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bb4626fe | 1 | /* $OpenBSD: channels.c,v 1.271 2007/12/27 14:22:08 dtucker Exp $ */ |
8efc0c15 | 2 | /* |
5260325f | 3 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
5260325f | 4 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
5 | * All rights reserved | |
5260325f | 6 | * This file contains functions for generic socket connection forwarding. |
7 | * There is also code for initiating connection forwarding for X11 connections, | |
8 | * arbitrary tcp/ip connections, and the authentication agent connection. | |
6ae2364d | 9 | * |
bcbf86ec | 10 | * As far as I am concerned, the code I have written for this software |
11 | * can be used freely for any purpose. Any derived versions of this | |
12 | * software must be clearly marked as such, and if the derived work is | |
13 | * incompatible with the protocol description in the RFC file, it must be | |
14 | * called by a name other than "ssh" or "Secure Shell". | |
15 | * | |
7e7327a1 | 16 | * SSH2 support added by Markus Friedl. |
8341f420 | 17 | * Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved. |
bcbf86ec | 18 | * Copyright (c) 1999 Dug Song. All rights reserved. |
19 | * Copyright (c) 1999 Theo de Raadt. All rights reserved. | |
20 | * | |
21 | * Redistribution and use in source and binary forms, with or without | |
22 | * modification, are permitted provided that the following conditions | |
23 | * are met: | |
24 | * 1. Redistributions of source code must retain the above copyright | |
25 | * notice, this list of conditions and the following disclaimer. | |
26 | * 2. Redistributions in binary form must reproduce the above copyright | |
27 | * notice, this list of conditions and the following disclaimer in the | |
28 | * documentation and/or other materials provided with the distribution. | |
29 | * | |
30 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
31 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
32 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
33 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
34 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
35 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
36 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
37 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
38 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
39 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
5260325f | 40 | */ |
8efc0c15 | 41 | |
42 | #include "includes.h" | |
bd7c69ea | 43 | |
cebb4c24 | 44 | #include <sys/types.h> |
31652869 | 45 | #include <sys/ioctl.h> |
cebb4c24 | 46 | #include <sys/un.h> |
319d6b41 | 47 | #include <sys/socket.h> |
e264ac72 | 48 | #ifdef HAVE_SYS_TIME_H |
49 | # include <sys/time.h> | |
50 | #endif | |
319d6b41 | 51 | |
52 | #include <netinet/in.h> | |
53 | #include <arpa/inet.h> | |
1d3e026f | 54 | |
028094f4 | 55 | #include <errno.h> |
28cb0a43 | 56 | #include <netdb.h> |
cf851879 | 57 | #include <stdio.h> |
ffa517a8 | 58 | #include <stdlib.h> |
00146caa | 59 | #include <string.h> |
1d3e026f | 60 | #include <termios.h> |
5188ba17 | 61 | #include <unistd.h> |
31652869 | 62 | #include <stdarg.h> |
8efc0c15 | 63 | |
31652869 | 64 | #include "xmalloc.h" |
8efc0c15 | 65 | #include "ssh.h" |
42f11eb2 | 66 | #include "ssh1.h" |
67 | #include "ssh2.h" | |
8efc0c15 | 68 | #include "packet.h" |
42f11eb2 | 69 | #include "log.h" |
70 | #include "misc.h" | |
31652869 | 71 | #include "buffer.h" |
8efc0c15 | 72 | #include "channels.h" |
8efc0c15 | 73 | #include "compat.h" |
42f11eb2 | 74 | #include "canohost.h" |
4c8722d9 | 75 | #include "key.h" |
76 | #include "authfd.h" | |
805e659f | 77 | #include "pathnames.h" |
8efc0c15 | 78 | |
8e7895b8 | 79 | /* -- channel core */ |
8efc0c15 | 80 | |
aa3378df | 81 | /* |
82 | * Pointer to an array containing all allocated channels. The array is | |
83 | * dynamically extended as needed. | |
84 | */ | |
719fc62f | 85 | static Channel **channels = NULL; |
8efc0c15 | 86 | |
aa3378df | 87 | /* |
88 | * Size of the channel array. All slots of the array must always be | |
719fc62f | 89 | * initialized (at least the type field); unused slots set to NULL |
aa3378df | 90 | */ |
9a995072 | 91 | static u_int channels_alloc = 0; |
8efc0c15 | 92 | |
aa3378df | 93 | /* |
94 | * Maximum file descriptor value used in any of the channels. This is | |
719fc62f | 95 | * updated in channel_new. |
aa3378df | 96 | */ |
39929cdb | 97 | static int channel_max_fd = 0; |
8efc0c15 | 98 | |
8efc0c15 | 99 | |
8e7895b8 | 100 | /* -- tcp forwarding */ |
8efc0c15 | 101 | |
aa3378df | 102 | /* |
103 | * Data structure for storing which hosts are permitted for forward requests. | |
104 | * The local sides of any remote forwards are stored in this array to prevent | |
105 | * a corrupt remote server from accessing arbitrary TCP/IP ports on our local | |
106 | * network (which might be behind a firewall). | |
107 | */ | |
5260325f | 108 | typedef struct { |
7368a6c8 | 109 | char *host_to_connect; /* Connect to 'host'. */ |
110 | u_short port_to_connect; /* Connect to 'port'. */ | |
111 | u_short listen_port; /* Remote side should listen port number. */ | |
8efc0c15 | 112 | } ForwardPermission; |
113 | ||
2fefbadf | 114 | /* List of all permitted host/port pairs to connect by the user. */ |
8efc0c15 | 115 | static ForwardPermission permitted_opens[SSH_MAX_FORWARDS_PER_DIRECTION]; |
8e7895b8 | 116 | |
2fefbadf | 117 | /* List of all permitted host/port pairs to connect by the admin. */ |
118 | static ForwardPermission permitted_adm_opens[SSH_MAX_FORWARDS_PER_DIRECTION]; | |
119 | ||
120 | /* Number of permitted host/port pairs in the array permitted by the user. */ | |
8efc0c15 | 121 | static int num_permitted_opens = 0; |
2fefbadf | 122 | |
123 | /* Number of permitted host/port pair in the array permitted by the admin. */ | |
124 | static int num_adm_permitted_opens = 0; | |
125 | ||
aa3378df | 126 | /* |
127 | * If this is true, all opens are permitted. This is the case on the server | |
128 | * on which we have to trust the client anyway, and the user could do | |
129 | * anything after logging in anyway. | |
130 | */ | |
8efc0c15 | 131 | static int all_opens_permitted = 0; |
132 | ||
8efc0c15 | 133 | |
8e7895b8 | 134 | /* -- X11 forwarding */ |
42f11eb2 | 135 | |
8e7895b8 | 136 | /* Maximum number of fake X11 displays to try. */ |
137 | #define MAX_DISPLAYS 1000 | |
0490e609 | 138 | |
ef07103c | 139 | /* Saved X11 local (client) display. */ |
140 | static char *x11_saved_display = NULL; | |
141 | ||
8e7895b8 | 142 | /* Saved X11 authentication protocol name. */ |
143 | static char *x11_saved_proto = NULL; | |
8efc0c15 | 144 | |
8e7895b8 | 145 | /* Saved X11 authentication data. This is the real data. */ |
146 | static char *x11_saved_data = NULL; | |
147 | static u_int x11_saved_data_len = 0; | |
148 | ||
149 | /* | |
150 | * Fake X11 authentication data. This is what the server will be sending us; | |
151 | * we should replace any occurrences of this by the real data. | |
152 | */ | |
338eb2ab | 153 | static u_char *x11_fake_data = NULL; |
8e7895b8 | 154 | static u_int x11_fake_data_len; |
155 | ||
156 | ||
157 | /* -- agent forwarding */ | |
8efc0c15 | 158 | |
8e7895b8 | 159 | #define NUM_SOCKS 10 |
160 | ||
8e7895b8 | 161 | /* AF_UNSPEC or AF_INET or AF_INET6 */ |
5e4a7219 | 162 | static int IPv4or6 = AF_UNSPEC; |
8e7895b8 | 163 | |
164 | /* helper */ | |
396c147e | 165 | static void port_open_helper(Channel *c, char *rtype); |
8e7895b8 | 166 | |
167 | /* -- channel core */ | |
7368a6c8 | 168 | |
169 | Channel * | |
b872f7f0 | 170 | channel_by_id(int id) |
7368a6c8 | 171 | { |
172 | Channel *c; | |
719fc62f | 173 | |
9a995072 | 174 | if (id < 0 || (u_int)id >= channels_alloc) { |
b872f7f0 | 175 | logit("channel_by_id: %d: bad id", id); |
7368a6c8 | 176 | return NULL; |
177 | } | |
719fc62f | 178 | c = channels[id]; |
179 | if (c == NULL) { | |
b872f7f0 | 180 | logit("channel_by_id: %d: bad id: channel free", id); |
7368a6c8 | 181 | return NULL; |
182 | } | |
183 | return c; | |
184 | } | |
185 | ||
b872f7f0 | 186 | /* |
187 | * Returns the channel if it is allowed to receive protocol messages. | |
188 | * Private channels, like listening sockets, may not receive messages. | |
189 | */ | |
190 | Channel * | |
191 | channel_lookup(int id) | |
192 | { | |
193 | Channel *c; | |
194 | ||
195 | if ((c = channel_by_id(id)) == NULL) | |
196 | return (NULL); | |
197 | ||
c8e9c167 | 198 | switch (c->type) { |
b872f7f0 | 199 | case SSH_CHANNEL_X11_OPEN: |
200 | case SSH_CHANNEL_LARVAL: | |
201 | case SSH_CHANNEL_CONNECTING: | |
202 | case SSH_CHANNEL_DYNAMIC: | |
203 | case SSH_CHANNEL_OPENING: | |
204 | case SSH_CHANNEL_OPEN: | |
205 | case SSH_CHANNEL_INPUT_DRAINING: | |
206 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
207 | return (c); | |
b872f7f0 | 208 | } |
209 | logit("Non-public channel %d, type %d.", id, c->type); | |
210 | return (NULL); | |
211 | } | |
212 | ||
aa3378df | 213 | /* |
1d1ffb87 | 214 | * Register filedescriptors for a channel, used when allocating a channel or |
0fbe8c74 | 215 | * when the channel consumer/producer is ready, e.g. shell exec'd |
aa3378df | 216 | */ |
396c147e | 217 | static void |
a22aff1f | 218 | channel_register_fds(Channel *c, int rfd, int wfd, int efd, |
219 | int extusage, int nonblock) | |
8efc0c15 | 220 | { |
5260325f | 221 | /* Update the maximum file descriptor value. */ |
39929cdb | 222 | channel_max_fd = MAX(channel_max_fd, rfd); |
223 | channel_max_fd = MAX(channel_max_fd, wfd); | |
224 | channel_max_fd = MAX(channel_max_fd, efd); | |
225 | ||
aa3378df | 226 | /* XXX set close-on-exec -markus */ |
1d1ffb87 | 227 | |
0fbe8c74 | 228 | c->rfd = rfd; |
229 | c->wfd = wfd; | |
230 | c->sock = (rfd == wfd) ? rfd : -1; | |
5e96b616 | 231 | c->ctl_fd = -1; /* XXX: set elsewhere */ |
0fbe8c74 | 232 | c->efd = efd; |
233 | c->extended_usage = extusage; | |
a22aff1f | 234 | |
0ae4fe1d | 235 | /* XXX ugly hack: nonblock is only set by the server */ |
236 | if (nonblock && isatty(c->rfd)) { | |
d7ac5f18 | 237 | debug2("channel %d: rfd %d isatty", c->self, c->rfd); |
0ae4fe1d | 238 | c->isatty = 1; |
239 | if (!isatty(c->wfd)) { | |
94dfb550 | 240 | error("channel %d: wfd %d is not a tty?", |
0ae4fe1d | 241 | c->self, c->wfd); |
242 | } | |
243 | } else { | |
244 | c->isatty = 0; | |
245 | } | |
21c2c5cd | 246 | c->wfd_isatty = isatty(c->wfd); |
0ae4fe1d | 247 | |
a22aff1f | 248 | /* enable nonblocking mode */ |
249 | if (nonblock) { | |
250 | if (rfd != -1) | |
251 | set_nonblock(rfd); | |
252 | if (wfd != -1) | |
253 | set_nonblock(wfd); | |
254 | if (efd != -1) | |
255 | set_nonblock(efd); | |
256 | } | |
0fbe8c74 | 257 | } |
258 | ||
259 | /* | |
260 | * Allocate a new channel object and set its type and socket. This will cause | |
261 | * remote_name to be freed. | |
262 | */ | |
719fc62f | 263 | Channel * |
0fbe8c74 | 264 | channel_new(char *ctype, int type, int rfd, int wfd, int efd, |
f91d9a89 | 265 | u_int window, u_int maxpack, int extusage, char *remote_name, int nonblock) |
0fbe8c74 | 266 | { |
9a995072 | 267 | int found; |
268 | u_int i; | |
0fbe8c74 | 269 | Channel *c; |
5260325f | 270 | |
271 | /* Do initial allocation if this is the first call. */ | |
272 | if (channels_alloc == 0) { | |
273 | channels_alloc = 10; | |
52e3daed | 274 | channels = xcalloc(channels_alloc, sizeof(Channel *)); |
5260325f | 275 | for (i = 0; i < channels_alloc; i++) |
719fc62f | 276 | channels[i] = NULL; |
5260325f | 277 | } |
278 | /* Try to find a free slot where to put the new channel. */ | |
279 | for (found = -1, i = 0; i < channels_alloc; i++) | |
719fc62f | 280 | if (channels[i] == NULL) { |
5260325f | 281 | /* Found a free slot. */ |
9a995072 | 282 | found = (int)i; |
5260325f | 283 | break; |
284 | } | |
9a995072 | 285 | if (found < 0) { |
aa3378df | 286 | /* There are no free slots. Take last+1 slot and expand the array. */ |
5260325f | 287 | found = channels_alloc; |
5df8c731 | 288 | if (channels_alloc > 10000) |
289 | fatal("channel_new: internal error: channels_alloc %d " | |
290 | "too big.", channels_alloc); | |
c5d10563 | 291 | channels = xrealloc(channels, channels_alloc + 10, |
292 | sizeof(Channel *)); | |
20419cc1 | 293 | channels_alloc += 10; |
de273eef | 294 | debug2("channel: expanding %d", channels_alloc); |
5260325f | 295 | for (i = found; i < channels_alloc; i++) |
719fc62f | 296 | channels[i] = NULL; |
5260325f | 297 | } |
719fc62f | 298 | /* Initialize and return new channel. */ |
52e3daed | 299 | c = channels[found] = xcalloc(1, sizeof(Channel)); |
5260325f | 300 | buffer_init(&c->input); |
301 | buffer_init(&c->output); | |
7368a6c8 | 302 | buffer_init(&c->extended); |
70bef40e | 303 | c->ostate = CHAN_OUTPUT_OPEN; |
304 | c->istate = CHAN_INPUT_OPEN; | |
305 | c->flags = 0; | |
a22aff1f | 306 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock); |
5260325f | 307 | c->self = found; |
308 | c->type = type; | |
7368a6c8 | 309 | c->ctype = ctype; |
0b242b12 | 310 | c->local_window = window; |
311 | c->local_window_max = window; | |
312 | c->local_consumed = 0; | |
313 | c->local_maxpacket = maxpack; | |
5260325f | 314 | c->remote_id = -1; |
0d942eff | 315 | c->remote_name = xstrdup(remote_name); |
7368a6c8 | 316 | c->remote_window = 0; |
317 | c->remote_maxpacket = 0; | |
a5f82435 | 318 | c->force_drain = 0; |
ac151b18 | 319 | c->single_connection = 0; |
3cf2be58 | 320 | c->detach_user = NULL; |
8cd0437d | 321 | c->detach_close = 0; |
05ca0898 | 322 | c->confirm = NULL; |
5e96b616 | 323 | c->confirm_ctx = NULL; |
2e73a022 | 324 | c->input_filter = NULL; |
c1c6a032 | 325 | c->output_filter = NULL; |
5260325f | 326 | debug("channel %d: new [%s]", found, remote_name); |
719fc62f | 327 | return c; |
7368a6c8 | 328 | } |
8efc0c15 | 329 | |
489aa2e9 | 330 | static int |
331 | channel_find_maxfd(void) | |
332 | { | |
9a995072 | 333 | u_int i; |
334 | int max = 0; | |
489aa2e9 | 335 | Channel *c; |
336 | ||
337 | for (i = 0; i < channels_alloc; i++) { | |
338 | c = channels[i]; | |
339 | if (c != NULL) { | |
340 | max = MAX(max, c->rfd); | |
341 | max = MAX(max, c->wfd); | |
342 | max = MAX(max, c->efd); | |
343 | } | |
344 | } | |
345 | return max; | |
346 | } | |
347 | ||
348 | int | |
349 | channel_close_fd(int *fdp) | |
350 | { | |
351 | int ret = 0, fd = *fdp; | |
352 | ||
353 | if (fd != -1) { | |
354 | ret = close(fd); | |
355 | *fdp = -1; | |
356 | if (fd == channel_max_fd) | |
357 | channel_max_fd = channel_find_maxfd(); | |
358 | } | |
359 | return ret; | |
360 | } | |
361 | ||
0fbe8c74 | 362 | /* Close all channel fd/socket. */ |
396c147e | 363 | static void |
0fbe8c74 | 364 | channel_close_fds(Channel *c) |
365 | { | |
5e96b616 | 366 | debug3("channel %d: close_fds r %d w %d e %d c %d", |
367 | c->self, c->rfd, c->wfd, c->efd, c->ctl_fd); | |
6fd8622b | 368 | |
489aa2e9 | 369 | channel_close_fd(&c->sock); |
5e96b616 | 370 | channel_close_fd(&c->ctl_fd); |
489aa2e9 | 371 | channel_close_fd(&c->rfd); |
372 | channel_close_fd(&c->wfd); | |
373 | channel_close_fd(&c->efd); | |
0fbe8c74 | 374 | } |
375 | ||
8e7895b8 | 376 | /* Free the channel and close its fd/socket. */ |
8e7895b8 | 377 | void |
378 | channel_free(Channel *c) | |
379 | { | |
380 | char *s; | |
9a995072 | 381 | u_int i, n; |
8e7895b8 | 382 | |
383 | for (n = 0, i = 0; i < channels_alloc; i++) | |
384 | if (channels[i]) | |
385 | n++; | |
9a995072 | 386 | debug("channel %d: free: %s, nchannels %u", c->self, |
8e7895b8 | 387 | c->remote_name ? c->remote_name : "???", n); |
388 | ||
389 | s = channel_open_message(); | |
d7ac5f18 | 390 | debug3("channel %d: status: %s", c->self, s); |
8e7895b8 | 391 | xfree(s); |
392 | ||
8e7895b8 | 393 | if (c->sock != -1) |
394 | shutdown(c->sock, SHUT_RDWR); | |
5e96b616 | 395 | if (c->ctl_fd != -1) |
396 | shutdown(c->ctl_fd, SHUT_RDWR); | |
8e7895b8 | 397 | channel_close_fds(c); |
398 | buffer_free(&c->input); | |
399 | buffer_free(&c->output); | |
400 | buffer_free(&c->extended); | |
401 | if (c->remote_name) { | |
