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dc1f1948 | 1 | /* $OpenBSD: channels.c,v 1.296 2009/05/25 06:48:00 andreas Exp $ */ |
8efc0c15 | 2 | /* |
5260325f | 3 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
5260325f | 4 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
5 | * All rights reserved | |
5260325f | 6 | * This file contains functions for generic socket connection forwarding. |
7 | * There is also code for initiating connection forwarding for X11 connections, | |
8 | * arbitrary tcp/ip connections, and the authentication agent connection. | |
6ae2364d | 9 | * |
bcbf86ec | 10 | * As far as I am concerned, the code I have written for this software |
11 | * can be used freely for any purpose. Any derived versions of this | |
12 | * software must be clearly marked as such, and if the derived work is | |
13 | * incompatible with the protocol description in the RFC file, it must be | |
14 | * called by a name other than "ssh" or "Secure Shell". | |
15 | * | |
7e7327a1 | 16 | * SSH2 support added by Markus Friedl. |
8341f420 | 17 | * Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved. |
bcbf86ec | 18 | * Copyright (c) 1999 Dug Song. All rights reserved. |
19 | * Copyright (c) 1999 Theo de Raadt. All rights reserved. | |
20 | * | |
21 | * Redistribution and use in source and binary forms, with or without | |
22 | * modification, are permitted provided that the following conditions | |
23 | * are met: | |
24 | * 1. Redistributions of source code must retain the above copyright | |
25 | * notice, this list of conditions and the following disclaimer. | |
26 | * 2. Redistributions in binary form must reproduce the above copyright | |
27 | * notice, this list of conditions and the following disclaimer in the | |
28 | * documentation and/or other materials provided with the distribution. | |
29 | * | |
30 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
31 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
32 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
33 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
34 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
35 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
36 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
37 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
38 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
39 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
5260325f | 40 | */ |
8efc0c15 | 41 | |
42 | #include "includes.h" | |
bd7c69ea | 43 | |
cebb4c24 | 44 | #include <sys/types.h> |
31652869 | 45 | #include <sys/ioctl.h> |
cebb4c24 | 46 | #include <sys/un.h> |
319d6b41 | 47 | #include <sys/socket.h> |
e264ac72 | 48 | #ifdef HAVE_SYS_TIME_H |
49 | # include <sys/time.h> | |
50 | #endif | |
319d6b41 | 51 | |
52 | #include <netinet/in.h> | |
53 | #include <arpa/inet.h> | |
1d3e026f | 54 | |
028094f4 | 55 | #include <errno.h> |
28cb0a43 | 56 | #include <netdb.h> |
cf851879 | 57 | #include <stdio.h> |
ffa517a8 | 58 | #include <stdlib.h> |
00146caa | 59 | #include <string.h> |
1d3e026f | 60 | #include <termios.h> |
5188ba17 | 61 | #include <unistd.h> |
31652869 | 62 | #include <stdarg.h> |
8efc0c15 | 63 | |
3593bdc0 | 64 | #include "openbsd-compat/sys-queue.h" |
31652869 | 65 | #include "xmalloc.h" |
8efc0c15 | 66 | #include "ssh.h" |
42f11eb2 | 67 | #include "ssh1.h" |
68 | #include "ssh2.h" | |
8efc0c15 | 69 | #include "packet.h" |
42f11eb2 | 70 | #include "log.h" |
71 | #include "misc.h" | |
31652869 | 72 | #include "buffer.h" |
8efc0c15 | 73 | #include "channels.h" |
8efc0c15 | 74 | #include "compat.h" |
42f11eb2 | 75 | #include "canohost.h" |
4c8722d9 | 76 | #include "key.h" |
77 | #include "authfd.h" | |
805e659f | 78 | #include "pathnames.h" |
8efc0c15 | 79 | |
8e7895b8 | 80 | /* -- channel core */ |
8efc0c15 | 81 | |
aa3378df | 82 | /* |
83 | * Pointer to an array containing all allocated channels. The array is | |
84 | * dynamically extended as needed. | |
85 | */ | |
719fc62f | 86 | static Channel **channels = NULL; |
8efc0c15 | 87 | |
aa3378df | 88 | /* |
89 | * Size of the channel array. All slots of the array must always be | |
719fc62f | 90 | * initialized (at least the type field); unused slots set to NULL |
aa3378df | 91 | */ |
9a995072 | 92 | static u_int channels_alloc = 0; |
8efc0c15 | 93 | |
aa3378df | 94 | /* |
95 | * Maximum file descriptor value used in any of the channels. This is | |
719fc62f | 96 | * updated in channel_new. |
aa3378df | 97 | */ |
39929cdb | 98 | static int channel_max_fd = 0; |
8efc0c15 | 99 | |
8efc0c15 | 100 | |
8e7895b8 | 101 | /* -- tcp forwarding */ |
8efc0c15 | 102 | |
aa3378df | 103 | /* |
104 | * Data structure for storing which hosts are permitted for forward requests. | |
105 | * The local sides of any remote forwards are stored in this array to prevent | |
106 | * a corrupt remote server from accessing arbitrary TCP/IP ports on our local | |
107 | * network (which might be behind a firewall). | |
108 | */ | |
5260325f | 109 | typedef struct { |
7368a6c8 | 110 | char *host_to_connect; /* Connect to 'host'. */ |
111 | u_short port_to_connect; /* Connect to 'port'. */ | |
112 | u_short listen_port; /* Remote side should listen port number. */ | |
8efc0c15 | 113 | } ForwardPermission; |
114 | ||
2fefbadf | 115 | /* List of all permitted host/port pairs to connect by the user. */ |
8efc0c15 | 116 | static ForwardPermission permitted_opens[SSH_MAX_FORWARDS_PER_DIRECTION]; |
8e7895b8 | 117 | |
2fefbadf | 118 | /* List of all permitted host/port pairs to connect by the admin. */ |
119 | static ForwardPermission permitted_adm_opens[SSH_MAX_FORWARDS_PER_DIRECTION]; | |
120 | ||
121 | /* Number of permitted host/port pairs in the array permitted by the user. */ | |
8efc0c15 | 122 | static int num_permitted_opens = 0; |
2fefbadf | 123 | |
124 | /* Number of permitted host/port pair in the array permitted by the admin. */ | |
125 | static int num_adm_permitted_opens = 0; | |
126 | ||
aa3378df | 127 | /* |
128 | * If this is true, all opens are permitted. This is the case on the server | |
129 | * on which we have to trust the client anyway, and the user could do | |
130 | * anything after logging in anyway. | |
131 | */ | |
8efc0c15 | 132 | static int all_opens_permitted = 0; |
133 | ||
8efc0c15 | 134 | |
8e7895b8 | 135 | /* -- X11 forwarding */ |
42f11eb2 | 136 | |
8e7895b8 | 137 | /* Maximum number of fake X11 displays to try. */ |
138 | #define MAX_DISPLAYS 1000 | |
0490e609 | 139 | |
ef07103c | 140 | /* Saved X11 local (client) display. */ |
141 | static char *x11_saved_display = NULL; | |
142 | ||
8e7895b8 | 143 | /* Saved X11 authentication protocol name. */ |
144 | static char *x11_saved_proto = NULL; | |
8efc0c15 | 145 | |
8e7895b8 | 146 | /* Saved X11 authentication data. This is the real data. */ |
147 | static char *x11_saved_data = NULL; | |
148 | static u_int x11_saved_data_len = 0; | |
149 | ||
150 | /* | |
151 | * Fake X11 authentication data. This is what the server will be sending us; | |
152 | * we should replace any occurrences of this by the real data. | |
153 | */ | |
338eb2ab | 154 | static u_char *x11_fake_data = NULL; |
8e7895b8 | 155 | static u_int x11_fake_data_len; |
156 | ||
157 | ||
158 | /* -- agent forwarding */ | |
8efc0c15 | 159 | |
8e7895b8 | 160 | #define NUM_SOCKS 10 |
161 | ||
8e7895b8 | 162 | /* AF_UNSPEC or AF_INET or AF_INET6 */ |
5e4a7219 | 163 | static int IPv4or6 = AF_UNSPEC; |
8e7895b8 | 164 | |
165 | /* helper */ | |
396c147e | 166 | static void port_open_helper(Channel *c, char *rtype); |
8e7895b8 | 167 | |
e07e21ad | 168 | /* non-blocking connect helpers */ |
169 | static int connect_next(struct channel_connect *); | |
170 | static void channel_connect_ctx_free(struct channel_connect *); | |
171 | ||
8e7895b8 | 172 | /* -- channel core */ |
7368a6c8 | 173 | |
174 | Channel * | |
b872f7f0 | 175 | channel_by_id(int id) |
7368a6c8 | 176 | { |
177 | Channel *c; | |
719fc62f | 178 | |
9a995072 | 179 | if (id < 0 || (u_int)id >= channels_alloc) { |
b872f7f0 | 180 | logit("channel_by_id: %d: bad id", id); |
7368a6c8 | 181 | return NULL; |
182 | } | |
719fc62f | 183 | c = channels[id]; |
184 | if (c == NULL) { | |
b872f7f0 | 185 | logit("channel_by_id: %d: bad id: channel free", id); |
7368a6c8 | 186 | return NULL; |
187 | } | |
188 | return c; | |
189 | } | |
190 | ||
b872f7f0 | 191 | /* |
192 | * Returns the channel if it is allowed to receive protocol messages. | |
193 | * Private channels, like listening sockets, may not receive messages. | |
194 | */ | |
195 | Channel * | |
196 | channel_lookup(int id) | |
197 | { | |
198 | Channel *c; | |
199 | ||
200 | if ((c = channel_by_id(id)) == NULL) | |
201 | return (NULL); | |
202 | ||
c8e9c167 | 203 | switch (c->type) { |
b872f7f0 | 204 | case SSH_CHANNEL_X11_OPEN: |
205 | case SSH_CHANNEL_LARVAL: | |
206 | case SSH_CHANNEL_CONNECTING: | |
207 | case SSH_CHANNEL_DYNAMIC: | |
208 | case SSH_CHANNEL_OPENING: | |
209 | case SSH_CHANNEL_OPEN: | |
210 | case SSH_CHANNEL_INPUT_DRAINING: | |
211 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
212 | return (c); | |
b872f7f0 | 213 | } |
214 | logit("Non-public channel %d, type %d.", id, c->type); | |
215 | return (NULL); | |
216 | } | |
217 | ||
aa3378df | 218 | /* |
1d1ffb87 | 219 | * Register filedescriptors for a channel, used when allocating a channel or |
0fbe8c74 | 220 | * when the channel consumer/producer is ready, e.g. shell exec'd |
aa3378df | 221 | */ |
396c147e | 222 | static void |
a22aff1f | 223 | channel_register_fds(Channel *c, int rfd, int wfd, int efd, |
b3784859 | 224 | int extusage, int nonblock, int is_tty) |
8efc0c15 | 225 | { |
5260325f | 226 | /* Update the maximum file descriptor value. */ |
39929cdb | 227 | channel_max_fd = MAX(channel_max_fd, rfd); |
228 | channel_max_fd = MAX(channel_max_fd, wfd); | |
229 | channel_max_fd = MAX(channel_max_fd, efd); | |
230 | ||
aa3378df | 231 | /* XXX set close-on-exec -markus */ |
1d1ffb87 | 232 | |
0fbe8c74 | 233 | c->rfd = rfd; |
234 | c->wfd = wfd; | |
235 | c->sock = (rfd == wfd) ? rfd : -1; | |
5e96b616 | 236 | c->ctl_fd = -1; /* XXX: set elsewhere */ |
0fbe8c74 | 237 | c->efd = efd; |
238 | c->extended_usage = extusage; | |
a22aff1f | 239 | |
b3784859 | 240 | if ((c->isatty = is_tty) != 0) |
d7ac5f18 | 241 | debug2("channel %d: rfd %d isatty", c->self, c->rfd); |
245f4d36 | 242 | c->wfd_isatty = is_tty || isatty(c->wfd); |
0ae4fe1d | 243 | |
a22aff1f | 244 | /* enable nonblocking mode */ |
245 | if (nonblock) { | |
246 | if (rfd != -1) | |
247 | set_nonblock(rfd); | |
248 | if (wfd != -1) | |
249 | set_nonblock(wfd); | |
250 | if (efd != -1) | |
251 | set_nonblock(efd); | |
252 | } | |
0fbe8c74 | 253 | } |
254 | ||
255 | /* | |
256 | * Allocate a new channel object and set its type and socket. This will cause | |
257 | * remote_name to be freed. | |
258 | */ | |
719fc62f | 259 | Channel * |
0fbe8c74 | 260 | channel_new(char *ctype, int type, int rfd, int wfd, int efd, |
f91d9a89 | 261 | u_int window, u_int maxpack, int extusage, char *remote_name, int nonblock) |
0fbe8c74 | 262 | { |
9a995072 | 263 | int found; |
264 | u_int i; | |
0fbe8c74 | 265 | Channel *c; |
5260325f | 266 | |
267 | /* Do initial allocation if this is the first call. */ | |
268 | if (channels_alloc == 0) { | |
269 | channels_alloc = 10; | |
52e3daed | 270 | channels = xcalloc(channels_alloc, sizeof(Channel *)); |
5260325f | 271 | for (i = 0; i < channels_alloc; i++) |
719fc62f | 272 | channels[i] = NULL; |
5260325f | 273 | } |
274 | /* Try to find a free slot where to put the new channel. */ | |
275 | for (found = -1, i = 0; i < channels_alloc; i++) | |
719fc62f | 276 | if (channels[i] == NULL) { |
5260325f | 277 | /* Found a free slot. */ |
9a995072 | 278 | found = (int)i; |
5260325f | 279 | break; |
280 | } | |
9a995072 | 281 | if (found < 0) { |
aa3378df | 282 | /* There are no free slots. Take last+1 slot and expand the array. */ |
5260325f | 283 | found = channels_alloc; |
5df8c731 | 284 | if (channels_alloc > 10000) |
285 | fatal("channel_new: internal error: channels_alloc %d " | |
286 | "too big.", channels_alloc); | |
c5d10563 | 287 | channels = xrealloc(channels, channels_alloc + 10, |
288 | sizeof(Channel *)); | |
20419cc1 | 289 | channels_alloc += 10; |
de273eef | 290 | debug2("channel: expanding %d", channels_alloc); |
5260325f | 291 | for (i = found; i < channels_alloc; i++) |
719fc62f | 292 | channels[i] = NULL; |
5260325f | 293 | } |
719fc62f | 294 | /* Initialize and return new channel. */ |
52e3daed | 295 | c = channels[found] = xcalloc(1, sizeof(Channel)); |
5260325f | 296 | buffer_init(&c->input); |
297 | buffer_init(&c->output); | |
7368a6c8 | 298 | buffer_init(&c->extended); |
1338ba77 | 299 | c->path = NULL; |
70bef40e | 300 | c->ostate = CHAN_OUTPUT_OPEN; |
301 | c->istate = CHAN_INPUT_OPEN; | |
302 | c->flags = 0; | |
c9478090 | 303 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock, 0); |
5260325f | 304 | c->self = found; |
305 | c->type = type; | |
7368a6c8 | 306 | c->ctype = ctype; |
0b242b12 | 307 | c->local_window = window; |
308 | c->local_window_max = window; | |
309 | c->local_consumed = 0; | |
310 | c->local_maxpacket = maxpack; | |
5260325f | 311 | c->remote_id = -1; |
0d942eff | 312 | c->remote_name = xstrdup(remote_name); |
7368a6c8 | 313 | c->remote_window = 0; |
314 | c->remote_maxpacket = 0; | |
a5f82435 | 315 | c->force_drain = 0; |
ac151b18 | 316 | c->single_connection = 0; |
3cf2be58 | 317 | c->detach_user = NULL; |
8cd0437d | 318 | c->detach_close = 0; |
3593bdc0 | 319 | c->open_confirm = NULL; |
320 | c->open_confirm_ctx = NULL; | |
2e73a022 | 321 | c->input_filter = NULL; |
c1c6a032 | 322 | c->output_filter = NULL; |
e74caf1e | 323 | c->filter_ctx = NULL; |
324 | c->filter_cleanup = NULL; | |
3593bdc0 | 325 | TAILQ_INIT(&c->status_confirms); |
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; |
3593bdc0 | 382 | struct channel_confirm *cc; |
8e7895b8 | 383 | |
384 | for (n = 0, i = 0; i < channels_alloc; i++) | |
385 | if (channels[i]) | |
386 | n++; | |
9a995072 | 387 | debug("channel %d: free: %s, nchannels %u", c->self, |
8e7895b8 | 388 | c->remote_name ? c->remote_name : "???", n); |
389 | ||
390 | s = channel_open_message(); | |
d7ac5f18 | 391 | debug3("channel %d: status: %s", c->self, s); |
8e7895b8 | 392 | xfree(s); |
393 | ||
8e7895b8 | 394 | if (c->sock != -1) |
395 | shutdown(c->sock, SHUT_RDWR); | |
5e96b616 | 396 | if (c->ctl_fd != -1) |
397 | shutdown(c->ctl_fd, SHUT_RDWR); | |
8e7895b8 | 398 | channel_close_fds(c); |
399 | buffer_free(&c->input); | |
400 | buffer_free(&c->output); | |
401 | buffer_free(&c->extended); | |
402 | if (c->remote_name) { | |
403 | xfree(c->remote_name); | |
404 | c->remote_name = NULL; | |
405 | } | |
1338ba77 | 406 | if (c->path) { |
407 | xfree(c->path); | |
408 | c->path = NULL; | |
409 | } | |
3593bdc0 | 410 | while ((cc = TAILQ_FIRST(&c->status_confirms)) != NULL) { |
411 | if (cc->abandon_cb != NULL) | |
412 | cc->abandon_cb(c, cc->ctx); | |
413 | TAILQ_REMOVE(&c->status_confirms, cc, entry); | |
414 | bzero(cc, sizeof(*cc)); | |
415 | xfree(cc); | |
416 | } | |
e74caf1e | 417 | if (c->filter_cleanup != NULL && c->filter_ctx != NULL) |
418 | c->filter_cleanup(c->self, c->filter_ctx); | |
8e7895b8 | 419 | channels[c->self] = NULL; |
420 | xfree(c); | |
421 | } | |
422 | ||
8e7895b8 | 423 | void |
d6746a0b | 424 | channel_free_all(void) |
8e7895b8 | 425 | { |
9a995072 | 426 | u_int i; |
8e7895b8 | 427 | |
d6746a0b | 428 | for (i = 0; i < channels_alloc; i++) |
429 | if (channels[i] != NULL) | |
430 | channel_free(channels[i]); | |
8e7895b8 | 431 | } |
432 | ||
433 | /* | |
434 | * Closes the sockets/fds of all channels. This is used to close extra file | |
435 | * descriptors after a fork. | |
436 | */ | |
8e7895b8 | 437 | void |
d5bb9418 | 438 | channel_close_all(void) |
8e7895b8 | 439 | { |
9a995072 | 440 | u_int i; |
8e7895b8 | 441 | |
442 | for (i = 0; i < channels_alloc; i++) | |
443 | if (channels[i] != NULL) | |
444 | channel_close_fds(channels[i]); | |
445 | } | |
446 | ||
3cf2be58 | 447 | /* |
448 | * Stop listening to channels. | |
449 | */ | |
3cf2be58 | 450 | void |
451 | channel_stop_listening(void) | |
452 | { | |
9a995072 | 453 | u_int i; |
3cf2be58 | 454 | Channel *c; |
455 | ||
456 | for (i = 0; i < channels_alloc; i++) { | |
457 | c = channels[i]; | |
458 | if (c != NULL) { | |
459 | switch (c->type) { | |
460 | case SSH_CHANNEL_AUTH_SOCKET: | |
461 | case SSH_CHANNEL_PORT_LISTENER: | |
462 | case SSH_CHANNEL_RPORT_LISTENER: | |
463 | case SSH_CHANNEL_X11_LISTENER: | |
489aa2e9 | 464 | channel_close_fd(&c->sock); |
3cf2be58 | 465 | channel_free(c); |
466 | break; | |
467 | } | |
468 | } | |
469 | } | |
470 | } | |
471 | ||
8e7895b8 | 472 | /* |
473 | * Returns true if no channel has too much buffered data, and false if one or | |
474 | * more channel is overfull. | |
475 | */ | |
8e7895b8 | 476 | int |
d5bb9418 | 477 | channel_not_very_much_buffered_data(void) |
8e7895b8 | 478 | { |
