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1760c982 | 1 | /* $OpenBSD: channels.c,v 1.278 2008/06/10 04:50:25 dtucker Exp $ */ |
8efc0c15 | 2 | /* |
5260325f | 3 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
5260325f | 4 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
5 | * All rights reserved | |
5260325f | 6 | * This file contains functions for generic socket connection forwarding. |
7 | * There is also code for initiating connection forwarding for X11 connections, | |
8 | * arbitrary tcp/ip connections, and the authentication agent connection. | |
6ae2364d | 9 | * |
bcbf86ec | 10 | * As far as I am concerned, the code I have written for this software |
11 | * can be used freely for any purpose. Any derived versions of this | |
12 | * software must be clearly marked as such, and if the derived work is | |
13 | * incompatible with the protocol description in the RFC file, it must be | |
14 | * called by a name other than "ssh" or "Secure Shell". | |
15 | * | |
7e7327a1 | 16 | * SSH2 support added by Markus Friedl. |
8341f420 | 17 | * Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved. |
bcbf86ec | 18 | * Copyright (c) 1999 Dug Song. All rights reserved. |
19 | * Copyright (c) 1999 Theo de Raadt. All rights reserved. | |
20 | * | |
21 | * Redistribution and use in source and binary forms, with or without | |
22 | * modification, are permitted provided that the following conditions | |
23 | * are met: | |
24 | * 1. Redistributions of source code must retain the above copyright | |
25 | * notice, this list of conditions and the following disclaimer. | |
26 | * 2. Redistributions in binary form must reproduce the above copyright | |
27 | * notice, this list of conditions and the following disclaimer in the | |
28 | * documentation and/or other materials provided with the distribution. | |
29 | * | |
30 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
31 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
32 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
33 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
34 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
35 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
36 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
37 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
38 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
39 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
5260325f | 40 | */ |
8efc0c15 | 41 | |
42 | #include "includes.h" | |
bd7c69ea | 43 | |
cebb4c24 | 44 | #include <sys/types.h> |
31652869 | 45 | #include <sys/ioctl.h> |
cebb4c24 | 46 | #include <sys/un.h> |
319d6b41 | 47 | #include <sys/socket.h> |
e264ac72 | 48 | #ifdef HAVE_SYS_TIME_H |
49 | # include <sys/time.h> | |
50 | #endif | |
319d6b41 | 51 | |
52 | #include <netinet/in.h> | |
53 | #include <arpa/inet.h> | |
1d3e026f | 54 | |
028094f4 | 55 | #include <errno.h> |
28cb0a43 | 56 | #include <netdb.h> |
cf851879 | 57 | #include <stdio.h> |
ffa517a8 | 58 | #include <stdlib.h> |
00146caa | 59 | #include <string.h> |
1d3e026f | 60 | #include <termios.h> |
5188ba17 | 61 | #include <unistd.h> |
31652869 | 62 | #include <stdarg.h> |
8efc0c15 | 63 | |
3593bdc0 | 64 | #include "openbsd-compat/sys-queue.h" |
31652869 | 65 | #include "xmalloc.h" |
8efc0c15 | 66 | #include "ssh.h" |
42f11eb2 | 67 | #include "ssh1.h" |
68 | #include "ssh2.h" | |
8efc0c15 | 69 | #include "packet.h" |
42f11eb2 | 70 | #include "log.h" |
71 | #include "misc.h" | |
31652869 | 72 | #include "buffer.h" |
8efc0c15 | 73 | #include "channels.h" |
8efc0c15 | 74 | #include "compat.h" |
42f11eb2 | 75 | #include "canohost.h" |
4c8722d9 | 76 | #include "key.h" |
77 | #include "authfd.h" | |
805e659f | 78 | #include "pathnames.h" |
8efc0c15 | 79 | |
8e7895b8 | 80 | /* -- channel core */ |
8efc0c15 | 81 | |
aa3378df | 82 | /* |
83 | * Pointer to an array containing all allocated channels. The array is | |
84 | * dynamically extended as needed. | |
85 | */ | |
719fc62f | 86 | static Channel **channels = NULL; |
8efc0c15 | 87 | |
aa3378df | 88 | /* |
89 | * Size of the channel array. All slots of the array must always be | |
719fc62f | 90 | * initialized (at least the type field); unused slots set to NULL |
aa3378df | 91 | */ |
9a995072 | 92 | static u_int channels_alloc = 0; |
8efc0c15 | 93 | |
aa3378df | 94 | /* |
95 | * Maximum file descriptor value used in any of the channels. This is | |
719fc62f | 96 | * updated in channel_new. |
aa3378df | 97 | */ |
39929cdb | 98 | static int channel_max_fd = 0; |
8efc0c15 | 99 | |
8efc0c15 | 100 | |
8e7895b8 | 101 | /* -- tcp forwarding */ |
8efc0c15 | 102 | |
aa3378df | 103 | /* |
104 | * Data structure for storing which hosts are permitted for forward requests. | |
105 | * The local sides of any remote forwards are stored in this array to prevent | |
106 | * a corrupt remote server from accessing arbitrary TCP/IP ports on our local | |
107 | * network (which might be behind a firewall). | |
108 | */ | |
5260325f | 109 | typedef struct { |
7368a6c8 | 110 | char *host_to_connect; /* Connect to 'host'. */ |
111 | u_short port_to_connect; /* Connect to 'port'. */ | |
112 | u_short listen_port; /* Remote side should listen port number. */ | |
8efc0c15 | 113 | } ForwardPermission; |
114 | ||
2fefbadf | 115 | /* List of all permitted host/port pairs to connect by the user. */ |
8efc0c15 | 116 | static ForwardPermission permitted_opens[SSH_MAX_FORWARDS_PER_DIRECTION]; |
8e7895b8 | 117 | |
2fefbadf | 118 | /* List of all permitted host/port pairs to connect by the admin. */ |
119 | static ForwardPermission permitted_adm_opens[SSH_MAX_FORWARDS_PER_DIRECTION]; | |
120 | ||
121 | /* Number of permitted host/port pairs in the array permitted by the user. */ | |
8efc0c15 | 122 | static int num_permitted_opens = 0; |
2fefbadf | 123 | |
124 | /* Number of permitted host/port pair in the array permitted by the admin. */ | |
125 | static int num_adm_permitted_opens = 0; | |
126 | ||
aa3378df | 127 | /* |
128 | * If this is true, all opens are permitted. This is the case on the server | |
129 | * on which we have to trust the client anyway, and the user could do | |
130 | * anything after logging in anyway. | |
131 | */ | |
8efc0c15 | 132 | static int all_opens_permitted = 0; |
133 | ||
8efc0c15 | 134 | |
8e7895b8 | 135 | /* -- X11 forwarding */ |
42f11eb2 | 136 | |
8e7895b8 | 137 | /* Maximum number of fake X11 displays to try. */ |
138 | #define MAX_DISPLAYS 1000 | |
0490e609 | 139 | |
ef07103c | 140 | /* Saved X11 local (client) display. */ |
141 | static char *x11_saved_display = NULL; | |
142 | ||
8e7895b8 | 143 | /* Saved X11 authentication protocol name. */ |
144 | static char *x11_saved_proto = NULL; | |
8efc0c15 | 145 | |
8e7895b8 | 146 | /* Saved X11 authentication data. This is the real data. */ |
147 | static char *x11_saved_data = NULL; | |
148 | static u_int x11_saved_data_len = 0; | |
149 | ||
150 | /* | |
151 | * Fake X11 authentication data. This is what the server will be sending us; | |
152 | * we should replace any occurrences of this by the real data. | |
153 | */ | |
338eb2ab | 154 | static u_char *x11_fake_data = NULL; |
8e7895b8 | 155 | static u_int x11_fake_data_len; |
156 | ||
157 | ||
158 | /* -- agent forwarding */ | |
8efc0c15 | 159 | |
8e7895b8 | 160 | #define NUM_SOCKS 10 |
161 | ||
8e7895b8 | 162 | /* AF_UNSPEC or AF_INET or AF_INET6 */ |
5e4a7219 | 163 | static int IPv4or6 = AF_UNSPEC; |
8e7895b8 | 164 | |
165 | /* helper */ | |
396c147e | 166 | static void port_open_helper(Channel *c, char *rtype); |
8e7895b8 | 167 | |
e07e21ad | 168 | /* non-blocking connect helpers */ |
169 | static int connect_next(struct channel_connect *); | |
170 | static void channel_connect_ctx_free(struct channel_connect *); | |
171 | ||
8e7895b8 | 172 | /* -- channel core */ |
7368a6c8 | 173 | |
174 | Channel * | |
b872f7f0 | 175 | channel_by_id(int id) |
7368a6c8 | 176 | { |
177 | Channel *c; | |
719fc62f | 178 | |
9a995072 | 179 | if (id < 0 || (u_int)id >= channels_alloc) { |
b872f7f0 | 180 | logit("channel_by_id: %d: bad id", id); |
7368a6c8 | 181 | return NULL; |
182 | } | |
719fc62f | 183 | c = channels[id]; |
184 | if (c == NULL) { | |
b872f7f0 | 185 | logit("channel_by_id: %d: bad id: channel free", id); |
7368a6c8 | 186 | return NULL; |
187 | } | |
188 | return c; | |
189 | } | |
190 | ||
b872f7f0 | 191 | /* |
192 | * Returns the channel if it is allowed to receive protocol messages. | |
193 | * Private channels, like listening sockets, may not receive messages. | |
194 | */ | |
195 | Channel * | |
196 | channel_lookup(int id) | |
197 | { | |
198 | Channel *c; | |
199 | ||
200 | if ((c = channel_by_id(id)) == NULL) | |
201 | return (NULL); | |
202 | ||
c8e9c167 | 203 | switch (c->type) { |
b872f7f0 | 204 | case SSH_CHANNEL_X11_OPEN: |
205 | case SSH_CHANNEL_LARVAL: | |
206 | case SSH_CHANNEL_CONNECTING: | |
207 | case SSH_CHANNEL_DYNAMIC: | |
208 | case SSH_CHANNEL_OPENING: | |
209 | case SSH_CHANNEL_OPEN: | |
210 | case SSH_CHANNEL_INPUT_DRAINING: | |
211 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
212 | return (c); | |
b872f7f0 | 213 | } |
214 | logit("Non-public channel %d, type %d.", id, c->type); | |
215 | return (NULL); | |
216 | } | |
217 | ||
aa3378df | 218 | /* |
1d1ffb87 | 219 | * Register filedescriptors for a channel, used when allocating a channel or |
0fbe8c74 | 220 | * when the channel consumer/producer is ready, e.g. shell exec'd |
aa3378df | 221 | */ |
396c147e | 222 | static void |
a22aff1f | 223 | channel_register_fds(Channel *c, int rfd, int wfd, int efd, |
224 | int extusage, int nonblock) | |
8efc0c15 | 225 | { |
5260325f | 226 | /* Update the maximum file descriptor value. */ |
39929cdb | 227 | channel_max_fd = MAX(channel_max_fd, rfd); |
228 | channel_max_fd = MAX(channel_max_fd, wfd); | |
229 | channel_max_fd = MAX(channel_max_fd, efd); | |
230 | ||
aa3378df | 231 | /* XXX set close-on-exec -markus */ |
1d1ffb87 | 232 | |
0fbe8c74 | 233 | c->rfd = rfd; |
234 | c->wfd = wfd; | |
235 | c->sock = (rfd == wfd) ? rfd : -1; | |
5e96b616 | 236 | c->ctl_fd = -1; /* XXX: set elsewhere */ |
0fbe8c74 | 237 | c->efd = efd; |
238 | c->extended_usage = extusage; | |
a22aff1f | 239 | |
0ae4fe1d | 240 | /* XXX ugly hack: nonblock is only set by the server */ |
241 | if (nonblock && isatty(c->rfd)) { | |
d7ac5f18 | 242 | debug2("channel %d: rfd %d isatty", c->self, c->rfd); |
0ae4fe1d | 243 | c->isatty = 1; |
244 | if (!isatty(c->wfd)) { | |
94dfb550 | 245 | error("channel %d: wfd %d is not a tty?", |
0ae4fe1d | 246 | c->self, c->wfd); |
247 | } | |
248 | } else { | |
249 | c->isatty = 0; | |
250 | } | |
21c2c5cd | 251 | c->wfd_isatty = 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); |
70bef40e | 308 | c->ostate = CHAN_OUTPUT_OPEN; |
309 | c->istate = CHAN_INPUT_OPEN; | |
310 | c->flags = 0; | |
a22aff1f | 311 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock); |
5260325f | 312 | c->self = found; |
313 | c->type = type; | |
7368a6c8 | 314 | c->ctype = ctype; |
0b242b12 | 315 | c->local_window = window; |
316 | c->local_window_max = window; | |
317 | c->local_consumed = 0; | |
318 | c->local_maxpacket = maxpack; | |
5260325f | 319 | c->remote_id = -1; |
0d942eff | 320 | c->remote_name = xstrdup(remote_name); |
7368a6c8 | 321 | c->remote_window = 0; |
322 | c->remote_maxpacket = 0; | |
a5f82435 | 323 | c->force_drain = 0; |
ac151b18 | 324 | c->single_connection = 0; |
3cf2be58 | 325 | c->detach_user = NULL; |
8cd0437d | 326 | c->detach_close = 0; |
3593bdc0 | 327 | c->open_confirm = NULL; |
328 | c->open_confirm_ctx = NULL; | |
2e73a022 | 329 | c->input_filter = NULL; |
c1c6a032 | 330 | c->output_filter = NULL; |
3593bdc0 | 331 | TAILQ_INIT(&c->status_confirms); |
5260325f | 332 | debug("channel %d: new [%s]", found, remote_name); |
719fc62f | 333 | return c; |
7368a6c8 | 334 | } |
8efc0c15 | 335 | |
489aa2e9 | 336 | static int |
337 | channel_find_maxfd(void) | |
338 | { | |
9a995072 | 339 | u_int i; |
340 | int max = 0; | |
489aa2e9 | 341 | Channel *c; |
342 | ||
343 | for (i = 0; i < channels_alloc; i++) { | |
344 | c = channels[i]; | |
345 | if (c != NULL) { | |
346 | max = MAX(max, c->rfd); | |
347 | max = MAX(max, c->wfd); | |
348 | max = MAX(max, c->efd); | |
349 | } | |
350 | } | |
351 | return max; | |
352 | } | |
353 | ||
354 | int | |
355 | channel_close_fd(int *fdp) | |
356 | { | |
357 | int ret = 0, fd = *fdp; | |
358 | ||
359 | if (fd != -1) { | |
360 | ret = close(fd); | |
361 | *fdp = -1; | |
362 | if (fd == channel_max_fd) | |
363 | channel_max_fd = channel_find_maxfd(); | |
364 | } | |
365 | return ret; | |
366 | } | |
367 | ||
0fbe8c74 | 368 | /* Close all channel fd/socket. */ |
396c147e | 369 | static void |
0fbe8c74 | 370 | channel_close_fds(Channel *c) |
371 | { | |
5e96b616 | 372 | debug3("channel %d: close_fds r %d w %d e %d c %d", |
373 | c->self, c->rfd, c->wfd, c->efd, c->ctl_fd); | |
6fd8622b | 374 | |
489aa2e9 | 375 | channel_close_fd(&c->sock); |
5e96b616 | 376 | channel_close_fd(&c->ctl_fd); |
489aa2e9 | 377 | channel_close_fd(&c->rfd); |
378 | channel_close_fd(&c->wfd); | |
379 | channel_close_fd(&c->efd); | |
0fbe8c74 | 380 | } |
381 | ||
8e7895b8 | 382 | /* Free the channel and close its fd/socket. */ |
8e7895b8 | 383 | void |
384 | channel_free(Channel *c) | |
385 | { | |
386 | char *s; | |
9a995072 | 387 | u_int i, n; |
3593bdc0 | 388 | struct channel_confirm *cc; |
8e7895b8 | 389 | |
390 | for (n = 0, i = 0; i < channels_alloc; i++) | |
391 | if (channels[i]) | |
392 | n++; | |
9a995072 | 393 | debug("channel %d: free: %s, nchannels %u", c->self, |
8e7895b8 | 394 | c->remote_name ? c->remote_name : "???", n); |
395 | ||
396 | s = channel_open_message(); | |
d7ac5f18 | 397 | debug3("channel %d: status: %s", c->self, s); |
8e7895b8 | 398 | xfree(s); |
399 | ||
8e7895b8 | 400 | if (c->sock != -1) |
401 | shutdown(c->sock, SHUT_RDWR); | |
5e96b616 | 402 | if (c->ctl_fd != -1) |
403 | shutdown(c->ctl_fd, SHUT_RDWR); | |
8e7895b8 | 404 | channel_close_fds(c); |
405 | buffer_free(&c->input); | |
406 | buffer_free(&c->output); | |
407 | buffer_free(&c->extended); | |
408 | if (c->remote_name) { | |
409 | xfree(c->remote_name); | |
410 | c->remote_name = NULL; | |
411 | } | |
3593bdc0 | 412 | while ((cc = TAILQ_FIRST(&c->status_confirms)) != NULL) { |
413 | if (cc->abandon_cb != NULL) | |
414 | cc->abandon_cb(c, cc->ctx); | |
415 | TAILQ_REMOVE(&c->status_confirms, cc, entry); | |
416 | bzero(cc, sizeof(*cc)); | |
417 | xfree(cc); | |
418 | } | |
8e7895b8 | 419 | channels[c->self] = NULL; |
420 | xfree(c); | |
421 | } | |
422 | ||
8e7895b8 | 423 | void |
d6746a0b | 424 | channel_free_all(void) |
8e7895b8 | 425 | { |
9a995072 | 426 | u_int i; |
8e7895b8 | 427 | |
d6746a0b | 428 | for (i = 0; i < channels_alloc; i++) |
429 | if (channels[i] != NULL) | |
430 | channel_free(channels[i]); | |
8e7895b8 | 431 | } |
432 | ||
433 | /* | |
434 | * Closes the sockets/fds of all channels. This is used to close extra file | |
435 | * descriptors after a fork. | |
436 | */ | |
8e7895b8 | 437 | void |
d5bb9418 | 438 | channel_close_all(void) |
8e7895b8 | 439 | { |
9a995072 | 440 | u_int i; |
8e7895b8 | 441 | |
442 | for (i = 0; i < channels_alloc; i++) | |
443 | if (channels[i] != NULL) | |
444 | channel_close_fds(channels[i]); | |
445 | } | |
446 | ||
3cf2be58 | 447 | /* |
448 | * Stop listening to channels. | |
449 | */ | |
3cf2be58 | 450 | void |
451 | channel_stop_listening(void) | |
452 | { | |
9a995072 | 453 | u_int i; |
3cf2be58 | 454 | Channel *c; |
455 | ||
456 | for (i = 0; i < channels_alloc; i++) { | |
457 | c = channels[i]; | |
458 | if (c != NULL) { | |
459 | switch (c->type) { | |
460 | case SSH_CHANNEL_AUTH_SOCKET: | |
461 | case SSH_CHANNEL_PORT_LISTENER: | |
462 | case SSH_CHANNEL_RPORT_LISTENER: | |
463 | case SSH_CHANNEL_X11_LISTENER: | |
489aa2e9 | 464 | channel_close_fd(&c->sock); |
3cf2be58 | 465 | channel_free(c); |
466 | break; | |
467 | } | |
468 | } | |
469 | } | |
470 | } | |
471 | ||
8e7895b8 | 472 | /* |
473 | * Returns true if no channel has too much buffered data, and false if one or | |
474 | * more channel is overfull. | |
475 | */ | |
8e7895b8 | 476 | int |
d5bb9418 | 477 | channel_not_very_much_buffered_data(void) |
8e7895b8 | 478 | { |
479 | u_int i; | |
480 | Channel *c; | |
481 | ||
482 | for (i = 0; i < channels_alloc; i++) { | |
