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fe5bc072 | 1 | /* $OpenBSD: channels.c,v 1.298 2009/11/10 04:30:44 dtucker Exp $ */ |
8efc0c15 | 2 | /* |
5260325f | 3 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
5260325f | 4 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
5 | * All rights reserved | |
5260325f | 6 | * This file contains functions for generic socket connection forwarding. |
7 | * There is also code for initiating connection forwarding for X11 connections, | |
8 | * arbitrary tcp/ip connections, and the authentication agent connection. | |
6ae2364d | 9 | * |
bcbf86ec | 10 | * As far as I am concerned, the code I have written for this software |
11 | * can be used freely for any purpose. Any derived versions of this | |
12 | * software must be clearly marked as such, and if the derived work is | |
13 | * incompatible with the protocol description in the RFC file, it must be | |
14 | * called by a name other than "ssh" or "Secure Shell". | |
15 | * | |
7e7327a1 | 16 | * SSH2 support added by Markus Friedl. |
8341f420 | 17 | * Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved. |
bcbf86ec | 18 | * Copyright (c) 1999 Dug Song. All rights reserved. |
19 | * Copyright (c) 1999 Theo de Raadt. All rights reserved. | |
20 | * | |
21 | * Redistribution and use in source and binary forms, with or without | |
22 | * modification, are permitted provided that the following conditions | |
23 | * are met: | |
24 | * 1. Redistributions of source code must retain the above copyright | |
25 | * notice, this list of conditions and the following disclaimer. | |
26 | * 2. Redistributions in binary form must reproduce the above copyright | |
27 | * notice, this list of conditions and the following disclaimer in the | |
28 | * documentation and/or other materials provided with the distribution. | |
29 | * | |
30 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
31 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
32 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
33 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
34 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
35 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
36 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
37 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
38 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
39 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
5260325f | 40 | */ |
8efc0c15 | 41 | |
42 | #include "includes.h" | |
bd7c69ea | 43 | |
cebb4c24 | 44 | #include <sys/types.h> |
31652869 | 45 | #include <sys/ioctl.h> |
cebb4c24 | 46 | #include <sys/un.h> |
319d6b41 | 47 | #include <sys/socket.h> |
e264ac72 | 48 | #ifdef HAVE_SYS_TIME_H |
49 | # include <sys/time.h> | |
50 | #endif | |
319d6b41 | 51 | |
52 | #include <netinet/in.h> | |
53 | #include <arpa/inet.h> | |
1d3e026f | 54 | |
028094f4 | 55 | #include <errno.h> |
fe5bc072 | 56 | #include <fcntl.h> |
28cb0a43 | 57 | #include <netdb.h> |
cf851879 | 58 | #include <stdio.h> |
ffa517a8 | 59 | #include <stdlib.h> |
00146caa | 60 | #include <string.h> |
1d3e026f | 61 | #include <termios.h> |
5188ba17 | 62 | #include <unistd.h> |
31652869 | 63 | #include <stdarg.h> |
8efc0c15 | 64 | |
3593bdc0 | 65 | #include "openbsd-compat/sys-queue.h" |
31652869 | 66 | #include "xmalloc.h" |
8efc0c15 | 67 | #include "ssh.h" |
42f11eb2 | 68 | #include "ssh1.h" |
69 | #include "ssh2.h" | |
8efc0c15 | 70 | #include "packet.h" |
42f11eb2 | 71 | #include "log.h" |
72 | #include "misc.h" | |
31652869 | 73 | #include "buffer.h" |
8efc0c15 | 74 | #include "channels.h" |
8efc0c15 | 75 | #include "compat.h" |
42f11eb2 | 76 | #include "canohost.h" |
4c8722d9 | 77 | #include "key.h" |
78 | #include "authfd.h" | |
805e659f | 79 | #include "pathnames.h" |
8efc0c15 | 80 | |
8e7895b8 | 81 | /* -- channel core */ |
8efc0c15 | 82 | |
aa3378df | 83 | /* |
84 | * Pointer to an array containing all allocated channels. The array is | |
85 | * dynamically extended as needed. | |
86 | */ | |
719fc62f | 87 | static Channel **channels = NULL; |
8efc0c15 | 88 | |
aa3378df | 89 | /* |
90 | * Size of the channel array. All slots of the array must always be | |
719fc62f | 91 | * initialized (at least the type field); unused slots set to NULL |
aa3378df | 92 | */ |
9a995072 | 93 | static u_int channels_alloc = 0; |
8efc0c15 | 94 | |
aa3378df | 95 | /* |
96 | * Maximum file descriptor value used in any of the channels. This is | |
719fc62f | 97 | * updated in channel_new. |
aa3378df | 98 | */ |
39929cdb | 99 | static int channel_max_fd = 0; |
8efc0c15 | 100 | |
8efc0c15 | 101 | |
8e7895b8 | 102 | /* -- tcp forwarding */ |
8efc0c15 | 103 | |
aa3378df | 104 | /* |
105 | * Data structure for storing which hosts are permitted for forward requests. | |
106 | * The local sides of any remote forwards are stored in this array to prevent | |
107 | * a corrupt remote server from accessing arbitrary TCP/IP ports on our local | |
108 | * network (which might be behind a firewall). | |
109 | */ | |
5260325f | 110 | typedef struct { |
7368a6c8 | 111 | char *host_to_connect; /* Connect to 'host'. */ |
112 | u_short port_to_connect; /* Connect to 'port'. */ | |
113 | u_short listen_port; /* Remote side should listen port number. */ | |
8efc0c15 | 114 | } ForwardPermission; |
115 | ||
2fefbadf | 116 | /* List of all permitted host/port pairs to connect by the user. */ |
8efc0c15 | 117 | static ForwardPermission permitted_opens[SSH_MAX_FORWARDS_PER_DIRECTION]; |
8e7895b8 | 118 | |
2fefbadf | 119 | /* List of all permitted host/port pairs to connect by the admin. */ |
120 | static ForwardPermission permitted_adm_opens[SSH_MAX_FORWARDS_PER_DIRECTION]; | |
121 | ||
122 | /* Number of permitted host/port pairs in the array permitted by the user. */ | |
8efc0c15 | 123 | static int num_permitted_opens = 0; |
2fefbadf | 124 | |
125 | /* Number of permitted host/port pair in the array permitted by the admin. */ | |
126 | static int num_adm_permitted_opens = 0; | |
127 | ||
aa3378df | 128 | /* |
129 | * If this is true, all opens are permitted. This is the case on the server | |
130 | * on which we have to trust the client anyway, and the user could do | |
131 | * anything after logging in anyway. | |
132 | */ | |
8efc0c15 | 133 | static int all_opens_permitted = 0; |
134 | ||
8efc0c15 | 135 | |
8e7895b8 | 136 | /* -- X11 forwarding */ |
42f11eb2 | 137 | |
8e7895b8 | 138 | /* Maximum number of fake X11 displays to try. */ |
139 | #define MAX_DISPLAYS 1000 | |
0490e609 | 140 | |
ef07103c | 141 | /* Saved X11 local (client) display. */ |
142 | static char *x11_saved_display = NULL; | |
143 | ||
8e7895b8 | 144 | /* Saved X11 authentication protocol name. */ |
145 | static char *x11_saved_proto = NULL; | |
8efc0c15 | 146 | |
8e7895b8 | 147 | /* Saved X11 authentication data. This is the real data. */ |
148 | static char *x11_saved_data = NULL; | |
149 | static u_int x11_saved_data_len = 0; | |
150 | ||
151 | /* | |
152 | * Fake X11 authentication data. This is what the server will be sending us; | |
153 | * we should replace any occurrences of this by the real data. | |
154 | */ | |
338eb2ab | 155 | static u_char *x11_fake_data = NULL; |
8e7895b8 | 156 | static u_int x11_fake_data_len; |
157 | ||
158 | ||
159 | /* -- agent forwarding */ | |
8efc0c15 | 160 | |
8e7895b8 | 161 | #define NUM_SOCKS 10 |
162 | ||
8e7895b8 | 163 | /* AF_UNSPEC or AF_INET or AF_INET6 */ |
5e4a7219 | 164 | static int IPv4or6 = AF_UNSPEC; |
8e7895b8 | 165 | |
fe7dba42 | 166 | /* Set the routing domain a.k.a. VRF */ |
167 | static int channel_rdomain = -1; | |
168 | ||
8e7895b8 | 169 | /* helper */ |
396c147e | 170 | static void port_open_helper(Channel *c, char *rtype); |
8e7895b8 | 171 | |
e07e21ad | 172 | /* non-blocking connect helpers */ |
173 | static int connect_next(struct channel_connect *); | |
174 | static void channel_connect_ctx_free(struct channel_connect *); | |
175 | ||
8e7895b8 | 176 | /* -- channel core */ |
7368a6c8 | 177 | |
178 | Channel * | |
b872f7f0 | 179 | channel_by_id(int id) |
7368a6c8 | 180 | { |
181 | Channel *c; | |
719fc62f | 182 | |
9a995072 | 183 | if (id < 0 || (u_int)id >= channels_alloc) { |
b872f7f0 | 184 | logit("channel_by_id: %d: bad id", id); |
7368a6c8 | 185 | return NULL; |
186 | } | |
719fc62f | 187 | c = channels[id]; |
188 | if (c == NULL) { | |
b872f7f0 | 189 | logit("channel_by_id: %d: bad id: channel free", id); |
7368a6c8 | 190 | return NULL; |
191 | } | |
192 | return c; | |
193 | } | |
194 | ||
b872f7f0 | 195 | /* |
196 | * Returns the channel if it is allowed to receive protocol messages. | |
197 | * Private channels, like listening sockets, may not receive messages. | |
198 | */ | |
199 | Channel * | |
200 | channel_lookup(int id) | |
201 | { | |
202 | Channel *c; | |
203 | ||
204 | if ((c = channel_by_id(id)) == NULL) | |
205 | return (NULL); | |
206 | ||
c8e9c167 | 207 | switch (c->type) { |
b872f7f0 | 208 | case SSH_CHANNEL_X11_OPEN: |
209 | case SSH_CHANNEL_LARVAL: | |
210 | case SSH_CHANNEL_CONNECTING: | |
211 | case SSH_CHANNEL_DYNAMIC: | |
212 | case SSH_CHANNEL_OPENING: | |
213 | case SSH_CHANNEL_OPEN: | |
214 | case SSH_CHANNEL_INPUT_DRAINING: | |
215 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
216 | return (c); | |
b872f7f0 | 217 | } |
218 | logit("Non-public channel %d, type %d.", id, c->type); | |
219 | return (NULL); | |
220 | } | |
221 | ||
aa3378df | 222 | /* |
1d1ffb87 | 223 | * Register filedescriptors for a channel, used when allocating a channel or |
0fbe8c74 | 224 | * when the channel consumer/producer is ready, e.g. shell exec'd |
aa3378df | 225 | */ |
396c147e | 226 | static void |
a22aff1f | 227 | channel_register_fds(Channel *c, int rfd, int wfd, int efd, |
b3784859 | 228 | int extusage, int nonblock, int is_tty) |
8efc0c15 | 229 | { |
5260325f | 230 | /* Update the maximum file descriptor value. */ |
39929cdb | 231 | channel_max_fd = MAX(channel_max_fd, rfd); |
232 | channel_max_fd = MAX(channel_max_fd, wfd); | |
233 | channel_max_fd = MAX(channel_max_fd, efd); | |
234 | ||
fe5bc072 | 235 | if (rfd != -1) |
236 | fcntl(rfd, F_SETFD, FD_CLOEXEC); | |
237 | if (wfd != -1 && wfd != rfd) | |
238 | fcntl(wfd, F_SETFD, FD_CLOEXEC); | |
239 | if (efd != -1 && efd != rfd && efd != wfd) | |
240 | fcntl(efd, F_SETFD, FD_CLOEXEC); | |
1d1ffb87 | 241 | |
0fbe8c74 | 242 | c->rfd = rfd; |
243 | c->wfd = wfd; | |
244 | c->sock = (rfd == wfd) ? rfd : -1; | |
5e96b616 | 245 | c->ctl_fd = -1; /* XXX: set elsewhere */ |
0fbe8c74 | 246 | c->efd = efd; |
247 | c->extended_usage = extusage; | |
a22aff1f | 248 | |
b3784859 | 249 | if ((c->isatty = is_tty) != 0) |
d7ac5f18 | 250 | debug2("channel %d: rfd %d isatty", c->self, c->rfd); |
245f4d36 | 251 | c->wfd_isatty = is_tty || isatty(c->wfd); |
0ae4fe1d | 252 | |
a22aff1f | 253 | /* enable nonblocking mode */ |
254 | if (nonblock) { | |
255 | if (rfd != -1) | |
256 | set_nonblock(rfd); | |
257 | if (wfd != -1) | |
258 | set_nonblock(wfd); | |
259 | if (efd != -1) | |
260 | set_nonblock(efd); | |
261 | } | |
0fbe8c74 | 262 | } |
263 | ||
264 | /* | |
265 | * Allocate a new channel object and set its type and socket. This will cause | |
266 | * remote_name to be freed. | |
267 | */ | |
719fc62f | 268 | Channel * |
0fbe8c74 | 269 | channel_new(char *ctype, int type, int rfd, int wfd, int efd, |
f91d9a89 | 270 | u_int window, u_int maxpack, int extusage, char *remote_name, int nonblock) |
0fbe8c74 | 271 | { |
9a995072 | 272 | int found; |
273 | u_int i; | |
0fbe8c74 | 274 | Channel *c; |
5260325f | 275 | |
276 | /* Do initial allocation if this is the first call. */ | |
277 | if (channels_alloc == 0) { | |
278 | channels_alloc = 10; | |
52e3daed | 279 | channels = xcalloc(channels_alloc, sizeof(Channel *)); |
5260325f | 280 | for (i = 0; i < channels_alloc; i++) |
719fc62f | 281 | channels[i] = NULL; |
5260325f | 282 | } |
283 | /* Try to find a free slot where to put the new channel. */ | |
284 | for (found = -1, i = 0; i < channels_alloc; i++) | |
719fc62f | 285 | if (channels[i] == NULL) { |
5260325f | 286 | /* Found a free slot. */ |
9a995072 | 287 | found = (int)i; |
5260325f | 288 | break; |
289 | } | |
9a995072 | 290 | if (found < 0) { |
aa3378df | 291 | /* There are no free slots. Take last+1 slot and expand the array. */ |
5260325f | 292 | found = channels_alloc; |
5df8c731 | 293 | if (channels_alloc > 10000) |
294 | fatal("channel_new: internal error: channels_alloc %d " | |
295 | "too big.", channels_alloc); | |
c5d10563 | 296 | channels = xrealloc(channels, channels_alloc + 10, |
297 | sizeof(Channel *)); | |
20419cc1 | 298 | channels_alloc += 10; |
de273eef | 299 | debug2("channel: expanding %d", channels_alloc); |
5260325f | 300 | for (i = found; i < channels_alloc; i++) |
719fc62f | 301 | channels[i] = NULL; |
5260325f | 302 | } |
719fc62f | 303 | /* Initialize and return new channel. */ |
52e3daed | 304 | c = channels[found] = xcalloc(1, sizeof(Channel)); |
5260325f | 305 | buffer_init(&c->input); |
306 | buffer_init(&c->output); | |
7368a6c8 | 307 | buffer_init(&c->extended); |
1338ba77 | 308 | c->path = NULL; |
70bef40e | 309 | c->ostate = CHAN_OUTPUT_OPEN; |
310 | c->istate = CHAN_INPUT_OPEN; | |
311 | c->flags = 0; | |
c9478090 | 312 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock, 0); |
5260325f | 313 | c->self = found; |
314 | c->type = type; | |
7368a6c8 | 315 | c->ctype = ctype; |
0b242b12 | 316 | c->local_window = window; |
317 | c->local_window_max = window; | |
318 | c->local_consumed = 0; | |
319 | c->local_maxpacket = maxpack; | |
5260325f | 320 | c->remote_id = -1; |
0d942eff | 321 | c->remote_name = xstrdup(remote_name); |
7368a6c8 | 322 | c->remote_window = 0; |
323 | c->remote_maxpacket = 0; | |
a5f82435 | 324 | c->force_drain = 0; |
ac151b18 | 325 | c->single_connection = 0; |
3cf2be58 | 326 | c->detach_user = NULL; |
8cd0437d | 327 | c->detach_close = 0; |
3593bdc0 | 328 | c->open_confirm = NULL; |
329 | c->open_confirm_ctx = NULL; | |
2e73a022 | 330 | c->input_filter = NULL; |
c1c6a032 | 331 | c->output_filter = NULL; |
e74caf1e | 332 | c->filter_ctx = NULL; |
333 | c->filter_cleanup = NULL; | |
3593bdc0 | 334 | TAILQ_INIT(&c->status_confirms); |
5260325f | 335 | debug("channel %d: new [%s]", found, remote_name); |
719fc62f | 336 | return c; |
7368a6c8 | 337 | } |
8efc0c15 | 338 | |
489aa2e9 | 339 | static int |
340 | channel_find_maxfd(void) | |
341 | { | |
9a995072 | 342 | u_int i; |
343 | int max = 0; | |
489aa2e9 | 344 | Channel *c; |
345 | ||
346 | for (i = 0; i < channels_alloc; i++) { | |
347 | c = channels[i]; | |
348 | if (c != NULL) { | |
349 | max = MAX(max, c->rfd); | |
350 | max = MAX(max, c->wfd); | |
351 | max = MAX(max, c->efd); | |
352 | } | |
353 | } | |
354 | return max; | |
355 | } | |
356 | ||
357 | int | |
358 | channel_close_fd(int *fdp) | |
359 | { | |
360 | int ret = 0, fd = *fdp; | |
361 | ||
362 | if (fd != -1) { | |
363 | ret = close(fd); | |
364 | *fdp = -1; | |
365 | if (fd == channel_max_fd) | |
366 | channel_max_fd = channel_find_maxfd(); | |
367 | } | |
368 | return ret; | |
369 | } | |
370 | ||
0fbe8c74 | 371 | /* Close all channel fd/socket. */ |
396c147e | 372 | static void |
0fbe8c74 | 373 | channel_close_fds(Channel *c) |
374 | { | |
5e96b616 | 375 | debug3("channel %d: close_fds r %d w %d e %d c %d", |
376 | c->self, c->rfd, c->wfd, c->efd, c->ctl_fd); | |
6fd8622b | 377 | |
489aa2e9 | 378 | channel_close_fd(&c->sock); |
5e96b616 | 379 | channel_close_fd(&c->ctl_fd); |
489aa2e9 | 380 | channel_close_fd(&c->rfd); |
381 | channel_close_fd(&c->wfd); | |
382 | channel_close_fd(&c->efd); | |
0fbe8c74 | 383 | } |
384 | ||
8e7895b8 | 385 | /* Free the channel and close its fd/socket. */ |
8e7895b8 | 386 | void |
387 | channel_free(Channel *c) | |
388 | { | |
389 | char *s; | |
9a995072 | 390 | u_int i, n; |
3593bdc0 | 391 | struct channel_confirm *cc; |
8e7895b8 | 392 | |
393 | for (n = 0, i = 0; i < channels_alloc; i++) | |
394 | if (channels[i]) | |
395 | n++; | |
9a995072 | 396 | debug("channel %d: free: %s, nchannels %u", c->self, |
8e7895b8 | 397 | c->remote_name ? c->remote_name : "???", n); |
398 | ||
399 | s = channel_open_message(); | |
d7ac5f18 | 400 | debug3("channel %d: status: %s", c->self, s); |
8e7895b8 | 401 | xfree(s); |
402 | ||
8e7895b8 | 403 | if (c->sock != -1) |
404 | shutdown(c->sock, SHUT_RDWR); | |
5e96b616 | 405 | if (c->ctl_fd != -1) |
406 | shutdown(c->ctl_fd, SHUT_RDWR); | |
8e7895b8 | 407 | channel_close_fds(c); |
408 | buffer_free(&c->input); | |
409 | buffer_free(&c->output); | |
410 | buffer_free(&c->extended); | |
411 | if (c->remote_name) { | |
412 | xfree(c->remote_name); | |
413 | c->remote_name = NULL; | |
414 | } | |
1338ba77 | 415 | if (c->path) { |
416 | xfree(c->path); | |
417 | c->path = NULL; | |
418 | } | |
3593bdc0 | 419 | while ((cc = TAILQ_FIRST(&c->status_confirms)) != NULL) { |
420 | if (cc->abandon_cb != NULL) | |
421 | cc->abandon_cb(c, cc->ctx); | |
422 | TAILQ_REMOVE(&c->status_confirms, cc, entry); | |
423 | bzero(cc, sizeof(*cc)); | |
424 | xfree(cc); | |
425 | } | |
e74caf1e | 426 | if (c->filter_cleanup != NULL && c->filter_ctx != NULL) |
427 | c->filter_cleanup(c->self, c->filter_ctx); | |
8e7895b8 | 428 | channels[c->self] = NULL; |
429 | xfree(c); | |
430 | } | |
431 | ||
8e7895b8 | 432 | void |
