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3d738e65 | 1 | /* $OpenBSD: channels.c,v 1.296 2009/05/25 06:48:00 andreas Exp $ */ |
3c0ef626 | 2 | /* |
3 | * Author: Tatu Ylonen <ylo@cs.hut.fi> | |
4 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
5 | * All rights reserved | |
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. | |
9 | * | |
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 | * | |
16 | * SSH2 support added by Markus Friedl. | |
e9a17296 | 17 | * Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved. |
3c0ef626 | 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. | |
40 | */ | |
41 | ||
42 | #include "includes.h" | |
3c0ef626 | 43 | |
9108f8d9 | 44 | #include <sys/types.h> |
45 | #include <sys/ioctl.h> | |
46 | #include <sys/un.h> | |
47 | #include <sys/socket.h> | |
48 | #ifdef HAVE_SYS_TIME_H | |
49 | # include <sys/time.h> | |
50 | #endif | |
51 | ||
52 | #include <netinet/in.h> | |
53 | #include <arpa/inet.h> | |
54 | ||
55 | #include <errno.h> | |
56 | #include <netdb.h> | |
57 | #include <stdio.h> | |
58 | #include <stdlib.h> | |
59 | #include <string.h> | |
60 | #include <termios.h> | |
61 | #include <unistd.h> | |
62 | #include <stdarg.h> | |
63 | ||
22616013 | 64 | #include "openbsd-compat/sys-queue.h" |
9108f8d9 | 65 | #include "xmalloc.h" |
3c0ef626 | 66 | #include "ssh.h" |
67 | #include "ssh1.h" | |
68 | #include "ssh2.h" | |
69 | #include "packet.h" | |
3c0ef626 | 70 | #include "log.h" |
71 | #include "misc.h" | |
9108f8d9 | 72 | #include "buffer.h" |
3c0ef626 | 73 | #include "channels.h" |
74 | #include "compat.h" | |
75 | #include "canohost.h" | |
76 | #include "key.h" | |
77 | #include "authfd.h" | |
e9a17296 | 78 | #include "pathnames.h" |
3c0ef626 | 79 | |
80 | /* -- channel core */ | |
81 | ||
82 | /* | |
83 | * Pointer to an array containing all allocated channels. The array is | |
84 | * dynamically extended as needed. | |
85 | */ | |
86 | static Channel **channels = NULL; | |
87 | ||
88 | /* | |
89 | * Size of the channel array. All slots of the array must always be | |
90 | * initialized (at least the type field); unused slots set to NULL | |
91 | */ | |
c9f39d2c | 92 | static u_int channels_alloc = 0; |
3c0ef626 | 93 | |
94 | /* | |
95 | * Maximum file descriptor value used in any of the channels. This is | |
96 | * updated in channel_new. | |
97 | */ | |
98 | static int channel_max_fd = 0; | |
99 | ||
100 | ||
101 | /* -- tcp forwarding */ | |
102 | ||
103 | /* | |
104 | * Data structure for storing which hosts are permitted for forward requests. | |
105 | * The local sides of any remote forwards are stored in this array to prevent | |
106 | * a corrupt remote server from accessing arbitrary TCP/IP ports on our local | |
107 | * network (which might be behind a firewall). | |
108 | */ | |
109 | typedef struct { | |
110 | char *host_to_connect; /* Connect to 'host'. */ | |
111 | u_short port_to_connect; /* Connect to 'port'. */ | |
112 | u_short listen_port; /* Remote side should listen port number. */ | |
113 | } ForwardPermission; | |
114 | ||
9108f8d9 | 115 | /* List of all permitted host/port pairs to connect by the user. */ |
3c0ef626 | 116 | static ForwardPermission permitted_opens[SSH_MAX_FORWARDS_PER_DIRECTION]; |
117 | ||
9108f8d9 | 118 | /* List of all permitted host/port pairs to connect by the admin. */ |
119 | static ForwardPermission permitted_adm_opens[SSH_MAX_FORWARDS_PER_DIRECTION]; | |
120 | ||
121 | /* Number of permitted host/port pairs in the array permitted by the user. */ | |
3c0ef626 | 122 | static int num_permitted_opens = 0; |
9108f8d9 | 123 | |
124 | /* Number of permitted host/port pair in the array permitted by the admin. */ | |
125 | static int num_adm_permitted_opens = 0; | |
126 | ||
3c0ef626 | 127 | /* |
128 | * If this is true, all opens are permitted. This is the case on the server | |
129 | * on which we have to trust the client anyway, and the user could do | |
130 | * anything after logging in anyway. | |
131 | */ | |
132 | static int all_opens_permitted = 0; | |
133 | ||
134 | ||
135 | /* -- X11 forwarding */ | |
136 | ||
137 | /* Maximum number of fake X11 displays to try. */ | |
138 | #define MAX_DISPLAYS 1000 | |
139 | ||
665a873d | 140 | /* Saved X11 local (client) display. */ |
141 | static char *x11_saved_display = NULL; | |
142 | ||
3c0ef626 | 143 | /* Saved X11 authentication protocol name. */ |
144 | static char *x11_saved_proto = NULL; | |
145 | ||
146 | /* Saved X11 authentication data. This is the real data. */ | |
147 | static char *x11_saved_data = NULL; | |
148 | static u_int x11_saved_data_len = 0; | |
149 | ||
150 | /* | |
151 | * Fake X11 authentication data. This is what the server will be sending us; | |
152 | * we should replace any occurrences of this by the real data. | |
153 | */ | |
9108f8d9 | 154 | static u_char *x11_fake_data = NULL; |
3c0ef626 | 155 | static u_int x11_fake_data_len; |
156 | ||
157 | ||
158 | /* -- agent forwarding */ | |
159 | ||
160 | #define NUM_SOCKS 10 | |
161 | ||
3c0ef626 | 162 | /* AF_UNSPEC or AF_INET or AF_INET6 */ |
163 | static int IPv4or6 = AF_UNSPEC; | |
164 | ||
165 | /* helper */ | |
166 | static void port_open_helper(Channel *c, char *rtype); | |
167 | ||
22616013 | 168 | /* non-blocking connect helpers */ |
169 | static int connect_next(struct channel_connect *); | |
170 | static void channel_connect_ctx_free(struct channel_connect *); | |
171 | ||
3c0ef626 | 172 | /* -- channel core */ |
173 | ||
174 | Channel * | |
2c06c99b | 175 | channel_by_id(int id) |
3c0ef626 | 176 | { |
177 | Channel *c; | |
178 | ||
c9f39d2c | 179 | if (id < 0 || (u_int)id >= channels_alloc) { |
2c06c99b | 180 | logit("channel_by_id: %d: bad id", id); |
3c0ef626 | 181 | return NULL; |
182 | } | |
183 | c = channels[id]; | |
184 | if (c == NULL) { | |
2c06c99b | 185 | logit("channel_by_id: %d: bad id: channel free", id); |
3c0ef626 | 186 | return NULL; |
187 | } | |
188 | return c; | |
189 | } | |
190 | ||
2c06c99b | 191 | /* |
192 | * Returns the channel if it is allowed to receive protocol messages. | |
193 | * Private channels, like listening sockets, may not receive messages. | |
194 | */ | |
195 | Channel * | |
196 | channel_lookup(int id) | |
197 | { | |
198 | Channel *c; | |
199 | ||
200 | if ((c = channel_by_id(id)) == NULL) | |
201 | return (NULL); | |
202 | ||
9108f8d9 | 203 | switch (c->type) { |
2c06c99b | 204 | case SSH_CHANNEL_X11_OPEN: |
205 | case SSH_CHANNEL_LARVAL: | |
206 | case SSH_CHANNEL_CONNECTING: | |
207 | case SSH_CHANNEL_DYNAMIC: | |
208 | case SSH_CHANNEL_OPENING: | |
209 | case SSH_CHANNEL_OPEN: | |
210 | case SSH_CHANNEL_INPUT_DRAINING: | |
211 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
212 | return (c); | |
2c06c99b | 213 | } |
214 | logit("Non-public channel %d, type %d.", id, c->type); | |
215 | return (NULL); | |
216 | } | |
217 | ||
3c0ef626 | 218 | /* |
219 | * Register filedescriptors for a channel, used when allocating a channel or | |
220 | * when the channel consumer/producer is ready, e.g. shell exec'd | |
221 | */ | |
3c0ef626 | 222 | static void |
223 | channel_register_fds(Channel *c, int rfd, int wfd, int efd, | |
22616013 | 224 | int extusage, int nonblock, int is_tty) |
3c0ef626 | 225 | { |
226 | /* Update the maximum file descriptor value. */ | |
227 | channel_max_fd = MAX(channel_max_fd, rfd); | |
228 | channel_max_fd = MAX(channel_max_fd, wfd); | |
229 | channel_max_fd = MAX(channel_max_fd, efd); | |
230 | ||
231 | /* XXX set close-on-exec -markus */ | |
232 | ||
233 | c->rfd = rfd; | |
234 | c->wfd = wfd; | |
235 | c->sock = (rfd == wfd) ? rfd : -1; | |
c9f39d2c | 236 | c->ctl_fd = -1; /* XXX: set elsewhere */ |
3c0ef626 | 237 | c->efd = efd; |
238 | c->extended_usage = extusage; | |
239 | ||
22616013 | 240 | if ((c->isatty = is_tty) != 0) |
0fff78ff | 241 | debug2("channel %d: rfd %d isatty", c->self, c->rfd); |
22616013 | 242 | c->wfd_isatty = is_tty || isatty(c->wfd); |
3c0ef626 | 243 | |
244 | /* enable nonblocking mode */ | |
245 | if (nonblock) { | |
246 | if (rfd != -1) | |
247 | set_nonblock(rfd); | |
248 | if (wfd != -1) | |
249 | set_nonblock(wfd); | |
250 | if (efd != -1) | |
251 | set_nonblock(efd); | |
252 | } | |
253 | } | |
254 | ||
255 | /* | |
256 | * Allocate a new channel object and set its type and socket. This will cause | |
257 | * remote_name to be freed. | |
258 | */ | |
3c0ef626 | 259 | Channel * |
260 | channel_new(char *ctype, int type, int rfd, int wfd, int efd, | |
680cee3b | 261 | u_int window, u_int maxpack, int extusage, char *remote_name, int nonblock) |
3c0ef626 | 262 | { |
c9f39d2c | 263 | int found; |
264 | u_int i; | |
3c0ef626 | 265 | Channel *c; |
266 | ||
267 | /* Do initial allocation if this is the first call. */ | |
268 | if (channels_alloc == 0) { | |
3c0ef626 | 269 | channels_alloc = 10; |
9108f8d9 | 270 | channels = xcalloc(channels_alloc, sizeof(Channel *)); |
3c0ef626 | 271 | for (i = 0; i < channels_alloc; i++) |
272 | channels[i] = NULL; | |
3c0ef626 | 273 | } |
274 | /* Try to find a free slot where to put the new channel. */ | |
275 | for (found = -1, i = 0; i < channels_alloc; i++) | |
276 | if (channels[i] == NULL) { | |
277 | /* Found a free slot. */ | |
c9f39d2c | 278 | found = (int)i; |
3c0ef626 | 279 | break; |
280 | } | |
c9f39d2c | 281 | if (found < 0) { |
3c0ef626 | 282 | /* There are no free slots. Take last+1 slot and expand the array. */ |
283 | found = channels_alloc; | |
680cee3b | 284 | if (channels_alloc > 10000) |
285 | fatal("channel_new: internal error: channels_alloc %d " | |
286 | "too big.", channels_alloc); | |
9108f8d9 | 287 | channels = xrealloc(channels, channels_alloc + 10, |
288 | sizeof(Channel *)); | |
b51b59a5 | 289 | channels_alloc += 10; |
3c0ef626 | 290 | debug2("channel: expanding %d", channels_alloc); |
3c0ef626 | 291 | for (i = found; i < channels_alloc; i++) |
292 | channels[i] = NULL; | |
293 | } | |
294 | /* Initialize and return new channel. */ | |
9108f8d9 | 295 | c = channels[found] = xcalloc(1, sizeof(Channel)); |
3c0ef626 | 296 | buffer_init(&c->input); |
297 | buffer_init(&c->output); | |
298 | buffer_init(&c->extended); | |
91d9cdd3 | 299 | c->path = NULL; |
e9a17296 | 300 | c->ostate = CHAN_OUTPUT_OPEN; |
301 | c->istate = CHAN_INPUT_OPEN; | |
302 | c->flags = 0; | |
22616013 | 303 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock, 0); |
3c0ef626 | 304 | c->self = found; |
305 | c->type = type; | |
306 | c->ctype = ctype; | |
307 | c->local_window = window; | |
308 | c->local_window_max = window; | |
309 | c->local_consumed = 0; | |
310 | c->local_maxpacket = maxpack; | |
311 | c->remote_id = -1; | |
0fff78ff | 312 | c->remote_name = xstrdup(remote_name); |
3c0ef626 | 313 | c->remote_window = 0; |
314 | c->remote_maxpacket = 0; | |
3c0ef626 | 315 | c->force_drain = 0; |
e9a17296 | 316 | c->single_connection = 0; |
3c0ef626 | 317 | c->detach_user = NULL; |
2c06c99b | 318 | c->detach_close = 0; |
22616013 | 319 | c->open_confirm = NULL; |
320 | c->open_confirm_ctx = NULL; | |
3c0ef626 | 321 | c->input_filter = NULL; |
2c06c99b | 322 | c->output_filter = NULL; |
22616013 | 323 | c->filter_ctx = NULL; |
324 | c->filter_cleanup = NULL; | |
325 | TAILQ_INIT(&c->status_confirms); | |
3c0ef626 | 326 | debug("channel %d: new [%s]", found, remote_name); |
327 | return c; | |
328 | } | |
329 | ||
330 | static int | |
331 | channel_find_maxfd(void) | |
332 | { | |
c9f39d2c | 333 | u_int i; |
334 | int max = 0; | |
3c0ef626 | 335 | Channel *c; |
336 | ||
337 | for (i = 0; i < channels_alloc; i++) { | |
338 | c = channels[i]; | |
339 | if (c != NULL) { | |
340 | max = MAX(max, c->rfd); | |
341 | max = MAX(max, c->wfd); | |
342 | max = MAX(max, c->efd); | |
343 | } | |
344 | } | |
345 | return max; | |
346 | } | |
347 | ||
348 | int | |
349 | channel_close_fd(int *fdp) | |
350 | { | |
351 | int ret = 0, fd = *fdp; | |
352 | ||
353 | if (fd != -1) { | |
354 | ret = close(fd); | |
355 | *fdp = -1; | |
356 | if (fd == channel_max_fd) | |
357 | channel_max_fd = channel_find_maxfd(); | |
358 | } | |
359 | return ret; | |
360 | } | |
361 | ||
362 | /* Close all channel fd/socket. */ | |
3c0ef626 | 363 | static void |
364 | channel_close_fds(Channel *c) | |
365 | { | |
c9f39d2c | 366 | debug3("channel %d: close_fds r %d w %d e %d c %d", |
367 | c->self, c->rfd, c->wfd, c->efd, c->ctl_fd); | |
3c0ef626 | 368 | |
369 | channel_close_fd(&c->sock); | |
c9f39d2c | 370 | channel_close_fd(&c->ctl_fd); |
3c0ef626 | 371 | channel_close_fd(&c->rfd); |
372 | channel_close_fd(&c->wfd); | |
373 | channel_close_fd(&c->efd); | |
374 | } | |
375 | ||
376 | /* Free the channel and close its fd/socket. */ | |
3c0ef626 | 377 | void |
378 | channel_free(Channel *c) | |
379 | { | |
380 | char *s; | |
c9f39d2c | 381 | u_int i, n; |
22616013 | 382 | struct channel_confirm *cc; |
3c0ef626 | 383 | |
384 | for (n = 0, i = 0; i < channels_alloc; i++) | |
385 | if (channels[i]) | |
386 | n++; | |
c9f39d2c | 387 | debug("channel %d: free: %s, nchannels %u", c->self, |
3c0ef626 | 388 | c->remote_name ? c->remote_name : "???", n); |
389 | ||
390 | s = channel_open_message(); | |
0fff78ff | 391 | debug3("channel %d: status: %s", c->self, s); |
3c0ef626 | 392 | xfree(s); |
393 | ||
394 | if (c->sock != -1) | |
395 | shutdown(c->sock, SHUT_RDWR); | |
c9f39d2c | 396 | if (c->ctl_fd != -1) |
397 | shutdown(c->ctl_fd, SHUT_RDWR); | |
3c0ef626 | 398 | channel_close_fds(c); |
399 | buffer_free(&c->input); | |
400 | buffer_free(&c->output); | |
401 | buffer_free(&c->extended); | |
402 | if (c->remote_name) { | |
403 | xfree(c->remote_name); | |
404 | c->remote_name = NULL; | |
405 | } | |
91d9cdd3 | 406 | if (c->path) { |
407 | xfree(c->path); | |
408 | c->path = NULL; | |
409 | } | |
22616013 | 410 | while ((cc = TAILQ_FIRST(&c->status_confirms)) != NULL) { |
411 | if (cc->abandon_cb != NULL) | |
412 | cc->abandon_cb(c, cc->ctx); | |
413 | TAILQ_REMOVE(&c->status_confirms, cc, entry); | |
414 | bzero(cc, sizeof(*cc)); | |
415 | xfree(cc); | |
416 | } | |
417 | if (c->filter_cleanup != NULL && c->filter_ctx != NULL) | |
418 | c->filter_cleanup(c->self, c->filter_ctx); | |
3c0ef626 | 419 | channels[c->self] = NULL; |
420 | xfree(c); | |
421 | } | |
422 | ||
423 | void | |
424 | channel_free_all(void) | |
425 | { | |
c9f39d2c | 426 | u_int i; |
3c0ef626 | 427 | |
428 | for (i = 0; i < channels_alloc; i++) | |
429 | if (channels[i] != NULL) | |
430 | channel_free(channels[i]); | |
431 | } | |
432 | ||
433 | /* | |
434 | * Closes the sockets/fds of all channels. This is used to close extra file | |
435 | * descriptors after a fork. | |
436 | */ | |
3c0ef626 | 437 | void |
e9a17296 | 438 | channel_close_all(void) |
3c0ef626 | 439 | { |
c9f39d2c | 440 | u_int i; |
3c0ef626 | 441 | |
442 | for (i = 0; i < channels_alloc; i++) | |
443 | if (channels[i] != NULL) | |
444 | channel_close_fds(channels[i]); | |
445 | } | |
446 | ||
447 | /* | |
448 | * Stop listening to channels. | |
449 | */ | |
3c0ef626 | 450 | void |
451 | channel_stop_listening(void) | |
452 | { | |
c9f39d2c | 453 | u_int i; |
3c0ef626 | 454 | Channel *c; |
455 | ||
456 | for (i = 0; i < channels_alloc; i++) { | |
457 | c = channels[i]; | |
458 | if (c != NULL) { | |
459 | switch (c->type) { | |
460 | case SSH_CHANNEL_AUTH_SOCKET: | |
461 | case SSH_CHANNEL_PORT_LISTENER: | |
462 | case SSH_CHANNEL_RPORT_LISTENER: | |
463 | case SSH_CHANNEL_X11_LISTENER: | |
464 | channel_close_fd(&c->sock); | |
465 | channel_free(c); | |
466 | break; | |
467 | } | |
468 | } | |
469 | } | |
470 | } | |
471 | ||
472 | /* | |
473 | * Returns true if no channel has too much buffered data, and false if one or | |
474 | * more channel is overfull. | |
475 | */ | |
3c0ef626 | 476 | int |
e9a17296 | 477 | channel_not_very_much_buffered_data(void) |
3c0ef626 | 478 | { |
479 | u_int i; | |
480 | Channel *c; | |
481 | ||
482 | for (i = 0; i < channels_alloc; i++) { | |
483 | c = channels[i]; | |
484 | if (c != NULL && c->type == SSH_CHANNEL_OPEN) { | |
485 | #if 0 | |
486 | if (!compat20 && | |
487 | buffer_len(&c->input) > packet_get_maxsize()) { | |
6a9b3198 | 488 | debug2("channel %d: big input buffer %d", |
3c0ef626 | 489 | c->self, buffer_len(&c->input)); |
490 | return 0; | |
491 | } | |
492 | #endif | |
493 | if (buffer_len(&c->output) > packet_get_maxsize()) { | |
