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a858eae9 | 1 | /* $OpenBSD: channels.c,v 1.302 2010/01/26 01:28:35 djm Exp $ */ |
8efc0c15 | 2 | /* |
5260325f | 3 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
5260325f | 4 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
5 | * All rights reserved | |
5260325f | 6 | * This file contains functions for generic socket connection forwarding. |
7 | * There is also code for initiating connection forwarding for X11 connections, | |
8 | * arbitrary tcp/ip connections, and the authentication agent connection. | |
6ae2364d | 9 | * |
bcbf86ec | 10 | * As far as I am concerned, the code I have written for this software |
11 | * can be used freely for any purpose. Any derived versions of this | |
12 | * software must be clearly marked as such, and if the derived work is | |
13 | * incompatible with the protocol description in the RFC file, it must be | |
14 | * called by a name other than "ssh" or "Secure Shell". | |
15 | * | |
7e7327a1 | 16 | * SSH2 support added by Markus Friedl. |
8341f420 | 17 | * Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved. |
bcbf86ec | 18 | * Copyright (c) 1999 Dug Song. All rights reserved. |
19 | * Copyright (c) 1999 Theo de Raadt. All rights reserved. | |
20 | * | |
21 | * Redistribution and use in source and binary forms, with or without | |
22 | * modification, are permitted provided that the following conditions | |
23 | * are met: | |
24 | * 1. Redistributions of source code must retain the above copyright | |
25 | * notice, this list of conditions and the following disclaimer. | |
26 | * 2. Redistributions in binary form must reproduce the above copyright | |
27 | * notice, this list of conditions and the following disclaimer in the | |
28 | * documentation and/or other materials provided with the distribution. | |
29 | * | |
30 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
31 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
32 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
33 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
34 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
35 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
36 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
37 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
38 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
39 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
5260325f | 40 | */ |
8efc0c15 | 41 | |
42 | #include "includes.h" | |
bd7c69ea | 43 | |
cebb4c24 | 44 | #include <sys/types.h> |
31652869 | 45 | #include <sys/ioctl.h> |
cebb4c24 | 46 | #include <sys/un.h> |
319d6b41 | 47 | #include <sys/socket.h> |
e264ac72 | 48 | #ifdef HAVE_SYS_TIME_H |
49 | # include <sys/time.h> | |
50 | #endif | |
319d6b41 | 51 | |
52 | #include <netinet/in.h> | |
53 | #include <arpa/inet.h> | |
1d3e026f | 54 | |
028094f4 | 55 | #include <errno.h> |
fe5bc072 | 56 | #include <fcntl.h> |
28cb0a43 | 57 | #include <netdb.h> |
cf851879 | 58 | #include <stdio.h> |
ffa517a8 | 59 | #include <stdlib.h> |
00146caa | 60 | #include <string.h> |
1d3e026f | 61 | #include <termios.h> |
5188ba17 | 62 | #include <unistd.h> |
31652869 | 63 | #include <stdarg.h> |
8efc0c15 | 64 | |
3593bdc0 | 65 | #include "openbsd-compat/sys-queue.h" |
31652869 | 66 | #include "xmalloc.h" |
8efc0c15 | 67 | #include "ssh.h" |
42f11eb2 | 68 | #include "ssh1.h" |
69 | #include "ssh2.h" | |
8efc0c15 | 70 | #include "packet.h" |
42f11eb2 | 71 | #include "log.h" |
72 | #include "misc.h" | |
31652869 | 73 | #include "buffer.h" |
8efc0c15 | 74 | #include "channels.h" |
8efc0c15 | 75 | #include "compat.h" |
42f11eb2 | 76 | #include "canohost.h" |
4c8722d9 | 77 | #include "key.h" |
78 | #include "authfd.h" | |
805e659f | 79 | #include "pathnames.h" |
8efc0c15 | 80 | |
8e7895b8 | 81 | /* -- channel core */ |
8efc0c15 | 82 | |
aa3378df | 83 | /* |
84 | * Pointer to an array containing all allocated channels. The array is | |
85 | * dynamically extended as needed. | |
86 | */ | |
719fc62f | 87 | static Channel **channels = NULL; |
8efc0c15 | 88 | |
aa3378df | 89 | /* |
90 | * Size of the channel array. All slots of the array must always be | |
719fc62f | 91 | * initialized (at least the type field); unused slots set to NULL |
aa3378df | 92 | */ |
9a995072 | 93 | static u_int channels_alloc = 0; |
8efc0c15 | 94 | |
aa3378df | 95 | /* |
96 | * Maximum file descriptor value used in any of the channels. This is | |
719fc62f | 97 | * updated in channel_new. |
aa3378df | 98 | */ |
39929cdb | 99 | static int channel_max_fd = 0; |
8efc0c15 | 100 | |
8efc0c15 | 101 | |
8e7895b8 | 102 | /* -- tcp forwarding */ |
8efc0c15 | 103 | |
aa3378df | 104 | /* |
105 | * Data structure for storing which hosts are permitted for forward requests. | |
106 | * The local sides of any remote forwards are stored in this array to prevent | |
107 | * a corrupt remote server from accessing arbitrary TCP/IP ports on our local | |
108 | * network (which might be behind a firewall). | |
109 | */ | |
5260325f | 110 | typedef struct { |
7368a6c8 | 111 | char *host_to_connect; /* Connect to 'host'. */ |
112 | u_short port_to_connect; /* Connect to 'port'. */ | |
113 | u_short listen_port; /* Remote side should listen port number. */ | |
8efc0c15 | 114 | } ForwardPermission; |
115 | ||
2fefbadf | 116 | /* List of all permitted host/port pairs to connect by the user. */ |
8efc0c15 | 117 | static ForwardPermission permitted_opens[SSH_MAX_FORWARDS_PER_DIRECTION]; |
8e7895b8 | 118 | |
2fefbadf | 119 | /* List of all permitted host/port pairs to connect by the admin. */ |
120 | static ForwardPermission permitted_adm_opens[SSH_MAX_FORWARDS_PER_DIRECTION]; | |
121 | ||
122 | /* Number of permitted host/port pairs in the array permitted by the user. */ | |
8efc0c15 | 123 | static int num_permitted_opens = 0; |
2fefbadf | 124 | |
125 | /* Number of permitted host/port pair in the array permitted by the admin. */ | |
126 | static int num_adm_permitted_opens = 0; | |
127 | ||
aa3378df | 128 | /* |
129 | * If this is true, all opens are permitted. This is the case on the server | |
130 | * on which we have to trust the client anyway, and the user could do | |
131 | * anything after logging in anyway. | |
132 | */ | |
8efc0c15 | 133 | static int all_opens_permitted = 0; |
134 | ||
8efc0c15 | 135 | |
8e7895b8 | 136 | /* -- X11 forwarding */ |
42f11eb2 | 137 | |
8e7895b8 | 138 | /* Maximum number of fake X11 displays to try. */ |
139 | #define MAX_DISPLAYS 1000 | |
0490e609 | 140 | |
ef07103c | 141 | /* Saved X11 local (client) display. */ |
142 | static char *x11_saved_display = NULL; | |
143 | ||
8e7895b8 | 144 | /* Saved X11 authentication protocol name. */ |
145 | static char *x11_saved_proto = NULL; | |
8efc0c15 | 146 | |
8e7895b8 | 147 | /* Saved X11 authentication data. This is the real data. */ |
148 | static char *x11_saved_data = NULL; | |
149 | static u_int x11_saved_data_len = 0; | |
150 | ||
151 | /* | |
152 | * Fake X11 authentication data. This is what the server will be sending us; | |
153 | * we should replace any occurrences of this by the real data. | |
154 | */ | |
338eb2ab | 155 | static u_char *x11_fake_data = NULL; |
8e7895b8 | 156 | static u_int x11_fake_data_len; |
157 | ||
158 | ||
159 | /* -- agent forwarding */ | |
8efc0c15 | 160 | |
8e7895b8 | 161 | #define NUM_SOCKS 10 |
162 | ||
8e7895b8 | 163 | /* AF_UNSPEC or AF_INET or AF_INET6 */ |
5e4a7219 | 164 | static int IPv4or6 = AF_UNSPEC; |
8e7895b8 | 165 | |
166 | /* helper */ | |
396c147e | 167 | static void port_open_helper(Channel *c, char *rtype); |
8e7895b8 | 168 | |
e07e21ad | 169 | /* non-blocking connect helpers */ |
170 | static int connect_next(struct channel_connect *); | |
171 | static void channel_connect_ctx_free(struct channel_connect *); | |
172 | ||
8e7895b8 | 173 | /* -- channel core */ |
7368a6c8 | 174 | |
175 | Channel * | |
b872f7f0 | 176 | channel_by_id(int id) |
7368a6c8 | 177 | { |
178 | Channel *c; | |
719fc62f | 179 | |
9a995072 | 180 | if (id < 0 || (u_int)id >= channels_alloc) { |
b872f7f0 | 181 | logit("channel_by_id: %d: bad id", id); |
7368a6c8 | 182 | return NULL; |
183 | } | |
719fc62f | 184 | c = channels[id]; |
185 | if (c == NULL) { | |
b872f7f0 | 186 | logit("channel_by_id: %d: bad id: channel free", id); |
7368a6c8 | 187 | return NULL; |
188 | } | |
189 | return c; | |
190 | } | |
191 | ||
b872f7f0 | 192 | /* |
193 | * Returns the channel if it is allowed to receive protocol messages. | |
194 | * Private channels, like listening sockets, may not receive messages. | |
195 | */ | |
196 | Channel * | |
197 | channel_lookup(int id) | |
198 | { | |
199 | Channel *c; | |
200 | ||
201 | if ((c = channel_by_id(id)) == NULL) | |
202 | return (NULL); | |
203 | ||
c8e9c167 | 204 | switch (c->type) { |
b872f7f0 | 205 | case SSH_CHANNEL_X11_OPEN: |
206 | case SSH_CHANNEL_LARVAL: | |
207 | case SSH_CHANNEL_CONNECTING: | |
208 | case SSH_CHANNEL_DYNAMIC: | |
209 | case SSH_CHANNEL_OPENING: | |
210 | case SSH_CHANNEL_OPEN: | |
211 | case SSH_CHANNEL_INPUT_DRAINING: | |
212 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
213 | return (c); | |
b872f7f0 | 214 | } |
215 | logit("Non-public channel %d, type %d.", id, c->type); | |
216 | return (NULL); | |
217 | } | |
218 | ||
aa3378df | 219 | /* |
1d1ffb87 | 220 | * Register filedescriptors for a channel, used when allocating a channel or |
0fbe8c74 | 221 | * when the channel consumer/producer is ready, e.g. shell exec'd |
aa3378df | 222 | */ |
396c147e | 223 | static void |
a22aff1f | 224 | channel_register_fds(Channel *c, int rfd, int wfd, int efd, |
b3784859 | 225 | int extusage, int nonblock, int is_tty) |
8efc0c15 | 226 | { |
5260325f | 227 | /* Update the maximum file descriptor value. */ |
39929cdb | 228 | channel_max_fd = MAX(channel_max_fd, rfd); |
229 | channel_max_fd = MAX(channel_max_fd, wfd); | |
230 | channel_max_fd = MAX(channel_max_fd, efd); | |
231 | ||
fe5bc072 | 232 | if (rfd != -1) |
233 | fcntl(rfd, F_SETFD, FD_CLOEXEC); | |
234 | if (wfd != -1 && wfd != rfd) | |
235 | fcntl(wfd, F_SETFD, FD_CLOEXEC); | |
236 | if (efd != -1 && efd != rfd && efd != wfd) | |
237 | fcntl(efd, F_SETFD, FD_CLOEXEC); | |
1d1ffb87 | 238 | |
0fbe8c74 | 239 | c->rfd = rfd; |
240 | c->wfd = wfd; | |
241 | c->sock = (rfd == wfd) ? rfd : -1; | |
242 | c->efd = efd; | |
243 | c->extended_usage = extusage; | |
a22aff1f | 244 | |
b3784859 | 245 | if ((c->isatty = is_tty) != 0) |
d7ac5f18 | 246 | debug2("channel %d: rfd %d isatty", c->self, c->rfd); |
245f4d36 | 247 | c->wfd_isatty = is_tty || isatty(c->wfd); |
0ae4fe1d | 248 | |
a22aff1f | 249 | /* enable nonblocking mode */ |
250 | if (nonblock) { | |
251 | if (rfd != -1) | |
252 | set_nonblock(rfd); | |
253 | if (wfd != -1) | |
254 | set_nonblock(wfd); | |
255 | if (efd != -1) | |
256 | set_nonblock(efd); | |
257 | } | |
0fbe8c74 | 258 | } |
259 | ||
260 | /* | |
261 | * Allocate a new channel object and set its type and socket. This will cause | |
262 | * remote_name to be freed. | |
263 | */ | |
719fc62f | 264 | Channel * |
0fbe8c74 | 265 | channel_new(char *ctype, int type, int rfd, int wfd, int efd, |
f91d9a89 | 266 | u_int window, u_int maxpack, int extusage, char *remote_name, int nonblock) |
0fbe8c74 | 267 | { |
9a995072 | 268 | int found; |
269 | u_int i; | |
0fbe8c74 | 270 | Channel *c; |
5260325f | 271 | |
272 | /* Do initial allocation if this is the first call. */ | |
273 | if (channels_alloc == 0) { | |
274 | channels_alloc = 10; | |
52e3daed | 275 | channels = xcalloc(channels_alloc, sizeof(Channel *)); |
5260325f | 276 | for (i = 0; i < channels_alloc; i++) |
719fc62f | 277 | channels[i] = NULL; |
5260325f | 278 | } |
279 | /* Try to find a free slot where to put the new channel. */ | |
280 | for (found = -1, i = 0; i < channels_alloc; i++) | |
719fc62f | 281 | if (channels[i] == NULL) { |
5260325f | 282 | /* Found a free slot. */ |
9a995072 | 283 | found = (int)i; |
5260325f | 284 | break; |
285 | } | |
9a995072 | 286 | if (found < 0) { |
aa3378df | 287 | /* There are no free slots. Take last+1 slot and expand the array. */ |
5260325f | 288 | found = channels_alloc; |
5df8c731 | 289 | if (channels_alloc > 10000) |
290 | fatal("channel_new: internal error: channels_alloc %d " | |
291 | "too big.", channels_alloc); | |
c5d10563 | 292 | channels = xrealloc(channels, channels_alloc + 10, |
293 | sizeof(Channel *)); | |
20419cc1 | 294 | channels_alloc += 10; |
de273eef | 295 | debug2("channel: expanding %d", channels_alloc); |
5260325f | 296 | for (i = found; i < channels_alloc; i++) |
719fc62f | 297 | channels[i] = NULL; |
5260325f | 298 | } |
719fc62f | 299 | /* Initialize and return new channel. */ |
52e3daed | 300 | c = channels[found] = xcalloc(1, sizeof(Channel)); |
5260325f | 301 | buffer_init(&c->input); |
302 | buffer_init(&c->output); | |
7368a6c8 | 303 | buffer_init(&c->extended); |
1338ba77 | 304 | c->path = NULL; |
70bef40e | 305 | c->ostate = CHAN_OUTPUT_OPEN; |
306 | c->istate = CHAN_INPUT_OPEN; | |
307 | c->flags = 0; | |
c9478090 | 308 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock, 0); |
5260325f | 309 | c->self = found; |
310 | c->type = type; | |
7368a6c8 | 311 | c->ctype = ctype; |
0b242b12 | 312 | c->local_window = window; |
313 | c->local_window_max = window; | |
314 | c->local_consumed = 0; | |
315 | c->local_maxpacket = maxpack; | |
5260325f | 316 | c->remote_id = -1; |
0d942eff | 317 | c->remote_name = xstrdup(remote_name); |
7368a6c8 | 318 | c->remote_window = 0; |
319 | c->remote_maxpacket = 0; | |
a5f82435 | 320 | c->force_drain = 0; |
ac151b18 | 321 | c->single_connection = 0; |
3cf2be58 | 322 | c->detach_user = NULL; |
8cd0437d | 323 | c->detach_close = 0; |
3593bdc0 | 324 | c->open_confirm = NULL; |
325 | c->open_confirm_ctx = NULL; | |
2e73a022 | 326 | c->input_filter = NULL; |
c1c6a032 | 327 | c->output_filter = NULL; |
e74caf1e | 328 | c->filter_ctx = NULL; |
329 | c->filter_cleanup = NULL; | |
a858eae9 | 330 | c->ctl_chan = -1; |
331 | c->mux_rcb = NULL; | |
332 | c->mux_ctx = NULL; | |
7501ed0d | 333 | c->delayed = 1; /* prevent call to channel_post handler */ |
3593bdc0 | 334 | TAILQ_INIT(&c->status_confirms); |
5260325f | 335 | debug("channel %d: new [%s]", found, remote_name); |
719fc62f | 336 | return c; |
7368a6c8 | 337 | } |
8efc0c15 | 338 | |
489aa2e9 | 339 | static int |
340 | channel_find_maxfd(void) | |
341 | { | |
9a995072 | 342 | u_int i; |
343 | int max = 0; | |
489aa2e9 | 344 | Channel *c; |
345 | ||
346 | for (i = 0; i < channels_alloc; i++) { | |
347 | c = channels[i]; | |
348 | if (c != NULL) { | |
349 | max = MAX(max, c->rfd); | |
350 | max = MAX(max, c->wfd); | |
351 | max = MAX(max, c->efd); | |
352 | } | |
353 | } | |
354 | return max; | |
355 | } | |
356 | ||
357 | int | |
358 | channel_close_fd(int *fdp) | |
359 | { | |
360 | int ret = 0, fd = *fdp; | |
361 | ||
362 | if (fd != -1) { | |
363 | ret = close(fd); | |
364 | *fdp = -1; | |
365 | if (fd == channel_max_fd) | |
366 | channel_max_fd = channel_find_maxfd(); | |
367 | } | |
368 | return ret; | |
369 | } | |
370 | ||
0fbe8c74 | 371 | /* Close all channel fd/socket. */ |
396c147e | 372 | static void |
0fbe8c74 | 373 | channel_close_fds(Channel *c) |
374 | { | |
a858eae9 | 375 | debug3("channel %d: close_fds r %d w %d e %d", |
376 | c->self, c->rfd, c->wfd, c->efd); | |
6fd8622b | 377 | |
489aa2e9 | 378 | channel_close_fd(&c->sock); |
379 | channel_close_fd(&c->rfd); | |
380 | channel_close_fd(&c->wfd); | |
381 | channel_close_fd(&c->efd); | |
0fbe8c74 | 382 | } |
383 | ||
8e7895b8 | 384 | /* Free the channel and close its fd/socket. */ |
8e7895b8 | 385 | void |
386 | channel_free(Channel *c) | |
387 | { | |
388 | char *s; | |
9a995072 | 389 | u_int i, n; |
3593bdc0 | 390 | struct channel_confirm *cc; |
8e7895b8 | 391 | |
392 | for (n = 0, i = 0; i < channels_alloc; i++) | |
393 | if (channels[i]) | |
394 | n++; | |
9a995072 | 395 | debug("channel %d: free: %s, nchannels %u", c->self, |
8e7895b8 | 396 | c->remote_name ? c->remote_name : "???", n); |
397 | ||
398 | s = channel_open_message(); | |
d7ac5f18 | 399 | debug3("channel %d: status: %s", c->self, s); |
8e7895b8 | 400 | xfree(s); |
401 | ||
8e7895b8 | 402 | if (c->sock != -1) |
403 | shutdown(c->sock, SHUT_RDWR); | |
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 | } | |
1338ba77 | 412 | if (c->path) { |
413 | xfree(c->path); | |
414 | c->path = NULL; | |
415 | } | |
3593bdc0 | 416 | while ((cc = TAILQ_FIRST(&c->status_confirms)) != NULL) { |
417 | if (cc->abandon_cb != NULL) | |
418 | cc->abandon_cb(c, cc->ctx); | |
419 | TAILQ_REMOVE(&c->status_confirms, cc, entry); | |
420 | bzero(cc, sizeof(*cc)); | |
421 | xfree(cc); | |
422 | } | |
e74caf1e | 423 | if (c->filter_cleanup != NULL && c->filter_ctx != NULL) |
424 | c->filter_cleanup(c->self, c->filter_ctx); | |
8e7895b8 | 425 | channels[c->self] = NULL; |
426 | xfree(c); | |
427 | } | |
428 | ||
8e7895b8 | 429 | void |
d6746a0b | 430 | channel_free_all(void) |
8e7895b8 | 431 | { |
9a995072 | 432 | u_int i; |
8e7895b8 | 433 | |
d6746a0b | 434 | for (i = 0; i < channels_alloc; i++) |
435 | if (channels[i] != NULL) | |
436 | channel_free(channels[i]); | |
8e7895b8 | 437 | } |
438 | ||
439 | /* | |
440 | * Closes the sockets/fds of all channels. This is used to close extra file | |
441 | * descriptors after a fork. | |
442 | */ | |
8e7895b8 | 443 | void |
d5bb9418 | 444 | channel_close_all(void) |
8e7895b8 | 445 | { |
9a995072 | 446 | u_int i; |
8e7895b8 | 447 | |
448 | for (i = 0; i < channels_alloc; i++) | |
449 | if (channels[i] != NULL) | |
450 | channel_close_fds(channels[i]); | |
451 | } | |
452 | ||
3cf2be58 | 453 | /* |
454 | * Stop listening to channels. | |
455 | */ | |
3cf2be58 | 456 | void |
457 | channel_stop_listening(void) | |
458 | { | |
9a995072 | 459 | u_int i; |
3cf2be58 | 460 | Channel *c; |
