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cf851879 | 1 | /* $OpenBSD: channels.c,v 1.263 2006/08/01 23:22:47 stevesk 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 | |
44 | #include <sys/ioctl.h> | |
cebb4c24 | 45 | #include <sys/types.h> |
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> |
8efc0c15 | 62 | |
63 | #include "ssh.h" | |
42f11eb2 | 64 | #include "ssh1.h" |
65 | #include "ssh2.h" | |
8efc0c15 | 66 | #include "packet.h" |
67 | #include "xmalloc.h" | |
42f11eb2 | 68 | #include "log.h" |
69 | #include "misc.h" | |
8efc0c15 | 70 | #include "channels.h" |
8efc0c15 | 71 | #include "compat.h" |
42f11eb2 | 72 | #include "canohost.h" |
4c8722d9 | 73 | #include "key.h" |
74 | #include "authfd.h" | |
805e659f | 75 | #include "pathnames.h" |
f49658f5 | 76 | #include "bufaux.h" |
8efc0c15 | 77 | |
8e7895b8 | 78 | /* -- channel core */ |
8efc0c15 | 79 | |
aa3378df | 80 | /* |
81 | * Pointer to an array containing all allocated channels. The array is | |
82 | * dynamically extended as needed. | |
83 | */ | |
719fc62f | 84 | static Channel **channels = NULL; |
8efc0c15 | 85 | |
aa3378df | 86 | /* |
87 | * Size of the channel array. All slots of the array must always be | |
719fc62f | 88 | * initialized (at least the type field); unused slots set to NULL |
aa3378df | 89 | */ |
9a995072 | 90 | static u_int channels_alloc = 0; |
8efc0c15 | 91 | |
aa3378df | 92 | /* |
93 | * Maximum file descriptor value used in any of the channels. This is | |
719fc62f | 94 | * updated in channel_new. |
aa3378df | 95 | */ |
39929cdb | 96 | static int channel_max_fd = 0; |
8efc0c15 | 97 | |
8efc0c15 | 98 | |
8e7895b8 | 99 | /* -- tcp forwarding */ |
8efc0c15 | 100 | |
aa3378df | 101 | /* |
102 | * Data structure for storing which hosts are permitted for forward requests. | |
103 | * The local sides of any remote forwards are stored in this array to prevent | |
104 | * a corrupt remote server from accessing arbitrary TCP/IP ports on our local | |
105 | * network (which might be behind a firewall). | |
106 | */ | |
5260325f | 107 | typedef struct { |
7368a6c8 | 108 | char *host_to_connect; /* Connect to 'host'. */ |
109 | u_short port_to_connect; /* Connect to 'port'. */ | |
110 | u_short listen_port; /* Remote side should listen port number. */ | |
8efc0c15 | 111 | } ForwardPermission; |
112 | ||
2fefbadf | 113 | /* List of all permitted host/port pairs to connect by the user. */ |
8efc0c15 | 114 | static ForwardPermission permitted_opens[SSH_MAX_FORWARDS_PER_DIRECTION]; |
8e7895b8 | 115 | |
2fefbadf | 116 | /* List of all permitted host/port pairs to connect by the admin. */ |
117 | static ForwardPermission permitted_adm_opens[SSH_MAX_FORWARDS_PER_DIRECTION]; | |
118 | ||
119 | /* Number of permitted host/port pairs in the array permitted by the user. */ | |
8efc0c15 | 120 | static int num_permitted_opens = 0; |
2fefbadf | 121 | |
122 | /* Number of permitted host/port pair in the array permitted by the admin. */ | |
123 | static int num_adm_permitted_opens = 0; | |
124 | ||
aa3378df | 125 | /* |
126 | * If this is true, all opens are permitted. This is the case on the server | |
127 | * on which we have to trust the client anyway, and the user could do | |
128 | * anything after logging in anyway. | |
129 | */ | |
8efc0c15 | 130 | static int all_opens_permitted = 0; |
131 | ||
8efc0c15 | 132 | |
8e7895b8 | 133 | /* -- X11 forwarding */ |
42f11eb2 | 134 | |
8e7895b8 | 135 | /* Maximum number of fake X11 displays to try. */ |
136 | #define MAX_DISPLAYS 1000 | |
0490e609 | 137 | |
ef07103c | 138 | /* Saved X11 local (client) display. */ |
139 | static char *x11_saved_display = NULL; | |
140 | ||
8e7895b8 | 141 | /* Saved X11 authentication protocol name. */ |
142 | static char *x11_saved_proto = NULL; | |
8efc0c15 | 143 | |
8e7895b8 | 144 | /* Saved X11 authentication data. This is the real data. */ |
145 | static char *x11_saved_data = NULL; | |
146 | static u_int x11_saved_data_len = 0; | |
147 | ||
148 | /* | |
149 | * Fake X11 authentication data. This is what the server will be sending us; | |
150 | * we should replace any occurrences of this by the real data. | |
151 | */ | |
338eb2ab | 152 | static u_char *x11_fake_data = NULL; |
8e7895b8 | 153 | static u_int x11_fake_data_len; |
154 | ||
155 | ||
156 | /* -- agent forwarding */ | |
8efc0c15 | 157 | |
8e7895b8 | 158 | #define NUM_SOCKS 10 |
159 | ||
8e7895b8 | 160 | /* AF_UNSPEC or AF_INET or AF_INET6 */ |
5e4a7219 | 161 | static int IPv4or6 = AF_UNSPEC; |
8e7895b8 | 162 | |
163 | /* helper */ | |
396c147e | 164 | static void port_open_helper(Channel *c, char *rtype); |
8e7895b8 | 165 | |
166 | /* -- channel core */ | |
7368a6c8 | 167 | |
168 | Channel * | |
b872f7f0 | 169 | channel_by_id(int id) |
7368a6c8 | 170 | { |
171 | Channel *c; | |
719fc62f | 172 | |
9a995072 | 173 | if (id < 0 || (u_int)id >= channels_alloc) { |
b872f7f0 | 174 | logit("channel_by_id: %d: bad id", id); |
7368a6c8 | 175 | return NULL; |
176 | } | |
719fc62f | 177 | c = channels[id]; |
178 | if (c == NULL) { | |
b872f7f0 | 179 | logit("channel_by_id: %d: bad id: channel free", id); |
7368a6c8 | 180 | return NULL; |
181 | } | |
182 | return c; | |
183 | } | |
184 | ||
b872f7f0 | 185 | /* |
186 | * Returns the channel if it is allowed to receive protocol messages. | |
187 | * Private channels, like listening sockets, may not receive messages. | |
188 | */ | |
189 | Channel * | |
190 | channel_lookup(int id) | |
191 | { | |
192 | Channel *c; | |
193 | ||
194 | if ((c = channel_by_id(id)) == NULL) | |
195 | return (NULL); | |
196 | ||
c8e9c167 | 197 | switch (c->type) { |
b872f7f0 | 198 | case SSH_CHANNEL_X11_OPEN: |
199 | case SSH_CHANNEL_LARVAL: | |
200 | case SSH_CHANNEL_CONNECTING: | |
201 | case SSH_CHANNEL_DYNAMIC: | |
202 | case SSH_CHANNEL_OPENING: | |
203 | case SSH_CHANNEL_OPEN: | |
204 | case SSH_CHANNEL_INPUT_DRAINING: | |
205 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
206 | return (c); | |
b872f7f0 | 207 | } |
208 | logit("Non-public channel %d, type %d.", id, c->type); | |
209 | return (NULL); | |
210 | } | |
211 | ||
aa3378df | 212 | /* |
1d1ffb87 | 213 | * Register filedescriptors for a channel, used when allocating a channel or |
0fbe8c74 | 214 | * when the channel consumer/producer is ready, e.g. shell exec'd |
aa3378df | 215 | */ |
396c147e | 216 | static void |
a22aff1f | 217 | channel_register_fds(Channel *c, int rfd, int wfd, int efd, |
218 | int extusage, int nonblock) | |
8efc0c15 | 219 | { |
5260325f | 220 | /* Update the maximum file descriptor value. */ |
39929cdb | 221 | channel_max_fd = MAX(channel_max_fd, rfd); |
222 | channel_max_fd = MAX(channel_max_fd, wfd); | |
223 | channel_max_fd = MAX(channel_max_fd, efd); | |
224 | ||
aa3378df | 225 | /* XXX set close-on-exec -markus */ |
1d1ffb87 | 226 | |
0fbe8c74 | 227 | c->rfd = rfd; |
228 | c->wfd = wfd; | |
229 | c->sock = (rfd == wfd) ? rfd : -1; | |
5e96b616 | 230 | c->ctl_fd = -1; /* XXX: set elsewhere */ |
0fbe8c74 | 231 | c->efd = efd; |
232 | c->extended_usage = extusage; | |
a22aff1f | 233 | |
0ae4fe1d | 234 | /* XXX ugly hack: nonblock is only set by the server */ |
235 | if (nonblock && isatty(c->rfd)) { | |
d7ac5f18 | 236 | debug2("channel %d: rfd %d isatty", c->self, c->rfd); |
0ae4fe1d | 237 | c->isatty = 1; |
238 | if (!isatty(c->wfd)) { | |
94dfb550 | 239 | error("channel %d: wfd %d is not a tty?", |
0ae4fe1d | 240 | c->self, c->wfd); |
241 | } | |
242 | } else { | |
243 | c->isatty = 0; | |
244 | } | |
21c2c5cd | 245 | c->wfd_isatty = isatty(c->wfd); |
0ae4fe1d | 246 | |
a22aff1f | 247 | /* enable nonblocking mode */ |
248 | if (nonblock) { | |
249 | if (rfd != -1) | |
250 | set_nonblock(rfd); | |
251 | if (wfd != -1) | |
252 | set_nonblock(wfd); | |
253 | if (efd != -1) | |
254 | set_nonblock(efd); | |
255 | } | |
0fbe8c74 | 256 | } |
257 | ||
258 | /* | |
259 | * Allocate a new channel object and set its type and socket. This will cause | |
260 | * remote_name to be freed. | |
261 | */ | |
719fc62f | 262 | Channel * |
0fbe8c74 | 263 | channel_new(char *ctype, int type, int rfd, int wfd, int efd, |
f91d9a89 | 264 | u_int window, u_int maxpack, int extusage, char *remote_name, int nonblock) |
0fbe8c74 | 265 | { |
9a995072 | 266 | int found; |
267 | u_int i; | |
0fbe8c74 | 268 | Channel *c; |
5260325f | 269 | |
270 | /* Do initial allocation if this is the first call. */ | |
271 | if (channels_alloc == 0) { | |
272 | channels_alloc = 10; | |
52e3daed | 273 | channels = xcalloc(channels_alloc, sizeof(Channel *)); |
5260325f | 274 | for (i = 0; i < channels_alloc; i++) |
719fc62f | 275 | channels[i] = NULL; |
5260325f | 276 | } |
277 | /* Try to find a free slot where to put the new channel. */ | |
278 | for (found = -1, i = 0; i < channels_alloc; i++) | |
719fc62f | 279 | if (channels[i] == NULL) { |
5260325f | 280 | /* Found a free slot. */ |
9a995072 | 281 | found = (int)i; |
5260325f | 282 | break; |
283 | } | |
9a995072 | 284 | if (found < 0) { |
aa3378df | 285 | /* There are no free slots. Take last+1 slot and expand the array. */ |
5260325f | 286 | found = channels_alloc; |
5df8c731 | 287 | if (channels_alloc > 10000) |
288 | fatal("channel_new: internal error: channels_alloc %d " | |
289 | "too big.", channels_alloc); | |
c5d10563 | 290 | channels = xrealloc(channels, channels_alloc + 10, |
291 | sizeof(Channel *)); | |
20419cc1 | 292 | channels_alloc += 10; |
de273eef | 293 | debug2("channel: expanding %d", channels_alloc); |
5260325f | 294 | for (i = found; i < channels_alloc; i++) |
719fc62f | 295 | channels[i] = NULL; |
5260325f | 296 | } |
719fc62f | 297 | /* Initialize and return new channel. */ |
52e3daed | 298 | c = channels[found] = xcalloc(1, sizeof(Channel)); |
5260325f | 299 | buffer_init(&c->input); |
300 | buffer_init(&c->output); | |
7368a6c8 | 301 | buffer_init(&c->extended); |
70bef40e | 302 | c->ostate = CHAN_OUTPUT_OPEN; |
303 | c->istate = CHAN_INPUT_OPEN; | |
304 | c->flags = 0; | |
a22aff1f | 305 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock); |
5260325f | 306 | c->self = found; |
307 | c->type = type; | |
7368a6c8 | 308 | c->ctype = ctype; |
0b242b12 | 309 | c->local_window = window; |
310 | c->local_window_max = window; | |
311 | c->local_consumed = 0; | |
312 | c->local_maxpacket = maxpack; | |
5260325f | 313 | c->remote_id = -1; |
0d942eff | 314 | c->remote_name = xstrdup(remote_name); |
7368a6c8 | 315 | c->remote_window = 0; |
316 | c->remote_maxpacket = 0; | |
a5f82435 | 317 | c->force_drain = 0; |
ac151b18 | 318 | c->single_connection = 0; |
3cf2be58 | 319 | c->detach_user = NULL; |
8cd0437d | 320 | c->detach_close = 0; |
05ca0898 | 321 | c->confirm = NULL; |
5e96b616 | 322 | c->confirm_ctx = NULL; |
2e73a022 | 323 | c->input_filter = NULL; |
c1c6a032 | 324 | c->output_filter = NULL; |
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; |
8e7895b8 | 381 | |
382 | for (n = 0, i = 0; i < channels_alloc; i++) | |
383 | if (channels[i]) | |
384 | n++; | |
9a995072 | 385 | debug("channel %d: free: %s, nchannels %u", c->self, |
8e7895b8 | 386 | c->remote_name ? c->remote_name : "???", n); |
387 | ||
388 | s = channel_open_message(); | |
d7ac5f18 | 389 | debug3("channel %d: status: %s", c->self, s); |
8e7895b8 | 390 | xfree(s); |
391 | ||
8e7895b8 | 392 | if (c->sock != -1) |
393 | shutdown(c->sock, SHUT_RDWR); | |
5e96b616 | 394 | if (c->ctl_fd != -1) |
395 | shutdown(c->ctl_fd, SHUT_RDWR); | |
8e7895b8 | 396 | channel_close_fds(c); |
397 | buffer_free(&c->input); | |
398 | buffer_free(&c->output); | |
399 | buffer_free(&c->extended); | |
400 | if (c->remote_name) { | |
401 | xfree(c->remote_name); | |
402 | c->remote_name = NULL; | |
403 | } | |
404 | channels[c->self] = NULL; | |
405 | xfree(c); | |
406 | } | |
407 | ||
8e7895b8 | 408 | void |
d6746a0b | 409 | channel_free_all(void) |
8e7895b8 | 410 | { |
9a995072 | 411 | u_int i; |
8e7895b8 | 412 | |
d6746a0b | 413 | for (i = 0; i < channels_alloc; i++) |
414 | if (channels[i] != NULL) | |
415 | channel_free(channels[i]); | |
8e7895b8 | 416 | } |
417 | ||
418 | /* | |
419 | * Closes the sockets/fds of all channels. This is used to close extra file | |
420 | * descriptors after a fork. | |
421 | */ | |
8e7895b8 | 422 | void |
d5bb9418 | 423 | channel_close_all(void) |
8e7895b8 | 424 | { |
9a995072 | 425 | u_int i; |
8e7895b8 | 426 | |
427 | for (i = 0; i < channels_alloc; i++) | |
428 | if (channels[i] != NULL) | |
429 | channel_close_fds(channels[i]); | |
430 | } | |
431 | ||
3cf2be58 | 432 | /* |
433 | * Stop listening to channels. | |
434 | */ | |
3cf2be58 | 435 | void |
436 | channel_stop_listening(void) | |
437 | { | |
9a995072 | 438 | u_int i; |
3cf2be58 | 439 | Channel *c; |
440 | ||
441 | for (i = 0; i < channels_alloc; i++) { | |
442 | c = channels[i]; | |
443 | if (c != NULL) { | |
444 | switch (c->type) { | |
445 | case SSH_CHANNEL_AUTH_SOCKET: | |
446 | case SSH_CHANNEL_PORT_LISTENER: | |
447 | case SSH_CHANNEL_RPORT_LISTENER: | |
448 | case SSH_CHANNEL_X11_LISTENER: | |
489aa2e9 | 449 | channel_close_fd(&c->sock); |
3cf2be58 | 450 | channel_free(c); |
451 | break; | |
452 | } | |
453 | } | |
454 | } | |
455 | } | |
456 | ||
8e7895b8 | 457 | /* |
458 | * Returns true if no channel has too much buffered data, and false if one or | |
459 | * more channel is overfull. | |
460 | */ | |
8e7895b8 | 461 | int |
d5bb9418 | 462 | channel_not_very_much_buffered_data(void) |
8e7895b8 | 463 | { |
464 | u_int i; | |
465 | Channel *c; | |
466 | ||
467 | for (i = 0; i < channels_alloc; i++) { | |
468 | c = channels[i]; | |
469 | if (c != NULL && c->type == SSH_CHANNEL_OPEN) { | |
0c139bd1 | 470 | #if 0 |
471 | if (!compat20 && | |
472 | buffer_len(&c->input) > packet_get_maxsize()) { | |
faa483fa | 473 | debug2("channel %d: big input buffer %d", |
8e7895b8 | 474 | c->self, buffer_len(&c->input)); |
475 | return 0; | |
476 | } | |
0c139bd1 | 477 | #endif |
8e7895b8 | 478 | if (buffer_len(&c->output) > packet_get_maxsize()) { |
a27002e5 | 479 | debug2("channel %d: big output buffer %u > %u", |
0c139bd1 | 480 | c->self, buffer_len(&c->output), |
481 | packet_get_maxsize()); | |
8e7895b8 | 482 | return 0; |
483 | } | |
484 | } | |
485 | } | |
486 | return 1; | |
487 | } | |
488 | ||
489 | /* Returns true if any channel is still open. */ | |
8e7895b8 | 490 | int |
d5bb9418 | 491 | channel_still_open(void) |
8e7895b8 | 492 | { |
9a995072 | 493 | u_int i; |
8e7895b8 | 494 | Channel *c; |
495 | ||
496 | for (i = 0; i < channels_alloc; i++) { | |
497 | c = channels[i]; | |
498 | if (c == NULL) | |
499 | continue; | |
500 | switch (c->type) { | |
501 | case SSH_CHANNEL_X11_LISTENER: | |
502 | case SSH_CHANNEL_PORT_LISTENER: | |
503 | case SSH_CHANNEL_RPORT_LISTENER: | |
504 | case SSH_CHANNEL_CLOSED: | |
505 | case SSH_CHANNEL_AUTH_SOCKET: | |
506 | case SSH_CHANNEL_DYNAMIC: | |
507 | case SSH_CHANNEL_CONNECTING: | |
508 | case SSH_CHANNEL_ZOMBIE: | |
509 | continue; | |
510 | case SSH_CHANNEL_LARVAL: | |
511 | if (!compat20) | |
512 | fatal("cannot happen: SSH_CHANNEL_LARVAL"); | |
513 | continue; | |
514 | case SSH_CHANNEL_OPENING: | |
515 | case SSH_CHANNEL_OPEN: | |
516 | case SSH_CHANNEL_X11_OPEN: | |
517 | return 1; | |
518 | case SSH_CHANNEL_INPUT_DRAINING: | |
519 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
520 | if (!compat13) | |
521 | fatal("cannot happen: OUT_DRAIN"); | |
522 | return 1; | |
523 | default: | |
524 | fatal("channel_still_open: bad channel type %d", c->type); | |
