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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> |
c8dfff33 | 53 | #if defined(HAVE_NETDB_H) |
54 | # include <netdb.h> | |
55 | #endif | |
00146caa | 56 | #include <string.h> |
1d3e026f | 57 | #include <termios.h> |
5188ba17 | 58 | #include <unistd.h> |
8efc0c15 | 59 | |
60 | #include "ssh.h" | |
42f11eb2 | 61 | #include "ssh1.h" |
62 | #include "ssh2.h" | |
8efc0c15 | 63 | #include "packet.h" |
64 | #include "xmalloc.h" | |
42f11eb2 | 65 | #include "log.h" |
66 | #include "misc.h" | |
8efc0c15 | 67 | #include "channels.h" |
8efc0c15 | 68 | #include "compat.h" |
42f11eb2 | 69 | #include "canohost.h" |
4c8722d9 | 70 | #include "key.h" |
71 | #include "authfd.h" | |
805e659f | 72 | #include "pathnames.h" |
f49658f5 | 73 | #include "bufaux.h" |
8efc0c15 | 74 | |
8e7895b8 | 75 | /* -- channel core */ |
8efc0c15 | 76 | |
aa3378df | 77 | /* |
78 | * Pointer to an array containing all allocated channels. The array is | |
79 | * dynamically extended as needed. | |
80 | */ | |
719fc62f | 81 | static Channel **channels = NULL; |
8efc0c15 | 82 | |
aa3378df | 83 | /* |
84 | * Size of the channel array. All slots of the array must always be | |
719fc62f | 85 | * initialized (at least the type field); unused slots set to NULL |
aa3378df | 86 | */ |
9a995072 | 87 | static u_int channels_alloc = 0; |
8efc0c15 | 88 | |
aa3378df | 89 | /* |
90 | * Maximum file descriptor value used in any of the channels. This is | |
719fc62f | 91 | * updated in channel_new. |
aa3378df | 92 | */ |
39929cdb | 93 | static int channel_max_fd = 0; |
8efc0c15 | 94 | |
8efc0c15 | 95 | |
8e7895b8 | 96 | /* -- tcp forwarding */ |
8efc0c15 | 97 | |
aa3378df | 98 | /* |
99 | * Data structure for storing which hosts are permitted for forward requests. | |
100 | * The local sides of any remote forwards are stored in this array to prevent | |
101 | * a corrupt remote server from accessing arbitrary TCP/IP ports on our local | |
102 | * network (which might be behind a firewall). | |
103 | */ | |
5260325f | 104 | typedef struct { |
7368a6c8 | 105 | char *host_to_connect; /* Connect to 'host'. */ |
106 | u_short port_to_connect; /* Connect to 'port'. */ | |
107 | u_short listen_port; /* Remote side should listen port number. */ | |
8efc0c15 | 108 | } ForwardPermission; |
109 | ||
2fefbadf | 110 | /* List of all permitted host/port pairs to connect by the user. */ |
8efc0c15 | 111 | static ForwardPermission permitted_opens[SSH_MAX_FORWARDS_PER_DIRECTION]; |
8e7895b8 | 112 | |
2fefbadf | 113 | /* List of all permitted host/port pairs to connect by the admin. */ |
114 | static ForwardPermission permitted_adm_opens[SSH_MAX_FORWARDS_PER_DIRECTION]; | |
115 | ||
116 | /* Number of permitted host/port pairs in the array permitted by the user. */ | |
8efc0c15 | 117 | static int num_permitted_opens = 0; |
2fefbadf | 118 | |
119 | /* Number of permitted host/port pair in the array permitted by the admin. */ | |
120 | static int num_adm_permitted_opens = 0; | |
121 | ||
aa3378df | 122 | /* |
123 | * If this is true, all opens are permitted. This is the case on the server | |
124 | * on which we have to trust the client anyway, and the user could do | |
125 | * anything after logging in anyway. | |
126 | */ | |
8efc0c15 | 127 | static int all_opens_permitted = 0; |
128 | ||
8efc0c15 | 129 | |
8e7895b8 | 130 | /* -- X11 forwarding */ |
42f11eb2 | 131 | |
8e7895b8 | 132 | /* Maximum number of fake X11 displays to try. */ |
133 | #define MAX_DISPLAYS 1000 | |
0490e609 | 134 | |
ef07103c | 135 | /* Saved X11 local (client) display. */ |
136 | static char *x11_saved_display = NULL; | |
137 | ||
8e7895b8 | 138 | /* Saved X11 authentication protocol name. */ |
139 | static char *x11_saved_proto = NULL; | |
8efc0c15 | 140 | |
8e7895b8 | 141 | /* Saved X11 authentication data. This is the real data. */ |
142 | static char *x11_saved_data = NULL; | |
143 | static u_int x11_saved_data_len = 0; | |
144 | ||
145 | /* | |
146 | * Fake X11 authentication data. This is what the server will be sending us; | |
147 | * we should replace any occurrences of this by the real data. | |
148 | */ | |
338eb2ab | 149 | static u_char *x11_fake_data = NULL; |
8e7895b8 | 150 | static u_int x11_fake_data_len; |
151 | ||
152 | ||
153 | /* -- agent forwarding */ | |
8efc0c15 | 154 | |
8e7895b8 | 155 | #define NUM_SOCKS 10 |
156 | ||
8e7895b8 | 157 | /* AF_UNSPEC or AF_INET or AF_INET6 */ |
5e4a7219 | 158 | static int IPv4or6 = AF_UNSPEC; |
8e7895b8 | 159 | |
160 | /* helper */ | |
396c147e | 161 | static void port_open_helper(Channel *c, char *rtype); |
8e7895b8 | 162 | |
163 | /* -- channel core */ | |
7368a6c8 | 164 | |
165 | Channel * | |
b872f7f0 | 166 | channel_by_id(int id) |
7368a6c8 | 167 | { |
168 | Channel *c; | |
719fc62f | 169 | |
9a995072 | 170 | if (id < 0 || (u_int)id >= channels_alloc) { |
b872f7f0 | 171 | logit("channel_by_id: %d: bad id", id); |
7368a6c8 | 172 | return NULL; |
173 | } | |
719fc62f | 174 | c = channels[id]; |
175 | if (c == NULL) { | |
b872f7f0 | 176 | logit("channel_by_id: %d: bad id: channel free", id); |
7368a6c8 | 177 | return NULL; |
178 | } | |
179 | return c; | |
180 | } | |
181 | ||
b872f7f0 | 182 | /* |
183 | * Returns the channel if it is allowed to receive protocol messages. | |
184 | * Private channels, like listening sockets, may not receive messages. | |
185 | */ | |
186 | Channel * | |
187 | channel_lookup(int id) | |
188 | { | |
189 | Channel *c; | |
190 | ||
191 | if ((c = channel_by_id(id)) == NULL) | |
192 | return (NULL); | |
193 | ||
c8e9c167 | 194 | switch (c->type) { |
b872f7f0 | 195 | case SSH_CHANNEL_X11_OPEN: |
196 | case SSH_CHANNEL_LARVAL: | |
197 | case SSH_CHANNEL_CONNECTING: | |
198 | case SSH_CHANNEL_DYNAMIC: | |
199 | case SSH_CHANNEL_OPENING: | |
200 | case SSH_CHANNEL_OPEN: | |
201 | case SSH_CHANNEL_INPUT_DRAINING: | |
202 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
203 | return (c); | |
b872f7f0 | 204 | } |
205 | logit("Non-public channel %d, type %d.", id, c->type); | |
206 | return (NULL); | |
207 | } | |
208 | ||
aa3378df | 209 | /* |
1d1ffb87 | 210 | * Register filedescriptors for a channel, used when allocating a channel or |
0fbe8c74 | 211 | * when the channel consumer/producer is ready, e.g. shell exec'd |
aa3378df | 212 | */ |
396c147e | 213 | static void |
a22aff1f | 214 | channel_register_fds(Channel *c, int rfd, int wfd, int efd, |
215 | int extusage, int nonblock) | |
8efc0c15 | 216 | { |
5260325f | 217 | /* Update the maximum file descriptor value. */ |
39929cdb | 218 | channel_max_fd = MAX(channel_max_fd, rfd); |
219 | channel_max_fd = MAX(channel_max_fd, wfd); | |
220 | channel_max_fd = MAX(channel_max_fd, efd); | |
221 | ||
aa3378df | 222 | /* XXX set close-on-exec -markus */ |
1d1ffb87 | 223 | |
0fbe8c74 | 224 | c->rfd = rfd; |
225 | c->wfd = wfd; | |
226 | c->sock = (rfd == wfd) ? rfd : -1; | |
5e96b616 | 227 | c->ctl_fd = -1; /* XXX: set elsewhere */ |
0fbe8c74 | 228 | c->efd = efd; |
229 | c->extended_usage = extusage; | |
a22aff1f | 230 | |
0ae4fe1d | 231 | /* XXX ugly hack: nonblock is only set by the server */ |
232 | if (nonblock && isatty(c->rfd)) { | |
d7ac5f18 | 233 | debug2("channel %d: rfd %d isatty", c->self, c->rfd); |
0ae4fe1d | 234 | c->isatty = 1; |
235 | if (!isatty(c->wfd)) { | |
94dfb550 | 236 | error("channel %d: wfd %d is not a tty?", |
0ae4fe1d | 237 | c->self, c->wfd); |
238 | } | |
239 | } else { | |
240 | c->isatty = 0; | |
241 | } | |
21c2c5cd | 242 | c->wfd_isatty = isatty(c->wfd); |
0ae4fe1d | 243 | |
a22aff1f | 244 | /* enable nonblocking mode */ |
245 | if (nonblock) { | |
246 | if (rfd != -1) | |
247 | set_nonblock(rfd); | |
248 | if (wfd != -1) | |
249 | set_nonblock(wfd); | |
250 | if (efd != -1) | |
251 | set_nonblock(efd); | |
252 | } | |
0fbe8c74 | 253 | } |
254 | ||
255 | /* | |
256 | * Allocate a new channel object and set its type and socket. This will cause | |
257 | * remote_name to be freed. | |
258 | */ | |
719fc62f | 259 | Channel * |
0fbe8c74 | 260 | channel_new(char *ctype, int type, int rfd, int wfd, int efd, |
f91d9a89 | 261 | u_int window, u_int maxpack, int extusage, char *remote_name, int nonblock) |
0fbe8c74 | 262 | { |
9a995072 | 263 | int found; |
264 | u_int i; | |
0fbe8c74 | 265 | Channel *c; |
5260325f | 266 | |
267 | /* Do initial allocation if this is the first call. */ | |
268 | if (channels_alloc == 0) { | |
269 | channels_alloc = 10; | |
52e3daed | 270 | channels = xcalloc(channels_alloc, sizeof(Channel *)); |
5260325f | 271 | for (i = 0; i < channels_alloc; i++) |
719fc62f | 272 | channels[i] = NULL; |
5260325f | 273 | } |
274 | /* Try to find a free slot where to put the new channel. */ | |
275 | for (found = -1, i = 0; i < channels_alloc; i++) | |
719fc62f | 276 | if (channels[i] == NULL) { |
5260325f | 277 | /* Found a free slot. */ |
9a995072 | 278 | found = (int)i; |
5260325f | 279 | break; |
280 | } | |
9a995072 | 281 | if (found < 0) { |
aa3378df | 282 | /* There are no free slots. Take last+1 slot and expand the array. */ |
5260325f | 283 | found = channels_alloc; |
5df8c731 | 284 | if (channels_alloc > 10000) |
285 | fatal("channel_new: internal error: channels_alloc %d " | |
286 | "too big.", channels_alloc); | |
c5d10563 | 287 | channels = xrealloc(channels, channels_alloc + 10, |
288 | sizeof(Channel *)); | |
20419cc1 | 289 | channels_alloc += 10; |
de273eef | 290 | debug2("channel: expanding %d", channels_alloc); |
5260325f | 291 | for (i = found; i < channels_alloc; i++) |
719fc62f | 292 | channels[i] = NULL; |
5260325f | 293 | } |
719fc62f | 294 | /* Initialize and return new channel. */ |
52e3daed | 295 | c = channels[found] = xcalloc(1, sizeof(Channel)); |
5260325f | 296 | buffer_init(&c->input); |
297 | buffer_init(&c->output); | |
7368a6c8 | 298 | buffer_init(&c->extended); |
70bef40e | 299 | c->ostate = CHAN_OUTPUT_OPEN; |
300 | c->istate = CHAN_INPUT_OPEN; | |
301 | c->flags = 0; | |
a22aff1f | 302 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock); |
5260325f | 303 | c->self = found; |
304 | c->type = type; | |
7368a6c8 | 305 | c->ctype = ctype; |
0b242b12 | 306 | c->local_window = window; |
307 | c->local_window_max = window; | |
308 | c->local_consumed = 0; | |
309 | c->local_maxpacket = maxpack; | |
5260325f | 310 | c->remote_id = -1; |
0d942eff | 311 | c->remote_name = xstrdup(remote_name); |
7368a6c8 | 312 | c->remote_window = 0; |
313 | c->remote_maxpacket = 0; | |
a5f82435 | 314 | c->force_drain = 0; |
ac151b18 | 315 | c->single_connection = 0; |
3cf2be58 | 316 | c->detach_user = NULL; |
8cd0437d | 317 | c->detach_close = 0; |
05ca0898 | 318 | c->confirm = NULL; |
5e96b616 | 319 | c->confirm_ctx = NULL; |
2e73a022 | 320 | c->input_filter = NULL; |
c1c6a032 | 321 | c->output_filter = NULL; |
5260325f | 322 | debug("channel %d: new [%s]", found, remote_name); |
719fc62f | 323 | return c; |
7368a6c8 | 324 | } |
8efc0c15 | 325 | |
489aa2e9 | 326 | static int |
327 | channel_find_maxfd(void) | |
328 | { | |
9a995072 | 329 | u_int i; |
330 | int max = 0; | |
489aa2e9 | 331 | Channel *c; |
332 | ||
333 | for (i = 0; i < channels_alloc; i++) { | |
334 | c = channels[i]; | |
335 | if (c != NULL) { | |
336 | max = MAX(max, c->rfd); | |
337 | max = MAX(max, c->wfd); | |
338 | max = MAX(max, c->efd); | |
339 | } | |
340 | } | |
341 | return max; | |
342 | } | |
343 | ||
344 | int | |
345 | channel_close_fd(int *fdp) | |
346 | { | |
347 | int ret = 0, fd = *fdp; | |
348 | ||
349 | if (fd != -1) { | |
350 | ret = close(fd); | |
351 | *fdp = -1; | |
352 | if (fd == channel_max_fd) | |
353 | channel_max_fd = channel_find_maxfd(); | |
354 | } | |
355 | return ret; | |
356 | } | |
357 | ||
0fbe8c74 | 358 | /* Close all channel fd/socket. */ |
396c147e | 359 | static void |
0fbe8c74 | 360 | channel_close_fds(Channel *c) |
361 | { | |
5e96b616 | 362 | debug3("channel %d: close_fds r %d w %d e %d c %d", |
363 | c->self, c->rfd, c->wfd, c->efd, c->ctl_fd); | |
6fd8622b | 364 | |
489aa2e9 | 365 | channel_close_fd(&c->sock); |
5e96b616 | 366 | channel_close_fd(&c->ctl_fd); |
489aa2e9 | 367 | channel_close_fd(&c->rfd); |
368 | channel_close_fd(&c->wfd); | |
369 | channel_close_fd(&c->efd); | |
0fbe8c74 | 370 | } |
371 | ||
8e7895b8 | 372 | /* Free the channel and close its fd/socket. */ |
8e7895b8 | 373 | void |
374 | channel_free(Channel *c) | |
375 | { | |
376 | char *s; | |
9a995072 | 377 | u_int i, n; |
8e7895b8 | 378 | |
379 | for (n = 0, i = 0; i < channels_alloc; i++) | |
380 | if (channels[i]) | |
381 | n++; | |
9a995072 | 382 | debug("channel %d: free: %s, nchannels %u", c->self, |
8e7895b8 | 383 | c->remote_name ? c->remote_name : "???", n); |
384 | ||
385 | s = channel_open_message(); | |
d7ac5f18 | 386 | debug3("channel %d: status: %s", c->self, s); |
8e7895b8 | 387 | xfree(s); |
388 | ||
8e7895b8 | 389 | if (c->sock != -1) |
390 | shutdown(c->sock, SHUT_RDWR); | |
5e96b616 | 391 | if (c->ctl_fd != -1) |
392 | shutdown(c->ctl_fd, SHUT_RDWR); | |
8e7895b8 | 393 | channel_close_fds(c); |
394 | buffer_free(&c->input); | |
395 | buffer_free(&c->output); | |
396 | buffer_free(&c->extended); | |
397 | if (c->remote_name) { | |
398 | xfree(c->remote_name); | |
399 | c->remote_name = NULL; | |
400 | } | |
401 | channels[c->self] = NULL; | |
402 | xfree(c); | |
403 | } | |
404 | ||
8e7895b8 | 405 | void |
d6746a0b | 406 | channel_free_all(void) |
8e7895b8 | 407 | { |
9a995072 | 408 | u_int i; |
8e7895b8 | 409 | |
d6746a0b | 410 | for (i = 0; i < channels_alloc; i++) |
411 | if (channels[i] != NULL) | |
412 | channel_free(channels[i]); | |
8e7895b8 | 413 | } |
414 | ||
415 | /* | |
416 | * Closes the sockets/fds of all channels. This is used to close extra file | |
417 | * descriptors after a fork. | |
418 | */ | |
8e7895b8 | 419 | void |
d5bb9418 | 420 | channel_close_all(void) |
8e7895b8 | 421 | { |
9a995072 | 422 | u_int i; |
8e7895b8 | 423 | |
424 | for (i = 0; i < channels_alloc; i++) | |
425 | if (channels[i] != NULL) | |
426 | channel_close_fds(channels[i]); | |
427 | } | |
428 | ||
3cf2be58 | 429 | /* |
430 | * Stop listening to channels. | |
431 | */ | |
3cf2be58 | 432 | void |
433 | channel_stop_listening(void) | |
434 | { | |
9a995072 | 435 | u_int i; |
3cf2be58 | 436 | Channel *c; |
437 | ||
438 | for (i = 0; i < channels_alloc; i++) { | |
439 | c = channels[i]; | |
440 | if (c != NULL) { | |
441 | switch (c->type) { | |
442 | case SSH_CHANNEL_AUTH_SOCKET: | |
443 | case SSH_CHANNEL_PORT_LISTENER: | |
444 | case SSH_CHANNEL_RPORT_LISTENER: | |
445 | case SSH_CHANNEL_X11_LISTENER: | |
489aa2e9 | 446 | channel_close_fd(&c->sock); |
3cf2be58 | 447 | channel_free(c); |
448 | break; | |
449 | } | |
450 | } | |
451 | } | |
452 | } | |
453 | ||
8e7895b8 | 454 | /* |
455 | * Returns true if no channel has too much buffered data, and false if one or | |
456 | * more channel is overfull. | |
457 | */ | |
8e7895b8 | 458 | int |
d5bb9418 | 459 | channel_not_very_much_buffered_data(void) |
8e7895b8 | 460 | { |
461 | u_int i; | |
462 | Channel *c; | |
463 | ||
464 | for (i = 0; i < channels_alloc; i++) { | |
465 | c = channels[i]; | |
466 | if (c != NULL && c->type == SSH_CHANNEL_OPEN) { | |
0c139bd1 | 467 | #if 0 |
468 | if (!compat20 && | |
469 | buffer_len(&c->input) > packet_get_maxsize()) { | |
faa483fa | 470 | debug2("channel %d: big input buffer %d", |
8e7895b8 | 471 | c->self, buffer_len(&c->input)); |
472 | return 0; | |
473 | } | |
0c139bd1 | 474 | #endif |
8e7895b8 | 475 | if (buffer_len(&c->output) > packet_get_maxsize()) { |
a27002e5 | 476 | debug2("channel %d: big output buffer %u > %u", |
0c139bd1 | 477 | c->self, buffer_len(&c->output), |