0fff78ff | 494 | debug2("channel %d: big output buffer %u > %u", |
3c0ef626 | 495 | c->self, buffer_len(&c->output), |
496 | packet_get_maxsize()); | |
497 | return 0; | |
498 | } | |
499 | } | |
500 | } | |
501 | return 1; | |
502 | } | |
503 | ||
504 | /* Returns true if any channel is still open. */ | |
3c0ef626 | 505 | int |
e9a17296 | 506 | channel_still_open(void) |
3c0ef626 | 507 | { |
c9f39d2c | 508 | u_int i; |
3c0ef626 | 509 | Channel *c; |
510 | ||
511 | for (i = 0; i < channels_alloc; i++) { | |
512 | c = channels[i]; | |
513 | if (c == NULL) | |
514 | continue; | |
515 | switch (c->type) { | |
516 | case SSH_CHANNEL_X11_LISTENER: | |
517 | case SSH_CHANNEL_PORT_LISTENER: | |
518 | case SSH_CHANNEL_RPORT_LISTENER: | |
519 | case SSH_CHANNEL_CLOSED: | |
520 | case SSH_CHANNEL_AUTH_SOCKET: | |
521 | case SSH_CHANNEL_DYNAMIC: | |
522 | case SSH_CHANNEL_CONNECTING: | |
523 | case SSH_CHANNEL_ZOMBIE: | |
524 | continue; | |
525 | case SSH_CHANNEL_LARVAL: | |
526 | if (!compat20) | |
527 | fatal("cannot happen: SSH_CHANNEL_LARVAL"); | |
528 | continue; | |
529 | case SSH_CHANNEL_OPENING: | |
530 | case SSH_CHANNEL_OPEN: | |
531 | case SSH_CHANNEL_X11_OPEN: | |
532 | return 1; | |
533 | case SSH_CHANNEL_INPUT_DRAINING: | |
534 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
535 | if (!compat13) | |
536 | fatal("cannot happen: OUT_DRAIN"); | |
537 | return 1; | |
538 | default: | |
539 | fatal("channel_still_open: bad channel type %d", c->type); | |
540 | /* NOTREACHED */ | |
541 | } | |
542 | } | |
543 | return 0; | |
544 | } | |
545 | ||
546 | /* Returns the id of an open channel suitable for keepaliving */ | |
3c0ef626 | 547 | int |
e9a17296 | 548 | channel_find_open(void) |
3c0ef626 | 549 | { |
c9f39d2c | 550 | u_int i; |
3c0ef626 | 551 | Channel *c; |
552 | ||
553 | for (i = 0; i < channels_alloc; i++) { | |
554 | c = channels[i]; | |
c9f39d2c | 555 | if (c == NULL || c->remote_id < 0) |
3c0ef626 | 556 | continue; |
557 | switch (c->type) { | |
558 | case SSH_CHANNEL_CLOSED: | |
559 | case SSH_CHANNEL_DYNAMIC: | |
560 | case SSH_CHANNEL_X11_LISTENER: | |
561 | case SSH_CHANNEL_PORT_LISTENER: | |
562 | case SSH_CHANNEL_RPORT_LISTENER: | |
563 | case SSH_CHANNEL_OPENING: | |
564 | case SSH_CHANNEL_CONNECTING: | |
565 | case SSH_CHANNEL_ZOMBIE: | |
566 | continue; | |
567 | case SSH_CHANNEL_LARVAL: | |
568 | case SSH_CHANNEL_AUTH_SOCKET: | |
569 | case SSH_CHANNEL_OPEN: | |
570 | case SSH_CHANNEL_X11_OPEN: | |
571 | return i; | |
572 | case SSH_CHANNEL_INPUT_DRAINING: | |
573 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
574 | if (!compat13) | |
575 | fatal("cannot happen: OUT_DRAIN"); | |
576 | return i; | |
577 | default: | |
578 | fatal("channel_find_open: bad channel type %d", c->type); | |
579 | /* NOTREACHED */ | |
580 | } | |
581 | } | |
582 | return -1; | |
583 | } | |
584 | ||
585 | ||
586 | /* | |
587 | * Returns a message describing the currently open forwarded connections, | |
588 | * suitable for sending to the client. The message contains crlf pairs for | |
589 | * newlines. | |
590 | */ | |
3c0ef626 | 591 | char * |
e9a17296 | 592 | channel_open_message(void) |
3c0ef626 | 593 | { |
594 | Buffer buffer; | |
595 | Channel *c; | |
596 | char buf[1024], *cp; | |
c9f39d2c | 597 | u_int i; |
3c0ef626 | 598 | |
599 | buffer_init(&buffer); | |
600 | snprintf(buf, sizeof buf, "The following connections are open:\r\n"); | |
601 | buffer_append(&buffer, buf, strlen(buf)); | |
602 | for (i = 0; i < channels_alloc; i++) { | |
603 | c = channels[i]; | |
604 | if (c == NULL) | |
605 | continue; | |
606 | switch (c->type) { | |
607 | case SSH_CHANNEL_X11_LISTENER: | |
608 | case SSH_CHANNEL_PORT_LISTENER: | |
609 | case SSH_CHANNEL_RPORT_LISTENER: | |
610 | case SSH_CHANNEL_CLOSED: | |
611 | case SSH_CHANNEL_AUTH_SOCKET: | |
612 | case SSH_CHANNEL_ZOMBIE: | |
613 | continue; | |
614 | case SSH_CHANNEL_LARVAL: | |
615 | case SSH_CHANNEL_OPENING: | |
616 | case SSH_CHANNEL_CONNECTING: | |
617 | case SSH_CHANNEL_DYNAMIC: | |
618 | case SSH_CHANNEL_OPEN: | |
619 | case SSH_CHANNEL_X11_OPEN: | |
620 | case SSH_CHANNEL_INPUT_DRAINING: | |
621 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
c9f39d2c | 622 | snprintf(buf, sizeof buf, |
623 | " #%d %.300s (t%d r%d i%d/%d o%d/%d fd %d/%d cfd %d)\r\n", | |
3c0ef626 | 624 | c->self, c->remote_name, |
625 | c->type, c->remote_id, | |
626 | c->istate, buffer_len(&c->input), | |
627 | c->ostate, buffer_len(&c->output), | |
c9f39d2c | 628 | c->rfd, c->wfd, c->ctl_fd); |
3c0ef626 | 629 | buffer_append(&buffer, buf, strlen(buf)); |
630 | continue; | |
631 | default: | |
632 | fatal("channel_open_message: bad channel type %d", c->type); | |
633 | /* NOTREACHED */ | |
634 | } | |
635 | } | |
636 | buffer_append(&buffer, "\0", 1); | |
637 | cp = xstrdup(buffer_ptr(&buffer)); | |
638 | buffer_free(&buffer); | |
639 | return cp; | |
640 | } | |
641 | ||
642 | void | |
643 | channel_send_open(int id) | |
644 | { | |
645 | Channel *c = channel_lookup(id); | |
41b2f314 | 646 | |
3c0ef626 | 647 | if (c == NULL) { |
0fff78ff | 648 | logit("channel_send_open: %d: bad id", id); |
3c0ef626 | 649 | return; |
650 | } | |
6a9b3198 | 651 | debug2("channel %d: send open", id); |
3c0ef626 | 652 | packet_start(SSH2_MSG_CHANNEL_OPEN); |
653 | packet_put_cstring(c->ctype); | |
654 | packet_put_int(c->self); | |
655 | packet_put_int(c->local_window); | |
656 | packet_put_int(c->local_maxpacket); | |
657 | packet_send(); | |
658 | } | |
659 | ||
660 | void | |
6a9b3198 | 661 | channel_request_start(int id, char *service, int wantconfirm) |
3c0ef626 | 662 | { |
6a9b3198 | 663 | Channel *c = channel_lookup(id); |
41b2f314 | 664 | |
3c0ef626 | 665 | if (c == NULL) { |
0fff78ff | 666 | logit("channel_request_start: %d: unknown channel id", id); |
3c0ef626 | 667 | return; |
668 | } | |
c9f39d2c | 669 | debug2("channel %d: request %s confirm %d", id, service, wantconfirm); |
3c0ef626 | 670 | packet_start(SSH2_MSG_CHANNEL_REQUEST); |
671 | packet_put_int(c->remote_id); | |
672 | packet_put_cstring(service); | |
673 | packet_put_char(wantconfirm); | |
674 | } | |
9108f8d9 | 675 | |
3c0ef626 | 676 | void |
22616013 | 677 | channel_register_status_confirm(int id, channel_confirm_cb *cb, |
678 | channel_confirm_abandon_cb *abandon_cb, void *ctx) | |
679 | { | |
680 | struct channel_confirm *cc; | |
681 | Channel *c; | |
682 | ||
683 | if ((c = channel_lookup(id)) == NULL) | |
684 | fatal("channel_register_expect: %d: bad id", id); | |
685 | ||
686 | cc = xmalloc(sizeof(*cc)); | |
687 | cc->cb = cb; | |
688 | cc->abandon_cb = abandon_cb; | |
689 | cc->ctx = ctx; | |
690 | TAILQ_INSERT_TAIL(&c->status_confirms, cc, entry); | |
691 | } | |
692 | ||
693 | void | |
694 | channel_register_open_confirm(int id, channel_callback_fn *fn, void *ctx) | |
3c0ef626 | 695 | { |
696 | Channel *c = channel_lookup(id); | |
41b2f314 | 697 | |
3c0ef626 | 698 | if (c == NULL) { |
91d9cdd3 | 699 | logit("channel_register_open_confirm: %d: bad id", id); |
3c0ef626 | 700 | return; |
701 | } | |
22616013 | 702 | c->open_confirm = fn; |
703 | c->open_confirm_ctx = ctx; | |
3c0ef626 | 704 | } |
9108f8d9 | 705 | |
3c0ef626 | 706 | void |
2c06c99b | 707 | channel_register_cleanup(int id, channel_callback_fn *fn, int do_close) |
3c0ef626 | 708 | { |
2c06c99b | 709 | Channel *c = channel_by_id(id); |
41b2f314 | 710 | |
3c0ef626 | 711 | if (c == NULL) { |
0fff78ff | 712 | logit("channel_register_cleanup: %d: bad id", id); |
3c0ef626 | 713 | return; |
714 | } | |
715 | c->detach_user = fn; | |
2c06c99b | 716 | c->detach_close = do_close; |
3c0ef626 | 717 | } |
9108f8d9 | 718 | |
3c0ef626 | 719 | void |
720 | channel_cancel_cleanup(int id) | |
721 | { | |
2c06c99b | 722 | Channel *c = channel_by_id(id); |
41b2f314 | 723 | |
3c0ef626 | 724 | if (c == NULL) { |
0fff78ff | 725 | logit("channel_cancel_cleanup: %d: bad id", id); |
3c0ef626 | 726 | return; |
727 | } | |
728 | c->detach_user = NULL; | |
2c06c99b | 729 | c->detach_close = 0; |
3c0ef626 | 730 | } |
9108f8d9 | 731 | |
3c0ef626 | 732 | void |
2c06c99b | 733 | channel_register_filter(int id, channel_infilter_fn *ifn, |
22616013 | 734 | channel_outfilter_fn *ofn, channel_filter_cleanup_fn *cfn, void *ctx) |
3c0ef626 | 735 | { |
736 | Channel *c = channel_lookup(id); | |
41b2f314 | 737 | |
3c0ef626 | 738 | if (c == NULL) { |
0fff78ff | 739 | logit("channel_register_filter: %d: bad id", id); |
3c0ef626 | 740 | return; |
741 | } | |
2c06c99b | 742 | c->input_filter = ifn; |
743 | c->output_filter = ofn; | |
22616013 | 744 | c->filter_ctx = ctx; |
745 | c->filter_cleanup = cfn; | |
3c0ef626 | 746 | } |
747 | ||
748 | void | |
749 | channel_set_fds(int id, int rfd, int wfd, int efd, | |
22616013 | 750 | int extusage, int nonblock, int is_tty, u_int window_max) |
3c0ef626 | 751 | { |
752 | Channel *c = channel_lookup(id); | |
41b2f314 | 753 | |
3c0ef626 | 754 | if (c == NULL || c->type != SSH_CHANNEL_LARVAL) |
755 | fatal("channel_activate for non-larval channel %d.", id); | |
22616013 | 756 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock, is_tty); |
3c0ef626 | 757 | c->type = SSH_CHANNEL_OPEN; |
e9a17296 | 758 | c->local_window = c->local_window_max = window_max; |
3c0ef626 | 759 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
760 | packet_put_int(c->remote_id); | |
761 | packet_put_int(c->local_window); | |
762 | packet_send(); | |
763 | } | |
764 | ||
765 | /* | |
766 | * 'channel_pre*' are called just before select() to add any bits relevant to | |
767 | * channels in the select bitmasks. | |
768 | */ | |
769 | /* | |
770 | * 'channel_post*': perform any appropriate operations for channels which | |
771 | * have events pending. | |
772 | */ | |
9108f8d9 | 773 | typedef void chan_fn(Channel *c, fd_set *readset, fd_set *writeset); |
3c0ef626 | 774 | chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE]; |
775 | chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE]; | |
776 | ||
9108f8d9 | 777 | /* ARGSUSED */ |
3c0ef626 | 778 | static void |
9108f8d9 | 779 | channel_pre_listener(Channel *c, fd_set *readset, fd_set *writeset) |
3c0ef626 | 780 | { |
781 | FD_SET(c->sock, readset); | |
782 | } | |
783 | ||
9108f8d9 | 784 | /* ARGSUSED */ |
3c0ef626 | 785 | static void |
9108f8d9 | 786 | channel_pre_connecting(Channel *c, fd_set *readset, fd_set *writeset) |
3c0ef626 | 787 | { |
788 | debug3("channel %d: waiting for connection", c->self); | |
789 | FD_SET(c->sock, writeset); | |
790 | } | |
791 | ||
792 | static void | |
9108f8d9 | 793 | channel_pre_open_13(Channel *c, fd_set *readset, fd_set *writeset) |
3c0ef626 | 794 | { |
795 | if (buffer_len(&c->input) < packet_get_maxsize()) | |
796 | FD_SET(c->sock, readset); | |
797 | if (buffer_len(&c->output) > 0) | |
798 | FD_SET(c->sock, writeset); | |
799 | } | |
800 | ||
801 | static void | |
9108f8d9 | 802 | channel_pre_open(Channel *c, fd_set *readset, fd_set *writeset) |
3c0ef626 | 803 | { |
e9a17296 | 804 | u_int limit = compat20 ? c->remote_window : packet_get_maxsize(); |
3c0ef626 | 805 | |
3c0ef626 | 806 | if (c->istate == CHAN_INPUT_OPEN && |
e9a17296 | 807 | limit > 0 && |
9108f8d9 | 808 | buffer_len(&c->input) < limit && |
809 | buffer_check_alloc(&c->input, CHAN_RBUF)) | |
3c0ef626 | 810 | FD_SET(c->rfd, readset); |
811 | if (c->ostate == CHAN_OUTPUT_OPEN || | |
812 | c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { | |
813 | if (buffer_len(&c->output) > 0) { | |
814 | FD_SET(c->wfd, writeset); | |
815 | } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { | |
700318f3 | 816 | if (CHANNEL_EFD_OUTPUT_ACTIVE(c)) |
665a873d | 817 | debug2("channel %d: obuf_empty delayed efd %d/(%d)", |
818 | c->self, c->efd, buffer_len(&c->extended)); | |
700318f3 | 819 | else |
820 | chan_obuf_empty(c); | |
3c0ef626 | 821 | } |
822 | } | |
823 | /** XXX check close conditions, too */ | |
22616013 | 824 | if (compat20 && c->efd != -1 && |
825 | !(c->istate == CHAN_INPUT_CLOSED && c->ostate == CHAN_OUTPUT_CLOSED)) { | |
3c0ef626 | 826 | if (c->extended_usage == CHAN_EXTENDED_WRITE && |
827 | buffer_len(&c->extended) > 0) | |
828 | FD_SET(c->efd, writeset); | |
700318f3 | 829 | else if (!(c->flags & CHAN_EOF_SENT) && |
830 | c->extended_usage == CHAN_EXTENDED_READ && | |
3c0ef626 | 831 | buffer_len(&c->extended) < c->remote_window) |
832 | FD_SET(c->efd, readset); | |
833 | } | |
c9f39d2c | 834 | /* XXX: What about efd? races? */ |
835 | if (compat20 && c->ctl_fd != -1 && | |
836 | c->istate == CHAN_INPUT_OPEN && c->ostate == CHAN_OUTPUT_OPEN) | |
837 | FD_SET(c->ctl_fd, readset); | |
3c0ef626 | 838 | } |
839 | ||
9108f8d9 | 840 | /* ARGSUSED */ |
3c0ef626 | 841 | static void |
9108f8d9 | 842 | channel_pre_input_draining(Channel *c, fd_set *readset, fd_set *writeset) |
3c0ef626 | 843 | { |
844 | if (buffer_len(&c->input) == 0) { | |
845 | packet_start(SSH_MSG_CHANNEL_CLOSE); | |
846 | packet_put_int(c->remote_id); | |
847 | packet_send(); | |
848 | c->type = SSH_CHANNEL_CLOSED; | |
0fff78ff | 849 | debug2("channel %d: closing after input drain.", c->self); |
3c0ef626 | 850 | } |
851 | } | |
852 | ||
9108f8d9 | 853 | /* ARGSUSED */ |
3c0ef626 | 854 | static void |
9108f8d9 | 855 | channel_pre_output_draining(Channel *c, fd_set *readset, fd_set *writeset) |
3c0ef626 | 856 | { |
857 | if (buffer_len(&c->output) == 0) | |
858 | chan_mark_dead(c); | |
859 | else | |
860 | FD_SET(c->sock, writeset); | |
861 | } | |
862 | ||
863 | /* | |
864 | * This is a special state for X11 authentication spoofing. An opened X11 | |
865 | * connection (when authentication spoofing is being done) remains in this | |
866 | * state until the first packet has been completely read. The authentication | |
867 | * data in that packet is then substituted by the real data if it matches the | |
868 | * fake data, and the channel is put into normal mode. | |
869 | * XXX All this happens at the client side. | |
870 | * Returns: 0 = need more data, -1 = wrong cookie, 1 = ok | |
871 | */ | |
872 | static int | |
873 | x11_open_helper(Buffer *b) | |
874 | { | |
875 | u_char *ucp; | |
876 | u_int proto_len, data_len; | |
877 | ||
878 | /* Check if the fixed size part of the packet is in buffer. */ | |
879 | if (buffer_len(b) < 12) | |
880 | return 0; | |
881 | ||
882 | /* Parse the lengths of variable-length fields. */ | |
e9a17296 | 883 | ucp = buffer_ptr(b); |
3c0ef626 | 884 | if (ucp[0] == 0x42) { /* Byte order MSB first. */ |
885 | proto_len = 256 * ucp[6] + ucp[7]; | |
886 | data_len = 256 * ucp[8] + ucp[9]; | |
887 | } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */ | |
888 | proto_len = ucp[6] + 256 * ucp[7]; | |
889 | data_len = ucp[8] + 256 * ucp[9]; | |
890 | } else { | |
0fff78ff | 891 | debug2("Initial X11 packet contains bad byte order byte: 0x%x", |
e9a17296 | 892 | ucp[0]); |
3c0ef626 | 893 | return -1; |
894 | } | |
895 | ||
896 | /* Check if the whole packet is in buffer. */ | |
897 | if (buffer_len(b) < | |
898 | 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3)) | |
899 | return 0; | |
900 | ||
901 | /* Check if authentication protocol matches. */ | |
902 | if (proto_len != strlen(x11_saved_proto) || | |
903 | memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) { | |
0fff78ff | 904 | debug2("X11 connection uses different authentication protocol."); |
3c0ef626 | 905 | return -1; |
906 | } | |
907 | /* Check if authentication data matches our fake data. */ | |
908 | if (data_len != x11_fake_data_len || | |
909 | memcmp(ucp + 12 + ((proto_len + 3) & ~3), | |
910 | x11_fake_data, x11_fake_data_len) != 0) { | |
0fff78ff | 911 | debug2("X11 auth data does not match fake data."); |
3c0ef626 | 912 | return -1; |
913 | } | |
914 | /* Check fake data length */ | |
915 | if (x11_fake_data_len != x11_saved_data_len) { | |
916 | error("X11 fake_data_len %d != saved_data_len %d", | |
917 | x11_fake_data_len, x11_saved_data_len); | |
918 | return -1; | |
919 | } | |
920 | /* | |
921 | * Received authentication protocol and data match | |
922 | * our fake data. Substitute the fake data with real | |
923 | * data. | |
924 | */ | |
925 | memcpy(ucp + 12 + ((proto_len + 3) & ~3), | |
926 | x11_saved_data, x11_saved_data_len); | |
927 | return 1; | |
928 | } | |
929 | ||
930 | static void | |
9108f8d9 | 931 | channel_pre_x11_open_13(Channel *c, fd_set *readset, fd_set *writeset) |