402 | xfree(c->remote_name); | |
403 | c->remote_name = NULL; | |
404 | } | |
405 | channels[c->self] = NULL; | |
406 | xfree(c); | |
407 | } | |
408 | ||
8e7895b8 | 409 | void |
d6746a0b | 410 | channel_free_all(void) |
8e7895b8 | 411 | { |
9a995072 | 412 | u_int i; |
8e7895b8 | 413 | |
d6746a0b | 414 | for (i = 0; i < channels_alloc; i++) |
415 | if (channels[i] != NULL) | |
416 | channel_free(channels[i]); | |
8e7895b8 | 417 | } |
418 | ||
419 | /* | |
420 | * Closes the sockets/fds of all channels. This is used to close extra file | |
421 | * descriptors after a fork. | |
422 | */ | |
8e7895b8 | 423 | void |
d5bb9418 | 424 | channel_close_all(void) |
8e7895b8 | 425 | { |
9a995072 | 426 | u_int i; |
8e7895b8 | 427 | |
428 | for (i = 0; i < channels_alloc; i++) | |
429 | if (channels[i] != NULL) | |
430 | channel_close_fds(channels[i]); | |
431 | } | |
432 | ||
3cf2be58 | 433 | /* |
434 | * Stop listening to channels. | |
435 | */ | |
3cf2be58 | 436 | void |
437 | channel_stop_listening(void) | |
438 | { | |
9a995072 | 439 | u_int i; |
3cf2be58 | 440 | Channel *c; |
441 | ||
442 | for (i = 0; i < channels_alloc; i++) { | |
443 | c = channels[i]; | |
444 | if (c != NULL) { | |
445 | switch (c->type) { | |
446 | case SSH_CHANNEL_AUTH_SOCKET: | |
447 | case SSH_CHANNEL_PORT_LISTENER: | |
448 | case SSH_CHANNEL_RPORT_LISTENER: | |
449 | case SSH_CHANNEL_X11_LISTENER: | |
489aa2e9 | 450 | channel_close_fd(&c->sock); |
3cf2be58 | 451 | channel_free(c); |
452 | break; | |
453 | } | |
454 | } | |
455 | } | |
456 | } | |
457 | ||
8e7895b8 | 458 | /* |
459 | * Returns true if no channel has too much buffered data, and false if one or | |
460 | * more channel is overfull. | |
461 | */ | |
8e7895b8 | 462 | int |
d5bb9418 | 463 | channel_not_very_much_buffered_data(void) |
8e7895b8 | 464 | { |
465 | u_int i; | |
466 | Channel *c; | |
467 | ||
468 | for (i = 0; i < channels_alloc; i++) { | |
469 | c = channels[i]; | |
470 | if (c != NULL && c->type == SSH_CHANNEL_OPEN) { | |
0c139bd1 | 471 | #if 0 |
472 | if (!compat20 && | |
473 | buffer_len(&c->input) > packet_get_maxsize()) { | |
faa483fa | 474 | debug2("channel %d: big input buffer %d", |
8e7895b8 | 475 | c->self, buffer_len(&c->input)); |
476 | return 0; | |
477 | } | |
0c139bd1 | 478 | #endif |
8e7895b8 | 479 | if (buffer_len(&c->output) > packet_get_maxsize()) { |
a27002e5 | 480 | debug2("channel %d: big output buffer %u > %u", |
0c139bd1 | 481 | c->self, buffer_len(&c->output), |
482 | packet_get_maxsize()); | |
8e7895b8 | 483 | return 0; |
484 | } | |
485 | } | |
486 | } | |
487 | return 1; | |
488 | } | |
489 | ||
490 | /* Returns true if any channel is still open. */ | |
8e7895b8 | 491 | int |
d5bb9418 | 492 | channel_still_open(void) |
8e7895b8 | 493 | { |
9a995072 | 494 | u_int i; |
8e7895b8 | 495 | Channel *c; |
496 | ||
497 | for (i = 0; i < channels_alloc; i++) { | |
498 | c = channels[i]; | |
499 | if (c == NULL) | |
500 | continue; | |
501 | switch (c->type) { | |
502 | case SSH_CHANNEL_X11_LISTENER: | |
503 | case SSH_CHANNEL_PORT_LISTENER: | |
504 | case SSH_CHANNEL_RPORT_LISTENER: | |
505 | case SSH_CHANNEL_CLOSED: | |
506 | case SSH_CHANNEL_AUTH_SOCKET: | |
507 | case SSH_CHANNEL_DYNAMIC: | |
508 | case SSH_CHANNEL_CONNECTING: | |
509 | case SSH_CHANNEL_ZOMBIE: | |
510 | continue; | |
511 | case SSH_CHANNEL_LARVAL: | |
512 | if (!compat20) | |
513 | fatal("cannot happen: SSH_CHANNEL_LARVAL"); | |
514 | continue; | |
515 | case SSH_CHANNEL_OPENING: | |
516 | case SSH_CHANNEL_OPEN: | |
517 | case SSH_CHANNEL_X11_OPEN: | |
518 | return 1; | |
519 | case SSH_CHANNEL_INPUT_DRAINING: | |
520 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
521 | if (!compat13) | |
522 | fatal("cannot happen: OUT_DRAIN"); | |
523 | return 1; | |
524 | default: | |
525 | fatal("channel_still_open: bad channel type %d", c->type); | |
526 | /* NOTREACHED */ | |
527 | } | |
528 | } | |
529 | return 0; | |
530 | } | |
531 | ||
532 | /* Returns the id of an open channel suitable for keepaliving */ | |
8e7895b8 | 533 | int |
d5bb9418 | 534 | channel_find_open(void) |
8e7895b8 | 535 | { |
9a995072 | 536 | u_int i; |
8e7895b8 | 537 | Channel *c; |
538 | ||
539 | for (i = 0; i < channels_alloc; i++) { | |
540 | c = channels[i]; | |
13de3560 | 541 | if (c == NULL || c->remote_id < 0) |
8e7895b8 | 542 | continue; |
543 | switch (c->type) { | |
544 | case SSH_CHANNEL_CLOSED: | |
545 | case SSH_CHANNEL_DYNAMIC: | |
546 | case SSH_CHANNEL_X11_LISTENER: | |
547 | case SSH_CHANNEL_PORT_LISTENER: | |
548 | case SSH_CHANNEL_RPORT_LISTENER: | |
549 | case SSH_CHANNEL_OPENING: | |
550 | case SSH_CHANNEL_CONNECTING: | |
551 | case SSH_CHANNEL_ZOMBIE: | |
552 | continue; | |
553 | case SSH_CHANNEL_LARVAL: | |
554 | case SSH_CHANNEL_AUTH_SOCKET: | |
555 | case SSH_CHANNEL_OPEN: | |
556 | case SSH_CHANNEL_X11_OPEN: | |
557 | return i; | |
558 | case SSH_CHANNEL_INPUT_DRAINING: | |
559 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
560 | if (!compat13) | |
561 | fatal("cannot happen: OUT_DRAIN"); | |
562 | return i; | |
563 | default: | |
564 | fatal("channel_find_open: bad channel type %d", c->type); | |
565 | /* NOTREACHED */ | |
566 | } | |
567 | } | |
568 | return -1; | |
569 | } | |
570 | ||
571 | ||
572 | /* | |
573 | * Returns a message describing the currently open forwarded connections, | |
574 | * suitable for sending to the client. The message contains crlf pairs for | |
575 | * newlines. | |
576 | */ | |
8e7895b8 | 577 | char * |
d5bb9418 | 578 | channel_open_message(void) |
8e7895b8 | 579 | { |
580 | Buffer buffer; | |
581 | Channel *c; | |
582 | char buf[1024], *cp; | |
9a995072 | 583 | u_int i; |
8e7895b8 | 584 | |
585 | buffer_init(&buffer); | |
586 | snprintf(buf, sizeof buf, "The following connections are open:\r\n"); | |
587 | buffer_append(&buffer, buf, strlen(buf)); | |
588 | for (i = 0; i < channels_alloc; i++) { | |
589 | c = channels[i]; | |
590 | if (c == NULL) | |
591 | continue; | |
592 | switch (c->type) { | |
593 | case SSH_CHANNEL_X11_LISTENER: | |
594 | case SSH_CHANNEL_PORT_LISTENER: | |
595 | case SSH_CHANNEL_RPORT_LISTENER: | |
596 | case SSH_CHANNEL_CLOSED: | |
597 | case SSH_CHANNEL_AUTH_SOCKET: | |
598 | case SSH_CHANNEL_ZOMBIE: | |
599 | continue; | |
600 | case SSH_CHANNEL_LARVAL: | |
601 | case SSH_CHANNEL_OPENING: | |
602 | case SSH_CHANNEL_CONNECTING: | |
603 | case SSH_CHANNEL_DYNAMIC: | |
604 | case SSH_CHANNEL_OPEN: | |
605 | case SSH_CHANNEL_X11_OPEN: | |
606 | case SSH_CHANNEL_INPUT_DRAINING: | |
607 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
5e96b616 | 608 | snprintf(buf, sizeof buf, |
609 | " #%d %.300s (t%d r%d i%d/%d o%d/%d fd %d/%d cfd %d)\r\n", | |
8e7895b8 | 610 | c->self, c->remote_name, |
611 | c->type, c->remote_id, | |
612 | c->istate, buffer_len(&c->input), | |
613 | c->ostate, buffer_len(&c->output), | |
5e96b616 | 614 | c->rfd, c->wfd, c->ctl_fd); |
8e7895b8 | 615 | buffer_append(&buffer, buf, strlen(buf)); |
616 | continue; | |
617 | default: | |
618 | fatal("channel_open_message: bad channel type %d", c->type); | |
619 | /* NOTREACHED */ | |
620 | } | |
621 | } | |
622 | buffer_append(&buffer, "\0", 1); | |
623 | cp = xstrdup(buffer_ptr(&buffer)); | |
624 | buffer_free(&buffer); | |
625 | return cp; | |
626 | } | |
627 | ||
628 | void | |
629 | channel_send_open(int id) | |
630 | { | |
631 | Channel *c = channel_lookup(id); | |
e1feb9bf | 632 | |
8e7895b8 | 633 | if (c == NULL) { |
bbe88b6d | 634 | logit("channel_send_open: %d: bad id", id); |
8e7895b8 | 635 | return; |
636 | } | |
6226a8f8 | 637 | debug2("channel %d: send open", id); |
8e7895b8 | 638 | packet_start(SSH2_MSG_CHANNEL_OPEN); |
639 | packet_put_cstring(c->ctype); | |
640 | packet_put_int(c->self); | |
641 | packet_put_int(c->local_window); | |
642 | packet_put_int(c->local_maxpacket); | |
643 | packet_send(); | |
644 | } | |
645 | ||
646 | void | |
6226a8f8 | 647 | channel_request_start(int id, char *service, int wantconfirm) |
8e7895b8 | 648 | { |
6226a8f8 | 649 | Channel *c = channel_lookup(id); |
e1feb9bf | 650 | |
8e7895b8 | 651 | if (c == NULL) { |
bbe88b6d | 652 | logit("channel_request_start: %d: unknown channel id", id); |
8e7895b8 | 653 | return; |
654 | } | |
5e96b616 | 655 | debug2("channel %d: request %s confirm %d", id, service, wantconfirm); |
8e7895b8 | 656 | packet_start(SSH2_MSG_CHANNEL_REQUEST); |
657 | packet_put_int(c->remote_id); | |
658 | packet_put_cstring(service); | |
659 | packet_put_char(wantconfirm); | |
660 | } | |
a7137f6b | 661 | |
8e7895b8 | 662 | void |
5e96b616 | 663 | channel_register_confirm(int id, channel_callback_fn *fn, void *ctx) |
8e7895b8 | 664 | { |
665 | Channel *c = channel_lookup(id); | |
e1feb9bf | 666 | |
8e7895b8 | 667 | if (c == NULL) { |
bbe88b6d | 668 | logit("channel_register_comfirm: %d: bad id", id); |
8e7895b8 | 669 | return; |
670 | } | |
05ca0898 | 671 | c->confirm = fn; |
5e96b616 | 672 | c->confirm_ctx = ctx; |
8e7895b8 | 673 | } |
a7137f6b | 674 | |
8e7895b8 | 675 | void |
8cd0437d | 676 | channel_register_cleanup(int id, channel_callback_fn *fn, int do_close) |
8e7895b8 | 677 | { |
b872f7f0 | 678 | Channel *c = channel_by_id(id); |
e1feb9bf | 679 | |
8e7895b8 | 680 | if (c == NULL) { |
bbe88b6d | 681 | logit("channel_register_cleanup: %d: bad id", id); |
8e7895b8 | 682 | return; |
683 | } | |
3cf2be58 | 684 | c->detach_user = fn; |
8cd0437d | 685 | c->detach_close = do_close; |
8e7895b8 | 686 | } |
a7137f6b | 687 | |
8e7895b8 | 688 | void |
689 | channel_cancel_cleanup(int id) | |
690 | { | |
b872f7f0 | 691 | Channel *c = channel_by_id(id); |
e1feb9bf | 692 | |
8e7895b8 | 693 | if (c == NULL) { |
bbe88b6d | 694 | logit("channel_cancel_cleanup: %d: bad id", id); |
8e7895b8 | 695 | return; |
696 | } | |
3cf2be58 | 697 | c->detach_user = NULL; |
8cd0437d | 698 | c->detach_close = 0; |
8e7895b8 | 699 | } |
a7137f6b | 700 | |
8e7895b8 | 701 | void |
c1c6a032 | 702 | channel_register_filter(int id, channel_infilter_fn *ifn, |
703 | channel_outfilter_fn *ofn) | |
8e7895b8 | 704 | { |
705 | Channel *c = channel_lookup(id); | |
e1feb9bf | 706 | |
8e7895b8 | 707 | if (c == NULL) { |
bbe88b6d | 708 | logit("channel_register_filter: %d: bad id", id); |
8e7895b8 | 709 | return; |
710 | } | |
c1c6a032 | 711 | c->input_filter = ifn; |
712 | c->output_filter = ofn; | |
8e7895b8 | 713 | } |
714 | ||
6ae2364d | 715 | void |
8e7895b8 | 716 | channel_set_fds(int id, int rfd, int wfd, int efd, |
399d1ea6 | 717 | int extusage, int nonblock, u_int window_max) |
8efc0c15 | 718 | { |
8e7895b8 | 719 | Channel *c = channel_lookup(id); |
e1feb9bf | 720 | |
8e7895b8 | 721 | if (c == NULL || c->type != SSH_CHANNEL_LARVAL) |
722 | fatal("channel_activate for non-larval channel %d.", id); | |
723 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock); | |
724 | c->type = SSH_CHANNEL_OPEN; | |
399d1ea6 | 725 | c->local_window = c->local_window_max = window_max; |
8e7895b8 | 726 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
727 | packet_put_int(c->remote_id); | |
728 | packet_put_int(c->local_window); | |
729 | packet_send(); | |
8efc0c15 | 730 | } |
731 | ||
aa3378df | 732 | /* |
7368a6c8 | 733 | * 'channel_pre*' are called just before select() to add any bits relevant to |
734 | * channels in the select bitmasks. | |
aa3378df | 735 | */ |
7368a6c8 | 736 | /* |
737 | * 'channel_post*': perform any appropriate operations for channels which | |
738 | * have events pending. | |
739 | */ | |
c8e9c167 | 740 | typedef void chan_fn(Channel *c, fd_set *readset, fd_set *writeset); |
7368a6c8 | 741 | chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE]; |
742 | chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE]; | |
8efc0c15 | 743 | |
ebb90778 | 744 | /* ARGSUSED */ |
396c147e | 745 | static void |
c8e9c167 | 746 | channel_pre_listener(Channel *c, fd_set *readset, fd_set *writeset) |
8efc0c15 | 747 | { |
7368a6c8 | 748 | FD_SET(c->sock, readset); |
749 | } | |
5260325f | 750 | |
ebb90778 | 751 | /* ARGSUSED */ |
396c147e | 752 | static void |
c8e9c167 | 753 | channel_pre_connecting(Channel *c, fd_set *readset, fd_set *writeset) |
97fb6912 | 754 | { |
755 | debug3("channel %d: waiting for connection", c->self); | |
756 | FD_SET(c->sock, writeset); | |
757 | } | |
758 | ||
396c147e | 759 | static void |
c8e9c167 | 760 | channel_pre_open_13(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 761 | { |
762 | if (buffer_len(&c->input) < packet_get_maxsize()) | |
763 | FD_SET(c->sock, readset); | |
764 | if (buffer_len(&c->output) > 0) | |
765 | FD_SET(c->sock, writeset); | |
766 | } | |
5260325f | 767 | |
396c147e | 768 | static void |
c8e9c167 | 769 | channel_pre_open(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 770 | { |
0c0738d5 | 771 | u_int limit = compat20 ? c->remote_window : packet_get_maxsize(); |
5260325f | 772 | |
7e7327a1 | 773 | if (c->istate == CHAN_INPUT_OPEN && |
0c0738d5 | 774 | limit > 0 && |
69d9d413 | 775 | buffer_len(&c->input) < limit && |
776 | buffer_check_alloc(&c->input, CHAN_RBUF)) | |
7e7327a1 | 777 | FD_SET(c->rfd, readset); |
778 | if (c->ostate == CHAN_OUTPUT_OPEN || | |
779 | c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { | |
780 | if (buffer_len(&c->output) > 0) { | |
781 | FD_SET(c->wfd, writeset); | |
782 | } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { | |
d2296ed7 | 783 | if (CHANNEL_EFD_OUTPUT_ACTIVE(c)) |
4e2e5cfd | 784 | debug2("channel %d: obuf_empty delayed efd %d/(%d)", |
785 | c->self, c->efd, buffer_len(&c->extended)); | |
d2296ed7 | 786 | else |
787 | chan_obuf_empty(c); | |
7e7327a1 | 788 | } |
789 | } | |
790 | /** XXX check close conditions, too */ | |
0c0738d5 | 791 | if (compat20 && c->efd != -1) { |
7e7327a1 | 792 | if (c->extended_usage == CHAN_EXTENDED_WRITE && |
793 | buffer_len(&c->extended) > 0) | |
794 | FD_SET(c->efd, writeset); | |
d2296ed7 | 795 | else if (!(c->flags & CHAN_EOF_SENT) && |
796 | c->extended_usage == CHAN_EXTENDED_READ && | |
7e7327a1 | 797 | buffer_len(&c->extended) < c->remote_window) |
798 | FD_SET(c->efd, readset); | |
799 | } | |
5e96b616 | 800 | /* XXX: What about efd? races? */ |
f2107e97 | 801 | if (compat20 && c->ctl_fd != -1 && |
5e96b616 | 802 | c->istate == CHAN_INPUT_OPEN && c->ostate == CHAN_OUTPUT_OPEN) |
803 | FD_SET(c->ctl_fd, readset); | |
7e7327a1 | 804 | } |
805 | ||
ebb90778 | 806 | /* ARGSUSED */ |
396c147e | 807 | static void |
c8e9c167 | 808 | channel_pre_input_draining(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 809 | { |
810 | if (buffer_len(&c->input) == 0) { | |
811 | packet_start(SSH_MSG_CHANNEL_CLOSE); | |
812 | packet_put_int(c->remote_id); | |
813 | packet_send(); | |
814 | c->type = SSH_CHANNEL_CLOSED; | |
d7ac5f18 | 815 | debug2("channel %d: closing after input drain.", c->self); |
7368a6c8 | 816 | } |
817 | } | |
5260325f | 818 | |
ebb90778 | 819 | /* ARGSUSED */ |
396c147e | 820 | static void |
c8e9c167 | 821 | channel_pre_output_draining(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 822 | { |
823 | if (buffer_len(&c->output) == 0) | |
719fc62f | 824 | chan_mark_dead(c); |
6ae2364d | 825 | else |
7368a6c8 | 826 | FD_SET(c->sock, writeset); |
827 | } | |
5260325f | 828 | |
7368a6c8 | 829 | /* |
830 | * This is a special state for X11 authentication spoofing. An opened X11 | |
831 | * connection (when authentication spoofing is being done) remains in this | |
832 | * state until the first packet has been completely read. The authentication | |
833 | * data in that packet is then substituted by the real data if it matches the | |
834 | * fake data, and the channel is put into normal mode. | |
0b242b12 | 835 | * XXX All this happens at the client side. |
8e7895b8 | 836 | * Returns: 0 = need more data, -1 = wrong cookie, 1 = ok |
7368a6c8 | 837 | */ |
396c147e | 838 | static int |
8e7895b8 | 839 | x11_open_helper(Buffer *b) |
7368a6c8 | 840 | { |
1e3b8b07 | 841 | u_char *ucp; |
842 | u_int proto_len, data_len; | |
5260325f | 843 | |
7368a6c8 | 844 | /* Check if the fixed size part of the packet is in buffer. */ |
8e7895b8 | 845 | if (buffer_len(b) < 12) |
