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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" | |
97fb6912 | 43 | RCSID("$OpenBSD: channels.c,v 1.75 2000/12/05 20:34:09 markus Exp $"); |
8efc0c15 | 44 | |
45 | #include "ssh.h" | |
46 | #include "packet.h" | |
47 | #include "xmalloc.h" | |
48 | #include "buffer.h" | |
8efc0c15 | 49 | #include "uidswap.h" |
6fa724bc | 50 | #include "readconf.h" |
8efc0c15 | 51 | #include "servconf.h" |
52 | ||
53 | #include "channels.h" | |
54 | #include "nchan.h" | |
55 | #include "compat.h" | |
56 | ||
7e7327a1 | 57 | #include "ssh2.h" |
4c8722d9 | 58 | |
59 | #include <openssl/rsa.h> | |
60 | #include <openssl/dsa.h> | |
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 | */ | |
8efc0c15 | 87 | static int channel_max_fd_value = 0; |
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; | |
98 | unsigned int x11_saved_data_len = 0; | |
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; |
105 | unsigned int x11_fake_data_len; | |
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 | ||
133 | /* Sets specific protocol options. */ | |
134 | ||
6ae2364d | 135 | void |
5260325f | 136 | channel_set_options(int hostname_in_open) |
8efc0c15 | 137 | { |
5260325f | 138 | have_hostname_in_open = hostname_in_open; |
8efc0c15 | 139 | } |
140 | ||
aa3378df | 141 | /* |
142 | * Permits opening to any host/port in SSH_MSG_PORT_OPEN. This is usually | |
143 | * called by the server, because the user could connect to any port anyway, | |
144 | * and the server has no way to know but to trust the client anyway. | |
145 | */ | |
8efc0c15 | 146 | |
6ae2364d | 147 | void |
5260325f | 148 | channel_permit_all_opens() |
8efc0c15 | 149 | { |
5260325f | 150 | all_opens_permitted = 1; |
8efc0c15 | 151 | } |
152 | ||
7368a6c8 | 153 | /* lookup channel by id */ |
154 | ||
155 | Channel * | |
156 | channel_lookup(int id) | |
157 | { | |
158 | Channel *c; | |
3e98362e | 159 | if (id < 0 || id > channels_alloc) { |
7368a6c8 | 160 | log("channel_lookup: %d: bad id", id); |
161 | return NULL; | |
162 | } | |
163 | c = &channels[id]; | |
164 | if (c->type == SSH_CHANNEL_FREE) { | |
165 | log("channel_lookup: %d: bad id: channel free", id); | |
166 | return NULL; | |
167 | } | |
168 | return c; | |
169 | } | |
170 | ||
aa3378df | 171 | /* |
1d1ffb87 | 172 | * Register filedescriptors for a channel, used when allocating a channel or |
0fbe8c74 | 173 | * when the channel consumer/producer is ready, e.g. shell exec'd |
aa3378df | 174 | */ |
8efc0c15 | 175 | |
0fbe8c74 | 176 | void |
a22aff1f | 177 | channel_register_fds(Channel *c, int rfd, int wfd, int efd, |
178 | int extusage, int nonblock) | |
8efc0c15 | 179 | { |
5260325f | 180 | /* Update the maximum file descriptor value. */ |
7368a6c8 | 181 | if (rfd > channel_max_fd_value) |
182 | channel_max_fd_value = rfd; | |
183 | if (wfd > channel_max_fd_value) | |
184 | channel_max_fd_value = wfd; | |
185 | if (efd > channel_max_fd_value) | |
186 | channel_max_fd_value = efd; | |
aa3378df | 187 | /* XXX set close-on-exec -markus */ |
1d1ffb87 | 188 | |
0fbe8c74 | 189 | c->rfd = rfd; |
190 | c->wfd = wfd; | |
191 | c->sock = (rfd == wfd) ? rfd : -1; | |
192 | c->efd = efd; | |
193 | c->extended_usage = extusage; | |
a22aff1f | 194 | |
195 | /* enable nonblocking mode */ | |
196 | if (nonblock) { | |
197 | if (rfd != -1) | |
198 | set_nonblock(rfd); | |
199 | if (wfd != -1) | |
200 | set_nonblock(wfd); | |
201 | if (efd != -1) | |
202 | set_nonblock(efd); | |
203 | } | |
0fbe8c74 | 204 | } |
205 | ||
206 | /* | |
207 | * Allocate a new channel object and set its type and socket. This will cause | |
208 | * remote_name to be freed. | |
209 | */ | |
210 | ||
211 | int | |
212 | channel_new(char *ctype, int type, int rfd, int wfd, int efd, | |
a22aff1f | 213 | int window, int maxpack, int extusage, char *remote_name, int nonblock) |
0fbe8c74 | 214 | { |
215 | int i, found; | |
216 | Channel *c; | |
5260325f | 217 | |
218 | /* Do initial allocation if this is the first call. */ | |
219 | if (channels_alloc == 0) { | |
7e7327a1 | 220 | chan_init(); |
5260325f | 221 | channels_alloc = 10; |
222 | channels = xmalloc(channels_alloc * sizeof(Channel)); | |
223 | for (i = 0; i < channels_alloc; i++) | |
224 | channels[i].type = SSH_CHANNEL_FREE; | |
aa3378df | 225 | /* |
226 | * Kludge: arrange a call to channel_stop_listening if we | |
227 | * terminate with fatal(). | |
228 | */ | |
5260325f | 229 | fatal_add_cleanup((void (*) (void *)) channel_stop_listening, NULL); |
230 | } | |
231 | /* Try to find a free slot where to put the new channel. */ | |
232 | for (found = -1, i = 0; i < channels_alloc; i++) | |
233 | if (channels[i].type == SSH_CHANNEL_FREE) { | |
234 | /* Found a free slot. */ | |
235 | found = i; | |
236 | break; | |
237 | } | |
238 | if (found == -1) { | |
aa3378df | 239 | /* There are no free slots. Take last+1 slot and expand the array. */ |
5260325f | 240 | found = channels_alloc; |
241 | channels_alloc += 10; | |
de273eef | 242 | debug2("channel: expanding %d", channels_alloc); |
5260325f | 243 | channels = xrealloc(channels, channels_alloc * sizeof(Channel)); |
244 | for (i = found; i < channels_alloc; i++) | |
245 | channels[i].type = SSH_CHANNEL_FREE; | |
246 | } | |
247 | /* Initialize and return new channel number. */ | |
248 | c = &channels[found]; | |
249 | buffer_init(&c->input); | |
250 | buffer_init(&c->output); | |
7368a6c8 | 251 | buffer_init(&c->extended); |
5260325f | 252 | chan_init_iostates(c); |
a22aff1f | 253 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock); |
5260325f | 254 | c->self = found; |
255 | c->type = type; | |
7368a6c8 | 256 | c->ctype = ctype; |
0b242b12 | 257 | c->local_window = window; |
258 | c->local_window_max = window; | |
259 | c->local_consumed = 0; | |
260 | c->local_maxpacket = maxpack; | |
5260325f | 261 | c->remote_id = -1; |
262 | c->remote_name = remote_name; | |
7368a6c8 | 263 | c->remote_window = 0; |
264 | c->remote_maxpacket = 0; | |
265 | c->cb_fn = NULL; | |
266 | c->cb_arg = NULL; | |
267 | c->cb_event = 0; | |
268 | c->dettach_user = NULL; | |
2e73a022 | 269 | c->input_filter = NULL; |
5260325f | 270 | debug("channel %d: new [%s]", found, remote_name); |
271 | return found; | |
8efc0c15 | 272 | } |
0fbe8c74 | 273 | /* old interface XXX */ |
6ae2364d | 274 | int |
7368a6c8 | 275 | channel_allocate(int type, int sock, char *remote_name) |
276 | { | |
a22aff1f | 277 | return channel_new("", type, sock, sock, -1, 0, 0, 0, remote_name, 1); |
7368a6c8 | 278 | } |
8efc0c15 | 279 | |
0fbe8c74 | 280 | |
281 | /* Close all channel fd/socket. */ | |
282 | ||
283 | void | |
284 | channel_close_fds(Channel *c) | |
285 | { | |
286 | if (c->sock != -1) { | |
287 | close(c->sock); | |
288 | c->sock = -1; | |
289 | } | |
290 | if (c->rfd != -1) { | |
291 | close(c->rfd); | |
292 | c->rfd = -1; | |
293 | } | |
294 | if (c->wfd != -1) { | |
295 | close(c->wfd); | |
296 | c->wfd = -1; | |
297 | } | |
298 | if (c->efd != -1) { | |
299 | close(c->efd); | |
300 | c->efd = -1; | |
301 | } | |
302 | } | |
303 | ||
304 | /* Free the channel and close its fd/socket. */ | |
8efc0c15 | 305 | |
6ae2364d | 306 | void |
7368a6c8 | 307 | channel_free(int id) |
8efc0c15 | 308 | { |
7368a6c8 | 309 | Channel *c = channel_lookup(id); |
310 | if (c == NULL) | |
311 | packet_disconnect("channel free: bad local channel %d", id); | |
312 | debug("channel_free: channel %d: status: %s", id, channel_open_message()); | |
7e7327a1 | 313 | if (c->dettach_user != NULL) { |
314 | debug("channel_free: channel %d: dettaching channel user", id); | |
315 | c->dettach_user(c->self, NULL); | |
316 | } | |
0fbe8c74 | 317 | if (c->sock != -1) |
7368a6c8 | 318 | shutdown(c->sock, SHUT_RDWR); |
0fbe8c74 | 319 | channel_close_fds(c); |
7368a6c8 | 320 | buffer_free(&c->input); |
321 | buffer_free(&c->output); | |
322 | buffer_free(&c->extended); | |
323 | c->type = SSH_CHANNEL_FREE; | |
324 | if (c->remote_name) { | |
325 | xfree(c->remote_name); | |
326 | c->remote_name = NULL; | |
5260325f | 327 | } |
8efc0c15 | 328 | } |
329 | ||
aa3378df | 330 | /* |
7368a6c8 | 331 | * 'channel_pre*' are called just before select() to add any bits relevant to |
332 | * channels in the select bitmasks. | |
aa3378df | 333 | */ |
7368a6c8 | 334 | /* |
335 | * 'channel_post*': perform any appropriate operations for channels which | |
336 | * have events pending. | |
337 | */ | |
338 | typedef void chan_fn(Channel *c, fd_set * readset, fd_set * writeset); | |
339 | chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE]; | |
340 | chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE]; | |
8efc0c15 | 341 | |
7368a6c8 | 342 | void |
343 | channel_pre_listener(Channel *c, fd_set * readset, fd_set * writeset) | |
8efc0c15 | 344 | { |
7368a6c8 | 345 | FD_SET(c->sock, readset); |
346 | } | |
5260325f | 347 | |
97fb6912 | 348 | void |
349 | channel_pre_connecting(Channel *c, fd_set * readset, fd_set * writeset) | |
350 | { | |
351 | debug3("channel %d: waiting for connection", c->self); | |
352 | FD_SET(c->sock, writeset); | |
353 | } | |
354 | ||
7368a6c8 | 355 | void |
356 | channel_pre_open_13(Channel *c, fd_set * readset, fd_set * writeset) | |
357 | { | |
358 | if (buffer_len(&c->input) < packet_get_maxsize()) | |
359 | FD_SET(c->sock, readset); | |
360 | if (buffer_len(&c->output) > 0) | |
361 | FD_SET(c->sock, writeset); | |
362 | } | |
5260325f | 363 | |
7368a6c8 | 364 | void |
365 | channel_pre_open_15(Channel *c, fd_set * readset, fd_set * writeset) | |
366 | { | |
367 | /* test whether sockets are 'alive' for read/write */ | |
368 | if (c->istate == CHAN_INPUT_OPEN) | |
369 | if (buffer_len(&c->input) < packet_get_maxsize()) | |
370 | FD_SET(c->sock, readset); | |
371 | if (c->ostate == CHAN_OUTPUT_OPEN || | |
372 | c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { | |
373 | if (buffer_len(&c->output) > 0) { | |
374 | FD_SET(c->sock, writeset); | |
375 | } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { | |
376 | chan_obuf_empty(c); | |
377 | } | |
378 | } | |
379 | } | |
5260325f | 380 | |
7e7327a1 | 381 | void |
382 | channel_pre_open_20(Channel *c, fd_set * readset, fd_set * writeset) | |
383 | { | |
384 | if (c->istate == CHAN_INPUT_OPEN && | |
385 | c->remote_window > 0 && | |
386 | buffer_len(&c->input) < c->remote_window) | |
387 | FD_SET(c->rfd, 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->wfd, writeset); | |
392 | } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { | |
393 | chan_obuf_empty(c); | |
394 | } | |
395 | } | |
396 | /** XXX check close conditions, too */ | |
397 | if (c->efd != -1) { | |
398 | if (c->extended_usage == CHAN_EXTENDED_WRITE && | |
399 | buffer_len(&c->extended) > 0) | |
400 | FD_SET(c->efd, writeset); | |
401 | else if (c->extended_usage == CHAN_EXTENDED_READ && | |
402 | buffer_len(&c->extended) < c->remote_window) | |
403 | FD_SET(c->efd, readset); | |
404 | } | |
405 | } | |
406 | ||
7368a6c8 | 407 | void |
408 | channel_pre_input_draining(Channel *c, fd_set * readset, fd_set * writeset) | |
409 | { | |
410 | if (buffer_len(&c->input) == 0) { | |
411 | packet_start(SSH_MSG_CHANNEL_CLOSE); | |
412 | packet_put_int(c->remote_id); | |
413 | packet_send(); | |
414 | c->type = SSH_CHANNEL_CLOSED; | |
415 | debug("Closing channel %d after input drain.", c->self); | |
416 | } | |
417 | } | |
5260325f | 418 | |
7368a6c8 | 419 | void |
420 | channel_pre_output_draining(Channel *c, fd_set * readset, fd_set * writeset) | |
421 | { | |
422 | if (buffer_len(&c->output) == 0) | |
423 | channel_free(c->self); | |
6ae2364d | 424 | else |
7368a6c8 | 425 | FD_SET(c->sock, writeset); |
