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ebb90778 | 1 | /* $OpenBSD: channels.c,v 1.259 2006/07/21 21:13:30 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 | |
1d3e026f | 56 | #include <termios.h> |
5188ba17 | 57 | #include <unistd.h> |
8efc0c15 | 58 | |
59 | #include "ssh.h" | |
42f11eb2 | 60 | #include "ssh1.h" |
61 | #include "ssh2.h" | |
8efc0c15 | 62 | #include "packet.h" |
63 | #include "xmalloc.h" | |
42f11eb2 | 64 | #include "log.h" |
65 | #include "misc.h" | |
8efc0c15 | 66 | #include "channels.h" |
8efc0c15 | 67 | #include "compat.h" |
42f11eb2 | 68 | #include "canohost.h" |
4c8722d9 | 69 | #include "key.h" |
70 | #include "authfd.h" | |
805e659f | 71 | #include "pathnames.h" |
f49658f5 | 72 | #include "bufaux.h" |
8efc0c15 | 73 | |
8e7895b8 | 74 | /* -- channel core */ |
8efc0c15 | 75 | |
aa3378df | 76 | /* |
77 | * Pointer to an array containing all allocated channels. The array is | |
78 | * dynamically extended as needed. | |
79 | */ | |
719fc62f | 80 | static Channel **channels = NULL; |
8efc0c15 | 81 | |
aa3378df | 82 | /* |
83 | * Size of the channel array. All slots of the array must always be | |
719fc62f | 84 | * initialized (at least the type field); unused slots set to NULL |
aa3378df | 85 | */ |
9a995072 | 86 | static u_int channels_alloc = 0; |
8efc0c15 | 87 | |
aa3378df | 88 | /* |
89 | * Maximum file descriptor value used in any of the channels. This is | |
719fc62f | 90 | * updated in channel_new. |
aa3378df | 91 | */ |
39929cdb | 92 | static int channel_max_fd = 0; |
8efc0c15 | 93 | |
8efc0c15 | 94 | |
8e7895b8 | 95 | /* -- tcp forwarding */ |
8efc0c15 | 96 | |
aa3378df | 97 | /* |
98 | * Data structure for storing which hosts are permitted for forward requests. | |
99 | * The local sides of any remote forwards are stored in this array to prevent | |
100 | * a corrupt remote server from accessing arbitrary TCP/IP ports on our local | |
101 | * network (which might be behind a firewall). | |
102 | */ | |
5260325f | 103 | typedef struct { |
7368a6c8 | 104 | char *host_to_connect; /* Connect to 'host'. */ |
105 | u_short port_to_connect; /* Connect to 'port'. */ | |
106 | u_short listen_port; /* Remote side should listen port number. */ | |
8efc0c15 | 107 | } ForwardPermission; |
108 | ||
2fefbadf | 109 | /* List of all permitted host/port pairs to connect by the user. */ |
8efc0c15 | 110 | static ForwardPermission permitted_opens[SSH_MAX_FORWARDS_PER_DIRECTION]; |
8e7895b8 | 111 | |
2fefbadf | 112 | /* List of all permitted host/port pairs to connect by the admin. */ |
113 | static ForwardPermission permitted_adm_opens[SSH_MAX_FORWARDS_PER_DIRECTION]; | |
114 | ||
115 | /* Number of permitted host/port pairs in the array permitted by the user. */ | |
8efc0c15 | 116 | static int num_permitted_opens = 0; |
2fefbadf | 117 | |
118 | /* Number of permitted host/port pair in the array permitted by the admin. */ | |
119 | static int num_adm_permitted_opens = 0; | |
120 | ||
aa3378df | 121 | /* |
122 | * If this is true, all opens are permitted. This is the case on the server | |
123 | * on which we have to trust the client anyway, and the user could do | |
124 | * anything after logging in anyway. | |
125 | */ | |
8efc0c15 | 126 | static int all_opens_permitted = 0; |
127 | ||
8efc0c15 | 128 | |
8e7895b8 | 129 | /* -- X11 forwarding */ |
42f11eb2 | 130 | |
8e7895b8 | 131 | /* Maximum number of fake X11 displays to try. */ |
132 | #define MAX_DISPLAYS 1000 | |
0490e609 | 133 | |
ef07103c | 134 | /* Saved X11 local (client) display. */ |
135 | static char *x11_saved_display = NULL; | |
136 | ||
8e7895b8 | 137 | /* Saved X11 authentication protocol name. */ |
138 | static char *x11_saved_proto = NULL; | |
8efc0c15 | 139 | |
8e7895b8 | 140 | /* Saved X11 authentication data. This is the real data. */ |
141 | static char *x11_saved_data = NULL; | |
142 | static u_int x11_saved_data_len = 0; | |
143 | ||
144 | /* | |
145 | * Fake X11 authentication data. This is what the server will be sending us; | |
146 | * we should replace any occurrences of this by the real data. | |
147 | */ | |
338eb2ab | 148 | static u_char *x11_fake_data = NULL; |
8e7895b8 | 149 | static u_int x11_fake_data_len; |
150 | ||
151 | ||
152 | /* -- agent forwarding */ | |
8efc0c15 | 153 | |
8e7895b8 | 154 | #define NUM_SOCKS 10 |
155 | ||
8e7895b8 | 156 | /* AF_UNSPEC or AF_INET or AF_INET6 */ |
5e4a7219 | 157 | static int IPv4or6 = AF_UNSPEC; |
8e7895b8 | 158 | |
159 | /* helper */ | |
396c147e | 160 | static void port_open_helper(Channel *c, char *rtype); |
8e7895b8 | 161 | |
162 | /* -- channel core */ | |
7368a6c8 | 163 | |
164 | Channel * | |
b872f7f0 | 165 | channel_by_id(int id) |
7368a6c8 | 166 | { |
167 | Channel *c; | |
719fc62f | 168 | |
9a995072 | 169 | if (id < 0 || (u_int)id >= channels_alloc) { |
b872f7f0 | 170 | logit("channel_by_id: %d: bad id", id); |
7368a6c8 | 171 | return NULL; |
172 | } | |
719fc62f | 173 | c = channels[id]; |
174 | if (c == NULL) { | |
b872f7f0 | 175 | logit("channel_by_id: %d: bad id: channel free", id); |
7368a6c8 | 176 | return NULL; |
177 | } | |
178 | return c; | |
179 | } | |
180 | ||
b872f7f0 | 181 | /* |
182 | * Returns the channel if it is allowed to receive protocol messages. | |
183 | * Private channels, like listening sockets, may not receive messages. | |
184 | */ | |
185 | Channel * | |
186 | channel_lookup(int id) | |
187 | { | |
188 | Channel *c; | |
189 | ||
190 | if ((c = channel_by_id(id)) == NULL) | |
191 | return (NULL); | |
192 | ||
c8e9c167 | 193 | switch (c->type) { |
b872f7f0 | 194 | case SSH_CHANNEL_X11_OPEN: |
195 | case SSH_CHANNEL_LARVAL: | |
196 | case SSH_CHANNEL_CONNECTING: | |
197 | case SSH_CHANNEL_DYNAMIC: | |
198 | case SSH_CHANNEL_OPENING: | |
199 | case SSH_CHANNEL_OPEN: | |
200 | case SSH_CHANNEL_INPUT_DRAINING: | |
201 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
202 | return (c); | |
b872f7f0 | 203 | } |
204 | logit("Non-public channel %d, type %d.", id, c->type); | |
205 | return (NULL); | |
206 | } | |
207 | ||
aa3378df | 208 | /* |
1d1ffb87 | 209 | * Register filedescriptors for a channel, used when allocating a channel or |
0fbe8c74 | 210 | * when the channel consumer/producer is ready, e.g. shell exec'd |
aa3378df | 211 | */ |
396c147e | 212 | static void |
a22aff1f | 213 | channel_register_fds(Channel *c, int rfd, int wfd, int efd, |
214 | int extusage, int nonblock) | |
8efc0c15 | 215 | { |
5260325f | 216 | /* Update the maximum file descriptor value. */ |
39929cdb | 217 | channel_max_fd = MAX(channel_max_fd, rfd); |
218 | channel_max_fd = MAX(channel_max_fd, wfd); | |
219 | channel_max_fd = MAX(channel_max_fd, efd); | |
220 | ||
aa3378df | 221 | /* XXX set close-on-exec -markus */ |
1d1ffb87 | 222 | |
0fbe8c74 | 223 | c->rfd = rfd; |
224 | c->wfd = wfd; | |
225 | c->sock = (rfd == wfd) ? rfd : -1; | |
5e96b616 | 226 | c->ctl_fd = -1; /* XXX: set elsewhere */ |
0fbe8c74 | 227 | c->efd = efd; |
228 | c->extended_usage = extusage; | |
a22aff1f | 229 | |
0ae4fe1d | 230 | /* XXX ugly hack: nonblock is only set by the server */ |
231 | if (nonblock && isatty(c->rfd)) { | |
d7ac5f18 | 232 | debug2("channel %d: rfd %d isatty", c->self, c->rfd); |
0ae4fe1d | 233 | c->isatty = 1; |
234 | if (!isatty(c->wfd)) { | |
94dfb550 | 235 | error("channel %d: wfd %d is not a tty?", |
0ae4fe1d | 236 | c->self, c->wfd); |
237 | } | |
238 | } else { | |
239 | c->isatty = 0; | |
240 | } | |
21c2c5cd | 241 | c->wfd_isatty = isatty(c->wfd); |
0ae4fe1d | 242 | |
a22aff1f | 243 | /* enable nonblocking mode */ |
244 | if (nonblock) { | |
245 | if (rfd != -1) | |
246 | set_nonblock(rfd); | |
247 | if (wfd != -1) | |
248 | set_nonblock(wfd); | |
249 | if (efd != -1) | |
250 | set_nonblock(efd); | |
251 | } | |
0fbe8c74 | 252 | } |
253 | ||
254 | /* | |
255 | * Allocate a new channel object and set its type and socket. This will cause | |
256 | * remote_name to be freed. | |
257 | */ | |
719fc62f | 258 | Channel * |
0fbe8c74 | 259 | channel_new(char *ctype, int type, int rfd, int wfd, int efd, |
f91d9a89 | 260 | u_int window, u_int maxpack, int extusage, char *remote_name, int nonblock) |
0fbe8c74 | 261 | { |
9a995072 | 262 | int found; |
263 | u_int i; | |
0fbe8c74 | 264 | Channel *c; |
5260325f | 265 | |
266 | /* Do initial allocation if this is the first call. */ | |
267 | if (channels_alloc == 0) { | |
268 | channels_alloc = 10; | |
52e3daed | 269 | channels = xcalloc(channels_alloc, sizeof(Channel *)); |
5260325f | 270 | for (i = 0; i < channels_alloc; i++) |
719fc62f | 271 | channels[i] = NULL; |
5260325f | 272 | } |
273 | /* Try to find a free slot where to put the new channel. */ | |
274 | for (found = -1, i = 0; i < channels_alloc; i++) | |
719fc62f | 275 | if (channels[i] == NULL) { |
5260325f | 276 | /* Found a free slot. */ |
9a995072 | 277 | found = (int)i; |
5260325f | 278 | break; |
279 | } | |
9a995072 | 280 | if (found < 0) { |
aa3378df | 281 | /* There are no free slots. Take last+1 slot and expand the array. */ |
5260325f | 282 | found = channels_alloc; |
5df8c731 | 283 | if (channels_alloc > 10000) |
284 | fatal("channel_new: internal error: channels_alloc %d " | |
285 | "too big.", channels_alloc); | |
c5d10563 | 286 | channels = xrealloc(channels, channels_alloc + 10, |
287 | sizeof(Channel *)); | |
20419cc1 | 288 | channels_alloc += 10; |
de273eef | 289 | debug2("channel: expanding %d", channels_alloc); |
5260325f | 290 | for (i = found; i < channels_alloc; i++) |
719fc62f | 291 | channels[i] = NULL; |
5260325f | 292 | } |
719fc62f | 293 | /* Initialize and return new channel. */ |
52e3daed | 294 | c = channels[found] = xcalloc(1, sizeof(Channel)); |
5260325f | 295 | buffer_init(&c->input); |
296 | buffer_init(&c->output); | |
7368a6c8 | 297 | buffer_init(&c->extended); |
70bef40e | 298 | c->ostate = CHAN_OUTPUT_OPEN; |
299 | c->istate = CHAN_INPUT_OPEN; | |
300 | c->flags = 0; | |
a22aff1f | 301 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock); |
5260325f | 302 | c->self = found; |
303 | c->type = type; | |
7368a6c8 | 304 | c->ctype = ctype; |
0b242b12 | 305 | c->local_window = window; |
306 | c->local_window_max = window; | |
307 | c->local_consumed = 0; | |
308 | c->local_maxpacket = maxpack; | |
5260325f | 309 | c->remote_id = -1; |
0d942eff | 310 | c->remote_name = xstrdup(remote_name); |
7368a6c8 | 311 | c->remote_window = 0; |
312 | c->remote_maxpacket = 0; | |
a5f82435 | 313 | c->force_drain = 0; |
ac151b18 | 314 | c->single_connection = 0; |
3cf2be58 | 315 | c->detach_user = NULL; |
8cd0437d | 316 | c->detach_close = 0; |
05ca0898 | 317 | c->confirm = NULL; |
5e96b616 | 318 | c->confirm_ctx = NULL; |
2e73a022 | 319 | c->input_filter = NULL; |
c1c6a032 | 320 | c->output_filter = NULL; |
5260325f | 321 | debug("channel %d: new [%s]", found, remote_name); |
719fc62f | 322 | return c; |
7368a6c8 | 323 | } |
8efc0c15 | 324 | |
489aa2e9 | 325 | static int |
326 | channel_find_maxfd(void) | |
327 | { | |
9a995072 | 328 | u_int i; |
329 | int max = 0; | |
489aa2e9 | 330 | Channel *c; |
331 | ||
332 | for (i = 0; i < channels_alloc; i++) { | |
333 | c = channels[i]; | |
334 | if (c != NULL) { | |
335 | max = MAX(max, c->rfd); | |
336 | max = MAX(max, c->wfd); | |
337 | max = MAX(max, c->efd); | |
338 | } | |
339 | } | |
340 | return max; | |
341 | } | |
342 | ||
343 | int | |
344 | channel_close_fd(int *fdp) | |
345 | { | |
346 | int ret = 0, fd = *fdp; | |
347 | ||
348 | if (fd != -1) { | |
349 | ret = close(fd); | |
350 | *fdp = -1; | |
351 | if (fd == channel_max_fd) | |
352 | channel_max_fd = channel_find_maxfd(); | |
353 | } | |
354 | return ret; | |
355 | } | |
356 | ||
0fbe8c74 | 357 | /* Close all channel fd/socket. */ |
396c147e | 358 | static void |
0fbe8c74 | 359 | channel_close_fds(Channel *c) |
360 | { | |
5e96b616 | 361 | debug3("channel %d: close_fds r %d w %d e %d c %d", |
362 | c->self, c->rfd, c->wfd, c->efd, c->ctl_fd); | |
6fd8622b | 363 | |
489aa2e9 | 364 | channel_close_fd(&c->sock); |
5e96b616 | 365 | channel_close_fd(&c->ctl_fd); |
489aa2e9 | 366 | channel_close_fd(&c->rfd); |
367 | channel_close_fd(&c->wfd); | |
368 | channel_close_fd(&c->efd); | |
0fbe8c74 | 369 | } |
370 | ||
8e7895b8 | 371 | /* Free the channel and close its fd/socket. */ |
8e7895b8 | 372 | void |
373 | channel_free(Channel *c) | |
374 | { | |
375 | char *s; | |
9a995072 | 376 | u_int i, n; |
8e7895b8 | 377 | |
378 | for (n = 0, i = 0; i < channels_alloc; i++) | |
379 | if (channels[i]) | |
380 | n++; | |
9a995072 | 381 | debug("channel %d: free: %s, nchannels %u", c->self, |
8e7895b8 | 382 | c->remote_name ? c->remote_name : "???", n); |
383 | ||
384 | s = channel_open_message(); | |
d7ac5f18 | 385 | debug3("channel %d: status: %s", c->self, s); |
8e7895b8 | 386 | xfree(s); |
387 | ||
8e7895b8 | 388 | if (c->sock != -1) |
389 | shutdown(c->sock, SHUT_RDWR); | |
5e96b616 | 390 | if (c->ctl_fd != -1) |
391 | shutdown(c->ctl_fd, SHUT_RDWR); | |
8e7895b8 | 392 | channel_close_fds(c); |
393 | buffer_free(&c->input); | |
394 | buffer_free(&c->output); | |
395 | buffer_free(&c->extended); | |
396 | if (c->remote_name) { | |
397 | xfree(c->remote_name); | |
398 | c->remote_name = NULL; | |
399 | } | |
400 | channels[c->self] = NULL; | |
401 | xfree(c); | |
402 | } | |
403 | ||
8e7895b8 | 404 | void |
d6746a0b | 405 | channel_free_all(void) |
8e7895b8 | 406 | { |
9a995072 | 407 | u_int i; |
8e7895b8 | 408 | |
d6746a0b | 409 | for (i = 0; i < channels_alloc; i++) |
410 | if (channels[i] != NULL) | |
411 | channel_free(channels[i]); | |
8e7895b8 | 412 | } |
413 | ||
414 | /* | |
415 | * Closes the sockets/fds of all channels. This is used to close extra file | |
416 | * descriptors after a fork. | |
417 | */ | |
8e7895b8 | 418 | void |
d5bb9418 | 419 | channel_close_all(void) |
8e7895b8 | 420 | { |
9a995072 | 421 | u_int i; |
8e7895b8 | 422 | |
423 | for (i = 0; i < channels_alloc; i++) | |
424 | if (channels[i] != NULL) | |
425 | channel_close_fds(channels[i]); | |
426 | } | |
427 | ||
3cf2be58 | 428 | /* |
429 | * Stop listening to channels. | |
430 | */ | |
3cf2be58 | 431 | void |
432 | channel_stop_listening(void) | |
433 | { | |
9a995072 | 434 | u_int i; |
3cf2be58 | 435 | Channel *c; |
436 | ||
437 | for (i = 0; i < channels_alloc; i++) { | |
438 | c = channels[i]; | |
439 | if (c != NULL) { | |
440 | switch (c->type) { | |
441 | case SSH_CHANNEL_AUTH_SOCKET: | |
442 | case SSH_CHANNEL_PORT_LISTENER: | |
443 | case SSH_CHANNEL_RPORT_LISTENER: | |
444 | case SSH_CHANNEL_X11_LISTENER: | |
489aa2e9 | 445 | channel_close_fd(&c->sock); |
3cf2be58 | 446 | channel_free(c); |
447 | break; | |
448 | } | |
449 | } | |
450 | } | |
451 | } | |
452 | ||
8e7895b8 | 453 | /* |
454 | * Returns true if no channel has too much buffered data, and false if one or | |
455 | * more channel is overfull. | |
456 | */ | |
8e7895b8 | 457 | int |
d5bb9418 | 458 | channel_not_very_much_buffered_data(void) |
8e7895b8 | 459 | { |
460 | u_int i; | |
461 | Channel *c; | |
462 | ||
463 | for (i = 0; i < channels_alloc; i++) { | |
464 | c = channels[i]; | |
465 | if (c != NULL && c->type == SSH_CHANNEL_OPEN) { | |
0c139bd1 | 466 | #if 0 |
467 | if (!compat20 && | |
468 | buffer_len(&c->input) > packet_get_maxsize()) { | |
faa483fa | 469 | debug2("channel %d: big input buffer %d", |
8e7895b8 | 470 | c->self, buffer_len(&c->input)); |
471 | return 0; | |
472 | } | |
0c139bd1 | 473 | #endif |
8e7895b8 | 474 | if (buffer_len(&c->output) > packet_get_maxsize()) { |
a27002e5 | 475 | debug2("channel %d: big output buffer %u > %u", |
0c139bd1 | 476 | c->self, buffer_len(&c->output), |
477 | packet_get_maxsize()); | |
