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5188ba17 | 1 | /* $OpenBSD: channels.c,v 1.256 2006/07/17 01:31:09 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> |
5188ba17 | 57 | #include <unistd.h> |
8efc0c15 | 58 | |
59 | #include "ssh.h" | |
42f11eb2 | 60 | #include "ssh1.h" |
61 | #include "ssh2.h" | |
8efc0c15 | 62 | #include "packet.h" |
63 | #include "xmalloc.h" | |
42f11eb2 | 64 | #include "log.h" |
65 | #include "misc.h" | |
8efc0c15 | 66 | #include "channels.h" |
8efc0c15 | 67 | #include "compat.h" |
42f11eb2 | 68 | #include "canohost.h" |
4c8722d9 | 69 | #include "key.h" |
70 | #include "authfd.h" | |
805e659f | 71 | #include "pathnames.h" |
f49658f5 | 72 | #include "bufaux.h" |
8efc0c15 | 73 | |
8e7895b8 | 74 | /* -- channel core */ |
8efc0c15 | 75 | |
aa3378df | 76 | /* |
77 | * Pointer to an array containing all allocated channels. The array is | |
78 | * dynamically extended as needed. | |
79 | */ | |
719fc62f | 80 | static Channel **channels = NULL; |
8efc0c15 | 81 | |
aa3378df | 82 | /* |
83 | * Size of the channel array. All slots of the array must always be | |
719fc62f | 84 | * initialized (at least the type field); unused slots set to NULL |
aa3378df | 85 | */ |
9a995072 | 86 | static u_int channels_alloc = 0; |
8efc0c15 | 87 | |
aa3378df | 88 | /* |
89 | * Maximum file descriptor value used in any of the channels. This is | |
719fc62f | 90 | * updated in channel_new. |
aa3378df | 91 | */ |
39929cdb | 92 | static int channel_max_fd = 0; |
8efc0c15 | 93 | |
8efc0c15 | 94 | |
8e7895b8 | 95 | /* -- tcp forwarding */ |
8efc0c15 | 96 | |
aa3378df | 97 | /* |
98 | * Data structure for storing which hosts are permitted for forward requests. | |
99 | * The local sides of any remote forwards are stored in this array to prevent | |
100 | * a corrupt remote server from accessing arbitrary TCP/IP ports on our local | |
101 | * network (which might be behind a firewall). | |
102 | */ | |
5260325f | 103 | typedef struct { |
7368a6c8 | 104 | char *host_to_connect; /* Connect to 'host'. */ |
105 | u_short port_to_connect; /* Connect to 'port'. */ | |
106 | u_short listen_port; /* Remote side should listen port number. */ | |
8efc0c15 | 107 | } ForwardPermission; |
108 | ||
109 | /* List of all permitted host/port pairs to connect. */ | |
110 | static ForwardPermission permitted_opens[SSH_MAX_FORWARDS_PER_DIRECTION]; | |
8e7895b8 | 111 | |
8efc0c15 | 112 | /* Number of permitted host/port pairs in the array. */ |
113 | static int num_permitted_opens = 0; | |
aa3378df | 114 | /* |
115 | * If this is true, all opens are permitted. This is the case on the server | |
116 | * on which we have to trust the client anyway, and the user could do | |
117 | * anything after logging in anyway. | |
118 | */ | |
8efc0c15 | 119 | static int all_opens_permitted = 0; |
120 | ||
8efc0c15 | 121 | |
8e7895b8 | 122 | /* -- X11 forwarding */ |
42f11eb2 | 123 | |
8e7895b8 | 124 | /* Maximum number of fake X11 displays to try. */ |
125 | #define MAX_DISPLAYS 1000 | |
0490e609 | 126 | |
ef07103c | 127 | /* Saved X11 local (client) display. */ |
128 | static char *x11_saved_display = NULL; | |
129 | ||
8e7895b8 | 130 | /* Saved X11 authentication protocol name. */ |
131 | static char *x11_saved_proto = NULL; | |
8efc0c15 | 132 | |
8e7895b8 | 133 | /* Saved X11 authentication data. This is the real data. */ |
134 | static char *x11_saved_data = NULL; | |
135 | static u_int x11_saved_data_len = 0; | |
136 | ||
137 | /* | |
138 | * Fake X11 authentication data. This is what the server will be sending us; | |
139 | * we should replace any occurrences of this by the real data. | |
140 | */ | |
338eb2ab | 141 | static u_char *x11_fake_data = NULL; |
8e7895b8 | 142 | static u_int x11_fake_data_len; |
143 | ||
144 | ||
145 | /* -- agent forwarding */ | |
8efc0c15 | 146 | |
8e7895b8 | 147 | #define NUM_SOCKS 10 |
148 | ||
8e7895b8 | 149 | /* AF_UNSPEC or AF_INET or AF_INET6 */ |
5e4a7219 | 150 | static int IPv4or6 = AF_UNSPEC; |
8e7895b8 | 151 | |
152 | /* helper */ | |
396c147e | 153 | static void port_open_helper(Channel *c, char *rtype); |
8e7895b8 | 154 | |
155 | /* -- channel core */ | |
7368a6c8 | 156 | |
157 | Channel * | |
b872f7f0 | 158 | channel_by_id(int id) |
7368a6c8 | 159 | { |
160 | Channel *c; | |
719fc62f | 161 | |
9a995072 | 162 | if (id < 0 || (u_int)id >= channels_alloc) { |
b872f7f0 | 163 | logit("channel_by_id: %d: bad id", id); |
7368a6c8 | 164 | return NULL; |
165 | } | |
719fc62f | 166 | c = channels[id]; |
167 | if (c == NULL) { | |
b872f7f0 | 168 | logit("channel_by_id: %d: bad id: channel free", id); |
7368a6c8 | 169 | return NULL; |
170 | } | |
171 | return c; | |
172 | } | |
173 | ||
b872f7f0 | 174 | /* |
175 | * Returns the channel if it is allowed to receive protocol messages. | |
176 | * Private channels, like listening sockets, may not receive messages. | |
177 | */ | |
178 | Channel * | |
179 | channel_lookup(int id) | |
180 | { | |
181 | Channel *c; | |
182 | ||
183 | if ((c = channel_by_id(id)) == NULL) | |
184 | return (NULL); | |
185 | ||
c8e9c167 | 186 | switch (c->type) { |
b872f7f0 | 187 | case SSH_CHANNEL_X11_OPEN: |
188 | case SSH_CHANNEL_LARVAL: | |
189 | case SSH_CHANNEL_CONNECTING: | |
190 | case SSH_CHANNEL_DYNAMIC: | |
191 | case SSH_CHANNEL_OPENING: | |
192 | case SSH_CHANNEL_OPEN: | |
193 | case SSH_CHANNEL_INPUT_DRAINING: | |
194 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
195 | return (c); | |
b872f7f0 | 196 | } |
197 | logit("Non-public channel %d, type %d.", id, c->type); | |
198 | return (NULL); | |
199 | } | |
200 | ||
aa3378df | 201 | /* |
1d1ffb87 | 202 | * Register filedescriptors for a channel, used when allocating a channel or |
0fbe8c74 | 203 | * when the channel consumer/producer is ready, e.g. shell exec'd |
aa3378df | 204 | */ |
396c147e | 205 | static void |
a22aff1f | 206 | channel_register_fds(Channel *c, int rfd, int wfd, int efd, |
207 | int extusage, int nonblock) | |
8efc0c15 | 208 | { |
5260325f | 209 | /* Update the maximum file descriptor value. */ |
39929cdb | 210 | channel_max_fd = MAX(channel_max_fd, rfd); |
211 | channel_max_fd = MAX(channel_max_fd, wfd); | |
212 | channel_max_fd = MAX(channel_max_fd, efd); | |
213 | ||
aa3378df | 214 | /* XXX set close-on-exec -markus */ |
1d1ffb87 | 215 | |
0fbe8c74 | 216 | c->rfd = rfd; |
217 | c->wfd = wfd; | |
218 | c->sock = (rfd == wfd) ? rfd : -1; | |
5e96b616 | 219 | c->ctl_fd = -1; /* XXX: set elsewhere */ |
0fbe8c74 | 220 | c->efd = efd; |
221 | c->extended_usage = extusage; | |
a22aff1f | 222 | |
0ae4fe1d | 223 | /* XXX ugly hack: nonblock is only set by the server */ |
224 | if (nonblock && isatty(c->rfd)) { | |
d7ac5f18 | 225 | debug2("channel %d: rfd %d isatty", c->self, c->rfd); |
0ae4fe1d | 226 | c->isatty = 1; |
227 | if (!isatty(c->wfd)) { | |
94dfb550 | 228 | error("channel %d: wfd %d is not a tty?", |
0ae4fe1d | 229 | c->self, c->wfd); |
230 | } | |
231 | } else { | |
232 | c->isatty = 0; | |
233 | } | |
21c2c5cd | 234 | c->wfd_isatty = isatty(c->wfd); |
0ae4fe1d | 235 | |
a22aff1f | 236 | /* enable nonblocking mode */ |
237 | if (nonblock) { | |
238 | if (rfd != -1) | |
239 | set_nonblock(rfd); | |
240 | if (wfd != -1) | |
241 | set_nonblock(wfd); | |
242 | if (efd != -1) | |
243 | set_nonblock(efd); | |
244 | } | |
0fbe8c74 | 245 | } |
246 | ||
247 | /* | |
248 | * Allocate a new channel object and set its type and socket. This will cause | |
249 | * remote_name to be freed. | |
250 | */ | |
719fc62f | 251 | Channel * |
0fbe8c74 | 252 | channel_new(char *ctype, int type, int rfd, int wfd, int efd, |
f91d9a89 | 253 | u_int window, u_int maxpack, int extusage, char *remote_name, int nonblock) |
0fbe8c74 | 254 | { |
9a995072 | 255 | int found; |
256 | u_int i; | |
0fbe8c74 | 257 | Channel *c; |
5260325f | 258 | |
259 | /* Do initial allocation if this is the first call. */ | |
260 | if (channels_alloc == 0) { | |
261 | channels_alloc = 10; | |
52e3daed | 262 | channels = xcalloc(channels_alloc, sizeof(Channel *)); |
5260325f | 263 | for (i = 0; i < channels_alloc; i++) |
719fc62f | 264 | channels[i] = NULL; |
5260325f | 265 | } |
266 | /* Try to find a free slot where to put the new channel. */ | |
267 | for (found = -1, i = 0; i < channels_alloc; i++) | |
719fc62f | 268 | if (channels[i] == NULL) { |
5260325f | 269 | /* Found a free slot. */ |
9a995072 | 270 | found = (int)i; |
5260325f | 271 | break; |
272 | } | |
9a995072 | 273 | if (found < 0) { |
aa3378df | 274 | /* There are no free slots. Take last+1 slot and expand the array. */ |
5260325f | 275 | found = channels_alloc; |
5df8c731 | 276 | if (channels_alloc > 10000) |
277 | fatal("channel_new: internal error: channels_alloc %d " | |
278 | "too big.", channels_alloc); | |
c5d10563 | 279 | channels = xrealloc(channels, channels_alloc + 10, |
280 | sizeof(Channel *)); | |
20419cc1 | 281 | channels_alloc += 10; |
de273eef | 282 | debug2("channel: expanding %d", channels_alloc); |
5260325f | 283 | for (i = found; i < channels_alloc; i++) |
719fc62f | 284 | channels[i] = NULL; |
5260325f | 285 | } |
719fc62f | 286 | /* Initialize and return new channel. */ |
52e3daed | 287 | c = channels[found] = xcalloc(1, sizeof(Channel)); |
5260325f | 288 | buffer_init(&c->input); |
289 | buffer_init(&c->output); | |
7368a6c8 | 290 | buffer_init(&c->extended); |
70bef40e | 291 | c->ostate = CHAN_OUTPUT_OPEN; |
292 | c->istate = CHAN_INPUT_OPEN; | |
293 | c->flags = 0; | |
a22aff1f | 294 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock); |
5260325f | 295 | c->self = found; |
296 | c->type = type; | |
7368a6c8 | 297 | c->ctype = ctype; |
0b242b12 | 298 | c->local_window = window; |
299 | c->local_window_max = window; | |
300 | c->local_consumed = 0; | |
301 | c->local_maxpacket = maxpack; | |
5260325f | 302 | c->remote_id = -1; |
0d942eff | 303 | c->remote_name = xstrdup(remote_name); |
7368a6c8 | 304 | c->remote_window = 0; |
305 | c->remote_maxpacket = 0; | |
a5f82435 | 306 | c->force_drain = 0; |
ac151b18 | 307 | c->single_connection = 0; |
3cf2be58 | 308 | c->detach_user = NULL; |
8cd0437d | 309 | c->detach_close = 0; |
05ca0898 | 310 | c->confirm = NULL; |
5e96b616 | 311 | c->confirm_ctx = NULL; |
2e73a022 | 312 | c->input_filter = NULL; |
c1c6a032 | 313 | c->output_filter = NULL; |
5260325f | 314 | debug("channel %d: new [%s]", found, remote_name); |
719fc62f | 315 | return c; |
7368a6c8 | 316 | } |
8efc0c15 | 317 | |
489aa2e9 | 318 | static int |
319 | channel_find_maxfd(void) | |
320 | { | |
9a995072 | 321 | u_int i; |
322 | int max = 0; | |
489aa2e9 | 323 | Channel *c; |
324 | ||
325 | for (i = 0; i < channels_alloc; i++) { | |
326 | c = channels[i]; | |
327 | if (c != NULL) { | |
328 | max = MAX(max, c->rfd); | |
329 | max = MAX(max, c->wfd); | |
330 | max = MAX(max, c->efd); | |
331 | } | |
332 | } | |
333 | return max; | |
334 | } | |
335 | ||
336 | int | |
337 | channel_close_fd(int *fdp) | |
338 | { | |
339 | int ret = 0, fd = *fdp; | |
340 | ||
341 | if (fd != -1) { | |
342 | ret = close(fd); | |
343 | *fdp = -1; | |
344 | if (fd == channel_max_fd) | |
345 | channel_max_fd = channel_find_maxfd(); | |
346 | } | |
347 | return ret; | |
348 | } | |
349 | ||
0fbe8c74 | 350 | /* Close all channel fd/socket. */ |
396c147e | 351 | static void |
0fbe8c74 | 352 | channel_close_fds(Channel *c) |
353 | { | |
5e96b616 | 354 | debug3("channel %d: close_fds r %d w %d e %d c %d", |
355 | c->self, c->rfd, c->wfd, c->efd, c->ctl_fd); | |
6fd8622b | 356 | |
489aa2e9 | 357 | channel_close_fd(&c->sock); |
5e96b616 | 358 | channel_close_fd(&c->ctl_fd); |
489aa2e9 | 359 | channel_close_fd(&c->rfd); |
360 | channel_close_fd(&c->wfd); | |
361 | channel_close_fd(&c->efd); | |
0fbe8c74 | 362 | } |
363 | ||
8e7895b8 | 364 | /* Free the channel and close its fd/socket. */ |
8e7895b8 | 365 | void |
366 | channel_free(Channel *c) | |
367 | { | |
368 | char *s; | |
9a995072 | 369 | u_int i, n; |
8e7895b8 | 370 | |
371 | for (n = 0, i = 0; i < channels_alloc; i++) | |
372 | if (channels[i]) | |
373 | n++; | |
9a995072 | 374 | debug("channel %d: free: %s, nchannels %u", c->self, |
8e7895b8 | 375 | c->remote_name ? c->remote_name : "???", n); |
376 | ||
377 | s = channel_open_message(); | |
d7ac5f18 | 378 | debug3("channel %d: status: %s", c->self, s); |
8e7895b8 | 379 | xfree(s); |
380 | ||
8e7895b8 | 381 | if (c->sock != -1) |
382 | shutdown(c->sock, SHUT_RDWR); | |
5e96b616 | 383 | if (c->ctl_fd != -1) |
384 | shutdown(c->ctl_fd, SHUT_RDWR); | |
8e7895b8 | 385 | channel_close_fds(c); |
386 | buffer_free(&c->input); | |
387 | buffer_free(&c->output); | |
388 | buffer_free(&c->extended); | |
389 | if (c->remote_name) { | |
390 | xfree(c->remote_name); | |
391 | c->remote_name = NULL; | |
392 | } | |
393 | channels[c->self] = NULL; | |
394 | xfree(c); | |
395 | } | |
396 | ||
8e7895b8 | 397 | void |
d6746a0b | 398 | channel_free_all(void) |
8e7895b8 | 399 | { |
9a995072 | 400 | u_int i; |
8e7895b8 | 401 | |
d6746a0b | 402 | for (i = 0; i < channels_alloc; i++) |
403 | if (channels[i] != NULL) | |
404 | channel_free(channels[i]); | |
8e7895b8 | 405 | } |
406 | ||
407 | /* | |
408 | * Closes the sockets/fds of all channels. This is used to close extra file | |
409 | * descriptors after a fork. | |
410 | */ | |
8e7895b8 | 411 | void |
d5bb9418 | 412 | channel_close_all(void) |
8e7895b8 | 413 | { |
9a995072 | 414 | u_int i; |
8e7895b8 | 415 | |
416 | for (i = 0; i < channels_alloc; i++) | |
417 | if (channels[i] != NULL) | |
418 | channel_close_fds(channels[i]); | |
419 | } | |
420 | ||
3cf2be58 | 421 | /* |
422 | * Stop listening to channels. | |
423 | */ | |
3cf2be58 | 424 | void |
425 | channel_stop_listening(void) | |
426 | { | |
9a995072 | 427 | u_int i; |
3cf2be58 | 428 | Channel *c; |
429 | ||
430 | for (i = 0; i < channels_alloc; i++) { | |
431 | c = channels[i]; | |
432 | if (c != NULL) { | |
433 | switch (c->type) { | |
434 | case SSH_CHANNEL_AUTH_SOCKET: | |
435 | case SSH_CHANNEL_PORT_LISTENER: | |
436 | case SSH_CHANNEL_RPORT_LISTENER: | |
437 | case SSH_CHANNEL_X11_LISTENER: | |
489aa2e9 | 438 | channel_close_fd(&c->sock); |
3cf2be58 | 439 | channel_free(c); |
440 | break; | |
441 | } | |
442 | } | |
443 | } | |
444 | } | |
445 | ||
8e7895b8 | 446 | /* |
447 | * Returns true if no channel has too much buffered data, and false if one or | |
448 | * more channel is overfull. | |
449 | */ | |
8e7895b8 | 450 | int |
d5bb9418 | 451 | channel_not_very_much_buffered_data(void) |
8e7895b8 | 452 | { |
453 | u_int i; | |
454 | Channel *c; | |
455 | ||
456 | for (i = 0; i < channels_alloc; i++) { | |
457 | c = channels[i]; | |
458 | if (c != NULL && c->type == SSH_CHANNEL_OPEN) { | |
0c139bd1 | 459 | #if 0 |
460 | if (!compat20 && | |
461 | buffer_len(&c->input) > packet_get_maxsize()) { | |
faa483fa | 462 | debug2("channel %d: big input buffer %d", |
8e7895b8 | 463 | c->self, buffer_len(&c->input)); |
464 | return 0; | |
465 | } | |
0c139bd1 | 466 | #endif |
8e7895b8 | 467 | if (buffer_len(&c->output) > packet_get_maxsize()) { |
a27002e5 | 468 | debug2("channel %d: big output buffer %u > %u", |
0c139bd1 | 469 | c->self, buffer_len(&c->output), |
470 | packet_get_maxsize()); | |
8e7895b8 | 471 | return 0; |
472 | } | |
473 | } | |
474 | } | |
475 | return 1; | |
476 | } | |
477 | ||