7368a6c8 | 846 | return 0; |
847 | ||
848 | /* Parse the lengths of variable-length fields. */ | |
20905a8e | 849 | ucp = buffer_ptr(b); |
7368a6c8 | 850 | if (ucp[0] == 0x42) { /* Byte order MSB first. */ |
851 | proto_len = 256 * ucp[6] + ucp[7]; | |
852 | data_len = 256 * ucp[8] + ucp[9]; | |
853 | } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */ | |
854 | proto_len = ucp[6] + 256 * ucp[7]; | |
855 | data_len = ucp[8] + 256 * ucp[9]; | |
856 | } else { | |
d7ac5f18 | 857 | debug2("Initial X11 packet contains bad byte order byte: 0x%x", |
184eed6a | 858 | ucp[0]); |
7368a6c8 | 859 | return -1; |
860 | } | |
5260325f | 861 | |
7368a6c8 | 862 | /* Check if the whole packet is in buffer. */ |
8e7895b8 | 863 | if (buffer_len(b) < |
7368a6c8 | 864 | 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3)) |
865 | return 0; | |
5260325f | 866 | |
7368a6c8 | 867 | /* Check if authentication protocol matches. */ |
868 | if (proto_len != strlen(x11_saved_proto) || | |
869 | memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) { | |
d7ac5f18 | 870 | debug2("X11 connection uses different authentication protocol."); |
7368a6c8 | 871 | return -1; |
872 | } | |
873 | /* Check if authentication data matches our fake data. */ | |
874 | if (data_len != x11_fake_data_len || | |
875 | memcmp(ucp + 12 + ((proto_len + 3) & ~3), | |
876 | x11_fake_data, x11_fake_data_len) != 0) { | |
d7ac5f18 | 877 | debug2("X11 auth data does not match fake data."); |
7368a6c8 | 878 | return -1; |
879 | } | |
880 | /* Check fake data length */ | |
881 | if (x11_fake_data_len != x11_saved_data_len) { | |
882 | error("X11 fake_data_len %d != saved_data_len %d", | |
883 | x11_fake_data_len, x11_saved_data_len); | |
884 | return -1; | |
885 | } | |
886 | /* | |
887 | * Received authentication protocol and data match | |
888 | * our fake data. Substitute the fake data with real | |
889 | * data. | |
890 | */ | |
891 | memcpy(ucp + 12 + ((proto_len + 3) & ~3), | |
892 | x11_saved_data, x11_saved_data_len); | |
893 | return 1; | |
894 | } | |
5260325f | 895 | |
396c147e | 896 | static void |
c8e9c167 | 897 | channel_pre_x11_open_13(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 898 | { |
8e7895b8 | 899 | int ret = x11_open_helper(&c->output); |
e1feb9bf | 900 | |
7368a6c8 | 901 | if (ret == 1) { |
902 | /* Start normal processing for the channel. */ | |
903 | c->type = SSH_CHANNEL_OPEN; | |
a8be9f80 | 904 | channel_pre_open_13(c, readset, writeset); |
7368a6c8 | 905 | } else if (ret == -1) { |
906 | /* | |
907 | * We have received an X11 connection that has bad | |
908 | * authentication information. | |
909 | */ | |
bbe88b6d | 910 | logit("X11 connection rejected because of wrong authentication."); |
7368a6c8 | 911 | buffer_clear(&c->input); |
912 | buffer_clear(&c->output); | |
489aa2e9 | 913 | channel_close_fd(&c->sock); |
7368a6c8 | 914 | c->sock = -1; |
915 | c->type = SSH_CHANNEL_CLOSED; | |
916 | packet_start(SSH_MSG_CHANNEL_CLOSE); | |
917 | packet_put_int(c->remote_id); | |
918 | packet_send(); | |
919 | } | |
920 | } | |
5260325f | 921 | |
396c147e | 922 | static void |
c8e9c167 | 923 | channel_pre_x11_open(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 924 | { |
8e7895b8 | 925 | int ret = x11_open_helper(&c->output); |
a5f82435 | 926 | |
927 | /* c->force_drain = 1; */ | |
928 | ||
7368a6c8 | 929 | if (ret == 1) { |
930 | c->type = SSH_CHANNEL_OPEN; | |
0c0738d5 | 931 | channel_pre_open(c, readset, writeset); |
7368a6c8 | 932 | } else if (ret == -1) { |
bbe88b6d | 933 | logit("X11 connection rejected because of wrong authentication."); |
d7ac5f18 | 934 | debug2("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate); |
8341f420 | 935 | chan_read_failed(c); |
936 | buffer_clear(&c->input); | |
937 | chan_ibuf_empty(c); | |
938 | buffer_clear(&c->output); | |
939 | /* for proto v1, the peer will send an IEOF */ | |
940 | if (compat20) | |
941 | chan_write_failed(c); | |
942 | else | |
943 | c->type = SSH_CHANNEL_OPEN; | |
d7ac5f18 | 944 | debug2("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate); |
7368a6c8 | 945 | } |
946 | } | |
5260325f | 947 | |
28b9cb4d | 948 | /* try to decode a socks4 header */ |
ebb90778 | 949 | /* ARGSUSED */ |
396c147e | 950 | static int |
c8e9c167 | 951 | channel_decode_socks4(Channel *c, fd_set *readset, fd_set *writeset) |
0490e609 | 952 | { |
661e45a0 | 953 | char *p, *host; |
2ceb8101 | 954 | u_int len, have, i, found; |
184eed6a | 955 | char username[256]; |
0490e609 | 956 | struct { |
957 | u_int8_t version; | |
958 | u_int8_t command; | |
959 | u_int16_t dest_port; | |
28b9cb4d | 960 | struct in_addr dest_addr; |
0490e609 | 961 | } s4_req, s4_rsp; |
962 | ||
28b9cb4d | 963 | debug2("channel %d: decode socks4", c->self); |
53b8fe68 | 964 | |
965 | have = buffer_len(&c->input); | |
966 | len = sizeof(s4_req); | |
967 | if (have < len) | |
968 | return 0; | |
969 | p = buffer_ptr(&c->input); | |
970 | for (found = 0, i = len; i < have; i++) { | |
971 | if (p[i] == '\0') { | |
972 | found = 1; | |
973 | break; | |
974 | } | |
975 | if (i > 1024) { | |
976 | /* the peer is probably sending garbage */ | |
977 | debug("channel %d: decode socks4: too long", | |
978 | c->self); | |
979 | return -1; | |
980 | } | |
981 | } | |
982 | if (!found) | |
983 | return 0; | |
0490e609 | 984 | buffer_get(&c->input, (char *)&s4_req.version, 1); |
985 | buffer_get(&c->input, (char *)&s4_req.command, 1); | |
986 | buffer_get(&c->input, (char *)&s4_req.dest_port, 2); | |
28b9cb4d | 987 | buffer_get(&c->input, (char *)&s4_req.dest_addr, 4); |
53b8fe68 | 988 | have = buffer_len(&c->input); |
0490e609 | 989 | p = buffer_ptr(&c->input); |
990 | len = strlen(p); | |
6683b40f | 991 | debug2("channel %d: decode socks4: user %s/%d", c->self, p, len); |
0490e609 | 992 | if (len > have) |
28b9cb4d | 993 | fatal("channel %d: decode socks4: len %d > have %d", |
0490e609 | 994 | c->self, len, have); |
995 | strlcpy(username, p, sizeof(username)); | |
996 | buffer_consume(&c->input, len); | |
997 | buffer_consume(&c->input, 1); /* trailing '\0' */ | |
998 | ||
28b9cb4d | 999 | host = inet_ntoa(s4_req.dest_addr); |
0490e609 | 1000 | strlcpy(c->path, host, sizeof(c->path)); |
1001 | c->host_port = ntohs(s4_req.dest_port); | |
184eed6a | 1002 | |
d7ac5f18 | 1003 | debug2("channel %d: dynamic request: socks4 host %s port %u command %u", |
6683b40f | 1004 | c->self, host, c->host_port, s4_req.command); |
0490e609 | 1005 | |
28b9cb4d | 1006 | if (s4_req.command != 1) { |
1007 | debug("channel %d: cannot handle: socks4 cn %d", | |
1008 | c->self, s4_req.command); | |
1009 | return -1; | |
0490e609 | 1010 | } |
28b9cb4d | 1011 | s4_rsp.version = 0; /* vn: 0 for reply */ |
1012 | s4_rsp.command = 90; /* cd: req granted */ | |
0490e609 | 1013 | s4_rsp.dest_port = 0; /* ignored */ |
28b9cb4d | 1014 | s4_rsp.dest_addr.s_addr = INADDR_ANY; /* ignored */ |
15dd2c4f | 1015 | buffer_append(&c->output, &s4_rsp, sizeof(s4_rsp)); |
28b9cb4d | 1016 | return 1; |
0490e609 | 1017 | } |
1018 | ||
f49658f5 | 1019 | /* try to decode a socks5 header */ |
1020 | #define SSH_SOCKS5_AUTHDONE 0x1000 | |
1021 | #define SSH_SOCKS5_NOAUTH 0x00 | |
1022 | #define SSH_SOCKS5_IPV4 0x01 | |
1023 | #define SSH_SOCKS5_DOMAIN 0x03 | |
1024 | #define SSH_SOCKS5_IPV6 0x04 | |
1025 | #define SSH_SOCKS5_CONNECT 0x01 | |
1026 | #define SSH_SOCKS5_SUCCESS 0x00 | |
1027 | ||
ebb90778 | 1028 | /* ARGSUSED */ |
f49658f5 | 1029 | static int |
c8e9c167 | 1030 | channel_decode_socks5(Channel *c, fd_set *readset, fd_set *writeset) |
f49658f5 | 1031 | { |
1032 | struct { | |
1033 | u_int8_t version; | |
1034 | u_int8_t command; | |
1035 | u_int8_t reserved; | |
1036 | u_int8_t atyp; | |
1037 | } s5_req, s5_rsp; | |
1038 | u_int16_t dest_port; | |
1039 | u_char *p, dest_addr[255+1]; | |
a217e418 | 1040 | u_int have, need, i, found, nmethods, addrlen, af; |
f49658f5 | 1041 | |
1042 | debug2("channel %d: decode socks5", c->self); | |
1043 | p = buffer_ptr(&c->input); | |
1044 | if (p[0] != 0x05) | |
1045 | return -1; | |
1046 | have = buffer_len(&c->input); | |
1047 | if (!(c->flags & SSH_SOCKS5_AUTHDONE)) { | |
1048 | /* format: ver | nmethods | methods */ | |
aff51935 | 1049 | if (have < 2) |
f49658f5 | 1050 | return 0; |
1051 | nmethods = p[1]; | |
1052 | if (have < nmethods + 2) | |
1053 | return 0; | |
1054 | /* look for method: "NO AUTHENTICATION REQUIRED" */ | |
4f6e2ba9 | 1055 | for (found = 0, i = 2; i < nmethods + 2; i++) { |
d4f40d92 | 1056 | if (p[i] == SSH_SOCKS5_NOAUTH) { |
f49658f5 | 1057 | found = 1; |
1058 | break; | |
1059 | } | |
1060 | } | |
1061 | if (!found) { | |
1062 | debug("channel %d: method SSH_SOCKS5_NOAUTH not found", | |
1063 | c->self); | |
1064 | return -1; | |
1065 | } | |
1066 | buffer_consume(&c->input, nmethods + 2); | |
1067 | buffer_put_char(&c->output, 0x05); /* version */ | |
1068 | buffer_put_char(&c->output, SSH_SOCKS5_NOAUTH); /* method */ | |
1069 | FD_SET(c->sock, writeset); | |
1070 | c->flags |= SSH_SOCKS5_AUTHDONE; | |
1071 | debug2("channel %d: socks5 auth done", c->self); | |
1072 | return 0; /* need more */ | |
1073 | } | |
1074 | debug2("channel %d: socks5 post auth", c->self); | |
1075 | if (have < sizeof(s5_req)+1) | |
1076 | return 0; /* need more */ | |
5b5f6af7 | 1077 | memcpy(&s5_req, p, sizeof(s5_req)); |
f49658f5 | 1078 | if (s5_req.version != 0x05 || |
1079 | s5_req.command != SSH_SOCKS5_CONNECT || | |
1080 | s5_req.reserved != 0x00) { | |
d7ac5f18 | 1081 | debug2("channel %d: only socks5 connect supported", c->self); |
f49658f5 | 1082 | return -1; |
1083 | } | |
f8cc7664 | 1084 | switch (s5_req.atyp){ |
f49658f5 | 1085 | case SSH_SOCKS5_IPV4: |
1086 | addrlen = 4; | |
1087 | af = AF_INET; | |
1088 | break; | |
1089 | case SSH_SOCKS5_DOMAIN: | |
1090 | addrlen = p[sizeof(s5_req)]; | |
1091 | af = -1; | |
1092 | break; | |
1093 | case SSH_SOCKS5_IPV6: | |
1094 | addrlen = 16; | |
1095 | af = AF_INET6; | |
1096 | break; | |
1097 | default: | |
d7ac5f18 | 1098 | debug2("channel %d: bad socks5 atyp %d", c->self, s5_req.atyp); |
f49658f5 | 1099 | return -1; |
1100 | } | |
a217e418 | 1101 | need = sizeof(s5_req) + addrlen + 2; |
1102 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) | |
1103 | need++; | |
1104 | if (have < need) | |
f49658f5 | 1105 | return 0; |
1106 | buffer_consume(&c->input, sizeof(s5_req)); | |
1107 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) | |
1108 | buffer_consume(&c->input, 1); /* host string length */ | |
1109 | buffer_get(&c->input, (char *)&dest_addr, addrlen); | |
1110 | buffer_get(&c->input, (char *)&dest_port, 2); | |
1111 | dest_addr[addrlen] = '\0'; | |
1112 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) | |
f6be21a0 | 1113 | strlcpy(c->path, (char *)dest_addr, sizeof(c->path)); |
f49658f5 | 1114 | else if (inet_ntop(af, dest_addr, c->path, sizeof(c->path)) == NULL) |
1115 | return -1; | |
1116 | c->host_port = ntohs(dest_port); | |
b6453d99 | 1117 | |
d7ac5f18 | 1118 | debug2("channel %d: dynamic request: socks5 host %s port %u command %u", |
f49658f5 | 1119 | c->self, c->path, c->host_port, s5_req.command); |
1120 | ||
1121 | s5_rsp.version = 0x05; | |
1122 | s5_rsp.command = SSH_SOCKS5_SUCCESS; | |
1123 | s5_rsp.reserved = 0; /* ignored */ | |
1124 | s5_rsp.atyp = SSH_SOCKS5_IPV4; | |
1125 | ((struct in_addr *)&dest_addr)->s_addr = INADDR_ANY; | |
1126 | dest_port = 0; /* ignored */ | |
1127 | ||
15dd2c4f | 1128 | buffer_append(&c->output, &s5_rsp, sizeof(s5_rsp)); |
1129 | buffer_append(&c->output, &dest_addr, sizeof(struct in_addr)); | |
1130 | buffer_append(&c->output, &dest_port, sizeof(dest_port)); | |
f49658f5 | 1131 | return 1; |
1132 | } | |
1133 | ||
28b9cb4d | 1134 | /* dynamic port forwarding */ |
396c147e | 1135 | static void |
c8e9c167 | 1136 | channel_pre_dynamic(Channel *c, fd_set *readset, fd_set *writeset) |
28b9cb4d | 1137 | { |
1138 | u_char *p; | |
2ceb8101 | 1139 | u_int have; |
1140 | int ret; | |
28b9cb4d | 1141 | |
1142 | have = buffer_len(&c->input); | |
639cb8ab | 1143 | c->delayed = 0; |
28b9cb4d | 1144 | debug2("channel %d: pre_dynamic: have %d", c->self, have); |
070adba2 | 1145 | /* buffer_dump(&c->input); */ |
28b9cb4d | 1146 | /* check if the fixed size part of the packet is in buffer. */ |
f49658f5 | 1147 | if (have < 3) { |
28b9cb4d | 1148 | /* need more */ |
1149 | FD_SET(c->sock, readset); | |
1150 | return; | |
1151 | } | |
1152 | /* try to guess the protocol */ | |
1153 | p = buffer_ptr(&c->input); | |
1154 | switch (p[0]) { | |
6683b40f | 1155 | case 0x04: |
1156 | ret = channel_decode_socks4(c, readset, writeset); | |
1157 | break; | |
f49658f5 | 1158 | case 0x05: |
1159 | ret = channel_decode_socks5(c, readset, writeset); | |
1160 | break; | |
28b9cb4d | 1161 | default: |
1162 | ret = -1; | |
1163 | break; | |
1164 | } | |
1165 | if (ret < 0) { | |
719fc62f | 1166 | chan_mark_dead(c); |
28b9cb4d | 1167 | } else if (ret == 0) { |
1168 | debug2("channel %d: pre_dynamic: need more", c->self); | |
1169 | /* need more */ | |
1170 | FD_SET(c->sock, readset); | |
1171 | } else { | |
1172 | /* switch to the next state */ | |
1173 | c->type = SSH_CHANNEL_OPENING; | |
1174 | port_open_helper(c, "direct-tcpip"); | |
1175 | } | |
1176 | } | |
0490e609 | 1177 | |
7368a6c8 | 1178 | /* This is our fake X11 server socket. */ |
ebb90778 | 1179 | /* ARGSUSED */ |
396c147e | 1180 | static void |
c8e9c167 | 1181 | channel_post_x11_listener(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1182 | { |
719fc62f | 1183 | Channel *nc; |
7368a6c8 | 1184 | struct sockaddr addr; |
bcc0381e | 1185 | int newsock; |
7368a6c8 | 1186 | socklen_t addrlen; |
865ac82e | 1187 | char buf[16384], *remote_ipaddr; |
0b242b12 | 1188 | int remote_port; |
7368a6c8 | 1189 | |
1190 | if (FD_ISSET(c->sock, readset)) { | |
1191 | debug("X11 connection requested."); | |
1192 | addrlen = sizeof(addr); | |
1193 | newsock = accept(c->sock, &addr, &addrlen); | |
ac151b18 | 1194 | if (c->single_connection) { |
d7ac5f18 | 1195 | debug2("single_connection: closing X11 listener."); |
ac151b18 | 1196 | channel_close_fd(&c->sock); |
1197 | chan_mark_dead(c); | |
1198 | } | |
7368a6c8 | 1199 | if (newsock < 0) { |
1200 | error("accept: %.100s", strerror(errno)); | |
1201 | return; | |
5260325f | 1202 | } |
bcc0381e | 1203 | set_nodelay(newsock); |
865ac82e | 1204 | remote_ipaddr = get_peer_ipaddr(newsock); |
0b242b12 | 1205 | remote_port = get_peer_port(newsock); |
7368a6c8 | 1206 | snprintf(buf, sizeof buf, "X11 connection from %.200s port %d", |
865ac82e | 1207 | remote_ipaddr, remote_port); |
0b242b12 | 1208 | |
719fc62f | 1209 | nc = channel_new("accepted x11 socket", |
0b242b12 | 1210 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
0d942eff | 1211 | c->local_window_max, c->local_maxpacket, 0, buf, 1); |
0b242b12 | 1212 | if (compat20) { |
1213 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1214 | packet_put_cstring("x11"); | |
719fc62f | 1215 | packet_put_int(nc->self); |
ac151b18 | 1216 | packet_put_int(nc->local_window_max); |
1217 | packet_put_int(nc->local_maxpacket); | |
865ac82e | 1218 | /* originator ipaddr and port */ |
1219 | packet_put_cstring(remote_ipaddr); | |
d0c832f3 | 1220 | if (datafellows & SSH_BUG_X11FWD) { |
d7ac5f18 | 1221 | debug2("ssh2 x11 bug compat mode"); |
d0c832f3 | 1222 | } else { |
1223 | packet_put_int(remote_port); | |
1224 | } | |
0b242b12 | 1225 | packet_send(); |
1226 | } else { | |
1227 | packet_start(SSH_SMSG_X11_OPEN); | |
719fc62f | 1228 | packet_put_int(nc->self); |
8e7895b8 | 1229 | if (packet_get_protocol_flags() & |
1230 | SSH_PROTOFLAG_HOST_IN_FWD_OPEN) | |
449c5ba5 | 1231 | packet_put_cstring(buf); |
0b242b12 | 1232 | packet_send(); |
1233 | } | |
865ac82e | 1234 | xfree(remote_ipaddr); |
8efc0c15 | 1235 | } |
8efc0c15 | 1236 | } |
1237 | ||
396c147e | 1238 | static void |
0490e609 | 1239 | port_open_helper(Channel *c, char *rtype) |
1240 | { | |
1241 | int direct; | |
1242 | char buf[1024]; | |
1243 | char *remote_ipaddr = get_peer_ipaddr(c->sock); | |
29798ed0 | 1244 | int remote_port = get_peer_port(c->sock); |