478 | packet_get_maxsize()); | |
8e7895b8 | 479 | return 0; |
480 | } | |
481 | } | |
482 | } | |
483 | return 1; | |
484 | } | |
485 | ||
486 | /* Returns true if any channel is still open. */ | |
8e7895b8 | 487 | int |
d5bb9418 | 488 | channel_still_open(void) |
8e7895b8 | 489 | { |
9a995072 | 490 | u_int i; |
8e7895b8 | 491 | Channel *c; |
492 | ||
493 | for (i = 0; i < channels_alloc; i++) { | |
494 | c = channels[i]; | |
495 | if (c == NULL) | |
496 | continue; | |
497 | switch (c->type) { | |
498 | case SSH_CHANNEL_X11_LISTENER: | |
499 | case SSH_CHANNEL_PORT_LISTENER: | |
500 | case SSH_CHANNEL_RPORT_LISTENER: | |
501 | case SSH_CHANNEL_CLOSED: | |
502 | case SSH_CHANNEL_AUTH_SOCKET: | |
503 | case SSH_CHANNEL_DYNAMIC: | |
504 | case SSH_CHANNEL_CONNECTING: | |
505 | case SSH_CHANNEL_ZOMBIE: | |
506 | continue; | |
507 | case SSH_CHANNEL_LARVAL: | |
508 | if (!compat20) | |
509 | fatal("cannot happen: SSH_CHANNEL_LARVAL"); | |
510 | continue; | |
511 | case SSH_CHANNEL_OPENING: | |
512 | case SSH_CHANNEL_OPEN: | |
513 | case SSH_CHANNEL_X11_OPEN: | |
514 | return 1; | |
515 | case SSH_CHANNEL_INPUT_DRAINING: | |
516 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
517 | if (!compat13) | |
518 | fatal("cannot happen: OUT_DRAIN"); | |
519 | return 1; | |
520 | default: | |
521 | fatal("channel_still_open: bad channel type %d", c->type); | |
522 | /* NOTREACHED */ | |
523 | } | |
524 | } | |
525 | return 0; | |
526 | } | |
527 | ||
528 | /* Returns the id of an open channel suitable for keepaliving */ | |
8e7895b8 | 529 | int |
d5bb9418 | 530 | channel_find_open(void) |
8e7895b8 | 531 | { |
9a995072 | 532 | u_int i; |
8e7895b8 | 533 | Channel *c; |
534 | ||
535 | for (i = 0; i < channels_alloc; i++) { | |
536 | c = channels[i]; | |
13de3560 | 537 | if (c == NULL || c->remote_id < 0) |
8e7895b8 | 538 | continue; |
539 | switch (c->type) { | |
540 | case SSH_CHANNEL_CLOSED: | |
541 | case SSH_CHANNEL_DYNAMIC: | |
542 | case SSH_CHANNEL_X11_LISTENER: | |
543 | case SSH_CHANNEL_PORT_LISTENER: | |
544 | case SSH_CHANNEL_RPORT_LISTENER: | |
545 | case SSH_CHANNEL_OPENING: | |
546 | case SSH_CHANNEL_CONNECTING: | |
547 | case SSH_CHANNEL_ZOMBIE: | |
548 | continue; | |
549 | case SSH_CHANNEL_LARVAL: | |
550 | case SSH_CHANNEL_AUTH_SOCKET: | |
551 | case SSH_CHANNEL_OPEN: | |
552 | case SSH_CHANNEL_X11_OPEN: | |
553 | return i; | |
554 | case SSH_CHANNEL_INPUT_DRAINING: | |
555 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
556 | if (!compat13) | |
557 | fatal("cannot happen: OUT_DRAIN"); | |
558 | return i; | |
559 | default: | |
560 | fatal("channel_find_open: bad channel type %d", c->type); | |
561 | /* NOTREACHED */ | |
562 | } | |
563 | } | |
564 | return -1; | |
565 | } | |
566 | ||
567 | ||
568 | /* | |
569 | * Returns a message describing the currently open forwarded connections, | |
570 | * suitable for sending to the client. The message contains crlf pairs for | |
571 | * newlines. | |
572 | */ | |
8e7895b8 | 573 | char * |
d5bb9418 | 574 | channel_open_message(void) |
8e7895b8 | 575 | { |
576 | Buffer buffer; | |
577 | Channel *c; | |
578 | char buf[1024], *cp; | |
9a995072 | 579 | u_int i; |
8e7895b8 | 580 | |
581 | buffer_init(&buffer); | |
582 | snprintf(buf, sizeof buf, "The following connections are open:\r\n"); | |
583 | buffer_append(&buffer, buf, strlen(buf)); | |
584 | for (i = 0; i < channels_alloc; i++) { | |
585 | c = channels[i]; | |
586 | if (c == NULL) | |
587 | continue; | |
588 | switch (c->type) { | |
589 | case SSH_CHANNEL_X11_LISTENER: | |
590 | case SSH_CHANNEL_PORT_LISTENER: | |
591 | case SSH_CHANNEL_RPORT_LISTENER: | |
592 | case SSH_CHANNEL_CLOSED: | |
593 | case SSH_CHANNEL_AUTH_SOCKET: | |
594 | case SSH_CHANNEL_ZOMBIE: | |
595 | continue; | |
596 | case SSH_CHANNEL_LARVAL: | |
597 | case SSH_CHANNEL_OPENING: | |
598 | case SSH_CHANNEL_CONNECTING: | |
599 | case SSH_CHANNEL_DYNAMIC: | |
600 | case SSH_CHANNEL_OPEN: | |
601 | case SSH_CHANNEL_X11_OPEN: | |
602 | case SSH_CHANNEL_INPUT_DRAINING: | |
603 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
5e96b616 | 604 | snprintf(buf, sizeof buf, |
605 | " #%d %.300s (t%d r%d i%d/%d o%d/%d fd %d/%d cfd %d)\r\n", | |
8e7895b8 | 606 | c->self, c->remote_name, |
607 | c->type, c->remote_id, | |
608 | c->istate, buffer_len(&c->input), | |
609 | c->ostate, buffer_len(&c->output), | |
5e96b616 | 610 | c->rfd, c->wfd, c->ctl_fd); |
8e7895b8 | 611 | buffer_append(&buffer, buf, strlen(buf)); |
612 | continue; | |
613 | default: | |
614 | fatal("channel_open_message: bad channel type %d", c->type); | |
615 | /* NOTREACHED */ | |
616 | } | |
617 | } | |
618 | buffer_append(&buffer, "\0", 1); | |
619 | cp = xstrdup(buffer_ptr(&buffer)); | |
620 | buffer_free(&buffer); | |
621 | return cp; | |
622 | } | |
623 | ||
624 | void | |
625 | channel_send_open(int id) | |
626 | { | |
627 | Channel *c = channel_lookup(id); | |
e1feb9bf | 628 | |
8e7895b8 | 629 | if (c == NULL) { |
bbe88b6d | 630 | logit("channel_send_open: %d: bad id", id); |
8e7895b8 | 631 | return; |
632 | } | |
6226a8f8 | 633 | debug2("channel %d: send open", id); |
8e7895b8 | 634 | packet_start(SSH2_MSG_CHANNEL_OPEN); |
635 | packet_put_cstring(c->ctype); | |
636 | packet_put_int(c->self); | |
637 | packet_put_int(c->local_window); | |
638 | packet_put_int(c->local_maxpacket); | |
639 | packet_send(); | |
640 | } | |
641 | ||
642 | void | |
6226a8f8 | 643 | channel_request_start(int id, char *service, int wantconfirm) |
8e7895b8 | 644 | { |
6226a8f8 | 645 | Channel *c = channel_lookup(id); |
e1feb9bf | 646 | |
8e7895b8 | 647 | if (c == NULL) { |
bbe88b6d | 648 | logit("channel_request_start: %d: unknown channel id", id); |
8e7895b8 | 649 | return; |
650 | } | |
5e96b616 | 651 | debug2("channel %d: request %s confirm %d", id, service, wantconfirm); |
8e7895b8 | 652 | packet_start(SSH2_MSG_CHANNEL_REQUEST); |
653 | packet_put_int(c->remote_id); | |
654 | packet_put_cstring(service); | |
655 | packet_put_char(wantconfirm); | |
656 | } | |
a7137f6b | 657 | |
8e7895b8 | 658 | void |
5e96b616 | 659 | channel_register_confirm(int id, channel_callback_fn *fn, void *ctx) |
8e7895b8 | 660 | { |
661 | Channel *c = channel_lookup(id); | |
e1feb9bf | 662 | |
8e7895b8 | 663 | if (c == NULL) { |
bbe88b6d | 664 | logit("channel_register_comfirm: %d: bad id", id); |
8e7895b8 | 665 | return; |
666 | } | |
05ca0898 | 667 | c->confirm = fn; |
5e96b616 | 668 | c->confirm_ctx = ctx; |
8e7895b8 | 669 | } |
a7137f6b | 670 | |
8e7895b8 | 671 | void |
8cd0437d | 672 | channel_register_cleanup(int id, channel_callback_fn *fn, int do_close) |
8e7895b8 | 673 | { |
b872f7f0 | 674 | Channel *c = channel_by_id(id); |
e1feb9bf | 675 | |
8e7895b8 | 676 | if (c == NULL) { |
bbe88b6d | 677 | logit("channel_register_cleanup: %d: bad id", id); |
8e7895b8 | 678 | return; |
679 | } | |
3cf2be58 | 680 | c->detach_user = fn; |
8cd0437d | 681 | c->detach_close = do_close; |
8e7895b8 | 682 | } |
a7137f6b | 683 | |
8e7895b8 | 684 | void |
685 | channel_cancel_cleanup(int id) | |
686 | { | |
b872f7f0 | 687 | Channel *c = channel_by_id(id); |
e1feb9bf | 688 | |
8e7895b8 | 689 | if (c == NULL) { |
bbe88b6d | 690 | logit("channel_cancel_cleanup: %d: bad id", id); |
8e7895b8 | 691 | return; |
692 | } | |
3cf2be58 | 693 | c->detach_user = NULL; |
8cd0437d | 694 | c->detach_close = 0; |
8e7895b8 | 695 | } |
a7137f6b | 696 | |
8e7895b8 | 697 | void |
c1c6a032 | 698 | channel_register_filter(int id, channel_infilter_fn *ifn, |
699 | channel_outfilter_fn *ofn) | |
8e7895b8 | 700 | { |
701 | Channel *c = channel_lookup(id); | |
e1feb9bf | 702 | |
8e7895b8 | 703 | if (c == NULL) { |
bbe88b6d | 704 | logit("channel_register_filter: %d: bad id", id); |
8e7895b8 | 705 | return; |
706 | } | |
c1c6a032 | 707 | c->input_filter = ifn; |
708 | c->output_filter = ofn; | |
8e7895b8 | 709 | } |
710 | ||
6ae2364d | 711 | void |
8e7895b8 | 712 | channel_set_fds(int id, int rfd, int wfd, int efd, |
399d1ea6 | 713 | int extusage, int nonblock, u_int window_max) |
8efc0c15 | 714 | { |
8e7895b8 | 715 | Channel *c = channel_lookup(id); |
e1feb9bf | 716 | |
8e7895b8 | 717 | if (c == NULL || c->type != SSH_CHANNEL_LARVAL) |
718 | fatal("channel_activate for non-larval channel %d.", id); | |
719 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock); | |
720 | c->type = SSH_CHANNEL_OPEN; | |
399d1ea6 | 721 | c->local_window = c->local_window_max = window_max; |
8e7895b8 | 722 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
723 | packet_put_int(c->remote_id); | |
724 | packet_put_int(c->local_window); | |
725 | packet_send(); | |
8efc0c15 | 726 | } |
727 | ||
aa3378df | 728 | /* |
7368a6c8 | 729 | * 'channel_pre*' are called just before select() to add any bits relevant to |
730 | * channels in the select bitmasks. | |
aa3378df | 731 | */ |
7368a6c8 | 732 | /* |
733 | * 'channel_post*': perform any appropriate operations for channels which | |
734 | * have events pending. | |
735 | */ | |
c8e9c167 | 736 | typedef void chan_fn(Channel *c, fd_set *readset, fd_set *writeset); |
7368a6c8 | 737 | chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE]; |
738 | chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE]; | |
8efc0c15 | 739 | |
ebb90778 | 740 | /* ARGSUSED */ |
396c147e | 741 | static void |
c8e9c167 | 742 | channel_pre_listener(Channel *c, fd_set *readset, fd_set *writeset) |
8efc0c15 | 743 | { |
7368a6c8 | 744 | FD_SET(c->sock, readset); |
745 | } | |
5260325f | 746 | |
ebb90778 | 747 | /* ARGSUSED */ |
396c147e | 748 | static void |
c8e9c167 | 749 | channel_pre_connecting(Channel *c, fd_set *readset, fd_set *writeset) |
97fb6912 | 750 | { |
751 | debug3("channel %d: waiting for connection", c->self); | |
752 | FD_SET(c->sock, writeset); | |
753 | } | |
754 | ||
396c147e | 755 | static void |
c8e9c167 | 756 | channel_pre_open_13(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 757 | { |
758 | if (buffer_len(&c->input) < packet_get_maxsize()) | |
759 | FD_SET(c->sock, readset); | |
760 | if (buffer_len(&c->output) > 0) | |
761 | FD_SET(c->sock, writeset); | |
762 | } | |
5260325f | 763 | |
396c147e | 764 | static void |
c8e9c167 | 765 | channel_pre_open(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 766 | { |
0c0738d5 | 767 | u_int limit = compat20 ? c->remote_window : packet_get_maxsize(); |
5260325f | 768 | |
7e7327a1 | 769 | if (c->istate == CHAN_INPUT_OPEN && |
0c0738d5 | 770 | limit > 0 && |
69d9d413 | 771 | buffer_len(&c->input) < limit && |
772 | buffer_check_alloc(&c->input, CHAN_RBUF)) | |
7e7327a1 | 773 | FD_SET(c->rfd, readset); |
774 | if (c->ostate == CHAN_OUTPUT_OPEN || | |
775 | c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { | |
776 | if (buffer_len(&c->output) > 0) { | |
777 | FD_SET(c->wfd, writeset); | |
778 | } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { | |
d2296ed7 | 779 | if (CHANNEL_EFD_OUTPUT_ACTIVE(c)) |
4e2e5cfd | 780 | debug2("channel %d: obuf_empty delayed efd %d/(%d)", |
781 | c->self, c->efd, buffer_len(&c->extended)); | |
d2296ed7 | 782 | else |
783 | chan_obuf_empty(c); | |
7e7327a1 | 784 | } |
785 | } | |
786 | /** XXX check close conditions, too */ | |
0c0738d5 | 787 | if (compat20 && c->efd != -1) { |
7e7327a1 | 788 | if (c->extended_usage == CHAN_EXTENDED_WRITE && |
789 | buffer_len(&c->extended) > 0) | |
790 | FD_SET(c->efd, writeset); | |
d2296ed7 | 791 | else if (!(c->flags & CHAN_EOF_SENT) && |
792 | c->extended_usage == CHAN_EXTENDED_READ && | |
7e7327a1 | 793 | buffer_len(&c->extended) < c->remote_window) |
794 | FD_SET(c->efd, readset); | |
795 | } | |
5e96b616 | 796 | /* XXX: What about efd? races? */ |
f2107e97 | 797 | if (compat20 && c->ctl_fd != -1 && |
5e96b616 | 798 | c->istate == CHAN_INPUT_OPEN && c->ostate == CHAN_OUTPUT_OPEN) |
799 | FD_SET(c->ctl_fd, readset); | |
7e7327a1 | 800 | } |
801 | ||
ebb90778 | 802 | /* ARGSUSED */ |
396c147e | 803 | static void |
c8e9c167 | 804 | channel_pre_input_draining(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 805 | { |
806 | if (buffer_len(&c->input) == 0) { | |
807 | packet_start(SSH_MSG_CHANNEL_CLOSE); | |
808 | packet_put_int(c->remote_id); | |
809 | packet_send(); | |
810 | c->type = SSH_CHANNEL_CLOSED; | |
d7ac5f18 | 811 | debug2("channel %d: closing after input drain.", c->self); |
7368a6c8 | 812 | } |
813 | } | |
5260325f | 814 | |
ebb90778 | 815 | /* ARGSUSED */ |
396c147e | 816 | static void |
c8e9c167 | 817 | channel_pre_output_draining(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 818 | { |
819 | if (buffer_len(&c->output) == 0) | |
719fc62f | 820 | chan_mark_dead(c); |
6ae2364d | 821 | else |
7368a6c8 | 822 | FD_SET(c->sock, writeset); |
823 | } | |
5260325f | 824 | |
7368a6c8 | 825 | /* |
826 | * This is a special state for X11 authentication spoofing. An opened X11 | |
827 | * connection (when authentication spoofing is being done) remains in this | |
828 | * state until the first packet has been completely read. The authentication | |
829 | * data in that packet is then substituted by the real data if it matches the | |
830 | * fake data, and the channel is put into normal mode. | |
0b242b12 | 831 | * XXX All this happens at the client side. |
8e7895b8 | 832 | * Returns: 0 = need more data, -1 = wrong cookie, 1 = ok |
7368a6c8 | 833 | */ |
396c147e | 834 | static int |
8e7895b8 | 835 | x11_open_helper(Buffer *b) |
7368a6c8 | 836 | { |
1e3b8b07 | 837 | u_char *ucp; |
838 | u_int proto_len, data_len; | |
5260325f | 839 | |
7368a6c8 | 840 | /* Check if the fixed size part of the packet is in buffer. */ |
8e7895b8 | 841 | if (buffer_len(b) < 12) |
7368a6c8 | 842 | return 0; |
843 | ||
844 | /* Parse the lengths of variable-length fields. */ | |
20905a8e | 845 | ucp = buffer_ptr(b); |
7368a6c8 | 846 | if (ucp[0] == 0x42) { /* Byte order MSB first. */ |
847 | proto_len = 256 * ucp[6] + ucp[7]; | |
848 | data_len = 256 * ucp[8] + ucp[9]; | |
849 | } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */ | |
850 | proto_len = ucp[6] + 256 * ucp[7]; | |
851 | data_len = ucp[8] + 256 * ucp[9]; | |
852 | } else { | |
d7ac5f18 | 853 | debug2("Initial X11 packet contains bad byte order byte: 0x%x", |
184eed6a | 854 | ucp[0]); |
7368a6c8 | 855 | return -1; |
856 | } | |
5260325f | 857 | |
7368a6c8 | 858 | /* Check if the whole packet is in buffer. */ |
8e7895b8 | 859 | if (buffer_len(b) < |
7368a6c8 | 860 | 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3)) |
861 | return 0; | |
5260325f | 862 | |
7368a6c8 | 863 | /* Check if authentication protocol matches. */ |
864 | if (proto_len != strlen(x11_saved_proto) || | |
865 | memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) { | |
d7ac5f18 | 866 | debug2("X11 connection uses different authentication protocol."); |
7368a6c8 | 867 | return -1; |
868 | } | |
869 | /* Check if authentication data matches our fake data. */ | |
870 | if (data_len != x11_fake_data_len || | |
871 | memcmp(ucp + 12 + ((proto_len + 3) & ~3), | |
872 | x11_fake_data, x11_fake_data_len) != 0) { | |
d7ac5f18 | 873 | debug2("X11 auth data does not match fake data."); |
7368a6c8 | 874 | return -1; |
875 | } | |
876 | /* Check fake data length */ | |
877 | if (x11_fake_data_len != x11_saved_data_len) { | |
878 | error("X11 fake_data_len %d != saved_data_len %d", | |
879 | x11_fake_data_len, x11_saved_data_len); | |
880 | return -1; | |
881 | } | |
882 | /* | |
883 | * Received authentication protocol and data match | |
884 | * our fake data. Substitute the fake data with real | |
885 | * data. | |
886 | */ | |
887 | memcpy(ucp + 12 + ((proto_len + 3) & ~3), | |
888 | x11_saved_data, x11_saved_data_len); | |