d6746a0b | 433 | channel_free_all(void) |
8e7895b8 | 434 | { |
9a995072 | 435 | u_int i; |
8e7895b8 | 436 | |
d6746a0b | 437 | for (i = 0; i < channels_alloc; i++) |
438 | if (channels[i] != NULL) | |
439 | channel_free(channels[i]); | |
8e7895b8 | 440 | } |
441 | ||
442 | /* | |
443 | * Closes the sockets/fds of all channels. This is used to close extra file | |
444 | * descriptors after a fork. | |
445 | */ | |
8e7895b8 | 446 | void |
d5bb9418 | 447 | channel_close_all(void) |
8e7895b8 | 448 | { |
9a995072 | 449 | u_int i; |
8e7895b8 | 450 | |
451 | for (i = 0; i < channels_alloc; i++) | |
452 | if (channels[i] != NULL) | |
453 | channel_close_fds(channels[i]); | |
454 | } | |
455 | ||
3cf2be58 | 456 | /* |
457 | * Stop listening to channels. | |
458 | */ | |
3cf2be58 | 459 | void |
460 | channel_stop_listening(void) | |
461 | { | |
9a995072 | 462 | u_int i; |
3cf2be58 | 463 | Channel *c; |
464 | ||
465 | for (i = 0; i < channels_alloc; i++) { | |
466 | c = channels[i]; | |
467 | if (c != NULL) { | |
468 | switch (c->type) { | |
469 | case SSH_CHANNEL_AUTH_SOCKET: | |
470 | case SSH_CHANNEL_PORT_LISTENER: | |
471 | case SSH_CHANNEL_RPORT_LISTENER: | |
472 | case SSH_CHANNEL_X11_LISTENER: | |
489aa2e9 | 473 | channel_close_fd(&c->sock); |
3cf2be58 | 474 | channel_free(c); |
475 | break; | |
476 | } | |
477 | } | |
478 | } | |
479 | } | |
480 | ||
8e7895b8 | 481 | /* |
482 | * Returns true if no channel has too much buffered data, and false if one or | |
483 | * more channel is overfull. | |
484 | */ | |
8e7895b8 | 485 | int |
d5bb9418 | 486 | channel_not_very_much_buffered_data(void) |
8e7895b8 | 487 | { |
488 | u_int i; | |
489 | Channel *c; | |
490 | ||
491 | for (i = 0; i < channels_alloc; i++) { | |
492 | c = channels[i]; | |
493 | if (c != NULL && c->type == SSH_CHANNEL_OPEN) { | |
0c139bd1 | 494 | #if 0 |
495 | if (!compat20 && | |
496 | buffer_len(&c->input) > packet_get_maxsize()) { | |
faa483fa | 497 | debug2("channel %d: big input buffer %d", |
8e7895b8 | 498 | c->self, buffer_len(&c->input)); |
499 | return 0; | |
500 | } | |
0c139bd1 | 501 | #endif |
8e7895b8 | 502 | if (buffer_len(&c->output) > packet_get_maxsize()) { |
a27002e5 | 503 | debug2("channel %d: big output buffer %u > %u", |
0c139bd1 | 504 | c->self, buffer_len(&c->output), |
505 | packet_get_maxsize()); | |
8e7895b8 | 506 | return 0; |
507 | } | |
508 | } | |
509 | } | |
510 | return 1; | |
511 | } | |
512 | ||
513 | /* Returns true if any channel is still open. */ | |
8e7895b8 | 514 | int |
d5bb9418 | 515 | channel_still_open(void) |
8e7895b8 | 516 | { |
9a995072 | 517 | u_int i; |
8e7895b8 | 518 | Channel *c; |
519 | ||
520 | for (i = 0; i < channels_alloc; i++) { | |
521 | c = channels[i]; | |
522 | if (c == NULL) | |
523 | continue; | |
524 | switch (c->type) { | |
525 | case SSH_CHANNEL_X11_LISTENER: | |
526 | case SSH_CHANNEL_PORT_LISTENER: | |
527 | case SSH_CHANNEL_RPORT_LISTENER: | |
528 | case SSH_CHANNEL_CLOSED: | |
529 | case SSH_CHANNEL_AUTH_SOCKET: | |
530 | case SSH_CHANNEL_DYNAMIC: | |
531 | case SSH_CHANNEL_CONNECTING: | |
532 | case SSH_CHANNEL_ZOMBIE: | |
533 | continue; | |
534 | case SSH_CHANNEL_LARVAL: | |
535 | if (!compat20) | |
536 | fatal("cannot happen: SSH_CHANNEL_LARVAL"); | |
537 | continue; | |
538 | case SSH_CHANNEL_OPENING: | |
539 | case SSH_CHANNEL_OPEN: | |
540 | case SSH_CHANNEL_X11_OPEN: | |
541 | return 1; | |
542 | case SSH_CHANNEL_INPUT_DRAINING: | |
543 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
544 | if (!compat13) | |
545 | fatal("cannot happen: OUT_DRAIN"); | |
546 | return 1; | |
547 | default: | |
548 | fatal("channel_still_open: bad channel type %d", c->type); | |
549 | /* NOTREACHED */ | |
550 | } | |
551 | } | |
552 | return 0; | |
553 | } | |
554 | ||
555 | /* Returns the id of an open channel suitable for keepaliving */ | |
8e7895b8 | 556 | int |
d5bb9418 | 557 | channel_find_open(void) |
8e7895b8 | 558 | { |
9a995072 | 559 | u_int i; |
8e7895b8 | 560 | Channel *c; |
561 | ||
562 | for (i = 0; i < channels_alloc; i++) { | |
563 | c = channels[i]; | |
13de3560 | 564 | if (c == NULL || c->remote_id < 0) |
8e7895b8 | 565 | continue; |
566 | switch (c->type) { | |
567 | case SSH_CHANNEL_CLOSED: | |
568 | case SSH_CHANNEL_DYNAMIC: | |
569 | case SSH_CHANNEL_X11_LISTENER: | |
570 | case SSH_CHANNEL_PORT_LISTENER: | |
571 | case SSH_CHANNEL_RPORT_LISTENER: | |
572 | case SSH_CHANNEL_OPENING: | |
573 | case SSH_CHANNEL_CONNECTING: | |
574 | case SSH_CHANNEL_ZOMBIE: | |
575 | continue; | |
576 | case SSH_CHANNEL_LARVAL: | |
577 | case SSH_CHANNEL_AUTH_SOCKET: | |
578 | case SSH_CHANNEL_OPEN: | |
579 | case SSH_CHANNEL_X11_OPEN: | |
580 | return i; | |
581 | case SSH_CHANNEL_INPUT_DRAINING: | |
582 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
583 | if (!compat13) | |
584 | fatal("cannot happen: OUT_DRAIN"); | |
585 | return i; | |
586 | default: | |
587 | fatal("channel_find_open: bad channel type %d", c->type); | |
588 | /* NOTREACHED */ | |
589 | } | |
590 | } | |
591 | return -1; | |
592 | } | |
593 | ||
594 | ||
595 | /* | |
596 | * Returns a message describing the currently open forwarded connections, | |
597 | * suitable for sending to the client. The message contains crlf pairs for | |
598 | * newlines. | |
599 | */ | |
8e7895b8 | 600 | char * |
d5bb9418 | 601 | channel_open_message(void) |
8e7895b8 | 602 | { |
603 | Buffer buffer; | |
604 | Channel *c; | |
605 | char buf[1024], *cp; | |
9a995072 | 606 | u_int i; |
8e7895b8 | 607 | |
608 | buffer_init(&buffer); | |
609 | snprintf(buf, sizeof buf, "The following connections are open:\r\n"); | |
610 | buffer_append(&buffer, buf, strlen(buf)); | |
611 | for (i = 0; i < channels_alloc; i++) { | |
612 | c = channels[i]; | |
613 | if (c == NULL) | |
614 | continue; | |
615 | switch (c->type) { | |
616 | case SSH_CHANNEL_X11_LISTENER: | |
617 | case SSH_CHANNEL_PORT_LISTENER: | |
618 | case SSH_CHANNEL_RPORT_LISTENER: | |
619 | case SSH_CHANNEL_CLOSED: | |
620 | case SSH_CHANNEL_AUTH_SOCKET: | |
621 | case SSH_CHANNEL_ZOMBIE: | |
622 | continue; | |
623 | case SSH_CHANNEL_LARVAL: | |
624 | case SSH_CHANNEL_OPENING: | |
625 | case SSH_CHANNEL_CONNECTING: | |
626 | case SSH_CHANNEL_DYNAMIC: | |
627 | case SSH_CHANNEL_OPEN: | |
628 | case SSH_CHANNEL_X11_OPEN: | |
629 | case SSH_CHANNEL_INPUT_DRAINING: | |
630 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
5e96b616 | 631 | snprintf(buf, sizeof buf, |
632 | " #%d %.300s (t%d r%d i%d/%d o%d/%d fd %d/%d cfd %d)\r\n", | |
8e7895b8 | 633 | c->self, c->remote_name, |
634 | c->type, c->remote_id, | |
635 | c->istate, buffer_len(&c->input), | |
636 | c->ostate, buffer_len(&c->output), | |
5e96b616 | 637 | c->rfd, c->wfd, c->ctl_fd); |
8e7895b8 | 638 | buffer_append(&buffer, buf, strlen(buf)); |
639 | continue; | |
640 | default: | |
641 | fatal("channel_open_message: bad channel type %d", c->type); | |
642 | /* NOTREACHED */ | |
643 | } | |
644 | } | |
645 | buffer_append(&buffer, "\0", 1); | |
646 | cp = xstrdup(buffer_ptr(&buffer)); | |
647 | buffer_free(&buffer); | |
648 | return cp; | |
649 | } | |
650 | ||
651 | void | |
652 | channel_send_open(int id) | |
653 | { | |
654 | Channel *c = channel_lookup(id); | |
e1feb9bf | 655 | |
8e7895b8 | 656 | if (c == NULL) { |
bbe88b6d | 657 | logit("channel_send_open: %d: bad id", id); |
8e7895b8 | 658 | return; |
659 | } | |
6226a8f8 | 660 | debug2("channel %d: send open", id); |
8e7895b8 | 661 | packet_start(SSH2_MSG_CHANNEL_OPEN); |
662 | packet_put_cstring(c->ctype); | |
663 | packet_put_int(c->self); | |
664 | packet_put_int(c->local_window); | |
665 | packet_put_int(c->local_maxpacket); | |
666 | packet_send(); | |
667 | } | |
668 | ||
669 | void | |
6226a8f8 | 670 | channel_request_start(int id, char *service, int wantconfirm) |
8e7895b8 | 671 | { |
6226a8f8 | 672 | Channel *c = channel_lookup(id); |
e1feb9bf | 673 | |
8e7895b8 | 674 | if (c == NULL) { |
bbe88b6d | 675 | logit("channel_request_start: %d: unknown channel id", id); |
8e7895b8 | 676 | return; |
677 | } | |
5e96b616 | 678 | debug2("channel %d: request %s confirm %d", id, service, wantconfirm); |
8e7895b8 | 679 | packet_start(SSH2_MSG_CHANNEL_REQUEST); |
680 | packet_put_int(c->remote_id); | |
681 | packet_put_cstring(service); | |
682 | packet_put_char(wantconfirm); | |
683 | } | |
a7137f6b | 684 | |
8e7895b8 | 685 | void |
3593bdc0 | 686 | channel_register_status_confirm(int id, channel_confirm_cb *cb, |
687 | channel_confirm_abandon_cb *abandon_cb, void *ctx) | |
688 | { | |
689 | struct channel_confirm *cc; | |
690 | Channel *c; | |
691 | ||
692 | if ((c = channel_lookup(id)) == NULL) | |
693 | fatal("channel_register_expect: %d: bad id", id); | |
694 | ||
695 | cc = xmalloc(sizeof(*cc)); | |
696 | cc->cb = cb; | |
697 | cc->abandon_cb = abandon_cb; | |
698 | cc->ctx = ctx; | |
699 | TAILQ_INSERT_TAIL(&c->status_confirms, cc, entry); | |
700 | } | |
701 | ||
702 | void | |
703 | channel_register_open_confirm(int id, channel_callback_fn *fn, void *ctx) | |
8e7895b8 | 704 | { |
705 | Channel *c = channel_lookup(id); | |
e1feb9bf | 706 | |
8e7895b8 | 707 | if (c == NULL) { |
2ea438c2 | 708 | logit("channel_register_open_confirm: %d: bad id", id); |
8e7895b8 | 709 | return; |
710 | } | |
3593bdc0 | 711 | c->open_confirm = fn; |
712 | c->open_confirm_ctx = ctx; | |
8e7895b8 | 713 | } |
a7137f6b | 714 | |
8e7895b8 | 715 | void |
8cd0437d | 716 | channel_register_cleanup(int id, channel_callback_fn *fn, int do_close) |
8e7895b8 | 717 | { |
b872f7f0 | 718 | Channel *c = channel_by_id(id); |
e1feb9bf | 719 | |
8e7895b8 | 720 | if (c == NULL) { |
bbe88b6d | 721 | logit("channel_register_cleanup: %d: bad id", id); |
8e7895b8 | 722 | return; |
723 | } | |
3cf2be58 | 724 | c->detach_user = fn; |
8cd0437d | 725 | c->detach_close = do_close; |
8e7895b8 | 726 | } |
a7137f6b | 727 | |
8e7895b8 | 728 | void |
729 | channel_cancel_cleanup(int id) | |
730 | { | |
b872f7f0 | 731 | Channel *c = channel_by_id(id); |
e1feb9bf | 732 | |
8e7895b8 | 733 | if (c == NULL) { |
bbe88b6d | 734 | logit("channel_cancel_cleanup: %d: bad id", id); |
8e7895b8 | 735 | return; |
736 | } | |
3cf2be58 | 737 | c->detach_user = NULL; |
8cd0437d | 738 | c->detach_close = 0; |
8e7895b8 | 739 | } |
a7137f6b | 740 | |
8e7895b8 | 741 | void |
c1c6a032 | 742 | channel_register_filter(int id, channel_infilter_fn *ifn, |
e74caf1e | 743 | channel_outfilter_fn *ofn, channel_filter_cleanup_fn *cfn, void *ctx) |
8e7895b8 | 744 | { |
745 | Channel *c = channel_lookup(id); | |
e1feb9bf | 746 | |
8e7895b8 | 747 | if (c == NULL) { |
bbe88b6d | 748 | logit("channel_register_filter: %d: bad id", id); |
8e7895b8 | 749 | return; |
750 | } | |
c1c6a032 | 751 | c->input_filter = ifn; |
752 | c->output_filter = ofn; | |
f17f705b | 753 | c->filter_ctx = ctx; |
e74caf1e | 754 | c->filter_cleanup = cfn; |
8e7895b8 | 755 | } |
756 | ||
6ae2364d | 757 | void |
8e7895b8 | 758 | channel_set_fds(int id, int rfd, int wfd, int efd, |
b3784859 | 759 | int extusage, int nonblock, int is_tty, u_int window_max) |
8efc0c15 | 760 | { |
8e7895b8 | 761 | Channel *c = channel_lookup(id); |
e1feb9bf | 762 | |
8e7895b8 | 763 | if (c == NULL || c->type != SSH_CHANNEL_LARVAL) |
764 | fatal("channel_activate for non-larval channel %d.", id); | |
b3784859 | 765 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock, is_tty); |
8e7895b8 | 766 | c->type = SSH_CHANNEL_OPEN; |
399d1ea6 | 767 | c->local_window = c->local_window_max = window_max; |
8e7895b8 | 768 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
769 | packet_put_int(c->remote_id); | |
770 | packet_put_int(c->local_window); | |
771 | packet_send(); | |
8efc0c15 | 772 | } |
773 | ||
aa3378df | 774 | /* |
7368a6c8 | 775 | * 'channel_pre*' are called just before select() to add any bits relevant to |
776 | * channels in the select bitmasks. | |
aa3378df | 777 | */ |
7368a6c8 | 778 | /* |
779 | * 'channel_post*': perform any appropriate operations for channels which | |
780 | * have events pending. | |
781 | */ | |
c8e9c167 | 782 | typedef void chan_fn(Channel *c, fd_set *readset, fd_set *writeset); |
7368a6c8 | 783 | chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE]; |
784 | chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE]; | |
8efc0c15 | 785 | |
ebb90778 | 786 | /* ARGSUSED */ |
396c147e | 787 | static void |
c8e9c167 | 788 | channel_pre_listener(Channel *c, fd_set *readset, fd_set *writeset) |
8efc0c15 | 789 | { |
7368a6c8 | 790 | FD_SET(c->sock, readset); |
791 | } | |
5260325f | 792 | |
ebb90778 | 793 | /* ARGSUSED */ |
396c147e | 794 | static void |
c8e9c167 | 795 | channel_pre_connecting(Channel *c, fd_set *readset, fd_set *writeset) |
97fb6912 | 796 | { |
797 | debug3("channel %d: waiting for connection", c->self); | |
798 | FD_SET(c->sock, writeset); | |
799 | } | |
800 | ||
396c147e | 801 | static void |
c8e9c167 | 802 | channel_pre_open_13(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 803 | { |
804 | if (buffer_len(&c->input) < packet_get_maxsize()) | |
805 | FD_SET(c->sock, readset); | |
806 | if (buffer_len(&c->output) > 0) | |
807 | FD_SET(c->sock, writeset); | |
808 | } | |
5260325f | 809 | |
396c147e | 810 | static void |
c8e9c167 | 811 | channel_pre_open(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 812 | { |
0c0738d5 | 813 | u_int limit = compat20 ? c->remote_window : packet_get_maxsize(); |
5260325f | 814 | |
7e7327a1 | 815 | if (c->istate == CHAN_INPUT_OPEN && |
0c0738d5 | 816 | limit > 0 && |
69d9d413 | 817 | buffer_len(&c->input) < limit && |
818 | buffer_check_alloc(&c->input, CHAN_RBUF)) | |
7e7327a1 | 819 | FD_SET(c->rfd, readset); |
820 | if (c->ostate == CHAN_OUTPUT_OPEN || | |
821 | c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { | |
822 | if (buffer_len(&c->output) > 0) { | |
823 | FD_SET(c->wfd, writeset); | |
824 | } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { | |
d2296ed7 | 825 | if (CHANNEL_EFD_OUTPUT_ACTIVE(c)) |
4e2e5cfd | 826 | debug2("channel %d: obuf_empty delayed efd %d/(%d)", |
827 | c->self, c->efd, buffer_len(&c->extended)); | |
d2296ed7 | 828 | else |
829 | chan_obuf_empty(c); | |
7e7327a1 | 830 | } |
831 | } | |
832 | /** XXX check close conditions, too */ | |
271f4a13 | 833 | if (compat20 && c->efd != -1 && |
834 | !(c->istate == CHAN_INPUT_CLOSED && c->ostate == CHAN_OUTPUT_CLOSED)) { | |
7e7327a1 | 835 | if (c->extended_usage == CHAN_EXTENDED_WRITE && |
836 | buffer_len(&c->extended) > 0) | |
837 | FD_SET(c->efd, writeset); | |
d2296ed7 | 838 | else if (!(c->flags & CHAN_EOF_SENT) && |
839 | c->extended_usage == CHAN_EXTENDED_READ && | |
7e7327a1 | 840 | buffer_len(&c->extended) < c->remote_window) |
841 | FD_SET(c->efd, readset); | |
842 | } | |
5e96b616 | 843 | /* XXX: What about efd? races? */ |
f2107e97 | 844 | if (compat20 && c->ctl_fd != -1 && |
5e96b616 | 845 | c->istate == CHAN_INPUT_OPEN && c->ostate == CHAN_OUTPUT_OPEN) |
846 | FD_SET(c->ctl_fd, readset); | |
7e7327a1 | 847 | } |
848 | ||
ebb90778 | 849 | /* ARGSUSED */ |
396c147e | 850 | static void |
c8e9c167 | 851 | channel_pre_input_draining(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 852 | { |
853 | if (buffer_len(&c->input) == 0) { | |
854 | packet_start(SSH_MSG_CHANNEL_CLOSE); | |
855 | packet_put_int(c->remote_id); | |
856 | packet_send(); | |
857 | c->type = SSH_CHANNEL_CLOSED; | |
d7ac5f18 | 858 | debug2("channel %d: closing after input drain.", c->self); |
7368a6c8 | 859 | } |
860 | } | |
5260325f | 861 | |
ebb90778 | 862 | /* ARGSUSED */ |
396c147e | 863 | static void |
c8e9c167 | 864 | channel_pre_output_draining(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 865 | { |
866 | if (buffer_len(&c->output) == 0) | |
719fc62f | 867 | chan_mark_dead(c); |
6ae2364d | 868 | else |
7368a6c8 | 869 | FD_SET(c->sock, writeset); |
870 | } | |
5260325f | 871 | |
7368a6c8 | 872 | /* |
873 | * This is a special state for X11 authentication spoofing. An opened X11 | |
874 | * connection (when authentication spoofing is being done) remains in this | |
875 | * state until the first packet has been completely read. The authentication | |
876 | * data in that packet is then substituted by the real data if it matches the | |
877 | * fake data, and the channel is put into normal mode. | |
0b242b12 | 878 | * XXX All this happens at the client side. |
8e7895b8 | 879 | * Returns: 0 = need more data, -1 = wrong cookie, 1 = ok |
7368a6c8 | 880 | */ |
396c147e | 881 | static int |
8e7895b8 | 882 | x11_open_helper(Buffer *b) |
7368a6c8 | 883 | { |
1e3b8b07 | 884 | u_char *ucp; |
885 | u_int proto_len, data_len; | |
5260325f | 886 | |
7368a6c8 | 887 | /* Check if the fixed size part of the packet is in buffer. */ |
8e7895b8 | 888 | if (buffer_len(b) < 12) |
7368a6c8 | 889 | return 0; |
890 | ||
891 | /* Parse the lengths of variable-length fields. */ | |
20905a8e | 892 | ucp = buffer_ptr(b); |
7368a6c8 | 893 | if (ucp[0] == 0x42) { /* Byte order MSB first. */ |
894 | proto_len = 256 * ucp[6] + ucp[7]; | |
895 | data_len = 256 * ucp[8] + ucp[9]; | |
896 | } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */ | |
897 | proto_len = ucp[6] + 256 * ucp[7]; | |
898 | data_len = ucp[8] + 256 * ucp[9]; | |
899 | } else { | |
d7ac5f18 | 900 | debug2("Initial X11 packet contains bad byte order byte: 0x%x", |
184eed6a | 901 | ucp[0]); |
