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028094f4 | 1 | /* $OpenBSD: channels.c,v 1.254 2006/07/11 20:07:25 stevesk Exp $ */ |
8efc0c15 | 2 | /* |
5260325f | 3 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
5260325f | 4 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
5 | * All rights reserved | |
5260325f | 6 | * This file contains functions for generic socket connection forwarding. |
7 | * There is also code for initiating connection forwarding for X11 connections, | |
8 | * arbitrary tcp/ip connections, and the authentication agent connection. | |
6ae2364d | 9 | * |
bcbf86ec | 10 | * As far as I am concerned, the code I have written for this software |
11 | * can be used freely for any purpose. Any derived versions of this | |
12 | * software must be clearly marked as such, and if the derived work is | |
13 | * incompatible with the protocol description in the RFC file, it must be | |
14 | * called by a name other than "ssh" or "Secure Shell". | |
15 | * | |
7e7327a1 | 16 | * SSH2 support added by Markus Friedl. |
8341f420 | 17 | * Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved. |
bcbf86ec | 18 | * Copyright (c) 1999 Dug Song. All rights reserved. |
19 | * Copyright (c) 1999 Theo de Raadt. All rights reserved. | |
20 | * | |
21 | * Redistribution and use in source and binary forms, with or without | |
22 | * modification, are permitted provided that the following conditions | |
23 | * are met: | |
24 | * 1. Redistributions of source code must retain the above copyright | |
25 | * notice, this list of conditions and the following disclaimer. | |
26 | * 2. Redistributions in binary form must reproduce the above copyright | |
27 | * notice, this list of conditions and the following disclaimer in the | |
28 | * documentation and/or other materials provided with the distribution. | |
29 | * | |
30 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
31 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
32 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
33 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
34 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
35 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
36 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
37 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
38 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
39 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
5260325f | 40 | */ |
8efc0c15 | 41 | |
42 | #include "includes.h" | |
bd7c69ea | 43 | |
44 | #include <sys/ioctl.h> | |
cebb4c24 | 45 | #include <sys/types.h> |
46 | #include <sys/un.h> | |
319d6b41 | 47 | #include <sys/socket.h> |
48 | ||
49 | #include <netinet/in.h> | |
50 | #include <arpa/inet.h> | |
1d3e026f | 51 | |
028094f4 | 52 | #include <errno.h> |
1d3e026f | 53 | #include <termios.h> |
8efc0c15 | 54 | |
55 | #include "ssh.h" | |
42f11eb2 | 56 | #include "ssh1.h" |
57 | #include "ssh2.h" | |
8efc0c15 | 58 | #include "packet.h" |
59 | #include "xmalloc.h" | |
42f11eb2 | 60 | #include "log.h" |
61 | #include "misc.h" | |
8efc0c15 | 62 | #include "channels.h" |
8efc0c15 | 63 | #include "compat.h" |
42f11eb2 | 64 | #include "canohost.h" |
4c8722d9 | 65 | #include "key.h" |
66 | #include "authfd.h" | |
805e659f | 67 | #include "pathnames.h" |
f49658f5 | 68 | #include "bufaux.h" |
8efc0c15 | 69 | |
8e7895b8 | 70 | /* -- channel core */ |
8efc0c15 | 71 | |
aa3378df | 72 | /* |
73 | * Pointer to an array containing all allocated channels. The array is | |
74 | * dynamically extended as needed. | |
75 | */ | |
719fc62f | 76 | static Channel **channels = NULL; |
8efc0c15 | 77 | |
aa3378df | 78 | /* |
79 | * Size of the channel array. All slots of the array must always be | |
719fc62f | 80 | * initialized (at least the type field); unused slots set to NULL |
aa3378df | 81 | */ |
9a995072 | 82 | static u_int channels_alloc = 0; |
8efc0c15 | 83 | |
aa3378df | 84 | /* |
85 | * Maximum file descriptor value used in any of the channels. This is | |
719fc62f | 86 | * updated in channel_new. |
aa3378df | 87 | */ |
39929cdb | 88 | static int channel_max_fd = 0; |
8efc0c15 | 89 | |
8efc0c15 | 90 | |
8e7895b8 | 91 | /* -- tcp forwarding */ |
8efc0c15 | 92 | |
aa3378df | 93 | /* |
94 | * Data structure for storing which hosts are permitted for forward requests. | |
95 | * The local sides of any remote forwards are stored in this array to prevent | |
96 | * a corrupt remote server from accessing arbitrary TCP/IP ports on our local | |
97 | * network (which might be behind a firewall). | |
98 | */ | |
5260325f | 99 | typedef struct { |
7368a6c8 | 100 | char *host_to_connect; /* Connect to 'host'. */ |
101 | u_short port_to_connect; /* Connect to 'port'. */ | |
102 | u_short listen_port; /* Remote side should listen port number. */ | |
8efc0c15 | 103 | } ForwardPermission; |
104 | ||
105 | /* List of all permitted host/port pairs to connect. */ | |
106 | static ForwardPermission permitted_opens[SSH_MAX_FORWARDS_PER_DIRECTION]; | |
8e7895b8 | 107 | |
8efc0c15 | 108 | /* Number of permitted host/port pairs in the array. */ |
109 | static int num_permitted_opens = 0; | |
aa3378df | 110 | /* |
111 | * If this is true, all opens are permitted. This is the case on the server | |
112 | * on which we have to trust the client anyway, and the user could do | |
113 | * anything after logging in anyway. | |
114 | */ | |
8efc0c15 | 115 | static int all_opens_permitted = 0; |
116 | ||
8efc0c15 | 117 | |
8e7895b8 | 118 | /* -- X11 forwarding */ |
42f11eb2 | 119 | |
8e7895b8 | 120 | /* Maximum number of fake X11 displays to try. */ |
121 | #define MAX_DISPLAYS 1000 | |
0490e609 | 122 | |
ef07103c | 123 | /* Saved X11 local (client) display. */ |
124 | static char *x11_saved_display = NULL; | |
125 | ||
8e7895b8 | 126 | /* Saved X11 authentication protocol name. */ |
127 | static char *x11_saved_proto = NULL; | |
8efc0c15 | 128 | |
8e7895b8 | 129 | /* Saved X11 authentication data. This is the real data. */ |
130 | static char *x11_saved_data = NULL; | |
131 | static u_int x11_saved_data_len = 0; | |
132 | ||
133 | /* | |
134 | * Fake X11 authentication data. This is what the server will be sending us; | |
135 | * we should replace any occurrences of this by the real data. | |
136 | */ | |
338eb2ab | 137 | static u_char *x11_fake_data = NULL; |
8e7895b8 | 138 | static u_int x11_fake_data_len; |
139 | ||
140 | ||
141 | /* -- agent forwarding */ | |
8efc0c15 | 142 | |
8e7895b8 | 143 | #define NUM_SOCKS 10 |
144 | ||
8e7895b8 | 145 | /* AF_UNSPEC or AF_INET or AF_INET6 */ |
5e4a7219 | 146 | static int IPv4or6 = AF_UNSPEC; |
8e7895b8 | 147 | |
148 | /* helper */ | |
396c147e | 149 | static void port_open_helper(Channel *c, char *rtype); |
8e7895b8 | 150 | |
151 | /* -- channel core */ | |
7368a6c8 | 152 | |
153 | Channel * | |
b872f7f0 | 154 | channel_by_id(int id) |
7368a6c8 | 155 | { |
156 | Channel *c; | |
719fc62f | 157 | |
9a995072 | 158 | if (id < 0 || (u_int)id >= channels_alloc) { |
b872f7f0 | 159 | logit("channel_by_id: %d: bad id", id); |
7368a6c8 | 160 | return NULL; |
161 | } | |
719fc62f | 162 | c = channels[id]; |
163 | if (c == NULL) { | |
b872f7f0 | 164 | logit("channel_by_id: %d: bad id: channel free", id); |
7368a6c8 | 165 | return NULL; |
166 | } | |
167 | return c; | |
168 | } | |
169 | ||
b872f7f0 | 170 | /* |
171 | * Returns the channel if it is allowed to receive protocol messages. | |
172 | * Private channels, like listening sockets, may not receive messages. | |
173 | */ | |
174 | Channel * | |
175 | channel_lookup(int id) | |
176 | { | |
177 | Channel *c; | |
178 | ||
179 | if ((c = channel_by_id(id)) == NULL) | |
180 | return (NULL); | |
181 | ||
c8e9c167 | 182 | switch (c->type) { |
b872f7f0 | 183 | case SSH_CHANNEL_X11_OPEN: |
184 | case SSH_CHANNEL_LARVAL: | |
185 | case SSH_CHANNEL_CONNECTING: | |
186 | case SSH_CHANNEL_DYNAMIC: | |
187 | case SSH_CHANNEL_OPENING: | |
188 | case SSH_CHANNEL_OPEN: | |
189 | case SSH_CHANNEL_INPUT_DRAINING: | |
190 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
191 | return (c); | |
b872f7f0 | 192 | } |
193 | logit("Non-public channel %d, type %d.", id, c->type); | |
194 | return (NULL); | |
195 | } | |
196 | ||
aa3378df | 197 | /* |
1d1ffb87 | 198 | * Register filedescriptors for a channel, used when allocating a channel or |
0fbe8c74 | 199 | * when the channel consumer/producer is ready, e.g. shell exec'd |
aa3378df | 200 | */ |
396c147e | 201 | static void |
a22aff1f | 202 | channel_register_fds(Channel *c, int rfd, int wfd, int efd, |
203 | int extusage, int nonblock) | |
8efc0c15 | 204 | { |
5260325f | 205 | /* Update the maximum file descriptor value. */ |
39929cdb | 206 | channel_max_fd = MAX(channel_max_fd, rfd); |
207 | channel_max_fd = MAX(channel_max_fd, wfd); | |
208 | channel_max_fd = MAX(channel_max_fd, efd); | |
209 | ||
aa3378df | 210 | /* XXX set close-on-exec -markus */ |
1d1ffb87 | 211 | |
0fbe8c74 | 212 | c->rfd = rfd; |
213 | c->wfd = wfd; | |
214 | c->sock = (rfd == wfd) ? rfd : -1; | |
5e96b616 | 215 | c->ctl_fd = -1; /* XXX: set elsewhere */ |
0fbe8c74 | 216 | c->efd = efd; |
217 | c->extended_usage = extusage; | |
a22aff1f | 218 | |
0ae4fe1d | 219 | /* XXX ugly hack: nonblock is only set by the server */ |
220 | if (nonblock && isatty(c->rfd)) { | |
d7ac5f18 | 221 | debug2("channel %d: rfd %d isatty", c->self, c->rfd); |
0ae4fe1d | 222 | c->isatty = 1; |
223 | if (!isatty(c->wfd)) { | |
94dfb550 | 224 | error("channel %d: wfd %d is not a tty?", |
0ae4fe1d | 225 | c->self, c->wfd); |
226 | } | |
227 | } else { | |
228 | c->isatty = 0; | |
229 | } | |
21c2c5cd | 230 | c->wfd_isatty = isatty(c->wfd); |
0ae4fe1d | 231 | |
a22aff1f | 232 | /* enable nonblocking mode */ |
233 | if (nonblock) { | |
234 | if (rfd != -1) | |
235 | set_nonblock(rfd); | |
236 | if (wfd != -1) | |
237 | set_nonblock(wfd); | |
238 | if (efd != -1) | |
239 | set_nonblock(efd); | |
240 | } | |
0fbe8c74 | 241 | } |
242 | ||
243 | /* | |
244 | * Allocate a new channel object and set its type and socket. This will cause | |
245 | * remote_name to be freed. | |
246 | */ | |
719fc62f | 247 | Channel * |
0fbe8c74 | 248 | channel_new(char *ctype, int type, int rfd, int wfd, int efd, |
f91d9a89 | 249 | u_int window, u_int maxpack, int extusage, char *remote_name, int nonblock) |
0fbe8c74 | 250 | { |
9a995072 | 251 | int found; |
252 | u_int i; | |
0fbe8c74 | 253 | Channel *c; |
5260325f | 254 | |
255 | /* Do initial allocation if this is the first call. */ | |
256 | if (channels_alloc == 0) { | |
257 | channels_alloc = 10; | |
52e3daed | 258 | channels = xcalloc(channels_alloc, sizeof(Channel *)); |
5260325f | 259 | for (i = 0; i < channels_alloc; i++) |
719fc62f | 260 | channels[i] = NULL; |
5260325f | 261 | } |
262 | /* Try to find a free slot where to put the new channel. */ | |
263 | for (found = -1, i = 0; i < channels_alloc; i++) | |
719fc62f | 264 | if (channels[i] == NULL) { |
5260325f | 265 | /* Found a free slot. */ |
9a995072 | 266 | found = (int)i; |
5260325f | 267 | break; |
268 | } | |
9a995072 | 269 | if (found < 0) { |
aa3378df | 270 | /* There are no free slots. Take last+1 slot and expand the array. */ |
5260325f | 271 | found = channels_alloc; |
5df8c731 | 272 | if (channels_alloc > 10000) |
273 | fatal("channel_new: internal error: channels_alloc %d " | |
274 | "too big.", channels_alloc); | |
c5d10563 | 275 | channels = xrealloc(channels, channels_alloc + 10, |
276 | sizeof(Channel *)); | |
20419cc1 | 277 | channels_alloc += 10; |
de273eef | 278 | debug2("channel: expanding %d", channels_alloc); |
5260325f | 279 | for (i = found; i < channels_alloc; i++) |
719fc62f | 280 | channels[i] = NULL; |
5260325f | 281 | } |
719fc62f | 282 | /* Initialize and return new channel. */ |
52e3daed | 283 | c = channels[found] = xcalloc(1, sizeof(Channel)); |
5260325f | 284 | buffer_init(&c->input); |
285 | buffer_init(&c->output); | |
7368a6c8 | 286 | buffer_init(&c->extended); |
70bef40e | 287 | c->ostate = CHAN_OUTPUT_OPEN; |
288 | c->istate = CHAN_INPUT_OPEN; | |
289 | c->flags = 0; | |
a22aff1f | 290 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock); |
5260325f | 291 | c->self = found; |
292 | c->type = type; | |
7368a6c8 | 293 | c->ctype = ctype; |
0b242b12 | 294 | c->local_window = window; |
295 | c->local_window_max = window; | |
296 | c->local_consumed = 0; | |
297 | c->local_maxpacket = maxpack; | |
5260325f | 298 | c->remote_id = -1; |
0d942eff | 299 | c->remote_name = xstrdup(remote_name); |
7368a6c8 | 300 | c->remote_window = 0; |
301 | c->remote_maxpacket = 0; | |
a5f82435 | 302 | c->force_drain = 0; |
ac151b18 | 303 | c->single_connection = 0; |
3cf2be58 | 304 | c->detach_user = NULL; |
8cd0437d | 305 | c->detach_close = 0; |
05ca0898 | 306 | c->confirm = NULL; |
5e96b616 | 307 | c->confirm_ctx = NULL; |
2e73a022 | 308 | c->input_filter = NULL; |
c1c6a032 | 309 | c->output_filter = NULL; |
5260325f | 310 | debug("channel %d: new [%s]", found, remote_name); |
719fc62f | 311 | return c; |
7368a6c8 | 312 | } |
8efc0c15 | 313 | |
489aa2e9 | 314 | static int |
315 | channel_find_maxfd(void) | |
316 | { | |
9a995072 | 317 | u_int i; |
318 | int max = 0; | |
489aa2e9 | 319 | Channel *c; |
320 | ||
321 | for (i = 0; i < channels_alloc; i++) { | |
322 | c = channels[i]; | |
323 | if (c != NULL) { | |
324 | max = MAX(max, c->rfd); | |
325 | max = MAX(max, c->wfd); | |
326 | max = MAX(max, c->efd); | |
327 | } | |
328 | } | |
329 | return max; | |
330 | } | |
331 | ||
332 | int | |
333 | channel_close_fd(int *fdp) | |
334 | { | |
335 | int ret = 0, fd = *fdp; | |
336 | ||
337 | if (fd != -1) { | |
338 | ret = close(fd); | |
339 | *fdp = -1; | |
340 | if (fd == channel_max_fd) | |
341 | channel_max_fd = channel_find_maxfd(); | |
342 | } | |
343 | return ret; | |
344 | } | |
345 | ||
0fbe8c74 | 346 | /* Close all channel fd/socket. */ |
396c147e | 347 | static void |
0fbe8c74 | 348 | channel_close_fds(Channel *c) |
349 | { | |
5e96b616 | 350 | debug3("channel %d: close_fds r %d w %d e %d c %d", |
351 | c->self, c->rfd, c->wfd, c->efd, c->ctl_fd); | |
6fd8622b | 352 | |
489aa2e9 | 353 | channel_close_fd(&c->sock); |
5e96b616 | 354 | channel_close_fd(&c->ctl_fd); |
489aa2e9 | 355 | channel_close_fd(&c->rfd); |
356 | channel_close_fd(&c->wfd); | |
357 | channel_close_fd(&c->efd); | |
0fbe8c74 | 358 | } |
359 | ||
8e7895b8 | 360 | /* Free the channel and close its fd/socket. */ |
8e7895b8 | 361 | void |
362 | channel_free(Channel *c) | |
363 | { | |
364 | char *s; | |
9a995072 | 365 | u_int i, n; |
8e7895b8 | 366 | |
367 | for (n = 0, i = 0; i < channels_alloc; i++) | |
368 | if (channels[i]) | |
369 | n++; | |
9a995072 | 370 | debug("channel %d: free: %s, nchannels %u", c->self, |
8e7895b8 | 371 | c->remote_name ? c->remote_name : "???", n); |
372 | ||
373 | s = channel_open_message(); | |
d7ac5f18 | 374 | debug3("channel %d: status: %s", c->self, s); |
8e7895b8 | 375 | xfree(s); |
376 | ||
8e7895b8 | 377 | if (c->sock != -1) |
378 | shutdown(c->sock, SHUT_RDWR); | |
5e96b616 | 379 | if (c->ctl_fd != -1) |
380 | shutdown(c->ctl_fd, SHUT_RDWR); | |
8e7895b8 | 381 | channel_close_fds(c); |
382 | buffer_free(&c->input); | |
383 | buffer_free(&c->output); | |
384 | buffer_free(&c->extended); | |
385 | if (c->remote_name) { | |
386 | xfree(c->remote_name); | |
387 | c->remote_name = NULL; | |
388 | } | |
389 | channels[c->self] = NULL; | |
390 | xfree(c); | |
391 | } | |
392 | ||
8e7895b8 | 393 | void |
d6746a0b | 394 | channel_free_all(void) |
8e7895b8 | 395 | { |
9a995072 | 396 | u_int i; |
8e7895b8 | 397 | |
d6746a0b | 398 | for (i = 0; i < channels_alloc; i++) |
