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00146caa | 1 | /* $OpenBSD: channels.c,v 1.260 2006/07/22 20:48:22 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> |
28cb0a43 | 53 | #include <netdb.h> |
00146caa | 54 | #include <string.h> |
1d3e026f | 55 | #include <termios.h> |
5188ba17 | 56 | #include <unistd.h> |
8efc0c15 | 57 | |
58 | #include "ssh.h" | |
42f11eb2 | 59 | #include "ssh1.h" |
60 | #include "ssh2.h" | |
8efc0c15 | 61 | #include "packet.h" |
62 | #include "xmalloc.h" | |
42f11eb2 | 63 | #include "log.h" |
64 | #include "misc.h" | |
8efc0c15 | 65 | #include "channels.h" |
8efc0c15 | 66 | #include "compat.h" |
42f11eb2 | 67 | #include "canohost.h" |
4c8722d9 | 68 | #include "key.h" |
69 | #include "authfd.h" | |
805e659f | 70 | #include "pathnames.h" |
f49658f5 | 71 | #include "bufaux.h" |
8efc0c15 | 72 | |
8e7895b8 | 73 | /* -- channel core */ |
8efc0c15 | 74 | |
aa3378df | 75 | /* |
76 | * Pointer to an array containing all allocated channels. The array is | |
77 | * dynamically extended as needed. | |
78 | */ | |
719fc62f | 79 | static Channel **channels = NULL; |
8efc0c15 | 80 | |
aa3378df | 81 | /* |
82 | * Size of the channel array. All slots of the array must always be | |
719fc62f | 83 | * initialized (at least the type field); unused slots set to NULL |
aa3378df | 84 | */ |
9a995072 | 85 | static u_int channels_alloc = 0; |
8efc0c15 | 86 | |
aa3378df | 87 | /* |
88 | * Maximum file descriptor value used in any of the channels. This is | |
719fc62f | 89 | * updated in channel_new. |
aa3378df | 90 | */ |
39929cdb | 91 | static int channel_max_fd = 0; |
8efc0c15 | 92 | |
8efc0c15 | 93 | |
8e7895b8 | 94 | /* -- tcp forwarding */ |
8efc0c15 | 95 | |
aa3378df | 96 | /* |
97 | * Data structure for storing which hosts are permitted for forward requests. | |
98 | * The local sides of any remote forwards are stored in this array to prevent | |
99 | * a corrupt remote server from accessing arbitrary TCP/IP ports on our local | |
100 | * network (which might be behind a firewall). | |
101 | */ | |
5260325f | 102 | typedef struct { |
7368a6c8 | 103 | char *host_to_connect; /* Connect to 'host'. */ |
104 | u_short port_to_connect; /* Connect to 'port'. */ | |
105 | u_short listen_port; /* Remote side should listen port number. */ | |
8efc0c15 | 106 | } ForwardPermission; |
107 | ||
2fefbadf | 108 | /* List of all permitted host/port pairs to connect by the user. */ |
8efc0c15 | 109 | static ForwardPermission permitted_opens[SSH_MAX_FORWARDS_PER_DIRECTION]; |
8e7895b8 | 110 | |
2fefbadf | 111 | /* List of all permitted host/port pairs to connect by the admin. */ |
112 | static ForwardPermission permitted_adm_opens[SSH_MAX_FORWARDS_PER_DIRECTION]; | |
113 | ||
114 | /* Number of permitted host/port pairs in the array permitted by the user. */ | |
8efc0c15 | 115 | static int num_permitted_opens = 0; |
2fefbadf | 116 | |
117 | /* Number of permitted host/port pair in the array permitted by the admin. */ | |
118 | static int num_adm_permitted_opens = 0; | |
119 | ||
aa3378df | 120 | /* |
121 | * If this is true, all opens are permitted. This is the case on the server | |
122 | * on which we have to trust the client anyway, and the user could do | |
123 | * anything after logging in anyway. | |
124 | */ | |
8efc0c15 | 125 | static int all_opens_permitted = 0; |
126 | ||
8efc0c15 | 127 | |
8e7895b8 | 128 | /* -- X11 forwarding */ |
42f11eb2 | 129 | |
8e7895b8 | 130 | /* Maximum number of fake X11 displays to try. */ |
131 | #define MAX_DISPLAYS 1000 | |
0490e609 | 132 | |
ef07103c | 133 | /* Saved X11 local (client) display. */ |
134 | static char *x11_saved_display = NULL; | |
135 | ||
8e7895b8 | 136 | /* Saved X11 authentication protocol name. */ |
137 | static char *x11_saved_proto = NULL; | |
8efc0c15 | 138 | |
8e7895b8 | 139 | /* Saved X11 authentication data. This is the real data. */ |
140 | static char *x11_saved_data = NULL; | |
141 | static u_int x11_saved_data_len = 0; | |
142 | ||
143 | /* | |
144 | * Fake X11 authentication data. This is what the server will be sending us; | |
145 | * we should replace any occurrences of this by the real data. | |
146 | */ | |
338eb2ab | 147 | static u_char *x11_fake_data = NULL; |
8e7895b8 | 148 | static u_int x11_fake_data_len; |
149 | ||
150 | ||
151 | /* -- agent forwarding */ | |
8efc0c15 | 152 | |
8e7895b8 | 153 | #define NUM_SOCKS 10 |
154 | ||
8e7895b8 | 155 | /* AF_UNSPEC or AF_INET or AF_INET6 */ |
5e4a7219 | 156 | static int IPv4or6 = AF_UNSPEC; |
8e7895b8 | 157 | |
158 | /* helper */ | |
396c147e | 159 | static void port_open_helper(Channel *c, char *rtype); |
8e7895b8 | 160 | |
161 | /* -- channel core */ | |
7368a6c8 | 162 | |
163 | Channel * | |
b872f7f0 | 164 | channel_by_id(int id) |
7368a6c8 | 165 | { |
166 | Channel *c; | |
719fc62f | 167 | |
9a995072 | 168 | if (id < 0 || (u_int)id >= channels_alloc) { |
b872f7f0 | 169 | logit("channel_by_id: %d: bad id", id); |
7368a6c8 | 170 | return NULL; |
171 | } | |
719fc62f | 172 | c = channels[id]; |
173 | if (c == NULL) { | |
b872f7f0 | 174 | logit("channel_by_id: %d: bad id: channel free", id); |
7368a6c8 | 175 | return NULL; |
176 | } | |
177 | return c; | |
178 | } | |
179 | ||
b872f7f0 | 180 | /* |
181 | * Returns the channel if it is allowed to receive protocol messages. | |
182 | * Private channels, like listening sockets, may not receive messages. | |
183 | */ | |
184 | Channel * | |
185 | channel_lookup(int id) | |
186 | { | |
187 | Channel *c; | |
188 | ||
189 | if ((c = channel_by_id(id)) == NULL) | |
190 | return (NULL); | |
191 | ||
c8e9c167 | 192 | switch (c->type) { |
b872f7f0 | 193 | case SSH_CHANNEL_X11_OPEN: |
194 | case SSH_CHANNEL_LARVAL: | |
195 | case SSH_CHANNEL_CONNECTING: | |
196 | case SSH_CHANNEL_DYNAMIC: | |
197 | case SSH_CHANNEL_OPENING: | |
198 | case SSH_CHANNEL_OPEN: | |
199 | case SSH_CHANNEL_INPUT_DRAINING: | |
200 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
201 | return (c); | |
b872f7f0 | 202 | } |
203 | logit("Non-public channel %d, type %d.", id, c->type); | |
204 | return (NULL); | |
205 | } | |
206 | ||
aa3378df | 207 | /* |
1d1ffb87 | 208 | * Register filedescriptors for a channel, used when allocating a channel or |
0fbe8c74 | 209 | * when the channel consumer/producer is ready, e.g. shell exec'd |
aa3378df | 210 | */ |
396c147e | 211 | static void |
a22aff1f | 212 | channel_register_fds(Channel *c, int rfd, int wfd, int efd, |
213 | int extusage, int nonblock) | |
8efc0c15 | 214 | { |
5260325f | 215 | /* Update the maximum file descriptor value. */ |
39929cdb | 216 | channel_max_fd = MAX(channel_max_fd, rfd); |
217 | channel_max_fd = MAX(channel_max_fd, wfd); | |
218 | channel_max_fd = MAX(channel_max_fd, efd); | |
219 | ||
aa3378df | 220 | /* XXX set close-on-exec -markus */ |
1d1ffb87 | 221 | |
0fbe8c74 | 222 | c->rfd = rfd; |
223 | c->wfd = wfd; | |
224 | c->sock = (rfd == wfd) ? rfd : -1; | |
5e96b616 | 225 | c->ctl_fd = -1; /* XXX: set elsewhere */ |
0fbe8c74 | 226 | c->efd = efd; |
227 | c->extended_usage = extusage; | |
a22aff1f | 228 | |
0ae4fe1d | 229 | /* XXX ugly hack: nonblock is only set by the server */ |
230 | if (nonblock && isatty(c->rfd)) { | |
d7ac5f18 | 231 | debug2("channel %d: rfd %d isatty", c->self, c->rfd); |
0ae4fe1d | 232 | c->isatty = 1; |
233 | if (!isatty(c->wfd)) { | |
94dfb550 | 234 | error("channel %d: wfd %d is not a tty?", |
0ae4fe1d | 235 | c->self, c->wfd); |
236 | } | |
237 | } else { | |
238 | c->isatty = 0; | |
239 | } | |
21c2c5cd | 240 | c->wfd_isatty = isatty(c->wfd); |
0ae4fe1d | 241 | |
a22aff1f | 242 | /* enable nonblocking mode */ |
243 | if (nonblock) { | |
244 | if (rfd != -1) | |
245 | set_nonblock(rfd); | |
246 | if (wfd != -1) | |
247 | set_nonblock(wfd); | |
248 | if (efd != -1) | |
249 | set_nonblock(efd); | |
250 | } | |
0fbe8c74 | 251 | } |
252 | ||
253 | /* | |
254 | * Allocate a new channel object and set its type and socket. This will cause | |
255 | * remote_name to be freed. | |
256 | */ | |
719fc62f | 257 | Channel * |
0fbe8c74 | 258 | channel_new(char *ctype, int type, int rfd, int wfd, int efd, |
f91d9a89 | 259 | u_int window, u_int maxpack, int extusage, char *remote_name, int nonblock) |
0fbe8c74 | 260 | { |
9a995072 | 261 | int found; |
262 | u_int i; | |
0fbe8c74 | 263 | Channel *c; |
5260325f | 264 | |
265 | /* Do initial allocation if this is the first call. */ | |
266 | if (channels_alloc == 0) { | |
267 | channels_alloc = 10; | |
52e3daed | 268 | channels = xcalloc(channels_alloc, sizeof(Channel *)); |
5260325f | 269 | for (i = 0; i < channels_alloc; i++) |
719fc62f | 270 | channels[i] = NULL; |
5260325f | 271 | } |
272 | /* Try to find a free slot where to put the new channel. */ | |
273 | for (found = -1, i = 0; i < channels_alloc; i++) | |
719fc62f | 274 | if (channels[i] == NULL) { |
5260325f | 275 | /* Found a free slot. */ |
9a995072 | 276 | found = (int)i; |
5260325f | 277 | break; |
278 | } | |
9a995072 | 279 | if (found < 0) { |
aa3378df | 280 | /* There are no free slots. Take last+1 slot and expand the array. */ |
5260325f | 281 | found = channels_alloc; |
5df8c731 | 282 | if (channels_alloc > 10000) |
283 | fatal("channel_new: internal error: channels_alloc %d " | |
284 | "too big.", channels_alloc); | |
c5d10563 | 285 | channels = xrealloc(channels, channels_alloc + 10, |
286 | sizeof(Channel *)); | |
20419cc1 | 287 | channels_alloc += 10; |
de273eef | 288 | debug2("channel: expanding %d", channels_alloc); |
5260325f | 289 | for (i = found; i < channels_alloc; i++) |
719fc62f | 290 | channels[i] = NULL; |
5260325f | 291 | } |
719fc62f | 292 | /* Initialize and return new channel. */ |
52e3daed | 293 | c = channels[found] = xcalloc(1, sizeof(Channel)); |
5260325f | 294 | buffer_init(&c->input); |
295 | buffer_init(&c->output); | |
7368a6c8 | 296 | buffer_init(&c->extended); |
70bef40e | 297 | c->ostate = CHAN_OUTPUT_OPEN; |
298 | c->istate = CHAN_INPUT_OPEN; | |
299 | c->flags = 0; | |
a22aff1f | 300 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock); |
5260325f | 301 | c->self = found; |
302 | c->type = type; | |
7368a6c8 | 303 | c->ctype = ctype; |
0b242b12 | 304 | c->local_window = window; |
305 | c->local_window_max = window; | |
306 | c->local_consumed = 0; | |
307 | c->local_maxpacket = maxpack; | |
5260325f | 308 | c->remote_id = -1; |
0d942eff | 309 | c->remote_name = xstrdup(remote_name); |
7368a6c8 | 310 | c->remote_window = 0; |
311 | c->remote_maxpacket = 0; | |
a5f82435 | 312 | c->force_drain = 0; |
ac151b18 | 313 | c->single_connection = 0; |
3cf2be58 | 314 | c->detach_user = NULL; |
8cd0437d | 315 | c->detach_close = 0; |
05ca0898 | 316 | c->confirm = NULL; |
5e96b616 | 317 | c->confirm_ctx = NULL; |
2e73a022 | 318 | c->input_filter = NULL; |
c1c6a032 | 319 | c->output_filter = NULL; |
5260325f | 320 | debug("channel %d: new [%s]", found, remote_name); |
719fc62f | 321 | return c; |
7368a6c8 | 322 | } |
8efc0c15 | 323 | |
489aa2e9 | 324 | static int |
325 | channel_find_maxfd(void) | |
326 | { | |
9a995072 | 327 | u_int i; |
328 | int max = 0; | |
489aa2e9 | 329 | Channel *c; |
330 | ||
331 | for (i = 0; i < channels_alloc; i++) { | |
332 | c = channels[i]; | |
333 | if (c != NULL) { | |
334 | max = MAX(max, c->rfd); | |
335 | max = MAX(max, c->wfd); | |
336 | max = MAX(max, c->efd); | |
337 | } | |
338 | } | |
339 | return max; | |
340 | } | |
341 | ||
342 | int | |
343 | channel_close_fd(int *fdp) | |
344 | { | |
345 | int ret = 0, fd = *fdp; | |
346 | ||
347 | if (fd != -1) { | |
348 | ret = close(fd); | |
349 | *fdp = -1; | |
350 | if (fd == channel_max_fd) | |
351 | channel_max_fd = channel_find_maxfd(); | |
352 | } | |
353 | return ret; | |
354 | } | |
355 | ||
0fbe8c74 | 356 | /* Close all channel fd/socket. */ |
396c147e | 357 | static void |
0fbe8c74 | 358 | channel_close_fds(Channel *c) |
359 | { | |
5e96b616 | 360 | debug3("channel %d: close_fds r %d w %d e %d c %d", |
361 | c->self, c->rfd, c->wfd, c->efd, c->ctl_fd); | |
6fd8622b | 362 | |
489aa2e9 | 363 | channel_close_fd(&c->sock); |
5e96b616 | 364 | channel_close_fd(&c->ctl_fd); |
489aa2e9 | 365 | channel_close_fd(&c->rfd); |
366 | channel_close_fd(&c->wfd); | |
367 | channel_close_fd(&c->efd); | |
0fbe8c74 | 368 | } |
369 | ||
8e7895b8 | 370 | /* Free the channel and close its fd/socket. */ |
8e7895b8 | 371 | void |
372 | channel_free(Channel *c) | |
373 | { | |
374 | char *s; | |
9a995072 | 375 | u_int i, n; |
8e7895b8 | 376 | |
377 | for (n = 0, i = 0; i < channels_alloc; i++) | |
378 | if (channels[i]) | |
379 | n++; | |
9a995072 | 380 | debug("channel %d: free: %s, nchannels %u", c->self, |
8e7895b8 | 381 | c->remote_name ? c->remote_name : "???", n); |
382 | ||
383 | s = channel_open_message(); | |
d7ac5f18 | 384 | debug3("channel %d: status: %s", c->self, s); |
8e7895b8 | 385 | xfree(s); |
386 | ||
8e7895b8 | 387 | if (c->sock != -1) |
388 | shutdown(c->sock, SHUT_RDWR); | |
5e96b616 | 389 | if (c->ctl_fd != -1) |
390 | shutdown(c->ctl_fd, SHUT_RDWR); | |
8e7895b8 | 391 | channel_close_fds(c); |
392 | buffer_free(&c->input); | |
393 | buffer_free(&c->output); | |
394 | buffer_free(&c->extended); | |
395 | if (c->remote_name) { | |
396 | xfree(c->remote_name); | |
397 | c->remote_name = NULL; | |
398 | } | |
399 | channels[c->self] = NULL; | |
400 | xfree(c); | |
401 | } | |
402 | ||
8e7895b8 | 403 | void |
d6746a0b | 404 | channel_free_all(void) |
8e7895b8 | 405 | { |
9a995072 | 406 | u_int i; |
8e7895b8 | 407 | |
d6746a0b | 408 | for (i = 0; i < channels_alloc; i++) |
409 | if (channels[i] != NULL) | |
410 | channel_free(channels[i]); | |
8e7895b8 | 411 | } |
412 | ||
413 | /* | |
414 | * Closes the sockets/fds of all channels. This is used to close extra file | |
415 | * descriptors after a fork. | |
416 | */ | |
8e7895b8 | 417 | void |
d5bb9418 | 418 | channel_close_all(void) |
8e7895b8 | 419 | { |
9a995072 | 420 | u_int i; |
8e7895b8 | 421 | |
422 | for (i = 0; i < channels_alloc; i++) | |
423 | if (channels[i] != NULL) | |
424 | channel_close_fds(channels[i]); | |
425 | } | |
426 | ||
3cf2be58 | 427 | /* |
428 | * Stop listening to channels. | |
429 | */ | |
3cf2be58 | 430 | void |
431 | channel_stop_listening(void) | |
432 | { | |
9a995072 | 433 | u_int i; |
3cf2be58 | 434 | Channel *c; |
435 | ||
436 | for (i = 0; i < channels_alloc; i++) { | |
437 | c = channels[i]; | |
438 | if (c != NULL) { | |
439 | switch (c->type) { | |
440 | case SSH_CHANNEL_AUTH_SOCKET: | |
441 | case SSH_CHANNEL_PORT_LISTENER: | |
442 | case SSH_CHANNEL_RPORT_LISTENER: | |
443 | case SSH_CHANNEL_X11_LISTENER: | |
489aa2e9 | 444 | channel_close_fd(&c->sock); |
3cf2be58 | 445 | channel_free(c); |
446 | break; | |
447 | } | |
448 | } | |
449 | } | |
450 | } | |
451 | ||
8e7895b8 | 452 | /* |
453 | * Returns true if no channel has too much buffered data, and false if one or | |
454 | * more channel is overfull. | |
455 | */ | |
8e7895b8 | 456 | int |
d5bb9418 | 457 | channel_not_very_much_buffered_data(void) |
8e7895b8 | 458 | { |
459 | u_int i; | |
460 | Channel *c; | |
461 | ||
462 | for (i = 0; i < channels_alloc; i++) { | |
463 | c = channels[i]; | |
464 | if (c != NULL && c->type == SSH_CHANNEL_OPEN) { | |
0c139bd1 | 465 | #if 0 |
466 | if (!compat20 && | |
467 | buffer_len(&c->input) > packet_get_maxsize()) { | |
faa483fa | 468 | debug2("channel %d: big input buffer %d", |
8e7895b8 | 469 | c->self, buffer_len(&c->input)); |
470 | return 0; | |
471 | } | |
0c139bd1 | 472 | #endif |
8e7895b8 | 473 | if (buffer_len(&c->output) > packet_get_maxsize()) { |
a27002e5 | 474 | debug2("channel %d: big output buffer %u > %u", |
