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