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7501ed0d | 1 | /* $OpenBSD: channels.c,v 1.299 2009/11/11 21:37:03 markus Exp $ */ |
8efc0c15 | 2 | /* |
5260325f | 3 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
5260325f | 4 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
5 | * All rights reserved | |
5260325f | 6 | * This file contains functions for generic socket connection forwarding. |
7 | * There is also code for initiating connection forwarding for X11 connections, | |
8 | * arbitrary tcp/ip connections, and the authentication agent connection. | |
6ae2364d | 9 | * |
bcbf86ec | 10 | * As far as I am concerned, the code I have written for this software |
11 | * can be used freely for any purpose. Any derived versions of this | |
12 | * software must be clearly marked as such, and if the derived work is | |
13 | * incompatible with the protocol description in the RFC file, it must be | |
14 | * called by a name other than "ssh" or "Secure Shell". | |
15 | * | |
7e7327a1 | 16 | * SSH2 support added by Markus Friedl. |
8341f420 | 17 | * Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved. |
bcbf86ec | 18 | * Copyright (c) 1999 Dug Song. All rights reserved. |
19 | * Copyright (c) 1999 Theo de Raadt. All rights reserved. | |
20 | * | |
21 | * Redistribution and use in source and binary forms, with or without | |
22 | * modification, are permitted provided that the following conditions | |
23 | * are met: | |
24 | * 1. Redistributions of source code must retain the above copyright | |
25 | * notice, this list of conditions and the following disclaimer. | |
26 | * 2. Redistributions in binary form must reproduce the above copyright | |
27 | * notice, this list of conditions and the following disclaimer in the | |
28 | * documentation and/or other materials provided with the distribution. | |
29 | * | |
30 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
31 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
32 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
33 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
34 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
35 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
36 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
37 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
38 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
39 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
5260325f | 40 | */ |
8efc0c15 | 41 | |
42 | #include "includes.h" | |
bd7c69ea | 43 | |
cebb4c24 | 44 | #include <sys/types.h> |
31652869 | 45 | #include <sys/ioctl.h> |
cebb4c24 | 46 | #include <sys/un.h> |
319d6b41 | 47 | #include <sys/socket.h> |
e264ac72 | 48 | #ifdef HAVE_SYS_TIME_H |
49 | # include <sys/time.h> | |
50 | #endif | |
319d6b41 | 51 | |
52 | #include <netinet/in.h> | |
53 | #include <arpa/inet.h> | |
1d3e026f | 54 | |
028094f4 | 55 | #include <errno.h> |
fe5bc072 | 56 | #include <fcntl.h> |
28cb0a43 | 57 | #include <netdb.h> |
cf851879 | 58 | #include <stdio.h> |
ffa517a8 | 59 | #include <stdlib.h> |
00146caa | 60 | #include <string.h> |
1d3e026f | 61 | #include <termios.h> |
5188ba17 | 62 | #include <unistd.h> |
31652869 | 63 | #include <stdarg.h> |
8efc0c15 | 64 | |
3593bdc0 | 65 | #include "openbsd-compat/sys-queue.h" |
31652869 | 66 | #include "xmalloc.h" |
8efc0c15 | 67 | #include "ssh.h" |
42f11eb2 | 68 | #include "ssh1.h" |
69 | #include "ssh2.h" | |
8efc0c15 | 70 | #include "packet.h" |
42f11eb2 | 71 | #include "log.h" |
72 | #include "misc.h" | |
31652869 | 73 | #include "buffer.h" |
8efc0c15 | 74 | #include "channels.h" |
8efc0c15 | 75 | #include "compat.h" |
42f11eb2 | 76 | #include "canohost.h" |
4c8722d9 | 77 | #include "key.h" |
78 | #include "authfd.h" | |
805e659f | 79 | #include "pathnames.h" |
8efc0c15 | 80 | |
8e7895b8 | 81 | /* -- channel core */ |
8efc0c15 | 82 | |
aa3378df | 83 | /* |
84 | * Pointer to an array containing all allocated channels. The array is | |
85 | * dynamically extended as needed. | |
86 | */ | |
719fc62f | 87 | static Channel **channels = NULL; |
8efc0c15 | 88 | |
aa3378df | 89 | /* |
90 | * Size of the channel array. All slots of the array must always be | |
719fc62f | 91 | * initialized (at least the type field); unused slots set to NULL |
aa3378df | 92 | */ |
9a995072 | 93 | static u_int channels_alloc = 0; |
8efc0c15 | 94 | |
aa3378df | 95 | /* |
96 | * Maximum file descriptor value used in any of the channels. This is | |
719fc62f | 97 | * updated in channel_new. |
aa3378df | 98 | */ |
39929cdb | 99 | static int channel_max_fd = 0; |
8efc0c15 | 100 | |
8efc0c15 | 101 | |
8e7895b8 | 102 | /* -- tcp forwarding */ |
8efc0c15 | 103 | |
aa3378df | 104 | /* |
105 | * Data structure for storing which hosts are permitted for forward requests. | |
106 | * The local sides of any remote forwards are stored in this array to prevent | |
107 | * a corrupt remote server from accessing arbitrary TCP/IP ports on our local | |
108 | * network (which might be behind a firewall). | |
109 | */ | |
5260325f | 110 | typedef struct { |
7368a6c8 | 111 | char *host_to_connect; /* Connect to 'host'. */ |
112 | u_short port_to_connect; /* Connect to 'port'. */ | |
113 | u_short listen_port; /* Remote side should listen port number. */ | |
8efc0c15 | 114 | } ForwardPermission; |
115 | ||
2fefbadf | 116 | /* List of all permitted host/port pairs to connect by the user. */ |
8efc0c15 | 117 | static ForwardPermission permitted_opens[SSH_MAX_FORWARDS_PER_DIRECTION]; |
8e7895b8 | 118 | |
2fefbadf | 119 | /* List of all permitted host/port pairs to connect by the admin. */ |
120 | static ForwardPermission permitted_adm_opens[SSH_MAX_FORWARDS_PER_DIRECTION]; | |
121 | ||
122 | /* Number of permitted host/port pairs in the array permitted by the user. */ | |
8efc0c15 | 123 | static int num_permitted_opens = 0; |
2fefbadf | 124 | |
125 | /* Number of permitted host/port pair in the array permitted by the admin. */ | |
126 | static int num_adm_permitted_opens = 0; | |
127 | ||
aa3378df | 128 | /* |
129 | * If this is true, all opens are permitted. This is the case on the server | |
130 | * on which we have to trust the client anyway, and the user could do | |
131 | * anything after logging in anyway. | |
132 | */ | |
8efc0c15 | 133 | static int all_opens_permitted = 0; |
134 | ||
8efc0c15 | 135 | |
8e7895b8 | 136 | /* -- X11 forwarding */ |
42f11eb2 | 137 | |
8e7895b8 | 138 | /* Maximum number of fake X11 displays to try. */ |
139 | #define MAX_DISPLAYS 1000 | |
0490e609 | 140 | |
ef07103c | 141 | /* Saved X11 local (client) display. */ |
142 | static char *x11_saved_display = NULL; | |
143 | ||
8e7895b8 | 144 | /* Saved X11 authentication protocol name. */ |
145 | static char *x11_saved_proto = NULL; | |
8efc0c15 | 146 | |
8e7895b8 | 147 | /* Saved X11 authentication data. This is the real data. */ |
148 | static char *x11_saved_data = NULL; | |
149 | static u_int x11_saved_data_len = 0; | |
150 | ||
151 | /* | |
152 | * Fake X11 authentication data. This is what the server will be sending us; | |
153 | * we should replace any occurrences of this by the real data. | |
154 | */ | |
338eb2ab | 155 | static u_char *x11_fake_data = NULL; |
8e7895b8 | 156 | static u_int x11_fake_data_len; |
157 | ||
158 | ||
159 | /* -- agent forwarding */ | |
8efc0c15 | 160 | |
8e7895b8 | 161 | #define NUM_SOCKS 10 |
162 | ||
8e7895b8 | 163 | /* AF_UNSPEC or AF_INET or AF_INET6 */ |
5e4a7219 | 164 | static int IPv4or6 = AF_UNSPEC; |
8e7895b8 | 165 | |
fe7dba42 | 166 | /* Set the routing domain a.k.a. VRF */ |
167 | static int channel_rdomain = -1; | |
168 | ||
8e7895b8 | 169 | /* helper */ |
396c147e | 170 | static void port_open_helper(Channel *c, char *rtype); |
8e7895b8 | 171 | |
e07e21ad | 172 | /* non-blocking connect helpers */ |
173 | static int connect_next(struct channel_connect *); | |
174 | static void channel_connect_ctx_free(struct channel_connect *); | |
175 | ||
8e7895b8 | 176 | /* -- channel core */ |
7368a6c8 | 177 | |
178 | Channel * | |
b872f7f0 | 179 | channel_by_id(int id) |
7368a6c8 | 180 | { |
181 | Channel *c; | |
719fc62f | 182 | |
9a995072 | 183 | if (id < 0 || (u_int)id >= channels_alloc) { |
b872f7f0 | 184 | logit("channel_by_id: %d: bad id", id); |
7368a6c8 | 185 | return NULL; |
186 | } | |
719fc62f | 187 | c = channels[id]; |
188 | if (c == NULL) { | |
b872f7f0 | 189 | logit("channel_by_id: %d: bad id: channel free", id); |
7368a6c8 | 190 | return NULL; |
191 | } | |
192 | return c; | |
193 | } | |
194 | ||
b872f7f0 | 195 | /* |
196 | * Returns the channel if it is allowed to receive protocol messages. | |
197 | * Private channels, like listening sockets, may not receive messages. | |
198 | */ | |
199 | Channel * | |
200 | channel_lookup(int id) | |
201 | { | |
202 | Channel *c; | |
203 | ||
204 | if ((c = channel_by_id(id)) == NULL) | |
205 | return (NULL); | |
206 | ||
c8e9c167 | 207 | switch (c->type) { |
b872f7f0 | 208 | case SSH_CHANNEL_X11_OPEN: |
209 | case SSH_CHANNEL_LARVAL: | |
210 | case SSH_CHANNEL_CONNECTING: | |
211 | case SSH_CHANNEL_DYNAMIC: | |
212 | case SSH_CHANNEL_OPENING: | |
213 | case SSH_CHANNEL_OPEN: | |
214 | case SSH_CHANNEL_INPUT_DRAINING: | |
215 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
216 | return (c); | |
b872f7f0 | 217 | } |
218 | logit("Non-public channel %d, type %d.", id, c->type); | |
219 | return (NULL); | |
220 | } | |
221 | ||
aa3378df | 222 | /* |
1d1ffb87 | 223 | * Register filedescriptors for a channel, used when allocating a channel or |
0fbe8c74 | 224 | * when the channel consumer/producer is ready, e.g. shell exec'd |
aa3378df | 225 | */ |
396c147e | 226 | static void |
a22aff1f | 227 | channel_register_fds(Channel *c, int rfd, int wfd, int efd, |
b3784859 | 228 | int extusage, int nonblock, int is_tty) |
8efc0c15 | 229 | { |
5260325f | 230 | /* Update the maximum file descriptor value. */ |
39929cdb | 231 | channel_max_fd = MAX(channel_max_fd, rfd); |
232 | channel_max_fd = MAX(channel_max_fd, wfd); | |
233 | channel_max_fd = MAX(channel_max_fd, efd); | |
234 | ||
fe5bc072 | 235 | if (rfd != -1) |
236 | fcntl(rfd, F_SETFD, FD_CLOEXEC); | |
237 | if (wfd != -1 && wfd != rfd) | |
238 | fcntl(wfd, F_SETFD, FD_CLOEXEC); | |
239 | if (efd != -1 && efd != rfd && efd != wfd) | |
240 | fcntl(efd, F_SETFD, FD_CLOEXEC); | |
1d1ffb87 | 241 | |
0fbe8c74 | 242 | c->rfd = rfd; |
243 | c->wfd = wfd; | |
244 | c->sock = (rfd == wfd) ? rfd : -1; | |
5e96b616 | 245 | c->ctl_fd = -1; /* XXX: set elsewhere */ |
0fbe8c74 | 246 | c->efd = efd; |
247 | c->extended_usage = extusage; | |
a22aff1f | 248 | |
b3784859 | 249 | if ((c->isatty = is_tty) != 0) |
d7ac5f18 | 250 | debug2("channel %d: rfd %d isatty", c->self, c->rfd); |
245f4d36 | 251 | c->wfd_isatty = is_tty || isatty(c->wfd); |
0ae4fe1d | 252 | |
a22aff1f | 253 | /* enable nonblocking mode */ |
254 | if (nonblock) { | |
255 | if (rfd != -1) | |
256 | set_nonblock(rfd); | |
257 | if (wfd != -1) | |
258 | set_nonblock(wfd); | |
259 | if (efd != -1) | |
260 | set_nonblock(efd); | |
261 | } | |
0fbe8c74 | 262 | } |
263 | ||
264 | /* | |
265 | * Allocate a new channel object and set its type and socket. This will cause | |
266 | * remote_name to be freed. | |
267 | */ | |
719fc62f | 268 | Channel * |
0fbe8c74 | 269 | channel_new(char *ctype, int type, int rfd, int wfd, int efd, |
f91d9a89 | 270 | u_int window, u_int maxpack, int extusage, char *remote_name, int nonblock) |
0fbe8c74 | 271 | { |
9a995072 | 272 | int found; |
273 | u_int i; | |
0fbe8c74 | 274 | Channel *c; |
5260325f | 275 | |
276 | /* Do initial allocation if this is the first call. */ | |
277 | if (channels_alloc == 0) { | |
278 | channels_alloc = 10; | |
52e3daed | 279 | channels = xcalloc(channels_alloc, sizeof(Channel *)); |
5260325f | 280 | for (i = 0; i < channels_alloc; i++) |
719fc62f | 281 | channels[i] = NULL; |
5260325f | 282 | } |
283 | /* Try to find a free slot where to put the new channel. */ | |
284 | for (found = -1, i = 0; i < channels_alloc; i++) | |
719fc62f | 285 | if (channels[i] == NULL) { |
5260325f | 286 | /* Found a free slot. */ |
9a995072 | 287 | found = (int)i; |
5260325f | 288 | break; |
289 | } | |
9a995072 | 290 | if (found < 0) { |
aa3378df | 291 | /* There are no free slots. Take last+1 slot and expand the array. */ |
5260325f | 292 | found = channels_alloc; |
5df8c731 | 293 | if (channels_alloc > 10000) |
294 | fatal("channel_new: internal error: channels_alloc %d " | |
295 | "too big.", channels_alloc); | |
c5d10563 | 296 | channels = xrealloc(channels, channels_alloc + 10, |
297 | sizeof(Channel *)); | |
20419cc1 | 298 | channels_alloc += 10; |
de273eef | 299 | debug2("channel: expanding %d", channels_alloc); |
5260325f | 300 | for (i = found; i < channels_alloc; i++) |
719fc62f | 301 | channels[i] = NULL; |
5260325f | 302 | } |
719fc62f | 303 | /* Initialize and return new channel. */ |
52e3daed | 304 | c = channels[found] = xcalloc(1, sizeof(Channel)); |
5260325f | 305 | buffer_init(&c->input); |
306 | buffer_init(&c->output); | |
7368a6c8 | 307 | buffer_init(&c->extended); |
1338ba77 | 308 | c->path = NULL; |
70bef40e | 309 | c->ostate = CHAN_OUTPUT_OPEN; |
310 | c->istate = CHAN_INPUT_OPEN; | |
311 | c->flags = 0; | |
c9478090 | 312 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock, 0); |
5260325f | 313 | c->self = found; |
314 | c->type = type; | |
7368a6c8 | 315 | c->ctype = ctype; |
0b242b12 | 316 | c->local_window = window; |
317 | c->local_window_max = window; | |
318 | c->local_consumed = 0; | |
319 | c->local_maxpacket = maxpack; | |
5260325f | 320 | c->remote_id = -1; |
0d942eff | 321 | c->remote_name = xstrdup(remote_name); |
7368a6c8 | 322 | c->remote_window = 0; |
323 | c->remote_maxpacket = 0; | |
a5f82435 | 324 | c->force_drain = 0; |
ac151b18 | 325 | c->single_connection = 0; |
3cf2be58 | 326 | c->detach_user = NULL; |
8cd0437d | 327 | c->detach_close = 0; |
3593bdc0 | 328 | c->open_confirm = NULL; |
329 | c->open_confirm_ctx = NULL; | |
2e73a022 | 330 | c->input_filter = NULL; |
c1c6a032 | 331 | c->output_filter = NULL; |
e74caf1e | 332 | c->filter_ctx = NULL; |
333 | c->filter_cleanup = NULL; | |
7501ed0d | 334 | c->delayed = 1; /* prevent call to channel_post handler */ |
3593bdc0 | 335 | TAILQ_INIT(&c->status_confirms); |
5260325f | 336 | debug("channel %d: new [%s]", found, remote_name); |
719fc62f | 337 | return c; |
7368a6c8 | 338 | } |
8efc0c15 | 339 | |
489aa2e9 | 340 | static int |
341 | channel_find_maxfd(void) | |
342 | { | |
9a995072 | 343 | u_int i; |
344 | int max = 0; | |
489aa2e9 | 345 | Channel *c; |
346 | ||
347 | for (i = 0; i < channels_alloc; i++) { | |
348 | c = channels[i]; | |
349 | if (c != NULL) { | |
350 | max = MAX(max, c->rfd); | |
351 | max = MAX(max, c->wfd); | |
352 | max = MAX(max, c->efd); | |
353 | } | |
354 | } | |
355 | return max; | |
356 | } | |
357 | ||
358 | int | |
359 | channel_close_fd(int *fdp) | |
360 | { | |
361 | int ret = 0, fd = *fdp; | |
362 | ||
363 | if (fd != -1) { | |
364 | ret = close(fd); | |
365 | *fdp = -1; | |
366 | if (fd == channel_max_fd) | |
367 | channel_max_fd = channel_find_maxfd(); | |
368 | } | |
369 | return ret; | |
370 | } | |
371 | ||
0fbe8c74 | 372 | /* Close all channel fd/socket. */ |
396c147e | 373 | static void |
0fbe8c74 | 374 | channel_close_fds(Channel *c) |
375 | { | |
5e96b616 | 376 | debug3("channel %d: close_fds r %d w %d e %d c %d", |
377 | c->self, c->rfd, c->wfd, c->efd, c->ctl_fd); | |
6fd8622b | 378 | |
489aa2e9 | 379 | channel_close_fd(&c->sock); |
5e96b616 | 380 | channel_close_fd(&c->ctl_fd); |
489aa2e9 | 381 | channel_close_fd(&c->rfd); |
382 | channel_close_fd(&c->wfd); | |
383 | channel_close_fd(&c->efd); | |
0fbe8c74 | 384 | } |
385 | ||
8e7895b8 | 386 | /* Free the channel and close its fd/socket. */ |
8e7895b8 | 387 | void |
388 | channel_free(Channel *c) | |
389 | { | |
390 | char *s; | |
9a995072 | 391 | u_int i, n; |
3593bdc0 | 392 | struct channel_confirm *cc; |
8e7895b8 | 393 | |
394 | for (n = 0, i = 0; i < channels_alloc; i++) | |
395 | if (channels[i]) | |
396 | n++; | |
9a995072 | 397 | debug("channel %d: free: %s, nchannels %u", c->self, |
8e7895b8 | 398 | c->remote_name ? c->remote_name : "???", n); |
399 | ||
400 | s = channel_open_message(); | |
d7ac5f18 | 401 | debug3("channel %d: status: %s", c->self, s); |
8e7895b8 | 402 | xfree(s); |
403 | ||
8e7895b8 | 404 | if (c->sock != -1) |
405 | shutdown(c->sock, SHUT_RDWR); | |
5e96b616 | 406 | if (c->ctl_fd != -1) |
407 | shutdown(c->ctl_fd, SHUT_RDWR); | |
8e7895b8 | 408 | channel_close_fds(c); |
409 | buffer_free(&c->input); | |
410 | buffer_free(&c->output); | |
411 | buffer_free(&c->extended); | |
412 | if (c->remote_name) { | |
413 | xfree(c->remote_name); | |
414 | c->remote_name = NULL; | |
415 | } | |
1338ba77 | 416 | if (c->path) { |
417 | xfree(c->path); | |
418 | c->path = NULL; | |
419 | } | |
3593bdc0 | 420 | while ((cc = TAILQ_FIRST(&c->status_confirms)) != NULL) { |
421 | if (cc->abandon_cb != NULL) | |
422 | cc->abandon_cb(c, cc->ctx); | |
423 | TAILQ_REMOVE(&c->status_confirms, cc, entry); | |
424 | bzero(cc, sizeof(*cc)); | |
425 | xfree(cc); | |
426 | } | |
e74caf1e | 427 | if (c->filter_cleanup != NULL && c->filter_ctx != NULL) |
428 | c->filter_cleanup(c->self, c->filter_ctx); | |
