forwarding(const char *listen_host, u_short listen_port, |
fa08c86b | 2490 | const char *host_to_connect, u_short port_to_connect) |
8efc0c15 | 2491 | { |
54a5250f | 2492 | int type, success = 0; |
fa08c86b | 2493 | |
5260325f | 2494 | /* Record locally that connection to this host/port is permitted. */ |
2495 | if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
2496 | fatal("channel_request_remote_forwarding: too many forwards"); | |
2497 | ||
5260325f | 2498 | /* Send the forward request to the remote side. */ |
7e7327a1 | 2499 | if (compat20) { |
3867aa0a | 2500 | const char *address_to_bind; |
2501 | if (listen_host == NULL) | |
2502 | address_to_bind = "localhost"; | |
2503 | else if (*listen_host == '\0' || strcmp(listen_host, "*") == 0) | |
2504 | address_to_bind = ""; | |
2505 | else | |
2506 | address_to_bind = listen_host; | |
2507 | ||
7e7327a1 | 2508 | packet_start(SSH2_MSG_GLOBAL_REQUEST); |
2509 | packet_put_cstring("tcpip-forward"); | |
e0ae8728 | 2510 | packet_put_char(1); /* boolean: want reply */ |
7e7327a1 | 2511 | packet_put_cstring(address_to_bind); |
2512 | packet_put_int(listen_port); | |
fa08c86b | 2513 | packet_send(); |
2514 | packet_write_wait(); | |
2515 | /* Assume that server accepts the request */ | |
2516 | success = 1; | |
7e7327a1 | 2517 | } else { |
2518 | packet_start(SSH_CMSG_PORT_FORWARD_REQUEST); | |
7e7327a1 | 2519 | packet_put_int(listen_port); |
d6f24e45 | 2520 | packet_put_cstring(host_to_connect); |
2521 | packet_put_int(port_to_connect); | |
7e7327a1 | 2522 | packet_send(); |
2523 | packet_write_wait(); | |
fa08c86b | 2524 | |
2525 | /* Wait for response from the remote side. */ | |
54a5250f | 2526 | type = packet_read(); |
fa08c86b | 2527 | switch (type) { |
2528 | case SSH_SMSG_SUCCESS: | |
2529 | success = 1; | |
2530 | break; | |
2531 | case SSH_SMSG_FAILURE: | |
fa08c86b | 2532 | break; |
2533 | default: | |
2534 | /* Unknown packet */ | |
2535 | packet_disconnect("Protocol error for port forward request:" | |
2536 | "received packet type %d.", type); | |
2537 | } | |
2538 | } | |
2539 | if (success) { | |
2540 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host_to_connect); | |
2541 | permitted_opens[num_permitted_opens].port_to_connect = port_to_connect; | |
2542 | permitted_opens[num_permitted_opens].listen_port = listen_port; | |
2543 | num_permitted_opens++; | |
7e7327a1 | 2544 | } |
42ea6f5e | 2545 | return (success ? 0 : -1); |
8efc0c15 | 2546 | } |
2547 | ||
d740ec16 | 2548 | /* |
f2107e97 | 2549 | * Request cancellation of remote forwarding of connection host:port from |
d740ec16 | 2550 | * local side. |
2551 | */ | |
d740ec16 | 2552 | void |
3867aa0a | 2553 | channel_request_rforward_cancel(const char *host, u_short port) |
d740ec16 | 2554 | { |
2555 | int i; | |
d740ec16 | 2556 | |
2557 | if (!compat20) | |
2558 | return; | |
2559 | ||
2560 | for (i = 0; i < num_permitted_opens; i++) { | |
f2107e97 | 2561 | if (permitted_opens[i].host_to_connect != NULL && |
d740ec16 | 2562 | permitted_opens[i].listen_port == port) |
2563 | break; | |
2564 | } | |
2565 | if (i >= num_permitted_opens) { | |
2566 | debug("%s: requested forward not found", __func__); | |
2567 | return; | |
2568 | } | |
2569 | packet_start(SSH2_MSG_GLOBAL_REQUEST); | |
2570 | packet_put_cstring("cancel-tcpip-forward"); | |
2571 | packet_put_char(0); | |
3867aa0a | 2572 | packet_put_cstring(host == NULL ? "" : host); |