3c0ef626 | 932 | { |
933 | int ret = x11_open_helper(&c->output); | |
41b2f314 | 934 | |
3c0ef626 | 935 | if (ret == 1) { |
936 | /* Start normal processing for the channel. */ | |
937 | c->type = SSH_CHANNEL_OPEN; | |
938 | channel_pre_open_13(c, readset, writeset); | |
939 | } else if (ret == -1) { | |
940 | /* | |
941 | * We have received an X11 connection that has bad | |
942 | * authentication information. | |
943 | */ | |
0fff78ff | 944 | logit("X11 connection rejected because of wrong authentication."); |
3c0ef626 | 945 | buffer_clear(&c->input); |
946 | buffer_clear(&c->output); | |
947 | channel_close_fd(&c->sock); | |
948 | c->sock = -1; | |
949 | c->type = SSH_CHANNEL_CLOSED; | |
950 | packet_start(SSH_MSG_CHANNEL_CLOSE); | |
951 | packet_put_int(c->remote_id); | |
952 | packet_send(); | |
953 | } | |
954 | } | |
955 | ||
956 | static void | |
9108f8d9 | 957 | channel_pre_x11_open(Channel *c, fd_set *readset, fd_set *writeset) |
3c0ef626 | 958 | { |
959 | int ret = x11_open_helper(&c->output); | |
960 | ||
961 | /* c->force_drain = 1; */ | |
962 | ||
963 | if (ret == 1) { | |
964 | c->type = SSH_CHANNEL_OPEN; | |
e9a17296 | 965 | channel_pre_open(c, readset, writeset); |
3c0ef626 | 966 | } else if (ret == -1) { |
0fff78ff | 967 | logit("X11 connection rejected because of wrong authentication."); |
968 | debug2("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate); | |
e9a17296 | 969 | chan_read_failed(c); |
970 | buffer_clear(&c->input); | |
971 | chan_ibuf_empty(c); | |
972 | buffer_clear(&c->output); | |
973 | /* for proto v1, the peer will send an IEOF */ | |
974 | if (compat20) | |
975 | chan_write_failed(c); | |
976 | else | |
977 | c->type = SSH_CHANNEL_OPEN; | |
0fff78ff | 978 | debug2("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate); |
3c0ef626 | 979 | } |
980 | } | |
981 | ||
982 | /* try to decode a socks4 header */ | |
9108f8d9 | 983 | /* ARGSUSED */ |
3c0ef626 | 984 | static int |
9108f8d9 | 985 | channel_decode_socks4(Channel *c, fd_set *readset, fd_set *writeset) |
3c0ef626 | 986 | { |
41b2f314 | 987 | char *p, *host; |
91d9cdd3 | 988 | u_int len, have, i, found, need; |
e9a17296 | 989 | char username[256]; |
3c0ef626 | 990 | struct { |
991 | u_int8_t version; | |
992 | u_int8_t command; | |
993 | u_int16_t dest_port; | |
994 | struct in_addr dest_addr; | |
995 | } s4_req, s4_rsp; | |
996 | ||
997 | debug2("channel %d: decode socks4", c->self); | |
998 | ||
999 | have = buffer_len(&c->input); | |
1000 | len = sizeof(s4_req); | |
1001 | if (have < len) | |
1002 | return 0; | |
1003 | p = buffer_ptr(&c->input); | |
91d9cdd3 | 1004 | |
1005 | need = 1; | |
1006 | /* SOCKS4A uses an invalid IP address 0.0.0.x */ | |
1007 | if (p[4] == 0 && p[5] == 0 && p[6] == 0 && p[7] != 0) { | |
1008 | debug2("channel %d: socks4a request", c->self); | |
1009 | /* ... and needs an extra string (the hostname) */ | |
1010 | need = 2; | |
1011 | } | |
1012 | /* Check for terminating NUL on the string(s) */ | |
3c0ef626 | 1013 | for (found = 0, i = len; i < have; i++) { |
1014 | if (p[i] == '\0') { | |
91d9cdd3 | 1015 | found++; |
1016 | if (found == need) | |
1017 | break; | |
3c0ef626 | 1018 | } |
1019 | if (i > 1024) { | |
1020 | /* the peer is probably sending garbage */ | |
1021 | debug("channel %d: decode socks4: too long", | |
1022 | c->self); | |
1023 | return -1; | |
1024 | } | |
1025 | } | |
91d9cdd3 | 1026 | if (found < need) |
3c0ef626 | 1027 | return 0; |
1028 | buffer_get(&c->input, (char *)&s4_req.version, 1); | |
1029 | buffer_get(&c->input, (char *)&s4_req.command, 1); | |
1030 | buffer_get(&c->input, (char *)&s4_req.dest_port, 2); | |
1031 | buffer_get(&c->input, (char *)&s4_req.dest_addr, 4); | |
1032 | have = buffer_len(&c->input); | |
1033 | p = buffer_ptr(&c->input); | |
1034 | len = strlen(p); | |
1035 | debug2("channel %d: decode socks4: user %s/%d", c->self, p, len); | |
91d9cdd3 | 1036 | len++; /* trailing '\0' */ |
3c0ef626 | 1037 | if (len > have) |
1038 | fatal("channel %d: decode socks4: len %d > have %d", | |
1039 | c->self, len, have); | |
1040 | strlcpy(username, p, sizeof(username)); | |
1041 | buffer_consume(&c->input, len); | |
3c0ef626 | 1042 | |
91d9cdd3 | 1043 | if (c->path != NULL) { |
1044 | xfree(c->path); | |
1045 | c->path = NULL; | |
1046 | } | |
1047 | if (need == 1) { /* SOCKS4: one string */ | |
1048 | host = inet_ntoa(s4_req.dest_addr); | |
1049 | c->path = xstrdup(host); | |
1050 | } else { /* SOCKS4A: two strings */ | |
1051 | have = buffer_len(&c->input); | |
1052 | p = buffer_ptr(&c->input); | |
1053 | len = strlen(p); | |
1054 | debug2("channel %d: decode socks4a: host %s/%d", | |
1055 | c->self, p, len); | |
1056 | len++; /* trailing '\0' */ | |
1057 | if (len > have) | |
1058 | fatal("channel %d: decode socks4a: len %d > have %d", | |
1059 | c->self, len, have); | |
1060 | if (len > NI_MAXHOST) { | |
1061 | error("channel %d: hostname \"%.100s\" too long", | |
1062 | c->self, p); | |
1063 | return -1; | |
1064 | } | |
1065 | c->path = xstrdup(p); | |
1066 | buffer_consume(&c->input, len); | |
1067 | } | |
3c0ef626 | 1068 | c->host_port = ntohs(s4_req.dest_port); |
e9a17296 | 1069 | |
0fff78ff | 1070 | debug2("channel %d: dynamic request: socks4 host %s port %u command %u", |
91d9cdd3 | 1071 | c->self, c->path, c->host_port, s4_req.command); |
3c0ef626 | 1072 | |
1073 | if (s4_req.command != 1) { | |
91d9cdd3 | 1074 | debug("channel %d: cannot handle: %s cn %d", |
1075 | c->self, need == 1 ? "SOCKS4" : "SOCKS4A", s4_req.command); | |
3c0ef626 | 1076 | return -1; |
1077 | } | |
1078 | s4_rsp.version = 0; /* vn: 0 for reply */ | |
1079 | s4_rsp.command = 90; /* cd: req granted */ | |
1080 | s4_rsp.dest_port = 0; /* ignored */ | |
1081 | s4_rsp.dest_addr.s_addr = INADDR_ANY; /* ignored */ | |
9108f8d9 | 1082 | buffer_append(&c->output, &s4_rsp, sizeof(s4_rsp)); |
3c0ef626 | 1083 | return 1; |
1084 | } | |
1085 | ||
0fff78ff | 1086 | /* try to decode a socks5 header */ |
1087 | #define SSH_SOCKS5_AUTHDONE 0x1000 | |
1088 | #define SSH_SOCKS5_NOAUTH 0x00 | |
1089 | #define SSH_SOCKS5_IPV4 0x01 | |
1090 | #define SSH_SOCKS5_DOMAIN 0x03 | |
1091 | #define SSH_SOCKS5_IPV6 0x04 | |
1092 | #define SSH_SOCKS5_CONNECT 0x01 | |
1093 | #define SSH_SOCKS5_SUCCESS 0x00 | |
1094 | ||
9108f8d9 | 1095 | /* ARGSUSED */ |
0fff78ff | 1096 | static int |
9108f8d9 | 1097 | channel_decode_socks5(Channel *c, fd_set *readset, fd_set *writeset) |
0fff78ff | 1098 | { |
1099 | struct { | |
1100 | u_int8_t version; | |
1101 | u_int8_t command; | |
1102 | u_int8_t reserved; | |
1103 | u_int8_t atyp; | |
1104 | } s5_req, s5_rsp; | |
1105 | u_int16_t dest_port; | |
91d9cdd3 | 1106 | u_char *p, dest_addr[255+1], ntop[INET6_ADDRSTRLEN]; |
9108f8d9 | 1107 | u_int have, need, i, found, nmethods, addrlen, af; |
0fff78ff | 1108 | |
1109 | debug2("channel %d: decode socks5", c->self); | |
1110 | p = buffer_ptr(&c->input); | |
1111 | if (p[0] != 0x05) | |
1112 | return -1; | |
1113 | have = buffer_len(&c->input); | |
1114 | if (!(c->flags & SSH_SOCKS5_AUTHDONE)) { | |
1115 | /* format: ver | nmethods | methods */ | |
cdd66111 | 1116 | if (have < 2) |
0fff78ff | 1117 | return 0; |
1118 | nmethods = p[1]; | |
1119 | if (have < nmethods + 2) | |
1120 | return 0; | |
1121 | /* look for method: "NO AUTHENTICATION REQUIRED" */ | |
799ae497 | 1122 | for (found = 0, i = 2; i < nmethods + 2; i++) { |
9108f8d9 | 1123 | if (p[i] == SSH_SOCKS5_NOAUTH) { |
0fff78ff | 1124 | found = 1; |
1125 | break; | |
1126 | } | |
1127 | } | |
1128 | if (!found) { | |
1129 | debug("channel %d: method SSH_SOCKS5_NOAUTH not found", | |
1130 | c->self); | |
1131 | return -1; | |
1132 | } | |
1133 | buffer_consume(&c->input, nmethods + 2); | |
1134 | buffer_put_char(&c->output, 0x05); /* version */ | |
1135 | buffer_put_char(&c->output, SSH_SOCKS5_NOAUTH); /* method */ | |
1136 | FD_SET(c->sock, writeset); | |
1137 | c->flags |= SSH_SOCKS5_AUTHDONE; | |
1138 | debug2("channel %d: socks5 auth done", c->self); | |
1139 | return 0; /* need more */ | |
1140 | } | |
1141 | debug2("channel %d: socks5 post auth", c->self); | |
1142 | if (have < sizeof(s5_req)+1) | |
1143 | return 0; /* need more */ | |
9108f8d9 | 1144 | memcpy(&s5_req, p, sizeof(s5_req)); |
0fff78ff | 1145 | if (s5_req.version != 0x05 || |
1146 | s5_req.command != SSH_SOCKS5_CONNECT || | |
1147 | s5_req.reserved != 0x00) { | |
1148 | debug2("channel %d: only socks5 connect supported", c->self); | |
1149 | return -1; | |
1150 | } | |
dec6d9fe | 1151 | switch (s5_req.atyp){ |
0fff78ff | 1152 | case SSH_SOCKS5_IPV4: |
1153 | addrlen = 4; | |
1154 | af = AF_INET; | |
1155 | break; | |
1156 | case SSH_SOCKS5_DOMAIN: | |
1157 | addrlen = p[sizeof(s5_req)]; | |
1158 | af = -1; | |
1159 | break; | |
1160 | case SSH_SOCKS5_IPV6: | |
1161 | addrlen = 16; | |
1162 | af = AF_INET6; | |
1163 | break; | |
1164 | default: | |
1165 | debug2("channel %d: bad socks5 atyp %d", c->self, s5_req.atyp); | |
1166 | return -1; | |
1167 | } | |
9108f8d9 | 1168 | need = sizeof(s5_req) + addrlen + 2; |
1169 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) | |
1170 | need++; | |
1171 | if (have < need) | |
0fff78ff | 1172 | return 0; |
1173 | buffer_consume(&c->input, sizeof(s5_req)); | |
1174 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) | |
1175 | buffer_consume(&c->input, 1); /* host string length */ | |
1176 | buffer_get(&c->input, (char *)&dest_addr, addrlen); | |
1177 | buffer_get(&c->input, (char *)&dest_port, 2); | |
1178 | dest_addr[addrlen] = '\0'; | |
91d9cdd3 | 1179 | if (c->path != NULL) { |
1180 | xfree(c->path); | |
1181 | c->path = NULL; | |
1182 | } | |
1183 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) { | |
1184 | if (addrlen >= NI_MAXHOST) { | |
1185 | error("channel %d: dynamic request: socks5 hostname " | |
1186 | "\"%.100s\" too long", c->self, dest_addr); | |
1187 | return -1; | |
1188 | } | |
1189 | c->path = xstrdup(dest_addr); | |
1190 | } else { | |
1191 | if (inet_ntop(af, dest_addr, ntop, sizeof(ntop)) == NULL) | |
1192 | return -1; | |
1193 | c->path = xstrdup(ntop); | |
1194 | } | |
0fff78ff | 1195 | c->host_port = ntohs(dest_port); |
cdd66111 | 1196 | |
0fff78ff | 1197 | debug2("channel %d: dynamic request: socks5 host %s port %u command %u", |
1198 | c->self, c->path, c->host_port, s5_req.command); | |
1199 | ||
1200 | s5_rsp.version = 0x05; | |
1201 | s5_rsp.command = SSH_SOCKS5_SUCCESS; | |
1202 | s5_rsp.reserved = 0; /* ignored */ | |
1203 | s5_rsp.atyp = SSH_SOCKS5_IPV4; | |
1204 | ((struct in_addr *)&dest_addr)->s_addr = INADDR_ANY; | |
1205 | dest_port = 0; /* ignored */ | |
1206 | ||
9108f8d9 | 1207 | buffer_append(&c->output, &s5_rsp, sizeof(s5_rsp)); |
1208 | buffer_append(&c->output, &dest_addr, sizeof(struct in_addr)); | |
1209 | buffer_append(&c->output, &dest_port, sizeof(dest_port)); | |
0fff78ff | 1210 | return 1; |
1211 | } | |
1212 | ||
3c0ef626 | 1213 | /* dynamic port forwarding */ |
1214 | static void | |
9108f8d9 | 1215 | channel_pre_dynamic(Channel *c, fd_set *readset, fd_set *writeset) |
3c0ef626 | 1216 | { |
1217 | u_char *p; | |
665a873d | 1218 | u_int have; |
1219 | int ret; | |
3c0ef626 | 1220 | |
1221 | have = buffer_len(&c->input); | |
1222 | c->delayed = 0; | |
1223 | debug2("channel %d: pre_dynamic: have %d", c->self, have); | |
1224 | /* buffer_dump(&c->input); */ | |
1225 | /* check if the fixed size part of the packet is in buffer. */ | |
0fff78ff | 1226 | if (have < 3) { |
3c0ef626 | 1227 | /* need more */ |
1228 | FD_SET(c->sock, readset); | |
1229 | return; | |
1230 | } | |
1231 | /* try to guess the protocol */ | |
1232 | p = buffer_ptr(&c->input); | |
1233 | switch (p[0]) { | |
1234 | case 0x04: | |
1235 | ret = channel_decode_socks4(c, readset, writeset); | |
1236 | break; | |
0fff78ff | 1237 | case 0x05: |
1238 | ret = channel_decode_socks5(c, readset, writeset); | |
1239 | break; | |
3c0ef626 | 1240 | default: |
1241 | ret = -1; | |
1242 | break; | |
1243 | } | |
1244 | if (ret < 0) { | |
1245 | chan_mark_dead(c); | |
1246 | } else if (ret == 0) { | |
1247 | debug2("channel %d: pre_dynamic: need more", c->self); | |
1248 | /* need more */ | |
1249 | FD_SET(c->sock, readset); | |
1250 | } else { | |
1251 | /* switch to the next state */ | |
1252 | c->type = SSH_CHANNEL_OPENING; | |
1253 | port_open_helper(c, "direct-tcpip"); | |
1254 | } | |
1255 | } | |
1256 | ||
1257 | /* This is our fake X11 server socket. */ | |
9108f8d9 | 1258 | /* ARGSUSED */ |
3c0ef626 | 1259 | static void |
9108f8d9 | 1260 | channel_post_x11_listener(Channel *c, fd_set *readset, fd_set *writeset) |
3c0ef626 | 1261 | { |
1262 | Channel *nc; | |
22616013 | 1263 | struct sockaddr_storage addr; |
3c0ef626 | 1264 | int newsock; |
1265 | socklen_t addrlen; | |
1266 | char buf[16384], *remote_ipaddr; | |
1267 | int remote_port; | |
1268 | ||
1269 | if (FD_ISSET(c->sock, readset)) { | |
1270 | debug("X11 connection requested."); | |
1271 | addrlen = sizeof(addr); | |
22616013 | 1272 | newsock = accept(c->sock, (struct sockaddr *)&addr, &addrlen); |
e9a17296 | 1273 | if (c->single_connection) { |
0fff78ff | 1274 | debug2("single_connection: closing X11 listener."); |
e9a17296 | 1275 | channel_close_fd(&c->sock); |
1276 | chan_mark_dead(c); | |
1277 | } | |
3c0ef626 | 1278 | if (newsock < 0) { |
1279 | error("accept: %.100s", strerror(errno)); | |
1280 | return; | |
1281 | } | |
e9a17296 | 1282 | set_nodelay(newsock); |
3c0ef626 | 1283 | remote_ipaddr = get_peer_ipaddr(newsock); |
1284 | remote_port = get_peer_port(newsock); | |
1285 | snprintf(buf, sizeof buf, "X11 connection from %.200s port %d", | |
1286 | remote_ipaddr, remote_port); | |
1287 | ||
1288 | nc = channel_new("accepted x11 socket", | |
1289 | SSH_CHANNEL_OPENING, newsock, newsock, -1, | |
0fff78ff | 1290 | c->local_window_max, c->local_maxpacket, 0, buf, 1); |
3c0ef626 | 1291 | if (compat20) { |
1292 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1293 | packet_put_cstring("x11"); | |
1294 | packet_put_int(nc->self); | |
e9a17296 | 1295 | packet_put_int(nc->local_window_max); |
1296 | packet_put_int(nc->local_maxpacket); | |
3c0ef626 | 1297 | /* originator ipaddr and port */ |
1298 | packet_put_cstring(remote_ipaddr); | |
1299 | if (datafellows & SSH_BUG_X11FWD) { | |
0fff78ff | 1300 | debug2("ssh2 x11 bug compat mode"); |
3c0ef626 | 1301 | } else { |
1302 | packet_put_int(remote_port); | |
1303 | } | |
1304 | packet_send(); | |
1305 | } else { | |
1306 | packet_start(SSH_SMSG_X11_OPEN); | |
1307 | packet_put_int(nc->self); | |
1308 | if (packet_get_protocol_flags() & | |
1309 | SSH_PROTOFLAG_HOST_IN_FWD_OPEN) | |
1310 | packet_put_cstring(buf); | |
1311 | packet_send(); | |
1312 | } | |
1313 | xfree(remote_ipaddr); | |
1314 | } | |
1315 | } | |
1316 | ||
1317 | static void | |
1318 | port_open_helper(Channel *c, char *rtype) | |
1319 | { | |
1320 | int direct; | |
1321 | char buf[1024]; | |
1322 | char *remote_ipaddr = get_peer_ipaddr(c->sock); | |
665a873d | 1323 | int remote_port = get_peer_port(c->sock); |
3c0ef626 | 1324 | |
1325 | direct = (strcmp(rtype, "direct-tcpip") == 0); | |
1326 | ||
1327 | snprintf(buf, sizeof buf, | |
1328 | "%s: listening port %d for %.100s port %d, " | |
1329 | "connect from %.200s port %d", | |
1330 | rtype, c->listening_port, c->path, c->host_port, | |
1331 | remote_ipaddr, remote_port); | |
1332 | ||
1333 | xfree(c->remote_name); | |
1334 | c->remote_name = xstrdup(buf); | |
1335 | ||
1336 | if (compat20) { | |
1337 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1338 | packet_put_cstring(rtype); | |
1339 | packet_put_int(c->self); | |
1340 | packet_put_int(c->local_window_max); | |
1341 | packet_put_int(c->local_maxpacket); | |
1342 | if (direct) { | |
1343 | /* target host, port */ | |
1344 | packet_put_cstring(c->path); | |
1345 | packet_put_int(c->host_port); | |
1346 | } else { | |
1347 | /* listen address, port */ | |
1348 | packet_put_cstring(c->path); | |
1349 | packet_put_int(c->listening_port); | |
1350 | } | |
1351 | /* originator host and port */ | |
1352 | packet_put_cstring(remote_ipaddr); | |
665a873d | 1353 | packet_put_int((u_int)remote_port); |
3c0ef626 | 1354 | packet_send(); |
1355 | } else { | |
1356 | packet_start(SSH_MSG_PORT_OPEN); | |
1357 | packet_put_int(c->self); | |