461 | ||
462 | for (i = 0; i < channels_alloc; i++) { | |
463 | c = channels[i]; | |
464 | if (c != NULL) { | |
465 | switch (c->type) { | |
466 | case SSH_CHANNEL_AUTH_SOCKET: | |
467 | case SSH_CHANNEL_PORT_LISTENER: | |
468 | case SSH_CHANNEL_RPORT_LISTENER: | |
469 | case SSH_CHANNEL_X11_LISTENER: | |
489aa2e9 | 470 | channel_close_fd(&c->sock); |
3cf2be58 | 471 | channel_free(c); |
472 | break; | |
473 | } | |
474 | } | |
475 | } | |
476 | } | |
477 | ||
8e7895b8 | 478 | /* |
479 | * Returns true if no channel has too much buffered data, and false if one or | |
480 | * more channel is overfull. | |
481 | */ | |
8e7895b8 | 482 | int |
d5bb9418 | 483 | channel_not_very_much_buffered_data(void) |
8e7895b8 | 484 | { |
485 | u_int i; | |
486 | Channel *c; | |
487 | ||
488 | for (i = 0; i < channels_alloc; i++) { | |
489 | c = channels[i]; | |
490 | if (c != NULL && c->type == SSH_CHANNEL_OPEN) { | |
0c139bd1 | 491 | #if 0 |
492 | if (!compat20 && | |
493 | buffer_len(&c->input) > packet_get_maxsize()) { | |
faa483fa | 494 | debug2("channel %d: big input buffer %d", |
8e7895b8 | 495 | c->self, buffer_len(&c->input)); |
496 | return 0; | |
497 | } | |
0c139bd1 | 498 | #endif |
8e7895b8 | 499 | if (buffer_len(&c->output) > packet_get_maxsize()) { |
a27002e5 | 500 | debug2("channel %d: big output buffer %u > %u", |
0c139bd1 | 501 | c->self, buffer_len(&c->output), |
502 | packet_get_maxsize()); | |
8e7895b8 | 503 | return 0; |
504 | } | |
505 | } | |
506 | } | |
507 | return 1; | |
508 | } | |
509 | ||
510 | /* Returns true if any channel is still open. */ | |
8e7895b8 | 511 | int |
d5bb9418 | 512 | channel_still_open(void) |
8e7895b8 | 513 | { |
9a995072 | 514 | u_int i; |
8e7895b8 | 515 | Channel *c; |
516 | ||
517 | for (i = 0; i < channels_alloc; i++) { | |
518 | c = channels[i]; | |
519 | if (c == NULL) | |
520 | continue; | |
521 | switch (c->type) { | |
522 | case SSH_CHANNEL_X11_LISTENER: | |
523 | case SSH_CHANNEL_PORT_LISTENER: | |
524 | case SSH_CHANNEL_RPORT_LISTENER: | |
a858eae9 | 525 | case SSH_CHANNEL_MUX_LISTENER: |
8e7895b8 | 526 | case SSH_CHANNEL_CLOSED: |
527 | case SSH_CHANNEL_AUTH_SOCKET: | |
528 | case SSH_CHANNEL_DYNAMIC: | |
529 | case SSH_CHANNEL_CONNECTING: | |
530 | case SSH_CHANNEL_ZOMBIE: | |
531 | continue; | |
532 | case SSH_CHANNEL_LARVAL: | |
533 | if (!compat20) | |
534 | fatal("cannot happen: SSH_CHANNEL_LARVAL"); | |
535 | continue; | |
536 | case SSH_CHANNEL_OPENING: | |
537 | case SSH_CHANNEL_OPEN: | |
538 | case SSH_CHANNEL_X11_OPEN: | |
a858eae9 | 539 | case SSH_CHANNEL_MUX_CLIENT: |
8e7895b8 | 540 | return 1; |
541 | case SSH_CHANNEL_INPUT_DRAINING: | |
542 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
543 | if (!compat13) | |
544 | fatal("cannot happen: OUT_DRAIN"); | |
545 | return 1; | |
546 | default: | |
547 | fatal("channel_still_open: bad channel type %d", c->type); | |
548 | /* NOTREACHED */ | |
549 | } | |
550 | } | |
551 | return 0; | |
552 | } | |
553 | ||
554 | /* Returns the id of an open channel suitable for keepaliving */ | |
8e7895b8 | 555 | int |
d5bb9418 | 556 | channel_find_open(void) |
8e7895b8 | 557 | { |
9a995072 | 558 | u_int i; |
8e7895b8 | 559 | Channel *c; |
560 | ||
561 | for (i = 0; i < channels_alloc; i++) { | |
562 | c = channels[i]; | |
13de3560 | 563 | if (c == NULL || c->remote_id < 0) |
8e7895b8 | 564 | continue; |
565 | switch (c->type) { | |
566 | case SSH_CHANNEL_CLOSED: | |
567 | case SSH_CHANNEL_DYNAMIC: | |
568 | case SSH_CHANNEL_X11_LISTENER: | |
569 | case SSH_CHANNEL_PORT_LISTENER: | |
570 | case SSH_CHANNEL_RPORT_LISTENER: | |
a858eae9 | 571 | case SSH_CHANNEL_MUX_LISTENER: |
572 | case SSH_CHANNEL_MUX_CLIENT: | |
8e7895b8 | 573 | case SSH_CHANNEL_OPENING: |
574 | case SSH_CHANNEL_CONNECTING: | |
575 | case SSH_CHANNEL_ZOMBIE: | |
576 | continue; | |
577 | case SSH_CHANNEL_LARVAL: | |
578 | case SSH_CHANNEL_AUTH_SOCKET: | |
579 | case SSH_CHANNEL_OPEN: | |
580 | case SSH_CHANNEL_X11_OPEN: | |
581 | return i; | |
582 | case SSH_CHANNEL_INPUT_DRAINING: | |
583 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
584 | if (!compat13) | |
585 | fatal("cannot happen: OUT_DRAIN"); | |
586 | return i; | |
587 | default: | |
588 | fatal("channel_find_open: bad channel type %d", c->type); | |
589 | /* NOTREACHED */ | |
590 | } | |
591 | } | |
592 | return -1; | |
593 | } | |
594 | ||
595 | ||
596 | /* | |
597 | * Returns a message describing the currently open forwarded connections, | |
598 | * suitable for sending to the client. The message contains crlf pairs for | |
599 | * newlines. | |
600 | */ | |
8e7895b8 | 601 | char * |
d5bb9418 | 602 | channel_open_message(void) |
8e7895b8 | 603 | { |
604 | Buffer buffer; | |
605 | Channel *c; | |
606 | char buf[1024], *cp; | |
9a995072 | 607 | u_int i; |
8e7895b8 | 608 | |
609 | buffer_init(&buffer); | |
610 | snprintf(buf, sizeof buf, "The following connections are open:\r\n"); | |
611 | buffer_append(&buffer, buf, strlen(buf)); | |
612 | for (i = 0; i < channels_alloc; i++) { | |
613 | c = channels[i]; | |
614 | if (c == NULL) | |
615 | continue; | |
616 | switch (c->type) { | |
617 | case SSH_CHANNEL_X11_LISTENER: | |
618 | case SSH_CHANNEL_PORT_LISTENER: | |
619 | case SSH_CHANNEL_RPORT_LISTENER: | |
620 | case SSH_CHANNEL_CLOSED: | |
621 | case SSH_CHANNEL_AUTH_SOCKET: | |
622 | case SSH_CHANNEL_ZOMBIE: | |
a858eae9 | 623 | case SSH_CHANNEL_MUX_CLIENT: |
624 | case SSH_CHANNEL_MUX_LISTENER: | |
8e7895b8 | 625 | continue; |
626 | case SSH_CHANNEL_LARVAL: | |
627 | case SSH_CHANNEL_OPENING: | |
628 | case SSH_CHANNEL_CONNECTING: | |
629 | case SSH_CHANNEL_DYNAMIC: | |
630 | case SSH_CHANNEL_OPEN: | |
631 | case SSH_CHANNEL_X11_OPEN: | |
632 | case SSH_CHANNEL_INPUT_DRAINING: | |
633 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
5e96b616 | 634 | snprintf(buf, sizeof buf, |
a858eae9 | 635 | " #%d %.300s (t%d r%d i%d/%d o%d/%d fd %d/%d cc %d)\r\n", |
8e7895b8 | 636 | c->self, c->remote_name, |
637 | c->type, c->remote_id, | |
638 | c->istate, buffer_len(&c->input), | |
639 | c->ostate, buffer_len(&c->output), | |
a858eae9 | 640 | c->rfd, c->wfd, c->ctl_chan); |
8e7895b8 | 641 | buffer_append(&buffer, buf, strlen(buf)); |
642 | continue; | |
643 | default: | |
644 | fatal("channel_open_message: bad channel type %d", c->type); | |
645 | /* NOTREACHED */ | |
646 | } | |
647 | } | |
648 | buffer_append(&buffer, "\0", 1); | |
649 | cp = xstrdup(buffer_ptr(&buffer)); | |
650 | buffer_free(&buffer); | |
651 | return cp; | |
652 | } | |
653 | ||
654 | void | |
655 | channel_send_open(int id) | |
656 | { | |
657 | Channel *c = channel_lookup(id); | |
e1feb9bf | 658 | |
8e7895b8 | 659 | if (c == NULL) { |
bbe88b6d | 660 | logit("channel_send_open: %d: bad id", id); |
8e7895b8 | 661 | return; |
662 | } | |
6226a8f8 | 663 | debug2("channel %d: send open", id); |
8e7895b8 | 664 | packet_start(SSH2_MSG_CHANNEL_OPEN); |
665 | packet_put_cstring(c->ctype); | |
666 | packet_put_int(c->self); | |
667 | packet_put_int(c->local_window); | |
668 | packet_put_int(c->local_maxpacket); | |
669 | packet_send(); | |
670 | } | |
671 | ||
672 | void | |
6226a8f8 | 673 | channel_request_start(int id, char *service, int wantconfirm) |
8e7895b8 | 674 | { |
6226a8f8 | 675 | Channel *c = channel_lookup(id); |
e1feb9bf | 676 | |
8e7895b8 | 677 | if (c == NULL) { |
bbe88b6d | 678 | logit("channel_request_start: %d: unknown channel id", id); |
8e7895b8 | 679 | return; |
680 | } | |
5e96b616 | 681 | debug2("channel %d: request %s confirm %d", id, service, wantconfirm); |
8e7895b8 | 682 | packet_start(SSH2_MSG_CHANNEL_REQUEST); |
683 | packet_put_int(c->remote_id); | |
684 | packet_put_cstring(service); | |
685 | packet_put_char(wantconfirm); | |
686 | } | |
a7137f6b | 687 | |
8e7895b8 | 688 | void |
3593bdc0 | 689 | channel_register_status_confirm(int id, channel_confirm_cb *cb, |
690 | channel_confirm_abandon_cb *abandon_cb, void *ctx) | |
691 | { | |
692 | struct channel_confirm *cc; | |
693 | Channel *c; | |
694 | ||
695 | if ((c = channel_lookup(id)) == NULL) | |
696 | fatal("channel_register_expect: %d: bad id", id); | |
697 | ||
698 | cc = xmalloc(sizeof(*cc)); | |
699 | cc->cb = cb; | |
700 | cc->abandon_cb = abandon_cb; | |
701 | cc->ctx = ctx; | |
702 | TAILQ_INSERT_TAIL(&c->status_confirms, cc, entry); | |
703 | } | |
704 | ||
705 | void | |
706 | channel_register_open_confirm(int id, channel_callback_fn *fn, void *ctx) | |
8e7895b8 | 707 | { |
708 | Channel *c = channel_lookup(id); | |
e1feb9bf | 709 | |
8e7895b8 | 710 | if (c == NULL) { |
2ea438c2 | 711 | logit("channel_register_open_confirm: %d: bad id", id); |
8e7895b8 | 712 | return; |
713 | } | |
3593bdc0 | 714 | c->open_confirm = fn; |
715 | c->open_confirm_ctx = ctx; | |
8e7895b8 | 716 | } |
a7137f6b | 717 | |
8e7895b8 | 718 | void |
8cd0437d | 719 | channel_register_cleanup(int id, channel_callback_fn *fn, int do_close) |
8e7895b8 | 720 | { |
b872f7f0 | 721 | Channel *c = channel_by_id(id); |
e1feb9bf | 722 | |
8e7895b8 | 723 | if (c == NULL) { |
bbe88b6d | 724 | logit("channel_register_cleanup: %d: bad id", id); |
8e7895b8 | 725 | return; |
726 | } | |
3cf2be58 | 727 | c->detach_user = fn; |
8cd0437d | 728 | c->detach_close = do_close; |
8e7895b8 | 729 | } |
a7137f6b | 730 | |
8e7895b8 | 731 | void |
732 | channel_cancel_cleanup(int id) | |
733 | { | |
b872f7f0 | 734 | Channel *c = channel_by_id(id); |
e1feb9bf | 735 | |
8e7895b8 | 736 | if (c == NULL) { |
bbe88b6d | 737 | logit("channel_cancel_cleanup: %d: bad id", id); |
8e7895b8 | 738 | return; |
739 | } | |
3cf2be58 | 740 | c->detach_user = NULL; |
8cd0437d | 741 | c->detach_close = 0; |
8e7895b8 | 742 | } |
a7137f6b | 743 | |
8e7895b8 | 744 | void |
c1c6a032 | 745 | channel_register_filter(int id, channel_infilter_fn *ifn, |
e74caf1e | 746 | channel_outfilter_fn *ofn, channel_filter_cleanup_fn *cfn, void *ctx) |
8e7895b8 | 747 | { |
748 | Channel *c = channel_lookup(id); | |
e1feb9bf | 749 | |
8e7895b8 | 750 | if (c == NULL) { |
bbe88b6d | 751 | logit("channel_register_filter: %d: bad id", id); |
8e7895b8 | 752 | return; |
753 | } | |
c1c6a032 | 754 | c->input_filter = ifn; |
755 | c->output_filter = ofn; | |
f17f705b | 756 | c->filter_ctx = ctx; |
e74caf1e | 757 | c->filter_cleanup = cfn; |
8e7895b8 | 758 | } |
759 | ||
6ae2364d | 760 | void |
8e7895b8 | 761 | channel_set_fds(int id, int rfd, int wfd, int efd, |
b3784859 | 762 | int extusage, int nonblock, int is_tty, u_int window_max) |
8efc0c15 | 763 | { |
8e7895b8 | 764 | Channel *c = channel_lookup(id); |
e1feb9bf | 765 | |
8e7895b8 | 766 | if (c == NULL || c->type != SSH_CHANNEL_LARVAL) |
767 | fatal("channel_activate for non-larval channel %d.", id); | |
b3784859 | 768 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock, is_tty); |
8e7895b8 | 769 | c->type = SSH_CHANNEL_OPEN; |
399d1ea6 | 770 | c->local_window = c->local_window_max = window_max; |
8e7895b8 | 771 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
772 | packet_put_int(c->remote_id); | |
773 | packet_put_int(c->local_window); | |
774 | packet_send(); | |
8efc0c15 | 775 | } |
776 | ||
aa3378df | 777 | /* |
7368a6c8 | 778 | * 'channel_pre*' are called just before select() to add any bits relevant to |
779 | * channels in the select bitmasks. | |
aa3378df | 780 | */ |
7368a6c8 | 781 | /* |
782 | * 'channel_post*': perform any appropriate operations for channels which | |
783 | * have events pending. | |
784 | */ | |
c8e9c167 | 785 | typedef void chan_fn(Channel *c, fd_set *readset, fd_set *writeset); |
7368a6c8 | 786 | chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE]; |
787 | chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE]; | |
8efc0c15 | 788 | |
ebb90778 | 789 | /* ARGSUSED */ |
396c147e | 790 | static void |
c8e9c167 | 791 | channel_pre_listener(Channel *c, fd_set *readset, fd_set *writeset) |
8efc0c15 | 792 | { |
7368a6c8 | 793 | FD_SET(c->sock, readset); |
794 | } | |
5260325f | 795 | |
ebb90778 | 796 | /* ARGSUSED */ |
396c147e | 797 | static void |
c8e9c167 | 798 | channel_pre_connecting(Channel *c, fd_set *readset, fd_set *writeset) |
97fb6912 | 799 | { |
800 | debug3("channel %d: waiting for connection", c->self); | |
801 | FD_SET(c->sock, writeset); | |
802 | } | |
803 | ||
396c147e | 804 | static void |
c8e9c167 | 805 | channel_pre_open_13(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 806 | { |
807 | if (buffer_len(&c->input) < packet_get_maxsize()) | |
808 | FD_SET(c->sock, readset); | |
809 | if (buffer_len(&c->output) > 0) | |
810 | FD_SET(c->sock, writeset); | |
811 | } | |
5260325f | 812 | |
396c147e | 813 | static void |
c8e9c167 | 814 | channel_pre_open(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 815 | { |
0c0738d5 | 816 | u_int limit = compat20 ? c->remote_window : packet_get_maxsize(); |
5260325f | 817 | |
7e7327a1 | 818 | if (c->istate == CHAN_INPUT_OPEN && |
0c0738d5 | 819 | limit > 0 && |
69d9d413 | 820 | buffer_len(&c->input) < limit && |
821 | buffer_check_alloc(&c->input, CHAN_RBUF)) | |
7e7327a1 | 822 | FD_SET(c->rfd, readset); |
823 | if (c->ostate == CHAN_OUTPUT_OPEN || | |
824 | c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { | |
825 | if (buffer_len(&c->output) > 0) { | |
826 | FD_SET(c->wfd, writeset); | |
827 | } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { | |
d2296ed7 | 828 | if (CHANNEL_EFD_OUTPUT_ACTIVE(c)) |
4e2e5cfd | 829 | debug2("channel %d: obuf_empty delayed efd %d/(%d)", |
830 | c->self, c->efd, buffer_len(&c->extended)); | |
d2296ed7 | 831 | else |
832 | chan_obuf_empty(c); | |
7e7327a1 | 833 | } |
834 | } | |
835 | /** XXX check close conditions, too */ | |
271f4a13 | 836 | if (compat20 && c->efd != -1 && |
837 | !(c->istate == CHAN_INPUT_CLOSED && c->ostate == CHAN_OUTPUT_CLOSED)) { | |
7e7327a1 | 838 | if (c->extended_usage == CHAN_EXTENDED_WRITE && |
839 | buffer_len(&c->extended) > 0) | |
840 | FD_SET(c->efd, writeset); | |
d2296ed7 | 841 | else if (!(c->flags & CHAN_EOF_SENT) && |
842 | c->extended_usage == CHAN_EXTENDED_READ && | |
7e7327a1 | 843 | buffer_len(&c->extended) < c->remote_window) |
844 | FD_SET(c->efd, readset); | |
845 | } | |
5e96b616 | 846 | /* XXX: What about efd? races? */ |
7e7327a1 | 847 | } |
848 | ||
ebb90778 | 849 | /* ARGSUSED */ |
396c147e | 850 | static void |
c8e9c167 | 851 | channel_pre_input_draining(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 852 | { |
853 | if (buffer_len(&c->input) == 0) { | |
854 | packet_start(SSH_MSG_CHANNEL_CLOSE); | |
855 | packet_put_int(c->remote_id); | |
856 | packet_send(); | |
857 | c->type = SSH_CHANNEL_CLOSED; | |
d7ac5f18 | 858 | debug2("channel %d: closing after input drain.", c->self); |
7368a6c8 | 859 | } |
860 | } | |
5260325f | 861 | |
ebb90778 | 862 | /* ARGSUSED */ |
396c147e | 863 | static void |
c8e9c167 | 864 | channel_pre_output_draining(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 865 | { |
866 | if (buffer_len(&c->output) == 0) | |
719fc62f | 867 | chan_mark_dead(c); |
6ae2364d | 868 | else |
7368a6c8 | 869 | FD_SET(c->sock, writeset); |
870 | } | |
5260325f | 871 | |
7368a6c8 | 872 | /* |
873 | * This is a special state for X11 authentication spoofing. An opened X11 | |
874 | * connection (when authentication spoofing is being done) remains in this | |
875 | * state until the first packet has been completely read. The authentication | |
876 | * data in that packet is then substituted by the real data if it matches the | |
877 | * fake data, and the channel is put into normal mode. | |
0b242b12 | 878 | * XXX All this happens at the client side. |
8e7895b8 | 879 | * Returns: 0 = need more data, -1 = wrong cookie, 1 = ok |
7368a6c8 | 880 | */ |
396c147e | 881 | static int |
8e7895b8 | 882 | x11_open_helper(Buffer *b) |
7368a6c8 | 883 | { |
1e3b8b07 | 884 | u_char *ucp; |
885 | u_int proto_len, data_len; | |
5260325f | 886 | |
7368a6c8 | 887 | /* Check if the fixed size part of the packet is in buffer. */ |
8e7895b8 | 888 | if (buffer_len(b) < 12) |
7368a6c8 | 889 | return 0; |
890 | ||
891 | /* Parse the lengths of variable-length fields. */ | |
20905a8e | 892 | ucp = buffer_ptr(b); |
7368a6c8 | 893 | if (ucp[0] == 0x42) { /* Byte order MSB first. */ |
894 | proto_len = 256 * ucp[6] + ucp[7]; | |
895 | data_len = 256 * ucp[8] + ucp[9]; | |
896 | } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */ | |
897 | proto_len = ucp[6] + 256 * ucp[7]; | |
898 | data_len = ucp[8] + 256 * ucp[9]; | |
899 | } else { | |
d7ac5f18 | 900 | debug2("Initial X11 packet contains bad byte order byte: 0x%x", |
184eed6a | 901 | ucp[0]); |
7368a6c8 | 902 | return -1; |
903 | } | |
5260325f | 904 | |
7368a6c8 | 905 | /* Check if the whole packet is in buffer. */ |
8e7895b8 | 906 | if (buffer_len(b) < |
7368a6c8 | 907 | 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3)) |
908 | return 0; | |
5260325f | 909 | |
7368a6c8 | 910 | /* Check if authentication protocol matches. */ |
911 | if (proto_len != strlen(x11_saved_proto) || | |
912 | memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) { | |
d7ac5f18 | 913 | debug2("X11 connection uses different authentication protocol."); |
7368a6c8 | 914 | return -1; |
915 | } | |
916 | /* Check if authentication data matches our fake data. */ | |
917 | if (data_len != x11_fake_data_len || | |
918 | memcmp(ucp + 12 + ((proto_len + 3) & ~3), | |
919 | x11_fake_data, x11_fake_data_len) != 0) { | |
d7ac5f18 | 920 | debug2("X11 auth data does not match fake data."); |
7368a6c8 | 921 | return -1; |
922 | } | |
923 | /* Check fake data length */ | |
924 | if (x11_fake_data_len != x11_saved_data_len) { | |
925 | error("X11 fake_data_len %d != saved_data_len %d", | |
926 | x11_fake_data_len, x11_saved_data_len); | |
927 | return -1; | |
928 | } | |
929 | /* | |
930 | * Received authentication protocol and data match | |
931 | * our fake data. Substitute the fake data with real | |
