blob: 96d8dc4b401e80580ed32112132faf816bfb45d0 [file] [log] [blame]
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001/*
Damien Miller95def091999-11-25 00:26:21 +11002 * Author: Tatu Ylonen <ylo@cs.hut.fi>
Damien Miller95def091999-11-25 00:26:21 +11003 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4 * All rights reserved
Damien Miller95def091999-11-25 00:26:21 +11005 * 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.
Damien Miller4af51302000-04-16 11:18:38 +10008 *
Damien Millere4340be2000-09-16 13:29:08 +11009 * 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 *
Damien Miller33b13562000-04-04 14:38:59 +100016 * SSH2 support added by Markus Friedl.
Damien Millere4340be2000-09-16 13:29:08 +110017 * 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.
Damien Miller95def091999-11-25 00:26:21 +110040 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100041
42#include "includes.h"
Damien Millerd3444942000-09-30 14:20:03 +110043RCSID("$OpenBSD: channels.c,v 1.70 2000/09/28 18:03:18 markus Exp $");
Damien Millerd4a8b7e1999-10-27 13:42:43 +100044
45#include "ssh.h"
46#include "packet.h"
47#include "xmalloc.h"
48#include "buffer.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100049#include "uidswap.h"
Damien Miller6d7b2cd1999-11-12 15:19:27 +110050#include "readconf.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100051#include "servconf.h"
52
53#include "channels.h"
54#include "nchan.h"
55#include "compat.h"
56
Damien Miller33b13562000-04-04 14:38:59 +100057#include "ssh2.h"
58
Damien Miller994cf142000-07-21 10:19:44 +100059#include <openssl/rsa.h>
60#include <openssl/dsa.h>
61#include "key.h"
62#include "authfd.h"
63
Damien Millerd4a8b7e1999-10-27 13:42:43 +100064/* 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
Damien Miller5428f641999-11-25 11:54:57 +110070/*
71 * Pointer to an array containing all allocated channels. The array is
72 * dynamically extended as needed.
73 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100074static Channel *channels = NULL;
75
Damien Miller5428f641999-11-25 11:54:57 +110076/*
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 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100081static int channels_alloc = 0;
82
Damien Miller5428f641999-11-25 11:54:57 +110083/*
84 * Maximum file descriptor value used in any of the channels. This is
85 * updated in channel_allocate.
86 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100087static int channel_max_fd_value = 0;
88
89/* Name and directory of socket for authentication agent forwarding. */
90static char *channel_forwarded_auth_socket_name = NULL;
Damien Miller95def091999-11-25 00:26:21 +110091static char *channel_forwarded_auth_socket_dir = NULL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100092
93/* Saved X11 authentication protocol name. */
94char *x11_saved_proto = NULL;
95
96/* Saved X11 authentication data. This is the real data. */
97char *x11_saved_data = NULL;
98unsigned int x11_saved_data_len = 0;
99
Damien Miller5428f641999-11-25 11:54:57 +1100100/*
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 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000104char *x11_fake_data = NULL;
105unsigned int x11_fake_data_len;
106
Damien Miller5428f641999-11-25 11:54:57 +1100107/*
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 */
Damien Miller95def091999-11-25 00:26:21 +1100113typedef struct {
Damien Millerb38eff82000-04-01 11:09:21 +1000114 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. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000117} ForwardPermission;
118
119/* List of all permitted host/port pairs to connect. */
120static ForwardPermission permitted_opens[SSH_MAX_FORWARDS_PER_DIRECTION];
121/* Number of permitted host/port pairs in the array. */
122static int num_permitted_opens = 0;
Damien Miller5428f641999-11-25 11:54:57 +1100123/*
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 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000128static int all_opens_permitted = 0;
129
130/* This is set to true if both sides support SSH_PROTOFLAG_HOST_IN_FWD_OPEN. */
131static int have_hostname_in_open = 0;
132
133/* Sets specific protocol options. */
134
Damien Miller4af51302000-04-16 11:18:38 +1000135void
Damien Miller95def091999-11-25 00:26:21 +1100136channel_set_options(int hostname_in_open)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000137{
Damien Miller95def091999-11-25 00:26:21 +1100138 have_hostname_in_open = hostname_in_open;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000139}
140
Damien Miller5428f641999-11-25 11:54:57 +1100141/*
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 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000146
Damien Miller4af51302000-04-16 11:18:38 +1000147void
Damien Miller95def091999-11-25 00:26:21 +1100148channel_permit_all_opens()
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000149{
Damien Miller95def091999-11-25 00:26:21 +1100150 all_opens_permitted = 1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000151}
152
Damien Millerb38eff82000-04-01 11:09:21 +1000153/* lookup channel by id */
154
155Channel *
156channel_lookup(int id)
157{
158 Channel *c;
Damien Millerc0fd17f2000-06-26 10:22:53 +1000159 if (id < 0 || id > channels_alloc) {
Damien Millerb38eff82000-04-01 11:09:21 +1000160 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
Damien Miller5428f641999-11-25 11:54:57 +1100171/*
Damien Millere247cc42000-05-07 12:03:14 +1000172 * Register filedescriptors for a channel, used when allocating a channel or
Damien Miller6f83b8e2000-05-02 09:23:45 +1000173 * when the channel consumer/producer is ready, e.g. shell exec'd
Damien Miller5428f641999-11-25 11:54:57 +1100174 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000175
Damien Miller6f83b8e2000-05-02 09:23:45 +1000176void
177channel_register_fds(Channel *c, int rfd, int wfd, int efd, int extusage)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000178{
Damien Miller95def091999-11-25 00:26:21 +1100179 /* Update the maximum file descriptor value. */
Damien Millerb38eff82000-04-01 11:09:21 +1000180 if (rfd > channel_max_fd_value)
181 channel_max_fd_value = rfd;
182 if (wfd > channel_max_fd_value)
183 channel_max_fd_value = wfd;
184 if (efd > channel_max_fd_value)
185 channel_max_fd_value = efd;
Damien Miller5428f641999-11-25 11:54:57 +1100186 /* XXX set close-on-exec -markus */
Damien Millere247cc42000-05-07 12:03:14 +1000187
Damien Miller6f83b8e2000-05-02 09:23:45 +1000188 c->rfd = rfd;
189 c->wfd = wfd;
190 c->sock = (rfd == wfd) ? rfd : -1;
191 c->efd = efd;
192 c->extended_usage = extusage;
Damien Millere247cc42000-05-07 12:03:14 +1000193 if (rfd != -1)
194 set_nonblock(rfd);
195 if (wfd != -1)
196 set_nonblock(wfd);
197 if (efd != -1)
198 set_nonblock(efd);
Damien Miller6f83b8e2000-05-02 09:23:45 +1000199}
200
201/*
202 * Allocate a new channel object and set its type and socket. This will cause
203 * remote_name to be freed.
204 */
205
206int
207channel_new(char *ctype, int type, int rfd, int wfd, int efd,
208 int window, int maxpack, int extusage, char *remote_name)
209{
210 int i, found;
211 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000212
Damien Miller95def091999-11-25 00:26:21 +1100213 /* Do initial allocation if this is the first call. */
214 if (channels_alloc == 0) {
Damien Miller33b13562000-04-04 14:38:59 +1000215 chan_init();
Damien Miller95def091999-11-25 00:26:21 +1100216 channels_alloc = 10;
217 channels = xmalloc(channels_alloc * sizeof(Channel));
218 for (i = 0; i < channels_alloc; i++)
219 channels[i].type = SSH_CHANNEL_FREE;
Damien Miller5428f641999-11-25 11:54:57 +1100220 /*
221 * Kludge: arrange a call to channel_stop_listening if we
222 * terminate with fatal().
223 */
Damien Miller95def091999-11-25 00:26:21 +1100224 fatal_add_cleanup((void (*) (void *)) channel_stop_listening, NULL);
225 }
226 /* Try to find a free slot where to put the new channel. */
227 for (found = -1, i = 0; i < channels_alloc; i++)
228 if (channels[i].type == SSH_CHANNEL_FREE) {
229 /* Found a free slot. */
230 found = i;
231 break;
232 }
233 if (found == -1) {
Damien Miller5428f641999-11-25 11:54:57 +1100234 /* There are no free slots. Take last+1 slot and expand the array. */
Damien Miller95def091999-11-25 00:26:21 +1100235 found = channels_alloc;
236 channels_alloc += 10;
Damien Millerd3444942000-09-30 14:20:03 +1100237 debug2("channel: expanding %d", channels_alloc);
Damien Miller95def091999-11-25 00:26:21 +1100238 channels = xrealloc(channels, channels_alloc * sizeof(Channel));
239 for (i = found; i < channels_alloc; i++)
240 channels[i].type = SSH_CHANNEL_FREE;
241 }
242 /* Initialize and return new channel number. */
243 c = &channels[found];
244 buffer_init(&c->input);
245 buffer_init(&c->output);
Damien Millerb38eff82000-04-01 11:09:21 +1000246 buffer_init(&c->extended);
Damien Miller95def091999-11-25 00:26:21 +1100247 chan_init_iostates(c);
Damien Miller6f83b8e2000-05-02 09:23:45 +1000248 channel_register_fds(c, rfd, wfd, efd, extusage);
Damien Miller95def091999-11-25 00:26:21 +1100249 c->self = found;
250 c->type = type;
Damien Millerb38eff82000-04-01 11:09:21 +1000251 c->ctype = ctype;
Damien Millerbd483e72000-04-30 10:00:53 +1000252 c->local_window = window;
253 c->local_window_max = window;
254 c->local_consumed = 0;
255 c->local_maxpacket = maxpack;
Damien Miller95def091999-11-25 00:26:21 +1100256 c->remote_id = -1;
257 c->remote_name = remote_name;
Damien Millerb38eff82000-04-01 11:09:21 +1000258 c->remote_window = 0;
259 c->remote_maxpacket = 0;
260 c->cb_fn = NULL;
261 c->cb_arg = NULL;
262 c->cb_event = 0;
263 c->dettach_user = NULL;
Damien Millerad833b32000-08-23 10:46:23 +1000264 c->input_filter = NULL;
Damien Miller95def091999-11-25 00:26:21 +1100265 debug("channel %d: new [%s]", found, remote_name);
266 return found;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000267}
Damien Miller6f83b8e2000-05-02 09:23:45 +1000268/* old interface XXX */
Damien Miller4af51302000-04-16 11:18:38 +1000269int
Damien Millerb38eff82000-04-01 11:09:21 +1000270channel_allocate(int type, int sock, char *remote_name)
271{
272 return channel_new("", type, sock, sock, -1, 0, 0, 0, remote_name);
273}
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000274
Damien Miller6f83b8e2000-05-02 09:23:45 +1000275
276/* Close all channel fd/socket. */
277
278void
279channel_close_fds(Channel *c)
280{
281 if (c->sock != -1) {
282 close(c->sock);
283 c->sock = -1;
284 }
285 if (c->rfd != -1) {
286 close(c->rfd);
287 c->rfd = -1;
288 }
289 if (c->wfd != -1) {
290 close(c->wfd);
291 c->wfd = -1;
292 }
293 if (c->efd != -1) {
294 close(c->efd);
295 c->efd = -1;
296 }
297}
298
299/* Free the channel and close its fd/socket. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000300
Damien Miller4af51302000-04-16 11:18:38 +1000301void
Damien Millerb38eff82000-04-01 11:09:21 +1000302channel_free(int id)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000303{
Damien Millerb38eff82000-04-01 11:09:21 +1000304 Channel *c = channel_lookup(id);
305 if (c == NULL)
306 packet_disconnect("channel free: bad local channel %d", id);
307 debug("channel_free: channel %d: status: %s", id, channel_open_message());
Damien Miller33b13562000-04-04 14:38:59 +1000308 if (c->dettach_user != NULL) {
309 debug("channel_free: channel %d: dettaching channel user", id);
310 c->dettach_user(c->self, NULL);
311 }
Damien Miller6f83b8e2000-05-02 09:23:45 +1000312 if (c->sock != -1)
Damien Millerb38eff82000-04-01 11:09:21 +1000313 shutdown(c->sock, SHUT_RDWR);
Damien Miller6f83b8e2000-05-02 09:23:45 +1000314 channel_close_fds(c);
Damien Millerb38eff82000-04-01 11:09:21 +1000315 buffer_free(&c->input);
316 buffer_free(&c->output);
317 buffer_free(&c->extended);
318 c->type = SSH_CHANNEL_FREE;
319 if (c->remote_name) {
320 xfree(c->remote_name);
321 c->remote_name = NULL;
Damien Miller95def091999-11-25 00:26:21 +1100322 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000323}
324
Damien Miller5428f641999-11-25 11:54:57 +1100325/*
Damien Millerb38eff82000-04-01 11:09:21 +1000326 * 'channel_pre*' are called just before select() to add any bits relevant to
327 * channels in the select bitmasks.
Damien Miller5428f641999-11-25 11:54:57 +1100328 */
Damien Millerb38eff82000-04-01 11:09:21 +1000329/*
330 * 'channel_post*': perform any appropriate operations for channels which
331 * have events pending.