7368a6c8 | 902 | return -1; |
903 | } | |
5260325f | 904 | |
7368a6c8 | 905 | /* Check if the whole packet is in buffer. */ |
8e7895b8 | 906 | if (buffer_len(b) < |
7368a6c8 | 907 | 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3)) |
908 | return 0; | |
5260325f | 909 | |
7368a6c8 | 910 | /* Check if authentication protocol matches. */ |
911 | if (proto_len != strlen(x11_saved_proto) || | |
912 | memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) { | |
d7ac5f18 | 913 | debug2("X11 connection uses different authentication protocol."); |
7368a6c8 | 914 | return -1; |
915 | } | |
916 | /* Check if authentication data matches our fake data. */ | |
917 | if (data_len != x11_fake_data_len || | |
918 | memcmp(ucp + 12 + ((proto_len + 3) & ~3), | |
919 | x11_fake_data, x11_fake_data_len) != 0) { | |
d7ac5f18 | 920 | debug2("X11 auth data does not match fake data."); |
7368a6c8 | 921 | return -1; |
922 | } | |
923 | /* Check fake data length */ | |
924 | if (x11_fake_data_len != x11_saved_data_len) { | |
925 | error("X11 fake_data_len %d != saved_data_len %d", | |
926 | x11_fake_data_len, x11_saved_data_len); | |
927 | return -1; | |
928 | } | |
929 | /* | |
930 | * Received authentication protocol and data match | |
931 | * our fake data. Substitute the fake data with real | |
932 | * data. | |
933 | */ | |
934 | memcpy(ucp + 12 + ((proto_len + 3) & ~3), | |
935 | x11_saved_data, x11_saved_data_len); | |
936 | return 1; | |
937 | } | |
5260325f | 938 | |
396c147e | 939 | static void |
c8e9c167 | 940 | channel_pre_x11_open_13(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 941 | { |
8e7895b8 | 942 | int ret = x11_open_helper(&c->output); |
e1feb9bf | 943 | |
7368a6c8 | 944 | if (ret == 1) { |
945 | /* Start normal processing for the channel. */ | |
946 | c->type = SSH_CHANNEL_OPEN; | |
a8be9f80 | 947 | channel_pre_open_13(c, readset, writeset); |
7368a6c8 | 948 | } else if (ret == -1) { |
949 | /* | |
950 | * We have received an X11 connection that has bad | |
951 | * authentication information. | |
952 | */ | |
bbe88b6d | 953 | logit("X11 connection rejected because of wrong authentication."); |
7368a6c8 | 954 | buffer_clear(&c->input); |
955 | buffer_clear(&c->output); | |
489aa2e9 | 956 | channel_close_fd(&c->sock); |
7368a6c8 | 957 | c->sock = -1; |
958 | c->type = SSH_CHANNEL_CLOSED; | |
959 | packet_start(SSH_MSG_CHANNEL_CLOSE); | |
960 | packet_put_int(c->remote_id); | |
961 | packet_send(); | |
962 | } | |
963 | } | |
5260325f | 964 | |
396c147e | 965 | static void |
c8e9c167 | 966 | channel_pre_x11_open(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 967 | { |
8e7895b8 | 968 | int ret = x11_open_helper(&c->output); |
a5f82435 | 969 | |
970 | /* c->force_drain = 1; */ | |
971 | ||
7368a6c8 | 972 | if (ret == 1) { |
973 | c->type = SSH_CHANNEL_OPEN; | |
0c0738d5 | 974 | channel_pre_open(c, readset, writeset); |
7368a6c8 | 975 | } else if (ret == -1) { |
bbe88b6d | 976 | logit("X11 connection rejected because of wrong authentication."); |
d7ac5f18 | 977 | debug2("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate); |
8341f420 | 978 | chan_read_failed(c); |
979 | buffer_clear(&c->input); | |
980 | chan_ibuf_empty(c); | |
981 | buffer_clear(&c->output); | |
982 | /* for proto v1, the peer will send an IEOF */ | |
983 | if (compat20) | |
984 | chan_write_failed(c); | |
985 | else | |
986 | c->type = SSH_CHANNEL_OPEN; | |
d7ac5f18 | 987 | debug2("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate); |
7368a6c8 | 988 | } |
989 | } | |
5260325f | 990 | |
28b9cb4d | 991 | /* try to decode a socks4 header */ |
ebb90778 | 992 | /* ARGSUSED */ |
396c147e | 993 | static int |
c8e9c167 | 994 | channel_decode_socks4(Channel *c, fd_set *readset, fd_set *writeset) |
0490e609 | 995 | { |
661e45a0 | 996 | char *p, *host; |
4866a6d6 | 997 | u_int len, have, i, found, need; |
184eed6a | 998 | char username[256]; |
0490e609 | 999 | struct { |
1000 | u_int8_t version; | |
1001 | u_int8_t command; | |
1002 | u_int16_t dest_port; | |
28b9cb4d | 1003 | struct in_addr dest_addr; |
0490e609 | 1004 | } s4_req, s4_rsp; |
1005 | ||
28b9cb4d | 1006 | debug2("channel %d: decode socks4", c->self); |
53b8fe68 | 1007 | |
1008 | have = buffer_len(&c->input); | |
1009 | len = sizeof(s4_req); | |
1010 | if (have < len) | |
1011 | return 0; | |
1012 | p = buffer_ptr(&c->input); | |
4866a6d6 | 1013 | |
1014 | need = 1; | |
1015 | /* SOCKS4A uses an invalid IP address 0.0.0.x */ | |
1016 | if (p[4] == 0 && p[5] == 0 && p[6] == 0 && p[7] != 0) { | |
1017 | debug2("channel %d: socks4a request", c->self); | |
1018 | /* ... and needs an extra string (the hostname) */ | |
1019 | need = 2; | |
1020 | } | |
1021 | /* Check for terminating NUL on the string(s) */ | |
53b8fe68 | 1022 | for (found = 0, i = len; i < have; i++) { |
1023 | if (p[i] == '\0') { | |
4866a6d6 | 1024 | found++; |
1025 | if (found == need) | |
1026 | break; | |
53b8fe68 | 1027 | } |
1028 | if (i > 1024) { | |
1029 | /* the peer is probably sending garbage */ | |
1030 | debug("channel %d: decode socks4: too long", | |
1031 | c->self); | |
1032 | return -1; | |
1033 | } | |
1034 | } | |
4866a6d6 | 1035 | if (found < need) |
53b8fe68 | 1036 | return 0; |
0490e609 | 1037 | buffer_get(&c->input, (char *)&s4_req.version, 1); |
1038 | buffer_get(&c->input, (char *)&s4_req.command, 1); | |
1039 | buffer_get(&c->input, (char *)&s4_req.dest_port, 2); | |
28b9cb4d | 1040 | buffer_get(&c->input, (char *)&s4_req.dest_addr, 4); |
53b8fe68 | 1041 | have = buffer_len(&c->input); |
0490e609 | 1042 | p = buffer_ptr(&c->input); |
1043 | len = strlen(p); | |
6683b40f | 1044 | debug2("channel %d: decode socks4: user %s/%d", c->self, p, len); |
4866a6d6 | 1045 | len++; /* trailing '\0' */ |
0490e609 | 1046 | if (len > have) |
28b9cb4d | 1047 | fatal("channel %d: decode socks4: len %d > have %d", |
0490e609 | 1048 | c->self, len, have); |
1049 | strlcpy(username, p, sizeof(username)); | |
1050 | buffer_consume(&c->input, len); | |
0490e609 | 1051 | |
1338ba77 | 1052 | if (c->path != NULL) { |
1053 | xfree(c->path); | |
1054 | c->path = NULL; | |
1055 | } | |
4866a6d6 | 1056 | if (need == 1) { /* SOCKS4: one string */ |
1057 | host = inet_ntoa(s4_req.dest_addr); | |
1338ba77 | 1058 | c->path = xstrdup(host); |
4866a6d6 | 1059 | } else { /* SOCKS4A: two strings */ |
1060 | have = buffer_len(&c->input); | |
1061 | p = buffer_ptr(&c->input); | |
1062 | len = strlen(p); | |
1063 | debug2("channel %d: decode socks4a: host %s/%d", | |
1064 | c->self, p, len); | |
1065 | len++; /* trailing '\0' */ | |
1066 | if (len > have) | |
1067 | fatal("channel %d: decode socks4a: len %d > have %d", | |
1068 | c->self, len, have); | |
1338ba77 | 1069 | if (len > NI_MAXHOST) { |
4866a6d6 | 1070 | error("channel %d: hostname \"%.100s\" too long", |
1071 | c->self, p); | |
1072 | return -1; | |
1073 | } | |
1338ba77 | 1074 | c->path = xstrdup(p); |
4866a6d6 | 1075 | buffer_consume(&c->input, len); |
1076 | } | |
0490e609 | 1077 | c->host_port = ntohs(s4_req.dest_port); |
184eed6a | 1078 | |
d7ac5f18 | 1079 | debug2("channel %d: dynamic request: socks4 host %s port %u command %u", |
4866a6d6 | 1080 | c->self, c->path, c->host_port, s4_req.command); |
0490e609 | 1081 | |
28b9cb4d | 1082 | if (s4_req.command != 1) { |
4866a6d6 | 1083 | debug("channel %d: cannot handle: %s cn %d", |
1084 | c->self, need == 1 ? "SOCKS4" : "SOCKS4A", s4_req.command); | |
28b9cb4d | 1085 | return -1; |
0490e609 | 1086 | } |
28b9cb4d | 1087 | s4_rsp.version = 0; /* vn: 0 for reply */ |
1088 | s4_rsp.command = 90; /* cd: req granted */ | |
0490e609 | 1089 | s4_rsp.dest_port = 0; /* ignored */ |
28b9cb4d | 1090 | s4_rsp.dest_addr.s_addr = INADDR_ANY; /* ignored */ |
15dd2c4f | 1091 | buffer_append(&c->output, &s4_rsp, sizeof(s4_rsp)); |
28b9cb4d | 1092 | return 1; |
0490e609 | 1093 | } |
1094 | ||
f49658f5 | 1095 | /* try to decode a socks5 header */ |
1096 | #define SSH_SOCKS5_AUTHDONE 0x1000 | |
1097 | #define SSH_SOCKS5_NOAUTH 0x00 | |
1098 | #define SSH_SOCKS5_IPV4 0x01 | |
1099 | #define SSH_SOCKS5_DOMAIN 0x03 | |
1100 | #define SSH_SOCKS5_IPV6 0x04 | |
1101 | #define SSH_SOCKS5_CONNECT 0x01 | |
1102 | #define SSH_SOCKS5_SUCCESS 0x00 | |
1103 | ||
ebb90778 | 1104 | /* ARGSUSED */ |
f49658f5 | 1105 | static int |
c8e9c167 | 1106 | channel_decode_socks5(Channel *c, fd_set *readset, fd_set *writeset) |
f49658f5 | 1107 | { |
1108 | struct { | |
1109 | u_int8_t version; | |
1110 | u_int8_t command; | |
1111 | u_int8_t reserved; | |
1112 | u_int8_t atyp; | |
1113 | } s5_req, s5_rsp; | |
1114 | u_int16_t dest_port; | |
1338ba77 | 1115 | u_char *p, dest_addr[255+1], ntop[INET6_ADDRSTRLEN]; |
a217e418 | 1116 | u_int have, need, i, found, nmethods, addrlen, af; |
f49658f5 | 1117 | |
1118 | debug2("channel %d: decode socks5", c->self); | |
1119 | p = buffer_ptr(&c->input); | |
1120 | if (p[0] != 0x05) | |
1121 | return -1; | |
1122 | have = buffer_len(&c->input); | |
1123 | if (!(c->flags & SSH_SOCKS5_AUTHDONE)) { | |
1124 | /* format: ver | nmethods | methods */ | |
aff51935 | 1125 | if (have < 2) |
f49658f5 | 1126 | return 0; |
1127 | nmethods = p[1]; | |
1128 | if (have < nmethods + 2) | |
1129 | return 0; | |
1130 | /* look for method: "NO AUTHENTICATION REQUIRED" */ | |
4f6e2ba9 | 1131 | for (found = 0, i = 2; i < nmethods + 2; i++) { |
d4f40d92 | 1132 | if (p[i] == SSH_SOCKS5_NOAUTH) { |
f49658f5 | 1133 | found = 1; |
1134 | break; | |
1135 | } | |
1136 | } | |
1137 | if (!found) { | |
1138 | debug("channel %d: method SSH_SOCKS5_NOAUTH not found", | |
1139 | c->self); | |
1140 | return -1; | |
1141 | } | |
1142 | buffer_consume(&c->input, nmethods + 2); | |
1143 | buffer_put_char(&c->output, 0x05); /* version */ | |
1144 | buffer_put_char(&c->output, SSH_SOCKS5_NOAUTH); /* method */ | |
1145 | FD_SET(c->sock, writeset); | |
1146 | c->flags |= SSH_SOCKS5_AUTHDONE; | |
1147 | debug2("channel %d: socks5 auth done", c->self); | |
1148 | return 0; /* need more */ | |
1149 | } | |
1150 | debug2("channel %d: socks5 post auth", c->self); | |
1151 | if (have < sizeof(s5_req)+1) | |
1152 | return 0; /* need more */ | |
5b5f6af7 | 1153 | memcpy(&s5_req, p, sizeof(s5_req)); |
f49658f5 | 1154 | if (s5_req.version != 0x05 || |
1155 | s5_req.command != SSH_SOCKS5_CONNECT || | |
1156 | s5_req.reserved != 0x00) { | |
d7ac5f18 | 1157 | debug2("channel %d: only socks5 connect supported", c->self); |
f49658f5 | 1158 | return -1; |
1159 | } | |
f8cc7664 | 1160 | switch (s5_req.atyp){ |
f49658f5 | 1161 | case SSH_SOCKS5_IPV4: |
1162 | addrlen = 4; | |
1163 | af = AF_INET; | |
1164 | break; | |
1165 | case SSH_SOCKS5_DOMAIN: | |
1166 | addrlen = p[sizeof(s5_req)]; | |
1167 | af = -1; | |
1168 | break; | |
1169 | case SSH_SOCKS5_IPV6: | |
1170 | addrlen = 16; | |
1171 | af = AF_INET6; | |
1172 | break; | |
1173 | default: | |
d7ac5f18 | 1174 | debug2("channel %d: bad socks5 atyp %d", c->self, s5_req.atyp); |
f49658f5 | 1175 | return -1; |
1176 | } | |
a217e418 | 1177 | need = sizeof(s5_req) + addrlen + 2; |
1178 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) | |
1179 | need++; | |
1180 | if (have < need) | |
f49658f5 | 1181 | return 0; |
1182 | buffer_consume(&c->input, sizeof(s5_req)); | |
1183 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) | |
1184 | buffer_consume(&c->input, 1); /* host string length */ | |
1185 | buffer_get(&c->input, (char *)&dest_addr, addrlen); | |
1186 | buffer_get(&c->input, (char *)&dest_port, 2); | |
1187 | dest_addr[addrlen] = '\0'; | |
1338ba77 | 1188 | if (c->path != NULL) { |
1189 | xfree(c->path); | |
1190 | c->path = NULL; | |
1191 | } | |
1192 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) { | |
920706fd | 1193 | if (addrlen >= NI_MAXHOST) { |
1338ba77 | 1194 | error("channel %d: dynamic request: socks5 hostname " |
1195 | "\"%.100s\" too long", c->self, dest_addr); | |
1196 | return -1; | |
1197 | } | |
1198 | c->path = xstrdup(dest_addr); | |
1199 | } else { | |
1200 | if (inet_ntop(af, dest_addr, ntop, sizeof(ntop)) == NULL) | |
1201 | return -1; | |
1202 | c->path = xstrdup(ntop); | |
1203 | } | |
f49658f5 | 1204 | c->host_port = ntohs(dest_port); |
b6453d99 | 1205 | |
d7ac5f18 | 1206 | debug2("channel %d: dynamic request: socks5 host %s port %u command %u", |
f49658f5 | 1207 | c->self, c->path, c->host_port, s5_req.command); |
1208 | ||
1209 | s5_rsp.version = 0x05; | |
1210 | s5_rsp.command = SSH_SOCKS5_SUCCESS; | |
1211 | s5_rsp.reserved = 0; /* ignored */ | |
1212 | s5_rsp.atyp = SSH_SOCKS5_IPV4; | |
1213 | ((struct in_addr *)&dest_addr)->s_addr = INADDR_ANY; | |
1214 | dest_port = 0; /* ignored */ | |
1215 | ||
15dd2c4f | 1216 | buffer_append(&c->output, &s5_rsp, sizeof(s5_rsp)); |
1217 | buffer_append(&c->output, &dest_addr, sizeof(struct in_addr)); | |
1218 | buffer_append(&c->output, &dest_port, sizeof(dest_port)); | |
f49658f5 | 1219 | return 1; |
1220 | } | |
1221 | ||
28b9cb4d | 1222 | /* dynamic port forwarding */ |
396c147e | 1223 | static void |
c8e9c167 | 1224 | channel_pre_dynamic(Channel *c, fd_set *readset, fd_set *writeset) |
28b9cb4d | 1225 | { |
1226 | u_char *p; | |
2ceb8101 | 1227 | u_int have; |
1228 | int ret; | |
28b9cb4d | 1229 | |
1230 | have = buffer_len(&c->input); | |
639cb8ab | 1231 | c->delayed = 0; |
28b9cb4d | 1232 | debug2("channel %d: pre_dynamic: have %d", c->self, have); |
070adba2 | 1233 | /* buffer_dump(&c->input); */ |
28b9cb4d | 1234 | /* check if the fixed size part of the packet is in buffer. */ |
f49658f5 | 1235 | if (have < 3) { |
28b9cb4d | 1236 | /* need more */ |
1237 | FD_SET(c->sock, readset); | |
1238 | return; | |
1239 | } | |
1240 | /* try to guess the protocol */ | |
1241 | p = buffer_ptr(&c->input); | |
1242 | switch (p[0]) { | |
6683b40f | 1243 | case 0x04: |
1244 | ret = channel_decode_socks4(c, readset, writeset); | |
1245 | break; | |
f49658f5 | 1246 | case 0x05: |
1247 | ret = channel_decode_socks5(c, readset, writeset); | |
1248 | break; | |
28b9cb4d | 1249 | default: |
1250 | ret = -1; | |
1251 | break; | |
1252 | } | |
1253 | if (ret < 0) { | |
719fc62f | 1254 | chan_mark_dead(c); |
28b9cb4d | 1255 | } else if (ret == 0) { |
1256 | debug2("channel %d: pre_dynamic: need more", c->self); | |
1257 | /* need more */ | |
1258 | FD_SET(c->sock, readset); | |
1259 | } else { | |
1260 | /* switch to the next state */ | |
1261 | c->type = SSH_CHANNEL_OPENING; | |
1262 | port_open_helper(c, "direct-tcpip"); | |
1263 | } | |
1264 | } | |
0490e609 | 1265 | |
7368a6c8 | 1266 | /* This is our fake X11 server socket. */ |
ebb90778 | 1267 | /* ARGSUSED */ |
396c147e | 1268 | static void |
c8e9c167 | 1269 | channel_post_x11_listener(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1270 | { |
719fc62f | 1271 | Channel *nc; |
9fb764ab | 1272 | struct sockaddr_storage addr; |
bcc0381e | 1273 | int newsock; |
7368a6c8 | 1274 | socklen_t addrlen; |
865ac82e | 1275 | char buf[16384], *remote_ipaddr; |
0b242b12 | 1276 | int remote_port; |
7368a6c8 | 1277 | |
1278 | if (FD_ISSET(c->sock, readset)) { | |
1279 | debug("X11 connection requested."); | |
1280 | addrlen = sizeof(addr); | |
9fb764ab | 1281 | newsock = accept(c->sock, (struct sockaddr *)&addr, &addrlen); |
ac151b18 | 1282 | if (c->single_connection) { |
d7ac5f18 | 1283 | debug2("single_connection: closing X11 listener."); |
ac151b18 | 1284 | channel_close_fd(&c->sock); |
1285 | chan_mark_dead(c); | |
1286 | } | |
7368a6c8 | 1287 | if (newsock < 0) { |
1288 | error("accept: %.100s", strerror(errno)); | |
1289 | return; | |
5260325f | 1290 | } |
bcc0381e | 1291 | set_nodelay(newsock); |
865ac82e | 1292 | remote_ipaddr = get_peer_ipaddr(newsock); |
0b242b12 | 1293 | remote_port = get_peer_port(newsock); |
7368a6c8 | 1294 | snprintf(buf, sizeof buf, "X11 connection from %.200s port %d", |
865ac82e | 1295 | remote_ipaddr, remote_port); |
0b242b12 | 1296 | |
719fc62f | 1297 | nc = channel_new("accepted x11 socket", |
0b242b12 | 1298 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
0d942eff | 1299 | c->local_window_max, c->local_maxpacket, 0, buf, 1); |
0b242b12 | 1300 | if (compat20) { |
1301 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1302 | packet_put_cstring("x11"); | |
719fc62f | 1303 | packet_put_int(nc->self); |
ac151b18 | 1304 | packet_put_int(nc->local_window_max); |
1305 | packet_put_int(nc->local_maxpacket); | |
865ac82e | 1306 | /* originator ipaddr and port */ |
1307 | packet_put_cstring(remote_ipaddr); | |
d0c832f3 | 1308 | if (datafellows & SSH_BUG_X11FWD) { |
d7ac5f18 | 1309 | debug2("ssh2 x11 bug compat mode"); |
d0c832f3 | 1310 | } else { |
1311 | packet_put_int(remote_port); | |
1312 | } | |
0b242b12 | 1313 | packet_send(); |
1314 | } else { | |
1315 | packet_start(SSH_SMSG_X11_OPEN); | |
719fc62f | 1316 | packet_put_int(nc->self); |
8e7895b8 | 1317 | if (packet_get_protocol_flags() & |
1318 | SSH_PROTOFLAG_HOST_IN_FWD_OPEN) | |
449c5ba5 | 1319 | packet_put_cstring(buf); |
0b242b12 | 1320 | packet_send(); |
1321 | } | |
865ac82e | 1322 | xfree(remote_ipaddr); |
8efc0c15 | 1323 | } |
8efc0c15 | 1324 | } |
1325 | ||
396c147e | 1326 | static void |
0490e609 | 1327 | port_open_helper(Channel *c, char *rtype) |
1328 | { | |
1329 | int direct; | |
1330 | char buf[1024]; | |
1331 | char *remote_ipaddr = get_peer_ipaddr(c->sock); | |