399 | if (channels[i] != NULL) | |
400 | channel_free(channels[i]); | |
8e7895b8 | 401 | } |
402 | ||
403 | /* | |
404 | * Closes the sockets/fds of all channels. This is used to close extra file | |
405 | * descriptors after a fork. | |
406 | */ | |
8e7895b8 | 407 | void |
d5bb9418 | 408 | channel_close_all(void) |
8e7895b8 | 409 | { |
9a995072 | 410 | u_int i; |
8e7895b8 | 411 | |
412 | for (i = 0; i < channels_alloc; i++) | |
413 | if (channels[i] != NULL) | |
414 | channel_close_fds(channels[i]); | |
415 | } | |
416 | ||
3cf2be58 | 417 | /* |
418 | * Stop listening to channels. | |
419 | */ | |
3cf2be58 | 420 | void |
421 | channel_stop_listening(void) | |
422 | { | |
9a995072 | 423 | u_int i; |
3cf2be58 | 424 | Channel *c; |
425 | ||
426 | for (i = 0; i < channels_alloc; i++) { | |
427 | c = channels[i]; | |
428 | if (c != NULL) { | |
429 | switch (c->type) { | |
430 | case SSH_CHANNEL_AUTH_SOCKET: | |
431 | case SSH_CHANNEL_PORT_LISTENER: | |
432 | case SSH_CHANNEL_RPORT_LISTENER: | |
433 | case SSH_CHANNEL_X11_LISTENER: | |
489aa2e9 | 434 | channel_close_fd(&c->sock); |
3cf2be58 | 435 | channel_free(c); |
436 | break; | |
437 | } | |
438 | } | |
439 | } | |
440 | } | |
441 | ||
8e7895b8 | 442 | /* |
443 | * Returns true if no channel has too much buffered data, and false if one or | |
444 | * more channel is overfull. | |
445 | */ | |
8e7895b8 | 446 | int |
d5bb9418 | 447 | channel_not_very_much_buffered_data(void) |
8e7895b8 | 448 | { |
449 | u_int i; | |
450 | Channel *c; | |
451 | ||
452 | for (i = 0; i < channels_alloc; i++) { | |
453 | c = channels[i]; | |
454 | if (c != NULL && c->type == SSH_CHANNEL_OPEN) { | |
0c139bd1 | 455 | #if 0 |
456 | if (!compat20 && | |
457 | buffer_len(&c->input) > packet_get_maxsize()) { | |
faa483fa | 458 | debug2("channel %d: big input buffer %d", |
8e7895b8 | 459 | c->self, buffer_len(&c->input)); |
460 | return 0; | |
461 | } | |
0c139bd1 | 462 | #endif |
8e7895b8 | 463 | if (buffer_len(&c->output) > packet_get_maxsize()) { |
a27002e5 | 464 | debug2("channel %d: big output buffer %u > %u", |
0c139bd1 | 465 | c->self, buffer_len(&c->output), |
466 | packet_get_maxsize()); | |
8e7895b8 | 467 | return 0; |
468 | } | |
469 | } | |
470 | } | |
471 | return 1; | |
472 | } | |
473 | ||
474 | /* Returns true if any channel is still open. */ | |
8e7895b8 | 475 | int |
d5bb9418 | 476 | channel_still_open(void) |
8e7895b8 | 477 | { |
9a995072 | 478 | u_int i; |
8e7895b8 | 479 | Channel *c; |
480 | ||
481 | for (i = 0; i < channels_alloc; i++) { | |
482 | c = channels[i]; | |
483 | if (c == NULL) | |
484 | continue; | |
485 | switch (c->type) { | |
486 | case SSH_CHANNEL_X11_LISTENER: | |
487 | case SSH_CHANNEL_PORT_LISTENER: | |
488 | case SSH_CHANNEL_RPORT_LISTENER: | |
489 | case SSH_CHANNEL_CLOSED: | |
490 | case SSH_CHANNEL_AUTH_SOCKET: | |
491 | case SSH_CHANNEL_DYNAMIC: | |
492 | case SSH_CHANNEL_CONNECTING: | |
493 | case SSH_CHANNEL_ZOMBIE: | |
494 | continue; | |
495 | case SSH_CHANNEL_LARVAL: | |
496 | if (!compat20) | |
497 | fatal("cannot happen: SSH_CHANNEL_LARVAL"); | |
498 | continue; | |
499 | case SSH_CHANNEL_OPENING: | |
500 | case SSH_CHANNEL_OPEN: | |
501 | case SSH_CHANNEL_X11_OPEN: | |
502 | return 1; | |
503 | case SSH_CHANNEL_INPUT_DRAINING: | |
504 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
505 | if (!compat13) | |
506 | fatal("cannot happen: OUT_DRAIN"); | |
507 | return 1; | |
508 | default: | |
509 | fatal("channel_still_open: bad channel type %d", c->type); | |
510 | /* NOTREACHED */ | |
511 | } | |
512 | } | |
513 | return 0; | |
514 | } | |
515 | ||
516 | /* Returns the id of an open channel suitable for keepaliving */ | |
8e7895b8 | 517 | int |
d5bb9418 | 518 | channel_find_open(void) |
8e7895b8 | 519 | { |
9a995072 | 520 | u_int i; |
8e7895b8 | 521 | Channel *c; |
522 | ||
523 | for (i = 0; i < channels_alloc; i++) { | |
524 | c = channels[i]; | |
13de3560 | 525 | if (c == NULL || c->remote_id < 0) |
8e7895b8 | 526 | continue; |
527 | switch (c->type) { | |
528 | case SSH_CHANNEL_CLOSED: | |
529 | case SSH_CHANNEL_DYNAMIC: | |
530 | case SSH_CHANNEL_X11_LISTENER: | |
531 | case SSH_CHANNEL_PORT_LISTENER: | |
532 | case SSH_CHANNEL_RPORT_LISTENER: | |
533 | case SSH_CHANNEL_OPENING: | |
534 | case SSH_CHANNEL_CONNECTING: | |
535 | case SSH_CHANNEL_ZOMBIE: | |
536 | continue; | |
537 | case SSH_CHANNEL_LARVAL: | |
538 | case SSH_CHANNEL_AUTH_SOCKET: | |
539 | case SSH_CHANNEL_OPEN: | |
540 | case SSH_CHANNEL_X11_OPEN: | |
541 | return i; | |
542 | case SSH_CHANNEL_INPUT_DRAINING: | |
543 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
544 | if (!compat13) | |
545 | fatal("cannot happen: OUT_DRAIN"); | |
546 | return i; | |
547 | default: | |
548 | fatal("channel_find_open: bad channel type %d", c->type); | |
549 | /* NOTREACHED */ | |
550 | } | |
551 | } | |
552 | return -1; | |
553 | } | |
554 | ||
555 | ||
556 | /* | |
557 | * Returns a message describing the currently open forwarded connections, | |
558 | * suitable for sending to the client. The message contains crlf pairs for | |
559 | * newlines. | |
560 | */ | |
8e7895b8 | 561 | char * |
d5bb9418 | 562 | channel_open_message(void) |
8e7895b8 | 563 | { |
564 | Buffer buffer; | |
565 | Channel *c; | |
566 | char buf[1024], *cp; | |
9a995072 | 567 | u_int i; |
8e7895b8 | 568 | |
569 | buffer_init(&buffer); | |
570 | snprintf(buf, sizeof buf, "The following connections are open:\r\n"); | |
571 | buffer_append(&buffer, buf, strlen(buf)); | |
572 | for (i = 0; i < channels_alloc; i++) { | |
573 | c = channels[i]; | |
574 | if (c == NULL) | |
575 | continue; | |
576 | switch (c->type) { | |
577 | case SSH_CHANNEL_X11_LISTENER: | |
578 | case SSH_CHANNEL_PORT_LISTENER: | |
579 | case SSH_CHANNEL_RPORT_LISTENER: | |
580 | case SSH_CHANNEL_CLOSED: | |
581 | case SSH_CHANNEL_AUTH_SOCKET: | |
582 | case SSH_CHANNEL_ZOMBIE: | |
583 | continue; | |
584 | case SSH_CHANNEL_LARVAL: | |
585 | case SSH_CHANNEL_OPENING: | |
586 | case SSH_CHANNEL_CONNECTING: | |
587 | case SSH_CHANNEL_DYNAMIC: | |
588 | case SSH_CHANNEL_OPEN: | |
589 | case SSH_CHANNEL_X11_OPEN: | |
590 | case SSH_CHANNEL_INPUT_DRAINING: | |
591 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
5e96b616 | 592 | snprintf(buf, sizeof buf, |
593 | " #%d %.300s (t%d r%d i%d/%d o%d/%d fd %d/%d cfd %d)\r\n", | |
8e7895b8 | 594 | c->self, c->remote_name, |
595 | c->type, c->remote_id, | |
596 | c->istate, buffer_len(&c->input), | |
597 | c->ostate, buffer_len(&c->output), | |
5e96b616 | 598 | c->rfd, c->wfd, c->ctl_fd); |
8e7895b8 | 599 | buffer_append(&buffer, buf, strlen(buf)); |
600 | continue; | |
601 | default: | |
602 | fatal("channel_open_message: bad channel type %d", c->type); | |
603 | /* NOTREACHED */ | |
604 | } | |
605 | } | |
606 | buffer_append(&buffer, "\0", 1); | |
607 | cp = xstrdup(buffer_ptr(&buffer)); | |
608 | buffer_free(&buffer); | |
609 | return cp; | |
610 | } | |
611 | ||
612 | void | |
613 | channel_send_open(int id) | |
614 | { | |
615 | Channel *c = channel_lookup(id); | |
e1feb9bf | 616 | |
8e7895b8 | 617 | if (c == NULL) { |
bbe88b6d | 618 | logit("channel_send_open: %d: bad id", id); |
8e7895b8 | 619 | return; |
620 | } | |
6226a8f8 | 621 | debug2("channel %d: send open", id); |
8e7895b8 | 622 | packet_start(SSH2_MSG_CHANNEL_OPEN); |
623 | packet_put_cstring(c->ctype); | |
624 | packet_put_int(c->self); | |
625 | packet_put_int(c->local_window); | |
626 | packet_put_int(c->local_maxpacket); | |
627 | packet_send(); | |
628 | } | |
629 | ||
630 | void | |
6226a8f8 | 631 | channel_request_start(int id, char *service, int wantconfirm) |
8e7895b8 | 632 | { |
6226a8f8 | 633 | Channel *c = channel_lookup(id); |
e1feb9bf | 634 | |
8e7895b8 | 635 | if (c == NULL) { |
bbe88b6d | 636 | logit("channel_request_start: %d: unknown channel id", id); |
8e7895b8 | 637 | return; |
638 | } | |
5e96b616 | 639 | debug2("channel %d: request %s confirm %d", id, service, wantconfirm); |
8e7895b8 | 640 | packet_start(SSH2_MSG_CHANNEL_REQUEST); |
641 | packet_put_int(c->remote_id); | |
642 | packet_put_cstring(service); | |
643 | packet_put_char(wantconfirm); | |
644 | } | |
a7137f6b | 645 | |
8e7895b8 | 646 | void |
5e96b616 | 647 | channel_register_confirm(int id, channel_callback_fn *fn, void *ctx) |
8e7895b8 | 648 | { |
649 | Channel *c = channel_lookup(id); | |
e1feb9bf | 650 | |
8e7895b8 | 651 | if (c == NULL) { |
bbe88b6d | 652 | logit("channel_register_comfirm: %d: bad id", id); |
8e7895b8 | 653 | return; |
654 | } | |
05ca0898 | 655 | c->confirm = fn; |
5e96b616 | 656 | c->confirm_ctx = ctx; |
8e7895b8 | 657 | } |
a7137f6b | 658 | |
8e7895b8 | 659 | void |
8cd0437d | 660 | channel_register_cleanup(int id, channel_callback_fn *fn, int do_close) |
8e7895b8 | 661 | { |
b872f7f0 | 662 | Channel *c = channel_by_id(id); |
e1feb9bf | 663 | |
8e7895b8 | 664 | if (c == NULL) { |
bbe88b6d | 665 | logit("channel_register_cleanup: %d: bad id", id); |
8e7895b8 | 666 | return; |
667 | } | |
3cf2be58 | 668 | c->detach_user = fn; |
8cd0437d | 669 | c->detach_close = do_close; |
8e7895b8 | 670 | } |
a7137f6b | 671 | |
8e7895b8 | 672 | void |
673 | channel_cancel_cleanup(int id) | |
674 | { | |
b872f7f0 | 675 | Channel *c = channel_by_id(id); |
e1feb9bf | 676 | |
8e7895b8 | 677 | if (c == NULL) { |
bbe88b6d | 678 | logit("channel_cancel_cleanup: %d: bad id", id); |
8e7895b8 | 679 | return; |
680 | } | |
3cf2be58 | 681 | c->detach_user = NULL; |
8cd0437d | 682 | c->detach_close = 0; |
8e7895b8 | 683 | } |
a7137f6b | 684 | |
8e7895b8 | 685 | void |
c1c6a032 | 686 | channel_register_filter(int id, channel_infilter_fn *ifn, |
687 | channel_outfilter_fn *ofn) | |
8e7895b8 | 688 | { |
689 | Channel *c = channel_lookup(id); | |
e1feb9bf | 690 | |
8e7895b8 | 691 | if (c == NULL) { |
bbe88b6d | 692 | logit("channel_register_filter: %d: bad id", id); |
8e7895b8 | 693 | return; |
694 | } | |
c1c6a032 | 695 | c->input_filter = ifn; |
696 | c->output_filter = ofn; | |
8e7895b8 | 697 | } |
698 | ||
6ae2364d | 699 | void |
8e7895b8 | 700 | channel_set_fds(int id, int rfd, int wfd, int efd, |
399d1ea6 | 701 | int extusage, int nonblock, u_int window_max) |
8efc0c15 | 702 | { |
8e7895b8 | 703 | Channel *c = channel_lookup(id); |
e1feb9bf | 704 | |
8e7895b8 | 705 | if (c == NULL || c->type != SSH_CHANNEL_LARVAL) |
706 | fatal("channel_activate for non-larval channel %d.", id); | |
707 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock); | |
708 | c->type = SSH_CHANNEL_OPEN; | |
399d1ea6 | 709 | c->local_window = c->local_window_max = window_max; |
8e7895b8 | 710 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
711 | packet_put_int(c->remote_id); | |
712 | packet_put_int(c->local_window); | |
713 | packet_send(); | |
8efc0c15 | 714 | } |
715 | ||
aa3378df | 716 | /* |
7368a6c8 | 717 | * 'channel_pre*' are called just before select() to add any bits relevant to |
718 | * channels in the select bitmasks. | |
aa3378df | 719 | */ |
7368a6c8 | 720 | /* |
721 | * 'channel_post*': perform any appropriate operations for channels which | |
722 | * have events pending. | |
723 | */ | |
c8e9c167 | 724 | typedef void chan_fn(Channel *c, fd_set *readset, fd_set *writeset); |
7368a6c8 | 725 | chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE]; |
726 | chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE]; | |
8efc0c15 | 727 | |
396c147e | 728 | static void |
c8e9c167 | 729 | channel_pre_listener(Channel *c, fd_set *readset, fd_set *writeset) |
8efc0c15 | 730 | { |
7368a6c8 | 731 | FD_SET(c->sock, readset); |
732 | } | |
5260325f | 733 | |
396c147e | 734 | static void |
c8e9c167 | 735 | channel_pre_connecting(Channel *c, fd_set *readset, fd_set *writeset) |
97fb6912 | 736 | { |
737 | debug3("channel %d: waiting for connection", c->self); | |
738 | FD_SET(c->sock, writeset); | |
739 | } | |
740 | ||
396c147e | 741 | static void |
c8e9c167 | 742 | channel_pre_open_13(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 743 | { |
744 | if (buffer_len(&c->input) < packet_get_maxsize()) | |
745 | FD_SET(c->sock, readset); | |
746 | if (buffer_len(&c->output) > 0) | |
747 | FD_SET(c->sock, writeset); | |
748 | } | |
5260325f | 749 | |
396c147e | 750 | static void |
c8e9c167 | 751 | channel_pre_open(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 752 | { |
0c0738d5 | 753 | u_int limit = compat20 ? c->remote_window : packet_get_maxsize(); |
5260325f | 754 | |
7e7327a1 | 755 | if (c->istate == CHAN_INPUT_OPEN && |
0c0738d5 | 756 | limit > 0 && |
69d9d413 | 757 | buffer_len(&c->input) < limit && |
758 | buffer_check_alloc(&c->input, CHAN_RBUF)) | |
7e7327a1 | 759 | FD_SET(c->rfd, readset); |
760 | if (c->ostate == CHAN_OUTPUT_OPEN || | |
761 | c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { | |
762 | if (buffer_len(&c->output) > 0) { | |
763 | FD_SET(c->wfd, writeset); | |
764 | } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { | |
d2296ed7 | 765 | if (CHANNEL_EFD_OUTPUT_ACTIVE(c)) |
4e2e5cfd | 766 | debug2("channel %d: obuf_empty delayed efd %d/(%d)", |
767 | c->self, c->efd, buffer_len(&c->extended)); | |
d2296ed7 | 768 | else |
769 | chan_obuf_empty(c); | |
7e7327a1 | 770 | } |
771 | } | |
772 | /** XXX check close conditions, too */ | |
0c0738d5 | 773 | if (compat20 && c->efd != -1) { |
7e7327a1 | 774 | if (c->extended_usage == CHAN_EXTENDED_WRITE && |
775 | buffer_len(&c->extended) > 0) | |
776 | FD_SET(c->efd, writeset); | |
d2296ed7 | 777 | else if (!(c->flags & CHAN_EOF_SENT) && |
778 | c->extended_usage == CHAN_EXTENDED_READ && | |
7e7327a1 | 779 | buffer_len(&c->extended) < c->remote_window) |
780 | FD_SET(c->efd, readset); | |
781 | } | |
5e96b616 | 782 | /* XXX: What about efd? races? */ |
f2107e97 | 783 | if (compat20 && c->ctl_fd != -1 && |
5e96b616 | 784 | c->istate == CHAN_INPUT_OPEN && c->ostate == CHAN_OUTPUT_OPEN) |
785 | FD_SET(c->ctl_fd, readset); | |
7e7327a1 | 786 | } |
787 | ||
396c147e | 788 | static void |
c8e9c167 | 789 | channel_pre_input_draining(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 790 | { |
791 | if (buffer_len(&c->input) == 0) { | |
792 | packet_start(SSH_MSG_CHANNEL_CLOSE); | |
793 | packet_put_int(c->remote_id); | |
794 | packet_send(); | |
795 | c->type = SSH_CHANNEL_CLOSED; | |
d7ac5f18 | 796 | debug2("channel %d: closing after input drain.", c->self); |
7368a6c8 | 797 | } |
798 | } | |
5260325f | 799 | |
396c147e | 800 | static void |
c8e9c167 | 801 | channel_pre_output_draining(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 802 | { |
803 | if (buffer_len(&c->output) == 0) | |
719fc62f | 804 | chan_mark_dead(c); |
6ae2364d | 805 | else |
7368a6c8 | 806 | FD_SET(c->sock, writeset); |
807 | } | |
5260325f | 808 | |
7368a6c8 | 809 | /* |
810 | * This is a special state for X11 authentication spoofing. An opened X11 | |
811 | * connection (when authentication spoofing is being done) remains in this | |
812 | * state until the first packet has been completely read. The authentication | |
813 | * data in that packet is then substituted by the real data if it matches the | |
814 | * fake data, and the channel is put into normal mode. | |
0b242b12 | 815 | * XXX All this happens at the client side. |
8e7895b8 | 816 | * Returns: 0 = need more data, -1 = wrong cookie, 1 = ok |
7368a6c8 | 817 | */ |
396c147e | 818 | static int |
8e7895b8 | 819 | x11_open_helper(Buffer *b) |
7368a6c8 | 820 | { |
1e3b8b07 | 821 | u_char *ucp; |
822 | u_int proto_len, data_len; | |
5260325f | 823 | |
7368a6c8 | 824 | /* Check if the fixed size part of the packet is in buffer. */ |
8e7895b8 | 825 | if (buffer_len(b) < 12) |
7368a6c8 | 826 | return 0; |
827 | ||