426 | } | |
5260325f | 427 | |
7368a6c8 | 428 | /* |
429 | * This is a special state for X11 authentication spoofing. An opened X11 | |
430 | * connection (when authentication spoofing is being done) remains in this | |
431 | * state until the first packet has been completely read. The authentication | |
432 | * data in that packet is then substituted by the real data if it matches the | |
433 | * fake data, and the channel is put into normal mode. | |
0b242b12 | 434 | * XXX All this happens at the client side. |
7368a6c8 | 435 | */ |
436 | int | |
437 | x11_open_helper(Channel *c) | |
438 | { | |
439 | unsigned char *ucp; | |
440 | unsigned int proto_len, data_len; | |
5260325f | 441 | |
7368a6c8 | 442 | /* Check if the fixed size part of the packet is in buffer. */ |
443 | if (buffer_len(&c->output) < 12) | |
444 | return 0; | |
445 | ||
446 | /* Parse the lengths of variable-length fields. */ | |
447 | ucp = (unsigned char *) buffer_ptr(&c->output); | |
448 | if (ucp[0] == 0x42) { /* Byte order MSB first. */ | |
449 | proto_len = 256 * ucp[6] + ucp[7]; | |
450 | data_len = 256 * ucp[8] + ucp[9]; | |
451 | } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */ | |
452 | proto_len = ucp[6] + 256 * ucp[7]; | |
453 | data_len = ucp[8] + 256 * ucp[9]; | |
454 | } else { | |
455 | debug("Initial X11 packet contains bad byte order byte: 0x%x", | |
456 | ucp[0]); | |
457 | return -1; | |
458 | } | |
5260325f | 459 | |
7368a6c8 | 460 | /* Check if the whole packet is in buffer. */ |
461 | if (buffer_len(&c->output) < | |
462 | 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3)) | |
463 | return 0; | |
5260325f | 464 | |
7368a6c8 | 465 | /* Check if authentication protocol matches. */ |
466 | if (proto_len != strlen(x11_saved_proto) || | |
467 | memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) { | |
468 | debug("X11 connection uses different authentication protocol."); | |
469 | return -1; | |
470 | } | |
471 | /* Check if authentication data matches our fake data. */ | |
472 | if (data_len != x11_fake_data_len || | |
473 | memcmp(ucp + 12 + ((proto_len + 3) & ~3), | |
474 | x11_fake_data, x11_fake_data_len) != 0) { | |
475 | debug("X11 auth data does not match fake data."); | |
476 | return -1; | |
477 | } | |
478 | /* Check fake data length */ | |
479 | if (x11_fake_data_len != x11_saved_data_len) { | |
480 | error("X11 fake_data_len %d != saved_data_len %d", | |
481 | x11_fake_data_len, x11_saved_data_len); | |
482 | return -1; | |
483 | } | |
484 | /* | |
485 | * Received authentication protocol and data match | |
486 | * our fake data. Substitute the fake data with real | |
487 | * data. | |
488 | */ | |
489 | memcpy(ucp + 12 + ((proto_len + 3) & ~3), | |
490 | x11_saved_data, x11_saved_data_len); | |
491 | return 1; | |
492 | } | |
5260325f | 493 | |
7368a6c8 | 494 | void |
495 | channel_pre_x11_open_13(Channel *c, fd_set * readset, fd_set * writeset) | |
496 | { | |
497 | int ret = x11_open_helper(c); | |
498 | if (ret == 1) { | |
499 | /* Start normal processing for the channel. */ | |
500 | c->type = SSH_CHANNEL_OPEN; | |
a8be9f80 | 501 | channel_pre_open_13(c, readset, writeset); |
7368a6c8 | 502 | } else if (ret == -1) { |
503 | /* | |
504 | * We have received an X11 connection that has bad | |
505 | * authentication information. | |
506 | */ | |
507 | log("X11 connection rejected because of wrong authentication.\r\n"); | |
508 | buffer_clear(&c->input); | |
509 | buffer_clear(&c->output); | |
510 | close(c->sock); | |
511 | c->sock = -1; | |
512 | c->type = SSH_CHANNEL_CLOSED; | |
513 | packet_start(SSH_MSG_CHANNEL_CLOSE); | |
514 | packet_put_int(c->remote_id); | |
515 | packet_send(); | |
516 | } | |
517 | } | |
5260325f | 518 | |
7368a6c8 | 519 | void |
0b242b12 | 520 | channel_pre_x11_open(Channel *c, fd_set * readset, fd_set * writeset) |
7368a6c8 | 521 | { |
522 | int ret = x11_open_helper(c); | |
523 | if (ret == 1) { | |
524 | c->type = SSH_CHANNEL_OPEN; | |
d0c832f3 | 525 | if (compat20) |
526 | channel_pre_open_20(c, readset, writeset); | |
527 | else | |
528 | channel_pre_open_15(c, readset, writeset); | |
7368a6c8 | 529 | } else if (ret == -1) { |
530 | debug("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate); | |
0b242b12 | 531 | chan_read_failed(c); /** force close? */ |
7368a6c8 | 532 | chan_write_failed(c); |
533 | debug("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate); | |
534 | } | |
535 | } | |
5260325f | 536 | |
7368a6c8 | 537 | /* This is our fake X11 server socket. */ |
538 | void | |
539 | channel_post_x11_listener(Channel *c, fd_set * readset, fd_set * writeset) | |
540 | { | |
541 | struct sockaddr addr; | |
542 | int newsock, newch; | |
543 | socklen_t addrlen; | |
544 | char buf[16384], *remote_hostname; | |
0b242b12 | 545 | int remote_port; |
7368a6c8 | 546 | |
547 | if (FD_ISSET(c->sock, readset)) { | |
548 | debug("X11 connection requested."); | |
549 | addrlen = sizeof(addr); | |
550 | newsock = accept(c->sock, &addr, &addrlen); | |
551 | if (newsock < 0) { | |
552 | error("accept: %.100s", strerror(errno)); | |
553 | return; | |
5260325f | 554 | } |
7368a6c8 | 555 | remote_hostname = get_remote_hostname(newsock); |
0b242b12 | 556 | remote_port = get_peer_port(newsock); |
7368a6c8 | 557 | snprintf(buf, sizeof buf, "X11 connection from %.200s port %d", |
0b242b12 | 558 | remote_hostname, remote_port); |
559 | ||
560 | newch = channel_new("x11", | |
561 | SSH_CHANNEL_OPENING, newsock, newsock, -1, | |
562 | c->local_window_max, c->local_maxpacket, | |
a22aff1f | 563 | 0, xstrdup(buf), 1); |
0b242b12 | 564 | if (compat20) { |
565 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
566 | packet_put_cstring("x11"); | |
567 | packet_put_int(newch); | |
568 | packet_put_int(c->local_window_max); | |
569 | packet_put_int(c->local_maxpacket); | |
570 | /* originator host and port */ | |
571 | packet_put_cstring(remote_hostname); | |
d0c832f3 | 572 | if (datafellows & SSH_BUG_X11FWD) { |
573 | debug("ssh2 x11 bug compat mode"); | |
574 | } else { | |
575 | packet_put_int(remote_port); | |
576 | } | |
0b242b12 | 577 | packet_send(); |
578 | } else { | |
579 | packet_start(SSH_SMSG_X11_OPEN); | |
580 | packet_put_int(newch); | |
581 | if (have_hostname_in_open) | |
582 | packet_put_string(buf, strlen(buf)); | |
583 | packet_send(); | |
584 | } | |
7368a6c8 | 585 | xfree(remote_hostname); |
8efc0c15 | 586 | } |
8efc0c15 | 587 | } |
588 | ||
aa3378df | 589 | /* |
7368a6c8 | 590 | * This socket is listening for connections to a forwarded TCP/IP port. |
aa3378df | 591 | */ |
7368a6c8 | 592 | void |
593 | channel_post_port_listener(Channel *c, fd_set * readset, fd_set * writeset) | |
594 | { | |
595 | struct sockaddr addr; | |
596 | int newsock, newch; | |
597 | socklen_t addrlen; | |
fa08c86b | 598 | char buf[1024], *remote_hostname, *rtype; |
7368a6c8 | 599 | int remote_port; |
600 | ||
fa08c86b | 601 | rtype = (c->type == SSH_CHANNEL_RPORT_LISTENER) ? |
602 | "forwarded-tcpip" : "direct-tcpip"; | |
603 | ||
7368a6c8 | 604 | if (FD_ISSET(c->sock, readset)) { |
605 | debug("Connection to port %d forwarding " | |
606 | "to %.100s port %d requested.", | |
607 | c->listening_port, c->path, c->host_port); | |
608 | addrlen = sizeof(addr); | |
609 | newsock = accept(c->sock, &addr, &addrlen); | |
610 | if (newsock < 0) { | |
611 | error("accept: %.100s", strerror(errno)); | |
612 | return; | |
613 | } | |
614 | remote_hostname = get_remote_hostname(newsock); | |
615 | remote_port = get_peer_port(newsock); | |
616 | snprintf(buf, sizeof buf, | |
617 | "listen port %d for %.100s port %d, " | |
618 | "connect from %.200s port %d", | |
619 | c->listening_port, c->path, c->host_port, | |
620 | remote_hostname, remote_port); | |
fa08c86b | 621 | |
622 | newch = channel_new(rtype, | |
7368a6c8 | 623 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
624 | c->local_window_max, c->local_maxpacket, | |
a22aff1f | 625 | 0, xstrdup(buf), 1); |
7e7327a1 | 626 | if (compat20) { |
627 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
fa08c86b | 628 | packet_put_cstring(rtype); |
7e7327a1 | 629 | packet_put_int(newch); |
630 | packet_put_int(c->local_window_max); | |
631 | packet_put_int(c->local_maxpacket); | |
fa08c86b | 632 | if (c->type == SSH_CHANNEL_RPORT_LISTENER) { |
633 | /* listen address, port */ | |
634 | packet_put_string(c->path, strlen(c->path)); | |
635 | packet_put_int(c->listening_port); | |
636 | } else { | |
637 | /* target host, port */ | |
638 | packet_put_string(c->path, strlen(c->path)); | |
639 | packet_put_int(c->host_port); | |
640 | } | |
6ae2364d | 641 | /* originator host and port */ |
7e7327a1 | 642 | packet_put_cstring(remote_hostname); |
643 | packet_put_int(remote_port); | |
644 | packet_send(); | |
645 | } else { | |
646 | packet_start(SSH_MSG_PORT_OPEN); | |
647 | packet_put_int(newch); | |
648 | packet_put_string(c->path, strlen(c->path)); | |
649 | packet_put_int(c->host_port); | |
650 | if (have_hostname_in_open) { | |
651 | packet_put_string(buf, strlen(buf)); | |
652 | } | |
653 | packet_send(); | |
7368a6c8 | 654 | } |
7368a6c8 | 655 | xfree(remote_hostname); |
656 | } | |
657 | } | |
8efc0c15 | 658 | |
7368a6c8 | 659 | /* |
660 | * This is the authentication agent socket listening for connections from | |
661 | * clients. | |
662 | */ | |
663 | void | |
664 | channel_post_auth_listener(Channel *c, fd_set * readset, fd_set * writeset) | |
8efc0c15 | 665 | { |
5260325f | 666 | struct sockaddr addr; |
7368a6c8 | 667 | int newsock, newch; |
48e671d5 | 668 | socklen_t addrlen; |
5260325f | 669 | |
7368a6c8 | 670 | if (FD_ISSET(c->sock, readset)) { |
671 | addrlen = sizeof(addr); | |
672 | newsock = accept(c->sock, &addr, &addrlen); | |
673 | if (newsock < 0) { | |
674 | error("accept from auth socket: %.100s", strerror(errno)); | |
675 | return; | |
676 | } | |
fa08c86b | 677 | newch = channel_new("accepted auth socket", |
678 | SSH_CHANNEL_OPENING, newsock, newsock, -1, | |
679 | c->local_window_max, c->local_maxpacket, | |
680 | 0, xstrdup("accepted auth socket"), 1); | |
681 | if (compat20) { | |
682 | packet_start(SSH2_MSG_CHANNEL_OPEN); | |
683 | packet_put_cstring("auth-agent@openssh.com"); | |
684 | packet_put_int(newch); | |
685 | packet_put_int(c->local_window_max); | |
686 | packet_put_int(c->local_maxpacket); | |
687 | } else { | |
688 | packet_start(SSH_SMSG_AGENT_OPEN); | |
689 | packet_put_int(newch); | |
690 | } | |
7368a6c8 | 691 | packet_send(); |
692 | } | |
693 | } | |
5260325f | 694 | |
97fb6912 | 695 | void |
696 | channel_post_connecting(Channel *c, fd_set * readset, fd_set * writeset) | |
697 | { | |
698 | if (FD_ISSET(c->sock, writeset)) { | |
699 | int err = 0; | |
700 | int sz = sizeof(err); | |
701 | c->type = SSH_CHANNEL_OPEN; | |
702 | if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, (char *)&err, &sz) < 0) { | |
703 | debug("getsockopt SO_ERROR failed"); | |
704 | } else { | |
705 | if (err == 0) { | |
706 | debug("channel %d: connected)", c->self); | |
707 | } else { | |
708 | debug("channel %d: not connected: %s", | |
709 | c->self, strerror(err)); | |
710 | chan_read_failed(c); | |
711 | chan_write_failed(c); | |
712 | } | |
713 | } | |
714 | } | |
715 | } | |
716 | ||
7368a6c8 | 717 | int |
718 | channel_handle_rfd(Channel *c, fd_set * readset, fd_set * writeset) | |
719 | { | |
720 | char buf[16*1024]; | |
721 | int len; | |
722 | ||
723 | if (c->rfd != -1 && | |
724 | FD_ISSET(c->rfd, readset)) { | |
725 | len = read(c->rfd, buf, sizeof(buf)); | |
0fbe8c74 | 726 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
727 | return 1; | |
