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16d64584 | 1 | /* $OpenBSD: channels.c,v 1.300 2010/01/09 23:04:13 dtucker Exp $ */ |
8efc0c15 | 2 | /* |
5260325f | 3 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
5260325f | 4 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
5 | * All rights reserved | |
5260325f | 6 | * This file contains functions for generic socket connection forwarding. |
7 | * There is also code for initiating connection forwarding for X11 connections, | |
8 | * arbitrary tcp/ip connections, and the authentication agent connection. | |
6ae2364d | 9 | * |
bcbf86ec | 10 | * As far as I am concerned, the code I have written for this software |
11 | * can be used freely for any purpose. Any derived versions of this | |
12 | * software must be clearly marked as such, and if the derived work is | |
13 | * incompatible with the protocol description in the RFC file, it must be | |
14 | * called by a name other than "ssh" or "Secure Shell". | |
15 | * | |
7e7327a1 | 16 | * SSH2 support added by Markus Friedl. |
8341f420 | 17 | * Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved. |
bcbf86ec | 18 | * Copyright (c) 1999 Dug Song. All rights reserved. |
19 | * Copyright (c) 1999 Theo de Raadt. All rights reserved. | |
20 | * | |
21 | * Redistribution and use in source and binary forms, with or without | |
22 | * modification, are permitted provided that the following conditions | |
23 | * are met: | |
24 | * 1. Redistributions of source code must retain the above copyright | |
25 | * notice, this list of conditions and the following disclaimer. | |
26 | * 2. Redistributions in binary form must reproduce the above copyright | |
27 | * notice, this list of conditions and the following disclaimer in the | |
28 | * documentation and/or other materials provided with the distribution. | |
29 | * | |
30 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
31 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
32 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
33 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
34 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
35 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
36 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
37 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
38 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
39 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
5260325f | 40 | */ |
8efc0c15 | 41 | |
42 | #include "includes.h" | |
bd7c69ea | 43 | |
cebb4c24 | 44 | #include <sys/types.h> |
31652869 | 45 | #include <sys/ioctl.h> |
cebb4c24 | 46 | #include <sys/un.h> |
319d6b41 | 47 | #include <sys/socket.h> |
e264ac72 | 48 | #ifdef HAVE_SYS_TIME_H |
49 | # include <sys/time.h> | |
50 | #endif | |
319d6b41 | 51 | |
52 | #include <netinet/in.h> | |
53 | #include <arpa/inet.h> | |
1d3e026f | 54 | |
028094f4 | 55 | #include <errno.h> |
fe5bc072 | 56 | #include <fcntl.h> |
28cb0a43 | 57 | #include <netdb.h> |
cf851879 | 58 | #include <stdio.h> |
ffa517a8 | 59 | #include <stdlib.h> |
00146caa | 60 | #include <string.h> |
1d3e026f | 61 | #include <termios.h> |
5188ba17 | 62 | #include <unistd.h> |
31652869 | 63 | #include <stdarg.h> |
8efc0c15 | 64 | |
3593bdc0 | 65 | #include "openbsd-compat/sys-queue.h" |
31652869 | 66 | #include "xmalloc.h" |
8efc0c15 | 67 | #include "ssh.h" |
42f11eb2 | 68 | #include "ssh1.h" |
69 | #include "ssh2.h" | |
8efc0c15 | 70 | #include "packet.h" |
42f11eb2 | 71 | #include "log.h" |
72 | #include "misc.h" | |
31652869 | 73 | #include "buffer.h" |
8efc0c15 | 74 | #include "channels.h" |
8efc0c15 | 75 | #include "compat.h" |
42f11eb2 | 76 | #include "canohost.h" |
4c8722d9 | 77 | #include "key.h" |
78 | #include "authfd.h" | |
805e659f | 79 | #include "pathnames.h" |
8efc0c15 | 80 | |
8e7895b8 | 81 | /* -- channel core */ |
8efc0c15 | 82 | |
aa3378df | 83 | /* |
84 | * Pointer to an array containing all allocated channels. The array is | |
85 | * dynamically extended as needed. | |
86 | */ | |
719fc62f | 87 | static Channel **channels = NULL; |
8efc0c15 | 88 | |
aa3378df | 89 | /* |
90 | * Size of the channel array. All slots of the array must always be | |
719fc62f | 91 | * initialized (at least the type field); unused slots set to NULL |
aa3378df | 92 | */ |
9a995072 | 93 | static u_int channels_alloc = 0; |
8efc0c15 | 94 | |
aa3378df | 95 | /* |
96 | * Maximum file descriptor value used in any of the channels. This is | |
719fc62f | 97 | * updated in channel_new. |
aa3378df | 98 | */ |
39929cdb | 99 | static int channel_max_fd = 0; |
8efc0c15 | 100 | |
8efc0c15 | 101 | |
8e7895b8 | 102 | /* -- tcp forwarding */ |
8efc0c15 | 103 | |
aa3378df | 104 | /* |
105 | * Data structure for storing which hosts are permitted for forward requests. | |
106 | * The local sides of any remote forwards are stored in this array to prevent | |
107 | * a corrupt remote server from accessing arbitrary TCP/IP ports on our local | |
108 | * network (which might be behind a firewall). | |
109 | */ | |
5260325f | 110 | typedef struct { |
7368a6c8 | 111 | char *host_to_connect; /* Connect to 'host'. */ |
112 | u_short port_to_connect; /* Connect to 'port'. */ | |
113 | u_short listen_port; /* Remote side should listen port number. */ | |
8efc0c15 | 114 | } ForwardPermission; |
115 | ||
2fefbadf | 116 | /* List of all permitted host/port pairs to connect by the user. */ |
8efc0c15 | 117 | static ForwardPermission permitted_opens[SSH_MAX_FORWARDS_PER_DIRECTION]; |
8e7895b8 | 118 | |
2fefbadf | 119 | /* List of all permitted host/port pairs to connect by the admin. */ |
120 | static ForwardPermission permitted_adm_opens[SSH_MAX_FORWARDS_PER_DIRECTION]; | |
121 | ||
122 | /* Number of permitted host/port pairs in the array permitted by the user. */ | |
8efc0c15 | 123 | static int num_permitted_opens = 0; |
2fefbadf | 124 | |
125 | /* Number of permitted host/port pair in the array permitted by the admin. */ | |
126 | static int num_adm_permitted_opens = 0; | |
127 | ||
aa3378df | 128 | /* |
129 | * If this is true, all opens are permitted. This is the case on the server | |
130 | * on which we have to trust the client anyway, and the user could do | |
131 | * anything after logging in anyway. | |
132 | */ | |
8efc0c15 | 133 | static int all_opens_permitted = 0; |
134 | ||
8efc0c15 | 135 | |
8e7895b8 | 136 | /* -- X11 forwarding */ |
42f11eb2 | 137 | |
8e7895b8 | 138 | /* Maximum number of fake X11 displays to try. */ |
139 | #define MAX_DISPLAYS 1000 | |
0490e609 | 140 | |
ef07103c | 141 | /* Saved X11 local (client) display. */ |
142 | static char *x11_saved_display = NULL; | |
143 | ||
8e7895b8 | 144 | /* Saved X11 authentication protocol name. */ |
145 | static char *x11_saved_proto = NULL; | |
8efc0c15 | 146 | |
8e7895b8 | 147 | /* Saved X11 authentication data. This is the real data. */ |
148 | static char *x11_saved_data = NULL; | |
149 | static u_int x11_saved_data_len = 0; | |
150 | ||
151 | /* | |
152 | * Fake X11 authentication data. This is what the server will be sending us; | |
153 | * we should replace any occurrences of this by the real data. | |
154 | */ | |
338eb2ab | 155 | static u_char *x11_fake_data = NULL; |
8e7895b8 | 156 | static u_int x11_fake_data_len; |
157 | ||
158 | ||
159 | /* -- agent forwarding */ | |
8efc0c15 | 160 | |
8e7895b8 | 161 | #define NUM_SOCKS 10 |
162 | ||
8e7895b8 | 163 | /* AF_UNSPEC or AF_INET or AF_INET6 */ |
5e4a7219 | 164 | static int IPv4or6 = AF_UNSPEC; |
8e7895b8 | 165 | |
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; | |
5e96b616 | 242 | c->ctl_fd = -1; /* XXX: set elsewhere */ |
0fbe8c74 | 243 | c->efd = efd; |
244 | c->extended_usage = extusage; | |
a22aff1f | 245 | |
b3784859 | 246 | if ((c->isatty = is_tty) != 0) |
d7ac5f18 | 247 | debug2("channel %d: rfd %d isatty", c->self, c->rfd); |
245f4d36 | 248 | c->wfd_isatty = is_tty || isatty(c->wfd); |
0ae4fe1d | 249 | |
a22aff1f | 250 | /* enable nonblocking mode */ |
251 | if (nonblock) { | |
252 | if (rfd != -1) | |
253 | set_nonblock(rfd); | |
254 | if (wfd != -1) | |
255 | set_nonblock(wfd); | |
256 | if (efd != -1) | |
257 | set_nonblock(efd); | |
258 | } | |
0fbe8c74 | 259 | } |
260 | ||
261 | /* | |
262 | * Allocate a new channel object and set its type and socket. This will cause | |
263 | * remote_name to be freed. | |
264 | */ | |
719fc62f | 265 | Channel * |
0fbe8c74 | 266 | channel_new(char *ctype, int type, int rfd, int wfd, int efd, |
f91d9a89 | 267 | u_int window, u_int maxpack, int extusage, char *remote_name, int nonblock) |
0fbe8c74 | 268 | { |
9a995072 | 269 | int found; |
270 | u_int i; | |
0fbe8c74 | 271 | Channel *c; |
5260325f | 272 | |
273 | /* Do initial allocation if this is the first call. */ | |
274 | if (channels_alloc == 0) { | |
275 | channels_alloc = 10; | |
52e3daed | 276 | channels = xcalloc(channels_alloc, sizeof(Channel *)); |
5260325f | 277 | for (i = 0; i < channels_alloc; i++) |
719fc62f | 278 | channels[i] = NULL; |
5260325f | 279 | } |
280 | /* Try to find a free slot where to put the new channel. */ | |
281 | for (found = -1, i = 0; i < channels_alloc; i++) | |
719fc62f | 282 | if (channels[i] == NULL) { |
5260325f | 283 | /* Found a free slot. */ |
9a995072 | 284 | found = (int)i; |
5260325f | 285 | break; |
286 | } | |
9a995072 | 287 | if (found < 0) { |
aa3378df | 288 | /* There are no free slots. Take last+1 slot and expand the array. */ |
5260325f | 289 | found = channels_alloc; |
5df8c731 | 290 | if (channels_alloc > 10000) |
291 | fatal("channel_new: internal error: channels_alloc %d " | |
292 | "too big.", channels_alloc); | |
c5d10563 | 293 | channels = xrealloc(channels, channels_alloc + 10, |
294 | sizeof(Channel *)); | |
20419cc1 | 295 | channels_alloc += 10; |
de273eef | 296 | debug2("channel: expanding %d", channels_alloc); |
5260325f | 297 | for (i = found; i < channels_alloc; i++) |
719fc62f | 298 | channels[i] = NULL; |
5260325f | 299 | } |
719fc62f | 300 | /* Initialize and return new channel. */ |
52e3daed | 301 | c = channels[found] = xcalloc(1, sizeof(Channel)); |
5260325f | 302 | buffer_init(&c->input); |
303 | buffer_init(&c->output); | |
7368a6c8 | 304 | buffer_init(&c->extended); |
1338ba77 | 305 | c->path = NULL; |
70bef40e | 306 | c->ostate = CHAN_OUTPUT_OPEN; |
307 | c->istate = CHAN_INPUT_OPEN; | |
308 | c->flags = 0; | |
c9478090 | 309 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock, 0); |
5260325f | 310 | c->self = found; |
311 | c->type = type; | |
7368a6c8 | 312 | c->ctype = ctype; |
0b242b12 | 313 | c->local_window = window; |
314 | c->local_window_max = window; | |
315 | c->local_consumed = 0; | |
316 | c->local_maxpacket = maxpack; | |
5260325f | 317 | c->remote_id = -1; |
0d942eff | 318 | c->remote_name = xstrdup(remote_name); |
7368a6c8 | 319 | c->remote_window = 0; |
320 | c->remote_maxpacket = 0; | |
a5f82435 | 321 | c->force_drain = 0; |
ac151b18 | 322 | c->single_connection = 0; |
3cf2be58 | 323 | c->detach_user = NULL; |
8cd0437d | 324 | c->detach_close = 0; |
3593bdc0 | 325 | c->open_confirm = NULL; |
326 | c->open_confirm_ctx = NULL; | |
2e73a022 | 327 | c->input_filter = NULL; |
c1c6a032 | 328 | c->output_filter = NULL; |
e74caf1e | 329 | c->filter_ctx = NULL; |
330 | c->filter_cleanup = NULL; | |
7501ed0d | 331 | c->delayed = 1; /* prevent call to channel_post handler */ |
3593bdc0 | 332 | TAILQ_INIT(&c->status_confirms); |
5260325f | 333 | debug("channel %d: new [%s]", found, remote_name); |
719fc62f | 334 | return c; |
7368a6c8 | 335 | } |
8efc0c15 | 336 | |
489aa2e9 | 337 | static int |
338 | channel_find_maxfd(void) | |
339 | { | |
9a995072 | 340 | u_int i; |
341 | int max = 0; | |
489aa2e9 | 342 | Channel *c; |
343 | ||
344 | for (i = 0; i < channels_alloc; i++) { | |
345 | c = channels[i]; | |
346 | if (c != NULL) { | |
347 | max = MAX(max, c->rfd); | |
348 | max = MAX(max, c->wfd); | |
349 | max = MAX(max, c->efd); | |
350 | } | |
351 | } | |
352 | return max; | |
353 | } | |
354 | ||
355 | int | |
356 | channel_close_fd(int *fdp) | |
357 | { | |
358 | int ret = 0, fd = *fdp; | |
359 | ||
360 | if (fd != -1) { | |
361 | ret = close(fd); | |
362 | *fdp = -1; | |
363 | if (fd == channel_max_fd) | |
364 | channel_max_fd = channel_find_maxfd(); | |
365 | } | |
366 | return ret; | |
367 | } | |
368 | ||
0fbe8c74 | 369 | /* Close all channel fd/socket. */ |
396c147e | 370 | static void |
0fbe8c74 | 371 | channel_close_fds(Channel *c) |
372 | { | |
5e96b616 | 373 | debug3("channel %d: close_fds r %d w %d e %d c %d", |
374 | c->self, c->rfd, c->wfd, c->efd, c->ctl_fd); | |
6fd8622b | 375 | |
489aa2e9 | 376 | channel_close_fd(&c->sock); |
5e96b616 | 377 | channel_close_fd(&c->ctl_fd); |
489aa2e9 | 378 | channel_close_fd(&c->rfd); |
379 | channel_close_fd(&c->wfd); | |
380 | channel_close_fd(&c->efd); | |
0fbe8c74 | 381 | } |
382 | ||
8e7895b8 | 383 | /* Free the channel and close its fd/socket. */ |
8e7895b8 | 384 | void |
385 | channel_free(Channel *c) | |
386 | { | |
387 | char *s; | |
9a995072 | 388 | u_int i, n; |
3593bdc0 | 389 | struct channel_confirm *cc; |
8e7895b8 | 390 | |
391 | for (n = 0, i = 0; i < channels_alloc; i++) | |
392 | if (channels[i]) | |
393 | n++; | |
9a995072 | 394 | debug("channel %d: free: %s, nchannels %u", c->self, |
8e7895b8 | 395 | c->remote_name ? c->remote_name : "???", n); |
396 | ||
397 | s = channel_open_message(); | |
d7ac5f18 | 398 | debug3("channel %d: status: %s", c->self, s); |
8e7895b8 | 399 | xfree(s); |
400 | ||
8e7895b8 | 401 | if (c->sock != -1) |
402 | shutdown(c->sock, SHUT_RDWR); | |
5e96b616 | 403 | if (c->ctl_fd != -1) |
404 | shutdown(c->ctl_fd, SHUT_RDWR); | |
8e7895b8 | 405 | channel_close_fds(c); |
406 | buffer_free(&c->input); | |
407 | buffer_free(&c->output); | |
408 | buffer_free(&c->extended); | |
409 | if (c->remote_name) { | |
410 | xfree(c->remote_name); | |
411 | c->remote_name = NULL; | |
412 | } | |
1338ba77 | 413 | if (c->path) { |
414 | xfree(c->path); | |
415 | c->path = NULL; | |
416 | } | |
3593bdc0 | 417 | while ((cc = TAILQ_FIRST(&c->status_confirms)) != NULL) { |
418 | if (cc->abandon_cb != NULL) | |
419 | cc->abandon_cb(c, cc->ctx); | |
420 | TAILQ_REMOVE(&c->status_confirms, cc, entry); | |
421 | bzero(cc, sizeof(*cc)); | |
422 | xfree(cc); | |
423 | } | |
e74caf1e | 424 | if (c->filter_cleanup != NULL && c->filter_ctx != NULL) |
425 | c->filter_cleanup(c->self, c->filter_ctx); | |
8e7895b8 | 426 | channels[c->self] = NULL; |
427 | xfree(c); | |
428 | } | |
429 | ||
8e7895b8 | 430 | void |
d6746a0b | 431 | channel_free_all(void) |
8e7895b8 | 432 | { |
9a995072 | 433 | u_int i; |
8e7895b8 | 434 | |
d6746a0b | 435 | for (i = 0; i < channels_alloc; i++) |
436 | if (channels[i] != NULL) | |
437 | channel_free(channels[i]); | |
8e7895b8 | 438 | } |
439 | ||
440 | /* | |
441 | * Closes the sockets/fds of all channels. This is used to close extra file | |
442 | * descriptors after a fork. | |
443 | */ | |
8e7895b8 | 444 | void |
d5bb9418 | 445 | channel_close_all(void) |
8e7895b8 | 446 | { |
9a995072 | 447 | u_int i; |
8e7895b8 | 448 | |
449 | for (i = 0; i < channels_alloc; i++) | |
450 | if (channels[i] != NULL) | |
451 | channel_close_fds(channels[i]); | |
452 | } | |
453 | ||
3cf2be58 | 454 | /* |
455 | * Stop listening to channels. | |
456 | */ | |
3cf2be58 | 457 | void |
458 | channel_stop_listening(void) | |
459 | { | |
9a995072 | 460 | u_int i; |
3cf2be58 | 461 | Channel *c; |
462 | ||
463 | for (i = 0; i < channels_alloc; i++) { | |
464 | c = channels[i]; | |
465 | if (c != NULL) { | |
466 | switch (c->type) { | |
467 | case SSH_CHANNEL_AUTH_SOCKET: | |
468 | case SSH_CHANNEL_PORT_LISTENER: | |
469 | case SSH_CHANNEL_RPORT_LISTENER: | |
470 | case SSH_CHANNEL_X11_LISTENER: | |
489aa2e9 | 471 | channel_close_fd(&c->sock); |
3cf2be58 | 472 | channel_free(c); |
473 | break; | |
474 | } | |
475 | } | |
476 | } | |
477 | } | |
478 | ||
8e7895b8 | 479 | /* |
480 | * Returns true if no channel has too much buffered data, and false if one or | |
481 | * more channel is overfull. | |
482 | */ | |
8e7895b8 | 483 | int |
d5bb9418 | 484 | channel_not_very_much_buffered_data(void) |
8e7895b8 | 485 | { |
486 | u_int i; | |
487 | Channel *c; | |
488 | ||
489 | for (i = 0; i < channels_alloc; i++) { | |
490 | c = channels[i]; | |
491 | if (c != NULL && c->type == SSH_CHANNEL_OPEN) { | |
0c139bd1 | 492 | #if 0 |
493 | if (!compat20 && | |
494 | buffer_len(&c->input) > packet_get_maxsize()) { | |
faa483fa | 495 | debug2("channel %d: big input buffer %d", |
8e7895b8 | 496 | c->self, buffer_len(&c->input)); |
497 | return 0; | |
498 | } | |
0c139bd1 | 499 | #endif |
8e7895b8 | 500 | if (buffer_len(&c->output) > packet_get_maxsize()) { |
a27002e5 | 501 | debug2("channel %d: big output buffer %u > %u", |
0c139bd1 | 502 | c->self, buffer_len(&c->output), |
503 | packet_get_maxsize()); | |