889 | return 1; | |
890 | } | |
5260325f | 891 | |
396c147e | 892 | static void |
c8e9c167 | 893 | channel_pre_x11_open_13(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 894 | { |
8e7895b8 | 895 | int ret = x11_open_helper(&c->output); |
e1feb9bf | 896 | |
7368a6c8 | 897 | if (ret == 1) { |
898 | /* Start normal processing for the channel. */ | |
899 | c->type = SSH_CHANNEL_OPEN; | |
a8be9f80 | 900 | channel_pre_open_13(c, readset, writeset); |
7368a6c8 | 901 | } else if (ret == -1) { |
902 | /* | |
903 | * We have received an X11 connection that has bad | |
904 | * authentication information. | |
905 | */ | |
bbe88b6d | 906 | logit("X11 connection rejected because of wrong authentication."); |
7368a6c8 | 907 | buffer_clear(&c->input); |
908 | buffer_clear(&c->output); | |
489aa2e9 | 909 | channel_close_fd(&c->sock); |
7368a6c8 | 910 | c->sock = -1; |
911 | c->type = SSH_CHANNEL_CLOSED; | |
912 | packet_start(SSH_MSG_CHANNEL_CLOSE); | |
913 | packet_put_int(c->remote_id); | |
914 | packet_send(); | |
915 | } | |
916 | } | |
5260325f | 917 | |
396c147e | 918 | static void |
c8e9c167 | 919 | channel_pre_x11_open(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 920 | { |
8e7895b8 | 921 | int ret = x11_open_helper(&c->output); |
a5f82435 | 922 | |
923 | /* c->force_drain = 1; */ | |
924 | ||
7368a6c8 | 925 | if (ret == 1) { |
926 | c->type = SSH_CHANNEL_OPEN; | |
0c0738d5 | 927 | channel_pre_open(c, readset, writeset); |
7368a6c8 | 928 | } else if (ret == -1) { |
bbe88b6d | 929 | logit("X11 connection rejected because of wrong authentication."); |
d7ac5f18 | 930 | debug2("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate); |
8341f420 | 931 | chan_read_failed(c); |
932 | buffer_clear(&c->input); | |
933 | chan_ibuf_empty(c); | |
934 | buffer_clear(&c->output); | |
935 | /* for proto v1, the peer will send an IEOF */ | |
936 | if (compat20) | |
937 | chan_write_failed(c); | |
938 | else | |
939 | c->type = SSH_CHANNEL_OPEN; | |
d7ac5f18 | 940 | debug2("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate); |
7368a6c8 | 941 | } |
942 | } | |
5260325f | 943 | |
28b9cb4d | 944 | /* try to decode a socks4 header */ |
ebb90778 | 945 | /* ARGSUSED */ |
396c147e | 946 | static int |
c8e9c167 | 947 | channel_decode_socks4(Channel *c, fd_set *readset, fd_set *writeset) |
0490e609 | 948 | { |
661e45a0 | 949 | char *p, *host; |
2ceb8101 | 950 | u_int len, have, i, found; |
184eed6a | 951 | char username[256]; |
0490e609 | 952 | struct { |
953 | u_int8_t version; | |
954 | u_int8_t command; | |
955 | u_int16_t dest_port; | |
28b9cb4d | 956 | struct in_addr dest_addr; |
0490e609 | 957 | } s4_req, s4_rsp; |
958 | ||
28b9cb4d | 959 | debug2("channel %d: decode socks4", c->self); |
53b8fe68 | 960 | |
961 | have = buffer_len(&c->input); | |
962 | len = sizeof(s4_req); | |
963 | if (have < len) | |
964 | return 0; | |
965 | p = buffer_ptr(&c->input); | |
966 | for (found = 0, i = len; i < have; i++) { | |
967 | if (p[i] == '\0') { | |
968 | found = 1; | |
969 | break; | |
970 | } | |
971 | if (i > 1024) { | |
972 | /* the peer is probably sending garbage */ | |
973 | debug("channel %d: decode socks4: too long", | |
974 | c->self); | |
975 | return -1; | |
976 | } | |
977 | } | |
978 | if (!found) | |
979 | return 0; | |
0490e609 | 980 | buffer_get(&c->input, (char *)&s4_req.version, 1); |
981 | buffer_get(&c->input, (char *)&s4_req.command, 1); | |
982 | buffer_get(&c->input, (char *)&s4_req.dest_port, 2); | |
28b9cb4d | 983 | buffer_get(&c->input, (char *)&s4_req.dest_addr, 4); |
53b8fe68 | 984 | have = buffer_len(&c->input); |
0490e609 | 985 | p = buffer_ptr(&c->input); |
986 | len = strlen(p); | |
6683b40f | 987 | debug2("channel %d: decode socks4: user %s/%d", c->self, p, len); |
0490e609 | 988 | if (len > have) |
28b9cb4d | 989 | fatal("channel %d: decode socks4: len %d > have %d", |
0490e609 | 990 | c->self, len, have); |
991 | strlcpy(username, p, sizeof(username)); | |
992 | buffer_consume(&c->input, len); | |
993 | buffer_consume(&c->input, 1); /* trailing '\0' */ | |
994 | ||
28b9cb4d | 995 | host = inet_ntoa(s4_req.dest_addr); |
0490e609 | 996 | strlcpy(c->path, host, sizeof(c->path)); |
997 | c->host_port = ntohs(s4_req.dest_port); | |
184eed6a | 998 | |
d7ac5f18 | 999 | debug2("channel %d: dynamic request: socks4 host %s port %u command %u", |
6683b40f | 1000 | c->self, host, c->host_port, s4_req.command); |
0490e609 | 1001 | |
28b9cb4d | 1002 | if (s4_req.command != 1) { |
1003 | debug("channel %d: cannot handle: socks4 cn %d", | |
1004 | c->self, s4_req.command); | |
1005 | return -1; | |
0490e609 | 1006 | } |
28b9cb4d | 1007 | s4_rsp.version = 0; /* vn: 0 for reply */ |
1008 | s4_rsp.command = 90; /* cd: req granted */ | |
0490e609 | 1009 | s4_rsp.dest_port = 0; /* ignored */ |
28b9cb4d | 1010 | s4_rsp.dest_addr.s_addr = INADDR_ANY; /* ignored */ |
15dd2c4f | 1011 | buffer_append(&c->output, &s4_rsp, sizeof(s4_rsp)); |
28b9cb4d | 1012 | return 1; |
0490e609 | 1013 | } |
1014 | ||
f49658f5 | 1015 | /* try to decode a socks5 header */ |
1016 | #define SSH_SOCKS5_AUTHDONE 0x1000 | |
1017 | #define SSH_SOCKS5_NOAUTH 0x00 | |
1018 | #define SSH_SOCKS5_IPV4 0x01 | |
1019 | #define SSH_SOCKS5_DOMAIN 0x03 | |
1020 | #define SSH_SOCKS5_IPV6 0x04 | |
1021 | #define SSH_SOCKS5_CONNECT 0x01 | |
1022 | #define SSH_SOCKS5_SUCCESS 0x00 | |
1023 | ||
ebb90778 | 1024 | /* ARGSUSED */ |
f49658f5 | 1025 | static int |
c8e9c167 | 1026 | channel_decode_socks5(Channel *c, fd_set *readset, fd_set *writeset) |
f49658f5 | 1027 | { |
1028 | struct { | |
1029 | u_int8_t version; | |
1030 | u_int8_t command; | |
1031 | u_int8_t reserved; | |
1032 | u_int8_t atyp; | |
1033 | } s5_req, s5_rsp; | |
1034 | u_int16_t dest_port; | |
1035 | u_char *p, dest_addr[255+1]; | |
a217e418 | 1036 | u_int have, need, i, found, nmethods, addrlen, af; |
f49658f5 | 1037 | |
1038 | debug2("channel %d: decode socks5", c->self); | |
1039 | p = buffer_ptr(&c->input); | |
1040 | if (p[0] != 0x05) | |
1041 | return -1; | |
1042 | have = buffer_len(&c->input); | |
1043 | if (!(c->flags & SSH_SOCKS5_AUTHDONE)) { | |
1044 | /* format: ver | nmethods | methods */ | |
aff51935 | 1045 | if (have < 2) |
f49658f5 | 1046 | return 0; |
1047 | nmethods = p[1]; | |
1048 | if (have < nmethods + 2) | |
1049 | return 0; | |
1050 | /* look for method: "NO AUTHENTICATION REQUIRED" */ | |
1051 | for (found = 0, i = 2 ; i < nmethods + 2; i++) { | |
1052 | if (p[i] == SSH_SOCKS5_NOAUTH ) { | |
1053 | found = 1; | |
1054 | break; | |
1055 | } | |
1056 | } | |
1057 | if (!found) { | |
1058 | debug("channel %d: method SSH_SOCKS5_NOAUTH not found", | |
1059 | c->self); | |
1060 | return -1; | |
1061 | } | |
1062 | buffer_consume(&c->input, nmethods + 2); | |
1063 | buffer_put_char(&c->output, 0x05); /* version */ | |
1064 | buffer_put_char(&c->output, SSH_SOCKS5_NOAUTH); /* method */ | |
1065 | FD_SET(c->sock, writeset); | |
1066 | c->flags |= SSH_SOCKS5_AUTHDONE; | |
1067 | debug2("channel %d: socks5 auth done", c->self); | |
1068 | return 0; /* need more */ | |
1069 | } | |
1070 | debug2("channel %d: socks5 post auth", c->self); | |
1071 | if (have < sizeof(s5_req)+1) | |
1072 | return 0; /* need more */ | |
5b5f6af7 | 1073 | memcpy(&s5_req, p, sizeof(s5_req)); |
f49658f5 | 1074 | if (s5_req.version != 0x05 || |
1075 | s5_req.command != SSH_SOCKS5_CONNECT || | |
1076 | s5_req.reserved != 0x00) { | |
d7ac5f18 | 1077 | debug2("channel %d: only socks5 connect supported", c->self); |
f49658f5 | 1078 | return -1; |
1079 | } | |
f8cc7664 | 1080 | switch (s5_req.atyp){ |
f49658f5 | 1081 | case SSH_SOCKS5_IPV4: |
1082 | addrlen = 4; | |
1083 | af = AF_INET; | |
1084 | break; | |
1085 | case SSH_SOCKS5_DOMAIN: | |
1086 | addrlen = p[sizeof(s5_req)]; | |
1087 | af = -1; | |
1088 | break; | |
1089 | case SSH_SOCKS5_IPV6: | |
1090 | addrlen = 16; | |
1091 | af = AF_INET6; | |
1092 | break; | |
1093 | default: | |
d7ac5f18 | 1094 | debug2("channel %d: bad socks5 atyp %d", c->self, s5_req.atyp); |
f49658f5 | 1095 | return -1; |
1096 | } | |
a217e418 | 1097 | need = sizeof(s5_req) + addrlen + 2; |
1098 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) | |
1099 | need++; | |
1100 | if (have < need) | |
f49658f5 | 1101 | return 0; |
1102 | buffer_consume(&c->input, sizeof(s5_req)); | |
1103 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) | |
1104 | buffer_consume(&c->input, 1); /* host string length */ | |
1105 | buffer_get(&c->input, (char *)&dest_addr, addrlen); | |
1106 | buffer_get(&c->input, (char *)&dest_port, 2); | |
1107 | dest_addr[addrlen] = '\0'; | |
1108 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) | |
f6be21a0 | 1109 | strlcpy(c->path, (char *)dest_addr, sizeof(c->path)); |
f49658f5 | 1110 | else if (inet_ntop(af, dest_addr, c->path, sizeof(c->path)) == NULL) |
1111 | return -1; | |
1112 | c->host_port = ntohs(dest_port); | |
b6453d99 | 1113 | |
d7ac5f18 | 1114 | debug2("channel %d: dynamic request: socks5 host %s port %u command %u", |
f49658f5 | 1115 | c->self, c->path, c->host_port, s5_req.command); |
1116 | ||
1117 | s5_rsp.version = 0x05; | |
1118 | s5_rsp.command = SSH_SOCKS5_SUCCESS; | |
1119 | s5_rsp.reserved = 0; /* ignored */ | |
1120 | s5_rsp.atyp = SSH_SOCKS5_IPV4; | |
1121 | ((struct in_addr *)&dest_addr)->s_addr = INADDR_ANY; | |
1122 | dest_port = 0; /* ignored */ | |
1123 | ||
15dd2c4f | 1124 | buffer_append(&c->output, &s5_rsp, sizeof(s5_rsp)); |
1125 | buffer_append(&c->output, &dest_addr, sizeof(struct in_addr)); | |
1126 | buffer_append(&c->output, &dest_port, sizeof(dest_port)); | |
f49658f5 | 1127 | return 1; |
1128 | } | |
1129 | ||
28b9cb4d | 1130 | /* dynamic port forwarding */ |
396c147e | 1131 | static void |
c8e9c167 | 1132 | channel_pre_dynamic(Channel *c, fd_set *readset, fd_set *writeset) |
28b9cb4d | 1133 | { |
1134 | u_char *p; | |
2ceb8101 | 1135 | u_int have; |
1136 | int ret; | |
28b9cb4d | 1137 | |
1138 | have = buffer_len(&c->input); | |
639cb8ab | 1139 | c->delayed = 0; |
28b9cb4d | 1140 | debug2("channel %d: pre_dynamic: have %d", c->self, have); |
070adba2 | 1141 | /* buffer_dump(&c->input); */ |
28b9cb4d | 1142 | /* check if the fixed size part of the packet is in buffer. */ |
f49658f5 | 1143 | if (have < 3) { |
28b9cb4d | 1144 | /* need more */ |
1145 | FD_SET(c->sock, readset); | |
1146 | return; | |
1147 | } | |
1148 | /* try to guess the protocol */ | |
1149 | p = buffer_ptr(&c->input); | |
1150 | switch (p[0]) { | |
6683b40f | 1151 | case 0x04: |
1152 | ret = channel_decode_socks4(c, readset, writeset); | |
1153 | break; | |
f49658f5 | 1154 | case 0x05: |
1155 | ret = channel_decode_socks5(c, readset, writeset); | |
1156 | break; | |
28b9cb4d | 1157 | default: |
1158 | ret = -1; | |
1159 | break; | |
1160 | } | |
1161 | if (ret < 0) { | |
719fc62f | 1162 | chan_mark_dead(c); |
28b9cb4d | 1163 | } else if (ret == 0) { |
1164 | debug2("channel %d: pre_dynamic: need more", c->self); | |
1165 | /* need more */ | |
1166 | FD_SET(c->sock, readset); | |
1167 | } else { | |
1168 | /* switch to the next state */ | |
1169 | c->type = SSH_CHANNEL_OPENING; | |
1170 | port_open_helper(c, "direct-tcpip"); | |
1171 | } | |
1172 | } | |
0490e609 | 1173 | |
7368a6c8 | 1174 | /* This is our fake X11 server socket. */ |
ebb90778 | 1175 | /* ARGSUSED */ |
396c147e | 1176 | static void |
c8e9c167 | 1177 | channel_post_x11_listener(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1178 | { |
719fc62f | 1179 | Channel *nc; |
7368a6c8 | 1180 | struct sockaddr addr; |
bcc0381e | 1181 | int newsock; |
7368a6c8 | 1182 | socklen_t addrlen; |
865ac82e | 1183 | char buf[16384], *remote_ipaddr; |
0b242b12 | 1184 | int remote_port; |
7368a6c8 | 1185 | |
1186 | if (FD_ISSET(c->sock, readset)) { | |
1187 | debug("X11 connection requested."); | |
1188 | addrlen = sizeof(addr); | |
1189 | newsock = accept(c->sock, &addr, &addrlen); | |
ac151b18 | 1190 | if (c->single_connection) { |
d7ac5f18 | 1191 | debug2("single_connection: closing X11 listener."); |
ac151b18 | 1192 | channel_close_fd(&c->sock); |
1193 | chan_mark_dead(c); | |
1194 | } | |
7368a6c8 | 1195 | if (newsock < 0) { |
1196 | error("accept: %.100s", strerror(errno)); | |
1197 | return; | |
5260325f | 1198 | } |
bcc0381e | 1199 | set_nodelay(newsock); |
865ac82e | 1200 | remote_ipaddr = get_peer_ipaddr(newsock); |
0b242b12 | 1201 | remote_port = get_peer_port(newsock); |
7368a6c8 | 1202 | snprintf(buf, sizeof buf, "X11 connection from %.200s port %d", |
865ac82e | 1203 | remote_ipaddr, remote_port); |
0b242b12 | 1204 | |
719fc62f | 1205 | nc = channel_new("accepted x11 socket", |
0b242b12 | 1206 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
0d942eff | 1207 | c->local_window_max, c->local_maxpacket, 0, buf, 1); |
0b242b12 | 1208 | if (compat20) { |
1209 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1210 | packet_put_cstring("x11"); | |
719fc62f | 1211 | packet_put_int(nc->self); |
ac151b18 | 1212 | packet_put_int(nc->local_window_max); |
1213 | packet_put_int(nc->local_maxpacket); | |
865ac82e | 1214 | /* originator ipaddr and port */ |
1215 | packet_put_cstring(remote_ipaddr); | |
d0c832f3 | 1216 | if (datafellows & SSH_BUG_X11FWD) { |
d7ac5f18 | 1217 | debug2("ssh2 x11 bug compat mode"); |
d0c832f3 | 1218 | } else { |
1219 | packet_put_int(remote_port); | |
1220 | } | |
0b242b12 | 1221 | packet_send(); |
1222 | } else { | |
1223 | packet_start(SSH_SMSG_X11_OPEN); | |
719fc62f | 1224 | packet_put_int(nc->self); |
8e7895b8 | 1225 | if (packet_get_protocol_flags() & |
1226 | SSH_PROTOFLAG_HOST_IN_FWD_OPEN) | |
449c5ba5 | 1227 | packet_put_cstring(buf); |
0b242b12 | 1228 | packet_send(); |
1229 | } | |
865ac82e | 1230 | xfree(remote_ipaddr); |
8efc0c15 | 1231 | } |
8efc0c15 | 1232 | } |
1233 | ||
396c147e | 1234 | static void |
0490e609 | 1235 | port_open_helper(Channel *c, char *rtype) |
1236 | { | |
1237 | int direct; | |
1238 | char buf[1024]; | |
1239 | char *remote_ipaddr = get_peer_ipaddr(c->sock); | |
29798ed0 | 1240 | int remote_port = get_peer_port(c->sock); |
0490e609 | 1241 | |
1242 | direct = (strcmp(rtype, "direct-tcpip") == 0); | |
1243 | ||
1244 | snprintf(buf, sizeof buf, | |
1245 | "%s: listening port %d for %.100s port %d, " | |
1246 | "connect from %.200s port %d", | |
1247 | rtype, c->listening_port, c->path, c->host_port, | |
1248 | remote_ipaddr, remote_port); | |
1249 | ||
1250 | xfree(c->remote_name); | |
1251 | c->remote_name = xstrdup(buf); | |
1252 | ||
1253 | if (compat20) { | |
1254 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1255 | packet_put_cstring(rtype); | |
1256 | packet_put_int(c->self); | |
1257 | packet_put_int(c->local_window_max); | |
1258 | packet_put_int(c->local_maxpacket); | |
1259 | if (direct) { | |
1260 | /* target host, port */ | |
1261 | packet_put_cstring(c->path); | |
1262 | packet_put_int(c->host_port); | |
1263 | } else { | |
1264 | /* listen address, port */ | |
1265 | packet_put_cstring(c->path); | |
1266 | packet_put_int(c->listening_port); | |
1267 | } | |
1268 | /* originator host and port */ | |
1269 | packet_put_cstring(remote_ipaddr); | |
29798ed0 | 1270 | packet_put_int((u_int)remote_port); |
0490e609 | 1271 | packet_send(); |
1272 | } else { | |
1273 | packet_start(SSH_MSG_PORT_OPEN); | |
1274 | packet_put_int(c->self); | |
1275 | packet_put_cstring(c->path); | |
1276 | packet_put_int(c->host_port); | |
8e7895b8 | 1277 | if (packet_get_protocol_flags() & |
1278 | SSH_PROTOFLAG_HOST_IN_FWD_OPEN) | |
0490e609 | 1279 | packet_put_cstring(c->remote_name); |
1280 | packet_send(); | |
1281 | } | |
1282 | xfree(remote_ipaddr); | |
1283 | } | |