7368a6c8 | 728 | if (len <= 0) { |
0b242b12 | 729 | debug("channel %d: read<=0 rfd %d len %d", |
7368a6c8 | 730 | c->self, c->rfd, len); |
731 | if (compat13) { | |
732 | buffer_consume(&c->output, buffer_len(&c->output)); | |
733 | c->type = SSH_CHANNEL_INPUT_DRAINING; | |
734 | debug("Channel %d status set to input draining.", c->self); | |
735 | } else { | |
736 | chan_read_failed(c); | |
5260325f | 737 | } |
7368a6c8 | 738 | return -1; |
739 | } | |
2e73a022 | 740 | if(c->input_filter != NULL) { |
741 | if (c->input_filter(c, buf, len) == -1) { | |
742 | debug("filter stops channel %d", c->self); | |
743 | chan_read_failed(c); | |
744 | } | |
745 | } else { | |
746 | buffer_append(&c->input, buf, len); | |
747 | } | |
7368a6c8 | 748 | } |
749 | return 1; | |
750 | } | |
751 | int | |
752 | channel_handle_wfd(Channel *c, fd_set * readset, fd_set * writeset) | |
753 | { | |
754 | int len; | |
755 | ||
756 | /* Send buffered output data to the socket. */ | |
757 | if (c->wfd != -1 && | |
758 | FD_ISSET(c->wfd, writeset) && | |
759 | buffer_len(&c->output) > 0) { | |
760 | len = write(c->wfd, buffer_ptr(&c->output), | |
0fbe8c74 | 761 | buffer_len(&c->output)); |
762 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) | |
763 | return 1; | |
7368a6c8 | 764 | if (len <= 0) { |
765 | if (compat13) { | |
766 | buffer_consume(&c->output, buffer_len(&c->output)); | |
767 | debug("Channel %d status set to input draining.", c->self); | |
768 | c->type = SSH_CHANNEL_INPUT_DRAINING; | |
769 | } else { | |
770 | chan_write_failed(c); | |
5260325f | 771 | } |
7368a6c8 | 772 | return -1; |
773 | } | |
774 | buffer_consume(&c->output, len); | |
7e7327a1 | 775 | if (compat20 && len > 0) { |
776 | c->local_consumed += len; | |
777 | } | |
778 | } | |
779 | return 1; | |
780 | } | |
781 | int | |
782 | channel_handle_efd(Channel *c, fd_set * readset, fd_set * writeset) | |
783 | { | |
784 | char buf[16*1024]; | |
785 | int len; | |
786 | ||
8ce64345 | 787 | /** XXX handle drain efd, too */ |
7e7327a1 | 788 | if (c->efd != -1) { |
789 | if (c->extended_usage == CHAN_EXTENDED_WRITE && | |
790 | FD_ISSET(c->efd, writeset) && | |
791 | buffer_len(&c->extended) > 0) { | |
792 | len = write(c->efd, buffer_ptr(&c->extended), | |
793 | buffer_len(&c->extended)); | |
de273eef | 794 | debug2("channel %d: written %d to efd %d", |
7e7327a1 | 795 | c->self, len, c->efd); |
796 | if (len > 0) { | |
797 | buffer_consume(&c->extended, len); | |
798 | c->local_consumed += len; | |
799 | } | |
800 | } else if (c->extended_usage == CHAN_EXTENDED_READ && | |
801 | FD_ISSET(c->efd, readset)) { | |
802 | len = read(c->efd, buf, sizeof(buf)); | |
de273eef | 803 | debug2("channel %d: read %d from efd %d", |
7e7327a1 | 804 | c->self, len, c->efd); |
8ce64345 | 805 | if (len == 0) { |
806 | debug("channel %d: closing efd %d", | |
807 | c->self, c->efd); | |
808 | close(c->efd); | |
809 | c->efd = -1; | |
810 | } else if (len > 0) | |
7e7327a1 | 811 | buffer_append(&c->extended, buf, len); |
812 | } | |
813 | } | |
814 | return 1; | |
815 | } | |
816 | int | |
817 | channel_check_window(Channel *c, fd_set * readset, fd_set * writeset) | |
818 | { | |
e78a59f5 | 819 | if (!(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) && |
7e7327a1 | 820 | c->local_window < c->local_window_max/2 && |
821 | c->local_consumed > 0) { | |
822 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); | |
823 | packet_put_int(c->remote_id); | |
824 | packet_put_int(c->local_consumed); | |
825 | packet_send(); | |
de273eef | 826 | debug2("channel %d: window %d sent adjust %d", |
7e7327a1 | 827 | c->self, c->local_window, |
828 | c->local_consumed); | |
829 | c->local_window += c->local_consumed; | |
830 | c->local_consumed = 0; | |
7368a6c8 | 831 | } |
832 | return 1; | |
833 | } | |
5260325f | 834 | |
7368a6c8 | 835 | void |
836 | channel_post_open_1(Channel *c, fd_set * readset, fd_set * writeset) | |
837 | { | |
838 | channel_handle_rfd(c, readset, writeset); | |
839 | channel_handle_wfd(c, readset, writeset); | |
840 | } | |
aa3378df | 841 | |
7e7327a1 | 842 | void |
843 | channel_post_open_2(Channel *c, fd_set * readset, fd_set * writeset) | |
844 | { | |
845 | channel_handle_rfd(c, readset, writeset); | |
846 | channel_handle_wfd(c, readset, writeset); | |
847 | channel_handle_efd(c, readset, writeset); | |
848 | channel_check_window(c, readset, writeset); | |
849 | } | |
850 | ||
7368a6c8 | 851 | void |
852 | channel_post_output_drain_13(Channel *c, fd_set * readset, fd_set * writeset) | |
853 | { | |
854 | int len; | |
855 | /* Send buffered output data to the socket. */ | |
856 | if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) { | |
857 | len = write(c->sock, buffer_ptr(&c->output), | |
858 | buffer_len(&c->output)); | |
859 | if (len <= 0) | |
860 | buffer_consume(&c->output, buffer_len(&c->output)); | |
861 | else | |
862 | buffer_consume(&c->output, len); | |
863 | } | |
864 | } | |
5260325f | 865 | |
7e7327a1 | 866 | void |
867 | channel_handler_init_20(void) | |
868 | { | |
869 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_20; | |
0b242b12 | 870 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
7e7327a1 | 871 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; |
fa08c86b | 872 | channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener; |
0b242b12 | 873 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
fa08c86b | 874 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; |
97fb6912 | 875 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
7e7327a1 | 876 | |
877 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open_2; | |
878 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; | |
fa08c86b | 879 | channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener; |
0b242b12 | 880 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
fa08c86b | 881 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; |
97fb6912 | 882 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
7e7327a1 | 883 | } |
884 | ||
7368a6c8 | 885 | void |
886 | channel_handler_init_13(void) | |
887 | { | |
888 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13; | |
889 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_13; | |
890 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; | |
891 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; | |
892 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; | |
893 | channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining; | |
894 | channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining; | |
97fb6912 | 895 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
7368a6c8 | 896 | |
897 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open_1; | |
898 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; | |
899 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; | |
900 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; | |
901 | channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13; | |
97fb6912 | 902 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
7368a6c8 | 903 | } |
5260325f | 904 | |
7368a6c8 | 905 | void |
906 | channel_handler_init_15(void) | |
907 | { | |
908 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_15; | |
0b242b12 | 909 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
7368a6c8 | 910 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
911 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; | |
912 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; | |
97fb6912 | 913 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
7368a6c8 | 914 | |
915 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; | |
916 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; | |
917 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; | |
918 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open_1; | |
97fb6912 | 919 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
7368a6c8 | 920 | } |
921 | ||
922 | void | |
923 | channel_handler_init(void) | |
924 | { | |
925 | int i; | |
926 | for(i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) { | |
927 | channel_pre[i] = NULL; | |
928 | channel_post[i] = NULL; | |
929 | } | |
7e7327a1 | 930 | if (compat20) |
931 | channel_handler_init_20(); | |
932 | else if (compat13) | |
7368a6c8 | 933 | channel_handler_init_13(); |
934 | else | |
935 | channel_handler_init_15(); | |
936 | } | |
937 | ||
6ae2364d | 938 | void |
7368a6c8 | 939 | channel_handler(chan_fn *ftab[], fd_set * readset, fd_set * writeset) |
940 | { | |
941 | static int did_init = 0; | |
942 | int i; | |
943 | Channel *c; | |
944 | ||
945 | if (!did_init) { | |
946 | channel_handler_init(); | |
947 | did_init = 1; | |
948 | } | |
949 | for (i = 0; i < channels_alloc; i++) { | |
950 | c = &channels[i]; | |
951 | if (c->type == SSH_CHANNEL_FREE) | |
5260325f | 952 | continue; |
7368a6c8 | 953 | if (ftab[c->type] == NULL) |
954 | continue; | |
955 | (*ftab[c->type])(c, readset, writeset); | |
7e7327a1 | 956 | chan_delete_if_full_closed(c); |
8efc0c15 | 957 | } |
8efc0c15 | 958 | } |
959 | ||
6ae2364d | 960 | void |
7368a6c8 | 961 | channel_prepare_select(fd_set * readset, fd_set * writeset) |
962 | { | |
963 | channel_handler(channel_pre, readset, writeset); | |
964 | } | |
965 | ||
6ae2364d | 966 | void |
7368a6c8 | 967 | channel_after_select(fd_set * readset, fd_set * writeset) |
968 | { | |
969 | channel_handler(channel_post, readset, writeset); | |
970 | } | |
971 | ||
8efc0c15 | 972 | /* If there is data to send to the connection, send some of it now. */ |
973 | ||
6ae2364d | 974 | void |
5260325f | 975 | channel_output_poll() |
8efc0c15 | 976 | { |
5260325f | 977 | int len, i; |
7368a6c8 | 978 | Channel *c; |
5260325f | 979 | |
980 | for (i = 0; i < channels_alloc; i++) { | |
7368a6c8 | 981 | c = &channels[i]; |
48e671d5 | 982 | |
aa3378df | 983 | /* We are only interested in channels that can have buffered incoming data. */ |
48e671d5 | 984 | if (compat13) { |
7368a6c8 | 985 | if (c->type != SSH_CHANNEL_OPEN && |
986 | c->type != SSH_CHANNEL_INPUT_DRAINING) | |
48e671d5 | 987 | continue; |
988 | } else { | |
7368a6c8 | 989 | if (c->type != SSH_CHANNEL_OPEN) |
48e671d5 | 990 | continue; |
7368a6c8 | 991 | if (c->istate != CHAN_INPUT_OPEN && |
992 | c->istate != CHAN_INPUT_WAIT_DRAIN) | |
48e671d5 | 993 | continue; |
994 | } | |
e78a59f5 | 995 | if (compat20 && |
996 | (c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) { | |
7e7327a1 | 997 | debug("channel: %d: no data after CLOSE", c->self); |
998 | continue; | |
999 | } | |
5260325f | 1000 | |
1001 | /* Get the amount of buffered data for this channel. */ | |
7368a6c8 | 1002 | len = buffer_len(&c->input); |
5260325f | 1003 | if (len > 0) { |
aa3378df | 1004 | /* Send some data for the other side over the secure connection. */ |
7e7327a1 | 1005 | if (compat20) { |
1006 | if (len > c->remote_window) | |
1007 | len = c->remote_window; | |
1008 | if (len > c->remote_maxpacket) | |
1009 | len = c->remote_maxpacket; | |
5260325f | 1010 | } else { |
7e7327a1 | 1011 | if (packet_is_interactive()) { |
1012 | if (len > 1024) | |
1013 | len = 512; | |
1014 | } else { | |
1015 | /* Keep the packets at reasonable size. */ | |
1016 | if (len > packet_get_maxsize()/2) | |
1017 | len = packet_get_maxsize()/2; | |
1018 | } | |
5260325f | 1019 | } |
7368a6c8 | 1020 | if (len > 0) { |
7e7327a1 | 1021 | packet_start(compat20 ? |
1022 | SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA); | |
7368a6c8 | 1023 | packet_put_int(c->remote_id); |
1024 | packet_put_string(buffer_ptr(&c->input), len); | |
1025 | packet_send(); | |