0c139bd1 | 475 | c->self, buffer_len(&c->output), |
476 | packet_get_maxsize()); | |
8e7895b8 | 477 | return 0; |
478 | } | |
479 | } | |
480 | } | |
481 | return 1; | |
482 | } | |
483 | ||
484 | /* Returns true if any channel is still open. */ | |
8e7895b8 | 485 | int |
d5bb9418 | 486 | channel_still_open(void) |
8e7895b8 | 487 | { |
9a995072 | 488 | u_int i; |
8e7895b8 | 489 | Channel *c; |
490 | ||
491 | for (i = 0; i < channels_alloc; i++) { | |
492 | c = channels[i]; | |
493 | if (c == NULL) | |
494 | continue; | |
495 | switch (c->type) { | |
496 | case SSH_CHANNEL_X11_LISTENER: | |
497 | case SSH_CHANNEL_PORT_LISTENER: | |
498 | case SSH_CHANNEL_RPORT_LISTENER: | |
499 | case SSH_CHANNEL_CLOSED: | |
500 | case SSH_CHANNEL_AUTH_SOCKET: | |
501 | case SSH_CHANNEL_DYNAMIC: | |
502 | case SSH_CHANNEL_CONNECTING: | |
503 | case SSH_CHANNEL_ZOMBIE: | |
504 | continue; | |
505 | case SSH_CHANNEL_LARVAL: | |
506 | if (!compat20) | |
507 | fatal("cannot happen: SSH_CHANNEL_LARVAL"); | |
508 | continue; | |
509 | case SSH_CHANNEL_OPENING: | |
510 | case SSH_CHANNEL_OPEN: | |
511 | case SSH_CHANNEL_X11_OPEN: | |
512 | return 1; | |
513 | case SSH_CHANNEL_INPUT_DRAINING: | |
514 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
515 | if (!compat13) | |
516 | fatal("cannot happen: OUT_DRAIN"); | |
517 | return 1; | |
518 | default: | |
519 | fatal("channel_still_open: bad channel type %d", c->type); | |
520 | /* NOTREACHED */ | |
521 | } | |
522 | } | |
523 | return 0; | |
524 | } | |
525 | ||
526 | /* Returns the id of an open channel suitable for keepaliving */ | |
8e7895b8 | 527 | int |
d5bb9418 | 528 | channel_find_open(void) |
8e7895b8 | 529 | { |
9a995072 | 530 | u_int i; |
8e7895b8 | 531 | Channel *c; |
532 | ||
533 | for (i = 0; i < channels_alloc; i++) { | |
534 | c = channels[i]; | |
13de3560 | 535 | if (c == NULL || c->remote_id < 0) |
8e7895b8 | 536 | continue; |
537 | switch (c->type) { | |
538 | case SSH_CHANNEL_CLOSED: | |
539 | case SSH_CHANNEL_DYNAMIC: | |
540 | case SSH_CHANNEL_X11_LISTENER: | |
541 | case SSH_CHANNEL_PORT_LISTENER: | |
542 | case SSH_CHANNEL_RPORT_LISTENER: | |
543 | case SSH_CHANNEL_OPENING: | |
544 | case SSH_CHANNEL_CONNECTING: | |
545 | case SSH_CHANNEL_ZOMBIE: | |
546 | continue; | |
547 | case SSH_CHANNEL_LARVAL: | |
548 | case SSH_CHANNEL_AUTH_SOCKET: | |
549 | case SSH_CHANNEL_OPEN: | |
550 | case SSH_CHANNEL_X11_OPEN: | |
551 | return i; | |
552 | case SSH_CHANNEL_INPUT_DRAINING: | |
553 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
554 | if (!compat13) | |
555 | fatal("cannot happen: OUT_DRAIN"); | |
556 | return i; | |
557 | default: | |
558 | fatal("channel_find_open: bad channel type %d", c->type); | |
559 | /* NOTREACHED */ | |
560 | } | |
561 | } | |
562 | return -1; | |
563 | } | |
564 | ||
565 | ||
566 | /* | |
567 | * Returns a message describing the currently open forwarded connections, | |
568 | * suitable for sending to the client. The message contains crlf pairs for | |
569 | * newlines. | |
570 | */ | |
8e7895b8 | 571 | char * |
d5bb9418 | 572 | channel_open_message(void) |
8e7895b8 | 573 | { |
574 | Buffer buffer; | |
575 | Channel *c; | |
576 | char buf[1024], *cp; | |
9a995072 | 577 | u_int i; |
8e7895b8 | 578 | |
579 | buffer_init(&buffer); | |
580 | snprintf(buf, sizeof buf, "The following connections are open:\r\n"); | |
581 | buffer_append(&buffer, buf, strlen(buf)); | |
582 | for (i = 0; i < channels_alloc; i++) { | |
583 | c = channels[i]; | |
584 | if (c == NULL) | |
585 | continue; | |
586 | switch (c->type) { | |
587 | case SSH_CHANNEL_X11_LISTENER: | |
588 | case SSH_CHANNEL_PORT_LISTENER: | |
589 | case SSH_CHANNEL_RPORT_LISTENER: | |
590 | case SSH_CHANNEL_CLOSED: | |
591 | case SSH_CHANNEL_AUTH_SOCKET: | |
592 | case SSH_CHANNEL_ZOMBIE: | |
593 | continue; | |
594 | case SSH_CHANNEL_LARVAL: | |
595 | case SSH_CHANNEL_OPENING: | |
596 | case SSH_CHANNEL_CONNECTING: | |
597 | case SSH_CHANNEL_DYNAMIC: | |
598 | case SSH_CHANNEL_OPEN: | |
599 | case SSH_CHANNEL_X11_OPEN: | |
600 | case SSH_CHANNEL_INPUT_DRAINING: | |
601 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
5e96b616 | 602 | snprintf(buf, sizeof buf, |
603 | " #%d %.300s (t%d r%d i%d/%d o%d/%d fd %d/%d cfd %d)\r\n", | |
8e7895b8 | 604 | c->self, c->remote_name, |
605 | c->type, c->remote_id, | |
606 | c->istate, buffer_len(&c->input), | |
607 | c->ostate, buffer_len(&c->output), | |
5e96b616 | 608 | c->rfd, c->wfd, c->ctl_fd); |
8e7895b8 | 609 | buffer_append(&buffer, buf, strlen(buf)); |
610 | continue; | |
611 | default: | |
612 | fatal("channel_open_message: bad channel type %d", c->type); | |
613 | /* NOTREACHED */ | |
614 | } | |
615 | } | |
616 | buffer_append(&buffer, "\0", 1); | |
617 | cp = xstrdup(buffer_ptr(&buffer)); | |
618 | buffer_free(&buffer); | |
619 | return cp; | |
620 | } | |
621 | ||
622 | void | |
623 | channel_send_open(int id) | |
624 | { | |
625 | Channel *c = channel_lookup(id); | |
e1feb9bf | 626 | |
8e7895b8 | 627 | if (c == NULL) { |
bbe88b6d | 628 | logit("channel_send_open: %d: bad id", id); |
8e7895b8 | 629 | return; |
630 | } | |
6226a8f8 | 631 | debug2("channel %d: send open", id); |
8e7895b8 | 632 | packet_start(SSH2_MSG_CHANNEL_OPEN); |
633 | packet_put_cstring(c->ctype); | |
634 | packet_put_int(c->self); | |
635 | packet_put_int(c->local_window); | |
636 | packet_put_int(c->local_maxpacket); | |
637 | packet_send(); | |
638 | } | |
639 | ||
640 | void | |
6226a8f8 | 641 | channel_request_start(int id, char *service, int wantconfirm) |
8e7895b8 | 642 | { |
6226a8f8 | 643 | Channel *c = channel_lookup(id); |
e1feb9bf | 644 | |
8e7895b8 | 645 | if (c == NULL) { |
bbe88b6d | 646 | logit("channel_request_start: %d: unknown channel id", id); |
8e7895b8 | 647 | return; |
648 | } | |
5e96b616 | 649 | debug2("channel %d: request %s confirm %d", id, service, wantconfirm); |
8e7895b8 | 650 | packet_start(SSH2_MSG_CHANNEL_REQUEST); |
651 | packet_put_int(c->remote_id); | |
652 | packet_put_cstring(service); | |
653 | packet_put_char(wantconfirm); | |
654 | } | |
a7137f6b | 655 | |
8e7895b8 | 656 | void |
5e96b616 | 657 | channel_register_confirm(int id, channel_callback_fn *fn, void *ctx) |
8e7895b8 | 658 | { |
659 | Channel *c = channel_lookup(id); | |
e1feb9bf | 660 | |
8e7895b8 | 661 | if (c == NULL) { |
bbe88b6d | 662 | logit("channel_register_comfirm: %d: bad id", id); |
8e7895b8 | 663 | return; |
664 | } | |
05ca0898 | 665 | c->confirm = fn; |
5e96b616 | 666 | c->confirm_ctx = ctx; |
8e7895b8 | 667 | } |
a7137f6b | 668 | |
8e7895b8 | 669 | void |
8cd0437d | 670 | channel_register_cleanup(int id, channel_callback_fn *fn, int do_close) |
8e7895b8 | 671 | { |
b872f7f0 | 672 | Channel *c = channel_by_id(id); |
e1feb9bf | 673 | |
8e7895b8 | 674 | if (c == NULL) { |
bbe88b6d | 675 | logit("channel_register_cleanup: %d: bad id", id); |
8e7895b8 | 676 | return; |
677 | } | |
3cf2be58 | 678 | c->detach_user = fn; |
8cd0437d | 679 | c->detach_close = do_close; |
8e7895b8 | 680 | } |
a7137f6b | 681 | |
8e7895b8 | 682 | void |
683 | channel_cancel_cleanup(int id) | |
684 | { | |
b872f7f0 | 685 | Channel *c = channel_by_id(id); |
e1feb9bf | 686 | |
8e7895b8 | 687 | if (c == NULL) { |
bbe88b6d | 688 | logit("channel_cancel_cleanup: %d: bad id", id); |
8e7895b8 | 689 | return; |
690 | } | |
3cf2be58 | 691 | c->detach_user = NULL; |
8cd0437d | 692 | c->detach_close = 0; |
8e7895b8 | 693 | } |
a7137f6b | 694 | |
8e7895b8 | 695 | void |
c1c6a032 | 696 | channel_register_filter(int id, channel_infilter_fn *ifn, |
697 | channel_outfilter_fn *ofn) | |
8e7895b8 | 698 | { |
699 | Channel *c = channel_lookup(id); | |
e1feb9bf | 700 | |
8e7895b8 | 701 | if (c == NULL) { |
bbe88b6d | 702 | logit("channel_register_filter: %d: bad id", id); |
8e7895b8 | 703 | return; |
704 | } | |
c1c6a032 | 705 | c->input_filter = ifn; |
706 | c->output_filter = ofn; | |
8e7895b8 | 707 | } |
708 | ||
6ae2364d | 709 | void |
8e7895b8 | 710 | channel_set_fds(int id, int rfd, int wfd, int efd, |
399d1ea6 | 711 | int extusage, int nonblock, u_int window_max) |
8efc0c15 | 712 | { |
8e7895b8 | 713 | Channel *c = channel_lookup(id); |
e1feb9bf | 714 | |
8e7895b8 | 715 | if (c == NULL || c->type != SSH_CHANNEL_LARVAL) |
716 | fatal("channel_activate for non-larval channel %d.", id); | |
717 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock); | |
718 | c->type = SSH_CHANNEL_OPEN; | |
399d1ea6 | 719 | c->local_window = c->local_window_max = window_max; |
8e7895b8 | 720 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
721 | packet_put_int(c->remote_id); | |
722 | packet_put_int(c->local_window); | |
723 | packet_send(); | |
8efc0c15 | 724 | } |
725 | ||
aa3378df | 726 | /* |
7368a6c8 | 727 | * 'channel_pre*' are called just before select() to add any bits relevant to |
728 | * channels in the select bitmasks. | |
aa3378df | 729 | */ |
7368a6c8 | 730 | /* |
731 | * 'channel_post*': perform any appropriate operations for channels which | |
732 | * have events pending. | |
733 | */ | |
c8e9c167 | 734 | typedef void chan_fn(Channel *c, fd_set *readset, fd_set *writeset); |
7368a6c8 | 735 | chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE]; |
736 | chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE]; | |
8efc0c15 | 737 | |
ebb90778 | 738 | /* ARGSUSED */ |
396c147e | 739 | static void |
c8e9c167 | 740 | channel_pre_listener(Channel *c, fd_set *readset, fd_set *writeset) |
8efc0c15 | 741 | { |
7368a6c8 | 742 | FD_SET(c->sock, readset); |
743 | } | |
5260325f | 744 | |
ebb90778 | 745 | /* ARGSUSED */ |
396c147e | 746 | static void |
c8e9c167 | 747 | channel_pre_connecting(Channel *c, fd_set *readset, fd_set *writeset) |
97fb6912 | 748 | { |
749 | debug3("channel %d: waiting for connection", c->self); | |
750 | FD_SET(c->sock, writeset); | |
751 | } | |
752 | ||
396c147e | 753 | static void |
c8e9c167 | 754 | channel_pre_open_13(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 755 | { |
756 | if (buffer_len(&c->input) < packet_get_maxsize()) | |
757 | FD_SET(c->sock, readset); | |
758 | if (buffer_len(&c->output) > 0) | |
759 | FD_SET(c->sock, writeset); | |
760 | } | |
5260325f | 761 | |
396c147e | 762 | static void |
c8e9c167 | 763 | channel_pre_open(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 764 | { |
0c0738d5 | 765 | u_int limit = compat20 ? c->remote_window : packet_get_maxsize(); |
5260325f | 766 | |
7e7327a1 | 767 | if (c->istate == CHAN_INPUT_OPEN && |
0c0738d5 | 768 | limit > 0 && |
69d9d413 | 769 | buffer_len(&c->input) < limit && |
770 | buffer_check_alloc(&c->input, CHAN_RBUF)) | |
7e7327a1 | 771 | FD_SET(c->rfd, readset); |
772 | if (c->ostate == CHAN_OUTPUT_OPEN || | |
773 | c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { | |
774 | if (buffer_len(&c->output) > 0) { | |
775 | FD_SET(c->wfd, writeset); | |
776 | } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { | |
d2296ed7 | 777 | if (CHANNEL_EFD_OUTPUT_ACTIVE(c)) |
4e2e5cfd | 778 | debug2("channel %d: obuf_empty delayed efd %d/(%d)", |
779 | c->self, c->efd, buffer_len(&c->extended)); | |
d2296ed7 | 780 | else |
781 | chan_obuf_empty(c); | |
7e7327a1 | 782 | } |
783 | } | |
784 | /** XXX check close conditions, too */ | |
0c0738d5 | 785 | if (compat20 && c->efd != -1) { |
7e7327a1 | 786 | if (c->extended_usage == CHAN_EXTENDED_WRITE && |
787 | buffer_len(&c->extended) > 0) | |
788 | FD_SET(c->efd, writeset); | |
d2296ed7 | 789 | else if (!(c->flags & CHAN_EOF_SENT) && |
790 | c->extended_usage == CHAN_EXTENDED_READ && | |
7e7327a1 | 791 | buffer_len(&c->extended) < c->remote_window) |
792 | FD_SET(c->efd, readset); | |
793 | } | |
5e96b616 | 794 | /* XXX: What about efd? races? */ |
f2107e97 | 795 | if (compat20 && c->ctl_fd != -1 && |
5e96b616 | 796 | c->istate == CHAN_INPUT_OPEN && c->ostate == CHAN_OUTPUT_OPEN) |
797 | FD_SET(c->ctl_fd, readset); | |
7e7327a1 | 798 | } |
799 | ||
ebb90778 | 800 | /* ARGSUSED */ |
396c147e | 801 | static void |
c8e9c167 | 802 | channel_pre_input_draining(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 803 | { |
804 | if (buffer_len(&c->input) == 0) { | |
805 | packet_start(SSH_MSG_CHANNEL_CLOSE); | |
806 | packet_put_int(c->remote_id); | |
807 | packet_send(); | |
808 | c->type = SSH_CHANNEL_CLOSED; | |
d7ac5f18 | 809 | debug2("channel %d: closing after input drain.", c->self); |
7368a6c8 | 810 | } |
811 | } | |
5260325f | 812 | |
ebb90778 | 813 | /* ARGSUSED */ |
396c147e | 814 | static void |
c8e9c167 | 815 | channel_pre_output_draining(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 816 | { |
817 | if (buffer_len(&c->output) == 0) | |
719fc62f | 818 | chan_mark_dead(c); |
6ae2364d | 819 | else |
7368a6c8 | 820 | FD_SET(c->sock, writeset); |
821 | } | |
5260325f | 822 | |
7368a6c8 | 823 | /* |
824 | * This is a special state for X11 authentication spoofing. An opened X11 | |
825 | * connection (when authentication spoofing is being done) remains in this | |
826 | * state until the first packet has been completely read. The authentication | |
827 | * data in that packet is then substituted by the real data if it matches the | |
828 | * fake data, and the channel is put into normal mode. | |
0b242b12 | 829 | * XXX All this happens at the client side. |
8e7895b8 | 830 | * Returns: 0 = need more data, -1 = wrong cookie, 1 = ok |
7368a6c8 | 831 | */ |
396c147e | 832 | static int |
8e7895b8 | 833 | x11_open_helper(Buffer *b) |
7368a6c8 | 834 | { |
1e3b8b07 | 835 | u_char *ucp; |
836 | u_int proto_len, data_len; | |
5260325f | 837 | |
7368a6c8 | 838 | /* Check if the fixed size part of the packet is in buffer. */ |
8e7895b8 | 839 | if (buffer_len(b) < 12) |
7368a6c8 | 840 | return 0; |
841 | ||
842 | /* Parse the lengths of variable-length fields. */ | |
20905a8e | 843 | ucp = buffer_ptr(b); |
7368a6c8 | 844 | if (ucp[0] == 0x42) { /* Byte order MSB first. */ |
845 | proto_len = 256 * ucp[6] + ucp[7]; | |
846 | data_len = 256 * ucp[8] + ucp[9]; | |
847 | } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */ | |
848 | proto_len = ucp[6] + 256 * ucp[7]; | |
849 | data_len = ucp[8] + 256 * ucp[9]; | |
850 | } else { | |
d7ac5f18 | 851 | debug2("Initial X11 packet contains bad byte order byte: 0x%x", |
184eed6a | 852 | ucp[0]); |
7368a6c8 | 853 | return -1; |
854 | } | |
5260325f | 855 | |
7368a6c8 | 856 | /* Check if the whole packet is in buffer. */ |
8e7895b8 | 857 | if (buffer_len(b) < |
7368a6c8 | 858 | 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3)) |
859 | return 0; | |
5260325f | 860 | |
7368a6c8 | 861 | /* Check if authentication protocol matches. */ |
862 | if (proto_len != strlen(x11_saved_proto) || | |
863 | memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) { | |
d7ac5f18 | 864 | debug2("X11 connection uses different authentication protocol."); |
7368a6c8 | 865 | return -1; |
866 | } | |
867 | /* Check if authentication data matches our fake data. */ | |
868 | if (data_len != x11_fake_data_len || | |
869 | memcmp(ucp + 12 + ((proto_len + 3) & ~3), | |
870 | x11_fake_data, x11_fake_data_len) != 0) { | |
d7ac5f18 | 871 | debug2("X11 auth data does not match fake data."); |
7368a6c8 | 872 | return -1; |
873 | } | |
874 | /* Check fake data length */ | |
875 | if (x11_fake_data_len != x11_saved_data_len) { | |
876 | error("X11 fake_data_len %d != saved_data_len %d", | |
877 | x11_fake_data_len, x11_saved_data_len); | |
878 | return -1; | |
879 | } | |
880 | /* | |
881 | * Received authentication protocol and data match | |
882 | * our fake data. Substitute the fake data with real | |
883 | * data. | |
884 | */ | |
885 | memcpy(ucp + 12 + ((proto_len + 3) & ~3), | |