332 */
333typedef void chan_fn(Channel *c, fd_set * readset, fd_set * writeset);
334chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE];
335chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE];
336
337void
338channel_pre_listener(Channel *c, fd_set * readset, fd_set * writeset)
339{
340 FD_SET(c->sock, readset);
341}
342
343void
344channel_pre_open_13(Channel *c, fd_set * readset, fd_set * writeset)
345{
346 if (buffer_len(&c->input) < packet_get_maxsize())
347 FD_SET(c->sock, readset);
348 if (buffer_len(&c->output) > 0)
349 FD_SET(c->sock, writeset);
350}
351
352void
353channel_pre_open_15(Channel *c, fd_set * readset, fd_set * writeset)
354{
355 /* test whether sockets are 'alive' for read/write */
356 if (c->istate == CHAN_INPUT_OPEN)
357 if (buffer_len(&c->input) < packet_get_maxsize())
358 FD_SET(c->sock, readset);
359 if (c->ostate == CHAN_OUTPUT_OPEN ||
360 c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
361 if (buffer_len(&c->output) > 0) {
362 FD_SET(c->sock, writeset);
363 } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
364 chan_obuf_empty(c);
365 }
366 }
367}
368
369void
Damien Miller33b13562000-04-04 14:38:59 +1000370channel_pre_open_20(Channel *c, fd_set * readset, fd_set * writeset)
371{
372 if (c->istate == CHAN_INPUT_OPEN &&
373 c->remote_window > 0 &&
374 buffer_len(&c->input) < c->remote_window)
375 FD_SET(c->rfd, readset);
376 if (c->ostate == CHAN_OUTPUT_OPEN ||
377 c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
378 if (buffer_len(&c->output) > 0) {
379 FD_SET(c->wfd, writeset);
380 } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
381 chan_obuf_empty(c);
382 }
383 }
384 /** XXX check close conditions, too */
385 if (c->efd != -1) {
386 if (c->extended_usage == CHAN_EXTENDED_WRITE &&
387 buffer_len(&c->extended) > 0)
388 FD_SET(c->efd, writeset);
389 else if (c->extended_usage == CHAN_EXTENDED_READ &&
390 buffer_len(&c->extended) < c->remote_window)
391 FD_SET(c->efd, readset);
392 }
393}
394
395void
Damien Millerb38eff82000-04-01 11:09:21 +1000396channel_pre_input_draining(Channel *c, fd_set * readset, fd_set * writeset)
397{
398 if (buffer_len(&c->input) == 0) {
399 packet_start(SSH_MSG_CHANNEL_CLOSE);
400 packet_put_int(c->remote_id);
401 packet_send();
402 c->type = SSH_CHANNEL_CLOSED;
403 debug("Closing channel %d after input drain.", c->self);
404 }
405}
406
407void
408channel_pre_output_draining(Channel *c, fd_set * readset, fd_set * writeset)
409{
410 if (buffer_len(&c->output) == 0)
411 channel_free(c->self);
Damien Miller4af51302000-04-16 11:18:38 +1000412 else
Damien Millerb38eff82000-04-01 11:09:21 +1000413 FD_SET(c->sock, writeset);
414}
415
416/*
417 * This is a special state for X11 authentication spoofing. An opened X11
418 * connection (when authentication spoofing is being done) remains in this
419 * state until the first packet has been completely read. The authentication
420 * data in that packet is then substituted by the real data if it matches the
421 * fake data, and the channel is put into normal mode.
Damien Millerbd483e72000-04-30 10:00:53 +1000422 * XXX All this happens at the client side.
Damien Millerb38eff82000-04-01 11:09:21 +1000423 */
424int
425x11_open_helper(Channel *c)
426{
427 unsigned char *ucp;
428 unsigned int proto_len, data_len;
429
430 /* Check if the fixed size part of the packet is in buffer. */
431 if (buffer_len(&c->output) < 12)
432 return 0;
433
434 /* Parse the lengths of variable-length fields. */
435 ucp = (unsigned char *) buffer_ptr(&c->output);
436 if (ucp[0] == 0x42) { /* Byte order MSB first. */
437 proto_len = 256 * ucp[6] + ucp[7];
438 data_len = 256 * ucp[8] + ucp[9];
439 } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */
440 proto_len = ucp[6] + 256 * ucp[7];
441 data_len = ucp[8] + 256 * ucp[9];
442 } else {
443 debug("Initial X11 packet contains bad byte order byte: 0x%x",
444 ucp[0]);
445 return -1;
446 }
447
448 /* Check if the whole packet is in buffer. */
449 if (buffer_len(&c->output) <
450 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3))
451 return 0;
452
453 /* Check if authentication protocol matches. */
454 if (proto_len != strlen(x11_saved_proto) ||
455 memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) {
456 debug("X11 connection uses different authentication protocol.");
457 return -1;
458 }
459 /* Check if authentication data matches our fake data. */
460 if (data_len != x11_fake_data_len ||
461 memcmp(ucp + 12 + ((proto_len + 3) & ~3),
462 x11_fake_data, x11_fake_data_len) != 0) {
463 debug("X11 auth data does not match fake data.");
464 return -1;
465 }
466 /* Check fake data length */
467 if (x11_fake_data_len != x11_saved_data_len) {
468 error("X11 fake_data_len %d != saved_data_len %d",
469 x11_fake_data_len, x11_saved_data_len);
470 return -1;
471 }
472 /*
473 * Received authentication protocol and data match
474 * our fake data. Substitute the fake data with real
475 * data.
476 */
477 memcpy(ucp + 12 + ((proto_len + 3) & ~3),
478 x11_saved_data, x11_saved_data_len);
479 return 1;
480}
481
482void
483channel_pre_x11_open_13(Channel *c, fd_set * readset, fd_set * writeset)
484{
485 int ret = x11_open_helper(c);
486 if (ret == 1) {
487 /* Start normal processing for the channel. */
488 c->type = SSH_CHANNEL_OPEN;
Damien Miller78928792000-04-12 20:17:38 +1000489 channel_pre_open_13(c, readset, writeset);
Damien Millerb38eff82000-04-01 11:09:21 +1000490 } else if (ret == -1) {
491 /*
492 * We have received an X11 connection that has bad
493 * authentication information.
494 */
495 log("X11 connection rejected because of wrong authentication.\r\n");
496 buffer_clear(&c->input);
497 buffer_clear(&c->output);
498 close(c->sock);
499 c->sock = -1;
500 c->type = SSH_CHANNEL_CLOSED;
501 packet_start(SSH_MSG_CHANNEL_CLOSE);
502 packet_put_int(c->remote_id);
503 packet_send();
504 }
505}
506
507void
Damien Millerbd483e72000-04-30 10:00:53 +1000508channel_pre_x11_open(Channel *c, fd_set * readset, fd_set * writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000509{
510 int ret = x11_open_helper(c);
511 if (ret == 1) {
512 c->type = SSH_CHANNEL_OPEN;
Damien Miller30c3d422000-05-09 11:02:59 +1000513 if (compat20)
514 channel_pre_open_20(c, readset, writeset);
515 else
516 channel_pre_open_15(c, readset, writeset);
Damien Millerb38eff82000-04-01 11:09:21 +1000517 } else if (ret == -1) {
518 debug("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate);
Damien Millerbd483e72000-04-30 10:00:53 +1000519 chan_read_failed(c); /** force close? */
Damien Millerb38eff82000-04-01 11:09:21 +1000520 chan_write_failed(c);
521 debug("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate);
522 }
523}
524
525/* This is our fake X11 server socket. */
526void
527channel_post_x11_listener(Channel *c, fd_set * readset, fd_set * writeset)
528{
529 struct sockaddr addr;
530 int newsock, newch;
531 socklen_t addrlen;
532 char buf[16384], *remote_hostname;
Damien Millerbd483e72000-04-30 10:00:53 +1000533 int remote_port;
Damien Millerb38eff82000-04-01 11:09:21 +1000534
535 if (FD_ISSET(c->sock, readset)) {
536 debug("X11 connection requested.");
537 addrlen = sizeof(addr);
538 newsock = accept(c->sock, &addr, &addrlen);
539 if (newsock < 0) {
540 error("accept: %.100s", strerror(errno));
541 return;
542 }
543 remote_hostname = get_remote_hostname(newsock);
Damien Millerbd483e72000-04-30 10:00:53 +1000544 remote_port = get_peer_port(newsock);
Damien Millerb38eff82000-04-01 11:09:21 +1000545 snprintf(buf, sizeof buf, "X11 connection from %.200s port %d",
Damien Millerbd483e72000-04-30 10:00:53 +1000546 remote_hostname, remote_port);
547
548 newch = channel_new("x11",
549 SSH_CHANNEL_OPENING, newsock, newsock, -1,
550 c->local_window_max, c->local_maxpacket,
551 0, xstrdup(buf));
552 if (compat20) {
553 packet_start(SSH2_MSG_CHANNEL_OPEN);
554 packet_put_cstring("x11");
555 packet_put_int(newch);
556 packet_put_int(c->local_window_max);
557 packet_put_int(c->local_maxpacket);
558 /* originator host and port */
559 packet_put_cstring(remote_hostname);
Damien Miller30c3d422000-05-09 11:02:59 +1000560 if (datafellows & SSH_BUG_X11FWD) {
561 debug("ssh2 x11 bug compat mode");
562 } else {
563 packet_put_int(remote_port);
564 }
Damien Millerbd483e72000-04-30 10:00:53 +1000565 packet_send();
566 } else {
567 packet_start(SSH_SMSG_X11_OPEN);
568 packet_put_int(newch);
569 if (have_hostname_in_open)
570 packet_put_string(buf, strlen(buf));
571 packet_send();
572 }
Damien Millerb38eff82000-04-01 11:09:21 +1000573 xfree(remote_hostname);
Damien Millerb38eff82000-04-01 11:09:21 +1000574 }
575}
576
577/*
578 * This socket is listening for connections to a forwarded TCP/IP port.
579 */
580void
581channel_post_port_listener(Channel *c, fd_set * readset, fd_set * writeset)
582{
583 struct sockaddr addr;
584 int newsock, newch;
585 socklen_t addrlen;
586 char buf[1024], *remote_hostname;
587 int remote_port;
588
589 if (FD_ISSET(c->sock, readset)) {
590 debug("Connection to port %d forwarding "
591 "to %.100s port %d requested.",
592 c->listening_port, c->path, c->host_port);
593 addrlen = sizeof(addr);
594 newsock = accept(c->sock, &addr, &addrlen);
595 if (newsock < 0) {
596 error("accept: %.100s", strerror(errno));
597 return;
598 }
599 remote_hostname = get_remote_hostname(newsock);
600 remote_port = get_peer_port(newsock);
601 snprintf(buf, sizeof buf,
602 "listen port %d for %.100s port %d, "
603 "connect from %.200s port %d",
604 c->listening_port, c->path, c->host_port,
605 remote_hostname, remote_port);
606 newch = channel_new("direct-tcpip",
607 SSH_CHANNEL_OPENING, newsock, newsock, -1,
608 c->local_window_max, c->local_maxpacket,
609 0, xstrdup(buf));
Damien Miller33b13562000-04-04 14:38:59 +1000610 if (compat20) {
611 packet_start(SSH2_MSG_CHANNEL_OPEN);
612 packet_put_cstring("direct-tcpip");
613 packet_put_int(newch);
614 packet_put_int(c->local_window_max);
615 packet_put_int(c->local_maxpacket);
Damien Miller4af51302000-04-16 11:18:38 +1000616 /* target host and port */
Damien Miller33b13562000-04-04 14:38:59 +1000617 packet_put_string(c->path, strlen(c->path));
618 packet_put_int(c->host_port);
Damien Miller4af51302000-04-16 11:18:38 +1000619 /* originator host and port */
Damien Miller33b13562000-04-04 14:38:59 +1000620 packet_put_cstring(remote_hostname);
621 packet_put_int(remote_port);
622 packet_send();
623 } else {
624 packet_start(SSH_MSG_PORT_OPEN);
625 packet_put_int(newch);
626 packet_put_string(c->path, strlen(c->path));
627 packet_put_int(c->host_port);
628 if (have_hostname_in_open) {
629 packet_put_string(buf, strlen(buf));
630 }
631 packet_send();
Damien Millerb38eff82000-04-01 11:09:21 +1000632 }
Damien Millerb38eff82000-04-01 11:09:21 +1000633 xfree(remote_hostname);
634 }
635}
636
637/*
638 * This is the authentication agent socket listening for connections from
639 * clients.
