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b3784859 | 1 | /* $OpenBSD: channels.c,v 1.282 2008/06/16 13:22:53 dtucker Exp $ */ |
8efc0c15 | 2 | /* |
5260325f | 3 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
5260325f | 4 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
5 | * All rights reserved | |
5260325f | 6 | * This file contains functions for generic socket connection forwarding. |
7 | * There is also code for initiating connection forwarding for X11 connections, | |
8 | * arbitrary tcp/ip connections, and the authentication agent connection. | |
6ae2364d | 9 | * |
bcbf86ec | 10 | * As far as I am concerned, the code I have written for this software |
11 | * can be used freely for any purpose. Any derived versions of this | |
12 | * software must be clearly marked as such, and if the derived work is | |
13 | * incompatible with the protocol description in the RFC file, it must be | |
14 | * called by a name other than "ssh" or "Secure Shell". | |
15 | * | |
7e7327a1 | 16 | * SSH2 support added by Markus Friedl. |
8341f420 | 17 | * Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved. |
bcbf86ec | 18 | * Copyright (c) 1999 Dug Song. All rights reserved. |
19 | * Copyright (c) 1999 Theo de Raadt. All rights reserved. | |
20 | * | |
21 | * Redistribution and use in source and binary forms, with or without | |
22 | * modification, are permitted provided that the following conditions | |
23 | * are met: | |
24 | * 1. Redistributions of source code must retain the above copyright | |
25 | * notice, this list of conditions and the following disclaimer. | |
26 | * 2. Redistributions in binary form must reproduce the above copyright | |
27 | * notice, this list of conditions and the following disclaimer in the | |
28 | * documentation and/or other materials provided with the distribution. | |
29 | * | |
30 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
31 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
32 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
33 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
34 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
35 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
36 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
37 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
38 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
39 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
5260325f | 40 | */ |
8efc0c15 | 41 | |
42 | #include "includes.h" | |
bd7c69ea | 43 | |
cebb4c24 | 44 | #include <sys/types.h> |
31652869 | 45 | #include <sys/ioctl.h> |
cebb4c24 | 46 | #include <sys/un.h> |
319d6b41 | 47 | #include <sys/socket.h> |
e264ac72 | 48 | #ifdef HAVE_SYS_TIME_H |
49 | # include <sys/time.h> | |
50 | #endif | |
319d6b41 | 51 | |
52 | #include <netinet/in.h> | |
53 | #include <arpa/inet.h> | |
1d3e026f | 54 | |
028094f4 | 55 | #include <errno.h> |
28cb0a43 | 56 | #include <netdb.h> |
cf851879 | 57 | #include <stdio.h> |
ffa517a8 | 58 | #include <stdlib.h> |
00146caa | 59 | #include <string.h> |
1d3e026f | 60 | #include <termios.h> |
5188ba17 | 61 | #include <unistd.h> |
31652869 | 62 | #include <stdarg.h> |
8efc0c15 | 63 | |
3593bdc0 | 64 | #include "openbsd-compat/sys-queue.h" |
31652869 | 65 | #include "xmalloc.h" |
8efc0c15 | 66 | #include "ssh.h" |
42f11eb2 | 67 | #include "ssh1.h" |
68 | #include "ssh2.h" | |
8efc0c15 | 69 | #include "packet.h" |
42f11eb2 | 70 | #include "log.h" |
71 | #include "misc.h" | |
31652869 | 72 | #include "buffer.h" |
8efc0c15 | 73 | #include "channels.h" |
8efc0c15 | 74 | #include "compat.h" |
42f11eb2 | 75 | #include "canohost.h" |
4c8722d9 | 76 | #include "key.h" |
77 | #include "authfd.h" | |
805e659f | 78 | #include "pathnames.h" |
8efc0c15 | 79 | |
8e7895b8 | 80 | /* -- channel core */ |
8efc0c15 | 81 | |
aa3378df | 82 | /* |
83 | * Pointer to an array containing all allocated channels. The array is | |
84 | * dynamically extended as needed. | |
85 | */ | |
719fc62f | 86 | static Channel **channels = NULL; |
8efc0c15 | 87 | |
aa3378df | 88 | /* |
89 | * Size of the channel array. All slots of the array must always be | |
719fc62f | 90 | * initialized (at least the type field); unused slots set to NULL |
aa3378df | 91 | */ |
9a995072 | 92 | static u_int channels_alloc = 0; |
8efc0c15 | 93 | |
aa3378df | 94 | /* |
95 | * Maximum file descriptor value used in any of the channels. This is | |
719fc62f | 96 | * updated in channel_new. |
aa3378df | 97 | */ |
39929cdb | 98 | static int channel_max_fd = 0; |
8efc0c15 | 99 | |
8efc0c15 | 100 | |
8e7895b8 | 101 | /* -- tcp forwarding */ |
8efc0c15 | 102 | |
aa3378df | 103 | /* |
104 | * Data structure for storing which hosts are permitted for forward requests. | |
105 | * The local sides of any remote forwards are stored in this array to prevent | |
106 | * a corrupt remote server from accessing arbitrary TCP/IP ports on our local | |
107 | * network (which might be behind a firewall). | |
108 | */ | |
5260325f | 109 | typedef struct { |
7368a6c8 | 110 | char *host_to_connect; /* Connect to 'host'. */ |
111 | u_short port_to_connect; /* Connect to 'port'. */ | |
112 | u_short listen_port; /* Remote side should listen port number. */ | |
8efc0c15 | 113 | } ForwardPermission; |
114 | ||
2fefbadf | 115 | /* List of all permitted host/port pairs to connect by the user. */ |
8efc0c15 | 116 | static ForwardPermission permitted_opens[SSH_MAX_FORWARDS_PER_DIRECTION]; |
8e7895b8 | 117 | |
2fefbadf | 118 | /* List of all permitted host/port pairs to connect by the admin. */ |
119 | static ForwardPermission permitted_adm_opens[SSH_MAX_FORWARDS_PER_DIRECTION]; | |
120 | ||
121 | /* Number of permitted host/port pairs in the array permitted by the user. */ | |
8efc0c15 | 122 | static int num_permitted_opens = 0; |
2fefbadf | 123 | |
124 | /* Number of permitted host/port pair in the array permitted by the admin. */ | |
125 | static int num_adm_permitted_opens = 0; | |
126 | ||
aa3378df | 127 | /* |
128 | * If this is true, all opens are permitted. This is the case on the server | |
129 | * on which we have to trust the client anyway, and the user could do | |
130 | * anything after logging in anyway. | |
131 | */ | |
8efc0c15 | 132 | static int all_opens_permitted = 0; |
133 | ||
8efc0c15 | 134 | |
8e7895b8 | 135 | /* -- X11 forwarding */ |
42f11eb2 | 136 | |
8e7895b8 | 137 | /* Maximum number of fake X11 displays to try. */ |
138 | #define MAX_DISPLAYS 1000 | |
0490e609 | 139 | |
ef07103c | 140 | /* Saved X11 local (client) display. */ |
141 | static char *x11_saved_display = NULL; | |
142 | ||
8e7895b8 | 143 | /* Saved X11 authentication protocol name. */ |
144 | static char *x11_saved_proto = NULL; | |
8efc0c15 | 145 | |
8e7895b8 | 146 | /* Saved X11 authentication data. This is the real data. */ |
147 | static char *x11_saved_data = NULL; | |
148 | static u_int x11_saved_data_len = 0; | |
149 | ||
150 | /* | |
151 | * Fake X11 authentication data. This is what the server will be sending us; | |
152 | * we should replace any occurrences of this by the real data. | |
153 | */ | |
338eb2ab | 154 | static u_char *x11_fake_data = NULL; |
8e7895b8 | 155 | static u_int x11_fake_data_len; |
156 | ||
157 | ||
158 | /* -- agent forwarding */ | |
8efc0c15 | 159 | |
8e7895b8 | 160 | #define NUM_SOCKS 10 |
161 | ||
8e7895b8 | 162 | /* AF_UNSPEC or AF_INET or AF_INET6 */ |
5e4a7219 | 163 | static int IPv4or6 = AF_UNSPEC; |
8e7895b8 | 164 | |
165 | /* helper */ | |
396c147e | 166 | static void port_open_helper(Channel *c, char *rtype); |
8e7895b8 | 167 | |
e07e21ad | 168 | /* non-blocking connect helpers */ |
169 | static int connect_next(struct channel_connect *); | |
170 | static void channel_connect_ctx_free(struct channel_connect *); | |
171 | ||
8e7895b8 | 172 | /* -- channel core */ |
7368a6c8 | 173 | |
174 | Channel * | |
b872f7f0 | 175 | channel_by_id(int id) |
7368a6c8 | 176 | { |
177 | Channel *c; | |
719fc62f | 178 | |
9a995072 | 179 | if (id < 0 || (u_int)id >= channels_alloc) { |
b872f7f0 | 180 | logit("channel_by_id: %d: bad id", id); |
7368a6c8 | 181 | return NULL; |
182 | } | |
719fc62f | 183 | c = channels[id]; |
184 | if (c == NULL) { | |
b872f7f0 | 185 | logit("channel_by_id: %d: bad id: channel free", id); |
7368a6c8 | 186 | return NULL; |
187 | } | |
188 | return c; | |
189 | } | |
190 | ||
b872f7f0 | 191 | /* |
192 | * Returns the channel if it is allowed to receive protocol messages. | |
193 | * Private channels, like listening sockets, may not receive messages. | |
194 | */ | |
195 | Channel * | |
196 | channel_lookup(int id) | |
197 | { | |
198 | Channel *c; | |
199 | ||
200 | if ((c = channel_by_id(id)) == NULL) | |
201 | return (NULL); | |
202 | ||
c8e9c167 | 203 | switch (c->type) { |
b872f7f0 | 204 | case SSH_CHANNEL_X11_OPEN: |
205 | case SSH_CHANNEL_LARVAL: | |
206 | case SSH_CHANNEL_CONNECTING: | |
207 | case SSH_CHANNEL_DYNAMIC: | |
208 | case SSH_CHANNEL_OPENING: | |
209 | case SSH_CHANNEL_OPEN: | |
210 | case SSH_CHANNEL_INPUT_DRAINING: | |
211 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
212 | return (c); | |
b872f7f0 | 213 | } |
214 | logit("Non-public channel %d, type %d.", id, c->type); | |
215 | return (NULL); | |
216 | } | |
217 | ||
aa3378df | 218 | /* |
1d1ffb87 | 219 | * Register filedescriptors for a channel, used when allocating a channel or |
0fbe8c74 | 220 | * when the channel consumer/producer is ready, e.g. shell exec'd |
aa3378df | 221 | */ |
396c147e | 222 | static void |
a22aff1f | 223 | channel_register_fds(Channel *c, int rfd, int wfd, int efd, |
b3784859 | 224 | int extusage, int nonblock, int is_tty) |
8efc0c15 | 225 | { |
5260325f | 226 | /* Update the maximum file descriptor value. */ |
39929cdb | 227 | channel_max_fd = MAX(channel_max_fd, rfd); |
228 | channel_max_fd = MAX(channel_max_fd, wfd); | |
229 | channel_max_fd = MAX(channel_max_fd, efd); | |
230 | ||
aa3378df | 231 | /* XXX set close-on-exec -markus */ |
1d1ffb87 | 232 | |
0fbe8c74 | 233 | c->rfd = rfd; |
234 | c->wfd = wfd; | |
235 | c->sock = (rfd == wfd) ? rfd : -1; | |
5e96b616 | 236 | c->ctl_fd = -1; /* XXX: set elsewhere */ |
0fbe8c74 | 237 | c->efd = efd; |
238 | c->extended_usage = extusage; | |
a22aff1f | 239 | |
b3784859 | 240 | if ((c->isatty = is_tty) != 0) |
d7ac5f18 | 241 | debug2("channel %d: rfd %d isatty", c->self, c->rfd); |
245f4d36 | 242 | c->wfd_isatty = is_tty || isatty(c->wfd); |
0ae4fe1d | 243 | |
a22aff1f | 244 | /* enable nonblocking mode */ |
245 | if (nonblock) { | |
246 | if (rfd != -1) | |
247 | set_nonblock(rfd); | |
248 | if (wfd != -1) | |
249 | set_nonblock(wfd); | |
250 | if (efd != -1) | |
251 | set_nonblock(efd); | |
252 | } | |
0fbe8c74 | 253 | } |
254 | ||
255 | /* | |
256 | * Allocate a new channel object and set its type and socket. This will cause | |
257 | * remote_name to be freed. | |
258 | */ | |
719fc62f | 259 | Channel * |
0fbe8c74 | 260 | channel_new(char *ctype, int type, int rfd, int wfd, int efd, |
f91d9a89 | 261 | u_int window, u_int maxpack, int extusage, char *remote_name, int nonblock) |
0fbe8c74 | 262 | { |
9a995072 | 263 | int found; |
264 | u_int i; | |
0fbe8c74 | 265 | Channel *c; |
5260325f | 266 | |
267 | /* Do initial allocation if this is the first call. */ | |
268 | if (channels_alloc == 0) { | |
269 | channels_alloc = 10; | |
52e3daed | 270 | channels = xcalloc(channels_alloc, sizeof(Channel *)); |
5260325f | 271 | for (i = 0; i < channels_alloc; i++) |
719fc62f | 272 | channels[i] = NULL; |
5260325f | 273 | } |
274 | /* Try to find a free slot where to put the new channel. */ | |
275 | for (found = -1, i = 0; i < channels_alloc; i++) | |
719fc62f | 276 | if (channels[i] == NULL) { |
5260325f | 277 | /* Found a free slot. */ |
9a995072 | 278 | found = (int)i; |
5260325f | 279 | break; |
280 | } | |
9a995072 | 281 | if (found < 0) { |
aa3378df | 282 | /* There are no free slots. Take last+1 slot and expand the array. */ |
5260325f | 283 | found = channels_alloc; |
5df8c731 | 284 | if (channels_alloc > 10000) |
285 | fatal("channel_new: internal error: channels_alloc %d " | |
286 | "too big.", channels_alloc); | |
c5d10563 | 287 | channels = xrealloc(channels, channels_alloc + 10, |
288 | sizeof(Channel *)); | |
20419cc1 | 289 | channels_alloc += 10; |
de273eef | 290 | debug2("channel: expanding %d", channels_alloc); |
5260325f | 291 | for (i = found; i < channels_alloc; i++) |
719fc62f | 292 | channels[i] = NULL; |
5260325f | 293 | } |
719fc62f | 294 | /* Initialize and return new channel. */ |
52e3daed | 295 | c = channels[found] = xcalloc(1, sizeof(Channel)); |
5260325f | 296 | buffer_init(&c->input); |
297 | buffer_init(&c->output); | |
7368a6c8 | 298 | buffer_init(&c->extended); |
70bef40e | 299 | c->ostate = CHAN_OUTPUT_OPEN; |
300 | c->istate = CHAN_INPUT_OPEN; | |
301 | c->flags = 0; | |
c9478090 | 302 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock, 0); |
5260325f | 303 | c->self = found; |
304 | c->type = type; | |
7368a6c8 | 305 | c->ctype = ctype; |
0b242b12 | 306 | c->local_window = window; |
307 | c->local_window_max = window; | |
308 | c->local_consumed = 0; | |
309 | c->local_maxpacket = maxpack; | |
5260325f | 310 | c->remote_id = -1; |
0d942eff | 311 | c->remote_name = xstrdup(remote_name); |
7368a6c8 | 312 | c->remote_window = 0; |
313 | c->remote_maxpacket = 0; | |
a5f82435 | 314 | c->force_drain = 0; |
ac151b18 | 315 | c->single_connection = 0; |
3cf2be58 | 316 | c->detach_user = NULL; |
8cd0437d | 317 | c->detach_close = 0; |
3593bdc0 | 318 | c->open_confirm = NULL; |
319 | c->open_confirm_ctx = NULL; | |
2e73a022 | 320 | c->input_filter = NULL; |
c1c6a032 | 321 | c->output_filter = NULL; |
e74caf1e | 322 | c->filter_ctx = NULL; |
323 | c->filter_cleanup = NULL; | |
3593bdc0 | 324 | TAILQ_INIT(&c->status_confirms); |
5260325f | 325 | debug("channel %d: new [%s]", found, remote_name); |
719fc62f | 326 | return c; |
7368a6c8 | 327 | } |
8efc0c15 | 328 | |
489aa2e9 | 329 | static int |
330 | channel_find_maxfd(void) | |
331 | { | |
9a995072 | 332 | u_int i; |
333 | int max = 0; | |
489aa2e9 | 334 | Channel *c; |
335 | ||
336 | for (i = 0; i < channels_alloc; i++) { | |
337 | c = channels[i]; | |
338 | if (c != NULL) { | |
339 | max = MAX(max, c->rfd); | |
340 | max = MAX(max, c->wfd); | |
341 | max = MAX(max, c->efd); | |
342 | } | |
343 | } | |
344 | return max; | |
345 | } | |
346 | ||
347 | int | |
348 | channel_close_fd(int *fdp) | |
349 | { | |
350 | int ret = 0, fd = *fdp; | |
351 | ||
352 | if (fd != -1) { | |
353 | ret = close(fd); | |
354 | *fdp = -1; | |
355 | if (fd == channel_max_fd) | |
356 | channel_max_fd = channel_find_maxfd(); | |
357 | } | |
358 | return ret; | |
359 | } | |
360 | ||
0fbe8c74 | 361 | /* Close all channel fd/socket. */ |
396c147e | 362 | static void |
0fbe8c74 | 363 | channel_close_fds(Channel *c) |
364 | { | |
5e96b616 | 365 | debug3("channel %d: close_fds r %d w %d e %d c %d", |
366 | c->self, c->rfd, c->wfd, c->efd, c->ctl_fd); | |
6fd8622b | 367 | |
489aa2e9 | 368 | channel_close_fd(&c->sock); |
5e96b616 | 369 | channel_close_fd(&c->ctl_fd); |
489aa2e9 | 370 | channel_close_fd(&c->rfd); |
371 | channel_close_fd(&c->wfd); | |
372 | channel_close_fd(&c->efd); | |
0fbe8c74 | 373 | } |
374 | ||
8e7895b8 | 375 | /* Free the channel and close its fd/socket. */ |
8e7895b8 | 376 | void |
377 | channel_free(Channel *c) | |
378 | { | |
379 | char *s; | |
9a995072 | 380 | u_int i, n; |
3593bdc0 | 381 | struct channel_confirm *cc; |
8e7895b8 | 382 | |
383 | for (n = 0, i = 0; i < channels_alloc; i++) | |
384 | if (channels[i]) | |
385 | n++; | |
9a995072 | 386 | debug("channel %d: free: %s, nchannels %u", c->self, |
8e7895b8 | 387 | c->remote_name ? c->remote_name : "???", n); |
388 | ||
389 | s = channel_open_message(); | |
d7ac5f18 | 390 | debug3("channel %d: status: %s", c->self, s); |
8e7895b8 | 391 | xfree(s); |
392 | ||
8e7895b8 | 393 | if (c->sock != -1) |
394 | shutdown(c->sock, SHUT_RDWR); | |
5e96b616 | 395 | if (c->ctl_fd != -1) |
396 | shutdown(c->ctl_fd, SHUT_RDWR); | |
8e7895b8 | 397 | channel_close_fds(c); |
398 | buffer_free(&c->input); | |
399 | buffer_free(&c->output); | |
400 | buffer_free(&c->extended); | |
401 | if (c->remote_name) { | |
402 | xfree(c->remote_name); | |
403 | c->remote_name = NULL; | |
404 | } | |
3593bdc0 | 405 | while ((cc = TAILQ_FIRST(&c->status_confirms)) != NULL) { |
406 | if (cc->abandon_cb != NULL) | |
407 | cc->abandon_cb(c, cc->ctx); | |
408 | TAILQ_REMOVE(&c->status_confirms, cc, entry); | |
409 | bzero(cc, sizeof(*cc)); | |
410 | xfree(cc); | |
411 | } | |
e74caf1e | 412 | if (c->filter_cleanup != NULL && c->filter_ctx != NULL) |