29798ed0 | 1332 | int remote_port = get_peer_port(c->sock); |
0490e609 | 1333 | |
1334 | direct = (strcmp(rtype, "direct-tcpip") == 0); | |
1335 | ||
1336 | snprintf(buf, sizeof buf, | |
1337 | "%s: listening port %d for %.100s port %d, " | |
1338 | "connect from %.200s port %d", | |
1339 | rtype, c->listening_port, c->path, c->host_port, | |
1340 | remote_ipaddr, remote_port); | |
1341 | ||
1342 | xfree(c->remote_name); | |
1343 | c->remote_name = xstrdup(buf); | |
1344 | ||
1345 | if (compat20) { | |
1346 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1347 | packet_put_cstring(rtype); | |
1348 | packet_put_int(c->self); | |
1349 | packet_put_int(c->local_window_max); | |
1350 | packet_put_int(c->local_maxpacket); | |
1351 | if (direct) { | |
1352 | /* target host, port */ | |
1353 | packet_put_cstring(c->path); | |
1354 | packet_put_int(c->host_port); | |
1355 | } else { | |
1356 | /* listen address, port */ | |
1357 | packet_put_cstring(c->path); | |
1358 | packet_put_int(c->listening_port); | |
1359 | } | |
1360 | /* originator host and port */ | |
1361 | packet_put_cstring(remote_ipaddr); | |
29798ed0 | 1362 | packet_put_int((u_int)remote_port); |
0490e609 | 1363 | packet_send(); |
1364 | } else { | |
1365 | packet_start(SSH_MSG_PORT_OPEN); | |
1366 | packet_put_int(c->self); | |
1367 | packet_put_cstring(c->path); | |
1368 | packet_put_int(c->host_port); | |
8e7895b8 | 1369 | if (packet_get_protocol_flags() & |
1370 | SSH_PROTOFLAG_HOST_IN_FWD_OPEN) | |
0490e609 | 1371 | packet_put_cstring(c->remote_name); |
1372 | packet_send(); | |
1373 | } | |
1374 | xfree(remote_ipaddr); | |
1375 | } | |
1376 | ||
442aee3a | 1377 | static void |
1378 | channel_set_reuseaddr(int fd) | |
1379 | { | |
1380 | int on = 1; | |
1381 | ||
1382 | /* | |
1383 | * Set socket options. | |
1384 | * Allow local port reuse in TIME_WAIT. | |
1385 | */ | |
1386 | if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1) | |
1387 | error("setsockopt SO_REUSEADDR fd %d: %s", fd, strerror(errno)); | |
1388 | } | |
1389 | ||
aa3378df | 1390 | /* |
7368a6c8 | 1391 | * This socket is listening for connections to a forwarded TCP/IP port. |
aa3378df | 1392 | */ |
ebb90778 | 1393 | /* ARGSUSED */ |
396c147e | 1394 | static void |
c8e9c167 | 1395 | channel_post_port_listener(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1396 | { |
0490e609 | 1397 | Channel *nc; |
9fb764ab | 1398 | struct sockaddr_storage addr; |
719fc62f | 1399 | int newsock, nextstate; |
7368a6c8 | 1400 | socklen_t addrlen; |
0490e609 | 1401 | char *rtype; |
fa08c86b | 1402 | |
7368a6c8 | 1403 | if (FD_ISSET(c->sock, readset)) { |
1404 | debug("Connection to port %d forwarding " | |
1405 | "to %.100s port %d requested.", | |
1406 | c->listening_port, c->path, c->host_port); | |
0490e609 | 1407 | |
639cb8ab | 1408 | if (c->type == SSH_CHANNEL_RPORT_LISTENER) { |
1409 | nextstate = SSH_CHANNEL_OPENING; | |
1410 | rtype = "forwarded-tcpip"; | |
1411 | } else { | |
1412 | if (c->host_port == 0) { | |
1413 | nextstate = SSH_CHANNEL_DYNAMIC; | |
f3964cb9 | 1414 | rtype = "dynamic-tcpip"; |
639cb8ab | 1415 | } else { |
1416 | nextstate = SSH_CHANNEL_OPENING; | |
1417 | rtype = "direct-tcpip"; | |
1418 | } | |
1419 | } | |
0490e609 | 1420 | |
7368a6c8 | 1421 | addrlen = sizeof(addr); |
9fb764ab | 1422 | newsock = accept(c->sock, (struct sockaddr *)&addr, &addrlen); |
7368a6c8 | 1423 | if (newsock < 0) { |
1424 | error("accept: %.100s", strerror(errno)); | |
1425 | return; | |
1426 | } | |
811a6342 | 1427 | set_nodelay(newsock); |
0d942eff | 1428 | nc = channel_new(rtype, nextstate, newsock, newsock, -1, |
1429 | c->local_window_max, c->local_maxpacket, 0, rtype, 1); | |
0490e609 | 1430 | nc->listening_port = c->listening_port; |
1431 | nc->host_port = c->host_port; | |
1338ba77 | 1432 | if (c->path != NULL) |
1433 | nc->path = xstrdup(c->path); | |
0490e609 | 1434 | |
639cb8ab | 1435 | if (nextstate == SSH_CHANNEL_DYNAMIC) { |
1436 | /* | |
1437 | * do not call the channel_post handler until | |
1438 | * this flag has been reset by a pre-handler. | |
1439 | * otherwise the FD_ISSET calls might overflow | |
1440 | */ | |
1441 | nc->delayed = 1; | |
1442 | } else { | |
0490e609 | 1443 | port_open_helper(nc, rtype); |
639cb8ab | 1444 | } |
7368a6c8 | 1445 | } |
1446 | } | |
8efc0c15 | 1447 | |
7368a6c8 | 1448 | /* |
1449 | * This is the authentication agent socket listening for connections from | |
1450 | * clients. | |
1451 | */ | |
ebb90778 | 1452 | /* ARGSUSED */ |
396c147e | 1453 | static void |
c8e9c167 | 1454 | channel_post_auth_listener(Channel *c, fd_set *readset, fd_set *writeset) |
8efc0c15 | 1455 | { |
719fc62f | 1456 | Channel *nc; |
1457 | int newsock; | |
9fb764ab | 1458 | struct sockaddr_storage addr; |
48e671d5 | 1459 | socklen_t addrlen; |
5260325f | 1460 | |
7368a6c8 | 1461 | if (FD_ISSET(c->sock, readset)) { |
1462 | addrlen = sizeof(addr); | |
9fb764ab | 1463 | newsock = accept(c->sock, (struct sockaddr *)&addr, &addrlen); |
7368a6c8 | 1464 | if (newsock < 0) { |
1465 | error("accept from auth socket: %.100s", strerror(errno)); | |
1466 | return; | |
1467 | } | |
719fc62f | 1468 | nc = channel_new("accepted auth socket", |
fa08c86b | 1469 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
1470 | c->local_window_max, c->local_maxpacket, | |
0d942eff | 1471 | 0, "accepted auth socket", 1); |
fa08c86b | 1472 | if (compat20) { |
1473 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1474 | packet_put_cstring("auth-agent@openssh.com"); | |
719fc62f | 1475 | packet_put_int(nc->self); |
fa08c86b | 1476 | packet_put_int(c->local_window_max); |
1477 | packet_put_int(c->local_maxpacket); | |
1478 | } else { | |
1479 | packet_start(SSH_SMSG_AGENT_OPEN); | |
719fc62f | 1480 | packet_put_int(nc->self); |
fa08c86b | 1481 | } |
7368a6c8 | 1482 | packet_send(); |
1483 | } | |
1484 | } | |
5260325f | 1485 | |
ebb90778 | 1486 | /* ARGSUSED */ |
396c147e | 1487 | static void |
c8e9c167 | 1488 | channel_post_connecting(Channel *c, fd_set *readset, fd_set *writeset) |
97fb6912 | 1489 | { |
e07e21ad | 1490 | int err = 0, sock; |
8ab2cb35 | 1491 | socklen_t sz = sizeof(err); |
d18e0850 | 1492 | |
97fb6912 | 1493 | if (FD_ISSET(c->sock, writeset)) { |
db518d9b | 1494 | if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, &err, &sz) < 0) { |
d18e0850 | 1495 | err = errno; |
1496 | error("getsockopt SO_ERROR failed"); | |
1497 | } | |
1498 | if (err == 0) { | |
e07e21ad | 1499 | debug("channel %d: connected to %s port %d", |
1500 | c->self, c->connect_ctx.host, c->connect_ctx.port); | |
1501 | channel_connect_ctx_free(&c->connect_ctx); | |
d18e0850 | 1502 | c->type = SSH_CHANNEL_OPEN; |
1503 | if (compat20) { | |
1504 | packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1505 | packet_put_int(c->remote_id); | |
1506 | packet_put_int(c->self); | |
1507 | packet_put_int(c->local_window); | |
1508 | packet_put_int(c->local_maxpacket); | |
1509 | } else { | |
1510 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1511 | packet_put_int(c->remote_id); | |
1512 | packet_put_int(c->self); | |
1513 | } | |
97fb6912 | 1514 | } else { |
e07e21ad | 1515 | debug("channel %d: connection failed: %s", |
d18e0850 | 1516 | c->self, strerror(err)); |
e07e21ad | 1517 | /* Try next address, if any */ |
1518 | if ((sock = connect_next(&c->connect_ctx)) > 0) { | |
1519 | close(c->sock); | |
1520 | c->sock = c->rfd = c->wfd = sock; | |
1521 | channel_max_fd = channel_find_maxfd(); | |
1522 | return; | |
1523 | } | |
1524 | /* Exhausted all addresses */ | |
1525 | error("connect_to %.100s port %d: failed.", | |
1526 | c->connect_ctx.host, c->connect_ctx.port); | |
1527 | channel_connect_ctx_free(&c->connect_ctx); | |
d18e0850 | 1528 | if (compat20) { |
1529 | packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); | |
1530 | packet_put_int(c->remote_id); | |
1531 | packet_put_int(SSH2_OPEN_CONNECT_FAILED); | |
1532 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { | |
1533 | packet_put_cstring(strerror(err)); | |
1534 | packet_put_cstring(""); | |
1535 | } | |
97fb6912 | 1536 | } else { |
d18e0850 | 1537 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
1538 | packet_put_int(c->remote_id); | |
97fb6912 | 1539 | } |
d18e0850 | 1540 | chan_mark_dead(c); |
97fb6912 | 1541 | } |
d18e0850 | 1542 | packet_send(); |
97fb6912 | 1543 | } |
1544 | } | |
1545 | ||
ebb90778 | 1546 | /* ARGSUSED */ |
396c147e | 1547 | static int |
c8e9c167 | 1548 | channel_handle_rfd(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1549 | { |
fa1d7d85 | 1550 | char buf[CHAN_RBUF]; |
bd6a1355 | 1551 | int len, force; |
7368a6c8 | 1552 | |
bd6a1355 | 1553 | force = c->isatty && c->detach_close && c->istate != CHAN_INPUT_CLOSED; |
1554 | if (c->rfd != -1 && (force || FD_ISSET(c->rfd, readset))) { | |
ea8c44d9 | 1555 | errno = 0; |
7368a6c8 | 1556 | len = read(c->rfd, buf, sizeof(buf)); |
5a0c8771 | 1557 | if (len < 0 && (errno == EINTR || |
1558 | ((errno == EAGAIN || errno == EWOULDBLOCK) && !force))) | |
0fbe8c74 | 1559 | return 1; |
ea8c44d9 | 1560 | #ifndef PTY_ZEROREAD |
7368a6c8 | 1561 | if (len <= 0) { |
ea8c44d9 | 1562 | #else |
9c04d67d | 1563 | if ((!c->isatty && len <= 0) || |
1564 | (c->isatty && (len < 0 || (len == 0 && errno != 0)))) { | |
ea8c44d9 | 1565 | #endif |
d7ac5f18 | 1566 | debug2("channel %d: read<=0 rfd %d len %d", |
7368a6c8 | 1567 | c->self, c->rfd, len); |
28b9cb4d | 1568 | if (c->type != SSH_CHANNEL_OPEN) { |
d7ac5f18 | 1569 | debug2("channel %d: not open", c->self); |
719fc62f | 1570 | chan_mark_dead(c); |
0490e609 | 1571 | return -1; |
28b9cb4d | 1572 | } else if (compat13) { |
9c50edcf | 1573 | buffer_clear(&c->output); |
7368a6c8 | 1574 | c->type = SSH_CHANNEL_INPUT_DRAINING; |
d7ac5f18 | 1575 | debug2("channel %d: input draining.", c->self); |
7368a6c8 | 1576 | } else { |
1577 | chan_read_failed(c); | |
5260325f | 1578 | } |
7368a6c8 | 1579 | return -1; |
1580 | } | |
6aacefa7 | 1581 | if (c->input_filter != NULL) { |
2e73a022 | 1582 | if (c->input_filter(c, buf, len) == -1) { |
d7ac5f18 | 1583 | debug2("channel %d: filter stops", c->self); |
2e73a022 | 1584 | chan_read_failed(c); |
1585 | } | |
d20f3c9e | 1586 | } else if (c->datagram) { |
1587 | buffer_put_string(&c->input, buf, len); | |
2e73a022 | 1588 | } else { |
1589 | buffer_append(&c->input, buf, len); | |
1590 | } | |
7368a6c8 | 1591 | } |
1592 | return 1; | |
1593 | } | |
a7137f6b | 1594 | |
ebb90778 | 1595 | /* ARGSUSED */ |
396c147e | 1596 | static int |
c8e9c167 | 1597 | channel_handle_wfd(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1598 | { |
95ce5599 | 1599 | struct termios tio; |
c1c6a032 | 1600 | u_char *data = NULL, *buf; |
780a9951 | 1601 | u_int dlen; |
7368a6c8 | 1602 | int len; |
1603 | ||
1604 | /* Send buffered output data to the socket. */ | |
6fd8622b | 1605 | if (c->wfd != -1 && |
7368a6c8 | 1606 | FD_ISSET(c->wfd, writeset) && |
1607 | buffer_len(&c->output) > 0) { | |
c1c6a032 | 1608 | if (c->output_filter != NULL) { |
1609 | if ((buf = c->output_filter(c, &data, &dlen)) == NULL) { | |
1610 | debug2("channel %d: filter stops", c->self); | |
d7b37427 | 1611 | if (c->type != SSH_CHANNEL_OPEN) |
1612 | chan_mark_dead(c); | |
1613 | else | |
1614 | chan_write_failed(c); | |
1615 | return -1; | |
c1c6a032 | 1616 | } |
1617 | } else if (c->datagram) { | |
1618 | buf = data = buffer_get_string(&c->output, &dlen); | |
1619 | } else { | |
1620 | buf = data = buffer_ptr(&c->output); | |
1621 | dlen = buffer_len(&c->output); | |
1622 | } | |
1623 | ||
d20f3c9e | 1624 | if (c->datagram) { |
d20f3c9e | 1625 | /* ignore truncated writes, datagrams might get lost */ |
1626 | c->local_consumed += dlen + 4; | |
c1c6a032 | 1627 | len = write(c->wfd, buf, dlen); |
d20f3c9e | 1628 | xfree(data); |
5a0c8771 | 1629 | if (len < 0 && (errno == EINTR || errno == EAGAIN || |
1630 | errno == EWOULDBLOCK)) | |
d20f3c9e | 1631 | return 1; |
1632 | if (len <= 0) { | |
1633 | if (c->type != SSH_CHANNEL_OPEN) | |
1634 | chan_mark_dead(c); | |
1635 | else | |
1636 | chan_write_failed(c); | |
1637 | return -1; | |
1638 | } | |
1639 | return 1; | |
1640 | } | |
64c0ce80 | 1641 | #ifdef _AIX |
aff51935 | 1642 | /* XXX: Later AIX versions can't push as much data to tty */ |
7fbb4189 | 1643 | if (compat20 && c->wfd_isatty) |
1644 | dlen = MIN(dlen, 8*1024); | |
64c0ce80 | 1645 | #endif |
c1c6a032 | 1646 | |
1647 | len = write(c->wfd, buf, dlen); | |
5a0c8771 | 1648 | if (len < 0 && |
1649 | (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK)) | |
0fbe8c74 | 1650 | return 1; |
7368a6c8 | 1651 | if (len <= 0) { |
28b9cb4d | 1652 | if (c->type != SSH_CHANNEL_OPEN) { |
d7ac5f18 | 1653 | debug2("channel %d: not open", c->self); |
719fc62f | 1654 | chan_mark_dead(c); |
28b9cb4d | 1655 | return -1; |
1656 | } else if (compat13) { | |
9c50edcf | 1657 | buffer_clear(&c->output); |
d7ac5f18 | 1658 | debug2("channel %d: input draining.", c->self); |
7368a6c8 | 1659 | c->type = SSH_CHANNEL_INPUT_DRAINING; |
1660 | } else { | |
1661 | chan_write_failed(c); | |
5260325f | 1662 | } |
7368a6c8 | 1663 | return -1; |
1664 | } | |
5e934f78 | 1665 | #ifndef BROKEN_TCGETATTR_ICANON |
c1c6a032 | 1666 | if (compat20 && c->isatty && dlen >= 1 && buf[0] != '\r') { |
0ae4fe1d | 1667 | if (tcgetattr(c->wfd, &tio) == 0 && |
1668 | !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) { | |
1669 | /* | |
1670 | * Simulate echo to reduce the impact of | |
355724fc | 1671 | * traffic analysis. We need to match the |
95ce5599 | 1672 | * size of a SSH2_MSG_CHANNEL_DATA message |
c1c6a032 | 1673 | * (4 byte channel id + buf) |
0ae4fe1d | 1674 | */ |
95ce5599 | 1675 | packet_send_ignore(4 + len); |
0ae4fe1d | 1676 | packet_send(); |
0ae4fe1d | 1677 | } |
1678 | } | |
5e934f78 | 1679 | #endif |
7368a6c8 | 1680 | buffer_consume(&c->output, len); |
7e7327a1 | 1681 | if (compat20 && len > 0) { |
1682 | c->local_consumed += len; | |
1683 | } | |
1684 | } | |
1685 | return 1; | |
1686 | } | |
a7137f6b | 1687 | |
396c147e | 1688 | static int |
c8e9c167 | 1689 | channel_handle_efd(Channel *c, fd_set *readset, fd_set *writeset) |
7e7327a1 | 1690 | { |
fa1d7d85 | 1691 | char buf[CHAN_RBUF]; |
7e7327a1 | 1692 | int len; |
1693 | ||
8ce64345 | 1694 | /** XXX handle drain efd, too */ |
7e7327a1 | 1695 | if (c->efd != -1) { |
1696 | if (c->extended_usage == CHAN_EXTENDED_WRITE && | |
1697 | FD_ISSET(c->efd, writeset) && | |
1698 | buffer_len(&c->extended) > 0) { | |
1699 | len = write(c->efd, buffer_ptr(&c->extended), | |
1700 | buffer_len(&c->extended)); | |
de273eef | 1701 | debug2("channel %d: written %d to efd %d", |
7e7327a1 | 1702 | c->self, len, c->efd); |
5a0c8771 | 1703 | if (len < 0 && (errno == EINTR || errno == EAGAIN || |
1704 | errno == EWOULDBLOCK)) | |
ee55dacf | 1705 | return 1; |
1706 | if (len <= 0) { | |
1707 | debug2("channel %d: closing write-efd %d", | |
1708 | c->self, c->efd); | |
489aa2e9 | 1709 | channel_close_fd(&c->efd); |
ee55dacf | 1710 | } else { |
7e7327a1 | 1711 | buffer_consume(&c->extended, len); |
1712 | c->local_consumed += len; | |
1713 | } | |
1714 | } else if (c->extended_usage == CHAN_EXTENDED_READ && | |
34640ce6 | 1715 | (c->detach_close || FD_ISSET(c->efd, readset))) { |
7e7327a1 | 1716 | len = read(c->efd, buf, sizeof(buf)); |
de273eef | 1717 | debug2("channel %d: read %d from efd %d", |
184eed6a | 1718 | c->self, len, c->efd); |
5a0c8771 | 1719 | if (len < 0 && (errno == EINTR || ((errno == EAGAIN || |
1720 | errno == EWOULDBLOCK) && !c->detach_close))) | |
ee55dacf | 1721 | return 1; |
1722 | if (len <= 0) { | |
1723 | debug2("channel %d: closing read-efd %d", | |
8ce64345 | 1724 | c->self, c->efd); |
489aa2e9 | 1725 | channel_close_fd(&c->efd); |
ee55dacf | 1726 | } else { |
7e7327a1 | 1727 | buffer_append(&c->extended, buf, len); |
ee55dacf | 1728 | } |
7e7327a1 | 1729 | } |
1730 | } | |
1731 | return 1; | |
1732 | } | |
a7137f6b | 1733 | |
ebb90778 | 1734 | /* ARGSUSED */ |
396c147e | 1735 | static int |
c8e9c167 | 1736 | channel_handle_ctl(Channel *c, fd_set *readset, fd_set *writeset) |
5e96b616 | 1737 | { |
1738 | char buf[16]; | |
1739 | int len; | |
1740 | ||
1741 | /* Monitor control fd to detect if the slave client exits */ | |
1742 | if (c->ctl_fd != -1 && FD_ISSET(c->ctl_fd, readset)) { | |
1743 | len = read(c->ctl_fd, buf, sizeof(buf)); | |
5a0c8771 | 1744 | if (len < 0 && |
1745 | (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK)) | |
5e96b616 | 1746 | return 1; |
1747 | if (len <= 0) { | |
1748 | debug2("channel %d: ctl read<=0", c->self); | |
1749 | if (c->type != SSH_CHANNEL_OPEN) { | |
1750 | debug2("channel %d: not open", c->self); | |
1751 | chan_mark_dead(c); | |
1752 | return -1; | |
1753 | } else { | |
1754 | chan_read_failed(c); | |
1755 | chan_write_failed(c); | |
1756 | } | |
1757 | return -1; | |
1758 | } else | |
1759 | fatal("%s: unexpected data on ctl fd", __func__); | |
1760 | } | |
1761 | return 1; | |
1762 | } | |
a7137f6b | 1763 | |
5e96b616 | 1764 | static int |
ee55dacf | 1765 | channel_check_window(Channel *c) |
7e7327a1 | 1766 | { |
28b9cb4d | 1767 | if (c->type == SSH_CHANNEL_OPEN && |
1768 | !(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) && | |
d9245683 | 1769 | ((c->local_window_max - c->local_window > |
68a73f53 | 1770 | c->local_maxpacket*3) || |
1771 | c->local_window < c->local_window_max/2) && | |