8e7895b8 | 478 | return 0; |
479 | } | |
480 | } | |
481 | } | |
482 | return 1; | |
483 | } | |
484 | ||
485 | /* Returns true if any channel is still open. */ | |
8e7895b8 | 486 | int |
d5bb9418 | 487 | channel_still_open(void) |
8e7895b8 | 488 | { |
9a995072 | 489 | u_int i; |
8e7895b8 | 490 | Channel *c; |
491 | ||
492 | for (i = 0; i < channels_alloc; i++) { | |
493 | c = channels[i]; | |
494 | if (c == NULL) | |
495 | continue; | |
496 | switch (c->type) { | |
497 | case SSH_CHANNEL_X11_LISTENER: | |
498 | case SSH_CHANNEL_PORT_LISTENER: | |
499 | case SSH_CHANNEL_RPORT_LISTENER: | |
500 | case SSH_CHANNEL_CLOSED: | |
501 | case SSH_CHANNEL_AUTH_SOCKET: | |
502 | case SSH_CHANNEL_DYNAMIC: | |
503 | case SSH_CHANNEL_CONNECTING: | |
504 | case SSH_CHANNEL_ZOMBIE: | |
505 | continue; | |
506 | case SSH_CHANNEL_LARVAL: | |
507 | if (!compat20) | |
508 | fatal("cannot happen: SSH_CHANNEL_LARVAL"); | |
509 | continue; | |
510 | case SSH_CHANNEL_OPENING: | |
511 | case SSH_CHANNEL_OPEN: | |
512 | case SSH_CHANNEL_X11_OPEN: | |
513 | return 1; | |
514 | case SSH_CHANNEL_INPUT_DRAINING: | |
515 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
516 | if (!compat13) | |
517 | fatal("cannot happen: OUT_DRAIN"); | |
518 | return 1; | |
519 | default: | |
520 | fatal("channel_still_open: bad channel type %d", c->type); | |
521 | /* NOTREACHED */ | |
522 | } | |
523 | } | |
524 | return 0; | |
525 | } | |
526 | ||
527 | /* Returns the id of an open channel suitable for keepaliving */ | |
8e7895b8 | 528 | int |
d5bb9418 | 529 | channel_find_open(void) |
8e7895b8 | 530 | { |
9a995072 | 531 | u_int i; |
8e7895b8 | 532 | Channel *c; |
533 | ||
534 | for (i = 0; i < channels_alloc; i++) { | |
535 | c = channels[i]; | |
13de3560 | 536 | if (c == NULL || c->remote_id < 0) |
8e7895b8 | 537 | continue; |
538 | switch (c->type) { | |
539 | case SSH_CHANNEL_CLOSED: | |
540 | case SSH_CHANNEL_DYNAMIC: | |
541 | case SSH_CHANNEL_X11_LISTENER: | |
542 | case SSH_CHANNEL_PORT_LISTENER: | |
543 | case SSH_CHANNEL_RPORT_LISTENER: | |
544 | case SSH_CHANNEL_OPENING: | |
545 | case SSH_CHANNEL_CONNECTING: | |
546 | case SSH_CHANNEL_ZOMBIE: | |
547 | continue; | |
548 | case SSH_CHANNEL_LARVAL: | |
549 | case SSH_CHANNEL_AUTH_SOCKET: | |
550 | case SSH_CHANNEL_OPEN: | |
551 | case SSH_CHANNEL_X11_OPEN: | |
552 | return i; | |
553 | case SSH_CHANNEL_INPUT_DRAINING: | |
554 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
555 | if (!compat13) | |
556 | fatal("cannot happen: OUT_DRAIN"); | |
557 | return i; | |
558 | default: | |
559 | fatal("channel_find_open: bad channel type %d", c->type); | |
560 | /* NOTREACHED */ | |
561 | } | |
562 | } | |
563 | return -1; | |
564 | } | |
565 | ||
566 | ||
567 | /* | |
568 | * Returns a message describing the currently open forwarded connections, | |
569 | * suitable for sending to the client. The message contains crlf pairs for | |
570 | * newlines. | |
571 | */ | |
8e7895b8 | 572 | char * |
d5bb9418 | 573 | channel_open_message(void) |
8e7895b8 | 574 | { |
575 | Buffer buffer; | |
576 | Channel *c; | |
577 | char buf[1024], *cp; | |
9a995072 | 578 | u_int i; |
8e7895b8 | 579 | |
580 | buffer_init(&buffer); | |
581 | snprintf(buf, sizeof buf, "The following connections are open:\r\n"); | |
582 | buffer_append(&buffer, buf, strlen(buf)); | |
583 | for (i = 0; i < channels_alloc; i++) { | |
584 | c = channels[i]; | |
585 | if (c == NULL) | |
586 | continue; | |
587 | switch (c->type) { | |
588 | case SSH_CHANNEL_X11_LISTENER: | |
589 | case SSH_CHANNEL_PORT_LISTENER: | |
590 | case SSH_CHANNEL_RPORT_LISTENER: | |
591 | case SSH_CHANNEL_CLOSED: | |
592 | case SSH_CHANNEL_AUTH_SOCKET: | |
593 | case SSH_CHANNEL_ZOMBIE: | |
594 | continue; | |
595 | case SSH_CHANNEL_LARVAL: | |
596 | case SSH_CHANNEL_OPENING: | |
597 | case SSH_CHANNEL_CONNECTING: | |
598 | case SSH_CHANNEL_DYNAMIC: | |
599 | case SSH_CHANNEL_OPEN: | |
600 | case SSH_CHANNEL_X11_OPEN: | |
601 | case SSH_CHANNEL_INPUT_DRAINING: | |
602 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
5e96b616 | 603 | snprintf(buf, sizeof buf, |
604 | " #%d %.300s (t%d r%d i%d/%d o%d/%d fd %d/%d cfd %d)\r\n", | |
8e7895b8 | 605 | c->self, c->remote_name, |
606 | c->type, c->remote_id, | |
607 | c->istate, buffer_len(&c->input), | |
608 | c->ostate, buffer_len(&c->output), | |
5e96b616 | 609 | c->rfd, c->wfd, c->ctl_fd); |
8e7895b8 | 610 | buffer_append(&buffer, buf, strlen(buf)); |
611 | continue; | |
612 | default: | |
613 | fatal("channel_open_message: bad channel type %d", c->type); | |
614 | /* NOTREACHED */ | |
615 | } | |
616 | } | |
617 | buffer_append(&buffer, "\0", 1); | |
618 | cp = xstrdup(buffer_ptr(&buffer)); | |
619 | buffer_free(&buffer); | |
620 | return cp; | |
621 | } | |
622 | ||
623 | void | |
624 | channel_send_open(int id) | |
625 | { | |
626 | Channel *c = channel_lookup(id); | |
e1feb9bf | 627 | |
8e7895b8 | 628 | if (c == NULL) { |
bbe88b6d | 629 | logit("channel_send_open: %d: bad id", id); |
8e7895b8 | 630 | return; |
631 | } | |
6226a8f8 | 632 | debug2("channel %d: send open", id); |
8e7895b8 | 633 | packet_start(SSH2_MSG_CHANNEL_OPEN); |
634 | packet_put_cstring(c->ctype); | |
635 | packet_put_int(c->self); | |
636 | packet_put_int(c->local_window); | |
637 | packet_put_int(c->local_maxpacket); | |
638 | packet_send(); | |
639 | } | |
640 | ||
641 | void | |
6226a8f8 | 642 | channel_request_start(int id, char *service, int wantconfirm) |
8e7895b8 | 643 | { |
6226a8f8 | 644 | Channel *c = channel_lookup(id); |
e1feb9bf | 645 | |
8e7895b8 | 646 | if (c == NULL) { |
bbe88b6d | 647 | logit("channel_request_start: %d: unknown channel id", id); |
8e7895b8 | 648 | return; |
649 | } | |
5e96b616 | 650 | debug2("channel %d: request %s confirm %d", id, service, wantconfirm); |
8e7895b8 | 651 | packet_start(SSH2_MSG_CHANNEL_REQUEST); |
652 | packet_put_int(c->remote_id); | |
653 | packet_put_cstring(service); | |
654 | packet_put_char(wantconfirm); | |
655 | } | |
a7137f6b | 656 | |
8e7895b8 | 657 | void |
5e96b616 | 658 | channel_register_confirm(int id, channel_callback_fn *fn, void *ctx) |
8e7895b8 | 659 | { |
660 | Channel *c = channel_lookup(id); | |
e1feb9bf | 661 | |
8e7895b8 | 662 | if (c == NULL) { |
bbe88b6d | 663 | logit("channel_register_comfirm: %d: bad id", id); |
8e7895b8 | 664 | return; |
665 | } | |
05ca0898 | 666 | c->confirm = fn; |
5e96b616 | 667 | c->confirm_ctx = ctx; |
8e7895b8 | 668 | } |
a7137f6b | 669 | |
8e7895b8 | 670 | void |
8cd0437d | 671 | channel_register_cleanup(int id, channel_callback_fn *fn, int do_close) |
8e7895b8 | 672 | { |
b872f7f0 | 673 | Channel *c = channel_by_id(id); |
e1feb9bf | 674 | |
8e7895b8 | 675 | if (c == NULL) { |
bbe88b6d | 676 | logit("channel_register_cleanup: %d: bad id", id); |
8e7895b8 | 677 | return; |
678 | } | |
3cf2be58 | 679 | c->detach_user = fn; |
8cd0437d | 680 | c->detach_close = do_close; |
8e7895b8 | 681 | } |
a7137f6b | 682 | |
8e7895b8 | 683 | void |
684 | channel_cancel_cleanup(int id) | |
685 | { | |
b872f7f0 | 686 | Channel *c = channel_by_id(id); |
e1feb9bf | 687 | |
8e7895b8 | 688 | if (c == NULL) { |
bbe88b6d | 689 | logit("channel_cancel_cleanup: %d: bad id", id); |
8e7895b8 | 690 | return; |
691 | } | |
3cf2be58 | 692 | c->detach_user = NULL; |
8cd0437d | 693 | c->detach_close = 0; |
8e7895b8 | 694 | } |
a7137f6b | 695 | |
8e7895b8 | 696 | void |
c1c6a032 | 697 | channel_register_filter(int id, channel_infilter_fn *ifn, |
698 | channel_outfilter_fn *ofn) | |
8e7895b8 | 699 | { |
700 | Channel *c = channel_lookup(id); | |
e1feb9bf | 701 | |
8e7895b8 | 702 | if (c == NULL) { |
bbe88b6d | 703 | logit("channel_register_filter: %d: bad id", id); |
8e7895b8 | 704 | return; |
705 | } | |
c1c6a032 | 706 | c->input_filter = ifn; |
707 | c->output_filter = ofn; | |
8e7895b8 | 708 | } |
709 | ||
6ae2364d | 710 | void |
8e7895b8 | 711 | channel_set_fds(int id, int rfd, int wfd, int efd, |
399d1ea6 | 712 | int extusage, int nonblock, u_int window_max) |
8efc0c15 | 713 | { |
8e7895b8 | 714 | Channel *c = channel_lookup(id); |
e1feb9bf | 715 | |
8e7895b8 | 716 | if (c == NULL || c->type != SSH_CHANNEL_LARVAL) |
717 | fatal("channel_activate for non-larval channel %d.", id); | |
718 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock); | |
719 | c->type = SSH_CHANNEL_OPEN; | |
399d1ea6 | 720 | c->local_window = c->local_window_max = window_max; |
8e7895b8 | 721 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
722 | packet_put_int(c->remote_id); | |
723 | packet_put_int(c->local_window); | |
724 | packet_send(); | |
8efc0c15 | 725 | } |
726 | ||
aa3378df | 727 | /* |
7368a6c8 | 728 | * 'channel_pre*' are called just before select() to add any bits relevant to |
729 | * channels in the select bitmasks. | |
aa3378df | 730 | */ |
7368a6c8 | 731 | /* |
732 | * 'channel_post*': perform any appropriate operations for channels which | |
733 | * have events pending. | |
734 | */ | |
c8e9c167 | 735 | typedef void chan_fn(Channel *c, fd_set *readset, fd_set *writeset); |
7368a6c8 | 736 | chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE]; |
737 | chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE]; | |
8efc0c15 | 738 | |
ebb90778 | 739 | /* ARGSUSED */ |
396c147e | 740 | static void |
c8e9c167 | 741 | channel_pre_listener(Channel *c, fd_set *readset, fd_set *writeset) |
8efc0c15 | 742 | { |
7368a6c8 | 743 | FD_SET(c->sock, readset); |
744 | } | |
5260325f | 745 | |
ebb90778 | 746 | /* ARGSUSED */ |
396c147e | 747 | static void |
c8e9c167 | 748 | channel_pre_connecting(Channel *c, fd_set *readset, fd_set *writeset) |
97fb6912 | 749 | { |
750 | debug3("channel %d: waiting for connection", c->self); | |
751 | FD_SET(c->sock, writeset); | |
752 | } | |
753 | ||
396c147e | 754 | static void |
c8e9c167 | 755 | channel_pre_open_13(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 756 | { |
757 | if (buffer_len(&c->input) < packet_get_maxsize()) | |
758 | FD_SET(c->sock, readset); | |
759 | if (buffer_len(&c->output) > 0) | |
760 | FD_SET(c->sock, writeset); | |
761 | } | |
5260325f | 762 | |
396c147e | 763 | static void |
c8e9c167 | 764 | channel_pre_open(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 765 | { |
0c0738d5 | 766 | u_int limit = compat20 ? c->remote_window : packet_get_maxsize(); |
5260325f | 767 | |
7e7327a1 | 768 | if (c->istate == CHAN_INPUT_OPEN && |
0c0738d5 | 769 | limit > 0 && |
69d9d413 | 770 | buffer_len(&c->input) < limit && |
771 | buffer_check_alloc(&c->input, CHAN_RBUF)) | |
7e7327a1 | 772 | FD_SET(c->rfd, readset); |
773 | if (c->ostate == CHAN_OUTPUT_OPEN || | |
774 | c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { | |
775 | if (buffer_len(&c->output) > 0) { | |
776 | FD_SET(c->wfd, writeset); | |
777 | } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { | |
d2296ed7 | 778 | if (CHANNEL_EFD_OUTPUT_ACTIVE(c)) |
4e2e5cfd | 779 | debug2("channel %d: obuf_empty delayed efd %d/(%d)", |
780 | c->self, c->efd, buffer_len(&c->extended)); | |
d2296ed7 | 781 | else |
782 | chan_obuf_empty(c); | |
7e7327a1 | 783 | } |
784 | } | |
785 | /** XXX check close conditions, too */ | |
0c0738d5 | 786 | if (compat20 && c->efd != -1) { |
7e7327a1 | 787 | if (c->extended_usage == CHAN_EXTENDED_WRITE && |
788 | buffer_len(&c->extended) > 0) | |
789 | FD_SET(c->efd, writeset); | |
d2296ed7 | 790 | else if (!(c->flags & CHAN_EOF_SENT) && |
791 | c->extended_usage == CHAN_EXTENDED_READ && | |
7e7327a1 | 792 | buffer_len(&c->extended) < c->remote_window) |
793 | FD_SET(c->efd, readset); | |
794 | } | |
5e96b616 | 795 | /* XXX: What about efd? races? */ |
f2107e97 | 796 | if (compat20 && c->ctl_fd != -1 && |
5e96b616 | 797 | c->istate == CHAN_INPUT_OPEN && c->ostate == CHAN_OUTPUT_OPEN) |
798 | FD_SET(c->ctl_fd, readset); | |
7e7327a1 | 799 | } |
800 | ||
ebb90778 | 801 | /* ARGSUSED */ |
396c147e | 802 | static void |
c8e9c167 | 803 | channel_pre_input_draining(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 804 | { |
805 | if (buffer_len(&c->input) == 0) { | |
806 | packet_start(SSH_MSG_CHANNEL_CLOSE); | |
807 | packet_put_int(c->remote_id); | |
808 | packet_send(); | |
809 | c->type = SSH_CHANNEL_CLOSED; | |
d7ac5f18 | 810 | debug2("channel %d: closing after input drain.", c->self); |
7368a6c8 | 811 | } |
812 | } | |
5260325f | 813 | |
ebb90778 | 814 | /* ARGSUSED */ |
396c147e | 815 | static void |
c8e9c167 | 816 | channel_pre_output_draining(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 817 | { |
818 | if (buffer_len(&c->output) == 0) | |
719fc62f | 819 | chan_mark_dead(c); |
6ae2364d | 820 | else |
7368a6c8 | 821 | FD_SET(c->sock, writeset); |
822 | } | |
5260325f | 823 | |
7368a6c8 | 824 | /* |
825 | * This is a special state for X11 authentication spoofing. An opened X11 | |
826 | * connection (when authentication spoofing is being done) remains in this | |
827 | * state until the first packet has been completely read. The authentication | |
828 | * data in that packet is then substituted by the real data if it matches the | |
829 | * fake data, and the channel is put into normal mode. | |
0b242b12 | 830 | * XXX All this happens at the client side. |
8e7895b8 | 831 | * Returns: 0 = need more data, -1 = wrong cookie, 1 = ok |
7368a6c8 | 832 | */ |
396c147e | 833 | static int |
8e7895b8 | 834 | x11_open_helper(Buffer *b) |
7368a6c8 | 835 | { |
1e3b8b07 | 836 | u_char *ucp; |
837 | u_int proto_len, data_len; | |
5260325f | 838 | |
7368a6c8 | 839 | /* Check if the fixed size part of the packet is in buffer. */ |
8e7895b8 | 840 | if (buffer_len(b) < 12) |
7368a6c8 | 841 | return 0; |
842 | ||
843 | /* Parse the lengths of variable-length fields. */ | |
20905a8e | 844 | ucp = buffer_ptr(b); |
7368a6c8 | 845 | if (ucp[0] == 0x42) { /* Byte order MSB first. */ |
846 | proto_len = 256 * ucp[6] + ucp[7]; | |
847 | data_len = 256 * ucp[8] + ucp[9]; | |
848 | } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */ | |
849 | proto_len = ucp[6] + 256 * ucp[7]; | |
850 | data_len = ucp[8] + 256 * ucp[9]; | |
851 | } else { | |
d7ac5f18 | 852 | debug2("Initial X11 packet contains bad byte order byte: 0x%x", |
184eed6a | 853 | ucp[0]); |
7368a6c8 | 854 | return -1; |
855 | } | |
5260325f | 856 | |
7368a6c8 | 857 | /* Check if the whole packet is in buffer. */ |
8e7895b8 | 858 | if (buffer_len(b) < |
7368a6c8 | 859 | 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3)) |
860 | return 0; | |
5260325f | 861 | |
7368a6c8 | 862 | /* Check if authentication protocol matches. */ |
863 | if (proto_len != strlen(x11_saved_proto) || | |
864 | memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) { | |
d7ac5f18 | 865 | debug2("X11 connection uses different authentication protocol."); |
7368a6c8 | 866 | return -1; |
867 | } | |
868 | /* Check if authentication data matches our fake data. */ | |
869 | if (data_len != x11_fake_data_len || | |
870 | memcmp(ucp + 12 + ((proto_len + 3) & ~3), | |
871 | x11_fake_data, x11_fake_data_len) != 0) { | |
d7ac5f18 | 872 | debug2("X11 auth data does not match fake data."); |
7368a6c8 | 873 | return -1; |
874 | } | |
875 | /* Check fake data length */ | |
876 | if (x11_fake_data_len != x11_saved_data_len) { | |
877 | error("X11 fake_data_len %d != saved_data_len %d", | |
878 | x11_fake_data_len, x11_saved_data_len); | |
879 | return -1; | |
880 | } | |
881 | /* | |
882 | * Received authentication protocol and data match | |
883 | * our fake data. Substitute the fake data with real | |
884 | * data. | |
885 | */ | |
886 | memcpy(ucp + 12 + ((proto_len + 3) & ~3), | |
887 | x11_saved_data, x11_saved_data_len); | |
888 | return 1; | |
889 | } | |