8e7895b8 | 429 | channels[c->self] = NULL; |
430 | xfree(c); | |
431 | } | |
432 | ||
8e7895b8 | 433 | void |
d6746a0b | 434 | channel_free_all(void) |
8e7895b8 | 435 | { |
9a995072 | 436 | u_int i; |
8e7895b8 | 437 | |
d6746a0b | 438 | for (i = 0; i < channels_alloc; i++) |
439 | if (channels[i] != NULL) | |
440 | channel_free(channels[i]); | |
8e7895b8 | 441 | } |
442 | ||
443 | /* | |
444 | * Closes the sockets/fds of all channels. This is used to close extra file | |
445 | * descriptors after a fork. | |
446 | */ | |
8e7895b8 | 447 | void |
d5bb9418 | 448 | channel_close_all(void) |
8e7895b8 | 449 | { |
9a995072 | 450 | u_int i; |
8e7895b8 | 451 | |
452 | for (i = 0; i < channels_alloc; i++) | |
453 | if (channels[i] != NULL) | |
454 | channel_close_fds(channels[i]); | |
455 | } | |
456 | ||
3cf2be58 | 457 | /* |
458 | * Stop listening to channels. | |
459 | */ | |
3cf2be58 | 460 | void |
461 | channel_stop_listening(void) | |
462 | { | |
9a995072 | 463 | u_int i; |
3cf2be58 | 464 | Channel *c; |
465 | ||
466 | for (i = 0; i < channels_alloc; i++) { | |
467 | c = channels[i]; | |
468 | if (c != NULL) { | |
469 | switch (c->type) { | |
470 | case SSH_CHANNEL_AUTH_SOCKET: | |
471 | case SSH_CHANNEL_PORT_LISTENER: | |
472 | case SSH_CHANNEL_RPORT_LISTENER: | |
473 | case SSH_CHANNEL_X11_LISTENER: | |
489aa2e9 | 474 | channel_close_fd(&c->sock); |
3cf2be58 | 475 | channel_free(c); |
476 | break; | |
477 | } | |
478 | } | |
479 | } | |
480 | } | |
481 | ||
8e7895b8 | 482 | /* |
483 | * Returns true if no channel has too much buffered data, and false if one or | |
484 | * more channel is overfull. | |
485 | */ | |
8e7895b8 | 486 | int |
d5bb9418 | 487 | channel_not_very_much_buffered_data(void) |
8e7895b8 | 488 | { |
489 | u_int i; | |
490 | Channel *c; | |
491 | ||
492 | for (i = 0; i < channels_alloc; i++) { | |
493 | c = channels[i]; | |
494 | if (c != NULL && c->type == SSH_CHANNEL_OPEN) { | |
0c139bd1 | 495 | #if 0 |
496 | if (!compat20 && | |
497 | buffer_len(&c->input) > packet_get_maxsize()) { | |
faa483fa | 498 | debug2("channel %d: big input buffer %d", |
8e7895b8 | 499 | c->self, buffer_len(&c->input)); |
500 | return 0; | |
501 | } | |
0c139bd1 | 502 | #endif |
8e7895b8 | 503 | if (buffer_len(&c->output) > packet_get_maxsize()) { |
a27002e5 | 504 | debug2("channel %d: big output buffer %u > %u", |
0c139bd1 | 505 | c->self, buffer_len(&c->output), |
506 | packet_get_maxsize()); | |
8e7895b8 | 507 | return 0; |
508 | } | |
509 | } | |
510 | } | |
511 | return 1; | |
512 | } | |
513 | ||
514 | /* Returns true if any channel is still open. */ | |
8e7895b8 | 515 | int |
d5bb9418 | 516 | channel_still_open(void) |
8e7895b8 | 517 | { |
9a995072 | 518 | u_int i; |
8e7895b8 | 519 | Channel *c; |
520 | ||
521 | for (i = 0; i < channels_alloc; i++) { | |
522 | c = channels[i]; | |
523 | if (c == NULL) | |
524 | continue; | |
525 | switch (c->type) { | |
526 | case SSH_CHANNEL_X11_LISTENER: | |
527 | case SSH_CHANNEL_PORT_LISTENER: | |
528 | case SSH_CHANNEL_RPORT_LISTENER: | |
529 | case SSH_CHANNEL_CLOSED: | |
530 | case SSH_CHANNEL_AUTH_SOCKET: | |
531 | case SSH_CHANNEL_DYNAMIC: | |
532 | case SSH_CHANNEL_CONNECTING: | |
533 | case SSH_CHANNEL_ZOMBIE: | |
534 | continue; | |
535 | case SSH_CHANNEL_LARVAL: | |
536 | if (!compat20) | |
537 | fatal("cannot happen: SSH_CHANNEL_LARVAL"); | |
538 | continue; | |
539 | case SSH_CHANNEL_OPENING: | |
540 | case SSH_CHANNEL_OPEN: | |
541 | case SSH_CHANNEL_X11_OPEN: | |
542 | return 1; | |
543 | case SSH_CHANNEL_INPUT_DRAINING: | |
544 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
545 | if (!compat13) | |
546 | fatal("cannot happen: OUT_DRAIN"); | |
547 | return 1; | |
548 | default: | |
549 | fatal("channel_still_open: bad channel type %d", c->type); | |
550 | /* NOTREACHED */ | |
551 | } | |
552 | } | |
553 | return 0; | |
554 | } | |
555 | ||
556 | /* Returns the id of an open channel suitable for keepaliving */ | |
8e7895b8 | 557 | int |
d5bb9418 | 558 | channel_find_open(void) |
8e7895b8 | 559 | { |
9a995072 | 560 | u_int i; |
8e7895b8 | 561 | Channel *c; |
562 | ||
563 | for (i = 0; i < channels_alloc; i++) { | |
564 | c = channels[i]; | |
13de3560 | 565 | if (c == NULL || c->remote_id < 0) |
8e7895b8 | 566 | continue; |
567 | switch (c->type) { | |
568 | case SSH_CHANNEL_CLOSED: | |
569 | case SSH_CHANNEL_DYNAMIC: | |
570 | case SSH_CHANNEL_X11_LISTENER: | |
571 | case SSH_CHANNEL_PORT_LISTENER: | |
572 | case SSH_CHANNEL_RPORT_LISTENER: | |
573 | case SSH_CHANNEL_OPENING: | |
574 | case SSH_CHANNEL_CONNECTING: | |
575 | case SSH_CHANNEL_ZOMBIE: | |
576 | continue; | |
577 | case SSH_CHANNEL_LARVAL: | |
578 | case SSH_CHANNEL_AUTH_SOCKET: | |
579 | case SSH_CHANNEL_OPEN: | |
580 | case SSH_CHANNEL_X11_OPEN: | |
581 | return i; | |
582 | case SSH_CHANNEL_INPUT_DRAINING: | |
583 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
584 | if (!compat13) | |
585 | fatal("cannot happen: OUT_DRAIN"); | |
586 | return i; | |
587 | default: | |
588 | fatal("channel_find_open: bad channel type %d", c->type); | |
589 | /* NOTREACHED */ | |
590 | } | |
591 | } | |
592 | return -1; | |
593 | } | |
594 | ||
595 | ||
596 | /* | |
597 | * Returns a message describing the currently open forwarded connections, | |
598 | * suitable for sending to the client. The message contains crlf pairs for | |
599 | * newlines. | |
600 | */ | |
8e7895b8 | 601 | char * |
d5bb9418 | 602 | channel_open_message(void) |
8e7895b8 | 603 | { |
604 | Buffer buffer; | |
605 | Channel *c; | |
606 | char buf[1024], *cp; | |
9a995072 | 607 | u_int i; |
8e7895b8 | 608 | |
609 | buffer_init(&buffer); | |
610 | snprintf(buf, sizeof buf, "The following connections are open:\r\n"); | |
611 | buffer_append(&buffer, buf, strlen(buf)); | |
612 | for (i = 0; i < channels_alloc; i++) { | |
613 | c = channels[i]; | |
614 | if (c == NULL) | |
615 | continue; | |
616 | switch (c->type) { | |
617 | case SSH_CHANNEL_X11_LISTENER: | |
618 | case SSH_CHANNEL_PORT_LISTENER: | |
619 | case SSH_CHANNEL_RPORT_LISTENER: | |
620 | case SSH_CHANNEL_CLOSED: | |
621 | case SSH_CHANNEL_AUTH_SOCKET: | |
622 | case SSH_CHANNEL_ZOMBIE: | |
623 | continue; | |
624 | case SSH_CHANNEL_LARVAL: | |
625 | case SSH_CHANNEL_OPENING: | |
626 | case SSH_CHANNEL_CONNECTING: | |
627 | case SSH_CHANNEL_DYNAMIC: | |
628 | case SSH_CHANNEL_OPEN: | |
629 | case SSH_CHANNEL_X11_OPEN: | |
630 | case SSH_CHANNEL_INPUT_DRAINING: | |
631 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
5e96b616 | 632 | snprintf(buf, sizeof buf, |
633 | " #%d %.300s (t%d r%d i%d/%d o%d/%d fd %d/%d cfd %d)\r\n", | |
8e7895b8 | 634 | c->self, c->remote_name, |
635 | c->type, c->remote_id, | |
636 | c->istate, buffer_len(&c->input), | |
637 | c->ostate, buffer_len(&c->output), | |
5e96b616 | 638 | c->rfd, c->wfd, c->ctl_fd); |
8e7895b8 | 639 | buffer_append(&buffer, buf, strlen(buf)); |
640 | continue; | |
641 | default: | |
642 | fatal("channel_open_message: bad channel type %d", c->type); | |
643 | /* NOTREACHED */ | |
644 | } | |
645 | } | |
646 | buffer_append(&buffer, "\0", 1); | |
647 | cp = xstrdup(buffer_ptr(&buffer)); | |
648 | buffer_free(&buffer); | |
649 | return cp; | |
650 | } | |
651 | ||
652 | void | |
653 | channel_send_open(int id) | |
654 | { | |
655 | Channel *c = channel_lookup(id); | |
e1feb9bf | 656 | |
8e7895b8 | 657 | if (c == NULL) { |
bbe88b6d | 658 | logit("channel_send_open: %d: bad id", id); |
8e7895b8 | 659 | return; |
660 | } | |
6226a8f8 | 661 | debug2("channel %d: send open", id); |
8e7895b8 | 662 | packet_start(SSH2_MSG_CHANNEL_OPEN); |
663 | packet_put_cstring(c->ctype); | |
664 | packet_put_int(c->self); | |
665 | packet_put_int(c->local_window); | |
666 | packet_put_int(c->local_maxpacket); | |
667 | packet_send(); | |
668 | } | |
669 | ||
670 | void | |
6226a8f8 | 671 | channel_request_start(int id, char *service, int wantconfirm) |
8e7895b8 | 672 | { |
6226a8f8 | 673 | Channel *c = channel_lookup(id); |
e1feb9bf | 674 | |
8e7895b8 | 675 | if (c == NULL) { |
bbe88b6d | 676 | logit("channel_request_start: %d: unknown channel id", id); |
8e7895b8 | 677 | return; |
678 | } | |
5e96b616 | 679 | debug2("channel %d: request %s confirm %d", id, service, wantconfirm); |
8e7895b8 | 680 | packet_start(SSH2_MSG_CHANNEL_REQUEST); |
681 | packet_put_int(c->remote_id); | |
682 | packet_put_cstring(service); | |
683 | packet_put_char(wantconfirm); | |
684 | } | |
a7137f6b | 685 | |
8e7895b8 | 686 | void |
3593bdc0 | 687 | channel_register_status_confirm(int id, channel_confirm_cb *cb, |
688 | channel_confirm_abandon_cb *abandon_cb, void *ctx) | |
689 | { | |
690 | struct channel_confirm *cc; | |
691 | Channel *c; | |
692 | ||
693 | if ((c = channel_lookup(id)) == NULL) | |
694 | fatal("channel_register_expect: %d: bad id", id); | |
695 | ||
696 | cc = xmalloc(sizeof(*cc)); | |
697 | cc->cb = cb; | |
698 | cc->abandon_cb = abandon_cb; | |
699 | cc->ctx = ctx; | |
700 | TAILQ_INSERT_TAIL(&c->status_confirms, cc, entry); | |
701 | } | |
702 | ||
703 | void | |
704 | channel_register_open_confirm(int id, channel_callback_fn *fn, void *ctx) | |
8e7895b8 | 705 | { |
706 | Channel *c = channel_lookup(id); | |
e1feb9bf | 707 | |
8e7895b8 | 708 | if (c == NULL) { |
2ea438c2 | 709 | logit("channel_register_open_confirm: %d: bad id", id); |
8e7895b8 | 710 | return; |
711 | } | |
3593bdc0 | 712 | c->open_confirm = fn; |
713 | c->open_confirm_ctx = ctx; | |
8e7895b8 | 714 | } |
a7137f6b | 715 | |
8e7895b8 | 716 | void |
8cd0437d | 717 | channel_register_cleanup(int id, channel_callback_fn *fn, int do_close) |
8e7895b8 | 718 | { |
b872f7f0 | 719 | Channel *c = channel_by_id(id); |
e1feb9bf | 720 | |
8e7895b8 | 721 | if (c == NULL) { |
bbe88b6d | 722 | logit("channel_register_cleanup: %d: bad id", id); |
8e7895b8 | 723 | return; |
724 | } | |
3cf2be58 | 725 | c->detach_user = fn; |
8cd0437d | 726 | c->detach_close = do_close; |
8e7895b8 | 727 | } |
a7137f6b | 728 | |
8e7895b8 | 729 | void |
730 | channel_cancel_cleanup(int id) | |
731 | { | |
b872f7f0 | 732 | Channel *c = channel_by_id(id); |
e1feb9bf | 733 | |
8e7895b8 | 734 | if (c == NULL) { |
bbe88b6d | 735 | logit("channel_cancel_cleanup: %d: bad id", id); |
8e7895b8 | 736 | return; |
737 | } | |
3cf2be58 | 738 | c->detach_user = NULL; |
8cd0437d | 739 | c->detach_close = 0; |
8e7895b8 | 740 | } |
a7137f6b | 741 | |
8e7895b8 | 742 | void |
c1c6a032 | 743 | channel_register_filter(int id, channel_infilter_fn *ifn, |
e74caf1e | 744 | channel_outfilter_fn *ofn, channel_filter_cleanup_fn *cfn, void *ctx) |
8e7895b8 | 745 | { |
746 | Channel *c = channel_lookup(id); | |
e1feb9bf | 747 | |
8e7895b8 | 748 | if (c == NULL) { |
bbe88b6d | 749 | logit("channel_register_filter: %d: bad id", id); |
8e7895b8 | 750 | return; |
751 | } | |
c1c6a032 | 752 | c->input_filter = ifn; |
753 | c->output_filter = ofn; | |
f17f705b | 754 | c->filter_ctx = ctx; |
e74caf1e | 755 | c->filter_cleanup = cfn; |
8e7895b8 | 756 | } |
757 | ||
6ae2364d | 758 | void |
8e7895b8 | 759 | channel_set_fds(int id, int rfd, int wfd, int efd, |
b3784859 | 760 | int extusage, int nonblock, int is_tty, u_int window_max) |
8efc0c15 | 761 | { |
8e7895b8 | 762 | Channel *c = channel_lookup(id); |
e1feb9bf | 763 | |
8e7895b8 | 764 | if (c == NULL || c->type != SSH_CHANNEL_LARVAL) |
765 | fatal("channel_activate for non-larval channel %d.", id); | |
b3784859 | 766 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock, is_tty); |
8e7895b8 | 767 | c->type = SSH_CHANNEL_OPEN; |
399d1ea6 | 768 | c->local_window = c->local_window_max = window_max; |
8e7895b8 | 769 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
770 | packet_put_int(c->remote_id); | |
771 | packet_put_int(c->local_window); | |
772 | packet_send(); | |
8efc0c15 | 773 | } |
774 | ||
aa3378df | 775 | /* |
7368a6c8 | 776 | * 'channel_pre*' are called just before select() to add any bits relevant to |
777 | * channels in the select bitmasks. | |
aa3378df | 778 | */ |
7368a6c8 | 779 | /* |
780 | * 'channel_post*': perform any appropriate operations for channels which | |
781 | * have events pending. | |
782 | */ | |
c8e9c167 | 783 | typedef void chan_fn(Channel *c, fd_set *readset, fd_set *writeset); |
7368a6c8 | 784 | chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE]; |
785 | chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE]; | |
8efc0c15 | 786 | |
ebb90778 | 787 | /* ARGSUSED */ |
396c147e | 788 | static void |
c8e9c167 | 789 | channel_pre_listener(Channel *c, fd_set *readset, fd_set *writeset) |
8efc0c15 | 790 | { |
7368a6c8 | 791 | FD_SET(c->sock, readset); |
792 | } | |
5260325f | 793 | |
ebb90778 | 794 | /* ARGSUSED */ |
396c147e | 795 | static void |
c8e9c167 | 796 | channel_pre_connecting(Channel *c, fd_set *readset, fd_set *writeset) |
97fb6912 | 797 | { |
798 | debug3("channel %d: waiting for connection", c->self); | |
799 | FD_SET(c->sock, writeset); | |
800 | } | |
801 | ||
396c147e | 802 | static void |
c8e9c167 | 803 | channel_pre_open_13(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 804 | { |
805 | if (buffer_len(&c->input) < packet_get_maxsize()) | |
806 | FD_SET(c->sock, readset); | |
807 | if (buffer_len(&c->output) > 0) | |
808 | FD_SET(c->sock, writeset); | |
809 | } | |
5260325f | 810 | |
396c147e | 811 | static void |
c8e9c167 | 812 | channel_pre_open(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 813 | { |
0c0738d5 | 814 | u_int limit = compat20 ? c->remote_window : packet_get_maxsize(); |
5260325f | 815 | |
7e7327a1 | 816 | if (c->istate == CHAN_INPUT_OPEN && |
0c0738d5 | 817 | limit > 0 && |
69d9d413 | 818 | buffer_len(&c->input) < limit && |
819 | buffer_check_alloc(&c->input, CHAN_RBUF)) | |
7e7327a1 | 820 | FD_SET(c->rfd, readset); |
821 | if (c->ostate == CHAN_OUTPUT_OPEN || | |
822 | c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { | |
823 | if (buffer_len(&c->output) > 0) { | |
824 | FD_SET(c->wfd, writeset); | |
825 | } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { | |
d2296ed7 | 826 | if (CHANNEL_EFD_OUTPUT_ACTIVE(c)) |
4e2e5cfd | 827 | debug2("channel %d: obuf_empty delayed efd %d/(%d)", |
828 | c->self, c->efd, buffer_len(&c->extended)); | |
d2296ed7 | 829 | else |
830 | chan_obuf_empty(c); | |
7e7327a1 | 831 | } |
832 | } | |
833 | /** XXX check close conditions, too */ | |
271f4a13 | 834 | if (compat20 && c->efd != -1 && |
835 | !(c->istate == CHAN_INPUT_CLOSED && c->ostate == CHAN_OUTPUT_CLOSED)) { | |
7e7327a1 | 836 | if (c->extended_usage == CHAN_EXTENDED_WRITE && |
837 | buffer_len(&c->extended) > 0) | |
838 | FD_SET(c->efd, writeset); | |
d2296ed7 | 839 | else if (!(c->flags & CHAN_EOF_SENT) && |
840 | c->extended_usage == CHAN_EXTENDED_READ && | |
7e7327a1 | 841 | buffer_len(&c->extended) < c->remote_window) |
842 | FD_SET(c->efd, readset); | |
843 | } | |
5e96b616 | 844 | /* XXX: What about efd? races? */ |
f2107e97 | 845 | if (compat20 && c->ctl_fd != -1 && |
5e96b616 | 846 | c->istate == CHAN_INPUT_OPEN && c->ostate == CHAN_OUTPUT_OPEN) |
847 | FD_SET(c->ctl_fd, readset); | |
7e7327a1 | 848 | } |
849 | ||
ebb90778 | 850 | /* ARGSUSED */ |
396c147e | 851 | static void |
c8e9c167 | 852 | channel_pre_input_draining(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 853 | { |
854 | if (buffer_len(&c->input) == 0) { | |
855 | packet_start(SSH_MSG_CHANNEL_CLOSE); | |
856 | packet_put_int(c->remote_id); | |
857 | packet_send(); | |
858 | c->type = SSH_CHANNEL_CLOSED; | |
d7ac5f18 | 859 | debug2("channel %d: closing after input drain.", c->self); |
7368a6c8 | 860 | } |
861 | } | |
5260325f | 862 | |
ebb90778 | 863 | /* ARGSUSED */ |
396c147e | 864 | static void |
c8e9c167 | 865 | channel_pre_output_draining(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 866 | { |
867 | if (buffer_len(&c->output) == 0) | |
719fc62f | 868 | chan_mark_dead(c); |
6ae2364d | 869 | else |
7368a6c8 | 870 | FD_SET(c->sock, writeset); |
871 | } | |
5260325f | 872 | |
7368a6c8 | 873 | /* |
874 | * This is a special state for X11 authentication spoofing. An opened X11 | |
875 | * connection (when authentication spoofing is being done) remains in this | |
876 | * state until the first packet has been completely read. The authentication | |
877 | * data in that packet is then substituted by the real data if it matches the | |
878 | * fake data, and the channel is put into normal mode. | |
0b242b12 | 879 | * XXX All this happens at the client side. |
8e7895b8 | 880 | * Returns: 0 = need more data, -1 = wrong cookie, 1 = ok |
7368a6c8 | 881 | */ |
396c147e | 882 | static int |
8e7895b8 | 883 | x11_open_helper(Buffer *b) |
7368a6c8 | 884 | { |
1e3b8b07 | 885 | u_char *ucp; |
886 | u_int proto_len, data_len; | |
5260325f | 887 | |
7368a6c8 | 888 | /* Check if the fixed size part of the packet is in buffer. */ |
8e7895b8 | 889 | if (buffer_len(b) < 12) |
7368a6c8 | 890 | return 0; |
891 | ||
892 | /* Parse the lengths of variable-length fields. */ | |
20905a8e | 893 | ucp = buffer_ptr(b); |
7368a6c8 | 894 | if (ucp[0] == 0x42) { /* Byte order MSB first. */ |
895 | proto_len = 256 * ucp[6] + ucp[7]; | |
896 | data_len = 256 * ucp[8] + ucp[9]; | |
897 | } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */ | |
898 | proto_len = ucp[6] + 256 * ucp[7]; | |
899 | data_len = ucp[8] + 256 * ucp[9]; | |
900 | } else { | |