828 | /* Parse the lengths of variable-length fields. */ | |
20905a8e | 829 | ucp = buffer_ptr(b); |
7368a6c8 | 830 | if (ucp[0] == 0x42) { /* Byte order MSB first. */ |
831 | proto_len = 256 * ucp[6] + ucp[7]; | |
832 | data_len = 256 * ucp[8] + ucp[9]; | |
833 | } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */ | |
834 | proto_len = ucp[6] + 256 * ucp[7]; | |
835 | data_len = ucp[8] + 256 * ucp[9]; | |
836 | } else { | |
d7ac5f18 | 837 | debug2("Initial X11 packet contains bad byte order byte: 0x%x", |
184eed6a | 838 | ucp[0]); |
7368a6c8 | 839 | return -1; |
840 | } | |
5260325f | 841 | |
7368a6c8 | 842 | /* Check if the whole packet is in buffer. */ |
8e7895b8 | 843 | if (buffer_len(b) < |
7368a6c8 | 844 | 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3)) |
845 | return 0; | |
5260325f | 846 | |
7368a6c8 | 847 | /* Check if authentication protocol matches. */ |
848 | if (proto_len != strlen(x11_saved_proto) || | |
849 | memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) { | |
d7ac5f18 | 850 | debug2("X11 connection uses different authentication protocol."); |
7368a6c8 | 851 | return -1; |
852 | } | |
853 | /* Check if authentication data matches our fake data. */ | |
854 | if (data_len != x11_fake_data_len || | |
855 | memcmp(ucp + 12 + ((proto_len + 3) & ~3), | |
856 | x11_fake_data, x11_fake_data_len) != 0) { | |
d7ac5f18 | 857 | debug2("X11 auth data does not match fake data."); |
7368a6c8 | 858 | return -1; |
859 | } | |
860 | /* Check fake data length */ | |
861 | if (x11_fake_data_len != x11_saved_data_len) { | |
862 | error("X11 fake_data_len %d != saved_data_len %d", | |
863 | x11_fake_data_len, x11_saved_data_len); | |
864 | return -1; | |
865 | } | |
866 | /* | |
867 | * Received authentication protocol and data match | |
868 | * our fake data. Substitute the fake data with real | |
869 | * data. | |
870 | */ | |
871 | memcpy(ucp + 12 + ((proto_len + 3) & ~3), | |
872 | x11_saved_data, x11_saved_data_len); | |
873 | return 1; | |
874 | } | |
5260325f | 875 | |
396c147e | 876 | static void |
c8e9c167 | 877 | channel_pre_x11_open_13(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 878 | { |
8e7895b8 | 879 | int ret = x11_open_helper(&c->output); |
e1feb9bf | 880 | |
7368a6c8 | 881 | if (ret == 1) { |
882 | /* Start normal processing for the channel. */ | |
883 | c->type = SSH_CHANNEL_OPEN; | |
a8be9f80 | 884 | channel_pre_open_13(c, readset, writeset); |
7368a6c8 | 885 | } else if (ret == -1) { |
886 | /* | |
887 | * We have received an X11 connection that has bad | |
888 | * authentication information. | |
889 | */ | |
bbe88b6d | 890 | logit("X11 connection rejected because of wrong authentication."); |
7368a6c8 | 891 | buffer_clear(&c->input); |
892 | buffer_clear(&c->output); | |
489aa2e9 | 893 | channel_close_fd(&c->sock); |
7368a6c8 | 894 | c->sock = -1; |
895 | c->type = SSH_CHANNEL_CLOSED; | |
896 | packet_start(SSH_MSG_CHANNEL_CLOSE); | |
897 | packet_put_int(c->remote_id); | |
898 | packet_send(); | |
899 | } | |
900 | } | |
5260325f | 901 | |
396c147e | 902 | static void |
c8e9c167 | 903 | channel_pre_x11_open(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 904 | { |
8e7895b8 | 905 | int ret = x11_open_helper(&c->output); |
a5f82435 | 906 | |
907 | /* c->force_drain = 1; */ | |
908 | ||
7368a6c8 | 909 | if (ret == 1) { |
910 | c->type = SSH_CHANNEL_OPEN; | |
0c0738d5 | 911 | channel_pre_open(c, readset, writeset); |
7368a6c8 | 912 | } else if (ret == -1) { |
bbe88b6d | 913 | logit("X11 connection rejected because of wrong authentication."); |
d7ac5f18 | 914 | debug2("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate); |
8341f420 | 915 | chan_read_failed(c); |
916 | buffer_clear(&c->input); | |
917 | chan_ibuf_empty(c); | |
918 | buffer_clear(&c->output); | |
919 | /* for proto v1, the peer will send an IEOF */ | |
920 | if (compat20) | |
921 | chan_write_failed(c); | |
922 | else | |
923 | c->type = SSH_CHANNEL_OPEN; | |
d7ac5f18 | 924 | debug2("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate); |
7368a6c8 | 925 | } |
926 | } | |
5260325f | 927 | |
28b9cb4d | 928 | /* try to decode a socks4 header */ |
396c147e | 929 | static int |
c8e9c167 | 930 | channel_decode_socks4(Channel *c, fd_set *readset, fd_set *writeset) |
0490e609 | 931 | { |
661e45a0 | 932 | char *p, *host; |
2ceb8101 | 933 | u_int len, have, i, found; |
184eed6a | 934 | char username[256]; |
0490e609 | 935 | struct { |
936 | u_int8_t version; | |
937 | u_int8_t command; | |
938 | u_int16_t dest_port; | |
28b9cb4d | 939 | struct in_addr dest_addr; |
0490e609 | 940 | } s4_req, s4_rsp; |
941 | ||
28b9cb4d | 942 | debug2("channel %d: decode socks4", c->self); |
53b8fe68 | 943 | |
944 | have = buffer_len(&c->input); | |
945 | len = sizeof(s4_req); | |
946 | if (have < len) | |
947 | return 0; | |
948 | p = buffer_ptr(&c->input); | |
949 | for (found = 0, i = len; i < have; i++) { | |
950 | if (p[i] == '\0') { | |
951 | found = 1; | |
952 | break; | |
953 | } | |
954 | if (i > 1024) { | |
955 | /* the peer is probably sending garbage */ | |
956 | debug("channel %d: decode socks4: too long", | |
957 | c->self); | |
958 | return -1; | |
959 | } | |
960 | } | |
961 | if (!found) | |
962 | return 0; | |
0490e609 | 963 | buffer_get(&c->input, (char *)&s4_req.version, 1); |
964 | buffer_get(&c->input, (char *)&s4_req.command, 1); | |
965 | buffer_get(&c->input, (char *)&s4_req.dest_port, 2); | |
28b9cb4d | 966 | buffer_get(&c->input, (char *)&s4_req.dest_addr, 4); |
53b8fe68 | 967 | have = buffer_len(&c->input); |
0490e609 | 968 | p = buffer_ptr(&c->input); |
969 | len = strlen(p); | |
6683b40f | 970 | debug2("channel %d: decode socks4: user %s/%d", c->self, p, len); |
0490e609 | 971 | if (len > have) |
28b9cb4d | 972 | fatal("channel %d: decode socks4: len %d > have %d", |
0490e609 | 973 | c->self, len, have); |
974 | strlcpy(username, p, sizeof(username)); | |
975 | buffer_consume(&c->input, len); | |
976 | buffer_consume(&c->input, 1); /* trailing '\0' */ | |
977 | ||
28b9cb4d | 978 | host = inet_ntoa(s4_req.dest_addr); |
0490e609 | 979 | strlcpy(c->path, host, sizeof(c->path)); |
980 | c->host_port = ntohs(s4_req.dest_port); | |
184eed6a | 981 | |
d7ac5f18 | 982 | debug2("channel %d: dynamic request: socks4 host %s port %u command %u", |
6683b40f | 983 | c->self, host, c->host_port, s4_req.command); |
0490e609 | 984 | |
28b9cb4d | 985 | if (s4_req.command != 1) { |
986 | debug("channel %d: cannot handle: socks4 cn %d", | |
987 | c->self, s4_req.command); | |
988 | return -1; | |
0490e609 | 989 | } |
28b9cb4d | 990 | s4_rsp.version = 0; /* vn: 0 for reply */ |
991 | s4_rsp.command = 90; /* cd: req granted */ | |
0490e609 | 992 | s4_rsp.dest_port = 0; /* ignored */ |
28b9cb4d | 993 | s4_rsp.dest_addr.s_addr = INADDR_ANY; /* ignored */ |
15dd2c4f | 994 | buffer_append(&c->output, &s4_rsp, sizeof(s4_rsp)); |
28b9cb4d | 995 | return 1; |
0490e609 | 996 | } |
997 | ||
f49658f5 | 998 | /* try to decode a socks5 header */ |
999 | #define SSH_SOCKS5_AUTHDONE 0x1000 | |
1000 | #define SSH_SOCKS5_NOAUTH 0x00 | |
1001 | #define SSH_SOCKS5_IPV4 0x01 | |
1002 | #define SSH_SOCKS5_DOMAIN 0x03 | |
1003 | #define SSH_SOCKS5_IPV6 0x04 | |
1004 | #define SSH_SOCKS5_CONNECT 0x01 | |
1005 | #define SSH_SOCKS5_SUCCESS 0x00 | |
1006 | ||
1007 | static int | |
c8e9c167 | 1008 | channel_decode_socks5(Channel *c, fd_set *readset, fd_set *writeset) |
f49658f5 | 1009 | { |
1010 | struct { | |
1011 | u_int8_t version; | |
1012 | u_int8_t command; | |
1013 | u_int8_t reserved; | |
1014 | u_int8_t atyp; | |
1015 | } s5_req, s5_rsp; | |
1016 | u_int16_t dest_port; | |
1017 | u_char *p, dest_addr[255+1]; | |
a217e418 | 1018 | u_int have, need, i, found, nmethods, addrlen, af; |
f49658f5 | 1019 | |
1020 | debug2("channel %d: decode socks5", c->self); | |
1021 | p = buffer_ptr(&c->input); | |
1022 | if (p[0] != 0x05) | |
1023 | return -1; | |
1024 | have = buffer_len(&c->input); | |
1025 | if (!(c->flags & SSH_SOCKS5_AUTHDONE)) { | |
1026 | /* format: ver | nmethods | methods */ | |
aff51935 | 1027 | if (have < 2) |
f49658f5 | 1028 | return 0; |
1029 | nmethods = p[1]; | |
1030 | if (have < nmethods + 2) | |
1031 | return 0; | |
1032 | /* look for method: "NO AUTHENTICATION REQUIRED" */ | |
1033 | for (found = 0, i = 2 ; i < nmethods + 2; i++) { | |
1034 | if (p[i] == SSH_SOCKS5_NOAUTH ) { | |
1035 | found = 1; | |
1036 | break; | |
1037 | } | |
1038 | } | |
1039 | if (!found) { | |
1040 | debug("channel %d: method SSH_SOCKS5_NOAUTH not found", | |
1041 | c->self); | |
1042 | return -1; | |
1043 | } | |
1044 | buffer_consume(&c->input, nmethods + 2); | |
1045 | buffer_put_char(&c->output, 0x05); /* version */ | |
1046 | buffer_put_char(&c->output, SSH_SOCKS5_NOAUTH); /* method */ | |
1047 | FD_SET(c->sock, writeset); | |
1048 | c->flags |= SSH_SOCKS5_AUTHDONE; | |
1049 | debug2("channel %d: socks5 auth done", c->self); | |
1050 | return 0; /* need more */ | |
1051 | } | |
1052 | debug2("channel %d: socks5 post auth", c->self); | |
1053 | if (have < sizeof(s5_req)+1) | |
1054 | return 0; /* need more */ | |
5b5f6af7 | 1055 | memcpy(&s5_req, p, sizeof(s5_req)); |
f49658f5 | 1056 | if (s5_req.version != 0x05 || |
1057 | s5_req.command != SSH_SOCKS5_CONNECT || | |
1058 | s5_req.reserved != 0x00) { | |
d7ac5f18 | 1059 | debug2("channel %d: only socks5 connect supported", c->self); |
f49658f5 | 1060 | return -1; |
1061 | } | |
f8cc7664 | 1062 | switch (s5_req.atyp){ |
f49658f5 | 1063 | case SSH_SOCKS5_IPV4: |
1064 | addrlen = 4; | |
1065 | af = AF_INET; | |
1066 | break; | |
1067 | case SSH_SOCKS5_DOMAIN: | |
1068 | addrlen = p[sizeof(s5_req)]; | |
1069 | af = -1; | |
1070 | break; | |
1071 | case SSH_SOCKS5_IPV6: | |
1072 | addrlen = 16; | |
1073 | af = AF_INET6; | |
1074 | break; | |
1075 | default: | |
d7ac5f18 | 1076 | debug2("channel %d: bad socks5 atyp %d", c->self, s5_req.atyp); |
f49658f5 | 1077 | return -1; |
1078 | } | |
a217e418 | 1079 | need = sizeof(s5_req) + addrlen + 2; |
1080 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) | |
1081 | need++; | |
1082 | if (have < need) | |
f49658f5 | 1083 | return 0; |
1084 | buffer_consume(&c->input, sizeof(s5_req)); | |
1085 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) | |
1086 | buffer_consume(&c->input, 1); /* host string length */ | |
1087 | buffer_get(&c->input, (char *)&dest_addr, addrlen); | |
1088 | buffer_get(&c->input, (char *)&dest_port, 2); | |
1089 | dest_addr[addrlen] = '\0'; | |
1090 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) | |
f6be21a0 | 1091 | strlcpy(c->path, (char *)dest_addr, sizeof(c->path)); |
f49658f5 | 1092 | else if (inet_ntop(af, dest_addr, c->path, sizeof(c->path)) == NULL) |
1093 | return -1; | |
1094 | c->host_port = ntohs(dest_port); | |
b6453d99 | 1095 | |
d7ac5f18 | 1096 | debug2("channel %d: dynamic request: socks5 host %s port %u command %u", |
f49658f5 | 1097 | c->self, c->path, c->host_port, s5_req.command); |
1098 | ||
1099 | s5_rsp.version = 0x05; | |
1100 | s5_rsp.command = SSH_SOCKS5_SUCCESS; | |
1101 | s5_rsp.reserved = 0; /* ignored */ | |
1102 | s5_rsp.atyp = SSH_SOCKS5_IPV4; | |
1103 | ((struct in_addr *)&dest_addr)->s_addr = INADDR_ANY; | |
1104 | dest_port = 0; /* ignored */ | |
1105 | ||
15dd2c4f | 1106 | buffer_append(&c->output, &s5_rsp, sizeof(s5_rsp)); |
1107 | buffer_append(&c->output, &dest_addr, sizeof(struct in_addr)); | |
1108 | buffer_append(&c->output, &dest_port, sizeof(dest_port)); | |
f49658f5 | 1109 | return 1; |
1110 | } | |
1111 | ||
28b9cb4d | 1112 | /* dynamic port forwarding */ |
396c147e | 1113 | static void |
c8e9c167 | 1114 | channel_pre_dynamic(Channel *c, fd_set *readset, fd_set *writeset) |
28b9cb4d | 1115 | { |
1116 | u_char *p; | |
2ceb8101 | 1117 | u_int have; |
1118 | int ret; | |
28b9cb4d | 1119 | |
1120 | have = buffer_len(&c->input); | |
639cb8ab | 1121 | c->delayed = 0; |
28b9cb4d | 1122 | debug2("channel %d: pre_dynamic: have %d", c->self, have); |
070adba2 | 1123 | /* buffer_dump(&c->input); */ |
28b9cb4d | 1124 | /* check if the fixed size part of the packet is in buffer. */ |
f49658f5 | 1125 | if (have < 3) { |
28b9cb4d | 1126 | /* need more */ |
1127 | FD_SET(c->sock, readset); | |
1128 | return; | |
1129 | } | |
1130 | /* try to guess the protocol */ | |
1131 | p = buffer_ptr(&c->input); | |
1132 | switch (p[0]) { | |
6683b40f | 1133 | case 0x04: |
1134 | ret = channel_decode_socks4(c, readset, writeset); | |
1135 | break; | |
f49658f5 | 1136 | case 0x05: |
1137 | ret = channel_decode_socks5(c, readset, writeset); | |
1138 | break; | |
28b9cb4d | 1139 | default: |
1140 | ret = -1; | |
1141 | break; | |
1142 | } | |
1143 | if (ret < 0) { | |
719fc62f | 1144 | chan_mark_dead(c); |
28b9cb4d | 1145 | } else if (ret == 0) { |
1146 | debug2("channel %d: pre_dynamic: need more", c->self); | |
1147 | /* need more */ | |
1148 | FD_SET(c->sock, readset); | |
1149 | } else { | |
1150 | /* switch to the next state */ | |
1151 | c->type = SSH_CHANNEL_OPENING; | |
1152 | port_open_helper(c, "direct-tcpip"); | |
1153 | } | |
1154 | } | |
0490e609 | 1155 | |
7368a6c8 | 1156 | /* This is our fake X11 server socket. */ |
396c147e | 1157 | static void |
c8e9c167 | 1158 | channel_post_x11_listener(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1159 | { |
719fc62f | 1160 | Channel *nc; |
7368a6c8 | 1161 | struct sockaddr addr; |
bcc0381e | 1162 | int newsock; |
7368a6c8 | 1163 | socklen_t addrlen; |
865ac82e | 1164 | char buf[16384], *remote_ipaddr; |
0b242b12 | 1165 | int remote_port; |
7368a6c8 | 1166 | |
1167 | if (FD_ISSET(c->sock, readset)) { | |
1168 | debug("X11 connection requested."); | |
1169 | addrlen = sizeof(addr); | |
1170 | newsock = accept(c->sock, &addr, &addrlen); | |
ac151b18 | 1171 | if (c->single_connection) { |
d7ac5f18 | 1172 | debug2("single_connection: closing X11 listener."); |
ac151b18 | 1173 | channel_close_fd(&c->sock); |
1174 | chan_mark_dead(c); | |
1175 | } | |
7368a6c8 | 1176 | if (newsock < 0) { |
1177 | error("accept: %.100s", strerror(errno)); | |
1178 | return; | |
5260325f | 1179 | } |
bcc0381e | 1180 | set_nodelay(newsock); |
865ac82e | 1181 | remote_ipaddr = get_peer_ipaddr(newsock); |
0b242b12 | 1182 | remote_port = get_peer_port(newsock); |
7368a6c8 | 1183 | snprintf(buf, sizeof buf, "X11 connection from %.200s port %d", |
865ac82e | 1184 | remote_ipaddr, remote_port); |
0b242b12 | 1185 | |
719fc62f | 1186 | nc = channel_new("accepted x11 socket", |
0b242b12 | 1187 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
0d942eff | 1188 | c->local_window_max, c->local_maxpacket, 0, buf, 1); |
0b242b12 | 1189 | if (compat20) { |
1190 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1191 | packet_put_cstring("x11"); | |
719fc62f | 1192 | packet_put_int(nc->self); |
ac151b18 | 1193 | packet_put_int(nc->local_window_max); |
1194 | packet_put_int(nc->local_maxpacket); | |
865ac82e | 1195 | /* originator ipaddr and port */ |
1196 | packet_put_cstring(remote_ipaddr); | |
d0c832f3 | 1197 | if (datafellows & SSH_BUG_X11FWD) { |
d7ac5f18 | 1198 | debug2("ssh2 x11 bug compat mode"); |
d0c832f3 | 1199 | } else { |
1200 | packet_put_int(remote_port); | |
1201 | } | |
0b242b12 | 1202 | packet_send(); |
1203 | } else { | |
1204 | packet_start(SSH_SMSG_X11_OPEN); | |
719fc62f | 1205 | packet_put_int(nc->self); |
8e7895b8 | 1206 | if (packet_get_protocol_flags() & |
1207 | SSH_PROTOFLAG_HOST_IN_FWD_OPEN) | |
449c5ba5 | 1208 | packet_put_cstring(buf); |
0b242b12 | 1209 | packet_send(); |
1210 | } | |
865ac82e | 1211 | xfree(remote_ipaddr); |
8efc0c15 | 1212 | } |
8efc0c15 | 1213 | } |
1214 | ||