413 | c->filter_cleanup(c->self, c->filter_ctx); | |
8e7895b8 | 414 | channels[c->self] = NULL; |
415 | xfree(c); | |
416 | } | |
417 | ||
8e7895b8 | 418 | void |
d6746a0b | 419 | channel_free_all(void) |
8e7895b8 | 420 | { |
9a995072 | 421 | u_int i; |
8e7895b8 | 422 | |
d6746a0b | 423 | for (i = 0; i < channels_alloc; i++) |
424 | if (channels[i] != NULL) | |
425 | channel_free(channels[i]); | |
8e7895b8 | 426 | } |
427 | ||
428 | /* | |
429 | * Closes the sockets/fds of all channels. This is used to close extra file | |
430 | * descriptors after a fork. | |
431 | */ | |
8e7895b8 | 432 | void |
d5bb9418 | 433 | channel_close_all(void) |
8e7895b8 | 434 | { |
9a995072 | 435 | u_int i; |
8e7895b8 | 436 | |
437 | for (i = 0; i < channels_alloc; i++) | |
438 | if (channels[i] != NULL) | |
439 | channel_close_fds(channels[i]); | |
440 | } | |
441 | ||
3cf2be58 | 442 | /* |
443 | * Stop listening to channels. | |
444 | */ | |
3cf2be58 | 445 | void |
446 | channel_stop_listening(void) | |
447 | { | |
9a995072 | 448 | u_int i; |
3cf2be58 | 449 | Channel *c; |
450 | ||
451 | for (i = 0; i < channels_alloc; i++) { | |
452 | c = channels[i]; | |
453 | if (c != NULL) { | |
454 | switch (c->type) { | |
455 | case SSH_CHANNEL_AUTH_SOCKET: | |
456 | case SSH_CHANNEL_PORT_LISTENER: | |
457 | case SSH_CHANNEL_RPORT_LISTENER: | |
458 | case SSH_CHANNEL_X11_LISTENER: | |
489aa2e9 | 459 | channel_close_fd(&c->sock); |
3cf2be58 | 460 | channel_free(c); |
461 | break; | |
462 | } | |
463 | } | |
464 | } | |
465 | } | |
466 | ||
8e7895b8 | 467 | /* |
468 | * Returns true if no channel has too much buffered data, and false if one or | |
469 | * more channel is overfull. | |
470 | */ | |
8e7895b8 | 471 | int |
d5bb9418 | 472 | channel_not_very_much_buffered_data(void) |
8e7895b8 | 473 | { |
474 | u_int i; | |
475 | Channel *c; | |
476 | ||
477 | for (i = 0; i < channels_alloc; i++) { | |
478 | c = channels[i]; | |
479 | if (c != NULL && c->type == SSH_CHANNEL_OPEN) { | |
0c139bd1 | 480 | #if 0 |
481 | if (!compat20 && | |
482 | buffer_len(&c->input) > packet_get_maxsize()) { | |
faa483fa | 483 | debug2("channel %d: big input buffer %d", |
8e7895b8 | 484 | c->self, buffer_len(&c->input)); |
485 | return 0; | |
486 | } | |
0c139bd1 | 487 | #endif |
8e7895b8 | 488 | if (buffer_len(&c->output) > packet_get_maxsize()) { |
a27002e5 | 489 | debug2("channel %d: big output buffer %u > %u", |
0c139bd1 | 490 | c->self, buffer_len(&c->output), |
491 | packet_get_maxsize()); | |
8e7895b8 | 492 | return 0; |
493 | } | |
494 | } | |
495 | } | |
496 | return 1; | |
497 | } | |
498 | ||
499 | /* Returns true if any channel is still open. */ | |
8e7895b8 | 500 | int |
d5bb9418 | 501 | channel_still_open(void) |
8e7895b8 | 502 | { |
9a995072 | 503 | u_int i; |
8e7895b8 | 504 | Channel *c; |
505 | ||
506 | for (i = 0; i < channels_alloc; i++) { | |
507 | c = channels[i]; | |
508 | if (c == NULL) | |
509 | continue; | |
510 | switch (c->type) { | |
511 | case SSH_CHANNEL_X11_LISTENER: | |
512 | case SSH_CHANNEL_PORT_LISTENER: | |
513 | case SSH_CHANNEL_RPORT_LISTENER: | |
514 | case SSH_CHANNEL_CLOSED: | |
515 | case SSH_CHANNEL_AUTH_SOCKET: | |
516 | case SSH_CHANNEL_DYNAMIC: | |
517 | case SSH_CHANNEL_CONNECTING: | |
518 | case SSH_CHANNEL_ZOMBIE: | |
519 | continue; | |
520 | case SSH_CHANNEL_LARVAL: | |
521 | if (!compat20) | |
522 | fatal("cannot happen: SSH_CHANNEL_LARVAL"); | |
523 | continue; | |
524 | case SSH_CHANNEL_OPENING: | |
525 | case SSH_CHANNEL_OPEN: | |
526 | case SSH_CHANNEL_X11_OPEN: | |
527 | return 1; | |
528 | case SSH_CHANNEL_INPUT_DRAINING: | |
529 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
530 | if (!compat13) | |
531 | fatal("cannot happen: OUT_DRAIN"); | |
532 | return 1; | |
533 | default: | |
534 | fatal("channel_still_open: bad channel type %d", c->type); | |
535 | /* NOTREACHED */ | |
536 | } | |
537 | } | |
538 | return 0; | |
539 | } | |
540 | ||
541 | /* Returns the id of an open channel suitable for keepaliving */ | |
8e7895b8 | 542 | int |
d5bb9418 | 543 | channel_find_open(void) |
8e7895b8 | 544 | { |
9a995072 | 545 | u_int i; |
8e7895b8 | 546 | Channel *c; |
547 | ||
548 | for (i = 0; i < channels_alloc; i++) { | |
549 | c = channels[i]; | |
13de3560 | 550 | if (c == NULL || c->remote_id < 0) |
8e7895b8 | 551 | continue; |
552 | switch (c->type) { | |
553 | case SSH_CHANNEL_CLOSED: | |
554 | case SSH_CHANNEL_DYNAMIC: | |
555 | case SSH_CHANNEL_X11_LISTENER: | |
556 | case SSH_CHANNEL_PORT_LISTENER: | |
557 | case SSH_CHANNEL_RPORT_LISTENER: | |
558 | case SSH_CHANNEL_OPENING: | |
559 | case SSH_CHANNEL_CONNECTING: | |
560 | case SSH_CHANNEL_ZOMBIE: | |
561 | continue; | |
562 | case SSH_CHANNEL_LARVAL: | |
563 | case SSH_CHANNEL_AUTH_SOCKET: | |
564 | case SSH_CHANNEL_OPEN: | |
565 | case SSH_CHANNEL_X11_OPEN: | |
566 | return i; | |
567 | case SSH_CHANNEL_INPUT_DRAINING: | |
568 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
569 | if (!compat13) | |
570 | fatal("cannot happen: OUT_DRAIN"); | |
571 | return i; | |
572 | default: | |
573 | fatal("channel_find_open: bad channel type %d", c->type); | |
574 | /* NOTREACHED */ | |
575 | } | |
576 | } | |
577 | return -1; | |
578 | } | |
579 | ||
580 | ||
581 | /* | |
582 | * Returns a message describing the currently open forwarded connections, | |
583 | * suitable for sending to the client. The message contains crlf pairs for | |
584 | * newlines. | |
585 | */ | |
8e7895b8 | 586 | char * |
d5bb9418 | 587 | channel_open_message(void) |
8e7895b8 | 588 | { |
589 | Buffer buffer; | |
590 | Channel *c; | |
591 | char buf[1024], *cp; | |
9a995072 | 592 | u_int i; |
8e7895b8 | 593 | |
594 | buffer_init(&buffer); | |
595 | snprintf(buf, sizeof buf, "The following connections are open:\r\n"); | |
596 | buffer_append(&buffer, buf, strlen(buf)); | |
597 | for (i = 0; i < channels_alloc; i++) { | |
598 | c = channels[i]; | |
599 | if (c == NULL) | |
600 | continue; | |
601 | switch (c->type) { | |
602 | case SSH_CHANNEL_X11_LISTENER: | |
603 | case SSH_CHANNEL_PORT_LISTENER: | |
604 | case SSH_CHANNEL_RPORT_LISTENER: | |
605 | case SSH_CHANNEL_CLOSED: | |
606 | case SSH_CHANNEL_AUTH_SOCKET: | |
607 | case SSH_CHANNEL_ZOMBIE: | |
608 | continue; | |
609 | case SSH_CHANNEL_LARVAL: | |
610 | case SSH_CHANNEL_OPENING: | |
611 | case SSH_CHANNEL_CONNECTING: | |
612 | case SSH_CHANNEL_DYNAMIC: | |
613 | case SSH_CHANNEL_OPEN: | |
614 | case SSH_CHANNEL_X11_OPEN: | |
615 | case SSH_CHANNEL_INPUT_DRAINING: | |
616 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
5e96b616 | 617 | snprintf(buf, sizeof buf, |
618 | " #%d %.300s (t%d r%d i%d/%d o%d/%d fd %d/%d cfd %d)\r\n", | |
8e7895b8 | 619 | c->self, c->remote_name, |
620 | c->type, c->remote_id, | |
621 | c->istate, buffer_len(&c->input), | |
622 | c->ostate, buffer_len(&c->output), | |
5e96b616 | 623 | c->rfd, c->wfd, c->ctl_fd); |
8e7895b8 | 624 | buffer_append(&buffer, buf, strlen(buf)); |
625 | continue; | |
626 | default: | |
627 | fatal("channel_open_message: bad channel type %d", c->type); | |
628 | /* NOTREACHED */ | |
629 | } | |
630 | } | |
631 | buffer_append(&buffer, "\0", 1); | |
632 | cp = xstrdup(buffer_ptr(&buffer)); | |
633 | buffer_free(&buffer); | |
634 | return cp; | |
635 | } | |
636 | ||
637 | void | |
638 | channel_send_open(int id) | |
639 | { | |
640 | Channel *c = channel_lookup(id); | |
e1feb9bf | 641 | |
8e7895b8 | 642 | if (c == NULL) { |
bbe88b6d | 643 | logit("channel_send_open: %d: bad id", id); |
8e7895b8 | 644 | return; |
645 | } | |
6226a8f8 | 646 | debug2("channel %d: send open", id); |
8e7895b8 | 647 | packet_start(SSH2_MSG_CHANNEL_OPEN); |
648 | packet_put_cstring(c->ctype); | |
649 | packet_put_int(c->self); | |
650 | packet_put_int(c->local_window); | |
651 | packet_put_int(c->local_maxpacket); | |
652 | packet_send(); | |
653 | } | |
654 | ||
655 | void | |
6226a8f8 | 656 | channel_request_start(int id, char *service, int wantconfirm) |
8e7895b8 | 657 | { |
6226a8f8 | 658 | Channel *c = channel_lookup(id); |
e1feb9bf | 659 | |
8e7895b8 | 660 | if (c == NULL) { |
bbe88b6d | 661 | logit("channel_request_start: %d: unknown channel id", id); |
8e7895b8 | 662 | return; |
663 | } | |
5e96b616 | 664 | debug2("channel %d: request %s confirm %d", id, service, wantconfirm); |
8e7895b8 | 665 | packet_start(SSH2_MSG_CHANNEL_REQUEST); |
666 | packet_put_int(c->remote_id); | |
667 | packet_put_cstring(service); | |
668 | packet_put_char(wantconfirm); | |
669 | } | |
a7137f6b | 670 | |
8e7895b8 | 671 | void |
3593bdc0 | 672 | channel_register_status_confirm(int id, channel_confirm_cb *cb, |
673 | channel_confirm_abandon_cb *abandon_cb, void *ctx) | |
674 | { | |
675 | struct channel_confirm *cc; | |
676 | Channel *c; | |
677 | ||
678 | if ((c = channel_lookup(id)) == NULL) | |
679 | fatal("channel_register_expect: %d: bad id", id); | |
680 | ||
681 | cc = xmalloc(sizeof(*cc)); | |
682 | cc->cb = cb; | |
683 | cc->abandon_cb = abandon_cb; | |
684 | cc->ctx = ctx; | |
685 | TAILQ_INSERT_TAIL(&c->status_confirms, cc, entry); | |
686 | } | |
687 | ||
688 | void | |
689 | channel_register_open_confirm(int id, channel_callback_fn *fn, void *ctx) | |
8e7895b8 | 690 | { |
691 | Channel *c = channel_lookup(id); | |
e1feb9bf | 692 | |
8e7895b8 | 693 | if (c == NULL) { |
3593bdc0 | 694 | logit("channel_register_open_comfirm: %d: bad id", id); |
8e7895b8 | 695 | return; |
696 | } | |
3593bdc0 | 697 | c->open_confirm = fn; |
698 | c->open_confirm_ctx = ctx; | |
8e7895b8 | 699 | } |
a7137f6b | 700 | |
8e7895b8 | 701 | void |
8cd0437d | 702 | channel_register_cleanup(int id, channel_callback_fn *fn, int do_close) |
8e7895b8 | 703 | { |
b872f7f0 | 704 | Channel *c = channel_by_id(id); |
e1feb9bf | 705 | |
8e7895b8 | 706 | if (c == NULL) { |
bbe88b6d | 707 | logit("channel_register_cleanup: %d: bad id", id); |
8e7895b8 | 708 | return; |
709 | } | |
3cf2be58 | 710 | c->detach_user = fn; |
8cd0437d | 711 | c->detach_close = do_close; |
8e7895b8 | 712 | } |
a7137f6b | 713 | |
8e7895b8 | 714 | void |
715 | channel_cancel_cleanup(int id) | |
716 | { | |
b872f7f0 | 717 | Channel *c = channel_by_id(id); |
e1feb9bf | 718 | |
8e7895b8 | 719 | if (c == NULL) { |
bbe88b6d | 720 | logit("channel_cancel_cleanup: %d: bad id", id); |
8e7895b8 | 721 | return; |
722 | } | |
3cf2be58 | 723 | c->detach_user = NULL; |
8cd0437d | 724 | c->detach_close = 0; |
8e7895b8 | 725 | } |
a7137f6b | 726 | |
8e7895b8 | 727 | void |
c1c6a032 | 728 | channel_register_filter(int id, channel_infilter_fn *ifn, |
e74caf1e | 729 | channel_outfilter_fn *ofn, channel_filter_cleanup_fn *cfn, void *ctx) |
8e7895b8 | 730 | { |
731 | Channel *c = channel_lookup(id); | |
e1feb9bf | 732 | |
8e7895b8 | 733 | if (c == NULL) { |
bbe88b6d | 734 | logit("channel_register_filter: %d: bad id", id); |
8e7895b8 | 735 | return; |
736 | } | |
c1c6a032 | 737 | c->input_filter = ifn; |
738 | c->output_filter = ofn; | |
f17f705b | 739 | c->filter_ctx = ctx; |
e74caf1e | 740 | c->filter_cleanup = cfn; |
8e7895b8 | 741 | } |
742 | ||
6ae2364d | 743 | void |
8e7895b8 | 744 | channel_set_fds(int id, int rfd, int wfd, int efd, |
b3784859 | 745 | int extusage, int nonblock, int is_tty, u_int window_max) |
8efc0c15 | 746 | { |
8e7895b8 | 747 | Channel *c = channel_lookup(id); |
e1feb9bf | 748 | |
8e7895b8 | 749 | if (c == NULL || c->type != SSH_CHANNEL_LARVAL) |
750 | fatal("channel_activate for non-larval channel %d.", id); | |
b3784859 | 751 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock, is_tty); |
8e7895b8 | 752 | c->type = SSH_CHANNEL_OPEN; |
399d1ea6 | 753 | c->local_window = c->local_window_max = window_max; |
8e7895b8 | 754 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
755 | packet_put_int(c->remote_id); | |
756 | packet_put_int(c->local_window); | |
757 | packet_send(); | |
8efc0c15 | 758 | } |
759 | ||
aa3378df | 760 | /* |
7368a6c8 | 761 | * 'channel_pre*' are called just before select() to add any bits relevant to |
762 | * channels in the select bitmasks. | |
aa3378df | 763 | */ |
7368a6c8 | 764 | /* |
765 | * 'channel_post*': perform any appropriate operations for channels which | |
766 | * have events pending. | |
767 | */ | |
c8e9c167 | 768 | typedef void chan_fn(Channel *c, fd_set *readset, fd_set *writeset); |
7368a6c8 | 769 | chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE]; |
770 | chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE]; | |
8efc0c15 | 771 | |
ebb90778 | 772 | /* ARGSUSED */ |
396c147e | 773 | static void |
c8e9c167 | 774 | channel_pre_listener(Channel *c, fd_set *readset, fd_set *writeset) |
8efc0c15 | 775 | { |
7368a6c8 | 776 | FD_SET(c->sock, readset); |
777 | } | |
5260325f | 778 | |
ebb90778 | 779 | /* ARGSUSED */ |
396c147e | 780 | static void |
c8e9c167 | 781 | channel_pre_connecting(Channel *c, fd_set *readset, fd_set *writeset) |
97fb6912 | 782 | { |
783 | debug3("channel %d: waiting for connection", c->self); | |
784 | FD_SET(c->sock, writeset); | |
785 | } | |
786 | ||
396c147e | 787 | static void |
c8e9c167 | 788 | channel_pre_open_13(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 789 | { |
790 | if (buffer_len(&c->input) < packet_get_maxsize()) | |
791 | FD_SET(c->sock, readset); | |
792 | if (buffer_len(&c->output) > 0) | |
793 | FD_SET(c->sock, writeset); | |
794 | } | |
5260325f | 795 | |
396c147e | 796 | static void |
c8e9c167 | 797 | channel_pre_open(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 798 | { |
0c0738d5 | 799 | u_int limit = compat20 ? c->remote_window : packet_get_maxsize(); |
5260325f | 800 | |
7e7327a1 | 801 | if (c->istate == CHAN_INPUT_OPEN && |
0c0738d5 | 802 | limit > 0 && |
69d9d413 | 803 | buffer_len(&c->input) < limit && |
804 | buffer_check_alloc(&c->input, CHAN_RBUF)) | |
7e7327a1 | 805 | FD_SET(c->rfd, readset); |
806 | if (c->ostate == CHAN_OUTPUT_OPEN || | |
807 | c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { | |
808 | if (buffer_len(&c->output) > 0) { | |
809 | FD_SET(c->wfd, writeset); | |
810 | } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { | |
d2296ed7 | 811 | if (CHANNEL_EFD_OUTPUT_ACTIVE(c)) |
4e2e5cfd | 812 | debug2("channel %d: obuf_empty delayed efd %d/(%d)", |
813 | c->self, c->efd, buffer_len(&c->extended)); | |
d2296ed7 | 814 | else |
815 | chan_obuf_empty(c); | |
7e7327a1 | 816 | } |
817 | } | |
818 | /** XXX check close conditions, too */ | |
271f4a13 | 819 | if (compat20 && c->efd != -1 && |
820 | !(c->istate == CHAN_INPUT_CLOSED && c->ostate == CHAN_OUTPUT_CLOSED)) { | |
7e7327a1 | 821 | if (c->extended_usage == CHAN_EXTENDED_WRITE && |
822 | buffer_len(&c->extended) > 0) | |
823 | FD_SET(c->efd, writeset); | |
d2296ed7 | 824 | else if (!(c->flags & CHAN_EOF_SENT) && |
825 | c->extended_usage == CHAN_EXTENDED_READ && | |
7e7327a1 | 826 | buffer_len(&c->extended) < c->remote_window) |
827 | FD_SET(c->efd, readset); | |
828 | } | |
5e96b616 | 829 | /* XXX: What about efd? races? */ |
f2107e97 | 830 | if (compat20 && c->ctl_fd != -1 && |
5e96b616 | 831 | c->istate == CHAN_INPUT_OPEN && c->ostate == CHAN_OUTPUT_OPEN) |
832 | FD_SET(c->ctl_fd, readset); | |
7e7327a1 | 833 | } |
834 | ||
ebb90778 | 835 | /* ARGSUSED */ |
396c147e | 836 | static void |
c8e9c167 | 837 | channel_pre_input_draining(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 838 | { |
839 | if (buffer_len(&c->input) == 0) { | |
840 | packet_start(SSH_MSG_CHANNEL_CLOSE); | |
841 | packet_put_int(c->remote_id); | |
842 | packet_send(); | |
843 | c->type = SSH_CHANNEL_CLOSED; | |
d7ac5f18 | 844 | debug2("channel %d: closing after input drain.", c->self); |
7368a6c8 | 845 | } |
846 | } | |
5260325f | 847 | |
ebb90778 | 848 | /* ARGSUSED */ |
396c147e | 849 | static void |
c8e9c167 | 850 | channel_pre_output_draining(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 851 | { |
852 | if (buffer_len(&c->output) == 0) | |
719fc62f | 853 | chan_mark_dead(c); |
6ae2364d | 854 | else |
7368a6c8 | 855 | FD_SET(c->sock, writeset); |
856 | } | |
5260325f | 857 | |
7368a6c8 | 858 | /* |
859 | * This is a special state for X11 authentication spoofing. An opened X11 | |
860 | * connection (when authentication spoofing is being done) remains in this | |
861 | * state until the first packet has been completely read. The authentication | |
862 | * data in that packet is then substituted by the real data if it matches the | |
863 | * fake data, and the channel is put into normal mode. | |
0b242b12 | 864 | * XXX All this happens at the client side. |
8e7895b8 | 865 | * Returns: 0 = need more data, -1 = wrong cookie, 1 = ok |
7368a6c8 | 866 | */ |
396c147e | 867 | static int |