479 | u_int i; | |
480 | Channel *c; | |
481 | ||
482 | for (i = 0; i < channels_alloc; i++) { | |
483 | c = channels[i]; | |
484 | if (c != NULL && c->type == SSH_CHANNEL_OPEN) { | |
0c139bd1 | 485 | #if 0 |
486 | if (!compat20 && | |
487 | buffer_len(&c->input) > packet_get_maxsize()) { | |
faa483fa | 488 | debug2("channel %d: big input buffer %d", |
8e7895b8 | 489 | c->self, buffer_len(&c->input)); |
490 | return 0; | |
491 | } | |
0c139bd1 | 492 | #endif |
8e7895b8 | 493 | if (buffer_len(&c->output) > packet_get_maxsize()) { |
a27002e5 | 494 | debug2("channel %d: big output buffer %u > %u", |
0c139bd1 | 495 | c->self, buffer_len(&c->output), |
496 | packet_get_maxsize()); | |
8e7895b8 | 497 | return 0; |
498 | } | |
499 | } | |
500 | } | |
501 | return 1; | |
502 | } | |
503 | ||
504 | /* Returns true if any channel is still open. */ | |
8e7895b8 | 505 | int |
d5bb9418 | 506 | channel_still_open(void) |
8e7895b8 | 507 | { |
9a995072 | 508 | u_int i; |
8e7895b8 | 509 | Channel *c; |
510 | ||
511 | for (i = 0; i < channels_alloc; i++) { | |
512 | c = channels[i]; | |
513 | if (c == NULL) | |
514 | continue; | |
515 | switch (c->type) { | |
516 | case SSH_CHANNEL_X11_LISTENER: | |
517 | case SSH_CHANNEL_PORT_LISTENER: | |
518 | case SSH_CHANNEL_RPORT_LISTENER: | |
519 | case SSH_CHANNEL_CLOSED: | |
520 | case SSH_CHANNEL_AUTH_SOCKET: | |
521 | case SSH_CHANNEL_DYNAMIC: | |
522 | case SSH_CHANNEL_CONNECTING: | |
523 | case SSH_CHANNEL_ZOMBIE: | |
524 | continue; | |
525 | case SSH_CHANNEL_LARVAL: | |
526 | if (!compat20) | |
527 | fatal("cannot happen: SSH_CHANNEL_LARVAL"); | |
528 | continue; | |
529 | case SSH_CHANNEL_OPENING: | |
530 | case SSH_CHANNEL_OPEN: | |
531 | case SSH_CHANNEL_X11_OPEN: | |
532 | return 1; | |
533 | case SSH_CHANNEL_INPUT_DRAINING: | |
534 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
535 | if (!compat13) | |
536 | fatal("cannot happen: OUT_DRAIN"); | |
537 | return 1; | |
538 | default: | |
539 | fatal("channel_still_open: bad channel type %d", c->type); | |
540 | /* NOTREACHED */ | |
541 | } | |
542 | } | |
543 | return 0; | |
544 | } | |
545 | ||
546 | /* Returns the id of an open channel suitable for keepaliving */ | |
8e7895b8 | 547 | int |
d5bb9418 | 548 | channel_find_open(void) |
8e7895b8 | 549 | { |
9a995072 | 550 | u_int i; |
8e7895b8 | 551 | Channel *c; |
552 | ||
553 | for (i = 0; i < channels_alloc; i++) { | |
554 | c = channels[i]; | |
13de3560 | 555 | if (c == NULL || c->remote_id < 0) |
8e7895b8 | 556 | continue; |
557 | switch (c->type) { | |
558 | case SSH_CHANNEL_CLOSED: | |
559 | case SSH_CHANNEL_DYNAMIC: | |
560 | case SSH_CHANNEL_X11_LISTENER: | |
561 | case SSH_CHANNEL_PORT_LISTENER: | |
562 | case SSH_CHANNEL_RPORT_LISTENER: | |
563 | case SSH_CHANNEL_OPENING: | |
564 | case SSH_CHANNEL_CONNECTING: | |
565 | case SSH_CHANNEL_ZOMBIE: | |
566 | continue; | |
567 | case SSH_CHANNEL_LARVAL: | |
568 | case SSH_CHANNEL_AUTH_SOCKET: | |
569 | case SSH_CHANNEL_OPEN: | |
570 | case SSH_CHANNEL_X11_OPEN: | |
571 | return i; | |
572 | case SSH_CHANNEL_INPUT_DRAINING: | |
573 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
574 | if (!compat13) | |
575 | fatal("cannot happen: OUT_DRAIN"); | |
576 | return i; | |
577 | default: | |
578 | fatal("channel_find_open: bad channel type %d", c->type); | |
579 | /* NOTREACHED */ | |
580 | } | |
581 | } | |
582 | return -1; | |
583 | } | |
584 | ||
585 | ||
586 | /* | |
587 | * Returns a message describing the currently open forwarded connections, | |
588 | * suitable for sending to the client. The message contains crlf pairs for | |
589 | * newlines. | |
590 | */ | |
8e7895b8 | 591 | char * |
d5bb9418 | 592 | channel_open_message(void) |
8e7895b8 | 593 | { |
594 | Buffer buffer; | |
595 | Channel *c; | |
596 | char buf[1024], *cp; | |
9a995072 | 597 | u_int i; |
8e7895b8 | 598 | |
599 | buffer_init(&buffer); | |
600 | snprintf(buf, sizeof buf, "The following connections are open:\r\n"); | |
601 | buffer_append(&buffer, buf, strlen(buf)); | |
602 | for (i = 0; i < channels_alloc; i++) { | |
603 | c = channels[i]; | |
604 | if (c == NULL) | |
605 | continue; | |
606 | switch (c->type) { | |
607 | case SSH_CHANNEL_X11_LISTENER: | |
608 | case SSH_CHANNEL_PORT_LISTENER: | |
609 | case SSH_CHANNEL_RPORT_LISTENER: | |
610 | case SSH_CHANNEL_CLOSED: | |
611 | case SSH_CHANNEL_AUTH_SOCKET: | |
612 | case SSH_CHANNEL_ZOMBIE: | |
613 | continue; | |
614 | case SSH_CHANNEL_LARVAL: | |
615 | case SSH_CHANNEL_OPENING: | |
616 | case SSH_CHANNEL_CONNECTING: | |
617 | case SSH_CHANNEL_DYNAMIC: | |
618 | case SSH_CHANNEL_OPEN: | |
619 | case SSH_CHANNEL_X11_OPEN: | |
620 | case SSH_CHANNEL_INPUT_DRAINING: | |
621 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
5e96b616 | 622 | snprintf(buf, sizeof buf, |
623 | " #%d %.300s (t%d r%d i%d/%d o%d/%d fd %d/%d cfd %d)\r\n", | |
8e7895b8 | 624 | c->self, c->remote_name, |
625 | c->type, c->remote_id, | |
626 | c->istate, buffer_len(&c->input), | |
627 | c->ostate, buffer_len(&c->output), | |
5e96b616 | 628 | c->rfd, c->wfd, c->ctl_fd); |
8e7895b8 | 629 | buffer_append(&buffer, buf, strlen(buf)); |
630 | continue; | |
631 | default: | |
632 | fatal("channel_open_message: bad channel type %d", c->type); | |
633 | /* NOTREACHED */ | |
634 | } | |
635 | } | |
636 | buffer_append(&buffer, "\0", 1); | |
637 | cp = xstrdup(buffer_ptr(&buffer)); | |
638 | buffer_free(&buffer); | |
639 | return cp; | |
640 | } | |
641 | ||
642 | void | |
643 | channel_send_open(int id) | |
644 | { | |
645 | Channel *c = channel_lookup(id); | |
e1feb9bf | 646 | |
8e7895b8 | 647 | if (c == NULL) { |
bbe88b6d | 648 | logit("channel_send_open: %d: bad id", id); |
8e7895b8 | 649 | return; |
650 | } | |
6226a8f8 | 651 | debug2("channel %d: send open", id); |
8e7895b8 | 652 | packet_start(SSH2_MSG_CHANNEL_OPEN); |
653 | packet_put_cstring(c->ctype); | |
654 | packet_put_int(c->self); | |
655 | packet_put_int(c->local_window); | |
656 | packet_put_int(c->local_maxpacket); | |
657 | packet_send(); | |
658 | } | |
659 | ||
660 | void | |
6226a8f8 | 661 | channel_request_start(int id, char *service, int wantconfirm) |
8e7895b8 | 662 | { |
6226a8f8 | 663 | Channel *c = channel_lookup(id); |
e1feb9bf | 664 | |
8e7895b8 | 665 | if (c == NULL) { |
bbe88b6d | 666 | logit("channel_request_start: %d: unknown channel id", id); |
8e7895b8 | 667 | return; |
668 | } | |
5e96b616 | 669 | debug2("channel %d: request %s confirm %d", id, service, wantconfirm); |
8e7895b8 | 670 | packet_start(SSH2_MSG_CHANNEL_REQUEST); |
671 | packet_put_int(c->remote_id); | |
672 | packet_put_cstring(service); | |
673 | packet_put_char(wantconfirm); | |
674 | } | |
a7137f6b | 675 | |
8e7895b8 | 676 | void |
3593bdc0 | 677 | channel_register_status_confirm(int id, channel_confirm_cb *cb, |
678 | channel_confirm_abandon_cb *abandon_cb, void *ctx) | |
679 | { | |
680 | struct channel_confirm *cc; | |
681 | Channel *c; | |
682 | ||
683 | if ((c = channel_lookup(id)) == NULL) | |
684 | fatal("channel_register_expect: %d: bad id", id); | |
685 | ||
686 | cc = xmalloc(sizeof(*cc)); | |
687 | cc->cb = cb; | |
688 | cc->abandon_cb = abandon_cb; | |
689 | cc->ctx = ctx; | |
690 | TAILQ_INSERT_TAIL(&c->status_confirms, cc, entry); | |
691 | } | |
692 | ||
693 | void | |
694 | channel_register_open_confirm(int id, channel_callback_fn *fn, void *ctx) | |
8e7895b8 | 695 | { |
696 | Channel *c = channel_lookup(id); | |
e1feb9bf | 697 | |
8e7895b8 | 698 | if (c == NULL) { |
2ea438c2 | 699 | logit("channel_register_open_confirm: %d: bad id", id); |
8e7895b8 | 700 | return; |
701 | } | |
3593bdc0 | 702 | c->open_confirm = fn; |
703 | c->open_confirm_ctx = ctx; | |
8e7895b8 | 704 | } |
a7137f6b | 705 | |
8e7895b8 | 706 | void |
8cd0437d | 707 | channel_register_cleanup(int id, channel_callback_fn *fn, int do_close) |
8e7895b8 | 708 | { |
b872f7f0 | 709 | Channel *c = channel_by_id(id); |
e1feb9bf | 710 | |
8e7895b8 | 711 | if (c == NULL) { |
bbe88b6d | 712 | logit("channel_register_cleanup: %d: bad id", id); |
8e7895b8 | 713 | return; |
714 | } | |
3cf2be58 | 715 | c->detach_user = fn; |
8cd0437d | 716 | c->detach_close = do_close; |
8e7895b8 | 717 | } |
a7137f6b | 718 | |
8e7895b8 | 719 | void |
720 | channel_cancel_cleanup(int id) | |
721 | { | |
b872f7f0 | 722 | Channel *c = channel_by_id(id); |
e1feb9bf | 723 | |
8e7895b8 | 724 | if (c == NULL) { |
bbe88b6d | 725 | logit("channel_cancel_cleanup: %d: bad id", id); |
8e7895b8 | 726 | return; |
727 | } | |
3cf2be58 | 728 | c->detach_user = NULL; |
8cd0437d | 729 | c->detach_close = 0; |
8e7895b8 | 730 | } |
a7137f6b | 731 | |
8e7895b8 | 732 | void |
c1c6a032 | 733 | channel_register_filter(int id, channel_infilter_fn *ifn, |
e74caf1e | 734 | channel_outfilter_fn *ofn, channel_filter_cleanup_fn *cfn, void *ctx) |
8e7895b8 | 735 | { |
736 | Channel *c = channel_lookup(id); | |
e1feb9bf | 737 | |
8e7895b8 | 738 | if (c == NULL) { |
bbe88b6d | 739 | logit("channel_register_filter: %d: bad id", id); |
8e7895b8 | 740 | return; |
741 | } | |
c1c6a032 | 742 | c->input_filter = ifn; |
743 | c->output_filter = ofn; | |
f17f705b | 744 | c->filter_ctx = ctx; |
e74caf1e | 745 | c->filter_cleanup = cfn; |
8e7895b8 | 746 | } |
747 | ||
6ae2364d | 748 | void |
8e7895b8 | 749 | channel_set_fds(int id, int rfd, int wfd, int efd, |
b3784859 | 750 | int extusage, int nonblock, int is_tty, u_int window_max) |
8efc0c15 | 751 | { |
8e7895b8 | 752 | Channel *c = channel_lookup(id); |
e1feb9bf | 753 | |
8e7895b8 | 754 | if (c == NULL || c->type != SSH_CHANNEL_LARVAL) |
755 | fatal("channel_activate for non-larval channel %d.", id); | |
b3784859 | 756 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock, is_tty); |
8e7895b8 | 757 | c->type = SSH_CHANNEL_OPEN; |
399d1ea6 | 758 | c->local_window = c->local_window_max = window_max; |
8e7895b8 | 759 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
760 | packet_put_int(c->remote_id); | |
761 | packet_put_int(c->local_window); | |
762 | packet_send(); | |
8efc0c15 | 763 | } |
764 | ||
aa3378df | 765 | /* |
7368a6c8 | 766 | * 'channel_pre*' are called just before select() to add any bits relevant to |
767 | * channels in the select bitmasks. | |
aa3378df | 768 | */ |
7368a6c8 | 769 | /* |
770 | * 'channel_post*': perform any appropriate operations for channels which | |
771 | * have events pending. | |
772 | */ | |
c8e9c167 | 773 | typedef void chan_fn(Channel *c, fd_set *readset, fd_set *writeset); |
7368a6c8 | 774 | chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE]; |
775 | chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE]; | |
8efc0c15 | 776 | |
ebb90778 | 777 | /* ARGSUSED */ |
396c147e | 778 | static void |
c8e9c167 | 779 | channel_pre_listener(Channel *c, fd_set *readset, fd_set *writeset) |
8efc0c15 | 780 | { |
7368a6c8 | 781 | FD_SET(c->sock, readset); |
782 | } | |
5260325f | 783 | |
ebb90778 | 784 | /* ARGSUSED */ |
396c147e | 785 | static void |
c8e9c167 | 786 | channel_pre_connecting(Channel *c, fd_set *readset, fd_set *writeset) |
97fb6912 | 787 | { |
788 | debug3("channel %d: waiting for connection", c->self); | |
789 | FD_SET(c->sock, writeset); | |
790 | } | |
791 | ||
396c147e | 792 | static void |
c8e9c167 | 793 | channel_pre_open_13(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 794 | { |
795 | if (buffer_len(&c->input) < packet_get_maxsize()) | |
796 | FD_SET(c->sock, readset); | |
797 | if (buffer_len(&c->output) > 0) | |
798 | FD_SET(c->sock, writeset); | |
799 | } | |
5260325f | 800 | |
396c147e | 801 | static void |
c8e9c167 | 802 | channel_pre_open(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 803 | { |
0c0738d5 | 804 | u_int limit = compat20 ? c->remote_window : packet_get_maxsize(); |
5260325f | 805 | |
7e7327a1 | 806 | if (c->istate == CHAN_INPUT_OPEN && |
0c0738d5 | 807 | limit > 0 && |
69d9d413 | 808 | buffer_len(&c->input) < limit && |
809 | buffer_check_alloc(&c->input, CHAN_RBUF)) | |
7e7327a1 | 810 | FD_SET(c->rfd, readset); |
811 | if (c->ostate == CHAN_OUTPUT_OPEN || | |
812 | c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { | |
813 | if (buffer_len(&c->output) > 0) { | |
814 | FD_SET(c->wfd, writeset); | |
815 | } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { | |
d2296ed7 | 816 | if (CHANNEL_EFD_OUTPUT_ACTIVE(c)) |
4e2e5cfd | 817 | debug2("channel %d: obuf_empty delayed efd %d/(%d)", |
818 | c->self, c->efd, buffer_len(&c->extended)); | |
d2296ed7 | 819 | else |
820 | chan_obuf_empty(c); | |
7e7327a1 | 821 | } |
822 | } | |
823 | /** XXX check close conditions, too */ | |
271f4a13 | 824 | if (compat20 && c->efd != -1 && |
825 | !(c->istate == CHAN_INPUT_CLOSED && c->ostate == CHAN_OUTPUT_CLOSED)) { | |
7e7327a1 | 826 | if (c->extended_usage == CHAN_EXTENDED_WRITE && |
827 | buffer_len(&c->extended) > 0) | |
828 | FD_SET(c->efd, writeset); | |
d2296ed7 | 829 | else if (!(c->flags & CHAN_EOF_SENT) && |
830 | c->extended_usage == CHAN_EXTENDED_READ && | |
7e7327a1 | 831 | buffer_len(&c->extended) < c->remote_window) |
832 | FD_SET(c->efd, readset); | |
833 | } | |
5e96b616 | 834 | /* XXX: What about efd? races? */ |
f2107e97 | 835 | if (compat20 && c->ctl_fd != -1 && |
5e96b616 | 836 | c->istate == CHAN_INPUT_OPEN && c->ostate == CHAN_OUTPUT_OPEN) |
837 | FD_SET(c->ctl_fd, readset); | |
7e7327a1 | 838 | } |
839 | ||
ebb90778 | 840 | /* ARGSUSED */ |
396c147e | 841 | static void |
c8e9c167 | 842 | channel_pre_input_draining(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 843 | { |
844 | if (buffer_len(&c->input) == 0) { | |
845 | packet_start(SSH_MSG_CHANNEL_CLOSE); | |
846 | packet_put_int(c->remote_id); | |
847 | packet_send(); | |
848 | c->type = SSH_CHANNEL_CLOSED; | |
d7ac5f18 | 849 | debug2("channel %d: closing after input drain.", c->self); |
7368a6c8 | 850 | } |
851 | } | |
5260325f | 852 | |
ebb90778 | 853 | /* ARGSUSED */ |
396c147e | 854 | static void |
c8e9c167 | 855 | channel_pre_output_draining(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 856 | { |
857 | if (buffer_len(&c->output) == 0) | |
719fc62f | 858 | chan_mark_dead(c); |
6ae2364d | 859 | else |
7368a6c8 | 860 | FD_SET(c->sock, writeset); |
861 | } | |
5260325f | 862 | |
7368a6c8 | 863 | /* |
864 | * This is a special state for X11 authentication spoofing. An opened X11 | |
865 | * connection (when authentication spoofing is being done) remains in this | |
866 | * state until the first packet has been completely read. The authentication | |
867 | * data in that packet is then substituted by the real data if it matches the | |
868 | * fake data, and the channel is put into normal mode. | |
0b242b12 | 869 | * XXX All this happens at the client side. |
8e7895b8 | 870 | * Returns: 0 = need more data, -1 = wrong cookie, 1 = ok |
7368a6c8 | 871 | */ |
396c147e | 872 | static int |
8e7895b8 | 873 | x11_open_helper(Buffer *b) |
7368a6c8 | 874 | { |
1e3b8b07 | 875 | u_char *ucp; |
876 | u_int proto_len, data_len; | |
5260325f | 877 | |
7368a6c8 | 878 | /* Check if the fixed size part of the packet is in buffer. */ |
8e7895b8 | 879 | if (buffer_len(b) < 12) |
7368a6c8 | 880 | return 0; |
881 | ||
882 | /* Parse the lengths of variable-length fields. */ | |
20905a8e | 883 | ucp = buffer_ptr(b); |
7368a6c8 | 884 | if (ucp[0] == 0x42) { /* Byte order MSB first. */ |
885 | proto_len = 256 * ucp[6] + ucp[7]; | |
886 | data_len = 256 * ucp[8] + ucp[9]; | |
887 | } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */ | |
888 | proto_len = ucp[6] + 256 * ucp[7]; | |
889 | data_len = ucp[8] + 256 * ucp[9]; | |
890 | } else { | |
d7ac5f18 | 891 | debug2("Initial X11 packet contains bad byte order byte: 0x%x", |
184eed6a | 892 | ucp[0]); |
7368a6c8 | 893 | return -1; |
894 | } | |
5260325f | 895 | |
7368a6c8 | 896 | /* Check if the whole packet is in buffer. */ |
8e7895b8 | 897 | if (buffer_len(b) < |
7368a6c8 | 898 | 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3)) |
899 | return 0; | |
5260325f | 900 | |
7368a6c8 | 901 | /* Check if authentication protocol matches. */ |
902 | if (proto_len != strlen(x11_saved_proto) || | |
903 | memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) { | |
d7ac5f18 | 904 | debug2("X11 connection uses different authentication protocol."); |
7368a6c8 | 905 | return -1; |
906 | } | |
907 | /* Check if authentication data matches our fake data. */ | |
908 | if (data_len != x11_fake_data_len || | |
909 | memcmp(ucp + 12 + ((proto_len + 3) & ~3), | |
910 | x11_fake_data, x11_fake_data_len) != 0) { | |
d7ac5f18 | 911 | debug2("X11 auth data does not match fake data."); |
7368a6c8 | 912 | return -1; |
913 | } | |
914 | /* Check fake data length */ | |
915 | if (x11_fake_data_len != x11_saved_data_len) { | |
916 | error("X11 fake_data_len %d != saved_data_len %d", | |
917 | x11_fake_data_len, x11_saved_data_len); | |
918 | return -1; | |
919 | } | |
920 | /* | |
921 | * Received authentication protocol and data match | |
922 | * our fake data. Substitute the fake data with real | |
923 | * data. | |
924 | */ | |
925 | memcpy(ucp + 12 + ((proto_len + 3) & ~3), | |
