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8efc0c15 | 1 | /* |
5260325f | 2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
5260325f | 3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
4 | * All rights reserved | |
5260325f | 5 | * This file contains functions for generic socket connection forwarding. |
6 | * There is also code for initiating connection forwarding for X11 connections, | |
7 | * arbitrary tcp/ip connections, and the authentication agent connection. | |
6ae2364d | 8 | * |
bcbf86ec | 9 | * As far as I am concerned, the code I have written for this software |
10 | * can be used freely for any purpose. Any derived versions of this | |
11 | * software must be clearly marked as such, and if the derived work is | |
12 | * incompatible with the protocol description in the RFC file, it must be | |
13 | * called by a name other than "ssh" or "Secure Shell". | |
14 | * | |
15 | * | |
7e7327a1 | 16 | * SSH2 support added by Markus Friedl. |
bcbf86ec | 17 | * Copyright (c) 1999,2000 Markus Friedl. All rights reserved. |
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" | |
0ae4fe1d | 43 | RCSID("$OpenBSD: channels.c,v 1.91 2001/02/15 23:19:59 markus Exp $"); |
42f11eb2 | 44 | |
45 | #include <openssl/rsa.h> | |
46 | #include <openssl/dsa.h> | |
8efc0c15 | 47 | |
48 | #include "ssh.h" | |
42f11eb2 | 49 | #include "ssh1.h" |
50 | #include "ssh2.h" | |
8efc0c15 | 51 | #include "packet.h" |
52 | #include "xmalloc.h" | |
53 | #include "buffer.h" | |
8efc0c15 | 54 | #include "uidswap.h" |
42f11eb2 | 55 | #include "log.h" |
56 | #include "misc.h" | |
8efc0c15 | 57 | #include "channels.h" |
58 | #include "nchan.h" | |
59 | #include "compat.h" | |
42f11eb2 | 60 | #include "canohost.h" |
4c8722d9 | 61 | #include "key.h" |
62 | #include "authfd.h" | |
7e7327a1 | 63 | |
8efc0c15 | 64 | /* Maximum number of fake X11 displays to try. */ |
65 | #define MAX_DISPLAYS 1000 | |
66 | ||
67 | /* Max len of agent socket */ | |
68 | #define MAX_SOCKET_NAME 100 | |
69 | ||
aa3378df | 70 | /* |
71 | * Pointer to an array containing all allocated channels. The array is | |
72 | * dynamically extended as needed. | |
73 | */ | |
8efc0c15 | 74 | static Channel *channels = NULL; |
75 | ||
aa3378df | 76 | /* |
77 | * Size of the channel array. All slots of the array must always be | |
78 | * initialized (at least the type field); unused slots are marked with type | |
79 | * SSH_CHANNEL_FREE. | |
80 | */ | |
8efc0c15 | 81 | static int channels_alloc = 0; |
82 | ||
aa3378df | 83 | /* |
84 | * Maximum file descriptor value used in any of the channels. This is | |
85 | * updated in channel_allocate. | |
86 | */ | |
39929cdb | 87 | static int channel_max_fd = 0; |
8efc0c15 | 88 | |
89 | /* Name and directory of socket for authentication agent forwarding. */ | |
90 | static char *channel_forwarded_auth_socket_name = NULL; | |
5260325f | 91 | static char *channel_forwarded_auth_socket_dir = NULL; |
8efc0c15 | 92 | |
93 | /* Saved X11 authentication protocol name. */ | |
94 | char *x11_saved_proto = NULL; | |
95 | ||
96 | /* Saved X11 authentication data. This is the real data. */ | |
97 | char *x11_saved_data = NULL; | |
1e3b8b07 | 98 | u_int x11_saved_data_len = 0; |
8efc0c15 | 99 | |
aa3378df | 100 | /* |
101 | * Fake X11 authentication data. This is what the server will be sending us; | |
102 | * we should replace any occurrences of this by the real data. | |
103 | */ | |
8efc0c15 | 104 | char *x11_fake_data = NULL; |
1e3b8b07 | 105 | u_int x11_fake_data_len; |
8efc0c15 | 106 | |
aa3378df | 107 | /* |
108 | * Data structure for storing which hosts are permitted for forward requests. | |
109 | * The local sides of any remote forwards are stored in this array to prevent | |
110 | * a corrupt remote server from accessing arbitrary TCP/IP ports on our local | |
111 | * network (which might be behind a firewall). | |
112 | */ | |
5260325f | 113 | typedef struct { |
7368a6c8 | 114 | char *host_to_connect; /* Connect to 'host'. */ |
115 | u_short port_to_connect; /* Connect to 'port'. */ | |
116 | u_short listen_port; /* Remote side should listen port number. */ | |
8efc0c15 | 117 | } ForwardPermission; |
118 | ||
119 | /* List of all permitted host/port pairs to connect. */ | |
120 | static ForwardPermission permitted_opens[SSH_MAX_FORWARDS_PER_DIRECTION]; | |
121 | /* Number of permitted host/port pairs in the array. */ | |
122 | static int num_permitted_opens = 0; | |
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 | ||
130 | /* This is set to true if both sides support SSH_PROTOFLAG_HOST_IN_FWD_OPEN. */ | |
131 | static int have_hostname_in_open = 0; | |
132 | ||
42f11eb2 | 133 | /* AF_UNSPEC or AF_INET or AF_INET6 */ |
134 | extern int IPv4or6; | |
135 | ||
8efc0c15 | 136 | /* Sets specific protocol options. */ |
137 | ||
6ae2364d | 138 | void |
5260325f | 139 | channel_set_options(int hostname_in_open) |
8efc0c15 | 140 | { |
5260325f | 141 | have_hostname_in_open = hostname_in_open; |
8efc0c15 | 142 | } |
143 | ||
aa3378df | 144 | /* |
145 | * Permits opening to any host/port in SSH_MSG_PORT_OPEN. This is usually | |
146 | * called by the server, because the user could connect to any port anyway, | |
147 | * and the server has no way to know but to trust the client anyway. | |
148 | */ | |
8efc0c15 | 149 | |
6ae2364d | 150 | void |
5260325f | 151 | channel_permit_all_opens() |
8efc0c15 | 152 | { |
5260325f | 153 | all_opens_permitted = 1; |
8efc0c15 | 154 | } |
155 | ||
7368a6c8 | 156 | /* lookup channel by id */ |
157 | ||
158 | Channel * | |
159 | channel_lookup(int id) | |
160 | { | |
161 | Channel *c; | |
3e98362e | 162 | if (id < 0 || id > channels_alloc) { |
7368a6c8 | 163 | log("channel_lookup: %d: bad id", id); |
164 | return NULL; | |
165 | } | |
166 | c = &channels[id]; | |
167 | if (c->type == SSH_CHANNEL_FREE) { | |
168 | log("channel_lookup: %d: bad id: channel free", id); | |
169 | return NULL; | |
170 | } | |
171 | return c; | |
172 | } | |
173 | ||
aa3378df | 174 | /* |
1d1ffb87 | 175 | * Register filedescriptors for a channel, used when allocating a channel or |
0fbe8c74 | 176 | * when the channel consumer/producer is ready, e.g. shell exec'd |
aa3378df | 177 | */ |
8efc0c15 | 178 | |
0fbe8c74 | 179 | void |
a22aff1f | 180 | channel_register_fds(Channel *c, int rfd, int wfd, int efd, |
181 | int extusage, int nonblock) | |
8efc0c15 | 182 | { |
5260325f | 183 | /* Update the maximum file descriptor value. */ |
39929cdb | 184 | channel_max_fd = MAX(channel_max_fd, rfd); |
185 | channel_max_fd = MAX(channel_max_fd, wfd); | |
186 | channel_max_fd = MAX(channel_max_fd, efd); | |
187 | ||
aa3378df | 188 | /* XXX set close-on-exec -markus */ |
1d1ffb87 | 189 | |
0fbe8c74 | 190 | c->rfd = rfd; |
191 | c->wfd = wfd; | |
192 | c->sock = (rfd == wfd) ? rfd : -1; | |
193 | c->efd = efd; | |
194 | c->extended_usage = extusage; | |
a22aff1f | 195 | |
0ae4fe1d | 196 | /* XXX ugly hack: nonblock is only set by the server */ |
197 | if (nonblock && isatty(c->rfd)) { | |
198 | debug("channel: %d: rfd %d isatty", c->self, c->rfd); | |
199 | c->isatty = 1; | |
200 | if (!isatty(c->wfd)) { | |
201 | error("channel: %d: wfd %d is not a tty?", | |
202 | c->self, c->wfd); | |
203 | } | |
204 | } else { | |
205 | c->isatty = 0; | |
206 | } | |
207 | ||
a22aff1f | 208 | /* enable nonblocking mode */ |
209 | if (nonblock) { | |
210 | if (rfd != -1) | |
211 | set_nonblock(rfd); | |
212 | if (wfd != -1) | |
213 | set_nonblock(wfd); | |
214 | if (efd != -1) | |
215 | set_nonblock(efd); | |
216 | } | |
0fbe8c74 | 217 | } |
218 | ||
219 | /* | |
220 | * Allocate a new channel object and set its type and socket. This will cause | |
221 | * remote_name to be freed. | |
222 | */ | |
223 | ||
224 | int | |
225 | channel_new(char *ctype, int type, int rfd, int wfd, int efd, | |
a22aff1f | 226 | int window, int maxpack, int extusage, char *remote_name, int nonblock) |
0fbe8c74 | 227 | { |
228 | int i, found; | |
229 | Channel *c; | |
5260325f | 230 | |
231 | /* Do initial allocation if this is the first call. */ | |
232 | if (channels_alloc == 0) { | |
7e7327a1 | 233 | chan_init(); |
5260325f | 234 | channels_alloc = 10; |
235 | channels = xmalloc(channels_alloc * sizeof(Channel)); | |
236 | for (i = 0; i < channels_alloc; i++) | |
237 | channels[i].type = SSH_CHANNEL_FREE; | |
aa3378df | 238 | /* |
239 | * Kludge: arrange a call to channel_stop_listening if we | |
240 | * terminate with fatal(). | |
241 | */ | |
5260325f | 242 | fatal_add_cleanup((void (*) (void *)) channel_stop_listening, NULL); |
243 | } | |
244 | /* Try to find a free slot where to put the new channel. */ | |
245 | for (found = -1, i = 0; i < channels_alloc; i++) | |
246 | if (channels[i].type == SSH_CHANNEL_FREE) { | |
247 | /* Found a free slot. */ | |
248 | found = i; | |
249 | break; | |
250 | } | |
251 | if (found == -1) { | |
aa3378df | 252 | /* There are no free slots. Take last+1 slot and expand the array. */ |
5260325f | 253 | found = channels_alloc; |
254 | channels_alloc += 10; | |
de273eef | 255 | debug2("channel: expanding %d", channels_alloc); |
5260325f | 256 | channels = xrealloc(channels, channels_alloc * sizeof(Channel)); |
257 | for (i = found; i < channels_alloc; i++) | |
258 | channels[i].type = SSH_CHANNEL_FREE; | |
259 | } | |
260 | /* Initialize and return new channel number. */ | |
261 | c = &channels[found]; | |
262 | buffer_init(&c->input); | |
263 | buffer_init(&c->output); | |
7368a6c8 | 264 | buffer_init(&c->extended); |
5260325f | 265 | chan_init_iostates(c); |
a22aff1f | 266 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock); |
5260325f | 267 | c->self = found; |
268 | c->type = type; | |
7368a6c8 | 269 | c->ctype = ctype; |
0b242b12 | 270 | c->local_window = window; |
271 | c->local_window_max = window; | |
272 | c->local_consumed = 0; | |
273 | c->local_maxpacket = maxpack; | |
5260325f | 274 | c->remote_id = -1; |
275 | c->remote_name = remote_name; | |
7368a6c8 | 276 | c->remote_window = 0; |
277 | c->remote_maxpacket = 0; | |
278 | c->cb_fn = NULL; | |
279 | c->cb_arg = NULL; | |
280 | c->cb_event = 0; | |
281 | c->dettach_user = NULL; | |
2e73a022 | 282 | c->input_filter = NULL; |
5260325f | 283 | debug("channel %d: new [%s]", found, remote_name); |
284 | return found; | |
8efc0c15 | 285 | } |
0fbe8c74 | 286 | /* old interface XXX */ |
6ae2364d | 287 | int |
7368a6c8 | 288 | channel_allocate(int type, int sock, char *remote_name) |
289 | { | |
a22aff1f | 290 | return channel_new("", type, sock, sock, -1, 0, 0, 0, remote_name, 1); |
7368a6c8 | 291 | } |
8efc0c15 | 292 | |
0fbe8c74 | 293 | |
294 | /* Close all channel fd/socket. */ | |
295 | ||
296 | void | |
297 | channel_close_fds(Channel *c) | |
298 | { | |
299 | if (c->sock != -1) { | |
300 | close(c->sock); | |
301 | c->sock = -1; | |
302 | } | |
303 | if (c->rfd != -1) { | |
304 | close(c->rfd); | |
305 | c->rfd = -1; | |
306 | } | |
307 | if (c->wfd != -1) { | |
308 | close(c->wfd); | |
309 | c->wfd = -1; | |
310 | } | |
311 | if (c->efd != -1) { | |
312 | close(c->efd); | |
313 | c->efd = -1; | |
314 | } | |
315 | } | |
316 | ||
317 | /* Free the channel and close its fd/socket. */ | |
8efc0c15 | 318 | |
6ae2364d | 319 | void |
7368a6c8 | 320 | channel_free(int id) |
8efc0c15 | 321 | { |
7368a6c8 | 322 | Channel *c = channel_lookup(id); |
b148018f | 323 | char *s = channel_open_message(); |
324 | ||
7368a6c8 | 325 | if (c == NULL) |
326 | packet_disconnect("channel free: bad local channel %d", id); | |
b148018f | 327 | debug("channel_free: channel %d: status: %s", id, s); |
328 | xfree(s); | |
329 | ||
7e7327a1 | 330 | if (c->dettach_user != NULL) { |
331 | debug("channel_free: channel %d: dettaching channel user", id); | |
332 | c->dettach_user(c->self, NULL); | |
333 | } | |
0fbe8c74 | 334 | if (c->sock != -1) |
7368a6c8 | 335 | shutdown(c->sock, SHUT_RDWR); |
0fbe8c74 | 336 | channel_close_fds(c); |
7368a6c8 | 337 | buffer_free(&c->input); |
338 | buffer_free(&c->output); | |
339 | buffer_free(&c->extended); | |
340 | c->type = SSH_CHANNEL_FREE; | |
341 | if (c->remote_name) { | |
342 | xfree(c->remote_name); | |
343 | c->remote_name = NULL; | |
5260325f | 344 | } |
8efc0c15 | 345 | } |
346 | ||
aa3378df | 347 | /* |
7368a6c8 | 348 | * 'channel_pre*' are called just before select() to add any bits relevant to |
349 | * channels in the select bitmasks. | |