d740ec16 | 2573 | packet_put_int(port); |
2574 | packet_send(); | |
2575 | ||
2576 | permitted_opens[i].listen_port = 0; | |
2577 | permitted_opens[i].port_to_connect = 0; | |
8c4bd764 | 2578 | xfree(permitted_opens[i].host_to_connect); |
d740ec16 | 2579 | permitted_opens[i].host_to_connect = NULL; |
2580 | } | |
2581 | ||
aa3378df | 2582 | /* |
2583 | * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates | |
2584 | * listening for the port, and sends back a success reply (or disconnect | |
42ea6f5e | 2585 | * message if there was an error). |
aa3378df | 2586 | */ |
42ea6f5e | 2587 | int |
1d1ffb87 | 2588 | channel_input_port_forward_request(int is_root, int gateway_ports) |
8efc0c15 | 2589 | { |
57112b5a | 2590 | u_short port, host_port; |
42ea6f5e | 2591 | int success = 0; |
5260325f | 2592 | char *hostname; |
2593 | ||
2594 | /* Get arguments from the packet. */ | |
2595 | port = packet_get_int(); | |
2596 | hostname = packet_get_string(NULL); | |
2597 | host_port = packet_get_int(); | |
2598 | ||
3c62e7eb | 2599 | #ifndef HAVE_CYGWIN |
aa3378df | 2600 | /* |
2601 | * Check that an unprivileged user is not trying to forward a | |
2602 | * privileged port. | |
2603 | */ | |
5260325f | 2604 | if (port < IPPORT_RESERVED && !is_root) |
8e7c9afc | 2605 | packet_disconnect( |
2606 | "Requested forwarding of port %d but user is not root.", | |
2607 | port); | |
2608 | if (host_port == 0) | |
2609 | packet_disconnect("Dynamic forwarding denied."); | |
3c62e7eb | 2610 | #endif |
8e7c9afc | 2611 | |
fa08c86b | 2612 | /* Initiate forwarding */ |
42ea6f5e | 2613 | success = channel_setup_local_fwd_listener(NULL, port, hostname, |
3867aa0a | 2614 | host_port, gateway_ports); |
5260325f | 2615 | |
2616 | /* Free the argument string. */ | |
2617 | xfree(hostname); | |
42ea6f5e | 2618 | |
2619 | return (success ? 0 : -1); | |
8efc0c15 | 2620 | } |
2621 | ||
01794848 | 2622 | /* |
2623 | * Permits opening to any host/port if permitted_opens[] is empty. This is | |
2624 | * usually called by the server, because the user could connect to any port | |
2625 | * anyway, and the server has no way to know but to trust the client anyway. | |
2626 | */ | |
2627 | void | |
d5bb9418 | 2628 | channel_permit_all_opens(void) |
01794848 | 2629 | { |
2630 | if (num_permitted_opens == 0) | |
2631 | all_opens_permitted = 1; | |
2632 | } | |
2633 | ||
cd332296 | 2634 | void |
01794848 | 2635 | channel_add_permitted_opens(char *host, int port) |
2636 | { | |
2637 | if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
42ea6f5e | 2638 | fatal("channel_add_permitted_opens: too many forwards"); |
01794848 | 2639 | debug("allow port forwarding to host %s port %d", host, port); |
2640 | ||
2641 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host); | |
2642 | permitted_opens[num_permitted_opens].port_to_connect = port; | |
2643 | num_permitted_opens++; | |
2644 | ||
2645 | all_opens_permitted = 0; | |
2646 | } | |
2647 | ||
cd332296 | 2648 | void |
01794848 | 2649 | channel_clear_permitted_opens(void) |
2650 | { | |
2651 | int i; | |
2652 | ||
2653 | for (i = 0; i < num_permitted_opens; i++) | |
d740ec16 | 2654 | if (permitted_opens[i].host_to_connect != NULL) |
2655 | xfree(permitted_opens[i].host_to_connect); | |
01794848 | 2656 | num_permitted_opens = 0; |
2657 | ||
2658 | } | |
2659 | ||
01794848 | 2660 | /* return socket to remote host, port */ |