d7ac5f18 | 901 | debug2("Initial X11 packet contains bad byte order byte: 0x%x", |
184eed6a | 902 | ucp[0]); |
7368a6c8 | 903 | return -1; |
904 | } | |
5260325f | 905 | |
7368a6c8 | 906 | /* Check if the whole packet is in buffer. */ |
8e7895b8 | 907 | if (buffer_len(b) < |
7368a6c8 | 908 | 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3)) |
909 | return 0; | |
5260325f | 910 | |
7368a6c8 | 911 | /* Check if authentication protocol matches. */ |
912 | if (proto_len != strlen(x11_saved_proto) || | |
913 | memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) { | |
d7ac5f18 | 914 | debug2("X11 connection uses different authentication protocol."); |
7368a6c8 | 915 | return -1; |
916 | } | |
917 | /* Check if authentication data matches our fake data. */ | |
918 | if (data_len != x11_fake_data_len || | |
919 | memcmp(ucp + 12 + ((proto_len + 3) & ~3), | |
920 | x11_fake_data, x11_fake_data_len) != 0) { | |
d7ac5f18 | 921 | debug2("X11 auth data does not match fake data."); |
7368a6c8 | 922 | return -1; |
923 | } | |
924 | /* Check fake data length */ | |
925 | if (x11_fake_data_len != x11_saved_data_len) { | |
926 | error("X11 fake_data_len %d != saved_data_len %d", | |
927 | x11_fake_data_len, x11_saved_data_len); | |
928 | return -1; | |
929 | } | |
930 | /* | |
931 | * Received authentication protocol and data match | |
932 | * our fake data. Substitute the fake data with real | |
933 | * data. | |
934 | */ | |
935 | memcpy(ucp + 12 + ((proto_len + 3) & ~3), | |
936 | x11_saved_data, x11_saved_data_len); | |
937 | return 1; | |
938 | } | |
5260325f | 939 | |
396c147e | 940 | static void |
c8e9c167 | 941 | channel_pre_x11_open_13(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 942 | { |
8e7895b8 | 943 | int ret = x11_open_helper(&c->output); |
e1feb9bf | 944 | |
7368a6c8 | 945 | if (ret == 1) { |
946 | /* Start normal processing for the channel. */ | |
947 | c->type = SSH_CHANNEL_OPEN; | |
a8be9f80 | 948 | channel_pre_open_13(c, readset, writeset); |
7368a6c8 | 949 | } else if (ret == -1) { |
950 | /* | |
951 | * We have received an X11 connection that has bad | |
952 | * authentication information. | |
953 | */ | |
bbe88b6d | 954 | logit("X11 connection rejected because of wrong authentication."); |
7368a6c8 | 955 | buffer_clear(&c->input); |
956 | buffer_clear(&c->output); | |
489aa2e9 | 957 | channel_close_fd(&c->sock); |
7368a6c8 | 958 | c->sock = -1; |
959 | c->type = SSH_CHANNEL_CLOSED; | |
960 | packet_start(SSH_MSG_CHANNEL_CLOSE); | |
961 | packet_put_int(c->remote_id); | |
962 | packet_send(); | |
963 | } | |
964 | } | |
5260325f | 965 | |
396c147e | 966 | static void |
c8e9c167 | 967 | channel_pre_x11_open(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 968 | { |
8e7895b8 | 969 | int ret = x11_open_helper(&c->output); |
a5f82435 | 970 | |
971 | /* c->force_drain = 1; */ | |
972 | ||
7368a6c8 | 973 | if (ret == 1) { |
974 | c->type = SSH_CHANNEL_OPEN; | |
0c0738d5 | 975 | channel_pre_open(c, readset, writeset); |
7368a6c8 | 976 | } else if (ret == -1) { |
bbe88b6d | 977 | logit("X11 connection rejected because of wrong authentication."); |
d7ac5f18 | 978 | debug2("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate); |
8341f420 | 979 | chan_read_failed(c); |
980 | buffer_clear(&c->input); | |
981 | chan_ibuf_empty(c); | |
982 | buffer_clear(&c->output); | |
983 | /* for proto v1, the peer will send an IEOF */ | |
984 | if (compat20) | |
985 | chan_write_failed(c); | |
986 | else | |
987 | c->type = SSH_CHANNEL_OPEN; | |
d7ac5f18 | 988 | debug2("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate); |
7368a6c8 | 989 | } |
990 | } | |
5260325f | 991 | |
28b9cb4d | 992 | /* try to decode a socks4 header */ |
ebb90778 | 993 | /* ARGSUSED */ |
396c147e | 994 | static int |
c8e9c167 | 995 | channel_decode_socks4(Channel *c, fd_set *readset, fd_set *writeset) |
0490e609 | 996 | { |
661e45a0 | 997 | char *p, *host; |
4866a6d6 | 998 | u_int len, have, i, found, need; |
184eed6a | 999 | char username[256]; |
0490e609 | 1000 | struct { |
1001 | u_int8_t version; | |
1002 | u_int8_t command; | |
1003 | u_int16_t dest_port; | |
28b9cb4d | 1004 | struct in_addr dest_addr; |
0490e609 | 1005 | } s4_req, s4_rsp; |
1006 | ||
28b9cb4d | 1007 | debug2("channel %d: decode socks4", c->self); |
53b8fe68 | 1008 | |
1009 | have = buffer_len(&c->input); | |
1010 | len = sizeof(s4_req); | |
1011 | if (have < len) | |
1012 | return 0; | |
1013 | p = buffer_ptr(&c->input); | |
4866a6d6 | 1014 | |
1015 | need = 1; | |
1016 | /* SOCKS4A uses an invalid IP address 0.0.0.x */ | |
1017 | if (p[4] == 0 && p[5] == 0 && p[6] == 0 && p[7] != 0) { | |
1018 | debug2("channel %d: socks4a request", c->self); | |
1019 | /* ... and needs an extra string (the hostname) */ | |
1020 | need = 2; | |
1021 | } | |
1022 | /* Check for terminating NUL on the string(s) */ | |
53b8fe68 | 1023 | for (found = 0, i = len; i < have; i++) { |
1024 | if (p[i] == '\0') { | |
4866a6d6 | 1025 | found++; |
1026 | if (found == need) | |
1027 | break; | |
53b8fe68 | 1028 | } |
1029 | if (i > 1024) { | |
1030 | /* the peer is probably sending garbage */ | |
1031 | debug("channel %d: decode socks4: too long", | |
1032 | c->self); | |
1033 | return -1; | |
1034 | } | |
1035 | } | |
4866a6d6 | 1036 | if (found < need) |
53b8fe68 | 1037 | return 0; |
0490e609 | 1038 | buffer_get(&c->input, (char *)&s4_req.version, 1); |
1039 | buffer_get(&c->input, (char *)&s4_req.command, 1); | |
1040 | buffer_get(&c->input, (char *)&s4_req.dest_port, 2); | |
28b9cb4d | 1041 | buffer_get(&c->input, (char *)&s4_req.dest_addr, 4); |
53b8fe68 | 1042 | have = buffer_len(&c->input); |
0490e609 | 1043 | p = buffer_ptr(&c->input); |
1044 | len = strlen(p); | |
6683b40f | 1045 | debug2("channel %d: decode socks4: user %s/%d", c->self, p, len); |
4866a6d6 | 1046 | len++; /* trailing '\0' */ |
0490e609 | 1047 | if (len > have) |
28b9cb4d | 1048 | fatal("channel %d: decode socks4: len %d > have %d", |
0490e609 | 1049 | c->self, len, have); |
1050 | strlcpy(username, p, sizeof(username)); | |
1051 | buffer_consume(&c->input, len); | |
0490e609 | 1052 | |
1338ba77 | 1053 | if (c->path != NULL) { |
1054 | xfree(c->path); | |
1055 | c->path = NULL; | |
1056 | } | |
4866a6d6 | 1057 | if (need == 1) { /* SOCKS4: one string */ |
1058 | host = inet_ntoa(s4_req.dest_addr); | |
1338ba77 | 1059 | c->path = xstrdup(host); |
4866a6d6 | 1060 | } else { /* SOCKS4A: two strings */ |
1061 | have = buffer_len(&c->input); | |
1062 | p = buffer_ptr(&c->input); | |
1063 | len = strlen(p); | |
1064 | debug2("channel %d: decode socks4a: host %s/%d", | |
1065 | c->self, p, len); | |
1066 | len++; /* trailing '\0' */ | |
1067 | if (len > have) | |
1068 | fatal("channel %d: decode socks4a: len %d > have %d", | |
1069 | c->self, len, have); | |
1338ba77 | 1070 | if (len > NI_MAXHOST) { |
4866a6d6 | 1071 | error("channel %d: hostname \"%.100s\" too long", |
1072 | c->self, p); | |
1073 | return -1; | |
1074 | } | |
1338ba77 | 1075 | c->path = xstrdup(p); |
4866a6d6 | 1076 | buffer_consume(&c->input, len); |
1077 | } | |
0490e609 | 1078 | c->host_port = ntohs(s4_req.dest_port); |
184eed6a | 1079 | |
d7ac5f18 | 1080 | debug2("channel %d: dynamic request: socks4 host %s port %u command %u", |
4866a6d6 | 1081 | c->self, c->path, c->host_port, s4_req.command); |
0490e609 | 1082 | |
28b9cb4d | 1083 | if (s4_req.command != 1) { |
4866a6d6 | 1084 | debug("channel %d: cannot handle: %s cn %d", |
1085 | c->self, need == 1 ? "SOCKS4" : "SOCKS4A", s4_req.command); | |
28b9cb4d | 1086 | return -1; |
0490e609 | 1087 | } |
28b9cb4d | 1088 | s4_rsp.version = 0; /* vn: 0 for reply */ |
1089 | s4_rsp.command = 90; /* cd: req granted */ | |
0490e609 | 1090 | s4_rsp.dest_port = 0; /* ignored */ |
28b9cb4d | 1091 | s4_rsp.dest_addr.s_addr = INADDR_ANY; /* ignored */ |
15dd2c4f | 1092 | buffer_append(&c->output, &s4_rsp, sizeof(s4_rsp)); |
28b9cb4d | 1093 | return 1; |
0490e609 | 1094 | } |
1095 | ||
f49658f5 | 1096 | /* try to decode a socks5 header */ |
1097 | #define SSH_SOCKS5_AUTHDONE 0x1000 | |
1098 | #define SSH_SOCKS5_NOAUTH 0x00 | |
1099 | #define SSH_SOCKS5_IPV4 0x01 | |
1100 | #define SSH_SOCKS5_DOMAIN 0x03 | |
1101 | #define SSH_SOCKS5_IPV6 0x04 | |
1102 | #define SSH_SOCKS5_CONNECT 0x01 | |
1103 | #define SSH_SOCKS5_SUCCESS 0x00 | |
1104 | ||
ebb90778 | 1105 | /* ARGSUSED */ |
f49658f5 | 1106 | static int |
c8e9c167 | 1107 | channel_decode_socks5(Channel *c, fd_set *readset, fd_set *writeset) |
f49658f5 | 1108 | { |
1109 | struct { | |
1110 | u_int8_t version; | |
1111 | u_int8_t command; | |
1112 | u_int8_t reserved; | |
1113 | u_int8_t atyp; | |
1114 | } s5_req, s5_rsp; | |
1115 | u_int16_t dest_port; | |
1338ba77 | 1116 | u_char *p, dest_addr[255+1], ntop[INET6_ADDRSTRLEN]; |
a217e418 | 1117 | u_int have, need, i, found, nmethods, addrlen, af; |
f49658f5 | 1118 | |
1119 | debug2("channel %d: decode socks5", c->self); | |
1120 | p = buffer_ptr(&c->input); | |
1121 | if (p[0] != 0x05) | |
1122 | return -1; | |
1123 | have = buffer_len(&c->input); | |
1124 | if (!(c->flags & SSH_SOCKS5_AUTHDONE)) { | |
1125 | /* format: ver | nmethods | methods */ | |
aff51935 | 1126 | if (have < 2) |
f49658f5 | 1127 | return 0; |
1128 | nmethods = p[1]; | |
1129 | if (have < nmethods + 2) | |
1130 | return 0; | |
1131 | /* look for method: "NO AUTHENTICATION REQUIRED" */ | |
4f6e2ba9 | 1132 | for (found = 0, i = 2; i < nmethods + 2; i++) { |
d4f40d92 | 1133 | if (p[i] == SSH_SOCKS5_NOAUTH) { |
f49658f5 | 1134 | found = 1; |
1135 | break; | |
1136 | } | |
1137 | } | |
1138 | if (!found) { | |
1139 | debug("channel %d: method SSH_SOCKS5_NOAUTH not found", | |
1140 | c->self); | |
1141 | return -1; | |
1142 | } | |
1143 | buffer_consume(&c->input, nmethods + 2); | |
1144 | buffer_put_char(&c->output, 0x05); /* version */ | |
1145 | buffer_put_char(&c->output, SSH_SOCKS5_NOAUTH); /* method */ | |
1146 | FD_SET(c->sock, writeset); | |
1147 | c->flags |= SSH_SOCKS5_AUTHDONE; | |
1148 | debug2("channel %d: socks5 auth done", c->self); | |
1149 | return 0; /* need more */ | |
1150 | } | |
1151 | debug2("channel %d: socks5 post auth", c->self); | |
1152 | if (have < sizeof(s5_req)+1) | |
1153 | return 0; /* need more */ | |
5b5f6af7 | 1154 | memcpy(&s5_req, p, sizeof(s5_req)); |
f49658f5 | 1155 | if (s5_req.version != 0x05 || |
1156 | s5_req.command != SSH_SOCKS5_CONNECT || | |
1157 | s5_req.reserved != 0x00) { | |
d7ac5f18 | 1158 | debug2("channel %d: only socks5 connect supported", c->self); |
f49658f5 | 1159 | return -1; |
1160 | } | |
f8cc7664 | 1161 | switch (s5_req.atyp){ |
f49658f5 | 1162 | case SSH_SOCKS5_IPV4: |
1163 | addrlen = 4; | |
1164 | af = AF_INET; | |
1165 | break; | |
1166 | case SSH_SOCKS5_DOMAIN: | |
1167 | addrlen = p[sizeof(s5_req)]; | |
1168 | af = -1; | |
1169 | break; | |
1170 | case SSH_SOCKS5_IPV6: | |
1171 | addrlen = 16; | |
1172 | af = AF_INET6; | |
1173 | break; | |
1174 | default: | |
d7ac5f18 | 1175 | debug2("channel %d: bad socks5 atyp %d", c->self, s5_req.atyp); |
f49658f5 | 1176 | return -1; |
1177 | } | |
a217e418 | 1178 | need = sizeof(s5_req) + addrlen + 2; |
1179 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) | |
1180 | need++; | |
1181 | if (have < need) | |
f49658f5 | 1182 | return 0; |
1183 | buffer_consume(&c->input, sizeof(s5_req)); | |
1184 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) | |
1185 | buffer_consume(&c->input, 1); /* host string length */ | |
1186 | buffer_get(&c->input, (char *)&dest_addr, addrlen); | |
1187 | buffer_get(&c->input, (char *)&dest_port, 2); | |
1188 | dest_addr[addrlen] = '\0'; | |
1338ba77 | 1189 | if (c->path != NULL) { |
1190 | xfree(c->path); | |
1191 | c->path = NULL; | |
1192 | } | |
1193 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) { | |
920706fd | 1194 | if (addrlen >= NI_MAXHOST) { |
1338ba77 | 1195 | error("channel %d: dynamic request: socks5 hostname " |
1196 | "\"%.100s\" too long", c->self, dest_addr); | |
1197 | return -1; | |
1198 | } | |
1199 | c->path = xstrdup(dest_addr); | |
1200 | } else { | |
1201 | if (inet_ntop(af, dest_addr, ntop, sizeof(ntop)) == NULL) | |
1202 | return -1; | |
1203 | c->path = xstrdup(ntop); | |
1204 | } | |
f49658f5 | 1205 | c->host_port = ntohs(dest_port); |
b6453d99 | 1206 | |
d7ac5f18 | 1207 | debug2("channel %d: dynamic request: socks5 host %s port %u command %u", |
f49658f5 | 1208 | c->self, c->path, c->host_port, s5_req.command); |
1209 | ||
1210 | s5_rsp.version = 0x05; | |
1211 | s5_rsp.command = SSH_SOCKS5_SUCCESS; | |
1212 | s5_rsp.reserved = 0; /* ignored */ | |
1213 | s5_rsp.atyp = SSH_SOCKS5_IPV4; | |
1214 | ((struct in_addr *)&dest_addr)->s_addr = INADDR_ANY; | |
1215 | dest_port = 0; /* ignored */ | |
1216 | ||
15dd2c4f | 1217 | buffer_append(&c->output, &s5_rsp, sizeof(s5_rsp)); |
1218 | buffer_append(&c->output, &dest_addr, sizeof(struct in_addr)); | |
1219 | buffer_append(&c->output, &dest_port, sizeof(dest_port)); | |
f49658f5 | 1220 | return 1; |
1221 | } | |
1222 | ||
28b9cb4d | 1223 | /* dynamic port forwarding */ |
396c147e | 1224 | static void |
c8e9c167 | 1225 | channel_pre_dynamic(Channel *c, fd_set *readset, fd_set *writeset) |
28b9cb4d | 1226 | { |
1227 | u_char *p; | |
2ceb8101 | 1228 | u_int have; |
1229 | int ret; | |
28b9cb4d | 1230 | |
1231 | have = buffer_len(&c->input); | |
28b9cb4d | 1232 | debug2("channel %d: pre_dynamic: have %d", c->self, have); |
070adba2 | 1233 | /* buffer_dump(&c->input); */ |
28b9cb4d | 1234 | /* check if the fixed size part of the packet is in buffer. */ |
f49658f5 | 1235 | if (have < 3) { |
28b9cb4d | 1236 | /* need more */ |
1237 | FD_SET(c->sock, readset); | |
1238 | return; | |
1239 | } | |
1240 | /* try to guess the protocol */ | |
1241 | p = buffer_ptr(&c->input); | |
1242 | switch (p[0]) { | |
6683b40f | 1243 | case 0x04: |
1244 | ret = channel_decode_socks4(c, readset, writeset); | |
1245 | break; | |
f49658f5 | 1246 | case 0x05: |
1247 | ret = channel_decode_socks5(c, readset, writeset); | |
1248 | break; | |
28b9cb4d | 1249 | default: |
1250 | ret = -1; | |
1251 | break; | |
1252 | } | |
1253 | if (ret < 0) { | |
719fc62f | 1254 | chan_mark_dead(c); |
28b9cb4d | 1255 | } else if (ret == 0) { |
1256 | debug2("channel %d: pre_dynamic: need more", c->self); | |
1257 | /* need more */ | |
1258 | FD_SET(c->sock, readset); | |
1259 | } else { | |
1260 | /* switch to the next state */ | |
1261 | c->type = SSH_CHANNEL_OPENING; | |
1262 | port_open_helper(c, "direct-tcpip"); | |
1263 | } | |
1264 | } | |
0490e609 | 1265 | |
7368a6c8 | 1266 | /* This is our fake X11 server socket. */ |
ebb90778 | 1267 | /* ARGSUSED */ |
396c147e | 1268 | static void |
c8e9c167 | 1269 | channel_post_x11_listener(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1270 | { |
719fc62f | 1271 | Channel *nc; |
9fb764ab | 1272 | struct sockaddr_storage addr; |
bcc0381e | 1273 | int newsock; |
7368a6c8 | 1274 | socklen_t addrlen; |
865ac82e | 1275 | char buf[16384], *remote_ipaddr; |
0b242b12 | 1276 | int remote_port; |
7368a6c8 | 1277 | |
1278 | if (FD_ISSET(c->sock, readset)) { | |
1279 | debug("X11 connection requested."); | |
1280 | addrlen = sizeof(addr); | |
9fb764ab | 1281 | newsock = accept(c->sock, (struct sockaddr *)&addr, &addrlen); |
ac151b18 | 1282 | if (c->single_connection) { |
d7ac5f18 | 1283 | debug2("single_connection: closing X11 listener."); |
ac151b18 | 1284 | channel_close_fd(&c->sock); |
1285 | chan_mark_dead(c); | |
1286 | } | |
7368a6c8 | 1287 | if (newsock < 0) { |
1288 | error("accept: %.100s", strerror(errno)); | |
1289 | return; | |
5260325f | 1290 | } |
bcc0381e | 1291 | set_nodelay(newsock); |
865ac82e | 1292 | remote_ipaddr = get_peer_ipaddr(newsock); |
0b242b12 | 1293 | remote_port = get_peer_port(newsock); |
7368a6c8 | 1294 | snprintf(buf, sizeof buf, "X11 connection from %.200s port %d", |
865ac82e | 1295 | remote_ipaddr, remote_port); |
0b242b12 | 1296 | |
719fc62f | 1297 | nc = channel_new("accepted x11 socket", |
0b242b12 | 1298 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
0d942eff | 1299 | c->local_window_max, c->local_maxpacket, 0, buf, 1); |
0b242b12 | 1300 | if (compat20) { |
1301 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1302 | packet_put_cstring("x11"); | |
719fc62f | 1303 | packet_put_int(nc->self); |
ac151b18 | 1304 | packet_put_int(nc->local_window_max); |
1305 | packet_put_int(nc->local_maxpacket); | |
865ac82e | 1306 | /* originator ipaddr and port */ |
1307 | packet_put_cstring(remote_ipaddr); | |
d0c832f3 | 1308 | if (datafellows & SSH_BUG_X11FWD) { |
d7ac5f18 | 1309 | debug2("ssh2 x11 bug compat mode"); |
d0c832f3 | 1310 | } else { |
1311 | packet_put_int(remote_port); | |
1312 | } | |
0b242b12 | 1313 | packet_send(); |
1314 | } else { | |
1315 | packet_start(SSH_SMSG_X11_OPEN); | |
719fc62f | 1316 | packet_put_int(nc->self); |
8e7895b8 | 1317 | if (packet_get_protocol_flags() & |
1318 | SSH_PROTOFLAG_HOST_IN_FWD_OPEN) | |
449c5ba5 | 1319 | packet_put_cstring(buf); |
0b242b12 | 1320 | packet_send(); |
1321 | } | |
865ac82e | 1322 | xfree(remote_ipaddr); |
8efc0c15 | 1323 | } |
8efc0c15 | 1324 | } |
1325 | ||
396c147e | 1326 | static void |
0490e609 | 1327 | port_open_helper(Channel *c, char *rtype) |
1328 | { | |
1329 | int direct; | |
1330 | char buf[1024]; | |