8e7895b8 | 504 | return 0; |
505 | } | |
506 | } | |
507 | } | |
508 | return 1; | |
509 | } | |
510 | ||
511 | /* Returns true if any channel is still open. */ | |
8e7895b8 | 512 | int |
d5bb9418 | 513 | channel_still_open(void) |
8e7895b8 | 514 | { |
9a995072 | 515 | u_int i; |
8e7895b8 | 516 | Channel *c; |
517 | ||
518 | for (i = 0; i < channels_alloc; i++) { | |
519 | c = channels[i]; | |
520 | if (c == NULL) | |
521 | continue; | |
522 | switch (c->type) { | |
523 | case SSH_CHANNEL_X11_LISTENER: | |
524 | case SSH_CHANNEL_PORT_LISTENER: | |
525 | case SSH_CHANNEL_RPORT_LISTENER: | |
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: | |
539 | return 1; | |
540 | case SSH_CHANNEL_INPUT_DRAINING: | |
541 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
542 | if (!compat13) | |
543 | fatal("cannot happen: OUT_DRAIN"); | |
544 | return 1; | |
545 | default: | |
546 | fatal("channel_still_open: bad channel type %d", c->type); | |
547 | /* NOTREACHED */ | |
548 | } | |
549 | } | |
550 | return 0; | |
551 | } | |
552 | ||
553 | /* Returns the id of an open channel suitable for keepaliving */ | |
8e7895b8 | 554 | int |
d5bb9418 | 555 | channel_find_open(void) |
8e7895b8 | 556 | { |
9a995072 | 557 | u_int i; |
8e7895b8 | 558 | Channel *c; |
559 | ||
560 | for (i = 0; i < channels_alloc; i++) { | |
561 | c = channels[i]; | |
13de3560 | 562 | if (c == NULL || c->remote_id < 0) |
8e7895b8 | 563 | continue; |
564 | switch (c->type) { | |
565 | case SSH_CHANNEL_CLOSED: | |
566 | case SSH_CHANNEL_DYNAMIC: | |
567 | case SSH_CHANNEL_X11_LISTENER: | |
568 | case SSH_CHANNEL_PORT_LISTENER: | |
569 | case SSH_CHANNEL_RPORT_LISTENER: | |
570 | case SSH_CHANNEL_OPENING: | |
571 | case SSH_CHANNEL_CONNECTING: | |
572 | case SSH_CHANNEL_ZOMBIE: | |
573 | continue; | |
574 | case SSH_CHANNEL_LARVAL: | |
575 | case SSH_CHANNEL_AUTH_SOCKET: | |
576 | case SSH_CHANNEL_OPEN: | |
577 | case SSH_CHANNEL_X11_OPEN: | |
578 | return i; | |
579 | case SSH_CHANNEL_INPUT_DRAINING: | |
580 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
581 | if (!compat13) | |
582 | fatal("cannot happen: OUT_DRAIN"); | |
583 | return i; | |
584 | default: | |
585 | fatal("channel_find_open: bad channel type %d", c->type); | |
586 | /* NOTREACHED */ | |
587 | } | |
588 | } | |
589 | return -1; | |
590 | } | |
591 | ||
592 | ||
593 | /* | |
594 | * Returns a message describing the currently open forwarded connections, | |
595 | * suitable for sending to the client. The message contains crlf pairs for | |
596 | * newlines. | |
597 | */ | |
8e7895b8 | 598 | char * |
d5bb9418 | 599 | channel_open_message(void) |
8e7895b8 | 600 | { |
601 | Buffer buffer; | |
602 | Channel *c; | |
603 | char buf[1024], *cp; | |
9a995072 | 604 | u_int i; |
8e7895b8 | 605 | |
606 | buffer_init(&buffer); | |
607 | snprintf(buf, sizeof buf, "The following connections are open:\r\n"); | |
608 | buffer_append(&buffer, buf, strlen(buf)); | |
609 | for (i = 0; i < channels_alloc; i++) { | |
610 | c = channels[i]; | |
611 | if (c == NULL) | |
612 | continue; | |
613 | switch (c->type) { | |
614 | case SSH_CHANNEL_X11_LISTENER: | |
615 | case SSH_CHANNEL_PORT_LISTENER: | |
616 | case SSH_CHANNEL_RPORT_LISTENER: | |
617 | case SSH_CHANNEL_CLOSED: | |
618 | case SSH_CHANNEL_AUTH_SOCKET: | |
619 | case SSH_CHANNEL_ZOMBIE: | |
620 | continue; | |
621 | case SSH_CHANNEL_LARVAL: | |
622 | case SSH_CHANNEL_OPENING: | |
623 | case SSH_CHANNEL_CONNECTING: | |
624 | case SSH_CHANNEL_DYNAMIC: | |
625 | case SSH_CHANNEL_OPEN: | |
626 | case SSH_CHANNEL_X11_OPEN: | |
627 | case SSH_CHANNEL_INPUT_DRAINING: | |
628 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
5e96b616 | 629 | snprintf(buf, sizeof buf, |
630 | " #%d %.300s (t%d r%d i%d/%d o%d/%d fd %d/%d cfd %d)\r\n", | |
8e7895b8 | 631 | c->self, c->remote_name, |
632 | c->type, c->remote_id, | |
633 | c->istate, buffer_len(&c->input), | |
634 | c->ostate, buffer_len(&c->output), | |
5e96b616 | 635 | c->rfd, c->wfd, c->ctl_fd); |
8e7895b8 | 636 | buffer_append(&buffer, buf, strlen(buf)); |
637 | continue; | |
638 | default: | |
639 | fatal("channel_open_message: bad channel type %d", c->type); | |
640 | /* NOTREACHED */ | |
641 | } | |
642 | } | |
643 | buffer_append(&buffer, "\0", 1); | |
644 | cp = xstrdup(buffer_ptr(&buffer)); | |
645 | buffer_free(&buffer); | |
646 | return cp; | |
647 | } | |
648 | ||
649 | void | |
650 | channel_send_open(int id) | |
651 | { | |
652 | Channel *c = channel_lookup(id); | |
e1feb9bf | 653 | |
8e7895b8 | 654 | if (c == NULL) { |
bbe88b6d | 655 | logit("channel_send_open: %d: bad id", id); |
8e7895b8 | 656 | return; |
657 | } | |
6226a8f8 | 658 | debug2("channel %d: send open", id); |
8e7895b8 | 659 | packet_start(SSH2_MSG_CHANNEL_OPEN); |
660 | packet_put_cstring(c->ctype); | |
661 | packet_put_int(c->self); | |
662 | packet_put_int(c->local_window); | |
663 | packet_put_int(c->local_maxpacket); | |
664 | packet_send(); | |
665 | } | |
666 | ||
667 | void | |
6226a8f8 | 668 | channel_request_start(int id, char *service, int wantconfirm) |
8e7895b8 | 669 | { |
6226a8f8 | 670 | Channel *c = channel_lookup(id); |
e1feb9bf | 671 | |
8e7895b8 | 672 | if (c == NULL) { |
bbe88b6d | 673 | logit("channel_request_start: %d: unknown channel id", id); |
8e7895b8 | 674 | return; |
675 | } | |
5e96b616 | 676 | debug2("channel %d: request %s confirm %d", id, service, wantconfirm); |
8e7895b8 | 677 | packet_start(SSH2_MSG_CHANNEL_REQUEST); |
678 | packet_put_int(c->remote_id); | |
679 | packet_put_cstring(service); | |
680 | packet_put_char(wantconfirm); | |
681 | } | |
a7137f6b | 682 | |
8e7895b8 | 683 | void |
3593bdc0 | 684 | channel_register_status_confirm(int id, channel_confirm_cb *cb, |
685 | channel_confirm_abandon_cb *abandon_cb, void *ctx) | |
686 | { | |
687 | struct channel_confirm *cc; | |
688 | Channel *c; | |
689 | ||
690 | if ((c = channel_lookup(id)) == NULL) | |
691 | fatal("channel_register_expect: %d: bad id", id); | |
692 | ||
693 | cc = xmalloc(sizeof(*cc)); | |
694 | cc->cb = cb; | |
695 | cc->abandon_cb = abandon_cb; | |
696 | cc->ctx = ctx; | |
697 | TAILQ_INSERT_TAIL(&c->status_confirms, cc, entry); | |
698 | } | |
699 | ||
700 | void | |
701 | channel_register_open_confirm(int id, channel_callback_fn *fn, void *ctx) | |
8e7895b8 | 702 | { |
703 | Channel *c = channel_lookup(id); | |
e1feb9bf | 704 | |
8e7895b8 | 705 | if (c == NULL) { |
2ea438c2 | 706 | logit("channel_register_open_confirm: %d: bad id", id); |
8e7895b8 | 707 | return; |
708 | } | |
3593bdc0 | 709 | c->open_confirm = fn; |
710 | c->open_confirm_ctx = ctx; | |
8e7895b8 | 711 | } |
a7137f6b | 712 | |
8e7895b8 | 713 | void |
8cd0437d | 714 | channel_register_cleanup(int id, channel_callback_fn *fn, int do_close) |
8e7895b8 | 715 | { |
b872f7f0 | 716 | Channel *c = channel_by_id(id); |
e1feb9bf | 717 | |
8e7895b8 | 718 | if (c == NULL) { |
bbe88b6d | 719 | logit("channel_register_cleanup: %d: bad id", id); |
8e7895b8 | 720 | return; |
721 | } | |
3cf2be58 | 722 | c->detach_user = fn; |
8cd0437d | 723 | c->detach_close = do_close; |
8e7895b8 | 724 | } |
a7137f6b | 725 | |
8e7895b8 | 726 | void |
727 | channel_cancel_cleanup(int id) | |
728 | { | |
b872f7f0 | 729 | Channel *c = channel_by_id(id); |
e1feb9bf | 730 | |
8e7895b8 | 731 | if (c == NULL) { |
bbe88b6d | 732 | logit("channel_cancel_cleanup: %d: bad id", id); |
8e7895b8 | 733 | return; |
734 | } | |
3cf2be58 | 735 | c->detach_user = NULL; |
8cd0437d | 736 | c->detach_close = 0; |
8e7895b8 | 737 | } |
a7137f6b | 738 | |
8e7895b8 | 739 | void |
c1c6a032 | 740 | channel_register_filter(int id, channel_infilter_fn *ifn, |
e74caf1e | 741 | channel_outfilter_fn *ofn, channel_filter_cleanup_fn *cfn, void *ctx) |
8e7895b8 | 742 | { |
743 | Channel *c = channel_lookup(id); | |
e1feb9bf | 744 | |
8e7895b8 | 745 | if (c == NULL) { |
bbe88b6d | 746 | logit("channel_register_filter: %d: bad id", id); |
8e7895b8 | 747 | return; |
748 | } | |
c1c6a032 | 749 | c->input_filter = ifn; |
750 | c->output_filter = ofn; | |
f17f705b | 751 | c->filter_ctx = ctx; |
e74caf1e | 752 | c->filter_cleanup = cfn; |
8e7895b8 | 753 | } |
754 | ||
6ae2364d | 755 | void |
8e7895b8 | 756 | channel_set_fds(int id, int rfd, int wfd, int efd, |
b3784859 | 757 | int extusage, int nonblock, int is_tty, u_int window_max) |
8efc0c15 | 758 | { |
8e7895b8 | 759 | Channel *c = channel_lookup(id); |
e1feb9bf | 760 | |
8e7895b8 | 761 | if (c == NULL || c->type != SSH_CHANNEL_LARVAL) |
762 | fatal("channel_activate for non-larval channel %d.", id); | |
b3784859 | 763 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock, is_tty); |
8e7895b8 | 764 | c->type = SSH_CHANNEL_OPEN; |
399d1ea6 | 765 | c->local_window = c->local_window_max = window_max; |
8e7895b8 | 766 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
767 | packet_put_int(c->remote_id); | |
768 | packet_put_int(c->local_window); | |
769 | packet_send(); | |
8efc0c15 | 770 | } |
771 | ||
aa3378df | 772 | /* |
7368a6c8 | 773 | * 'channel_pre*' are called just before select() to add any bits relevant to |
774 | * channels in the select bitmasks. | |
aa3378df | 775 | */ |
7368a6c8 | 776 | /* |
777 | * 'channel_post*': perform any appropriate operations for channels which | |
778 | * have events pending. | |
779 | */ | |
c8e9c167 | 780 | typedef void chan_fn(Channel *c, fd_set *readset, fd_set *writeset); |
7368a6c8 | 781 | chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE]; |
782 | chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE]; | |
8efc0c15 | 783 | |
ebb90778 | 784 | /* ARGSUSED */ |
396c147e | 785 | static void |
c8e9c167 | 786 | channel_pre_listener(Channel *c, fd_set *readset, fd_set *writeset) |
8efc0c15 | 787 | { |
7368a6c8 | 788 | FD_SET(c->sock, readset); |
789 | } | |
5260325f | 790 | |
ebb90778 | 791 | /* ARGSUSED */ |
396c147e | 792 | static void |
c8e9c167 | 793 | channel_pre_connecting(Channel *c, fd_set *readset, fd_set *writeset) |
97fb6912 | 794 | { |
795 | debug3("channel %d: waiting for connection", c->self); | |
796 | FD_SET(c->sock, writeset); | |
797 | } | |
798 | ||
396c147e | 799 | static void |
c8e9c167 | 800 | channel_pre_open_13(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 801 | { |
802 | if (buffer_len(&c->input) < packet_get_maxsize()) | |
803 | FD_SET(c->sock, readset); | |
804 | if (buffer_len(&c->output) > 0) | |
805 | FD_SET(c->sock, writeset); | |
806 | } | |
5260325f | 807 | |
396c147e | 808 | static void |
c8e9c167 | 809 | channel_pre_open(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 810 | { |
0c0738d5 | 811 | u_int limit = compat20 ? c->remote_window : packet_get_maxsize(); |
5260325f | 812 | |
7e7327a1 | 813 | if (c->istate == CHAN_INPUT_OPEN && |
0c0738d5 | 814 | limit > 0 && |
69d9d413 | 815 | buffer_len(&c->input) < limit && |
816 | buffer_check_alloc(&c->input, CHAN_RBUF)) | |
7e7327a1 | 817 | FD_SET(c->rfd, readset); |
818 | if (c->ostate == CHAN_OUTPUT_OPEN || | |
819 | c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { | |
820 | if (buffer_len(&c->output) > 0) { | |
821 | FD_SET(c->wfd, writeset); | |
822 | } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { | |
d2296ed7 | 823 | if (CHANNEL_EFD_OUTPUT_ACTIVE(c)) |
4e2e5cfd | 824 | debug2("channel %d: obuf_empty delayed efd %d/(%d)", |
825 | c->self, c->efd, buffer_len(&c->extended)); | |
d2296ed7 | 826 | else |
827 | chan_obuf_empty(c); | |
7e7327a1 | 828 | } |
829 | } | |
830 | /** XXX check close conditions, too */ | |
271f4a13 | 831 | if (compat20 && c->efd != -1 && |
832 | !(c->istate == CHAN_INPUT_CLOSED && c->ostate == CHAN_OUTPUT_CLOSED)) { | |
7e7327a1 | 833 | if (c->extended_usage == CHAN_EXTENDED_WRITE && |
834 | buffer_len(&c->extended) > 0) | |
835 | FD_SET(c->efd, writeset); | |
d2296ed7 | 836 | else if (!(c->flags & CHAN_EOF_SENT) && |
837 | c->extended_usage == CHAN_EXTENDED_READ && | |
7e7327a1 | 838 | buffer_len(&c->extended) < c->remote_window) |
839 | FD_SET(c->efd, readset); | |
840 | } | |
5e96b616 | 841 | /* XXX: What about efd? races? */ |
f2107e97 | 842 | if (compat20 && c->ctl_fd != -1 && |
5e96b616 | 843 | c->istate == CHAN_INPUT_OPEN && c->ostate == CHAN_OUTPUT_OPEN) |
844 | FD_SET(c->ctl_fd, readset); | |
7e7327a1 | 845 | } |
846 | ||
ebb90778 | 847 | /* ARGSUSED */ |
396c147e | 848 | static void |
c8e9c167 | 849 | channel_pre_input_draining(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 850 | { |
851 | if (buffer_len(&c->input) == 0) { | |
852 | packet_start(SSH_MSG_CHANNEL_CLOSE); | |
853 | packet_put_int(c->remote_id); | |
854 | packet_send(); | |
855 | c->type = SSH_CHANNEL_CLOSED; | |
d7ac5f18 | 856 | debug2("channel %d: closing after input drain.", c->self); |
7368a6c8 | 857 | } |
858 | } | |
5260325f | 859 | |
ebb90778 | 860 | /* ARGSUSED */ |
396c147e | 861 | static void |
c8e9c167 | 862 | channel_pre_output_draining(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 863 | { |
864 | if (buffer_len(&c->output) == 0) | |
719fc62f | 865 | chan_mark_dead(c); |
6ae2364d | 866 | else |
7368a6c8 | 867 | FD_SET(c->sock, writeset); |
868 | } | |
5260325f | 869 | |
7368a6c8 | 870 | /* |
871 | * This is a special state for X11 authentication spoofing. An opened X11 | |
872 | * connection (when authentication spoofing is being done) remains in this | |
873 | * state until the first packet has been completely read. The authentication | |
874 | * data in that packet is then substituted by the real data if it matches the | |
875 | * fake data, and the channel is put into normal mode. | |
0b242b12 | 876 | * XXX All this happens at the client side. |
8e7895b8 | 877 | * Returns: 0 = need more data, -1 = wrong cookie, 1 = ok |
7368a6c8 | 878 | */ |
396c147e | 879 | static int |
8e7895b8 | 880 | x11_open_helper(Buffer *b) |
7368a6c8 | 881 | { |
1e3b8b07 | 882 | u_char *ucp; |
883 | u_int proto_len, data_len; | |
5260325f | 884 | |
7368a6c8 | 885 | /* Check if the fixed size part of the packet is in buffer. */ |
8e7895b8 | 886 | if (buffer_len(b) < 12) |
7368a6c8 | 887 | return 0; |
888 | ||
889 | /* Parse the lengths of variable-length fields. */ | |
20905a8e | 890 | ucp = buffer_ptr(b); |
7368a6c8 | 891 | if (ucp[0] == 0x42) { /* Byte order MSB first. */ |
892 | proto_len = 256 * ucp[6] + ucp[7]; | |
893 | data_len = 256 * ucp[8] + ucp[9]; | |
894 | } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */ | |
895 | proto_len = ucp[6] + 256 * ucp[7]; | |
896 | data_len = ucp[8] + 256 * ucp[9]; | |
897 | } else { | |
d7ac5f18 | 898 | debug2("Initial X11 packet contains bad byte order byte: 0x%x", |
184eed6a | 899 | ucp[0]); |
7368a6c8 | 900 | return -1; |
901 | } | |
5260325f | 902 | |
7368a6c8 | 903 | /* Check if the whole packet is in buffer. */ |
8e7895b8 | 904 | if (buffer_len(b) < |
7368a6c8 | 905 | 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3)) |
906 | return 0; | |
5260325f | 907 | |
7368a6c8 | 908 | /* Check if authentication protocol matches. */ |
909 | if (proto_len != strlen(x11_saved_proto) || | |
910 | memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) { | |
d7ac5f18 | 911 | debug2("X11 connection uses different authentication protocol."); |
7368a6c8 | 912 | return -1; |
913 | } | |
914 | /* Check if authentication data matches our fake data. */ | |
915 | if (data_len != x11_fake_data_len || | |
916 | memcmp(ucp + 12 + ((proto_len + 3) & ~3), | |
917 | x11_fake_data, x11_fake_data_len) != 0) { | |
d7ac5f18 | 918 | debug2("X11 auth data does not match fake data."); |
7368a6c8 | 919 | return -1; |
920 | } | |
921 | /* Check fake data length */ | |
922 | if (x11_fake_data_len != x11_saved_data_len) { | |
923 | error("X11 fake_data_len %d != saved_data_len %d", | |
924 | x11_fake_data_len, x11_saved_data_len); | |
925 | return -1; | |
926 | } | |
927 | /* | |
928 | * Received authentication protocol and data match | |
929 | * our fake data. Substitute the fake data with real | |
930 | * data. | |
931 | */ | |
932 | memcpy(ucp + 12 + ((proto_len + 3) & ~3), | |
933 | x11_saved_data, x11_saved_data_len); | |
934 | return 1; | |
935 | } | |
5260325f | 936 | |
396c147e | 937 | static void |
c8e9c167 | 938 | channel_pre_x11_open_13(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 939 | { |
8e7895b8 | 940 | int ret = x11_open_helper(&c->output); |
e1feb9bf | 941 | |
7368a6c8 | 942 | if (ret == 1) { |
943 | /* Start normal processing for the channel. */ | |
944 | c->type = SSH_CHANNEL_OPEN; | |
a8be9f80 | 945 | channel_pre_open_13(c, readset, writeset); |
7368a6c8 | 946 | } else if (ret == -1) { |
947 | /* | |
948 | * We have received an X11 connection that has bad | |
949 | * authentication information. | |
950 | */ | |
bbe88b6d | 951 | logit("X11 connection rejected because of wrong authentication."); |
7368a6c8 | 952 | buffer_clear(&c->input); |
953 | buffer_clear(&c->output); | |
489aa2e9 | 954 | channel_close_fd(&c->sock); |