396c147e | 2661 | static int |
01794848 | 2662 | connect_to(const char *host, u_short port) |
8efc0c15 | 2663 | { |
48e671d5 | 2664 | struct addrinfo hints, *ai, *aitop; |
2665 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; | |
2666 | int gaierr; | |
7368a6c8 | 2667 | int sock = -1; |
48e671d5 | 2668 | |
2669 | memset(&hints, 0, sizeof(hints)); | |
2670 | hints.ai_family = IPv4or6; | |
2671 | hints.ai_socktype = SOCK_STREAM; | |
01794848 | 2672 | snprintf(strport, sizeof strport, "%d", port); |
48e671d5 | 2673 | if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) { |
01794848 | 2674 | error("connect_to %.100s: unknown host (%s)", host, |
2675 | gai_strerror(gaierr)); | |
7368a6c8 | 2676 | return -1; |
48e671d5 | 2677 | } |
48e671d5 | 2678 | for (ai = aitop; ai; ai = ai->ai_next) { |
2679 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
2680 | continue; | |
2681 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), | |
2682 | strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { | |
01794848 | 2683 | error("connect_to: getnameinfo failed"); |
48e671d5 | 2684 | continue; |
5260325f | 2685 | } |
3e131a6d | 2686 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
48e671d5 | 2687 | if (sock < 0) { |
4940c411 | 2688 | if (ai->ai_next == NULL) |
2689 | error("socket: %.100s", strerror(errno)); | |
2690 | else | |
2691 | verbose("socket: %.100s", strerror(errno)); | |
48e671d5 | 2692 | continue; |
5260325f | 2693 | } |
170694d7 | 2694 | if (set_nonblock(sock) == -1) |
2695 | fatal("%s: set_nonblock(%d)", __func__, sock); | |
97fb6912 | 2696 | if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0 && |
2697 | errno != EINPROGRESS) { | |
01794848 | 2698 | error("connect_to %.100s port %s: %.100s", ntop, strport, |
48e671d5 | 2699 | strerror(errno)); |
2700 | close(sock); | |
2b87da3b | 2701 | continue; /* fail -- try next */ |
48e671d5 | 2702 | } |
2703 | break; /* success */ | |
5260325f | 2704 | |
5260325f | 2705 | } |
48e671d5 | 2706 | freeaddrinfo(aitop); |
48e671d5 | 2707 | if (!ai) { |
01794848 | 2708 | error("connect_to %.100s port %d: failed.", host, port); |
7368a6c8 | 2709 | return -1; |
8efc0c15 | 2710 | } |
7368a6c8 | 2711 | /* success */ |
811a6342 | 2712 | set_nodelay(sock); |
7368a6c8 | 2713 | return sock; |
2714 | } | |
01794848 | 2715 | |
fa08c86b | 2716 | int |
b3f8a79c | 2717 | channel_connect_by_listen_address(u_short listen_port) |
fa08c86b | 2718 | { |
2719 | int i; | |
01794848 | 2720 | |
fa08c86b | 2721 | for (i = 0; i < num_permitted_opens; i++) |
d740ec16 | 2722 | if (permitted_opens[i].host_to_connect != NULL && |
2723 | permitted_opens[i].listen_port == listen_port) | |
01794848 | 2724 | return connect_to( |
fa08c86b | 2725 | permitted_opens[i].host_to_connect, |
2726 | permitted_opens[i].port_to_connect); | |
0b6fbf03 | 2727 | error("WARNING: Server requests forwarding for unknown listen_port %d", |
2728 | listen_port); | |
fa08c86b | 2729 | return -1; |
2730 | } | |
48e671d5 | 2731 | |
01794848 | 2732 | /* Check if connecting to that port is permitted and connect. */ |
2733 | int | |
2734 | channel_connect_to(const char *host, u_short port) | |
2735 | { | |
2736 | int i, permit; | |
2737 | ||
2738 | permit = all_opens_permitted; | |
2739 | if (!permit) { | |
2740 | for (i = 0; i < num_permitted_opens; i++) | |
d740ec16 | 2741 | if (permitted_opens[i].host_to_connect != NULL && |
