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e264ac72 | 1 | /* $OpenBSD: channels.c,v 1.261 2006/07/25 02:59:21 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> |
e264ac72 | 48 | #ifdef HAVE_SYS_TIME_H |
49 | # include <sys/time.h> | |
50 | #endif | |
319d6b41 | 51 | |
52 | #include <netinet/in.h> | |
53 | #include <arpa/inet.h> | |
1d3e026f | 54 | |
028094f4 | 55 | #include <errno.h> |
28cb0a43 | 56 | #include <netdb.h> |
00146caa | 57 | #include <string.h> |
1d3e026f | 58 | #include <termios.h> |
5188ba17 | 59 | #include <unistd.h> |
8efc0c15 | 60 | |
61 | #include "ssh.h" | |
42f11eb2 | 62 | #include "ssh1.h" |
63 | #include "ssh2.h" | |
8efc0c15 | 64 | #include "packet.h" |
65 | #include "xmalloc.h" | |
42f11eb2 | 66 | #include "log.h" |
67 | #include "misc.h" | |
8efc0c15 | 68 | #include "channels.h" |
8efc0c15 | 69 | #include "compat.h" |
42f11eb2 | 70 | #include "canohost.h" |
4c8722d9 | 71 | #include "key.h" |
72 | #include "authfd.h" | |
805e659f | 73 | #include "pathnames.h" |
f49658f5 | 74 | #include "bufaux.h" |
8efc0c15 | 75 | |
8e7895b8 | 76 | /* -- channel core */ |
8efc0c15 | 77 | |
aa3378df | 78 | /* |
79 | * Pointer to an array containing all allocated channels. The array is | |
80 | * dynamically extended as needed. | |
81 | */ | |
719fc62f | 82 | static Channel **channels = NULL; |
8efc0c15 | 83 | |
aa3378df | 84 | /* |
85 | * Size of the channel array. All slots of the array must always be | |
719fc62f | 86 | * initialized (at least the type field); unused slots set to NULL |
aa3378df | 87 | */ |
9a995072 | 88 | static u_int channels_alloc = 0; |
8efc0c15 | 89 | |
aa3378df | 90 | /* |
91 | * Maximum file descriptor value used in any of the channels. This is | |
719fc62f | 92 | * updated in channel_new. |
aa3378df | 93 | */ |
39929cdb | 94 | static int channel_max_fd = 0; |
8efc0c15 | 95 | |
8efc0c15 | 96 | |
8e7895b8 | 97 | /* -- tcp forwarding */ |
8efc0c15 | 98 | |
aa3378df | 99 | /* |
100 | * Data structure for storing which hosts are permitted for forward requests. | |
101 | * The local sides of any remote forwards are stored in this array to prevent | |
102 | * a corrupt remote server from accessing arbitrary TCP/IP ports on our local | |
103 | * network (which might be behind a firewall). | |
104 | */ | |
5260325f | 105 | typedef struct { |
7368a6c8 | 106 | char *host_to_connect; /* Connect to 'host'. */ |
107 | u_short port_to_connect; /* Connect to 'port'. */ | |
108 | u_short listen_port; /* Remote side should listen port number. */ | |
8efc0c15 | 109 | } ForwardPermission; |
110 | ||
2fefbadf | 111 | /* List of all permitted host/port pairs to connect by the user. */ |
8efc0c15 | 112 | static ForwardPermission permitted_opens[SSH_MAX_FORWARDS_PER_DIRECTION]; |
8e7895b8 | 113 | |
2fefbadf | 114 | /* List of all permitted host/port pairs to connect by the admin. */ |
115 | static ForwardPermission permitted_adm_opens[SSH_MAX_FORWARDS_PER_DIRECTION]; | |
116 | ||
117 | /* Number of permitted host/port pairs in the array permitted by the user. */ | |
8efc0c15 | 118 | static int num_permitted_opens = 0; |
2fefbadf | 119 | |
120 | /* Number of permitted host/port pair in the array permitted by the admin. */ | |
121 | static int num_adm_permitted_opens = 0; | |
122 | ||
aa3378df | 123 | /* |
124 | * If this is true, all opens are permitted. This is the case on the server | |
125 | * on which we have to trust the client anyway, and the user could do | |
126 | * anything after logging in anyway. | |
127 | */ | |
8efc0c15 | 128 | static int all_opens_permitted = 0; |
129 | ||
8efc0c15 | 130 | |
8e7895b8 | 131 | /* -- X11 forwarding */ |
42f11eb2 | 132 | |
8e7895b8 | 133 | /* Maximum number of fake X11 displays to try. */ |
134 | #define MAX_DISPLAYS 1000 | |
0490e609 | 135 | |
ef07103c | 136 | /* Saved X11 local (client) display. */ |
137 | static char *x11_saved_display = NULL; | |
138 | ||
8e7895b8 | 139 | /* Saved X11 authentication protocol name. */ |
140 | static char *x11_saved_proto = NULL; | |
8efc0c15 | 141 | |
8e7895b8 | 142 | /* Saved X11 authentication data. This is the real data. */ |
143 | static char *x11_saved_data = NULL; | |
144 | static u_int x11_saved_data_len = 0; | |
145 | ||
146 | /* | |
147 | * Fake X11 authentication data. This is what the server will be sending us; | |
148 | * we should replace any occurrences of this by the real data. | |
149 | */ | |
338eb2ab | 150 | static u_char *x11_fake_data = NULL; |
8e7895b8 | 151 | static u_int x11_fake_data_len; |
152 | ||
153 | ||
154 | /* -- agent forwarding */ | |
8efc0c15 | 155 | |
8e7895b8 | 156 | #define NUM_SOCKS 10 |
157 | ||
8e7895b8 | 158 | /* AF_UNSPEC or AF_INET or AF_INET6 */ |
5e4a7219 | 159 | static int IPv4or6 = AF_UNSPEC; |
8e7895b8 | 160 | |
161 | /* helper */ | |
396c147e | 162 | static void port_open_helper(Channel *c, char *rtype); |
8e7895b8 | 163 | |
164 | /* -- channel core */ | |
7368a6c8 | 165 | |
166 | Channel * | |
b872f7f0 | 167 | channel_by_id(int id) |
7368a6c8 | 168 | { |
169 | Channel *c; | |
719fc62f | 170 | |
9a995072 | 171 | if (id < 0 || (u_int)id >= channels_alloc) { |
b872f7f0 | 172 | logit("channel_by_id: %d: bad id", id); |
7368a6c8 | 173 | return NULL; |
174 | } | |
719fc62f | 175 | c = channels[id]; |
176 | if (c == NULL) { | |
b872f7f0 | 177 | logit("channel_by_id: %d: bad id: channel free", id); |
7368a6c8 | 178 | return NULL; |
179 | } | |
180 | return c; | |
181 | } | |
182 | ||
b872f7f0 | 183 | /* |
184 | * Returns the channel if it is allowed to receive protocol messages. | |
185 | * Private channels, like listening sockets, may not receive messages. | |
186 | */ | |
187 | Channel * | |
188 | channel_lookup(int id) | |
189 | { | |
190 | Channel *c; | |
191 | ||
192 | if ((c = channel_by_id(id)) == NULL) | |
193 | return (NULL); | |
194 | ||
c8e9c167 | 195 | switch (c->type) { |
b872f7f0 | 196 | case SSH_CHANNEL_X11_OPEN: |
197 | case SSH_CHANNEL_LARVAL: | |
198 | case SSH_CHANNEL_CONNECTING: | |
199 | case SSH_CHANNEL_DYNAMIC: | |
200 | case SSH_CHANNEL_OPENING: | |
201 | case SSH_CHANNEL_OPEN: | |
202 | case SSH_CHANNEL_INPUT_DRAINING: | |
203 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
204 | return (c); | |
b872f7f0 | 205 | } |
206 | logit("Non-public channel %d, type %d.", id, c->type); | |
207 | return (NULL); | |
208 | } | |
209 | ||
aa3378df | 210 | /* |
1d1ffb87 | 211 | * Register filedescriptors for a channel, used when allocating a channel or |
0fbe8c74 | 212 | * when the channel consumer/producer is ready, e.g. shell exec'd |
aa3378df | 213 | */ |
396c147e | 214 | static void |
a22aff1f | 215 | channel_register_fds(Channel *c, int rfd, int wfd, int efd, |
216 | int extusage, int nonblock) | |
8efc0c15 | 217 | { |
5260325f | 218 | /* Update the maximum file descriptor value. */ |
39929cdb | 219 | channel_max_fd = MAX(channel_max_fd, rfd); |
220 | channel_max_fd = MAX(channel_max_fd, wfd); | |
221 | channel_max_fd = MAX(channel_max_fd, efd); | |
222 | ||
aa3378df | 223 | /* XXX set close-on-exec -markus */ |
1d1ffb87 | 224 | |
0fbe8c74 | 225 | c->rfd = rfd; |
226 | c->wfd = wfd; | |
227 | c->sock = (rfd == wfd) ? rfd : -1; | |
5e96b616 | 228 | c->ctl_fd = -1; /* XXX: set elsewhere */ |
0fbe8c74 | 229 | c->efd = efd; |
230 | c->extended_usage = extusage; | |
a22aff1f | 231 | |
0ae4fe1d | 232 | /* XXX ugly hack: nonblock is only set by the server */ |
233 | if (nonblock && isatty(c->rfd)) { | |
d7ac5f18 | 234 | debug2("channel %d: rfd %d isatty", c->self, c->rfd); |
0ae4fe1d | 235 | c->isatty = 1; |
236 | if (!isatty(c->wfd)) { | |
94dfb550 | 237 | error("channel %d: wfd %d is not a tty?", |
0ae4fe1d | 238 | c->self, c->wfd); |
239 | } | |
240 | } else { | |
241 | c->isatty = 0; | |
242 | } | |
21c2c5cd | 243 | c->wfd_isatty = isatty(c->wfd); |
0ae4fe1d | 244 | |
a22aff1f | 245 | /* enable nonblocking mode */ |
246 | if (nonblock) { | |
247 | if (rfd != -1) | |
248 | set_nonblock(rfd); | |
249 | if (wfd != -1) | |
250 | set_nonblock(wfd); | |
251 | if (efd != -1) | |
252 | set_nonblock(efd); | |
253 | } | |
0fbe8c74 | 254 | } |
255 | ||
256 | /* | |
257 | * Allocate a new channel object and set its type and socket. This will cause | |
258 | * remote_name to be freed. | |
259 | */ | |
719fc62f | 260 | Channel * |
0fbe8c74 | 261 | channel_new(char *ctype, int type, int rfd, int wfd, int efd, |
f91d9a89 | 262 | u_int window, u_int maxpack, int extusage, char *remote_name, int nonblock) |
0fbe8c74 | 263 | { |
9a995072 | 264 | int found; |
265 | u_int i; | |
0fbe8c74 | 266 | Channel *c; |
5260325f | 267 | |
268 | /* Do initial allocation if this is the first call. */ | |
269 | if (channels_alloc == 0) { | |
270 | channels_alloc = 10; | |
52e3daed | 271 | channels = xcalloc(channels_alloc, sizeof(Channel *)); |
5260325f | 272 | for (i = 0; i < channels_alloc; i++) |
719fc62f | 273 | channels[i] = NULL; |
5260325f | 274 | } |
275 | /* Try to find a free slot where to put the new channel. */ | |
276 | for (found = -1, i = 0; i < channels_alloc; i++) | |
719fc62f | 277 | if (channels[i] == NULL) { |
5260325f | 278 | /* Found a free slot. */ |
9a995072 | 279 | found = (int)i; |
5260325f | 280 | break; |
281 | } | |
9a995072 | 282 | if (found < 0) { |
aa3378df | 283 | /* There are no free slots. Take last+1 slot and expand the array. */ |
5260325f | 284 | found = channels_alloc; |
5df8c731 | 285 | if (channels_alloc > 10000) |
286 | fatal("channel_new: internal error: channels_alloc %d " | |
287 | "too big.", channels_alloc); | |
c5d10563 | 288 | channels = xrealloc(channels, channels_alloc + 10, |
289 | sizeof(Channel *)); | |
20419cc1 | 290 | channels_alloc += 10; |
de273eef | 291 | debug2("channel: expanding %d", channels_alloc); |
5260325f | 292 | for (i = found; i < channels_alloc; i++) |
719fc62f | 293 | channels[i] = NULL; |
5260325f | 294 | } |
719fc62f | 295 | /* Initialize and return new channel. */ |
52e3daed | 296 | c = channels[found] = xcalloc(1, sizeof(Channel)); |
5260325f | 297 | buffer_init(&c->input); |
298 | buffer_init(&c->output); | |
7368a6c8 | 299 | buffer_init(&c->extended); |
70bef40e | 300 | c->ostate = CHAN_OUTPUT_OPEN; |
301 | c->istate = CHAN_INPUT_OPEN; | |
302 | c->flags = 0; | |
a22aff1f | 303 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock); |
5260325f | 304 | c->self = found; |
305 | c->type = type; | |
7368a6c8 | 306 | c->ctype = ctype; |
0b242b12 | 307 | c->local_window = window; |
308 | c->local_window_max = window; | |
309 | c->local_consumed = 0; | |
310 | c->local_maxpacket = maxpack; | |
5260325f | 311 | c->remote_id = -1; |
0d942eff | 312 | c->remote_name = xstrdup(remote_name); |
7368a6c8 | 313 | c->remote_window = 0; |
314 | c->remote_maxpacket = 0; | |
a5f82435 | 315 | c->force_drain = 0; |
ac151b18 | 316 | c->single_connection = 0; |
3cf2be58 | 317 | c->detach_user = NULL; |
8cd0437d | 318 | c->detach_close = 0; |
05ca0898 | 319 | c->confirm = NULL; |
5e96b616 | 320 | c->confirm_ctx = NULL; |
2e73a022 | 321 | c->input_filter = NULL; |
c1c6a032 | 322 | c->output_filter = NULL; |
5260325f | 323 | debug("channel %d: new [%s]", found, remote_name); |
719fc62f | 324 | return c; |
7368a6c8 | 325 | } |
8efc0c15 | 326 | |
489aa2e9 | 327 | static int |
328 | channel_find_maxfd(void) | |
329 | { | |
9a995072 | 330 | u_int i; |
331 | int max = 0; | |
489aa2e9 | 332 | Channel *c; |
333 | ||
334 | for (i = 0; i < channels_alloc; i++) { | |
335 | c = channels[i]; | |
336 | if (c != NULL) { | |
337 | max = MAX(max, c->rfd); | |
338 | max = MAX(max, c->wfd); | |
339 | max = MAX(max, c->efd); | |
340 | } | |
341 | } | |
342 | return max; | |
343 | } | |
344 | ||
345 | int | |
346 | channel_close_fd(int *fdp) | |
347 | { | |
348 | int ret = 0, fd = *fdp; | |
349 | ||
350 | if (fd != -1) { | |
351 | ret = close(fd); | |
352 | *fdp = -1; | |
353 | if (fd == channel_max_fd) | |
354 | channel_max_fd = channel_find_maxfd(); | |
355 | } | |
356 | return ret; | |
357 | } | |
358 | ||
0fbe8c74 | 359 | /* Close all channel fd/socket. */ |
396c147e | 360 | static void |
0fbe8c74 | 361 | channel_close_fds(Channel *c) |
362 | { | |
5e96b616 | 363 | debug3("channel %d: close_fds r %d w %d e %d c %d", |
364 | c->self, c->rfd, c->wfd, c->efd, c->ctl_fd); | |
6fd8622b | 365 | |
489aa2e9 | 366 | channel_close_fd(&c->sock); |
5e96b616 | 367 | channel_close_fd(&c->ctl_fd); |
489aa2e9 | 368 | channel_close_fd(&c->rfd); |
369 | channel_close_fd(&c->wfd); | |
370 | channel_close_fd(&c->efd); | |
0fbe8c74 | 371 | } |
372 | ||
8e7895b8 | 373 | /* Free the channel and close its fd/socket. */ |
8e7895b8 | 374 | void |
375 | channel_free(Channel *c) | |
376 | { | |
377 | char *s; | |
9a995072 | 378 | u_int i, n; |
8e7895b8 | 379 | |
380 | for (n = 0, i = 0; i < channels_alloc; i++) | |
381 | if (channels[i]) | |
382 | n++; | |
9a995072 | 383 | debug("channel %d: free: %s, nchannels %u", c->self, |
8e7895b8 | 384 | c->remote_name ? c->remote_name : "???", n); |
385 | ||
386 | s = channel_open_message(); | |
d7ac5f18 | 387 | debug3("channel %d: status: %s", c->self, s); |
8e7895b8 | 388 | xfree(s); |
389 | ||
8e7895b8 | 390 | if (c->sock != -1) |
391 | shutdown(c->sock, SHUT_RDWR); | |
5e96b616 | 392 | if (c->ctl_fd != -1) |
393 | shutdown(c->ctl_fd, SHUT_RDWR); | |
8e7895b8 | 394 | channel_close_fds(c); |
395 | buffer_free(&c->input); | |
396 | buffer_free(&c->output); | |
397 | buffer_free(&c->extended); | |
398 | if (c->remote_name) { | |
399 | xfree(c->remote_name); | |
400 | c->remote_name = NULL; | |
401 | } | |
402 | channels[c->self] = NULL; | |
403 | xfree(c); | |
404 | } | |
405 | ||
8e7895b8 | 406 | void |
d6746a0b | 407 | channel_free_all(void) |
8e7895b8 | 408 | { |
9a995072 | 409 | u_int i; |
8e7895b8 | 410 | |
d6746a0b | 411 | for (i = 0; i < channels_alloc; i++) |
412 | if (channels[i] != NULL) | |
413 | channel_free(channels[i]); | |
8e7895b8 | 414 | } |
415 | ||
416 | /* | |
417 | * Closes the sockets/fds of all channels. This is used to close extra file | |
418 | * descriptors after a fork. | |
419 | */ | |
8e7895b8 | 420 | void |
d5bb9418 | 421 | channel_close_all(void) |
8e7895b8 | 422 | { |
9a995072 | 423 | u_int i; |
8e7895b8 | 424 | |
425 | for (i = 0; i < channels_alloc; i++) | |
426 | if (channels[i] != NULL) | |
427 | channel_close_fds(channels[i]); | |
428 | } | |
429 | ||
3cf2be58 | 430 | /* |
431 | * Stop listening to channels. | |
432 | */ | |
3cf2be58 | 433 | void |
434 | channel_stop_listening(void) | |
435 | { | |
9a995072 | 436 | u_int i; |
3cf2be58 | 437 | Channel *c; |
438 | ||
439 | for (i = 0; i < channels_alloc; i++) { | |
440 | c = channels[i]; | |
441 | if (c != NULL) { | |
442 | switch (c->type) { | |
443 | case SSH_CHANNEL_AUTH_SOCKET: | |
444 | case SSH_CHANNEL_PORT_LISTENER: | |
445 | case SSH_CHANNEL_RPORT_LISTENER: | |
446 | case SSH_CHANNEL_X11_LISTENER: | |
489aa2e9 | 447 | channel_close_fd(&c->sock); |
3cf2be58 | 448 | channel_free(c); |
449 | break; | |
450 | } | |
451 | } | |
452 | } | |
453 | } | |
454 | ||
8e7895b8 | 455 | /* |
456 | * Returns true if no channel has too much buffered data, and false if one or | |
457 | * more channel is overfull. | |
458 | */ | |
8e7895b8 | 459 | int |
d5bb9418 | 460 | channel_not_very_much_buffered_data(void) |
8e7895b8 | 461 | { |
462 | u_int i; | |
463 | Channel *c; | |
464 | ||
465 | for (i = 0; i < channels_alloc; i++) { | |
466 | c = channels[i]; | |
467 | if (c != NULL && c->type == SSH_CHANNEL_OPEN) { | |
0c139bd1 | 468 | #if 0 |
469 | if (!compat20 && | |
470 | buffer_len(&c->input) > packet_get_maxsize()) { | |
faa483fa | 471 | debug2("channel %d: big input buffer %d", |
8e7895b8 | 472 | c->self, buffer_len(&c->input)); |
473 | return 0; | |