640 */
641void
642channel_post_auth_listener(Channel *c, fd_set * readset, fd_set * writeset)
643{
644 struct sockaddr addr;
645 int newsock, newch;
646 socklen_t addrlen;
647
648 if (FD_ISSET(c->sock, readset)) {
649 addrlen = sizeof(addr);
650 newsock = accept(c->sock, &addr, &addrlen);
651 if (newsock < 0) {
652 error("accept from auth socket: %.100s", strerror(errno));
653 return;
654 }
655 newch = channel_allocate(SSH_CHANNEL_OPENING, newsock,
656 xstrdup("accepted auth socket"));
657 packet_start(SSH_SMSG_AGENT_OPEN);
658 packet_put_int(newch);
659 packet_send();
660 }
661}
662
663int
664channel_handle_rfd(Channel *c, fd_set * readset, fd_set * writeset)
665{
666 char buf[16*1024];
667 int len;
668
669 if (c->rfd != -1 &&
670 FD_ISSET(c->rfd, readset)) {
671 len = read(c->rfd, buf, sizeof(buf));
Damien Miller6f83b8e2000-05-02 09:23:45 +1000672 if (len < 0 && (errno == EINTR || errno == EAGAIN))
673 return 1;
Damien Millerb38eff82000-04-01 11:09:21 +1000674 if (len <= 0) {
Damien Millerbd483e72000-04-30 10:00:53 +1000675 debug("channel %d: read<=0 rfd %d len %d",
Damien Millerb38eff82000-04-01 11:09:21 +1000676 c->self, c->rfd, len);
677 if (compat13) {
678 buffer_consume(&c->output, buffer_len(&c->output));
679 c->type = SSH_CHANNEL_INPUT_DRAINING;
680 debug("Channel %d status set to input draining.", c->self);
681 } else {
682 chan_read_failed(c);
683 }
684 return -1;
685 }
Damien Millerad833b32000-08-23 10:46:23 +1000686 if(c->input_filter != NULL) {
687 if (c->input_filter(c, buf, len) == -1) {
688 debug("filter stops channel %d", c->self);
689 chan_read_failed(c);
690 }
691 } else {
692 buffer_append(&c->input, buf, len);
693 }
Damien Millerb38eff82000-04-01 11:09:21 +1000694 }
695 return 1;
696}
697int
698channel_handle_wfd(Channel *c, fd_set * readset, fd_set * writeset)
699{
700 int len;
701
702 /* Send buffered output data to the socket. */
703 if (c->wfd != -1 &&
704 FD_ISSET(c->wfd, writeset) &&
705 buffer_len(&c->output) > 0) {
706 len = write(c->wfd, buffer_ptr(&c->output),
Damien Miller6f83b8e2000-05-02 09:23:45 +1000707 buffer_len(&c->output));
708 if (len < 0 && (errno == EINTR || errno == EAGAIN))
709 return 1;
Damien Millerb38eff82000-04-01 11:09:21 +1000710 if (len <= 0) {
711 if (compat13) {
712 buffer_consume(&c->output, buffer_len(&c->output));
713 debug("Channel %d status set to input draining.", c->self);
714 c->type = SSH_CHANNEL_INPUT_DRAINING;
715 } else {
716 chan_write_failed(c);
717 }
718 return -1;
719 }
720 buffer_consume(&c->output, len);
Damien Miller33b13562000-04-04 14:38:59 +1000721 if (compat20 && len > 0) {
722 c->local_consumed += len;
723 }
724 }
725 return 1;
726}
727int
728channel_handle_efd(Channel *c, fd_set * readset, fd_set * writeset)
729{
730 char buf[16*1024];
731 int len;
732
Damien Miller1383bd82000-04-06 12:32:37 +1000733/** XXX handle drain efd, too */
Damien Miller33b13562000-04-04 14:38:59 +1000734 if (c->efd != -1) {
735 if (c->extended_usage == CHAN_EXTENDED_WRITE &&
736 FD_ISSET(c->efd, writeset) &&
737 buffer_len(&c->extended) > 0) {
738 len = write(c->efd, buffer_ptr(&c->extended),
739 buffer_len(&c->extended));
Damien Millerd3444942000-09-30 14:20:03 +1100740 debug2("channel %d: written %d to efd %d",
Damien Miller33b13562000-04-04 14:38:59 +1000741 c->self, len, c->efd);
742 if (len > 0) {
743 buffer_consume(&c->extended, len);
744 c->local_consumed += len;
745 }
746 } else if (c->extended_usage == CHAN_EXTENDED_READ &&
747 FD_ISSET(c->efd, readset)) {
748 len = read(c->efd, buf, sizeof(buf));
Damien Millerd3444942000-09-30 14:20:03 +1100749 debug2("channel %d: read %d from efd %d",
Damien Miller33b13562000-04-04 14:38:59 +1000750 c->self, len, c->efd);
Damien Miller1383bd82000-04-06 12:32:37 +1000751 if (len == 0) {
752 debug("channel %d: closing efd %d",
753 c->self, c->efd);
754 close(c->efd);
755 c->efd = -1;
756 } else if (len > 0)
Damien Miller33b13562000-04-04 14:38:59 +1000757 buffer_append(&c->extended, buf, len);
758 }
759 }
760 return 1;
761}
762int
763channel_check_window(Channel *c, fd_set * readset, fd_set * writeset)
764{
Damien Millerefb4afe2000-04-12 18:45:05 +1000765 if (!(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) &&
Damien Miller33b13562000-04-04 14:38:59 +1000766 c->local_window < c->local_window_max/2 &&
767 c->local_consumed > 0) {
768 packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
769 packet_put_int(c->remote_id);
770 packet_put_int(c->local_consumed);
771 packet_send();
Damien Millerd3444942000-09-30 14:20:03 +1100772 debug2("channel %d: window %d sent adjust %d",
Damien Miller33b13562000-04-04 14:38:59 +1000773 c->self, c->local_window,
774 c->local_consumed);
775 c->local_window += c->local_consumed;
776 c->local_consumed = 0;
Damien Millerb38eff82000-04-01 11:09:21 +1000777 }
778 return 1;
779}
780
781void
782channel_post_open_1(Channel *c, fd_set * readset, fd_set * writeset)
783{
784 channel_handle_rfd(c, readset, writeset);
785 channel_handle_wfd(c, readset, writeset);
786}
787
788void
Damien Miller33b13562000-04-04 14:38:59 +1000789channel_post_open_2(Channel *c, fd_set * readset, fd_set * writeset)
790{
791 channel_handle_rfd(c, readset, writeset);
792 channel_handle_wfd(c, readset, writeset);
793 channel_handle_efd(c, readset, writeset);
794 channel_check_window(c, readset, writeset);
795}
796
797void
Damien Millerb38eff82000-04-01 11:09:21 +1000798channel_post_output_drain_13(Channel *c, fd_set * readset, fd_set * writeset)
799{
800 int len;
801 /* Send buffered output data to the socket. */
802 if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) {
803 len = write(c->sock, buffer_ptr(&c->output),
804 buffer_len(&c->output));
805 if (len <= 0)
806 buffer_consume(&c->output, buffer_len(&c->output));
807 else
808 buffer_consume(&c->output, len);
809 }
810}
811
812void
Damien Miller33b13562000-04-04 14:38:59 +1000813channel_handler_init_20(void)
814{
815 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_20;
Damien Millerbd483e72000-04-30 10:00:53 +1000816 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open;
Damien Miller33b13562000-04-04 14:38:59 +1000817 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
Damien Millerbd483e72000-04-30 10:00:53 +1000818 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
Damien Miller33b13562000-04-04 14:38:59 +1000819
820 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open_2;
821 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
Damien Millerbd483e72000-04-30 10:00:53 +1000822 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
Damien Miller33b13562000-04-04 14:38:59 +1000823}
824
825void
Damien Millerb38eff82000-04-01 11:09:21 +1000826channel_handler_init_13(void)
827{
828 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13;
829 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_13;
830 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
831 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
832 channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
833 channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining;
834 channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining;
835
836 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open_1;
837 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
838 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
839 channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
840 channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13;
841}
842
843void
844channel_handler_init_15(void)
845{
846 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_15;
Damien Millerbd483e72000-04-30 10:00:53 +1000847 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open;
Damien Millerb38eff82000-04-01 11:09:21 +1000848 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
849 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
850 channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
851
852 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
853 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
854 channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
855 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open_1;
856}
857
858void
859channel_handler_init(void)
860{
861 int i;
862 for(i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) {
863 channel_pre[i] = NULL;
864 channel_post[i] = NULL;
865 }
Damien Miller33b13562000-04-04 14:38:59 +1000866 if (compat20)
867 channel_handler_init_20();
868 else if (compat13)
Damien Millerb38eff82000-04-01 11:09:21 +1000869 channel_handler_init_13();
870 else
871 channel_handler_init_15();
872}
873
Damien Miller4af51302000-04-16 11:18:38 +1000874void
Damien Millerb38eff82000-04-01 11:09:21 +1000875channel_handler(chan_fn *ftab[], fd_set * readset, fd_set * writeset)
876{
877 static int did_init = 0;
878 int i;
879 Channel *c;
880
881 if (!did_init) {
882 channel_handler_init();
883 did_init = 1;
884 }
885 for (i = 0; i < channels_alloc; i++) {
886 c = &channels[i];
887 if (c->type == SSH_CHANNEL_FREE)
888 continue;
889 if (ftab[c->type] == NULL)
890 continue;
891 (*ftab[c->type])(c, readset, writeset);
Damien Miller33b13562000-04-04 14:38:59 +1000892 chan_delete_if_full_closed(c);
Damien Millerb38eff82000-04-01 11:09:21 +1000893 }
894}
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000895
Damien Miller4af51302000-04-16 11:18:38 +1000896void
Damien Miller95def091999-11-25 00:26:21 +1100897channel_prepare_select(fd_set * readset, fd_set * writeset)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000898{
Damien Millerb38eff82000-04-01 11:09:21 +1000899 channel_handler(channel_pre, readset, writeset);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000900}
901
Damien Miller4af51302000-04-16 11:18:38 +1000902void
Damien Miller95def091999-11-25 00:26:21 +1100903channel_after_select(fd_set * readset, fd_set * writeset)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000904{
Damien Millerb38eff82000-04-01 11:09:21 +1000905 channel_handler(channel_post, readset, writeset);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000906}
907
908/* If there is data to send to the connection, send some of it now. */
909
Damien Miller4af51302000-04-16 11:18:38 +1000910void
Damien Miller95def091999-11-25 00:26:21 +1100911channel_output_poll()
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000912{
Damien Miller95def091999-11-25 00:26:21 +1100913 int len, i;
Damien Millerb38eff82000-04-01 11:09:21 +1000914 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000915
Damien Miller95def091999-11-25 00:26:21 +1100916 for (i = 0; i < channels_alloc; i++) {
Damien Millerb38eff82000-04-01 11:09:21 +1000917 c = &channels[i];
Damien Miller34132e52000-01-14 15:45:46 +1100918
Damien Miller5428f641999-11-25 11:54:57 +1100919 /* We are only interested in channels that can have buffered incoming data. */
Damien Miller34132e52000-01-14 15:45:46 +1100920 if (compat13) {
Damien Millerb38eff82000-04-01 11:09:21 +1000921 if (c->type != SSH_CHANNEL_OPEN &&
922 c->type != SSH_CHANNEL_INPUT_DRAINING)
Damien Miller34132e52000-01-14 15:45:46 +1100923 continue;
924 } else {
Damien Millerb38eff82000-04-01 11:09:21 +1000925 if (c->type != SSH_CHANNEL_OPEN)
Damien Miller34132e52000-01-14 15:45:46 +1100926 continue;
Damien Millerb38eff82000-04-01 11:09:21 +1000927 if (c->istate != CHAN_INPUT_OPEN &&
928 c->istate != CHAN_INPUT_WAIT_DRAIN)
Damien Miller34132e52000-01-14 15:45:46 +1100929 continue;
930 }
Damien Millerefb4afe2000-04-12 18:45:05 +1000931 if (compat20 &&
932 (c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) {
Damien Miller33b13562000-04-04 14:38:59 +1000933 debug("channel: %d: no data after CLOSE", c->self);
934 continue;
935 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000936
Damien Miller95def091999-11-25 00:26:21 +1100937 /* Get the amount of buffered data for this channel. */
Damien Millerb38eff82000-04-01 11:09:21 +1000938 len = buffer_len(&c->input);
Damien Miller95def091999-11-25 00:26:21 +1100939 if (len > 0) {
Damien Miller5428f641999-11-25 11:54:57 +1100940 /* Send some data for the other side over the secure connection. */
Damien Miller33b13562000-04-04 14:38:59 +1000941 if (compat20) {
942 if (len > c->remote_window)
943 len = c->remote_window;
944 if (len > c->remote_maxpacket)
945 len = c->remote_maxpacket;
Damien Miller95def091999-11-25 00:26:21 +1100946 } else {
Damien Miller33b13562000-04-04 14:38:59 +1000947 if (packet_is_interactive()) {
948 if (len > 1024)
949 len = 512;
950 } else {
951 /* Keep the packets at reasonable size. */
952 if (len > packet_get_maxsize()/2)
953 len = packet_get_maxsize()/2;
954 }
Damien Miller95def091999-11-25 00:26:21 +1100955 }
Damien Millerb38eff82000-04-01 11:09:21 +1000956 if (len > 0) {
Damien Miller33b13562000-04-04 14:38:59 +1000957 packet_start(compat20 ?