2742 | permitted_opens[i].port_to_connect == port && | |
01794848 | 2743 | strcmp(permitted_opens[i].host_to_connect, host) == 0) |
2744 | permit = 1; | |
2745 | ||
2746 | } | |
2747 | if (!permit) { | |
bbe88b6d | 2748 | logit("Received request to connect to host %.100s port %d, " |
01794848 | 2749 | "but the request was denied.", host, port); |
2750 | return -1; | |
2751 | } | |
2752 | return connect_to(host, port); | |
2753 | } | |
2754 | ||
5e96b616 | 2755 | void |
2756 | channel_send_window_changes(void) | |
2757 | { | |
9a995072 | 2758 | u_int i; |
5e96b616 | 2759 | struct winsize ws; |
2760 | ||
2761 | for (i = 0; i < channels_alloc; i++) { | |
f8cc7664 | 2762 | if (channels[i] == NULL || !channels[i]->client_tty || |
5e96b616 | 2763 | channels[i]->type != SSH_CHANNEL_OPEN) |
2764 | continue; | |
2765 | if (ioctl(channels[i]->rfd, TIOCGWINSZ, &ws) < 0) | |
2766 | continue; | |
2767 | channel_request_start(i, "window-change", 0); | |
148de80c | 2768 | packet_put_int((u_int)ws.ws_col); |
2769 | packet_put_int((u_int)ws.ws_row); | |
2770 | packet_put_int((u_int)ws.ws_xpixel); | |
2771 | packet_put_int((u_int)ws.ws_ypixel); | |
5e96b616 | 2772 | packet_send(); |
2773 | } | |
2774 | } | |
2775 | ||
8e7895b8 | 2776 | /* -- X11 forwarding */ |
8efc0c15 | 2777 | |
aa3378df | 2778 | /* |
2779 | * Creates an internet domain socket for listening for X11 connections. | |
57f228e8 | 2780 | * Returns 0 and a suitable display number for the DISPLAY variable |
2781 | * stored in display_numberp , or -1 if an error occurs. | |
aa3378df | 2782 | */ |
c9d0ad9b | 2783 | int |
e6e573bd | 2784 | x11_create_display_inet(int x11_display_offset, int x11_use_localhost, |
d08341e6 | 2785 | int single_connection, u_int *display_numberp, int **chanids) |
8efc0c15 | 2786 | { |
ac151b18 | 2787 | Channel *nc = NULL; |
57112b5a | 2788 | int display_number, sock; |
2789 | u_short port; | |
48e671d5 | 2790 | struct addrinfo hints, *ai, *aitop; |
2791 | char strport[NI_MAXSERV]; | |
2792 | int gaierr, n, num_socks = 0, socks[NUM_SOCKS]; | |
5260325f | 2793 | |
59e5aff5 | 2794 | if (chanids == NULL) |
2795 | return -1; | |
2796 | ||
95f1eccc | 2797 | for (display_number = x11_display_offset; |
184eed6a | 2798 | display_number < MAX_DISPLAYS; |
2799 | display_number++) { | |
5260325f | 2800 | port = 6000 + display_number; |
48e671d5 | 2801 | memset(&hints, 0, sizeof(hints)); |
2802 | hints.ai_family = IPv4or6; | |
e6e573bd | 2803 | hints.ai_flags = x11_use_localhost ? 0: AI_PASSIVE; |
48e671d5 | 2804 | hints.ai_socktype = SOCK_STREAM; |
2805 | snprintf(strport, sizeof strport, "%d", port); | |
2806 | if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) { | |
2807 | error("getaddrinfo: %.100s", gai_strerror(gaierr)); | |
c9d0ad9b | 2808 | return -1; |
5260325f | 2809 | } |
48e671d5 | 2810 | for (ai = aitop; ai; ai = ai->ai_next) { |
2811 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
2812 | continue; | |
3e131a6d | 2813 | sock = socket(ai->ai_family, ai->ai_socktype, |
2814 | ai->ai_protocol); | |
48e671d5 | 2815 | if (sock < 0) { |
4ee81249 | 2816 | if ((errno != EINVAL) && (errno != EAFNOSUPPORT)) { |
80a44451 | 2817 | error("socket: %.100s", strerror(errno)); |
0ea89f7e | 2818 | freeaddrinfo(aitop); |
c9d0ad9b | 2819 | return -1; |
80a44451 | 2820 | } else { |
22d89d24 | 2821 | debug("x11_create_display_inet: Socket family %d not supported", |
2822 | ai->ai_family); | |