525 | /* NOTREACHED */ | |
526 | } | |
527 | } | |
528 | return 0; | |
529 | } | |
530 | ||
531 | /* Returns the id of an open channel suitable for keepaliving */ | |
8e7895b8 | 532 | int |
d5bb9418 | 533 | channel_find_open(void) |
8e7895b8 | 534 | { |
9a995072 | 535 | u_int i; |
8e7895b8 | 536 | Channel *c; |
537 | ||
538 | for (i = 0; i < channels_alloc; i++) { | |
539 | c = channels[i]; | |
13de3560 | 540 | if (c == NULL || c->remote_id < 0) |
8e7895b8 | 541 | continue; |
542 | switch (c->type) { | |
543 | case SSH_CHANNEL_CLOSED: | |
544 | case SSH_CHANNEL_DYNAMIC: | |
545 | case SSH_CHANNEL_X11_LISTENER: | |
546 | case SSH_CHANNEL_PORT_LISTENER: | |
547 | case SSH_CHANNEL_RPORT_LISTENER: | |
548 | case SSH_CHANNEL_OPENING: | |
549 | case SSH_CHANNEL_CONNECTING: | |
550 | case SSH_CHANNEL_ZOMBIE: | |
551 | continue; | |
552 | case SSH_CHANNEL_LARVAL: | |
553 | case SSH_CHANNEL_AUTH_SOCKET: | |
554 | case SSH_CHANNEL_OPEN: | |
555 | case SSH_CHANNEL_X11_OPEN: | |
556 | return i; | |
557 | case SSH_CHANNEL_INPUT_DRAINING: | |
558 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
559 | if (!compat13) | |
560 | fatal("cannot happen: OUT_DRAIN"); | |
561 | return i; | |
562 | default: | |
563 | fatal("channel_find_open: bad channel type %d", c->type); | |
564 | /* NOTREACHED */ | |
565 | } | |
566 | } | |
567 | return -1; | |
568 | } | |
569 | ||
570 | ||
571 | /* | |
572 | * Returns a message describing the currently open forwarded connections, | |
573 | * suitable for sending to the client. The message contains crlf pairs for | |
574 | * newlines. | |
575 | */ | |
8e7895b8 | 576 | char * |
d5bb9418 | 577 | channel_open_message(void) |
8e7895b8 | 578 | { |
579 | Buffer buffer; | |
580 | Channel *c; | |
581 | char buf[1024], *cp; | |
9a995072 | 582 | u_int i; |
8e7895b8 | 583 | |
584 | buffer_init(&buffer); | |
585 | snprintf(buf, sizeof buf, "The following connections are open:\r\n"); | |
586 | buffer_append(&buffer, buf, strlen(buf)); | |
587 | for (i = 0; i < channels_alloc; i++) { | |
588 | c = channels[i]; | |
589 | if (c == NULL) | |
590 | continue; | |
591 | switch (c->type) { | |
592 | case SSH_CHANNEL_X11_LISTENER: | |
593 | case SSH_CHANNEL_PORT_LISTENER: | |
594 | case SSH_CHANNEL_RPORT_LISTENER: | |
595 | case SSH_CHANNEL_CLOSED: | |
596 | case SSH_CHANNEL_AUTH_SOCKET: | |
597 | case SSH_CHANNEL_ZOMBIE: | |
598 | continue; | |
599 | case SSH_CHANNEL_LARVAL: | |
600 | case SSH_CHANNEL_OPENING: | |
601 | case SSH_CHANNEL_CONNECTING: | |
602 | case SSH_CHANNEL_DYNAMIC: | |
603 | case SSH_CHANNEL_OPEN: | |
604 | case SSH_CHANNEL_X11_OPEN: | |
605 | case SSH_CHANNEL_INPUT_DRAINING: | |
606 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
5e96b616 | 607 | snprintf(buf, sizeof buf, |
608 | " #%d %.300s (t%d r%d i%d/%d o%d/%d fd %d/%d cfd %d)\r\n", | |
8e7895b8 | 609 | c->self, c->remote_name, |
610 | c->type, c->remote_id, | |
611 | c->istate, buffer_len(&c->input), | |
612 | c->ostate, buffer_len(&c->output), | |
5e96b616 | 613 | c->rfd, c->wfd, c->ctl_fd); |
8e7895b8 | 614 | buffer_append(&buffer, buf, strlen(buf)); |
615 | continue; | |
616 | default: | |
617 | fatal("channel_open_message: bad channel type %d", c->type); | |
618 | /* NOTREACHED */ | |
619 | } | |
620 | } | |
621 | buffer_append(&buffer, "\0", 1); | |
622 | cp = xstrdup(buffer_ptr(&buffer)); | |
623 | buffer_free(&buffer); | |
624 | return cp; | |
625 | } | |
626 | ||
627 | void | |
628 | channel_send_open(int id) | |
629 | { | |
630 | Channel *c = channel_lookup(id); | |
e1feb9bf | 631 | |
8e7895b8 | 632 | if (c == NULL) { |
bbe88b6d | 633 | logit("channel_send_open: %d: bad id", id); |
8e7895b8 | 634 | return; |
635 | } | |
6226a8f8 | 636 | debug2("channel %d: send open", id); |
8e7895b8 | 637 | packet_start(SSH2_MSG_CHANNEL_OPEN); |
638 | packet_put_cstring(c->ctype); | |
639 | packet_put_int(c->self); | |
640 | packet_put_int(c->local_window); | |
641 | packet_put_int(c->local_maxpacket); | |
642 | packet_send(); | |
643 | } | |
644 | ||
645 | void | |
6226a8f8 | 646 | channel_request_start(int id, char *service, int wantconfirm) |
8e7895b8 | 647 | { |
6226a8f8 | 648 | Channel *c = channel_lookup(id); |
e1feb9bf | 649 | |
8e7895b8 | 650 | if (c == NULL) { |
bbe88b6d | 651 | logit("channel_request_start: %d: unknown channel id", id); |
8e7895b8 | 652 | return; |
653 | } | |
5e96b616 | 654 | debug2("channel %d: request %s confirm %d", id, service, wantconfirm); |
8e7895b8 | 655 | packet_start(SSH2_MSG_CHANNEL_REQUEST); |
656 | packet_put_int(c->remote_id); | |
657 | packet_put_cstring(service); | |
658 | packet_put_char(wantconfirm); | |
659 | } | |
a7137f6b | 660 | |
8e7895b8 | 661 | void |
5e96b616 | 662 | channel_register_confirm(int id, channel_callback_fn *fn, void *ctx) |
8e7895b8 | 663 | { |
664 | Channel *c = channel_lookup(id); | |
e1feb9bf | 665 | |
8e7895b8 | 666 | if (c == NULL) { |
bbe88b6d | 667 | logit("channel_register_comfirm: %d: bad id", id); |
8e7895b8 | 668 | return; |
669 | } | |
05ca0898 | 670 | c->confirm = fn; |
5e96b616 | 671 | c->confirm_ctx = ctx; |
8e7895b8 | 672 | } |
a7137f6b | 673 | |
8e7895b8 | 674 | void |
8cd0437d | 675 | channel_register_cleanup(int id, channel_callback_fn *fn, int do_close) |
8e7895b8 | 676 | { |
b872f7f0 | 677 | Channel *c = channel_by_id(id); |
e1feb9bf | 678 | |
8e7895b8 | 679 | if (c == NULL) { |
bbe88b6d | 680 | logit("channel_register_cleanup: %d: bad id", id); |
8e7895b8 | 681 | return; |
682 | } | |
3cf2be58 | 683 | c->detach_user = fn; |
8cd0437d | 684 | c->detach_close = do_close; |
8e7895b8 | 685 | } |
a7137f6b | 686 | |
8e7895b8 | 687 | void |
688 | channel_cancel_cleanup(int id) | |
689 | { | |
b872f7f0 | 690 | Channel *c = channel_by_id(id); |
e1feb9bf | 691 | |
8e7895b8 | 692 | if (c == NULL) { |
bbe88b6d | 693 | logit("channel_cancel_cleanup: %d: bad id", id); |
8e7895b8 | 694 | return; |
695 | } | |
3cf2be58 | 696 | c->detach_user = NULL; |
8cd0437d | 697 | c->detach_close = 0; |
8e7895b8 | 698 | } |
a7137f6b | 699 | |
8e7895b8 | 700 | void |
c1c6a032 | 701 | channel_register_filter(int id, channel_infilter_fn *ifn, |
702 | channel_outfilter_fn *ofn) | |
8e7895b8 | 703 | { |
704 | Channel *c = channel_lookup(id); | |
e1feb9bf | 705 | |
8e7895b8 | 706 | if (c == NULL) { |
bbe88b6d | 707 | logit("channel_register_filter: %d: bad id", id); |
8e7895b8 | 708 | return; |
709 | } | |
c1c6a032 | 710 | c->input_filter = ifn; |
711 | c->output_filter = ofn; | |
8e7895b8 | 712 | } |
713 | ||
6ae2364d | 714 | void |
8e7895b8 | 715 | channel_set_fds(int id, int rfd, int wfd, int efd, |
399d1ea6 | 716 | int extusage, int nonblock, u_int window_max) |
8efc0c15 | 717 | { |
8e7895b8 | 718 | Channel *c = channel_lookup(id); |
e1feb9bf | 719 | |
8e7895b8 | 720 | if (c == NULL || c->type != SSH_CHANNEL_LARVAL) |
721 | fatal("channel_activate for non-larval channel %d.", id); | |
722 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock); | |
723 | c->type = SSH_CHANNEL_OPEN; | |
399d1ea6 | 724 | c->local_window = c->local_window_max = window_max; |
8e7895b8 | 725 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
726 | packet_put_int(c->remote_id); | |
727 | packet_put_int(c->local_window); | |
728 | packet_send(); | |
8efc0c15 | 729 | } |
730 | ||
aa3378df | 731 | /* |
7368a6c8 | 732 | * 'channel_pre*' are called just before select() to add any bits relevant to |
733 | * channels in the select bitmasks. | |
aa3378df | 734 | */ |
7368a6c8 | 735 | /* |
736 | * 'channel_post*': perform any appropriate operations for channels which | |
737 | * have events pending. | |
738 | */ | |
c8e9c167 | 739 | typedef void chan_fn(Channel *c, fd_set *readset, fd_set *writeset); |
7368a6c8 | 740 | chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE]; |
741 | chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE]; | |
8efc0c15 | 742 | |
ebb90778 | 743 | /* ARGSUSED */ |
396c147e | 744 | static void |
c8e9c167 | 745 | channel_pre_listener(Channel *c, fd_set *readset, fd_set *writeset) |
8efc0c15 | 746 | { |
7368a6c8 | 747 | FD_SET(c->sock, readset); |
748 | } | |
5260325f | 749 | |
ebb90778 | 750 | /* ARGSUSED */ |
396c147e | 751 | static void |
c8e9c167 | 752 | channel_pre_connecting(Channel *c, fd_set *readset, fd_set *writeset) |
97fb6912 | 753 | { |
754 | debug3("channel %d: waiting for connection", c->self); | |
755 | FD_SET(c->sock, writeset); | |
756 | } | |
757 | ||
396c147e | 758 | static void |
c8e9c167 | 759 | channel_pre_open_13(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 760 | { |
761 | if (buffer_len(&c->input) < packet_get_maxsize()) | |
762 | FD_SET(c->sock, readset); | |
763 | if (buffer_len(&c->output) > 0) | |
764 | FD_SET(c->sock, writeset); | |
765 | } | |
5260325f | 766 | |
396c147e | 767 | static void |
c8e9c167 | 768 | channel_pre_open(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 769 | { |
0c0738d5 | 770 | u_int limit = compat20 ? c->remote_window : packet_get_maxsize(); |
5260325f | 771 | |
7e7327a1 | 772 | if (c->istate == CHAN_INPUT_OPEN && |
0c0738d5 | 773 | limit > 0 && |
69d9d413 | 774 | buffer_len(&c->input) < limit && |
775 | buffer_check_alloc(&c->input, CHAN_RBUF)) | |
7e7327a1 | 776 | FD_SET(c->rfd, readset); |
777 | if (c->ostate == CHAN_OUTPUT_OPEN || | |
778 | c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { | |
779 | if (buffer_len(&c->output) > 0) { | |
780 | FD_SET(c->wfd, writeset); | |
781 | } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { | |
d2296ed7 | 782 | if (CHANNEL_EFD_OUTPUT_ACTIVE(c)) |
4e2e5cfd | 783 | debug2("channel %d: obuf_empty delayed efd %d/(%d)", |
784 | c->self, c->efd, buffer_len(&c->extended)); | |
d2296ed7 | 785 | else |
786 | chan_obuf_empty(c); | |
7e7327a1 | 787 | } |
788 | } | |
789 | /** XXX check close conditions, too */ | |
0c0738d5 | 790 | if (compat20 && c->efd != -1) { |
7e7327a1 | 791 | if (c->extended_usage == CHAN_EXTENDED_WRITE && |
792 | buffer_len(&c->extended) > 0) | |
793 | FD_SET(c->efd, writeset); | |
d2296ed7 | 794 | else if (!(c->flags & CHAN_EOF_SENT) && |
795 | c->extended_usage == CHAN_EXTENDED_READ && | |
7e7327a1 | 796 | buffer_len(&c->extended) < c->remote_window) |
797 | FD_SET(c->efd, readset); | |
798 | } | |
5e96b616 | 799 | /* XXX: What about efd? races? */ |
f2107e97 | 800 | if (compat20 && c->ctl_fd != -1 && |
5e96b616 | 801 | c->istate == CHAN_INPUT_OPEN && c->ostate == CHAN_OUTPUT_OPEN) |
802 | FD_SET(c->ctl_fd, readset); | |
7e7327a1 | 803 | } |
804 | ||
ebb90778 | 805 | /* ARGSUSED */ |
396c147e | 806 | static void |
c8e9c167 | 807 | channel_pre_input_draining(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 808 | { |
809 | if (buffer_len(&c->input) == 0) { | |
810 | packet_start(SSH_MSG_CHANNEL_CLOSE); | |
811 | packet_put_int(c->remote_id); | |
812 | packet_send(); | |
813 | c->type = SSH_CHANNEL_CLOSED; | |
d7ac5f18 | 814 | debug2("channel %d: closing after input drain.", c->self); |
7368a6c8 | 815 | } |
816 | } | |
5260325f | 817 | |
ebb90778 | 818 | /* ARGSUSED */ |
396c147e | 819 | static void |
c8e9c167 | 820 | channel_pre_output_draining(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 821 | { |
822 | if (buffer_len(&c->output) == 0) | |
719fc62f | 823 | chan_mark_dead(c); |
6ae2364d | 824 | else |
7368a6c8 | 825 | FD_SET(c->sock, writeset); |
826 | } | |
5260325f | 827 | |
7368a6c8 | 828 | /* |
829 | * This is a special state for X11 authentication spoofing. An opened X11 | |
830 | * connection (when authentication spoofing is being done) remains in this | |
831 | * state until the first packet has been completely read. The authentication | |
832 | * data in that packet is then substituted by the real data if it matches the | |
833 | * fake data, and the channel is put into normal mode. | |
0b242b12 | 834 | * XXX All this happens at the client side. |
8e7895b8 | 835 | * Returns: 0 = need more data, -1 = wrong cookie, 1 = ok |
7368a6c8 | 836 | */ |
396c147e | 837 | static int |
8e7895b8 | 838 | x11_open_helper(Buffer *b) |
7368a6c8 | 839 | { |
1e3b8b07 | 840 | u_char *ucp; |
841 | u_int proto_len, data_len; | |
5260325f | 842 | |
7368a6c8 | 843 | /* Check if the fixed size part of the packet is in buffer. */ |
8e7895b8 | 844 | if (buffer_len(b) < 12) |
7368a6c8 | 845 | return 0; |
846 | ||
847 | /* Parse the lengths of variable-length fields. */ | |
20905a8e | 848 | ucp = buffer_ptr(b); |
7368a6c8 | 849 | if (ucp[0] == 0x42) { /* Byte order MSB first. */ |
850 | proto_len = 256 * ucp[6] + ucp[7]; | |
851 | data_len = 256 * ucp[8] + ucp[9]; | |
852 | } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */ | |
853 | proto_len = ucp[6] + 256 * ucp[7]; | |
854 | data_len = ucp[8] + 256 * ucp[9]; | |
855 | } else { | |
d7ac5f18 | 856 | debug2("Initial X11 packet contains bad byte order byte: 0x%x", |
184eed6a | 857 | ucp[0]); |
7368a6c8 | 858 | return -1; |
859 | } | |
5260325f | 860 | |
7368a6c8 | 861 | /* Check if the whole packet is in buffer. */ |
8e7895b8 | 862 | if (buffer_len(b) < |
7368a6c8 | 863 | 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3)) |
864 | return 0; | |
5260325f | 865 | |
7368a6c8 | 866 | /* Check if authentication protocol matches. */ |
867 | if (proto_len != strlen(x11_saved_proto) || | |
868 | memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) { | |
d7ac5f18 | 869 | debug2("X11 connection uses different authentication protocol."); |
7368a6c8 | 870 | return -1; |
871 | } | |
872 | /* Check if authentication data matches our fake data. */ | |
873 | if (data_len != x11_fake_data_len || | |
874 | memcmp(ucp + 12 + ((proto_len + 3) & ~3), | |
875 | x11_fake_data, x11_fake_data_len) != 0) { | |
d7ac5f18 | 876 | debug2("X11 auth data does not match fake data."); |
7368a6c8 | 877 | return -1; |
878 | } | |
879 | /* Check fake data length */ | |
880 | if (x11_fake_data_len != x11_saved_data_len) { | |
881 | error("X11 fake_data_len %d != saved_data_len %d", | |
882 | x11_fake_data_len, x11_saved_data_len); | |
883 | return -1; | |
884 | } | |
885 | /* | |
886 | * Received authentication protocol and data match | |
887 | * our fake data. Substitute the fake data with real | |
888 | * data. | |
889 | */ | |
890 | memcpy(ucp + 12 + ((proto_len + 3) & ~3), | |
891 | x11_saved_data, x11_saved_data_len); | |
892 | return 1; | |
893 | } | |
5260325f | 894 | |
396c147e | 895 | static void |
c8e9c167 | 896 | channel_pre_x11_open_13(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 897 | { |
8e7895b8 | 898 | int ret = x11_open_helper(&c->output); |
e1feb9bf | 899 | |
7368a6c8 | 900 | if (ret == 1) { |
901 | /* Start normal processing for the channel. */ | |
902 | c->type = SSH_CHANNEL_OPEN; | |
a8be9f80 | 903 | channel_pre_open_13(c, readset, writeset); |
7368a6c8 | 904 | } else if (ret == -1) { |
905 | /* | |
906 | * We have received an X11 connection that has bad | |
907 | * authentication information. | |
908 | */ | |
bbe88b6d | 909 | logit("X11 connection rejected because of wrong authentication."); |
7368a6c8 | 910 | buffer_clear(&c->input); |
911 | buffer_clear(&c->output); | |
489aa2e9 | 912 | channel_close_fd(&c->sock); |
7368a6c8 | 913 | c->sock = -1; |
914 | c->type = SSH_CHANNEL_CLOSED; | |
915 | packet_start(SSH_MSG_CHANNEL_CLOSE); | |
916 | packet_put_int(c->remote_id); | |
917 | packet_send(); | |
918 | } | |
919 | } | |
5260325f | 920 | |
396c147e | 921 | static void |
c8e9c167 | 922 | channel_pre_x11_open(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 923 | { |