8e7895b8 | 868 | x11_open_helper(Buffer *b) |
7368a6c8 | 869 | { |
1e3b8b07 | 870 | u_char *ucp; |
871 | u_int proto_len, data_len; | |
5260325f | 872 | |
7368a6c8 | 873 | /* Check if the fixed size part of the packet is in buffer. */ |
8e7895b8 | 874 | if (buffer_len(b) < 12) |
7368a6c8 | 875 | return 0; |
876 | ||
877 | /* Parse the lengths of variable-length fields. */ | |
20905a8e | 878 | ucp = buffer_ptr(b); |
7368a6c8 | 879 | if (ucp[0] == 0x42) { /* Byte order MSB first. */ |
880 | proto_len = 256 * ucp[6] + ucp[7]; | |
881 | data_len = 256 * ucp[8] + ucp[9]; | |
882 | } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */ | |
883 | proto_len = ucp[6] + 256 * ucp[7]; | |
884 | data_len = ucp[8] + 256 * ucp[9]; | |
885 | } else { | |
d7ac5f18 | 886 | debug2("Initial X11 packet contains bad byte order byte: 0x%x", |
184eed6a | 887 | ucp[0]); |
7368a6c8 | 888 | return -1; |
889 | } | |
5260325f | 890 | |
7368a6c8 | 891 | /* Check if the whole packet is in buffer. */ |
8e7895b8 | 892 | if (buffer_len(b) < |
7368a6c8 | 893 | 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3)) |
894 | return 0; | |
5260325f | 895 | |
7368a6c8 | 896 | /* Check if authentication protocol matches. */ |
897 | if (proto_len != strlen(x11_saved_proto) || | |
898 | memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) { | |
d7ac5f18 | 899 | debug2("X11 connection uses different authentication protocol."); |
7368a6c8 | 900 | return -1; |
901 | } | |
902 | /* Check if authentication data matches our fake data. */ | |
903 | if (data_len != x11_fake_data_len || | |
904 | memcmp(ucp + 12 + ((proto_len + 3) & ~3), | |
905 | x11_fake_data, x11_fake_data_len) != 0) { | |
d7ac5f18 | 906 | debug2("X11 auth data does not match fake data."); |
7368a6c8 | 907 | return -1; |
908 | } | |
909 | /* Check fake data length */ | |
910 | if (x11_fake_data_len != x11_saved_data_len) { | |
911 | error("X11 fake_data_len %d != saved_data_len %d", | |
912 | x11_fake_data_len, x11_saved_data_len); | |
913 | return -1; | |
914 | } | |
915 | /* | |
916 | * Received authentication protocol and data match | |
917 | * our fake data. Substitute the fake data with real | |
918 | * data. | |
919 | */ | |
920 | memcpy(ucp + 12 + ((proto_len + 3) & ~3), | |
921 | x11_saved_data, x11_saved_data_len); | |
922 | return 1; | |
923 | } | |
5260325f | 924 | |
396c147e | 925 | static void |
c8e9c167 | 926 | channel_pre_x11_open_13(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 927 | { |
8e7895b8 | 928 | int ret = x11_open_helper(&c->output); |
e1feb9bf | 929 | |
7368a6c8 | 930 | if (ret == 1) { |
931 | /* Start normal processing for the channel. */ | |
932 | c->type = SSH_CHANNEL_OPEN; | |
a8be9f80 | 933 | channel_pre_open_13(c, readset, writeset); |
7368a6c8 | 934 | } else if (ret == -1) { |
935 | /* | |
936 | * We have received an X11 connection that has bad | |
937 | * authentication information. | |
938 | */ | |
bbe88b6d | 939 | logit("X11 connection rejected because of wrong authentication."); |
7368a6c8 | 940 | buffer_clear(&c->input); |
941 | buffer_clear(&c->output); | |
489aa2e9 | 942 | channel_close_fd(&c->sock); |
7368a6c8 | 943 | c->sock = -1; |
944 | c->type = SSH_CHANNEL_CLOSED; | |
945 | packet_start(SSH_MSG_CHANNEL_CLOSE); | |
946 | packet_put_int(c->remote_id); | |
947 | packet_send(); | |
948 | } | |
949 | } | |
5260325f | 950 | |
396c147e | 951 | static void |
c8e9c167 | 952 | channel_pre_x11_open(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 953 | { |
8e7895b8 | 954 | int ret = x11_open_helper(&c->output); |
a5f82435 | 955 | |
956 | /* c->force_drain = 1; */ | |
957 | ||
7368a6c8 | 958 | if (ret == 1) { |
959 | c->type = SSH_CHANNEL_OPEN; | |
0c0738d5 | 960 | channel_pre_open(c, readset, writeset); |
7368a6c8 | 961 | } else if (ret == -1) { |
bbe88b6d | 962 | logit("X11 connection rejected because of wrong authentication."); |
d7ac5f18 | 963 | debug2("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate); |
8341f420 | 964 | chan_read_failed(c); |
965 | buffer_clear(&c->input); | |
966 | chan_ibuf_empty(c); | |
967 | buffer_clear(&c->output); | |
968 | /* for proto v1, the peer will send an IEOF */ | |
969 | if (compat20) | |
970 | chan_write_failed(c); | |
971 | else | |
972 | c->type = SSH_CHANNEL_OPEN; | |
d7ac5f18 | 973 | debug2("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate); |
7368a6c8 | 974 | } |
975 | } | |
5260325f | 976 | |
28b9cb4d | 977 | /* try to decode a socks4 header */ |
ebb90778 | 978 | /* ARGSUSED */ |
396c147e | 979 | static int |
c8e9c167 | 980 | channel_decode_socks4(Channel *c, fd_set *readset, fd_set *writeset) |
0490e609 | 981 | { |
661e45a0 | 982 | char *p, *host; |
2ceb8101 | 983 | u_int len, have, i, found; |
184eed6a | 984 | char username[256]; |
0490e609 | 985 | struct { |
986 | u_int8_t version; | |
987 | u_int8_t command; | |
988 | u_int16_t dest_port; | |
28b9cb4d | 989 | struct in_addr dest_addr; |
0490e609 | 990 | } s4_req, s4_rsp; |
991 | ||
28b9cb4d | 992 | debug2("channel %d: decode socks4", c->self); |
53b8fe68 | 993 | |
994 | have = buffer_len(&c->input); | |
995 | len = sizeof(s4_req); | |
996 | if (have < len) | |
997 | return 0; | |
998 | p = buffer_ptr(&c->input); | |
999 | for (found = 0, i = len; i < have; i++) { | |
1000 | if (p[i] == '\0') { | |
1001 | found = 1; | |
1002 | break; | |
1003 | } | |
1004 | if (i > 1024) { | |
1005 | /* the peer is probably sending garbage */ | |
1006 | debug("channel %d: decode socks4: too long", | |
1007 | c->self); | |
1008 | return -1; | |
1009 | } | |
1010 | } | |
1011 | if (!found) | |
1012 | return 0; | |
0490e609 | 1013 | buffer_get(&c->input, (char *)&s4_req.version, 1); |
1014 | buffer_get(&c->input, (char *)&s4_req.command, 1); | |
1015 | buffer_get(&c->input, (char *)&s4_req.dest_port, 2); | |
28b9cb4d | 1016 | buffer_get(&c->input, (char *)&s4_req.dest_addr, 4); |
53b8fe68 | 1017 | have = buffer_len(&c->input); |
0490e609 | 1018 | p = buffer_ptr(&c->input); |
1019 | len = strlen(p); | |
6683b40f | 1020 | debug2("channel %d: decode socks4: user %s/%d", c->self, p, len); |
0490e609 | 1021 | if (len > have) |
28b9cb4d | 1022 | fatal("channel %d: decode socks4: len %d > have %d", |
0490e609 | 1023 | c->self, len, have); |
1024 | strlcpy(username, p, sizeof(username)); | |
1025 | buffer_consume(&c->input, len); | |
1026 | buffer_consume(&c->input, 1); /* trailing '\0' */ | |
1027 | ||
28b9cb4d | 1028 | host = inet_ntoa(s4_req.dest_addr); |
0490e609 | 1029 | strlcpy(c->path, host, sizeof(c->path)); |
1030 | c->host_port = ntohs(s4_req.dest_port); | |
184eed6a | 1031 | |
d7ac5f18 | 1032 | debug2("channel %d: dynamic request: socks4 host %s port %u command %u", |
6683b40f | 1033 | c->self, host, c->host_port, s4_req.command); |
0490e609 | 1034 | |
28b9cb4d | 1035 | if (s4_req.command != 1) { |
1036 | debug("channel %d: cannot handle: socks4 cn %d", | |
1037 | c->self, s4_req.command); | |
1038 | return -1; | |
0490e609 | 1039 | } |
28b9cb4d | 1040 | s4_rsp.version = 0; /* vn: 0 for reply */ |
1041 | s4_rsp.command = 90; /* cd: req granted */ | |
0490e609 | 1042 | s4_rsp.dest_port = 0; /* ignored */ |
28b9cb4d | 1043 | s4_rsp.dest_addr.s_addr = INADDR_ANY; /* ignored */ |
15dd2c4f | 1044 | buffer_append(&c->output, &s4_rsp, sizeof(s4_rsp)); |
28b9cb4d | 1045 | return 1; |
0490e609 | 1046 | } |
1047 | ||
f49658f5 | 1048 | /* try to decode a socks5 header */ |
1049 | #define SSH_SOCKS5_AUTHDONE 0x1000 | |
1050 | #define SSH_SOCKS5_NOAUTH 0x00 | |
1051 | #define SSH_SOCKS5_IPV4 0x01 | |
1052 | #define SSH_SOCKS5_DOMAIN 0x03 | |
1053 | #define SSH_SOCKS5_IPV6 0x04 | |
1054 | #define SSH_SOCKS5_CONNECT 0x01 | |
1055 | #define SSH_SOCKS5_SUCCESS 0x00 | |
1056 | ||
ebb90778 | 1057 | /* ARGSUSED */ |
f49658f5 | 1058 | static int |
c8e9c167 | 1059 | channel_decode_socks5(Channel *c, fd_set *readset, fd_set *writeset) |
f49658f5 | 1060 | { |
1061 | struct { | |
1062 | u_int8_t version; | |
1063 | u_int8_t command; | |
1064 | u_int8_t reserved; | |
1065 | u_int8_t atyp; | |
1066 | } s5_req, s5_rsp; | |
1067 | u_int16_t dest_port; | |
1068 | u_char *p, dest_addr[255+1]; | |
a217e418 | 1069 | u_int have, need, i, found, nmethods, addrlen, af; |
f49658f5 | 1070 | |
1071 | debug2("channel %d: decode socks5", c->self); | |
1072 | p = buffer_ptr(&c->input); | |
1073 | if (p[0] != 0x05) | |
1074 | return -1; | |
1075 | have = buffer_len(&c->input); | |
1076 | if (!(c->flags & SSH_SOCKS5_AUTHDONE)) { | |
1077 | /* format: ver | nmethods | methods */ | |
aff51935 | 1078 | if (have < 2) |
f49658f5 | 1079 | return 0; |
1080 | nmethods = p[1]; | |
1081 | if (have < nmethods + 2) | |
1082 | return 0; | |
1083 | /* look for method: "NO AUTHENTICATION REQUIRED" */ | |
4f6e2ba9 | 1084 | for (found = 0, i = 2; i < nmethods + 2; i++) { |
d4f40d92 | 1085 | if (p[i] == SSH_SOCKS5_NOAUTH) { |
f49658f5 | 1086 | found = 1; |
1087 | break; | |
1088 | } | |
1089 | } | |
1090 | if (!found) { | |
1091 | debug("channel %d: method SSH_SOCKS5_NOAUTH not found", | |
1092 | c->self); | |
1093 | return -1; | |
1094 | } | |
1095 | buffer_consume(&c->input, nmethods + 2); | |
1096 | buffer_put_char(&c->output, 0x05); /* version */ | |
1097 | buffer_put_char(&c->output, SSH_SOCKS5_NOAUTH); /* method */ | |
1098 | FD_SET(c->sock, writeset); | |
1099 | c->flags |= SSH_SOCKS5_AUTHDONE; | |
1100 | debug2("channel %d: socks5 auth done", c->self); | |
1101 | return 0; /* need more */ | |
1102 | } | |
1103 | debug2("channel %d: socks5 post auth", c->self); | |
1104 | if (have < sizeof(s5_req)+1) | |
1105 | return 0; /* need more */ | |
5b5f6af7 | 1106 | memcpy(&s5_req, p, sizeof(s5_req)); |
f49658f5 | 1107 | if (s5_req.version != 0x05 || |
1108 | s5_req.command != SSH_SOCKS5_CONNECT || | |
1109 | s5_req.reserved != 0x00) { | |
d7ac5f18 | 1110 | debug2("channel %d: only socks5 connect supported", c->self); |
f49658f5 | 1111 | return -1; |
1112 | } | |
f8cc7664 | 1113 | switch (s5_req.atyp){ |
f49658f5 | 1114 | case SSH_SOCKS5_IPV4: |
1115 | addrlen = 4; | |
1116 | af = AF_INET; | |
1117 | break; | |
1118 | case SSH_SOCKS5_DOMAIN: | |
1119 | addrlen = p[sizeof(s5_req)]; | |
1120 | af = -1; | |
1121 | break; | |
1122 | case SSH_SOCKS5_IPV6: | |
1123 | addrlen = 16; | |
1124 | af = AF_INET6; | |
1125 | break; | |
1126 | default: | |
d7ac5f18 | 1127 | debug2("channel %d: bad socks5 atyp %d", c->self, s5_req.atyp); |
f49658f5 | 1128 | return -1; |
1129 | } | |
a217e418 | 1130 | need = sizeof(s5_req) + addrlen + 2; |
1131 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) | |
1132 | need++; | |
1133 | if (have < need) | |
f49658f5 | 1134 | return 0; |
1135 | buffer_consume(&c->input, sizeof(s5_req)); | |
1136 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) | |
1137 | buffer_consume(&c->input, 1); /* host string length */ | |
1138 | buffer_get(&c->input, (char *)&dest_addr, addrlen); | |
1139 | buffer_get(&c->input, (char *)&dest_port, 2); | |
1140 | dest_addr[addrlen] = '\0'; | |
1141 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) | |
f6be21a0 | 1142 | strlcpy(c->path, (char *)dest_addr, sizeof(c->path)); |
f49658f5 | 1143 | else if (inet_ntop(af, dest_addr, c->path, sizeof(c->path)) == NULL) |
1144 | return -1; | |
1145 | c->host_port = ntohs(dest_port); | |
b6453d99 | 1146 | |
d7ac5f18 | 1147 | debug2("channel %d: dynamic request: socks5 host %s port %u command %u", |
f49658f5 | 1148 | c->self, c->path, c->host_port, s5_req.command); |
1149 | ||
1150 | s5_rsp.version = 0x05; | |
1151 | s5_rsp.command = SSH_SOCKS5_SUCCESS; | |
1152 | s5_rsp.reserved = 0; /* ignored */ | |
1153 | s5_rsp.atyp = SSH_SOCKS5_IPV4; | |
1154 | ((struct in_addr *)&dest_addr)->s_addr = INADDR_ANY; | |
1155 | dest_port = 0; /* ignored */ | |
1156 | ||
15dd2c4f | 1157 | buffer_append(&c->output, &s5_rsp, sizeof(s5_rsp)); |
1158 | buffer_append(&c->output, &dest_addr, sizeof(struct in_addr)); | |
1159 | buffer_append(&c->output, &dest_port, sizeof(dest_port)); | |
f49658f5 | 1160 | return 1; |
1161 | } | |
1162 | ||
28b9cb4d | 1163 | /* dynamic port forwarding */ |
396c147e | 1164 | static void |
c8e9c167 | 1165 | channel_pre_dynamic(Channel *c, fd_set *readset, fd_set *writeset) |
28b9cb4d | 1166 | { |
1167 | u_char *p; | |
2ceb8101 | 1168 | u_int have; |
1169 | int ret; | |
28b9cb4d | 1170 | |
1171 | have = buffer_len(&c->input); | |
639cb8ab | 1172 | c->delayed = 0; |
28b9cb4d | 1173 | debug2("channel %d: pre_dynamic: have %d", c->self, have); |
070adba2 | 1174 | /* buffer_dump(&c->input); */ |
28b9cb4d | 1175 | /* check if the fixed size part of the packet is in buffer. */ |
f49658f5 | 1176 | if (have < 3) { |
28b9cb4d | 1177 | /* need more */ |
1178 | FD_SET(c->sock, readset); | |
1179 | return; | |
1180 | } | |
1181 | /* try to guess the protocol */ | |
1182 | p = buffer_ptr(&c->input); | |
1183 | switch (p[0]) { | |
6683b40f | 1184 | case 0x04: |
1185 | ret = channel_decode_socks4(c, readset, writeset); | |
1186 | break; | |
f49658f5 | 1187 | case 0x05: |
1188 | ret = channel_decode_socks5(c, readset, writeset); | |
1189 | break; | |
28b9cb4d | 1190 | default: |
1191 | ret = -1; | |
1192 | break; | |
1193 | } | |
1194 | if (ret < 0) { | |
719fc62f | 1195 | chan_mark_dead(c); |
28b9cb4d | 1196 | } else if (ret == 0) { |
1197 | debug2("channel %d: pre_dynamic: need more", c->self); | |
1198 | /* need more */ | |
1199 | FD_SET(c->sock, readset); | |
1200 | } else { | |
1201 | /* switch to the next state */ | |
1202 | c->type = SSH_CHANNEL_OPENING; | |
1203 | port_open_helper(c, "direct-tcpip"); | |
1204 | } | |
1205 | } | |
0490e609 | 1206 | |
7368a6c8 | 1207 | /* This is our fake X11 server socket. */ |
ebb90778 | 1208 | /* ARGSUSED */ |
396c147e | 1209 | static void |
c8e9c167 | 1210 | channel_post_x11_listener(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1211 | { |
719fc62f | 1212 | Channel *nc; |
7368a6c8 | 1213 | struct sockaddr addr; |
bcc0381e | 1214 | int newsock; |
7368a6c8 | 1215 | socklen_t addrlen; |
865ac82e | 1216 | char buf[16384], *remote_ipaddr; |
0b242b12 | 1217 | int remote_port; |
7368a6c8 | 1218 | |
1219 | if (FD_ISSET(c->sock, readset)) { | |
1220 | debug("X11 connection requested."); | |
1221 | addrlen = sizeof(addr); | |
1222 | newsock = accept(c->sock, &addr, &addrlen); | |
ac151b18 | 1223 | if (c->single_connection) { |
d7ac5f18 | 1224 | debug2("single_connection: closing X11 listener."); |
ac151b18 | 1225 | channel_close_fd(&c->sock); |
1226 | chan_mark_dead(c); | |
1227 | } | |
7368a6c8 | 1228 | if (newsock < 0) { |
1229 | error("accept: %.100s", strerror(errno)); | |
1230 | return; | |
5260325f | 1231 | } |
bcc0381e | 1232 | set_nodelay(newsock); |
865ac82e | 1233 | remote_ipaddr = get_peer_ipaddr(newsock); |
0b242b12 | 1234 | remote_port = get_peer_port(newsock); |
7368a6c8 | 1235 | snprintf(buf, sizeof buf, "X11 connection from %.200s port %d", |
865ac82e | 1236 | remote_ipaddr, remote_port); |
0b242b12 | 1237 | |
719fc62f | 1238 | nc = channel_new("accepted x11 socket", |
0b242b12 | 1239 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
0d942eff | 1240 | c->local_window_max, c->local_maxpacket, 0, buf, 1); |
0b242b12 | 1241 | if (compat20) { |
1242 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1243 | packet_put_cstring("x11"); | |
719fc62f | 1244 | packet_put_int(nc->self); |
ac151b18 | 1245 | packet_put_int(nc->local_window_max); |
1246 | packet_put_int(nc->local_maxpacket); | |
865ac82e | 1247 | /* originator ipaddr and port */ |
1248 | packet_put_cstring(remote_ipaddr); | |
d0c832f3 | 1249 | if (datafellows & SSH_BUG_X11FWD) { |
d7ac5f18 | 1250 | debug2("ssh2 x11 bug compat mode"); |
d0c832f3 | 1251 | } else { |
1252 | packet_put_int(remote_port); | |
1253 | } | |
0b242b12 | 1254 | packet_send(); |
1255 | } else { | |
1256 | packet_start(SSH_SMSG_X11_OPEN); | |
719fc62f | 1257 | packet_put_int(nc->self); |
8e7895b8 | 1258 | if (packet_get_protocol_flags() & |
1259 | SSH_PROTOFLAG_HOST_IN_FWD_OPEN) | |
449c5ba5 | 1260 | packet_put_cstring(buf); |
0b242b12 | 1261 | packet_send(); |
1262 | } | |
865ac82e | 1263 | xfree(remote_ipaddr); |
8efc0c15 | 1264 | } |
8efc0c15 | 1265 | } |
1266 | ||
396c147e | 1267 | static void |
0490e609 | 1268 | port_open_helper(Channel *c, char *rtype) |
1269 | { | |
1270 | int direct; | |
1271 | char buf[1024]; | |
1272 | char *remote_ipaddr = get_peer_ipaddr(c->sock); | |
29798ed0 | 1273 | int remote_port = get_peer_port(c->sock); |
0490e609 | 1274 | |
1275 | direct = (strcmp(rtype, "direct-tcpip") == 0); | |
1276 | ||
1277 | snprintf(buf, sizeof buf, | |
1278 | "%s: listening port %d for %.100s port %d, " | |
1279 | "connect from %.200s port %d", | |