80a44451 | 2823 | continue; |
2824 | } | |
48e671d5 | 2825 | } |
688aaeda | 2826 | #ifdef IPV6_V6ONLY |
2827 | if (ai->ai_family == AF_INET6) { | |
2828 | int on = 1; | |
2829 | if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) < 0) | |
2830 | error("setsockopt IPV6_V6ONLY: %.100s", strerror(errno)); | |
2831 | } | |
2832 | #endif | |
442aee3a | 2833 | channel_set_reuseaddr(sock); |
48e671d5 | 2834 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { |
d7ac5f18 | 2835 | debug2("bind port %d: %.100s", port, strerror(errno)); |
48e671d5 | 2836 | close(sock); |
16218745 | 2837 | |
2838 | if (ai->ai_next) | |
2839 | continue; | |
2840 | ||
48e671d5 | 2841 | for (n = 0; n < num_socks; n++) { |
48e671d5 | 2842 | close(socks[n]); |
2843 | } | |
2844 | num_socks = 0; | |
2845 | break; | |
2846 | } | |
2847 | socks[num_socks++] = sock; | |
80faa19f | 2848 | #ifndef DONT_TRY_OTHER_AF |
48e671d5 | 2849 | if (num_socks == NUM_SOCKS) |
2850 | break; | |
80faa19f | 2851 | #else |
688aaeda | 2852 | if (x11_use_localhost) { |
2853 | if (num_socks == NUM_SOCKS) | |
2854 | break; | |
2855 | } else { | |
2856 | break; | |
2857 | } | |
80faa19f | 2858 | #endif |
5260325f | 2859 | } |
4ccb01d6 | 2860 | freeaddrinfo(aitop); |
48e671d5 | 2861 | if (num_socks > 0) |
2862 | break; | |
5260325f | 2863 | } |
2864 | if (display_number >= MAX_DISPLAYS) { | |
2865 | error("Failed to allocate internet-domain X11 display socket."); | |
c9d0ad9b | 2866 | return -1; |
8efc0c15 | 2867 | } |
5260325f | 2868 | /* Start listening for connections on the socket. */ |
48e671d5 | 2869 | for (n = 0; n < num_socks; n++) { |
2870 | sock = socks[n]; | |
fce39749 | 2871 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { |
48e671d5 | 2872 | error("listen: %.100s", strerror(errno)); |
48e671d5 | 2873 | close(sock); |
c9d0ad9b | 2874 | return -1; |
a7effaac | 2875 | } |
a7effaac | 2876 | } |
5260325f | 2877 | |
48e671d5 | 2878 | /* Allocate a channel for each socket. */ |
52e3daed | 2879 | *chanids = xcalloc(num_socks + 1, sizeof(**chanids)); |
48e671d5 | 2880 | for (n = 0; n < num_socks; n++) { |
2881 | sock = socks[n]; | |
ac151b18 | 2882 | nc = channel_new("x11 listener", |
0b242b12 | 2883 | SSH_CHANNEL_X11_LISTENER, sock, sock, -1, |
2884 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, | |
0d942eff | 2885 | 0, "X11 inet listener", 1); |
3a0d3d54 | 2886 | nc->single_connection = single_connection; |
59e5aff5 | 2887 | (*chanids)[n] = nc->self; |
48e671d5 | 2888 | } |
59e5aff5 | 2889 | (*chanids)[n] = -1; |
5260325f | 2890 | |
c9d0ad9b | 2891 | /* Return the display number for the DISPLAY environment variable. */ |
57f228e8 | 2892 | *display_numberp = display_number; |
2893 | return (0); | |
8efc0c15 | 2894 | } |
2895 | ||
396c147e | 2896 | static int |
1e3b8b07 | 2897 | connect_local_xsocket(u_int dnr) |
8efc0c15 | 2898 | { |
5260325f | 2899 | int sock; |
2900 | struct sockaddr_un addr; | |
5260325f | 2901 | |
805e659f | 2902 | sock = socket(AF_UNIX, SOCK_STREAM, 0); |
2903 | if (sock < 0) | |
2904 | error("socket: %.100s", strerror(errno)); | |
2905 | memset(&addr, 0, sizeof(addr)); | |
2906 | addr.sun_family = AF_UNIX; | |
2907 | snprintf(addr.sun_path, sizeof addr.sun_path, _PATH_UNIX_X, dnr); | |
32596c7b | 2908 | if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) == 0) |
805e659f | 2909 | return sock; |
2910 | close(sock); | |
5260325f | 2911 | error("connect %.100s: %.100s", addr.sun_path, strerror(errno)); |
