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