5260325f | 890 | |
396c147e | 891 | static void |
c8e9c167 | 892 | channel_pre_x11_open_13(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 893 | { |
8e7895b8 | 894 | int ret = x11_open_helper(&c->output); |
e1feb9bf | 895 | |
7368a6c8 | 896 | if (ret == 1) { |
897 | /* Start normal processing for the channel. */ | |
898 | c->type = SSH_CHANNEL_OPEN; | |
a8be9f80 | 899 | channel_pre_open_13(c, readset, writeset); |
7368a6c8 | 900 | } else if (ret == -1) { |
901 | /* | |
902 | * We have received an X11 connection that has bad | |
903 | * authentication information. | |
904 | */ | |
bbe88b6d | 905 | logit("X11 connection rejected because of wrong authentication."); |
7368a6c8 | 906 | buffer_clear(&c->input); |
907 | buffer_clear(&c->output); | |
489aa2e9 | 908 | channel_close_fd(&c->sock); |
7368a6c8 | 909 | c->sock = -1; |
910 | c->type = SSH_CHANNEL_CLOSED; | |
911 | packet_start(SSH_MSG_CHANNEL_CLOSE); | |
912 | packet_put_int(c->remote_id); | |
913 | packet_send(); | |
914 | } | |
915 | } | |
5260325f | 916 | |
396c147e | 917 | static void |
c8e9c167 | 918 | channel_pre_x11_open(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 919 | { |
8e7895b8 | 920 | int ret = x11_open_helper(&c->output); |
a5f82435 | 921 | |
922 | /* c->force_drain = 1; */ | |
923 | ||
7368a6c8 | 924 | if (ret == 1) { |
925 | c->type = SSH_CHANNEL_OPEN; | |
0c0738d5 | 926 | channel_pre_open(c, readset, writeset); |
7368a6c8 | 927 | } else if (ret == -1) { |
bbe88b6d | 928 | logit("X11 connection rejected because of wrong authentication."); |
d7ac5f18 | 929 | debug2("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate); |
8341f420 | 930 | chan_read_failed(c); |
931 | buffer_clear(&c->input); | |
932 | chan_ibuf_empty(c); | |
933 | buffer_clear(&c->output); | |
934 | /* for proto v1, the peer will send an IEOF */ | |
935 | if (compat20) | |
936 | chan_write_failed(c); | |
937 | else | |
938 | c->type = SSH_CHANNEL_OPEN; | |
d7ac5f18 | 939 | debug2("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate); |
7368a6c8 | 940 | } |
941 | } | |
5260325f | 942 | |
28b9cb4d | 943 | /* try to decode a socks4 header */ |
ebb90778 | 944 | /* ARGSUSED */ |
396c147e | 945 | static int |
c8e9c167 | 946 | channel_decode_socks4(Channel *c, fd_set *readset, fd_set *writeset) |
0490e609 | 947 | { |
661e45a0 | 948 | char *p, *host; |
2ceb8101 | 949 | u_int len, have, i, found; |
184eed6a | 950 | char username[256]; |
0490e609 | 951 | struct { |
952 | u_int8_t version; | |
953 | u_int8_t command; | |
954 | u_int16_t dest_port; | |
28b9cb4d | 955 | struct in_addr dest_addr; |
0490e609 | 956 | } s4_req, s4_rsp; |
957 | ||
28b9cb4d | 958 | debug2("channel %d: decode socks4", c->self); |
53b8fe68 | 959 | |
960 | have = buffer_len(&c->input); | |
961 | len = sizeof(s4_req); | |
962 | if (have < len) | |
963 | return 0; | |
964 | p = buffer_ptr(&c->input); | |
965 | for (found = 0, i = len; i < have; i++) { | |
966 | if (p[i] == '\0') { | |
967 | found = 1; | |
968 | break; | |
969 | } | |
970 | if (i > 1024) { | |
971 | /* the peer is probably sending garbage */ | |
972 | debug("channel %d: decode socks4: too long", | |
973 | c->self); | |
974 | return -1; | |
975 | } | |
976 | } | |
977 | if (!found) | |
978 | return 0; | |
0490e609 | 979 | buffer_get(&c->input, (char *)&s4_req.version, 1); |
980 | buffer_get(&c->input, (char *)&s4_req.command, 1); | |
981 | buffer_get(&c->input, (char *)&s4_req.dest_port, 2); | |
28b9cb4d | 982 | buffer_get(&c->input, (char *)&s4_req.dest_addr, 4); |
53b8fe68 | 983 | have = buffer_len(&c->input); |
0490e609 | 984 | p = buffer_ptr(&c->input); |
985 | len = strlen(p); | |
6683b40f | 986 | debug2("channel %d: decode socks4: user %s/%d", c->self, p, len); |
0490e609 | 987 | if (len > have) |
28b9cb4d | 988 | fatal("channel %d: decode socks4: len %d > have %d", |
0490e609 | 989 | c->self, len, have); |
990 | strlcpy(username, p, sizeof(username)); | |
991 | buffer_consume(&c->input, len); | |
992 | buffer_consume(&c->input, 1); /* trailing '\0' */ | |
993 | ||
28b9cb4d | 994 | host = inet_ntoa(s4_req.dest_addr); |
0490e609 | 995 | strlcpy(c->path, host, sizeof(c->path)); |
996 | c->host_port = ntohs(s4_req.dest_port); | |
184eed6a | 997 | |
d7ac5f18 | 998 | debug2("channel %d: dynamic request: socks4 host %s port %u command %u", |
6683b40f | 999 | c->self, host, c->host_port, s4_req.command); |
0490e609 | 1000 | |
28b9cb4d | 1001 | if (s4_req.command != 1) { |
1002 | debug("channel %d: cannot handle: socks4 cn %d", | |
1003 | c->self, s4_req.command); | |
1004 | return -1; | |
0490e609 | 1005 | } |
28b9cb4d | 1006 | s4_rsp.version = 0; /* vn: 0 for reply */ |
1007 | s4_rsp.command = 90; /* cd: req granted */ | |
0490e609 | 1008 | s4_rsp.dest_port = 0; /* ignored */ |
28b9cb4d | 1009 | s4_rsp.dest_addr.s_addr = INADDR_ANY; /* ignored */ |
15dd2c4f | 1010 | buffer_append(&c->output, &s4_rsp, sizeof(s4_rsp)); |
28b9cb4d | 1011 | return 1; |
0490e609 | 1012 | } |
1013 | ||
f49658f5 | 1014 | /* try to decode a socks5 header */ |
1015 | #define SSH_SOCKS5_AUTHDONE 0x1000 | |
1016 | #define SSH_SOCKS5_NOAUTH 0x00 | |
1017 | #define SSH_SOCKS5_IPV4 0x01 | |
1018 | #define SSH_SOCKS5_DOMAIN 0x03 | |
1019 | #define SSH_SOCKS5_IPV6 0x04 | |
1020 | #define SSH_SOCKS5_CONNECT 0x01 | |
1021 | #define SSH_SOCKS5_SUCCESS 0x00 | |
1022 | ||
ebb90778 | 1023 | /* ARGSUSED */ |
f49658f5 | 1024 | static int |
c8e9c167 | 1025 | channel_decode_socks5(Channel *c, fd_set *readset, fd_set *writeset) |
f49658f5 | 1026 | { |
1027 | struct { | |
1028 | u_int8_t version; | |
1029 | u_int8_t command; | |
1030 | u_int8_t reserved; | |
1031 | u_int8_t atyp; | |
1032 | } s5_req, s5_rsp; | |
1033 | u_int16_t dest_port; | |
1034 | u_char *p, dest_addr[255+1]; | |
a217e418 | 1035 | u_int have, need, i, found, nmethods, addrlen, af; |
f49658f5 | 1036 | |
1037 | debug2("channel %d: decode socks5", c->self); | |
1038 | p = buffer_ptr(&c->input); | |
1039 | if (p[0] != 0x05) | |
1040 | return -1; | |
1041 | have = buffer_len(&c->input); | |
1042 | if (!(c->flags & SSH_SOCKS5_AUTHDONE)) { | |
1043 | /* format: ver | nmethods | methods */ | |
aff51935 | 1044 | if (have < 2) |
f49658f5 | 1045 | return 0; |
1046 | nmethods = p[1]; | |
1047 | if (have < nmethods + 2) | |
1048 | return 0; | |
1049 | /* look for method: "NO AUTHENTICATION REQUIRED" */ | |
1050 | for (found = 0, i = 2 ; i < nmethods + 2; i++) { | |
1051 | if (p[i] == SSH_SOCKS5_NOAUTH ) { | |
1052 | found = 1; | |
1053 | break; | |
1054 | } | |
1055 | } | |
1056 | if (!found) { | |
1057 | debug("channel %d: method SSH_SOCKS5_NOAUTH not found", | |
1058 | c->self); | |
1059 | return -1; | |
1060 | } | |
1061 | buffer_consume(&c->input, nmethods + 2); | |
1062 | buffer_put_char(&c->output, 0x05); /* version */ | |
1063 | buffer_put_char(&c->output, SSH_SOCKS5_NOAUTH); /* method */ | |
1064 | FD_SET(c->sock, writeset); | |
1065 | c->flags |= SSH_SOCKS5_AUTHDONE; | |
1066 | debug2("channel %d: socks5 auth done", c->self); | |
1067 | return 0; /* need more */ | |
1068 | } | |
1069 | debug2("channel %d: socks5 post auth", c->self); | |
1070 | if (have < sizeof(s5_req)+1) | |
1071 | return 0; /* need more */ | |
5b5f6af7 | 1072 | memcpy(&s5_req, p, sizeof(s5_req)); |
f49658f5 | 1073 | if (s5_req.version != 0x05 || |
1074 | s5_req.command != SSH_SOCKS5_CONNECT || | |
1075 | s5_req.reserved != 0x00) { | |
d7ac5f18 | 1076 | debug2("channel %d: only socks5 connect supported", c->self); |
f49658f5 | 1077 | return -1; |
1078 | } | |
f8cc7664 | 1079 | switch (s5_req.atyp){ |
f49658f5 | 1080 | case SSH_SOCKS5_IPV4: |
1081 | addrlen = 4; | |
1082 | af = AF_INET; | |
1083 | break; | |
1084 | case SSH_SOCKS5_DOMAIN: | |
1085 | addrlen = p[sizeof(s5_req)]; | |
1086 | af = -1; | |
1087 | break; | |
1088 | case SSH_SOCKS5_IPV6: | |
1089 | addrlen = 16; | |
1090 | af = AF_INET6; | |
1091 | break; | |
1092 | default: | |
d7ac5f18 | 1093 | debug2("channel %d: bad socks5 atyp %d", c->self, s5_req.atyp); |
f49658f5 | 1094 | return -1; |
1095 | } | |
a217e418 | 1096 | need = sizeof(s5_req) + addrlen + 2; |
1097 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) | |
1098 | need++; | |
1099 | if (have < need) | |
f49658f5 | 1100 | return 0; |
1101 | buffer_consume(&c->input, sizeof(s5_req)); | |
1102 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) | |
1103 | buffer_consume(&c->input, 1); /* host string length */ | |
1104 | buffer_get(&c->input, (char *)&dest_addr, addrlen); | |
1105 | buffer_get(&c->input, (char *)&dest_port, 2); | |
1106 | dest_addr[addrlen] = '\0'; | |
1107 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) | |
f6be21a0 | 1108 | strlcpy(c->path, (char *)dest_addr, sizeof(c->path)); |
f49658f5 | 1109 | else if (inet_ntop(af, dest_addr, c->path, sizeof(c->path)) == NULL) |
1110 | return -1; | |
1111 | c->host_port = ntohs(dest_port); | |
b6453d99 | 1112 | |
d7ac5f18 | 1113 | debug2("channel %d: dynamic request: socks5 host %s port %u command %u", |
f49658f5 | 1114 | c->self, c->path, c->host_port, s5_req.command); |
1115 | ||
1116 | s5_rsp.version = 0x05; | |
1117 | s5_rsp.command = SSH_SOCKS5_SUCCESS; | |
1118 | s5_rsp.reserved = 0; /* ignored */ | |
1119 | s5_rsp.atyp = SSH_SOCKS5_IPV4; | |
1120 | ((struct in_addr *)&dest_addr)->s_addr = INADDR_ANY; | |
1121 | dest_port = 0; /* ignored */ | |
1122 | ||
15dd2c4f | 1123 | buffer_append(&c->output, &s5_rsp, sizeof(s5_rsp)); |
1124 | buffer_append(&c->output, &dest_addr, sizeof(struct in_addr)); | |
1125 | buffer_append(&c->output, &dest_port, sizeof(dest_port)); | |
f49658f5 | 1126 | return 1; |
1127 | } | |
1128 | ||
28b9cb4d | 1129 | /* dynamic port forwarding */ |
396c147e | 1130 | static void |
c8e9c167 | 1131 | channel_pre_dynamic(Channel *c, fd_set *readset, fd_set *writeset) |
28b9cb4d | 1132 | { |
1133 | u_char *p; | |
2ceb8101 | 1134 | u_int have; |
1135 | int ret; | |
28b9cb4d | 1136 | |
1137 | have = buffer_len(&c->input); | |
639cb8ab | 1138 | c->delayed = 0; |
28b9cb4d | 1139 | debug2("channel %d: pre_dynamic: have %d", c->self, have); |
070adba2 | 1140 | /* buffer_dump(&c->input); */ |
28b9cb4d | 1141 | /* check if the fixed size part of the packet is in buffer. */ |
f49658f5 | 1142 | if (have < 3) { |
28b9cb4d | 1143 | /* need more */ |
1144 | FD_SET(c->sock, readset); | |
1145 | return; | |
1146 | } | |
1147 | /* try to guess the protocol */ | |
1148 | p = buffer_ptr(&c->input); | |
1149 | switch (p[0]) { | |
6683b40f | 1150 | case 0x04: |
1151 | ret = channel_decode_socks4(c, readset, writeset); | |
1152 | break; | |
f49658f5 | 1153 | case 0x05: |
1154 | ret = channel_decode_socks5(c, readset, writeset); | |
1155 | break; | |
28b9cb4d | 1156 | default: |
1157 | ret = -1; | |
1158 | break; | |
1159 | } | |
1160 | if (ret < 0) { | |
719fc62f | 1161 | chan_mark_dead(c); |
28b9cb4d | 1162 | } else if (ret == 0) { |
1163 | debug2("channel %d: pre_dynamic: need more", c->self); | |
1164 | /* need more */ | |
1165 | FD_SET(c->sock, readset); | |
1166 | } else { | |
1167 | /* switch to the next state */ | |
1168 | c->type = SSH_CHANNEL_OPENING; | |
1169 | port_open_helper(c, "direct-tcpip"); | |
1170 | } | |
1171 | } | |
0490e609 | 1172 | |
7368a6c8 | 1173 | /* This is our fake X11 server socket. */ |
ebb90778 | 1174 | /* ARGSUSED */ |
396c147e | 1175 | static void |
c8e9c167 | 1176 | channel_post_x11_listener(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1177 | { |
719fc62f | 1178 | Channel *nc; |
7368a6c8 | 1179 | struct sockaddr addr; |
bcc0381e | 1180 | int newsock; |
7368a6c8 | 1181 | socklen_t addrlen; |
865ac82e | 1182 | char buf[16384], *remote_ipaddr; |
0b242b12 | 1183 | int remote_port; |
7368a6c8 | 1184 | |
1185 | if (FD_ISSET(c->sock, readset)) { | |
1186 | debug("X11 connection requested."); | |
1187 | addrlen = sizeof(addr); | |
1188 | newsock = accept(c->sock, &addr, &addrlen); | |
ac151b18 | 1189 | if (c->single_connection) { |
d7ac5f18 | 1190 | debug2("single_connection: closing X11 listener."); |
ac151b18 | 1191 | channel_close_fd(&c->sock); |
1192 | chan_mark_dead(c); | |
1193 | } | |
7368a6c8 | 1194 | if (newsock < 0) { |
1195 | error("accept: %.100s", strerror(errno)); | |
1196 | return; | |
5260325f | 1197 | } |
bcc0381e | 1198 | set_nodelay(newsock); |
865ac82e | 1199 | remote_ipaddr = get_peer_ipaddr(newsock); |
0b242b12 | 1200 | remote_port = get_peer_port(newsock); |
7368a6c8 | 1201 | snprintf(buf, sizeof buf, "X11 connection from %.200s port %d", |
865ac82e | 1202 | remote_ipaddr, remote_port); |
0b242b12 | 1203 | |
719fc62f | 1204 | nc = channel_new("accepted x11 socket", |
0b242b12 | 1205 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
0d942eff | 1206 | c->local_window_max, c->local_maxpacket, 0, buf, 1); |
0b242b12 | 1207 | if (compat20) { |
1208 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1209 | packet_put_cstring("x11"); | |
719fc62f | 1210 | packet_put_int(nc->self); |
ac151b18 | 1211 | packet_put_int(nc->local_window_max); |
1212 | packet_put_int(nc->local_maxpacket); | |
865ac82e | 1213 | /* originator ipaddr and port */ |
1214 | packet_put_cstring(remote_ipaddr); | |
d0c832f3 | 1215 | if (datafellows & SSH_BUG_X11FWD) { |
d7ac5f18 | 1216 | debug2("ssh2 x11 bug compat mode"); |
d0c832f3 | 1217 | } else { |
1218 | packet_put_int(remote_port); | |
1219 | } | |
0b242b12 | 1220 | packet_send(); |
1221 | } else { | |
1222 | packet_start(SSH_SMSG_X11_OPEN); | |
719fc62f | 1223 | packet_put_int(nc->self); |
8e7895b8 | 1224 | if (packet_get_protocol_flags() & |
1225 | SSH_PROTOFLAG_HOST_IN_FWD_OPEN) | |
449c5ba5 | 1226 | packet_put_cstring(buf); |
0b242b12 | 1227 | packet_send(); |
1228 | } | |
865ac82e | 1229 | xfree(remote_ipaddr); |
8efc0c15 | 1230 | } |
8efc0c15 | 1231 | } |
1232 | ||
396c147e | 1233 | static void |
0490e609 | 1234 | port_open_helper(Channel *c, char *rtype) |
1235 | { | |
1236 | int direct; | |
1237 | char buf[1024]; | |
1238 | char *remote_ipaddr = get_peer_ipaddr(c->sock); | |
29798ed0 | 1239 | int remote_port = get_peer_port(c->sock); |
0490e609 | 1240 | |
1241 | direct = (strcmp(rtype, "direct-tcpip") == 0); | |
1242 | ||
1243 | snprintf(buf, sizeof buf, | |
1244 | "%s: listening port %d for %.100s port %d, " | |
1245 | "connect from %.200s port %d", | |
1246 | rtype, c->listening_port, c->path, c->host_port, | |
1247 | remote_ipaddr, remote_port); | |
1248 | ||
1249 | xfree(c->remote_name); | |
1250 | c->remote_name = xstrdup(buf); | |
1251 | ||
1252 | if (compat20) { | |
1253 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1254 | packet_put_cstring(rtype); | |
1255 | packet_put_int(c->self); | |
1256 | packet_put_int(c->local_window_max); | |
1257 | packet_put_int(c->local_maxpacket); | |
1258 | if (direct) { | |
1259 | /* target host, port */ | |
1260 | packet_put_cstring(c->path); | |
1261 | packet_put_int(c->host_port); | |
1262 | } else { | |
1263 | /* listen address, port */ | |
1264 | packet_put_cstring(c->path); | |
1265 | packet_put_int(c->listening_port); | |
1266 | } | |
1267 | /* originator host and port */ | |
1268 | packet_put_cstring(remote_ipaddr); | |
29798ed0 | 1269 | packet_put_int((u_int)remote_port); |
0490e609 | 1270 | packet_send(); |
1271 | } else { | |
1272 | packet_start(SSH_MSG_PORT_OPEN); | |
1273 | packet_put_int(c->self); | |
1274 | packet_put_cstring(c->path); | |
1275 | packet_put_int(c->host_port); | |
8e7895b8 | 1276 | if (packet_get_protocol_flags() & |
1277 | SSH_PROTOFLAG_HOST_IN_FWD_OPEN) | |
0490e609 | 1278 | packet_put_cstring(c->remote_name); |
1279 | packet_send(); | |
1280 | } | |
1281 | xfree(remote_ipaddr); | |
1282 | } | |
1283 | ||
442aee3a | 1284 | static void |