aa3378df | 350 | */ |
7368a6c8 | 351 | /* |
352 | * 'channel_post*': perform any appropriate operations for channels which | |
353 | * have events pending. | |
354 | */ | |
355 | typedef void chan_fn(Channel *c, fd_set * readset, fd_set * writeset); | |
356 | chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE]; | |
357 | chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE]; | |
8efc0c15 | 358 | |
7368a6c8 | 359 | void |
360 | channel_pre_listener(Channel *c, fd_set * readset, fd_set * writeset) | |
8efc0c15 | 361 | { |
7368a6c8 | 362 | FD_SET(c->sock, readset); |
363 | } | |
5260325f | 364 | |
97fb6912 | 365 | void |
366 | channel_pre_connecting(Channel *c, fd_set * readset, fd_set * writeset) | |
367 | { | |
368 | debug3("channel %d: waiting for connection", c->self); | |
369 | FD_SET(c->sock, writeset); | |
370 | } | |
371 | ||
7368a6c8 | 372 | void |
373 | channel_pre_open_13(Channel *c, fd_set * readset, fd_set * writeset) | |
374 | { | |
375 | if (buffer_len(&c->input) < packet_get_maxsize()) | |
376 | FD_SET(c->sock, readset); | |
377 | if (buffer_len(&c->output) > 0) | |
378 | FD_SET(c->sock, writeset); | |
379 | } | |
5260325f | 380 | |
7368a6c8 | 381 | void |
382 | channel_pre_open_15(Channel *c, fd_set * readset, fd_set * writeset) | |
383 | { | |
384 | /* test whether sockets are 'alive' for read/write */ | |
385 | if (c->istate == CHAN_INPUT_OPEN) | |
386 | if (buffer_len(&c->input) < packet_get_maxsize()) | |
387 | FD_SET(c->sock, readset); | |
388 | if (c->ostate == CHAN_OUTPUT_OPEN || | |
389 | c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { | |
390 | if (buffer_len(&c->output) > 0) { | |
391 | FD_SET(c->sock, writeset); | |
392 | } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { | |
393 | chan_obuf_empty(c); | |
394 | } | |
395 | } | |
396 | } | |
5260325f | 397 | |
7e7327a1 | 398 | void |
399 | channel_pre_open_20(Channel *c, fd_set * readset, fd_set * writeset) | |
400 | { | |
401 | if (c->istate == CHAN_INPUT_OPEN && | |
402 | c->remote_window > 0 && | |
403 | buffer_len(&c->input) < c->remote_window) | |
404 | FD_SET(c->rfd, readset); | |
405 | if (c->ostate == CHAN_OUTPUT_OPEN || | |
406 | c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { | |
407 | if (buffer_len(&c->output) > 0) { | |
408 | FD_SET(c->wfd, writeset); | |
409 | } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { | |
410 | chan_obuf_empty(c); | |
411 | } | |
412 | } | |
413 | /** XXX check close conditions, too */ | |
414 | if (c->efd != -1) { | |
415 | if (c->extended_usage == CHAN_EXTENDED_WRITE && | |
416 | buffer_len(&c->extended) > 0) | |
417 | FD_SET(c->efd, writeset); | |
418 | else if (c->extended_usage == CHAN_EXTENDED_READ && | |
419 | buffer_len(&c->extended) < c->remote_window) | |
420 | FD_SET(c->efd, readset); | |
421 | } | |
422 | } | |
423 | ||
7368a6c8 | 424 | void |
425 | channel_pre_input_draining(Channel *c, fd_set * readset, fd_set * writeset) | |
426 | { | |
427 | if (buffer_len(&c->input) == 0) { | |
428 | packet_start(SSH_MSG_CHANNEL_CLOSE); | |
429 | packet_put_int(c->remote_id); | |
430 | packet_send(); | |
431 | c->type = SSH_CHANNEL_CLOSED; | |
432 | debug("Closing channel %d after input drain.", c->self); | |
433 | } | |
434 | } | |
5260325f | 435 | |
7368a6c8 | 436 | void |
437 | channel_pre_output_draining(Channel *c, fd_set * readset, fd_set * writeset) | |
438 | { | |
439 | if (buffer_len(&c->output) == 0) | |
440 | channel_free(c->self); | |
6ae2364d | 441 | else |
7368a6c8 | 442 | FD_SET(c->sock, writeset); |
443 | } | |
5260325f | 444 | |
7368a6c8 | 445 | /* |
446 | * This is a special state for X11 authentication spoofing. An opened X11 | |
447 | * connection (when authentication spoofing is being done) remains in this | |
448 | * state until the first packet has been completely read. The authentication | |
449 | * data in that packet is then substituted by the real data if it matches the | |
450 | * fake data, and the channel is put into normal mode. | |
0b242b12 | 451 | * XXX All this happens at the client side. |
7368a6c8 | 452 | */ |
453 | int | |
454 | x11_open_helper(Channel *c) | |
455 | { | |
1e3b8b07 | 456 | u_char *ucp; |
457 | u_int proto_len, data_len; | |
5260325f | 458 | |
7368a6c8 | 459 | /* Check if the fixed size part of the packet is in buffer. */ |
460 | if (buffer_len(&c->output) < 12) | |
461 | return 0; | |
462 | ||
463 | /* Parse the lengths of variable-length fields. */ | |
1e3b8b07 | 464 | ucp = (u_char *) buffer_ptr(&c->output); |
7368a6c8 | 465 | if (ucp[0] == 0x42) { /* Byte order MSB first. */ |
466 | proto_len = 256 * ucp[6] + ucp[7]; | |
467 | data_len = 256 * ucp[8] + ucp[9]; | |
468 | } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */ | |
469 | proto_len = ucp[6] + 256 * ucp[7]; | |
470 | data_len = ucp[8] + 256 * ucp[9]; | |
471 | } else { | |
472 | debug("Initial X11 packet contains bad byte order byte: 0x%x", | |
473 | ucp[0]); | |
474 | return -1; | |
475 | } | |
5260325f | 476 | |
7368a6c8 | 477 | /* Check if the whole packet is in buffer. */ |
478 | if (buffer_len(&c->output) < | |
479 | 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3)) | |
480 | return 0; | |
5260325f | 481 | |
7368a6c8 | 482 | /* Check if authentication protocol matches. */ |
483 | if (proto_len != strlen(x11_saved_proto) || | |
484 | memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) { | |
485 | debug("X11 connection uses different authentication protocol."); | |
486 | return -1; | |
487 | } | |
488 | /* Check if authentication data matches our fake data. */ | |
489 | if (data_len != x11_fake_data_len || | |
490 | memcmp(ucp + 12 + ((proto_len + 3) & ~3), | |
491 | x11_fake_data, x11_fake_data_len) != 0) { | |
492 | debug("X11 auth data does not match fake data."); | |
493 | return -1; | |
494 | } | |
495 | /* Check fake data length */ | |
496 | if (x11_fake_data_len != x11_saved_data_len) { | |
497 | error("X11 fake_data_len %d != saved_data_len %d", | |
498 | x11_fake_data_len, x11_saved_data_len); | |
499 | return -1; | |
500 | } | |
501 | /* | |
502 | * Received authentication protocol and data match | |
503 | * our fake data. Substitute the fake data with real | |
504 | * data. | |
505 | */ | |
506 | memcpy(ucp + 12 + ((proto_len + 3) & ~3), | |
507 | x11_saved_data, x11_saved_data_len); | |
508 | return 1; | |
509 | } | |
5260325f | 510 | |
7368a6c8 | 511 | void |
512 | channel_pre_x11_open_13(Channel *c, fd_set * readset, fd_set * writeset) | |
513 | { | |
514 | int ret = x11_open_helper(c); | |
515 | if (ret == 1) { | |
516 | /* Start normal processing for the channel. */ | |
517 | c->type = SSH_CHANNEL_OPEN; | |
a8be9f80 | 518 | channel_pre_open_13(c, readset, writeset); |
7368a6c8 | 519 | } else if (ret == -1) { |
520 | /* | |
521 | * We have received an X11 connection that has bad | |
522 | * authentication information. | |
523 | */ | |
524 | log("X11 connection rejected because of wrong authentication.\r\n"); | |
525 | buffer_clear(&c->input); | |
526 | buffer_clear(&c->output); | |
527 | close(c->sock); | |
528 | c->sock = -1; | |
529 | c->type = SSH_CHANNEL_CLOSED; | |
530 | packet_start(SSH_MSG_CHANNEL_CLOSE); | |
531 | packet_put_int(c->remote_id); | |
532 | packet_send(); | |
533 | } | |
534 | } | |
5260325f | 535 | |
7368a6c8 | 536 | void |
0b242b12 | 537 | channel_pre_x11_open(Channel *c, fd_set * readset, fd_set * writeset) |
7368a6c8 | 538 | { |
539 | int ret = x11_open_helper(c); | |
540 | if (ret == 1) { | |
541 | c->type = SSH_CHANNEL_OPEN; | |
d0c832f3 | 542 | if (compat20) |
543 | channel_pre_open_20(c, readset, writeset); | |
544 | else | |
545 | channel_pre_open_15(c, readset, writeset); | |
7368a6c8 | 546 | } else if (ret == -1) { |
547 | debug("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate); | |
0b242b12 | 548 | chan_read_failed(c); /** force close? */ |
7368a6c8 | 549 | chan_write_failed(c); |
550 | debug("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate); | |
551 | } | |
552 | } | |
5260325f | 553 | |
7368a6c8 | 554 | /* This is our fake X11 server socket. */ |
555 | void | |
556 | channel_post_x11_listener(Channel *c, fd_set * readset, fd_set * writeset) | |
557 | { | |
558 | struct sockaddr addr; | |
559 | int newsock, newch; | |
560 | socklen_t addrlen; | |
865ac82e | 561 | char buf[16384], *remote_ipaddr; |
0b242b12 | 562 | int remote_port; |
7368a6c8 | 563 | |
564 | if (FD_ISSET(c->sock, readset)) { | |
565 | debug("X11 connection requested."); | |
566 | addrlen = sizeof(addr); | |
567 | newsock = accept(c->sock, &addr, &addrlen); | |
568 | if (newsock < 0) { | |
569 | error("accept: %.100s", strerror(errno)); | |
570 | return; | |
5260325f | 571 | } |
865ac82e | 572 | remote_ipaddr = get_peer_ipaddr(newsock); |
0b242b12 | 573 | remote_port = get_peer_port(newsock); |
7368a6c8 | 574 | snprintf(buf, sizeof buf, "X11 connection from %.200s port %d", |
865ac82e | 575 | remote_ipaddr, remote_port); |
0b242b12 | 576 | |
577 | newch = channel_new("x11", | |
578 | SSH_CHANNEL_OPENING, newsock, newsock, -1, | |
579 | c->local_window_max, c->local_maxpacket, | |
a22aff1f | 580 | 0, xstrdup(buf), 1); |
0b242b12 | 581 | if (compat20) { |
582 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
583 | packet_put_cstring("x11"); | |
584 | packet_put_int(newch); | |
585 | packet_put_int(c->local_window_max); | |
586 | packet_put_int(c->local_maxpacket); | |
865ac82e | 587 | /* originator ipaddr and port */ |
588 | packet_put_cstring(remote_ipaddr); | |
d0c832f3 | 589 | if (datafellows & SSH_BUG_X11FWD) { |
590 | debug("ssh2 x11 bug compat mode"); | |
591 | } else { | |
592 | packet_put_int(remote_port); | |
593 | } | |
0b242b12 | 594 | packet_send(); |
595 | } else { | |
596 | packet_start(SSH_SMSG_X11_OPEN); | |
597 | packet_put_int(newch); | |
598 | if (have_hostname_in_open) | |
599 | packet_put_string(buf, strlen(buf)); | |
600 | packet_send(); | |
601 | } | |
865ac82e | 602 | xfree(remote_ipaddr); |
8efc0c15 | 603 | } |
8efc0c15 | 604 | } |
605 | ||
aa3378df | 606 | /* |
7368a6c8 | 607 | * This socket is listening for connections to a forwarded TCP/IP port. |
aa3378df | 608 | */ |
7368a6c8 | 609 | void |
610 | channel_post_port_listener(Channel *c, fd_set * readset, fd_set * writeset) | |
611 | { | |
612 | struct sockaddr addr; | |
613 | int newsock, newch; | |
614 | socklen_t addrlen; | |
61e96248 | 615 | char buf[1024], *remote_ipaddr, *rtype; |
7368a6c8 | 616 | int remote_port; |
617 | ||
fa08c86b | 618 | rtype = (c->type == SSH_CHANNEL_RPORT_LISTENER) ? |
619 | "forwarded-tcpip" : "direct-tcpip"; | |
620 | ||
7368a6c8 | 621 | if (FD_ISSET(c->sock, readset)) { |
622 | debug("Connection to port %d forwarding " | |
623 | "to %.100s port %d requested.", | |
624 | c->listening_port, c->path, c->host_port); | |
625 | addrlen = sizeof(addr); | |
626 | newsock = accept(c->sock, &addr, &addrlen); | |
627 | if (newsock < 0) { | |
628 | error("accept: %.100s", strerror(errno)); | |
629 | return; | |
630 | } | |
61e96248 | 631 | remote_ipaddr = get_peer_ipaddr(newsock); |
7368a6c8 | 632 | remote_port = get_peer_port(newsock); |
633 | snprintf(buf, sizeof buf, | |
634 | "listen port %d for %.100s port %d, " | |
635 | "connect from %.200s port %d", | |
636 | c->listening_port, c->path, c->host_port, | |
61e96248 | 637 | remote_ipaddr, remote_port); |
fa08c86b | 638 | |
639 | newch = channel_new(rtype, | |
7368a6c8 | 640 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
641 | c->local_window_max, c->local_maxpacket, | |
a22aff1f | 642 | 0, xstrdup(buf), 1); |
7e7327a1 | 643 | if (compat20) { |
644 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
fa08c86b | 645 | packet_put_cstring(rtype); |
7e7327a1 | 646 | packet_put_int(newch); |
647 | packet_put_int(c->local_window_max); | |
648 | packet_put_int(c->local_maxpacket); | |
fa08c86b | 649 | if (c->type == SSH_CHANNEL_RPORT_LISTENER) { |
650 | /* listen address, port */ | |
651 | packet_put_string(c->path, strlen(c->path)); | |
652 | packet_put_int(c->listening_port); | |
653 | } else { | |
654 | /* target host, port */ | |
655 | packet_put_string(c->path, strlen(c->path)); | |
656 | packet_put_int(c->host_port); | |
657 | } | |
6ae2364d | 658 | /* originator host and port */ |
61e96248 | 659 | packet_put_cstring(remote_ipaddr); |
7e7327a1 | 660 | packet_put_int(remote_port); |
661 | packet_send(); | |