926 | x11_saved_data, x11_saved_data_len); | |
927 | return 1; | |
928 | } | |
5260325f | 929 | |
396c147e | 930 | static void |
c8e9c167 | 931 | channel_pre_x11_open_13(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 932 | { |
8e7895b8 | 933 | int ret = x11_open_helper(&c->output); |
e1feb9bf | 934 | |
7368a6c8 | 935 | if (ret == 1) { |
936 | /* Start normal processing for the channel. */ | |
937 | c->type = SSH_CHANNEL_OPEN; | |
a8be9f80 | 938 | channel_pre_open_13(c, readset, writeset); |
7368a6c8 | 939 | } else if (ret == -1) { |
940 | /* | |
941 | * We have received an X11 connection that has bad | |
942 | * authentication information. | |
943 | */ | |
bbe88b6d | 944 | logit("X11 connection rejected because of wrong authentication."); |
7368a6c8 | 945 | buffer_clear(&c->input); |
946 | buffer_clear(&c->output); | |
489aa2e9 | 947 | channel_close_fd(&c->sock); |
7368a6c8 | 948 | c->sock = -1; |
949 | c->type = SSH_CHANNEL_CLOSED; | |
950 | packet_start(SSH_MSG_CHANNEL_CLOSE); | |
951 | packet_put_int(c->remote_id); | |
952 | packet_send(); | |
953 | } | |
954 | } | |
5260325f | 955 | |
396c147e | 956 | static void |
c8e9c167 | 957 | channel_pre_x11_open(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 958 | { |
8e7895b8 | 959 | int ret = x11_open_helper(&c->output); |
a5f82435 | 960 | |
961 | /* c->force_drain = 1; */ | |
962 | ||
7368a6c8 | 963 | if (ret == 1) { |
964 | c->type = SSH_CHANNEL_OPEN; | |
0c0738d5 | 965 | channel_pre_open(c, readset, writeset); |
7368a6c8 | 966 | } else if (ret == -1) { |
bbe88b6d | 967 | logit("X11 connection rejected because of wrong authentication."); |
d7ac5f18 | 968 | debug2("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate); |
8341f420 | 969 | chan_read_failed(c); |
970 | buffer_clear(&c->input); | |
971 | chan_ibuf_empty(c); | |
972 | buffer_clear(&c->output); | |
973 | /* for proto v1, the peer will send an IEOF */ | |
974 | if (compat20) | |
975 | chan_write_failed(c); | |
976 | else | |
977 | c->type = SSH_CHANNEL_OPEN; | |
d7ac5f18 | 978 | debug2("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate); |
7368a6c8 | 979 | } |
980 | } | |
5260325f | 981 | |
28b9cb4d | 982 | /* try to decode a socks4 header */ |
ebb90778 | 983 | /* ARGSUSED */ |
396c147e | 984 | static int |
c8e9c167 | 985 | channel_decode_socks4(Channel *c, fd_set *readset, fd_set *writeset) |
0490e609 | 986 | { |
661e45a0 | 987 | char *p, *host; |
4866a6d6 | 988 | u_int len, have, i, found, need; |
184eed6a | 989 | char username[256]; |
0490e609 | 990 | struct { |
991 | u_int8_t version; | |
992 | u_int8_t command; | |
993 | u_int16_t dest_port; | |
28b9cb4d | 994 | struct in_addr dest_addr; |
0490e609 | 995 | } s4_req, s4_rsp; |
996 | ||
28b9cb4d | 997 | debug2("channel %d: decode socks4", c->self); |
53b8fe68 | 998 | |
999 | have = buffer_len(&c->input); | |
1000 | len = sizeof(s4_req); | |
1001 | if (have < len) | |
1002 | return 0; | |
1003 | p = buffer_ptr(&c->input); | |
4866a6d6 | 1004 | |
1005 | need = 1; | |
1006 | /* SOCKS4A uses an invalid IP address 0.0.0.x */ | |
1007 | if (p[4] == 0 && p[5] == 0 && p[6] == 0 && p[7] != 0) { | |
1008 | debug2("channel %d: socks4a request", c->self); | |
1009 | /* ... and needs an extra string (the hostname) */ | |
1010 | need = 2; | |
1011 | } | |
1012 | /* Check for terminating NUL on the string(s) */ | |
53b8fe68 | 1013 | for (found = 0, i = len; i < have; i++) { |
1014 | if (p[i] == '\0') { | |
4866a6d6 | 1015 | found++; |
1016 | if (found == need) | |
1017 | break; | |
53b8fe68 | 1018 | } |
1019 | if (i > 1024) { | |
1020 | /* the peer is probably sending garbage */ | |
1021 | debug("channel %d: decode socks4: too long", | |
1022 | c->self); | |
1023 | return -1; | |
1024 | } | |
1025 | } | |
4866a6d6 | 1026 | if (found < need) |
53b8fe68 | 1027 | return 0; |
0490e609 | 1028 | buffer_get(&c->input, (char *)&s4_req.version, 1); |
1029 | buffer_get(&c->input, (char *)&s4_req.command, 1); | |
1030 | buffer_get(&c->input, (char *)&s4_req.dest_port, 2); | |
28b9cb4d | 1031 | buffer_get(&c->input, (char *)&s4_req.dest_addr, 4); |
53b8fe68 | 1032 | have = buffer_len(&c->input); |
0490e609 | 1033 | p = buffer_ptr(&c->input); |
1034 | len = strlen(p); | |
6683b40f | 1035 | debug2("channel %d: decode socks4: user %s/%d", c->self, p, len); |
4866a6d6 | 1036 | len++; /* trailing '\0' */ |
0490e609 | 1037 | if (len > have) |
28b9cb4d | 1038 | fatal("channel %d: decode socks4: len %d > have %d", |
0490e609 | 1039 | c->self, len, have); |
1040 | strlcpy(username, p, sizeof(username)); | |
1041 | buffer_consume(&c->input, len); | |
0490e609 | 1042 | |
1338ba77 | 1043 | if (c->path != NULL) { |
1044 | xfree(c->path); | |
1045 | c->path = NULL; | |
1046 | } | |
4866a6d6 | 1047 | if (need == 1) { /* SOCKS4: one string */ |
1048 | host = inet_ntoa(s4_req.dest_addr); | |
1338ba77 | 1049 | c->path = xstrdup(host); |
4866a6d6 | 1050 | } else { /* SOCKS4A: two strings */ |
1051 | have = buffer_len(&c->input); | |
1052 | p = buffer_ptr(&c->input); | |
1053 | len = strlen(p); | |
1054 | debug2("channel %d: decode socks4a: host %s/%d", | |
1055 | c->self, p, len); | |
1056 | len++; /* trailing '\0' */ | |
1057 | if (len > have) | |
1058 | fatal("channel %d: decode socks4a: len %d > have %d", | |
1059 | c->self, len, have); | |
1338ba77 | 1060 | if (len > NI_MAXHOST) { |
4866a6d6 | 1061 | error("channel %d: hostname \"%.100s\" too long", |
1062 | c->self, p); | |
1063 | return -1; | |
1064 | } | |
1338ba77 | 1065 | c->path = xstrdup(p); |
4866a6d6 | 1066 | buffer_consume(&c->input, len); |
1067 | } | |
0490e609 | 1068 | c->host_port = ntohs(s4_req.dest_port); |
184eed6a | 1069 | |
d7ac5f18 | 1070 | debug2("channel %d: dynamic request: socks4 host %s port %u command %u", |
4866a6d6 | 1071 | c->self, c->path, c->host_port, s4_req.command); |
0490e609 | 1072 | |
28b9cb4d | 1073 | if (s4_req.command != 1) { |
4866a6d6 | 1074 | debug("channel %d: cannot handle: %s cn %d", |
1075 | c->self, need == 1 ? "SOCKS4" : "SOCKS4A", s4_req.command); | |
28b9cb4d | 1076 | return -1; |
0490e609 | 1077 | } |
28b9cb4d | 1078 | s4_rsp.version = 0; /* vn: 0 for reply */ |
1079 | s4_rsp.command = 90; /* cd: req granted */ | |
0490e609 | 1080 | s4_rsp.dest_port = 0; /* ignored */ |
28b9cb4d | 1081 | s4_rsp.dest_addr.s_addr = INADDR_ANY; /* ignored */ |
15dd2c4f | 1082 | buffer_append(&c->output, &s4_rsp, sizeof(s4_rsp)); |
28b9cb4d | 1083 | return 1; |
0490e609 | 1084 | } |
1085 | ||
f49658f5 | 1086 | /* try to decode a socks5 header */ |
1087 | #define SSH_SOCKS5_AUTHDONE 0x1000 | |
1088 | #define SSH_SOCKS5_NOAUTH 0x00 | |
1089 | #define SSH_SOCKS5_IPV4 0x01 | |
1090 | #define SSH_SOCKS5_DOMAIN 0x03 | |
1091 | #define SSH_SOCKS5_IPV6 0x04 | |
1092 | #define SSH_SOCKS5_CONNECT 0x01 | |
1093 | #define SSH_SOCKS5_SUCCESS 0x00 | |
1094 | ||
ebb90778 | 1095 | /* ARGSUSED */ |
f49658f5 | 1096 | static int |
c8e9c167 | 1097 | channel_decode_socks5(Channel *c, fd_set *readset, fd_set *writeset) |
f49658f5 | 1098 | { |
1099 | struct { | |
1100 | u_int8_t version; | |
1101 | u_int8_t command; | |
1102 | u_int8_t reserved; | |
1103 | u_int8_t atyp; | |
1104 | } s5_req, s5_rsp; | |
1105 | u_int16_t dest_port; | |
1338ba77 | 1106 | u_char *p, dest_addr[255+1], ntop[INET6_ADDRSTRLEN]; |
a217e418 | 1107 | u_int have, need, i, found, nmethods, addrlen, af; |
f49658f5 | 1108 | |
1109 | debug2("channel %d: decode socks5", c->self); | |
1110 | p = buffer_ptr(&c->input); | |
1111 | if (p[0] != 0x05) | |
1112 | return -1; | |
1113 | have = buffer_len(&c->input); | |
1114 | if (!(c->flags & SSH_SOCKS5_AUTHDONE)) { | |
1115 | /* format: ver | nmethods | methods */ | |
aff51935 | 1116 | if (have < 2) |
f49658f5 | 1117 | return 0; |
1118 | nmethods = p[1]; | |
1119 | if (have < nmethods + 2) | |
1120 | return 0; | |
1121 | /* look for method: "NO AUTHENTICATION REQUIRED" */ | |
4f6e2ba9 | 1122 | for (found = 0, i = 2; i < nmethods + 2; i++) { |
d4f40d92 | 1123 | if (p[i] == SSH_SOCKS5_NOAUTH) { |
f49658f5 | 1124 | found = 1; |
1125 | break; | |
1126 | } | |
1127 | } | |
1128 | if (!found) { | |
1129 | debug("channel %d: method SSH_SOCKS5_NOAUTH not found", | |
1130 | c->self); | |
1131 | return -1; | |
1132 | } | |
1133 | buffer_consume(&c->input, nmethods + 2); | |
1134 | buffer_put_char(&c->output, 0x05); /* version */ | |
1135 | buffer_put_char(&c->output, SSH_SOCKS5_NOAUTH); /* method */ | |
1136 | FD_SET(c->sock, writeset); | |
1137 | c->flags |= SSH_SOCKS5_AUTHDONE; | |
1138 | debug2("channel %d: socks5 auth done", c->self); | |
1139 | return 0; /* need more */ | |
1140 | } | |
1141 | debug2("channel %d: socks5 post auth", c->self); | |
1142 | if (have < sizeof(s5_req)+1) | |
1143 | return 0; /* need more */ | |
5b5f6af7 | 1144 | memcpy(&s5_req, p, sizeof(s5_req)); |
f49658f5 | 1145 | if (s5_req.version != 0x05 || |
1146 | s5_req.command != SSH_SOCKS5_CONNECT || | |
1147 | s5_req.reserved != 0x00) { | |
d7ac5f18 | 1148 | debug2("channel %d: only socks5 connect supported", c->self); |
f49658f5 | 1149 | return -1; |
1150 | } | |
f8cc7664 | 1151 | switch (s5_req.atyp){ |
f49658f5 | 1152 | case SSH_SOCKS5_IPV4: |
1153 | addrlen = 4; | |
1154 | af = AF_INET; | |
1155 | break; | |
1156 | case SSH_SOCKS5_DOMAIN: | |
1157 | addrlen = p[sizeof(s5_req)]; | |
1158 | af = -1; | |
1159 | break; | |
1160 | case SSH_SOCKS5_IPV6: | |
1161 | addrlen = 16; | |
1162 | af = AF_INET6; | |
1163 | break; | |
1164 | default: | |
d7ac5f18 | 1165 | debug2("channel %d: bad socks5 atyp %d", c->self, s5_req.atyp); |
f49658f5 | 1166 | return -1; |
1167 | } | |
a217e418 | 1168 | need = sizeof(s5_req) + addrlen + 2; |
1169 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) | |
1170 | need++; | |
1171 | if (have < need) | |
f49658f5 | 1172 | return 0; |
1173 | buffer_consume(&c->input, sizeof(s5_req)); | |
1174 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) | |
1175 | buffer_consume(&c->input, 1); /* host string length */ | |
1176 | buffer_get(&c->input, (char *)&dest_addr, addrlen); | |
1177 | buffer_get(&c->input, (char *)&dest_port, 2); | |
1178 | dest_addr[addrlen] = '\0'; | |
1338ba77 | 1179 | if (c->path != NULL) { |
1180 | xfree(c->path); | |
1181 | c->path = NULL; | |
1182 | } | |
1183 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) { | |
920706fd | 1184 | if (addrlen >= NI_MAXHOST) { |
1338ba77 | 1185 | error("channel %d: dynamic request: socks5 hostname " |
1186 | "\"%.100s\" too long", c->self, dest_addr); | |
1187 | return -1; | |
1188 | } | |
1189 | c->path = xstrdup(dest_addr); | |
1190 | } else { | |
1191 | if (inet_ntop(af, dest_addr, ntop, sizeof(ntop)) == NULL) | |
1192 | return -1; | |
1193 | c->path = xstrdup(ntop); | |
1194 | } | |
f49658f5 | 1195 | c->host_port = ntohs(dest_port); |
b6453d99 | 1196 | |
d7ac5f18 | 1197 | debug2("channel %d: dynamic request: socks5 host %s port %u command %u", |
f49658f5 | 1198 | c->self, c->path, c->host_port, s5_req.command); |
1199 | ||
1200 | s5_rsp.version = 0x05; | |
1201 | s5_rsp.command = SSH_SOCKS5_SUCCESS; | |
1202 | s5_rsp.reserved = 0; /* ignored */ | |
1203 | s5_rsp.atyp = SSH_SOCKS5_IPV4; | |
1204 | ((struct in_addr *)&dest_addr)->s_addr = INADDR_ANY; | |
1205 | dest_port = 0; /* ignored */ | |
1206 | ||
15dd2c4f | 1207 | buffer_append(&c->output, &s5_rsp, sizeof(s5_rsp)); |
1208 | buffer_append(&c->output, &dest_addr, sizeof(struct in_addr)); | |
1209 | buffer_append(&c->output, &dest_port, sizeof(dest_port)); | |
f49658f5 | 1210 | return 1; |
1211 | } | |
1212 | ||
28b9cb4d | 1213 | /* dynamic port forwarding */ |
396c147e | 1214 | static void |
c8e9c167 | 1215 | channel_pre_dynamic(Channel *c, fd_set *readset, fd_set *writeset) |
28b9cb4d | 1216 | { |
1217 | u_char *p; | |
2ceb8101 | 1218 | u_int have; |
1219 | int ret; | |
28b9cb4d | 1220 | |
1221 | have = buffer_len(&c->input); | |
639cb8ab | 1222 | c->delayed = 0; |
28b9cb4d | 1223 | debug2("channel %d: pre_dynamic: have %d", c->self, have); |
070adba2 | 1224 | /* buffer_dump(&c->input); */ |
28b9cb4d | 1225 | /* check if the fixed size part of the packet is in buffer. */ |
f49658f5 | 1226 | if (have < 3) { |
28b9cb4d | 1227 | /* need more */ |
1228 | FD_SET(c->sock, readset); | |
1229 | return; | |
1230 | } | |
1231 | /* try to guess the protocol */ | |
1232 | p = buffer_ptr(&c->input); | |
1233 | switch (p[0]) { | |
6683b40f | 1234 | case 0x04: |
1235 | ret = channel_decode_socks4(c, readset, writeset); | |
1236 | break; | |
f49658f5 | 1237 | case 0x05: |
1238 | ret = channel_decode_socks5(c, readset, writeset); | |
1239 | break; | |
28b9cb4d | 1240 | default: |
1241 | ret = -1; | |
1242 | break; | |
1243 | } | |
1244 | if (ret < 0) { | |
719fc62f | 1245 | chan_mark_dead(c); |
28b9cb4d | 1246 | } else if (ret == 0) { |
1247 | debug2("channel %d: pre_dynamic: need more", c->self); | |
1248 | /* need more */ | |
1249 | FD_SET(c->sock, readset); | |
1250 | } else { | |
1251 | /* switch to the next state */ | |
1252 | c->type = SSH_CHANNEL_OPENING; | |
1253 | port_open_helper(c, "direct-tcpip"); | |
1254 | } | |
1255 | } | |
0490e609 | 1256 | |
7368a6c8 | 1257 | /* This is our fake X11 server socket. */ |
ebb90778 | 1258 | /* ARGSUSED */ |
396c147e | 1259 | static void |
c8e9c167 | 1260 | channel_post_x11_listener(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1261 | { |
719fc62f | 1262 | Channel *nc; |
9fb764ab | 1263 | struct sockaddr_storage addr; |
bcc0381e | 1264 | int newsock; |
7368a6c8 | 1265 | socklen_t addrlen; |
865ac82e | 1266 | char buf[16384], *remote_ipaddr; |
0b242b12 | 1267 | int remote_port; |
7368a6c8 | 1268 | |
1269 | if (FD_ISSET(c->sock, readset)) { | |
1270 | debug("X11 connection requested."); | |
1271 | addrlen = sizeof(addr); | |
9fb764ab | 1272 | newsock = accept(c->sock, (struct sockaddr *)&addr, &addrlen); |
ac151b18 | 1273 | if (c->single_connection) { |
d7ac5f18 | 1274 | debug2("single_connection: closing X11 listener."); |
ac151b18 | 1275 | channel_close_fd(&c->sock); |
1276 | chan_mark_dead(c); | |
1277 | } | |
7368a6c8 | 1278 | if (newsock < 0) { |
1279 | error("accept: %.100s", strerror(errno)); | |
1280 | return; | |
5260325f | 1281 | } |
bcc0381e | 1282 | set_nodelay(newsock); |
865ac82e | 1283 | remote_ipaddr = get_peer_ipaddr(newsock); |
0b242b12 | 1284 | remote_port = get_peer_port(newsock); |
7368a6c8 | 1285 | snprintf(buf, sizeof buf, "X11 connection from %.200s port %d", |
865ac82e | 1286 | remote_ipaddr, remote_port); |
0b242b12 | 1287 | |
719fc62f | 1288 | nc = channel_new("accepted x11 socket", |
0b242b12 | 1289 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
0d942eff | 1290 | c->local_window_max, c->local_maxpacket, 0, buf, 1); |
0b242b12 | 1291 | if (compat20) { |
1292 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1293 | packet_put_cstring("x11"); | |
719fc62f | 1294 | packet_put_int(nc->self); |
ac151b18 | 1295 | packet_put_int(nc->local_window_max); |
1296 | packet_put_int(nc->local_maxpacket); | |
865ac82e | 1297 | /* originator ipaddr and port */ |
1298 | packet_put_cstring(remote_ipaddr); | |
d0c832f3 | 1299 | if (datafellows & SSH_BUG_X11FWD) { |
d7ac5f18 | 1300 | debug2("ssh2 x11 bug compat mode"); |
d0c832f3 | 1301 | } else { |
1302 | packet_put_int(remote_port); | |
1303 | } | |
0b242b12 | 1304 | packet_send(); |
1305 | } else { | |
1306 | packet_start(SSH_SMSG_X11_OPEN); | |
719fc62f | 1307 | packet_put_int(nc->self); |
8e7895b8 | 1308 | if (packet_get_protocol_flags() & |
1309 | SSH_PROTOFLAG_HOST_IN_FWD_OPEN) | |
449c5ba5 | 1310 | packet_put_cstring(buf); |
0b242b12 | 1311 | packet_send(); |
1312 | } | |
865ac82e | 1313 | xfree(remote_ipaddr); |
8efc0c15 | 1314 | } |
8efc0c15 | 1315 | } |
1316 | ||
396c147e | 1317 | static void |
0490e609 | 1318 | port_open_helper(Channel *c, char *rtype) |
1319 | { | |
1320 | int direct; | |
1321 | char buf[1024]; | |
1322 | char *remote_ipaddr = get_peer_ipaddr(c->sock); | |
29798ed0 | 1323 | int remote_port = get_peer_port(c->sock); |
0490e609 | 1324 | |
1325 | direct = (strcmp(rtype, "direct-tcpip") == 0); | |
1326 | ||
1327 | snprintf(buf, sizeof buf, | |
1328 | "%s: listening port %d for %.100s port %d, " | |
1329 | "connect from %.200s port %d", | |
1330 | rtype, c->listening_port, c->path, c->host_port, | |
1331 | remote_ipaddr, remote_port); | |
1332 | ||
1333 | xfree(c->remote_name); | |
1334 | c->remote_name = xstrdup(buf); | |
1335 | ||
1336 | if (compat20) { | |
1337 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1338 | packet_put_cstring(rtype); | |
1339 | packet_put_int(c->self); | |
1340 | packet_put_int(c->local_window_max); | |
1341 | packet_put_int(c->local_maxpacket); | |
1342 | if (direct) { | |
1343 | /* target host, port */ | |
1344 | packet_put_cstring(c->path); | |
1345 | packet_put_int(c->host_port); | |
1346 | } else { | |
1347 | /* listen address, port */ | |
1348 | packet_put_cstring(c->path); | |
1349 | packet_put_int(c->listening_port); | |
1350 | } | |
1351 | /* originator host and port */ | |
1352 | packet_put_cstring(remote_ipaddr); | |