7e7327a1 | 1772 | c->local_consumed > 0) { |
1773 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); | |
1774 | packet_put_int(c->remote_id); | |
1775 | packet_put_int(c->local_consumed); | |
1776 | packet_send(); | |
de273eef | 1777 | debug2("channel %d: window %d sent adjust %d", |
7e7327a1 | 1778 | c->self, c->local_window, |
1779 | c->local_consumed); | |
1780 | c->local_window += c->local_consumed; | |
1781 | c->local_consumed = 0; | |
7368a6c8 | 1782 | } |
1783 | return 1; | |
1784 | } | |
5260325f | 1785 | |
396c147e | 1786 | static void |
c8e9c167 | 1787 | channel_post_open(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1788 | { |
639cb8ab | 1789 | if (c->delayed) |
1790 | return; | |
7368a6c8 | 1791 | channel_handle_rfd(c, readset, writeset); |
1792 | channel_handle_wfd(c, readset, writeset); | |
0c0738d5 | 1793 | if (!compat20) |
639cb8ab | 1794 | return; |
7e7327a1 | 1795 | channel_handle_efd(c, readset, writeset); |
5e96b616 | 1796 | channel_handle_ctl(c, readset, writeset); |
ee55dacf | 1797 | channel_check_window(c); |
7e7327a1 | 1798 | } |
1799 | ||
ebb90778 | 1800 | /* ARGSUSED */ |
396c147e | 1801 | static void |
c8e9c167 | 1802 | channel_post_output_drain_13(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1803 | { |
1804 | int len; | |
e1feb9bf | 1805 | |
7368a6c8 | 1806 | /* Send buffered output data to the socket. */ |
1807 | if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) { | |
1808 | len = write(c->sock, buffer_ptr(&c->output), | |
1809 | buffer_len(&c->output)); | |
1810 | if (len <= 0) | |
9c50edcf | 1811 | buffer_clear(&c->output); |
7368a6c8 | 1812 | else |
1813 | buffer_consume(&c->output, len); | |
1814 | } | |
1815 | } | |
5260325f | 1816 | |
396c147e | 1817 | static void |
7e7327a1 | 1818 | channel_handler_init_20(void) |
1819 | { | |
0c0738d5 | 1820 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open; |
0b242b12 | 1821 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
7e7327a1 | 1822 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; |
fa08c86b | 1823 | channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener; |
0b242b12 | 1824 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
fa08c86b | 1825 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; |
97fb6912 | 1826 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1827 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7e7327a1 | 1828 | |
0c0738d5 | 1829 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
7e7327a1 | 1830 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; |
fa08c86b | 1831 | channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener; |
0b242b12 | 1832 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
fa08c86b | 1833 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; |
97fb6912 | 1834 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 1835 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
7e7327a1 | 1836 | } |
1837 | ||
396c147e | 1838 | static void |
7368a6c8 | 1839 | channel_handler_init_13(void) |
1840 | { | |
1841 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13; | |
1842 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_13; | |
1843 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; | |
1844 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; | |
1845 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; | |
1846 | channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining; | |
1847 | channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining; | |
97fb6912 | 1848 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1849 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7368a6c8 | 1850 | |
0c0738d5 | 1851 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
7368a6c8 | 1852 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
1853 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; | |
1854 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; | |
1855 | channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13; | |
97fb6912 | 1856 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 1857 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
7368a6c8 | 1858 | } |
5260325f | 1859 | |
396c147e | 1860 | static void |
7368a6c8 | 1861 | channel_handler_init_15(void) |
1862 | { | |
0c0738d5 | 1863 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open; |
0b242b12 | 1864 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
7368a6c8 | 1865 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
1866 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; | |
1867 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; | |
97fb6912 | 1868 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1869 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7368a6c8 | 1870 | |
1871 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; | |
1872 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; | |
1873 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; | |
0c0738d5 | 1874 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
97fb6912 | 1875 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 1876 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
7368a6c8 | 1877 | } |
1878 | ||
396c147e | 1879 | static void |
7368a6c8 | 1880 | channel_handler_init(void) |
1881 | { | |
1882 | int i; | |
e1feb9bf | 1883 | |
184eed6a | 1884 | for (i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) { |
7368a6c8 | 1885 | channel_pre[i] = NULL; |
1886 | channel_post[i] = NULL; | |
1887 | } | |
7e7327a1 | 1888 | if (compat20) |
1889 | channel_handler_init_20(); | |
1890 | else if (compat13) | |
7368a6c8 | 1891 | channel_handler_init_13(); |
1892 | else | |
1893 | channel_handler_init_15(); | |
1894 | } | |
1895 | ||
418e724c | 1896 | /* gc dead channels */ |
1897 | static void | |
1898 | channel_garbage_collect(Channel *c) | |
1899 | { | |
1900 | if (c == NULL) | |
1901 | return; | |
1902 | if (c->detach_user != NULL) { | |
8cd0437d | 1903 | if (!chan_is_dead(c, c->detach_close)) |
418e724c | 1904 | return; |
d7ac5f18 | 1905 | debug2("channel %d: gc: notify user", c->self); |
418e724c | 1906 | c->detach_user(c->self, NULL); |
1907 | /* if we still have a callback */ | |
1908 | if (c->detach_user != NULL) | |
1909 | return; | |
d7ac5f18 | 1910 | debug2("channel %d: gc: user detached", c->self); |
418e724c | 1911 | } |
1912 | if (!chan_is_dead(c, 1)) | |
1913 | return; | |
d7ac5f18 | 1914 | debug2("channel %d: garbage collecting", c->self); |
418e724c | 1915 | channel_free(c); |
1916 | } | |
1917 | ||
396c147e | 1918 | static void |
c8e9c167 | 1919 | channel_handler(chan_fn *ftab[], fd_set *readset, fd_set *writeset) |
7368a6c8 | 1920 | { |
1921 | static int did_init = 0; | |
9a995072 | 1922 | u_int i; |
7368a6c8 | 1923 | Channel *c; |
1924 | ||
1925 | if (!did_init) { | |
1926 | channel_handler_init(); | |
1927 | did_init = 1; | |
1928 | } | |
1929 | for (i = 0; i < channels_alloc; i++) { | |
719fc62f | 1930 | c = channels[i]; |
1931 | if (c == NULL) | |
5260325f | 1932 | continue; |
6fd8622b | 1933 | if (ftab[c->type] != NULL) |
1934 | (*ftab[c->type])(c, readset, writeset); | |
418e724c | 1935 | channel_garbage_collect(c); |
8efc0c15 | 1936 | } |
8efc0c15 | 1937 | } |
1938 | ||
8e7895b8 | 1939 | /* |
1940 | * Allocate/update select bitmasks and add any bits relevant to channels in | |
1941 | * select bitmasks. | |
1942 | */ | |
6ae2364d | 1943 | void |
c422989b | 1944 | channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp, |
9a995072 | 1945 | u_int *nallocp, int rekeying) |
7368a6c8 | 1946 | { |
c5d10563 | 1947 | u_int n, sz, nfdset; |
39929cdb | 1948 | |
1949 | n = MAX(*maxfdp, channel_max_fd); | |
1950 | ||
c5d10563 | 1951 | nfdset = howmany(n+1, NFDBITS); |
1952 | /* Explicitly test here, because xrealloc isn't always called */ | |
1953 | if (nfdset && SIZE_T_MAX / nfdset < sizeof(fd_mask)) | |
1954 | fatal("channel_prepare_select: max_fd (%d) is too large", n); | |
1955 | sz = nfdset * sizeof(fd_mask); | |
1956 | ||
489aa2e9 | 1957 | /* perhaps check sz < nalloc/2 and shrink? */ |
1958 | if (*readsetp == NULL || sz > *nallocp) { | |
c5d10563 | 1959 | *readsetp = xrealloc(*readsetp, nfdset, sizeof(fd_mask)); |
1960 | *writesetp = xrealloc(*writesetp, nfdset, sizeof(fd_mask)); | |
489aa2e9 | 1961 | *nallocp = sz; |
39929cdb | 1962 | } |
489aa2e9 | 1963 | *maxfdp = n; |
39929cdb | 1964 | memset(*readsetp, 0, sz); |
1965 | memset(*writesetp, 0, sz); | |
1966 | ||
c422989b | 1967 | if (!rekeying) |
1968 | channel_handler(channel_pre, *readsetp, *writesetp); | |
7368a6c8 | 1969 | } |
1970 | ||
8e7895b8 | 1971 | /* |
1972 | * After select, perform any appropriate operations for channels which have | |
1973 | * events pending. | |
1974 | */ | |
6ae2364d | 1975 | void |
c8e9c167 | 1976 | channel_after_select(fd_set *readset, fd_set *writeset) |
7368a6c8 | 1977 | { |
1978 | channel_handler(channel_post, readset, writeset); | |
1979 | } | |
1980 | ||
8e7895b8 | 1981 | |
39929cdb | 1982 | /* If there is data to send to the connection, enqueue some of it now. */ |
6ae2364d | 1983 | void |
d5bb9418 | 1984 | channel_output_poll(void) |
8efc0c15 | 1985 | { |
7368a6c8 | 1986 | Channel *c; |
9a995072 | 1987 | u_int i, len; |
5260325f | 1988 | |
1989 | for (i = 0; i < channels_alloc; i++) { | |
719fc62f | 1990 | c = channels[i]; |
1991 | if (c == NULL) | |
1992 | continue; | |
48e671d5 | 1993 | |
8e7895b8 | 1994 | /* |
1995 | * We are only interested in channels that can have buffered | |
1996 | * incoming data. | |
1997 | */ | |
48e671d5 | 1998 | if (compat13) { |
7368a6c8 | 1999 | if (c->type != SSH_CHANNEL_OPEN && |
2000 | c->type != SSH_CHANNEL_INPUT_DRAINING) | |
48e671d5 | 2001 | continue; |
2002 | } else { | |
7368a6c8 | 2003 | if (c->type != SSH_CHANNEL_OPEN) |
48e671d5 | 2004 | continue; |
48e671d5 | 2005 | } |
e78a59f5 | 2006 | if (compat20 && |
2007 | (c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) { | |
ee55dacf | 2008 | /* XXX is this true? */ |
418e724c | 2009 | debug3("channel %d: will not send data after close", c->self); |
7e7327a1 | 2010 | continue; |
2011 | } | |
5260325f | 2012 | |
2013 | /* Get the amount of buffered data for this channel. */ | |
ee55dacf | 2014 | if ((c->istate == CHAN_INPUT_OPEN || |
2015 | c->istate == CHAN_INPUT_WAIT_DRAIN) && | |
2016 | (len = buffer_len(&c->input)) > 0) { | |
d20f3c9e | 2017 | if (c->datagram) { |
2018 | if (len > 0) { | |
2019 | u_char *data; | |
2020 | u_int dlen; | |
2021 | ||
2022 | data = buffer_get_string(&c->input, | |
2023 | &dlen); | |
2024 | packet_start(SSH2_MSG_CHANNEL_DATA); | |
2025 | packet_put_int(c->remote_id); | |
2026 | packet_put_string(data, dlen); | |
2027 | packet_send(); | |
2028 | c->remote_window -= dlen + 4; | |
2029 | xfree(data); | |
2030 | } | |
2031 | continue; | |
2032 | } | |
8e7895b8 | 2033 | /* |
2034 | * Send some data for the other side over the secure | |
2035 | * connection. | |
2036 | */ | |
7e7327a1 | 2037 | if (compat20) { |
2038 | if (len > c->remote_window) | |
2039 | len = c->remote_window; | |
2040 | if (len > c->remote_maxpacket) | |
2041 | len = c->remote_maxpacket; | |
5260325f | 2042 | } else { |
7e7327a1 | 2043 | if (packet_is_interactive()) { |
2044 | if (len > 1024) | |
2045 | len = 512; | |
2046 | } else { | |
2047 | /* Keep the packets at reasonable size. */ | |
2048 | if (len > packet_get_maxsize()/2) | |
2049 | len = packet_get_maxsize()/2; | |
2050 | } | |
5260325f | 2051 | } |
7368a6c8 | 2052 | if (len > 0) { |
7e7327a1 | 2053 | packet_start(compat20 ? |
2054 | SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA); | |
7368a6c8 | 2055 | packet_put_int(c->remote_id); |
2056 | packet_put_string(buffer_ptr(&c->input), len); | |
2057 | packet_send(); | |
2058 | buffer_consume(&c->input, len); | |
2059 | c->remote_window -= len; | |
7368a6c8 | 2060 | } |
2061 | } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) { | |
5260325f | 2062 | if (compat13) |
2063 | fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3"); | |
aa3378df | 2064 | /* |
2065 | * input-buffer is empty and read-socket shutdown: | |
d2296ed7 | 2066 | * tell peer, that we will not send more data: send IEOF. |
2067 | * hack for extended data: delay EOF if EFD still in use. | |
aa3378df | 2068 | */ |
d2296ed7 | 2069 | if (CHANNEL_EFD_INPUT_ACTIVE(c)) |
4e2e5cfd | 2070 | debug2("channel %d: ibuf_empty delayed efd %d/(%d)", |
2071 | c->self, c->efd, buffer_len(&c->extended)); | |
d2296ed7 | 2072 | else |
2073 | chan_ibuf_empty(c); | |
5260325f | 2074 | } |
7e7327a1 | 2075 | /* Send extended data, i.e. stderr */ |
2076 | if (compat20 && | |
d2296ed7 | 2077 | !(c->flags & CHAN_EOF_SENT) && |
7e7327a1 | 2078 | c->remote_window > 0 && |
2079 | (len = buffer_len(&c->extended)) > 0 && | |
2080 | c->extended_usage == CHAN_EXTENDED_READ) { | |
f91d9a89 | 2081 | debug2("channel %d: rwin %u elen %u euse %d", |
ee55dacf | 2082 | c->self, c->remote_window, buffer_len(&c->extended), |
2083 | c->extended_usage); | |
7e7327a1 | 2084 | if (len > c->remote_window) |
2085 | len = c->remote_window; | |
2086 | if (len > c->remote_maxpacket) | |
2087 | len = c->remote_maxpacket; | |
2088 | packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA); | |
2089 | packet_put_int(c->remote_id); | |
2090 | packet_put_int(SSH2_EXTENDED_DATA_STDERR); | |
2091 | packet_put_string(buffer_ptr(&c->extended), len); | |
2092 | packet_send(); | |
2093 | buffer_consume(&c->extended, len); | |
2094 | c->remote_window -= len; | |
ee55dacf | 2095 | debug2("channel %d: sent ext data %d", c->self, len); |
7e7327a1 | 2096 | } |
8efc0c15 | 2097 | } |
8efc0c15 | 2098 | } |
2099 | ||
8e7895b8 | 2100 | |
2101 | /* -- protocol input */ | |
04aa9e67 | 2102 | |
2103 | /* ARGSUSED */ | |
6ae2364d | 2104 | void |
7819b5c3 | 2105 | channel_input_data(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2106 | { |
48e671d5 | 2107 | int id; |
5260325f | 2108 | char *data; |
1e3b8b07 | 2109 | u_int data_len; |
7368a6c8 | 2110 | Channel *c; |
5260325f | 2111 | |
2112 | /* Get the channel number and verify it. */ | |
48e671d5 | 2113 | id = packet_get_int(); |
7368a6c8 | 2114 | c = channel_lookup(id); |
2115 | if (c == NULL) | |
48e671d5 | 2116 | packet_disconnect("Received data for nonexistent channel %d.", id); |
5260325f | 2117 | |
2118 | /* Ignore any data for non-open channels (might happen on close) */ | |
7368a6c8 | 2119 | if (c->type != SSH_CHANNEL_OPEN && |
2120 | c->type != SSH_CHANNEL_X11_OPEN) | |
48e671d5 | 2121 | return; |
2122 | ||
5260325f | 2123 | /* Get the data. */ |
17f02f0a | 2124 | data = packet_get_string_ptr(&data_len); |
7368a6c8 | 2125 | |
7741e239 | 2126 | /* |
2127 | * Ignore data for protocol > 1.3 if output end is no longer open. | |
2128 | * For protocol 2 the sending side is reducing its window as it sends | |
2129 | * data, so we must 'fake' consumption of the data in order to ensure | |
2130 | * that window updates are sent back. Otherwise the connection might | |
2131 | * deadlock. | |
2132 | */ | |
2133 | if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN) { | |
2134 | if (compat20) { | |
2135 | c->local_window -= data_len; | |
2136 | c->local_consumed += data_len; | |
2137 | } | |
7741e239 | 2138 | return; |
2139 | } | |
2140 | ||
6aacefa7 | 2141 | if (compat20) { |
7e7327a1 | 2142 | if (data_len > c->local_maxpacket) { |
bbe88b6d | 2143 | logit("channel %d: rcvd big packet %d, maxpack %d", |
7e7327a1 | 2144 | c->self, data_len, c->local_maxpacket); |
2145 | } | |
2146 | if (data_len > c->local_window) { | |
bbe88b6d | 2147 | logit("channel %d: rcvd too much data %d, win %d", |
7e7327a1 | 2148 | c->self, data_len, c->local_window); |
7e7327a1 | 2149 | return; |
2150 | } | |
2151 | c->local_window -= data_len; | |
7e7327a1 | 2152 | } |
d20f3c9e | 2153 | if (c->datagram) |
2154 | buffer_put_string(&c->output, data, data_len); | |
2155 | else | |
2156 | buffer_append(&c->output, data, data_len); | |
17f02f0a | 2157 | packet_check_eom(); |
8efc0c15 | 2158 | } |
8e7895b8 | 2159 | |
04aa9e67 | 2160 | /* ARGSUSED */ |
6ae2364d | 2161 | void |
7819b5c3 | 2162 | channel_input_extended_data(int type, u_int32_t seq, void *ctxt) |
7e7327a1 | 2163 | { |
2164 | int id; | |
7e7327a1 | 2165 | char *data; |
a594fa74 | 2166 | u_int data_len, tcode; |
7e7327a1 | 2167 | Channel *c; |
2168 | ||
2169 | /* Get the channel number and verify it. */ | |
2170 | id = packet_get_int(); | |
2171 | c = channel_lookup(id); | |
2172 | ||
2173 | if (c == NULL) | |
2174 | packet_disconnect("Received extended_data for bad channel %d.", id); | |
2175 | if (c->type != SSH_CHANNEL_OPEN) { | |
bbe88b6d | 2176 | logit("channel %d: ext data for non open", id); |
7e7327a1 | 2177 | return; |
2178 | } | |
d2296ed7 | 2179 | if (c->flags & CHAN_EOF_RCVD) { |
2180 | if (datafellows & SSH_BUG_EXTEOF) | |
2181 | debug("channel %d: accepting ext data after eof", id); | |
2182 | else | |
2183 | packet_disconnect("Received extended_data after EOF " | |
2184 | "on channel %d.", id); | |
2185 | } | |
7e7327a1 | 2186 | tcode = packet_get_int(); |
2187 | if (c->efd == -1 || | |
2188 | c->extended_usage != CHAN_EXTENDED_WRITE || | |
2189 | tcode != SSH2_EXTENDED_DATA_STDERR) { | |
bbe88b6d | 2190 | logit("channel %d: bad ext data", c->self); |
7e7327a1 | 2191 | return; |