1280 | rtype, c->listening_port, c->path, c->host_port, | |
1281 | remote_ipaddr, remote_port); | |
1282 | ||
1283 | xfree(c->remote_name); | |
1284 | c->remote_name = xstrdup(buf); | |
1285 | ||
1286 | if (compat20) { | |
1287 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1288 | packet_put_cstring(rtype); | |
1289 | packet_put_int(c->self); | |
1290 | packet_put_int(c->local_window_max); | |
1291 | packet_put_int(c->local_maxpacket); | |
1292 | if (direct) { | |
1293 | /* target host, port */ | |
1294 | packet_put_cstring(c->path); | |
1295 | packet_put_int(c->host_port); | |
1296 | } else { | |
1297 | /* listen address, port */ | |
1298 | packet_put_cstring(c->path); | |
1299 | packet_put_int(c->listening_port); | |
1300 | } | |
1301 | /* originator host and port */ | |
1302 | packet_put_cstring(remote_ipaddr); | |
29798ed0 | 1303 | packet_put_int((u_int)remote_port); |
0490e609 | 1304 | packet_send(); |
1305 | } else { | |
1306 | packet_start(SSH_MSG_PORT_OPEN); | |
1307 | packet_put_int(c->self); | |
1308 | packet_put_cstring(c->path); | |
1309 | packet_put_int(c->host_port); | |
8e7895b8 | 1310 | if (packet_get_protocol_flags() & |
1311 | SSH_PROTOFLAG_HOST_IN_FWD_OPEN) | |
0490e609 | 1312 | packet_put_cstring(c->remote_name); |
1313 | packet_send(); | |
1314 | } | |
1315 | xfree(remote_ipaddr); | |
1316 | } | |
1317 | ||
442aee3a | 1318 | static void |
1319 | channel_set_reuseaddr(int fd) | |
1320 | { | |
1321 | int on = 1; | |
1322 | ||
1323 | /* | |
1324 | * Set socket options. | |
1325 | * Allow local port reuse in TIME_WAIT. | |
1326 | */ | |
1327 | if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1) | |
1328 | error("setsockopt SO_REUSEADDR fd %d: %s", fd, strerror(errno)); | |
1329 | } | |
1330 | ||
aa3378df | 1331 | /* |
7368a6c8 | 1332 | * This socket is listening for connections to a forwarded TCP/IP port. |
aa3378df | 1333 | */ |
ebb90778 | 1334 | /* ARGSUSED */ |
396c147e | 1335 | static void |
c8e9c167 | 1336 | channel_post_port_listener(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1337 | { |
0490e609 | 1338 | Channel *nc; |
7368a6c8 | 1339 | struct sockaddr addr; |
719fc62f | 1340 | int newsock, nextstate; |
7368a6c8 | 1341 | socklen_t addrlen; |
0490e609 | 1342 | char *rtype; |
fa08c86b | 1343 | |
7368a6c8 | 1344 | if (FD_ISSET(c->sock, readset)) { |
1345 | debug("Connection to port %d forwarding " | |
1346 | "to %.100s port %d requested.", | |
1347 | c->listening_port, c->path, c->host_port); | |
0490e609 | 1348 | |
639cb8ab | 1349 | if (c->type == SSH_CHANNEL_RPORT_LISTENER) { |
1350 | nextstate = SSH_CHANNEL_OPENING; | |
1351 | rtype = "forwarded-tcpip"; | |
1352 | } else { | |
1353 | if (c->host_port == 0) { | |
1354 | nextstate = SSH_CHANNEL_DYNAMIC; | |
f3964cb9 | 1355 | rtype = "dynamic-tcpip"; |
639cb8ab | 1356 | } else { |
1357 | nextstate = SSH_CHANNEL_OPENING; | |
1358 | rtype = "direct-tcpip"; | |
1359 | } | |
1360 | } | |
0490e609 | 1361 | |
7368a6c8 | 1362 | addrlen = sizeof(addr); |
1363 | newsock = accept(c->sock, &addr, &addrlen); | |
1364 | if (newsock < 0) { | |
1365 | error("accept: %.100s", strerror(errno)); | |
1366 | return; | |
1367 | } | |
811a6342 | 1368 | set_nodelay(newsock); |
0d942eff | 1369 | nc = channel_new(rtype, nextstate, newsock, newsock, -1, |
1370 | c->local_window_max, c->local_maxpacket, 0, rtype, 1); | |
0490e609 | 1371 | nc->listening_port = c->listening_port; |
1372 | nc->host_port = c->host_port; | |
1373 | strlcpy(nc->path, c->path, sizeof(nc->path)); | |
1374 | ||
639cb8ab | 1375 | if (nextstate == SSH_CHANNEL_DYNAMIC) { |
1376 | /* | |
1377 | * do not call the channel_post handler until | |
1378 | * this flag has been reset by a pre-handler. | |
1379 | * otherwise the FD_ISSET calls might overflow | |
1380 | */ | |
1381 | nc->delayed = 1; | |
1382 | } else { | |
0490e609 | 1383 | port_open_helper(nc, rtype); |
639cb8ab | 1384 | } |
7368a6c8 | 1385 | } |
1386 | } | |
8efc0c15 | 1387 | |
7368a6c8 | 1388 | /* |
1389 | * This is the authentication agent socket listening for connections from | |
1390 | * clients. | |
1391 | */ | |
ebb90778 | 1392 | /* ARGSUSED */ |
396c147e | 1393 | static void |
c8e9c167 | 1394 | channel_post_auth_listener(Channel *c, fd_set *readset, fd_set *writeset) |
8efc0c15 | 1395 | { |
719fc62f | 1396 | Channel *nc; |
1397 | int newsock; | |
5260325f | 1398 | struct sockaddr addr; |
48e671d5 | 1399 | socklen_t addrlen; |
5260325f | 1400 | |
7368a6c8 | 1401 | if (FD_ISSET(c->sock, readset)) { |
1402 | addrlen = sizeof(addr); | |
1403 | newsock = accept(c->sock, &addr, &addrlen); | |
1404 | if (newsock < 0) { | |
1405 | error("accept from auth socket: %.100s", strerror(errno)); | |
1406 | return; | |
1407 | } | |
719fc62f | 1408 | nc = channel_new("accepted auth socket", |
fa08c86b | 1409 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
1410 | c->local_window_max, c->local_maxpacket, | |
0d942eff | 1411 | 0, "accepted auth socket", 1); |
fa08c86b | 1412 | if (compat20) { |
1413 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1414 | packet_put_cstring("auth-agent@openssh.com"); | |
719fc62f | 1415 | packet_put_int(nc->self); |
fa08c86b | 1416 | packet_put_int(c->local_window_max); |
1417 | packet_put_int(c->local_maxpacket); | |
1418 | } else { | |
1419 | packet_start(SSH_SMSG_AGENT_OPEN); | |
719fc62f | 1420 | packet_put_int(nc->self); |
fa08c86b | 1421 | } |
7368a6c8 | 1422 | packet_send(); |
1423 | } | |
1424 | } | |
5260325f | 1425 | |
ebb90778 | 1426 | /* ARGSUSED */ |
396c147e | 1427 | static void |
c8e9c167 | 1428 | channel_post_connecting(Channel *c, fd_set *readset, fd_set *writeset) |
97fb6912 | 1429 | { |
e07e21ad | 1430 | int err = 0, sock; |
8ab2cb35 | 1431 | socklen_t sz = sizeof(err); |
d18e0850 | 1432 | |
97fb6912 | 1433 | if (FD_ISSET(c->sock, writeset)) { |
db518d9b | 1434 | if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, &err, &sz) < 0) { |
d18e0850 | 1435 | err = errno; |
1436 | error("getsockopt SO_ERROR failed"); | |
1437 | } | |
1438 | if (err == 0) { | |
e07e21ad | 1439 | debug("channel %d: connected to %s port %d", |
1440 | c->self, c->connect_ctx.host, c->connect_ctx.port); | |
1441 | channel_connect_ctx_free(&c->connect_ctx); | |
d18e0850 | 1442 | c->type = SSH_CHANNEL_OPEN; |
1443 | if (compat20) { | |
1444 | packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1445 | packet_put_int(c->remote_id); | |
1446 | packet_put_int(c->self); | |
1447 | packet_put_int(c->local_window); | |
1448 | packet_put_int(c->local_maxpacket); | |
1449 | } else { | |
1450 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1451 | packet_put_int(c->remote_id); | |
1452 | packet_put_int(c->self); | |
1453 | } | |
97fb6912 | 1454 | } else { |
e07e21ad | 1455 | debug("channel %d: connection failed: %s", |
d18e0850 | 1456 | c->self, strerror(err)); |
e07e21ad | 1457 | /* Try next address, if any */ |
1458 | if ((sock = connect_next(&c->connect_ctx)) > 0) { | |
1459 | close(c->sock); | |
1460 | c->sock = c->rfd = c->wfd = sock; | |
1461 | channel_max_fd = channel_find_maxfd(); | |
1462 | return; | |
1463 | } | |
1464 | /* Exhausted all addresses */ | |
1465 | error("connect_to %.100s port %d: failed.", | |
1466 | c->connect_ctx.host, c->connect_ctx.port); | |
1467 | channel_connect_ctx_free(&c->connect_ctx); | |
d18e0850 | 1468 | if (compat20) { |
1469 | packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); | |
1470 | packet_put_int(c->remote_id); | |
1471 | packet_put_int(SSH2_OPEN_CONNECT_FAILED); | |
1472 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { | |
1473 | packet_put_cstring(strerror(err)); | |
1474 | packet_put_cstring(""); | |
1475 | } | |
97fb6912 | 1476 | } else { |
d18e0850 | 1477 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
1478 | packet_put_int(c->remote_id); | |
97fb6912 | 1479 | } |
d18e0850 | 1480 | chan_mark_dead(c); |
97fb6912 | 1481 | } |
d18e0850 | 1482 | packet_send(); |
97fb6912 | 1483 | } |
1484 | } | |
1485 | ||
ebb90778 | 1486 | /* ARGSUSED */ |
396c147e | 1487 | static int |
c8e9c167 | 1488 | channel_handle_rfd(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1489 | { |
fa1d7d85 | 1490 | char buf[CHAN_RBUF]; |
bd6a1355 | 1491 | int len, force; |
7368a6c8 | 1492 | |
bd6a1355 | 1493 | force = c->isatty && c->detach_close && c->istate != CHAN_INPUT_CLOSED; |
1494 | if (c->rfd != -1 && (force || FD_ISSET(c->rfd, readset))) { | |
ea8c44d9 | 1495 | errno = 0; |
7368a6c8 | 1496 | len = read(c->rfd, buf, sizeof(buf)); |
bd6a1355 | 1497 | if (len < 0 && (errno == EINTR || (errno == EAGAIN && !force))) |
0fbe8c74 | 1498 | return 1; |
ea8c44d9 | 1499 | #ifndef PTY_ZEROREAD |
7368a6c8 | 1500 | if (len <= 0) { |
ea8c44d9 | 1501 | #else |
9c04d67d | 1502 | if ((!c->isatty && len <= 0) || |
1503 | (c->isatty && (len < 0 || (len == 0 && errno != 0)))) { | |
ea8c44d9 | 1504 | #endif |
d7ac5f18 | 1505 | debug2("channel %d: read<=0 rfd %d len %d", |
7368a6c8 | 1506 | c->self, c->rfd, len); |
28b9cb4d | 1507 | if (c->type != SSH_CHANNEL_OPEN) { |
d7ac5f18 | 1508 | debug2("channel %d: not open", c->self); |
719fc62f | 1509 | chan_mark_dead(c); |
0490e609 | 1510 | return -1; |
28b9cb4d | 1511 | } else if (compat13) { |
9c50edcf | 1512 | buffer_clear(&c->output); |
7368a6c8 | 1513 | c->type = SSH_CHANNEL_INPUT_DRAINING; |
d7ac5f18 | 1514 | debug2("channel %d: input draining.", c->self); |
7368a6c8 | 1515 | } else { |
1516 | chan_read_failed(c); | |
5260325f | 1517 | } |
7368a6c8 | 1518 | return -1; |
1519 | } | |
6aacefa7 | 1520 | if (c->input_filter != NULL) { |
2e73a022 | 1521 | if (c->input_filter(c, buf, len) == -1) { |
d7ac5f18 | 1522 | debug2("channel %d: filter stops", c->self); |
2e73a022 | 1523 | chan_read_failed(c); |
1524 | } | |
d20f3c9e | 1525 | } else if (c->datagram) { |
1526 | buffer_put_string(&c->input, buf, len); | |
2e73a022 | 1527 | } else { |
1528 | buffer_append(&c->input, buf, len); | |
1529 | } | |
7368a6c8 | 1530 | } |
1531 | return 1; | |
1532 | } | |
a7137f6b | 1533 | |
ebb90778 | 1534 | /* ARGSUSED */ |
396c147e | 1535 | static int |
c8e9c167 | 1536 | channel_handle_wfd(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1537 | { |
95ce5599 | 1538 | struct termios tio; |
c1c6a032 | 1539 | u_char *data = NULL, *buf; |
780a9951 | 1540 | u_int dlen; |
7368a6c8 | 1541 | int len; |
1542 | ||
1543 | /* Send buffered output data to the socket. */ | |
6fd8622b | 1544 | if (c->wfd != -1 && |
7368a6c8 | 1545 | FD_ISSET(c->wfd, writeset) && |
1546 | buffer_len(&c->output) > 0) { | |
c1c6a032 | 1547 | if (c->output_filter != NULL) { |
1548 | if ((buf = c->output_filter(c, &data, &dlen)) == NULL) { | |
1549 | debug2("channel %d: filter stops", c->self); | |
d7b37427 | 1550 | if (c->type != SSH_CHANNEL_OPEN) |
1551 | chan_mark_dead(c); | |
1552 | else | |
1553 | chan_write_failed(c); | |
1554 | return -1; | |
c1c6a032 | 1555 | } |
1556 | } else if (c->datagram) { | |
1557 | buf = data = buffer_get_string(&c->output, &dlen); | |
1558 | } else { | |
1559 | buf = data = buffer_ptr(&c->output); | |
1560 | dlen = buffer_len(&c->output); | |
1561 | } | |
1562 | ||
d20f3c9e | 1563 | if (c->datagram) { |
d20f3c9e | 1564 | /* ignore truncated writes, datagrams might get lost */ |
1565 | c->local_consumed += dlen + 4; | |
c1c6a032 | 1566 | len = write(c->wfd, buf, dlen); |
d20f3c9e | 1567 | xfree(data); |
1568 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) | |
1569 | return 1; | |
1570 | if (len <= 0) { | |
1571 | if (c->type != SSH_CHANNEL_OPEN) | |
1572 | chan_mark_dead(c); | |
1573 | else | |
1574 | chan_write_failed(c); | |
1575 | return -1; | |
1576 | } | |
1577 | return 1; | |
1578 | } | |
64c0ce80 | 1579 | #ifdef _AIX |
aff51935 | 1580 | /* XXX: Later AIX versions can't push as much data to tty */ |
7fbb4189 | 1581 | if (compat20 && c->wfd_isatty) |
1582 | dlen = MIN(dlen, 8*1024); | |
64c0ce80 | 1583 | #endif |
c1c6a032 | 1584 | |
1585 | len = write(c->wfd, buf, dlen); | |
0fbe8c74 | 1586 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
1587 | return 1; | |
7368a6c8 | 1588 | if (len <= 0) { |
28b9cb4d | 1589 | if (c->type != SSH_CHANNEL_OPEN) { |
d7ac5f18 | 1590 | debug2("channel %d: not open", c->self); |
719fc62f | 1591 | chan_mark_dead(c); |
28b9cb4d | 1592 | return -1; |
1593 | } else if (compat13) { | |
9c50edcf | 1594 | buffer_clear(&c->output); |
d7ac5f18 | 1595 | debug2("channel %d: input draining.", c->self); |
7368a6c8 | 1596 | c->type = SSH_CHANNEL_INPUT_DRAINING; |
1597 | } else { | |
1598 | chan_write_failed(c); | |
5260325f | 1599 | } |
7368a6c8 | 1600 | return -1; |
1601 | } | |
c1c6a032 | 1602 | if (compat20 && c->isatty && dlen >= 1 && buf[0] != '\r') { |
0ae4fe1d | 1603 | if (tcgetattr(c->wfd, &tio) == 0 && |
1604 | !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) { | |
1605 | /* | |
1606 | * Simulate echo to reduce the impact of | |
355724fc | 1607 | * traffic analysis. We need to match the |
95ce5599 | 1608 | * size of a SSH2_MSG_CHANNEL_DATA message |
c1c6a032 | 1609 | * (4 byte channel id + buf) |
0ae4fe1d | 1610 | */ |
95ce5599 | 1611 | packet_send_ignore(4 + len); |
0ae4fe1d | 1612 | packet_send(); |
0ae4fe1d | 1613 | } |
1614 | } | |
7368a6c8 | 1615 | buffer_consume(&c->output, len); |
7e7327a1 | 1616 | if (compat20 && len > 0) { |
1617 | c->local_consumed += len; | |
1618 | } | |
1619 | } | |
1620 | return 1; | |
1621 | } | |
a7137f6b | 1622 | |
396c147e | 1623 | static int |
c8e9c167 | 1624 | channel_handle_efd(Channel *c, fd_set *readset, fd_set *writeset) |
7e7327a1 | 1625 | { |
fa1d7d85 | 1626 | char buf[CHAN_RBUF]; |
7e7327a1 | 1627 | int len; |
1628 | ||
8ce64345 | 1629 | /** XXX handle drain efd, too */ |
7e7327a1 | 1630 | if (c->efd != -1) { |
1631 | if (c->extended_usage == CHAN_EXTENDED_WRITE && | |
1632 | FD_ISSET(c->efd, writeset) && | |
1633 | buffer_len(&c->extended) > 0) { | |
1634 | len = write(c->efd, buffer_ptr(&c->extended), | |
1635 | buffer_len(&c->extended)); | |
de273eef | 1636 | debug2("channel %d: written %d to efd %d", |
7e7327a1 | 1637 | c->self, len, c->efd); |
ee55dacf | 1638 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
1639 | return 1; | |
1640 | if (len <= 0) { | |
1641 | debug2("channel %d: closing write-efd %d", | |
1642 | c->self, c->efd); | |
489aa2e9 | 1643 | channel_close_fd(&c->efd); |
ee55dacf | 1644 | } else { |
7e7327a1 | 1645 | buffer_consume(&c->extended, len); |
1646 | c->local_consumed += len; | |
1647 | } | |
1648 | } else if (c->extended_usage == CHAN_EXTENDED_READ && | |
34640ce6 | 1649 | (c->detach_close || FD_ISSET(c->efd, readset))) { |
7e7327a1 | 1650 | len = read(c->efd, buf, sizeof(buf)); |
de273eef | 1651 | debug2("channel %d: read %d from efd %d", |
184eed6a | 1652 | c->self, len, c->efd); |
34640ce6 | 1653 | if (len < 0 && (errno == EINTR || |
1654 | (errno == EAGAIN && !c->detach_close))) | |
ee55dacf | 1655 | return 1; |
1656 | if (len <= 0) { | |
1657 | debug2("channel %d: closing read-efd %d", | |
8ce64345 | 1658 | c->self, c->efd); |
489aa2e9 | 1659 | channel_close_fd(&c->efd); |
ee55dacf | 1660 | } else { |
7e7327a1 | 1661 | buffer_append(&c->extended, buf, len); |
ee55dacf | 1662 | } |
7e7327a1 | 1663 | } |
1664 | } | |
1665 | return 1; | |
1666 | } | |
a7137f6b | 1667 | |
ebb90778 | 1668 | /* ARGSUSED */ |
396c147e | 1669 | static int |
c8e9c167 | 1670 | channel_handle_ctl(Channel *c, fd_set *readset, fd_set *writeset) |
5e96b616 | 1671 | { |
1672 | char buf[16]; | |
1673 | int len; | |
1674 | ||
1675 | /* Monitor control fd to detect if the slave client exits */ | |
1676 | if (c->ctl_fd != -1 && FD_ISSET(c->ctl_fd, readset)) { | |
1677 | len = read(c->ctl_fd, buf, sizeof(buf)); | |
1678 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) | |
1679 | return 1; | |
1680 | if (len <= 0) { | |
1681 | debug2("channel %d: ctl read<=0", c->self); | |
1682 | if (c->type != SSH_CHANNEL_OPEN) { | |
1683 | debug2("channel %d: not open", c->self); | |
1684 | chan_mark_dead(c); | |
1685 | return -1; | |
1686 | } else { | |
1687 | chan_read_failed(c); | |
1688 | chan_write_failed(c); | |
1689 | } | |
1690 | return -1; | |
1691 | } else | |
1692 | fatal("%s: unexpected data on ctl fd", __func__); | |
1693 | } | |
1694 | return 1; | |
1695 | } | |
a7137f6b | 1696 | |
5e96b616 | 1697 | static int |
ee55dacf | 1698 | channel_check_window(Channel *c) |
7e7327a1 | 1699 | { |
28b9cb4d | 1700 | if (c->type == SSH_CHANNEL_OPEN && |
1701 | !(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) && | |
d9245683 | 1702 | ((c->local_window_max - c->local_window > |
68a73f53 | 1703 | c->local_maxpacket*3) || |
1704 | c->local_window < c->local_window_max/2) && | |
7e7327a1 | 1705 | c->local_consumed > 0) { |