474 | } | |
0c139bd1 | 475 | #endif |
8e7895b8 | 476 | if (buffer_len(&c->output) > packet_get_maxsize()) { |
a27002e5 | 477 | debug2("channel %d: big output buffer %u > %u", |
0c139bd1 | 478 | c->self, buffer_len(&c->output), |
479 | packet_get_maxsize()); | |
8e7895b8 | 480 | return 0; |
481 | } | |
482 | } | |
483 | } | |
484 | return 1; | |
485 | } | |
486 | ||
487 | /* Returns true if any channel is still open. */ | |
8e7895b8 | 488 | int |
d5bb9418 | 489 | channel_still_open(void) |
8e7895b8 | 490 | { |
9a995072 | 491 | u_int i; |
8e7895b8 | 492 | Channel *c; |
493 | ||
494 | for (i = 0; i < channels_alloc; i++) { | |
495 | c = channels[i]; | |
496 | if (c == NULL) | |
497 | continue; | |
498 | switch (c->type) { | |
499 | case SSH_CHANNEL_X11_LISTENER: | |
500 | case SSH_CHANNEL_PORT_LISTENER: | |
501 | case SSH_CHANNEL_RPORT_LISTENER: | |
502 | case SSH_CHANNEL_CLOSED: | |
503 | case SSH_CHANNEL_AUTH_SOCKET: | |
504 | case SSH_CHANNEL_DYNAMIC: | |
505 | case SSH_CHANNEL_CONNECTING: | |
506 | case SSH_CHANNEL_ZOMBIE: | |
507 | continue; | |
508 | case SSH_CHANNEL_LARVAL: | |
509 | if (!compat20) | |
510 | fatal("cannot happen: SSH_CHANNEL_LARVAL"); | |
511 | continue; | |
512 | case SSH_CHANNEL_OPENING: | |
513 | case SSH_CHANNEL_OPEN: | |
514 | case SSH_CHANNEL_X11_OPEN: | |
515 | return 1; | |
516 | case SSH_CHANNEL_INPUT_DRAINING: | |
517 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
518 | if (!compat13) | |
519 | fatal("cannot happen: OUT_DRAIN"); | |
520 | return 1; | |
521 | default: | |
522 | fatal("channel_still_open: bad channel type %d", c->type); | |
523 | /* NOTREACHED */ | |
524 | } | |
525 | } | |
526 | return 0; | |
527 | } | |
528 | ||
529 | /* Returns the id of an open channel suitable for keepaliving */ | |
8e7895b8 | 530 | int |
d5bb9418 | 531 | channel_find_open(void) |
8e7895b8 | 532 | { |
9a995072 | 533 | u_int i; |
8e7895b8 | 534 | Channel *c; |
535 | ||
536 | for (i = 0; i < channels_alloc; i++) { | |
537 | c = channels[i]; | |
13de3560 | 538 | if (c == NULL || c->remote_id < 0) |
8e7895b8 | 539 | continue; |
540 | switch (c->type) { | |
541 | case SSH_CHANNEL_CLOSED: | |
542 | case SSH_CHANNEL_DYNAMIC: | |
543 | case SSH_CHANNEL_X11_LISTENER: | |
544 | case SSH_CHANNEL_PORT_LISTENER: | |
545 | case SSH_CHANNEL_RPORT_LISTENER: | |
546 | case SSH_CHANNEL_OPENING: | |
547 | case SSH_CHANNEL_CONNECTING: | |
548 | case SSH_CHANNEL_ZOMBIE: | |
549 | continue; | |
550 | case SSH_CHANNEL_LARVAL: | |
551 | case SSH_CHANNEL_AUTH_SOCKET: | |
552 | case SSH_CHANNEL_OPEN: | |
553 | case SSH_CHANNEL_X11_OPEN: | |
554 | return i; | |
555 | case SSH_CHANNEL_INPUT_DRAINING: | |
556 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
557 | if (!compat13) | |
558 | fatal("cannot happen: OUT_DRAIN"); | |
559 | return i; | |
560 | default: | |
561 | fatal("channel_find_open: bad channel type %d", c->type); | |
562 | /* NOTREACHED */ | |
563 | } | |
564 | } | |
565 | return -1; | |
566 | } | |
567 | ||
568 | ||
569 | /* | |
570 | * Returns a message describing the currently open forwarded connections, | |
571 | * suitable for sending to the client. The message contains crlf pairs for | |
572 | * newlines. | |
573 | */ | |
8e7895b8 | 574 | char * |
d5bb9418 | 575 | channel_open_message(void) |
8e7895b8 | 576 | { |
577 | Buffer buffer; | |
578 | Channel *c; | |
579 | char buf[1024], *cp; | |
9a995072 | 580 | u_int i; |
8e7895b8 | 581 | |
582 | buffer_init(&buffer); | |
583 | snprintf(buf, sizeof buf, "The following connections are open:\r\n"); | |
584 | buffer_append(&buffer, buf, strlen(buf)); | |
585 | for (i = 0; i < channels_alloc; i++) { | |
586 | c = channels[i]; | |
587 | if (c == NULL) | |
588 | continue; | |
589 | switch (c->type) { | |
590 | case SSH_CHANNEL_X11_LISTENER: | |
591 | case SSH_CHANNEL_PORT_LISTENER: | |
592 | case SSH_CHANNEL_RPORT_LISTENER: | |
593 | case SSH_CHANNEL_CLOSED: | |
594 | case SSH_CHANNEL_AUTH_SOCKET: | |
595 | case SSH_CHANNEL_ZOMBIE: | |
596 | continue; | |
597 | case SSH_CHANNEL_LARVAL: | |
598 | case SSH_CHANNEL_OPENING: | |
599 | case SSH_CHANNEL_CONNECTING: | |
600 | case SSH_CHANNEL_DYNAMIC: | |
601 | case SSH_CHANNEL_OPEN: | |
602 | case SSH_CHANNEL_X11_OPEN: | |
603 | case SSH_CHANNEL_INPUT_DRAINING: | |
604 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
5e96b616 | 605 | snprintf(buf, sizeof buf, |
606 | " #%d %.300s (t%d r%d i%d/%d o%d/%d fd %d/%d cfd %d)\r\n", | |
8e7895b8 | 607 | c->self, c->remote_name, |
608 | c->type, c->remote_id, | |
609 | c->istate, buffer_len(&c->input), | |
610 | c->ostate, buffer_len(&c->output), | |
5e96b616 | 611 | c->rfd, c->wfd, c->ctl_fd); |
8e7895b8 | 612 | buffer_append(&buffer, buf, strlen(buf)); |
613 | continue; | |
614 | default: | |
615 | fatal("channel_open_message: bad channel type %d", c->type); | |
616 | /* NOTREACHED */ | |
617 | } | |
618 | } | |
619 | buffer_append(&buffer, "\0", 1); | |
620 | cp = xstrdup(buffer_ptr(&buffer)); | |
621 | buffer_free(&buffer); | |
622 | return cp; | |
623 | } | |
624 | ||
625 | void | |
626 | channel_send_open(int id) | |
627 | { | |
628 | Channel *c = channel_lookup(id); | |
e1feb9bf | 629 | |
8e7895b8 | 630 | if (c == NULL) { |
bbe88b6d | 631 | logit("channel_send_open: %d: bad id", id); |
8e7895b8 | 632 | return; |
633 | } | |
6226a8f8 | 634 | debug2("channel %d: send open", id); |
8e7895b8 | 635 | packet_start(SSH2_MSG_CHANNEL_OPEN); |
636 | packet_put_cstring(c->ctype); | |
637 | packet_put_int(c->self); | |
638 | packet_put_int(c->local_window); | |
639 | packet_put_int(c->local_maxpacket); | |
640 | packet_send(); | |
641 | } | |
642 | ||
643 | void | |
6226a8f8 | 644 | channel_request_start(int id, char *service, int wantconfirm) |
8e7895b8 | 645 | { |
6226a8f8 | 646 | Channel *c = channel_lookup(id); |
e1feb9bf | 647 | |
8e7895b8 | 648 | if (c == NULL) { |
bbe88b6d | 649 | logit("channel_request_start: %d: unknown channel id", id); |
8e7895b8 | 650 | return; |
651 | } | |
5e96b616 | 652 | debug2("channel %d: request %s confirm %d", id, service, wantconfirm); |
8e7895b8 | 653 | packet_start(SSH2_MSG_CHANNEL_REQUEST); |
654 | packet_put_int(c->remote_id); | |
655 | packet_put_cstring(service); | |
656 | packet_put_char(wantconfirm); | |
657 | } | |
a7137f6b | 658 | |
8e7895b8 | 659 | void |
5e96b616 | 660 | channel_register_confirm(int id, channel_callback_fn *fn, void *ctx) |
8e7895b8 | 661 | { |
662 | Channel *c = channel_lookup(id); | |
e1feb9bf | 663 | |
8e7895b8 | 664 | if (c == NULL) { |
bbe88b6d | 665 | logit("channel_register_comfirm: %d: bad id", id); |
8e7895b8 | 666 | return; |
667 | } | |
05ca0898 | 668 | c->confirm = fn; |
5e96b616 | 669 | c->confirm_ctx = ctx; |
8e7895b8 | 670 | } |
a7137f6b | 671 | |
8e7895b8 | 672 | void |
8cd0437d | 673 | channel_register_cleanup(int id, channel_callback_fn *fn, int do_close) |
8e7895b8 | 674 | { |
b872f7f0 | 675 | Channel *c = channel_by_id(id); |
e1feb9bf | 676 | |
8e7895b8 | 677 | if (c == NULL) { |
bbe88b6d | 678 | logit("channel_register_cleanup: %d: bad id", id); |
8e7895b8 | 679 | return; |
680 | } | |
3cf2be58 | 681 | c->detach_user = fn; |
8cd0437d | 682 | c->detach_close = do_close; |
8e7895b8 | 683 | } |
a7137f6b | 684 | |
8e7895b8 | 685 | void |
686 | channel_cancel_cleanup(int id) | |
687 | { | |
b872f7f0 | 688 | Channel *c = channel_by_id(id); |
e1feb9bf | 689 | |
8e7895b8 | 690 | if (c == NULL) { |
bbe88b6d | 691 | logit("channel_cancel_cleanup: %d: bad id", id); |
8e7895b8 | 692 | return; |
693 | } | |
3cf2be58 | 694 | c->detach_user = NULL; |
8cd0437d | 695 | c->detach_close = 0; |
8e7895b8 | 696 | } |
a7137f6b | 697 | |
8e7895b8 | 698 | void |
c1c6a032 | 699 | channel_register_filter(int id, channel_infilter_fn *ifn, |
700 | channel_outfilter_fn *ofn) | |
8e7895b8 | 701 | { |
702 | Channel *c = channel_lookup(id); | |
e1feb9bf | 703 | |
8e7895b8 | 704 | if (c == NULL) { |
bbe88b6d | 705 | logit("channel_register_filter: %d: bad id", id); |
8e7895b8 | 706 | return; |
707 | } | |
c1c6a032 | 708 | c->input_filter = ifn; |
709 | c->output_filter = ofn; | |
8e7895b8 | 710 | } |
711 | ||
6ae2364d | 712 | void |
8e7895b8 | 713 | channel_set_fds(int id, int rfd, int wfd, int efd, |
399d1ea6 | 714 | int extusage, int nonblock, u_int window_max) |
8efc0c15 | 715 | { |
8e7895b8 | 716 | Channel *c = channel_lookup(id); |
e1feb9bf | 717 | |
8e7895b8 | 718 | if (c == NULL || c->type != SSH_CHANNEL_LARVAL) |
719 | fatal("channel_activate for non-larval channel %d.", id); | |
720 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock); | |
721 | c->type = SSH_CHANNEL_OPEN; | |
399d1ea6 | 722 | c->local_window = c->local_window_max = window_max; |
8e7895b8 | 723 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
724 | packet_put_int(c->remote_id); | |
725 | packet_put_int(c->local_window); | |
726 | packet_send(); | |
8efc0c15 | 727 | } |
728 | ||
aa3378df | 729 | /* |
7368a6c8 | 730 | * 'channel_pre*' are called just before select() to add any bits relevant to |
731 | * channels in the select bitmasks. | |
aa3378df | 732 | */ |
7368a6c8 | 733 | /* |
734 | * 'channel_post*': perform any appropriate operations for channels which | |
735 | * have events pending. | |
736 | */ | |
c8e9c167 | 737 | typedef void chan_fn(Channel *c, fd_set *readset, fd_set *writeset); |
7368a6c8 | 738 | chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE]; |
739 | chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE]; | |
8efc0c15 | 740 | |
ebb90778 | 741 | /* ARGSUSED */ |
396c147e | 742 | static void |
c8e9c167 | 743 | channel_pre_listener(Channel *c, fd_set *readset, fd_set *writeset) |
8efc0c15 | 744 | { |
7368a6c8 | 745 | FD_SET(c->sock, readset); |
746 | } | |
5260325f | 747 | |
ebb90778 | 748 | /* ARGSUSED */ |
396c147e | 749 | static void |
c8e9c167 | 750 | channel_pre_connecting(Channel *c, fd_set *readset, fd_set *writeset) |
97fb6912 | 751 | { |
752 | debug3("channel %d: waiting for connection", c->self); | |
753 | FD_SET(c->sock, writeset); | |
754 | } | |
755 | ||
396c147e | 756 | static void |
c8e9c167 | 757 | channel_pre_open_13(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 758 | { |
759 | if (buffer_len(&c->input) < packet_get_maxsize()) | |
760 | FD_SET(c->sock, readset); | |
761 | if (buffer_len(&c->output) > 0) | |
762 | FD_SET(c->sock, writeset); | |
763 | } | |
5260325f | 764 | |
396c147e | 765 | static void |
c8e9c167 | 766 | channel_pre_open(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 767 | { |
0c0738d5 | 768 | u_int limit = compat20 ? c->remote_window : packet_get_maxsize(); |
5260325f | 769 | |
7e7327a1 | 770 | if (c->istate == CHAN_INPUT_OPEN && |
0c0738d5 | 771 | limit > 0 && |
69d9d413 | 772 | buffer_len(&c->input) < limit && |
773 | buffer_check_alloc(&c->input, CHAN_RBUF)) | |
7e7327a1 | 774 | FD_SET(c->rfd, readset); |
775 | if (c->ostate == CHAN_OUTPUT_OPEN || | |
776 | c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { | |
777 | if (buffer_len(&c->output) > 0) { | |
778 | FD_SET(c->wfd, writeset); | |
779 | } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { | |
d2296ed7 | 780 | if (CHANNEL_EFD_OUTPUT_ACTIVE(c)) |
4e2e5cfd | 781 | debug2("channel %d: obuf_empty delayed efd %d/(%d)", |
782 | c->self, c->efd, buffer_len(&c->extended)); | |
d2296ed7 | 783 | else |
784 | chan_obuf_empty(c); | |
7e7327a1 | 785 | } |
786 | } | |
787 | /** XXX check close conditions, too */ | |
0c0738d5 | 788 | if (compat20 && c->efd != -1) { |
7e7327a1 | 789 | if (c->extended_usage == CHAN_EXTENDED_WRITE && |
790 | buffer_len(&c->extended) > 0) | |
791 | FD_SET(c->efd, writeset); | |
d2296ed7 | 792 | else if (!(c->flags & CHAN_EOF_SENT) && |
793 | c->extended_usage == CHAN_EXTENDED_READ && | |
7e7327a1 | 794 | buffer_len(&c->extended) < c->remote_window) |
795 | FD_SET(c->efd, readset); | |
796 | } | |
5e96b616 | 797 | /* XXX: What about efd? races? */ |
f2107e97 | 798 | if (compat20 && c->ctl_fd != -1 && |
5e96b616 | 799 | c->istate == CHAN_INPUT_OPEN && c->ostate == CHAN_OUTPUT_OPEN) |
800 | FD_SET(c->ctl_fd, readset); | |
7e7327a1 | 801 | } |
802 | ||
ebb90778 | 803 | /* ARGSUSED */ |
396c147e | 804 | static void |
c8e9c167 | 805 | channel_pre_input_draining(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 806 | { |
807 | if (buffer_len(&c->input) == 0) { | |
808 | packet_start(SSH_MSG_CHANNEL_CLOSE); | |
809 | packet_put_int(c->remote_id); | |
810 | packet_send(); | |
811 | c->type = SSH_CHANNEL_CLOSED; | |
d7ac5f18 | 812 | debug2("channel %d: closing after input drain.", c->self); |
7368a6c8 | 813 | } |
814 | } | |
5260325f | 815 | |
ebb90778 | 816 | /* ARGSUSED */ |
396c147e | 817 | static void |
c8e9c167 | 818 | channel_pre_output_draining(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 819 | { |
820 | if (buffer_len(&c->output) == 0) | |
719fc62f | 821 | chan_mark_dead(c); |
6ae2364d | 822 | else |
7368a6c8 | 823 | FD_SET(c->sock, writeset); |
824 | } | |
5260325f | 825 | |
7368a6c8 | 826 | /* |
827 | * This is a special state for X11 authentication spoofing. An opened X11 | |
828 | * connection (when authentication spoofing is being done) remains in this | |
829 | * state until the first packet has been completely read. The authentication | |
830 | * data in that packet is then substituted by the real data if it matches the | |
831 | * fake data, and the channel is put into normal mode. | |
0b242b12 | 832 | * XXX All this happens at the client side. |
8e7895b8 | 833 | * Returns: 0 = need more data, -1 = wrong cookie, 1 = ok |
7368a6c8 | 834 | */ |
396c147e | 835 | static int |
8e7895b8 | 836 | x11_open_helper(Buffer *b) |
7368a6c8 | 837 | { |
1e3b8b07 | 838 | u_char *ucp; |
839 | u_int proto_len, data_len; | |
5260325f | 840 | |
7368a6c8 | 841 | /* Check if the fixed size part of the packet is in buffer. */ |
8e7895b8 | 842 | if (buffer_len(b) < 12) |
7368a6c8 | 843 | return 0; |
844 | ||
845 | /* Parse the lengths of variable-length fields. */ | |
20905a8e | 846 | ucp = buffer_ptr(b); |
7368a6c8 | 847 | if (ucp[0] == 0x42) { /* Byte order MSB first. */ |
848 | proto_len = 256 * ucp[6] + ucp[7]; | |
849 | data_len = 256 * ucp[8] + ucp[9]; | |
850 | } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */ | |
851 | proto_len = ucp[6] + 256 * ucp[7]; | |
852 | data_len = ucp[8] + 256 * ucp[9]; | |
853 | } else { | |
d7ac5f18 | 854 | debug2("Initial X11 packet contains bad byte order byte: 0x%x", |
184eed6a | 855 | ucp[0]); |
7368a6c8 | 856 | return -1; |
857 | } | |
5260325f | 858 | |
7368a6c8 | 859 | /* Check if the whole packet is in buffer. */ |
8e7895b8 | 860 | if (buffer_len(b) < |
7368a6c8 | 861 | 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3)) |
862 | return 0; | |
5260325f | 863 | |
7368a6c8 | 864 | /* Check if authentication protocol matches. */ |
865 | if (proto_len != strlen(x11_saved_proto) || | |
866 | memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) { | |
d7ac5f18 | 867 | debug2("X11 connection uses different authentication protocol."); |
7368a6c8 | 868 | return -1; |
869 | } | |
870 | /* Check if authentication data matches our fake data. */ | |
871 | if (data_len != x11_fake_data_len || | |
872 | memcmp(ucp + 12 + ((proto_len + 3) & ~3), | |
873 | x11_fake_data, x11_fake_data_len) != 0) { | |
d7ac5f18 | 874 | debug2("X11 auth data does not match fake data."); |
7368a6c8 | 875 | return -1; |
876 | } | |
877 | /* Check fake data length */ | |
878 | if (x11_fake_data_len != x11_saved_data_len) { | |
879 | error("X11 fake_data_len %d != saved_data_len %d", | |
880 | x11_fake_data_len, x11_saved_data_len); | |
881 | return -1; | |
882 | } | |
883 | /* | |
884 | * Received authentication protocol and data match | |