483 | c = channels[i]; | |
484 | if (c != NULL && c->type == SSH_CHANNEL_OPEN) { | |
0c139bd1 | 485 | #if 0 |
486 | if (!compat20 && | |
487 | buffer_len(&c->input) > packet_get_maxsize()) { | |
faa483fa | 488 | debug2("channel %d: big input buffer %d", |
8e7895b8 | 489 | c->self, buffer_len(&c->input)); |
490 | return 0; | |
491 | } | |
0c139bd1 | 492 | #endif |
8e7895b8 | 493 | if (buffer_len(&c->output) > packet_get_maxsize()) { |
a27002e5 | 494 | debug2("channel %d: big output buffer %u > %u", |
0c139bd1 | 495 | c->self, buffer_len(&c->output), |
496 | packet_get_maxsize()); | |
8e7895b8 | 497 | return 0; |
498 | } | |
499 | } | |
500 | } | |
501 | return 1; | |
502 | } | |
503 | ||
504 | /* Returns true if any channel is still open. */ | |
8e7895b8 | 505 | int |
d5bb9418 | 506 | channel_still_open(void) |
8e7895b8 | 507 | { |
9a995072 | 508 | u_int i; |
8e7895b8 | 509 | Channel *c; |
510 | ||
511 | for (i = 0; i < channels_alloc; i++) { | |
512 | c = channels[i]; | |
513 | if (c == NULL) | |
514 | continue; | |
515 | switch (c->type) { | |
516 | case SSH_CHANNEL_X11_LISTENER: | |
517 | case SSH_CHANNEL_PORT_LISTENER: | |
518 | case SSH_CHANNEL_RPORT_LISTENER: | |
519 | case SSH_CHANNEL_CLOSED: | |
520 | case SSH_CHANNEL_AUTH_SOCKET: | |
521 | case SSH_CHANNEL_DYNAMIC: | |
522 | case SSH_CHANNEL_CONNECTING: | |
523 | case SSH_CHANNEL_ZOMBIE: | |
524 | continue; | |
525 | case SSH_CHANNEL_LARVAL: | |
526 | if (!compat20) | |
527 | fatal("cannot happen: SSH_CHANNEL_LARVAL"); | |
528 | continue; | |
529 | case SSH_CHANNEL_OPENING: | |
530 | case SSH_CHANNEL_OPEN: | |
531 | case SSH_CHANNEL_X11_OPEN: | |
532 | return 1; | |
533 | case SSH_CHANNEL_INPUT_DRAINING: | |
534 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
535 | if (!compat13) | |
536 | fatal("cannot happen: OUT_DRAIN"); | |
537 | return 1; | |
538 | default: | |
539 | fatal("channel_still_open: bad channel type %d", c->type); | |
540 | /* NOTREACHED */ | |
541 | } | |
542 | } | |
543 | return 0; | |
544 | } | |
545 | ||
546 | /* Returns the id of an open channel suitable for keepaliving */ | |
8e7895b8 | 547 | int |
d5bb9418 | 548 | channel_find_open(void) |
8e7895b8 | 549 | { |
9a995072 | 550 | u_int i; |
8e7895b8 | 551 | Channel *c; |
552 | ||
553 | for (i = 0; i < channels_alloc; i++) { | |
554 | c = channels[i]; | |
13de3560 | 555 | if (c == NULL || c->remote_id < 0) |
8e7895b8 | 556 | continue; |
557 | switch (c->type) { | |
558 | case SSH_CHANNEL_CLOSED: | |
559 | case SSH_CHANNEL_DYNAMIC: | |
560 | case SSH_CHANNEL_X11_LISTENER: | |
561 | case SSH_CHANNEL_PORT_LISTENER: | |
562 | case SSH_CHANNEL_RPORT_LISTENER: | |
563 | case SSH_CHANNEL_OPENING: | |
564 | case SSH_CHANNEL_CONNECTING: | |
565 | case SSH_CHANNEL_ZOMBIE: | |
566 | continue; | |
567 | case SSH_CHANNEL_LARVAL: | |
568 | case SSH_CHANNEL_AUTH_SOCKET: | |
569 | case SSH_CHANNEL_OPEN: | |
570 | case SSH_CHANNEL_X11_OPEN: | |
571 | return i; | |
572 | case SSH_CHANNEL_INPUT_DRAINING: | |
573 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
574 | if (!compat13) | |
575 | fatal("cannot happen: OUT_DRAIN"); | |
576 | return i; | |
577 | default: | |
578 | fatal("channel_find_open: bad channel type %d", c->type); | |
579 | /* NOTREACHED */ | |
580 | } | |
581 | } | |
582 | return -1; | |
583 | } | |
584 | ||
585 | ||
586 | /* | |
587 | * Returns a message describing the currently open forwarded connections, | |
588 | * suitable for sending to the client. The message contains crlf pairs for | |
589 | * newlines. | |
590 | */ | |
8e7895b8 | 591 | char * |
d5bb9418 | 592 | channel_open_message(void) |
8e7895b8 | 593 | { |
594 | Buffer buffer; | |
595 | Channel *c; | |
596 | char buf[1024], *cp; | |
9a995072 | 597 | u_int i; |
8e7895b8 | 598 | |
599 | buffer_init(&buffer); | |
600 | snprintf(buf, sizeof buf, "The following connections are open:\r\n"); | |
601 | buffer_append(&buffer, buf, strlen(buf)); | |
602 | for (i = 0; i < channels_alloc; i++) { | |
603 | c = channels[i]; | |
604 | if (c == NULL) | |
605 | continue; | |
606 | switch (c->type) { | |
607 | case SSH_CHANNEL_X11_LISTENER: | |
608 | case SSH_CHANNEL_PORT_LISTENER: | |
609 | case SSH_CHANNEL_RPORT_LISTENER: | |
610 | case SSH_CHANNEL_CLOSED: | |
611 | case SSH_CHANNEL_AUTH_SOCKET: | |
612 | case SSH_CHANNEL_ZOMBIE: | |
613 | continue; | |
614 | case SSH_CHANNEL_LARVAL: | |
615 | case SSH_CHANNEL_OPENING: | |
616 | case SSH_CHANNEL_CONNECTING: | |
617 | case SSH_CHANNEL_DYNAMIC: | |
618 | case SSH_CHANNEL_OPEN: | |
619 | case SSH_CHANNEL_X11_OPEN: | |
620 | case SSH_CHANNEL_INPUT_DRAINING: | |
621 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
5e96b616 | 622 | snprintf(buf, sizeof buf, |
623 | " #%d %.300s (t%d r%d i%d/%d o%d/%d fd %d/%d cfd %d)\r\n", | |
8e7895b8 | 624 | c->self, c->remote_name, |
625 | c->type, c->remote_id, | |
626 | c->istate, buffer_len(&c->input), | |
627 | c->ostate, buffer_len(&c->output), | |
5e96b616 | 628 | c->rfd, c->wfd, c->ctl_fd); |
8e7895b8 | 629 | buffer_append(&buffer, buf, strlen(buf)); |
630 | continue; | |
631 | default: | |
632 | fatal("channel_open_message: bad channel type %d", c->type); | |
633 | /* NOTREACHED */ | |
634 | } | |
635 | } | |
636 | buffer_append(&buffer, "\0", 1); | |
637 | cp = xstrdup(buffer_ptr(&buffer)); | |
638 | buffer_free(&buffer); | |
639 | return cp; | |
640 | } | |
641 | ||
642 | void | |
643 | channel_send_open(int id) | |
644 | { | |
645 | Channel *c = channel_lookup(id); | |
e1feb9bf | 646 | |
8e7895b8 | 647 | if (c == NULL) { |
bbe88b6d | 648 | logit("channel_send_open: %d: bad id", id); |
8e7895b8 | 649 | return; |
650 | } | |
6226a8f8 | 651 | debug2("channel %d: send open", id); |
8e7895b8 | 652 | packet_start(SSH2_MSG_CHANNEL_OPEN); |
653 | packet_put_cstring(c->ctype); | |
654 | packet_put_int(c->self); | |
655 | packet_put_int(c->local_window); | |
656 | packet_put_int(c->local_maxpacket); | |
657 | packet_send(); | |
658 | } | |
659 | ||
660 | void | |
6226a8f8 | 661 | channel_request_start(int id, char *service, int wantconfirm) |
8e7895b8 | 662 | { |
6226a8f8 | 663 | Channel *c = channel_lookup(id); |
e1feb9bf | 664 | |
8e7895b8 | 665 | if (c == NULL) { |
bbe88b6d | 666 | logit("channel_request_start: %d: unknown channel id", id); |
8e7895b8 | 667 | return; |
668 | } | |
5e96b616 | 669 | debug2("channel %d: request %s confirm %d", id, service, wantconfirm); |
8e7895b8 | 670 | packet_start(SSH2_MSG_CHANNEL_REQUEST); |
671 | packet_put_int(c->remote_id); | |
672 | packet_put_cstring(service); | |
673 | packet_put_char(wantconfirm); | |
674 | } | |
a7137f6b | 675 | |
8e7895b8 | 676 | void |
3593bdc0 | 677 | channel_register_status_confirm(int id, channel_confirm_cb *cb, |
678 | channel_confirm_abandon_cb *abandon_cb, void *ctx) | |
679 | { | |
680 | struct channel_confirm *cc; | |
681 | Channel *c; | |
682 | ||
683 | if ((c = channel_lookup(id)) == NULL) | |
684 | fatal("channel_register_expect: %d: bad id", id); | |
685 | ||
686 | cc = xmalloc(sizeof(*cc)); | |
687 | cc->cb = cb; | |
688 | cc->abandon_cb = abandon_cb; | |
689 | cc->ctx = ctx; | |
690 | TAILQ_INSERT_TAIL(&c->status_confirms, cc, entry); | |
691 | } | |
692 | ||
693 | void | |
694 | channel_register_open_confirm(int id, channel_callback_fn *fn, void *ctx) | |
8e7895b8 | 695 | { |
696 | Channel *c = channel_lookup(id); | |
e1feb9bf | 697 | |
8e7895b8 | 698 | if (c == NULL) { |
3593bdc0 | 699 | logit("channel_register_open_comfirm: %d: bad id", id); |
8e7895b8 | 700 | return; |
701 | } | |
3593bdc0 | 702 | c->open_confirm = fn; |
703 | c->open_confirm_ctx = ctx; | |
8e7895b8 | 704 | } |
a7137f6b | 705 | |
8e7895b8 | 706 | void |
8cd0437d | 707 | channel_register_cleanup(int id, channel_callback_fn *fn, int do_close) |
8e7895b8 | 708 | { |
b872f7f0 | 709 | Channel *c = channel_by_id(id); |
e1feb9bf | 710 | |
8e7895b8 | 711 | if (c == NULL) { |
bbe88b6d | 712 | logit("channel_register_cleanup: %d: bad id", id); |
8e7895b8 | 713 | return; |
714 | } | |
3cf2be58 | 715 | c->detach_user = fn; |
8cd0437d | 716 | c->detach_close = do_close; |
8e7895b8 | 717 | } |
a7137f6b | 718 | |
8e7895b8 | 719 | void |
720 | channel_cancel_cleanup(int id) | |
721 | { | |
b872f7f0 | 722 | Channel *c = channel_by_id(id); |
e1feb9bf | 723 | |
8e7895b8 | 724 | if (c == NULL) { |
bbe88b6d | 725 | logit("channel_cancel_cleanup: %d: bad id", id); |
8e7895b8 | 726 | return; |
727 | } | |
3cf2be58 | 728 | c->detach_user = NULL; |
8cd0437d | 729 | c->detach_close = 0; |
8e7895b8 | 730 | } |
a7137f6b | 731 | |
8e7895b8 | 732 | void |
c1c6a032 | 733 | channel_register_filter(int id, channel_infilter_fn *ifn, |
734 | channel_outfilter_fn *ofn) | |
8e7895b8 | 735 | { |
736 | Channel *c = channel_lookup(id); | |
e1feb9bf | 737 | |
8e7895b8 | 738 | if (c == NULL) { |
bbe88b6d | 739 | logit("channel_register_filter: %d: bad id", id); |
8e7895b8 | 740 | return; |
741 | } | |
c1c6a032 | 742 | c->input_filter = ifn; |
743 | c->output_filter = ofn; | |
8e7895b8 | 744 | } |
745 | ||
6ae2364d | 746 | void |
8e7895b8 | 747 | channel_set_fds(int id, int rfd, int wfd, int efd, |
399d1ea6 | 748 | int extusage, int nonblock, u_int window_max) |
8efc0c15 | 749 | { |
8e7895b8 | 750 | Channel *c = channel_lookup(id); |
e1feb9bf | 751 | |
8e7895b8 | 752 | if (c == NULL || c->type != SSH_CHANNEL_LARVAL) |
753 | fatal("channel_activate for non-larval channel %d.", id); | |
754 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock); | |
755 | c->type = SSH_CHANNEL_OPEN; | |
399d1ea6 | 756 | c->local_window = c->local_window_max = window_max; |
8e7895b8 | 757 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
758 | packet_put_int(c->remote_id); | |
759 | packet_put_int(c->local_window); | |
760 | packet_send(); | |
8efc0c15 | 761 | } |
762 | ||
aa3378df | 763 | /* |
7368a6c8 | 764 | * 'channel_pre*' are called just before select() to add any bits relevant to |
765 | * channels in the select bitmasks. | |
aa3378df | 766 | */ |
7368a6c8 | 767 | /* |
768 | * 'channel_post*': perform any appropriate operations for channels which | |
769 | * have events pending. | |
770 | */ | |
c8e9c167 | 771 | typedef void chan_fn(Channel *c, fd_set *readset, fd_set *writeset); |
7368a6c8 | 772 | chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE]; |
773 | chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE]; | |
8efc0c15 | 774 | |
ebb90778 | 775 | /* ARGSUSED */ |
396c147e | 776 | static void |
c8e9c167 | 777 | channel_pre_listener(Channel *c, fd_set *readset, fd_set *writeset) |
8efc0c15 | 778 | { |
7368a6c8 | 779 | FD_SET(c->sock, readset); |
780 | } | |
5260325f | 781 | |
ebb90778 | 782 | /* ARGSUSED */ |
396c147e | 783 | static void |
c8e9c167 | 784 | channel_pre_connecting(Channel *c, fd_set *readset, fd_set *writeset) |
97fb6912 | 785 | { |
786 | debug3("channel %d: waiting for connection", c->self); | |
787 | FD_SET(c->sock, writeset); | |
788 | } | |
789 | ||
396c147e | 790 | static void |
c8e9c167 | 791 | channel_pre_open_13(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 792 | { |
793 | if (buffer_len(&c->input) < packet_get_maxsize()) | |
794 | FD_SET(c->sock, readset); | |
795 | if (buffer_len(&c->output) > 0) | |
796 | FD_SET(c->sock, writeset); | |
797 | } | |
5260325f | 798 | |
396c147e | 799 | static void |
c8e9c167 | 800 | channel_pre_open(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 801 | { |
0c0738d5 | 802 | u_int limit = compat20 ? c->remote_window : packet_get_maxsize(); |
5260325f | 803 | |
7e7327a1 | 804 | if (c->istate == CHAN_INPUT_OPEN && |
0c0738d5 | 805 | limit > 0 && |
69d9d413 | 806 | buffer_len(&c->input) < limit && |
807 | buffer_check_alloc(&c->input, CHAN_RBUF)) | |
7e7327a1 | 808 | FD_SET(c->rfd, readset); |
809 | if (c->ostate == CHAN_OUTPUT_OPEN || | |
810 | c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { | |
811 | if (buffer_len(&c->output) > 0) { | |
812 | FD_SET(c->wfd, writeset); | |
813 | } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { | |
d2296ed7 | 814 | if (CHANNEL_EFD_OUTPUT_ACTIVE(c)) |
4e2e5cfd | 815 | debug2("channel %d: obuf_empty delayed efd %d/(%d)", |
816 | c->self, c->efd, buffer_len(&c->extended)); | |
d2296ed7 | 817 | else |
818 | chan_obuf_empty(c); | |
7e7327a1 | 819 | } |
820 | } | |
821 | /** XXX check close conditions, too */ | |
271f4a13 | 822 | if (compat20 && c->efd != -1 && |
823 | !(c->istate == CHAN_INPUT_CLOSED && c->ostate == CHAN_OUTPUT_CLOSED)) { | |
7e7327a1 | 824 | if (c->extended_usage == CHAN_EXTENDED_WRITE && |
825 | buffer_len(&c->extended) > 0) | |
826 | FD_SET(c->efd, writeset); | |
d2296ed7 | 827 | else if (!(c->flags & CHAN_EOF_SENT) && |
828 | c->extended_usage == CHAN_EXTENDED_READ && | |
7e7327a1 | 829 | buffer_len(&c->extended) < c->remote_window) |
830 | FD_SET(c->efd, readset); | |
831 | } | |
5e96b616 | 832 | /* XXX: What about efd? races? */ |
f2107e97 | 833 | if (compat20 && c->ctl_fd != -1 && |
5e96b616 | 834 | c->istate == CHAN_INPUT_OPEN && c->ostate == CHAN_OUTPUT_OPEN) |
835 | FD_SET(c->ctl_fd, readset); | |
7e7327a1 | 836 | } |
837 | ||
ebb90778 | 838 | /* ARGSUSED */ |
396c147e | 839 | static void |
c8e9c167 | 840 | channel_pre_input_draining(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 841 | { |
842 | if (buffer_len(&c->input) == 0) { | |
843 | packet_start(SSH_MSG_CHANNEL_CLOSE); | |
844 | packet_put_int(c->remote_id); | |
845 | packet_send(); | |
846 | c->type = SSH_CHANNEL_CLOSED; | |
d7ac5f18 | 847 | debug2("channel %d: closing after input drain.", c->self); |
7368a6c8 | 848 | } |
849 | } | |
5260325f | 850 | |
ebb90778 | 851 | /* ARGSUSED */ |
396c147e | 852 | static void |
c8e9c167 | 853 | channel_pre_output_draining(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 854 | { |
855 | if (buffer_len(&c->output) == 0) | |
719fc62f | 856 | chan_mark_dead(c); |
6ae2364d | 857 | else |
7368a6c8 | 858 | FD_SET(c->sock, writeset); |
859 | } | |
5260325f | 860 | |
7368a6c8 | 861 | /* |
862 | * This is a special state for X11 authentication spoofing. An opened X11 | |
863 | * connection (when authentication spoofing is being done) remains in this | |
864 | * state until the first packet has been completely read. The authentication | |
865 | * data in that packet is then substituted by the real data if it matches the | |
866 | * fake data, and the channel is put into normal mode. | |
0b242b12 | 867 | * XXX All this happens at the client side. |
8e7895b8 | 868 | * Returns: 0 = need more data, -1 = wrong cookie, 1 = ok |
7368a6c8 | 869 | */ |
396c147e | 870 | static int |
8e7895b8 | 871 | x11_open_helper(Buffer *b) |
7368a6c8 | 872 | { |
1e3b8b07 | 873 | u_char *ucp; |
874 | u_int proto_len, data_len; | |
5260325f | 875 | |
7368a6c8 | 876 | /* Check if the fixed size part of the packet is in buffer. */ |
8e7895b8 | 877 | if (buffer_len(b) < 12) |
7368a6c8 | 878 | return 0; |
879 | ||
880 | /* Parse the lengths of variable-length fields. */ | |
20905a8e | 881 | ucp = buffer_ptr(b); |
7368a6c8 | 882 | if (ucp[0] == 0x42) { /* Byte order MSB first. */ |
883 | proto_len = 256 * ucp[6] + ucp[7]; | |
884 | data_len = 256 * ucp[8] + ucp[9]; | |
885 | } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */ | |
886 | proto_len = ucp[6] + 256 * ucp[7]; | |
887 | data_len = ucp[8] + 256 * ucp[9]; | |
888 | } else { | |
d7ac5f18 | 889 | debug2("Initial X11 packet contains bad byte order byte: 0x%x", |
184eed6a | 890 | ucp[0]); |
7368a6c8 | 891 | return -1; |
892 | } | |
5260325f | 893 | |
7368a6c8 | 894 | /* Check if the whole packet is in buffer. */ |
8e7895b8 | 895 | if (buffer_len(b) < |
7368a6c8 | 896 | 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3)) |
897 | return 0; | |
5260325f | 898 | |
7368a6c8 | 899 | /* Check if authentication protocol matches. */ |
900 | if (proto_len != strlen(x11_saved_proto) || | |
901 | memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) { | |
d7ac5f18 | 902 | debug2("X11 connection uses different authentication protocol."); |
7368a6c8 | 903 | return -1; |
904 | } | |
905 | /* Check if authentication data matches our fake data. */ | |
906 | if (data_len != x11_fake_data_len || | |
907 | memcmp(ucp + 12 + ((proto_len + 3) & ~3), | |
908 | x11_fake_data, x11_fake_data_len) != 0) { | |
d7ac5f18 | 909 | debug2("X11 auth data does not match fake data."); |
7368a6c8 | 910 | return -1; |
911 | } | |
912 | /* Check fake data length */ | |