1284 | ||
442aee3a | 1285 | static void |
1286 | channel_set_reuseaddr(int fd) | |
1287 | { | |
1288 | int on = 1; | |
1289 | ||
1290 | /* | |
1291 | * Set socket options. | |
1292 | * Allow local port reuse in TIME_WAIT. | |
1293 | */ | |
1294 | if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1) | |
1295 | error("setsockopt SO_REUSEADDR fd %d: %s", fd, strerror(errno)); | |
1296 | } | |
1297 | ||
aa3378df | 1298 | /* |
7368a6c8 | 1299 | * This socket is listening for connections to a forwarded TCP/IP port. |
aa3378df | 1300 | */ |
ebb90778 | 1301 | /* ARGSUSED */ |
396c147e | 1302 | static void |
c8e9c167 | 1303 | channel_post_port_listener(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1304 | { |
0490e609 | 1305 | Channel *nc; |
7368a6c8 | 1306 | struct sockaddr addr; |
719fc62f | 1307 | int newsock, nextstate; |
7368a6c8 | 1308 | socklen_t addrlen; |
0490e609 | 1309 | char *rtype; |
fa08c86b | 1310 | |
7368a6c8 | 1311 | if (FD_ISSET(c->sock, readset)) { |
1312 | debug("Connection to port %d forwarding " | |
1313 | "to %.100s port %d requested.", | |
1314 | c->listening_port, c->path, c->host_port); | |
0490e609 | 1315 | |
639cb8ab | 1316 | if (c->type == SSH_CHANNEL_RPORT_LISTENER) { |
1317 | nextstate = SSH_CHANNEL_OPENING; | |
1318 | rtype = "forwarded-tcpip"; | |
1319 | } else { | |
1320 | if (c->host_port == 0) { | |
1321 | nextstate = SSH_CHANNEL_DYNAMIC; | |
f3964cb9 | 1322 | rtype = "dynamic-tcpip"; |
639cb8ab | 1323 | } else { |
1324 | nextstate = SSH_CHANNEL_OPENING; | |
1325 | rtype = "direct-tcpip"; | |
1326 | } | |
1327 | } | |
0490e609 | 1328 | |
7368a6c8 | 1329 | addrlen = sizeof(addr); |
1330 | newsock = accept(c->sock, &addr, &addrlen); | |
1331 | if (newsock < 0) { | |
1332 | error("accept: %.100s", strerror(errno)); | |
1333 | return; | |
1334 | } | |
811a6342 | 1335 | set_nodelay(newsock); |
0d942eff | 1336 | nc = channel_new(rtype, nextstate, newsock, newsock, -1, |
1337 | c->local_window_max, c->local_maxpacket, 0, rtype, 1); | |
0490e609 | 1338 | nc->listening_port = c->listening_port; |
1339 | nc->host_port = c->host_port; | |
1340 | strlcpy(nc->path, c->path, sizeof(nc->path)); | |
1341 | ||
639cb8ab | 1342 | if (nextstate == SSH_CHANNEL_DYNAMIC) { |
1343 | /* | |
1344 | * do not call the channel_post handler until | |
1345 | * this flag has been reset by a pre-handler. | |
1346 | * otherwise the FD_ISSET calls might overflow | |
1347 | */ | |
1348 | nc->delayed = 1; | |
1349 | } else { | |
0490e609 | 1350 | port_open_helper(nc, rtype); |
639cb8ab | 1351 | } |
7368a6c8 | 1352 | } |
1353 | } | |
8efc0c15 | 1354 | |
7368a6c8 | 1355 | /* |
1356 | * This is the authentication agent socket listening for connections from | |
1357 | * clients. | |
1358 | */ | |
ebb90778 | 1359 | /* ARGSUSED */ |
396c147e | 1360 | static void |
c8e9c167 | 1361 | channel_post_auth_listener(Channel *c, fd_set *readset, fd_set *writeset) |
8efc0c15 | 1362 | { |
719fc62f | 1363 | Channel *nc; |
1364 | int newsock; | |
5260325f | 1365 | struct sockaddr addr; |
48e671d5 | 1366 | socklen_t addrlen; |
5260325f | 1367 | |
7368a6c8 | 1368 | if (FD_ISSET(c->sock, readset)) { |
1369 | addrlen = sizeof(addr); | |
1370 | newsock = accept(c->sock, &addr, &addrlen); | |
1371 | if (newsock < 0) { | |
1372 | error("accept from auth socket: %.100s", strerror(errno)); | |
1373 | return; | |
1374 | } | |
719fc62f | 1375 | nc = channel_new("accepted auth socket", |
fa08c86b | 1376 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
1377 | c->local_window_max, c->local_maxpacket, | |
0d942eff | 1378 | 0, "accepted auth socket", 1); |
fa08c86b | 1379 | if (compat20) { |
1380 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1381 | packet_put_cstring("auth-agent@openssh.com"); | |
719fc62f | 1382 | packet_put_int(nc->self); |
fa08c86b | 1383 | packet_put_int(c->local_window_max); |
1384 | packet_put_int(c->local_maxpacket); | |
1385 | } else { | |
1386 | packet_start(SSH_SMSG_AGENT_OPEN); | |
719fc62f | 1387 | packet_put_int(nc->self); |
fa08c86b | 1388 | } |
7368a6c8 | 1389 | packet_send(); |
1390 | } | |
1391 | } | |
5260325f | 1392 | |
ebb90778 | 1393 | /* ARGSUSED */ |
396c147e | 1394 | static void |
c8e9c167 | 1395 | channel_post_connecting(Channel *c, fd_set *readset, fd_set *writeset) |
97fb6912 | 1396 | { |
d18e0850 | 1397 | int err = 0; |
8ab2cb35 | 1398 | socklen_t sz = sizeof(err); |
d18e0850 | 1399 | |
97fb6912 | 1400 | if (FD_ISSET(c->sock, writeset)) { |
db518d9b | 1401 | if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, &err, &sz) < 0) { |
d18e0850 | 1402 | err = errno; |
1403 | error("getsockopt SO_ERROR failed"); | |
1404 | } | |
1405 | if (err == 0) { | |
1406 | debug("channel %d: connected", c->self); | |
1407 | c->type = SSH_CHANNEL_OPEN; | |
1408 | if (compat20) { | |
1409 | packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1410 | packet_put_int(c->remote_id); | |
1411 | packet_put_int(c->self); | |
1412 | packet_put_int(c->local_window); | |
1413 | packet_put_int(c->local_maxpacket); | |
1414 | } else { | |
1415 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1416 | packet_put_int(c->remote_id); | |
1417 | packet_put_int(c->self); | |
1418 | } | |
97fb6912 | 1419 | } else { |
d18e0850 | 1420 | debug("channel %d: not connected: %s", |
1421 | c->self, strerror(err)); | |
1422 | if (compat20) { | |
1423 | packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); | |
1424 | packet_put_int(c->remote_id); | |
1425 | packet_put_int(SSH2_OPEN_CONNECT_FAILED); | |
1426 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { | |
1427 | packet_put_cstring(strerror(err)); | |
1428 | packet_put_cstring(""); | |
1429 | } | |
97fb6912 | 1430 | } else { |
d18e0850 | 1431 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
1432 | packet_put_int(c->remote_id); | |
97fb6912 | 1433 | } |
d18e0850 | 1434 | chan_mark_dead(c); |
97fb6912 | 1435 | } |
d18e0850 | 1436 | packet_send(); |
97fb6912 | 1437 | } |
1438 | } | |
1439 | ||
ebb90778 | 1440 | /* ARGSUSED */ |
396c147e | 1441 | static int |
c8e9c167 | 1442 | channel_handle_rfd(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1443 | { |
fa1d7d85 | 1444 | char buf[CHAN_RBUF]; |
7368a6c8 | 1445 | int len; |
1446 | ||
6fd8622b | 1447 | if (c->rfd != -1 && |
7368a6c8 | 1448 | FD_ISSET(c->rfd, readset)) { |
ea8c44d9 | 1449 | errno = 0; |
7368a6c8 | 1450 | len = read(c->rfd, buf, sizeof(buf)); |
0fbe8c74 | 1451 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
1452 | return 1; | |
ea8c44d9 | 1453 | #ifndef PTY_ZEROREAD |
7368a6c8 | 1454 | if (len <= 0) { |
ea8c44d9 | 1455 | #else |
9c04d67d | 1456 | if ((!c->isatty && len <= 0) || |
1457 | (c->isatty && (len < 0 || (len == 0 && errno != 0)))) { | |
ea8c44d9 | 1458 | #endif |
d7ac5f18 | 1459 | debug2("channel %d: read<=0 rfd %d len %d", |
7368a6c8 | 1460 | c->self, c->rfd, len); |
28b9cb4d | 1461 | if (c->type != SSH_CHANNEL_OPEN) { |
d7ac5f18 | 1462 | debug2("channel %d: not open", c->self); |
719fc62f | 1463 | chan_mark_dead(c); |
0490e609 | 1464 | return -1; |
28b9cb4d | 1465 | } else if (compat13) { |
9c50edcf | 1466 | buffer_clear(&c->output); |
7368a6c8 | 1467 | c->type = SSH_CHANNEL_INPUT_DRAINING; |
d7ac5f18 | 1468 | debug2("channel %d: input draining.", c->self); |
7368a6c8 | 1469 | } else { |
1470 | chan_read_failed(c); | |
5260325f | 1471 | } |
7368a6c8 | 1472 | return -1; |
1473 | } | |
6aacefa7 | 1474 | if (c->input_filter != NULL) { |
2e73a022 | 1475 | if (c->input_filter(c, buf, len) == -1) { |
d7ac5f18 | 1476 | debug2("channel %d: filter stops", c->self); |
2e73a022 | 1477 | chan_read_failed(c); |
1478 | } | |
d20f3c9e | 1479 | } else if (c->datagram) { |
1480 | buffer_put_string(&c->input, buf, len); | |
2e73a022 | 1481 | } else { |
1482 | buffer_append(&c->input, buf, len); | |
1483 | } | |
7368a6c8 | 1484 | } |
1485 | return 1; | |
1486 | } | |
a7137f6b | 1487 | |
ebb90778 | 1488 | /* ARGSUSED */ |
396c147e | 1489 | static int |
c8e9c167 | 1490 | channel_handle_wfd(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1491 | { |
95ce5599 | 1492 | struct termios tio; |
c1c6a032 | 1493 | u_char *data = NULL, *buf; |
780a9951 | 1494 | u_int dlen; |
7368a6c8 | 1495 | int len; |
1496 | ||
1497 | /* Send buffered output data to the socket. */ | |
6fd8622b | 1498 | if (c->wfd != -1 && |
7368a6c8 | 1499 | FD_ISSET(c->wfd, writeset) && |
1500 | buffer_len(&c->output) > 0) { | |
c1c6a032 | 1501 | if (c->output_filter != NULL) { |
1502 | if ((buf = c->output_filter(c, &data, &dlen)) == NULL) { | |
1503 | debug2("channel %d: filter stops", c->self); | |
d7b37427 | 1504 | if (c->type != SSH_CHANNEL_OPEN) |
1505 | chan_mark_dead(c); | |
1506 | else | |
1507 | chan_write_failed(c); | |
1508 | return -1; | |
c1c6a032 | 1509 | } |
1510 | } else if (c->datagram) { | |
1511 | buf = data = buffer_get_string(&c->output, &dlen); | |
1512 | } else { | |
1513 | buf = data = buffer_ptr(&c->output); | |
1514 | dlen = buffer_len(&c->output); | |
1515 | } | |
1516 | ||
d20f3c9e | 1517 | if (c->datagram) { |
d20f3c9e | 1518 | /* ignore truncated writes, datagrams might get lost */ |
1519 | c->local_consumed += dlen + 4; | |
c1c6a032 | 1520 | len = write(c->wfd, buf, dlen); |
d20f3c9e | 1521 | xfree(data); |
1522 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) | |
1523 | return 1; | |
1524 | if (len <= 0) { | |
1525 | if (c->type != SSH_CHANNEL_OPEN) | |
1526 | chan_mark_dead(c); | |
1527 | else | |
1528 | chan_write_failed(c); | |
1529 | return -1; | |
1530 | } | |
1531 | return 1; | |
1532 | } | |
64c0ce80 | 1533 | #ifdef _AIX |
aff51935 | 1534 | /* XXX: Later AIX versions can't push as much data to tty */ |
7fbb4189 | 1535 | if (compat20 && c->wfd_isatty) |
1536 | dlen = MIN(dlen, 8*1024); | |
64c0ce80 | 1537 | #endif |
c1c6a032 | 1538 | |
1539 | len = write(c->wfd, buf, dlen); | |
0fbe8c74 | 1540 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
1541 | return 1; | |
7368a6c8 | 1542 | if (len <= 0) { |
28b9cb4d | 1543 | if (c->type != SSH_CHANNEL_OPEN) { |
d7ac5f18 | 1544 | debug2("channel %d: not open", c->self); |
719fc62f | 1545 | chan_mark_dead(c); |
28b9cb4d | 1546 | return -1; |
1547 | } else if (compat13) { | |
9c50edcf | 1548 | buffer_clear(&c->output); |
d7ac5f18 | 1549 | debug2("channel %d: input draining.", c->self); |
7368a6c8 | 1550 | c->type = SSH_CHANNEL_INPUT_DRAINING; |
1551 | } else { | |
1552 | chan_write_failed(c); | |
5260325f | 1553 | } |
7368a6c8 | 1554 | return -1; |
1555 | } | |
c1c6a032 | 1556 | if (compat20 && c->isatty && dlen >= 1 && buf[0] != '\r') { |
0ae4fe1d | 1557 | if (tcgetattr(c->wfd, &tio) == 0 && |
1558 | !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) { | |
1559 | /* | |
1560 | * Simulate echo to reduce the impact of | |
355724fc | 1561 | * traffic analysis. We need to match the |
95ce5599 | 1562 | * size of a SSH2_MSG_CHANNEL_DATA message |
c1c6a032 | 1563 | * (4 byte channel id + buf) |
0ae4fe1d | 1564 | */ |
95ce5599 | 1565 | packet_send_ignore(4 + len); |
0ae4fe1d | 1566 | packet_send(); |
0ae4fe1d | 1567 | } |
1568 | } | |
7368a6c8 | 1569 | buffer_consume(&c->output, len); |
7e7327a1 | 1570 | if (compat20 && len > 0) { |
1571 | c->local_consumed += len; | |
1572 | } | |
1573 | } | |
1574 | return 1; | |
1575 | } | |
a7137f6b | 1576 | |
396c147e | 1577 | static int |
c8e9c167 | 1578 | channel_handle_efd(Channel *c, fd_set *readset, fd_set *writeset) |
7e7327a1 | 1579 | { |
fa1d7d85 | 1580 | char buf[CHAN_RBUF]; |
7e7327a1 | 1581 | int len; |
1582 | ||
8ce64345 | 1583 | /** XXX handle drain efd, too */ |
7e7327a1 | 1584 | if (c->efd != -1) { |
1585 | if (c->extended_usage == CHAN_EXTENDED_WRITE && | |
1586 | FD_ISSET(c->efd, writeset) && | |
1587 | buffer_len(&c->extended) > 0) { | |
1588 | len = write(c->efd, buffer_ptr(&c->extended), | |
1589 | buffer_len(&c->extended)); | |
de273eef | 1590 | debug2("channel %d: written %d to efd %d", |
7e7327a1 | 1591 | c->self, len, c->efd); |
ee55dacf | 1592 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
1593 | return 1; | |
1594 | if (len <= 0) { | |
1595 | debug2("channel %d: closing write-efd %d", | |
1596 | c->self, c->efd); | |
489aa2e9 | 1597 | channel_close_fd(&c->efd); |
ee55dacf | 1598 | } else { |
7e7327a1 | 1599 | buffer_consume(&c->extended, len); |
1600 | c->local_consumed += len; | |
1601 | } | |
1602 | } else if (c->extended_usage == CHAN_EXTENDED_READ && | |
1603 | FD_ISSET(c->efd, readset)) { | |
1604 | len = read(c->efd, buf, sizeof(buf)); | |
de273eef | 1605 | debug2("channel %d: read %d from efd %d", |
184eed6a | 1606 | c->self, len, c->efd); |
ee55dacf | 1607 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
1608 | return 1; | |
1609 | if (len <= 0) { | |
1610 | debug2("channel %d: closing read-efd %d", | |
8ce64345 | 1611 | c->self, c->efd); |
489aa2e9 | 1612 | channel_close_fd(&c->efd); |
ee55dacf | 1613 | } else { |
7e7327a1 | 1614 | buffer_append(&c->extended, buf, len); |
ee55dacf | 1615 | } |
7e7327a1 | 1616 | } |
1617 | } | |
1618 | return 1; | |
1619 | } | |
a7137f6b | 1620 | |
ebb90778 | 1621 | /* ARGSUSED */ |
396c147e | 1622 | static int |
c8e9c167 | 1623 | channel_handle_ctl(Channel *c, fd_set *readset, fd_set *writeset) |
5e96b616 | 1624 | { |
1625 | char buf[16]; | |
1626 | int len; | |
1627 | ||
1628 | /* Monitor control fd to detect if the slave client exits */ | |
1629 | if (c->ctl_fd != -1 && FD_ISSET(c->ctl_fd, readset)) { | |
1630 | len = read(c->ctl_fd, buf, sizeof(buf)); | |
1631 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) | |
1632 | return 1; | |
1633 | if (len <= 0) { | |
1634 | debug2("channel %d: ctl read<=0", c->self); | |
1635 | if (c->type != SSH_CHANNEL_OPEN) { | |
1636 | debug2("channel %d: not open", c->self); | |
1637 | chan_mark_dead(c); | |
1638 | return -1; | |
1639 | } else { | |
1640 | chan_read_failed(c); | |
1641 | chan_write_failed(c); | |
1642 | } | |
1643 | return -1; | |
1644 | } else | |
1645 | fatal("%s: unexpected data on ctl fd", __func__); | |
1646 | } | |
1647 | return 1; | |
1648 | } | |
a7137f6b | 1649 | |
5e96b616 | 1650 | static int |
ee55dacf | 1651 | channel_check_window(Channel *c) |
7e7327a1 | 1652 | { |
28b9cb4d | 1653 | if (c->type == SSH_CHANNEL_OPEN && |
1654 | !(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) && | |
7e7327a1 | 1655 | c->local_window < c->local_window_max/2 && |
1656 | c->local_consumed > 0) { | |
1657 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); | |
1658 | packet_put_int(c->remote_id); | |
1659 | packet_put_int(c->local_consumed); | |
1660 | packet_send(); | |
de273eef | 1661 | debug2("channel %d: window %d sent adjust %d", |
7e7327a1 | 1662 | c->self, c->local_window, |
1663 | c->local_consumed); | |
1664 | c->local_window += c->local_consumed; | |
1665 | c->local_consumed = 0; | |
7368a6c8 | 1666 | } |
1667 | return 1; | |
1668 | } | |
5260325f | 1669 | |
396c147e | 1670 | static void |
c8e9c167 | 1671 | channel_post_open(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1672 | { |
639cb8ab | 1673 | if (c->delayed) |
1674 | return; | |
7368a6c8 | 1675 | channel_handle_rfd(c, readset, writeset); |
1676 | channel_handle_wfd(c, readset, writeset); | |
0c0738d5 | 1677 | if (!compat20) |
639cb8ab | 1678 | return; |
7e7327a1 | 1679 | channel_handle_efd(c, readset, writeset); |
5e96b616 | 1680 | channel_handle_ctl(c, readset, writeset); |
ee55dacf | 1681 | channel_check_window(c); |
7e7327a1 | 1682 | } |
1683 | ||
ebb90778 | 1684 | /* ARGSUSED */ |
396c147e | 1685 | static void |
c8e9c167 | 1686 | channel_post_output_drain_13(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1687 | { |
1688 | int len; | |