885 | * our fake data. Substitute the fake data with real | |
886 | * data. | |
887 | */ | |
888 | memcpy(ucp + 12 + ((proto_len + 3) & ~3), | |
889 | x11_saved_data, x11_saved_data_len); | |
890 | return 1; | |
891 | } | |
5260325f | 892 | |
396c147e | 893 | static void |
c8e9c167 | 894 | channel_pre_x11_open_13(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 895 | { |
8e7895b8 | 896 | int ret = x11_open_helper(&c->output); |
e1feb9bf | 897 | |
7368a6c8 | 898 | if (ret == 1) { |
899 | /* Start normal processing for the channel. */ | |
900 | c->type = SSH_CHANNEL_OPEN; | |
a8be9f80 | 901 | channel_pre_open_13(c, readset, writeset); |
7368a6c8 | 902 | } else if (ret == -1) { |
903 | /* | |
904 | * We have received an X11 connection that has bad | |
905 | * authentication information. | |
906 | */ | |
bbe88b6d | 907 | logit("X11 connection rejected because of wrong authentication."); |
7368a6c8 | 908 | buffer_clear(&c->input); |
909 | buffer_clear(&c->output); | |
489aa2e9 | 910 | channel_close_fd(&c->sock); |
7368a6c8 | 911 | c->sock = -1; |
912 | c->type = SSH_CHANNEL_CLOSED; | |
913 | packet_start(SSH_MSG_CHANNEL_CLOSE); | |
914 | packet_put_int(c->remote_id); | |
915 | packet_send(); | |
916 | } | |
917 | } | |
5260325f | 918 | |
396c147e | 919 | static void |
c8e9c167 | 920 | channel_pre_x11_open(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 921 | { |
8e7895b8 | 922 | int ret = x11_open_helper(&c->output); |
a5f82435 | 923 | |
924 | /* c->force_drain = 1; */ | |
925 | ||
7368a6c8 | 926 | if (ret == 1) { |
927 | c->type = SSH_CHANNEL_OPEN; | |
0c0738d5 | 928 | channel_pre_open(c, readset, writeset); |
7368a6c8 | 929 | } else if (ret == -1) { |
bbe88b6d | 930 | logit("X11 connection rejected because of wrong authentication."); |
d7ac5f18 | 931 | debug2("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate); |
8341f420 | 932 | chan_read_failed(c); |
933 | buffer_clear(&c->input); | |
934 | chan_ibuf_empty(c); | |
935 | buffer_clear(&c->output); | |
936 | /* for proto v1, the peer will send an IEOF */ | |
937 | if (compat20) | |
938 | chan_write_failed(c); | |
939 | else | |
940 | c->type = SSH_CHANNEL_OPEN; | |
d7ac5f18 | 941 | debug2("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate); |
7368a6c8 | 942 | } |
943 | } | |
5260325f | 944 | |
28b9cb4d | 945 | /* try to decode a socks4 header */ |
ebb90778 | 946 | /* ARGSUSED */ |
396c147e | 947 | static int |
c8e9c167 | 948 | channel_decode_socks4(Channel *c, fd_set *readset, fd_set *writeset) |
0490e609 | 949 | { |
661e45a0 | 950 | char *p, *host; |
2ceb8101 | 951 | u_int len, have, i, found; |
184eed6a | 952 | char username[256]; |
0490e609 | 953 | struct { |
954 | u_int8_t version; | |
955 | u_int8_t command; | |
956 | u_int16_t dest_port; | |
28b9cb4d | 957 | struct in_addr dest_addr; |
0490e609 | 958 | } s4_req, s4_rsp; |
959 | ||
28b9cb4d | 960 | debug2("channel %d: decode socks4", c->self); |
53b8fe68 | 961 | |
962 | have = buffer_len(&c->input); | |
963 | len = sizeof(s4_req); | |
964 | if (have < len) | |
965 | return 0; | |
966 | p = buffer_ptr(&c->input); | |
967 | for (found = 0, i = len; i < have; i++) { | |
968 | if (p[i] == '\0') { | |
969 | found = 1; | |
970 | break; | |
971 | } | |
972 | if (i > 1024) { | |
973 | /* the peer is probably sending garbage */ | |
974 | debug("channel %d: decode socks4: too long", | |
975 | c->self); | |
976 | return -1; | |
977 | } | |
978 | } | |
979 | if (!found) | |
980 | return 0; | |
0490e609 | 981 | buffer_get(&c->input, (char *)&s4_req.version, 1); |
982 | buffer_get(&c->input, (char *)&s4_req.command, 1); | |
983 | buffer_get(&c->input, (char *)&s4_req.dest_port, 2); | |
28b9cb4d | 984 | buffer_get(&c->input, (char *)&s4_req.dest_addr, 4); |
53b8fe68 | 985 | have = buffer_len(&c->input); |
0490e609 | 986 | p = buffer_ptr(&c->input); |
987 | len = strlen(p); | |
6683b40f | 988 | debug2("channel %d: decode socks4: user %s/%d", c->self, p, len); |
0490e609 | 989 | if (len > have) |
28b9cb4d | 990 | fatal("channel %d: decode socks4: len %d > have %d", |
0490e609 | 991 | c->self, len, have); |
992 | strlcpy(username, p, sizeof(username)); | |
993 | buffer_consume(&c->input, len); | |
994 | buffer_consume(&c->input, 1); /* trailing '\0' */ | |
995 | ||
28b9cb4d | 996 | host = inet_ntoa(s4_req.dest_addr); |
0490e609 | 997 | strlcpy(c->path, host, sizeof(c->path)); |
998 | c->host_port = ntohs(s4_req.dest_port); | |
184eed6a | 999 | |
d7ac5f18 | 1000 | debug2("channel %d: dynamic request: socks4 host %s port %u command %u", |
6683b40f | 1001 | c->self, host, c->host_port, s4_req.command); |
0490e609 | 1002 | |
28b9cb4d | 1003 | if (s4_req.command != 1) { |
1004 | debug("channel %d: cannot handle: socks4 cn %d", | |
1005 | c->self, s4_req.command); | |
1006 | return -1; | |
0490e609 | 1007 | } |
28b9cb4d | 1008 | s4_rsp.version = 0; /* vn: 0 for reply */ |
1009 | s4_rsp.command = 90; /* cd: req granted */ | |
0490e609 | 1010 | s4_rsp.dest_port = 0; /* ignored */ |
28b9cb4d | 1011 | s4_rsp.dest_addr.s_addr = INADDR_ANY; /* ignored */ |
15dd2c4f | 1012 | buffer_append(&c->output, &s4_rsp, sizeof(s4_rsp)); |
28b9cb4d | 1013 | return 1; |
0490e609 | 1014 | } |
1015 | ||
f49658f5 | 1016 | /* try to decode a socks5 header */ |
1017 | #define SSH_SOCKS5_AUTHDONE 0x1000 | |
1018 | #define SSH_SOCKS5_NOAUTH 0x00 | |
1019 | #define SSH_SOCKS5_IPV4 0x01 | |
1020 | #define SSH_SOCKS5_DOMAIN 0x03 | |
1021 | #define SSH_SOCKS5_IPV6 0x04 | |
1022 | #define SSH_SOCKS5_CONNECT 0x01 | |
1023 | #define SSH_SOCKS5_SUCCESS 0x00 | |
1024 | ||
ebb90778 | 1025 | /* ARGSUSED */ |
f49658f5 | 1026 | static int |
c8e9c167 | 1027 | channel_decode_socks5(Channel *c, fd_set *readset, fd_set *writeset) |
f49658f5 | 1028 | { |
1029 | struct { | |
1030 | u_int8_t version; | |
1031 | u_int8_t command; | |
1032 | u_int8_t reserved; | |
1033 | u_int8_t atyp; | |
1034 | } s5_req, s5_rsp; | |
1035 | u_int16_t dest_port; | |
1036 | u_char *p, dest_addr[255+1]; | |
a217e418 | 1037 | u_int have, need, i, found, nmethods, addrlen, af; |
f49658f5 | 1038 | |
1039 | debug2("channel %d: decode socks5", c->self); | |
1040 | p = buffer_ptr(&c->input); | |
1041 | if (p[0] != 0x05) | |
1042 | return -1; | |
1043 | have = buffer_len(&c->input); | |
1044 | if (!(c->flags & SSH_SOCKS5_AUTHDONE)) { | |
1045 | /* format: ver | nmethods | methods */ | |
aff51935 | 1046 | if (have < 2) |
f49658f5 | 1047 | return 0; |
1048 | nmethods = p[1]; | |
1049 | if (have < nmethods + 2) | |
1050 | return 0; | |
1051 | /* look for method: "NO AUTHENTICATION REQUIRED" */ | |
1052 | for (found = 0, i = 2 ; i < nmethods + 2; i++) { | |
1053 | if (p[i] == SSH_SOCKS5_NOAUTH ) { | |
1054 | found = 1; | |
1055 | break; | |
1056 | } | |
1057 | } | |
1058 | if (!found) { | |
1059 | debug("channel %d: method SSH_SOCKS5_NOAUTH not found", | |
1060 | c->self); | |
1061 | return -1; | |
1062 | } | |
1063 | buffer_consume(&c->input, nmethods + 2); | |
1064 | buffer_put_char(&c->output, 0x05); /* version */ | |
1065 | buffer_put_char(&c->output, SSH_SOCKS5_NOAUTH); /* method */ | |
1066 | FD_SET(c->sock, writeset); | |
1067 | c->flags |= SSH_SOCKS5_AUTHDONE; | |
1068 | debug2("channel %d: socks5 auth done", c->self); | |
1069 | return 0; /* need more */ | |
1070 | } | |
1071 | debug2("channel %d: socks5 post auth", c->self); | |
1072 | if (have < sizeof(s5_req)+1) | |
1073 | return 0; /* need more */ | |
5b5f6af7 | 1074 | memcpy(&s5_req, p, sizeof(s5_req)); |
f49658f5 | 1075 | if (s5_req.version != 0x05 || |
1076 | s5_req.command != SSH_SOCKS5_CONNECT || | |
1077 | s5_req.reserved != 0x00) { | |
d7ac5f18 | 1078 | debug2("channel %d: only socks5 connect supported", c->self); |
f49658f5 | 1079 | return -1; |
1080 | } | |
f8cc7664 | 1081 | switch (s5_req.atyp){ |
f49658f5 | 1082 | case SSH_SOCKS5_IPV4: |
1083 | addrlen = 4; | |
1084 | af = AF_INET; | |
1085 | break; | |
1086 | case SSH_SOCKS5_DOMAIN: | |
1087 | addrlen = p[sizeof(s5_req)]; | |
1088 | af = -1; | |
1089 | break; | |
1090 | case SSH_SOCKS5_IPV6: | |
1091 | addrlen = 16; | |
1092 | af = AF_INET6; | |
1093 | break; | |
1094 | default: | |
d7ac5f18 | 1095 | debug2("channel %d: bad socks5 atyp %d", c->self, s5_req.atyp); |
f49658f5 | 1096 | return -1; |
1097 | } | |
a217e418 | 1098 | need = sizeof(s5_req) + addrlen + 2; |
1099 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) | |
1100 | need++; | |
1101 | if (have < need) | |
f49658f5 | 1102 | return 0; |
1103 | buffer_consume(&c->input, sizeof(s5_req)); | |
1104 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) | |
1105 | buffer_consume(&c->input, 1); /* host string length */ | |
1106 | buffer_get(&c->input, (char *)&dest_addr, addrlen); | |
1107 | buffer_get(&c->input, (char *)&dest_port, 2); | |
1108 | dest_addr[addrlen] = '\0'; | |
1109 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) | |
f6be21a0 | 1110 | strlcpy(c->path, (char *)dest_addr, sizeof(c->path)); |
f49658f5 | 1111 | else if (inet_ntop(af, dest_addr, c->path, sizeof(c->path)) == NULL) |
1112 | return -1; | |
1113 | c->host_port = ntohs(dest_port); | |
b6453d99 | 1114 | |
d7ac5f18 | 1115 | debug2("channel %d: dynamic request: socks5 host %s port %u command %u", |
f49658f5 | 1116 | c->self, c->path, c->host_port, s5_req.command); |
1117 | ||
1118 | s5_rsp.version = 0x05; | |
1119 | s5_rsp.command = SSH_SOCKS5_SUCCESS; | |
1120 | s5_rsp.reserved = 0; /* ignored */ | |
1121 | s5_rsp.atyp = SSH_SOCKS5_IPV4; | |
1122 | ((struct in_addr *)&dest_addr)->s_addr = INADDR_ANY; | |
1123 | dest_port = 0; /* ignored */ | |
1124 | ||
15dd2c4f | 1125 | buffer_append(&c->output, &s5_rsp, sizeof(s5_rsp)); |
1126 | buffer_append(&c->output, &dest_addr, sizeof(struct in_addr)); | |
1127 | buffer_append(&c->output, &dest_port, sizeof(dest_port)); | |
f49658f5 | 1128 | return 1; |
1129 | } | |
1130 | ||
28b9cb4d | 1131 | /* dynamic port forwarding */ |
396c147e | 1132 | static void |
c8e9c167 | 1133 | channel_pre_dynamic(Channel *c, fd_set *readset, fd_set *writeset) |
28b9cb4d | 1134 | { |
1135 | u_char *p; | |
2ceb8101 | 1136 | u_int have; |
1137 | int ret; | |
28b9cb4d | 1138 | |
1139 | have = buffer_len(&c->input); | |
639cb8ab | 1140 | c->delayed = 0; |
28b9cb4d | 1141 | debug2("channel %d: pre_dynamic: have %d", c->self, have); |
070adba2 | 1142 | /* buffer_dump(&c->input); */ |
28b9cb4d | 1143 | /* check if the fixed size part of the packet is in buffer. */ |
f49658f5 | 1144 | if (have < 3) { |
28b9cb4d | 1145 | /* need more */ |
1146 | FD_SET(c->sock, readset); | |
1147 | return; | |
1148 | } | |
1149 | /* try to guess the protocol */ | |
1150 | p = buffer_ptr(&c->input); | |
1151 | switch (p[0]) { | |
6683b40f | 1152 | case 0x04: |
1153 | ret = channel_decode_socks4(c, readset, writeset); | |
1154 | break; | |
f49658f5 | 1155 | case 0x05: |
1156 | ret = channel_decode_socks5(c, readset, writeset); | |
1157 | break; | |
28b9cb4d | 1158 | default: |
1159 | ret = -1; | |
1160 | break; | |
1161 | } | |
1162 | if (ret < 0) { | |
719fc62f | 1163 | chan_mark_dead(c); |
28b9cb4d | 1164 | } else if (ret == 0) { |
1165 | debug2("channel %d: pre_dynamic: need more", c->self); | |
1166 | /* need more */ | |
1167 | FD_SET(c->sock, readset); | |
1168 | } else { | |
1169 | /* switch to the next state */ | |
1170 | c->type = SSH_CHANNEL_OPENING; | |
1171 | port_open_helper(c, "direct-tcpip"); | |
1172 | } | |
1173 | } | |
0490e609 | 1174 | |
7368a6c8 | 1175 | /* This is our fake X11 server socket. */ |
ebb90778 | 1176 | /* ARGSUSED */ |
396c147e | 1177 | static void |
c8e9c167 | 1178 | channel_post_x11_listener(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1179 | { |
719fc62f | 1180 | Channel *nc; |
7368a6c8 | 1181 | struct sockaddr addr; |
bcc0381e | 1182 | int newsock; |
7368a6c8 | 1183 | socklen_t addrlen; |
865ac82e | 1184 | char buf[16384], *remote_ipaddr; |
0b242b12 | 1185 | int remote_port; |
7368a6c8 | 1186 | |
1187 | if (FD_ISSET(c->sock, readset)) { | |
1188 | debug("X11 connection requested."); | |
1189 | addrlen = sizeof(addr); | |
1190 | newsock = accept(c->sock, &addr, &addrlen); | |
ac151b18 | 1191 | if (c->single_connection) { |
d7ac5f18 | 1192 | debug2("single_connection: closing X11 listener."); |
ac151b18 | 1193 | channel_close_fd(&c->sock); |
1194 | chan_mark_dead(c); | |
1195 | } | |
7368a6c8 | 1196 | if (newsock < 0) { |
1197 | error("accept: %.100s", strerror(errno)); | |
1198 | return; | |
5260325f | 1199 | } |
bcc0381e | 1200 | set_nodelay(newsock); |
865ac82e | 1201 | remote_ipaddr = get_peer_ipaddr(newsock); |
0b242b12 | 1202 | remote_port = get_peer_port(newsock); |
7368a6c8 | 1203 | snprintf(buf, sizeof buf, "X11 connection from %.200s port %d", |
865ac82e | 1204 | remote_ipaddr, remote_port); |
0b242b12 | 1205 | |
719fc62f | 1206 | nc = channel_new("accepted x11 socket", |
0b242b12 | 1207 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
0d942eff | 1208 | c->local_window_max, c->local_maxpacket, 0, buf, 1); |
0b242b12 | 1209 | if (compat20) { |
1210 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1211 | packet_put_cstring("x11"); | |
719fc62f | 1212 | packet_put_int(nc->self); |
ac151b18 | 1213 | packet_put_int(nc->local_window_max); |
1214 | packet_put_int(nc->local_maxpacket); | |
865ac82e | 1215 | /* originator ipaddr and port */ |
1216 | packet_put_cstring(remote_ipaddr); | |
d0c832f3 | 1217 | if (datafellows & SSH_BUG_X11FWD) { |
d7ac5f18 | 1218 | debug2("ssh2 x11 bug compat mode"); |
d0c832f3 | 1219 | } else { |
1220 | packet_put_int(remote_port); | |
1221 | } | |
0b242b12 | 1222 | packet_send(); |
1223 | } else { | |
1224 | packet_start(SSH_SMSG_X11_OPEN); | |
719fc62f | 1225 | packet_put_int(nc->self); |
8e7895b8 | 1226 | if (packet_get_protocol_flags() & |
1227 | SSH_PROTOFLAG_HOST_IN_FWD_OPEN) | |
449c5ba5 | 1228 | packet_put_cstring(buf); |
0b242b12 | 1229 | packet_send(); |
1230 | } | |
865ac82e | 1231 | xfree(remote_ipaddr); |
8efc0c15 | 1232 | } |
8efc0c15 | 1233 | } |
1234 | ||
396c147e | 1235 | static void |
0490e609 | 1236 | port_open_helper(Channel *c, char *rtype) |
1237 | { | |
1238 | int direct; | |
1239 | char buf[1024]; | |
1240 | char *remote_ipaddr = get_peer_ipaddr(c->sock); | |
29798ed0 | 1241 | int remote_port = get_peer_port(c->sock); |
0490e609 | 1242 | |
1243 | direct = (strcmp(rtype, "direct-tcpip") == 0); | |
1244 | ||
1245 | snprintf(buf, sizeof buf, | |
1246 | "%s: listening port %d for %.100s port %d, " | |
1247 | "connect from %.200s port %d", | |
1248 | rtype, c->listening_port, c->path, c->host_port, | |
1249 | remote_ipaddr, remote_port); | |
1250 | ||
1251 | xfree(c->remote_name); | |
1252 | c->remote_name = xstrdup(buf); | |
1253 | ||
1254 | if (compat20) { | |
1255 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1256 | packet_put_cstring(rtype); | |
1257 | packet_put_int(c->self); | |
1258 | packet_put_int(c->local_window_max); | |
1259 | packet_put_int(c->local_maxpacket); | |
1260 | if (direct) { | |
1261 | /* target host, port */ | |
1262 | packet_put_cstring(c->path); | |
1263 | packet_put_int(c->host_port); | |
1264 | } else { | |
1265 | /* listen address, port */ | |
1266 | packet_put_cstring(c->path); | |
1267 | packet_put_int(c->listening_port); | |
1268 | } | |
1269 | /* originator host and port */ | |
1270 | packet_put_cstring(remote_ipaddr); | |
29798ed0 | 1271 | packet_put_int((u_int)remote_port); |
0490e609 | 1272 | packet_send(); |
1273 | } else { | |
1274 | packet_start(SSH_MSG_PORT_OPEN); | |
1275 | packet_put_int(c->self); | |
1276 | packet_put_cstring(c->path); | |
1277 | packet_put_int(c->host_port); | |
8e7895b8 | 1278 | if (packet_get_protocol_flags() & |
1279 | SSH_PROTOFLAG_HOST_IN_FWD_OPEN) | |