396c147e | 1215 | static void |
0490e609 | 1216 | port_open_helper(Channel *c, char *rtype) |
1217 | { | |
1218 | int direct; | |
1219 | char buf[1024]; | |
1220 | char *remote_ipaddr = get_peer_ipaddr(c->sock); | |
29798ed0 | 1221 | int remote_port = get_peer_port(c->sock); |
0490e609 | 1222 | |
1223 | direct = (strcmp(rtype, "direct-tcpip") == 0); | |
1224 | ||
1225 | snprintf(buf, sizeof buf, | |
1226 | "%s: listening port %d for %.100s port %d, " | |
1227 | "connect from %.200s port %d", | |
1228 | rtype, c->listening_port, c->path, c->host_port, | |
1229 | remote_ipaddr, remote_port); | |
1230 | ||
1231 | xfree(c->remote_name); | |
1232 | c->remote_name = xstrdup(buf); | |
1233 | ||
1234 | if (compat20) { | |
1235 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1236 | packet_put_cstring(rtype); | |
1237 | packet_put_int(c->self); | |
1238 | packet_put_int(c->local_window_max); | |
1239 | packet_put_int(c->local_maxpacket); | |
1240 | if (direct) { | |
1241 | /* target host, port */ | |
1242 | packet_put_cstring(c->path); | |
1243 | packet_put_int(c->host_port); | |
1244 | } else { | |
1245 | /* listen address, port */ | |
1246 | packet_put_cstring(c->path); | |
1247 | packet_put_int(c->listening_port); | |
1248 | } | |
1249 | /* originator host and port */ | |
1250 | packet_put_cstring(remote_ipaddr); | |
29798ed0 | 1251 | packet_put_int((u_int)remote_port); |
0490e609 | 1252 | packet_send(); |
1253 | } else { | |
1254 | packet_start(SSH_MSG_PORT_OPEN); | |
1255 | packet_put_int(c->self); | |
1256 | packet_put_cstring(c->path); | |
1257 | packet_put_int(c->host_port); | |
8e7895b8 | 1258 | if (packet_get_protocol_flags() & |
1259 | SSH_PROTOFLAG_HOST_IN_FWD_OPEN) | |
0490e609 | 1260 | packet_put_cstring(c->remote_name); |
1261 | packet_send(); | |
1262 | } | |
1263 | xfree(remote_ipaddr); | |
1264 | } | |
1265 | ||
442aee3a | 1266 | static void |
1267 | channel_set_reuseaddr(int fd) | |
1268 | { | |
1269 | int on = 1; | |
1270 | ||
1271 | /* | |
1272 | * Set socket options. | |
1273 | * Allow local port reuse in TIME_WAIT. | |
1274 | */ | |
1275 | if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1) | |
1276 | error("setsockopt SO_REUSEADDR fd %d: %s", fd, strerror(errno)); | |
1277 | } | |
1278 | ||
aa3378df | 1279 | /* |
7368a6c8 | 1280 | * This socket is listening for connections to a forwarded TCP/IP port. |
aa3378df | 1281 | */ |
396c147e | 1282 | static void |
c8e9c167 | 1283 | channel_post_port_listener(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1284 | { |
0490e609 | 1285 | Channel *nc; |
7368a6c8 | 1286 | struct sockaddr addr; |
719fc62f | 1287 | int newsock, nextstate; |
7368a6c8 | 1288 | socklen_t addrlen; |
0490e609 | 1289 | char *rtype; |
fa08c86b | 1290 | |
7368a6c8 | 1291 | if (FD_ISSET(c->sock, readset)) { |
1292 | debug("Connection to port %d forwarding " | |
1293 | "to %.100s port %d requested.", | |
1294 | c->listening_port, c->path, c->host_port); | |
0490e609 | 1295 | |
639cb8ab | 1296 | if (c->type == SSH_CHANNEL_RPORT_LISTENER) { |
1297 | nextstate = SSH_CHANNEL_OPENING; | |
1298 | rtype = "forwarded-tcpip"; | |
1299 | } else { | |
1300 | if (c->host_port == 0) { | |
1301 | nextstate = SSH_CHANNEL_DYNAMIC; | |
f3964cb9 | 1302 | rtype = "dynamic-tcpip"; |
639cb8ab | 1303 | } else { |
1304 | nextstate = SSH_CHANNEL_OPENING; | |
1305 | rtype = "direct-tcpip"; | |
1306 | } | |
1307 | } | |
0490e609 | 1308 | |
7368a6c8 | 1309 | addrlen = sizeof(addr); |
1310 | newsock = accept(c->sock, &addr, &addrlen); | |
1311 | if (newsock < 0) { | |
1312 | error("accept: %.100s", strerror(errno)); | |
1313 | return; | |
1314 | } | |
811a6342 | 1315 | set_nodelay(newsock); |
0d942eff | 1316 | nc = channel_new(rtype, nextstate, newsock, newsock, -1, |
1317 | c->local_window_max, c->local_maxpacket, 0, rtype, 1); | |
0490e609 | 1318 | nc->listening_port = c->listening_port; |
1319 | nc->host_port = c->host_port; | |
1320 | strlcpy(nc->path, c->path, sizeof(nc->path)); | |
1321 | ||
639cb8ab | 1322 | if (nextstate == SSH_CHANNEL_DYNAMIC) { |
1323 | /* | |
1324 | * do not call the channel_post handler until | |
1325 | * this flag has been reset by a pre-handler. | |
1326 | * otherwise the FD_ISSET calls might overflow | |
1327 | */ | |
1328 | nc->delayed = 1; | |
1329 | } else { | |
0490e609 | 1330 | port_open_helper(nc, rtype); |
639cb8ab | 1331 | } |
7368a6c8 | 1332 | } |
1333 | } | |
8efc0c15 | 1334 | |
7368a6c8 | 1335 | /* |
1336 | * This is the authentication agent socket listening for connections from | |
1337 | * clients. | |
1338 | */ | |
396c147e | 1339 | static void |
c8e9c167 | 1340 | channel_post_auth_listener(Channel *c, fd_set *readset, fd_set *writeset) |
8efc0c15 | 1341 | { |
719fc62f | 1342 | Channel *nc; |
1343 | int newsock; | |
5260325f | 1344 | struct sockaddr addr; |
48e671d5 | 1345 | socklen_t addrlen; |
5260325f | 1346 | |
7368a6c8 | 1347 | if (FD_ISSET(c->sock, readset)) { |
1348 | addrlen = sizeof(addr); | |
1349 | newsock = accept(c->sock, &addr, &addrlen); | |
1350 | if (newsock < 0) { | |
1351 | error("accept from auth socket: %.100s", strerror(errno)); | |
1352 | return; | |
1353 | } | |
719fc62f | 1354 | nc = channel_new("accepted auth socket", |
fa08c86b | 1355 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
1356 | c->local_window_max, c->local_maxpacket, | |
0d942eff | 1357 | 0, "accepted auth socket", 1); |
fa08c86b | 1358 | if (compat20) { |
1359 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1360 | packet_put_cstring("auth-agent@openssh.com"); | |
719fc62f | 1361 | packet_put_int(nc->self); |
fa08c86b | 1362 | packet_put_int(c->local_window_max); |
1363 | packet_put_int(c->local_maxpacket); | |
1364 | } else { | |
1365 | packet_start(SSH_SMSG_AGENT_OPEN); | |
719fc62f | 1366 | packet_put_int(nc->self); |
fa08c86b | 1367 | } |
7368a6c8 | 1368 | packet_send(); |
1369 | } | |
1370 | } | |
5260325f | 1371 | |
396c147e | 1372 | static void |
c8e9c167 | 1373 | channel_post_connecting(Channel *c, fd_set *readset, fd_set *writeset) |
97fb6912 | 1374 | { |
d18e0850 | 1375 | int err = 0; |
8ab2cb35 | 1376 | socklen_t sz = sizeof(err); |
d18e0850 | 1377 | |
97fb6912 | 1378 | if (FD_ISSET(c->sock, writeset)) { |
db518d9b | 1379 | if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, &err, &sz) < 0) { |
d18e0850 | 1380 | err = errno; |
1381 | error("getsockopt SO_ERROR failed"); | |
1382 | } | |
1383 | if (err == 0) { | |
1384 | debug("channel %d: connected", c->self); | |
1385 | c->type = SSH_CHANNEL_OPEN; | |
1386 | if (compat20) { | |
1387 | packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1388 | packet_put_int(c->remote_id); | |
1389 | packet_put_int(c->self); | |
1390 | packet_put_int(c->local_window); | |
1391 | packet_put_int(c->local_maxpacket); | |
1392 | } else { | |
1393 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1394 | packet_put_int(c->remote_id); | |
1395 | packet_put_int(c->self); | |
1396 | } | |
97fb6912 | 1397 | } else { |
d18e0850 | 1398 | debug("channel %d: not connected: %s", |
1399 | c->self, strerror(err)); | |
1400 | if (compat20) { | |
1401 | packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); | |
1402 | packet_put_int(c->remote_id); | |
1403 | packet_put_int(SSH2_OPEN_CONNECT_FAILED); | |
1404 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { | |
1405 | packet_put_cstring(strerror(err)); | |
1406 | packet_put_cstring(""); | |
1407 | } | |
97fb6912 | 1408 | } else { |
d18e0850 | 1409 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
1410 | packet_put_int(c->remote_id); | |
97fb6912 | 1411 | } |
d18e0850 | 1412 | chan_mark_dead(c); |
97fb6912 | 1413 | } |
d18e0850 | 1414 | packet_send(); |
97fb6912 | 1415 | } |
1416 | } | |
1417 | ||
396c147e | 1418 | static int |
c8e9c167 | 1419 | channel_handle_rfd(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1420 | { |
fa1d7d85 | 1421 | char buf[CHAN_RBUF]; |
7368a6c8 | 1422 | int len; |
1423 | ||
6fd8622b | 1424 | if (c->rfd != -1 && |
7368a6c8 | 1425 | FD_ISSET(c->rfd, readset)) { |
ea8c44d9 | 1426 | errno = 0; |
7368a6c8 | 1427 | len = read(c->rfd, buf, sizeof(buf)); |
0fbe8c74 | 1428 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
1429 | return 1; | |
ea8c44d9 | 1430 | #ifndef PTY_ZEROREAD |
7368a6c8 | 1431 | if (len <= 0) { |
ea8c44d9 | 1432 | #else |
9c04d67d | 1433 | if ((!c->isatty && len <= 0) || |
1434 | (c->isatty && (len < 0 || (len == 0 && errno != 0)))) { | |
ea8c44d9 | 1435 | #endif |
d7ac5f18 | 1436 | debug2("channel %d: read<=0 rfd %d len %d", |
7368a6c8 | 1437 | c->self, c->rfd, len); |
28b9cb4d | 1438 | if (c->type != SSH_CHANNEL_OPEN) { |
d7ac5f18 | 1439 | debug2("channel %d: not open", c->self); |
719fc62f | 1440 | chan_mark_dead(c); |
0490e609 | 1441 | return -1; |
28b9cb4d | 1442 | } else if (compat13) { |
9c50edcf | 1443 | buffer_clear(&c->output); |
7368a6c8 | 1444 | c->type = SSH_CHANNEL_INPUT_DRAINING; |
d7ac5f18 | 1445 | debug2("channel %d: input draining.", c->self); |
7368a6c8 | 1446 | } else { |
1447 | chan_read_failed(c); | |
5260325f | 1448 | } |
7368a6c8 | 1449 | return -1; |
1450 | } | |
6aacefa7 | 1451 | if (c->input_filter != NULL) { |
2e73a022 | 1452 | if (c->input_filter(c, buf, len) == -1) { |
d7ac5f18 | 1453 | debug2("channel %d: filter stops", c->self); |
2e73a022 | 1454 | chan_read_failed(c); |
1455 | } | |
d20f3c9e | 1456 | } else if (c->datagram) { |
1457 | buffer_put_string(&c->input, buf, len); | |
2e73a022 | 1458 | } else { |
1459 | buffer_append(&c->input, buf, len); | |
1460 | } | |
7368a6c8 | 1461 | } |
1462 | return 1; | |
1463 | } | |
a7137f6b | 1464 | |
396c147e | 1465 | static int |
c8e9c167 | 1466 | channel_handle_wfd(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1467 | { |
95ce5599 | 1468 | struct termios tio; |
c1c6a032 | 1469 | u_char *data = NULL, *buf; |
780a9951 | 1470 | u_int dlen; |
7368a6c8 | 1471 | int len; |
1472 | ||
1473 | /* Send buffered output data to the socket. */ | |
6fd8622b | 1474 | if (c->wfd != -1 && |
7368a6c8 | 1475 | FD_ISSET(c->wfd, writeset) && |
1476 | buffer_len(&c->output) > 0) { | |
c1c6a032 | 1477 | if (c->output_filter != NULL) { |
1478 | if ((buf = c->output_filter(c, &data, &dlen)) == NULL) { | |
1479 | debug2("channel %d: filter stops", c->self); | |
d7b37427 | 1480 | if (c->type != SSH_CHANNEL_OPEN) |
1481 | chan_mark_dead(c); | |
1482 | else | |
1483 | chan_write_failed(c); | |
1484 | return -1; | |
c1c6a032 | 1485 | } |
1486 | } else if (c->datagram) { | |
1487 | buf = data = buffer_get_string(&c->output, &dlen); | |
1488 | } else { | |
1489 | buf = data = buffer_ptr(&c->output); | |
1490 | dlen = buffer_len(&c->output); | |
1491 | } | |
1492 | ||
d20f3c9e | 1493 | if (c->datagram) { |
d20f3c9e | 1494 | /* ignore truncated writes, datagrams might get lost */ |
1495 | c->local_consumed += dlen + 4; | |
c1c6a032 | 1496 | len = write(c->wfd, buf, dlen); |
d20f3c9e | 1497 | xfree(data); |
1498 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) | |
1499 | return 1; | |
1500 | if (len <= 0) { | |
1501 | if (c->type != SSH_CHANNEL_OPEN) | |
1502 | chan_mark_dead(c); | |
1503 | else | |
1504 | chan_write_failed(c); | |
1505 | return -1; | |
1506 | } | |
1507 | return 1; | |
1508 | } | |
64c0ce80 | 1509 | #ifdef _AIX |
aff51935 | 1510 | /* XXX: Later AIX versions can't push as much data to tty */ |
7fbb4189 | 1511 | if (compat20 && c->wfd_isatty) |
1512 | dlen = MIN(dlen, 8*1024); | |
64c0ce80 | 1513 | #endif |
c1c6a032 | 1514 | |
1515 | len = write(c->wfd, buf, dlen); | |
0fbe8c74 | 1516 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
1517 | return 1; | |
7368a6c8 | 1518 | if (len <= 0) { |
28b9cb4d | 1519 | if (c->type != SSH_CHANNEL_OPEN) { |
d7ac5f18 | 1520 | debug2("channel %d: not open", c->self); |
719fc62f | 1521 | chan_mark_dead(c); |
28b9cb4d | 1522 | return -1; |
1523 | } else if (compat13) { | |
9c50edcf | 1524 | buffer_clear(&c->output); |
d7ac5f18 | 1525 | debug2("channel %d: input draining.", c->self); |
7368a6c8 | 1526 | c->type = SSH_CHANNEL_INPUT_DRAINING; |
1527 | } else { | |
1528 | chan_write_failed(c); | |
5260325f | 1529 | } |
7368a6c8 | 1530 | return -1; |
1531 | } | |
c1c6a032 | 1532 | if (compat20 && c->isatty && dlen >= 1 && buf[0] != '\r') { |
0ae4fe1d | 1533 | if (tcgetattr(c->wfd, &tio) == 0 && |
1534 | !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) { | |
1535 | /* | |
1536 | * Simulate echo to reduce the impact of | |
355724fc | 1537 | * traffic analysis. We need to match the |
95ce5599 | 1538 | * size of a SSH2_MSG_CHANNEL_DATA message |
c1c6a032 | 1539 | * (4 byte channel id + buf) |
0ae4fe1d | 1540 | */ |
95ce5599 | 1541 | packet_send_ignore(4 + len); |
0ae4fe1d | 1542 | packet_send(); |
0ae4fe1d | 1543 | } |
1544 | } | |
7368a6c8 | 1545 | buffer_consume(&c->output, len); |
7e7327a1 | 1546 | if (compat20 && len > 0) { |
1547 | c->local_consumed += len; | |
1548 | } | |
1549 | } | |
1550 | return 1; | |
1551 | } | |
a7137f6b | 1552 | |
396c147e | 1553 | static int |
c8e9c167 | 1554 | channel_handle_efd(Channel *c, fd_set *readset, fd_set *writeset) |
7e7327a1 | 1555 | { |
fa1d7d85 | 1556 | char buf[CHAN_RBUF]; |
7e7327a1 | 1557 | int len; |
1558 | ||
8ce64345 | 1559 | /** XXX handle drain efd, too */ |
7e7327a1 | 1560 | if (c->efd != -1) { |
1561 | if (c->extended_usage == CHAN_EXTENDED_WRITE && | |
1562 | FD_ISSET(c->efd, writeset) && | |
1563 | buffer_len(&c->extended) > 0) { | |
1564 | len = write(c->efd, buffer_ptr(&c->extended), | |
1565 | buffer_len(&c->extended)); | |
de273eef | 1566 | debug2("channel %d: written %d to efd %d", |
7e7327a1 | 1567 | c->self, len, c->efd); |
ee55dacf | 1568 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
1569 | return 1; | |
1570 | if (len <= 0) { | |
1571 | debug2("channel %d: closing write-efd %d", | |
1572 | c->self, c->efd); | |
489aa2e9 | 1573 | channel_close_fd(&c->efd); |
ee55dacf | 1574 | } else { |
7e7327a1 | 1575 | buffer_consume(&c->extended, len); |
1576 | c->local_consumed += len; | |
1577 | } | |
1578 | } else if (c->extended_usage == CHAN_EXTENDED_READ && | |
1579 | FD_ISSET(c->efd, readset)) { | |
1580 | len = read(c->efd, buf, sizeof(buf)); | |
de273eef | 1581 | debug2("channel %d: read %d from efd %d", |
184eed6a | 1582 | c->self, len, c->efd); |
ee55dacf | 1583 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
1584 | return 1; | |
1585 | if (len <= 0) { | |
1586 | debug2("channel %d: closing read-efd %d", | |
8ce64345 | 1587 | c->self, c->efd); |
489aa2e9 | 1588 | channel_close_fd(&c->efd); |
ee55dacf | 1589 | } else { |
7e7327a1 | 1590 | buffer_append(&c->extended, buf, len); |
ee55dacf | 1591 | } |
7e7327a1 | 1592 | } |
1593 | } | |
1594 | return 1; | |
1595 | } | |
a7137f6b | 1596 | |
396c147e | 1597 | static int |
c8e9c167 | 1598 | channel_handle_ctl(Channel *c, fd_set *readset, fd_set *writeset) |
5e96b616 | 1599 | { |
1600 | char buf[16]; | |
1601 | int len; | |
1602 | ||
1603 | /* Monitor control fd to detect if the slave client exits */ | |
1604 | if (c->ctl_fd != -1 && FD_ISSET(c->ctl_fd, readset)) { | |
1605 | len = read(c->ctl_fd, buf, sizeof(buf)); | |
1606 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) | |
1607 | return 1; | |
1608 | if (len <= 0) { | |
1609 | debug2("channel %d: ctl read<=0", c->self); | |
1610 | if (c->type != SSH_CHANNEL_OPEN) { | |
1611 | debug2("channel %d: not open", c->self); | |
1612 | chan_mark_dead(c); | |
1613 | return -1; | |
1614 | } else { | |
1615 | chan_read_failed(c); | |
1616 | chan_write_failed(c); | |
1617 | } | |
1618 | return -1; | |
1619 | } else | |
1620 | fatal("%s: unexpected data on ctl fd", __func__); | |
1621 | } | |
1622 | return 1; | |