1285 | channel_set_reuseaddr(int fd) | |
1286 | { | |
1287 | int on = 1; | |
1288 | ||
1289 | /* | |
1290 | * Set socket options. | |
1291 | * Allow local port reuse in TIME_WAIT. | |
1292 | */ | |
1293 | if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1) | |
1294 | error("setsockopt SO_REUSEADDR fd %d: %s", fd, strerror(errno)); | |
1295 | } | |
1296 | ||
aa3378df | 1297 | /* |
7368a6c8 | 1298 | * This socket is listening for connections to a forwarded TCP/IP port. |
aa3378df | 1299 | */ |
ebb90778 | 1300 | /* ARGSUSED */ |
396c147e | 1301 | static void |
c8e9c167 | 1302 | channel_post_port_listener(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1303 | { |
0490e609 | 1304 | Channel *nc; |
7368a6c8 | 1305 | struct sockaddr addr; |
719fc62f | 1306 | int newsock, nextstate; |
7368a6c8 | 1307 | socklen_t addrlen; |
0490e609 | 1308 | char *rtype; |
fa08c86b | 1309 | |
7368a6c8 | 1310 | if (FD_ISSET(c->sock, readset)) { |
1311 | debug("Connection to port %d forwarding " | |
1312 | "to %.100s port %d requested.", | |
1313 | c->listening_port, c->path, c->host_port); | |
0490e609 | 1314 | |
639cb8ab | 1315 | if (c->type == SSH_CHANNEL_RPORT_LISTENER) { |
1316 | nextstate = SSH_CHANNEL_OPENING; | |
1317 | rtype = "forwarded-tcpip"; | |
1318 | } else { | |
1319 | if (c->host_port == 0) { | |
1320 | nextstate = SSH_CHANNEL_DYNAMIC; | |
f3964cb9 | 1321 | rtype = "dynamic-tcpip"; |
639cb8ab | 1322 | } else { |
1323 | nextstate = SSH_CHANNEL_OPENING; | |
1324 | rtype = "direct-tcpip"; | |
1325 | } | |
1326 | } | |
0490e609 | 1327 | |
7368a6c8 | 1328 | addrlen = sizeof(addr); |
1329 | newsock = accept(c->sock, &addr, &addrlen); | |
1330 | if (newsock < 0) { | |
1331 | error("accept: %.100s", strerror(errno)); | |
1332 | return; | |
1333 | } | |
811a6342 | 1334 | set_nodelay(newsock); |
0d942eff | 1335 | nc = channel_new(rtype, nextstate, newsock, newsock, -1, |
1336 | c->local_window_max, c->local_maxpacket, 0, rtype, 1); | |
0490e609 | 1337 | nc->listening_port = c->listening_port; |
1338 | nc->host_port = c->host_port; | |
1339 | strlcpy(nc->path, c->path, sizeof(nc->path)); | |
1340 | ||
639cb8ab | 1341 | if (nextstate == SSH_CHANNEL_DYNAMIC) { |
1342 | /* | |
1343 | * do not call the channel_post handler until | |
1344 | * this flag has been reset by a pre-handler. | |
1345 | * otherwise the FD_ISSET calls might overflow | |
1346 | */ | |
1347 | nc->delayed = 1; | |
1348 | } else { | |
0490e609 | 1349 | port_open_helper(nc, rtype); |
639cb8ab | 1350 | } |
7368a6c8 | 1351 | } |
1352 | } | |
8efc0c15 | 1353 | |
7368a6c8 | 1354 | /* |
1355 | * This is the authentication agent socket listening for connections from | |
1356 | * clients. | |
1357 | */ | |
ebb90778 | 1358 | /* ARGSUSED */ |
396c147e | 1359 | static void |
c8e9c167 | 1360 | channel_post_auth_listener(Channel *c, fd_set *readset, fd_set *writeset) |
8efc0c15 | 1361 | { |
719fc62f | 1362 | Channel *nc; |
1363 | int newsock; | |
5260325f | 1364 | struct sockaddr addr; |
48e671d5 | 1365 | socklen_t addrlen; |
5260325f | 1366 | |
7368a6c8 | 1367 | if (FD_ISSET(c->sock, readset)) { |
1368 | addrlen = sizeof(addr); | |
1369 | newsock = accept(c->sock, &addr, &addrlen); | |
1370 | if (newsock < 0) { | |
1371 | error("accept from auth socket: %.100s", strerror(errno)); | |
1372 | return; | |
1373 | } | |
719fc62f | 1374 | nc = channel_new("accepted auth socket", |
fa08c86b | 1375 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
1376 | c->local_window_max, c->local_maxpacket, | |
0d942eff | 1377 | 0, "accepted auth socket", 1); |
fa08c86b | 1378 | if (compat20) { |
1379 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1380 | packet_put_cstring("auth-agent@openssh.com"); | |
719fc62f | 1381 | packet_put_int(nc->self); |
fa08c86b | 1382 | packet_put_int(c->local_window_max); |
1383 | packet_put_int(c->local_maxpacket); | |
1384 | } else { | |
1385 | packet_start(SSH_SMSG_AGENT_OPEN); | |
719fc62f | 1386 | packet_put_int(nc->self); |
fa08c86b | 1387 | } |
7368a6c8 | 1388 | packet_send(); |
1389 | } | |
1390 | } | |
5260325f | 1391 | |
ebb90778 | 1392 | /* ARGSUSED */ |
396c147e | 1393 | static void |
c8e9c167 | 1394 | channel_post_connecting(Channel *c, fd_set *readset, fd_set *writeset) |
97fb6912 | 1395 | { |
d18e0850 | 1396 | int err = 0; |
8ab2cb35 | 1397 | socklen_t sz = sizeof(err); |
d18e0850 | 1398 | |
97fb6912 | 1399 | if (FD_ISSET(c->sock, writeset)) { |
db518d9b | 1400 | if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, &err, &sz) < 0) { |
d18e0850 | 1401 | err = errno; |
1402 | error("getsockopt SO_ERROR failed"); | |
1403 | } | |
1404 | if (err == 0) { | |
1405 | debug("channel %d: connected", c->self); | |
1406 | c->type = SSH_CHANNEL_OPEN; | |
1407 | if (compat20) { | |
1408 | packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1409 | packet_put_int(c->remote_id); | |
1410 | packet_put_int(c->self); | |
1411 | packet_put_int(c->local_window); | |
1412 | packet_put_int(c->local_maxpacket); | |
1413 | } else { | |
1414 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1415 | packet_put_int(c->remote_id); | |
1416 | packet_put_int(c->self); | |
1417 | } | |
97fb6912 | 1418 | } else { |
d18e0850 | 1419 | debug("channel %d: not connected: %s", |
1420 | c->self, strerror(err)); | |
1421 | if (compat20) { | |
1422 | packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); | |
1423 | packet_put_int(c->remote_id); | |
1424 | packet_put_int(SSH2_OPEN_CONNECT_FAILED); | |
1425 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { | |
1426 | packet_put_cstring(strerror(err)); | |
1427 | packet_put_cstring(""); | |
1428 | } | |
97fb6912 | 1429 | } else { |
d18e0850 | 1430 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
1431 | packet_put_int(c->remote_id); | |
97fb6912 | 1432 | } |
d18e0850 | 1433 | chan_mark_dead(c); |
97fb6912 | 1434 | } |
d18e0850 | 1435 | packet_send(); |
97fb6912 | 1436 | } |
1437 | } | |
1438 | ||
ebb90778 | 1439 | /* ARGSUSED */ |
396c147e | 1440 | static int |
c8e9c167 | 1441 | channel_handle_rfd(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1442 | { |
fa1d7d85 | 1443 | char buf[CHAN_RBUF]; |
7368a6c8 | 1444 | int len; |
1445 | ||
6fd8622b | 1446 | if (c->rfd != -1 && |
7368a6c8 | 1447 | FD_ISSET(c->rfd, readset)) { |
ea8c44d9 | 1448 | errno = 0; |
7368a6c8 | 1449 | len = read(c->rfd, buf, sizeof(buf)); |
0fbe8c74 | 1450 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
1451 | return 1; | |
ea8c44d9 | 1452 | #ifndef PTY_ZEROREAD |
7368a6c8 | 1453 | if (len <= 0) { |
ea8c44d9 | 1454 | #else |
9c04d67d | 1455 | if ((!c->isatty && len <= 0) || |
1456 | (c->isatty && (len < 0 || (len == 0 && errno != 0)))) { | |
ea8c44d9 | 1457 | #endif |
d7ac5f18 | 1458 | debug2("channel %d: read<=0 rfd %d len %d", |
7368a6c8 | 1459 | c->self, c->rfd, len); |
28b9cb4d | 1460 | if (c->type != SSH_CHANNEL_OPEN) { |
d7ac5f18 | 1461 | debug2("channel %d: not open", c->self); |
719fc62f | 1462 | chan_mark_dead(c); |
0490e609 | 1463 | return -1; |
28b9cb4d | 1464 | } else if (compat13) { |
9c50edcf | 1465 | buffer_clear(&c->output); |
7368a6c8 | 1466 | c->type = SSH_CHANNEL_INPUT_DRAINING; |
d7ac5f18 | 1467 | debug2("channel %d: input draining.", c->self); |
7368a6c8 | 1468 | } else { |
1469 | chan_read_failed(c); | |
5260325f | 1470 | } |
7368a6c8 | 1471 | return -1; |
1472 | } | |
6aacefa7 | 1473 | if (c->input_filter != NULL) { |
2e73a022 | 1474 | if (c->input_filter(c, buf, len) == -1) { |
d7ac5f18 | 1475 | debug2("channel %d: filter stops", c->self); |
2e73a022 | 1476 | chan_read_failed(c); |
1477 | } | |
d20f3c9e | 1478 | } else if (c->datagram) { |
1479 | buffer_put_string(&c->input, buf, len); | |
2e73a022 | 1480 | } else { |
1481 | buffer_append(&c->input, buf, len); | |
1482 | } | |
7368a6c8 | 1483 | } |
1484 | return 1; | |
1485 | } | |
a7137f6b | 1486 | |
ebb90778 | 1487 | /* ARGSUSED */ |
396c147e | 1488 | static int |
c8e9c167 | 1489 | channel_handle_wfd(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1490 | { |
95ce5599 | 1491 | struct termios tio; |
c1c6a032 | 1492 | u_char *data = NULL, *buf; |
780a9951 | 1493 | u_int dlen; |
7368a6c8 | 1494 | int len; |
1495 | ||
1496 | /* Send buffered output data to the socket. */ | |
6fd8622b | 1497 | if (c->wfd != -1 && |
7368a6c8 | 1498 | FD_ISSET(c->wfd, writeset) && |
1499 | buffer_len(&c->output) > 0) { | |
c1c6a032 | 1500 | if (c->output_filter != NULL) { |
1501 | if ((buf = c->output_filter(c, &data, &dlen)) == NULL) { | |
1502 | debug2("channel %d: filter stops", c->self); | |
d7b37427 | 1503 | if (c->type != SSH_CHANNEL_OPEN) |
1504 | chan_mark_dead(c); | |
1505 | else | |
1506 | chan_write_failed(c); | |
1507 | return -1; | |
c1c6a032 | 1508 | } |
1509 | } else if (c->datagram) { | |
1510 | buf = data = buffer_get_string(&c->output, &dlen); | |
1511 | } else { | |
1512 | buf = data = buffer_ptr(&c->output); | |
1513 | dlen = buffer_len(&c->output); | |
1514 | } | |
1515 | ||
d20f3c9e | 1516 | if (c->datagram) { |
d20f3c9e | 1517 | /* ignore truncated writes, datagrams might get lost */ |
1518 | c->local_consumed += dlen + 4; | |
c1c6a032 | 1519 | len = write(c->wfd, buf, dlen); |
d20f3c9e | 1520 | xfree(data); |
1521 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) | |
1522 | return 1; | |
1523 | if (len <= 0) { | |
1524 | if (c->type != SSH_CHANNEL_OPEN) | |
1525 | chan_mark_dead(c); | |
1526 | else | |
1527 | chan_write_failed(c); | |
1528 | return -1; | |
1529 | } | |
1530 | return 1; | |
1531 | } | |
64c0ce80 | 1532 | #ifdef _AIX |
aff51935 | 1533 | /* XXX: Later AIX versions can't push as much data to tty */ |
7fbb4189 | 1534 | if (compat20 && c->wfd_isatty) |
1535 | dlen = MIN(dlen, 8*1024); | |
64c0ce80 | 1536 | #endif |
c1c6a032 | 1537 | |
1538 | len = write(c->wfd, buf, dlen); | |
0fbe8c74 | 1539 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
1540 | return 1; | |
7368a6c8 | 1541 | if (len <= 0) { |
28b9cb4d | 1542 | if (c->type != SSH_CHANNEL_OPEN) { |
d7ac5f18 | 1543 | debug2("channel %d: not open", c->self); |
719fc62f | 1544 | chan_mark_dead(c); |
28b9cb4d | 1545 | return -1; |
1546 | } else if (compat13) { | |
9c50edcf | 1547 | buffer_clear(&c->output); |
d7ac5f18 | 1548 | debug2("channel %d: input draining.", c->self); |
7368a6c8 | 1549 | c->type = SSH_CHANNEL_INPUT_DRAINING; |
1550 | } else { | |
1551 | chan_write_failed(c); | |
5260325f | 1552 | } |
7368a6c8 | 1553 | return -1; |
1554 | } | |
c1c6a032 | 1555 | if (compat20 && c->isatty && dlen >= 1 && buf[0] != '\r') { |
0ae4fe1d | 1556 | if (tcgetattr(c->wfd, &tio) == 0 && |
1557 | !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) { | |
1558 | /* | |
1559 | * Simulate echo to reduce the impact of | |
355724fc | 1560 | * traffic analysis. We need to match the |
95ce5599 | 1561 | * size of a SSH2_MSG_CHANNEL_DATA message |
c1c6a032 | 1562 | * (4 byte channel id + buf) |
0ae4fe1d | 1563 | */ |
95ce5599 | 1564 | packet_send_ignore(4 + len); |
0ae4fe1d | 1565 | packet_send(); |
0ae4fe1d | 1566 | } |
1567 | } | |
7368a6c8 | 1568 | buffer_consume(&c->output, len); |
7e7327a1 | 1569 | if (compat20 && len > 0) { |
1570 | c->local_consumed += len; | |
1571 | } | |
1572 | } | |
1573 | return 1; | |
1574 | } | |
a7137f6b | 1575 | |
396c147e | 1576 | static int |
c8e9c167 | 1577 | channel_handle_efd(Channel *c, fd_set *readset, fd_set *writeset) |
7e7327a1 | 1578 | { |
fa1d7d85 | 1579 | char buf[CHAN_RBUF]; |
7e7327a1 | 1580 | int len; |
1581 | ||
8ce64345 | 1582 | /** XXX handle drain efd, too */ |
7e7327a1 | 1583 | if (c->efd != -1) { |
1584 | if (c->extended_usage == CHAN_EXTENDED_WRITE && | |
1585 | FD_ISSET(c->efd, writeset) && | |
1586 | buffer_len(&c->extended) > 0) { | |
1587 | len = write(c->efd, buffer_ptr(&c->extended), | |
1588 | buffer_len(&c->extended)); | |
de273eef | 1589 | debug2("channel %d: written %d to efd %d", |
7e7327a1 | 1590 | c->self, len, c->efd); |
ee55dacf | 1591 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
1592 | return 1; | |
1593 | if (len <= 0) { | |
1594 | debug2("channel %d: closing write-efd %d", | |
1595 | c->self, c->efd); | |
489aa2e9 | 1596 | channel_close_fd(&c->efd); |
ee55dacf | 1597 | } else { |
7e7327a1 | 1598 | buffer_consume(&c->extended, len); |
1599 | c->local_consumed += len; | |
1600 | } | |
1601 | } else if (c->extended_usage == CHAN_EXTENDED_READ && | |
1602 | FD_ISSET(c->efd, readset)) { | |
1603 | len = read(c->efd, buf, sizeof(buf)); | |
de273eef | 1604 | debug2("channel %d: read %d from efd %d", |
184eed6a | 1605 | c->self, len, c->efd); |
ee55dacf | 1606 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
1607 | return 1; | |
1608 | if (len <= 0) { | |
1609 | debug2("channel %d: closing read-efd %d", | |
8ce64345 | 1610 | c->self, c->efd); |
489aa2e9 | 1611 | channel_close_fd(&c->efd); |
ee55dacf | 1612 | } else { |
7e7327a1 | 1613 | buffer_append(&c->extended, buf, len); |
ee55dacf | 1614 | } |
7e7327a1 | 1615 | } |
1616 | } | |
1617 | return 1; | |
1618 | } | |
a7137f6b | 1619 | |
ebb90778 | 1620 | /* ARGSUSED */ |
396c147e | 1621 | static int |
c8e9c167 | 1622 | channel_handle_ctl(Channel *c, fd_set *readset, fd_set *writeset) |
5e96b616 | 1623 | { |
1624 | char buf[16]; | |
1625 | int len; | |
1626 | ||
1627 | /* Monitor control fd to detect if the slave client exits */ | |
1628 | if (c->ctl_fd != -1 && FD_ISSET(c->ctl_fd, readset)) { | |
1629 | len = read(c->ctl_fd, buf, sizeof(buf)); | |
1630 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) | |
1631 | return 1; | |
1632 | if (len <= 0) { | |
1633 | debug2("channel %d: ctl read<=0", c->self); | |
1634 | if (c->type != SSH_CHANNEL_OPEN) { | |
1635 | debug2("channel %d: not open", c->self); | |
1636 | chan_mark_dead(c); | |
1637 | return -1; | |
1638 | } else { | |
1639 | chan_read_failed(c); | |
1640 | chan_write_failed(c); | |
1641 | } | |
1642 | return -1; | |
1643 | } else | |
1644 | fatal("%s: unexpected data on ctl fd", __func__); | |
1645 | } | |
1646 | return 1; | |
1647 | } | |
a7137f6b | 1648 | |
5e96b616 | 1649 | static int |
ee55dacf | 1650 | channel_check_window(Channel *c) |
7e7327a1 | 1651 | { |
28b9cb4d | 1652 | if (c->type == SSH_CHANNEL_OPEN && |
1653 | !(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) && | |
7e7327a1 | 1654 | c->local_window < c->local_window_max/2 && |
1655 | c->local_consumed > 0) { | |
1656 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); | |
1657 | packet_put_int(c->remote_id); | |
1658 | packet_put_int(c->local_consumed); | |
1659 | packet_send(); | |
de273eef | 1660 | debug2("channel %d: window %d sent adjust %d", |
7e7327a1 | 1661 | c->self, c->local_window, |
1662 | c->local_consumed); | |
1663 | c->local_window += c->local_consumed; | |
1664 | c->local_consumed = 0; | |
7368a6c8 | 1665 | } |
1666 | return 1; | |
1667 | } | |
5260325f | 1668 | |
396c147e | 1669 | static void |
c8e9c167 | 1670 | channel_post_open(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1671 | { |
639cb8ab | 1672 | if (c->delayed) |
1673 | return; | |
7368a6c8 | 1674 | channel_handle_rfd(c, readset, writeset); |
1675 | channel_handle_wfd(c, readset, writeset); | |
0c0738d5 | 1676 | if (!compat20) |
639cb8ab | 1677 | return; |
7e7327a1 | 1678 | channel_handle_efd(c, readset, writeset); |
5e96b616 | 1679 | channel_handle_ctl(c, readset, writeset); |
ee55dacf | 1680 | channel_check_window(c); |
7e7327a1 | 1681 | } |
1682 | ||
ebb90778 | 1683 | /* ARGSUSED */ |
396c147e | 1684 | static void |
c8e9c167 | 1685 | channel_post_output_drain_13(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1686 | { |
1687 | int len; | |
e1feb9bf | 1688 | |