662 | } else { | |
663 | packet_start(SSH_MSG_PORT_OPEN); | |
664 | packet_put_int(newch); | |
665 | packet_put_string(c->path, strlen(c->path)); | |
666 | packet_put_int(c->host_port); | |
667 | if (have_hostname_in_open) { | |
668 | packet_put_string(buf, strlen(buf)); | |
669 | } | |
670 | packet_send(); | |
7368a6c8 | 671 | } |
61e96248 | 672 | xfree(remote_ipaddr); |
7368a6c8 | 673 | } |
674 | } | |
8efc0c15 | 675 | |
7368a6c8 | 676 | /* |
677 | * This is the authentication agent socket listening for connections from | |
678 | * clients. | |
679 | */ | |
680 | void | |
681 | channel_post_auth_listener(Channel *c, fd_set * readset, fd_set * writeset) | |
8efc0c15 | 682 | { |
5260325f | 683 | struct sockaddr addr; |
7368a6c8 | 684 | int newsock, newch; |
48e671d5 | 685 | socklen_t addrlen; |
5260325f | 686 | |
7368a6c8 | 687 | if (FD_ISSET(c->sock, readset)) { |
688 | addrlen = sizeof(addr); | |
689 | newsock = accept(c->sock, &addr, &addrlen); | |
690 | if (newsock < 0) { | |
691 | error("accept from auth socket: %.100s", strerror(errno)); | |
692 | return; | |
693 | } | |
fa08c86b | 694 | newch = channel_new("accepted auth socket", |
695 | SSH_CHANNEL_OPENING, newsock, newsock, -1, | |
696 | c->local_window_max, c->local_maxpacket, | |
697 | 0, xstrdup("accepted auth socket"), 1); | |
698 | if (compat20) { | |
699 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
700 | packet_put_cstring("auth-agent@openssh.com"); | |
701 | packet_put_int(newch); | |
702 | packet_put_int(c->local_window_max); | |
703 | packet_put_int(c->local_maxpacket); | |
704 | } else { | |
705 | packet_start(SSH_SMSG_AGENT_OPEN); | |
706 | packet_put_int(newch); | |
707 | } | |
7368a6c8 | 708 | packet_send(); |
709 | } | |
710 | } | |
5260325f | 711 | |
97fb6912 | 712 | void |
713 | channel_post_connecting(Channel *c, fd_set * readset, fd_set * writeset) | |
714 | { | |
715 | if (FD_ISSET(c->sock, writeset)) { | |
716 | int err = 0; | |
717 | int sz = sizeof(err); | |
718 | c->type = SSH_CHANNEL_OPEN; | |
2b87da3b | 719 | if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, (char *)&err, &sz) < 0) { |
97fb6912 | 720 | debug("getsockopt SO_ERROR failed"); |
721 | } else { | |
722 | if (err == 0) { | |
723 | debug("channel %d: connected)", c->self); | |
724 | } else { | |
725 | debug("channel %d: not connected: %s", | |
726 | c->self, strerror(err)); | |
727 | chan_read_failed(c); | |
728 | chan_write_failed(c); | |
729 | } | |
730 | } | |
731 | } | |
732 | } | |
733 | ||
7368a6c8 | 734 | int |
735 | channel_handle_rfd(Channel *c, fd_set * readset, fd_set * writeset) | |
736 | { | |
737 | char buf[16*1024]; | |
738 | int len; | |
739 | ||
740 | if (c->rfd != -1 && | |
741 | FD_ISSET(c->rfd, readset)) { | |
742 | len = read(c->rfd, buf, sizeof(buf)); | |
0fbe8c74 | 743 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
744 | return 1; | |
7368a6c8 | 745 | if (len <= 0) { |
0b242b12 | 746 | debug("channel %d: read<=0 rfd %d len %d", |
7368a6c8 | 747 | c->self, c->rfd, len); |
748 | if (compat13) { | |
749 | buffer_consume(&c->output, buffer_len(&c->output)); | |
750 | c->type = SSH_CHANNEL_INPUT_DRAINING; | |
751 | debug("Channel %d status set to input draining.", c->self); | |
752 | } else { | |
753 | chan_read_failed(c); | |
5260325f | 754 | } |
7368a6c8 | 755 | return -1; |
756 | } | |
2e73a022 | 757 | if(c->input_filter != NULL) { |
758 | if (c->input_filter(c, buf, len) == -1) { | |
759 | debug("filter stops channel %d", c->self); | |
760 | chan_read_failed(c); | |
761 | } | |
762 | } else { | |
763 | buffer_append(&c->input, buf, len); | |
764 | } | |
7368a6c8 | 765 | } |
766 | return 1; | |
767 | } | |
768 | int | |
769 | channel_handle_wfd(Channel *c, fd_set * readset, fd_set * writeset) | |
770 | { | |
771 | int len; | |
772 | ||
773 | /* Send buffered output data to the socket. */ | |
774 | if (c->wfd != -1 && | |
775 | FD_ISSET(c->wfd, writeset) && | |
776 | buffer_len(&c->output) > 0) { | |
777 | len = write(c->wfd, buffer_ptr(&c->output), | |
0fbe8c74 | 778 | buffer_len(&c->output)); |
779 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) | |
780 | return 1; | |
7368a6c8 | 781 | if (len <= 0) { |
782 | if (compat13) { | |
783 | buffer_consume(&c->output, buffer_len(&c->output)); | |
784 | debug("Channel %d status set to input draining.", c->self); | |
785 | c->type = SSH_CHANNEL_INPUT_DRAINING; | |
786 | } else { | |
787 | chan_write_failed(c); | |
5260325f | 788 | } |
7368a6c8 | 789 | return -1; |
790 | } | |
0ae4fe1d | 791 | if (compat20 && c->isatty) { |
792 | struct termios tio; | |
793 | if (tcgetattr(c->wfd, &tio) == 0 && | |
794 | !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) { | |
795 | /* | |
796 | * Simulate echo to reduce the impact of | |
797 | * traffic analysis. | |
798 | */ | |
799 | packet_start(SSH2_MSG_IGNORE); | |
800 | memset(buffer_ptr(&c->output), 0, len); | |
801 | packet_put_string(buffer_ptr(&c->output), len); | |
802 | packet_send(); | |
803 | debug("channel: %d simulate echo (%d)", c->self, len); | |
804 | } | |
805 | } | |
7368a6c8 | 806 | buffer_consume(&c->output, len); |
7e7327a1 | 807 | if (compat20 && len > 0) { |
808 | c->local_consumed += len; | |
809 | } | |
810 | } | |
811 | return 1; | |
812 | } | |
813 | int | |
814 | channel_handle_efd(Channel *c, fd_set * readset, fd_set * writeset) | |
815 | { | |
816 | char buf[16*1024]; | |
817 | int len; | |
818 | ||
8ce64345 | 819 | /** XXX handle drain efd, too */ |
7e7327a1 | 820 | if (c->efd != -1) { |
821 | if (c->extended_usage == CHAN_EXTENDED_WRITE && | |
822 | FD_ISSET(c->efd, writeset) && | |
823 | buffer_len(&c->extended) > 0) { | |
824 | len = write(c->efd, buffer_ptr(&c->extended), | |
825 | buffer_len(&c->extended)); | |
de273eef | 826 | debug2("channel %d: written %d to efd %d", |
7e7327a1 | 827 | c->self, len, c->efd); |
828 | if (len > 0) { | |
829 | buffer_consume(&c->extended, len); | |
830 | c->local_consumed += len; | |
831 | } | |
832 | } else if (c->extended_usage == CHAN_EXTENDED_READ && | |
833 | FD_ISSET(c->efd, readset)) { | |
834 | len = read(c->efd, buf, sizeof(buf)); | |
de273eef | 835 | debug2("channel %d: read %d from efd %d", |
7e7327a1 | 836 | c->self, len, c->efd); |
8ce64345 | 837 | if (len == 0) { |
838 | debug("channel %d: closing efd %d", | |
839 | c->self, c->efd); | |
840 | close(c->efd); | |
841 | c->efd = -1; | |
842 | } else if (len > 0) | |
7e7327a1 | 843 | buffer_append(&c->extended, buf, len); |
844 | } | |
845 | } | |
846 | return 1; | |
847 | } | |
848 | int | |
849 | channel_check_window(Channel *c, fd_set * readset, fd_set * writeset) | |
850 | { | |
e78a59f5 | 851 | if (!(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) && |
7e7327a1 | 852 | c->local_window < c->local_window_max/2 && |
853 | c->local_consumed > 0) { | |
854 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); | |
855 | packet_put_int(c->remote_id); | |
856 | packet_put_int(c->local_consumed); | |
857 | packet_send(); | |
de273eef | 858 | debug2("channel %d: window %d sent adjust %d", |
7e7327a1 | 859 | c->self, c->local_window, |
860 | c->local_consumed); | |
861 | c->local_window += c->local_consumed; | |
862 | c->local_consumed = 0; | |
7368a6c8 | 863 | } |
864 | return 1; | |
865 | } | |
5260325f | 866 | |
7368a6c8 | 867 | void |
868 | channel_post_open_1(Channel *c, fd_set * readset, fd_set * writeset) | |
869 | { | |
870 | channel_handle_rfd(c, readset, writeset); | |
871 | channel_handle_wfd(c, readset, writeset); | |
872 | } | |
aa3378df | 873 | |
7e7327a1 | 874 | void |
875 | channel_post_open_2(Channel *c, fd_set * readset, fd_set * writeset) | |
876 | { | |
877 | channel_handle_rfd(c, readset, writeset); | |
878 | channel_handle_wfd(c, readset, writeset); | |
879 | channel_handle_efd(c, readset, writeset); | |
880 | channel_check_window(c, readset, writeset); | |
881 | } | |
882 | ||
7368a6c8 | 883 | void |
884 | channel_post_output_drain_13(Channel *c, fd_set * readset, fd_set * writeset) | |
885 | { | |
886 | int len; | |
887 | /* Send buffered output data to the socket. */ | |
888 | if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) { | |
889 | len = write(c->sock, buffer_ptr(&c->output), | |
890 | buffer_len(&c->output)); | |
891 | if (len <= 0) | |
892 | buffer_consume(&c->output, buffer_len(&c->output)); | |
893 | else | |
894 | buffer_consume(&c->output, len); | |
895 | } | |
896 | } | |
5260325f | 897 | |
7e7327a1 | 898 | void |
899 | channel_handler_init_20(void) | |
900 | { | |
901 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_20; | |
0b242b12 | 902 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
7e7327a1 | 903 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; |
fa08c86b | 904 | channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener; |
0b242b12 | 905 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
fa08c86b | 906 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; |
97fb6912 | 907 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
7e7327a1 | 908 | |
909 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open_2; | |
910 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; | |
fa08c86b | 911 | channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener; |
0b242b12 | 912 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
fa08c86b | 913 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; |
97fb6912 | 914 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
7e7327a1 | 915 | } |
916 | ||
7368a6c8 | 917 | void |
918 | channel_handler_init_13(void) | |
919 | { | |
920 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13; | |
921 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_13; | |
922 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; | |
923 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; | |
924 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; | |
925 | channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining; | |
926 | channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining; | |
97fb6912 | 927 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
7368a6c8 | 928 | |
929 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open_1; | |
930 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; | |
931 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; | |
932 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; | |
933 | channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13; | |
97fb6912 | 934 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
7368a6c8 | 935 | } |
5260325f | 936 | |
7368a6c8 | 937 | void |
938 | channel_handler_init_15(void) | |
939 | { | |
940 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_15; | |
0b242b12 | 941 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
7368a6c8 | 942 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
943 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; | |
944 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; | |
97fb6912 | 945 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
7368a6c8 | 946 | |
947 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; | |
948 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; | |
949 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; | |
950 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open_1; | |
97fb6912 | 951 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
7368a6c8 | 952 | } |
953 | ||
954 | void | |
955 | channel_handler_init(void) | |
956 | { | |
957 | int i; | |
958 | for(i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) { | |
959 | channel_pre[i] = NULL; | |
960 | channel_post[i] = NULL; | |
961 | } | |
7e7327a1 | 962 | if (compat20) |
963 | channel_handler_init_20(); | |
964 | else if (compat13) | |
7368a6c8 | 965 | channel_handler_init_13(); |
966 | else | |
967 | channel_handler_init_15(); | |
968 | } | |
969 | ||
6ae2364d | 970 | void |
7368a6c8 | 971 | channel_handler(chan_fn *ftab[], fd_set * readset, fd_set * writeset) |
972 | { | |
973 | static int did_init = 0; | |
974 | int i; | |
975 | Channel *c; | |
976 | ||
977 | if (!did_init) { | |
978 | channel_handler_init(); | |
979 | did_init = 1; | |
980 | } | |
981 | for (i = 0; i < channels_alloc; i++) { | |
982 | c = &channels[i]; | |
983 | if (c->type == SSH_CHANNEL_FREE) | |
5260325f | 984 | continue; |
7368a6c8 | 985 | if (ftab[c->type] == NULL) |