1623 | } | |
a7137f6b | 1624 | |
5e96b616 | 1625 | static int |
ee55dacf | 1626 | channel_check_window(Channel *c) |
7e7327a1 | 1627 | { |
28b9cb4d | 1628 | if (c->type == SSH_CHANNEL_OPEN && |
1629 | !(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) && | |
7e7327a1 | 1630 | c->local_window < c->local_window_max/2 && |
1631 | c->local_consumed > 0) { | |
1632 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); | |
1633 | packet_put_int(c->remote_id); | |
1634 | packet_put_int(c->local_consumed); | |
1635 | packet_send(); | |
de273eef | 1636 | debug2("channel %d: window %d sent adjust %d", |
7e7327a1 | 1637 | c->self, c->local_window, |
1638 | c->local_consumed); | |
1639 | c->local_window += c->local_consumed; | |
1640 | c->local_consumed = 0; | |
7368a6c8 | 1641 | } |
1642 | return 1; | |
1643 | } | |
5260325f | 1644 | |
396c147e | 1645 | static void |
c8e9c167 | 1646 | channel_post_open(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1647 | { |
639cb8ab | 1648 | if (c->delayed) |
1649 | return; | |
7368a6c8 | 1650 | channel_handle_rfd(c, readset, writeset); |
1651 | channel_handle_wfd(c, readset, writeset); | |
0c0738d5 | 1652 | if (!compat20) |
639cb8ab | 1653 | return; |
7e7327a1 | 1654 | channel_handle_efd(c, readset, writeset); |
5e96b616 | 1655 | channel_handle_ctl(c, readset, writeset); |
ee55dacf | 1656 | channel_check_window(c); |
7e7327a1 | 1657 | } |
1658 | ||
396c147e | 1659 | static void |
c8e9c167 | 1660 | channel_post_output_drain_13(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1661 | { |
1662 | int len; | |
e1feb9bf | 1663 | |
7368a6c8 | 1664 | /* Send buffered output data to the socket. */ |
1665 | if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) { | |
1666 | len = write(c->sock, buffer_ptr(&c->output), | |
1667 | buffer_len(&c->output)); | |
1668 | if (len <= 0) | |
9c50edcf | 1669 | buffer_clear(&c->output); |
7368a6c8 | 1670 | else |
1671 | buffer_consume(&c->output, len); | |
1672 | } | |
1673 | } | |
5260325f | 1674 | |
396c147e | 1675 | static void |
7e7327a1 | 1676 | channel_handler_init_20(void) |
1677 | { | |
0c0738d5 | 1678 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open; |
0b242b12 | 1679 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
7e7327a1 | 1680 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; |
fa08c86b | 1681 | channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener; |
0b242b12 | 1682 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
fa08c86b | 1683 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; |
97fb6912 | 1684 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1685 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7e7327a1 | 1686 | |
0c0738d5 | 1687 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
7e7327a1 | 1688 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; |
fa08c86b | 1689 | channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener; |
0b242b12 | 1690 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
fa08c86b | 1691 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; |
97fb6912 | 1692 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 1693 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
7e7327a1 | 1694 | } |
1695 | ||
396c147e | 1696 | static void |
7368a6c8 | 1697 | channel_handler_init_13(void) |
1698 | { | |
1699 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13; | |
1700 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_13; | |
1701 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; | |
1702 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; | |
1703 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; | |
1704 | channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining; | |
1705 | channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining; | |
97fb6912 | 1706 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1707 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7368a6c8 | 1708 | |
0c0738d5 | 1709 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
7368a6c8 | 1710 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
1711 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; | |
1712 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; | |
1713 | channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13; | |
97fb6912 | 1714 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 1715 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
7368a6c8 | 1716 | } |
5260325f | 1717 | |
396c147e | 1718 | static void |
7368a6c8 | 1719 | channel_handler_init_15(void) |
1720 | { | |
0c0738d5 | 1721 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open; |
0b242b12 | 1722 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
7368a6c8 | 1723 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
1724 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; | |
1725 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; | |
97fb6912 | 1726 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1727 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7368a6c8 | 1728 | |
1729 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; | |
1730 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; | |
1731 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; | |
0c0738d5 | 1732 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
97fb6912 | 1733 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 1734 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
7368a6c8 | 1735 | } |
1736 | ||
396c147e | 1737 | static void |
7368a6c8 | 1738 | channel_handler_init(void) |
1739 | { | |
1740 | int i; | |
e1feb9bf | 1741 | |
184eed6a | 1742 | for (i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) { |
7368a6c8 | 1743 | channel_pre[i] = NULL; |
1744 | channel_post[i] = NULL; | |
1745 | } | |
7e7327a1 | 1746 | if (compat20) |
1747 | channel_handler_init_20(); | |
1748 | else if (compat13) | |
7368a6c8 | 1749 | channel_handler_init_13(); |
1750 | else | |
1751 | channel_handler_init_15(); | |
1752 | } | |
1753 | ||
418e724c | 1754 | /* gc dead channels */ |
1755 | static void | |
1756 | channel_garbage_collect(Channel *c) | |
1757 | { | |
1758 | if (c == NULL) | |
1759 | return; | |
1760 | if (c->detach_user != NULL) { | |
8cd0437d | 1761 | if (!chan_is_dead(c, c->detach_close)) |
418e724c | 1762 | return; |
d7ac5f18 | 1763 | debug2("channel %d: gc: notify user", c->self); |
418e724c | 1764 | c->detach_user(c->self, NULL); |
1765 | /* if we still have a callback */ | |
1766 | if (c->detach_user != NULL) | |
1767 | return; | |
d7ac5f18 | 1768 | debug2("channel %d: gc: user detached", c->self); |
418e724c | 1769 | } |
1770 | if (!chan_is_dead(c, 1)) | |
1771 | return; | |
d7ac5f18 | 1772 | debug2("channel %d: garbage collecting", c->self); |
418e724c | 1773 | channel_free(c); |
1774 | } | |
1775 | ||
396c147e | 1776 | static void |
c8e9c167 | 1777 | channel_handler(chan_fn *ftab[], fd_set *readset, fd_set *writeset) |
7368a6c8 | 1778 | { |
1779 | static int did_init = 0; | |
9a995072 | 1780 | u_int i; |
7368a6c8 | 1781 | Channel *c; |
1782 | ||
1783 | if (!did_init) { | |
1784 | channel_handler_init(); | |
1785 | did_init = 1; | |
1786 | } | |
1787 | for (i = 0; i < channels_alloc; i++) { | |
719fc62f | 1788 | c = channels[i]; |
1789 | if (c == NULL) | |
5260325f | 1790 | continue; |
6fd8622b | 1791 | if (ftab[c->type] != NULL) |
1792 | (*ftab[c->type])(c, readset, writeset); | |
418e724c | 1793 | channel_garbage_collect(c); |
8efc0c15 | 1794 | } |
8efc0c15 | 1795 | } |
1796 | ||
8e7895b8 | 1797 | /* |
1798 | * Allocate/update select bitmasks and add any bits relevant to channels in | |
1799 | * select bitmasks. | |
1800 | */ | |
6ae2364d | 1801 | void |
c422989b | 1802 | channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp, |
9a995072 | 1803 | u_int *nallocp, int rekeying) |
7368a6c8 | 1804 | { |
c5d10563 | 1805 | u_int n, sz, nfdset; |
39929cdb | 1806 | |
1807 | n = MAX(*maxfdp, channel_max_fd); | |
1808 | ||
c5d10563 | 1809 | nfdset = howmany(n+1, NFDBITS); |
1810 | /* Explicitly test here, because xrealloc isn't always called */ | |
1811 | if (nfdset && SIZE_T_MAX / nfdset < sizeof(fd_mask)) | |
1812 | fatal("channel_prepare_select: max_fd (%d) is too large", n); | |
1813 | sz = nfdset * sizeof(fd_mask); | |
1814 | ||
489aa2e9 | 1815 | /* perhaps check sz < nalloc/2 and shrink? */ |
1816 | if (*readsetp == NULL || sz > *nallocp) { | |
c5d10563 | 1817 | *readsetp = xrealloc(*readsetp, nfdset, sizeof(fd_mask)); |
1818 | *writesetp = xrealloc(*writesetp, nfdset, sizeof(fd_mask)); | |
489aa2e9 | 1819 | *nallocp = sz; |
39929cdb | 1820 | } |
489aa2e9 | 1821 | *maxfdp = n; |
39929cdb | 1822 | memset(*readsetp, 0, sz); |
1823 | memset(*writesetp, 0, sz); | |
1824 | ||
c422989b | 1825 | if (!rekeying) |
1826 | channel_handler(channel_pre, *readsetp, *writesetp); | |
7368a6c8 | 1827 | } |
1828 | ||
8e7895b8 | 1829 | /* |
1830 | * After select, perform any appropriate operations for channels which have | |
1831 | * events pending. | |
1832 | */ | |
6ae2364d | 1833 | void |
c8e9c167 | 1834 | channel_after_select(fd_set *readset, fd_set *writeset) |
7368a6c8 | 1835 | { |
1836 | channel_handler(channel_post, readset, writeset); | |
1837 | } | |
1838 | ||
8e7895b8 | 1839 | |
39929cdb | 1840 | /* If there is data to send to the connection, enqueue some of it now. */ |
6ae2364d | 1841 | void |
d5bb9418 | 1842 | channel_output_poll(void) |
8efc0c15 | 1843 | { |
7368a6c8 | 1844 | Channel *c; |
9a995072 | 1845 | u_int i, len; |
5260325f | 1846 | |
1847 | for (i = 0; i < channels_alloc; i++) { | |
719fc62f | 1848 | c = channels[i]; |
1849 | if (c == NULL) | |
1850 | continue; | |
48e671d5 | 1851 | |
8e7895b8 | 1852 | /* |
1853 | * We are only interested in channels that can have buffered | |
1854 | * incoming data. | |
1855 | */ | |
48e671d5 | 1856 | if (compat13) { |
7368a6c8 | 1857 | if (c->type != SSH_CHANNEL_OPEN && |
1858 | c->type != SSH_CHANNEL_INPUT_DRAINING) | |
48e671d5 | 1859 | continue; |
1860 | } else { | |
7368a6c8 | 1861 | if (c->type != SSH_CHANNEL_OPEN) |
48e671d5 | 1862 | continue; |
48e671d5 | 1863 | } |
e78a59f5 | 1864 | if (compat20 && |
1865 | (c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) { | |
ee55dacf | 1866 | /* XXX is this true? */ |
418e724c | 1867 | debug3("channel %d: will not send data after close", c->self); |
7e7327a1 | 1868 | continue; |
1869 | } | |
5260325f | 1870 | |
1871 | /* Get the amount of buffered data for this channel. */ | |
ee55dacf | 1872 | if ((c->istate == CHAN_INPUT_OPEN || |
1873 | c->istate == CHAN_INPUT_WAIT_DRAIN) && | |
1874 | (len = buffer_len(&c->input)) > 0) { | |
d20f3c9e | 1875 | if (c->datagram) { |
1876 | if (len > 0) { | |
1877 | u_char *data; | |
1878 | u_int dlen; | |
1879 | ||
1880 | data = buffer_get_string(&c->input, | |
1881 | &dlen); | |
1882 | packet_start(SSH2_MSG_CHANNEL_DATA); | |
1883 | packet_put_int(c->remote_id); | |
1884 | packet_put_string(data, dlen); | |
1885 | packet_send(); | |
1886 | c->remote_window -= dlen + 4; | |
1887 | xfree(data); | |
1888 | } | |
1889 | continue; | |
1890 | } | |
8e7895b8 | 1891 | /* |
1892 | * Send some data for the other side over the secure | |
1893 | * connection. | |
1894 | */ | |
7e7327a1 | 1895 | if (compat20) { |
1896 | if (len > c->remote_window) | |
1897 | len = c->remote_window; | |
1898 | if (len > c->remote_maxpacket) | |
1899 | len = c->remote_maxpacket; | |
5260325f | 1900 | } else { |
7e7327a1 | 1901 | if (packet_is_interactive()) { |
1902 | if (len > 1024) | |
1903 | len = 512; | |
1904 | } else { | |
1905 | /* Keep the packets at reasonable size. */ | |
1906 | if (len > packet_get_maxsize()/2) | |
1907 | len = packet_get_maxsize()/2; | |
1908 | } | |
5260325f | 1909 | } |
7368a6c8 | 1910 | if (len > 0) { |
7e7327a1 | 1911 | packet_start(compat20 ? |
1912 | SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA); | |
7368a6c8 | 1913 | packet_put_int(c->remote_id); |
1914 | packet_put_string(buffer_ptr(&c->input), len); | |
1915 | packet_send(); | |
1916 | buffer_consume(&c->input, len); | |
1917 | c->remote_window -= len; | |
7368a6c8 | 1918 | } |
1919 | } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) { | |
5260325f | 1920 | if (compat13) |
1921 | fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3"); | |
aa3378df | 1922 | /* |
1923 | * input-buffer is empty and read-socket shutdown: | |
d2296ed7 | 1924 | * tell peer, that we will not send more data: send IEOF. |
1925 | * hack for extended data: delay EOF if EFD still in use. | |
aa3378df | 1926 | */ |
d2296ed7 | 1927 | if (CHANNEL_EFD_INPUT_ACTIVE(c)) |
4e2e5cfd | 1928 | debug2("channel %d: ibuf_empty delayed efd %d/(%d)", |
1929 | c->self, c->efd, buffer_len(&c->extended)); | |
d2296ed7 | 1930 | else |
1931 | chan_ibuf_empty(c); | |
5260325f | 1932 | } |
7e7327a1 | 1933 | /* Send extended data, i.e. stderr */ |
1934 | if (compat20 && | |
d2296ed7 | 1935 | !(c->flags & CHAN_EOF_SENT) && |
7e7327a1 | 1936 | c->remote_window > 0 && |
1937 | (len = buffer_len(&c->extended)) > 0 && | |
1938 | c->extended_usage == CHAN_EXTENDED_READ) { | |
f91d9a89 | 1939 | debug2("channel %d: rwin %u elen %u euse %d", |
ee55dacf | 1940 | c->self, c->remote_window, buffer_len(&c->extended), |
1941 | c->extended_usage); | |
7e7327a1 | 1942 | if (len > c->remote_window) |
1943 | len = c->remote_window; | |
1944 | if (len > c->remote_maxpacket) | |
1945 | len = c->remote_maxpacket; | |
1946 | packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA); | |
1947 | packet_put_int(c->remote_id); | |
1948 | packet_put_int(SSH2_EXTENDED_DATA_STDERR); | |
1949 | packet_put_string(buffer_ptr(&c->extended), len); | |
1950 | packet_send(); | |
1951 | buffer_consume(&c->extended, len); | |
1952 | c->remote_window -= len; | |
ee55dacf | 1953 | debug2("channel %d: sent ext data %d", c->self, len); |
7e7327a1 | 1954 | } |
8efc0c15 | 1955 | } |
8efc0c15 | 1956 | } |
1957 | ||
8e7895b8 | 1958 | |
1959 | /* -- protocol input */ | |
04aa9e67 | 1960 | |
1961 | /* ARGSUSED */ | |
6ae2364d | 1962 | void |
7819b5c3 | 1963 | channel_input_data(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 1964 | { |
48e671d5 | 1965 | int id; |
5260325f | 1966 | char *data; |
1e3b8b07 | 1967 | u_int data_len; |
7368a6c8 | 1968 | Channel *c; |
5260325f | 1969 | |
1970 | /* Get the channel number and verify it. */ | |
48e671d5 | 1971 | id = packet_get_int(); |
7368a6c8 | 1972 | c = channel_lookup(id); |
1973 | if (c == NULL) | |
48e671d5 | 1974 | packet_disconnect("Received data for nonexistent channel %d.", id); |
5260325f | 1975 | |
1976 | /* Ignore any data for non-open channels (might happen on close) */ | |
7368a6c8 | 1977 | if (c->type != SSH_CHANNEL_OPEN && |
1978 | c->type != SSH_CHANNEL_X11_OPEN) | |
48e671d5 | 1979 | return; |
1980 | ||
5260325f | 1981 | /* Get the data. */ |
1982 | data = packet_get_string(&data_len); | |
7368a6c8 | 1983 | |
7741e239 | 1984 | /* |
1985 | * Ignore data for protocol > 1.3 if output end is no longer open. | |
1986 | * For protocol 2 the sending side is reducing its window as it sends | |
1987 | * data, so we must 'fake' consumption of the data in order to ensure | |
1988 | * that window updates are sent back. Otherwise the connection might | |
1989 | * deadlock. | |
1990 | */ | |
1991 | if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN) { | |
1992 | if (compat20) { | |
1993 | c->local_window -= data_len; | |
1994 | c->local_consumed += data_len; | |
1995 | } | |
1996 | xfree(data); | |
1997 | return; | |
1998 | } | |
1999 | ||
6aacefa7 | 2000 | if (compat20) { |
7e7327a1 | 2001 | if (data_len > c->local_maxpacket) { |