7368a6c8 | 1689 | /* Send buffered output data to the socket. */ |
1690 | if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) { | |
1691 | len = write(c->sock, buffer_ptr(&c->output), | |
1692 | buffer_len(&c->output)); | |
1693 | if (len <= 0) | |
9c50edcf | 1694 | buffer_clear(&c->output); |
7368a6c8 | 1695 | else |
1696 | buffer_consume(&c->output, len); | |
1697 | } | |
1698 | } | |
5260325f | 1699 | |
396c147e | 1700 | static void |
7e7327a1 | 1701 | channel_handler_init_20(void) |
1702 | { | |
0c0738d5 | 1703 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open; |
0b242b12 | 1704 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
7e7327a1 | 1705 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; |
fa08c86b | 1706 | channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener; |
0b242b12 | 1707 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
fa08c86b | 1708 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; |
97fb6912 | 1709 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1710 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7e7327a1 | 1711 | |
0c0738d5 | 1712 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
7e7327a1 | 1713 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; |
fa08c86b | 1714 | channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener; |
0b242b12 | 1715 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
fa08c86b | 1716 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; |
97fb6912 | 1717 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 1718 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
7e7327a1 | 1719 | } |
1720 | ||
396c147e | 1721 | static void |
7368a6c8 | 1722 | channel_handler_init_13(void) |
1723 | { | |
1724 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13; | |
1725 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_13; | |
1726 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; | |
1727 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; | |
1728 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; | |
1729 | channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining; | |
1730 | channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining; | |
97fb6912 | 1731 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1732 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7368a6c8 | 1733 | |
0c0738d5 | 1734 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
7368a6c8 | 1735 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
1736 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; | |
1737 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; | |
1738 | channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13; | |
97fb6912 | 1739 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 1740 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
7368a6c8 | 1741 | } |
5260325f | 1742 | |
396c147e | 1743 | static void |
7368a6c8 | 1744 | channel_handler_init_15(void) |
1745 | { | |
0c0738d5 | 1746 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open; |
0b242b12 | 1747 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
7368a6c8 | 1748 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
1749 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; | |
1750 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; | |
97fb6912 | 1751 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1752 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7368a6c8 | 1753 | |
1754 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; | |
1755 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; | |
1756 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; | |
0c0738d5 | 1757 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
97fb6912 | 1758 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 1759 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
7368a6c8 | 1760 | } |
1761 | ||
396c147e | 1762 | static void |
7368a6c8 | 1763 | channel_handler_init(void) |
1764 | { | |
1765 | int i; | |
e1feb9bf | 1766 | |
184eed6a | 1767 | for (i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) { |
7368a6c8 | 1768 | channel_pre[i] = NULL; |
1769 | channel_post[i] = NULL; | |
1770 | } | |
7e7327a1 | 1771 | if (compat20) |
1772 | channel_handler_init_20(); | |
1773 | else if (compat13) | |
7368a6c8 | 1774 | channel_handler_init_13(); |
1775 | else | |
1776 | channel_handler_init_15(); | |
1777 | } | |
1778 | ||
418e724c | 1779 | /* gc dead channels */ |
1780 | static void | |
1781 | channel_garbage_collect(Channel *c) | |
1782 | { | |
1783 | if (c == NULL) | |
1784 | return; | |
1785 | if (c->detach_user != NULL) { | |
8cd0437d | 1786 | if (!chan_is_dead(c, c->detach_close)) |
418e724c | 1787 | return; |
d7ac5f18 | 1788 | debug2("channel %d: gc: notify user", c->self); |
418e724c | 1789 | c->detach_user(c->self, NULL); |
1790 | /* if we still have a callback */ | |
1791 | if (c->detach_user != NULL) | |
1792 | return; | |
d7ac5f18 | 1793 | debug2("channel %d: gc: user detached", c->self); |
418e724c | 1794 | } |
1795 | if (!chan_is_dead(c, 1)) | |
1796 | return; | |
d7ac5f18 | 1797 | debug2("channel %d: garbage collecting", c->self); |
418e724c | 1798 | channel_free(c); |
1799 | } | |
1800 | ||
396c147e | 1801 | static void |
c8e9c167 | 1802 | channel_handler(chan_fn *ftab[], fd_set *readset, fd_set *writeset) |
7368a6c8 | 1803 | { |
1804 | static int did_init = 0; | |
9a995072 | 1805 | u_int i; |
7368a6c8 | 1806 | Channel *c; |
1807 | ||
1808 | if (!did_init) { | |
1809 | channel_handler_init(); | |
1810 | did_init = 1; | |
1811 | } | |
1812 | for (i = 0; i < channels_alloc; i++) { | |
719fc62f | 1813 | c = channels[i]; |
1814 | if (c == NULL) | |
5260325f | 1815 | continue; |
6fd8622b | 1816 | if (ftab[c->type] != NULL) |
1817 | (*ftab[c->type])(c, readset, writeset); | |
418e724c | 1818 | channel_garbage_collect(c); |
8efc0c15 | 1819 | } |
8efc0c15 | 1820 | } |
1821 | ||
8e7895b8 | 1822 | /* |
1823 | * Allocate/update select bitmasks and add any bits relevant to channels in | |
1824 | * select bitmasks. | |
1825 | */ | |
6ae2364d | 1826 | void |
c422989b | 1827 | channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp, |
9a995072 | 1828 | u_int *nallocp, int rekeying) |
7368a6c8 | 1829 | { |
c5d10563 | 1830 | u_int n, sz, nfdset; |
39929cdb | 1831 | |
1832 | n = MAX(*maxfdp, channel_max_fd); | |
1833 | ||
c5d10563 | 1834 | nfdset = howmany(n+1, NFDBITS); |
1835 | /* Explicitly test here, because xrealloc isn't always called */ | |
1836 | if (nfdset && SIZE_T_MAX / nfdset < sizeof(fd_mask)) | |
1837 | fatal("channel_prepare_select: max_fd (%d) is too large", n); | |
1838 | sz = nfdset * sizeof(fd_mask); | |
1839 | ||
489aa2e9 | 1840 | /* perhaps check sz < nalloc/2 and shrink? */ |
1841 | if (*readsetp == NULL || sz > *nallocp) { | |
c5d10563 | 1842 | *readsetp = xrealloc(*readsetp, nfdset, sizeof(fd_mask)); |
1843 | *writesetp = xrealloc(*writesetp, nfdset, sizeof(fd_mask)); | |
489aa2e9 | 1844 | *nallocp = sz; |
39929cdb | 1845 | } |
489aa2e9 | 1846 | *maxfdp = n; |
39929cdb | 1847 | memset(*readsetp, 0, sz); |
1848 | memset(*writesetp, 0, sz); | |
1849 | ||
c422989b | 1850 | if (!rekeying) |
1851 | channel_handler(channel_pre, *readsetp, *writesetp); | |
7368a6c8 | 1852 | } |
1853 | ||
8e7895b8 | 1854 | /* |
1855 | * After select, perform any appropriate operations for channels which have | |
1856 | * events pending. | |
1857 | */ | |
6ae2364d | 1858 | void |
c8e9c167 | 1859 | channel_after_select(fd_set *readset, fd_set *writeset) |
7368a6c8 | 1860 | { |
1861 | channel_handler(channel_post, readset, writeset); | |
1862 | } | |
1863 | ||
8e7895b8 | 1864 | |
39929cdb | 1865 | /* If there is data to send to the connection, enqueue some of it now. */ |
6ae2364d | 1866 | void |
d5bb9418 | 1867 | channel_output_poll(void) |
8efc0c15 | 1868 | { |
7368a6c8 | 1869 | Channel *c; |
9a995072 | 1870 | u_int i, len; |
5260325f | 1871 | |
1872 | for (i = 0; i < channels_alloc; i++) { | |
719fc62f | 1873 | c = channels[i]; |
1874 | if (c == NULL) | |
1875 | continue; | |
48e671d5 | 1876 | |
8e7895b8 | 1877 | /* |
1878 | * We are only interested in channels that can have buffered | |
1879 | * incoming data. | |
1880 | */ | |
48e671d5 | 1881 | if (compat13) { |
7368a6c8 | 1882 | if (c->type != SSH_CHANNEL_OPEN && |
1883 | c->type != SSH_CHANNEL_INPUT_DRAINING) | |
48e671d5 | 1884 | continue; |
1885 | } else { | |
7368a6c8 | 1886 | if (c->type != SSH_CHANNEL_OPEN) |
48e671d5 | 1887 | continue; |
48e671d5 | 1888 | } |
e78a59f5 | 1889 | if (compat20 && |
1890 | (c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) { | |
ee55dacf | 1891 | /* XXX is this true? */ |
418e724c | 1892 | debug3("channel %d: will not send data after close", c->self); |
7e7327a1 | 1893 | continue; |
1894 | } | |
5260325f | 1895 | |
1896 | /* Get the amount of buffered data for this channel. */ | |
ee55dacf | 1897 | if ((c->istate == CHAN_INPUT_OPEN || |
1898 | c->istate == CHAN_INPUT_WAIT_DRAIN) && | |
1899 | (len = buffer_len(&c->input)) > 0) { | |
d20f3c9e | 1900 | if (c->datagram) { |
1901 | if (len > 0) { | |
1902 | u_char *data; | |
1903 | u_int dlen; | |
1904 | ||
1905 | data = buffer_get_string(&c->input, | |
1906 | &dlen); | |
1907 | packet_start(SSH2_MSG_CHANNEL_DATA); | |
1908 | packet_put_int(c->remote_id); | |
1909 | packet_put_string(data, dlen); | |
1910 | packet_send(); | |
1911 | c->remote_window -= dlen + 4; | |
1912 | xfree(data); | |
1913 | } | |
1914 | continue; | |
1915 | } | |
8e7895b8 | 1916 | /* |
1917 | * Send some data for the other side over the secure | |
1918 | * connection. | |
1919 | */ | |
7e7327a1 | 1920 | if (compat20) { |
1921 | if (len > c->remote_window) | |
1922 | len = c->remote_window; | |
1923 | if (len > c->remote_maxpacket) | |
1924 | len = c->remote_maxpacket; | |
5260325f | 1925 | } else { |
7e7327a1 | 1926 | if (packet_is_interactive()) { |
1927 | if (len > 1024) | |
1928 | len = 512; | |
1929 | } else { | |
1930 | /* Keep the packets at reasonable size. */ | |
1931 | if (len > packet_get_maxsize()/2) | |
1932 | len = packet_get_maxsize()/2; | |
1933 | } | |
5260325f | 1934 | } |
7368a6c8 | 1935 | if (len > 0) { |
7e7327a1 | 1936 | packet_start(compat20 ? |
1937 | SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA); | |
7368a6c8 | 1938 | packet_put_int(c->remote_id); |
1939 | packet_put_string(buffer_ptr(&c->input), len); | |
1940 | packet_send(); | |
1941 | buffer_consume(&c->input, len); | |
1942 | c->remote_window -= len; | |
7368a6c8 | 1943 | } |
1944 | } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) { | |
5260325f | 1945 | if (compat13) |
1946 | fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3"); | |
aa3378df | 1947 | /* |
1948 | * input-buffer is empty and read-socket shutdown: | |
d2296ed7 | 1949 | * tell peer, that we will not send more data: send IEOF. |
1950 | * hack for extended data: delay EOF if EFD still in use. | |
aa3378df | 1951 | */ |
d2296ed7 | 1952 | if (CHANNEL_EFD_INPUT_ACTIVE(c)) |
4e2e5cfd | 1953 | debug2("channel %d: ibuf_empty delayed efd %d/(%d)", |
1954 | c->self, c->efd, buffer_len(&c->extended)); | |
d2296ed7 | 1955 | else |
1956 | chan_ibuf_empty(c); | |
5260325f | 1957 | } |
7e7327a1 | 1958 | /* Send extended data, i.e. stderr */ |
1959 | if (compat20 && | |
d2296ed7 | 1960 | !(c->flags & CHAN_EOF_SENT) && |
7e7327a1 | 1961 | c->remote_window > 0 && |
1962 | (len = buffer_len(&c->extended)) > 0 && | |
1963 | c->extended_usage == CHAN_EXTENDED_READ) { | |
f91d9a89 | 1964 | debug2("channel %d: rwin %u elen %u euse %d", |
ee55dacf | 1965 | c->self, c->remote_window, buffer_len(&c->extended), |
1966 | c->extended_usage); | |
7e7327a1 | 1967 | if (len > c->remote_window) |
1968 | len = c->remote_window; | |
1969 | if (len > c->remote_maxpacket) | |
1970 | len = c->remote_maxpacket; | |
1971 | packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA); | |
1972 | packet_put_int(c->remote_id); | |
1973 | packet_put_int(SSH2_EXTENDED_DATA_STDERR); | |
1974 | packet_put_string(buffer_ptr(&c->extended), len); | |
1975 | packet_send(); | |
1976 | buffer_consume(&c->extended, len); | |
1977 | c->remote_window -= len; | |
ee55dacf | 1978 | debug2("channel %d: sent ext data %d", c->self, len); |
7e7327a1 | 1979 | } |
8efc0c15 | 1980 | } |
8efc0c15 | 1981 | } |
1982 | ||
8e7895b8 | 1983 | |
1984 | /* -- protocol input */ | |
04aa9e67 | 1985 | |
1986 | /* ARGSUSED */ | |
6ae2364d | 1987 | void |
7819b5c3 | 1988 | channel_input_data(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 1989 | { |
48e671d5 | 1990 | int id; |
5260325f | 1991 | char *data; |
1e3b8b07 | 1992 | u_int data_len; |
7368a6c8 | 1993 | Channel *c; |
5260325f | 1994 | |
1995 | /* Get the channel number and verify it. */ | |
48e671d5 | 1996 | id = packet_get_int(); |
7368a6c8 | 1997 | c = channel_lookup(id); |
1998 | if (c == NULL) | |
48e671d5 | 1999 | packet_disconnect("Received data for nonexistent channel %d.", id); |
5260325f | 2000 | |
2001 | /* Ignore any data for non-open channels (might happen on close) */ | |
7368a6c8 | 2002 | if (c->type != SSH_CHANNEL_OPEN && |
2003 | c->type != SSH_CHANNEL_X11_OPEN) | |
48e671d5 | 2004 | return; |
2005 | ||
5260325f | 2006 | /* Get the data. */ |
2007 | data = packet_get_string(&data_len); | |
7368a6c8 | 2008 | |
7741e239 | 2009 | /* |
2010 | * Ignore data for protocol > 1.3 if output end is no longer open. | |
2011 | * For protocol 2 the sending side is reducing its window as it sends | |
2012 | * data, so we must 'fake' consumption of the data in order to ensure | |
2013 | * that window updates are sent back. Otherwise the connection might | |
2014 | * deadlock. | |
2015 | */ | |
2016 | if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN) { | |
2017 | if (compat20) { | |
2018 | c->local_window -= data_len; | |
2019 | c->local_consumed += data_len; | |
2020 | } | |
2021 | xfree(data); | |
2022 | return; | |
2023 | } | |
2024 | ||
6aacefa7 | 2025 | if (compat20) { |
7e7327a1 | 2026 | if (data_len > c->local_maxpacket) { |
bbe88b6d | 2027 | logit("channel %d: rcvd big packet %d, maxpack %d", |
7e7327a1 | 2028 | c->self, data_len, c->local_maxpacket); |
2029 | } | |
2030 | if (data_len > c->local_window) { | |
bbe88b6d | 2031 | logit("channel %d: rcvd too much data %d, win %d", |
7e7327a1 | 2032 | c->self, data_len, c->local_window); |
2033 | xfree(data); | |
2034 | return; | |
2035 | } | |
2036 | c->local_window -= data_len; | |
7e7327a1 | 2037 | } |
95500969 | 2038 | packet_check_eom(); |
d20f3c9e | 2039 | if (c->datagram) |
2040 | buffer_put_string(&c->output, data, data_len); | |
2041 | else | |
2042 | buffer_append(&c->output, data, data_len); | |
5260325f | 2043 | xfree(data); |
8efc0c15 | 2044 | } |
8e7895b8 | 2045 | |
04aa9e67 | 2046 | /* ARGSUSED */ |
6ae2364d | 2047 | void |
7819b5c3 | 2048 | channel_input_extended_data(int type, u_int32_t seq, void *ctxt) |
7e7327a1 | 2049 | { |
2050 | int id; | |
7e7327a1 | 2051 | char *data; |
a594fa74 | 2052 | u_int data_len, tcode; |
7e7327a1 | 2053 | Channel *c; |
2054 | ||
2055 | /* Get the channel number and verify it. */ | |
2056 | id = packet_get_int(); | |
2057 | c = channel_lookup(id); | |
2058 | ||
2059 | if (c == NULL) | |
2060 | packet_disconnect("Received extended_data for bad channel %d.", id); | |
2061 | if (c->type != SSH_CHANNEL_OPEN) { | |
bbe88b6d | 2062 | logit("channel %d: ext data for non open", id); |
7e7327a1 | 2063 | return; |
2064 | } | |
d2296ed7 | 2065 | if (c->flags & CHAN_EOF_RCVD) { |
2066 | if (datafellows & SSH_BUG_EXTEOF) | |
2067 | debug("channel %d: accepting ext data after eof", id); | |
2068 | else | |