29798ed0 | 1353 | packet_put_int((u_int)remote_port); |
0490e609 | 1354 | packet_send(); |
1355 | } else { | |
1356 | packet_start(SSH_MSG_PORT_OPEN); | |
1357 | packet_put_int(c->self); | |
1358 | packet_put_cstring(c->path); | |
1359 | packet_put_int(c->host_port); | |
8e7895b8 | 1360 | if (packet_get_protocol_flags() & |
1361 | SSH_PROTOFLAG_HOST_IN_FWD_OPEN) | |
0490e609 | 1362 | packet_put_cstring(c->remote_name); |
1363 | packet_send(); | |
1364 | } | |
1365 | xfree(remote_ipaddr); | |
1366 | } | |
1367 | ||
442aee3a | 1368 | static void |
1369 | channel_set_reuseaddr(int fd) | |
1370 | { | |
1371 | int on = 1; | |
1372 | ||
1373 | /* | |
1374 | * Set socket options. | |
1375 | * Allow local port reuse in TIME_WAIT. | |
1376 | */ | |
1377 | if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1) | |
1378 | error("setsockopt SO_REUSEADDR fd %d: %s", fd, strerror(errno)); | |
1379 | } | |
1380 | ||
aa3378df | 1381 | /* |
7368a6c8 | 1382 | * This socket is listening for connections to a forwarded TCP/IP port. |
aa3378df | 1383 | */ |
ebb90778 | 1384 | /* ARGSUSED */ |
396c147e | 1385 | static void |
c8e9c167 | 1386 | channel_post_port_listener(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1387 | { |
0490e609 | 1388 | Channel *nc; |
9fb764ab | 1389 | struct sockaddr_storage addr; |
719fc62f | 1390 | int newsock, nextstate; |
7368a6c8 | 1391 | socklen_t addrlen; |
0490e609 | 1392 | char *rtype; |
fa08c86b | 1393 | |
7368a6c8 | 1394 | if (FD_ISSET(c->sock, readset)) { |
1395 | debug("Connection to port %d forwarding " | |
1396 | "to %.100s port %d requested.", | |
1397 | c->listening_port, c->path, c->host_port); | |
0490e609 | 1398 | |
639cb8ab | 1399 | if (c->type == SSH_CHANNEL_RPORT_LISTENER) { |
1400 | nextstate = SSH_CHANNEL_OPENING; | |
1401 | rtype = "forwarded-tcpip"; | |
1402 | } else { | |
1403 | if (c->host_port == 0) { | |
1404 | nextstate = SSH_CHANNEL_DYNAMIC; | |
f3964cb9 | 1405 | rtype = "dynamic-tcpip"; |
639cb8ab | 1406 | } else { |
1407 | nextstate = SSH_CHANNEL_OPENING; | |
1408 | rtype = "direct-tcpip"; | |
1409 | } | |
1410 | } | |
0490e609 | 1411 | |
7368a6c8 | 1412 | addrlen = sizeof(addr); |
9fb764ab | 1413 | newsock = accept(c->sock, (struct sockaddr *)&addr, &addrlen); |
7368a6c8 | 1414 | if (newsock < 0) { |
1415 | error("accept: %.100s", strerror(errno)); | |
1416 | return; | |
1417 | } | |
811a6342 | 1418 | set_nodelay(newsock); |
0d942eff | 1419 | nc = channel_new(rtype, nextstate, newsock, newsock, -1, |
1420 | c->local_window_max, c->local_maxpacket, 0, rtype, 1); | |
0490e609 | 1421 | nc->listening_port = c->listening_port; |
1422 | nc->host_port = c->host_port; | |
1338ba77 | 1423 | if (c->path != NULL) |
1424 | nc->path = xstrdup(c->path); | |
0490e609 | 1425 | |
639cb8ab | 1426 | if (nextstate == SSH_CHANNEL_DYNAMIC) { |
1427 | /* | |
1428 | * do not call the channel_post handler until | |
1429 | * this flag has been reset by a pre-handler. | |
1430 | * otherwise the FD_ISSET calls might overflow | |
1431 | */ | |
1432 | nc->delayed = 1; | |
1433 | } else { | |
0490e609 | 1434 | port_open_helper(nc, rtype); |
639cb8ab | 1435 | } |
7368a6c8 | 1436 | } |
1437 | } | |
8efc0c15 | 1438 | |
7368a6c8 | 1439 | /* |
1440 | * This is the authentication agent socket listening for connections from | |
1441 | * clients. | |
1442 | */ | |
ebb90778 | 1443 | /* ARGSUSED */ |
396c147e | 1444 | static void |
c8e9c167 | 1445 | channel_post_auth_listener(Channel *c, fd_set *readset, fd_set *writeset) |
8efc0c15 | 1446 | { |
719fc62f | 1447 | Channel *nc; |
1448 | int newsock; | |
9fb764ab | 1449 | struct sockaddr_storage addr; |
48e671d5 | 1450 | socklen_t addrlen; |
5260325f | 1451 | |
7368a6c8 | 1452 | if (FD_ISSET(c->sock, readset)) { |
1453 | addrlen = sizeof(addr); | |
9fb764ab | 1454 | newsock = accept(c->sock, (struct sockaddr *)&addr, &addrlen); |
7368a6c8 | 1455 | if (newsock < 0) { |
1456 | error("accept from auth socket: %.100s", strerror(errno)); | |
1457 | return; | |
1458 | } | |
719fc62f | 1459 | nc = channel_new("accepted auth socket", |
fa08c86b | 1460 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
1461 | c->local_window_max, c->local_maxpacket, | |
0d942eff | 1462 | 0, "accepted auth socket", 1); |
fa08c86b | 1463 | if (compat20) { |
1464 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1465 | packet_put_cstring("auth-agent@openssh.com"); | |
719fc62f | 1466 | packet_put_int(nc->self); |
fa08c86b | 1467 | packet_put_int(c->local_window_max); |
1468 | packet_put_int(c->local_maxpacket); | |
1469 | } else { | |
1470 | packet_start(SSH_SMSG_AGENT_OPEN); | |
719fc62f | 1471 | packet_put_int(nc->self); |
fa08c86b | 1472 | } |
7368a6c8 | 1473 | packet_send(); |
1474 | } | |
1475 | } | |
5260325f | 1476 | |
ebb90778 | 1477 | /* ARGSUSED */ |
396c147e | 1478 | static void |
c8e9c167 | 1479 | channel_post_connecting(Channel *c, fd_set *readset, fd_set *writeset) |
97fb6912 | 1480 | { |
e07e21ad | 1481 | int err = 0, sock; |
8ab2cb35 | 1482 | socklen_t sz = sizeof(err); |
d18e0850 | 1483 | |
97fb6912 | 1484 | if (FD_ISSET(c->sock, writeset)) { |
db518d9b | 1485 | if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, &err, &sz) < 0) { |
d18e0850 | 1486 | err = errno; |
1487 | error("getsockopt SO_ERROR failed"); | |
1488 | } | |
1489 | if (err == 0) { | |
e07e21ad | 1490 | debug("channel %d: connected to %s port %d", |
1491 | c->self, c->connect_ctx.host, c->connect_ctx.port); | |
1492 | channel_connect_ctx_free(&c->connect_ctx); | |
d18e0850 | 1493 | c->type = SSH_CHANNEL_OPEN; |
1494 | if (compat20) { | |
1495 | packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1496 | packet_put_int(c->remote_id); | |
1497 | packet_put_int(c->self); | |
1498 | packet_put_int(c->local_window); | |
1499 | packet_put_int(c->local_maxpacket); | |
1500 | } else { | |
1501 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1502 | packet_put_int(c->remote_id); | |
1503 | packet_put_int(c->self); | |
1504 | } | |
97fb6912 | 1505 | } else { |
e07e21ad | 1506 | debug("channel %d: connection failed: %s", |
d18e0850 | 1507 | c->self, strerror(err)); |
e07e21ad | 1508 | /* Try next address, if any */ |
1509 | if ((sock = connect_next(&c->connect_ctx)) > 0) { | |
1510 | close(c->sock); | |
1511 | c->sock = c->rfd = c->wfd = sock; | |
1512 | channel_max_fd = channel_find_maxfd(); | |
1513 | return; | |
1514 | } | |
1515 | /* Exhausted all addresses */ | |
1516 | error("connect_to %.100s port %d: failed.", | |
1517 | c->connect_ctx.host, c->connect_ctx.port); | |
1518 | channel_connect_ctx_free(&c->connect_ctx); | |
d18e0850 | 1519 | if (compat20) { |
1520 | packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); | |
1521 | packet_put_int(c->remote_id); | |
1522 | packet_put_int(SSH2_OPEN_CONNECT_FAILED); | |
1523 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { | |
1524 | packet_put_cstring(strerror(err)); | |
1525 | packet_put_cstring(""); | |
1526 | } | |
97fb6912 | 1527 | } else { |
d18e0850 | 1528 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
1529 | packet_put_int(c->remote_id); | |
97fb6912 | 1530 | } |
d18e0850 | 1531 | chan_mark_dead(c); |
97fb6912 | 1532 | } |
d18e0850 | 1533 | packet_send(); |
97fb6912 | 1534 | } |
1535 | } | |
1536 | ||
ebb90778 | 1537 | /* ARGSUSED */ |
396c147e | 1538 | static int |
c8e9c167 | 1539 | channel_handle_rfd(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1540 | { |
fa1d7d85 | 1541 | char buf[CHAN_RBUF]; |
bd6a1355 | 1542 | int len, force; |
7368a6c8 | 1543 | |
bd6a1355 | 1544 | force = c->isatty && c->detach_close && c->istate != CHAN_INPUT_CLOSED; |
1545 | if (c->rfd != -1 && (force || FD_ISSET(c->rfd, readset))) { | |
ea8c44d9 | 1546 | errno = 0; |
7368a6c8 | 1547 | len = read(c->rfd, buf, sizeof(buf)); |
5a0c8771 | 1548 | if (len < 0 && (errno == EINTR || |
1549 | ((errno == EAGAIN || errno == EWOULDBLOCK) && !force))) | |
0fbe8c74 | 1550 | return 1; |
ea8c44d9 | 1551 | #ifndef PTY_ZEROREAD |
7368a6c8 | 1552 | if (len <= 0) { |
ea8c44d9 | 1553 | #else |
9c04d67d | 1554 | if ((!c->isatty && len <= 0) || |
1555 | (c->isatty && (len < 0 || (len == 0 && errno != 0)))) { | |
ea8c44d9 | 1556 | #endif |
d7ac5f18 | 1557 | debug2("channel %d: read<=0 rfd %d len %d", |
7368a6c8 | 1558 | c->self, c->rfd, len); |
28b9cb4d | 1559 | if (c->type != SSH_CHANNEL_OPEN) { |
d7ac5f18 | 1560 | debug2("channel %d: not open", c->self); |
719fc62f | 1561 | chan_mark_dead(c); |
0490e609 | 1562 | return -1; |
28b9cb4d | 1563 | } else if (compat13) { |
9c50edcf | 1564 | buffer_clear(&c->output); |
7368a6c8 | 1565 | c->type = SSH_CHANNEL_INPUT_DRAINING; |
d7ac5f18 | 1566 | debug2("channel %d: input draining.", c->self); |
7368a6c8 | 1567 | } else { |
1568 | chan_read_failed(c); | |
5260325f | 1569 | } |
7368a6c8 | 1570 | return -1; |
1571 | } | |
6aacefa7 | 1572 | if (c->input_filter != NULL) { |
2e73a022 | 1573 | if (c->input_filter(c, buf, len) == -1) { |
d7ac5f18 | 1574 | debug2("channel %d: filter stops", c->self); |
2e73a022 | 1575 | chan_read_failed(c); |
1576 | } | |
d20f3c9e | 1577 | } else if (c->datagram) { |
1578 | buffer_put_string(&c->input, buf, len); | |
2e73a022 | 1579 | } else { |
1580 | buffer_append(&c->input, buf, len); | |
1581 | } | |
7368a6c8 | 1582 | } |
1583 | return 1; | |
1584 | } | |
a7137f6b | 1585 | |
ebb90778 | 1586 | /* ARGSUSED */ |
396c147e | 1587 | static int |
c8e9c167 | 1588 | channel_handle_wfd(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1589 | { |
95ce5599 | 1590 | struct termios tio; |
c1c6a032 | 1591 | u_char *data = NULL, *buf; |
780a9951 | 1592 | u_int dlen; |
7368a6c8 | 1593 | int len; |
1594 | ||
1595 | /* Send buffered output data to the socket. */ | |
6fd8622b | 1596 | if (c->wfd != -1 && |
7368a6c8 | 1597 | FD_ISSET(c->wfd, writeset) && |
1598 | buffer_len(&c->output) > 0) { | |
c1c6a032 | 1599 | if (c->output_filter != NULL) { |
1600 | if ((buf = c->output_filter(c, &data, &dlen)) == NULL) { | |
1601 | debug2("channel %d: filter stops", c->self); | |
d7b37427 | 1602 | if (c->type != SSH_CHANNEL_OPEN) |
1603 | chan_mark_dead(c); | |
1604 | else | |
1605 | chan_write_failed(c); | |
1606 | return -1; | |
c1c6a032 | 1607 | } |
1608 | } else if (c->datagram) { | |
1609 | buf = data = buffer_get_string(&c->output, &dlen); | |
1610 | } else { | |
1611 | buf = data = buffer_ptr(&c->output); | |
1612 | dlen = buffer_len(&c->output); | |
1613 | } | |
1614 | ||
d20f3c9e | 1615 | if (c->datagram) { |
d20f3c9e | 1616 | /* ignore truncated writes, datagrams might get lost */ |
1617 | c->local_consumed += dlen + 4; | |
c1c6a032 | 1618 | len = write(c->wfd, buf, dlen); |
d20f3c9e | 1619 | xfree(data); |
5a0c8771 | 1620 | if (len < 0 && (errno == EINTR || errno == EAGAIN || |
1621 | errno == EWOULDBLOCK)) | |
d20f3c9e | 1622 | return 1; |
1623 | if (len <= 0) { | |
1624 | if (c->type != SSH_CHANNEL_OPEN) | |
1625 | chan_mark_dead(c); | |
1626 | else | |
1627 | chan_write_failed(c); | |
1628 | return -1; | |
1629 | } | |
1630 | return 1; | |
1631 | } | |
64c0ce80 | 1632 | #ifdef _AIX |
aff51935 | 1633 | /* XXX: Later AIX versions can't push as much data to tty */ |
7fbb4189 | 1634 | if (compat20 && c->wfd_isatty) |
1635 | dlen = MIN(dlen, 8*1024); | |
64c0ce80 | 1636 | #endif |
c1c6a032 | 1637 | |
1638 | len = write(c->wfd, buf, dlen); | |
5a0c8771 | 1639 | if (len < 0 && |
1640 | (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK)) | |
0fbe8c74 | 1641 | return 1; |
7368a6c8 | 1642 | if (len <= 0) { |
28b9cb4d | 1643 | if (c->type != SSH_CHANNEL_OPEN) { |
d7ac5f18 | 1644 | debug2("channel %d: not open", c->self); |
719fc62f | 1645 | chan_mark_dead(c); |
28b9cb4d | 1646 | return -1; |
1647 | } else if (compat13) { | |
9c50edcf | 1648 | buffer_clear(&c->output); |
d7ac5f18 | 1649 | debug2("channel %d: input draining.", c->self); |
7368a6c8 | 1650 | c->type = SSH_CHANNEL_INPUT_DRAINING; |
1651 | } else { | |
1652 | chan_write_failed(c); | |
5260325f | 1653 | } |
7368a6c8 | 1654 | return -1; |
1655 | } | |
c1c6a032 | 1656 | if (compat20 && c->isatty && dlen >= 1 && buf[0] != '\r') { |
0ae4fe1d | 1657 | if (tcgetattr(c->wfd, &tio) == 0 && |
1658 | !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) { | |
1659 | /* | |
1660 | * Simulate echo to reduce the impact of | |
355724fc | 1661 | * traffic analysis. We need to match the |
95ce5599 | 1662 | * size of a SSH2_MSG_CHANNEL_DATA message |
c1c6a032 | 1663 | * (4 byte channel id + buf) |
0ae4fe1d | 1664 | */ |
95ce5599 | 1665 | packet_send_ignore(4 + len); |
0ae4fe1d | 1666 | packet_send(); |
0ae4fe1d | 1667 | } |
1668 | } | |
7368a6c8 | 1669 | buffer_consume(&c->output, len); |
7e7327a1 | 1670 | if (compat20 && len > 0) { |
1671 | c->local_consumed += len; | |
1672 | } | |
1673 | } | |
1674 | return 1; | |
1675 | } | |
a7137f6b | 1676 | |
396c147e | 1677 | static int |
c8e9c167 | 1678 | channel_handle_efd(Channel *c, fd_set *readset, fd_set *writeset) |
7e7327a1 | 1679 | { |
fa1d7d85 | 1680 | char buf[CHAN_RBUF]; |
7e7327a1 | 1681 | int len; |
1682 | ||
8ce64345 | 1683 | /** XXX handle drain efd, too */ |
7e7327a1 | 1684 | if (c->efd != -1) { |
1685 | if (c->extended_usage == CHAN_EXTENDED_WRITE && | |
1686 | FD_ISSET(c->efd, writeset) && | |
1687 | buffer_len(&c->extended) > 0) { | |
1688 | len = write(c->efd, buffer_ptr(&c->extended), | |
1689 | buffer_len(&c->extended)); | |
de273eef | 1690 | debug2("channel %d: written %d to efd %d", |
7e7327a1 | 1691 | c->self, len, c->efd); |
5a0c8771 | 1692 | if (len < 0 && (errno == EINTR || errno == EAGAIN || |
1693 | errno == EWOULDBLOCK)) | |
ee55dacf | 1694 | return 1; |
1695 | if (len <= 0) { | |
1696 | debug2("channel %d: closing write-efd %d", | |
1697 | c->self, c->efd); | |
489aa2e9 | 1698 | channel_close_fd(&c->efd); |
ee55dacf | 1699 | } else { |
7e7327a1 | 1700 | buffer_consume(&c->extended, len); |
1701 | c->local_consumed += len; | |
1702 | } | |
1703 | } else if (c->extended_usage == CHAN_EXTENDED_READ && | |
34640ce6 | 1704 | (c->detach_close || FD_ISSET(c->efd, readset))) { |
7e7327a1 | 1705 | len = read(c->efd, buf, sizeof(buf)); |
de273eef | 1706 | debug2("channel %d: read %d from efd %d", |
184eed6a | 1707 | c->self, len, c->efd); |
5a0c8771 | 1708 | if (len < 0 && (errno == EINTR || ((errno == EAGAIN || |
1709 | errno == EWOULDBLOCK) && !c->detach_close))) | |
ee55dacf | 1710 | return 1; |
1711 | if (len <= 0) { | |
1712 | debug2("channel %d: closing read-efd %d", | |
8ce64345 | 1713 | c->self, c->efd); |
489aa2e9 | 1714 | channel_close_fd(&c->efd); |
ee55dacf | 1715 | } else { |
7e7327a1 | 1716 | buffer_append(&c->extended, buf, len); |
ee55dacf | 1717 | } |
7e7327a1 | 1718 | } |
1719 | } | |
1720 | return 1; | |
1721 | } | |
a7137f6b | 1722 | |
ebb90778 | 1723 | /* ARGSUSED */ |
396c147e | 1724 | static int |
c8e9c167 | 1725 | channel_handle_ctl(Channel *c, fd_set *readset, fd_set *writeset) |
5e96b616 | 1726 | { |
1727 | char buf[16]; | |
1728 | int len; | |
1729 | ||
1730 | /* Monitor control fd to detect if the slave client exits */ | |
1731 | if (c->ctl_fd != -1 && FD_ISSET(c->ctl_fd, readset)) { | |
1732 | len = read(c->ctl_fd, buf, sizeof(buf)); | |
5a0c8771 | 1733 | if (len < 0 && |
1734 | (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK)) | |
5e96b616 | 1735 | return 1; |
1736 | if (len <= 0) { | |
1737 | debug2("channel %d: ctl read<=0", c->self); | |
1738 | if (c->type != SSH_CHANNEL_OPEN) { | |
1739 | debug2("channel %d: not open", c->self); | |
1740 | chan_mark_dead(c); | |
1741 | return -1; | |
1742 | } else { | |
1743 | chan_read_failed(c); | |
1744 | chan_write_failed(c); | |
1745 | } | |
1746 | return -1; | |
1747 | } else | |
1748 | fatal("%s: unexpected data on ctl fd", __func__); | |
1749 | } | |
1750 | return 1; | |
1751 | } | |
a7137f6b | 1752 | |
5e96b616 | 1753 | static int |
ee55dacf | 1754 | channel_check_window(Channel *c) |
7e7327a1 | 1755 | { |
28b9cb4d | 1756 | if (c->type == SSH_CHANNEL_OPEN && |
1757 | !(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) && | |
d9245683 | 1758 | ((c->local_window_max - c->local_window > |
68a73f53 | 1759 | c->local_maxpacket*3) || |
1760 | c->local_window < c->local_window_max/2) && | |
7e7327a1 | 1761 | c->local_consumed > 0) { |
1762 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); | |
1763 | packet_put_int(c->remote_id); | |
1764 | packet_put_int(c->local_consumed); | |
1765 | packet_send(); | |
de273eef | 1766 | debug2("channel %d: window %d sent adjust %d", |
7e7327a1 | 1767 | c->self, c->local_window, |
1768 | c->local_consumed); | |
1769 | c->local_window += c->local_consumed; | |
1770 | c->local_consumed = 0; | |
7368a6c8 | 1771 | } |
1772 | return 1; | |
1773 | } | |
5260325f | 1774 | |
396c147e | 1775 | static void |
c8e9c167 | 1776 | channel_post_open(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1777 | { |
639cb8ab | 1778 | if (c->delayed) |
1779 | return; | |
7368a6c8 | 1780 | channel_handle_rfd(c, readset, writeset); |
1781 | channel_handle_wfd(c, readset, writeset); | |
0c0738d5 | 1782 | if (!compat20) |
639cb8ab | 1783 | return; |