bbe88b6d | 2002 | logit("channel %d: rcvd big packet %d, maxpack %d", |
7e7327a1 | 2003 | c->self, data_len, c->local_maxpacket); |
2004 | } | |
2005 | if (data_len > c->local_window) { | |
bbe88b6d | 2006 | logit("channel %d: rcvd too much data %d, win %d", |
7e7327a1 | 2007 | c->self, data_len, c->local_window); |
2008 | xfree(data); | |
2009 | return; | |
2010 | } | |
2011 | c->local_window -= data_len; | |
7e7327a1 | 2012 | } |
95500969 | 2013 | packet_check_eom(); |
d20f3c9e | 2014 | if (c->datagram) |
2015 | buffer_put_string(&c->output, data, data_len); | |
2016 | else | |
2017 | buffer_append(&c->output, data, data_len); | |
5260325f | 2018 | xfree(data); |
8efc0c15 | 2019 | } |
8e7895b8 | 2020 | |
04aa9e67 | 2021 | /* ARGSUSED */ |
6ae2364d | 2022 | void |
7819b5c3 | 2023 | channel_input_extended_data(int type, u_int32_t seq, void *ctxt) |
7e7327a1 | 2024 | { |
2025 | int id; | |
7e7327a1 | 2026 | char *data; |
a594fa74 | 2027 | u_int data_len, tcode; |
7e7327a1 | 2028 | Channel *c; |
2029 | ||
2030 | /* Get the channel number and verify it. */ | |
2031 | id = packet_get_int(); | |
2032 | c = channel_lookup(id); | |
2033 | ||
2034 | if (c == NULL) | |
2035 | packet_disconnect("Received extended_data for bad channel %d.", id); | |
2036 | if (c->type != SSH_CHANNEL_OPEN) { | |
bbe88b6d | 2037 | logit("channel %d: ext data for non open", id); |
7e7327a1 | 2038 | return; |
2039 | } | |
d2296ed7 | 2040 | if (c->flags & CHAN_EOF_RCVD) { |
2041 | if (datafellows & SSH_BUG_EXTEOF) | |
2042 | debug("channel %d: accepting ext data after eof", id); | |
2043 | else | |
2044 | packet_disconnect("Received extended_data after EOF " | |
2045 | "on channel %d.", id); | |
2046 | } | |
7e7327a1 | 2047 | tcode = packet_get_int(); |
2048 | if (c->efd == -1 || | |
2049 | c->extended_usage != CHAN_EXTENDED_WRITE || | |
2050 | tcode != SSH2_EXTENDED_DATA_STDERR) { | |
bbe88b6d | 2051 | logit("channel %d: bad ext data", c->self); |
7e7327a1 | 2052 | return; |
2053 | } | |
2054 | data = packet_get_string(&data_len); | |
95500969 | 2055 | packet_check_eom(); |
7e7327a1 | 2056 | if (data_len > c->local_window) { |
bbe88b6d | 2057 | logit("channel %d: rcvd too much extended_data %d, win %d", |
7e7327a1 | 2058 | c->self, data_len, c->local_window); |
2059 | xfree(data); | |
2060 | return; | |
2061 | } | |
de273eef | 2062 | debug2("channel %d: rcvd ext data %d", c->self, data_len); |
7e7327a1 | 2063 | c->local_window -= data_len; |
2064 | buffer_append(&c->extended, data, data_len); | |
2065 | xfree(data); | |
2066 | } | |
2067 | ||
04aa9e67 | 2068 | /* ARGSUSED */ |
6ae2364d | 2069 | void |
7819b5c3 | 2070 | channel_input_ieof(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 2071 | { |
2072 | int id; | |
2073 | Channel *c; | |
2074 | ||
7368a6c8 | 2075 | id = packet_get_int(); |
95500969 | 2076 | packet_check_eom(); |
7368a6c8 | 2077 | c = channel_lookup(id); |
2078 | if (c == NULL) | |
2079 | packet_disconnect("Received ieof for nonexistent channel %d.", id); | |
2080 | chan_rcvd_ieof(c); | |
a5f82435 | 2081 | |
2082 | /* XXX force input close */ | |
8341f420 | 2083 | if (c->force_drain && c->istate == CHAN_INPUT_OPEN) { |
a5f82435 | 2084 | debug("channel %d: FORCE input drain", c->self); |
2085 | c->istate = CHAN_INPUT_WAIT_DRAIN; | |
32e7d71f | 2086 | if (buffer_len(&c->input) == 0) |
2087 | chan_ibuf_empty(c); | |
a5f82435 | 2088 | } |
2089 | ||
7368a6c8 | 2090 | } |
8efc0c15 | 2091 | |
04aa9e67 | 2092 | /* ARGSUSED */ |
6ae2364d | 2093 | void |
7819b5c3 | 2094 | channel_input_close(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2095 | { |
7368a6c8 | 2096 | int id; |
2097 | Channel *c; | |
5260325f | 2098 | |
7368a6c8 | 2099 | id = packet_get_int(); |
95500969 | 2100 | packet_check_eom(); |
7368a6c8 | 2101 | c = channel_lookup(id); |
2102 | if (c == NULL) | |
2103 | packet_disconnect("Received close for nonexistent channel %d.", id); | |
aa3378df | 2104 | |
2105 | /* | |
2106 | * Send a confirmation that we have closed the channel and no more | |
2107 | * data is coming for it. | |
2108 | */ | |
5260325f | 2109 | packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION); |
7368a6c8 | 2110 | packet_put_int(c->remote_id); |
5260325f | 2111 | packet_send(); |
2112 | ||
aa3378df | 2113 | /* |
2114 | * If the channel is in closed state, we have sent a close request, | |
2115 | * and the other side will eventually respond with a confirmation. | |
2116 | * Thus, we cannot free the channel here, because then there would be | |
2117 | * no-one to receive the confirmation. The channel gets freed when | |
2118 | * the confirmation arrives. | |
2119 | */ | |
7368a6c8 | 2120 | if (c->type != SSH_CHANNEL_CLOSED) { |
aa3378df | 2121 | /* |
2122 | * Not a closed channel - mark it as draining, which will | |
2123 | * cause it to be freed later. | |
2124 | */ | |
9c50edcf | 2125 | buffer_clear(&c->input); |
7368a6c8 | 2126 | c->type = SSH_CHANNEL_OUTPUT_DRAINING; |
5260325f | 2127 | } |
8efc0c15 | 2128 | } |
2129 | ||
7368a6c8 | 2130 | /* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */ |
04aa9e67 | 2131 | /* ARGSUSED */ |
6ae2364d | 2132 | void |
7819b5c3 | 2133 | channel_input_oclose(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2134 | { |
7368a6c8 | 2135 | int id = packet_get_int(); |
2136 | Channel *c = channel_lookup(id); | |
a8a21a53 | 2137 | |
95500969 | 2138 | packet_check_eom(); |
7368a6c8 | 2139 | if (c == NULL) |
2140 | packet_disconnect("Received oclose for nonexistent channel %d.", id); | |
2141 | chan_rcvd_oclose(c); | |
8efc0c15 | 2142 | } |
2143 | ||
04aa9e67 | 2144 | /* ARGSUSED */ |
6ae2364d | 2145 | void |
7819b5c3 | 2146 | channel_input_close_confirmation(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 2147 | { |
2148 | int id = packet_get_int(); | |
2149 | Channel *c = channel_lookup(id); | |
2150 | ||
95500969 | 2151 | packet_check_eom(); |
7368a6c8 | 2152 | if (c == NULL) |
2153 | packet_disconnect("Received close confirmation for " | |
2154 | "out-of-range channel %d.", id); | |
2155 | if (c->type != SSH_CHANNEL_CLOSED) | |
2156 | packet_disconnect("Received close confirmation for " | |
2157 | "non-closed channel %d (type %d).", id, c->type); | |
719fc62f | 2158 | channel_free(c); |
7368a6c8 | 2159 | } |
8efc0c15 | 2160 | |
04aa9e67 | 2161 | /* ARGSUSED */ |
6ae2364d | 2162 | void |
7819b5c3 | 2163 | channel_input_open_confirmation(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2164 | { |
7368a6c8 | 2165 | int id, remote_id; |
2166 | Channel *c; | |
5260325f | 2167 | |
7368a6c8 | 2168 | id = packet_get_int(); |
2169 | c = channel_lookup(id); | |
5260325f | 2170 | |
7368a6c8 | 2171 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) |
2172 | packet_disconnect("Received open confirmation for " | |
2173 | "non-opening channel %d.", id); | |
2174 | remote_id = packet_get_int(); | |
aa3378df | 2175 | /* Record the remote channel number and mark that the channel is now open. */ |
7368a6c8 | 2176 | c->remote_id = remote_id; |
2177 | c->type = SSH_CHANNEL_OPEN; | |
7e7327a1 | 2178 | |
2179 | if (compat20) { | |
2180 | c->remote_window = packet_get_int(); | |
2181 | c->remote_maxpacket = packet_get_int(); | |
05ca0898 | 2182 | if (c->confirm) { |
de273eef | 2183 | debug2("callback start"); |
5e96b616 | 2184 | c->confirm(c->self, c->confirm_ctx); |
de273eef | 2185 | debug2("callback done"); |
7e7327a1 | 2186 | } |
d7ac5f18 | 2187 | debug2("channel %d: open confirm rwindow %u rmax %u", c->self, |
7e7327a1 | 2188 | c->remote_window, c->remote_maxpacket); |
2189 | } | |
95500969 | 2190 | packet_check_eom(); |
8efc0c15 | 2191 | } |
2192 | ||
396c147e | 2193 | static char * |
d18e0850 | 2194 | reason2txt(int reason) |
2195 | { | |
6aacefa7 | 2196 | switch (reason) { |
d18e0850 | 2197 | case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED: |
2198 | return "administratively prohibited"; | |
2199 | case SSH2_OPEN_CONNECT_FAILED: | |
2200 | return "connect failed"; | |
2201 | case SSH2_OPEN_UNKNOWN_CHANNEL_TYPE: | |
2202 | return "unknown channel type"; | |
2203 | case SSH2_OPEN_RESOURCE_SHORTAGE: | |
2204 | return "resource shortage"; | |
2205 | } | |
7e8c18e9 | 2206 | return "unknown reason"; |
d18e0850 | 2207 | } |
2208 | ||
04aa9e67 | 2209 | /* ARGSUSED */ |
6ae2364d | 2210 | void |
7819b5c3 | 2211 | channel_input_open_failure(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2212 | { |
02a024dd | 2213 | int id, reason; |
2214 | char *msg = NULL, *lang = NULL; | |
7368a6c8 | 2215 | Channel *c; |
5260325f | 2216 | |
7368a6c8 | 2217 | id = packet_get_int(); |
2218 | c = channel_lookup(id); | |
2219 | ||
2220 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) | |
2221 | packet_disconnect("Received open failure for " | |
2222 | "non-opening channel %d.", id); | |
7e7327a1 | 2223 | if (compat20) { |
02a024dd | 2224 | reason = packet_get_int(); |
fbe90f7b | 2225 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { |
02a024dd | 2226 | msg = packet_get_string(NULL); |
2227 | lang = packet_get_string(NULL); | |
2228 | } | |
bbe88b6d | 2229 | logit("channel %d: open failed: %s%s%s", id, |
d18e0850 | 2230 | reason2txt(reason), msg ? ": ": "", msg ? msg : ""); |
02a024dd | 2231 | if (msg != NULL) |
2232 | xfree(msg); | |
2233 | if (lang != NULL) | |
2234 | xfree(lang); | |
7e7327a1 | 2235 | } |
95500969 | 2236 | packet_check_eom(); |
5260325f | 2237 | /* Free the channel. This will also close the socket. */ |
719fc62f | 2238 | channel_free(c); |
8efc0c15 | 2239 | } |
2240 | ||
04aa9e67 | 2241 | /* ARGSUSED */ |
8e7895b8 | 2242 | void |
7819b5c3 | 2243 | channel_input_window_adjust(int type, u_int32_t seq, void *ctxt) |
8e7895b8 | 2244 | { |
2245 | Channel *c; | |
f91d9a89 | 2246 | int id; |
2247 | u_int adjust; | |
3ffc6336 | 2248 | |
8e7895b8 | 2249 | if (!compat20) |
2250 | return; | |
8efc0c15 | 2251 | |
8e7895b8 | 2252 | /* Get the channel number and verify it. */ |
2253 | id = packet_get_int(); | |
2254 | c = channel_lookup(id); | |
2255 | ||
b872f7f0 | 2256 | if (c == NULL) { |
2257 | logit("Received window adjust for non-open channel %d.", id); | |
8e7895b8 | 2258 | return; |
2259 | } | |
2260 | adjust = packet_get_int(); | |
95500969 | 2261 | packet_check_eom(); |
f91d9a89 | 2262 | debug2("channel %d: rcvd adjust %u", id, adjust); |
8e7895b8 | 2263 | c->remote_window += adjust; |
2264 | } | |
2265 | ||
04aa9e67 | 2266 | /* ARGSUSED */ |
8e7895b8 | 2267 | void |
7819b5c3 | 2268 | channel_input_port_open(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2269 | { |
8e7895b8 | 2270 | Channel *c = NULL; |
2271 | u_short host_port; | |
2272 | char *host, *originator_string; | |
2273 | int remote_id, sock = -1; | |
5260325f | 2274 | |
8e7895b8 | 2275 | remote_id = packet_get_int(); |
2276 | host = packet_get_string(NULL); | |
2277 | host_port = packet_get_int(); | |
2278 | ||
2279 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) { | |
2280 | originator_string = packet_get_string(NULL); | |
2281 | } else { | |
2282 | originator_string = xstrdup("unknown (remote did not supply name)"); | |
2283 | } | |
95500969 | 2284 | packet_check_eom(); |
8e7895b8 | 2285 | sock = channel_connect_to(host, host_port); |
2286 | if (sock != -1) { | |
2287 | c = channel_new("connected socket", | |
2288 | SSH_CHANNEL_CONNECTING, sock, sock, -1, 0, 0, 0, | |
2289 | originator_string, 1); | |
3a0d3d54 | 2290 | c->remote_id = remote_id; |
5260325f | 2291 | } |
0d942eff | 2292 | xfree(originator_string); |
8e7895b8 | 2293 | if (c == NULL) { |
2294 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
2295 | packet_put_int(remote_id); | |
2296 | packet_send(); | |
2297 | } | |
2298 | xfree(host); | |
8efc0c15 | 2299 | } |
2300 | ||
8e7895b8 | 2301 | |
2302 | /* -- tcp forwarding */ | |
2303 | ||
5e4a7219 | 2304 | void |
2305 | channel_set_af(int af) | |
2306 | { | |
2307 | IPv4or6 = af; | |
2308 | } | |
2309 | ||
5641aefa | 2310 | static int |
2311 | channel_setup_fwd_listener(int type, const char *listen_addr, u_short listen_port, | |
2312 | const char *host_to_connect, u_short port_to_connect, int gateway_ports) | |
8efc0c15 | 2313 | { |
719fc62f | 2314 | Channel *c; |
442aee3a | 2315 | int sock, r, success = 0, wildcard = 0, is_client; |
48e671d5 | 2316 | struct addrinfo hints, *ai, *aitop; |
3867aa0a | 2317 | const char *host, *addr; |
5641aefa | 2318 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
5260325f | 2319 | |
5641aefa | 2320 | host = (type == SSH_CHANNEL_RPORT_LISTENER) ? |
2321 | listen_addr : host_to_connect; | |
3867aa0a | 2322 | is_client = (type == SSH_CHANNEL_PORT_LISTENER); |
02a024dd | 2323 | |
5641aefa | 2324 | if (host == NULL) { |
2325 | error("No forward host name."); | |
38946c65 | 2326 | return 0; |
fa08c86b | 2327 | } |
719fc62f | 2328 | if (strlen(host) > SSH_CHANNEL_PATH_LEN - 1) { |
02a024dd | 2329 | error("Forward host name too long."); |
38946c65 | 2330 | return 0; |
02a024dd | 2331 | } |
5260325f | 2332 | |
3867aa0a | 2333 | /* |
2334 | * Determine whether or not a port forward listens to loopback, | |
f8cc7664 | 2335 | * specified address or wildcard. On the client, a specified bind |
2336 | * address will always override gateway_ports. On the server, a | |
2337 | * gateway_ports of 1 (``yes'') will override the client's | |
2338 | * specification and force a wildcard bind, whereas a value of 2 | |
2339 | * (``clientspecified'') will bind to whatever address the client | |
3867aa0a | 2340 | * asked for. |
2341 | * | |
2342 | * Special-case listen_addrs are: | |
2343 | * | |
2344 | * "0.0.0.0" -> wildcard v4/v6 if SSH_OLD_FORWARD_ADDR | |
2345 | * "" (empty string), "*" -> wildcard v4/v6 | |
2346 | * "localhost" -> loopback v4/v6 | |
2347 | */ | |
2348 | addr = NULL; | |
2349 | if (listen_addr == NULL) { | |
2350 | /* No address specified: default to gateway_ports setting */ | |
2351 | if (gateway_ports) | |
2352 | wildcard = 1; | |
2353 | } else if (gateway_ports || is_client) { | |
2354 | if (((datafellows & SSH_OLD_FORWARD_ADDR) && | |
2355 | strcmp(listen_addr, "0.0.0.0") == 0) || | |
2356 | *listen_addr == '\0' || strcmp(listen_addr, "*") == 0 || | |
2357 | (!is_client && gateway_ports == 1)) | |
2358 | wildcard = 1; | |
2359 | else if (strcmp(listen_addr, "localhost") != 0) | |
2360 | addr = listen_addr; | |
2361 | } | |
2362 | ||
2363 | debug3("channel_setup_fwd_listener: type %d wildcard %d addr %s", | |
2364 | type, wildcard, (addr == NULL) ? "NULL" : addr); | |
2365 | ||
aa3378df | 2366 | /* |
48e671d5 | 2367 | * getaddrinfo returns a loopback address if the hostname is |
2368 | * set to NULL and hints.ai_flags is not AI_PASSIVE | |
aa3378df | 2369 | */ |
48e671d5 | 2370 | memset(&hints, 0, sizeof(hints)); |
2371 | hints.ai_family = IPv4or6; | |
3867aa0a | 2372 | hints.ai_flags = wildcard ? AI_PASSIVE : 0; |
48e671d5 | 2373 | hints.ai_socktype = SOCK_STREAM; |
fa08c86b | 2374 | snprintf(strport, sizeof strport, "%d", listen_port); |
3867aa0a | 2375 | if ((r = getaddrinfo(addr, strport, &hints, &aitop)) != 0) { |
2376 | if (addr == NULL) { | |
2377 | /* This really shouldn't happen */ | |
2378 | packet_disconnect("getaddrinfo: fatal error: %s", | |
2379 | gai_strerror(r)); | |
2380 | } else { | |
38946c65 | 2381 | error("channel_setup_fwd_listener: " |
3867aa0a | 2382 | "getaddrinfo(%.64s): %s", addr, gai_strerror(r)); |
2383 | } | |
38946c65 | 2384 | return 0; |
3867aa0a | 2385 | } |
48e671d5 | 2386 | |
48e671d5 | 2387 | for (ai = aitop; ai; ai = ai->ai_next) { |
2388 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
2389 | continue; | |
2390 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), | |