1331 | char *remote_ipaddr = get_peer_ipaddr(c->sock); | |
29798ed0 | 1332 | int remote_port = get_peer_port(c->sock); |
0490e609 | 1333 | |
1334 | direct = (strcmp(rtype, "direct-tcpip") == 0); | |
1335 | ||
1336 | snprintf(buf, sizeof buf, | |
1337 | "%s: listening port %d for %.100s port %d, " | |
1338 | "connect from %.200s port %d", | |
1339 | rtype, c->listening_port, c->path, c->host_port, | |
1340 | remote_ipaddr, remote_port); | |
1341 | ||
1342 | xfree(c->remote_name); | |
1343 | c->remote_name = xstrdup(buf); | |
1344 | ||
1345 | if (compat20) { | |
1346 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1347 | packet_put_cstring(rtype); | |
1348 | packet_put_int(c->self); | |
1349 | packet_put_int(c->local_window_max); | |
1350 | packet_put_int(c->local_maxpacket); | |
1351 | if (direct) { | |
1352 | /* target host, port */ | |
1353 | packet_put_cstring(c->path); | |
1354 | packet_put_int(c->host_port); | |
1355 | } else { | |
1356 | /* listen address, port */ | |
1357 | packet_put_cstring(c->path); | |
1358 | packet_put_int(c->listening_port); | |
1359 | } | |
1360 | /* originator host and port */ | |
1361 | packet_put_cstring(remote_ipaddr); | |
29798ed0 | 1362 | packet_put_int((u_int)remote_port); |
0490e609 | 1363 | packet_send(); |
1364 | } else { | |
1365 | packet_start(SSH_MSG_PORT_OPEN); | |
1366 | packet_put_int(c->self); | |
1367 | packet_put_cstring(c->path); | |
1368 | packet_put_int(c->host_port); | |
8e7895b8 | 1369 | if (packet_get_protocol_flags() & |
1370 | SSH_PROTOFLAG_HOST_IN_FWD_OPEN) | |
0490e609 | 1371 | packet_put_cstring(c->remote_name); |
1372 | packet_send(); | |
1373 | } | |
1374 | xfree(remote_ipaddr); | |
1375 | } | |
1376 | ||
442aee3a | 1377 | static void |
1378 | channel_set_reuseaddr(int fd) | |
1379 | { | |
1380 | int on = 1; | |
1381 | ||
1382 | /* | |
1383 | * Set socket options. | |
1384 | * Allow local port reuse in TIME_WAIT. | |
1385 | */ | |
1386 | if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1) | |
1387 | error("setsockopt SO_REUSEADDR fd %d: %s", fd, strerror(errno)); | |
1388 | } | |
1389 | ||
aa3378df | 1390 | /* |
7368a6c8 | 1391 | * This socket is listening for connections to a forwarded TCP/IP port. |
aa3378df | 1392 | */ |
ebb90778 | 1393 | /* ARGSUSED */ |
396c147e | 1394 | static void |
c8e9c167 | 1395 | channel_post_port_listener(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1396 | { |
0490e609 | 1397 | Channel *nc; |
9fb764ab | 1398 | struct sockaddr_storage addr; |
719fc62f | 1399 | int newsock, nextstate; |
7368a6c8 | 1400 | socklen_t addrlen; |
0490e609 | 1401 | char *rtype; |
fa08c86b | 1402 | |
7368a6c8 | 1403 | if (FD_ISSET(c->sock, readset)) { |
1404 | debug("Connection to port %d forwarding " | |
1405 | "to %.100s port %d requested.", | |
1406 | c->listening_port, c->path, c->host_port); | |
0490e609 | 1407 | |
639cb8ab | 1408 | if (c->type == SSH_CHANNEL_RPORT_LISTENER) { |
1409 | nextstate = SSH_CHANNEL_OPENING; | |
1410 | rtype = "forwarded-tcpip"; | |
1411 | } else { | |
1412 | if (c->host_port == 0) { | |
1413 | nextstate = SSH_CHANNEL_DYNAMIC; | |
f3964cb9 | 1414 | rtype = "dynamic-tcpip"; |
639cb8ab | 1415 | } else { |
1416 | nextstate = SSH_CHANNEL_OPENING; | |
1417 | rtype = "direct-tcpip"; | |
1418 | } | |
1419 | } | |
0490e609 | 1420 | |
7368a6c8 | 1421 | addrlen = sizeof(addr); |
9fb764ab | 1422 | newsock = accept(c->sock, (struct sockaddr *)&addr, &addrlen); |
7368a6c8 | 1423 | if (newsock < 0) { |
1424 | error("accept: %.100s", strerror(errno)); | |
1425 | return; | |
1426 | } | |
811a6342 | 1427 | set_nodelay(newsock); |
0d942eff | 1428 | nc = channel_new(rtype, nextstate, newsock, newsock, -1, |
1429 | c->local_window_max, c->local_maxpacket, 0, rtype, 1); | |
0490e609 | 1430 | nc->listening_port = c->listening_port; |
1431 | nc->host_port = c->host_port; | |
1338ba77 | 1432 | if (c->path != NULL) |
1433 | nc->path = xstrdup(c->path); | |
0490e609 | 1434 | |
7501ed0d | 1435 | if (nextstate != SSH_CHANNEL_DYNAMIC) |
0490e609 | 1436 | port_open_helper(nc, rtype); |
7368a6c8 | 1437 | } |
1438 | } | |
8efc0c15 | 1439 | |
7368a6c8 | 1440 | /* |
1441 | * This is the authentication agent socket listening for connections from | |
1442 | * clients. | |
1443 | */ | |
ebb90778 | 1444 | /* ARGSUSED */ |
396c147e | 1445 | static void |
c8e9c167 | 1446 | channel_post_auth_listener(Channel *c, fd_set *readset, fd_set *writeset) |
8efc0c15 | 1447 | { |
719fc62f | 1448 | Channel *nc; |
1449 | int newsock; | |
9fb764ab | 1450 | struct sockaddr_storage addr; |
48e671d5 | 1451 | socklen_t addrlen; |
5260325f | 1452 | |
7368a6c8 | 1453 | if (FD_ISSET(c->sock, readset)) { |
1454 | addrlen = sizeof(addr); | |
9fb764ab | 1455 | newsock = accept(c->sock, (struct sockaddr *)&addr, &addrlen); |
7368a6c8 | 1456 | if (newsock < 0) { |
1457 | error("accept from auth socket: %.100s", strerror(errno)); | |
1458 | return; | |
1459 | } | |
719fc62f | 1460 | nc = channel_new("accepted auth socket", |
fa08c86b | 1461 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
1462 | c->local_window_max, c->local_maxpacket, | |
0d942eff | 1463 | 0, "accepted auth socket", 1); |
fa08c86b | 1464 | if (compat20) { |
1465 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1466 | packet_put_cstring("auth-agent@openssh.com"); | |
719fc62f | 1467 | packet_put_int(nc->self); |
fa08c86b | 1468 | packet_put_int(c->local_window_max); |
1469 | packet_put_int(c->local_maxpacket); | |
1470 | } else { | |
1471 | packet_start(SSH_SMSG_AGENT_OPEN); | |
719fc62f | 1472 | packet_put_int(nc->self); |
fa08c86b | 1473 | } |
7368a6c8 | 1474 | packet_send(); |
1475 | } | |
1476 | } | |
5260325f | 1477 | |
ebb90778 | 1478 | /* ARGSUSED */ |
396c147e | 1479 | static void |
c8e9c167 | 1480 | channel_post_connecting(Channel *c, fd_set *readset, fd_set *writeset) |
97fb6912 | 1481 | { |
e07e21ad | 1482 | int err = 0, sock; |
8ab2cb35 | 1483 | socklen_t sz = sizeof(err); |
d18e0850 | 1484 | |
97fb6912 | 1485 | if (FD_ISSET(c->sock, writeset)) { |
db518d9b | 1486 | if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, &err, &sz) < 0) { |
d18e0850 | 1487 | err = errno; |
1488 | error("getsockopt SO_ERROR failed"); | |
1489 | } | |
1490 | if (err == 0) { | |
e07e21ad | 1491 | debug("channel %d: connected to %s port %d", |
1492 | c->self, c->connect_ctx.host, c->connect_ctx.port); | |
1493 | channel_connect_ctx_free(&c->connect_ctx); | |
d18e0850 | 1494 | c->type = SSH_CHANNEL_OPEN; |
1495 | if (compat20) { | |
1496 | packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1497 | packet_put_int(c->remote_id); | |
1498 | packet_put_int(c->self); | |
1499 | packet_put_int(c->local_window); | |
1500 | packet_put_int(c->local_maxpacket); | |
1501 | } else { | |
1502 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1503 | packet_put_int(c->remote_id); | |
1504 | packet_put_int(c->self); | |
1505 | } | |
97fb6912 | 1506 | } else { |
e07e21ad | 1507 | debug("channel %d: connection failed: %s", |
d18e0850 | 1508 | c->self, strerror(err)); |
e07e21ad | 1509 | /* Try next address, if any */ |
1510 | if ((sock = connect_next(&c->connect_ctx)) > 0) { | |
1511 | close(c->sock); | |
1512 | c->sock = c->rfd = c->wfd = sock; | |
1513 | channel_max_fd = channel_find_maxfd(); | |
1514 | return; | |
1515 | } | |
1516 | /* Exhausted all addresses */ | |
1517 | error("connect_to %.100s port %d: failed.", | |
1518 | c->connect_ctx.host, c->connect_ctx.port); | |
1519 | channel_connect_ctx_free(&c->connect_ctx); | |
d18e0850 | 1520 | if (compat20) { |
1521 | packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); | |
1522 | packet_put_int(c->remote_id); | |
1523 | packet_put_int(SSH2_OPEN_CONNECT_FAILED); | |
1524 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { | |
1525 | packet_put_cstring(strerror(err)); | |
1526 | packet_put_cstring(""); | |
1527 | } | |
97fb6912 | 1528 | } else { |
d18e0850 | 1529 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
1530 | packet_put_int(c->remote_id); | |
97fb6912 | 1531 | } |
d18e0850 | 1532 | chan_mark_dead(c); |
97fb6912 | 1533 | } |
d18e0850 | 1534 | packet_send(); |
97fb6912 | 1535 | } |
1536 | } | |
1537 | ||
ebb90778 | 1538 | /* ARGSUSED */ |
396c147e | 1539 | static int |
c8e9c167 | 1540 | channel_handle_rfd(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1541 | { |
fa1d7d85 | 1542 | char buf[CHAN_RBUF]; |
bd6a1355 | 1543 | int len, force; |
7368a6c8 | 1544 | |
bd6a1355 | 1545 | force = c->isatty && c->detach_close && c->istate != CHAN_INPUT_CLOSED; |
1546 | if (c->rfd != -1 && (force || FD_ISSET(c->rfd, readset))) { | |
ea8c44d9 | 1547 | errno = 0; |
7368a6c8 | 1548 | len = read(c->rfd, buf, sizeof(buf)); |
5a0c8771 | 1549 | if (len < 0 && (errno == EINTR || |
1550 | ((errno == EAGAIN || errno == EWOULDBLOCK) && !force))) | |
0fbe8c74 | 1551 | return 1; |
ea8c44d9 | 1552 | #ifndef PTY_ZEROREAD |
7368a6c8 | 1553 | if (len <= 0) { |
ea8c44d9 | 1554 | #else |
9c04d67d | 1555 | if ((!c->isatty && len <= 0) || |
1556 | (c->isatty && (len < 0 || (len == 0 && errno != 0)))) { | |
ea8c44d9 | 1557 | #endif |
d7ac5f18 | 1558 | debug2("channel %d: read<=0 rfd %d len %d", |
7368a6c8 | 1559 | c->self, c->rfd, len); |
28b9cb4d | 1560 | if (c->type != SSH_CHANNEL_OPEN) { |
d7ac5f18 | 1561 | debug2("channel %d: not open", c->self); |
719fc62f | 1562 | chan_mark_dead(c); |
0490e609 | 1563 | return -1; |
28b9cb4d | 1564 | } else if (compat13) { |
9c50edcf | 1565 | buffer_clear(&c->output); |
7368a6c8 | 1566 | c->type = SSH_CHANNEL_INPUT_DRAINING; |
d7ac5f18 | 1567 | debug2("channel %d: input draining.", c->self); |
7368a6c8 | 1568 | } else { |
1569 | chan_read_failed(c); | |
5260325f | 1570 | } |
7368a6c8 | 1571 | return -1; |
1572 | } | |
6aacefa7 | 1573 | if (c->input_filter != NULL) { |
2e73a022 | 1574 | if (c->input_filter(c, buf, len) == -1) { |
d7ac5f18 | 1575 | debug2("channel %d: filter stops", c->self); |
2e73a022 | 1576 | chan_read_failed(c); |
1577 | } | |
d20f3c9e | 1578 | } else if (c->datagram) { |
1579 | buffer_put_string(&c->input, buf, len); | |
2e73a022 | 1580 | } else { |
1581 | buffer_append(&c->input, buf, len); | |
1582 | } | |
7368a6c8 | 1583 | } |
1584 | return 1; | |
1585 | } | |
a7137f6b | 1586 | |
ebb90778 | 1587 | /* ARGSUSED */ |
396c147e | 1588 | static int |
c8e9c167 | 1589 | channel_handle_wfd(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1590 | { |
95ce5599 | 1591 | struct termios tio; |
c1c6a032 | 1592 | u_char *data = NULL, *buf; |
780a9951 | 1593 | u_int dlen; |
7368a6c8 | 1594 | int len; |
1595 | ||
1596 | /* Send buffered output data to the socket. */ | |
6fd8622b | 1597 | if (c->wfd != -1 && |
7368a6c8 | 1598 | FD_ISSET(c->wfd, writeset) && |
1599 | buffer_len(&c->output) > 0) { | |
c1c6a032 | 1600 | if (c->output_filter != NULL) { |
1601 | if ((buf = c->output_filter(c, &data, &dlen)) == NULL) { | |
1602 | debug2("channel %d: filter stops", c->self); | |
d7b37427 | 1603 | if (c->type != SSH_CHANNEL_OPEN) |
1604 | chan_mark_dead(c); | |
1605 | else | |
1606 | chan_write_failed(c); | |
1607 | return -1; | |
c1c6a032 | 1608 | } |
1609 | } else if (c->datagram) { | |
1610 | buf = data = buffer_get_string(&c->output, &dlen); | |
1611 | } else { | |
1612 | buf = data = buffer_ptr(&c->output); | |
1613 | dlen = buffer_len(&c->output); | |
1614 | } | |
1615 | ||
d20f3c9e | 1616 | if (c->datagram) { |
d20f3c9e | 1617 | /* ignore truncated writes, datagrams might get lost */ |
1618 | c->local_consumed += dlen + 4; | |
c1c6a032 | 1619 | len = write(c->wfd, buf, dlen); |
d20f3c9e | 1620 | xfree(data); |
5a0c8771 | 1621 | if (len < 0 && (errno == EINTR || errno == EAGAIN || |
1622 | errno == EWOULDBLOCK)) | |
d20f3c9e | 1623 | return 1; |
1624 | if (len <= 0) { | |
1625 | if (c->type != SSH_CHANNEL_OPEN) | |
1626 | chan_mark_dead(c); | |
1627 | else | |
1628 | chan_write_failed(c); | |
1629 | return -1; | |
1630 | } | |
1631 | return 1; | |
1632 | } | |
64c0ce80 | 1633 | #ifdef _AIX |
aff51935 | 1634 | /* XXX: Later AIX versions can't push as much data to tty */ |
7fbb4189 | 1635 | if (compat20 && c->wfd_isatty) |
1636 | dlen = MIN(dlen, 8*1024); | |
64c0ce80 | 1637 | #endif |
c1c6a032 | 1638 | |
1639 | len = write(c->wfd, buf, dlen); | |
5a0c8771 | 1640 | if (len < 0 && |
1641 | (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK)) | |
0fbe8c74 | 1642 | return 1; |
7368a6c8 | 1643 | if (len <= 0) { |
28b9cb4d | 1644 | if (c->type != SSH_CHANNEL_OPEN) { |
d7ac5f18 | 1645 | debug2("channel %d: not open", c->self); |
719fc62f | 1646 | chan_mark_dead(c); |
28b9cb4d | 1647 | return -1; |
1648 | } else if (compat13) { | |
9c50edcf | 1649 | buffer_clear(&c->output); |
d7ac5f18 | 1650 | debug2("channel %d: input draining.", c->self); |
7368a6c8 | 1651 | c->type = SSH_CHANNEL_INPUT_DRAINING; |
1652 | } else { | |
1653 | chan_write_failed(c); | |
5260325f | 1654 | } |
7368a6c8 | 1655 | return -1; |
1656 | } | |
5e934f78 | 1657 | #ifndef BROKEN_TCGETATTR_ICANON |
c1c6a032 | 1658 | if (compat20 && c->isatty && dlen >= 1 && buf[0] != '\r') { |
0ae4fe1d | 1659 | if (tcgetattr(c->wfd, &tio) == 0 && |
1660 | !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) { | |
1661 | /* | |
1662 | * Simulate echo to reduce the impact of | |
355724fc | 1663 | * traffic analysis. We need to match the |
95ce5599 | 1664 | * size of a SSH2_MSG_CHANNEL_DATA message |
c1c6a032 | 1665 | * (4 byte channel id + buf) |
0ae4fe1d | 1666 | */ |
95ce5599 | 1667 | packet_send_ignore(4 + len); |
0ae4fe1d | 1668 | packet_send(); |
0ae4fe1d | 1669 | } |
1670 | } | |
5e934f78 | 1671 | #endif |
7368a6c8 | 1672 | buffer_consume(&c->output, len); |
7e7327a1 | 1673 | if (compat20 && len > 0) { |
1674 | c->local_consumed += len; | |
1675 | } | |
1676 | } | |
1677 | return 1; | |
1678 | } | |
a7137f6b | 1679 | |
396c147e | 1680 | static int |
c8e9c167 | 1681 | channel_handle_efd(Channel *c, fd_set *readset, fd_set *writeset) |
7e7327a1 | 1682 | { |
fa1d7d85 | 1683 | char buf[CHAN_RBUF]; |
7e7327a1 | 1684 | int len; |
1685 | ||
8ce64345 | 1686 | /** XXX handle drain efd, too */ |
7e7327a1 | 1687 | if (c->efd != -1) { |
1688 | if (c->extended_usage == CHAN_EXTENDED_WRITE && | |
1689 | FD_ISSET(c->efd, writeset) && | |
1690 | buffer_len(&c->extended) > 0) { | |
1691 | len = write(c->efd, buffer_ptr(&c->extended), | |
1692 | buffer_len(&c->extended)); | |
de273eef | 1693 | debug2("channel %d: written %d to efd %d", |
7e7327a1 | 1694 | c->self, len, c->efd); |
5a0c8771 | 1695 | if (len < 0 && (errno == EINTR || errno == EAGAIN || |
1696 | errno == EWOULDBLOCK)) | |
ee55dacf | 1697 | return 1; |
1698 | if (len <= 0) { | |
1699 | debug2("channel %d: closing write-efd %d", | |
1700 | c->self, c->efd); | |
489aa2e9 | 1701 | channel_close_fd(&c->efd); |
ee55dacf | 1702 | } else { |
7e7327a1 | 1703 | buffer_consume(&c->extended, len); |
1704 | c->local_consumed += len; | |
1705 | } | |
1706 | } else if (c->extended_usage == CHAN_EXTENDED_READ && | |
34640ce6 | 1707 | (c->detach_close || FD_ISSET(c->efd, readset))) { |
7e7327a1 | 1708 | len = read(c->efd, buf, sizeof(buf)); |
de273eef | 1709 | debug2("channel %d: read %d from efd %d", |
184eed6a | 1710 | c->self, len, c->efd); |
5a0c8771 | 1711 | if (len < 0 && (errno == EINTR || ((errno == EAGAIN || |
1712 | errno == EWOULDBLOCK) && !c->detach_close))) | |
ee55dacf | 1713 | return 1; |
1714 | if (len <= 0) { | |
1715 | debug2("channel %d: closing read-efd %d", | |
8ce64345 | 1716 | c->self, c->efd); |
489aa2e9 | 1717 | channel_close_fd(&c->efd); |
ee55dacf | 1718 | } else { |
7e7327a1 | 1719 | buffer_append(&c->extended, buf, len); |
ee55dacf | 1720 | } |
7e7327a1 | 1721 | } |
1722 | } | |
1723 | return 1; | |
1724 | } | |
a7137f6b | 1725 | |
ebb90778 | 1726 | /* ARGSUSED */ |
396c147e | 1727 | static int |
c8e9c167 | 1728 | channel_handle_ctl(Channel *c, fd_set *readset, fd_set *writeset) |
5e96b616 | 1729 | { |
1730 | char buf[16]; | |
1731 | int len; | |
1732 | ||
1733 | /* Monitor control fd to detect if the slave client exits */ | |
1734 | if (c->ctl_fd != -1 && FD_ISSET(c->ctl_fd, readset)) { | |
1735 | len = read(c->ctl_fd, buf, sizeof(buf)); | |
5a0c8771 | 1736 | if (len < 0 && |
1737 | (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK)) | |
5e96b616 | 1738 | return 1; |
1739 | if (len <= 0) { | |
1740 | debug2("channel %d: ctl read<=0", c->self); | |
1741 | if (c->type != SSH_CHANNEL_OPEN) { | |
1742 | debug2("channel %d: not open", c->self); | |
1743 | chan_mark_dead(c); | |
1744 | return -1; | |
1745 | } else { | |
1746 | chan_read_failed(c); | |
1747 | chan_write_failed(c); | |
1748 | } | |
1749 | return -1; | |
1750 | } else | |
1751 | fatal("%s: unexpected data on ctl fd", __func__); | |
1752 | } | |
1753 | return 1; | |
1754 | } | |
a7137f6b | 1755 | |
5e96b616 | 1756 | static int |
ee55dacf | 1757 | channel_check_window(Channel *c) |
7e7327a1 | 1758 | { |
28b9cb4d | 1759 | if (c->type == SSH_CHANNEL_OPEN && |
1760 | !(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) && | |
d9245683 | 1761 | ((c->local_window_max - c->local_window > |
68a73f53 | 1762 | c->local_maxpacket*3) || |
1763 | c->local_window < c->local_window_max/2) && | |
7e7327a1 | 1764 | c->local_consumed > 0) { |
1765 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); | |
1766 | packet_put_int(c->remote_id); | |