7368a6c8 | 955 | c->sock = -1; |
956 | c->type = SSH_CHANNEL_CLOSED; | |
957 | packet_start(SSH_MSG_CHANNEL_CLOSE); | |
958 | packet_put_int(c->remote_id); | |
959 | packet_send(); | |
960 | } | |
961 | } | |
5260325f | 962 | |
396c147e | 963 | static void |
c8e9c167 | 964 | channel_pre_x11_open(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 965 | { |
8e7895b8 | 966 | int ret = x11_open_helper(&c->output); |
a5f82435 | 967 | |
968 | /* c->force_drain = 1; */ | |
969 | ||
7368a6c8 | 970 | if (ret == 1) { |
971 | c->type = SSH_CHANNEL_OPEN; | |
0c0738d5 | 972 | channel_pre_open(c, readset, writeset); |
7368a6c8 | 973 | } else if (ret == -1) { |
bbe88b6d | 974 | logit("X11 connection rejected because of wrong authentication."); |
d7ac5f18 | 975 | debug2("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate); |
8341f420 | 976 | chan_read_failed(c); |
977 | buffer_clear(&c->input); | |
978 | chan_ibuf_empty(c); | |
979 | buffer_clear(&c->output); | |
980 | /* for proto v1, the peer will send an IEOF */ | |
981 | if (compat20) | |
982 | chan_write_failed(c); | |
983 | else | |
984 | c->type = SSH_CHANNEL_OPEN; | |
d7ac5f18 | 985 | debug2("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate); |
7368a6c8 | 986 | } |
987 | } | |
5260325f | 988 | |
28b9cb4d | 989 | /* try to decode a socks4 header */ |
ebb90778 | 990 | /* ARGSUSED */ |
396c147e | 991 | static int |
c8e9c167 | 992 | channel_decode_socks4(Channel *c, fd_set *readset, fd_set *writeset) |
0490e609 | 993 | { |
661e45a0 | 994 | char *p, *host; |
4866a6d6 | 995 | u_int len, have, i, found, need; |
184eed6a | 996 | char username[256]; |
0490e609 | 997 | struct { |
998 | u_int8_t version; | |
999 | u_int8_t command; | |
1000 | u_int16_t dest_port; | |
28b9cb4d | 1001 | struct in_addr dest_addr; |
0490e609 | 1002 | } s4_req, s4_rsp; |
1003 | ||
28b9cb4d | 1004 | debug2("channel %d: decode socks4", c->self); |
53b8fe68 | 1005 | |
1006 | have = buffer_len(&c->input); | |
1007 | len = sizeof(s4_req); | |
1008 | if (have < len) | |
1009 | return 0; | |
1010 | p = buffer_ptr(&c->input); | |
4866a6d6 | 1011 | |
1012 | need = 1; | |
1013 | /* SOCKS4A uses an invalid IP address 0.0.0.x */ | |
1014 | if (p[4] == 0 && p[5] == 0 && p[6] == 0 && p[7] != 0) { | |
1015 | debug2("channel %d: socks4a request", c->self); | |
1016 | /* ... and needs an extra string (the hostname) */ | |
1017 | need = 2; | |
1018 | } | |
1019 | /* Check for terminating NUL on the string(s) */ | |
53b8fe68 | 1020 | for (found = 0, i = len; i < have; i++) { |
1021 | if (p[i] == '\0') { | |
4866a6d6 | 1022 | found++; |
1023 | if (found == need) | |
1024 | break; | |
53b8fe68 | 1025 | } |
1026 | if (i > 1024) { | |
1027 | /* the peer is probably sending garbage */ | |
1028 | debug("channel %d: decode socks4: too long", | |
1029 | c->self); | |
1030 | return -1; | |
1031 | } | |
1032 | } | |
4866a6d6 | 1033 | if (found < need) |
53b8fe68 | 1034 | return 0; |
0490e609 | 1035 | buffer_get(&c->input, (char *)&s4_req.version, 1); |
1036 | buffer_get(&c->input, (char *)&s4_req.command, 1); | |
1037 | buffer_get(&c->input, (char *)&s4_req.dest_port, 2); | |
28b9cb4d | 1038 | buffer_get(&c->input, (char *)&s4_req.dest_addr, 4); |
53b8fe68 | 1039 | have = buffer_len(&c->input); |
0490e609 | 1040 | p = buffer_ptr(&c->input); |
1041 | len = strlen(p); | |
6683b40f | 1042 | debug2("channel %d: decode socks4: user %s/%d", c->self, p, len); |
4866a6d6 | 1043 | len++; /* trailing '\0' */ |
0490e609 | 1044 | if (len > have) |
28b9cb4d | 1045 | fatal("channel %d: decode socks4: len %d > have %d", |
0490e609 | 1046 | c->self, len, have); |
1047 | strlcpy(username, p, sizeof(username)); | |
1048 | buffer_consume(&c->input, len); | |
0490e609 | 1049 | |
1338ba77 | 1050 | if (c->path != NULL) { |
1051 | xfree(c->path); | |
1052 | c->path = NULL; | |
1053 | } | |
4866a6d6 | 1054 | if (need == 1) { /* SOCKS4: one string */ |
1055 | host = inet_ntoa(s4_req.dest_addr); | |
1338ba77 | 1056 | c->path = xstrdup(host); |
4866a6d6 | 1057 | } else { /* SOCKS4A: two strings */ |
1058 | have = buffer_len(&c->input); | |
1059 | p = buffer_ptr(&c->input); | |
1060 | len = strlen(p); | |
1061 | debug2("channel %d: decode socks4a: host %s/%d", | |
1062 | c->self, p, len); | |
1063 | len++; /* trailing '\0' */ | |
1064 | if (len > have) | |
1065 | fatal("channel %d: decode socks4a: len %d > have %d", | |
1066 | c->self, len, have); | |
1338ba77 | 1067 | if (len > NI_MAXHOST) { |
4866a6d6 | 1068 | error("channel %d: hostname \"%.100s\" too long", |
1069 | c->self, p); | |
1070 | return -1; | |
1071 | } | |
1338ba77 | 1072 | c->path = xstrdup(p); |
4866a6d6 | 1073 | buffer_consume(&c->input, len); |
1074 | } | |
0490e609 | 1075 | c->host_port = ntohs(s4_req.dest_port); |
184eed6a | 1076 | |
d7ac5f18 | 1077 | debug2("channel %d: dynamic request: socks4 host %s port %u command %u", |
4866a6d6 | 1078 | c->self, c->path, c->host_port, s4_req.command); |
0490e609 | 1079 | |
28b9cb4d | 1080 | if (s4_req.command != 1) { |
4866a6d6 | 1081 | debug("channel %d: cannot handle: %s cn %d", |
1082 | c->self, need == 1 ? "SOCKS4" : "SOCKS4A", s4_req.command); | |
28b9cb4d | 1083 | return -1; |
0490e609 | 1084 | } |
28b9cb4d | 1085 | s4_rsp.version = 0; /* vn: 0 for reply */ |
1086 | s4_rsp.command = 90; /* cd: req granted */ | |
0490e609 | 1087 | s4_rsp.dest_port = 0; /* ignored */ |
28b9cb4d | 1088 | s4_rsp.dest_addr.s_addr = INADDR_ANY; /* ignored */ |
15dd2c4f | 1089 | buffer_append(&c->output, &s4_rsp, sizeof(s4_rsp)); |
28b9cb4d | 1090 | return 1; |
0490e609 | 1091 | } |
1092 | ||
f49658f5 | 1093 | /* try to decode a socks5 header */ |
1094 | #define SSH_SOCKS5_AUTHDONE 0x1000 | |
1095 | #define SSH_SOCKS5_NOAUTH 0x00 | |
1096 | #define SSH_SOCKS5_IPV4 0x01 | |
1097 | #define SSH_SOCKS5_DOMAIN 0x03 | |
1098 | #define SSH_SOCKS5_IPV6 0x04 | |
1099 | #define SSH_SOCKS5_CONNECT 0x01 | |
1100 | #define SSH_SOCKS5_SUCCESS 0x00 | |
1101 | ||
ebb90778 | 1102 | /* ARGSUSED */ |
f49658f5 | 1103 | static int |
c8e9c167 | 1104 | channel_decode_socks5(Channel *c, fd_set *readset, fd_set *writeset) |
f49658f5 | 1105 | { |
1106 | struct { | |
1107 | u_int8_t version; | |
1108 | u_int8_t command; | |
1109 | u_int8_t reserved; | |
1110 | u_int8_t atyp; | |
1111 | } s5_req, s5_rsp; | |
1112 | u_int16_t dest_port; | |
1338ba77 | 1113 | u_char *p, dest_addr[255+1], ntop[INET6_ADDRSTRLEN]; |
a217e418 | 1114 | u_int have, need, i, found, nmethods, addrlen, af; |
f49658f5 | 1115 | |
1116 | debug2("channel %d: decode socks5", c->self); | |
1117 | p = buffer_ptr(&c->input); | |
1118 | if (p[0] != 0x05) | |
1119 | return -1; | |
1120 | have = buffer_len(&c->input); | |
1121 | if (!(c->flags & SSH_SOCKS5_AUTHDONE)) { | |
1122 | /* format: ver | nmethods | methods */ | |
aff51935 | 1123 | if (have < 2) |
f49658f5 | 1124 | return 0; |
1125 | nmethods = p[1]; | |
1126 | if (have < nmethods + 2) | |
1127 | return 0; | |
1128 | /* look for method: "NO AUTHENTICATION REQUIRED" */ | |
4f6e2ba9 | 1129 | for (found = 0, i = 2; i < nmethods + 2; i++) { |
d4f40d92 | 1130 | if (p[i] == SSH_SOCKS5_NOAUTH) { |
f49658f5 | 1131 | found = 1; |
1132 | break; | |
1133 | } | |
1134 | } | |
1135 | if (!found) { | |
1136 | debug("channel %d: method SSH_SOCKS5_NOAUTH not found", | |
1137 | c->self); | |
1138 | return -1; | |
1139 | } | |
1140 | buffer_consume(&c->input, nmethods + 2); | |
1141 | buffer_put_char(&c->output, 0x05); /* version */ | |
1142 | buffer_put_char(&c->output, SSH_SOCKS5_NOAUTH); /* method */ | |
1143 | FD_SET(c->sock, writeset); | |
1144 | c->flags |= SSH_SOCKS5_AUTHDONE; | |
1145 | debug2("channel %d: socks5 auth done", c->self); | |
1146 | return 0; /* need more */ | |
1147 | } | |
1148 | debug2("channel %d: socks5 post auth", c->self); | |
1149 | if (have < sizeof(s5_req)+1) | |
1150 | return 0; /* need more */ | |
5b5f6af7 | 1151 | memcpy(&s5_req, p, sizeof(s5_req)); |
f49658f5 | 1152 | if (s5_req.version != 0x05 || |
1153 | s5_req.command != SSH_SOCKS5_CONNECT || | |
1154 | s5_req.reserved != 0x00) { | |
d7ac5f18 | 1155 | debug2("channel %d: only socks5 connect supported", c->self); |
f49658f5 | 1156 | return -1; |
1157 | } | |
f8cc7664 | 1158 | switch (s5_req.atyp){ |
f49658f5 | 1159 | case SSH_SOCKS5_IPV4: |
1160 | addrlen = 4; | |
1161 | af = AF_INET; | |
1162 | break; | |
1163 | case SSH_SOCKS5_DOMAIN: | |
1164 | addrlen = p[sizeof(s5_req)]; | |
1165 | af = -1; | |
1166 | break; | |
1167 | case SSH_SOCKS5_IPV6: | |
1168 | addrlen = 16; | |
1169 | af = AF_INET6; | |
1170 | break; | |
1171 | default: | |
d7ac5f18 | 1172 | debug2("channel %d: bad socks5 atyp %d", c->self, s5_req.atyp); |
f49658f5 | 1173 | return -1; |
1174 | } | |
a217e418 | 1175 | need = sizeof(s5_req) + addrlen + 2; |
1176 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) | |
1177 | need++; | |
1178 | if (have < need) | |
f49658f5 | 1179 | return 0; |
1180 | buffer_consume(&c->input, sizeof(s5_req)); | |
1181 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) | |
1182 | buffer_consume(&c->input, 1); /* host string length */ | |
1183 | buffer_get(&c->input, (char *)&dest_addr, addrlen); | |
1184 | buffer_get(&c->input, (char *)&dest_port, 2); | |
1185 | dest_addr[addrlen] = '\0'; | |
1338ba77 | 1186 | if (c->path != NULL) { |
1187 | xfree(c->path); | |
1188 | c->path = NULL; | |
1189 | } | |
1190 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) { | |
920706fd | 1191 | if (addrlen >= NI_MAXHOST) { |
1338ba77 | 1192 | error("channel %d: dynamic request: socks5 hostname " |
1193 | "\"%.100s\" too long", c->self, dest_addr); | |
1194 | return -1; | |
1195 | } | |
1196 | c->path = xstrdup(dest_addr); | |
1197 | } else { | |
1198 | if (inet_ntop(af, dest_addr, ntop, sizeof(ntop)) == NULL) | |
1199 | return -1; | |
1200 | c->path = xstrdup(ntop); | |
1201 | } | |
f49658f5 | 1202 | c->host_port = ntohs(dest_port); |
b6453d99 | 1203 | |
d7ac5f18 | 1204 | debug2("channel %d: dynamic request: socks5 host %s port %u command %u", |
f49658f5 | 1205 | c->self, c->path, c->host_port, s5_req.command); |
1206 | ||
1207 | s5_rsp.version = 0x05; | |
1208 | s5_rsp.command = SSH_SOCKS5_SUCCESS; | |
1209 | s5_rsp.reserved = 0; /* ignored */ | |
1210 | s5_rsp.atyp = SSH_SOCKS5_IPV4; | |
1211 | ((struct in_addr *)&dest_addr)->s_addr = INADDR_ANY; | |
1212 | dest_port = 0; /* ignored */ | |
1213 | ||
15dd2c4f | 1214 | buffer_append(&c->output, &s5_rsp, sizeof(s5_rsp)); |
1215 | buffer_append(&c->output, &dest_addr, sizeof(struct in_addr)); | |
1216 | buffer_append(&c->output, &dest_port, sizeof(dest_port)); | |
f49658f5 | 1217 | return 1; |
1218 | } | |
1219 | ||
28b9cb4d | 1220 | /* dynamic port forwarding */ |
396c147e | 1221 | static void |
c8e9c167 | 1222 | channel_pre_dynamic(Channel *c, fd_set *readset, fd_set *writeset) |
28b9cb4d | 1223 | { |
1224 | u_char *p; | |
2ceb8101 | 1225 | u_int have; |
1226 | int ret; | |
28b9cb4d | 1227 | |
1228 | have = buffer_len(&c->input); | |
28b9cb4d | 1229 | debug2("channel %d: pre_dynamic: have %d", c->self, have); |
070adba2 | 1230 | /* buffer_dump(&c->input); */ |
28b9cb4d | 1231 | /* check if the fixed size part of the packet is in buffer. */ |
f49658f5 | 1232 | if (have < 3) { |
28b9cb4d | 1233 | /* need more */ |
1234 | FD_SET(c->sock, readset); | |
1235 | return; | |
1236 | } | |
1237 | /* try to guess the protocol */ | |
1238 | p = buffer_ptr(&c->input); | |
1239 | switch (p[0]) { | |
6683b40f | 1240 | case 0x04: |
1241 | ret = channel_decode_socks4(c, readset, writeset); | |
1242 | break; | |
f49658f5 | 1243 | case 0x05: |
1244 | ret = channel_decode_socks5(c, readset, writeset); | |
1245 | break; | |
28b9cb4d | 1246 | default: |
1247 | ret = -1; | |
1248 | break; | |
1249 | } | |
1250 | if (ret < 0) { | |
719fc62f | 1251 | chan_mark_dead(c); |
28b9cb4d | 1252 | } else if (ret == 0) { |
1253 | debug2("channel %d: pre_dynamic: need more", c->self); | |
1254 | /* need more */ | |
1255 | FD_SET(c->sock, readset); | |
1256 | } else { | |
1257 | /* switch to the next state */ | |
1258 | c->type = SSH_CHANNEL_OPENING; | |
1259 | port_open_helper(c, "direct-tcpip"); | |
1260 | } | |
1261 | } | |
0490e609 | 1262 | |
7368a6c8 | 1263 | /* This is our fake X11 server socket. */ |
ebb90778 | 1264 | /* ARGSUSED */ |
396c147e | 1265 | static void |
c8e9c167 | 1266 | channel_post_x11_listener(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1267 | { |
719fc62f | 1268 | Channel *nc; |
9fb764ab | 1269 | struct sockaddr_storage addr; |
bcc0381e | 1270 | int newsock; |
7368a6c8 | 1271 | socklen_t addrlen; |
865ac82e | 1272 | char buf[16384], *remote_ipaddr; |
0b242b12 | 1273 | int remote_port; |
7368a6c8 | 1274 | |
1275 | if (FD_ISSET(c->sock, readset)) { | |
1276 | debug("X11 connection requested."); | |
1277 | addrlen = sizeof(addr); | |
9fb764ab | 1278 | newsock = accept(c->sock, (struct sockaddr *)&addr, &addrlen); |
ac151b18 | 1279 | if (c->single_connection) { |
d7ac5f18 | 1280 | debug2("single_connection: closing X11 listener."); |
ac151b18 | 1281 | channel_close_fd(&c->sock); |
1282 | chan_mark_dead(c); | |
1283 | } | |
7368a6c8 | 1284 | if (newsock < 0) { |
1285 | error("accept: %.100s", strerror(errno)); | |
1286 | return; | |
5260325f | 1287 | } |
bcc0381e | 1288 | set_nodelay(newsock); |
865ac82e | 1289 | remote_ipaddr = get_peer_ipaddr(newsock); |
0b242b12 | 1290 | remote_port = get_peer_port(newsock); |
7368a6c8 | 1291 | snprintf(buf, sizeof buf, "X11 connection from %.200s port %d", |
865ac82e | 1292 | remote_ipaddr, remote_port); |
0b242b12 | 1293 | |
719fc62f | 1294 | nc = channel_new("accepted x11 socket", |
0b242b12 | 1295 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
0d942eff | 1296 | c->local_window_max, c->local_maxpacket, 0, buf, 1); |
0b242b12 | 1297 | if (compat20) { |
1298 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1299 | packet_put_cstring("x11"); | |
719fc62f | 1300 | packet_put_int(nc->self); |
ac151b18 | 1301 | packet_put_int(nc->local_window_max); |
1302 | packet_put_int(nc->local_maxpacket); | |
865ac82e | 1303 | /* originator ipaddr and port */ |
1304 | packet_put_cstring(remote_ipaddr); | |
d0c832f3 | 1305 | if (datafellows & SSH_BUG_X11FWD) { |
d7ac5f18 | 1306 | debug2("ssh2 x11 bug compat mode"); |
d0c832f3 | 1307 | } else { |
1308 | packet_put_int(remote_port); | |
1309 | } | |
0b242b12 | 1310 | packet_send(); |
1311 | } else { | |
1312 | packet_start(SSH_SMSG_X11_OPEN); | |
719fc62f | 1313 | packet_put_int(nc->self); |
8e7895b8 | 1314 | if (packet_get_protocol_flags() & |
1315 | SSH_PROTOFLAG_HOST_IN_FWD_OPEN) | |
449c5ba5 | 1316 | packet_put_cstring(buf); |
0b242b12 | 1317 | packet_send(); |
1318 | } | |
865ac82e | 1319 | xfree(remote_ipaddr); |
8efc0c15 | 1320 | } |
8efc0c15 | 1321 | } |
1322 | ||
396c147e | 1323 | static void |
0490e609 | 1324 | port_open_helper(Channel *c, char *rtype) |
1325 | { | |
1326 | int direct; | |
1327 | char buf[1024]; | |
1328 | char *remote_ipaddr = get_peer_ipaddr(c->sock); | |
29798ed0 | 1329 | int remote_port = get_peer_port(c->sock); |
0490e609 | 1330 | |
1331 | direct = (strcmp(rtype, "direct-tcpip") == 0); | |
1332 | ||
1333 | snprintf(buf, sizeof buf, | |
1334 | "%s: listening port %d for %.100s port %d, " | |
1335 | "connect from %.200s port %d", | |
1336 | rtype, c->listening_port, c->path, c->host_port, | |
1337 | remote_ipaddr, remote_port); | |
1338 | ||
1339 | xfree(c->remote_name); | |
1340 | c->remote_name = xstrdup(buf); | |
1341 | ||
1342 | if (compat20) { | |
1343 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1344 | packet_put_cstring(rtype); | |
1345 | packet_put_int(c->self); | |
1346 | packet_put_int(c->local_window_max); | |
1347 | packet_put_int(c->local_maxpacket); | |
1348 | if (direct) { | |
1349 | /* target host, port */ | |
1350 | packet_put_cstring(c->path); | |
1351 | packet_put_int(c->host_port); | |
1352 | } else { | |
1353 | /* listen address, port */ | |
1354 | packet_put_cstring(c->path); | |
1355 | packet_put_int(c->listening_port); | |
1356 | } | |
1357 | /* originator host and port */ | |
1358 | packet_put_cstring(remote_ipaddr); | |
29798ed0 | 1359 | packet_put_int((u_int)remote_port); |
0490e609 | 1360 | packet_send(); |
1361 | } else { | |
1362 | packet_start(SSH_MSG_PORT_OPEN); | |
1363 | packet_put_int(c->self); | |
1364 | packet_put_cstring(c->path); | |
1365 | packet_put_int(c->host_port); | |
8e7895b8 | 1366 | if (packet_get_protocol_flags() & |
1367 | SSH_PROTOFLAG_HOST_IN_FWD_OPEN) | |
0490e609 | 1368 | packet_put_cstring(c->remote_name); |
1369 | packet_send(); | |
1370 | } | |
1371 | xfree(remote_ipaddr); | |
1372 | } | |
1373 | ||
442aee3a | 1374 | static void |
1375 | channel_set_reuseaddr(int fd) | |
1376 | { | |
1377 | int on = 1; | |
1378 | ||
1379 | /* | |
1380 | * Set socket options. | |
1381 | * Allow local port reuse in TIME_WAIT. | |