932 | * data. | |
933 | */ | |
934 | memcpy(ucp + 12 + ((proto_len + 3) & ~3), | |
935 | x11_saved_data, x11_saved_data_len); | |
936 | return 1; | |
937 | } | |
5260325f | 938 | |
396c147e | 939 | static void |
c8e9c167 | 940 | channel_pre_x11_open_13(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 941 | { |
8e7895b8 | 942 | int ret = x11_open_helper(&c->output); |
e1feb9bf | 943 | |
7368a6c8 | 944 | if (ret == 1) { |
945 | /* Start normal processing for the channel. */ | |
946 | c->type = SSH_CHANNEL_OPEN; | |
a8be9f80 | 947 | channel_pre_open_13(c, readset, writeset); |
7368a6c8 | 948 | } else if (ret == -1) { |
949 | /* | |
950 | * We have received an X11 connection that has bad | |
951 | * authentication information. | |
952 | */ | |
bbe88b6d | 953 | logit("X11 connection rejected because of wrong authentication."); |
7368a6c8 | 954 | buffer_clear(&c->input); |
955 | buffer_clear(&c->output); | |
489aa2e9 | 956 | channel_close_fd(&c->sock); |
7368a6c8 | 957 | c->sock = -1; |
958 | c->type = SSH_CHANNEL_CLOSED; | |
959 | packet_start(SSH_MSG_CHANNEL_CLOSE); | |
960 | packet_put_int(c->remote_id); | |
961 | packet_send(); | |
962 | } | |
963 | } | |
5260325f | 964 | |
396c147e | 965 | static void |
c8e9c167 | 966 | channel_pre_x11_open(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 967 | { |
8e7895b8 | 968 | int ret = x11_open_helper(&c->output); |
a5f82435 | 969 | |
970 | /* c->force_drain = 1; */ | |
971 | ||
7368a6c8 | 972 | if (ret == 1) { |
973 | c->type = SSH_CHANNEL_OPEN; | |
0c0738d5 | 974 | channel_pre_open(c, readset, writeset); |
7368a6c8 | 975 | } else if (ret == -1) { |
bbe88b6d | 976 | logit("X11 connection rejected because of wrong authentication."); |
d7ac5f18 | 977 | debug2("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate); |
8341f420 | 978 | chan_read_failed(c); |
979 | buffer_clear(&c->input); | |
980 | chan_ibuf_empty(c); | |
981 | buffer_clear(&c->output); | |
982 | /* for proto v1, the peer will send an IEOF */ | |
983 | if (compat20) | |
984 | chan_write_failed(c); | |
985 | else | |
986 | c->type = SSH_CHANNEL_OPEN; | |
d7ac5f18 | 987 | debug2("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate); |
7368a6c8 | 988 | } |
989 | } | |
5260325f | 990 | |
a858eae9 | 991 | static void |
992 | channel_pre_mux_client(Channel *c, fd_set *readset, fd_set *writeset) | |
993 | { | |
994 | if (c->istate == CHAN_INPUT_OPEN && | |
995 | buffer_check_alloc(&c->input, CHAN_RBUF)) | |
996 | FD_SET(c->rfd, readset); | |
997 | if (c->istate == CHAN_INPUT_WAIT_DRAIN) { | |
998 | /* clear buffer immediately (discard any partial packet) */ | |
999 | buffer_clear(&c->input); | |
1000 | chan_ibuf_empty(c); | |
1001 | /* Start output drain. XXX just kill chan? */ | |
1002 | chan_rcvd_oclose(c); | |
1003 | } | |
1004 | if (c->ostate == CHAN_OUTPUT_OPEN || | |
1005 | c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { | |
1006 | if (buffer_len(&c->output) > 0) | |
1007 | FD_SET(c->wfd, writeset); | |
1008 | else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) | |
1009 | chan_obuf_empty(c); | |
1010 | } | |
1011 | } | |
1012 | ||
28b9cb4d | 1013 | /* try to decode a socks4 header */ |
ebb90778 | 1014 | /* ARGSUSED */ |
396c147e | 1015 | static int |
c8e9c167 | 1016 | channel_decode_socks4(Channel *c, fd_set *readset, fd_set *writeset) |
0490e609 | 1017 | { |
661e45a0 | 1018 | char *p, *host; |
4866a6d6 | 1019 | u_int len, have, i, found, need; |
184eed6a | 1020 | char username[256]; |
0490e609 | 1021 | struct { |
1022 | u_int8_t version; | |
1023 | u_int8_t command; | |
1024 | u_int16_t dest_port; | |
28b9cb4d | 1025 | struct in_addr dest_addr; |
0490e609 | 1026 | } s4_req, s4_rsp; |
1027 | ||
28b9cb4d | 1028 | debug2("channel %d: decode socks4", c->self); |
53b8fe68 | 1029 | |
1030 | have = buffer_len(&c->input); | |
1031 | len = sizeof(s4_req); | |
1032 | if (have < len) | |
1033 | return 0; | |
1034 | p = buffer_ptr(&c->input); | |
4866a6d6 | 1035 | |
1036 | need = 1; | |
1037 | /* SOCKS4A uses an invalid IP address 0.0.0.x */ | |
1038 | if (p[4] == 0 && p[5] == 0 && p[6] == 0 && p[7] != 0) { | |
1039 | debug2("channel %d: socks4a request", c->self); | |
1040 | /* ... and needs an extra string (the hostname) */ | |
1041 | need = 2; | |
1042 | } | |
1043 | /* Check for terminating NUL on the string(s) */ | |
53b8fe68 | 1044 | for (found = 0, i = len; i < have; i++) { |
1045 | if (p[i] == '\0') { | |
4866a6d6 | 1046 | found++; |
1047 | if (found == need) | |
1048 | break; | |
53b8fe68 | 1049 | } |
1050 | if (i > 1024) { | |
1051 | /* the peer is probably sending garbage */ | |
1052 | debug("channel %d: decode socks4: too long", | |
1053 | c->self); | |
1054 | return -1; | |
1055 | } | |
1056 | } | |
4866a6d6 | 1057 | if (found < need) |
53b8fe68 | 1058 | return 0; |
0490e609 | 1059 | buffer_get(&c->input, (char *)&s4_req.version, 1); |
1060 | buffer_get(&c->input, (char *)&s4_req.command, 1); | |
1061 | buffer_get(&c->input, (char *)&s4_req.dest_port, 2); | |
28b9cb4d | 1062 | buffer_get(&c->input, (char *)&s4_req.dest_addr, 4); |
53b8fe68 | 1063 | have = buffer_len(&c->input); |
0490e609 | 1064 | p = buffer_ptr(&c->input); |
1065 | len = strlen(p); | |
6683b40f | 1066 | debug2("channel %d: decode socks4: user %s/%d", c->self, p, len); |
4866a6d6 | 1067 | len++; /* trailing '\0' */ |
0490e609 | 1068 | if (len > have) |
28b9cb4d | 1069 | fatal("channel %d: decode socks4: len %d > have %d", |
0490e609 | 1070 | c->self, len, have); |
1071 | strlcpy(username, p, sizeof(username)); | |
1072 | buffer_consume(&c->input, len); | |
0490e609 | 1073 | |
1338ba77 | 1074 | if (c->path != NULL) { |
1075 | xfree(c->path); | |
1076 | c->path = NULL; | |
1077 | } | |
4866a6d6 | 1078 | if (need == 1) { /* SOCKS4: one string */ |
1079 | host = inet_ntoa(s4_req.dest_addr); | |
1338ba77 | 1080 | c->path = xstrdup(host); |
4866a6d6 | 1081 | } else { /* SOCKS4A: two strings */ |
1082 | have = buffer_len(&c->input); | |
1083 | p = buffer_ptr(&c->input); | |
1084 | len = strlen(p); | |
1085 | debug2("channel %d: decode socks4a: host %s/%d", | |
1086 | c->self, p, len); | |
1087 | len++; /* trailing '\0' */ | |
1088 | if (len > have) | |
1089 | fatal("channel %d: decode socks4a: len %d > have %d", | |
1090 | c->self, len, have); | |
1338ba77 | 1091 | if (len > NI_MAXHOST) { |
4866a6d6 | 1092 | error("channel %d: hostname \"%.100s\" too long", |
1093 | c->self, p); | |
1094 | return -1; | |
1095 | } | |
1338ba77 | 1096 | c->path = xstrdup(p); |
4866a6d6 | 1097 | buffer_consume(&c->input, len); |
1098 | } | |
0490e609 | 1099 | c->host_port = ntohs(s4_req.dest_port); |
184eed6a | 1100 | |
d7ac5f18 | 1101 | debug2("channel %d: dynamic request: socks4 host %s port %u command %u", |
4866a6d6 | 1102 | c->self, c->path, c->host_port, s4_req.command); |
0490e609 | 1103 | |
28b9cb4d | 1104 | if (s4_req.command != 1) { |
4866a6d6 | 1105 | debug("channel %d: cannot handle: %s cn %d", |
1106 | c->self, need == 1 ? "SOCKS4" : "SOCKS4A", s4_req.command); | |
28b9cb4d | 1107 | return -1; |
0490e609 | 1108 | } |
28b9cb4d | 1109 | s4_rsp.version = 0; /* vn: 0 for reply */ |
1110 | s4_rsp.command = 90; /* cd: req granted */ | |
0490e609 | 1111 | s4_rsp.dest_port = 0; /* ignored */ |
28b9cb4d | 1112 | s4_rsp.dest_addr.s_addr = INADDR_ANY; /* ignored */ |
15dd2c4f | 1113 | buffer_append(&c->output, &s4_rsp, sizeof(s4_rsp)); |
28b9cb4d | 1114 | return 1; |
0490e609 | 1115 | } |
1116 | ||
f49658f5 | 1117 | /* try to decode a socks5 header */ |
1118 | #define SSH_SOCKS5_AUTHDONE 0x1000 | |
1119 | #define SSH_SOCKS5_NOAUTH 0x00 | |
1120 | #define SSH_SOCKS5_IPV4 0x01 | |
1121 | #define SSH_SOCKS5_DOMAIN 0x03 | |
1122 | #define SSH_SOCKS5_IPV6 0x04 | |
1123 | #define SSH_SOCKS5_CONNECT 0x01 | |
1124 | #define SSH_SOCKS5_SUCCESS 0x00 | |
1125 | ||
ebb90778 | 1126 | /* ARGSUSED */ |
f49658f5 | 1127 | static int |
c8e9c167 | 1128 | channel_decode_socks5(Channel *c, fd_set *readset, fd_set *writeset) |
f49658f5 | 1129 | { |
1130 | struct { | |
1131 | u_int8_t version; | |
1132 | u_int8_t command; | |
1133 | u_int8_t reserved; | |
1134 | u_int8_t atyp; | |
1135 | } s5_req, s5_rsp; | |
1136 | u_int16_t dest_port; | |
1338ba77 | 1137 | u_char *p, dest_addr[255+1], ntop[INET6_ADDRSTRLEN]; |
a217e418 | 1138 | u_int have, need, i, found, nmethods, addrlen, af; |
f49658f5 | 1139 | |
1140 | debug2("channel %d: decode socks5", c->self); | |
1141 | p = buffer_ptr(&c->input); | |
1142 | if (p[0] != 0x05) | |
1143 | return -1; | |
1144 | have = buffer_len(&c->input); | |
1145 | if (!(c->flags & SSH_SOCKS5_AUTHDONE)) { | |
1146 | /* format: ver | nmethods | methods */ | |
aff51935 | 1147 | if (have < 2) |
f49658f5 | 1148 | return 0; |
1149 | nmethods = p[1]; | |
1150 | if (have < nmethods + 2) | |
1151 | return 0; | |
1152 | /* look for method: "NO AUTHENTICATION REQUIRED" */ | |
4f6e2ba9 | 1153 | for (found = 0, i = 2; i < nmethods + 2; i++) { |
d4f40d92 | 1154 | if (p[i] == SSH_SOCKS5_NOAUTH) { |
f49658f5 | 1155 | found = 1; |
1156 | break; | |
1157 | } | |
1158 | } | |
1159 | if (!found) { | |
1160 | debug("channel %d: method SSH_SOCKS5_NOAUTH not found", | |
1161 | c->self); | |
1162 | return -1; | |
1163 | } | |
1164 | buffer_consume(&c->input, nmethods + 2); | |
1165 | buffer_put_char(&c->output, 0x05); /* version */ | |
1166 | buffer_put_char(&c->output, SSH_SOCKS5_NOAUTH); /* method */ | |
1167 | FD_SET(c->sock, writeset); | |
1168 | c->flags |= SSH_SOCKS5_AUTHDONE; | |
1169 | debug2("channel %d: socks5 auth done", c->self); | |
1170 | return 0; /* need more */ | |
1171 | } | |
1172 | debug2("channel %d: socks5 post auth", c->self); | |
1173 | if (have < sizeof(s5_req)+1) | |
1174 | return 0; /* need more */ | |
5b5f6af7 | 1175 | memcpy(&s5_req, p, sizeof(s5_req)); |
f49658f5 | 1176 | if (s5_req.version != 0x05 || |
1177 | s5_req.command != SSH_SOCKS5_CONNECT || | |
1178 | s5_req.reserved != 0x00) { | |
d7ac5f18 | 1179 | debug2("channel %d: only socks5 connect supported", c->self); |
f49658f5 | 1180 | return -1; |
1181 | } | |
f8cc7664 | 1182 | switch (s5_req.atyp){ |
f49658f5 | 1183 | case SSH_SOCKS5_IPV4: |
1184 | addrlen = 4; | |
1185 | af = AF_INET; | |
1186 | break; | |
1187 | case SSH_SOCKS5_DOMAIN: | |
1188 | addrlen = p[sizeof(s5_req)]; | |
1189 | af = -1; | |
1190 | break; | |
1191 | case SSH_SOCKS5_IPV6: | |
1192 | addrlen = 16; | |
1193 | af = AF_INET6; | |
1194 | break; | |
1195 | default: | |
d7ac5f18 | 1196 | debug2("channel %d: bad socks5 atyp %d", c->self, s5_req.atyp); |
f49658f5 | 1197 | return -1; |
1198 | } | |
a217e418 | 1199 | need = sizeof(s5_req) + addrlen + 2; |
1200 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) | |
1201 | need++; | |
1202 | if (have < need) | |
f49658f5 | 1203 | return 0; |
1204 | buffer_consume(&c->input, sizeof(s5_req)); | |
1205 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) | |
1206 | buffer_consume(&c->input, 1); /* host string length */ | |
1207 | buffer_get(&c->input, (char *)&dest_addr, addrlen); | |
1208 | buffer_get(&c->input, (char *)&dest_port, 2); | |
1209 | dest_addr[addrlen] = '\0'; | |
1338ba77 | 1210 | if (c->path != NULL) { |
1211 | xfree(c->path); | |
1212 | c->path = NULL; | |
1213 | } | |
1214 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) { | |
920706fd | 1215 | if (addrlen >= NI_MAXHOST) { |
1338ba77 | 1216 | error("channel %d: dynamic request: socks5 hostname " |
1217 | "\"%.100s\" too long", c->self, dest_addr); | |
1218 | return -1; | |
1219 | } | |
1220 | c->path = xstrdup(dest_addr); | |
1221 | } else { | |
1222 | if (inet_ntop(af, dest_addr, ntop, sizeof(ntop)) == NULL) | |
1223 | return -1; | |
1224 | c->path = xstrdup(ntop); | |
1225 | } | |
f49658f5 | 1226 | c->host_port = ntohs(dest_port); |
b6453d99 | 1227 | |
d7ac5f18 | 1228 | debug2("channel %d: dynamic request: socks5 host %s port %u command %u", |
f49658f5 | 1229 | c->self, c->path, c->host_port, s5_req.command); |
1230 | ||
1231 | s5_rsp.version = 0x05; | |
1232 | s5_rsp.command = SSH_SOCKS5_SUCCESS; | |
1233 | s5_rsp.reserved = 0; /* ignored */ | |
1234 | s5_rsp.atyp = SSH_SOCKS5_IPV4; | |
1235 | ((struct in_addr *)&dest_addr)->s_addr = INADDR_ANY; | |
1236 | dest_port = 0; /* ignored */ | |
1237 | ||
15dd2c4f | 1238 | buffer_append(&c->output, &s5_rsp, sizeof(s5_rsp)); |
1239 | buffer_append(&c->output, &dest_addr, sizeof(struct in_addr)); | |
1240 | buffer_append(&c->output, &dest_port, sizeof(dest_port)); | |
f49658f5 | 1241 | return 1; |
1242 | } | |
1243 | ||
e6780883 | 1244 | Channel * |
a858eae9 | 1245 | channel_connect_stdio_fwd(const char *host_to_connect, u_short port_to_connect, |
1246 | int in, int out) | |
e6780883 | 1247 | { |
1248 | Channel *c; | |
e6780883 | 1249 | |
1250 | debug("channel_connect_stdio_fwd %s:%d", host_to_connect, | |
1251 | port_to_connect); | |
1252 | ||
e6780883 | 1253 | c = channel_new("stdio-forward", SSH_CHANNEL_OPENING, in, out, |
1254 | -1, CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, | |
1255 | 0, "stdio-forward", /*nonblock*/0); | |
1256 | ||
1257 | c->path = xstrdup(host_to_connect); | |
1258 | c->host_port = port_to_connect; | |
1259 | c->listening_port = 0; | |
1260 | c->force_drain = 1; | |
1261 | ||
1262 | channel_register_fds(c, in, out, -1, 0, 1, 0); | |
1263 | port_open_helper(c, "direct-tcpip"); | |
1264 | ||
1265 | return c; | |
1266 | } | |
1267 | ||
28b9cb4d | 1268 | /* dynamic port forwarding */ |
396c147e | 1269 | static void |
c8e9c167 | 1270 | channel_pre_dynamic(Channel *c, fd_set *readset, fd_set *writeset) |
28b9cb4d | 1271 | { |
1272 | u_char *p; | |
2ceb8101 | 1273 | u_int have; |
1274 | int ret; | |
28b9cb4d | 1275 | |
1276 | have = buffer_len(&c->input); | |
28b9cb4d | 1277 | debug2("channel %d: pre_dynamic: have %d", c->self, have); |
070adba2 | 1278 | /* buffer_dump(&c->input); */ |
28b9cb4d | 1279 | /* check if the fixed size part of the packet is in buffer. */ |
f49658f5 | 1280 | if (have < 3) { |
28b9cb4d | 1281 | /* need more */ |
1282 | FD_SET(c->sock, readset); | |
1283 | return; | |
1284 | } | |
1285 | /* try to guess the protocol */ | |
1286 | p = buffer_ptr(&c->input); | |
1287 | switch (p[0]) { | |
6683b40f | 1288 | case 0x04: |
1289 | ret = channel_decode_socks4(c, readset, writeset); | |
1290 | break; | |
f49658f5 | 1291 | case 0x05: |
1292 | ret = channel_decode_socks5(c, readset, writeset); | |
1293 | break; | |
28b9cb4d | 1294 | default: |
1295 | ret = -1; | |
1296 | break; | |
1297 | } | |
1298 | if (ret < 0) { | |
719fc62f | 1299 | chan_mark_dead(c); |
28b9cb4d | 1300 | } else if (ret == 0) { |
1301 | debug2("channel %d: pre_dynamic: need more", c->self); | |
1302 | /* need more */ | |
1303 | FD_SET(c->sock, readset); | |
1304 | } else { | |
1305 | /* switch to the next state */ | |
1306 | c->type = SSH_CHANNEL_OPENING; | |
1307 | port_open_helper(c, "direct-tcpip"); | |
1308 | } | |
1309 | } | |
0490e609 | 1310 | |
7368a6c8 | 1311 | /* This is our fake X11 server socket. */ |
ebb90778 | 1312 | /* ARGSUSED */ |
396c147e | 1313 | static void |
c8e9c167 | 1314 | channel_post_x11_listener(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1315 | { |
719fc62f | 1316 | Channel *nc; |
9fb764ab | 1317 | struct sockaddr_storage addr; |
bcc0381e | 1318 | int newsock; |
7368a6c8 | 1319 | socklen_t addrlen; |
865ac82e | 1320 | char buf[16384], *remote_ipaddr; |
0b242b12 | 1321 | int remote_port; |
7368a6c8 | 1322 | |
1323 | if (FD_ISSET(c->sock, readset)) { | |
1324 | debug("X11 connection requested."); | |
1325 | addrlen = sizeof(addr); | |
9fb764ab | 1326 | newsock = accept(c->sock, (struct sockaddr *)&addr, &addrlen); |
ac151b18 | 1327 | if (c->single_connection) { |
d7ac5f18 | 1328 | debug2("single_connection: closing X11 listener."); |
ac151b18 | 1329 | channel_close_fd(&c->sock); |
1330 | chan_mark_dead(c); | |
1331 | } | |
7368a6c8 | 1332 | if (newsock < 0) { |
1333 | error("accept: %.100s", strerror(errno)); | |
1334 | return; | |
5260325f | 1335 | } |
bcc0381e | 1336 | set_nodelay(newsock); |
865ac82e | 1337 | remote_ipaddr = get_peer_ipaddr(newsock); |
0b242b12 | 1338 | remote_port = get_peer_port(newsock); |
7368a6c8 | 1339 | snprintf(buf, sizeof buf, "X11 connection from %.200s port %d", |
865ac82e | 1340 | remote_ipaddr, remote_port); |
0b242b12 | 1341 | |
719fc62f | 1342 | nc = channel_new("accepted x11 socket", |
0b242b12 | 1343 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
0d942eff | 1344 | c->local_window_max, c->local_maxpacket, 0, buf, 1); |
0b242b12 | 1345 | if (compat20) { |
1346 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1347 | packet_put_cstring("x11"); | |
719fc62f | 1348 | packet_put_int(nc->self); |
ac151b18 | 1349 | packet_put_int(nc->local_window_max); |
1350 | packet_put_int(nc->local_maxpacket); | |
865ac82e | 1351 | /* originator ipaddr and port */ |
1352 | packet_put_cstring(remote_ipaddr); | |
d0c832f3 | 1353 | if (datafellows & SSH_BUG_X11FWD) { |
d7ac5f18 | 1354 | debug2("ssh2 x11 bug compat mode"); |
d0c832f3 | 1355 | } else { |
1356 | packet_put_int(remote_port); | |
1357 | } | |
0b242b12 | 1358 | packet_send(); |
1359 | } else { | |
1360 | packet_start(SSH_SMSG_X11_OPEN); | |
719fc62f | 1361 | packet_put_int(nc->self); |
8e7895b8 | 1362 | if (packet_get_protocol_flags() & |
1363 | SSH_PROTOFLAG_HOST_IN_FWD_OPEN) | |
449c5ba5 | 1364 | packet_put_cstring(buf); |
0b242b12 | 1365 | packet_send(); |
1366 | } | |
865ac82e | 1367 | xfree(remote_ipaddr); |
8efc0c15 | 1368 | } |
8efc0c15 | 1369 | } |
1370 | ||
396c147e | 1371 | static void |
0490e609 | 1372 | port_open_helper(Channel *c, char *rtype) |
1373 | { | |
1374 | int direct; | |
1375 | char buf[1024]; | |
1376 | char *remote_ipaddr = get_peer_ipaddr(c->sock); | |
29798ed0 | 1377 | int remote_port = get_peer_port(c->sock); |
0490e609 | 1378 | |
1379 | direct = (strcmp(rtype, "direct-tcpip") == 0); | |
1380 | ||