1358 | packet_put_cstring(c->path); | |
1359 | packet_put_int(c->host_port); | |
1360 | if (packet_get_protocol_flags() & | |
1361 | SSH_PROTOFLAG_HOST_IN_FWD_OPEN) | |
1362 | packet_put_cstring(c->remote_name); | |
1363 | packet_send(); | |
1364 | } | |
1365 | xfree(remote_ipaddr); | |
1366 | } | |
1367 | ||
2c06c99b | 1368 | static void |
1369 | channel_set_reuseaddr(int fd) | |
1370 | { | |
1371 | int on = 1; | |
1372 | ||
1373 | /* | |
1374 | * Set socket options. | |
1375 | * Allow local port reuse in TIME_WAIT. | |
1376 | */ | |
1377 | if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1) | |
1378 | error("setsockopt SO_REUSEADDR fd %d: %s", fd, strerror(errno)); | |
1379 | } | |
1380 | ||
3c0ef626 | 1381 | /* |
1382 | * This socket is listening for connections to a forwarded TCP/IP port. | |
1383 | */ | |
9108f8d9 | 1384 | /* ARGSUSED */ |
3c0ef626 | 1385 | static void |
9108f8d9 | 1386 | channel_post_port_listener(Channel *c, fd_set *readset, fd_set *writeset) |
3c0ef626 | 1387 | { |
1388 | Channel *nc; | |
22616013 | 1389 | struct sockaddr_storage addr; |
3c0ef626 | 1390 | int newsock, nextstate; |
1391 | socklen_t addrlen; | |
1392 | char *rtype; | |
1393 | ||
1394 | if (FD_ISSET(c->sock, readset)) { | |
1395 | debug("Connection to port %d forwarding " | |
1396 | "to %.100s port %d requested.", | |
1397 | c->listening_port, c->path, c->host_port); | |
1398 | ||
1399 | if (c->type == SSH_CHANNEL_RPORT_LISTENER) { | |
1400 | nextstate = SSH_CHANNEL_OPENING; | |
1401 | rtype = "forwarded-tcpip"; | |
1402 | } else { | |
1403 | if (c->host_port == 0) { | |
1404 | nextstate = SSH_CHANNEL_DYNAMIC; | |
1405 | rtype = "dynamic-tcpip"; | |
1406 | } else { | |
1407 | nextstate = SSH_CHANNEL_OPENING; | |
1408 | rtype = "direct-tcpip"; | |
1409 | } | |
1410 | } | |
1411 | ||
1412 | addrlen = sizeof(addr); | |
22616013 | 1413 | newsock = accept(c->sock, (struct sockaddr *)&addr, &addrlen); |
3c0ef626 | 1414 | if (newsock < 0) { |
1415 | error("accept: %.100s", strerror(errno)); | |
1416 | return; | |
1417 | } | |
e9a17296 | 1418 | set_nodelay(newsock); |
0fff78ff | 1419 | nc = channel_new(rtype, nextstate, newsock, newsock, -1, |
1420 | c->local_window_max, c->local_maxpacket, 0, rtype, 1); | |
3c0ef626 | 1421 | nc->listening_port = c->listening_port; |
1422 | nc->host_port = c->host_port; | |
91d9cdd3 | 1423 | if (c->path != NULL) |
1424 | nc->path = xstrdup(c->path); | |
3c0ef626 | 1425 | |
1426 | if (nextstate == SSH_CHANNEL_DYNAMIC) { | |
1427 | /* | |
1428 | * do not call the channel_post handler until | |
1429 | * this flag has been reset by a pre-handler. | |
1430 | * otherwise the FD_ISSET calls might overflow | |
1431 | */ | |
1432 | nc->delayed = 1; | |
1433 | } else { | |
1434 | port_open_helper(nc, rtype); | |
1435 | } | |
1436 | } | |
1437 | } | |
1438 | ||
1439 | /* | |
1440 | * This is the authentication agent socket listening for connections from | |
1441 | * clients. | |
1442 | */ | |
9108f8d9 | 1443 | /* ARGSUSED */ |
3c0ef626 | 1444 | static void |
9108f8d9 | 1445 | channel_post_auth_listener(Channel *c, fd_set *readset, fd_set *writeset) |
3c0ef626 | 1446 | { |
1447 | Channel *nc; | |
3c0ef626 | 1448 | int newsock; |
22616013 | 1449 | struct sockaddr_storage addr; |
3c0ef626 | 1450 | socklen_t addrlen; |
1451 | ||
1452 | if (FD_ISSET(c->sock, readset)) { | |
1453 | addrlen = sizeof(addr); | |
22616013 | 1454 | newsock = accept(c->sock, (struct sockaddr *)&addr, &addrlen); |
3c0ef626 | 1455 | if (newsock < 0) { |
1456 | error("accept from auth socket: %.100s", strerror(errno)); | |
1457 | return; | |
1458 | } | |
3c0ef626 | 1459 | nc = channel_new("accepted auth socket", |
1460 | SSH_CHANNEL_OPENING, newsock, newsock, -1, | |
1461 | c->local_window_max, c->local_maxpacket, | |
0fff78ff | 1462 | 0, "accepted auth socket", 1); |
3c0ef626 | 1463 | if (compat20) { |
1464 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1465 | packet_put_cstring("auth-agent@openssh.com"); | |
1466 | packet_put_int(nc->self); | |
1467 | packet_put_int(c->local_window_max); | |
1468 | packet_put_int(c->local_maxpacket); | |
1469 | } else { | |
1470 | packet_start(SSH_SMSG_AGENT_OPEN); | |
1471 | packet_put_int(nc->self); | |
1472 | } | |
1473 | packet_send(); | |
1474 | } | |
1475 | } | |
1476 | ||
9108f8d9 | 1477 | /* ARGSUSED */ |
3c0ef626 | 1478 | static void |
9108f8d9 | 1479 | channel_post_connecting(Channel *c, fd_set *readset, fd_set *writeset) |
3c0ef626 | 1480 | { |
22616013 | 1481 | int err = 0, sock; |
3c0ef626 | 1482 | socklen_t sz = sizeof(err); |
1483 | ||
1484 | if (FD_ISSET(c->sock, writeset)) { | |
e9a17296 | 1485 | if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, &err, &sz) < 0) { |
3c0ef626 | 1486 | err = errno; |
1487 | error("getsockopt SO_ERROR failed"); | |
1488 | } | |
1489 | if (err == 0) { | |
22616013 | 1490 | debug("channel %d: connected to %s port %d", |
1491 | c->self, c->connect_ctx.host, c->connect_ctx.port); | |
1492 | channel_connect_ctx_free(&c->connect_ctx); | |
3c0ef626 | 1493 | c->type = SSH_CHANNEL_OPEN; |
1494 | if (compat20) { | |
1495 | packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1496 | packet_put_int(c->remote_id); | |
1497 | packet_put_int(c->self); | |
1498 | packet_put_int(c->local_window); | |
1499 | packet_put_int(c->local_maxpacket); | |
1500 | } else { | |
1501 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1502 | packet_put_int(c->remote_id); | |
1503 | packet_put_int(c->self); | |
1504 | } | |
1505 | } else { | |
22616013 | 1506 | debug("channel %d: connection failed: %s", |
3c0ef626 | 1507 | c->self, strerror(err)); |
22616013 | 1508 | /* Try next address, if any */ |
1509 | if ((sock = connect_next(&c->connect_ctx)) > 0) { | |
1510 | close(c->sock); | |
1511 | c->sock = c->rfd = c->wfd = sock; | |
1512 | channel_max_fd = channel_find_maxfd(); | |
1513 | return; | |
1514 | } | |
1515 | /* Exhausted all addresses */ | |
1516 | error("connect_to %.100s port %d: failed.", | |
1517 | c->connect_ctx.host, c->connect_ctx.port); | |
1518 | channel_connect_ctx_free(&c->connect_ctx); | |
3c0ef626 | 1519 | if (compat20) { |
1520 | packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); | |
1521 | packet_put_int(c->remote_id); | |
1522 | packet_put_int(SSH2_OPEN_CONNECT_FAILED); | |
1523 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { | |
1524 | packet_put_cstring(strerror(err)); | |
1525 | packet_put_cstring(""); | |
1526 | } | |
1527 | } else { | |
1528 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
1529 | packet_put_int(c->remote_id); | |
1530 | } | |
1531 | chan_mark_dead(c); | |
1532 | } | |
1533 | packet_send(); | |
1534 | } | |
1535 | } | |
1536 | ||
9108f8d9 | 1537 | /* ARGSUSED */ |
3c0ef626 | 1538 | static int |
9108f8d9 | 1539 | channel_handle_rfd(Channel *c, fd_set *readset, fd_set *writeset) |
3c0ef626 | 1540 | { |
dec6d9fe | 1541 | char buf[CHAN_RBUF]; |
d4487008 | 1542 | int len, force; |
3c0ef626 | 1543 | |
d4487008 | 1544 | force = c->isatty && c->detach_close && c->istate != CHAN_INPUT_CLOSED; |
1545 | if (c->rfd != -1 && (force || FD_ISSET(c->rfd, readset))) { | |
9108f8d9 | 1546 | errno = 0; |
3c0ef626 | 1547 | len = read(c->rfd, buf, sizeof(buf)); |
22616013 | 1548 | if (len < 0 && (errno == EINTR || |
1549 | ((errno == EAGAIN || errno == EWOULDBLOCK) && !force))) | |
3c0ef626 | 1550 | return 1; |
9108f8d9 | 1551 | #ifndef PTY_ZEROREAD |
3c0ef626 | 1552 | if (len <= 0) { |
9108f8d9 | 1553 | #else |
1554 | if ((!c->isatty && len <= 0) || | |
1555 | (c->isatty && (len < 0 || (len == 0 && errno != 0)))) { | |
1556 | #endif | |
0fff78ff | 1557 | debug2("channel %d: read<=0 rfd %d len %d", |
3c0ef626 | 1558 | c->self, c->rfd, len); |
1559 | if (c->type != SSH_CHANNEL_OPEN) { | |
0fff78ff | 1560 | debug2("channel %d: not open", c->self); |
3c0ef626 | 1561 | chan_mark_dead(c); |
1562 | return -1; | |
1563 | } else if (compat13) { | |
e9a17296 | 1564 | buffer_clear(&c->output); |
3c0ef626 | 1565 | c->type = SSH_CHANNEL_INPUT_DRAINING; |
0fff78ff | 1566 | debug2("channel %d: input draining.", c->self); |
3c0ef626 | 1567 | } else { |
1568 | chan_read_failed(c); | |
1569 | } | |
1570 | return -1; | |
1571 | } | |
e9a17296 | 1572 | if (c->input_filter != NULL) { |
3c0ef626 | 1573 | if (c->input_filter(c, buf, len) == -1) { |
0fff78ff | 1574 | debug2("channel %d: filter stops", c->self); |
3c0ef626 | 1575 | chan_read_failed(c); |
1576 | } | |
2c06c99b | 1577 | } else if (c->datagram) { |
1578 | buffer_put_string(&c->input, buf, len); | |
3c0ef626 | 1579 | } else { |
1580 | buffer_append(&c->input, buf, len); | |
1581 | } | |
1582 | } | |
1583 | return 1; | |
1584 | } | |
9108f8d9 | 1585 | |
1586 | /* ARGSUSED */ | |
3c0ef626 | 1587 | static int |
9108f8d9 | 1588 | channel_handle_wfd(Channel *c, fd_set *readset, fd_set *writeset) |
3c0ef626 | 1589 | { |
1590 | struct termios tio; | |
2c06c99b | 1591 | u_char *data = NULL, *buf; |
3c0ef626 | 1592 | u_int dlen; |
1593 | int len; | |
1594 | ||
1595 | /* Send buffered output data to the socket. */ | |
1596 | if (c->wfd != -1 && | |
1597 | FD_ISSET(c->wfd, writeset) && | |
1598 | buffer_len(&c->output) > 0) { | |
2c06c99b | 1599 | if (c->output_filter != NULL) { |
1600 | if ((buf = c->output_filter(c, &data, &dlen)) == NULL) { | |
1601 | debug2("channel %d: filter stops", c->self); | |
1602 | if (c->type != SSH_CHANNEL_OPEN) | |
1603 | chan_mark_dead(c); | |
1604 | else | |
1605 | chan_write_failed(c); | |
1606 | return -1; | |
1607 | } | |
1608 | } else if (c->datagram) { | |
1609 | buf = data = buffer_get_string(&c->output, &dlen); | |
1610 | } else { | |
1611 | buf = data = buffer_ptr(&c->output); | |
1612 | dlen = buffer_len(&c->output); | |
1613 | } | |
1614 | ||
1615 | if (c->datagram) { | |
1616 | /* ignore truncated writes, datagrams might get lost */ | |
1617 | c->local_consumed += dlen + 4; | |
1618 | len = write(c->wfd, buf, dlen); | |
1619 | xfree(data); | |
22616013 | 1620 | if (len < 0 && (errno == EINTR || errno == EAGAIN || |
1621 | errno == EWOULDBLOCK)) | |
2c06c99b | 1622 | return 1; |
1623 | if (len <= 0) { | |
1624 | if (c->type != SSH_CHANNEL_OPEN) | |
1625 | chan_mark_dead(c); | |
1626 | else | |
1627 | chan_write_failed(c); | |
1628 | return -1; | |
1629 | } | |
1630 | return 1; | |
1631 | } | |
41b2f314 | 1632 | #ifdef _AIX |
cdd66111 | 1633 | /* XXX: Later AIX versions can't push as much data to tty */ |
1634 | if (compat20 && c->wfd_isatty) | |
1635 | dlen = MIN(dlen, 8*1024); | |
41b2f314 | 1636 | #endif |
2c06c99b | 1637 | |
1638 | len = write(c->wfd, buf, dlen); | |
22616013 | 1639 | if (len < 0 && |
1640 | (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK)) | |
3c0ef626 | 1641 | return 1; |
1642 | if (len <= 0) { | |
1643 | if (c->type != SSH_CHANNEL_OPEN) { | |
0fff78ff | 1644 | debug2("channel %d: not open", c->self); |
3c0ef626 | 1645 | chan_mark_dead(c); |
1646 | return -1; | |
1647 | } else if (compat13) { | |
e9a17296 | 1648 | buffer_clear(&c->output); |
0fff78ff | 1649 | debug2("channel %d: input draining.", c->self); |
3c0ef626 | 1650 | c->type = SSH_CHANNEL_INPUT_DRAINING; |
1651 | } else { | |
1652 | chan_write_failed(c); | |
1653 | } | |
1654 | return -1; | |
1655 | } | |
3d738e65 | 1656 | #ifndef BROKEN_TCGETATTR_ICANON |
2c06c99b | 1657 | if (compat20 && c->isatty && dlen >= 1 && buf[0] != '\r') { |
3c0ef626 | 1658 | if (tcgetattr(c->wfd, &tio) == 0 && |
1659 | !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) { | |
1660 | /* | |
1661 | * Simulate echo to reduce the impact of | |
1662 | * traffic analysis. We need to match the | |
1663 | * size of a SSH2_MSG_CHANNEL_DATA message | |
2c06c99b | 1664 | * (4 byte channel id + buf) |
3c0ef626 | 1665 | */ |
1666 | packet_send_ignore(4 + len); | |
1667 | packet_send(); | |
1668 | } | |
1669 | } | |
3d738e65 | 1670 | #endif |
3c0ef626 | 1671 | buffer_consume(&c->output, len); |
1672 | if (compat20 && len > 0) { | |
1673 | c->local_consumed += len; | |
1674 | } | |
1675 | } | |
1676 | return 1; | |
1677 | } | |
9108f8d9 | 1678 | |
3c0ef626 | 1679 | static int |
9108f8d9 | 1680 | channel_handle_efd(Channel *c, fd_set *readset, fd_set *writeset) |
3c0ef626 | 1681 | { |
dec6d9fe | 1682 | char buf[CHAN_RBUF]; |
3c0ef626 | 1683 | int len; |
1684 | ||
1685 | /** XXX handle drain efd, too */ | |
1686 | if (c->efd != -1) { | |
1687 | if (c->extended_usage == CHAN_EXTENDED_WRITE && | |
1688 | FD_ISSET(c->efd, writeset) && | |
1689 | buffer_len(&c->extended) > 0) { | |
1690 | len = write(c->efd, buffer_ptr(&c->extended), | |
1691 | buffer_len(&c->extended)); | |
1692 | debug2("channel %d: written %d to efd %d", | |
1693 | c->self, len, c->efd); | |
22616013 | 1694 | if (len < 0 && (errno == EINTR || errno == EAGAIN || |
1695 | errno == EWOULDBLOCK)) | |
3c0ef626 | 1696 | return 1; |
1697 | if (len <= 0) { | |
1698 | debug2("channel %d: closing write-efd %d", | |
1699 | c->self, c->efd); | |
1700 | channel_close_fd(&c->efd); | |
1701 | } else { | |
1702 | buffer_consume(&c->extended, len); | |
1703 | c->local_consumed += len; | |
1704 | } | |
1705 | } else if (c->extended_usage == CHAN_EXTENDED_READ && | |
799ae497 | 1706 | (c->detach_close || FD_ISSET(c->efd, readset))) { |
3c0ef626 | 1707 | len = read(c->efd, buf, sizeof(buf)); |
1708 | debug2("channel %d: read %d from efd %d", | |
e9a17296 | 1709 | c->self, len, c->efd); |
22616013 | 1710 | if (len < 0 && (errno == EINTR || ((errno == EAGAIN || |
1711 | errno == EWOULDBLOCK) && !c->detach_close))) | |
3c0ef626 | 1712 | return 1; |
1713 | if (len <= 0) { | |
1714 | debug2("channel %d: closing read-efd %d", | |
1715 | c->self, c->efd); | |
1716 | channel_close_fd(&c->efd); | |
1717 | } else { | |
1718 | buffer_append(&c->extended, buf, len); | |
1719 | } | |
1720 | } | |
1721 | } | |
1722 | return 1; | |
1723 | } | |
9108f8d9 | 1724 | |
1725 | /* ARGSUSED */ | |
3c0ef626 | 1726 | static int |
9108f8d9 | 1727 | channel_handle_ctl(Channel *c, fd_set *readset, fd_set *writeset) |
c9f39d2c | 1728 | { |
1729 | char buf[16]; | |
1730 | int len; | |
1731 | ||
1732 | /* Monitor control fd to detect if the slave client exits */ | |
1733 | if (c->ctl_fd != -1 && FD_ISSET(c->ctl_fd, readset)) { | |
1734 | len = read(c->ctl_fd, buf, sizeof(buf)); | |
22616013 | 1735 | if (len < 0 && |
1736 | (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK)) | |
c9f39d2c | 1737 | return 1; |
1738 | if (len <= 0) { | |
1739 | debug2("channel %d: ctl read<=0", c->self); | |
1740 | if (c->type != SSH_CHANNEL_OPEN) { | |
1741 | debug2("channel %d: not open", c->self); | |
1742 | chan_mark_dead(c); | |
1743 | return -1; | |
1744 | } else { | |
1745 | chan_read_failed(c); | |
1746 | chan_write_failed(c); | |
1747 | } | |
1748 | return -1; | |
1749 | } else | |
1750 | fatal("%s: unexpected data on ctl fd", __func__); | |
1751 | } | |
1752 | return 1; | |
1753 | } | |
9108f8d9 | 1754 | |
c9f39d2c | 1755 | static int |
3c0ef626 | 1756 | channel_check_window(Channel *c) |
1757 | { | |
1758 | if (c->type == SSH_CHANNEL_OPEN && | |
1759 | !(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) && | |
d4487008 | 1760 | ((c->local_window_max - c->local_window > |
1761 | c->local_maxpacket*3) || | |
1762 | c->local_window < c->local_window_max/2) && | |
3c0ef626 | 1763 | c->local_consumed > 0) { |
1764 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); | |
1765 | packet_put_int(c->remote_id); | |
1766 | packet_put_int(c->local_consumed); | |
1767 | packet_send(); | |
1768 | debug2("channel %d: window %d sent adjust %d", | |
1769 | c->self, c->local_window, | |
1770 | c->local_consumed); | |
1771 | c->local_window += c->local_consumed; | |
1772 | c->local_consumed = 0; | |
1773 | } | |
1774 | return 1; | |
1775 | } | |
1776 | ||
1777 | static void | |
9108f8d9 | 1778 | channel_post_open(Channel *c, fd_set *readset, fd_set *writeset) |
3c0ef626 | 1779 | { |
1780 | if (c->delayed) | |
1781 | return; | |
1782 | channel_handle_rfd(c, readset, writeset); | |
1783 | channel_handle_wfd(c, readset, writeset); | |
e9a17296 | 1784 | if (!compat20) |
3c0ef626 | 1785 | return; |
3c0ef626 | 1786 | channel_handle_efd(c, readset, writeset); |
c9f39d2c | 1787 | channel_handle_ctl(c, readset, writeset); |
3c0ef626 | 1788 | channel_check_window(c); |
1789 | } | |
1790 | ||
9108f8d9 | 1791 | /* ARGSUSED */ |