7e7327a1 | 1784 | channel_handle_efd(c, readset, writeset); |
5e96b616 | 1785 | channel_handle_ctl(c, readset, writeset); |
ee55dacf | 1786 | channel_check_window(c); |
7e7327a1 | 1787 | } |
1788 | ||
ebb90778 | 1789 | /* ARGSUSED */ |
396c147e | 1790 | static void |
c8e9c167 | 1791 | channel_post_output_drain_13(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1792 | { |
1793 | int len; | |
e1feb9bf | 1794 | |
7368a6c8 | 1795 | /* Send buffered output data to the socket. */ |
1796 | if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) { | |
1797 | len = write(c->sock, buffer_ptr(&c->output), | |
1798 | buffer_len(&c->output)); | |
1799 | if (len <= 0) | |
9c50edcf | 1800 | buffer_clear(&c->output); |
7368a6c8 | 1801 | else |
1802 | buffer_consume(&c->output, len); | |
1803 | } | |
1804 | } | |
5260325f | 1805 | |
396c147e | 1806 | static void |
7e7327a1 | 1807 | channel_handler_init_20(void) |
1808 | { | |
0c0738d5 | 1809 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open; |
0b242b12 | 1810 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
7e7327a1 | 1811 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; |
fa08c86b | 1812 | channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener; |
0b242b12 | 1813 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
fa08c86b | 1814 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; |
97fb6912 | 1815 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1816 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7e7327a1 | 1817 | |
0c0738d5 | 1818 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
7e7327a1 | 1819 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; |
fa08c86b | 1820 | channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener; |
0b242b12 | 1821 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
fa08c86b | 1822 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; |
97fb6912 | 1823 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 1824 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
7e7327a1 | 1825 | } |
1826 | ||
396c147e | 1827 | static void |
7368a6c8 | 1828 | channel_handler_init_13(void) |
1829 | { | |
1830 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13; | |
1831 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_13; | |
1832 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; | |
1833 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; | |
1834 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; | |
1835 | channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining; | |
1836 | channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining; | |
97fb6912 | 1837 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1838 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7368a6c8 | 1839 | |
0c0738d5 | 1840 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
7368a6c8 | 1841 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
1842 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; | |
1843 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; | |
1844 | channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13; | |
97fb6912 | 1845 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 1846 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
7368a6c8 | 1847 | } |
5260325f | 1848 | |
396c147e | 1849 | static void |
7368a6c8 | 1850 | channel_handler_init_15(void) |
1851 | { | |
0c0738d5 | 1852 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open; |
0b242b12 | 1853 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
7368a6c8 | 1854 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
1855 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; | |
1856 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; | |
97fb6912 | 1857 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1858 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7368a6c8 | 1859 | |
1860 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; | |
1861 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; | |
1862 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; | |
0c0738d5 | 1863 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
97fb6912 | 1864 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 1865 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
7368a6c8 | 1866 | } |
1867 | ||
396c147e | 1868 | static void |
7368a6c8 | 1869 | channel_handler_init(void) |
1870 | { | |
1871 | int i; | |
e1feb9bf | 1872 | |
184eed6a | 1873 | for (i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) { |
7368a6c8 | 1874 | channel_pre[i] = NULL; |
1875 | channel_post[i] = NULL; | |
1876 | } | |
7e7327a1 | 1877 | if (compat20) |
1878 | channel_handler_init_20(); | |
1879 | else if (compat13) | |
7368a6c8 | 1880 | channel_handler_init_13(); |
1881 | else | |
1882 | channel_handler_init_15(); | |
1883 | } | |
1884 | ||
418e724c | 1885 | /* gc dead channels */ |
1886 | static void | |
1887 | channel_garbage_collect(Channel *c) | |
1888 | { | |
1889 | if (c == NULL) | |
1890 | return; | |
1891 | if (c->detach_user != NULL) { | |
8cd0437d | 1892 | if (!chan_is_dead(c, c->detach_close)) |
418e724c | 1893 | return; |
d7ac5f18 | 1894 | debug2("channel %d: gc: notify user", c->self); |
418e724c | 1895 | c->detach_user(c->self, NULL); |
1896 | /* if we still have a callback */ | |
1897 | if (c->detach_user != NULL) | |
1898 | return; | |
d7ac5f18 | 1899 | debug2("channel %d: gc: user detached", c->self); |
418e724c | 1900 | } |
1901 | if (!chan_is_dead(c, 1)) | |
1902 | return; | |
d7ac5f18 | 1903 | debug2("channel %d: garbage collecting", c->self); |
418e724c | 1904 | channel_free(c); |
1905 | } | |
1906 | ||
396c147e | 1907 | static void |
c8e9c167 | 1908 | channel_handler(chan_fn *ftab[], fd_set *readset, fd_set *writeset) |
7368a6c8 | 1909 | { |
1910 | static int did_init = 0; | |
9a995072 | 1911 | u_int i; |
7368a6c8 | 1912 | Channel *c; |
1913 | ||
1914 | if (!did_init) { | |
1915 | channel_handler_init(); | |
1916 | did_init = 1; | |
1917 | } | |
1918 | for (i = 0; i < channels_alloc; i++) { | |
719fc62f | 1919 | c = channels[i]; |
1920 | if (c == NULL) | |
5260325f | 1921 | continue; |
6fd8622b | 1922 | if (ftab[c->type] != NULL) |
1923 | (*ftab[c->type])(c, readset, writeset); | |
418e724c | 1924 | channel_garbage_collect(c); |
8efc0c15 | 1925 | } |
8efc0c15 | 1926 | } |
1927 | ||
8e7895b8 | 1928 | /* |
1929 | * Allocate/update select bitmasks and add any bits relevant to channels in | |
1930 | * select bitmasks. | |
1931 | */ | |
6ae2364d | 1932 | void |
c422989b | 1933 | channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp, |
9a995072 | 1934 | u_int *nallocp, int rekeying) |
7368a6c8 | 1935 | { |
c5d10563 | 1936 | u_int n, sz, nfdset; |
39929cdb | 1937 | |
1938 | n = MAX(*maxfdp, channel_max_fd); | |
1939 | ||
c5d10563 | 1940 | nfdset = howmany(n+1, NFDBITS); |
1941 | /* Explicitly test here, because xrealloc isn't always called */ | |
1942 | if (nfdset && SIZE_T_MAX / nfdset < sizeof(fd_mask)) | |
1943 | fatal("channel_prepare_select: max_fd (%d) is too large", n); | |
1944 | sz = nfdset * sizeof(fd_mask); | |
1945 | ||
489aa2e9 | 1946 | /* perhaps check sz < nalloc/2 and shrink? */ |
1947 | if (*readsetp == NULL || sz > *nallocp) { | |
c5d10563 | 1948 | *readsetp = xrealloc(*readsetp, nfdset, sizeof(fd_mask)); |
1949 | *writesetp = xrealloc(*writesetp, nfdset, sizeof(fd_mask)); | |
489aa2e9 | 1950 | *nallocp = sz; |
39929cdb | 1951 | } |
489aa2e9 | 1952 | *maxfdp = n; |
39929cdb | 1953 | memset(*readsetp, 0, sz); |
1954 | memset(*writesetp, 0, sz); | |
1955 | ||
c422989b | 1956 | if (!rekeying) |
1957 | channel_handler(channel_pre, *readsetp, *writesetp); | |
7368a6c8 | 1958 | } |
1959 | ||
8e7895b8 | 1960 | /* |
1961 | * After select, perform any appropriate operations for channels which have | |
1962 | * events pending. | |
1963 | */ | |
6ae2364d | 1964 | void |
c8e9c167 | 1965 | channel_after_select(fd_set *readset, fd_set *writeset) |
7368a6c8 | 1966 | { |
1967 | channel_handler(channel_post, readset, writeset); | |
1968 | } | |
1969 | ||
8e7895b8 | 1970 | |
39929cdb | 1971 | /* If there is data to send to the connection, enqueue some of it now. */ |
6ae2364d | 1972 | void |
d5bb9418 | 1973 | channel_output_poll(void) |
8efc0c15 | 1974 | { |
7368a6c8 | 1975 | Channel *c; |
9a995072 | 1976 | u_int i, len; |
5260325f | 1977 | |
1978 | for (i = 0; i < channels_alloc; i++) { | |
719fc62f | 1979 | c = channels[i]; |
1980 | if (c == NULL) | |
1981 | continue; | |
48e671d5 | 1982 | |
8e7895b8 | 1983 | /* |
1984 | * We are only interested in channels that can have buffered | |
1985 | * incoming data. | |
1986 | */ | |
48e671d5 | 1987 | if (compat13) { |
7368a6c8 | 1988 | if (c->type != SSH_CHANNEL_OPEN && |
1989 | c->type != SSH_CHANNEL_INPUT_DRAINING) | |
48e671d5 | 1990 | continue; |
1991 | } else { | |
7368a6c8 | 1992 | if (c->type != SSH_CHANNEL_OPEN) |
48e671d5 | 1993 | continue; |
48e671d5 | 1994 | } |
e78a59f5 | 1995 | if (compat20 && |
1996 | (c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) { | |
ee55dacf | 1997 | /* XXX is this true? */ |
418e724c | 1998 | debug3("channel %d: will not send data after close", c->self); |
7e7327a1 | 1999 | continue; |
2000 | } | |
5260325f | 2001 | |
2002 | /* Get the amount of buffered data for this channel. */ | |
ee55dacf | 2003 | if ((c->istate == CHAN_INPUT_OPEN || |
2004 | c->istate == CHAN_INPUT_WAIT_DRAIN) && | |
2005 | (len = buffer_len(&c->input)) > 0) { | |
d20f3c9e | 2006 | if (c->datagram) { |
2007 | if (len > 0) { | |
2008 | u_char *data; | |
2009 | u_int dlen; | |
2010 | ||
2011 | data = buffer_get_string(&c->input, | |
2012 | &dlen); | |
2013 | packet_start(SSH2_MSG_CHANNEL_DATA); | |
2014 | packet_put_int(c->remote_id); | |
2015 | packet_put_string(data, dlen); | |
2016 | packet_send(); | |
2017 | c->remote_window -= dlen + 4; | |
2018 | xfree(data); | |
2019 | } | |
2020 | continue; | |
2021 | } | |
8e7895b8 | 2022 | /* |
2023 | * Send some data for the other side over the secure | |
2024 | * connection. | |
2025 | */ | |
7e7327a1 | 2026 | if (compat20) { |
2027 | if (len > c->remote_window) | |
2028 | len = c->remote_window; | |
2029 | if (len > c->remote_maxpacket) | |
2030 | len = c->remote_maxpacket; | |
5260325f | 2031 | } else { |
7e7327a1 | 2032 | if (packet_is_interactive()) { |
2033 | if (len > 1024) | |
2034 | len = 512; | |
2035 | } else { | |
2036 | /* Keep the packets at reasonable size. */ | |
2037 | if (len > packet_get_maxsize()/2) | |
2038 | len = packet_get_maxsize()/2; | |
2039 | } | |
5260325f | 2040 | } |
7368a6c8 | 2041 | if (len > 0) { |
7e7327a1 | 2042 | packet_start(compat20 ? |
2043 | SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA); | |
7368a6c8 | 2044 | packet_put_int(c->remote_id); |
2045 | packet_put_string(buffer_ptr(&c->input), len); | |
2046 | packet_send(); | |
2047 | buffer_consume(&c->input, len); | |
2048 | c->remote_window -= len; | |
7368a6c8 | 2049 | } |
2050 | } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) { | |
5260325f | 2051 | if (compat13) |
2052 | fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3"); | |
aa3378df | 2053 | /* |
2054 | * input-buffer is empty and read-socket shutdown: | |
d2296ed7 | 2055 | * tell peer, that we will not send more data: send IEOF. |
2056 | * hack for extended data: delay EOF if EFD still in use. | |
aa3378df | 2057 | */ |
d2296ed7 | 2058 | if (CHANNEL_EFD_INPUT_ACTIVE(c)) |
4e2e5cfd | 2059 | debug2("channel %d: ibuf_empty delayed efd %d/(%d)", |
2060 | c->self, c->efd, buffer_len(&c->extended)); | |
d2296ed7 | 2061 | else |
2062 | chan_ibuf_empty(c); | |
5260325f | 2063 | } |
7e7327a1 | 2064 | /* Send extended data, i.e. stderr */ |
2065 | if (compat20 && | |
d2296ed7 | 2066 | !(c->flags & CHAN_EOF_SENT) && |
7e7327a1 | 2067 | c->remote_window > 0 && |
2068 | (len = buffer_len(&c->extended)) > 0 && | |
2069 | c->extended_usage == CHAN_EXTENDED_READ) { | |
f91d9a89 | 2070 | debug2("channel %d: rwin %u elen %u euse %d", |
ee55dacf | 2071 | c->self, c->remote_window, buffer_len(&c->extended), |
2072 | c->extended_usage); | |
7e7327a1 | 2073 | if (len > c->remote_window) |
2074 | len = c->remote_window; | |
2075 | if (len > c->remote_maxpacket) | |
2076 | len = c->remote_maxpacket; | |
2077 | packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA); | |
2078 | packet_put_int(c->remote_id); | |
2079 | packet_put_int(SSH2_EXTENDED_DATA_STDERR); | |
2080 | packet_put_string(buffer_ptr(&c->extended), len); | |
2081 | packet_send(); | |
2082 | buffer_consume(&c->extended, len); | |
2083 | c->remote_window -= len; | |
ee55dacf | 2084 | debug2("channel %d: sent ext data %d", c->self, len); |
7e7327a1 | 2085 | } |
8efc0c15 | 2086 | } |
8efc0c15 | 2087 | } |
2088 | ||
8e7895b8 | 2089 | |
2090 | /* -- protocol input */ | |
04aa9e67 | 2091 | |
2092 | /* ARGSUSED */ | |
6ae2364d | 2093 | void |
7819b5c3 | 2094 | channel_input_data(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2095 | { |
48e671d5 | 2096 | int id; |
5260325f | 2097 | char *data; |
1e3b8b07 | 2098 | u_int data_len; |
7368a6c8 | 2099 | Channel *c; |
5260325f | 2100 | |
2101 | /* Get the channel number and verify it. */ | |
48e671d5 | 2102 | id = packet_get_int(); |
7368a6c8 | 2103 | c = channel_lookup(id); |
2104 | if (c == NULL) | |
48e671d5 | 2105 | packet_disconnect("Received data for nonexistent channel %d.", id); |
5260325f | 2106 | |
2107 | /* Ignore any data for non-open channels (might happen on close) */ | |
7368a6c8 | 2108 | if (c->type != SSH_CHANNEL_OPEN && |
2109 | c->type != SSH_CHANNEL_X11_OPEN) | |
48e671d5 | 2110 | return; |
2111 | ||
5260325f | 2112 | /* Get the data. */ |
17f02f0a | 2113 | data = packet_get_string_ptr(&data_len); |
7368a6c8 | 2114 | |
7741e239 | 2115 | /* |
2116 | * Ignore data for protocol > 1.3 if output end is no longer open. | |
2117 | * For protocol 2 the sending side is reducing its window as it sends | |
2118 | * data, so we must 'fake' consumption of the data in order to ensure | |
2119 | * that window updates are sent back. Otherwise the connection might | |
2120 | * deadlock. | |
2121 | */ | |
2122 | if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN) { | |
2123 | if (compat20) { | |
2124 | c->local_window -= data_len; | |
2125 | c->local_consumed += data_len; | |
2126 | } | |
7741e239 | 2127 | return; |
2128 | } | |
2129 | ||
6aacefa7 | 2130 | if (compat20) { |
7e7327a1 | 2131 | if (data_len > c->local_maxpacket) { |
bbe88b6d | 2132 | logit("channel %d: rcvd big packet %d, maxpack %d", |
7e7327a1 | 2133 | c->self, data_len, c->local_maxpacket); |
2134 | } | |
2135 | if (data_len > c->local_window) { | |
bbe88b6d | 2136 | logit("channel %d: rcvd too much data %d, win %d", |
7e7327a1 | 2137 | c->self, data_len, c->local_window); |
7e7327a1 | 2138 | return; |
2139 | } | |
2140 | c->local_window -= data_len; | |
7e7327a1 | 2141 | } |
d20f3c9e | 2142 | if (c->datagram) |
2143 | buffer_put_string(&c->output, data, data_len); | |
2144 | else | |
2145 | buffer_append(&c->output, data, data_len); | |
17f02f0a | 2146 | packet_check_eom(); |
8efc0c15 | 2147 | } |
8e7895b8 | 2148 | |
04aa9e67 | 2149 | /* ARGSUSED */ |
6ae2364d | 2150 | void |
7819b5c3 | 2151 | channel_input_extended_data(int type, u_int32_t seq, void *ctxt) |
7e7327a1 | 2152 | { |
2153 | int id; | |
7e7327a1 | 2154 | char *data; |
a594fa74 | 2155 | u_int data_len, tcode; |
7e7327a1 | 2156 | Channel *c; |
2157 | ||
2158 | /* Get the channel number and verify it. */ | |
2159 | id = packet_get_int(); | |
2160 | c = channel_lookup(id); | |
2161 | ||
2162 | if (c == NULL) | |
2163 | packet_disconnect("Received extended_data for bad channel %d.", id); | |
2164 | if (c->type != SSH_CHANNEL_OPEN) { | |
bbe88b6d | 2165 | logit("channel %d: ext data for non open", id); |
7e7327a1 | 2166 | return; |
2167 | } | |
d2296ed7 | 2168 | if (c->flags & CHAN_EOF_RCVD) { |
2169 | if (datafellows & SSH_BUG_EXTEOF) | |
2170 | debug("channel %d: accepting ext data after eof", id); | |
2171 | else | |
2172 | packet_disconnect("Received extended_data after EOF " | |
2173 | "on channel %d.", id); | |
2174 | } | |
7e7327a1 | 2175 | tcode = packet_get_int(); |
2176 | if (c->efd == -1 || | |
2177 | c->extended_usage != CHAN_EXTENDED_WRITE || | |
2178 | tcode != SSH2_EXTENDED_DATA_STDERR) { | |
bbe88b6d | 2179 | logit("channel %d: bad ext data", c->self); |
7e7327a1 | 2180 | return; |
2181 | } | |
2182 | data = packet_get_string(&data_len); | |
95500969 | 2183 | packet_check_eom(); |
7e7327a1 | 2184 | if (data_len > c->local_window) { |
bbe88b6d | 2185 | logit("channel %d: rcvd too much extended_data %d, win %d", |
7e7327a1 | 2186 | c->self, data_len, c->local_window); |
2187 | xfree(data); | |
2188 | return; | |
2189 | } | |
de273eef | 2190 | debug2("channel %d: rcvd ext data %d", c->self, data_len); |
7e7327a1 | 2191 | c->local_window -= data_len; |
2192 | buffer_append(&c->extended, data, data_len); | |
2193 | xfree(data); | |
2194 | } | |
2195 | ||
04aa9e67 | 2196 | /* ARGSUSED */ |
6ae2364d | 2197 | void |