0490e609 | 1245 | |
1246 | direct = (strcmp(rtype, "direct-tcpip") == 0); | |
1247 | ||
1248 | snprintf(buf, sizeof buf, | |
1249 | "%s: listening port %d for %.100s port %d, " | |
1250 | "connect from %.200s port %d", | |
1251 | rtype, c->listening_port, c->path, c->host_port, | |
1252 | remote_ipaddr, remote_port); | |
1253 | ||
1254 | xfree(c->remote_name); | |
1255 | c->remote_name = xstrdup(buf); | |
1256 | ||
1257 | if (compat20) { | |
1258 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1259 | packet_put_cstring(rtype); | |
1260 | packet_put_int(c->self); | |
1261 | packet_put_int(c->local_window_max); | |
1262 | packet_put_int(c->local_maxpacket); | |
1263 | if (direct) { | |
1264 | /* target host, port */ | |
1265 | packet_put_cstring(c->path); | |
1266 | packet_put_int(c->host_port); | |
1267 | } else { | |
1268 | /* listen address, port */ | |
1269 | packet_put_cstring(c->path); | |
1270 | packet_put_int(c->listening_port); | |
1271 | } | |
1272 | /* originator host and port */ | |
1273 | packet_put_cstring(remote_ipaddr); | |
29798ed0 | 1274 | packet_put_int((u_int)remote_port); |
0490e609 | 1275 | packet_send(); |
1276 | } else { | |
1277 | packet_start(SSH_MSG_PORT_OPEN); | |
1278 | packet_put_int(c->self); | |
1279 | packet_put_cstring(c->path); | |
1280 | packet_put_int(c->host_port); | |
8e7895b8 | 1281 | if (packet_get_protocol_flags() & |
1282 | SSH_PROTOFLAG_HOST_IN_FWD_OPEN) | |
0490e609 | 1283 | packet_put_cstring(c->remote_name); |
1284 | packet_send(); | |
1285 | } | |
1286 | xfree(remote_ipaddr); | |
1287 | } | |
1288 | ||
442aee3a | 1289 | static void |
1290 | channel_set_reuseaddr(int fd) | |
1291 | { | |
1292 | int on = 1; | |
1293 | ||
1294 | /* | |
1295 | * Set socket options. | |
1296 | * Allow local port reuse in TIME_WAIT. | |
1297 | */ | |
1298 | if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1) | |
1299 | error("setsockopt SO_REUSEADDR fd %d: %s", fd, strerror(errno)); | |
1300 | } | |
1301 | ||
aa3378df | 1302 | /* |
7368a6c8 | 1303 | * This socket is listening for connections to a forwarded TCP/IP port. |
aa3378df | 1304 | */ |
ebb90778 | 1305 | /* ARGSUSED */ |
396c147e | 1306 | static void |
c8e9c167 | 1307 | channel_post_port_listener(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1308 | { |
0490e609 | 1309 | Channel *nc; |
7368a6c8 | 1310 | struct sockaddr addr; |
719fc62f | 1311 | int newsock, nextstate; |
7368a6c8 | 1312 | socklen_t addrlen; |
0490e609 | 1313 | char *rtype; |
fa08c86b | 1314 | |
7368a6c8 | 1315 | if (FD_ISSET(c->sock, readset)) { |
1316 | debug("Connection to port %d forwarding " | |
1317 | "to %.100s port %d requested.", | |
1318 | c->listening_port, c->path, c->host_port); | |
0490e609 | 1319 | |
639cb8ab | 1320 | if (c->type == SSH_CHANNEL_RPORT_LISTENER) { |
1321 | nextstate = SSH_CHANNEL_OPENING; | |
1322 | rtype = "forwarded-tcpip"; | |
1323 | } else { | |
1324 | if (c->host_port == 0) { | |
1325 | nextstate = SSH_CHANNEL_DYNAMIC; | |
f3964cb9 | 1326 | rtype = "dynamic-tcpip"; |
639cb8ab | 1327 | } else { |
1328 | nextstate = SSH_CHANNEL_OPENING; | |
1329 | rtype = "direct-tcpip"; | |
1330 | } | |
1331 | } | |
0490e609 | 1332 | |
7368a6c8 | 1333 | addrlen = sizeof(addr); |
1334 | newsock = accept(c->sock, &addr, &addrlen); | |
1335 | if (newsock < 0) { | |
1336 | error("accept: %.100s", strerror(errno)); | |
1337 | return; | |
1338 | } | |
811a6342 | 1339 | set_nodelay(newsock); |
0d942eff | 1340 | nc = channel_new(rtype, nextstate, newsock, newsock, -1, |
1341 | c->local_window_max, c->local_maxpacket, 0, rtype, 1); | |
0490e609 | 1342 | nc->listening_port = c->listening_port; |
1343 | nc->host_port = c->host_port; | |
1344 | strlcpy(nc->path, c->path, sizeof(nc->path)); | |
1345 | ||
639cb8ab | 1346 | if (nextstate == SSH_CHANNEL_DYNAMIC) { |
1347 | /* | |
1348 | * do not call the channel_post handler until | |
1349 | * this flag has been reset by a pre-handler. | |
1350 | * otherwise the FD_ISSET calls might overflow | |
1351 | */ | |
1352 | nc->delayed = 1; | |
1353 | } else { | |
0490e609 | 1354 | port_open_helper(nc, rtype); |
639cb8ab | 1355 | } |
7368a6c8 | 1356 | } |
1357 | } | |
8efc0c15 | 1358 | |
7368a6c8 | 1359 | /* |
1360 | * This is the authentication agent socket listening for connections from | |
1361 | * clients. | |
1362 | */ | |
ebb90778 | 1363 | /* ARGSUSED */ |
396c147e | 1364 | static void |
c8e9c167 | 1365 | channel_post_auth_listener(Channel *c, fd_set *readset, fd_set *writeset) |
8efc0c15 | 1366 | { |
719fc62f | 1367 | Channel *nc; |
1368 | int newsock; | |
5260325f | 1369 | struct sockaddr addr; |
48e671d5 | 1370 | socklen_t addrlen; |
5260325f | 1371 | |
7368a6c8 | 1372 | if (FD_ISSET(c->sock, readset)) { |
1373 | addrlen = sizeof(addr); | |
1374 | newsock = accept(c->sock, &addr, &addrlen); | |
1375 | if (newsock < 0) { | |
1376 | error("accept from auth socket: %.100s", strerror(errno)); | |
1377 | return; | |
1378 | } | |
719fc62f | 1379 | nc = channel_new("accepted auth socket", |
fa08c86b | 1380 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
1381 | c->local_window_max, c->local_maxpacket, | |
0d942eff | 1382 | 0, "accepted auth socket", 1); |
fa08c86b | 1383 | if (compat20) { |
1384 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1385 | packet_put_cstring("auth-agent@openssh.com"); | |
719fc62f | 1386 | packet_put_int(nc->self); |
fa08c86b | 1387 | packet_put_int(c->local_window_max); |
1388 | packet_put_int(c->local_maxpacket); | |
1389 | } else { | |
1390 | packet_start(SSH_SMSG_AGENT_OPEN); | |
719fc62f | 1391 | packet_put_int(nc->self); |
fa08c86b | 1392 | } |
7368a6c8 | 1393 | packet_send(); |
1394 | } | |
1395 | } | |
5260325f | 1396 | |
ebb90778 | 1397 | /* ARGSUSED */ |
396c147e | 1398 | static void |
c8e9c167 | 1399 | channel_post_connecting(Channel *c, fd_set *readset, fd_set *writeset) |
97fb6912 | 1400 | { |
d18e0850 | 1401 | int err = 0; |
8ab2cb35 | 1402 | socklen_t sz = sizeof(err); |
d18e0850 | 1403 | |
97fb6912 | 1404 | if (FD_ISSET(c->sock, writeset)) { |
db518d9b | 1405 | if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, &err, &sz) < 0) { |
d18e0850 | 1406 | err = errno; |
1407 | error("getsockopt SO_ERROR failed"); | |
1408 | } | |
1409 | if (err == 0) { | |
1410 | debug("channel %d: connected", c->self); | |
1411 | c->type = SSH_CHANNEL_OPEN; | |
1412 | if (compat20) { | |
1413 | packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1414 | packet_put_int(c->remote_id); | |
1415 | packet_put_int(c->self); | |
1416 | packet_put_int(c->local_window); | |
1417 | packet_put_int(c->local_maxpacket); | |
1418 | } else { | |
1419 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1420 | packet_put_int(c->remote_id); | |
1421 | packet_put_int(c->self); | |
1422 | } | |
97fb6912 | 1423 | } else { |
d18e0850 | 1424 | debug("channel %d: not connected: %s", |
1425 | c->self, strerror(err)); | |
1426 | if (compat20) { | |
1427 | packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); | |
1428 | packet_put_int(c->remote_id); | |
1429 | packet_put_int(SSH2_OPEN_CONNECT_FAILED); | |
1430 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { | |
1431 | packet_put_cstring(strerror(err)); | |
1432 | packet_put_cstring(""); | |
1433 | } | |
97fb6912 | 1434 | } else { |
d18e0850 | 1435 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
1436 | packet_put_int(c->remote_id); | |
97fb6912 | 1437 | } |
d18e0850 | 1438 | chan_mark_dead(c); |
97fb6912 | 1439 | } |
d18e0850 | 1440 | packet_send(); |
97fb6912 | 1441 | } |
1442 | } | |
1443 | ||
ebb90778 | 1444 | /* ARGSUSED */ |
396c147e | 1445 | static int |
c8e9c167 | 1446 | channel_handle_rfd(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1447 | { |
fa1d7d85 | 1448 | char buf[CHAN_RBUF]; |
bd6a1355 | 1449 | int len, force; |
7368a6c8 | 1450 | |
bd6a1355 | 1451 | force = c->isatty && c->detach_close && c->istate != CHAN_INPUT_CLOSED; |
1452 | if (c->rfd != -1 && (force || FD_ISSET(c->rfd, readset))) { | |
ea8c44d9 | 1453 | errno = 0; |
7368a6c8 | 1454 | len = read(c->rfd, buf, sizeof(buf)); |
bd6a1355 | 1455 | if (len < 0 && (errno == EINTR || (errno == EAGAIN && !force))) |
0fbe8c74 | 1456 | return 1; |
ea8c44d9 | 1457 | #ifndef PTY_ZEROREAD |
7368a6c8 | 1458 | if (len <= 0) { |
ea8c44d9 | 1459 | #else |
9c04d67d | 1460 | if ((!c->isatty && len <= 0) || |
1461 | (c->isatty && (len < 0 || (len == 0 && errno != 0)))) { | |
ea8c44d9 | 1462 | #endif |
d7ac5f18 | 1463 | debug2("channel %d: read<=0 rfd %d len %d", |
7368a6c8 | 1464 | c->self, c->rfd, len); |
28b9cb4d | 1465 | if (c->type != SSH_CHANNEL_OPEN) { |
d7ac5f18 | 1466 | debug2("channel %d: not open", c->self); |
719fc62f | 1467 | chan_mark_dead(c); |
0490e609 | 1468 | return -1; |
28b9cb4d | 1469 | } else if (compat13) { |
9c50edcf | 1470 | buffer_clear(&c->output); |
7368a6c8 | 1471 | c->type = SSH_CHANNEL_INPUT_DRAINING; |
d7ac5f18 | 1472 | debug2("channel %d: input draining.", c->self); |
7368a6c8 | 1473 | } else { |
1474 | chan_read_failed(c); | |
5260325f | 1475 | } |
7368a6c8 | 1476 | return -1; |
1477 | } | |
6aacefa7 | 1478 | if (c->input_filter != NULL) { |
2e73a022 | 1479 | if (c->input_filter(c, buf, len) == -1) { |
d7ac5f18 | 1480 | debug2("channel %d: filter stops", c->self); |
2e73a022 | 1481 | chan_read_failed(c); |
1482 | } | |
d20f3c9e | 1483 | } else if (c->datagram) { |
1484 | buffer_put_string(&c->input, buf, len); | |
2e73a022 | 1485 | } else { |
1486 | buffer_append(&c->input, buf, len); | |
1487 | } | |
7368a6c8 | 1488 | } |
1489 | return 1; | |
1490 | } | |
a7137f6b | 1491 | |
ebb90778 | 1492 | /* ARGSUSED */ |
396c147e | 1493 | static int |
c8e9c167 | 1494 | channel_handle_wfd(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1495 | { |
95ce5599 | 1496 | struct termios tio; |
c1c6a032 | 1497 | u_char *data = NULL, *buf; |
780a9951 | 1498 | u_int dlen; |
7368a6c8 | 1499 | int len; |
1500 | ||
1501 | /* Send buffered output data to the socket. */ | |
6fd8622b | 1502 | if (c->wfd != -1 && |
7368a6c8 | 1503 | FD_ISSET(c->wfd, writeset) && |
1504 | buffer_len(&c->output) > 0) { | |
c1c6a032 | 1505 | if (c->output_filter != NULL) { |
1506 | if ((buf = c->output_filter(c, &data, &dlen)) == NULL) { | |
1507 | debug2("channel %d: filter stops", c->self); | |
d7b37427 | 1508 | if (c->type != SSH_CHANNEL_OPEN) |
1509 | chan_mark_dead(c); | |
1510 | else | |
1511 | chan_write_failed(c); | |
1512 | return -1; | |
c1c6a032 | 1513 | } |
1514 | } else if (c->datagram) { | |
1515 | buf = data = buffer_get_string(&c->output, &dlen); | |
1516 | } else { | |
1517 | buf = data = buffer_ptr(&c->output); | |
1518 | dlen = buffer_len(&c->output); | |
1519 | } | |
1520 | ||
d20f3c9e | 1521 | if (c->datagram) { |
d20f3c9e | 1522 | /* ignore truncated writes, datagrams might get lost */ |
1523 | c->local_consumed += dlen + 4; | |
c1c6a032 | 1524 | len = write(c->wfd, buf, dlen); |
d20f3c9e | 1525 | xfree(data); |
1526 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) | |
1527 | return 1; | |
1528 | if (len <= 0) { | |
1529 | if (c->type != SSH_CHANNEL_OPEN) | |
1530 | chan_mark_dead(c); | |
1531 | else | |
1532 | chan_write_failed(c); | |
1533 | return -1; | |
1534 | } | |
1535 | return 1; | |
1536 | } | |
64c0ce80 | 1537 | #ifdef _AIX |
aff51935 | 1538 | /* XXX: Later AIX versions can't push as much data to tty */ |
7fbb4189 | 1539 | if (compat20 && c->wfd_isatty) |
1540 | dlen = MIN(dlen, 8*1024); | |
64c0ce80 | 1541 | #endif |
c1c6a032 | 1542 | |
1543 | len = write(c->wfd, buf, dlen); | |
0fbe8c74 | 1544 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
1545 | return 1; | |
7368a6c8 | 1546 | if (len <= 0) { |
28b9cb4d | 1547 | if (c->type != SSH_CHANNEL_OPEN) { |
d7ac5f18 | 1548 | debug2("channel %d: not open", c->self); |
719fc62f | 1549 | chan_mark_dead(c); |
28b9cb4d | 1550 | return -1; |
1551 | } else if (compat13) { | |
9c50edcf | 1552 | buffer_clear(&c->output); |
d7ac5f18 | 1553 | debug2("channel %d: input draining.", c->self); |
7368a6c8 | 1554 | c->type = SSH_CHANNEL_INPUT_DRAINING; |
1555 | } else { | |
1556 | chan_write_failed(c); | |
5260325f | 1557 | } |
7368a6c8 | 1558 | return -1; |
1559 | } | |
c1c6a032 | 1560 | if (compat20 && c->isatty && dlen >= 1 && buf[0] != '\r') { |
0ae4fe1d | 1561 | if (tcgetattr(c->wfd, &tio) == 0 && |
1562 | !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) { | |
1563 | /* | |
1564 | * Simulate echo to reduce the impact of | |
355724fc | 1565 | * traffic analysis. We need to match the |
95ce5599 | 1566 | * size of a SSH2_MSG_CHANNEL_DATA message |
c1c6a032 | 1567 | * (4 byte channel id + buf) |
0ae4fe1d | 1568 | */ |
95ce5599 | 1569 | packet_send_ignore(4 + len); |
0ae4fe1d | 1570 | packet_send(); |
0ae4fe1d | 1571 | } |
1572 | } | |
7368a6c8 | 1573 | buffer_consume(&c->output, len); |
7e7327a1 | 1574 | if (compat20 && len > 0) { |
1575 | c->local_consumed += len; | |
1576 | } | |
1577 | } | |
1578 | return 1; | |
1579 | } | |
a7137f6b | 1580 | |
396c147e | 1581 | static int |
c8e9c167 | 1582 | channel_handle_efd(Channel *c, fd_set *readset, fd_set *writeset) |
7e7327a1 | 1583 | { |
fa1d7d85 | 1584 | char buf[CHAN_RBUF]; |
7e7327a1 | 1585 | int len; |
1586 | ||
8ce64345 | 1587 | /** XXX handle drain efd, too */ |
7e7327a1 | 1588 | if (c->efd != -1) { |
1589 | if (c->extended_usage == CHAN_EXTENDED_WRITE && | |
1590 | FD_ISSET(c->efd, writeset) && | |
1591 | buffer_len(&c->extended) > 0) { | |
1592 | len = write(c->efd, buffer_ptr(&c->extended), | |
1593 | buffer_len(&c->extended)); | |
de273eef | 1594 | debug2("channel %d: written %d to efd %d", |
7e7327a1 | 1595 | c->self, len, c->efd); |
ee55dacf | 1596 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
1597 | return 1; | |
1598 | if (len <= 0) { | |
1599 | debug2("channel %d: closing write-efd %d", | |
1600 | c->self, c->efd); | |
489aa2e9 | 1601 | channel_close_fd(&c->efd); |
ee55dacf | 1602 | } else { |
7e7327a1 | 1603 | buffer_consume(&c->extended, len); |
1604 | c->local_consumed += len; | |
1605 | } | |
1606 | } else if (c->extended_usage == CHAN_EXTENDED_READ && | |
34640ce6 | 1607 | (c->detach_close || FD_ISSET(c->efd, readset))) { |
7e7327a1 | 1608 | len = read(c->efd, buf, sizeof(buf)); |
de273eef | 1609 | debug2("channel %d: read %d from efd %d", |
184eed6a | 1610 | c->self, len, c->efd); |
34640ce6 | 1611 | if (len < 0 && (errno == EINTR || |
1612 | (errno == EAGAIN && !c->detach_close))) | |
ee55dacf | 1613 | return 1; |
1614 | if (len <= 0) { | |
1615 | debug2("channel %d: closing read-efd %d", | |
8ce64345 | 1616 | c->self, c->efd); |
489aa2e9 | 1617 | channel_close_fd(&c->efd); |
ee55dacf | 1618 | } else { |
7e7327a1 | 1619 | buffer_append(&c->extended, buf, len); |
ee55dacf | 1620 | } |
7e7327a1 | 1621 | } |
1622 | } | |
1623 | return 1; | |
1624 | } | |
a7137f6b | 1625 | |
ebb90778 | 1626 | /* ARGSUSED */ |
396c147e | 1627 | static int |
c8e9c167 | 1628 | channel_handle_ctl(Channel *c, fd_set *readset, fd_set *writeset) |
5e96b616 | 1629 | { |
1630 | char buf[16]; | |
1631 | int len; | |
1632 | ||
1633 | /* Monitor control fd to detect if the slave client exits */ | |
1634 | if (c->ctl_fd != -1 && FD_ISSET(c->ctl_fd, readset)) { | |
1635 | len = read(c->ctl_fd, buf, sizeof(buf)); | |
1636 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) | |
1637 | return 1; | |
1638 | if (len <= 0) { | |
1639 | debug2("channel %d: ctl read<=0", c->self); | |
1640 | if (c->type != SSH_CHANNEL_OPEN) { | |
1641 | debug2("channel %d: not open", c->self); | |
1642 | chan_mark_dead(c); | |
1643 | return -1; | |
1644 | } else { | |
1645 | chan_read_failed(c); | |
1646 | chan_write_failed(c); | |
1647 | } | |
1648 | return -1; | |
1649 | } else | |
1650 | fatal("%s: unexpected data on ctl fd", __func__); | |
1651 | } | |
1652 | return 1; | |
1653 | } | |
a7137f6b | 1654 | |
5e96b616 | 1655 | static int |
ee55dacf | 1656 | channel_check_window(Channel *c) |
7e7327a1 | 1657 | { |
28b9cb4d | 1658 | if (c->type == SSH_CHANNEL_OPEN && |
1659 | !(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) && | |