986 | continue; | |
987 | (*ftab[c->type])(c, readset, writeset); | |
7e7327a1 | 988 | chan_delete_if_full_closed(c); |
8efc0c15 | 989 | } |
8efc0c15 | 990 | } |
991 | ||
6ae2364d | 992 | void |
39929cdb | 993 | channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp) |
7368a6c8 | 994 | { |
39929cdb | 995 | int n; |
996 | u_int sz; | |
997 | ||
998 | n = MAX(*maxfdp, channel_max_fd); | |
999 | ||
1000 | sz = howmany(n+1, NFDBITS) * sizeof(fd_mask); | |
1001 | if (*readsetp == NULL || n > *maxfdp) { | |
1002 | if (*readsetp) | |
1003 | xfree(*readsetp); | |
1004 | if (*writesetp) | |
1005 | xfree(*writesetp); | |
1006 | *readsetp = xmalloc(sz); | |
1007 | *writesetp = xmalloc(sz); | |
1008 | *maxfdp = n; | |
1009 | } | |
1010 | memset(*readsetp, 0, sz); | |
1011 | memset(*writesetp, 0, sz); | |
1012 | ||
1013 | channel_handler(channel_pre, *readsetp, *writesetp); | |
7368a6c8 | 1014 | } |
1015 | ||
6ae2364d | 1016 | void |
7368a6c8 | 1017 | channel_after_select(fd_set * readset, fd_set * writeset) |
1018 | { | |
1019 | channel_handler(channel_post, readset, writeset); | |
1020 | } | |
1021 | ||
39929cdb | 1022 | /* If there is data to send to the connection, enqueue some of it now. */ |
8efc0c15 | 1023 | |
6ae2364d | 1024 | void |
5260325f | 1025 | channel_output_poll() |
8efc0c15 | 1026 | { |
5260325f | 1027 | int len, i; |
7368a6c8 | 1028 | Channel *c; |
5260325f | 1029 | |
1030 | for (i = 0; i < channels_alloc; i++) { | |
7368a6c8 | 1031 | c = &channels[i]; |
48e671d5 | 1032 | |
aa3378df | 1033 | /* We are only interested in channels that can have buffered incoming data. */ |
48e671d5 | 1034 | if (compat13) { |
7368a6c8 | 1035 | if (c->type != SSH_CHANNEL_OPEN && |
1036 | c->type != SSH_CHANNEL_INPUT_DRAINING) | |
48e671d5 | 1037 | continue; |
1038 | } else { | |
7368a6c8 | 1039 | if (c->type != SSH_CHANNEL_OPEN) |
48e671d5 | 1040 | continue; |
7368a6c8 | 1041 | if (c->istate != CHAN_INPUT_OPEN && |
1042 | c->istate != CHAN_INPUT_WAIT_DRAIN) | |
48e671d5 | 1043 | continue; |
1044 | } | |
e78a59f5 | 1045 | if (compat20 && |
1046 | (c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) { | |
7e7327a1 | 1047 | debug("channel: %d: no data after CLOSE", c->self); |
1048 | continue; | |
1049 | } | |
5260325f | 1050 | |
1051 | /* Get the amount of buffered data for this channel. */ | |
7368a6c8 | 1052 | len = buffer_len(&c->input); |
5260325f | 1053 | if (len > 0) { |
aa3378df | 1054 | /* Send some data for the other side over the secure connection. */ |
7e7327a1 | 1055 | if (compat20) { |
1056 | if (len > c->remote_window) | |
1057 | len = c->remote_window; | |
1058 | if (len > c->remote_maxpacket) | |
1059 | len = c->remote_maxpacket; | |
5260325f | 1060 | } else { |
7e7327a1 | 1061 | if (packet_is_interactive()) { |
1062 | if (len > 1024) | |
1063 | len = 512; | |
1064 | } else { | |
1065 | /* Keep the packets at reasonable size. */ | |
1066 | if (len > packet_get_maxsize()/2) | |
1067 | len = packet_get_maxsize()/2; | |
1068 | } | |
5260325f | 1069 | } |
7368a6c8 | 1070 | if (len > 0) { |
7e7327a1 | 1071 | packet_start(compat20 ? |
1072 | SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA); | |
7368a6c8 | 1073 | packet_put_int(c->remote_id); |
1074 | packet_put_string(buffer_ptr(&c->input), len); | |
1075 | packet_send(); | |
1076 | buffer_consume(&c->input, len); | |
1077 | c->remote_window -= len; | |
7368a6c8 | 1078 | } |
1079 | } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) { | |
5260325f | 1080 | if (compat13) |
1081 | fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3"); | |
aa3378df | 1082 | /* |
1083 | * input-buffer is empty and read-socket shutdown: | |
1084 | * tell peer, that we will not send more data: send IEOF | |
1085 | */ | |
7368a6c8 | 1086 | chan_ibuf_empty(c); |
5260325f | 1087 | } |
7e7327a1 | 1088 | /* Send extended data, i.e. stderr */ |
1089 | if (compat20 && | |
1090 | c->remote_window > 0 && | |
1091 | (len = buffer_len(&c->extended)) > 0 && | |
1092 | c->extended_usage == CHAN_EXTENDED_READ) { | |
1093 | if (len > c->remote_window) | |
1094 | len = c->remote_window; | |
1095 | if (len > c->remote_maxpacket) | |
1096 | len = c->remote_maxpacket; | |
1097 | packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA); | |
1098 | packet_put_int(c->remote_id); | |
1099 | packet_put_int(SSH2_EXTENDED_DATA_STDERR); | |
1100 | packet_put_string(buffer_ptr(&c->extended), len); | |
1101 | packet_send(); | |
1102 | buffer_consume(&c->extended, len); | |
1103 | c->remote_window -= len; | |
1104 | } | |
8efc0c15 | 1105 | } |
8efc0c15 | 1106 | } |
1107 | ||
aa3378df | 1108 | /* |
1109 | * This is called when a packet of type CHANNEL_DATA has just been received. | |
1110 | * The message type has already been consumed, but channel number and data is | |
1111 | * still there. | |
1112 | */ | |
8efc0c15 | 1113 | |
6ae2364d | 1114 | void |
188adeb2 | 1115 | channel_input_data(int type, int plen, void *ctxt) |
8efc0c15 | 1116 | { |
48e671d5 | 1117 | int id; |
5260325f | 1118 | char *data; |
1e3b8b07 | 1119 | u_int data_len; |
7368a6c8 | 1120 | Channel *c; |
5260325f | 1121 | |
1122 | /* Get the channel number and verify it. */ | |
48e671d5 | 1123 | id = packet_get_int(); |
7368a6c8 | 1124 | c = channel_lookup(id); |
1125 | if (c == NULL) | |
48e671d5 | 1126 | packet_disconnect("Received data for nonexistent channel %d.", id); |
5260325f | 1127 | |
1128 | /* Ignore any data for non-open channels (might happen on close) */ | |
7368a6c8 | 1129 | if (c->type != SSH_CHANNEL_OPEN && |
1130 | c->type != SSH_CHANNEL_X11_OPEN) | |
48e671d5 | 1131 | return; |
1132 | ||
1133 | /* same for protocol 1.5 if output end is no longer open */ | |
7368a6c8 | 1134 | if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN) |
5260325f | 1135 | return; |
1136 | ||
1137 | /* Get the data. */ | |
1138 | data = packet_get_string(&data_len); | |
6ae2364d | 1139 | packet_done(); |
7368a6c8 | 1140 | |
7e7327a1 | 1141 | if (compat20){ |
1142 | if (data_len > c->local_maxpacket) { | |
1143 | log("channel %d: rcvd big packet %d, maxpack %d", | |
1144 | c->self, data_len, c->local_maxpacket); | |
1145 | } | |
1146 | if (data_len > c->local_window) { | |
1147 | log("channel %d: rcvd too much data %d, win %d", | |
1148 | c->self, data_len, c->local_window); | |
1149 | xfree(data); | |
1150 | return; | |
1151 | } | |
1152 | c->local_window -= data_len; | |
1153 | }else{ | |
1154 | packet_integrity_check(plen, 4 + 4 + data_len, type); | |
1155 | } | |
7368a6c8 | 1156 | buffer_append(&c->output, data, data_len); |
5260325f | 1157 | xfree(data); |
8efc0c15 | 1158 | } |
6ae2364d | 1159 | void |
188adeb2 | 1160 | channel_input_extended_data(int type, int plen, void *ctxt) |
7e7327a1 | 1161 | { |
1162 | int id; | |
1163 | int tcode; | |
1164 | char *data; | |
1e3b8b07 | 1165 | u_int data_len; |
7e7327a1 | 1166 | Channel *c; |
1167 | ||
1168 | /* Get the channel number and verify it. */ | |
1169 | id = packet_get_int(); | |
1170 | c = channel_lookup(id); | |
1171 | ||
1172 | if (c == NULL) | |
1173 | packet_disconnect("Received extended_data for bad channel %d.", id); | |
1174 | if (c->type != SSH_CHANNEL_OPEN) { | |
1175 | log("channel %d: ext data for non open", id); | |
1176 | return; | |
1177 | } | |
1178 | tcode = packet_get_int(); | |
1179 | if (c->efd == -1 || | |
1180 | c->extended_usage != CHAN_EXTENDED_WRITE || | |
1181 | tcode != SSH2_EXTENDED_DATA_STDERR) { | |
1182 | log("channel %d: bad ext data", c->self); | |
1183 | return; | |
1184 | } | |
1185 | data = packet_get_string(&data_len); | |
6ae2364d | 1186 | packet_done(); |
7e7327a1 | 1187 | if (data_len > c->local_window) { |
1188 | log("channel %d: rcvd too much extended_data %d, win %d", | |
1189 | c->self, data_len, c->local_window); | |
1190 | xfree(data); | |
1191 | return; | |
1192 | } | |
de273eef | 1193 | debug2("channel %d: rcvd ext data %d", c->self, data_len); |
7e7327a1 | 1194 | c->local_window -= data_len; |
1195 | buffer_append(&c->extended, data, data_len); | |
1196 | xfree(data); | |
1197 | } | |
1198 | ||
8efc0c15 | 1199 | |
aa3378df | 1200 | /* |
1201 | * Returns true if no channel has too much buffered data, and false if one or | |
1202 | * more channel is overfull. | |
1203 | */ | |
8efc0c15 | 1204 | |
6ae2364d | 1205 | int |
5260325f | 1206 | channel_not_very_much_buffered_data() |
8efc0c15 | 1207 | { |
1e3b8b07 | 1208 | u_int i; |
7368a6c8 | 1209 | Channel *c; |
5260325f | 1210 | |
1211 | for (i = 0; i < channels_alloc; i++) { | |
7368a6c8 | 1212 | c = &channels[i]; |
1213 | if (c->type == SSH_CHANNEL_OPEN) { | |
7e7327a1 | 1214 | if (!compat20 && buffer_len(&c->input) > packet_get_maxsize()) { |
7368a6c8 | 1215 | debug("channel %d: big input buffer %d", |
1216 | c->self, buffer_len(&c->input)); | |
5260325f | 1217 | return 0; |
7368a6c8 | 1218 | } |
1219 | if (buffer_len(&c->output) > packet_get_maxsize()) { | |
1220 | debug("channel %d: big output buffer %d", | |
1221 | c->self, buffer_len(&c->output)); | |
5260325f | 1222 | return 0; |
7368a6c8 | 1223 | } |
5260325f | 1224 | } |
8efc0c15 | 1225 | } |
5260325f | 1226 | return 1; |
8efc0c15 | 1227 | } |
1228 | ||
6ae2364d | 1229 | void |
188adeb2 | 1230 | channel_input_ieof(int type, int plen, void *ctxt) |
7368a6c8 | 1231 | { |
1232 | int id; | |
1233 | Channel *c; | |
1234 | ||
1235 | packet_integrity_check(plen, 4, type); | |
1236 | ||
1237 | id = packet_get_int(); | |
1238 | c = channel_lookup(id); | |
1239 | if (c == NULL) | |
1240 | packet_disconnect("Received ieof for nonexistent channel %d.", id); | |
1241 | chan_rcvd_ieof(c); | |
1242 | } | |
8efc0c15 | 1243 | |
6ae2364d | 1244 | void |
188adeb2 | 1245 | channel_input_close(int type, int plen, void *ctxt) |
8efc0c15 | 1246 | { |
7368a6c8 | 1247 | int id; |
1248 | Channel *c; | |
5260325f | 1249 | |
7368a6c8 | 1250 | packet_integrity_check(plen, 4, type); |
1251 | ||
1252 | id = packet_get_int(); | |
1253 | c = channel_lookup(id); | |
1254 | if (c == NULL) | |
1255 | packet_disconnect("Received close for nonexistent channel %d.", id); | |
aa3378df | 1256 | |
1257 | /* | |
1258 | * Send a confirmation that we have closed the channel and no more | |
1259 | * data is coming for it. | |
1260 | */ | |
5260325f | 1261 | packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION); |
7368a6c8 | 1262 | packet_put_int(c->remote_id); |
5260325f | 1263 | packet_send(); |
1264 | ||
aa3378df | 1265 | /* |
1266 | * If the channel is in closed state, we have sent a close request, | |
1267 | * and the other side will eventually respond with a confirmation. | |
1268 | * Thus, we cannot free the channel here, because then there would be | |
1269 | * no-one to receive the confirmation. The channel gets freed when | |
1270 | * the confirmation arrives. | |
1271 | */ | |
7368a6c8 | 1272 | if (c->type != SSH_CHANNEL_CLOSED) { |
aa3378df | 1273 | /* |
1274 | * Not a closed channel - mark it as draining, which will | |
1275 | * cause it to be freed later. | |
1276 | */ | |
7368a6c8 | 1277 | buffer_consume(&c->input, buffer_len(&c->input)); |
1278 | c->type = SSH_CHANNEL_OUTPUT_DRAINING; | |
5260325f | 1279 | } |
8efc0c15 | 1280 | } |
1281 | ||
7368a6c8 | 1282 | /* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */ |
6ae2364d | 1283 | void |
188adeb2 | 1284 | channel_input_oclose(int type, int plen, void *ctxt) |
8efc0c15 | 1285 | { |
7368a6c8 | 1286 | int id = packet_get_int(); |
1287 | Channel *c = channel_lookup(id); | |
1288 | packet_integrity_check(plen, 4, type); | |
1289 | if (c == NULL) | |
1290 | packet_disconnect("Received oclose for nonexistent channel %d.", id); | |
1291 | chan_rcvd_oclose(c); | |
8efc0c15 | 1292 | } |
1293 | ||
6ae2364d | 1294 | void |
188adeb2 | 1295 | channel_input_close_confirmation(int type, int plen, void *ctxt) |
7368a6c8 | 1296 | { |
1297 | int id = packet_get_int(); | |
1298 | Channel *c = channel_lookup(id); | |
1299 | ||
6ae2364d | 1300 | packet_done(); |
7368a6c8 | 1301 | if (c == NULL) |
1302 | packet_disconnect("Received close confirmation for " | |
1303 | "out-of-range channel %d.", id); | |
1304 | if (c->type != SSH_CHANNEL_CLOSED) | |
1305 | packet_disconnect("Received close confirmation for " | |
1306 | "non-closed channel %d (type %d).", id, c->type); | |
1307 | channel_free(c->self); | |
1308 | } | |
8efc0c15 | 1309 | |
6ae2364d | 1310 | void |