1381 | snprintf(buf, sizeof buf, | |
1382 | "%s: listening port %d for %.100s port %d, " | |
1383 | "connect from %.200s port %d", | |
1384 | rtype, c->listening_port, c->path, c->host_port, | |
1385 | remote_ipaddr, remote_port); | |
1386 | ||
1387 | xfree(c->remote_name); | |
1388 | c->remote_name = xstrdup(buf); | |
1389 | ||
1390 | if (compat20) { | |
1391 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1392 | packet_put_cstring(rtype); | |
1393 | packet_put_int(c->self); | |
1394 | packet_put_int(c->local_window_max); | |
1395 | packet_put_int(c->local_maxpacket); | |
1396 | if (direct) { | |
1397 | /* target host, port */ | |
1398 | packet_put_cstring(c->path); | |
1399 | packet_put_int(c->host_port); | |
1400 | } else { | |
1401 | /* listen address, port */ | |
1402 | packet_put_cstring(c->path); | |
1403 | packet_put_int(c->listening_port); | |
1404 | } | |
1405 | /* originator host and port */ | |
1406 | packet_put_cstring(remote_ipaddr); | |
29798ed0 | 1407 | packet_put_int((u_int)remote_port); |
0490e609 | 1408 | packet_send(); |
1409 | } else { | |
1410 | packet_start(SSH_MSG_PORT_OPEN); | |
1411 | packet_put_int(c->self); | |
1412 | packet_put_cstring(c->path); | |
1413 | packet_put_int(c->host_port); | |
8e7895b8 | 1414 | if (packet_get_protocol_flags() & |
1415 | SSH_PROTOFLAG_HOST_IN_FWD_OPEN) | |
0490e609 | 1416 | packet_put_cstring(c->remote_name); |
1417 | packet_send(); | |
1418 | } | |
1419 | xfree(remote_ipaddr); | |
1420 | } | |
1421 | ||
442aee3a | 1422 | static void |
1423 | channel_set_reuseaddr(int fd) | |
1424 | { | |
1425 | int on = 1; | |
1426 | ||
1427 | /* | |
1428 | * Set socket options. | |
1429 | * Allow local port reuse in TIME_WAIT. | |
1430 | */ | |
1431 | if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1) | |
1432 | error("setsockopt SO_REUSEADDR fd %d: %s", fd, strerror(errno)); | |
1433 | } | |
1434 | ||
aa3378df | 1435 | /* |
7368a6c8 | 1436 | * This socket is listening for connections to a forwarded TCP/IP port. |
aa3378df | 1437 | */ |
ebb90778 | 1438 | /* ARGSUSED */ |
396c147e | 1439 | static void |
c8e9c167 | 1440 | channel_post_port_listener(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1441 | { |
0490e609 | 1442 | Channel *nc; |
9fb764ab | 1443 | struct sockaddr_storage addr; |
719fc62f | 1444 | int newsock, nextstate; |
7368a6c8 | 1445 | socklen_t addrlen; |
0490e609 | 1446 | char *rtype; |
fa08c86b | 1447 | |
7368a6c8 | 1448 | if (FD_ISSET(c->sock, readset)) { |
1449 | debug("Connection to port %d forwarding " | |
1450 | "to %.100s port %d requested.", | |
1451 | c->listening_port, c->path, c->host_port); | |
0490e609 | 1452 | |
639cb8ab | 1453 | if (c->type == SSH_CHANNEL_RPORT_LISTENER) { |
1454 | nextstate = SSH_CHANNEL_OPENING; | |
1455 | rtype = "forwarded-tcpip"; | |
1456 | } else { | |
1457 | if (c->host_port == 0) { | |
1458 | nextstate = SSH_CHANNEL_DYNAMIC; | |
f3964cb9 | 1459 | rtype = "dynamic-tcpip"; |
639cb8ab | 1460 | } else { |
1461 | nextstate = SSH_CHANNEL_OPENING; | |
1462 | rtype = "direct-tcpip"; | |
1463 | } | |
1464 | } | |
0490e609 | 1465 | |
7368a6c8 | 1466 | addrlen = sizeof(addr); |
9fb764ab | 1467 | newsock = accept(c->sock, (struct sockaddr *)&addr, &addrlen); |
7368a6c8 | 1468 | if (newsock < 0) { |
1469 | error("accept: %.100s", strerror(errno)); | |
1470 | return; | |
1471 | } | |
811a6342 | 1472 | set_nodelay(newsock); |
0d942eff | 1473 | nc = channel_new(rtype, nextstate, newsock, newsock, -1, |
1474 | c->local_window_max, c->local_maxpacket, 0, rtype, 1); | |
0490e609 | 1475 | nc->listening_port = c->listening_port; |
1476 | nc->host_port = c->host_port; | |
1338ba77 | 1477 | if (c->path != NULL) |
1478 | nc->path = xstrdup(c->path); | |
0490e609 | 1479 | |
7501ed0d | 1480 | if (nextstate != SSH_CHANNEL_DYNAMIC) |
0490e609 | 1481 | port_open_helper(nc, rtype); |
7368a6c8 | 1482 | } |
1483 | } | |
8efc0c15 | 1484 | |
7368a6c8 | 1485 | /* |
1486 | * This is the authentication agent socket listening for connections from | |
1487 | * clients. | |
1488 | */ | |
ebb90778 | 1489 | /* ARGSUSED */ |
396c147e | 1490 | static void |
c8e9c167 | 1491 | channel_post_auth_listener(Channel *c, fd_set *readset, fd_set *writeset) |
8efc0c15 | 1492 | { |
719fc62f | 1493 | Channel *nc; |
1494 | int newsock; | |
9fb764ab | 1495 | struct sockaddr_storage addr; |
48e671d5 | 1496 | socklen_t addrlen; |
5260325f | 1497 | |
7368a6c8 | 1498 | if (FD_ISSET(c->sock, readset)) { |
1499 | addrlen = sizeof(addr); | |
9fb764ab | 1500 | newsock = accept(c->sock, (struct sockaddr *)&addr, &addrlen); |
7368a6c8 | 1501 | if (newsock < 0) { |
1502 | error("accept from auth socket: %.100s", strerror(errno)); | |
1503 | return; | |
1504 | } | |
719fc62f | 1505 | nc = channel_new("accepted auth socket", |
fa08c86b | 1506 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
1507 | c->local_window_max, c->local_maxpacket, | |
0d942eff | 1508 | 0, "accepted auth socket", 1); |
fa08c86b | 1509 | if (compat20) { |
1510 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1511 | packet_put_cstring("auth-agent@openssh.com"); | |
719fc62f | 1512 | packet_put_int(nc->self); |
fa08c86b | 1513 | packet_put_int(c->local_window_max); |
1514 | packet_put_int(c->local_maxpacket); | |
1515 | } else { | |
1516 | packet_start(SSH_SMSG_AGENT_OPEN); | |
719fc62f | 1517 | packet_put_int(nc->self); |
fa08c86b | 1518 | } |
7368a6c8 | 1519 | packet_send(); |
1520 | } | |
1521 | } | |
5260325f | 1522 | |
ebb90778 | 1523 | /* ARGSUSED */ |
396c147e | 1524 | static void |
c8e9c167 | 1525 | channel_post_connecting(Channel *c, fd_set *readset, fd_set *writeset) |
97fb6912 | 1526 | { |
e07e21ad | 1527 | int err = 0, sock; |
8ab2cb35 | 1528 | socklen_t sz = sizeof(err); |
d18e0850 | 1529 | |
97fb6912 | 1530 | if (FD_ISSET(c->sock, writeset)) { |
db518d9b | 1531 | if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, &err, &sz) < 0) { |
d18e0850 | 1532 | err = errno; |
1533 | error("getsockopt SO_ERROR failed"); | |
1534 | } | |
1535 | if (err == 0) { | |
e07e21ad | 1536 | debug("channel %d: connected to %s port %d", |
1537 | c->self, c->connect_ctx.host, c->connect_ctx.port); | |
1538 | channel_connect_ctx_free(&c->connect_ctx); | |
d18e0850 | 1539 | c->type = SSH_CHANNEL_OPEN; |
1540 | if (compat20) { | |
1541 | packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1542 | packet_put_int(c->remote_id); | |
1543 | packet_put_int(c->self); | |
1544 | packet_put_int(c->local_window); | |
1545 | packet_put_int(c->local_maxpacket); | |
1546 | } else { | |
1547 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1548 | packet_put_int(c->remote_id); | |
1549 | packet_put_int(c->self); | |
1550 | } | |
97fb6912 | 1551 | } else { |
e07e21ad | 1552 | debug("channel %d: connection failed: %s", |
d18e0850 | 1553 | c->self, strerror(err)); |
e07e21ad | 1554 | /* Try next address, if any */ |
1555 | if ((sock = connect_next(&c->connect_ctx)) > 0) { | |
1556 | close(c->sock); | |
1557 | c->sock = c->rfd = c->wfd = sock; | |
1558 | channel_max_fd = channel_find_maxfd(); | |
1559 | return; | |
1560 | } | |
1561 | /* Exhausted all addresses */ | |
1562 | error("connect_to %.100s port %d: failed.", | |
1563 | c->connect_ctx.host, c->connect_ctx.port); | |
1564 | channel_connect_ctx_free(&c->connect_ctx); | |
d18e0850 | 1565 | if (compat20) { |
1566 | packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); | |
1567 | packet_put_int(c->remote_id); | |
1568 | packet_put_int(SSH2_OPEN_CONNECT_FAILED); | |
1569 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { | |
1570 | packet_put_cstring(strerror(err)); | |
1571 | packet_put_cstring(""); | |
1572 | } | |
97fb6912 | 1573 | } else { |
d18e0850 | 1574 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
1575 | packet_put_int(c->remote_id); | |
97fb6912 | 1576 | } |
d18e0850 | 1577 | chan_mark_dead(c); |
97fb6912 | 1578 | } |
d18e0850 | 1579 | packet_send(); |
97fb6912 | 1580 | } |
1581 | } | |
1582 | ||
ebb90778 | 1583 | /* ARGSUSED */ |
396c147e | 1584 | static int |
c8e9c167 | 1585 | channel_handle_rfd(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1586 | { |
fa1d7d85 | 1587 | char buf[CHAN_RBUF]; |
bd6a1355 | 1588 | int len, force; |
7368a6c8 | 1589 | |
bd6a1355 | 1590 | force = c->isatty && c->detach_close && c->istate != CHAN_INPUT_CLOSED; |
1591 | if (c->rfd != -1 && (force || FD_ISSET(c->rfd, readset))) { | |
ea8c44d9 | 1592 | errno = 0; |
7368a6c8 | 1593 | len = read(c->rfd, buf, sizeof(buf)); |
5a0c8771 | 1594 | if (len < 0 && (errno == EINTR || |
1595 | ((errno == EAGAIN || errno == EWOULDBLOCK) && !force))) | |
0fbe8c74 | 1596 | return 1; |
ea8c44d9 | 1597 | #ifndef PTY_ZEROREAD |
7368a6c8 | 1598 | if (len <= 0) { |
ea8c44d9 | 1599 | #else |
9c04d67d | 1600 | if ((!c->isatty && len <= 0) || |
1601 | (c->isatty && (len < 0 || (len == 0 && errno != 0)))) { | |
ea8c44d9 | 1602 | #endif |
d7ac5f18 | 1603 | debug2("channel %d: read<=0 rfd %d len %d", |
7368a6c8 | 1604 | c->self, c->rfd, len); |
28b9cb4d | 1605 | if (c->type != SSH_CHANNEL_OPEN) { |
d7ac5f18 | 1606 | debug2("channel %d: not open", c->self); |
719fc62f | 1607 | chan_mark_dead(c); |
0490e609 | 1608 | return -1; |
28b9cb4d | 1609 | } else if (compat13) { |
9c50edcf | 1610 | buffer_clear(&c->output); |
7368a6c8 | 1611 | c->type = SSH_CHANNEL_INPUT_DRAINING; |
d7ac5f18 | 1612 | debug2("channel %d: input draining.", c->self); |
7368a6c8 | 1613 | } else { |
1614 | chan_read_failed(c); | |
5260325f | 1615 | } |
7368a6c8 | 1616 | return -1; |
1617 | } | |
6aacefa7 | 1618 | if (c->input_filter != NULL) { |
2e73a022 | 1619 | if (c->input_filter(c, buf, len) == -1) { |
d7ac5f18 | 1620 | debug2("channel %d: filter stops", c->self); |
2e73a022 | 1621 | chan_read_failed(c); |
1622 | } | |
d20f3c9e | 1623 | } else if (c->datagram) { |
1624 | buffer_put_string(&c->input, buf, len); | |
2e73a022 | 1625 | } else { |
1626 | buffer_append(&c->input, buf, len); | |
1627 | } | |
7368a6c8 | 1628 | } |
1629 | return 1; | |
1630 | } | |
a7137f6b | 1631 | |
ebb90778 | 1632 | /* ARGSUSED */ |
396c147e | 1633 | static int |
c8e9c167 | 1634 | channel_handle_wfd(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1635 | { |
95ce5599 | 1636 | struct termios tio; |
c1c6a032 | 1637 | u_char *data = NULL, *buf; |
780a9951 | 1638 | u_int dlen; |
7368a6c8 | 1639 | int len; |
1640 | ||
1641 | /* Send buffered output data to the socket. */ | |
6fd8622b | 1642 | if (c->wfd != -1 && |
7368a6c8 | 1643 | FD_ISSET(c->wfd, writeset) && |
1644 | buffer_len(&c->output) > 0) { | |
c1c6a032 | 1645 | if (c->output_filter != NULL) { |
1646 | if ((buf = c->output_filter(c, &data, &dlen)) == NULL) { | |
1647 | debug2("channel %d: filter stops", c->self); | |
d7b37427 | 1648 | if (c->type != SSH_CHANNEL_OPEN) |
1649 | chan_mark_dead(c); | |
1650 | else | |
1651 | chan_write_failed(c); | |
1652 | return -1; | |
c1c6a032 | 1653 | } |
1654 | } else if (c->datagram) { | |
1655 | buf = data = buffer_get_string(&c->output, &dlen); | |
1656 | } else { | |
1657 | buf = data = buffer_ptr(&c->output); | |
1658 | dlen = buffer_len(&c->output); | |
1659 | } | |
1660 | ||
d20f3c9e | 1661 | if (c->datagram) { |
d20f3c9e | 1662 | /* ignore truncated writes, datagrams might get lost */ |
1663 | c->local_consumed += dlen + 4; | |
c1c6a032 | 1664 | len = write(c->wfd, buf, dlen); |
d20f3c9e | 1665 | xfree(data); |
5a0c8771 | 1666 | if (len < 0 && (errno == EINTR || errno == EAGAIN || |
1667 | errno == EWOULDBLOCK)) | |
d20f3c9e | 1668 | return 1; |
1669 | if (len <= 0) { | |
1670 | if (c->type != SSH_CHANNEL_OPEN) | |
1671 | chan_mark_dead(c); | |
1672 | else | |
1673 | chan_write_failed(c); | |
1674 | return -1; | |
1675 | } | |
1676 | return 1; | |
1677 | } | |
64c0ce80 | 1678 | #ifdef _AIX |
aff51935 | 1679 | /* XXX: Later AIX versions can't push as much data to tty */ |
7fbb4189 | 1680 | if (compat20 && c->wfd_isatty) |
1681 | dlen = MIN(dlen, 8*1024); | |
64c0ce80 | 1682 | #endif |
c1c6a032 | 1683 | |
1684 | len = write(c->wfd, buf, dlen); | |
5a0c8771 | 1685 | if (len < 0 && |
1686 | (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK)) | |
0fbe8c74 | 1687 | return 1; |
7368a6c8 | 1688 | if (len <= 0) { |
28b9cb4d | 1689 | if (c->type != SSH_CHANNEL_OPEN) { |
d7ac5f18 | 1690 | debug2("channel %d: not open", c->self); |
719fc62f | 1691 | chan_mark_dead(c); |
28b9cb4d | 1692 | return -1; |
1693 | } else if (compat13) { | |
9c50edcf | 1694 | buffer_clear(&c->output); |
d7ac5f18 | 1695 | debug2("channel %d: input draining.", c->self); |
7368a6c8 | 1696 | c->type = SSH_CHANNEL_INPUT_DRAINING; |
1697 | } else { | |
1698 | chan_write_failed(c); | |
5260325f | 1699 | } |
7368a6c8 | 1700 | return -1; |
1701 | } | |
5e934f78 | 1702 | #ifndef BROKEN_TCGETATTR_ICANON |
c1c6a032 | 1703 | if (compat20 && c->isatty && dlen >= 1 && buf[0] != '\r') { |
0ae4fe1d | 1704 | if (tcgetattr(c->wfd, &tio) == 0 && |
1705 | !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) { | |
1706 | /* | |
1707 | * Simulate echo to reduce the impact of | |
355724fc | 1708 | * traffic analysis. We need to match the |
95ce5599 | 1709 | * size of a SSH2_MSG_CHANNEL_DATA message |
c1c6a032 | 1710 | * (4 byte channel id + buf) |
0ae4fe1d | 1711 | */ |
95ce5599 | 1712 | packet_send_ignore(4 + len); |
0ae4fe1d | 1713 | packet_send(); |
0ae4fe1d | 1714 | } |
1715 | } | |
5e934f78 | 1716 | #endif |
7368a6c8 | 1717 | buffer_consume(&c->output, len); |
7e7327a1 | 1718 | if (compat20 && len > 0) { |
1719 | c->local_consumed += len; | |
1720 | } | |
1721 | } | |
1722 | return 1; | |
1723 | } | |
a7137f6b | 1724 | |
396c147e | 1725 | static int |
c8e9c167 | 1726 | channel_handle_efd(Channel *c, fd_set *readset, fd_set *writeset) |
7e7327a1 | 1727 | { |
fa1d7d85 | 1728 | char buf[CHAN_RBUF]; |
7e7327a1 | 1729 | int len; |
1730 | ||
8ce64345 | 1731 | /** XXX handle drain efd, too */ |
7e7327a1 | 1732 | if (c->efd != -1) { |
1733 | if (c->extended_usage == CHAN_EXTENDED_WRITE && | |
1734 | FD_ISSET(c->efd, writeset) && | |
1735 | buffer_len(&c->extended) > 0) { | |
1736 | len = write(c->efd, buffer_ptr(&c->extended), | |
1737 | buffer_len(&c->extended)); | |
de273eef | 1738 | debug2("channel %d: written %d to efd %d", |
7e7327a1 | 1739 | c->self, len, c->efd); |
5a0c8771 | 1740 | if (len < 0 && (errno == EINTR || errno == EAGAIN || |
1741 | errno == EWOULDBLOCK)) | |
ee55dacf | 1742 | return 1; |
1743 | if (len <= 0) { | |
1744 | debug2("channel %d: closing write-efd %d", | |
1745 | c->self, c->efd); | |
489aa2e9 | 1746 | channel_close_fd(&c->efd); |
ee55dacf | 1747 | } else { |
7e7327a1 | 1748 | buffer_consume(&c->extended, len); |
1749 | c->local_consumed += len; | |
1750 | } | |
1751 | } else if (c->extended_usage == CHAN_EXTENDED_READ && | |
34640ce6 | 1752 | (c->detach_close || FD_ISSET(c->efd, readset))) { |
7e7327a1 | 1753 | len = read(c->efd, buf, sizeof(buf)); |
de273eef | 1754 | debug2("channel %d: read %d from efd %d", |
184eed6a | 1755 | c->self, len, c->efd); |
5a0c8771 | 1756 | if (len < 0 && (errno == EINTR || ((errno == EAGAIN || |
1757 | errno == EWOULDBLOCK) && !c->detach_close))) | |
ee55dacf | 1758 | return 1; |
1759 | if (len <= 0) { | |
1760 | debug2("channel %d: closing read-efd %d", | |
8ce64345 | 1761 | c->self, c->efd); |
489aa2e9 | 1762 | channel_close_fd(&c->efd); |
ee55dacf | 1763 | } else { |
7e7327a1 | 1764 | buffer_append(&c->extended, buf, len); |
ee55dacf | 1765 | } |
7e7327a1 | 1766 | } |
1767 | } | |
1768 | return 1; | |
1769 | } | |
a7137f6b | 1770 | |
5e96b616 | 1771 | static int |
ee55dacf | 1772 | channel_check_window(Channel *c) |
7e7327a1 | 1773 | { |
28b9cb4d | 1774 | if (c->type == SSH_CHANNEL_OPEN && |
1775 | !(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) && | |
d9245683 | 1776 | ((c->local_window_max - c->local_window > |
68a73f53 | 1777 | c->local_maxpacket*3) || |
1778 | c->local_window < c->local_window_max/2) && | |
7e7327a1 | 1779 | c->local_consumed > 0) { |
1780 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); | |
1781 | packet_put_int(c->remote_id); | |
1782 | packet_put_int(c->local_consumed); | |
1783 | packet_send(); | |
de273eef | 1784 | debug2("channel %d: window %d sent adjust %d", |
7e7327a1 | 1785 | c->self, c->local_window, |
1786 | c->local_consumed); | |
1787 | c->local_window += c->local_consumed; | |
1788 | c->local_consumed = 0; | |
7368a6c8 | 1789 | } |
1790 | return 1; | |
1791 | } | |
5260325f | 1792 | |
396c147e | 1793 | static void |
c8e9c167 | 1794 | channel_post_open(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1795 | { |
1796 | channel_handle_rfd(c, readset, writeset); | |
1797 | channel_handle_wfd(c, readset, writeset); | |
0c0738d5 | 1798 | if (!compat20) |
639cb8ab | 1799 | return; |
7e7327a1 | 1800 | channel_handle_efd(c, readset, writeset); |
ee55dacf | 1801 | channel_check_window(c); |
7e7327a1 | 1802 | } |
1803 | ||
a858eae9 | 1804 | static u_int |
1805 | read_mux(Channel *c, u_int need) | |
1806 | { | |
1807 | char buf[CHAN_RBUF]; | |
1808 | int len; | |
1809 | u_int rlen; | |
1810 | ||
1811 | if (buffer_len(&c->input) < need) { | |
1812 | rlen = need - buffer_len(&c->input); | |
1813 | len = read(c->rfd, buf, MIN(rlen, CHAN_RBUF)); | |
1814 | if (len <= 0) { | |
1815 | if (errno != EINTR && errno != EAGAIN) { | |
1816 | debug2("channel %d: ctl read<=0 rfd %d len %d", | |
1817 | c->self, c->rfd, len); | |
1818 | chan_read_failed(c); | |
1819 | return 0; | |
1820 | } | |
1821 | } else | |
1822 | buffer_append(&c->input, buf, len); | |
1823 | } | |
1824 | return buffer_len(&c->input); | |
1825 | } | |
1826 | ||
1827 | static void | |
1828 | channel_post_mux_client(Channel *c, fd_set *readset, fd_set *writeset) | |
1829 | { | |
1830 | u_int need; | |
1831 | ssize_t len; | |
1832 | ||
1833 | if (!compat20) | |
1834 | fatal("%s: entered with !compat20", __func__); | |
1835 | ||