913 | if (x11_fake_data_len != x11_saved_data_len) { | |
914 | error("X11 fake_data_len %d != saved_data_len %d", | |
915 | x11_fake_data_len, x11_saved_data_len); | |
916 | return -1; | |
917 | } | |
918 | /* | |
919 | * Received authentication protocol and data match | |
920 | * our fake data. Substitute the fake data with real | |
921 | * data. | |
922 | */ | |
923 | memcpy(ucp + 12 + ((proto_len + 3) & ~3), | |
924 | x11_saved_data, x11_saved_data_len); | |
925 | return 1; | |
926 | } | |
5260325f | 927 | |
396c147e | 928 | static void |
c8e9c167 | 929 | channel_pre_x11_open_13(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 930 | { |
8e7895b8 | 931 | int ret = x11_open_helper(&c->output); |
e1feb9bf | 932 | |
7368a6c8 | 933 | if (ret == 1) { |
934 | /* Start normal processing for the channel. */ | |
935 | c->type = SSH_CHANNEL_OPEN; | |
a8be9f80 | 936 | channel_pre_open_13(c, readset, writeset); |
7368a6c8 | 937 | } else if (ret == -1) { |
938 | /* | |
939 | * We have received an X11 connection that has bad | |
940 | * authentication information. | |
941 | */ | |
bbe88b6d | 942 | logit("X11 connection rejected because of wrong authentication."); |
7368a6c8 | 943 | buffer_clear(&c->input); |
944 | buffer_clear(&c->output); | |
489aa2e9 | 945 | channel_close_fd(&c->sock); |
7368a6c8 | 946 | c->sock = -1; |
947 | c->type = SSH_CHANNEL_CLOSED; | |
948 | packet_start(SSH_MSG_CHANNEL_CLOSE); | |
949 | packet_put_int(c->remote_id); | |
950 | packet_send(); | |
951 | } | |
952 | } | |
5260325f | 953 | |
396c147e | 954 | static void |
c8e9c167 | 955 | channel_pre_x11_open(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 956 | { |
8e7895b8 | 957 | int ret = x11_open_helper(&c->output); |
a5f82435 | 958 | |
959 | /* c->force_drain = 1; */ | |
960 | ||
7368a6c8 | 961 | if (ret == 1) { |
962 | c->type = SSH_CHANNEL_OPEN; | |
0c0738d5 | 963 | channel_pre_open(c, readset, writeset); |
7368a6c8 | 964 | } else if (ret == -1) { |
bbe88b6d | 965 | logit("X11 connection rejected because of wrong authentication."); |
d7ac5f18 | 966 | debug2("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate); |
8341f420 | 967 | chan_read_failed(c); |
968 | buffer_clear(&c->input); | |
969 | chan_ibuf_empty(c); | |
970 | buffer_clear(&c->output); | |
971 | /* for proto v1, the peer will send an IEOF */ | |
972 | if (compat20) | |
973 | chan_write_failed(c); | |
974 | else | |
975 | c->type = SSH_CHANNEL_OPEN; | |
d7ac5f18 | 976 | debug2("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate); |
7368a6c8 | 977 | } |
978 | } | |
5260325f | 979 | |
28b9cb4d | 980 | /* try to decode a socks4 header */ |
ebb90778 | 981 | /* ARGSUSED */ |
396c147e | 982 | static int |
c8e9c167 | 983 | channel_decode_socks4(Channel *c, fd_set *readset, fd_set *writeset) |
0490e609 | 984 | { |
661e45a0 | 985 | char *p, *host; |
2ceb8101 | 986 | u_int len, have, i, found; |
184eed6a | 987 | char username[256]; |
0490e609 | 988 | struct { |
989 | u_int8_t version; | |
990 | u_int8_t command; | |
991 | u_int16_t dest_port; | |
28b9cb4d | 992 | struct in_addr dest_addr; |
0490e609 | 993 | } s4_req, s4_rsp; |
994 | ||
28b9cb4d | 995 | debug2("channel %d: decode socks4", c->self); |
53b8fe68 | 996 | |
997 | have = buffer_len(&c->input); | |
998 | len = sizeof(s4_req); | |
999 | if (have < len) | |
1000 | return 0; | |
1001 | p = buffer_ptr(&c->input); | |
1002 | for (found = 0, i = len; i < have; i++) { | |
1003 | if (p[i] == '\0') { | |
1004 | found = 1; | |
1005 | break; | |
1006 | } | |
1007 | if (i > 1024) { | |
1008 | /* the peer is probably sending garbage */ | |
1009 | debug("channel %d: decode socks4: too long", | |
1010 | c->self); | |
1011 | return -1; | |
1012 | } | |
1013 | } | |
1014 | if (!found) | |
1015 | return 0; | |
0490e609 | 1016 | buffer_get(&c->input, (char *)&s4_req.version, 1); |
1017 | buffer_get(&c->input, (char *)&s4_req.command, 1); | |
1018 | buffer_get(&c->input, (char *)&s4_req.dest_port, 2); | |
28b9cb4d | 1019 | buffer_get(&c->input, (char *)&s4_req.dest_addr, 4); |
53b8fe68 | 1020 | have = buffer_len(&c->input); |
0490e609 | 1021 | p = buffer_ptr(&c->input); |
1022 | len = strlen(p); | |
6683b40f | 1023 | debug2("channel %d: decode socks4: user %s/%d", c->self, p, len); |
0490e609 | 1024 | if (len > have) |
28b9cb4d | 1025 | fatal("channel %d: decode socks4: len %d > have %d", |
0490e609 | 1026 | c->self, len, have); |
1027 | strlcpy(username, p, sizeof(username)); | |
1028 | buffer_consume(&c->input, len); | |
1029 | buffer_consume(&c->input, 1); /* trailing '\0' */ | |
1030 | ||
28b9cb4d | 1031 | host = inet_ntoa(s4_req.dest_addr); |
0490e609 | 1032 | strlcpy(c->path, host, sizeof(c->path)); |
1033 | c->host_port = ntohs(s4_req.dest_port); | |
184eed6a | 1034 | |
d7ac5f18 | 1035 | debug2("channel %d: dynamic request: socks4 host %s port %u command %u", |
6683b40f | 1036 | c->self, host, c->host_port, s4_req.command); |
0490e609 | 1037 | |
28b9cb4d | 1038 | if (s4_req.command != 1) { |
1039 | debug("channel %d: cannot handle: socks4 cn %d", | |
1040 | c->self, s4_req.command); | |
1041 | return -1; | |
0490e609 | 1042 | } |
28b9cb4d | 1043 | s4_rsp.version = 0; /* vn: 0 for reply */ |
1044 | s4_rsp.command = 90; /* cd: req granted */ | |
0490e609 | 1045 | s4_rsp.dest_port = 0; /* ignored */ |
28b9cb4d | 1046 | s4_rsp.dest_addr.s_addr = INADDR_ANY; /* ignored */ |
15dd2c4f | 1047 | buffer_append(&c->output, &s4_rsp, sizeof(s4_rsp)); |
28b9cb4d | 1048 | return 1; |
0490e609 | 1049 | } |
1050 | ||
f49658f5 | 1051 | /* try to decode a socks5 header */ |
1052 | #define SSH_SOCKS5_AUTHDONE 0x1000 | |
1053 | #define SSH_SOCKS5_NOAUTH 0x00 | |
1054 | #define SSH_SOCKS5_IPV4 0x01 | |
1055 | #define SSH_SOCKS5_DOMAIN 0x03 | |
1056 | #define SSH_SOCKS5_IPV6 0x04 | |
1057 | #define SSH_SOCKS5_CONNECT 0x01 | |
1058 | #define SSH_SOCKS5_SUCCESS 0x00 | |
1059 | ||
ebb90778 | 1060 | /* ARGSUSED */ |
f49658f5 | 1061 | static int |
c8e9c167 | 1062 | channel_decode_socks5(Channel *c, fd_set *readset, fd_set *writeset) |
f49658f5 | 1063 | { |
1064 | struct { | |
1065 | u_int8_t version; | |
1066 | u_int8_t command; | |
1067 | u_int8_t reserved; | |
1068 | u_int8_t atyp; | |
1069 | } s5_req, s5_rsp; | |
1070 | u_int16_t dest_port; | |
1071 | u_char *p, dest_addr[255+1]; | |
a217e418 | 1072 | u_int have, need, i, found, nmethods, addrlen, af; |
f49658f5 | 1073 | |
1074 | debug2("channel %d: decode socks5", c->self); | |
1075 | p = buffer_ptr(&c->input); | |
1076 | if (p[0] != 0x05) | |
1077 | return -1; | |
1078 | have = buffer_len(&c->input); | |
1079 | if (!(c->flags & SSH_SOCKS5_AUTHDONE)) { | |
1080 | /* format: ver | nmethods | methods */ | |
aff51935 | 1081 | if (have < 2) |
f49658f5 | 1082 | return 0; |
1083 | nmethods = p[1]; | |
1084 | if (have < nmethods + 2) | |
1085 | return 0; | |
1086 | /* look for method: "NO AUTHENTICATION REQUIRED" */ | |
4f6e2ba9 | 1087 | for (found = 0, i = 2; i < nmethods + 2; i++) { |
d4f40d92 | 1088 | if (p[i] == SSH_SOCKS5_NOAUTH) { |
f49658f5 | 1089 | found = 1; |
1090 | break; | |
1091 | } | |
1092 | } | |
1093 | if (!found) { | |
1094 | debug("channel %d: method SSH_SOCKS5_NOAUTH not found", | |
1095 | c->self); | |
1096 | return -1; | |
1097 | } | |
1098 | buffer_consume(&c->input, nmethods + 2); | |
1099 | buffer_put_char(&c->output, 0x05); /* version */ | |
1100 | buffer_put_char(&c->output, SSH_SOCKS5_NOAUTH); /* method */ | |
1101 | FD_SET(c->sock, writeset); | |
1102 | c->flags |= SSH_SOCKS5_AUTHDONE; | |
1103 | debug2("channel %d: socks5 auth done", c->self); | |
1104 | return 0; /* need more */ | |
1105 | } | |
1106 | debug2("channel %d: socks5 post auth", c->self); | |
1107 | if (have < sizeof(s5_req)+1) | |
1108 | return 0; /* need more */ | |
5b5f6af7 | 1109 | memcpy(&s5_req, p, sizeof(s5_req)); |
f49658f5 | 1110 | if (s5_req.version != 0x05 || |
1111 | s5_req.command != SSH_SOCKS5_CONNECT || | |
1112 | s5_req.reserved != 0x00) { | |
d7ac5f18 | 1113 | debug2("channel %d: only socks5 connect supported", c->self); |
f49658f5 | 1114 | return -1; |
1115 | } | |
f8cc7664 | 1116 | switch (s5_req.atyp){ |
f49658f5 | 1117 | case SSH_SOCKS5_IPV4: |
1118 | addrlen = 4; | |
1119 | af = AF_INET; | |
1120 | break; | |
1121 | case SSH_SOCKS5_DOMAIN: | |
1122 | addrlen = p[sizeof(s5_req)]; | |
1123 | af = -1; | |
1124 | break; | |
1125 | case SSH_SOCKS5_IPV6: | |
1126 | addrlen = 16; | |
1127 | af = AF_INET6; | |
1128 | break; | |
1129 | default: | |
d7ac5f18 | 1130 | debug2("channel %d: bad socks5 atyp %d", c->self, s5_req.atyp); |
f49658f5 | 1131 | return -1; |
1132 | } | |
a217e418 | 1133 | need = sizeof(s5_req) + addrlen + 2; |
1134 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) | |
1135 | need++; | |
1136 | if (have < need) | |
f49658f5 | 1137 | return 0; |
1138 | buffer_consume(&c->input, sizeof(s5_req)); | |
1139 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) | |
1140 | buffer_consume(&c->input, 1); /* host string length */ | |
1141 | buffer_get(&c->input, (char *)&dest_addr, addrlen); | |
1142 | buffer_get(&c->input, (char *)&dest_port, 2); | |
1143 | dest_addr[addrlen] = '\0'; | |
1144 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) | |
f6be21a0 | 1145 | strlcpy(c->path, (char *)dest_addr, sizeof(c->path)); |
f49658f5 | 1146 | else if (inet_ntop(af, dest_addr, c->path, sizeof(c->path)) == NULL) |
1147 | return -1; | |
1148 | c->host_port = ntohs(dest_port); | |
b6453d99 | 1149 | |
d7ac5f18 | 1150 | debug2("channel %d: dynamic request: socks5 host %s port %u command %u", |
f49658f5 | 1151 | c->self, c->path, c->host_port, s5_req.command); |
1152 | ||
1153 | s5_rsp.version = 0x05; | |
1154 | s5_rsp.command = SSH_SOCKS5_SUCCESS; | |
1155 | s5_rsp.reserved = 0; /* ignored */ | |
1156 | s5_rsp.atyp = SSH_SOCKS5_IPV4; | |
1157 | ((struct in_addr *)&dest_addr)->s_addr = INADDR_ANY; | |
1158 | dest_port = 0; /* ignored */ | |
1159 | ||
15dd2c4f | 1160 | buffer_append(&c->output, &s5_rsp, sizeof(s5_rsp)); |
1161 | buffer_append(&c->output, &dest_addr, sizeof(struct in_addr)); | |
1162 | buffer_append(&c->output, &dest_port, sizeof(dest_port)); | |
f49658f5 | 1163 | return 1; |
1164 | } | |
1165 | ||
28b9cb4d | 1166 | /* dynamic port forwarding */ |
396c147e | 1167 | static void |
c8e9c167 | 1168 | channel_pre_dynamic(Channel *c, fd_set *readset, fd_set *writeset) |
28b9cb4d | 1169 | { |
1170 | u_char *p; | |
2ceb8101 | 1171 | u_int have; |
1172 | int ret; | |
28b9cb4d | 1173 | |
1174 | have = buffer_len(&c->input); | |
639cb8ab | 1175 | c->delayed = 0; |
28b9cb4d | 1176 | debug2("channel %d: pre_dynamic: have %d", c->self, have); |
070adba2 | 1177 | /* buffer_dump(&c->input); */ |
28b9cb4d | 1178 | /* check if the fixed size part of the packet is in buffer. */ |
f49658f5 | 1179 | if (have < 3) { |
28b9cb4d | 1180 | /* need more */ |
1181 | FD_SET(c->sock, readset); | |
1182 | return; | |
1183 | } | |
1184 | /* try to guess the protocol */ | |
1185 | p = buffer_ptr(&c->input); | |
1186 | switch (p[0]) { | |
6683b40f | 1187 | case 0x04: |
1188 | ret = channel_decode_socks4(c, readset, writeset); | |
1189 | break; | |
f49658f5 | 1190 | case 0x05: |
1191 | ret = channel_decode_socks5(c, readset, writeset); | |
1192 | break; | |
28b9cb4d | 1193 | default: |
1194 | ret = -1; | |
1195 | break; | |
1196 | } | |
1197 | if (ret < 0) { | |
719fc62f | 1198 | chan_mark_dead(c); |
28b9cb4d | 1199 | } else if (ret == 0) { |
1200 | debug2("channel %d: pre_dynamic: need more", c->self); | |
1201 | /* need more */ | |
1202 | FD_SET(c->sock, readset); | |
1203 | } else { | |
1204 | /* switch to the next state */ | |
1205 | c->type = SSH_CHANNEL_OPENING; | |
1206 | port_open_helper(c, "direct-tcpip"); | |
1207 | } | |
1208 | } | |
0490e609 | 1209 | |
7368a6c8 | 1210 | /* This is our fake X11 server socket. */ |
ebb90778 | 1211 | /* ARGSUSED */ |
396c147e | 1212 | static void |
c8e9c167 | 1213 | channel_post_x11_listener(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1214 | { |
719fc62f | 1215 | Channel *nc; |
7368a6c8 | 1216 | struct sockaddr addr; |
bcc0381e | 1217 | int newsock; |
7368a6c8 | 1218 | socklen_t addrlen; |
865ac82e | 1219 | char buf[16384], *remote_ipaddr; |
0b242b12 | 1220 | int remote_port; |
7368a6c8 | 1221 | |
1222 | if (FD_ISSET(c->sock, readset)) { | |
1223 | debug("X11 connection requested."); | |
1224 | addrlen = sizeof(addr); | |
1225 | newsock = accept(c->sock, &addr, &addrlen); | |
ac151b18 | 1226 | if (c->single_connection) { |
d7ac5f18 | 1227 | debug2("single_connection: closing X11 listener."); |
ac151b18 | 1228 | channel_close_fd(&c->sock); |
1229 | chan_mark_dead(c); | |
1230 | } | |
7368a6c8 | 1231 | if (newsock < 0) { |
1232 | error("accept: %.100s", strerror(errno)); | |
1233 | return; | |
5260325f | 1234 | } |
bcc0381e | 1235 | set_nodelay(newsock); |
865ac82e | 1236 | remote_ipaddr = get_peer_ipaddr(newsock); |
0b242b12 | 1237 | remote_port = get_peer_port(newsock); |
7368a6c8 | 1238 | snprintf(buf, sizeof buf, "X11 connection from %.200s port %d", |
865ac82e | 1239 | remote_ipaddr, remote_port); |
0b242b12 | 1240 | |
719fc62f | 1241 | nc = channel_new("accepted x11 socket", |
0b242b12 | 1242 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
0d942eff | 1243 | c->local_window_max, c->local_maxpacket, 0, buf, 1); |
0b242b12 | 1244 | if (compat20) { |
1245 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1246 | packet_put_cstring("x11"); | |
719fc62f | 1247 | packet_put_int(nc->self); |
ac151b18 | 1248 | packet_put_int(nc->local_window_max); |
1249 | packet_put_int(nc->local_maxpacket); | |
865ac82e | 1250 | /* originator ipaddr and port */ |
1251 | packet_put_cstring(remote_ipaddr); | |
d0c832f3 | 1252 | if (datafellows & SSH_BUG_X11FWD) { |
d7ac5f18 | 1253 | debug2("ssh2 x11 bug compat mode"); |
d0c832f3 | 1254 | } else { |
1255 | packet_put_int(remote_port); | |
1256 | } | |
0b242b12 | 1257 | packet_send(); |
1258 | } else { | |
1259 | packet_start(SSH_SMSG_X11_OPEN); | |
719fc62f | 1260 | packet_put_int(nc->self); |
8e7895b8 | 1261 | if (packet_get_protocol_flags() & |
1262 | SSH_PROTOFLAG_HOST_IN_FWD_OPEN) | |
449c5ba5 | 1263 | packet_put_cstring(buf); |
0b242b12 | 1264 | packet_send(); |
1265 | } | |
865ac82e | 1266 | xfree(remote_ipaddr); |
8efc0c15 | 1267 | } |
8efc0c15 | 1268 | } |
1269 | ||
396c147e | 1270 | static void |
0490e609 | 1271 | port_open_helper(Channel *c, char *rtype) |
1272 | { | |
1273 | int direct; | |
1274 | char buf[1024]; | |
1275 | char *remote_ipaddr = get_peer_ipaddr(c->sock); | |
29798ed0 | 1276 | int remote_port = get_peer_port(c->sock); |
0490e609 | 1277 | |
1278 | direct = (strcmp(rtype, "direct-tcpip") == 0); | |
1279 | ||
1280 | snprintf(buf, sizeof buf, | |
1281 | "%s: listening port %d for %.100s port %d, " | |
1282 | "connect from %.200s port %d", | |
1283 | rtype, c->listening_port, c->path, c->host_port, | |
1284 | remote_ipaddr, remote_port); | |
1285 | ||
1286 | xfree(c->remote_name); | |
1287 | c->remote_name = xstrdup(buf); | |
1288 | ||
1289 | if (compat20) { | |
1290 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1291 | packet_put_cstring(rtype); | |
1292 | packet_put_int(c->self); | |
1293 | packet_put_int(c->local_window_max); | |
1294 | packet_put_int(c->local_maxpacket); | |
1295 | if (direct) { | |
1296 | /* target host, port */ | |
1297 | packet_put_cstring(c->path); | |
1298 | packet_put_int(c->host_port); | |
1299 | } else { | |
1300 | /* listen address, port */ | |
1301 | packet_put_cstring(c->path); | |
1302 | packet_put_int(c->listening_port); | |
1303 | } | |
1304 | /* originator host and port */ | |
1305 | packet_put_cstring(remote_ipaddr); | |
29798ed0 | 1306 | packet_put_int((u_int)remote_port); |
0490e609 | 1307 | packet_send(); |
1308 | } else { | |
1309 | packet_start(SSH_MSG_PORT_OPEN); | |
1310 | packet_put_int(c->self); | |
1311 | packet_put_cstring(c->path); | |
1312 | packet_put_int(c->host_port); | |
8e7895b8 | 1313 | if (packet_get_protocol_flags() & |
1314 | SSH_PROTOFLAG_HOST_IN_FWD_OPEN) | |
0490e609 | 1315 | packet_put_cstring(c->remote_name); |
1316 | packet_send(); | |
1317 | } | |
1318 | xfree(remote_ipaddr); | |
1319 | } | |
1320 | ||
442aee3a | 1321 | static void |
1322 | channel_set_reuseaddr(int fd) | |
1323 | { | |
1324 | int on = 1; | |
1325 | ||
1326 | /* | |
1327 | * Set socket options. | |
1328 | * Allow local port reuse in TIME_WAIT. | |
1329 | */ | |