188adeb2 | 1311 | channel_input_open_confirmation(int type, int plen, void *ctxt) |
8efc0c15 | 1312 | { |
7368a6c8 | 1313 | int id, remote_id; |
1314 | Channel *c; | |
5260325f | 1315 | |
7e7327a1 | 1316 | if (!compat20) |
1317 | packet_integrity_check(plen, 4 + 4, type); | |
5260325f | 1318 | |
7368a6c8 | 1319 | id = packet_get_int(); |
1320 | c = channel_lookup(id); | |
5260325f | 1321 | |
7368a6c8 | 1322 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) |
1323 | packet_disconnect("Received open confirmation for " | |
1324 | "non-opening channel %d.", id); | |
1325 | remote_id = packet_get_int(); | |
aa3378df | 1326 | /* Record the remote channel number and mark that the channel is now open. */ |
7368a6c8 | 1327 | c->remote_id = remote_id; |
1328 | c->type = SSH_CHANNEL_OPEN; | |
7e7327a1 | 1329 | |
1330 | if (compat20) { | |
1331 | c->remote_window = packet_get_int(); | |
1332 | c->remote_maxpacket = packet_get_int(); | |
6ae2364d | 1333 | packet_done(); |
7e7327a1 | 1334 | if (c->cb_fn != NULL && c->cb_event == type) { |
de273eef | 1335 | debug2("callback start"); |
7e7327a1 | 1336 | c->cb_fn(c->self, c->cb_arg); |
de273eef | 1337 | debug2("callback done"); |
7e7327a1 | 1338 | } |
1339 | debug("channel %d: open confirm rwindow %d rmax %d", c->self, | |
1340 | c->remote_window, c->remote_maxpacket); | |
1341 | } | |
8efc0c15 | 1342 | } |
1343 | ||
6ae2364d | 1344 | void |
188adeb2 | 1345 | channel_input_open_failure(int type, int plen, void *ctxt) |
8efc0c15 | 1346 | { |
02a024dd | 1347 | int id, reason; |
1348 | char *msg = NULL, *lang = NULL; | |
7368a6c8 | 1349 | Channel *c; |
5260325f | 1350 | |
7e7327a1 | 1351 | if (!compat20) |
1352 | packet_integrity_check(plen, 4, type); | |
7368a6c8 | 1353 | |
1354 | id = packet_get_int(); | |
1355 | c = channel_lookup(id); | |
1356 | ||
1357 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) | |
1358 | packet_disconnect("Received open failure for " | |
1359 | "non-opening channel %d.", id); | |
7e7327a1 | 1360 | if (compat20) { |
02a024dd | 1361 | reason = packet_get_int(); |
1362 | if (packet_remaining() > 0) { | |
1363 | msg = packet_get_string(NULL); | |
1364 | lang = packet_get_string(NULL); | |
1365 | } | |
6ae2364d | 1366 | packet_done(); |
02a024dd | 1367 | log("channel_open_failure: %d: reason %d %s", id, |
1368 | reason, msg ? msg : "<no additional info>"); | |
1369 | if (msg != NULL) | |
1370 | xfree(msg); | |
1371 | if (lang != NULL) | |
1372 | xfree(lang); | |
7e7327a1 | 1373 | } |
5260325f | 1374 | /* Free the channel. This will also close the socket. */ |
7368a6c8 | 1375 | channel_free(id); |
8efc0c15 | 1376 | } |
1377 | ||
7e7327a1 | 1378 | void |
188adeb2 | 1379 | channel_input_channel_request(int type, int plen, void *ctxt) |
7e7327a1 | 1380 | { |
1381 | int id; | |
1382 | Channel *c; | |
1383 | ||
1384 | id = packet_get_int(); | |
1385 | c = channel_lookup(id); | |
1386 | ||
1387 | if (c == NULL || | |
1388 | (c->type != SSH_CHANNEL_OPEN && c->type != SSH_CHANNEL_LARVAL)) | |
1389 | packet_disconnect("Received request for " | |
1390 | "non-open channel %d.", id); | |
1391 | if (c->cb_fn != NULL && c->cb_event == type) { | |
de273eef | 1392 | debug2("callback start"); |
7e7327a1 | 1393 | c->cb_fn(c->self, c->cb_arg); |
de273eef | 1394 | debug2("callback done"); |
7e7327a1 | 1395 | } else { |
1396 | char *service = packet_get_string(NULL); | |
1397 | debug("channel: %d rcvd request for %s", c->self, service); | |
de273eef | 1398 | debug("cb_fn %p cb_event %d", c->cb_fn , c->cb_event); |
7e7327a1 | 1399 | xfree(service); |
1400 | } | |
1401 | } | |
1402 | ||
6ae2364d | 1403 | void |
188adeb2 | 1404 | channel_input_window_adjust(int type, int plen, void *ctxt) |
7e7327a1 | 1405 | { |
1406 | Channel *c; | |
1407 | int id, adjust; | |
1408 | ||
1409 | if (!compat20) | |
1410 | return; | |
1411 | ||
1412 | /* Get the channel number and verify it. */ | |
1413 | id = packet_get_int(); | |
1414 | c = channel_lookup(id); | |
1415 | ||
1416 | if (c == NULL || c->type != SSH_CHANNEL_OPEN) { | |
1417 | log("Received window adjust for " | |
1418 | "non-open channel %d.", id); | |
1419 | return; | |
1420 | } | |
1421 | adjust = packet_get_int(); | |
6ae2364d | 1422 | packet_done(); |
de273eef | 1423 | debug2("channel %d: rcvd adjust %d", id, adjust); |
7e7327a1 | 1424 | c->remote_window += adjust; |
1425 | } | |
1426 | ||
aa3378df | 1427 | /* |
1428 | * Stops listening for channels, and removes any unix domain sockets that we | |
1429 | * might have. | |
1430 | */ | |
8efc0c15 | 1431 | |
6ae2364d | 1432 | void |
5260325f | 1433 | channel_stop_listening() |
8efc0c15 | 1434 | { |
5260325f | 1435 | int i; |
1436 | for (i = 0; i < channels_alloc; i++) { | |
1437 | switch (channels[i].type) { | |
1438 | case SSH_CHANNEL_AUTH_SOCKET: | |
1439 | close(channels[i].sock); | |
77bb0bca | 1440 | unlink(channels[i].path); |
5260325f | 1441 | channel_free(i); |
1442 | break; | |
1443 | case SSH_CHANNEL_PORT_LISTENER: | |
fa08c86b | 1444 | case SSH_CHANNEL_RPORT_LISTENER: |
5260325f | 1445 | case SSH_CHANNEL_X11_LISTENER: |
1446 | close(channels[i].sock); | |
1447 | channel_free(i); | |
1448 | break; | |
1449 | default: | |
1450 | break; | |
1451 | } | |
8efc0c15 | 1452 | } |
8efc0c15 | 1453 | } |
1454 | ||
aa3378df | 1455 | /* |
0fbe8c74 | 1456 | * Closes the sockets/fds of all channels. This is used to close extra file |
aa3378df | 1457 | * descriptors after a fork. |
1458 | */ | |
8efc0c15 | 1459 | |
6ae2364d | 1460 | void |
5260325f | 1461 | channel_close_all() |
8efc0c15 | 1462 | { |
5260325f | 1463 | int i; |
0fbe8c74 | 1464 | for (i = 0; i < channels_alloc; i++) |
5260325f | 1465 | if (channels[i].type != SSH_CHANNEL_FREE) |
0fbe8c74 | 1466 | channel_close_fds(&channels[i]); |
8efc0c15 | 1467 | } |
1468 | ||
8efc0c15 | 1469 | /* Returns true if any channel is still open. */ |
1470 | ||
6ae2364d | 1471 | int |
5260325f | 1472 | channel_still_open() |
8efc0c15 | 1473 | { |
1e3b8b07 | 1474 | u_int i; |
5260325f | 1475 | for (i = 0; i < channels_alloc; i++) |
1476 | switch (channels[i].type) { | |
1477 | case SSH_CHANNEL_FREE: | |
1478 | case SSH_CHANNEL_X11_LISTENER: | |
1479 | case SSH_CHANNEL_PORT_LISTENER: | |
fa08c86b | 1480 | case SSH_CHANNEL_RPORT_LISTENER: |
5260325f | 1481 | case SSH_CHANNEL_CLOSED: |
1482 | case SSH_CHANNEL_AUTH_SOCKET: | |
97fb6912 | 1483 | case SSH_CHANNEL_CONNECTING: /* XXX ??? */ |
5260325f | 1484 | continue; |
7e7327a1 | 1485 | case SSH_CHANNEL_LARVAL: |
1486 | if (!compat20) | |
1487 | fatal("cannot happen: SSH_CHANNEL_LARVAL"); | |
1488 | continue; | |
5260325f | 1489 | case SSH_CHANNEL_OPENING: |
1490 | case SSH_CHANNEL_OPEN: | |
1491 | case SSH_CHANNEL_X11_OPEN: | |
1492 | return 1; | |
1493 | case SSH_CHANNEL_INPUT_DRAINING: | |
1494 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
1495 | if (!compat13) | |
1496 | fatal("cannot happen: OUT_DRAIN"); | |
1497 | return 1; | |
1498 | default: | |
1499 | fatal("channel_still_open: bad channel type %d", channels[i].type); | |
1500 | /* NOTREACHED */ | |
1501 | } | |
1502 | return 0; | |
8efc0c15 | 1503 | } |
1504 | ||
aa3378df | 1505 | /* |
1506 | * Returns a message describing the currently open forwarded connections, | |
1507 | * suitable for sending to the client. The message contains crlf pairs for | |
1508 | * newlines. | |
1509 | */ | |
8efc0c15 | 1510 | |
5260325f | 1511 | char * |
1512 | channel_open_message() | |
8efc0c15 | 1513 | { |
5260325f | 1514 | Buffer buffer; |
1515 | int i; | |
1516 | char buf[512], *cp; | |
1517 | ||
1518 | buffer_init(&buffer); | |
1519 | snprintf(buf, sizeof buf, "The following connections are open:\r\n"); | |
8efc0c15 | 1520 | buffer_append(&buffer, buf, strlen(buf)); |
5260325f | 1521 | for (i = 0; i < channels_alloc; i++) { |
1522 | Channel *c = &channels[i]; | |
1523 | switch (c->type) { | |
1524 | case SSH_CHANNEL_FREE: | |
1525 | case SSH_CHANNEL_X11_LISTENER: | |
1526 | case SSH_CHANNEL_PORT_LISTENER: | |
fa08c86b | 1527 | case SSH_CHANNEL_RPORT_LISTENER: |
5260325f | 1528 | case SSH_CHANNEL_CLOSED: |
1529 | case SSH_CHANNEL_AUTH_SOCKET: | |
1530 | continue; | |
7e7327a1 | 1531 | case SSH_CHANNEL_LARVAL: |
5260325f | 1532 | case SSH_CHANNEL_OPENING: |
97fb6912 | 1533 | case SSH_CHANNEL_CONNECTING: |
5260325f | 1534 | case SSH_CHANNEL_OPEN: |
1535 | case SSH_CHANNEL_X11_OPEN: | |
1536 | case SSH_CHANNEL_INPUT_DRAINING: | |
1537 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
7368a6c8 | 1538 | snprintf(buf, sizeof buf, " #%d %.300s (t%d r%d i%d/%d o%d/%d fd %d/%d)\r\n", |
48e671d5 | 1539 | c->self, c->remote_name, |
1540 | c->type, c->remote_id, | |
1541 | c->istate, buffer_len(&c->input), | |
7368a6c8 | 1542 | c->ostate, buffer_len(&c->output), |
1543 | c->rfd, c->wfd); | |
5260325f | 1544 | buffer_append(&buffer, buf, strlen(buf)); |
1545 | continue; | |
1546 | default: | |
7368a6c8 | 1547 | fatal("channel_open_message: bad channel type %d", c->type); |
5260325f | 1548 | /* NOTREACHED */ |
1549 | } | |
1550 | } | |
1551 | buffer_append(&buffer, "\0", 1); | |
1552 | cp = xstrdup(buffer_ptr(&buffer)); | |
1553 | buffer_free(&buffer); | |
1554 | return cp; | |
8efc0c15 | 1555 | } |
1556 | ||
aa3378df | 1557 | /* |
1558 | * Initiate forwarding of connections to local port "port" through the secure | |
1559 | * channel to host:port from remote side. | |
1560 | */ | |
02a024dd | 1561 | int |
fa08c86b | 1562 | channel_request_local_forwarding(u_short listen_port, const char *host_to_connect, |
1563 | u_short port_to_connect, int gateway_ports) | |
1564 | { | |
02a024dd | 1565 | return channel_request_forwarding( |
fa08c86b | 1566 | NULL, listen_port, |
1567 | host_to_connect, port_to_connect, | |
1568 | gateway_ports, /*remote_fwd*/ 0); | |
1569 | } | |
8efc0c15 | 1570 | |
fa08c86b | 1571 | /* |
1572 | * If 'remote_fwd' is true we have a '-R style' listener for protocol 2 | |
1573 | * (SSH_CHANNEL_RPORT_LISTENER). | |
1574 | */ | |
02a024dd | 1575 | int |
fa08c86b | 1576 | channel_request_forwarding( |
1577 | const char *listen_address, u_short listen_port, | |
1578 | const char *host_to_connect, u_short port_to_connect, | |
1579 | int gateway_ports, int remote_fwd) | |
8efc0c15 | 1580 | { |
fa08c86b | 1581 | int success, ch, sock, on = 1, ctype; |
48e671d5 | 1582 | struct addrinfo hints, *ai, *aitop; |
1583 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; | |
fa08c86b | 1584 | const char *host; |
aa3378df | 1585 | struct linger linger; |
5260325f | 1586 | |
02a024dd | 1587 | success = 0; |
1588 | ||
fa08c86b | 1589 | if (remote_fwd) { |
1590 | host = listen_address; | |
2b87da3b | 1591 | ctype = SSH_CHANNEL_RPORT_LISTENER; |
fa08c86b | 1592 | } else { |
1593 | host = host_to_connect; | |
1594 | ctype =SSH_CHANNEL_PORT_LISTENER; | |
1595 | } | |
1596 | ||
02a024dd | 1597 | if (strlen(host) > sizeof(channels[0].path) - 1) { |
1598 | error("Forward host name too long."); | |
1599 | return success; | |
1600 | } | |
5260325f | 1601 | |
fa08c86b | 1602 | /* XXX listen_address is currently ignored */ |
aa3378df | 1603 | /* |
48e671d5 | 1604 | * getaddrinfo returns a loopback address if the hostname is |
1605 | * set to NULL and hints.ai_flags is not AI_PASSIVE | |
aa3378df | 1606 | */ |
48e671d5 | 1607 | memset(&hints, 0, sizeof(hints)); |
1608 | hints.ai_family = IPv4or6; | |
1609 | hints.ai_flags = gateway_ports ? AI_PASSIVE : 0; | |
1610 | hints.ai_socktype = SOCK_STREAM; | |
fa08c86b | 1611 | snprintf(strport, sizeof strport, "%d", listen_port); |
48e671d5 | 1612 | if (getaddrinfo(NULL, strport, &hints, &aitop) != 0) |
1613 | packet_disconnect("getaddrinfo: fatal error"); | |
1614 | ||
48e671d5 | 1615 | for (ai = aitop; ai; ai = ai->ai_next) { |
1616 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
1617 | continue; | |
1618 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), | |
1619 | strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { | |
fa08c86b | 1620 | error("channel_request_forwarding: getnameinfo failed"); |
48e671d5 | 1621 | continue; |
1622 | } | |
1623 | /* Create a port to listen for the host. */ | |
1624 | sock = socket(ai->ai_family, SOCK_STREAM, 0); | |
1625 | if (sock < 0) { | |
1626 | /* this is no error since kernel may not support ipv6 */ | |
1627 | verbose("socket: %.100s", strerror(errno)); | |
1628 | continue; | |
1629 | } | |
1630 | /* | |
1631 | * Set socket options. We would like the socket to disappear | |