478 | /* Returns true if any channel is still open. */ | |
8e7895b8 | 479 | int |
d5bb9418 | 480 | channel_still_open(void) |
8e7895b8 | 481 | { |
9a995072 | 482 | u_int i; |
8e7895b8 | 483 | Channel *c; |
484 | ||
485 | for (i = 0; i < channels_alloc; i++) { | |
486 | c = channels[i]; | |
487 | if (c == NULL) | |
488 | continue; | |
489 | switch (c->type) { | |
490 | case SSH_CHANNEL_X11_LISTENER: | |
491 | case SSH_CHANNEL_PORT_LISTENER: | |
492 | case SSH_CHANNEL_RPORT_LISTENER: | |
493 | case SSH_CHANNEL_CLOSED: | |
494 | case SSH_CHANNEL_AUTH_SOCKET: | |
495 | case SSH_CHANNEL_DYNAMIC: | |
496 | case SSH_CHANNEL_CONNECTING: | |
497 | case SSH_CHANNEL_ZOMBIE: | |
498 | continue; | |
499 | case SSH_CHANNEL_LARVAL: | |
500 | if (!compat20) | |
501 | fatal("cannot happen: SSH_CHANNEL_LARVAL"); | |
502 | continue; | |
503 | case SSH_CHANNEL_OPENING: | |
504 | case SSH_CHANNEL_OPEN: | |
505 | case SSH_CHANNEL_X11_OPEN: | |
506 | return 1; | |
507 | case SSH_CHANNEL_INPUT_DRAINING: | |
508 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
509 | if (!compat13) | |
510 | fatal("cannot happen: OUT_DRAIN"); | |
511 | return 1; | |
512 | default: | |
513 | fatal("channel_still_open: bad channel type %d", c->type); | |
514 | /* NOTREACHED */ | |
515 | } | |
516 | } | |
517 | return 0; | |
518 | } | |
519 | ||
520 | /* Returns the id of an open channel suitable for keepaliving */ | |
8e7895b8 | 521 | int |
d5bb9418 | 522 | channel_find_open(void) |
8e7895b8 | 523 | { |
9a995072 | 524 | u_int i; |
8e7895b8 | 525 | Channel *c; |
526 | ||
527 | for (i = 0; i < channels_alloc; i++) { | |
528 | c = channels[i]; | |
13de3560 | 529 | if (c == NULL || c->remote_id < 0) |
8e7895b8 | 530 | continue; |
531 | switch (c->type) { | |
532 | case SSH_CHANNEL_CLOSED: | |
533 | case SSH_CHANNEL_DYNAMIC: | |
534 | case SSH_CHANNEL_X11_LISTENER: | |
535 | case SSH_CHANNEL_PORT_LISTENER: | |
536 | case SSH_CHANNEL_RPORT_LISTENER: | |
537 | case SSH_CHANNEL_OPENING: | |
538 | case SSH_CHANNEL_CONNECTING: | |
539 | case SSH_CHANNEL_ZOMBIE: | |
540 | continue; | |
541 | case SSH_CHANNEL_LARVAL: | |
542 | case SSH_CHANNEL_AUTH_SOCKET: | |
543 | case SSH_CHANNEL_OPEN: | |
544 | case SSH_CHANNEL_X11_OPEN: | |
545 | return i; | |
546 | case SSH_CHANNEL_INPUT_DRAINING: | |
547 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
548 | if (!compat13) | |
549 | fatal("cannot happen: OUT_DRAIN"); | |
550 | return i; | |
551 | default: | |
552 | fatal("channel_find_open: bad channel type %d", c->type); | |
553 | /* NOTREACHED */ | |
554 | } | |
555 | } | |
556 | return -1; | |
557 | } | |
558 | ||
559 | ||
560 | /* | |
561 | * Returns a message describing the currently open forwarded connections, | |
562 | * suitable for sending to the client. The message contains crlf pairs for | |
563 | * newlines. | |
564 | */ | |
8e7895b8 | 565 | char * |
d5bb9418 | 566 | channel_open_message(void) |
8e7895b8 | 567 | { |
568 | Buffer buffer; | |
569 | Channel *c; | |
570 | char buf[1024], *cp; | |
9a995072 | 571 | u_int i; |
8e7895b8 | 572 | |
573 | buffer_init(&buffer); | |
574 | snprintf(buf, sizeof buf, "The following connections are open:\r\n"); | |
575 | buffer_append(&buffer, buf, strlen(buf)); | |
576 | for (i = 0; i < channels_alloc; i++) { | |
577 | c = channels[i]; | |
578 | if (c == NULL) | |
579 | continue; | |
580 | switch (c->type) { | |
581 | case SSH_CHANNEL_X11_LISTENER: | |
582 | case SSH_CHANNEL_PORT_LISTENER: | |
583 | case SSH_CHANNEL_RPORT_LISTENER: | |
584 | case SSH_CHANNEL_CLOSED: | |
585 | case SSH_CHANNEL_AUTH_SOCKET: | |
586 | case SSH_CHANNEL_ZOMBIE: | |
587 | continue; | |
588 | case SSH_CHANNEL_LARVAL: | |
589 | case SSH_CHANNEL_OPENING: | |
590 | case SSH_CHANNEL_CONNECTING: | |
591 | case SSH_CHANNEL_DYNAMIC: | |
592 | case SSH_CHANNEL_OPEN: | |
593 | case SSH_CHANNEL_X11_OPEN: | |
594 | case SSH_CHANNEL_INPUT_DRAINING: | |
595 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
5e96b616 | 596 | snprintf(buf, sizeof buf, |
597 | " #%d %.300s (t%d r%d i%d/%d o%d/%d fd %d/%d cfd %d)\r\n", | |
8e7895b8 | 598 | c->self, c->remote_name, |
599 | c->type, c->remote_id, | |
600 | c->istate, buffer_len(&c->input), | |
601 | c->ostate, buffer_len(&c->output), | |
5e96b616 | 602 | c->rfd, c->wfd, c->ctl_fd); |
8e7895b8 | 603 | buffer_append(&buffer, buf, strlen(buf)); |
604 | continue; | |
605 | default: | |
606 | fatal("channel_open_message: bad channel type %d", c->type); | |
607 | /* NOTREACHED */ | |
608 | } | |
609 | } | |
610 | buffer_append(&buffer, "\0", 1); | |
611 | cp = xstrdup(buffer_ptr(&buffer)); | |
612 | buffer_free(&buffer); | |
613 | return cp; | |
614 | } | |
615 | ||
616 | void | |
617 | channel_send_open(int id) | |
618 | { | |
619 | Channel *c = channel_lookup(id); | |
e1feb9bf | 620 | |
8e7895b8 | 621 | if (c == NULL) { |
bbe88b6d | 622 | logit("channel_send_open: %d: bad id", id); |
8e7895b8 | 623 | return; |
624 | } | |
6226a8f8 | 625 | debug2("channel %d: send open", id); |
8e7895b8 | 626 | packet_start(SSH2_MSG_CHANNEL_OPEN); |
627 | packet_put_cstring(c->ctype); | |
628 | packet_put_int(c->self); | |
629 | packet_put_int(c->local_window); | |
630 | packet_put_int(c->local_maxpacket); | |
631 | packet_send(); | |
632 | } | |
633 | ||
634 | void | |
6226a8f8 | 635 | channel_request_start(int id, char *service, int wantconfirm) |
8e7895b8 | 636 | { |
6226a8f8 | 637 | Channel *c = channel_lookup(id); |
e1feb9bf | 638 | |
8e7895b8 | 639 | if (c == NULL) { |
bbe88b6d | 640 | logit("channel_request_start: %d: unknown channel id", id); |
8e7895b8 | 641 | return; |
642 | } | |
5e96b616 | 643 | debug2("channel %d: request %s confirm %d", id, service, wantconfirm); |
8e7895b8 | 644 | packet_start(SSH2_MSG_CHANNEL_REQUEST); |
645 | packet_put_int(c->remote_id); | |
646 | packet_put_cstring(service); | |
647 | packet_put_char(wantconfirm); | |
648 | } | |
a7137f6b | 649 | |
8e7895b8 | 650 | void |
5e96b616 | 651 | channel_register_confirm(int id, channel_callback_fn *fn, void *ctx) |
8e7895b8 | 652 | { |
653 | Channel *c = channel_lookup(id); | |
e1feb9bf | 654 | |
8e7895b8 | 655 | if (c == NULL) { |
bbe88b6d | 656 | logit("channel_register_comfirm: %d: bad id", id); |
8e7895b8 | 657 | return; |
658 | } | |
05ca0898 | 659 | c->confirm = fn; |
5e96b616 | 660 | c->confirm_ctx = ctx; |
8e7895b8 | 661 | } |
a7137f6b | 662 | |
8e7895b8 | 663 | void |
8cd0437d | 664 | channel_register_cleanup(int id, channel_callback_fn *fn, int do_close) |
8e7895b8 | 665 | { |
b872f7f0 | 666 | Channel *c = channel_by_id(id); |
e1feb9bf | 667 | |
8e7895b8 | 668 | if (c == NULL) { |
bbe88b6d | 669 | logit("channel_register_cleanup: %d: bad id", id); |
8e7895b8 | 670 | return; |
671 | } | |
3cf2be58 | 672 | c->detach_user = fn; |
8cd0437d | 673 | c->detach_close = do_close; |
8e7895b8 | 674 | } |
a7137f6b | 675 | |
8e7895b8 | 676 | void |
677 | channel_cancel_cleanup(int id) | |
678 | { | |
b872f7f0 | 679 | Channel *c = channel_by_id(id); |
e1feb9bf | 680 | |
8e7895b8 | 681 | if (c == NULL) { |
bbe88b6d | 682 | logit("channel_cancel_cleanup: %d: bad id", id); |
8e7895b8 | 683 | return; |
684 | } | |
3cf2be58 | 685 | c->detach_user = NULL; |
8cd0437d | 686 | c->detach_close = 0; |
8e7895b8 | 687 | } |
a7137f6b | 688 | |
8e7895b8 | 689 | void |
c1c6a032 | 690 | channel_register_filter(int id, channel_infilter_fn *ifn, |
691 | channel_outfilter_fn *ofn) | |
8e7895b8 | 692 | { |
693 | Channel *c = channel_lookup(id); | |
e1feb9bf | 694 | |
8e7895b8 | 695 | if (c == NULL) { |
bbe88b6d | 696 | logit("channel_register_filter: %d: bad id", id); |
8e7895b8 | 697 | return; |
698 | } | |
c1c6a032 | 699 | c->input_filter = ifn; |
700 | c->output_filter = ofn; | |
8e7895b8 | 701 | } |
702 | ||
6ae2364d | 703 | void |
8e7895b8 | 704 | channel_set_fds(int id, int rfd, int wfd, int efd, |
399d1ea6 | 705 | int extusage, int nonblock, u_int window_max) |
8efc0c15 | 706 | { |
8e7895b8 | 707 | Channel *c = channel_lookup(id); |
e1feb9bf | 708 | |
8e7895b8 | 709 | if (c == NULL || c->type != SSH_CHANNEL_LARVAL) |
710 | fatal("channel_activate for non-larval channel %d.", id); | |
711 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock); | |
712 | c->type = SSH_CHANNEL_OPEN; | |
399d1ea6 | 713 | c->local_window = c->local_window_max = window_max; |
8e7895b8 | 714 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
715 | packet_put_int(c->remote_id); | |
716 | packet_put_int(c->local_window); | |
717 | packet_send(); | |
8efc0c15 | 718 | } |
719 | ||
aa3378df | 720 | /* |
7368a6c8 | 721 | * 'channel_pre*' are called just before select() to add any bits relevant to |
722 | * channels in the select bitmasks. | |
aa3378df | 723 | */ |
7368a6c8 | 724 | /* |
725 | * 'channel_post*': perform any appropriate operations for channels which | |
726 | * have events pending. | |
727 | */ | |
c8e9c167 | 728 | typedef void chan_fn(Channel *c, fd_set *readset, fd_set *writeset); |
7368a6c8 | 729 | chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE]; |
730 | chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE]; | |
8efc0c15 | 731 | |
396c147e | 732 | static void |
c8e9c167 | 733 | channel_pre_listener(Channel *c, fd_set *readset, fd_set *writeset) |
8efc0c15 | 734 | { |
7368a6c8 | 735 | FD_SET(c->sock, readset); |
736 | } | |
5260325f | 737 | |
396c147e | 738 | static void |
c8e9c167 | 739 | channel_pre_connecting(Channel *c, fd_set *readset, fd_set *writeset) |
97fb6912 | 740 | { |
741 | debug3("channel %d: waiting for connection", c->self); | |
742 | FD_SET(c->sock, writeset); | |
743 | } | |
744 | ||
396c147e | 745 | static void |
c8e9c167 | 746 | channel_pre_open_13(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 747 | { |
748 | if (buffer_len(&c->input) < packet_get_maxsize()) | |
749 | FD_SET(c->sock, readset); | |
750 | if (buffer_len(&c->output) > 0) | |
751 | FD_SET(c->sock, writeset); | |
752 | } | |
5260325f | 753 | |
396c147e | 754 | static void |
c8e9c167 | 755 | channel_pre_open(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 756 | { |
0c0738d5 | 757 | u_int limit = compat20 ? c->remote_window : packet_get_maxsize(); |
5260325f | 758 | |
7e7327a1 | 759 | if (c->istate == CHAN_INPUT_OPEN && |
0c0738d5 | 760 | limit > 0 && |
69d9d413 | 761 | buffer_len(&c->input) < limit && |
762 | buffer_check_alloc(&c->input, CHAN_RBUF)) | |
7e7327a1 | 763 | FD_SET(c->rfd, readset); |
764 | if (c->ostate == CHAN_OUTPUT_OPEN || | |
765 | c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { | |
766 | if (buffer_len(&c->output) > 0) { | |
767 | FD_SET(c->wfd, writeset); | |
768 | } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { | |
d2296ed7 | 769 | if (CHANNEL_EFD_OUTPUT_ACTIVE(c)) |
4e2e5cfd | 770 | debug2("channel %d: obuf_empty delayed efd %d/(%d)", |
771 | c->self, c->efd, buffer_len(&c->extended)); | |
d2296ed7 | 772 | else |
773 | chan_obuf_empty(c); | |
7e7327a1 | 774 | } |
775 | } | |
776 | /** XXX check close conditions, too */ | |
0c0738d5 | 777 | if (compat20 && c->efd != -1) { |
7e7327a1 | 778 | if (c->extended_usage == CHAN_EXTENDED_WRITE && |
779 | buffer_len(&c->extended) > 0) | |
780 | FD_SET(c->efd, writeset); | |
d2296ed7 | 781 | else if (!(c->flags & CHAN_EOF_SENT) && |
782 | c->extended_usage == CHAN_EXTENDED_READ && | |
7e7327a1 | 783 | buffer_len(&c->extended) < c->remote_window) |
784 | FD_SET(c->efd, readset); | |
785 | } | |
5e96b616 | 786 | /* XXX: What about efd? races? */ |
f2107e97 | 787 | if (compat20 && c->ctl_fd != -1 && |
5e96b616 | 788 | c->istate == CHAN_INPUT_OPEN && c->ostate == CHAN_OUTPUT_OPEN) |
789 | FD_SET(c->ctl_fd, readset); | |
7e7327a1 | 790 | } |
791 | ||
396c147e | 792 | static void |
c8e9c167 | 793 | channel_pre_input_draining(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 794 | { |
795 | if (buffer_len(&c->input) == 0) { | |
796 | packet_start(SSH_MSG_CHANNEL_CLOSE); | |
797 | packet_put_int(c->remote_id); | |
798 | packet_send(); | |
799 | c->type = SSH_CHANNEL_CLOSED; | |
d7ac5f18 | 800 | debug2("channel %d: closing after input drain.", c->self); |
7368a6c8 | 801 | } |
802 | } | |
5260325f | 803 | |
396c147e | 804 | static void |
c8e9c167 | 805 | channel_pre_output_draining(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 806 | { |
807 | if (buffer_len(&c->output) == 0) | |
719fc62f | 808 | chan_mark_dead(c); |
6ae2364d | 809 | else |
7368a6c8 | 810 | FD_SET(c->sock, writeset); |
811 | } | |
5260325f | 812 | |
7368a6c8 | 813 | /* |
814 | * This is a special state for X11 authentication spoofing. An opened X11 | |
815 | * connection (when authentication spoofing is being done) remains in this | |
816 | * state until the first packet has been completely read. The authentication | |
817 | * data in that packet is then substituted by the real data if it matches the | |
818 | * fake data, and the channel is put into normal mode. | |
0b242b12 | 819 | * XXX All this happens at the client side. |
8e7895b8 | 820 | * Returns: 0 = need more data, -1 = wrong cookie, 1 = ok |
7368a6c8 | 821 | */ |
396c147e | 822 | static int |
8e7895b8 | 823 | x11_open_helper(Buffer *b) |
7368a6c8 | 824 | { |
1e3b8b07 | 825 | u_char *ucp; |
826 | u_int proto_len, data_len; | |
5260325f | 827 | |
7368a6c8 | 828 | /* Check if the fixed size part of the packet is in buffer. */ |
8e7895b8 | 829 | if (buffer_len(b) < 12) |
7368a6c8 | 830 | return 0; |
831 | ||
832 | /* Parse the lengths of variable-length fields. */ | |
20905a8e | 833 | ucp = buffer_ptr(b); |
7368a6c8 | 834 | if (ucp[0] == 0x42) { /* Byte order MSB first. */ |
835 | proto_len = 256 * ucp[6] + ucp[7]; | |
836 | data_len = 256 * ucp[8] + ucp[9]; | |
837 | } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */ | |
838 | proto_len = ucp[6] + 256 * ucp[7]; | |
839 | data_len = ucp[8] + 256 * ucp[9]; | |
840 | } else { | |
d7ac5f18 | 841 | debug2("Initial X11 packet contains bad byte order byte: 0x%x", |
184eed6a | 842 | ucp[0]); |
7368a6c8 | 843 | return -1; |
844 | } | |
5260325f | 845 | |
7368a6c8 | 846 | /* Check if the whole packet is in buffer. */ |
8e7895b8 | 847 | if (buffer_len(b) < |
7368a6c8 | 848 | 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3)) |
849 | return 0; | |
5260325f | 850 | |
7368a6c8 | 851 | /* Check if authentication protocol matches. */ |
852 | if (proto_len != strlen(x11_saved_proto) || | |
853 | memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) { | |
d7ac5f18 | 854 | debug2("X11 connection uses different authentication protocol."); |
7368a6c8 | 855 | return -1; |
856 | } | |
857 | /* Check if authentication data matches our fake data. */ | |
858 | if (data_len != x11_fake_data_len || | |
859 | memcmp(ucp + 12 + ((proto_len + 3) & ~3), | |
860 | x11_fake_data, x11_fake_data_len) != 0) { | |
d7ac5f18 | 861 | debug2("X11 auth data does not match fake data."); |
7368a6c8 | 862 | return -1; |
863 | } | |
864 | /* Check fake data length */ | |
865 | if (x11_fake_data_len != x11_saved_data_len) { | |
866 | error("X11 fake_data_len %d != saved_data_len %d", | |
867 | x11_fake_data_len, x11_saved_data_len); | |
868 | return -1; | |
869 | } | |
870 | /* | |
871 | * Received authentication protocol and data match | |
872 | * our fake data. Substitute the fake data with real | |
873 | * data. | |
874 | */ | |
875 | memcpy(ucp + 12 + ((proto_len + 3) & ~3), | |