1026 | buffer_consume(&c->input, len); | |
1027 | c->remote_window -= len; | |
7368a6c8 | 1028 | } |
1029 | } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) { | |
5260325f | 1030 | if (compat13) |
1031 | fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3"); | |
aa3378df | 1032 | /* |
1033 | * input-buffer is empty and read-socket shutdown: | |
1034 | * tell peer, that we will not send more data: send IEOF | |
1035 | */ | |
7368a6c8 | 1036 | chan_ibuf_empty(c); |
5260325f | 1037 | } |
7e7327a1 | 1038 | /* Send extended data, i.e. stderr */ |
1039 | if (compat20 && | |
1040 | c->remote_window > 0 && | |
1041 | (len = buffer_len(&c->extended)) > 0 && | |
1042 | c->extended_usage == CHAN_EXTENDED_READ) { | |
1043 | if (len > c->remote_window) | |
1044 | len = c->remote_window; | |
1045 | if (len > c->remote_maxpacket) | |
1046 | len = c->remote_maxpacket; | |
1047 | packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA); | |
1048 | packet_put_int(c->remote_id); | |
1049 | packet_put_int(SSH2_EXTENDED_DATA_STDERR); | |
1050 | packet_put_string(buffer_ptr(&c->extended), len); | |
1051 | packet_send(); | |
1052 | buffer_consume(&c->extended, len); | |
1053 | c->remote_window -= len; | |
1054 | } | |
8efc0c15 | 1055 | } |
8efc0c15 | 1056 | } |
1057 | ||
aa3378df | 1058 | /* |
1059 | * This is called when a packet of type CHANNEL_DATA has just been received. | |
1060 | * The message type has already been consumed, but channel number and data is | |
1061 | * still there. | |
1062 | */ | |
8efc0c15 | 1063 | |
6ae2364d | 1064 | void |
188adeb2 | 1065 | channel_input_data(int type, int plen, void *ctxt) |
8efc0c15 | 1066 | { |
48e671d5 | 1067 | int id; |
5260325f | 1068 | char *data; |
1069 | unsigned int data_len; | |
7368a6c8 | 1070 | Channel *c; |
5260325f | 1071 | |
1072 | /* Get the channel number and verify it. */ | |
48e671d5 | 1073 | id = packet_get_int(); |
7368a6c8 | 1074 | c = channel_lookup(id); |
1075 | if (c == NULL) | |
48e671d5 | 1076 | packet_disconnect("Received data for nonexistent channel %d.", id); |
5260325f | 1077 | |
1078 | /* Ignore any data for non-open channels (might happen on close) */ | |
7368a6c8 | 1079 | if (c->type != SSH_CHANNEL_OPEN && |
1080 | c->type != SSH_CHANNEL_X11_OPEN) | |
48e671d5 | 1081 | return; |
1082 | ||
1083 | /* same for protocol 1.5 if output end is no longer open */ | |
7368a6c8 | 1084 | if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN) |
5260325f | 1085 | return; |
1086 | ||
1087 | /* Get the data. */ | |
1088 | data = packet_get_string(&data_len); | |
6ae2364d | 1089 | packet_done(); |
7368a6c8 | 1090 | |
7e7327a1 | 1091 | if (compat20){ |
1092 | if (data_len > c->local_maxpacket) { | |
1093 | log("channel %d: rcvd big packet %d, maxpack %d", | |
1094 | c->self, data_len, c->local_maxpacket); | |
1095 | } | |
1096 | if (data_len > c->local_window) { | |
1097 | log("channel %d: rcvd too much data %d, win %d", | |
1098 | c->self, data_len, c->local_window); | |
1099 | xfree(data); | |
1100 | return; | |
1101 | } | |
1102 | c->local_window -= data_len; | |
1103 | }else{ | |
1104 | packet_integrity_check(plen, 4 + 4 + data_len, type); | |
1105 | } | |
7368a6c8 | 1106 | buffer_append(&c->output, data, data_len); |
5260325f | 1107 | xfree(data); |
8efc0c15 | 1108 | } |
6ae2364d | 1109 | void |
188adeb2 | 1110 | channel_input_extended_data(int type, int plen, void *ctxt) |
7e7327a1 | 1111 | { |
1112 | int id; | |
1113 | int tcode; | |
1114 | char *data; | |
1115 | unsigned int data_len; | |
1116 | Channel *c; | |
1117 | ||
1118 | /* Get the channel number and verify it. */ | |
1119 | id = packet_get_int(); | |
1120 | c = channel_lookup(id); | |
1121 | ||
1122 | if (c == NULL) | |
1123 | packet_disconnect("Received extended_data for bad channel %d.", id); | |
1124 | if (c->type != SSH_CHANNEL_OPEN) { | |
1125 | log("channel %d: ext data for non open", id); | |
1126 | return; | |
1127 | } | |
1128 | tcode = packet_get_int(); | |
1129 | if (c->efd == -1 || | |
1130 | c->extended_usage != CHAN_EXTENDED_WRITE || | |
1131 | tcode != SSH2_EXTENDED_DATA_STDERR) { | |
1132 | log("channel %d: bad ext data", c->self); | |
1133 | return; | |
1134 | } | |
1135 | data = packet_get_string(&data_len); | |
6ae2364d | 1136 | packet_done(); |
7e7327a1 | 1137 | if (data_len > c->local_window) { |
1138 | log("channel %d: rcvd too much extended_data %d, win %d", | |
1139 | c->self, data_len, c->local_window); | |
1140 | xfree(data); | |
1141 | return; | |
1142 | } | |
de273eef | 1143 | debug2("channel %d: rcvd ext data %d", c->self, data_len); |
7e7327a1 | 1144 | c->local_window -= data_len; |
1145 | buffer_append(&c->extended, data, data_len); | |
1146 | xfree(data); | |
1147 | } | |
1148 | ||
8efc0c15 | 1149 | |
aa3378df | 1150 | /* |
1151 | * Returns true if no channel has too much buffered data, and false if one or | |
1152 | * more channel is overfull. | |
1153 | */ | |
8efc0c15 | 1154 | |
6ae2364d | 1155 | int |
5260325f | 1156 | channel_not_very_much_buffered_data() |
8efc0c15 | 1157 | { |
5260325f | 1158 | unsigned int i; |
7368a6c8 | 1159 | Channel *c; |
5260325f | 1160 | |
1161 | for (i = 0; i < channels_alloc; i++) { | |
7368a6c8 | 1162 | c = &channels[i]; |
1163 | if (c->type == SSH_CHANNEL_OPEN) { | |
7e7327a1 | 1164 | if (!compat20 && buffer_len(&c->input) > packet_get_maxsize()) { |
7368a6c8 | 1165 | debug("channel %d: big input buffer %d", |
1166 | c->self, buffer_len(&c->input)); | |
5260325f | 1167 | return 0; |
7368a6c8 | 1168 | } |
1169 | if (buffer_len(&c->output) > packet_get_maxsize()) { | |
1170 | debug("channel %d: big output buffer %d", | |
1171 | c->self, buffer_len(&c->output)); | |
5260325f | 1172 | return 0; |
7368a6c8 | 1173 | } |
5260325f | 1174 | } |
8efc0c15 | 1175 | } |
5260325f | 1176 | return 1; |
8efc0c15 | 1177 | } |
1178 | ||
6ae2364d | 1179 | void |
188adeb2 | 1180 | channel_input_ieof(int type, int plen, void *ctxt) |
7368a6c8 | 1181 | { |
1182 | int id; | |
1183 | Channel *c; | |
1184 | ||
1185 | packet_integrity_check(plen, 4, type); | |
1186 | ||
1187 | id = packet_get_int(); | |
1188 | c = channel_lookup(id); | |
1189 | if (c == NULL) | |
1190 | packet_disconnect("Received ieof for nonexistent channel %d.", id); | |
1191 | chan_rcvd_ieof(c); | |
1192 | } | |
8efc0c15 | 1193 | |
6ae2364d | 1194 | void |
188adeb2 | 1195 | channel_input_close(int type, int plen, void *ctxt) |
8efc0c15 | 1196 | { |
7368a6c8 | 1197 | int id; |
1198 | Channel *c; | |
5260325f | 1199 | |
7368a6c8 | 1200 | packet_integrity_check(plen, 4, type); |
1201 | ||
1202 | id = packet_get_int(); | |
1203 | c = channel_lookup(id); | |
1204 | if (c == NULL) | |
1205 | packet_disconnect("Received close for nonexistent channel %d.", id); | |
aa3378df | 1206 | |
1207 | /* | |
1208 | * Send a confirmation that we have closed the channel and no more | |
1209 | * data is coming for it. | |
1210 | */ | |
5260325f | 1211 | packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION); |
7368a6c8 | 1212 | packet_put_int(c->remote_id); |
5260325f | 1213 | packet_send(); |
1214 | ||
aa3378df | 1215 | /* |
1216 | * If the channel is in closed state, we have sent a close request, | |
1217 | * and the other side will eventually respond with a confirmation. | |
1218 | * Thus, we cannot free the channel here, because then there would be | |
1219 | * no-one to receive the confirmation. The channel gets freed when | |
1220 | * the confirmation arrives. | |
1221 | */ | |
7368a6c8 | 1222 | if (c->type != SSH_CHANNEL_CLOSED) { |
aa3378df | 1223 | /* |
1224 | * Not a closed channel - mark it as draining, which will | |
1225 | * cause it to be freed later. | |
1226 | */ | |
7368a6c8 | 1227 | buffer_consume(&c->input, buffer_len(&c->input)); |
1228 | c->type = SSH_CHANNEL_OUTPUT_DRAINING; | |
5260325f | 1229 | } |
8efc0c15 | 1230 | } |
1231 | ||
7368a6c8 | 1232 | /* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */ |
6ae2364d | 1233 | void |
188adeb2 | 1234 | channel_input_oclose(int type, int plen, void *ctxt) |
8efc0c15 | 1235 | { |
7368a6c8 | 1236 | int id = packet_get_int(); |
1237 | Channel *c = channel_lookup(id); | |
1238 | packet_integrity_check(plen, 4, type); | |
1239 | if (c == NULL) | |
1240 | packet_disconnect("Received oclose for nonexistent channel %d.", id); | |
1241 | chan_rcvd_oclose(c); | |
8efc0c15 | 1242 | } |
1243 | ||
6ae2364d | 1244 | void |
188adeb2 | 1245 | channel_input_close_confirmation(int type, int plen, void *ctxt) |
7368a6c8 | 1246 | { |
1247 | int id = packet_get_int(); | |
1248 | Channel *c = channel_lookup(id); | |
1249 | ||
6ae2364d | 1250 | packet_done(); |
7368a6c8 | 1251 | if (c == NULL) |
1252 | packet_disconnect("Received close confirmation for " | |
1253 | "out-of-range channel %d.", id); | |
1254 | if (c->type != SSH_CHANNEL_CLOSED) | |
1255 | packet_disconnect("Received close confirmation for " | |
1256 | "non-closed channel %d (type %d).", id, c->type); | |
1257 | channel_free(c->self); | |
1258 | } | |
8efc0c15 | 1259 | |
6ae2364d | 1260 | void |
188adeb2 | 1261 | channel_input_open_confirmation(int type, int plen, void *ctxt) |
8efc0c15 | 1262 | { |
7368a6c8 | 1263 | int id, remote_id; |
1264 | Channel *c; | |
5260325f | 1265 | |
7e7327a1 | 1266 | if (!compat20) |
1267 | packet_integrity_check(plen, 4 + 4, type); | |
5260325f | 1268 | |
7368a6c8 | 1269 | id = packet_get_int(); |
1270 | c = channel_lookup(id); | |
5260325f | 1271 | |
7368a6c8 | 1272 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) |
1273 | packet_disconnect("Received open confirmation for " | |
1274 | "non-opening channel %d.", id); | |
1275 | remote_id = packet_get_int(); | |
aa3378df | 1276 | /* Record the remote channel number and mark that the channel is now open. */ |
7368a6c8 | 1277 | c->remote_id = remote_id; |
1278 | c->type = SSH_CHANNEL_OPEN; | |
7e7327a1 | 1279 | |
1280 | if (compat20) { | |
1281 | c->remote_window = packet_get_int(); | |
1282 | c->remote_maxpacket = packet_get_int(); | |
6ae2364d | 1283 | packet_done(); |
7e7327a1 | 1284 | if (c->cb_fn != NULL && c->cb_event == type) { |
de273eef | 1285 | debug2("callback start"); |
7e7327a1 | 1286 | c->cb_fn(c->self, c->cb_arg); |
de273eef | 1287 | debug2("callback done"); |
7e7327a1 | 1288 | } |
1289 | debug("channel %d: open confirm rwindow %d rmax %d", c->self, | |
1290 | c->remote_window, c->remote_maxpacket); | |
1291 | } | |
8efc0c15 | 1292 | } |
1293 | ||
6ae2364d | 1294 | void |
188adeb2 | 1295 | channel_input_open_failure(int type, int plen, void *ctxt) |
8efc0c15 | 1296 | { |
7368a6c8 | 1297 | int id; |
1298 | Channel *c; | |
5260325f | 1299 | |
7e7327a1 | 1300 | if (!compat20) |
1301 | packet_integrity_check(plen, 4, type); | |
7368a6c8 | 1302 | |
1303 | id = packet_get_int(); | |
1304 | c = channel_lookup(id); | |
1305 | ||
1306 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) | |
1307 | packet_disconnect("Received open failure for " | |
1308 | "non-opening channel %d.", id); | |
7e7327a1 | 1309 | if (compat20) { |
1310 | int reason = packet_get_int(); | |
1311 | char *msg = packet_get_string(NULL); | |
6ae2364d | 1312 | char *lang = packet_get_string(NULL); |
7e7327a1 | 1313 | log("channel_open_failure: %d: reason %d: %s", id, reason, msg); |
6ae2364d | 1314 | packet_done(); |
7e7327a1 | 1315 | xfree(msg); |
6ae2364d | 1316 | xfree(lang); |
7e7327a1 | 1317 | } |
5260325f | 1318 | /* Free the channel. This will also close the socket. */ |
7368a6c8 | 1319 | channel_free(id); |
8efc0c15 | 1320 | } |
1321 | ||
7e7327a1 | 1322 | void |
188adeb2 | 1323 | channel_input_channel_request(int type, int plen, void *ctxt) |
7e7327a1 | 1324 | { |
1325 | int id; | |
1326 | Channel *c; | |