d9245683 | 1660 | ((c->local_window_max - c->local_window > |
68a73f53 | 1661 | c->local_maxpacket*3) || |
1662 | c->local_window < c->local_window_max/2) && | |
7e7327a1 | 1663 | c->local_consumed > 0) { |
1664 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); | |
1665 | packet_put_int(c->remote_id); | |
1666 | packet_put_int(c->local_consumed); | |
1667 | packet_send(); | |
de273eef | 1668 | debug2("channel %d: window %d sent adjust %d", |
7e7327a1 | 1669 | c->self, c->local_window, |
1670 | c->local_consumed); | |
1671 | c->local_window += c->local_consumed; | |
1672 | c->local_consumed = 0; | |
7368a6c8 | 1673 | } |
1674 | return 1; | |
1675 | } | |
5260325f | 1676 | |
396c147e | 1677 | static void |
c8e9c167 | 1678 | channel_post_open(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1679 | { |
639cb8ab | 1680 | if (c->delayed) |
1681 | return; | |
7368a6c8 | 1682 | channel_handle_rfd(c, readset, writeset); |
1683 | channel_handle_wfd(c, readset, writeset); | |
0c0738d5 | 1684 | if (!compat20) |
639cb8ab | 1685 | return; |
7e7327a1 | 1686 | channel_handle_efd(c, readset, writeset); |
5e96b616 | 1687 | channel_handle_ctl(c, readset, writeset); |
ee55dacf | 1688 | channel_check_window(c); |
7e7327a1 | 1689 | } |
1690 | ||
ebb90778 | 1691 | /* ARGSUSED */ |
396c147e | 1692 | static void |
c8e9c167 | 1693 | channel_post_output_drain_13(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1694 | { |
1695 | int len; | |
e1feb9bf | 1696 | |
7368a6c8 | 1697 | /* Send buffered output data to the socket. */ |
1698 | if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) { | |
1699 | len = write(c->sock, buffer_ptr(&c->output), | |
1700 | buffer_len(&c->output)); | |
1701 | if (len <= 0) | |
9c50edcf | 1702 | buffer_clear(&c->output); |
7368a6c8 | 1703 | else |
1704 | buffer_consume(&c->output, len); | |
1705 | } | |
1706 | } | |
5260325f | 1707 | |
396c147e | 1708 | static void |
7e7327a1 | 1709 | channel_handler_init_20(void) |
1710 | { | |
0c0738d5 | 1711 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open; |
0b242b12 | 1712 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
7e7327a1 | 1713 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; |
fa08c86b | 1714 | channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener; |
0b242b12 | 1715 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
fa08c86b | 1716 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; |
97fb6912 | 1717 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1718 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7e7327a1 | 1719 | |
0c0738d5 | 1720 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
7e7327a1 | 1721 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; |
fa08c86b | 1722 | channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener; |
0b242b12 | 1723 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
fa08c86b | 1724 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; |
97fb6912 | 1725 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 1726 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
7e7327a1 | 1727 | } |
1728 | ||
396c147e | 1729 | static void |
7368a6c8 | 1730 | channel_handler_init_13(void) |
1731 | { | |
1732 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13; | |
1733 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_13; | |
1734 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; | |
1735 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; | |
1736 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; | |
1737 | channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining; | |
1738 | channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining; | |
97fb6912 | 1739 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1740 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7368a6c8 | 1741 | |
0c0738d5 | 1742 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
7368a6c8 | 1743 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
1744 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; | |
1745 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; | |
1746 | channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13; | |
97fb6912 | 1747 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 1748 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
7368a6c8 | 1749 | } |
5260325f | 1750 | |
396c147e | 1751 | static void |
7368a6c8 | 1752 | channel_handler_init_15(void) |
1753 | { | |
0c0738d5 | 1754 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open; |
0b242b12 | 1755 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
7368a6c8 | 1756 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
1757 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; | |
1758 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; | |
97fb6912 | 1759 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1760 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7368a6c8 | 1761 | |
1762 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; | |
1763 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; | |
1764 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; | |
0c0738d5 | 1765 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
97fb6912 | 1766 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 1767 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
7368a6c8 | 1768 | } |
1769 | ||
396c147e | 1770 | static void |
7368a6c8 | 1771 | channel_handler_init(void) |
1772 | { | |
1773 | int i; | |
e1feb9bf | 1774 | |
184eed6a | 1775 | for (i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) { |
7368a6c8 | 1776 | channel_pre[i] = NULL; |
1777 | channel_post[i] = NULL; | |
1778 | } | |
7e7327a1 | 1779 | if (compat20) |
1780 | channel_handler_init_20(); | |
1781 | else if (compat13) | |
7368a6c8 | 1782 | channel_handler_init_13(); |
1783 | else | |
1784 | channel_handler_init_15(); | |
1785 | } | |
1786 | ||
418e724c | 1787 | /* gc dead channels */ |
1788 | static void | |
1789 | channel_garbage_collect(Channel *c) | |
1790 | { | |
1791 | if (c == NULL) | |
1792 | return; | |
1793 | if (c->detach_user != NULL) { | |
8cd0437d | 1794 | if (!chan_is_dead(c, c->detach_close)) |
418e724c | 1795 | return; |
d7ac5f18 | 1796 | debug2("channel %d: gc: notify user", c->self); |
418e724c | 1797 | c->detach_user(c->self, NULL); |
1798 | /* if we still have a callback */ | |
1799 | if (c->detach_user != NULL) | |
1800 | return; | |
d7ac5f18 | 1801 | debug2("channel %d: gc: user detached", c->self); |
418e724c | 1802 | } |
1803 | if (!chan_is_dead(c, 1)) | |
1804 | return; | |
d7ac5f18 | 1805 | debug2("channel %d: garbage collecting", c->self); |
418e724c | 1806 | channel_free(c); |
1807 | } | |
1808 | ||
396c147e | 1809 | static void |
c8e9c167 | 1810 | channel_handler(chan_fn *ftab[], fd_set *readset, fd_set *writeset) |
7368a6c8 | 1811 | { |
1812 | static int did_init = 0; | |
9a995072 | 1813 | u_int i; |
7368a6c8 | 1814 | Channel *c; |
1815 | ||
1816 | if (!did_init) { | |
1817 | channel_handler_init(); | |
1818 | did_init = 1; | |
1819 | } | |
1820 | for (i = 0; i < channels_alloc; i++) { | |
719fc62f | 1821 | c = channels[i]; |
1822 | if (c == NULL) | |
5260325f | 1823 | continue; |
6fd8622b | 1824 | if (ftab[c->type] != NULL) |
1825 | (*ftab[c->type])(c, readset, writeset); | |
418e724c | 1826 | channel_garbage_collect(c); |
8efc0c15 | 1827 | } |
8efc0c15 | 1828 | } |
1829 | ||
8e7895b8 | 1830 | /* |
1831 | * Allocate/update select bitmasks and add any bits relevant to channels in | |
1832 | * select bitmasks. | |
1833 | */ | |
6ae2364d | 1834 | void |
c422989b | 1835 | channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp, |
9a995072 | 1836 | u_int *nallocp, int rekeying) |
7368a6c8 | 1837 | { |
c5d10563 | 1838 | u_int n, sz, nfdset; |
39929cdb | 1839 | |
1840 | n = MAX(*maxfdp, channel_max_fd); | |
1841 | ||
c5d10563 | 1842 | nfdset = howmany(n+1, NFDBITS); |
1843 | /* Explicitly test here, because xrealloc isn't always called */ | |
1844 | if (nfdset && SIZE_T_MAX / nfdset < sizeof(fd_mask)) | |
1845 | fatal("channel_prepare_select: max_fd (%d) is too large", n); | |
1846 | sz = nfdset * sizeof(fd_mask); | |
1847 | ||
489aa2e9 | 1848 | /* perhaps check sz < nalloc/2 and shrink? */ |
1849 | if (*readsetp == NULL || sz > *nallocp) { | |
c5d10563 | 1850 | *readsetp = xrealloc(*readsetp, nfdset, sizeof(fd_mask)); |
1851 | *writesetp = xrealloc(*writesetp, nfdset, sizeof(fd_mask)); | |
489aa2e9 | 1852 | *nallocp = sz; |
39929cdb | 1853 | } |
489aa2e9 | 1854 | *maxfdp = n; |
39929cdb | 1855 | memset(*readsetp, 0, sz); |
1856 | memset(*writesetp, 0, sz); | |
1857 | ||
c422989b | 1858 | if (!rekeying) |
1859 | channel_handler(channel_pre, *readsetp, *writesetp); | |
7368a6c8 | 1860 | } |
1861 | ||
8e7895b8 | 1862 | /* |
1863 | * After select, perform any appropriate operations for channels which have | |
1864 | * events pending. | |
1865 | */ | |
6ae2364d | 1866 | void |
c8e9c167 | 1867 | channel_after_select(fd_set *readset, fd_set *writeset) |
7368a6c8 | 1868 | { |
1869 | channel_handler(channel_post, readset, writeset); | |
1870 | } | |
1871 | ||
8e7895b8 | 1872 | |
39929cdb | 1873 | /* If there is data to send to the connection, enqueue some of it now. */ |
6ae2364d | 1874 | void |
d5bb9418 | 1875 | channel_output_poll(void) |
8efc0c15 | 1876 | { |
7368a6c8 | 1877 | Channel *c; |
9a995072 | 1878 | u_int i, len; |
5260325f | 1879 | |
1880 | for (i = 0; i < channels_alloc; i++) { | |
719fc62f | 1881 | c = channels[i]; |
1882 | if (c == NULL) | |
1883 | continue; | |
48e671d5 | 1884 | |
8e7895b8 | 1885 | /* |
1886 | * We are only interested in channels that can have buffered | |
1887 | * incoming data. | |
1888 | */ | |
48e671d5 | 1889 | if (compat13) { |
7368a6c8 | 1890 | if (c->type != SSH_CHANNEL_OPEN && |
1891 | c->type != SSH_CHANNEL_INPUT_DRAINING) | |
48e671d5 | 1892 | continue; |
1893 | } else { | |
7368a6c8 | 1894 | if (c->type != SSH_CHANNEL_OPEN) |
48e671d5 | 1895 | continue; |
48e671d5 | 1896 | } |
e78a59f5 | 1897 | if (compat20 && |
1898 | (c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) { | |
ee55dacf | 1899 | /* XXX is this true? */ |
418e724c | 1900 | debug3("channel %d: will not send data after close", c->self); |
7e7327a1 | 1901 | continue; |
1902 | } | |
5260325f | 1903 | |
1904 | /* Get the amount of buffered data for this channel. */ | |
ee55dacf | 1905 | if ((c->istate == CHAN_INPUT_OPEN || |
1906 | c->istate == CHAN_INPUT_WAIT_DRAIN) && | |
1907 | (len = buffer_len(&c->input)) > 0) { | |
d20f3c9e | 1908 | if (c->datagram) { |
1909 | if (len > 0) { | |
1910 | u_char *data; | |
1911 | u_int dlen; | |
1912 | ||
1913 | data = buffer_get_string(&c->input, | |
1914 | &dlen); | |
1915 | packet_start(SSH2_MSG_CHANNEL_DATA); | |
1916 | packet_put_int(c->remote_id); | |
1917 | packet_put_string(data, dlen); | |
1918 | packet_send(); | |
1919 | c->remote_window -= dlen + 4; | |
1920 | xfree(data); | |
1921 | } | |
1922 | continue; | |
1923 | } | |
8e7895b8 | 1924 | /* |
1925 | * Send some data for the other side over the secure | |
1926 | * connection. | |
1927 | */ | |
7e7327a1 | 1928 | if (compat20) { |
1929 | if (len > c->remote_window) | |
1930 | len = c->remote_window; | |
1931 | if (len > c->remote_maxpacket) | |
1932 | len = c->remote_maxpacket; | |
5260325f | 1933 | } else { |
7e7327a1 | 1934 | if (packet_is_interactive()) { |
1935 | if (len > 1024) | |
1936 | len = 512; | |
1937 | } else { | |
1938 | /* Keep the packets at reasonable size. */ | |
1939 | if (len > packet_get_maxsize()/2) | |
1940 | len = packet_get_maxsize()/2; | |
1941 | } | |
5260325f | 1942 | } |
7368a6c8 | 1943 | if (len > 0) { |
7e7327a1 | 1944 | packet_start(compat20 ? |
1945 | SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA); | |
7368a6c8 | 1946 | packet_put_int(c->remote_id); |
1947 | packet_put_string(buffer_ptr(&c->input), len); | |
1948 | packet_send(); | |
1949 | buffer_consume(&c->input, len); | |
1950 | c->remote_window -= len; | |
7368a6c8 | 1951 | } |
1952 | } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) { | |
5260325f | 1953 | if (compat13) |
1954 | fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3"); | |
aa3378df | 1955 | /* |
1956 | * input-buffer is empty and read-socket shutdown: | |
d2296ed7 | 1957 | * tell peer, that we will not send more data: send IEOF. |
1958 | * hack for extended data: delay EOF if EFD still in use. | |
aa3378df | 1959 | */ |
d2296ed7 | 1960 | if (CHANNEL_EFD_INPUT_ACTIVE(c)) |
4e2e5cfd | 1961 | debug2("channel %d: ibuf_empty delayed efd %d/(%d)", |
1962 | c->self, c->efd, buffer_len(&c->extended)); | |
d2296ed7 | 1963 | else |
1964 | chan_ibuf_empty(c); | |
5260325f | 1965 | } |
7e7327a1 | 1966 | /* Send extended data, i.e. stderr */ |
1967 | if (compat20 && | |
d2296ed7 | 1968 | !(c->flags & CHAN_EOF_SENT) && |
7e7327a1 | 1969 | c->remote_window > 0 && |
1970 | (len = buffer_len(&c->extended)) > 0 && | |
1971 | c->extended_usage == CHAN_EXTENDED_READ) { | |
f91d9a89 | 1972 | debug2("channel %d: rwin %u elen %u euse %d", |
ee55dacf | 1973 | c->self, c->remote_window, buffer_len(&c->extended), |
1974 | c->extended_usage); | |
7e7327a1 | 1975 | if (len > c->remote_window) |
1976 | len = c->remote_window; | |
1977 | if (len > c->remote_maxpacket) | |
1978 | len = c->remote_maxpacket; | |
1979 | packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA); | |
1980 | packet_put_int(c->remote_id); | |
1981 | packet_put_int(SSH2_EXTENDED_DATA_STDERR); | |
1982 | packet_put_string(buffer_ptr(&c->extended), len); | |
1983 | packet_send(); | |
1984 | buffer_consume(&c->extended, len); | |
1985 | c->remote_window -= len; | |
ee55dacf | 1986 | debug2("channel %d: sent ext data %d", c->self, len); |
7e7327a1 | 1987 | } |
8efc0c15 | 1988 | } |
8efc0c15 | 1989 | } |
1990 | ||
8e7895b8 | 1991 | |
1992 | /* -- protocol input */ | |
04aa9e67 | 1993 | |
1994 | /* ARGSUSED */ | |
6ae2364d | 1995 | void |
7819b5c3 | 1996 | channel_input_data(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 1997 | { |
48e671d5 | 1998 | int id; |
5260325f | 1999 | char *data; |
1e3b8b07 | 2000 | u_int data_len; |
7368a6c8 | 2001 | Channel *c; |
5260325f | 2002 | |
2003 | /* Get the channel number and verify it. */ | |
48e671d5 | 2004 | id = packet_get_int(); |
7368a6c8 | 2005 | c = channel_lookup(id); |
2006 | if (c == NULL) | |
48e671d5 | 2007 | packet_disconnect("Received data for nonexistent channel %d.", id); |
5260325f | 2008 | |
2009 | /* Ignore any data for non-open channels (might happen on close) */ | |
7368a6c8 | 2010 | if (c->type != SSH_CHANNEL_OPEN && |
2011 | c->type != SSH_CHANNEL_X11_OPEN) | |
48e671d5 | 2012 | return; |
2013 | ||
5260325f | 2014 | /* Get the data. */ |
2015 | data = packet_get_string(&data_len); | |
7368a6c8 | 2016 | |
7741e239 | 2017 | /* |
2018 | * Ignore data for protocol > 1.3 if output end is no longer open. | |
2019 | * For protocol 2 the sending side is reducing its window as it sends | |
2020 | * data, so we must 'fake' consumption of the data in order to ensure | |
2021 | * that window updates are sent back. Otherwise the connection might | |
2022 | * deadlock. | |
2023 | */ | |
2024 | if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN) { | |
2025 | if (compat20) { | |
2026 | c->local_window -= data_len; | |
2027 | c->local_consumed += data_len; | |
2028 | } | |
2029 | xfree(data); | |
2030 | return; | |
2031 | } | |
2032 | ||
6aacefa7 | 2033 | if (compat20) { |
7e7327a1 | 2034 | if (data_len > c->local_maxpacket) { |
bbe88b6d | 2035 | logit("channel %d: rcvd big packet %d, maxpack %d", |
7e7327a1 | 2036 | c->self, data_len, c->local_maxpacket); |
2037 | } | |
2038 | if (data_len > c->local_window) { | |
bbe88b6d | 2039 | logit("channel %d: rcvd too much data %d, win %d", |
7e7327a1 | 2040 | c->self, data_len, c->local_window); |
2041 | xfree(data); | |
2042 | return; | |
2043 | } | |
2044 | c->local_window -= data_len; | |
7e7327a1 | 2045 | } |
95500969 | 2046 | packet_check_eom(); |
d20f3c9e | 2047 | if (c->datagram) |
2048 | buffer_put_string(&c->output, data, data_len); | |