7819b5c3 | 2198 | channel_input_ieof(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 2199 | { |
2200 | int id; | |
2201 | Channel *c; | |
2202 | ||
7368a6c8 | 2203 | id = packet_get_int(); |
95500969 | 2204 | packet_check_eom(); |
7368a6c8 | 2205 | c = channel_lookup(id); |
2206 | if (c == NULL) | |
2207 | packet_disconnect("Received ieof for nonexistent channel %d.", id); | |
2208 | chan_rcvd_ieof(c); | |
a5f82435 | 2209 | |
2210 | /* XXX force input close */ | |
8341f420 | 2211 | if (c->force_drain && c->istate == CHAN_INPUT_OPEN) { |
a5f82435 | 2212 | debug("channel %d: FORCE input drain", c->self); |
2213 | c->istate = CHAN_INPUT_WAIT_DRAIN; | |
32e7d71f | 2214 | if (buffer_len(&c->input) == 0) |
2215 | chan_ibuf_empty(c); | |
a5f82435 | 2216 | } |
2217 | ||
7368a6c8 | 2218 | } |
8efc0c15 | 2219 | |
04aa9e67 | 2220 | /* ARGSUSED */ |
6ae2364d | 2221 | void |
7819b5c3 | 2222 | channel_input_close(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2223 | { |
7368a6c8 | 2224 | int id; |
2225 | Channel *c; | |
5260325f | 2226 | |
7368a6c8 | 2227 | id = packet_get_int(); |
95500969 | 2228 | packet_check_eom(); |
7368a6c8 | 2229 | c = channel_lookup(id); |
2230 | if (c == NULL) | |
2231 | packet_disconnect("Received close for nonexistent channel %d.", id); | |
aa3378df | 2232 | |
2233 | /* | |
2234 | * Send a confirmation that we have closed the channel and no more | |
2235 | * data is coming for it. | |
2236 | */ | |
5260325f | 2237 | packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION); |
7368a6c8 | 2238 | packet_put_int(c->remote_id); |
5260325f | 2239 | packet_send(); |
2240 | ||
aa3378df | 2241 | /* |
2242 | * If the channel is in closed state, we have sent a close request, | |
2243 | * and the other side will eventually respond with a confirmation. | |
2244 | * Thus, we cannot free the channel here, because then there would be | |
2245 | * no-one to receive the confirmation. The channel gets freed when | |
2246 | * the confirmation arrives. | |
2247 | */ | |
7368a6c8 | 2248 | if (c->type != SSH_CHANNEL_CLOSED) { |
aa3378df | 2249 | /* |
2250 | * Not a closed channel - mark it as draining, which will | |
2251 | * cause it to be freed later. | |
2252 | */ | |
9c50edcf | 2253 | buffer_clear(&c->input); |
7368a6c8 | 2254 | c->type = SSH_CHANNEL_OUTPUT_DRAINING; |
5260325f | 2255 | } |
8efc0c15 | 2256 | } |
2257 | ||
7368a6c8 | 2258 | /* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */ |
04aa9e67 | 2259 | /* ARGSUSED */ |
6ae2364d | 2260 | void |
7819b5c3 | 2261 | channel_input_oclose(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2262 | { |
7368a6c8 | 2263 | int id = packet_get_int(); |
2264 | Channel *c = channel_lookup(id); | |
a8a21a53 | 2265 | |
95500969 | 2266 | packet_check_eom(); |
7368a6c8 | 2267 | if (c == NULL) |
2268 | packet_disconnect("Received oclose for nonexistent channel %d.", id); | |
2269 | chan_rcvd_oclose(c); | |
8efc0c15 | 2270 | } |
2271 | ||
04aa9e67 | 2272 | /* ARGSUSED */ |
6ae2364d | 2273 | void |
7819b5c3 | 2274 | channel_input_close_confirmation(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 2275 | { |
2276 | int id = packet_get_int(); | |
2277 | Channel *c = channel_lookup(id); | |
2278 | ||
95500969 | 2279 | packet_check_eom(); |
7368a6c8 | 2280 | if (c == NULL) |
2281 | packet_disconnect("Received close confirmation for " | |
2282 | "out-of-range channel %d.", id); | |
2283 | if (c->type != SSH_CHANNEL_CLOSED) | |
2284 | packet_disconnect("Received close confirmation for " | |
2285 | "non-closed channel %d (type %d).", id, c->type); | |
719fc62f | 2286 | channel_free(c); |
7368a6c8 | 2287 | } |
8efc0c15 | 2288 | |
04aa9e67 | 2289 | /* ARGSUSED */ |
6ae2364d | 2290 | void |
7819b5c3 | 2291 | channel_input_open_confirmation(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2292 | { |
7368a6c8 | 2293 | int id, remote_id; |
2294 | Channel *c; | |
5260325f | 2295 | |
7368a6c8 | 2296 | id = packet_get_int(); |
2297 | c = channel_lookup(id); | |
5260325f | 2298 | |
7368a6c8 | 2299 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) |
2300 | packet_disconnect("Received open confirmation for " | |
2301 | "non-opening channel %d.", id); | |
2302 | remote_id = packet_get_int(); | |
aa3378df | 2303 | /* Record the remote channel number and mark that the channel is now open. */ |
7368a6c8 | 2304 | c->remote_id = remote_id; |
2305 | c->type = SSH_CHANNEL_OPEN; | |
7e7327a1 | 2306 | |
2307 | if (compat20) { | |
2308 | c->remote_window = packet_get_int(); | |
2309 | c->remote_maxpacket = packet_get_int(); | |
3593bdc0 | 2310 | if (c->open_confirm) { |
de273eef | 2311 | debug2("callback start"); |
3593bdc0 | 2312 | c->open_confirm(c->self, c->open_confirm_ctx); |
de273eef | 2313 | debug2("callback done"); |
7e7327a1 | 2314 | } |
d7ac5f18 | 2315 | debug2("channel %d: open confirm rwindow %u rmax %u", c->self, |
7e7327a1 | 2316 | c->remote_window, c->remote_maxpacket); |
2317 | } | |
95500969 | 2318 | packet_check_eom(); |
8efc0c15 | 2319 | } |
2320 | ||
396c147e | 2321 | static char * |
d18e0850 | 2322 | reason2txt(int reason) |
2323 | { | |
6aacefa7 | 2324 | switch (reason) { |
d18e0850 | 2325 | case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED: |
2326 | return "administratively prohibited"; | |
2327 | case SSH2_OPEN_CONNECT_FAILED: | |
2328 | return "connect failed"; | |
2329 | case SSH2_OPEN_UNKNOWN_CHANNEL_TYPE: | |
2330 | return "unknown channel type"; | |
2331 | case SSH2_OPEN_RESOURCE_SHORTAGE: | |
2332 | return "resource shortage"; | |
2333 | } | |
7e8c18e9 | 2334 | return "unknown reason"; |
d18e0850 | 2335 | } |
2336 | ||
04aa9e67 | 2337 | /* ARGSUSED */ |
6ae2364d | 2338 | void |
7819b5c3 | 2339 | channel_input_open_failure(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2340 | { |
02a024dd | 2341 | int id, reason; |
2342 | char *msg = NULL, *lang = NULL; | |
7368a6c8 | 2343 | Channel *c; |
5260325f | 2344 | |
7368a6c8 | 2345 | id = packet_get_int(); |
2346 | c = channel_lookup(id); | |
2347 | ||
2348 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) | |
2349 | packet_disconnect("Received open failure for " | |
2350 | "non-opening channel %d.", id); | |
7e7327a1 | 2351 | if (compat20) { |
02a024dd | 2352 | reason = packet_get_int(); |
fbe90f7b | 2353 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { |
02a024dd | 2354 | msg = packet_get_string(NULL); |
2355 | lang = packet_get_string(NULL); | |
2356 | } | |
bbe88b6d | 2357 | logit("channel %d: open failed: %s%s%s", id, |
d18e0850 | 2358 | reason2txt(reason), msg ? ": ": "", msg ? msg : ""); |
02a024dd | 2359 | if (msg != NULL) |
2360 | xfree(msg); | |
2361 | if (lang != NULL) | |
2362 | xfree(lang); | |
7e7327a1 | 2363 | } |
95500969 | 2364 | packet_check_eom(); |
6cf44b6a | 2365 | /* Schedule the channel for cleanup/deletion. */ |
2366 | chan_mark_dead(c); | |
8efc0c15 | 2367 | } |
2368 | ||
04aa9e67 | 2369 | /* ARGSUSED */ |
8e7895b8 | 2370 | void |
7819b5c3 | 2371 | channel_input_window_adjust(int type, u_int32_t seq, void *ctxt) |
8e7895b8 | 2372 | { |
2373 | Channel *c; | |
f91d9a89 | 2374 | int id; |
2375 | u_int adjust; | |
3ffc6336 | 2376 | |
8e7895b8 | 2377 | if (!compat20) |
2378 | return; | |
8efc0c15 | 2379 | |
8e7895b8 | 2380 | /* Get the channel number and verify it. */ |
2381 | id = packet_get_int(); | |
2382 | c = channel_lookup(id); | |
2383 | ||
b872f7f0 | 2384 | if (c == NULL) { |
2385 | logit("Received window adjust for non-open channel %d.", id); | |
8e7895b8 | 2386 | return; |
2387 | } | |
2388 | adjust = packet_get_int(); | |
95500969 | 2389 | packet_check_eom(); |
f91d9a89 | 2390 | debug2("channel %d: rcvd adjust %u", id, adjust); |
8e7895b8 | 2391 | c->remote_window += adjust; |
2392 | } | |
2393 | ||
04aa9e67 | 2394 | /* ARGSUSED */ |
8e7895b8 | 2395 | void |
7819b5c3 | 2396 | channel_input_port_open(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2397 | { |
8e7895b8 | 2398 | Channel *c = NULL; |
2399 | u_short host_port; | |
2400 | char *host, *originator_string; | |
e07e21ad | 2401 | int remote_id; |
5260325f | 2402 | |
8e7895b8 | 2403 | remote_id = packet_get_int(); |
2404 | host = packet_get_string(NULL); | |
2405 | host_port = packet_get_int(); | |
2406 | ||
2407 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) { | |
2408 | originator_string = packet_get_string(NULL); | |
2409 | } else { | |
2410 | originator_string = xstrdup("unknown (remote did not supply name)"); | |
2411 | } | |
95500969 | 2412 | packet_check_eom(); |
e07e21ad | 2413 | c = channel_connect_to(host, host_port, |
2414 | "connected socket", originator_string); | |
0d942eff | 2415 | xfree(originator_string); |
e07e21ad | 2416 | xfree(host); |
8e7895b8 | 2417 | if (c == NULL) { |
2418 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
2419 | packet_put_int(remote_id); | |
2420 | packet_send(); | |
e07e21ad | 2421 | } else |
2422 | c->remote_id = remote_id; | |
8efc0c15 | 2423 | } |
2424 | ||
3593bdc0 | 2425 | /* ARGSUSED */ |
2426 | void | |
2427 | channel_input_status_confirm(int type, u_int32_t seq, void *ctxt) | |
2428 | { | |
2429 | Channel *c; | |
2430 | struct channel_confirm *cc; | |
b09b559d | 2431 | int id; |
3593bdc0 | 2432 | |
2433 | /* Reset keepalive timeout */ | |
dc1f1948 | 2434 | packet_set_alive_timeouts(0); |
3593bdc0 | 2435 | |
b09b559d | 2436 | id = packet_get_int(); |
3593bdc0 | 2437 | packet_check_eom(); |
2438 | ||
b09b559d | 2439 | debug2("channel_input_status_confirm: type %d id %d", type, id); |
3593bdc0 | 2440 | |
b09b559d | 2441 | if ((c = channel_lookup(id)) == NULL) { |
2442 | logit("channel_input_status_confirm: %d: unknown", id); | |
3593bdc0 | 2443 | return; |
2444 | } | |
2445 | ; | |
2446 | if ((cc = TAILQ_FIRST(&c->status_confirms)) == NULL) | |
2447 | return; | |
2448 | cc->cb(type, c, cc->ctx); | |
2449 | TAILQ_REMOVE(&c->status_confirms, cc, entry); | |
2450 | bzero(cc, sizeof(*cc)); | |
2451 | xfree(cc); | |
2452 | } | |
8e7895b8 | 2453 | |
2454 | /* -- tcp forwarding */ | |
2455 | ||
5e4a7219 | 2456 | void |
2457 | channel_set_af(int af) | |
2458 | { | |
2459 | IPv4or6 = af; | |
2460 | } | |
2461 | ||
5641aefa | 2462 | static int |
17525a70 | 2463 | channel_setup_fwd_listener(int type, const char *listen_addr, |
2464 | u_short listen_port, int *allocated_listen_port, | |
5641aefa | 2465 | const char *host_to_connect, u_short port_to_connect, int gateway_ports) |
8efc0c15 | 2466 | { |
719fc62f | 2467 | Channel *c; |
442aee3a | 2468 | int sock, r, success = 0, wildcard = 0, is_client; |
48e671d5 | 2469 | struct addrinfo hints, *ai, *aitop; |
3867aa0a | 2470 | const char *host, *addr; |
5641aefa | 2471 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
17525a70 | 2472 | in_port_t *lport_p; |
5260325f | 2473 | |
5641aefa | 2474 | host = (type == SSH_CHANNEL_RPORT_LISTENER) ? |
2475 | listen_addr : host_to_connect; | |
3867aa0a | 2476 | is_client = (type == SSH_CHANNEL_PORT_LISTENER); |
02a024dd | 2477 | |
5641aefa | 2478 | if (host == NULL) { |
2479 | error("No forward host name."); | |
38946c65 | 2480 | return 0; |
fa08c86b | 2481 | } |
920706fd | 2482 | if (strlen(host) >= NI_MAXHOST) { |
02a024dd | 2483 | error("Forward host name too long."); |
38946c65 | 2484 | return 0; |
02a024dd | 2485 | } |
5260325f | 2486 | |
3867aa0a | 2487 | /* |
2488 | * Determine whether or not a port forward listens to loopback, | |
f8cc7664 | 2489 | * specified address or wildcard. On the client, a specified bind |
2490 | * address will always override gateway_ports. On the server, a | |
2491 | * gateway_ports of 1 (``yes'') will override the client's | |
2492 | * specification and force a wildcard bind, whereas a value of 2 | |
2493 | * (``clientspecified'') will bind to whatever address the client | |
3867aa0a | 2494 | * asked for. |
2495 | * | |
2496 | * Special-case listen_addrs are: | |
2497 | * | |
2498 | * "0.0.0.0" -> wildcard v4/v6 if SSH_OLD_FORWARD_ADDR | |
2499 | * "" (empty string), "*" -> wildcard v4/v6 | |
2500 | * "localhost" -> loopback v4/v6 | |
2501 | */ | |
2502 | addr = NULL; | |
2503 | if (listen_addr == NULL) { | |
2504 | /* No address specified: default to gateway_ports setting */ | |
2505 | if (gateway_ports) | |
2506 | wildcard = 1; | |
2507 | } else if (gateway_ports || is_client) { | |
2508 | if (((datafellows & SSH_OLD_FORWARD_ADDR) && | |
bc4cc956 | 2509 | strcmp(listen_addr, "0.0.0.0") == 0 && is_client == 0) || |
3867aa0a | 2510 | *listen_addr == '\0' || strcmp(listen_addr, "*") == 0 || |
2511 | (!is_client && gateway_ports == 1)) | |
2512 | wildcard = 1; | |
2513 | else if (strcmp(listen_addr, "localhost") != 0) | |
2514 | addr = listen_addr; | |
2515 | } | |
2516 | ||
2517 | debug3("channel_setup_fwd_listener: type %d wildcard %d addr %s", | |
2518 | type, wildcard, (addr == NULL) ? "NULL" : addr); | |
2519 | ||
aa3378df | 2520 | /* |
48e671d5 | 2521 | * getaddrinfo returns a loopback address if the hostname is |
2522 | * set to NULL and hints.ai_flags is not AI_PASSIVE | |
aa3378df | 2523 | */ |
48e671d5 | 2524 | memset(&hints, 0, sizeof(hints)); |
2525 | hints.ai_family = IPv4or6; | |
3867aa0a | 2526 | hints.ai_flags = wildcard ? AI_PASSIVE : 0; |
48e671d5 | 2527 | hints.ai_socktype = SOCK_STREAM; |
fa08c86b | 2528 | snprintf(strport, sizeof strport, "%d", listen_port); |
3867aa0a | 2529 | if ((r = getaddrinfo(addr, strport, &hints, &aitop)) != 0) { |
2530 | if (addr == NULL) { | |
2531 | /* This really shouldn't happen */ | |
2532 | packet_disconnect("getaddrinfo: fatal error: %s", | |
bb4626fe | 2533 | ssh_gai_strerror(r)); |
3867aa0a | 2534 | } else { |
38946c65 | 2535 | error("channel_setup_fwd_listener: " |
bb4626fe | 2536 | "getaddrinfo(%.64s): %s", addr, |
2537 | ssh_gai_strerror(r)); | |
3867aa0a | 2538 | } |
38946c65 | 2539 | return 0; |
3867aa0a | 2540 | } |
17525a70 | 2541 | if (allocated_listen_port != NULL) |
2542 | *allocated_listen_port = 0; | |
48e671d5 | 2543 | for (ai = aitop; ai; ai = ai->ai_next) { |
17525a70 | 2544 | switch (ai->ai_family) { |
2545 | case AF_INET: | |
2546 | lport_p = &((struct sockaddr_in *)ai->ai_addr)-> | |
2547 | sin_port; | |
2548 | break; | |
2549 | case AF_INET6: | |
2550 | lport_p = &((struct sockaddr_in6 *)ai->ai_addr)-> | |
2551 | sin6_port; | |
2552 | break; | |
2553 | default: | |
48e671d5 | 2554 | continue; |
17525a70 | 2555 | } |
2556 | /* | |
2557 | * If allocating a port for -R forwards, then use the | |
2558 | * same port for all address families. | |
2559 | */ | |
2560 | if (type == SSH_CHANNEL_RPORT_LISTENER && listen_port == 0 && | |
2561 | allocated_listen_port != NULL && *allocated_listen_port > 0) | |
2562 | *lport_p = htons(*allocated_listen_port); | |
2563 | ||
48e671d5 | 2564 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), |
2565 | strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { | |
5641aefa | 2566 | error("channel_setup_fwd_listener: getnameinfo failed"); |
48e671d5 | 2567 | continue; |
2568 | } | |
2569 | /* Create a port to listen for the host. */ | |
3e131a6d | 2570 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
48e671d5 | 2571 | if (sock < 0) { |
2572 | /* this is no error since kernel may not support ipv6 */ | |
2573 | verbose("socket: %.100s", strerror(errno)); | |
2574 | continue; | |
2575 | } | |
442aee3a | 2576 | |
2577 | channel_set_reuseaddr(sock); | |
facfd613 | 2578 | |
17525a70 | 2579 | debug("Local forwarding listening on %s port %s.", |
2580 | ntop, strport); | |
48e671d5 | 2581 | |
2582 | /* Bind the socket to the address. */ | |
2583 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { | |
2584 | /* address can be in use ipv6 address is already bound */ | |
16218745 | 2585 | if (!ai->ai_next) |
2586 | error("bind: %.100s", strerror(errno)); | |
2587 | else | |
2588 | verbose("bind: %.100s", strerror(errno)); | |
2b87da3b | 2589 | |
48e671d5 | 2590 | close(sock); |
2591 | continue; | |
2592 | } | |
2593 | /* Start listening for connections on the socket. */ | |
fce39749 | 2594 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { |
48e671d5 | 2595 | error("listen: %.100s", strerror(errno)); |
2596 | close(sock); | |
2597 | continue; | |
2598 | } | |
17525a70 | 2599 | |
2600 | /* | |
2601 | * listen_port == 0 requests a dynamically allocated port - | |
2602 | * record what we got. | |
2603 | */ | |
2604 | if (type == SSH_CHANNEL_RPORT_LISTENER && listen_port == 0 && | |
2605 | allocated_listen_port != NULL && | |
2606 | *allocated_listen_port == 0) { | |
2607 | *allocated_listen_port = get_sock_port(sock, 1); | |
2608 | debug("Allocated listen port %d", | |
2609 | *allocated_listen_port); | |
2610 | } | |
2611 | ||
48e671d5 | 2612 | /* Allocate a channel number for the socket. */ |
8e7895b8 | 2613 | c = channel_new("port listener", type, sock, sock, -1, |
0b242b12 | 2614 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, |
0d942eff | 2615 | 0, "port listener", 1); |
1338ba77 | 2616 | c->path = xstrdup(host); |
719fc62f | 2617 | c->host_port = port_to_connect; |
2618 | c->listening_port = listen_port; | |