1706 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); | |
1707 | packet_put_int(c->remote_id); | |
1708 | packet_put_int(c->local_consumed); | |
1709 | packet_send(); | |
de273eef | 1710 | debug2("channel %d: window %d sent adjust %d", |
7e7327a1 | 1711 | c->self, c->local_window, |
1712 | c->local_consumed); | |
1713 | c->local_window += c->local_consumed; | |
1714 | c->local_consumed = 0; | |
7368a6c8 | 1715 | } |
1716 | return 1; | |
1717 | } | |
5260325f | 1718 | |
396c147e | 1719 | static void |
c8e9c167 | 1720 | channel_post_open(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1721 | { |
639cb8ab | 1722 | if (c->delayed) |
1723 | return; | |
7368a6c8 | 1724 | channel_handle_rfd(c, readset, writeset); |
1725 | channel_handle_wfd(c, readset, writeset); | |
0c0738d5 | 1726 | if (!compat20) |
639cb8ab | 1727 | return; |
7e7327a1 | 1728 | channel_handle_efd(c, readset, writeset); |
5e96b616 | 1729 | channel_handle_ctl(c, readset, writeset); |
ee55dacf | 1730 | channel_check_window(c); |
7e7327a1 | 1731 | } |
1732 | ||
ebb90778 | 1733 | /* ARGSUSED */ |
396c147e | 1734 | static void |
c8e9c167 | 1735 | channel_post_output_drain_13(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1736 | { |
1737 | int len; | |
e1feb9bf | 1738 | |
7368a6c8 | 1739 | /* Send buffered output data to the socket. */ |
1740 | if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) { | |
1741 | len = write(c->sock, buffer_ptr(&c->output), | |
1742 | buffer_len(&c->output)); | |
1743 | if (len <= 0) | |
9c50edcf | 1744 | buffer_clear(&c->output); |
7368a6c8 | 1745 | else |
1746 | buffer_consume(&c->output, len); | |
1747 | } | |
1748 | } | |
5260325f | 1749 | |
396c147e | 1750 | static void |
7e7327a1 | 1751 | channel_handler_init_20(void) |
1752 | { | |
0c0738d5 | 1753 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open; |
0b242b12 | 1754 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
7e7327a1 | 1755 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; |
fa08c86b | 1756 | channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener; |
0b242b12 | 1757 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
fa08c86b | 1758 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; |
97fb6912 | 1759 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1760 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7e7327a1 | 1761 | |
0c0738d5 | 1762 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
7e7327a1 | 1763 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; |
fa08c86b | 1764 | channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener; |
0b242b12 | 1765 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
fa08c86b | 1766 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; |
97fb6912 | 1767 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 1768 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
7e7327a1 | 1769 | } |
1770 | ||
396c147e | 1771 | static void |
7368a6c8 | 1772 | channel_handler_init_13(void) |
1773 | { | |
1774 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13; | |
1775 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_13; | |
1776 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; | |
1777 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; | |
1778 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; | |
1779 | channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining; | |
1780 | channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining; | |
97fb6912 | 1781 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1782 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7368a6c8 | 1783 | |
0c0738d5 | 1784 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
7368a6c8 | 1785 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
1786 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; | |
1787 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; | |
1788 | channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13; | |
97fb6912 | 1789 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 1790 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
7368a6c8 | 1791 | } |
5260325f | 1792 | |
396c147e | 1793 | static void |
7368a6c8 | 1794 | channel_handler_init_15(void) |
1795 | { | |
0c0738d5 | 1796 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open; |
0b242b12 | 1797 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
7368a6c8 | 1798 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
1799 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; | |
1800 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; | |
97fb6912 | 1801 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1802 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7368a6c8 | 1803 | |
1804 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; | |
1805 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; | |
1806 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; | |
0c0738d5 | 1807 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
97fb6912 | 1808 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 1809 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
7368a6c8 | 1810 | } |
1811 | ||
396c147e | 1812 | static void |
7368a6c8 | 1813 | channel_handler_init(void) |
1814 | { | |
1815 | int i; | |
e1feb9bf | 1816 | |
184eed6a | 1817 | for (i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) { |
7368a6c8 | 1818 | channel_pre[i] = NULL; |
1819 | channel_post[i] = NULL; | |
1820 | } | |
7e7327a1 | 1821 | if (compat20) |
1822 | channel_handler_init_20(); | |
1823 | else if (compat13) | |
7368a6c8 | 1824 | channel_handler_init_13(); |
1825 | else | |
1826 | channel_handler_init_15(); | |
1827 | } | |
1828 | ||
418e724c | 1829 | /* gc dead channels */ |
1830 | static void | |
1831 | channel_garbage_collect(Channel *c) | |
1832 | { | |
1833 | if (c == NULL) | |
1834 | return; | |
1835 | if (c->detach_user != NULL) { | |
8cd0437d | 1836 | if (!chan_is_dead(c, c->detach_close)) |
418e724c | 1837 | return; |
d7ac5f18 | 1838 | debug2("channel %d: gc: notify user", c->self); |
418e724c | 1839 | c->detach_user(c->self, NULL); |
1840 | /* if we still have a callback */ | |
1841 | if (c->detach_user != NULL) | |
1842 | return; | |
d7ac5f18 | 1843 | debug2("channel %d: gc: user detached", c->self); |
418e724c | 1844 | } |
1845 | if (!chan_is_dead(c, 1)) | |
1846 | return; | |
d7ac5f18 | 1847 | debug2("channel %d: garbage collecting", c->self); |
418e724c | 1848 | channel_free(c); |
1849 | } | |
1850 | ||
396c147e | 1851 | static void |
c8e9c167 | 1852 | channel_handler(chan_fn *ftab[], fd_set *readset, fd_set *writeset) |
7368a6c8 | 1853 | { |
1854 | static int did_init = 0; | |
9a995072 | 1855 | u_int i; |
7368a6c8 | 1856 | Channel *c; |
1857 | ||
1858 | if (!did_init) { | |
1859 | channel_handler_init(); | |
1860 | did_init = 1; | |
1861 | } | |
1862 | for (i = 0; i < channels_alloc; i++) { | |
719fc62f | 1863 | c = channels[i]; |
1864 | if (c == NULL) | |
5260325f | 1865 | continue; |
6fd8622b | 1866 | if (ftab[c->type] != NULL) |
1867 | (*ftab[c->type])(c, readset, writeset); | |
418e724c | 1868 | channel_garbage_collect(c); |
8efc0c15 | 1869 | } |
8efc0c15 | 1870 | } |
1871 | ||
8e7895b8 | 1872 | /* |
1873 | * Allocate/update select bitmasks and add any bits relevant to channels in | |
1874 | * select bitmasks. | |
1875 | */ | |
6ae2364d | 1876 | void |
c422989b | 1877 | channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp, |
9a995072 | 1878 | u_int *nallocp, int rekeying) |
7368a6c8 | 1879 | { |
c5d10563 | 1880 | u_int n, sz, nfdset; |
39929cdb | 1881 | |
1882 | n = MAX(*maxfdp, channel_max_fd); | |
1883 | ||
c5d10563 | 1884 | nfdset = howmany(n+1, NFDBITS); |
1885 | /* Explicitly test here, because xrealloc isn't always called */ | |
1886 | if (nfdset && SIZE_T_MAX / nfdset < sizeof(fd_mask)) | |
1887 | fatal("channel_prepare_select: max_fd (%d) is too large", n); | |
1888 | sz = nfdset * sizeof(fd_mask); | |
1889 | ||
489aa2e9 | 1890 | /* perhaps check sz < nalloc/2 and shrink? */ |
1891 | if (*readsetp == NULL || sz > *nallocp) { | |
c5d10563 | 1892 | *readsetp = xrealloc(*readsetp, nfdset, sizeof(fd_mask)); |
1893 | *writesetp = xrealloc(*writesetp, nfdset, sizeof(fd_mask)); | |
489aa2e9 | 1894 | *nallocp = sz; |
39929cdb | 1895 | } |
489aa2e9 | 1896 | *maxfdp = n; |
39929cdb | 1897 | memset(*readsetp, 0, sz); |
1898 | memset(*writesetp, 0, sz); | |
1899 | ||
c422989b | 1900 | if (!rekeying) |
1901 | channel_handler(channel_pre, *readsetp, *writesetp); | |
7368a6c8 | 1902 | } |
1903 | ||
8e7895b8 | 1904 | /* |
1905 | * After select, perform any appropriate operations for channels which have | |
1906 | * events pending. | |
1907 | */ | |
6ae2364d | 1908 | void |
c8e9c167 | 1909 | channel_after_select(fd_set *readset, fd_set *writeset) |
7368a6c8 | 1910 | { |
1911 | channel_handler(channel_post, readset, writeset); | |
1912 | } | |
1913 | ||
8e7895b8 | 1914 | |
39929cdb | 1915 | /* If there is data to send to the connection, enqueue some of it now. */ |
6ae2364d | 1916 | void |
d5bb9418 | 1917 | channel_output_poll(void) |
8efc0c15 | 1918 | { |
7368a6c8 | 1919 | Channel *c; |
9a995072 | 1920 | u_int i, len; |
5260325f | 1921 | |
1922 | for (i = 0; i < channels_alloc; i++) { | |
719fc62f | 1923 | c = channels[i]; |
1924 | if (c == NULL) | |
1925 | continue; | |
48e671d5 | 1926 | |
8e7895b8 | 1927 | /* |
1928 | * We are only interested in channels that can have buffered | |
1929 | * incoming data. | |
1930 | */ | |
48e671d5 | 1931 | if (compat13) { |
7368a6c8 | 1932 | if (c->type != SSH_CHANNEL_OPEN && |
1933 | c->type != SSH_CHANNEL_INPUT_DRAINING) | |
48e671d5 | 1934 | continue; |
1935 | } else { | |
7368a6c8 | 1936 | if (c->type != SSH_CHANNEL_OPEN) |
48e671d5 | 1937 | continue; |
48e671d5 | 1938 | } |
e78a59f5 | 1939 | if (compat20 && |
1940 | (c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) { | |
ee55dacf | 1941 | /* XXX is this true? */ |
418e724c | 1942 | debug3("channel %d: will not send data after close", c->self); |
7e7327a1 | 1943 | continue; |
1944 | } | |
5260325f | 1945 | |
1946 | /* Get the amount of buffered data for this channel. */ | |
ee55dacf | 1947 | if ((c->istate == CHAN_INPUT_OPEN || |
1948 | c->istate == CHAN_INPUT_WAIT_DRAIN) && | |
1949 | (len = buffer_len(&c->input)) > 0) { | |
d20f3c9e | 1950 | if (c->datagram) { |
1951 | if (len > 0) { | |
1952 | u_char *data; | |
1953 | u_int dlen; | |
1954 | ||
1955 | data = buffer_get_string(&c->input, | |
1956 | &dlen); | |
1957 | packet_start(SSH2_MSG_CHANNEL_DATA); | |
1958 | packet_put_int(c->remote_id); | |
1959 | packet_put_string(data, dlen); | |
1960 | packet_send(); | |
1961 | c->remote_window -= dlen + 4; | |
1962 | xfree(data); | |
1963 | } | |
1964 | continue; | |
1965 | } | |
8e7895b8 | 1966 | /* |
1967 | * Send some data for the other side over the secure | |
1968 | * connection. | |
1969 | */ | |
7e7327a1 | 1970 | if (compat20) { |
1971 | if (len > c->remote_window) | |
1972 | len = c->remote_window; | |
1973 | if (len > c->remote_maxpacket) | |
1974 | len = c->remote_maxpacket; | |
5260325f | 1975 | } else { |
7e7327a1 | 1976 | if (packet_is_interactive()) { |
1977 | if (len > 1024) | |
1978 | len = 512; | |
1979 | } else { | |
1980 | /* Keep the packets at reasonable size. */ | |
1981 | if (len > packet_get_maxsize()/2) | |
1982 | len = packet_get_maxsize()/2; | |
1983 | } | |
5260325f | 1984 | } |
7368a6c8 | 1985 | if (len > 0) { |
7e7327a1 | 1986 | packet_start(compat20 ? |
1987 | SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA); | |
7368a6c8 | 1988 | packet_put_int(c->remote_id); |
1989 | packet_put_string(buffer_ptr(&c->input), len); | |
1990 | packet_send(); | |
1991 | buffer_consume(&c->input, len); | |
1992 | c->remote_window -= len; | |
7368a6c8 | 1993 | } |
1994 | } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) { | |
5260325f | 1995 | if (compat13) |
1996 | fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3"); | |
aa3378df | 1997 | /* |
1998 | * input-buffer is empty and read-socket shutdown: | |
d2296ed7 | 1999 | * tell peer, that we will not send more data: send IEOF. |
2000 | * hack for extended data: delay EOF if EFD still in use. | |
aa3378df | 2001 | */ |
d2296ed7 | 2002 | if (CHANNEL_EFD_INPUT_ACTIVE(c)) |
4e2e5cfd | 2003 | debug2("channel %d: ibuf_empty delayed efd %d/(%d)", |
2004 | c->self, c->efd, buffer_len(&c->extended)); | |
d2296ed7 | 2005 | else |
2006 | chan_ibuf_empty(c); | |
5260325f | 2007 | } |
7e7327a1 | 2008 | /* Send extended data, i.e. stderr */ |
2009 | if (compat20 && | |
d2296ed7 | 2010 | !(c->flags & CHAN_EOF_SENT) && |
7e7327a1 | 2011 | c->remote_window > 0 && |
2012 | (len = buffer_len(&c->extended)) > 0 && | |
2013 | c->extended_usage == CHAN_EXTENDED_READ) { | |
f91d9a89 | 2014 | debug2("channel %d: rwin %u elen %u euse %d", |
ee55dacf | 2015 | c->self, c->remote_window, buffer_len(&c->extended), |
2016 | c->extended_usage); | |
7e7327a1 | 2017 | if (len > c->remote_window) |
2018 | len = c->remote_window; | |
2019 | if (len > c->remote_maxpacket) | |
2020 | len = c->remote_maxpacket; | |
2021 | packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA); | |
2022 | packet_put_int(c->remote_id); | |
2023 | packet_put_int(SSH2_EXTENDED_DATA_STDERR); | |
2024 | packet_put_string(buffer_ptr(&c->extended), len); | |
2025 | packet_send(); | |
2026 | buffer_consume(&c->extended, len); | |
2027 | c->remote_window -= len; | |
ee55dacf | 2028 | debug2("channel %d: sent ext data %d", c->self, len); |
7e7327a1 | 2029 | } |
8efc0c15 | 2030 | } |
8efc0c15 | 2031 | } |
2032 | ||
8e7895b8 | 2033 | |
2034 | /* -- protocol input */ | |
04aa9e67 | 2035 | |
2036 | /* ARGSUSED */ | |
6ae2364d | 2037 | void |
7819b5c3 | 2038 | channel_input_data(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2039 | { |
48e671d5 | 2040 | int id; |
5260325f | 2041 | char *data; |
1e3b8b07 | 2042 | u_int data_len; |
7368a6c8 | 2043 | Channel *c; |
5260325f | 2044 | |
2045 | /* Get the channel number and verify it. */ | |
48e671d5 | 2046 | id = packet_get_int(); |
7368a6c8 | 2047 | c = channel_lookup(id); |
2048 | if (c == NULL) | |
48e671d5 | 2049 | packet_disconnect("Received data for nonexistent channel %d.", id); |
5260325f | 2050 | |
2051 | /* Ignore any data for non-open channels (might happen on close) */ | |
7368a6c8 | 2052 | if (c->type != SSH_CHANNEL_OPEN && |
2053 | c->type != SSH_CHANNEL_X11_OPEN) | |
48e671d5 | 2054 | return; |
2055 | ||
5260325f | 2056 | /* Get the data. */ |
17f02f0a | 2057 | data = packet_get_string_ptr(&data_len); |
7368a6c8 | 2058 | |
7741e239 | 2059 | /* |
2060 | * Ignore data for protocol > 1.3 if output end is no longer open. | |
2061 | * For protocol 2 the sending side is reducing its window as it sends | |
2062 | * data, so we must 'fake' consumption of the data in order to ensure | |
2063 | * that window updates are sent back. Otherwise the connection might | |
2064 | * deadlock. | |
2065 | */ | |
2066 | if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN) { | |
2067 | if (compat20) { | |
2068 | c->local_window -= data_len; | |
2069 | c->local_consumed += data_len; | |
2070 | } | |
7741e239 | 2071 | return; |
2072 | } | |
2073 | ||
6aacefa7 | 2074 | if (compat20) { |
7e7327a1 | 2075 | if (data_len > c->local_maxpacket) { |
bbe88b6d | 2076 | logit("channel %d: rcvd big packet %d, maxpack %d", |
7e7327a1 | 2077 | c->self, data_len, c->local_maxpacket); |
2078 | } | |
2079 | if (data_len > c->local_window) { | |
bbe88b6d | 2080 | logit("channel %d: rcvd too much data %d, win %d", |
7e7327a1 | 2081 | c->self, data_len, c->local_window); |
7e7327a1 | 2082 | return; |
2083 | } | |
2084 | c->local_window -= data_len; | |
7e7327a1 | 2085 | } |
d20f3c9e | 2086 | if (c->datagram) |
2087 | buffer_put_string(&c->output, data, data_len); | |
2088 | else | |
2089 | buffer_append(&c->output, data, data_len); | |
17f02f0a | 2090 | packet_check_eom(); |
8efc0c15 | 2091 | } |
8e7895b8 | 2092 | |
04aa9e67 | 2093 | /* ARGSUSED */ |
6ae2364d | 2094 | void |
7819b5c3 | 2095 | channel_input_extended_data(int type, u_int32_t seq, void *ctxt) |
7e7327a1 | 2096 | { |
2097 | int id; | |
7e7327a1 | 2098 | char *data; |
a594fa74 | 2099 | u_int data_len, tcode; |
7e7327a1 | 2100 | Channel *c; |
2101 | ||
2102 | /* Get the channel number and verify it. */ | |
2103 | id = packet_get_int(); | |
2104 | c = channel_lookup(id); | |
2105 | ||
2106 | if (c == NULL) | |
2107 | packet_disconnect("Received extended_data for bad channel %d.", id); | |
2108 | if (c->type != SSH_CHANNEL_OPEN) { | |
bbe88b6d | 2109 | logit("channel %d: ext data for non open", id); |
7e7327a1 | 2110 | return; |