1382 | */ | |
1383 | if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1) | |
1384 | error("setsockopt SO_REUSEADDR fd %d: %s", fd, strerror(errno)); | |
1385 | } | |
1386 | ||
aa3378df | 1387 | /* |
7368a6c8 | 1388 | * This socket is listening for connections to a forwarded TCP/IP port. |
aa3378df | 1389 | */ |
ebb90778 | 1390 | /* ARGSUSED */ |
396c147e | 1391 | static void |
c8e9c167 | 1392 | channel_post_port_listener(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1393 | { |
0490e609 | 1394 | Channel *nc; |
9fb764ab | 1395 | struct sockaddr_storage addr; |
719fc62f | 1396 | int newsock, nextstate; |
7368a6c8 | 1397 | socklen_t addrlen; |
0490e609 | 1398 | char *rtype; |
fa08c86b | 1399 | |
7368a6c8 | 1400 | if (FD_ISSET(c->sock, readset)) { |
1401 | debug("Connection to port %d forwarding " | |
1402 | "to %.100s port %d requested.", | |
1403 | c->listening_port, c->path, c->host_port); | |
0490e609 | 1404 | |
639cb8ab | 1405 | if (c->type == SSH_CHANNEL_RPORT_LISTENER) { |
1406 | nextstate = SSH_CHANNEL_OPENING; | |
1407 | rtype = "forwarded-tcpip"; | |
1408 | } else { | |
1409 | if (c->host_port == 0) { | |
1410 | nextstate = SSH_CHANNEL_DYNAMIC; | |
f3964cb9 | 1411 | rtype = "dynamic-tcpip"; |
639cb8ab | 1412 | } else { |
1413 | nextstate = SSH_CHANNEL_OPENING; | |
1414 | rtype = "direct-tcpip"; | |
1415 | } | |
1416 | } | |
0490e609 | 1417 | |
7368a6c8 | 1418 | addrlen = sizeof(addr); |
9fb764ab | 1419 | newsock = accept(c->sock, (struct sockaddr *)&addr, &addrlen); |
7368a6c8 | 1420 | if (newsock < 0) { |
1421 | error("accept: %.100s", strerror(errno)); | |
1422 | return; | |
1423 | } | |
811a6342 | 1424 | set_nodelay(newsock); |
0d942eff | 1425 | nc = channel_new(rtype, nextstate, newsock, newsock, -1, |
1426 | c->local_window_max, c->local_maxpacket, 0, rtype, 1); | |
0490e609 | 1427 | nc->listening_port = c->listening_port; |
1428 | nc->host_port = c->host_port; | |
1338ba77 | 1429 | if (c->path != NULL) |
1430 | nc->path = xstrdup(c->path); | |
0490e609 | 1431 | |
7501ed0d | 1432 | if (nextstate != SSH_CHANNEL_DYNAMIC) |
0490e609 | 1433 | port_open_helper(nc, rtype); |
7368a6c8 | 1434 | } |
1435 | } | |
8efc0c15 | 1436 | |
7368a6c8 | 1437 | /* |
1438 | * This is the authentication agent socket listening for connections from | |
1439 | * clients. | |
1440 | */ | |
ebb90778 | 1441 | /* ARGSUSED */ |
396c147e | 1442 | static void |
c8e9c167 | 1443 | channel_post_auth_listener(Channel *c, fd_set *readset, fd_set *writeset) |
8efc0c15 | 1444 | { |
719fc62f | 1445 | Channel *nc; |
1446 | int newsock; | |
9fb764ab | 1447 | struct sockaddr_storage addr; |
48e671d5 | 1448 | socklen_t addrlen; |
5260325f | 1449 | |
7368a6c8 | 1450 | if (FD_ISSET(c->sock, readset)) { |
1451 | addrlen = sizeof(addr); | |
9fb764ab | 1452 | newsock = accept(c->sock, (struct sockaddr *)&addr, &addrlen); |
7368a6c8 | 1453 | if (newsock < 0) { |
1454 | error("accept from auth socket: %.100s", strerror(errno)); | |
1455 | return; | |
1456 | } | |
719fc62f | 1457 | nc = channel_new("accepted auth socket", |
fa08c86b | 1458 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
1459 | c->local_window_max, c->local_maxpacket, | |
0d942eff | 1460 | 0, "accepted auth socket", 1); |
fa08c86b | 1461 | if (compat20) { |
1462 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1463 | packet_put_cstring("auth-agent@openssh.com"); | |
719fc62f | 1464 | packet_put_int(nc->self); |
fa08c86b | 1465 | packet_put_int(c->local_window_max); |
1466 | packet_put_int(c->local_maxpacket); | |
1467 | } else { | |
1468 | packet_start(SSH_SMSG_AGENT_OPEN); | |
719fc62f | 1469 | packet_put_int(nc->self); |
fa08c86b | 1470 | } |
7368a6c8 | 1471 | packet_send(); |
1472 | } | |
1473 | } | |
5260325f | 1474 | |
ebb90778 | 1475 | /* ARGSUSED */ |
396c147e | 1476 | static void |
c8e9c167 | 1477 | channel_post_connecting(Channel *c, fd_set *readset, fd_set *writeset) |
97fb6912 | 1478 | { |
e07e21ad | 1479 | int err = 0, sock; |
8ab2cb35 | 1480 | socklen_t sz = sizeof(err); |
d18e0850 | 1481 | |
97fb6912 | 1482 | if (FD_ISSET(c->sock, writeset)) { |
db518d9b | 1483 | if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, &err, &sz) < 0) { |
d18e0850 | 1484 | err = errno; |
1485 | error("getsockopt SO_ERROR failed"); | |
1486 | } | |
1487 | if (err == 0) { | |
e07e21ad | 1488 | debug("channel %d: connected to %s port %d", |
1489 | c->self, c->connect_ctx.host, c->connect_ctx.port); | |
1490 | channel_connect_ctx_free(&c->connect_ctx); | |
d18e0850 | 1491 | c->type = SSH_CHANNEL_OPEN; |
1492 | if (compat20) { | |
1493 | packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1494 | packet_put_int(c->remote_id); | |
1495 | packet_put_int(c->self); | |
1496 | packet_put_int(c->local_window); | |
1497 | packet_put_int(c->local_maxpacket); | |
1498 | } else { | |
1499 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1500 | packet_put_int(c->remote_id); | |
1501 | packet_put_int(c->self); | |
1502 | } | |
97fb6912 | 1503 | } else { |
e07e21ad | 1504 | debug("channel %d: connection failed: %s", |
d18e0850 | 1505 | c->self, strerror(err)); |
e07e21ad | 1506 | /* Try next address, if any */ |
1507 | if ((sock = connect_next(&c->connect_ctx)) > 0) { | |
1508 | close(c->sock); | |
1509 | c->sock = c->rfd = c->wfd = sock; | |
1510 | channel_max_fd = channel_find_maxfd(); | |
1511 | return; | |
1512 | } | |
1513 | /* Exhausted all addresses */ | |
1514 | error("connect_to %.100s port %d: failed.", | |
1515 | c->connect_ctx.host, c->connect_ctx.port); | |
1516 | channel_connect_ctx_free(&c->connect_ctx); | |
d18e0850 | 1517 | if (compat20) { |
1518 | packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); | |
1519 | packet_put_int(c->remote_id); | |
1520 | packet_put_int(SSH2_OPEN_CONNECT_FAILED); | |
1521 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { | |
1522 | packet_put_cstring(strerror(err)); | |
1523 | packet_put_cstring(""); | |
1524 | } | |
97fb6912 | 1525 | } else { |
d18e0850 | 1526 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
1527 | packet_put_int(c->remote_id); | |
97fb6912 | 1528 | } |
d18e0850 | 1529 | chan_mark_dead(c); |
97fb6912 | 1530 | } |
d18e0850 | 1531 | packet_send(); |
97fb6912 | 1532 | } |
1533 | } | |
1534 | ||
ebb90778 | 1535 | /* ARGSUSED */ |
396c147e | 1536 | static int |
c8e9c167 | 1537 | channel_handle_rfd(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1538 | { |
fa1d7d85 | 1539 | char buf[CHAN_RBUF]; |
bd6a1355 | 1540 | int len, force; |
7368a6c8 | 1541 | |
bd6a1355 | 1542 | force = c->isatty && c->detach_close && c->istate != CHAN_INPUT_CLOSED; |
1543 | if (c->rfd != -1 && (force || FD_ISSET(c->rfd, readset))) { | |
ea8c44d9 | 1544 | errno = 0; |
7368a6c8 | 1545 | len = read(c->rfd, buf, sizeof(buf)); |
5a0c8771 | 1546 | if (len < 0 && (errno == EINTR || |
1547 | ((errno == EAGAIN || errno == EWOULDBLOCK) && !force))) | |
0fbe8c74 | 1548 | return 1; |
ea8c44d9 | 1549 | #ifndef PTY_ZEROREAD |
7368a6c8 | 1550 | if (len <= 0) { |
ea8c44d9 | 1551 | #else |
9c04d67d | 1552 | if ((!c->isatty && len <= 0) || |
1553 | (c->isatty && (len < 0 || (len == 0 && errno != 0)))) { | |
ea8c44d9 | 1554 | #endif |
d7ac5f18 | 1555 | debug2("channel %d: read<=0 rfd %d len %d", |
7368a6c8 | 1556 | c->self, c->rfd, len); |
28b9cb4d | 1557 | if (c->type != SSH_CHANNEL_OPEN) { |
d7ac5f18 | 1558 | debug2("channel %d: not open", c->self); |
719fc62f | 1559 | chan_mark_dead(c); |
0490e609 | 1560 | return -1; |
28b9cb4d | 1561 | } else if (compat13) { |
9c50edcf | 1562 | buffer_clear(&c->output); |
7368a6c8 | 1563 | c->type = SSH_CHANNEL_INPUT_DRAINING; |
d7ac5f18 | 1564 | debug2("channel %d: input draining.", c->self); |
7368a6c8 | 1565 | } else { |
1566 | chan_read_failed(c); | |
5260325f | 1567 | } |
7368a6c8 | 1568 | return -1; |
1569 | } | |
6aacefa7 | 1570 | if (c->input_filter != NULL) { |
2e73a022 | 1571 | if (c->input_filter(c, buf, len) == -1) { |
d7ac5f18 | 1572 | debug2("channel %d: filter stops", c->self); |
2e73a022 | 1573 | chan_read_failed(c); |
1574 | } | |
d20f3c9e | 1575 | } else if (c->datagram) { |
1576 | buffer_put_string(&c->input, buf, len); | |
2e73a022 | 1577 | } else { |
1578 | buffer_append(&c->input, buf, len); | |
1579 | } | |
7368a6c8 | 1580 | } |
1581 | return 1; | |
1582 | } | |
a7137f6b | 1583 | |
ebb90778 | 1584 | /* ARGSUSED */ |
396c147e | 1585 | static int |
c8e9c167 | 1586 | channel_handle_wfd(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1587 | { |
95ce5599 | 1588 | struct termios tio; |
c1c6a032 | 1589 | u_char *data = NULL, *buf; |
780a9951 | 1590 | u_int dlen; |
7368a6c8 | 1591 | int len; |
1592 | ||
1593 | /* Send buffered output data to the socket. */ | |
6fd8622b | 1594 | if (c->wfd != -1 && |
7368a6c8 | 1595 | FD_ISSET(c->wfd, writeset) && |
1596 | buffer_len(&c->output) > 0) { | |
c1c6a032 | 1597 | if (c->output_filter != NULL) { |
1598 | if ((buf = c->output_filter(c, &data, &dlen)) == NULL) { | |
1599 | debug2("channel %d: filter stops", c->self); | |
d7b37427 | 1600 | if (c->type != SSH_CHANNEL_OPEN) |
1601 | chan_mark_dead(c); | |
1602 | else | |
1603 | chan_write_failed(c); | |
1604 | return -1; | |
c1c6a032 | 1605 | } |
1606 | } else if (c->datagram) { | |
1607 | buf = data = buffer_get_string(&c->output, &dlen); | |
1608 | } else { | |
1609 | buf = data = buffer_ptr(&c->output); | |
1610 | dlen = buffer_len(&c->output); | |
1611 | } | |
1612 | ||
d20f3c9e | 1613 | if (c->datagram) { |
d20f3c9e | 1614 | /* ignore truncated writes, datagrams might get lost */ |
1615 | c->local_consumed += dlen + 4; | |
c1c6a032 | 1616 | len = write(c->wfd, buf, dlen); |
d20f3c9e | 1617 | xfree(data); |
5a0c8771 | 1618 | if (len < 0 && (errno == EINTR || errno == EAGAIN || |
1619 | errno == EWOULDBLOCK)) | |
d20f3c9e | 1620 | return 1; |
1621 | if (len <= 0) { | |
1622 | if (c->type != SSH_CHANNEL_OPEN) | |
1623 | chan_mark_dead(c); | |
1624 | else | |
1625 | chan_write_failed(c); | |
1626 | return -1; | |
1627 | } | |
1628 | return 1; | |
1629 | } | |
64c0ce80 | 1630 | #ifdef _AIX |
aff51935 | 1631 | /* XXX: Later AIX versions can't push as much data to tty */ |
7fbb4189 | 1632 | if (compat20 && c->wfd_isatty) |
1633 | dlen = MIN(dlen, 8*1024); | |
64c0ce80 | 1634 | #endif |
c1c6a032 | 1635 | |
1636 | len = write(c->wfd, buf, dlen); | |
5a0c8771 | 1637 | if (len < 0 && |
1638 | (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK)) | |
0fbe8c74 | 1639 | return 1; |
7368a6c8 | 1640 | if (len <= 0) { |
28b9cb4d | 1641 | if (c->type != SSH_CHANNEL_OPEN) { |
d7ac5f18 | 1642 | debug2("channel %d: not open", c->self); |
719fc62f | 1643 | chan_mark_dead(c); |
28b9cb4d | 1644 | return -1; |
1645 | } else if (compat13) { | |
9c50edcf | 1646 | buffer_clear(&c->output); |
d7ac5f18 | 1647 | debug2("channel %d: input draining.", c->self); |
7368a6c8 | 1648 | c->type = SSH_CHANNEL_INPUT_DRAINING; |
1649 | } else { | |
1650 | chan_write_failed(c); | |
5260325f | 1651 | } |
7368a6c8 | 1652 | return -1; |
1653 | } | |
5e934f78 | 1654 | #ifndef BROKEN_TCGETATTR_ICANON |
c1c6a032 | 1655 | if (compat20 && c->isatty && dlen >= 1 && buf[0] != '\r') { |
0ae4fe1d | 1656 | if (tcgetattr(c->wfd, &tio) == 0 && |
1657 | !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) { | |
1658 | /* | |
1659 | * Simulate echo to reduce the impact of | |
355724fc | 1660 | * traffic analysis. We need to match the |
95ce5599 | 1661 | * size of a SSH2_MSG_CHANNEL_DATA message |
c1c6a032 | 1662 | * (4 byte channel id + buf) |
0ae4fe1d | 1663 | */ |
95ce5599 | 1664 | packet_send_ignore(4 + len); |
0ae4fe1d | 1665 | packet_send(); |
0ae4fe1d | 1666 | } |
1667 | } | |
5e934f78 | 1668 | #endif |
7368a6c8 | 1669 | buffer_consume(&c->output, len); |
7e7327a1 | 1670 | if (compat20 && len > 0) { |
1671 | c->local_consumed += len; | |
1672 | } | |
1673 | } | |
1674 | return 1; | |
1675 | } | |
a7137f6b | 1676 | |
396c147e | 1677 | static int |
c8e9c167 | 1678 | channel_handle_efd(Channel *c, fd_set *readset, fd_set *writeset) |
7e7327a1 | 1679 | { |
fa1d7d85 | 1680 | char buf[CHAN_RBUF]; |
7e7327a1 | 1681 | int len; |
1682 | ||
8ce64345 | 1683 | /** XXX handle drain efd, too */ |
7e7327a1 | 1684 | if (c->efd != -1) { |
1685 | if (c->extended_usage == CHAN_EXTENDED_WRITE && | |
1686 | FD_ISSET(c->efd, writeset) && | |
1687 | buffer_len(&c->extended) > 0) { | |
1688 | len = write(c->efd, buffer_ptr(&c->extended), | |
1689 | buffer_len(&c->extended)); | |
de273eef | 1690 | debug2("channel %d: written %d to efd %d", |
7e7327a1 | 1691 | c->self, len, c->efd); |
5a0c8771 | 1692 | if (len < 0 && (errno == EINTR || errno == EAGAIN || |
1693 | errno == EWOULDBLOCK)) | |
ee55dacf | 1694 | return 1; |
1695 | if (len <= 0) { | |
1696 | debug2("channel %d: closing write-efd %d", | |
1697 | c->self, c->efd); | |
489aa2e9 | 1698 | channel_close_fd(&c->efd); |
ee55dacf | 1699 | } else { |
7e7327a1 | 1700 | buffer_consume(&c->extended, len); |
1701 | c->local_consumed += len; | |
1702 | } | |
1703 | } else if (c->extended_usage == CHAN_EXTENDED_READ && | |
34640ce6 | 1704 | (c->detach_close || FD_ISSET(c->efd, readset))) { |
7e7327a1 | 1705 | len = read(c->efd, buf, sizeof(buf)); |
de273eef | 1706 | debug2("channel %d: read %d from efd %d", |
184eed6a | 1707 | c->self, len, c->efd); |
5a0c8771 | 1708 | if (len < 0 && (errno == EINTR || ((errno == EAGAIN || |
1709 | errno == EWOULDBLOCK) && !c->detach_close))) | |
ee55dacf | 1710 | return 1; |
1711 | if (len <= 0) { | |
1712 | debug2("channel %d: closing read-efd %d", | |
8ce64345 | 1713 | c->self, c->efd); |
489aa2e9 | 1714 | channel_close_fd(&c->efd); |
ee55dacf | 1715 | } else { |
7e7327a1 | 1716 | buffer_append(&c->extended, buf, len); |
ee55dacf | 1717 | } |
7e7327a1 | 1718 | } |
1719 | } | |
1720 | return 1; | |
1721 | } | |
a7137f6b | 1722 | |
ebb90778 | 1723 | /* ARGSUSED */ |
396c147e | 1724 | static int |
c8e9c167 | 1725 | channel_handle_ctl(Channel *c, fd_set *readset, fd_set *writeset) |
5e96b616 | 1726 | { |
1727 | char buf[16]; | |
1728 | int len; | |
1729 | ||
1730 | /* Monitor control fd to detect if the slave client exits */ | |
1731 | if (c->ctl_fd != -1 && FD_ISSET(c->ctl_fd, readset)) { | |
1732 | len = read(c->ctl_fd, buf, sizeof(buf)); | |
5a0c8771 | 1733 | if (len < 0 && |
1734 | (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK)) | |
5e96b616 | 1735 | return 1; |
1736 | if (len <= 0) { | |
1737 | debug2("channel %d: ctl read<=0", c->self); | |
1738 | if (c->type != SSH_CHANNEL_OPEN) { | |
1739 | debug2("channel %d: not open", c->self); | |
1740 | chan_mark_dead(c); | |
1741 | return -1; | |
1742 | } else { | |
1743 | chan_read_failed(c); | |
1744 | chan_write_failed(c); | |
1745 | } | |
1746 | return -1; | |
1747 | } else | |
1748 | fatal("%s: unexpected data on ctl fd", __func__); | |
1749 | } | |
1750 | return 1; | |
1751 | } | |
a7137f6b | 1752 | |
5e96b616 | 1753 | static int |
ee55dacf | 1754 | channel_check_window(Channel *c) |
7e7327a1 | 1755 | { |
28b9cb4d | 1756 | if (c->type == SSH_CHANNEL_OPEN && |
1757 | !(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) && | |
d9245683 | 1758 | ((c->local_window_max - c->local_window > |
68a73f53 | 1759 | c->local_maxpacket*3) || |
1760 | c->local_window < c->local_window_max/2) && | |
7e7327a1 | 1761 | c->local_consumed > 0) { |
1762 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); | |
1763 | packet_put_int(c->remote_id); | |
1764 | packet_put_int(c->local_consumed); | |
1765 | packet_send(); | |
de273eef | 1766 | debug2("channel %d: window %d sent adjust %d", |
7e7327a1 | 1767 | c->self, c->local_window, |
1768 | c->local_consumed); | |
1769 | c->local_window += c->local_consumed; | |
1770 | c->local_consumed = 0; | |
7368a6c8 | 1771 | } |
1772 | return 1; | |
1773 | } | |
5260325f | 1774 | |
396c147e | 1775 | static void |
c8e9c167 | 1776 | channel_post_open(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1777 | { |
1778 | channel_handle_rfd(c, readset, writeset); | |
1779 | channel_handle_wfd(c, readset, writeset); | |
0c0738d5 | 1780 | if (!compat20) |
639cb8ab | 1781 | return; |
7e7327a1 | 1782 | channel_handle_efd(c, readset, writeset); |
5e96b616 | 1783 | channel_handle_ctl(c, readset, writeset); |
ee55dacf | 1784 | channel_check_window(c); |
7e7327a1 | 1785 | } |
1786 | ||
ebb90778 | 1787 | /* ARGSUSED */ |
396c147e | 1788 | static void |
c8e9c167 | 1789 | channel_post_output_drain_13(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1790 | { |
1791 | int len; | |
e1feb9bf | 1792 | |
7368a6c8 | 1793 | /* Send buffered output data to the socket. */ |
1794 | if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) { | |
1795 | len = write(c->sock, buffer_ptr(&c->output), | |
1796 | buffer_len(&c->output)); | |
1797 | if (len <= 0) | |
9c50edcf | 1798 | buffer_clear(&c->output); |
7368a6c8 | 1799 | else |
1800 | buffer_consume(&c->output, len); | |
1801 | } | |