2069 | packet_disconnect("Received extended_data after EOF " | |
2070 | "on channel %d.", id); | |
2071 | } | |
7e7327a1 | 2072 | tcode = packet_get_int(); |
2073 | if (c->efd == -1 || | |
2074 | c->extended_usage != CHAN_EXTENDED_WRITE || | |
2075 | tcode != SSH2_EXTENDED_DATA_STDERR) { | |
bbe88b6d | 2076 | logit("channel %d: bad ext data", c->self); |
7e7327a1 | 2077 | return; |
2078 | } | |
2079 | data = packet_get_string(&data_len); | |
95500969 | 2080 | packet_check_eom(); |
7e7327a1 | 2081 | if (data_len > c->local_window) { |
bbe88b6d | 2082 | logit("channel %d: rcvd too much extended_data %d, win %d", |
7e7327a1 | 2083 | c->self, data_len, c->local_window); |
2084 | xfree(data); | |
2085 | return; | |
2086 | } | |
de273eef | 2087 | debug2("channel %d: rcvd ext data %d", c->self, data_len); |
7e7327a1 | 2088 | c->local_window -= data_len; |
2089 | buffer_append(&c->extended, data, data_len); | |
2090 | xfree(data); | |
2091 | } | |
2092 | ||
04aa9e67 | 2093 | /* ARGSUSED */ |
6ae2364d | 2094 | void |
7819b5c3 | 2095 | channel_input_ieof(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 2096 | { |
2097 | int id; | |
2098 | Channel *c; | |
2099 | ||
7368a6c8 | 2100 | id = packet_get_int(); |
95500969 | 2101 | packet_check_eom(); |
7368a6c8 | 2102 | c = channel_lookup(id); |
2103 | if (c == NULL) | |
2104 | packet_disconnect("Received ieof for nonexistent channel %d.", id); | |
2105 | chan_rcvd_ieof(c); | |
a5f82435 | 2106 | |
2107 | /* XXX force input close */ | |
8341f420 | 2108 | if (c->force_drain && c->istate == CHAN_INPUT_OPEN) { |
a5f82435 | 2109 | debug("channel %d: FORCE input drain", c->self); |
2110 | c->istate = CHAN_INPUT_WAIT_DRAIN; | |
32e7d71f | 2111 | if (buffer_len(&c->input) == 0) |
2112 | chan_ibuf_empty(c); | |
a5f82435 | 2113 | } |
2114 | ||
7368a6c8 | 2115 | } |
8efc0c15 | 2116 | |
04aa9e67 | 2117 | /* ARGSUSED */ |
6ae2364d | 2118 | void |
7819b5c3 | 2119 | channel_input_close(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2120 | { |
7368a6c8 | 2121 | int id; |
2122 | Channel *c; | |
5260325f | 2123 | |
7368a6c8 | 2124 | id = packet_get_int(); |
95500969 | 2125 | packet_check_eom(); |
7368a6c8 | 2126 | c = channel_lookup(id); |
2127 | if (c == NULL) | |
2128 | packet_disconnect("Received close for nonexistent channel %d.", id); | |
aa3378df | 2129 | |
2130 | /* | |
2131 | * Send a confirmation that we have closed the channel and no more | |
2132 | * data is coming for it. | |
2133 | */ | |
5260325f | 2134 | packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION); |
7368a6c8 | 2135 | packet_put_int(c->remote_id); |
5260325f | 2136 | packet_send(); |
2137 | ||
aa3378df | 2138 | /* |
2139 | * If the channel is in closed state, we have sent a close request, | |
2140 | * and the other side will eventually respond with a confirmation. | |
2141 | * Thus, we cannot free the channel here, because then there would be | |
2142 | * no-one to receive the confirmation. The channel gets freed when | |
2143 | * the confirmation arrives. | |
2144 | */ | |
7368a6c8 | 2145 | if (c->type != SSH_CHANNEL_CLOSED) { |
aa3378df | 2146 | /* |
2147 | * Not a closed channel - mark it as draining, which will | |
2148 | * cause it to be freed later. | |
2149 | */ | |
9c50edcf | 2150 | buffer_clear(&c->input); |
7368a6c8 | 2151 | c->type = SSH_CHANNEL_OUTPUT_DRAINING; |
5260325f | 2152 | } |
8efc0c15 | 2153 | } |
2154 | ||
7368a6c8 | 2155 | /* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */ |
04aa9e67 | 2156 | /* ARGSUSED */ |
6ae2364d | 2157 | void |
7819b5c3 | 2158 | channel_input_oclose(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2159 | { |
7368a6c8 | 2160 | int id = packet_get_int(); |
2161 | Channel *c = channel_lookup(id); | |
a8a21a53 | 2162 | |
95500969 | 2163 | packet_check_eom(); |
7368a6c8 | 2164 | if (c == NULL) |
2165 | packet_disconnect("Received oclose for nonexistent channel %d.", id); | |
2166 | chan_rcvd_oclose(c); | |
8efc0c15 | 2167 | } |
2168 | ||
04aa9e67 | 2169 | /* ARGSUSED */ |
6ae2364d | 2170 | void |
7819b5c3 | 2171 | channel_input_close_confirmation(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 2172 | { |
2173 | int id = packet_get_int(); | |
2174 | Channel *c = channel_lookup(id); | |
2175 | ||
95500969 | 2176 | packet_check_eom(); |
7368a6c8 | 2177 | if (c == NULL) |
2178 | packet_disconnect("Received close confirmation for " | |
2179 | "out-of-range channel %d.", id); | |
2180 | if (c->type != SSH_CHANNEL_CLOSED) | |
2181 | packet_disconnect("Received close confirmation for " | |
2182 | "non-closed channel %d (type %d).", id, c->type); | |
719fc62f | 2183 | channel_free(c); |
7368a6c8 | 2184 | } |
8efc0c15 | 2185 | |
04aa9e67 | 2186 | /* ARGSUSED */ |
6ae2364d | 2187 | void |
7819b5c3 | 2188 | channel_input_open_confirmation(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2189 | { |
7368a6c8 | 2190 | int id, remote_id; |
2191 | Channel *c; | |
5260325f | 2192 | |
7368a6c8 | 2193 | id = packet_get_int(); |
2194 | c = channel_lookup(id); | |
5260325f | 2195 | |
7368a6c8 | 2196 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) |
2197 | packet_disconnect("Received open confirmation for " | |
2198 | "non-opening channel %d.", id); | |
2199 | remote_id = packet_get_int(); | |
aa3378df | 2200 | /* Record the remote channel number and mark that the channel is now open. */ |
7368a6c8 | 2201 | c->remote_id = remote_id; |
2202 | c->type = SSH_CHANNEL_OPEN; | |
7e7327a1 | 2203 | |
2204 | if (compat20) { | |
2205 | c->remote_window = packet_get_int(); | |
2206 | c->remote_maxpacket = packet_get_int(); | |
05ca0898 | 2207 | if (c->confirm) { |
de273eef | 2208 | debug2("callback start"); |
5e96b616 | 2209 | c->confirm(c->self, c->confirm_ctx); |
de273eef | 2210 | debug2("callback done"); |
7e7327a1 | 2211 | } |
d7ac5f18 | 2212 | debug2("channel %d: open confirm rwindow %u rmax %u", c->self, |
7e7327a1 | 2213 | c->remote_window, c->remote_maxpacket); |
2214 | } | |
95500969 | 2215 | packet_check_eom(); |
8efc0c15 | 2216 | } |
2217 | ||
396c147e | 2218 | static char * |
d18e0850 | 2219 | reason2txt(int reason) |
2220 | { | |
6aacefa7 | 2221 | switch (reason) { |
d18e0850 | 2222 | case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED: |
2223 | return "administratively prohibited"; | |
2224 | case SSH2_OPEN_CONNECT_FAILED: | |
2225 | return "connect failed"; | |
2226 | case SSH2_OPEN_UNKNOWN_CHANNEL_TYPE: | |
2227 | return "unknown channel type"; | |
2228 | case SSH2_OPEN_RESOURCE_SHORTAGE: | |
2229 | return "resource shortage"; | |
2230 | } | |
7e8c18e9 | 2231 | return "unknown reason"; |
d18e0850 | 2232 | } |
2233 | ||
04aa9e67 | 2234 | /* ARGSUSED */ |
6ae2364d | 2235 | void |
7819b5c3 | 2236 | channel_input_open_failure(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2237 | { |
02a024dd | 2238 | int id, reason; |
2239 | char *msg = NULL, *lang = NULL; | |
7368a6c8 | 2240 | Channel *c; |
5260325f | 2241 | |
7368a6c8 | 2242 | id = packet_get_int(); |
2243 | c = channel_lookup(id); | |
2244 | ||
2245 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) | |
2246 | packet_disconnect("Received open failure for " | |
2247 | "non-opening channel %d.", id); | |
7e7327a1 | 2248 | if (compat20) { |
02a024dd | 2249 | reason = packet_get_int(); |
fbe90f7b | 2250 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { |
02a024dd | 2251 | msg = packet_get_string(NULL); |
2252 | lang = packet_get_string(NULL); | |
2253 | } | |
bbe88b6d | 2254 | logit("channel %d: open failed: %s%s%s", id, |
d18e0850 | 2255 | reason2txt(reason), msg ? ": ": "", msg ? msg : ""); |
02a024dd | 2256 | if (msg != NULL) |
2257 | xfree(msg); | |
2258 | if (lang != NULL) | |
2259 | xfree(lang); | |
7e7327a1 | 2260 | } |
95500969 | 2261 | packet_check_eom(); |
5260325f | 2262 | /* Free the channel. This will also close the socket. */ |
719fc62f | 2263 | channel_free(c); |
8efc0c15 | 2264 | } |
2265 | ||
04aa9e67 | 2266 | /* ARGSUSED */ |
8e7895b8 | 2267 | void |
7819b5c3 | 2268 | channel_input_window_adjust(int type, u_int32_t seq, void *ctxt) |
8e7895b8 | 2269 | { |
2270 | Channel *c; | |
f91d9a89 | 2271 | int id; |
2272 | u_int adjust; | |
3ffc6336 | 2273 | |
8e7895b8 | 2274 | if (!compat20) |
2275 | return; | |
8efc0c15 | 2276 | |
8e7895b8 | 2277 | /* Get the channel number and verify it. */ |
2278 | id = packet_get_int(); | |
2279 | c = channel_lookup(id); | |
2280 | ||
b872f7f0 | 2281 | if (c == NULL) { |
2282 | logit("Received window adjust for non-open channel %d.", id); | |
8e7895b8 | 2283 | return; |
2284 | } | |
2285 | adjust = packet_get_int(); | |
95500969 | 2286 | packet_check_eom(); |
f91d9a89 | 2287 | debug2("channel %d: rcvd adjust %u", id, adjust); |
8e7895b8 | 2288 | c->remote_window += adjust; |
2289 | } | |
2290 | ||
04aa9e67 | 2291 | /* ARGSUSED */ |
8e7895b8 | 2292 | void |
7819b5c3 | 2293 | channel_input_port_open(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2294 | { |
8e7895b8 | 2295 | Channel *c = NULL; |
2296 | u_short host_port; | |
2297 | char *host, *originator_string; | |
2298 | int remote_id, sock = -1; | |
5260325f | 2299 | |
8e7895b8 | 2300 | remote_id = packet_get_int(); |
2301 | host = packet_get_string(NULL); | |
2302 | host_port = packet_get_int(); | |
2303 | ||
2304 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) { | |
2305 | originator_string = packet_get_string(NULL); | |
2306 | } else { | |
2307 | originator_string = xstrdup("unknown (remote did not supply name)"); | |
2308 | } | |
95500969 | 2309 | packet_check_eom(); |
8e7895b8 | 2310 | sock = channel_connect_to(host, host_port); |
2311 | if (sock != -1) { | |
2312 | c = channel_new("connected socket", | |
2313 | SSH_CHANNEL_CONNECTING, sock, sock, -1, 0, 0, 0, | |
2314 | originator_string, 1); | |
3a0d3d54 | 2315 | c->remote_id = remote_id; |
5260325f | 2316 | } |
0d942eff | 2317 | xfree(originator_string); |
8e7895b8 | 2318 | if (c == NULL) { |
2319 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
2320 | packet_put_int(remote_id); | |
2321 | packet_send(); | |
2322 | } | |
2323 | xfree(host); | |
8efc0c15 | 2324 | } |
2325 | ||
8e7895b8 | 2326 | |
2327 | /* -- tcp forwarding */ | |
2328 | ||
5e4a7219 | 2329 | void |
2330 | channel_set_af(int af) | |
2331 | { | |
2332 | IPv4or6 = af; | |
2333 | } | |
2334 | ||
5641aefa | 2335 | static int |
2336 | channel_setup_fwd_listener(int type, const char *listen_addr, u_short listen_port, | |
2337 | const char *host_to_connect, u_short port_to_connect, int gateway_ports) | |
8efc0c15 | 2338 | { |
719fc62f | 2339 | Channel *c; |
442aee3a | 2340 | int sock, r, success = 0, wildcard = 0, is_client; |
48e671d5 | 2341 | struct addrinfo hints, *ai, *aitop; |
3867aa0a | 2342 | const char *host, *addr; |
5641aefa | 2343 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
5260325f | 2344 | |
5641aefa | 2345 | host = (type == SSH_CHANNEL_RPORT_LISTENER) ? |
2346 | listen_addr : host_to_connect; | |
3867aa0a | 2347 | is_client = (type == SSH_CHANNEL_PORT_LISTENER); |
02a024dd | 2348 | |
5641aefa | 2349 | if (host == NULL) { |
2350 | error("No forward host name."); | |
38946c65 | 2351 | return 0; |
fa08c86b | 2352 | } |
719fc62f | 2353 | if (strlen(host) > SSH_CHANNEL_PATH_LEN - 1) { |
02a024dd | 2354 | error("Forward host name too long."); |
38946c65 | 2355 | return 0; |
02a024dd | 2356 | } |
5260325f | 2357 | |
3867aa0a | 2358 | /* |
2359 | * Determine whether or not a port forward listens to loopback, | |
f8cc7664 | 2360 | * specified address or wildcard. On the client, a specified bind |
2361 | * address will always override gateway_ports. On the server, a | |
2362 | * gateway_ports of 1 (``yes'') will override the client's | |
2363 | * specification and force a wildcard bind, whereas a value of 2 | |
2364 | * (``clientspecified'') will bind to whatever address the client | |
3867aa0a | 2365 | * asked for. |
2366 | * | |
2367 | * Special-case listen_addrs are: | |
2368 | * | |
2369 | * "0.0.0.0" -> wildcard v4/v6 if SSH_OLD_FORWARD_ADDR | |
2370 | * "" (empty string), "*" -> wildcard v4/v6 | |
2371 | * "localhost" -> loopback v4/v6 | |
2372 | */ | |
2373 | addr = NULL; | |
2374 | if (listen_addr == NULL) { | |
2375 | /* No address specified: default to gateway_ports setting */ | |
2376 | if (gateway_ports) | |
2377 | wildcard = 1; | |
2378 | } else if (gateway_ports || is_client) { | |
2379 | if (((datafellows & SSH_OLD_FORWARD_ADDR) && | |
2380 | strcmp(listen_addr, "0.0.0.0") == 0) || | |
2381 | *listen_addr == '\0' || strcmp(listen_addr, "*") == 0 || | |
2382 | (!is_client && gateway_ports == 1)) | |
2383 | wildcard = 1; | |
2384 | else if (strcmp(listen_addr, "localhost") != 0) | |
2385 | addr = listen_addr; | |
2386 | } | |
2387 | ||
2388 | debug3("channel_setup_fwd_listener: type %d wildcard %d addr %s", | |
2389 | type, wildcard, (addr == NULL) ? "NULL" : addr); | |
2390 | ||
aa3378df | 2391 | /* |
48e671d5 | 2392 | * getaddrinfo returns a loopback address if the hostname is |
2393 | * set to NULL and hints.ai_flags is not AI_PASSIVE | |
aa3378df | 2394 | */ |
48e671d5 | 2395 | memset(&hints, 0, sizeof(hints)); |
2396 | hints.ai_family = IPv4or6; | |
3867aa0a | 2397 | hints.ai_flags = wildcard ? AI_PASSIVE : 0; |
48e671d5 | 2398 | hints.ai_socktype = SOCK_STREAM; |
fa08c86b | 2399 | snprintf(strport, sizeof strport, "%d", listen_port); |
3867aa0a | 2400 | if ((r = getaddrinfo(addr, strport, &hints, &aitop)) != 0) { |
2401 | if (addr == NULL) { | |
2402 | /* This really shouldn't happen */ | |
2403 | packet_disconnect("getaddrinfo: fatal error: %s", | |
2404 | gai_strerror(r)); | |
2405 | } else { | |
38946c65 | 2406 | error("channel_setup_fwd_listener: " |
3867aa0a | 2407 | "getaddrinfo(%.64s): %s", addr, gai_strerror(r)); |
2408 | } | |
38946c65 | 2409 | return 0; |
3867aa0a | 2410 | } |
48e671d5 | 2411 | |
48e671d5 | 2412 | for (ai = aitop; ai; ai = ai->ai_next) { |
2413 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
2414 | continue; | |
2415 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), | |
2416 | strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { | |
5641aefa | 2417 | error("channel_setup_fwd_listener: getnameinfo failed"); |
48e671d5 | 2418 | continue; |
2419 | } | |
2420 | /* Create a port to listen for the host. */ | |
3e131a6d | 2421 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
48e671d5 | 2422 | if (sock < 0) { |
2423 | /* this is no error since kernel may not support ipv6 */ | |
2424 | verbose("socket: %.100s", strerror(errno)); | |
2425 | continue; | |
2426 | } | |
442aee3a | 2427 | |
2428 | channel_set_reuseaddr(sock); | |
facfd613 | 2429 | |
48e671d5 | 2430 | debug("Local forwarding listening on %s port %s.", ntop, strport); |
2431 | ||
2432 | /* Bind the socket to the address. */ | |
2433 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { | |
2434 | /* address can be in use ipv6 address is already bound */ | |
16218745 | 2435 | if (!ai->ai_next) |
2436 | error("bind: %.100s", strerror(errno)); | |
2437 | else | |
2438 | verbose("bind: %.100s", strerror(errno)); | |
2b87da3b | 2439 | |
48e671d5 | 2440 | close(sock); |
2441 | continue; | |
2442 | } | |
2443 | /* Start listening for connections on the socket. */ | |
fce39749 | 2444 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { |
48e671d5 | 2445 | error("listen: %.100s", strerror(errno)); |
2446 | close(sock); | |
2447 | continue; | |
2448 | } | |
2449 | /* Allocate a channel number for the socket. */ | |
8e7895b8 | 2450 | c = channel_new("port listener", type, sock, sock, -1, |
0b242b12 | 2451 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, |
0d942eff | 2452 | 0, "port listener", 1); |