2912 | return -1; | |
8efc0c15 | 2913 | } |
2914 | ||
0b242b12 | 2915 | int |
2916 | x11_connect_display(void) | |
8efc0c15 | 2917 | { |
4f16046f | 2918 | u_int display_number; |
5260325f | 2919 | const char *display; |
0b242b12 | 2920 | char buf[1024], *cp; |
48e671d5 | 2921 | struct addrinfo hints, *ai, *aitop; |
2922 | char strport[NI_MAXSERV]; | |
4f16046f | 2923 | int gaierr, sock = 0; |
5260325f | 2924 | |
5260325f | 2925 | /* Try to open a socket for the local X server. */ |
2926 | display = getenv("DISPLAY"); | |
2927 | if (!display) { | |
2928 | error("DISPLAY not set."); | |
0b242b12 | 2929 | return -1; |
5260325f | 2930 | } |
aa3378df | 2931 | /* |
2932 | * Now we decode the value of the DISPLAY variable and make a | |
2933 | * connection to the real X server. | |
2934 | */ | |
2935 | ||
2936 | /* | |
2937 | * Check if it is a unix domain socket. Unix domain displays are in | |
2938 | * one of the following formats: unix:d[.s], :d[.s], ::d[.s] | |
2939 | */ | |
5260325f | 2940 | if (strncmp(display, "unix:", 5) == 0 || |
2941 | display[0] == ':') { | |
2942 | /* Connect to the unix domain socket. */ | |
4f16046f | 2943 | if (sscanf(strrchr(display, ':') + 1, "%u", &display_number) != 1) { |
5260325f | 2944 | error("Could not parse display number from DISPLAY: %.100s", |
184eed6a | 2945 | display); |
0b242b12 | 2946 | return -1; |
5260325f | 2947 | } |
2948 | /* Create a socket. */ | |
2949 | sock = connect_local_xsocket(display_number); | |
2950 | if (sock < 0) | |
0b242b12 | 2951 | return -1; |
5260325f | 2952 | |
2953 | /* OK, we now have a connection to the display. */ | |
0b242b12 | 2954 | return sock; |
5260325f | 2955 | } |
aa3378df | 2956 | /* |
2957 | * Connect to an inet socket. The DISPLAY value is supposedly | |
2958 | * hostname:d[.s], where hostname may also be numeric IP address. | |
2959 | */ | |
74860245 | 2960 | strlcpy(buf, display, sizeof(buf)); |
5260325f | 2961 | cp = strchr(buf, ':'); |
2962 | if (!cp) { | |
2963 | error("Could not find ':' in DISPLAY: %.100s", display); | |
0b242b12 | 2964 | return -1; |
5260325f | 2965 | } |
2966 | *cp = 0; | |
aa3378df | 2967 | /* buf now contains the host name. But first we parse the display number. */ |
4f16046f | 2968 | if (sscanf(cp + 1, "%u", &display_number) != 1) { |
5260325f | 2969 | error("Could not parse display number from DISPLAY: %.100s", |
184eed6a | 2970 | display); |
0b242b12 | 2971 | return -1; |
5260325f | 2972 | } |
5260325f | 2973 | |
48e671d5 | 2974 | /* Look up the host address */ |
2975 | memset(&hints, 0, sizeof(hints)); | |
2976 | hints.ai_family = IPv4or6; | |
2977 | hints.ai_socktype = SOCK_STREAM; | |
4f16046f | 2978 | snprintf(strport, sizeof strport, "%u", 6000 + display_number); |
48e671d5 | 2979 | if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) { |
2980 | error("%.100s: unknown host. (%s)", buf, gai_strerror(gaierr)); | |
0b242b12 | 2981 | return -1; |
8efc0c15 | 2982 | } |
48e671d5 | 2983 | for (ai = aitop; ai; ai = ai->ai_next) { |
2984 | /* Create a socket. */ | |
3e131a6d | 2985 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
48e671d5 | 2986 | if (sock < 0) { |
d7ac5f18 | 2987 | debug2("socket: %.100s", strerror(errno)); |
7368a6c8 | 2988 | continue; |
2989 | } | |
2990 | /* Connect it to the display. */ | |
2991 | if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) { | |