1836 | if (c->rfd != -1 && FD_ISSET(c->rfd, readset) && | |
1837 | (c->istate == CHAN_INPUT_OPEN || | |
1838 | c->istate == CHAN_INPUT_WAIT_DRAIN)) { | |
1839 | /* | |
1840 | * Don't not read past the precise end of packets to | |
1841 | * avoid disrupting fd passing. | |
1842 | */ | |
1843 | if (read_mux(c, 4) < 4) /* read header */ | |
1844 | return; | |
1845 | need = get_u32(buffer_ptr(&c->input)); | |
1846 | #define CHANNEL_MUX_MAX_PACKET (256 * 1024) | |
1847 | if (need > CHANNEL_MUX_MAX_PACKET) { | |
1848 | debug2("channel %d: packet too big %u > %u", | |
1849 | c->self, CHANNEL_MUX_MAX_PACKET, need); | |
1850 | chan_rcvd_oclose(c); | |
1851 | return; | |
1852 | } | |
1853 | if (read_mux(c, need + 4) < need + 4) /* read body */ | |
1854 | return; | |
1855 | if (c->mux_rcb(c) != 0) { | |
1856 | debug("channel %d: mux_rcb failed", c->self); | |
1857 | chan_mark_dead(c); | |
1858 | return; | |
1859 | } | |
1860 | } | |
1861 | ||
1862 | if (c->wfd != -1 && FD_ISSET(c->wfd, writeset) && | |
1863 | buffer_len(&c->output) > 0) { | |
1864 | len = write(c->wfd, buffer_ptr(&c->output), | |
1865 | buffer_len(&c->output)); | |
1866 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) | |
1867 | return; | |
1868 | if (len <= 0) { | |
1869 | chan_mark_dead(c); | |
1870 | return; | |
1871 | } | |
1872 | buffer_consume(&c->output, len); | |
1873 | } | |
1874 | } | |
1875 | ||
1876 | static void | |
1877 | channel_post_mux_listener(Channel *c, fd_set *readset, fd_set *writeset) | |
1878 | { | |
1879 | Channel *nc; | |
1880 | struct sockaddr_storage addr; | |
1881 | socklen_t addrlen; | |
1882 | int newsock; | |
1883 | uid_t euid; | |
1884 | gid_t egid; | |
1885 | ||
1886 | if (!FD_ISSET(c->sock, readset)) | |
1887 | return; | |
1888 | ||
1889 | debug("multiplexing control connection"); | |
1890 | ||
1891 | /* | |
1892 | * Accept connection on control socket | |
1893 | */ | |
1894 | memset(&addr, 0, sizeof(addr)); | |
1895 | addrlen = sizeof(addr); | |
1896 | if ((newsock = accept(c->sock, (struct sockaddr*)&addr, | |
1897 | &addrlen)) == -1) { | |
1898 | error("%s accept: %s", __func__, strerror(errno)); | |
1899 | return; | |
1900 | } | |
1901 | ||
1902 | if (getpeereid(newsock, &euid, &egid) < 0) { | |
1903 | error("%s getpeereid failed: %s", __func__, | |
1904 | strerror(errno)); | |
1905 | close(newsock); | |
1906 | return; | |
1907 | } | |
1908 | if ((euid != 0) && (getuid() != euid)) { | |
1909 | error("multiplex uid mismatch: peer euid %u != uid %u", | |
1910 | (u_int)euid, (u_int)getuid()); | |
1911 | close(newsock); | |
1912 | return; | |
1913 | } | |
1914 | nc = channel_new("multiplex client", SSH_CHANNEL_MUX_CLIENT, | |
1915 | newsock, newsock, -1, c->local_window_max, | |
1916 | c->local_maxpacket, 0, "mux-control", 1); | |
1917 | nc->mux_rcb = c->mux_rcb; | |
1918 | debug3("%s: new mux channel %d fd %d", __func__, | |
1919 | nc->self, nc->sock); | |
1920 | /* establish state */ | |
1921 | nc->mux_rcb(nc); | |
1922 | /* mux state transitions must not elicit protocol messages */ | |
1923 | nc->flags |= CHAN_LOCAL; | |
1924 | } | |
1925 | ||
ebb90778 | 1926 | /* ARGSUSED */ |
396c147e | 1927 | static void |
c8e9c167 | 1928 | channel_post_output_drain_13(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1929 | { |
1930 | int len; | |
e1feb9bf | 1931 | |
7368a6c8 | 1932 | /* Send buffered output data to the socket. */ |
1933 | if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) { | |
1934 | len = write(c->sock, buffer_ptr(&c->output), | |
1935 | buffer_len(&c->output)); | |
1936 | if (len <= 0) | |
9c50edcf | 1937 | buffer_clear(&c->output); |
7368a6c8 | 1938 | else |
1939 | buffer_consume(&c->output, len); | |
1940 | } | |
1941 | } | |
5260325f | 1942 | |
396c147e | 1943 | static void |
7e7327a1 | 1944 | channel_handler_init_20(void) |
1945 | { | |
0c0738d5 | 1946 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open; |
0b242b12 | 1947 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
7e7327a1 | 1948 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; |
fa08c86b | 1949 | channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener; |
0b242b12 | 1950 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
fa08c86b | 1951 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; |
97fb6912 | 1952 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1953 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
a858eae9 | 1954 | channel_pre[SSH_CHANNEL_MUX_LISTENER] = &channel_pre_listener; |
1955 | channel_pre[SSH_CHANNEL_MUX_CLIENT] = &channel_pre_mux_client; | |
7e7327a1 | 1956 | |
0c0738d5 | 1957 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
7e7327a1 | 1958 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; |
fa08c86b | 1959 | channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener; |
0b242b12 | 1960 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
fa08c86b | 1961 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; |
97fb6912 | 1962 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 1963 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
a858eae9 | 1964 | channel_post[SSH_CHANNEL_MUX_LISTENER] = &channel_post_mux_listener; |
1965 | channel_post[SSH_CHANNEL_MUX_CLIENT] = &channel_post_mux_client; | |
7e7327a1 | 1966 | } |
1967 | ||
396c147e | 1968 | static void |
7368a6c8 | 1969 | channel_handler_init_13(void) |
1970 | { | |
1971 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13; | |
1972 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_13; | |
1973 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; | |
1974 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; | |
1975 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; | |
1976 | channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining; | |
1977 | channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining; | |
97fb6912 | 1978 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1979 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7368a6c8 | 1980 | |
0c0738d5 | 1981 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
7368a6c8 | 1982 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
1983 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; | |
1984 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; | |
1985 | channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13; | |
97fb6912 | 1986 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 1987 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
7368a6c8 | 1988 | } |
5260325f | 1989 | |
396c147e | 1990 | static void |
7368a6c8 | 1991 | channel_handler_init_15(void) |
1992 | { | |
0c0738d5 | 1993 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open; |
0b242b12 | 1994 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
7368a6c8 | 1995 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
1996 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; | |
1997 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; | |
97fb6912 | 1998 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1999 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7368a6c8 | 2000 | |
2001 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; | |
2002 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; | |
2003 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; | |
0c0738d5 | 2004 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
97fb6912 | 2005 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 2006 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
7368a6c8 | 2007 | } |
2008 | ||
396c147e | 2009 | static void |
7368a6c8 | 2010 | channel_handler_init(void) |
2011 | { | |
2012 | int i; | |
e1feb9bf | 2013 | |
184eed6a | 2014 | for (i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) { |
7368a6c8 | 2015 | channel_pre[i] = NULL; |
2016 | channel_post[i] = NULL; | |
2017 | } | |
7e7327a1 | 2018 | if (compat20) |
2019 | channel_handler_init_20(); | |
2020 | else if (compat13) | |
7368a6c8 | 2021 | channel_handler_init_13(); |
2022 | else | |
2023 | channel_handler_init_15(); | |
2024 | } | |
2025 | ||
418e724c | 2026 | /* gc dead channels */ |
2027 | static void | |
2028 | channel_garbage_collect(Channel *c) | |
2029 | { | |
2030 | if (c == NULL) | |
2031 | return; | |
2032 | if (c->detach_user != NULL) { | |
8cd0437d | 2033 | if (!chan_is_dead(c, c->detach_close)) |
418e724c | 2034 | return; |
d7ac5f18 | 2035 | debug2("channel %d: gc: notify user", c->self); |
418e724c | 2036 | c->detach_user(c->self, NULL); |
2037 | /* if we still have a callback */ | |
2038 | if (c->detach_user != NULL) | |
2039 | return; | |
d7ac5f18 | 2040 | debug2("channel %d: gc: user detached", c->self); |
418e724c | 2041 | } |
2042 | if (!chan_is_dead(c, 1)) | |
2043 | return; | |
d7ac5f18 | 2044 | debug2("channel %d: garbage collecting", c->self); |
418e724c | 2045 | channel_free(c); |
2046 | } | |
2047 | ||
396c147e | 2048 | static void |
c8e9c167 | 2049 | channel_handler(chan_fn *ftab[], fd_set *readset, fd_set *writeset) |
7368a6c8 | 2050 | { |
2051 | static int did_init = 0; | |
7501ed0d | 2052 | u_int i, oalloc; |
7368a6c8 | 2053 | Channel *c; |
2054 | ||
2055 | if (!did_init) { | |
2056 | channel_handler_init(); | |
2057 | did_init = 1; | |
2058 | } | |
7501ed0d | 2059 | for (i = 0, oalloc = channels_alloc; i < oalloc; i++) { |
719fc62f | 2060 | c = channels[i]; |
2061 | if (c == NULL) | |
5260325f | 2062 | continue; |
7501ed0d | 2063 | if (c->delayed) { |
2064 | if (ftab == channel_pre) | |
2065 | c->delayed = 0; | |
2066 | else | |
2067 | continue; | |
2068 | } | |
6fd8622b | 2069 | if (ftab[c->type] != NULL) |
2070 | (*ftab[c->type])(c, readset, writeset); | |
418e724c | 2071 | channel_garbage_collect(c); |
8efc0c15 | 2072 | } |
8efc0c15 | 2073 | } |
2074 | ||
8e7895b8 | 2075 | /* |
2076 | * Allocate/update select bitmasks and add any bits relevant to channels in | |
2077 | * select bitmasks. | |
2078 | */ | |
6ae2364d | 2079 | void |
c422989b | 2080 | channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp, |
9a995072 | 2081 | u_int *nallocp, int rekeying) |
7368a6c8 | 2082 | { |
c5d10563 | 2083 | u_int n, sz, nfdset; |
39929cdb | 2084 | |
2085 | n = MAX(*maxfdp, channel_max_fd); | |
2086 | ||
c5d10563 | 2087 | nfdset = howmany(n+1, NFDBITS); |
2088 | /* Explicitly test here, because xrealloc isn't always called */ | |
2089 | if (nfdset && SIZE_T_MAX / nfdset < sizeof(fd_mask)) | |
2090 | fatal("channel_prepare_select: max_fd (%d) is too large", n); | |
2091 | sz = nfdset * sizeof(fd_mask); | |
2092 | ||
489aa2e9 | 2093 | /* perhaps check sz < nalloc/2 and shrink? */ |
2094 | if (*readsetp == NULL || sz > *nallocp) { | |
c5d10563 | 2095 | *readsetp = xrealloc(*readsetp, nfdset, sizeof(fd_mask)); |
2096 | *writesetp = xrealloc(*writesetp, nfdset, sizeof(fd_mask)); | |
489aa2e9 | 2097 | *nallocp = sz; |
39929cdb | 2098 | } |
489aa2e9 | 2099 | *maxfdp = n; |
39929cdb | 2100 | memset(*readsetp, 0, sz); |
2101 | memset(*writesetp, 0, sz); | |
2102 | ||
c422989b | 2103 | if (!rekeying) |
2104 | channel_handler(channel_pre, *readsetp, *writesetp); | |
7368a6c8 | 2105 | } |
2106 | ||
8e7895b8 | 2107 | /* |
2108 | * After select, perform any appropriate operations for channels which have | |
2109 | * events pending. | |
2110 | */ | |
6ae2364d | 2111 | void |
c8e9c167 | 2112 | channel_after_select(fd_set *readset, fd_set *writeset) |
7368a6c8 | 2113 | { |
2114 | channel_handler(channel_post, readset, writeset); | |
2115 | } | |
2116 | ||
8e7895b8 | 2117 | |
39929cdb | 2118 | /* If there is data to send to the connection, enqueue some of it now. */ |
6ae2364d | 2119 | void |
d5bb9418 | 2120 | channel_output_poll(void) |
8efc0c15 | 2121 | { |
7368a6c8 | 2122 | Channel *c; |
9a995072 | 2123 | u_int i, len; |
5260325f | 2124 | |
2125 | for (i = 0; i < channels_alloc; i++) { | |
719fc62f | 2126 | c = channels[i]; |
2127 | if (c == NULL) | |
2128 | continue; | |
48e671d5 | 2129 | |
8e7895b8 | 2130 | /* |
2131 | * We are only interested in channels that can have buffered | |
2132 | * incoming data. | |
2133 | */ | |
48e671d5 | 2134 | if (compat13) { |
7368a6c8 | 2135 | if (c->type != SSH_CHANNEL_OPEN && |
2136 | c->type != SSH_CHANNEL_INPUT_DRAINING) | |
48e671d5 | 2137 | continue; |
2138 | } else { | |
7368a6c8 | 2139 | if (c->type != SSH_CHANNEL_OPEN) |
48e671d5 | 2140 | continue; |
48e671d5 | 2141 | } |
e78a59f5 | 2142 | if (compat20 && |
2143 | (c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) { | |
ee55dacf | 2144 | /* XXX is this true? */ |
418e724c | 2145 | debug3("channel %d: will not send data after close", c->self); |
7e7327a1 | 2146 | continue; |
2147 | } | |
5260325f | 2148 | |
2149 | /* Get the amount of buffered data for this channel. */ | |
ee55dacf | 2150 | if ((c->istate == CHAN_INPUT_OPEN || |
2151 | c->istate == CHAN_INPUT_WAIT_DRAIN) && | |
2152 | (len = buffer_len(&c->input)) > 0) { | |
d20f3c9e | 2153 | if (c->datagram) { |
2154 | if (len > 0) { | |
2155 | u_char *data; | |
2156 | u_int dlen; | |
2157 | ||
2158 | data = buffer_get_string(&c->input, | |
2159 | &dlen); | |
2160 | packet_start(SSH2_MSG_CHANNEL_DATA); | |
2161 | packet_put_int(c->remote_id); | |
2162 | packet_put_string(data, dlen); | |
2163 | packet_send(); | |
2164 | c->remote_window -= dlen + 4; | |
2165 | xfree(data); | |
2166 | } | |
2167 | continue; | |
2168 | } | |
8e7895b8 | 2169 | /* |
2170 | * Send some data for the other side over the secure | |
2171 | * connection. | |
2172 | */ | |
7e7327a1 | 2173 | if (compat20) { |
2174 | if (len > c->remote_window) | |
2175 | len = c->remote_window; | |
2176 | if (len > c->remote_maxpacket) | |
2177 | len = c->remote_maxpacket; | |
5260325f | 2178 | } else { |
7e7327a1 | 2179 | if (packet_is_interactive()) { |
2180 | if (len > 1024) | |
2181 | len = 512; | |
2182 | } else { | |
2183 | /* Keep the packets at reasonable size. */ | |
2184 | if (len > packet_get_maxsize()/2) | |
2185 | len = packet_get_maxsize()/2; | |
2186 | } | |
5260325f | 2187 | } |
7368a6c8 | 2188 | if (len > 0) { |
7e7327a1 | 2189 | packet_start(compat20 ? |
2190 | SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA); | |
7368a6c8 | 2191 | packet_put_int(c->remote_id); |
2192 | packet_put_string(buffer_ptr(&c->input), len); | |
2193 | packet_send(); | |
2194 | buffer_consume(&c->input, len); | |
2195 | c->remote_window -= len; | |
7368a6c8 | 2196 | } |
2197 | } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) { | |
5260325f | 2198 | if (compat13) |
2199 | fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3"); | |
aa3378df | 2200 | /* |
2201 | * input-buffer is empty and read-socket shutdown: | |
d2296ed7 | 2202 | * tell peer, that we will not send more data: send IEOF. |
2203 | * hack for extended data: delay EOF if EFD still in use. | |
aa3378df | 2204 | */ |
d2296ed7 | 2205 | if (CHANNEL_EFD_INPUT_ACTIVE(c)) |
4e2e5cfd | 2206 | debug2("channel %d: ibuf_empty delayed efd %d/(%d)", |
2207 | c->self, c->efd, buffer_len(&c->extended)); | |
d2296ed7 | 2208 | else |
2209 | chan_ibuf_empty(c); | |
5260325f | 2210 | } |
7e7327a1 | 2211 | /* Send extended data, i.e. stderr */ |
2212 | if (compat20 && | |
d2296ed7 | 2213 | !(c->flags & CHAN_EOF_SENT) && |
7e7327a1 | 2214 | c->remote_window > 0 && |
2215 | (len = buffer_len(&c->extended)) > 0 && | |
2216 | c->extended_usage == CHAN_EXTENDED_READ) { | |
f91d9a89 | 2217 | debug2("channel %d: rwin %u elen %u euse %d", |
ee55dacf | 2218 | c->self, c->remote_window, buffer_len(&c->extended), |
2219 | c->extended_usage); | |
7e7327a1 | 2220 | if (len > c->remote_window) |
2221 | len = c->remote_window; | |
2222 | if (len > c->remote_maxpacket) | |
2223 | len = c->remote_maxpacket; | |
2224 | packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA); | |
2225 | packet_put_int(c->remote_id); | |
2226 | packet_put_int(SSH2_EXTENDED_DATA_STDERR); | |
2227 | packet_put_string(buffer_ptr(&c->extended), len); | |
2228 | packet_send(); | |
2229 | buffer_consume(&c->extended, len); | |
2230 | c->remote_window -= len; | |
ee55dacf | 2231 | debug2("channel %d: sent ext data %d", c->self, len); |
7e7327a1 | 2232 | } |
8efc0c15 | 2233 | } |
8efc0c15 | 2234 | } |
2235 | ||
8e7895b8 | 2236 | |
2237 | /* -- protocol input */ | |
04aa9e67 | 2238 | |
2239 | /* ARGSUSED */ | |
6ae2364d | 2240 | void |
7819b5c3 | 2241 | channel_input_data(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2242 | { |
48e671d5 | 2243 | int id; |
5260325f | 2244 | char *data; |
1e3b8b07 | 2245 | u_int data_len; |
7368a6c8 | 2246 | Channel *c; |
5260325f | 2247 | |
2248 | /* Get the channel number and verify it. */ | |
48e671d5 | 2249 | id = packet_get_int(); |
7368a6c8 | 2250 | c = channel_lookup(id); |
2251 | if (c == NULL) | |
48e671d5 | 2252 | packet_disconnect("Received data for nonexistent channel %d.", id); |
5260325f | 2253 | |
2254 | /* Ignore any data for non-open channels (might happen on close) */ | |
7368a6c8 | 2255 | if (c->type != SSH_CHANNEL_OPEN && |
2256 | c->type != SSH_CHANNEL_X11_OPEN) | |
48e671d5 | 2257 | return; |
2258 | ||
5260325f | 2259 | /* Get the data. */ |
17f02f0a | 2260 | data = packet_get_string_ptr(&data_len); |
7368a6c8 | 2261 | |
7741e239 | 2262 | /* |
2263 | * Ignore data for protocol > 1.3 if output end is no longer open. | |
2264 | * For protocol 2 the sending side is reducing its window as it sends | |
2265 | * data, so we must 'fake' consumption of the data in order to ensure | |
2266 | * that window updates are sent back. Otherwise the connection might | |
2267 | * deadlock. | |
2268 | */ | |
2269 | if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN) { | |
2270 | if (compat20) { | |
2271 | c->local_window -= data_len; | |
2272 | c->local_consumed += data_len; | |
2273 | } | |
7741e239 | 2274 | return; |
2275 | } | |
2276 | ||
6aacefa7 | 2277 | if (compat20) { |
7e7327a1 | 2278 | if (data_len > c->local_maxpacket) { |