3c0ef626 | 1792 | static void |
9108f8d9 | 1793 | channel_post_output_drain_13(Channel *c, fd_set *readset, fd_set *writeset) |
3c0ef626 | 1794 | { |
1795 | int len; | |
41b2f314 | 1796 | |
3c0ef626 | 1797 | /* Send buffered output data to the socket. */ |
1798 | if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) { | |
1799 | len = write(c->sock, buffer_ptr(&c->output), | |
1800 | buffer_len(&c->output)); | |
1801 | if (len <= 0) | |
e9a17296 | 1802 | buffer_clear(&c->output); |
3c0ef626 | 1803 | else |
1804 | buffer_consume(&c->output, len); | |
1805 | } | |
1806 | } | |
1807 | ||
1808 | static void | |
1809 | channel_handler_init_20(void) | |
1810 | { | |
e9a17296 | 1811 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open; |
3c0ef626 | 1812 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
1813 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; | |
1814 | channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener; | |
1815 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; | |
1816 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; | |
1817 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; | |
1818 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; | |
1819 | ||
e9a17296 | 1820 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
3c0ef626 | 1821 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; |
1822 | channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener; | |
1823 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; | |
1824 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; | |
1825 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; | |
e9a17296 | 1826 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
3c0ef626 | 1827 | } |
1828 | ||
1829 | static void | |
1830 | channel_handler_init_13(void) | |
1831 | { | |
1832 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13; | |
1833 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_13; | |
1834 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; | |
1835 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; | |
1836 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; | |
1837 | channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining; | |
1838 | channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining; | |
1839 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; | |
1840 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; | |
1841 | ||
e9a17296 | 1842 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
3c0ef626 | 1843 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
1844 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; | |
1845 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; | |
1846 | channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13; | |
1847 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; | |
e9a17296 | 1848 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
3c0ef626 | 1849 | } |
1850 | ||
1851 | static void | |
1852 | channel_handler_init_15(void) | |
1853 | { | |
e9a17296 | 1854 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open; |
3c0ef626 | 1855 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
1856 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; | |
1857 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; | |
1858 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; | |
1859 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; | |
1860 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; | |
1861 | ||
1862 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; | |
1863 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; | |
1864 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; | |
e9a17296 | 1865 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
3c0ef626 | 1866 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
e9a17296 | 1867 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
3c0ef626 | 1868 | } |
1869 | ||
1870 | static void | |
1871 | channel_handler_init(void) | |
1872 | { | |
1873 | int i; | |
41b2f314 | 1874 | |
e9a17296 | 1875 | for (i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) { |
3c0ef626 | 1876 | channel_pre[i] = NULL; |
1877 | channel_post[i] = NULL; | |
1878 | } | |
1879 | if (compat20) | |
1880 | channel_handler_init_20(); | |
1881 | else if (compat13) | |
1882 | channel_handler_init_13(); | |
1883 | else | |
1884 | channel_handler_init_15(); | |
1885 | } | |
1886 | ||
1887 | /* gc dead channels */ | |
1888 | static void | |
1889 | channel_garbage_collect(Channel *c) | |
1890 | { | |
1891 | if (c == NULL) | |
1892 | return; | |
1893 | if (c->detach_user != NULL) { | |
2c06c99b | 1894 | if (!chan_is_dead(c, c->detach_close)) |
3c0ef626 | 1895 | return; |
0fff78ff | 1896 | debug2("channel %d: gc: notify user", c->self); |
3c0ef626 | 1897 | c->detach_user(c->self, NULL); |
1898 | /* if we still have a callback */ | |
1899 | if (c->detach_user != NULL) | |
1900 | return; | |
0fff78ff | 1901 | debug2("channel %d: gc: user detached", c->self); |
3c0ef626 | 1902 | } |
1903 | if (!chan_is_dead(c, 1)) | |
1904 | return; | |
0fff78ff | 1905 | debug2("channel %d: garbage collecting", c->self); |
3c0ef626 | 1906 | channel_free(c); |
1907 | } | |
1908 | ||
1909 | static void | |
9108f8d9 | 1910 | channel_handler(chan_fn *ftab[], fd_set *readset, fd_set *writeset) |
3c0ef626 | 1911 | { |
1912 | static int did_init = 0; | |
c9f39d2c | 1913 | u_int i; |
3c0ef626 | 1914 | Channel *c; |
1915 | ||
1916 | if (!did_init) { | |
1917 | channel_handler_init(); | |
1918 | did_init = 1; | |
1919 | } | |
1920 | for (i = 0; i < channels_alloc; i++) { | |
1921 | c = channels[i]; | |
1922 | if (c == NULL) | |
1923 | continue; | |
1924 | if (ftab[c->type] != NULL) | |
1925 | (*ftab[c->type])(c, readset, writeset); | |
1926 | channel_garbage_collect(c); | |
1927 | } | |
1928 | } | |
1929 | ||
1930 | /* | |
1931 | * Allocate/update select bitmasks and add any bits relevant to channels in | |
1932 | * select bitmasks. | |
1933 | */ | |
1934 | void | |
1935 | channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp, | |
c9f39d2c | 1936 | u_int *nallocp, int rekeying) |
3c0ef626 | 1937 | { |
9108f8d9 | 1938 | u_int n, sz, nfdset; |
3c0ef626 | 1939 | |
1940 | n = MAX(*maxfdp, channel_max_fd); | |
1941 | ||
9108f8d9 | 1942 | nfdset = howmany(n+1, NFDBITS); |
1943 | /* Explicitly test here, because xrealloc isn't always called */ | |
1944 | if (nfdset && SIZE_T_MAX / nfdset < sizeof(fd_mask)) | |
1945 | fatal("channel_prepare_select: max_fd (%d) is too large", n); | |
1946 | sz = nfdset * sizeof(fd_mask); | |
1947 | ||
3c0ef626 | 1948 | /* perhaps check sz < nalloc/2 and shrink? */ |
1949 | if (*readsetp == NULL || sz > *nallocp) { | |
9108f8d9 | 1950 | *readsetp = xrealloc(*readsetp, nfdset, sizeof(fd_mask)); |
1951 | *writesetp = xrealloc(*writesetp, nfdset, sizeof(fd_mask)); | |
3c0ef626 | 1952 | *nallocp = sz; |
1953 | } | |
1954 | *maxfdp = n; | |
1955 | memset(*readsetp, 0, sz); | |
1956 | memset(*writesetp, 0, sz); | |
1957 | ||
1958 | if (!rekeying) | |
1959 | channel_handler(channel_pre, *readsetp, *writesetp); | |
1960 | } | |
1961 | ||
1962 | /* | |
1963 | * After select, perform any appropriate operations for channels which have | |
1964 | * events pending. | |
1965 | */ | |
1966 | void | |
9108f8d9 | 1967 | channel_after_select(fd_set *readset, fd_set *writeset) |
3c0ef626 | 1968 | { |
1969 | channel_handler(channel_post, readset, writeset); | |
1970 | } | |
1971 | ||
1972 | ||
1973 | /* If there is data to send to the connection, enqueue some of it now. */ | |
3c0ef626 | 1974 | void |
e9a17296 | 1975 | channel_output_poll(void) |
3c0ef626 | 1976 | { |
3c0ef626 | 1977 | Channel *c; |
c9f39d2c | 1978 | u_int i, len; |
3c0ef626 | 1979 | |
1980 | for (i = 0; i < channels_alloc; i++) { | |
1981 | c = channels[i]; | |
1982 | if (c == NULL) | |
1983 | continue; | |
1984 | ||
1985 | /* | |
1986 | * We are only interested in channels that can have buffered | |
1987 | * incoming data. | |
1988 | */ | |
1989 | if (compat13) { | |
1990 | if (c->type != SSH_CHANNEL_OPEN && | |
1991 | c->type != SSH_CHANNEL_INPUT_DRAINING) | |
1992 | continue; | |
1993 | } else { | |
1994 | if (c->type != SSH_CHANNEL_OPEN) | |
1995 | continue; | |
1996 | } | |
1997 | if (compat20 && | |
1998 | (c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) { | |
1999 | /* XXX is this true? */ | |
2000 | debug3("channel %d: will not send data after close", c->self); | |
2001 | continue; | |
2002 | } | |
2003 | ||
2004 | /* Get the amount of buffered data for this channel. */ | |
2005 | if ((c->istate == CHAN_INPUT_OPEN || | |
2006 | c->istate == CHAN_INPUT_WAIT_DRAIN) && | |
2007 | (len = buffer_len(&c->input)) > 0) { | |
2c06c99b | 2008 | if (c->datagram) { |
2009 | if (len > 0) { | |
2010 | u_char *data; | |
2011 | u_int dlen; | |
2012 | ||
2013 | data = buffer_get_string(&c->input, | |
2014 | &dlen); | |
2015 | packet_start(SSH2_MSG_CHANNEL_DATA); | |
2016 | packet_put_int(c->remote_id); | |
2017 | packet_put_string(data, dlen); | |
2018 | packet_send(); | |
2019 | c->remote_window -= dlen + 4; | |
2020 | xfree(data); | |
2021 | } | |
2022 | continue; | |
2023 | } | |
3c0ef626 | 2024 | /* |
2025 | * Send some data for the other side over the secure | |
2026 | * connection. | |
2027 | */ | |
2028 | if (compat20) { | |
2029 | if (len > c->remote_window) | |
2030 | len = c->remote_window; | |
2031 | if (len > c->remote_maxpacket) | |
2032 | len = c->remote_maxpacket; | |
2033 | } else { | |
2034 | if (packet_is_interactive()) { | |
2035 | if (len > 1024) | |
2036 | len = 512; | |
2037 | } else { | |
2038 | /* Keep the packets at reasonable size. */ | |
2039 | if (len > packet_get_maxsize()/2) | |
2040 | len = packet_get_maxsize()/2; | |
2041 | } | |
2042 | } | |
2043 | if (len > 0) { | |
2044 | packet_start(compat20 ? | |
2045 | SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA); | |
2046 | packet_put_int(c->remote_id); | |
2047 | packet_put_string(buffer_ptr(&c->input), len); | |
2048 | packet_send(); | |
2049 | buffer_consume(&c->input, len); | |
2050 | c->remote_window -= len; | |
2051 | } | |
2052 | } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) { | |
2053 | if (compat13) | |
2054 | fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3"); | |
2055 | /* | |
2056 | * input-buffer is empty and read-socket shutdown: | |
700318f3 | 2057 | * tell peer, that we will not send more data: send IEOF. |
2058 | * hack for extended data: delay EOF if EFD still in use. | |
3c0ef626 | 2059 | */ |
700318f3 | 2060 | if (CHANNEL_EFD_INPUT_ACTIVE(c)) |
665a873d | 2061 | debug2("channel %d: ibuf_empty delayed efd %d/(%d)", |
2062 | c->self, c->efd, buffer_len(&c->extended)); | |
700318f3 | 2063 | else |
2064 | chan_ibuf_empty(c); | |
3c0ef626 | 2065 | } |
2066 | /* Send extended data, i.e. stderr */ | |
2067 | if (compat20 && | |
700318f3 | 2068 | !(c->flags & CHAN_EOF_SENT) && |
3c0ef626 | 2069 | c->remote_window > 0 && |
2070 | (len = buffer_len(&c->extended)) > 0 && | |
2071 | c->extended_usage == CHAN_EXTENDED_READ) { | |
680cee3b | 2072 | debug2("channel %d: rwin %u elen %u euse %d", |
3c0ef626 | 2073 | c->self, c->remote_window, buffer_len(&c->extended), |
2074 | c->extended_usage); | |
2075 | if (len > c->remote_window) | |
2076 | len = c->remote_window; | |
2077 | if (len > c->remote_maxpacket) | |
2078 | len = c->remote_maxpacket; | |
2079 | packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA); | |
2080 | packet_put_int(c->remote_id); | |
2081 | packet_put_int(SSH2_EXTENDED_DATA_STDERR); | |
2082 | packet_put_string(buffer_ptr(&c->extended), len); | |
2083 | packet_send(); | |
2084 | buffer_consume(&c->extended, len); | |
2085 | c->remote_window -= len; | |
2086 | debug2("channel %d: sent ext data %d", c->self, len); | |
2087 | } | |
2088 | } | |
2089 | } | |
2090 | ||
2091 | ||
2092 | /* -- protocol input */ | |
2093 | ||
9108f8d9 | 2094 | /* ARGSUSED */ |
3c0ef626 | 2095 | void |
e9a17296 | 2096 | channel_input_data(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 2097 | { |
2098 | int id; | |
2099 | char *data; | |
2100 | u_int data_len; | |
2101 | Channel *c; | |
2102 | ||
2103 | /* Get the channel number and verify it. */ | |
2104 | id = packet_get_int(); | |
2105 | c = channel_lookup(id); | |
2106 | if (c == NULL) | |
2107 | packet_disconnect("Received data for nonexistent channel %d.", id); | |
2108 | ||
2109 | /* Ignore any data for non-open channels (might happen on close) */ | |
2110 | if (c->type != SSH_CHANNEL_OPEN && | |
2111 | c->type != SSH_CHANNEL_X11_OPEN) | |
2112 | return; | |
2113 | ||
3c0ef626 | 2114 | /* Get the data. */ |
22616013 | 2115 | data = packet_get_string_ptr(&data_len); |
3c0ef626 | 2116 | |
cdd66111 | 2117 | /* |
2118 | * Ignore data for protocol > 1.3 if output end is no longer open. | |
2119 | * For protocol 2 the sending side is reducing its window as it sends | |
2120 | * data, so we must 'fake' consumption of the data in order to ensure | |
2121 | * that window updates are sent back. Otherwise the connection might | |
2122 | * deadlock. | |
2123 | */ | |
2124 | if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN) { | |
2125 | if (compat20) { | |
2126 | c->local_window -= data_len; | |
2127 | c->local_consumed += data_len; | |
2128 | } | |
cdd66111 | 2129 | return; |
2130 | } | |
2131 | ||
e9a17296 | 2132 | if (compat20) { |
3c0ef626 | 2133 | if (data_len > c->local_maxpacket) { |
0fff78ff | 2134 | logit("channel %d: rcvd big packet %d, maxpack %d", |
3c0ef626 | 2135 | c->self, data_len, c->local_maxpacket); |
2136 | } | |
2137 | if (data_len > c->local_window) { | |
0fff78ff | 2138 | logit("channel %d: rcvd too much data %d, win %d", |
3c0ef626 | 2139 | c->self, data_len, c->local_window); |
3c0ef626 | 2140 | return; |
2141 | } | |
2142 | c->local_window -= data_len; | |
3c0ef626 | 2143 | } |
2c06c99b | 2144 | if (c->datagram) |
2145 | buffer_put_string(&c->output, data, data_len); | |
2146 | else | |
2147 | buffer_append(&c->output, data, data_len); | |
22616013 | 2148 | packet_check_eom(); |
3c0ef626 | 2149 | } |
2150 | ||
9108f8d9 | 2151 | /* ARGSUSED */ |
3c0ef626 | 2152 | void |
e9a17296 | 2153 | channel_input_extended_data(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 2154 | { |
2155 | int id; | |
3c0ef626 | 2156 | char *data; |
680cee3b | 2157 | u_int data_len, tcode; |
3c0ef626 | 2158 | Channel *c; |
2159 | ||
2160 | /* Get the channel number and verify it. */ | |
2161 | id = packet_get_int(); | |
2162 | c = channel_lookup(id); | |
2163 | ||
2164 | if (c == NULL) | |
2165 | packet_disconnect("Received extended_data for bad channel %d.", id); | |
2166 | if (c->type != SSH_CHANNEL_OPEN) { | |
0fff78ff | 2167 | logit("channel %d: ext data for non open", id); |
3c0ef626 | 2168 | return; |
2169 | } | |
700318f3 | 2170 | if (c->flags & CHAN_EOF_RCVD) { |
2171 | if (datafellows & SSH_BUG_EXTEOF) | |
2172 | debug("channel %d: accepting ext data after eof", id); | |
2173 | else | |
2174 | packet_disconnect("Received extended_data after EOF " | |
2175 | "on channel %d.", id); | |
2176 | } | |
3c0ef626 | 2177 | tcode = packet_get_int(); |
2178 | if (c->efd == -1 || | |
2179 | c->extended_usage != CHAN_EXTENDED_WRITE || | |
2180 | tcode != SSH2_EXTENDED_DATA_STDERR) { | |
0fff78ff | 2181 | logit("channel %d: bad ext data", c->self); |
3c0ef626 | 2182 | return; |
2183 | } | |
2184 | data = packet_get_string(&data_len); | |
e9a17296 | 2185 | packet_check_eom(); |
3c0ef626 | 2186 | if (data_len > c->local_window) { |
0fff78ff | 2187 | logit("channel %d: rcvd too much extended_data %d, win %d", |
3c0ef626 | 2188 | c->self, data_len, c->local_window); |
2189 | xfree(data); | |
2190 | return; | |
2191 | } | |
2192 | debug2("channel %d: rcvd ext data %d", c->self, data_len); | |
2193 | c->local_window -= data_len; | |
2194 | buffer_append(&c->extended, data, data_len); | |
2195 | xfree(data); | |
2196 | } | |
2197 | ||
9108f8d9 | 2198 | /* ARGSUSED */ |
3c0ef626 | 2199 | void |
e9a17296 | 2200 | channel_input_ieof(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 2201 | { |
2202 | int id; | |
2203 | Channel *c; | |
2204 | ||
3c0ef626 | 2205 | id = packet_get_int(); |
e9a17296 | 2206 | packet_check_eom(); |
3c0ef626 | 2207 | c = channel_lookup(id); |
2208 | if (c == NULL) | |