886 | x11_saved_data, x11_saved_data_len); | |
887 | return 1; | |
888 | } | |
5260325f | 889 | |
396c147e | 890 | static void |
c8e9c167 | 891 | channel_pre_x11_open_13(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 892 | { |
8e7895b8 | 893 | int ret = x11_open_helper(&c->output); |
e1feb9bf | 894 | |
7368a6c8 | 895 | if (ret == 1) { |
896 | /* Start normal processing for the channel. */ | |
897 | c->type = SSH_CHANNEL_OPEN; | |
a8be9f80 | 898 | channel_pre_open_13(c, readset, writeset); |
7368a6c8 | 899 | } else if (ret == -1) { |
900 | /* | |
901 | * We have received an X11 connection that has bad | |
902 | * authentication information. | |
903 | */ | |
bbe88b6d | 904 | logit("X11 connection rejected because of wrong authentication."); |
7368a6c8 | 905 | buffer_clear(&c->input); |
906 | buffer_clear(&c->output); | |
489aa2e9 | 907 | channel_close_fd(&c->sock); |
7368a6c8 | 908 | c->sock = -1; |
909 | c->type = SSH_CHANNEL_CLOSED; | |
910 | packet_start(SSH_MSG_CHANNEL_CLOSE); | |
911 | packet_put_int(c->remote_id); | |
912 | packet_send(); | |
913 | } | |
914 | } | |
5260325f | 915 | |
396c147e | 916 | static void |
c8e9c167 | 917 | channel_pre_x11_open(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 918 | { |
8e7895b8 | 919 | int ret = x11_open_helper(&c->output); |
a5f82435 | 920 | |
921 | /* c->force_drain = 1; */ | |
922 | ||
7368a6c8 | 923 | if (ret == 1) { |
924 | c->type = SSH_CHANNEL_OPEN; | |
0c0738d5 | 925 | channel_pre_open(c, readset, writeset); |
7368a6c8 | 926 | } else if (ret == -1) { |
bbe88b6d | 927 | logit("X11 connection rejected because of wrong authentication."); |
d7ac5f18 | 928 | debug2("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate); |
8341f420 | 929 | chan_read_failed(c); |
930 | buffer_clear(&c->input); | |
931 | chan_ibuf_empty(c); | |
932 | buffer_clear(&c->output); | |
933 | /* for proto v1, the peer will send an IEOF */ | |
934 | if (compat20) | |
935 | chan_write_failed(c); | |
936 | else | |
937 | c->type = SSH_CHANNEL_OPEN; | |
d7ac5f18 | 938 | debug2("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate); |
7368a6c8 | 939 | } |
940 | } | |
5260325f | 941 | |
28b9cb4d | 942 | /* try to decode a socks4 header */ |
ebb90778 | 943 | /* ARGSUSED */ |
396c147e | 944 | static int |
c8e9c167 | 945 | channel_decode_socks4(Channel *c, fd_set *readset, fd_set *writeset) |
0490e609 | 946 | { |
661e45a0 | 947 | char *p, *host; |
2ceb8101 | 948 | u_int len, have, i, found; |
184eed6a | 949 | char username[256]; |
0490e609 | 950 | struct { |
951 | u_int8_t version; | |
952 | u_int8_t command; | |
953 | u_int16_t dest_port; | |
28b9cb4d | 954 | struct in_addr dest_addr; |
0490e609 | 955 | } s4_req, s4_rsp; |
956 | ||
28b9cb4d | 957 | debug2("channel %d: decode socks4", c->self); |
53b8fe68 | 958 | |
959 | have = buffer_len(&c->input); | |
960 | len = sizeof(s4_req); | |
961 | if (have < len) | |
962 | return 0; | |
963 | p = buffer_ptr(&c->input); | |
964 | for (found = 0, i = len; i < have; i++) { | |
965 | if (p[i] == '\0') { | |
966 | found = 1; | |
967 | break; | |
968 | } | |
969 | if (i > 1024) { | |
970 | /* the peer is probably sending garbage */ | |
971 | debug("channel %d: decode socks4: too long", | |
972 | c->self); | |
973 | return -1; | |
974 | } | |
975 | } | |
976 | if (!found) | |
977 | return 0; | |
0490e609 | 978 | buffer_get(&c->input, (char *)&s4_req.version, 1); |
979 | buffer_get(&c->input, (char *)&s4_req.command, 1); | |
980 | buffer_get(&c->input, (char *)&s4_req.dest_port, 2); | |
28b9cb4d | 981 | buffer_get(&c->input, (char *)&s4_req.dest_addr, 4); |
53b8fe68 | 982 | have = buffer_len(&c->input); |
0490e609 | 983 | p = buffer_ptr(&c->input); |
984 | len = strlen(p); | |
6683b40f | 985 | debug2("channel %d: decode socks4: user %s/%d", c->self, p, len); |
0490e609 | 986 | if (len > have) |
28b9cb4d | 987 | fatal("channel %d: decode socks4: len %d > have %d", |
0490e609 | 988 | c->self, len, have); |
989 | strlcpy(username, p, sizeof(username)); | |
990 | buffer_consume(&c->input, len); | |
991 | buffer_consume(&c->input, 1); /* trailing '\0' */ | |
992 | ||
28b9cb4d | 993 | host = inet_ntoa(s4_req.dest_addr); |
0490e609 | 994 | strlcpy(c->path, host, sizeof(c->path)); |
995 | c->host_port = ntohs(s4_req.dest_port); | |
184eed6a | 996 | |
d7ac5f18 | 997 | debug2("channel %d: dynamic request: socks4 host %s port %u command %u", |
6683b40f | 998 | c->self, host, c->host_port, s4_req.command); |
0490e609 | 999 | |
28b9cb4d | 1000 | if (s4_req.command != 1) { |
1001 | debug("channel %d: cannot handle: socks4 cn %d", | |
1002 | c->self, s4_req.command); | |
1003 | return -1; | |
0490e609 | 1004 | } |
28b9cb4d | 1005 | s4_rsp.version = 0; /* vn: 0 for reply */ |
1006 | s4_rsp.command = 90; /* cd: req granted */ | |
0490e609 | 1007 | s4_rsp.dest_port = 0; /* ignored */ |
28b9cb4d | 1008 | s4_rsp.dest_addr.s_addr = INADDR_ANY; /* ignored */ |
15dd2c4f | 1009 | buffer_append(&c->output, &s4_rsp, sizeof(s4_rsp)); |
28b9cb4d | 1010 | return 1; |
0490e609 | 1011 | } |
1012 | ||
f49658f5 | 1013 | /* try to decode a socks5 header */ |
1014 | #define SSH_SOCKS5_AUTHDONE 0x1000 | |
1015 | #define SSH_SOCKS5_NOAUTH 0x00 | |
1016 | #define SSH_SOCKS5_IPV4 0x01 | |
1017 | #define SSH_SOCKS5_DOMAIN 0x03 | |
1018 | #define SSH_SOCKS5_IPV6 0x04 | |
1019 | #define SSH_SOCKS5_CONNECT 0x01 | |
1020 | #define SSH_SOCKS5_SUCCESS 0x00 | |
1021 | ||
ebb90778 | 1022 | /* ARGSUSED */ |
f49658f5 | 1023 | static int |
c8e9c167 | 1024 | channel_decode_socks5(Channel *c, fd_set *readset, fd_set *writeset) |
f49658f5 | 1025 | { |
1026 | struct { | |
1027 | u_int8_t version; | |
1028 | u_int8_t command; | |
1029 | u_int8_t reserved; | |
1030 | u_int8_t atyp; | |
1031 | } s5_req, s5_rsp; | |
1032 | u_int16_t dest_port; | |
1033 | u_char *p, dest_addr[255+1]; | |
a217e418 | 1034 | u_int have, need, i, found, nmethods, addrlen, af; |
f49658f5 | 1035 | |
1036 | debug2("channel %d: decode socks5", c->self); | |
1037 | p = buffer_ptr(&c->input); | |
1038 | if (p[0] != 0x05) | |
1039 | return -1; | |
1040 | have = buffer_len(&c->input); | |
1041 | if (!(c->flags & SSH_SOCKS5_AUTHDONE)) { | |
1042 | /* format: ver | nmethods | methods */ | |
aff51935 | 1043 | if (have < 2) |
f49658f5 | 1044 | return 0; |
1045 | nmethods = p[1]; | |
1046 | if (have < nmethods + 2) | |
1047 | return 0; | |
1048 | /* look for method: "NO AUTHENTICATION REQUIRED" */ | |
1049 | for (found = 0, i = 2 ; i < nmethods + 2; i++) { | |
1050 | if (p[i] == SSH_SOCKS5_NOAUTH ) { | |
1051 | found = 1; | |
1052 | break; | |
1053 | } | |
1054 | } | |
1055 | if (!found) { | |
1056 | debug("channel %d: method SSH_SOCKS5_NOAUTH not found", | |
1057 | c->self); | |
1058 | return -1; | |
1059 | } | |
1060 | buffer_consume(&c->input, nmethods + 2); | |
1061 | buffer_put_char(&c->output, 0x05); /* version */ | |
1062 | buffer_put_char(&c->output, SSH_SOCKS5_NOAUTH); /* method */ | |
1063 | FD_SET(c->sock, writeset); | |
1064 | c->flags |= SSH_SOCKS5_AUTHDONE; | |
1065 | debug2("channel %d: socks5 auth done", c->self); | |
1066 | return 0; /* need more */ | |
1067 | } | |
1068 | debug2("channel %d: socks5 post auth", c->self); | |
1069 | if (have < sizeof(s5_req)+1) | |
1070 | return 0; /* need more */ | |
5b5f6af7 | 1071 | memcpy(&s5_req, p, sizeof(s5_req)); |
f49658f5 | 1072 | if (s5_req.version != 0x05 || |
1073 | s5_req.command != SSH_SOCKS5_CONNECT || | |
1074 | s5_req.reserved != 0x00) { | |
d7ac5f18 | 1075 | debug2("channel %d: only socks5 connect supported", c->self); |
f49658f5 | 1076 | return -1; |
1077 | } | |
f8cc7664 | 1078 | switch (s5_req.atyp){ |
f49658f5 | 1079 | case SSH_SOCKS5_IPV4: |
1080 | addrlen = 4; | |
1081 | af = AF_INET; | |
1082 | break; | |
1083 | case SSH_SOCKS5_DOMAIN: | |
1084 | addrlen = p[sizeof(s5_req)]; | |
1085 | af = -1; | |
1086 | break; | |
1087 | case SSH_SOCKS5_IPV6: | |
1088 | addrlen = 16; | |
1089 | af = AF_INET6; | |
1090 | break; | |
1091 | default: | |
d7ac5f18 | 1092 | debug2("channel %d: bad socks5 atyp %d", c->self, s5_req.atyp); |
f49658f5 | 1093 | return -1; |
1094 | } | |
a217e418 | 1095 | need = sizeof(s5_req) + addrlen + 2; |
1096 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) | |
1097 | need++; | |
1098 | if (have < need) | |
f49658f5 | 1099 | return 0; |
1100 | buffer_consume(&c->input, sizeof(s5_req)); | |
1101 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) | |
1102 | buffer_consume(&c->input, 1); /* host string length */ | |
1103 | buffer_get(&c->input, (char *)&dest_addr, addrlen); | |
1104 | buffer_get(&c->input, (char *)&dest_port, 2); | |
1105 | dest_addr[addrlen] = '\0'; | |
1106 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) | |
f6be21a0 | 1107 | strlcpy(c->path, (char *)dest_addr, sizeof(c->path)); |
f49658f5 | 1108 | else if (inet_ntop(af, dest_addr, c->path, sizeof(c->path)) == NULL) |
1109 | return -1; | |
1110 | c->host_port = ntohs(dest_port); | |
b6453d99 | 1111 | |
d7ac5f18 | 1112 | debug2("channel %d: dynamic request: socks5 host %s port %u command %u", |
f49658f5 | 1113 | c->self, c->path, c->host_port, s5_req.command); |
1114 | ||
1115 | s5_rsp.version = 0x05; | |
1116 | s5_rsp.command = SSH_SOCKS5_SUCCESS; | |
1117 | s5_rsp.reserved = 0; /* ignored */ | |
1118 | s5_rsp.atyp = SSH_SOCKS5_IPV4; | |
1119 | ((struct in_addr *)&dest_addr)->s_addr = INADDR_ANY; | |
1120 | dest_port = 0; /* ignored */ | |
1121 | ||
15dd2c4f | 1122 | buffer_append(&c->output, &s5_rsp, sizeof(s5_rsp)); |
1123 | buffer_append(&c->output, &dest_addr, sizeof(struct in_addr)); | |
1124 | buffer_append(&c->output, &dest_port, sizeof(dest_port)); | |
f49658f5 | 1125 | return 1; |
1126 | } | |
1127 | ||
28b9cb4d | 1128 | /* dynamic port forwarding */ |
396c147e | 1129 | static void |
c8e9c167 | 1130 | channel_pre_dynamic(Channel *c, fd_set *readset, fd_set *writeset) |
28b9cb4d | 1131 | { |
1132 | u_char *p; | |
2ceb8101 | 1133 | u_int have; |
1134 | int ret; | |
28b9cb4d | 1135 | |
1136 | have = buffer_len(&c->input); | |
639cb8ab | 1137 | c->delayed = 0; |
28b9cb4d | 1138 | debug2("channel %d: pre_dynamic: have %d", c->self, have); |
070adba2 | 1139 | /* buffer_dump(&c->input); */ |
28b9cb4d | 1140 | /* check if the fixed size part of the packet is in buffer. */ |
f49658f5 | 1141 | if (have < 3) { |
28b9cb4d | 1142 | /* need more */ |
1143 | FD_SET(c->sock, readset); | |
1144 | return; | |
1145 | } | |
1146 | /* try to guess the protocol */ | |
1147 | p = buffer_ptr(&c->input); | |
1148 | switch (p[0]) { | |
6683b40f | 1149 | case 0x04: |
1150 | ret = channel_decode_socks4(c, readset, writeset); | |
1151 | break; | |
f49658f5 | 1152 | case 0x05: |
1153 | ret = channel_decode_socks5(c, readset, writeset); | |
1154 | break; | |
28b9cb4d | 1155 | default: |
1156 | ret = -1; | |
1157 | break; | |
1158 | } | |
1159 | if (ret < 0) { | |
719fc62f | 1160 | chan_mark_dead(c); |
28b9cb4d | 1161 | } else if (ret == 0) { |
1162 | debug2("channel %d: pre_dynamic: need more", c->self); | |
1163 | /* need more */ | |
1164 | FD_SET(c->sock, readset); | |
1165 | } else { | |
1166 | /* switch to the next state */ | |
1167 | c->type = SSH_CHANNEL_OPENING; | |
1168 | port_open_helper(c, "direct-tcpip"); | |
1169 | } | |
1170 | } | |
0490e609 | 1171 | |
7368a6c8 | 1172 | /* This is our fake X11 server socket. */ |
ebb90778 | 1173 | /* ARGSUSED */ |
396c147e | 1174 | static void |
c8e9c167 | 1175 | channel_post_x11_listener(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1176 | { |
719fc62f | 1177 | Channel *nc; |
7368a6c8 | 1178 | struct sockaddr addr; |
bcc0381e | 1179 | int newsock; |
7368a6c8 | 1180 | socklen_t addrlen; |
865ac82e | 1181 | char buf[16384], *remote_ipaddr; |
0b242b12 | 1182 | int remote_port; |
7368a6c8 | 1183 | |
1184 | if (FD_ISSET(c->sock, readset)) { | |
1185 | debug("X11 connection requested."); | |
1186 | addrlen = sizeof(addr); | |
1187 | newsock = accept(c->sock, &addr, &addrlen); | |
ac151b18 | 1188 | if (c->single_connection) { |
d7ac5f18 | 1189 | debug2("single_connection: closing X11 listener."); |
ac151b18 | 1190 | channel_close_fd(&c->sock); |
1191 | chan_mark_dead(c); | |
1192 | } | |
7368a6c8 | 1193 | if (newsock < 0) { |
1194 | error("accept: %.100s", strerror(errno)); | |
1195 | return; | |
5260325f | 1196 | } |
bcc0381e | 1197 | set_nodelay(newsock); |
865ac82e | 1198 | remote_ipaddr = get_peer_ipaddr(newsock); |
0b242b12 | 1199 | remote_port = get_peer_port(newsock); |
7368a6c8 | 1200 | snprintf(buf, sizeof buf, "X11 connection from %.200s port %d", |
865ac82e | 1201 | remote_ipaddr, remote_port); |
0b242b12 | 1202 | |
719fc62f | 1203 | nc = channel_new("accepted x11 socket", |
0b242b12 | 1204 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
0d942eff | 1205 | c->local_window_max, c->local_maxpacket, 0, buf, 1); |
0b242b12 | 1206 | if (compat20) { |
1207 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1208 | packet_put_cstring("x11"); | |
719fc62f | 1209 | packet_put_int(nc->self); |
ac151b18 | 1210 | packet_put_int(nc->local_window_max); |
1211 | packet_put_int(nc->local_maxpacket); | |
865ac82e | 1212 | /* originator ipaddr and port */ |
1213 | packet_put_cstring(remote_ipaddr); | |
d0c832f3 | 1214 | if (datafellows & SSH_BUG_X11FWD) { |
d7ac5f18 | 1215 | debug2("ssh2 x11 bug compat mode"); |
d0c832f3 | 1216 | } else { |
1217 | packet_put_int(remote_port); | |
1218 | } | |
0b242b12 | 1219 | packet_send(); |
1220 | } else { | |
1221 | packet_start(SSH_SMSG_X11_OPEN); | |
719fc62f | 1222 | packet_put_int(nc->self); |
8e7895b8 | 1223 | if (packet_get_protocol_flags() & |
1224 | SSH_PROTOFLAG_HOST_IN_FWD_OPEN) | |
449c5ba5 | 1225 | packet_put_cstring(buf); |
0b242b12 | 1226 | packet_send(); |
1227 | } | |
865ac82e | 1228 | xfree(remote_ipaddr); |
8efc0c15 | 1229 | } |
8efc0c15 | 1230 | } |
1231 | ||
396c147e | 1232 | static void |
0490e609 | 1233 | port_open_helper(Channel *c, char *rtype) |
1234 | { | |
1235 | int direct; | |
1236 | char buf[1024]; | |
1237 | char *remote_ipaddr = get_peer_ipaddr(c->sock); | |
29798ed0 | 1238 | int remote_port = get_peer_port(c->sock); |
0490e609 | 1239 | |
1240 | direct = (strcmp(rtype, "direct-tcpip") == 0); | |
1241 | ||
1242 | snprintf(buf, sizeof buf, | |
1243 | "%s: listening port %d for %.100s port %d, " | |
1244 | "connect from %.200s port %d", | |
1245 | rtype, c->listening_port, c->path, c->host_port, | |
1246 | remote_ipaddr, remote_port); | |
1247 | ||
1248 | xfree(c->remote_name); | |
1249 | c->remote_name = xstrdup(buf); | |
1250 | ||
1251 | if (compat20) { | |
1252 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1253 | packet_put_cstring(rtype); | |
1254 | packet_put_int(c->self); | |
1255 | packet_put_int(c->local_window_max); | |
1256 | packet_put_int(c->local_maxpacket); | |
1257 | if (direct) { | |
1258 | /* target host, port */ | |
1259 | packet_put_cstring(c->path); | |
1260 | packet_put_int(c->host_port); | |
1261 | } else { | |
1262 | /* listen address, port */ | |
1263 | packet_put_cstring(c->path); | |
1264 | packet_put_int(c->listening_port); | |
1265 | } | |
1266 | /* originator host and port */ | |
1267 | packet_put_cstring(remote_ipaddr); | |
29798ed0 | 1268 | packet_put_int((u_int)remote_port); |
0490e609 | 1269 | packet_send(); |
1270 | } else { | |
1271 | packet_start(SSH_MSG_PORT_OPEN); | |
1272 | packet_put_int(c->self); | |
1273 | packet_put_cstring(c->path); | |
1274 | packet_put_int(c->host_port); | |
8e7895b8 | 1275 | if (packet_get_protocol_flags() & |
1276 | SSH_PROTOFLAG_HOST_IN_FWD_OPEN) | |
0490e609 | 1277 | packet_put_cstring(c->remote_name); |
1278 | packet_send(); | |