4f16046f | 2992 | debug2("connect %.100s port %u: %.100s", buf, |
7368a6c8 | 2993 | 6000 + display_number, strerror(errno)); |
2994 | close(sock); | |
2995 | continue; | |
2996 | } | |
2997 | /* Success */ | |
2998 | break; | |
48e671d5 | 2999 | } |
48e671d5 | 3000 | freeaddrinfo(aitop); |
3001 | if (!ai) { | |
4f16046f | 3002 | error("connect %.100s port %u: %.100s", buf, 6000 + display_number, |
48e671d5 | 3003 | strerror(errno)); |
0b242b12 | 3004 | return -1; |
8efc0c15 | 3005 | } |
bcc0381e | 3006 | set_nodelay(sock); |
0b242b12 | 3007 | return sock; |
3008 | } | |
5260325f | 3009 | |
0b242b12 | 3010 | /* |
3011 | * This is called when SSH_SMSG_X11_OPEN is received. The packet contains | |
3012 | * the remote channel number. We should do whatever we want, and respond | |
3013 | * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE. | |
3014 | */ | |
5260325f | 3015 | |
0b242b12 | 3016 | void |
7819b5c3 | 3017 | x11_input_open(int type, u_int32_t seq, void *ctxt) |
0b242b12 | 3018 | { |
719fc62f | 3019 | Channel *c = NULL; |
3020 | int remote_id, sock = 0; | |
0b242b12 | 3021 | char *remote_host; |
5260325f | 3022 | |
719fc62f | 3023 | debug("Received X11 open request."); |
5260325f | 3024 | |
719fc62f | 3025 | remote_id = packet_get_int(); |
8e7895b8 | 3026 | |
3027 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) { | |
719fc62f | 3028 | remote_host = packet_get_string(NULL); |
0b242b12 | 3029 | } else { |
3030 | remote_host = xstrdup("unknown (remote did not supply name)"); | |
0b242b12 | 3031 | } |
95500969 | 3032 | packet_check_eom(); |
0b242b12 | 3033 | |
3034 | /* Obtain a connection to the real X display. */ | |
3035 | sock = x11_connect_display(); | |
719fc62f | 3036 | if (sock != -1) { |
3037 | /* Allocate a channel for this connection. */ | |
3038 | c = channel_new("connected x11 socket", | |
3039 | SSH_CHANNEL_X11_OPEN, sock, sock, -1, 0, 0, 0, | |
3040 | remote_host, 1); | |
3a0d3d54 | 3041 | c->remote_id = remote_id; |
3042 | c->force_drain = 1; | |
719fc62f | 3043 | } |
0d942eff | 3044 | xfree(remote_host); |
719fc62f | 3045 | if (c == NULL) { |
0b242b12 | 3046 | /* Send refusal to the remote host. */ |
3047 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
719fc62f | 3048 | packet_put_int(remote_id); |
0b242b12 | 3049 | } else { |
0b242b12 | 3050 | /* Send a confirmation to the remote host. */ |
3051 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
719fc62f | 3052 | packet_put_int(remote_id); |
3053 | packet_put_int(c->self); | |
0b242b12 | 3054 | } |
719fc62f | 3055 | packet_send(); |
8efc0c15 | 3056 | } |
3057 | ||
a22aff1f | 3058 | /* dummy protocol handler that denies SSH-1 requests (agent/x11) */ |
3059 | void | |
7819b5c3 | 3060 | deny_input_open(int type, u_int32_t seq, void *ctxt) |
a22aff1f | 3061 | { |
3062 | int rchan = packet_get_int(); | |
e1feb9bf | 3063 | |
6aacefa7 | 3064 | switch (type) { |
a22aff1f | 3065 | case SSH_SMSG_AGENT_OPEN: |
3066 | error("Warning: ssh server tried agent forwarding."); | |
3067 | break; | |
3068 | case SSH_SMSG_X11_OPEN: | |
3069 | error("Warning: ssh server tried X11 forwarding."); | |
3070 | break; | |
3071 | default: | |
7819b5c3 | 3072 | error("deny_input_open: type %d", type); |
a22aff1f | 3073 | break; |
3074 | } | |
1908529f | 3075 | error("Warning: this is probably a break-in attempt by a malicious server."); |
a22aff1f | 3076 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