2209 | packet_disconnect("Received ieof for nonexistent channel %d.", id); | |
2210 | chan_rcvd_ieof(c); | |
2211 | ||
2212 | /* XXX force input close */ | |
e9a17296 | 2213 | if (c->force_drain && c->istate == CHAN_INPUT_OPEN) { |
3c0ef626 | 2214 | debug("channel %d: FORCE input drain", c->self); |
2215 | c->istate = CHAN_INPUT_WAIT_DRAIN; | |
e9a17296 | 2216 | if (buffer_len(&c->input) == 0) |
2217 | chan_ibuf_empty(c); | |
3c0ef626 | 2218 | } |
2219 | ||
2220 | } | |
2221 | ||
9108f8d9 | 2222 | /* ARGSUSED */ |
3c0ef626 | 2223 | void |
e9a17296 | 2224 | channel_input_close(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 2225 | { |
2226 | int id; | |
2227 | Channel *c; | |
2228 | ||
3c0ef626 | 2229 | id = packet_get_int(); |
e9a17296 | 2230 | packet_check_eom(); |
3c0ef626 | 2231 | c = channel_lookup(id); |
2232 | if (c == NULL) | |
2233 | packet_disconnect("Received close for nonexistent channel %d.", id); | |
2234 | ||
2235 | /* | |
2236 | * Send a confirmation that we have closed the channel and no more | |
2237 | * data is coming for it. | |
2238 | */ | |
2239 | packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION); | |
2240 | packet_put_int(c->remote_id); | |
2241 | packet_send(); | |
2242 | ||
2243 | /* | |
2244 | * If the channel is in closed state, we have sent a close request, | |
2245 | * and the other side will eventually respond with a confirmation. | |
2246 | * Thus, we cannot free the channel here, because then there would be | |
2247 | * no-one to receive the confirmation. The channel gets freed when | |
2248 | * the confirmation arrives. | |
2249 | */ | |
2250 | if (c->type != SSH_CHANNEL_CLOSED) { | |
2251 | /* | |
2252 | * Not a closed channel - mark it as draining, which will | |
2253 | * cause it to be freed later. | |
2254 | */ | |
e9a17296 | 2255 | buffer_clear(&c->input); |
3c0ef626 | 2256 | c->type = SSH_CHANNEL_OUTPUT_DRAINING; |
2257 | } | |
2258 | } | |
2259 | ||
2260 | /* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */ | |
9108f8d9 | 2261 | /* ARGSUSED */ |
3c0ef626 | 2262 | void |
e9a17296 | 2263 | channel_input_oclose(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 2264 | { |
2265 | int id = packet_get_int(); | |
2266 | Channel *c = channel_lookup(id); | |
e9a17296 | 2267 | |
2268 | packet_check_eom(); | |
3c0ef626 | 2269 | if (c == NULL) |
2270 | packet_disconnect("Received oclose for nonexistent channel %d.", id); | |
2271 | chan_rcvd_oclose(c); | |
2272 | } | |
2273 | ||
9108f8d9 | 2274 | /* ARGSUSED */ |
3c0ef626 | 2275 | void |
e9a17296 | 2276 | channel_input_close_confirmation(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 2277 | { |
2278 | int id = packet_get_int(); | |
2279 | Channel *c = channel_lookup(id); | |
2280 | ||
e9a17296 | 2281 | packet_check_eom(); |
3c0ef626 | 2282 | if (c == NULL) |
2283 | packet_disconnect("Received close confirmation for " | |
2284 | "out-of-range channel %d.", id); | |
2285 | if (c->type != SSH_CHANNEL_CLOSED) | |
2286 | packet_disconnect("Received close confirmation for " | |
2287 | "non-closed channel %d (type %d).", id, c->type); | |
2288 | channel_free(c); | |
2289 | } | |
2290 | ||
9108f8d9 | 2291 | /* ARGSUSED */ |
3c0ef626 | 2292 | void |
e9a17296 | 2293 | channel_input_open_confirmation(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 2294 | { |
2295 | int id, remote_id; | |
2296 | Channel *c; | |
2297 | ||
3c0ef626 | 2298 | id = packet_get_int(); |
2299 | c = channel_lookup(id); | |
2300 | ||
2301 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) | |
2302 | packet_disconnect("Received open confirmation for " | |
2303 | "non-opening channel %d.", id); | |
2304 | remote_id = packet_get_int(); | |
2305 | /* Record the remote channel number and mark that the channel is now open. */ | |
2306 | c->remote_id = remote_id; | |
2307 | c->type = SSH_CHANNEL_OPEN; | |
2308 | ||
2309 | if (compat20) { | |
2310 | c->remote_window = packet_get_int(); | |
2311 | c->remote_maxpacket = packet_get_int(); | |
22616013 | 2312 | if (c->open_confirm) { |
3c0ef626 | 2313 | debug2("callback start"); |
22616013 | 2314 | c->open_confirm(c->self, c->open_confirm_ctx); |
3c0ef626 | 2315 | debug2("callback done"); |
2316 | } | |
0fff78ff | 2317 | debug2("channel %d: open confirm rwindow %u rmax %u", c->self, |
3c0ef626 | 2318 | c->remote_window, c->remote_maxpacket); |
2319 | } | |
e9a17296 | 2320 | packet_check_eom(); |
3c0ef626 | 2321 | } |
2322 | ||
2323 | static char * | |
2324 | reason2txt(int reason) | |
2325 | { | |
e9a17296 | 2326 | switch (reason) { |
3c0ef626 | 2327 | case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED: |
2328 | return "administratively prohibited"; | |
2329 | case SSH2_OPEN_CONNECT_FAILED: | |
2330 | return "connect failed"; | |
2331 | case SSH2_OPEN_UNKNOWN_CHANNEL_TYPE: | |
2332 | return "unknown channel type"; | |
2333 | case SSH2_OPEN_RESOURCE_SHORTAGE: | |
2334 | return "resource shortage"; | |
2335 | } | |
2336 | return "unknown reason"; | |
2337 | } | |
2338 | ||
9108f8d9 | 2339 | /* ARGSUSED */ |
3c0ef626 | 2340 | void |
e9a17296 | 2341 | channel_input_open_failure(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 2342 | { |
2343 | int id, reason; | |
2344 | char *msg = NULL, *lang = NULL; | |
2345 | Channel *c; | |
2346 | ||
3c0ef626 | 2347 | id = packet_get_int(); |
2348 | c = channel_lookup(id); | |
2349 | ||
2350 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) | |
2351 | packet_disconnect("Received open failure for " | |
2352 | "non-opening channel %d.", id); | |
2353 | if (compat20) { | |
2354 | reason = packet_get_int(); | |
2355 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { | |
2356 | msg = packet_get_string(NULL); | |
2357 | lang = packet_get_string(NULL); | |
2358 | } | |
0fff78ff | 2359 | logit("channel %d: open failed: %s%s%s", id, |
3c0ef626 | 2360 | reason2txt(reason), msg ? ": ": "", msg ? msg : ""); |
2361 | if (msg != NULL) | |
2362 | xfree(msg); | |
2363 | if (lang != NULL) | |
2364 | xfree(lang); | |
2365 | } | |
e9a17296 | 2366 | packet_check_eom(); |
91d9cdd3 | 2367 | /* Schedule the channel for cleanup/deletion. */ |
2368 | chan_mark_dead(c); | |
3c0ef626 | 2369 | } |
2370 | ||
9108f8d9 | 2371 | /* ARGSUSED */ |
3c0ef626 | 2372 | void |
e9a17296 | 2373 | channel_input_window_adjust(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 2374 | { |
2375 | Channel *c; | |
680cee3b | 2376 | int id; |
2377 | u_int adjust; | |
3c0ef626 | 2378 | |
2379 | if (!compat20) | |
2380 | return; | |
2381 | ||
2382 | /* Get the channel number and verify it. */ | |
2383 | id = packet_get_int(); | |
2384 | c = channel_lookup(id); | |
2385 | ||
2c06c99b | 2386 | if (c == NULL) { |
2387 | logit("Received window adjust for non-open channel %d.", id); | |
3c0ef626 | 2388 | return; |
2389 | } | |
2390 | adjust = packet_get_int(); | |
e9a17296 | 2391 | packet_check_eom(); |
680cee3b | 2392 | debug2("channel %d: rcvd adjust %u", id, adjust); |
3c0ef626 | 2393 | c->remote_window += adjust; |
2394 | } | |
2395 | ||
9108f8d9 | 2396 | /* ARGSUSED */ |
3c0ef626 | 2397 | void |
e9a17296 | 2398 | channel_input_port_open(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 2399 | { |
2400 | Channel *c = NULL; | |
2401 | u_short host_port; | |
2402 | char *host, *originator_string; | |
22616013 | 2403 | int remote_id; |
3c0ef626 | 2404 | |
2405 | remote_id = packet_get_int(); | |
2406 | host = packet_get_string(NULL); | |
2407 | host_port = packet_get_int(); | |
2408 | ||
2409 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) { | |
2410 | originator_string = packet_get_string(NULL); | |
2411 | } else { | |
2412 | originator_string = xstrdup("unknown (remote did not supply name)"); | |
2413 | } | |
e9a17296 | 2414 | packet_check_eom(); |
22616013 | 2415 | c = channel_connect_to(host, host_port, |
2416 | "connected socket", originator_string); | |
0fff78ff | 2417 | xfree(originator_string); |
22616013 | 2418 | xfree(host); |
3c0ef626 | 2419 | if (c == NULL) { |
2420 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
2421 | packet_put_int(remote_id); | |
2422 | packet_send(); | |
22616013 | 2423 | } else |
2424 | c->remote_id = remote_id; | |
3c0ef626 | 2425 | } |
2426 | ||
22616013 | 2427 | /* ARGSUSED */ |
2428 | void | |
2429 | channel_input_status_confirm(int type, u_int32_t seq, void *ctxt) | |
2430 | { | |
2431 | Channel *c; | |
2432 | struct channel_confirm *cc; | |
91d9cdd3 | 2433 | int id; |
22616013 | 2434 | |
2435 | /* Reset keepalive timeout */ | |
3d738e65 | 2436 | packet_set_alive_timeouts(0); |
22616013 | 2437 | |
91d9cdd3 | 2438 | id = packet_get_int(); |
22616013 | 2439 | packet_check_eom(); |
2440 | ||
91d9cdd3 | 2441 | debug2("channel_input_status_confirm: type %d id %d", type, id); |
22616013 | 2442 | |
91d9cdd3 | 2443 | if ((c = channel_lookup(id)) == NULL) { |
2444 | logit("channel_input_status_confirm: %d: unknown", id); | |
22616013 | 2445 | return; |
2446 | } | |
2447 | ; | |
2448 | if ((cc = TAILQ_FIRST(&c->status_confirms)) == NULL) | |
2449 | return; | |
2450 | cc->cb(type, c, cc->ctx); | |
2451 | TAILQ_REMOVE(&c->status_confirms, cc, entry); | |
2452 | bzero(cc, sizeof(*cc)); | |
2453 | xfree(cc); | |
2454 | } | |
3c0ef626 | 2455 | |
2456 | /* -- tcp forwarding */ | |
2457 | ||
2458 | void | |
2459 | channel_set_af(int af) | |
2460 | { | |
2461 | IPv4or6 = af; | |
2462 | } | |
2463 | ||
e9a17296 | 2464 | static int |
91d9cdd3 | 2465 | channel_setup_fwd_listener(int type, const char *listen_addr, |
2466 | u_short listen_port, int *allocated_listen_port, | |
e9a17296 | 2467 | const char *host_to_connect, u_short port_to_connect, int gateway_ports) |
3c0ef626 | 2468 | { |
2469 | Channel *c; | |
2c06c99b | 2470 | int sock, r, success = 0, wildcard = 0, is_client; |
3c0ef626 | 2471 | struct addrinfo hints, *ai, *aitop; |
996d5e62 | 2472 | const char *host, *addr; |
e9a17296 | 2473 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
91d9cdd3 | 2474 | in_port_t *lport_p; |
3c0ef626 | 2475 | |
e9a17296 | 2476 | host = (type == SSH_CHANNEL_RPORT_LISTENER) ? |
2477 | listen_addr : host_to_connect; | |
996d5e62 | 2478 | is_client = (type == SSH_CHANNEL_PORT_LISTENER); |
3c0ef626 | 2479 | |
e9a17296 | 2480 | if (host == NULL) { |
2481 | error("No forward host name."); | |
665a873d | 2482 | return 0; |
3c0ef626 | 2483 | } |
91d9cdd3 | 2484 | if (strlen(host) >= NI_MAXHOST) { |
3c0ef626 | 2485 | error("Forward host name too long."); |
665a873d | 2486 | return 0; |
3c0ef626 | 2487 | } |
2488 | ||
996d5e62 | 2489 | /* |
2490 | * Determine whether or not a port forward listens to loopback, | |
dec6d9fe | 2491 | * specified address or wildcard. On the client, a specified bind |
2492 | * address will always override gateway_ports. On the server, a | |
2493 | * gateway_ports of 1 (``yes'') will override the client's | |
2494 | * specification and force a wildcard bind, whereas a value of 2 | |
2495 | * (``clientspecified'') will bind to whatever address the client | |
996d5e62 | 2496 | * asked for. |
2497 | * | |
2498 | * Special-case listen_addrs are: | |
2499 | * | |
2500 | * "0.0.0.0" -> wildcard v4/v6 if SSH_OLD_FORWARD_ADDR | |
2501 | * "" (empty string), "*" -> wildcard v4/v6 | |
2502 | * "localhost" -> loopback v4/v6 | |
2503 | */ | |
2504 | addr = NULL; | |
2505 | if (listen_addr == NULL) { | |
2506 | /* No address specified: default to gateway_ports setting */ | |
2507 | if (gateway_ports) | |
2508 | wildcard = 1; | |
2509 | } else if (gateway_ports || is_client) { | |
2510 | if (((datafellows & SSH_OLD_FORWARD_ADDR) && | |
47686178 | 2511 | strcmp(listen_addr, "0.0.0.0") == 0 && is_client == 0) || |
996d5e62 | 2512 | *listen_addr == '\0' || strcmp(listen_addr, "*") == 0 || |
2513 | (!is_client && gateway_ports == 1)) | |
2514 | wildcard = 1; | |
2515 | else if (strcmp(listen_addr, "localhost") != 0) | |
2516 | addr = listen_addr; | |
2517 | } | |
2518 | ||
2519 | debug3("channel_setup_fwd_listener: type %d wildcard %d addr %s", | |
2520 | type, wildcard, (addr == NULL) ? "NULL" : addr); | |
2521 | ||
3c0ef626 | 2522 | /* |
2523 | * getaddrinfo returns a loopback address if the hostname is | |
2524 | * set to NULL and hints.ai_flags is not AI_PASSIVE | |
2525 | */ | |
2526 | memset(&hints, 0, sizeof(hints)); | |
2527 | hints.ai_family = IPv4or6; | |
996d5e62 | 2528 | hints.ai_flags = wildcard ? AI_PASSIVE : 0; |
3c0ef626 | 2529 | hints.ai_socktype = SOCK_STREAM; |
2530 | snprintf(strport, sizeof strport, "%d", listen_port); | |
996d5e62 | 2531 | if ((r = getaddrinfo(addr, strport, &hints, &aitop)) != 0) { |
2532 | if (addr == NULL) { | |
2533 | /* This really shouldn't happen */ | |
2534 | packet_disconnect("getaddrinfo: fatal error: %s", | |
47686178 | 2535 | ssh_gai_strerror(r)); |
996d5e62 | 2536 | } else { |
665a873d | 2537 | error("channel_setup_fwd_listener: " |
47686178 | 2538 | "getaddrinfo(%.64s): %s", addr, |
2539 | ssh_gai_strerror(r)); | |
996d5e62 | 2540 | } |
665a873d | 2541 | return 0; |
996d5e62 | 2542 | } |
91d9cdd3 | 2543 | if (allocated_listen_port != NULL) |
2544 | *allocated_listen_port = 0; | |
3c0ef626 | 2545 | for (ai = aitop; ai; ai = ai->ai_next) { |
91d9cdd3 | 2546 | switch (ai->ai_family) { |
2547 | case AF_INET: | |
2548 | lport_p = &((struct sockaddr_in *)ai->ai_addr)-> | |
2549 | sin_port; | |
2550 | break; | |
2551 | case AF_INET6: | |
2552 | lport_p = &((struct sockaddr_in6 *)ai->ai_addr)-> | |
2553 | sin6_port; | |
2554 | break; | |
2555 | default: | |
3c0ef626 | 2556 | continue; |
91d9cdd3 | 2557 | } |
2558 | /* | |
2559 | * If allocating a port for -R forwards, then use the | |
2560 | * same port for all address families. | |
2561 | */ | |
2562 | if (type == SSH_CHANNEL_RPORT_LISTENER && listen_port == 0 && | |
2563 | allocated_listen_port != NULL && *allocated_listen_port > 0) | |
2564 | *lport_p = htons(*allocated_listen_port); | |
2565 | ||
3c0ef626 | 2566 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), |
2567 | strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { | |
e9a17296 | 2568 | error("channel_setup_fwd_listener: getnameinfo failed"); |
3c0ef626 | 2569 | continue; |
2570 | } | |
2571 | /* Create a port to listen for the host. */ | |
0fff78ff | 2572 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
3c0ef626 | 2573 | if (sock < 0) { |
2574 | /* this is no error since kernel may not support ipv6 */ | |
2575 | verbose("socket: %.100s", strerror(errno)); | |
2576 | continue; | |
2577 | } | |
2c06c99b | 2578 | |
2579 | channel_set_reuseaddr(sock); | |
41b2f314 | 2580 | |
91d9cdd3 | 2581 | debug("Local forwarding listening on %s port %s.", |
2582 | ntop, strport); | |
3c0ef626 | 2583 | |
2584 | /* Bind the socket to the address. */ | |
2585 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { | |
2586 | /* address can be in use ipv6 address is already bound */ | |
2587 | if (!ai->ai_next) | |
2588 | error("bind: %.100s", strerror(errno)); | |
2589 | else | |
2590 | verbose("bind: %.100s", strerror(errno)); | |
2591 | ||
2592 | close(sock); | |
2593 | continue; | |
2594 | } | |
2595 | /* Start listening for connections on the socket. */ | |
cdd66111 | 2596 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { |
3c0ef626 | 2597 | error("listen: %.100s", strerror(errno)); |
2598 | close(sock); | |
2599 | continue; | |
2600 | } | |
91d9cdd3 | 2601 | |
2602 | /* | |
2603 | * listen_port == 0 requests a dynamically allocated port - | |
2604 | * record what we got. | |
2605 | */ | |
2606 | if (type == SSH_CHANNEL_RPORT_LISTENER && listen_port == 0 && | |
2607 | allocated_listen_port != NULL && | |
2608 | *allocated_listen_port == 0) { | |
2609 | *allocated_listen_port = get_sock_port(sock, 1); | |
2610 | debug("Allocated listen port %d", | |
2611 | *allocated_listen_port); | |
2612 | } | |
2613 | ||
3c0ef626 | 2614 | /* Allocate a channel number for the socket. */ |
2615 | c = channel_new("port listener", type, sock, sock, -1, | |
2616 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, | |
0fff78ff | 2617 | 0, "port listener", 1); |
91d9cdd3 | 2618 | c->path = xstrdup(host); |
3c0ef626 | 2619 | c->host_port = port_to_connect; |
2620 | c->listening_port = listen_port; | |
2621 | success = 1; | |
2622 | } | |
2623 | if (success == 0) | |
e9a17296 | 2624 | error("channel_setup_fwd_listener: cannot listen to port: %d", |