1802 | } | |
5260325f | 1803 | |
396c147e | 1804 | static void |
7e7327a1 | 1805 | channel_handler_init_20(void) |
1806 | { | |
0c0738d5 | 1807 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open; |
0b242b12 | 1808 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
7e7327a1 | 1809 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; |
fa08c86b | 1810 | channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener; |
0b242b12 | 1811 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
fa08c86b | 1812 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; |
97fb6912 | 1813 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1814 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7e7327a1 | 1815 | |
0c0738d5 | 1816 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
7e7327a1 | 1817 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; |
fa08c86b | 1818 | channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener; |
0b242b12 | 1819 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
fa08c86b | 1820 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; |
97fb6912 | 1821 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 1822 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
7e7327a1 | 1823 | } |
1824 | ||
396c147e | 1825 | static void |
7368a6c8 | 1826 | channel_handler_init_13(void) |
1827 | { | |
1828 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13; | |
1829 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_13; | |
1830 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; | |
1831 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; | |
1832 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; | |
1833 | channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining; | |
1834 | channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining; | |
97fb6912 | 1835 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1836 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7368a6c8 | 1837 | |
0c0738d5 | 1838 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
7368a6c8 | 1839 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
1840 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; | |
1841 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; | |
1842 | channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13; | |
97fb6912 | 1843 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 1844 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
7368a6c8 | 1845 | } |
5260325f | 1846 | |
396c147e | 1847 | static void |
7368a6c8 | 1848 | channel_handler_init_15(void) |
1849 | { | |
0c0738d5 | 1850 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open; |
0b242b12 | 1851 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
7368a6c8 | 1852 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
1853 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; | |
1854 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; | |
97fb6912 | 1855 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1856 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7368a6c8 | 1857 | |
1858 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; | |
1859 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; | |
1860 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; | |
0c0738d5 | 1861 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
97fb6912 | 1862 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 1863 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
7368a6c8 | 1864 | } |
1865 | ||
396c147e | 1866 | static void |
7368a6c8 | 1867 | channel_handler_init(void) |
1868 | { | |
1869 | int i; | |
e1feb9bf | 1870 | |
184eed6a | 1871 | for (i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) { |
7368a6c8 | 1872 | channel_pre[i] = NULL; |
1873 | channel_post[i] = NULL; | |
1874 | } | |
7e7327a1 | 1875 | if (compat20) |
1876 | channel_handler_init_20(); | |
1877 | else if (compat13) | |
7368a6c8 | 1878 | channel_handler_init_13(); |
1879 | else | |
1880 | channel_handler_init_15(); | |
1881 | } | |
1882 | ||
418e724c | 1883 | /* gc dead channels */ |
1884 | static void | |
1885 | channel_garbage_collect(Channel *c) | |
1886 | { | |
1887 | if (c == NULL) | |
1888 | return; | |
1889 | if (c->detach_user != NULL) { | |
8cd0437d | 1890 | if (!chan_is_dead(c, c->detach_close)) |
418e724c | 1891 | return; |
d7ac5f18 | 1892 | debug2("channel %d: gc: notify user", c->self); |
418e724c | 1893 | c->detach_user(c->self, NULL); |
1894 | /* if we still have a callback */ | |
1895 | if (c->detach_user != NULL) | |
1896 | return; | |
d7ac5f18 | 1897 | debug2("channel %d: gc: user detached", c->self); |
418e724c | 1898 | } |
1899 | if (!chan_is_dead(c, 1)) | |
1900 | return; | |
d7ac5f18 | 1901 | debug2("channel %d: garbage collecting", c->self); |
418e724c | 1902 | channel_free(c); |
1903 | } | |
1904 | ||
396c147e | 1905 | static void |
c8e9c167 | 1906 | channel_handler(chan_fn *ftab[], fd_set *readset, fd_set *writeset) |
7368a6c8 | 1907 | { |
1908 | static int did_init = 0; | |
7501ed0d | 1909 | u_int i, oalloc; |
7368a6c8 | 1910 | Channel *c; |
1911 | ||
1912 | if (!did_init) { | |
1913 | channel_handler_init(); | |
1914 | did_init = 1; | |
1915 | } | |
7501ed0d | 1916 | for (i = 0, oalloc = channels_alloc; i < oalloc; i++) { |
719fc62f | 1917 | c = channels[i]; |
1918 | if (c == NULL) | |
5260325f | 1919 | continue; |
7501ed0d | 1920 | if (c->delayed) { |
1921 | if (ftab == channel_pre) | |
1922 | c->delayed = 0; | |
1923 | else | |
1924 | continue; | |
1925 | } | |
6fd8622b | 1926 | if (ftab[c->type] != NULL) |
1927 | (*ftab[c->type])(c, readset, writeset); | |
418e724c | 1928 | channel_garbage_collect(c); |
8efc0c15 | 1929 | } |
8efc0c15 | 1930 | } |
1931 | ||
8e7895b8 | 1932 | /* |
1933 | * Allocate/update select bitmasks and add any bits relevant to channels in | |
1934 | * select bitmasks. | |
1935 | */ | |
6ae2364d | 1936 | void |
c422989b | 1937 | channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp, |
9a995072 | 1938 | u_int *nallocp, int rekeying) |
7368a6c8 | 1939 | { |
c5d10563 | 1940 | u_int n, sz, nfdset; |
39929cdb | 1941 | |
1942 | n = MAX(*maxfdp, channel_max_fd); | |
1943 | ||
c5d10563 | 1944 | nfdset = howmany(n+1, NFDBITS); |
1945 | /* Explicitly test here, because xrealloc isn't always called */ | |
1946 | if (nfdset && SIZE_T_MAX / nfdset < sizeof(fd_mask)) | |
1947 | fatal("channel_prepare_select: max_fd (%d) is too large", n); | |
1948 | sz = nfdset * sizeof(fd_mask); | |
1949 | ||
489aa2e9 | 1950 | /* perhaps check sz < nalloc/2 and shrink? */ |
1951 | if (*readsetp == NULL || sz > *nallocp) { | |
c5d10563 | 1952 | *readsetp = xrealloc(*readsetp, nfdset, sizeof(fd_mask)); |
1953 | *writesetp = xrealloc(*writesetp, nfdset, sizeof(fd_mask)); | |
489aa2e9 | 1954 | *nallocp = sz; |
39929cdb | 1955 | } |
489aa2e9 | 1956 | *maxfdp = n; |
39929cdb | 1957 | memset(*readsetp, 0, sz); |
1958 | memset(*writesetp, 0, sz); | |
1959 | ||
c422989b | 1960 | if (!rekeying) |
1961 | channel_handler(channel_pre, *readsetp, *writesetp); | |
7368a6c8 | 1962 | } |
1963 | ||
8e7895b8 | 1964 | /* |
1965 | * After select, perform any appropriate operations for channels which have | |
1966 | * events pending. | |
1967 | */ | |
6ae2364d | 1968 | void |
c8e9c167 | 1969 | channel_after_select(fd_set *readset, fd_set *writeset) |
7368a6c8 | 1970 | { |
1971 | channel_handler(channel_post, readset, writeset); | |
1972 | } | |
1973 | ||
8e7895b8 | 1974 | |
39929cdb | 1975 | /* If there is data to send to the connection, enqueue some of it now. */ |
6ae2364d | 1976 | void |
d5bb9418 | 1977 | channel_output_poll(void) |
8efc0c15 | 1978 | { |
7368a6c8 | 1979 | Channel *c; |
9a995072 | 1980 | u_int i, len; |
5260325f | 1981 | |
1982 | for (i = 0; i < channels_alloc; i++) { | |
719fc62f | 1983 | c = channels[i]; |
1984 | if (c == NULL) | |
1985 | continue; | |
48e671d5 | 1986 | |
8e7895b8 | 1987 | /* |
1988 | * We are only interested in channels that can have buffered | |
1989 | * incoming data. | |
1990 | */ | |
48e671d5 | 1991 | if (compat13) { |
7368a6c8 | 1992 | if (c->type != SSH_CHANNEL_OPEN && |
1993 | c->type != SSH_CHANNEL_INPUT_DRAINING) | |
48e671d5 | 1994 | continue; |
1995 | } else { | |
7368a6c8 | 1996 | if (c->type != SSH_CHANNEL_OPEN) |
48e671d5 | 1997 | continue; |
48e671d5 | 1998 | } |
e78a59f5 | 1999 | if (compat20 && |
2000 | (c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) { | |
ee55dacf | 2001 | /* XXX is this true? */ |
418e724c | 2002 | debug3("channel %d: will not send data after close", c->self); |
7e7327a1 | 2003 | continue; |
2004 | } | |
5260325f | 2005 | |
2006 | /* Get the amount of buffered data for this channel. */ | |
ee55dacf | 2007 | if ((c->istate == CHAN_INPUT_OPEN || |
2008 | c->istate == CHAN_INPUT_WAIT_DRAIN) && | |
2009 | (len = buffer_len(&c->input)) > 0) { | |
d20f3c9e | 2010 | if (c->datagram) { |
2011 | if (len > 0) { | |
2012 | u_char *data; | |
2013 | u_int dlen; | |
2014 | ||
2015 | data = buffer_get_string(&c->input, | |
2016 | &dlen); | |
2017 | packet_start(SSH2_MSG_CHANNEL_DATA); | |
2018 | packet_put_int(c->remote_id); | |
2019 | packet_put_string(data, dlen); | |
2020 | packet_send(); | |
2021 | c->remote_window -= dlen + 4; | |
2022 | xfree(data); | |
2023 | } | |
2024 | continue; | |
2025 | } | |
8e7895b8 | 2026 | /* |
2027 | * Send some data for the other side over the secure | |
2028 | * connection. | |
2029 | */ | |
7e7327a1 | 2030 | if (compat20) { |
2031 | if (len > c->remote_window) | |
2032 | len = c->remote_window; | |
2033 | if (len > c->remote_maxpacket) | |
2034 | len = c->remote_maxpacket; | |
5260325f | 2035 | } else { |
7e7327a1 | 2036 | if (packet_is_interactive()) { |
2037 | if (len > 1024) | |
2038 | len = 512; | |
2039 | } else { | |
2040 | /* Keep the packets at reasonable size. */ | |
2041 | if (len > packet_get_maxsize()/2) | |
2042 | len = packet_get_maxsize()/2; | |
2043 | } | |
5260325f | 2044 | } |
7368a6c8 | 2045 | if (len > 0) { |
7e7327a1 | 2046 | packet_start(compat20 ? |
2047 | SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA); | |
7368a6c8 | 2048 | packet_put_int(c->remote_id); |
2049 | packet_put_string(buffer_ptr(&c->input), len); | |
2050 | packet_send(); | |
2051 | buffer_consume(&c->input, len); | |
2052 | c->remote_window -= len; | |
7368a6c8 | 2053 | } |
2054 | } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) { | |
5260325f | 2055 | if (compat13) |
2056 | fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3"); | |
aa3378df | 2057 | /* |
2058 | * input-buffer is empty and read-socket shutdown: | |
d2296ed7 | 2059 | * tell peer, that we will not send more data: send IEOF. |
2060 | * hack for extended data: delay EOF if EFD still in use. | |
aa3378df | 2061 | */ |
d2296ed7 | 2062 | if (CHANNEL_EFD_INPUT_ACTIVE(c)) |
4e2e5cfd | 2063 | debug2("channel %d: ibuf_empty delayed efd %d/(%d)", |
2064 | c->self, c->efd, buffer_len(&c->extended)); | |
d2296ed7 | 2065 | else |
2066 | chan_ibuf_empty(c); | |
5260325f | 2067 | } |
7e7327a1 | 2068 | /* Send extended data, i.e. stderr */ |
2069 | if (compat20 && | |
d2296ed7 | 2070 | !(c->flags & CHAN_EOF_SENT) && |
7e7327a1 | 2071 | c->remote_window > 0 && |
2072 | (len = buffer_len(&c->extended)) > 0 && | |
2073 | c->extended_usage == CHAN_EXTENDED_READ) { | |
f91d9a89 | 2074 | debug2("channel %d: rwin %u elen %u euse %d", |
ee55dacf | 2075 | c->self, c->remote_window, buffer_len(&c->extended), |
2076 | c->extended_usage); | |
7e7327a1 | 2077 | if (len > c->remote_window) |
2078 | len = c->remote_window; | |
2079 | if (len > c->remote_maxpacket) | |
2080 | len = c->remote_maxpacket; | |
2081 | packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA); | |
2082 | packet_put_int(c->remote_id); | |
2083 | packet_put_int(SSH2_EXTENDED_DATA_STDERR); | |
2084 | packet_put_string(buffer_ptr(&c->extended), len); | |
2085 | packet_send(); | |
2086 | buffer_consume(&c->extended, len); | |
2087 | c->remote_window -= len; | |
ee55dacf | 2088 | debug2("channel %d: sent ext data %d", c->self, len); |
7e7327a1 | 2089 | } |
8efc0c15 | 2090 | } |
8efc0c15 | 2091 | } |
2092 | ||
8e7895b8 | 2093 | |
2094 | /* -- protocol input */ | |
04aa9e67 | 2095 | |
2096 | /* ARGSUSED */ | |
6ae2364d | 2097 | void |
7819b5c3 | 2098 | channel_input_data(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2099 | { |
48e671d5 | 2100 | int id; |
5260325f | 2101 | char *data; |
1e3b8b07 | 2102 | u_int data_len; |
7368a6c8 | 2103 | Channel *c; |
5260325f | 2104 | |
2105 | /* Get the channel number and verify it. */ | |
48e671d5 | 2106 | id = packet_get_int(); |
7368a6c8 | 2107 | c = channel_lookup(id); |
2108 | if (c == NULL) | |
48e671d5 | 2109 | packet_disconnect("Received data for nonexistent channel %d.", id); |
5260325f | 2110 | |
2111 | /* Ignore any data for non-open channels (might happen on close) */ | |
7368a6c8 | 2112 | if (c->type != SSH_CHANNEL_OPEN && |
2113 | c->type != SSH_CHANNEL_X11_OPEN) | |
48e671d5 | 2114 | return; |
2115 | ||
5260325f | 2116 | /* Get the data. */ |
17f02f0a | 2117 | data = packet_get_string_ptr(&data_len); |
7368a6c8 | 2118 | |
7741e239 | 2119 | /* |
2120 | * Ignore data for protocol > 1.3 if output end is no longer open. | |
2121 | * For protocol 2 the sending side is reducing its window as it sends | |
2122 | * data, so we must 'fake' consumption of the data in order to ensure | |
2123 | * that window updates are sent back. Otherwise the connection might | |
2124 | * deadlock. | |
2125 | */ | |
2126 | if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN) { | |
2127 | if (compat20) { | |
2128 | c->local_window -= data_len; | |
2129 | c->local_consumed += data_len; | |
2130 | } | |
7741e239 | 2131 | return; |
2132 | } | |
2133 | ||
6aacefa7 | 2134 | if (compat20) { |
7e7327a1 | 2135 | if (data_len > c->local_maxpacket) { |
bbe88b6d | 2136 | logit("channel %d: rcvd big packet %d, maxpack %d", |
7e7327a1 | 2137 | c->self, data_len, c->local_maxpacket); |
2138 | } | |
2139 | if (data_len > c->local_window) { | |
bbe88b6d | 2140 | logit("channel %d: rcvd too much data %d, win %d", |
7e7327a1 | 2141 | c->self, data_len, c->local_window); |
7e7327a1 | 2142 | return; |
2143 | } | |
2144 | c->local_window -= data_len; | |
7e7327a1 | 2145 | } |
d20f3c9e | 2146 | if (c->datagram) |
2147 | buffer_put_string(&c->output, data, data_len); | |
2148 | else | |
2149 | buffer_append(&c->output, data, data_len); | |
17f02f0a | 2150 | packet_check_eom(); |
8efc0c15 | 2151 | } |
8e7895b8 | 2152 | |
04aa9e67 | 2153 | /* ARGSUSED */ |
6ae2364d | 2154 | void |
7819b5c3 | 2155 | channel_input_extended_data(int type, u_int32_t seq, void *ctxt) |
7e7327a1 | 2156 | { |
2157 | int id; | |
7e7327a1 | 2158 | char *data; |
a594fa74 | 2159 | u_int data_len, tcode; |
7e7327a1 | 2160 | Channel *c; |
2161 | ||
2162 | /* Get the channel number and verify it. */ | |
2163 | id = packet_get_int(); | |
2164 | c = channel_lookup(id); | |
2165 | ||
2166 | if (c == NULL) | |
2167 | packet_disconnect("Received extended_data for bad channel %d.", id); | |
2168 | if (c->type != SSH_CHANNEL_OPEN) { | |
bbe88b6d | 2169 | logit("channel %d: ext data for non open", id); |
7e7327a1 | 2170 | return; |
2171 | } | |
d2296ed7 | 2172 | if (c->flags & CHAN_EOF_RCVD) { |
2173 | if (datafellows & SSH_BUG_EXTEOF) | |
2174 | debug("channel %d: accepting ext data after eof", id); | |
2175 | else | |
2176 | packet_disconnect("Received extended_data after EOF " | |
2177 | "on channel %d.", id); | |
2178 | } | |
7e7327a1 | 2179 | tcode = packet_get_int(); |
2180 | if (c->efd == -1 || | |
2181 | c->extended_usage != CHAN_EXTENDED_WRITE || | |
2182 | tcode != SSH2_EXTENDED_DATA_STDERR) { | |
bbe88b6d | 2183 | logit("channel %d: bad ext data", c->self); |
7e7327a1 | 2184 | return; |
2185 | } | |
2186 | data = packet_get_string(&data_len); | |
95500969 | 2187 | packet_check_eom(); |
7e7327a1 | 2188 | if (data_len > c->local_window) { |
bbe88b6d | 2189 | logit("channel %d: rcvd too much extended_data %d, win %d", |
7e7327a1 | 2190 | c->self, data_len, c->local_window); |
2191 | xfree(data); | |
2192 | return; | |
2193 | } | |
de273eef | 2194 | debug2("channel %d: rcvd ext data %d", c->self, data_len); |
7e7327a1 | 2195 | c->local_window -= data_len; |
2196 | buffer_append(&c->extended, data, data_len); | |
2197 | xfree(data); | |
2198 | } | |
2199 | ||
04aa9e67 | 2200 | /* ARGSUSED */ |
6ae2364d | 2201 | void |
7819b5c3 | 2202 | channel_input_ieof(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 2203 | { |
2204 | int id; | |
2205 | Channel *c; | |
2206 | ||
7368a6c8 | 2207 | id = packet_get_int(); |
95500969 | 2208 | packet_check_eom(); |
7368a6c8 | 2209 | c = channel_lookup(id); |
2210 | if (c == NULL) | |
2211 | packet_disconnect("Received ieof for nonexistent channel %d.", id); | |
2212 | chan_rcvd_ieof(c); | |
a5f82435 | 2213 | |