8e7895b8 | 924 | int ret = x11_open_helper(&c->output); |
a5f82435 | 925 | |
926 | /* c->force_drain = 1; */ | |
927 | ||
7368a6c8 | 928 | if (ret == 1) { |
929 | c->type = SSH_CHANNEL_OPEN; | |
0c0738d5 | 930 | channel_pre_open(c, readset, writeset); |
7368a6c8 | 931 | } else if (ret == -1) { |
bbe88b6d | 932 | logit("X11 connection rejected because of wrong authentication."); |
d7ac5f18 | 933 | debug2("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate); |
8341f420 | 934 | chan_read_failed(c); |
935 | buffer_clear(&c->input); | |
936 | chan_ibuf_empty(c); | |
937 | buffer_clear(&c->output); | |
938 | /* for proto v1, the peer will send an IEOF */ | |
939 | if (compat20) | |
940 | chan_write_failed(c); | |
941 | else | |
942 | c->type = SSH_CHANNEL_OPEN; | |
d7ac5f18 | 943 | debug2("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate); |
7368a6c8 | 944 | } |
945 | } | |
5260325f | 946 | |
28b9cb4d | 947 | /* try to decode a socks4 header */ |
ebb90778 | 948 | /* ARGSUSED */ |
396c147e | 949 | static int |
c8e9c167 | 950 | channel_decode_socks4(Channel *c, fd_set *readset, fd_set *writeset) |
0490e609 | 951 | { |
661e45a0 | 952 | char *p, *host; |
2ceb8101 | 953 | u_int len, have, i, found; |
184eed6a | 954 | char username[256]; |
0490e609 | 955 | struct { |
956 | u_int8_t version; | |
957 | u_int8_t command; | |
958 | u_int16_t dest_port; | |
28b9cb4d | 959 | struct in_addr dest_addr; |
0490e609 | 960 | } s4_req, s4_rsp; |
961 | ||
28b9cb4d | 962 | debug2("channel %d: decode socks4", c->self); |
53b8fe68 | 963 | |
964 | have = buffer_len(&c->input); | |
965 | len = sizeof(s4_req); | |
966 | if (have < len) | |
967 | return 0; | |
968 | p = buffer_ptr(&c->input); | |
969 | for (found = 0, i = len; i < have; i++) { | |
970 | if (p[i] == '\0') { | |
971 | found = 1; | |
972 | break; | |
973 | } | |
974 | if (i > 1024) { | |
975 | /* the peer is probably sending garbage */ | |
976 | debug("channel %d: decode socks4: too long", | |
977 | c->self); | |
978 | return -1; | |
979 | } | |
980 | } | |
981 | if (!found) | |
982 | return 0; | |
0490e609 | 983 | buffer_get(&c->input, (char *)&s4_req.version, 1); |
984 | buffer_get(&c->input, (char *)&s4_req.command, 1); | |
985 | buffer_get(&c->input, (char *)&s4_req.dest_port, 2); | |
28b9cb4d | 986 | buffer_get(&c->input, (char *)&s4_req.dest_addr, 4); |
53b8fe68 | 987 | have = buffer_len(&c->input); |
0490e609 | 988 | p = buffer_ptr(&c->input); |
989 | len = strlen(p); | |
6683b40f | 990 | debug2("channel %d: decode socks4: user %s/%d", c->self, p, len); |
0490e609 | 991 | if (len > have) |
28b9cb4d | 992 | fatal("channel %d: decode socks4: len %d > have %d", |
0490e609 | 993 | c->self, len, have); |
994 | strlcpy(username, p, sizeof(username)); | |
995 | buffer_consume(&c->input, len); | |
996 | buffer_consume(&c->input, 1); /* trailing '\0' */ | |
997 | ||
28b9cb4d | 998 | host = inet_ntoa(s4_req.dest_addr); |
0490e609 | 999 | strlcpy(c->path, host, sizeof(c->path)); |
1000 | c->host_port = ntohs(s4_req.dest_port); | |
184eed6a | 1001 | |
d7ac5f18 | 1002 | debug2("channel %d: dynamic request: socks4 host %s port %u command %u", |
6683b40f | 1003 | c->self, host, c->host_port, s4_req.command); |
0490e609 | 1004 | |
28b9cb4d | 1005 | if (s4_req.command != 1) { |
1006 | debug("channel %d: cannot handle: socks4 cn %d", | |
1007 | c->self, s4_req.command); | |
1008 | return -1; | |
0490e609 | 1009 | } |
28b9cb4d | 1010 | s4_rsp.version = 0; /* vn: 0 for reply */ |
1011 | s4_rsp.command = 90; /* cd: req granted */ | |
0490e609 | 1012 | s4_rsp.dest_port = 0; /* ignored */ |
28b9cb4d | 1013 | s4_rsp.dest_addr.s_addr = INADDR_ANY; /* ignored */ |
15dd2c4f | 1014 | buffer_append(&c->output, &s4_rsp, sizeof(s4_rsp)); |
28b9cb4d | 1015 | return 1; |
0490e609 | 1016 | } |
1017 | ||
f49658f5 | 1018 | /* try to decode a socks5 header */ |
1019 | #define SSH_SOCKS5_AUTHDONE 0x1000 | |
1020 | #define SSH_SOCKS5_NOAUTH 0x00 | |
1021 | #define SSH_SOCKS5_IPV4 0x01 | |
1022 | #define SSH_SOCKS5_DOMAIN 0x03 | |
1023 | #define SSH_SOCKS5_IPV6 0x04 | |
1024 | #define SSH_SOCKS5_CONNECT 0x01 | |
1025 | #define SSH_SOCKS5_SUCCESS 0x00 | |
1026 | ||
ebb90778 | 1027 | /* ARGSUSED */ |
f49658f5 | 1028 | static int |
c8e9c167 | 1029 | channel_decode_socks5(Channel *c, fd_set *readset, fd_set *writeset) |
f49658f5 | 1030 | { |
1031 | struct { | |
1032 | u_int8_t version; | |
1033 | u_int8_t command; | |
1034 | u_int8_t reserved; | |
1035 | u_int8_t atyp; | |
1036 | } s5_req, s5_rsp; | |
1037 | u_int16_t dest_port; | |
1038 | u_char *p, dest_addr[255+1]; | |
a217e418 | 1039 | u_int have, need, i, found, nmethods, addrlen, af; |
f49658f5 | 1040 | |
1041 | debug2("channel %d: decode socks5", c->self); | |
1042 | p = buffer_ptr(&c->input); | |
1043 | if (p[0] != 0x05) | |
1044 | return -1; | |
1045 | have = buffer_len(&c->input); | |
1046 | if (!(c->flags & SSH_SOCKS5_AUTHDONE)) { | |
1047 | /* format: ver | nmethods | methods */ | |
aff51935 | 1048 | if (have < 2) |
f49658f5 | 1049 | return 0; |
1050 | nmethods = p[1]; | |
1051 | if (have < nmethods + 2) | |
1052 | return 0; | |
1053 | /* look for method: "NO AUTHENTICATION REQUIRED" */ | |
1054 | for (found = 0, i = 2 ; i < nmethods + 2; i++) { | |
1055 | if (p[i] == SSH_SOCKS5_NOAUTH ) { | |
1056 | found = 1; | |
1057 | break; | |
1058 | } | |
1059 | } | |
1060 | if (!found) { | |
1061 | debug("channel %d: method SSH_SOCKS5_NOAUTH not found", | |
1062 | c->self); | |
1063 | return -1; | |
1064 | } | |
1065 | buffer_consume(&c->input, nmethods + 2); | |
1066 | buffer_put_char(&c->output, 0x05); /* version */ | |
1067 | buffer_put_char(&c->output, SSH_SOCKS5_NOAUTH); /* method */ | |
1068 | FD_SET(c->sock, writeset); | |
1069 | c->flags |= SSH_SOCKS5_AUTHDONE; | |
1070 | debug2("channel %d: socks5 auth done", c->self); | |
1071 | return 0; /* need more */ | |
1072 | } | |
1073 | debug2("channel %d: socks5 post auth", c->self); | |
1074 | if (have < sizeof(s5_req)+1) | |
1075 | return 0; /* need more */ | |
5b5f6af7 | 1076 | memcpy(&s5_req, p, sizeof(s5_req)); |
f49658f5 | 1077 | if (s5_req.version != 0x05 || |
1078 | s5_req.command != SSH_SOCKS5_CONNECT || | |
1079 | s5_req.reserved != 0x00) { | |
d7ac5f18 | 1080 | debug2("channel %d: only socks5 connect supported", c->self); |
f49658f5 | 1081 | return -1; |
1082 | } | |
f8cc7664 | 1083 | switch (s5_req.atyp){ |
f49658f5 | 1084 | case SSH_SOCKS5_IPV4: |
1085 | addrlen = 4; | |
1086 | af = AF_INET; | |
1087 | break; | |
1088 | case SSH_SOCKS5_DOMAIN: | |
1089 | addrlen = p[sizeof(s5_req)]; | |
1090 | af = -1; | |
1091 | break; | |
1092 | case SSH_SOCKS5_IPV6: | |
1093 | addrlen = 16; | |
1094 | af = AF_INET6; | |
1095 | break; | |
1096 | default: | |
d7ac5f18 | 1097 | debug2("channel %d: bad socks5 atyp %d", c->self, s5_req.atyp); |
f49658f5 | 1098 | return -1; |
1099 | } | |
a217e418 | 1100 | need = sizeof(s5_req) + addrlen + 2; |
1101 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) | |
1102 | need++; | |
1103 | if (have < need) | |
f49658f5 | 1104 | return 0; |
1105 | buffer_consume(&c->input, sizeof(s5_req)); | |
1106 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) | |
1107 | buffer_consume(&c->input, 1); /* host string length */ | |
1108 | buffer_get(&c->input, (char *)&dest_addr, addrlen); | |
1109 | buffer_get(&c->input, (char *)&dest_port, 2); | |
1110 | dest_addr[addrlen] = '\0'; | |
1111 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) | |
f6be21a0 | 1112 | strlcpy(c->path, (char *)dest_addr, sizeof(c->path)); |
f49658f5 | 1113 | else if (inet_ntop(af, dest_addr, c->path, sizeof(c->path)) == NULL) |
1114 | return -1; | |
1115 | c->host_port = ntohs(dest_port); | |
b6453d99 | 1116 | |
d7ac5f18 | 1117 | debug2("channel %d: dynamic request: socks5 host %s port %u command %u", |
f49658f5 | 1118 | c->self, c->path, c->host_port, s5_req.command); |
1119 | ||
1120 | s5_rsp.version = 0x05; | |
1121 | s5_rsp.command = SSH_SOCKS5_SUCCESS; | |
1122 | s5_rsp.reserved = 0; /* ignored */ | |
1123 | s5_rsp.atyp = SSH_SOCKS5_IPV4; | |
1124 | ((struct in_addr *)&dest_addr)->s_addr = INADDR_ANY; | |
1125 | dest_port = 0; /* ignored */ | |
1126 | ||
15dd2c4f | 1127 | buffer_append(&c->output, &s5_rsp, sizeof(s5_rsp)); |
1128 | buffer_append(&c->output, &dest_addr, sizeof(struct in_addr)); | |
1129 | buffer_append(&c->output, &dest_port, sizeof(dest_port)); | |
f49658f5 | 1130 | return 1; |
1131 | } | |
1132 | ||
28b9cb4d | 1133 | /* dynamic port forwarding */ |
396c147e | 1134 | static void |
c8e9c167 | 1135 | channel_pre_dynamic(Channel *c, fd_set *readset, fd_set *writeset) |
28b9cb4d | 1136 | { |
1137 | u_char *p; | |
2ceb8101 | 1138 | u_int have; |
1139 | int ret; | |
28b9cb4d | 1140 | |
1141 | have = buffer_len(&c->input); | |
639cb8ab | 1142 | c->delayed = 0; |
28b9cb4d | 1143 | debug2("channel %d: pre_dynamic: have %d", c->self, have); |
070adba2 | 1144 | /* buffer_dump(&c->input); */ |
28b9cb4d | 1145 | /* check if the fixed size part of the packet is in buffer. */ |
f49658f5 | 1146 | if (have < 3) { |
28b9cb4d | 1147 | /* need more */ |
1148 | FD_SET(c->sock, readset); | |
1149 | return; | |
1150 | } | |
1151 | /* try to guess the protocol */ | |
1152 | p = buffer_ptr(&c->input); | |
1153 | switch (p[0]) { | |
6683b40f | 1154 | case 0x04: |
1155 | ret = channel_decode_socks4(c, readset, writeset); | |
1156 | break; | |
f49658f5 | 1157 | case 0x05: |
1158 | ret = channel_decode_socks5(c, readset, writeset); | |
1159 | break; | |
28b9cb4d | 1160 | default: |
1161 | ret = -1; | |
1162 | break; | |
1163 | } | |
1164 | if (ret < 0) { | |
719fc62f | 1165 | chan_mark_dead(c); |
28b9cb4d | 1166 | } else if (ret == 0) { |
1167 | debug2("channel %d: pre_dynamic: need more", c->self); | |
1168 | /* need more */ | |
1169 | FD_SET(c->sock, readset); | |
1170 | } else { | |
1171 | /* switch to the next state */ | |
1172 | c->type = SSH_CHANNEL_OPENING; | |
1173 | port_open_helper(c, "direct-tcpip"); | |
1174 | } | |
1175 | } | |
0490e609 | 1176 | |
7368a6c8 | 1177 | /* This is our fake X11 server socket. */ |
ebb90778 | 1178 | /* ARGSUSED */ |
396c147e | 1179 | static void |
c8e9c167 | 1180 | channel_post_x11_listener(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1181 | { |
719fc62f | 1182 | Channel *nc; |
7368a6c8 | 1183 | struct sockaddr addr; |
bcc0381e | 1184 | int newsock; |
7368a6c8 | 1185 | socklen_t addrlen; |
865ac82e | 1186 | char buf[16384], *remote_ipaddr; |
0b242b12 | 1187 | int remote_port; |
7368a6c8 | 1188 | |
1189 | if (FD_ISSET(c->sock, readset)) { | |
1190 | debug("X11 connection requested."); | |
1191 | addrlen = sizeof(addr); | |
1192 | newsock = accept(c->sock, &addr, &addrlen); | |
ac151b18 | 1193 | if (c->single_connection) { |
d7ac5f18 | 1194 | debug2("single_connection: closing X11 listener."); |
ac151b18 | 1195 | channel_close_fd(&c->sock); |
1196 | chan_mark_dead(c); | |
1197 | } | |
7368a6c8 | 1198 | if (newsock < 0) { |
1199 | error("accept: %.100s", strerror(errno)); | |
1200 | return; | |
5260325f | 1201 | } |
bcc0381e | 1202 | set_nodelay(newsock); |
865ac82e | 1203 | remote_ipaddr = get_peer_ipaddr(newsock); |
0b242b12 | 1204 | remote_port = get_peer_port(newsock); |
7368a6c8 | 1205 | snprintf(buf, sizeof buf, "X11 connection from %.200s port %d", |
865ac82e | 1206 | remote_ipaddr, remote_port); |
0b242b12 | 1207 | |
719fc62f | 1208 | nc = channel_new("accepted x11 socket", |
0b242b12 | 1209 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
0d942eff | 1210 | c->local_window_max, c->local_maxpacket, 0, buf, 1); |
0b242b12 | 1211 | if (compat20) { |
1212 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1213 | packet_put_cstring("x11"); | |
719fc62f | 1214 | packet_put_int(nc->self); |
ac151b18 | 1215 | packet_put_int(nc->local_window_max); |
1216 | packet_put_int(nc->local_maxpacket); | |
865ac82e | 1217 | /* originator ipaddr and port */ |
1218 | packet_put_cstring(remote_ipaddr); | |
d0c832f3 | 1219 | if (datafellows & SSH_BUG_X11FWD) { |
d7ac5f18 | 1220 | debug2("ssh2 x11 bug compat mode"); |
d0c832f3 | 1221 | } else { |
1222 | packet_put_int(remote_port); | |
1223 | } | |
0b242b12 | 1224 | packet_send(); |
1225 | } else { | |
1226 | packet_start(SSH_SMSG_X11_OPEN); | |
719fc62f | 1227 | packet_put_int(nc->self); |
8e7895b8 | 1228 | if (packet_get_protocol_flags() & |
1229 | SSH_PROTOFLAG_HOST_IN_FWD_OPEN) | |
449c5ba5 | 1230 | packet_put_cstring(buf); |
0b242b12 | 1231 | packet_send(); |
1232 | } | |
865ac82e | 1233 | xfree(remote_ipaddr); |
8efc0c15 | 1234 | } |
8efc0c15 | 1235 | } |
1236 | ||
396c147e | 1237 | static void |
0490e609 | 1238 | port_open_helper(Channel *c, char *rtype) |
1239 | { | |
1240 | int direct; | |
1241 | char buf[1024]; | |
1242 | char *remote_ipaddr = get_peer_ipaddr(c->sock); | |
29798ed0 | 1243 | int remote_port = get_peer_port(c->sock); |
0490e609 | 1244 | |
1245 | direct = (strcmp(rtype, "direct-tcpip") == 0); | |
1246 | ||
1247 | snprintf(buf, sizeof buf, | |
1248 | "%s: listening port %d for %.100s port %d, " | |
1249 | "connect from %.200s port %d", | |
1250 | rtype, c->listening_port, c->path, c->host_port, | |
1251 | remote_ipaddr, remote_port); | |
1252 | ||
1253 | xfree(c->remote_name); | |
1254 | c->remote_name = xstrdup(buf); | |
1255 | ||
1256 | if (compat20) { | |
1257 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1258 | packet_put_cstring(rtype); | |
1259 | packet_put_int(c->self); | |
1260 | packet_put_int(c->local_window_max); | |
1261 | packet_put_int(c->local_maxpacket); | |
1262 | if (direct) { | |
1263 | /* target host, port */ | |
1264 | packet_put_cstring(c->path); | |
1265 | packet_put_int(c->host_port); | |
1266 | } else { | |
1267 | /* listen address, port */ | |
1268 | packet_put_cstring(c->path); | |
1269 | packet_put_int(c->listening_port); | |
1270 | } | |
1271 | /* originator host and port */ | |
1272 | packet_put_cstring(remote_ipaddr); | |
29798ed0 | 1273 | packet_put_int((u_int)remote_port); |
0490e609 | 1274 | packet_send(); |
1275 | } else { | |
1276 | packet_start(SSH_MSG_PORT_OPEN); | |
1277 | packet_put_int(c->self); | |
1278 | packet_put_cstring(c->path); | |
1279 | packet_put_int(c->host_port); | |
8e7895b8 | 1280 | if (packet_get_protocol_flags() & |
1281 | SSH_PROTOFLAG_HOST_IN_FWD_OPEN) | |
0490e609 | 1282 | packet_put_cstring(c->remote_name); |
1283 | packet_send(); | |
1284 | } | |
1285 | xfree(remote_ipaddr); | |
1286 | } | |
1287 | ||
442aee3a | 1288 | static void |
1289 | channel_set_reuseaddr(int fd) | |
1290 | { | |
1291 | int on = 1; | |
1292 | ||
1293 | /* | |
1294 | * Set socket options. | |
1295 | * Allow local port reuse in TIME_WAIT. | |
1296 | */ | |
1297 | if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1) | |
1298 | error("setsockopt SO_REUSEADDR fd %d: %s", fd, strerror(errno)); | |
1299 | } | |
1300 | ||
aa3378df | 1301 | /* |
7368a6c8 | 1302 | * This socket is listening for connections to a forwarded TCP/IP port. |
aa3378df | 1303 | */ |
ebb90778 | 1304 | /* ARGSUSED */ |
396c147e | 1305 | static void |
c8e9c167 | 1306 | channel_post_port_listener(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1307 | { |
0490e609 | 1308 | Channel *nc; |
7368a6c8 | 1309 | struct sockaddr addr; |
719fc62f | 1310 | int newsock, nextstate; |
7368a6c8 | 1311 | socklen_t addrlen; |
0490e609 | 1312 | char *rtype; |
fa08c86b | 1313 | |
7368a6c8 | 1314 | if (FD_ISSET(c->sock, readset)) { |