1632 | * as soon as it has been closed for whatever reason. | |
1633 | */ | |
1634 | setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void *)&on, sizeof(on)); | |
1635 | linger.l_onoff = 1; | |
1636 | linger.l_linger = 5; | |
1637 | setsockopt(sock, SOL_SOCKET, SO_LINGER, (void *)&linger, sizeof(linger)); | |
1638 | debug("Local forwarding listening on %s port %s.", ntop, strport); | |
1639 | ||
1640 | /* Bind the socket to the address. */ | |
1641 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { | |
1642 | /* address can be in use ipv6 address is already bound */ | |
16218745 | 1643 | if (!ai->ai_next) |
1644 | error("bind: %.100s", strerror(errno)); | |
1645 | else | |
1646 | verbose("bind: %.100s", strerror(errno)); | |
2b87da3b | 1647 | |
48e671d5 | 1648 | close(sock); |
1649 | continue; | |
1650 | } | |
1651 | /* Start listening for connections on the socket. */ | |
1652 | if (listen(sock, 5) < 0) { | |
1653 | error("listen: %.100s", strerror(errno)); | |
1654 | close(sock); | |
1655 | continue; | |
1656 | } | |
1657 | /* Allocate a channel number for the socket. */ | |
fa08c86b | 1658 | ch = channel_new("port listener", ctype, sock, sock, -1, |
0b242b12 | 1659 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, |
a22aff1f | 1660 | 0, xstrdup("port listener"), 1); |
48e671d5 | 1661 | strlcpy(channels[ch].path, host, sizeof(channels[ch].path)); |
fa08c86b | 1662 | channels[ch].host_port = port_to_connect; |
1663 | channels[ch].listening_port = listen_port; | |
48e671d5 | 1664 | success = 1; |
1665 | } | |
1666 | if (success == 0) | |
02a024dd | 1667 | error("channel_request_forwarding: cannot listen to port: %d", |
1668 | listen_port); | |
48e671d5 | 1669 | freeaddrinfo(aitop); |
02a024dd | 1670 | return success; |
5260325f | 1671 | } |
8efc0c15 | 1672 | |
aa3378df | 1673 | /* |
1674 | * Initiate forwarding of connections to port "port" on remote host through | |
1675 | * the secure channel to host:port from local side. | |
1676 | */ | |
8efc0c15 | 1677 | |
6ae2364d | 1678 | void |
fa08c86b | 1679 | channel_request_remote_forwarding(u_short listen_port, |
1680 | const char *host_to_connect, u_short port_to_connect) | |
8efc0c15 | 1681 | { |
fa08c86b | 1682 | int payload_len, type, success = 0; |
1683 | ||
5260325f | 1684 | /* Record locally that connection to this host/port is permitted. */ |
1685 | if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
1686 | fatal("channel_request_remote_forwarding: too many forwards"); | |
1687 | ||
5260325f | 1688 | /* Send the forward request to the remote side. */ |
7e7327a1 | 1689 | if (compat20) { |
1690 | const char *address_to_bind = "0.0.0.0"; | |
1691 | packet_start(SSH2_MSG_GLOBAL_REQUEST); | |
1692 | packet_put_cstring("tcpip-forward"); | |
1693 | packet_put_char(0); /* boolean: want reply */ | |
1694 | packet_put_cstring(address_to_bind); | |
1695 | packet_put_int(listen_port); | |
fa08c86b | 1696 | packet_send(); |
1697 | packet_write_wait(); | |
1698 | /* Assume that server accepts the request */ | |
1699 | success = 1; | |
7e7327a1 | 1700 | } else { |
1701 | packet_start(SSH_CMSG_PORT_FORWARD_REQUEST); | |
7e7327a1 | 1702 | packet_put_int(listen_port); |
d6f24e45 | 1703 | packet_put_cstring(host_to_connect); |
1704 | packet_put_int(port_to_connect); | |
7e7327a1 | 1705 | packet_send(); |
1706 | packet_write_wait(); | |
fa08c86b | 1707 | |
1708 | /* Wait for response from the remote side. */ | |
1709 | type = packet_read(&payload_len); | |
1710 | switch (type) { | |
1711 | case SSH_SMSG_SUCCESS: | |
1712 | success = 1; | |
1713 | break; | |
1714 | case SSH_SMSG_FAILURE: | |
1715 | log("Warning: Server denied remote port forwarding."); | |
1716 | break; | |
1717 | default: | |
1718 | /* Unknown packet */ | |
1719 | packet_disconnect("Protocol error for port forward request:" | |
1720 | "received packet type %d.", type); | |
1721 | } | |
1722 | } | |
1723 | if (success) { | |
1724 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host_to_connect); | |
1725 | permitted_opens[num_permitted_opens].port_to_connect = port_to_connect; | |
1726 | permitted_opens[num_permitted_opens].listen_port = listen_port; | |
1727 | num_permitted_opens++; | |
7e7327a1 | 1728 | } |
8efc0c15 | 1729 | } |
1730 | ||
aa3378df | 1731 | /* |
1732 | * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates | |
1733 | * listening for the port, and sends back a success reply (or disconnect | |
1734 | * message if there was an error). This never returns if there was an error. | |
1735 | */ | |
8efc0c15 | 1736 | |
6ae2364d | 1737 | void |
1d1ffb87 | 1738 | channel_input_port_forward_request(int is_root, int gateway_ports) |
8efc0c15 | 1739 | { |
57112b5a | 1740 | u_short port, host_port; |
5260325f | 1741 | char *hostname; |
1742 | ||
1743 | /* Get arguments from the packet. */ | |
1744 | port = packet_get_int(); | |
1745 | hostname = packet_get_string(NULL); | |
1746 | host_port = packet_get_int(); | |
1747 | ||
3c62e7eb | 1748 | #ifndef HAVE_CYGWIN |
aa3378df | 1749 | /* |
1750 | * Check that an unprivileged user is not trying to forward a | |
1751 | * privileged port. | |
1752 | */ | |
5260325f | 1753 | if (port < IPPORT_RESERVED && !is_root) |
1754 | packet_disconnect("Requested forwarding of port %d but user is not root.", | |
1755 | port); | |
3c62e7eb | 1756 | #endif |
fa08c86b | 1757 | /* Initiate forwarding */ |
1d1ffb87 | 1758 | channel_request_local_forwarding(port, hostname, host_port, gateway_ports); |
5260325f | 1759 | |
1760 | /* Free the argument string. */ | |
1761 | xfree(hostname); | |
8efc0c15 | 1762 | } |
1763 | ||
7368a6c8 | 1764 | /* XXX move to aux.c */ |
1765 | int | |
1766 | channel_connect_to(const char *host, u_short host_port) | |
8efc0c15 | 1767 | { |
48e671d5 | 1768 | struct addrinfo hints, *ai, *aitop; |
1769 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; | |
1770 | int gaierr; | |
7368a6c8 | 1771 | int sock = -1; |
48e671d5 | 1772 | |
1773 | memset(&hints, 0, sizeof(hints)); | |
1774 | hints.ai_family = IPv4or6; | |
1775 | hints.ai_socktype = SOCK_STREAM; | |
1776 | snprintf(strport, sizeof strport, "%d", host_port); | |
1777 | if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) { | |
1778 | error("%.100s: unknown host (%s)", host, gai_strerror(gaierr)); | |
7368a6c8 | 1779 | return -1; |
48e671d5 | 1780 | } |
48e671d5 | 1781 | for (ai = aitop; ai; ai = ai->ai_next) { |
1782 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
1783 | continue; | |
1784 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), | |
1785 | strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { | |
7368a6c8 | 1786 | error("channel_connect_to: getnameinfo failed"); |
48e671d5 | 1787 | continue; |
5260325f | 1788 | } |
48e671d5 | 1789 | /* Create the socket. */ |
1790 | sock = socket(ai->ai_family, SOCK_STREAM, 0); | |
1791 | if (sock < 0) { | |
1792 | error("socket: %.100s", strerror(errno)); | |
1793 | continue; | |
5260325f | 1794 | } |
eea39c02 | 1795 | if (fcntl(sock, F_SETFL, O_NONBLOCK) < 0) |
97fb6912 | 1796 | fatal("connect_to: F_SETFL: %s", strerror(errno)); |
48e671d5 | 1797 | /* Connect to the host/port. */ |
97fb6912 | 1798 | if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0 && |
1799 | errno != EINPROGRESS) { | |
48e671d5 | 1800 | error("connect %.100s port %s: %.100s", ntop, strport, |
1801 | strerror(errno)); | |
1802 | close(sock); | |
2b87da3b | 1803 | continue; /* fail -- try next */ |
48e671d5 | 1804 | } |
1805 | break; /* success */ | |
5260325f | 1806 | |
5260325f | 1807 | } |
48e671d5 | 1808 | freeaddrinfo(aitop); |
48e671d5 | 1809 | if (!ai) { |
2b87da3b | 1810 | error("connect %.100s port %d: failed.", host, host_port); |
7368a6c8 | 1811 | return -1; |
8efc0c15 | 1812 | } |
7368a6c8 | 1813 | /* success */ |
1814 | return sock; | |
1815 | } | |
fa08c86b | 1816 | int |
1817 | channel_connect_by_listen_adress(u_short listen_port) | |
1818 | { | |
1819 | int i; | |
1820 | for (i = 0; i < num_permitted_opens; i++) | |
1821 | if (permitted_opens[i].listen_port == listen_port) | |
1822 | return channel_connect_to( | |
1823 | permitted_opens[i].host_to_connect, | |
1824 | permitted_opens[i].port_to_connect); | |
0b6fbf03 | 1825 | error("WARNING: Server requests forwarding for unknown listen_port %d", |
1826 | listen_port); | |
fa08c86b | 1827 | return -1; |
1828 | } | |
48e671d5 | 1829 | |
7368a6c8 | 1830 | /* |
1831 | * This is called after receiving PORT_OPEN message. This attempts to | |
1832 | * connect to the given host:port, and sends back CHANNEL_OPEN_CONFIRMATION | |
1833 | * or CHANNEL_OPEN_FAILURE. | |
1834 | */ | |
5260325f | 1835 | |
6ae2364d | 1836 | void |
188adeb2 | 1837 | channel_input_port_open(int type, int plen, void *ctxt) |
7368a6c8 | 1838 | { |
1839 | u_short host_port; | |
1840 | char *host, *originator_string; | |
1841 | int remote_channel, sock = -1, newch, i, denied; | |
1e3b8b07 | 1842 | u_int host_len, originator_len; |
5260325f | 1843 | |
7368a6c8 | 1844 | /* Get remote channel number. */ |
1845 | remote_channel = packet_get_int(); | |
5260325f | 1846 | |
7368a6c8 | 1847 | /* Get host name to connect to. */ |
1848 | host = packet_get_string(&host_len); | |
5260325f | 1849 | |
7368a6c8 | 1850 | /* Get port to connect to. */ |
1851 | host_port = packet_get_int(); | |
5260325f | 1852 | |
7368a6c8 | 1853 | /* Get remote originator name. */ |
1854 | if (have_hostname_in_open) { | |
1855 | originator_string = packet_get_string(&originator_len); | |
1856 | originator_len += 4; /* size of packet_int */ | |
1857 | } else { | |
1858 | originator_string = xstrdup("unknown (remote did not supply name)"); | |
1859 | originator_len = 0; /* no originator supplied */ | |
1860 | } | |
5260325f | 1861 | |
7368a6c8 | 1862 | packet_integrity_check(plen, |
1863 | 4 + 4 + host_len + 4 + originator_len, SSH_MSG_PORT_OPEN); | |
1864 | ||
1865 | /* Check if opening that port is permitted. */ | |
1866 | denied = 0; | |
1867 | if (!all_opens_permitted) { | |
1868 | /* Go trough all permitted ports. */ | |
1869 | for (i = 0; i < num_permitted_opens; i++) | |
1870 | if (permitted_opens[i].port_to_connect == host_port && | |
1871 | strcmp(permitted_opens[i].host_to_connect, host) == 0) | |
1872 | break; | |
1873 | ||
1874 | /* Check if we found the requested port among those permitted. */ | |
1875 | if (i >= num_permitted_opens) { | |
1876 | /* The port is not permitted. */ | |
1877 | log("Received request to connect to %.100s:%d, but the request was denied.", | |
1878 | host, host_port); | |
1879 | denied = 1; | |
1880 | } | |
1881 | } | |
1882 | sock = denied ? -1 : channel_connect_to(host, host_port); | |
1883 | if (sock > 0) { | |
1884 | /* Allocate a channel for this connection. */ | |
97fb6912 | 1885 | newch = channel_allocate(SSH_CHANNEL_CONNECTING, |
1886 | sock, originator_string); | |
1887 | /*XXX delay answer? */ | |
7368a6c8 | 1888 | channels[newch].remote_id = remote_channel; |
1889 | ||
1890 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1891 | packet_put_int(remote_channel); | |
1892 | packet_put_int(newch); | |
1893 | packet_send(); | |
1894 | } else { | |
1895 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
1896 | packet_put_int(remote_channel); | |
1897 | packet_send(); | |
1898 | } | |
1899 | xfree(host); | |
8efc0c15 | 1900 | } |
1901 | ||
aa3378df | 1902 | /* |
1903 | * Creates an internet domain socket for listening for X11 connections. | |
1904 | * Returns a suitable value for the DISPLAY variable, or NULL if an error | |
1905 | * occurs. | |
1906 | */ | |
8efc0c15 | 1907 | |
48e671d5 | 1908 | #define NUM_SOCKS 10 |
1909 | ||
5260325f | 1910 | char * |
95f1eccc | 1911 | x11_create_display_inet(int screen_number, int x11_display_offset) |
8efc0c15 | 1912 | { |
57112b5a | 1913 | int display_number, sock; |
1914 | u_short port; | |
48e671d5 | 1915 | struct addrinfo hints, *ai, *aitop; |
1916 | char strport[NI_MAXSERV]; | |
1917 | int gaierr, n, num_socks = 0, socks[NUM_SOCKS]; | |
1918 | char display[512]; | |
5260325f | 1919 | char hostname[MAXHOSTNAMELEN]; |
1920 | ||
95f1eccc | 1921 | for (display_number = x11_display_offset; |
5260325f | 1922 | display_number < MAX_DISPLAYS; |
1923 | display_number++) { | |
1924 | port = 6000 + display_number; | |
48e671d5 | 1925 | memset(&hints, 0, sizeof(hints)); |
1926 | hints.ai_family = IPv4or6; | |