e1feb9bf | 1689 | |
7368a6c8 | 1690 | /* Send buffered output data to the socket. */ |
1691 | if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) { | |
1692 | len = write(c->sock, buffer_ptr(&c->output), | |
1693 | buffer_len(&c->output)); | |
1694 | if (len <= 0) | |
9c50edcf | 1695 | buffer_clear(&c->output); |
7368a6c8 | 1696 | else |
1697 | buffer_consume(&c->output, len); | |
1698 | } | |
1699 | } | |
5260325f | 1700 | |
396c147e | 1701 | static void |
7e7327a1 | 1702 | channel_handler_init_20(void) |
1703 | { | |
0c0738d5 | 1704 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open; |
0b242b12 | 1705 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
7e7327a1 | 1706 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; |
fa08c86b | 1707 | channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener; |
0b242b12 | 1708 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
fa08c86b | 1709 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; |
97fb6912 | 1710 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1711 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7e7327a1 | 1712 | |
0c0738d5 | 1713 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
7e7327a1 | 1714 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; |
fa08c86b | 1715 | channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener; |
0b242b12 | 1716 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
fa08c86b | 1717 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; |
97fb6912 | 1718 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 1719 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
7e7327a1 | 1720 | } |
1721 | ||
396c147e | 1722 | static void |
7368a6c8 | 1723 | channel_handler_init_13(void) |
1724 | { | |
1725 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13; | |
1726 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_13; | |
1727 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; | |
1728 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; | |
1729 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; | |
1730 | channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining; | |
1731 | channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining; | |
97fb6912 | 1732 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1733 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7368a6c8 | 1734 | |
0c0738d5 | 1735 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
7368a6c8 | 1736 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
1737 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; | |
1738 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; | |
1739 | channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13; | |
97fb6912 | 1740 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 1741 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
7368a6c8 | 1742 | } |
5260325f | 1743 | |
396c147e | 1744 | static void |
7368a6c8 | 1745 | channel_handler_init_15(void) |
1746 | { | |
0c0738d5 | 1747 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open; |
0b242b12 | 1748 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
7368a6c8 | 1749 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
1750 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; | |
1751 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; | |
97fb6912 | 1752 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1753 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7368a6c8 | 1754 | |
1755 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; | |
1756 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; | |
1757 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; | |
0c0738d5 | 1758 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
97fb6912 | 1759 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 1760 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
7368a6c8 | 1761 | } |
1762 | ||
396c147e | 1763 | static void |
7368a6c8 | 1764 | channel_handler_init(void) |
1765 | { | |
1766 | int i; | |
e1feb9bf | 1767 | |
184eed6a | 1768 | for (i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) { |
7368a6c8 | 1769 | channel_pre[i] = NULL; |
1770 | channel_post[i] = NULL; | |
1771 | } | |
7e7327a1 | 1772 | if (compat20) |
1773 | channel_handler_init_20(); | |
1774 | else if (compat13) | |
7368a6c8 | 1775 | channel_handler_init_13(); |
1776 | else | |
1777 | channel_handler_init_15(); | |
1778 | } | |
1779 | ||
418e724c | 1780 | /* gc dead channels */ |
1781 | static void | |
1782 | channel_garbage_collect(Channel *c) | |
1783 | { | |
1784 | if (c == NULL) | |
1785 | return; | |
1786 | if (c->detach_user != NULL) { | |
8cd0437d | 1787 | if (!chan_is_dead(c, c->detach_close)) |
418e724c | 1788 | return; |
d7ac5f18 | 1789 | debug2("channel %d: gc: notify user", c->self); |
418e724c | 1790 | c->detach_user(c->self, NULL); |
1791 | /* if we still have a callback */ | |
1792 | if (c->detach_user != NULL) | |
1793 | return; | |
d7ac5f18 | 1794 | debug2("channel %d: gc: user detached", c->self); |
418e724c | 1795 | } |
1796 | if (!chan_is_dead(c, 1)) | |
1797 | return; | |
d7ac5f18 | 1798 | debug2("channel %d: garbage collecting", c->self); |
418e724c | 1799 | channel_free(c); |
1800 | } | |
1801 | ||
396c147e | 1802 | static void |
c8e9c167 | 1803 | channel_handler(chan_fn *ftab[], fd_set *readset, fd_set *writeset) |
7368a6c8 | 1804 | { |
1805 | static int did_init = 0; | |
9a995072 | 1806 | u_int i; |
7368a6c8 | 1807 | Channel *c; |
1808 | ||
1809 | if (!did_init) { | |
1810 | channel_handler_init(); | |
1811 | did_init = 1; | |
1812 | } | |
1813 | for (i = 0; i < channels_alloc; i++) { | |
719fc62f | 1814 | c = channels[i]; |
1815 | if (c == NULL) | |
5260325f | 1816 | continue; |
6fd8622b | 1817 | if (ftab[c->type] != NULL) |
1818 | (*ftab[c->type])(c, readset, writeset); | |
418e724c | 1819 | channel_garbage_collect(c); |
8efc0c15 | 1820 | } |
8efc0c15 | 1821 | } |
1822 | ||
8e7895b8 | 1823 | /* |
1824 | * Allocate/update select bitmasks and add any bits relevant to channels in | |
1825 | * select bitmasks. | |
1826 | */ | |
6ae2364d | 1827 | void |
c422989b | 1828 | channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp, |
9a995072 | 1829 | u_int *nallocp, int rekeying) |
7368a6c8 | 1830 | { |
c5d10563 | 1831 | u_int n, sz, nfdset; |
39929cdb | 1832 | |
1833 | n = MAX(*maxfdp, channel_max_fd); | |
1834 | ||
c5d10563 | 1835 | nfdset = howmany(n+1, NFDBITS); |
1836 | /* Explicitly test here, because xrealloc isn't always called */ | |
1837 | if (nfdset && SIZE_T_MAX / nfdset < sizeof(fd_mask)) | |
1838 | fatal("channel_prepare_select: max_fd (%d) is too large", n); | |
1839 | sz = nfdset * sizeof(fd_mask); | |
1840 | ||
489aa2e9 | 1841 | /* perhaps check sz < nalloc/2 and shrink? */ |
1842 | if (*readsetp == NULL || sz > *nallocp) { | |
c5d10563 | 1843 | *readsetp = xrealloc(*readsetp, nfdset, sizeof(fd_mask)); |
1844 | *writesetp = xrealloc(*writesetp, nfdset, sizeof(fd_mask)); | |
489aa2e9 | 1845 | *nallocp = sz; |
39929cdb | 1846 | } |
489aa2e9 | 1847 | *maxfdp = n; |
39929cdb | 1848 | memset(*readsetp, 0, sz); |
1849 | memset(*writesetp, 0, sz); | |
1850 | ||
c422989b | 1851 | if (!rekeying) |
1852 | channel_handler(channel_pre, *readsetp, *writesetp); | |
7368a6c8 | 1853 | } |
1854 | ||
8e7895b8 | 1855 | /* |
1856 | * After select, perform any appropriate operations for channels which have | |
1857 | * events pending. | |
1858 | */ | |
6ae2364d | 1859 | void |
c8e9c167 | 1860 | channel_after_select(fd_set *readset, fd_set *writeset) |
7368a6c8 | 1861 | { |
1862 | channel_handler(channel_post, readset, writeset); | |
1863 | } | |
1864 | ||
8e7895b8 | 1865 | |
39929cdb | 1866 | /* If there is data to send to the connection, enqueue some of it now. */ |
6ae2364d | 1867 | void |
d5bb9418 | 1868 | channel_output_poll(void) |
8efc0c15 | 1869 | { |
7368a6c8 | 1870 | Channel *c; |
9a995072 | 1871 | u_int i, len; |
5260325f | 1872 | |
1873 | for (i = 0; i < channels_alloc; i++) { | |
719fc62f | 1874 | c = channels[i]; |
1875 | if (c == NULL) | |
1876 | continue; | |
48e671d5 | 1877 | |
8e7895b8 | 1878 | /* |
1879 | * We are only interested in channels that can have buffered | |
1880 | * incoming data. | |
1881 | */ | |
48e671d5 | 1882 | if (compat13) { |
7368a6c8 | 1883 | if (c->type != SSH_CHANNEL_OPEN && |
1884 | c->type != SSH_CHANNEL_INPUT_DRAINING) | |
48e671d5 | 1885 | continue; |
1886 | } else { | |
7368a6c8 | 1887 | if (c->type != SSH_CHANNEL_OPEN) |
48e671d5 | 1888 | continue; |
48e671d5 | 1889 | } |
e78a59f5 | 1890 | if (compat20 && |
1891 | (c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) { | |
ee55dacf | 1892 | /* XXX is this true? */ |
418e724c | 1893 | debug3("channel %d: will not send data after close", c->self); |
7e7327a1 | 1894 | continue; |
1895 | } | |
5260325f | 1896 | |
1897 | /* Get the amount of buffered data for this channel. */ | |
ee55dacf | 1898 | if ((c->istate == CHAN_INPUT_OPEN || |
1899 | c->istate == CHAN_INPUT_WAIT_DRAIN) && | |
1900 | (len = buffer_len(&c->input)) > 0) { | |
d20f3c9e | 1901 | if (c->datagram) { |
1902 | if (len > 0) { | |
1903 | u_char *data; | |
1904 | u_int dlen; | |
1905 | ||
1906 | data = buffer_get_string(&c->input, | |
1907 | &dlen); | |
1908 | packet_start(SSH2_MSG_CHANNEL_DATA); | |
1909 | packet_put_int(c->remote_id); | |
1910 | packet_put_string(data, dlen); | |
1911 | packet_send(); | |
1912 | c->remote_window -= dlen + 4; | |
1913 | xfree(data); | |
1914 | } | |
1915 | continue; | |
1916 | } | |
8e7895b8 | 1917 | /* |
1918 | * Send some data for the other side over the secure | |
1919 | * connection. | |
1920 | */ | |
7e7327a1 | 1921 | if (compat20) { |
1922 | if (len > c->remote_window) | |
1923 | len = c->remote_window; | |
1924 | if (len > c->remote_maxpacket) | |
1925 | len = c->remote_maxpacket; | |
5260325f | 1926 | } else { |
7e7327a1 | 1927 | if (packet_is_interactive()) { |
1928 | if (len > 1024) | |
1929 | len = 512; | |
1930 | } else { | |
1931 | /* Keep the packets at reasonable size. */ | |
1932 | if (len > packet_get_maxsize()/2) | |
1933 | len = packet_get_maxsize()/2; | |
1934 | } | |
5260325f | 1935 | } |
7368a6c8 | 1936 | if (len > 0) { |
7e7327a1 | 1937 | packet_start(compat20 ? |
1938 | SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA); | |
7368a6c8 | 1939 | packet_put_int(c->remote_id); |
1940 | packet_put_string(buffer_ptr(&c->input), len); | |
1941 | packet_send(); | |
1942 | buffer_consume(&c->input, len); | |
1943 | c->remote_window -= len; | |
7368a6c8 | 1944 | } |
1945 | } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) { | |
5260325f | 1946 | if (compat13) |
1947 | fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3"); | |
aa3378df | 1948 | /* |
1949 | * input-buffer is empty and read-socket shutdown: | |
d2296ed7 | 1950 | * tell peer, that we will not send more data: send IEOF. |
1951 | * hack for extended data: delay EOF if EFD still in use. | |
aa3378df | 1952 | */ |
d2296ed7 | 1953 | if (CHANNEL_EFD_INPUT_ACTIVE(c)) |
4e2e5cfd | 1954 | debug2("channel %d: ibuf_empty delayed efd %d/(%d)", |
1955 | c->self, c->efd, buffer_len(&c->extended)); | |
d2296ed7 | 1956 | else |
1957 | chan_ibuf_empty(c); | |
5260325f | 1958 | } |
7e7327a1 | 1959 | /* Send extended data, i.e. stderr */ |
1960 | if (compat20 && | |
d2296ed7 | 1961 | !(c->flags & CHAN_EOF_SENT) && |
7e7327a1 | 1962 | c->remote_window > 0 && |
1963 | (len = buffer_len(&c->extended)) > 0 && | |
1964 | c->extended_usage == CHAN_EXTENDED_READ) { | |
f91d9a89 | 1965 | debug2("channel %d: rwin %u elen %u euse %d", |
ee55dacf | 1966 | c->self, c->remote_window, buffer_len(&c->extended), |
1967 | c->extended_usage); | |
7e7327a1 | 1968 | if (len > c->remote_window) |
1969 | len = c->remote_window; | |
1970 | if (len > c->remote_maxpacket) | |
1971 | len = c->remote_maxpacket; | |
1972 | packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA); | |
1973 | packet_put_int(c->remote_id); | |
1974 | packet_put_int(SSH2_EXTENDED_DATA_STDERR); | |
1975 | packet_put_string(buffer_ptr(&c->extended), len); | |
1976 | packet_send(); | |
1977 | buffer_consume(&c->extended, len); | |
1978 | c->remote_window -= len; | |
ee55dacf | 1979 | debug2("channel %d: sent ext data %d", c->self, len); |
7e7327a1 | 1980 | } |
8efc0c15 | 1981 | } |
8efc0c15 | 1982 | } |
1983 | ||
8e7895b8 | 1984 | |
1985 | /* -- protocol input */ | |
04aa9e67 | 1986 | |
1987 | /* ARGSUSED */ | |
6ae2364d | 1988 | void |
7819b5c3 | 1989 | channel_input_data(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 1990 | { |
48e671d5 | 1991 | int id; |
5260325f | 1992 | char *data; |
1e3b8b07 | 1993 | u_int data_len; |
7368a6c8 | 1994 | Channel *c; |
5260325f | 1995 | |
1996 | /* Get the channel number and verify it. */ | |
48e671d5 | 1997 | id = packet_get_int(); |
7368a6c8 | 1998 | c = channel_lookup(id); |
1999 | if (c == NULL) | |
48e671d5 | 2000 | packet_disconnect("Received data for nonexistent channel %d.", id); |
5260325f | 2001 | |
2002 | /* Ignore any data for non-open channels (might happen on close) */ | |
7368a6c8 | 2003 | if (c->type != SSH_CHANNEL_OPEN && |
2004 | c->type != SSH_CHANNEL_X11_OPEN) | |
48e671d5 | 2005 | return; |
2006 | ||
5260325f | 2007 | /* Get the data. */ |
2008 | data = packet_get_string(&data_len); | |
7368a6c8 | 2009 | |
7741e239 | 2010 | /* |
2011 | * Ignore data for protocol > 1.3 if output end is no longer open. | |
2012 | * For protocol 2 the sending side is reducing its window as it sends | |
2013 | * data, so we must 'fake' consumption of the data in order to ensure | |
2014 | * that window updates are sent back. Otherwise the connection might | |
2015 | * deadlock. | |
2016 | */ | |
2017 | if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN) { | |
2018 | if (compat20) { | |
2019 | c->local_window -= data_len; | |
2020 | c->local_consumed += data_len; | |
2021 | } | |
2022 | xfree(data); | |
2023 | return; | |
2024 | } | |
2025 | ||
6aacefa7 | 2026 | if (compat20) { |
7e7327a1 | 2027 | if (data_len > c->local_maxpacket) { |
bbe88b6d | 2028 | logit("channel %d: rcvd big packet %d, maxpack %d", |
7e7327a1 | 2029 | c->self, data_len, c->local_maxpacket); |
2030 | } | |
2031 | if (data_len > c->local_window) { | |
bbe88b6d | 2032 | logit("channel %d: rcvd too much data %d, win %d", |
7e7327a1 | 2033 | c->self, data_len, c->local_window); |
2034 | xfree(data); | |
2035 | return; | |
2036 | } | |
2037 | c->local_window -= data_len; | |
7e7327a1 | 2038 | } |
95500969 | 2039 | packet_check_eom(); |
d20f3c9e | 2040 | if (c->datagram) |
2041 | buffer_put_string(&c->output, data, data_len); | |
2042 | else | |
2043 | buffer_append(&c->output, data, data_len); | |
5260325f | 2044 | xfree(data); |
8efc0c15 | 2045 | } |
8e7895b8 | 2046 | |
04aa9e67 | 2047 | /* ARGSUSED */ |
6ae2364d | 2048 | void |
7819b5c3 | 2049 | channel_input_extended_data(int type, u_int32_t seq, void *ctxt) |
7e7327a1 | 2050 | { |
2051 | int id; | |
7e7327a1 | 2052 | char *data; |
a594fa74 | 2053 | u_int data_len, tcode; |
7e7327a1 | 2054 | Channel *c; |
2055 | ||
2056 | /* Get the channel number and verify it. */ | |
2057 | id = packet_get_int(); | |
2058 | c = channel_lookup(id); | |
2059 | ||
2060 | if (c == NULL) | |
2061 | packet_disconnect("Received extended_data for bad channel %d.", id); | |
2062 | if (c->type != SSH_CHANNEL_OPEN) { | |
bbe88b6d | 2063 | logit("channel %d: ext data for non open", id); |
7e7327a1 | 2064 | return; |
2065 | } | |
d2296ed7 | 2066 | if (c->flags & CHAN_EOF_RCVD) { |
2067 | if (datafellows & SSH_BUG_EXTEOF) | |
2068 | debug("channel %d: accepting ext data after eof", id); | |