876 | x11_saved_data, x11_saved_data_len); | |
877 | return 1; | |
878 | } | |
5260325f | 879 | |
396c147e | 880 | static void |
c8e9c167 | 881 | channel_pre_x11_open_13(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 882 | { |
8e7895b8 | 883 | int ret = x11_open_helper(&c->output); |
e1feb9bf | 884 | |
7368a6c8 | 885 | if (ret == 1) { |
886 | /* Start normal processing for the channel. */ | |
887 | c->type = SSH_CHANNEL_OPEN; | |
a8be9f80 | 888 | channel_pre_open_13(c, readset, writeset); |
7368a6c8 | 889 | } else if (ret == -1) { |
890 | /* | |
891 | * We have received an X11 connection that has bad | |
892 | * authentication information. | |
893 | */ | |
bbe88b6d | 894 | logit("X11 connection rejected because of wrong authentication."); |
7368a6c8 | 895 | buffer_clear(&c->input); |
896 | buffer_clear(&c->output); | |
489aa2e9 | 897 | channel_close_fd(&c->sock); |
7368a6c8 | 898 | c->sock = -1; |
899 | c->type = SSH_CHANNEL_CLOSED; | |
900 | packet_start(SSH_MSG_CHANNEL_CLOSE); | |
901 | packet_put_int(c->remote_id); | |
902 | packet_send(); | |
903 | } | |
904 | } | |
5260325f | 905 | |
396c147e | 906 | static void |
c8e9c167 | 907 | channel_pre_x11_open(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 908 | { |
8e7895b8 | 909 | int ret = x11_open_helper(&c->output); |
a5f82435 | 910 | |
911 | /* c->force_drain = 1; */ | |
912 | ||
7368a6c8 | 913 | if (ret == 1) { |
914 | c->type = SSH_CHANNEL_OPEN; | |
0c0738d5 | 915 | channel_pre_open(c, readset, writeset); |
7368a6c8 | 916 | } else if (ret == -1) { |
bbe88b6d | 917 | logit("X11 connection rejected because of wrong authentication."); |
d7ac5f18 | 918 | debug2("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate); |
8341f420 | 919 | chan_read_failed(c); |
920 | buffer_clear(&c->input); | |
921 | chan_ibuf_empty(c); | |
922 | buffer_clear(&c->output); | |
923 | /* for proto v1, the peer will send an IEOF */ | |
924 | if (compat20) | |
925 | chan_write_failed(c); | |
926 | else | |
927 | c->type = SSH_CHANNEL_OPEN; | |
d7ac5f18 | 928 | debug2("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate); |
7368a6c8 | 929 | } |
930 | } | |
5260325f | 931 | |
28b9cb4d | 932 | /* try to decode a socks4 header */ |
396c147e | 933 | static int |
c8e9c167 | 934 | channel_decode_socks4(Channel *c, fd_set *readset, fd_set *writeset) |
0490e609 | 935 | { |
661e45a0 | 936 | char *p, *host; |
2ceb8101 | 937 | u_int len, have, i, found; |
184eed6a | 938 | char username[256]; |
0490e609 | 939 | struct { |
940 | u_int8_t version; | |
941 | u_int8_t command; | |
942 | u_int16_t dest_port; | |
28b9cb4d | 943 | struct in_addr dest_addr; |
0490e609 | 944 | } s4_req, s4_rsp; |
945 | ||
28b9cb4d | 946 | debug2("channel %d: decode socks4", c->self); |
53b8fe68 | 947 | |
948 | have = buffer_len(&c->input); | |
949 | len = sizeof(s4_req); | |
950 | if (have < len) | |
951 | return 0; | |
952 | p = buffer_ptr(&c->input); | |
953 | for (found = 0, i = len; i < have; i++) { | |
954 | if (p[i] == '\0') { | |
955 | found = 1; | |
956 | break; | |
957 | } | |
958 | if (i > 1024) { | |
959 | /* the peer is probably sending garbage */ | |
960 | debug("channel %d: decode socks4: too long", | |
961 | c->self); | |
962 | return -1; | |
963 | } | |
964 | } | |
965 | if (!found) | |
966 | return 0; | |
0490e609 | 967 | buffer_get(&c->input, (char *)&s4_req.version, 1); |
968 | buffer_get(&c->input, (char *)&s4_req.command, 1); | |
969 | buffer_get(&c->input, (char *)&s4_req.dest_port, 2); | |
28b9cb4d | 970 | buffer_get(&c->input, (char *)&s4_req.dest_addr, 4); |
53b8fe68 | 971 | have = buffer_len(&c->input); |
0490e609 | 972 | p = buffer_ptr(&c->input); |
973 | len = strlen(p); | |
6683b40f | 974 | debug2("channel %d: decode socks4: user %s/%d", c->self, p, len); |
0490e609 | 975 | if (len > have) |
28b9cb4d | 976 | fatal("channel %d: decode socks4: len %d > have %d", |
0490e609 | 977 | c->self, len, have); |
978 | strlcpy(username, p, sizeof(username)); | |
979 | buffer_consume(&c->input, len); | |
980 | buffer_consume(&c->input, 1); /* trailing '\0' */ | |
981 | ||
28b9cb4d | 982 | host = inet_ntoa(s4_req.dest_addr); |
0490e609 | 983 | strlcpy(c->path, host, sizeof(c->path)); |
984 | c->host_port = ntohs(s4_req.dest_port); | |
184eed6a | 985 | |
d7ac5f18 | 986 | debug2("channel %d: dynamic request: socks4 host %s port %u command %u", |
6683b40f | 987 | c->self, host, c->host_port, s4_req.command); |
0490e609 | 988 | |
28b9cb4d | 989 | if (s4_req.command != 1) { |
990 | debug("channel %d: cannot handle: socks4 cn %d", | |
991 | c->self, s4_req.command); | |
992 | return -1; | |
0490e609 | 993 | } |
28b9cb4d | 994 | s4_rsp.version = 0; /* vn: 0 for reply */ |
995 | s4_rsp.command = 90; /* cd: req granted */ | |
0490e609 | 996 | s4_rsp.dest_port = 0; /* ignored */ |
28b9cb4d | 997 | s4_rsp.dest_addr.s_addr = INADDR_ANY; /* ignored */ |
15dd2c4f | 998 | buffer_append(&c->output, &s4_rsp, sizeof(s4_rsp)); |
28b9cb4d | 999 | return 1; |
0490e609 | 1000 | } |
1001 | ||
f49658f5 | 1002 | /* try to decode a socks5 header */ |
1003 | #define SSH_SOCKS5_AUTHDONE 0x1000 | |
1004 | #define SSH_SOCKS5_NOAUTH 0x00 | |
1005 | #define SSH_SOCKS5_IPV4 0x01 | |
1006 | #define SSH_SOCKS5_DOMAIN 0x03 | |
1007 | #define SSH_SOCKS5_IPV6 0x04 | |
1008 | #define SSH_SOCKS5_CONNECT 0x01 | |
1009 | #define SSH_SOCKS5_SUCCESS 0x00 | |
1010 | ||
1011 | static int | |
c8e9c167 | 1012 | channel_decode_socks5(Channel *c, fd_set *readset, fd_set *writeset) |
f49658f5 | 1013 | { |
1014 | struct { | |
1015 | u_int8_t version; | |
1016 | u_int8_t command; | |
1017 | u_int8_t reserved; | |
1018 | u_int8_t atyp; | |
1019 | } s5_req, s5_rsp; | |
1020 | u_int16_t dest_port; | |
1021 | u_char *p, dest_addr[255+1]; | |
a217e418 | 1022 | u_int have, need, i, found, nmethods, addrlen, af; |
f49658f5 | 1023 | |
1024 | debug2("channel %d: decode socks5", c->self); | |
1025 | p = buffer_ptr(&c->input); | |
1026 | if (p[0] != 0x05) | |
1027 | return -1; | |
1028 | have = buffer_len(&c->input); | |
1029 | if (!(c->flags & SSH_SOCKS5_AUTHDONE)) { | |
1030 | /* format: ver | nmethods | methods */ | |
aff51935 | 1031 | if (have < 2) |
f49658f5 | 1032 | return 0; |
1033 | nmethods = p[1]; | |
1034 | if (have < nmethods + 2) | |
1035 | return 0; | |
1036 | /* look for method: "NO AUTHENTICATION REQUIRED" */ | |
1037 | for (found = 0, i = 2 ; i < nmethods + 2; i++) { | |
1038 | if (p[i] == SSH_SOCKS5_NOAUTH ) { | |
1039 | found = 1; | |
1040 | break; | |
1041 | } | |
1042 | } | |
1043 | if (!found) { | |
1044 | debug("channel %d: method SSH_SOCKS5_NOAUTH not found", | |
1045 | c->self); | |
1046 | return -1; | |
1047 | } | |
1048 | buffer_consume(&c->input, nmethods + 2); | |
1049 | buffer_put_char(&c->output, 0x05); /* version */ | |
1050 | buffer_put_char(&c->output, SSH_SOCKS5_NOAUTH); /* method */ | |
1051 | FD_SET(c->sock, writeset); | |
1052 | c->flags |= SSH_SOCKS5_AUTHDONE; | |
1053 | debug2("channel %d: socks5 auth done", c->self); | |
1054 | return 0; /* need more */ | |
1055 | } | |
1056 | debug2("channel %d: socks5 post auth", c->self); | |
1057 | if (have < sizeof(s5_req)+1) | |
1058 | return 0; /* need more */ | |
5b5f6af7 | 1059 | memcpy(&s5_req, p, sizeof(s5_req)); |
f49658f5 | 1060 | if (s5_req.version != 0x05 || |
1061 | s5_req.command != SSH_SOCKS5_CONNECT || | |
1062 | s5_req.reserved != 0x00) { | |
d7ac5f18 | 1063 | debug2("channel %d: only socks5 connect supported", c->self); |
f49658f5 | 1064 | return -1; |
1065 | } | |
f8cc7664 | 1066 | switch (s5_req.atyp){ |
f49658f5 | 1067 | case SSH_SOCKS5_IPV4: |
1068 | addrlen = 4; | |
1069 | af = AF_INET; | |
1070 | break; | |
1071 | case SSH_SOCKS5_DOMAIN: | |
1072 | addrlen = p[sizeof(s5_req)]; | |
1073 | af = -1; | |
1074 | break; | |
1075 | case SSH_SOCKS5_IPV6: | |
1076 | addrlen = 16; | |
1077 | af = AF_INET6; | |
1078 | break; | |
1079 | default: | |
d7ac5f18 | 1080 | debug2("channel %d: bad socks5 atyp %d", c->self, s5_req.atyp); |
f49658f5 | 1081 | return -1; |
1082 | } | |
a217e418 | 1083 | need = sizeof(s5_req) + addrlen + 2; |
1084 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) | |
1085 | need++; | |
1086 | if (have < need) | |
f49658f5 | 1087 | return 0; |
1088 | buffer_consume(&c->input, sizeof(s5_req)); | |
1089 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) | |
1090 | buffer_consume(&c->input, 1); /* host string length */ | |
1091 | buffer_get(&c->input, (char *)&dest_addr, addrlen); | |
1092 | buffer_get(&c->input, (char *)&dest_port, 2); | |
1093 | dest_addr[addrlen] = '\0'; | |
1094 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) | |
f6be21a0 | 1095 | strlcpy(c->path, (char *)dest_addr, sizeof(c->path)); |
f49658f5 | 1096 | else if (inet_ntop(af, dest_addr, c->path, sizeof(c->path)) == NULL) |
1097 | return -1; | |
1098 | c->host_port = ntohs(dest_port); | |
b6453d99 | 1099 | |
d7ac5f18 | 1100 | debug2("channel %d: dynamic request: socks5 host %s port %u command %u", |
f49658f5 | 1101 | c->self, c->path, c->host_port, s5_req.command); |
1102 | ||
1103 | s5_rsp.version = 0x05; | |
1104 | s5_rsp.command = SSH_SOCKS5_SUCCESS; | |
1105 | s5_rsp.reserved = 0; /* ignored */ | |
1106 | s5_rsp.atyp = SSH_SOCKS5_IPV4; | |
1107 | ((struct in_addr *)&dest_addr)->s_addr = INADDR_ANY; | |
1108 | dest_port = 0; /* ignored */ | |
1109 | ||
15dd2c4f | 1110 | buffer_append(&c->output, &s5_rsp, sizeof(s5_rsp)); |
1111 | buffer_append(&c->output, &dest_addr, sizeof(struct in_addr)); | |
1112 | buffer_append(&c->output, &dest_port, sizeof(dest_port)); | |
f49658f5 | 1113 | return 1; |
1114 | } | |
1115 | ||
28b9cb4d | 1116 | /* dynamic port forwarding */ |
396c147e | 1117 | static void |
c8e9c167 | 1118 | channel_pre_dynamic(Channel *c, fd_set *readset, fd_set *writeset) |
28b9cb4d | 1119 | { |
1120 | u_char *p; | |
2ceb8101 | 1121 | u_int have; |
1122 | int ret; | |
28b9cb4d | 1123 | |
1124 | have = buffer_len(&c->input); | |
639cb8ab | 1125 | c->delayed = 0; |
28b9cb4d | 1126 | debug2("channel %d: pre_dynamic: have %d", c->self, have); |
070adba2 | 1127 | /* buffer_dump(&c->input); */ |
28b9cb4d | 1128 | /* check if the fixed size part of the packet is in buffer. */ |
f49658f5 | 1129 | if (have < 3) { |
28b9cb4d | 1130 | /* need more */ |
1131 | FD_SET(c->sock, readset); | |
1132 | return; | |
1133 | } | |
1134 | /* try to guess the protocol */ | |
1135 | p = buffer_ptr(&c->input); | |
1136 | switch (p[0]) { | |
6683b40f | 1137 | case 0x04: |
1138 | ret = channel_decode_socks4(c, readset, writeset); | |
1139 | break; | |
f49658f5 | 1140 | case 0x05: |
1141 | ret = channel_decode_socks5(c, readset, writeset); | |
1142 | break; | |
28b9cb4d | 1143 | default: |
1144 | ret = -1; | |
1145 | break; | |
1146 | } | |
1147 | if (ret < 0) { | |
719fc62f | 1148 | chan_mark_dead(c); |
28b9cb4d | 1149 | } else if (ret == 0) { |
1150 | debug2("channel %d: pre_dynamic: need more", c->self); | |
1151 | /* need more */ | |
1152 | FD_SET(c->sock, readset); | |
1153 | } else { | |
1154 | /* switch to the next state */ | |
1155 | c->type = SSH_CHANNEL_OPENING; | |
1156 | port_open_helper(c, "direct-tcpip"); | |
1157 | } | |
1158 | } | |
0490e609 | 1159 | |
7368a6c8 | 1160 | /* This is our fake X11 server socket. */ |
396c147e | 1161 | static void |
c8e9c167 | 1162 | channel_post_x11_listener(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1163 | { |
719fc62f | 1164 | Channel *nc; |
7368a6c8 | 1165 | struct sockaddr addr; |
bcc0381e | 1166 | int newsock; |
7368a6c8 | 1167 | socklen_t addrlen; |
865ac82e | 1168 | char buf[16384], *remote_ipaddr; |
0b242b12 | 1169 | int remote_port; |
7368a6c8 | 1170 | |
1171 | if (FD_ISSET(c->sock, readset)) { | |
1172 | debug("X11 connection requested."); | |
1173 | addrlen = sizeof(addr); | |
1174 | newsock = accept(c->sock, &addr, &addrlen); | |
ac151b18 | 1175 | if (c->single_connection) { |
d7ac5f18 | 1176 | debug2("single_connection: closing X11 listener."); |
ac151b18 | 1177 | channel_close_fd(&c->sock); |
1178 | chan_mark_dead(c); | |
1179 | } | |
7368a6c8 | 1180 | if (newsock < 0) { |
1181 | error("accept: %.100s", strerror(errno)); | |
1182 | return; | |
5260325f | 1183 | } |
bcc0381e | 1184 | set_nodelay(newsock); |
865ac82e | 1185 | remote_ipaddr = get_peer_ipaddr(newsock); |
0b242b12 | 1186 | remote_port = get_peer_port(newsock); |
7368a6c8 | 1187 | snprintf(buf, sizeof buf, "X11 connection from %.200s port %d", |
865ac82e | 1188 | remote_ipaddr, remote_port); |
0b242b12 | 1189 | |
719fc62f | 1190 | nc = channel_new("accepted x11 socket", |
0b242b12 | 1191 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
0d942eff | 1192 | c->local_window_max, c->local_maxpacket, 0, buf, 1); |
0b242b12 | 1193 | if (compat20) { |
1194 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1195 | packet_put_cstring("x11"); | |
719fc62f | 1196 | packet_put_int(nc->self); |
ac151b18 | 1197 | packet_put_int(nc->local_window_max); |
1198 | packet_put_int(nc->local_maxpacket); | |
865ac82e | 1199 | /* originator ipaddr and port */ |
1200 | packet_put_cstring(remote_ipaddr); | |
d0c832f3 | 1201 | if (datafellows & SSH_BUG_X11FWD) { |
d7ac5f18 | 1202 | debug2("ssh2 x11 bug compat mode"); |
d0c832f3 | 1203 | } else { |
1204 | packet_put_int(remote_port); | |
1205 | } | |
0b242b12 | 1206 | packet_send(); |
1207 | } else { | |
1208 | packet_start(SSH_SMSG_X11_OPEN); | |
719fc62f | 1209 | packet_put_int(nc->self); |
8e7895b8 | 1210 | if (packet_get_protocol_flags() & |
1211 | SSH_PROTOFLAG_HOST_IN_FWD_OPEN) | |
449c5ba5 | 1212 | packet_put_cstring(buf); |
0b242b12 | 1213 | packet_send(); |
1214 | } | |
865ac82e | 1215 | xfree(remote_ipaddr); |
8efc0c15 | 1216 | } |
8efc0c15 | 1217 | } |
1218 | ||
396c147e | 1219 | static void |
0490e609 | 1220 | port_open_helper(Channel *c, char *rtype) |
1221 | { | |
1222 | int direct; | |
1223 | char buf[1024]; | |
1224 | char *remote_ipaddr = get_peer_ipaddr(c->sock); | |
29798ed0 | 1225 | int remote_port = get_peer_port(c->sock); |
0490e609 | 1226 | |
1227 | direct = (strcmp(rtype, "direct-tcpip") == 0); | |
1228 | ||
1229 | snprintf(buf, sizeof buf, | |
1230 | "%s: listening port %d for %.100s port %d, " | |
1231 | "connect from %.200s port %d", | |
1232 | rtype, c->listening_port, c->path, c->host_port, | |
1233 | remote_ipaddr, remote_port); | |
1234 | ||
1235 | xfree(c->remote_name); | |
1236 | c->remote_name = xstrdup(buf); | |
1237 | ||
1238 | if (compat20) { | |
1239 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1240 | packet_put_cstring(rtype); | |
1241 | packet_put_int(c->self); | |
1242 | packet_put_int(c->local_window_max); | |
1243 | packet_put_int(c->local_maxpacket); | |
1244 | if (direct) { | |
1245 | /* target host, port */ | |
1246 | packet_put_cstring(c->path); | |
1247 | packet_put_int(c->host_port); | |
1248 | } else { | |
1249 | /* listen address, port */ | |
1250 | packet_put_cstring(c->path); | |
1251 | packet_put_int(c->listening_port); | |
1252 | } | |
1253 | /* originator host and port */ | |
1254 | packet_put_cstring(remote_ipaddr); | |
29798ed0 | 1255 | packet_put_int((u_int)remote_port); |
0490e609 | 1256 | packet_send(); |
1257 | } else { | |
1258 | packet_start(SSH_MSG_PORT_OPEN); | |
1259 | packet_put_int(c->self); | |
1260 | packet_put_cstring(c->path); | |
1261 | packet_put_int(c->host_port); | |
8e7895b8 | 1262 | if (packet_get_protocol_flags() & |