0490e609 | 1280 | packet_put_cstring(c->remote_name); |
1281 | packet_send(); | |
1282 | } | |
1283 | xfree(remote_ipaddr); | |
1284 | } | |
1285 | ||
442aee3a | 1286 | static void |
1287 | channel_set_reuseaddr(int fd) | |
1288 | { | |
1289 | int on = 1; | |
1290 | ||
1291 | /* | |
1292 | * Set socket options. | |
1293 | * Allow local port reuse in TIME_WAIT. | |
1294 | */ | |
1295 | if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1) | |
1296 | error("setsockopt SO_REUSEADDR fd %d: %s", fd, strerror(errno)); | |
1297 | } | |
1298 | ||
aa3378df | 1299 | /* |
7368a6c8 | 1300 | * This socket is listening for connections to a forwarded TCP/IP port. |
aa3378df | 1301 | */ |
ebb90778 | 1302 | /* ARGSUSED */ |
396c147e | 1303 | static void |
c8e9c167 | 1304 | channel_post_port_listener(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1305 | { |
0490e609 | 1306 | Channel *nc; |
7368a6c8 | 1307 | struct sockaddr addr; |
719fc62f | 1308 | int newsock, nextstate; |
7368a6c8 | 1309 | socklen_t addrlen; |
0490e609 | 1310 | char *rtype; |
fa08c86b | 1311 | |
7368a6c8 | 1312 | if (FD_ISSET(c->sock, readset)) { |
1313 | debug("Connection to port %d forwarding " | |
1314 | "to %.100s port %d requested.", | |
1315 | c->listening_port, c->path, c->host_port); | |
0490e609 | 1316 | |
639cb8ab | 1317 | if (c->type == SSH_CHANNEL_RPORT_LISTENER) { |
1318 | nextstate = SSH_CHANNEL_OPENING; | |
1319 | rtype = "forwarded-tcpip"; | |
1320 | } else { | |
1321 | if (c->host_port == 0) { | |
1322 | nextstate = SSH_CHANNEL_DYNAMIC; | |
f3964cb9 | 1323 | rtype = "dynamic-tcpip"; |
639cb8ab | 1324 | } else { |
1325 | nextstate = SSH_CHANNEL_OPENING; | |
1326 | rtype = "direct-tcpip"; | |
1327 | } | |
1328 | } | |
0490e609 | 1329 | |
7368a6c8 | 1330 | addrlen = sizeof(addr); |
1331 | newsock = accept(c->sock, &addr, &addrlen); | |
1332 | if (newsock < 0) { | |
1333 | error("accept: %.100s", strerror(errno)); | |
1334 | return; | |
1335 | } | |
811a6342 | 1336 | set_nodelay(newsock); |
0d942eff | 1337 | nc = channel_new(rtype, nextstate, newsock, newsock, -1, |
1338 | c->local_window_max, c->local_maxpacket, 0, rtype, 1); | |
0490e609 | 1339 | nc->listening_port = c->listening_port; |
1340 | nc->host_port = c->host_port; | |
1341 | strlcpy(nc->path, c->path, sizeof(nc->path)); | |
1342 | ||
639cb8ab | 1343 | if (nextstate == SSH_CHANNEL_DYNAMIC) { |
1344 | /* | |
1345 | * do not call the channel_post handler until | |
1346 | * this flag has been reset by a pre-handler. | |
1347 | * otherwise the FD_ISSET calls might overflow | |
1348 | */ | |
1349 | nc->delayed = 1; | |
1350 | } else { | |
0490e609 | 1351 | port_open_helper(nc, rtype); |
639cb8ab | 1352 | } |
7368a6c8 | 1353 | } |
1354 | } | |
8efc0c15 | 1355 | |
7368a6c8 | 1356 | /* |
1357 | * This is the authentication agent socket listening for connections from | |
1358 | * clients. | |
1359 | */ | |
ebb90778 | 1360 | /* ARGSUSED */ |
396c147e | 1361 | static void |
c8e9c167 | 1362 | channel_post_auth_listener(Channel *c, fd_set *readset, fd_set *writeset) |
8efc0c15 | 1363 | { |
719fc62f | 1364 | Channel *nc; |
1365 | int newsock; | |
5260325f | 1366 | struct sockaddr addr; |
48e671d5 | 1367 | socklen_t addrlen; |
5260325f | 1368 | |
7368a6c8 | 1369 | if (FD_ISSET(c->sock, readset)) { |
1370 | addrlen = sizeof(addr); | |
1371 | newsock = accept(c->sock, &addr, &addrlen); | |
1372 | if (newsock < 0) { | |
1373 | error("accept from auth socket: %.100s", strerror(errno)); | |
1374 | return; | |
1375 | } | |
719fc62f | 1376 | nc = channel_new("accepted auth socket", |
fa08c86b | 1377 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
1378 | c->local_window_max, c->local_maxpacket, | |
0d942eff | 1379 | 0, "accepted auth socket", 1); |
fa08c86b | 1380 | if (compat20) { |
1381 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
1382 | packet_put_cstring("auth-agent@openssh.com"); | |
719fc62f | 1383 | packet_put_int(nc->self); |
fa08c86b | 1384 | packet_put_int(c->local_window_max); |
1385 | packet_put_int(c->local_maxpacket); | |
1386 | } else { | |
1387 | packet_start(SSH_SMSG_AGENT_OPEN); | |
719fc62f | 1388 | packet_put_int(nc->self); |
fa08c86b | 1389 | } |
7368a6c8 | 1390 | packet_send(); |
1391 | } | |
1392 | } | |
5260325f | 1393 | |
ebb90778 | 1394 | /* ARGSUSED */ |
396c147e | 1395 | static void |
c8e9c167 | 1396 | channel_post_connecting(Channel *c, fd_set *readset, fd_set *writeset) |
97fb6912 | 1397 | { |
d18e0850 | 1398 | int err = 0; |
8ab2cb35 | 1399 | socklen_t sz = sizeof(err); |
d18e0850 | 1400 | |
97fb6912 | 1401 | if (FD_ISSET(c->sock, writeset)) { |
db518d9b | 1402 | if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, &err, &sz) < 0) { |
d18e0850 | 1403 | err = errno; |
1404 | error("getsockopt SO_ERROR failed"); | |
1405 | } | |
1406 | if (err == 0) { | |
1407 | debug("channel %d: connected", c->self); | |
1408 | c->type = SSH_CHANNEL_OPEN; | |
1409 | if (compat20) { | |
1410 | packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1411 | packet_put_int(c->remote_id); | |
1412 | packet_put_int(c->self); | |
1413 | packet_put_int(c->local_window); | |
1414 | packet_put_int(c->local_maxpacket); | |
1415 | } else { | |
1416 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1417 | packet_put_int(c->remote_id); | |
1418 | packet_put_int(c->self); | |
1419 | } | |
97fb6912 | 1420 | } else { |
d18e0850 | 1421 | debug("channel %d: not connected: %s", |
1422 | c->self, strerror(err)); | |
1423 | if (compat20) { | |
1424 | packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); | |
1425 | packet_put_int(c->remote_id); | |
1426 | packet_put_int(SSH2_OPEN_CONNECT_FAILED); | |
1427 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { | |
1428 | packet_put_cstring(strerror(err)); | |
1429 | packet_put_cstring(""); | |
1430 | } | |
97fb6912 | 1431 | } else { |
d18e0850 | 1432 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
1433 | packet_put_int(c->remote_id); | |
97fb6912 | 1434 | } |
d18e0850 | 1435 | chan_mark_dead(c); |
97fb6912 | 1436 | } |
d18e0850 | 1437 | packet_send(); |
97fb6912 | 1438 | } |
1439 | } | |
1440 | ||
ebb90778 | 1441 | /* ARGSUSED */ |
396c147e | 1442 | static int |
c8e9c167 | 1443 | channel_handle_rfd(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1444 | { |
fa1d7d85 | 1445 | char buf[CHAN_RBUF]; |
7368a6c8 | 1446 | int len; |
1447 | ||
6fd8622b | 1448 | if (c->rfd != -1 && |
7368a6c8 | 1449 | FD_ISSET(c->rfd, readset)) { |
ea8c44d9 | 1450 | errno = 0; |
7368a6c8 | 1451 | len = read(c->rfd, buf, sizeof(buf)); |
0fbe8c74 | 1452 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
1453 | return 1; | |
ea8c44d9 | 1454 | #ifndef PTY_ZEROREAD |
7368a6c8 | 1455 | if (len <= 0) { |
ea8c44d9 | 1456 | #else |
9c04d67d | 1457 | if ((!c->isatty && len <= 0) || |
1458 | (c->isatty && (len < 0 || (len == 0 && errno != 0)))) { | |
ea8c44d9 | 1459 | #endif |
d7ac5f18 | 1460 | debug2("channel %d: read<=0 rfd %d len %d", |
7368a6c8 | 1461 | c->self, c->rfd, len); |
28b9cb4d | 1462 | if (c->type != SSH_CHANNEL_OPEN) { |
d7ac5f18 | 1463 | debug2("channel %d: not open", c->self); |
719fc62f | 1464 | chan_mark_dead(c); |
0490e609 | 1465 | return -1; |
28b9cb4d | 1466 | } else if (compat13) { |
9c50edcf | 1467 | buffer_clear(&c->output); |
7368a6c8 | 1468 | c->type = SSH_CHANNEL_INPUT_DRAINING; |
d7ac5f18 | 1469 | debug2("channel %d: input draining.", c->self); |
7368a6c8 | 1470 | } else { |
1471 | chan_read_failed(c); | |
5260325f | 1472 | } |
7368a6c8 | 1473 | return -1; |
1474 | } | |
6aacefa7 | 1475 | if (c->input_filter != NULL) { |
2e73a022 | 1476 | if (c->input_filter(c, buf, len) == -1) { |
d7ac5f18 | 1477 | debug2("channel %d: filter stops", c->self); |
2e73a022 | 1478 | chan_read_failed(c); |
1479 | } | |
d20f3c9e | 1480 | } else if (c->datagram) { |
1481 | buffer_put_string(&c->input, buf, len); | |
2e73a022 | 1482 | } else { |
1483 | buffer_append(&c->input, buf, len); | |
1484 | } | |
7368a6c8 | 1485 | } |
1486 | return 1; | |
1487 | } | |
a7137f6b | 1488 | |
ebb90778 | 1489 | /* ARGSUSED */ |
396c147e | 1490 | static int |
c8e9c167 | 1491 | channel_handle_wfd(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1492 | { |
95ce5599 | 1493 | struct termios tio; |
c1c6a032 | 1494 | u_char *data = NULL, *buf; |
780a9951 | 1495 | u_int dlen; |
7368a6c8 | 1496 | int len; |
1497 | ||
1498 | /* Send buffered output data to the socket. */ | |
6fd8622b | 1499 | if (c->wfd != -1 && |
7368a6c8 | 1500 | FD_ISSET(c->wfd, writeset) && |
1501 | buffer_len(&c->output) > 0) { | |
c1c6a032 | 1502 | if (c->output_filter != NULL) { |
1503 | if ((buf = c->output_filter(c, &data, &dlen)) == NULL) { | |
1504 | debug2("channel %d: filter stops", c->self); | |
d7b37427 | 1505 | if (c->type != SSH_CHANNEL_OPEN) |
1506 | chan_mark_dead(c); | |
1507 | else | |
1508 | chan_write_failed(c); | |
1509 | return -1; | |
c1c6a032 | 1510 | } |
1511 | } else if (c->datagram) { | |
1512 | buf = data = buffer_get_string(&c->output, &dlen); | |
1513 | } else { | |
1514 | buf = data = buffer_ptr(&c->output); | |
1515 | dlen = buffer_len(&c->output); | |
1516 | } | |
1517 | ||
d20f3c9e | 1518 | if (c->datagram) { |
d20f3c9e | 1519 | /* ignore truncated writes, datagrams might get lost */ |
1520 | c->local_consumed += dlen + 4; | |
c1c6a032 | 1521 | len = write(c->wfd, buf, dlen); |
d20f3c9e | 1522 | xfree(data); |
1523 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) | |
1524 | return 1; | |
1525 | if (len <= 0) { | |
1526 | if (c->type != SSH_CHANNEL_OPEN) | |
1527 | chan_mark_dead(c); | |
1528 | else | |
1529 | chan_write_failed(c); | |
1530 | return -1; | |
1531 | } | |
1532 | return 1; | |
1533 | } | |
64c0ce80 | 1534 | #ifdef _AIX |
aff51935 | 1535 | /* XXX: Later AIX versions can't push as much data to tty */ |
7fbb4189 | 1536 | if (compat20 && c->wfd_isatty) |
1537 | dlen = MIN(dlen, 8*1024); | |
64c0ce80 | 1538 | #endif |
c1c6a032 | 1539 | |
1540 | len = write(c->wfd, buf, dlen); | |
0fbe8c74 | 1541 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
1542 | return 1; | |
7368a6c8 | 1543 | if (len <= 0) { |
28b9cb4d | 1544 | if (c->type != SSH_CHANNEL_OPEN) { |
d7ac5f18 | 1545 | debug2("channel %d: not open", c->self); |
719fc62f | 1546 | chan_mark_dead(c); |
28b9cb4d | 1547 | return -1; |
1548 | } else if (compat13) { | |
9c50edcf | 1549 | buffer_clear(&c->output); |
d7ac5f18 | 1550 | debug2("channel %d: input draining.", c->self); |
7368a6c8 | 1551 | c->type = SSH_CHANNEL_INPUT_DRAINING; |
1552 | } else { | |
1553 | chan_write_failed(c); | |
5260325f | 1554 | } |
7368a6c8 | 1555 | return -1; |
1556 | } | |
c1c6a032 | 1557 | if (compat20 && c->isatty && dlen >= 1 && buf[0] != '\r') { |
0ae4fe1d | 1558 | if (tcgetattr(c->wfd, &tio) == 0 && |
1559 | !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) { | |
1560 | /* | |
1561 | * Simulate echo to reduce the impact of | |
355724fc | 1562 | * traffic analysis. We need to match the |
95ce5599 | 1563 | * size of a SSH2_MSG_CHANNEL_DATA message |
c1c6a032 | 1564 | * (4 byte channel id + buf) |
0ae4fe1d | 1565 | */ |
95ce5599 | 1566 | packet_send_ignore(4 + len); |
0ae4fe1d | 1567 | packet_send(); |
0ae4fe1d | 1568 | } |
1569 | } | |
7368a6c8 | 1570 | buffer_consume(&c->output, len); |
7e7327a1 | 1571 | if (compat20 && len > 0) { |
1572 | c->local_consumed += len; | |
1573 | } | |
1574 | } | |
1575 | return 1; | |
1576 | } | |
a7137f6b | 1577 | |
396c147e | 1578 | static int |
c8e9c167 | 1579 | channel_handle_efd(Channel *c, fd_set *readset, fd_set *writeset) |
7e7327a1 | 1580 | { |
fa1d7d85 | 1581 | char buf[CHAN_RBUF]; |
7e7327a1 | 1582 | int len; |
1583 | ||
8ce64345 | 1584 | /** XXX handle drain efd, too */ |
7e7327a1 | 1585 | if (c->efd != -1) { |
1586 | if (c->extended_usage == CHAN_EXTENDED_WRITE && | |
1587 | FD_ISSET(c->efd, writeset) && | |
1588 | buffer_len(&c->extended) > 0) { | |
1589 | len = write(c->efd, buffer_ptr(&c->extended), | |
1590 | buffer_len(&c->extended)); | |
de273eef | 1591 | debug2("channel %d: written %d to efd %d", |
7e7327a1 | 1592 | c->self, len, c->efd); |
ee55dacf | 1593 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
1594 | return 1; | |
1595 | if (len <= 0) { | |
1596 | debug2("channel %d: closing write-efd %d", | |
1597 | c->self, c->efd); | |
489aa2e9 | 1598 | channel_close_fd(&c->efd); |
ee55dacf | 1599 | } else { |
7e7327a1 | 1600 | buffer_consume(&c->extended, len); |
1601 | c->local_consumed += len; | |
1602 | } | |
1603 | } else if (c->extended_usage == CHAN_EXTENDED_READ && | |
1604 | FD_ISSET(c->efd, readset)) { | |
1605 | len = read(c->efd, buf, sizeof(buf)); | |
de273eef | 1606 | debug2("channel %d: read %d from efd %d", |
184eed6a | 1607 | c->self, len, c->efd); |
ee55dacf | 1608 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
1609 | return 1; | |
1610 | if (len <= 0) { | |
1611 | debug2("channel %d: closing read-efd %d", | |
8ce64345 | 1612 | c->self, c->efd); |
489aa2e9 | 1613 | channel_close_fd(&c->efd); |
ee55dacf | 1614 | } else { |
7e7327a1 | 1615 | buffer_append(&c->extended, buf, len); |
ee55dacf | 1616 | } |
7e7327a1 | 1617 | } |
1618 | } | |
1619 | return 1; | |
1620 | } | |
a7137f6b | 1621 | |
ebb90778 | 1622 | /* ARGSUSED */ |
396c147e | 1623 | static int |
c8e9c167 | 1624 | channel_handle_ctl(Channel *c, fd_set *readset, fd_set *writeset) |
5e96b616 | 1625 | { |
1626 | char buf[16]; | |
1627 | int len; | |
1628 | ||
1629 | /* Monitor control fd to detect if the slave client exits */ | |
1630 | if (c->ctl_fd != -1 && FD_ISSET(c->ctl_fd, readset)) { | |
1631 | len = read(c->ctl_fd, buf, sizeof(buf)); | |
1632 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) | |
1633 | return 1; | |
1634 | if (len <= 0) { | |
1635 | debug2("channel %d: ctl read<=0", c->self); | |
1636 | if (c->type != SSH_CHANNEL_OPEN) { | |
1637 | debug2("channel %d: not open", c->self); | |
1638 | chan_mark_dead(c); | |
1639 | return -1; | |
1640 | } else { | |
1641 | chan_read_failed(c); | |
1642 | chan_write_failed(c); | |
1643 | } | |
1644 | return -1; | |
1645 | } else | |
1646 | fatal("%s: unexpected data on ctl fd", __func__); | |
1647 | } | |
1648 | return 1; | |
1649 | } | |
a7137f6b | 1650 | |
5e96b616 | 1651 | static int |
ee55dacf | 1652 | channel_check_window(Channel *c) |
7e7327a1 | 1653 | { |
28b9cb4d | 1654 | if (c->type == SSH_CHANNEL_OPEN && |
1655 | !(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) && | |
7e7327a1 | 1656 | c->local_window < c->local_window_max/2 && |
1657 | c->local_consumed > 0) { | |
1658 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); | |
1659 | packet_put_int(c->remote_id); | |
1660 | packet_put_int(c->local_consumed); | |
1661 | packet_send(); | |
de273eef | 1662 | debug2("channel %d: window %d sent adjust %d", |
7e7327a1 | 1663 | c->self, c->local_window, |
1664 | c->local_consumed); | |
1665 | c->local_window += c->local_consumed; | |
1666 | c->local_consumed = 0; | |
7368a6c8 | 1667 | } |
1668 | return 1; | |
1669 | } | |
5260325f | 1670 | |
396c147e | 1671 | static void |
c8e9c167 | 1672 | channel_post_open(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1673 | { |
639cb8ab | 1674 | if (c->delayed) |
1675 | return; | |
7368a6c8 | 1676 | channel_handle_rfd(c, readset, writeset); |
1677 | channel_handle_wfd(c, readset, writeset); | |
0c0738d5 | 1678 | if (!compat20) |
639cb8ab | 1679 | return; |
7e7327a1 | 1680 | channel_handle_efd(c, readset, writeset); |
5e96b616 | 1681 | channel_handle_ctl(c, readset, writeset); |
ee55dacf | 1682 | channel_check_window(c); |
7e7327a1 | 1683 | } |
1684 | ||
ebb90778 | 1685 | /* ARGSUSED */ |
396c147e | 1686 | static void |