3c0ef626 | 2625 | listen_port); |
2626 | freeaddrinfo(aitop); | |
2627 | return success; | |
2628 | } | |
2629 | ||
c9f39d2c | 2630 | int |
2631 | channel_cancel_rport_listener(const char *host, u_short port) | |
2632 | { | |
2633 | u_int i; | |
2634 | int found = 0; | |
2635 | ||
dec6d9fe | 2636 | for (i = 0; i < channels_alloc; i++) { |
c9f39d2c | 2637 | Channel *c = channels[i]; |
2638 | ||
2639 | if (c != NULL && c->type == SSH_CHANNEL_RPORT_LISTENER && | |
91d9cdd3 | 2640 | strcmp(c->path, host) == 0 && c->listening_port == port) { |
996d5e62 | 2641 | debug2("%s: close channel %d", __func__, i); |
c9f39d2c | 2642 | channel_free(c); |
2643 | found = 1; | |
2644 | } | |
2645 | } | |
2646 | ||
2647 | return (found); | |
2648 | } | |
2649 | ||
e9a17296 | 2650 | /* protocol local port fwd, used by ssh (and sshd in v1) */ |
2651 | int | |
996d5e62 | 2652 | channel_setup_local_fwd_listener(const char *listen_host, u_short listen_port, |
e9a17296 | 2653 | const char *host_to_connect, u_short port_to_connect, int gateway_ports) |
2654 | { | |
2655 | return channel_setup_fwd_listener(SSH_CHANNEL_PORT_LISTENER, | |
91d9cdd3 | 2656 | listen_host, listen_port, NULL, host_to_connect, port_to_connect, |
996d5e62 | 2657 | gateway_ports); |
e9a17296 | 2658 | } |
2659 | ||
2660 | /* protocol v2 remote port fwd, used by sshd */ | |
2661 | int | |
2662 | channel_setup_remote_fwd_listener(const char *listen_address, | |
91d9cdd3 | 2663 | u_short listen_port, int *allocated_listen_port, int gateway_ports) |
e9a17296 | 2664 | { |
2665 | return channel_setup_fwd_listener(SSH_CHANNEL_RPORT_LISTENER, | |
91d9cdd3 | 2666 | listen_address, listen_port, allocated_listen_port, |
2667 | NULL, 0, gateway_ports); | |
e9a17296 | 2668 | } |
2669 | ||
3c0ef626 | 2670 | /* |
2671 | * Initiate forwarding of connections to port "port" on remote host through | |
2672 | * the secure channel to host:port from local side. | |
2673 | */ | |
2674 | ||
9108f8d9 | 2675 | int |
996d5e62 | 2676 | channel_request_remote_forwarding(const char *listen_host, u_short listen_port, |
3c0ef626 | 2677 | const char *host_to_connect, u_short port_to_connect) |
2678 | { | |
e9a17296 | 2679 | int type, success = 0; |
3c0ef626 | 2680 | |
2681 | /* Record locally that connection to this host/port is permitted. */ | |
2682 | if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
2683 | fatal("channel_request_remote_forwarding: too many forwards"); | |
2684 | ||
2685 | /* Send the forward request to the remote side. */ | |
2686 | if (compat20) { | |
996d5e62 | 2687 | const char *address_to_bind; |
799ae497 | 2688 | if (listen_host == NULL) { |
2689 | if (datafellows & SSH_BUG_RFWD_ADDR) | |
2690 | address_to_bind = "127.0.0.1"; | |
2691 | else | |
2692 | address_to_bind = "localhost"; | |
2693 | } else if (*listen_host == '\0' || | |
2694 | strcmp(listen_host, "*") == 0) { | |
2695 | if (datafellows & SSH_BUG_RFWD_ADDR) | |
2696 | address_to_bind = "0.0.0.0"; | |
2697 | else | |
2698 | address_to_bind = ""; | |
2699 | } else | |
996d5e62 | 2700 | address_to_bind = listen_host; |
2701 | ||
3c0ef626 | 2702 | packet_start(SSH2_MSG_GLOBAL_REQUEST); |
2703 | packet_put_cstring("tcpip-forward"); | |
700318f3 | 2704 | packet_put_char(1); /* boolean: want reply */ |
3c0ef626 | 2705 | packet_put_cstring(address_to_bind); |
2706 | packet_put_int(listen_port); | |
2707 | packet_send(); | |
2708 | packet_write_wait(); | |
2709 | /* Assume that server accepts the request */ | |
2710 | success = 1; | |
2711 | } else { | |
2712 | packet_start(SSH_CMSG_PORT_FORWARD_REQUEST); | |
2713 | packet_put_int(listen_port); | |
2714 | packet_put_cstring(host_to_connect); | |
2715 | packet_put_int(port_to_connect); | |
2716 | packet_send(); | |
2717 | packet_write_wait(); | |
2718 | ||
2719 | /* Wait for response from the remote side. */ | |
e9a17296 | 2720 | type = packet_read(); |
3c0ef626 | 2721 | switch (type) { |
2722 | case SSH_SMSG_SUCCESS: | |
2723 | success = 1; | |
2724 | break; | |
2725 | case SSH_SMSG_FAILURE: | |
3c0ef626 | 2726 | break; |
2727 | default: | |
2728 | /* Unknown packet */ | |
2729 | packet_disconnect("Protocol error for port forward request:" | |
2730 | "received packet type %d.", type); | |
2731 | } | |
2732 | } | |
2733 | if (success) { | |
2734 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host_to_connect); | |
2735 | permitted_opens[num_permitted_opens].port_to_connect = port_to_connect; | |
2736 | permitted_opens[num_permitted_opens].listen_port = listen_port; | |
2737 | num_permitted_opens++; | |
2738 | } | |
9108f8d9 | 2739 | return (success ? 0 : -1); |
3c0ef626 | 2740 | } |
2741 | ||
c9f39d2c | 2742 | /* |
2743 | * Request cancellation of remote forwarding of connection host:port from | |
2744 | * local side. | |
2745 | */ | |
2746 | void | |
996d5e62 | 2747 | channel_request_rforward_cancel(const char *host, u_short port) |
c9f39d2c | 2748 | { |
2749 | int i; | |
c9f39d2c | 2750 | |
2751 | if (!compat20) | |
2752 | return; | |
2753 | ||
2754 | for (i = 0; i < num_permitted_opens; i++) { | |
2755 | if (permitted_opens[i].host_to_connect != NULL && | |
2756 | permitted_opens[i].listen_port == port) | |
2757 | break; | |
2758 | } | |
2759 | if (i >= num_permitted_opens) { | |
2760 | debug("%s: requested forward not found", __func__); | |
2761 | return; | |
2762 | } | |
2763 | packet_start(SSH2_MSG_GLOBAL_REQUEST); | |
2764 | packet_put_cstring("cancel-tcpip-forward"); | |
2765 | packet_put_char(0); | |
996d5e62 | 2766 | packet_put_cstring(host == NULL ? "" : host); |
c9f39d2c | 2767 | packet_put_int(port); |
2768 | packet_send(); | |
2769 | ||
2770 | permitted_opens[i].listen_port = 0; | |
2771 | permitted_opens[i].port_to_connect = 0; | |
2c06c99b | 2772 | xfree(permitted_opens[i].host_to_connect); |
c9f39d2c | 2773 | permitted_opens[i].host_to_connect = NULL; |
2774 | } | |
2775 | ||
3c0ef626 | 2776 | /* |
2777 | * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates | |
2778 | * listening for the port, and sends back a success reply (or disconnect | |
9108f8d9 | 2779 | * message if there was an error). |
3c0ef626 | 2780 | */ |
9108f8d9 | 2781 | int |
3c0ef626 | 2782 | channel_input_port_forward_request(int is_root, int gateway_ports) |
2783 | { | |
2784 | u_short port, host_port; | |
9108f8d9 | 2785 | int success = 0; |
3c0ef626 | 2786 | char *hostname; |
2787 | ||
2788 | /* Get arguments from the packet. */ | |
2789 | port = packet_get_int(); | |
2790 | hostname = packet_get_string(NULL); | |
2791 | host_port = packet_get_int(); | |
2792 | ||
2793 | #ifndef HAVE_CYGWIN | |
2794 | /* | |
2795 | * Check that an unprivileged user is not trying to forward a | |
2796 | * privileged port. | |
2797 | */ | |
2798 | if (port < IPPORT_RESERVED && !is_root) | |
0fff78ff | 2799 | packet_disconnect( |
2800 | "Requested forwarding of port %d but user is not root.", | |
2801 | port); | |
2802 | if (host_port == 0) | |
2803 | packet_disconnect("Dynamic forwarding denied."); | |
3c0ef626 | 2804 | #endif |
0fff78ff | 2805 | |
3c0ef626 | 2806 | /* Initiate forwarding */ |
9108f8d9 | 2807 | success = channel_setup_local_fwd_listener(NULL, port, hostname, |
996d5e62 | 2808 | host_port, gateway_ports); |
3c0ef626 | 2809 | |
2810 | /* Free the argument string. */ | |
2811 | xfree(hostname); | |
9108f8d9 | 2812 | |
2813 | return (success ? 0 : -1); | |
3c0ef626 | 2814 | } |
2815 | ||
2816 | /* | |
2817 | * Permits opening to any host/port if permitted_opens[] is empty. This is | |
2818 | * usually called by the server, because the user could connect to any port | |
2819 | * anyway, and the server has no way to know but to trust the client anyway. | |
2820 | */ | |
2821 | void | |
e9a17296 | 2822 | channel_permit_all_opens(void) |
3c0ef626 | 2823 | { |
2824 | if (num_permitted_opens == 0) | |
2825 | all_opens_permitted = 1; | |
2826 | } | |
2827 | ||
2828 | void | |
2829 | channel_add_permitted_opens(char *host, int port) | |
2830 | { | |
2831 | if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
9108f8d9 | 2832 | fatal("channel_add_permitted_opens: too many forwards"); |
3c0ef626 | 2833 | debug("allow port forwarding to host %s port %d", host, port); |
2834 | ||
2835 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host); | |
2836 | permitted_opens[num_permitted_opens].port_to_connect = port; | |
2837 | num_permitted_opens++; | |
2838 | ||
2839 | all_opens_permitted = 0; | |
2840 | } | |
2841 | ||
9108f8d9 | 2842 | int |
2843 | channel_add_adm_permitted_opens(char *host, int port) | |
2844 | { | |
2845 | if (num_adm_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
2846 | fatal("channel_add_adm_permitted_opens: too many forwards"); | |
2847 | debug("config allows port forwarding to host %s port %d", host, port); | |
2848 | ||
2849 | permitted_adm_opens[num_adm_permitted_opens].host_to_connect | |
2850 | = xstrdup(host); | |
2851 | permitted_adm_opens[num_adm_permitted_opens].port_to_connect = port; | |
2852 | return ++num_adm_permitted_opens; | |
2853 | } | |
2854 | ||
3c0ef626 | 2855 | void |
2856 | channel_clear_permitted_opens(void) | |
2857 | { | |
2858 | int i; | |
2859 | ||
2860 | for (i = 0; i < num_permitted_opens; i++) | |
c9f39d2c | 2861 | if (permitted_opens[i].host_to_connect != NULL) |
2862 | xfree(permitted_opens[i].host_to_connect); | |
3c0ef626 | 2863 | num_permitted_opens = 0; |
3c0ef626 | 2864 | } |
2865 | ||
9108f8d9 | 2866 | void |
2867 | channel_clear_adm_permitted_opens(void) | |
2868 | { | |
2869 | int i; | |
2870 | ||
2871 | for (i = 0; i < num_adm_permitted_opens; i++) | |
2872 | if (permitted_adm_opens[i].host_to_connect != NULL) | |
2873 | xfree(permitted_adm_opens[i].host_to_connect); | |
2874 | num_adm_permitted_opens = 0; | |
2875 | } | |
3c0ef626 | 2876 | |
22616013 | 2877 | void |
2878 | channel_print_adm_permitted_opens(void) | |
2879 | { | |
2880 | int i; | |
2881 | ||
91d9cdd3 | 2882 | printf("permitopen"); |
2883 | if (num_adm_permitted_opens == 0) { | |
2884 | printf(" any\n"); | |
2885 | return; | |
2886 | } | |
22616013 | 2887 | for (i = 0; i < num_adm_permitted_opens; i++) |
2888 | if (permitted_adm_opens[i].host_to_connect != NULL) | |
2889 | printf(" %s:%d", permitted_adm_opens[i].host_to_connect, | |
2890 | permitted_adm_opens[i].port_to_connect); | |
91d9cdd3 | 2891 | printf("\n"); |
22616013 | 2892 | } |
2893 | ||
2894 | /* Try to start non-blocking connect to next host in cctx list */ | |
3c0ef626 | 2895 | static int |
22616013 | 2896 | connect_next(struct channel_connect *cctx) |
3c0ef626 | 2897 | { |
22616013 | 2898 | int sock, saved_errno; |
3c0ef626 | 2899 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
3c0ef626 | 2900 | |
22616013 | 2901 | for (; cctx->ai; cctx->ai = cctx->ai->ai_next) { |
2902 | if (cctx->ai->ai_family != AF_INET && | |
2903 | cctx->ai->ai_family != AF_INET6) | |
3c0ef626 | 2904 | continue; |
22616013 | 2905 | if (getnameinfo(cctx->ai->ai_addr, cctx->ai->ai_addrlen, |
2906 | ntop, sizeof(ntop), strport, sizeof(strport), | |
2907 | NI_NUMERICHOST|NI_NUMERICSERV) != 0) { | |
2908 | error("connect_next: getnameinfo failed"); | |
3c0ef626 | 2909 | continue; |
2910 | } | |
22616013 | 2911 | if ((sock = socket(cctx->ai->ai_family, cctx->ai->ai_socktype, |
2912 | cctx->ai->ai_protocol)) == -1) { | |
2913 | if (cctx->ai->ai_next == NULL) | |
6a9b3198 | 2914 | error("socket: %.100s", strerror(errno)); |
2915 | else | |
2916 | verbose("socket: %.100s", strerror(errno)); | |
3c0ef626 | 2917 | continue; |
2918 | } | |
c9f39d2c | 2919 | if (set_nonblock(sock) == -1) |
2920 | fatal("%s: set_nonblock(%d)", __func__, sock); | |
22616013 | 2921 | if (connect(sock, cctx->ai->ai_addr, |
2922 | cctx->ai->ai_addrlen) == -1 && errno != EINPROGRESS) { | |
2923 | debug("connect_next: host %.100s ([%.100s]:%s): " | |
2924 | "%.100s", cctx->host, ntop, strport, | |
3c0ef626 | 2925 | strerror(errno)); |
22616013 | 2926 | saved_errno = errno; |
3c0ef626 | 2927 | close(sock); |
22616013 | 2928 | errno = saved_errno; |
3c0ef626 | 2929 | continue; /* fail -- try next */ |
2930 | } | |
22616013 | 2931 | debug("connect_next: host %.100s ([%.100s]:%s) " |
2932 | "in progress, fd=%d", cctx->host, ntop, strport, sock); | |
2933 | cctx->ai = cctx->ai->ai_next; | |
2934 | set_nodelay(sock); | |
2935 | return sock; | |
2936 | } | |
2937 | return -1; | |
2938 | } | |
3c0ef626 | 2939 | |
22616013 | 2940 | static void |
2941 | channel_connect_ctx_free(struct channel_connect *cctx) | |
2942 | { | |
2943 | xfree(cctx->host); | |
2944 | if (cctx->aitop) | |
2945 | freeaddrinfo(cctx->aitop); | |
2946 | bzero(cctx, sizeof(*cctx)); | |
2947 | cctx->host = NULL; | |
2948 | cctx->ai = cctx->aitop = NULL; | |
2949 | } | |
2950 | ||
2951 | /* Return CONNECTING channel to remote host, port */ | |
2952 | static Channel * | |
2953 | connect_to(const char *host, u_short port, char *ctype, char *rname) | |
2954 | { | |
2955 | struct addrinfo hints; | |
2956 | int gaierr; | |
2957 | int sock = -1; | |
2958 | char strport[NI_MAXSERV]; | |
2959 | struct channel_connect cctx; | |
2960 | Channel *c; | |
2961 | ||
2962 | memset(&cctx, 0, sizeof(cctx)); | |
2963 | memset(&hints, 0, sizeof(hints)); | |
2964 | hints.ai_family = IPv4or6; | |
2965 | hints.ai_socktype = SOCK_STREAM; | |
2966 | snprintf(strport, sizeof strport, "%d", port); | |
2967 | if ((gaierr = getaddrinfo(host, strport, &hints, &cctx.aitop)) != 0) { | |
2968 | error("connect_to %.100s: unknown host (%s)", host, | |
2969 | ssh_gai_strerror(gaierr)); | |
2970 | return NULL; | |
3c0ef626 | 2971 | } |
22616013 | 2972 | |
2973 | cctx.host = xstrdup(host); | |
2974 | cctx.port = port; | |
2975 | cctx.ai = cctx.aitop; | |
2976 | ||
2977 | if ((sock = connect_next(&cctx)) == -1) { | |
2978 | error("connect to %.100s port %d failed: %s", | |
2979 | host, port, strerror(errno)); | |
2980 | channel_connect_ctx_free(&cctx); | |
2981 | return NULL; | |
3c0ef626 | 2982 | } |
22616013 | 2983 | c = channel_new(ctype, SSH_CHANNEL_CONNECTING, sock, sock, -1, |
2984 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, rname, 1); | |
2985 | c->connect_ctx = cctx; | |
2986 | return c; | |
3c0ef626 | 2987 | } |
2988 | ||
22616013 | 2989 | Channel * |
2990 | channel_connect_by_listen_address(u_short listen_port, char *ctype, char *rname) | |
3c0ef626 | 2991 | { |
2992 | int i; | |
2993 | ||
22616013 | 2994 | for (i = 0; i < num_permitted_opens; i++) { |
c9f39d2c | 2995 | if (permitted_opens[i].host_to_connect != NULL && |
22616013 | 2996 | permitted_opens[i].listen_port == listen_port) { |
3c0ef626 | 2997 | return connect_to( |
2998 | permitted_opens[i].host_to_connect, | |
22616013 | 2999 | permitted_opens[i].port_to_connect, ctype, rname); |
3000 | } | |
3001 | } | |
3c0ef626 | 3002 | error("WARNING: Server requests forwarding for unknown listen_port %d", |
3003 | listen_port); | |
22616013 | 3004 | return NULL; |
3c0ef626 | 3005 | } |
3006 | ||
3007 | /* Check if connecting to that port is permitted and connect. */ | |
22616013 | 3008 | Channel * |
3009 | channel_connect_to(const char *host, u_short port, char *ctype, char *rname) | |
3c0ef626 | 3010 | { |
9108f8d9 | 3011 | int i, permit, permit_adm = 1; |
3c0ef626 | 3012 | |
3013 | permit = all_opens_permitted; | |
3014 | if (!permit) { | |
3015 | for (i = 0; i < num_permitted_opens; i++) | |
c9f39d2c | 3016 | if (permitted_opens[i].host_to_connect != NULL && |
3017 | permitted_opens[i].port_to_connect == port && | |
3c0ef626 | 3018 | strcmp(permitted_opens[i].host_to_connect, host) == 0) |
3019 | permit = 1; | |
9108f8d9 | 3020 | } |
3c0ef626 | 3021 | |
9108f8d9 | 3022 | if (num_adm_permitted_opens > 0) { |
3023 | permit_adm = 0; | |
3024 | for (i = 0; i < num_adm_permitted_opens; i++) | |
3025 | if (permitted_adm_opens[i].host_to_connect != NULL && | |
3026 | permitted_adm_opens[i].port_to_connect == port && | |
3027 | strcmp(permitted_adm_opens[i].host_to_connect, host) | |
3028 | == 0) | |
3029 | permit_adm = 1; | |
3c0ef626 | 3030 | } |
9108f8d9 | 3031 | |
3032 | if (!permit || !permit_adm) { | |
0fff78ff | 3033 | logit("Received request to connect to host %.100s port %d, " |
3c0ef626 | 3034 | "but the request was denied.", host, port); |
22616013 | 3035 | return NULL; |
3c0ef626 | 3036 | } |
22616013 | 3037 | return connect_to(host, port, ctype, rname); |
3c0ef626 | 3038 | } |