1330 | if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1) | |
1331 | error("setsockopt SO_REUSEADDR fd %d: %s", fd, strerror(errno)); | |
1332 | } | |
1333 | ||
aa3378df | 1334 | /* |
7368a6c8 | 1335 | * This socket is listening for connections to a forwarded TCP/IP port. |
aa3378df | 1336 | */ |
ebb90778 | 1337 | /* ARGSUSED */ |
396c147e | 1338 | static void |
c8e9c167 | 1339 | channel_post_port_listener(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1340 | { |
0490e609 | 1341 | Channel *nc; |
7368a6c8 | 1342 | struct sockaddr addr; |
719fc62f | 1343 | int newsock, nextstate; |
7368a6c8 | 1344 | socklen_t addrlen; |
0490e609 | 1345 | char *rtype; |
fa08c86b | 1346 | |
7368a6c8 | 1347 | if (FD_ISSET(c->sock, readset)) { |
1348 | debug("Connection to port %d forwarding " | |
1349 | "to %.100s port %d requested.", | |
1350 | c->listening_port, c->path, c->host_port); | |
0490e609 | 1351 | |
639cb8ab | 1352 | if (c->type == SSH_CHANNEL_RPORT_LISTENER) { |
1353 | nextstate = SSH_CHANNEL_OPENING; | |
1354 | rtype = "forwarded-tcpip"; | |
1355 | } else { | |
1356 | if (c->host_port == 0) { | |
1357 | nextstate = SSH_CHANNEL_DYNAMIC; | |
f3964cb9 | 1358 | rtype = "dynamic-tcpip"; |
639cb8ab | 1359 | } else { |
1360 | nextstate = SSH_CHANNEL_OPENING; | |
1361 | rtype = "direct-tcpip"; | |
1362 | } | |
1363 | } | |
0490e609 | 1364 | |
7368a6c8 | 1365 | addrlen = sizeof(addr); |
1366 | newsock = accept(c->sock, &addr, &addrlen); | |
1367 | if (newsock < 0) { | |
1368 | error("accept: %.100s", strerror(errno)); | |
1369 | return; | |
1370 | } | |
811a6342 | 1371 | set_nodelay(newsock); |
0d942eff | 1372 | nc = channel_new(rtype, nextstate, newsock, newsock, -1, |
1373 | c->local_window_max, c->local_maxpacket, 0, rtype, 1); | |
0490e609 | 1374 | nc->listening_port = c->listening_port; |
1375 | nc->host_port = c->host_port; | |
1376 | strlcpy(nc->path, c->path, sizeof(nc->path)); | |
1377 | ||
639cb8ab | 1378 | if (nextstate == SSH_CHANNEL_DYNAMIC) { |
1379 | /* | |
1380 | * do not call the channel_post handler until | |
1381 | * this flag has been reset by a pre-handler. | |
1382 | * otherwise the FD_ISSET calls might overflow | |
1383 | */ | |
1384 | nc->delayed = 1; | |
1385 | } else { | |
0490e609 | 1386 | port_open_helper(nc, rtype); |
639cb8ab | 1387 | } |
7368a6c8 | 1388 | } |
1389 | } | |
8efc0c15 | 1390 | |
7368a6c8 | 1391 | /* |
1392 | * This is the authentication agent socket listening for connections from | |
1393 | * clients. | |
1394 | */ | |
ebb90778 | 1395 | /* ARGSUSED */ |
396c147e | 1396 | static void |
c8e9c167 | 1397 | channel_post_auth_listener(Channel *c, fd_set *readset, fd_set *writeset) |
8efc0c15 | 1398 | { |
719fc62f | 1399 | Channel *nc; |
1400 | int newsock; | |
5260325f | 1401 | struct sockaddr addr; |
48e671d5 | 1402 | socklen_t addrlen; |
5260325f | 1403 | |
7368a6c8 | 1404 | if (FD_ISSET(c->sock, readset)) { |
1405 | addrlen = sizeof(addr); | |
1406 | newsock = accept(c->sock, &addr, &addrlen); | |
1407 | if (newsock < 0) { | |
1408 | error("accept from auth socket: %.100s", strerror(errno)); | |
1409 | return; | |
1410 | } | |
719fc62f | 1411 | nc = channel_new("accepted auth socket", |
fa08c86b | 1412 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
1413 | c->local_window_max, c->local_maxpacket, | |
0d942eff | 1414 | 0, "accepted auth socket", 1); |
fa08c86b | 1415 | if (compat20) { |
1416 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1417 | packet_put_cstring("auth-agent@openssh.com"); | |
719fc62f | 1418 | packet_put_int(nc->self); |
fa08c86b | 1419 | packet_put_int(c->local_window_max); |
1420 | packet_put_int(c->local_maxpacket); | |
1421 | } else { | |
1422 | packet_start(SSH_SMSG_AGENT_OPEN); | |
719fc62f | 1423 | packet_put_int(nc->self); |
fa08c86b | 1424 | } |
7368a6c8 | 1425 | packet_send(); |
1426 | } | |
1427 | } | |
5260325f | 1428 | |
ebb90778 | 1429 | /* ARGSUSED */ |
396c147e | 1430 | static void |
c8e9c167 | 1431 | channel_post_connecting(Channel *c, fd_set *readset, fd_set *writeset) |
97fb6912 | 1432 | { |
e07e21ad | 1433 | int err = 0, sock; |
8ab2cb35 | 1434 | socklen_t sz = sizeof(err); |
d18e0850 | 1435 | |
97fb6912 | 1436 | if (FD_ISSET(c->sock, writeset)) { |
db518d9b | 1437 | if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, &err, &sz) < 0) { |
d18e0850 | 1438 | err = errno; |
1439 | error("getsockopt SO_ERROR failed"); | |
1440 | } | |
1441 | if (err == 0) { | |
e07e21ad | 1442 | debug("channel %d: connected to %s port %d", |
1443 | c->self, c->connect_ctx.host, c->connect_ctx.port); | |
1444 | channel_connect_ctx_free(&c->connect_ctx); | |
d18e0850 | 1445 | c->type = SSH_CHANNEL_OPEN; |
1446 | if (compat20) { | |
1447 | packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1448 | packet_put_int(c->remote_id); | |
1449 | packet_put_int(c->self); | |
1450 | packet_put_int(c->local_window); | |
1451 | packet_put_int(c->local_maxpacket); | |
1452 | } else { | |
1453 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1454 | packet_put_int(c->remote_id); | |
1455 | packet_put_int(c->self); | |
1456 | } | |
97fb6912 | 1457 | } else { |
e07e21ad | 1458 | debug("channel %d: connection failed: %s", |
d18e0850 | 1459 | c->self, strerror(err)); |
e07e21ad | 1460 | /* Try next address, if any */ |
1461 | if ((sock = connect_next(&c->connect_ctx)) > 0) { | |
1462 | close(c->sock); | |
1463 | c->sock = c->rfd = c->wfd = sock; | |
1464 | channel_max_fd = channel_find_maxfd(); | |
1465 | return; | |
1466 | } | |
1467 | /* Exhausted all addresses */ | |
1468 | error("connect_to %.100s port %d: failed.", | |
1469 | c->connect_ctx.host, c->connect_ctx.port); | |
1470 | channel_connect_ctx_free(&c->connect_ctx); | |
d18e0850 | 1471 | if (compat20) { |
1472 | packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); | |
1473 | packet_put_int(c->remote_id); | |
1474 | packet_put_int(SSH2_OPEN_CONNECT_FAILED); | |
1475 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { | |
1476 | packet_put_cstring(strerror(err)); | |
1477 | packet_put_cstring(""); | |
1478 | } | |
97fb6912 | 1479 | } else { |
d18e0850 | 1480 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
1481 | packet_put_int(c->remote_id); | |
97fb6912 | 1482 | } |
d18e0850 | 1483 | chan_mark_dead(c); |
97fb6912 | 1484 | } |
d18e0850 | 1485 | packet_send(); |
97fb6912 | 1486 | } |
1487 | } | |
1488 | ||
ebb90778 | 1489 | /* ARGSUSED */ |
396c147e | 1490 | static int |
c8e9c167 | 1491 | channel_handle_rfd(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1492 | { |
fa1d7d85 | 1493 | char buf[CHAN_RBUF]; |
bd6a1355 | 1494 | int len, force; |
7368a6c8 | 1495 | |
bd6a1355 | 1496 | force = c->isatty && c->detach_close && c->istate != CHAN_INPUT_CLOSED; |
1497 | if (c->rfd != -1 && (force || FD_ISSET(c->rfd, readset))) { | |
ea8c44d9 | 1498 | errno = 0; |
7368a6c8 | 1499 | len = read(c->rfd, buf, sizeof(buf)); |
bd6a1355 | 1500 | if (len < 0 && (errno == EINTR || (errno == EAGAIN && !force))) |
0fbe8c74 | 1501 | return 1; |
ea8c44d9 | 1502 | #ifndef PTY_ZEROREAD |
7368a6c8 | 1503 | if (len <= 0) { |
ea8c44d9 | 1504 | #else |
9c04d67d | 1505 | if ((!c->isatty && len <= 0) || |
1506 | (c->isatty && (len < 0 || (len == 0 && errno != 0)))) { | |
ea8c44d9 | 1507 | #endif |
d7ac5f18 | 1508 | debug2("channel %d: read<=0 rfd %d len %d", |
7368a6c8 | 1509 | c->self, c->rfd, len); |
28b9cb4d | 1510 | if (c->type != SSH_CHANNEL_OPEN) { |
d7ac5f18 | 1511 | debug2("channel %d: not open", c->self); |
719fc62f | 1512 | chan_mark_dead(c); |
0490e609 | 1513 | return -1; |
28b9cb4d | 1514 | } else if (compat13) { |
9c50edcf | 1515 | buffer_clear(&c->output); |
7368a6c8 | 1516 | c->type = SSH_CHANNEL_INPUT_DRAINING; |
d7ac5f18 | 1517 | debug2("channel %d: input draining.", c->self); |
7368a6c8 | 1518 | } else { |
1519 | chan_read_failed(c); | |
5260325f | 1520 | } |
7368a6c8 | 1521 | return -1; |
1522 | } | |
6aacefa7 | 1523 | if (c->input_filter != NULL) { |
2e73a022 | 1524 | if (c->input_filter(c, buf, len) == -1) { |
d7ac5f18 | 1525 | debug2("channel %d: filter stops", c->self); |
2e73a022 | 1526 | chan_read_failed(c); |
1527 | } | |
d20f3c9e | 1528 | } else if (c->datagram) { |
1529 | buffer_put_string(&c->input, buf, len); | |
2e73a022 | 1530 | } else { |
1531 | buffer_append(&c->input, buf, len); | |
1532 | } | |
7368a6c8 | 1533 | } |
1534 | return 1; | |
1535 | } | |
a7137f6b | 1536 | |
ebb90778 | 1537 | /* ARGSUSED */ |
396c147e | 1538 | static int |
c8e9c167 | 1539 | channel_handle_wfd(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1540 | { |
95ce5599 | 1541 | struct termios tio; |
c1c6a032 | 1542 | u_char *data = NULL, *buf; |
780a9951 | 1543 | u_int dlen; |
7368a6c8 | 1544 | int len; |
1545 | ||
1546 | /* Send buffered output data to the socket. */ | |
6fd8622b | 1547 | if (c->wfd != -1 && |
7368a6c8 | 1548 | FD_ISSET(c->wfd, writeset) && |
1549 | buffer_len(&c->output) > 0) { | |
c1c6a032 | 1550 | if (c->output_filter != NULL) { |
1551 | if ((buf = c->output_filter(c, &data, &dlen)) == NULL) { | |
1552 | debug2("channel %d: filter stops", c->self); | |
d7b37427 | 1553 | if (c->type != SSH_CHANNEL_OPEN) |
1554 | chan_mark_dead(c); | |
1555 | else | |
1556 | chan_write_failed(c); | |
1557 | return -1; | |
c1c6a032 | 1558 | } |
1559 | } else if (c->datagram) { | |
1560 | buf = data = buffer_get_string(&c->output, &dlen); | |
1561 | } else { | |
1562 | buf = data = buffer_ptr(&c->output); | |
1563 | dlen = buffer_len(&c->output); | |
1564 | } | |
1565 | ||
d20f3c9e | 1566 | if (c->datagram) { |
d20f3c9e | 1567 | /* ignore truncated writes, datagrams might get lost */ |
1568 | c->local_consumed += dlen + 4; | |
c1c6a032 | 1569 | len = write(c->wfd, buf, dlen); |
d20f3c9e | 1570 | xfree(data); |
1571 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) | |
1572 | return 1; | |
1573 | if (len <= 0) { | |
1574 | if (c->type != SSH_CHANNEL_OPEN) | |
1575 | chan_mark_dead(c); | |
1576 | else | |
1577 | chan_write_failed(c); | |
1578 | return -1; | |
1579 | } | |
1580 | return 1; | |
1581 | } | |
64c0ce80 | 1582 | #ifdef _AIX |
aff51935 | 1583 | /* XXX: Later AIX versions can't push as much data to tty */ |
7fbb4189 | 1584 | if (compat20 && c->wfd_isatty) |
1585 | dlen = MIN(dlen, 8*1024); | |
64c0ce80 | 1586 | #endif |
c1c6a032 | 1587 | |
1588 | len = write(c->wfd, buf, dlen); | |
0fbe8c74 | 1589 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
1590 | return 1; | |
7368a6c8 | 1591 | if (len <= 0) { |
28b9cb4d | 1592 | if (c->type != SSH_CHANNEL_OPEN) { |
d7ac5f18 | 1593 | debug2("channel %d: not open", c->self); |
719fc62f | 1594 | chan_mark_dead(c); |
28b9cb4d | 1595 | return -1; |
1596 | } else if (compat13) { | |
9c50edcf | 1597 | buffer_clear(&c->output); |
d7ac5f18 | 1598 | debug2("channel %d: input draining.", c->self); |
7368a6c8 | 1599 | c->type = SSH_CHANNEL_INPUT_DRAINING; |
1600 | } else { | |
1601 | chan_write_failed(c); | |
5260325f | 1602 | } |
7368a6c8 | 1603 | return -1; |
1604 | } | |
c1c6a032 | 1605 | if (compat20 && c->isatty && dlen >= 1 && buf[0] != '\r') { |
0ae4fe1d | 1606 | if (tcgetattr(c->wfd, &tio) == 0 && |
1607 | !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) { | |
1608 | /* | |
1609 | * Simulate echo to reduce the impact of | |
355724fc | 1610 | * traffic analysis. We need to match the |
95ce5599 | 1611 | * size of a SSH2_MSG_CHANNEL_DATA message |
c1c6a032 | 1612 | * (4 byte channel id + buf) |
0ae4fe1d | 1613 | */ |
95ce5599 | 1614 | packet_send_ignore(4 + len); |
0ae4fe1d | 1615 | packet_send(); |
0ae4fe1d | 1616 | } |
1617 | } | |
7368a6c8 | 1618 | buffer_consume(&c->output, len); |
7e7327a1 | 1619 | if (compat20 && len > 0) { |
1620 | c->local_consumed += len; | |
1621 | } | |
1622 | } | |
1623 | return 1; | |
1624 | } | |
a7137f6b | 1625 | |
396c147e | 1626 | static int |
c8e9c167 | 1627 | channel_handle_efd(Channel *c, fd_set *readset, fd_set *writeset) |
7e7327a1 | 1628 | { |
fa1d7d85 | 1629 | char buf[CHAN_RBUF]; |
7e7327a1 | 1630 | int len; |
1631 | ||
8ce64345 | 1632 | /** XXX handle drain efd, too */ |
7e7327a1 | 1633 | if (c->efd != -1) { |
1634 | if (c->extended_usage == CHAN_EXTENDED_WRITE && | |
1635 | FD_ISSET(c->efd, writeset) && | |
1636 | buffer_len(&c->extended) > 0) { | |
1637 | len = write(c->efd, buffer_ptr(&c->extended), | |
1638 | buffer_len(&c->extended)); | |
de273eef | 1639 | debug2("channel %d: written %d to efd %d", |
7e7327a1 | 1640 | c->self, len, c->efd); |
ee55dacf | 1641 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
1642 | return 1; | |
1643 | if (len <= 0) { | |
1644 | debug2("channel %d: closing write-efd %d", | |
1645 | c->self, c->efd); | |
489aa2e9 | 1646 | channel_close_fd(&c->efd); |
ee55dacf | 1647 | } else { |
7e7327a1 | 1648 | buffer_consume(&c->extended, len); |
1649 | c->local_consumed += len; | |
1650 | } | |
1651 | } else if (c->extended_usage == CHAN_EXTENDED_READ && | |
34640ce6 | 1652 | (c->detach_close || FD_ISSET(c->efd, readset))) { |
7e7327a1 | 1653 | len = read(c->efd, buf, sizeof(buf)); |
de273eef | 1654 | debug2("channel %d: read %d from efd %d", |
184eed6a | 1655 | c->self, len, c->efd); |
34640ce6 | 1656 | if (len < 0 && (errno == EINTR || |
1657 | (errno == EAGAIN && !c->detach_close))) | |
ee55dacf | 1658 | return 1; |
1659 | if (len <= 0) { | |
1660 | debug2("channel %d: closing read-efd %d", | |
8ce64345 | 1661 | c->self, c->efd); |
489aa2e9 | 1662 | channel_close_fd(&c->efd); |
ee55dacf | 1663 | } else { |
7e7327a1 | 1664 | buffer_append(&c->extended, buf, len); |
ee55dacf | 1665 | } |
7e7327a1 | 1666 | } |
1667 | } | |
1668 | return 1; | |
1669 | } | |
a7137f6b | 1670 | |
ebb90778 | 1671 | /* ARGSUSED */ |
396c147e | 1672 | static int |
c8e9c167 | 1673 | channel_handle_ctl(Channel *c, fd_set *readset, fd_set *writeset) |
5e96b616 | 1674 | { |
1675 | char buf[16]; | |
1676 | int len; | |
1677 | ||
1678 | /* Monitor control fd to detect if the slave client exits */ | |
1679 | if (c->ctl_fd != -1 && FD_ISSET(c->ctl_fd, readset)) { | |
1680 | len = read(c->ctl_fd, buf, sizeof(buf)); | |
1681 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) | |
1682 | return 1; | |
1683 | if (len <= 0) { | |
1684 | debug2("channel %d: ctl read<=0", c->self); | |
1685 | if (c->type != SSH_CHANNEL_OPEN) { | |
1686 | debug2("channel %d: not open", c->self); | |
1687 | chan_mark_dead(c); | |
1688 | return -1; | |
1689 | } else { | |
1690 | chan_read_failed(c); | |
1691 | chan_write_failed(c); | |
1692 | } | |
1693 | return -1; | |
1694 | } else | |
1695 | fatal("%s: unexpected data on ctl fd", __func__); | |
1696 | } | |
1697 | return 1; | |
1698 | } | |
a7137f6b | 1699 | |
5e96b616 | 1700 | static int |
ee55dacf | 1701 | channel_check_window(Channel *c) |
7e7327a1 | 1702 | { |
28b9cb4d | 1703 | if (c->type == SSH_CHANNEL_OPEN && |
1704 | !(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) && | |
d9245683 | 1705 | ((c->local_window_max - c->local_window > |
68a73f53 | 1706 | c->local_maxpacket*3) || |
1707 | c->local_window < c->local_window_max/2) && | |
7e7327a1 | 1708 | c->local_consumed > 0) { |
1709 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); | |
1710 | packet_put_int(c->remote_id); | |
1711 | packet_put_int(c->local_consumed); | |
1712 | packet_send(); | |
de273eef | 1713 | debug2("channel %d: window %d sent adjust %d", |
7e7327a1 | 1714 | c->self, c->local_window, |
1715 | c->local_consumed); | |
1716 | c->local_window += c->local_consumed; | |
1717 | c->local_consumed = 0; | |
7368a6c8 | 1718 | } |
1719 | return 1; | |
1720 | } | |
5260325f | 1721 | |
396c147e | 1722 | static void |
c8e9c167 | 1723 | channel_post_open(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1724 | { |
639cb8ab | 1725 | if (c->delayed) |
1726 | return; | |
7368a6c8 | 1727 | channel_handle_rfd(c, readset, writeset); |
1728 | channel_handle_wfd(c, readset, writeset); | |
0c0738d5 | 1729 | if (!compat20) |
639cb8ab | 1730 | return; |
7e7327a1 | 1731 | channel_handle_efd(c, readset, writeset); |
5e96b616 | 1732 | channel_handle_ctl(c, readset, writeset); |
ee55dacf | 1733 | channel_check_window(c); |
7e7327a1 | 1734 | } |
1735 | ||
ebb90778 | 1736 | /* ARGSUSED */ |
396c147e | 1737 | static void |
c8e9c167 | 1738 | channel_post_output_drain_13(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1739 | { |
1740 | int len; | |
e1feb9bf | 1741 | |
7368a6c8 | 1742 | /* Send buffered output data to the socket. */ |