1927 | hints.ai_flags = AI_PASSIVE; /* XXX loopback only ? */ | |
1928 | hints.ai_socktype = SOCK_STREAM; | |
1929 | snprintf(strport, sizeof strport, "%d", port); | |
1930 | if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) { | |
1931 | error("getaddrinfo: %.100s", gai_strerror(gaierr)); | |
5260325f | 1932 | return NULL; |
1933 | } | |
48e671d5 | 1934 | for (ai = aitop; ai; ai = ai->ai_next) { |
1935 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
1936 | continue; | |
1937 | sock = socket(ai->ai_family, SOCK_STREAM, 0); | |
1938 | if (sock < 0) { | |
4ee81249 | 1939 | if ((errno != EINVAL) && (errno != EAFNOSUPPORT)) { |
80a44451 | 1940 | error("socket: %.100s", strerror(errno)); |
1941 | return NULL; | |
1942 | } else { | |
22d89d24 | 1943 | debug("x11_create_display_inet: Socket family %d not supported", |
1944 | ai->ai_family); | |
80a44451 | 1945 | continue; |
1946 | } | |
48e671d5 | 1947 | } |
1948 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { | |
1949 | debug("bind port %d: %.100s", port, strerror(errno)); | |
1950 | shutdown(sock, SHUT_RDWR); | |
1951 | close(sock); | |
16218745 | 1952 | |
1953 | if (ai->ai_next) | |
1954 | continue; | |
1955 | ||
48e671d5 | 1956 | for (n = 0; n < num_socks; n++) { |
1957 | shutdown(socks[n], SHUT_RDWR); | |
1958 | close(socks[n]); | |
1959 | } | |
1960 | num_socks = 0; | |
1961 | break; | |
1962 | } | |
1963 | socks[num_socks++] = sock; | |
80faa19f | 1964 | #ifndef DONT_TRY_OTHER_AF |
48e671d5 | 1965 | if (num_socks == NUM_SOCKS) |
1966 | break; | |
80faa19f | 1967 | #else |
1968 | break; | |
1969 | #endif | |
5260325f | 1970 | } |
4ccb01d6 | 1971 | freeaddrinfo(aitop); |
48e671d5 | 1972 | if (num_socks > 0) |
1973 | break; | |
5260325f | 1974 | } |
1975 | if (display_number >= MAX_DISPLAYS) { | |
1976 | error("Failed to allocate internet-domain X11 display socket."); | |
1977 | return NULL; | |
8efc0c15 | 1978 | } |
5260325f | 1979 | /* Start listening for connections on the socket. */ |
48e671d5 | 1980 | for (n = 0; n < num_socks; n++) { |
1981 | sock = socks[n]; | |
1982 | if (listen(sock, 5) < 0) { | |
1983 | error("listen: %.100s", strerror(errno)); | |
1984 | shutdown(sock, SHUT_RDWR); | |
1985 | close(sock); | |
1986 | return NULL; | |
1987 | } | |
8efc0c15 | 1988 | } |
48e671d5 | 1989 | |
5260325f | 1990 | /* Set up a suitable value for the DISPLAY variable. */ |
1991 | if (gethostname(hostname, sizeof(hostname)) < 0) | |
1992 | fatal("gethostname: %.100s", strerror(errno)); | |
a7effaac | 1993 | |
1994 | #ifdef IPADDR_IN_DISPLAY | |
2b87da3b | 1995 | /* |
a7effaac | 1996 | * HPUX detects the local hostname in the DISPLAY variable and tries |
1997 | * to set up a shared memory connection to the server, which it | |
1998 | * incorrectly supposes to be local. | |
1999 | * | |
2000 | * The workaround - as used in later $$H and other programs - is | |
2001 | * is to set display to the host's IP address. | |
2002 | */ | |
2003 | { | |
2004 | struct hostent *he; | |
2005 | struct in_addr my_addr; | |
2006 | ||
2007 | he = gethostbyname(hostname); | |
2008 | if (he == NULL) { | |
2009 | error("[X11-broken-fwd-hostname-workaround] Could not get " | |
2010 | "IP address for hostname %s.", hostname); | |
2011 | ||
2012 | packet_send_debug("[X11-broken-fwd-hostname-workaround]" | |
2013 | "Could not get IP address for hostname %s.", hostname); | |
2014 | ||
2015 | shutdown(sock, SHUT_RDWR); | |
2016 | close(sock); | |
2017 | ||
2018 | return NULL; | |
2019 | } | |
2020 | ||
2021 | memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr)); | |
2022 | ||
2023 | /* Set DISPLAY to <ip address>:screen.display */ | |
2b87da3b | 2024 | snprintf(display, sizeof(display), "%.50s:%d.%d", inet_ntoa(my_addr), |
74141647 | 2025 | display_number, screen_number); |
a7effaac | 2026 | } |
2027 | #else /* IPADDR_IN_DISPLAY */ | |
2028 | /* Just set DISPLAY to hostname:screen.display */ | |
48e671d5 | 2029 | snprintf(display, sizeof display, "%.400s:%d.%d", hostname, |
74141647 | 2030 | display_number, screen_number); |
a7effaac | 2031 | #endif /* IPADDR_IN_DISPLAY */ |
5260325f | 2032 | |
48e671d5 | 2033 | /* Allocate a channel for each socket. */ |
2034 | for (n = 0; n < num_socks; n++) { | |
2035 | sock = socks[n]; | |
0b242b12 | 2036 | (void) channel_new("x11 listener", |
2037 | SSH_CHANNEL_X11_LISTENER, sock, sock, -1, | |
2038 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, | |
a22aff1f | 2039 | 0, xstrdup("X11 inet listener"), 1); |
48e671d5 | 2040 | } |
5260325f | 2041 | |
2042 | /* Return a suitable value for the DISPLAY environment variable. */ | |
48e671d5 | 2043 | return xstrdup(display); |
8efc0c15 | 2044 | } |
2045 | ||
2046 | #ifndef X_UNIX_PATH | |
2047 | #define X_UNIX_PATH "/tmp/.X11-unix/X" | |
2048 | #endif | |
2049 | ||
2050 | static | |
2051 | int | |
1e3b8b07 | 2052 | connect_local_xsocket(u_int dnr) |
8efc0c15 | 2053 | { |
5260325f | 2054 | static const char *const x_sockets[] = { |
2055 | X_UNIX_PATH "%u", | |
2056 | "/var/X/.X11-unix/X" "%u", | |
2057 | "/usr/spool/sockets/X11/" "%u", | |
2058 | NULL | |
2059 | }; | |
2060 | int sock; | |
2061 | struct sockaddr_un addr; | |
2062 | const char *const * path; | |
2063 | ||
2064 | for (path = x_sockets; *path; ++path) { | |
2065 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
2066 | if (sock < 0) | |
2067 | error("socket: %.100s", strerror(errno)); | |
2068 | memset(&addr, 0, sizeof(addr)); | |
2069 | addr.sun_family = AF_UNIX; | |
2070 | snprintf(addr.sun_path, sizeof addr.sun_path, *path, dnr); | |
2071 | if (connect(sock, (struct sockaddr *) & addr, sizeof(addr)) == 0) | |
2072 | return sock; | |
2073 | close(sock); | |
2074 | } | |
2075 | error("connect %.100s: %.100s", addr.sun_path, strerror(errno)); | |
2076 | return -1; | |
8efc0c15 | 2077 | } |
2078 | ||
0b242b12 | 2079 | int |
2080 | x11_connect_display(void) | |
8efc0c15 | 2081 | { |
0b242b12 | 2082 | int display_number, sock = 0; |
5260325f | 2083 | const char *display; |
0b242b12 | 2084 | char buf[1024], *cp; |
48e671d5 | 2085 | struct addrinfo hints, *ai, *aitop; |
2086 | char strport[NI_MAXSERV]; | |
2087 | int gaierr; | |
5260325f | 2088 | |
5260325f | 2089 | /* Try to open a socket for the local X server. */ |
2090 | display = getenv("DISPLAY"); | |
2091 | if (!display) { | |
2092 | error("DISPLAY not set."); | |
0b242b12 | 2093 | return -1; |
5260325f | 2094 | } |
aa3378df | 2095 | /* |
2096 | * Now we decode the value of the DISPLAY variable and make a | |
2097 | * connection to the real X server. | |
2098 | */ | |
2099 | ||
2100 | /* | |
2101 | * Check if it is a unix domain socket. Unix domain displays are in | |
2102 | * one of the following formats: unix:d[.s], :d[.s], ::d[.s] | |
2103 | */ | |
5260325f | 2104 | if (strncmp(display, "unix:", 5) == 0 || |
2105 | display[0] == ':') { | |
2106 | /* Connect to the unix domain socket. */ | |
2107 | if (sscanf(strrchr(display, ':') + 1, "%d", &display_number) != 1) { | |
2108 | error("Could not parse display number from DISPLAY: %.100s", | |
2109 | display); | |
0b242b12 | 2110 | return -1; |
5260325f | 2111 | } |
2112 | /* Create a socket. */ | |
2113 | sock = connect_local_xsocket(display_number); | |
2114 | if (sock < 0) | |
0b242b12 | 2115 | return -1; |
5260325f | 2116 | |
2117 | /* OK, we now have a connection to the display. */ | |
0b242b12 | 2118 | return sock; |
5260325f | 2119 | } |
aa3378df | 2120 | /* |
2121 | * Connect to an inet socket. The DISPLAY value is supposedly | |
2122 | * hostname:d[.s], where hostname may also be numeric IP address. | |
2123 | */ | |
5260325f | 2124 | strncpy(buf, display, sizeof(buf)); |
2125 | buf[sizeof(buf) - 1] = 0; | |
2126 | cp = strchr(buf, ':'); | |
2127 | if (!cp) { | |
2128 | error("Could not find ':' in DISPLAY: %.100s", display); | |
0b242b12 | 2129 | return -1; |
5260325f | 2130 | } |
2131 | *cp = 0; | |
aa3378df | 2132 | /* buf now contains the host name. But first we parse the display number. */ |
5260325f | 2133 | if (sscanf(cp + 1, "%d", &display_number) != 1) { |
2134 | error("Could not parse display number from DISPLAY: %.100s", | |
2135 | display); | |
0b242b12 | 2136 | return -1; |
5260325f | 2137 | } |
5260325f | 2138 | |
48e671d5 | 2139 | /* Look up the host address */ |
2140 | memset(&hints, 0, sizeof(hints)); | |
2141 | hints.ai_family = IPv4or6; | |
2142 | hints.ai_socktype = SOCK_STREAM; | |
2143 | snprintf(strport, sizeof strport, "%d", 6000 + display_number); | |
2144 | if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) { | |
2145 | error("%.100s: unknown host. (%s)", buf, gai_strerror(gaierr)); | |
0b242b12 | 2146 | return -1; |
8efc0c15 | 2147 | } |
48e671d5 | 2148 | for (ai = aitop; ai; ai = ai->ai_next) { |
2149 | /* Create a socket. */ | |
2150 | sock = socket(ai->ai_family, SOCK_STREAM, 0); | |
2151 | if (sock < 0) { | |
2152 | debug("socket: %.100s", strerror(errno)); | |
7368a6c8 | 2153 | continue; |
2154 | } | |
2155 | /* Connect it to the display. */ | |
2156 | if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) { | |
2157 | debug("connect %.100s port %d: %.100s", buf, | |
2158 | 6000 + display_number, strerror(errno)); | |
2159 | close(sock); | |
2160 | continue; | |
2161 | } | |
2162 | /* Success */ | |
2163 | break; | |
48e671d5 | 2164 | } |
48e671d5 | 2165 | freeaddrinfo(aitop); |
2166 | if (!ai) { | |
6ae2364d | 2167 | error("connect %.100s port %d: %.100s", buf, 6000 + display_number, |
48e671d5 | 2168 | strerror(errno)); |
0b242b12 | 2169 | return -1; |
8efc0c15 | 2170 | } |
0b242b12 | 2171 | return sock; |
2172 | } | |
5260325f | 2173 | |
0b242b12 | 2174 | /* |
2175 | * This is called when SSH_SMSG_X11_OPEN is received. The packet contains | |
2176 | * the remote channel number. We should do whatever we want, and respond | |
2177 | * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE. | |
2178 | */ | |
5260325f | 2179 | |
0b242b12 | 2180 | void |
188adeb2 | 2181 | x11_input_open(int type, int plen, void *ctxt) |
0b242b12 | 2182 | { |
2183 | int remote_channel, sock = 0, newch; | |
2184 | char *remote_host; | |
1e3b8b07 | 2185 | u_int remote_len; |
5260325f | 2186 | |
0b242b12 | 2187 | /* Get remote channel number. */ |
2188 | remote_channel = packet_get_int(); | |
5260325f | 2189 | |
0b242b12 | 2190 | /* Get remote originator name. */ |
2191 | if (have_hostname_in_open) { | |
2192 | remote_host = packet_get_string(&remote_len); | |
2193 | remote_len += 4; | |
2194 | } else { | |
2195 | remote_host = xstrdup("unknown (remote did not supply name)"); | |
2196 | remote_len = 0; | |
2197 | } | |
2198 | ||
2199 | debug("Received X11 open request."); | |
2200 | packet_integrity_check(plen, 4 + remote_len, SSH_SMSG_X11_OPEN); | |
2201 | ||
2202 | /* Obtain a connection to the real X display. */ | |
2203 | sock = x11_connect_display(); | |
2204 | if (sock == -1) { | |
2205 | /* Send refusal to the remote host. */ | |
2206 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
2207 | packet_put_int(remote_channel); | |
2208 | packet_send(); | |
2209 | } else { | |
2210 | /* Allocate a channel for this connection. */ | |
2211 | newch = channel_allocate( | |
2212 | (x11_saved_proto == NULL) ? | |
2213 | SSH_CHANNEL_OPEN : SSH_CHANNEL_X11_OPEN, | |
2214 | sock, remote_host); | |
2215 | channels[newch].remote_id = remote_channel; | |
2216 | ||
2217 | /* Send a confirmation to the remote host. */ | |
2218 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
2219 | packet_put_int(remote_channel); | |
2220 | packet_put_int(newch); | |
2221 | packet_send(); | |
2222 | } | |
8efc0c15 | 2223 | } |
2224 | ||
a22aff1f | 2225 | /* dummy protocol handler that denies SSH-1 requests (agent/x11) */ |
2226 | void | |
2227 | deny_input_open(int type, int plen, void *ctxt) | |
2228 | { | |
2229 | int rchan = packet_get_int(); | |
2230 | switch(type){ | |
2231 | case SSH_SMSG_AGENT_OPEN: | |
2232 | error("Warning: ssh server tried agent forwarding."); | |
2233 | break; | |
2234 | case SSH_SMSG_X11_OPEN: | |
2235 | error("Warning: ssh server tried X11 forwarding."); | |
2236 | break; | |
2237 | default: | |
2238 | error("deny_input_open: type %d plen %d", type, plen); | |
2239 | break; | |
2240 | } | |
2241 | error("Warning: this is probably a break in attempt by a malicious server."); | |
2242 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
2243 | packet_put_int(rchan); | |