1279 | } | |
1280 | xfree(remote_ipaddr); | |
1281 | } | |
1282 | ||
442aee3a | 1283 | static void |
1284 | channel_set_reuseaddr(int fd) | |
1285 | { | |
1286 | int on = 1; | |
1287 | ||
1288 | /* | |
1289 | * Set socket options. | |
1290 | * Allow local port reuse in TIME_WAIT. | |
1291 | */ | |
1292 | if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1) | |
1293 | error("setsockopt SO_REUSEADDR fd %d: %s", fd, strerror(errno)); | |
1294 | } | |
1295 | ||
aa3378df | 1296 | /* |
7368a6c8 | 1297 | * This socket is listening for connections to a forwarded TCP/IP port. |
aa3378df | 1298 | */ |
ebb90778 | 1299 | /* ARGSUSED */ |
396c147e | 1300 | static void |
c8e9c167 | 1301 | channel_post_port_listener(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1302 | { |
0490e609 | 1303 | Channel *nc; |
7368a6c8 | 1304 | struct sockaddr addr; |
719fc62f | 1305 | int newsock, nextstate; |
7368a6c8 | 1306 | socklen_t addrlen; |
0490e609 | 1307 | char *rtype; |
fa08c86b | 1308 | |
7368a6c8 | 1309 | if (FD_ISSET(c->sock, readset)) { |
1310 | debug("Connection to port %d forwarding " | |
1311 | "to %.100s port %d requested.", | |
1312 | c->listening_port, c->path, c->host_port); | |
0490e609 | 1313 | |
639cb8ab | 1314 | if (c->type == SSH_CHANNEL_RPORT_LISTENER) { |
1315 | nextstate = SSH_CHANNEL_OPENING; | |
1316 | rtype = "forwarded-tcpip"; | |
1317 | } else { | |
1318 | if (c->host_port == 0) { | |
1319 | nextstate = SSH_CHANNEL_DYNAMIC; | |
f3964cb9 | 1320 | rtype = "dynamic-tcpip"; |
639cb8ab | 1321 | } else { |
1322 | nextstate = SSH_CHANNEL_OPENING; | |
1323 | rtype = "direct-tcpip"; | |
1324 | } | |
1325 | } | |
0490e609 | 1326 | |
7368a6c8 | 1327 | addrlen = sizeof(addr); |
1328 | newsock = accept(c->sock, &addr, &addrlen); | |
1329 | if (newsock < 0) { | |
1330 | error("accept: %.100s", strerror(errno)); | |
1331 | return; | |
1332 | } | |
811a6342 | 1333 | set_nodelay(newsock); |
0d942eff | 1334 | nc = channel_new(rtype, nextstate, newsock, newsock, -1, |
1335 | c->local_window_max, c->local_maxpacket, 0, rtype, 1); | |
0490e609 | 1336 | nc->listening_port = c->listening_port; |
1337 | nc->host_port = c->host_port; | |
1338 | strlcpy(nc->path, c->path, sizeof(nc->path)); | |
1339 | ||
639cb8ab | 1340 | if (nextstate == SSH_CHANNEL_DYNAMIC) { |
1341 | /* | |
1342 | * do not call the channel_post handler until | |
1343 | * this flag has been reset by a pre-handler. | |
1344 | * otherwise the FD_ISSET calls might overflow | |
1345 | */ | |
1346 | nc->delayed = 1; | |
1347 | } else { | |
0490e609 | 1348 | port_open_helper(nc, rtype); |
639cb8ab | 1349 | } |
7368a6c8 | 1350 | } |
1351 | } | |
8efc0c15 | 1352 | |
7368a6c8 | 1353 | /* |
1354 | * This is the authentication agent socket listening for connections from | |
1355 | * clients. | |
1356 | */ | |
ebb90778 | 1357 | /* ARGSUSED */ |
396c147e | 1358 | static void |
c8e9c167 | 1359 | channel_post_auth_listener(Channel *c, fd_set *readset, fd_set *writeset) |
8efc0c15 | 1360 | { |
719fc62f | 1361 | Channel *nc; |
1362 | int newsock; | |
5260325f | 1363 | struct sockaddr addr; |
48e671d5 | 1364 | socklen_t addrlen; |
5260325f | 1365 | |
7368a6c8 | 1366 | if (FD_ISSET(c->sock, readset)) { |
1367 | addrlen = sizeof(addr); | |
1368 | newsock = accept(c->sock, &addr, &addrlen); | |
1369 | if (newsock < 0) { | |
1370 | error("accept from auth socket: %.100s", strerror(errno)); | |
1371 | return; | |
1372 | } | |
719fc62f | 1373 | nc = channel_new("accepted auth socket", |
fa08c86b | 1374 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
1375 | c->local_window_max, c->local_maxpacket, | |
0d942eff | 1376 | 0, "accepted auth socket", 1); |
fa08c86b | 1377 | if (compat20) { |
1378 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1379 | packet_put_cstring("auth-agent@openssh.com"); | |
719fc62f | 1380 | packet_put_int(nc->self); |
fa08c86b | 1381 | packet_put_int(c->local_window_max); |
1382 | packet_put_int(c->local_maxpacket); | |
1383 | } else { | |
1384 | packet_start(SSH_SMSG_AGENT_OPEN); | |
719fc62f | 1385 | packet_put_int(nc->self); |
fa08c86b | 1386 | } |
7368a6c8 | 1387 | packet_send(); |
1388 | } | |
1389 | } | |
5260325f | 1390 | |
ebb90778 | 1391 | /* ARGSUSED */ |
396c147e | 1392 | static void |
c8e9c167 | 1393 | channel_post_connecting(Channel *c, fd_set *readset, fd_set *writeset) |
97fb6912 | 1394 | { |
d18e0850 | 1395 | int err = 0; |
8ab2cb35 | 1396 | socklen_t sz = sizeof(err); |
d18e0850 | 1397 | |
97fb6912 | 1398 | if (FD_ISSET(c->sock, writeset)) { |
db518d9b | 1399 | if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, &err, &sz) < 0) { |
d18e0850 | 1400 | err = errno; |
1401 | error("getsockopt SO_ERROR failed"); | |
1402 | } | |
1403 | if (err == 0) { | |
1404 | debug("channel %d: connected", c->self); | |
1405 | c->type = SSH_CHANNEL_OPEN; | |
1406 | if (compat20) { | |
1407 | packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1408 | packet_put_int(c->remote_id); | |
1409 | packet_put_int(c->self); | |
1410 | packet_put_int(c->local_window); | |
1411 | packet_put_int(c->local_maxpacket); | |
1412 | } else { | |
1413 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1414 | packet_put_int(c->remote_id); | |
1415 | packet_put_int(c->self); | |
1416 | } | |
97fb6912 | 1417 | } else { |
d18e0850 | 1418 | debug("channel %d: not connected: %s", |
1419 | c->self, strerror(err)); | |
1420 | if (compat20) { | |
1421 | packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); | |
1422 | packet_put_int(c->remote_id); | |
1423 | packet_put_int(SSH2_OPEN_CONNECT_FAILED); | |
1424 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { | |
1425 | packet_put_cstring(strerror(err)); | |
1426 | packet_put_cstring(""); | |
1427 | } | |
97fb6912 | 1428 | } else { |
d18e0850 | 1429 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
1430 | packet_put_int(c->remote_id); | |
97fb6912 | 1431 | } |
d18e0850 | 1432 | chan_mark_dead(c); |
97fb6912 | 1433 | } |
d18e0850 | 1434 | packet_send(); |
97fb6912 | 1435 | } |
1436 | } | |
1437 | ||
ebb90778 | 1438 | /* ARGSUSED */ |
396c147e | 1439 | static int |
c8e9c167 | 1440 | channel_handle_rfd(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1441 | { |
fa1d7d85 | 1442 | char buf[CHAN_RBUF]; |
7368a6c8 | 1443 | int len; |
1444 | ||
6fd8622b | 1445 | if (c->rfd != -1 && |
7368a6c8 | 1446 | FD_ISSET(c->rfd, readset)) { |
ea8c44d9 | 1447 | errno = 0; |
7368a6c8 | 1448 | len = read(c->rfd, buf, sizeof(buf)); |
0fbe8c74 | 1449 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
1450 | return 1; | |
ea8c44d9 | 1451 | #ifndef PTY_ZEROREAD |
7368a6c8 | 1452 | if (len <= 0) { |
ea8c44d9 | 1453 | #else |
9c04d67d | 1454 | if ((!c->isatty && len <= 0) || |
1455 | (c->isatty && (len < 0 || (len == 0 && errno != 0)))) { | |
ea8c44d9 | 1456 | #endif |
d7ac5f18 | 1457 | debug2("channel %d: read<=0 rfd %d len %d", |
7368a6c8 | 1458 | c->self, c->rfd, len); |
28b9cb4d | 1459 | if (c->type != SSH_CHANNEL_OPEN) { |
d7ac5f18 | 1460 | debug2("channel %d: not open", c->self); |
719fc62f | 1461 | chan_mark_dead(c); |
0490e609 | 1462 | return -1; |
28b9cb4d | 1463 | } else if (compat13) { |
9c50edcf | 1464 | buffer_clear(&c->output); |
7368a6c8 | 1465 | c->type = SSH_CHANNEL_INPUT_DRAINING; |
d7ac5f18 | 1466 | debug2("channel %d: input draining.", c->self); |
7368a6c8 | 1467 | } else { |
1468 | chan_read_failed(c); | |
5260325f | 1469 | } |
7368a6c8 | 1470 | return -1; |
1471 | } | |
6aacefa7 | 1472 | if (c->input_filter != NULL) { |
2e73a022 | 1473 | if (c->input_filter(c, buf, len) == -1) { |
d7ac5f18 | 1474 | debug2("channel %d: filter stops", c->self); |
2e73a022 | 1475 | chan_read_failed(c); |
1476 | } | |
d20f3c9e | 1477 | } else if (c->datagram) { |
1478 | buffer_put_string(&c->input, buf, len); | |
2e73a022 | 1479 | } else { |
1480 | buffer_append(&c->input, buf, len); | |
1481 | } | |
7368a6c8 | 1482 | } |
1483 | return 1; | |
1484 | } | |
a7137f6b | 1485 | |
ebb90778 | 1486 | /* ARGSUSED */ |
396c147e | 1487 | static int |
c8e9c167 | 1488 | channel_handle_wfd(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1489 | { |
95ce5599 | 1490 | struct termios tio; |
c1c6a032 | 1491 | u_char *data = NULL, *buf; |
780a9951 | 1492 | u_int dlen; |
7368a6c8 | 1493 | int len; |
1494 | ||
1495 | /* Send buffered output data to the socket. */ | |
6fd8622b | 1496 | if (c->wfd != -1 && |
7368a6c8 | 1497 | FD_ISSET(c->wfd, writeset) && |
1498 | buffer_len(&c->output) > 0) { | |
c1c6a032 | 1499 | if (c->output_filter != NULL) { |
1500 | if ((buf = c->output_filter(c, &data, &dlen)) == NULL) { | |
1501 | debug2("channel %d: filter stops", c->self); | |
d7b37427 | 1502 | if (c->type != SSH_CHANNEL_OPEN) |
1503 | chan_mark_dead(c); | |
1504 | else | |
1505 | chan_write_failed(c); | |
1506 | return -1; | |
c1c6a032 | 1507 | } |
1508 | } else if (c->datagram) { | |
1509 | buf = data = buffer_get_string(&c->output, &dlen); | |
1510 | } else { | |
1511 | buf = data = buffer_ptr(&c->output); | |
1512 | dlen = buffer_len(&c->output); | |
1513 | } | |
1514 | ||
d20f3c9e | 1515 | if (c->datagram) { |
d20f3c9e | 1516 | /* ignore truncated writes, datagrams might get lost */ |
1517 | c->local_consumed += dlen + 4; | |
c1c6a032 | 1518 | len = write(c->wfd, buf, dlen); |
d20f3c9e | 1519 | xfree(data); |
1520 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) | |
1521 | return 1; | |
1522 | if (len <= 0) { | |
1523 | if (c->type != SSH_CHANNEL_OPEN) | |
1524 | chan_mark_dead(c); | |
1525 | else | |
1526 | chan_write_failed(c); | |
1527 | return -1; | |
1528 | } | |
1529 | return 1; | |
1530 | } | |
64c0ce80 | 1531 | #ifdef _AIX |
aff51935 | 1532 | /* XXX: Later AIX versions can't push as much data to tty */ |
7fbb4189 | 1533 | if (compat20 && c->wfd_isatty) |
1534 | dlen = MIN(dlen, 8*1024); | |
64c0ce80 | 1535 | #endif |
c1c6a032 | 1536 | |
1537 | len = write(c->wfd, buf, dlen); | |
0fbe8c74 | 1538 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
1539 | return 1; | |
7368a6c8 | 1540 | if (len <= 0) { |
28b9cb4d | 1541 | if (c->type != SSH_CHANNEL_OPEN) { |
d7ac5f18 | 1542 | debug2("channel %d: not open", c->self); |
719fc62f | 1543 | chan_mark_dead(c); |
28b9cb4d | 1544 | return -1; |
1545 | } else if (compat13) { | |
9c50edcf | 1546 | buffer_clear(&c->output); |
d7ac5f18 | 1547 | debug2("channel %d: input draining.", c->self); |
7368a6c8 | 1548 | c->type = SSH_CHANNEL_INPUT_DRAINING; |
1549 | } else { | |
1550 | chan_write_failed(c); | |
5260325f | 1551 | } |
7368a6c8 | 1552 | return -1; |
1553 | } | |
c1c6a032 | 1554 | if (compat20 && c->isatty && dlen >= 1 && buf[0] != '\r') { |
0ae4fe1d | 1555 | if (tcgetattr(c->wfd, &tio) == 0 && |
1556 | !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) { | |
1557 | /* | |
1558 | * Simulate echo to reduce the impact of | |
355724fc | 1559 | * traffic analysis. We need to match the |
95ce5599 | 1560 | * size of a SSH2_MSG_CHANNEL_DATA message |
c1c6a032 | 1561 | * (4 byte channel id + buf) |
0ae4fe1d | 1562 | */ |
95ce5599 | 1563 | packet_send_ignore(4 + len); |
0ae4fe1d | 1564 | packet_send(); |
0ae4fe1d | 1565 | } |
1566 | } | |
7368a6c8 | 1567 | buffer_consume(&c->output, len); |
7e7327a1 | 1568 | if (compat20 && len > 0) { |
1569 | c->local_consumed += len; | |
1570 | } | |
1571 | } | |
1572 | return 1; | |
1573 | } | |
a7137f6b | 1574 | |
396c147e | 1575 | static int |
c8e9c167 | 1576 | channel_handle_efd(Channel *c, fd_set *readset, fd_set *writeset) |
7e7327a1 | 1577 | { |
fa1d7d85 | 1578 | char buf[CHAN_RBUF]; |
7e7327a1 | 1579 | int len; |
1580 | ||
8ce64345 | 1581 | /** XXX handle drain efd, too */ |
7e7327a1 | 1582 | if (c->efd != -1) { |
1583 | if (c->extended_usage == CHAN_EXTENDED_WRITE && | |
1584 | FD_ISSET(c->efd, writeset) && | |
1585 | buffer_len(&c->extended) > 0) { | |
1586 | len = write(c->efd, buffer_ptr(&c->extended), | |
1587 | buffer_len(&c->extended)); | |
de273eef | 1588 | debug2("channel %d: written %d to efd %d", |
7e7327a1 | 1589 | c->self, len, c->efd); |
ee55dacf | 1590 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
1591 | return 1; | |
1592 | if (len <= 0) { | |
1593 | debug2("channel %d: closing write-efd %d", | |
1594 | c->self, c->efd); | |
489aa2e9 | 1595 | channel_close_fd(&c->efd); |
ee55dacf | 1596 | } else { |
7e7327a1 | 1597 | buffer_consume(&c->extended, len); |
1598 | c->local_consumed += len; | |
1599 | } | |
1600 | } else if (c->extended_usage == CHAN_EXTENDED_READ && | |
1601 | FD_ISSET(c->efd, readset)) { | |
1602 | len = read(c->efd, buf, sizeof(buf)); | |
de273eef | 1603 | debug2("channel %d: read %d from efd %d", |
184eed6a | 1604 | c->self, len, c->efd); |
ee55dacf | 1605 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
1606 | return 1; | |
1607 | if (len <= 0) { | |
1608 | debug2("channel %d: closing read-efd %d", | |
8ce64345 | 1609 | c->self, c->efd); |
489aa2e9 | 1610 | channel_close_fd(&c->efd); |
ee55dacf | 1611 | } else { |
7e7327a1 | 1612 | buffer_append(&c->extended, buf, len); |
ee55dacf | 1613 | } |
7e7327a1 | 1614 | } |
1615 | } | |
1616 | return 1; | |
1617 | } | |
a7137f6b | 1618 | |
ebb90778 | 1619 | /* ARGSUSED */ |
396c147e | 1620 | static int |
c8e9c167 | 1621 | channel_handle_ctl(Channel *c, fd_set *readset, fd_set *writeset) |
5e96b616 | 1622 | { |
1623 | char buf[16]; | |
1624 | int len; | |
1625 | ||
1626 | /* Monitor control fd to detect if the slave client exits */ | |
1627 | if (c->ctl_fd != -1 && FD_ISSET(c->ctl_fd, readset)) { | |
1628 | len = read(c->ctl_fd, buf, sizeof(buf)); | |
1629 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) | |
1630 | return 1; | |
1631 | if (len <= 0) { | |
1632 | debug2("channel %d: ctl read<=0", c->self); | |
1633 | if (c->type != SSH_CHANNEL_OPEN) { | |
1634 | debug2("channel %d: not open", c->self); | |
1635 | chan_mark_dead(c); | |
1636 | return -1; | |
1637 | } else { | |
1638 | chan_read_failed(c); | |
1639 | chan_write_failed(c); | |
1640 | } | |
1641 | return -1; | |
1642 | } else | |
1643 | fatal("%s: unexpected data on ctl fd", __func__); | |
1644 | } | |
1645 | return 1; | |
1646 | } | |
a7137f6b | 1647 | |
5e96b616 | 1648 | static int |
ee55dacf | 1649 | channel_check_window(Channel *c) |
7e7327a1 | 1650 | { |
28b9cb4d | 1651 | if (c->type == SSH_CHANNEL_OPEN && |
1652 | !(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) && | |
7e7327a1 | 1653 | c->local_window < c->local_window_max/2 && |
1654 | c->local_consumed > 0) { | |
1655 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); | |
1656 | packet_put_int(c->remote_id); | |
1657 | packet_put_int(c->local_consumed); | |
1658 | packet_send(); | |
de273eef | 1659 | debug2("channel %d: window %d sent adjust %d", |
7e7327a1 | 1660 | c->self, c->local_window, |
1661 | c->local_consumed); | |
1662 | c->local_window += c->local_consumed; | |
1663 | c->local_consumed = 0; | |
7368a6c8 | 1664 | } |
1665 | return 1; | |
1666 | } | |
5260325f | 1667 | |
396c147e | 1668 | static void |
c8e9c167 | 1669 | channel_post_open(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1670 | { |
639cb8ab | 1671 | if (c->delayed) |
1672 | return; | |
7368a6c8 | 1673 | channel_handle_rfd(c, readset, writeset); |
1674 | channel_handle_wfd(c, readset, writeset); | |
0c0738d5 | 1675 | if (!compat20) |
639cb8ab | 1676 | return; |
7e7327a1 | 1677 | channel_handle_efd(c, readset, writeset); |
5e96b616 | 1678 | channel_handle_ctl(c, readset, writeset); |
ee55dacf | 1679 | channel_check_window(c); |
7e7327a1 | 1680 | } |
1681 | ||
ebb90778 | 1682 | /* ARGSUSED */ |
396c147e | 1683 | static void |
c8e9c167 | 1684 | channel_post_output_drain_13(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1685 | { |