719fc62f | 2453 | strlcpy(c->path, host, sizeof(c->path)); |
2454 | c->host_port = port_to_connect; | |
2455 | c->listening_port = listen_port; | |
48e671d5 | 2456 | success = 1; |
2457 | } | |
2458 | if (success == 0) | |
5641aefa | 2459 | error("channel_setup_fwd_listener: cannot listen to port: %d", |
02a024dd | 2460 | listen_port); |
48e671d5 | 2461 | freeaddrinfo(aitop); |
02a024dd | 2462 | return success; |
5260325f | 2463 | } |
8efc0c15 | 2464 | |
d740ec16 | 2465 | int |
2466 | channel_cancel_rport_listener(const char *host, u_short port) | |
2467 | { | |
9a995072 | 2468 | u_int i; |
2469 | int found = 0; | |
d740ec16 | 2470 | |
f8cc7664 | 2471 | for (i = 0; i < channels_alloc; i++) { |
d740ec16 | 2472 | Channel *c = channels[i]; |
2473 | ||
2474 | if (c != NULL && c->type == SSH_CHANNEL_RPORT_LISTENER && | |
2475 | strncmp(c->path, host, sizeof(c->path)) == 0 && | |
f2107e97 | 2476 | c->listening_port == port) { |
2912cbd6 | 2477 | debug2("%s: close channel %d", __func__, i); |
d740ec16 | 2478 | channel_free(c); |
2479 | found = 1; | |
2480 | } | |
2481 | } | |
2482 | ||
2483 | return (found); | |
2484 | } | |
2485 | ||
5641aefa | 2486 | /* protocol local port fwd, used by ssh (and sshd in v1) */ |
2487 | int | |
3867aa0a | 2488 | channel_setup_local_fwd_listener(const char *listen_host, u_short listen_port, |
5641aefa | 2489 | const char *host_to_connect, u_short port_to_connect, int gateway_ports) |
2490 | { | |
2491 | return channel_setup_fwd_listener(SSH_CHANNEL_PORT_LISTENER, | |
3867aa0a | 2492 | listen_host, listen_port, host_to_connect, port_to_connect, |
2493 | gateway_ports); | |
5641aefa | 2494 | } |
2495 | ||
2496 | /* protocol v2 remote port fwd, used by sshd */ | |
2497 | int | |
2498 | channel_setup_remote_fwd_listener(const char *listen_address, | |
2499 | u_short listen_port, int gateway_ports) | |
2500 | { | |
2501 | return channel_setup_fwd_listener(SSH_CHANNEL_RPORT_LISTENER, | |
2502 | listen_address, listen_port, NULL, 0, gateway_ports); | |
2503 | } | |
2504 | ||
aa3378df | 2505 | /* |
2506 | * Initiate forwarding of connections to port "port" on remote host through | |
2507 | * the secure channel to host:port from local side. | |
2508 | */ | |
8efc0c15 | 2509 | |
42ea6f5e | 2510 | int |
3867aa0a | 2511 | channel_request_remote_forwarding(const char *listen_host, u_short listen_port, |
fa08c86b | 2512 | const char *host_to_connect, u_short port_to_connect) |
8efc0c15 | 2513 | { |
54a5250f | 2514 | int type, success = 0; |
fa08c86b | 2515 | |
5260325f | 2516 | /* Record locally that connection to this host/port is permitted. */ |
2517 | if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
2518 | fatal("channel_request_remote_forwarding: too many forwards"); | |
2519 | ||
5260325f | 2520 | /* Send the forward request to the remote side. */ |
7e7327a1 | 2521 | if (compat20) { |
3867aa0a | 2522 | const char *address_to_bind; |
2523 | if (listen_host == NULL) | |
2524 | address_to_bind = "localhost"; | |
2525 | else if (*listen_host == '\0' || strcmp(listen_host, "*") == 0) | |
2526 | address_to_bind = ""; | |
2527 | else | |
2528 | address_to_bind = listen_host; | |
2529 | ||
7e7327a1 | 2530 | packet_start(SSH2_MSG_GLOBAL_REQUEST); |
2531 | packet_put_cstring("tcpip-forward"); | |
e0ae8728 | 2532 | packet_put_char(1); /* boolean: want reply */ |
7e7327a1 | 2533 | packet_put_cstring(address_to_bind); |
2534 | packet_put_int(listen_port); | |
fa08c86b | 2535 | packet_send(); |
2536 | packet_write_wait(); | |
2537 | /* Assume that server accepts the request */ | |
2538 | success = 1; | |
7e7327a1 | 2539 | } else { |
2540 | packet_start(SSH_CMSG_PORT_FORWARD_REQUEST); | |
7e7327a1 | 2541 | packet_put_int(listen_port); |
d6f24e45 | 2542 | packet_put_cstring(host_to_connect); |
2543 | packet_put_int(port_to_connect); | |
7e7327a1 | 2544 | packet_send(); |
2545 | packet_write_wait(); | |
fa08c86b | 2546 | |
2547 | /* Wait for response from the remote side. */ | |
54a5250f | 2548 | type = packet_read(); |
fa08c86b | 2549 | switch (type) { |
2550 | case SSH_SMSG_SUCCESS: | |
2551 | success = 1; | |
2552 | break; | |
2553 | case SSH_SMSG_FAILURE: | |
fa08c86b | 2554 | break; |
2555 | default: | |
2556 | /* Unknown packet */ | |
2557 | packet_disconnect("Protocol error for port forward request:" | |
2558 | "received packet type %d.", type); | |
2559 | } | |
2560 | } | |
2561 | if (success) { | |
2562 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host_to_connect); | |
2563 | permitted_opens[num_permitted_opens].port_to_connect = port_to_connect; | |
2564 | permitted_opens[num_permitted_opens].listen_port = listen_port; | |
2565 | num_permitted_opens++; | |
7e7327a1 | 2566 | } |
42ea6f5e | 2567 | return (success ? 0 : -1); |
8efc0c15 | 2568 | } |
2569 | ||
d740ec16 | 2570 | /* |
f2107e97 | 2571 | * Request cancellation of remote forwarding of connection host:port from |
d740ec16 | 2572 | * local side. |
2573 | */ | |
d740ec16 | 2574 | void |
3867aa0a | 2575 | channel_request_rforward_cancel(const char *host, u_short port) |
d740ec16 | 2576 | { |
2577 | int i; | |
d740ec16 | 2578 | |
2579 | if (!compat20) | |
2580 | return; | |
2581 | ||
2582 | for (i = 0; i < num_permitted_opens; i++) { | |
f2107e97 | 2583 | if (permitted_opens[i].host_to_connect != NULL && |
d740ec16 | 2584 | permitted_opens[i].listen_port == port) |
2585 | break; | |
2586 | } | |
2587 | if (i >= num_permitted_opens) { | |
2588 | debug("%s: requested forward not found", __func__); | |
2589 | return; | |
2590 | } | |
2591 | packet_start(SSH2_MSG_GLOBAL_REQUEST); | |
2592 | packet_put_cstring("cancel-tcpip-forward"); | |
2593 | packet_put_char(0); | |
3867aa0a | 2594 | packet_put_cstring(host == NULL ? "" : host); |
d740ec16 | 2595 | packet_put_int(port); |
2596 | packet_send(); | |
2597 | ||
2598 | permitted_opens[i].listen_port = 0; | |
2599 | permitted_opens[i].port_to_connect = 0; | |
8c4bd764 | 2600 | xfree(permitted_opens[i].host_to_connect); |
d740ec16 | 2601 | permitted_opens[i].host_to_connect = NULL; |
2602 | } | |
2603 | ||
aa3378df | 2604 | /* |
2605 | * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates | |
2606 | * listening for the port, and sends back a success reply (or disconnect | |
42ea6f5e | 2607 | * message if there was an error). |
aa3378df | 2608 | */ |
42ea6f5e | 2609 | int |
1d1ffb87 | 2610 | channel_input_port_forward_request(int is_root, int gateway_ports) |
8efc0c15 | 2611 | { |
57112b5a | 2612 | u_short port, host_port; |
42ea6f5e | 2613 | int success = 0; |
5260325f | 2614 | char *hostname; |
2615 | ||
2616 | /* Get arguments from the packet. */ | |
2617 | port = packet_get_int(); | |
2618 | hostname = packet_get_string(NULL); | |
2619 | host_port = packet_get_int(); | |
2620 | ||
3c62e7eb | 2621 | #ifndef HAVE_CYGWIN |
aa3378df | 2622 | /* |
2623 | * Check that an unprivileged user is not trying to forward a | |
2624 | * privileged port. | |
2625 | */ | |
5260325f | 2626 | if (port < IPPORT_RESERVED && !is_root) |
8e7c9afc | 2627 | packet_disconnect( |
2628 | "Requested forwarding of port %d but user is not root.", | |
2629 | port); | |
2630 | if (host_port == 0) | |
2631 | packet_disconnect("Dynamic forwarding denied."); | |
3c62e7eb | 2632 | #endif |
8e7c9afc | 2633 | |
fa08c86b | 2634 | /* Initiate forwarding */ |
42ea6f5e | 2635 | success = channel_setup_local_fwd_listener(NULL, port, hostname, |
3867aa0a | 2636 | host_port, gateway_ports); |
5260325f | 2637 | |
2638 | /* Free the argument string. */ | |
2639 | xfree(hostname); | |
42ea6f5e | 2640 | |
2641 | return (success ? 0 : -1); | |
8efc0c15 | 2642 | } |
2643 | ||
01794848 | 2644 | /* |
2645 | * Permits opening to any host/port if permitted_opens[] is empty. This is | |
2646 | * usually called by the server, because the user could connect to any port | |
2647 | * anyway, and the server has no way to know but to trust the client anyway. | |
2648 | */ | |
2649 | void | |
d5bb9418 | 2650 | channel_permit_all_opens(void) |
01794848 | 2651 | { |
2652 | if (num_permitted_opens == 0) | |
2653 | all_opens_permitted = 1; | |
2654 | } | |
2655 | ||
cd332296 | 2656 | void |
01794848 | 2657 | channel_add_permitted_opens(char *host, int port) |
2658 | { | |
2659 | if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
42ea6f5e | 2660 | fatal("channel_add_permitted_opens: too many forwards"); |
01794848 | 2661 | debug("allow port forwarding to host %s port %d", host, port); |
2662 | ||
2663 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host); | |
2664 | permitted_opens[num_permitted_opens].port_to_connect = port; | |
2665 | num_permitted_opens++; | |
2666 | ||
2667 | all_opens_permitted = 0; | |
2668 | } | |
2669 | ||
ea46e550 | 2670 | int |
2fefbadf | 2671 | channel_add_adm_permitted_opens(char *host, int port) |
2672 | { | |
2673 | if (num_adm_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
2674 | fatal("channel_add_adm_permitted_opens: too many forwards"); | |
ea46e550 | 2675 | debug("config allows port forwarding to host %s port %d", host, port); |
2fefbadf | 2676 | |
2677 | permitted_adm_opens[num_adm_permitted_opens].host_to_connect | |
2678 | = xstrdup(host); | |
2679 | permitted_adm_opens[num_adm_permitted_opens].port_to_connect = port; | |
ea46e550 | 2680 | return ++num_adm_permitted_opens; |
2fefbadf | 2681 | } |
2682 | ||
cd332296 | 2683 | void |
01794848 | 2684 | channel_clear_permitted_opens(void) |
2685 | { | |
2686 | int i; | |
2687 | ||
2688 | for (i = 0; i < num_permitted_opens; i++) | |
d740ec16 | 2689 | if (permitted_opens[i].host_to_connect != NULL) |
2690 | xfree(permitted_opens[i].host_to_connect); | |
01794848 | 2691 | num_permitted_opens = 0; |
2fefbadf | 2692 | } |
2693 | ||
2694 | void | |
2695 | channel_clear_adm_permitted_opens(void) | |
2696 | { | |
2697 | int i; | |
01794848 | 2698 | |
2fefbadf | 2699 | for (i = 0; i < num_adm_permitted_opens; i++) |
2700 | if (permitted_adm_opens[i].host_to_connect != NULL) | |
2701 | xfree(permitted_adm_opens[i].host_to_connect); | |
2702 | num_adm_permitted_opens = 0; | |
01794848 | 2703 | } |
2704 | ||
01794848 | 2705 | /* return socket to remote host, port */ |
396c147e | 2706 | static int |
01794848 | 2707 | connect_to(const char *host, u_short port) |
8efc0c15 | 2708 | { |
48e671d5 | 2709 | struct addrinfo hints, *ai, *aitop; |
2710 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; | |
2711 | int gaierr; | |
7368a6c8 | 2712 | int sock = -1; |
48e671d5 | 2713 | |
2714 | memset(&hints, 0, sizeof(hints)); | |
2715 | hints.ai_family = IPv4or6; | |
2716 | hints.ai_socktype = SOCK_STREAM; | |
01794848 | 2717 | snprintf(strport, sizeof strport, "%d", port); |
48e671d5 | 2718 | if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) { |
01794848 | 2719 | error("connect_to %.100s: unknown host (%s)", host, |
2720 | gai_strerror(gaierr)); | |
7368a6c8 | 2721 | return -1; |
48e671d5 | 2722 | } |
48e671d5 | 2723 | for (ai = aitop; ai; ai = ai->ai_next) { |
2724 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
2725 | continue; | |
2726 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), | |
2727 | strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { | |
01794848 | 2728 | error("connect_to: getnameinfo failed"); |
48e671d5 | 2729 | continue; |
5260325f | 2730 | } |
3e131a6d | 2731 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
48e671d5 | 2732 | if (sock < 0) { |
4940c411 | 2733 | if (ai->ai_next == NULL) |
2734 | error("socket: %.100s", strerror(errno)); | |
2735 | else | |
2736 | verbose("socket: %.100s", strerror(errno)); | |
48e671d5 | 2737 | continue; |
5260325f | 2738 | } |
170694d7 | 2739 | if (set_nonblock(sock) == -1) |
2740 | fatal("%s: set_nonblock(%d)", __func__, sock); | |
97fb6912 | 2741 | if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0 && |
2742 | errno != EINPROGRESS) { | |
01794848 | 2743 | error("connect_to %.100s port %s: %.100s", ntop, strport, |
48e671d5 | 2744 | strerror(errno)); |
2745 | close(sock); | |
2b87da3b | 2746 | continue; /* fail -- try next */ |
48e671d5 | 2747 | } |
2748 | break; /* success */ | |
5260325f | 2749 | |
5260325f | 2750 | } |
48e671d5 | 2751 | freeaddrinfo(aitop); |
48e671d5 | 2752 | if (!ai) { |
01794848 | 2753 | error("connect_to %.100s port %d: failed.", host, port); |
7368a6c8 | 2754 | return -1; |
8efc0c15 | 2755 | } |
7368a6c8 | 2756 | /* success */ |
811a6342 | 2757 | set_nodelay(sock); |
7368a6c8 | 2758 | return sock; |
2759 | } | |
01794848 | 2760 | |
fa08c86b | 2761 | int |
b3f8a79c | 2762 | channel_connect_by_listen_address(u_short listen_port) |
fa08c86b | 2763 | { |
2764 | int i; | |
01794848 | 2765 | |
fa08c86b | 2766 | for (i = 0; i < num_permitted_opens; i++) |
d740ec16 | 2767 | if (permitted_opens[i].host_to_connect != NULL && |
2768 | permitted_opens[i].listen_port == listen_port) | |
01794848 | 2769 | return connect_to( |
fa08c86b | 2770 | permitted_opens[i].host_to_connect, |
2771 | permitted_opens[i].port_to_connect); | |
0b6fbf03 | 2772 | error("WARNING: Server requests forwarding for unknown listen_port %d", |
2773 | listen_port); | |
fa08c86b | 2774 | return -1; |
2775 | } | |
48e671d5 | 2776 | |
01794848 | 2777 | /* Check if connecting to that port is permitted and connect. */ |
2778 | int | |
2779 | channel_connect_to(const char *host, u_short port) | |
2780 | { | |
2fefbadf | 2781 | int i, permit, permit_adm = 1; |
01794848 | 2782 | |
2783 | permit = all_opens_permitted; | |
2784 | if (!permit) { | |
2785 | for (i = 0; i < num_permitted_opens; i++) | |
d740ec16 | 2786 | if (permitted_opens[i].host_to_connect != NULL && |
2787 | permitted_opens[i].port_to_connect == port && | |
01794848 | 2788 | strcmp(permitted_opens[i].host_to_connect, host) == 0) |
2789 | permit = 1; | |
2fefbadf | 2790 | } |
01794848 | 2791 | |
2fefbadf | 2792 | if (num_adm_permitted_opens > 0) { |
2793 | permit_adm = 0; | |
2794 | for (i = 0; i < num_adm_permitted_opens; i++) | |
2795 | if (permitted_adm_opens[i].host_to_connect != NULL && | |
2796 | permitted_adm_opens[i].port_to_connect == port && | |
2797 | strcmp(permitted_adm_opens[i].host_to_connect, host) | |
2798 | == 0) | |
2799 | permit_adm = 1; | |
01794848 | 2800 | } |
2fefbadf | 2801 | |
2802 | if (!permit || !permit_adm) { | |
bbe88b6d | 2803 | logit("Received request to connect to host %.100s port %d, " |
01794848 | 2804 | "but the request was denied.", host, port); |
2805 | return -1; | |
2806 | } | |
2807 | return connect_to(host, port); | |
2808 | } | |
2809 | ||
5e96b616 | 2810 | void |
2811 | channel_send_window_changes(void) | |
2812 | { | |
9a995072 | 2813 | u_int i; |
5e96b616 | 2814 | struct winsize ws; |
2815 | ||
2816 | for (i = 0; i < channels_alloc; i++) { | |
f8cc7664 | 2817 | if (channels[i] == NULL || !channels[i]->client_tty || |
5e96b616 | 2818 | channels[i]->type != SSH_CHANNEL_OPEN) |
2819 | continue; | |
2820 | if (ioctl(channels[i]->rfd, TIOCGWINSZ, &ws) < 0) | |
2821 | continue; | |
2822 | channel_request_start(i, "window-change", 0); | |
148de80c | 2823 | packet_put_int((u_int)ws.ws_col); |
2824 | packet_put_int((u_int)ws.ws_row); | |
2825 | packet_put_int((u_int)ws.ws_xpixel); | |
2826 | packet_put_int((u_int)ws.ws_ypixel); | |
5e96b616 | 2827 | packet_send(); |
2828 | } | |
2829 | } | |
2830 | ||
8e7895b8 | 2831 | /* -- X11 forwarding */ |
8efc0c15 | 2832 | |
aa3378df | 2833 | /* |
2834 | * Creates an internet domain socket for listening for X11 connections. | |
57f228e8 | 2835 | * Returns 0 and a suitable display number for the DISPLAY variable |
2836 | * stored in display_numberp , or -1 if an error occurs. | |
aa3378df | 2837 | */ |