bbe88b6d | 2279 | logit("channel %d: rcvd big packet %d, maxpack %d", |
7e7327a1 | 2280 | c->self, data_len, c->local_maxpacket); |
2281 | } | |
2282 | if (data_len > c->local_window) { | |
bbe88b6d | 2283 | logit("channel %d: rcvd too much data %d, win %d", |
7e7327a1 | 2284 | c->self, data_len, c->local_window); |
7e7327a1 | 2285 | return; |
2286 | } | |
2287 | c->local_window -= data_len; | |
7e7327a1 | 2288 | } |
d20f3c9e | 2289 | if (c->datagram) |
2290 | buffer_put_string(&c->output, data, data_len); | |
2291 | else | |
2292 | buffer_append(&c->output, data, data_len); | |
17f02f0a | 2293 | packet_check_eom(); |
8efc0c15 | 2294 | } |
8e7895b8 | 2295 | |
04aa9e67 | 2296 | /* ARGSUSED */ |
6ae2364d | 2297 | void |
7819b5c3 | 2298 | channel_input_extended_data(int type, u_int32_t seq, void *ctxt) |
7e7327a1 | 2299 | { |
2300 | int id; | |
7e7327a1 | 2301 | char *data; |
a594fa74 | 2302 | u_int data_len, tcode; |
7e7327a1 | 2303 | Channel *c; |
2304 | ||
2305 | /* Get the channel number and verify it. */ | |
2306 | id = packet_get_int(); | |
2307 | c = channel_lookup(id); | |
2308 | ||
2309 | if (c == NULL) | |
2310 | packet_disconnect("Received extended_data for bad channel %d.", id); | |
2311 | if (c->type != SSH_CHANNEL_OPEN) { | |
bbe88b6d | 2312 | logit("channel %d: ext data for non open", id); |
7e7327a1 | 2313 | return; |
2314 | } | |
d2296ed7 | 2315 | if (c->flags & CHAN_EOF_RCVD) { |
2316 | if (datafellows & SSH_BUG_EXTEOF) | |
2317 | debug("channel %d: accepting ext data after eof", id); | |
2318 | else | |
2319 | packet_disconnect("Received extended_data after EOF " | |
2320 | "on channel %d.", id); | |
2321 | } | |
7e7327a1 | 2322 | tcode = packet_get_int(); |
2323 | if (c->efd == -1 || | |
2324 | c->extended_usage != CHAN_EXTENDED_WRITE || | |
2325 | tcode != SSH2_EXTENDED_DATA_STDERR) { | |
bbe88b6d | 2326 | logit("channel %d: bad ext data", c->self); |
7e7327a1 | 2327 | return; |
2328 | } | |
2329 | data = packet_get_string(&data_len); | |
95500969 | 2330 | packet_check_eom(); |
7e7327a1 | 2331 | if (data_len > c->local_window) { |
bbe88b6d | 2332 | logit("channel %d: rcvd too much extended_data %d, win %d", |
7e7327a1 | 2333 | c->self, data_len, c->local_window); |
2334 | xfree(data); | |
2335 | return; | |
2336 | } | |
de273eef | 2337 | debug2("channel %d: rcvd ext data %d", c->self, data_len); |
7e7327a1 | 2338 | c->local_window -= data_len; |
2339 | buffer_append(&c->extended, data, data_len); | |
2340 | xfree(data); | |
2341 | } | |
2342 | ||
04aa9e67 | 2343 | /* ARGSUSED */ |
6ae2364d | 2344 | void |
7819b5c3 | 2345 | channel_input_ieof(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 2346 | { |
2347 | int id; | |
2348 | Channel *c; | |
2349 | ||
7368a6c8 | 2350 | id = packet_get_int(); |
95500969 | 2351 | packet_check_eom(); |
7368a6c8 | 2352 | c = channel_lookup(id); |
2353 | if (c == NULL) | |
2354 | packet_disconnect("Received ieof for nonexistent channel %d.", id); | |
2355 | chan_rcvd_ieof(c); | |
a5f82435 | 2356 | |
2357 | /* XXX force input close */ | |
8341f420 | 2358 | if (c->force_drain && c->istate == CHAN_INPUT_OPEN) { |
a5f82435 | 2359 | debug("channel %d: FORCE input drain", c->self); |
2360 | c->istate = CHAN_INPUT_WAIT_DRAIN; | |
32e7d71f | 2361 | if (buffer_len(&c->input) == 0) |
2362 | chan_ibuf_empty(c); | |
a5f82435 | 2363 | } |
2364 | ||
7368a6c8 | 2365 | } |
8efc0c15 | 2366 | |
04aa9e67 | 2367 | /* ARGSUSED */ |
6ae2364d | 2368 | void |
7819b5c3 | 2369 | channel_input_close(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2370 | { |
7368a6c8 | 2371 | int id; |
2372 | Channel *c; | |
5260325f | 2373 | |
7368a6c8 | 2374 | id = packet_get_int(); |
95500969 | 2375 | packet_check_eom(); |
7368a6c8 | 2376 | c = channel_lookup(id); |
2377 | if (c == NULL) | |
2378 | packet_disconnect("Received close for nonexistent channel %d.", id); | |
aa3378df | 2379 | |
2380 | /* | |
2381 | * Send a confirmation that we have closed the channel and no more | |
2382 | * data is coming for it. | |
2383 | */ | |
5260325f | 2384 | packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION); |
7368a6c8 | 2385 | packet_put_int(c->remote_id); |
5260325f | 2386 | packet_send(); |
2387 | ||
aa3378df | 2388 | /* |
2389 | * If the channel is in closed state, we have sent a close request, | |
2390 | * and the other side will eventually respond with a confirmation. | |
2391 | * Thus, we cannot free the channel here, because then there would be | |
2392 | * no-one to receive the confirmation. The channel gets freed when | |
2393 | * the confirmation arrives. | |
2394 | */ | |
7368a6c8 | 2395 | if (c->type != SSH_CHANNEL_CLOSED) { |
aa3378df | 2396 | /* |
2397 | * Not a closed channel - mark it as draining, which will | |
2398 | * cause it to be freed later. | |
2399 | */ | |
9c50edcf | 2400 | buffer_clear(&c->input); |
7368a6c8 | 2401 | c->type = SSH_CHANNEL_OUTPUT_DRAINING; |
5260325f | 2402 | } |
8efc0c15 | 2403 | } |
2404 | ||
7368a6c8 | 2405 | /* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */ |
04aa9e67 | 2406 | /* ARGSUSED */ |
6ae2364d | 2407 | void |
7819b5c3 | 2408 | channel_input_oclose(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2409 | { |
7368a6c8 | 2410 | int id = packet_get_int(); |
2411 | Channel *c = channel_lookup(id); | |
a8a21a53 | 2412 | |
95500969 | 2413 | packet_check_eom(); |
7368a6c8 | 2414 | if (c == NULL) |
2415 | packet_disconnect("Received oclose for nonexistent channel %d.", id); | |
2416 | chan_rcvd_oclose(c); | |
8efc0c15 | 2417 | } |
2418 | ||
04aa9e67 | 2419 | /* ARGSUSED */ |
6ae2364d | 2420 | void |
7819b5c3 | 2421 | channel_input_close_confirmation(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 2422 | { |
2423 | int id = packet_get_int(); | |
2424 | Channel *c = channel_lookup(id); | |
2425 | ||
95500969 | 2426 | packet_check_eom(); |
7368a6c8 | 2427 | if (c == NULL) |
2428 | packet_disconnect("Received close confirmation for " | |
2429 | "out-of-range channel %d.", id); | |
2430 | if (c->type != SSH_CHANNEL_CLOSED) | |
2431 | packet_disconnect("Received close confirmation for " | |
2432 | "non-closed channel %d (type %d).", id, c->type); | |
719fc62f | 2433 | channel_free(c); |
7368a6c8 | 2434 | } |
8efc0c15 | 2435 | |
04aa9e67 | 2436 | /* ARGSUSED */ |
6ae2364d | 2437 | void |
7819b5c3 | 2438 | channel_input_open_confirmation(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2439 | { |
7368a6c8 | 2440 | int id, remote_id; |
2441 | Channel *c; | |
5260325f | 2442 | |
7368a6c8 | 2443 | id = packet_get_int(); |
2444 | c = channel_lookup(id); | |
5260325f | 2445 | |
7368a6c8 | 2446 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) |
2447 | packet_disconnect("Received open confirmation for " | |
2448 | "non-opening channel %d.", id); | |
2449 | remote_id = packet_get_int(); | |
aa3378df | 2450 | /* Record the remote channel number and mark that the channel is now open. */ |
7368a6c8 | 2451 | c->remote_id = remote_id; |
2452 | c->type = SSH_CHANNEL_OPEN; | |
7e7327a1 | 2453 | |
2454 | if (compat20) { | |
2455 | c->remote_window = packet_get_int(); | |
2456 | c->remote_maxpacket = packet_get_int(); | |
3593bdc0 | 2457 | if (c->open_confirm) { |
de273eef | 2458 | debug2("callback start"); |
3593bdc0 | 2459 | c->open_confirm(c->self, c->open_confirm_ctx); |
de273eef | 2460 | debug2("callback done"); |
7e7327a1 | 2461 | } |
d7ac5f18 | 2462 | debug2("channel %d: open confirm rwindow %u rmax %u", c->self, |
7e7327a1 | 2463 | c->remote_window, c->remote_maxpacket); |
2464 | } | |
95500969 | 2465 | packet_check_eom(); |
8efc0c15 | 2466 | } |
2467 | ||
396c147e | 2468 | static char * |
d18e0850 | 2469 | reason2txt(int reason) |
2470 | { | |
6aacefa7 | 2471 | switch (reason) { |
d18e0850 | 2472 | case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED: |
2473 | return "administratively prohibited"; | |
2474 | case SSH2_OPEN_CONNECT_FAILED: | |
2475 | return "connect failed"; | |
2476 | case SSH2_OPEN_UNKNOWN_CHANNEL_TYPE: | |
2477 | return "unknown channel type"; | |
2478 | case SSH2_OPEN_RESOURCE_SHORTAGE: | |
2479 | return "resource shortage"; | |
2480 | } | |
7e8c18e9 | 2481 | return "unknown reason"; |
d18e0850 | 2482 | } |
2483 | ||
04aa9e67 | 2484 | /* ARGSUSED */ |
6ae2364d | 2485 | void |
7819b5c3 | 2486 | channel_input_open_failure(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2487 | { |
02a024dd | 2488 | int id, reason; |
2489 | char *msg = NULL, *lang = NULL; | |
7368a6c8 | 2490 | Channel *c; |
5260325f | 2491 | |
7368a6c8 | 2492 | id = packet_get_int(); |
2493 | c = channel_lookup(id); | |
2494 | ||
2495 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) | |
2496 | packet_disconnect("Received open failure for " | |
2497 | "non-opening channel %d.", id); | |
7e7327a1 | 2498 | if (compat20) { |
02a024dd | 2499 | reason = packet_get_int(); |
fbe90f7b | 2500 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { |
02a024dd | 2501 | msg = packet_get_string(NULL); |
2502 | lang = packet_get_string(NULL); | |
2503 | } | |
bbe88b6d | 2504 | logit("channel %d: open failed: %s%s%s", id, |
d18e0850 | 2505 | reason2txt(reason), msg ? ": ": "", msg ? msg : ""); |
02a024dd | 2506 | if (msg != NULL) |
2507 | xfree(msg); | |
2508 | if (lang != NULL) | |
2509 | xfree(lang); | |
7e7327a1 | 2510 | } |
95500969 | 2511 | packet_check_eom(); |
6cf44b6a | 2512 | /* Schedule the channel for cleanup/deletion. */ |
2513 | chan_mark_dead(c); | |
8efc0c15 | 2514 | } |
2515 | ||
04aa9e67 | 2516 | /* ARGSUSED */ |
8e7895b8 | 2517 | void |
7819b5c3 | 2518 | channel_input_window_adjust(int type, u_int32_t seq, void *ctxt) |
8e7895b8 | 2519 | { |
2520 | Channel *c; | |
f91d9a89 | 2521 | int id; |
2522 | u_int adjust; | |
3ffc6336 | 2523 | |
8e7895b8 | 2524 | if (!compat20) |
2525 | return; | |
8efc0c15 | 2526 | |
8e7895b8 | 2527 | /* Get the channel number and verify it. */ |
2528 | id = packet_get_int(); | |
2529 | c = channel_lookup(id); | |
2530 | ||
b872f7f0 | 2531 | if (c == NULL) { |
2532 | logit("Received window adjust for non-open channel %d.", id); | |
8e7895b8 | 2533 | return; |
2534 | } | |
2535 | adjust = packet_get_int(); | |
95500969 | 2536 | packet_check_eom(); |
f91d9a89 | 2537 | debug2("channel %d: rcvd adjust %u", id, adjust); |
8e7895b8 | 2538 | c->remote_window += adjust; |
2539 | } | |
2540 | ||
04aa9e67 | 2541 | /* ARGSUSED */ |
8e7895b8 | 2542 | void |
7819b5c3 | 2543 | channel_input_port_open(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2544 | { |
8e7895b8 | 2545 | Channel *c = NULL; |
2546 | u_short host_port; | |
2547 | char *host, *originator_string; | |
e07e21ad | 2548 | int remote_id; |
5260325f | 2549 | |
8e7895b8 | 2550 | remote_id = packet_get_int(); |
2551 | host = packet_get_string(NULL); | |
2552 | host_port = packet_get_int(); | |
2553 | ||
2554 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) { | |
2555 | originator_string = packet_get_string(NULL); | |
2556 | } else { | |
2557 | originator_string = xstrdup("unknown (remote did not supply name)"); | |
2558 | } | |
95500969 | 2559 | packet_check_eom(); |
e07e21ad | 2560 | c = channel_connect_to(host, host_port, |
2561 | "connected socket", originator_string); | |
0d942eff | 2562 | xfree(originator_string); |
e07e21ad | 2563 | xfree(host); |
8e7895b8 | 2564 | if (c == NULL) { |
2565 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
2566 | packet_put_int(remote_id); | |
2567 | packet_send(); | |
e07e21ad | 2568 | } else |
2569 | c->remote_id = remote_id; | |
8efc0c15 | 2570 | } |
2571 | ||
3593bdc0 | 2572 | /* ARGSUSED */ |
2573 | void | |
2574 | channel_input_status_confirm(int type, u_int32_t seq, void *ctxt) | |
2575 | { | |
2576 | Channel *c; | |
2577 | struct channel_confirm *cc; | |
b09b559d | 2578 | int id; |
3593bdc0 | 2579 | |
2580 | /* Reset keepalive timeout */ | |
dc1f1948 | 2581 | packet_set_alive_timeouts(0); |
3593bdc0 | 2582 | |
b09b559d | 2583 | id = packet_get_int(); |
3593bdc0 | 2584 | packet_check_eom(); |
2585 | ||
b09b559d | 2586 | debug2("channel_input_status_confirm: type %d id %d", type, id); |
3593bdc0 | 2587 | |
b09b559d | 2588 | if ((c = channel_lookup(id)) == NULL) { |
2589 | logit("channel_input_status_confirm: %d: unknown", id); | |
3593bdc0 | 2590 | return; |
2591 | } | |
2592 | ; | |
2593 | if ((cc = TAILQ_FIRST(&c->status_confirms)) == NULL) | |
2594 | return; | |
2595 | cc->cb(type, c, cc->ctx); | |
2596 | TAILQ_REMOVE(&c->status_confirms, cc, entry); | |
2597 | bzero(cc, sizeof(*cc)); | |
2598 | xfree(cc); | |
2599 | } | |
8e7895b8 | 2600 | |
2601 | /* -- tcp forwarding */ | |
2602 | ||
5e4a7219 | 2603 | void |
2604 | channel_set_af(int af) | |
2605 | { | |
2606 | IPv4or6 = af; | |
2607 | } | |
2608 | ||
5641aefa | 2609 | static int |
17525a70 | 2610 | channel_setup_fwd_listener(int type, const char *listen_addr, |
2611 | u_short listen_port, int *allocated_listen_port, | |
5641aefa | 2612 | const char *host_to_connect, u_short port_to_connect, int gateway_ports) |
8efc0c15 | 2613 | { |
719fc62f | 2614 | Channel *c; |
442aee3a | 2615 | int sock, r, success = 0, wildcard = 0, is_client; |
48e671d5 | 2616 | struct addrinfo hints, *ai, *aitop; |
3867aa0a | 2617 | const char *host, *addr; |
5641aefa | 2618 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
17525a70 | 2619 | in_port_t *lport_p; |
5260325f | 2620 | |
5641aefa | 2621 | host = (type == SSH_CHANNEL_RPORT_LISTENER) ? |
2622 | listen_addr : host_to_connect; | |
3867aa0a | 2623 | is_client = (type == SSH_CHANNEL_PORT_LISTENER); |
02a024dd | 2624 | |
5641aefa | 2625 | if (host == NULL) { |
2626 | error("No forward host name."); | |
38946c65 | 2627 | return 0; |
fa08c86b | 2628 | } |
920706fd | 2629 | if (strlen(host) >= NI_MAXHOST) { |
02a024dd | 2630 | error("Forward host name too long."); |
38946c65 | 2631 | return 0; |
02a024dd | 2632 | } |
5260325f | 2633 | |
3867aa0a | 2634 | /* |
2635 | * Determine whether or not a port forward listens to loopback, | |
f8cc7664 | 2636 | * specified address or wildcard. On the client, a specified bind |
2637 | * address will always override gateway_ports. On the server, a | |
2638 | * gateway_ports of 1 (``yes'') will override the client's | |
2639 | * specification and force a wildcard bind, whereas a value of 2 | |
2640 | * (``clientspecified'') will bind to whatever address the client | |
3867aa0a | 2641 | * asked for. |
2642 | * | |
2643 | * Special-case listen_addrs are: | |
2644 | * | |
2645 | * "0.0.0.0" -> wildcard v4/v6 if SSH_OLD_FORWARD_ADDR | |
2646 | * "" (empty string), "*" -> wildcard v4/v6 | |
2647 | * "localhost" -> loopback v4/v6 | |
2648 | */ | |
2649 | addr = NULL; | |
2650 | if (listen_addr == NULL) { | |
2651 | /* No address specified: default to gateway_ports setting */ | |
2652 | if (gateway_ports) | |
2653 | wildcard = 1; | |
2654 | } else if (gateway_ports || is_client) { | |
2655 | if (((datafellows & SSH_OLD_FORWARD_ADDR) && | |
bc4cc956 | 2656 | strcmp(listen_addr, "0.0.0.0") == 0 && is_client == 0) || |
3867aa0a | 2657 | *listen_addr == '\0' || strcmp(listen_addr, "*") == 0 || |
2658 | (!is_client && gateway_ports == 1)) | |
2659 | wildcard = 1; | |
2660 | else if (strcmp(listen_addr, "localhost") != 0) | |
2661 | addr = listen_addr; | |
2662 | } | |
2663 | ||
2664 | debug3("channel_setup_fwd_listener: type %d wildcard %d addr %s", | |
2665 | type, wildcard, (addr == NULL) ? "NULL" : addr); | |
2666 | ||
aa3378df | 2667 | /* |
48e671d5 | 2668 | * getaddrinfo returns a loopback address if the hostname is |
2669 | * set to NULL and hints.ai_flags is not AI_PASSIVE | |
aa3378df | 2670 | */ |
48e671d5 | 2671 | memset(&hints, 0, sizeof(hints)); |
2672 | hints.ai_family = IPv4or6; | |
3867aa0a | 2673 | hints.ai_flags = wildcard ? AI_PASSIVE : 0; |
48e671d5 | 2674 | hints.ai_socktype = SOCK_STREAM; |
fa08c86b | 2675 | snprintf(strport, sizeof strport, "%d", listen_port); |
3867aa0a | 2676 | if ((r = getaddrinfo(addr, strport, &hints, &aitop)) != 0) { |
2677 | if (addr == NULL) { | |
2678 | /* This really shouldn't happen */ | |
2679 | packet_disconnect("getaddrinfo: fatal error: %s", | |
bb4626fe | 2680 | ssh_gai_strerror(r)); |
3867aa0a | 2681 | } else { |
38946c65 | 2682 | error("channel_setup_fwd_listener: " |
bb4626fe | 2683 | "getaddrinfo(%.64s): %s", addr, |
2684 | ssh_gai_strerror(r)); | |
3867aa0a | 2685 | } |
38946c65 | 2686 | return 0; |
3867aa0a | 2687 | } |
17525a70 | 2688 | if (allocated_listen_port != NULL) |
2689 | *allocated_listen_port = 0; | |
48e671d5 | 2690 | for (ai = aitop; ai; ai = ai->ai_next) { |
17525a70 | 2691 | switch (ai->ai_family) { |
2692 | case AF_INET: | |
2693 | lport_p = &((struct sockaddr_in *)ai->ai_addr)-> | |
2694 | sin_port; | |
2695 | break; | |
2696 | case AF_INET6: | |
2697 | lport_p = &((struct sockaddr_in6 *)ai->ai_addr)-> | |
2698 | sin6_port; | |
2699 | break; | |
2700 | default: | |
48e671d5 | 2701 | continue; |
17525a70 | 2702 | } |
2703 | /* | |
2704 | * If allocating a port for -R forwards, then use the | |
2705 | * same port for all address families. | |
2706 | */ | |
2707 | if (type == SSH_CHANNEL_RPORT_LISTENER && listen_port == 0 && | |
2708 | allocated_listen_port != NULL && *allocated_listen_port > 0) | |
2709 | *lport_p = htons(*allocated_listen_port); | |
2710 | ||
48e671d5 | 2711 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), |
2712 | strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { | |
5641aefa | 2713 | error("channel_setup_fwd_listener: getnameinfo failed"); |
48e671d5 | 2714 | continue; |
2715 | } | |
2716 | /* Create a port to listen for the host. */ | |
16d64584 | 2717 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
48e671d5 | 2718 | if (sock < 0) { |
2719 | /* this is no error since kernel may not support ipv6 */ | |
2720 | verbose("socket: %.100s", strerror(errno)); | |
2721 | continue; | |
2722 | } | |
442aee3a | 2723 | |