1686 | int len; | |
e1feb9bf | 1687 | |
7368a6c8 | 1688 | /* Send buffered output data to the socket. */ |
1689 | if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) { | |
1690 | len = write(c->sock, buffer_ptr(&c->output), | |
1691 | buffer_len(&c->output)); | |
1692 | if (len <= 0) | |
9c50edcf | 1693 | buffer_clear(&c->output); |
7368a6c8 | 1694 | else |
1695 | buffer_consume(&c->output, len); | |
1696 | } | |
1697 | } | |
5260325f | 1698 | |
396c147e | 1699 | static void |
7e7327a1 | 1700 | channel_handler_init_20(void) |
1701 | { | |
0c0738d5 | 1702 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open; |
0b242b12 | 1703 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
7e7327a1 | 1704 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; |
fa08c86b | 1705 | channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener; |
0b242b12 | 1706 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
fa08c86b | 1707 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; |
97fb6912 | 1708 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1709 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7e7327a1 | 1710 | |
0c0738d5 | 1711 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
7e7327a1 | 1712 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; |
fa08c86b | 1713 | channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener; |
0b242b12 | 1714 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
fa08c86b | 1715 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; |
97fb6912 | 1716 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 1717 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
7e7327a1 | 1718 | } |
1719 | ||
396c147e | 1720 | static void |
7368a6c8 | 1721 | channel_handler_init_13(void) |
1722 | { | |
1723 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13; | |
1724 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_13; | |
1725 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; | |
1726 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; | |
1727 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; | |
1728 | channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining; | |
1729 | channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining; | |
97fb6912 | 1730 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1731 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7368a6c8 | 1732 | |
0c0738d5 | 1733 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
7368a6c8 | 1734 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
1735 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; | |
1736 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; | |
1737 | channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13; | |
97fb6912 | 1738 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 1739 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
7368a6c8 | 1740 | } |
5260325f | 1741 | |
396c147e | 1742 | static void |
7368a6c8 | 1743 | channel_handler_init_15(void) |
1744 | { | |
0c0738d5 | 1745 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open; |
0b242b12 | 1746 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
7368a6c8 | 1747 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
1748 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; | |
1749 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; | |
97fb6912 | 1750 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1751 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7368a6c8 | 1752 | |
1753 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; | |
1754 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; | |
1755 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; | |
0c0738d5 | 1756 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
97fb6912 | 1757 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 1758 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
7368a6c8 | 1759 | } |
1760 | ||
396c147e | 1761 | static void |
7368a6c8 | 1762 | channel_handler_init(void) |
1763 | { | |
1764 | int i; | |
e1feb9bf | 1765 | |
184eed6a | 1766 | for (i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) { |
7368a6c8 | 1767 | channel_pre[i] = NULL; |
1768 | channel_post[i] = NULL; | |
1769 | } | |
7e7327a1 | 1770 | if (compat20) |
1771 | channel_handler_init_20(); | |
1772 | else if (compat13) | |
7368a6c8 | 1773 | channel_handler_init_13(); |
1774 | else | |
1775 | channel_handler_init_15(); | |
1776 | } | |
1777 | ||
418e724c | 1778 | /* gc dead channels */ |
1779 | static void | |
1780 | channel_garbage_collect(Channel *c) | |
1781 | { | |
1782 | if (c == NULL) | |
1783 | return; | |
1784 | if (c->detach_user != NULL) { | |
8cd0437d | 1785 | if (!chan_is_dead(c, c->detach_close)) |
418e724c | 1786 | return; |
d7ac5f18 | 1787 | debug2("channel %d: gc: notify user", c->self); |
418e724c | 1788 | c->detach_user(c->self, NULL); |
1789 | /* if we still have a callback */ | |
1790 | if (c->detach_user != NULL) | |
1791 | return; | |
d7ac5f18 | 1792 | debug2("channel %d: gc: user detached", c->self); |
418e724c | 1793 | } |
1794 | if (!chan_is_dead(c, 1)) | |
1795 | return; | |
d7ac5f18 | 1796 | debug2("channel %d: garbage collecting", c->self); |
418e724c | 1797 | channel_free(c); |
1798 | } | |
1799 | ||
396c147e | 1800 | static void |
c8e9c167 | 1801 | channel_handler(chan_fn *ftab[], fd_set *readset, fd_set *writeset) |
7368a6c8 | 1802 | { |
1803 | static int did_init = 0; | |
9a995072 | 1804 | u_int i; |
7368a6c8 | 1805 | Channel *c; |
1806 | ||
1807 | if (!did_init) { | |
1808 | channel_handler_init(); | |
1809 | did_init = 1; | |
1810 | } | |
1811 | for (i = 0; i < channels_alloc; i++) { | |
719fc62f | 1812 | c = channels[i]; |
1813 | if (c == NULL) | |
5260325f | 1814 | continue; |
6fd8622b | 1815 | if (ftab[c->type] != NULL) |
1816 | (*ftab[c->type])(c, readset, writeset); | |
418e724c | 1817 | channel_garbage_collect(c); |
8efc0c15 | 1818 | } |
8efc0c15 | 1819 | } |
1820 | ||
8e7895b8 | 1821 | /* |
1822 | * Allocate/update select bitmasks and add any bits relevant to channels in | |
1823 | * select bitmasks. | |
1824 | */ | |
6ae2364d | 1825 | void |
c422989b | 1826 | channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp, |
9a995072 | 1827 | u_int *nallocp, int rekeying) |
7368a6c8 | 1828 | { |
c5d10563 | 1829 | u_int n, sz, nfdset; |
39929cdb | 1830 | |
1831 | n = MAX(*maxfdp, channel_max_fd); | |
1832 | ||
c5d10563 | 1833 | nfdset = howmany(n+1, NFDBITS); |
1834 | /* Explicitly test here, because xrealloc isn't always called */ | |
1835 | if (nfdset && SIZE_T_MAX / nfdset < sizeof(fd_mask)) | |
1836 | fatal("channel_prepare_select: max_fd (%d) is too large", n); | |
1837 | sz = nfdset * sizeof(fd_mask); | |
1838 | ||
489aa2e9 | 1839 | /* perhaps check sz < nalloc/2 and shrink? */ |
1840 | if (*readsetp == NULL || sz > *nallocp) { | |
c5d10563 | 1841 | *readsetp = xrealloc(*readsetp, nfdset, sizeof(fd_mask)); |
1842 | *writesetp = xrealloc(*writesetp, nfdset, sizeof(fd_mask)); | |
489aa2e9 | 1843 | *nallocp = sz; |
39929cdb | 1844 | } |
489aa2e9 | 1845 | *maxfdp = n; |
39929cdb | 1846 | memset(*readsetp, 0, sz); |
1847 | memset(*writesetp, 0, sz); | |
1848 | ||
c422989b | 1849 | if (!rekeying) |
1850 | channel_handler(channel_pre, *readsetp, *writesetp); | |
7368a6c8 | 1851 | } |
1852 | ||
8e7895b8 | 1853 | /* |
1854 | * After select, perform any appropriate operations for channels which have | |
1855 | * events pending. | |
1856 | */ | |
6ae2364d | 1857 | void |
c8e9c167 | 1858 | channel_after_select(fd_set *readset, fd_set *writeset) |
7368a6c8 | 1859 | { |
1860 | channel_handler(channel_post, readset, writeset); | |
1861 | } | |
1862 | ||
8e7895b8 | 1863 | |
39929cdb | 1864 | /* If there is data to send to the connection, enqueue some of it now. */ |
6ae2364d | 1865 | void |
d5bb9418 | 1866 | channel_output_poll(void) |
8efc0c15 | 1867 | { |
7368a6c8 | 1868 | Channel *c; |
9a995072 | 1869 | u_int i, len; |
5260325f | 1870 | |
1871 | for (i = 0; i < channels_alloc; i++) { | |
719fc62f | 1872 | c = channels[i]; |
1873 | if (c == NULL) | |
1874 | continue; | |
48e671d5 | 1875 | |
8e7895b8 | 1876 | /* |
1877 | * We are only interested in channels that can have buffered | |
1878 | * incoming data. | |
1879 | */ | |
48e671d5 | 1880 | if (compat13) { |
7368a6c8 | 1881 | if (c->type != SSH_CHANNEL_OPEN && |
1882 | c->type != SSH_CHANNEL_INPUT_DRAINING) | |
48e671d5 | 1883 | continue; |
1884 | } else { | |
7368a6c8 | 1885 | if (c->type != SSH_CHANNEL_OPEN) |
48e671d5 | 1886 | continue; |
48e671d5 | 1887 | } |
e78a59f5 | 1888 | if (compat20 && |
1889 | (c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) { | |
ee55dacf | 1890 | /* XXX is this true? */ |
418e724c | 1891 | debug3("channel %d: will not send data after close", c->self); |
7e7327a1 | 1892 | continue; |
1893 | } | |
5260325f | 1894 | |
1895 | /* Get the amount of buffered data for this channel. */ | |
ee55dacf | 1896 | if ((c->istate == CHAN_INPUT_OPEN || |
1897 | c->istate == CHAN_INPUT_WAIT_DRAIN) && | |
1898 | (len = buffer_len(&c->input)) > 0) { | |
d20f3c9e | 1899 | if (c->datagram) { |
1900 | if (len > 0) { | |
1901 | u_char *data; | |
1902 | u_int dlen; | |
1903 | ||
1904 | data = buffer_get_string(&c->input, | |
1905 | &dlen); | |
1906 | packet_start(SSH2_MSG_CHANNEL_DATA); | |
1907 | packet_put_int(c->remote_id); | |
1908 | packet_put_string(data, dlen); | |
1909 | packet_send(); | |
1910 | c->remote_window -= dlen + 4; | |
1911 | xfree(data); | |
1912 | } | |
1913 | continue; | |
1914 | } | |
8e7895b8 | 1915 | /* |
1916 | * Send some data for the other side over the secure | |
1917 | * connection. | |
1918 | */ | |
7e7327a1 | 1919 | if (compat20) { |
1920 | if (len > c->remote_window) | |
1921 | len = c->remote_window; | |
1922 | if (len > c->remote_maxpacket) | |
1923 | len = c->remote_maxpacket; | |
5260325f | 1924 | } else { |
7e7327a1 | 1925 | if (packet_is_interactive()) { |
1926 | if (len > 1024) | |
1927 | len = 512; | |
1928 | } else { | |
1929 | /* Keep the packets at reasonable size. */ | |
1930 | if (len > packet_get_maxsize()/2) | |
1931 | len = packet_get_maxsize()/2; | |
1932 | } | |
5260325f | 1933 | } |
7368a6c8 | 1934 | if (len > 0) { |
7e7327a1 | 1935 | packet_start(compat20 ? |
1936 | SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA); | |
7368a6c8 | 1937 | packet_put_int(c->remote_id); |
1938 | packet_put_string(buffer_ptr(&c->input), len); | |
1939 | packet_send(); | |
1940 | buffer_consume(&c->input, len); | |
1941 | c->remote_window -= len; | |
7368a6c8 | 1942 | } |
1943 | } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) { | |
5260325f | 1944 | if (compat13) |
1945 | fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3"); | |
aa3378df | 1946 | /* |
1947 | * input-buffer is empty and read-socket shutdown: | |
d2296ed7 | 1948 | * tell peer, that we will not send more data: send IEOF. |
1949 | * hack for extended data: delay EOF if EFD still in use. | |
aa3378df | 1950 | */ |
d2296ed7 | 1951 | if (CHANNEL_EFD_INPUT_ACTIVE(c)) |
4e2e5cfd | 1952 | debug2("channel %d: ibuf_empty delayed efd %d/(%d)", |
1953 | c->self, c->efd, buffer_len(&c->extended)); | |
d2296ed7 | 1954 | else |
1955 | chan_ibuf_empty(c); | |
5260325f | 1956 | } |
7e7327a1 | 1957 | /* Send extended data, i.e. stderr */ |
1958 | if (compat20 && | |
d2296ed7 | 1959 | !(c->flags & CHAN_EOF_SENT) && |
7e7327a1 | 1960 | c->remote_window > 0 && |
1961 | (len = buffer_len(&c->extended)) > 0 && | |
1962 | c->extended_usage == CHAN_EXTENDED_READ) { | |
f91d9a89 | 1963 | debug2("channel %d: rwin %u elen %u euse %d", |
ee55dacf | 1964 | c->self, c->remote_window, buffer_len(&c->extended), |
1965 | c->extended_usage); | |
7e7327a1 | 1966 | if (len > c->remote_window) |
1967 | len = c->remote_window; | |
1968 | if (len > c->remote_maxpacket) | |
1969 | len = c->remote_maxpacket; | |
1970 | packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA); | |
1971 | packet_put_int(c->remote_id); | |
1972 | packet_put_int(SSH2_EXTENDED_DATA_STDERR); | |
1973 | packet_put_string(buffer_ptr(&c->extended), len); | |
1974 | packet_send(); | |
1975 | buffer_consume(&c->extended, len); | |
1976 | c->remote_window -= len; | |
ee55dacf | 1977 | debug2("channel %d: sent ext data %d", c->self, len); |
7e7327a1 | 1978 | } |
8efc0c15 | 1979 | } |
8efc0c15 | 1980 | } |
1981 | ||
8e7895b8 | 1982 | |
1983 | /* -- protocol input */ | |
04aa9e67 | 1984 | |
1985 | /* ARGSUSED */ | |
6ae2364d | 1986 | void |
7819b5c3 | 1987 | channel_input_data(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 1988 | { |
48e671d5 | 1989 | int id; |
5260325f | 1990 | char *data; |
1e3b8b07 | 1991 | u_int data_len; |
7368a6c8 | 1992 | Channel *c; |
5260325f | 1993 | |
1994 | /* Get the channel number and verify it. */ | |
48e671d5 | 1995 | id = packet_get_int(); |
7368a6c8 | 1996 | c = channel_lookup(id); |
1997 | if (c == NULL) | |
48e671d5 | 1998 | packet_disconnect("Received data for nonexistent channel %d.", id); |
5260325f | 1999 | |
2000 | /* Ignore any data for non-open channels (might happen on close) */ | |
7368a6c8 | 2001 | if (c->type != SSH_CHANNEL_OPEN && |
2002 | c->type != SSH_CHANNEL_X11_OPEN) | |
48e671d5 | 2003 | return; |
2004 | ||
5260325f | 2005 | /* Get the data. */ |
2006 | data = packet_get_string(&data_len); | |
7368a6c8 | 2007 | |
7741e239 | 2008 | /* |
2009 | * Ignore data for protocol > 1.3 if output end is no longer open. | |
2010 | * For protocol 2 the sending side is reducing its window as it sends | |
2011 | * data, so we must 'fake' consumption of the data in order to ensure | |
2012 | * that window updates are sent back. Otherwise the connection might | |
2013 | * deadlock. | |
2014 | */ | |
2015 | if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN) { | |
2016 | if (compat20) { | |
2017 | c->local_window -= data_len; | |
2018 | c->local_consumed += data_len; | |
2019 | } | |
2020 | xfree(data); | |
2021 | return; | |
2022 | } | |
2023 | ||
6aacefa7 | 2024 | if (compat20) { |
7e7327a1 | 2025 | if (data_len > c->local_maxpacket) { |
bbe88b6d | 2026 | logit("channel %d: rcvd big packet %d, maxpack %d", |
7e7327a1 | 2027 | c->self, data_len, c->local_maxpacket); |
2028 | } | |
2029 | if (data_len > c->local_window) { | |
bbe88b6d | 2030 | logit("channel %d: rcvd too much data %d, win %d", |
7e7327a1 | 2031 | c->self, data_len, c->local_window); |
2032 | xfree(data); | |
2033 | return; | |
2034 | } | |
2035 | c->local_window -= data_len; | |
7e7327a1 | 2036 | } |
95500969 | 2037 | packet_check_eom(); |
d20f3c9e | 2038 | if (c->datagram) |
2039 | buffer_put_string(&c->output, data, data_len); | |
2040 | else | |
2041 | buffer_append(&c->output, data, data_len); | |
5260325f | 2042 | xfree(data); |
8efc0c15 | 2043 | } |
8e7895b8 | 2044 | |
04aa9e67 | 2045 | /* ARGSUSED */ |
6ae2364d | 2046 | void |
7819b5c3 | 2047 | channel_input_extended_data(int type, u_int32_t seq, void *ctxt) |
7e7327a1 | 2048 | { |
2049 | int id; | |
7e7327a1 | 2050 | char *data; |
a594fa74 | 2051 | u_int data_len, tcode; |
7e7327a1 | 2052 | Channel *c; |
2053 | ||
2054 | /* Get the channel number and verify it. */ | |
2055 | id = packet_get_int(); | |
2056 | c = channel_lookup(id); | |
2057 | ||
2058 | if (c == NULL) | |
2059 | packet_disconnect("Received extended_data for bad channel %d.", id); | |
2060 | if (c->type != SSH_CHANNEL_OPEN) { | |
bbe88b6d | 2061 | logit("channel %d: ext data for non open", id); |
7e7327a1 | 2062 | return; |
2063 | } | |
d2296ed7 | 2064 | if (c->flags & CHAN_EOF_RCVD) { |