3039 | ||
c9f39d2c | 3040 | void |
3041 | channel_send_window_changes(void) | |
3042 | { | |
3043 | u_int i; | |
3044 | struct winsize ws; | |
3045 | ||
3046 | for (i = 0; i < channels_alloc; i++) { | |
dec6d9fe | 3047 | if (channels[i] == NULL || !channels[i]->client_tty || |
c9f39d2c | 3048 | channels[i]->type != SSH_CHANNEL_OPEN) |
3049 | continue; | |
3050 | if (ioctl(channels[i]->rfd, TIOCGWINSZ, &ws) < 0) | |
3051 | continue; | |
3052 | channel_request_start(i, "window-change", 0); | |
9108f8d9 | 3053 | packet_put_int((u_int)ws.ws_col); |
3054 | packet_put_int((u_int)ws.ws_row); | |
3055 | packet_put_int((u_int)ws.ws_xpixel); | |
3056 | packet_put_int((u_int)ws.ws_ypixel); | |
c9f39d2c | 3057 | packet_send(); |
3058 | } | |
3059 | } | |
3060 | ||
3c0ef626 | 3061 | /* -- X11 forwarding */ |
3062 | ||
3063 | /* | |
3064 | * Creates an internet domain socket for listening for X11 connections. | |
680cee3b | 3065 | * Returns 0 and a suitable display number for the DISPLAY variable |
3066 | * stored in display_numberp , or -1 if an error occurs. | |
3c0ef626 | 3067 | */ |
e9a17296 | 3068 | int |
3069 | x11_create_display_inet(int x11_display_offset, int x11_use_localhost, | |
665a873d | 3070 | int single_connection, u_int *display_numberp, int **chanids) |
3c0ef626 | 3071 | { |
e9a17296 | 3072 | Channel *nc = NULL; |
3c0ef626 | 3073 | int display_number, sock; |
3074 | u_short port; | |
3075 | struct addrinfo hints, *ai, *aitop; | |
3076 | char strport[NI_MAXSERV]; | |
3077 | int gaierr, n, num_socks = 0, socks[NUM_SOCKS]; | |
3c0ef626 | 3078 | |
2c06c99b | 3079 | if (chanids == NULL) |
3080 | return -1; | |
3081 | ||
3c0ef626 | 3082 | for (display_number = x11_display_offset; |
e9a17296 | 3083 | display_number < MAX_DISPLAYS; |
3084 | display_number++) { | |
3c0ef626 | 3085 | port = 6000 + display_number; |
3086 | memset(&hints, 0, sizeof(hints)); | |
3087 | hints.ai_family = IPv4or6; | |
e9a17296 | 3088 | hints.ai_flags = x11_use_localhost ? 0: AI_PASSIVE; |
3c0ef626 | 3089 | hints.ai_socktype = SOCK_STREAM; |
3090 | snprintf(strport, sizeof strport, "%d", port); | |
3091 | if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) { | |
47686178 | 3092 | error("getaddrinfo: %.100s", ssh_gai_strerror(gaierr)); |
e9a17296 | 3093 | return -1; |
3c0ef626 | 3094 | } |
3095 | for (ai = aitop; ai; ai = ai->ai_next) { | |
3096 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
3097 | continue; | |
0fff78ff | 3098 | sock = socket(ai->ai_family, ai->ai_socktype, |
3099 | ai->ai_protocol); | |
3c0ef626 | 3100 | if (sock < 0) { |
3101 | if ((errno != EINVAL) && (errno != EAFNOSUPPORT)) { | |
3102 | error("socket: %.100s", strerror(errno)); | |
c9f39d2c | 3103 | freeaddrinfo(aitop); |
e9a17296 | 3104 | return -1; |
3c0ef626 | 3105 | } else { |
3106 | debug("x11_create_display_inet: Socket family %d not supported", | |
3107 | ai->ai_family); | |
3108 | continue; | |
3109 | } | |
3110 | } | |
f5799ae1 | 3111 | #ifdef IPV6_V6ONLY |
3112 | if (ai->ai_family == AF_INET6) { | |
3113 | int on = 1; | |
3114 | if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) < 0) | |
3115 | error("setsockopt IPV6_V6ONLY: %.100s", strerror(errno)); | |
3116 | } | |
3117 | #endif | |
22616013 | 3118 | if (x11_use_localhost) |
3119 | channel_set_reuseaddr(sock); | |
3c0ef626 | 3120 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { |
0fff78ff | 3121 | debug2("bind port %d: %.100s", port, strerror(errno)); |
3c0ef626 | 3122 | close(sock); |
3123 | ||
3c0ef626 | 3124 | for (n = 0; n < num_socks; n++) { |
3c0ef626 | 3125 | close(socks[n]); |
3126 | } | |
3127 | num_socks = 0; | |
3128 | break; | |
3129 | } | |
3130 | socks[num_socks++] = sock; | |
3c0ef626 | 3131 | if (num_socks == NUM_SOCKS) |
3132 | break; | |
3c0ef626 | 3133 | } |
3134 | freeaddrinfo(aitop); | |
3135 | if (num_socks > 0) | |
3136 | break; | |
3137 | } | |
3138 | if (display_number >= MAX_DISPLAYS) { | |
3139 | error("Failed to allocate internet-domain X11 display socket."); | |
e9a17296 | 3140 | return -1; |
3c0ef626 | 3141 | } |
3142 | /* Start listening for connections on the socket. */ | |
3143 | for (n = 0; n < num_socks; n++) { | |
3144 | sock = socks[n]; | |
cdd66111 | 3145 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { |
3c0ef626 | 3146 | error("listen: %.100s", strerror(errno)); |
3c0ef626 | 3147 | close(sock); |
e9a17296 | 3148 | return -1; |
3c0ef626 | 3149 | } |
3c0ef626 | 3150 | } |
3c0ef626 | 3151 | |
3152 | /* Allocate a channel for each socket. */ | |
9108f8d9 | 3153 | *chanids = xcalloc(num_socks + 1, sizeof(**chanids)); |
3c0ef626 | 3154 | for (n = 0; n < num_socks; n++) { |
3155 | sock = socks[n]; | |
e9a17296 | 3156 | nc = channel_new("x11 listener", |
3c0ef626 | 3157 | SSH_CHANNEL_X11_LISTENER, sock, sock, -1, |
3158 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, | |
0fff78ff | 3159 | 0, "X11 inet listener", 1); |
e9a17296 | 3160 | nc->single_connection = single_connection; |
2c06c99b | 3161 | (*chanids)[n] = nc->self; |
3c0ef626 | 3162 | } |
2c06c99b | 3163 | (*chanids)[n] = -1; |
3c0ef626 | 3164 | |
e9a17296 | 3165 | /* Return the display number for the DISPLAY environment variable. */ |
680cee3b | 3166 | *display_numberp = display_number; |
3167 | return (0); | |
3c0ef626 | 3168 | } |
3169 | ||
3c0ef626 | 3170 | static int |
91d9cdd3 | 3171 | connect_local_xsocket_path(const char *pathname) |
3c0ef626 | 3172 | { |
3c0ef626 | 3173 | int sock; |
3174 | struct sockaddr_un addr; | |
3c0ef626 | 3175 | |
e9a17296 | 3176 | sock = socket(AF_UNIX, SOCK_STREAM, 0); |
3177 | if (sock < 0) | |
3178 | error("socket: %.100s", strerror(errno)); | |
3179 | memset(&addr, 0, sizeof(addr)); | |
3180 | addr.sun_family = AF_UNIX; | |
91d9cdd3 | 3181 | strlcpy(addr.sun_path, pathname, sizeof addr.sun_path); |
9108f8d9 | 3182 | if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) == 0) |
e9a17296 | 3183 | return sock; |
3184 | close(sock); | |
3c0ef626 | 3185 | error("connect %.100s: %.100s", addr.sun_path, strerror(errno)); |
3186 | return -1; | |
3187 | } | |
3188 | ||
91d9cdd3 | 3189 | static int |
3190 | connect_local_xsocket(u_int dnr) | |
3191 | { | |
3192 | char buf[1024]; | |
3193 | snprintf(buf, sizeof buf, _PATH_UNIX_X, dnr); | |
3194 | return connect_local_xsocket_path(buf); | |
3195 | } | |
3196 | ||
3c0ef626 | 3197 | int |
3198 | x11_connect_display(void) | |
3199 | { | |
9108f8d9 | 3200 | u_int display_number; |
3c0ef626 | 3201 | const char *display; |
3202 | char buf[1024], *cp; | |
3203 | struct addrinfo hints, *ai, *aitop; | |
3204 | char strport[NI_MAXSERV]; | |
9108f8d9 | 3205 | int gaierr, sock = 0; |
3c0ef626 | 3206 | |
3207 | /* Try to open a socket for the local X server. */ | |
3208 | display = getenv("DISPLAY"); | |
3209 | if (!display) { | |
3210 | error("DISPLAY not set."); | |
3211 | return -1; | |
3212 | } | |
3213 | /* | |
3214 | * Now we decode the value of the DISPLAY variable and make a | |
3215 | * connection to the real X server. | |
3216 | */ | |
3217 | ||
91d9cdd3 | 3218 | /* Check if the display is from launchd. */ |
3219 | #ifdef __APPLE__ | |
3220 | if (strncmp(display, "/tmp/launch", 11) == 0) { | |
3221 | sock = connect_local_xsocket_path(display); | |
3222 | if (sock < 0) | |
3223 | return -1; | |
3224 | ||
3225 | /* OK, we now have a connection to the display. */ | |
3226 | return sock; | |
3227 | } | |
3228 | #endif | |
3c0ef626 | 3229 | /* |
3230 | * Check if it is a unix domain socket. Unix domain displays are in | |
3231 | * one of the following formats: unix:d[.s], :d[.s], ::d[.s] | |
3232 | */ | |
3233 | if (strncmp(display, "unix:", 5) == 0 || | |
3234 | display[0] == ':') { | |
3235 | /* Connect to the unix domain socket. */ | |
9108f8d9 | 3236 | if (sscanf(strrchr(display, ':') + 1, "%u", &display_number) != 1) { |
3c0ef626 | 3237 | error("Could not parse display number from DISPLAY: %.100s", |
e9a17296 | 3238 | display); |
3c0ef626 | 3239 | return -1; |
3240 | } | |
3241 | /* Create a socket. */ | |
3242 | sock = connect_local_xsocket(display_number); | |
3243 | if (sock < 0) | |
3244 | return -1; | |
3245 | ||
3246 | /* OK, we now have a connection to the display. */ | |
3247 | return sock; | |
3248 | } | |
3249 | /* | |
3250 | * Connect to an inet socket. The DISPLAY value is supposedly | |
3251 | * hostname:d[.s], where hostname may also be numeric IP address. | |
3252 | */ | |
e9a17296 | 3253 | strlcpy(buf, display, sizeof(buf)); |
3c0ef626 | 3254 | cp = strchr(buf, ':'); |
3255 | if (!cp) { | |
3256 | error("Could not find ':' in DISPLAY: %.100s", display); | |
3257 | return -1; | |
3258 | } | |
3259 | *cp = 0; | |
3260 | /* buf now contains the host name. But first we parse the display number. */ | |
9108f8d9 | 3261 | if (sscanf(cp + 1, "%u", &display_number) != 1) { |
3c0ef626 | 3262 | error("Could not parse display number from DISPLAY: %.100s", |
e9a17296 | 3263 | display); |
3c0ef626 | 3264 | return -1; |
3265 | } | |
3266 | ||
3267 | /* Look up the host address */ | |
3268 | memset(&hints, 0, sizeof(hints)); | |
3269 | hints.ai_family = IPv4or6; | |
3270 | hints.ai_socktype = SOCK_STREAM; | |
9108f8d9 | 3271 | snprintf(strport, sizeof strport, "%u", 6000 + display_number); |
3c0ef626 | 3272 | if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) { |
47686178 | 3273 | error("%.100s: unknown host. (%s)", buf, |
3274 | ssh_gai_strerror(gaierr)); | |
3c0ef626 | 3275 | return -1; |
3276 | } | |
3277 | for (ai = aitop; ai; ai = ai->ai_next) { | |
3278 | /* Create a socket. */ | |
0fff78ff | 3279 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
3c0ef626 | 3280 | if (sock < 0) { |
0fff78ff | 3281 | debug2("socket: %.100s", strerror(errno)); |
3c0ef626 | 3282 | continue; |
3283 | } | |
3284 | /* Connect it to the display. */ | |
3285 | if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) { | |
9108f8d9 | 3286 | debug2("connect %.100s port %u: %.100s", buf, |
3c0ef626 | 3287 | 6000 + display_number, strerror(errno)); |
3288 | close(sock); | |
3289 | continue; | |
3290 | } | |
3291 | /* Success */ | |
3292 | break; | |
3293 | } | |
3294 | freeaddrinfo(aitop); | |
3295 | if (!ai) { | |
9108f8d9 | 3296 | error("connect %.100s port %u: %.100s", buf, 6000 + display_number, |
3c0ef626 | 3297 | strerror(errno)); |
3298 | return -1; | |
3299 | } | |
e9a17296 | 3300 | set_nodelay(sock); |
3c0ef626 | 3301 | return sock; |
3302 | } | |
3303 | ||
3304 | /* | |
3305 | * This is called when SSH_SMSG_X11_OPEN is received. The packet contains | |
3306 | * the remote channel number. We should do whatever we want, and respond | |
3307 | * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE. | |
3308 | */ | |
3309 | ||
9108f8d9 | 3310 | /* ARGSUSED */ |
3c0ef626 | 3311 | void |
e9a17296 | 3312 | x11_input_open(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 3313 | { |
3314 | Channel *c = NULL; | |
3315 | int remote_id, sock = 0; | |
3316 | char *remote_host; | |
3317 | ||
3318 | debug("Received X11 open request."); | |
3319 | ||
3320 | remote_id = packet_get_int(); | |
3321 | ||
3322 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) { | |
3323 | remote_host = packet_get_string(NULL); | |
3324 | } else { | |
3325 | remote_host = xstrdup("unknown (remote did not supply name)"); | |
3326 | } | |
e9a17296 | 3327 | packet_check_eom(); |
3c0ef626 | 3328 | |
3329 | /* Obtain a connection to the real X display. */ | |
3330 | sock = x11_connect_display(); | |
3331 | if (sock != -1) { | |
3332 | /* Allocate a channel for this connection. */ | |
3333 | c = channel_new("connected x11 socket", | |
3334 | SSH_CHANNEL_X11_OPEN, sock, sock, -1, 0, 0, 0, | |
3335 | remote_host, 1); | |
e9a17296 | 3336 | c->remote_id = remote_id; |
3337 | c->force_drain = 1; | |
3c0ef626 | 3338 | } |
0fff78ff | 3339 | xfree(remote_host); |
3c0ef626 | 3340 | if (c == NULL) { |
3341 | /* Send refusal to the remote host. */ | |
3342 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
3343 | packet_put_int(remote_id); | |
3344 | } else { | |
3345 | /* Send a confirmation to the remote host. */ | |
3346 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
3347 | packet_put_int(remote_id); | |
3348 | packet_put_int(c->self); | |
3349 | } | |
3350 | packet_send(); | |
3351 | } | |
3352 | ||
3353 | /* dummy protocol handler that denies SSH-1 requests (agent/x11) */ | |
9108f8d9 | 3354 | /* ARGSUSED */ |
3c0ef626 | 3355 | void |
e9a17296 | 3356 | deny_input_open(int type, u_int32_t seq, void *ctxt) |
3c0ef626 | 3357 | { |
3358 | int rchan = packet_get_int(); | |
41b2f314 | 3359 | |
e9a17296 | 3360 | switch (type) { |
3c0ef626 | 3361 | case SSH_SMSG_AGENT_OPEN: |
3362 | error("Warning: ssh server tried agent forwarding."); | |
3363 | break; | |
3364 | case SSH_SMSG_X11_OPEN: | |
3365 | error("Warning: ssh server tried X11 forwarding."); | |
3366 | break; | |
3367 | default: | |
e9a17296 | 3368 | error("deny_input_open: type %d", type); |
3c0ef626 | 3369 | break; |
3370 | } | |
2c06c99b | 3371 | error("Warning: this is probably a break-in attempt by a malicious server."); |
3c0ef626 | 3372 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
3373 | packet_put_int(rchan); | |
3374 | packet_send(); | |
3375 | } | |
3376 | ||
3377 | /* | |
3378 | * Requests forwarding of X11 connections, generates fake authentication | |
3379 | * data, and enables authentication spoofing. | |
3380 | * This should be called in the client only. | |
3381 | */ | |
3382 | void | |
665a873d | 3383 | x11_request_forwarding_with_spoofing(int client_session_id, const char *disp, |
3c0ef626 | 3384 | const char *proto, const char *data) |
3385 | { | |
3386 | u_int data_len = (u_int) strlen(data) / 2; | |
665a873d | 3387 | u_int i, value; |
3c0ef626 | 3388 | char *new_data; |
3389 | int screen_number; | |
3390 | const char *cp; | |
c9f39d2c | 3391 | u_int32_t rnd = 0; |
3c0ef626 | 3392 | |
665a873d | 3393 | if (x11_saved_display == NULL) |
3394 | x11_saved_display = xstrdup(disp); | |
3395 | else if (strcmp(disp, x11_saved_display) != 0) { | |
3396 | error("x11_request_forwarding_with_spoofing: different " | |
3397 | "$DISPLAY already forwarded"); | |
3398 | return; | |
3399 | } | |
3400 | ||
9108f8d9 | 3401 | cp = strchr(disp, ':'); |
3c0ef626 | 3402 | if (cp) |
3403 | cp = strchr(cp, '.'); | |
3404 | if (cp) | |
9108f8d9 | 3405 | screen_number = (u_int)strtonum(cp + 1, 0, 400, NULL); |
3c0ef626 | 3406 | else |
3407 | screen_number = 0; | |
3408 | ||
665a873d | 3409 | if (x11_saved_proto == NULL) { |
3410 | /* Save protocol name. */ | |
3411 | x11_saved_proto = xstrdup(proto); | |
3412 | /* | |
3413 | * Extract real authentication data and generate fake data | |
3414 | * of the same length. | |
3415 | */ | |
3416 | x11_saved_data = xmalloc(data_len); | |
3417 | x11_fake_data = xmalloc(data_len); | |
3418 | for (i = 0; i < data_len; i++) { | |
3419 | if (sscanf(data + 2 * i, "%2x", &value) != 1) | |
3420 | fatal("x11_request_forwarding: bad " | |
3421 | "authentication data: %.100s", data); | |
3422 | if (i % 4 == 0) | |
3423 | rnd = arc4random(); | |
3424 | x11_saved_data[i] = value; | |
3425 | x11_fake_data[i] = rnd & 0xff; | |
3426 | rnd >>= 8; | |
3427 | } | |
3428 | x11_saved_data_len = data_len; | |
3429 | x11_fake_data_len = data_len; | |
3430 | } | |
3c0ef626 | 3431 | |
3432 | /* Convert the fake data into hex. */ | |
665a873d | 3433 | new_data = tohex(x11_fake_data, data_len); |
3c0ef626 | 3434 | |
3435 | /* Send the request packet. */ | |
3436 | if (compat20) { | |
3437 | channel_request_start(client_session_id, "x11-req", 0); | |
3438 | packet_put_char(0); /* XXX bool single connection */ | |
3439 | } else { | |
3440 | packet_start(SSH_CMSG_X11_REQUEST_FORWARDING); | |
3441 | } | |
3442 | packet_put_cstring(proto); | |
3443 | packet_put_cstring(new_data); | |
3444 | packet_put_int(screen_number); | |
3445 | packet_send(); | |
3446 | packet_write_wait(); | |
3447 | xfree(new_data); | |
3448 | } | |
3449 | ||
3450 | ||
3451 | /* -- agent forwarding */ | |
3452 | ||
3453 | /* Sends a message to the server to request authentication fd forwarding. */ | |
3454 | ||
3455 | void | |
e9a17296 | 3456 | auth_request_forwarding(void) |
3c0ef626 | 3457 | { |
3458 | packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING); | |
3459 | packet_send(); | |
3460 | packet_write_wait(); | |
3461 | } |