1263 | SSH_PROTOFLAG_HOST_IN_FWD_OPEN) | |
0490e609 | 1264 | packet_put_cstring(c->remote_name); |
1265 | packet_send(); | |
1266 | } | |
1267 | xfree(remote_ipaddr); | |
1268 | } | |
1269 | ||
442aee3a | 1270 | static void |
1271 | channel_set_reuseaddr(int fd) | |
1272 | { | |
1273 | int on = 1; | |
1274 | ||
1275 | /* | |
1276 | * Set socket options. | |
1277 | * Allow local port reuse in TIME_WAIT. | |
1278 | */ | |
1279 | if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1) | |
1280 | error("setsockopt SO_REUSEADDR fd %d: %s", fd, strerror(errno)); | |
1281 | } | |
1282 | ||
aa3378df | 1283 | /* |
7368a6c8 | 1284 | * This socket is listening for connections to a forwarded TCP/IP port. |
aa3378df | 1285 | */ |
396c147e | 1286 | static void |
c8e9c167 | 1287 | channel_post_port_listener(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1288 | { |
0490e609 | 1289 | Channel *nc; |
7368a6c8 | 1290 | struct sockaddr addr; |
719fc62f | 1291 | int newsock, nextstate; |
7368a6c8 | 1292 | socklen_t addrlen; |
0490e609 | 1293 | char *rtype; |
fa08c86b | 1294 | |
7368a6c8 | 1295 | if (FD_ISSET(c->sock, readset)) { |
1296 | debug("Connection to port %d forwarding " | |
1297 | "to %.100s port %d requested.", | |
1298 | c->listening_port, c->path, c->host_port); | |
0490e609 | 1299 | |
639cb8ab | 1300 | if (c->type == SSH_CHANNEL_RPORT_LISTENER) { |
1301 | nextstate = SSH_CHANNEL_OPENING; | |
1302 | rtype = "forwarded-tcpip"; | |
1303 | } else { | |
1304 | if (c->host_port == 0) { | |
1305 | nextstate = SSH_CHANNEL_DYNAMIC; | |
f3964cb9 | 1306 | rtype = "dynamic-tcpip"; |
639cb8ab | 1307 | } else { |
1308 | nextstate = SSH_CHANNEL_OPENING; | |
1309 | rtype = "direct-tcpip"; | |
1310 | } | |
1311 | } | |
0490e609 | 1312 | |
7368a6c8 | 1313 | addrlen = sizeof(addr); |
1314 | newsock = accept(c->sock, &addr, &addrlen); | |
1315 | if (newsock < 0) { | |
1316 | error("accept: %.100s", strerror(errno)); | |
1317 | return; | |
1318 | } | |
811a6342 | 1319 | set_nodelay(newsock); |
0d942eff | 1320 | nc = channel_new(rtype, nextstate, newsock, newsock, -1, |
1321 | c->local_window_max, c->local_maxpacket, 0, rtype, 1); | |
0490e609 | 1322 | nc->listening_port = c->listening_port; |
1323 | nc->host_port = c->host_port; | |
1324 | strlcpy(nc->path, c->path, sizeof(nc->path)); | |
1325 | ||
639cb8ab | 1326 | if (nextstate == SSH_CHANNEL_DYNAMIC) { |
1327 | /* | |
1328 | * do not call the channel_post handler until | |
1329 | * this flag has been reset by a pre-handler. | |
1330 | * otherwise the FD_ISSET calls might overflow | |
1331 | */ | |
1332 | nc->delayed = 1; | |
1333 | } else { | |
0490e609 | 1334 | port_open_helper(nc, rtype); |
639cb8ab | 1335 | } |
7368a6c8 | 1336 | } |
1337 | } | |
8efc0c15 | 1338 | |
7368a6c8 | 1339 | /* |
1340 | * This is the authentication agent socket listening for connections from | |
1341 | * clients. | |
1342 | */ | |
396c147e | 1343 | static void |
c8e9c167 | 1344 | channel_post_auth_listener(Channel *c, fd_set *readset, fd_set *writeset) |
8efc0c15 | 1345 | { |
719fc62f | 1346 | Channel *nc; |
1347 | int newsock; | |
5260325f | 1348 | struct sockaddr addr; |
48e671d5 | 1349 | socklen_t addrlen; |
5260325f | 1350 | |
7368a6c8 | 1351 | if (FD_ISSET(c->sock, readset)) { |
1352 | addrlen = sizeof(addr); | |
1353 | newsock = accept(c->sock, &addr, &addrlen); | |
1354 | if (newsock < 0) { | |
1355 | error("accept from auth socket: %.100s", strerror(errno)); | |
1356 | return; | |
1357 | } | |
719fc62f | 1358 | nc = channel_new("accepted auth socket", |
fa08c86b | 1359 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
1360 | c->local_window_max, c->local_maxpacket, | |
0d942eff | 1361 | 0, "accepted auth socket", 1); |
fa08c86b | 1362 | if (compat20) { |
1363 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1364 | packet_put_cstring("auth-agent@openssh.com"); | |
719fc62f | 1365 | packet_put_int(nc->self); |
fa08c86b | 1366 | packet_put_int(c->local_window_max); |
1367 | packet_put_int(c->local_maxpacket); | |
1368 | } else { | |
1369 | packet_start(SSH_SMSG_AGENT_OPEN); | |
719fc62f | 1370 | packet_put_int(nc->self); |
fa08c86b | 1371 | } |
7368a6c8 | 1372 | packet_send(); |
1373 | } | |
1374 | } | |
5260325f | 1375 | |
396c147e | 1376 | static void |
c8e9c167 | 1377 | channel_post_connecting(Channel *c, fd_set *readset, fd_set *writeset) |
97fb6912 | 1378 | { |
d18e0850 | 1379 | int err = 0; |
8ab2cb35 | 1380 | socklen_t sz = sizeof(err); |
d18e0850 | 1381 | |
97fb6912 | 1382 | if (FD_ISSET(c->sock, writeset)) { |
db518d9b | 1383 | if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, &err, &sz) < 0) { |
d18e0850 | 1384 | err = errno; |
1385 | error("getsockopt SO_ERROR failed"); | |
1386 | } | |
1387 | if (err == 0) { | |
1388 | debug("channel %d: connected", c->self); | |
1389 | c->type = SSH_CHANNEL_OPEN; | |
1390 | if (compat20) { | |
1391 | packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1392 | packet_put_int(c->remote_id); | |
1393 | packet_put_int(c->self); | |
1394 | packet_put_int(c->local_window); | |
1395 | packet_put_int(c->local_maxpacket); | |
1396 | } else { | |
1397 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1398 | packet_put_int(c->remote_id); | |
1399 | packet_put_int(c->self); | |
1400 | } | |
97fb6912 | 1401 | } else { |
d18e0850 | 1402 | debug("channel %d: not connected: %s", |
1403 | c->self, strerror(err)); | |
1404 | if (compat20) { | |
1405 | packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); | |
1406 | packet_put_int(c->remote_id); | |
1407 | packet_put_int(SSH2_OPEN_CONNECT_FAILED); | |
1408 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { | |
1409 | packet_put_cstring(strerror(err)); | |
1410 | packet_put_cstring(""); | |
1411 | } | |
97fb6912 | 1412 | } else { |
d18e0850 | 1413 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
1414 | packet_put_int(c->remote_id); | |
97fb6912 | 1415 | } |
d18e0850 | 1416 | chan_mark_dead(c); |
97fb6912 | 1417 | } |
d18e0850 | 1418 | packet_send(); |
97fb6912 | 1419 | } |
1420 | } | |
1421 | ||
396c147e | 1422 | static int |
c8e9c167 | 1423 | channel_handle_rfd(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1424 | { |
fa1d7d85 | 1425 | char buf[CHAN_RBUF]; |
7368a6c8 | 1426 | int len; |
1427 | ||
6fd8622b | 1428 | if (c->rfd != -1 && |
7368a6c8 | 1429 | FD_ISSET(c->rfd, readset)) { |
ea8c44d9 | 1430 | errno = 0; |
7368a6c8 | 1431 | len = read(c->rfd, buf, sizeof(buf)); |
0fbe8c74 | 1432 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
1433 | return 1; | |
ea8c44d9 | 1434 | #ifndef PTY_ZEROREAD |
7368a6c8 | 1435 | if (len <= 0) { |
ea8c44d9 | 1436 | #else |
9c04d67d | 1437 | if ((!c->isatty && len <= 0) || |
1438 | (c->isatty && (len < 0 || (len == 0 && errno != 0)))) { | |
ea8c44d9 | 1439 | #endif |
d7ac5f18 | 1440 | debug2("channel %d: read<=0 rfd %d len %d", |
7368a6c8 | 1441 | c->self, c->rfd, len); |
28b9cb4d | 1442 | if (c->type != SSH_CHANNEL_OPEN) { |
d7ac5f18 | 1443 | debug2("channel %d: not open", c->self); |
719fc62f | 1444 | chan_mark_dead(c); |
0490e609 | 1445 | return -1; |
28b9cb4d | 1446 | } else if (compat13) { |
9c50edcf | 1447 | buffer_clear(&c->output); |
7368a6c8 | 1448 | c->type = SSH_CHANNEL_INPUT_DRAINING; |
d7ac5f18 | 1449 | debug2("channel %d: input draining.", c->self); |
7368a6c8 | 1450 | } else { |
1451 | chan_read_failed(c); | |
5260325f | 1452 | } |
7368a6c8 | 1453 | return -1; |
1454 | } | |
6aacefa7 | 1455 | if (c->input_filter != NULL) { |
2e73a022 | 1456 | if (c->input_filter(c, buf, len) == -1) { |
d7ac5f18 | 1457 | debug2("channel %d: filter stops", c->self); |
2e73a022 | 1458 | chan_read_failed(c); |
1459 | } | |
d20f3c9e | 1460 | } else if (c->datagram) { |
1461 | buffer_put_string(&c->input, buf, len); | |
2e73a022 | 1462 | } else { |
1463 | buffer_append(&c->input, buf, len); | |
1464 | } | |
7368a6c8 | 1465 | } |
1466 | return 1; | |
1467 | } | |
a7137f6b | 1468 | |
396c147e | 1469 | static int |
c8e9c167 | 1470 | channel_handle_wfd(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1471 | { |
95ce5599 | 1472 | struct termios tio; |
c1c6a032 | 1473 | u_char *data = NULL, *buf; |
780a9951 | 1474 | u_int dlen; |
7368a6c8 | 1475 | int len; |
1476 | ||
1477 | /* Send buffered output data to the socket. */ | |
6fd8622b | 1478 | if (c->wfd != -1 && |
7368a6c8 | 1479 | FD_ISSET(c->wfd, writeset) && |
1480 | buffer_len(&c->output) > 0) { | |
c1c6a032 | 1481 | if (c->output_filter != NULL) { |
1482 | if ((buf = c->output_filter(c, &data, &dlen)) == NULL) { | |
1483 | debug2("channel %d: filter stops", c->self); | |
d7b37427 | 1484 | if (c->type != SSH_CHANNEL_OPEN) |
1485 | chan_mark_dead(c); | |
1486 | else | |
1487 | chan_write_failed(c); | |
1488 | return -1; | |
c1c6a032 | 1489 | } |
1490 | } else if (c->datagram) { | |
1491 | buf = data = buffer_get_string(&c->output, &dlen); | |
1492 | } else { | |
1493 | buf = data = buffer_ptr(&c->output); | |
1494 | dlen = buffer_len(&c->output); | |
1495 | } | |
1496 | ||
d20f3c9e | 1497 | if (c->datagram) { |
d20f3c9e | 1498 | /* ignore truncated writes, datagrams might get lost */ |
1499 | c->local_consumed += dlen + 4; | |
c1c6a032 | 1500 | len = write(c->wfd, buf, dlen); |
d20f3c9e | 1501 | xfree(data); |
1502 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) | |
1503 | return 1; | |
1504 | if (len <= 0) { | |
1505 | if (c->type != SSH_CHANNEL_OPEN) | |
1506 | chan_mark_dead(c); | |
1507 | else | |
1508 | chan_write_failed(c); | |
1509 | return -1; | |
1510 | } | |
1511 | return 1; | |
1512 | } | |
64c0ce80 | 1513 | #ifdef _AIX |
aff51935 | 1514 | /* XXX: Later AIX versions can't push as much data to tty */ |
7fbb4189 | 1515 | if (compat20 && c->wfd_isatty) |
1516 | dlen = MIN(dlen, 8*1024); | |
64c0ce80 | 1517 | #endif |
c1c6a032 | 1518 | |
1519 | len = write(c->wfd, buf, dlen); | |
0fbe8c74 | 1520 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
1521 | return 1; | |
7368a6c8 | 1522 | if (len <= 0) { |
28b9cb4d | 1523 | if (c->type != SSH_CHANNEL_OPEN) { |
d7ac5f18 | 1524 | debug2("channel %d: not open", c->self); |
719fc62f | 1525 | chan_mark_dead(c); |
28b9cb4d | 1526 | return -1; |
1527 | } else if (compat13) { | |
9c50edcf | 1528 | buffer_clear(&c->output); |
d7ac5f18 | 1529 | debug2("channel %d: input draining.", c->self); |
7368a6c8 | 1530 | c->type = SSH_CHANNEL_INPUT_DRAINING; |
1531 | } else { | |
1532 | chan_write_failed(c); | |
5260325f | 1533 | } |
7368a6c8 | 1534 | return -1; |
1535 | } | |
c1c6a032 | 1536 | if (compat20 && c->isatty && dlen >= 1 && buf[0] != '\r') { |
0ae4fe1d | 1537 | if (tcgetattr(c->wfd, &tio) == 0 && |
1538 | !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) { | |
1539 | /* | |
1540 | * Simulate echo to reduce the impact of | |
355724fc | 1541 | * traffic analysis. We need to match the |
95ce5599 | 1542 | * size of a SSH2_MSG_CHANNEL_DATA message |
c1c6a032 | 1543 | * (4 byte channel id + buf) |
0ae4fe1d | 1544 | */ |
95ce5599 | 1545 | packet_send_ignore(4 + len); |
0ae4fe1d | 1546 | packet_send(); |
0ae4fe1d | 1547 | } |
1548 | } | |
7368a6c8 | 1549 | buffer_consume(&c->output, len); |
7e7327a1 | 1550 | if (compat20 && len > 0) { |
1551 | c->local_consumed += len; | |
1552 | } | |
1553 | } | |
1554 | return 1; | |
1555 | } | |
a7137f6b | 1556 | |
396c147e | 1557 | static int |
c8e9c167 | 1558 | channel_handle_efd(Channel *c, fd_set *readset, fd_set *writeset) |
7e7327a1 | 1559 | { |
fa1d7d85 | 1560 | char buf[CHAN_RBUF]; |
7e7327a1 | 1561 | int len; |
1562 | ||
8ce64345 | 1563 | /** XXX handle drain efd, too */ |
7e7327a1 | 1564 | if (c->efd != -1) { |
1565 | if (c->extended_usage == CHAN_EXTENDED_WRITE && | |
1566 | FD_ISSET(c->efd, writeset) && | |
1567 | buffer_len(&c->extended) > 0) { | |
1568 | len = write(c->efd, buffer_ptr(&c->extended), | |
1569 | buffer_len(&c->extended)); | |
de273eef | 1570 | debug2("channel %d: written %d to efd %d", |
7e7327a1 | 1571 | c->self, len, c->efd); |
ee55dacf | 1572 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
1573 | return 1; | |
1574 | if (len <= 0) { | |
1575 | debug2("channel %d: closing write-efd %d", | |
1576 | c->self, c->efd); | |
489aa2e9 | 1577 | channel_close_fd(&c->efd); |
ee55dacf | 1578 | } else { |
7e7327a1 | 1579 | buffer_consume(&c->extended, len); |
1580 | c->local_consumed += len; | |
1581 | } | |
1582 | } else if (c->extended_usage == CHAN_EXTENDED_READ && | |
1583 | FD_ISSET(c->efd, readset)) { | |
1584 | len = read(c->efd, buf, sizeof(buf)); | |
de273eef | 1585 | debug2("channel %d: read %d from efd %d", |
184eed6a | 1586 | c->self, len, c->efd); |
ee55dacf | 1587 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
1588 | return 1; | |
1589 | if (len <= 0) { | |
1590 | debug2("channel %d: closing read-efd %d", | |
8ce64345 | 1591 | c->self, c->efd); |
489aa2e9 | 1592 | channel_close_fd(&c->efd); |
ee55dacf | 1593 | } else { |
7e7327a1 | 1594 | buffer_append(&c->extended, buf, len); |
ee55dacf | 1595 | } |
7e7327a1 | 1596 | } |
1597 | } | |
1598 | return 1; | |
1599 | } | |
a7137f6b | 1600 | |
396c147e | 1601 | static int |
c8e9c167 | 1602 | channel_handle_ctl(Channel *c, fd_set *readset, fd_set *writeset) |
5e96b616 | 1603 | { |
1604 | char buf[16]; | |
1605 | int len; | |
1606 | ||
1607 | /* Monitor control fd to detect if the slave client exits */ | |
1608 | if (c->ctl_fd != -1 && FD_ISSET(c->ctl_fd, readset)) { | |
1609 | len = read(c->ctl_fd, buf, sizeof(buf)); | |
1610 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) | |
1611 | return 1; | |
1612 | if (len <= 0) { | |
1613 | debug2("channel %d: ctl read<=0", c->self); | |
1614 | if (c->type != SSH_CHANNEL_OPEN) { | |
1615 | debug2("channel %d: not open", c->self); | |
1616 | chan_mark_dead(c); | |
1617 | return -1; | |
1618 | } else { | |
1619 | chan_read_failed(c); | |
1620 | chan_write_failed(c); | |
1621 | } | |
1622 | return -1; | |
1623 | } else | |
1624 | fatal("%s: unexpected data on ctl fd", __func__); | |
1625 | } | |
1626 | return 1; | |
1627 | } | |
a7137f6b | 1628 | |
5e96b616 | 1629 | static int |
ee55dacf | 1630 | channel_check_window(Channel *c) |
7e7327a1 | 1631 | { |
28b9cb4d | 1632 | if (c->type == SSH_CHANNEL_OPEN && |
1633 | !(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) && | |
7e7327a1 | 1634 | c->local_window < c->local_window_max/2 && |
1635 | c->local_consumed > 0) { | |
1636 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); | |
1637 | packet_put_int(c->remote_id); | |
1638 | packet_put_int(c->local_consumed); | |
1639 | packet_send(); | |
de273eef | 1640 | debug2("channel %d: window %d sent adjust %d", |
7e7327a1 | 1641 | c->self, c->local_window, |
1642 | c->local_consumed); | |
1643 | c->local_window += c->local_consumed; | |
1644 | c->local_consumed = 0; | |
7368a6c8 | 1645 | } |
1646 | return 1; | |
1647 | } | |
5260325f | 1648 | |
396c147e | 1649 | static void |
c8e9c167 | 1650 | channel_post_open(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1651 | { |
639cb8ab | 1652 | if (c->delayed) |
1653 | return; | |
7368a6c8 | 1654 | channel_handle_rfd(c, readset, writeset); |
1655 | channel_handle_wfd(c, readset, writeset); | |
0c0738d5 | 1656 | if (!compat20) |
639cb8ab | 1657 | return; |
7e7327a1 | 1658 | channel_handle_efd(c, readset, writeset); |