2111 | } | |
d2296ed7 | 2112 | if (c->flags & CHAN_EOF_RCVD) { |
2113 | if (datafellows & SSH_BUG_EXTEOF) | |
2114 | debug("channel %d: accepting ext data after eof", id); | |
2115 | else | |
2116 | packet_disconnect("Received extended_data after EOF " | |
2117 | "on channel %d.", id); | |
2118 | } | |
7e7327a1 | 2119 | tcode = packet_get_int(); |
2120 | if (c->efd == -1 || | |
2121 | c->extended_usage != CHAN_EXTENDED_WRITE || | |
2122 | tcode != SSH2_EXTENDED_DATA_STDERR) { | |
bbe88b6d | 2123 | logit("channel %d: bad ext data", c->self); |
7e7327a1 | 2124 | return; |
2125 | } | |
2126 | data = packet_get_string(&data_len); | |
95500969 | 2127 | packet_check_eom(); |
7e7327a1 | 2128 | if (data_len > c->local_window) { |
bbe88b6d | 2129 | logit("channel %d: rcvd too much extended_data %d, win %d", |
7e7327a1 | 2130 | c->self, data_len, c->local_window); |
2131 | xfree(data); | |
2132 | return; | |
2133 | } | |
de273eef | 2134 | debug2("channel %d: rcvd ext data %d", c->self, data_len); |
7e7327a1 | 2135 | c->local_window -= data_len; |
2136 | buffer_append(&c->extended, data, data_len); | |
2137 | xfree(data); | |
2138 | } | |
2139 | ||
04aa9e67 | 2140 | /* ARGSUSED */ |
6ae2364d | 2141 | void |
7819b5c3 | 2142 | channel_input_ieof(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 2143 | { |
2144 | int id; | |
2145 | Channel *c; | |
2146 | ||
7368a6c8 | 2147 | id = packet_get_int(); |
95500969 | 2148 | packet_check_eom(); |
7368a6c8 | 2149 | c = channel_lookup(id); |
2150 | if (c == NULL) | |
2151 | packet_disconnect("Received ieof for nonexistent channel %d.", id); | |
2152 | chan_rcvd_ieof(c); | |
a5f82435 | 2153 | |
2154 | /* XXX force input close */ | |
8341f420 | 2155 | if (c->force_drain && c->istate == CHAN_INPUT_OPEN) { |
a5f82435 | 2156 | debug("channel %d: FORCE input drain", c->self); |
2157 | c->istate = CHAN_INPUT_WAIT_DRAIN; | |
32e7d71f | 2158 | if (buffer_len(&c->input) == 0) |
2159 | chan_ibuf_empty(c); | |
a5f82435 | 2160 | } |
2161 | ||
7368a6c8 | 2162 | } |
8efc0c15 | 2163 | |
04aa9e67 | 2164 | /* ARGSUSED */ |
6ae2364d | 2165 | void |
7819b5c3 | 2166 | channel_input_close(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2167 | { |
7368a6c8 | 2168 | int id; |
2169 | Channel *c; | |
5260325f | 2170 | |
7368a6c8 | 2171 | id = packet_get_int(); |
95500969 | 2172 | packet_check_eom(); |
7368a6c8 | 2173 | c = channel_lookup(id); |
2174 | if (c == NULL) | |
2175 | packet_disconnect("Received close for nonexistent channel %d.", id); | |
aa3378df | 2176 | |
2177 | /* | |
2178 | * Send a confirmation that we have closed the channel and no more | |
2179 | * data is coming for it. | |
2180 | */ | |
5260325f | 2181 | packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION); |
7368a6c8 | 2182 | packet_put_int(c->remote_id); |
5260325f | 2183 | packet_send(); |
2184 | ||
aa3378df | 2185 | /* |
2186 | * If the channel is in closed state, we have sent a close request, | |
2187 | * and the other side will eventually respond with a confirmation. | |
2188 | * Thus, we cannot free the channel here, because then there would be | |
2189 | * no-one to receive the confirmation. The channel gets freed when | |
2190 | * the confirmation arrives. | |
2191 | */ | |
7368a6c8 | 2192 | if (c->type != SSH_CHANNEL_CLOSED) { |
aa3378df | 2193 | /* |
2194 | * Not a closed channel - mark it as draining, which will | |
2195 | * cause it to be freed later. | |
2196 | */ | |
9c50edcf | 2197 | buffer_clear(&c->input); |
7368a6c8 | 2198 | c->type = SSH_CHANNEL_OUTPUT_DRAINING; |
5260325f | 2199 | } |
8efc0c15 | 2200 | } |
2201 | ||
7368a6c8 | 2202 | /* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */ |
04aa9e67 | 2203 | /* ARGSUSED */ |
6ae2364d | 2204 | void |
7819b5c3 | 2205 | channel_input_oclose(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2206 | { |
7368a6c8 | 2207 | int id = packet_get_int(); |
2208 | Channel *c = channel_lookup(id); | |
a8a21a53 | 2209 | |
95500969 | 2210 | packet_check_eom(); |
7368a6c8 | 2211 | if (c == NULL) |
2212 | packet_disconnect("Received oclose for nonexistent channel %d.", id); | |
2213 | chan_rcvd_oclose(c); | |
8efc0c15 | 2214 | } |
2215 | ||
04aa9e67 | 2216 | /* ARGSUSED */ |
6ae2364d | 2217 | void |
7819b5c3 | 2218 | channel_input_close_confirmation(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 2219 | { |
2220 | int id = packet_get_int(); | |
2221 | Channel *c = channel_lookup(id); | |
2222 | ||
95500969 | 2223 | packet_check_eom(); |
7368a6c8 | 2224 | if (c == NULL) |
2225 | packet_disconnect("Received close confirmation for " | |
2226 | "out-of-range channel %d.", id); | |
2227 | if (c->type != SSH_CHANNEL_CLOSED) | |
2228 | packet_disconnect("Received close confirmation for " | |
2229 | "non-closed channel %d (type %d).", id, c->type); | |
719fc62f | 2230 | channel_free(c); |
7368a6c8 | 2231 | } |
8efc0c15 | 2232 | |
04aa9e67 | 2233 | /* ARGSUSED */ |
6ae2364d | 2234 | void |
7819b5c3 | 2235 | channel_input_open_confirmation(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2236 | { |
7368a6c8 | 2237 | int id, remote_id; |
2238 | Channel *c; | |
5260325f | 2239 | |
7368a6c8 | 2240 | id = packet_get_int(); |
2241 | c = channel_lookup(id); | |
5260325f | 2242 | |
7368a6c8 | 2243 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) |
2244 | packet_disconnect("Received open confirmation for " | |
2245 | "non-opening channel %d.", id); | |
2246 | remote_id = packet_get_int(); | |
aa3378df | 2247 | /* Record the remote channel number and mark that the channel is now open. */ |
7368a6c8 | 2248 | c->remote_id = remote_id; |
2249 | c->type = SSH_CHANNEL_OPEN; | |
7e7327a1 | 2250 | |
2251 | if (compat20) { | |
2252 | c->remote_window = packet_get_int(); | |
2253 | c->remote_maxpacket = packet_get_int(); | |
3593bdc0 | 2254 | if (c->open_confirm) { |
de273eef | 2255 | debug2("callback start"); |
3593bdc0 | 2256 | c->open_confirm(c->self, c->open_confirm_ctx); |
de273eef | 2257 | debug2("callback done"); |
7e7327a1 | 2258 | } |
d7ac5f18 | 2259 | debug2("channel %d: open confirm rwindow %u rmax %u", c->self, |
7e7327a1 | 2260 | c->remote_window, c->remote_maxpacket); |
2261 | } | |
95500969 | 2262 | packet_check_eom(); |
8efc0c15 | 2263 | } |
2264 | ||
396c147e | 2265 | static char * |
d18e0850 | 2266 | reason2txt(int reason) |
2267 | { | |
6aacefa7 | 2268 | switch (reason) { |
d18e0850 | 2269 | case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED: |
2270 | return "administratively prohibited"; | |
2271 | case SSH2_OPEN_CONNECT_FAILED: | |
2272 | return "connect failed"; | |
2273 | case SSH2_OPEN_UNKNOWN_CHANNEL_TYPE: | |
2274 | return "unknown channel type"; | |
2275 | case SSH2_OPEN_RESOURCE_SHORTAGE: | |
2276 | return "resource shortage"; | |
2277 | } | |
7e8c18e9 | 2278 | return "unknown reason"; |
d18e0850 | 2279 | } |
2280 | ||
04aa9e67 | 2281 | /* ARGSUSED */ |
6ae2364d | 2282 | void |
7819b5c3 | 2283 | channel_input_open_failure(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2284 | { |
02a024dd | 2285 | int id, reason; |
2286 | char *msg = NULL, *lang = NULL; | |
7368a6c8 | 2287 | Channel *c; |
5260325f | 2288 | |
7368a6c8 | 2289 | id = packet_get_int(); |
2290 | c = channel_lookup(id); | |
2291 | ||
2292 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) | |
2293 | packet_disconnect("Received open failure for " | |
2294 | "non-opening channel %d.", id); | |
7e7327a1 | 2295 | if (compat20) { |
02a024dd | 2296 | reason = packet_get_int(); |
fbe90f7b | 2297 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { |
02a024dd | 2298 | msg = packet_get_string(NULL); |
2299 | lang = packet_get_string(NULL); | |
2300 | } | |
bbe88b6d | 2301 | logit("channel %d: open failed: %s%s%s", id, |
d18e0850 | 2302 | reason2txt(reason), msg ? ": ": "", msg ? msg : ""); |
02a024dd | 2303 | if (msg != NULL) |
2304 | xfree(msg); | |
2305 | if (lang != NULL) | |
2306 | xfree(lang); | |
7e7327a1 | 2307 | } |
95500969 | 2308 | packet_check_eom(); |
5260325f | 2309 | /* Free the channel. This will also close the socket. */ |
719fc62f | 2310 | channel_free(c); |
8efc0c15 | 2311 | } |
2312 | ||
04aa9e67 | 2313 | /* ARGSUSED */ |
8e7895b8 | 2314 | void |
7819b5c3 | 2315 | channel_input_window_adjust(int type, u_int32_t seq, void *ctxt) |
8e7895b8 | 2316 | { |
2317 | Channel *c; | |
f91d9a89 | 2318 | int id; |
2319 | u_int adjust; | |
3ffc6336 | 2320 | |
8e7895b8 | 2321 | if (!compat20) |
2322 | return; | |
8efc0c15 | 2323 | |
8e7895b8 | 2324 | /* Get the channel number and verify it. */ |
2325 | id = packet_get_int(); | |
2326 | c = channel_lookup(id); | |
2327 | ||
b872f7f0 | 2328 | if (c == NULL) { |
2329 | logit("Received window adjust for non-open channel %d.", id); | |
8e7895b8 | 2330 | return; |
2331 | } | |
2332 | adjust = packet_get_int(); | |
95500969 | 2333 | packet_check_eom(); |
f91d9a89 | 2334 | debug2("channel %d: rcvd adjust %u", id, adjust); |
8e7895b8 | 2335 | c->remote_window += adjust; |
2336 | } | |
2337 | ||
04aa9e67 | 2338 | /* ARGSUSED */ |
8e7895b8 | 2339 | void |
7819b5c3 | 2340 | channel_input_port_open(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2341 | { |
8e7895b8 | 2342 | Channel *c = NULL; |
2343 | u_short host_port; | |
2344 | char *host, *originator_string; | |
e07e21ad | 2345 | int remote_id; |
5260325f | 2346 | |
8e7895b8 | 2347 | remote_id = packet_get_int(); |
2348 | host = packet_get_string(NULL); | |
2349 | host_port = packet_get_int(); | |
2350 | ||
2351 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) { | |
2352 | originator_string = packet_get_string(NULL); | |
2353 | } else { | |
2354 | originator_string = xstrdup("unknown (remote did not supply name)"); | |
2355 | } | |
95500969 | 2356 | packet_check_eom(); |
e07e21ad | 2357 | c = channel_connect_to(host, host_port, |
2358 | "connected socket", originator_string); | |
0d942eff | 2359 | xfree(originator_string); |
e07e21ad | 2360 | xfree(host); |
8e7895b8 | 2361 | if (c == NULL) { |
2362 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
2363 | packet_put_int(remote_id); | |
2364 | packet_send(); | |
e07e21ad | 2365 | } else |
2366 | c->remote_id = remote_id; | |
8efc0c15 | 2367 | } |
2368 | ||
3593bdc0 | 2369 | /* ARGSUSED */ |
2370 | void | |
2371 | channel_input_status_confirm(int type, u_int32_t seq, void *ctxt) | |
2372 | { | |
2373 | Channel *c; | |
2374 | struct channel_confirm *cc; | |
2375 | int remote_id; | |
2376 | ||
2377 | /* Reset keepalive timeout */ | |
2378 | keep_alive_timeouts = 0; | |
2379 | ||
2380 | remote_id = packet_get_int(); | |
2381 | packet_check_eom(); | |
2382 | ||
2383 | debug2("channel_input_confirm: type %d id %d", type, remote_id); | |
2384 | ||
2385 | if ((c = channel_lookup(remote_id)) == NULL) { | |
2386 | logit("channel_input_success_failure: %d: unknown", remote_id); | |
2387 | return; | |
2388 | } | |
2389 | ; | |
2390 | if ((cc = TAILQ_FIRST(&c->status_confirms)) == NULL) | |
2391 | return; | |
2392 | cc->cb(type, c, cc->ctx); | |
2393 | TAILQ_REMOVE(&c->status_confirms, cc, entry); | |
2394 | bzero(cc, sizeof(*cc)); | |
2395 | xfree(cc); | |
2396 | } | |
8e7895b8 | 2397 | |
2398 | /* -- tcp forwarding */ | |
2399 | ||
5e4a7219 | 2400 | void |
2401 | channel_set_af(int af) | |
2402 | { | |
2403 | IPv4or6 = af; | |
2404 | } | |
2405 | ||
5641aefa | 2406 | static int |
2407 | channel_setup_fwd_listener(int type, const char *listen_addr, u_short listen_port, | |
2408 | const char *host_to_connect, u_short port_to_connect, int gateway_ports) | |
8efc0c15 | 2409 | { |
719fc62f | 2410 | Channel *c; |
442aee3a | 2411 | int sock, r, success = 0, wildcard = 0, is_client; |
48e671d5 | 2412 | struct addrinfo hints, *ai, *aitop; |
3867aa0a | 2413 | const char *host, *addr; |
5641aefa | 2414 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
5260325f | 2415 | |
5641aefa | 2416 | host = (type == SSH_CHANNEL_RPORT_LISTENER) ? |
2417 | listen_addr : host_to_connect; | |
3867aa0a | 2418 | is_client = (type == SSH_CHANNEL_PORT_LISTENER); |
02a024dd | 2419 | |
5641aefa | 2420 | if (host == NULL) { |
2421 | error("No forward host name."); | |
38946c65 | 2422 | return 0; |
fa08c86b | 2423 | } |
719fc62f | 2424 | if (strlen(host) > SSH_CHANNEL_PATH_LEN - 1) { |
02a024dd | 2425 | error("Forward host name too long."); |
38946c65 | 2426 | return 0; |
02a024dd | 2427 | } |
5260325f | 2428 | |
3867aa0a | 2429 | /* |
2430 | * Determine whether or not a port forward listens to loopback, | |
f8cc7664 | 2431 | * specified address or wildcard. On the client, a specified bind |
2432 | * address will always override gateway_ports. On the server, a | |
2433 | * gateway_ports of 1 (``yes'') will override the client's | |
2434 | * specification and force a wildcard bind, whereas a value of 2 | |
2435 | * (``clientspecified'') will bind to whatever address the client | |
3867aa0a | 2436 | * asked for. |
2437 | * | |
2438 | * Special-case listen_addrs are: | |
2439 | * | |
2440 | * "0.0.0.0" -> wildcard v4/v6 if SSH_OLD_FORWARD_ADDR | |
2441 | * "" (empty string), "*" -> wildcard v4/v6 | |
2442 | * "localhost" -> loopback v4/v6 | |
2443 | */ | |
2444 | addr = NULL; | |
2445 | if (listen_addr == NULL) { | |
2446 | /* No address specified: default to gateway_ports setting */ | |
2447 | if (gateway_ports) | |
2448 | wildcard = 1; | |
2449 | } else if (gateway_ports || is_client) { | |
2450 | if (((datafellows & SSH_OLD_FORWARD_ADDR) && | |
bc4cc956 | 2451 | strcmp(listen_addr, "0.0.0.0") == 0 && is_client == 0) || |
3867aa0a | 2452 | *listen_addr == '\0' || strcmp(listen_addr, "*") == 0 || |
2453 | (!is_client && gateway_ports == 1)) | |
2454 | wildcard = 1; | |
2455 | else if (strcmp(listen_addr, "localhost") != 0) | |
2456 | addr = listen_addr; | |
2457 | } | |
2458 | ||
2459 | debug3("channel_setup_fwd_listener: type %d wildcard %d addr %s", | |
2460 | type, wildcard, (addr == NULL) ? "NULL" : addr); | |
2461 | ||
aa3378df | 2462 | /* |
48e671d5 | 2463 | * getaddrinfo returns a loopback address if the hostname is |
2464 | * set to NULL and hints.ai_flags is not AI_PASSIVE | |
aa3378df | 2465 | */ |
48e671d5 | 2466 | memset(&hints, 0, sizeof(hints)); |
2467 | hints.ai_family = IPv4or6; | |
3867aa0a | 2468 | hints.ai_flags = wildcard ? AI_PASSIVE : 0; |
48e671d5 | 2469 | hints.ai_socktype = SOCK_STREAM; |
fa08c86b | 2470 | snprintf(strport, sizeof strport, "%d", listen_port); |
3867aa0a | 2471 | if ((r = getaddrinfo(addr, strport, &hints, &aitop)) != 0) { |
2472 | if (addr == NULL) { | |
2473 | /* This really shouldn't happen */ | |
2474 | packet_disconnect("getaddrinfo: fatal error: %s", | |
bb4626fe | 2475 | ssh_gai_strerror(r)); |
3867aa0a | 2476 | } else { |
38946c65 | 2477 | error("channel_setup_fwd_listener: " |
bb4626fe | 2478 | "getaddrinfo(%.64s): %s", addr, |
2479 | ssh_gai_strerror(r)); | |
3867aa0a | 2480 | } |
38946c65 | 2481 | return 0; |
3867aa0a | 2482 | } |
48e671d5 | 2483 | |
48e671d5 | 2484 | for (ai = aitop; ai; ai = ai->ai_next) { |
2485 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
2486 | continue; | |
2487 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), | |
2488 | strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { | |
5641aefa | 2489 | error("channel_setup_fwd_listener: getnameinfo failed"); |
48e671d5 | 2490 | continue; |
2491 | } | |
2492 | /* Create a port to listen for the host. */ | |
3e131a6d | 2493 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
48e671d5 | 2494 | if (sock < 0) { |
2495 | /* this is no error since kernel may not support ipv6 */ | |
2496 | verbose("socket: %.100s", strerror(errno)); | |
2497 | continue; | |
2498 | } | |
442aee3a | 2499 | |
2500 | channel_set_reuseaddr(sock); | |
facfd613 | 2501 | |
48e671d5 | 2502 | debug("Local forwarding listening on %s port %s.", ntop, strport); |
2503 | ||
2504 | /* Bind the socket to the address. */ | |
2505 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { | |
2506 | /* address can be in use ipv6 address is already bound */ | |
16218745 | 2507 | if (!ai->ai_next) |
2508 | error("bind: %.100s", strerror(errno)); | |
2509 | else | |
2510 | verbose("bind: %.100s", strerror(errno)); | |
2b87da3b | 2511 | |
48e671d5 | 2512 | close(sock); |
2513 | continue; | |
2514 | } | |
2515 | /* Start listening for connections on the socket. */ | |
fce39749 | 2516 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { |
48e671d5 | 2517 | error("listen: %.100s", strerror(errno)); |
2518 | close(sock); | |
2519 | continue; | |
2520 | } | |
2521 | /* Allocate a channel number for the socket. */ | |
8e7895b8 | 2522 | c = channel_new("port listener", type, sock, sock, -1, |