c8e9c167 | 1687 | channel_post_output_drain_13(Channel *c, fd_set *readset, fd_set *writeset) |
7368a6c8 | 1688 | { |
1689 | int len; | |
e1feb9bf | 1690 | |
7368a6c8 | 1691 | /* Send buffered output data to the socket. */ |
1692 | if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) { | |
1693 | len = write(c->sock, buffer_ptr(&c->output), | |
1694 | buffer_len(&c->output)); | |
1695 | if (len <= 0) | |
9c50edcf | 1696 | buffer_clear(&c->output); |
7368a6c8 | 1697 | else |
1698 | buffer_consume(&c->output, len); | |
1699 | } | |
1700 | } | |
5260325f | 1701 | |
396c147e | 1702 | static void |
7e7327a1 | 1703 | channel_handler_init_20(void) |
1704 | { | |
0c0738d5 | 1705 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open; |
0b242b12 | 1706 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
7e7327a1 | 1707 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; |
fa08c86b | 1708 | channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener; |
0b242b12 | 1709 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
fa08c86b | 1710 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; |
97fb6912 | 1711 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1712 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7e7327a1 | 1713 | |
0c0738d5 | 1714 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
7e7327a1 | 1715 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; |
fa08c86b | 1716 | channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener; |
0b242b12 | 1717 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
fa08c86b | 1718 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; |
97fb6912 | 1719 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 1720 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
7e7327a1 | 1721 | } |
1722 | ||
396c147e | 1723 | static void |
7368a6c8 | 1724 | channel_handler_init_13(void) |
1725 | { | |
1726 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13; | |
1727 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_13; | |
1728 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; | |
1729 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; | |
1730 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; | |
1731 | channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining; | |
1732 | channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining; | |
97fb6912 | 1733 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1734 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7368a6c8 | 1735 | |
0c0738d5 | 1736 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
7368a6c8 | 1737 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
1738 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; | |
1739 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; | |
1740 | channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13; | |
97fb6912 | 1741 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 1742 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
7368a6c8 | 1743 | } |
5260325f | 1744 | |
396c147e | 1745 | static void |
7368a6c8 | 1746 | channel_handler_init_15(void) |
1747 | { | |
0c0738d5 | 1748 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open; |
0b242b12 | 1749 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
7368a6c8 | 1750 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
1751 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; | |
1752 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; | |
97fb6912 | 1753 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
0490e609 | 1754 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
7368a6c8 | 1755 | |
1756 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; | |
1757 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; | |
1758 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; | |
0c0738d5 | 1759 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
97fb6912 | 1760 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
0c0738d5 | 1761 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
7368a6c8 | 1762 | } |
1763 | ||
396c147e | 1764 | static void |
7368a6c8 | 1765 | channel_handler_init(void) |
1766 | { | |
1767 | int i; | |
e1feb9bf | 1768 | |
184eed6a | 1769 | for (i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) { |
7368a6c8 | 1770 | channel_pre[i] = NULL; |
1771 | channel_post[i] = NULL; | |
1772 | } | |
7e7327a1 | 1773 | if (compat20) |
1774 | channel_handler_init_20(); | |
1775 | else if (compat13) | |
7368a6c8 | 1776 | channel_handler_init_13(); |
1777 | else | |
1778 | channel_handler_init_15(); | |
1779 | } | |
1780 | ||
418e724c | 1781 | /* gc dead channels */ |
1782 | static void | |
1783 | channel_garbage_collect(Channel *c) | |
1784 | { | |
1785 | if (c == NULL) | |
1786 | return; | |
1787 | if (c->detach_user != NULL) { | |
8cd0437d | 1788 | if (!chan_is_dead(c, c->detach_close)) |
418e724c | 1789 | return; |
d7ac5f18 | 1790 | debug2("channel %d: gc: notify user", c->self); |
418e724c | 1791 | c->detach_user(c->self, NULL); |
1792 | /* if we still have a callback */ | |
1793 | if (c->detach_user != NULL) | |
1794 | return; | |
d7ac5f18 | 1795 | debug2("channel %d: gc: user detached", c->self); |
418e724c | 1796 | } |
1797 | if (!chan_is_dead(c, 1)) | |
1798 | return; | |
d7ac5f18 | 1799 | debug2("channel %d: garbage collecting", c->self); |
418e724c | 1800 | channel_free(c); |
1801 | } | |
1802 | ||
396c147e | 1803 | static void |
c8e9c167 | 1804 | channel_handler(chan_fn *ftab[], fd_set *readset, fd_set *writeset) |
7368a6c8 | 1805 | { |
1806 | static int did_init = 0; | |
9a995072 | 1807 | u_int i; |
7368a6c8 | 1808 | Channel *c; |
1809 | ||
1810 | if (!did_init) { | |
1811 | channel_handler_init(); | |
1812 | did_init = 1; | |
1813 | } | |
1814 | for (i = 0; i < channels_alloc; i++) { | |
719fc62f | 1815 | c = channels[i]; |
1816 | if (c == NULL) | |
5260325f | 1817 | continue; |
6fd8622b | 1818 | if (ftab[c->type] != NULL) |
1819 | (*ftab[c->type])(c, readset, writeset); | |
418e724c | 1820 | channel_garbage_collect(c); |
8efc0c15 | 1821 | } |
8efc0c15 | 1822 | } |
1823 | ||
8e7895b8 | 1824 | /* |
1825 | * Allocate/update select bitmasks and add any bits relevant to channels in | |
1826 | * select bitmasks. | |
1827 | */ | |
6ae2364d | 1828 | void |
c422989b | 1829 | channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp, |
9a995072 | 1830 | u_int *nallocp, int rekeying) |
7368a6c8 | 1831 | { |
c5d10563 | 1832 | u_int n, sz, nfdset; |
39929cdb | 1833 | |
1834 | n = MAX(*maxfdp, channel_max_fd); | |
1835 | ||
c5d10563 | 1836 | nfdset = howmany(n+1, NFDBITS); |
1837 | /* Explicitly test here, because xrealloc isn't always called */ | |
1838 | if (nfdset && SIZE_T_MAX / nfdset < sizeof(fd_mask)) | |
1839 | fatal("channel_prepare_select: max_fd (%d) is too large", n); | |
1840 | sz = nfdset * sizeof(fd_mask); | |
1841 | ||
489aa2e9 | 1842 | /* perhaps check sz < nalloc/2 and shrink? */ |
1843 | if (*readsetp == NULL || sz > *nallocp) { | |
c5d10563 | 1844 | *readsetp = xrealloc(*readsetp, nfdset, sizeof(fd_mask)); |
1845 | *writesetp = xrealloc(*writesetp, nfdset, sizeof(fd_mask)); | |
489aa2e9 | 1846 | *nallocp = sz; |
39929cdb | 1847 | } |
489aa2e9 | 1848 | *maxfdp = n; |
39929cdb | 1849 | memset(*readsetp, 0, sz); |
1850 | memset(*writesetp, 0, sz); | |
1851 | ||
c422989b | 1852 | if (!rekeying) |
1853 | channel_handler(channel_pre, *readsetp, *writesetp); | |
7368a6c8 | 1854 | } |
1855 | ||
8e7895b8 | 1856 | /* |
1857 | * After select, perform any appropriate operations for channels which have | |
1858 | * events pending. | |
1859 | */ | |
6ae2364d | 1860 | void |
c8e9c167 | 1861 | channel_after_select(fd_set *readset, fd_set *writeset) |
7368a6c8 | 1862 | { |
1863 | channel_handler(channel_post, readset, writeset); | |
1864 | } | |
1865 | ||
8e7895b8 | 1866 | |
39929cdb | 1867 | /* If there is data to send to the connection, enqueue some of it now. */ |
6ae2364d | 1868 | void |
d5bb9418 | 1869 | channel_output_poll(void) |
8efc0c15 | 1870 | { |
7368a6c8 | 1871 | Channel *c; |
9a995072 | 1872 | u_int i, len; |
5260325f | 1873 | |
1874 | for (i = 0; i < channels_alloc; i++) { | |
719fc62f | 1875 | c = channels[i]; |
1876 | if (c == NULL) | |
1877 | continue; | |
48e671d5 | 1878 | |
8e7895b8 | 1879 | /* |
1880 | * We are only interested in channels that can have buffered | |
1881 | * incoming data. | |
1882 | */ | |
48e671d5 | 1883 | if (compat13) { |
7368a6c8 | 1884 | if (c->type != SSH_CHANNEL_OPEN && |
1885 | c->type != SSH_CHANNEL_INPUT_DRAINING) | |
48e671d5 | 1886 | continue; |
1887 | } else { | |
7368a6c8 | 1888 | if (c->type != SSH_CHANNEL_OPEN) |
48e671d5 | 1889 | continue; |
48e671d5 | 1890 | } |
e78a59f5 | 1891 | if (compat20 && |
1892 | (c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) { | |
ee55dacf | 1893 | /* XXX is this true? */ |
418e724c | 1894 | debug3("channel %d: will not send data after close", c->self); |
7e7327a1 | 1895 | continue; |
1896 | } | |
5260325f | 1897 | |
1898 | /* Get the amount of buffered data for this channel. */ | |
ee55dacf | 1899 | if ((c->istate == CHAN_INPUT_OPEN || |
1900 | c->istate == CHAN_INPUT_WAIT_DRAIN) && | |
1901 | (len = buffer_len(&c->input)) > 0) { | |
d20f3c9e | 1902 | if (c->datagram) { |
1903 | if (len > 0) { | |
1904 | u_char *data; | |
1905 | u_int dlen; | |
1906 | ||
1907 | data = buffer_get_string(&c->input, | |
1908 | &dlen); | |
1909 | packet_start(SSH2_MSG_CHANNEL_DATA); | |
1910 | packet_put_int(c->remote_id); | |
1911 | packet_put_string(data, dlen); | |
1912 | packet_send(); | |
1913 | c->remote_window -= dlen + 4; | |
1914 | xfree(data); | |
1915 | } | |
1916 | continue; | |
1917 | } | |
8e7895b8 | 1918 | /* |
1919 | * Send some data for the other side over the secure | |
1920 | * connection. | |
1921 | */ | |
7e7327a1 | 1922 | if (compat20) { |
1923 | if (len > c->remote_window) | |
1924 | len = c->remote_window; | |
1925 | if (len > c->remote_maxpacket) | |
1926 | len = c->remote_maxpacket; | |
5260325f | 1927 | } else { |
7e7327a1 | 1928 | if (packet_is_interactive()) { |
1929 | if (len > 1024) | |
1930 | len = 512; | |
1931 | } else { | |
1932 | /* Keep the packets at reasonable size. */ | |
1933 | if (len > packet_get_maxsize()/2) | |
1934 | len = packet_get_maxsize()/2; | |
1935 | } | |
5260325f | 1936 | } |
7368a6c8 | 1937 | if (len > 0) { |
7e7327a1 | 1938 | packet_start(compat20 ? |
1939 | SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA); | |
7368a6c8 | 1940 | packet_put_int(c->remote_id); |
1941 | packet_put_string(buffer_ptr(&c->input), len); | |
1942 | packet_send(); | |
1943 | buffer_consume(&c->input, len); | |
1944 | c->remote_window -= len; | |
7368a6c8 | 1945 | } |
1946 | } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) { | |
5260325f | 1947 | if (compat13) |
1948 | fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3"); | |
aa3378df | 1949 | /* |
1950 | * input-buffer is empty and read-socket shutdown: | |
d2296ed7 | 1951 | * tell peer, that we will not send more data: send IEOF. |
1952 | * hack for extended data: delay EOF if EFD still in use. | |
aa3378df | 1953 | */ |
d2296ed7 | 1954 | if (CHANNEL_EFD_INPUT_ACTIVE(c)) |
4e2e5cfd | 1955 | debug2("channel %d: ibuf_empty delayed efd %d/(%d)", |
1956 | c->self, c->efd, buffer_len(&c->extended)); | |
d2296ed7 | 1957 | else |
1958 | chan_ibuf_empty(c); | |
5260325f | 1959 | } |
7e7327a1 | 1960 | /* Send extended data, i.e. stderr */ |
1961 | if (compat20 && | |
d2296ed7 | 1962 | !(c->flags & CHAN_EOF_SENT) && |
7e7327a1 | 1963 | c->remote_window > 0 && |
1964 | (len = buffer_len(&c->extended)) > 0 && | |
1965 | c->extended_usage == CHAN_EXTENDED_READ) { | |
f91d9a89 | 1966 | debug2("channel %d: rwin %u elen %u euse %d", |
ee55dacf | 1967 | c->self, c->remote_window, buffer_len(&c->extended), |
1968 | c->extended_usage); | |
7e7327a1 | 1969 | if (len > c->remote_window) |
1970 | len = c->remote_window; | |
1971 | if (len > c->remote_maxpacket) | |
1972 | len = c->remote_maxpacket; | |
1973 | packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA); | |
1974 | packet_put_int(c->remote_id); | |
1975 | packet_put_int(SSH2_EXTENDED_DATA_STDERR); | |
1976 | packet_put_string(buffer_ptr(&c->extended), len); | |
1977 | packet_send(); | |
1978 | buffer_consume(&c->extended, len); | |
1979 | c->remote_window -= len; | |
ee55dacf | 1980 | debug2("channel %d: sent ext data %d", c->self, len); |
7e7327a1 | 1981 | } |
8efc0c15 | 1982 | } |
8efc0c15 | 1983 | } |
1984 | ||
8e7895b8 | 1985 | |
1986 | /* -- protocol input */ | |
04aa9e67 | 1987 | |
1988 | /* ARGSUSED */ | |
6ae2364d | 1989 | void |
7819b5c3 | 1990 | channel_input_data(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 1991 | { |
48e671d5 | 1992 | int id; |
5260325f | 1993 | char *data; |
1e3b8b07 | 1994 | u_int data_len; |
7368a6c8 | 1995 | Channel *c; |
5260325f | 1996 | |
1997 | /* Get the channel number and verify it. */ | |
48e671d5 | 1998 | id = packet_get_int(); |
7368a6c8 | 1999 | c = channel_lookup(id); |
2000 | if (c == NULL) | |
48e671d5 | 2001 | packet_disconnect("Received data for nonexistent channel %d.", id); |
5260325f | 2002 | |
2003 | /* Ignore any data for non-open channels (might happen on close) */ | |
7368a6c8 | 2004 | if (c->type != SSH_CHANNEL_OPEN && |
2005 | c->type != SSH_CHANNEL_X11_OPEN) | |
48e671d5 | 2006 | return; |
2007 | ||
5260325f | 2008 | /* Get the data. */ |
2009 | data = packet_get_string(&data_len); | |
7368a6c8 | 2010 | |
7741e239 | 2011 | /* |
2012 | * Ignore data for protocol > 1.3 if output end is no longer open. | |
2013 | * For protocol 2 the sending side is reducing its window as it sends | |
2014 | * data, so we must 'fake' consumption of the data in order to ensure | |
2015 | * that window updates are sent back. Otherwise the connection might | |
2016 | * deadlock. | |
2017 | */ | |
2018 | if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN) { | |
2019 | if (compat20) { | |
2020 | c->local_window -= data_len; | |
2021 | c->local_consumed += data_len; | |
2022 | } | |
2023 | xfree(data); | |
2024 | return; | |
2025 | } | |
2026 | ||
6aacefa7 | 2027 | if (compat20) { |
7e7327a1 | 2028 | if (data_len > c->local_maxpacket) { |
bbe88b6d | 2029 | logit("channel %d: rcvd big packet %d, maxpack %d", |
7e7327a1 | 2030 | c->self, data_len, c->local_maxpacket); |
2031 | } | |
2032 | if (data_len > c->local_window) { | |
bbe88b6d | 2033 | logit("channel %d: rcvd too much data %d, win %d", |
7e7327a1 | 2034 | c->self, data_len, c->local_window); |
2035 | xfree(data); | |
2036 | return; | |
2037 | } | |
2038 | c->local_window -= data_len; | |
7e7327a1 | 2039 | } |
95500969 | 2040 | packet_check_eom(); |
d20f3c9e | 2041 | if (c->datagram) |
2042 | buffer_put_string(&c->output, data, data_len); | |
2043 | else | |
2044 | buffer_append(&c->output, data, data_len); | |
5260325f | 2045 | xfree(data); |
8efc0c15 | 2046 | } |
8e7895b8 | 2047 | |
04aa9e67 | 2048 | /* ARGSUSED */ |
6ae2364d | 2049 | void |
7819b5c3 | 2050 | channel_input_extended_data(int type, u_int32_t seq, void *ctxt) |
7e7327a1 | 2051 | { |
2052 | int id; | |
7e7327a1 | 2053 | char *data; |
a594fa74 | 2054 | u_int data_len, tcode; |
7e7327a1 | 2055 | Channel *c; |
2056 | ||
2057 | /* Get the channel number and verify it. */ | |
2058 | id = packet_get_int(); | |
2059 | c = channel_lookup(id); | |
2060 | ||
2061 | if (c == NULL) | |
2062 | packet_disconnect("Received extended_data for bad channel %d.", id); | |
2063 | if (c->type != SSH_CHANNEL_OPEN) { | |
bbe88b6d | 2064 | logit("channel %d: ext data for non open", id); |
7e7327a1 | 2065 | return; |
2066 | } | |
d2296ed7 | 2067 | if (c->flags & CHAN_EOF_RCVD) { |