1315 | debug("Connection to port %d forwarding " | |
1316 | "to %.100s port %d requested.", | |
1317 | c->listening_port, c->path, c->host_port); | |
0490e609 | 1318 | |
639cb8ab | 1319 | if (c->type == SSH_CHANNEL_RPORT_LISTENER) { |
1320 | nextstate = SSH_CHANNEL_OPENING; | |
1321 | rtype = "forwarded-tcpip"; | |
1322 | } else { | |
1323 | if (c->host_port == 0) { | |
1324 | nextstate = SSH_CHANNEL_DYNAMIC; | |
f3964cb9 | 1325 | rtype = "dynamic-tcpip"; |
639cb8ab | 1326 | } else { |
1327 | nextstate = SSH_CHANNEL_OPENING; | |
1328 | rtype = "direct-tcpip"; | |
1329 | } | |
1330 | } | |
0490e609 | 1331 | |
7368a6c8 | 1332 | addrlen = sizeof(addr); |
1333 | newsock = accept(c->sock, &addr, &addrlen); | |
1334 | if (newsock < 0) { | |
1335 | error("accept: %.100s", strerror(errno)); | |
1336 | return; | |
1337 | } | |
811a6342 | 1338 | set_nodelay(newsock); |
0d942eff | 1339 | nc = channel_new(rtype, nextstate, newsock, newsock, -1, |
1340 | c->local_window_max, c->local_maxpacket, 0, rtype, 1); | |
0490e609 | 1341 | nc->listening_port = c->listening_port; |
1342 | nc->host_port = c->host_port; | |
1343 | strlcpy(nc->path, c->path, sizeof(nc->path)); | |
1344 | ||
639cb8ab | 1345 | if (nextstate == SSH_CHANNEL_DYNAMIC) { |
1346 | /* | |
1347 | * do not call the channel_post handler until | |
1348 | * this flag has been reset by a pre-handler. | |
1349 | * otherwise the FD_ISSET calls might overflow | |
1350 | */ | |
1351 | nc->delayed = 1; | |
1352 | } else { | |
0490e609 | 1353 | port_open_helper(nc, rtype); |
639cb8ab | 1354 | } |
7368a6c8 | 1355 | } |
1356 | } | |
8efc0c15 | 1357 | |
7368a6c8 | 1358 | /* |
1359 | * This is the authentication agent socket listening for connections from | |
1360 | * clients. | |
1361 | */ | |
ebb90778 | 1362 | /* ARGSUSED */ |
396c147e | 1363 | static void |
c8e9c167 | 1364 | channel_post_auth_listener(Channel *c, fd_set *readset, fd_set *writeset) |
8efc0c15 | 1365 | { |
719fc62f | 1366 | Channel *nc; |
1367 | int newsock; | |
5260325f | 1368 | struct sockaddr addr; |
48e671d5 | 1369 | socklen_t addrlen; |
5260325f | 1370 | |
7368a6c8 | 1371 | if (FD_ISSET(c->sock, readset)) { |
1372 | addrlen = sizeof(addr); | |
1373 | newsock = accept(c->sock, &addr, &addrlen); | |
1374 | if (newsock < 0) { | |
1375 | error("accept from auth socket: %.100s", strerror(errno)); | |
1376 | return; | |
1377 | } | |
719fc62f | 1378 | nc = channel_new("accepted auth socket", |
fa08c86b | 1379 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
1380 | c->local_window_max, c->local_maxpacket, | |
0d942eff | 1381 | 0, "accepted auth socket", 1); |
fa08c86b | 1382 | if (compat20) { |
1383 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1384 | packet_put_cstring("auth-agent@openssh.com"); | |
719fc62f | 1385 | packet_put_int(nc->self); |
fa08c86b | 1386 | packet_put_int(c->local_window_max); |
1387 | packet_put_int(c->local_maxpacket); | |
1388 | } else { | |
1389 | packet_start(SSH_SMSG_AGENT_OPEN); | |
719fc62f | 1390 | packet_put_int(nc->self); |
fa08c86b | 1391 | } |
7368a6c8 | 1392 | packet_send(); |
1393 | } | |
1394 | } | |
5260325f | 1395 | |
ebb90778 | 1396 | /* ARGSUSED */ |
396c147e | 1397 | static void |
c8e9c167 | 1398 | channel_post_connecting(Channel *c, fd_set *readset, fd_set *writeset) |
97fb6912 | 1399 | { |
d18e0850 | 1400 | int err = 0; |
8ab2cb35 | 1401 | socklen_t sz = sizeof(err); |
d18e0850 | 1402 | |
97fb6912 | 1403 | if (FD_ISSET(c->sock, writeset)) { |
db518d9b | 1404 | if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, &err, &sz) < 0) { |
d18e0850 | 1405 | err = errno; |
1406 | error("getsockopt SO_ERROR failed"); | |
1407 | } | |
1408 | if (err == 0) { | |
1409 | debug("channel %d: connected", c->self); | |
1410 | c->type = SSH_CHANNEL_OPEN; | |
1411 | if (compat20) { | |
1412 | packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1413 | packet_put_int(c->remote_id); | |
1414 | packet_put_int(c->self); | |
1415 | packet_put_int(c->local_window); | |
1416 | packet_put_int(c->local_maxpacket); | |
1417 | } else { | |
1418 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1419 | packet_put_int(c->remote_id); | |
1420 | packet_put_int(c->self); | |
1421 | } | |
97fb6912 | 1422 | } else { |
d18e0850 | 1423 | debug("channel %d: not connected: %s", |
1424 | c->self, strerror(err)); | |
1425 | if (compat20) { | |
1426 | packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); | |
1427 | packet_put_int(c->remote_id); | |
1428 | packet_put_int(SSH2_OPEN_CONNECT_FAILED); | |
1429 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { | |
1430 | packet_put_cstring(strerror(err)); | |
1431 | packet_put_cstring(""); | |
1432 | } | |
97fb6912 | 1433 | } else { |
d18e0850 | 1434 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
1435 | packet_put_int(c->remote_id); | |
97fb6912 | 1436 | } |
d18e0850 | 1437 | chan_mark_dead(c); |
97fb6912 | 1438 | } |
d18e0850 | 1439 | packet_send(); |
97fb6912 | 1440 | } |
1441 | } | |
1442 | ||
ebb90778 | 1443 | /* ARGSUSED */ |
396c147e | 1444 | static int |
c8e9c167 | 1445 | channel_handle_rfd(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1446 | { |
fa1d7d85 | 1447 | char buf[CHAN_RBUF]; |
7368a6c8 | 1448 | int len; |
1449 | ||
6fd8622b | 1450 | if (c->rfd != -1 && |
7368a6c8 | 1451 | FD_ISSET(c->rfd, readset)) { |
ea8c44d9 | 1452 | errno = 0; |
7368a6c8 | 1453 | len = read(c->rfd, buf, sizeof(buf)); |
0fbe8c74 | 1454 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
1455 | return 1; | |
ea8c44d9 | 1456 | #ifndef PTY_ZEROREAD |
7368a6c8 | 1457 | if (len <= 0) { |
ea8c44d9 | 1458 | #else |
9c04d67d | 1459 | if ((!c->isatty && len <= 0) || |
1460 | (c->isatty && (len < 0 || (len == 0 && errno != 0)))) { | |
ea8c44d9 | 1461 | #endif |
d7ac5f18 | 1462 | debug2("channel %d: read<=0 rfd %d len %d", |
7368a6c8 | 1463 | c->self, c->rfd, len); |
28b9cb4d | 1464 | if (c->type != SSH_CHANNEL_OPEN) { |
d7ac5f18 | 1465 | debug2("channel %d: not open", c->self); |
719fc62f | 1466 | chan_mark_dead(c); |
0490e609 | 1467 | return -1; |
28b9cb4d | 1468 | } else if (compat13) { |
9c50edcf | 1469 | buffer_clear(&c->output); |
7368a6c8 | 1470 | c->type = SSH_CHANNEL_INPUT_DRAINING; |
d7ac5f18 | 1471 | debug2("channel %d: input draining.", c->self); |
7368a6c8 | 1472 | } else { |
1473 | chan_read_failed(c); | |
5260325f | 1474 | } |
7368a6c8 | 1475 | return -1; |
1476 | } | |
6aacefa7 | 1477 | if (c->input_filter != NULL) { |
2e73a022 | 1478 | if (c->input_filter(c, buf, len) == -1) { |
d7ac5f18 | 1479 | debug2("channel %d: filter stops", c->self); |
2e73a022 | 1480 | chan_read_failed(c); |
1481 | } | |
d20f3c9e | 1482 | } else if (c->datagram) { |
1483 | buffer_put_string(&c->input, buf, len); | |
2e73a022 | 1484 | } else { |
1485 | buffer_append(&c->input, buf, len); | |
1486 | } | |
7368a6c8 | 1487 | } |
1488 | return 1; | |
1489 | } | |
a7137f6b | 1490 | |
ebb90778 | 1491 | /* ARGSUSED */ |
396c147e | 1492 | static int |
c8e9c167 | 1493 | channel_handle_wfd(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1494 | { |
95ce5599 | 1495 | struct termios tio; |
c1c6a032 | 1496 | u_char *data = NULL, *buf; |
780a9951 | 1497 | u_int dlen; |
7368a6c8 | 1498 | int len; |
1499 | ||
1500 | /* Send buffered output data to the socket. */ | |
6fd8622b | 1501 | if (c->wfd != -1 && |
7368a6c8 | 1502 | FD_ISSET(c->wfd, writeset) && |
1503 | buffer_len(&c->output) > 0) { | |
c1c6a032 | 1504 | if (c->output_filter != NULL) { |
1505 | if ((buf = c->output_filter(c, &data, &dlen)) == NULL) { | |
1506 | debug2("channel %d: filter stops", c->self); | |
d7b37427 | 1507 | if (c->type != SSH_CHANNEL_OPEN) |
1508 | chan_mark_dead(c); | |
1509 | else | |
1510 | chan_write_failed(c); | |
1511 | return -1; | |
c1c6a032 | 1512 | } |
1513 | } else if (c->datagram) { | |
1514 | buf = data = buffer_get_string(&c->output, &dlen); | |
1515 | } else { | |
1516 | buf = data = buffer_ptr(&c->output); | |
1517 | dlen = buffer_len(&c->output); | |
1518 | } | |
1519 | ||
d20f3c9e | 1520 | if (c->datagram) { |
d20f3c9e | 1521 | /* ignore truncated writes, datagrams might get lost */ |
1522 | c->local_consumed += dlen + 4; | |
c1c6a032 | 1523 | len = write(c->wfd, buf, dlen); |
d20f3c9e | 1524 | xfree(data); |
1525 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) | |
1526 | return 1; | |
1527 | if (len <= 0) { | |
1528 | if (c->type != SSH_CHANNEL_OPEN) | |
1529 | chan_mark_dead(c); | |
1530 | else | |
1531 | chan_write_failed(c); | |
1532 | return -1; | |
1533 | } | |
1534 | return 1; | |
1535 | } | |
64c0ce80 | 1536 | #ifdef _AIX |
aff51935 | 1537 | /* XXX: Later AIX versions can't push as much data to tty */ |
7fbb4189 | 1538 | if (compat20 && c->wfd_isatty) |
1539 | dlen = MIN(dlen, 8*1024); | |
64c0ce80 | 1540 | #endif |
c1c6a032 | 1541 | |
1542 | len = write(c->wfd, buf, dlen); | |
0fbe8c74 | 1543 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
1544 | return 1; | |
7368a6c8 | 1545 | if (len <= 0) { |
28b9cb4d | 1546 | if (c->type != SSH_CHANNEL_OPEN) { |
d7ac5f18 | 1547 | debug2("channel %d: not open", c->self); |
719fc62f | 1548 | chan_mark_dead(c); |
28b9cb4d | 1549 | return -1; |
1550 | } else if (compat13) { | |
9c50edcf | 1551 | buffer_clear(&c->output); |
d7ac5f18 | 1552 | debug2("channel %d: input draining.", c->self); |
7368a6c8 | 1553 | c->type = SSH_CHANNEL_INPUT_DRAINING; |
1554 | } else { | |
1555 | chan_write_failed(c); | |
5260325f | 1556 | } |
7368a6c8 | 1557 | return -1; |
1558 | } | |
c1c6a032 | 1559 | if (compat20 && c->isatty && dlen >= 1 && buf[0] != '\r') { |
0ae4fe1d | 1560 | if (tcgetattr(c->wfd, &tio) == 0 && |
1561 | !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) { | |
1562 | /* | |
1563 | * Simulate echo to reduce the impact of | |
355724fc | 1564 | * traffic analysis. We need to match the |
95ce5599 | 1565 | * size of a SSH2_MSG_CHANNEL_DATA message |
c1c6a032 | 1566 | * (4 byte channel id + buf) |
0ae4fe1d | 1567 | */ |
95ce5599 | 1568 | packet_send_ignore(4 + len); |
0ae4fe1d | 1569 | packet_send(); |
0ae4fe1d | 1570 | } |
1571 | } | |
7368a6c8 | 1572 | buffer_consume(&c->output, len); |
7e7327a1 | 1573 | if (compat20 && len > 0) { |
1574 | c->local_consumed += len; | |
1575 | } | |
1576 | } | |
1577 | return 1; | |
1578 | } | |
a7137f6b | 1579 | |
396c147e | 1580 | static int |
c8e9c167 | 1581 | channel_handle_efd(Channel *c, fd_set *readset, fd_set *writeset) |
7e7327a1 | 1582 | { |
fa1d7d85 | 1583 | char buf[CHAN_RBUF]; |
7e7327a1 | 1584 | int len; |
1585 | ||
8ce64345 | 1586 | /** XXX handle drain efd, too */ |
7e7327a1 | 1587 | if (c->efd != -1) { |
1588 | if (c->extended_usage == CHAN_EXTENDED_WRITE && | |
1589 | FD_ISSET(c->efd, writeset) && | |
1590 | buffer_len(&c->extended) > 0) { | |
1591 | len = write(c->efd, buffer_ptr(&c->extended), | |
1592 | buffer_len(&c->extended)); | |
de273eef | 1593 | debug2("channel %d: written %d to efd %d", |
7e7327a1 | 1594 | c->self, len, c->efd); |
ee55dacf | 1595 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
1596 | return 1; | |
1597 | if (len <= 0) { | |
1598 | debug2("channel %d: closing write-efd %d", | |
1599 | c->self, c->efd); | |
489aa2e9 | 1600 | channel_close_fd(&c->efd); |
ee55dacf | 1601 | } else { |
7e7327a1 | 1602 | buffer_consume(&c->extended, len); |
1603 | c->local_consumed += len; | |
1604 | } | |
1605 | } else if (c->extended_usage == CHAN_EXTENDED_READ && | |
1606 | FD_ISSET(c->efd, readset)) { | |
1607 | len = read(c->efd, buf, sizeof(buf)); | |
de273eef | 1608 | debug2("channel %d: read %d from efd %d", |
184eed6a | 1609 | c->self, len, c->efd); |
ee55dacf | 1610 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
1611 | return 1; | |
1612 | if (len <= 0) { | |
1613 | debug2("channel %d: closing read-efd %d", | |
8ce64345 | 1614 | c->self, c->efd); |
489aa2e9 | 1615 | channel_close_fd(&c->efd); |
ee55dacf | 1616 | } else { |
7e7327a1 | 1617 | buffer_append(&c->extended, buf, len); |
ee55dacf | 1618 | } |
7e7327a1 | 1619 | } |
1620 | } | |
1621 | return 1; | |
1622 | } | |
a7137f6b | 1623 | |
ebb90778 | 1624 | /* ARGSUSED */ |
396c147e | 1625 | static int |
c8e9c167 | 1626 | channel_handle_ctl(Channel *c, fd_set *readset, fd_set *writeset) |
5e96b616 | 1627 | { |
1628 | char buf[16]; | |
1629 | int len; | |
1630 | ||
1631 | /* Monitor control fd to detect if the slave client exits */ | |
1632 | if (c->ctl_fd != -1 && FD_ISSET(c->ctl_fd, readset)) { | |
1633 | len = read(c->ctl_fd, buf, sizeof(buf)); | |
1634 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) | |
1635 | return 1; | |
1636 | if (len <= 0) { | |
1637 | debug2("channel %d: ctl read<=0", c->self); | |
1638 | if (c->type != SSH_CHANNEL_OPEN) { | |
1639 | debug2("channel %d: not open", c->self); | |
1640 | chan_mark_dead(c); | |
1641 | return -1; | |
1642 | } else { | |
1643 | chan_read_failed(c); | |
1644 | chan_write_failed(c); | |
1645 | } | |
1646 | return -1; | |
1647 | } else | |
1648 | fatal("%s: unexpected data on ctl fd", __func__); | |
1649 | } | |
1650 | return 1; | |
1651 | } | |
a7137f6b | 1652 | |
5e96b616 | 1653 | static int |
ee55dacf | 1654 | channel_check_window(Channel *c) |
7e7327a1 | 1655 | { |
28b9cb4d | 1656 | if (c->type == SSH_CHANNEL_OPEN && |
1657 | !(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) && | |
7e7327a1 | 1658 | c->local_window < c->local_window_max/2 && |
1659 | c->local_consumed > 0) { | |
1660 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); | |
1661 | packet_put_int(c->remote_id); | |
1662 | packet_put_int(c->local_consumed); | |
1663 | packet_send(); | |
de273eef | 1664 | debug2("channel %d: window %d sent adjust %d", |
7e7327a1 | 1665 | c->self, c->local_window, |
1666 | c->local_consumed); | |
1667 | c->local_window += c->local_consumed; | |
1668 | c->local_consumed = 0; | |
7368a6c8 | 1669 | } |
1670 | return 1; | |
1671 | } | |
5260325f | 1672 | |
396c147e | 1673 | static void |
c8e9c167 | 1674 | channel_post_open(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1675 | { |
639cb8ab | 1676 | if (c->delayed) |
1677 | return; | |
7368a6c8 | 1678 | channel_handle_rfd(c, readset, writeset); |
1679 | channel_handle_wfd(c, readset, writeset); | |
0c0738d5 | 1680 | if (!compat20) |
639cb8ab | 1681 | return; |
7e7327a1 | 1682 | channel_handle_efd(c, readset, writeset); |
5e96b616 | 1683 | channel_handle_ctl(c, readset, writeset); |
ee55dacf | 1684 | channel_check_window(c); |
7e7327a1 | 1685 | } |
1686 | ||
ebb90778 | 1687 | /* ARGSUSED */ |
396c147e | 1688 | static void |
c8e9c167 | 1689 | channel_post_output_drain_13(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1690 | { |
1691 | int len; | |
e1feb9bf | 1692 | |
7368a6c8 | 1693 | /* Send buffered output data to the socket. */ |
1694 | if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) { | |
1695 | len = write(c->sock, buffer_ptr(&c->output), | |
1696 | buffer_len(&c->output)); | |
1697 | if (len <= 0) | |
9c50edcf | 1698 | buffer_clear(&c->output); |
7368a6c8 | 1699 | else |
1700 | buffer_consume(&c->output, len); | |
1701 | } | |
1702 | } | |
5260325f | 1703 | |
396c147e | 1704 | static void |
7e7327a1 | 1705 | channel_handler_init_20(void) |
1706 | { | |
0c0738d5 | 1707 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open; |
0b242b12 | 1708 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
7e7327a1 | 1709 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; |