2214 | /* XXX force input close */ | |
8341f420 | 2215 | if (c->force_drain && c->istate == CHAN_INPUT_OPEN) { |
a5f82435 | 2216 | debug("channel %d: FORCE input drain", c->self); |
2217 | c->istate = CHAN_INPUT_WAIT_DRAIN; | |
32e7d71f | 2218 | if (buffer_len(&c->input) == 0) |
2219 | chan_ibuf_empty(c); | |
a5f82435 | 2220 | } |
2221 | ||
7368a6c8 | 2222 | } |
8efc0c15 | 2223 | |
04aa9e67 | 2224 | /* ARGSUSED */ |
6ae2364d | 2225 | void |
7819b5c3 | 2226 | channel_input_close(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2227 | { |
7368a6c8 | 2228 | int id; |
2229 | Channel *c; | |
5260325f | 2230 | |
7368a6c8 | 2231 | id = packet_get_int(); |
95500969 | 2232 | packet_check_eom(); |
7368a6c8 | 2233 | c = channel_lookup(id); |
2234 | if (c == NULL) | |
2235 | packet_disconnect("Received close for nonexistent channel %d.", id); | |
aa3378df | 2236 | |
2237 | /* | |
2238 | * Send a confirmation that we have closed the channel and no more | |
2239 | * data is coming for it. | |
2240 | */ | |
5260325f | 2241 | packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION); |
7368a6c8 | 2242 | packet_put_int(c->remote_id); |
5260325f | 2243 | packet_send(); |
2244 | ||
aa3378df | 2245 | /* |
2246 | * If the channel is in closed state, we have sent a close request, | |
2247 | * and the other side will eventually respond with a confirmation. | |
2248 | * Thus, we cannot free the channel here, because then there would be | |
2249 | * no-one to receive the confirmation. The channel gets freed when | |
2250 | * the confirmation arrives. | |
2251 | */ | |
7368a6c8 | 2252 | if (c->type != SSH_CHANNEL_CLOSED) { |
aa3378df | 2253 | /* |
2254 | * Not a closed channel - mark it as draining, which will | |
2255 | * cause it to be freed later. | |
2256 | */ | |
9c50edcf | 2257 | buffer_clear(&c->input); |
7368a6c8 | 2258 | c->type = SSH_CHANNEL_OUTPUT_DRAINING; |
5260325f | 2259 | } |
8efc0c15 | 2260 | } |
2261 | ||
7368a6c8 | 2262 | /* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */ |
04aa9e67 | 2263 | /* ARGSUSED */ |
6ae2364d | 2264 | void |
7819b5c3 | 2265 | channel_input_oclose(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2266 | { |
7368a6c8 | 2267 | int id = packet_get_int(); |
2268 | Channel *c = channel_lookup(id); | |
a8a21a53 | 2269 | |
95500969 | 2270 | packet_check_eom(); |
7368a6c8 | 2271 | if (c == NULL) |
2272 | packet_disconnect("Received oclose for nonexistent channel %d.", id); | |
2273 | chan_rcvd_oclose(c); | |
8efc0c15 | 2274 | } |
2275 | ||
04aa9e67 | 2276 | /* ARGSUSED */ |
6ae2364d | 2277 | void |
7819b5c3 | 2278 | channel_input_close_confirmation(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 2279 | { |
2280 | int id = packet_get_int(); | |
2281 | Channel *c = channel_lookup(id); | |
2282 | ||
95500969 | 2283 | packet_check_eom(); |
7368a6c8 | 2284 | if (c == NULL) |
2285 | packet_disconnect("Received close confirmation for " | |
2286 | "out-of-range channel %d.", id); | |
2287 | if (c->type != SSH_CHANNEL_CLOSED) | |
2288 | packet_disconnect("Received close confirmation for " | |
2289 | "non-closed channel %d (type %d).", id, c->type); | |
719fc62f | 2290 | channel_free(c); |
7368a6c8 | 2291 | } |
8efc0c15 | 2292 | |
04aa9e67 | 2293 | /* ARGSUSED */ |
6ae2364d | 2294 | void |
7819b5c3 | 2295 | channel_input_open_confirmation(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2296 | { |
7368a6c8 | 2297 | int id, remote_id; |
2298 | Channel *c; | |
5260325f | 2299 | |
7368a6c8 | 2300 | id = packet_get_int(); |
2301 | c = channel_lookup(id); | |
5260325f | 2302 | |
7368a6c8 | 2303 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) |
2304 | packet_disconnect("Received open confirmation for " | |
2305 | "non-opening channel %d.", id); | |
2306 | remote_id = packet_get_int(); | |
aa3378df | 2307 | /* Record the remote channel number and mark that the channel is now open. */ |
7368a6c8 | 2308 | c->remote_id = remote_id; |
2309 | c->type = SSH_CHANNEL_OPEN; | |
7e7327a1 | 2310 | |
2311 | if (compat20) { | |
2312 | c->remote_window = packet_get_int(); | |
2313 | c->remote_maxpacket = packet_get_int(); | |
3593bdc0 | 2314 | if (c->open_confirm) { |
de273eef | 2315 | debug2("callback start"); |
3593bdc0 | 2316 | c->open_confirm(c->self, c->open_confirm_ctx); |
de273eef | 2317 | debug2("callback done"); |
7e7327a1 | 2318 | } |
d7ac5f18 | 2319 | debug2("channel %d: open confirm rwindow %u rmax %u", c->self, |
7e7327a1 | 2320 | c->remote_window, c->remote_maxpacket); |
2321 | } | |
95500969 | 2322 | packet_check_eom(); |
8efc0c15 | 2323 | } |
2324 | ||
396c147e | 2325 | static char * |
d18e0850 | 2326 | reason2txt(int reason) |
2327 | { | |
6aacefa7 | 2328 | switch (reason) { |
d18e0850 | 2329 | case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED: |
2330 | return "administratively prohibited"; | |
2331 | case SSH2_OPEN_CONNECT_FAILED: | |
2332 | return "connect failed"; | |
2333 | case SSH2_OPEN_UNKNOWN_CHANNEL_TYPE: | |
2334 | return "unknown channel type"; | |
2335 | case SSH2_OPEN_RESOURCE_SHORTAGE: | |
2336 | return "resource shortage"; | |
2337 | } | |
7e8c18e9 | 2338 | return "unknown reason"; |
d18e0850 | 2339 | } |
2340 | ||
04aa9e67 | 2341 | /* ARGSUSED */ |
6ae2364d | 2342 | void |
7819b5c3 | 2343 | channel_input_open_failure(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2344 | { |
02a024dd | 2345 | int id, reason; |
2346 | char *msg = NULL, *lang = NULL; | |
7368a6c8 | 2347 | Channel *c; |
5260325f | 2348 | |
7368a6c8 | 2349 | id = packet_get_int(); |
2350 | c = channel_lookup(id); | |
2351 | ||
2352 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) | |
2353 | packet_disconnect("Received open failure for " | |
2354 | "non-opening channel %d.", id); | |
7e7327a1 | 2355 | if (compat20) { |
02a024dd | 2356 | reason = packet_get_int(); |
fbe90f7b | 2357 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { |
02a024dd | 2358 | msg = packet_get_string(NULL); |
2359 | lang = packet_get_string(NULL); | |
2360 | } | |
bbe88b6d | 2361 | logit("channel %d: open failed: %s%s%s", id, |
d18e0850 | 2362 | reason2txt(reason), msg ? ": ": "", msg ? msg : ""); |
02a024dd | 2363 | if (msg != NULL) |
2364 | xfree(msg); | |
2365 | if (lang != NULL) | |
2366 | xfree(lang); | |
7e7327a1 | 2367 | } |
95500969 | 2368 | packet_check_eom(); |
6cf44b6a | 2369 | /* Schedule the channel for cleanup/deletion. */ |
2370 | chan_mark_dead(c); | |
8efc0c15 | 2371 | } |
2372 | ||
04aa9e67 | 2373 | /* ARGSUSED */ |
8e7895b8 | 2374 | void |
7819b5c3 | 2375 | channel_input_window_adjust(int type, u_int32_t seq, void *ctxt) |
8e7895b8 | 2376 | { |
2377 | Channel *c; | |
f91d9a89 | 2378 | int id; |
2379 | u_int adjust; | |
3ffc6336 | 2380 | |
8e7895b8 | 2381 | if (!compat20) |
2382 | return; | |
8efc0c15 | 2383 | |
8e7895b8 | 2384 | /* Get the channel number and verify it. */ |
2385 | id = packet_get_int(); | |
2386 | c = channel_lookup(id); | |
2387 | ||
b872f7f0 | 2388 | if (c == NULL) { |
2389 | logit("Received window adjust for non-open channel %d.", id); | |
8e7895b8 | 2390 | return; |
2391 | } | |
2392 | adjust = packet_get_int(); | |
95500969 | 2393 | packet_check_eom(); |
f91d9a89 | 2394 | debug2("channel %d: rcvd adjust %u", id, adjust); |
8e7895b8 | 2395 | c->remote_window += adjust; |
2396 | } | |
2397 | ||
04aa9e67 | 2398 | /* ARGSUSED */ |
8e7895b8 | 2399 | void |
7819b5c3 | 2400 | channel_input_port_open(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2401 | { |
8e7895b8 | 2402 | Channel *c = NULL; |
2403 | u_short host_port; | |
2404 | char *host, *originator_string; | |
e07e21ad | 2405 | int remote_id; |
5260325f | 2406 | |
8e7895b8 | 2407 | remote_id = packet_get_int(); |
2408 | host = packet_get_string(NULL); | |
2409 | host_port = packet_get_int(); | |
2410 | ||
2411 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) { | |
2412 | originator_string = packet_get_string(NULL); | |
2413 | } else { | |
2414 | originator_string = xstrdup("unknown (remote did not supply name)"); | |
2415 | } | |
95500969 | 2416 | packet_check_eom(); |
e07e21ad | 2417 | c = channel_connect_to(host, host_port, |
2418 | "connected socket", originator_string); | |
0d942eff | 2419 | xfree(originator_string); |
e07e21ad | 2420 | xfree(host); |
8e7895b8 | 2421 | if (c == NULL) { |
2422 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
2423 | packet_put_int(remote_id); | |
2424 | packet_send(); | |
e07e21ad | 2425 | } else |
2426 | c->remote_id = remote_id; | |
8efc0c15 | 2427 | } |
2428 | ||
3593bdc0 | 2429 | /* ARGSUSED */ |
2430 | void | |
2431 | channel_input_status_confirm(int type, u_int32_t seq, void *ctxt) | |
2432 | { | |
2433 | Channel *c; | |
2434 | struct channel_confirm *cc; | |
b09b559d | 2435 | int id; |
3593bdc0 | 2436 | |
2437 | /* Reset keepalive timeout */ | |
dc1f1948 | 2438 | packet_set_alive_timeouts(0); |
3593bdc0 | 2439 | |
b09b559d | 2440 | id = packet_get_int(); |
3593bdc0 | 2441 | packet_check_eom(); |
2442 | ||
b09b559d | 2443 | debug2("channel_input_status_confirm: type %d id %d", type, id); |
3593bdc0 | 2444 | |
b09b559d | 2445 | if ((c = channel_lookup(id)) == NULL) { |
2446 | logit("channel_input_status_confirm: %d: unknown", id); | |
3593bdc0 | 2447 | return; |
2448 | } | |
2449 | ; | |
2450 | if ((cc = TAILQ_FIRST(&c->status_confirms)) == NULL) | |
2451 | return; | |
2452 | cc->cb(type, c, cc->ctx); | |
2453 | TAILQ_REMOVE(&c->status_confirms, cc, entry); | |
2454 | bzero(cc, sizeof(*cc)); | |
2455 | xfree(cc); | |
2456 | } | |
8e7895b8 | 2457 | |
2458 | /* -- tcp forwarding */ | |
2459 | ||
5e4a7219 | 2460 | void |
2461 | channel_set_af(int af) | |
2462 | { | |
2463 | IPv4or6 = af; | |
2464 | } | |
2465 | ||
5641aefa | 2466 | static int |
17525a70 | 2467 | channel_setup_fwd_listener(int type, const char *listen_addr, |
2468 | u_short listen_port, int *allocated_listen_port, | |
5641aefa | 2469 | const char *host_to_connect, u_short port_to_connect, int gateway_ports) |
8efc0c15 | 2470 | { |
719fc62f | 2471 | Channel *c; |
442aee3a | 2472 | int sock, r, success = 0, wildcard = 0, is_client; |
48e671d5 | 2473 | struct addrinfo hints, *ai, *aitop; |
3867aa0a | 2474 | const char *host, *addr; |
5641aefa | 2475 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
17525a70 | 2476 | in_port_t *lport_p; |
5260325f | 2477 | |
5641aefa | 2478 | host = (type == SSH_CHANNEL_RPORT_LISTENER) ? |
2479 | listen_addr : host_to_connect; | |
3867aa0a | 2480 | is_client = (type == SSH_CHANNEL_PORT_LISTENER); |
02a024dd | 2481 | |
5641aefa | 2482 | if (host == NULL) { |
2483 | error("No forward host name."); | |
38946c65 | 2484 | return 0; |
fa08c86b | 2485 | } |
920706fd | 2486 | if (strlen(host) >= NI_MAXHOST) { |
02a024dd | 2487 | error("Forward host name too long."); |
38946c65 | 2488 | return 0; |
02a024dd | 2489 | } |
5260325f | 2490 | |
3867aa0a | 2491 | /* |
2492 | * Determine whether or not a port forward listens to loopback, | |
f8cc7664 | 2493 | * specified address or wildcard. On the client, a specified bind |
2494 | * address will always override gateway_ports. On the server, a | |
2495 | * gateway_ports of 1 (``yes'') will override the client's | |
2496 | * specification and force a wildcard bind, whereas a value of 2 | |
2497 | * (``clientspecified'') will bind to whatever address the client | |
3867aa0a | 2498 | * asked for. |
2499 | * | |
2500 | * Special-case listen_addrs are: | |
2501 | * | |
2502 | * "0.0.0.0" -> wildcard v4/v6 if SSH_OLD_FORWARD_ADDR | |
2503 | * "" (empty string), "*" -> wildcard v4/v6 | |
2504 | * "localhost" -> loopback v4/v6 | |
2505 | */ | |
2506 | addr = NULL; | |
2507 | if (listen_addr == NULL) { | |
2508 | /* No address specified: default to gateway_ports setting */ | |
2509 | if (gateway_ports) | |
2510 | wildcard = 1; | |
2511 | } else if (gateway_ports || is_client) { | |
2512 | if (((datafellows & SSH_OLD_FORWARD_ADDR) && | |
bc4cc956 | 2513 | strcmp(listen_addr, "0.0.0.0") == 0 && is_client == 0) || |
3867aa0a | 2514 | *listen_addr == '\0' || strcmp(listen_addr, "*") == 0 || |
2515 | (!is_client && gateway_ports == 1)) | |
2516 | wildcard = 1; | |
2517 | else if (strcmp(listen_addr, "localhost") != 0) | |
2518 | addr = listen_addr; | |
2519 | } | |
2520 | ||
2521 | debug3("channel_setup_fwd_listener: type %d wildcard %d addr %s", | |
2522 | type, wildcard, (addr == NULL) ? "NULL" : addr); | |
2523 | ||
aa3378df | 2524 | /* |
48e671d5 | 2525 | * getaddrinfo returns a loopback address if the hostname is |
2526 | * set to NULL and hints.ai_flags is not AI_PASSIVE | |
aa3378df | 2527 | */ |
48e671d5 | 2528 | memset(&hints, 0, sizeof(hints)); |
2529 | hints.ai_family = IPv4or6; | |
3867aa0a | 2530 | hints.ai_flags = wildcard ? AI_PASSIVE : 0; |
48e671d5 | 2531 | hints.ai_socktype = SOCK_STREAM; |
fa08c86b | 2532 | snprintf(strport, sizeof strport, "%d", listen_port); |
3867aa0a | 2533 | if ((r = getaddrinfo(addr, strport, &hints, &aitop)) != 0) { |
2534 | if (addr == NULL) { | |
2535 | /* This really shouldn't happen */ | |
2536 | packet_disconnect("getaddrinfo: fatal error: %s", | |
bb4626fe | 2537 | ssh_gai_strerror(r)); |
3867aa0a | 2538 | } else { |
38946c65 | 2539 | error("channel_setup_fwd_listener: " |
bb4626fe | 2540 | "getaddrinfo(%.64s): %s", addr, |
2541 | ssh_gai_strerror(r)); | |
3867aa0a | 2542 | } |
38946c65 | 2543 | return 0; |
3867aa0a | 2544 | } |
17525a70 | 2545 | if (allocated_listen_port != NULL) |
2546 | *allocated_listen_port = 0; | |
48e671d5 | 2547 | for (ai = aitop; ai; ai = ai->ai_next) { |
17525a70 | 2548 | switch (ai->ai_family) { |
2549 | case AF_INET: | |
2550 | lport_p = &((struct sockaddr_in *)ai->ai_addr)-> | |
2551 | sin_port; | |
2552 | break; | |
2553 | case AF_INET6: | |
2554 | lport_p = &((struct sockaddr_in6 *)ai->ai_addr)-> | |
2555 | sin6_port; | |
2556 | break; | |
2557 | default: | |
48e671d5 | 2558 | continue; |
17525a70 | 2559 | } |
2560 | /* | |
2561 | * If allocating a port for -R forwards, then use the | |
2562 | * same port for all address families. | |
2563 | */ | |
2564 | if (type == SSH_CHANNEL_RPORT_LISTENER && listen_port == 0 && | |
2565 | allocated_listen_port != NULL && *allocated_listen_port > 0) | |
2566 | *lport_p = htons(*allocated_listen_port); | |
2567 | ||
48e671d5 | 2568 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), |
2569 | strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { | |
5641aefa | 2570 | error("channel_setup_fwd_listener: getnameinfo failed"); |
48e671d5 | 2571 | continue; |
2572 | } | |
2573 | /* Create a port to listen for the host. */ | |
16d64584 | 2574 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
48e671d5 | 2575 | if (sock < 0) { |
2576 | /* this is no error since kernel may not support ipv6 */ | |
2577 | verbose("socket: %.100s", strerror(errno)); | |
2578 | continue; | |
2579 | } | |
442aee3a | 2580 | |
2581 | channel_set_reuseaddr(sock); | |
4e1082aa | 2582 | if (ai->ai_family == AF_INET6) |
2583 | sock_set_v6only(sock); | |
facfd613 | 2584 | |
17525a70 | 2585 | debug("Local forwarding listening on %s port %s.", |
2586 | ntop, strport); | |
48e671d5 | 2587 | |
2588 | /* Bind the socket to the address. */ | |
2589 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { | |
2590 | /* address can be in use ipv6 address is already bound */ | |
16218745 | 2591 | if (!ai->ai_next) |
2592 | error("bind: %.100s", strerror(errno)); | |
2593 | else | |
2594 | verbose("bind: %.100s", strerror(errno)); | |
2b87da3b | 2595 | |
48e671d5 | 2596 | close(sock); |
2597 | continue; | |
2598 | } | |
2599 | /* Start listening for connections on the socket. */ | |
fce39749 | 2600 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { |
48e671d5 | 2601 | error("listen: %.100s", strerror(errno)); |
2602 | close(sock); | |
2603 | continue; | |
2604 | } | |
17525a70 | 2605 | |
2606 | /* | |
2607 | * listen_port == 0 requests a dynamically allocated port - | |
2608 | * record what we got. | |
2609 | */ | |
2610 | if (type == SSH_CHANNEL_RPORT_LISTENER && listen_port == 0 && | |
2611 | allocated_listen_port != NULL && | |
2612 | *allocated_listen_port == 0) { | |
2613 | *allocated_listen_port = get_sock_port(sock, 1); | |
2614 | debug("Allocated listen port %d", | |
2615 | *allocated_listen_port); | |
2616 | } | |
2617 | ||
48e671d5 | 2618 | /* Allocate a channel number for the socket. */ |
8e7895b8 | 2619 | c = channel_new("port listener", type, sock, sock, -1, |
0b242b12 | 2620 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, |
0d942eff | 2621 | 0, "port listener", 1); |
1338ba77 | 2622 | c->path = xstrdup(host); |
719fc62f | 2623 | c->host_port = port_to_connect; |
2624 | c->listening_port = listen_port; | |
48e671d5 | 2625 | success = 1; |
2626 | } | |
2627 | if (success == 0) | |
5641aefa | 2628 | error("channel_setup_fwd_listener: cannot listen to port: %d", |
02a024dd | 2629 | listen_port); |