2192 | } | |
2193 | data = packet_get_string(&data_len); | |
95500969 | 2194 | packet_check_eom(); |
7e7327a1 | 2195 | if (data_len > c->local_window) { |
bbe88b6d | 2196 | logit("channel %d: rcvd too much extended_data %d, win %d", |
7e7327a1 | 2197 | c->self, data_len, c->local_window); |
2198 | xfree(data); | |
2199 | return; | |
2200 | } | |
de273eef | 2201 | debug2("channel %d: rcvd ext data %d", c->self, data_len); |
7e7327a1 | 2202 | c->local_window -= data_len; |
2203 | buffer_append(&c->extended, data, data_len); | |
2204 | xfree(data); | |
2205 | } | |
2206 | ||
04aa9e67 | 2207 | /* ARGSUSED */ |
6ae2364d | 2208 | void |
7819b5c3 | 2209 | channel_input_ieof(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 2210 | { |
2211 | int id; | |
2212 | Channel *c; | |
2213 | ||
7368a6c8 | 2214 | id = packet_get_int(); |
95500969 | 2215 | packet_check_eom(); |
7368a6c8 | 2216 | c = channel_lookup(id); |
2217 | if (c == NULL) | |
2218 | packet_disconnect("Received ieof for nonexistent channel %d.", id); | |
2219 | chan_rcvd_ieof(c); | |
a5f82435 | 2220 | |
2221 | /* XXX force input close */ | |
8341f420 | 2222 | if (c->force_drain && c->istate == CHAN_INPUT_OPEN) { |
a5f82435 | 2223 | debug("channel %d: FORCE input drain", c->self); |
2224 | c->istate = CHAN_INPUT_WAIT_DRAIN; | |
32e7d71f | 2225 | if (buffer_len(&c->input) == 0) |
2226 | chan_ibuf_empty(c); | |
a5f82435 | 2227 | } |
2228 | ||
7368a6c8 | 2229 | } |
8efc0c15 | 2230 | |
04aa9e67 | 2231 | /* ARGSUSED */ |
6ae2364d | 2232 | void |
7819b5c3 | 2233 | channel_input_close(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2234 | { |
7368a6c8 | 2235 | int id; |
2236 | Channel *c; | |
5260325f | 2237 | |
7368a6c8 | 2238 | id = packet_get_int(); |
95500969 | 2239 | packet_check_eom(); |
7368a6c8 | 2240 | c = channel_lookup(id); |
2241 | if (c == NULL) | |
2242 | packet_disconnect("Received close for nonexistent channel %d.", id); | |
aa3378df | 2243 | |
2244 | /* | |
2245 | * Send a confirmation that we have closed the channel and no more | |
2246 | * data is coming for it. | |
2247 | */ | |
5260325f | 2248 | packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION); |
7368a6c8 | 2249 | packet_put_int(c->remote_id); |
5260325f | 2250 | packet_send(); |
2251 | ||
aa3378df | 2252 | /* |
2253 | * If the channel is in closed state, we have sent a close request, | |
2254 | * and the other side will eventually respond with a confirmation. | |
2255 | * Thus, we cannot free the channel here, because then there would be | |
2256 | * no-one to receive the confirmation. The channel gets freed when | |
2257 | * the confirmation arrives. | |
2258 | */ | |
7368a6c8 | 2259 | if (c->type != SSH_CHANNEL_CLOSED) { |
aa3378df | 2260 | /* |
2261 | * Not a closed channel - mark it as draining, which will | |
2262 | * cause it to be freed later. | |
2263 | */ | |
9c50edcf | 2264 | buffer_clear(&c->input); |
7368a6c8 | 2265 | c->type = SSH_CHANNEL_OUTPUT_DRAINING; |
5260325f | 2266 | } |
8efc0c15 | 2267 | } |
2268 | ||
7368a6c8 | 2269 | /* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */ |
04aa9e67 | 2270 | /* ARGSUSED */ |
6ae2364d | 2271 | void |
7819b5c3 | 2272 | channel_input_oclose(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2273 | { |
7368a6c8 | 2274 | int id = packet_get_int(); |
2275 | Channel *c = channel_lookup(id); | |
a8a21a53 | 2276 | |
95500969 | 2277 | packet_check_eom(); |
7368a6c8 | 2278 | if (c == NULL) |
2279 | packet_disconnect("Received oclose for nonexistent channel %d.", id); | |
2280 | chan_rcvd_oclose(c); | |
8efc0c15 | 2281 | } |
2282 | ||
04aa9e67 | 2283 | /* ARGSUSED */ |
6ae2364d | 2284 | void |
7819b5c3 | 2285 | channel_input_close_confirmation(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 2286 | { |
2287 | int id = packet_get_int(); | |
2288 | Channel *c = channel_lookup(id); | |
2289 | ||
95500969 | 2290 | packet_check_eom(); |
7368a6c8 | 2291 | if (c == NULL) |
2292 | packet_disconnect("Received close confirmation for " | |
2293 | "out-of-range channel %d.", id); | |
2294 | if (c->type != SSH_CHANNEL_CLOSED) | |
2295 | packet_disconnect("Received close confirmation for " | |
2296 | "non-closed channel %d (type %d).", id, c->type); | |
719fc62f | 2297 | channel_free(c); |
7368a6c8 | 2298 | } |
8efc0c15 | 2299 | |
04aa9e67 | 2300 | /* ARGSUSED */ |
6ae2364d | 2301 | void |
7819b5c3 | 2302 | channel_input_open_confirmation(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2303 | { |
7368a6c8 | 2304 | int id, remote_id; |
2305 | Channel *c; | |
5260325f | 2306 | |
7368a6c8 | 2307 | id = packet_get_int(); |
2308 | c = channel_lookup(id); | |
5260325f | 2309 | |
7368a6c8 | 2310 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) |
2311 | packet_disconnect("Received open confirmation for " | |
2312 | "non-opening channel %d.", id); | |
2313 | remote_id = packet_get_int(); | |
aa3378df | 2314 | /* Record the remote channel number and mark that the channel is now open. */ |
7368a6c8 | 2315 | c->remote_id = remote_id; |
2316 | c->type = SSH_CHANNEL_OPEN; | |
7e7327a1 | 2317 | |
2318 | if (compat20) { | |
2319 | c->remote_window = packet_get_int(); | |
2320 | c->remote_maxpacket = packet_get_int(); | |
3593bdc0 | 2321 | if (c->open_confirm) { |
de273eef | 2322 | debug2("callback start"); |
3593bdc0 | 2323 | c->open_confirm(c->self, c->open_confirm_ctx); |
de273eef | 2324 | debug2("callback done"); |
7e7327a1 | 2325 | } |
d7ac5f18 | 2326 | debug2("channel %d: open confirm rwindow %u rmax %u", c->self, |
7e7327a1 | 2327 | c->remote_window, c->remote_maxpacket); |
2328 | } | |
95500969 | 2329 | packet_check_eom(); |
8efc0c15 | 2330 | } |
2331 | ||
396c147e | 2332 | static char * |
d18e0850 | 2333 | reason2txt(int reason) |
2334 | { | |
6aacefa7 | 2335 | switch (reason) { |
d18e0850 | 2336 | case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED: |
2337 | return "administratively prohibited"; | |
2338 | case SSH2_OPEN_CONNECT_FAILED: | |
2339 | return "connect failed"; | |
2340 | case SSH2_OPEN_UNKNOWN_CHANNEL_TYPE: | |
2341 | return "unknown channel type"; | |
2342 | case SSH2_OPEN_RESOURCE_SHORTAGE: | |
2343 | return "resource shortage"; | |
2344 | } | |
7e8c18e9 | 2345 | return "unknown reason"; |
d18e0850 | 2346 | } |
2347 | ||
04aa9e67 | 2348 | /* ARGSUSED */ |
6ae2364d | 2349 | void |
7819b5c3 | 2350 | channel_input_open_failure(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2351 | { |
02a024dd | 2352 | int id, reason; |
2353 | char *msg = NULL, *lang = NULL; | |
7368a6c8 | 2354 | Channel *c; |
5260325f | 2355 | |
7368a6c8 | 2356 | id = packet_get_int(); |
2357 | c = channel_lookup(id); | |
2358 | ||
2359 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) | |
2360 | packet_disconnect("Received open failure for " | |
2361 | "non-opening channel %d.", id); | |
7e7327a1 | 2362 | if (compat20) { |
02a024dd | 2363 | reason = packet_get_int(); |
fbe90f7b | 2364 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { |
02a024dd | 2365 | msg = packet_get_string(NULL); |
2366 | lang = packet_get_string(NULL); | |
2367 | } | |
bbe88b6d | 2368 | logit("channel %d: open failed: %s%s%s", id, |
d18e0850 | 2369 | reason2txt(reason), msg ? ": ": "", msg ? msg : ""); |
02a024dd | 2370 | if (msg != NULL) |
2371 | xfree(msg); | |
2372 | if (lang != NULL) | |
2373 | xfree(lang); | |
7e7327a1 | 2374 | } |
95500969 | 2375 | packet_check_eom(); |
6cf44b6a | 2376 | /* Schedule the channel for cleanup/deletion. */ |
2377 | chan_mark_dead(c); | |
8efc0c15 | 2378 | } |
2379 | ||
04aa9e67 | 2380 | /* ARGSUSED */ |
8e7895b8 | 2381 | void |
7819b5c3 | 2382 | channel_input_window_adjust(int type, u_int32_t seq, void *ctxt) |
8e7895b8 | 2383 | { |
2384 | Channel *c; | |
f91d9a89 | 2385 | int id; |
2386 | u_int adjust; | |
3ffc6336 | 2387 | |
8e7895b8 | 2388 | if (!compat20) |
2389 | return; | |
8efc0c15 | 2390 | |
8e7895b8 | 2391 | /* Get the channel number and verify it. */ |
2392 | id = packet_get_int(); | |
2393 | c = channel_lookup(id); | |
2394 | ||
b872f7f0 | 2395 | if (c == NULL) { |
2396 | logit("Received window adjust for non-open channel %d.", id); | |
8e7895b8 | 2397 | return; |
2398 | } | |
2399 | adjust = packet_get_int(); | |
95500969 | 2400 | packet_check_eom(); |
f91d9a89 | 2401 | debug2("channel %d: rcvd adjust %u", id, adjust); |
8e7895b8 | 2402 | c->remote_window += adjust; |
2403 | } | |
2404 | ||
04aa9e67 | 2405 | /* ARGSUSED */ |
8e7895b8 | 2406 | void |
7819b5c3 | 2407 | channel_input_port_open(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2408 | { |
8e7895b8 | 2409 | Channel *c = NULL; |
2410 | u_short host_port; | |
2411 | char *host, *originator_string; | |
e07e21ad | 2412 | int remote_id; |
5260325f | 2413 | |
8e7895b8 | 2414 | remote_id = packet_get_int(); |
2415 | host = packet_get_string(NULL); | |
2416 | host_port = packet_get_int(); | |
2417 | ||
2418 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) { | |
2419 | originator_string = packet_get_string(NULL); | |
2420 | } else { | |
2421 | originator_string = xstrdup("unknown (remote did not supply name)"); | |
2422 | } | |
95500969 | 2423 | packet_check_eom(); |
e07e21ad | 2424 | c = channel_connect_to(host, host_port, |
2425 | "connected socket", originator_string); | |
0d942eff | 2426 | xfree(originator_string); |
e07e21ad | 2427 | xfree(host); |
8e7895b8 | 2428 | if (c == NULL) { |
2429 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
2430 | packet_put_int(remote_id); | |
2431 | packet_send(); | |
e07e21ad | 2432 | } else |
2433 | c->remote_id = remote_id; | |
8efc0c15 | 2434 | } |
2435 | ||
3593bdc0 | 2436 | /* ARGSUSED */ |
2437 | void | |
2438 | channel_input_status_confirm(int type, u_int32_t seq, void *ctxt) | |
2439 | { | |
2440 | Channel *c; | |
2441 | struct channel_confirm *cc; | |
b09b559d | 2442 | int id; |
3593bdc0 | 2443 | |
2444 | /* Reset keepalive timeout */ | |
dc1f1948 | 2445 | packet_set_alive_timeouts(0); |
3593bdc0 | 2446 | |
b09b559d | 2447 | id = packet_get_int(); |
3593bdc0 | 2448 | packet_check_eom(); |
2449 | ||
b09b559d | 2450 | debug2("channel_input_status_confirm: type %d id %d", type, id); |
3593bdc0 | 2451 | |
b09b559d | 2452 | if ((c = channel_lookup(id)) == NULL) { |
2453 | logit("channel_input_status_confirm: %d: unknown", id); | |
3593bdc0 | 2454 | return; |
2455 | } | |
2456 | ; | |
2457 | if ((cc = TAILQ_FIRST(&c->status_confirms)) == NULL) | |
2458 | return; | |
2459 | cc->cb(type, c, cc->ctx); | |
2460 | TAILQ_REMOVE(&c->status_confirms, cc, entry); | |
2461 | bzero(cc, sizeof(*cc)); | |
2462 | xfree(cc); | |
2463 | } | |
8e7895b8 | 2464 | |
2465 | /* -- tcp forwarding */ | |
2466 | ||
5e4a7219 | 2467 | void |
2468 | channel_set_af(int af) | |
2469 | { | |
2470 | IPv4or6 = af; | |
2471 | } | |
2472 | ||
fe7dba42 | 2473 | void |
2474 | channel_set_rdomain(int rdomain) | |
2475 | { | |
2476 | channel_rdomain = rdomain; | |
2477 | } | |
2478 | ||
5641aefa | 2479 | static int |
17525a70 | 2480 | channel_setup_fwd_listener(int type, const char *listen_addr, |
2481 | u_short listen_port, int *allocated_listen_port, | |
5641aefa | 2482 | const char *host_to_connect, u_short port_to_connect, int gateway_ports) |
8efc0c15 | 2483 | { |
719fc62f | 2484 | Channel *c; |
442aee3a | 2485 | int sock, r, success = 0, wildcard = 0, is_client; |
48e671d5 | 2486 | struct addrinfo hints, *ai, *aitop; |
3867aa0a | 2487 | const char *host, *addr; |
5641aefa | 2488 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
17525a70 | 2489 | in_port_t *lport_p; |
5260325f | 2490 | |
5641aefa | 2491 | host = (type == SSH_CHANNEL_RPORT_LISTENER) ? |
2492 | listen_addr : host_to_connect; | |
3867aa0a | 2493 | is_client = (type == SSH_CHANNEL_PORT_LISTENER); |
02a024dd | 2494 | |
5641aefa | 2495 | if (host == NULL) { |
2496 | error("No forward host name."); | |
38946c65 | 2497 | return 0; |
fa08c86b | 2498 | } |
920706fd | 2499 | if (strlen(host) >= NI_MAXHOST) { |
02a024dd | 2500 | error("Forward host name too long."); |
38946c65 | 2501 | return 0; |
02a024dd | 2502 | } |
5260325f | 2503 | |
3867aa0a | 2504 | /* |
2505 | * Determine whether or not a port forward listens to loopback, | |
f8cc7664 | 2506 | * specified address or wildcard. On the client, a specified bind |
2507 | * address will always override gateway_ports. On the server, a | |
2508 | * gateway_ports of 1 (``yes'') will override the client's | |
2509 | * specification and force a wildcard bind, whereas a value of 2 | |
2510 | * (``clientspecified'') will bind to whatever address the client | |
3867aa0a | 2511 | * asked for. |
2512 | * | |
2513 | * Special-case listen_addrs are: | |
2514 | * | |
2515 | * "0.0.0.0" -> wildcard v4/v6 if SSH_OLD_FORWARD_ADDR | |
2516 | * "" (empty string), "*" -> wildcard v4/v6 | |
2517 | * "localhost" -> loopback v4/v6 | |
2518 | */ | |
2519 | addr = NULL; | |
2520 | if (listen_addr == NULL) { | |
2521 | /* No address specified: default to gateway_ports setting */ | |
2522 | if (gateway_ports) | |
2523 | wildcard = 1; | |
2524 | } else if (gateway_ports || is_client) { | |
2525 | if (((datafellows & SSH_OLD_FORWARD_ADDR) && | |
bc4cc956 | 2526 | strcmp(listen_addr, "0.0.0.0") == 0 && is_client == 0) || |
3867aa0a | 2527 | *listen_addr == '\0' || strcmp(listen_addr, "*") == 0 || |
2528 | (!is_client && gateway_ports == 1)) | |
2529 | wildcard = 1; | |
2530 | else if (strcmp(listen_addr, "localhost") != 0) | |
2531 | addr = listen_addr; | |
2532 | } | |
2533 | ||
2534 | debug3("channel_setup_fwd_listener: type %d wildcard %d addr %s", | |
2535 | type, wildcard, (addr == NULL) ? "NULL" : addr); | |
2536 | ||
aa3378df | 2537 | /* |
48e671d5 | 2538 | * getaddrinfo returns a loopback address if the hostname is |
2539 | * set to NULL and hints.ai_flags is not AI_PASSIVE | |
aa3378df | 2540 | */ |
48e671d5 | 2541 | memset(&hints, 0, sizeof(hints)); |
2542 | hints.ai_family = IPv4or6; | |
3867aa0a | 2543 | hints.ai_flags = wildcard ? AI_PASSIVE : 0; |
48e671d5 | 2544 | hints.ai_socktype = SOCK_STREAM; |
fa08c86b | 2545 | snprintf(strport, sizeof strport, "%d", listen_port); |
3867aa0a | 2546 | if ((r = getaddrinfo(addr, strport, &hints, &aitop)) != 0) { |
2547 | if (addr == NULL) { | |
2548 | /* This really shouldn't happen */ | |
2549 | packet_disconnect("getaddrinfo: fatal error: %s", | |
bb4626fe | 2550 | ssh_gai_strerror(r)); |
3867aa0a | 2551 | } else { |
38946c65 | 2552 | error("channel_setup_fwd_listener: " |
bb4626fe | 2553 | "getaddrinfo(%.64s): %s", addr, |
2554 | ssh_gai_strerror(r)); | |
3867aa0a | 2555 | } |
38946c65 | 2556 | return 0; |
3867aa0a | 2557 | } |
17525a70 | 2558 | if (allocated_listen_port != NULL) |
2559 | *allocated_listen_port = 0; | |
48e671d5 | 2560 | for (ai = aitop; ai; ai = ai->ai_next) { |
17525a70 | 2561 | switch (ai->ai_family) { |
2562 | case AF_INET: | |
2563 | lport_p = &((struct sockaddr_in *)ai->ai_addr)-> | |
2564 | sin_port; | |
2565 | break; | |
2566 | case AF_INET6: | |
2567 | lport_p = &((struct sockaddr_in6 *)ai->ai_addr)-> | |
2568 | sin6_port; | |
2569 | break; | |
2570 | default: | |
48e671d5 | 2571 | continue; |
17525a70 | 2572 | } |
2573 | /* | |
2574 | * If allocating a port for -R forwards, then use the | |
2575 | * same port for all address families. | |
2576 | */ | |
2577 | if (type == SSH_CHANNEL_RPORT_LISTENER && listen_port == 0 && | |
2578 | allocated_listen_port != NULL && *allocated_listen_port > 0) | |
2579 | *lport_p = htons(*allocated_listen_port); | |
2580 | ||
48e671d5 | 2581 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), |
2582 | strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { | |
5641aefa | 2583 | error("channel_setup_fwd_listener: getnameinfo failed"); |
48e671d5 | 2584 | continue; |
2585 | } | |
2586 | /* Create a port to listen for the host. */ | |
fe7dba42 | 2587 | sock = socket_rdomain(ai->ai_family, ai->ai_socktype, |
2588 | ai->ai_protocol, channel_rdomain); | |
48e671d5 | 2589 | if (sock < 0) { |
2590 | /* this is no error since kernel may not support ipv6 */ | |
2591 | verbose("socket: %.100s", strerror(errno)); | |
2592 | continue; | |
2593 | } | |
442aee3a | 2594 | |
2595 | channel_set_reuseaddr(sock); | |
4e1082aa | 2596 | if (ai->ai_family == AF_INET6) |
2597 | sock_set_v6only(sock); | |
facfd613 | 2598 | |
17525a70 | 2599 | debug("Local forwarding listening on %s port %s.", |
2600 | ntop, strport); | |
48e671d5 | 2601 | |
2602 | /* Bind the socket to the address. */ | |
2603 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { | |
2604 | /* address can be in use ipv6 address is already bound */ | |
16218745 | 2605 | if (!ai->ai_next) |
2606 | error("bind: %.100s", strerror(errno)); | |
2607 | else | |
2608 | verbose("bind: %.100s", strerror(errno)); | |
2b87da3b | 2609 | |
48e671d5 | 2610 | close(sock); |
2611 | continue; | |
2612 | } | |
2613 | /* Start listening for connections on the socket. */ | |
fce39749 | 2614 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { |
48e671d5 | 2615 | error("listen: %.100s", strerror(errno)); |
2616 | close(sock); | |
2617 | continue; | |
2618 | } | |
17525a70 | 2619 | |
2620 | /* | |
2621 | * listen_port == 0 requests a dynamically allocated port - | |
2622 | * record what we got. | |
2623 | */ | |
2624 | if (type == SSH_CHANNEL_RPORT_LISTENER && listen_port == 0 && | |
2625 | allocated_listen_port != NULL && | |