958 SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA);
Damien Millerb38eff82000-04-01 11:09:21 +1000959 packet_put_int(c->remote_id);
960 packet_put_string(buffer_ptr(&c->input), len);
961 packet_send();
962 buffer_consume(&c->input, len);
963 c->remote_window -= len;
Damien Millerb38eff82000-04-01 11:09:21 +1000964 }
965 } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) {
Damien Miller95def091999-11-25 00:26:21 +1100966 if (compat13)
967 fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3");
Damien Miller5428f641999-11-25 11:54:57 +1100968 /*
969 * input-buffer is empty and read-socket shutdown:
970 * tell peer, that we will not send more data: send IEOF
971 */
Damien Millerb38eff82000-04-01 11:09:21 +1000972 chan_ibuf_empty(c);
Damien Miller95def091999-11-25 00:26:21 +1100973 }
Damien Miller33b13562000-04-04 14:38:59 +1000974 /* Send extended data, i.e. stderr */
975 if (compat20 &&
976 c->remote_window > 0 &&
977 (len = buffer_len(&c->extended)) > 0 &&
978 c->extended_usage == CHAN_EXTENDED_READ) {
979 if (len > c->remote_window)
980 len = c->remote_window;
981 if (len > c->remote_maxpacket)
982 len = c->remote_maxpacket;
983 packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA);
984 packet_put_int(c->remote_id);
985 packet_put_int(SSH2_EXTENDED_DATA_STDERR);
986 packet_put_string(buffer_ptr(&c->extended), len);
987 packet_send();
988 buffer_consume(&c->extended, len);
989 c->remote_window -= len;
990 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000991 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000992}
993
Damien Miller5428f641999-11-25 11:54:57 +1100994/*
995 * This is called when a packet of type CHANNEL_DATA has just been received.
996 * The message type has already been consumed, but channel number and data is
997 * still there.
998 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000999
Damien Miller4af51302000-04-16 11:18:38 +10001000void
Damien Miller62cee002000-09-23 17:15:56 +11001001channel_input_data(int type, int plen, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001002{
Damien Miller34132e52000-01-14 15:45:46 +11001003 int id;
Damien Miller95def091999-11-25 00:26:21 +11001004 char *data;
1005 unsigned int data_len;
Damien Millerb38eff82000-04-01 11:09:21 +10001006 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001007
Damien Miller95def091999-11-25 00:26:21 +11001008 /* Get the channel number and verify it. */
Damien Miller34132e52000-01-14 15:45:46 +11001009 id = packet_get_int();
Damien Millerb38eff82000-04-01 11:09:21 +10001010 c = channel_lookup(id);
1011 if (c == NULL)
Damien Miller34132e52000-01-14 15:45:46 +11001012 packet_disconnect("Received data for nonexistent channel %d.", id);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001013
Damien Miller95def091999-11-25 00:26:21 +11001014 /* Ignore any data for non-open channels (might happen on close) */
Damien Millerb38eff82000-04-01 11:09:21 +10001015 if (c->type != SSH_CHANNEL_OPEN &&
1016 c->type != SSH_CHANNEL_X11_OPEN)
Damien Miller34132e52000-01-14 15:45:46 +11001017 return;
1018
1019 /* same for protocol 1.5 if output end is no longer open */
Damien Millerb38eff82000-04-01 11:09:21 +10001020 if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN)
Damien Miller95def091999-11-25 00:26:21 +11001021 return;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001022
Damien Miller95def091999-11-25 00:26:21 +11001023 /* Get the data. */
1024 data = packet_get_string(&data_len);
Damien Miller4af51302000-04-16 11:18:38 +10001025 packet_done();
Damien Millerb38eff82000-04-01 11:09:21 +10001026
Damien Miller33b13562000-04-04 14:38:59 +10001027 if (compat20){
1028 if (data_len > c->local_maxpacket) {
1029 log("channel %d: rcvd big packet %d, maxpack %d",
1030 c->self, data_len, c->local_maxpacket);
1031 }
1032 if (data_len > c->local_window) {
1033 log("channel %d: rcvd too much data %d, win %d",
1034 c->self, data_len, c->local_window);
1035 xfree(data);
1036 return;
1037 }
1038 c->local_window -= data_len;
1039 }else{
1040 packet_integrity_check(plen, 4 + 4 + data_len, type);
1041 }
Damien Millerb38eff82000-04-01 11:09:21 +10001042 buffer_append(&c->output, data, data_len);
Damien Miller95def091999-11-25 00:26:21 +11001043 xfree(data);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001044}
Damien Miller4af51302000-04-16 11:18:38 +10001045void
Damien Miller62cee002000-09-23 17:15:56 +11001046channel_input_extended_data(int type, int plen, void *ctxt)
Damien Miller33b13562000-04-04 14:38:59 +10001047{
1048 int id;
1049 int tcode;
1050 char *data;
1051 unsigned int data_len;
1052 Channel *c;
1053
1054 /* Get the channel number and verify it. */
1055 id = packet_get_int();
1056 c = channel_lookup(id);
1057
1058 if (c == NULL)
1059 packet_disconnect("Received extended_data for bad channel %d.", id);
1060 if (c->type != SSH_CHANNEL_OPEN) {
1061 log("channel %d: ext data for non open", id);
1062 return;
1063 }
1064 tcode = packet_get_int();
1065 if (c->efd == -1 ||
1066 c->extended_usage != CHAN_EXTENDED_WRITE ||
1067 tcode != SSH2_EXTENDED_DATA_STDERR) {
1068 log("channel %d: bad ext data", c->self);
1069 return;
1070 }
1071 data = packet_get_string(&data_len);
Damien Miller4af51302000-04-16 11:18:38 +10001072 packet_done();
Damien Miller33b13562000-04-04 14:38:59 +10001073 if (data_len > c->local_window) {
1074 log("channel %d: rcvd too much extended_data %d, win %d",
1075 c->self, data_len, c->local_window);
1076 xfree(data);
1077 return;
1078 }
Damien Millerd3444942000-09-30 14:20:03 +11001079 debug2("channel %d: rcvd ext data %d", c->self, data_len);
Damien Miller33b13562000-04-04 14:38:59 +10001080 c->local_window -= data_len;
1081 buffer_append(&c->extended, data, data_len);
1082 xfree(data);
1083}
1084
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001085
Damien Miller5428f641999-11-25 11:54:57 +11001086/*
1087 * Returns true if no channel has too much buffered data, and false if one or
1088 * more channel is overfull.
1089 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001090
Damien Miller4af51302000-04-16 11:18:38 +10001091int
Damien Miller95def091999-11-25 00:26:21 +11001092channel_not_very_much_buffered_data()
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001093{
Damien Miller95def091999-11-25 00:26:21 +11001094 unsigned int i;
Damien Millerb38eff82000-04-01 11:09:21 +10001095 Channel *c;
Damien Miller95def091999-11-25 00:26:21 +11001096
1097 for (i = 0; i < channels_alloc; i++) {
Damien Millerb38eff82000-04-01 11:09:21 +10001098 c = &channels[i];
1099 if (c->type == SSH_CHANNEL_OPEN) {
Damien Miller33b13562000-04-04 14:38:59 +10001100 if (!compat20 && buffer_len(&c->input) > packet_get_maxsize()) {
Damien Millerb38eff82000-04-01 11:09:21 +10001101 debug("channel %d: big input buffer %d",
1102 c->self, buffer_len(&c->input));
Damien Miller95def091999-11-25 00:26:21 +11001103 return 0;
Damien Millerb38eff82000-04-01 11:09:21 +10001104 }
1105 if (buffer_len(&c->output) > packet_get_maxsize()) {
1106 debug("channel %d: big output buffer %d",
1107 c->self, buffer_len(&c->output));
Damien Miller95def091999-11-25 00:26:21 +11001108 return 0;
Damien Millerb38eff82000-04-01 11:09:21 +10001109 }
Damien Miller95def091999-11-25 00:26:21 +11001110 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001111 }
Damien Miller95def091999-11-25 00:26:21 +11001112 return 1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001113}
1114
Damien Miller4af51302000-04-16 11:18:38 +10001115void
Damien Miller62cee002000-09-23 17:15:56 +11001116channel_input_ieof(int type, int plen, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10001117{
1118 int id;
1119 Channel *c;
1120
1121 packet_integrity_check(plen, 4, type);
1122
1123 id = packet_get_int();
1124 c = channel_lookup(id);
1125 if (c == NULL)
1126 packet_disconnect("Received ieof for nonexistent channel %d.", id);
1127 chan_rcvd_ieof(c);
1128}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001129
Damien Miller4af51302000-04-16 11:18:38 +10001130void
Damien Miller62cee002000-09-23 17:15:56 +11001131channel_input_close(int type, int plen, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001132{
Damien Millerb38eff82000-04-01 11:09:21 +10001133 int id;
1134 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001135
Damien Millerb38eff82000-04-01 11:09:21 +10001136 packet_integrity_check(plen, 4, type);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001137
Damien Millerb38eff82000-04-01 11:09:21 +10001138 id = packet_get_int();
1139 c = channel_lookup(id);
1140 if (c == NULL)
1141 packet_disconnect("Received close for nonexistent channel %d.", id);
Damien Miller5428f641999-11-25 11:54:57 +11001142
1143 /*
1144 * Send a confirmation that we have closed the channel and no more
1145 * data is coming for it.
1146 */
Damien Miller95def091999-11-25 00:26:21 +11001147 packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION);
Damien Millerb38eff82000-04-01 11:09:21 +10001148 packet_put_int(c->remote_id);
Damien Miller95def091999-11-25 00:26:21 +11001149 packet_send();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001150
Damien Miller5428f641999-11-25 11:54:57 +11001151 /*
1152 * If the channel is in closed state, we have sent a close request,
1153 * and the other side will eventually respond with a confirmation.
1154 * Thus, we cannot free the channel here, because then there would be
1155 * no-one to receive the confirmation. The channel gets freed when
1156 * the confirmation arrives.
1157 */
Damien Millerb38eff82000-04-01 11:09:21 +10001158 if (c->type != SSH_CHANNEL_CLOSED) {
Damien Miller5428f641999-11-25 11:54:57 +11001159 /*
1160 * Not a closed channel - mark it as draining, which will
1161 * cause it to be freed later.