2391 | strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { | |
5641aefa | 2392 | error("channel_setup_fwd_listener: getnameinfo failed"); |
48e671d5 | 2393 | continue; |
2394 | } | |
2395 | /* Create a port to listen for the host. */ | |
3e131a6d | 2396 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
48e671d5 | 2397 | if (sock < 0) { |
2398 | /* this is no error since kernel may not support ipv6 */ | |
2399 | verbose("socket: %.100s", strerror(errno)); | |
2400 | continue; | |
2401 | } | |
442aee3a | 2402 | |
2403 | channel_set_reuseaddr(sock); | |
facfd613 | 2404 | |
48e671d5 | 2405 | debug("Local forwarding listening on %s port %s.", ntop, strport); |
2406 | ||
2407 | /* Bind the socket to the address. */ | |
2408 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { | |
2409 | /* address can be in use ipv6 address is already bound */ | |
16218745 | 2410 | if (!ai->ai_next) |
2411 | error("bind: %.100s", strerror(errno)); | |
2412 | else | |
2413 | verbose("bind: %.100s", strerror(errno)); | |
2b87da3b | 2414 | |
48e671d5 | 2415 | close(sock); |
2416 | continue; | |
2417 | } | |
2418 | /* Start listening for connections on the socket. */ | |
fce39749 | 2419 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { |
48e671d5 | 2420 | error("listen: %.100s", strerror(errno)); |
2421 | close(sock); | |
2422 | continue; | |
2423 | } | |
2424 | /* Allocate a channel number for the socket. */ | |
8e7895b8 | 2425 | c = channel_new("port listener", type, sock, sock, -1, |
0b242b12 | 2426 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, |
0d942eff | 2427 | 0, "port listener", 1); |
719fc62f | 2428 | strlcpy(c->path, host, sizeof(c->path)); |
2429 | c->host_port = port_to_connect; | |
2430 | c->listening_port = listen_port; | |
48e671d5 | 2431 | success = 1; |
2432 | } | |
2433 | if (success == 0) | |
5641aefa | 2434 | error("channel_setup_fwd_listener: cannot listen to port: %d", |
02a024dd | 2435 | listen_port); |
48e671d5 | 2436 | freeaddrinfo(aitop); |
02a024dd | 2437 | return success; |
5260325f | 2438 | } |
8efc0c15 | 2439 | |
d740ec16 | 2440 | int |
2441 | channel_cancel_rport_listener(const char *host, u_short port) | |
2442 | { | |
9a995072 | 2443 | u_int i; |
2444 | int found = 0; | |
d740ec16 | 2445 | |
f8cc7664 | 2446 | for (i = 0; i < channels_alloc; i++) { |
d740ec16 | 2447 | Channel *c = channels[i]; |
2448 | ||
2449 | if (c != NULL && c->type == SSH_CHANNEL_RPORT_LISTENER && | |
2450 | strncmp(c->path, host, sizeof(c->path)) == 0 && | |
f2107e97 | 2451 | c->listening_port == port) { |
2912cbd6 | 2452 | debug2("%s: close channel %d", __func__, i); |
d740ec16 | 2453 | channel_free(c); |
2454 | found = 1; | |
2455 | } | |
2456 | } | |
2457 | ||
2458 | return (found); | |
2459 | } | |
2460 | ||
5641aefa | 2461 | /* protocol local port fwd, used by ssh (and sshd in v1) */ |
2462 | int | |
3867aa0a | 2463 | channel_setup_local_fwd_listener(const char *listen_host, u_short listen_port, |
5641aefa | 2464 | const char *host_to_connect, u_short port_to_connect, int gateway_ports) |
2465 | { | |
2466 | return channel_setup_fwd_listener(SSH_CHANNEL_PORT_LISTENER, | |
3867aa0a | 2467 | listen_host, listen_port, host_to_connect, port_to_connect, |
2468 | gateway_ports); | |
5641aefa | 2469 | } |
2470 | ||
2471 | /* protocol v2 remote port fwd, used by sshd */ | |
2472 | int | |
2473 | channel_setup_remote_fwd_listener(const char *listen_address, | |
2474 | u_short listen_port, int gateway_ports) | |
2475 | { | |
2476 | return channel_setup_fwd_listener(SSH_CHANNEL_RPORT_LISTENER, | |
2477 | listen_address, listen_port, NULL, 0, gateway_ports); | |
2478 | } | |
2479 | ||
aa3378df | 2480 | /* |
2481 | * Initiate forwarding of connections to port "port" on remote host through | |
2482 | * the secure channel to host:port from local side. | |
2483 | */ | |
8efc0c15 | 2484 | |
42ea6f5e | 2485 | int |
3867aa0a | 2486 | channel_request_remote_forwarding(const char *listen_host, u_short listen_port, |
fa08c86b | 2487 | const char *host_to_connect, u_short port_to_connect) |
8efc0c15 | 2488 | { |
54a5250f | 2489 | int type, success = 0; |
fa08c86b | 2490 | |
5260325f | 2491 | /* Record locally that connection to this host/port is permitted. */ |
2492 | if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
2493 | fatal("channel_request_remote_forwarding: too many forwards"); | |
2494 | ||
5260325f | 2495 | /* Send the forward request to the remote side. */ |
7e7327a1 | 2496 | if (compat20) { |
3867aa0a | 2497 | const char *address_to_bind; |
2498 | if (listen_host == NULL) | |
2499 | address_to_bind = "localhost"; | |
2500 | else if (*listen_host == '\0' || strcmp(listen_host, "*") == 0) | |
2501 | address_to_bind = ""; | |
2502 | else | |
2503 | address_to_bind = listen_host; | |
2504 | ||
7e7327a1 | 2505 | packet_start(SSH2_MSG_GLOBAL_REQUEST); |
2506 | packet_put_cstring("tcpip-forward"); | |
e0ae8728 | 2507 | packet_put_char(1); /* boolean: want reply */ |
7e7327a1 | 2508 | packet_put_cstring(address_to_bind); |
2509 | packet_put_int(listen_port); | |
fa08c86b | 2510 | packet_send(); |
2511 | packet_write_wait(); | |
2512 | /* Assume that server accepts the request */ | |
2513 | success = 1; | |
7e7327a1 | 2514 | } else { |
2515 | packet_start(SSH_CMSG_PORT_FORWARD_REQUEST); | |
7e7327a1 | 2516 | packet_put_int(listen_port); |
d6f24e45 | 2517 | packet_put_cstring(host_to_connect); |
2518 | packet_put_int(port_to_connect); | |
7e7327a1 | 2519 | packet_send(); |
2520 | packet_write_wait(); | |
fa08c86b | 2521 | |
2522 | /* Wait for response from the remote side. */ | |
54a5250f | 2523 | type = packet_read(); |
fa08c86b | 2524 | switch (type) { |
2525 | case SSH_SMSG_SUCCESS: | |
2526 | success = 1; | |
2527 | break; | |
2528 | case SSH_SMSG_FAILURE: | |
fa08c86b | 2529 | break; |
2530 | default: | |
2531 | /* Unknown packet */ | |
2532 | packet_disconnect("Protocol error for port forward request:" | |
2533 | "received packet type %d.", type); | |
2534 | } | |
2535 | } | |
2536 | if (success) { | |
2537 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host_to_connect); | |
2538 | permitted_opens[num_permitted_opens].port_to_connect = port_to_connect; | |
2539 | permitted_opens[num_permitted_opens].listen_port = listen_port; | |
2540 | num_permitted_opens++; | |
7e7327a1 | 2541 | } |
42ea6f5e | 2542 | return (success ? 0 : -1); |
8efc0c15 | 2543 | } |
2544 | ||
d740ec16 | 2545 | /* |
f2107e97 | 2546 | * Request cancellation of remote forwarding of connection host:port from |
d740ec16 | 2547 | * local side. |
2548 | */ | |
d740ec16 | 2549 | void |
3867aa0a | 2550 | channel_request_rforward_cancel(const char *host, u_short port) |
d740ec16 | 2551 | { |
2552 | int i; | |
d740ec16 | 2553 | |
2554 | if (!compat20) | |
2555 | return; | |
2556 | ||
2557 | for (i = 0; i < num_permitted_opens; i++) { | |
f2107e97 | 2558 | if (permitted_opens[i].host_to_connect != NULL && |
d740ec16 | 2559 | permitted_opens[i].listen_port == port) |
2560 | break; | |
2561 | } | |
2562 | if (i >= num_permitted_opens) { | |
2563 | debug("%s: requested forward not found", __func__); | |
2564 | return; | |
2565 | } | |
2566 | packet_start(SSH2_MSG_GLOBAL_REQUEST); | |
2567 | packet_put_cstring("cancel-tcpip-forward"); | |
2568 | packet_put_char(0); | |
3867aa0a | 2569 | packet_put_cstring(host == NULL ? "" : host); |
d740ec16 | 2570 | packet_put_int(port); |
2571 | packet_send(); | |
2572 | ||
2573 | permitted_opens[i].listen_port = 0; | |
2574 | permitted_opens[i].port_to_connect = 0; | |
8c4bd764 | 2575 | xfree(permitted_opens[i].host_to_connect); |
d740ec16 | 2576 | permitted_opens[i].host_to_connect = NULL; |
2577 | } | |
2578 | ||
aa3378df | 2579 | /* |
2580 | * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates | |
2581 | * listening for the port, and sends back a success reply (or disconnect | |
42ea6f5e | 2582 | * message if there was an error). |
aa3378df | 2583 | */ |
42ea6f5e | 2584 | int |
1d1ffb87 | 2585 | channel_input_port_forward_request(int is_root, int gateway_ports) |
8efc0c15 | 2586 | { |
57112b5a | 2587 | u_short port, host_port; |
42ea6f5e | 2588 | int success = 0; |
5260325f | 2589 | char *hostname; |
2590 | ||
2591 | /* Get arguments from the packet. */ | |
2592 | port = packet_get_int(); | |
2593 | hostname = packet_get_string(NULL); | |
2594 | host_port = packet_get_int(); | |
2595 | ||
3c62e7eb | 2596 | #ifndef HAVE_CYGWIN |
aa3378df | 2597 | /* |
2598 | * Check that an unprivileged user is not trying to forward a | |
2599 | * privileged port. | |
2600 | */ | |
5260325f | 2601 | if (port < IPPORT_RESERVED && !is_root) |
8e7c9afc | 2602 | packet_disconnect( |
2603 | "Requested forwarding of port %d but user is not root.", | |
2604 | port); | |
2605 | if (host_port == 0) | |
2606 | packet_disconnect("Dynamic forwarding denied."); | |
3c62e7eb | 2607 | #endif |
8e7c9afc | 2608 | |
fa08c86b | 2609 | /* Initiate forwarding */ |
42ea6f5e | 2610 | success = channel_setup_local_fwd_listener(NULL, port, hostname, |
3867aa0a | 2611 | host_port, gateway_ports); |
5260325f | 2612 | |
2613 | /* Free the argument string. */ | |
2614 | xfree(hostname); | |
42ea6f5e | 2615 | |
2616 | return (success ? 0 : -1); | |
8efc0c15 | 2617 | } |
2618 | ||
01794848 | 2619 | /* |
2620 | * Permits opening to any host/port if permitted_opens[] is empty. This is | |
2621 | * usually called by the server, because the user could connect to any port | |
2622 | * anyway, and the server has no way to know but to trust the client anyway. | |
2623 | */ | |
2624 | void | |
d5bb9418 | 2625 | channel_permit_all_opens(void) |
01794848 | 2626 | { |
2627 | if (num_permitted_opens == 0) | |
2628 | all_opens_permitted = 1; | |
2629 | } | |
2630 | ||
cd332296 | 2631 | void |
01794848 | 2632 | channel_add_permitted_opens(char *host, int port) |
2633 | { | |
2634 | if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
42ea6f5e | 2635 | fatal("channel_add_permitted_opens: too many forwards"); |
01794848 | 2636 | debug("allow port forwarding to host %s port %d", host, port); |
2637 | ||
2638 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host); | |
2639 | permitted_opens[num_permitted_opens].port_to_connect = port; | |
2640 | num_permitted_opens++; | |
2641 | ||
2642 | all_opens_permitted = 0; | |
2643 | } | |
2644 | ||
cd332296 | 2645 | void |
01794848 | 2646 | channel_clear_permitted_opens(void) |
2647 | { | |
2648 | int i; | |
2649 | ||
2650 | for (i = 0; i < num_permitted_opens; i++) | |
d740ec16 | 2651 | if (permitted_opens[i].host_to_connect != NULL) |
2652 | xfree(permitted_opens[i].host_to_connect); | |
01794848 | 2653 | num_permitted_opens = 0; |
2654 | ||
2655 | } | |
2656 | ||
01794848 | 2657 | /* return socket to remote host, port */ |
396c147e | 2658 | static int |
01794848 | 2659 | connect_to(const char *host, u_short port) |
8efc0c15 | 2660 | { |
48e671d5 | 2661 | struct addrinfo hints, *ai, *aitop; |
2662 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; | |
2663 | int gaierr; | |
7368a6c8 | 2664 | int sock = -1; |
48e671d5 | 2665 | |
2666 | memset(&hints, 0, sizeof(hints)); | |
2667 | hints.ai_family = IPv4or6; | |
2668 | hints.ai_socktype = SOCK_STREAM; | |
01794848 | 2669 | snprintf(strport, sizeof strport, "%d", port); |
48e671d5 | 2670 | if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) { |
01794848 | 2671 | error("connect_to %.100s: unknown host (%s)", host, |
2672 | gai_strerror(gaierr)); | |
7368a6c8 | 2673 | return -1; |
48e671d5 | 2674 | } |
48e671d5 | 2675 | for (ai = aitop; ai; ai = ai->ai_next) { |
2676 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
2677 | continue; | |
2678 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), | |
2679 | strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { | |
01794848 | 2680 | error("connect_to: getnameinfo failed"); |
48e671d5 | 2681 | continue; |
5260325f | 2682 | } |
3e131a6d | 2683 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
48e671d5 | 2684 | if (sock < 0) { |
4940c411 | 2685 | if (ai->ai_next == NULL) |
2686 | error("socket: %.100s", strerror(errno)); | |
2687 | else | |
2688 | verbose("socket: %.100s", strerror(errno)); | |
48e671d5 | 2689 | continue; |
5260325f | 2690 | } |
170694d7 | 2691 | if (set_nonblock(sock) == -1) |
2692 | fatal("%s: set_nonblock(%d)", __func__, sock); | |
97fb6912 | 2693 | if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0 && |
2694 | errno != EINPROGRESS) { | |
01794848 | 2695 | error("connect_to %.100s port %s: %.100s", ntop, strport, |
48e671d5 | 2696 | strerror(errno)); |
2697 | close(sock); | |
2b87da3b | 2698 | continue; /* fail -- try next */ |
48e671d5 | 2699 | } |
2700 | break; /* success */ | |
5260325f | 2701 | |
5260325f | 2702 | } |
48e671d5 | 2703 | freeaddrinfo(aitop); |
48e671d5 | 2704 | if (!ai) { |
01794848 | 2705 | error("connect_to %.100s port %d: failed.", host, port); |
7368a6c8 | 2706 | return -1; |
8efc0c15 | 2707 | } |
7368a6c8 | 2708 | /* success */ |
811a6342 | 2709 | set_nodelay(sock); |
7368a6c8 | 2710 | return sock; |
2711 | } | |
01794848 | 2712 | |
fa08c86b | 2713 | int |
b3f8a79c | 2714 | channel_connect_by_listen_address(u_short listen_port) |
fa08c86b | 2715 | { |
2716 | int i; | |
01794848 | 2717 | |
fa08c86b | 2718 | for (i = 0; i < num_permitted_opens; i++) |
d740ec16 | 2719 | if (permitted_opens[i].host_to_connect != NULL && |
2720 | permitted_opens[i].listen_port == listen_port) | |
01794848 | 2721 | return connect_to( |
fa08c86b | 2722 | permitted_opens[i].host_to_connect, |
2723 | permitted_opens[i].port_to_connect); | |
0b6fbf03 | 2724 | error("WARNING: Server requests forwarding for unknown listen_port %d", |
2725 | listen_port); | |
fa08c86b | 2726 | return -1; |
2727 | } | |
48e671d5 | 2728 | |
01794848 | 2729 | /* Check if connecting to that port is permitted and connect. */ |
2730 | int | |
2731 | channel_connect_to(const char *host, u_short port) | |
2732 | { | |
2733 | int i, permit; | |
2734 | ||
2735 | permit = all_opens_permitted; | |
2736 | if (!permit) { | |
2737 | for (i = 0; i < num_permitted_opens; i++) | |
d740ec16 | 2738 | if (permitted_opens[i].host_to_connect != NULL && |
2739 | permitted_opens[i].port_to_connect == port && | |
01794848 | 2740 | strcmp(permitted_opens[i].host_to_connect, host) == 0) |
2741 | permit = 1; | |
2742 | ||
2743 | } | |
2744 | if (!permit) { | |
bbe88b6d | 2745 | logit("Received request to connect to host %.100s port %d, " |
01794848 | 2746 | "but the request was denied.", host, port); |
2747 | return -1; | |
2748 | } | |
2749 | return connect_to(host, port); | |
2750 | } | |
2751 | ||
5e96b616 | 2752 | void |
2753 | channel_send_window_changes(void) | |
2754 | { | |
9a995072 | 2755 | u_int i; |
5e96b616 | 2756 | struct winsize ws; |
2757 | ||
2758 | for (i = 0; i < channels_alloc; i++) { | |
f8cc7664 | 2759 | if (channels[i] == NULL || !channels[i]->client_tty || |
5e96b616 | 2760 | channels[i]->type != SSH_CHANNEL_OPEN) |
2761 | continue; | |
2762 | if (ioctl(channels[i]->rfd, TIOCGWINSZ, &ws) < 0) | |
2763 | continue; | |
2764 | channel_request_start(i, "window-change", 0); | |
148de80c | 2765 | packet_put_int((u_int)ws.ws_col); |
2766 | packet_put_int((u_int)ws.ws_row); | |
2767 | packet_put_int((u_int)ws.ws_xpixel); | |
2768 | packet_put_int((u_int)ws.ws_ypixel); | |
5e96b616 | 2769 | packet_send(); |
2770 | } | |
2771 | } | |
2772 | ||
8e7895b8 | 2773 | /* -- X11 forwarding */ |
8efc0c15 | 2774 | |
aa3378df | 2775 | /* |
2776 | * Creates an internet domain socket for listening for X11 connections. | |
57f228e8 | 2777 | * Returns 0 and a suitable display number for the DISPLAY variable |