fa08c86b | 1710 | channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener; |
0b242b12 | 1711 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
fa08c86b | 1712 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; |
97fb6912 | 1713 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1714 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7e7327a1 | 1715 | |
0c0738d5 | 1716 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
7e7327a1 | 1717 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; |
fa08c86b | 1718 | channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener; |
0b242b12 | 1719 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
fa08c86b | 1720 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; |
97fb6912 | 1721 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 1722 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
7e7327a1 | 1723 | } |
1724 | ||
396c147e | 1725 | static void |
7368a6c8 | 1726 | channel_handler_init_13(void) |
1727 | { | |
1728 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13; | |
1729 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_13; | |
1730 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; | |
1731 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; | |
1732 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; | |
1733 | channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining; | |
1734 | channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining; | |
97fb6912 | 1735 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1736 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7368a6c8 | 1737 | |
0c0738d5 | 1738 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
7368a6c8 | 1739 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
1740 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; | |
1741 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; | |
1742 | channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13; | |
97fb6912 | 1743 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 1744 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
7368a6c8 | 1745 | } |
5260325f | 1746 | |
396c147e | 1747 | static void |
7368a6c8 | 1748 | channel_handler_init_15(void) |
1749 | { | |
0c0738d5 | 1750 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open; |
0b242b12 | 1751 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
7368a6c8 | 1752 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
1753 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; | |
1754 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; | |
97fb6912 | 1755 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1756 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7368a6c8 | 1757 | |
1758 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; | |
1759 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; | |
1760 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; | |
0c0738d5 | 1761 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
97fb6912 | 1762 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 1763 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
7368a6c8 | 1764 | } |
1765 | ||
396c147e | 1766 | static void |
7368a6c8 | 1767 | channel_handler_init(void) |
1768 | { | |
1769 | int i; | |
e1feb9bf | 1770 | |
184eed6a | 1771 | for (i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) { |
7368a6c8 | 1772 | channel_pre[i] = NULL; |
1773 | channel_post[i] = NULL; | |
1774 | } | |
7e7327a1 | 1775 | if (compat20) |
1776 | channel_handler_init_20(); | |
1777 | else if (compat13) | |
7368a6c8 | 1778 | channel_handler_init_13(); |
1779 | else | |
1780 | channel_handler_init_15(); | |
1781 | } | |
1782 | ||
418e724c | 1783 | /* gc dead channels */ |
1784 | static void | |
1785 | channel_garbage_collect(Channel *c) | |
1786 | { | |
1787 | if (c == NULL) | |
1788 | return; | |
1789 | if (c->detach_user != NULL) { | |
8cd0437d | 1790 | if (!chan_is_dead(c, c->detach_close)) |
418e724c | 1791 | return; |
d7ac5f18 | 1792 | debug2("channel %d: gc: notify user", c->self); |
418e724c | 1793 | c->detach_user(c->self, NULL); |
1794 | /* if we still have a callback */ | |
1795 | if (c->detach_user != NULL) | |
1796 | return; | |
d7ac5f18 | 1797 | debug2("channel %d: gc: user detached", c->self); |
418e724c | 1798 | } |
1799 | if (!chan_is_dead(c, 1)) | |
1800 | return; | |
d7ac5f18 | 1801 | debug2("channel %d: garbage collecting", c->self); |
418e724c | 1802 | channel_free(c); |
1803 | } | |
1804 | ||
396c147e | 1805 | static void |
c8e9c167 | 1806 | channel_handler(chan_fn *ftab[], fd_set *readset, fd_set *writeset) |
7368a6c8 | 1807 | { |
1808 | static int did_init = 0; | |
9a995072 | 1809 | u_int i; |
7368a6c8 | 1810 | Channel *c; |
1811 | ||
1812 | if (!did_init) { | |
1813 | channel_handler_init(); | |
1814 | did_init = 1; | |
1815 | } | |
1816 | for (i = 0; i < channels_alloc; i++) { | |
719fc62f | 1817 | c = channels[i]; |
1818 | if (c == NULL) | |
5260325f | 1819 | continue; |
6fd8622b | 1820 | if (ftab[c->type] != NULL) |
1821 | (*ftab[c->type])(c, readset, writeset); | |
418e724c | 1822 | channel_garbage_collect(c); |
8efc0c15 | 1823 | } |
8efc0c15 | 1824 | } |
1825 | ||
8e7895b8 | 1826 | /* |
1827 | * Allocate/update select bitmasks and add any bits relevant to channels in | |
1828 | * select bitmasks. | |
1829 | */ | |
6ae2364d | 1830 | void |
c422989b | 1831 | channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp, |
9a995072 | 1832 | u_int *nallocp, int rekeying) |
7368a6c8 | 1833 | { |
c5d10563 | 1834 | u_int n, sz, nfdset; |
39929cdb | 1835 | |
1836 | n = MAX(*maxfdp, channel_max_fd); | |
1837 | ||
c5d10563 | 1838 | nfdset = howmany(n+1, NFDBITS); |
1839 | /* Explicitly test here, because xrealloc isn't always called */ | |
1840 | if (nfdset && SIZE_T_MAX / nfdset < sizeof(fd_mask)) | |
1841 | fatal("channel_prepare_select: max_fd (%d) is too large", n); | |
1842 | sz = nfdset * sizeof(fd_mask); | |
1843 | ||
489aa2e9 | 1844 | /* perhaps check sz < nalloc/2 and shrink? */ |
1845 | if (*readsetp == NULL || sz > *nallocp) { | |
c5d10563 | 1846 | *readsetp = xrealloc(*readsetp, nfdset, sizeof(fd_mask)); |
1847 | *writesetp = xrealloc(*writesetp, nfdset, sizeof(fd_mask)); | |
489aa2e9 | 1848 | *nallocp = sz; |
39929cdb | 1849 | } |
489aa2e9 | 1850 | *maxfdp = n; |
39929cdb | 1851 | memset(*readsetp, 0, sz); |
1852 | memset(*writesetp, 0, sz); | |
1853 | ||
c422989b | 1854 | if (!rekeying) |
1855 | channel_handler(channel_pre, *readsetp, *writesetp); | |
7368a6c8 | 1856 | } |
1857 | ||
8e7895b8 | 1858 | /* |
1859 | * After select, perform any appropriate operations for channels which have | |
1860 | * events pending. | |
1861 | */ | |
6ae2364d | 1862 | void |
c8e9c167 | 1863 | channel_after_select(fd_set *readset, fd_set *writeset) |
7368a6c8 | 1864 | { |
1865 | channel_handler(channel_post, readset, writeset); | |
1866 | } | |
1867 | ||
8e7895b8 | 1868 | |
39929cdb | 1869 | /* If there is data to send to the connection, enqueue some of it now. */ |
6ae2364d | 1870 | void |
d5bb9418 | 1871 | channel_output_poll(void) |
8efc0c15 | 1872 | { |
7368a6c8 | 1873 | Channel *c; |
9a995072 | 1874 | u_int i, len; |
5260325f | 1875 | |
1876 | for (i = 0; i < channels_alloc; i++) { | |
719fc62f | 1877 | c = channels[i]; |
1878 | if (c == NULL) | |
1879 | continue; | |
48e671d5 | 1880 | |
8e7895b8 | 1881 | /* |
1882 | * We are only interested in channels that can have buffered | |
1883 | * incoming data. | |
1884 | */ | |
48e671d5 | 1885 | if (compat13) { |
7368a6c8 | 1886 | if (c->type != SSH_CHANNEL_OPEN && |
1887 | c->type != SSH_CHANNEL_INPUT_DRAINING) | |
48e671d5 | 1888 | continue; |
1889 | } else { | |
7368a6c8 | 1890 | if (c->type != SSH_CHANNEL_OPEN) |
48e671d5 | 1891 | continue; |
48e671d5 | 1892 | } |
e78a59f5 | 1893 | if (compat20 && |
1894 | (c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) { | |
ee55dacf | 1895 | /* XXX is this true? */ |
418e724c | 1896 | debug3("channel %d: will not send data after close", c->self); |
7e7327a1 | 1897 | continue; |
1898 | } | |
5260325f | 1899 | |
1900 | /* Get the amount of buffered data for this channel. */ | |
ee55dacf | 1901 | if ((c->istate == CHAN_INPUT_OPEN || |
1902 | c->istate == CHAN_INPUT_WAIT_DRAIN) && | |
1903 | (len = buffer_len(&c->input)) > 0) { | |
d20f3c9e | 1904 | if (c->datagram) { |
1905 | if (len > 0) { | |
1906 | u_char *data; | |
1907 | u_int dlen; | |
1908 | ||
1909 | data = buffer_get_string(&c->input, | |
1910 | &dlen); | |
1911 | packet_start(SSH2_MSG_CHANNEL_DATA); | |
1912 | packet_put_int(c->remote_id); | |
1913 | packet_put_string(data, dlen); | |
1914 | packet_send(); | |
1915 | c->remote_window -= dlen + 4; | |
1916 | xfree(data); | |
1917 | } | |
1918 | continue; | |
1919 | } | |
8e7895b8 | 1920 | /* |
1921 | * Send some data for the other side over the secure | |
1922 | * connection. | |
1923 | */ | |
7e7327a1 | 1924 | if (compat20) { |
1925 | if (len > c->remote_window) | |
1926 | len = c->remote_window; | |
1927 | if (len > c->remote_maxpacket) | |
1928 | len = c->remote_maxpacket; | |
5260325f | 1929 | } else { |
7e7327a1 | 1930 | if (packet_is_interactive()) { |
1931 | if (len > 1024) | |
1932 | len = 512; | |
1933 | } else { | |
1934 | /* Keep the packets at reasonable size. */ | |
1935 | if (len > packet_get_maxsize()/2) | |
1936 | len = packet_get_maxsize()/2; | |
1937 | } | |
5260325f | 1938 | } |
7368a6c8 | 1939 | if (len > 0) { |
7e7327a1 | 1940 | packet_start(compat20 ? |
1941 | SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA); | |
7368a6c8 | 1942 | packet_put_int(c->remote_id); |
1943 | packet_put_string(buffer_ptr(&c->input), len); | |
1944 | packet_send(); | |
1945 | buffer_consume(&c->input, len); | |
1946 | c->remote_window -= len; | |
7368a6c8 | 1947 | } |
1948 | } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) { | |
5260325f | 1949 | if (compat13) |
1950 | fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3"); | |
aa3378df | 1951 | /* |
1952 | * input-buffer is empty and read-socket shutdown: | |
d2296ed7 | 1953 | * tell peer, that we will not send more data: send IEOF. |
1954 | * hack for extended data: delay EOF if EFD still in use. | |
aa3378df | 1955 | */ |
d2296ed7 | 1956 | if (CHANNEL_EFD_INPUT_ACTIVE(c)) |
4e2e5cfd | 1957 | debug2("channel %d: ibuf_empty delayed efd %d/(%d)", |
1958 | c->self, c->efd, buffer_len(&c->extended)); | |
d2296ed7 | 1959 | else |
1960 | chan_ibuf_empty(c); | |
5260325f | 1961 | } |
7e7327a1 | 1962 | /* Send extended data, i.e. stderr */ |
1963 | if (compat20 && | |
d2296ed7 | 1964 | !(c->flags & CHAN_EOF_SENT) && |
7e7327a1 | 1965 | c->remote_window > 0 && |
1966 | (len = buffer_len(&c->extended)) > 0 && | |
1967 | c->extended_usage == CHAN_EXTENDED_READ) { | |
f91d9a89 | 1968 | debug2("channel %d: rwin %u elen %u euse %d", |
ee55dacf | 1969 | c->self, c->remote_window, buffer_len(&c->extended), |
1970 | c->extended_usage); | |
7e7327a1 | 1971 | if (len > c->remote_window) |
1972 | len = c->remote_window; | |
1973 | if (len > c->remote_maxpacket) | |
1974 | len = c->remote_maxpacket; | |
1975 | packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA); | |
1976 | packet_put_int(c->remote_id); | |
1977 | packet_put_int(SSH2_EXTENDED_DATA_STDERR); | |
1978 | packet_put_string(buffer_ptr(&c->extended), len); | |
1979 | packet_send(); | |
1980 | buffer_consume(&c->extended, len); | |
1981 | c->remote_window -= len; | |
ee55dacf | 1982 | debug2("channel %d: sent ext data %d", c->self, len); |
7e7327a1 | 1983 | } |
8efc0c15 | 1984 | } |
8efc0c15 | 1985 | } |
1986 | ||
8e7895b8 | 1987 | |
1988 | /* -- protocol input */ | |
04aa9e67 | 1989 | |
1990 | /* ARGSUSED */ | |
6ae2364d | 1991 | void |
7819b5c3 | 1992 | channel_input_data(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 1993 | { |
48e671d5 | 1994 | int id; |
5260325f | 1995 | char *data; |
1e3b8b07 | 1996 | u_int data_len; |
7368a6c8 | 1997 | Channel *c; |
5260325f | 1998 | |
1999 | /* Get the channel number and verify it. */ | |
48e671d5 | 2000 | id = packet_get_int(); |
7368a6c8 | 2001 | c = channel_lookup(id); |
2002 | if (c == NULL) | |
48e671d5 | 2003 | packet_disconnect("Received data for nonexistent channel %d.", id); |
5260325f | 2004 | |
2005 | /* Ignore any data for non-open channels (might happen on close) */ | |
7368a6c8 | 2006 | if (c->type != SSH_CHANNEL_OPEN && |
2007 | c->type != SSH_CHANNEL_X11_OPEN) | |
48e671d5 | 2008 | return; |
2009 | ||
5260325f | 2010 | /* Get the data. */ |
2011 | data = packet_get_string(&data_len); | |
7368a6c8 | 2012 | |
7741e239 | 2013 | /* |
2014 | * Ignore data for protocol > 1.3 if output end is no longer open. | |
2015 | * For protocol 2 the sending side is reducing its window as it sends | |
2016 | * data, so we must 'fake' consumption of the data in order to ensure | |
2017 | * that window updates are sent back. Otherwise the connection might | |
2018 | * deadlock. | |
2019 | */ | |
2020 | if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN) { | |
2021 | if (compat20) { | |
2022 | c->local_window -= data_len; | |
2023 | c->local_consumed += data_len; | |
2024 | } | |
2025 | xfree(data); | |
2026 | return; | |
2027 | } | |
2028 | ||
6aacefa7 | 2029 | if (compat20) { |
7e7327a1 | 2030 | if (data_len > c->local_maxpacket) { |
bbe88b6d | 2031 | logit("channel %d: rcvd big packet %d, maxpack %d", |
7e7327a1 | 2032 | c->self, data_len, c->local_maxpacket); |
2033 | } | |
2034 | if (data_len > c->local_window) { | |
bbe88b6d | 2035 | logit("channel %d: rcvd too much data %d, win %d", |
7e7327a1 | 2036 | c->self, data_len, c->local_window); |
2037 | xfree(data); | |
2038 | return; | |
2039 | } | |
2040 | c->local_window -= data_len; | |
7e7327a1 | 2041 | } |
95500969 | 2042 | packet_check_eom(); |
d20f3c9e | 2043 | if (c->datagram) |
2044 | buffer_put_string(&c->output, data, data_len); | |
2045 | else | |
2046 | buffer_append(&c->output, data, data_len); | |
5260325f | 2047 | xfree(data); |
8efc0c15 | 2048 | } |
8e7895b8 | 2049 | |
04aa9e67 | 2050 | /* ARGSUSED */ |
6ae2364d | 2051 | void |
7819b5c3 | 2052 | channel_input_extended_data(int type, u_int32_t seq, void *ctxt) |
7e7327a1 | 2053 | { |
2054 | int id; | |
7e7327a1 | 2055 | char *data; |
a594fa74 | 2056 | u_int data_len, tcode; |
7e7327a1 | 2057 | Channel *c; |
2058 | ||
2059 | /* Get the channel number and verify it. */ | |
2060 | id = packet_get_int(); | |
2061 | c = channel_lookup(id); | |
2062 | ||
2063 | if (c == NULL) | |
2064 | packet_disconnect("Received extended_data for bad channel %d.", id); | |
2065 | if (c->type != SSH_CHANNEL_OPEN) { | |
bbe88b6d | 2066 | logit("channel %d: ext data for non open", id); |
7e7327a1 | 2067 | return; |
2068 | } | |
d2296ed7 | 2069 | if (c->flags & CHAN_EOF_RCVD) { |
2070 | if (datafellows & SSH_BUG_EXTEOF) | |
2071 | debug("channel %d: accepting ext data after eof", id); | |
2072 | else | |
2073 | packet_disconnect("Received extended_data after EOF " | |
2074 | "on channel %d.", id); | |
2075 | } | |
7e7327a1 | 2076 | tcode = packet_get_int(); |
2077 | if (c->efd == -1 || | |
2078 | c->extended_usage != CHAN_EXTENDED_WRITE || | |
2079 | tcode != SSH2_EXTENDED_DATA_STDERR) { | |
bbe88b6d | 2080 | logit("channel %d: bad ext data", c->self); |
7e7327a1 | 2081 | return; |
2082 | } | |
2083 | data = packet_get_string(&data_len); | |
95500969 | 2084 | packet_check_eom(); |
7e7327a1 | 2085 | if (data_len > c->local_window) { |