1743 | if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) { | |
1744 | len = write(c->sock, buffer_ptr(&c->output), | |
1745 | buffer_len(&c->output)); | |
1746 | if (len <= 0) | |
9c50edcf | 1747 | buffer_clear(&c->output); |
7368a6c8 | 1748 | else |
1749 | buffer_consume(&c->output, len); | |
1750 | } | |
1751 | } | |
5260325f | 1752 | |
396c147e | 1753 | static void |
7e7327a1 | 1754 | channel_handler_init_20(void) |
1755 | { | |
0c0738d5 | 1756 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open; |
0b242b12 | 1757 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
7e7327a1 | 1758 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; |
fa08c86b | 1759 | channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener; |
0b242b12 | 1760 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
fa08c86b | 1761 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; |
97fb6912 | 1762 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1763 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7e7327a1 | 1764 | |
0c0738d5 | 1765 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
7e7327a1 | 1766 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; |
fa08c86b | 1767 | channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener; |
0b242b12 | 1768 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
fa08c86b | 1769 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; |
97fb6912 | 1770 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 1771 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
7e7327a1 | 1772 | } |
1773 | ||
396c147e | 1774 | static void |
7368a6c8 | 1775 | channel_handler_init_13(void) |
1776 | { | |
1777 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13; | |
1778 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_13; | |
1779 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; | |
1780 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; | |
1781 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; | |
1782 | channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining; | |
1783 | channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining; | |
97fb6912 | 1784 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1785 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7368a6c8 | 1786 | |
0c0738d5 | 1787 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
7368a6c8 | 1788 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
1789 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; | |
1790 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; | |
1791 | channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13; | |
97fb6912 | 1792 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 1793 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
7368a6c8 | 1794 | } |
5260325f | 1795 | |
396c147e | 1796 | static void |
7368a6c8 | 1797 | channel_handler_init_15(void) |
1798 | { | |
0c0738d5 | 1799 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open; |
0b242b12 | 1800 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
7368a6c8 | 1801 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
1802 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; | |
1803 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; | |
97fb6912 | 1804 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1805 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7368a6c8 | 1806 | |
1807 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; | |
1808 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; | |
1809 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; | |
0c0738d5 | 1810 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
97fb6912 | 1811 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 1812 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
7368a6c8 | 1813 | } |
1814 | ||
396c147e | 1815 | static void |
7368a6c8 | 1816 | channel_handler_init(void) |
1817 | { | |
1818 | int i; | |
e1feb9bf | 1819 | |
184eed6a | 1820 | for (i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) { |
7368a6c8 | 1821 | channel_pre[i] = NULL; |
1822 | channel_post[i] = NULL; | |
1823 | } | |
7e7327a1 | 1824 | if (compat20) |
1825 | channel_handler_init_20(); | |
1826 | else if (compat13) | |
7368a6c8 | 1827 | channel_handler_init_13(); |
1828 | else | |
1829 | channel_handler_init_15(); | |
1830 | } | |
1831 | ||
418e724c | 1832 | /* gc dead channels */ |
1833 | static void | |
1834 | channel_garbage_collect(Channel *c) | |
1835 | { | |
1836 | if (c == NULL) | |
1837 | return; | |
1838 | if (c->detach_user != NULL) { | |
8cd0437d | 1839 | if (!chan_is_dead(c, c->detach_close)) |
418e724c | 1840 | return; |
d7ac5f18 | 1841 | debug2("channel %d: gc: notify user", c->self); |
418e724c | 1842 | c->detach_user(c->self, NULL); |
1843 | /* if we still have a callback */ | |
1844 | if (c->detach_user != NULL) | |
1845 | return; | |
d7ac5f18 | 1846 | debug2("channel %d: gc: user detached", c->self); |
418e724c | 1847 | } |
1848 | if (!chan_is_dead(c, 1)) | |
1849 | return; | |
d7ac5f18 | 1850 | debug2("channel %d: garbage collecting", c->self); |
418e724c | 1851 | channel_free(c); |
1852 | } | |
1853 | ||
396c147e | 1854 | static void |
c8e9c167 | 1855 | channel_handler(chan_fn *ftab[], fd_set *readset, fd_set *writeset) |
7368a6c8 | 1856 | { |
1857 | static int did_init = 0; | |
9a995072 | 1858 | u_int i; |
7368a6c8 | 1859 | Channel *c; |
1860 | ||
1861 | if (!did_init) { | |
1862 | channel_handler_init(); | |
1863 | did_init = 1; | |
1864 | } | |
1865 | for (i = 0; i < channels_alloc; i++) { | |
719fc62f | 1866 | c = channels[i]; |
1867 | if (c == NULL) | |
5260325f | 1868 | continue; |
6fd8622b | 1869 | if (ftab[c->type] != NULL) |
1870 | (*ftab[c->type])(c, readset, writeset); | |
418e724c | 1871 | channel_garbage_collect(c); |
8efc0c15 | 1872 | } |
8efc0c15 | 1873 | } |
1874 | ||
8e7895b8 | 1875 | /* |
1876 | * Allocate/update select bitmasks and add any bits relevant to channels in | |
1877 | * select bitmasks. | |
1878 | */ | |
6ae2364d | 1879 | void |
c422989b | 1880 | channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp, |
9a995072 | 1881 | u_int *nallocp, int rekeying) |
7368a6c8 | 1882 | { |
c5d10563 | 1883 | u_int n, sz, nfdset; |
39929cdb | 1884 | |
1885 | n = MAX(*maxfdp, channel_max_fd); | |
1886 | ||
c5d10563 | 1887 | nfdset = howmany(n+1, NFDBITS); |
1888 | /* Explicitly test here, because xrealloc isn't always called */ | |
1889 | if (nfdset && SIZE_T_MAX / nfdset < sizeof(fd_mask)) | |
1890 | fatal("channel_prepare_select: max_fd (%d) is too large", n); | |
1891 | sz = nfdset * sizeof(fd_mask); | |
1892 | ||
489aa2e9 | 1893 | /* perhaps check sz < nalloc/2 and shrink? */ |
1894 | if (*readsetp == NULL || sz > *nallocp) { | |
c5d10563 | 1895 | *readsetp = xrealloc(*readsetp, nfdset, sizeof(fd_mask)); |
1896 | *writesetp = xrealloc(*writesetp, nfdset, sizeof(fd_mask)); | |
489aa2e9 | 1897 | *nallocp = sz; |
39929cdb | 1898 | } |
489aa2e9 | 1899 | *maxfdp = n; |
39929cdb | 1900 | memset(*readsetp, 0, sz); |
1901 | memset(*writesetp, 0, sz); | |
1902 | ||
c422989b | 1903 | if (!rekeying) |
1904 | channel_handler(channel_pre, *readsetp, *writesetp); | |
7368a6c8 | 1905 | } |
1906 | ||
8e7895b8 | 1907 | /* |
1908 | * After select, perform any appropriate operations for channels which have | |
1909 | * events pending. | |
1910 | */ | |
6ae2364d | 1911 | void |
c8e9c167 | 1912 | channel_after_select(fd_set *readset, fd_set *writeset) |
7368a6c8 | 1913 | { |
1914 | channel_handler(channel_post, readset, writeset); | |
1915 | } | |
1916 | ||
8e7895b8 | 1917 | |
39929cdb | 1918 | /* If there is data to send to the connection, enqueue some of it now. */ |
6ae2364d | 1919 | void |
d5bb9418 | 1920 | channel_output_poll(void) |
8efc0c15 | 1921 | { |
7368a6c8 | 1922 | Channel *c; |
9a995072 | 1923 | u_int i, len; |
5260325f | 1924 | |
1925 | for (i = 0; i < channels_alloc; i++) { | |
719fc62f | 1926 | c = channels[i]; |
1927 | if (c == NULL) | |
1928 | continue; | |
48e671d5 | 1929 | |
8e7895b8 | 1930 | /* |
1931 | * We are only interested in channels that can have buffered | |
1932 | * incoming data. | |
1933 | */ | |
48e671d5 | 1934 | if (compat13) { |
7368a6c8 | 1935 | if (c->type != SSH_CHANNEL_OPEN && |
1936 | c->type != SSH_CHANNEL_INPUT_DRAINING) | |
48e671d5 | 1937 | continue; |
1938 | } else { | |
7368a6c8 | 1939 | if (c->type != SSH_CHANNEL_OPEN) |
48e671d5 | 1940 | continue; |
48e671d5 | 1941 | } |
e78a59f5 | 1942 | if (compat20 && |
1943 | (c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) { | |
ee55dacf | 1944 | /* XXX is this true? */ |
418e724c | 1945 | debug3("channel %d: will not send data after close", c->self); |
7e7327a1 | 1946 | continue; |
1947 | } | |
5260325f | 1948 | |
1949 | /* Get the amount of buffered data for this channel. */ | |
ee55dacf | 1950 | if ((c->istate == CHAN_INPUT_OPEN || |
1951 | c->istate == CHAN_INPUT_WAIT_DRAIN) && | |
1952 | (len = buffer_len(&c->input)) > 0) { | |
d20f3c9e | 1953 | if (c->datagram) { |
1954 | if (len > 0) { | |
1955 | u_char *data; | |
1956 | u_int dlen; | |
1957 | ||
1958 | data = buffer_get_string(&c->input, | |
1959 | &dlen); | |
1960 | packet_start(SSH2_MSG_CHANNEL_DATA); | |
1961 | packet_put_int(c->remote_id); | |
1962 | packet_put_string(data, dlen); | |
1963 | packet_send(); | |
1964 | c->remote_window -= dlen + 4; | |
1965 | xfree(data); | |
1966 | } | |
1967 | continue; | |
1968 | } | |
8e7895b8 | 1969 | /* |
1970 | * Send some data for the other side over the secure | |
1971 | * connection. | |
1972 | */ | |
7e7327a1 | 1973 | if (compat20) { |
1974 | if (len > c->remote_window) | |
1975 | len = c->remote_window; | |
1976 | if (len > c->remote_maxpacket) | |
1977 | len = c->remote_maxpacket; | |
5260325f | 1978 | } else { |
7e7327a1 | 1979 | if (packet_is_interactive()) { |
1980 | if (len > 1024) | |
1981 | len = 512; | |
1982 | } else { | |
1983 | /* Keep the packets at reasonable size. */ | |
1984 | if (len > packet_get_maxsize()/2) | |
1985 | len = packet_get_maxsize()/2; | |
1986 | } | |
5260325f | 1987 | } |
7368a6c8 | 1988 | if (len > 0) { |
7e7327a1 | 1989 | packet_start(compat20 ? |
1990 | SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA); | |
7368a6c8 | 1991 | packet_put_int(c->remote_id); |
1992 | packet_put_string(buffer_ptr(&c->input), len); | |
1993 | packet_send(); | |
1994 | buffer_consume(&c->input, len); | |
1995 | c->remote_window -= len; | |
7368a6c8 | 1996 | } |
1997 | } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) { | |
5260325f | 1998 | if (compat13) |
1999 | fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3"); | |
aa3378df | 2000 | /* |
2001 | * input-buffer is empty and read-socket shutdown: | |
d2296ed7 | 2002 | * tell peer, that we will not send more data: send IEOF. |
2003 | * hack for extended data: delay EOF if EFD still in use. | |
aa3378df | 2004 | */ |
d2296ed7 | 2005 | if (CHANNEL_EFD_INPUT_ACTIVE(c)) |
4e2e5cfd | 2006 | debug2("channel %d: ibuf_empty delayed efd %d/(%d)", |
2007 | c->self, c->efd, buffer_len(&c->extended)); | |
d2296ed7 | 2008 | else |
2009 | chan_ibuf_empty(c); | |
5260325f | 2010 | } |
7e7327a1 | 2011 | /* Send extended data, i.e. stderr */ |
2012 | if (compat20 && | |
d2296ed7 | 2013 | !(c->flags & CHAN_EOF_SENT) && |
7e7327a1 | 2014 | c->remote_window > 0 && |
2015 | (len = buffer_len(&c->extended)) > 0 && | |
2016 | c->extended_usage == CHAN_EXTENDED_READ) { | |
f91d9a89 | 2017 | debug2("channel %d: rwin %u elen %u euse %d", |
ee55dacf | 2018 | c->self, c->remote_window, buffer_len(&c->extended), |
2019 | c->extended_usage); | |
7e7327a1 | 2020 | if (len > c->remote_window) |
2021 | len = c->remote_window; | |
2022 | if (len > c->remote_maxpacket) | |
2023 | len = c->remote_maxpacket; | |
2024 | packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA); | |
2025 | packet_put_int(c->remote_id); | |
2026 | packet_put_int(SSH2_EXTENDED_DATA_STDERR); | |
2027 | packet_put_string(buffer_ptr(&c->extended), len); | |
2028 | packet_send(); | |
2029 | buffer_consume(&c->extended, len); | |
2030 | c->remote_window -= len; | |
ee55dacf | 2031 | debug2("channel %d: sent ext data %d", c->self, len); |
7e7327a1 | 2032 | } |
8efc0c15 | 2033 | } |
8efc0c15 | 2034 | } |
2035 | ||
8e7895b8 | 2036 | |
2037 | /* -- protocol input */ | |
04aa9e67 | 2038 | |
2039 | /* ARGSUSED */ | |
6ae2364d | 2040 | void |
7819b5c3 | 2041 | channel_input_data(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2042 | { |
48e671d5 | 2043 | int id; |
5260325f | 2044 | char *data; |
1e3b8b07 | 2045 | u_int data_len; |
7368a6c8 | 2046 | Channel *c; |
5260325f | 2047 | |
2048 | /* Get the channel number and verify it. */ | |
48e671d5 | 2049 | id = packet_get_int(); |
7368a6c8 | 2050 | c = channel_lookup(id); |
2051 | if (c == NULL) | |
48e671d5 | 2052 | packet_disconnect("Received data for nonexistent channel %d.", id); |
5260325f | 2053 | |
2054 | /* Ignore any data for non-open channels (might happen on close) */ | |
7368a6c8 | 2055 | if (c->type != SSH_CHANNEL_OPEN && |
2056 | c->type != SSH_CHANNEL_X11_OPEN) | |
48e671d5 | 2057 | return; |
2058 | ||
5260325f | 2059 | /* Get the data. */ |
17f02f0a | 2060 | data = packet_get_string_ptr(&data_len); |
7368a6c8 | 2061 | |
7741e239 | 2062 | /* |
2063 | * Ignore data for protocol > 1.3 if output end is no longer open. | |
2064 | * For protocol 2 the sending side is reducing its window as it sends | |
2065 | * data, so we must 'fake' consumption of the data in order to ensure | |
2066 | * that window updates are sent back. Otherwise the connection might | |
2067 | * deadlock. | |
2068 | */ | |
2069 | if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN) { | |
2070 | if (compat20) { | |
2071 | c->local_window -= data_len; | |
2072 | c->local_consumed += data_len; | |
2073 | } | |
7741e239 | 2074 | return; |
2075 | } | |
2076 | ||
6aacefa7 | 2077 | if (compat20) { |
7e7327a1 | 2078 | if (data_len > c->local_maxpacket) { |
bbe88b6d | 2079 | logit("channel %d: rcvd big packet %d, maxpack %d", |
7e7327a1 | 2080 | c->self, data_len, c->local_maxpacket); |
2081 | } | |
2082 | if (data_len > c->local_window) { | |
bbe88b6d | 2083 | logit("channel %d: rcvd too much data %d, win %d", |
7e7327a1 | 2084 | c->self, data_len, c->local_window); |
7e7327a1 | 2085 | return; |
2086 | } | |
2087 | c->local_window -= data_len; | |
7e7327a1 | 2088 | } |
d20f3c9e | 2089 | if (c->datagram) |
2090 | buffer_put_string(&c->output, data, data_len); | |
2091 | else | |
2092 | buffer_append(&c->output, data, data_len); | |
17f02f0a | 2093 | packet_check_eom(); |
8efc0c15 | 2094 | } |
8e7895b8 | 2095 | |
04aa9e67 | 2096 | /* ARGSUSED */ |
6ae2364d | 2097 | void |
7819b5c3 | 2098 | channel_input_extended_data(int type, u_int32_t seq, void *ctxt) |
7e7327a1 | 2099 | { |
2100 | int id; | |
7e7327a1 | 2101 | char *data; |
a594fa74 | 2102 | u_int data_len, tcode; |
7e7327a1 | 2103 | Channel *c; |
2104 | ||
2105 | /* Get the channel number and verify it. */ | |
2106 | id = packet_get_int(); | |
2107 | c = channel_lookup(id); | |
2108 | ||
2109 | if (c == NULL) | |
2110 | packet_disconnect("Received extended_data for bad channel %d.", id); | |
2111 | if (c->type != SSH_CHANNEL_OPEN) { | |
bbe88b6d | 2112 | logit("channel %d: ext data for non open", id); |
7e7327a1 | 2113 | return; |
2114 | } | |
d2296ed7 | 2115 | if (c->flags & CHAN_EOF_RCVD) { |
2116 | if (datafellows & SSH_BUG_EXTEOF) | |
2117 | debug("channel %d: accepting ext data after eof", id); | |
2118 | else | |
2119 | packet_disconnect("Received extended_data after EOF " | |
2120 | "on channel %d.", id); | |
2121 | } | |
7e7327a1 | 2122 | tcode = packet_get_int(); |
2123 | if (c->efd == -1 || | |
2124 | c->extended_usage != CHAN_EXTENDED_WRITE || | |
2125 | tcode != SSH2_EXTENDED_DATA_STDERR) { | |
bbe88b6d | 2126 | logit("channel %d: bad ext data", c->self); |
7e7327a1 | 2127 | return; |
2128 | } | |
2129 | data = packet_get_string(&data_len); | |
95500969 | 2130 | packet_check_eom(); |
7e7327a1 | 2131 | if (data_len > c->local_window) { |
bbe88b6d | 2132 | logit("channel %d: rcvd too much extended_data %d, win %d", |
7e7327a1 | 2133 | c->self, data_len, c->local_window); |
2134 | xfree(data); | |
2135 | return; | |
2136 | } | |
de273eef | 2137 | debug2("channel %d: rcvd ext data %d", c->self, data_len); |