2724 | channel_set_reuseaddr(sock); | |
4e1082aa | 2725 | if (ai->ai_family == AF_INET6) |
2726 | sock_set_v6only(sock); | |
facfd613 | 2727 | |
17525a70 | 2728 | debug("Local forwarding listening on %s port %s.", |
2729 | ntop, strport); | |
48e671d5 | 2730 | |
2731 | /* Bind the socket to the address. */ | |
2732 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { | |
2733 | /* address can be in use ipv6 address is already bound */ | |
16218745 | 2734 | if (!ai->ai_next) |
2735 | error("bind: %.100s", strerror(errno)); | |
2736 | else | |
2737 | verbose("bind: %.100s", strerror(errno)); | |
2b87da3b | 2738 | |
48e671d5 | 2739 | close(sock); |
2740 | continue; | |
2741 | } | |
2742 | /* Start listening for connections on the socket. */ | |
fce39749 | 2743 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { |
48e671d5 | 2744 | error("listen: %.100s", strerror(errno)); |
2745 | close(sock); | |
2746 | continue; | |
2747 | } | |
17525a70 | 2748 | |
2749 | /* | |
2750 | * listen_port == 0 requests a dynamically allocated port - | |
2751 | * record what we got. | |
2752 | */ | |
2753 | if (type == SSH_CHANNEL_RPORT_LISTENER && listen_port == 0 && | |
2754 | allocated_listen_port != NULL && | |
2755 | *allocated_listen_port == 0) { | |
2756 | *allocated_listen_port = get_sock_port(sock, 1); | |
2757 | debug("Allocated listen port %d", | |
2758 | *allocated_listen_port); | |
2759 | } | |
2760 | ||
48e671d5 | 2761 | /* Allocate a channel number for the socket. */ |
8e7895b8 | 2762 | c = channel_new("port listener", type, sock, sock, -1, |
0b242b12 | 2763 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, |
0d942eff | 2764 | 0, "port listener", 1); |
1338ba77 | 2765 | c->path = xstrdup(host); |
719fc62f | 2766 | c->host_port = port_to_connect; |
2767 | c->listening_port = listen_port; | |
48e671d5 | 2768 | success = 1; |
2769 | } | |
2770 | if (success == 0) | |
5641aefa | 2771 | error("channel_setup_fwd_listener: cannot listen to port: %d", |
02a024dd | 2772 | listen_port); |
48e671d5 | 2773 | freeaddrinfo(aitop); |
02a024dd | 2774 | return success; |
5260325f | 2775 | } |
8efc0c15 | 2776 | |
d740ec16 | 2777 | int |
2778 | channel_cancel_rport_listener(const char *host, u_short port) | |
2779 | { | |
9a995072 | 2780 | u_int i; |
2781 | int found = 0; | |
d740ec16 | 2782 | |
f8cc7664 | 2783 | for (i = 0; i < channels_alloc; i++) { |
d740ec16 | 2784 | Channel *c = channels[i]; |
2785 | ||
2786 | if (c != NULL && c->type == SSH_CHANNEL_RPORT_LISTENER && | |
1338ba77 | 2787 | strcmp(c->path, host) == 0 && c->listening_port == port) { |
2912cbd6 | 2788 | debug2("%s: close channel %d", __func__, i); |
d740ec16 | 2789 | channel_free(c); |
2790 | found = 1; | |
2791 | } | |
2792 | } | |
2793 | ||
2794 | return (found); | |
2795 | } | |
2796 | ||
5641aefa | 2797 | /* protocol local port fwd, used by ssh (and sshd in v1) */ |
2798 | int | |
3867aa0a | 2799 | channel_setup_local_fwd_listener(const char *listen_host, u_short listen_port, |
5641aefa | 2800 | const char *host_to_connect, u_short port_to_connect, int gateway_ports) |
2801 | { | |
2802 | return channel_setup_fwd_listener(SSH_CHANNEL_PORT_LISTENER, | |
17525a70 | 2803 | listen_host, listen_port, NULL, host_to_connect, port_to_connect, |
3867aa0a | 2804 | gateway_ports); |
5641aefa | 2805 | } |
2806 | ||
2807 | /* protocol v2 remote port fwd, used by sshd */ | |
2808 | int | |
2809 | channel_setup_remote_fwd_listener(const char *listen_address, | |
17525a70 | 2810 | u_short listen_port, int *allocated_listen_port, int gateway_ports) |
5641aefa | 2811 | { |
2812 | return channel_setup_fwd_listener(SSH_CHANNEL_RPORT_LISTENER, | |
17525a70 | 2813 | listen_address, listen_port, allocated_listen_port, |
2814 | NULL, 0, gateway_ports); | |
5641aefa | 2815 | } |
2816 | ||
aa3378df | 2817 | /* |
2818 | * Initiate forwarding of connections to port "port" on remote host through | |
2819 | * the secure channel to host:port from local side. | |
2820 | */ | |
8efc0c15 | 2821 | |
42ea6f5e | 2822 | int |
3867aa0a | 2823 | channel_request_remote_forwarding(const char *listen_host, u_short listen_port, |
fa08c86b | 2824 | const char *host_to_connect, u_short port_to_connect) |
8efc0c15 | 2825 | { |
54a5250f | 2826 | int type, success = 0; |
fa08c86b | 2827 | |
5260325f | 2828 | /* Record locally that connection to this host/port is permitted. */ |
2829 | if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
2830 | fatal("channel_request_remote_forwarding: too many forwards"); | |
2831 | ||
5260325f | 2832 | /* Send the forward request to the remote side. */ |
7e7327a1 | 2833 | if (compat20) { |
3867aa0a | 2834 | const char *address_to_bind; |
04efe9b0 | 2835 | if (listen_host == NULL) { |
2836 | if (datafellows & SSH_BUG_RFWD_ADDR) | |
2837 | address_to_bind = "127.0.0.1"; | |
2838 | else | |
2839 | address_to_bind = "localhost"; | |
2840 | } else if (*listen_host == '\0' || | |
2841 | strcmp(listen_host, "*") == 0) { | |
2842 | if (datafellows & SSH_BUG_RFWD_ADDR) | |
2843 | address_to_bind = "0.0.0.0"; | |
2844 | else | |
2845 | address_to_bind = ""; | |
2846 | } else | |
3867aa0a | 2847 | address_to_bind = listen_host; |
2848 | ||
7e7327a1 | 2849 | packet_start(SSH2_MSG_GLOBAL_REQUEST); |
2850 | packet_put_cstring("tcpip-forward"); | |
e0ae8728 | 2851 | packet_put_char(1); /* boolean: want reply */ |
7e7327a1 | 2852 | packet_put_cstring(address_to_bind); |
2853 | packet_put_int(listen_port); | |
fa08c86b | 2854 | packet_send(); |
2855 | packet_write_wait(); | |
2856 | /* Assume that server accepts the request */ | |
2857 | success = 1; | |
7e7327a1 | 2858 | } else { |
2859 | packet_start(SSH_CMSG_PORT_FORWARD_REQUEST); | |
7e7327a1 | 2860 | packet_put_int(listen_port); |
d6f24e45 | 2861 | packet_put_cstring(host_to_connect); |
2862 | packet_put_int(port_to_connect); | |
7e7327a1 | 2863 | packet_send(); |
2864 | packet_write_wait(); | |
fa08c86b | 2865 | |
2866 | /* Wait for response from the remote side. */ | |
54a5250f | 2867 | type = packet_read(); |
fa08c86b | 2868 | switch (type) { |
2869 | case SSH_SMSG_SUCCESS: | |
2870 | success = 1; | |
2871 | break; | |
2872 | case SSH_SMSG_FAILURE: | |
fa08c86b | 2873 | break; |
2874 | default: | |
2875 | /* Unknown packet */ | |
2876 | packet_disconnect("Protocol error for port forward request:" | |
2877 | "received packet type %d.", type); | |
2878 | } | |
2879 | } | |
2880 | if (success) { | |
2881 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host_to_connect); | |
2882 | permitted_opens[num_permitted_opens].port_to_connect = port_to_connect; | |
2883 | permitted_opens[num_permitted_opens].listen_port = listen_port; | |
2884 | num_permitted_opens++; | |
7e7327a1 | 2885 | } |
42ea6f5e | 2886 | return (success ? 0 : -1); |
8efc0c15 | 2887 | } |
2888 | ||
d740ec16 | 2889 | /* |
f2107e97 | 2890 | * Request cancellation of remote forwarding of connection host:port from |
d740ec16 | 2891 | * local side. |
2892 | */ | |
d740ec16 | 2893 | void |
3867aa0a | 2894 | channel_request_rforward_cancel(const char *host, u_short port) |
d740ec16 | 2895 | { |
2896 | int i; | |
d740ec16 | 2897 | |
2898 | if (!compat20) | |
2899 | return; | |
2900 | ||
2901 | for (i = 0; i < num_permitted_opens; i++) { | |
f2107e97 | 2902 | if (permitted_opens[i].host_to_connect != NULL && |
d740ec16 | 2903 | permitted_opens[i].listen_port == port) |
2904 | break; | |
2905 | } | |
2906 | if (i >= num_permitted_opens) { | |
2907 | debug("%s: requested forward not found", __func__); | |
2908 | return; | |
2909 | } | |
2910 | packet_start(SSH2_MSG_GLOBAL_REQUEST); | |
2911 | packet_put_cstring("cancel-tcpip-forward"); | |
2912 | packet_put_char(0); | |
3867aa0a | 2913 | packet_put_cstring(host == NULL ? "" : host); |
d740ec16 | 2914 | packet_put_int(port); |
2915 | packet_send(); | |
2916 | ||
2917 | permitted_opens[i].listen_port = 0; | |
2918 | permitted_opens[i].port_to_connect = 0; | |
8c4bd764 | 2919 | xfree(permitted_opens[i].host_to_connect); |
d740ec16 | 2920 | permitted_opens[i].host_to_connect = NULL; |
2921 | } | |
2922 | ||
aa3378df | 2923 | /* |
2924 | * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates | |
2925 | * listening for the port, and sends back a success reply (or disconnect | |
42ea6f5e | 2926 | * message if there was an error). |
aa3378df | 2927 | */ |
42ea6f5e | 2928 | int |
1d1ffb87 | 2929 | channel_input_port_forward_request(int is_root, int gateway_ports) |
8efc0c15 | 2930 | { |
57112b5a | 2931 | u_short port, host_port; |
42ea6f5e | 2932 | int success = 0; |
5260325f | 2933 | char *hostname; |
2934 | ||
2935 | /* Get arguments from the packet. */ | |
2936 | port = packet_get_int(); | |
2937 | hostname = packet_get_string(NULL); | |
2938 | host_port = packet_get_int(); | |
2939 | ||
3c62e7eb | 2940 | #ifndef HAVE_CYGWIN |
aa3378df | 2941 | /* |
2942 | * Check that an unprivileged user is not trying to forward a | |
2943 | * privileged port. | |
2944 | */ | |
5260325f | 2945 | if (port < IPPORT_RESERVED && !is_root) |
8e7c9afc | 2946 | packet_disconnect( |
2947 | "Requested forwarding of port %d but user is not root.", | |
2948 | port); | |
2949 | if (host_port == 0) | |
2950 | packet_disconnect("Dynamic forwarding denied."); | |
3c62e7eb | 2951 | #endif |
8e7c9afc | 2952 | |
fa08c86b | 2953 | /* Initiate forwarding */ |
42ea6f5e | 2954 | success = channel_setup_local_fwd_listener(NULL, port, hostname, |
3867aa0a | 2955 | host_port, gateway_ports); |
5260325f | 2956 | |
2957 | /* Free the argument string. */ | |
2958 | xfree(hostname); | |
42ea6f5e | 2959 | |
2960 | return (success ? 0 : -1); | |
8efc0c15 | 2961 | } |
2962 | ||
01794848 | 2963 | /* |
2964 | * Permits opening to any host/port if permitted_opens[] is empty. This is | |
2965 | * usually called by the server, because the user could connect to any port | |
2966 | * anyway, and the server has no way to know but to trust the client anyway. | |
2967 | */ | |
2968 | void | |
d5bb9418 | 2969 | channel_permit_all_opens(void) |
01794848 | 2970 | { |
2971 | if (num_permitted_opens == 0) | |
2972 | all_opens_permitted = 1; | |
2973 | } | |
2974 | ||
cd332296 | 2975 | void |
01794848 | 2976 | channel_add_permitted_opens(char *host, int port) |
2977 | { | |
2978 | if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
42ea6f5e | 2979 | fatal("channel_add_permitted_opens: too many forwards"); |
01794848 | 2980 | debug("allow port forwarding to host %s port %d", host, port); |
2981 | ||
2982 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host); | |
2983 | permitted_opens[num_permitted_opens].port_to_connect = port; | |
2984 | num_permitted_opens++; | |
2985 | ||
2986 | all_opens_permitted = 0; | |
2987 | } | |
2988 | ||
ea46e550 | 2989 | int |
2fefbadf | 2990 | channel_add_adm_permitted_opens(char *host, int port) |
2991 | { | |
2992 | if (num_adm_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
2993 | fatal("channel_add_adm_permitted_opens: too many forwards"); | |
ea46e550 | 2994 | debug("config allows port forwarding to host %s port %d", host, port); |
2fefbadf | 2995 | |
2996 | permitted_adm_opens[num_adm_permitted_opens].host_to_connect | |
2997 | = xstrdup(host); | |
2998 | permitted_adm_opens[num_adm_permitted_opens].port_to_connect = port; | |
ea46e550 | 2999 | return ++num_adm_permitted_opens; |
2fefbadf | 3000 | } |
3001 | ||
cd332296 | 3002 | void |
01794848 | 3003 | channel_clear_permitted_opens(void) |
3004 | { | |
3005 | int i; | |
3006 | ||
3007 | for (i = 0; i < num_permitted_opens; i++) | |
d740ec16 | 3008 | if (permitted_opens[i].host_to_connect != NULL) |
3009 | xfree(permitted_opens[i].host_to_connect); | |
01794848 | 3010 | num_permitted_opens = 0; |
2fefbadf | 3011 | } |
3012 | ||
3013 | void | |
3014 | channel_clear_adm_permitted_opens(void) | |
3015 | { | |
3016 | int i; | |
01794848 | 3017 | |
2fefbadf | 3018 | for (i = 0; i < num_adm_permitted_opens; i++) |
3019 | if (permitted_adm_opens[i].host_to_connect != NULL) | |
3020 | xfree(permitted_adm_opens[i].host_to_connect); | |
3021 | num_adm_permitted_opens = 0; | |
01794848 | 3022 | } |
3023 | ||
1760c982 | 3024 | void |
3025 | channel_print_adm_permitted_opens(void) | |
3026 | { | |
cdfbc829 | 3027 | int i; |
1760c982 | 3028 | |
68405671 | 3029 | printf("permitopen"); |
861e9e53 | 3030 | if (num_adm_permitted_opens == 0) { |
68405671 | 3031 | printf(" any\n"); |
861e9e53 | 3032 | return; |
3033 | } | |
1760c982 | 3034 | for (i = 0; i < num_adm_permitted_opens; i++) |
3035 | if (permitted_adm_opens[i].host_to_connect != NULL) | |
3036 | printf(" %s:%d", permitted_adm_opens[i].host_to_connect, | |
3037 | permitted_adm_opens[i].port_to_connect); | |
68405671 | 3038 | printf("\n"); |
1760c982 | 3039 | } |
3040 | ||
e07e21ad | 3041 | /* Try to start non-blocking connect to next host in cctx list */ |
396c147e | 3042 | static int |
e07e21ad | 3043 | connect_next(struct channel_connect *cctx) |
8efc0c15 | 3044 | { |
e07e21ad | 3045 | int sock, saved_errno; |
48e671d5 | 3046 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
48e671d5 | 3047 | |
e07e21ad | 3048 | for (; cctx->ai; cctx->ai = cctx->ai->ai_next) { |
3049 | if (cctx->ai->ai_family != AF_INET && | |
3050 | cctx->ai->ai_family != AF_INET6) | |
48e671d5 | 3051 | continue; |
e07e21ad | 3052 | if (getnameinfo(cctx->ai->ai_addr, cctx->ai->ai_addrlen, |
3053 | ntop, sizeof(ntop), strport, sizeof(strport), | |
3054 | NI_NUMERICHOST|NI_NUMERICSERV) != 0) { | |
3055 | error("connect_next: getnameinfo failed"); | |
48e671d5 | 3056 | continue; |
5260325f | 3057 | } |
16d64584 | 3058 | if ((sock = socket(cctx->ai->ai_family, cctx->ai->ai_socktype, |
3059 | cctx->ai->ai_protocol)) == -1) { | |
e07e21ad | 3060 | if (cctx->ai->ai_next == NULL) |
4940c411 | 3061 | error("socket: %.100s", strerror(errno)); |
3062 | else | |
3063 | verbose("socket: %.100s", strerror(errno)); | |
48e671d5 | 3064 | continue; |
5260325f | 3065 | } |
170694d7 | 3066 | if (set_nonblock(sock) == -1) |
3067 | fatal("%s: set_nonblock(%d)", __func__, sock); | |
e07e21ad | 3068 | if (connect(sock, cctx->ai->ai_addr, |
3069 | cctx->ai->ai_addrlen) == -1 && errno != EINPROGRESS) { | |
3070 | debug("connect_next: host %.100s ([%.100s]:%s): " | |
3071 | "%.100s", cctx->host, ntop, strport, | |
48e671d5 | 3072 | strerror(errno)); |
e07e21ad | 3073 | saved_errno = errno; |
48e671d5 | 3074 | close(sock); |
e07e21ad | 3075 | errno = saved_errno; |
2b87da3b | 3076 | continue; /* fail -- try next */ |
48e671d5 | 3077 | } |
e07e21ad | 3078 | debug("connect_next: host %.100s ([%.100s]:%s) " |
3079 | "in progress, fd=%d", cctx->host, ntop, strport, sock); | |
3080 | cctx->ai = cctx->ai->ai_next; | |
3081 | set_nodelay(sock); | |
3082 | return sock; | |
3083 | } | |
3084 | return -1; | |
3085 | } | |
3086 | ||
3087 | static void | |
3088 | channel_connect_ctx_free(struct channel_connect *cctx) | |
3089 | { | |
3090 | xfree(cctx->host); | |
3091 | if (cctx->aitop) | |
3092 | freeaddrinfo(cctx->aitop); | |
3093 | bzero(cctx, sizeof(*cctx)); | |
3094 | cctx->host = NULL; | |
3095 | cctx->ai = cctx->aitop = NULL; | |
3096 | } | |
3097 | ||
3098 | /* Return CONNECTING channel to remote host, port */ | |
3099 | static Channel * | |
3100 | connect_to(const char *host, u_short port, char *ctype, char *rname) | |
3101 | { | |
3102 | struct addrinfo hints; | |
3103 | int gaierr; | |
3104 | int sock = -1; | |
3105 | char strport[NI_MAXSERV]; | |
3106 | struct channel_connect cctx; | |
3107 | Channel *c; | |
5260325f | 3108 | |
267d5589 | 3109 | memset(&cctx, 0, sizeof(cctx)); |
e07e21ad | 3110 | memset(&hints, 0, sizeof(hints)); |
3111 | hints.ai_family = IPv4or6; | |
3112 | hints.ai_socktype = SOCK_STREAM; | |
3113 | snprintf(strport, sizeof strport, "%d", port); | |
3114 | if ((gaierr = getaddrinfo(host, strport, &hints, &cctx.aitop)) != 0) { | |
3115 | error("connect_to %.100s: unknown host (%s)", host, | |
3116 | ssh_gai_strerror(gaierr)); | |
3117 | return NULL; | |
5260325f | 3118 | } |
e07e21ad | 3119 | |
3120 | cctx.host = xstrdup(host); | |
3121 | cctx.port = port; | |
3122 | cctx.ai = cctx.aitop; | |
3123 | ||
3124 | if ((sock = connect_next(&cctx)) == -1) { | |
3125 | error("connect to %.100s port %d failed: %s", | |
3126 | host, port, strerror(errno)); | |
3127 | channel_connect_ctx_free(&cctx); | |
3128 | return NULL; | |
8efc0c15 | 3129 | } |
e07e21ad | 3130 | c = channel_new(ctype, SSH_CHANNEL_CONNECTING, sock, sock, -1, |
3131 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, rname, 1); | |
3132 | c->connect_ctx = cctx; | |
3133 | return c; | |
7368a6c8 | 3134 | } |
01794848 | 3135 | |
e07e21ad | 3136 | Channel * |
3137 | channel_connect_by_listen_address(u_short listen_port, char *ctype, char *rname) | |
fa08c86b | 3138 | { |
3139 | int i; | |
01794848 | 3140 | |
e07e21ad | 3141 | for (i = 0; i < num_permitted_opens; i++) { |
d740ec16 | 3142 | if (permitted_opens[i].host_to_connect != NULL && |
e07e21ad | 3143 | permitted_opens[i].listen_port == listen_port) { |
01794848 | 3144 | return connect_to( |
fa08c86b | 3145 | permitted_opens[i].host_to_connect, |
e07e21ad | 3146 | permitted_opens[i].port_to_connect, ctype, rname); |
3147 | } | |
3148 | } | |
0b6fbf03 | 3149 | error("WARNING: Server requests forwarding for unknown listen_port %d", |
3150 | listen_port); | |
e07e21ad | 3151 | return NULL; |
fa08c86b | 3152 | } |
48e671d5 | 3153 | |
01794848 | 3154 | /* Check if connecting to that port is permitted and connect. */ |
e07e21ad | 3155 | Channel * |
3156 | channel_connect_to(const char *host, u_short port, char *ctype, char *rname) | |
01794848 | 3157 | { |
2fefbadf | 3158 | int i, permit, permit_adm = 1; |
01794848 | 3159 | |
3160 | permit = all_opens_permitted; | |
3161 | if (!permit) { | |
3162 | for (i = 0; i < num_permitted_opens; i++) | |
d740ec16 | 3163 | if (permitted_opens[i].host_to_connect != NULL && |