5e96b616 | 1659 | channel_handle_ctl(c, readset, writeset); |
ee55dacf | 1660 | channel_check_window(c); |
7e7327a1 | 1661 | } |
1662 | ||
396c147e | 1663 | static void |
c8e9c167 | 1664 | channel_post_output_drain_13(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1665 | { |
1666 | int len; | |
e1feb9bf | 1667 | |
7368a6c8 | 1668 | /* Send buffered output data to the socket. */ |
1669 | if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) { | |
1670 | len = write(c->sock, buffer_ptr(&c->output), | |
1671 | buffer_len(&c->output)); | |
1672 | if (len <= 0) | |
9c50edcf | 1673 | buffer_clear(&c->output); |
7368a6c8 | 1674 | else |
1675 | buffer_consume(&c->output, len); | |
1676 | } | |
1677 | } | |
5260325f | 1678 | |
396c147e | 1679 | static void |
7e7327a1 | 1680 | channel_handler_init_20(void) |
1681 | { | |
0c0738d5 | 1682 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open; |
0b242b12 | 1683 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
7e7327a1 | 1684 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; |
fa08c86b | 1685 | channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener; |
0b242b12 | 1686 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
fa08c86b | 1687 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; |
97fb6912 | 1688 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1689 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7e7327a1 | 1690 | |
0c0738d5 | 1691 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
7e7327a1 | 1692 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; |
fa08c86b | 1693 | channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener; |
0b242b12 | 1694 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
fa08c86b | 1695 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; |
97fb6912 | 1696 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 1697 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
7e7327a1 | 1698 | } |
1699 | ||
396c147e | 1700 | static void |
7368a6c8 | 1701 | channel_handler_init_13(void) |
1702 | { | |
1703 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13; | |
1704 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_13; | |
1705 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; | |
1706 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; | |
1707 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; | |
1708 | channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining; | |
1709 | channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining; | |
97fb6912 | 1710 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1711 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7368a6c8 | 1712 | |
0c0738d5 | 1713 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
7368a6c8 | 1714 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
1715 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; | |
1716 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; | |
1717 | channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13; | |
97fb6912 | 1718 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 1719 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
7368a6c8 | 1720 | } |
5260325f | 1721 | |
396c147e | 1722 | static void |
7368a6c8 | 1723 | channel_handler_init_15(void) |
1724 | { | |
0c0738d5 | 1725 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open; |
0b242b12 | 1726 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
7368a6c8 | 1727 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
1728 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; | |
1729 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; | |
97fb6912 | 1730 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1731 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7368a6c8 | 1732 | |
1733 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; | |
1734 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; | |
1735 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; | |
0c0738d5 | 1736 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
97fb6912 | 1737 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 1738 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
7368a6c8 | 1739 | } |
1740 | ||
396c147e | 1741 | static void |
7368a6c8 | 1742 | channel_handler_init(void) |
1743 | { | |
1744 | int i; | |
e1feb9bf | 1745 | |
184eed6a | 1746 | for (i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) { |
7368a6c8 | 1747 | channel_pre[i] = NULL; |
1748 | channel_post[i] = NULL; | |
1749 | } | |
7e7327a1 | 1750 | if (compat20) |
1751 | channel_handler_init_20(); | |
1752 | else if (compat13) | |
7368a6c8 | 1753 | channel_handler_init_13(); |
1754 | else | |
1755 | channel_handler_init_15(); | |
1756 | } | |
1757 | ||
418e724c | 1758 | /* gc dead channels */ |
1759 | static void | |
1760 | channel_garbage_collect(Channel *c) | |
1761 | { | |
1762 | if (c == NULL) | |
1763 | return; | |
1764 | if (c->detach_user != NULL) { | |
8cd0437d | 1765 | if (!chan_is_dead(c, c->detach_close)) |
418e724c | 1766 | return; |
d7ac5f18 | 1767 | debug2("channel %d: gc: notify user", c->self); |
418e724c | 1768 | c->detach_user(c->self, NULL); |
1769 | /* if we still have a callback */ | |
1770 | if (c->detach_user != NULL) | |
1771 | return; | |
d7ac5f18 | 1772 | debug2("channel %d: gc: user detached", c->self); |
418e724c | 1773 | } |
1774 | if (!chan_is_dead(c, 1)) | |
1775 | return; | |
d7ac5f18 | 1776 | debug2("channel %d: garbage collecting", c->self); |
418e724c | 1777 | channel_free(c); |
1778 | } | |
1779 | ||
396c147e | 1780 | static void |
c8e9c167 | 1781 | channel_handler(chan_fn *ftab[], fd_set *readset, fd_set *writeset) |
7368a6c8 | 1782 | { |
1783 | static int did_init = 0; | |
9a995072 | 1784 | u_int i; |
7368a6c8 | 1785 | Channel *c; |
1786 | ||
1787 | if (!did_init) { | |
1788 | channel_handler_init(); | |
1789 | did_init = 1; | |
1790 | } | |
1791 | for (i = 0; i < channels_alloc; i++) { | |
719fc62f | 1792 | c = channels[i]; |
1793 | if (c == NULL) | |
5260325f | 1794 | continue; |
6fd8622b | 1795 | if (ftab[c->type] != NULL) |
1796 | (*ftab[c->type])(c, readset, writeset); | |
418e724c | 1797 | channel_garbage_collect(c); |
8efc0c15 | 1798 | } |
8efc0c15 | 1799 | } |
1800 | ||
8e7895b8 | 1801 | /* |
1802 | * Allocate/update select bitmasks and add any bits relevant to channels in | |
1803 | * select bitmasks. | |
1804 | */ | |
6ae2364d | 1805 | void |
c422989b | 1806 | channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp, |
9a995072 | 1807 | u_int *nallocp, int rekeying) |
7368a6c8 | 1808 | { |
c5d10563 | 1809 | u_int n, sz, nfdset; |
39929cdb | 1810 | |
1811 | n = MAX(*maxfdp, channel_max_fd); | |
1812 | ||
c5d10563 | 1813 | nfdset = howmany(n+1, NFDBITS); |
1814 | /* Explicitly test here, because xrealloc isn't always called */ | |
1815 | if (nfdset && SIZE_T_MAX / nfdset < sizeof(fd_mask)) | |
1816 | fatal("channel_prepare_select: max_fd (%d) is too large", n); | |
1817 | sz = nfdset * sizeof(fd_mask); | |
1818 | ||
489aa2e9 | 1819 | /* perhaps check sz < nalloc/2 and shrink? */ |
1820 | if (*readsetp == NULL || sz > *nallocp) { | |
c5d10563 | 1821 | *readsetp = xrealloc(*readsetp, nfdset, sizeof(fd_mask)); |
1822 | *writesetp = xrealloc(*writesetp, nfdset, sizeof(fd_mask)); | |
489aa2e9 | 1823 | *nallocp = sz; |
39929cdb | 1824 | } |
489aa2e9 | 1825 | *maxfdp = n; |
39929cdb | 1826 | memset(*readsetp, 0, sz); |
1827 | memset(*writesetp, 0, sz); | |
1828 | ||
c422989b | 1829 | if (!rekeying) |
1830 | channel_handler(channel_pre, *readsetp, *writesetp); | |
7368a6c8 | 1831 | } |
1832 | ||
8e7895b8 | 1833 | /* |
1834 | * After select, perform any appropriate operations for channels which have | |
1835 | * events pending. | |
1836 | */ | |
6ae2364d | 1837 | void |
c8e9c167 | 1838 | channel_after_select(fd_set *readset, fd_set *writeset) |
7368a6c8 | 1839 | { |
1840 | channel_handler(channel_post, readset, writeset); | |
1841 | } | |
1842 | ||
8e7895b8 | 1843 | |
39929cdb | 1844 | /* If there is data to send to the connection, enqueue some of it now. */ |
6ae2364d | 1845 | void |
d5bb9418 | 1846 | channel_output_poll(void) |
8efc0c15 | 1847 | { |
7368a6c8 | 1848 | Channel *c; |
9a995072 | 1849 | u_int i, len; |
5260325f | 1850 | |
1851 | for (i = 0; i < channels_alloc; i++) { | |
719fc62f | 1852 | c = channels[i]; |
1853 | if (c == NULL) | |
1854 | continue; | |
48e671d5 | 1855 | |
8e7895b8 | 1856 | /* |
1857 | * We are only interested in channels that can have buffered | |
1858 | * incoming data. | |
1859 | */ | |
48e671d5 | 1860 | if (compat13) { |
7368a6c8 | 1861 | if (c->type != SSH_CHANNEL_OPEN && |
1862 | c->type != SSH_CHANNEL_INPUT_DRAINING) | |
48e671d5 | 1863 | continue; |
1864 | } else { | |
7368a6c8 | 1865 | if (c->type != SSH_CHANNEL_OPEN) |
48e671d5 | 1866 | continue; |
48e671d5 | 1867 | } |
e78a59f5 | 1868 | if (compat20 && |
1869 | (c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) { | |
ee55dacf | 1870 | /* XXX is this true? */ |
418e724c | 1871 | debug3("channel %d: will not send data after close", c->self); |
7e7327a1 | 1872 | continue; |
1873 | } | |
5260325f | 1874 | |
1875 | /* Get the amount of buffered data for this channel. */ | |
ee55dacf | 1876 | if ((c->istate == CHAN_INPUT_OPEN || |
1877 | c->istate == CHAN_INPUT_WAIT_DRAIN) && | |
1878 | (len = buffer_len(&c->input)) > 0) { | |
d20f3c9e | 1879 | if (c->datagram) { |
1880 | if (len > 0) { | |
1881 | u_char *data; | |
1882 | u_int dlen; | |
1883 | ||
1884 | data = buffer_get_string(&c->input, | |
1885 | &dlen); | |
1886 | packet_start(SSH2_MSG_CHANNEL_DATA); | |
1887 | packet_put_int(c->remote_id); | |
1888 | packet_put_string(data, dlen); | |
1889 | packet_send(); | |
1890 | c->remote_window -= dlen + 4; | |
1891 | xfree(data); | |
1892 | } | |
1893 | continue; | |
1894 | } | |
8e7895b8 | 1895 | /* |
1896 | * Send some data for the other side over the secure | |
1897 | * connection. | |
1898 | */ | |
7e7327a1 | 1899 | if (compat20) { |
1900 | if (len > c->remote_window) | |
1901 | len = c->remote_window; | |
1902 | if (len > c->remote_maxpacket) | |
1903 | len = c->remote_maxpacket; | |
5260325f | 1904 | } else { |
7e7327a1 | 1905 | if (packet_is_interactive()) { |
1906 | if (len > 1024) | |
1907 | len = 512; | |
1908 | } else { | |
1909 | /* Keep the packets at reasonable size. */ | |
1910 | if (len > packet_get_maxsize()/2) | |
1911 | len = packet_get_maxsize()/2; | |
1912 | } | |
5260325f | 1913 | } |
7368a6c8 | 1914 | if (len > 0) { |
7e7327a1 | 1915 | packet_start(compat20 ? |
1916 | SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA); | |
7368a6c8 | 1917 | packet_put_int(c->remote_id); |
1918 | packet_put_string(buffer_ptr(&c->input), len); | |
1919 | packet_send(); | |
1920 | buffer_consume(&c->input, len); | |
1921 | c->remote_window -= len; | |
7368a6c8 | 1922 | } |
1923 | } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) { | |
5260325f | 1924 | if (compat13) |
1925 | fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3"); | |
aa3378df | 1926 | /* |
1927 | * input-buffer is empty and read-socket shutdown: | |
d2296ed7 | 1928 | * tell peer, that we will not send more data: send IEOF. |
1929 | * hack for extended data: delay EOF if EFD still in use. | |
aa3378df | 1930 | */ |
d2296ed7 | 1931 | if (CHANNEL_EFD_INPUT_ACTIVE(c)) |
4e2e5cfd | 1932 | debug2("channel %d: ibuf_empty delayed efd %d/(%d)", |
1933 | c->self, c->efd, buffer_len(&c->extended)); | |
d2296ed7 | 1934 | else |
1935 | chan_ibuf_empty(c); | |
5260325f | 1936 | } |
7e7327a1 | 1937 | /* Send extended data, i.e. stderr */ |
1938 | if (compat20 && | |
d2296ed7 | 1939 | !(c->flags & CHAN_EOF_SENT) && |
7e7327a1 | 1940 | c->remote_window > 0 && |
1941 | (len = buffer_len(&c->extended)) > 0 && | |
1942 | c->extended_usage == CHAN_EXTENDED_READ) { | |
f91d9a89 | 1943 | debug2("channel %d: rwin %u elen %u euse %d", |
ee55dacf | 1944 | c->self, c->remote_window, buffer_len(&c->extended), |
1945 | c->extended_usage); | |
7e7327a1 | 1946 | if (len > c->remote_window) |
1947 | len = c->remote_window; | |
1948 | if (len > c->remote_maxpacket) | |
1949 | len = c->remote_maxpacket; | |
1950 | packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA); | |
1951 | packet_put_int(c->remote_id); | |
1952 | packet_put_int(SSH2_EXTENDED_DATA_STDERR); | |
1953 | packet_put_string(buffer_ptr(&c->extended), len); | |
1954 | packet_send(); | |
1955 | buffer_consume(&c->extended, len); | |
1956 | c->remote_window -= len; | |
ee55dacf | 1957 | debug2("channel %d: sent ext data %d", c->self, len); |
7e7327a1 | 1958 | } |
8efc0c15 | 1959 | } |
8efc0c15 | 1960 | } |
1961 | ||
8e7895b8 | 1962 | |
1963 | /* -- protocol input */ | |
04aa9e67 | 1964 | |
1965 | /* ARGSUSED */ | |
6ae2364d | 1966 | void |
7819b5c3 | 1967 | channel_input_data(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 1968 | { |
48e671d5 | 1969 | int id; |
5260325f | 1970 | char *data; |
1e3b8b07 | 1971 | u_int data_len; |
7368a6c8 | 1972 | Channel *c; |
5260325f | 1973 | |
1974 | /* Get the channel number and verify it. */ | |
48e671d5 | 1975 | id = packet_get_int(); |
7368a6c8 | 1976 | c = channel_lookup(id); |
1977 | if (c == NULL) | |
48e671d5 | 1978 | packet_disconnect("Received data for nonexistent channel %d.", id); |
5260325f | 1979 | |
1980 | /* Ignore any data for non-open channels (might happen on close) */ | |
7368a6c8 | 1981 | if (c->type != SSH_CHANNEL_OPEN && |
1982 | c->type != SSH_CHANNEL_X11_OPEN) | |
48e671d5 | 1983 | return; |
1984 | ||
5260325f | 1985 | /* Get the data. */ |
1986 | data = packet_get_string(&data_len); | |
7368a6c8 | 1987 | |
7741e239 | 1988 | /* |
1989 | * Ignore data for protocol > 1.3 if output end is no longer open. | |
1990 | * For protocol 2 the sending side is reducing its window as it sends | |
1991 | * data, so we must 'fake' consumption of the data in order to ensure | |
1992 | * that window updates are sent back. Otherwise the connection might | |
1993 | * deadlock. | |
1994 | */ | |
1995 | if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN) { | |
1996 | if (compat20) { | |
1997 | c->local_window -= data_len; | |
1998 | c->local_consumed += data_len; | |
1999 | } | |
2000 | xfree(data); | |
2001 | return; | |
2002 | } | |
2003 | ||
6aacefa7 | 2004 | if (compat20) { |
7e7327a1 | 2005 | if (data_len > c->local_maxpacket) { |
bbe88b6d | 2006 | logit("channel %d: rcvd big packet %d, maxpack %d", |
7e7327a1 | 2007 | c->self, data_len, c->local_maxpacket); |
2008 | } | |
2009 | if (data_len > c->local_window) { | |
bbe88b6d | 2010 | logit("channel %d: rcvd too much data %d, win %d", |
7e7327a1 | 2011 | c->self, data_len, c->local_window); |
2012 | xfree(data); | |
2013 | return; | |
2014 | } | |
2015 | c->local_window -= data_len; | |
7e7327a1 | 2016 | } |
95500969 | 2017 | packet_check_eom(); |
d20f3c9e | 2018 | if (c->datagram) |
2019 | buffer_put_string(&c->output, data, data_len); | |
2020 | else | |
2021 | buffer_append(&c->output, data, data_len); | |
5260325f | 2022 | xfree(data); |
8efc0c15 | 2023 | } |
8e7895b8 | 2024 | |
04aa9e67 | 2025 | /* ARGSUSED */ |
6ae2364d | 2026 | void |
7819b5c3 | 2027 | channel_input_extended_data(int type, u_int32_t seq, void *ctxt) |
7e7327a1 | 2028 | { |
2029 | int id; | |
7e7327a1 | 2030 | char *data; |
a594fa74 | 2031 | u_int data_len, tcode; |