2069 | else | |
2070 | packet_disconnect("Received extended_data after EOF " | |
2071 | "on channel %d.", id); | |
2072 | } | |
7e7327a1 | 2073 | tcode = packet_get_int(); |
2074 | if (c->efd == -1 || | |
2075 | c->extended_usage != CHAN_EXTENDED_WRITE || | |
2076 | tcode != SSH2_EXTENDED_DATA_STDERR) { | |
bbe88b6d | 2077 | logit("channel %d: bad ext data", c->self); |
7e7327a1 | 2078 | return; |
2079 | } | |
2080 | data = packet_get_string(&data_len); | |
95500969 | 2081 | packet_check_eom(); |
7e7327a1 | 2082 | if (data_len > c->local_window) { |
bbe88b6d | 2083 | logit("channel %d: rcvd too much extended_data %d, win %d", |
7e7327a1 | 2084 | c->self, data_len, c->local_window); |
2085 | xfree(data); | |
2086 | return; | |
2087 | } | |
de273eef | 2088 | debug2("channel %d: rcvd ext data %d", c->self, data_len); |
7e7327a1 | 2089 | c->local_window -= data_len; |
2090 | buffer_append(&c->extended, data, data_len); | |
2091 | xfree(data); | |
2092 | } | |
2093 | ||
04aa9e67 | 2094 | /* ARGSUSED */ |
6ae2364d | 2095 | void |
7819b5c3 | 2096 | channel_input_ieof(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 2097 | { |
2098 | int id; | |
2099 | Channel *c; | |
2100 | ||
7368a6c8 | 2101 | id = packet_get_int(); |
95500969 | 2102 | packet_check_eom(); |
7368a6c8 | 2103 | c = channel_lookup(id); |
2104 | if (c == NULL) | |
2105 | packet_disconnect("Received ieof for nonexistent channel %d.", id); | |
2106 | chan_rcvd_ieof(c); | |
a5f82435 | 2107 | |
2108 | /* XXX force input close */ | |
8341f420 | 2109 | if (c->force_drain && c->istate == CHAN_INPUT_OPEN) { |
a5f82435 | 2110 | debug("channel %d: FORCE input drain", c->self); |
2111 | c->istate = CHAN_INPUT_WAIT_DRAIN; | |
32e7d71f | 2112 | if (buffer_len(&c->input) == 0) |
2113 | chan_ibuf_empty(c); | |
a5f82435 | 2114 | } |
2115 | ||
7368a6c8 | 2116 | } |
8efc0c15 | 2117 | |
04aa9e67 | 2118 | /* ARGSUSED */ |
6ae2364d | 2119 | void |
7819b5c3 | 2120 | channel_input_close(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2121 | { |
7368a6c8 | 2122 | int id; |
2123 | Channel *c; | |
5260325f | 2124 | |
7368a6c8 | 2125 | id = packet_get_int(); |
95500969 | 2126 | packet_check_eom(); |
7368a6c8 | 2127 | c = channel_lookup(id); |
2128 | if (c == NULL) | |
2129 | packet_disconnect("Received close for nonexistent channel %d.", id); | |
aa3378df | 2130 | |
2131 | /* | |
2132 | * Send a confirmation that we have closed the channel and no more | |
2133 | * data is coming for it. | |
2134 | */ | |
5260325f | 2135 | packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION); |
7368a6c8 | 2136 | packet_put_int(c->remote_id); |
5260325f | 2137 | packet_send(); |
2138 | ||
aa3378df | 2139 | /* |
2140 | * If the channel is in closed state, we have sent a close request, | |
2141 | * and the other side will eventually respond with a confirmation. | |
2142 | * Thus, we cannot free the channel here, because then there would be | |
2143 | * no-one to receive the confirmation. The channel gets freed when | |
2144 | * the confirmation arrives. | |
2145 | */ | |
7368a6c8 | 2146 | if (c->type != SSH_CHANNEL_CLOSED) { |
aa3378df | 2147 | /* |
2148 | * Not a closed channel - mark it as draining, which will | |
2149 | * cause it to be freed later. | |
2150 | */ | |
9c50edcf | 2151 | buffer_clear(&c->input); |
7368a6c8 | 2152 | c->type = SSH_CHANNEL_OUTPUT_DRAINING; |
5260325f | 2153 | } |
8efc0c15 | 2154 | } |
2155 | ||
7368a6c8 | 2156 | /* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */ |
04aa9e67 | 2157 | /* ARGSUSED */ |
6ae2364d | 2158 | void |
7819b5c3 | 2159 | channel_input_oclose(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2160 | { |
7368a6c8 | 2161 | int id = packet_get_int(); |
2162 | Channel *c = channel_lookup(id); | |
a8a21a53 | 2163 | |
95500969 | 2164 | packet_check_eom(); |
7368a6c8 | 2165 | if (c == NULL) |
2166 | packet_disconnect("Received oclose for nonexistent channel %d.", id); | |
2167 | chan_rcvd_oclose(c); | |
8efc0c15 | 2168 | } |
2169 | ||
04aa9e67 | 2170 | /* ARGSUSED */ |
6ae2364d | 2171 | void |
7819b5c3 | 2172 | channel_input_close_confirmation(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 2173 | { |
2174 | int id = packet_get_int(); | |
2175 | Channel *c = channel_lookup(id); | |
2176 | ||
95500969 | 2177 | packet_check_eom(); |
7368a6c8 | 2178 | if (c == NULL) |
2179 | packet_disconnect("Received close confirmation for " | |
2180 | "out-of-range channel %d.", id); | |
2181 | if (c->type != SSH_CHANNEL_CLOSED) | |
2182 | packet_disconnect("Received close confirmation for " | |
2183 | "non-closed channel %d (type %d).", id, c->type); | |
719fc62f | 2184 | channel_free(c); |
7368a6c8 | 2185 | } |
8efc0c15 | 2186 | |
04aa9e67 | 2187 | /* ARGSUSED */ |
6ae2364d | 2188 | void |
7819b5c3 | 2189 | channel_input_open_confirmation(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2190 | { |
7368a6c8 | 2191 | int id, remote_id; |
2192 | Channel *c; | |
5260325f | 2193 | |
7368a6c8 | 2194 | id = packet_get_int(); |
2195 | c = channel_lookup(id); | |
5260325f | 2196 | |
7368a6c8 | 2197 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) |
2198 | packet_disconnect("Received open confirmation for " | |
2199 | "non-opening channel %d.", id); | |
2200 | remote_id = packet_get_int(); | |
aa3378df | 2201 | /* Record the remote channel number and mark that the channel is now open. */ |
7368a6c8 | 2202 | c->remote_id = remote_id; |
2203 | c->type = SSH_CHANNEL_OPEN; | |
7e7327a1 | 2204 | |
2205 | if (compat20) { | |
2206 | c->remote_window = packet_get_int(); | |
2207 | c->remote_maxpacket = packet_get_int(); | |
05ca0898 | 2208 | if (c->confirm) { |
de273eef | 2209 | debug2("callback start"); |
5e96b616 | 2210 | c->confirm(c->self, c->confirm_ctx); |
de273eef | 2211 | debug2("callback done"); |
7e7327a1 | 2212 | } |
d7ac5f18 | 2213 | debug2("channel %d: open confirm rwindow %u rmax %u", c->self, |
7e7327a1 | 2214 | c->remote_window, c->remote_maxpacket); |
2215 | } | |
95500969 | 2216 | packet_check_eom(); |
8efc0c15 | 2217 | } |
2218 | ||
396c147e | 2219 | static char * |
d18e0850 | 2220 | reason2txt(int reason) |
2221 | { | |
6aacefa7 | 2222 | switch (reason) { |
d18e0850 | 2223 | case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED: |
2224 | return "administratively prohibited"; | |
2225 | case SSH2_OPEN_CONNECT_FAILED: | |
2226 | return "connect failed"; | |
2227 | case SSH2_OPEN_UNKNOWN_CHANNEL_TYPE: | |
2228 | return "unknown channel type"; | |
2229 | case SSH2_OPEN_RESOURCE_SHORTAGE: | |
2230 | return "resource shortage"; | |
2231 | } | |
7e8c18e9 | 2232 | return "unknown reason"; |
d18e0850 | 2233 | } |
2234 | ||
04aa9e67 | 2235 | /* ARGSUSED */ |
6ae2364d | 2236 | void |
7819b5c3 | 2237 | channel_input_open_failure(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2238 | { |
02a024dd | 2239 | int id, reason; |
2240 | char *msg = NULL, *lang = NULL; | |
7368a6c8 | 2241 | Channel *c; |
5260325f | 2242 | |
7368a6c8 | 2243 | id = packet_get_int(); |
2244 | c = channel_lookup(id); | |
2245 | ||
2246 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) | |
2247 | packet_disconnect("Received open failure for " | |
2248 | "non-opening channel %d.", id); | |
7e7327a1 | 2249 | if (compat20) { |
02a024dd | 2250 | reason = packet_get_int(); |
fbe90f7b | 2251 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { |
02a024dd | 2252 | msg = packet_get_string(NULL); |
2253 | lang = packet_get_string(NULL); | |
2254 | } | |
bbe88b6d | 2255 | logit("channel %d: open failed: %s%s%s", id, |
d18e0850 | 2256 | reason2txt(reason), msg ? ": ": "", msg ? msg : ""); |
02a024dd | 2257 | if (msg != NULL) |
2258 | xfree(msg); | |
2259 | if (lang != NULL) | |
2260 | xfree(lang); | |
7e7327a1 | 2261 | } |
95500969 | 2262 | packet_check_eom(); |
5260325f | 2263 | /* Free the channel. This will also close the socket. */ |
719fc62f | 2264 | channel_free(c); |
8efc0c15 | 2265 | } |
2266 | ||
04aa9e67 | 2267 | /* ARGSUSED */ |
8e7895b8 | 2268 | void |
7819b5c3 | 2269 | channel_input_window_adjust(int type, u_int32_t seq, void *ctxt) |
8e7895b8 | 2270 | { |
2271 | Channel *c; | |
f91d9a89 | 2272 | int id; |
2273 | u_int adjust; | |
3ffc6336 | 2274 | |
8e7895b8 | 2275 | if (!compat20) |
2276 | return; | |
8efc0c15 | 2277 | |
8e7895b8 | 2278 | /* Get the channel number and verify it. */ |
2279 | id = packet_get_int(); | |
2280 | c = channel_lookup(id); | |
2281 | ||
b872f7f0 | 2282 | if (c == NULL) { |
2283 | logit("Received window adjust for non-open channel %d.", id); | |
8e7895b8 | 2284 | return; |
2285 | } | |
2286 | adjust = packet_get_int(); | |
95500969 | 2287 | packet_check_eom(); |
f91d9a89 | 2288 | debug2("channel %d: rcvd adjust %u", id, adjust); |
8e7895b8 | 2289 | c->remote_window += adjust; |
2290 | } | |
2291 | ||
04aa9e67 | 2292 | /* ARGSUSED */ |
8e7895b8 | 2293 | void |
7819b5c3 | 2294 | channel_input_port_open(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2295 | { |
8e7895b8 | 2296 | Channel *c = NULL; |
2297 | u_short host_port; | |
2298 | char *host, *originator_string; | |
2299 | int remote_id, sock = -1; | |
5260325f | 2300 | |
8e7895b8 | 2301 | remote_id = packet_get_int(); |
2302 | host = packet_get_string(NULL); | |
2303 | host_port = packet_get_int(); | |
2304 | ||
2305 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) { | |
2306 | originator_string = packet_get_string(NULL); | |
2307 | } else { | |
2308 | originator_string = xstrdup("unknown (remote did not supply name)"); | |
2309 | } | |
95500969 | 2310 | packet_check_eom(); |
8e7895b8 | 2311 | sock = channel_connect_to(host, host_port); |
2312 | if (sock != -1) { | |
2313 | c = channel_new("connected socket", | |
2314 | SSH_CHANNEL_CONNECTING, sock, sock, -1, 0, 0, 0, | |
2315 | originator_string, 1); | |
3a0d3d54 | 2316 | c->remote_id = remote_id; |
5260325f | 2317 | } |
0d942eff | 2318 | xfree(originator_string); |
8e7895b8 | 2319 | if (c == NULL) { |
2320 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
2321 | packet_put_int(remote_id); | |
2322 | packet_send(); | |
2323 | } | |
2324 | xfree(host); | |
8efc0c15 | 2325 | } |
2326 | ||
8e7895b8 | 2327 | |
2328 | /* -- tcp forwarding */ | |
2329 | ||
5e4a7219 | 2330 | void |
2331 | channel_set_af(int af) | |
2332 | { | |
2333 | IPv4or6 = af; | |
2334 | } | |
2335 | ||
5641aefa | 2336 | static int |
2337 | channel_setup_fwd_listener(int type, const char *listen_addr, u_short listen_port, | |
2338 | const char *host_to_connect, u_short port_to_connect, int gateway_ports) | |
8efc0c15 | 2339 | { |
719fc62f | 2340 | Channel *c; |
442aee3a | 2341 | int sock, r, success = 0, wildcard = 0, is_client; |
48e671d5 | 2342 | struct addrinfo hints, *ai, *aitop; |
3867aa0a | 2343 | const char *host, *addr; |
5641aefa | 2344 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
5260325f | 2345 | |
5641aefa | 2346 | host = (type == SSH_CHANNEL_RPORT_LISTENER) ? |
2347 | listen_addr : host_to_connect; | |
3867aa0a | 2348 | is_client = (type == SSH_CHANNEL_PORT_LISTENER); |
02a024dd | 2349 | |
5641aefa | 2350 | if (host == NULL) { |
2351 | error("No forward host name."); | |
38946c65 | 2352 | return 0; |
fa08c86b | 2353 | } |
719fc62f | 2354 | if (strlen(host) > SSH_CHANNEL_PATH_LEN - 1) { |
02a024dd | 2355 | error("Forward host name too long."); |
38946c65 | 2356 | return 0; |
02a024dd | 2357 | } |
5260325f | 2358 | |
3867aa0a | 2359 | /* |
2360 | * Determine whether or not a port forward listens to loopback, | |
f8cc7664 | 2361 | * specified address or wildcard. On the client, a specified bind |
2362 | * address will always override gateway_ports. On the server, a | |
2363 | * gateway_ports of 1 (``yes'') will override the client's | |
2364 | * specification and force a wildcard bind, whereas a value of 2 | |
2365 | * (``clientspecified'') will bind to whatever address the client | |
3867aa0a | 2366 | * asked for. |
2367 | * | |
2368 | * Special-case listen_addrs are: | |
2369 | * | |
2370 | * "0.0.0.0" -> wildcard v4/v6 if SSH_OLD_FORWARD_ADDR | |
2371 | * "" (empty string), "*" -> wildcard v4/v6 | |
2372 | * "localhost" -> loopback v4/v6 | |
2373 | */ | |
2374 | addr = NULL; | |
2375 | if (listen_addr == NULL) { | |
2376 | /* No address specified: default to gateway_ports setting */ | |
2377 | if (gateway_ports) | |
2378 | wildcard = 1; | |
2379 | } else if (gateway_ports || is_client) { | |
2380 | if (((datafellows & SSH_OLD_FORWARD_ADDR) && | |
2381 | strcmp(listen_addr, "0.0.0.0") == 0) || | |
2382 | *listen_addr == '\0' || strcmp(listen_addr, "*") == 0 || | |
2383 | (!is_client && gateway_ports == 1)) | |
2384 | wildcard = 1; | |
2385 | else if (strcmp(listen_addr, "localhost") != 0) | |
2386 | addr = listen_addr; | |
2387 | } | |
2388 | ||
2389 | debug3("channel_setup_fwd_listener: type %d wildcard %d addr %s", | |
2390 | type, wildcard, (addr == NULL) ? "NULL" : addr); | |
2391 | ||
aa3378df | 2392 | /* |
48e671d5 | 2393 | * getaddrinfo returns a loopback address if the hostname is |
2394 | * set to NULL and hints.ai_flags is not AI_PASSIVE | |
aa3378df | 2395 | */ |
48e671d5 | 2396 | memset(&hints, 0, sizeof(hints)); |
2397 | hints.ai_family = IPv4or6; | |
3867aa0a | 2398 | hints.ai_flags = wildcard ? AI_PASSIVE : 0; |
48e671d5 | 2399 | hints.ai_socktype = SOCK_STREAM; |
fa08c86b | 2400 | snprintf(strport, sizeof strport, "%d", listen_port); |
3867aa0a | 2401 | if ((r = getaddrinfo(addr, strport, &hints, &aitop)) != 0) { |
2402 | if (addr == NULL) { | |
2403 | /* This really shouldn't happen */ | |
2404 | packet_disconnect("getaddrinfo: fatal error: %s", | |
2405 | gai_strerror(r)); | |
2406 | } else { | |
38946c65 | 2407 | error("channel_setup_fwd_listener: " |
3867aa0a | 2408 | "getaddrinfo(%.64s): %s", addr, gai_strerror(r)); |
2409 | } | |
38946c65 | 2410 | return 0; |
3867aa0a | 2411 | } |
48e671d5 | 2412 | |
48e671d5 | 2413 | for (ai = aitop; ai; ai = ai->ai_next) { |
2414 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
2415 | continue; | |
2416 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), | |
2417 | strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { | |
5641aefa | 2418 | error("channel_setup_fwd_listener: getnameinfo failed"); |
48e671d5 | 2419 | continue; |
2420 | } | |
2421 | /* Create a port to listen for the host. */ | |
3e131a6d | 2422 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
48e671d5 | 2423 | if (sock < 0) { |
2424 | /* this is no error since kernel may not support ipv6 */ | |
2425 | verbose("socket: %.100s", strerror(errno)); | |
2426 | continue; | |
2427 | } | |
442aee3a | 2428 | |
2429 | channel_set_reuseaddr(sock); | |
facfd613 | 2430 | |
48e671d5 | 2431 | debug("Local forwarding listening on %s port %s.", ntop, strport); |
2432 | ||
2433 | /* Bind the socket to the address. */ | |
2434 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { | |
2435 | /* address can be in use ipv6 address is already bound */ | |
16218745 | 2436 | if (!ai->ai_next) |
2437 | error("bind: %.100s", strerror(errno)); | |
2438 | else | |
2439 | verbose("bind: %.100s", strerror(errno)); | |
2b87da3b | 2440 | |
48e671d5 | 2441 | close(sock); |
2442 | continue; | |
2443 | } | |
2444 | /* Start listening for connections on the socket. */ | |
fce39749 | 2445 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { |
48e671d5 | 2446 | error("listen: %.100s", strerror(errno)); |
2447 | close(sock); | |
2448 | continue; | |
2449 | } | |
2450 | /* Allocate a channel number for the socket. */ | |
8e7895b8 | 2451 | c = channel_new("port listener", type, sock, sock, -1, |
0b242b12 | 2452 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, |