2244 | packet_send(); | |
2245 | } | |
2246 | ||
aa3378df | 2247 | /* |
2248 | * Requests forwarding of X11 connections, generates fake authentication | |
2249 | * data, and enables authentication spoofing. | |
2250 | */ | |
8efc0c15 | 2251 | |
6ae2364d | 2252 | void |
0b242b12 | 2253 | x11_request_forwarding_with_spoofing(int client_session_id, |
2254 | const char *proto, const char *data) | |
8efc0c15 | 2255 | { |
1e3b8b07 | 2256 | u_int data_len = (u_int) strlen(data) / 2; |
ca910e13 | 2257 | u_int i, value, len; |
5260325f | 2258 | char *new_data; |
2259 | int screen_number; | |
2260 | const char *cp; | |
2261 | u_int32_t rand = 0; | |
2262 | ||
2263 | cp = getenv("DISPLAY"); | |
2264 | if (cp) | |
2265 | cp = strchr(cp, ':'); | |
2266 | if (cp) | |
2267 | cp = strchr(cp, '.'); | |
2268 | if (cp) | |
2269 | screen_number = atoi(cp + 1); | |
2270 | else | |
2271 | screen_number = 0; | |
2272 | ||
2273 | /* Save protocol name. */ | |
2274 | x11_saved_proto = xstrdup(proto); | |
2275 | ||
aa3378df | 2276 | /* |
2277 | * Extract real authentication data and generate fake data of the | |
2278 | * same length. | |
2279 | */ | |
5260325f | 2280 | x11_saved_data = xmalloc(data_len); |
2281 | x11_fake_data = xmalloc(data_len); | |
2282 | for (i = 0; i < data_len; i++) { | |
2283 | if (sscanf(data + 2 * i, "%2x", &value) != 1) | |
2284 | fatal("x11_request_forwarding: bad authentication data: %.100s", data); | |
2285 | if (i % 4 == 0) | |
2286 | rand = arc4random(); | |
2287 | x11_saved_data[i] = value; | |
2288 | x11_fake_data[i] = rand & 0xff; | |
2289 | rand >>= 8; | |
2290 | } | |
2291 | x11_saved_data_len = data_len; | |
2292 | x11_fake_data_len = data_len; | |
2293 | ||
2294 | /* Convert the fake data into hex. */ | |
ca910e13 | 2295 | len = 2 * data_len + 1; |
2296 | new_data = xmalloc(len); | |
5260325f | 2297 | for (i = 0; i < data_len; i++) |
ca910e13 | 2298 | snprintf(new_data + 2 * i, len - 2 * i, |
2299 | "%02x", (u_char) x11_fake_data[i]); | |
5260325f | 2300 | |
2301 | /* Send the request packet. */ | |
0b242b12 | 2302 | if (compat20) { |
2303 | channel_request_start(client_session_id, "x11-req", 0); | |
2304 | packet_put_char(0); /* XXX bool single connection */ | |
2305 | } else { | |
2306 | packet_start(SSH_CMSG_X11_REQUEST_FORWARDING); | |
2307 | } | |
2308 | packet_put_cstring(proto); | |
2309 | packet_put_cstring(new_data); | |
5260325f | 2310 | packet_put_int(screen_number); |
2311 | packet_send(); | |
2312 | packet_write_wait(); | |
2313 | xfree(new_data); | |
8efc0c15 | 2314 | } |
2315 | ||
2316 | /* Sends a message to the server to request authentication fd forwarding. */ | |
2317 | ||
6ae2364d | 2318 | void |
5260325f | 2319 | auth_request_forwarding() |
8efc0c15 | 2320 | { |
5260325f | 2321 | packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING); |
2322 | packet_send(); | |
2323 | packet_write_wait(); | |
8efc0c15 | 2324 | } |
2325 | ||
aa3378df | 2326 | /* |
2327 | * Returns the name of the forwarded authentication socket. Returns NULL if | |
2328 | * there is no forwarded authentication socket. The returned value points to | |
2329 | * a static buffer. | |
2330 | */ | |
8efc0c15 | 2331 | |
5260325f | 2332 | char * |
2333 | auth_get_socket_name() | |
8efc0c15 | 2334 | { |
5260325f | 2335 | return channel_forwarded_auth_socket_name; |
8efc0c15 | 2336 | } |
2337 | ||
2338 | /* removes the agent forwarding socket */ | |
2339 | ||
6ae2364d | 2340 | void |
5260325f | 2341 | cleanup_socket(void) |
2342 | { | |
77bb0bca | 2343 | unlink(channel_forwarded_auth_socket_name); |
5260325f | 2344 | rmdir(channel_forwarded_auth_socket_dir); |
8efc0c15 | 2345 | } |
2346 | ||
aa3378df | 2347 | /* |
fa649821 | 2348 | * This is called to process SSH_CMSG_AGENT_REQUEST_FORWARDING on the server. |
aa3378df | 2349 | * This starts forwarding authentication requests. |
2350 | */ | |
8efc0c15 | 2351 | |
fa649821 | 2352 | int |
5260325f | 2353 | auth_input_request_forwarding(struct passwd * pw) |
8efc0c15 | 2354 | { |
5260325f | 2355 | int sock, newch; |
2356 | struct sockaddr_un sunaddr; | |
2357 | ||
2358 | if (auth_get_socket_name() != NULL) | |
2359 | fatal("Protocol error: authentication forwarding requested twice."); | |
2360 | ||
2361 | /* Temporarily drop privileged uid for mkdir/bind. */ | |
2362 | temporarily_use_uid(pw->pw_uid); | |
2363 | ||
2364 | /* Allocate a buffer for the socket name, and format the name. */ | |
2365 | channel_forwarded_auth_socket_name = xmalloc(MAX_SOCKET_NAME); | |
2366 | channel_forwarded_auth_socket_dir = xmalloc(MAX_SOCKET_NAME); | |
2367 | strlcpy(channel_forwarded_auth_socket_dir, "/tmp/ssh-XXXXXXXX", MAX_SOCKET_NAME); | |
2368 | ||
2369 | /* Create private directory for socket */ | |
fa649821 | 2370 | if (mkdtemp(channel_forwarded_auth_socket_dir) == NULL) { |
2371 | packet_send_debug("Agent forwarding disabled: mkdtemp() failed: %.100s", | |
2372 | strerror(errno)); | |
2373 | restore_uid(); | |
2374 | xfree(channel_forwarded_auth_socket_name); | |
2375 | xfree(channel_forwarded_auth_socket_dir); | |
2376 | channel_forwarded_auth_socket_name = NULL; | |
2377 | channel_forwarded_auth_socket_dir = NULL; | |
2378 | return 0; | |
2379 | } | |
5260325f | 2380 | snprintf(channel_forwarded_auth_socket_name, MAX_SOCKET_NAME, "%s/agent.%d", |
2381 | channel_forwarded_auth_socket_dir, (int) getpid()); | |
2382 | ||
2383 | if (atexit(cleanup_socket) < 0) { | |
2384 | int saved = errno; | |
2385 | cleanup_socket(); | |
2386 | packet_disconnect("socket: %.100s", strerror(saved)); | |
2387 | } | |
2388 | /* Create the socket. */ | |
2389 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
2390 | if (sock < 0) | |
2391 | packet_disconnect("socket: %.100s", strerror(errno)); | |
2392 | ||
2393 | /* Bind it to the name. */ | |
2394 | memset(&sunaddr, 0, sizeof(sunaddr)); | |
2395 | sunaddr.sun_family = AF_UNIX; | |
2396 | strncpy(sunaddr.sun_path, channel_forwarded_auth_socket_name, | |
2397 | sizeof(sunaddr.sun_path)); | |
2398 | ||
2399 | if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0) | |
2400 | packet_disconnect("bind: %.100s", strerror(errno)); | |
2401 | ||
2402 | /* Restore the privileged uid. */ | |
2403 | restore_uid(); | |
2404 | ||
2405 | /* Start listening on the socket. */ | |
2406 | if (listen(sock, 5) < 0) | |
2407 | packet_disconnect("listen: %.100s", strerror(errno)); | |
2408 | ||
2409 | /* Allocate a channel for the authentication agent socket. */ | |
fa08c86b | 2410 | newch = channel_new("auth socket", |
2411 | SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1, | |
2412 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, | |
2413 | 0, xstrdup("auth socket"), 1); | |
2414 | ||
a408af76 | 2415 | strlcpy(channels[newch].path, channel_forwarded_auth_socket_name, |
2416 | sizeof(channels[newch].path)); | |
fa649821 | 2417 | return 1; |
8efc0c15 | 2418 | } |
2419 | ||
2420 | /* This is called to process an SSH_SMSG_AGENT_OPEN message. */ | |
2421 | ||
6ae2364d | 2422 | void |
188adeb2 | 2423 | auth_input_open_request(int type, int plen, void *ctxt) |
8efc0c15 | 2424 | { |
5260325f | 2425 | int remch, sock, newch; |
2426 | char *dummyname; | |
2427 | ||
7368a6c8 | 2428 | packet_integrity_check(plen, 4, type); |
2429 | ||
5260325f | 2430 | /* Read the remote channel number from the message. */ |
2431 | remch = packet_get_int(); | |
2432 | ||
aa3378df | 2433 | /* |
2434 | * Get a connection to the local authentication agent (this may again | |
2435 | * get forwarded). | |
2436 | */ | |
5260325f | 2437 | sock = ssh_get_authentication_socket(); |
2438 | ||
aa3378df | 2439 | /* |
2440 | * If we could not connect the agent, send an error message back to | |
2441 | * the server. This should never happen unless the agent dies, | |
2442 | * because authentication forwarding is only enabled if we have an | |
2443 | * agent. | |
2444 | */ | |
5260325f | 2445 | if (sock < 0) { |
2446 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
2447 | packet_put_int(remch); | |
2448 | packet_send(); | |
2449 | return; | |
2450 | } | |
2451 | debug("Forwarding authentication connection."); | |
2452 | ||
aa3378df | 2453 | /* |
2454 | * Dummy host name. This will be freed when the channel is freed; it | |
2455 | * will still be valid in the packet_put_string below since the | |
2456 | * channel cannot yet be freed at that point. | |
2457 | */ | |
5260325f | 2458 | dummyname = xstrdup("authentication agent connection"); |
2459 | ||
2460 | newch = channel_allocate(SSH_CHANNEL_OPEN, sock, dummyname); | |
2461 | channels[newch].remote_id = remch; | |
2462 | ||
2463 | /* Send a confirmation to the remote host. */ | |
2464 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
2465 | packet_put_int(remch); | |
2466 | packet_put_int(newch); | |
2467 | packet_send(); | |
8efc0c15 | 2468 | } |
7e7327a1 | 2469 | |
2470 | void | |
0b242b12 | 2471 | channel_start_open(int id) |
7e7327a1 | 2472 | { |
2473 | Channel *c = channel_lookup(id); | |
2474 | if (c == NULL) { | |
2475 | log("channel_open: %d: bad id", id); | |
2476 | return; | |
2477 | } | |
0b242b12 | 2478 | debug("send channel open %d", id); |
7e7327a1 | 2479 | packet_start(SSH2_MSG_CHANNEL_OPEN); |
2480 | packet_put_cstring(c->ctype); | |
2481 | packet_put_int(c->self); | |
2482 | packet_put_int(c->local_window); | |
2483 | packet_put_int(c->local_maxpacket); | |
0b242b12 | 2484 | } |
2485 | void | |
2486 | channel_open(int id) | |
2487 | { | |
2488 | /* XXX REMOVE ME */ | |
2489 | channel_start_open(id); | |
7e7327a1 | 2490 | packet_send(); |
7e7327a1 | 2491 | } |
2492 | void | |
2493 | channel_request(int id, char *service, int wantconfirm) | |
2494 | { | |
2495 | channel_request_start(id, service, wantconfirm); | |
2496 | packet_send(); | |
2497 | debug("channel request %d: %s", id, service) ; | |
2498 | } | |
2499 | void | |
2500 | channel_request_start(int id, char *service, int wantconfirm) | |
2501 | { | |
2502 | Channel *c = channel_lookup(id); | |
2503 | if (c == NULL) { | |
2504 | log("channel_request: %d: bad id", id); | |
2505 | return; | |
2506 | } | |
2507 | packet_start(SSH2_MSG_CHANNEL_REQUEST); | |
2508 | packet_put_int(c->remote_id); | |
2509 | packet_put_cstring(service); | |
2510 | packet_put_char(wantconfirm); | |
2511 | } | |
2512 | void | |
2513 | channel_register_callback(int id, int mtype, channel_callback_fn *fn, void *arg) | |
2514 | { | |
2515 | Channel *c = channel_lookup(id); | |
2516 | if (c == NULL) { | |
2517 | log("channel_register_callback: %d: bad id", id); | |
2518 | return; | |
2519 | } | |
2520 | c->cb_event = mtype; | |
2521 | c->cb_fn = fn; | |
2522 | c->cb_arg = arg; | |
2523 | } | |
2524 | void | |
2525 | channel_register_cleanup(int id, channel_callback_fn *fn) | |
2526 | { | |
2527 | Channel *c = channel_lookup(id); | |
2528 | if (c == NULL) { | |
2529 | log("channel_register_cleanup: %d: bad id", id); | |
2530 | return; | |
2531 | } | |
2532 | c->dettach_user = fn; | |
2533 | } | |
2534 | void | |
2535 | channel_cancel_cleanup(int id) | |
2536 | { | |
2537 | Channel *c = channel_lookup(id); | |
2538 | if (c == NULL) { | |
2539 | log("channel_cancel_cleanup: %d: bad id", id); | |
2540 | return; | |
2541 | } | |
2542 | c->dettach_user = NULL; | |
2543 | } | |
2b87da3b | 2544 | void |
2e73a022 | 2545 | channel_register_filter(int id, channel_filter_fn *fn) |
2546 | { | |
2547 | Channel *c = channel_lookup(id); | |
2548 | if (c == NULL) { | |
2549 | log("channel_register_filter: %d: bad id", id); | |
2550 | return; | |
2551 | } | |
2552 | c->input_filter = fn; | |
2553 | } | |
7e7327a1 | 2554 | |
2555 | void | |
a22aff1f | 2556 | channel_set_fds(int id, int rfd, int wfd, int efd, |
2557 | int extusage, int nonblock) | |
7e7327a1 | 2558 | { |
2559 | Channel *c = channel_lookup(id); | |
2560 | if (c == NULL || c->type != SSH_CHANNEL_LARVAL) | |
2561 | fatal("channel_activate for non-larval channel %d.", id); | |
a22aff1f | 2562 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock); |
7e7327a1 | 2563 | c->type = SSH_CHANNEL_OPEN; |
7e7327a1 | 2564 | /* XXX window size? */ |
bcbf86ec | 2565 | c->local_window = c->local_window_max = c->local_maxpacket * 2; |
7e7327a1 | 2566 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
2567 | packet_put_int(c->remote_id); | |
2568 | packet_put_int(c->local_window); | |
2569 | packet_send(); | |
2570 | } |