1327 | ||
1328 | id = packet_get_int(); | |
1329 | c = channel_lookup(id); | |
1330 | ||
1331 | if (c == NULL || | |
1332 | (c->type != SSH_CHANNEL_OPEN && c->type != SSH_CHANNEL_LARVAL)) | |
1333 | packet_disconnect("Received request for " | |
1334 | "non-open channel %d.", id); | |
1335 | if (c->cb_fn != NULL && c->cb_event == type) { | |
de273eef | 1336 | debug2("callback start"); |
7e7327a1 | 1337 | c->cb_fn(c->self, c->cb_arg); |
de273eef | 1338 | debug2("callback done"); |
7e7327a1 | 1339 | } else { |
1340 | char *service = packet_get_string(NULL); | |
1341 | debug("channel: %d rcvd request for %s", c->self, service); | |
de273eef | 1342 | debug("cb_fn %p cb_event %d", c->cb_fn , c->cb_event); |
7e7327a1 | 1343 | xfree(service); |
1344 | } | |
1345 | } | |
1346 | ||
6ae2364d | 1347 | void |
188adeb2 | 1348 | channel_input_window_adjust(int type, int plen, void *ctxt) |
7e7327a1 | 1349 | { |
1350 | Channel *c; | |
1351 | int id, adjust; | |
1352 | ||
1353 | if (!compat20) | |
1354 | return; | |
1355 | ||
1356 | /* Get the channel number and verify it. */ | |
1357 | id = packet_get_int(); | |
1358 | c = channel_lookup(id); | |
1359 | ||
1360 | if (c == NULL || c->type != SSH_CHANNEL_OPEN) { | |
1361 | log("Received window adjust for " | |
1362 | "non-open channel %d.", id); | |
1363 | return; | |
1364 | } | |
1365 | adjust = packet_get_int(); | |
6ae2364d | 1366 | packet_done(); |
de273eef | 1367 | debug2("channel %d: rcvd adjust %d", id, adjust); |
7e7327a1 | 1368 | c->remote_window += adjust; |
1369 | } | |
1370 | ||
aa3378df | 1371 | /* |
1372 | * Stops listening for channels, and removes any unix domain sockets that we | |
1373 | * might have. | |
1374 | */ | |
8efc0c15 | 1375 | |
6ae2364d | 1376 | void |
5260325f | 1377 | channel_stop_listening() |
8efc0c15 | 1378 | { |
5260325f | 1379 | int i; |
1380 | for (i = 0; i < channels_alloc; i++) { | |
1381 | switch (channels[i].type) { | |
1382 | case SSH_CHANNEL_AUTH_SOCKET: | |
1383 | close(channels[i].sock); | |
77bb0bca | 1384 | unlink(channels[i].path); |
5260325f | 1385 | channel_free(i); |
1386 | break; | |
1387 | case SSH_CHANNEL_PORT_LISTENER: | |
fa08c86b | 1388 | case SSH_CHANNEL_RPORT_LISTENER: |
5260325f | 1389 | case SSH_CHANNEL_X11_LISTENER: |
1390 | close(channels[i].sock); | |
1391 | channel_free(i); | |
1392 | break; | |
1393 | default: | |
1394 | break; | |
1395 | } | |
8efc0c15 | 1396 | } |
8efc0c15 | 1397 | } |
1398 | ||
aa3378df | 1399 | /* |
0fbe8c74 | 1400 | * Closes the sockets/fds of all channels. This is used to close extra file |
aa3378df | 1401 | * descriptors after a fork. |
1402 | */ | |
8efc0c15 | 1403 | |
6ae2364d | 1404 | void |
5260325f | 1405 | channel_close_all() |
8efc0c15 | 1406 | { |
5260325f | 1407 | int i; |
0fbe8c74 | 1408 | for (i = 0; i < channels_alloc; i++) |
5260325f | 1409 | if (channels[i].type != SSH_CHANNEL_FREE) |
0fbe8c74 | 1410 | channel_close_fds(&channels[i]); |
8efc0c15 | 1411 | } |
1412 | ||
1413 | /* Returns the maximum file descriptor number used by the channels. */ | |
1414 | ||
6ae2364d | 1415 | int |
5260325f | 1416 | channel_max_fd() |
8efc0c15 | 1417 | { |
5260325f | 1418 | return channel_max_fd_value; |
8efc0c15 | 1419 | } |
1420 | ||
1421 | /* Returns true if any channel is still open. */ | |
1422 | ||
6ae2364d | 1423 | int |
5260325f | 1424 | channel_still_open() |
8efc0c15 | 1425 | { |
5260325f | 1426 | unsigned int i; |
1427 | for (i = 0; i < channels_alloc; i++) | |
1428 | switch (channels[i].type) { | |
1429 | case SSH_CHANNEL_FREE: | |
1430 | case SSH_CHANNEL_X11_LISTENER: | |
1431 | case SSH_CHANNEL_PORT_LISTENER: | |
fa08c86b | 1432 | case SSH_CHANNEL_RPORT_LISTENER: |
5260325f | 1433 | case SSH_CHANNEL_CLOSED: |
1434 | case SSH_CHANNEL_AUTH_SOCKET: | |
97fb6912 | 1435 | case SSH_CHANNEL_CONNECTING: /* XXX ??? */ |
5260325f | 1436 | continue; |
7e7327a1 | 1437 | case SSH_CHANNEL_LARVAL: |
1438 | if (!compat20) | |
1439 | fatal("cannot happen: SSH_CHANNEL_LARVAL"); | |
1440 | continue; | |
5260325f | 1441 | case SSH_CHANNEL_OPENING: |
1442 | case SSH_CHANNEL_OPEN: | |
1443 | case SSH_CHANNEL_X11_OPEN: | |
1444 | return 1; | |
1445 | case SSH_CHANNEL_INPUT_DRAINING: | |
1446 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
1447 | if (!compat13) | |
1448 | fatal("cannot happen: OUT_DRAIN"); | |
1449 | return 1; | |
1450 | default: | |
1451 | fatal("channel_still_open: bad channel type %d", channels[i].type); | |
1452 | /* NOTREACHED */ | |
1453 | } | |
1454 | return 0; | |
8efc0c15 | 1455 | } |
1456 | ||
aa3378df | 1457 | /* |
1458 | * Returns a message describing the currently open forwarded connections, | |
1459 | * suitable for sending to the client. The message contains crlf pairs for | |
1460 | * newlines. | |
1461 | */ | |
8efc0c15 | 1462 | |
5260325f | 1463 | char * |
1464 | channel_open_message() | |
8efc0c15 | 1465 | { |
5260325f | 1466 | Buffer buffer; |
1467 | int i; | |
1468 | char buf[512], *cp; | |
1469 | ||
1470 | buffer_init(&buffer); | |
1471 | snprintf(buf, sizeof buf, "The following connections are open:\r\n"); | |
8efc0c15 | 1472 | buffer_append(&buffer, buf, strlen(buf)); |
5260325f | 1473 | for (i = 0; i < channels_alloc; i++) { |
1474 | Channel *c = &channels[i]; | |
1475 | switch (c->type) { | |
1476 | case SSH_CHANNEL_FREE: | |
1477 | case SSH_CHANNEL_X11_LISTENER: | |
1478 | case SSH_CHANNEL_PORT_LISTENER: | |
fa08c86b | 1479 | case SSH_CHANNEL_RPORT_LISTENER: |
5260325f | 1480 | case SSH_CHANNEL_CLOSED: |
1481 | case SSH_CHANNEL_AUTH_SOCKET: | |
1482 | continue; | |
7e7327a1 | 1483 | case SSH_CHANNEL_LARVAL: |
5260325f | 1484 | case SSH_CHANNEL_OPENING: |
97fb6912 | 1485 | case SSH_CHANNEL_CONNECTING: |
5260325f | 1486 | case SSH_CHANNEL_OPEN: |
1487 | case SSH_CHANNEL_X11_OPEN: | |
1488 | case SSH_CHANNEL_INPUT_DRAINING: | |
1489 | case SSH_CHANNEL_OUTPUT_DRAINING: | |
7368a6c8 | 1490 | snprintf(buf, sizeof buf, " #%d %.300s (t%d r%d i%d/%d o%d/%d fd %d/%d)\r\n", |
48e671d5 | 1491 | c->self, c->remote_name, |
1492 | c->type, c->remote_id, | |
1493 | c->istate, buffer_len(&c->input), | |
7368a6c8 | 1494 | c->ostate, buffer_len(&c->output), |
1495 | c->rfd, c->wfd); | |
5260325f | 1496 | buffer_append(&buffer, buf, strlen(buf)); |
1497 | continue; | |
1498 | default: | |
7368a6c8 | 1499 | fatal("channel_open_message: bad channel type %d", c->type); |
5260325f | 1500 | /* NOTREACHED */ |
1501 | } | |
1502 | } | |
1503 | buffer_append(&buffer, "\0", 1); | |
1504 | cp = xstrdup(buffer_ptr(&buffer)); | |
1505 | buffer_free(&buffer); | |
1506 | return cp; | |
8efc0c15 | 1507 | } |
1508 | ||
aa3378df | 1509 | /* |
1510 | * Initiate forwarding of connections to local port "port" through the secure | |
1511 | * channel to host:port from remote side. | |
1512 | */ | |
fa08c86b | 1513 | void |
1514 | channel_request_local_forwarding(u_short listen_port, const char *host_to_connect, | |
1515 | u_short port_to_connect, int gateway_ports) | |
1516 | { | |
1517 | channel_request_forwarding( | |
1518 | NULL, listen_port, | |
1519 | host_to_connect, port_to_connect, | |
1520 | gateway_ports, /*remote_fwd*/ 0); | |
1521 | } | |
8efc0c15 | 1522 | |
fa08c86b | 1523 | /* |
1524 | * If 'remote_fwd' is true we have a '-R style' listener for protocol 2 | |
1525 | * (SSH_CHANNEL_RPORT_LISTENER). | |
1526 | */ | |
6ae2364d | 1527 | void |
fa08c86b | 1528 | channel_request_forwarding( |
1529 | const char *listen_address, u_short listen_port, | |
1530 | const char *host_to_connect, u_short port_to_connect, | |
1531 | int gateway_ports, int remote_fwd) | |
8efc0c15 | 1532 | { |
fa08c86b | 1533 | int success, ch, sock, on = 1, ctype; |
48e671d5 | 1534 | struct addrinfo hints, *ai, *aitop; |
1535 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; | |
fa08c86b | 1536 | const char *host; |
aa3378df | 1537 | struct linger linger; |
5260325f | 1538 | |
fa08c86b | 1539 | if (remote_fwd) { |
1540 | host = listen_address; | |
1541 | ctype = SSH_CHANNEL_RPORT_LISTENER; | |
1542 | } else { | |
1543 | host = host_to_connect; | |
1544 | ctype =SSH_CHANNEL_PORT_LISTENER; | |
1545 | } | |
1546 | ||
5260325f | 1547 | if (strlen(host) > sizeof(channels[0].path) - 1) |
1548 | packet_disconnect("Forward host name too long."); | |
1549 | ||
fa08c86b | 1550 | /* XXX listen_address is currently ignored */ |
aa3378df | 1551 | /* |
48e671d5 | 1552 | * getaddrinfo returns a loopback address if the hostname is |
1553 | * set to NULL and hints.ai_flags is not AI_PASSIVE | |
aa3378df | 1554 | */ |
48e671d5 | 1555 | memset(&hints, 0, sizeof(hints)); |
1556 | hints.ai_family = IPv4or6; | |
1557 | hints.ai_flags = gateway_ports ? AI_PASSIVE : 0; | |
1558 | hints.ai_socktype = SOCK_STREAM; | |
fa08c86b | 1559 | snprintf(strport, sizeof strport, "%d", listen_port); |
48e671d5 | 1560 | if (getaddrinfo(NULL, strport, &hints, &aitop) != 0) |
1561 | packet_disconnect("getaddrinfo: fatal error"); | |
1562 | ||
1563 | success = 0; | |
1564 | for (ai = aitop; ai; ai = ai->ai_next) { | |
1565 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
1566 | continue; | |
1567 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), | |
1568 | strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { | |
fa08c86b | 1569 | error("channel_request_forwarding: getnameinfo failed"); |
48e671d5 | 1570 | continue; |
1571 | } | |
1572 | /* Create a port to listen for the host. */ | |
1573 | sock = socket(ai->ai_family, SOCK_STREAM, 0); | |
1574 | if (sock < 0) { | |
1575 | /* this is no error since kernel may not support ipv6 */ | |
1576 | verbose("socket: %.100s", strerror(errno)); | |
1577 | continue; | |
1578 | } | |
1579 | /* | |
1580 | * Set socket options. We would like the socket to disappear | |
1581 | * as soon as it has been closed for whatever reason. | |
1582 | */ | |
1583 | setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void *)&on, sizeof(on)); | |
1584 | linger.l_onoff = 1; | |
1585 | linger.l_linger = 5; | |
1586 | setsockopt(sock, SOL_SOCKET, SO_LINGER, (void *)&linger, sizeof(linger)); | |
1587 | debug("Local forwarding listening on %s port %s.", ntop, strport); | |
1588 | ||
1589 | /* Bind the socket to the address. */ | |
1590 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { | |
1591 | /* address can be in use ipv6 address is already bound */ | |
16218745 | 1592 | if (!ai->ai_next) |
1593 | error("bind: %.100s", strerror(errno)); | |
1594 | else | |
1595 | verbose("bind: %.100s", strerror(errno)); | |
1596 | ||
48e671d5 | 1597 | close(sock); |
1598 | continue; | |
1599 | } | |
1600 | /* Start listening for connections on the socket. */ | |
1601 | if (listen(sock, 5) < 0) { | |
1602 | error("listen: %.100s", strerror(errno)); | |
1603 | close(sock); | |
1604 | continue; | |
1605 | } | |
1606 | /* Allocate a channel number for the socket. */ | |
fa08c86b | 1607 | ch = channel_new("port listener", ctype, sock, sock, -1, |
0b242b12 | 1608 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, |
a22aff1f | 1609 | 0, xstrdup("port listener"), 1); |
48e671d5 | 1610 | strlcpy(channels[ch].path, host, sizeof(channels[ch].path)); |
fa08c86b | 1611 | channels[ch].host_port = port_to_connect; |
1612 | channels[ch].listening_port = listen_port; | |
48e671d5 | 1613 | success = 1; |
1614 | } | |
1615 | if (success == 0) | |
fa08c86b | 1616 | packet_disconnect("cannot listen port: %d", listen_port); /*XXX ?disconnect? */ |
48e671d5 | 1617 | freeaddrinfo(aitop); |
5260325f | 1618 | } |
8efc0c15 | 1619 | |
aa3378df | 1620 | /* |
1621 | * Initiate forwarding of connections to port "port" on remote host through | |
1622 | * the secure channel to host:port from local side. | |
1623 | */ | |