0d942eff | 2453 | 0, "port listener", 1); |
719fc62f | 2454 | strlcpy(c->path, host, sizeof(c->path)); |
2455 | c->host_port = port_to_connect; | |
2456 | c->listening_port = listen_port; | |
48e671d5 | 2457 | success = 1; |
2458 | } | |
2459 | if (success == 0) | |
5641aefa | 2460 | error("channel_setup_fwd_listener: cannot listen to port: %d", |
02a024dd | 2461 | listen_port); |
48e671d5 | 2462 | freeaddrinfo(aitop); |
02a024dd | 2463 | return success; |
5260325f | 2464 | } |
8efc0c15 | 2465 | |
d740ec16 | 2466 | int |
2467 | channel_cancel_rport_listener(const char *host, u_short port) | |
2468 | { | |
9a995072 | 2469 | u_int i; |
2470 | int found = 0; | |
d740ec16 | 2471 | |
f8cc7664 | 2472 | for (i = 0; i < channels_alloc; i++) { |
d740ec16 | 2473 | Channel *c = channels[i]; |
2474 | ||
2475 | if (c != NULL && c->type == SSH_CHANNEL_RPORT_LISTENER && | |
2476 | strncmp(c->path, host, sizeof(c->path)) == 0 && | |
f2107e97 | 2477 | c->listening_port == port) { |
2912cbd6 | 2478 | debug2("%s: close channel %d", __func__, i); |
d740ec16 | 2479 | channel_free(c); |
2480 | found = 1; | |
2481 | } | |
2482 | } | |
2483 | ||
2484 | return (found); | |
2485 | } | |
2486 | ||
5641aefa | 2487 | /* protocol local port fwd, used by ssh (and sshd in v1) */ |
2488 | int | |
3867aa0a | 2489 | channel_setup_local_fwd_listener(const char *listen_host, u_short listen_port, |
5641aefa | 2490 | const char *host_to_connect, u_short port_to_connect, int gateway_ports) |
2491 | { | |
2492 | return channel_setup_fwd_listener(SSH_CHANNEL_PORT_LISTENER, | |
3867aa0a | 2493 | listen_host, listen_port, host_to_connect, port_to_connect, |
2494 | gateway_ports); | |
5641aefa | 2495 | } |
2496 | ||
2497 | /* protocol v2 remote port fwd, used by sshd */ | |
2498 | int | |
2499 | channel_setup_remote_fwd_listener(const char *listen_address, | |
2500 | u_short listen_port, int gateway_ports) | |
2501 | { | |
2502 | return channel_setup_fwd_listener(SSH_CHANNEL_RPORT_LISTENER, | |
2503 | listen_address, listen_port, NULL, 0, gateway_ports); | |
2504 | } | |
2505 | ||
aa3378df | 2506 | /* |
2507 | * Initiate forwarding of connections to port "port" on remote host through | |
2508 | * the secure channel to host:port from local side. | |
2509 | */ | |
8efc0c15 | 2510 | |
42ea6f5e | 2511 | int |
3867aa0a | 2512 | channel_request_remote_forwarding(const char *listen_host, u_short listen_port, |
fa08c86b | 2513 | const char *host_to_connect, u_short port_to_connect) |
8efc0c15 | 2514 | { |
54a5250f | 2515 | int type, success = 0; |
fa08c86b | 2516 | |
5260325f | 2517 | /* Record locally that connection to this host/port is permitted. */ |
2518 | if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
2519 | fatal("channel_request_remote_forwarding: too many forwards"); | |
2520 | ||
5260325f | 2521 | /* Send the forward request to the remote side. */ |
7e7327a1 | 2522 | if (compat20) { |
3867aa0a | 2523 | const char *address_to_bind; |
2524 | if (listen_host == NULL) | |
2525 | address_to_bind = "localhost"; | |
2526 | else if (*listen_host == '\0' || strcmp(listen_host, "*") == 0) | |
2527 | address_to_bind = ""; | |
2528 | else | |
2529 | address_to_bind = listen_host; | |
2530 | ||
7e7327a1 | 2531 | packet_start(SSH2_MSG_GLOBAL_REQUEST); |
2532 | packet_put_cstring("tcpip-forward"); | |
e0ae8728 | 2533 | packet_put_char(1); /* boolean: want reply */ |
7e7327a1 | 2534 | packet_put_cstring(address_to_bind); |
2535 | packet_put_int(listen_port); | |
fa08c86b | 2536 | packet_send(); |
2537 | packet_write_wait(); | |
2538 | /* Assume that server accepts the request */ | |
2539 | success = 1; | |
7e7327a1 | 2540 | } else { |
2541 | packet_start(SSH_CMSG_PORT_FORWARD_REQUEST); | |
7e7327a1 | 2542 | packet_put_int(listen_port); |
d6f24e45 | 2543 | packet_put_cstring(host_to_connect); |
2544 | packet_put_int(port_to_connect); | |
7e7327a1 | 2545 | packet_send(); |
2546 | packet_write_wait(); | |
fa08c86b | 2547 | |
2548 | /* Wait for response from the remote side. */ | |
54a5250f | 2549 | type = packet_read(); |
fa08c86b | 2550 | switch (type) { |
2551 | case SSH_SMSG_SUCCESS: | |
2552 | success = 1; | |
2553 | break; | |
2554 | case SSH_SMSG_FAILURE: | |
fa08c86b | 2555 | break; |
2556 | default: | |
2557 | /* Unknown packet */ | |
2558 | packet_disconnect("Protocol error for port forward request:" | |
2559 | "received packet type %d.", type); | |
2560 | } | |
2561 | } | |
2562 | if (success) { | |
2563 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host_to_connect); | |
2564 | permitted_opens[num_permitted_opens].port_to_connect = port_to_connect; | |
2565 | permitted_opens[num_permitted_opens].listen_port = listen_port; | |
2566 | num_permitted_opens++; | |
7e7327a1 | 2567 | } |
42ea6f5e | 2568 | return (success ? 0 : -1); |
8efc0c15 | 2569 | } |
2570 | ||
d740ec16 | 2571 | /* |
f2107e97 | 2572 | * Request cancellation of remote forwarding of connection host:port from |
d740ec16 | 2573 | * local side. |
2574 | */ | |
d740ec16 | 2575 | void |
3867aa0a | 2576 | channel_request_rforward_cancel(const char *host, u_short port) |
d740ec16 | 2577 | { |
2578 | int i; | |
d740ec16 | 2579 | |
2580 | if (!compat20) | |
2581 | return; | |
2582 | ||
2583 | for (i = 0; i < num_permitted_opens; i++) { | |
f2107e97 | 2584 | if (permitted_opens[i].host_to_connect != NULL && |
d740ec16 | 2585 | permitted_opens[i].listen_port == port) |
2586 | break; | |
2587 | } | |
2588 | if (i >= num_permitted_opens) { | |
2589 | debug("%s: requested forward not found", __func__); | |
2590 | return; | |
2591 | } | |
2592 | packet_start(SSH2_MSG_GLOBAL_REQUEST); | |
2593 | packet_put_cstring("cancel-tcpip-forward"); | |
2594 | packet_put_char(0); | |
3867aa0a | 2595 | packet_put_cstring(host == NULL ? "" : host); |
d740ec16 | 2596 | packet_put_int(port); |
2597 | packet_send(); | |
2598 | ||
2599 | permitted_opens[i].listen_port = 0; | |
2600 | permitted_opens[i].port_to_connect = 0; | |
8c4bd764 | 2601 | xfree(permitted_opens[i].host_to_connect); |
d740ec16 | 2602 | permitted_opens[i].host_to_connect = NULL; |
2603 | } | |
2604 | ||
aa3378df | 2605 | /* |
2606 | * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates | |
2607 | * listening for the port, and sends back a success reply (or disconnect | |
42ea6f5e | 2608 | * message if there was an error). |
aa3378df | 2609 | */ |
42ea6f5e | 2610 | int |
1d1ffb87 | 2611 | channel_input_port_forward_request(int is_root, int gateway_ports) |
8efc0c15 | 2612 | { |
57112b5a | 2613 | u_short port, host_port; |
42ea6f5e | 2614 | int success = 0; |
5260325f | 2615 | char *hostname; |
2616 | ||
2617 | /* Get arguments from the packet. */ | |
2618 | port = packet_get_int(); | |
2619 | hostname = packet_get_string(NULL); | |
2620 | host_port = packet_get_int(); | |
2621 | ||
3c62e7eb | 2622 | #ifndef HAVE_CYGWIN |
aa3378df | 2623 | /* |
2624 | * Check that an unprivileged user is not trying to forward a | |
2625 | * privileged port. | |
2626 | */ | |
5260325f | 2627 | if (port < IPPORT_RESERVED && !is_root) |
8e7c9afc | 2628 | packet_disconnect( |
2629 | "Requested forwarding of port %d but user is not root.", | |
2630 | port); | |
2631 | if (host_port == 0) | |
2632 | packet_disconnect("Dynamic forwarding denied."); | |
3c62e7eb | 2633 | #endif |
8e7c9afc | 2634 | |
fa08c86b | 2635 | /* Initiate forwarding */ |
42ea6f5e | 2636 | success = channel_setup_local_fwd_listener(NULL, port, hostname, |
3867aa0a | 2637 | host_port, gateway_ports); |
5260325f | 2638 | |
2639 | /* Free the argument string. */ | |
2640 | xfree(hostname); | |
42ea6f5e | 2641 | |
2642 | return (success ? 0 : -1); | |
8efc0c15 | 2643 | } |
2644 | ||
01794848 | 2645 | /* |
2646 | * Permits opening to any host/port if permitted_opens[] is empty. This is | |
2647 | * usually called by the server, because the user could connect to any port | |
2648 | * anyway, and the server has no way to know but to trust the client anyway. | |
2649 | */ | |
2650 | void | |
d5bb9418 | 2651 | channel_permit_all_opens(void) |
01794848 | 2652 | { |
2653 | if (num_permitted_opens == 0) | |
2654 | all_opens_permitted = 1; | |
2655 | } | |
2656 | ||
cd332296 | 2657 | void |
01794848 | 2658 | channel_add_permitted_opens(char *host, int port) |
2659 | { | |
2660 | if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
42ea6f5e | 2661 | fatal("channel_add_permitted_opens: too many forwards"); |
01794848 | 2662 | debug("allow port forwarding to host %s port %d", host, port); |
2663 | ||
2664 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host); | |
2665 | permitted_opens[num_permitted_opens].port_to_connect = port; | |
2666 | num_permitted_opens++; | |
2667 | ||
2668 | all_opens_permitted = 0; | |
2669 | } | |
2670 | ||
ea46e550 | 2671 | int |
2fefbadf | 2672 | channel_add_adm_permitted_opens(char *host, int port) |
2673 | { | |
2674 | if (num_adm_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
2675 | fatal("channel_add_adm_permitted_opens: too many forwards"); | |
ea46e550 | 2676 | debug("config allows port forwarding to host %s port %d", host, port); |
2fefbadf | 2677 | |
2678 | permitted_adm_opens[num_adm_permitted_opens].host_to_connect | |
2679 | = xstrdup(host); | |
2680 | permitted_adm_opens[num_adm_permitted_opens].port_to_connect = port; | |
ea46e550 | 2681 | return ++num_adm_permitted_opens; |
2fefbadf | 2682 | } |
2683 | ||
cd332296 | 2684 | void |
01794848 | 2685 | channel_clear_permitted_opens(void) |
2686 | { | |
2687 | int i; | |
2688 | ||
2689 | for (i = 0; i < num_permitted_opens; i++) | |
d740ec16 | 2690 | if (permitted_opens[i].host_to_connect != NULL) |
2691 | xfree(permitted_opens[i].host_to_connect); | |
01794848 | 2692 | num_permitted_opens = 0; |
2fefbadf | 2693 | } |
2694 | ||
2695 | void | |
2696 | channel_clear_adm_permitted_opens(void) | |
2697 | { | |
2698 | int i; | |
01794848 | 2699 | |
2fefbadf | 2700 | for (i = 0; i < num_adm_permitted_opens; i++) |
2701 | if (permitted_adm_opens[i].host_to_connect != NULL) | |
2702 | xfree(permitted_adm_opens[i].host_to_connect); | |
2703 | num_adm_permitted_opens = 0; | |
01794848 | 2704 | } |
2705 | ||
01794848 | 2706 | /* return socket to remote host, port */ |
396c147e | 2707 | static int |
01794848 | 2708 | connect_to(const char *host, u_short port) |
8efc0c15 | 2709 | { |
48e671d5 | 2710 | struct addrinfo hints, *ai, *aitop; |
2711 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; | |
2712 | int gaierr; | |
7368a6c8 | 2713 | int sock = -1; |
48e671d5 | 2714 | |
2715 | memset(&hints, 0, sizeof(hints)); | |
2716 | hints.ai_family = IPv4or6; | |
2717 | hints.ai_socktype = SOCK_STREAM; | |
01794848 | 2718 | snprintf(strport, sizeof strport, "%d", port); |
48e671d5 | 2719 | if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) { |
01794848 | 2720 | error("connect_to %.100s: unknown host (%s)", host, |
2721 | gai_strerror(gaierr)); | |
7368a6c8 | 2722 | return -1; |
48e671d5 | 2723 | } |
48e671d5 | 2724 | for (ai = aitop; ai; ai = ai->ai_next) { |
2725 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
2726 | continue; | |
2727 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), | |
2728 | strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { | |
01794848 | 2729 | error("connect_to: getnameinfo failed"); |
48e671d5 | 2730 | continue; |
5260325f | 2731 | } |
3e131a6d | 2732 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
48e671d5 | 2733 | if (sock < 0) { |
4940c411 | 2734 | if (ai->ai_next == NULL) |
2735 | error("socket: %.100s", strerror(errno)); | |
2736 | else | |
2737 | verbose("socket: %.100s", strerror(errno)); | |
48e671d5 | 2738 | continue; |
5260325f | 2739 | } |
170694d7 | 2740 | if (set_nonblock(sock) == -1) |
2741 | fatal("%s: set_nonblock(%d)", __func__, sock); | |
97fb6912 | 2742 | if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0 && |
2743 | errno != EINPROGRESS) { | |
01794848 | 2744 | error("connect_to %.100s port %s: %.100s", ntop, strport, |
48e671d5 | 2745 | strerror(errno)); |
2746 | close(sock); | |
2b87da3b | 2747 | continue; /* fail -- try next */ |
48e671d5 | 2748 | } |
2749 | break; /* success */ | |
5260325f | 2750 | |
5260325f | 2751 | } |
48e671d5 | 2752 | freeaddrinfo(aitop); |
48e671d5 | 2753 | if (!ai) { |
01794848 | 2754 | error("connect_to %.100s port %d: failed.", host, port); |
7368a6c8 | 2755 | return -1; |
8efc0c15 | 2756 | } |
7368a6c8 | 2757 | /* success */ |
811a6342 | 2758 | set_nodelay(sock); |
7368a6c8 | 2759 | return sock; |
2760 | } | |
01794848 | 2761 | |
fa08c86b | 2762 | int |
b3f8a79c | 2763 | channel_connect_by_listen_address(u_short listen_port) |
fa08c86b | 2764 | { |
2765 | int i; | |
01794848 | 2766 | |
fa08c86b | 2767 | for (i = 0; i < num_permitted_opens; i++) |
d740ec16 | 2768 | if (permitted_opens[i].host_to_connect != NULL && |
2769 | permitted_opens[i].listen_port == listen_port) | |
01794848 | 2770 | return connect_to( |
fa08c86b | 2771 | permitted_opens[i].host_to_connect, |
2772 | permitted_opens[i].port_to_connect); | |
0b6fbf03 | 2773 | error("WARNING: Server requests forwarding for unknown listen_port %d", |
2774 | listen_port); | |
fa08c86b | 2775 | return -1; |
2776 | } | |
48e671d5 | 2777 | |
01794848 | 2778 | /* Check if connecting to that port is permitted and connect. */ |
2779 | int | |
2780 | channel_connect_to(const char *host, u_short port) | |
2781 | { | |
2fefbadf | 2782 | int i, permit, permit_adm = 1; |
01794848 | 2783 | |
2784 | permit = all_opens_permitted; | |
2785 | if (!permit) { | |
2786 | for (i = 0; i < num_permitted_opens; i++) | |
d740ec16 | 2787 | if (permitted_opens[i].host_to_connect != NULL && |
2788 | permitted_opens[i].port_to_connect == port && | |
01794848 | 2789 | strcmp(permitted_opens[i].host_to_connect, host) == 0) |
2790 | permit = 1; | |
2fefbadf | 2791 | } |
01794848 | 2792 | |
2fefbadf | 2793 | if (num_adm_permitted_opens > 0) { |
2794 | permit_adm = 0; | |
2795 | for (i = 0; i < num_adm_permitted_opens; i++) | |
2796 | if (permitted_adm_opens[i].host_to_connect != NULL && | |
2797 | permitted_adm_opens[i].port_to_connect == port && | |
2798 | strcmp(permitted_adm_opens[i].host_to_connect, host) | |
2799 | == 0) | |
2800 | permit_adm = 1; | |
01794848 | 2801 | } |
2fefbadf | 2802 | |
2803 | if (!permit || !permit_adm) { | |
bbe88b6d | 2804 | logit("Received request to connect to host %.100s port %d, " |
01794848 | 2805 | "but the request was denied.", host, port); |
2806 | return -1; | |
2807 | } | |
2808 | return connect_to(host, port); | |
2809 | } | |
2810 | ||
5e96b616 | 2811 | void |
2812 | channel_send_window_changes(void) | |
2813 | { | |
9a995072 | 2814 | u_int i; |
5e96b616 | 2815 | struct winsize ws; |
2816 | ||
2817 | for (i = 0; i < channels_alloc; i++) { | |
f8cc7664 | 2818 | if (channels[i] == NULL || !channels[i]->client_tty || |
5e96b616 | 2819 | channels[i]->type != SSH_CHANNEL_OPEN) |
2820 | continue; | |
2821 | if (ioctl(channels[i]->rfd, TIOCGWINSZ, &ws) < 0) | |
2822 | continue; | |
2823 | channel_request_start(i, "window-change", 0); | |
148de80c | 2824 | packet_put_int((u_int)ws.ws_col); |
2825 | packet_put_int((u_int)ws.ws_row); | |
2826 | packet_put_int((u_int)ws.ws_xpixel); | |
2827 | packet_put_int((u_int)ws.ws_ypixel); | |
5e96b616 | 2828 | packet_send(); |
2829 | } | |
2830 | } | |
2831 | ||
8e7895b8 | 2832 | /* -- X11 forwarding */ |
8efc0c15 | 2833 | |
aa3378df | 2834 | /* |
2835 | * Creates an internet domain socket for listening for X11 connections. | |
57f228e8 | 2836 | * Returns 0 and a suitable display number for the DISPLAY variable |
2837 | * stored in display_numberp , or -1 if an error occurs. | |
aa3378df | 2838 | */ |