1767 | packet_put_int(c->local_consumed); | |
1768 | packet_send(); | |
de273eef | 1769 | debug2("channel %d: window %d sent adjust %d", |
7e7327a1 | 1770 | c->self, c->local_window, |
1771 | c->local_consumed); | |
1772 | c->local_window += c->local_consumed; | |
1773 | c->local_consumed = 0; | |
7368a6c8 | 1774 | } |
1775 | return 1; | |
1776 | } | |
5260325f | 1777 | |
396c147e | 1778 | static void |
c8e9c167 | 1779 | channel_post_open(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1780 | { |
1781 | channel_handle_rfd(c, readset, writeset); | |
1782 | channel_handle_wfd(c, readset, writeset); | |
0c0738d5 | 1783 | if (!compat20) |
639cb8ab | 1784 | return; |
7e7327a1 | 1785 | channel_handle_efd(c, readset, writeset); |
5e96b616 | 1786 | channel_handle_ctl(c, readset, writeset); |
ee55dacf | 1787 | channel_check_window(c); |
7e7327a1 | 1788 | } |
1789 | ||
ebb90778 | 1790 | /* ARGSUSED */ |
396c147e | 1791 | static void |
c8e9c167 | 1792 | channel_post_output_drain_13(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1793 | { |
1794 | int len; | |
e1feb9bf | 1795 | |
7368a6c8 | 1796 | /* Send buffered output data to the socket. */ |
1797 | if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) { | |
1798 | len = write(c->sock, buffer_ptr(&c->output), | |
1799 | buffer_len(&c->output)); | |
1800 | if (len <= 0) | |
9c50edcf | 1801 | buffer_clear(&c->output); |
7368a6c8 | 1802 | else |
1803 | buffer_consume(&c->output, len); | |
1804 | } | |
1805 | } | |
5260325f | 1806 | |
396c147e | 1807 | static void |
7e7327a1 | 1808 | channel_handler_init_20(void) |
1809 | { | |
0c0738d5 | 1810 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open; |
0b242b12 | 1811 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
7e7327a1 | 1812 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; |
fa08c86b | 1813 | channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener; |
0b242b12 | 1814 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
fa08c86b | 1815 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; |
97fb6912 | 1816 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1817 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7e7327a1 | 1818 | |
0c0738d5 | 1819 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
7e7327a1 | 1820 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; |
fa08c86b | 1821 | channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener; |
0b242b12 | 1822 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
fa08c86b | 1823 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; |
97fb6912 | 1824 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 1825 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
7e7327a1 | 1826 | } |
1827 | ||
396c147e | 1828 | static void |
7368a6c8 | 1829 | channel_handler_init_13(void) |
1830 | { | |
1831 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13; | |
1832 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_13; | |
1833 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; | |
1834 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; | |
1835 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; | |
1836 | channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining; | |
1837 | channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining; | |
97fb6912 | 1838 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1839 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7368a6c8 | 1840 | |
0c0738d5 | 1841 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
7368a6c8 | 1842 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
1843 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; | |
1844 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; | |
1845 | channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13; | |
97fb6912 | 1846 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 1847 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
7368a6c8 | 1848 | } |
5260325f | 1849 | |
396c147e | 1850 | static void |
7368a6c8 | 1851 | channel_handler_init_15(void) |
1852 | { | |
0c0738d5 | 1853 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open; |
0b242b12 | 1854 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
7368a6c8 | 1855 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
1856 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; | |
1857 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; | |
97fb6912 | 1858 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1859 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7368a6c8 | 1860 | |
1861 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; | |
1862 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; | |
1863 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; | |
0c0738d5 | 1864 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
97fb6912 | 1865 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 1866 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
7368a6c8 | 1867 | } |
1868 | ||
396c147e | 1869 | static void |
7368a6c8 | 1870 | channel_handler_init(void) |
1871 | { | |
1872 | int i; | |
e1feb9bf | 1873 | |
184eed6a | 1874 | for (i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) { |
7368a6c8 | 1875 | channel_pre[i] = NULL; |
1876 | channel_post[i] = NULL; | |
1877 | } | |
7e7327a1 | 1878 | if (compat20) |
1879 | channel_handler_init_20(); | |
1880 | else if (compat13) | |
7368a6c8 | 1881 | channel_handler_init_13(); |
1882 | else | |
1883 | channel_handler_init_15(); | |
1884 | } | |
1885 | ||
418e724c | 1886 | /* gc dead channels */ |
1887 | static void | |
1888 | channel_garbage_collect(Channel *c) | |
1889 | { | |
1890 | if (c == NULL) | |
1891 | return; | |
1892 | if (c->detach_user != NULL) { | |
8cd0437d | 1893 | if (!chan_is_dead(c, c->detach_close)) |
418e724c | 1894 | return; |
d7ac5f18 | 1895 | debug2("channel %d: gc: notify user", c->self); |
418e724c | 1896 | c->detach_user(c->self, NULL); |
1897 | /* if we still have a callback */ | |
1898 | if (c->detach_user != NULL) | |
1899 | return; | |
d7ac5f18 | 1900 | debug2("channel %d: gc: user detached", c->self); |
418e724c | 1901 | } |
1902 | if (!chan_is_dead(c, 1)) | |
1903 | return; | |
d7ac5f18 | 1904 | debug2("channel %d: garbage collecting", c->self); |
418e724c | 1905 | channel_free(c); |
1906 | } | |
1907 | ||
396c147e | 1908 | static void |
c8e9c167 | 1909 | channel_handler(chan_fn *ftab[], fd_set *readset, fd_set *writeset) |
7368a6c8 | 1910 | { |
1911 | static int did_init = 0; | |
7501ed0d | 1912 | u_int i, oalloc; |
7368a6c8 | 1913 | Channel *c; |
1914 | ||
1915 | if (!did_init) { | |
1916 | channel_handler_init(); | |
1917 | did_init = 1; | |
1918 | } | |
7501ed0d | 1919 | for (i = 0, oalloc = channels_alloc; i < oalloc; i++) { |
719fc62f | 1920 | c = channels[i]; |
1921 | if (c == NULL) | |
5260325f | 1922 | continue; |
7501ed0d | 1923 | if (c->delayed) { |
1924 | if (ftab == channel_pre) | |
1925 | c->delayed = 0; | |
1926 | else | |
1927 | continue; | |
1928 | } | |
6fd8622b | 1929 | if (ftab[c->type] != NULL) |
1930 | (*ftab[c->type])(c, readset, writeset); | |
418e724c | 1931 | channel_garbage_collect(c); |
8efc0c15 | 1932 | } |
8efc0c15 | 1933 | } |
1934 | ||
8e7895b8 | 1935 | /* |
1936 | * Allocate/update select bitmasks and add any bits relevant to channels in | |
1937 | * select bitmasks. | |
1938 | */ | |
6ae2364d | 1939 | void |
c422989b | 1940 | channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp, |
9a995072 | 1941 | u_int *nallocp, int rekeying) |
7368a6c8 | 1942 | { |
c5d10563 | 1943 | u_int n, sz, nfdset; |
39929cdb | 1944 | |
1945 | n = MAX(*maxfdp, channel_max_fd); | |
1946 | ||
c5d10563 | 1947 | nfdset = howmany(n+1, NFDBITS); |
1948 | /* Explicitly test here, because xrealloc isn't always called */ | |
1949 | if (nfdset && SIZE_T_MAX / nfdset < sizeof(fd_mask)) | |
1950 | fatal("channel_prepare_select: max_fd (%d) is too large", n); | |
1951 | sz = nfdset * sizeof(fd_mask); | |
1952 | ||
489aa2e9 | 1953 | /* perhaps check sz < nalloc/2 and shrink? */ |
1954 | if (*readsetp == NULL || sz > *nallocp) { | |
c5d10563 | 1955 | *readsetp = xrealloc(*readsetp, nfdset, sizeof(fd_mask)); |
1956 | *writesetp = xrealloc(*writesetp, nfdset, sizeof(fd_mask)); | |
489aa2e9 | 1957 | *nallocp = sz; |
39929cdb | 1958 | } |
489aa2e9 | 1959 | *maxfdp = n; |
39929cdb | 1960 | memset(*readsetp, 0, sz); |
1961 | memset(*writesetp, 0, sz); | |
1962 | ||
c422989b | 1963 | if (!rekeying) |
1964 | channel_handler(channel_pre, *readsetp, *writesetp); | |
7368a6c8 | 1965 | } |
1966 | ||
8e7895b8 | 1967 | /* |
1968 | * After select, perform any appropriate operations for channels which have | |
1969 | * events pending. | |
1970 | */ | |
6ae2364d | 1971 | void |
c8e9c167 | 1972 | channel_after_select(fd_set *readset, fd_set *writeset) |
7368a6c8 | 1973 | { |
1974 | channel_handler(channel_post, readset, writeset); | |
1975 | } | |
1976 | ||
8e7895b8 | 1977 | |
39929cdb | 1978 | /* If there is data to send to the connection, enqueue some of it now. */ |
6ae2364d | 1979 | void |
d5bb9418 | 1980 | channel_output_poll(void) |
8efc0c15 | 1981 | { |
7368a6c8 | 1982 | Channel *c; |
9a995072 | 1983 | u_int i, len; |
5260325f | 1984 | |
1985 | for (i = 0; i < channels_alloc; i++) { | |
719fc62f | 1986 | c = channels[i]; |
1987 | if (c == NULL) | |
1988 | continue; | |
48e671d5 | 1989 | |
8e7895b8 | 1990 | /* |
1991 | * We are only interested in channels that can have buffered | |
1992 | * incoming data. | |
1993 | */ | |
48e671d5 | 1994 | if (compat13) { |
7368a6c8 | 1995 | if (c->type != SSH_CHANNEL_OPEN && |
1996 | c->type != SSH_CHANNEL_INPUT_DRAINING) | |
48e671d5 | 1997 | continue; |
1998 | } else { | |
7368a6c8 | 1999 | if (c->type != SSH_CHANNEL_OPEN) |
48e671d5 | 2000 | continue; |
48e671d5 | 2001 | } |
e78a59f5 | 2002 | if (compat20 && |
2003 | (c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) { | |
ee55dacf | 2004 | /* XXX is this true? */ |
418e724c | 2005 | debug3("channel %d: will not send data after close", c->self); |
7e7327a1 | 2006 | continue; |
2007 | } | |
5260325f | 2008 | |
2009 | /* Get the amount of buffered data for this channel. */ | |
ee55dacf | 2010 | if ((c->istate == CHAN_INPUT_OPEN || |
2011 | c->istate == CHAN_INPUT_WAIT_DRAIN) && | |
2012 | (len = buffer_len(&c->input)) > 0) { | |
d20f3c9e | 2013 | if (c->datagram) { |
2014 | if (len > 0) { | |
2015 | u_char *data; | |
2016 | u_int dlen; | |
2017 | ||
2018 | data = buffer_get_string(&c->input, | |
2019 | &dlen); | |
2020 | packet_start(SSH2_MSG_CHANNEL_DATA); | |
2021 | packet_put_int(c->remote_id); | |
2022 | packet_put_string(data, dlen); | |
2023 | packet_send(); | |
2024 | c->remote_window -= dlen + 4; | |
2025 | xfree(data); | |
2026 | } | |
2027 | continue; | |
2028 | } | |
8e7895b8 | 2029 | /* |
2030 | * Send some data for the other side over the secure | |
2031 | * connection. | |
2032 | */ | |
7e7327a1 | 2033 | if (compat20) { |
2034 | if (len > c->remote_window) | |
2035 | len = c->remote_window; | |
2036 | if (len > c->remote_maxpacket) | |
2037 | len = c->remote_maxpacket; | |
5260325f | 2038 | } else { |
7e7327a1 | 2039 | if (packet_is_interactive()) { |
2040 | if (len > 1024) | |
2041 | len = 512; | |
2042 | } else { | |
2043 | /* Keep the packets at reasonable size. */ | |
2044 | if (len > packet_get_maxsize()/2) | |
2045 | len = packet_get_maxsize()/2; | |
2046 | } | |
5260325f | 2047 | } |
7368a6c8 | 2048 | if (len > 0) { |
7e7327a1 | 2049 | packet_start(compat20 ? |
2050 | SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA); | |
7368a6c8 | 2051 | packet_put_int(c->remote_id); |
2052 | packet_put_string(buffer_ptr(&c->input), len); | |
2053 | packet_send(); | |
2054 | buffer_consume(&c->input, len); | |
2055 | c->remote_window -= len; | |
7368a6c8 | 2056 | } |
2057 | } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) { | |
5260325f | 2058 | if (compat13) |
2059 | fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3"); | |
aa3378df | 2060 | /* |
2061 | * input-buffer is empty and read-socket shutdown: | |
d2296ed7 | 2062 | * tell peer, that we will not send more data: send IEOF. |
2063 | * hack for extended data: delay EOF if EFD still in use. | |
aa3378df | 2064 | */ |
d2296ed7 | 2065 | if (CHANNEL_EFD_INPUT_ACTIVE(c)) |
4e2e5cfd | 2066 | debug2("channel %d: ibuf_empty delayed efd %d/(%d)", |
2067 | c->self, c->efd, buffer_len(&c->extended)); | |
d2296ed7 | 2068 | else |
2069 | chan_ibuf_empty(c); | |
5260325f | 2070 | } |
7e7327a1 | 2071 | /* Send extended data, i.e. stderr */ |
2072 | if (compat20 && | |
d2296ed7 | 2073 | !(c->flags & CHAN_EOF_SENT) && |
7e7327a1 | 2074 | c->remote_window > 0 && |
2075 | (len = buffer_len(&c->extended)) > 0 && | |
2076 | c->extended_usage == CHAN_EXTENDED_READ) { | |
f91d9a89 | 2077 | debug2("channel %d: rwin %u elen %u euse %d", |
ee55dacf | 2078 | c->self, c->remote_window, buffer_len(&c->extended), |
2079 | c->extended_usage); | |
7e7327a1 | 2080 | if (len > c->remote_window) |
2081 | len = c->remote_window; | |
2082 | if (len > c->remote_maxpacket) | |
2083 | len = c->remote_maxpacket; | |
2084 | packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA); | |
2085 | packet_put_int(c->remote_id); | |
2086 | packet_put_int(SSH2_EXTENDED_DATA_STDERR); | |
2087 | packet_put_string(buffer_ptr(&c->extended), len); | |
2088 | packet_send(); | |
2089 | buffer_consume(&c->extended, len); | |
2090 | c->remote_window -= len; | |
ee55dacf | 2091 | debug2("channel %d: sent ext data %d", c->self, len); |
7e7327a1 | 2092 | } |
8efc0c15 | 2093 | } |
8efc0c15 | 2094 | } |
2095 | ||
8e7895b8 | 2096 | |
2097 | /* -- protocol input */ | |
04aa9e67 | 2098 | |
2099 | /* ARGSUSED */ | |
6ae2364d | 2100 | void |
7819b5c3 | 2101 | channel_input_data(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2102 | { |
48e671d5 | 2103 | int id; |
5260325f | 2104 | char *data; |
1e3b8b07 | 2105 | u_int data_len; |
7368a6c8 | 2106 | Channel *c; |
5260325f | 2107 | |
2108 | /* Get the channel number and verify it. */ | |
48e671d5 | 2109 | id = packet_get_int(); |
7368a6c8 | 2110 | c = channel_lookup(id); |
2111 | if (c == NULL) | |
48e671d5 | 2112 | packet_disconnect("Received data for nonexistent channel %d.", id); |
5260325f | 2113 | |
2114 | /* Ignore any data for non-open channels (might happen on close) */ | |
7368a6c8 | 2115 | if (c->type != SSH_CHANNEL_OPEN && |
2116 | c->type != SSH_CHANNEL_X11_OPEN) | |
48e671d5 | 2117 | return; |
2118 | ||
5260325f | 2119 | /* Get the data. */ |
17f02f0a | 2120 | data = packet_get_string_ptr(&data_len); |
7368a6c8 | 2121 | |
7741e239 | 2122 | /* |
2123 | * Ignore data for protocol > 1.3 if output end is no longer open. | |
2124 | * For protocol 2 the sending side is reducing its window as it sends | |
2125 | * data, so we must 'fake' consumption of the data in order to ensure | |
2126 | * that window updates are sent back. Otherwise the connection might | |
2127 | * deadlock. | |
2128 | */ | |
2129 | if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN) { | |
2130 | if (compat20) { | |
2131 | c->local_window -= data_len; | |
2132 | c->local_consumed += data_len; | |
2133 | } | |
7741e239 | 2134 | return; |
2135 | } | |
2136 | ||
6aacefa7 | 2137 | if (compat20) { |
7e7327a1 | 2138 | if (data_len > c->local_maxpacket) { |
bbe88b6d | 2139 | logit("channel %d: rcvd big packet %d, maxpack %d", |
7e7327a1 | 2140 | c->self, data_len, c->local_maxpacket); |
2141 | } | |
2142 | if (data_len > c->local_window) { | |
bbe88b6d | 2143 | logit("channel %d: rcvd too much data %d, win %d", |
7e7327a1 | 2144 | c->self, data_len, c->local_window); |
7e7327a1 | 2145 | return; |
2146 | } | |
2147 | c->local_window -= data_len; | |
7e7327a1 | 2148 | } |
d20f3c9e | 2149 | if (c->datagram) |
2150 | buffer_put_string(&c->output, data, data_len); | |
2151 | else | |
2152 | buffer_append(&c->output, data, data_len); | |
17f02f0a | 2153 | packet_check_eom(); |
8efc0c15 | 2154 | } |
8e7895b8 | 2155 | |
04aa9e67 | 2156 | /* ARGSUSED */ |
6ae2364d | 2157 | void |
7819b5c3 | 2158 | channel_input_extended_data(int type, u_int32_t seq, void *ctxt) |
7e7327a1 | 2159 | { |
2160 | int id; | |
7e7327a1 | 2161 | char *data; |
a594fa74 | 2162 | u_int data_len, tcode; |
7e7327a1 | 2163 | Channel *c; |
2164 | ||
2165 | /* Get the channel number and verify it. */ | |
2166 | id = packet_get_int(); | |
2167 | c = channel_lookup(id); | |
2168 | ||
2169 | if (c == NULL) | |
2170 | packet_disconnect("Received extended_data for bad channel %d.", id); | |
2171 | if (c->type != SSH_CHANNEL_OPEN) { | |
bbe88b6d | 2172 | logit("channel %d: ext data for non open", id); |
7e7327a1 | 2173 | return; |
2174 | } | |
d2296ed7 | 2175 | if (c->flags & CHAN_EOF_RCVD) { |
2176 | if (datafellows & SSH_BUG_EXTEOF) | |
2177 | debug("channel %d: accepting ext data after eof", id); | |
2178 | else | |
2179 | packet_disconnect("Received extended_data after EOF " | |
2180 | "on channel %d.", id); | |
2181 | } | |
7e7327a1 | 2182 | tcode = packet_get_int(); |
2183 | if (c->efd == -1 || | |
2184 | c->extended_usage != CHAN_EXTENDED_WRITE || | |
2185 | tcode != SSH2_EXTENDED_DATA_STDERR) { | |
bbe88b6d | 2186 | logit("channel %d: bad ext data", c->self); |
7e7327a1 | 2187 | return; |
2188 | } | |
2189 | data = packet_get_string(&data_len); | |