1162 */
Damien Millerb38eff82000-04-01 11:09:21 +10001163 buffer_consume(&c->input, buffer_len(&c->input));
1164 c->type = SSH_CHANNEL_OUTPUT_DRAINING;
Damien Miller95def091999-11-25 00:26:21 +11001165 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001166}
1167
Damien Millerb38eff82000-04-01 11:09:21 +10001168/* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */
Damien Miller4af51302000-04-16 11:18:38 +10001169void
Damien Miller62cee002000-09-23 17:15:56 +11001170channel_input_oclose(int type, int plen, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001171{
Damien Millerb38eff82000-04-01 11:09:21 +10001172 int id = packet_get_int();
1173 Channel *c = channel_lookup(id);
1174 packet_integrity_check(plen, 4, type);
1175 if (c == NULL)
1176 packet_disconnect("Received oclose for nonexistent channel %d.", id);
1177 chan_rcvd_oclose(c);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001178}
1179
Damien Miller4af51302000-04-16 11:18:38 +10001180void
Damien Miller62cee002000-09-23 17:15:56 +11001181channel_input_close_confirmation(int type, int plen, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10001182{
1183 int id = packet_get_int();
1184 Channel *c = channel_lookup(id);
1185
Damien Miller4af51302000-04-16 11:18:38 +10001186 packet_done();
Damien Millerb38eff82000-04-01 11:09:21 +10001187 if (c == NULL)
1188 packet_disconnect("Received close confirmation for "
1189 "out-of-range channel %d.", id);
1190 if (c->type != SSH_CHANNEL_CLOSED)
1191 packet_disconnect("Received close confirmation for "
1192 "non-closed channel %d (type %d).", id, c->type);
1193 channel_free(c->self);
1194}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001195
Damien Miller4af51302000-04-16 11:18:38 +10001196void
Damien Miller62cee002000-09-23 17:15:56 +11001197channel_input_open_confirmation(int type, int plen, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001198{
Damien Millerb38eff82000-04-01 11:09:21 +10001199 int id, remote_id;
1200 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001201
Damien Miller33b13562000-04-04 14:38:59 +10001202 if (!compat20)
1203 packet_integrity_check(plen, 4 + 4, type);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001204
Damien Millerb38eff82000-04-01 11:09:21 +10001205 id = packet_get_int();
1206 c = channel_lookup(id);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001207
Damien Millerb38eff82000-04-01 11:09:21 +10001208 if (c==NULL || c->type != SSH_CHANNEL_OPENING)
1209 packet_disconnect("Received open confirmation for "
1210 "non-opening channel %d.", id);
1211 remote_id = packet_get_int();
Damien Miller5428f641999-11-25 11:54:57 +11001212 /* Record the remote channel number and mark that the channel is now open. */
Damien Millerb38eff82000-04-01 11:09:21 +10001213 c->remote_id = remote_id;
1214 c->type = SSH_CHANNEL_OPEN;
Damien Miller33b13562000-04-04 14:38:59 +10001215
1216 if (compat20) {
1217 c->remote_window = packet_get_int();
1218 c->remote_maxpacket = packet_get_int();
Damien Miller4af51302000-04-16 11:18:38 +10001219 packet_done();
Damien Miller33b13562000-04-04 14:38:59 +10001220 if (c->cb_fn != NULL && c->cb_event == type) {
Damien Millerd3444942000-09-30 14:20:03 +11001221 debug2("callback start");
Damien Miller33b13562000-04-04 14:38:59 +10001222 c->cb_fn(c->self, c->cb_arg);
Damien Millerd3444942000-09-30 14:20:03 +11001223 debug2("callback done");
Damien Miller33b13562000-04-04 14:38:59 +10001224 }
1225 debug("channel %d: open confirm rwindow %d rmax %d", c->self,
1226 c->remote_window, c->remote_maxpacket);
1227 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001228}
1229
Damien Miller4af51302000-04-16 11:18:38 +10001230void
Damien Miller62cee002000-09-23 17:15:56 +11001231channel_input_open_failure(int type, int plen, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001232{
Damien Millerb38eff82000-04-01 11:09:21 +10001233 int id;
1234 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001235
Damien Miller33b13562000-04-04 14:38:59 +10001236 if (!compat20)
1237 packet_integrity_check(plen, 4, type);
Damien Millerb38eff82000-04-01 11:09:21 +10001238
1239 id = packet_get_int();
1240 c = channel_lookup(id);
1241
1242 if (c==NULL || c->type != SSH_CHANNEL_OPENING)
1243 packet_disconnect("Received open failure for "
1244 "non-opening channel %d.", id);
Damien Miller33b13562000-04-04 14:38:59 +10001245 if (compat20) {
1246 int reason = packet_get_int();
1247 char *msg = packet_get_string(NULL);
Damien Miller4af51302000-04-16 11:18:38 +10001248 char *lang = packet_get_string(NULL);
Damien Miller33b13562000-04-04 14:38:59 +10001249 log("channel_open_failure: %d: reason %d: %s", id, reason, msg);
Damien Miller4af51302000-04-16 11:18:38 +10001250 packet_done();
Damien Miller33b13562000-04-04 14:38:59 +10001251 xfree(msg);
Damien Miller4af51302000-04-16 11:18:38 +10001252 xfree(lang);
Damien Miller33b13562000-04-04 14:38:59 +10001253 }
Damien Miller95def091999-11-25 00:26:21 +11001254 /* Free the channel. This will also close the socket. */
Damien Millerb38eff82000-04-01 11:09:21 +10001255 channel_free(id);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001256}
1257
Damien Miller33b13562000-04-04 14:38:59 +10001258void
Damien Miller62cee002000-09-23 17:15:56 +11001259channel_input_channel_request(int type, int plen, void *ctxt)
Damien Miller33b13562000-04-04 14:38:59 +10001260{
1261 int id;
1262 Channel *c;
1263
1264 id = packet_get_int();
1265 c = channel_lookup(id);
1266
1267 if (c == NULL ||
1268 (c->type != SSH_CHANNEL_OPEN && c->type != SSH_CHANNEL_LARVAL))
1269 packet_disconnect("Received request for "
1270 "non-open channel %d.", id);
1271 if (c->cb_fn != NULL && c->cb_event == type) {
Damien Millerd3444942000-09-30 14:20:03 +11001272 debug2("callback start");
Damien Miller33b13562000-04-04 14:38:59 +10001273 c->cb_fn(c->self, c->cb_arg);
Damien Millerd3444942000-09-30 14:20:03 +11001274 debug2("callback done");
Damien Miller33b13562000-04-04 14:38:59 +10001275 } else {
1276 char *service = packet_get_string(NULL);
1277 debug("channel: %d rcvd request for %s", c->self, service);
Damien Millerd3444942000-09-30 14:20:03 +11001278 debug("cb_fn %p cb_event %d", c->cb_fn , c->cb_event);
Damien Miller33b13562000-04-04 14:38:59 +10001279 xfree(service);
1280 }
1281}
1282
Damien Miller4af51302000-04-16 11:18:38 +10001283void
Damien Miller62cee002000-09-23 17:15:56 +11001284channel_input_window_adjust(int type, int plen, void *ctxt)
Damien Miller33b13562000-04-04 14:38:59 +10001285{
1286 Channel *c;
1287 int id, adjust;
1288
1289 if (!compat20)
1290 return;
1291
1292 /* Get the channel number and verify it. */
1293 id = packet_get_int();
1294 c = channel_lookup(id);
1295
1296 if (c == NULL || c->type != SSH_CHANNEL_OPEN) {
1297 log("Received window adjust for "
1298 "non-open channel %d.", id);
1299 return;
1300 }
1301 adjust = packet_get_int();
Damien Miller4af51302000-04-16 11:18:38 +10001302 packet_done();
Damien Millerd3444942000-09-30 14:20:03 +11001303 debug2("channel %d: rcvd adjust %d", id, adjust);
Damien Miller33b13562000-04-04 14:38:59 +10001304 c->remote_window += adjust;
1305}
1306
Damien Miller5428f641999-11-25 11:54:57 +11001307/*
1308 * Stops listening for channels, and removes any unix domain sockets that we
1309 * might have.
1310 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001311
Damien Miller4af51302000-04-16 11:18:38 +10001312void
Damien Miller95def091999-11-25 00:26:21 +11001313channel_stop_listening()
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001314{
Damien Miller95def091999-11-25 00:26:21 +11001315 int i;
1316 for (i = 0; i < channels_alloc; i++) {
1317 switch (channels[i].type) {
1318 case SSH_CHANNEL_AUTH_SOCKET:
1319 close(channels[i].sock);
Damien Miller78315eb2000-09-29 23:01:36 +11001320 unlink(channels[i].path);
Damien Miller95def091999-11-25 00:26:21 +11001321 channel_free(i);
1322 break;
1323 case SSH_CHANNEL_PORT_LISTENER:
1324 case SSH_CHANNEL_X11_LISTENER:
1325 close(channels[i].sock);
1326 channel_free(i);
1327 break;
1328 default:
1329 break;
1330 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001331 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001332}
1333
Damien Miller5428f641999-11-25 11:54:57 +11001334/*
Damien Miller6f83b8e2000-05-02 09:23:45 +10001335 * Closes the sockets/fds of all channels. This is used to close extra file
Damien Miller5428f641999-11-25 11:54:57 +11001336 * descriptors after a fork.
1337 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001338
Damien Miller4af51302000-04-16 11:18:38 +10001339void
Damien Miller95def091999-11-25 00:26:21 +11001340channel_close_all()
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001341{
Damien Miller95def091999-11-25 00:26:21 +11001342 int i;
Damien Miller6f83b8e2000-05-02 09:23:45 +10001343 for (i = 0; i < channels_alloc; i++)
Damien Miller95def091999-11-25 00:26:21 +11001344 if (channels[i].type != SSH_CHANNEL_FREE)
Damien Miller6f83b8e2000-05-02 09:23:45 +10001345 channel_close_fds(&channels[i]);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001346}
1347
1348/* Returns the maximum file descriptor number used by the channels. */
1349
Damien Miller4af51302000-04-16 11:18:38 +10001350int
Damien Miller95def091999-11-25 00:26:21 +11001351channel_max_fd()
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001352{
Damien Miller95def091999-11-25 00:26:21 +11001353 return channel_max_fd_value;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001354}
1355
1356/* Returns true if any channel is still open. */
1357
Damien Miller4af51302000-04-16 11:18:38 +10001358int
Damien Miller95def091999-11-25 00:26:21 +11001359channel_still_open()
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001360{
Damien Miller95def091999-11-25 00:26:21 +11001361 unsigned int i;
1362 for (i = 0; i < channels_alloc; i++)
1363 switch (channels[i].type) {
1364 case SSH_CHANNEL_FREE:
1365 case SSH_CHANNEL_X11_LISTENER:
1366 case SSH_CHANNEL_PORT_LISTENER:
1367 case SSH_CHANNEL_CLOSED:
1368 case SSH_CHANNEL_AUTH_SOCKET:
1369 continue;
Damien Miller33b13562000-04-04 14:38:59 +10001370 case SSH_CHANNEL_LARVAL:
1371 if (!compat20)
1372 fatal("cannot happen: SSH_CHANNEL_LARVAL");
1373 continue;
Damien Miller95def091999-11-25 00:26:21 +11001374 case SSH_CHANNEL_OPENING:
1375 case SSH_CHANNEL_OPEN:
1376 case SSH_CHANNEL_X11_OPEN:
1377 return 1;
1378 case SSH_CHANNEL_INPUT_DRAINING:
1379 case SSH_CHANNEL_OUTPUT_DRAINING:
1380 if (!compat13)
1381 fatal("cannot happen: OUT_DRAIN");
1382 return 1;
1383 default:
1384 fatal("channel_still_open: bad channel type %d", channels[i].type);
1385 /* NOTREACHED */
1386 }
1387 return 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001388}
1389
Damien Miller5428f641999-11-25 11:54:57 +11001390/*
1391 * Returns a message describing the currently open forwarded connections,
1392 * suitable for sending to the client. The message contains crlf pairs for
1393 * newlines.
1394 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001395
Damien Miller95def091999-11-25 00:26:21 +11001396char *
1397channel_open_message()
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001398{
Damien Miller95def091999-11-25 00:26:21 +11001399 Buffer buffer;
1400 int i;
1401 char buf[512], *cp;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001402
Damien Miller95def091999-11-25 00:26:21 +11001403 buffer_init(&buffer);
1404 snprintf(buf, sizeof buf, "The following connections are open:\r\n");
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001405 buffer_append(&buffer, buf, strlen(buf));
Damien Miller95def091999-11-25 00:26:21 +11001406 for (i = 0; i < channels_alloc; i++) {
1407 Channel *c = &channels[i];
1408 switch (c->type) {
1409 case SSH_CHANNEL_FREE:
1410 case SSH_CHANNEL_X11_LISTENER:
1411 case SSH_CHANNEL_PORT_LISTENER:
1412 case SSH_CHANNEL_CLOSED:
1413 case SSH_CHANNEL_AUTH_SOCKET:
1414 continue;
Damien Miller33b13562000-04-04 14:38:59 +10001415 case SSH_CHANNEL_LARVAL:
Damien Miller95def091999-11-25 00:26:21 +11001416 case SSH_CHANNEL_OPENING:
1417 case SSH_CHANNEL_OPEN:
1418 case SSH_CHANNEL_X11_OPEN:
1419 case SSH_CHANNEL_INPUT_DRAINING:
1420 case SSH_CHANNEL_OUTPUT_DRAINING:
Damien Millerb38eff82000-04-01 11:09:21 +10001421 snprintf(buf, sizeof buf, " #%d %.300s (t%d r%d i%d/%d o%d/%d fd %d/%d)\r\n",
Damien Miller34132e52000-01-14 15:45:46 +11001422 c->self, c->remote_name,
1423 c->type, c->remote_id,
1424 c->istate, buffer_len(&c->input),
Damien Millerb38eff82000-04-01 11:09:21 +10001425 c->ostate, buffer_len(&c->output),
1426 c->rfd, c->wfd);
Damien Miller95def091999-11-25 00:26:21 +11001427 buffer_append(&buffer, buf, strlen(buf));
1428 continue;
1429 default:
Damien Millerb38eff82000-04-01 11:09:21 +10001430 fatal("channel_open_message: bad channel type %d", c->type);
Damien Miller95def091999-11-25 00:26:21 +11001431 /* NOTREACHED */
1432 }
1433 }
1434 buffer_append(&buffer, "\0", 1);
1435 cp = xstrdup(buffer_ptr(&buffer));
1436 buffer_free(&buffer);
1437 return cp;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001438}
1439
Damien Miller5428f641999-11-25 11:54:57 +11001440/*
1441 * Initiate forwarding of connections to local port "port" through the secure
1442 * channel to host:port from remote side.