2626 | *allocated_listen_port == 0) { | |
2627 | *allocated_listen_port = get_sock_port(sock, 1); | |
2628 | debug("Allocated listen port %d", | |
2629 | *allocated_listen_port); | |
2630 | } | |
2631 | ||
48e671d5 | 2632 | /* Allocate a channel number for the socket. */ |
8e7895b8 | 2633 | c = channel_new("port listener", type, sock, sock, -1, |
0b242b12 | 2634 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, |
0d942eff | 2635 | 0, "port listener", 1); |
1338ba77 | 2636 | c->path = xstrdup(host); |
719fc62f | 2637 | c->host_port = port_to_connect; |
2638 | c->listening_port = listen_port; | |
48e671d5 | 2639 | success = 1; |
2640 | } | |
2641 | if (success == 0) | |
5641aefa | 2642 | error("channel_setup_fwd_listener: cannot listen to port: %d", |
02a024dd | 2643 | listen_port); |
48e671d5 | 2644 | freeaddrinfo(aitop); |
02a024dd | 2645 | return success; |
5260325f | 2646 | } |
8efc0c15 | 2647 | |
d740ec16 | 2648 | int |
2649 | channel_cancel_rport_listener(const char *host, u_short port) | |
2650 | { | |
9a995072 | 2651 | u_int i; |
2652 | int found = 0; | |
d740ec16 | 2653 | |
f8cc7664 | 2654 | for (i = 0; i < channels_alloc; i++) { |
d740ec16 | 2655 | Channel *c = channels[i]; |
2656 | ||
2657 | if (c != NULL && c->type == SSH_CHANNEL_RPORT_LISTENER && | |
1338ba77 | 2658 | strcmp(c->path, host) == 0 && c->listening_port == port) { |
2912cbd6 | 2659 | debug2("%s: close channel %d", __func__, i); |
d740ec16 | 2660 | channel_free(c); |
2661 | found = 1; | |
2662 | } | |
2663 | } | |
2664 | ||
2665 | return (found); | |
2666 | } | |
2667 | ||
5641aefa | 2668 | /* protocol local port fwd, used by ssh (and sshd in v1) */ |
2669 | int | |
3867aa0a | 2670 | channel_setup_local_fwd_listener(const char *listen_host, u_short listen_port, |
5641aefa | 2671 | const char *host_to_connect, u_short port_to_connect, int gateway_ports) |
2672 | { | |
2673 | return channel_setup_fwd_listener(SSH_CHANNEL_PORT_LISTENER, | |
17525a70 | 2674 | listen_host, listen_port, NULL, host_to_connect, port_to_connect, |
3867aa0a | 2675 | gateway_ports); |
5641aefa | 2676 | } |
2677 | ||
2678 | /* protocol v2 remote port fwd, used by sshd */ | |
2679 | int | |
2680 | channel_setup_remote_fwd_listener(const char *listen_address, | |
17525a70 | 2681 | u_short listen_port, int *allocated_listen_port, int gateway_ports) |
5641aefa | 2682 | { |
2683 | return channel_setup_fwd_listener(SSH_CHANNEL_RPORT_LISTENER, | |
17525a70 | 2684 | listen_address, listen_port, allocated_listen_port, |
2685 | NULL, 0, gateway_ports); | |
5641aefa | 2686 | } |
2687 | ||
aa3378df | 2688 | /* |
2689 | * Initiate forwarding of connections to port "port" on remote host through | |
2690 | * the secure channel to host:port from local side. | |
2691 | */ | |
8efc0c15 | 2692 | |
42ea6f5e | 2693 | int |
3867aa0a | 2694 | channel_request_remote_forwarding(const char *listen_host, u_short listen_port, |
fa08c86b | 2695 | const char *host_to_connect, u_short port_to_connect) |
8efc0c15 | 2696 | { |
54a5250f | 2697 | int type, success = 0; |
fa08c86b | 2698 | |
5260325f | 2699 | /* Record locally that connection to this host/port is permitted. */ |
2700 | if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
2701 | fatal("channel_request_remote_forwarding: too many forwards"); | |
2702 | ||
5260325f | 2703 | /* Send the forward request to the remote side. */ |
7e7327a1 | 2704 | if (compat20) { |
3867aa0a | 2705 | const char *address_to_bind; |
04efe9b0 | 2706 | if (listen_host == NULL) { |
2707 | if (datafellows & SSH_BUG_RFWD_ADDR) | |
2708 | address_to_bind = "127.0.0.1"; | |
2709 | else | |
2710 | address_to_bind = "localhost"; | |
2711 | } else if (*listen_host == '\0' || | |
2712 | strcmp(listen_host, "*") == 0) { | |
2713 | if (datafellows & SSH_BUG_RFWD_ADDR) | |
2714 | address_to_bind = "0.0.0.0"; | |
2715 | else | |
2716 | address_to_bind = ""; | |
2717 | } else | |
3867aa0a | 2718 | address_to_bind = listen_host; |
2719 | ||
7e7327a1 | 2720 | packet_start(SSH2_MSG_GLOBAL_REQUEST); |
2721 | packet_put_cstring("tcpip-forward"); | |
e0ae8728 | 2722 | packet_put_char(1); /* boolean: want reply */ |
7e7327a1 | 2723 | packet_put_cstring(address_to_bind); |
2724 | packet_put_int(listen_port); | |
fa08c86b | 2725 | packet_send(); |
2726 | packet_write_wait(); | |
2727 | /* Assume that server accepts the request */ | |
2728 | success = 1; | |
7e7327a1 | 2729 | } else { |
2730 | packet_start(SSH_CMSG_PORT_FORWARD_REQUEST); | |
7e7327a1 | 2731 | packet_put_int(listen_port); |
d6f24e45 | 2732 | packet_put_cstring(host_to_connect); |
2733 | packet_put_int(port_to_connect); | |
7e7327a1 | 2734 | packet_send(); |
2735 | packet_write_wait(); | |
fa08c86b | 2736 | |
2737 | /* Wait for response from the remote side. */ | |
54a5250f | 2738 | type = packet_read(); |
fa08c86b | 2739 | switch (type) { |
2740 | case SSH_SMSG_SUCCESS: | |
2741 | success = 1; | |
2742 | break; | |
2743 | case SSH_SMSG_FAILURE: | |
fa08c86b | 2744 | break; |
2745 | default: | |
2746 | /* Unknown packet */ | |
2747 | packet_disconnect("Protocol error for port forward request:" | |
2748 | "received packet type %d.", type); | |
2749 | } | |
2750 | } | |
2751 | if (success) { | |
2752 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host_to_connect); | |
2753 | permitted_opens[num_permitted_opens].port_to_connect = port_to_connect; | |
2754 | permitted_opens[num_permitted_opens].listen_port = listen_port; | |
2755 | num_permitted_opens++; | |
7e7327a1 | 2756 | } |
42ea6f5e | 2757 | return (success ? 0 : -1); |
8efc0c15 | 2758 | } |
2759 | ||
d740ec16 | 2760 | /* |
f2107e97 | 2761 | * Request cancellation of remote forwarding of connection host:port from |
d740ec16 | 2762 | * local side. |
2763 | */ | |
d740ec16 | 2764 | void |
3867aa0a | 2765 | channel_request_rforward_cancel(const char *host, u_short port) |
d740ec16 | 2766 | { |
2767 | int i; | |
d740ec16 | 2768 | |
2769 | if (!compat20) | |
2770 | return; | |
2771 | ||
2772 | for (i = 0; i < num_permitted_opens; i++) { | |
f2107e97 | 2773 | if (permitted_opens[i].host_to_connect != NULL && |
d740ec16 | 2774 | permitted_opens[i].listen_port == port) |
2775 | break; | |
2776 | } | |
2777 | if (i >= num_permitted_opens) { | |
2778 | debug("%s: requested forward not found", __func__); | |
2779 | return; | |
2780 | } | |
2781 | packet_start(SSH2_MSG_GLOBAL_REQUEST); | |
2782 | packet_put_cstring("cancel-tcpip-forward"); | |
2783 | packet_put_char(0); | |
3867aa0a | 2784 | packet_put_cstring(host == NULL ? "" : host); |
d740ec16 | 2785 | packet_put_int(port); |
2786 | packet_send(); | |
2787 | ||
2788 | permitted_opens[i].listen_port = 0; | |
2789 | permitted_opens[i].port_to_connect = 0; | |
8c4bd764 | 2790 | xfree(permitted_opens[i].host_to_connect); |
d740ec16 | 2791 | permitted_opens[i].host_to_connect = NULL; |
2792 | } | |
2793 | ||
aa3378df | 2794 | /* |
2795 | * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates | |
2796 | * listening for the port, and sends back a success reply (or disconnect | |
42ea6f5e | 2797 | * message if there was an error). |
aa3378df | 2798 | */ |
42ea6f5e | 2799 | int |
1d1ffb87 | 2800 | channel_input_port_forward_request(int is_root, int gateway_ports) |
8efc0c15 | 2801 | { |
57112b5a | 2802 | u_short port, host_port; |
42ea6f5e | 2803 | int success = 0; |
5260325f | 2804 | char *hostname; |
2805 | ||
2806 | /* Get arguments from the packet. */ | |
2807 | port = packet_get_int(); | |
2808 | hostname = packet_get_string(NULL); | |
2809 | host_port = packet_get_int(); | |
2810 | ||
3c62e7eb | 2811 | #ifndef HAVE_CYGWIN |
aa3378df | 2812 | /* |
2813 | * Check that an unprivileged user is not trying to forward a | |
2814 | * privileged port. | |
2815 | */ | |
5260325f | 2816 | if (port < IPPORT_RESERVED && !is_root) |
8e7c9afc | 2817 | packet_disconnect( |
2818 | "Requested forwarding of port %d but user is not root.", | |
2819 | port); | |
2820 | if (host_port == 0) | |
2821 | packet_disconnect("Dynamic forwarding denied."); | |
3c62e7eb | 2822 | #endif |
8e7c9afc | 2823 | |
fa08c86b | 2824 | /* Initiate forwarding */ |
42ea6f5e | 2825 | success = channel_setup_local_fwd_listener(NULL, port, hostname, |
3867aa0a | 2826 | host_port, gateway_ports); |
5260325f | 2827 | |
2828 | /* Free the argument string. */ | |
2829 | xfree(hostname); | |
42ea6f5e | 2830 | |
2831 | return (success ? 0 : -1); | |
8efc0c15 | 2832 | } |
2833 | ||
01794848 | 2834 | /* |
2835 | * Permits opening to any host/port if permitted_opens[] is empty. This is | |
2836 | * usually called by the server, because the user could connect to any port | |
2837 | * anyway, and the server has no way to know but to trust the client anyway. | |
2838 | */ | |
2839 | void | |
d5bb9418 | 2840 | channel_permit_all_opens(void) |
01794848 | 2841 | { |
2842 | if (num_permitted_opens == 0) | |
2843 | all_opens_permitted = 1; | |
2844 | } | |
2845 | ||
cd332296 | 2846 | void |
01794848 | 2847 | channel_add_permitted_opens(char *host, int port) |
2848 | { | |
2849 | if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
42ea6f5e | 2850 | fatal("channel_add_permitted_opens: too many forwards"); |
01794848 | 2851 | debug("allow port forwarding to host %s port %d", host, port); |
2852 | ||
2853 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host); | |
2854 | permitted_opens[num_permitted_opens].port_to_connect = port; | |
2855 | num_permitted_opens++; | |
2856 | ||
2857 | all_opens_permitted = 0; | |
2858 | } | |
2859 | ||
ea46e550 | 2860 | int |
2fefbadf | 2861 | channel_add_adm_permitted_opens(char *host, int port) |
2862 | { | |
2863 | if (num_adm_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
2864 | fatal("channel_add_adm_permitted_opens: too many forwards"); | |
ea46e550 | 2865 | debug("config allows port forwarding to host %s port %d", host, port); |
2fefbadf | 2866 | |
2867 | permitted_adm_opens[num_adm_permitted_opens].host_to_connect | |
2868 | = xstrdup(host); | |
2869 | permitted_adm_opens[num_adm_permitted_opens].port_to_connect = port; | |
ea46e550 | 2870 | return ++num_adm_permitted_opens; |
2fefbadf | 2871 | } |
2872 | ||
cd332296 | 2873 | void |
01794848 | 2874 | channel_clear_permitted_opens(void) |
2875 | { | |
2876 | int i; | |
2877 | ||
2878 | for (i = 0; i < num_permitted_opens; i++) | |
d740ec16 | 2879 | if (permitted_opens[i].host_to_connect != NULL) |
2880 | xfree(permitted_opens[i].host_to_connect); | |
01794848 | 2881 | num_permitted_opens = 0; |
2fefbadf | 2882 | } |
2883 | ||
2884 | void | |
2885 | channel_clear_adm_permitted_opens(void) | |
2886 | { | |
2887 | int i; | |
01794848 | 2888 | |
2fefbadf | 2889 | for (i = 0; i < num_adm_permitted_opens; i++) |
2890 | if (permitted_adm_opens[i].host_to_connect != NULL) | |
2891 | xfree(permitted_adm_opens[i].host_to_connect); | |
2892 | num_adm_permitted_opens = 0; | |
01794848 | 2893 | } |
2894 | ||
1760c982 | 2895 | void |
2896 | channel_print_adm_permitted_opens(void) | |
2897 | { | |
cdfbc829 | 2898 | int i; |
1760c982 | 2899 | |
68405671 | 2900 | printf("permitopen"); |
861e9e53 | 2901 | if (num_adm_permitted_opens == 0) { |
68405671 | 2902 | printf(" any\n"); |
861e9e53 | 2903 | return; |
2904 | } | |
1760c982 | 2905 | for (i = 0; i < num_adm_permitted_opens; i++) |
2906 | if (permitted_adm_opens[i].host_to_connect != NULL) | |
2907 | printf(" %s:%d", permitted_adm_opens[i].host_to_connect, | |
2908 | permitted_adm_opens[i].port_to_connect); | |
68405671 | 2909 | printf("\n"); |
1760c982 | 2910 | } |
2911 | ||
e07e21ad | 2912 | /* Try to start non-blocking connect to next host in cctx list */ |
396c147e | 2913 | static int |
e07e21ad | 2914 | connect_next(struct channel_connect *cctx) |
8efc0c15 | 2915 | { |
e07e21ad | 2916 | int sock, saved_errno; |
48e671d5 | 2917 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
48e671d5 | 2918 | |
e07e21ad | 2919 | for (; cctx->ai; cctx->ai = cctx->ai->ai_next) { |
2920 | if (cctx->ai->ai_family != AF_INET && | |
2921 | cctx->ai->ai_family != AF_INET6) | |
48e671d5 | 2922 | continue; |
e07e21ad | 2923 | if (getnameinfo(cctx->ai->ai_addr, cctx->ai->ai_addrlen, |
2924 | ntop, sizeof(ntop), strport, sizeof(strport), | |
2925 | NI_NUMERICHOST|NI_NUMERICSERV) != 0) { | |
2926 | error("connect_next: getnameinfo failed"); | |
48e671d5 | 2927 | continue; |
5260325f | 2928 | } |
fe7dba42 | 2929 | if ((sock = socket_rdomain(cctx->ai->ai_family, |
2930 | cctx->ai->ai_socktype, cctx->ai->ai_protocol, | |
2931 | channel_rdomain)) == -1) { | |
e07e21ad | 2932 | if (cctx->ai->ai_next == NULL) |
4940c411 | 2933 | error("socket: %.100s", strerror(errno)); |
2934 | else | |
2935 | verbose("socket: %.100s", strerror(errno)); | |
48e671d5 | 2936 | continue; |
5260325f | 2937 | } |
170694d7 | 2938 | if (set_nonblock(sock) == -1) |
2939 | fatal("%s: set_nonblock(%d)", __func__, sock); | |
e07e21ad | 2940 | if (connect(sock, cctx->ai->ai_addr, |
2941 | cctx->ai->ai_addrlen) == -1 && errno != EINPROGRESS) { | |
2942 | debug("connect_next: host %.100s ([%.100s]:%s): " | |
2943 | "%.100s", cctx->host, ntop, strport, | |
48e671d5 | 2944 | strerror(errno)); |
e07e21ad | 2945 | saved_errno = errno; |
48e671d5 | 2946 | close(sock); |
e07e21ad | 2947 | errno = saved_errno; |
2b87da3b | 2948 | continue; /* fail -- try next */ |
48e671d5 | 2949 | } |
e07e21ad | 2950 | debug("connect_next: host %.100s ([%.100s]:%s) " |
2951 | "in progress, fd=%d", cctx->host, ntop, strport, sock); | |
2952 | cctx->ai = cctx->ai->ai_next; | |
2953 | set_nodelay(sock); | |
2954 | return sock; | |
2955 | } | |
2956 | return -1; | |
2957 | } | |
2958 | ||
2959 | static void | |
2960 | channel_connect_ctx_free(struct channel_connect *cctx) | |
2961 | { | |
2962 | xfree(cctx->host); | |
2963 | if (cctx->aitop) | |
2964 | freeaddrinfo(cctx->aitop); | |
2965 | bzero(cctx, sizeof(*cctx)); | |
2966 | cctx->host = NULL; | |
2967 | cctx->ai = cctx->aitop = NULL; | |
2968 | } | |
2969 | ||
2970 | /* Return CONNECTING channel to remote host, port */ | |
2971 | static Channel * | |
2972 | connect_to(const char *host, u_short port, char *ctype, char *rname) | |
2973 | { | |
2974 | struct addrinfo hints; | |
2975 | int gaierr; | |
2976 | int sock = -1; | |
2977 | char strport[NI_MAXSERV]; | |
2978 | struct channel_connect cctx; | |
2979 | Channel *c; | |
5260325f | 2980 | |
267d5589 | 2981 | memset(&cctx, 0, sizeof(cctx)); |
e07e21ad | 2982 | memset(&hints, 0, sizeof(hints)); |
2983 | hints.ai_family = IPv4or6; | |
2984 | hints.ai_socktype = SOCK_STREAM; | |
2985 | snprintf(strport, sizeof strport, "%d", port); | |
2986 | if ((gaierr = getaddrinfo(host, strport, &hints, &cctx.aitop)) != 0) { | |
2987 | error("connect_to %.100s: unknown host (%s)", host, | |
2988 | ssh_gai_strerror(gaierr)); | |
2989 | return NULL; | |
5260325f | 2990 | } |
e07e21ad | 2991 | |
2992 | cctx.host = xstrdup(host); | |
2993 | cctx.port = port; | |
2994 | cctx.ai = cctx.aitop; | |
2995 | ||
2996 | if ((sock = connect_next(&cctx)) == -1) { | |
2997 | error("connect to %.100s port %d failed: %s", | |
2998 | host, port, strerror(errno)); | |
2999 | channel_connect_ctx_free(&cctx); | |
3000 | return NULL; | |
8efc0c15 | 3001 | } |
e07e21ad | 3002 | c = channel_new(ctype, SSH_CHANNEL_CONNECTING, sock, sock, -1, |
3003 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, rname, 1); | |
3004 | c->connect_ctx = cctx; | |
3005 | return c; | |
7368a6c8 | 3006 | } |
01794848 | 3007 | |
e07e21ad | 3008 | Channel * |
3009 | channel_connect_by_listen_address(u_short listen_port, char *ctype, char *rname) | |
fa08c86b | 3010 | { |
3011 | int i; | |
01794848 | 3012 | |
e07e21ad | 3013 | for (i = 0; i < num_permitted_opens; i++) { |
d740ec16 | 3014 | if (permitted_opens[i].host_to_connect != NULL && |
e07e21ad | 3015 | permitted_opens[i].listen_port == listen_port) { |
01794848 | 3016 | return connect_to( |
fa08c86b | 3017 | permitted_opens[i].host_to_connect, |
e07e21ad | 3018 | permitted_opens[i].port_to_connect, ctype, rname); |
3019 | } | |
3020 | } | |
0b6fbf03 | 3021 | error("WARNING: Server requests forwarding for unknown listen_port %d", |
3022 | listen_port); | |
e07e21ad | 3023 | return NULL; |
fa08c86b | 3024 | } |
48e671d5 | 3025 | |
01794848 | 3026 | /* Check if connecting to that port is permitted and connect. */ |
e07e21ad | 3027 | Channel * |
3028 | channel_connect_to(const char *host, u_short port, char *ctype, char *rname) | |
01794848 | 3029 | { |
2fefbadf | 3030 | int i, permit, permit_adm = 1; |
01794848 | 3031 | |
3032 | permit = all_opens_permitted; | |
3033 | if (!permit) { | |
3034 | for (i = 0; i < num_permitted_opens; i++) | |
d740ec16 | 3035 | if (permitted_opens[i].host_to_connect != NULL && |
3036 | permitted_opens[i].port_to_connect == port && | |
01794848 | 3037 | strcmp(permitted_opens[i].host_to_connect, host) == 0) |
3038 | permit = 1; | |
2fefbadf | 3039 | } |
01794848 | 3040 | |
2fefbadf | 3041 | if (num_adm_permitted_opens > 0) { |
3042 | permit_adm = 0; | |
3043 | for (i = 0; i < num_adm_permitted_opens; i++) | |
3044 | if (permitted_adm_opens[i].host_to_connect != NULL && | |
3045 | permitted_adm_opens[i].port_to_connect == port && | |
3046 | strcmp(permitted_adm_opens[i].host_to_connect, host) | |
3047 | == 0) | |
3048 | permit_adm = 1; | |
01794848 | 3049 | } |
2fefbadf | 3050 | |