48e671d5 | 2619 | success = 1; |
2620 | } | |
2621 | if (success == 0) | |
5641aefa | 2622 | error("channel_setup_fwd_listener: cannot listen to port: %d", |
02a024dd | 2623 | listen_port); |
48e671d5 | 2624 | freeaddrinfo(aitop); |
02a024dd | 2625 | return success; |
5260325f | 2626 | } |
8efc0c15 | 2627 | |
d740ec16 | 2628 | int |
2629 | channel_cancel_rport_listener(const char *host, u_short port) | |
2630 | { | |
9a995072 | 2631 | u_int i; |
2632 | int found = 0; | |
d740ec16 | 2633 | |
f8cc7664 | 2634 | for (i = 0; i < channels_alloc; i++) { |
d740ec16 | 2635 | Channel *c = channels[i]; |
2636 | ||
2637 | if (c != NULL && c->type == SSH_CHANNEL_RPORT_LISTENER && | |
1338ba77 | 2638 | strcmp(c->path, host) == 0 && c->listening_port == port) { |
2912cbd6 | 2639 | debug2("%s: close channel %d", __func__, i); |
d740ec16 | 2640 | channel_free(c); |
2641 | found = 1; | |
2642 | } | |
2643 | } | |
2644 | ||
2645 | return (found); | |
2646 | } | |
2647 | ||
5641aefa | 2648 | /* protocol local port fwd, used by ssh (and sshd in v1) */ |
2649 | int | |
3867aa0a | 2650 | channel_setup_local_fwd_listener(const char *listen_host, u_short listen_port, |
5641aefa | 2651 | const char *host_to_connect, u_short port_to_connect, int gateway_ports) |
2652 | { | |
2653 | return channel_setup_fwd_listener(SSH_CHANNEL_PORT_LISTENER, | |
17525a70 | 2654 | listen_host, listen_port, NULL, host_to_connect, port_to_connect, |
3867aa0a | 2655 | gateway_ports); |
5641aefa | 2656 | } |
2657 | ||
2658 | /* protocol v2 remote port fwd, used by sshd */ | |
2659 | int | |
2660 | channel_setup_remote_fwd_listener(const char *listen_address, | |
17525a70 | 2661 | u_short listen_port, int *allocated_listen_port, int gateway_ports) |
5641aefa | 2662 | { |
2663 | return channel_setup_fwd_listener(SSH_CHANNEL_RPORT_LISTENER, | |
17525a70 | 2664 | listen_address, listen_port, allocated_listen_port, |
2665 | NULL, 0, gateway_ports); | |
5641aefa | 2666 | } |
2667 | ||
aa3378df | 2668 | /* |
2669 | * Initiate forwarding of connections to port "port" on remote host through | |
2670 | * the secure channel to host:port from local side. | |
2671 | */ | |
8efc0c15 | 2672 | |
42ea6f5e | 2673 | int |
3867aa0a | 2674 | channel_request_remote_forwarding(const char *listen_host, u_short listen_port, |
fa08c86b | 2675 | const char *host_to_connect, u_short port_to_connect) |
8efc0c15 | 2676 | { |
54a5250f | 2677 | int type, success = 0; |
fa08c86b | 2678 | |
5260325f | 2679 | /* Record locally that connection to this host/port is permitted. */ |
2680 | if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
2681 | fatal("channel_request_remote_forwarding: too many forwards"); | |
2682 | ||
5260325f | 2683 | /* Send the forward request to the remote side. */ |
7e7327a1 | 2684 | if (compat20) { |
3867aa0a | 2685 | const char *address_to_bind; |
04efe9b0 | 2686 | if (listen_host == NULL) { |
2687 | if (datafellows & SSH_BUG_RFWD_ADDR) | |
2688 | address_to_bind = "127.0.0.1"; | |
2689 | else | |
2690 | address_to_bind = "localhost"; | |
2691 | } else if (*listen_host == '\0' || | |
2692 | strcmp(listen_host, "*") == 0) { | |
2693 | if (datafellows & SSH_BUG_RFWD_ADDR) | |
2694 | address_to_bind = "0.0.0.0"; | |
2695 | else | |
2696 | address_to_bind = ""; | |
2697 | } else | |
3867aa0a | 2698 | address_to_bind = listen_host; |
2699 | ||
7e7327a1 | 2700 | packet_start(SSH2_MSG_GLOBAL_REQUEST); |
2701 | packet_put_cstring("tcpip-forward"); | |
e0ae8728 | 2702 | packet_put_char(1); /* boolean: want reply */ |
7e7327a1 | 2703 | packet_put_cstring(address_to_bind); |
2704 | packet_put_int(listen_port); | |
fa08c86b | 2705 | packet_send(); |
2706 | packet_write_wait(); | |
2707 | /* Assume that server accepts the request */ | |
2708 | success = 1; | |
7e7327a1 | 2709 | } else { |
2710 | packet_start(SSH_CMSG_PORT_FORWARD_REQUEST); | |
7e7327a1 | 2711 | packet_put_int(listen_port); |
d6f24e45 | 2712 | packet_put_cstring(host_to_connect); |
2713 | packet_put_int(port_to_connect); | |
7e7327a1 | 2714 | packet_send(); |
2715 | packet_write_wait(); | |
fa08c86b | 2716 | |
2717 | /* Wait for response from the remote side. */ | |
54a5250f | 2718 | type = packet_read(); |
fa08c86b | 2719 | switch (type) { |
2720 | case SSH_SMSG_SUCCESS: | |
2721 | success = 1; | |
2722 | break; | |
2723 | case SSH_SMSG_FAILURE: | |
fa08c86b | 2724 | break; |
2725 | default: | |
2726 | /* Unknown packet */ | |
2727 | packet_disconnect("Protocol error for port forward request:" | |
2728 | "received packet type %d.", type); | |
2729 | } | |
2730 | } | |
2731 | if (success) { | |
2732 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host_to_connect); | |
2733 | permitted_opens[num_permitted_opens].port_to_connect = port_to_connect; | |
2734 | permitted_opens[num_permitted_opens].listen_port = listen_port; | |
2735 | num_permitted_opens++; | |
7e7327a1 | 2736 | } |
42ea6f5e | 2737 | return (success ? 0 : -1); |
8efc0c15 | 2738 | } |
2739 | ||
d740ec16 | 2740 | /* |
f2107e97 | 2741 | * Request cancellation of remote forwarding of connection host:port from |
d740ec16 | 2742 | * local side. |
2743 | */ | |
d740ec16 | 2744 | void |
3867aa0a | 2745 | channel_request_rforward_cancel(const char *host, u_short port) |
d740ec16 | 2746 | { |
2747 | int i; | |
d740ec16 | 2748 | |
2749 | if (!compat20) | |
2750 | return; | |
2751 | ||
2752 | for (i = 0; i < num_permitted_opens; i++) { | |
f2107e97 | 2753 | if (permitted_opens[i].host_to_connect != NULL && |
d740ec16 | 2754 | permitted_opens[i].listen_port == port) |
2755 | break; | |
2756 | } | |
2757 | if (i >= num_permitted_opens) { | |
2758 | debug("%s: requested forward not found", __func__); | |
2759 | return; | |
2760 | } | |
2761 | packet_start(SSH2_MSG_GLOBAL_REQUEST); | |
2762 | packet_put_cstring("cancel-tcpip-forward"); | |
2763 | packet_put_char(0); | |
3867aa0a | 2764 | packet_put_cstring(host == NULL ? "" : host); |
d740ec16 | 2765 | packet_put_int(port); |
2766 | packet_send(); | |
2767 | ||
2768 | permitted_opens[i].listen_port = 0; | |
2769 | permitted_opens[i].port_to_connect = 0; | |
8c4bd764 | 2770 | xfree(permitted_opens[i].host_to_connect); |
d740ec16 | 2771 | permitted_opens[i].host_to_connect = NULL; |
2772 | } | |
2773 | ||
aa3378df | 2774 | /* |
2775 | * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates | |
2776 | * listening for the port, and sends back a success reply (or disconnect | |
42ea6f5e | 2777 | * message if there was an error). |
aa3378df | 2778 | */ |
42ea6f5e | 2779 | int |
1d1ffb87 | 2780 | channel_input_port_forward_request(int is_root, int gateway_ports) |
8efc0c15 | 2781 | { |
57112b5a | 2782 | u_short port, host_port; |
42ea6f5e | 2783 | int success = 0; |
5260325f | 2784 | char *hostname; |
2785 | ||
2786 | /* Get arguments from the packet. */ | |
2787 | port = packet_get_int(); | |
2788 | hostname = packet_get_string(NULL); | |
2789 | host_port = packet_get_int(); | |
2790 | ||
3c62e7eb | 2791 | #ifndef HAVE_CYGWIN |
aa3378df | 2792 | /* |
2793 | * Check that an unprivileged user is not trying to forward a | |
2794 | * privileged port. | |
2795 | */ | |
5260325f | 2796 | if (port < IPPORT_RESERVED && !is_root) |
8e7c9afc | 2797 | packet_disconnect( |
2798 | "Requested forwarding of port %d but user is not root.", | |
2799 | port); | |
2800 | if (host_port == 0) | |
2801 | packet_disconnect("Dynamic forwarding denied."); | |
3c62e7eb | 2802 | #endif |
8e7c9afc | 2803 | |
fa08c86b | 2804 | /* Initiate forwarding */ |
42ea6f5e | 2805 | success = channel_setup_local_fwd_listener(NULL, port, hostname, |
3867aa0a | 2806 | host_port, gateway_ports); |
5260325f | 2807 | |
2808 | /* Free the argument string. */ | |
2809 | xfree(hostname); | |
42ea6f5e | 2810 | |
2811 | return (success ? 0 : -1); | |
8efc0c15 | 2812 | } |
2813 | ||
01794848 | 2814 | /* |
2815 | * Permits opening to any host/port if permitted_opens[] is empty. This is | |
2816 | * usually called by the server, because the user could connect to any port | |
2817 | * anyway, and the server has no way to know but to trust the client anyway. | |
2818 | */ | |
2819 | void | |
d5bb9418 | 2820 | channel_permit_all_opens(void) |
01794848 | 2821 | { |
2822 | if (num_permitted_opens == 0) | |
2823 | all_opens_permitted = 1; | |
2824 | } | |
2825 | ||
cd332296 | 2826 | void |
01794848 | 2827 | channel_add_permitted_opens(char *host, int port) |
2828 | { | |
2829 | if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
42ea6f5e | 2830 | fatal("channel_add_permitted_opens: too many forwards"); |
01794848 | 2831 | debug("allow port forwarding to host %s port %d", host, port); |
2832 | ||
2833 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host); | |
2834 | permitted_opens[num_permitted_opens].port_to_connect = port; | |
2835 | num_permitted_opens++; | |
2836 | ||
2837 | all_opens_permitted = 0; | |
2838 | } | |
2839 | ||
ea46e550 | 2840 | int |
2fefbadf | 2841 | channel_add_adm_permitted_opens(char *host, int port) |
2842 | { | |
2843 | if (num_adm_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
2844 | fatal("channel_add_adm_permitted_opens: too many forwards"); | |
ea46e550 | 2845 | debug("config allows port forwarding to host %s port %d", host, port); |
2fefbadf | 2846 | |
2847 | permitted_adm_opens[num_adm_permitted_opens].host_to_connect | |
2848 | = xstrdup(host); | |
2849 | permitted_adm_opens[num_adm_permitted_opens].port_to_connect = port; | |
ea46e550 | 2850 | return ++num_adm_permitted_opens; |
2fefbadf | 2851 | } |
2852 | ||
cd332296 | 2853 | void |
01794848 | 2854 | channel_clear_permitted_opens(void) |
2855 | { | |
2856 | int i; | |
2857 | ||
2858 | for (i = 0; i < num_permitted_opens; i++) | |
d740ec16 | 2859 | if (permitted_opens[i].host_to_connect != NULL) |
2860 | xfree(permitted_opens[i].host_to_connect); | |
01794848 | 2861 | num_permitted_opens = 0; |
2fefbadf | 2862 | } |
2863 | ||
2864 | void | |
2865 | channel_clear_adm_permitted_opens(void) | |
2866 | { | |
2867 | int i; | |
01794848 | 2868 | |
2fefbadf | 2869 | for (i = 0; i < num_adm_permitted_opens; i++) |
2870 | if (permitted_adm_opens[i].host_to_connect != NULL) | |
2871 | xfree(permitted_adm_opens[i].host_to_connect); | |
2872 | num_adm_permitted_opens = 0; | |
01794848 | 2873 | } |
2874 | ||
1760c982 | 2875 | void |
2876 | channel_print_adm_permitted_opens(void) | |
2877 | { | |
cdfbc829 | 2878 | int i; |
1760c982 | 2879 | |
68405671 | 2880 | printf("permitopen"); |
861e9e53 | 2881 | if (num_adm_permitted_opens == 0) { |
68405671 | 2882 | printf(" any\n"); |
861e9e53 | 2883 | return; |
2884 | } | |
1760c982 | 2885 | for (i = 0; i < num_adm_permitted_opens; i++) |
2886 | if (permitted_adm_opens[i].host_to_connect != NULL) | |
2887 | printf(" %s:%d", permitted_adm_opens[i].host_to_connect, | |
2888 | permitted_adm_opens[i].port_to_connect); | |
68405671 | 2889 | printf("\n"); |
1760c982 | 2890 | } |
2891 | ||
e07e21ad | 2892 | /* Try to start non-blocking connect to next host in cctx list */ |
396c147e | 2893 | static int |
e07e21ad | 2894 | connect_next(struct channel_connect *cctx) |
8efc0c15 | 2895 | { |
e07e21ad | 2896 | int sock, saved_errno; |
48e671d5 | 2897 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
48e671d5 | 2898 | |
e07e21ad | 2899 | for (; cctx->ai; cctx->ai = cctx->ai->ai_next) { |
2900 | if (cctx->ai->ai_family != AF_INET && | |
2901 | cctx->ai->ai_family != AF_INET6) | |
48e671d5 | 2902 | continue; |
e07e21ad | 2903 | if (getnameinfo(cctx->ai->ai_addr, cctx->ai->ai_addrlen, |
2904 | ntop, sizeof(ntop), strport, sizeof(strport), | |
2905 | NI_NUMERICHOST|NI_NUMERICSERV) != 0) { | |
2906 | error("connect_next: getnameinfo failed"); | |
48e671d5 | 2907 | continue; |
5260325f | 2908 | } |
e07e21ad | 2909 | if ((sock = socket(cctx->ai->ai_family, cctx->ai->ai_socktype, |
2910 | cctx->ai->ai_protocol)) == -1) { | |
2911 | if (cctx->ai->ai_next == NULL) | |
4940c411 | 2912 | error("socket: %.100s", strerror(errno)); |
2913 | else | |
2914 | verbose("socket: %.100s", strerror(errno)); | |
48e671d5 | 2915 | continue; |
5260325f | 2916 | } |
170694d7 | 2917 | if (set_nonblock(sock) == -1) |
2918 | fatal("%s: set_nonblock(%d)", __func__, sock); | |
e07e21ad | 2919 | if (connect(sock, cctx->ai->ai_addr, |
2920 | cctx->ai->ai_addrlen) == -1 && errno != EINPROGRESS) { | |
2921 | debug("connect_next: host %.100s ([%.100s]:%s): " | |
2922 | "%.100s", cctx->host, ntop, strport, | |
48e671d5 | 2923 | strerror(errno)); |
e07e21ad | 2924 | saved_errno = errno; |
48e671d5 | 2925 | close(sock); |
e07e21ad | 2926 | errno = saved_errno; |
2b87da3b | 2927 | continue; /* fail -- try next */ |
48e671d5 | 2928 | } |
e07e21ad | 2929 | debug("connect_next: host %.100s ([%.100s]:%s) " |
2930 | "in progress, fd=%d", cctx->host, ntop, strport, sock); | |
2931 | cctx->ai = cctx->ai->ai_next; | |
2932 | set_nodelay(sock); | |
2933 | return sock; | |
2934 | } | |
2935 | return -1; | |
2936 | } | |
2937 | ||
2938 | static void | |
2939 | channel_connect_ctx_free(struct channel_connect *cctx) | |
2940 | { | |
2941 | xfree(cctx->host); | |
2942 | if (cctx->aitop) | |
2943 | freeaddrinfo(cctx->aitop); | |
2944 | bzero(cctx, sizeof(*cctx)); | |
2945 | cctx->host = NULL; | |
2946 | cctx->ai = cctx->aitop = NULL; | |
2947 | } | |
2948 | ||
2949 | /* Return CONNECTING channel to remote host, port */ | |
2950 | static Channel * | |
2951 | connect_to(const char *host, u_short port, char *ctype, char *rname) | |
2952 | { | |
2953 | struct addrinfo hints; | |
2954 | int gaierr; | |
2955 | int sock = -1; | |
2956 | char strport[NI_MAXSERV]; | |
2957 | struct channel_connect cctx; | |
2958 | Channel *c; | |
5260325f | 2959 | |
267d5589 | 2960 | memset(&cctx, 0, sizeof(cctx)); |
e07e21ad | 2961 | memset(&hints, 0, sizeof(hints)); |
2962 | hints.ai_family = IPv4or6; | |
2963 | hints.ai_socktype = SOCK_STREAM; | |
2964 | snprintf(strport, sizeof strport, "%d", port); | |
2965 | if ((gaierr = getaddrinfo(host, strport, &hints, &cctx.aitop)) != 0) { | |
2966 | error("connect_to %.100s: unknown host (%s)", host, | |
2967 | ssh_gai_strerror(gaierr)); | |
2968 | return NULL; | |
5260325f | 2969 | } |
e07e21ad | 2970 | |
2971 | cctx.host = xstrdup(host); | |
2972 | cctx.port = port; | |
2973 | cctx.ai = cctx.aitop; | |
2974 | ||
2975 | if ((sock = connect_next(&cctx)) == -1) { | |
2976 | error("connect to %.100s port %d failed: %s", | |
2977 | host, port, strerror(errno)); | |
2978 | channel_connect_ctx_free(&cctx); | |
2979 | return NULL; | |
8efc0c15 | 2980 | } |
e07e21ad | 2981 | c = channel_new(ctype, SSH_CHANNEL_CONNECTING, sock, sock, -1, |
2982 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, rname, 1); | |
2983 | c->connect_ctx = cctx; | |
2984 | return c; | |
7368a6c8 | 2985 | } |
01794848 | 2986 | |
e07e21ad | 2987 | Channel * |
2988 | channel_connect_by_listen_address(u_short listen_port, char *ctype, char *rname) | |
fa08c86b | 2989 | { |
2990 | int i; | |
01794848 | 2991 | |
e07e21ad | 2992 | for (i = 0; i < num_permitted_opens; i++) { |
d740ec16 | 2993 | if (permitted_opens[i].host_to_connect != NULL && |
e07e21ad | 2994 | permitted_opens[i].listen_port == listen_port) { |
01794848 | 2995 | return connect_to( |
fa08c86b | 2996 | permitted_opens[i].host_to_connect, |
e07e21ad | 2997 | permitted_opens[i].port_to_connect, ctype, rname); |
2998 | } | |
2999 | } | |
0b6fbf03 | 3000 | error("WARNING: Server requests forwarding for unknown listen_port %d", |
3001 | listen_port); | |
e07e21ad | 3002 | return NULL; |
fa08c86b | 3003 | } |
48e671d5 | 3004 | |
01794848 | 3005 | /* Check if connecting to that port is permitted and connect. */ |
e07e21ad | 3006 | Channel * |
3007 | channel_connect_to(const char *host, u_short port, char *ctype, char *rname) | |
01794848 | 3008 | { |
2fefbadf | 3009 | int i, permit, permit_adm = 1; |
01794848 | 3010 | |
3011 | permit = all_opens_permitted; | |
3012 | if (!permit) { | |
3013 | for (i = 0; i < num_permitted_opens; i++) | |
d740ec16 | 3014 | if (permitted_opens[i].host_to_connect != NULL && |
3015 | permitted_opens[i].port_to_connect == port && | |
01794848 | 3016 | strcmp(permitted_opens[i].host_to_connect, host) == 0) |
3017 | permit = 1; | |
2fefbadf | 3018 | } |
01794848 | 3019 | |
2fefbadf | 3020 | if (num_adm_permitted_opens > 0) { |
3021 | permit_adm = 0; | |
3022 | for (i = 0; i < num_adm_permitted_opens; i++) | |
3023 | if (permitted_adm_opens[i].host_to_connect != NULL && | |
3024 | permitted_adm_opens[i].port_to_connect == port && | |
3025 | strcmp(permitted_adm_opens[i].host_to_connect, host) | |
3026 | == 0) | |
3027 | permit_adm = 1; | |
01794848 | 3028 | } |
2fefbadf | 3029 | |
3030 | if (!permit || !permit_adm) { | |
bbe88b6d | 3031 | logit("Received request to connect to host %.100s port %d, " |
01794848 | 3032 | "but the request was denied.", host, port); |
e07e21ad | 3033 | return NULL; |
01794848 | 3034 | } |
e07e21ad | 3035 | return connect_to(host, port, ctype, rname); |
01794848 | 3036 | } |
3037 | ||
5e96b616 | 3038 | void |
3039 | channel_send_window_changes(void) | |