bbe88b6d | 2086 | logit("channel %d: rcvd too much extended_data %d, win %d", |
7e7327a1 | 2087 | c->self, data_len, c->local_window); |
2088 | xfree(data); | |
2089 | return; | |
2090 | } | |
de273eef | 2091 | debug2("channel %d: rcvd ext data %d", c->self, data_len); |
7e7327a1 | 2092 | c->local_window -= data_len; |
2093 | buffer_append(&c->extended, data, data_len); | |
2094 | xfree(data); | |
2095 | } | |
2096 | ||
04aa9e67 | 2097 | /* ARGSUSED */ |
6ae2364d | 2098 | void |
7819b5c3 | 2099 | channel_input_ieof(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 2100 | { |
2101 | int id; | |
2102 | Channel *c; | |
2103 | ||
7368a6c8 | 2104 | id = packet_get_int(); |
95500969 | 2105 | packet_check_eom(); |
7368a6c8 | 2106 | c = channel_lookup(id); |
2107 | if (c == NULL) | |
2108 | packet_disconnect("Received ieof for nonexistent channel %d.", id); | |
2109 | chan_rcvd_ieof(c); | |
a5f82435 | 2110 | |
2111 | /* XXX force input close */ | |
8341f420 | 2112 | if (c->force_drain && c->istate == CHAN_INPUT_OPEN) { |
a5f82435 | 2113 | debug("channel %d: FORCE input drain", c->self); |
2114 | c->istate = CHAN_INPUT_WAIT_DRAIN; | |
32e7d71f | 2115 | if (buffer_len(&c->input) == 0) |
2116 | chan_ibuf_empty(c); | |
a5f82435 | 2117 | } |
2118 | ||
7368a6c8 | 2119 | } |
8efc0c15 | 2120 | |
04aa9e67 | 2121 | /* ARGSUSED */ |
6ae2364d | 2122 | void |
7819b5c3 | 2123 | channel_input_close(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2124 | { |
7368a6c8 | 2125 | int id; |
2126 | Channel *c; | |
5260325f | 2127 | |
7368a6c8 | 2128 | id = packet_get_int(); |
95500969 | 2129 | packet_check_eom(); |
7368a6c8 | 2130 | c = channel_lookup(id); |
2131 | if (c == NULL) | |
2132 | packet_disconnect("Received close for nonexistent channel %d.", id); | |
aa3378df | 2133 | |
2134 | /* | |
2135 | * Send a confirmation that we have closed the channel and no more | |
2136 | * data is coming for it. | |
2137 | */ | |
5260325f | 2138 | packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION); |
7368a6c8 | 2139 | packet_put_int(c->remote_id); |
5260325f | 2140 | packet_send(); |
2141 | ||
aa3378df | 2142 | /* |
2143 | * If the channel is in closed state, we have sent a close request, | |
2144 | * and the other side will eventually respond with a confirmation. | |
2145 | * Thus, we cannot free the channel here, because then there would be | |
2146 | * no-one to receive the confirmation. The channel gets freed when | |
2147 | * the confirmation arrives. | |
2148 | */ | |
7368a6c8 | 2149 | if (c->type != SSH_CHANNEL_CLOSED) { |
aa3378df | 2150 | /* |
2151 | * Not a closed channel - mark it as draining, which will | |
2152 | * cause it to be freed later. | |
2153 | */ | |
9c50edcf | 2154 | buffer_clear(&c->input); |
7368a6c8 | 2155 | c->type = SSH_CHANNEL_OUTPUT_DRAINING; |
5260325f | 2156 | } |
8efc0c15 | 2157 | } |
2158 | ||
7368a6c8 | 2159 | /* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */ |
04aa9e67 | 2160 | /* ARGSUSED */ |
6ae2364d | 2161 | void |
7819b5c3 | 2162 | channel_input_oclose(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2163 | { |
7368a6c8 | 2164 | int id = packet_get_int(); |
2165 | Channel *c = channel_lookup(id); | |
a8a21a53 | 2166 | |
95500969 | 2167 | packet_check_eom(); |
7368a6c8 | 2168 | if (c == NULL) |
2169 | packet_disconnect("Received oclose for nonexistent channel %d.", id); | |
2170 | chan_rcvd_oclose(c); | |
8efc0c15 | 2171 | } |
2172 | ||
04aa9e67 | 2173 | /* ARGSUSED */ |
6ae2364d | 2174 | void |
7819b5c3 | 2175 | channel_input_close_confirmation(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 2176 | { |
2177 | int id = packet_get_int(); | |
2178 | Channel *c = channel_lookup(id); | |
2179 | ||
95500969 | 2180 | packet_check_eom(); |
7368a6c8 | 2181 | if (c == NULL) |
2182 | packet_disconnect("Received close confirmation for " | |
2183 | "out-of-range channel %d.", id); | |
2184 | if (c->type != SSH_CHANNEL_CLOSED) | |
2185 | packet_disconnect("Received close confirmation for " | |
2186 | "non-closed channel %d (type %d).", id, c->type); | |
719fc62f | 2187 | channel_free(c); |
7368a6c8 | 2188 | } |
8efc0c15 | 2189 | |
04aa9e67 | 2190 | /* ARGSUSED */ |
6ae2364d | 2191 | void |
7819b5c3 | 2192 | channel_input_open_confirmation(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2193 | { |
7368a6c8 | 2194 | int id, remote_id; |
2195 | Channel *c; | |
5260325f | 2196 | |
7368a6c8 | 2197 | id = packet_get_int(); |
2198 | c = channel_lookup(id); | |
5260325f | 2199 | |
7368a6c8 | 2200 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) |
2201 | packet_disconnect("Received open confirmation for " | |
2202 | "non-opening channel %d.", id); | |
2203 | remote_id = packet_get_int(); | |
aa3378df | 2204 | /* Record the remote channel number and mark that the channel is now open. */ |
7368a6c8 | 2205 | c->remote_id = remote_id; |
2206 | c->type = SSH_CHANNEL_OPEN; | |
7e7327a1 | 2207 | |
2208 | if (compat20) { | |
2209 | c->remote_window = packet_get_int(); | |
2210 | c->remote_maxpacket = packet_get_int(); | |
05ca0898 | 2211 | if (c->confirm) { |
de273eef | 2212 | debug2("callback start"); |
5e96b616 | 2213 | c->confirm(c->self, c->confirm_ctx); |
de273eef | 2214 | debug2("callback done"); |
7e7327a1 | 2215 | } |
d7ac5f18 | 2216 | debug2("channel %d: open confirm rwindow %u rmax %u", c->self, |
7e7327a1 | 2217 | c->remote_window, c->remote_maxpacket); |
2218 | } | |
95500969 | 2219 | packet_check_eom(); |
8efc0c15 | 2220 | } |
2221 | ||
396c147e | 2222 | static char * |
d18e0850 | 2223 | reason2txt(int reason) |
2224 | { | |
6aacefa7 | 2225 | switch (reason) { |
d18e0850 | 2226 | case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED: |
2227 | return "administratively prohibited"; | |
2228 | case SSH2_OPEN_CONNECT_FAILED: | |
2229 | return "connect failed"; | |
2230 | case SSH2_OPEN_UNKNOWN_CHANNEL_TYPE: | |
2231 | return "unknown channel type"; | |
2232 | case SSH2_OPEN_RESOURCE_SHORTAGE: | |
2233 | return "resource shortage"; | |
2234 | } | |
7e8c18e9 | 2235 | return "unknown reason"; |
d18e0850 | 2236 | } |
2237 | ||
04aa9e67 | 2238 | /* ARGSUSED */ |
6ae2364d | 2239 | void |
7819b5c3 | 2240 | channel_input_open_failure(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2241 | { |
02a024dd | 2242 | int id, reason; |
2243 | char *msg = NULL, *lang = NULL; | |
7368a6c8 | 2244 | Channel *c; |
5260325f | 2245 | |
7368a6c8 | 2246 | id = packet_get_int(); |
2247 | c = channel_lookup(id); | |
2248 | ||
2249 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) | |
2250 | packet_disconnect("Received open failure for " | |
2251 | "non-opening channel %d.", id); | |
7e7327a1 | 2252 | if (compat20) { |
02a024dd | 2253 | reason = packet_get_int(); |
fbe90f7b | 2254 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { |
02a024dd | 2255 | msg = packet_get_string(NULL); |
2256 | lang = packet_get_string(NULL); | |
2257 | } | |
bbe88b6d | 2258 | logit("channel %d: open failed: %s%s%s", id, |
d18e0850 | 2259 | reason2txt(reason), msg ? ": ": "", msg ? msg : ""); |
02a024dd | 2260 | if (msg != NULL) |
2261 | xfree(msg); | |
2262 | if (lang != NULL) | |
2263 | xfree(lang); | |
7e7327a1 | 2264 | } |
95500969 | 2265 | packet_check_eom(); |
5260325f | 2266 | /* Free the channel. This will also close the socket. */ |
719fc62f | 2267 | channel_free(c); |
8efc0c15 | 2268 | } |
2269 | ||
04aa9e67 | 2270 | /* ARGSUSED */ |
8e7895b8 | 2271 | void |
7819b5c3 | 2272 | channel_input_window_adjust(int type, u_int32_t seq, void *ctxt) |
8e7895b8 | 2273 | { |
2274 | Channel *c; | |
f91d9a89 | 2275 | int id; |
2276 | u_int adjust; | |
3ffc6336 | 2277 | |
8e7895b8 | 2278 | if (!compat20) |
2279 | return; | |
8efc0c15 | 2280 | |
8e7895b8 | 2281 | /* Get the channel number and verify it. */ |
2282 | id = packet_get_int(); | |
2283 | c = channel_lookup(id); | |
2284 | ||
b872f7f0 | 2285 | if (c == NULL) { |
2286 | logit("Received window adjust for non-open channel %d.", id); | |
8e7895b8 | 2287 | return; |
2288 | } | |
2289 | adjust = packet_get_int(); | |
95500969 | 2290 | packet_check_eom(); |
f91d9a89 | 2291 | debug2("channel %d: rcvd adjust %u", id, adjust); |
8e7895b8 | 2292 | c->remote_window += adjust; |
2293 | } | |
2294 | ||
04aa9e67 | 2295 | /* ARGSUSED */ |
8e7895b8 | 2296 | void |
7819b5c3 | 2297 | channel_input_port_open(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2298 | { |
8e7895b8 | 2299 | Channel *c = NULL; |
2300 | u_short host_port; | |
2301 | char *host, *originator_string; | |
2302 | int remote_id, sock = -1; | |
5260325f | 2303 | |
8e7895b8 | 2304 | remote_id = packet_get_int(); |
2305 | host = packet_get_string(NULL); | |
2306 | host_port = packet_get_int(); | |
2307 | ||
2308 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) { | |
2309 | originator_string = packet_get_string(NULL); | |
2310 | } else { | |
2311 | originator_string = xstrdup("unknown (remote did not supply name)"); | |
2312 | } | |
95500969 | 2313 | packet_check_eom(); |
8e7895b8 | 2314 | sock = channel_connect_to(host, host_port); |
2315 | if (sock != -1) { | |
2316 | c = channel_new("connected socket", | |
2317 | SSH_CHANNEL_CONNECTING, sock, sock, -1, 0, 0, 0, | |
2318 | originator_string, 1); | |
3a0d3d54 | 2319 | c->remote_id = remote_id; |
5260325f | 2320 | } |
0d942eff | 2321 | xfree(originator_string); |
8e7895b8 | 2322 | if (c == NULL) { |
2323 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
2324 | packet_put_int(remote_id); | |
2325 | packet_send(); | |
2326 | } | |
2327 | xfree(host); | |
8efc0c15 | 2328 | } |
2329 | ||
8e7895b8 | 2330 | |
2331 | /* -- tcp forwarding */ | |
2332 | ||
5e4a7219 | 2333 | void |
2334 | channel_set_af(int af) | |
2335 | { | |
2336 | IPv4or6 = af; | |
2337 | } | |
2338 | ||
5641aefa | 2339 | static int |
2340 | channel_setup_fwd_listener(int type, const char *listen_addr, u_short listen_port, | |
2341 | const char *host_to_connect, u_short port_to_connect, int gateway_ports) | |
8efc0c15 | 2342 | { |
719fc62f | 2343 | Channel *c; |
442aee3a | 2344 | int sock, r, success = 0, wildcard = 0, is_client; |
48e671d5 | 2345 | struct addrinfo hints, *ai, *aitop; |
3867aa0a | 2346 | const char *host, *addr; |
5641aefa | 2347 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
5260325f | 2348 | |
5641aefa | 2349 | host = (type == SSH_CHANNEL_RPORT_LISTENER) ? |
2350 | listen_addr : host_to_connect; | |
3867aa0a | 2351 | is_client = (type == SSH_CHANNEL_PORT_LISTENER); |
02a024dd | 2352 | |
5641aefa | 2353 | if (host == NULL) { |
2354 | error("No forward host name."); | |
38946c65 | 2355 | return 0; |
fa08c86b | 2356 | } |
719fc62f | 2357 | if (strlen(host) > SSH_CHANNEL_PATH_LEN - 1) { |
02a024dd | 2358 | error("Forward host name too long."); |
38946c65 | 2359 | return 0; |
02a024dd | 2360 | } |
5260325f | 2361 | |
3867aa0a | 2362 | /* |
2363 | * Determine whether or not a port forward listens to loopback, | |
f8cc7664 | 2364 | * specified address or wildcard. On the client, a specified bind |
2365 | * address will always override gateway_ports. On the server, a | |
2366 | * gateway_ports of 1 (``yes'') will override the client's | |
2367 | * specification and force a wildcard bind, whereas a value of 2 | |
2368 | * (``clientspecified'') will bind to whatever address the client | |
3867aa0a | 2369 | * asked for. |
2370 | * | |
2371 | * Special-case listen_addrs are: | |
2372 | * | |
2373 | * "0.0.0.0" -> wildcard v4/v6 if SSH_OLD_FORWARD_ADDR | |
2374 | * "" (empty string), "*" -> wildcard v4/v6 | |
2375 | * "localhost" -> loopback v4/v6 | |
2376 | */ | |
2377 | addr = NULL; | |
2378 | if (listen_addr == NULL) { | |
2379 | /* No address specified: default to gateway_ports setting */ | |
2380 | if (gateway_ports) | |
2381 | wildcard = 1; | |
2382 | } else if (gateway_ports || is_client) { | |
2383 | if (((datafellows & SSH_OLD_FORWARD_ADDR) && | |
2384 | strcmp(listen_addr, "0.0.0.0") == 0) || | |
2385 | *listen_addr == '\0' || strcmp(listen_addr, "*") == 0 || | |
2386 | (!is_client && gateway_ports == 1)) | |
2387 | wildcard = 1; | |
2388 | else if (strcmp(listen_addr, "localhost") != 0) | |
2389 | addr = listen_addr; | |
2390 | } | |
2391 | ||
2392 | debug3("channel_setup_fwd_listener: type %d wildcard %d addr %s", | |
2393 | type, wildcard, (addr == NULL) ? "NULL" : addr); | |
2394 | ||
aa3378df | 2395 | /* |
48e671d5 | 2396 | * getaddrinfo returns a loopback address if the hostname is |
2397 | * set to NULL and hints.ai_flags is not AI_PASSIVE | |
aa3378df | 2398 | */ |
48e671d5 | 2399 | memset(&hints, 0, sizeof(hints)); |
2400 | hints.ai_family = IPv4or6; | |
3867aa0a | 2401 | hints.ai_flags = wildcard ? AI_PASSIVE : 0; |
48e671d5 | 2402 | hints.ai_socktype = SOCK_STREAM; |
fa08c86b | 2403 | snprintf(strport, sizeof strport, "%d", listen_port); |
3867aa0a | 2404 | if ((r = getaddrinfo(addr, strport, &hints, &aitop)) != 0) { |
2405 | if (addr == NULL) { | |
2406 | /* This really shouldn't happen */ | |
2407 | packet_disconnect("getaddrinfo: fatal error: %s", | |
2408 | gai_strerror(r)); | |
2409 | } else { | |
38946c65 | 2410 | error("channel_setup_fwd_listener: " |
3867aa0a | 2411 | "getaddrinfo(%.64s): %s", addr, gai_strerror(r)); |
2412 | } | |
38946c65 | 2413 | return 0; |
3867aa0a | 2414 | } |
48e671d5 | 2415 | |
48e671d5 | 2416 | for (ai = aitop; ai; ai = ai->ai_next) { |
2417 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
2418 | continue; | |
2419 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), | |
2420 | strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { | |
5641aefa | 2421 | error("channel_setup_fwd_listener: getnameinfo failed"); |
48e671d5 | 2422 | continue; |
2423 | } | |
2424 | /* Create a port to listen for the host. */ | |
3e131a6d | 2425 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
48e671d5 | 2426 | if (sock < 0) { |
2427 | /* this is no error since kernel may not support ipv6 */ | |
2428 | verbose("socket: %.100s", strerror(errno)); | |
2429 | continue; | |
2430 | } | |
442aee3a | 2431 | |
2432 | channel_set_reuseaddr(sock); | |
facfd613 | 2433 | |
48e671d5 | 2434 | debug("Local forwarding listening on %s port %s.", ntop, strport); |
2435 | ||
2436 | /* Bind the socket to the address. */ | |
2437 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { | |
2438 | /* address can be in use ipv6 address is already bound */ | |
16218745 | 2439 | if (!ai->ai_next) |
2440 | error("bind: %.100s", strerror(errno)); | |
2441 | else | |
2442 | verbose("bind: %.100s", strerror(errno)); | |
2b87da3b | 2443 | |
48e671d5 | 2444 | close(sock); |
2445 | continue; | |
2446 | } | |
2447 | /* Start listening for connections on the socket. */ | |
fce39749 | 2448 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { |
48e671d5 | 2449 | error("listen: %.100s", strerror(errno)); |
2450 | close(sock); | |
2451 | continue; | |
2452 | } | |
2453 | /* Allocate a channel number for the socket. */ | |
8e7895b8 | 2454 | c = channel_new("port listener", type, sock, sock, -1, |
0b242b12 | 2455 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, |
0d942eff | 2456 | 0, "port listener", 1); |
719fc62f | 2457 | strlcpy(c->path, host, sizeof(c->path)); |
2458 | c->host_port = port_to_connect; | |
2459 | c->listening_port = listen_port; | |
48e671d5 | 2460 | success = 1; |
2461 | } | |
2462 | if (success == 0) | |
5641aefa | 2463 | error("channel_setup_fwd_listener: cannot listen to port: %d", |
02a024dd | 2464 | listen_port); |