2065 | if (datafellows & SSH_BUG_EXTEOF) | |
2066 | debug("channel %d: accepting ext data after eof", id); | |
2067 | else | |
2068 | packet_disconnect("Received extended_data after EOF " | |
2069 | "on channel %d.", id); | |
2070 | } | |
7e7327a1 | 2071 | tcode = packet_get_int(); |
2072 | if (c->efd == -1 || | |
2073 | c->extended_usage != CHAN_EXTENDED_WRITE || | |
2074 | tcode != SSH2_EXTENDED_DATA_STDERR) { | |
bbe88b6d | 2075 | logit("channel %d: bad ext data", c->self); |
7e7327a1 | 2076 | return; |
2077 | } | |
2078 | data = packet_get_string(&data_len); | |
95500969 | 2079 | packet_check_eom(); |
7e7327a1 | 2080 | if (data_len > c->local_window) { |
bbe88b6d | 2081 | logit("channel %d: rcvd too much extended_data %d, win %d", |
7e7327a1 | 2082 | c->self, data_len, c->local_window); |
2083 | xfree(data); | |
2084 | return; | |
2085 | } | |
de273eef | 2086 | debug2("channel %d: rcvd ext data %d", c->self, data_len); |
7e7327a1 | 2087 | c->local_window -= data_len; |
2088 | buffer_append(&c->extended, data, data_len); | |
2089 | xfree(data); | |
2090 | } | |
2091 | ||
04aa9e67 | 2092 | /* ARGSUSED */ |
6ae2364d | 2093 | void |
7819b5c3 | 2094 | channel_input_ieof(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 2095 | { |
2096 | int id; | |
2097 | Channel *c; | |
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 ieof for nonexistent channel %d.", id); | |
2104 | chan_rcvd_ieof(c); | |
a5f82435 | 2105 | |
2106 | /* XXX force input close */ | |
8341f420 | 2107 | if (c->force_drain && c->istate == CHAN_INPUT_OPEN) { |
a5f82435 | 2108 | debug("channel %d: FORCE input drain", c->self); |
2109 | c->istate = CHAN_INPUT_WAIT_DRAIN; | |
32e7d71f | 2110 | if (buffer_len(&c->input) == 0) |
2111 | chan_ibuf_empty(c); | |
a5f82435 | 2112 | } |
2113 | ||
7368a6c8 | 2114 | } |
8efc0c15 | 2115 | |
04aa9e67 | 2116 | /* ARGSUSED */ |
6ae2364d | 2117 | void |
7819b5c3 | 2118 | channel_input_close(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2119 | { |
7368a6c8 | 2120 | int id; |
2121 | Channel *c; | |
5260325f | 2122 | |
7368a6c8 | 2123 | id = packet_get_int(); |
95500969 | 2124 | packet_check_eom(); |
7368a6c8 | 2125 | c = channel_lookup(id); |
2126 | if (c == NULL) | |
2127 | packet_disconnect("Received close for nonexistent channel %d.", id); | |
aa3378df | 2128 | |
2129 | /* | |
2130 | * Send a confirmation that we have closed the channel and no more | |
2131 | * data is coming for it. | |
2132 | */ | |
5260325f | 2133 | packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION); |
7368a6c8 | 2134 | packet_put_int(c->remote_id); |
5260325f | 2135 | packet_send(); |
2136 | ||
aa3378df | 2137 | /* |
2138 | * If the channel is in closed state, we have sent a close request, | |
2139 | * and the other side will eventually respond with a confirmation. | |
2140 | * Thus, we cannot free the channel here, because then there would be | |
2141 | * no-one to receive the confirmation. The channel gets freed when | |
2142 | * the confirmation arrives. | |
2143 | */ | |
7368a6c8 | 2144 | if (c->type != SSH_CHANNEL_CLOSED) { |
aa3378df | 2145 | /* |
2146 | * Not a closed channel - mark it as draining, which will | |
2147 | * cause it to be freed later. | |
2148 | */ | |
9c50edcf | 2149 | buffer_clear(&c->input); |
7368a6c8 | 2150 | c->type = SSH_CHANNEL_OUTPUT_DRAINING; |
5260325f | 2151 | } |
8efc0c15 | 2152 | } |
2153 | ||
7368a6c8 | 2154 | /* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */ |
04aa9e67 | 2155 | /* ARGSUSED */ |
6ae2364d | 2156 | void |
7819b5c3 | 2157 | channel_input_oclose(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2158 | { |
7368a6c8 | 2159 | int id = packet_get_int(); |
2160 | Channel *c = channel_lookup(id); | |
a8a21a53 | 2161 | |
95500969 | 2162 | packet_check_eom(); |
7368a6c8 | 2163 | if (c == NULL) |
2164 | packet_disconnect("Received oclose for nonexistent channel %d.", id); | |
2165 | chan_rcvd_oclose(c); | |
8efc0c15 | 2166 | } |
2167 | ||
04aa9e67 | 2168 | /* ARGSUSED */ |
6ae2364d | 2169 | void |
7819b5c3 | 2170 | channel_input_close_confirmation(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 2171 | { |
2172 | int id = packet_get_int(); | |
2173 | Channel *c = channel_lookup(id); | |
2174 | ||
95500969 | 2175 | packet_check_eom(); |
7368a6c8 | 2176 | if (c == NULL) |
2177 | packet_disconnect("Received close confirmation for " | |
2178 | "out-of-range channel %d.", id); | |
2179 | if (c->type != SSH_CHANNEL_CLOSED) | |
2180 | packet_disconnect("Received close confirmation for " | |
2181 | "non-closed channel %d (type %d).", id, c->type); | |
719fc62f | 2182 | channel_free(c); |
7368a6c8 | 2183 | } |
8efc0c15 | 2184 | |
04aa9e67 | 2185 | /* ARGSUSED */ |
6ae2364d | 2186 | void |
7819b5c3 | 2187 | channel_input_open_confirmation(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2188 | { |
7368a6c8 | 2189 | int id, remote_id; |
2190 | Channel *c; | |
5260325f | 2191 | |
7368a6c8 | 2192 | id = packet_get_int(); |
2193 | c = channel_lookup(id); | |
5260325f | 2194 | |
7368a6c8 | 2195 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) |
2196 | packet_disconnect("Received open confirmation for " | |
2197 | "non-opening channel %d.", id); | |
2198 | remote_id = packet_get_int(); | |
aa3378df | 2199 | /* Record the remote channel number and mark that the channel is now open. */ |
7368a6c8 | 2200 | c->remote_id = remote_id; |
2201 | c->type = SSH_CHANNEL_OPEN; | |
7e7327a1 | 2202 | |
2203 | if (compat20) { | |
2204 | c->remote_window = packet_get_int(); | |
2205 | c->remote_maxpacket = packet_get_int(); | |
05ca0898 | 2206 | if (c->confirm) { |
de273eef | 2207 | debug2("callback start"); |
5e96b616 | 2208 | c->confirm(c->self, c->confirm_ctx); |
de273eef | 2209 | debug2("callback done"); |
7e7327a1 | 2210 | } |
d7ac5f18 | 2211 | debug2("channel %d: open confirm rwindow %u rmax %u", c->self, |
7e7327a1 | 2212 | c->remote_window, c->remote_maxpacket); |
2213 | } | |
95500969 | 2214 | packet_check_eom(); |
8efc0c15 | 2215 | } |
2216 | ||
396c147e | 2217 | static char * |
d18e0850 | 2218 | reason2txt(int reason) |
2219 | { | |
6aacefa7 | 2220 | switch (reason) { |
d18e0850 | 2221 | case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED: |
2222 | return "administratively prohibited"; | |
2223 | case SSH2_OPEN_CONNECT_FAILED: | |
2224 | return "connect failed"; | |
2225 | case SSH2_OPEN_UNKNOWN_CHANNEL_TYPE: | |
2226 | return "unknown channel type"; | |
2227 | case SSH2_OPEN_RESOURCE_SHORTAGE: | |
2228 | return "resource shortage"; | |
2229 | } | |
7e8c18e9 | 2230 | return "unknown reason"; |
d18e0850 | 2231 | } |
2232 | ||
04aa9e67 | 2233 | /* ARGSUSED */ |
6ae2364d | 2234 | void |
7819b5c3 | 2235 | channel_input_open_failure(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2236 | { |
02a024dd | 2237 | int id, reason; |
2238 | char *msg = NULL, *lang = NULL; | |
7368a6c8 | 2239 | Channel *c; |
5260325f | 2240 | |
7368a6c8 | 2241 | id = packet_get_int(); |
2242 | c = channel_lookup(id); | |
2243 | ||
2244 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) | |
2245 | packet_disconnect("Received open failure for " | |
2246 | "non-opening channel %d.", id); | |
7e7327a1 | 2247 | if (compat20) { |
02a024dd | 2248 | reason = packet_get_int(); |
fbe90f7b | 2249 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { |
02a024dd | 2250 | msg = packet_get_string(NULL); |
2251 | lang = packet_get_string(NULL); | |
2252 | } | |
bbe88b6d | 2253 | logit("channel %d: open failed: %s%s%s", id, |
d18e0850 | 2254 | reason2txt(reason), msg ? ": ": "", msg ? msg : ""); |
02a024dd | 2255 | if (msg != NULL) |
2256 | xfree(msg); | |
2257 | if (lang != NULL) | |
2258 | xfree(lang); | |
7e7327a1 | 2259 | } |
95500969 | 2260 | packet_check_eom(); |
5260325f | 2261 | /* Free the channel. This will also close the socket. */ |
719fc62f | 2262 | channel_free(c); |
8efc0c15 | 2263 | } |
2264 | ||
04aa9e67 | 2265 | /* ARGSUSED */ |
8e7895b8 | 2266 | void |
7819b5c3 | 2267 | channel_input_window_adjust(int type, u_int32_t seq, void *ctxt) |
8e7895b8 | 2268 | { |
2269 | Channel *c; | |
f91d9a89 | 2270 | int id; |
2271 | u_int adjust; | |
3ffc6336 | 2272 | |
8e7895b8 | 2273 | if (!compat20) |
2274 | return; | |
8efc0c15 | 2275 | |
8e7895b8 | 2276 | /* Get the channel number and verify it. */ |
2277 | id = packet_get_int(); | |
2278 | c = channel_lookup(id); | |
2279 | ||
b872f7f0 | 2280 | if (c == NULL) { |
2281 | logit("Received window adjust for non-open channel %d.", id); | |
8e7895b8 | 2282 | return; |
2283 | } | |
2284 | adjust = packet_get_int(); | |
95500969 | 2285 | packet_check_eom(); |
f91d9a89 | 2286 | debug2("channel %d: rcvd adjust %u", id, adjust); |
8e7895b8 | 2287 | c->remote_window += adjust; |
2288 | } | |
2289 | ||
04aa9e67 | 2290 | /* ARGSUSED */ |
8e7895b8 | 2291 | void |
7819b5c3 | 2292 | channel_input_port_open(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2293 | { |
8e7895b8 | 2294 | Channel *c = NULL; |
2295 | u_short host_port; | |
2296 | char *host, *originator_string; | |
2297 | int remote_id, sock = -1; | |
5260325f | 2298 | |
8e7895b8 | 2299 | remote_id = packet_get_int(); |
2300 | host = packet_get_string(NULL); | |
2301 | host_port = packet_get_int(); | |
2302 | ||
2303 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) { | |
2304 | originator_string = packet_get_string(NULL); | |
2305 | } else { | |
2306 | originator_string = xstrdup("unknown (remote did not supply name)"); | |
2307 | } | |
95500969 | 2308 | packet_check_eom(); |
8e7895b8 | 2309 | sock = channel_connect_to(host, host_port); |
2310 | if (sock != -1) { | |
2311 | c = channel_new("connected socket", | |
2312 | SSH_CHANNEL_CONNECTING, sock, sock, -1, 0, 0, 0, | |
2313 | originator_string, 1); | |
3a0d3d54 | 2314 | c->remote_id = remote_id; |
5260325f | 2315 | } |
0d942eff | 2316 | xfree(originator_string); |
8e7895b8 | 2317 | if (c == NULL) { |
2318 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
2319 | packet_put_int(remote_id); | |
2320 | packet_send(); | |
2321 | } | |
2322 | xfree(host); | |
8efc0c15 | 2323 | } |
2324 | ||
8e7895b8 | 2325 | |
2326 | /* -- tcp forwarding */ | |
2327 | ||
5e4a7219 | 2328 | void |
2329 | channel_set_af(int af) | |
2330 | { | |
2331 | IPv4or6 = af; | |
2332 | } | |
2333 | ||
5641aefa | 2334 | static int |
2335 | channel_setup_fwd_listener(int type, const char *listen_addr, u_short listen_port, | |
2336 | const char *host_to_connect, u_short port_to_connect, int gateway_ports) | |
8efc0c15 | 2337 | { |
719fc62f | 2338 | Channel *c; |
442aee3a | 2339 | int sock, r, success = 0, wildcard = 0, is_client; |
48e671d5 | 2340 | struct addrinfo hints, *ai, *aitop; |
3867aa0a | 2341 | const char *host, *addr; |
5641aefa | 2342 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
5260325f | 2343 | |
5641aefa | 2344 | host = (type == SSH_CHANNEL_RPORT_LISTENER) ? |
2345 | listen_addr : host_to_connect; | |
3867aa0a | 2346 | is_client = (type == SSH_CHANNEL_PORT_LISTENER); |
02a024dd | 2347 | |
5641aefa | 2348 | if (host == NULL) { |
2349 | error("No forward host name."); | |
38946c65 | 2350 | return 0; |
fa08c86b | 2351 | } |
719fc62f | 2352 | if (strlen(host) > SSH_CHANNEL_PATH_LEN - 1) { |
02a024dd | 2353 | error("Forward host name too long."); |
38946c65 | 2354 | return 0; |
02a024dd | 2355 | } |
5260325f | 2356 | |
3867aa0a | 2357 | /* |
2358 | * Determine whether or not a port forward listens to loopback, | |
f8cc7664 | 2359 | * specified address or wildcard. On the client, a specified bind |
2360 | * address will always override gateway_ports. On the server, a | |
2361 | * gateway_ports of 1 (``yes'') will override the client's | |
2362 | * specification and force a wildcard bind, whereas a value of 2 | |
2363 | * (``clientspecified'') will bind to whatever address the client | |
3867aa0a | 2364 | * asked for. |
2365 | * | |
2366 | * Special-case listen_addrs are: | |
2367 | * | |
2368 | * "0.0.0.0" -> wildcard v4/v6 if SSH_OLD_FORWARD_ADDR | |
2369 | * "" (empty string), "*" -> wildcard v4/v6 | |
2370 | * "localhost" -> loopback v4/v6 | |
2371 | */ | |
2372 | addr = NULL; | |
2373 | if (listen_addr == NULL) { | |
2374 | /* No address specified: default to gateway_ports setting */ | |
2375 | if (gateway_ports) | |
2376 | wildcard = 1; | |
2377 | } else if (gateway_ports || is_client) { | |
2378 | if (((datafellows & SSH_OLD_FORWARD_ADDR) && | |
2379 | strcmp(listen_addr, "0.0.0.0") == 0) || | |
2380 | *listen_addr == '\0' || strcmp(listen_addr, "*") == 0 || | |
2381 | (!is_client && gateway_ports == 1)) | |
2382 | wildcard = 1; | |
2383 | else if (strcmp(listen_addr, "localhost") != 0) | |
2384 | addr = listen_addr; | |
2385 | } | |
2386 | ||
2387 | debug3("channel_setup_fwd_listener: type %d wildcard %d addr %s", | |
2388 | type, wildcard, (addr == NULL) ? "NULL" : addr); | |
2389 | ||
aa3378df | 2390 | /* |
48e671d5 | 2391 | * getaddrinfo returns a loopback address if the hostname is |
2392 | * set to NULL and hints.ai_flags is not AI_PASSIVE | |
aa3378df | 2393 | */ |
48e671d5 | 2394 | memset(&hints, 0, sizeof(hints)); |
2395 | hints.ai_family = IPv4or6; | |
3867aa0a | 2396 | hints.ai_flags = wildcard ? AI_PASSIVE : 0; |
48e671d5 | 2397 | hints.ai_socktype = SOCK_STREAM; |
fa08c86b | 2398 | snprintf(strport, sizeof strport, "%d", listen_port); |
3867aa0a | 2399 | if ((r = getaddrinfo(addr, strport, &hints, &aitop)) != 0) { |
2400 | if (addr == NULL) { | |
2401 | /* This really shouldn't happen */ | |
2402 | packet_disconnect("getaddrinfo: fatal error: %s", | |
2403 | gai_strerror(r)); | |
2404 | } else { | |
38946c65 | 2405 | error("channel_setup_fwd_listener: " |
3867aa0a | 2406 | "getaddrinfo(%.64s): %s", addr, gai_strerror(r)); |
2407 | } | |
38946c65 | 2408 | return 0; |
3867aa0a | 2409 | } |
48e671d5 | 2410 | |
48e671d5 | 2411 | for (ai = aitop; ai; ai = ai->ai_next) { |
2412 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
2413 | continue; | |
2414 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), | |
2415 | strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { | |
5641aefa | 2416 | error("channel_setup_fwd_listener: getnameinfo failed"); |
48e671d5 | 2417 | continue; |
2418 | } | |
2419 | /* Create a port to listen for the host. */ | |
3e131a6d | 2420 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
48e671d5 | 2421 | if (sock < 0) { |
2422 | /* this is no error since kernel may not support ipv6 */ | |
2423 | verbose("socket: %.100s", strerror(errno)); | |
2424 | continue; | |
2425 | } | |
442aee3a | 2426 | |
2427 | channel_set_reuseaddr(sock); | |
facfd613 | 2428 | |
48e671d5 | 2429 | debug("Local forwarding listening on %s port %s.", ntop, strport); |
2430 | ||
2431 | /* Bind the socket to the address. */ | |
2432 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { | |
2433 | /* address can be in use ipv6 address is already bound */ | |
16218745 | 2434 | if (!ai->ai_next) |
2435 | error("bind: %.100s", strerror(errno)); | |
2436 | else | |
2437 | verbose("bind: %.100s", strerror(errno)); | |
2b87da3b | 2438 | |
48e671d5 | 2439 | close(sock); |
2440 | continue; | |
2441 | } | |
2442 | /* Start listening for connections on the socket. */ | |
fce39749 | 2443 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { |
48e671d5 | 2444 | error("listen: %.100s", strerror(errno)); |
2445 | close(sock); | |
2446 | continue; | |
2447 | } | |
2448 | /* Allocate a channel number for the socket. */ | |
8e7895b8 | 2449 | c = channel_new("port listener", type, sock, sock, -1, |
0b242b12 | 2450 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, |
0d942eff | 2451 | 0, "port listener", 1); |