2049 | else | |
2050 | buffer_append(&c->output, data, data_len); | |
5260325f | 2051 | xfree(data); |
8efc0c15 | 2052 | } |
8e7895b8 | 2053 | |
04aa9e67 | 2054 | /* ARGSUSED */ |
6ae2364d | 2055 | void |
7819b5c3 | 2056 | channel_input_extended_data(int type, u_int32_t seq, void *ctxt) |
7e7327a1 | 2057 | { |
2058 | int id; | |
7e7327a1 | 2059 | char *data; |
a594fa74 | 2060 | u_int data_len, tcode; |
7e7327a1 | 2061 | Channel *c; |
2062 | ||
2063 | /* Get the channel number and verify it. */ | |
2064 | id = packet_get_int(); | |
2065 | c = channel_lookup(id); | |
2066 | ||
2067 | if (c == NULL) | |
2068 | packet_disconnect("Received extended_data for bad channel %d.", id); | |
2069 | if (c->type != SSH_CHANNEL_OPEN) { | |
bbe88b6d | 2070 | logit("channel %d: ext data for non open", id); |
7e7327a1 | 2071 | return; |
2072 | } | |
d2296ed7 | 2073 | if (c->flags & CHAN_EOF_RCVD) { |
2074 | if (datafellows & SSH_BUG_EXTEOF) | |
2075 | debug("channel %d: accepting ext data after eof", id); | |
2076 | else | |
2077 | packet_disconnect("Received extended_data after EOF " | |
2078 | "on channel %d.", id); | |
2079 | } | |
7e7327a1 | 2080 | tcode = packet_get_int(); |
2081 | if (c->efd == -1 || | |
2082 | c->extended_usage != CHAN_EXTENDED_WRITE || | |
2083 | tcode != SSH2_EXTENDED_DATA_STDERR) { | |
bbe88b6d | 2084 | logit("channel %d: bad ext data", c->self); |
7e7327a1 | 2085 | return; |
2086 | } | |
2087 | data = packet_get_string(&data_len); | |
95500969 | 2088 | packet_check_eom(); |
7e7327a1 | 2089 | if (data_len > c->local_window) { |
bbe88b6d | 2090 | logit("channel %d: rcvd too much extended_data %d, win %d", |
7e7327a1 | 2091 | c->self, data_len, c->local_window); |
2092 | xfree(data); | |
2093 | return; | |
2094 | } | |
de273eef | 2095 | debug2("channel %d: rcvd ext data %d", c->self, data_len); |
7e7327a1 | 2096 | c->local_window -= data_len; |
2097 | buffer_append(&c->extended, data, data_len); | |
2098 | xfree(data); | |
2099 | } | |
2100 | ||
04aa9e67 | 2101 | /* ARGSUSED */ |
6ae2364d | 2102 | void |
7819b5c3 | 2103 | channel_input_ieof(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 2104 | { |
2105 | int id; | |
2106 | Channel *c; | |
2107 | ||
7368a6c8 | 2108 | id = packet_get_int(); |
95500969 | 2109 | packet_check_eom(); |
7368a6c8 | 2110 | c = channel_lookup(id); |
2111 | if (c == NULL) | |
2112 | packet_disconnect("Received ieof for nonexistent channel %d.", id); | |
2113 | chan_rcvd_ieof(c); | |
a5f82435 | 2114 | |
2115 | /* XXX force input close */ | |
8341f420 | 2116 | if (c->force_drain && c->istate == CHAN_INPUT_OPEN) { |
a5f82435 | 2117 | debug("channel %d: FORCE input drain", c->self); |
2118 | c->istate = CHAN_INPUT_WAIT_DRAIN; | |
32e7d71f | 2119 | if (buffer_len(&c->input) == 0) |
2120 | chan_ibuf_empty(c); | |
a5f82435 | 2121 | } |
2122 | ||
7368a6c8 | 2123 | } |
8efc0c15 | 2124 | |
04aa9e67 | 2125 | /* ARGSUSED */ |
6ae2364d | 2126 | void |
7819b5c3 | 2127 | channel_input_close(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2128 | { |
7368a6c8 | 2129 | int id; |
2130 | Channel *c; | |
5260325f | 2131 | |
7368a6c8 | 2132 | id = packet_get_int(); |
95500969 | 2133 | packet_check_eom(); |
7368a6c8 | 2134 | c = channel_lookup(id); |
2135 | if (c == NULL) | |
2136 | packet_disconnect("Received close for nonexistent channel %d.", id); | |
aa3378df | 2137 | |
2138 | /* | |
2139 | * Send a confirmation that we have closed the channel and no more | |
2140 | * data is coming for it. | |
2141 | */ | |
5260325f | 2142 | packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION); |
7368a6c8 | 2143 | packet_put_int(c->remote_id); |
5260325f | 2144 | packet_send(); |
2145 | ||
aa3378df | 2146 | /* |
2147 | * If the channel is in closed state, we have sent a close request, | |
2148 | * and the other side will eventually respond with a confirmation. | |
2149 | * Thus, we cannot free the channel here, because then there would be | |
2150 | * no-one to receive the confirmation. The channel gets freed when | |
2151 | * the confirmation arrives. | |
2152 | */ | |
7368a6c8 | 2153 | if (c->type != SSH_CHANNEL_CLOSED) { |
aa3378df | 2154 | /* |
2155 | * Not a closed channel - mark it as draining, which will | |
2156 | * cause it to be freed later. | |
2157 | */ | |
9c50edcf | 2158 | buffer_clear(&c->input); |
7368a6c8 | 2159 | c->type = SSH_CHANNEL_OUTPUT_DRAINING; |
5260325f | 2160 | } |
8efc0c15 | 2161 | } |
2162 | ||
7368a6c8 | 2163 | /* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */ |
04aa9e67 | 2164 | /* ARGSUSED */ |
6ae2364d | 2165 | void |
7819b5c3 | 2166 | channel_input_oclose(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2167 | { |
7368a6c8 | 2168 | int id = packet_get_int(); |
2169 | Channel *c = channel_lookup(id); | |
a8a21a53 | 2170 | |
95500969 | 2171 | packet_check_eom(); |
7368a6c8 | 2172 | if (c == NULL) |
2173 | packet_disconnect("Received oclose for nonexistent channel %d.", id); | |
2174 | chan_rcvd_oclose(c); | |
8efc0c15 | 2175 | } |
2176 | ||
04aa9e67 | 2177 | /* ARGSUSED */ |
6ae2364d | 2178 | void |
7819b5c3 | 2179 | channel_input_close_confirmation(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 2180 | { |
2181 | int id = packet_get_int(); | |
2182 | Channel *c = channel_lookup(id); | |
2183 | ||
95500969 | 2184 | packet_check_eom(); |
7368a6c8 | 2185 | if (c == NULL) |
2186 | packet_disconnect("Received close confirmation for " | |
2187 | "out-of-range channel %d.", id); | |
2188 | if (c->type != SSH_CHANNEL_CLOSED) | |
2189 | packet_disconnect("Received close confirmation for " | |
2190 | "non-closed channel %d (type %d).", id, c->type); | |
719fc62f | 2191 | channel_free(c); |
7368a6c8 | 2192 | } |
8efc0c15 | 2193 | |
04aa9e67 | 2194 | /* ARGSUSED */ |
6ae2364d | 2195 | void |
7819b5c3 | 2196 | channel_input_open_confirmation(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2197 | { |
7368a6c8 | 2198 | int id, remote_id; |
2199 | Channel *c; | |
5260325f | 2200 | |
7368a6c8 | 2201 | id = packet_get_int(); |
2202 | c = channel_lookup(id); | |
5260325f | 2203 | |
7368a6c8 | 2204 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) |
2205 | packet_disconnect("Received open confirmation for " | |
2206 | "non-opening channel %d.", id); | |
2207 | remote_id = packet_get_int(); | |
aa3378df | 2208 | /* Record the remote channel number and mark that the channel is now open. */ |
7368a6c8 | 2209 | c->remote_id = remote_id; |
2210 | c->type = SSH_CHANNEL_OPEN; | |
7e7327a1 | 2211 | |
2212 | if (compat20) { | |
2213 | c->remote_window = packet_get_int(); | |
2214 | c->remote_maxpacket = packet_get_int(); | |
05ca0898 | 2215 | if (c->confirm) { |
de273eef | 2216 | debug2("callback start"); |
5e96b616 | 2217 | c->confirm(c->self, c->confirm_ctx); |
de273eef | 2218 | debug2("callback done"); |
7e7327a1 | 2219 | } |
d7ac5f18 | 2220 | debug2("channel %d: open confirm rwindow %u rmax %u", c->self, |
7e7327a1 | 2221 | c->remote_window, c->remote_maxpacket); |
2222 | } | |
95500969 | 2223 | packet_check_eom(); |
8efc0c15 | 2224 | } |
2225 | ||
396c147e | 2226 | static char * |
d18e0850 | 2227 | reason2txt(int reason) |
2228 | { | |
6aacefa7 | 2229 | switch (reason) { |
d18e0850 | 2230 | case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED: |
2231 | return "administratively prohibited"; | |
2232 | case SSH2_OPEN_CONNECT_FAILED: | |
2233 | return "connect failed"; | |
2234 | case SSH2_OPEN_UNKNOWN_CHANNEL_TYPE: | |
2235 | return "unknown channel type"; | |
2236 | case SSH2_OPEN_RESOURCE_SHORTAGE: | |
2237 | return "resource shortage"; | |
2238 | } | |
7e8c18e9 | 2239 | return "unknown reason"; |
d18e0850 | 2240 | } |
2241 | ||
04aa9e67 | 2242 | /* ARGSUSED */ |
6ae2364d | 2243 | void |
7819b5c3 | 2244 | channel_input_open_failure(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2245 | { |
02a024dd | 2246 | int id, reason; |
2247 | char *msg = NULL, *lang = NULL; | |
7368a6c8 | 2248 | Channel *c; |
5260325f | 2249 | |
7368a6c8 | 2250 | id = packet_get_int(); |
2251 | c = channel_lookup(id); | |
2252 | ||
2253 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) | |
2254 | packet_disconnect("Received open failure for " | |
2255 | "non-opening channel %d.", id); | |
7e7327a1 | 2256 | if (compat20) { |
02a024dd | 2257 | reason = packet_get_int(); |
fbe90f7b | 2258 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { |
02a024dd | 2259 | msg = packet_get_string(NULL); |
2260 | lang = packet_get_string(NULL); | |
2261 | } | |
bbe88b6d | 2262 | logit("channel %d: open failed: %s%s%s", id, |
d18e0850 | 2263 | reason2txt(reason), msg ? ": ": "", msg ? msg : ""); |
02a024dd | 2264 | if (msg != NULL) |
2265 | xfree(msg); | |
2266 | if (lang != NULL) | |
2267 | xfree(lang); | |
7e7327a1 | 2268 | } |
95500969 | 2269 | packet_check_eom(); |
5260325f | 2270 | /* Free the channel. This will also close the socket. */ |
719fc62f | 2271 | channel_free(c); |
8efc0c15 | 2272 | } |
2273 | ||
04aa9e67 | 2274 | /* ARGSUSED */ |
8e7895b8 | 2275 | void |
7819b5c3 | 2276 | channel_input_window_adjust(int type, u_int32_t seq, void *ctxt) |
8e7895b8 | 2277 | { |
2278 | Channel *c; | |
f91d9a89 | 2279 | int id; |
2280 | u_int adjust; | |
3ffc6336 | 2281 | |
8e7895b8 | 2282 | if (!compat20) |
2283 | return; | |
8efc0c15 | 2284 | |
8e7895b8 | 2285 | /* Get the channel number and verify it. */ |
2286 | id = packet_get_int(); | |
2287 | c = channel_lookup(id); | |
2288 | ||
b872f7f0 | 2289 | if (c == NULL) { |
2290 | logit("Received window adjust for non-open channel %d.", id); | |
8e7895b8 | 2291 | return; |
2292 | } | |
2293 | adjust = packet_get_int(); | |
95500969 | 2294 | packet_check_eom(); |
f91d9a89 | 2295 | debug2("channel %d: rcvd adjust %u", id, adjust); |
8e7895b8 | 2296 | c->remote_window += adjust; |
2297 | } | |
2298 | ||
04aa9e67 | 2299 | /* ARGSUSED */ |
8e7895b8 | 2300 | void |
7819b5c3 | 2301 | channel_input_port_open(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2302 | { |
8e7895b8 | 2303 | Channel *c = NULL; |
2304 | u_short host_port; | |
2305 | char *host, *originator_string; | |
2306 | int remote_id, sock = -1; | |
5260325f | 2307 | |
8e7895b8 | 2308 | remote_id = packet_get_int(); |
2309 | host = packet_get_string(NULL); | |
2310 | host_port = packet_get_int(); | |
2311 | ||
2312 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) { | |
2313 | originator_string = packet_get_string(NULL); | |
2314 | } else { | |
2315 | originator_string = xstrdup("unknown (remote did not supply name)"); | |
2316 | } | |
95500969 | 2317 | packet_check_eom(); |
8e7895b8 | 2318 | sock = channel_connect_to(host, host_port); |
2319 | if (sock != -1) { | |
2320 | c = channel_new("connected socket", | |
2321 | SSH_CHANNEL_CONNECTING, sock, sock, -1, 0, 0, 0, | |
2322 | originator_string, 1); | |
3a0d3d54 | 2323 | c->remote_id = remote_id; |
5260325f | 2324 | } |
0d942eff | 2325 | xfree(originator_string); |
8e7895b8 | 2326 | if (c == NULL) { |
2327 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
2328 | packet_put_int(remote_id); | |
2329 | packet_send(); | |
2330 | } | |
2331 | xfree(host); | |
8efc0c15 | 2332 | } |
2333 | ||
8e7895b8 | 2334 | |
2335 | /* -- tcp forwarding */ | |
2336 | ||
5e4a7219 | 2337 | void |
2338 | channel_set_af(int af) | |
2339 | { | |
2340 | IPv4or6 = af; | |
2341 | } | |
2342 | ||
5641aefa | 2343 | static int |
2344 | channel_setup_fwd_listener(int type, const char *listen_addr, u_short listen_port, | |
2345 | const char *host_to_connect, u_short port_to_connect, int gateway_ports) | |
8efc0c15 | 2346 | { |
719fc62f | 2347 | Channel *c; |
442aee3a | 2348 | int sock, r, success = 0, wildcard = 0, is_client; |
48e671d5 | 2349 | struct addrinfo hints, *ai, *aitop; |
3867aa0a | 2350 | const char *host, *addr; |
5641aefa | 2351 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
5260325f | 2352 | |
5641aefa | 2353 | host = (type == SSH_CHANNEL_RPORT_LISTENER) ? |
2354 | listen_addr : host_to_connect; | |
3867aa0a | 2355 | is_client = (type == SSH_CHANNEL_PORT_LISTENER); |
02a024dd | 2356 | |
5641aefa | 2357 | if (host == NULL) { |
2358 | error("No forward host name."); | |
38946c65 | 2359 | return 0; |
fa08c86b | 2360 | } |
719fc62f | 2361 | if (strlen(host) > SSH_CHANNEL_PATH_LEN - 1) { |
02a024dd | 2362 | error("Forward host name too long."); |
38946c65 | 2363 | return 0; |
02a024dd | 2364 | } |
5260325f | 2365 | |
3867aa0a | 2366 | /* |
2367 | * Determine whether or not a port forward listens to loopback, | |
f8cc7664 | 2368 | * specified address or wildcard. On the client, a specified bind |
2369 | * address will always override gateway_ports. On the server, a | |
2370 | * gateway_ports of 1 (``yes'') will override the client's | |
2371 | * specification and force a wildcard bind, whereas a value of 2 | |
2372 | * (``clientspecified'') will bind to whatever address the client | |
3867aa0a | 2373 | * asked for. |
2374 | * | |
2375 | * Special-case listen_addrs are: | |
2376 | * | |
2377 | * "0.0.0.0" -> wildcard v4/v6 if SSH_OLD_FORWARD_ADDR | |
2378 | * "" (empty string), "*" -> wildcard v4/v6 | |
2379 | * "localhost" -> loopback v4/v6 | |
2380 | */ | |
2381 | addr = NULL; | |
2382 | if (listen_addr == NULL) { | |
2383 | /* No address specified: default to gateway_ports setting */ | |
2384 | if (gateway_ports) | |
2385 | wildcard = 1; | |
2386 | } else if (gateway_ports || is_client) { | |
2387 | if (((datafellows & SSH_OLD_FORWARD_ADDR) && | |
2388 | strcmp(listen_addr, "0.0.0.0") == 0) || | |
2389 | *listen_addr == '\0' || strcmp(listen_addr, "*") == 0 || | |
2390 | (!is_client && gateway_ports == 1)) | |
2391 | wildcard = 1; | |
2392 | else if (strcmp(listen_addr, "localhost") != 0) | |
2393 | addr = listen_addr; | |
2394 | } | |
2395 | ||
2396 | debug3("channel_setup_fwd_listener: type %d wildcard %d addr %s", | |
2397 | type, wildcard, (addr == NULL) ? "NULL" : addr); | |
2398 | ||
aa3378df | 2399 | /* |
48e671d5 | 2400 | * getaddrinfo returns a loopback address if the hostname is |
2401 | * set to NULL and hints.ai_flags is not AI_PASSIVE | |
aa3378df | 2402 | */ |
48e671d5 | 2403 | memset(&hints, 0, sizeof(hints)); |
2404 | hints.ai_family = IPv4or6; | |
3867aa0a | 2405 | hints.ai_flags = wildcard ? AI_PASSIVE : 0; |
48e671d5 | 2406 | hints.ai_socktype = SOCK_STREAM; |
fa08c86b | 2407 | snprintf(strport, sizeof strport, "%d", listen_port); |
3867aa0a | 2408 | if ((r = getaddrinfo(addr, strport, &hints, &aitop)) != 0) { |
2409 | if (addr == NULL) { | |
2410 | /* This really shouldn't happen */ | |
2411 | packet_disconnect("getaddrinfo: fatal error: %s", | |
bb4626fe | 2412 | ssh_gai_strerror(r)); |
3867aa0a | 2413 | } else { |
38946c65 | 2414 | error("channel_setup_fwd_listener: " |
bb4626fe | 2415 | "getaddrinfo(%.64s): %s", addr, |
2416 | ssh_gai_strerror(r)); | |
3867aa0a | 2417 | } |
38946c65 | 2418 | return 0; |
3867aa0a | 2419 | } |
48e671d5 | 2420 | |
48e671d5 | 2421 | for (ai = aitop; ai; ai = ai->ai_next) { |
2422 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
2423 | continue; | |
2424 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), | |
2425 | strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { | |
5641aefa | 2426 | error("channel_setup_fwd_listener: getnameinfo failed"); |
48e671d5 | 2427 | continue; |
2428 | } | |
2429 | /* Create a port to listen for the host. */ | |
3e131a6d | 2430 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
48e671d5 | 2431 | if (sock < 0) { |
2432 | /* this is no error since kernel may not support ipv6 */ | |
2433 | verbose("socket: %.100s", strerror(errno)); | |
2434 | continue; | |
2435 | } | |
442aee3a | 2436 | |
2437 | channel_set_reuseaddr(sock); | |
facfd613 | 2438 | |
48e671d5 | 2439 | debug("Local forwarding listening on %s port %s.", ntop, strport); |
2440 | ||
2441 | /* Bind the socket to the address. */ | |
2442 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { | |
2443 | /* address can be in use ipv6 address is already bound */ | |
16218745 | 2444 | if (!ai->ai_next) |
2445 | error("bind: %.100s", strerror(errno)); | |
2446 | else | |