c9d0ad9b | 2838 | int |
e6e573bd | 2839 | x11_create_display_inet(int x11_display_offset, int x11_use_localhost, |
d08341e6 | 2840 | int single_connection, u_int *display_numberp, int **chanids) |
8efc0c15 | 2841 | { |
ac151b18 | 2842 | Channel *nc = NULL; |
57112b5a | 2843 | int display_number, sock; |
2844 | u_short port; | |
48e671d5 | 2845 | struct addrinfo hints, *ai, *aitop; |
2846 | char strport[NI_MAXSERV]; | |
2847 | int gaierr, n, num_socks = 0, socks[NUM_SOCKS]; | |
5260325f | 2848 | |
59e5aff5 | 2849 | if (chanids == NULL) |
2850 | return -1; | |
2851 | ||
95f1eccc | 2852 | for (display_number = x11_display_offset; |
184eed6a | 2853 | display_number < MAX_DISPLAYS; |
2854 | display_number++) { | |
5260325f | 2855 | port = 6000 + display_number; |
48e671d5 | 2856 | memset(&hints, 0, sizeof(hints)); |
2857 | hints.ai_family = IPv4or6; | |
e6e573bd | 2858 | hints.ai_flags = x11_use_localhost ? 0: AI_PASSIVE; |
48e671d5 | 2859 | hints.ai_socktype = SOCK_STREAM; |
2860 | snprintf(strport, sizeof strport, "%d", port); | |
2861 | if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) { | |
2862 | error("getaddrinfo: %.100s", gai_strerror(gaierr)); | |
c9d0ad9b | 2863 | return -1; |
5260325f | 2864 | } |
48e671d5 | 2865 | for (ai = aitop; ai; ai = ai->ai_next) { |
2866 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
2867 | continue; | |
3e131a6d | 2868 | sock = socket(ai->ai_family, ai->ai_socktype, |
2869 | ai->ai_protocol); | |
48e671d5 | 2870 | if (sock < 0) { |
4ee81249 | 2871 | if ((errno != EINVAL) && (errno != EAFNOSUPPORT)) { |
80a44451 | 2872 | error("socket: %.100s", strerror(errno)); |
0ea89f7e | 2873 | freeaddrinfo(aitop); |
c9d0ad9b | 2874 | return -1; |
80a44451 | 2875 | } else { |
22d89d24 | 2876 | debug("x11_create_display_inet: Socket family %d not supported", |
2877 | ai->ai_family); | |
80a44451 | 2878 | continue; |
2879 | } | |
48e671d5 | 2880 | } |
688aaeda | 2881 | #ifdef IPV6_V6ONLY |
2882 | if (ai->ai_family == AF_INET6) { | |
2883 | int on = 1; | |
2884 | if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) < 0) | |
2885 | error("setsockopt IPV6_V6ONLY: %.100s", strerror(errno)); | |
2886 | } | |
2887 | #endif | |
442aee3a | 2888 | channel_set_reuseaddr(sock); |
48e671d5 | 2889 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { |
d7ac5f18 | 2890 | debug2("bind port %d: %.100s", port, strerror(errno)); |
48e671d5 | 2891 | close(sock); |
16218745 | 2892 | |
2893 | if (ai->ai_next) | |
2894 | continue; | |
2895 | ||
48e671d5 | 2896 | for (n = 0; n < num_socks; n++) { |
48e671d5 | 2897 | close(socks[n]); |
2898 | } | |
2899 | num_socks = 0; | |
2900 | break; | |
2901 | } | |
2902 | socks[num_socks++] = sock; | |
80faa19f | 2903 | #ifndef DONT_TRY_OTHER_AF |
48e671d5 | 2904 | if (num_socks == NUM_SOCKS) |
2905 | break; | |
80faa19f | 2906 | #else |
688aaeda | 2907 | if (x11_use_localhost) { |
2908 | if (num_socks == NUM_SOCKS) | |
2909 | break; | |
2910 | } else { | |
2911 | break; | |
2912 | } | |
80faa19f | 2913 | #endif |
5260325f | 2914 | } |
4ccb01d6 | 2915 | freeaddrinfo(aitop); |
48e671d5 | 2916 | if (num_socks > 0) |
2917 | break; | |
5260325f | 2918 | } |
2919 | if (display_number >= MAX_DISPLAYS) { | |
2920 | error("Failed to allocate internet-domain X11 display socket."); | |
c9d0ad9b | 2921 | return -1; |
8efc0c15 | 2922 | } |
5260325f | 2923 | /* Start listening for connections on the socket. */ |
48e671d5 | 2924 | for (n = 0; n < num_socks; n++) { |
2925 | sock = socks[n]; | |
fce39749 | 2926 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { |
48e671d5 | 2927 | error("listen: %.100s", strerror(errno)); |
48e671d5 | 2928 | close(sock); |
c9d0ad9b | 2929 | return -1; |
a7effaac | 2930 | } |
a7effaac | 2931 | } |
5260325f | 2932 | |
48e671d5 | 2933 | /* Allocate a channel for each socket. */ |
52e3daed | 2934 | *chanids = xcalloc(num_socks + 1, sizeof(**chanids)); |
48e671d5 | 2935 | for (n = 0; n < num_socks; n++) { |
2936 | sock = socks[n]; | |
ac151b18 | 2937 | nc = channel_new("x11 listener", |
0b242b12 | 2938 | SSH_CHANNEL_X11_LISTENER, sock, sock, -1, |
2939 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, | |
0d942eff | 2940 | 0, "X11 inet listener", 1); |
3a0d3d54 | 2941 | nc->single_connection = single_connection; |
59e5aff5 | 2942 | (*chanids)[n] = nc->self; |
48e671d5 | 2943 | } |
59e5aff5 | 2944 | (*chanids)[n] = -1; |
5260325f | 2945 | |
c9d0ad9b | 2946 | /* Return the display number for the DISPLAY environment variable. */ |
57f228e8 | 2947 | *display_numberp = display_number; |
2948 | return (0); | |
8efc0c15 | 2949 | } |
2950 | ||
396c147e | 2951 | static int |
1e3b8b07 | 2952 | connect_local_xsocket(u_int dnr) |
8efc0c15 | 2953 | { |
5260325f | 2954 | int sock; |
2955 | struct sockaddr_un addr; | |
5260325f | 2956 | |
805e659f | 2957 | sock = socket(AF_UNIX, SOCK_STREAM, 0); |
2958 | if (sock < 0) | |
2959 | error("socket: %.100s", strerror(errno)); | |
2960 | memset(&addr, 0, sizeof(addr)); | |
2961 | addr.sun_family = AF_UNIX; | |
2962 | snprintf(addr.sun_path, sizeof addr.sun_path, _PATH_UNIX_X, dnr); | |
32596c7b | 2963 | if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) == 0) |
805e659f | 2964 | return sock; |
2965 | close(sock); | |
5260325f | 2966 | error("connect %.100s: %.100s", addr.sun_path, strerror(errno)); |
2967 | return -1; | |
8efc0c15 | 2968 | } |
2969 | ||
0b242b12 | 2970 | int |
2971 | x11_connect_display(void) | |
8efc0c15 | 2972 | { |
4f16046f | 2973 | u_int display_number; |
5260325f | 2974 | const char *display; |
0b242b12 | 2975 | char buf[1024], *cp; |
48e671d5 | 2976 | struct addrinfo hints, *ai, *aitop; |
2977 | char strport[NI_MAXSERV]; | |
4f16046f | 2978 | int gaierr, sock = 0; |
5260325f | 2979 | |
5260325f | 2980 | /* Try to open a socket for the local X server. */ |
2981 | display = getenv("DISPLAY"); | |
2982 | if (!display) { | |
2983 | error("DISPLAY not set."); | |
0b242b12 | 2984 | return -1; |
5260325f | 2985 | } |
aa3378df | 2986 | /* |
2987 | * Now we decode the value of the DISPLAY variable and make a | |
2988 | * connection to the real X server. | |
2989 | */ | |
2990 | ||
2991 | /* | |
2992 | * Check if it is a unix domain socket. Unix domain displays are in | |
2993 | * one of the following formats: unix:d[.s], :d[.s], ::d[.s] | |
2994 | */ | |
5260325f | 2995 | if (strncmp(display, "unix:", 5) == 0 || |
2996 | display[0] == ':') { | |
2997 | /* Connect to the unix domain socket. */ | |
4f16046f | 2998 | if (sscanf(strrchr(display, ':') + 1, "%u", &display_number) != 1) { |
5260325f | 2999 | error("Could not parse display number from DISPLAY: %.100s", |
184eed6a | 3000 | display); |
0b242b12 | 3001 | return -1; |
5260325f | 3002 | } |
3003 | /* Create a socket. */ | |
3004 | sock = connect_local_xsocket(display_number); | |
3005 | if (sock < 0) | |
0b242b12 | 3006 | return -1; |
5260325f | 3007 | |
3008 | /* OK, we now have a connection to the display. */ | |
0b242b12 | 3009 | return sock; |
5260325f | 3010 | } |
aa3378df | 3011 | /* |
3012 | * Connect to an inet socket. The DISPLAY value is supposedly | |
3013 | * hostname:d[.s], where hostname may also be numeric IP address. | |
3014 | */ | |
74860245 | 3015 | strlcpy(buf, display, sizeof(buf)); |
5260325f | 3016 | cp = strchr(buf, ':'); |
3017 | if (!cp) { | |
3018 | error("Could not find ':' in DISPLAY: %.100s", display); | |
0b242b12 | 3019 | return -1; |
5260325f | 3020 | } |
3021 | *cp = 0; | |
aa3378df | 3022 | /* buf now contains the host name. But first we parse the display number. */ |
4f16046f | 3023 | if (sscanf(cp + 1, "%u", &display_number) != 1) { |
5260325f | 3024 | error("Could not parse display number from DISPLAY: %.100s", |
184eed6a | 3025 | display); |
0b242b12 | 3026 | return -1; |
5260325f | 3027 | } |
5260325f | 3028 | |
48e671d5 | 3029 | /* Look up the host address */ |
3030 | memset(&hints, 0, sizeof(hints)); | |
3031 | hints.ai_family = IPv4or6; | |
3032 | hints.ai_socktype = SOCK_STREAM; | |
4f16046f | 3033 | snprintf(strport, sizeof strport, "%u", 6000 + display_number); |
48e671d5 | 3034 | if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) { |
3035 | error("%.100s: unknown host. (%s)", buf, gai_strerror(gaierr)); | |
0b242b12 | 3036 | return -1; |
8efc0c15 | 3037 | } |
48e671d5 | 3038 | for (ai = aitop; ai; ai = ai->ai_next) { |
3039 | /* Create a socket. */ | |
3e131a6d | 3040 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
48e671d5 | 3041 | if (sock < 0) { |
d7ac5f18 | 3042 | debug2("socket: %.100s", strerror(errno)); |
7368a6c8 | 3043 | continue; |
3044 | } | |
3045 | /* Connect it to the display. */ | |
3046 | if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) { | |
4f16046f | 3047 | debug2("connect %.100s port %u: %.100s", buf, |
7368a6c8 | 3048 | 6000 + display_number, strerror(errno)); |
3049 | close(sock); | |
3050 | continue; | |
3051 | } | |
3052 | /* Success */ | |
3053 | break; | |
48e671d5 | 3054 | } |
48e671d5 | 3055 | freeaddrinfo(aitop); |
3056 | if (!ai) { | |
4f16046f | 3057 | error("connect %.100s port %u: %.100s", buf, 6000 + display_number, |
48e671d5 | 3058 | strerror(errno)); |
0b242b12 | 3059 | return -1; |
8efc0c15 | 3060 | } |
bcc0381e | 3061 | set_nodelay(sock); |
0b242b12 | 3062 | return sock; |
3063 | } | |
5260325f | 3064 | |
0b242b12 | 3065 | /* |
3066 | * This is called when SSH_SMSG_X11_OPEN is received. The packet contains | |
3067 | * the remote channel number. We should do whatever we want, and respond | |
3068 | * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE. | |
3069 | */ | |
5260325f | 3070 | |
ebb90778 | 3071 | /* ARGSUSED */ |
0b242b12 | 3072 | void |
7819b5c3 | 3073 | x11_input_open(int type, u_int32_t seq, void *ctxt) |
0b242b12 | 3074 | { |
719fc62f | 3075 | Channel *c = NULL; |
3076 | int remote_id, sock = 0; | |
0b242b12 | 3077 | char *remote_host; |
5260325f | 3078 | |
719fc62f | 3079 | debug("Received X11 open request."); |
5260325f | 3080 | |
719fc62f | 3081 | remote_id = packet_get_int(); |
8e7895b8 | 3082 | |
3083 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) { | |
719fc62f | 3084 | remote_host = packet_get_string(NULL); |
0b242b12 | 3085 | } else { |
3086 | remote_host = xstrdup("unknown (remote did not supply name)"); | |
0b242b12 | 3087 | } |
95500969 | 3088 | packet_check_eom(); |
0b242b12 | 3089 | |
3090 | /* Obtain a connection to the real X display. */ | |
3091 | sock = x11_connect_display(); | |
719fc62f | 3092 | if (sock != -1) { |
3093 | /* Allocate a channel for this connection. */ | |
3094 | c = channel_new("connected x11 socket", | |
3095 | SSH_CHANNEL_X11_OPEN, sock, sock, -1, 0, 0, 0, | |
3096 | remote_host, 1); | |
3a0d3d54 | 3097 | c->remote_id = remote_id; |
3098 | c->force_drain = 1; | |
719fc62f | 3099 | } |
0d942eff | 3100 | xfree(remote_host); |
719fc62f | 3101 | if (c == NULL) { |
0b242b12 | 3102 | /* Send refusal to the remote host. */ |
3103 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
719fc62f | 3104 | packet_put_int(remote_id); |
0b242b12 | 3105 | } else { |
0b242b12 | 3106 | /* Send a confirmation to the remote host. */ |
3107 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
719fc62f | 3108 | packet_put_int(remote_id); |
3109 | packet_put_int(c->self); | |
0b242b12 | 3110 | } |
719fc62f | 3111 | packet_send(); |
8efc0c15 | 3112 | } |
3113 | ||
a22aff1f | 3114 | /* dummy protocol handler that denies SSH-1 requests (agent/x11) */ |
ebb90778 | 3115 | /* ARGSUSED */ |
a22aff1f | 3116 | void |
7819b5c3 | 3117 | deny_input_open(int type, u_int32_t seq, void *ctxt) |
a22aff1f | 3118 | { |
3119 | int rchan = packet_get_int(); | |
e1feb9bf | 3120 | |
6aacefa7 | 3121 | switch (type) { |
a22aff1f | 3122 | case SSH_SMSG_AGENT_OPEN: |
3123 | error("Warning: ssh server tried agent forwarding."); | |
3124 | break; | |
3125 | case SSH_SMSG_X11_OPEN: | |
3126 | error("Warning: ssh server tried X11 forwarding."); | |
3127 | break; | |
3128 | default: | |
7819b5c3 | 3129 | error("deny_input_open: type %d", type); |
a22aff1f | 3130 | break; |
3131 | } | |
1908529f | 3132 | error("Warning: this is probably a break-in attempt by a malicious server."); |
a22aff1f | 3133 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
3134 | packet_put_int(rchan); | |
3135 | packet_send(); | |
3136 | } | |
3137 | ||
aa3378df | 3138 | /* |
3139 | * Requests forwarding of X11 connections, generates fake authentication | |
3140 | * data, and enables authentication spoofing. | |
8e7895b8 | 3141 | * This should be called in the client only. |
aa3378df | 3142 | */ |
6ae2364d | 3143 | void |
9bf083eb | 3144 | x11_request_forwarding_with_spoofing(int client_session_id, const char *disp, |
0b242b12 | 3145 | const char *proto, const char *data) |
8efc0c15 | 3146 | { |
1e3b8b07 | 3147 | u_int data_len = (u_int) strlen(data) / 2; |
ef07103c | 3148 | u_int i, value; |
5260325f | 3149 | char *new_data; |
3150 | int screen_number; | |
3151 | const char *cp; | |
ca75d7de | 3152 | u_int32_t rnd = 0; |
5260325f | 3153 | |
4297b666 | 3154 | if (x11_saved_display == NULL) |
3155 | x11_saved_display = xstrdup(disp); | |
3156 | else if (strcmp(disp, x11_saved_display) != 0) { | |
ef07103c | 3157 | error("x11_request_forwarding_with_spoofing: different " |
3158 | "$DISPLAY already forwarded"); | |
3159 | return; | |
3160 | } | |
3161 | ||
9bf083eb | 3162 | cp = disp; |
3163 | if (disp) | |
3164 | cp = strchr(disp, ':'); | |
5260325f | 3165 | if (cp) |
3166 | cp = strchr(cp, '.'); | |
3167 | if (cp) | |
d6d4897e | 3168 | screen_number = (u_int)strtonum(cp + 1, 0, 400, NULL); |
5260325f | 3169 | else |
3170 | screen_number = 0; | |
3171 | ||
ef07103c | 3172 | if (x11_saved_proto == NULL) { |
3173 | /* Save protocol name. */ | |
3174 | x11_saved_proto = xstrdup(proto); | |
3175 | /* | |
56964485 | 3176 | * Extract real authentication data and generate fake data |
ef07103c | 3177 | * of the same length. |
3178 | */ | |
3179 | x11_saved_data = xmalloc(data_len); | |
3180 | x11_fake_data = xmalloc(data_len); | |
3181 | for (i = 0; i < data_len; i++) { | |
3182 | if (sscanf(data + 2 * i, "%2x", &value) != 1) | |
3183 | fatal("x11_request_forwarding: bad " | |
3184 | "authentication data: %.100s", data); | |
3185 | if (i % 4 == 0) | |
3186 | rnd = arc4random(); | |
3187 | x11_saved_data[i] = value; | |
3188 | x11_fake_data[i] = rnd & 0xff; | |
3189 | rnd >>= 8; | |
3190 | } | |
3191 | x11_saved_data_len = data_len; | |
3192 | x11_fake_data_len = data_len; | |
3193 | } | |
5260325f | 3194 | |
3195 | /* Convert the fake data into hex. */ | |
ef07103c | 3196 | new_data = tohex(x11_fake_data, data_len); |
5260325f | 3197 | |
3198 | /* Send the request packet. */ | |
0b242b12 | 3199 | if (compat20) { |
3200 | channel_request_start(client_session_id, "x11-req", 0); | |
3201 | packet_put_char(0); /* XXX bool single connection */ | |
3202 | } else { | |
3203 | packet_start(SSH_CMSG_X11_REQUEST_FORWARDING); | |
3204 | } | |
3205 | packet_put_cstring(proto); | |
3206 | packet_put_cstring(new_data); | |
5260325f | 3207 | packet_put_int(screen_number); |
3208 | packet_send(); | |
3209 | packet_write_wait(); | |
3210 | xfree(new_data); | |
8efc0c15 | 3211 | } |
3212 | ||
8e7895b8 | 3213 | |
3214 | /* -- agent forwarding */ | |
3215 | ||
8efc0c15 | 3216 | /* Sends a message to the server to request authentication fd forwarding. */ |
3217 | ||
6ae2364d | 3218 | void |
d5bb9418 | 3219 | auth_request_forwarding(void) |
8efc0c15 | 3220 | { |
5260325f | 3221 | packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING); |
3222 | packet_send(); | |
3223 | packet_write_wait(); | |
8efc0c15 | 3224 | } |