1443 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001444
Damien Miller4af51302000-04-16 11:18:38 +10001445void
Damien Milleraae6c611999-12-06 11:47:28 +11001446channel_request_local_forwarding(u_short port, const char *host,
Damien Millera34a28b1999-12-14 10:47:15 +11001447 u_short host_port, int gateway_ports)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001448{
Damien Miller34132e52000-01-14 15:45:46 +11001449 int success, ch, sock, on = 1;
1450 struct addrinfo hints, *ai, *aitop;
1451 char ntop[NI_MAXHOST], strport[NI_MAXSERV];
Damien Miller5428f641999-11-25 11:54:57 +11001452 struct linger linger;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001453
Damien Miller95def091999-11-25 00:26:21 +11001454 if (strlen(host) > sizeof(channels[0].path) - 1)
1455 packet_disconnect("Forward host name too long.");
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001456
Damien Miller5428f641999-11-25 11:54:57 +11001457 /*
Damien Miller34132e52000-01-14 15:45:46 +11001458 * getaddrinfo returns a loopback address if the hostname is
1459 * set to NULL and hints.ai_flags is not AI_PASSIVE
Damien Miller5428f641999-11-25 11:54:57 +11001460 */
Damien Miller34132e52000-01-14 15:45:46 +11001461 memset(&hints, 0, sizeof(hints));
1462 hints.ai_family = IPv4or6;
1463 hints.ai_flags = gateway_ports ? AI_PASSIVE : 0;
1464 hints.ai_socktype = SOCK_STREAM;
1465 snprintf(strport, sizeof strport, "%d", port);
1466 if (getaddrinfo(NULL, strport, &hints, &aitop) != 0)
1467 packet_disconnect("getaddrinfo: fatal error");
Damien Miller5428f641999-11-25 11:54:57 +11001468
Damien Miller34132e52000-01-14 15:45:46 +11001469 success = 0;
1470 for (ai = aitop; ai; ai = ai->ai_next) {
1471 if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
1472 continue;
1473 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop),
1474 strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
1475 error("channel_request_local_forwarding: getnameinfo failed");
1476 continue;
1477 }
1478 /* Create a port to listen for the host. */
1479 sock = socket(ai->ai_family, SOCK_STREAM, 0);
1480 if (sock < 0) {
1481 /* this is no error since kernel may not support ipv6 */
1482 verbose("socket: %.100s", strerror(errno));
1483 continue;
1484 }
1485 /*
1486 * Set socket options. We would like the socket to disappear
1487 * as soon as it has been closed for whatever reason.
1488 */
1489 setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void *)&on, sizeof(on));
1490 linger.l_onoff = 1;
1491 linger.l_linger = 5;
1492 setsockopt(sock, SOL_SOCKET, SO_LINGER, (void *)&linger, sizeof(linger));
1493 debug("Local forwarding listening on %s port %s.", ntop, strport);
Damien Miller95def091999-11-25 00:26:21 +11001494
Damien Miller34132e52000-01-14 15:45:46 +11001495 /* Bind the socket to the address. */
1496 if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
1497 /* address can be in use ipv6 address is already bound */
Damien Miller3c7eeb22000-03-03 22:35:33 +11001498 if (!ai->ai_next)
1499 error("bind: %.100s", strerror(errno));
1500 else
1501 verbose("bind: %.100s", strerror(errno));
1502
Damien Miller34132e52000-01-14 15:45:46 +11001503 close(sock);
1504 continue;
1505 }
1506 /* Start listening for connections on the socket. */
1507 if (listen(sock, 5) < 0) {
1508 error("listen: %.100s", strerror(errno));
1509 close(sock);
1510 continue;
1511 }
1512 /* Allocate a channel number for the socket. */
Damien Millerb38eff82000-04-01 11:09:21 +10001513 ch = channel_new(
1514 "port listener", SSH_CHANNEL_PORT_LISTENER,
1515 sock, sock, -1,
Damien Millerbd483e72000-04-30 10:00:53 +10001516 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
Damien Millerb38eff82000-04-01 11:09:21 +10001517 0, xstrdup("port listener"));
Damien Miller34132e52000-01-14 15:45:46 +11001518 strlcpy(channels[ch].path, host, sizeof(channels[ch].path));
1519 channels[ch].host_port = host_port;
1520 channels[ch].listening_port = port;
1521 success = 1;
1522 }
1523 if (success == 0)
1524 packet_disconnect("cannot listen port: %d", port);
1525 freeaddrinfo(aitop);
Damien Miller95def091999-11-25 00:26:21 +11001526}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001527
Damien Miller5428f641999-11-25 11:54:57 +11001528/*
1529 * Initiate forwarding of connections to port "port" on remote host through
1530 * the secure channel to host:port from local side.
1531 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001532
Damien Miller4af51302000-04-16 11:18:38 +10001533void
Damien Millerb38eff82000-04-01 11:09:21 +10001534channel_request_remote_forwarding(u_short listen_port, const char *host_to_connect,
1535 u_short port_to_connect)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001536{
Damien Miller95def091999-11-25 00:26:21 +11001537 int payload_len;
1538 /* Record locally that connection to this host/port is permitted. */
1539 if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION)
1540 fatal("channel_request_remote_forwarding: too many forwards");
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001541
Damien Millerb38eff82000-04-01 11:09:21 +10001542 permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host_to_connect);
1543 permitted_opens[num_permitted_opens].port_to_connect = port_to_connect;
1544 permitted_opens[num_permitted_opens].listen_port = listen_port;
Damien Miller95def091999-11-25 00:26:21 +11001545 num_permitted_opens++;
1546
1547 /* Send the forward request to the remote side. */
Damien Miller33b13562000-04-04 14:38:59 +10001548 if (compat20) {
1549 const char *address_to_bind = "0.0.0.0";
1550 packet_start(SSH2_MSG_GLOBAL_REQUEST);
1551 packet_put_cstring("tcpip-forward");
1552 packet_put_char(0); /* boolean: want reply */
1553 packet_put_cstring(address_to_bind);
1554 packet_put_int(listen_port);
1555 } else {
1556 packet_start(SSH_CMSG_PORT_FORWARD_REQUEST);
Damien Miller33b13562000-04-04 14:38:59 +10001557 packet_put_int(listen_port);
Damien Miller8bb73be2000-04-19 16:26:12 +10001558 packet_put_cstring(host_to_connect);
1559 packet_put_int(port_to_connect);
Damien Miller33b13562000-04-04 14:38:59 +10001560 packet_send();
1561 packet_write_wait();
1562 /*
1563 * Wait for response from the remote side. It will send a disconnect
1564 * message on failure, and we will never see it here.
1565 */
1566 packet_read_expect(&payload_len, SSH_SMSG_SUCCESS);
1567 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001568}
1569
Damien Miller5428f641999-11-25 11:54:57 +11001570/*
1571 * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates
1572 * listening for the port, and sends back a success reply (or disconnect
1573 * message if there was an error). This never returns if there was an error.
1574 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001575
Damien Miller4af51302000-04-16 11:18:38 +10001576void
Damien Millere247cc42000-05-07 12:03:14 +10001577channel_input_port_forward_request(int is_root, int gateway_ports)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001578{
Damien Milleraae6c611999-12-06 11:47:28 +11001579 u_short port, host_port;
Damien Miller95def091999-11-25 00:26:21 +11001580 char *hostname;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001581
Damien Miller95def091999-11-25 00:26:21 +11001582 /* Get arguments from the packet. */
1583 port = packet_get_int();
1584 hostname = packet_get_string(NULL);
1585 host_port = packet_get_int();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001586
Damien Millerbac2d8a2000-09-05 16:13:06 +11001587#ifndef HAVE_CYGWIN
Damien Miller5428f641999-11-25 11:54:57 +11001588 /*
1589 * Check that an unprivileged user is not trying to forward a
1590 * privileged port.
1591 */
Damien Miller95def091999-11-25 00:26:21 +11001592 if (port < IPPORT_RESERVED && !is_root)
1593 packet_disconnect("Requested forwarding of port %d but user is not root.",
1594 port);
Damien Millerbac2d8a2000-09-05 16:13:06 +11001595#endif
Damien Millera34a28b1999-12-14 10:47:15 +11001596 /*
1597 * Initiate forwarding,
Damien Millera34a28b1999-12-14 10:47:15 +11001598 */
Damien Millere247cc42000-05-07 12:03:14 +10001599 channel_request_local_forwarding(port, hostname, host_port, gateway_ports);
Damien Miller95def091999-11-25 00:26:21 +11001600
1601 /* Free the argument string. */
1602 xfree(hostname);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001603}
1604
Damien Millerb38eff82000-04-01 11:09:21 +10001605/* XXX move to aux.c */
1606int
1607channel_connect_to(const char *host, u_short host_port)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001608{
Damien Miller34132e52000-01-14 15:45:46 +11001609 struct addrinfo hints, *ai, *aitop;
1610 char ntop[NI_MAXHOST], strport[NI_MAXSERV];
1611 int gaierr;
Damien Millerb38eff82000-04-01 11:09:21 +10001612 int sock = -1;
Damien Miller95def091999-11-25 00:26:21 +11001613
Damien Miller34132e52000-01-14 15:45:46 +11001614 memset(&hints, 0, sizeof(hints));
1615 hints.ai_family = IPv4or6;
1616 hints.ai_socktype = SOCK_STREAM;
1617 snprintf(strport, sizeof strport, "%d", host_port);
1618 if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) {
1619 error("%.100s: unknown host (%s)", host, gai_strerror(gaierr));
Damien Millerb38eff82000-04-01 11:09:21 +10001620 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001621 }
Damien Miller34132e52000-01-14 15:45:46 +11001622 for (ai = aitop; ai; ai = ai->ai_next) {
1623 if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
1624 continue;
1625 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop),
1626 strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
Damien Millerb38eff82000-04-01 11:09:21 +10001627 error("channel_connect_to: getnameinfo failed");
Damien Miller34132e52000-01-14 15:45:46 +11001628 continue;
1629 }
1630 /* Create the socket. */
1631 sock = socket(ai->ai_family, SOCK_STREAM, 0);
1632 if (sock < 0) {
1633 error("socket: %.100s", strerror(errno));
1634 continue;
1635 }
1636 /* Connect to the host/port. */
1637 if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
1638 error("connect %.100s port %s: %.100s", ntop, strport,
1639 strerror(errno));
1640 close(sock);
1641 continue; /* fail -- try next */
1642 }
1643 break; /* success */
1644
1645 }
1646 freeaddrinfo(aitop);
Damien Miller34132e52000-01-14 15:45:46 +11001647 if (!ai) {
1648 error("connect %.100s port %d: failed.", host, host_port);
Damien Millerb38eff82000-04-01 11:09:21 +10001649 return -1;
1650 }
1651 /* success */
1652 return sock;
1653}
1654
1655/*
1656 * This is called after receiving PORT_OPEN message. This attempts to
1657 * connect to the given host:port, and sends back CHANNEL_OPEN_CONFIRMATION
1658 * or CHANNEL_OPEN_FAILURE.
1659 */
1660
Damien Miller4af51302000-04-16 11:18:38 +10001661void
Damien Miller62cee002000-09-23 17:15:56 +11001662channel_input_port_open(int type, int plen, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10001663{
1664 u_short host_port;
1665 char *host, *originator_string;
1666 int remote_channel, sock = -1, newch, i, denied;
1667 unsigned int host_len, originator_len;
1668
1669 /* Get remote channel number. */
1670 remote_channel = packet_get_int();
1671
1672 /* Get host name to connect to. */
1673 host = packet_get_string(&host_len);
1674
1675 /* Get port to connect to. */
1676 host_port = packet_get_int();
1677
1678 /* Get remote originator name. */
1679 if (have_hostname_in_open) {
1680 originator_string = packet_get_string(&originator_len);
1681 originator_len += 4; /* size of packet_int */
1682 } else {
1683 originator_string = xstrdup("unknown (remote did not supply name)");
1684 originator_len = 0; /* no originator supplied */
Damien Miller95def091999-11-25 00:26:21 +11001685 }
Damien Miller34132e52000-01-14 15:45:46 +11001686
Damien Millerb38eff82000-04-01 11:09:21 +10001687 packet_integrity_check(plen,
1688 4 + 4 + host_len + 4 + originator_len, SSH_MSG_PORT_OPEN);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001689
Damien Millerb38eff82000-04-01 11:09:21 +10001690 /* Check if opening that port is permitted. */
1691 denied = 0;
1692 if (!all_opens_permitted) {
1693 /* Go trough all permitted ports. */
1694 for (i = 0; i < num_permitted_opens; i++)
1695 if (permitted_opens[i].port_to_connect == host_port &&
1696 strcmp(permitted_opens[i].host_to_connect, host) == 0)
1697 break;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001698
Damien Millerb38eff82000-04-01 11:09:21 +10001699 /* Check if we found the requested port among those permitted. */
1700 if (i >= num_permitted_opens) {
1701 /* The port is not permitted. */
1702 log("Received request to connect to %.100s:%d, but the request was denied.",
1703 host, host_port);
1704 denied = 1;
1705 }
1706 }
1707 sock = denied ? -1 : channel_connect_to(host, host_port);
1708 if (sock > 0) {
1709 /* Allocate a channel for this connection. */
1710 newch = channel_allocate(SSH_CHANNEL_OPEN, sock, originator_string);
1711 channels[newch].remote_id = remote_channel;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001712
Damien Millerb38eff82000-04-01 11:09:21 +10001713 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1714 packet_put_int(remote_channel);
1715 packet_put_int(newch);
1716 packet_send();
1717 } else {
1718 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1719 packet_put_int(remote_channel);
1720 packet_send();
1721 }
Damien Miller95def091999-11-25 00:26:21 +11001722 xfree(host);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001723}
1724
Damien Miller5428f641999-11-25 11:54:57 +11001725/*
1726 * Creates an internet domain socket for listening for X11 connections.
1727 * Returns a suitable value for the DISPLAY variable, or NULL if an error
1728 * occurs.