719fc62f | 2452 | strlcpy(c->path, host, sizeof(c->path)); |
2453 | c->host_port = port_to_connect; | |
2454 | c->listening_port = listen_port; | |
48e671d5 | 2455 | success = 1; |
2456 | } | |
2457 | if (success == 0) | |
5641aefa | 2458 | error("channel_setup_fwd_listener: cannot listen to port: %d", |
02a024dd | 2459 | listen_port); |
48e671d5 | 2460 | freeaddrinfo(aitop); |
02a024dd | 2461 | return success; |
5260325f | 2462 | } |
8efc0c15 | 2463 | |
d740ec16 | 2464 | int |
2465 | channel_cancel_rport_listener(const char *host, u_short port) | |
2466 | { | |
9a995072 | 2467 | u_int i; |
2468 | int found = 0; | |
d740ec16 | 2469 | |
f8cc7664 | 2470 | for (i = 0; i < channels_alloc; i++) { |
d740ec16 | 2471 | Channel *c = channels[i]; |
2472 | ||
2473 | if (c != NULL && c->type == SSH_CHANNEL_RPORT_LISTENER && | |
2474 | strncmp(c->path, host, sizeof(c->path)) == 0 && | |
f2107e97 | 2475 | c->listening_port == port) { |
2912cbd6 | 2476 | debug2("%s: close channel %d", __func__, i); |
d740ec16 | 2477 | channel_free(c); |
2478 | found = 1; | |
2479 | } | |
2480 | } | |
2481 | ||
2482 | return (found); | |
2483 | } | |
2484 | ||
5641aefa | 2485 | /* protocol local port fwd, used by ssh (and sshd in v1) */ |
2486 | int | |
3867aa0a | 2487 | channel_setup_local_fwd_listener(const char *listen_host, u_short listen_port, |
5641aefa | 2488 | const char *host_to_connect, u_short port_to_connect, int gateway_ports) |
2489 | { | |
2490 | return channel_setup_fwd_listener(SSH_CHANNEL_PORT_LISTENER, | |
3867aa0a | 2491 | listen_host, listen_port, host_to_connect, port_to_connect, |
2492 | gateway_ports); | |
5641aefa | 2493 | } |
2494 | ||
2495 | /* protocol v2 remote port fwd, used by sshd */ | |
2496 | int | |
2497 | channel_setup_remote_fwd_listener(const char *listen_address, | |
2498 | u_short listen_port, int gateway_ports) | |
2499 | { | |
2500 | return channel_setup_fwd_listener(SSH_CHANNEL_RPORT_LISTENER, | |
2501 | listen_address, listen_port, NULL, 0, gateway_ports); | |
2502 | } | |
2503 | ||
aa3378df | 2504 | /* |
2505 | * Initiate forwarding of connections to port "port" on remote host through | |
2506 | * the secure channel to host:port from local side. | |
2507 | */ | |
8efc0c15 | 2508 | |
42ea6f5e | 2509 | int |
3867aa0a | 2510 | channel_request_remote_forwarding(const char *listen_host, u_short listen_port, |
fa08c86b | 2511 | const char *host_to_connect, u_short port_to_connect) |
8efc0c15 | 2512 | { |
54a5250f | 2513 | int type, success = 0; |
fa08c86b | 2514 | |
5260325f | 2515 | /* Record locally that connection to this host/port is permitted. */ |
2516 | if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
2517 | fatal("channel_request_remote_forwarding: too many forwards"); | |
2518 | ||
5260325f | 2519 | /* Send the forward request to the remote side. */ |
7e7327a1 | 2520 | if (compat20) { |
3867aa0a | 2521 | const char *address_to_bind; |
2522 | if (listen_host == NULL) | |
2523 | address_to_bind = "localhost"; | |
2524 | else if (*listen_host == '\0' || strcmp(listen_host, "*") == 0) | |
2525 | address_to_bind = ""; | |
2526 | else | |
2527 | address_to_bind = listen_host; | |
2528 | ||
7e7327a1 | 2529 | packet_start(SSH2_MSG_GLOBAL_REQUEST); |
2530 | packet_put_cstring("tcpip-forward"); | |
e0ae8728 | 2531 | packet_put_char(1); /* boolean: want reply */ |
7e7327a1 | 2532 | packet_put_cstring(address_to_bind); |
2533 | packet_put_int(listen_port); | |
fa08c86b | 2534 | packet_send(); |
2535 | packet_write_wait(); | |
2536 | /* Assume that server accepts the request */ | |
2537 | success = 1; | |
7e7327a1 | 2538 | } else { |
2539 | packet_start(SSH_CMSG_PORT_FORWARD_REQUEST); | |
7e7327a1 | 2540 | packet_put_int(listen_port); |
d6f24e45 | 2541 | packet_put_cstring(host_to_connect); |
2542 | packet_put_int(port_to_connect); | |
7e7327a1 | 2543 | packet_send(); |
2544 | packet_write_wait(); | |
fa08c86b | 2545 | |
2546 | /* Wait for response from the remote side. */ | |
54a5250f | 2547 | type = packet_read(); |
fa08c86b | 2548 | switch (type) { |
2549 | case SSH_SMSG_SUCCESS: | |
2550 | success = 1; | |
2551 | break; | |
2552 | case SSH_SMSG_FAILURE: | |
fa08c86b | 2553 | break; |
2554 | default: | |
2555 | /* Unknown packet */ | |
2556 | packet_disconnect("Protocol error for port forward request:" | |
2557 | "received packet type %d.", type); | |
2558 | } | |
2559 | } | |
2560 | if (success) { | |
2561 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host_to_connect); | |
2562 | permitted_opens[num_permitted_opens].port_to_connect = port_to_connect; | |
2563 | permitted_opens[num_permitted_opens].listen_port = listen_port; | |
2564 | num_permitted_opens++; | |
7e7327a1 | 2565 | } |
42ea6f5e | 2566 | return (success ? 0 : -1); |
8efc0c15 | 2567 | } |
2568 | ||
d740ec16 | 2569 | /* |
f2107e97 | 2570 | * Request cancellation of remote forwarding of connection host:port from |
d740ec16 | 2571 | * local side. |
2572 | */ | |
d740ec16 | 2573 | void |
3867aa0a | 2574 | channel_request_rforward_cancel(const char *host, u_short port) |
d740ec16 | 2575 | { |
2576 | int i; | |
d740ec16 | 2577 | |
2578 | if (!compat20) | |
2579 | return; | |
2580 | ||
2581 | for (i = 0; i < num_permitted_opens; i++) { | |
f2107e97 | 2582 | if (permitted_opens[i].host_to_connect != NULL && |
d740ec16 | 2583 | permitted_opens[i].listen_port == port) |
2584 | break; | |
2585 | } | |
2586 | if (i >= num_permitted_opens) { | |
2587 | debug("%s: requested forward not found", __func__); | |
2588 | return; | |
2589 | } | |
2590 | packet_start(SSH2_MSG_GLOBAL_REQUEST); | |
2591 | packet_put_cstring("cancel-tcpip-forward"); | |
2592 | packet_put_char(0); | |
3867aa0a | 2593 | packet_put_cstring(host == NULL ? "" : host); |
d740ec16 | 2594 | packet_put_int(port); |
2595 | packet_send(); | |
2596 | ||
2597 | permitted_opens[i].listen_port = 0; | |
2598 | permitted_opens[i].port_to_connect = 0; | |
8c4bd764 | 2599 | xfree(permitted_opens[i].host_to_connect); |
d740ec16 | 2600 | permitted_opens[i].host_to_connect = NULL; |
2601 | } | |
2602 | ||
aa3378df | 2603 | /* |
2604 | * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates | |
2605 | * listening for the port, and sends back a success reply (or disconnect | |
42ea6f5e | 2606 | * message if there was an error). |
aa3378df | 2607 | */ |
42ea6f5e | 2608 | int |
1d1ffb87 | 2609 | channel_input_port_forward_request(int is_root, int gateway_ports) |
8efc0c15 | 2610 | { |
57112b5a | 2611 | u_short port, host_port; |
42ea6f5e | 2612 | int success = 0; |
5260325f | 2613 | char *hostname; |
2614 | ||
2615 | /* Get arguments from the packet. */ | |
2616 | port = packet_get_int(); | |
2617 | hostname = packet_get_string(NULL); | |
2618 | host_port = packet_get_int(); | |
2619 | ||
3c62e7eb | 2620 | #ifndef HAVE_CYGWIN |
aa3378df | 2621 | /* |
2622 | * Check that an unprivileged user is not trying to forward a | |
2623 | * privileged port. | |
2624 | */ | |
5260325f | 2625 | if (port < IPPORT_RESERVED && !is_root) |
8e7c9afc | 2626 | packet_disconnect( |
2627 | "Requested forwarding of port %d but user is not root.", | |
2628 | port); | |
2629 | if (host_port == 0) | |
2630 | packet_disconnect("Dynamic forwarding denied."); | |
3c62e7eb | 2631 | #endif |
8e7c9afc | 2632 | |
fa08c86b | 2633 | /* Initiate forwarding */ |
42ea6f5e | 2634 | success = channel_setup_local_fwd_listener(NULL, port, hostname, |
3867aa0a | 2635 | host_port, gateway_ports); |
5260325f | 2636 | |
2637 | /* Free the argument string. */ | |
2638 | xfree(hostname); | |
42ea6f5e | 2639 | |
2640 | return (success ? 0 : -1); | |
8efc0c15 | 2641 | } |
2642 | ||
01794848 | 2643 | /* |
2644 | * Permits opening to any host/port if permitted_opens[] is empty. This is | |
2645 | * usually called by the server, because the user could connect to any port | |
2646 | * anyway, and the server has no way to know but to trust the client anyway. | |
2647 | */ | |
2648 | void | |
d5bb9418 | 2649 | channel_permit_all_opens(void) |
01794848 | 2650 | { |
2651 | if (num_permitted_opens == 0) | |
2652 | all_opens_permitted = 1; | |
2653 | } | |
2654 | ||
cd332296 | 2655 | void |
01794848 | 2656 | channel_add_permitted_opens(char *host, int port) |
2657 | { | |
2658 | if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
42ea6f5e | 2659 | fatal("channel_add_permitted_opens: too many forwards"); |
01794848 | 2660 | debug("allow port forwarding to host %s port %d", host, port); |
2661 | ||
2662 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host); | |
2663 | permitted_opens[num_permitted_opens].port_to_connect = port; | |
2664 | num_permitted_opens++; | |
2665 | ||
2666 | all_opens_permitted = 0; | |
2667 | } | |
2668 | ||
ea46e550 | 2669 | int |
2fefbadf | 2670 | channel_add_adm_permitted_opens(char *host, int port) |
2671 | { | |
2672 | if (num_adm_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
2673 | fatal("channel_add_adm_permitted_opens: too many forwards"); | |
ea46e550 | 2674 | debug("config allows port forwarding to host %s port %d", host, port); |
2fefbadf | 2675 | |
2676 | permitted_adm_opens[num_adm_permitted_opens].host_to_connect | |
2677 | = xstrdup(host); | |
2678 | permitted_adm_opens[num_adm_permitted_opens].port_to_connect = port; | |
ea46e550 | 2679 | return ++num_adm_permitted_opens; |
2fefbadf | 2680 | } |
2681 | ||
cd332296 | 2682 | void |
01794848 | 2683 | channel_clear_permitted_opens(void) |
2684 | { | |
2685 | int i; | |
2686 | ||
2687 | for (i = 0; i < num_permitted_opens; i++) | |
d740ec16 | 2688 | if (permitted_opens[i].host_to_connect != NULL) |
2689 | xfree(permitted_opens[i].host_to_connect); | |
01794848 | 2690 | num_permitted_opens = 0; |
2fefbadf | 2691 | } |
2692 | ||
2693 | void | |
2694 | channel_clear_adm_permitted_opens(void) | |
2695 | { | |
2696 | int i; | |
01794848 | 2697 | |
2fefbadf | 2698 | for (i = 0; i < num_adm_permitted_opens; i++) |
2699 | if (permitted_adm_opens[i].host_to_connect != NULL) | |
2700 | xfree(permitted_adm_opens[i].host_to_connect); | |
2701 | num_adm_permitted_opens = 0; | |
01794848 | 2702 | } |
2703 | ||
01794848 | 2704 | /* return socket to remote host, port */ |
396c147e | 2705 | static int |
01794848 | 2706 | connect_to(const char *host, u_short port) |
8efc0c15 | 2707 | { |
48e671d5 | 2708 | struct addrinfo hints, *ai, *aitop; |
2709 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; | |
2710 | int gaierr; | |
7368a6c8 | 2711 | int sock = -1; |
48e671d5 | 2712 | |
2713 | memset(&hints, 0, sizeof(hints)); | |
2714 | hints.ai_family = IPv4or6; | |
2715 | hints.ai_socktype = SOCK_STREAM; | |
01794848 | 2716 | snprintf(strport, sizeof strport, "%d", port); |
48e671d5 | 2717 | if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) { |
01794848 | 2718 | error("connect_to %.100s: unknown host (%s)", host, |
2719 | gai_strerror(gaierr)); | |
7368a6c8 | 2720 | return -1; |
48e671d5 | 2721 | } |
48e671d5 | 2722 | for (ai = aitop; ai; ai = ai->ai_next) { |
2723 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
2724 | continue; | |
2725 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), | |
2726 | strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { | |
01794848 | 2727 | error("connect_to: getnameinfo failed"); |
48e671d5 | 2728 | continue; |
5260325f | 2729 | } |
3e131a6d | 2730 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
48e671d5 | 2731 | if (sock < 0) { |
4940c411 | 2732 | if (ai->ai_next == NULL) |
2733 | error("socket: %.100s", strerror(errno)); | |
2734 | else | |
2735 | verbose("socket: %.100s", strerror(errno)); | |
48e671d5 | 2736 | continue; |
5260325f | 2737 | } |
170694d7 | 2738 | if (set_nonblock(sock) == -1) |
2739 | fatal("%s: set_nonblock(%d)", __func__, sock); | |
97fb6912 | 2740 | if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0 && |
2741 | errno != EINPROGRESS) { | |
01794848 | 2742 | error("connect_to %.100s port %s: %.100s", ntop, strport, |
48e671d5 | 2743 | strerror(errno)); |
2744 | close(sock); | |
2b87da3b | 2745 | continue; /* fail -- try next */ |
48e671d5 | 2746 | } |
2747 | break; /* success */ | |
5260325f | 2748 | |
5260325f | 2749 | } |
48e671d5 | 2750 | freeaddrinfo(aitop); |
48e671d5 | 2751 | if (!ai) { |
01794848 | 2752 | error("connect_to %.100s port %d: failed.", host, port); |
7368a6c8 | 2753 | return -1; |
8efc0c15 | 2754 | } |
7368a6c8 | 2755 | /* success */ |
811a6342 | 2756 | set_nodelay(sock); |
7368a6c8 | 2757 | return sock; |
2758 | } | |
01794848 | 2759 | |
fa08c86b | 2760 | int |
b3f8a79c | 2761 | channel_connect_by_listen_address(u_short listen_port) |
fa08c86b | 2762 | { |
2763 | int i; | |
01794848 | 2764 | |
fa08c86b | 2765 | for (i = 0; i < num_permitted_opens; i++) |
d740ec16 | 2766 | if (permitted_opens[i].host_to_connect != NULL && |
2767 | permitted_opens[i].listen_port == listen_port) | |
01794848 | 2768 | return connect_to( |
fa08c86b | 2769 | permitted_opens[i].host_to_connect, |
2770 | permitted_opens[i].port_to_connect); | |
0b6fbf03 | 2771 | error("WARNING: Server requests forwarding for unknown listen_port %d", |
2772 | listen_port); | |
fa08c86b | 2773 | return -1; |
2774 | } | |
48e671d5 | 2775 | |
01794848 | 2776 | /* Check if connecting to that port is permitted and connect. */ |
2777 | int | |
2778 | channel_connect_to(const char *host, u_short port) | |
2779 | { | |
2fefbadf | 2780 | int i, permit, permit_adm = 1; |
01794848 | 2781 | |
2782 | permit = all_opens_permitted; | |
2783 | if (!permit) { | |
2784 | for (i = 0; i < num_permitted_opens; i++) | |
d740ec16 | 2785 | if (permitted_opens[i].host_to_connect != NULL && |
2786 | permitted_opens[i].port_to_connect == port && | |
01794848 | 2787 | strcmp(permitted_opens[i].host_to_connect, host) == 0) |
2788 | permit = 1; | |
2fefbadf | 2789 | } |
01794848 | 2790 | |
2fefbadf | 2791 | if (num_adm_permitted_opens > 0) { |
2792 | permit_adm = 0; | |
2793 | for (i = 0; i < num_adm_permitted_opens; i++) | |
2794 | if (permitted_adm_opens[i].host_to_connect != NULL && | |
2795 | permitted_adm_opens[i].port_to_connect == port && | |
2796 | strcmp(permitted_adm_opens[i].host_to_connect, host) | |
2797 | == 0) | |
2798 | permit_adm = 1; | |
01794848 | 2799 | } |
2fefbadf | 2800 | |
2801 | if (!permit || !permit_adm) { | |
bbe88b6d | 2802 | logit("Received request to connect to host %.100s port %d, " |
01794848 | 2803 | "but the request was denied.", host, port); |
2804 | return -1; | |
2805 | } | |
2806 | return connect_to(host, port); | |
2807 | } | |
2808 | ||
5e96b616 | 2809 | void |
2810 | channel_send_window_changes(void) | |
2811 | { | |
9a995072 | 2812 | u_int i; |
5e96b616 | 2813 | struct winsize ws; |
2814 | ||
2815 | for (i = 0; i < channels_alloc; i++) { | |
f8cc7664 | 2816 | if (channels[i] == NULL || !channels[i]->client_tty || |
5e96b616 | 2817 | channels[i]->type != SSH_CHANNEL_OPEN) |
2818 | continue; | |
2819 | if (ioctl(channels[i]->rfd, TIOCGWINSZ, &ws) < 0) | |
2820 | continue; | |
2821 | channel_request_start(i, "window-change", 0); | |
148de80c | 2822 | packet_put_int((u_int)ws.ws_col); |
2823 | packet_put_int((u_int)ws.ws_row); | |
2824 | packet_put_int((u_int)ws.ws_xpixel); | |
2825 | packet_put_int((u_int)ws.ws_ypixel); | |
5e96b616 | 2826 | packet_send(); |
2827 | } | |
2828 | } | |
2829 | ||
8e7895b8 | 2830 | /* -- X11 forwarding */ |
8efc0c15 | 2831 | |
aa3378df | 2832 | /* |
2833 | * Creates an internet domain socket for listening for X11 connections. | |
57f228e8 | 2834 | * Returns 0 and a suitable display number for the DISPLAY variable |
2835 | * stored in display_numberp , or -1 if an error occurs. | |
aa3378df | 2836 | */ |