2778 | * stored in display_numberp , or -1 if an error occurs. | |
aa3378df | 2779 | */ |
c9d0ad9b | 2780 | int |
e6e573bd | 2781 | x11_create_display_inet(int x11_display_offset, int x11_use_localhost, |
d08341e6 | 2782 | int single_connection, u_int *display_numberp, int **chanids) |
8efc0c15 | 2783 | { |
ac151b18 | 2784 | Channel *nc = NULL; |
57112b5a | 2785 | int display_number, sock; |
2786 | u_short port; | |
48e671d5 | 2787 | struct addrinfo hints, *ai, *aitop; |
2788 | char strport[NI_MAXSERV]; | |
2789 | int gaierr, n, num_socks = 0, socks[NUM_SOCKS]; | |
5260325f | 2790 | |
59e5aff5 | 2791 | if (chanids == NULL) |
2792 | return -1; | |
2793 | ||
95f1eccc | 2794 | for (display_number = x11_display_offset; |
184eed6a | 2795 | display_number < MAX_DISPLAYS; |
2796 | display_number++) { | |
5260325f | 2797 | port = 6000 + display_number; |
48e671d5 | 2798 | memset(&hints, 0, sizeof(hints)); |
2799 | hints.ai_family = IPv4or6; | |
e6e573bd | 2800 | hints.ai_flags = x11_use_localhost ? 0: AI_PASSIVE; |
48e671d5 | 2801 | hints.ai_socktype = SOCK_STREAM; |
2802 | snprintf(strport, sizeof strport, "%d", port); | |
2803 | if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) { | |
2804 | error("getaddrinfo: %.100s", gai_strerror(gaierr)); | |
c9d0ad9b | 2805 | return -1; |
5260325f | 2806 | } |
48e671d5 | 2807 | for (ai = aitop; ai; ai = ai->ai_next) { |
2808 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
2809 | continue; | |
3e131a6d | 2810 | sock = socket(ai->ai_family, ai->ai_socktype, |
2811 | ai->ai_protocol); | |
48e671d5 | 2812 | if (sock < 0) { |
4ee81249 | 2813 | if ((errno != EINVAL) && (errno != EAFNOSUPPORT)) { |
80a44451 | 2814 | error("socket: %.100s", strerror(errno)); |
0ea89f7e | 2815 | freeaddrinfo(aitop); |
c9d0ad9b | 2816 | return -1; |
80a44451 | 2817 | } else { |
22d89d24 | 2818 | debug("x11_create_display_inet: Socket family %d not supported", |
2819 | ai->ai_family); | |
80a44451 | 2820 | continue; |
2821 | } | |
48e671d5 | 2822 | } |
688aaeda | 2823 | #ifdef IPV6_V6ONLY |
2824 | if (ai->ai_family == AF_INET6) { | |
2825 | int on = 1; | |
2826 | if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) < 0) | |
2827 | error("setsockopt IPV6_V6ONLY: %.100s", strerror(errno)); | |
2828 | } | |
2829 | #endif | |
442aee3a | 2830 | channel_set_reuseaddr(sock); |
48e671d5 | 2831 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { |
d7ac5f18 | 2832 | debug2("bind port %d: %.100s", port, strerror(errno)); |
48e671d5 | 2833 | close(sock); |
16218745 | 2834 | |
2835 | if (ai->ai_next) | |
2836 | continue; | |
2837 | ||
48e671d5 | 2838 | for (n = 0; n < num_socks; n++) { |
48e671d5 | 2839 | close(socks[n]); |
2840 | } | |
2841 | num_socks = 0; | |
2842 | break; | |
2843 | } | |
2844 | socks[num_socks++] = sock; | |
80faa19f | 2845 | #ifndef DONT_TRY_OTHER_AF |
48e671d5 | 2846 | if (num_socks == NUM_SOCKS) |
2847 | break; | |
80faa19f | 2848 | #else |
688aaeda | 2849 | if (x11_use_localhost) { |
2850 | if (num_socks == NUM_SOCKS) | |
2851 | break; | |
2852 | } else { | |
2853 | break; | |
2854 | } | |
80faa19f | 2855 | #endif |
5260325f | 2856 | } |
4ccb01d6 | 2857 | freeaddrinfo(aitop); |
48e671d5 | 2858 | if (num_socks > 0) |
2859 | break; | |
5260325f | 2860 | } |
2861 | if (display_number >= MAX_DISPLAYS) { | |
2862 | error("Failed to allocate internet-domain X11 display socket."); | |
c9d0ad9b | 2863 | return -1; |
8efc0c15 | 2864 | } |
5260325f | 2865 | /* Start listening for connections on the socket. */ |
48e671d5 | 2866 | for (n = 0; n < num_socks; n++) { |
2867 | sock = socks[n]; | |
fce39749 | 2868 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { |
48e671d5 | 2869 | error("listen: %.100s", strerror(errno)); |
48e671d5 | 2870 | close(sock); |
c9d0ad9b | 2871 | return -1; |
a7effaac | 2872 | } |
a7effaac | 2873 | } |
5260325f | 2874 | |
48e671d5 | 2875 | /* Allocate a channel for each socket. */ |
52e3daed | 2876 | *chanids = xcalloc(num_socks + 1, sizeof(**chanids)); |
48e671d5 | 2877 | for (n = 0; n < num_socks; n++) { |
2878 | sock = socks[n]; | |
ac151b18 | 2879 | nc = channel_new("x11 listener", |
0b242b12 | 2880 | SSH_CHANNEL_X11_LISTENER, sock, sock, -1, |
2881 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, | |
0d942eff | 2882 | 0, "X11 inet listener", 1); |
3a0d3d54 | 2883 | nc->single_connection = single_connection; |
59e5aff5 | 2884 | (*chanids)[n] = nc->self; |
48e671d5 | 2885 | } |
59e5aff5 | 2886 | (*chanids)[n] = -1; |
5260325f | 2887 | |
c9d0ad9b | 2888 | /* Return the display number for the DISPLAY environment variable. */ |
57f228e8 | 2889 | *display_numberp = display_number; |
2890 | return (0); | |
8efc0c15 | 2891 | } |
2892 | ||
396c147e | 2893 | static int |
1e3b8b07 | 2894 | connect_local_xsocket(u_int dnr) |
8efc0c15 | 2895 | { |
5260325f | 2896 | int sock; |
2897 | struct sockaddr_un addr; | |
5260325f | 2898 | |
805e659f | 2899 | sock = socket(AF_UNIX, SOCK_STREAM, 0); |
2900 | if (sock < 0) | |
2901 | error("socket: %.100s", strerror(errno)); | |
2902 | memset(&addr, 0, sizeof(addr)); | |
2903 | addr.sun_family = AF_UNIX; | |
2904 | snprintf(addr.sun_path, sizeof addr.sun_path, _PATH_UNIX_X, dnr); | |
32596c7b | 2905 | if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) == 0) |
805e659f | 2906 | return sock; |
2907 | close(sock); | |
5260325f | 2908 | error("connect %.100s: %.100s", addr.sun_path, strerror(errno)); |
2909 | return -1; | |
8efc0c15 | 2910 | } |
2911 | ||
0b242b12 | 2912 | int |
2913 | x11_connect_display(void) | |
8efc0c15 | 2914 | { |
4f16046f | 2915 | u_int display_number; |
5260325f | 2916 | const char *display; |
0b242b12 | 2917 | char buf[1024], *cp; |
48e671d5 | 2918 | struct addrinfo hints, *ai, *aitop; |
2919 | char strport[NI_MAXSERV]; | |
4f16046f | 2920 | int gaierr, sock = 0; |
5260325f | 2921 | |
5260325f | 2922 | /* Try to open a socket for the local X server. */ |
2923 | display = getenv("DISPLAY"); | |
2924 | if (!display) { | |
2925 | error("DISPLAY not set."); | |
0b242b12 | 2926 | return -1; |
5260325f | 2927 | } |
aa3378df | 2928 | /* |
2929 | * Now we decode the value of the DISPLAY variable and make a | |
2930 | * connection to the real X server. | |
2931 | */ | |
2932 | ||
2933 | /* | |
2934 | * Check if it is a unix domain socket. Unix domain displays are in | |
2935 | * one of the following formats: unix:d[.s], :d[.s], ::d[.s] | |
2936 | */ | |
5260325f | 2937 | if (strncmp(display, "unix:", 5) == 0 || |
2938 | display[0] == ':') { | |
2939 | /* Connect to the unix domain socket. */ | |
4f16046f | 2940 | if (sscanf(strrchr(display, ':') + 1, "%u", &display_number) != 1) { |
5260325f | 2941 | error("Could not parse display number from DISPLAY: %.100s", |
184eed6a | 2942 | display); |
0b242b12 | 2943 | return -1; |
5260325f | 2944 | } |
2945 | /* Create a socket. */ | |
2946 | sock = connect_local_xsocket(display_number); | |
2947 | if (sock < 0) | |
0b242b12 | 2948 | return -1; |
5260325f | 2949 | |
2950 | /* OK, we now have a connection to the display. */ | |
0b242b12 | 2951 | return sock; |
5260325f | 2952 | } |
aa3378df | 2953 | /* |
2954 | * Connect to an inet socket. The DISPLAY value is supposedly | |
2955 | * hostname:d[.s], where hostname may also be numeric IP address. | |
2956 | */ | |
74860245 | 2957 | strlcpy(buf, display, sizeof(buf)); |
5260325f | 2958 | cp = strchr(buf, ':'); |
2959 | if (!cp) { | |
2960 | error("Could not find ':' in DISPLAY: %.100s", display); | |
0b242b12 | 2961 | return -1; |
5260325f | 2962 | } |
2963 | *cp = 0; | |
aa3378df | 2964 | /* buf now contains the host name. But first we parse the display number. */ |
4f16046f | 2965 | if (sscanf(cp + 1, "%u", &display_number) != 1) { |
5260325f | 2966 | error("Could not parse display number from DISPLAY: %.100s", |
184eed6a | 2967 | display); |
0b242b12 | 2968 | return -1; |
5260325f | 2969 | } |
5260325f | 2970 | |
48e671d5 | 2971 | /* Look up the host address */ |
2972 | memset(&hints, 0, sizeof(hints)); | |
2973 | hints.ai_family = IPv4or6; | |
2974 | hints.ai_socktype = SOCK_STREAM; | |
4f16046f | 2975 | snprintf(strport, sizeof strport, "%u", 6000 + display_number); |
48e671d5 | 2976 | if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) { |
2977 | error("%.100s: unknown host. (%s)", buf, gai_strerror(gaierr)); | |
0b242b12 | 2978 | return -1; |
8efc0c15 | 2979 | } |
48e671d5 | 2980 | for (ai = aitop; ai; ai = ai->ai_next) { |
2981 | /* Create a socket. */ | |
3e131a6d | 2982 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
48e671d5 | 2983 | if (sock < 0) { |
d7ac5f18 | 2984 | debug2("socket: %.100s", strerror(errno)); |
7368a6c8 | 2985 | continue; |
2986 | } | |
2987 | /* Connect it to the display. */ | |
2988 | if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) { | |
4f16046f | 2989 | debug2("connect %.100s port %u: %.100s", buf, |
7368a6c8 | 2990 | 6000 + display_number, strerror(errno)); |
2991 | close(sock); | |
2992 | continue; | |
2993 | } | |
2994 | /* Success */ | |
2995 | break; | |
48e671d5 | 2996 | } |
48e671d5 | 2997 | freeaddrinfo(aitop); |
2998 | if (!ai) { | |
4f16046f | 2999 | error("connect %.100s port %u: %.100s", buf, 6000 + display_number, |
48e671d5 | 3000 | strerror(errno)); |
0b242b12 | 3001 | return -1; |
8efc0c15 | 3002 | } |
bcc0381e | 3003 | set_nodelay(sock); |
0b242b12 | 3004 | return sock; |
3005 | } | |
5260325f | 3006 | |
0b242b12 | 3007 | /* |
3008 | * This is called when SSH_SMSG_X11_OPEN is received. The packet contains | |
3009 | * the remote channel number. We should do whatever we want, and respond | |
3010 | * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE. | |
3011 | */ | |
5260325f | 3012 | |
0b242b12 | 3013 | void |
7819b5c3 | 3014 | x11_input_open(int type, u_int32_t seq, void *ctxt) |
0b242b12 | 3015 | { |
719fc62f | 3016 | Channel *c = NULL; |
3017 | int remote_id, sock = 0; | |
0b242b12 | 3018 | char *remote_host; |
5260325f | 3019 | |
719fc62f | 3020 | debug("Received X11 open request."); |
5260325f | 3021 | |
719fc62f | 3022 | remote_id = packet_get_int(); |
8e7895b8 | 3023 | |
3024 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) { | |
719fc62f | 3025 | remote_host = packet_get_string(NULL); |
0b242b12 | 3026 | } else { |
3027 | remote_host = xstrdup("unknown (remote did not supply name)"); | |
0b242b12 | 3028 | } |
95500969 | 3029 | packet_check_eom(); |
0b242b12 | 3030 | |
3031 | /* Obtain a connection to the real X display. */ | |
3032 | sock = x11_connect_display(); | |
719fc62f | 3033 | if (sock != -1) { |
3034 | /* Allocate a channel for this connection. */ | |
3035 | c = channel_new("connected x11 socket", | |
3036 | SSH_CHANNEL_X11_OPEN, sock, sock, -1, 0, 0, 0, | |
3037 | remote_host, 1); | |
3a0d3d54 | 3038 | c->remote_id = remote_id; |
3039 | c->force_drain = 1; | |
719fc62f | 3040 | } |
0d942eff | 3041 | xfree(remote_host); |
719fc62f | 3042 | if (c == NULL) { |
0b242b12 | 3043 | /* Send refusal to the remote host. */ |
3044 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
719fc62f | 3045 | packet_put_int(remote_id); |
0b242b12 | 3046 | } else { |
0b242b12 | 3047 | /* Send a confirmation to the remote host. */ |
3048 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
719fc62f | 3049 | packet_put_int(remote_id); |
3050 | packet_put_int(c->self); | |
0b242b12 | 3051 | } |
719fc62f | 3052 | packet_send(); |
8efc0c15 | 3053 | } |
3054 | ||
a22aff1f | 3055 | /* dummy protocol handler that denies SSH-1 requests (agent/x11) */ |
3056 | void | |
7819b5c3 | 3057 | deny_input_open(int type, u_int32_t seq, void *ctxt) |
a22aff1f | 3058 | { |
3059 | int rchan = packet_get_int(); | |
e1feb9bf | 3060 | |
6aacefa7 | 3061 | switch (type) { |
a22aff1f | 3062 | case SSH_SMSG_AGENT_OPEN: |
3063 | error("Warning: ssh server tried agent forwarding."); | |
3064 | break; | |
3065 | case SSH_SMSG_X11_OPEN: | |
3066 | error("Warning: ssh server tried X11 forwarding."); | |
3067 | break; | |
3068 | default: | |
7819b5c3 | 3069 | error("deny_input_open: type %d", type); |
a22aff1f | 3070 | break; |
3071 | } | |
1908529f | 3072 | error("Warning: this is probably a break-in attempt by a malicious server."); |
a22aff1f | 3073 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
3074 | packet_put_int(rchan); | |
3075 | packet_send(); | |
3076 | } | |
3077 | ||
aa3378df | 3078 | /* |
3079 | * Requests forwarding of X11 connections, generates fake authentication | |
3080 | * data, and enables authentication spoofing. | |
8e7895b8 | 3081 | * This should be called in the client only. |
aa3378df | 3082 | */ |
6ae2364d | 3083 | void |
9bf083eb | 3084 | x11_request_forwarding_with_spoofing(int client_session_id, const char *disp, |
0b242b12 | 3085 | const char *proto, const char *data) |
8efc0c15 | 3086 | { |
1e3b8b07 | 3087 | u_int data_len = (u_int) strlen(data) / 2; |
ef07103c | 3088 | u_int i, value; |
5260325f | 3089 | char *new_data; |
3090 | int screen_number; | |
3091 | const char *cp; | |
ca75d7de | 3092 | u_int32_t rnd = 0; |
5260325f | 3093 | |
4297b666 | 3094 | if (x11_saved_display == NULL) |
3095 | x11_saved_display = xstrdup(disp); | |
3096 | else if (strcmp(disp, x11_saved_display) != 0) { | |
ef07103c | 3097 | error("x11_request_forwarding_with_spoofing: different " |
3098 | "$DISPLAY already forwarded"); | |
3099 | return; | |
3100 | } | |
3101 | ||
9bf083eb | 3102 | cp = disp; |
3103 | if (disp) | |
3104 | cp = strchr(disp, ':'); | |
5260325f | 3105 | if (cp) |
3106 | cp = strchr(cp, '.'); | |
3107 | if (cp) | |
d6d4897e | 3108 | screen_number = (u_int)strtonum(cp + 1, 0, 400, NULL); |
5260325f | 3109 | else |
3110 | screen_number = 0; | |
3111 | ||
ef07103c | 3112 | if (x11_saved_proto == NULL) { |
3113 | /* Save protocol name. */ | |
3114 | x11_saved_proto = xstrdup(proto); | |
3115 | /* | |
56964485 | 3116 | * Extract real authentication data and generate fake data |
ef07103c | 3117 | * of the same length. |
3118 | */ | |
3119 | x11_saved_data = xmalloc(data_len); | |
3120 | x11_fake_data = xmalloc(data_len); | |
3121 | for (i = 0; i < data_len; i++) { | |
3122 | if (sscanf(data + 2 * i, "%2x", &value) != 1) | |
3123 | fatal("x11_request_forwarding: bad " | |
3124 | "authentication data: %.100s", data); | |
3125 | if (i % 4 == 0) | |
3126 | rnd = arc4random(); | |
3127 | x11_saved_data[i] = value; | |
3128 | x11_fake_data[i] = rnd & 0xff; | |
3129 | rnd >>= 8; | |
3130 | } | |
3131 | x11_saved_data_len = data_len; | |
3132 | x11_fake_data_len = data_len; | |
3133 | } | |
5260325f | 3134 | |
3135 | /* Convert the fake data into hex. */ | |
ef07103c | 3136 | new_data = tohex(x11_fake_data, data_len); |
5260325f | 3137 | |
3138 | /* Send the request packet. */ | |
0b242b12 | 3139 | if (compat20) { |
3140 | channel_request_start(client_session_id, "x11-req", 0); | |
3141 | packet_put_char(0); /* XXX bool single connection */ | |
3142 | } else { | |
3143 | packet_start(SSH_CMSG_X11_REQUEST_FORWARDING); | |
3144 | } | |
3145 | packet_put_cstring(proto); | |
3146 | packet_put_cstring(new_data); | |
5260325f | 3147 | packet_put_int(screen_number); |
3148 | packet_send(); | |
3149 | packet_write_wait(); | |
3150 | xfree(new_data); | |
8efc0c15 | 3151 | } |
3152 | ||
8e7895b8 | 3153 | |
3154 | /* -- agent forwarding */ | |
3155 | ||
8efc0c15 | 3156 | /* Sends a message to the server to request authentication fd forwarding. */ |
3157 | ||
6ae2364d | 3158 | void |
d5bb9418 | 3159 | auth_request_forwarding(void) |
8efc0c15 | 3160 | { |
5260325f | 3161 | packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING); |
3162 | packet_send(); | |
3163 | packet_write_wait(); | |
8efc0c15 | 3164 | } |