2447 | verbose("bind: %.100s", strerror(errno)); | |
2b87da3b | 2448 | |
48e671d5 | 2449 | close(sock); |
2450 | continue; | |
2451 | } | |
2452 | /* Start listening for connections on the socket. */ | |
fce39749 | 2453 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { |
48e671d5 | 2454 | error("listen: %.100s", strerror(errno)); |
2455 | close(sock); | |
2456 | continue; | |
2457 | } | |
2458 | /* Allocate a channel number for the socket. */ | |
8e7895b8 | 2459 | c = channel_new("port listener", type, sock, sock, -1, |
0b242b12 | 2460 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, |
0d942eff | 2461 | 0, "port listener", 1); |
719fc62f | 2462 | strlcpy(c->path, host, sizeof(c->path)); |
2463 | c->host_port = port_to_connect; | |
2464 | c->listening_port = listen_port; | |
48e671d5 | 2465 | success = 1; |
2466 | } | |
2467 | if (success == 0) | |
5641aefa | 2468 | error("channel_setup_fwd_listener: cannot listen to port: %d", |
02a024dd | 2469 | listen_port); |
48e671d5 | 2470 | freeaddrinfo(aitop); |
02a024dd | 2471 | return success; |
5260325f | 2472 | } |
8efc0c15 | 2473 | |
d740ec16 | 2474 | int |
2475 | channel_cancel_rport_listener(const char *host, u_short port) | |
2476 | { | |
9a995072 | 2477 | u_int i; |
2478 | int found = 0; | |
d740ec16 | 2479 | |
f8cc7664 | 2480 | for (i = 0; i < channels_alloc; i++) { |
d740ec16 | 2481 | Channel *c = channels[i]; |
2482 | ||
2483 | if (c != NULL && c->type == SSH_CHANNEL_RPORT_LISTENER && | |
2484 | strncmp(c->path, host, sizeof(c->path)) == 0 && | |
f2107e97 | 2485 | c->listening_port == port) { |
2912cbd6 | 2486 | debug2("%s: close channel %d", __func__, i); |
d740ec16 | 2487 | channel_free(c); |
2488 | found = 1; | |
2489 | } | |
2490 | } | |
2491 | ||
2492 | return (found); | |
2493 | } | |
2494 | ||
5641aefa | 2495 | /* protocol local port fwd, used by ssh (and sshd in v1) */ |
2496 | int | |
3867aa0a | 2497 | channel_setup_local_fwd_listener(const char *listen_host, u_short listen_port, |
5641aefa | 2498 | const char *host_to_connect, u_short port_to_connect, int gateway_ports) |
2499 | { | |
2500 | return channel_setup_fwd_listener(SSH_CHANNEL_PORT_LISTENER, | |
3867aa0a | 2501 | listen_host, listen_port, host_to_connect, port_to_connect, |
2502 | gateway_ports); | |
5641aefa | 2503 | } |
2504 | ||
2505 | /* protocol v2 remote port fwd, used by sshd */ | |
2506 | int | |
2507 | channel_setup_remote_fwd_listener(const char *listen_address, | |
2508 | u_short listen_port, int gateway_ports) | |
2509 | { | |
2510 | return channel_setup_fwd_listener(SSH_CHANNEL_RPORT_LISTENER, | |
2511 | listen_address, listen_port, NULL, 0, gateway_ports); | |
2512 | } | |
2513 | ||
aa3378df | 2514 | /* |
2515 | * Initiate forwarding of connections to port "port" on remote host through | |
2516 | * the secure channel to host:port from local side. | |
2517 | */ | |
8efc0c15 | 2518 | |
42ea6f5e | 2519 | int |
3867aa0a | 2520 | channel_request_remote_forwarding(const char *listen_host, u_short listen_port, |
fa08c86b | 2521 | const char *host_to_connect, u_short port_to_connect) |
8efc0c15 | 2522 | { |
54a5250f | 2523 | int type, success = 0; |
fa08c86b | 2524 | |
5260325f | 2525 | /* Record locally that connection to this host/port is permitted. */ |
2526 | if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
2527 | fatal("channel_request_remote_forwarding: too many forwards"); | |
2528 | ||
5260325f | 2529 | /* Send the forward request to the remote side. */ |
7e7327a1 | 2530 | if (compat20) { |
3867aa0a | 2531 | const char *address_to_bind; |
04efe9b0 | 2532 | if (listen_host == NULL) { |
2533 | if (datafellows & SSH_BUG_RFWD_ADDR) | |
2534 | address_to_bind = "127.0.0.1"; | |
2535 | else | |
2536 | address_to_bind = "localhost"; | |
2537 | } else if (*listen_host == '\0' || | |
2538 | strcmp(listen_host, "*") == 0) { | |
2539 | if (datafellows & SSH_BUG_RFWD_ADDR) | |
2540 | address_to_bind = "0.0.0.0"; | |
2541 | else | |
2542 | address_to_bind = ""; | |
2543 | } else | |
3867aa0a | 2544 | address_to_bind = listen_host; |
2545 | ||
7e7327a1 | 2546 | packet_start(SSH2_MSG_GLOBAL_REQUEST); |
2547 | packet_put_cstring("tcpip-forward"); | |
e0ae8728 | 2548 | packet_put_char(1); /* boolean: want reply */ |
7e7327a1 | 2549 | packet_put_cstring(address_to_bind); |
2550 | packet_put_int(listen_port); | |
fa08c86b | 2551 | packet_send(); |
2552 | packet_write_wait(); | |
2553 | /* Assume that server accepts the request */ | |
2554 | success = 1; | |
7e7327a1 | 2555 | } else { |
2556 | packet_start(SSH_CMSG_PORT_FORWARD_REQUEST); | |
7e7327a1 | 2557 | packet_put_int(listen_port); |
d6f24e45 | 2558 | packet_put_cstring(host_to_connect); |
2559 | packet_put_int(port_to_connect); | |
7e7327a1 | 2560 | packet_send(); |
2561 | packet_write_wait(); | |
fa08c86b | 2562 | |
2563 | /* Wait for response from the remote side. */ | |
54a5250f | 2564 | type = packet_read(); |
fa08c86b | 2565 | switch (type) { |
2566 | case SSH_SMSG_SUCCESS: | |
2567 | success = 1; | |
2568 | break; | |
2569 | case SSH_SMSG_FAILURE: | |
fa08c86b | 2570 | break; |
2571 | default: | |
2572 | /* Unknown packet */ | |
2573 | packet_disconnect("Protocol error for port forward request:" | |
2574 | "received packet type %d.", type); | |
2575 | } | |
2576 | } | |
2577 | if (success) { | |
2578 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host_to_connect); | |
2579 | permitted_opens[num_permitted_opens].port_to_connect = port_to_connect; | |
2580 | permitted_opens[num_permitted_opens].listen_port = listen_port; | |
2581 | num_permitted_opens++; | |
7e7327a1 | 2582 | } |
42ea6f5e | 2583 | return (success ? 0 : -1); |
8efc0c15 | 2584 | } |
2585 | ||
d740ec16 | 2586 | /* |
f2107e97 | 2587 | * Request cancellation of remote forwarding of connection host:port from |
d740ec16 | 2588 | * local side. |
2589 | */ | |
d740ec16 | 2590 | void |
3867aa0a | 2591 | channel_request_rforward_cancel(const char *host, u_short port) |
d740ec16 | 2592 | { |
2593 | int i; | |
d740ec16 | 2594 | |
2595 | if (!compat20) | |
2596 | return; | |
2597 | ||
2598 | for (i = 0; i < num_permitted_opens; i++) { | |
f2107e97 | 2599 | if (permitted_opens[i].host_to_connect != NULL && |
d740ec16 | 2600 | permitted_opens[i].listen_port == port) |
2601 | break; | |
2602 | } | |
2603 | if (i >= num_permitted_opens) { | |
2604 | debug("%s: requested forward not found", __func__); | |
2605 | return; | |
2606 | } | |
2607 | packet_start(SSH2_MSG_GLOBAL_REQUEST); | |
2608 | packet_put_cstring("cancel-tcpip-forward"); | |
2609 | packet_put_char(0); | |
3867aa0a | 2610 | packet_put_cstring(host == NULL ? "" : host); |
d740ec16 | 2611 | packet_put_int(port); |
2612 | packet_send(); | |
2613 | ||
2614 | permitted_opens[i].listen_port = 0; | |
2615 | permitted_opens[i].port_to_connect = 0; | |
8c4bd764 | 2616 | xfree(permitted_opens[i].host_to_connect); |
d740ec16 | 2617 | permitted_opens[i].host_to_connect = NULL; |
2618 | } | |
2619 | ||
aa3378df | 2620 | /* |
2621 | * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates | |
2622 | * listening for the port, and sends back a success reply (or disconnect | |
42ea6f5e | 2623 | * message if there was an error). |
aa3378df | 2624 | */ |
42ea6f5e | 2625 | int |
1d1ffb87 | 2626 | channel_input_port_forward_request(int is_root, int gateway_ports) |
8efc0c15 | 2627 | { |
57112b5a | 2628 | u_short port, host_port; |
42ea6f5e | 2629 | int success = 0; |
5260325f | 2630 | char *hostname; |
2631 | ||
2632 | /* Get arguments from the packet. */ | |
2633 | port = packet_get_int(); | |
2634 | hostname = packet_get_string(NULL); | |
2635 | host_port = packet_get_int(); | |
2636 | ||
3c62e7eb | 2637 | #ifndef HAVE_CYGWIN |
aa3378df | 2638 | /* |
2639 | * Check that an unprivileged user is not trying to forward a | |
2640 | * privileged port. | |
2641 | */ | |
5260325f | 2642 | if (port < IPPORT_RESERVED && !is_root) |
8e7c9afc | 2643 | packet_disconnect( |
2644 | "Requested forwarding of port %d but user is not root.", | |
2645 | port); | |
2646 | if (host_port == 0) | |
2647 | packet_disconnect("Dynamic forwarding denied."); | |
3c62e7eb | 2648 | #endif |
8e7c9afc | 2649 | |
fa08c86b | 2650 | /* Initiate forwarding */ |
42ea6f5e | 2651 | success = channel_setup_local_fwd_listener(NULL, port, hostname, |
3867aa0a | 2652 | host_port, gateway_ports); |
5260325f | 2653 | |
2654 | /* Free the argument string. */ | |
2655 | xfree(hostname); | |
42ea6f5e | 2656 | |
2657 | return (success ? 0 : -1); | |
8efc0c15 | 2658 | } |
2659 | ||
01794848 | 2660 | /* |
2661 | * Permits opening to any host/port if permitted_opens[] is empty. This is | |
2662 | * usually called by the server, because the user could connect to any port | |
2663 | * anyway, and the server has no way to know but to trust the client anyway. | |
2664 | */ | |
2665 | void | |
d5bb9418 | 2666 | channel_permit_all_opens(void) |
01794848 | 2667 | { |
2668 | if (num_permitted_opens == 0) | |
2669 | all_opens_permitted = 1; | |
2670 | } | |
2671 | ||
cd332296 | 2672 | void |
01794848 | 2673 | channel_add_permitted_opens(char *host, int port) |
2674 | { | |
2675 | if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
42ea6f5e | 2676 | fatal("channel_add_permitted_opens: too many forwards"); |
01794848 | 2677 | debug("allow port forwarding to host %s port %d", host, port); |
2678 | ||
2679 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host); | |
2680 | permitted_opens[num_permitted_opens].port_to_connect = port; | |
2681 | num_permitted_opens++; | |
2682 | ||
2683 | all_opens_permitted = 0; | |
2684 | } | |
2685 | ||
ea46e550 | 2686 | int |
2fefbadf | 2687 | channel_add_adm_permitted_opens(char *host, int port) |
2688 | { | |
2689 | if (num_adm_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
2690 | fatal("channel_add_adm_permitted_opens: too many forwards"); | |
ea46e550 | 2691 | debug("config allows port forwarding to host %s port %d", host, port); |
2fefbadf | 2692 | |
2693 | permitted_adm_opens[num_adm_permitted_opens].host_to_connect | |
2694 | = xstrdup(host); | |
2695 | permitted_adm_opens[num_adm_permitted_opens].port_to_connect = port; | |
ea46e550 | 2696 | return ++num_adm_permitted_opens; |
2fefbadf | 2697 | } |
2698 | ||
cd332296 | 2699 | void |
01794848 | 2700 | channel_clear_permitted_opens(void) |
2701 | { | |
2702 | int i; | |
2703 | ||
2704 | for (i = 0; i < num_permitted_opens; i++) | |
d740ec16 | 2705 | if (permitted_opens[i].host_to_connect != NULL) |
2706 | xfree(permitted_opens[i].host_to_connect); | |
01794848 | 2707 | num_permitted_opens = 0; |
2fefbadf | 2708 | } |
2709 | ||
2710 | void | |
2711 | channel_clear_adm_permitted_opens(void) | |
2712 | { | |
2713 | int i; | |
01794848 | 2714 | |
2fefbadf | 2715 | for (i = 0; i < num_adm_permitted_opens; i++) |
2716 | if (permitted_adm_opens[i].host_to_connect != NULL) | |
2717 | xfree(permitted_adm_opens[i].host_to_connect); | |
2718 | num_adm_permitted_opens = 0; | |
01794848 | 2719 | } |
2720 | ||
01794848 | 2721 | /* return socket to remote host, port */ |
396c147e | 2722 | static int |
01794848 | 2723 | connect_to(const char *host, u_short port) |
8efc0c15 | 2724 | { |
48e671d5 | 2725 | struct addrinfo hints, *ai, *aitop; |
2726 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; | |
2727 | int gaierr; | |
7368a6c8 | 2728 | int sock = -1; |
48e671d5 | 2729 | |
2730 | memset(&hints, 0, sizeof(hints)); | |
2731 | hints.ai_family = IPv4or6; | |
2732 | hints.ai_socktype = SOCK_STREAM; | |
01794848 | 2733 | snprintf(strport, sizeof strport, "%d", port); |
48e671d5 | 2734 | if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) { |
01794848 | 2735 | error("connect_to %.100s: unknown host (%s)", host, |
bb4626fe | 2736 | ssh_gai_strerror(gaierr)); |
7368a6c8 | 2737 | return -1; |
48e671d5 | 2738 | } |
48e671d5 | 2739 | for (ai = aitop; ai; ai = ai->ai_next) { |
2740 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
2741 | continue; | |
2742 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), | |
2743 | strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { | |
01794848 | 2744 | error("connect_to: getnameinfo failed"); |
48e671d5 | 2745 | continue; |
5260325f | 2746 | } |
3e131a6d | 2747 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
48e671d5 | 2748 | if (sock < 0) { |
4940c411 | 2749 | if (ai->ai_next == NULL) |
2750 | error("socket: %.100s", strerror(errno)); | |
2751 | else | |
2752 | verbose("socket: %.100s", strerror(errno)); | |
48e671d5 | 2753 | continue; |
5260325f | 2754 | } |
170694d7 | 2755 | if (set_nonblock(sock) == -1) |
2756 | fatal("%s: set_nonblock(%d)", __func__, sock); | |
97fb6912 | 2757 | if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0 && |
2758 | errno != EINPROGRESS) { | |
01794848 | 2759 | error("connect_to %.100s port %s: %.100s", ntop, strport, |
48e671d5 | 2760 | strerror(errno)); |
2761 | close(sock); | |
2b87da3b | 2762 | continue; /* fail -- try next */ |
48e671d5 | 2763 | } |
2764 | break; /* success */ | |
5260325f | 2765 | |
5260325f | 2766 | } |
48e671d5 | 2767 | freeaddrinfo(aitop); |
48e671d5 | 2768 | if (!ai) { |
01794848 | 2769 | error("connect_to %.100s port %d: failed.", host, port); |
7368a6c8 | 2770 | return -1; |
8efc0c15 | 2771 | } |
7368a6c8 | 2772 | /* success */ |
811a6342 | 2773 | set_nodelay(sock); |
7368a6c8 | 2774 | return sock; |
2775 | } | |
01794848 | 2776 | |
fa08c86b | 2777 | int |
b3f8a79c | 2778 | channel_connect_by_listen_address(u_short listen_port) |
fa08c86b | 2779 | { |
2780 | int i; | |
01794848 | 2781 | |
fa08c86b | 2782 | for (i = 0; i < num_permitted_opens; i++) |
d740ec16 | 2783 | if (permitted_opens[i].host_to_connect != NULL && |
2784 | permitted_opens[i].listen_port == listen_port) | |
01794848 | 2785 | return connect_to( |
fa08c86b | 2786 | permitted_opens[i].host_to_connect, |
2787 | permitted_opens[i].port_to_connect); | |
0b6fbf03 | 2788 | error("WARNING: Server requests forwarding for unknown listen_port %d", |
2789 | listen_port); | |
fa08c86b | 2790 | return -1; |
2791 | } | |
48e671d5 | 2792 | |
01794848 | 2793 | /* Check if connecting to that port is permitted and connect. */ |
2794 | int | |
2795 | channel_connect_to(const char *host, u_short port) | |
2796 | { | |
2fefbadf | 2797 | int i, permit, permit_adm = 1; |
01794848 | 2798 | |
2799 | permit = all_opens_permitted; | |
2800 | if (!permit) { | |
2801 | for (i = 0; i < num_permitted_opens; i++) | |
d740ec16 | 2802 | if (permitted_opens[i].host_to_connect != NULL && |
2803 | permitted_opens[i].port_to_connect == port && | |
01794848 | 2804 | strcmp(permitted_opens[i].host_to_connect, host) == 0) |
2805 | permit = 1; | |
2fefbadf | 2806 | } |
01794848 | 2807 | |
2fefbadf | 2808 | if (num_adm_permitted_opens > 0) { |
2809 | permit_adm = 0; | |
2810 | for (i = 0; i < num_adm_permitted_opens; i++) | |
2811 | if (permitted_adm_opens[i].host_to_connect != NULL && | |
2812 | permitted_adm_opens[i].port_to_connect == port && | |
2813 | strcmp(permitted_adm_opens[i].host_to_connect, host) | |
2814 | == 0) | |
2815 | permit_adm = 1; | |
01794848 | 2816 | } |
2fefbadf | 2817 | |
2818 | if (!permit || !permit_adm) { | |
bbe88b6d | 2819 | logit("Received request to connect to host %.100s port %d, " |
01794848 | 2820 | "but the request was denied.", host, port); |
2821 | return -1; | |
2822 | } | |
2823 | return connect_to(host, port); | |
2824 | } | |
2825 | ||
5e96b616 | 2826 | void |
2827 | channel_send_window_changes(void) | |
2828 | { | |
9a995072 | 2829 | u_int i; |
5e96b616 | 2830 | struct winsize ws; |
2831 | ||
2832 | for (i = 0; i < channels_alloc; i++) { | |
f8cc7664 | 2833 | if (channels[i] == NULL || !channels[i]->client_tty || |
5e96b616 | 2834 | channels[i]->type != SSH_CHANNEL_OPEN) |
2835 | continue; | |
2836 | if (ioctl(channels[i]->rfd, TIOCGWINSZ, &ws) < 0) | |
2837 | continue; | |
2838 | channel_request_start(i, "window-change", 0); | |
148de80c | 2839 | packet_put_int((u_int)ws.ws_col); |
2840 | packet_put_int((u_int)ws.ws_row); | |
2841 | packet_put_int((u_int)ws.ws_xpixel); | |