48e671d5 | 2630 | freeaddrinfo(aitop); |
02a024dd | 2631 | return success; |
5260325f | 2632 | } |
8efc0c15 | 2633 | |
d740ec16 | 2634 | int |
2635 | channel_cancel_rport_listener(const char *host, u_short port) | |
2636 | { | |
9a995072 | 2637 | u_int i; |
2638 | int found = 0; | |
d740ec16 | 2639 | |
f8cc7664 | 2640 | for (i = 0; i < channels_alloc; i++) { |
d740ec16 | 2641 | Channel *c = channels[i]; |
2642 | ||
2643 | if (c != NULL && c->type == SSH_CHANNEL_RPORT_LISTENER && | |
1338ba77 | 2644 | strcmp(c->path, host) == 0 && c->listening_port == port) { |
2912cbd6 | 2645 | debug2("%s: close channel %d", __func__, i); |
d740ec16 | 2646 | channel_free(c); |
2647 | found = 1; | |
2648 | } | |
2649 | } | |
2650 | ||
2651 | return (found); | |
2652 | } | |
2653 | ||
5641aefa | 2654 | /* protocol local port fwd, used by ssh (and sshd in v1) */ |
2655 | int | |
3867aa0a | 2656 | channel_setup_local_fwd_listener(const char *listen_host, u_short listen_port, |
5641aefa | 2657 | const char *host_to_connect, u_short port_to_connect, int gateway_ports) |
2658 | { | |
2659 | return channel_setup_fwd_listener(SSH_CHANNEL_PORT_LISTENER, | |
17525a70 | 2660 | listen_host, listen_port, NULL, host_to_connect, port_to_connect, |
3867aa0a | 2661 | gateway_ports); |
5641aefa | 2662 | } |
2663 | ||
2664 | /* protocol v2 remote port fwd, used by sshd */ | |
2665 | int | |
2666 | channel_setup_remote_fwd_listener(const char *listen_address, | |
17525a70 | 2667 | u_short listen_port, int *allocated_listen_port, int gateway_ports) |
5641aefa | 2668 | { |
2669 | return channel_setup_fwd_listener(SSH_CHANNEL_RPORT_LISTENER, | |
17525a70 | 2670 | listen_address, listen_port, allocated_listen_port, |
2671 | NULL, 0, gateway_ports); | |
5641aefa | 2672 | } |
2673 | ||
aa3378df | 2674 | /* |
2675 | * Initiate forwarding of connections to port "port" on remote host through | |
2676 | * the secure channel to host:port from local side. | |
2677 | */ | |
8efc0c15 | 2678 | |
42ea6f5e | 2679 | int |
3867aa0a | 2680 | channel_request_remote_forwarding(const char *listen_host, u_short listen_port, |
fa08c86b | 2681 | const char *host_to_connect, u_short port_to_connect) |
8efc0c15 | 2682 | { |
54a5250f | 2683 | int type, success = 0; |
fa08c86b | 2684 | |
5260325f | 2685 | /* Record locally that connection to this host/port is permitted. */ |
2686 | if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
2687 | fatal("channel_request_remote_forwarding: too many forwards"); | |
2688 | ||
5260325f | 2689 | /* Send the forward request to the remote side. */ |
7e7327a1 | 2690 | if (compat20) { |
3867aa0a | 2691 | const char *address_to_bind; |
04efe9b0 | 2692 | if (listen_host == NULL) { |
2693 | if (datafellows & SSH_BUG_RFWD_ADDR) | |
2694 | address_to_bind = "127.0.0.1"; | |
2695 | else | |
2696 | address_to_bind = "localhost"; | |
2697 | } else if (*listen_host == '\0' || | |
2698 | strcmp(listen_host, "*") == 0) { | |
2699 | if (datafellows & SSH_BUG_RFWD_ADDR) | |
2700 | address_to_bind = "0.0.0.0"; | |
2701 | else | |
2702 | address_to_bind = ""; | |
2703 | } else | |
3867aa0a | 2704 | address_to_bind = listen_host; |
2705 | ||
7e7327a1 | 2706 | packet_start(SSH2_MSG_GLOBAL_REQUEST); |
2707 | packet_put_cstring("tcpip-forward"); | |
e0ae8728 | 2708 | packet_put_char(1); /* boolean: want reply */ |
7e7327a1 | 2709 | packet_put_cstring(address_to_bind); |
2710 | packet_put_int(listen_port); | |
fa08c86b | 2711 | packet_send(); |
2712 | packet_write_wait(); | |
2713 | /* Assume that server accepts the request */ | |
2714 | success = 1; | |
7e7327a1 | 2715 | } else { |
2716 | packet_start(SSH_CMSG_PORT_FORWARD_REQUEST); | |
7e7327a1 | 2717 | packet_put_int(listen_port); |
d6f24e45 | 2718 | packet_put_cstring(host_to_connect); |
2719 | packet_put_int(port_to_connect); | |
7e7327a1 | 2720 | packet_send(); |
2721 | packet_write_wait(); | |
fa08c86b | 2722 | |
2723 | /* Wait for response from the remote side. */ | |
54a5250f | 2724 | type = packet_read(); |
fa08c86b | 2725 | switch (type) { |
2726 | case SSH_SMSG_SUCCESS: | |
2727 | success = 1; | |
2728 | break; | |
2729 | case SSH_SMSG_FAILURE: | |
fa08c86b | 2730 | break; |
2731 | default: | |
2732 | /* Unknown packet */ | |
2733 | packet_disconnect("Protocol error for port forward request:" | |
2734 | "received packet type %d.", type); | |
2735 | } | |
2736 | } | |
2737 | if (success) { | |
2738 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host_to_connect); | |
2739 | permitted_opens[num_permitted_opens].port_to_connect = port_to_connect; | |
2740 | permitted_opens[num_permitted_opens].listen_port = listen_port; | |
2741 | num_permitted_opens++; | |
7e7327a1 | 2742 | } |
42ea6f5e | 2743 | return (success ? 0 : -1); |
8efc0c15 | 2744 | } |
2745 | ||
d740ec16 | 2746 | /* |
f2107e97 | 2747 | * Request cancellation of remote forwarding of connection host:port from |
d740ec16 | 2748 | * local side. |
2749 | */ | |
d740ec16 | 2750 | void |
3867aa0a | 2751 | channel_request_rforward_cancel(const char *host, u_short port) |
d740ec16 | 2752 | { |
2753 | int i; | |
d740ec16 | 2754 | |
2755 | if (!compat20) | |
2756 | return; | |
2757 | ||
2758 | for (i = 0; i < num_permitted_opens; i++) { | |
f2107e97 | 2759 | if (permitted_opens[i].host_to_connect != NULL && |
d740ec16 | 2760 | permitted_opens[i].listen_port == port) |
2761 | break; | |
2762 | } | |
2763 | if (i >= num_permitted_opens) { | |
2764 | debug("%s: requested forward not found", __func__); | |
2765 | return; | |
2766 | } | |
2767 | packet_start(SSH2_MSG_GLOBAL_REQUEST); | |
2768 | packet_put_cstring("cancel-tcpip-forward"); | |
2769 | packet_put_char(0); | |
3867aa0a | 2770 | packet_put_cstring(host == NULL ? "" : host); |
d740ec16 | 2771 | packet_put_int(port); |
2772 | packet_send(); | |
2773 | ||
2774 | permitted_opens[i].listen_port = 0; | |
2775 | permitted_opens[i].port_to_connect = 0; | |
8c4bd764 | 2776 | xfree(permitted_opens[i].host_to_connect); |
d740ec16 | 2777 | permitted_opens[i].host_to_connect = NULL; |
2778 | } | |
2779 | ||
aa3378df | 2780 | /* |
2781 | * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates | |
2782 | * listening for the port, and sends back a success reply (or disconnect | |
42ea6f5e | 2783 | * message if there was an error). |
aa3378df | 2784 | */ |
42ea6f5e | 2785 | int |
1d1ffb87 | 2786 | channel_input_port_forward_request(int is_root, int gateway_ports) |
8efc0c15 | 2787 | { |
57112b5a | 2788 | u_short port, host_port; |
42ea6f5e | 2789 | int success = 0; |
5260325f | 2790 | char *hostname; |
2791 | ||
2792 | /* Get arguments from the packet. */ | |
2793 | port = packet_get_int(); | |
2794 | hostname = packet_get_string(NULL); | |
2795 | host_port = packet_get_int(); | |
2796 | ||
3c62e7eb | 2797 | #ifndef HAVE_CYGWIN |
aa3378df | 2798 | /* |
2799 | * Check that an unprivileged user is not trying to forward a | |
2800 | * privileged port. | |
2801 | */ | |
5260325f | 2802 | if (port < IPPORT_RESERVED && !is_root) |
8e7c9afc | 2803 | packet_disconnect( |
2804 | "Requested forwarding of port %d but user is not root.", | |
2805 | port); | |
2806 | if (host_port == 0) | |
2807 | packet_disconnect("Dynamic forwarding denied."); | |
3c62e7eb | 2808 | #endif |
8e7c9afc | 2809 | |
fa08c86b | 2810 | /* Initiate forwarding */ |
42ea6f5e | 2811 | success = channel_setup_local_fwd_listener(NULL, port, hostname, |
3867aa0a | 2812 | host_port, gateway_ports); |
5260325f | 2813 | |
2814 | /* Free the argument string. */ | |
2815 | xfree(hostname); | |
42ea6f5e | 2816 | |
2817 | return (success ? 0 : -1); | |
8efc0c15 | 2818 | } |
2819 | ||
01794848 | 2820 | /* |
2821 | * Permits opening to any host/port if permitted_opens[] is empty. This is | |
2822 | * usually called by the server, because the user could connect to any port | |
2823 | * anyway, and the server has no way to know but to trust the client anyway. | |
2824 | */ | |
2825 | void | |
d5bb9418 | 2826 | channel_permit_all_opens(void) |
01794848 | 2827 | { |
2828 | if (num_permitted_opens == 0) | |
2829 | all_opens_permitted = 1; | |
2830 | } | |
2831 | ||
cd332296 | 2832 | void |
01794848 | 2833 | channel_add_permitted_opens(char *host, int port) |
2834 | { | |
2835 | if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
42ea6f5e | 2836 | fatal("channel_add_permitted_opens: too many forwards"); |
01794848 | 2837 | debug("allow port forwarding to host %s port %d", host, port); |
2838 | ||
2839 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host); | |
2840 | permitted_opens[num_permitted_opens].port_to_connect = port; | |
2841 | num_permitted_opens++; | |
2842 | ||
2843 | all_opens_permitted = 0; | |
2844 | } | |
2845 | ||
ea46e550 | 2846 | int |
2fefbadf | 2847 | channel_add_adm_permitted_opens(char *host, int port) |
2848 | { | |
2849 | if (num_adm_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
2850 | fatal("channel_add_adm_permitted_opens: too many forwards"); | |
ea46e550 | 2851 | debug("config allows port forwarding to host %s port %d", host, port); |
2fefbadf | 2852 | |
2853 | permitted_adm_opens[num_adm_permitted_opens].host_to_connect | |
2854 | = xstrdup(host); | |
2855 | permitted_adm_opens[num_adm_permitted_opens].port_to_connect = port; | |
ea46e550 | 2856 | return ++num_adm_permitted_opens; |
2fefbadf | 2857 | } |
2858 | ||
cd332296 | 2859 | void |
01794848 | 2860 | channel_clear_permitted_opens(void) |
2861 | { | |
2862 | int i; | |
2863 | ||
2864 | for (i = 0; i < num_permitted_opens; i++) | |
d740ec16 | 2865 | if (permitted_opens[i].host_to_connect != NULL) |
2866 | xfree(permitted_opens[i].host_to_connect); | |
01794848 | 2867 | num_permitted_opens = 0; |
2fefbadf | 2868 | } |
2869 | ||
2870 | void | |
2871 | channel_clear_adm_permitted_opens(void) | |
2872 | { | |
2873 | int i; | |
01794848 | 2874 | |
2fefbadf | 2875 | for (i = 0; i < num_adm_permitted_opens; i++) |
2876 | if (permitted_adm_opens[i].host_to_connect != NULL) | |
2877 | xfree(permitted_adm_opens[i].host_to_connect); | |
2878 | num_adm_permitted_opens = 0; | |
01794848 | 2879 | } |
2880 | ||
1760c982 | 2881 | void |
2882 | channel_print_adm_permitted_opens(void) | |
2883 | { | |
cdfbc829 | 2884 | int i; |
1760c982 | 2885 | |
68405671 | 2886 | printf("permitopen"); |
861e9e53 | 2887 | if (num_adm_permitted_opens == 0) { |
68405671 | 2888 | printf(" any\n"); |
861e9e53 | 2889 | return; |
2890 | } | |
1760c982 | 2891 | for (i = 0; i < num_adm_permitted_opens; i++) |
2892 | if (permitted_adm_opens[i].host_to_connect != NULL) | |
2893 | printf(" %s:%d", permitted_adm_opens[i].host_to_connect, | |
2894 | permitted_adm_opens[i].port_to_connect); | |
68405671 | 2895 | printf("\n"); |
1760c982 | 2896 | } |
2897 | ||
e07e21ad | 2898 | /* Try to start non-blocking connect to next host in cctx list */ |
396c147e | 2899 | static int |
e07e21ad | 2900 | connect_next(struct channel_connect *cctx) |
8efc0c15 | 2901 | { |
e07e21ad | 2902 | int sock, saved_errno; |
48e671d5 | 2903 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
48e671d5 | 2904 | |
e07e21ad | 2905 | for (; cctx->ai; cctx->ai = cctx->ai->ai_next) { |
2906 | if (cctx->ai->ai_family != AF_INET && | |
2907 | cctx->ai->ai_family != AF_INET6) | |
48e671d5 | 2908 | continue; |
e07e21ad | 2909 | if (getnameinfo(cctx->ai->ai_addr, cctx->ai->ai_addrlen, |
2910 | ntop, sizeof(ntop), strport, sizeof(strport), | |
2911 | NI_NUMERICHOST|NI_NUMERICSERV) != 0) { | |
2912 | error("connect_next: getnameinfo failed"); | |
48e671d5 | 2913 | continue; |
5260325f | 2914 | } |
16d64584 | 2915 | if ((sock = socket(cctx->ai->ai_family, cctx->ai->ai_socktype, |
2916 | cctx->ai->ai_protocol)) == -1) { | |
e07e21ad | 2917 | if (cctx->ai->ai_next == NULL) |
4940c411 | 2918 | error("socket: %.100s", strerror(errno)); |
2919 | else | |
2920 | verbose("socket: %.100s", strerror(errno)); | |
48e671d5 | 2921 | continue; |
5260325f | 2922 | } |
170694d7 | 2923 | if (set_nonblock(sock) == -1) |
2924 | fatal("%s: set_nonblock(%d)", __func__, sock); | |
e07e21ad | 2925 | if (connect(sock, cctx->ai->ai_addr, |
2926 | cctx->ai->ai_addrlen) == -1 && errno != EINPROGRESS) { | |
2927 | debug("connect_next: host %.100s ([%.100s]:%s): " | |
2928 | "%.100s", cctx->host, ntop, strport, | |
48e671d5 | 2929 | strerror(errno)); |
e07e21ad | 2930 | saved_errno = errno; |
48e671d5 | 2931 | close(sock); |
e07e21ad | 2932 | errno = saved_errno; |
2b87da3b | 2933 | continue; /* fail -- try next */ |
48e671d5 | 2934 | } |
e07e21ad | 2935 | debug("connect_next: host %.100s ([%.100s]:%s) " |
2936 | "in progress, fd=%d", cctx->host, ntop, strport, sock); | |
2937 | cctx->ai = cctx->ai->ai_next; | |
2938 | set_nodelay(sock); | |
2939 | return sock; | |
2940 | } | |
2941 | return -1; | |
2942 | } | |
2943 | ||
2944 | static void | |
2945 | channel_connect_ctx_free(struct channel_connect *cctx) | |
2946 | { | |
2947 | xfree(cctx->host); | |
2948 | if (cctx->aitop) | |
2949 | freeaddrinfo(cctx->aitop); | |
2950 | bzero(cctx, sizeof(*cctx)); | |
2951 | cctx->host = NULL; | |
2952 | cctx->ai = cctx->aitop = NULL; | |
2953 | } | |
2954 | ||
2955 | /* Return CONNECTING channel to remote host, port */ | |
2956 | static Channel * | |
2957 | connect_to(const char *host, u_short port, char *ctype, char *rname) | |
2958 | { | |
2959 | struct addrinfo hints; | |
2960 | int gaierr; | |
2961 | int sock = -1; | |
2962 | char strport[NI_MAXSERV]; | |
2963 | struct channel_connect cctx; | |
2964 | Channel *c; | |
5260325f | 2965 | |
267d5589 | 2966 | memset(&cctx, 0, sizeof(cctx)); |
e07e21ad | 2967 | memset(&hints, 0, sizeof(hints)); |
2968 | hints.ai_family = IPv4or6; | |
2969 | hints.ai_socktype = SOCK_STREAM; | |
2970 | snprintf(strport, sizeof strport, "%d", port); | |
2971 | if ((gaierr = getaddrinfo(host, strport, &hints, &cctx.aitop)) != 0) { | |
2972 | error("connect_to %.100s: unknown host (%s)", host, | |
2973 | ssh_gai_strerror(gaierr)); | |
2974 | return NULL; | |
5260325f | 2975 | } |
e07e21ad | 2976 | |
2977 | cctx.host = xstrdup(host); | |
2978 | cctx.port = port; | |
2979 | cctx.ai = cctx.aitop; | |
2980 | ||
2981 | if ((sock = connect_next(&cctx)) == -1) { | |
2982 | error("connect to %.100s port %d failed: %s", | |
2983 | host, port, strerror(errno)); | |
2984 | channel_connect_ctx_free(&cctx); | |
2985 | return NULL; | |
8efc0c15 | 2986 | } |
e07e21ad | 2987 | c = channel_new(ctype, SSH_CHANNEL_CONNECTING, sock, sock, -1, |
2988 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, rname, 1); | |
2989 | c->connect_ctx = cctx; | |
2990 | return c; | |
7368a6c8 | 2991 | } |
01794848 | 2992 | |
e07e21ad | 2993 | Channel * |
2994 | channel_connect_by_listen_address(u_short listen_port, char *ctype, char *rname) | |
fa08c86b | 2995 | { |
2996 | int i; | |
01794848 | 2997 | |
e07e21ad | 2998 | for (i = 0; i < num_permitted_opens; i++) { |
d740ec16 | 2999 | if (permitted_opens[i].host_to_connect != NULL && |
e07e21ad | 3000 | permitted_opens[i].listen_port == listen_port) { |
01794848 | 3001 | return connect_to( |
fa08c86b | 3002 | permitted_opens[i].host_to_connect, |
e07e21ad | 3003 | permitted_opens[i].port_to_connect, ctype, rname); |
3004 | } | |
3005 | } | |
0b6fbf03 | 3006 | error("WARNING: Server requests forwarding for unknown listen_port %d", |
3007 | listen_port); | |
e07e21ad | 3008 | return NULL; |
fa08c86b | 3009 | } |
48e671d5 | 3010 | |
01794848 | 3011 | /* Check if connecting to that port is permitted and connect. */ |
e07e21ad | 3012 | Channel * |
3013 | channel_connect_to(const char *host, u_short port, char *ctype, char *rname) | |
01794848 | 3014 | { |
2fefbadf | 3015 | int i, permit, permit_adm = 1; |
01794848 | 3016 | |
3017 | permit = all_opens_permitted; | |
3018 | if (!permit) { | |
3019 | for (i = 0; i < num_permitted_opens; i++) | |
d740ec16 | 3020 | if (permitted_opens[i].host_to_connect != NULL && |
3021 | permitted_opens[i].port_to_connect == port && | |
01794848 | 3022 | strcmp(permitted_opens[i].host_to_connect, host) == 0) |
3023 | permit = 1; | |
2fefbadf | 3024 | } |
01794848 | 3025 | |
2fefbadf | 3026 | if (num_adm_permitted_opens > 0) { |
3027 | permit_adm = 0; | |
3028 | for (i = 0; i < num_adm_permitted_opens; i++) | |
3029 | if (permitted_adm_opens[i].host_to_connect != NULL && | |
3030 | permitted_adm_opens[i].port_to_connect == port && | |
3031 | strcmp(permitted_adm_opens[i].host_to_connect, host) | |
3032 | == 0) | |
3033 | permit_adm = 1; | |
01794848 | 3034 | } |
2fefbadf | 3035 | |
3036 | if (!permit || !permit_adm) { | |
bbe88b6d | 3037 | logit("Received request to connect to host %.100s port %d, " |
01794848 | 3038 | "but the request was denied.", host, port); |
e07e21ad | 3039 | return NULL; |
01794848 | 3040 | } |
e07e21ad | 3041 | return connect_to(host, port, ctype, rname); |
01794848 | 3042 | } |
3043 | ||
5e96b616 | 3044 | void |
3045 | channel_send_window_changes(void) | |