1729 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001730
Damien Miller34132e52000-01-14 15:45:46 +11001731#define NUM_SOCKS 10
1732
Damien Miller95def091999-11-25 00:26:21 +11001733char *
Damien Millera34a28b1999-12-14 10:47:15 +11001734x11_create_display_inet(int screen_number, int x11_display_offset)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001735{
Damien Milleraae6c611999-12-06 11:47:28 +11001736 int display_number, sock;
1737 u_short port;
Damien Miller34132e52000-01-14 15:45:46 +11001738 struct addrinfo hints, *ai, *aitop;
1739 char strport[NI_MAXSERV];
1740 int gaierr, n, num_socks = 0, socks[NUM_SOCKS];
1741 char display[512];
Damien Miller95def091999-11-25 00:26:21 +11001742 char hostname[MAXHOSTNAMELEN];
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001743
Damien Millera34a28b1999-12-14 10:47:15 +11001744 for (display_number = x11_display_offset;
Damien Miller95def091999-11-25 00:26:21 +11001745 display_number < MAX_DISPLAYS;
1746 display_number++) {
1747 port = 6000 + display_number;
Damien Miller34132e52000-01-14 15:45:46 +11001748 memset(&hints, 0, sizeof(hints));
1749 hints.ai_family = IPv4or6;
1750 hints.ai_flags = AI_PASSIVE; /* XXX loopback only ? */
1751 hints.ai_socktype = SOCK_STREAM;
1752 snprintf(strport, sizeof strport, "%d", port);
1753 if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) {
1754 error("getaddrinfo: %.100s", gai_strerror(gaierr));
Damien Miller95def091999-11-25 00:26:21 +11001755 return NULL;
1756 }
Damien Miller34132e52000-01-14 15:45:46 +11001757 for (ai = aitop; ai; ai = ai->ai_next) {
1758 if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
1759 continue;
1760 sock = socket(ai->ai_family, SOCK_STREAM, 0);
1761 if (sock < 0) {
Damien Miller89d97962000-10-14 12:37:19 +11001762 if ((errno != EINVAL) && (errno != EAFNOSUPPORT)) {
Damien Millere2192732000-01-17 13:22:55 +11001763 error("socket: %.100s", strerror(errno));
1764 return NULL;
1765 } else {
Damien Millercb5e44a2000-09-29 12:12:36 +11001766 debug("x11_create_display_inet: Socket family %d not supported",
1767 ai->ai_family);
Damien Millere2192732000-01-17 13:22:55 +11001768 continue;
1769 }
Damien Miller34132e52000-01-14 15:45:46 +11001770 }
1771 if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
1772 debug("bind port %d: %.100s", port, strerror(errno));
1773 shutdown(sock, SHUT_RDWR);
1774 close(sock);
Damien Miller3c7eeb22000-03-03 22:35:33 +11001775
1776 if (ai->ai_next)
1777 continue;
1778
Damien Miller34132e52000-01-14 15:45:46 +11001779 for (n = 0; n < num_socks; n++) {
1780 shutdown(socks[n], SHUT_RDWR);
1781 close(socks[n]);
1782 }
1783 num_socks = 0;
1784 break;
1785 }
1786 socks[num_socks++] = sock;
Damien Miller7bcb0892000-03-11 20:45:40 +11001787#ifndef DONT_TRY_OTHER_AF
Damien Miller34132e52000-01-14 15:45:46 +11001788 if (num_socks == NUM_SOCKS)
1789 break;
Damien Miller7bcb0892000-03-11 20:45:40 +11001790#else
1791 break;
1792#endif
Damien Miller95def091999-11-25 00:26:21 +11001793 }
Damien Miller34132e52000-01-14 15:45:46 +11001794 if (num_socks > 0)
1795 break;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001796 }
Damien Miller95def091999-11-25 00:26:21 +11001797 if (display_number >= MAX_DISPLAYS) {
1798 error("Failed to allocate internet-domain X11 display socket.");
1799 return NULL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001800 }
Damien Miller95def091999-11-25 00:26:21 +11001801 /* Start listening for connections on the socket. */
Damien Miller34132e52000-01-14 15:45:46 +11001802 for (n = 0; n < num_socks; n++) {
1803 sock = socks[n];
1804 if (listen(sock, 5) < 0) {
1805 error("listen: %.100s", strerror(errno));
1806 shutdown(sock, SHUT_RDWR);
1807 close(sock);
1808 return NULL;
1809 }
Damien Miller95def091999-11-25 00:26:21 +11001810 }
Damien Miller34132e52000-01-14 15:45:46 +11001811
Damien Miller95def091999-11-25 00:26:21 +11001812 /* Set up a suitable value for the DISPLAY variable. */
Damien Miller76112de1999-12-21 11:18:08 +11001813
Damien Miller95def091999-11-25 00:26:21 +11001814 if (gethostname(hostname, sizeof(hostname)) < 0)
1815 fatal("gethostname: %.100s", strerror(errno));
Damien Miller76112de1999-12-21 11:18:08 +11001816
1817#ifdef IPADDR_IN_DISPLAY
1818 /*
1819 * HPUX detects the local hostname in the DISPLAY variable and tries
1820 * to set up a shared memory connection to the server, which it
1821 * incorrectly supposes to be local.
1822 *
1823 * The workaround - as used in later $$H and other programs - is
1824 * is to set display to the host's IP address.
1825 */
1826 {
1827 struct hostent *he;
1828 struct in_addr my_addr;
1829
1830 he = gethostbyname(hostname);
1831 if (he == NULL) {
1832 error("[X11-broken-fwd-hostname-workaround] Could not get "
1833 "IP address for hostname %s.", hostname);
1834
1835 packet_send_debug("[X11-broken-fwd-hostname-workaround]"
1836 "Could not get IP address for hostname %s.", hostname);
1837
1838 shutdown(sock, SHUT_RDWR);
1839 close(sock);
1840
1841 return NULL;
1842 }
1843
1844 memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr));
1845
1846 /* Set DISPLAY to <ip address>:screen.display */
Damien Miller34132e52000-01-14 15:45:46 +11001847 snprintf(display, sizeof(display), "%.50s:%d.%d", inet_ntoa(my_addr),
Damien Miller76112de1999-12-21 11:18:08 +11001848 display_number, screen_number);
1849 }
1850#else /* IPADDR_IN_DISPLAY */
1851 /* Just set DISPLAY to hostname:screen.display */
Damien Miller34132e52000-01-14 15:45:46 +11001852 snprintf(display, sizeof display, "%.400s:%d.%d", hostname,
Damien Miller76112de1999-12-21 11:18:08 +11001853 display_number, screen_number);
1854#endif /* IPADDR_IN_DISPLAY */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001855
Damien Miller34132e52000-01-14 15:45:46 +11001856 /* Allocate a channel for each socket. */
1857 for (n = 0; n < num_socks; n++) {
1858 sock = socks[n];
Damien Millerbd483e72000-04-30 10:00:53 +10001859 (void) channel_new("x11 listener",
1860 SSH_CHANNEL_X11_LISTENER, sock, sock, -1,
1861 CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
1862 0, xstrdup("X11 inet listener"));
Damien Miller34132e52000-01-14 15:45:46 +11001863 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001864
Damien Miller95def091999-11-25 00:26:21 +11001865 /* Return a suitable value for the DISPLAY environment variable. */
Damien Miller34132e52000-01-14 15:45:46 +11001866 return xstrdup(display);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001867}
1868
1869#ifndef X_UNIX_PATH
1870#define X_UNIX_PATH "/tmp/.X11-unix/X"
1871#endif
1872
1873static
1874int
Damien Miller81b25cf1999-12-07 16:47:28 +11001875connect_local_xsocket(unsigned int dnr)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001876{
Damien Miller95def091999-11-25 00:26:21 +11001877 static const char *const x_sockets[] = {
1878 X_UNIX_PATH "%u",
1879 "/var/X/.X11-unix/X" "%u",
1880 "/usr/spool/sockets/X11/" "%u",
1881 NULL
1882 };
1883 int sock;
1884 struct sockaddr_un addr;
1885 const char *const * path;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001886
Damien Miller95def091999-11-25 00:26:21 +11001887 for (path = x_sockets; *path; ++path) {
1888 sock = socket(AF_UNIX, SOCK_STREAM, 0);
1889 if (sock < 0)
1890 error("socket: %.100s", strerror(errno));
1891 memset(&addr, 0, sizeof(addr));
1892 addr.sun_family = AF_UNIX;
1893 snprintf(addr.sun_path, sizeof addr.sun_path, *path, dnr);
1894 if (connect(sock, (struct sockaddr *) & addr, sizeof(addr)) == 0)
1895 return sock;
1896 close(sock);
1897 }
1898 error("connect %.100s: %.100s", addr.sun_path, strerror(errno));
1899 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001900}
1901
Damien Millerbd483e72000-04-30 10:00:53 +10001902int
1903x11_connect_display(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001904{
Damien Millerbd483e72000-04-30 10:00:53 +10001905 int display_number, sock = 0;
Damien Miller95def091999-11-25 00:26:21 +11001906 const char *display;
Damien Millerbd483e72000-04-30 10:00:53 +10001907 char buf[1024], *cp;
Damien Miller34132e52000-01-14 15:45:46 +11001908 struct addrinfo hints, *ai, *aitop;
1909 char strport[NI_MAXSERV];
1910 int gaierr;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001911
Damien Miller95def091999-11-25 00:26:21 +11001912 /* Try to open a socket for the local X server. */
1913 display = getenv("DISPLAY");
1914 if (!display) {
1915 error("DISPLAY not set.");
Damien Millerbd483e72000-04-30 10:00:53 +10001916 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001917 }
Damien Miller5428f641999-11-25 11:54:57 +11001918 /*
1919 * Now we decode the value of the DISPLAY variable and make a
1920 * connection to the real X server.
1921 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001922
Damien Miller5428f641999-11-25 11:54:57 +11001923 /*
1924 * Check if it is a unix domain socket. Unix domain displays are in
1925 * one of the following formats: unix:d[.s], :d[.s], ::d[.s]
1926 */
Damien Miller95def091999-11-25 00:26:21 +11001927 if (strncmp(display, "unix:", 5) == 0 ||
1928 display[0] == ':') {
1929 /* Connect to the unix domain socket. */
1930 if (sscanf(strrchr(display, ':') + 1, "%d", &display_number) != 1) {
1931 error("Could not parse display number from DISPLAY: %.100s",
1932 display);
Damien Millerbd483e72000-04-30 10:00:53 +10001933 return -1;
Damien Miller95def091999-11-25 00:26:21 +11001934 }
1935 /* Create a socket. */
1936 sock = connect_local_xsocket(display_number);
1937 if (sock < 0)
Damien Millerbd483e72000-04-30 10:00:53 +10001938 return -1;
Damien Miller95def091999-11-25 00:26:21 +11001939
1940 /* OK, we now have a connection to the display. */
Damien Millerbd483e72000-04-30 10:00:53 +10001941 return sock;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001942 }
Damien Miller5428f641999-11-25 11:54:57 +11001943 /*
1944 * Connect to an inet socket. The DISPLAY value is supposedly
1945 * hostname:d[.s], where hostname may also be numeric IP address.
1946 */
Damien Miller95def091999-11-25 00:26:21 +11001947 strncpy(buf, display, sizeof(buf));
1948 buf[sizeof(buf) - 1] = 0;
1949 cp = strchr(buf, ':');
1950 if (!cp) {
1951 error("Could not find ':' in DISPLAY: %.100s", display);
Damien Millerbd483e72000-04-30 10:00:53 +10001952 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001953 }
Damien Miller95def091999-11-25 00:26:21 +11001954 *cp = 0;
Damien Miller5428f641999-11-25 11:54:57 +11001955 /* buf now contains the host name. But first we parse the display number. */
Damien Miller95def091999-11-25 00:26:21 +11001956 if (sscanf(cp + 1, "%d", &display_number) != 1) {
1957 error("Could not parse display number from DISPLAY: %.100s",
1958 display);
Damien Millerbd483e72000-04-30 10:00:53 +10001959 return -1;
Damien Miller95def091999-11-25 00:26:21 +11001960 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001961
Damien Miller34132e52000-01-14 15:45:46 +11001962 /* Look up the host address */
1963 memset(&hints, 0, sizeof(hints));
1964 hints.ai_family = IPv4or6;
1965 hints.ai_socktype = SOCK_STREAM;
1966 snprintf(strport, sizeof strport, "%d", 6000 + display_number);
1967 if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) {
1968 error("%.100s: unknown host. (%s)", buf, gai_strerror(gaierr));
Damien Millerbd483e72000-04-30 10:00:53 +10001969 return -1;
Damien Miller95def091999-11-25 00:26:21 +11001970 }
Damien Miller34132e52000-01-14 15:45:46 +11001971 for (ai = aitop; ai; ai = ai->ai_next) {
1972 /* Create a socket. */
1973 sock = socket(ai->ai_family, SOCK_STREAM, 0);
1974 if (sock < 0) {
1975 debug("socket: %.100s", strerror(errno));
Damien Millerb38eff82000-04-01 11:09:21 +10001976 continue;
1977 }
1978 /* Connect it to the display. */
1979 if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
1980 debug("connect %.100s port %d: %.100s", buf,
1981 6000 + display_number, strerror(errno));
1982 close(sock);
1983 continue;
1984 }
1985 /* Success */
1986 break;
Damien Miller34132e52000-01-14 15:45:46 +11001987 }
Damien Miller34132e52000-01-14 15:45:46 +11001988 freeaddrinfo(aitop);
1989 if (!ai) {
Damien Miller4af51302000-04-16 11:18:38 +10001990 error("connect %.100s port %d: %.100s", buf, 6000 + display_number,
Damien Miller34132e52000-01-14 15:45:46 +11001991 strerror(errno));
Damien Millerbd483e72000-04-30 10:00:53 +10001992 return -1;
Damien Miller95def091999-11-25 00:26:21 +11001993 }
Damien Millerbd483e72000-04-30 10:00:53 +10001994 return sock;
1995}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001996
Damien Millerbd483e72000-04-30 10:00:53 +10001997/*
1998 * This is called when SSH_SMSG_X11_OPEN is received. The packet contains
1999 * the remote channel number. We should do whatever we want, and respond
2000 * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE.