7e7327a1 | 2032 | Channel *c; |
2033 | ||
2034 | /* Get the channel number and verify it. */ | |
2035 | id = packet_get_int(); | |
2036 | c = channel_lookup(id); | |
2037 | ||
2038 | if (c == NULL) | |
2039 | packet_disconnect("Received extended_data for bad channel %d.", id); | |
2040 | if (c->type != SSH_CHANNEL_OPEN) { | |
bbe88b6d | 2041 | logit("channel %d: ext data for non open", id); |
7e7327a1 | 2042 | return; |
2043 | } | |
d2296ed7 | 2044 | if (c->flags & CHAN_EOF_RCVD) { |
2045 | if (datafellows & SSH_BUG_EXTEOF) | |
2046 | debug("channel %d: accepting ext data after eof", id); | |
2047 | else | |
2048 | packet_disconnect("Received extended_data after EOF " | |
2049 | "on channel %d.", id); | |
2050 | } | |
7e7327a1 | 2051 | tcode = packet_get_int(); |
2052 | if (c->efd == -1 || | |
2053 | c->extended_usage != CHAN_EXTENDED_WRITE || | |
2054 | tcode != SSH2_EXTENDED_DATA_STDERR) { | |
bbe88b6d | 2055 | logit("channel %d: bad ext data", c->self); |
7e7327a1 | 2056 | return; |
2057 | } | |
2058 | data = packet_get_string(&data_len); | |
95500969 | 2059 | packet_check_eom(); |
7e7327a1 | 2060 | if (data_len > c->local_window) { |
bbe88b6d | 2061 | logit("channel %d: rcvd too much extended_data %d, win %d", |
7e7327a1 | 2062 | c->self, data_len, c->local_window); |
2063 | xfree(data); | |
2064 | return; | |
2065 | } | |
de273eef | 2066 | debug2("channel %d: rcvd ext data %d", c->self, data_len); |
7e7327a1 | 2067 | c->local_window -= data_len; |
2068 | buffer_append(&c->extended, data, data_len); | |
2069 | xfree(data); | |
2070 | } | |
2071 | ||
04aa9e67 | 2072 | /* ARGSUSED */ |
6ae2364d | 2073 | void |
7819b5c3 | 2074 | channel_input_ieof(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 2075 | { |
2076 | int id; | |
2077 | Channel *c; | |
2078 | ||
7368a6c8 | 2079 | id = packet_get_int(); |
95500969 | 2080 | packet_check_eom(); |
7368a6c8 | 2081 | c = channel_lookup(id); |
2082 | if (c == NULL) | |
2083 | packet_disconnect("Received ieof for nonexistent channel %d.", id); | |
2084 | chan_rcvd_ieof(c); | |
a5f82435 | 2085 | |
2086 | /* XXX force input close */ | |
8341f420 | 2087 | if (c->force_drain && c->istate == CHAN_INPUT_OPEN) { |
a5f82435 | 2088 | debug("channel %d: FORCE input drain", c->self); |
2089 | c->istate = CHAN_INPUT_WAIT_DRAIN; | |
32e7d71f | 2090 | if (buffer_len(&c->input) == 0) |
2091 | chan_ibuf_empty(c); | |
a5f82435 | 2092 | } |
2093 | ||
7368a6c8 | 2094 | } |
8efc0c15 | 2095 | |
04aa9e67 | 2096 | /* ARGSUSED */ |
6ae2364d | 2097 | void |
7819b5c3 | 2098 | channel_input_close(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2099 | { |
7368a6c8 | 2100 | int id; |
2101 | Channel *c; | |
5260325f | 2102 | |
7368a6c8 | 2103 | id = packet_get_int(); |
95500969 | 2104 | packet_check_eom(); |
7368a6c8 | 2105 | c = channel_lookup(id); |
2106 | if (c == NULL) | |
2107 | packet_disconnect("Received close for nonexistent channel %d.", id); | |
aa3378df | 2108 | |
2109 | /* | |
2110 | * Send a confirmation that we have closed the channel and no more | |
2111 | * data is coming for it. | |
2112 | */ | |
5260325f | 2113 | packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION); |
7368a6c8 | 2114 | packet_put_int(c->remote_id); |
5260325f | 2115 | packet_send(); |
2116 | ||
aa3378df | 2117 | /* |
2118 | * If the channel is in closed state, we have sent a close request, | |
2119 | * and the other side will eventually respond with a confirmation. | |
2120 | * Thus, we cannot free the channel here, because then there would be | |
2121 | * no-one to receive the confirmation. The channel gets freed when | |
2122 | * the confirmation arrives. | |
2123 | */ | |
7368a6c8 | 2124 | if (c->type != SSH_CHANNEL_CLOSED) { |
aa3378df | 2125 | /* |
2126 | * Not a closed channel - mark it as draining, which will | |
2127 | * cause it to be freed later. | |
2128 | */ | |
9c50edcf | 2129 | buffer_clear(&c->input); |
7368a6c8 | 2130 | c->type = SSH_CHANNEL_OUTPUT_DRAINING; |
5260325f | 2131 | } |
8efc0c15 | 2132 | } |
2133 | ||
7368a6c8 | 2134 | /* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */ |
04aa9e67 | 2135 | /* ARGSUSED */ |
6ae2364d | 2136 | void |
7819b5c3 | 2137 | channel_input_oclose(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2138 | { |
7368a6c8 | 2139 | int id = packet_get_int(); |
2140 | Channel *c = channel_lookup(id); | |
a8a21a53 | 2141 | |
95500969 | 2142 | packet_check_eom(); |
7368a6c8 | 2143 | if (c == NULL) |
2144 | packet_disconnect("Received oclose for nonexistent channel %d.", id); | |
2145 | chan_rcvd_oclose(c); | |
8efc0c15 | 2146 | } |
2147 | ||
04aa9e67 | 2148 | /* ARGSUSED */ |
6ae2364d | 2149 | void |
7819b5c3 | 2150 | channel_input_close_confirmation(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 2151 | { |
2152 | int id = packet_get_int(); | |
2153 | Channel *c = channel_lookup(id); | |
2154 | ||
95500969 | 2155 | packet_check_eom(); |
7368a6c8 | 2156 | if (c == NULL) |
2157 | packet_disconnect("Received close confirmation for " | |
2158 | "out-of-range channel %d.", id); | |
2159 | if (c->type != SSH_CHANNEL_CLOSED) | |
2160 | packet_disconnect("Received close confirmation for " | |
2161 | "non-closed channel %d (type %d).", id, c->type); | |
719fc62f | 2162 | channel_free(c); |
7368a6c8 | 2163 | } |
8efc0c15 | 2164 | |
04aa9e67 | 2165 | /* ARGSUSED */ |
6ae2364d | 2166 | void |
7819b5c3 | 2167 | channel_input_open_confirmation(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2168 | { |
7368a6c8 | 2169 | int id, remote_id; |
2170 | Channel *c; | |
5260325f | 2171 | |
7368a6c8 | 2172 | id = packet_get_int(); |
2173 | c = channel_lookup(id); | |
5260325f | 2174 | |
7368a6c8 | 2175 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) |
2176 | packet_disconnect("Received open confirmation for " | |
2177 | "non-opening channel %d.", id); | |
2178 | remote_id = packet_get_int(); | |
aa3378df | 2179 | /* Record the remote channel number and mark that the channel is now open. */ |
7368a6c8 | 2180 | c->remote_id = remote_id; |
2181 | c->type = SSH_CHANNEL_OPEN; | |
7e7327a1 | 2182 | |
2183 | if (compat20) { | |
2184 | c->remote_window = packet_get_int(); | |
2185 | c->remote_maxpacket = packet_get_int(); | |
05ca0898 | 2186 | if (c->confirm) { |
de273eef | 2187 | debug2("callback start"); |
5e96b616 | 2188 | c->confirm(c->self, c->confirm_ctx); |
de273eef | 2189 | debug2("callback done"); |
7e7327a1 | 2190 | } |
d7ac5f18 | 2191 | debug2("channel %d: open confirm rwindow %u rmax %u", c->self, |
7e7327a1 | 2192 | c->remote_window, c->remote_maxpacket); |
2193 | } | |
95500969 | 2194 | packet_check_eom(); |
8efc0c15 | 2195 | } |
2196 | ||
396c147e | 2197 | static char * |
d18e0850 | 2198 | reason2txt(int reason) |
2199 | { | |
6aacefa7 | 2200 | switch (reason) { |
d18e0850 | 2201 | case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED: |
2202 | return "administratively prohibited"; | |
2203 | case SSH2_OPEN_CONNECT_FAILED: | |
2204 | return "connect failed"; | |
2205 | case SSH2_OPEN_UNKNOWN_CHANNEL_TYPE: | |
2206 | return "unknown channel type"; | |
2207 | case SSH2_OPEN_RESOURCE_SHORTAGE: | |
2208 | return "resource shortage"; | |
2209 | } | |
7e8c18e9 | 2210 | return "unknown reason"; |
d18e0850 | 2211 | } |
2212 | ||
04aa9e67 | 2213 | /* ARGSUSED */ |
6ae2364d | 2214 | void |
7819b5c3 | 2215 | channel_input_open_failure(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2216 | { |
02a024dd | 2217 | int id, reason; |
2218 | char *msg = NULL, *lang = NULL; | |
7368a6c8 | 2219 | Channel *c; |
5260325f | 2220 | |
7368a6c8 | 2221 | id = packet_get_int(); |
2222 | c = channel_lookup(id); | |
2223 | ||
2224 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) | |
2225 | packet_disconnect("Received open failure for " | |
2226 | "non-opening channel %d.", id); | |
7e7327a1 | 2227 | if (compat20) { |
02a024dd | 2228 | reason = packet_get_int(); |
fbe90f7b | 2229 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { |
02a024dd | 2230 | msg = packet_get_string(NULL); |
2231 | lang = packet_get_string(NULL); | |
2232 | } | |
bbe88b6d | 2233 | logit("channel %d: open failed: %s%s%s", id, |
d18e0850 | 2234 | reason2txt(reason), msg ? ": ": "", msg ? msg : ""); |
02a024dd | 2235 | if (msg != NULL) |
2236 | xfree(msg); | |
2237 | if (lang != NULL) | |
2238 | xfree(lang); | |
7e7327a1 | 2239 | } |
95500969 | 2240 | packet_check_eom(); |
5260325f | 2241 | /* Free the channel. This will also close the socket. */ |
719fc62f | 2242 | channel_free(c); |
8efc0c15 | 2243 | } |
2244 | ||
04aa9e67 | 2245 | /* ARGSUSED */ |
8e7895b8 | 2246 | void |
7819b5c3 | 2247 | channel_input_window_adjust(int type, u_int32_t seq, void *ctxt) |
8e7895b8 | 2248 | { |
2249 | Channel *c; | |
f91d9a89 | 2250 | int id; |
2251 | u_int adjust; | |
3ffc6336 | 2252 | |
8e7895b8 | 2253 | if (!compat20) |
2254 | return; | |
8efc0c15 | 2255 | |
8e7895b8 | 2256 | /* Get the channel number and verify it. */ |
2257 | id = packet_get_int(); | |
2258 | c = channel_lookup(id); | |
2259 | ||
b872f7f0 | 2260 | if (c == NULL) { |
2261 | logit("Received window adjust for non-open channel %d.", id); | |
8e7895b8 | 2262 | return; |
2263 | } | |
2264 | adjust = packet_get_int(); | |
95500969 | 2265 | packet_check_eom(); |
f91d9a89 | 2266 | debug2("channel %d: rcvd adjust %u", id, adjust); |
8e7895b8 | 2267 | c->remote_window += adjust; |
2268 | } | |
2269 | ||
04aa9e67 | 2270 | /* ARGSUSED */ |
8e7895b8 | 2271 | void |
7819b5c3 | 2272 | channel_input_port_open(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2273 | { |
8e7895b8 | 2274 | Channel *c = NULL; |
2275 | u_short host_port; | |
2276 | char *host, *originator_string; | |
2277 | int remote_id, sock = -1; | |
5260325f | 2278 | |
8e7895b8 | 2279 | remote_id = packet_get_int(); |
2280 | host = packet_get_string(NULL); | |
2281 | host_port = packet_get_int(); | |
2282 | ||
2283 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) { | |
2284 | originator_string = packet_get_string(NULL); | |
2285 | } else { | |
2286 | originator_string = xstrdup("unknown (remote did not supply name)"); | |
2287 | } | |
95500969 | 2288 | packet_check_eom(); |
8e7895b8 | 2289 | sock = channel_connect_to(host, host_port); |
2290 | if (sock != -1) { | |
2291 | c = channel_new("connected socket", | |
2292 | SSH_CHANNEL_CONNECTING, sock, sock, -1, 0, 0, 0, | |
2293 | originator_string, 1); | |
3a0d3d54 | 2294 | c->remote_id = remote_id; |
5260325f | 2295 | } |
0d942eff | 2296 | xfree(originator_string); |
8e7895b8 | 2297 | if (c == NULL) { |
2298 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
2299 | packet_put_int(remote_id); | |
2300 | packet_send(); | |
2301 | } | |
2302 | xfree(host); | |
8efc0c15 | 2303 | } |
2304 | ||
8e7895b8 | 2305 | |
2306 | /* -- tcp forwarding */ | |
2307 | ||
5e4a7219 | 2308 | void |
2309 | channel_set_af(int af) | |
2310 | { | |
2311 | IPv4or6 = af; | |
2312 | } | |
2313 | ||
5641aefa | 2314 | static int |
2315 | channel_setup_fwd_listener(int type, const char *listen_addr, u_short listen_port, | |
2316 | const char *host_to_connect, u_short port_to_connect, int gateway_ports) | |
8efc0c15 | 2317 | { |
719fc62f | 2318 | Channel *c; |
442aee3a | 2319 | int sock, r, success = 0, wildcard = 0, is_client; |
48e671d5 | 2320 | struct addrinfo hints, *ai, *aitop; |
3867aa0a | 2321 | const char *host, *addr; |
5641aefa | 2322 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
5260325f | 2323 | |
5641aefa | 2324 | host = (type == SSH_CHANNEL_RPORT_LISTENER) ? |
2325 | listen_addr : host_to_connect; | |
3867aa0a | 2326 | is_client = (type == SSH_CHANNEL_PORT_LISTENER); |
02a024dd | 2327 | |
5641aefa | 2328 | if (host == NULL) { |
2329 | error("No forward host name."); | |
38946c65 | 2330 | return 0; |
fa08c86b | 2331 | } |
719fc62f | 2332 | if (strlen(host) > SSH_CHANNEL_PATH_LEN - 1) { |
02a024dd | 2333 | error("Forward host name too long."); |
38946c65 | 2334 | return 0; |
02a024dd | 2335 | } |
5260325f | 2336 | |
3867aa0a | 2337 | /* |
2338 | * Determine whether or not a port forward listens to loopback, | |
f8cc7664 | 2339 | * specified address or wildcard. On the client, a specified bind |
2340 | * address will always override gateway_ports. On the server, a | |
2341 | * gateway_ports of 1 (``yes'') will override the client's | |
2342 | * specification and force a wildcard bind, whereas a value of 2 | |
2343 | * (``clientspecified'') will bind to whatever address the client | |
3867aa0a | 2344 | * asked for. |
2345 | * | |
2346 | * Special-case listen_addrs are: | |
2347 | * | |
2348 | * "0.0.0.0" -> wildcard v4/v6 if SSH_OLD_FORWARD_ADDR | |
2349 | * "" (empty string), "*" -> wildcard v4/v6 | |
2350 | * "localhost" -> loopback v4/v6 | |
2351 | */ | |
2352 | addr = NULL; | |
2353 | if (listen_addr == NULL) { | |
2354 | /* No address specified: default to gateway_ports setting */ | |
2355 | if (gateway_ports) | |
2356 | wildcard = 1; | |
2357 | } else if (gateway_ports || is_client) { | |
2358 | if (((datafellows & SSH_OLD_FORWARD_ADDR) && | |
2359 | strcmp(listen_addr, "0.0.0.0") == 0) || | |
2360 | *listen_addr == '\0' || strcmp(listen_addr, "*") == 0 || | |
2361 | (!is_client && gateway_ports == 1)) | |
2362 | wildcard = 1; | |
2363 | else if (strcmp(listen_addr, "localhost") != 0) | |
2364 | addr = listen_addr; | |
2365 | } | |
2366 | ||
2367 | debug3("channel_setup_fwd_listener: type %d wildcard %d addr %s", | |
2368 | type, wildcard, (addr == NULL) ? "NULL" : addr); | |
2369 | ||
aa3378df | 2370 | /* |
48e671d5 | 2371 | * getaddrinfo returns a loopback address if the hostname is |
2372 | * set to NULL and hints.ai_flags is not AI_PASSIVE | |
aa3378df | 2373 | */ |
48e671d5 | 2374 | memset(&hints, 0, sizeof(hints)); |
2375 | hints.ai_family = IPv4or6; | |
3867aa0a | 2376 | hints.ai_flags = wildcard ? AI_PASSIVE : 0; |
48e671d5 | 2377 | hints.ai_socktype = SOCK_STREAM; |
fa08c86b | 2378 | snprintf(strport, sizeof strport, "%d", listen_port); |
3867aa0a | 2379 | if ((r = getaddrinfo(addr, strport, &hints, &aitop)) != 0) { |
2380 | if (addr == NULL) { | |
2381 | /* This really shouldn't happen */ | |
2382 | packet_disconnect("getaddrinfo: fatal error: %s", | |
2383 | gai_strerror(r)); | |
2384 | } else { | |
38946c65 | 2385 | error("channel_setup_fwd_listener: " |
3867aa0a | 2386 | "getaddrinfo(%.64s): %s", addr, gai_strerror(r)); |
2387 | } | |
38946c65 | 2388 | return 0; |
3867aa0a | 2389 | } |
48e671d5 | 2390 | |
48e671d5 | 2391 | for (ai = aitop; ai; ai = ai->ai_next) { |
2392 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
2393 | continue; | |
2394 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), | |
2395 | strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { | |
5641aefa | 2396 | error("channel_setup_fwd_listener: getnameinfo failed"); |
48e671d5 | 2397 | continue; |
2398 | } | |
2399 | /* Create a port to listen for the host. */ | |
3e131a6d | 2400 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
48e671d5 | 2401 | if (sock < 0) { |
2402 | /* this is no error since kernel may not support ipv6 */ | |
2403 | verbose("socket: %.100s", strerror(errno)); | |
2404 | continue; | |
2405 | } | |
442aee3a | 2406 | |
2407 | channel_set_reuseaddr(sock); | |
facfd613 | 2408 | |
48e671d5 | 2409 | debug("Local forwarding listening on %s port %s.", ntop, strport); |