3046 | { | |
9a995072 | 3047 | u_int i; |
5e96b616 | 3048 | struct winsize ws; |
3049 | ||
3050 | for (i = 0; i < channels_alloc; i++) { | |
f8cc7664 | 3051 | if (channels[i] == NULL || !channels[i]->client_tty || |
5e96b616 | 3052 | channels[i]->type != SSH_CHANNEL_OPEN) |
3053 | continue; | |
3054 | if (ioctl(channels[i]->rfd, TIOCGWINSZ, &ws) < 0) | |
3055 | continue; | |
3056 | channel_request_start(i, "window-change", 0); | |
148de80c | 3057 | packet_put_int((u_int)ws.ws_col); |
3058 | packet_put_int((u_int)ws.ws_row); | |
3059 | packet_put_int((u_int)ws.ws_xpixel); | |
3060 | packet_put_int((u_int)ws.ws_ypixel); | |
5e96b616 | 3061 | packet_send(); |
3062 | } | |
3063 | } | |
3064 | ||
8e7895b8 | 3065 | /* -- X11 forwarding */ |
8efc0c15 | 3066 | |
aa3378df | 3067 | /* |
3068 | * Creates an internet domain socket for listening for X11 connections. | |
57f228e8 | 3069 | * Returns 0 and a suitable display number for the DISPLAY variable |
3070 | * stored in display_numberp , or -1 if an error occurs. | |
aa3378df | 3071 | */ |
c9d0ad9b | 3072 | int |
e6e573bd | 3073 | x11_create_display_inet(int x11_display_offset, int x11_use_localhost, |
d08341e6 | 3074 | int single_connection, u_int *display_numberp, int **chanids) |
8efc0c15 | 3075 | { |
ac151b18 | 3076 | Channel *nc = NULL; |
57112b5a | 3077 | int display_number, sock; |
3078 | u_short port; | |
48e671d5 | 3079 | struct addrinfo hints, *ai, *aitop; |
3080 | char strport[NI_MAXSERV]; | |
3081 | int gaierr, n, num_socks = 0, socks[NUM_SOCKS]; | |
5260325f | 3082 | |
59e5aff5 | 3083 | if (chanids == NULL) |
3084 | return -1; | |
3085 | ||
95f1eccc | 3086 | for (display_number = x11_display_offset; |
184eed6a | 3087 | display_number < MAX_DISPLAYS; |
3088 | display_number++) { | |
5260325f | 3089 | port = 6000 + display_number; |
48e671d5 | 3090 | memset(&hints, 0, sizeof(hints)); |
3091 | hints.ai_family = IPv4or6; | |
e6e573bd | 3092 | hints.ai_flags = x11_use_localhost ? 0: AI_PASSIVE; |
48e671d5 | 3093 | hints.ai_socktype = SOCK_STREAM; |
3094 | snprintf(strport, sizeof strport, "%d", port); | |
3095 | if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) { | |
bb4626fe | 3096 | error("getaddrinfo: %.100s", ssh_gai_strerror(gaierr)); |
c9d0ad9b | 3097 | return -1; |
5260325f | 3098 | } |
48e671d5 | 3099 | for (ai = aitop; ai; ai = ai->ai_next) { |
3100 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
3101 | continue; | |
16d64584 | 3102 | sock = socket(ai->ai_family, ai->ai_socktype, |
3103 | ai->ai_protocol); | |
48e671d5 | 3104 | if (sock < 0) { |
4ee81249 | 3105 | if ((errno != EINVAL) && (errno != EAFNOSUPPORT)) { |
80a44451 | 3106 | error("socket: %.100s", strerror(errno)); |
0ea89f7e | 3107 | freeaddrinfo(aitop); |
c9d0ad9b | 3108 | return -1; |
80a44451 | 3109 | } else { |
22d89d24 | 3110 | debug("x11_create_display_inet: Socket family %d not supported", |
3111 | ai->ai_family); | |
80a44451 | 3112 | continue; |
3113 | } | |
48e671d5 | 3114 | } |
4e1082aa | 3115 | if (ai->ai_family == AF_INET6) |
3116 | sock_set_v6only(sock); | |
554ebbed | 3117 | if (x11_use_localhost) |
3118 | channel_set_reuseaddr(sock); | |
48e671d5 | 3119 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { |
d7ac5f18 | 3120 | debug2("bind port %d: %.100s", port, strerror(errno)); |
48e671d5 | 3121 | close(sock); |
16218745 | 3122 | |
48e671d5 | 3123 | for (n = 0; n < num_socks; n++) { |
48e671d5 | 3124 | close(socks[n]); |
3125 | } | |
3126 | num_socks = 0; | |
3127 | break; | |
3128 | } | |
3129 | socks[num_socks++] = sock; | |
3130 | if (num_socks == NUM_SOCKS) | |
3131 | break; | |
5260325f | 3132 | } |
4ccb01d6 | 3133 | freeaddrinfo(aitop); |
48e671d5 | 3134 | if (num_socks > 0) |
3135 | break; | |
5260325f | 3136 | } |
3137 | if (display_number >= MAX_DISPLAYS) { | |
3138 | error("Failed to allocate internet-domain X11 display socket."); | |
c9d0ad9b | 3139 | return -1; |
8efc0c15 | 3140 | } |
5260325f | 3141 | /* Start listening for connections on the socket. */ |
48e671d5 | 3142 | for (n = 0; n < num_socks; n++) { |
3143 | sock = socks[n]; | |
fce39749 | 3144 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { |
48e671d5 | 3145 | error("listen: %.100s", strerror(errno)); |
48e671d5 | 3146 | close(sock); |
c9d0ad9b | 3147 | return -1; |
a7effaac | 3148 | } |
a7effaac | 3149 | } |
5260325f | 3150 | |
48e671d5 | 3151 | /* Allocate a channel for each socket. */ |
52e3daed | 3152 | *chanids = xcalloc(num_socks + 1, sizeof(**chanids)); |
48e671d5 | 3153 | for (n = 0; n < num_socks; n++) { |
3154 | sock = socks[n]; | |
ac151b18 | 3155 | nc = channel_new("x11 listener", |
0b242b12 | 3156 | SSH_CHANNEL_X11_LISTENER, sock, sock, -1, |
3157 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, | |
0d942eff | 3158 | 0, "X11 inet listener", 1); |
3a0d3d54 | 3159 | nc->single_connection = single_connection; |
59e5aff5 | 3160 | (*chanids)[n] = nc->self; |
48e671d5 | 3161 | } |
59e5aff5 | 3162 | (*chanids)[n] = -1; |
5260325f | 3163 | |
c9d0ad9b | 3164 | /* Return the display number for the DISPLAY environment variable. */ |
57f228e8 | 3165 | *display_numberp = display_number; |
3166 | return (0); | |
8efc0c15 | 3167 | } |
3168 | ||
396c147e | 3169 | static int |
b5a1596f | 3170 | connect_local_xsocket_path(const char *pathname) |
8efc0c15 | 3171 | { |
5260325f | 3172 | int sock; |
3173 | struct sockaddr_un addr; | |
5260325f | 3174 | |
805e659f | 3175 | sock = socket(AF_UNIX, SOCK_STREAM, 0); |
3176 | if (sock < 0) | |
3177 | error("socket: %.100s", strerror(errno)); | |
3178 | memset(&addr, 0, sizeof(addr)); | |
3179 | addr.sun_family = AF_UNIX; | |
b5a1596f | 3180 | strlcpy(addr.sun_path, pathname, sizeof addr.sun_path); |
32596c7b | 3181 | if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) == 0) |
805e659f | 3182 | return sock; |
3183 | close(sock); | |
5260325f | 3184 | error("connect %.100s: %.100s", addr.sun_path, strerror(errno)); |
3185 | return -1; | |
8efc0c15 | 3186 | } |
3187 | ||
b5a1596f | 3188 | static int |
3189 | connect_local_xsocket(u_int dnr) | |
3190 | { | |
3191 | char buf[1024]; | |
3192 | snprintf(buf, sizeof buf, _PATH_UNIX_X, dnr); | |
3193 | return connect_local_xsocket_path(buf); | |
3194 | } | |
3195 | ||
0b242b12 | 3196 | int |
3197 | x11_connect_display(void) | |
8efc0c15 | 3198 | { |
4f16046f | 3199 | u_int display_number; |
5260325f | 3200 | const char *display; |
0b242b12 | 3201 | char buf[1024], *cp; |
48e671d5 | 3202 | struct addrinfo hints, *ai, *aitop; |
3203 | char strport[NI_MAXSERV]; | |
4f16046f | 3204 | int gaierr, sock = 0; |
5260325f | 3205 | |
5260325f | 3206 | /* Try to open a socket for the local X server. */ |
3207 | display = getenv("DISPLAY"); | |
3208 | if (!display) { | |
3209 | error("DISPLAY not set."); | |
0b242b12 | 3210 | return -1; |
5260325f | 3211 | } |
aa3378df | 3212 | /* |
3213 | * Now we decode the value of the DISPLAY variable and make a | |
3214 | * connection to the real X server. | |
3215 | */ | |
3216 | ||
b5a1596f | 3217 | /* Check if the display is from launchd. */ |
3218 | #ifdef __APPLE__ | |
3219 | if (strncmp(display, "/tmp/launch", 11) == 0) { | |
3220 | sock = connect_local_xsocket_path(display); | |
3221 | if (sock < 0) | |
3222 | return -1; | |
3223 | ||
3224 | /* OK, we now have a connection to the display. */ | |
3225 | return sock; | |
3226 | } | |
3227 | #endif | |
aa3378df | 3228 | /* |
3229 | * Check if it is a unix domain socket. Unix domain displays are in | |
3230 | * one of the following formats: unix:d[.s], :d[.s], ::d[.s] | |
3231 | */ | |
5260325f | 3232 | if (strncmp(display, "unix:", 5) == 0 || |
3233 | display[0] == ':') { | |
3234 | /* Connect to the unix domain socket. */ | |
4f16046f | 3235 | if (sscanf(strrchr(display, ':') + 1, "%u", &display_number) != 1) { |
5260325f | 3236 | error("Could not parse display number from DISPLAY: %.100s", |
184eed6a | 3237 | display); |
0b242b12 | 3238 | return -1; |
5260325f | 3239 | } |
3240 | /* Create a socket. */ | |
3241 | sock = connect_local_xsocket(display_number); | |
3242 | if (sock < 0) | |
0b242b12 | 3243 | return -1; |
5260325f | 3244 | |
3245 | /* OK, we now have a connection to the display. */ | |
0b242b12 | 3246 | return sock; |
5260325f | 3247 | } |
aa3378df | 3248 | /* |
3249 | * Connect to an inet socket. The DISPLAY value is supposedly | |
3250 | * hostname:d[.s], where hostname may also be numeric IP address. | |
3251 | */ | |
74860245 | 3252 | strlcpy(buf, display, sizeof(buf)); |
5260325f | 3253 | cp = strchr(buf, ':'); |
3254 | if (!cp) { | |
3255 | error("Could not find ':' in DISPLAY: %.100s", display); | |
0b242b12 | 3256 | return -1; |
5260325f | 3257 | } |
3258 | *cp = 0; | |
aa3378df | 3259 | /* buf now contains the host name. But first we parse the display number. */ |
4f16046f | 3260 | if (sscanf(cp + 1, "%u", &display_number) != 1) { |
5260325f | 3261 | error("Could not parse display number from DISPLAY: %.100s", |
184eed6a | 3262 | display); |
0b242b12 | 3263 | return -1; |
5260325f | 3264 | } |
5260325f | 3265 | |
48e671d5 | 3266 | /* Look up the host address */ |
3267 | memset(&hints, 0, sizeof(hints)); | |
3268 | hints.ai_family = IPv4or6; | |
3269 | hints.ai_socktype = SOCK_STREAM; | |
4f16046f | 3270 | snprintf(strport, sizeof strport, "%u", 6000 + display_number); |
48e671d5 | 3271 | if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) { |
bb4626fe | 3272 | error("%.100s: unknown host. (%s)", buf, |
3273 | ssh_gai_strerror(gaierr)); | |
0b242b12 | 3274 | return -1; |
8efc0c15 | 3275 | } |
48e671d5 | 3276 | for (ai = aitop; ai; ai = ai->ai_next) { |
3277 | /* Create a socket. */ | |
16d64584 | 3278 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
48e671d5 | 3279 | if (sock < 0) { |
d7ac5f18 | 3280 | debug2("socket: %.100s", strerror(errno)); |
7368a6c8 | 3281 | continue; |
3282 | } | |
3283 | /* Connect it to the display. */ | |
3284 | if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) { | |
4f16046f | 3285 | debug2("connect %.100s port %u: %.100s", buf, |
7368a6c8 | 3286 | 6000 + display_number, strerror(errno)); |
3287 | close(sock); | |
3288 | continue; | |
3289 | } | |
3290 | /* Success */ | |
3291 | break; | |
48e671d5 | 3292 | } |
48e671d5 | 3293 | freeaddrinfo(aitop); |
3294 | if (!ai) { | |
4f16046f | 3295 | error("connect %.100s port %u: %.100s", buf, 6000 + display_number, |
48e671d5 | 3296 | strerror(errno)); |
0b242b12 | 3297 | return -1; |
8efc0c15 | 3298 | } |
bcc0381e | 3299 | set_nodelay(sock); |
0b242b12 | 3300 | return sock; |
3301 | } | |
5260325f | 3302 | |
0b242b12 | 3303 | /* |
3304 | * This is called when SSH_SMSG_X11_OPEN is received. The packet contains | |
3305 | * the remote channel number. We should do whatever we want, and respond | |
3306 | * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE. | |
3307 | */ | |
5260325f | 3308 | |
ebb90778 | 3309 | /* ARGSUSED */ |
0b242b12 | 3310 | void |
7819b5c3 | 3311 | x11_input_open(int type, u_int32_t seq, void *ctxt) |
0b242b12 | 3312 | { |
719fc62f | 3313 | Channel *c = NULL; |
3314 | int remote_id, sock = 0; | |
0b242b12 | 3315 | char *remote_host; |
5260325f | 3316 | |
719fc62f | 3317 | debug("Received X11 open request."); |
5260325f | 3318 | |
719fc62f | 3319 | remote_id = packet_get_int(); |
8e7895b8 | 3320 | |
3321 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) { | |
719fc62f | 3322 | remote_host = packet_get_string(NULL); |
0b242b12 | 3323 | } else { |
3324 | remote_host = xstrdup("unknown (remote did not supply name)"); | |
0b242b12 | 3325 | } |
95500969 | 3326 | packet_check_eom(); |
0b242b12 | 3327 | |
3328 | /* Obtain a connection to the real X display. */ | |
3329 | sock = x11_connect_display(); | |
719fc62f | 3330 | if (sock != -1) { |
3331 | /* Allocate a channel for this connection. */ | |
3332 | c = channel_new("connected x11 socket", | |
3333 | SSH_CHANNEL_X11_OPEN, sock, sock, -1, 0, 0, 0, | |
3334 | remote_host, 1); | |
3a0d3d54 | 3335 | c->remote_id = remote_id; |
3336 | c->force_drain = 1; | |
719fc62f | 3337 | } |
0d942eff | 3338 | xfree(remote_host); |
719fc62f | 3339 | if (c == NULL) { |
0b242b12 | 3340 | /* Send refusal to the remote host. */ |
3341 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
719fc62f | 3342 | packet_put_int(remote_id); |
0b242b12 | 3343 | } else { |
0b242b12 | 3344 | /* Send a confirmation to the remote host. */ |
3345 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
719fc62f | 3346 | packet_put_int(remote_id); |
3347 | packet_put_int(c->self); | |
0b242b12 | 3348 | } |
719fc62f | 3349 | packet_send(); |
8efc0c15 | 3350 | } |
3351 | ||
a22aff1f | 3352 | /* dummy protocol handler that denies SSH-1 requests (agent/x11) */ |
ebb90778 | 3353 | /* ARGSUSED */ |
a22aff1f | 3354 | void |
7819b5c3 | 3355 | deny_input_open(int type, u_int32_t seq, void *ctxt) |
a22aff1f | 3356 | { |
3357 | int rchan = packet_get_int(); | |
e1feb9bf | 3358 | |
6aacefa7 | 3359 | switch (type) { |
a22aff1f | 3360 | case SSH_SMSG_AGENT_OPEN: |
3361 | error("Warning: ssh server tried agent forwarding."); | |
3362 | break; | |
3363 | case SSH_SMSG_X11_OPEN: | |
3364 | error("Warning: ssh server tried X11 forwarding."); | |
3365 | break; | |
3366 | default: | |
7819b5c3 | 3367 | error("deny_input_open: type %d", type); |
a22aff1f | 3368 | break; |
3369 | } | |
1908529f | 3370 | error("Warning: this is probably a break-in attempt by a malicious server."); |
a22aff1f | 3371 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
3372 | packet_put_int(rchan); | |
3373 | packet_send(); | |
3374 | } | |
3375 | ||
aa3378df | 3376 | /* |
3377 | * Requests forwarding of X11 connections, generates fake authentication | |
3378 | * data, and enables authentication spoofing. | |
8e7895b8 | 3379 | * This should be called in the client only. |
aa3378df | 3380 | */ |
6ae2364d | 3381 | void |
9bf083eb | 3382 | x11_request_forwarding_with_spoofing(int client_session_id, const char *disp, |
0b242b12 | 3383 | const char *proto, const char *data) |
8efc0c15 | 3384 | { |
1e3b8b07 | 3385 | u_int data_len = (u_int) strlen(data) / 2; |
ef07103c | 3386 | u_int i, value; |
5260325f | 3387 | char *new_data; |
3388 | int screen_number; | |
3389 | const char *cp; | |
ca75d7de | 3390 | u_int32_t rnd = 0; |
5260325f | 3391 | |
4297b666 | 3392 | if (x11_saved_display == NULL) |
3393 | x11_saved_display = xstrdup(disp); | |
3394 | else if (strcmp(disp, x11_saved_display) != 0) { | |
ef07103c | 3395 | error("x11_request_forwarding_with_spoofing: different " |
3396 | "$DISPLAY already forwarded"); | |
3397 | return; | |
3398 | } | |
3399 | ||
0875ae22 | 3400 | cp = strchr(disp, ':'); |
5260325f | 3401 | if (cp) |
3402 | cp = strchr(cp, '.'); | |
3403 | if (cp) | |
d6d4897e | 3404 | screen_number = (u_int)strtonum(cp + 1, 0, 400, NULL); |
5260325f | 3405 | else |
3406 | screen_number = 0; | |
3407 | ||
ef07103c | 3408 | if (x11_saved_proto == NULL) { |
3409 | /* Save protocol name. */ | |
3410 | x11_saved_proto = xstrdup(proto); | |
3411 | /* | |
56964485 | 3412 | * Extract real authentication data and generate fake data |
ef07103c | 3413 | * of the same length. |
3414 | */ | |
3415 | x11_saved_data = xmalloc(data_len); | |
3416 | x11_fake_data = xmalloc(data_len); | |
3417 | for (i = 0; i < data_len; i++) { | |
3418 | if (sscanf(data + 2 * i, "%2x", &value) != 1) | |
3419 | fatal("x11_request_forwarding: bad " | |
3420 | "authentication data: %.100s", data); | |
3421 | if (i % 4 == 0) | |
3422 | rnd = arc4random(); | |
3423 | x11_saved_data[i] = value; | |
3424 | x11_fake_data[i] = rnd & 0xff; | |
3425 | rnd >>= 8; | |
3426 | } | |
3427 | x11_saved_data_len = data_len; | |
3428 | x11_fake_data_len = data_len; | |
3429 | } | |
5260325f | 3430 | |
3431 | /* Convert the fake data into hex. */ | |
ef07103c | 3432 | new_data = tohex(x11_fake_data, data_len); |
5260325f | 3433 | |
3434 | /* Send the request packet. */ | |
0b242b12 | 3435 | if (compat20) { |
3436 | channel_request_start(client_session_id, "x11-req", 0); | |
3437 | packet_put_char(0); /* XXX bool single connection */ | |
3438 | } else { | |
3439 | packet_start(SSH_CMSG_X11_REQUEST_FORWARDING); | |
3440 | } | |
3441 | packet_put_cstring(proto); | |
3442 | packet_put_cstring(new_data); | |
5260325f | 3443 | packet_put_int(screen_number); |
3444 | packet_send(); | |
3445 | packet_write_wait(); | |
3446 | xfree(new_data); | |
8efc0c15 | 3447 | } |
3448 | ||
8e7895b8 | 3449 | |
3450 | /* -- agent forwarding */ | |
3451 | ||
8efc0c15 | 3452 | /* Sends a message to the server to request authentication fd forwarding. */ |
3453 | ||
6ae2364d | 3454 | void |
d5bb9418 | 3455 | auth_request_forwarding(void) |
8efc0c15 | 3456 | { |
5260325f | 3457 | packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING); |
3458 | packet_send(); | |
3459 | packet_write_wait(); | |
8efc0c15 | 3460 | } |