0b242b12 | 2523 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, |
0d942eff | 2524 | 0, "port listener", 1); |
719fc62f | 2525 | strlcpy(c->path, host, sizeof(c->path)); |
2526 | c->host_port = port_to_connect; | |
2527 | c->listening_port = listen_port; | |
48e671d5 | 2528 | success = 1; |
2529 | } | |
2530 | if (success == 0) | |
5641aefa | 2531 | error("channel_setup_fwd_listener: cannot listen to port: %d", |
02a024dd | 2532 | listen_port); |
48e671d5 | 2533 | freeaddrinfo(aitop); |
02a024dd | 2534 | return success; |
5260325f | 2535 | } |
8efc0c15 | 2536 | |
d740ec16 | 2537 | int |
2538 | channel_cancel_rport_listener(const char *host, u_short port) | |
2539 | { | |
9a995072 | 2540 | u_int i; |
2541 | int found = 0; | |
d740ec16 | 2542 | |
f8cc7664 | 2543 | for (i = 0; i < channels_alloc; i++) { |
d740ec16 | 2544 | Channel *c = channels[i]; |
2545 | ||
2546 | if (c != NULL && c->type == SSH_CHANNEL_RPORT_LISTENER && | |
2547 | strncmp(c->path, host, sizeof(c->path)) == 0 && | |
f2107e97 | 2548 | c->listening_port == port) { |
2912cbd6 | 2549 | debug2("%s: close channel %d", __func__, i); |
d740ec16 | 2550 | channel_free(c); |
2551 | found = 1; | |
2552 | } | |
2553 | } | |
2554 | ||
2555 | return (found); | |
2556 | } | |
2557 | ||
5641aefa | 2558 | /* protocol local port fwd, used by ssh (and sshd in v1) */ |
2559 | int | |
3867aa0a | 2560 | channel_setup_local_fwd_listener(const char *listen_host, u_short listen_port, |
5641aefa | 2561 | const char *host_to_connect, u_short port_to_connect, int gateway_ports) |
2562 | { | |
2563 | return channel_setup_fwd_listener(SSH_CHANNEL_PORT_LISTENER, | |
3867aa0a | 2564 | listen_host, listen_port, host_to_connect, port_to_connect, |
2565 | gateway_ports); | |
5641aefa | 2566 | } |
2567 | ||
2568 | /* protocol v2 remote port fwd, used by sshd */ | |
2569 | int | |
2570 | channel_setup_remote_fwd_listener(const char *listen_address, | |
2571 | u_short listen_port, int gateway_ports) | |
2572 | { | |
2573 | return channel_setup_fwd_listener(SSH_CHANNEL_RPORT_LISTENER, | |
2574 | listen_address, listen_port, NULL, 0, gateway_ports); | |
2575 | } | |
2576 | ||
aa3378df | 2577 | /* |
2578 | * Initiate forwarding of connections to port "port" on remote host through | |
2579 | * the secure channel to host:port from local side. | |
2580 | */ | |
8efc0c15 | 2581 | |
42ea6f5e | 2582 | int |
3867aa0a | 2583 | channel_request_remote_forwarding(const char *listen_host, u_short listen_port, |
fa08c86b | 2584 | const char *host_to_connect, u_short port_to_connect) |
8efc0c15 | 2585 | { |
54a5250f | 2586 | int type, success = 0; |
fa08c86b | 2587 | |
5260325f | 2588 | /* Record locally that connection to this host/port is permitted. */ |
2589 | if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
2590 | fatal("channel_request_remote_forwarding: too many forwards"); | |
2591 | ||
5260325f | 2592 | /* Send the forward request to the remote side. */ |
7e7327a1 | 2593 | if (compat20) { |
3867aa0a | 2594 | const char *address_to_bind; |
04efe9b0 | 2595 | if (listen_host == NULL) { |
2596 | if (datafellows & SSH_BUG_RFWD_ADDR) | |
2597 | address_to_bind = "127.0.0.1"; | |
2598 | else | |
2599 | address_to_bind = "localhost"; | |
2600 | } else if (*listen_host == '\0' || | |
2601 | strcmp(listen_host, "*") == 0) { | |
2602 | if (datafellows & SSH_BUG_RFWD_ADDR) | |
2603 | address_to_bind = "0.0.0.0"; | |
2604 | else | |
2605 | address_to_bind = ""; | |
2606 | } else | |
3867aa0a | 2607 | address_to_bind = listen_host; |
2608 | ||
7e7327a1 | 2609 | packet_start(SSH2_MSG_GLOBAL_REQUEST); |
2610 | packet_put_cstring("tcpip-forward"); | |
e0ae8728 | 2611 | packet_put_char(1); /* boolean: want reply */ |
7e7327a1 | 2612 | packet_put_cstring(address_to_bind); |
2613 | packet_put_int(listen_port); | |
fa08c86b | 2614 | packet_send(); |
2615 | packet_write_wait(); | |
2616 | /* Assume that server accepts the request */ | |
2617 | success = 1; | |
7e7327a1 | 2618 | } else { |
2619 | packet_start(SSH_CMSG_PORT_FORWARD_REQUEST); | |
7e7327a1 | 2620 | packet_put_int(listen_port); |
d6f24e45 | 2621 | packet_put_cstring(host_to_connect); |
2622 | packet_put_int(port_to_connect); | |
7e7327a1 | 2623 | packet_send(); |
2624 | packet_write_wait(); | |
fa08c86b | 2625 | |
2626 | /* Wait for response from the remote side. */ | |
54a5250f | 2627 | type = packet_read(); |
fa08c86b | 2628 | switch (type) { |
2629 | case SSH_SMSG_SUCCESS: | |
2630 | success = 1; | |
2631 | break; | |
2632 | case SSH_SMSG_FAILURE: | |
fa08c86b | 2633 | break; |
2634 | default: | |
2635 | /* Unknown packet */ | |
2636 | packet_disconnect("Protocol error for port forward request:" | |
2637 | "received packet type %d.", type); | |
2638 | } | |
2639 | } | |
2640 | if (success) { | |
2641 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host_to_connect); | |
2642 | permitted_opens[num_permitted_opens].port_to_connect = port_to_connect; | |
2643 | permitted_opens[num_permitted_opens].listen_port = listen_port; | |
2644 | num_permitted_opens++; | |
7e7327a1 | 2645 | } |
42ea6f5e | 2646 | return (success ? 0 : -1); |
8efc0c15 | 2647 | } |
2648 | ||
d740ec16 | 2649 | /* |
f2107e97 | 2650 | * Request cancellation of remote forwarding of connection host:port from |
d740ec16 | 2651 | * local side. |
2652 | */ | |
d740ec16 | 2653 | void |
3867aa0a | 2654 | channel_request_rforward_cancel(const char *host, u_short port) |
d740ec16 | 2655 | { |
2656 | int i; | |
d740ec16 | 2657 | |
2658 | if (!compat20) | |
2659 | return; | |
2660 | ||
2661 | for (i = 0; i < num_permitted_opens; i++) { | |
f2107e97 | 2662 | if (permitted_opens[i].host_to_connect != NULL && |
d740ec16 | 2663 | permitted_opens[i].listen_port == port) |
2664 | break; | |
2665 | } | |
2666 | if (i >= num_permitted_opens) { | |
2667 | debug("%s: requested forward not found", __func__); | |
2668 | return; | |
2669 | } | |
2670 | packet_start(SSH2_MSG_GLOBAL_REQUEST); | |
2671 | packet_put_cstring("cancel-tcpip-forward"); | |
2672 | packet_put_char(0); | |
3867aa0a | 2673 | packet_put_cstring(host == NULL ? "" : host); |
d740ec16 | 2674 | packet_put_int(port); |
2675 | packet_send(); | |
2676 | ||
2677 | permitted_opens[i].listen_port = 0; | |
2678 | permitted_opens[i].port_to_connect = 0; | |
8c4bd764 | 2679 | xfree(permitted_opens[i].host_to_connect); |
d740ec16 | 2680 | permitted_opens[i].host_to_connect = NULL; |
2681 | } | |
2682 | ||
aa3378df | 2683 | /* |
2684 | * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates | |
2685 | * listening for the port, and sends back a success reply (or disconnect | |
42ea6f5e | 2686 | * message if there was an error). |
aa3378df | 2687 | */ |
42ea6f5e | 2688 | int |
1d1ffb87 | 2689 | channel_input_port_forward_request(int is_root, int gateway_ports) |
8efc0c15 | 2690 | { |
57112b5a | 2691 | u_short port, host_port; |
42ea6f5e | 2692 | int success = 0; |
5260325f | 2693 | char *hostname; |
2694 | ||
2695 | /* Get arguments from the packet. */ | |
2696 | port = packet_get_int(); | |
2697 | hostname = packet_get_string(NULL); | |
2698 | host_port = packet_get_int(); | |
2699 | ||
3c62e7eb | 2700 | #ifndef HAVE_CYGWIN |
aa3378df | 2701 | /* |
2702 | * Check that an unprivileged user is not trying to forward a | |
2703 | * privileged port. | |
2704 | */ | |
5260325f | 2705 | if (port < IPPORT_RESERVED && !is_root) |
8e7c9afc | 2706 | packet_disconnect( |
2707 | "Requested forwarding of port %d but user is not root.", | |
2708 | port); | |
2709 | if (host_port == 0) | |
2710 | packet_disconnect("Dynamic forwarding denied."); | |
3c62e7eb | 2711 | #endif |
8e7c9afc | 2712 | |
fa08c86b | 2713 | /* Initiate forwarding */ |
42ea6f5e | 2714 | success = channel_setup_local_fwd_listener(NULL, port, hostname, |
3867aa0a | 2715 | host_port, gateway_ports); |
5260325f | 2716 | |
2717 | /* Free the argument string. */ | |
2718 | xfree(hostname); | |
42ea6f5e | 2719 | |
2720 | return (success ? 0 : -1); | |
8efc0c15 | 2721 | } |
2722 | ||
01794848 | 2723 | /* |
2724 | * Permits opening to any host/port if permitted_opens[] is empty. This is | |
2725 | * usually called by the server, because the user could connect to any port | |
2726 | * anyway, and the server has no way to know but to trust the client anyway. | |
2727 | */ | |
2728 | void | |
d5bb9418 | 2729 | channel_permit_all_opens(void) |
01794848 | 2730 | { |
2731 | if (num_permitted_opens == 0) | |
2732 | all_opens_permitted = 1; | |
2733 | } | |
2734 | ||
cd332296 | 2735 | void |
01794848 | 2736 | channel_add_permitted_opens(char *host, int port) |
2737 | { | |
2738 | if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
42ea6f5e | 2739 | fatal("channel_add_permitted_opens: too many forwards"); |
01794848 | 2740 | debug("allow port forwarding to host %s port %d", host, port); |
2741 | ||
2742 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host); | |
2743 | permitted_opens[num_permitted_opens].port_to_connect = port; | |
2744 | num_permitted_opens++; | |
2745 | ||
2746 | all_opens_permitted = 0; | |
2747 | } | |
2748 | ||
ea46e550 | 2749 | int |
2fefbadf | 2750 | channel_add_adm_permitted_opens(char *host, int port) |
2751 | { | |
2752 | if (num_adm_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
2753 | fatal("channel_add_adm_permitted_opens: too many forwards"); | |
ea46e550 | 2754 | debug("config allows port forwarding to host %s port %d", host, port); |
2fefbadf | 2755 | |
2756 | permitted_adm_opens[num_adm_permitted_opens].host_to_connect | |
2757 | = xstrdup(host); | |
2758 | permitted_adm_opens[num_adm_permitted_opens].port_to_connect = port; | |
ea46e550 | 2759 | return ++num_adm_permitted_opens; |
2fefbadf | 2760 | } |
2761 | ||
cd332296 | 2762 | void |
01794848 | 2763 | channel_clear_permitted_opens(void) |
2764 | { | |
2765 | int i; | |
2766 | ||
2767 | for (i = 0; i < num_permitted_opens; i++) | |
d740ec16 | 2768 | if (permitted_opens[i].host_to_connect != NULL) |
2769 | xfree(permitted_opens[i].host_to_connect); | |
01794848 | 2770 | num_permitted_opens = 0; |
2fefbadf | 2771 | } |
2772 | ||
2773 | void | |
2774 | channel_clear_adm_permitted_opens(void) | |
2775 | { | |
2776 | int i; | |
01794848 | 2777 | |
2fefbadf | 2778 | for (i = 0; i < num_adm_permitted_opens; i++) |
2779 | if (permitted_adm_opens[i].host_to_connect != NULL) | |
2780 | xfree(permitted_adm_opens[i].host_to_connect); | |
2781 | num_adm_permitted_opens = 0; | |
01794848 | 2782 | } |
2783 | ||
1760c982 | 2784 | void |
2785 | channel_print_adm_permitted_opens(void) | |
2786 | { | |
2787 | static int i; | |
2788 | ||
2789 | for (i = 0; i < num_adm_permitted_opens; i++) | |
2790 | if (permitted_adm_opens[i].host_to_connect != NULL) | |
2791 | printf(" %s:%d", permitted_adm_opens[i].host_to_connect, | |
2792 | permitted_adm_opens[i].port_to_connect); | |
2793 | } | |
2794 | ||
e07e21ad | 2795 | /* Try to start non-blocking connect to next host in cctx list */ |
396c147e | 2796 | static int |
e07e21ad | 2797 | connect_next(struct channel_connect *cctx) |
8efc0c15 | 2798 | { |
e07e21ad | 2799 | int sock, saved_errno; |
48e671d5 | 2800 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
48e671d5 | 2801 | |
e07e21ad | 2802 | for (; cctx->ai; cctx->ai = cctx->ai->ai_next) { |
2803 | if (cctx->ai->ai_family != AF_INET && | |
2804 | cctx->ai->ai_family != AF_INET6) | |
48e671d5 | 2805 | continue; |
e07e21ad | 2806 | if (getnameinfo(cctx->ai->ai_addr, cctx->ai->ai_addrlen, |
2807 | ntop, sizeof(ntop), strport, sizeof(strport), | |
2808 | NI_NUMERICHOST|NI_NUMERICSERV) != 0) { | |
2809 | error("connect_next: getnameinfo failed"); | |
48e671d5 | 2810 | continue; |
5260325f | 2811 | } |
e07e21ad | 2812 | if ((sock = socket(cctx->ai->ai_family, cctx->ai->ai_socktype, |
2813 | cctx->ai->ai_protocol)) == -1) { | |
2814 | if (cctx->ai->ai_next == NULL) | |
4940c411 | 2815 | error("socket: %.100s", strerror(errno)); |
2816 | else | |
2817 | verbose("socket: %.100s", strerror(errno)); | |
48e671d5 | 2818 | continue; |
5260325f | 2819 | } |
170694d7 | 2820 | if (set_nonblock(sock) == -1) |
2821 | fatal("%s: set_nonblock(%d)", __func__, sock); | |
e07e21ad | 2822 | if (connect(sock, cctx->ai->ai_addr, |
2823 | cctx->ai->ai_addrlen) == -1 && errno != EINPROGRESS) { | |
2824 | debug("connect_next: host %.100s ([%.100s]:%s): " | |
2825 | "%.100s", cctx->host, ntop, strport, | |
48e671d5 | 2826 | strerror(errno)); |
e07e21ad | 2827 | saved_errno = errno; |
48e671d5 | 2828 | close(sock); |
e07e21ad | 2829 | errno = saved_errno; |
2b87da3b | 2830 | continue; /* fail -- try next */ |
48e671d5 | 2831 | } |
e07e21ad | 2832 | debug("connect_next: host %.100s ([%.100s]:%s) " |
2833 | "in progress, fd=%d", cctx->host, ntop, strport, sock); | |
2834 | cctx->ai = cctx->ai->ai_next; | |
2835 | set_nodelay(sock); | |
2836 | return sock; | |
2837 | } | |
2838 | return -1; | |
2839 | } | |
2840 | ||
2841 | static void | |
2842 | channel_connect_ctx_free(struct channel_connect *cctx) | |
2843 | { | |
2844 | xfree(cctx->host); | |
2845 | if (cctx->aitop) | |
2846 | freeaddrinfo(cctx->aitop); | |
2847 | bzero(cctx, sizeof(*cctx)); | |
2848 | cctx->host = NULL; | |
2849 | cctx->ai = cctx->aitop = NULL; | |
2850 | } | |
2851 | ||
2852 | /* Return CONNECTING channel to remote host, port */ | |
2853 | static Channel * | |
2854 | connect_to(const char *host, u_short port, char *ctype, char *rname) | |
2855 | { | |
2856 | struct addrinfo hints; | |
2857 | int gaierr; | |
2858 | int sock = -1; | |
2859 | char strport[NI_MAXSERV]; | |
2860 | struct channel_connect cctx; | |
2861 | Channel *c; | |
5260325f | 2862 | |
e07e21ad | 2863 | memset(&hints, 0, sizeof(hints)); |
2864 | hints.ai_family = IPv4or6; | |
2865 | hints.ai_socktype = SOCK_STREAM; | |
2866 | snprintf(strport, sizeof strport, "%d", port); | |
2867 | if ((gaierr = getaddrinfo(host, strport, &hints, &cctx.aitop)) != 0) { | |
2868 | error("connect_to %.100s: unknown host (%s)", host, | |
2869 | ssh_gai_strerror(gaierr)); | |
2870 | return NULL; | |
5260325f | 2871 | } |
e07e21ad | 2872 | |
2873 | cctx.host = xstrdup(host); | |
2874 | cctx.port = port; | |
2875 | cctx.ai = cctx.aitop; | |
2876 | ||
2877 | if ((sock = connect_next(&cctx)) == -1) { | |
2878 | error("connect to %.100s port %d failed: %s", | |
2879 | host, port, strerror(errno)); | |
2880 | channel_connect_ctx_free(&cctx); | |
2881 | return NULL; | |
8efc0c15 | 2882 | } |
e07e21ad | 2883 | c = channel_new(ctype, SSH_CHANNEL_CONNECTING, sock, sock, -1, |
2884 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, rname, 1); | |
2885 | c->connect_ctx = cctx; | |
2886 | return c; | |
7368a6c8 | 2887 | } |
01794848 | 2888 | |
e07e21ad | 2889 | Channel * |
2890 | channel_connect_by_listen_address(u_short listen_port, char *ctype, char *rname) | |
fa08c86b | 2891 | { |
2892 | int i; | |
01794848 | 2893 | |
e07e21ad | 2894 | for (i = 0; i < num_permitted_opens; i++) { |
d740ec16 | 2895 | if (permitted_opens[i].host_to_connect != NULL && |
e07e21ad | 2896 | permitted_opens[i].listen_port == listen_port) { |
01794848 | 2897 | return connect_to( |
fa08c86b | 2898 | permitted_opens[i].host_to_connect, |
e07e21ad | 2899 | permitted_opens[i].port_to_connect, ctype, rname); |
2900 | } | |
2901 | } | |
0b6fbf03 | 2902 | error("WARNING: Server requests forwarding for unknown listen_port %d", |
2903 | listen_port); | |
e07e21ad | 2904 | return NULL; |
fa08c86b | 2905 | } |
48e671d5 | 2906 | |
01794848 | 2907 | /* Check if connecting to that port is permitted and connect. */ |
e07e21ad | 2908 | Channel * |
2909 | channel_connect_to(const char *host, u_short port, char *ctype, char *rname) | |
01794848 | 2910 | { |
2fefbadf | 2911 | int i, permit, permit_adm = 1; |
01794848 | 2912 | |
2913 | permit = all_opens_permitted; | |
2914 | if (!permit) { | |
2915 | for (i = 0; i < num_permitted_opens; i++) | |
d740ec16 | 2916 | if (permitted_opens[i].host_to_connect != NULL && |
2917 | permitted_opens[i].port_to_connect == port && | |
01794848 | 2918 | strcmp(permitted_opens[i].host_to_connect, host) == 0) |
2919 | permit = 1; | |
2fefbadf | 2920 | } |
01794848 | 2921 | |
2fefbadf | 2922 | if (num_adm_permitted_opens > 0) { |
2923 | permit_adm = 0; | |
2924 | for (i = 0; i < num_adm_permitted_opens; i++) | |
2925 | if (permitted_adm_opens[i].host_to_connect != NULL && | |
2926 | permitted_adm_opens[i].port_to_connect == port && | |
2927 | strcmp(permitted_adm_opens[i].host_to_connect, host) | |
2928 | == 0) | |
2929 | permit_adm = 1; | |
01794848 | 2930 | } |
2fefbadf | 2931 | |
2932 | if (!permit || !permit_adm) { | |
bbe88b6d | 2933 | logit("Received request to connect to host %.100s port %d, " |