48e671d5 | 2465 | freeaddrinfo(aitop); |
02a024dd | 2466 | return success; |
5260325f | 2467 | } |
8efc0c15 | 2468 | |
d740ec16 | 2469 | int |
2470 | channel_cancel_rport_listener(const char *host, u_short port) | |
2471 | { | |
9a995072 | 2472 | u_int i; |
2473 | int found = 0; | |
d740ec16 | 2474 | |
f8cc7664 | 2475 | for (i = 0; i < channels_alloc; i++) { |
d740ec16 | 2476 | Channel *c = channels[i]; |
2477 | ||
2478 | if (c != NULL && c->type == SSH_CHANNEL_RPORT_LISTENER && | |
2479 | strncmp(c->path, host, sizeof(c->path)) == 0 && | |
f2107e97 | 2480 | c->listening_port == port) { |
2912cbd6 | 2481 | debug2("%s: close channel %d", __func__, i); |
d740ec16 | 2482 | channel_free(c); |
2483 | found = 1; | |
2484 | } | |
2485 | } | |
2486 | ||
2487 | return (found); | |
2488 | } | |
2489 | ||
5641aefa | 2490 | /* protocol local port fwd, used by ssh (and sshd in v1) */ |
2491 | int | |
3867aa0a | 2492 | channel_setup_local_fwd_listener(const char *listen_host, u_short listen_port, |
5641aefa | 2493 | const char *host_to_connect, u_short port_to_connect, int gateway_ports) |
2494 | { | |
2495 | return channel_setup_fwd_listener(SSH_CHANNEL_PORT_LISTENER, | |
3867aa0a | 2496 | listen_host, listen_port, host_to_connect, port_to_connect, |
2497 | gateway_ports); | |
5641aefa | 2498 | } |
2499 | ||
2500 | /* protocol v2 remote port fwd, used by sshd */ | |
2501 | int | |
2502 | channel_setup_remote_fwd_listener(const char *listen_address, | |
2503 | u_short listen_port, int gateway_ports) | |
2504 | { | |
2505 | return channel_setup_fwd_listener(SSH_CHANNEL_RPORT_LISTENER, | |
2506 | listen_address, listen_port, NULL, 0, gateway_ports); | |
2507 | } | |
2508 | ||
aa3378df | 2509 | /* |
2510 | * Initiate forwarding of connections to port "port" on remote host through | |
2511 | * the secure channel to host:port from local side. | |
2512 | */ | |
8efc0c15 | 2513 | |
42ea6f5e | 2514 | int |
3867aa0a | 2515 | channel_request_remote_forwarding(const char *listen_host, u_short listen_port, |
fa08c86b | 2516 | const char *host_to_connect, u_short port_to_connect) |
8efc0c15 | 2517 | { |
54a5250f | 2518 | int type, success = 0; |
fa08c86b | 2519 | |
5260325f | 2520 | /* Record locally that connection to this host/port is permitted. */ |
2521 | if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
2522 | fatal("channel_request_remote_forwarding: too many forwards"); | |
2523 | ||
5260325f | 2524 | /* Send the forward request to the remote side. */ |
7e7327a1 | 2525 | if (compat20) { |
3867aa0a | 2526 | const char *address_to_bind; |
2527 | if (listen_host == NULL) | |
2528 | address_to_bind = "localhost"; | |
2529 | else if (*listen_host == '\0' || strcmp(listen_host, "*") == 0) | |
2530 | address_to_bind = ""; | |
2531 | else | |
2532 | address_to_bind = listen_host; | |
2533 | ||
7e7327a1 | 2534 | packet_start(SSH2_MSG_GLOBAL_REQUEST); |
2535 | packet_put_cstring("tcpip-forward"); | |
e0ae8728 | 2536 | packet_put_char(1); /* boolean: want reply */ |
7e7327a1 | 2537 | packet_put_cstring(address_to_bind); |
2538 | packet_put_int(listen_port); | |
fa08c86b | 2539 | packet_send(); |
2540 | packet_write_wait(); | |
2541 | /* Assume that server accepts the request */ | |
2542 | success = 1; | |
7e7327a1 | 2543 | } else { |
2544 | packet_start(SSH_CMSG_PORT_FORWARD_REQUEST); | |
7e7327a1 | 2545 | packet_put_int(listen_port); |
d6f24e45 | 2546 | packet_put_cstring(host_to_connect); |
2547 | packet_put_int(port_to_connect); | |
7e7327a1 | 2548 | packet_send(); |
2549 | packet_write_wait(); | |
fa08c86b | 2550 | |
2551 | /* Wait for response from the remote side. */ | |
54a5250f | 2552 | type = packet_read(); |
fa08c86b | 2553 | switch (type) { |
2554 | case SSH_SMSG_SUCCESS: | |
2555 | success = 1; | |
2556 | break; | |
2557 | case SSH_SMSG_FAILURE: | |
fa08c86b | 2558 | break; |
2559 | default: | |
2560 | /* Unknown packet */ | |
2561 | packet_disconnect("Protocol error for port forward request:" | |
2562 | "received packet type %d.", type); | |
2563 | } | |
2564 | } | |
2565 | if (success) { | |
2566 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host_to_connect); | |
2567 | permitted_opens[num_permitted_opens].port_to_connect = port_to_connect; | |
2568 | permitted_opens[num_permitted_opens].listen_port = listen_port; | |
2569 | num_permitted_opens++; | |
7e7327a1 | 2570 | } |
42ea6f5e | 2571 | return (success ? 0 : -1); |
8efc0c15 | 2572 | } |
2573 | ||
d740ec16 | 2574 | /* |
f2107e97 | 2575 | * Request cancellation of remote forwarding of connection host:port from |
d740ec16 | 2576 | * local side. |
2577 | */ | |
d740ec16 | 2578 | void |
3867aa0a | 2579 | channel_request_rforward_cancel(const char *host, u_short port) |
d740ec16 | 2580 | { |
2581 | int i; | |
d740ec16 | 2582 | |
2583 | if (!compat20) | |
2584 | return; | |
2585 | ||
2586 | for (i = 0; i < num_permitted_opens; i++) { | |
f2107e97 | 2587 | if (permitted_opens[i].host_to_connect != NULL && |
d740ec16 | 2588 | permitted_opens[i].listen_port == port) |
2589 | break; | |
2590 | } | |
2591 | if (i >= num_permitted_opens) { | |
2592 | debug("%s: requested forward not found", __func__); | |
2593 | return; | |
2594 | } | |
2595 | packet_start(SSH2_MSG_GLOBAL_REQUEST); | |
2596 | packet_put_cstring("cancel-tcpip-forward"); | |
2597 | packet_put_char(0); | |
3867aa0a | 2598 | packet_put_cstring(host == NULL ? "" : host); |
d740ec16 | 2599 | packet_put_int(port); |
2600 | packet_send(); | |
2601 | ||
2602 | permitted_opens[i].listen_port = 0; | |
2603 | permitted_opens[i].port_to_connect = 0; | |
8c4bd764 | 2604 | xfree(permitted_opens[i].host_to_connect); |
d740ec16 | 2605 | permitted_opens[i].host_to_connect = NULL; |
2606 | } | |
2607 | ||
aa3378df | 2608 | /* |
2609 | * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates | |
2610 | * listening for the port, and sends back a success reply (or disconnect | |
42ea6f5e | 2611 | * message if there was an error). |
aa3378df | 2612 | */ |
42ea6f5e | 2613 | int |
1d1ffb87 | 2614 | channel_input_port_forward_request(int is_root, int gateway_ports) |
8efc0c15 | 2615 | { |
57112b5a | 2616 | u_short port, host_port; |
42ea6f5e | 2617 | int success = 0; |
5260325f | 2618 | char *hostname; |
2619 | ||
2620 | /* Get arguments from the packet. */ | |
2621 | port = packet_get_int(); | |
2622 | hostname = packet_get_string(NULL); | |
2623 | host_port = packet_get_int(); | |
2624 | ||
3c62e7eb | 2625 | #ifndef HAVE_CYGWIN |
aa3378df | 2626 | /* |
2627 | * Check that an unprivileged user is not trying to forward a | |
2628 | * privileged port. | |
2629 | */ | |
5260325f | 2630 | if (port < IPPORT_RESERVED && !is_root) |
8e7c9afc | 2631 | packet_disconnect( |
2632 | "Requested forwarding of port %d but user is not root.", | |
2633 | port); | |
2634 | if (host_port == 0) | |
2635 | packet_disconnect("Dynamic forwarding denied."); | |
3c62e7eb | 2636 | #endif |
8e7c9afc | 2637 | |
fa08c86b | 2638 | /* Initiate forwarding */ |
42ea6f5e | 2639 | success = channel_setup_local_fwd_listener(NULL, port, hostname, |
3867aa0a | 2640 | host_port, gateway_ports); |
5260325f | 2641 | |
2642 | /* Free the argument string. */ | |
2643 | xfree(hostname); | |
42ea6f5e | 2644 | |
2645 | return (success ? 0 : -1); | |
8efc0c15 | 2646 | } |
2647 | ||
01794848 | 2648 | /* |
2649 | * Permits opening to any host/port if permitted_opens[] is empty. This is | |
2650 | * usually called by the server, because the user could connect to any port | |
2651 | * anyway, and the server has no way to know but to trust the client anyway. | |
2652 | */ | |
2653 | void | |
d5bb9418 | 2654 | channel_permit_all_opens(void) |
01794848 | 2655 | { |
2656 | if (num_permitted_opens == 0) | |
2657 | all_opens_permitted = 1; | |
2658 | } | |
2659 | ||
cd332296 | 2660 | void |
01794848 | 2661 | channel_add_permitted_opens(char *host, int port) |
2662 | { | |
2663 | if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
42ea6f5e | 2664 | fatal("channel_add_permitted_opens: too many forwards"); |
01794848 | 2665 | debug("allow port forwarding to host %s port %d", host, port); |
2666 | ||
2667 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host); | |
2668 | permitted_opens[num_permitted_opens].port_to_connect = port; | |
2669 | num_permitted_opens++; | |
2670 | ||
2671 | all_opens_permitted = 0; | |
2672 | } | |
2673 | ||
ea46e550 | 2674 | int |
2fefbadf | 2675 | channel_add_adm_permitted_opens(char *host, int port) |
2676 | { | |
2677 | if (num_adm_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
2678 | fatal("channel_add_adm_permitted_opens: too many forwards"); | |
ea46e550 | 2679 | debug("config allows port forwarding to host %s port %d", host, port); |
2fefbadf | 2680 | |
2681 | permitted_adm_opens[num_adm_permitted_opens].host_to_connect | |
2682 | = xstrdup(host); | |
2683 | permitted_adm_opens[num_adm_permitted_opens].port_to_connect = port; | |
ea46e550 | 2684 | return ++num_adm_permitted_opens; |
2fefbadf | 2685 | } |
2686 | ||
cd332296 | 2687 | void |
01794848 | 2688 | channel_clear_permitted_opens(void) |
2689 | { | |
2690 | int i; | |
2691 | ||
2692 | for (i = 0; i < num_permitted_opens; i++) | |
d740ec16 | 2693 | if (permitted_opens[i].host_to_connect != NULL) |
2694 | xfree(permitted_opens[i].host_to_connect); | |
01794848 | 2695 | num_permitted_opens = 0; |
2fefbadf | 2696 | } |
2697 | ||
2698 | void | |
2699 | channel_clear_adm_permitted_opens(void) | |
2700 | { | |
2701 | int i; | |
01794848 | 2702 | |
2fefbadf | 2703 | for (i = 0; i < num_adm_permitted_opens; i++) |
2704 | if (permitted_adm_opens[i].host_to_connect != NULL) | |
2705 | xfree(permitted_adm_opens[i].host_to_connect); | |
2706 | num_adm_permitted_opens = 0; | |
01794848 | 2707 | } |
2708 | ||
01794848 | 2709 | /* return socket to remote host, port */ |
396c147e | 2710 | static int |
01794848 | 2711 | connect_to(const char *host, u_short port) |
8efc0c15 | 2712 | { |
48e671d5 | 2713 | struct addrinfo hints, *ai, *aitop; |
2714 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; | |
2715 | int gaierr; | |
7368a6c8 | 2716 | int sock = -1; |
48e671d5 | 2717 | |
2718 | memset(&hints, 0, sizeof(hints)); | |
2719 | hints.ai_family = IPv4or6; | |
2720 | hints.ai_socktype = SOCK_STREAM; | |
01794848 | 2721 | snprintf(strport, sizeof strport, "%d", port); |
48e671d5 | 2722 | if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) { |
01794848 | 2723 | error("connect_to %.100s: unknown host (%s)", host, |
2724 | gai_strerror(gaierr)); | |
7368a6c8 | 2725 | return -1; |
48e671d5 | 2726 | } |
48e671d5 | 2727 | for (ai = aitop; ai; ai = ai->ai_next) { |
2728 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
2729 | continue; | |
2730 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), | |
2731 | strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { | |
01794848 | 2732 | error("connect_to: getnameinfo failed"); |
48e671d5 | 2733 | continue; |
5260325f | 2734 | } |
3e131a6d | 2735 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
48e671d5 | 2736 | if (sock < 0) { |
4940c411 | 2737 | if (ai->ai_next == NULL) |
2738 | error("socket: %.100s", strerror(errno)); | |
2739 | else | |
2740 | verbose("socket: %.100s", strerror(errno)); | |
48e671d5 | 2741 | continue; |
5260325f | 2742 | } |
170694d7 | 2743 | if (set_nonblock(sock) == -1) |
2744 | fatal("%s: set_nonblock(%d)", __func__, sock); | |
97fb6912 | 2745 | if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0 && |
2746 | errno != EINPROGRESS) { | |
01794848 | 2747 | error("connect_to %.100s port %s: %.100s", ntop, strport, |
48e671d5 | 2748 | strerror(errno)); |
2749 | close(sock); | |
2b87da3b | 2750 | continue; /* fail -- try next */ |
48e671d5 | 2751 | } |
2752 | break; /* success */ | |
5260325f | 2753 | |
5260325f | 2754 | } |
48e671d5 | 2755 | freeaddrinfo(aitop); |
48e671d5 | 2756 | if (!ai) { |
01794848 | 2757 | error("connect_to %.100s port %d: failed.", host, port); |
7368a6c8 | 2758 | return -1; |
8efc0c15 | 2759 | } |
7368a6c8 | 2760 | /* success */ |
811a6342 | 2761 | set_nodelay(sock); |
7368a6c8 | 2762 | return sock; |
2763 | } | |
01794848 | 2764 | |
fa08c86b | 2765 | int |
b3f8a79c | 2766 | channel_connect_by_listen_address(u_short listen_port) |
fa08c86b | 2767 | { |
2768 | int i; | |
01794848 | 2769 | |
fa08c86b | 2770 | for (i = 0; i < num_permitted_opens; i++) |
d740ec16 | 2771 | if (permitted_opens[i].host_to_connect != NULL && |
2772 | permitted_opens[i].listen_port == listen_port) | |
01794848 | 2773 | return connect_to( |
fa08c86b | 2774 | permitted_opens[i].host_to_connect, |
2775 | permitted_opens[i].port_to_connect); | |
0b6fbf03 | 2776 | error("WARNING: Server requests forwarding for unknown listen_port %d", |
2777 | listen_port); | |
fa08c86b | 2778 | return -1; |
2779 | } | |
48e671d5 | 2780 | |
01794848 | 2781 | /* Check if connecting to that port is permitted and connect. */ |
2782 | int | |
2783 | channel_connect_to(const char *host, u_short port) | |
2784 | { | |
2fefbadf | 2785 | int i, permit, permit_adm = 1; |
01794848 | 2786 | |
2787 | permit = all_opens_permitted; | |
2788 | if (!permit) { | |
2789 | for (i = 0; i < num_permitted_opens; i++) | |
d740ec16 | 2790 | if (permitted_opens[i].host_to_connect != NULL && |
2791 | permitted_opens[i].port_to_connect == port && | |
01794848 | 2792 | strcmp(permitted_opens[i].host_to_connect, host) == 0) |
2793 | permit = 1; | |
2fefbadf | 2794 | } |
01794848 | 2795 | |
2fefbadf | 2796 | if (num_adm_permitted_opens > 0) { |
2797 | permit_adm = 0; | |
2798 | for (i = 0; i < num_adm_permitted_opens; i++) | |
2799 | if (permitted_adm_opens[i].host_to_connect != NULL && | |
2800 | permitted_adm_opens[i].port_to_connect == port && | |
2801 | strcmp(permitted_adm_opens[i].host_to_connect, host) | |
2802 | == 0) | |
2803 | permit_adm = 1; | |
01794848 | 2804 | } |
2fefbadf | 2805 | |
2806 | if (!permit || !permit_adm) { | |
bbe88b6d | 2807 | logit("Received request to connect to host %.100s port %d, " |
01794848 | 2808 | "but the request was denied.", host, port); |
2809 | return -1; | |
2810 | } | |
2811 | return connect_to(host, port); | |
2812 | } | |
2813 | ||
5e96b616 | 2814 | void |
2815 | channel_send_window_changes(void) | |
2816 | { | |
9a995072 | 2817 | u_int i; |
5e96b616 | 2818 | struct winsize ws; |
2819 | ||
2820 | for (i = 0; i < channels_alloc; i++) { | |
f8cc7664 | 2821 | if (channels[i] == NULL || !channels[i]->client_tty || |
5e96b616 | 2822 | channels[i]->type != SSH_CHANNEL_OPEN) |
2823 | continue; | |
2824 | if (ioctl(channels[i]->rfd, TIOCGWINSZ, &ws) < 0) | |
2825 | continue; | |
2826 | channel_request_start(i, "window-change", 0); | |
148de80c | 2827 | packet_put_int((u_int)ws.ws_col); |
2828 | packet_put_int((u_int)ws.ws_row); | |
2829 | packet_put_int((u_int)ws.ws_xpixel); | |
2830 | packet_put_int((u_int)ws.ws_ypixel); | |
5e96b616 | 2831 | packet_send(); |
2832 | } | |
2833 | } | |
2834 | ||
8e7895b8 | 2835 | /* -- X11 forwarding */ |
8efc0c15 | 2836 | |
aa3378df | 2837 | /* |
2838 | * Creates an internet domain socket for listening for X11 connections. | |
57f228e8 | 2839 | * Returns 0 and a suitable display number for the DISPLAY variable |
2840 | * stored in display_numberp , or -1 if an error occurs. | |
aa3378df | 2841 | */ |
c9d0ad9b | 2842 | int |
e6e573bd | 2843 | x11_create_display_inet(int x11_display_offset, int x11_use_localhost, |
d08341e6 | 2844 | int single_connection, u_int *display_numberp, int **chanids) |