2068 | if (datafellows & SSH_BUG_EXTEOF) | |
2069 | debug("channel %d: accepting ext data after eof", id); | |
2070 | else | |
2071 | packet_disconnect("Received extended_data after EOF " | |
2072 | "on channel %d.", id); | |
2073 | } | |
7e7327a1 | 2074 | tcode = packet_get_int(); |
2075 | if (c->efd == -1 || | |
2076 | c->extended_usage != CHAN_EXTENDED_WRITE || | |
2077 | tcode != SSH2_EXTENDED_DATA_STDERR) { | |
bbe88b6d | 2078 | logit("channel %d: bad ext data", c->self); |
7e7327a1 | 2079 | return; |
2080 | } | |
2081 | data = packet_get_string(&data_len); | |
95500969 | 2082 | packet_check_eom(); |
7e7327a1 | 2083 | if (data_len > c->local_window) { |
bbe88b6d | 2084 | logit("channel %d: rcvd too much extended_data %d, win %d", |
7e7327a1 | 2085 | c->self, data_len, c->local_window); |
2086 | xfree(data); | |
2087 | return; | |
2088 | } | |
de273eef | 2089 | debug2("channel %d: rcvd ext data %d", c->self, data_len); |
7e7327a1 | 2090 | c->local_window -= data_len; |
2091 | buffer_append(&c->extended, data, data_len); | |
2092 | xfree(data); | |
2093 | } | |
2094 | ||
04aa9e67 | 2095 | /* ARGSUSED */ |
6ae2364d | 2096 | void |
7819b5c3 | 2097 | channel_input_ieof(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 2098 | { |
2099 | int id; | |
2100 | Channel *c; | |
2101 | ||
7368a6c8 | 2102 | id = packet_get_int(); |
95500969 | 2103 | packet_check_eom(); |
7368a6c8 | 2104 | c = channel_lookup(id); |
2105 | if (c == NULL) | |
2106 | packet_disconnect("Received ieof for nonexistent channel %d.", id); | |
2107 | chan_rcvd_ieof(c); | |
a5f82435 | 2108 | |
2109 | /* XXX force input close */ | |
8341f420 | 2110 | if (c->force_drain && c->istate == CHAN_INPUT_OPEN) { |
a5f82435 | 2111 | debug("channel %d: FORCE input drain", c->self); |
2112 | c->istate = CHAN_INPUT_WAIT_DRAIN; | |
32e7d71f | 2113 | if (buffer_len(&c->input) == 0) |
2114 | chan_ibuf_empty(c); | |
a5f82435 | 2115 | } |
2116 | ||
7368a6c8 | 2117 | } |
8efc0c15 | 2118 | |
04aa9e67 | 2119 | /* ARGSUSED */ |
6ae2364d | 2120 | void |
7819b5c3 | 2121 | channel_input_close(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2122 | { |
7368a6c8 | 2123 | int id; |
2124 | Channel *c; | |
5260325f | 2125 | |
7368a6c8 | 2126 | id = packet_get_int(); |
95500969 | 2127 | packet_check_eom(); |
7368a6c8 | 2128 | c = channel_lookup(id); |
2129 | if (c == NULL) | |
2130 | packet_disconnect("Received close for nonexistent channel %d.", id); | |
aa3378df | 2131 | |
2132 | /* | |
2133 | * Send a confirmation that we have closed the channel and no more | |
2134 | * data is coming for it. | |
2135 | */ | |
5260325f | 2136 | packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION); |
7368a6c8 | 2137 | packet_put_int(c->remote_id); |
5260325f | 2138 | packet_send(); |
2139 | ||
aa3378df | 2140 | /* |
2141 | * If the channel is in closed state, we have sent a close request, | |
2142 | * and the other side will eventually respond with a confirmation. | |
2143 | * Thus, we cannot free the channel here, because then there would be | |
2144 | * no-one to receive the confirmation. The channel gets freed when | |
2145 | * the confirmation arrives. | |
2146 | */ | |
7368a6c8 | 2147 | if (c->type != SSH_CHANNEL_CLOSED) { |
aa3378df | 2148 | /* |
2149 | * Not a closed channel - mark it as draining, which will | |
2150 | * cause it to be freed later. | |
2151 | */ | |
9c50edcf | 2152 | buffer_clear(&c->input); |
7368a6c8 | 2153 | c->type = SSH_CHANNEL_OUTPUT_DRAINING; |
5260325f | 2154 | } |
8efc0c15 | 2155 | } |
2156 | ||
7368a6c8 | 2157 | /* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */ |
04aa9e67 | 2158 | /* ARGSUSED */ |
6ae2364d | 2159 | void |
7819b5c3 | 2160 | channel_input_oclose(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2161 | { |
7368a6c8 | 2162 | int id = packet_get_int(); |
2163 | Channel *c = channel_lookup(id); | |
a8a21a53 | 2164 | |
95500969 | 2165 | packet_check_eom(); |
7368a6c8 | 2166 | if (c == NULL) |
2167 | packet_disconnect("Received oclose for nonexistent channel %d.", id); | |
2168 | chan_rcvd_oclose(c); | |
8efc0c15 | 2169 | } |
2170 | ||
04aa9e67 | 2171 | /* ARGSUSED */ |
6ae2364d | 2172 | void |
7819b5c3 | 2173 | channel_input_close_confirmation(int type, u_int32_t seq, void *ctxt) |
7368a6c8 | 2174 | { |
2175 | int id = packet_get_int(); | |
2176 | Channel *c = channel_lookup(id); | |
2177 | ||
95500969 | 2178 | packet_check_eom(); |
7368a6c8 | 2179 | if (c == NULL) |
2180 | packet_disconnect("Received close confirmation for " | |
2181 | "out-of-range channel %d.", id); | |
2182 | if (c->type != SSH_CHANNEL_CLOSED) | |
2183 | packet_disconnect("Received close confirmation for " | |
2184 | "non-closed channel %d (type %d).", id, c->type); | |
719fc62f | 2185 | channel_free(c); |
7368a6c8 | 2186 | } |
8efc0c15 | 2187 | |
04aa9e67 | 2188 | /* ARGSUSED */ |
6ae2364d | 2189 | void |
7819b5c3 | 2190 | channel_input_open_confirmation(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2191 | { |
7368a6c8 | 2192 | int id, remote_id; |
2193 | Channel *c; | |
5260325f | 2194 | |
7368a6c8 | 2195 | id = packet_get_int(); |
2196 | c = channel_lookup(id); | |
5260325f | 2197 | |
7368a6c8 | 2198 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) |
2199 | packet_disconnect("Received open confirmation for " | |
2200 | "non-opening channel %d.", id); | |
2201 | remote_id = packet_get_int(); | |
aa3378df | 2202 | /* Record the remote channel number and mark that the channel is now open. */ |
7368a6c8 | 2203 | c->remote_id = remote_id; |
2204 | c->type = SSH_CHANNEL_OPEN; | |
7e7327a1 | 2205 | |
2206 | if (compat20) { | |
2207 | c->remote_window = packet_get_int(); | |
2208 | c->remote_maxpacket = packet_get_int(); | |
05ca0898 | 2209 | if (c->confirm) { |
de273eef | 2210 | debug2("callback start"); |
5e96b616 | 2211 | c->confirm(c->self, c->confirm_ctx); |
de273eef | 2212 | debug2("callback done"); |
7e7327a1 | 2213 | } |
d7ac5f18 | 2214 | debug2("channel %d: open confirm rwindow %u rmax %u", c->self, |
7e7327a1 | 2215 | c->remote_window, c->remote_maxpacket); |
2216 | } | |
95500969 | 2217 | packet_check_eom(); |
8efc0c15 | 2218 | } |
2219 | ||
396c147e | 2220 | static char * |
d18e0850 | 2221 | reason2txt(int reason) |
2222 | { | |
6aacefa7 | 2223 | switch (reason) { |
d18e0850 | 2224 | case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED: |
2225 | return "administratively prohibited"; | |
2226 | case SSH2_OPEN_CONNECT_FAILED: | |
2227 | return "connect failed"; | |
2228 | case SSH2_OPEN_UNKNOWN_CHANNEL_TYPE: | |
2229 | return "unknown channel type"; | |
2230 | case SSH2_OPEN_RESOURCE_SHORTAGE: | |
2231 | return "resource shortage"; | |
2232 | } | |
7e8c18e9 | 2233 | return "unknown reason"; |
d18e0850 | 2234 | } |
2235 | ||
04aa9e67 | 2236 | /* ARGSUSED */ |
6ae2364d | 2237 | void |
7819b5c3 | 2238 | channel_input_open_failure(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2239 | { |
02a024dd | 2240 | int id, reason; |
2241 | char *msg = NULL, *lang = NULL; | |
7368a6c8 | 2242 | Channel *c; |
5260325f | 2243 | |
7368a6c8 | 2244 | id = packet_get_int(); |
2245 | c = channel_lookup(id); | |
2246 | ||
2247 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) | |
2248 | packet_disconnect("Received open failure for " | |
2249 | "non-opening channel %d.", id); | |
7e7327a1 | 2250 | if (compat20) { |
02a024dd | 2251 | reason = packet_get_int(); |
fbe90f7b | 2252 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { |
02a024dd | 2253 | msg = packet_get_string(NULL); |
2254 | lang = packet_get_string(NULL); | |
2255 | } | |
bbe88b6d | 2256 | logit("channel %d: open failed: %s%s%s", id, |
d18e0850 | 2257 | reason2txt(reason), msg ? ": ": "", msg ? msg : ""); |
02a024dd | 2258 | if (msg != NULL) |
2259 | xfree(msg); | |
2260 | if (lang != NULL) | |
2261 | xfree(lang); | |
7e7327a1 | 2262 | } |
95500969 | 2263 | packet_check_eom(); |
5260325f | 2264 | /* Free the channel. This will also close the socket. */ |
719fc62f | 2265 | channel_free(c); |
8efc0c15 | 2266 | } |
2267 | ||
04aa9e67 | 2268 | /* ARGSUSED */ |
8e7895b8 | 2269 | void |
7819b5c3 | 2270 | channel_input_window_adjust(int type, u_int32_t seq, void *ctxt) |
8e7895b8 | 2271 | { |
2272 | Channel *c; | |
f91d9a89 | 2273 | int id; |
2274 | u_int adjust; | |
3ffc6336 | 2275 | |
8e7895b8 | 2276 | if (!compat20) |
2277 | return; | |
8efc0c15 | 2278 | |
8e7895b8 | 2279 | /* Get the channel number and verify it. */ |
2280 | id = packet_get_int(); | |
2281 | c = channel_lookup(id); | |
2282 | ||
b872f7f0 | 2283 | if (c == NULL) { |
2284 | logit("Received window adjust for non-open channel %d.", id); | |
8e7895b8 | 2285 | return; |
2286 | } | |
2287 | adjust = packet_get_int(); | |
95500969 | 2288 | packet_check_eom(); |
f91d9a89 | 2289 | debug2("channel %d: rcvd adjust %u", id, adjust); |
8e7895b8 | 2290 | c->remote_window += adjust; |
2291 | } | |
2292 | ||
04aa9e67 | 2293 | /* ARGSUSED */ |
8e7895b8 | 2294 | void |
7819b5c3 | 2295 | channel_input_port_open(int type, u_int32_t seq, void *ctxt) |
8efc0c15 | 2296 | { |
8e7895b8 | 2297 | Channel *c = NULL; |
2298 | u_short host_port; | |
2299 | char *host, *originator_string; | |
2300 | int remote_id, sock = -1; | |
5260325f | 2301 | |
8e7895b8 | 2302 | remote_id = packet_get_int(); |
2303 | host = packet_get_string(NULL); | |
2304 | host_port = packet_get_int(); | |
2305 | ||
2306 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) { | |
2307 | originator_string = packet_get_string(NULL); | |
2308 | } else { | |
2309 | originator_string = xstrdup("unknown (remote did not supply name)"); | |
2310 | } | |
95500969 | 2311 | packet_check_eom(); |
8e7895b8 | 2312 | sock = channel_connect_to(host, host_port); |
2313 | if (sock != -1) { | |
2314 | c = channel_new("connected socket", | |
2315 | SSH_CHANNEL_CONNECTING, sock, sock, -1, 0, 0, 0, | |
2316 | originator_string, 1); | |
3a0d3d54 | 2317 | c->remote_id = remote_id; |
5260325f | 2318 | } |
0d942eff | 2319 | xfree(originator_string); |
8e7895b8 | 2320 | if (c == NULL) { |
2321 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
2322 | packet_put_int(remote_id); | |
2323 | packet_send(); | |
2324 | } | |
2325 | xfree(host); | |
8efc0c15 | 2326 | } |
2327 | ||
8e7895b8 | 2328 | |
2329 | /* -- tcp forwarding */ | |
2330 | ||
5e4a7219 | 2331 | void |
2332 | channel_set_af(int af) | |
2333 | { | |
2334 | IPv4or6 = af; | |
2335 | } | |
2336 | ||
5641aefa | 2337 | static int |
2338 | channel_setup_fwd_listener(int type, const char *listen_addr, u_short listen_port, | |
2339 | const char *host_to_connect, u_short port_to_connect, int gateway_ports) | |
8efc0c15 | 2340 | { |
719fc62f | 2341 | Channel *c; |
442aee3a | 2342 | int sock, r, success = 0, wildcard = 0, is_client; |
48e671d5 | 2343 | struct addrinfo hints, *ai, *aitop; |
3867aa0a | 2344 | const char *host, *addr; |
5641aefa | 2345 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
5260325f | 2346 | |
5641aefa | 2347 | host = (type == SSH_CHANNEL_RPORT_LISTENER) ? |
2348 | listen_addr : host_to_connect; | |
3867aa0a | 2349 | is_client = (type == SSH_CHANNEL_PORT_LISTENER); |
02a024dd | 2350 | |
5641aefa | 2351 | if (host == NULL) { |
2352 | error("No forward host name."); | |
38946c65 | 2353 | return 0; |
fa08c86b | 2354 | } |
719fc62f | 2355 | if (strlen(host) > SSH_CHANNEL_PATH_LEN - 1) { |
02a024dd | 2356 | error("Forward host name too long."); |
38946c65 | 2357 | return 0; |
02a024dd | 2358 | } |
5260325f | 2359 | |
3867aa0a | 2360 | /* |
2361 | * Determine whether or not a port forward listens to loopback, | |
f8cc7664 | 2362 | * specified address or wildcard. On the client, a specified bind |
2363 | * address will always override gateway_ports. On the server, a | |
2364 | * gateway_ports of 1 (``yes'') will override the client's | |
2365 | * specification and force a wildcard bind, whereas a value of 2 | |
2366 | * (``clientspecified'') will bind to whatever address the client | |
3867aa0a | 2367 | * asked for. |
2368 | * | |
2369 | * Special-case listen_addrs are: | |
2370 | * | |
2371 | * "0.0.0.0" -> wildcard v4/v6 if SSH_OLD_FORWARD_ADDR | |
2372 | * "" (empty string), "*" -> wildcard v4/v6 | |
2373 | * "localhost" -> loopback v4/v6 | |
2374 | */ | |
2375 | addr = NULL; | |
2376 | if (listen_addr == NULL) { | |
2377 | /* No address specified: default to gateway_ports setting */ | |
2378 | if (gateway_ports) | |
2379 | wildcard = 1; | |
2380 | } else if (gateway_ports || is_client) { | |
2381 | if (((datafellows & SSH_OLD_FORWARD_ADDR) && | |
2382 | strcmp(listen_addr, "0.0.0.0") == 0) || | |
2383 | *listen_addr == '\0' || strcmp(listen_addr, "*") == 0 || | |
2384 | (!is_client && gateway_ports == 1)) | |
2385 | wildcard = 1; | |
2386 | else if (strcmp(listen_addr, "localhost") != 0) | |
2387 | addr = listen_addr; | |
2388 | } | |
2389 | ||
2390 | debug3("channel_setup_fwd_listener: type %d wildcard %d addr %s", | |
2391 | type, wildcard, (addr == NULL) ? "NULL" : addr); | |
2392 | ||
aa3378df | 2393 | /* |
48e671d5 | 2394 | * getaddrinfo returns a loopback address if the hostname is |
2395 | * set to NULL and hints.ai_flags is not AI_PASSIVE | |
aa3378df | 2396 | */ |
48e671d5 | 2397 | memset(&hints, 0, sizeof(hints)); |
2398 | hints.ai_family = IPv4or6; | |
3867aa0a | 2399 | hints.ai_flags = wildcard ? AI_PASSIVE : 0; |
48e671d5 | 2400 | hints.ai_socktype = SOCK_STREAM; |
fa08c86b | 2401 | snprintf(strport, sizeof strport, "%d", listen_port); |
3867aa0a | 2402 | if ((r = getaddrinfo(addr, strport, &hints, &aitop)) != 0) { |
2403 | if (addr == NULL) { | |
2404 | /* This really shouldn't happen */ | |
2405 | packet_disconnect("getaddrinfo: fatal error: %s", | |
2406 | gai_strerror(r)); | |
2407 | } else { | |
38946c65 | 2408 | error("channel_setup_fwd_listener: " |
3867aa0a | 2409 | "getaddrinfo(%.64s): %s", addr, gai_strerror(r)); |
2410 | } | |
38946c65 | 2411 | return 0; |
3867aa0a | 2412 | } |
48e671d5 | 2413 | |
48e671d5 | 2414 | for (ai = aitop; ai; ai = ai->ai_next) { |
2415 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
2416 | continue; | |
2417 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), | |
2418 | strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { | |
5641aefa | 2419 | error("channel_setup_fwd_listener: getnameinfo failed"); |
48e671d5 | 2420 | continue; |
2421 | } | |
2422 | /* Create a port to listen for the host. */ | |
3e131a6d | 2423 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
48e671d5 | 2424 | if (sock < 0) { |
2425 | /* this is no error since kernel may not support ipv6 */ | |
2426 | verbose("socket: %.100s", strerror(errno)); | |
2427 | continue; | |
2428 | } | |
442aee3a | 2429 | |
2430 | channel_set_reuseaddr(sock); | |
facfd613 | 2431 | |
48e671d5 | 2432 | debug("Local forwarding listening on %s port %s.", ntop, strport); |
2433 | ||
2434 | /* Bind the socket to the address. */ | |
2435 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { | |
2436 | /* address can be in use ipv6 address is already bound */ | |
16218745 | 2437 | if (!ai->ai_next) |
2438 | error("bind: %.100s", strerror(errno)); | |
2439 | else | |
2440 | verbose("bind: %.100s", strerror(errno)); | |
2b87da3b | 2441 | |
48e671d5 | 2442 | close(sock); |
2443 | continue; | |
2444 | } | |
2445 | /* Start listening for connections on the socket. */ | |
fce39749 | 2446 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { |
48e671d5 | 2447 | error("listen: %.100s", strerror(errno)); |
2448 | close(sock); | |
2449 | continue; | |
2450 | } | |
2451 | /* Allocate a channel number for the socket. */ | |
8e7895b8 | 2452 | c = channel_new("port listener", type, sock, sock, -1, |