8efc0c15 | 1624 | |
6ae2364d | 1625 | void |
fa08c86b | 1626 | channel_request_remote_forwarding(u_short listen_port, |
1627 | const char *host_to_connect, u_short port_to_connect) | |
8efc0c15 | 1628 | { |
fa08c86b | 1629 | int payload_len, type, success = 0; |
1630 | ||
5260325f | 1631 | /* Record locally that connection to this host/port is permitted. */ |
1632 | if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) | |
1633 | fatal("channel_request_remote_forwarding: too many forwards"); | |
1634 | ||
5260325f | 1635 | /* Send the forward request to the remote side. */ |
7e7327a1 | 1636 | if (compat20) { |
1637 | const char *address_to_bind = "0.0.0.0"; | |
1638 | packet_start(SSH2_MSG_GLOBAL_REQUEST); | |
1639 | packet_put_cstring("tcpip-forward"); | |
1640 | packet_put_char(0); /* boolean: want reply */ | |
1641 | packet_put_cstring(address_to_bind); | |
1642 | packet_put_int(listen_port); | |
fa08c86b | 1643 | packet_send(); |
1644 | packet_write_wait(); | |
1645 | /* Assume that server accepts the request */ | |
1646 | success = 1; | |
7e7327a1 | 1647 | } else { |
1648 | packet_start(SSH_CMSG_PORT_FORWARD_REQUEST); | |
7e7327a1 | 1649 | packet_put_int(listen_port); |
d6f24e45 | 1650 | packet_put_cstring(host_to_connect); |
1651 | packet_put_int(port_to_connect); | |
7e7327a1 | 1652 | packet_send(); |
1653 | packet_write_wait(); | |
fa08c86b | 1654 | |
1655 | /* Wait for response from the remote side. */ | |
1656 | type = packet_read(&payload_len); | |
1657 | switch (type) { | |
1658 | case SSH_SMSG_SUCCESS: | |
1659 | success = 1; | |
1660 | break; | |
1661 | case SSH_SMSG_FAILURE: | |
1662 | log("Warning: Server denied remote port forwarding."); | |
1663 | break; | |
1664 | default: | |
1665 | /* Unknown packet */ | |
1666 | packet_disconnect("Protocol error for port forward request:" | |
1667 | "received packet type %d.", type); | |
1668 | } | |
1669 | } | |
1670 | if (success) { | |
1671 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host_to_connect); | |
1672 | permitted_opens[num_permitted_opens].port_to_connect = port_to_connect; | |
1673 | permitted_opens[num_permitted_opens].listen_port = listen_port; | |
1674 | num_permitted_opens++; | |
7e7327a1 | 1675 | } |
8efc0c15 | 1676 | } |
1677 | ||
aa3378df | 1678 | /* |
1679 | * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates | |
1680 | * listening for the port, and sends back a success reply (or disconnect | |
1681 | * message if there was an error). This never returns if there was an error. | |
1682 | */ | |
8efc0c15 | 1683 | |
6ae2364d | 1684 | void |
1d1ffb87 | 1685 | channel_input_port_forward_request(int is_root, int gateway_ports) |
8efc0c15 | 1686 | { |
57112b5a | 1687 | u_short port, host_port; |
5260325f | 1688 | char *hostname; |
1689 | ||
1690 | /* Get arguments from the packet. */ | |
1691 | port = packet_get_int(); | |
1692 | hostname = packet_get_string(NULL); | |
1693 | host_port = packet_get_int(); | |
1694 | ||
3c62e7eb | 1695 | #ifndef HAVE_CYGWIN |
aa3378df | 1696 | /* |
1697 | * Check that an unprivileged user is not trying to forward a | |
1698 | * privileged port. | |
1699 | */ | |
5260325f | 1700 | if (port < IPPORT_RESERVED && !is_root) |
1701 | packet_disconnect("Requested forwarding of port %d but user is not root.", | |
1702 | port); | |
3c62e7eb | 1703 | #endif |
fa08c86b | 1704 | /* Initiate forwarding */ |
1d1ffb87 | 1705 | channel_request_local_forwarding(port, hostname, host_port, gateway_ports); |
5260325f | 1706 | |
1707 | /* Free the argument string. */ | |
1708 | xfree(hostname); | |
8efc0c15 | 1709 | } |
1710 | ||
7368a6c8 | 1711 | /* XXX move to aux.c */ |
1712 | int | |
1713 | channel_connect_to(const char *host, u_short host_port) | |
8efc0c15 | 1714 | { |
48e671d5 | 1715 | struct addrinfo hints, *ai, *aitop; |
1716 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; | |
1717 | int gaierr; | |
7368a6c8 | 1718 | int sock = -1; |
48e671d5 | 1719 | |
1720 | memset(&hints, 0, sizeof(hints)); | |
1721 | hints.ai_family = IPv4or6; | |
1722 | hints.ai_socktype = SOCK_STREAM; | |
1723 | snprintf(strport, sizeof strport, "%d", host_port); | |
1724 | if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) { | |
1725 | error("%.100s: unknown host (%s)", host, gai_strerror(gaierr)); | |
7368a6c8 | 1726 | return -1; |
48e671d5 | 1727 | } |
48e671d5 | 1728 | for (ai = aitop; ai; ai = ai->ai_next) { |
1729 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
1730 | continue; | |
1731 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), | |
1732 | strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { | |
7368a6c8 | 1733 | error("channel_connect_to: getnameinfo failed"); |
48e671d5 | 1734 | continue; |
5260325f | 1735 | } |
48e671d5 | 1736 | /* Create the socket. */ |
1737 | sock = socket(ai->ai_family, SOCK_STREAM, 0); | |
1738 | if (sock < 0) { | |
1739 | error("socket: %.100s", strerror(errno)); | |
1740 | continue; | |
5260325f | 1741 | } |
97fb6912 | 1742 | if (fcntl(sock, F_SETFL, O_NDELAY) < 0) |
1743 | fatal("connect_to: F_SETFL: %s", strerror(errno)); | |
48e671d5 | 1744 | /* Connect to the host/port. */ |
97fb6912 | 1745 | if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0 && |
1746 | errno != EINPROGRESS) { | |
48e671d5 | 1747 | error("connect %.100s port %s: %.100s", ntop, strport, |
1748 | strerror(errno)); | |
1749 | close(sock); | |
1750 | continue; /* fail -- try next */ | |
1751 | } | |
1752 | break; /* success */ | |
5260325f | 1753 | |
5260325f | 1754 | } |
48e671d5 | 1755 | freeaddrinfo(aitop); |
48e671d5 | 1756 | if (!ai) { |
1757 | error("connect %.100s port %d: failed.", host, host_port); | |
7368a6c8 | 1758 | return -1; |
8efc0c15 | 1759 | } |
7368a6c8 | 1760 | /* success */ |
1761 | return sock; | |
1762 | } | |
fa08c86b | 1763 | int |
1764 | channel_connect_by_listen_adress(u_short listen_port) | |
1765 | { | |
1766 | int i; | |
1767 | for (i = 0; i < num_permitted_opens; i++) | |
1768 | if (permitted_opens[i].listen_port == listen_port) | |
1769 | return channel_connect_to( | |
1770 | permitted_opens[i].host_to_connect, | |
1771 | permitted_opens[i].port_to_connect); | |
0b6fbf03 | 1772 | error("WARNING: Server requests forwarding for unknown listen_port %d", |
1773 | listen_port); | |
fa08c86b | 1774 | return -1; |
1775 | } | |
48e671d5 | 1776 | |
7368a6c8 | 1777 | /* |
1778 | * This is called after receiving PORT_OPEN message. This attempts to | |
1779 | * connect to the given host:port, and sends back CHANNEL_OPEN_CONFIRMATION | |
1780 | * or CHANNEL_OPEN_FAILURE. | |
1781 | */ | |
5260325f | 1782 | |
6ae2364d | 1783 | void |
188adeb2 | 1784 | channel_input_port_open(int type, int plen, void *ctxt) |
7368a6c8 | 1785 | { |
1786 | u_short host_port; | |
1787 | char *host, *originator_string; | |
1788 | int remote_channel, sock = -1, newch, i, denied; | |
1789 | unsigned int host_len, originator_len; | |
5260325f | 1790 | |
7368a6c8 | 1791 | /* Get remote channel number. */ |
1792 | remote_channel = packet_get_int(); | |
5260325f | 1793 | |
7368a6c8 | 1794 | /* Get host name to connect to. */ |
1795 | host = packet_get_string(&host_len); | |
5260325f | 1796 | |
7368a6c8 | 1797 | /* Get port to connect to. */ |
1798 | host_port = packet_get_int(); | |
5260325f | 1799 | |
7368a6c8 | 1800 | /* Get remote originator name. */ |
1801 | if (have_hostname_in_open) { | |
1802 | originator_string = packet_get_string(&originator_len); | |
1803 | originator_len += 4; /* size of packet_int */ | |
1804 | } else { | |
1805 | originator_string = xstrdup("unknown (remote did not supply name)"); | |
1806 | originator_len = 0; /* no originator supplied */ | |
1807 | } | |
5260325f | 1808 | |
7368a6c8 | 1809 | packet_integrity_check(plen, |
1810 | 4 + 4 + host_len + 4 + originator_len, SSH_MSG_PORT_OPEN); | |
1811 | ||
1812 | /* Check if opening that port is permitted. */ | |
1813 | denied = 0; | |
1814 | if (!all_opens_permitted) { | |
1815 | /* Go trough all permitted ports. */ | |
1816 | for (i = 0; i < num_permitted_opens; i++) | |
1817 | if (permitted_opens[i].port_to_connect == host_port && | |
1818 | strcmp(permitted_opens[i].host_to_connect, host) == 0) | |
1819 | break; | |
1820 | ||
1821 | /* Check if we found the requested port among those permitted. */ | |
1822 | if (i >= num_permitted_opens) { | |
1823 | /* The port is not permitted. */ | |
1824 | log("Received request to connect to %.100s:%d, but the request was denied.", | |
1825 | host, host_port); | |
1826 | denied = 1; | |
1827 | } | |
1828 | } | |
1829 | sock = denied ? -1 : channel_connect_to(host, host_port); | |
1830 | if (sock > 0) { | |
1831 | /* Allocate a channel for this connection. */ | |
97fb6912 | 1832 | newch = channel_allocate(SSH_CHANNEL_CONNECTING, |
1833 | sock, originator_string); | |
1834 | /*XXX delay answer? */ | |
7368a6c8 | 1835 | channels[newch].remote_id = remote_channel; |
1836 | ||
1837 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
1838 | packet_put_int(remote_channel); | |
1839 | packet_put_int(newch); | |
1840 | packet_send(); | |
1841 | } else { | |
1842 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
1843 | packet_put_int(remote_channel); | |
1844 | packet_send(); | |
1845 | } | |
1846 | xfree(host); | |
8efc0c15 | 1847 | } |
1848 | ||
aa3378df | 1849 | /* |
1850 | * Creates an internet domain socket for listening for X11 connections. | |
1851 | * Returns a suitable value for the DISPLAY variable, or NULL if an error | |
1852 | * occurs. | |
1853 | */ | |
8efc0c15 | 1854 | |
48e671d5 | 1855 | #define NUM_SOCKS 10 |
1856 | ||
5260325f | 1857 | char * |
95f1eccc | 1858 | x11_create_display_inet(int screen_number, int x11_display_offset) |
8efc0c15 | 1859 | { |
57112b5a | 1860 | int display_number, sock; |
1861 | u_short port; | |
48e671d5 | 1862 | struct addrinfo hints, *ai, *aitop; |
1863 | char strport[NI_MAXSERV]; | |
1864 | int gaierr, n, num_socks = 0, socks[NUM_SOCKS]; | |
1865 | char display[512]; | |
5260325f | 1866 | char hostname[MAXHOSTNAMELEN]; |
1867 | ||
95f1eccc | 1868 | for (display_number = x11_display_offset; |
5260325f | 1869 | display_number < MAX_DISPLAYS; |
1870 | display_number++) { | |
1871 | port = 6000 + display_number; | |
48e671d5 | 1872 | memset(&hints, 0, sizeof(hints)); |
1873 | hints.ai_family = IPv4or6; | |
1874 | hints.ai_flags = AI_PASSIVE; /* XXX loopback only ? */ | |
1875 | hints.ai_socktype = SOCK_STREAM; | |
1876 | snprintf(strport, sizeof strport, "%d", port); | |
1877 | if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) { | |
1878 | error("getaddrinfo: %.100s", gai_strerror(gaierr)); | |
5260325f | 1879 | return NULL; |
1880 | } | |
48e671d5 | 1881 | for (ai = aitop; ai; ai = ai->ai_next) { |
1882 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) | |
1883 | continue; | |
1884 | sock = socket(ai->ai_family, SOCK_STREAM, 0); | |
1885 | if (sock < 0) { | |
4ee81249 | 1886 | if ((errno != EINVAL) && (errno != EAFNOSUPPORT)) { |
80a44451 | 1887 | error("socket: %.100s", strerror(errno)); |
1888 | return NULL; | |
1889 | } else { | |
22d89d24 | 1890 | debug("x11_create_display_inet: Socket family %d not supported", |
1891 | ai->ai_family); | |
80a44451 | 1892 | continue; |
1893 | } | |
48e671d5 | 1894 | } |
1895 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { | |
1896 | debug("bind port %d: %.100s", port, strerror(errno)); | |
1897 | shutdown(sock, SHUT_RDWR); | |
1898 | close(sock); | |
16218745 | 1899 | |
1900 | if (ai->ai_next) | |
1901 | continue; | |
1902 | ||
48e671d5 | 1903 | for (n = 0; n < num_socks; n++) { |
1904 | shutdown(socks[n], SHUT_RDWR); | |
1905 | close(socks[n]); | |