95500969 | 2190 | packet_check_eom(); |
7e7327a1 | 2191 | if (data_len > c->local_window) { |
bbe88b6d | 2192 | logit("channel %d: rcvd too much extended_data %d, win %d", |
7e7327a1 | 2193 | c->self, data_len, c->local_window); |
2194 | xfree(data); | |
2195 | return; | |
2196 | } | |
de273eef | 2197 | debug2("channel %d: rcvd ext data %d", c->self, data_len); |
7e7327a1 | 2198 | c->local_window -= data_len; |
2199 | buffer_append(&c->extended, data, data_len); | |
2200 | xfree(data); | |
2201 | } | |
2202 | ||
04aa9e67 | 2203 | /* ARGSUSED */ |
6ae2364d | 2204 | void |
7819b5c3 | 2205 | channel_input_ieof(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 2206 | { |
2207 | int id; | |
2208 | Channel *c; | |
2209 | ||
7368a6c8 | 2210 | id = packet_get_int(); |
95500969 | 2211 | packet_check_eom(); |
7368a6c8 | 2212 | c = channel_lookup(id); |
2213 | if (c == NULL) | |
2214 | packet_disconnect("Received ieof for nonexistent channel %d.", id); | |
2215 | chan_rcvd_ieof(c); | |
a5f82435 | 2216 | |
2217 | /* XXX force input close */ | |
8341f420 | 2218 | if (c->force_drain && c->istate == CHAN_INPUT_OPEN) { |
a5f82435 | 2219 | debug("channel %d: FORCE input drain", c->self); |
2220 | c->istate = CHAN_INPUT_WAIT_DRAIN; | |
32e7d71f | 2221 | if (buffer_len(&c->input) == 0) |
2222 | chan_ibuf_empty(c); | |
a5f82435 | 2223 | } |
2224 | ||
7368a6c8 | 2225 | } |
8efc0c15 | 2226 | |
04aa9e67 | 2227 | /* ARGSUSED */ |
6ae2364d | 2228 | void |
7819b5c3 | 2229 | channel_input_close(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2230 | { |
7368a6c8 | 2231 | int id; |
2232 | Channel *c; | |
5260325f | 2233 | |
7368a6c8 | 2234 | id = packet_get_int(); |
95500969 | 2235 | packet_check_eom(); |
7368a6c8 | 2236 | c = channel_lookup(id); |
2237 | if (c == NULL) | |
2238 | packet_disconnect("Received close for nonexistent channel %d.", id); | |
aa3378df | 2239 | |
2240 | /* | |
2241 | * Send a confirmation that we have closed the channel and no more | |
2242 | * data is coming for it. | |
2243 | */ | |
5260325f | 2244 | packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION); |
7368a6c8 | 2245 | packet_put_int(c->remote_id); |
5260325f | 2246 | packet_send(); |
2247 | ||
aa3378df | 2248 | /* |
2249 | * If the channel is in closed state, we have sent a close request, | |
2250 | * and the other side will eventually respond with a confirmation. | |
2251 | * Thus, we cannot free the channel here, because then there would be | |
2252 | * no-one to receive the confirmation. The channel gets freed when | |
2253 | * the confirmation arrives. | |
2254 | */ | |
7368a6c8 | 2255 | if (c->type != SSH_CHANNEL_CLOSED) { |
aa3378df | 2256 | /* |
2257 | * Not a closed channel - mark it as draining, which will | |
2258 | * cause it to be freed later. | |
2259 | */ | |
9c50edcf | 2260 | buffer_clear(&c->input); |
7368a6c8 | 2261 | c->type = SSH_CHANNEL_OUTPUT_DRAINING; |
5260325f | 2262 | } |
8efc0c15 | 2263 | } |
2264 | ||
7368a6c8 | 2265 | /* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */ |
04aa9e67 | 2266 | /* ARGSUSED */ |
6ae2364d | 2267 | void |
7819b5c3 | 2268 | channel_input_oclose(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2269 | { |
7368a6c8 | 2270 | int id = packet_get_int(); |
2271 | Channel *c = channel_lookup(id); | |
a8a21a53 | 2272 | |
95500969 | 2273 | packet_check_eom(); |
7368a6c8 | 2274 | if (c == NULL) |
2275 | packet_disconnect("Received oclose for nonexistent channel %d.", id); | |
2276 | chan_rcvd_oclose(c); | |
8efc0c15 | 2277 | } |
2278 | ||
04aa9e67 | 2279 | /* ARGSUSED */ |
6ae2364d | 2280 | void |
7819b5c3 | 2281 | channel_input_close_confirmation(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 2282 | { |
2283 | int id = packet_get_int(); | |
2284 | Channel *c = channel_lookup(id); | |
2285 | ||
95500969 | 2286 | packet_check_eom(); |
7368a6c8 | 2287 | if (c == NULL) |
2288 | packet_disconnect("Received close confirmation for " | |
2289 | "out-of-range channel %d.", id); | |
2290 | if (c->type != SSH_CHANNEL_CLOSED) | |
2291 | packet_disconnect("Received close confirmation for " | |
2292 | "non-closed channel %d (type %d).", id, c->type); | |
719fc62f | 2293 | channel_free(c); |
7368a6c8 | 2294 | } |
8efc0c15 | 2295 | |
04aa9e67 | 2296 | /* ARGSUSED */ |
6ae2364d | 2297 | void |
7819b5c3 | 2298 | channel_input_open_confirmation(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2299 | { |
7368a6c8 | 2300 | int id, remote_id; |
2301 | Channel *c; | |
5260325f | 2302 | |
7368a6c8 | 2303 | id = packet_get_int(); |
2304 | c = channel_lookup(id); | |
5260325f | 2305 | |
7368a6c8 | 2306 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) |
2307 | packet_disconnect("Received open confirmation for " | |
2308 | "non-opening channel %d.", id); | |
2309 | remote_id = packet_get_int(); | |
aa3378df | 2310 | /* Record the remote channel number and mark that the channel is now open. */ |
7368a6c8 | 2311 | c->remote_id = remote_id; |
2312 | c->type = SSH_CHANNEL_OPEN; | |
7e7327a1 | 2313 | |
2314 | if (compat20) { | |
2315 | c->remote_window = packet_get_int(); | |
2316 | c->remote_maxpacket = packet_get_int(); | |
3593bdc0 | 2317 | if (c->open_confirm) { |
de273eef | 2318 | debug2("callback start"); |
3593bdc0 | 2319 | c->open_confirm(c->self, c->open_confirm_ctx); |
de273eef | 2320 | debug2("callback done"); |
7e7327a1 | 2321 | } |
d7ac5f18 | 2322 | debug2("channel %d: open confirm rwindow %u rmax %u", c->self, |
7e7327a1 | 2323 | c->remote_window, c->remote_maxpacket); |
2324 | } | |
95500969 | 2325 | packet_check_eom(); |
8efc0c15 | 2326 | } |
2327 | ||
396c147e | 2328 | static char * |
d18e0850 | 2329 | reason2txt(int reason) |
2330 | { | |
6aacefa7 | 2331 | switch (reason) { |
d18e0850 | 2332 | case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED: |
2333 | return "administratively prohibited"; | |
2334 | case SSH2_OPEN_CONNECT_FAILED: | |
2335 | return "connect failed"; | |
2336 | case SSH2_OPEN_UNKNOWN_CHANNEL_TYPE: | |
2337 | return "unknown channel type"; | |
2338 | case SSH2_OPEN_RESOURCE_SHORTAGE: | |
2339 | return "resource shortage"; | |
2340 | } | |
7e8c18e9 | 2341 | return "unknown reason"; |
d18e0850 | 2342 | } |
2343 | ||
04aa9e67 | 2344 | /* ARGSUSED */ |
6ae2364d | 2345 | void |
7819b5c3 | 2346 | channel_input_open_failure(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2347 | { |
02a024dd | 2348 | int id, reason; |
2349 | char *msg = NULL, *lang = NULL; | |
7368a6c8 | 2350 | Channel *c; |
5260325f | 2351 | |
7368a6c8 | 2352 | id = packet_get_int(); |
2353 | c = channel_lookup(id); | |
2354 | ||
2355 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) | |
2356 | packet_disconnect("Received open failure for " | |
2357 | "non-opening channel %d.", id); | |
7e7327a1 | 2358 | if (compat20) { |
02a024dd | 2359 | reason = packet_get_int(); |
fbe90f7b | 2360 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { |
02a024dd | 2361 | msg = packet_get_string(NULL); |
2362 | lang = packet_get_string(NULL); | |
2363 | } | |
bbe88b6d | 2364 | logit("channel %d: open failed: %s%s%s", id, |
d18e0850 | 2365 | reason2txt(reason), msg ? ": ": "", msg ? msg : ""); |
02a024dd | 2366 | if (msg != NULL) |
2367 | xfree(msg); | |
2368 | if (lang != NULL) | |
2369 | xfree(lang); | |
7e7327a1 | 2370 | } |
95500969 | 2371 | packet_check_eom(); |
6cf44b6a | 2372 | /* Schedule the channel for cleanup/deletion. */ |
2373 | chan_mark_dead(c); | |
8efc0c15 | 2374 | } |
2375 | ||
04aa9e67 | 2376 | /* ARGSUSED */ |
8e7895b8 | 2377 | void |
7819b5c3 | 2378 | channel_input_window_adjust(int type, u_int32_t seq, void *ctxt) |
8e7895b8 | 2379 | { |
2380 | Channel *c; | |
f91d9a89 | 2381 | int id; |
2382 | u_int adjust; | |
3ffc6336 | 2383 | |
8e7895b8 | 2384 | if (!compat20) |
2385 | return; | |
8efc0c15 | 2386 | |
8e7895b8 | 2387 | /* Get the channel number and verify it. */ |
2388 | id = packet_get_int(); | |
2389 | c = channel_lookup(id); | |
2390 | ||
b872f7f0 | 2391 | if (c == NULL) { |
2392 | logit("Received window adjust for non-open channel %d.", id); | |
8e7895b8 | 2393 | return; |
2394 | } | |
2395 | adjust = packet_get_int(); | |
95500969 | 2396 | packet_check_eom(); |
f91d9a89 | 2397 | debug2("channel %d: rcvd adjust %u", id, adjust); |
8e7895b8 | 2398 | c->remote_window += adjust; |
2399 | } | |
2400 | ||
04aa9e67 | 2401 | /* ARGSUSED */ |
8e7895b8 | 2402 | void |
7819b5c3 | 2403 | channel_input_port_open(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2404 | { |
8e7895b8 | 2405 | Channel *c = NULL; |
2406 | u_short host_port; | |
2407 | char *host, *originator_string; | |
e07e21ad | 2408 | int remote_id; |
5260325f | 2409 | |
8e7895b8 | 2410 | remote_id = packet_get_int(); |
2411 | host = packet_get_string(NULL); | |
2412 | host_port = packet_get_int(); | |
2413 | ||
2414 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) { | |
2415 | originator_string = packet_get_string(NULL); | |
2416 | } else { | |
2417 | originator_string = xstrdup("unknown (remote did not supply name)"); | |
2418 | } | |
95500969 | 2419 | packet_check_eom(); |
e07e21ad | 2420 | c = channel_connect_to(host, host_port, |
2421 | "connected socket", originator_string); | |
0d942eff | 2422 | xfree(originator_string); |
e07e21ad | 2423 | xfree(host); |
8e7895b8 | 2424 | if (c == NULL) { |
2425 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
2426 | packet_put_int(remote_id); | |
2427 | packet_send(); | |
e07e21ad | 2428 | } else |
2429 | c->remote_id = remote_id; | |
8efc0c15 | 2430 | } |
2431 | ||
3593bdc0 | 2432 | /* ARGSUSED */ |
2433 | void | |
2434 | channel_input_status_confirm(int type, u_int32_t seq, void *ctxt) | |
2435 | { | |
2436 | Channel *c; | |
2437 | struct channel_confirm *cc; | |
b09b559d | 2438 | int id; |
3593bdc0 | 2439 | |
2440 | /* Reset keepalive timeout */ | |
dc1f1948 | 2441 | packet_set_alive_timeouts(0); |
3593bdc0 | 2442 | |
b09b559d | 2443 | id = packet_get_int(); |
3593bdc0 | 2444 | packet_check_eom(); |
2445 | ||
b09b559d | 2446 | debug2("channel_input_status_confirm: type %d id %d", type, id); |
3593bdc0 | 2447 | |
b09b559d | 2448 | if ((c = channel_lookup(id)) == NULL) { |
2449 | logit("channel_input_status_confirm: %d: unknown", id); | |
3593bdc0 | 2450 | return; |
2451 | } | |
2452 | ; | |
2453 | if ((cc = TAILQ_FIRST(&c->status_confirms)) == NULL) | |
2454 | return; | |
2455 | cc->cb(type, c, cc->ctx); | |
2456 | TAILQ_REMOVE(&c->status_confirms, cc, entry); | |
2457 | bzero(cc, sizeof(*cc)); | |
2458 | xfree(cc); | |
2459 | } | |
8e7895b8 | 2460 | |
2461 | /* -- tcp forwarding */ | |
2462 | ||
5e4a7219 | 2463 | void |
2464 | channel_set_af(int af) | |
2465 | { | |
2466 | IPv4or6 = af; | |
2467 | } | |
2468 | ||
fe7dba42 | 2469 | void |
2470 | channel_set_rdomain(int rdomain) | |
2471 | { | |
2472 | channel_rdomain = rdomain; | |
2473 | } | |
2474 | ||
5641aefa | 2475 | static int |
17525a70 | 2476 | channel_setup_fwd_listener(int type, const char *listen_addr, |
2477 | u_short listen_port, int *allocated_listen_port, | |
5641aefa | 2478 | const char *host_to_connect, u_short port_to_connect, int gateway_ports) |
8efc0c15 | 2479 | { |
719fc62f | 2480 | Channel *c; |
442aee3a | 2481 | int sock, r, success = 0, wildcard = 0, is_client; |
48e671d5 | 2482 | struct addrinfo hints, *ai, *aitop; |
3867aa0a | 2483 | const char *host, *addr; |
5641aefa | 2484 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
17525a70 | 2485 | in_port_t *lport_p; |
5260325f | 2486 | |
5641aefa | 2487 | host = (type == SSH_CHANNEL_RPORT_LISTENER) ? |
2488 | listen_addr : host_to_connect; | |
3867aa0a | 2489 | is_client = (type == SSH_CHANNEL_PORT_LISTENER); |
02a024dd | 2490 | |
5641aefa | 2491 | if (host == NULL) { |
2492 | error("No forward host name."); | |
38946c65 | 2493 | return 0; |
fa08c86b | 2494 | } |
920706fd | 2495 | if (strlen(host) >= NI_MAXHOST) { |
02a024dd | 2496 | error("Forward host name too long."); |
38946c65 | 2497 | return 0; |
02a024dd | 2498 | } |
5260325f | 2499 | |
3867aa0a | 2500 | /* |
2501 | * Determine whether or not a port forward listens to loopback, | |
f8cc7664 | 2502 | * specified address or wildcard. On the client, a specified bind |
2503 | * address will always override gateway_ports. On the server, a | |
2504 | * gateway_ports of 1 (``yes'') will override the client's | |
2505 | * specification and force a wildcard bind, whereas a value of 2 | |
2506 | * (``clientspecified'') will bind to whatever address the client | |
3867aa0a | 2507 | * asked for. |
2508 | * | |
2509 | * Special-case listen_addrs are: | |
2510 | * | |
2511 | * "0.0.0.0" -> wildcard v4/v6 if SSH_OLD_FORWARD_ADDR | |
2512 | * "" (empty string), "*" -> wildcard v4/v6 | |
2513 | * "localhost" -> loopback v4/v6 | |
2514 | */ | |
2515 | addr = NULL; | |
2516 | if (listen_addr == NULL) { | |
2517 | /* No address specified: default to gateway_ports setting */ | |
2518 | if (gateway_ports) | |
2519 | wildcard = 1; | |
2520 | } else if (gateway_ports || is_client) { | |
2521 | if (((datafellows & SSH_OLD_FORWARD_ADDR) && | |
bc4cc956 | 2522 | strcmp(listen_addr, "0.0.0.0") == 0 && is_client == 0) || |
3867aa0a | 2523 | *listen_addr == '\0' || strcmp(listen_addr, "*") == 0 || |
2524 | (!is_client && gateway_ports == 1)) | |
2525 | wildcard = 1; | |
2526 | else if (strcmp(listen_addr, "localhost") != 0) | |
2527 | addr = listen_addr; | |
2528 | } | |
2529 | ||
2530 | debug3("channel_setup_fwd_listener: type %d wildcard %d addr %s", | |
2531 | type, wildcard, (addr == NULL) ? "NULL" : addr); | |
2532 | ||
aa3378df | 2533 | /* |
48e671d5 | 2534 | * getaddrinfo returns a loopback address if the hostname is |
2535 | * set to NULL and hints.ai_flags is not AI_PASSIVE | |
aa3378df | 2536 | */ |
48e671d5 | 2537 | memset(&hints, 0, sizeof(hints)); |
2538 | hints.ai_family = IPv4or6; | |
3867aa0a | 2539 | hints.ai_flags = wildcard ? AI_PASSIVE : 0; |
48e671d5 | 2540 | hints.ai_socktype = SOCK_STREAM; |
fa08c86b | 2541 | snprintf(strport, sizeof strport, "%d", listen_port); |
3867aa0a | 2542 | if ((r = getaddrinfo(addr, strport, &hints, &aitop)) != 0) { |
2543 | if (addr == NULL) { | |
2544 | /* This really shouldn't happen */ | |
2545 | packet_disconnect("getaddrinfo: fatal error: %s", | |
bb4626fe | 2546 | ssh_gai_strerror(r)); |
3867aa0a | 2547 | } else { |
38946c65 | 2548 | error("channel_setup_fwd_listener: " |
bb4626fe | 2549 | "getaddrinfo(%.64s): %s", addr, |
2550 | ssh_gai_strerror(r)); | |
3867aa0a | 2551 | } |
38946c65 | 2552 | return 0; |
3867aa0a | 2553 | } |
17525a70 | 2554 | if (allocated_listen_port != NULL) |
2555 | *allocated_listen_port = 0; | |
48e671d5 | 2556 | for (ai = aitop; ai; ai = ai->ai_next) { |
17525a70 | 2557 | switch (ai->ai_family) { |
2558 | case AF_INET: | |
2559 | lport_p = &((struct sockaddr_in *)ai->ai_addr)-> | |
2560 | sin_port; | |
2561 | break; | |
2562 | case AF_INET6: | |
2563 | lport_p = &((struct sockaddr_in6 *)ai->ai_addr)-> | |
2564 | sin6_port; | |
2565 | break; | |
2566 | default: | |
48e671d5 | 2567 | continue; |
17525a70 | 2568 | } |
2569 | /* | |
2570 | * If allocating a port for -R forwards, then use the | |
2571 | * same port for all address families. | |
2572 | */ | |
2573 | if (type == SSH_CHANNEL_RPORT_LISTENER && listen_port == 0 && | |
2574 | allocated_listen_port != NULL && *allocated_listen_port > 0) | |
2575 | *lport_p = htons(*allocated_listen_port); | |
2576 | ||
48e671d5 | 2577 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), |
2578 | strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { | |
5641aefa | 2579 | error("channel_setup_fwd_listener: getnameinfo failed"); |
48e671d5 | 2580 | continue; |
2581 | } | |
2582 | /* Create a port to listen for the host. */ | |
fe7dba42 | 2583 | sock = socket_rdomain(ai->ai_family, ai->ai_socktype, |
2584 | ai->ai_protocol, channel_rdomain); | |
48e671d5 | 2585 | if (sock < 0) { |
2586 | /* this is no error since kernel may not support ipv6 */ | |
2587 | verbose("socket: %.100s", strerror(errno)); | |
2588 | continue; | |
2589 | } | |
442aee3a | 2590 | |
2591 | channel_set_reuseaddr(sock); | |
4e1082aa | 2592 | if (ai->ai_family == AF_INET6) |
2593 | sock_set_v6only(sock); | |
facfd613 | 2594 | |
17525a70 | 2595 | debug("Local forwarding listening on %s port %s.", |
2596 | ntop, strport); | |
48e671d5 | 2597 | |
2598 | /* Bind the socket to the address. */ | |
2599 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { | |
2600 | /* address can be in use ipv6 address is already bound */ | |
16218745 | 2601 | if (!ai->ai_next) |
2602 | error("bind: %.100s", strerror(errno)); | |
2603 | else | |
2604 | verbose("bind: %.100s", strerror(errno)); | |
2b87da3b | 2605 | |
48e671d5 | 2606 | close(sock); |
2607 | continue; | |
2608 | } | |
2609 | /* Start listening for connections on the socket. */ | |
fce39749 | 2610 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { |
48e671d5 | 2611 | error("listen: %.100s", strerror(errno)); |
2612 | close(sock); | |
2613 | continue; | |
2614 | } | |
17525a70 | 2615 | |
2616 | /* | |
2617 | * listen_port == 0 requests a dynamically allocated port - | |
2618 | * record what we got. | |
2619 | */ | |
2620 | if (type == SSH_CHANNEL_RPORT_LISTENER && listen_port == 0 && | |
2621 | allocated_listen_port != NULL && | |