3040 | { | |
9a995072 | 3041 | u_int i; |
5e96b616 | 3042 | struct winsize ws; |
3043 | ||
3044 | for (i = 0; i < channels_alloc; i++) { | |
f8cc7664 | 3045 | if (channels[i] == NULL || !channels[i]->client_tty || |
5e96b616 | 3046 | channels[i]->type != SSH_CHANNEL_OPEN) |
3047 | continue; | |
3048 | if (ioctl(channels[i]->rfd, TIOCGWINSZ, &ws) < 0) | |
3049 | continue; | |
3050 | channel_request_start(i, "window-change", 0); | |
148de80c | 3051 | packet_put_int((u_int)ws.ws_col); |
3052 | packet_put_int((u_int)ws.ws_row); | |
3053 | packet_put_int((u_int)ws.ws_xpixel); | |
3054 | packet_put_int((u_int)ws.ws_ypixel); | |
5e96b616 | 3055 | packet_send(); |
3056 | } | |
3057 | } | |
3058 | ||
8e7895b8 | 3059 | /* -- X11 forwarding */ |
8efc0c15 | 3060 | |
aa3378df | 3061 | /* |
3062 | * Creates an internet domain socket for listening for X11 connections. | |
57f228e8 | 3063 | * Returns 0 and a suitable display number for the DISPLAY variable |
3064 | * stored in display_numberp , or -1 if an error occurs. | |
aa3378df | 3065 | */ |
c9d0ad9b | 3066 | int |
e6e573bd | 3067 | x11_create_display_inet(int x11_display_offset, int x11_use_localhost, |
d08341e6 | 3068 | int single_connection, u_int *display_numberp, int **chanids) |
8efc0c15 | 3069 | { |
ac151b18 | 3070 | Channel *nc = NULL; |
57112b5a | 3071 | int display_number, sock; |
3072 | u_short port; | |
48e671d5 | 3073 | struct addrinfo hints, *ai, *aitop; |
3074 | char strport[NI_MAXSERV]; | |
3075 | int gaierr, n, num_socks = 0, socks[NUM_SOCKS]; | |
5260325f | 3076 | |
59e5aff5 | 3077 | if (chanids == NULL) |
3078 | return -1; | |
3079 | ||
95f1eccc | 3080 | for (display_number = x11_display_offset; |
184eed6a | 3081 | display_number < MAX_DISPLAYS; |
3082 | display_number++) { | |
5260325f | 3083 | port = 6000 + display_number; |
48e671d5 | 3084 | memset(&hints, 0, sizeof(hints)); |
3085 | hints.ai_family = IPv4or6; | |
e6e573bd | 3086 | hints.ai_flags = x11_use_localhost ? 0: AI_PASSIVE; |
48e671d5 | 3087 | hints.ai_socktype = SOCK_STREAM; |
3088 | snprintf(strport, sizeof strport, "%d", port); | |
3089 | if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) { | |
bb4626fe | 3090 | error("getaddrinfo: %.100s", ssh_gai_strerror(gaierr)); |
c9d0ad9b | 3091 | return -1; |
5260325f | 3092 | } |
48e671d5 | 3093 | for (ai = aitop; ai; ai = ai->ai_next) { |
3094 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
3095 | continue; | |
3e131a6d | 3096 | sock = socket(ai->ai_family, ai->ai_socktype, |
3097 | ai->ai_protocol); | |
48e671d5 | 3098 | if (sock < 0) { |
4ee81249 | 3099 | if ((errno != EINVAL) && (errno != EAFNOSUPPORT)) { |
80a44451 | 3100 | error("socket: %.100s", strerror(errno)); |
0ea89f7e | 3101 | freeaddrinfo(aitop); |
c9d0ad9b | 3102 | return -1; |
80a44451 | 3103 | } else { |
22d89d24 | 3104 | debug("x11_create_display_inet: Socket family %d not supported", |
3105 | ai->ai_family); | |
80a44451 | 3106 | continue; |
3107 | } | |
48e671d5 | 3108 | } |
688aaeda | 3109 | #ifdef IPV6_V6ONLY |
3110 | if (ai->ai_family == AF_INET6) { | |
3111 | int on = 1; | |
3112 | if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) < 0) | |
3113 | error("setsockopt IPV6_V6ONLY: %.100s", strerror(errno)); | |
3114 | } | |
3115 | #endif | |
554ebbed | 3116 | if (x11_use_localhost) |
3117 | channel_set_reuseaddr(sock); | |
48e671d5 | 3118 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { |
d7ac5f18 | 3119 | debug2("bind port %d: %.100s", port, strerror(errno)); |
48e671d5 | 3120 | close(sock); |
16218745 | 3121 | |
48e671d5 | 3122 | for (n = 0; n < num_socks; n++) { |
48e671d5 | 3123 | close(socks[n]); |
3124 | } | |
3125 | num_socks = 0; | |
3126 | break; | |
3127 | } | |
3128 | socks[num_socks++] = sock; | |
3129 | if (num_socks == NUM_SOCKS) | |
3130 | break; | |
5260325f | 3131 | } |
4ccb01d6 | 3132 | freeaddrinfo(aitop); |
48e671d5 | 3133 | if (num_socks > 0) |
3134 | break; | |
5260325f | 3135 | } |
3136 | if (display_number >= MAX_DISPLAYS) { | |
3137 | error("Failed to allocate internet-domain X11 display socket."); | |
c9d0ad9b | 3138 | return -1; |
8efc0c15 | 3139 | } |
5260325f | 3140 | /* Start listening for connections on the socket. */ |
48e671d5 | 3141 | for (n = 0; n < num_socks; n++) { |
3142 | sock = socks[n]; | |
fce39749 | 3143 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { |
48e671d5 | 3144 | error("listen: %.100s", strerror(errno)); |
48e671d5 | 3145 | close(sock); |
c9d0ad9b | 3146 | return -1; |
a7effaac | 3147 | } |
a7effaac | 3148 | } |
5260325f | 3149 | |
48e671d5 | 3150 | /* Allocate a channel for each socket. */ |
52e3daed | 3151 | *chanids = xcalloc(num_socks + 1, sizeof(**chanids)); |
48e671d5 | 3152 | for (n = 0; n < num_socks; n++) { |
3153 | sock = socks[n]; | |
ac151b18 | 3154 | nc = channel_new("x11 listener", |
0b242b12 | 3155 | SSH_CHANNEL_X11_LISTENER, sock, sock, -1, |
3156 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, | |
0d942eff | 3157 | 0, "X11 inet listener", 1); |
3a0d3d54 | 3158 | nc->single_connection = single_connection; |
59e5aff5 | 3159 | (*chanids)[n] = nc->self; |
48e671d5 | 3160 | } |
59e5aff5 | 3161 | (*chanids)[n] = -1; |
5260325f | 3162 | |
c9d0ad9b | 3163 | /* Return the display number for the DISPLAY environment variable. */ |
57f228e8 | 3164 | *display_numberp = display_number; |
3165 | return (0); | |
8efc0c15 | 3166 | } |
3167 | ||
396c147e | 3168 | static int |
b5a1596f | 3169 | connect_local_xsocket_path(const char *pathname) |
8efc0c15 | 3170 | { |
5260325f | 3171 | int sock; |
3172 | struct sockaddr_un addr; | |
5260325f | 3173 | |
805e659f | 3174 | sock = socket(AF_UNIX, SOCK_STREAM, 0); |
3175 | if (sock < 0) | |
3176 | error("socket: %.100s", strerror(errno)); | |
3177 | memset(&addr, 0, sizeof(addr)); | |
3178 | addr.sun_family = AF_UNIX; | |
b5a1596f | 3179 | strlcpy(addr.sun_path, pathname, sizeof addr.sun_path); |
32596c7b | 3180 | if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) == 0) |
805e659f | 3181 | return sock; |
3182 | close(sock); | |
5260325f | 3183 | error("connect %.100s: %.100s", addr.sun_path, strerror(errno)); |
3184 | return -1; | |
8efc0c15 | 3185 | } |
3186 | ||
b5a1596f | 3187 | static int |
3188 | connect_local_xsocket(u_int dnr) | |
3189 | { | |
3190 | char buf[1024]; | |
3191 | snprintf(buf, sizeof buf, _PATH_UNIX_X, dnr); | |
3192 | return connect_local_xsocket_path(buf); | |
3193 | } | |
3194 | ||
0b242b12 | 3195 | int |
3196 | x11_connect_display(void) | |
8efc0c15 | 3197 | { |
4f16046f | 3198 | u_int display_number; |
5260325f | 3199 | const char *display; |
0b242b12 | 3200 | char buf[1024], *cp; |
48e671d5 | 3201 | struct addrinfo hints, *ai, *aitop; |
3202 | char strport[NI_MAXSERV]; | |
4f16046f | 3203 | int gaierr, sock = 0; |
5260325f | 3204 | |
5260325f | 3205 | /* Try to open a socket for the local X server. */ |
3206 | display = getenv("DISPLAY"); | |
3207 | if (!display) { | |
3208 | error("DISPLAY not set."); | |
0b242b12 | 3209 | return -1; |
5260325f | 3210 | } |
aa3378df | 3211 | /* |
3212 | * Now we decode the value of the DISPLAY variable and make a | |
3213 | * connection to the real X server. | |
3214 | */ | |
3215 | ||
b5a1596f | 3216 | /* Check if the display is from launchd. */ |
3217 | #ifdef __APPLE__ | |
3218 | if (strncmp(display, "/tmp/launch", 11) == 0) { | |
3219 | sock = connect_local_xsocket_path(display); | |
3220 | if (sock < 0) | |
3221 | return -1; | |
3222 | ||
3223 | /* OK, we now have a connection to the display. */ | |
3224 | return sock; | |
3225 | } | |
3226 | #endif | |
aa3378df | 3227 | /* |
3228 | * Check if it is a unix domain socket. Unix domain displays are in | |
3229 | * one of the following formats: unix:d[.s], :d[.s], ::d[.s] | |
3230 | */ | |
5260325f | 3231 | if (strncmp(display, "unix:", 5) == 0 || |
3232 | display[0] == ':') { | |
3233 | /* Connect to the unix domain socket. */ | |
4f16046f | 3234 | if (sscanf(strrchr(display, ':') + 1, "%u", &display_number) != 1) { |
5260325f | 3235 | error("Could not parse display number from DISPLAY: %.100s", |
184eed6a | 3236 | display); |
0b242b12 | 3237 | return -1; |
5260325f | 3238 | } |
3239 | /* Create a socket. */ | |
3240 | sock = connect_local_xsocket(display_number); | |
3241 | if (sock < 0) | |
0b242b12 | 3242 | return -1; |
5260325f | 3243 | |
3244 | /* OK, we now have a connection to the display. */ | |
0b242b12 | 3245 | return sock; |
5260325f | 3246 | } |
aa3378df | 3247 | /* |
3248 | * Connect to an inet socket. The DISPLAY value is supposedly | |
3249 | * hostname:d[.s], where hostname may also be numeric IP address. | |
3250 | */ | |
74860245 | 3251 | strlcpy(buf, display, sizeof(buf)); |
5260325f | 3252 | cp = strchr(buf, ':'); |
3253 | if (!cp) { | |
3254 | error("Could not find ':' in DISPLAY: %.100s", display); | |
0b242b12 | 3255 | return -1; |
5260325f | 3256 | } |
3257 | *cp = 0; | |
aa3378df | 3258 | /* buf now contains the host name. But first we parse the display number. */ |
4f16046f | 3259 | if (sscanf(cp + 1, "%u", &display_number) != 1) { |
5260325f | 3260 | error("Could not parse display number from DISPLAY: %.100s", |
184eed6a | 3261 | display); |
0b242b12 | 3262 | return -1; |
5260325f | 3263 | } |
5260325f | 3264 | |
48e671d5 | 3265 | /* Look up the host address */ |
3266 | memset(&hints, 0, sizeof(hints)); | |
3267 | hints.ai_family = IPv4or6; | |
3268 | hints.ai_socktype = SOCK_STREAM; | |
4f16046f | 3269 | snprintf(strport, sizeof strport, "%u", 6000 + display_number); |
48e671d5 | 3270 | if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) { |
bb4626fe | 3271 | error("%.100s: unknown host. (%s)", buf, |
3272 | ssh_gai_strerror(gaierr)); | |
0b242b12 | 3273 | return -1; |
8efc0c15 | 3274 | } |
48e671d5 | 3275 | for (ai = aitop; ai; ai = ai->ai_next) { |
3276 | /* Create a socket. */ | |
3e131a6d | 3277 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
48e671d5 | 3278 | if (sock < 0) { |
d7ac5f18 | 3279 | debug2("socket: %.100s", strerror(errno)); |
7368a6c8 | 3280 | continue; |
3281 | } | |
3282 | /* Connect it to the display. */ | |
3283 | if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) { | |
4f16046f | 3284 | debug2("connect %.100s port %u: %.100s", buf, |
7368a6c8 | 3285 | 6000 + display_number, strerror(errno)); |
3286 | close(sock); | |
3287 | continue; | |
3288 | } | |
3289 | /* Success */ | |
3290 | break; | |
48e671d5 | 3291 | } |
48e671d5 | 3292 | freeaddrinfo(aitop); |
3293 | if (!ai) { | |
4f16046f | 3294 | error("connect %.100s port %u: %.100s", buf, 6000 + display_number, |
48e671d5 | 3295 | strerror(errno)); |
0b242b12 | 3296 | return -1; |
8efc0c15 | 3297 | } |
bcc0381e | 3298 | set_nodelay(sock); |
0b242b12 | 3299 | return sock; |
3300 | } | |
5260325f | 3301 | |
0b242b12 | 3302 | /* |
3303 | * This is called when SSH_SMSG_X11_OPEN is received. The packet contains | |
3304 | * the remote channel number. We should do whatever we want, and respond | |
3305 | * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE. | |
3306 | */ | |
5260325f | 3307 | |
ebb90778 | 3308 | /* ARGSUSED */ |
0b242b12 | 3309 | void |
7819b5c3 | 3310 | x11_input_open(int type, u_int32_t seq, void *ctxt) |
0b242b12 | 3311 | { |
719fc62f | 3312 | Channel *c = NULL; |
3313 | int remote_id, sock = 0; | |
0b242b12 | 3314 | char *remote_host; |
5260325f | 3315 | |
719fc62f | 3316 | debug("Received X11 open request."); |
5260325f | 3317 | |
719fc62f | 3318 | remote_id = packet_get_int(); |
8e7895b8 | 3319 | |
3320 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) { | |
719fc62f | 3321 | remote_host = packet_get_string(NULL); |
0b242b12 | 3322 | } else { |
3323 | remote_host = xstrdup("unknown (remote did not supply name)"); | |
0b242b12 | 3324 | } |
95500969 | 3325 | packet_check_eom(); |
0b242b12 | 3326 | |
3327 | /* Obtain a connection to the real X display. */ | |
3328 | sock = x11_connect_display(); | |
719fc62f | 3329 | if (sock != -1) { |
3330 | /* Allocate a channel for this connection. */ | |
3331 | c = channel_new("connected x11 socket", | |
3332 | SSH_CHANNEL_X11_OPEN, sock, sock, -1, 0, 0, 0, | |
3333 | remote_host, 1); | |
3a0d3d54 | 3334 | c->remote_id = remote_id; |
3335 | c->force_drain = 1; | |
719fc62f | 3336 | } |
0d942eff | 3337 | xfree(remote_host); |
719fc62f | 3338 | if (c == NULL) { |
0b242b12 | 3339 | /* Send refusal to the remote host. */ |
3340 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
719fc62f | 3341 | packet_put_int(remote_id); |
0b242b12 | 3342 | } else { |
0b242b12 | 3343 | /* Send a confirmation to the remote host. */ |
3344 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
719fc62f | 3345 | packet_put_int(remote_id); |
3346 | packet_put_int(c->self); | |
0b242b12 | 3347 | } |
719fc62f | 3348 | packet_send(); |
8efc0c15 | 3349 | } |
3350 | ||
a22aff1f | 3351 | /* dummy protocol handler that denies SSH-1 requests (agent/x11) */ |
ebb90778 | 3352 | /* ARGSUSED */ |
a22aff1f | 3353 | void |
7819b5c3 | 3354 | deny_input_open(int type, u_int32_t seq, void *ctxt) |
a22aff1f | 3355 | { |
3356 | int rchan = packet_get_int(); | |
e1feb9bf | 3357 | |
6aacefa7 | 3358 | switch (type) { |
a22aff1f | 3359 | case SSH_SMSG_AGENT_OPEN: |
3360 | error("Warning: ssh server tried agent forwarding."); | |
3361 | break; | |
3362 | case SSH_SMSG_X11_OPEN: | |
3363 | error("Warning: ssh server tried X11 forwarding."); | |
3364 | break; | |
3365 | default: | |
7819b5c3 | 3366 | error("deny_input_open: type %d", type); |
a22aff1f | 3367 | break; |
3368 | } | |
1908529f | 3369 | error("Warning: this is probably a break-in attempt by a malicious server."); |
a22aff1f | 3370 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
3371 | packet_put_int(rchan); | |
3372 | packet_send(); | |
3373 | } | |
3374 | ||
aa3378df | 3375 | /* |
3376 | * Requests forwarding of X11 connections, generates fake authentication | |
3377 | * data, and enables authentication spoofing. | |
8e7895b8 | 3378 | * This should be called in the client only. |
aa3378df | 3379 | */ |
6ae2364d | 3380 | void |
9bf083eb | 3381 | x11_request_forwarding_with_spoofing(int client_session_id, const char *disp, |
0b242b12 | 3382 | const char *proto, const char *data) |
8efc0c15 | 3383 | { |
1e3b8b07 | 3384 | u_int data_len = (u_int) strlen(data) / 2; |
ef07103c | 3385 | u_int i, value; |
5260325f | 3386 | char *new_data; |
3387 | int screen_number; | |
3388 | const char *cp; | |
ca75d7de | 3389 | u_int32_t rnd = 0; |
5260325f | 3390 | |
4297b666 | 3391 | if (x11_saved_display == NULL) |
3392 | x11_saved_display = xstrdup(disp); | |
3393 | else if (strcmp(disp, x11_saved_display) != 0) { | |
ef07103c | 3394 | error("x11_request_forwarding_with_spoofing: different " |
3395 | "$DISPLAY already forwarded"); | |
3396 | return; | |
3397 | } | |
3398 | ||
0875ae22 | 3399 | cp = strchr(disp, ':'); |
5260325f | 3400 | if (cp) |
3401 | cp = strchr(cp, '.'); | |
3402 | if (cp) | |
d6d4897e | 3403 | screen_number = (u_int)strtonum(cp + 1, 0, 400, NULL); |
5260325f | 3404 | else |
3405 | screen_number = 0; | |
3406 | ||
ef07103c | 3407 | if (x11_saved_proto == NULL) { |
3408 | /* Save protocol name. */ | |
3409 | x11_saved_proto = xstrdup(proto); | |
3410 | /* | |
56964485 | 3411 | * Extract real authentication data and generate fake data |
ef07103c | 3412 | * of the same length. |
3413 | */ | |
3414 | x11_saved_data = xmalloc(data_len); | |
3415 | x11_fake_data = xmalloc(data_len); | |
3416 | for (i = 0; i < data_len; i++) { | |
3417 | if (sscanf(data + 2 * i, "%2x", &value) != 1) | |
3418 | fatal("x11_request_forwarding: bad " | |
3419 | "authentication data: %.100s", data); | |
3420 | if (i % 4 == 0) | |
3421 | rnd = arc4random(); | |
3422 | x11_saved_data[i] = value; | |
3423 | x11_fake_data[i] = rnd & 0xff; | |
3424 | rnd >>= 8; | |
3425 | } | |
3426 | x11_saved_data_len = data_len; | |
3427 | x11_fake_data_len = data_len; | |
3428 | } | |
5260325f | 3429 | |
3430 | /* Convert the fake data into hex. */ | |
ef07103c | 3431 | new_data = tohex(x11_fake_data, data_len); |
5260325f | 3432 | |
3433 | /* Send the request packet. */ | |
0b242b12 | 3434 | if (compat20) { |
3435 | channel_request_start(client_session_id, "x11-req", 0); | |
3436 | packet_put_char(0); /* XXX bool single connection */ | |
3437 | } else { | |
3438 | packet_start(SSH_CMSG_X11_REQUEST_FORWARDING); | |
3439 | } | |
3440 | packet_put_cstring(proto); | |
3441 | packet_put_cstring(new_data); | |
5260325f | 3442 | packet_put_int(screen_number); |
3443 | packet_send(); | |
3444 | packet_write_wait(); | |
3445 | xfree(new_data); | |
8efc0c15 | 3446 | } |
3447 | ||
8e7895b8 | 3448 | |
3449 | /* -- agent forwarding */ | |
3450 | ||
8efc0c15 | 3451 | /* Sends a message to the server to request authentication fd forwarding. */ |
3452 | ||
6ae2364d | 3453 | void |
d5bb9418 | 3454 | auth_request_forwarding(void) |
8efc0c15 | 3455 | { |
5260325f | 3456 | packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING); |
3457 | packet_send(); | |
3458 | packet_write_wait(); | |
8efc0c15 | 3459 | } |