2842 | packet_put_int((u_int)ws.ws_ypixel); | |
5e96b616 | 2843 | packet_send(); |
2844 | } | |
2845 | } | |
2846 | ||
8e7895b8 | 2847 | /* -- X11 forwarding */ |
8efc0c15 | 2848 | |
aa3378df | 2849 | /* |
2850 | * Creates an internet domain socket for listening for X11 connections. | |
57f228e8 | 2851 | * Returns 0 and a suitable display number for the DISPLAY variable |
2852 | * stored in display_numberp , or -1 if an error occurs. | |
aa3378df | 2853 | */ |
c9d0ad9b | 2854 | int |
e6e573bd | 2855 | x11_create_display_inet(int x11_display_offset, int x11_use_localhost, |
d08341e6 | 2856 | int single_connection, u_int *display_numberp, int **chanids) |
8efc0c15 | 2857 | { |
ac151b18 | 2858 | Channel *nc = NULL; |
57112b5a | 2859 | int display_number, sock; |
2860 | u_short port; | |
48e671d5 | 2861 | struct addrinfo hints, *ai, *aitop; |
2862 | char strport[NI_MAXSERV]; | |
2863 | int gaierr, n, num_socks = 0, socks[NUM_SOCKS]; | |
5260325f | 2864 | |
59e5aff5 | 2865 | if (chanids == NULL) |
2866 | return -1; | |
2867 | ||
95f1eccc | 2868 | for (display_number = x11_display_offset; |
184eed6a | 2869 | display_number < MAX_DISPLAYS; |
2870 | display_number++) { | |
5260325f | 2871 | port = 6000 + display_number; |
48e671d5 | 2872 | memset(&hints, 0, sizeof(hints)); |
2873 | hints.ai_family = IPv4or6; | |
e6e573bd | 2874 | hints.ai_flags = x11_use_localhost ? 0: AI_PASSIVE; |
48e671d5 | 2875 | hints.ai_socktype = SOCK_STREAM; |
2876 | snprintf(strport, sizeof strport, "%d", port); | |
2877 | if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) { | |
bb4626fe | 2878 | error("getaddrinfo: %.100s", ssh_gai_strerror(gaierr)); |
c9d0ad9b | 2879 | return -1; |
5260325f | 2880 | } |
48e671d5 | 2881 | for (ai = aitop; ai; ai = ai->ai_next) { |
2882 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
2883 | continue; | |
3e131a6d | 2884 | sock = socket(ai->ai_family, ai->ai_socktype, |
2885 | ai->ai_protocol); | |
48e671d5 | 2886 | if (sock < 0) { |
4ee81249 | 2887 | if ((errno != EINVAL) && (errno != EAFNOSUPPORT)) { |
80a44451 | 2888 | error("socket: %.100s", strerror(errno)); |
0ea89f7e | 2889 | freeaddrinfo(aitop); |
c9d0ad9b | 2890 | return -1; |
80a44451 | 2891 | } else { |
22d89d24 | 2892 | debug("x11_create_display_inet: Socket family %d not supported", |
2893 | ai->ai_family); | |
80a44451 | 2894 | continue; |
2895 | } | |
48e671d5 | 2896 | } |
688aaeda | 2897 | #ifdef IPV6_V6ONLY |
2898 | if (ai->ai_family == AF_INET6) { | |
2899 | int on = 1; | |
2900 | if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) < 0) | |
2901 | error("setsockopt IPV6_V6ONLY: %.100s", strerror(errno)); | |
2902 | } | |
2903 | #endif | |
442aee3a | 2904 | channel_set_reuseaddr(sock); |
48e671d5 | 2905 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { |
d7ac5f18 | 2906 | debug2("bind port %d: %.100s", port, strerror(errno)); |
48e671d5 | 2907 | close(sock); |
16218745 | 2908 | |
2909 | if (ai->ai_next) | |
2910 | continue; | |
2911 | ||
48e671d5 | 2912 | for (n = 0; n < num_socks; n++) { |
48e671d5 | 2913 | close(socks[n]); |
2914 | } | |
2915 | num_socks = 0; | |
2916 | break; | |
2917 | } | |
2918 | socks[num_socks++] = sock; | |
80faa19f | 2919 | #ifndef DONT_TRY_OTHER_AF |
48e671d5 | 2920 | if (num_socks == NUM_SOCKS) |
2921 | break; | |
80faa19f | 2922 | #else |
688aaeda | 2923 | if (x11_use_localhost) { |
2924 | if (num_socks == NUM_SOCKS) | |
2925 | break; | |
2926 | } else { | |
2927 | break; | |
2928 | } | |
80faa19f | 2929 | #endif |
5260325f | 2930 | } |
4ccb01d6 | 2931 | freeaddrinfo(aitop); |
48e671d5 | 2932 | if (num_socks > 0) |
2933 | break; | |
5260325f | 2934 | } |
2935 | if (display_number >= MAX_DISPLAYS) { | |
2936 | error("Failed to allocate internet-domain X11 display socket."); | |
c9d0ad9b | 2937 | return -1; |
8efc0c15 | 2938 | } |
5260325f | 2939 | /* Start listening for connections on the socket. */ |
48e671d5 | 2940 | for (n = 0; n < num_socks; n++) { |
2941 | sock = socks[n]; | |
fce39749 | 2942 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { |
48e671d5 | 2943 | error("listen: %.100s", strerror(errno)); |
48e671d5 | 2944 | close(sock); |
c9d0ad9b | 2945 | return -1; |
a7effaac | 2946 | } |
a7effaac | 2947 | } |
5260325f | 2948 | |
48e671d5 | 2949 | /* Allocate a channel for each socket. */ |
52e3daed | 2950 | *chanids = xcalloc(num_socks + 1, sizeof(**chanids)); |
48e671d5 | 2951 | for (n = 0; n < num_socks; n++) { |
2952 | sock = socks[n]; | |
ac151b18 | 2953 | nc = channel_new("x11 listener", |
0b242b12 | 2954 | SSH_CHANNEL_X11_LISTENER, sock, sock, -1, |
2955 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, | |
0d942eff | 2956 | 0, "X11 inet listener", 1); |
3a0d3d54 | 2957 | nc->single_connection = single_connection; |
59e5aff5 | 2958 | (*chanids)[n] = nc->self; |
48e671d5 | 2959 | } |
59e5aff5 | 2960 | (*chanids)[n] = -1; |
5260325f | 2961 | |
c9d0ad9b | 2962 | /* Return the display number for the DISPLAY environment variable. */ |
57f228e8 | 2963 | *display_numberp = display_number; |
2964 | return (0); | |
8efc0c15 | 2965 | } |
2966 | ||
396c147e | 2967 | static int |
1e3b8b07 | 2968 | connect_local_xsocket(u_int dnr) |
8efc0c15 | 2969 | { |
5260325f | 2970 | int sock; |
2971 | struct sockaddr_un addr; | |
5260325f | 2972 | |
805e659f | 2973 | sock = socket(AF_UNIX, SOCK_STREAM, 0); |
2974 | if (sock < 0) | |
2975 | error("socket: %.100s", strerror(errno)); | |
2976 | memset(&addr, 0, sizeof(addr)); | |
2977 | addr.sun_family = AF_UNIX; | |
2978 | snprintf(addr.sun_path, sizeof addr.sun_path, _PATH_UNIX_X, dnr); | |
32596c7b | 2979 | if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) == 0) |
805e659f | 2980 | return sock; |
2981 | close(sock); | |
5260325f | 2982 | error("connect %.100s: %.100s", addr.sun_path, strerror(errno)); |
2983 | return -1; | |
8efc0c15 | 2984 | } |
2985 | ||
0b242b12 | 2986 | int |
2987 | x11_connect_display(void) | |
8efc0c15 | 2988 | { |
4f16046f | 2989 | u_int display_number; |
5260325f | 2990 | const char *display; |
0b242b12 | 2991 | char buf[1024], *cp; |
48e671d5 | 2992 | struct addrinfo hints, *ai, *aitop; |
2993 | char strport[NI_MAXSERV]; | |
4f16046f | 2994 | int gaierr, sock = 0; |
5260325f | 2995 | |
5260325f | 2996 | /* Try to open a socket for the local X server. */ |
2997 | display = getenv("DISPLAY"); | |
2998 | if (!display) { | |
2999 | error("DISPLAY not set."); | |
0b242b12 | 3000 | return -1; |
5260325f | 3001 | } |
aa3378df | 3002 | /* |
3003 | * Now we decode the value of the DISPLAY variable and make a | |
3004 | * connection to the real X server. | |
3005 | */ | |
3006 | ||
3007 | /* | |
3008 | * Check if it is a unix domain socket. Unix domain displays are in | |
3009 | * one of the following formats: unix:d[.s], :d[.s], ::d[.s] | |
3010 | */ | |
5260325f | 3011 | if (strncmp(display, "unix:", 5) == 0 || |
3012 | display[0] == ':') { | |
3013 | /* Connect to the unix domain socket. */ | |
4f16046f | 3014 | if (sscanf(strrchr(display, ':') + 1, "%u", &display_number) != 1) { |
5260325f | 3015 | error("Could not parse display number from DISPLAY: %.100s", |
184eed6a | 3016 | display); |
0b242b12 | 3017 | return -1; |
5260325f | 3018 | } |
3019 | /* Create a socket. */ | |
3020 | sock = connect_local_xsocket(display_number); | |
3021 | if (sock < 0) | |
0b242b12 | 3022 | return -1; |
5260325f | 3023 | |
3024 | /* OK, we now have a connection to the display. */ | |
0b242b12 | 3025 | return sock; |
5260325f | 3026 | } |
aa3378df | 3027 | /* |
3028 | * Connect to an inet socket. The DISPLAY value is supposedly | |
3029 | * hostname:d[.s], where hostname may also be numeric IP address. | |
3030 | */ | |
74860245 | 3031 | strlcpy(buf, display, sizeof(buf)); |
5260325f | 3032 | cp = strchr(buf, ':'); |
3033 | if (!cp) { | |
3034 | error("Could not find ':' in DISPLAY: %.100s", display); | |
0b242b12 | 3035 | return -1; |
5260325f | 3036 | } |
3037 | *cp = 0; | |
aa3378df | 3038 | /* buf now contains the host name. But first we parse the display number. */ |
4f16046f | 3039 | if (sscanf(cp + 1, "%u", &display_number) != 1) { |
5260325f | 3040 | error("Could not parse display number from DISPLAY: %.100s", |
184eed6a | 3041 | display); |
0b242b12 | 3042 | return -1; |
5260325f | 3043 | } |
5260325f | 3044 | |
48e671d5 | 3045 | /* Look up the host address */ |
3046 | memset(&hints, 0, sizeof(hints)); | |
3047 | hints.ai_family = IPv4or6; | |
3048 | hints.ai_socktype = SOCK_STREAM; | |
4f16046f | 3049 | snprintf(strport, sizeof strport, "%u", 6000 + display_number); |
48e671d5 | 3050 | if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) { |
bb4626fe | 3051 | error("%.100s: unknown host. (%s)", buf, |
3052 | ssh_gai_strerror(gaierr)); | |
0b242b12 | 3053 | return -1; |
8efc0c15 | 3054 | } |
48e671d5 | 3055 | for (ai = aitop; ai; ai = ai->ai_next) { |
3056 | /* Create a socket. */ | |
3e131a6d | 3057 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
48e671d5 | 3058 | if (sock < 0) { |
d7ac5f18 | 3059 | debug2("socket: %.100s", strerror(errno)); |
7368a6c8 | 3060 | continue; |
3061 | } | |
3062 | /* Connect it to the display. */ | |
3063 | if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) { | |
4f16046f | 3064 | debug2("connect %.100s port %u: %.100s", buf, |
7368a6c8 | 3065 | 6000 + display_number, strerror(errno)); |
3066 | close(sock); | |
3067 | continue; | |
3068 | } | |
3069 | /* Success */ | |
3070 | break; | |
48e671d5 | 3071 | } |
48e671d5 | 3072 | freeaddrinfo(aitop); |
3073 | if (!ai) { | |
4f16046f | 3074 | error("connect %.100s port %u: %.100s", buf, 6000 + display_number, |
48e671d5 | 3075 | strerror(errno)); |
0b242b12 | 3076 | return -1; |
8efc0c15 | 3077 | } |
bcc0381e | 3078 | set_nodelay(sock); |
0b242b12 | 3079 | return sock; |
3080 | } | |
5260325f | 3081 | |
0b242b12 | 3082 | /* |
3083 | * This is called when SSH_SMSG_X11_OPEN is received. The packet contains | |
3084 | * the remote channel number. We should do whatever we want, and respond | |
3085 | * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE. | |
3086 | */ | |
5260325f | 3087 | |
ebb90778 | 3088 | /* ARGSUSED */ |
0b242b12 | 3089 | void |
7819b5c3 | 3090 | x11_input_open(int type, u_int32_t seq, void *ctxt) |
0b242b12 | 3091 | { |
719fc62f | 3092 | Channel *c = NULL; |
3093 | int remote_id, sock = 0; | |
0b242b12 | 3094 | char *remote_host; |
5260325f | 3095 | |
719fc62f | 3096 | debug("Received X11 open request."); |
5260325f | 3097 | |
719fc62f | 3098 | remote_id = packet_get_int(); |
8e7895b8 | 3099 | |
3100 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) { | |
719fc62f | 3101 | remote_host = packet_get_string(NULL); |
0b242b12 | 3102 | } else { |
3103 | remote_host = xstrdup("unknown (remote did not supply name)"); | |
0b242b12 | 3104 | } |
95500969 | 3105 | packet_check_eom(); |
0b242b12 | 3106 | |
3107 | /* Obtain a connection to the real X display. */ | |
3108 | sock = x11_connect_display(); | |
719fc62f | 3109 | if (sock != -1) { |
3110 | /* Allocate a channel for this connection. */ | |
3111 | c = channel_new("connected x11 socket", | |
3112 | SSH_CHANNEL_X11_OPEN, sock, sock, -1, 0, 0, 0, | |
3113 | remote_host, 1); | |
3a0d3d54 | 3114 | c->remote_id = remote_id; |
3115 | c->force_drain = 1; | |
719fc62f | 3116 | } |
0d942eff | 3117 | xfree(remote_host); |
719fc62f | 3118 | if (c == NULL) { |
0b242b12 | 3119 | /* Send refusal to the remote host. */ |
3120 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
719fc62f | 3121 | packet_put_int(remote_id); |
0b242b12 | 3122 | } else { |
0b242b12 | 3123 | /* Send a confirmation to the remote host. */ |
3124 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
719fc62f | 3125 | packet_put_int(remote_id); |
3126 | packet_put_int(c->self); | |
0b242b12 | 3127 | } |
719fc62f | 3128 | packet_send(); |
8efc0c15 | 3129 | } |
3130 | ||
a22aff1f | 3131 | /* dummy protocol handler that denies SSH-1 requests (agent/x11) */ |
ebb90778 | 3132 | /* ARGSUSED */ |
a22aff1f | 3133 | void |
7819b5c3 | 3134 | deny_input_open(int type, u_int32_t seq, void *ctxt) |
a22aff1f | 3135 | { |
3136 | int rchan = packet_get_int(); | |
e1feb9bf | 3137 | |
6aacefa7 | 3138 | switch (type) { |
a22aff1f | 3139 | case SSH_SMSG_AGENT_OPEN: |
3140 | error("Warning: ssh server tried agent forwarding."); | |
3141 | break; | |
3142 | case SSH_SMSG_X11_OPEN: | |
3143 | error("Warning: ssh server tried X11 forwarding."); | |
3144 | break; | |
3145 | default: | |
7819b5c3 | 3146 | error("deny_input_open: type %d", type); |
a22aff1f | 3147 | break; |
3148 | } | |
1908529f | 3149 | error("Warning: this is probably a break-in attempt by a malicious server."); |
a22aff1f | 3150 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
3151 | packet_put_int(rchan); | |
3152 | packet_send(); | |
3153 | } | |
3154 | ||
aa3378df | 3155 | /* |
3156 | * Requests forwarding of X11 connections, generates fake authentication | |
3157 | * data, and enables authentication spoofing. | |
8e7895b8 | 3158 | * This should be called in the client only. |
aa3378df | 3159 | */ |
6ae2364d | 3160 | void |
9bf083eb | 3161 | x11_request_forwarding_with_spoofing(int client_session_id, const char *disp, |
0b242b12 | 3162 | const char *proto, const char *data) |
8efc0c15 | 3163 | { |
1e3b8b07 | 3164 | u_int data_len = (u_int) strlen(data) / 2; |
ef07103c | 3165 | u_int i, value; |
5260325f | 3166 | char *new_data; |
3167 | int screen_number; | |
3168 | const char *cp; | |
ca75d7de | 3169 | u_int32_t rnd = 0; |
5260325f | 3170 | |
4297b666 | 3171 | if (x11_saved_display == NULL) |
3172 | x11_saved_display = xstrdup(disp); | |
3173 | else if (strcmp(disp, x11_saved_display) != 0) { | |
ef07103c | 3174 | error("x11_request_forwarding_with_spoofing: different " |
3175 | "$DISPLAY already forwarded"); | |
3176 | return; | |
3177 | } | |
3178 | ||
0875ae22 | 3179 | cp = strchr(disp, ':'); |
5260325f | 3180 | if (cp) |
3181 | cp = strchr(cp, '.'); | |
3182 | if (cp) | |
d6d4897e | 3183 | screen_number = (u_int)strtonum(cp + 1, 0, 400, NULL); |
5260325f | 3184 | else |
3185 | screen_number = 0; | |
3186 | ||
ef07103c | 3187 | if (x11_saved_proto == NULL) { |
3188 | /* Save protocol name. */ | |
3189 | x11_saved_proto = xstrdup(proto); | |
3190 | /* | |
56964485 | 3191 | * Extract real authentication data and generate fake data |
ef07103c | 3192 | * of the same length. |
3193 | */ | |
3194 | x11_saved_data = xmalloc(data_len); | |
3195 | x11_fake_data = xmalloc(data_len); | |
3196 | for (i = 0; i < data_len; i++) { | |
3197 | if (sscanf(data + 2 * i, "%2x", &value) != 1) | |
3198 | fatal("x11_request_forwarding: bad " | |
3199 | "authentication data: %.100s", data); | |
3200 | if (i % 4 == 0) | |
3201 | rnd = arc4random(); | |
3202 | x11_saved_data[i] = value; | |
3203 | x11_fake_data[i] = rnd & 0xff; | |
3204 | rnd >>= 8; | |
3205 | } | |
3206 | x11_saved_data_len = data_len; | |
3207 | x11_fake_data_len = data_len; | |
3208 | } | |
5260325f | 3209 | |
3210 | /* Convert the fake data into hex. */ | |
ef07103c | 3211 | new_data = tohex(x11_fake_data, data_len); |
5260325f | 3212 | |
3213 | /* Send the request packet. */ | |
0b242b12 | 3214 | if (compat20) { |
3215 | channel_request_start(client_session_id, "x11-req", 0); | |
3216 | packet_put_char(0); /* XXX bool single connection */ | |
3217 | } else { | |
3218 | packet_start(SSH_CMSG_X11_REQUEST_FORWARDING); | |
3219 | } | |
3220 | packet_put_cstring(proto); | |
3221 | packet_put_cstring(new_data); | |
5260325f | 3222 | packet_put_int(screen_number); |
3223 | packet_send(); | |
3224 | packet_write_wait(); | |
3225 | xfree(new_data); | |
8efc0c15 | 3226 | } |
3227 | ||
8e7895b8 | 3228 | |
3229 | /* -- agent forwarding */ | |
3230 | ||
8efc0c15 | 3231 | /* Sends a message to the server to request authentication fd forwarding. */ |
3232 | ||
6ae2364d | 3233 | void |
d5bb9418 | 3234 | auth_request_forwarding(void) |
8efc0c15 | 3235 | { |
5260325f | 3236 | packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING); |
3237 | packet_send(); | |
3238 | packet_write_wait(); | |
8efc0c15 | 3239 | } |