8efc0c15 | 2845 | { |
ac151b18 | 2846 | Channel *nc = NULL; |
57112b5a | 2847 | int display_number, sock; |
2848 | u_short port; | |
48e671d5 | 2849 | struct addrinfo hints, *ai, *aitop; |
2850 | char strport[NI_MAXSERV]; | |
2851 | int gaierr, n, num_socks = 0, socks[NUM_SOCKS]; | |
5260325f | 2852 | |
59e5aff5 | 2853 | if (chanids == NULL) |
2854 | return -1; | |
2855 | ||
95f1eccc | 2856 | for (display_number = x11_display_offset; |
184eed6a | 2857 | display_number < MAX_DISPLAYS; |
2858 | display_number++) { | |
5260325f | 2859 | port = 6000 + display_number; |
48e671d5 | 2860 | memset(&hints, 0, sizeof(hints)); |
2861 | hints.ai_family = IPv4or6; | |
e6e573bd | 2862 | hints.ai_flags = x11_use_localhost ? 0: AI_PASSIVE; |
48e671d5 | 2863 | hints.ai_socktype = SOCK_STREAM; |
2864 | snprintf(strport, sizeof strport, "%d", port); | |
2865 | if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) { | |
2866 | error("getaddrinfo: %.100s", gai_strerror(gaierr)); | |
c9d0ad9b | 2867 | return -1; |
5260325f | 2868 | } |
48e671d5 | 2869 | for (ai = aitop; ai; ai = ai->ai_next) { |
2870 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
2871 | continue; | |
3e131a6d | 2872 | sock = socket(ai->ai_family, ai->ai_socktype, |
2873 | ai->ai_protocol); | |
48e671d5 | 2874 | if (sock < 0) { |
4ee81249 | 2875 | if ((errno != EINVAL) && (errno != EAFNOSUPPORT)) { |
80a44451 | 2876 | error("socket: %.100s", strerror(errno)); |
0ea89f7e | 2877 | freeaddrinfo(aitop); |
c9d0ad9b | 2878 | return -1; |
80a44451 | 2879 | } else { |
22d89d24 | 2880 | debug("x11_create_display_inet: Socket family %d not supported", |
2881 | ai->ai_family); | |
80a44451 | 2882 | continue; |
2883 | } | |
48e671d5 | 2884 | } |
688aaeda | 2885 | #ifdef IPV6_V6ONLY |
2886 | if (ai->ai_family == AF_INET6) { | |
2887 | int on = 1; | |
2888 | if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) < 0) | |
2889 | error("setsockopt IPV6_V6ONLY: %.100s", strerror(errno)); | |
2890 | } | |
2891 | #endif | |
442aee3a | 2892 | channel_set_reuseaddr(sock); |
48e671d5 | 2893 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { |
d7ac5f18 | 2894 | debug2("bind port %d: %.100s", port, strerror(errno)); |
48e671d5 | 2895 | close(sock); |
16218745 | 2896 | |
2897 | if (ai->ai_next) | |
2898 | continue; | |
2899 | ||
48e671d5 | 2900 | for (n = 0; n < num_socks; n++) { |
48e671d5 | 2901 | close(socks[n]); |
2902 | } | |
2903 | num_socks = 0; | |
2904 | break; | |
2905 | } | |
2906 | socks[num_socks++] = sock; | |
80faa19f | 2907 | #ifndef DONT_TRY_OTHER_AF |
48e671d5 | 2908 | if (num_socks == NUM_SOCKS) |
2909 | break; | |
80faa19f | 2910 | #else |
688aaeda | 2911 | if (x11_use_localhost) { |
2912 | if (num_socks == NUM_SOCKS) | |
2913 | break; | |
2914 | } else { | |
2915 | break; | |
2916 | } | |
80faa19f | 2917 | #endif |
5260325f | 2918 | } |
4ccb01d6 | 2919 | freeaddrinfo(aitop); |
48e671d5 | 2920 | if (num_socks > 0) |
2921 | break; | |
5260325f | 2922 | } |
2923 | if (display_number >= MAX_DISPLAYS) { | |
2924 | error("Failed to allocate internet-domain X11 display socket."); | |
c9d0ad9b | 2925 | return -1; |
8efc0c15 | 2926 | } |
5260325f | 2927 | /* Start listening for connections on the socket. */ |
48e671d5 | 2928 | for (n = 0; n < num_socks; n++) { |
2929 | sock = socks[n]; | |
fce39749 | 2930 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { |
48e671d5 | 2931 | error("listen: %.100s", strerror(errno)); |
48e671d5 | 2932 | close(sock); |
c9d0ad9b | 2933 | return -1; |
a7effaac | 2934 | } |
a7effaac | 2935 | } |
5260325f | 2936 | |
48e671d5 | 2937 | /* Allocate a channel for each socket. */ |
52e3daed | 2938 | *chanids = xcalloc(num_socks + 1, sizeof(**chanids)); |
48e671d5 | 2939 | for (n = 0; n < num_socks; n++) { |
2940 | sock = socks[n]; | |
ac151b18 | 2941 | nc = channel_new("x11 listener", |
0b242b12 | 2942 | SSH_CHANNEL_X11_LISTENER, sock, sock, -1, |
2943 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, | |
0d942eff | 2944 | 0, "X11 inet listener", 1); |
3a0d3d54 | 2945 | nc->single_connection = single_connection; |
59e5aff5 | 2946 | (*chanids)[n] = nc->self; |
48e671d5 | 2947 | } |
59e5aff5 | 2948 | (*chanids)[n] = -1; |
5260325f | 2949 | |
c9d0ad9b | 2950 | /* Return the display number for the DISPLAY environment variable. */ |
57f228e8 | 2951 | *display_numberp = display_number; |
2952 | return (0); | |
8efc0c15 | 2953 | } |
2954 | ||
396c147e | 2955 | static int |
1e3b8b07 | 2956 | connect_local_xsocket(u_int dnr) |
8efc0c15 | 2957 | { |
5260325f | 2958 | int sock; |
2959 | struct sockaddr_un addr; | |
5260325f | 2960 | |
805e659f | 2961 | sock = socket(AF_UNIX, SOCK_STREAM, 0); |
2962 | if (sock < 0) | |
2963 | error("socket: %.100s", strerror(errno)); | |
2964 | memset(&addr, 0, sizeof(addr)); | |
2965 | addr.sun_family = AF_UNIX; | |
2966 | snprintf(addr.sun_path, sizeof addr.sun_path, _PATH_UNIX_X, dnr); | |
32596c7b | 2967 | if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) == 0) |
805e659f | 2968 | return sock; |
2969 | close(sock); | |
5260325f | 2970 | error("connect %.100s: %.100s", addr.sun_path, strerror(errno)); |
2971 | return -1; | |
8efc0c15 | 2972 | } |
2973 | ||
0b242b12 | 2974 | int |
2975 | x11_connect_display(void) | |
8efc0c15 | 2976 | { |
4f16046f | 2977 | u_int display_number; |
5260325f | 2978 | const char *display; |
0b242b12 | 2979 | char buf[1024], *cp; |
48e671d5 | 2980 | struct addrinfo hints, *ai, *aitop; |
2981 | char strport[NI_MAXSERV]; | |
4f16046f | 2982 | int gaierr, sock = 0; |
5260325f | 2983 | |
5260325f | 2984 | /* Try to open a socket for the local X server. */ |
2985 | display = getenv("DISPLAY"); | |
2986 | if (!display) { | |
2987 | error("DISPLAY not set."); | |
0b242b12 | 2988 | return -1; |
5260325f | 2989 | } |
aa3378df | 2990 | /* |
2991 | * Now we decode the value of the DISPLAY variable and make a | |
2992 | * connection to the real X server. | |
2993 | */ | |
2994 | ||
2995 | /* | |
2996 | * Check if it is a unix domain socket. Unix domain displays are in | |
2997 | * one of the following formats: unix:d[.s], :d[.s], ::d[.s] | |
2998 | */ | |
5260325f | 2999 | if (strncmp(display, "unix:", 5) == 0 || |
3000 | display[0] == ':') { | |
3001 | /* Connect to the unix domain socket. */ | |
4f16046f | 3002 | if (sscanf(strrchr(display, ':') + 1, "%u", &display_number) != 1) { |
5260325f | 3003 | error("Could not parse display number from DISPLAY: %.100s", |
184eed6a | 3004 | display); |
0b242b12 | 3005 | return -1; |
5260325f | 3006 | } |
3007 | /* Create a socket. */ | |
3008 | sock = connect_local_xsocket(display_number); | |
3009 | if (sock < 0) | |
0b242b12 | 3010 | return -1; |
5260325f | 3011 | |
3012 | /* OK, we now have a connection to the display. */ | |
0b242b12 | 3013 | return sock; |
5260325f | 3014 | } |
aa3378df | 3015 | /* |
3016 | * Connect to an inet socket. The DISPLAY value is supposedly | |
3017 | * hostname:d[.s], where hostname may also be numeric IP address. | |
3018 | */ | |
74860245 | 3019 | strlcpy(buf, display, sizeof(buf)); |
5260325f | 3020 | cp = strchr(buf, ':'); |
3021 | if (!cp) { | |
3022 | error("Could not find ':' in DISPLAY: %.100s", display); | |
0b242b12 | 3023 | return -1; |
5260325f | 3024 | } |
3025 | *cp = 0; | |
aa3378df | 3026 | /* buf now contains the host name. But first we parse the display number. */ |
4f16046f | 3027 | if (sscanf(cp + 1, "%u", &display_number) != 1) { |
5260325f | 3028 | error("Could not parse display number from DISPLAY: %.100s", |
184eed6a | 3029 | display); |
0b242b12 | 3030 | return -1; |
5260325f | 3031 | } |
5260325f | 3032 | |
48e671d5 | 3033 | /* Look up the host address */ |
3034 | memset(&hints, 0, sizeof(hints)); | |
3035 | hints.ai_family = IPv4or6; | |
3036 | hints.ai_socktype = SOCK_STREAM; | |
4f16046f | 3037 | snprintf(strport, sizeof strport, "%u", 6000 + display_number); |
48e671d5 | 3038 | if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) { |
3039 | error("%.100s: unknown host. (%s)", buf, gai_strerror(gaierr)); | |
0b242b12 | 3040 | return -1; |
8efc0c15 | 3041 | } |
48e671d5 | 3042 | for (ai = aitop; ai; ai = ai->ai_next) { |
3043 | /* Create a socket. */ | |
3e131a6d | 3044 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
48e671d5 | 3045 | if (sock < 0) { |
d7ac5f18 | 3046 | debug2("socket: %.100s", strerror(errno)); |
7368a6c8 | 3047 | continue; |
3048 | } | |
3049 | /* Connect it to the display. */ | |
3050 | if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) { | |
4f16046f | 3051 | debug2("connect %.100s port %u: %.100s", buf, |
7368a6c8 | 3052 | 6000 + display_number, strerror(errno)); |
3053 | close(sock); | |
3054 | continue; | |
3055 | } | |
3056 | /* Success */ | |
3057 | break; | |
48e671d5 | 3058 | } |
48e671d5 | 3059 | freeaddrinfo(aitop); |
3060 | if (!ai) { | |
4f16046f | 3061 | error("connect %.100s port %u: %.100s", buf, 6000 + display_number, |
48e671d5 | 3062 | strerror(errno)); |
0b242b12 | 3063 | return -1; |
8efc0c15 | 3064 | } |
bcc0381e | 3065 | set_nodelay(sock); |
0b242b12 | 3066 | return sock; |
3067 | } | |
5260325f | 3068 | |
0b242b12 | 3069 | /* |
3070 | * This is called when SSH_SMSG_X11_OPEN is received. The packet contains | |
3071 | * the remote channel number. We should do whatever we want, and respond | |
3072 | * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE. | |
3073 | */ | |
5260325f | 3074 | |
ebb90778 | 3075 | /* ARGSUSED */ |
0b242b12 | 3076 | void |
7819b5c3 | 3077 | x11_input_open(int type, u_int32_t seq, void *ctxt) |
0b242b12 | 3078 | { |
719fc62f | 3079 | Channel *c = NULL; |
3080 | int remote_id, sock = 0; | |
0b242b12 | 3081 | char *remote_host; |
5260325f | 3082 | |
719fc62f | 3083 | debug("Received X11 open request."); |
5260325f | 3084 | |
719fc62f | 3085 | remote_id = packet_get_int(); |
8e7895b8 | 3086 | |
3087 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) { | |
719fc62f | 3088 | remote_host = packet_get_string(NULL); |
0b242b12 | 3089 | } else { |
3090 | remote_host = xstrdup("unknown (remote did not supply name)"); | |
0b242b12 | 3091 | } |
95500969 | 3092 | packet_check_eom(); |
0b242b12 | 3093 | |
3094 | /* Obtain a connection to the real X display. */ | |
3095 | sock = x11_connect_display(); | |
719fc62f | 3096 | if (sock != -1) { |
3097 | /* Allocate a channel for this connection. */ | |
3098 | c = channel_new("connected x11 socket", | |
3099 | SSH_CHANNEL_X11_OPEN, sock, sock, -1, 0, 0, 0, | |
3100 | remote_host, 1); | |
3a0d3d54 | 3101 | c->remote_id = remote_id; |
3102 | c->force_drain = 1; | |
719fc62f | 3103 | } |
0d942eff | 3104 | xfree(remote_host); |
719fc62f | 3105 | if (c == NULL) { |
0b242b12 | 3106 | /* Send refusal to the remote host. */ |
3107 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
719fc62f | 3108 | packet_put_int(remote_id); |
0b242b12 | 3109 | } else { |
0b242b12 | 3110 | /* Send a confirmation to the remote host. */ |
3111 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
719fc62f | 3112 | packet_put_int(remote_id); |
3113 | packet_put_int(c->self); | |
0b242b12 | 3114 | } |
719fc62f | 3115 | packet_send(); |
8efc0c15 | 3116 | } |
3117 | ||
a22aff1f | 3118 | /* dummy protocol handler that denies SSH-1 requests (agent/x11) */ |
ebb90778 | 3119 | /* ARGSUSED */ |
a22aff1f | 3120 | void |
7819b5c3 | 3121 | deny_input_open(int type, u_int32_t seq, void *ctxt) |
a22aff1f | 3122 | { |
3123 | int rchan = packet_get_int(); | |
e1feb9bf | 3124 | |
6aacefa7 | 3125 | switch (type) { |
a22aff1f | 3126 | case SSH_SMSG_AGENT_OPEN: |
3127 | error("Warning: ssh server tried agent forwarding."); | |
3128 | break; | |
3129 | case SSH_SMSG_X11_OPEN: | |
3130 | error("Warning: ssh server tried X11 forwarding."); | |
3131 | break; | |
3132 | default: | |
7819b5c3 | 3133 | error("deny_input_open: type %d", type); |
a22aff1f | 3134 | break; |
3135 | } | |
1908529f | 3136 | error("Warning: this is probably a break-in attempt by a malicious server."); |
a22aff1f | 3137 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
3138 | packet_put_int(rchan); | |
3139 | packet_send(); | |
3140 | } | |
3141 | ||
aa3378df | 3142 | /* |
3143 | * Requests forwarding of X11 connections, generates fake authentication | |
3144 | * data, and enables authentication spoofing. | |
8e7895b8 | 3145 | * This should be called in the client only. |
aa3378df | 3146 | */ |
6ae2364d | 3147 | void |
9bf083eb | 3148 | x11_request_forwarding_with_spoofing(int client_session_id, const char *disp, |
0b242b12 | 3149 | const char *proto, const char *data) |
8efc0c15 | 3150 | { |
1e3b8b07 | 3151 | u_int data_len = (u_int) strlen(data) / 2; |
ef07103c | 3152 | u_int i, value; |
5260325f | 3153 | char *new_data; |
3154 | int screen_number; | |
3155 | const char *cp; | |
ca75d7de | 3156 | u_int32_t rnd = 0; |
5260325f | 3157 | |
4297b666 | 3158 | if (x11_saved_display == NULL) |
3159 | x11_saved_display = xstrdup(disp); | |
3160 | else if (strcmp(disp, x11_saved_display) != 0) { | |
ef07103c | 3161 | error("x11_request_forwarding_with_spoofing: different " |
3162 | "$DISPLAY already forwarded"); | |
3163 | return; | |
3164 | } | |
3165 | ||
9bf083eb | 3166 | cp = disp; |
3167 | if (disp) | |
3168 | cp = strchr(disp, ':'); | |
5260325f | 3169 | if (cp) |
3170 | cp = strchr(cp, '.'); | |
3171 | if (cp) | |
d6d4897e | 3172 | screen_number = (u_int)strtonum(cp + 1, 0, 400, NULL); |
5260325f | 3173 | else |
3174 | screen_number = 0; | |
3175 | ||
ef07103c | 3176 | if (x11_saved_proto == NULL) { |
3177 | /* Save protocol name. */ | |
3178 | x11_saved_proto = xstrdup(proto); | |
3179 | /* | |
56964485 | 3180 | * Extract real authentication data and generate fake data |
ef07103c | 3181 | * of the same length. |
3182 | */ | |
3183 | x11_saved_data = xmalloc(data_len); | |
3184 | x11_fake_data = xmalloc(data_len); | |
3185 | for (i = 0; i < data_len; i++) { | |
3186 | if (sscanf(data + 2 * i, "%2x", &value) != 1) | |
3187 | fatal("x11_request_forwarding: bad " | |
3188 | "authentication data: %.100s", data); | |
3189 | if (i % 4 == 0) | |
3190 | rnd = arc4random(); | |
3191 | x11_saved_data[i] = value; | |
3192 | x11_fake_data[i] = rnd & 0xff; | |
3193 | rnd >>= 8; | |
3194 | } | |
3195 | x11_saved_data_len = data_len; | |
3196 | x11_fake_data_len = data_len; | |
3197 | } | |
5260325f | 3198 | |
3199 | /* Convert the fake data into hex. */ | |
ef07103c | 3200 | new_data = tohex(x11_fake_data, data_len); |
5260325f | 3201 | |
3202 | /* Send the request packet. */ | |
0b242b12 | 3203 | if (compat20) { |
3204 | channel_request_start(client_session_id, "x11-req", 0); | |
3205 | packet_put_char(0); /* XXX bool single connection */ | |
3206 | } else { | |
3207 | packet_start(SSH_CMSG_X11_REQUEST_FORWARDING); | |
3208 | } | |
3209 | packet_put_cstring(proto); | |
3210 | packet_put_cstring(new_data); | |
5260325f | 3211 | packet_put_int(screen_number); |
3212 | packet_send(); | |
3213 | packet_write_wait(); | |
3214 | xfree(new_data); | |
8efc0c15 | 3215 | } |
3216 | ||
8e7895b8 | 3217 | |
3218 | /* -- agent forwarding */ | |
3219 | ||
8efc0c15 | 3220 | /* Sends a message to the server to request authentication fd forwarding. */ |
3221 | ||
6ae2364d | 3222 | void |
d5bb9418 | 3223 | auth_request_forwarding(void) |
8efc0c15 | 3224 | { |
5260325f | 3225 | packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING); |
3226 | packet_send(); | |
3227 | packet_write_wait(); | |
8efc0c15 | 3228 | } |