0b242b12 | 2453 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, |
0d942eff | 2454 | 0, "port listener", 1); |
719fc62f | 2455 | strlcpy(c->path, host, sizeof(c->path)); |
2456 | c->host_port = port_to_connect; | |
2457 | c->listening_port = listen_port; | |
48e671d5 | 2458 | success = 1; |
2459 | } | |
2460 | if (success == 0) | |
5641aefa | 2461 | error("channel_setup_fwd_listener: cannot listen to port: %d", |
02a024dd | 2462 | listen_port); |
48e671d5 | 2463 | freeaddrinfo(aitop); |
02a024dd | 2464 | return success; |
5260325f | 2465 | } |
8efc0c15 | 2466 | |
d740ec16 | 2467 | int |
2468 | channel_cancel_rport_listener(const char *host, u_short port) | |
2469 | { | |
9a995072 | 2470 | u_int i; |
2471 | int found = 0; | |
d740ec16 | 2472 | |
f8cc7664 | 2473 | for (i = 0; i < channels_alloc; i++) { |
d740ec16 | 2474 | Channel *c = channels[i]; |
2475 | ||
2476 | if (c != NULL && c->type == SSH_CHANNEL_RPORT_LISTENER && | |
2477 | strncmp(c->path, host, sizeof(c->path)) == 0 && | |
f2107e97 | 2478 | c->listening_port == port) { |
2912cbd6 | 2479 | debug2("%s: close channel %d", __func__, i); |
d740ec16 | 2480 | channel_free(c); |
2481 | found = 1; | |
2482 | } | |
2483 | } | |
2484 | ||
2485 | return (found); | |
2486 | } | |
2487 | ||
5641aefa | 2488 | /* protocol local port fwd, used by ssh (and sshd in v1) */ |
2489 | int | |
3867aa0a | 2490 | channel_setup_local_fwd_listener(const char *listen_host, u_short listen_port, |
5641aefa | 2491 | const char *host_to_connect, u_short port_to_connect, int gateway_ports) |
2492 | { | |
2493 | return channel_setup_fwd_listener(SSH_CHANNEL_PORT_LISTENER, | |
3867aa0a | 2494 | listen_host, listen_port, host_to_connect, port_to_connect, |
2495 | gateway_ports); | |
5641aefa | 2496 | } |
2497 | ||
2498 | /* protocol v2 remote port fwd, used by sshd */ | |
2499 | int | |
2500 | channel_setup_remote_fwd_listener(const char *listen_address, | |
2501 | u_short listen_port, int gateway_ports) | |
2502 | { | |
2503 | return channel_setup_fwd_listener(SSH_CHANNEL_RPORT_LISTENER, | |
2504 | listen_address, listen_port, NULL, 0, gateway_ports); | |
2505 | } | |
2506 | ||
aa3378df | 2507 | /* |
2508 | * Initiate forwarding of connections to port "port" on remote host through | |
2509 | * the secure channel to host:port from local side. | |
2510 | */ | |
8efc0c15 | 2511 | |
42ea6f5e | 2512 | int |
3867aa0a | 2513 | channel_request_remote_forwarding(const char *listen_host, u_short listen_port, |
fa08c86b | 2514 | const char *host_to_connect, u_short port_to_connect) |
8efc0c15 | 2515 | { |
54a5250f | 2516 | int type, success = 0; |
fa08c86b | 2517 | |
5260325f | 2518 | /* Record locally that connection to this host/port is permitted. */ |
2519 | if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
2520 | fatal("channel_request_remote_forwarding: too many forwards"); | |
2521 | ||
5260325f | 2522 | /* Send the forward request to the remote side. */ |
7e7327a1 | 2523 | if (compat20) { |
3867aa0a | 2524 | const char *address_to_bind; |
2525 | if (listen_host == NULL) | |
2526 | address_to_bind = "localhost"; | |
2527 | else if (*listen_host == '\0' || strcmp(listen_host, "*") == 0) | |
2528 | address_to_bind = ""; | |
2529 | else | |
2530 | address_to_bind = listen_host; | |
2531 | ||
7e7327a1 | 2532 | packet_start(SSH2_MSG_GLOBAL_REQUEST); |
2533 | packet_put_cstring("tcpip-forward"); | |
e0ae8728 | 2534 | packet_put_char(1); /* boolean: want reply */ |
7e7327a1 | 2535 | packet_put_cstring(address_to_bind); |
2536 | packet_put_int(listen_port); | |
fa08c86b | 2537 | packet_send(); |
2538 | packet_write_wait(); | |
2539 | /* Assume that server accepts the request */ | |
2540 | success = 1; | |
7e7327a1 | 2541 | } else { |
2542 | packet_start(SSH_CMSG_PORT_FORWARD_REQUEST); | |
7e7327a1 | 2543 | packet_put_int(listen_port); |
d6f24e45 | 2544 | packet_put_cstring(host_to_connect); |
2545 | packet_put_int(port_to_connect); | |
7e7327a1 | 2546 | packet_send(); |
2547 | packet_write_wait(); | |
fa08c86b | 2548 | |
2549 | /* Wait for response from the remote side. */ | |
54a5250f | 2550 | type = packet_read(); |
fa08c86b | 2551 | switch (type) { |
2552 | case SSH_SMSG_SUCCESS: | |
2553 | success = 1; | |
2554 | break; | |
2555 | case SSH_SMSG_FAILURE: | |
fa08c86b | 2556 | break; |
2557 | default: | |
2558 | /* Unknown packet */ | |
2559 | packet_disconnect("Protocol error for port forward request:" | |
2560 | "received packet type %d.", type); | |
2561 | } | |
2562 | } | |
2563 | if (success) { | |
2564 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host_to_connect); | |
2565 | permitted_opens[num_permitted_opens].port_to_connect = port_to_connect; | |
2566 | permitted_opens[num_permitted_opens].listen_port = listen_port; | |
2567 | num_permitted_opens++; | |
7e7327a1 | 2568 | } |
42ea6f5e | 2569 | return (success ? 0 : -1); |
8efc0c15 | 2570 | } |
2571 | ||
d740ec16 | 2572 | /* |
f2107e97 | 2573 | * Request cancellation of remote forwarding of connection host:port from |
d740ec16 | 2574 | * local side. |
2575 | */ | |
d740ec16 | 2576 | void |
3867aa0a | 2577 | channel_request_rforward_cancel(const char *host, u_short port) |
d740ec16 | 2578 | { |
2579 | int i; | |
d740ec16 | 2580 | |
2581 | if (!compat20) | |
2582 | return; | |
2583 | ||
2584 | for (i = 0; i < num_permitted_opens; i++) { | |
f2107e97 | 2585 | if (permitted_opens[i].host_to_connect != NULL && |
d740ec16 | 2586 | permitted_opens[i].listen_port == port) |
2587 | break; | |
2588 | } | |
2589 | if (i >= num_permitted_opens) { | |
2590 | debug("%s: requested forward not found", __func__); | |
2591 | return; | |
2592 | } | |
2593 | packet_start(SSH2_MSG_GLOBAL_REQUEST); | |
2594 | packet_put_cstring("cancel-tcpip-forward"); | |
2595 | packet_put_char(0); | |
3867aa0a | 2596 | packet_put_cstring(host == NULL ? "" : host); |
d740ec16 | 2597 | packet_put_int(port); |
2598 | packet_send(); | |
2599 | ||
2600 | permitted_opens[i].listen_port = 0; | |
2601 | permitted_opens[i].port_to_connect = 0; | |
8c4bd764 | 2602 | xfree(permitted_opens[i].host_to_connect); |
d740ec16 | 2603 | permitted_opens[i].host_to_connect = NULL; |
2604 | } | |
2605 | ||
aa3378df | 2606 | /* |
2607 | * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates | |
2608 | * listening for the port, and sends back a success reply (or disconnect | |
42ea6f5e | 2609 | * message if there was an error). |
aa3378df | 2610 | */ |
42ea6f5e | 2611 | int |
1d1ffb87 | 2612 | channel_input_port_forward_request(int is_root, int gateway_ports) |
8efc0c15 | 2613 | { |
57112b5a | 2614 | u_short port, host_port; |
42ea6f5e | 2615 | int success = 0; |
5260325f | 2616 | char *hostname; |
2617 | ||
2618 | /* Get arguments from the packet. */ | |
2619 | port = packet_get_int(); | |
2620 | hostname = packet_get_string(NULL); | |
2621 | host_port = packet_get_int(); | |
2622 | ||
3c62e7eb | 2623 | #ifndef HAVE_CYGWIN |
aa3378df | 2624 | /* |
2625 | * Check that an unprivileged user is not trying to forward a | |
2626 | * privileged port. | |
2627 | */ | |
5260325f | 2628 | if (port < IPPORT_RESERVED && !is_root) |
8e7c9afc | 2629 | packet_disconnect( |
2630 | "Requested forwarding of port %d but user is not root.", | |
2631 | port); | |
2632 | if (host_port == 0) | |
2633 | packet_disconnect("Dynamic forwarding denied."); | |
3c62e7eb | 2634 | #endif |
8e7c9afc | 2635 | |
fa08c86b | 2636 | /* Initiate forwarding */ |
42ea6f5e | 2637 | success = channel_setup_local_fwd_listener(NULL, port, hostname, |
3867aa0a | 2638 | host_port, gateway_ports); |
5260325f | 2639 | |
2640 | /* Free the argument string. */ | |
2641 | xfree(hostname); | |
42ea6f5e | 2642 | |
2643 | return (success ? 0 : -1); | |
8efc0c15 | 2644 | } |
2645 | ||
01794848 | 2646 | /* |
2647 | * Permits opening to any host/port if permitted_opens[] is empty. This is | |
2648 | * usually called by the server, because the user could connect to any port | |
2649 | * anyway, and the server has no way to know but to trust the client anyway. | |
2650 | */ | |
2651 | void | |
d5bb9418 | 2652 | channel_permit_all_opens(void) |
01794848 | 2653 | { |
2654 | if (num_permitted_opens == 0) | |
2655 | all_opens_permitted = 1; | |
2656 | } | |
2657 | ||
cd332296 | 2658 | void |
01794848 | 2659 | channel_add_permitted_opens(char *host, int port) |
2660 | { | |
2661 | if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
42ea6f5e | 2662 | fatal("channel_add_permitted_opens: too many forwards"); |
01794848 | 2663 | debug("allow port forwarding to host %s port %d", host, port); |
2664 | ||
2665 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host); | |
2666 | permitted_opens[num_permitted_opens].port_to_connect = port; | |
2667 | num_permitted_opens++; | |
2668 | ||
2669 | all_opens_permitted = 0; | |
2670 | } | |
2671 | ||
ea46e550 | 2672 | int |
2fefbadf | 2673 | channel_add_adm_permitted_opens(char *host, int port) |
2674 | { | |
2675 | if (num_adm_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
2676 | fatal("channel_add_adm_permitted_opens: too many forwards"); | |
ea46e550 | 2677 | debug("config allows port forwarding to host %s port %d", host, port); |
2fefbadf | 2678 | |
2679 | permitted_adm_opens[num_adm_permitted_opens].host_to_connect | |
2680 | = xstrdup(host); | |
2681 | permitted_adm_opens[num_adm_permitted_opens].port_to_connect = port; | |
ea46e550 | 2682 | return ++num_adm_permitted_opens; |
2fefbadf | 2683 | } |
2684 | ||
cd332296 | 2685 | void |
01794848 | 2686 | channel_clear_permitted_opens(void) |
2687 | { | |
2688 | int i; | |
2689 | ||
2690 | for (i = 0; i < num_permitted_opens; i++) | |
d740ec16 | 2691 | if (permitted_opens[i].host_to_connect != NULL) |
2692 | xfree(permitted_opens[i].host_to_connect); | |
01794848 | 2693 | num_permitted_opens = 0; |
2fefbadf | 2694 | } |
2695 | ||
2696 | void | |
2697 | channel_clear_adm_permitted_opens(void) | |
2698 | { | |
2699 | int i; | |
01794848 | 2700 | |
2fefbadf | 2701 | for (i = 0; i < num_adm_permitted_opens; i++) |
2702 | if (permitted_adm_opens[i].host_to_connect != NULL) | |
2703 | xfree(permitted_adm_opens[i].host_to_connect); | |
2704 | num_adm_permitted_opens = 0; | |
01794848 | 2705 | } |
2706 | ||
01794848 | 2707 | /* return socket to remote host, port */ |
396c147e | 2708 | static int |
01794848 | 2709 | connect_to(const char *host, u_short port) |
8efc0c15 | 2710 | { |
48e671d5 | 2711 | struct addrinfo hints, *ai, *aitop; |
2712 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; | |
2713 | int gaierr; | |
7368a6c8 | 2714 | int sock = -1; |
48e671d5 | 2715 | |
2716 | memset(&hints, 0, sizeof(hints)); | |
2717 | hints.ai_family = IPv4or6; | |
2718 | hints.ai_socktype = SOCK_STREAM; | |
01794848 | 2719 | snprintf(strport, sizeof strport, "%d", port); |
48e671d5 | 2720 | if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) { |
01794848 | 2721 | error("connect_to %.100s: unknown host (%s)", host, |
2722 | gai_strerror(gaierr)); | |
7368a6c8 | 2723 | return -1; |
48e671d5 | 2724 | } |
48e671d5 | 2725 | for (ai = aitop; ai; ai = ai->ai_next) { |
2726 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
2727 | continue; | |
2728 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), | |
2729 | strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { | |
01794848 | 2730 | error("connect_to: getnameinfo failed"); |
48e671d5 | 2731 | continue; |
5260325f | 2732 | } |
3e131a6d | 2733 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
48e671d5 | 2734 | if (sock < 0) { |
4940c411 | 2735 | if (ai->ai_next == NULL) |
2736 | error("socket: %.100s", strerror(errno)); | |
2737 | else | |
2738 | verbose("socket: %.100s", strerror(errno)); | |
48e671d5 | 2739 | continue; |
5260325f | 2740 | } |
170694d7 | 2741 | if (set_nonblock(sock) == -1) |
2742 | fatal("%s: set_nonblock(%d)", __func__, sock); | |
97fb6912 | 2743 | if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0 && |
2744 | errno != EINPROGRESS) { | |
01794848 | 2745 | error("connect_to %.100s port %s: %.100s", ntop, strport, |
48e671d5 | 2746 | strerror(errno)); |
2747 | close(sock); | |
2b87da3b | 2748 | continue; /* fail -- try next */ |
48e671d5 | 2749 | } |
2750 | break; /* success */ | |
5260325f | 2751 | |
5260325f | 2752 | } |
48e671d5 | 2753 | freeaddrinfo(aitop); |
48e671d5 | 2754 | if (!ai) { |
01794848 | 2755 | error("connect_to %.100s port %d: failed.", host, port); |
7368a6c8 | 2756 | return -1; |
8efc0c15 | 2757 | } |
7368a6c8 | 2758 | /* success */ |
811a6342 | 2759 | set_nodelay(sock); |
7368a6c8 | 2760 | return sock; |
2761 | } | |
01794848 | 2762 | |
fa08c86b | 2763 | int |
b3f8a79c | 2764 | channel_connect_by_listen_address(u_short listen_port) |
fa08c86b | 2765 | { |
2766 | int i; | |
01794848 | 2767 | |
fa08c86b | 2768 | for (i = 0; i < num_permitted_opens; i++) |
d740ec16 | 2769 | if (permitted_opens[i].host_to_connect != NULL && |
2770 | permitted_opens[i].listen_port == listen_port) | |
01794848 | 2771 | return connect_to( |
fa08c86b | 2772 | permitted_opens[i].host_to_connect, |
2773 | permitted_opens[i].port_to_connect); | |
0b6fbf03 | 2774 | error("WARNING: Server requests forwarding for unknown listen_port %d", |
2775 | listen_port); | |
fa08c86b | 2776 | return -1; |
2777 | } | |
48e671d5 | 2778 | |
01794848 | 2779 | /* Check if connecting to that port is permitted and connect. */ |
2780 | int | |
2781 | channel_connect_to(const char *host, u_short port) | |
2782 | { | |
2fefbadf | 2783 | int i, permit, permit_adm = 1; |
01794848 | 2784 | |
2785 | permit = all_opens_permitted; | |
2786 | if (!permit) { | |
2787 | for (i = 0; i < num_permitted_opens; i++) | |
d740ec16 | 2788 | if (permitted_opens[i].host_to_connect != NULL && |
2789 | permitted_opens[i].port_to_connect == port && | |
01794848 | 2790 | strcmp(permitted_opens[i].host_to_connect, host) == 0) |
2791 | permit = 1; | |
2fefbadf | 2792 | } |
01794848 | 2793 | |
2fefbadf | 2794 | if (num_adm_permitted_opens > 0) { |
2795 | permit_adm = 0; | |
2796 | for (i = 0; i < num_adm_permitted_opens; i++) | |
2797 | if (permitted_adm_opens[i].host_to_connect != NULL && | |
2798 | permitted_adm_opens[i].port_to_connect == port && | |
2799 | strcmp(permitted_adm_opens[i].host_to_connect, host) | |
2800 | == 0) | |
2801 | permit_adm = 1; | |
01794848 | 2802 | } |
2fefbadf | 2803 | |
2804 | if (!permit || !permit_adm) { | |
bbe88b6d | 2805 | logit("Received request to connect to host %.100s port %d, " |
01794848 | 2806 | "but the request was denied.", host, port); |
2807 | return -1; | |
2808 | } | |
2809 | return connect_to(host, port); | |
2810 | } | |
2811 | ||
5e96b616 | 2812 | void |
2813 | channel_send_window_changes(void) | |
2814 | { | |
9a995072 | 2815 | u_int i; |
5e96b616 | 2816 | struct winsize ws; |
2817 | ||
2818 | for (i = 0; i < channels_alloc; i++) { | |
f8cc7664 | 2819 | if (channels[i] == NULL || !channels[i]->client_tty || |
5e96b616 | 2820 | channels[i]->type != SSH_CHANNEL_OPEN) |
2821 | continue; | |
2822 | if (ioctl(channels[i]->rfd, TIOCGWINSZ, &ws) < 0) | |
2823 | continue; | |
2824 | channel_request_start(i, "window-change", 0); | |
148de80c | 2825 | packet_put_int((u_int)ws.ws_col); |
2826 | packet_put_int((u_int)ws.ws_row); | |
2827 | packet_put_int((u_int)ws.ws_xpixel); | |
2828 | packet_put_int((u_int)ws.ws_ypixel); | |
5e96b616 | 2829 | packet_send(); |
2830 | } | |
2831 | } | |
2832 | ||
8e7895b8 | 2833 | /* -- X11 forwarding */ |
8efc0c15 | 2834 | |
aa3378df | 2835 | /* |
2836 | * Creates an internet domain socket for listening for X11 connections. | |
57f228e8 | 2837 | * Returns 0 and a suitable display number for the DISPLAY variable |
2838 | * stored in display_numberp , or -1 if an error occurs. | |