7e7327a1 | 2138 | c->local_window -= data_len; |
2139 | buffer_append(&c->extended, data, data_len); | |
2140 | xfree(data); | |
2141 | } | |
2142 | ||
04aa9e67 | 2143 | /* ARGSUSED */ |
6ae2364d | 2144 | void |
7819b5c3 | 2145 | channel_input_ieof(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 2146 | { |
2147 | int id; | |
2148 | Channel *c; | |
2149 | ||
7368a6c8 | 2150 | id = packet_get_int(); |
95500969 | 2151 | packet_check_eom(); |
7368a6c8 | 2152 | c = channel_lookup(id); |
2153 | if (c == NULL) | |
2154 | packet_disconnect("Received ieof for nonexistent channel %d.", id); | |
2155 | chan_rcvd_ieof(c); | |
a5f82435 | 2156 | |
2157 | /* XXX force input close */ | |
8341f420 | 2158 | if (c->force_drain && c->istate == CHAN_INPUT_OPEN) { |
a5f82435 | 2159 | debug("channel %d: FORCE input drain", c->self); |
2160 | c->istate = CHAN_INPUT_WAIT_DRAIN; | |
32e7d71f | 2161 | if (buffer_len(&c->input) == 0) |
2162 | chan_ibuf_empty(c); | |
a5f82435 | 2163 | } |
2164 | ||
7368a6c8 | 2165 | } |
8efc0c15 | 2166 | |
04aa9e67 | 2167 | /* ARGSUSED */ |
6ae2364d | 2168 | void |
7819b5c3 | 2169 | channel_input_close(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2170 | { |
7368a6c8 | 2171 | int id; |
2172 | Channel *c; | |
5260325f | 2173 | |
7368a6c8 | 2174 | id = packet_get_int(); |
95500969 | 2175 | packet_check_eom(); |
7368a6c8 | 2176 | c = channel_lookup(id); |
2177 | if (c == NULL) | |
2178 | packet_disconnect("Received close for nonexistent channel %d.", id); | |
aa3378df | 2179 | |
2180 | /* | |
2181 | * Send a confirmation that we have closed the channel and no more | |
2182 | * data is coming for it. | |
2183 | */ | |
5260325f | 2184 | packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION); |
7368a6c8 | 2185 | packet_put_int(c->remote_id); |
5260325f | 2186 | packet_send(); |
2187 | ||
aa3378df | 2188 | /* |
2189 | * If the channel is in closed state, we have sent a close request, | |
2190 | * and the other side will eventually respond with a confirmation. | |
2191 | * Thus, we cannot free the channel here, because then there would be | |
2192 | * no-one to receive the confirmation. The channel gets freed when | |
2193 | * the confirmation arrives. | |
2194 | */ | |
7368a6c8 | 2195 | if (c->type != SSH_CHANNEL_CLOSED) { |
aa3378df | 2196 | /* |
2197 | * Not a closed channel - mark it as draining, which will | |
2198 | * cause it to be freed later. | |
2199 | */ | |
9c50edcf | 2200 | buffer_clear(&c->input); |
7368a6c8 | 2201 | c->type = SSH_CHANNEL_OUTPUT_DRAINING; |
5260325f | 2202 | } |
8efc0c15 | 2203 | } |
2204 | ||
7368a6c8 | 2205 | /* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */ |
04aa9e67 | 2206 | /* ARGSUSED */ |
6ae2364d | 2207 | void |
7819b5c3 | 2208 | channel_input_oclose(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2209 | { |
7368a6c8 | 2210 | int id = packet_get_int(); |
2211 | Channel *c = channel_lookup(id); | |
a8a21a53 | 2212 | |
95500969 | 2213 | packet_check_eom(); |
7368a6c8 | 2214 | if (c == NULL) |
2215 | packet_disconnect("Received oclose for nonexistent channel %d.", id); | |
2216 | chan_rcvd_oclose(c); | |
8efc0c15 | 2217 | } |
2218 | ||
04aa9e67 | 2219 | /* ARGSUSED */ |
6ae2364d | 2220 | void |
7819b5c3 | 2221 | channel_input_close_confirmation(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 2222 | { |
2223 | int id = packet_get_int(); | |
2224 | Channel *c = channel_lookup(id); | |
2225 | ||
95500969 | 2226 | packet_check_eom(); |
7368a6c8 | 2227 | if (c == NULL) |
2228 | packet_disconnect("Received close confirmation for " | |
2229 | "out-of-range channel %d.", id); | |
2230 | if (c->type != SSH_CHANNEL_CLOSED) | |
2231 | packet_disconnect("Received close confirmation for " | |
2232 | "non-closed channel %d (type %d).", id, c->type); | |
719fc62f | 2233 | channel_free(c); |
7368a6c8 | 2234 | } |
8efc0c15 | 2235 | |
04aa9e67 | 2236 | /* ARGSUSED */ |
6ae2364d | 2237 | void |
7819b5c3 | 2238 | channel_input_open_confirmation(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2239 | { |
7368a6c8 | 2240 | int id, remote_id; |
2241 | Channel *c; | |
5260325f | 2242 | |
7368a6c8 | 2243 | id = packet_get_int(); |
2244 | c = channel_lookup(id); | |
5260325f | 2245 | |
7368a6c8 | 2246 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) |
2247 | packet_disconnect("Received open confirmation for " | |
2248 | "non-opening channel %d.", id); | |
2249 | remote_id = packet_get_int(); | |
aa3378df | 2250 | /* Record the remote channel number and mark that the channel is now open. */ |
7368a6c8 | 2251 | c->remote_id = remote_id; |
2252 | c->type = SSH_CHANNEL_OPEN; | |
7e7327a1 | 2253 | |
2254 | if (compat20) { | |
2255 | c->remote_window = packet_get_int(); | |
2256 | c->remote_maxpacket = packet_get_int(); | |
3593bdc0 | 2257 | if (c->open_confirm) { |
de273eef | 2258 | debug2("callback start"); |
3593bdc0 | 2259 | c->open_confirm(c->self, c->open_confirm_ctx); |
de273eef | 2260 | debug2("callback done"); |
7e7327a1 | 2261 | } |
d7ac5f18 | 2262 | debug2("channel %d: open confirm rwindow %u rmax %u", c->self, |
7e7327a1 | 2263 | c->remote_window, c->remote_maxpacket); |
2264 | } | |
95500969 | 2265 | packet_check_eom(); |
8efc0c15 | 2266 | } |
2267 | ||
396c147e | 2268 | static char * |
d18e0850 | 2269 | reason2txt(int reason) |
2270 | { | |
6aacefa7 | 2271 | switch (reason) { |
d18e0850 | 2272 | case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED: |
2273 | return "administratively prohibited"; | |
2274 | case SSH2_OPEN_CONNECT_FAILED: | |
2275 | return "connect failed"; | |
2276 | case SSH2_OPEN_UNKNOWN_CHANNEL_TYPE: | |
2277 | return "unknown channel type"; | |
2278 | case SSH2_OPEN_RESOURCE_SHORTAGE: | |
2279 | return "resource shortage"; | |
2280 | } | |
7e8c18e9 | 2281 | return "unknown reason"; |
d18e0850 | 2282 | } |
2283 | ||
04aa9e67 | 2284 | /* ARGSUSED */ |
6ae2364d | 2285 | void |
7819b5c3 | 2286 | channel_input_open_failure(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2287 | { |
02a024dd | 2288 | int id, reason; |
2289 | char *msg = NULL, *lang = NULL; | |
7368a6c8 | 2290 | Channel *c; |
5260325f | 2291 | |
7368a6c8 | 2292 | id = packet_get_int(); |
2293 | c = channel_lookup(id); | |
2294 | ||
2295 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) | |
2296 | packet_disconnect("Received open failure for " | |
2297 | "non-opening channel %d.", id); | |
7e7327a1 | 2298 | if (compat20) { |
02a024dd | 2299 | reason = packet_get_int(); |
fbe90f7b | 2300 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { |
02a024dd | 2301 | msg = packet_get_string(NULL); |
2302 | lang = packet_get_string(NULL); | |
2303 | } | |
bbe88b6d | 2304 | logit("channel %d: open failed: %s%s%s", id, |
d18e0850 | 2305 | reason2txt(reason), msg ? ": ": "", msg ? msg : ""); |
02a024dd | 2306 | if (msg != NULL) |
2307 | xfree(msg); | |
2308 | if (lang != NULL) | |
2309 | xfree(lang); | |
7e7327a1 | 2310 | } |
95500969 | 2311 | packet_check_eom(); |
5260325f | 2312 | /* Free the channel. This will also close the socket. */ |
719fc62f | 2313 | channel_free(c); |
8efc0c15 | 2314 | } |
2315 | ||
04aa9e67 | 2316 | /* ARGSUSED */ |
8e7895b8 | 2317 | void |
7819b5c3 | 2318 | channel_input_window_adjust(int type, u_int32_t seq, void *ctxt) |
8e7895b8 | 2319 | { |
2320 | Channel *c; | |
f91d9a89 | 2321 | int id; |
2322 | u_int adjust; | |
3ffc6336 | 2323 | |
8e7895b8 | 2324 | if (!compat20) |
2325 | return; | |
8efc0c15 | 2326 | |
8e7895b8 | 2327 | /* Get the channel number and verify it. */ |
2328 | id = packet_get_int(); | |
2329 | c = channel_lookup(id); | |
2330 | ||
b872f7f0 | 2331 | if (c == NULL) { |
2332 | logit("Received window adjust for non-open channel %d.", id); | |
8e7895b8 | 2333 | return; |
2334 | } | |
2335 | adjust = packet_get_int(); | |
95500969 | 2336 | packet_check_eom(); |
f91d9a89 | 2337 | debug2("channel %d: rcvd adjust %u", id, adjust); |
8e7895b8 | 2338 | c->remote_window += adjust; |
2339 | } | |
2340 | ||
04aa9e67 | 2341 | /* ARGSUSED */ |
8e7895b8 | 2342 | void |
7819b5c3 | 2343 | channel_input_port_open(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2344 | { |
8e7895b8 | 2345 | Channel *c = NULL; |
2346 | u_short host_port; | |
2347 | char *host, *originator_string; | |
e07e21ad | 2348 | int remote_id; |
5260325f | 2349 | |
8e7895b8 | 2350 | remote_id = packet_get_int(); |
2351 | host = packet_get_string(NULL); | |
2352 | host_port = packet_get_int(); | |
2353 | ||
2354 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) { | |
2355 | originator_string = packet_get_string(NULL); | |
2356 | } else { | |
2357 | originator_string = xstrdup("unknown (remote did not supply name)"); | |
2358 | } | |
95500969 | 2359 | packet_check_eom(); |
e07e21ad | 2360 | c = channel_connect_to(host, host_port, |
2361 | "connected socket", originator_string); | |
0d942eff | 2362 | xfree(originator_string); |
e07e21ad | 2363 | xfree(host); |
8e7895b8 | 2364 | if (c == NULL) { |
2365 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
2366 | packet_put_int(remote_id); | |
2367 | packet_send(); | |
e07e21ad | 2368 | } else |
2369 | c->remote_id = remote_id; | |
8efc0c15 | 2370 | } |
2371 | ||
3593bdc0 | 2372 | /* ARGSUSED */ |
2373 | void | |
2374 | channel_input_status_confirm(int type, u_int32_t seq, void *ctxt) | |
2375 | { | |
2376 | Channel *c; | |
2377 | struct channel_confirm *cc; | |
2378 | int remote_id; | |
2379 | ||
2380 | /* Reset keepalive timeout */ | |
2381 | keep_alive_timeouts = 0; | |
2382 | ||
2383 | remote_id = packet_get_int(); | |
2384 | packet_check_eom(); | |
2385 | ||
2386 | debug2("channel_input_confirm: type %d id %d", type, remote_id); | |
2387 | ||
2388 | if ((c = channel_lookup(remote_id)) == NULL) { | |
2389 | logit("channel_input_success_failure: %d: unknown", remote_id); | |
2390 | return; | |
2391 | } | |
2392 | ; | |
2393 | if ((cc = TAILQ_FIRST(&c->status_confirms)) == NULL) | |
2394 | return; | |
2395 | cc->cb(type, c, cc->ctx); | |
2396 | TAILQ_REMOVE(&c->status_confirms, cc, entry); | |
2397 | bzero(cc, sizeof(*cc)); | |
2398 | xfree(cc); | |
2399 | } | |
8e7895b8 | 2400 | |
2401 | /* -- tcp forwarding */ | |
2402 | ||
5e4a7219 | 2403 | void |
2404 | channel_set_af(int af) | |
2405 | { | |
2406 | IPv4or6 = af; | |
2407 | } | |
2408 | ||
5641aefa | 2409 | static int |
2410 | channel_setup_fwd_listener(int type, const char *listen_addr, u_short listen_port, | |
2411 | const char *host_to_connect, u_short port_to_connect, int gateway_ports) | |
8efc0c15 | 2412 | { |
719fc62f | 2413 | Channel *c; |
442aee3a | 2414 | int sock, r, success = 0, wildcard = 0, is_client; |
48e671d5 | 2415 | struct addrinfo hints, *ai, *aitop; |
3867aa0a | 2416 | const char *host, *addr; |
5641aefa | 2417 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
5260325f | 2418 | |
5641aefa | 2419 | host = (type == SSH_CHANNEL_RPORT_LISTENER) ? |
2420 | listen_addr : host_to_connect; | |
3867aa0a | 2421 | is_client = (type == SSH_CHANNEL_PORT_LISTENER); |
02a024dd | 2422 | |
5641aefa | 2423 | if (host == NULL) { |
2424 | error("No forward host name."); | |
38946c65 | 2425 | return 0; |
fa08c86b | 2426 | } |
719fc62f | 2427 | if (strlen(host) > SSH_CHANNEL_PATH_LEN - 1) { |
02a024dd | 2428 | error("Forward host name too long."); |
38946c65 | 2429 | return 0; |
02a024dd | 2430 | } |
5260325f | 2431 | |
3867aa0a | 2432 | /* |
2433 | * Determine whether or not a port forward listens to loopback, | |
f8cc7664 | 2434 | * specified address or wildcard. On the client, a specified bind |
2435 | * address will always override gateway_ports. On the server, a | |
2436 | * gateway_ports of 1 (``yes'') will override the client's | |
2437 | * specification and force a wildcard bind, whereas a value of 2 | |
2438 | * (``clientspecified'') will bind to whatever address the client | |
3867aa0a | 2439 | * asked for. |
2440 | * | |
2441 | * Special-case listen_addrs are: | |
2442 | * | |
2443 | * "0.0.0.0" -> wildcard v4/v6 if SSH_OLD_FORWARD_ADDR | |
2444 | * "" (empty string), "*" -> wildcard v4/v6 | |
2445 | * "localhost" -> loopback v4/v6 | |
2446 | */ | |
2447 | addr = NULL; | |
2448 | if (listen_addr == NULL) { | |
2449 | /* No address specified: default to gateway_ports setting */ | |
2450 | if (gateway_ports) | |
2451 | wildcard = 1; | |
2452 | } else if (gateway_ports || is_client) { | |
2453 | if (((datafellows & SSH_OLD_FORWARD_ADDR) && | |
bc4cc956 | 2454 | strcmp(listen_addr, "0.0.0.0") == 0 && is_client == 0) || |
3867aa0a | 2455 | *listen_addr == '\0' || strcmp(listen_addr, "*") == 0 || |
2456 | (!is_client && gateway_ports == 1)) | |
2457 | wildcard = 1; | |
2458 | else if (strcmp(listen_addr, "localhost") != 0) | |
2459 | addr = listen_addr; | |
2460 | } | |
2461 | ||
2462 | debug3("channel_setup_fwd_listener: type %d wildcard %d addr %s", | |
2463 | type, wildcard, (addr == NULL) ? "NULL" : addr); | |
2464 | ||
aa3378df | 2465 | /* |
48e671d5 | 2466 | * getaddrinfo returns a loopback address if the hostname is |
2467 | * set to NULL and hints.ai_flags is not AI_PASSIVE | |
aa3378df | 2468 | */ |
48e671d5 | 2469 | memset(&hints, 0, sizeof(hints)); |
2470 | hints.ai_family = IPv4or6; | |
3867aa0a | 2471 | hints.ai_flags = wildcard ? AI_PASSIVE : 0; |
48e671d5 | 2472 | hints.ai_socktype = SOCK_STREAM; |
fa08c86b | 2473 | snprintf(strport, sizeof strport, "%d", listen_port); |
3867aa0a | 2474 | if ((r = getaddrinfo(addr, strport, &hints, &aitop)) != 0) { |
2475 | if (addr == NULL) { | |
2476 | /* This really shouldn't happen */ | |
2477 | packet_disconnect("getaddrinfo: fatal error: %s", | |
bb4626fe | 2478 | ssh_gai_strerror(r)); |
3867aa0a | 2479 | } else { |
38946c65 | 2480 | error("channel_setup_fwd_listener: " |
bb4626fe | 2481 | "getaddrinfo(%.64s): %s", addr, |
2482 | ssh_gai_strerror(r)); | |
3867aa0a | 2483 | } |
38946c65 | 2484 | return 0; |
3867aa0a | 2485 | } |
48e671d5 | 2486 | |
48e671d5 | 2487 | for (ai = aitop; ai; ai = ai->ai_next) { |
2488 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
2489 | continue; | |
2490 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), | |
2491 | strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { | |
5641aefa | 2492 | error("channel_setup_fwd_listener: getnameinfo failed"); |
48e671d5 | 2493 | continue; |
2494 | } | |
2495 | /* Create a port to listen for the host. */ | |
3e131a6d | 2496 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
48e671d5 | 2497 | if (sock < 0) { |
2498 | /* this is no error since kernel may not support ipv6 */ | |
2499 | verbose("socket: %.100s", strerror(errno)); | |
2500 | continue; | |
2501 | } | |
442aee3a | 2502 | |
2503 | channel_set_reuseaddr(sock); | |
facfd613 | 2504 | |
48e671d5 | 2505 | debug("Local forwarding listening on %s port %s.", ntop, strport); |
2506 | ||
2507 | /* Bind the socket to the address. */ | |
2508 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { | |
2509 | /* address can be in use ipv6 address is already bound */ | |
16218745 | 2510 | if (!ai->ai_next) |
2511 | error("bind: %.100s", strerror(errno)); | |
2512 | else | |
2513 | verbose("bind: %.100s", strerror(errno)); | |
2b87da3b | 2514 | |
48e671d5 | 2515 | close(sock); |
2516 | continue; | |
2517 | } | |
2518 | /* Start listening for connections on the socket. */ | |
fce39749 | 2519 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { |
48e671d5 | 2520 | error("listen: %.100s", strerror(errno)); |
2521 | close(sock); | |
2522 | continue; | |
2523 | } | |
2524 | /* Allocate a channel number for the socket. */ | |
8e7895b8 | 2525 | c = channel_new("port listener", type, sock, sock, -1, |
0b242b12 | 2526 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, |
0d942eff | 2527 | 0, "port listener", 1); |
719fc62f | 2528 | strlcpy(c->path, host, sizeof(c->path)); |
2529 | c->host_port = port_to_connect; | |
2530 | c->listening_port = listen_port; | |
48e671d5 | 2531 | success = 1; |
2532 | } | |
2533 | if (success == 0) | |
5641aefa | 2534 | error("channel_setup_fwd_listener: cannot listen to port: %d", |
02a024dd | 2535 | listen_port); |
48e671d5 | 2536 | freeaddrinfo(aitop); |
02a024dd | 2537 | return success; |
5260325f | 2538 | } |
8efc0c15 | 2539 | |
d740ec16 | 2540 | int |
2541 | channel_cancel_rport_listener(const char *host, u_short port) | |
2542 | { | |
9a995072 | 2543 | u_int i; |
2544 | int found = 0; | |
d740ec16 | 2545 | |