3051 | if (!permit || !permit_adm) { | |
bbe88b6d | 3052 | logit("Received request to connect to host %.100s port %d, " |
01794848 | 3053 | "but the request was denied.", host, port); |
e07e21ad | 3054 | return NULL; |
01794848 | 3055 | } |
e07e21ad | 3056 | return connect_to(host, port, ctype, rname); |
01794848 | 3057 | } |
3058 | ||
5e96b616 | 3059 | void |
3060 | channel_send_window_changes(void) | |
3061 | { | |
9a995072 | 3062 | u_int i; |
5e96b616 | 3063 | struct winsize ws; |
3064 | ||
3065 | for (i = 0; i < channels_alloc; i++) { | |
f8cc7664 | 3066 | if (channels[i] == NULL || !channels[i]->client_tty || |
5e96b616 | 3067 | channels[i]->type != SSH_CHANNEL_OPEN) |
3068 | continue; | |
3069 | if (ioctl(channels[i]->rfd, TIOCGWINSZ, &ws) < 0) | |
3070 | continue; | |
3071 | channel_request_start(i, "window-change", 0); | |
148de80c | 3072 | packet_put_int((u_int)ws.ws_col); |
3073 | packet_put_int((u_int)ws.ws_row); | |
3074 | packet_put_int((u_int)ws.ws_xpixel); | |
3075 | packet_put_int((u_int)ws.ws_ypixel); | |
5e96b616 | 3076 | packet_send(); |
3077 | } | |
3078 | } | |
3079 | ||
8e7895b8 | 3080 | /* -- X11 forwarding */ |
8efc0c15 | 3081 | |
aa3378df | 3082 | /* |
3083 | * Creates an internet domain socket for listening for X11 connections. | |
57f228e8 | 3084 | * Returns 0 and a suitable display number for the DISPLAY variable |
3085 | * stored in display_numberp , or -1 if an error occurs. | |
aa3378df | 3086 | */ |
c9d0ad9b | 3087 | int |
e6e573bd | 3088 | x11_create_display_inet(int x11_display_offset, int x11_use_localhost, |
d08341e6 | 3089 | int single_connection, u_int *display_numberp, int **chanids) |
8efc0c15 | 3090 | { |
ac151b18 | 3091 | Channel *nc = NULL; |
57112b5a | 3092 | int display_number, sock; |
3093 | u_short port; | |
48e671d5 | 3094 | struct addrinfo hints, *ai, *aitop; |
3095 | char strport[NI_MAXSERV]; | |
3096 | int gaierr, n, num_socks = 0, socks[NUM_SOCKS]; | |
5260325f | 3097 | |
59e5aff5 | 3098 | if (chanids == NULL) |
3099 | return -1; | |
3100 | ||
95f1eccc | 3101 | for (display_number = x11_display_offset; |
184eed6a | 3102 | display_number < MAX_DISPLAYS; |
3103 | display_number++) { | |
5260325f | 3104 | port = 6000 + display_number; |
48e671d5 | 3105 | memset(&hints, 0, sizeof(hints)); |
3106 | hints.ai_family = IPv4or6; | |
e6e573bd | 3107 | hints.ai_flags = x11_use_localhost ? 0: AI_PASSIVE; |
48e671d5 | 3108 | hints.ai_socktype = SOCK_STREAM; |
3109 | snprintf(strport, sizeof strport, "%d", port); | |
3110 | if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) { | |
bb4626fe | 3111 | error("getaddrinfo: %.100s", ssh_gai_strerror(gaierr)); |
c9d0ad9b | 3112 | return -1; |
5260325f | 3113 | } |
48e671d5 | 3114 | for (ai = aitop; ai; ai = ai->ai_next) { |
3115 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
3116 | continue; | |
fe7dba42 | 3117 | sock = socket_rdomain(ai->ai_family, ai->ai_socktype, |
3118 | ai->ai_protocol, channel_rdomain); | |
48e671d5 | 3119 | if (sock < 0) { |
4ee81249 | 3120 | if ((errno != EINVAL) && (errno != EAFNOSUPPORT)) { |
80a44451 | 3121 | error("socket: %.100s", strerror(errno)); |
0ea89f7e | 3122 | freeaddrinfo(aitop); |
c9d0ad9b | 3123 | return -1; |
80a44451 | 3124 | } else { |
22d89d24 | 3125 | debug("x11_create_display_inet: Socket family %d not supported", |
3126 | ai->ai_family); | |
80a44451 | 3127 | continue; |
3128 | } | |
48e671d5 | 3129 | } |
4e1082aa | 3130 | if (ai->ai_family == AF_INET6) |
3131 | sock_set_v6only(sock); | |
554ebbed | 3132 | if (x11_use_localhost) |
3133 | channel_set_reuseaddr(sock); | |
48e671d5 | 3134 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { |
d7ac5f18 | 3135 | debug2("bind port %d: %.100s", port, strerror(errno)); |
48e671d5 | 3136 | close(sock); |
16218745 | 3137 | |
48e671d5 | 3138 | for (n = 0; n < num_socks; n++) { |
48e671d5 | 3139 | close(socks[n]); |
3140 | } | |
3141 | num_socks = 0; | |
3142 | break; | |
3143 | } | |
3144 | socks[num_socks++] = sock; | |
3145 | if (num_socks == NUM_SOCKS) | |
3146 | break; | |
5260325f | 3147 | } |
4ccb01d6 | 3148 | freeaddrinfo(aitop); |
48e671d5 | 3149 | if (num_socks > 0) |
3150 | break; | |
5260325f | 3151 | } |
3152 | if (display_number >= MAX_DISPLAYS) { | |
3153 | error("Failed to allocate internet-domain X11 display socket."); | |
c9d0ad9b | 3154 | return -1; |
8efc0c15 | 3155 | } |
5260325f | 3156 | /* Start listening for connections on the socket. */ |
48e671d5 | 3157 | for (n = 0; n < num_socks; n++) { |
3158 | sock = socks[n]; | |
fce39749 | 3159 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { |
48e671d5 | 3160 | error("listen: %.100s", strerror(errno)); |
48e671d5 | 3161 | close(sock); |
c9d0ad9b | 3162 | return -1; |
a7effaac | 3163 | } |
a7effaac | 3164 | } |
5260325f | 3165 | |
48e671d5 | 3166 | /* Allocate a channel for each socket. */ |
52e3daed | 3167 | *chanids = xcalloc(num_socks + 1, sizeof(**chanids)); |
48e671d5 | 3168 | for (n = 0; n < num_socks; n++) { |
3169 | sock = socks[n]; | |
ac151b18 | 3170 | nc = channel_new("x11 listener", |
0b242b12 | 3171 | SSH_CHANNEL_X11_LISTENER, sock, sock, -1, |
3172 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, | |
0d942eff | 3173 | 0, "X11 inet listener", 1); |
3a0d3d54 | 3174 | nc->single_connection = single_connection; |
59e5aff5 | 3175 | (*chanids)[n] = nc->self; |
48e671d5 | 3176 | } |
59e5aff5 | 3177 | (*chanids)[n] = -1; |
5260325f | 3178 | |
c9d0ad9b | 3179 | /* Return the display number for the DISPLAY environment variable. */ |
57f228e8 | 3180 | *display_numberp = display_number; |
3181 | return (0); | |
8efc0c15 | 3182 | } |
3183 | ||
396c147e | 3184 | static int |
b5a1596f | 3185 | connect_local_xsocket_path(const char *pathname) |
8efc0c15 | 3186 | { |
5260325f | 3187 | int sock; |
3188 | struct sockaddr_un addr; | |
5260325f | 3189 | |
805e659f | 3190 | sock = socket(AF_UNIX, SOCK_STREAM, 0); |
3191 | if (sock < 0) | |
3192 | error("socket: %.100s", strerror(errno)); | |
3193 | memset(&addr, 0, sizeof(addr)); | |
3194 | addr.sun_family = AF_UNIX; | |
b5a1596f | 3195 | strlcpy(addr.sun_path, pathname, sizeof addr.sun_path); |
32596c7b | 3196 | if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) == 0) |
805e659f | 3197 | return sock; |
3198 | close(sock); | |
5260325f | 3199 | error("connect %.100s: %.100s", addr.sun_path, strerror(errno)); |
3200 | return -1; | |
8efc0c15 | 3201 | } |
3202 | ||
b5a1596f | 3203 | static int |
3204 | connect_local_xsocket(u_int dnr) | |
3205 | { | |
3206 | char buf[1024]; | |
3207 | snprintf(buf, sizeof buf, _PATH_UNIX_X, dnr); | |
3208 | return connect_local_xsocket_path(buf); | |
3209 | } | |
3210 | ||
0b242b12 | 3211 | int |
3212 | x11_connect_display(void) | |
8efc0c15 | 3213 | { |
4f16046f | 3214 | u_int display_number; |
5260325f | 3215 | const char *display; |
0b242b12 | 3216 | char buf[1024], *cp; |
48e671d5 | 3217 | struct addrinfo hints, *ai, *aitop; |
3218 | char strport[NI_MAXSERV]; | |
4f16046f | 3219 | int gaierr, sock = 0; |
5260325f | 3220 | |
5260325f | 3221 | /* Try to open a socket for the local X server. */ |
3222 | display = getenv("DISPLAY"); | |
3223 | if (!display) { | |
3224 | error("DISPLAY not set."); | |
0b242b12 | 3225 | return -1; |
5260325f | 3226 | } |
aa3378df | 3227 | /* |
3228 | * Now we decode the value of the DISPLAY variable and make a | |
3229 | * connection to the real X server. | |
3230 | */ | |
3231 | ||
b5a1596f | 3232 | /* Check if the display is from launchd. */ |
3233 | #ifdef __APPLE__ | |
3234 | if (strncmp(display, "/tmp/launch", 11) == 0) { | |
3235 | sock = connect_local_xsocket_path(display); | |
3236 | if (sock < 0) | |
3237 | return -1; | |
3238 | ||
3239 | /* OK, we now have a connection to the display. */ | |
3240 | return sock; | |
3241 | } | |
3242 | #endif | |
aa3378df | 3243 | /* |
3244 | * Check if it is a unix domain socket. Unix domain displays are in | |
3245 | * one of the following formats: unix:d[.s], :d[.s], ::d[.s] | |
3246 | */ | |
5260325f | 3247 | if (strncmp(display, "unix:", 5) == 0 || |
3248 | display[0] == ':') { | |
3249 | /* Connect to the unix domain socket. */ | |
4f16046f | 3250 | if (sscanf(strrchr(display, ':') + 1, "%u", &display_number) != 1) { |
5260325f | 3251 | error("Could not parse display number from DISPLAY: %.100s", |
184eed6a | 3252 | display); |
0b242b12 | 3253 | return -1; |
5260325f | 3254 | } |
3255 | /* Create a socket. */ | |
3256 | sock = connect_local_xsocket(display_number); | |
3257 | if (sock < 0) | |
0b242b12 | 3258 | return -1; |
5260325f | 3259 | |
3260 | /* OK, we now have a connection to the display. */ | |
0b242b12 | 3261 | return sock; |
5260325f | 3262 | } |
aa3378df | 3263 | /* |
3264 | * Connect to an inet socket. The DISPLAY value is supposedly | |
3265 | * hostname:d[.s], where hostname may also be numeric IP address. | |
3266 | */ | |
74860245 | 3267 | strlcpy(buf, display, sizeof(buf)); |
5260325f | 3268 | cp = strchr(buf, ':'); |
3269 | if (!cp) { | |
3270 | error("Could not find ':' in DISPLAY: %.100s", display); | |
0b242b12 | 3271 | return -1; |
5260325f | 3272 | } |
3273 | *cp = 0; | |
aa3378df | 3274 | /* buf now contains the host name. But first we parse the display number. */ |
4f16046f | 3275 | if (sscanf(cp + 1, "%u", &display_number) != 1) { |
5260325f | 3276 | error("Could not parse display number from DISPLAY: %.100s", |
184eed6a | 3277 | display); |
0b242b12 | 3278 | return -1; |
5260325f | 3279 | } |
5260325f | 3280 | |
48e671d5 | 3281 | /* Look up the host address */ |
3282 | memset(&hints, 0, sizeof(hints)); | |
3283 | hints.ai_family = IPv4or6; | |
3284 | hints.ai_socktype = SOCK_STREAM; | |
4f16046f | 3285 | snprintf(strport, sizeof strport, "%u", 6000 + display_number); |
48e671d5 | 3286 | if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) { |
bb4626fe | 3287 | error("%.100s: unknown host. (%s)", buf, |
3288 | ssh_gai_strerror(gaierr)); | |
0b242b12 | 3289 | return -1; |
8efc0c15 | 3290 | } |
48e671d5 | 3291 | for (ai = aitop; ai; ai = ai->ai_next) { |
3292 | /* Create a socket. */ | |
fe7dba42 | 3293 | sock = socket_rdomain(ai->ai_family, ai->ai_socktype, |
3294 | ai->ai_protocol, channel_rdomain); | |
48e671d5 | 3295 | if (sock < 0) { |
d7ac5f18 | 3296 | debug2("socket: %.100s", strerror(errno)); |
7368a6c8 | 3297 | continue; |
3298 | } | |
3299 | /* Connect it to the display. */ | |
3300 | if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) { | |
4f16046f | 3301 | debug2("connect %.100s port %u: %.100s", buf, |
7368a6c8 | 3302 | 6000 + display_number, strerror(errno)); |
3303 | close(sock); | |
3304 | continue; | |
3305 | } | |
3306 | /* Success */ | |
3307 | break; | |
48e671d5 | 3308 | } |
48e671d5 | 3309 | freeaddrinfo(aitop); |
3310 | if (!ai) { | |
4f16046f | 3311 | error("connect %.100s port %u: %.100s", buf, 6000 + display_number, |
48e671d5 | 3312 | strerror(errno)); |
0b242b12 | 3313 | return -1; |
8efc0c15 | 3314 | } |
bcc0381e | 3315 | set_nodelay(sock); |
0b242b12 | 3316 | return sock; |
3317 | } | |
5260325f | 3318 | |
0b242b12 | 3319 | /* |
3320 | * This is called when SSH_SMSG_X11_OPEN is received. The packet contains | |
3321 | * the remote channel number. We should do whatever we want, and respond | |
3322 | * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE. | |
3323 | */ | |
5260325f | 3324 | |
ebb90778 | 3325 | /* ARGSUSED */ |
0b242b12 | 3326 | void |
7819b5c3 | 3327 | x11_input_open(int type, u_int32_t seq, void *ctxt) |
0b242b12 | 3328 | { |
719fc62f | 3329 | Channel *c = NULL; |
3330 | int remote_id, sock = 0; | |
0b242b12 | 3331 | char *remote_host; |
5260325f | 3332 | |
719fc62f | 3333 | debug("Received X11 open request."); |
5260325f | 3334 | |
719fc62f | 3335 | remote_id = packet_get_int(); |
8e7895b8 | 3336 | |
3337 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) { | |
719fc62f | 3338 | remote_host = packet_get_string(NULL); |
0b242b12 | 3339 | } else { |
3340 | remote_host = xstrdup("unknown (remote did not supply name)"); | |
0b242b12 | 3341 | } |
95500969 | 3342 | packet_check_eom(); |
0b242b12 | 3343 | |
3344 | /* Obtain a connection to the real X display. */ | |
3345 | sock = x11_connect_display(); | |
719fc62f | 3346 | if (sock != -1) { |
3347 | /* Allocate a channel for this connection. */ | |
3348 | c = channel_new("connected x11 socket", | |
3349 | SSH_CHANNEL_X11_OPEN, sock, sock, -1, 0, 0, 0, | |
3350 | remote_host, 1); | |
3a0d3d54 | 3351 | c->remote_id = remote_id; |
3352 | c->force_drain = 1; | |
719fc62f | 3353 | } |
0d942eff | 3354 | xfree(remote_host); |
719fc62f | 3355 | if (c == NULL) { |
0b242b12 | 3356 | /* Send refusal to the remote host. */ |
3357 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
719fc62f | 3358 | packet_put_int(remote_id); |
0b242b12 | 3359 | } else { |
0b242b12 | 3360 | /* Send a confirmation to the remote host. */ |
3361 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
719fc62f | 3362 | packet_put_int(remote_id); |
3363 | packet_put_int(c->self); | |
0b242b12 | 3364 | } |
719fc62f | 3365 | packet_send(); |
8efc0c15 | 3366 | } |
3367 | ||
a22aff1f | 3368 | /* dummy protocol handler that denies SSH-1 requests (agent/x11) */ |
ebb90778 | 3369 | /* ARGSUSED */ |
a22aff1f | 3370 | void |
7819b5c3 | 3371 | deny_input_open(int type, u_int32_t seq, void *ctxt) |
a22aff1f | 3372 | { |
3373 | int rchan = packet_get_int(); | |
e1feb9bf | 3374 | |
6aacefa7 | 3375 | switch (type) { |
a22aff1f | 3376 | case SSH_SMSG_AGENT_OPEN: |
3377 | error("Warning: ssh server tried agent forwarding."); | |
3378 | break; | |
3379 | case SSH_SMSG_X11_OPEN: | |
3380 | error("Warning: ssh server tried X11 forwarding."); | |
3381 | break; | |
3382 | default: | |
7819b5c3 | 3383 | error("deny_input_open: type %d", type); |
a22aff1f | 3384 | break; |
3385 | } | |
1908529f | 3386 | error("Warning: this is probably a break-in attempt by a malicious server."); |
a22aff1f | 3387 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
3388 | packet_put_int(rchan); | |
3389 | packet_send(); | |
3390 | } | |
3391 | ||
aa3378df | 3392 | /* |
3393 | * Requests forwarding of X11 connections, generates fake authentication | |
3394 | * data, and enables authentication spoofing. | |
8e7895b8 | 3395 | * This should be called in the client only. |
aa3378df | 3396 | */ |
6ae2364d | 3397 | void |
9bf083eb | 3398 | x11_request_forwarding_with_spoofing(int client_session_id, const char *disp, |
0b242b12 | 3399 | const char *proto, const char *data) |
8efc0c15 | 3400 | { |
1e3b8b07 | 3401 | u_int data_len = (u_int) strlen(data) / 2; |
ef07103c | 3402 | u_int i, value; |
5260325f | 3403 | char *new_data; |
3404 | int screen_number; | |
3405 | const char *cp; | |
ca75d7de | 3406 | u_int32_t rnd = 0; |
5260325f | 3407 | |
4297b666 | 3408 | if (x11_saved_display == NULL) |
3409 | x11_saved_display = xstrdup(disp); | |
3410 | else if (strcmp(disp, x11_saved_display) != 0) { | |
ef07103c | 3411 | error("x11_request_forwarding_with_spoofing: different " |
3412 | "$DISPLAY already forwarded"); | |
3413 | return; | |
3414 | } | |
3415 | ||
0875ae22 | 3416 | cp = strchr(disp, ':'); |
5260325f | 3417 | if (cp) |
3418 | cp = strchr(cp, '.'); | |
3419 | if (cp) | |
d6d4897e | 3420 | screen_number = (u_int)strtonum(cp + 1, 0, 400, NULL); |
5260325f | 3421 | else |
3422 | screen_number = 0; | |
3423 | ||
ef07103c | 3424 | if (x11_saved_proto == NULL) { |
3425 | /* Save protocol name. */ | |
3426 | x11_saved_proto = xstrdup(proto); | |
3427 | /* | |
56964485 | 3428 | * Extract real authentication data and generate fake data |
ef07103c | 3429 | * of the same length. |
3430 | */ | |
3431 | x11_saved_data = xmalloc(data_len); | |
3432 | x11_fake_data = xmalloc(data_len); | |
3433 | for (i = 0; i < data_len; i++) { | |
3434 | if (sscanf(data + 2 * i, "%2x", &value) != 1) | |
3435 | fatal("x11_request_forwarding: bad " | |
3436 | "authentication data: %.100s", data); | |
3437 | if (i % 4 == 0) | |
3438 | rnd = arc4random(); | |
3439 | x11_saved_data[i] = value; | |
3440 | x11_fake_data[i] = rnd & 0xff; | |
3441 | rnd >>= 8; | |
3442 | } | |
3443 | x11_saved_data_len = data_len; | |
3444 | x11_fake_data_len = data_len; | |
3445 | } | |
5260325f | 3446 | |
3447 | /* Convert the fake data into hex. */ | |
ef07103c | 3448 | new_data = tohex(x11_fake_data, data_len); |
5260325f | 3449 | |
3450 | /* Send the request packet. */ | |
0b242b12 | 3451 | if (compat20) { |
3452 | channel_request_start(client_session_id, "x11-req", 0); | |
3453 | packet_put_char(0); /* XXX bool single connection */ | |
3454 | } else { | |
3455 | packet_start(SSH_CMSG_X11_REQUEST_FORWARDING); | |
3456 | } | |
3457 | packet_put_cstring(proto); | |
3458 | packet_put_cstring(new_data); | |
5260325f | 3459 | packet_put_int(screen_number); |
3460 | packet_send(); | |
3461 | packet_write_wait(); | |
3462 | xfree(new_data); | |
8efc0c15 | 3463 | } |
3464 | ||
8e7895b8 | 3465 | |
3466 | /* -- agent forwarding */ | |
3467 | ||
8efc0c15 | 3468 | /* Sends a message to the server to request authentication fd forwarding. */ |
3469 | ||
6ae2364d | 3470 | void |
d5bb9418 | 3471 | auth_request_forwarding(void) |
8efc0c15 | 3472 | { |
5260325f | 3473 | packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING); |
3474 | packet_send(); | |
3475 | packet_write_wait(); | |
8efc0c15 | 3476 | } |