aa3378df | 2839 | */ |
c9d0ad9b | 2840 | int |
e6e573bd | 2841 | x11_create_display_inet(int x11_display_offset, int x11_use_localhost, |
d08341e6 | 2842 | int single_connection, u_int *display_numberp, int **chanids) |
8efc0c15 | 2843 | { |
ac151b18 | 2844 | Channel *nc = NULL; |
57112b5a | 2845 | int display_number, sock; |
2846 | u_short port; | |
48e671d5 | 2847 | struct addrinfo hints, *ai, *aitop; |
2848 | char strport[NI_MAXSERV]; | |
2849 | int gaierr, n, num_socks = 0, socks[NUM_SOCKS]; | |
5260325f | 2850 | |
59e5aff5 | 2851 | if (chanids == NULL) |
2852 | return -1; | |
2853 | ||
95f1eccc | 2854 | for (display_number = x11_display_offset; |
184eed6a | 2855 | display_number < MAX_DISPLAYS; |
2856 | display_number++) { | |
5260325f | 2857 | port = 6000 + display_number; |
48e671d5 | 2858 | memset(&hints, 0, sizeof(hints)); |
2859 | hints.ai_family = IPv4or6; | |
e6e573bd | 2860 | hints.ai_flags = x11_use_localhost ? 0: AI_PASSIVE; |
48e671d5 | 2861 | hints.ai_socktype = SOCK_STREAM; |
2862 | snprintf(strport, sizeof strport, "%d", port); | |
2863 | if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) { | |
2864 | error("getaddrinfo: %.100s", gai_strerror(gaierr)); | |
c9d0ad9b | 2865 | return -1; |
5260325f | 2866 | } |
48e671d5 | 2867 | for (ai = aitop; ai; ai = ai->ai_next) { |
2868 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
2869 | continue; | |
3e131a6d | 2870 | sock = socket(ai->ai_family, ai->ai_socktype, |
2871 | ai->ai_protocol); | |
48e671d5 | 2872 | if (sock < 0) { |
4ee81249 | 2873 | if ((errno != EINVAL) && (errno != EAFNOSUPPORT)) { |
80a44451 | 2874 | error("socket: %.100s", strerror(errno)); |
0ea89f7e | 2875 | freeaddrinfo(aitop); |
c9d0ad9b | 2876 | return -1; |
80a44451 | 2877 | } else { |
22d89d24 | 2878 | debug("x11_create_display_inet: Socket family %d not supported", |
2879 | ai->ai_family); | |
80a44451 | 2880 | continue; |
2881 | } | |
48e671d5 | 2882 | } |
688aaeda | 2883 | #ifdef IPV6_V6ONLY |
2884 | if (ai->ai_family == AF_INET6) { | |
2885 | int on = 1; | |
2886 | if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) < 0) | |
2887 | error("setsockopt IPV6_V6ONLY: %.100s", strerror(errno)); | |
2888 | } | |
2889 | #endif | |
442aee3a | 2890 | channel_set_reuseaddr(sock); |
48e671d5 | 2891 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { |
d7ac5f18 | 2892 | debug2("bind port %d: %.100s", port, strerror(errno)); |
48e671d5 | 2893 | close(sock); |
16218745 | 2894 | |
2895 | if (ai->ai_next) | |
2896 | continue; | |
2897 | ||
48e671d5 | 2898 | for (n = 0; n < num_socks; n++) { |
48e671d5 | 2899 | close(socks[n]); |
2900 | } | |
2901 | num_socks = 0; | |
2902 | break; | |
2903 | } | |
2904 | socks[num_socks++] = sock; | |
80faa19f | 2905 | #ifndef DONT_TRY_OTHER_AF |
48e671d5 | 2906 | if (num_socks == NUM_SOCKS) |
2907 | break; | |
80faa19f | 2908 | #else |
688aaeda | 2909 | if (x11_use_localhost) { |
2910 | if (num_socks == NUM_SOCKS) | |
2911 | break; | |
2912 | } else { | |
2913 | break; | |
2914 | } | |
80faa19f | 2915 | #endif |
5260325f | 2916 | } |
4ccb01d6 | 2917 | freeaddrinfo(aitop); |
48e671d5 | 2918 | if (num_socks > 0) |
2919 | break; | |
5260325f | 2920 | } |
2921 | if (display_number >= MAX_DISPLAYS) { | |
2922 | error("Failed to allocate internet-domain X11 display socket."); | |
c9d0ad9b | 2923 | return -1; |
8efc0c15 | 2924 | } |
5260325f | 2925 | /* Start listening for connections on the socket. */ |
48e671d5 | 2926 | for (n = 0; n < num_socks; n++) { |
2927 | sock = socks[n]; | |
fce39749 | 2928 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { |
48e671d5 | 2929 | error("listen: %.100s", strerror(errno)); |
48e671d5 | 2930 | close(sock); |
c9d0ad9b | 2931 | return -1; |
a7effaac | 2932 | } |
a7effaac | 2933 | } |
5260325f | 2934 | |
48e671d5 | 2935 | /* Allocate a channel for each socket. */ |
52e3daed | 2936 | *chanids = xcalloc(num_socks + 1, sizeof(**chanids)); |
48e671d5 | 2937 | for (n = 0; n < num_socks; n++) { |
2938 | sock = socks[n]; | |
ac151b18 | 2939 | nc = channel_new("x11 listener", |
0b242b12 | 2940 | SSH_CHANNEL_X11_LISTENER, sock, sock, -1, |
2941 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, | |
0d942eff | 2942 | 0, "X11 inet listener", 1); |
3a0d3d54 | 2943 | nc->single_connection = single_connection; |
59e5aff5 | 2944 | (*chanids)[n] = nc->self; |
48e671d5 | 2945 | } |
59e5aff5 | 2946 | (*chanids)[n] = -1; |
5260325f | 2947 | |
c9d0ad9b | 2948 | /* Return the display number for the DISPLAY environment variable. */ |
57f228e8 | 2949 | *display_numberp = display_number; |
2950 | return (0); | |
8efc0c15 | 2951 | } |
2952 | ||
396c147e | 2953 | static int |
1e3b8b07 | 2954 | connect_local_xsocket(u_int dnr) |
8efc0c15 | 2955 | { |
5260325f | 2956 | int sock; |
2957 | struct sockaddr_un addr; | |
5260325f | 2958 | |
805e659f | 2959 | sock = socket(AF_UNIX, SOCK_STREAM, 0); |
2960 | if (sock < 0) | |
2961 | error("socket: %.100s", strerror(errno)); | |
2962 | memset(&addr, 0, sizeof(addr)); | |
2963 | addr.sun_family = AF_UNIX; | |
2964 | snprintf(addr.sun_path, sizeof addr.sun_path, _PATH_UNIX_X, dnr); | |
32596c7b | 2965 | if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) == 0) |
805e659f | 2966 | return sock; |
2967 | close(sock); | |
5260325f | 2968 | error("connect %.100s: %.100s", addr.sun_path, strerror(errno)); |
2969 | return -1; | |
8efc0c15 | 2970 | } |
2971 | ||
0b242b12 | 2972 | int |
2973 | x11_connect_display(void) | |
8efc0c15 | 2974 | { |
4f16046f | 2975 | u_int display_number; |
5260325f | 2976 | const char *display; |
0b242b12 | 2977 | char buf[1024], *cp; |
48e671d5 | 2978 | struct addrinfo hints, *ai, *aitop; |
2979 | char strport[NI_MAXSERV]; | |
4f16046f | 2980 | int gaierr, sock = 0; |
5260325f | 2981 | |
5260325f | 2982 | /* Try to open a socket for the local X server. */ |
2983 | display = getenv("DISPLAY"); | |
2984 | if (!display) { | |
2985 | error("DISPLAY not set."); | |
0b242b12 | 2986 | return -1; |
5260325f | 2987 | } |
aa3378df | 2988 | /* |
2989 | * Now we decode the value of the DISPLAY variable and make a | |
2990 | * connection to the real X server. | |
2991 | */ | |
2992 | ||
2993 | /* | |
2994 | * Check if it is a unix domain socket. Unix domain displays are in | |
2995 | * one of the following formats: unix:d[.s], :d[.s], ::d[.s] | |
2996 | */ | |
5260325f | 2997 | if (strncmp(display, "unix:", 5) == 0 || |
2998 | display[0] == ':') { | |
2999 | /* Connect to the unix domain socket. */ | |
4f16046f | 3000 | if (sscanf(strrchr(display, ':') + 1, "%u", &display_number) != 1) { |
5260325f | 3001 | error("Could not parse display number from DISPLAY: %.100s", |
184eed6a | 3002 | display); |
0b242b12 | 3003 | return -1; |
5260325f | 3004 | } |
3005 | /* Create a socket. */ | |
3006 | sock = connect_local_xsocket(display_number); | |
3007 | if (sock < 0) | |
0b242b12 | 3008 | return -1; |
5260325f | 3009 | |
3010 | /* OK, we now have a connection to the display. */ | |
0b242b12 | 3011 | return sock; |
5260325f | 3012 | } |
aa3378df | 3013 | /* |
3014 | * Connect to an inet socket. The DISPLAY value is supposedly | |
3015 | * hostname:d[.s], where hostname may also be numeric IP address. | |
3016 | */ | |
74860245 | 3017 | strlcpy(buf, display, sizeof(buf)); |
5260325f | 3018 | cp = strchr(buf, ':'); |
3019 | if (!cp) { | |
3020 | error("Could not find ':' in DISPLAY: %.100s", display); | |
0b242b12 | 3021 | return -1; |
5260325f | 3022 | } |
3023 | *cp = 0; | |
aa3378df | 3024 | /* buf now contains the host name. But first we parse the display number. */ |
4f16046f | 3025 | if (sscanf(cp + 1, "%u", &display_number) != 1) { |
5260325f | 3026 | error("Could not parse display number from DISPLAY: %.100s", |
184eed6a | 3027 | display); |
0b242b12 | 3028 | return -1; |
5260325f | 3029 | } |
5260325f | 3030 | |
48e671d5 | 3031 | /* Look up the host address */ |
3032 | memset(&hints, 0, sizeof(hints)); | |
3033 | hints.ai_family = IPv4or6; | |
3034 | hints.ai_socktype = SOCK_STREAM; | |
4f16046f | 3035 | snprintf(strport, sizeof strport, "%u", 6000 + display_number); |
48e671d5 | 3036 | if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) { |
3037 | error("%.100s: unknown host. (%s)", buf, gai_strerror(gaierr)); | |
0b242b12 | 3038 | return -1; |
8efc0c15 | 3039 | } |
48e671d5 | 3040 | for (ai = aitop; ai; ai = ai->ai_next) { |
3041 | /* Create a socket. */ | |
3e131a6d | 3042 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
48e671d5 | 3043 | if (sock < 0) { |
d7ac5f18 | 3044 | debug2("socket: %.100s", strerror(errno)); |
7368a6c8 | 3045 | continue; |
3046 | } | |
3047 | /* Connect it to the display. */ | |
3048 | if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) { | |
4f16046f | 3049 | debug2("connect %.100s port %u: %.100s", buf, |
7368a6c8 | 3050 | 6000 + display_number, strerror(errno)); |
3051 | close(sock); | |
3052 | continue; | |
3053 | } | |
3054 | /* Success */ | |
3055 | break; | |
48e671d5 | 3056 | } |
48e671d5 | 3057 | freeaddrinfo(aitop); |
3058 | if (!ai) { | |
4f16046f | 3059 | error("connect %.100s port %u: %.100s", buf, 6000 + display_number, |
48e671d5 | 3060 | strerror(errno)); |
0b242b12 | 3061 | return -1; |
8efc0c15 | 3062 | } |
bcc0381e | 3063 | set_nodelay(sock); |
0b242b12 | 3064 | return sock; |
3065 | } | |
5260325f | 3066 | |
0b242b12 | 3067 | /* |
3068 | * This is called when SSH_SMSG_X11_OPEN is received. The packet contains | |
3069 | * the remote channel number. We should do whatever we want, and respond | |
3070 | * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE. | |
3071 | */ | |
5260325f | 3072 | |
ebb90778 | 3073 | /* ARGSUSED */ |
0b242b12 | 3074 | void |
7819b5c3 | 3075 | x11_input_open(int type, u_int32_t seq, void *ctxt) |
0b242b12 | 3076 | { |
719fc62f | 3077 | Channel *c = NULL; |
3078 | int remote_id, sock = 0; | |
0b242b12 | 3079 | char *remote_host; |
5260325f | 3080 | |
719fc62f | 3081 | debug("Received X11 open request."); |
5260325f | 3082 | |
719fc62f | 3083 | remote_id = packet_get_int(); |
8e7895b8 | 3084 | |
3085 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) { | |
719fc62f | 3086 | remote_host = packet_get_string(NULL); |
0b242b12 | 3087 | } else { |
3088 | remote_host = xstrdup("unknown (remote did not supply name)"); | |
0b242b12 | 3089 | } |
95500969 | 3090 | packet_check_eom(); |
0b242b12 | 3091 | |
3092 | /* Obtain a connection to the real X display. */ | |
3093 | sock = x11_connect_display(); | |
719fc62f | 3094 | if (sock != -1) { |
3095 | /* Allocate a channel for this connection. */ | |
3096 | c = channel_new("connected x11 socket", | |
3097 | SSH_CHANNEL_X11_OPEN, sock, sock, -1, 0, 0, 0, | |
3098 | remote_host, 1); | |
3a0d3d54 | 3099 | c->remote_id = remote_id; |
3100 | c->force_drain = 1; | |
719fc62f | 3101 | } |
0d942eff | 3102 | xfree(remote_host); |
719fc62f | 3103 | if (c == NULL) { |
0b242b12 | 3104 | /* Send refusal to the remote host. */ |
3105 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
719fc62f | 3106 | packet_put_int(remote_id); |
0b242b12 | 3107 | } else { |
0b242b12 | 3108 | /* Send a confirmation to the remote host. */ |
3109 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
719fc62f | 3110 | packet_put_int(remote_id); |
3111 | packet_put_int(c->self); | |
0b242b12 | 3112 | } |
719fc62f | 3113 | packet_send(); |
8efc0c15 | 3114 | } |
3115 | ||
a22aff1f | 3116 | /* dummy protocol handler that denies SSH-1 requests (agent/x11) */ |
ebb90778 | 3117 | /* ARGSUSED */ |
a22aff1f | 3118 | void |
7819b5c3 | 3119 | deny_input_open(int type, u_int32_t seq, void *ctxt) |
a22aff1f | 3120 | { |
3121 | int rchan = packet_get_int(); | |
e1feb9bf | 3122 | |
6aacefa7 | 3123 | switch (type) { |
a22aff1f | 3124 | case SSH_SMSG_AGENT_OPEN: |
3125 | error("Warning: ssh server tried agent forwarding."); | |
3126 | break; | |
3127 | case SSH_SMSG_X11_OPEN: | |
3128 | error("Warning: ssh server tried X11 forwarding."); | |
3129 | break; | |
3130 | default: | |
7819b5c3 | 3131 | error("deny_input_open: type %d", type); |
a22aff1f | 3132 | break; |
3133 | } | |
1908529f | 3134 | error("Warning: this is probably a break-in attempt by a malicious server."); |
a22aff1f | 3135 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
3136 | packet_put_int(rchan); | |
3137 | packet_send(); | |
3138 | } | |
3139 | ||
aa3378df | 3140 | /* |
3141 | * Requests forwarding of X11 connections, generates fake authentication | |
3142 | * data, and enables authentication spoofing. | |
8e7895b8 | 3143 | * This should be called in the client only. |
aa3378df | 3144 | */ |
6ae2364d | 3145 | void |
9bf083eb | 3146 | x11_request_forwarding_with_spoofing(int client_session_id, const char *disp, |
0b242b12 | 3147 | const char *proto, const char *data) |
8efc0c15 | 3148 | { |
1e3b8b07 | 3149 | u_int data_len = (u_int) strlen(data) / 2; |
ef07103c | 3150 | u_int i, value; |
5260325f | 3151 | char *new_data; |
3152 | int screen_number; | |
3153 | const char *cp; | |
ca75d7de | 3154 | u_int32_t rnd = 0; |
5260325f | 3155 | |
4297b666 | 3156 | if (x11_saved_display == NULL) |
3157 | x11_saved_display = xstrdup(disp); | |
3158 | else if (strcmp(disp, x11_saved_display) != 0) { | |
ef07103c | 3159 | error("x11_request_forwarding_with_spoofing: different " |
3160 | "$DISPLAY already forwarded"); | |
3161 | return; | |
3162 | } | |
3163 | ||
9bf083eb | 3164 | cp = disp; |
3165 | if (disp) | |
3166 | cp = strchr(disp, ':'); | |
5260325f | 3167 | if (cp) |
3168 | cp = strchr(cp, '.'); | |
3169 | if (cp) | |
d6d4897e | 3170 | screen_number = (u_int)strtonum(cp + 1, 0, 400, NULL); |
5260325f | 3171 | else |
3172 | screen_number = 0; | |
3173 | ||
ef07103c | 3174 | if (x11_saved_proto == NULL) { |
3175 | /* Save protocol name. */ | |
3176 | x11_saved_proto = xstrdup(proto); | |
3177 | /* | |
56964485 | 3178 | * Extract real authentication data and generate fake data |
ef07103c | 3179 | * of the same length. |
3180 | */ | |
3181 | x11_saved_data = xmalloc(data_len); | |
3182 | x11_fake_data = xmalloc(data_len); | |
3183 | for (i = 0; i < data_len; i++) { | |
3184 | if (sscanf(data + 2 * i, "%2x", &value) != 1) | |
3185 | fatal("x11_request_forwarding: bad " | |
3186 | "authentication data: %.100s", data); | |
3187 | if (i % 4 == 0) | |
3188 | rnd = arc4random(); | |
3189 | x11_saved_data[i] = value; | |
3190 | x11_fake_data[i] = rnd & 0xff; | |
3191 | rnd >>= 8; | |
3192 | } | |
3193 | x11_saved_data_len = data_len; | |
3194 | x11_fake_data_len = data_len; | |
3195 | } | |
5260325f | 3196 | |
3197 | /* Convert the fake data into hex. */ | |
ef07103c | 3198 | new_data = tohex(x11_fake_data, data_len); |
5260325f | 3199 | |
3200 | /* Send the request packet. */ | |
0b242b12 | 3201 | if (compat20) { |
3202 | channel_request_start(client_session_id, "x11-req", 0); | |
3203 | packet_put_char(0); /* XXX bool single connection */ | |
3204 | } else { | |
3205 | packet_start(SSH_CMSG_X11_REQUEST_FORWARDING); | |
3206 | } | |
3207 | packet_put_cstring(proto); | |
3208 | packet_put_cstring(new_data); | |
5260325f | 3209 | packet_put_int(screen_number); |
3210 | packet_send(); | |
3211 | packet_write_wait(); | |
3212 | xfree(new_data); | |
8efc0c15 | 3213 | } |
3214 | ||
8e7895b8 | 3215 | |
3216 | /* -- agent forwarding */ | |
3217 | ||
8efc0c15 | 3218 | /* Sends a message to the server to request authentication fd forwarding. */ |
3219 | ||
6ae2364d | 3220 | void |
d5bb9418 | 3221 | auth_request_forwarding(void) |
8efc0c15 | 3222 | { |
5260325f | 3223 | packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING); |
3224 | packet_send(); | |
3225 | packet_write_wait(); | |
8efc0c15 | 3226 | } |