1906 | } | |
1907 | num_socks = 0; | |
1908 | break; | |
1909 | } | |
1910 | socks[num_socks++] = sock; | |
80faa19f | 1911 | #ifndef DONT_TRY_OTHER_AF |
48e671d5 | 1912 | if (num_socks == NUM_SOCKS) |
1913 | break; | |
80faa19f | 1914 | #else |
1915 | break; | |
1916 | #endif | |
5260325f | 1917 | } |
48e671d5 | 1918 | if (num_socks > 0) |
1919 | break; | |
5260325f | 1920 | } |
1921 | if (display_number >= MAX_DISPLAYS) { | |
1922 | error("Failed to allocate internet-domain X11 display socket."); | |
1923 | return NULL; | |
8efc0c15 | 1924 | } |
5260325f | 1925 | /* Start listening for connections on the socket. */ |
48e671d5 | 1926 | for (n = 0; n < num_socks; n++) { |
1927 | sock = socks[n]; | |
1928 | if (listen(sock, 5) < 0) { | |
1929 | error("listen: %.100s", strerror(errno)); | |
1930 | shutdown(sock, SHUT_RDWR); | |
1931 | close(sock); | |
1932 | return NULL; | |
1933 | } | |
8efc0c15 | 1934 | } |
48e671d5 | 1935 | |
5260325f | 1936 | /* Set up a suitable value for the DISPLAY variable. */ |
a7effaac | 1937 | |
5260325f | 1938 | if (gethostname(hostname, sizeof(hostname)) < 0) |
1939 | fatal("gethostname: %.100s", strerror(errno)); | |
a7effaac | 1940 | |
1941 | #ifdef IPADDR_IN_DISPLAY | |
1942 | /* | |
1943 | * HPUX detects the local hostname in the DISPLAY variable and tries | |
1944 | * to set up a shared memory connection to the server, which it | |
1945 | * incorrectly supposes to be local. | |
1946 | * | |
1947 | * The workaround - as used in later $$H and other programs - is | |
1948 | * is to set display to the host's IP address. | |
1949 | */ | |
1950 | { | |
1951 | struct hostent *he; | |
1952 | struct in_addr my_addr; | |
1953 | ||
1954 | he = gethostbyname(hostname); | |
1955 | if (he == NULL) { | |
1956 | error("[X11-broken-fwd-hostname-workaround] Could not get " | |
1957 | "IP address for hostname %s.", hostname); | |
1958 | ||
1959 | packet_send_debug("[X11-broken-fwd-hostname-workaround]" | |
1960 | "Could not get IP address for hostname %s.", hostname); | |
1961 | ||
1962 | shutdown(sock, SHUT_RDWR); | |
1963 | close(sock); | |
1964 | ||
1965 | return NULL; | |
1966 | } | |
1967 | ||
1968 | memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr)); | |
1969 | ||
1970 | /* Set DISPLAY to <ip address>:screen.display */ | |
48e671d5 | 1971 | snprintf(display, sizeof(display), "%.50s:%d.%d", inet_ntoa(my_addr), |
a7effaac | 1972 | display_number, screen_number); |
1973 | } | |
1974 | #else /* IPADDR_IN_DISPLAY */ | |
1975 | /* Just set DISPLAY to hostname:screen.display */ | |
48e671d5 | 1976 | snprintf(display, sizeof display, "%.400s:%d.%d", hostname, |
a7effaac | 1977 | display_number, screen_number); |
1978 | #endif /* IPADDR_IN_DISPLAY */ | |
5260325f | 1979 | |
48e671d5 | 1980 | /* Allocate a channel for each socket. */ |
1981 | for (n = 0; n < num_socks; n++) { | |
1982 | sock = socks[n]; | |
0b242b12 | 1983 | (void) channel_new("x11 listener", |
1984 | SSH_CHANNEL_X11_LISTENER, sock, sock, -1, | |
1985 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, | |
a22aff1f | 1986 | 0, xstrdup("X11 inet listener"), 1); |
48e671d5 | 1987 | } |
5260325f | 1988 | |
1989 | /* Return a suitable value for the DISPLAY environment variable. */ | |
48e671d5 | 1990 | return xstrdup(display); |
8efc0c15 | 1991 | } |
1992 | ||
1993 | #ifndef X_UNIX_PATH | |
1994 | #define X_UNIX_PATH "/tmp/.X11-unix/X" | |
1995 | #endif | |
1996 | ||
1997 | static | |
1998 | int | |
2f450969 | 1999 | connect_local_xsocket(unsigned int dnr) |
8efc0c15 | 2000 | { |
5260325f | 2001 | static const char *const x_sockets[] = { |
2002 | X_UNIX_PATH "%u", | |
2003 | "/var/X/.X11-unix/X" "%u", | |
2004 | "/usr/spool/sockets/X11/" "%u", | |
2005 | NULL | |
2006 | }; | |
2007 | int sock; | |
2008 | struct sockaddr_un addr; | |
2009 | const char *const * path; | |
2010 | ||
2011 | for (path = x_sockets; *path; ++path) { | |
2012 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
2013 | if (sock < 0) | |
2014 | error("socket: %.100s", strerror(errno)); | |
2015 | memset(&addr, 0, sizeof(addr)); | |
2016 | addr.sun_family = AF_UNIX; | |
2017 | snprintf(addr.sun_path, sizeof addr.sun_path, *path, dnr); | |
2018 | if (connect(sock, (struct sockaddr *) & addr, sizeof(addr)) == 0) | |
2019 | return sock; | |
2020 | close(sock); | |
2021 | } | |
2022 | error("connect %.100s: %.100s", addr.sun_path, strerror(errno)); | |
2023 | return -1; | |
8efc0c15 | 2024 | } |
2025 | ||
0b242b12 | 2026 | int |
2027 | x11_connect_display(void) | |
8efc0c15 | 2028 | { |
0b242b12 | 2029 | int display_number, sock = 0; |
5260325f | 2030 | const char *display; |
0b242b12 | 2031 | char buf[1024], *cp; |
48e671d5 | 2032 | struct addrinfo hints, *ai, *aitop; |
2033 | char strport[NI_MAXSERV]; | |
2034 | int gaierr; | |
5260325f | 2035 | |
5260325f | 2036 | /* Try to open a socket for the local X server. */ |
2037 | display = getenv("DISPLAY"); | |
2038 | if (!display) { | |
2039 | error("DISPLAY not set."); | |
0b242b12 | 2040 | return -1; |
5260325f | 2041 | } |
aa3378df | 2042 | /* |
2043 | * Now we decode the value of the DISPLAY variable and make a | |
2044 | * connection to the real X server. | |
2045 | */ | |
2046 | ||
2047 | /* | |
2048 | * Check if it is a unix domain socket. Unix domain displays are in | |
2049 | * one of the following formats: unix:d[.s], :d[.s], ::d[.s] | |
2050 | */ | |
5260325f | 2051 | if (strncmp(display, "unix:", 5) == 0 || |
2052 | display[0] == ':') { | |
2053 | /* Connect to the unix domain socket. */ | |
2054 | if (sscanf(strrchr(display, ':') + 1, "%d", &display_number) != 1) { | |
2055 | error("Could not parse display number from DISPLAY: %.100s", | |
2056 | display); | |
0b242b12 | 2057 | return -1; |
5260325f | 2058 | } |
2059 | /* Create a socket. */ | |
2060 | sock = connect_local_xsocket(display_number); | |
2061 | if (sock < 0) | |
0b242b12 | 2062 | return -1; |
5260325f | 2063 | |
2064 | /* OK, we now have a connection to the display. */ | |
0b242b12 | 2065 | return sock; |
5260325f | 2066 | } |
aa3378df | 2067 | /* |
2068 | * Connect to an inet socket. The DISPLAY value is supposedly | |
2069 | * hostname:d[.s], where hostname may also be numeric IP address. | |
2070 | */ | |
5260325f | 2071 | strncpy(buf, display, sizeof(buf)); |
2072 | buf[sizeof(buf) - 1] = 0; | |
2073 | cp = strchr(buf, ':'); | |
2074 | if (!cp) { | |
2075 | error("Could not find ':' in DISPLAY: %.100s", display); | |
0b242b12 | 2076 | return -1; |
5260325f | 2077 | } |
2078 | *cp = 0; | |
aa3378df | 2079 | /* buf now contains the host name. But first we parse the display number. */ |
5260325f | 2080 | if (sscanf(cp + 1, "%d", &display_number) != 1) { |
2081 | error("Could not parse display number from DISPLAY: %.100s", | |
2082 | display); | |
0b242b12 | 2083 | return -1; |
5260325f | 2084 | } |
5260325f | 2085 | |
48e671d5 | 2086 | /* Look up the host address */ |
2087 | memset(&hints, 0, sizeof(hints)); | |
2088 | hints.ai_family = IPv4or6; | |
2089 | hints.ai_socktype = SOCK_STREAM; | |
2090 | snprintf(strport, sizeof strport, "%d", 6000 + display_number); | |
2091 | if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) { | |
2092 | error("%.100s: unknown host. (%s)", buf, gai_strerror(gaierr)); | |
0b242b12 | 2093 | return -1; |
8efc0c15 | 2094 | } |
48e671d5 | 2095 | for (ai = aitop; ai; ai = ai->ai_next) { |
2096 | /* Create a socket. */ | |
2097 | sock = socket(ai->ai_family, SOCK_STREAM, 0); | |
2098 | if (sock < 0) { | |
2099 | debug("socket: %.100s", strerror(errno)); | |
7368a6c8 | 2100 | continue; |
2101 | } | |
2102 | /* Connect it to the display. */ | |
2103 | if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) { | |
2104 | debug("connect %.100s port %d: %.100s", buf, | |
2105 | 6000 + display_number, strerror(errno)); | |
2106 | close(sock); | |
2107 | continue; | |
2108 | } | |
2109 | /* Success */ | |
2110 | break; | |
48e671d5 | 2111 | } |
48e671d5 | 2112 | freeaddrinfo(aitop); |
2113 | if (!ai) { | |
6ae2364d | 2114 | error("connect %.100s port %d: %.100s", buf, 6000 + display_number, |
48e671d5 | 2115 | strerror(errno)); |
0b242b12 | 2116 | return -1; |
8efc0c15 | 2117 | } |
0b242b12 | 2118 | return sock; |
2119 | } | |
5260325f | 2120 | |
0b242b12 | 2121 | /* |
2122 | * This is called when SSH_SMSG_X11_OPEN is received. The packet contains | |
2123 | * the remote channel number. We should do whatever we want, and respond | |
2124 | * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE. | |
2125 | */ | |
5260325f | 2126 | |
0b242b12 | 2127 | void |
188adeb2 | 2128 | x11_input_open(int type, int plen, void *ctxt) |
0b242b12 | 2129 | { |
2130 | int remote_channel, sock = 0, newch; | |
2131 | char *remote_host; | |
2132 | unsigned int remote_len; | |
5260325f | 2133 | |
0b242b12 | 2134 | /* Get remote channel number. */ |
2135 | remote_channel = packet_get_int(); | |
5260325f | 2136 | |
0b242b12 | 2137 | /* Get remote originator name. */ |
2138 | if (have_hostname_in_open) { | |
2139 | remote_host = packet_get_string(&remote_len); | |
2140 | remote_len += 4; | |
2141 | } else { | |
2142 | remote_host = xstrdup("unknown (remote did not supply name)"); | |
2143 | remote_len = 0; | |
2144 | } | |
2145 | ||
2146 | debug("Received X11 open request."); | |
2147 | packet_integrity_check(plen, 4 + remote_len, SSH_SMSG_X11_OPEN); | |
2148 | ||
2149 | /* Obtain a connection to the real X display. */ | |
2150 | sock = x11_connect_display(); | |
2151 | if (sock == -1) { | |
2152 | /* Send refusal to the remote host. */ | |
2153 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
2154 | packet_put_int(remote_channel); | |
2155 | packet_send(); | |
2156 | } else { | |
2157 | /* Allocate a channel for this connection. */ | |
2158 | newch = channel_allocate( | |
2159 | (x11_saved_proto == NULL) ? | |
2160 | SSH_CHANNEL_OPEN : SSH_CHANNEL_X11_OPEN, | |
2161 | sock, remote_host); | |
2162 | channels[newch].remote_id = remote_channel; | |
2163 | ||
2164 | /* Send a confirmation to the remote host. */ | |
2165 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
2166 | packet_put_int(remote_channel); | |
2167 | packet_put_int(newch); | |
2168 | packet_send(); | |
2169 | } | |
8efc0c15 | 2170 | } |
2171 | ||
a22aff1f | 2172 | /* dummy protocol handler that denies SSH-1 requests (agent/x11) */ |
2173 | void | |
2174 | deny_input_open(int type, int plen, void *ctxt) | |
2175 | { | |
2176 | int rchan = packet_get_int(); | |
2177 | switch(type){ | |
2178 | case SSH_SMSG_AGENT_OPEN: | |
2179 | error("Warning: ssh server tried agent forwarding."); | |
2180 | break; | |
2181 | case SSH_SMSG_X11_OPEN: | |
2182 | error("Warning: ssh server tried X11 forwarding."); | |
2183 | break; | |
2184 | default: | |
2185 | error("deny_input_open: type %d plen %d", type, plen); | |
2186 | break; | |
2187 | } | |
2188 | error("Warning: this is probably a break in attempt by a malicious server."); | |
2189 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
2190 | packet_put_int(rchan); | |
2191 | packet_send(); | |
2192 | } | |
2193 | ||
aa3378df | 2194 | /* |
2195 | * Requests forwarding of X11 connections, generates fake authentication | |
2196 | * data, and enables authentication spoofing. | |
2197 | */ | |
8efc0c15 | 2198 | |
6ae2364d | 2199 | void |
0b242b12 | 2200 | x11_request_forwarding_with_spoofing(int client_session_id, |
2201 | const char *proto, const char *data) | |
8efc0c15 | 2202 | { |
5260325f | 2203 | unsigned int data_len = (unsigned int) strlen(data) / 2; |
2204 | unsigned int i, value; | |
2205 | char *new_data; | |
2206 | int screen_number; | |
2207 | const char *cp; | |
2208 | u_int32_t rand = 0; | |