3077 | packet_put_int(rchan); | |
3078 | packet_send(); | |
3079 | } | |
3080 | ||
aa3378df | 3081 | /* |
3082 | * Requests forwarding of X11 connections, generates fake authentication | |
3083 | * data, and enables authentication spoofing. | |
8e7895b8 | 3084 | * This should be called in the client only. |
aa3378df | 3085 | */ |
6ae2364d | 3086 | void |
9bf083eb | 3087 | x11_request_forwarding_with_spoofing(int client_session_id, const char *disp, |
0b242b12 | 3088 | const char *proto, const char *data) |
8efc0c15 | 3089 | { |
1e3b8b07 | 3090 | u_int data_len = (u_int) strlen(data) / 2; |
ef07103c | 3091 | u_int i, value; |
5260325f | 3092 | char *new_data; |
3093 | int screen_number; | |
3094 | const char *cp; | |
ca75d7de | 3095 | u_int32_t rnd = 0; |
5260325f | 3096 | |
4297b666 | 3097 | if (x11_saved_display == NULL) |
3098 | x11_saved_display = xstrdup(disp); | |
3099 | else if (strcmp(disp, x11_saved_display) != 0) { | |
ef07103c | 3100 | error("x11_request_forwarding_with_spoofing: different " |
3101 | "$DISPLAY already forwarded"); | |
3102 | return; | |
3103 | } | |
3104 | ||
9bf083eb | 3105 | cp = disp; |
3106 | if (disp) | |
3107 | cp = strchr(disp, ':'); | |
5260325f | 3108 | if (cp) |
3109 | cp = strchr(cp, '.'); | |
3110 | if (cp) | |
d6d4897e | 3111 | screen_number = (u_int)strtonum(cp + 1, 0, 400, NULL); |
5260325f | 3112 | else |
3113 | screen_number = 0; | |
3114 | ||
ef07103c | 3115 | if (x11_saved_proto == NULL) { |
3116 | /* Save protocol name. */ | |
3117 | x11_saved_proto = xstrdup(proto); | |
3118 | /* | |
56964485 | 3119 | * Extract real authentication data and generate fake data |
ef07103c | 3120 | * of the same length. |
3121 | */ | |
3122 | x11_saved_data = xmalloc(data_len); | |
3123 | x11_fake_data = xmalloc(data_len); | |
3124 | for (i = 0; i < data_len; i++) { | |
3125 | if (sscanf(data + 2 * i, "%2x", &value) != 1) | |
3126 | fatal("x11_request_forwarding: bad " | |
3127 | "authentication data: %.100s", data); | |
3128 | if (i % 4 == 0) | |
3129 | rnd = arc4random(); | |
3130 | x11_saved_data[i] = value; | |
3131 | x11_fake_data[i] = rnd & 0xff; | |
3132 | rnd >>= 8; | |
3133 | } | |
3134 | x11_saved_data_len = data_len; | |
3135 | x11_fake_data_len = data_len; | |
3136 | } | |
5260325f | 3137 | |
3138 | /* Convert the fake data into hex. */ | |
ef07103c | 3139 | new_data = tohex(x11_fake_data, data_len); |
5260325f | 3140 | |
3141 | /* Send the request packet. */ | |
0b242b12 | 3142 | if (compat20) { |
3143 | channel_request_start(client_session_id, "x11-req", 0); | |
3144 | packet_put_char(0); /* XXX bool single connection */ | |
3145 | } else { | |
3146 | packet_start(SSH_CMSG_X11_REQUEST_FORWARDING); | |
3147 | } | |
3148 | packet_put_cstring(proto); | |
3149 | packet_put_cstring(new_data); | |
5260325f | 3150 | packet_put_int(screen_number); |
3151 | packet_send(); | |
3152 | packet_write_wait(); | |
3153 | xfree(new_data); | |
8efc0c15 | 3154 | } |
3155 | ||
8e7895b8 | 3156 | |
3157 | /* -- agent forwarding */ | |
3158 | ||
8efc0c15 | 3159 | /* Sends a message to the server to request authentication fd forwarding. */ |
3160 | ||
6ae2364d | 3161 | void |
d5bb9418 | 3162 | auth_request_forwarding(void) |
8efc0c15 | 3163 | { |
5260325f | 3164 | packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING); |
3165 | packet_send(); | |
3166 | packet_write_wait(); | |
8efc0c15 | 3167 | } |