01794848 | 2934 | "but the request was denied.", host, port); |
e07e21ad | 2935 | return NULL; |
01794848 | 2936 | } |
e07e21ad | 2937 | return connect_to(host, port, ctype, rname); |
01794848 | 2938 | } |
2939 | ||
5e96b616 | 2940 | void |
2941 | channel_send_window_changes(void) | |
2942 | { | |
9a995072 | 2943 | u_int i; |
5e96b616 | 2944 | struct winsize ws; |
2945 | ||
2946 | for (i = 0; i < channels_alloc; i++) { | |
f8cc7664 | 2947 | if (channels[i] == NULL || !channels[i]->client_tty || |
5e96b616 | 2948 | channels[i]->type != SSH_CHANNEL_OPEN) |
2949 | continue; | |
2950 | if (ioctl(channels[i]->rfd, TIOCGWINSZ, &ws) < 0) | |
2951 | continue; | |
2952 | channel_request_start(i, "window-change", 0); | |
148de80c | 2953 | packet_put_int((u_int)ws.ws_col); |
2954 | packet_put_int((u_int)ws.ws_row); | |
2955 | packet_put_int((u_int)ws.ws_xpixel); | |
2956 | packet_put_int((u_int)ws.ws_ypixel); | |
5e96b616 | 2957 | packet_send(); |
2958 | } | |
2959 | } | |
2960 | ||
8e7895b8 | 2961 | /* -- X11 forwarding */ |
8efc0c15 | 2962 | |
aa3378df | 2963 | /* |
2964 | * Creates an internet domain socket for listening for X11 connections. | |
57f228e8 | 2965 | * Returns 0 and a suitable display number for the DISPLAY variable |
2966 | * stored in display_numberp , or -1 if an error occurs. | |
aa3378df | 2967 | */ |
c9d0ad9b | 2968 | int |
e6e573bd | 2969 | x11_create_display_inet(int x11_display_offset, int x11_use_localhost, |
d08341e6 | 2970 | int single_connection, u_int *display_numberp, int **chanids) |
8efc0c15 | 2971 | { |
ac151b18 | 2972 | Channel *nc = NULL; |
57112b5a | 2973 | int display_number, sock; |
2974 | u_short port; | |
48e671d5 | 2975 | struct addrinfo hints, *ai, *aitop; |
2976 | char strport[NI_MAXSERV]; | |
2977 | int gaierr, n, num_socks = 0, socks[NUM_SOCKS]; | |
5260325f | 2978 | |
59e5aff5 | 2979 | if (chanids == NULL) |
2980 | return -1; | |
2981 | ||
95f1eccc | 2982 | for (display_number = x11_display_offset; |
184eed6a | 2983 | display_number < MAX_DISPLAYS; |
2984 | display_number++) { | |
5260325f | 2985 | port = 6000 + display_number; |
48e671d5 | 2986 | memset(&hints, 0, sizeof(hints)); |
2987 | hints.ai_family = IPv4or6; | |
e6e573bd | 2988 | hints.ai_flags = x11_use_localhost ? 0: AI_PASSIVE; |
48e671d5 | 2989 | hints.ai_socktype = SOCK_STREAM; |
2990 | snprintf(strport, sizeof strport, "%d", port); | |
2991 | if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) { | |
bb4626fe | 2992 | error("getaddrinfo: %.100s", ssh_gai_strerror(gaierr)); |
c9d0ad9b | 2993 | return -1; |
5260325f | 2994 | } |
48e671d5 | 2995 | for (ai = aitop; ai; ai = ai->ai_next) { |
2996 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
2997 | continue; | |
3e131a6d | 2998 | sock = socket(ai->ai_family, ai->ai_socktype, |
2999 | ai->ai_protocol); | |
48e671d5 | 3000 | if (sock < 0) { |
4ee81249 | 3001 | if ((errno != EINVAL) && (errno != EAFNOSUPPORT)) { |
80a44451 | 3002 | error("socket: %.100s", strerror(errno)); |
0ea89f7e | 3003 | freeaddrinfo(aitop); |
c9d0ad9b | 3004 | return -1; |
80a44451 | 3005 | } else { |
22d89d24 | 3006 | debug("x11_create_display_inet: Socket family %d not supported", |
3007 | ai->ai_family); | |
80a44451 | 3008 | continue; |
3009 | } | |
48e671d5 | 3010 | } |
688aaeda | 3011 | #ifdef IPV6_V6ONLY |
3012 | if (ai->ai_family == AF_INET6) { | |
3013 | int on = 1; | |
3014 | if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) < 0) | |
3015 | error("setsockopt IPV6_V6ONLY: %.100s", strerror(errno)); | |
3016 | } | |
3017 | #endif | |
554ebbed | 3018 | if (x11_use_localhost) |
3019 | channel_set_reuseaddr(sock); | |
48e671d5 | 3020 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { |
d7ac5f18 | 3021 | debug2("bind port %d: %.100s", port, strerror(errno)); |
48e671d5 | 3022 | close(sock); |
16218745 | 3023 | |
48e671d5 | 3024 | for (n = 0; n < num_socks; n++) { |
48e671d5 | 3025 | close(socks[n]); |
3026 | } | |
3027 | num_socks = 0; | |
3028 | break; | |
3029 | } | |
3030 | socks[num_socks++] = sock; | |
3031 | if (num_socks == NUM_SOCKS) | |
3032 | break; | |
5260325f | 3033 | } |
4ccb01d6 | 3034 | freeaddrinfo(aitop); |
48e671d5 | 3035 | if (num_socks > 0) |
3036 | break; | |
5260325f | 3037 | } |
3038 | if (display_number >= MAX_DISPLAYS) { | |
3039 | error("Failed to allocate internet-domain X11 display socket."); | |
c9d0ad9b | 3040 | return -1; |
8efc0c15 | 3041 | } |
5260325f | 3042 | /* Start listening for connections on the socket. */ |
48e671d5 | 3043 | for (n = 0; n < num_socks; n++) { |
3044 | sock = socks[n]; | |
fce39749 | 3045 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { |
48e671d5 | 3046 | error("listen: %.100s", strerror(errno)); |
48e671d5 | 3047 | close(sock); |
c9d0ad9b | 3048 | return -1; |
a7effaac | 3049 | } |
a7effaac | 3050 | } |
5260325f | 3051 | |
48e671d5 | 3052 | /* Allocate a channel for each socket. */ |
52e3daed | 3053 | *chanids = xcalloc(num_socks + 1, sizeof(**chanids)); |
48e671d5 | 3054 | for (n = 0; n < num_socks; n++) { |
3055 | sock = socks[n]; | |
ac151b18 | 3056 | nc = channel_new("x11 listener", |
0b242b12 | 3057 | SSH_CHANNEL_X11_LISTENER, sock, sock, -1, |
3058 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, | |
0d942eff | 3059 | 0, "X11 inet listener", 1); |
3a0d3d54 | 3060 | nc->single_connection = single_connection; |
59e5aff5 | 3061 | (*chanids)[n] = nc->self; |
48e671d5 | 3062 | } |
59e5aff5 | 3063 | (*chanids)[n] = -1; |
5260325f | 3064 | |
c9d0ad9b | 3065 | /* Return the display number for the DISPLAY environment variable. */ |
57f228e8 | 3066 | *display_numberp = display_number; |
3067 | return (0); | |
8efc0c15 | 3068 | } |
3069 | ||
396c147e | 3070 | static int |
1e3b8b07 | 3071 | connect_local_xsocket(u_int dnr) |
8efc0c15 | 3072 | { |
5260325f | 3073 | int sock; |
3074 | struct sockaddr_un addr; | |
5260325f | 3075 | |
805e659f | 3076 | sock = socket(AF_UNIX, SOCK_STREAM, 0); |
3077 | if (sock < 0) | |
3078 | error("socket: %.100s", strerror(errno)); | |
3079 | memset(&addr, 0, sizeof(addr)); | |
3080 | addr.sun_family = AF_UNIX; | |
3081 | snprintf(addr.sun_path, sizeof addr.sun_path, _PATH_UNIX_X, dnr); | |
32596c7b | 3082 | if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) == 0) |
805e659f | 3083 | return sock; |
3084 | close(sock); | |
5260325f | 3085 | error("connect %.100s: %.100s", addr.sun_path, strerror(errno)); |
3086 | return -1; | |
8efc0c15 | 3087 | } |
3088 | ||
0b242b12 | 3089 | int |
3090 | x11_connect_display(void) | |
8efc0c15 | 3091 | { |
4f16046f | 3092 | u_int display_number; |
5260325f | 3093 | const char *display; |
0b242b12 | 3094 | char buf[1024], *cp; |
48e671d5 | 3095 | struct addrinfo hints, *ai, *aitop; |
3096 | char strport[NI_MAXSERV]; | |
4f16046f | 3097 | int gaierr, sock = 0; |
5260325f | 3098 | |
5260325f | 3099 | /* Try to open a socket for the local X server. */ |
3100 | display = getenv("DISPLAY"); | |
3101 | if (!display) { | |
3102 | error("DISPLAY not set."); | |
0b242b12 | 3103 | return -1; |
5260325f | 3104 | } |
aa3378df | 3105 | /* |
3106 | * Now we decode the value of the DISPLAY variable and make a | |
3107 | * connection to the real X server. | |
3108 | */ | |
3109 | ||
3110 | /* | |
3111 | * Check if it is a unix domain socket. Unix domain displays are in | |
3112 | * one of the following formats: unix:d[.s], :d[.s], ::d[.s] | |
3113 | */ | |
5260325f | 3114 | if (strncmp(display, "unix:", 5) == 0 || |
3115 | display[0] == ':') { | |
3116 | /* Connect to the unix domain socket. */ | |
4f16046f | 3117 | if (sscanf(strrchr(display, ':') + 1, "%u", &display_number) != 1) { |
5260325f | 3118 | error("Could not parse display number from DISPLAY: %.100s", |
184eed6a | 3119 | display); |
0b242b12 | 3120 | return -1; |
5260325f | 3121 | } |
3122 | /* Create a socket. */ | |
3123 | sock = connect_local_xsocket(display_number); | |
3124 | if (sock < 0) | |
0b242b12 | 3125 | return -1; |
5260325f | 3126 | |
3127 | /* OK, we now have a connection to the display. */ | |
0b242b12 | 3128 | return sock; |
5260325f | 3129 | } |
aa3378df | 3130 | /* |
3131 | * Connect to an inet socket. The DISPLAY value is supposedly | |
3132 | * hostname:d[.s], where hostname may also be numeric IP address. | |
3133 | */ | |
74860245 | 3134 | strlcpy(buf, display, sizeof(buf)); |
5260325f | 3135 | cp = strchr(buf, ':'); |
3136 | if (!cp) { | |
3137 | error("Could not find ':' in DISPLAY: %.100s", display); | |
0b242b12 | 3138 | return -1; |
5260325f | 3139 | } |
3140 | *cp = 0; | |
aa3378df | 3141 | /* buf now contains the host name. But first we parse the display number. */ |
4f16046f | 3142 | if (sscanf(cp + 1, "%u", &display_number) != 1) { |
5260325f | 3143 | error("Could not parse display number from DISPLAY: %.100s", |
184eed6a | 3144 | display); |
0b242b12 | 3145 | return -1; |
5260325f | 3146 | } |
5260325f | 3147 | |
48e671d5 | 3148 | /* Look up the host address */ |
3149 | memset(&hints, 0, sizeof(hints)); | |
3150 | hints.ai_family = IPv4or6; | |
3151 | hints.ai_socktype = SOCK_STREAM; | |
4f16046f | 3152 | snprintf(strport, sizeof strport, "%u", 6000 + display_number); |
48e671d5 | 3153 | if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) { |
bb4626fe | 3154 | error("%.100s: unknown host. (%s)", buf, |
3155 | ssh_gai_strerror(gaierr)); | |
0b242b12 | 3156 | return -1; |
8efc0c15 | 3157 | } |
48e671d5 | 3158 | for (ai = aitop; ai; ai = ai->ai_next) { |
3159 | /* Create a socket. */ | |
3e131a6d | 3160 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
48e671d5 | 3161 | if (sock < 0) { |
d7ac5f18 | 3162 | debug2("socket: %.100s", strerror(errno)); |
7368a6c8 | 3163 | continue; |
3164 | } | |
3165 | /* Connect it to the display. */ | |
3166 | if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) { | |
4f16046f | 3167 | debug2("connect %.100s port %u: %.100s", buf, |
7368a6c8 | 3168 | 6000 + display_number, strerror(errno)); |
3169 | close(sock); | |
3170 | continue; | |
3171 | } | |
3172 | /* Success */ | |
3173 | break; | |
48e671d5 | 3174 | } |
48e671d5 | 3175 | freeaddrinfo(aitop); |
3176 | if (!ai) { | |
4f16046f | 3177 | error("connect %.100s port %u: %.100s", buf, 6000 + display_number, |
48e671d5 | 3178 | strerror(errno)); |
0b242b12 | 3179 | return -1; |
8efc0c15 | 3180 | } |
bcc0381e | 3181 | set_nodelay(sock); |
0b242b12 | 3182 | return sock; |
3183 | } | |
5260325f | 3184 | |
0b242b12 | 3185 | /* |
3186 | * This is called when SSH_SMSG_X11_OPEN is received. The packet contains | |
3187 | * the remote channel number. We should do whatever we want, and respond | |
3188 | * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE. | |
3189 | */ | |
5260325f | 3190 | |
ebb90778 | 3191 | /* ARGSUSED */ |
0b242b12 | 3192 | void |
7819b5c3 | 3193 | x11_input_open(int type, u_int32_t seq, void *ctxt) |
0b242b12 | 3194 | { |
719fc62f | 3195 | Channel *c = NULL; |
3196 | int remote_id, sock = 0; | |
0b242b12 | 3197 | char *remote_host; |
5260325f | 3198 | |
719fc62f | 3199 | debug("Received X11 open request."); |
5260325f | 3200 | |
719fc62f | 3201 | remote_id = packet_get_int(); |
8e7895b8 | 3202 | |
3203 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) { | |
719fc62f | 3204 | remote_host = packet_get_string(NULL); |
0b242b12 | 3205 | } else { |
3206 | remote_host = xstrdup("unknown (remote did not supply name)"); | |
0b242b12 | 3207 | } |
95500969 | 3208 | packet_check_eom(); |
0b242b12 | 3209 | |
3210 | /* Obtain a connection to the real X display. */ | |
3211 | sock = x11_connect_display(); | |
719fc62f | 3212 | if (sock != -1) { |
3213 | /* Allocate a channel for this connection. */ | |
3214 | c = channel_new("connected x11 socket", | |
3215 | SSH_CHANNEL_X11_OPEN, sock, sock, -1, 0, 0, 0, | |
3216 | remote_host, 1); | |
3a0d3d54 | 3217 | c->remote_id = remote_id; |
3218 | c->force_drain = 1; | |
719fc62f | 3219 | } |
0d942eff | 3220 | xfree(remote_host); |
719fc62f | 3221 | if (c == NULL) { |
0b242b12 | 3222 | /* Send refusal to the remote host. */ |
3223 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
719fc62f | 3224 | packet_put_int(remote_id); |
0b242b12 | 3225 | } else { |
0b242b12 | 3226 | /* Send a confirmation to the remote host. */ |
3227 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
719fc62f | 3228 | packet_put_int(remote_id); |
3229 | packet_put_int(c->self); | |
0b242b12 | 3230 | } |
719fc62f | 3231 | packet_send(); |
8efc0c15 | 3232 | } |
3233 | ||
a22aff1f | 3234 | /* dummy protocol handler that denies SSH-1 requests (agent/x11) */ |
ebb90778 | 3235 | /* ARGSUSED */ |
a22aff1f | 3236 | void |
7819b5c3 | 3237 | deny_input_open(int type, u_int32_t seq, void *ctxt) |
a22aff1f | 3238 | { |
3239 | int rchan = packet_get_int(); | |
e1feb9bf | 3240 | |
6aacefa7 | 3241 | switch (type) { |
a22aff1f | 3242 | case SSH_SMSG_AGENT_OPEN: |
3243 | error("Warning: ssh server tried agent forwarding."); | |
3244 | break; | |
3245 | case SSH_SMSG_X11_OPEN: | |
3246 | error("Warning: ssh server tried X11 forwarding."); | |
3247 | break; | |
3248 | default: | |
7819b5c3 | 3249 | error("deny_input_open: type %d", type); |
a22aff1f | 3250 | break; |
3251 | } | |
1908529f | 3252 | error("Warning: this is probably a break-in attempt by a malicious server."); |
a22aff1f | 3253 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
3254 | packet_put_int(rchan); | |
3255 | packet_send(); | |
3256 | } | |
3257 | ||
aa3378df | 3258 | /* |
3259 | * Requests forwarding of X11 connections, generates fake authentication | |
3260 | * data, and enables authentication spoofing. | |
8e7895b8 | 3261 | * This should be called in the client only. |
aa3378df | 3262 | */ |
6ae2364d | 3263 | void |
9bf083eb | 3264 | x11_request_forwarding_with_spoofing(int client_session_id, const char *disp, |
0b242b12 | 3265 | const char *proto, const char *data) |
8efc0c15 | 3266 | { |
1e3b8b07 | 3267 | u_int data_len = (u_int) strlen(data) / 2; |
ef07103c | 3268 | u_int i, value; |
5260325f | 3269 | char *new_data; |
3270 | int screen_number; | |
3271 | const char *cp; | |
ca75d7de | 3272 | u_int32_t rnd = 0; |
5260325f | 3273 | |
4297b666 | 3274 | if (x11_saved_display == NULL) |
3275 | x11_saved_display = xstrdup(disp); | |
3276 | else if (strcmp(disp, x11_saved_display) != 0) { | |
ef07103c | 3277 | error("x11_request_forwarding_with_spoofing: different " |
3278 | "$DISPLAY already forwarded"); | |
3279 | return; | |
3280 | } | |
3281 | ||
0875ae22 | 3282 | cp = strchr(disp, ':'); |
5260325f | 3283 | if (cp) |
3284 | cp = strchr(cp, '.'); | |
3285 | if (cp) | |
d6d4897e | 3286 | screen_number = (u_int)strtonum(cp + 1, 0, 400, NULL); |
5260325f | 3287 | else |
3288 | screen_number = 0; | |
3289 | ||
ef07103c | 3290 | if (x11_saved_proto == NULL) { |
3291 | /* Save protocol name. */ | |
3292 | x11_saved_proto = xstrdup(proto); | |
3293 | /* | |
56964485 | 3294 | * Extract real authentication data and generate fake data |
ef07103c | 3295 | * of the same length. |
3296 | */ | |
3297 | x11_saved_data = xmalloc(data_len); | |
3298 | x11_fake_data = xmalloc(data_len); | |
3299 | for (i = 0; i < data_len; i++) { | |
3300 | if (sscanf(data + 2 * i, "%2x", &value) != 1) | |
3301 | fatal("x11_request_forwarding: bad " | |
3302 | "authentication data: %.100s", data); | |
3303 | if (i % 4 == 0) | |
3304 | rnd = arc4random(); | |
3305 | x11_saved_data[i] = value; | |
3306 | x11_fake_data[i] = rnd & 0xff; | |
3307 | rnd >>= 8; | |
3308 | } | |
3309 | x11_saved_data_len = data_len; | |
3310 | x11_fake_data_len = data_len; | |
3311 | } | |
5260325f | 3312 | |
3313 | /* Convert the fake data into hex. */ | |
ef07103c | 3314 | new_data = tohex(x11_fake_data, data_len); |
5260325f | 3315 | |
3316 | /* Send the request packet. */ | |
0b242b12 | 3317 | if (compat20) { |
3318 | channel_request_start(client_session_id, "x11-req", 0); | |
3319 | packet_put_char(0); /* XXX bool single connection */ | |
3320 | } else { | |
3321 | packet_start(SSH_CMSG_X11_REQUEST_FORWARDING); | |
3322 | } | |
3323 | packet_put_cstring(proto); | |
3324 | packet_put_cstring(new_data); | |
5260325f | 3325 | packet_put_int(screen_number); |
3326 | packet_send(); | |
3327 | packet_write_wait(); | |
3328 | xfree(new_data); | |
8efc0c15 | 3329 | } |
3330 | ||
8e7895b8 | 3331 | |
3332 | /* -- agent forwarding */ | |
3333 | ||
8efc0c15 | 3334 | /* Sends a message to the server to request authentication fd forwarding. */ |
3335 | ||
6ae2364d | 3336 | void |
d5bb9418 | 3337 | auth_request_forwarding(void) |
8efc0c15 | 3338 | { |
5260325f | 3339 | packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING); |
3340 | packet_send(); | |
3341 | packet_write_wait(); | |
8efc0c15 | 3342 | } |