2410 | ||
2411 | /* Bind the socket to the address. */ | |
2412 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { | |
2413 | /* address can be in use ipv6 address is already bound */ | |
16218745 | 2414 | if (!ai->ai_next) |
2415 | error("bind: %.100s", strerror(errno)); | |
2416 | else | |
2417 | verbose("bind: %.100s", strerror(errno)); | |
2b87da3b | 2418 | |
48e671d5 | 2419 | close(sock); |
2420 | continue; | |
2421 | } | |
2422 | /* Start listening for connections on the socket. */ | |
fce39749 | 2423 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { |
48e671d5 | 2424 | error("listen: %.100s", strerror(errno)); |
2425 | close(sock); | |
2426 | continue; | |
2427 | } | |
2428 | /* Allocate a channel number for the socket. */ | |
8e7895b8 | 2429 | c = channel_new("port listener", type, sock, sock, -1, |
0b242b12 | 2430 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, |
0d942eff | 2431 | 0, "port listener", 1); |
719fc62f | 2432 | strlcpy(c->path, host, sizeof(c->path)); |
2433 | c->host_port = port_to_connect; | |
2434 | c->listening_port = listen_port; | |
48e671d5 | 2435 | success = 1; |
2436 | } | |
2437 | if (success == 0) | |
5641aefa | 2438 | error("channel_setup_fwd_listener: cannot listen to port: %d", |
02a024dd | 2439 | listen_port); |
48e671d5 | 2440 | freeaddrinfo(aitop); |
02a024dd | 2441 | return success; |
5260325f | 2442 | } |
8efc0c15 | 2443 | |
d740ec16 | 2444 | int |
2445 | channel_cancel_rport_listener(const char *host, u_short port) | |
2446 | { | |
9a995072 | 2447 | u_int i; |
2448 | int found = 0; | |
d740ec16 | 2449 | |
f8cc7664 | 2450 | for (i = 0; i < channels_alloc; i++) { |
d740ec16 | 2451 | Channel *c = channels[i]; |
2452 | ||
2453 | if (c != NULL && c->type == SSH_CHANNEL_RPORT_LISTENER && | |
2454 | strncmp(c->path, host, sizeof(c->path)) == 0 && | |
f2107e97 | 2455 | c->listening_port == port) { |
2912cbd6 | 2456 | debug2("%s: close channel %d", __func__, i); |
d740ec16 | 2457 | channel_free(c); |
2458 | found = 1; | |
2459 | } | |
2460 | } | |
2461 | ||
2462 | return (found); | |
2463 | } | |
2464 | ||
5641aefa | 2465 | /* protocol local port fwd, used by ssh (and sshd in v1) */ |
2466 | int | |
3867aa0a | 2467 | channel_setup_local_fwd_listener(const char *listen_host, u_short listen_port, |
5641aefa | 2468 | const char *host_to_connect, u_short port_to_connect, int gateway_ports) |
2469 | { | |
2470 | return channel_setup_fwd_listener(SSH_CHANNEL_PORT_LISTENER, | |
3867aa0a | 2471 | listen_host, listen_port, host_to_connect, port_to_connect, |
2472 | gateway_ports); | |
5641aefa | 2473 | } |
2474 | ||
2475 | /* protocol v2 remote port fwd, used by sshd */ | |
2476 | int | |
2477 | channel_setup_remote_fwd_listener(const char *listen_address, | |
2478 | u_short listen_port, int gateway_ports) | |
2479 | { | |
2480 | return channel_setup_fwd_listener(SSH_CHANNEL_RPORT_LISTENER, | |
2481 | listen_address, listen_port, NULL, 0, gateway_ports); | |
2482 | } | |
2483 | ||
aa3378df | 2484 | /* |
2485 | * Initiate forwarding of connections to port "port" on remote host through | |
2486 | * the secure channel to host:port from local side. | |
2487 | */ | |
8efc0c15 | 2488 | |
42ea6f5e | 2489 | int |
3867aa0a | 2490 | channel_request_remote_forwarding(const char *listen_host, u_short listen_port, |
fa08c86b | 2491 | const char *host_to_connect, u_short port_to_connect) |
8efc0c15 | 2492 | { |
54a5250f | 2493 | int type, success = 0; |
fa08c86b | 2494 | |
5260325f | 2495 | /* Record locally that connection to this host/port is permitted. */ |
2496 | if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
2497 | fatal("channel_request_remote_forwarding: too many forwards"); | |
2498 | ||
5260325f | 2499 | /* Send the forward request to the remote side. */ |
7e7327a1 | 2500 | if (compat20) { |
3867aa0a | 2501 | const char *address_to_bind; |
2502 | if (listen_host == NULL) | |
2503 | address_to_bind = "localhost"; | |
2504 | else if (*listen_host == '\0' || strcmp(listen_host, "*") == 0) | |
2505 | address_to_bind = ""; | |
2506 | else | |
2507 | address_to_bind = listen_host; | |
2508 | ||
7e7327a1 | 2509 | packet_start(SSH2_MSG_GLOBAL_REQUEST); |
2510 | packet_put_cstring("tcpip-forward"); | |
e0ae8728 | 2511 | packet_put_char(1); /* boolean: want reply */ |
7e7327a1 | 2512 | packet_put_cstring(address_to_bind); |
2513 | packet_put_int(listen_port); | |
fa08c86b | 2514 | packet_send(); |
2515 | packet_write_wait(); | |
2516 | /* Assume that server accepts the request */ | |
2517 | success = 1; | |
7e7327a1 | 2518 | } else { |
2519 | packet_start(SSH_CMSG_PORT_FORWARD_REQUEST); | |
7e7327a1 | 2520 | packet_put_int(listen_port); |
d6f24e45 | 2521 | packet_put_cstring(host_to_connect); |
2522 | packet_put_int(port_to_connect); | |
7e7327a1 | 2523 | packet_send(); |
2524 | packet_write_wait(); | |
fa08c86b | 2525 | |
2526 | /* Wait for response from the remote side. */ | |
54a5250f | 2527 | type = packet_read(); |
fa08c86b | 2528 | switch (type) { |
2529 | case SSH_SMSG_SUCCESS: | |
2530 | success = 1; | |
2531 | break; | |
2532 | case SSH_SMSG_FAILURE: | |
fa08c86b | 2533 | break; |
2534 | default: | |
2535 | /* Unknown packet */ | |
2536 | packet_disconnect("Protocol error for port forward request:" | |
2537 | "received packet type %d.", type); | |
2538 | } | |
2539 | } | |
2540 | if (success) { | |
2541 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host_to_connect); | |
2542 | permitted_opens[num_permitted_opens].port_to_connect = port_to_connect; | |
2543 | permitted_opens[num_permitted_opens].listen_port = listen_port; | |
2544 | num_permitted_opens++; | |
7e7327a1 | 2545 | } |
42ea6f5e | 2546 | return (success ? 0 : -1); |
8efc0c15 | 2547 | } |
2548 | ||
d740ec16 | 2549 | /* |
f2107e97 | 2550 | * Request cancellation of remote forwarding of connection host:port from |
d740ec16 | 2551 | * local side. |
2552 | */ | |
d740ec16 | 2553 | void |
3867aa0a | 2554 | channel_request_rforward_cancel(const char *host, u_short port) |
d740ec16 | 2555 | { |
2556 | int i; | |
d740ec16 | 2557 | |
2558 | if (!compat20) | |
2559 | return; | |
2560 | ||
2561 | for (i = 0; i < num_permitted_opens; i++) { | |
f2107e97 | 2562 | if (permitted_opens[i].host_to_connect != NULL && |
d740ec16 | 2563 | permitted_opens[i].listen_port == port) |
2564 | break; | |
2565 | } | |
2566 | if (i >= num_permitted_opens) { | |
2567 | debug("%s: requested forward not found", __func__); | |
2568 | return; | |
2569 | } | |
2570 | packet_start(SSH2_MSG_GLOBAL_REQUEST); | |
2571 | packet_put_cstring("cancel-tcpip-forward"); | |
2572 | packet_put_char(0); | |
3867aa0a | 2573 | packet_put_cstring(host == NULL ? "" : host); |
d740ec16 | 2574 | packet_put_int(port); |
2575 | packet_send(); | |
2576 | ||
2577 | permitted_opens[i].listen_port = 0; | |
2578 | permitted_opens[i].port_to_connect = 0; | |
8c4bd764 | 2579 | xfree(permitted_opens[i].host_to_connect); |
d740ec16 | 2580 | permitted_opens[i].host_to_connect = NULL; |
2581 | } | |
2582 | ||
aa3378df | 2583 | /* |
2584 | * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates | |
2585 | * listening for the port, and sends back a success reply (or disconnect | |
42ea6f5e | 2586 | * message if there was an error). |
aa3378df | 2587 | */ |
42ea6f5e | 2588 | int |
1d1ffb87 | 2589 | channel_input_port_forward_request(int is_root, int gateway_ports) |
8efc0c15 | 2590 | { |
57112b5a | 2591 | u_short port, host_port; |
42ea6f5e | 2592 | int success = 0; |
5260325f | 2593 | char *hostname; |
2594 | ||
2595 | /* Get arguments from the packet. */ | |
2596 | port = packet_get_int(); | |
2597 | hostname = packet_get_string(NULL); | |
2598 | host_port = packet_get_int(); | |
2599 | ||
3c62e7eb | 2600 | #ifndef HAVE_CYGWIN |
aa3378df | 2601 | /* |
2602 | * Check that an unprivileged user is not trying to forward a | |
2603 | * privileged port. | |
2604 | */ | |
5260325f | 2605 | if (port < IPPORT_RESERVED && !is_root) |
8e7c9afc | 2606 | packet_disconnect( |
2607 | "Requested forwarding of port %d but user is not root.", | |
2608 | port); | |
2609 | if (host_port == 0) | |
2610 | packet_disconnect("Dynamic forwarding denied."); | |
3c62e7eb | 2611 | #endif |
8e7c9afc | 2612 | |
fa08c86b | 2613 | /* Initiate forwarding */ |
42ea6f5e | 2614 | success = channel_setup_local_fwd_listener(NULL, port, hostname, |
3867aa0a | 2615 | host_port, gateway_ports); |
5260325f | 2616 | |
2617 | /* Free the argument string. */ | |
2618 | xfree(hostname); | |
42ea6f5e | 2619 | |
2620 | return (success ? 0 : -1); | |
8efc0c15 | 2621 | } |
2622 | ||
01794848 | 2623 | /* |
2624 | * Permits opening to any host/port if permitted_opens[] is empty. This is | |
2625 | * usually called by the server, because the user could connect to any port | |
2626 | * anyway, and the server has no way to know but to trust the client anyway. | |
2627 | */ | |
2628 | void | |
d5bb9418 | 2629 | channel_permit_all_opens(void) |
01794848 | 2630 | { |
2631 | if (num_permitted_opens == 0) | |
2632 | all_opens_permitted = 1; | |
2633 | } | |
2634 | ||
cd332296 | 2635 | void |
01794848 | 2636 | channel_add_permitted_opens(char *host, int port) |
2637 | { | |
2638 | if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
42ea6f5e | 2639 | fatal("channel_add_permitted_opens: too many forwards"); |
01794848 | 2640 | debug("allow port forwarding to host %s port %d", host, port); |
2641 | ||
2642 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host); | |
2643 | permitted_opens[num_permitted_opens].port_to_connect = port; | |
2644 | num_permitted_opens++; | |
2645 | ||
2646 | all_opens_permitted = 0; | |
2647 | } | |
2648 | ||
cd332296 | 2649 | void |
01794848 | 2650 | channel_clear_permitted_opens(void) |
2651 | { | |
2652 | int i; | |
2653 | ||
2654 | for (i = 0; i < num_permitted_opens; i++) | |
d740ec16 | 2655 | if (permitted_opens[i].host_to_connect != NULL) |
2656 | xfree(permitted_opens[i].host_to_connect); | |
01794848 | 2657 | num_permitted_opens = 0; |
2658 | ||
2659 | } | |
2660 | ||
01794848 | 2661 | /* return socket to remote host, port */ |
396c147e | 2662 | static int |
01794848 | 2663 | connect_to(const char *host, u_short port) |
8efc0c15 | 2664 | { |
48e671d5 | 2665 | struct addrinfo hints, *ai, *aitop; |
2666 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; | |
2667 | int gaierr; | |
7368a6c8 | 2668 | int sock = -1; |
48e671d5 | 2669 | |
2670 | memset(&hints, 0, sizeof(hints)); | |
2671 | hints.ai_family = IPv4or6; | |
2672 | hints.ai_socktype = SOCK_STREAM; | |
01794848 | 2673 | snprintf(strport, sizeof strport, "%d", port); |
48e671d5 | 2674 | if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) { |
01794848 | 2675 | error("connect_to %.100s: unknown host (%s)", host, |
2676 | gai_strerror(gaierr)); | |
7368a6c8 | 2677 | return -1; |
48e671d5 | 2678 | } |
48e671d5 | 2679 | for (ai = aitop; ai; ai = ai->ai_next) { |
2680 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
2681 | continue; | |
2682 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), | |
2683 | strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { | |
01794848 | 2684 | error("connect_to: getnameinfo failed"); |
48e671d5 | 2685 | continue; |
5260325f | 2686 | } |
3e131a6d | 2687 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
48e671d5 | 2688 | if (sock < 0) { |
4940c411 | 2689 | if (ai->ai_next == NULL) |
2690 | error("socket: %.100s", strerror(errno)); | |
2691 | else | |
2692 | verbose("socket: %.100s", strerror(errno)); | |
48e671d5 | 2693 | continue; |
5260325f | 2694 | } |
170694d7 | 2695 | if (set_nonblock(sock) == -1) |
2696 | fatal("%s: set_nonblock(%d)", __func__, sock); | |
97fb6912 | 2697 | if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0 && |
2698 | errno != EINPROGRESS) { | |
01794848 | 2699 | error("connect_to %.100s port %s: %.100s", ntop, strport, |
48e671d5 | 2700 | strerror(errno)); |
2701 | close(sock); | |
2b87da3b | 2702 | continue; /* fail -- try next */ |
48e671d5 | 2703 | } |
2704 | break; /* success */ | |
5260325f | 2705 | |
5260325f | 2706 | } |
48e671d5 | 2707 | freeaddrinfo(aitop); |
48e671d5 | 2708 | if (!ai) { |
01794848 | 2709 | error("connect_to %.100s port %d: failed.", host, port); |
7368a6c8 | 2710 | return -1; |
8efc0c15 | 2711 | } |
7368a6c8 | 2712 | /* success */ |
811a6342 | 2713 | set_nodelay(sock); |
7368a6c8 | 2714 | return sock; |
2715 | } | |
01794848 | 2716 | |
fa08c86b | 2717 | int |
b3f8a79c | 2718 | channel_connect_by_listen_address(u_short listen_port) |
fa08c86b | 2719 | { |
2720 | int i; | |
01794848 | 2721 | |
fa08c86b | 2722 | for (i = 0; i < num_permitted_opens; i++) |
d740ec16 | 2723 | if (permitted_opens[i].host_to_connect != NULL && |
2724 | permitted_opens[i].listen_port == listen_port) | |
01794848 | 2725 | return connect_to( |
fa08c86b | 2726 | permitted_opens[i].host_to_connect, |
2727 | permitted_opens[i].port_to_connect); | |
0b6fbf03 | 2728 | error("WARNING: Server requests forwarding for unknown listen_port %d", |
2729 | listen_port); | |
fa08c86b | 2730 | return -1; |
2731 | } | |
48e671d5 | 2732 | |
01794848 | 2733 | /* Check if connecting to that port is permitted and connect. */ |
2734 | int | |
2735 | channel_connect_to(const char *host, u_short port) | |
2736 | { | |
2737 | int i, permit; | |
2738 | ||
2739 | permit = all_opens_permitted; | |
2740 | if (!permit) { | |
2741 | for (i = 0; i < num_permitted_opens; i++) | |
d740ec16 | 2742 | if (permitted_opens[i].host_to_connect != NULL && |
2743 | permitted_opens[i].port_to_connect == port && | |
01794848 | 2744 | strcmp(permitted_opens[i].host_to_connect, host) == 0) |
2745 | permit = 1; | |
2746 | ||
2747 | } | |
2748 | if (!permit) { | |
bbe88b6d | 2749 | logit("Received request to connect to host %.100s port %d, " |
01794848 | 2750 | "but the request was denied.", host, port); |
2751 | return -1; | |
2752 | } | |
2753 | return connect_to(host, port); | |
2754 | } | |
2755 | ||
5e96b616 | 2756 | void |
2757 | channel_send_window_changes(void) | |
2758 | { | |
9a995072 | 2759 | u_int i; |
5e96b616 | 2760 | struct winsize ws; |
2761 | ||
2762 | for (i = 0; i < channels_alloc; i++) { | |
f8cc7664 | 2763 | if (channels[i] == NULL || !channels[i]->client_tty || |
5e96b616 | 2764 | channels[i]->type != SSH_CHANNEL_OPEN) |
2765 | continue; | |
2766 | if (ioctl(channels[i]->rfd, TIOCGWINSZ, &ws) < 0) | |
2767 | continue; | |
2768 | channel_request_start(i, "window-change", 0); | |
148de80c | 2769 | packet_put_int((u_int)ws.ws_col); |
2770 | packet_put_int((u_int)ws.ws_row); | |
2771 | packet_put_int((u_int)ws.ws_xpixel); | |
2772 | packet_put_int((u_int)ws.ws_ypixel); | |
5e96b616 | 2773 | packet_send(); |
2774 | } | |
2775 | } | |
2776 | ||
8e7895b8 | 2777 | /* -- X11 forwarding */ |
8efc0c15 | 2778 | |
aa3378df | 2779 | /* |
2780 | * Creates an internet domain socket for listening for X11 connections. | |
57f228e8 | 2781 | * Returns 0 and a suitable display number for the DISPLAY variable |
2782 | * stored in display_numberp , or -1 if an error occurs. | |
aa3378df | 2783 | */ |
c9d0ad9b | 2784 | int |
e6e573bd | 2785 | x11_create_display_inet(int x11_display_offset, int x11_use_localhost, |
d08341e6 | 2786 | int single_connection, u_int *display_numberp, int **chanids) |
8efc0c15 | 2787 | { |