c9d0ad9b | 2837 | int |
e6e573bd | 2838 | x11_create_display_inet(int x11_display_offset, int x11_use_localhost, |
d08341e6 | 2839 | int single_connection, u_int *display_numberp, int **chanids) |
8efc0c15 | 2840 | { |
ac151b18 | 2841 | Channel *nc = NULL; |
57112b5a | 2842 | int display_number, sock; |
2843 | u_short port; | |
48e671d5 | 2844 | struct addrinfo hints, *ai, *aitop; |
2845 | char strport[NI_MAXSERV]; | |
2846 | int gaierr, n, num_socks = 0, socks[NUM_SOCKS]; | |
5260325f | 2847 | |
59e5aff5 | 2848 | if (chanids == NULL) |
2849 | return -1; | |
2850 | ||
95f1eccc | 2851 | for (display_number = x11_display_offset; |
184eed6a | 2852 | display_number < MAX_DISPLAYS; |
2853 | display_number++) { | |
5260325f | 2854 | port = 6000 + display_number; |
48e671d5 | 2855 | memset(&hints, 0, sizeof(hints)); |
2856 | hints.ai_family = IPv4or6; | |
e6e573bd | 2857 | hints.ai_flags = x11_use_localhost ? 0: AI_PASSIVE; |
48e671d5 | 2858 | hints.ai_socktype = SOCK_STREAM; |
2859 | snprintf(strport, sizeof strport, "%d", port); | |
2860 | if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) { | |
2861 | error("getaddrinfo: %.100s", gai_strerror(gaierr)); | |
c9d0ad9b | 2862 | return -1; |
5260325f | 2863 | } |
48e671d5 | 2864 | for (ai = aitop; ai; ai = ai->ai_next) { |
2865 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
2866 | continue; | |
3e131a6d | 2867 | sock = socket(ai->ai_family, ai->ai_socktype, |
2868 | ai->ai_protocol); | |
48e671d5 | 2869 | if (sock < 0) { |
4ee81249 | 2870 | if ((errno != EINVAL) && (errno != EAFNOSUPPORT)) { |
80a44451 | 2871 | error("socket: %.100s", strerror(errno)); |
0ea89f7e | 2872 | freeaddrinfo(aitop); |
c9d0ad9b | 2873 | return -1; |
80a44451 | 2874 | } else { |
22d89d24 | 2875 | debug("x11_create_display_inet: Socket family %d not supported", |
2876 | ai->ai_family); | |
80a44451 | 2877 | continue; |
2878 | } | |
48e671d5 | 2879 | } |
688aaeda | 2880 | #ifdef IPV6_V6ONLY |
2881 | if (ai->ai_family == AF_INET6) { | |
2882 | int on = 1; | |
2883 | if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) < 0) | |
2884 | error("setsockopt IPV6_V6ONLY: %.100s", strerror(errno)); | |
2885 | } | |
2886 | #endif | |
442aee3a | 2887 | channel_set_reuseaddr(sock); |
48e671d5 | 2888 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { |
d7ac5f18 | 2889 | debug2("bind port %d: %.100s", port, strerror(errno)); |
48e671d5 | 2890 | close(sock); |
16218745 | 2891 | |
2892 | if (ai->ai_next) | |
2893 | continue; | |
2894 | ||
48e671d5 | 2895 | for (n = 0; n < num_socks; n++) { |
48e671d5 | 2896 | close(socks[n]); |
2897 | } | |
2898 | num_socks = 0; | |
2899 | break; | |
2900 | } | |
2901 | socks[num_socks++] = sock; | |
80faa19f | 2902 | #ifndef DONT_TRY_OTHER_AF |
48e671d5 | 2903 | if (num_socks == NUM_SOCKS) |
2904 | break; | |
80faa19f | 2905 | #else |
688aaeda | 2906 | if (x11_use_localhost) { |
2907 | if (num_socks == NUM_SOCKS) | |
2908 | break; | |
2909 | } else { | |
2910 | break; | |
2911 | } | |
80faa19f | 2912 | #endif |
5260325f | 2913 | } |
4ccb01d6 | 2914 | freeaddrinfo(aitop); |
48e671d5 | 2915 | if (num_socks > 0) |
2916 | break; | |
5260325f | 2917 | } |
2918 | if (display_number >= MAX_DISPLAYS) { | |
2919 | error("Failed to allocate internet-domain X11 display socket."); | |
c9d0ad9b | 2920 | return -1; |
8efc0c15 | 2921 | } |
5260325f | 2922 | /* Start listening for connections on the socket. */ |
48e671d5 | 2923 | for (n = 0; n < num_socks; n++) { |
2924 | sock = socks[n]; | |
fce39749 | 2925 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { |
48e671d5 | 2926 | error("listen: %.100s", strerror(errno)); |
48e671d5 | 2927 | close(sock); |
c9d0ad9b | 2928 | return -1; |
a7effaac | 2929 | } |
a7effaac | 2930 | } |
5260325f | 2931 | |
48e671d5 | 2932 | /* Allocate a channel for each socket. */ |
52e3daed | 2933 | *chanids = xcalloc(num_socks + 1, sizeof(**chanids)); |
48e671d5 | 2934 | for (n = 0; n < num_socks; n++) { |
2935 | sock = socks[n]; | |
ac151b18 | 2936 | nc = channel_new("x11 listener", |
0b242b12 | 2937 | SSH_CHANNEL_X11_LISTENER, sock, sock, -1, |
2938 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, | |
0d942eff | 2939 | 0, "X11 inet listener", 1); |
3a0d3d54 | 2940 | nc->single_connection = single_connection; |
59e5aff5 | 2941 | (*chanids)[n] = nc->self; |
48e671d5 | 2942 | } |
59e5aff5 | 2943 | (*chanids)[n] = -1; |
5260325f | 2944 | |
c9d0ad9b | 2945 | /* Return the display number for the DISPLAY environment variable. */ |
57f228e8 | 2946 | *display_numberp = display_number; |
2947 | return (0); | |
8efc0c15 | 2948 | } |
2949 | ||
396c147e | 2950 | static int |
1e3b8b07 | 2951 | connect_local_xsocket(u_int dnr) |
8efc0c15 | 2952 | { |
5260325f | 2953 | int sock; |
2954 | struct sockaddr_un addr; | |
5260325f | 2955 | |
805e659f | 2956 | sock = socket(AF_UNIX, SOCK_STREAM, 0); |
2957 | if (sock < 0) | |
2958 | error("socket: %.100s", strerror(errno)); | |
2959 | memset(&addr, 0, sizeof(addr)); | |
2960 | addr.sun_family = AF_UNIX; | |
2961 | snprintf(addr.sun_path, sizeof addr.sun_path, _PATH_UNIX_X, dnr); | |
32596c7b | 2962 | if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) == 0) |
805e659f | 2963 | return sock; |
2964 | close(sock); | |
5260325f | 2965 | error("connect %.100s: %.100s", addr.sun_path, strerror(errno)); |
2966 | return -1; | |
8efc0c15 | 2967 | } |
2968 | ||
0b242b12 | 2969 | int |
2970 | x11_connect_display(void) | |
8efc0c15 | 2971 | { |
4f16046f | 2972 | u_int display_number; |
5260325f | 2973 | const char *display; |
0b242b12 | 2974 | char buf[1024], *cp; |
48e671d5 | 2975 | struct addrinfo hints, *ai, *aitop; |
2976 | char strport[NI_MAXSERV]; | |
4f16046f | 2977 | int gaierr, sock = 0; |
5260325f | 2978 | |
5260325f | 2979 | /* Try to open a socket for the local X server. */ |
2980 | display = getenv("DISPLAY"); | |
2981 | if (!display) { | |
2982 | error("DISPLAY not set."); | |
0b242b12 | 2983 | return -1; |
5260325f | 2984 | } |
aa3378df | 2985 | /* |
2986 | * Now we decode the value of the DISPLAY variable and make a | |
2987 | * connection to the real X server. | |
2988 | */ | |
2989 | ||
2990 | /* | |
2991 | * Check if it is a unix domain socket. Unix domain displays are in | |
2992 | * one of the following formats: unix:d[.s], :d[.s], ::d[.s] | |
2993 | */ | |
5260325f | 2994 | if (strncmp(display, "unix:", 5) == 0 || |
2995 | display[0] == ':') { | |
2996 | /* Connect to the unix domain socket. */ | |
4f16046f | 2997 | if (sscanf(strrchr(display, ':') + 1, "%u", &display_number) != 1) { |
5260325f | 2998 | error("Could not parse display number from DISPLAY: %.100s", |
184eed6a | 2999 | display); |
0b242b12 | 3000 | return -1; |
5260325f | 3001 | } |
3002 | /* Create a socket. */ | |
3003 | sock = connect_local_xsocket(display_number); | |
3004 | if (sock < 0) | |
0b242b12 | 3005 | return -1; |
5260325f | 3006 | |
3007 | /* OK, we now have a connection to the display. */ | |
0b242b12 | 3008 | return sock; |
5260325f | 3009 | } |
aa3378df | 3010 | /* |
3011 | * Connect to an inet socket. The DISPLAY value is supposedly | |
3012 | * hostname:d[.s], where hostname may also be numeric IP address. | |
3013 | */ | |
74860245 | 3014 | strlcpy(buf, display, sizeof(buf)); |
5260325f | 3015 | cp = strchr(buf, ':'); |
3016 | if (!cp) { | |
3017 | error("Could not find ':' in DISPLAY: %.100s", display); | |
0b242b12 | 3018 | return -1; |
5260325f | 3019 | } |
3020 | *cp = 0; | |
aa3378df | 3021 | /* buf now contains the host name. But first we parse the display number. */ |
4f16046f | 3022 | if (sscanf(cp + 1, "%u", &display_number) != 1) { |
5260325f | 3023 | error("Could not parse display number from DISPLAY: %.100s", |
184eed6a | 3024 | display); |
0b242b12 | 3025 | return -1; |
5260325f | 3026 | } |
5260325f | 3027 | |
48e671d5 | 3028 | /* Look up the host address */ |
3029 | memset(&hints, 0, sizeof(hints)); | |
3030 | hints.ai_family = IPv4or6; | |
3031 | hints.ai_socktype = SOCK_STREAM; | |
4f16046f | 3032 | snprintf(strport, sizeof strport, "%u", 6000 + display_number); |
48e671d5 | 3033 | if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) { |
3034 | error("%.100s: unknown host. (%s)", buf, gai_strerror(gaierr)); | |
0b242b12 | 3035 | return -1; |
8efc0c15 | 3036 | } |
48e671d5 | 3037 | for (ai = aitop; ai; ai = ai->ai_next) { |
3038 | /* Create a socket. */ | |
3e131a6d | 3039 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
48e671d5 | 3040 | if (sock < 0) { |
d7ac5f18 | 3041 | debug2("socket: %.100s", strerror(errno)); |
7368a6c8 | 3042 | continue; |
3043 | } | |
3044 | /* Connect it to the display. */ | |
3045 | if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) { | |
4f16046f | 3046 | debug2("connect %.100s port %u: %.100s", buf, |
7368a6c8 | 3047 | 6000 + display_number, strerror(errno)); |
3048 | close(sock); | |
3049 | continue; | |
3050 | } | |
3051 | /* Success */ | |
3052 | break; | |
48e671d5 | 3053 | } |
48e671d5 | 3054 | freeaddrinfo(aitop); |
3055 | if (!ai) { | |
4f16046f | 3056 | error("connect %.100s port %u: %.100s", buf, 6000 + display_number, |
48e671d5 | 3057 | strerror(errno)); |
0b242b12 | 3058 | return -1; |
8efc0c15 | 3059 | } |
bcc0381e | 3060 | set_nodelay(sock); |
0b242b12 | 3061 | return sock; |
3062 | } | |
5260325f | 3063 | |
0b242b12 | 3064 | /* |
3065 | * This is called when SSH_SMSG_X11_OPEN is received. The packet contains | |
3066 | * the remote channel number. We should do whatever we want, and respond | |
3067 | * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE. | |
3068 | */ | |
5260325f | 3069 | |
ebb90778 | 3070 | /* ARGSUSED */ |
0b242b12 | 3071 | void |
7819b5c3 | 3072 | x11_input_open(int type, u_int32_t seq, void *ctxt) |
0b242b12 | 3073 | { |
719fc62f | 3074 | Channel *c = NULL; |
3075 | int remote_id, sock = 0; | |
0b242b12 | 3076 | char *remote_host; |
5260325f | 3077 | |
719fc62f | 3078 | debug("Received X11 open request."); |
5260325f | 3079 | |
719fc62f | 3080 | remote_id = packet_get_int(); |
8e7895b8 | 3081 | |
3082 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) { | |
719fc62f | 3083 | remote_host = packet_get_string(NULL); |
0b242b12 | 3084 | } else { |
3085 | remote_host = xstrdup("unknown (remote did not supply name)"); | |
0b242b12 | 3086 | } |
95500969 | 3087 | packet_check_eom(); |
0b242b12 | 3088 | |
3089 | /* Obtain a connection to the real X display. */ | |
3090 | sock = x11_connect_display(); | |
719fc62f | 3091 | if (sock != -1) { |
3092 | /* Allocate a channel for this connection. */ | |
3093 | c = channel_new("connected x11 socket", | |
3094 | SSH_CHANNEL_X11_OPEN, sock, sock, -1, 0, 0, 0, | |
3095 | remote_host, 1); | |
3a0d3d54 | 3096 | c->remote_id = remote_id; |
3097 | c->force_drain = 1; | |
719fc62f | 3098 | } |
0d942eff | 3099 | xfree(remote_host); |
719fc62f | 3100 | if (c == NULL) { |
0b242b12 | 3101 | /* Send refusal to the remote host. */ |
3102 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
719fc62f | 3103 | packet_put_int(remote_id); |
0b242b12 | 3104 | } else { |
0b242b12 | 3105 | /* Send a confirmation to the remote host. */ |
3106 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
719fc62f | 3107 | packet_put_int(remote_id); |
3108 | packet_put_int(c->self); | |
0b242b12 | 3109 | } |
719fc62f | 3110 | packet_send(); |
8efc0c15 | 3111 | } |
3112 | ||
a22aff1f | 3113 | /* dummy protocol handler that denies SSH-1 requests (agent/x11) */ |
ebb90778 | 3114 | /* ARGSUSED */ |
a22aff1f | 3115 | void |
7819b5c3 | 3116 | deny_input_open(int type, u_int32_t seq, void *ctxt) |
a22aff1f | 3117 | { |
3118 | int rchan = packet_get_int(); | |
e1feb9bf | 3119 | |
6aacefa7 | 3120 | switch (type) { |
a22aff1f | 3121 | case SSH_SMSG_AGENT_OPEN: |
3122 | error("Warning: ssh server tried agent forwarding."); | |
3123 | break; | |
3124 | case SSH_SMSG_X11_OPEN: | |
3125 | error("Warning: ssh server tried X11 forwarding."); | |
3126 | break; | |
3127 | default: | |
7819b5c3 | 3128 | error("deny_input_open: type %d", type); |
a22aff1f | 3129 | break; |
3130 | } | |
1908529f | 3131 | error("Warning: this is probably a break-in attempt by a malicious server."); |
a22aff1f | 3132 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
3133 | packet_put_int(rchan); | |
3134 | packet_send(); | |
3135 | } | |
3136 | ||
aa3378df | 3137 | /* |
3138 | * Requests forwarding of X11 connections, generates fake authentication | |
3139 | * data, and enables authentication spoofing. | |
8e7895b8 | 3140 | * This should be called in the client only. |
aa3378df | 3141 | */ |
6ae2364d | 3142 | void |
9bf083eb | 3143 | x11_request_forwarding_with_spoofing(int client_session_id, const char *disp, |
0b242b12 | 3144 | const char *proto, const char *data) |
8efc0c15 | 3145 | { |
1e3b8b07 | 3146 | u_int data_len = (u_int) strlen(data) / 2; |
ef07103c | 3147 | u_int i, value; |
5260325f | 3148 | char *new_data; |
3149 | int screen_number; | |
3150 | const char *cp; | |
ca75d7de | 3151 | u_int32_t rnd = 0; |
5260325f | 3152 | |
4297b666 | 3153 | if (x11_saved_display == NULL) |
3154 | x11_saved_display = xstrdup(disp); | |
3155 | else if (strcmp(disp, x11_saved_display) != 0) { | |
ef07103c | 3156 | error("x11_request_forwarding_with_spoofing: different " |
3157 | "$DISPLAY already forwarded"); | |
3158 | return; | |
3159 | } | |
3160 | ||
9bf083eb | 3161 | cp = disp; |
3162 | if (disp) | |
3163 | cp = strchr(disp, ':'); | |
5260325f | 3164 | if (cp) |
3165 | cp = strchr(cp, '.'); | |
3166 | if (cp) | |
d6d4897e | 3167 | screen_number = (u_int)strtonum(cp + 1, 0, 400, NULL); |
5260325f | 3168 | else |
3169 | screen_number = 0; | |
3170 | ||
ef07103c | 3171 | if (x11_saved_proto == NULL) { |
3172 | /* Save protocol name. */ | |
3173 | x11_saved_proto = xstrdup(proto); | |
3174 | /* | |
56964485 | 3175 | * Extract real authentication data and generate fake data |
ef07103c | 3176 | * of the same length. |
3177 | */ | |
3178 | x11_saved_data = xmalloc(data_len); | |
3179 | x11_fake_data = xmalloc(data_len); | |
3180 | for (i = 0; i < data_len; i++) { | |
3181 | if (sscanf(data + 2 * i, "%2x", &value) != 1) | |
3182 | fatal("x11_request_forwarding: bad " | |
3183 | "authentication data: %.100s", data); | |
3184 | if (i % 4 == 0) | |
3185 | rnd = arc4random(); | |
3186 | x11_saved_data[i] = value; | |
3187 | x11_fake_data[i] = rnd & 0xff; | |
3188 | rnd >>= 8; | |
3189 | } | |
3190 | x11_saved_data_len = data_len; | |
3191 | x11_fake_data_len = data_len; | |
3192 | } | |
5260325f | 3193 | |
3194 | /* Convert the fake data into hex. */ | |
ef07103c | 3195 | new_data = tohex(x11_fake_data, data_len); |
5260325f | 3196 | |
3197 | /* Send the request packet. */ | |
0b242b12 | 3198 | if (compat20) { |
3199 | channel_request_start(client_session_id, "x11-req", 0); | |
3200 | packet_put_char(0); /* XXX bool single connection */ | |
3201 | } else { | |
3202 | packet_start(SSH_CMSG_X11_REQUEST_FORWARDING); | |
3203 | } | |
3204 | packet_put_cstring(proto); | |
3205 | packet_put_cstring(new_data); | |
5260325f | 3206 | packet_put_int(screen_number); |
3207 | packet_send(); | |
3208 | packet_write_wait(); | |
3209 | xfree(new_data); | |
8efc0c15 | 3210 | } |
3211 | ||
8e7895b8 | 3212 | |
3213 | /* -- agent forwarding */ | |
3214 | ||
8efc0c15 | 3215 | /* Sends a message to the server to request authentication fd forwarding. */ |
3216 | ||
6ae2364d | 3217 | void |
d5bb9418 | 3218 | auth_request_forwarding(void) |
8efc0c15 | 3219 | { |
5260325f | 3220 | packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING); |
3221 | packet_send(); | |
3222 | packet_write_wait(); | |
8efc0c15 | 3223 | } |