f8cc7664 | 2546 | for (i = 0; i < channels_alloc; i++) { |
d740ec16 | 2547 | Channel *c = channels[i]; |
2548 | ||
2549 | if (c != NULL && c->type == SSH_CHANNEL_RPORT_LISTENER && | |
2550 | strncmp(c->path, host, sizeof(c->path)) == 0 && | |
f2107e97 | 2551 | c->listening_port == port) { |
2912cbd6 | 2552 | debug2("%s: close channel %d", __func__, i); |
d740ec16 | 2553 | channel_free(c); |
2554 | found = 1; | |
2555 | } | |
2556 | } | |
2557 | ||
2558 | return (found); | |
2559 | } | |
2560 | ||
5641aefa | 2561 | /* protocol local port fwd, used by ssh (and sshd in v1) */ |
2562 | int | |
3867aa0a | 2563 | channel_setup_local_fwd_listener(const char *listen_host, u_short listen_port, |
5641aefa | 2564 | const char *host_to_connect, u_short port_to_connect, int gateway_ports) |
2565 | { | |
2566 | return channel_setup_fwd_listener(SSH_CHANNEL_PORT_LISTENER, | |
3867aa0a | 2567 | listen_host, listen_port, host_to_connect, port_to_connect, |
2568 | gateway_ports); | |
5641aefa | 2569 | } |
2570 | ||
2571 | /* protocol v2 remote port fwd, used by sshd */ | |
2572 | int | |
2573 | channel_setup_remote_fwd_listener(const char *listen_address, | |
2574 | u_short listen_port, int gateway_ports) | |
2575 | { | |
2576 | return channel_setup_fwd_listener(SSH_CHANNEL_RPORT_LISTENER, | |
2577 | listen_address, listen_port, NULL, 0, gateway_ports); | |
2578 | } | |
2579 | ||
aa3378df | 2580 | /* |
2581 | * Initiate forwarding of connections to port "port" on remote host through | |
2582 | * the secure channel to host:port from local side. | |
2583 | */ | |
8efc0c15 | 2584 | |
42ea6f5e | 2585 | int |
3867aa0a | 2586 | channel_request_remote_forwarding(const char *listen_host, u_short listen_port, |
fa08c86b | 2587 | const char *host_to_connect, u_short port_to_connect) |
8efc0c15 | 2588 | { |
54a5250f | 2589 | int type, success = 0; |
fa08c86b | 2590 | |
5260325f | 2591 | /* Record locally that connection to this host/port is permitted. */ |
2592 | if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
2593 | fatal("channel_request_remote_forwarding: too many forwards"); | |
2594 | ||
5260325f | 2595 | /* Send the forward request to the remote side. */ |
7e7327a1 | 2596 | if (compat20) { |
3867aa0a | 2597 | const char *address_to_bind; |
04efe9b0 | 2598 | if (listen_host == NULL) { |
2599 | if (datafellows & SSH_BUG_RFWD_ADDR) | |
2600 | address_to_bind = "127.0.0.1"; | |
2601 | else | |
2602 | address_to_bind = "localhost"; | |
2603 | } else if (*listen_host == '\0' || | |
2604 | strcmp(listen_host, "*") == 0) { | |
2605 | if (datafellows & SSH_BUG_RFWD_ADDR) | |
2606 | address_to_bind = "0.0.0.0"; | |
2607 | else | |
2608 | address_to_bind = ""; | |
2609 | } else | |
3867aa0a | 2610 | address_to_bind = listen_host; |
2611 | ||
7e7327a1 | 2612 | packet_start(SSH2_MSG_GLOBAL_REQUEST); |
2613 | packet_put_cstring("tcpip-forward"); | |
e0ae8728 | 2614 | packet_put_char(1); /* boolean: want reply */ |
7e7327a1 | 2615 | packet_put_cstring(address_to_bind); |
2616 | packet_put_int(listen_port); | |
fa08c86b | 2617 | packet_send(); |
2618 | packet_write_wait(); | |
2619 | /* Assume that server accepts the request */ | |
2620 | success = 1; | |
7e7327a1 | 2621 | } else { |
2622 | packet_start(SSH_CMSG_PORT_FORWARD_REQUEST); | |
7e7327a1 | 2623 | packet_put_int(listen_port); |
d6f24e45 | 2624 | packet_put_cstring(host_to_connect); |
2625 | packet_put_int(port_to_connect); | |
7e7327a1 | 2626 | packet_send(); |
2627 | packet_write_wait(); | |
fa08c86b | 2628 | |
2629 | /* Wait for response from the remote side. */ | |
54a5250f | 2630 | type = packet_read(); |
fa08c86b | 2631 | switch (type) { |
2632 | case SSH_SMSG_SUCCESS: | |
2633 | success = 1; | |
2634 | break; | |
2635 | case SSH_SMSG_FAILURE: | |
fa08c86b | 2636 | break; |
2637 | default: | |
2638 | /* Unknown packet */ | |
2639 | packet_disconnect("Protocol error for port forward request:" | |
2640 | "received packet type %d.", type); | |
2641 | } | |
2642 | } | |
2643 | if (success) { | |
2644 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host_to_connect); | |
2645 | permitted_opens[num_permitted_opens].port_to_connect = port_to_connect; | |
2646 | permitted_opens[num_permitted_opens].listen_port = listen_port; | |
2647 | num_permitted_opens++; | |
7e7327a1 | 2648 | } |
42ea6f5e | 2649 | return (success ? 0 : -1); |
8efc0c15 | 2650 | } |
2651 | ||
d740ec16 | 2652 | /* |
f2107e97 | 2653 | * Request cancellation of remote forwarding of connection host:port from |
d740ec16 | 2654 | * local side. |
2655 | */ | |
d740ec16 | 2656 | void |
3867aa0a | 2657 | channel_request_rforward_cancel(const char *host, u_short port) |
d740ec16 | 2658 | { |
2659 | int i; | |
d740ec16 | 2660 | |
2661 | if (!compat20) | |
2662 | return; | |
2663 | ||
2664 | for (i = 0; i < num_permitted_opens; i++) { | |
f2107e97 | 2665 | if (permitted_opens[i].host_to_connect != NULL && |
d740ec16 | 2666 | permitted_opens[i].listen_port == port) |
2667 | break; | |
2668 | } | |
2669 | if (i >= num_permitted_opens) { | |
2670 | debug("%s: requested forward not found", __func__); | |
2671 | return; | |
2672 | } | |
2673 | packet_start(SSH2_MSG_GLOBAL_REQUEST); | |
2674 | packet_put_cstring("cancel-tcpip-forward"); | |
2675 | packet_put_char(0); | |
3867aa0a | 2676 | packet_put_cstring(host == NULL ? "" : host); |
d740ec16 | 2677 | packet_put_int(port); |
2678 | packet_send(); | |
2679 | ||
2680 | permitted_opens[i].listen_port = 0; | |
2681 | permitted_opens[i].port_to_connect = 0; | |
8c4bd764 | 2682 | xfree(permitted_opens[i].host_to_connect); |
d740ec16 | 2683 | permitted_opens[i].host_to_connect = NULL; |
2684 | } | |
2685 | ||
aa3378df | 2686 | /* |
2687 | * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates | |
2688 | * listening for the port, and sends back a success reply (or disconnect | |
42ea6f5e | 2689 | * message if there was an error). |
aa3378df | 2690 | */ |
42ea6f5e | 2691 | int |
1d1ffb87 | 2692 | channel_input_port_forward_request(int is_root, int gateway_ports) |
8efc0c15 | 2693 | { |
57112b5a | 2694 | u_short port, host_port; |
42ea6f5e | 2695 | int success = 0; |
5260325f | 2696 | char *hostname; |
2697 | ||
2698 | /* Get arguments from the packet. */ | |
2699 | port = packet_get_int(); | |
2700 | hostname = packet_get_string(NULL); | |
2701 | host_port = packet_get_int(); | |
2702 | ||
3c62e7eb | 2703 | #ifndef HAVE_CYGWIN |
aa3378df | 2704 | /* |
2705 | * Check that an unprivileged user is not trying to forward a | |
2706 | * privileged port. | |
2707 | */ | |
5260325f | 2708 | if (port < IPPORT_RESERVED && !is_root) |
8e7c9afc | 2709 | packet_disconnect( |
2710 | "Requested forwarding of port %d but user is not root.", | |
2711 | port); | |
2712 | if (host_port == 0) | |
2713 | packet_disconnect("Dynamic forwarding denied."); | |
3c62e7eb | 2714 | #endif |
8e7c9afc | 2715 | |
fa08c86b | 2716 | /* Initiate forwarding */ |
42ea6f5e | 2717 | success = channel_setup_local_fwd_listener(NULL, port, hostname, |
3867aa0a | 2718 | host_port, gateway_ports); |
5260325f | 2719 | |
2720 | /* Free the argument string. */ | |
2721 | xfree(hostname); | |
42ea6f5e | 2722 | |
2723 | return (success ? 0 : -1); | |
8efc0c15 | 2724 | } |
2725 | ||
01794848 | 2726 | /* |
2727 | * Permits opening to any host/port if permitted_opens[] is empty. This is | |
2728 | * usually called by the server, because the user could connect to any port | |
2729 | * anyway, and the server has no way to know but to trust the client anyway. | |
2730 | */ | |
2731 | void | |
d5bb9418 | 2732 | channel_permit_all_opens(void) |
01794848 | 2733 | { |
2734 | if (num_permitted_opens == 0) | |
2735 | all_opens_permitted = 1; | |
2736 | } | |
2737 | ||
cd332296 | 2738 | void |
01794848 | 2739 | channel_add_permitted_opens(char *host, int port) |
2740 | { | |
2741 | if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
42ea6f5e | 2742 | fatal("channel_add_permitted_opens: too many forwards"); |
01794848 | 2743 | debug("allow port forwarding to host %s port %d", host, port); |
2744 | ||
2745 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host); | |
2746 | permitted_opens[num_permitted_opens].port_to_connect = port; | |
2747 | num_permitted_opens++; | |
2748 | ||
2749 | all_opens_permitted = 0; | |
2750 | } | |
2751 | ||
ea46e550 | 2752 | int |
2fefbadf | 2753 | channel_add_adm_permitted_opens(char *host, int port) |
2754 | { | |
2755 | if (num_adm_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
2756 | fatal("channel_add_adm_permitted_opens: too many forwards"); | |
ea46e550 | 2757 | debug("config allows port forwarding to host %s port %d", host, port); |
2fefbadf | 2758 | |
2759 | permitted_adm_opens[num_adm_permitted_opens].host_to_connect | |
2760 | = xstrdup(host); | |
2761 | permitted_adm_opens[num_adm_permitted_opens].port_to_connect = port; | |
ea46e550 | 2762 | return ++num_adm_permitted_opens; |
2fefbadf | 2763 | } |
2764 | ||
cd332296 | 2765 | void |
01794848 | 2766 | channel_clear_permitted_opens(void) |
2767 | { | |
2768 | int i; | |
2769 | ||
2770 | for (i = 0; i < num_permitted_opens; i++) | |
d740ec16 | 2771 | if (permitted_opens[i].host_to_connect != NULL) |
2772 | xfree(permitted_opens[i].host_to_connect); | |
01794848 | 2773 | num_permitted_opens = 0; |
2fefbadf | 2774 | } |
2775 | ||
2776 | void | |
2777 | channel_clear_adm_permitted_opens(void) | |
2778 | { | |
2779 | int i; | |
01794848 | 2780 | |
2fefbadf | 2781 | for (i = 0; i < num_adm_permitted_opens; i++) |
2782 | if (permitted_adm_opens[i].host_to_connect != NULL) | |
2783 | xfree(permitted_adm_opens[i].host_to_connect); | |
2784 | num_adm_permitted_opens = 0; | |
01794848 | 2785 | } |
2786 | ||
1760c982 | 2787 | void |
2788 | channel_print_adm_permitted_opens(void) | |
2789 | { | |
2790 | static int i; | |
2791 | ||
2792 | for (i = 0; i < num_adm_permitted_opens; i++) | |
2793 | if (permitted_adm_opens[i].host_to_connect != NULL) | |
2794 | printf(" %s:%d", permitted_adm_opens[i].host_to_connect, | |
2795 | permitted_adm_opens[i].port_to_connect); | |
2796 | } | |
2797 | ||
e07e21ad | 2798 | /* Try to start non-blocking connect to next host in cctx list */ |
396c147e | 2799 | static int |
e07e21ad | 2800 | connect_next(struct channel_connect *cctx) |
8efc0c15 | 2801 | { |
e07e21ad | 2802 | int sock, saved_errno; |
48e671d5 | 2803 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
48e671d5 | 2804 | |
e07e21ad | 2805 | for (; cctx->ai; cctx->ai = cctx->ai->ai_next) { |
2806 | if (cctx->ai->ai_family != AF_INET && | |
2807 | cctx->ai->ai_family != AF_INET6) | |
48e671d5 | 2808 | continue; |
e07e21ad | 2809 | if (getnameinfo(cctx->ai->ai_addr, cctx->ai->ai_addrlen, |
2810 | ntop, sizeof(ntop), strport, sizeof(strport), | |
2811 | NI_NUMERICHOST|NI_NUMERICSERV) != 0) { | |
2812 | error("connect_next: getnameinfo failed"); | |
48e671d5 | 2813 | continue; |
5260325f | 2814 | } |
e07e21ad | 2815 | if ((sock = socket(cctx->ai->ai_family, cctx->ai->ai_socktype, |
2816 | cctx->ai->ai_protocol)) == -1) { | |
2817 | if (cctx->ai->ai_next == NULL) | |
4940c411 | 2818 | error("socket: %.100s", strerror(errno)); |
2819 | else | |
2820 | verbose("socket: %.100s", strerror(errno)); | |
48e671d5 | 2821 | continue; |
5260325f | 2822 | } |
170694d7 | 2823 | if (set_nonblock(sock) == -1) |
2824 | fatal("%s: set_nonblock(%d)", __func__, sock); | |
e07e21ad | 2825 | if (connect(sock, cctx->ai->ai_addr, |
2826 | cctx->ai->ai_addrlen) == -1 && errno != EINPROGRESS) { | |
2827 | debug("connect_next: host %.100s ([%.100s]:%s): " | |
2828 | "%.100s", cctx->host, ntop, strport, | |
48e671d5 | 2829 | strerror(errno)); |
e07e21ad | 2830 | saved_errno = errno; |
48e671d5 | 2831 | close(sock); |
e07e21ad | 2832 | errno = saved_errno; |
2b87da3b | 2833 | continue; /* fail -- try next */ |
48e671d5 | 2834 | } |
e07e21ad | 2835 | debug("connect_next: host %.100s ([%.100s]:%s) " |
2836 | "in progress, fd=%d", cctx->host, ntop, strport, sock); | |
2837 | cctx->ai = cctx->ai->ai_next; | |
2838 | set_nodelay(sock); | |
2839 | return sock; | |
2840 | } | |
2841 | return -1; | |
2842 | } | |
2843 | ||
2844 | static void | |
2845 | channel_connect_ctx_free(struct channel_connect *cctx) | |
2846 | { | |
2847 | xfree(cctx->host); | |
2848 | if (cctx->aitop) | |
2849 | freeaddrinfo(cctx->aitop); | |
2850 | bzero(cctx, sizeof(*cctx)); | |
2851 | cctx->host = NULL; | |
2852 | cctx->ai = cctx->aitop = NULL; | |
2853 | } | |
2854 | ||
2855 | /* Return CONNECTING channel to remote host, port */ | |
2856 | static Channel * | |
2857 | connect_to(const char *host, u_short port, char *ctype, char *rname) | |
2858 | { | |
2859 | struct addrinfo hints; | |
2860 | int gaierr; | |
2861 | int sock = -1; | |
2862 | char strport[NI_MAXSERV]; | |
2863 | struct channel_connect cctx; | |
2864 | Channel *c; | |
5260325f | 2865 | |
e07e21ad | 2866 | memset(&hints, 0, sizeof(hints)); |
2867 | hints.ai_family = IPv4or6; | |
2868 | hints.ai_socktype = SOCK_STREAM; | |
2869 | snprintf(strport, sizeof strport, "%d", port); | |
2870 | if ((gaierr = getaddrinfo(host, strport, &hints, &cctx.aitop)) != 0) { | |
2871 | error("connect_to %.100s: unknown host (%s)", host, | |
2872 | ssh_gai_strerror(gaierr)); | |
2873 | return NULL; | |
5260325f | 2874 | } |
e07e21ad | 2875 | |
2876 | cctx.host = xstrdup(host); | |
2877 | cctx.port = port; | |
2878 | cctx.ai = cctx.aitop; | |
2879 | ||
2880 | if ((sock = connect_next(&cctx)) == -1) { | |
2881 | error("connect to %.100s port %d failed: %s", | |
2882 | host, port, strerror(errno)); | |
2883 | channel_connect_ctx_free(&cctx); | |
2884 | return NULL; | |
8efc0c15 | 2885 | } |
e07e21ad | 2886 | c = channel_new(ctype, SSH_CHANNEL_CONNECTING, sock, sock, -1, |
2887 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, rname, 1); | |
2888 | c->connect_ctx = cctx; | |
2889 | return c; | |
7368a6c8 | 2890 | } |
01794848 | 2891 | |
e07e21ad | 2892 | Channel * |
2893 | channel_connect_by_listen_address(u_short listen_port, char *ctype, char *rname) | |
fa08c86b | 2894 | { |
2895 | int i; | |
01794848 | 2896 | |
e07e21ad | 2897 | for (i = 0; i < num_permitted_opens; i++) { |
d740ec16 | 2898 | if (permitted_opens[i].host_to_connect != NULL && |
e07e21ad | 2899 | permitted_opens[i].listen_port == listen_port) { |
01794848 | 2900 | return connect_to( |
fa08c86b | 2901 | permitted_opens[i].host_to_connect, |
e07e21ad | 2902 | permitted_opens[i].port_to_connect, ctype, rname); |
2903 | } | |
2904 | } | |
0b6fbf03 | 2905 | error("WARNING: Server requests forwarding for unknown listen_port %d", |
2906 | listen_port); | |
e07e21ad | 2907 | return NULL; |
fa08c86b | 2908 | } |
48e671d5 | 2909 | |
01794848 | 2910 | /* Check if connecting to that port is permitted and connect. */ |
e07e21ad | 2911 | Channel * |
2912 | channel_connect_to(const char *host, u_short port, char *ctype, char *rname) | |
01794848 | 2913 | { |
2fefbadf | 2914 | int i, permit, permit_adm = 1; |
01794848 | 2915 | |
2916 | permit = all_opens_permitted; | |
2917 | if (!permit) { | |
2918 | for (i = 0; i < num_permitted_opens; i++) | |
d740ec16 | 2919 | if (permitted_opens[i].host_to_connect != NULL && |
2920 | permitted_opens[i].port_to_connect == port && | |
01794848 | 2921 | strcmp(permitted_opens[i].host_to_connect, host) == 0) |
2922 | permit = 1; | |
2fefbadf | 2923 | } |
01794848 | 2924 | |
2fefbadf | 2925 | if (num_adm_permitted_opens > 0) { |
2926 | permit_adm = 0; | |
2927 | for (i = 0; i < num_adm_permitted_opens; i++) | |
2928 | if (permitted_adm_opens[i].host_to_connect != NULL && | |
2929 | permitted_adm_opens[i].port_to_connect == port && | |
2930 | strcmp(permitted_adm_opens[i].host_to_connect, host) | |
2931 | == 0) | |
2932 | permit_adm = 1; | |
01794848 | 2933 | } |
2fefbadf | 2934 | |
2935 | if (!permit || !permit_adm) { | |
bbe88b6d | 2936 | logit("Received request to connect to host %.100s port %d, " |
01794848 | 2937 | "but the request was denied.", host, port); |
e07e21ad | 2938 | return NULL; |
01794848 | 2939 | } |
e07e21ad | 2940 | return connect_to(host, port, ctype, rname); |
01794848 | 2941 | } |
2942 | ||
5e96b616 | 2943 | void |
2944 | channel_send_window_changes(void) | |
2945 | { | |
9a995072 | 2946 | u_int i; |
5e96b616 | 2947 | struct winsize ws; |
2948 | ||
2949 | for (i = 0; i < channels_alloc; i++) { | |
f8cc7664 | 2950 | if (channels[i] == NULL || !channels[i]->client_tty || |