ac151b18 | 2788 | Channel *nc = NULL; |
57112b5a | 2789 | int display_number, sock; |
2790 | u_short port; | |
48e671d5 | 2791 | struct addrinfo hints, *ai, *aitop; |
2792 | char strport[NI_MAXSERV]; | |
2793 | int gaierr, n, num_socks = 0, socks[NUM_SOCKS]; | |
5260325f | 2794 | |
59e5aff5 | 2795 | if (chanids == NULL) |
2796 | return -1; | |
2797 | ||
95f1eccc | 2798 | for (display_number = x11_display_offset; |
184eed6a | 2799 | display_number < MAX_DISPLAYS; |
2800 | display_number++) { | |
5260325f | 2801 | port = 6000 + display_number; |
48e671d5 | 2802 | memset(&hints, 0, sizeof(hints)); |
2803 | hints.ai_family = IPv4or6; | |
e6e573bd | 2804 | hints.ai_flags = x11_use_localhost ? 0: AI_PASSIVE; |
48e671d5 | 2805 | hints.ai_socktype = SOCK_STREAM; |
2806 | snprintf(strport, sizeof strport, "%d", port); | |
2807 | if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) { | |
2808 | error("getaddrinfo: %.100s", gai_strerror(gaierr)); | |
c9d0ad9b | 2809 | return -1; |
5260325f | 2810 | } |
48e671d5 | 2811 | for (ai = aitop; ai; ai = ai->ai_next) { |
2812 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
2813 | continue; | |
3e131a6d | 2814 | sock = socket(ai->ai_family, ai->ai_socktype, |
2815 | ai->ai_protocol); | |
48e671d5 | 2816 | if (sock < 0) { |
4ee81249 | 2817 | if ((errno != EINVAL) && (errno != EAFNOSUPPORT)) { |
80a44451 | 2818 | error("socket: %.100s", strerror(errno)); |
0ea89f7e | 2819 | freeaddrinfo(aitop); |
c9d0ad9b | 2820 | return -1; |
80a44451 | 2821 | } else { |
22d89d24 | 2822 | debug("x11_create_display_inet: Socket family %d not supported", |
2823 | ai->ai_family); | |
80a44451 | 2824 | continue; |
2825 | } | |
48e671d5 | 2826 | } |
688aaeda | 2827 | #ifdef IPV6_V6ONLY |
2828 | if (ai->ai_family == AF_INET6) { | |
2829 | int on = 1; | |
2830 | if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) < 0) | |
2831 | error("setsockopt IPV6_V6ONLY: %.100s", strerror(errno)); | |
2832 | } | |
2833 | #endif | |
442aee3a | 2834 | channel_set_reuseaddr(sock); |
48e671d5 | 2835 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { |
d7ac5f18 | 2836 | debug2("bind port %d: %.100s", port, strerror(errno)); |
48e671d5 | 2837 | close(sock); |
16218745 | 2838 | |
2839 | if (ai->ai_next) | |
2840 | continue; | |
2841 | ||
48e671d5 | 2842 | for (n = 0; n < num_socks; n++) { |
48e671d5 | 2843 | close(socks[n]); |
2844 | } | |
2845 | num_socks = 0; | |
2846 | break; | |
2847 | } | |
2848 | socks[num_socks++] = sock; | |
80faa19f | 2849 | #ifndef DONT_TRY_OTHER_AF |
48e671d5 | 2850 | if (num_socks == NUM_SOCKS) |
2851 | break; | |
80faa19f | 2852 | #else |
688aaeda | 2853 | if (x11_use_localhost) { |
2854 | if (num_socks == NUM_SOCKS) | |
2855 | break; | |
2856 | } else { | |
2857 | break; | |
2858 | } | |
80faa19f | 2859 | #endif |
5260325f | 2860 | } |
4ccb01d6 | 2861 | freeaddrinfo(aitop); |
48e671d5 | 2862 | if (num_socks > 0) |
2863 | break; | |
5260325f | 2864 | } |
2865 | if (display_number >= MAX_DISPLAYS) { | |
2866 | error("Failed to allocate internet-domain X11 display socket."); | |
c9d0ad9b | 2867 | return -1; |
8efc0c15 | 2868 | } |
5260325f | 2869 | /* Start listening for connections on the socket. */ |
48e671d5 | 2870 | for (n = 0; n < num_socks; n++) { |
2871 | sock = socks[n]; | |
fce39749 | 2872 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { |
48e671d5 | 2873 | error("listen: %.100s", strerror(errno)); |
48e671d5 | 2874 | close(sock); |
c9d0ad9b | 2875 | return -1; |
a7effaac | 2876 | } |
a7effaac | 2877 | } |
5260325f | 2878 | |
48e671d5 | 2879 | /* Allocate a channel for each socket. */ |
52e3daed | 2880 | *chanids = xcalloc(num_socks + 1, sizeof(**chanids)); |
48e671d5 | 2881 | for (n = 0; n < num_socks; n++) { |
2882 | sock = socks[n]; | |
ac151b18 | 2883 | nc = channel_new("x11 listener", |
0b242b12 | 2884 | SSH_CHANNEL_X11_LISTENER, sock, sock, -1, |
2885 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, | |
0d942eff | 2886 | 0, "X11 inet listener", 1); |
3a0d3d54 | 2887 | nc->single_connection = single_connection; |
59e5aff5 | 2888 | (*chanids)[n] = nc->self; |
48e671d5 | 2889 | } |
59e5aff5 | 2890 | (*chanids)[n] = -1; |
5260325f | 2891 | |
c9d0ad9b | 2892 | /* Return the display number for the DISPLAY environment variable. */ |
57f228e8 | 2893 | *display_numberp = display_number; |
2894 | return (0); | |
8efc0c15 | 2895 | } |
2896 | ||
396c147e | 2897 | static int |
1e3b8b07 | 2898 | connect_local_xsocket(u_int dnr) |
8efc0c15 | 2899 | { |
5260325f | 2900 | int sock; |
2901 | struct sockaddr_un addr; | |
5260325f | 2902 | |
805e659f | 2903 | sock = socket(AF_UNIX, SOCK_STREAM, 0); |
2904 | if (sock < 0) | |
2905 | error("socket: %.100s", strerror(errno)); | |
2906 | memset(&addr, 0, sizeof(addr)); | |
2907 | addr.sun_family = AF_UNIX; | |
2908 | snprintf(addr.sun_path, sizeof addr.sun_path, _PATH_UNIX_X, dnr); | |
32596c7b | 2909 | if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) == 0) |
805e659f | 2910 | return sock; |
2911 | close(sock); | |
5260325f | 2912 | error("connect %.100s: %.100s", addr.sun_path, strerror(errno)); |
2913 | return -1; | |
8efc0c15 | 2914 | } |
2915 | ||
0b242b12 | 2916 | int |
2917 | x11_connect_display(void) | |
8efc0c15 | 2918 | { |
4f16046f | 2919 | u_int display_number; |
5260325f | 2920 | const char *display; |
0b242b12 | 2921 | char buf[1024], *cp; |
48e671d5 | 2922 | struct addrinfo hints, *ai, *aitop; |
2923 | char strport[NI_MAXSERV]; | |
4f16046f | 2924 | int gaierr, sock = 0; |
5260325f | 2925 | |
5260325f | 2926 | /* Try to open a socket for the local X server. */ |
2927 | display = getenv("DISPLAY"); | |
2928 | if (!display) { | |
2929 | error("DISPLAY not set."); | |
0b242b12 | 2930 | return -1; |
5260325f | 2931 | } |
aa3378df | 2932 | /* |
2933 | * Now we decode the value of the DISPLAY variable and make a | |
2934 | * connection to the real X server. | |
2935 | */ | |
2936 | ||
2937 | /* | |
2938 | * Check if it is a unix domain socket. Unix domain displays are in | |
2939 | * one of the following formats: unix:d[.s], :d[.s], ::d[.s] | |
2940 | */ | |
5260325f | 2941 | if (strncmp(display, "unix:", 5) == 0 || |
2942 | display[0] == ':') { | |
2943 | /* Connect to the unix domain socket. */ | |
4f16046f | 2944 | if (sscanf(strrchr(display, ':') + 1, "%u", &display_number) != 1) { |
5260325f | 2945 | error("Could not parse display number from DISPLAY: %.100s", |
184eed6a | 2946 | display); |
0b242b12 | 2947 | return -1; |
5260325f | 2948 | } |
2949 | /* Create a socket. */ | |
2950 | sock = connect_local_xsocket(display_number); | |
2951 | if (sock < 0) | |
0b242b12 | 2952 | return -1; |
5260325f | 2953 | |
2954 | /* OK, we now have a connection to the display. */ | |
0b242b12 | 2955 | return sock; |
5260325f | 2956 | } |
aa3378df | 2957 | /* |
2958 | * Connect to an inet socket. The DISPLAY value is supposedly | |
2959 | * hostname:d[.s], where hostname may also be numeric IP address. | |
2960 | */ | |
74860245 | 2961 | strlcpy(buf, display, sizeof(buf)); |
5260325f | 2962 | cp = strchr(buf, ':'); |
2963 | if (!cp) { | |
2964 | error("Could not find ':' in DISPLAY: %.100s", display); | |
0b242b12 | 2965 | return -1; |
5260325f | 2966 | } |
2967 | *cp = 0; | |
aa3378df | 2968 | /* buf now contains the host name. But first we parse the display number. */ |
4f16046f | 2969 | if (sscanf(cp + 1, "%u", &display_number) != 1) { |
5260325f | 2970 | error("Could not parse display number from DISPLAY: %.100s", |
184eed6a | 2971 | display); |
0b242b12 | 2972 | return -1; |
5260325f | 2973 | } |
5260325f | 2974 | |
48e671d5 | 2975 | /* Look up the host address */ |
2976 | memset(&hints, 0, sizeof(hints)); | |
2977 | hints.ai_family = IPv4or6; | |
2978 | hints.ai_socktype = SOCK_STREAM; | |
4f16046f | 2979 | snprintf(strport, sizeof strport, "%u", 6000 + display_number); |
48e671d5 | 2980 | if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) { |
2981 | error("%.100s: unknown host. (%s)", buf, gai_strerror(gaierr)); | |
0b242b12 | 2982 | return -1; |
8efc0c15 | 2983 | } |
48e671d5 | 2984 | for (ai = aitop; ai; ai = ai->ai_next) { |
2985 | /* Create a socket. */ | |
3e131a6d | 2986 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
48e671d5 | 2987 | if (sock < 0) { |
d7ac5f18 | 2988 | debug2("socket: %.100s", strerror(errno)); |
7368a6c8 | 2989 | continue; |
2990 | } | |
2991 | /* Connect it to the display. */ | |
2992 | if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) { | |
4f16046f | 2993 | debug2("connect %.100s port %u: %.100s", buf, |
7368a6c8 | 2994 | 6000 + display_number, strerror(errno)); |
2995 | close(sock); | |
2996 | continue; | |
2997 | } | |
2998 | /* Success */ | |
2999 | break; | |
48e671d5 | 3000 | } |
48e671d5 | 3001 | freeaddrinfo(aitop); |
3002 | if (!ai) { | |
4f16046f | 3003 | error("connect %.100s port %u: %.100s", buf, 6000 + display_number, |
48e671d5 | 3004 | strerror(errno)); |
0b242b12 | 3005 | return -1; |
8efc0c15 | 3006 | } |
bcc0381e | 3007 | set_nodelay(sock); |
0b242b12 | 3008 | return sock; |
3009 | } | |
5260325f | 3010 | |
0b242b12 | 3011 | /* |
3012 | * This is called when SSH_SMSG_X11_OPEN is received. The packet contains | |
3013 | * the remote channel number. We should do whatever we want, and respond | |
3014 | * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE. | |
3015 | */ | |
5260325f | 3016 | |
0b242b12 | 3017 | void |
7819b5c3 | 3018 | x11_input_open(int type, u_int32_t seq, void *ctxt) |
0b242b12 | 3019 | { |
719fc62f | 3020 | Channel *c = NULL; |
3021 | int remote_id, sock = 0; | |
0b242b12 | 3022 | char *remote_host; |
5260325f | 3023 | |
719fc62f | 3024 | debug("Received X11 open request."); |
5260325f | 3025 | |
719fc62f | 3026 | remote_id = packet_get_int(); |
8e7895b8 | 3027 | |
3028 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) { | |
719fc62f | 3029 | remote_host = packet_get_string(NULL); |
0b242b12 | 3030 | } else { |
3031 | remote_host = xstrdup("unknown (remote did not supply name)"); | |
0b242b12 | 3032 | } |
95500969 | 3033 | packet_check_eom(); |
0b242b12 | 3034 | |
3035 | /* Obtain a connection to the real X display. */ | |
3036 | sock = x11_connect_display(); | |
719fc62f | 3037 | if (sock != -1) { |
3038 | /* Allocate a channel for this connection. */ | |
3039 | c = channel_new("connected x11 socket", | |
3040 | SSH_CHANNEL_X11_OPEN, sock, sock, -1, 0, 0, 0, | |
3041 | remote_host, 1); | |
3a0d3d54 | 3042 | c->remote_id = remote_id; |
3043 | c->force_drain = 1; | |
719fc62f | 3044 | } |
0d942eff | 3045 | xfree(remote_host); |
719fc62f | 3046 | if (c == NULL) { |
0b242b12 | 3047 | /* Send refusal to the remote host. */ |
3048 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
719fc62f | 3049 | packet_put_int(remote_id); |
0b242b12 | 3050 | } else { |
0b242b12 | 3051 | /* Send a confirmation to the remote host. */ |
3052 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
719fc62f | 3053 | packet_put_int(remote_id); |
3054 | packet_put_int(c->self); | |
0b242b12 | 3055 | } |
719fc62f | 3056 | packet_send(); |
8efc0c15 | 3057 | } |
3058 | ||
a22aff1f | 3059 | /* dummy protocol handler that denies SSH-1 requests (agent/x11) */ |
3060 | void | |
7819b5c3 | 3061 | deny_input_open(int type, u_int32_t seq, void *ctxt) |
a22aff1f | 3062 | { |
3063 | int rchan = packet_get_int(); | |
e1feb9bf | 3064 | |
6aacefa7 | 3065 | switch (type) { |
a22aff1f | 3066 | case SSH_SMSG_AGENT_OPEN: |
3067 | error("Warning: ssh server tried agent forwarding."); | |
3068 | break; | |
3069 | case SSH_SMSG_X11_OPEN: | |
3070 | error("Warning: ssh server tried X11 forwarding."); | |
3071 | break; | |
3072 | default: | |
7819b5c3 | 3073 | error("deny_input_open: type %d", type); |
a22aff1f | 3074 | break; |
3075 | } | |
1908529f | 3076 | error("Warning: this is probably a break-in attempt by a malicious server."); |
a22aff1f | 3077 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
3078 | packet_put_int(rchan); | |
3079 | packet_send(); | |
3080 | } | |
3081 | ||
aa3378df | 3082 | /* |
3083 | * Requests forwarding of X11 connections, generates fake authentication | |
3084 | * data, and enables authentication spoofing. | |
8e7895b8 | 3085 | * This should be called in the client only. |
aa3378df | 3086 | */ |
6ae2364d | 3087 | void |
9bf083eb | 3088 | x11_request_forwarding_with_spoofing(int client_session_id, const char *disp, |
0b242b12 | 3089 | const char *proto, const char *data) |
8efc0c15 | 3090 | { |
1e3b8b07 | 3091 | u_int data_len = (u_int) strlen(data) / 2; |
ef07103c | 3092 | u_int i, value; |
5260325f | 3093 | char *new_data; |
3094 | int screen_number; | |
3095 | const char *cp; | |
ca75d7de | 3096 | u_int32_t rnd = 0; |
5260325f | 3097 | |
4297b666 | 3098 | if (x11_saved_display == NULL) |
3099 | x11_saved_display = xstrdup(disp); | |
3100 | else if (strcmp(disp, x11_saved_display) != 0) { | |
ef07103c | 3101 | error("x11_request_forwarding_with_spoofing: different " |
3102 | "$DISPLAY already forwarded"); | |
3103 | return; | |
3104 | } | |
3105 | ||
9bf083eb | 3106 | cp = disp; |
3107 | if (disp) | |
3108 | cp = strchr(disp, ':'); | |
5260325f | 3109 | if (cp) |
3110 | cp = strchr(cp, '.'); | |
3111 | if (cp) | |
d6d4897e | 3112 | screen_number = (u_int)strtonum(cp + 1, 0, 400, NULL); |
5260325f | 3113 | else |
3114 | screen_number = 0; | |
3115 | ||
ef07103c | 3116 | if (x11_saved_proto == NULL) { |
3117 | /* Save protocol name. */ | |
3118 | x11_saved_proto = xstrdup(proto); | |
3119 | /* | |
56964485 | 3120 | * Extract real authentication data and generate fake data |
ef07103c | 3121 | * of the same length. |
3122 | */ | |
3123 | x11_saved_data = xmalloc(data_len); | |
3124 | x11_fake_data = xmalloc(data_len); | |
3125 | for (i = 0; i < data_len; i++) { | |
3126 | if (sscanf(data + 2 * i, "%2x", &value) != 1) | |
3127 | fatal("x11_request_forwarding: bad " | |
3128 | "authentication data: %.100s", data); | |
3129 | if (i % 4 == 0) | |
3130 | rnd = arc4random(); | |
3131 | x11_saved_data[i] = value; | |
3132 | x11_fake_data[i] = rnd & 0xff; | |
3133 | rnd >>= 8; | |
3134 | } | |
3135 | x11_saved_data_len = data_len; | |
3136 | x11_fake_data_len = data_len; | |
3137 | } | |
5260325f | 3138 | |
3139 | /* Convert the fake data into hex. */ | |
ef07103c | 3140 | new_data = tohex(x11_fake_data, data_len); |
5260325f | 3141 | |
3142 | /* Send the request packet. */ | |
0b242b12 | 3143 | if (compat20) { |
3144 | channel_request_start(client_session_id, "x11-req", 0); | |
3145 | packet_put_char(0); /* XXX bool single connection */ | |
3146 | } else { | |
3147 | packet_start(SSH_CMSG_X11_REQUEST_FORWARDING); | |
3148 | } | |
3149 | packet_put_cstring(proto); | |
3150 | packet_put_cstring(new_data); | |
5260325f | 3151 | packet_put_int(screen_number); |
3152 | packet_send(); | |
3153 | packet_write_wait(); | |
3154 | xfree(new_data); | |
8efc0c15 | 3155 | } |
3156 | ||
8e7895b8 | 3157 | |
3158 | /* -- agent forwarding */ | |
3159 | ||
8efc0c15 | 3160 | /* Sends a message to the server to request authentication fd forwarding. */ |
3161 | ||
6ae2364d | 3162 | void |
d5bb9418 | 3163 | auth_request_forwarding(void) |
8efc0c15 | 3164 | { |
5260325f | 3165 | packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING); |
3166 | packet_send(); | |
3167 | packet_write_wait(); | |
8efc0c15 | 3168 | } |