2622 | *allocated_listen_port == 0) { | |
2623 | *allocated_listen_port = get_sock_port(sock, 1); | |
2624 | debug("Allocated listen port %d", | |
2625 | *allocated_listen_port); | |
2626 | } | |
2627 | ||
48e671d5 | 2628 | /* Allocate a channel number for the socket. */ |
8e7895b8 | 2629 | c = channel_new("port listener", type, sock, sock, -1, |
0b242b12 | 2630 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, |
0d942eff | 2631 | 0, "port listener", 1); |
1338ba77 | 2632 | c->path = xstrdup(host); |
719fc62f | 2633 | c->host_port = port_to_connect; |
2634 | c->listening_port = listen_port; | |
48e671d5 | 2635 | success = 1; |
2636 | } | |
2637 | if (success == 0) | |
5641aefa | 2638 | error("channel_setup_fwd_listener: cannot listen to port: %d", |
02a024dd | 2639 | listen_port); |
48e671d5 | 2640 | freeaddrinfo(aitop); |
02a024dd | 2641 | return success; |
5260325f | 2642 | } |
8efc0c15 | 2643 | |
d740ec16 | 2644 | int |
2645 | channel_cancel_rport_listener(const char *host, u_short port) | |
2646 | { | |
9a995072 | 2647 | u_int i; |
2648 | int found = 0; | |
d740ec16 | 2649 | |
f8cc7664 | 2650 | for (i = 0; i < channels_alloc; i++) { |
d740ec16 | 2651 | Channel *c = channels[i]; |
2652 | ||
2653 | if (c != NULL && c->type == SSH_CHANNEL_RPORT_LISTENER && | |
1338ba77 | 2654 | strcmp(c->path, host) == 0 && c->listening_port == port) { |
2912cbd6 | 2655 | debug2("%s: close channel %d", __func__, i); |
d740ec16 | 2656 | channel_free(c); |
2657 | found = 1; | |
2658 | } | |
2659 | } | |
2660 | ||
2661 | return (found); | |
2662 | } | |
2663 | ||
5641aefa | 2664 | /* protocol local port fwd, used by ssh (and sshd in v1) */ |
2665 | int | |
3867aa0a | 2666 | channel_setup_local_fwd_listener(const char *listen_host, u_short listen_port, |
5641aefa | 2667 | const char *host_to_connect, u_short port_to_connect, int gateway_ports) |
2668 | { | |
2669 | return channel_setup_fwd_listener(SSH_CHANNEL_PORT_LISTENER, | |
17525a70 | 2670 | listen_host, listen_port, NULL, host_to_connect, port_to_connect, |
3867aa0a | 2671 | gateway_ports); |
5641aefa | 2672 | } |
2673 | ||
2674 | /* protocol v2 remote port fwd, used by sshd */ | |
2675 | int | |
2676 | channel_setup_remote_fwd_listener(const char *listen_address, | |
17525a70 | 2677 | u_short listen_port, int *allocated_listen_port, int gateway_ports) |
5641aefa | 2678 | { |
2679 | return channel_setup_fwd_listener(SSH_CHANNEL_RPORT_LISTENER, | |
17525a70 | 2680 | listen_address, listen_port, allocated_listen_port, |
2681 | NULL, 0, gateway_ports); | |
5641aefa | 2682 | } |
2683 | ||
aa3378df | 2684 | /* |
2685 | * Initiate forwarding of connections to port "port" on remote host through | |
2686 | * the secure channel to host:port from local side. | |
2687 | */ | |
8efc0c15 | 2688 | |
42ea6f5e | 2689 | int |
3867aa0a | 2690 | channel_request_remote_forwarding(const char *listen_host, u_short listen_port, |
fa08c86b | 2691 | const char *host_to_connect, u_short port_to_connect) |
8efc0c15 | 2692 | { |
54a5250f | 2693 | int type, success = 0; |
fa08c86b | 2694 | |
5260325f | 2695 | /* Record locally that connection to this host/port is permitted. */ |
2696 | if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
2697 | fatal("channel_request_remote_forwarding: too many forwards"); | |
2698 | ||
5260325f | 2699 | /* Send the forward request to the remote side. */ |
7e7327a1 | 2700 | if (compat20) { |
3867aa0a | 2701 | const char *address_to_bind; |
04efe9b0 | 2702 | if (listen_host == NULL) { |
2703 | if (datafellows & SSH_BUG_RFWD_ADDR) | |
2704 | address_to_bind = "127.0.0.1"; | |
2705 | else | |
2706 | address_to_bind = "localhost"; | |
2707 | } else if (*listen_host == '\0' || | |
2708 | strcmp(listen_host, "*") == 0) { | |
2709 | if (datafellows & SSH_BUG_RFWD_ADDR) | |
2710 | address_to_bind = "0.0.0.0"; | |
2711 | else | |
2712 | address_to_bind = ""; | |
2713 | } else | |
3867aa0a | 2714 | address_to_bind = listen_host; |
2715 | ||
7e7327a1 | 2716 | packet_start(SSH2_MSG_GLOBAL_REQUEST); |
2717 | packet_put_cstring("tcpip-forward"); | |
e0ae8728 | 2718 | packet_put_char(1); /* boolean: want reply */ |
7e7327a1 | 2719 | packet_put_cstring(address_to_bind); |
2720 | packet_put_int(listen_port); | |
fa08c86b | 2721 | packet_send(); |
2722 | packet_write_wait(); | |
2723 | /* Assume that server accepts the request */ | |
2724 | success = 1; | |
7e7327a1 | 2725 | } else { |
2726 | packet_start(SSH_CMSG_PORT_FORWARD_REQUEST); | |
7e7327a1 | 2727 | packet_put_int(listen_port); |
d6f24e45 | 2728 | packet_put_cstring(host_to_connect); |
2729 | packet_put_int(port_to_connect); | |
7e7327a1 | 2730 | packet_send(); |
2731 | packet_write_wait(); | |
fa08c86b | 2732 | |
2733 | /* Wait for response from the remote side. */ | |
54a5250f | 2734 | type = packet_read(); |
fa08c86b | 2735 | switch (type) { |
2736 | case SSH_SMSG_SUCCESS: | |
2737 | success = 1; | |
2738 | break; | |
2739 | case SSH_SMSG_FAILURE: | |
fa08c86b | 2740 | break; |
2741 | default: | |
2742 | /* Unknown packet */ | |
2743 | packet_disconnect("Protocol error for port forward request:" | |
2744 | "received packet type %d.", type); | |
2745 | } | |
2746 | } | |
2747 | if (success) { | |
2748 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host_to_connect); | |
2749 | permitted_opens[num_permitted_opens].port_to_connect = port_to_connect; | |
2750 | permitted_opens[num_permitted_opens].listen_port = listen_port; | |
2751 | num_permitted_opens++; | |
7e7327a1 | 2752 | } |
42ea6f5e | 2753 | return (success ? 0 : -1); |
8efc0c15 | 2754 | } |
2755 | ||
d740ec16 | 2756 | /* |
f2107e97 | 2757 | * Request cancellation of remote forwarding of connection host:port from |
d740ec16 | 2758 | * local side. |
2759 | */ | |
d740ec16 | 2760 | void |
3867aa0a | 2761 | channel_request_rforward_cancel(const char *host, u_short port) |
d740ec16 | 2762 | { |
2763 | int i; | |
d740ec16 | 2764 | |
2765 | if (!compat20) | |
2766 | return; | |
2767 | ||
2768 | for (i = 0; i < num_permitted_opens; i++) { | |
f2107e97 | 2769 | if (permitted_opens[i].host_to_connect != NULL && |
d740ec16 | 2770 | permitted_opens[i].listen_port == port) |
2771 | break; | |
2772 | } | |
2773 | if (i >= num_permitted_opens) { | |
2774 | debug("%s: requested forward not found", __func__); | |
2775 | return; | |
2776 | } | |
2777 | packet_start(SSH2_MSG_GLOBAL_REQUEST); | |
2778 | packet_put_cstring("cancel-tcpip-forward"); | |
2779 | packet_put_char(0); | |
3867aa0a | 2780 | packet_put_cstring(host == NULL ? "" : host); |
d740ec16 | 2781 | packet_put_int(port); |
2782 | packet_send(); | |
2783 | ||
2784 | permitted_opens[i].listen_port = 0; | |
2785 | permitted_opens[i].port_to_connect = 0; | |
8c4bd764 | 2786 | xfree(permitted_opens[i].host_to_connect); |
d740ec16 | 2787 | permitted_opens[i].host_to_connect = NULL; |
2788 | } | |
2789 | ||
aa3378df | 2790 | /* |
2791 | * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates | |
2792 | * listening for the port, and sends back a success reply (or disconnect | |
42ea6f5e | 2793 | * message if there was an error). |
aa3378df | 2794 | */ |
42ea6f5e | 2795 | int |
1d1ffb87 | 2796 | channel_input_port_forward_request(int is_root, int gateway_ports) |
8efc0c15 | 2797 | { |
57112b5a | 2798 | u_short port, host_port; |
42ea6f5e | 2799 | int success = 0; |
5260325f | 2800 | char *hostname; |
2801 | ||
2802 | /* Get arguments from the packet. */ | |
2803 | port = packet_get_int(); | |
2804 | hostname = packet_get_string(NULL); | |
2805 | host_port = packet_get_int(); | |
2806 | ||
3c62e7eb | 2807 | #ifndef HAVE_CYGWIN |
aa3378df | 2808 | /* |
2809 | * Check that an unprivileged user is not trying to forward a | |
2810 | * privileged port. | |
2811 | */ | |
5260325f | 2812 | if (port < IPPORT_RESERVED && !is_root) |
8e7c9afc | 2813 | packet_disconnect( |
2814 | "Requested forwarding of port %d but user is not root.", | |
2815 | port); | |
2816 | if (host_port == 0) | |
2817 | packet_disconnect("Dynamic forwarding denied."); | |
3c62e7eb | 2818 | #endif |
8e7c9afc | 2819 | |
fa08c86b | 2820 | /* Initiate forwarding */ |
42ea6f5e | 2821 | success = channel_setup_local_fwd_listener(NULL, port, hostname, |
3867aa0a | 2822 | host_port, gateway_ports); |
5260325f | 2823 | |
2824 | /* Free the argument string. */ | |
2825 | xfree(hostname); | |
42ea6f5e | 2826 | |
2827 | return (success ? 0 : -1); | |
8efc0c15 | 2828 | } |
2829 | ||
01794848 | 2830 | /* |
2831 | * Permits opening to any host/port if permitted_opens[] is empty. This is | |
2832 | * usually called by the server, because the user could connect to any port | |
2833 | * anyway, and the server has no way to know but to trust the client anyway. | |
2834 | */ | |
2835 | void | |
d5bb9418 | 2836 | channel_permit_all_opens(void) |
01794848 | 2837 | { |
2838 | if (num_permitted_opens == 0) | |
2839 | all_opens_permitted = 1; | |
2840 | } | |
2841 | ||
cd332296 | 2842 | void |
01794848 | 2843 | channel_add_permitted_opens(char *host, int port) |
2844 | { | |
2845 | if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
42ea6f5e | 2846 | fatal("channel_add_permitted_opens: too many forwards"); |
01794848 | 2847 | debug("allow port forwarding to host %s port %d", host, port); |
2848 | ||
2849 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host); | |
2850 | permitted_opens[num_permitted_opens].port_to_connect = port; | |
2851 | num_permitted_opens++; | |
2852 | ||
2853 | all_opens_permitted = 0; | |
2854 | } | |
2855 | ||
ea46e550 | 2856 | int |
2fefbadf | 2857 | channel_add_adm_permitted_opens(char *host, int port) |
2858 | { | |
2859 | if (num_adm_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
2860 | fatal("channel_add_adm_permitted_opens: too many forwards"); | |
ea46e550 | 2861 | debug("config allows port forwarding to host %s port %d", host, port); |
2fefbadf | 2862 | |
2863 | permitted_adm_opens[num_adm_permitted_opens].host_to_connect | |
2864 | = xstrdup(host); | |
2865 | permitted_adm_opens[num_adm_permitted_opens].port_to_connect = port; | |
ea46e550 | 2866 | return ++num_adm_permitted_opens; |
2fefbadf | 2867 | } |
2868 | ||
cd332296 | 2869 | void |
01794848 | 2870 | channel_clear_permitted_opens(void) |
2871 | { | |
2872 | int i; | |
2873 | ||
2874 | for (i = 0; i < num_permitted_opens; i++) | |
d740ec16 | 2875 | if (permitted_opens[i].host_to_connect != NULL) |
2876 | xfree(permitted_opens[i].host_to_connect); | |
01794848 | 2877 | num_permitted_opens = 0; |
2fefbadf | 2878 | } |
2879 | ||
2880 | void | |
2881 | channel_clear_adm_permitted_opens(void) | |
2882 | { | |
2883 | int i; | |
01794848 | 2884 | |
2fefbadf | 2885 | for (i = 0; i < num_adm_permitted_opens; i++) |
2886 | if (permitted_adm_opens[i].host_to_connect != NULL) | |
2887 | xfree(permitted_adm_opens[i].host_to_connect); | |
2888 | num_adm_permitted_opens = 0; | |
01794848 | 2889 | } |
2890 | ||
1760c982 | 2891 | void |
2892 | channel_print_adm_permitted_opens(void) | |
2893 | { | |
cdfbc829 | 2894 | int i; |
1760c982 | 2895 | |
68405671 | 2896 | printf("permitopen"); |
861e9e53 | 2897 | if (num_adm_permitted_opens == 0) { |
68405671 | 2898 | printf(" any\n"); |
861e9e53 | 2899 | return; |
2900 | } | |
1760c982 | 2901 | for (i = 0; i < num_adm_permitted_opens; i++) |
2902 | if (permitted_adm_opens[i].host_to_connect != NULL) | |
2903 | printf(" %s:%d", permitted_adm_opens[i].host_to_connect, | |
2904 | permitted_adm_opens[i].port_to_connect); | |
68405671 | 2905 | printf("\n"); |
1760c982 | 2906 | } |
2907 | ||
e07e21ad | 2908 | /* Try to start non-blocking connect to next host in cctx list */ |
396c147e | 2909 | static int |
e07e21ad | 2910 | connect_next(struct channel_connect *cctx) |
8efc0c15 | 2911 | { |
e07e21ad | 2912 | int sock, saved_errno; |
48e671d5 | 2913 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
48e671d5 | 2914 | |
e07e21ad | 2915 | for (; cctx->ai; cctx->ai = cctx->ai->ai_next) { |
2916 | if (cctx->ai->ai_family != AF_INET && | |
2917 | cctx->ai->ai_family != AF_INET6) | |
48e671d5 | 2918 | continue; |
e07e21ad | 2919 | if (getnameinfo(cctx->ai->ai_addr, cctx->ai->ai_addrlen, |
2920 | ntop, sizeof(ntop), strport, sizeof(strport), | |
2921 | NI_NUMERICHOST|NI_NUMERICSERV) != 0) { | |
2922 | error("connect_next: getnameinfo failed"); | |
48e671d5 | 2923 | continue; |
5260325f | 2924 | } |
fe7dba42 | 2925 | if ((sock = socket_rdomain(cctx->ai->ai_family, |
2926 | cctx->ai->ai_socktype, cctx->ai->ai_protocol, | |
2927 | channel_rdomain)) == -1) { | |
e07e21ad | 2928 | if (cctx->ai->ai_next == NULL) |
4940c411 | 2929 | error("socket: %.100s", strerror(errno)); |
2930 | else | |
2931 | verbose("socket: %.100s", strerror(errno)); | |
48e671d5 | 2932 | continue; |
5260325f | 2933 | } |
170694d7 | 2934 | if (set_nonblock(sock) == -1) |
2935 | fatal("%s: set_nonblock(%d)", __func__, sock); | |
e07e21ad | 2936 | if (connect(sock, cctx->ai->ai_addr, |
2937 | cctx->ai->ai_addrlen) == -1 && errno != EINPROGRESS) { | |
2938 | debug("connect_next: host %.100s ([%.100s]:%s): " | |
2939 | "%.100s", cctx->host, ntop, strport, | |
48e671d5 | 2940 | strerror(errno)); |
e07e21ad | 2941 | saved_errno = errno; |
48e671d5 | 2942 | close(sock); |
e07e21ad | 2943 | errno = saved_errno; |
2b87da3b | 2944 | continue; /* fail -- try next */ |
48e671d5 | 2945 | } |
e07e21ad | 2946 | debug("connect_next: host %.100s ([%.100s]:%s) " |
2947 | "in progress, fd=%d", cctx->host, ntop, strport, sock); | |
2948 | cctx->ai = cctx->ai->ai_next; | |
2949 | set_nodelay(sock); | |
2950 | return sock; | |
2951 | } | |
2952 | return -1; | |
2953 | } | |
2954 | ||
2955 | static void | |
2956 | channel_connect_ctx_free(struct channel_connect *cctx) | |
2957 | { | |
2958 | xfree(cctx->host); | |
2959 | if (cctx->aitop) | |
2960 | freeaddrinfo(cctx->aitop); | |
2961 | bzero(cctx, sizeof(*cctx)); | |
2962 | cctx->host = NULL; | |
2963 | cctx->ai = cctx->aitop = NULL; | |
2964 | } | |
2965 | ||
2966 | /* Return CONNECTING channel to remote host, port */ | |
2967 | static Channel * | |
2968 | connect_to(const char *host, u_short port, char *ctype, char *rname) | |
2969 | { | |
2970 | struct addrinfo hints; | |
2971 | int gaierr; | |
2972 | int sock = -1; | |
2973 | char strport[NI_MAXSERV]; | |
2974 | struct channel_connect cctx; | |
2975 | Channel *c; | |
5260325f | 2976 | |
267d5589 | 2977 | memset(&cctx, 0, sizeof(cctx)); |
e07e21ad | 2978 | memset(&hints, 0, sizeof(hints)); |
2979 | hints.ai_family = IPv4or6; | |
2980 | hints.ai_socktype = SOCK_STREAM; | |
2981 | snprintf(strport, sizeof strport, "%d", port); | |
2982 | if ((gaierr = getaddrinfo(host, strport, &hints, &cctx.aitop)) != 0) { | |
2983 | error("connect_to %.100s: unknown host (%s)", host, | |
2984 | ssh_gai_strerror(gaierr)); | |
2985 | return NULL; | |
5260325f | 2986 | } |
e07e21ad | 2987 | |
2988 | cctx.host = xstrdup(host); | |
2989 | cctx.port = port; | |
2990 | cctx.ai = cctx.aitop; | |
2991 | ||
2992 | if ((sock = connect_next(&cctx)) == -1) { | |
2993 | error("connect to %.100s port %d failed: %s", | |
2994 | host, port, strerror(errno)); | |
2995 | channel_connect_ctx_free(&cctx); | |
2996 | return NULL; | |
8efc0c15 | 2997 | } |
e07e21ad | 2998 | c = channel_new(ctype, SSH_CHANNEL_CONNECTING, sock, sock, -1, |
2999 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, rname, 1); | |
3000 | c->connect_ctx = cctx; | |
3001 | return c; | |
7368a6c8 | 3002 | } |
01794848 | 3003 | |
e07e21ad | 3004 | Channel * |
3005 | channel_connect_by_listen_address(u_short listen_port, char *ctype, char *rname) | |
fa08c86b | 3006 | { |
3007 | int i; | |
01794848 | 3008 | |
e07e21ad | 3009 | for (i = 0; i < num_permitted_opens; i++) { |
d740ec16 | 3010 | if (permitted_opens[i].host_to_connect != NULL && |
e07e21ad | 3011 | permitted_opens[i].listen_port == listen_port) { |
01794848 | 3012 | return connect_to( |
fa08c86b | 3013 | permitted_opens[i].host_to_connect, |
e07e21ad | 3014 | permitted_opens[i].port_to_connect, ctype, rname); |
3015 | } | |
3016 | } | |
0b6fbf03 | 3017 | error("WARNING: Server requests forwarding for unknown listen_port %d", |
3018 | listen_port); | |
e07e21ad | 3019 | return NULL; |
fa08c86b | 3020 | } |
48e671d5 | 3021 | |
01794848 | 3022 | /* Check if connecting to that port is permitted and connect. */ |
e07e21ad | 3023 | Channel * |
3024 | channel_connect_to(const char *host, u_short port, char *ctype, char *rname) | |
01794848 | 3025 | { |
2fefbadf | 3026 | int i, permit, permit_adm = 1; |
01794848 | 3027 | |
3028 | permit = all_opens_permitted; | |
3029 | if (!permit) { | |
3030 | for (i = 0; i < num_permitted_opens; i++) | |
d740ec16 | 3031 | if (permitted_opens[i].host_to_connect != NULL && |
3032 | permitted_opens[i].port_to_connect == port && | |
01794848 | 3033 | strcmp(permitted_opens[i].host_to_connect, host) == 0) |
3034 | permit = 1; | |
2fefbadf | 3035 | } |
01794848 | 3036 | |
2fefbadf | 3037 | if (num_adm_permitted_opens > 0) { |
3038 | permit_adm = 0; | |
3039 | for (i = 0; i < num_adm_permitted_opens; i++) | |
3040 | if (permitted_adm_opens[i].host_to_connect != NULL && | |
3041 | permitted_adm_opens[i].port_to_connect == port && | |
3042 | strcmp(permitted_adm_opens[i].host_to_connect, host) | |
3043 | == 0) | |
3044 | permit_adm = 1; | |
01794848 | 3045 | } |
2fefbadf | 3046 | |