3164 | permitted_opens[i].port_to_connect == port && | |
01794848 | 3165 | strcmp(permitted_opens[i].host_to_connect, host) == 0) |
3166 | permit = 1; | |
2fefbadf | 3167 | } |
01794848 | 3168 | |
2fefbadf | 3169 | if (num_adm_permitted_opens > 0) { |
3170 | permit_adm = 0; | |
3171 | for (i = 0; i < num_adm_permitted_opens; i++) | |
3172 | if (permitted_adm_opens[i].host_to_connect != NULL && | |
3173 | permitted_adm_opens[i].port_to_connect == port && | |
3174 | strcmp(permitted_adm_opens[i].host_to_connect, host) | |
3175 | == 0) | |
3176 | permit_adm = 1; | |
01794848 | 3177 | } |
2fefbadf | 3178 | |
3179 | if (!permit || !permit_adm) { | |
bbe88b6d | 3180 | logit("Received request to connect to host %.100s port %d, " |
01794848 | 3181 | "but the request was denied.", host, port); |
e07e21ad | 3182 | return NULL; |
01794848 | 3183 | } |
e07e21ad | 3184 | return connect_to(host, port, ctype, rname); |
01794848 | 3185 | } |
3186 | ||
5e96b616 | 3187 | void |
3188 | channel_send_window_changes(void) | |
3189 | { | |
9a995072 | 3190 | u_int i; |
5e96b616 | 3191 | struct winsize ws; |
3192 | ||
3193 | for (i = 0; i < channels_alloc; i++) { | |
f8cc7664 | 3194 | if (channels[i] == NULL || !channels[i]->client_tty || |
5e96b616 | 3195 | channels[i]->type != SSH_CHANNEL_OPEN) |
3196 | continue; | |
3197 | if (ioctl(channels[i]->rfd, TIOCGWINSZ, &ws) < 0) | |
3198 | continue; | |
3199 | channel_request_start(i, "window-change", 0); | |
148de80c | 3200 | packet_put_int((u_int)ws.ws_col); |
3201 | packet_put_int((u_int)ws.ws_row); | |
3202 | packet_put_int((u_int)ws.ws_xpixel); | |
3203 | packet_put_int((u_int)ws.ws_ypixel); | |
5e96b616 | 3204 | packet_send(); |
3205 | } | |
3206 | } | |
3207 | ||
8e7895b8 | 3208 | /* -- X11 forwarding */ |
8efc0c15 | 3209 | |
aa3378df | 3210 | /* |
3211 | * Creates an internet domain socket for listening for X11 connections. | |
57f228e8 | 3212 | * Returns 0 and a suitable display number for the DISPLAY variable |
3213 | * stored in display_numberp , or -1 if an error occurs. | |
aa3378df | 3214 | */ |
c9d0ad9b | 3215 | int |
e6e573bd | 3216 | x11_create_display_inet(int x11_display_offset, int x11_use_localhost, |
d08341e6 | 3217 | int single_connection, u_int *display_numberp, int **chanids) |
8efc0c15 | 3218 | { |
ac151b18 | 3219 | Channel *nc = NULL; |
57112b5a | 3220 | int display_number, sock; |
3221 | u_short port; | |
48e671d5 | 3222 | struct addrinfo hints, *ai, *aitop; |
3223 | char strport[NI_MAXSERV]; | |
3224 | int gaierr, n, num_socks = 0, socks[NUM_SOCKS]; | |
5260325f | 3225 | |
59e5aff5 | 3226 | if (chanids == NULL) |
3227 | return -1; | |
3228 | ||
95f1eccc | 3229 | for (display_number = x11_display_offset; |
184eed6a | 3230 | display_number < MAX_DISPLAYS; |
3231 | display_number++) { | |
5260325f | 3232 | port = 6000 + display_number; |
48e671d5 | 3233 | memset(&hints, 0, sizeof(hints)); |
3234 | hints.ai_family = IPv4or6; | |
e6e573bd | 3235 | hints.ai_flags = x11_use_localhost ? 0: AI_PASSIVE; |
48e671d5 | 3236 | hints.ai_socktype = SOCK_STREAM; |
3237 | snprintf(strport, sizeof strport, "%d", port); | |
3238 | if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) { | |
bb4626fe | 3239 | error("getaddrinfo: %.100s", ssh_gai_strerror(gaierr)); |
c9d0ad9b | 3240 | return -1; |
5260325f | 3241 | } |
48e671d5 | 3242 | for (ai = aitop; ai; ai = ai->ai_next) { |
3243 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
3244 | continue; | |
16d64584 | 3245 | sock = socket(ai->ai_family, ai->ai_socktype, |
3246 | ai->ai_protocol); | |
48e671d5 | 3247 | if (sock < 0) { |
4ee81249 | 3248 | if ((errno != EINVAL) && (errno != EAFNOSUPPORT)) { |
80a44451 | 3249 | error("socket: %.100s", strerror(errno)); |
0ea89f7e | 3250 | freeaddrinfo(aitop); |
c9d0ad9b | 3251 | return -1; |
80a44451 | 3252 | } else { |
22d89d24 | 3253 | debug("x11_create_display_inet: Socket family %d not supported", |
3254 | ai->ai_family); | |
80a44451 | 3255 | continue; |
3256 | } | |
48e671d5 | 3257 | } |
4e1082aa | 3258 | if (ai->ai_family == AF_INET6) |
3259 | sock_set_v6only(sock); | |
554ebbed | 3260 | if (x11_use_localhost) |
3261 | channel_set_reuseaddr(sock); | |
48e671d5 | 3262 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { |
d7ac5f18 | 3263 | debug2("bind port %d: %.100s", port, strerror(errno)); |
48e671d5 | 3264 | close(sock); |
16218745 | 3265 | |
48e671d5 | 3266 | for (n = 0; n < num_socks; n++) { |
48e671d5 | 3267 | close(socks[n]); |
3268 | } | |
3269 | num_socks = 0; | |
3270 | break; | |
3271 | } | |
3272 | socks[num_socks++] = sock; | |
3273 | if (num_socks == NUM_SOCKS) | |
3274 | break; | |
5260325f | 3275 | } |
4ccb01d6 | 3276 | freeaddrinfo(aitop); |
48e671d5 | 3277 | if (num_socks > 0) |
3278 | break; | |
5260325f | 3279 | } |
3280 | if (display_number >= MAX_DISPLAYS) { | |
3281 | error("Failed to allocate internet-domain X11 display socket."); | |
c9d0ad9b | 3282 | return -1; |
8efc0c15 | 3283 | } |
5260325f | 3284 | /* Start listening for connections on the socket. */ |
48e671d5 | 3285 | for (n = 0; n < num_socks; n++) { |
3286 | sock = socks[n]; | |
fce39749 | 3287 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { |
48e671d5 | 3288 | error("listen: %.100s", strerror(errno)); |
48e671d5 | 3289 | close(sock); |
c9d0ad9b | 3290 | return -1; |
a7effaac | 3291 | } |
a7effaac | 3292 | } |
5260325f | 3293 | |
48e671d5 | 3294 | /* Allocate a channel for each socket. */ |
52e3daed | 3295 | *chanids = xcalloc(num_socks + 1, sizeof(**chanids)); |
48e671d5 | 3296 | for (n = 0; n < num_socks; n++) { |
3297 | sock = socks[n]; | |
ac151b18 | 3298 | nc = channel_new("x11 listener", |
0b242b12 | 3299 | SSH_CHANNEL_X11_LISTENER, sock, sock, -1, |
3300 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, | |
0d942eff | 3301 | 0, "X11 inet listener", 1); |
3a0d3d54 | 3302 | nc->single_connection = single_connection; |
59e5aff5 | 3303 | (*chanids)[n] = nc->self; |
48e671d5 | 3304 | } |
59e5aff5 | 3305 | (*chanids)[n] = -1; |
5260325f | 3306 | |
c9d0ad9b | 3307 | /* Return the display number for the DISPLAY environment variable. */ |
57f228e8 | 3308 | *display_numberp = display_number; |
3309 | return (0); | |
8efc0c15 | 3310 | } |
3311 | ||
396c147e | 3312 | static int |
b5a1596f | 3313 | connect_local_xsocket_path(const char *pathname) |
8efc0c15 | 3314 | { |
5260325f | 3315 | int sock; |
3316 | struct sockaddr_un addr; | |
5260325f | 3317 | |
805e659f | 3318 | sock = socket(AF_UNIX, SOCK_STREAM, 0); |
3319 | if (sock < 0) | |
3320 | error("socket: %.100s", strerror(errno)); | |
3321 | memset(&addr, 0, sizeof(addr)); | |
3322 | addr.sun_family = AF_UNIX; | |
b5a1596f | 3323 | strlcpy(addr.sun_path, pathname, sizeof addr.sun_path); |
32596c7b | 3324 | if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) == 0) |
805e659f | 3325 | return sock; |
3326 | close(sock); | |
5260325f | 3327 | error("connect %.100s: %.100s", addr.sun_path, strerror(errno)); |
3328 | return -1; | |
8efc0c15 | 3329 | } |
3330 | ||
b5a1596f | 3331 | static int |
3332 | connect_local_xsocket(u_int dnr) | |
3333 | { | |
3334 | char buf[1024]; | |
3335 | snprintf(buf, sizeof buf, _PATH_UNIX_X, dnr); | |
3336 | return connect_local_xsocket_path(buf); | |
3337 | } | |
3338 | ||
0b242b12 | 3339 | int |
3340 | x11_connect_display(void) | |
8efc0c15 | 3341 | { |
4f16046f | 3342 | u_int display_number; |
5260325f | 3343 | const char *display; |
0b242b12 | 3344 | char buf[1024], *cp; |
48e671d5 | 3345 | struct addrinfo hints, *ai, *aitop; |
3346 | char strport[NI_MAXSERV]; | |
4f16046f | 3347 | int gaierr, sock = 0; |
5260325f | 3348 | |
5260325f | 3349 | /* Try to open a socket for the local X server. */ |
3350 | display = getenv("DISPLAY"); | |
3351 | if (!display) { | |
3352 | error("DISPLAY not set."); | |
0b242b12 | 3353 | return -1; |
5260325f | 3354 | } |
aa3378df | 3355 | /* |
3356 | * Now we decode the value of the DISPLAY variable and make a | |
3357 | * connection to the real X server. | |
3358 | */ | |
3359 | ||
b5a1596f | 3360 | /* Check if the display is from launchd. */ |
3361 | #ifdef __APPLE__ | |
3362 | if (strncmp(display, "/tmp/launch", 11) == 0) { | |
3363 | sock = connect_local_xsocket_path(display); | |
3364 | if (sock < 0) | |
3365 | return -1; | |
3366 | ||
3367 | /* OK, we now have a connection to the display. */ | |
3368 | return sock; | |
3369 | } | |
3370 | #endif | |
aa3378df | 3371 | /* |
3372 | * Check if it is a unix domain socket. Unix domain displays are in | |
3373 | * one of the following formats: unix:d[.s], :d[.s], ::d[.s] | |
3374 | */ | |
5260325f | 3375 | if (strncmp(display, "unix:", 5) == 0 || |
3376 | display[0] == ':') { | |
3377 | /* Connect to the unix domain socket. */ | |
4f16046f | 3378 | if (sscanf(strrchr(display, ':') + 1, "%u", &display_number) != 1) { |
5260325f | 3379 | error("Could not parse display number from DISPLAY: %.100s", |
184eed6a | 3380 | display); |
0b242b12 | 3381 | return -1; |
5260325f | 3382 | } |
3383 | /* Create a socket. */ | |
3384 | sock = connect_local_xsocket(display_number); | |
3385 | if (sock < 0) | |
0b242b12 | 3386 | return -1; |
5260325f | 3387 | |
3388 | /* OK, we now have a connection to the display. */ | |
0b242b12 | 3389 | return sock; |
5260325f | 3390 | } |
aa3378df | 3391 | /* |
3392 | * Connect to an inet socket. The DISPLAY value is supposedly | |
3393 | * hostname:d[.s], where hostname may also be numeric IP address. | |
3394 | */ | |
74860245 | 3395 | strlcpy(buf, display, sizeof(buf)); |
5260325f | 3396 | cp = strchr(buf, ':'); |
3397 | if (!cp) { | |
3398 | error("Could not find ':' in DISPLAY: %.100s", display); | |
0b242b12 | 3399 | return -1; |
5260325f | 3400 | } |
3401 | *cp = 0; | |
aa3378df | 3402 | /* buf now contains the host name. But first we parse the display number. */ |
4f16046f | 3403 | if (sscanf(cp + 1, "%u", &display_number) != 1) { |
5260325f | 3404 | error("Could not parse display number from DISPLAY: %.100s", |
184eed6a | 3405 | display); |
0b242b12 | 3406 | return -1; |
5260325f | 3407 | } |
5260325f | 3408 | |
48e671d5 | 3409 | /* Look up the host address */ |
3410 | memset(&hints, 0, sizeof(hints)); | |
3411 | hints.ai_family = IPv4or6; | |
3412 | hints.ai_socktype = SOCK_STREAM; | |
4f16046f | 3413 | snprintf(strport, sizeof strport, "%u", 6000 + display_number); |
48e671d5 | 3414 | if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) { |
bb4626fe | 3415 | error("%.100s: unknown host. (%s)", buf, |
3416 | ssh_gai_strerror(gaierr)); | |
0b242b12 | 3417 | return -1; |
8efc0c15 | 3418 | } |
48e671d5 | 3419 | for (ai = aitop; ai; ai = ai->ai_next) { |
3420 | /* Create a socket. */ | |
16d64584 | 3421 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
48e671d5 | 3422 | if (sock < 0) { |
d7ac5f18 | 3423 | debug2("socket: %.100s", strerror(errno)); |
7368a6c8 | 3424 | continue; |
3425 | } | |
3426 | /* Connect it to the display. */ | |
3427 | if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) { | |
4f16046f | 3428 | debug2("connect %.100s port %u: %.100s", buf, |
7368a6c8 | 3429 | 6000 + display_number, strerror(errno)); |
3430 | close(sock); | |
3431 | continue; | |
3432 | } | |
3433 | /* Success */ | |
3434 | break; | |
48e671d5 | 3435 | } |
48e671d5 | 3436 | freeaddrinfo(aitop); |
3437 | if (!ai) { | |
4f16046f | 3438 | error("connect %.100s port %u: %.100s", buf, 6000 + display_number, |
48e671d5 | 3439 | strerror(errno)); |
0b242b12 | 3440 | return -1; |
8efc0c15 | 3441 | } |
bcc0381e | 3442 | set_nodelay(sock); |
0b242b12 | 3443 | return sock; |
3444 | } | |
5260325f | 3445 | |
0b242b12 | 3446 | /* |
3447 | * This is called when SSH_SMSG_X11_OPEN is received. The packet contains | |
3448 | * the remote channel number. We should do whatever we want, and respond | |
3449 | * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE. | |
3450 | */ | |
5260325f | 3451 | |
ebb90778 | 3452 | /* ARGSUSED */ |
0b242b12 | 3453 | void |
7819b5c3 | 3454 | x11_input_open(int type, u_int32_t seq, void *ctxt) |
0b242b12 | 3455 | { |
719fc62f | 3456 | Channel *c = NULL; |
3457 | int remote_id, sock = 0; | |
0b242b12 | 3458 | char *remote_host; |
5260325f | 3459 | |
719fc62f | 3460 | debug("Received X11 open request."); |
5260325f | 3461 | |
719fc62f | 3462 | remote_id = packet_get_int(); |
8e7895b8 | 3463 | |
3464 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) { | |
719fc62f | 3465 | remote_host = packet_get_string(NULL); |
0b242b12 | 3466 | } else { |
3467 | remote_host = xstrdup("unknown (remote did not supply name)"); | |
0b242b12 | 3468 | } |
95500969 | 3469 | packet_check_eom(); |
0b242b12 | 3470 | |
3471 | /* Obtain a connection to the real X display. */ | |
3472 | sock = x11_connect_display(); | |
719fc62f | 3473 | if (sock != -1) { |
3474 | /* Allocate a channel for this connection. */ | |
3475 | c = channel_new("connected x11 socket", | |
3476 | SSH_CHANNEL_X11_OPEN, sock, sock, -1, 0, 0, 0, | |
3477 | remote_host, 1); | |
3a0d3d54 | 3478 | c->remote_id = remote_id; |
3479 | c->force_drain = 1; | |
719fc62f | 3480 | } |
0d942eff | 3481 | xfree(remote_host); |
719fc62f | 3482 | if (c == NULL) { |
0b242b12 | 3483 | /* Send refusal to the remote host. */ |
3484 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
719fc62f | 3485 | packet_put_int(remote_id); |
0b242b12 | 3486 | } else { |
0b242b12 | 3487 | /* Send a confirmation to the remote host. */ |
3488 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
719fc62f | 3489 | packet_put_int(remote_id); |
3490 | packet_put_int(c->self); | |
0b242b12 | 3491 | } |
719fc62f | 3492 | packet_send(); |
8efc0c15 | 3493 | } |
3494 | ||
a22aff1f | 3495 | /* dummy protocol handler that denies SSH-1 requests (agent/x11) */ |
ebb90778 | 3496 | /* ARGSUSED */ |
a22aff1f | 3497 | void |
7819b5c3 | 3498 | deny_input_open(int type, u_int32_t seq, void *ctxt) |
a22aff1f | 3499 | { |
3500 | int rchan = packet_get_int(); | |
e1feb9bf | 3501 | |
6aacefa7 | 3502 | switch (type) { |
a22aff1f | 3503 | case SSH_SMSG_AGENT_OPEN: |
3504 | error("Warning: ssh server tried agent forwarding."); | |
3505 | break; | |
3506 | case SSH_SMSG_X11_OPEN: | |
3507 | error("Warning: ssh server tried X11 forwarding."); | |
3508 | break; | |
3509 | default: | |
7819b5c3 | 3510 | error("deny_input_open: type %d", type); |
a22aff1f | 3511 | break; |
3512 | } | |
1908529f | 3513 | error("Warning: this is probably a break-in attempt by a malicious server."); |
a22aff1f | 3514 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
3515 | packet_put_int(rchan); | |
3516 | packet_send(); | |
3517 | } | |
3518 | ||
aa3378df | 3519 | /* |
3520 | * Requests forwarding of X11 connections, generates fake authentication | |
3521 | * data, and enables authentication spoofing. | |
8e7895b8 | 3522 | * This should be called in the client only. |
aa3378df | 3523 | */ |
6ae2364d | 3524 | void |
9bf083eb | 3525 | x11_request_forwarding_with_spoofing(int client_session_id, const char *disp, |
0b242b12 | 3526 | const char *proto, const char *data) |
8efc0c15 | 3527 | { |
1e3b8b07 | 3528 | u_int data_len = (u_int) strlen(data) / 2; |
ef07103c | 3529 | u_int i, value; |
5260325f | 3530 | char *new_data; |
3531 | int screen_number; | |
3532 | const char *cp; | |
ca75d7de | 3533 | u_int32_t rnd = 0; |
5260325f | 3534 | |
4297b666 | 3535 | if (x11_saved_display == NULL) |
3536 | x11_saved_display = xstrdup(disp); | |
3537 | else if (strcmp(disp, x11_saved_display) != 0) { | |
ef07103c | 3538 | error("x11_request_forwarding_with_spoofing: different " |
3539 | "$DISPLAY already forwarded"); | |
3540 | return; | |
3541 | } | |
3542 | ||
0875ae22 | 3543 | cp = strchr(disp, ':'); |
5260325f | 3544 | if (cp) |
3545 | cp = strchr(cp, '.'); | |
3546 | if (cp) | |
d6d4897e | 3547 | screen_number = (u_int)strtonum(cp + 1, 0, 400, NULL); |
5260325f | 3548 | else |
3549 | screen_number = 0; | |
3550 | ||
ef07103c | 3551 | if (x11_saved_proto == NULL) { |
3552 | /* Save protocol name. */ | |
3553 | x11_saved_proto = xstrdup(proto); | |
3554 | /* | |
56964485 | 3555 | * Extract real authentication data and generate fake data |
ef07103c | 3556 | * of the same length. |
3557 | */ | |
3558 | x11_saved_data = xmalloc(data_len); | |
3559 | x11_fake_data = xmalloc(data_len); | |
3560 | for (i = 0; i < data_len; i++) { | |
3561 | if (sscanf(data + 2 * i, "%2x", &value) != 1) | |
3562 | fatal("x11_request_forwarding: bad " | |
3563 | "authentication data: %.100s", data); | |
3564 | if (i % 4 == 0) | |
3565 | rnd = arc4random(); | |
3566 | x11_saved_data[i] = value; | |
3567 | x11_fake_data[i] = rnd & 0xff; | |
3568 | rnd >>= 8; | |
3569 | } | |
3570 | x11_saved_data_len = data_len; | |
3571 | x11_fake_data_len = data_len; | |
3572 | } | |
5260325f | 3573 | |
3574 | /* Convert the fake data into hex. */ | |
ef07103c | 3575 | new_data = tohex(x11_fake_data, data_len); |
5260325f | 3576 | |
3577 | /* Send the request packet. */ | |
0b242b12 | 3578 | if (compat20) { |
3579 | channel_request_start(client_session_id, "x11-req", 0); | |
3580 | packet_put_char(0); /* XXX bool single connection */ | |
3581 | } else { | |
3582 | packet_start(SSH_CMSG_X11_REQUEST_FORWARDING); | |
3583 | } | |
3584 | packet_put_cstring(proto); | |
3585 | packet_put_cstring(new_data); | |
5260325f | 3586 | packet_put_int(screen_number); |
3587 | packet_send(); | |
3588 | packet_write_wait(); | |
3589 | xfree(new_data); | |
8efc0c15 | 3590 | } |
3591 | ||
8e7895b8 | 3592 | |
3593 | /* -- agent forwarding */ | |
3594 | ||
8efc0c15 | 3595 | /* Sends a message to the server to request authentication fd forwarding. */ |
3596 | ||
6ae2364d | 3597 | void |
d5bb9418 | 3598 | auth_request_forwarding(void) |
8efc0c15 | 3599 | { |
5260325f | 3600 | packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING); |
3601 | packet_send(); | |
3602 | packet_write_wait(); | |
8efc0c15 | 3603 | } |