2209 | ||
2210 | cp = getenv("DISPLAY"); | |
2211 | if (cp) | |
2212 | cp = strchr(cp, ':'); | |
2213 | if (cp) | |
2214 | cp = strchr(cp, '.'); | |
2215 | if (cp) | |
2216 | screen_number = atoi(cp + 1); | |
2217 | else | |
2218 | screen_number = 0; | |
2219 | ||
2220 | /* Save protocol name. */ | |
2221 | x11_saved_proto = xstrdup(proto); | |
2222 | ||
aa3378df | 2223 | /* |
2224 | * Extract real authentication data and generate fake data of the | |
2225 | * same length. | |
2226 | */ | |
5260325f | 2227 | x11_saved_data = xmalloc(data_len); |
2228 | x11_fake_data = xmalloc(data_len); | |
2229 | for (i = 0; i < data_len; i++) { | |
2230 | if (sscanf(data + 2 * i, "%2x", &value) != 1) | |
2231 | fatal("x11_request_forwarding: bad authentication data: %.100s", data); | |
2232 | if (i % 4 == 0) | |
2233 | rand = arc4random(); | |
2234 | x11_saved_data[i] = value; | |
2235 | x11_fake_data[i] = rand & 0xff; | |
2236 | rand >>= 8; | |
2237 | } | |
2238 | x11_saved_data_len = data_len; | |
2239 | x11_fake_data_len = data_len; | |
2240 | ||
2241 | /* Convert the fake data into hex. */ | |
2242 | new_data = xmalloc(2 * data_len + 1); | |
2243 | for (i = 0; i < data_len; i++) | |
2244 | sprintf(new_data + 2 * i, "%02x", (unsigned char) x11_fake_data[i]); | |
2245 | ||
2246 | /* Send the request packet. */ | |
0b242b12 | 2247 | if (compat20) { |
2248 | channel_request_start(client_session_id, "x11-req", 0); | |
2249 | packet_put_char(0); /* XXX bool single connection */ | |
2250 | } else { | |
2251 | packet_start(SSH_CMSG_X11_REQUEST_FORWARDING); | |
2252 | } | |
2253 | packet_put_cstring(proto); | |
2254 | packet_put_cstring(new_data); | |
5260325f | 2255 | packet_put_int(screen_number); |
2256 | packet_send(); | |
2257 | packet_write_wait(); | |
2258 | xfree(new_data); | |
8efc0c15 | 2259 | } |
2260 | ||
2261 | /* Sends a message to the server to request authentication fd forwarding. */ | |
2262 | ||
6ae2364d | 2263 | void |
5260325f | 2264 | auth_request_forwarding() |
8efc0c15 | 2265 | { |
5260325f | 2266 | packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING); |
2267 | packet_send(); | |
2268 | packet_write_wait(); | |
8efc0c15 | 2269 | } |
2270 | ||
aa3378df | 2271 | /* |
2272 | * Returns the name of the forwarded authentication socket. Returns NULL if | |
2273 | * there is no forwarded authentication socket. The returned value points to | |
2274 | * a static buffer. | |
2275 | */ | |
8efc0c15 | 2276 | |
5260325f | 2277 | char * |
2278 | auth_get_socket_name() | |
8efc0c15 | 2279 | { |
5260325f | 2280 | return channel_forwarded_auth_socket_name; |
8efc0c15 | 2281 | } |
2282 | ||
2283 | /* removes the agent forwarding socket */ | |
2284 | ||
6ae2364d | 2285 | void |
5260325f | 2286 | cleanup_socket(void) |
2287 | { | |
77bb0bca | 2288 | unlink(channel_forwarded_auth_socket_name); |
5260325f | 2289 | rmdir(channel_forwarded_auth_socket_dir); |
8efc0c15 | 2290 | } |
2291 | ||
aa3378df | 2292 | /* |
fa649821 | 2293 | * This is called to process SSH_CMSG_AGENT_REQUEST_FORWARDING on the server. |
aa3378df | 2294 | * This starts forwarding authentication requests. |
2295 | */ | |
8efc0c15 | 2296 | |
fa649821 | 2297 | int |
5260325f | 2298 | auth_input_request_forwarding(struct passwd * pw) |
8efc0c15 | 2299 | { |
5260325f | 2300 | int sock, newch; |
2301 | struct sockaddr_un sunaddr; | |
2302 | ||
2303 | if (auth_get_socket_name() != NULL) | |
2304 | fatal("Protocol error: authentication forwarding requested twice."); | |
2305 | ||
2306 | /* Temporarily drop privileged uid for mkdir/bind. */ | |
2307 | temporarily_use_uid(pw->pw_uid); | |
2308 | ||
2309 | /* Allocate a buffer for the socket name, and format the name. */ | |
2310 | channel_forwarded_auth_socket_name = xmalloc(MAX_SOCKET_NAME); | |
2311 | channel_forwarded_auth_socket_dir = xmalloc(MAX_SOCKET_NAME); | |
2312 | strlcpy(channel_forwarded_auth_socket_dir, "/tmp/ssh-XXXXXXXX", MAX_SOCKET_NAME); | |
2313 | ||
2314 | /* Create private directory for socket */ | |
fa649821 | 2315 | if (mkdtemp(channel_forwarded_auth_socket_dir) == NULL) { |
2316 | packet_send_debug("Agent forwarding disabled: mkdtemp() failed: %.100s", | |
2317 | strerror(errno)); | |
2318 | restore_uid(); | |
2319 | xfree(channel_forwarded_auth_socket_name); | |
2320 | xfree(channel_forwarded_auth_socket_dir); | |
2321 | channel_forwarded_auth_socket_name = NULL; | |
2322 | channel_forwarded_auth_socket_dir = NULL; | |
2323 | return 0; | |
2324 | } | |
5260325f | 2325 | snprintf(channel_forwarded_auth_socket_name, MAX_SOCKET_NAME, "%s/agent.%d", |
2326 | channel_forwarded_auth_socket_dir, (int) getpid()); | |
2327 | ||
2328 | if (atexit(cleanup_socket) < 0) { | |
2329 | int saved = errno; | |
2330 | cleanup_socket(); | |
2331 | packet_disconnect("socket: %.100s", strerror(saved)); | |
2332 | } | |
2333 | /* Create the socket. */ | |
2334 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
2335 | if (sock < 0) | |
2336 | packet_disconnect("socket: %.100s", strerror(errno)); | |
2337 | ||
2338 | /* Bind it to the name. */ | |
2339 | memset(&sunaddr, 0, sizeof(sunaddr)); | |
2340 | sunaddr.sun_family = AF_UNIX; | |
2341 | strncpy(sunaddr.sun_path, channel_forwarded_auth_socket_name, | |
2342 | sizeof(sunaddr.sun_path)); | |
2343 | ||
2344 | if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0) | |
2345 | packet_disconnect("bind: %.100s", strerror(errno)); | |
2346 | ||
2347 | /* Restore the privileged uid. */ | |
2348 | restore_uid(); | |
2349 | ||
2350 | /* Start listening on the socket. */ | |
2351 | if (listen(sock, 5) < 0) | |
2352 | packet_disconnect("listen: %.100s", strerror(errno)); | |
2353 | ||
2354 | /* Allocate a channel for the authentication agent socket. */ | |
fa08c86b | 2355 | newch = channel_new("auth socket", |
2356 | SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1, | |
2357 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, | |
2358 | 0, xstrdup("auth socket"), 1); | |
2359 | ||
a408af76 | 2360 | strlcpy(channels[newch].path, channel_forwarded_auth_socket_name, |
2361 | sizeof(channels[newch].path)); | |
fa649821 | 2362 | return 1; |
8efc0c15 | 2363 | } |
2364 | ||
2365 | /* This is called to process an SSH_SMSG_AGENT_OPEN message. */ | |
2366 | ||
6ae2364d | 2367 | void |
188adeb2 | 2368 | auth_input_open_request(int type, int plen, void *ctxt) |
8efc0c15 | 2369 | { |
5260325f | 2370 | int remch, sock, newch; |
2371 | char *dummyname; | |
2372 | ||
7368a6c8 | 2373 | packet_integrity_check(plen, 4, type); |
2374 | ||
5260325f | 2375 | /* Read the remote channel number from the message. */ |
2376 | remch = packet_get_int(); | |
2377 | ||
aa3378df | 2378 | /* |
2379 | * Get a connection to the local authentication agent (this may again | |
2380 | * get forwarded). | |
2381 | */ | |
5260325f | 2382 | sock = ssh_get_authentication_socket(); |
2383 | ||
aa3378df | 2384 | /* |
2385 | * If we could not connect the agent, send an error message back to | |
2386 | * the server. This should never happen unless the agent dies, | |
2387 | * because authentication forwarding is only enabled if we have an | |
2388 | * agent. | |
2389 | */ | |
5260325f | 2390 | if (sock < 0) { |
2391 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); | |
2392 | packet_put_int(remch); | |
2393 | packet_send(); | |
2394 | return; | |
2395 | } | |
2396 | debug("Forwarding authentication connection."); | |
2397 | ||
aa3378df | 2398 | /* |
2399 | * Dummy host name. This will be freed when the channel is freed; it | |
2400 | * will still be valid in the packet_put_string below since the | |
2401 | * channel cannot yet be freed at that point. | |
2402 | */ | |
5260325f | 2403 | dummyname = xstrdup("authentication agent connection"); |
2404 | ||
2405 | newch = channel_allocate(SSH_CHANNEL_OPEN, sock, dummyname); | |
2406 | channels[newch].remote_id = remch; | |
2407 | ||
2408 | /* Send a confirmation to the remote host. */ | |
2409 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); | |
2410 | packet_put_int(remch); | |
2411 | packet_put_int(newch); | |
2412 | packet_send(); | |
8efc0c15 | 2413 | } |
7e7327a1 | 2414 | |
2415 | void | |
0b242b12 | 2416 | channel_start_open(int id) |
7e7327a1 | 2417 | { |
2418 | Channel *c = channel_lookup(id); | |
2419 | if (c == NULL) { | |
2420 | log("channel_open: %d: bad id", id); | |
2421 | return; | |
2422 | } | |
0b242b12 | 2423 | debug("send channel open %d", id); |
7e7327a1 | 2424 | packet_start(SSH2_MSG_CHANNEL_OPEN); |
2425 | packet_put_cstring(c->ctype); | |
2426 | packet_put_int(c->self); | |
2427 | packet_put_int(c->local_window); | |
2428 | packet_put_int(c->local_maxpacket); | |
0b242b12 | 2429 | } |
2430 | void | |
2431 | channel_open(int id) | |
2432 | { | |
2433 | /* XXX REMOVE ME */ | |
2434 | channel_start_open(id); | |
7e7327a1 | 2435 | packet_send(); |
7e7327a1 | 2436 | } |
2437 | void | |
2438 | channel_request(int id, char *service, int wantconfirm) | |
2439 | { | |
2440 | channel_request_start(id, service, wantconfirm); | |
2441 | packet_send(); | |
2442 | debug("channel request %d: %s", id, service) ; | |
2443 | } | |
2444 | void | |
2445 | channel_request_start(int id, char *service, int wantconfirm) | |
2446 | { | |
2447 | Channel *c = channel_lookup(id); | |
2448 | if (c == NULL) { | |
2449 | log("channel_request: %d: bad id", id); | |
2450 | return; | |
2451 | } | |
2452 | packet_start(SSH2_MSG_CHANNEL_REQUEST); | |
2453 | packet_put_int(c->remote_id); | |
2454 | packet_put_cstring(service); | |
2455 | packet_put_char(wantconfirm); | |
2456 | } | |
2457 | void | |
2458 | channel_register_callback(int id, int mtype, channel_callback_fn *fn, void *arg) | |
2459 | { | |
2460 | Channel *c = channel_lookup(id); | |
2461 | if (c == NULL) { | |
2462 | log("channel_register_callback: %d: bad id", id); | |
2463 | return; | |
2464 | } | |
2465 | c->cb_event = mtype; | |
2466 | c->cb_fn = fn; | |
2467 | c->cb_arg = arg; | |
2468 | } | |
2469 | void | |
2470 | channel_register_cleanup(int id, channel_callback_fn *fn) | |
2471 | { | |
2472 | Channel *c = channel_lookup(id); | |
2473 | if (c == NULL) { | |
2474 | log("channel_register_cleanup: %d: bad id", id); | |
2475 | return; | |
2476 | } | |
2477 | c->dettach_user = fn; | |
2478 | } | |
2479 | void | |
2480 | channel_cancel_cleanup(int id) | |
2481 | { | |
2482 | Channel *c = channel_lookup(id); | |
2483 | if (c == NULL) { | |
2484 | log("channel_cancel_cleanup: %d: bad id", id); | |
2485 | return; | |
2486 | } | |
2487 | c->dettach_user = NULL; | |
2488 | } | |
2e73a022 | 2489 | void |
2490 | channel_register_filter(int id, channel_filter_fn *fn) | |
2491 | { | |
2492 | Channel *c = channel_lookup(id); | |
2493 | if (c == NULL) { | |
2494 | log("channel_register_filter: %d: bad id", id); | |
2495 | return; | |
2496 | } | |
2497 | c->input_filter = fn; | |
2498 | } | |
7e7327a1 | 2499 | |
2500 | void | |
a22aff1f | 2501 | channel_set_fds(int id, int rfd, int wfd, int efd, |
2502 | int extusage, int nonblock) | |
7e7327a1 | 2503 | { |
2504 | Channel *c = channel_lookup(id); | |
2505 | if (c == NULL || c->type != SSH_CHANNEL_LARVAL) | |
2506 | fatal("channel_activate for non-larval channel %d.", id); | |
a22aff1f | 2507 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock); |
7e7327a1 | 2508 | c->type = SSH_CHANNEL_OPEN; |
7e7327a1 | 2509 | /* XXX window size? */ |
bcbf86ec | 2510 | c->local_window = c->local_window_max = c->local_maxpacket * 2; |
7e7327a1 | 2511 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
2512 | packet_put_int(c->remote_id); | |
2513 | packet_put_int(c->local_window); | |
2514 | packet_send(); | |
2515 | } |