3047 | if (!permit || !permit_adm) { | |
bbe88b6d | 3048 | logit("Received request to connect to host %.100s port %d, " |
01794848 | 3049 | "but the request was denied.", host, port); |
e07e21ad | 3050 | return NULL; |
01794848 | 3051 | } |
e07e21ad | 3052 | return connect_to(host, port, ctype, rname); |
01794848 | 3053 | } |
3054 | ||
5e96b616 | 3055 | void |
3056 | channel_send_window_changes(void) | |
3057 | { | |
9a995072 | 3058 | u_int i; |
5e96b616 | 3059 | struct winsize ws; |
3060 | ||
3061 | for (i = 0; i < channels_alloc; i++) { | |
f8cc7664 | 3062 | if (channels[i] == NULL || !channels[i]->client_tty || |
5e96b616 | 3063 | channels[i]->type != SSH_CHANNEL_OPEN) |
3064 | continue; | |
3065 | if (ioctl(channels[i]->rfd, TIOCGWINSZ, &ws) < 0) | |
3066 | continue; | |
3067 | channel_request_start(i, "window-change", 0); | |
148de80c | 3068 | packet_put_int((u_int)ws.ws_col); |
3069 | packet_put_int((u_int)ws.ws_row); | |
3070 | packet_put_int((u_int)ws.ws_xpixel); | |
3071 | packet_put_int((u_int)ws.ws_ypixel); | |
5e96b616 | 3072 | packet_send(); |
3073 | } | |
3074 | } | |
3075 | ||
8e7895b8 | 3076 | /* -- X11 forwarding */ |
8efc0c15 | 3077 | |
aa3378df | 3078 | /* |
3079 | * Creates an internet domain socket for listening for X11 connections. | |
57f228e8 | 3080 | * Returns 0 and a suitable display number for the DISPLAY variable |
3081 | * stored in display_numberp , or -1 if an error occurs. | |
aa3378df | 3082 | */ |
c9d0ad9b | 3083 | int |
e6e573bd | 3084 | x11_create_display_inet(int x11_display_offset, int x11_use_localhost, |
d08341e6 | 3085 | int single_connection, u_int *display_numberp, int **chanids) |
8efc0c15 | 3086 | { |
ac151b18 | 3087 | Channel *nc = NULL; |
57112b5a | 3088 | int display_number, sock; |
3089 | u_short port; | |
48e671d5 | 3090 | struct addrinfo hints, *ai, *aitop; |
3091 | char strport[NI_MAXSERV]; | |
3092 | int gaierr, n, num_socks = 0, socks[NUM_SOCKS]; | |
5260325f | 3093 | |
59e5aff5 | 3094 | if (chanids == NULL) |
3095 | return -1; | |
3096 | ||
95f1eccc | 3097 | for (display_number = x11_display_offset; |
184eed6a | 3098 | display_number < MAX_DISPLAYS; |
3099 | display_number++) { | |
5260325f | 3100 | port = 6000 + display_number; |
48e671d5 | 3101 | memset(&hints, 0, sizeof(hints)); |
3102 | hints.ai_family = IPv4or6; | |
e6e573bd | 3103 | hints.ai_flags = x11_use_localhost ? 0: AI_PASSIVE; |
48e671d5 | 3104 | hints.ai_socktype = SOCK_STREAM; |
3105 | snprintf(strport, sizeof strport, "%d", port); | |
3106 | if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) { | |
bb4626fe | 3107 | error("getaddrinfo: %.100s", ssh_gai_strerror(gaierr)); |
c9d0ad9b | 3108 | return -1; |
5260325f | 3109 | } |
48e671d5 | 3110 | for (ai = aitop; ai; ai = ai->ai_next) { |
3111 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
3112 | continue; | |
fe7dba42 | 3113 | sock = socket_rdomain(ai->ai_family, ai->ai_socktype, |
3114 | ai->ai_protocol, channel_rdomain); | |
48e671d5 | 3115 | if (sock < 0) { |
4ee81249 | 3116 | if ((errno != EINVAL) && (errno != EAFNOSUPPORT)) { |
80a44451 | 3117 | error("socket: %.100s", strerror(errno)); |
0ea89f7e | 3118 | freeaddrinfo(aitop); |
c9d0ad9b | 3119 | return -1; |
80a44451 | 3120 | } else { |
22d89d24 | 3121 | debug("x11_create_display_inet: Socket family %d not supported", |
3122 | ai->ai_family); | |
80a44451 | 3123 | continue; |
3124 | } | |
48e671d5 | 3125 | } |
4e1082aa | 3126 | if (ai->ai_family == AF_INET6) |
3127 | sock_set_v6only(sock); | |
554ebbed | 3128 | if (x11_use_localhost) |
3129 | channel_set_reuseaddr(sock); | |
48e671d5 | 3130 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { |
d7ac5f18 | 3131 | debug2("bind port %d: %.100s", port, strerror(errno)); |
48e671d5 | 3132 | close(sock); |
16218745 | 3133 | |
48e671d5 | 3134 | for (n = 0; n < num_socks; n++) { |
48e671d5 | 3135 | close(socks[n]); |
3136 | } | |
3137 | num_socks = 0; | |
3138 | break; | |
3139 | } | |
3140 | socks[num_socks++] = sock; | |
3141 | if (num_socks == NUM_SOCKS) | |
3142 | break; | |
5260325f | 3143 | } |
4ccb01d6 | 3144 | freeaddrinfo(aitop); |
48e671d5 | 3145 | if (num_socks > 0) |
3146 | break; | |
5260325f | 3147 | } |
3148 | if (display_number >= MAX_DISPLAYS) { | |
3149 | error("Failed to allocate internet-domain X11 display socket."); | |
c9d0ad9b | 3150 | return -1; |
8efc0c15 | 3151 | } |
5260325f | 3152 | /* Start listening for connections on the socket. */ |
48e671d5 | 3153 | for (n = 0; n < num_socks; n++) { |
3154 | sock = socks[n]; | |
fce39749 | 3155 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { |
48e671d5 | 3156 | error("listen: %.100s", strerror(errno)); |
48e671d5 | 3157 | close(sock); |
c9d0ad9b | 3158 | return -1; |
a7effaac | 3159 | } |
a7effaac | 3160 | } |
5260325f | 3161 | |
48e671d5 | 3162 | /* Allocate a channel for each socket. */ |
52e3daed | 3163 | *chanids = xcalloc(num_socks + 1, sizeof(**chanids)); |
48e671d5 | 3164 | for (n = 0; n < num_socks; n++) { |
3165 | sock = socks[n]; | |
ac151b18 | 3166 | nc = channel_new("x11 listener", |
0b242b12 | 3167 | SSH_CHANNEL_X11_LISTENER, sock, sock, -1, |
3168 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, | |
0d942eff | 3169 | 0, "X11 inet listener", 1); |
3a0d3d54 | 3170 | nc->single_connection = single_connection; |
59e5aff5 | 3171 | (*chanids)[n] = nc->self; |
48e671d5 | 3172 | } |
59e5aff5 | 3173 | (*chanids)[n] = -1; |
5260325f | 3174 | |
c9d0ad9b | 3175 | /* Return the display number for the DISPLAY environment variable. */ |
57f228e8 | 3176 | *display_numberp = display_number; |
3177 | return (0); | |
8efc0c15 | 3178 | } |
3179 | ||
396c147e | 3180 | static int |
b5a1596f | 3181 | connect_local_xsocket_path(const char *pathname) |
8efc0c15 | 3182 | { |
5260325f | 3183 | int sock; |
3184 | struct sockaddr_un addr; | |
5260325f | 3185 | |
805e659f | 3186 | sock = socket(AF_UNIX, SOCK_STREAM, 0); |
3187 | if (sock < 0) | |
3188 | error("socket: %.100s", strerror(errno)); | |
3189 | memset(&addr, 0, sizeof(addr)); | |
3190 | addr.sun_family = AF_UNIX; | |
b5a1596f | 3191 | strlcpy(addr.sun_path, pathname, sizeof addr.sun_path); |
32596c7b | 3192 | if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) == 0) |
805e659f | 3193 | return sock; |
3194 | close(sock); | |
5260325f | 3195 | error("connect %.100s: %.100s", addr.sun_path, strerror(errno)); |
3196 | return -1; | |
8efc0c15 | 3197 | } |
3198 | ||
b5a1596f | 3199 | static int |
3200 | connect_local_xsocket(u_int dnr) | |
3201 | { | |
3202 | char buf[1024]; | |
3203 | snprintf(buf, sizeof buf, _PATH_UNIX_X, dnr); | |
3204 | return connect_local_xsocket_path(buf); | |
3205 | } | |
3206 | ||
0b242b12 | 3207 | int |
3208 | x11_connect_display(void) | |
8efc0c15 | 3209 | { |
4f16046f | 3210 | u_int display_number; |
5260325f | 3211 | const char *display; |
0b242b12 | 3212 | char buf[1024], *cp; |
48e671d5 | 3213 | struct addrinfo hints, *ai, *aitop; |
3214 | char strport[NI_MAXSERV]; | |
4f16046f | 3215 | int gaierr, sock = 0; |
5260325f | 3216 | |
5260325f | 3217 | /* Try to open a socket for the local X server. */ |
3218 | display = getenv("DISPLAY"); | |
3219 | if (!display) { | |
3220 | error("DISPLAY not set."); | |
0b242b12 | 3221 | return -1; |
5260325f | 3222 | } |
aa3378df | 3223 | /* |
3224 | * Now we decode the value of the DISPLAY variable and make a | |
3225 | * connection to the real X server. | |
3226 | */ | |
3227 | ||
b5a1596f | 3228 | /* Check if the display is from launchd. */ |
3229 | #ifdef __APPLE__ | |
3230 | if (strncmp(display, "/tmp/launch", 11) == 0) { | |
3231 | sock = connect_local_xsocket_path(display); | |
3232 | if (sock < 0) | |
3233 | return -1; | |
3234 | ||
3235 | /* OK, we now have a connection to the display. */ | |
3236 | return sock; | |
3237 | } | |
3238 | #endif | |
aa3378df | 3239 | /* |
3240 | * Check if it is a unix domain socket. Unix domain displays are in | |
3241 | * one of the following formats: unix:d[.s], :d[.s], ::d[.s] | |
3242 | */ | |
5260325f | 3243 | if (strncmp(display, "unix:", 5) == 0 || |
3244 | display[0] == ':') { | |
3245 | /* Connect to the unix domain socket. */ | |
4f16046f | 3246 | if (sscanf(strrchr(display, ':') + 1, "%u", &display_number) != 1) { |
5260325f | 3247 | error("Could not parse display number from DISPLAY: %.100s", |
184eed6a | 3248 | display); |
0b242b12 | 3249 | return -1; |
5260325f | 3250 | } |
3251 | /* Create a socket. */ | |
3252 | sock = connect_local_xsocket(display_number); | |
3253 | if (sock < 0) | |
0b242b12 | 3254 | return -1; |
5260325f | 3255 | |
3256 | /* OK, we now have a connection to the display. */ | |
0b242b12 | 3257 | return sock; |
5260325f | 3258 | } |
aa3378df | 3259 | /* |
3260 | * Connect to an inet socket. The DISPLAY value is supposedly | |
3261 | * hostname:d[.s], where hostname may also be numeric IP address. | |
3262 | */ | |
74860245 | 3263 | strlcpy(buf, display, sizeof(buf)); |
5260325f | 3264 | cp = strchr(buf, ':'); |
3265 | if (!cp) { | |
3266 | error("Could not find ':' in DISPLAY: %.100s", display); | |
0b242b12 | 3267 | return -1; |
5260325f | 3268 | } |
3269 | *cp = 0; | |
aa3378df | 3270 | /* buf now contains the host name. But first we parse the display number. */ |
4f16046f | 3271 | if (sscanf(cp + 1, "%u", &display_number) != 1) { |
5260325f | 3272 | error("Could not parse display number from DISPLAY: %.100s", |
184eed6a | 3273 | display); |
0b242b12 | 3274 | return -1; |
5260325f | 3275 | } |
5260325f | 3276 | |
48e671d5 | 3277 | /* Look up the host address */ |
3278 | memset(&hints, 0, sizeof(hints)); | |
3279 | hints.ai_family = IPv4or6; | |
3280 | hints.ai_socktype = SOCK_STREAM; | |
4f16046f | 3281 | snprintf(strport, sizeof strport, "%u", 6000 + display_number); |
48e671d5 | 3282 | if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) { |
bb4626fe | 3283 | error("%.100s: unknown host. (%s)", buf, |
3284 | ssh_gai_strerror(gaierr)); | |
0b242b12 | 3285 | return -1; |
8efc0c15 | 3286 | } |
48e671d5 | 3287 | for (ai = aitop; ai; ai = ai->ai_next) { |
3288 | /* Create a socket. */ | |
fe7dba42 | 3289 | sock = socket_rdomain(ai->ai_family, ai->ai_socktype, |
3290 | ai->ai_protocol, channel_rdomain); | |
48e671d5 | 3291 | if (sock < 0) { |
d7ac5f18 | 3292 | debug2("socket: %.100s", strerror(errno)); |
7368a6c8 | 3293 | continue; |
3294 | } | |
3295 | /* Connect it to the display. */ | |
3296 | if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) { | |
4f16046f | 3297 | debug2("connect %.100s port %u: %.100s", buf, |
7368a6c8 | 3298 | 6000 + display_number, strerror(errno)); |
3299 | close(sock); | |
3300 | continue; | |
3301 | } | |
3302 | /* Success */ | |
3303 | break; | |
48e671d5 | 3304 | } |
48e671d5 | 3305 | freeaddrinfo(aitop); |
3306 | if (!ai) { | |
4f16046f | 3307 | error("connect %.100s port %u: %.100s", buf, 6000 + display_number, |
48e671d5 | 3308 | strerror(errno)); |
0b242b12 | 3309 | return -1; |
8efc0c15 | 3310 | } |
bcc0381e | 3311 | set_nodelay(sock); |
0b242b12 | 3312 | return sock; |
3313 | } | |
5260325f | 3314 | |
0b242b12 | 3315 | /* |
3316 | * This is called when SSH_SMSG_X11_OPEN is received. The packet contains | |
3317 | * the remote channel number. We should do whatever we want, and respond | |
3318 | * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE. | |
3319 | */ | |
5260325f | 3320 | |
ebb90778 | 3321 | /* ARGSUSED */ |
0b242b12 | 3322 | void |
7819b5c3 | 3323 | x11_input_open(int type, u_int32_t seq, void *ctxt) |
0b242b12 | 3324 | { |
719fc62f | 3325 | Channel *c = NULL; |
3326 | int remote_id, sock = 0; | |
0b242b12 | 3327 | char *remote_host; |
5260325f | 3328 | |
719fc62f | 3329 | debug("Received X11 open request."); |
5260325f | 3330 | |
719fc62f | 3331 | remote_id = packet_get_int(); |
8e7895b8 | 3332 | |
3333 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) { | |
719fc62f | 3334 | remote_host = packet_get_string(NULL); |
0b242b12 | 3335 | } else { |
3336 | remote_host = xstrdup("unknown (remote did not supply name)"); | |
0b242b12 | 3337 | } |
95500969 | 3338 | packet_check_eom(); |
0b242b12 | 3339 | |
3340 | /* Obtain a connection to the real X display. */ | |
3341 | sock = x11_connect_display(); | |
719fc62f | 3342 | if (sock != -1) { |
3343 | /* Allocate a channel for this connection. */ | |
3344 | c = channel_new("connected x11 socket", | |
3345 | SSH_CHANNEL_X11_OPEN, sock, sock, -1, 0, 0, 0, | |
3346 | remote_host, 1); | |
3a0d3d54 | 3347 | c->remote_id = remote_id; |
3348 | c->force_drain = 1; | |
719fc62f | 3349 | } |
0d942eff | 3350 | xfree(remote_host); |
719fc62f | 3351 | if (c == NULL) { |
0b242b12 | 3352 | /* Send refusal to the remote host. */ |
3353 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
719fc62f | 3354 | packet_put_int(remote_id); |
0b242b12 | 3355 | } else { |
0b242b12 | 3356 | /* Send a confirmation to the remote host. */ |
3357 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
719fc62f | 3358 | packet_put_int(remote_id); |
3359 | packet_put_int(c->self); | |
0b242b12 | 3360 | } |
719fc62f | 3361 | packet_send(); |
8efc0c15 | 3362 | } |
3363 | ||
a22aff1f | 3364 | /* dummy protocol handler that denies SSH-1 requests (agent/x11) */ |
ebb90778 | 3365 | /* ARGSUSED */ |
a22aff1f | 3366 | void |
7819b5c3 | 3367 | deny_input_open(int type, u_int32_t seq, void *ctxt) |
a22aff1f | 3368 | { |
3369 | int rchan = packet_get_int(); | |
e1feb9bf | 3370 | |
6aacefa7 | 3371 | switch (type) { |
a22aff1f | 3372 | case SSH_SMSG_AGENT_OPEN: |
3373 | error("Warning: ssh server tried agent forwarding."); | |
3374 | break; | |
3375 | case SSH_SMSG_X11_OPEN: | |
3376 | error("Warning: ssh server tried X11 forwarding."); | |
3377 | break; | |
3378 | default: | |
7819b5c3 | 3379 | error("deny_input_open: type %d", type); |
a22aff1f | 3380 | break; |
3381 | } | |
1908529f | 3382 | error("Warning: this is probably a break-in attempt by a malicious server."); |
a22aff1f | 3383 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
3384 | packet_put_int(rchan); | |
3385 | packet_send(); | |
3386 | } | |
3387 | ||
aa3378df | 3388 | /* |
3389 | * Requests forwarding of X11 connections, generates fake authentication | |
3390 | * data, and enables authentication spoofing. | |
8e7895b8 | 3391 | * This should be called in the client only. |
aa3378df | 3392 | */ |
6ae2364d | 3393 | void |
9bf083eb | 3394 | x11_request_forwarding_with_spoofing(int client_session_id, const char *disp, |
0b242b12 | 3395 | const char *proto, const char *data) |
8efc0c15 | 3396 | { |
1e3b8b07 | 3397 | u_int data_len = (u_int) strlen(data) / 2; |
ef07103c | 3398 | u_int i, value; |
5260325f | 3399 | char *new_data; |
3400 | int screen_number; | |
3401 | const char *cp; | |
ca75d7de | 3402 | u_int32_t rnd = 0; |
5260325f | 3403 | |
4297b666 | 3404 | if (x11_saved_display == NULL) |
3405 | x11_saved_display = xstrdup(disp); | |
3406 | else if (strcmp(disp, x11_saved_display) != 0) { | |
ef07103c | 3407 | error("x11_request_forwarding_with_spoofing: different " |
3408 | "$DISPLAY already forwarded"); | |
3409 | return; | |
3410 | } | |
3411 | ||
0875ae22 | 3412 | cp = strchr(disp, ':'); |
5260325f | 3413 | if (cp) |
3414 | cp = strchr(cp, '.'); | |
3415 | if (cp) | |
d6d4897e | 3416 | screen_number = (u_int)strtonum(cp + 1, 0, 400, NULL); |
5260325f | 3417 | else |
3418 | screen_number = 0; | |
3419 | ||
ef07103c | 3420 | if (x11_saved_proto == NULL) { |
3421 | /* Save protocol name. */ | |
3422 | x11_saved_proto = xstrdup(proto); | |
3423 | /* | |
56964485 | 3424 | * Extract real authentication data and generate fake data |
ef07103c | 3425 | * of the same length. |
3426 | */ | |
3427 | x11_saved_data = xmalloc(data_len); | |
3428 | x11_fake_data = xmalloc(data_len); | |
3429 | for (i = 0; i < data_len; i++) { | |
3430 | if (sscanf(data + 2 * i, "%2x", &value) != 1) | |
3431 | fatal("x11_request_forwarding: bad " | |
3432 | "authentication data: %.100s", data); | |
3433 | if (i % 4 == 0) | |
3434 | rnd = arc4random(); | |
3435 | x11_saved_data[i] = value; | |
3436 | x11_fake_data[i] = rnd & 0xff; | |
3437 | rnd >>= 8; | |
3438 | } | |
3439 | x11_saved_data_len = data_len; | |
3440 | x11_fake_data_len = data_len; | |
3441 | } | |
5260325f | 3442 | |
3443 | /* Convert the fake data into hex. */ | |
ef07103c | 3444 | new_data = tohex(x11_fake_data, data_len); |
5260325f | 3445 | |
3446 | /* Send the request packet. */ | |
0b242b12 | 3447 | if (compat20) { |
3448 | channel_request_start(client_session_id, "x11-req", 0); | |
3449 | packet_put_char(0); /* XXX bool single connection */ | |
3450 | } else { | |
3451 | packet_start(SSH_CMSG_X11_REQUEST_FORWARDING); | |
3452 | } | |
3453 | packet_put_cstring(proto); | |
3454 | packet_put_cstring(new_data); | |
5260325f | 3455 | packet_put_int(screen_number); |
3456 | packet_send(); | |
3457 | packet_write_wait(); | |
3458 | xfree(new_data); | |
8efc0c15 | 3459 | } |
3460 | ||
8e7895b8 | 3461 | |
3462 | /* -- agent forwarding */ | |
3463 | ||
8efc0c15 | 3464 | /* Sends a message to the server to request authentication fd forwarding. */ |
3465 | ||
6ae2364d | 3466 | void |
d5bb9418 | 3467 | auth_request_forwarding(void) |
8efc0c15 | 3468 | { |
5260325f | 3469 | packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING); |
3470 | packet_send(); | |
3471 | packet_write_wait(); | |
8efc0c15 | 3472 | } |