c9d0ad9b | 2839 | int |
e6e573bd | 2840 | x11_create_display_inet(int x11_display_offset, int x11_use_localhost, |
d08341e6 | 2841 | int single_connection, u_int *display_numberp, int **chanids) |
8efc0c15 | 2842 | { |
ac151b18 | 2843 | Channel *nc = NULL; |
57112b5a | 2844 | int display_number, sock; |
2845 | u_short port; | |
48e671d5 | 2846 | struct addrinfo hints, *ai, *aitop; |
2847 | char strport[NI_MAXSERV]; | |
2848 | int gaierr, n, num_socks = 0, socks[NUM_SOCKS]; | |
5260325f | 2849 | |
59e5aff5 | 2850 | if (chanids == NULL) |
2851 | return -1; | |
2852 | ||
95f1eccc | 2853 | for (display_number = x11_display_offset; |
184eed6a | 2854 | display_number < MAX_DISPLAYS; |
2855 | display_number++) { | |
5260325f | 2856 | port = 6000 + display_number; |
48e671d5 | 2857 | memset(&hints, 0, sizeof(hints)); |
2858 | hints.ai_family = IPv4or6; | |
e6e573bd | 2859 | hints.ai_flags = x11_use_localhost ? 0: AI_PASSIVE; |
48e671d5 | 2860 | hints.ai_socktype = SOCK_STREAM; |
2861 | snprintf(strport, sizeof strport, "%d", port); | |
2862 | if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) { | |
2863 | error("getaddrinfo: %.100s", gai_strerror(gaierr)); | |
c9d0ad9b | 2864 | return -1; |
5260325f | 2865 | } |
48e671d5 | 2866 | for (ai = aitop; ai; ai = ai->ai_next) { |
2867 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
2868 | continue; | |
3e131a6d | 2869 | sock = socket(ai->ai_family, ai->ai_socktype, |
2870 | ai->ai_protocol); | |
48e671d5 | 2871 | if (sock < 0) { |
4ee81249 | 2872 | if ((errno != EINVAL) && (errno != EAFNOSUPPORT)) { |
80a44451 | 2873 | error("socket: %.100s", strerror(errno)); |
0ea89f7e | 2874 | freeaddrinfo(aitop); |
c9d0ad9b | 2875 | return -1; |
80a44451 | 2876 | } else { |
22d89d24 | 2877 | debug("x11_create_display_inet: Socket family %d not supported", |
2878 | ai->ai_family); | |
80a44451 | 2879 | continue; |
2880 | } | |
48e671d5 | 2881 | } |
688aaeda | 2882 | #ifdef IPV6_V6ONLY |
2883 | if (ai->ai_family == AF_INET6) { | |
2884 | int on = 1; | |
2885 | if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) < 0) | |
2886 | error("setsockopt IPV6_V6ONLY: %.100s", strerror(errno)); | |
2887 | } | |
2888 | #endif | |
442aee3a | 2889 | channel_set_reuseaddr(sock); |
48e671d5 | 2890 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { |
d7ac5f18 | 2891 | debug2("bind port %d: %.100s", port, strerror(errno)); |
48e671d5 | 2892 | close(sock); |
16218745 | 2893 | |
2894 | if (ai->ai_next) | |
2895 | continue; | |
2896 | ||
48e671d5 | 2897 | for (n = 0; n < num_socks; n++) { |
48e671d5 | 2898 | close(socks[n]); |
2899 | } | |
2900 | num_socks = 0; | |
2901 | break; | |
2902 | } | |
2903 | socks[num_socks++] = sock; | |
80faa19f | 2904 | #ifndef DONT_TRY_OTHER_AF |
48e671d5 | 2905 | if (num_socks == NUM_SOCKS) |
2906 | break; | |
80faa19f | 2907 | #else |
688aaeda | 2908 | if (x11_use_localhost) { |
2909 | if (num_socks == NUM_SOCKS) | |
2910 | break; | |
2911 | } else { | |
2912 | break; | |
2913 | } | |
80faa19f | 2914 | #endif |
5260325f | 2915 | } |
4ccb01d6 | 2916 | freeaddrinfo(aitop); |
48e671d5 | 2917 | if (num_socks > 0) |
2918 | break; | |
5260325f | 2919 | } |
2920 | if (display_number >= MAX_DISPLAYS) { | |
2921 | error("Failed to allocate internet-domain X11 display socket."); | |
c9d0ad9b | 2922 | return -1; |
8efc0c15 | 2923 | } |
5260325f | 2924 | /* Start listening for connections on the socket. */ |
48e671d5 | 2925 | for (n = 0; n < num_socks; n++) { |
2926 | sock = socks[n]; | |
fce39749 | 2927 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { |
48e671d5 | 2928 | error("listen: %.100s", strerror(errno)); |
48e671d5 | 2929 | close(sock); |
c9d0ad9b | 2930 | return -1; |
a7effaac | 2931 | } |
a7effaac | 2932 | } |
5260325f | 2933 | |
48e671d5 | 2934 | /* Allocate a channel for each socket. */ |
52e3daed | 2935 | *chanids = xcalloc(num_socks + 1, sizeof(**chanids)); |
48e671d5 | 2936 | for (n = 0; n < num_socks; n++) { |
2937 | sock = socks[n]; | |
ac151b18 | 2938 | nc = channel_new("x11 listener", |
0b242b12 | 2939 | SSH_CHANNEL_X11_LISTENER, sock, sock, -1, |
2940 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, | |
0d942eff | 2941 | 0, "X11 inet listener", 1); |
3a0d3d54 | 2942 | nc->single_connection = single_connection; |
59e5aff5 | 2943 | (*chanids)[n] = nc->self; |
48e671d5 | 2944 | } |
59e5aff5 | 2945 | (*chanids)[n] = -1; |
5260325f | 2946 | |
c9d0ad9b | 2947 | /* Return the display number for the DISPLAY environment variable. */ |
57f228e8 | 2948 | *display_numberp = display_number; |
2949 | return (0); | |
8efc0c15 | 2950 | } |
2951 | ||
396c147e | 2952 | static int |
1e3b8b07 | 2953 | connect_local_xsocket(u_int dnr) |
8efc0c15 | 2954 | { |
5260325f | 2955 | int sock; |
2956 | struct sockaddr_un addr; | |
5260325f | 2957 | |
805e659f | 2958 | sock = socket(AF_UNIX, SOCK_STREAM, 0); |
2959 | if (sock < 0) | |
2960 | error("socket: %.100s", strerror(errno)); | |
2961 | memset(&addr, 0, sizeof(addr)); | |
2962 | addr.sun_family = AF_UNIX; | |
2963 | snprintf(addr.sun_path, sizeof addr.sun_path, _PATH_UNIX_X, dnr); | |
32596c7b | 2964 | if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) == 0) |
805e659f | 2965 | return sock; |
2966 | close(sock); | |
5260325f | 2967 | error("connect %.100s: %.100s", addr.sun_path, strerror(errno)); |
2968 | return -1; | |
8efc0c15 | 2969 | } |
2970 | ||
0b242b12 | 2971 | int |
2972 | x11_connect_display(void) | |
8efc0c15 | 2973 | { |
4f16046f | 2974 | u_int display_number; |
5260325f | 2975 | const char *display; |
0b242b12 | 2976 | char buf[1024], *cp; |
48e671d5 | 2977 | struct addrinfo hints, *ai, *aitop; |
2978 | char strport[NI_MAXSERV]; | |
4f16046f | 2979 | int gaierr, sock = 0; |
5260325f | 2980 | |
5260325f | 2981 | /* Try to open a socket for the local X server. */ |
2982 | display = getenv("DISPLAY"); | |
2983 | if (!display) { | |
2984 | error("DISPLAY not set."); | |
0b242b12 | 2985 | return -1; |
5260325f | 2986 | } |
aa3378df | 2987 | /* |
2988 | * Now we decode the value of the DISPLAY variable and make a | |
2989 | * connection to the real X server. | |
2990 | */ | |
2991 | ||
2992 | /* | |
2993 | * Check if it is a unix domain socket. Unix domain displays are in | |
2994 | * one of the following formats: unix:d[.s], :d[.s], ::d[.s] | |
2995 | */ | |
5260325f | 2996 | if (strncmp(display, "unix:", 5) == 0 || |
2997 | display[0] == ':') { | |
2998 | /* Connect to the unix domain socket. */ | |
4f16046f | 2999 | if (sscanf(strrchr(display, ':') + 1, "%u", &display_number) != 1) { |
5260325f | 3000 | error("Could not parse display number from DISPLAY: %.100s", |
184eed6a | 3001 | display); |
0b242b12 | 3002 | return -1; |
5260325f | 3003 | } |
3004 | /* Create a socket. */ | |
3005 | sock = connect_local_xsocket(display_number); | |
3006 | if (sock < 0) | |
0b242b12 | 3007 | return -1; |
5260325f | 3008 | |
3009 | /* OK, we now have a connection to the display. */ | |
0b242b12 | 3010 | return sock; |
5260325f | 3011 | } |
aa3378df | 3012 | /* |
3013 | * Connect to an inet socket. The DISPLAY value is supposedly | |
3014 | * hostname:d[.s], where hostname may also be numeric IP address. | |
3015 | */ | |
74860245 | 3016 | strlcpy(buf, display, sizeof(buf)); |
5260325f | 3017 | cp = strchr(buf, ':'); |
3018 | if (!cp) { | |
3019 | error("Could not find ':' in DISPLAY: %.100s", display); | |
0b242b12 | 3020 | return -1; |
5260325f | 3021 | } |
3022 | *cp = 0; | |
aa3378df | 3023 | /* buf now contains the host name. But first we parse the display number. */ |
4f16046f | 3024 | if (sscanf(cp + 1, "%u", &display_number) != 1) { |
5260325f | 3025 | error("Could not parse display number from DISPLAY: %.100s", |
184eed6a | 3026 | display); |
0b242b12 | 3027 | return -1; |
5260325f | 3028 | } |
5260325f | 3029 | |
48e671d5 | 3030 | /* Look up the host address */ |
3031 | memset(&hints, 0, sizeof(hints)); | |
3032 | hints.ai_family = IPv4or6; | |
3033 | hints.ai_socktype = SOCK_STREAM; | |
4f16046f | 3034 | snprintf(strport, sizeof strport, "%u", 6000 + display_number); |
48e671d5 | 3035 | if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) { |
3036 | error("%.100s: unknown host. (%s)", buf, gai_strerror(gaierr)); | |
0b242b12 | 3037 | return -1; |
8efc0c15 | 3038 | } |
48e671d5 | 3039 | for (ai = aitop; ai; ai = ai->ai_next) { |
3040 | /* Create a socket. */ | |
3e131a6d | 3041 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
48e671d5 | 3042 | if (sock < 0) { |
d7ac5f18 | 3043 | debug2("socket: %.100s", strerror(errno)); |
7368a6c8 | 3044 | continue; |
3045 | } | |
3046 | /* Connect it to the display. */ | |
3047 | if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) { | |
4f16046f | 3048 | debug2("connect %.100s port %u: %.100s", buf, |
7368a6c8 | 3049 | 6000 + display_number, strerror(errno)); |
3050 | close(sock); | |
3051 | continue; | |
3052 | } | |
3053 | /* Success */ | |
3054 | break; | |
48e671d5 | 3055 | } |
48e671d5 | 3056 | freeaddrinfo(aitop); |
3057 | if (!ai) { | |
4f16046f | 3058 | error("connect %.100s port %u: %.100s", buf, 6000 + display_number, |
48e671d5 | 3059 | strerror(errno)); |
0b242b12 | 3060 | return -1; |
8efc0c15 | 3061 | } |
bcc0381e | 3062 | set_nodelay(sock); |
0b242b12 | 3063 | return sock; |
3064 | } | |
5260325f | 3065 | |
0b242b12 | 3066 | /* |
3067 | * This is called when SSH_SMSG_X11_OPEN is received. The packet contains | |
3068 | * the remote channel number. We should do whatever we want, and respond | |
3069 | * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE. | |
3070 | */ | |
5260325f | 3071 | |
ebb90778 | 3072 | /* ARGSUSED */ |
0b242b12 | 3073 | void |
7819b5c3 | 3074 | x11_input_open(int type, u_int32_t seq, void *ctxt) |
0b242b12 | 3075 | { |
719fc62f | 3076 | Channel *c = NULL; |
3077 | int remote_id, sock = 0; | |
0b242b12 | 3078 | char *remote_host; |
5260325f | 3079 | |
719fc62f | 3080 | debug("Received X11 open request."); |
5260325f | 3081 | |
719fc62f | 3082 | remote_id = packet_get_int(); |
8e7895b8 | 3083 | |
3084 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) { | |
719fc62f | 3085 | remote_host = packet_get_string(NULL); |
0b242b12 | 3086 | } else { |
3087 | remote_host = xstrdup("unknown (remote did not supply name)"); | |
0b242b12 | 3088 | } |
95500969 | 3089 | packet_check_eom(); |
0b242b12 | 3090 | |
3091 | /* Obtain a connection to the real X display. */ | |
3092 | sock = x11_connect_display(); | |
719fc62f | 3093 | if (sock != -1) { |
3094 | /* Allocate a channel for this connection. */ | |
3095 | c = channel_new("connected x11 socket", | |
3096 | SSH_CHANNEL_X11_OPEN, sock, sock, -1, 0, 0, 0, | |
3097 | remote_host, 1); | |
3a0d3d54 | 3098 | c->remote_id = remote_id; |
3099 | c->force_drain = 1; | |
719fc62f | 3100 | } |
0d942eff | 3101 | xfree(remote_host); |
719fc62f | 3102 | if (c == NULL) { |
0b242b12 | 3103 | /* Send refusal to the remote host. */ |
3104 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
719fc62f | 3105 | packet_put_int(remote_id); |
0b242b12 | 3106 | } else { |
0b242b12 | 3107 | /* Send a confirmation to the remote host. */ |
3108 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
719fc62f | 3109 | packet_put_int(remote_id); |
3110 | packet_put_int(c->self); | |
0b242b12 | 3111 | } |
719fc62f | 3112 | packet_send(); |
8efc0c15 | 3113 | } |
3114 | ||
a22aff1f | 3115 | /* dummy protocol handler that denies SSH-1 requests (agent/x11) */ |
ebb90778 | 3116 | /* ARGSUSED */ |
a22aff1f | 3117 | void |
7819b5c3 | 3118 | deny_input_open(int type, u_int32_t seq, void *ctxt) |
a22aff1f | 3119 | { |
3120 | int rchan = packet_get_int(); | |
e1feb9bf | 3121 | |
6aacefa7 | 3122 | switch (type) { |
a22aff1f | 3123 | case SSH_SMSG_AGENT_OPEN: |
3124 | error("Warning: ssh server tried agent forwarding."); | |
3125 | break; | |
3126 | case SSH_SMSG_X11_OPEN: | |
3127 | error("Warning: ssh server tried X11 forwarding."); | |
3128 | break; | |
3129 | default: | |
7819b5c3 | 3130 | error("deny_input_open: type %d", type); |
a22aff1f | 3131 | break; |
3132 | } | |
1908529f | 3133 | error("Warning: this is probably a break-in attempt by a malicious server."); |
a22aff1f | 3134 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
3135 | packet_put_int(rchan); | |
3136 | packet_send(); | |
3137 | } | |
3138 | ||
aa3378df | 3139 | /* |
3140 | * Requests forwarding of X11 connections, generates fake authentication | |
3141 | * data, and enables authentication spoofing. | |
8e7895b8 | 3142 | * This should be called in the client only. |
aa3378df | 3143 | */ |
6ae2364d | 3144 | void |
9bf083eb | 3145 | x11_request_forwarding_with_spoofing(int client_session_id, const char *disp, |
0b242b12 | 3146 | const char *proto, const char *data) |
8efc0c15 | 3147 | { |
1e3b8b07 | 3148 | u_int data_len = (u_int) strlen(data) / 2; |
ef07103c | 3149 | u_int i, value; |
5260325f | 3150 | char *new_data; |
3151 | int screen_number; | |
3152 | const char *cp; | |
ca75d7de | 3153 | u_int32_t rnd = 0; |
5260325f | 3154 | |
4297b666 | 3155 | if (x11_saved_display == NULL) |
3156 | x11_saved_display = xstrdup(disp); | |
3157 | else if (strcmp(disp, x11_saved_display) != 0) { | |
ef07103c | 3158 | error("x11_request_forwarding_with_spoofing: different " |
3159 | "$DISPLAY already forwarded"); | |
3160 | return; | |
3161 | } | |
3162 | ||
9bf083eb | 3163 | cp = disp; |
3164 | if (disp) | |
3165 | cp = strchr(disp, ':'); | |
5260325f | 3166 | if (cp) |
3167 | cp = strchr(cp, '.'); | |
3168 | if (cp) | |
d6d4897e | 3169 | screen_number = (u_int)strtonum(cp + 1, 0, 400, NULL); |
5260325f | 3170 | else |
3171 | screen_number = 0; | |
3172 | ||
ef07103c | 3173 | if (x11_saved_proto == NULL) { |
3174 | /* Save protocol name. */ | |
3175 | x11_saved_proto = xstrdup(proto); | |
3176 | /* | |
56964485 | 3177 | * Extract real authentication data and generate fake data |
ef07103c | 3178 | * of the same length. |
3179 | */ | |
3180 | x11_saved_data = xmalloc(data_len); | |
3181 | x11_fake_data = xmalloc(data_len); | |
3182 | for (i = 0; i < data_len; i++) { | |
3183 | if (sscanf(data + 2 * i, "%2x", &value) != 1) | |
3184 | fatal("x11_request_forwarding: bad " | |
3185 | "authentication data: %.100s", data); | |
3186 | if (i % 4 == 0) | |
3187 | rnd = arc4random(); | |
3188 | x11_saved_data[i] = value; | |
3189 | x11_fake_data[i] = rnd & 0xff; | |
3190 | rnd >>= 8; | |
3191 | } | |
3192 | x11_saved_data_len = data_len; | |
3193 | x11_fake_data_len = data_len; | |
3194 | } | |
5260325f | 3195 | |
3196 | /* Convert the fake data into hex. */ | |
ef07103c | 3197 | new_data = tohex(x11_fake_data, data_len); |
5260325f | 3198 | |
3199 | /* Send the request packet. */ | |
0b242b12 | 3200 | if (compat20) { |
3201 | channel_request_start(client_session_id, "x11-req", 0); | |
3202 | packet_put_char(0); /* XXX bool single connection */ | |
3203 | } else { | |
3204 | packet_start(SSH_CMSG_X11_REQUEST_FORWARDING); | |
3205 | } | |
3206 | packet_put_cstring(proto); | |
3207 | packet_put_cstring(new_data); | |
5260325f | 3208 | packet_put_int(screen_number); |
3209 | packet_send(); | |
3210 | packet_write_wait(); | |
3211 | xfree(new_data); | |
8efc0c15 | 3212 | } |
3213 | ||
8e7895b8 | 3214 | |
3215 | /* -- agent forwarding */ | |
3216 | ||
8efc0c15 | 3217 | /* Sends a message to the server to request authentication fd forwarding. */ |
3218 | ||
6ae2364d | 3219 | void |
d5bb9418 | 3220 | auth_request_forwarding(void) |
8efc0c15 | 3221 | { |
5260325f | 3222 | packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING); |
3223 | packet_send(); | |
3224 | packet_write_wait(); | |
8efc0c15 | 3225 | } |