5e96b616 | 2951 | channels[i]->type != SSH_CHANNEL_OPEN) |
2952 | continue; | |
2953 | if (ioctl(channels[i]->rfd, TIOCGWINSZ, &ws) < 0) | |
2954 | continue; | |
2955 | channel_request_start(i, "window-change", 0); | |
148de80c | 2956 | packet_put_int((u_int)ws.ws_col); |
2957 | packet_put_int((u_int)ws.ws_row); | |
2958 | packet_put_int((u_int)ws.ws_xpixel); | |
2959 | packet_put_int((u_int)ws.ws_ypixel); | |
5e96b616 | 2960 | packet_send(); |
2961 | } | |
2962 | } | |
2963 | ||
8e7895b8 | 2964 | /* -- X11 forwarding */ |
8efc0c15 | 2965 | |
aa3378df | 2966 | /* |
2967 | * Creates an internet domain socket for listening for X11 connections. | |
57f228e8 | 2968 | * Returns 0 and a suitable display number for the DISPLAY variable |
2969 | * stored in display_numberp , or -1 if an error occurs. | |
aa3378df | 2970 | */ |
c9d0ad9b | 2971 | int |
e6e573bd | 2972 | x11_create_display_inet(int x11_display_offset, int x11_use_localhost, |
d08341e6 | 2973 | int single_connection, u_int *display_numberp, int **chanids) |
8efc0c15 | 2974 | { |
ac151b18 | 2975 | Channel *nc = NULL; |
57112b5a | 2976 | int display_number, sock; |
2977 | u_short port; | |
48e671d5 | 2978 | struct addrinfo hints, *ai, *aitop; |
2979 | char strport[NI_MAXSERV]; | |
2980 | int gaierr, n, num_socks = 0, socks[NUM_SOCKS]; | |
5260325f | 2981 | |
59e5aff5 | 2982 | if (chanids == NULL) |
2983 | return -1; | |
2984 | ||
95f1eccc | 2985 | for (display_number = x11_display_offset; |
184eed6a | 2986 | display_number < MAX_DISPLAYS; |
2987 | display_number++) { | |
5260325f | 2988 | port = 6000 + display_number; |
48e671d5 | 2989 | memset(&hints, 0, sizeof(hints)); |
2990 | hints.ai_family = IPv4or6; | |
e6e573bd | 2991 | hints.ai_flags = x11_use_localhost ? 0: AI_PASSIVE; |
48e671d5 | 2992 | hints.ai_socktype = SOCK_STREAM; |
2993 | snprintf(strport, sizeof strport, "%d", port); | |
2994 | if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) { | |
bb4626fe | 2995 | error("getaddrinfo: %.100s", ssh_gai_strerror(gaierr)); |
c9d0ad9b | 2996 | return -1; |
5260325f | 2997 | } |
48e671d5 | 2998 | for (ai = aitop; ai; ai = ai->ai_next) { |
2999 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
3000 | continue; | |
3e131a6d | 3001 | sock = socket(ai->ai_family, ai->ai_socktype, |
3002 | ai->ai_protocol); | |
48e671d5 | 3003 | if (sock < 0) { |
4ee81249 | 3004 | if ((errno != EINVAL) && (errno != EAFNOSUPPORT)) { |
80a44451 | 3005 | error("socket: %.100s", strerror(errno)); |
0ea89f7e | 3006 | freeaddrinfo(aitop); |
c9d0ad9b | 3007 | return -1; |
80a44451 | 3008 | } else { |
22d89d24 | 3009 | debug("x11_create_display_inet: Socket family %d not supported", |
3010 | ai->ai_family); | |
80a44451 | 3011 | continue; |
3012 | } | |
48e671d5 | 3013 | } |
688aaeda | 3014 | #ifdef IPV6_V6ONLY |
3015 | if (ai->ai_family == AF_INET6) { | |
3016 | int on = 1; | |
3017 | if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) < 0) | |
3018 | error("setsockopt IPV6_V6ONLY: %.100s", strerror(errno)); | |
3019 | } | |
3020 | #endif | |
442aee3a | 3021 | channel_set_reuseaddr(sock); |
48e671d5 | 3022 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { |
d7ac5f18 | 3023 | debug2("bind port %d: %.100s", port, strerror(errno)); |
48e671d5 | 3024 | close(sock); |
16218745 | 3025 | |
48e671d5 | 3026 | for (n = 0; n < num_socks; n++) { |
48e671d5 | 3027 | close(socks[n]); |
3028 | } | |
3029 | num_socks = 0; | |
3030 | break; | |
3031 | } | |
3032 | socks[num_socks++] = sock; | |
80faa19f | 3033 | #ifndef DONT_TRY_OTHER_AF |
48e671d5 | 3034 | if (num_socks == NUM_SOCKS) |
3035 | break; | |
80faa19f | 3036 | #else |
688aaeda | 3037 | if (x11_use_localhost) { |
3038 | if (num_socks == NUM_SOCKS) | |
3039 | break; | |
3040 | } else { | |
3041 | break; | |
3042 | } | |
80faa19f | 3043 | #endif |
5260325f | 3044 | } |
4ccb01d6 | 3045 | freeaddrinfo(aitop); |
48e671d5 | 3046 | if (num_socks > 0) |
3047 | break; | |
5260325f | 3048 | } |
3049 | if (display_number >= MAX_DISPLAYS) { | |
3050 | error("Failed to allocate internet-domain X11 display socket."); | |
c9d0ad9b | 3051 | return -1; |
8efc0c15 | 3052 | } |
5260325f | 3053 | /* Start listening for connections on the socket. */ |
48e671d5 | 3054 | for (n = 0; n < num_socks; n++) { |
3055 | sock = socks[n]; | |
fce39749 | 3056 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { |
48e671d5 | 3057 | error("listen: %.100s", strerror(errno)); |
48e671d5 | 3058 | close(sock); |
c9d0ad9b | 3059 | return -1; |
a7effaac | 3060 | } |
a7effaac | 3061 | } |
5260325f | 3062 | |
48e671d5 | 3063 | /* Allocate a channel for each socket. */ |
52e3daed | 3064 | *chanids = xcalloc(num_socks + 1, sizeof(**chanids)); |
48e671d5 | 3065 | for (n = 0; n < num_socks; n++) { |
3066 | sock = socks[n]; | |
ac151b18 | 3067 | nc = channel_new("x11 listener", |
0b242b12 | 3068 | SSH_CHANNEL_X11_LISTENER, sock, sock, -1, |
3069 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, | |
0d942eff | 3070 | 0, "X11 inet listener", 1); |
3a0d3d54 | 3071 | nc->single_connection = single_connection; |
59e5aff5 | 3072 | (*chanids)[n] = nc->self; |
48e671d5 | 3073 | } |
59e5aff5 | 3074 | (*chanids)[n] = -1; |
5260325f | 3075 | |
c9d0ad9b | 3076 | /* Return the display number for the DISPLAY environment variable. */ |
57f228e8 | 3077 | *display_numberp = display_number; |
3078 | return (0); | |
8efc0c15 | 3079 | } |
3080 | ||
396c147e | 3081 | static int |
1e3b8b07 | 3082 | connect_local_xsocket(u_int dnr) |
8efc0c15 | 3083 | { |
5260325f | 3084 | int sock; |
3085 | struct sockaddr_un addr; | |
5260325f | 3086 | |
805e659f | 3087 | sock = socket(AF_UNIX, SOCK_STREAM, 0); |
3088 | if (sock < 0) | |
3089 | error("socket: %.100s", strerror(errno)); | |
3090 | memset(&addr, 0, sizeof(addr)); | |
3091 | addr.sun_family = AF_UNIX; | |
3092 | snprintf(addr.sun_path, sizeof addr.sun_path, _PATH_UNIX_X, dnr); | |
32596c7b | 3093 | if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) == 0) |
805e659f | 3094 | return sock; |
3095 | close(sock); | |
5260325f | 3096 | error("connect %.100s: %.100s", addr.sun_path, strerror(errno)); |
3097 | return -1; | |
8efc0c15 | 3098 | } |
3099 | ||
0b242b12 | 3100 | int |
3101 | x11_connect_display(void) | |
8efc0c15 | 3102 | { |
4f16046f | 3103 | u_int display_number; |
5260325f | 3104 | const char *display; |
0b242b12 | 3105 | char buf[1024], *cp; |
48e671d5 | 3106 | struct addrinfo hints, *ai, *aitop; |
3107 | char strport[NI_MAXSERV]; | |
4f16046f | 3108 | int gaierr, sock = 0; |
5260325f | 3109 | |
5260325f | 3110 | /* Try to open a socket for the local X server. */ |
3111 | display = getenv("DISPLAY"); | |
3112 | if (!display) { | |
3113 | error("DISPLAY not set."); | |
0b242b12 | 3114 | return -1; |
5260325f | 3115 | } |
aa3378df | 3116 | /* |
3117 | * Now we decode the value of the DISPLAY variable and make a | |
3118 | * connection to the real X server. | |
3119 | */ | |
3120 | ||
3121 | /* | |
3122 | * Check if it is a unix domain socket. Unix domain displays are in | |
3123 | * one of the following formats: unix:d[.s], :d[.s], ::d[.s] | |
3124 | */ | |
5260325f | 3125 | if (strncmp(display, "unix:", 5) == 0 || |
3126 | display[0] == ':') { | |
3127 | /* Connect to the unix domain socket. */ | |
4f16046f | 3128 | if (sscanf(strrchr(display, ':') + 1, "%u", &display_number) != 1) { |
5260325f | 3129 | error("Could not parse display number from DISPLAY: %.100s", |
184eed6a | 3130 | display); |
0b242b12 | 3131 | return -1; |
5260325f | 3132 | } |
3133 | /* Create a socket. */ | |
3134 | sock = connect_local_xsocket(display_number); | |
3135 | if (sock < 0) | |
0b242b12 | 3136 | return -1; |
5260325f | 3137 | |
3138 | /* OK, we now have a connection to the display. */ | |
0b242b12 | 3139 | return sock; |
5260325f | 3140 | } |
aa3378df | 3141 | /* |
3142 | * Connect to an inet socket. The DISPLAY value is supposedly | |
3143 | * hostname:d[.s], where hostname may also be numeric IP address. | |
3144 | */ | |
74860245 | 3145 | strlcpy(buf, display, sizeof(buf)); |
5260325f | 3146 | cp = strchr(buf, ':'); |
3147 | if (!cp) { | |
3148 | error("Could not find ':' in DISPLAY: %.100s", display); | |
0b242b12 | 3149 | return -1; |
5260325f | 3150 | } |
3151 | *cp = 0; | |
aa3378df | 3152 | /* buf now contains the host name. But first we parse the display number. */ |
4f16046f | 3153 | if (sscanf(cp + 1, "%u", &display_number) != 1) { |
5260325f | 3154 | error("Could not parse display number from DISPLAY: %.100s", |
184eed6a | 3155 | display); |
0b242b12 | 3156 | return -1; |
5260325f | 3157 | } |
5260325f | 3158 | |
48e671d5 | 3159 | /* Look up the host address */ |
3160 | memset(&hints, 0, sizeof(hints)); | |
3161 | hints.ai_family = IPv4or6; | |
3162 | hints.ai_socktype = SOCK_STREAM; | |
4f16046f | 3163 | snprintf(strport, sizeof strport, "%u", 6000 + display_number); |
48e671d5 | 3164 | if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) { |
bb4626fe | 3165 | error("%.100s: unknown host. (%s)", buf, |
3166 | ssh_gai_strerror(gaierr)); | |
0b242b12 | 3167 | return -1; |
8efc0c15 | 3168 | } |
48e671d5 | 3169 | for (ai = aitop; ai; ai = ai->ai_next) { |
3170 | /* Create a socket. */ | |
3e131a6d | 3171 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
48e671d5 | 3172 | if (sock < 0) { |
d7ac5f18 | 3173 | debug2("socket: %.100s", strerror(errno)); |
7368a6c8 | 3174 | continue; |
3175 | } | |
3176 | /* Connect it to the display. */ | |
3177 | if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) { | |
4f16046f | 3178 | debug2("connect %.100s port %u: %.100s", buf, |
7368a6c8 | 3179 | 6000 + display_number, strerror(errno)); |
3180 | close(sock); | |
3181 | continue; | |
3182 | } | |
3183 | /* Success */ | |
3184 | break; | |
48e671d5 | 3185 | } |
48e671d5 | 3186 | freeaddrinfo(aitop); |
3187 | if (!ai) { | |
4f16046f | 3188 | error("connect %.100s port %u: %.100s", buf, 6000 + display_number, |
48e671d5 | 3189 | strerror(errno)); |
0b242b12 | 3190 | return -1; |
8efc0c15 | 3191 | } |
bcc0381e | 3192 | set_nodelay(sock); |
0b242b12 | 3193 | return sock; |
3194 | } | |
5260325f | 3195 | |
0b242b12 | 3196 | /* |
3197 | * This is called when SSH_SMSG_X11_OPEN is received. The packet contains | |
3198 | * the remote channel number. We should do whatever we want, and respond | |
3199 | * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE. | |
3200 | */ | |
5260325f | 3201 | |
ebb90778 | 3202 | /* ARGSUSED */ |
0b242b12 | 3203 | void |
7819b5c3 | 3204 | x11_input_open(int type, u_int32_t seq, void *ctxt) |
0b242b12 | 3205 | { |
719fc62f | 3206 | Channel *c = NULL; |
3207 | int remote_id, sock = 0; | |
0b242b12 | 3208 | char *remote_host; |
5260325f | 3209 | |
719fc62f | 3210 | debug("Received X11 open request."); |
5260325f | 3211 | |
719fc62f | 3212 | remote_id = packet_get_int(); |
8e7895b8 | 3213 | |
3214 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) { | |
719fc62f | 3215 | remote_host = packet_get_string(NULL); |
0b242b12 | 3216 | } else { |
3217 | remote_host = xstrdup("unknown (remote did not supply name)"); | |
0b242b12 | 3218 | } |
95500969 | 3219 | packet_check_eom(); |
0b242b12 | 3220 | |
3221 | /* Obtain a connection to the real X display. */ | |
3222 | sock = x11_connect_display(); | |
719fc62f | 3223 | if (sock != -1) { |
3224 | /* Allocate a channel for this connection. */ | |
3225 | c = channel_new("connected x11 socket", | |
3226 | SSH_CHANNEL_X11_OPEN, sock, sock, -1, 0, 0, 0, | |
3227 | remote_host, 1); | |
3a0d3d54 | 3228 | c->remote_id = remote_id; |
3229 | c->force_drain = 1; | |
719fc62f | 3230 | } |
0d942eff | 3231 | xfree(remote_host); |
719fc62f | 3232 | if (c == NULL) { |
0b242b12 | 3233 | /* Send refusal to the remote host. */ |
3234 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
719fc62f | 3235 | packet_put_int(remote_id); |
0b242b12 | 3236 | } else { |
0b242b12 | 3237 | /* Send a confirmation to the remote host. */ |
3238 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
719fc62f | 3239 | packet_put_int(remote_id); |
3240 | packet_put_int(c->self); | |
0b242b12 | 3241 | } |
719fc62f | 3242 | packet_send(); |
8efc0c15 | 3243 | } |
3244 | ||
a22aff1f | 3245 | /* dummy protocol handler that denies SSH-1 requests (agent/x11) */ |
ebb90778 | 3246 | /* ARGSUSED */ |
a22aff1f | 3247 | void |
7819b5c3 | 3248 | deny_input_open(int type, u_int32_t seq, void *ctxt) |
a22aff1f | 3249 | { |
3250 | int rchan = packet_get_int(); | |
e1feb9bf | 3251 | |
6aacefa7 | 3252 | switch (type) { |
a22aff1f | 3253 | case SSH_SMSG_AGENT_OPEN: |
3254 | error("Warning: ssh server tried agent forwarding."); | |
3255 | break; | |
3256 | case SSH_SMSG_X11_OPEN: | |
3257 | error("Warning: ssh server tried X11 forwarding."); | |
3258 | break; | |
3259 | default: | |
7819b5c3 | 3260 | error("deny_input_open: type %d", type); |
a22aff1f | 3261 | break; |
3262 | } | |
1908529f | 3263 | error("Warning: this is probably a break-in attempt by a malicious server."); |
a22aff1f | 3264 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
3265 | packet_put_int(rchan); | |
3266 | packet_send(); | |
3267 | } | |
3268 | ||
aa3378df | 3269 | /* |
3270 | * Requests forwarding of X11 connections, generates fake authentication | |
3271 | * data, and enables authentication spoofing. | |
8e7895b8 | 3272 | * This should be called in the client only. |
aa3378df | 3273 | */ |
6ae2364d | 3274 | void |
9bf083eb | 3275 | x11_request_forwarding_with_spoofing(int client_session_id, const char *disp, |
0b242b12 | 3276 | const char *proto, const char *data) |
8efc0c15 | 3277 | { |
1e3b8b07 | 3278 | u_int data_len = (u_int) strlen(data) / 2; |
ef07103c | 3279 | u_int i, value; |
5260325f | 3280 | char *new_data; |
3281 | int screen_number; | |
3282 | const char *cp; | |
ca75d7de | 3283 | u_int32_t rnd = 0; |
5260325f | 3284 | |
4297b666 | 3285 | if (x11_saved_display == NULL) |
3286 | x11_saved_display = xstrdup(disp); | |
3287 | else if (strcmp(disp, x11_saved_display) != 0) { | |
ef07103c | 3288 | error("x11_request_forwarding_with_spoofing: different " |
3289 | "$DISPLAY already forwarded"); | |
3290 | return; | |
3291 | } | |
3292 | ||
0875ae22 | 3293 | cp = strchr(disp, ':'); |
5260325f | 3294 | if (cp) |
3295 | cp = strchr(cp, '.'); | |
3296 | if (cp) | |
d6d4897e | 3297 | screen_number = (u_int)strtonum(cp + 1, 0, 400, NULL); |
5260325f | 3298 | else |
3299 | screen_number = 0; | |
3300 | ||
ef07103c | 3301 | if (x11_saved_proto == NULL) { |
3302 | /* Save protocol name. */ | |
3303 | x11_saved_proto = xstrdup(proto); | |
3304 | /* | |
56964485 | 3305 | * Extract real authentication data and generate fake data |
ef07103c | 3306 | * of the same length. |
3307 | */ | |
3308 | x11_saved_data = xmalloc(data_len); | |
3309 | x11_fake_data = xmalloc(data_len); | |
3310 | for (i = 0; i < data_len; i++) { | |
3311 | if (sscanf(data + 2 * i, "%2x", &value) != 1) | |
3312 | fatal("x11_request_forwarding: bad " | |
3313 | "authentication data: %.100s", data); | |
3314 | if (i % 4 == 0) | |
3315 | rnd = arc4random(); | |
3316 | x11_saved_data[i] = value; | |
3317 | x11_fake_data[i] = rnd & 0xff; | |
3318 | rnd >>= 8; | |
3319 | } | |
3320 | x11_saved_data_len = data_len; | |
3321 | x11_fake_data_len = data_len; | |
3322 | } | |
5260325f | 3323 | |
3324 | /* Convert the fake data into hex. */ | |
ef07103c | 3325 | new_data = tohex(x11_fake_data, data_len); |
5260325f | 3326 | |
3327 | /* Send the request packet. */ | |
0b242b12 | 3328 | if (compat20) { |
3329 | channel_request_start(client_session_id, "x11-req", 0); | |
3330 | packet_put_char(0); /* XXX bool single connection */ | |
3331 | } else { | |
3332 | packet_start(SSH_CMSG_X11_REQUEST_FORWARDING); | |
3333 | } | |
3334 | packet_put_cstring(proto); | |
3335 | packet_put_cstring(new_data); | |
5260325f | 3336 | packet_put_int(screen_number); |
3337 | packet_send(); | |
3338 | packet_write_wait(); | |
3339 | xfree(new_data); | |
8efc0c15 | 3340 | } |
3341 | ||
8e7895b8 | 3342 | |
3343 | /* -- agent forwarding */ | |
3344 | ||
8efc0c15 | 3345 | /* Sends a message to the server to request authentication fd forwarding. */ |
3346 | ||
6ae2364d | 3347 | void |
d5bb9418 | 3348 | auth_request_forwarding(void) |
8efc0c15 | 3349 | { |
5260325f | 3350 | packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING); |
3351 | packet_send(); | |
3352 | packet_write_wait(); | |
8efc0c15 | 3353 | } |