2001 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002002
Damien Millerbd483e72000-04-30 10:00:53 +10002003void
Damien Miller62cee002000-09-23 17:15:56 +11002004x11_input_open(int type, int plen, void *ctxt)
Damien Millerbd483e72000-04-30 10:00:53 +10002005{
2006 int remote_channel, sock = 0, newch;
2007 char *remote_host;
2008 unsigned int remote_len;
Damien Miller95def091999-11-25 00:26:21 +11002009
Damien Millerbd483e72000-04-30 10:00:53 +10002010 /* Get remote channel number. */
2011 remote_channel = packet_get_int();
Damien Miller95def091999-11-25 00:26:21 +11002012
Damien Millerbd483e72000-04-30 10:00:53 +10002013 /* Get remote originator name. */
2014 if (have_hostname_in_open) {
2015 remote_host = packet_get_string(&remote_len);
2016 remote_len += 4;
2017 } else {
2018 remote_host = xstrdup("unknown (remote did not supply name)");
2019 remote_len = 0;
2020 }
2021
2022 debug("Received X11 open request.");
2023 packet_integrity_check(plen, 4 + remote_len, SSH_SMSG_X11_OPEN);
2024
2025 /* Obtain a connection to the real X display. */
2026 sock = x11_connect_display();
2027 if (sock == -1) {
2028 /* Send refusal to the remote host. */
2029 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
2030 packet_put_int(remote_channel);
2031 packet_send();
2032 } else {
2033 /* Allocate a channel for this connection. */
2034 newch = channel_allocate(
2035 (x11_saved_proto == NULL) ?
2036 SSH_CHANNEL_OPEN : SSH_CHANNEL_X11_OPEN,
2037 sock, remote_host);
2038 channels[newch].remote_id = remote_channel;
2039
2040 /* Send a confirmation to the remote host. */
2041 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
2042 packet_put_int(remote_channel);
2043 packet_put_int(newch);
2044 packet_send();
2045 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002046}
2047
Damien Miller5428f641999-11-25 11:54:57 +11002048/*
2049 * Requests forwarding of X11 connections, generates fake authentication
2050 * data, and enables authentication spoofing.
2051 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002052
Damien Miller4af51302000-04-16 11:18:38 +10002053void
Damien Millerbd483e72000-04-30 10:00:53 +10002054x11_request_forwarding_with_spoofing(int client_session_id,
2055 const char *proto, const char *data)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002056{
Damien Miller95def091999-11-25 00:26:21 +11002057 unsigned int data_len = (unsigned int) strlen(data) / 2;
2058 unsigned int i, value;
2059 char *new_data;
2060 int screen_number;
2061 const char *cp;
2062 u_int32_t rand = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002063
Damien Miller95def091999-11-25 00:26:21 +11002064 cp = getenv("DISPLAY");
2065 if (cp)
2066 cp = strchr(cp, ':');
2067 if (cp)
2068 cp = strchr(cp, '.');
2069 if (cp)
2070 screen_number = atoi(cp + 1);
2071 else
2072 screen_number = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002073
Damien Miller95def091999-11-25 00:26:21 +11002074 /* Save protocol name. */
2075 x11_saved_proto = xstrdup(proto);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002076
Damien Miller5428f641999-11-25 11:54:57 +11002077 /*
2078 * Extract real authentication data and generate fake data of the
2079 * same length.
2080 */
Damien Miller95def091999-11-25 00:26:21 +11002081 x11_saved_data = xmalloc(data_len);
2082 x11_fake_data = xmalloc(data_len);
2083 for (i = 0; i < data_len; i++) {
2084 if (sscanf(data + 2 * i, "%2x", &value) != 1)
2085 fatal("x11_request_forwarding: bad authentication data: %.100s", data);
2086 if (i % 4 == 0)
2087 rand = arc4random();
2088 x11_saved_data[i] = value;
2089 x11_fake_data[i] = rand & 0xff;
2090 rand >>= 8;
2091 }
2092 x11_saved_data_len = data_len;
2093 x11_fake_data_len = data_len;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002094
Damien Miller95def091999-11-25 00:26:21 +11002095 /* Convert the fake data into hex. */
2096 new_data = xmalloc(2 * data_len + 1);
2097 for (i = 0; i < data_len; i++)
2098 sprintf(new_data + 2 * i, "%02x", (unsigned char) x11_fake_data[i]);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002099
Damien Miller95def091999-11-25 00:26:21 +11002100 /* Send the request packet. */
Damien Millerbd483e72000-04-30 10:00:53 +10002101 if (compat20) {
2102 channel_request_start(client_session_id, "x11-req", 0);
2103 packet_put_char(0); /* XXX bool single connection */
2104 } else {
2105 packet_start(SSH_CMSG_X11_REQUEST_FORWARDING);
2106 }
2107 packet_put_cstring(proto);
2108 packet_put_cstring(new_data);
Damien Miller95def091999-11-25 00:26:21 +11002109 packet_put_int(screen_number);
2110 packet_send();
2111 packet_write_wait();
2112 xfree(new_data);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002113}
2114
2115/* Sends a message to the server to request authentication fd forwarding. */
2116
Damien Miller4af51302000-04-16 11:18:38 +10002117void
Damien Miller95def091999-11-25 00:26:21 +11002118auth_request_forwarding()
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002119{
Damien Miller95def091999-11-25 00:26:21 +11002120 packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING);
2121 packet_send();
2122 packet_write_wait();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002123}
2124
Damien Miller5428f641999-11-25 11:54:57 +11002125/*
2126 * Returns the name of the forwarded authentication socket. Returns NULL if
2127 * there is no forwarded authentication socket. The returned value points to
2128 * a static buffer.
2129 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002130
Damien Miller95def091999-11-25 00:26:21 +11002131char *
2132auth_get_socket_name()
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002133{
Damien Miller95def091999-11-25 00:26:21 +11002134 return channel_forwarded_auth_socket_name;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002135}
2136
2137/* removes the agent forwarding socket */
2138
Damien Miller4af51302000-04-16 11:18:38 +10002139void
Damien Miller95def091999-11-25 00:26:21 +11002140cleanup_socket(void)
2141{
Damien Miller78315eb2000-09-29 23:01:36 +11002142 unlink(channel_forwarded_auth_socket_name);
Damien Miller95def091999-11-25 00:26:21 +11002143 rmdir(channel_forwarded_auth_socket_dir);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002144}
2145
Damien Miller5428f641999-11-25 11:54:57 +11002146/*
Damien Millerd3a18572000-06-07 19:55:44 +10002147 * This is called to process SSH_CMSG_AGENT_REQUEST_FORWARDING on the server.
Damien Miller5428f641999-11-25 11:54:57 +11002148 * This starts forwarding authentication requests.
2149 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002150
Damien Millerd3a18572000-06-07 19:55:44 +10002151int
Damien Miller95def091999-11-25 00:26:21 +11002152auth_input_request_forwarding(struct passwd * pw)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002153{
Damien Miller95def091999-11-25 00:26:21 +11002154 int sock, newch;
2155 struct sockaddr_un sunaddr;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002156
Damien Miller95def091999-11-25 00:26:21 +11002157 if (auth_get_socket_name() != NULL)
2158 fatal("Protocol error: authentication forwarding requested twice.");
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002159
Damien Miller95def091999-11-25 00:26:21 +11002160 /* Temporarily drop privileged uid for mkdir/bind. */
2161 temporarily_use_uid(pw->pw_uid);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002162
Damien Miller95def091999-11-25 00:26:21 +11002163 /* Allocate a buffer for the socket name, and format the name. */
2164 channel_forwarded_auth_socket_name = xmalloc(MAX_SOCKET_NAME);
2165 channel_forwarded_auth_socket_dir = xmalloc(MAX_SOCKET_NAME);
2166 strlcpy(channel_forwarded_auth_socket_dir, "/tmp/ssh-XXXXXXXX", MAX_SOCKET_NAME);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002167
Damien Miller95def091999-11-25 00:26:21 +11002168 /* Create private directory for socket */
Damien Millerd3a18572000-06-07 19:55:44 +10002169 if (mkdtemp(channel_forwarded_auth_socket_dir) == NULL) {
2170 packet_send_debug("Agent forwarding disabled: mkdtemp() failed: %.100s",
2171 strerror(errno));
2172 restore_uid();
2173 xfree(channel_forwarded_auth_socket_name);
2174 xfree(channel_forwarded_auth_socket_dir);
2175 channel_forwarded_auth_socket_name = NULL;
2176 channel_forwarded_auth_socket_dir = NULL;
2177 return 0;
2178 }
Damien Miller95def091999-11-25 00:26:21 +11002179 snprintf(channel_forwarded_auth_socket_name, MAX_SOCKET_NAME, "%s/agent.%d",
2180 channel_forwarded_auth_socket_dir, (int) getpid());
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002181
Damien Miller95def091999-11-25 00:26:21 +11002182 if (atexit(cleanup_socket) < 0) {
2183 int saved = errno;
2184 cleanup_socket();
2185 packet_disconnect("socket: %.100s", strerror(saved));
2186 }
2187 /* Create the socket. */
2188 sock = socket(AF_UNIX, SOCK_STREAM, 0);
2189 if (sock < 0)
2190 packet_disconnect("socket: %.100s", strerror(errno));
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002191
Damien Miller95def091999-11-25 00:26:21 +11002192 /* Bind it to the name. */
2193 memset(&sunaddr, 0, sizeof(sunaddr));
2194 sunaddr.sun_family = AF_UNIX;
2195 strncpy(sunaddr.sun_path, channel_forwarded_auth_socket_name,
2196 sizeof(sunaddr.sun_path));
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002197
Damien Miller95def091999-11-25 00:26:21 +11002198 if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0)
2199 packet_disconnect("bind: %.100s", strerror(errno));
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002200
Damien Miller95def091999-11-25 00:26:21 +11002201 /* Restore the privileged uid. */
2202 restore_uid();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002203
Damien Miller95def091999-11-25 00:26:21 +11002204 /* Start listening on the socket. */
2205 if (listen(sock, 5) < 0)
2206 packet_disconnect("listen: %.100s", strerror(errno));
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002207
Damien Miller95def091999-11-25 00:26:21 +11002208 /* Allocate a channel for the authentication agent socket. */
2209 newch = channel_allocate(SSH_CHANNEL_AUTH_SOCKET, sock,
2210 xstrdup("auth socket"));
Damien Miller037a0dc1999-12-07 15:38:31 +11002211 strlcpy(channels[newch].path, channel_forwarded_auth_socket_name,
2212 sizeof(channels[newch].path));
Damien Millerd3a18572000-06-07 19:55:44 +10002213 return 1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002214}
2215
2216/* This is called to process an SSH_SMSG_AGENT_OPEN message. */
2217
Damien Miller4af51302000-04-16 11:18:38 +10002218void
Damien Miller62cee002000-09-23 17:15:56 +11002219auth_input_open_request(int type, int plen, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002220{
Damien Miller95def091999-11-25 00:26:21 +11002221 int remch, sock, newch;
2222 char *dummyname;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002223
Damien Millerb38eff82000-04-01 11:09:21 +10002224 packet_integrity_check(plen, 4, type);
2225
Damien Miller95def091999-11-25 00:26:21 +11002226 /* Read the remote channel number from the message. */
2227 remch = packet_get_int();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002228
Damien Miller5428f641999-11-25 11:54:57 +11002229 /*
2230 * Get a connection to the local authentication agent (this may again
2231 * get forwarded).
2232 */
Damien Miller95def091999-11-25 00:26:21 +11002233 sock = ssh_get_authentication_socket();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002234
Damien Miller5428f641999-11-25 11:54:57 +11002235 /*
2236 * If we could not connect the agent, send an error message back to
2237 * the server. This should never happen unless the agent dies,
2238 * because authentication forwarding is only enabled if we have an
2239 * agent.
2240 */
Damien Miller95def091999-11-25 00:26:21 +11002241 if (sock < 0) {
2242 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
2243 packet_put_int(remch);
2244 packet_send();
2245 return;
2246 }
2247 debug("Forwarding authentication connection.");
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002248
Damien Miller5428f641999-11-25 11:54:57 +11002249 /*
2250 * Dummy host name. This will be freed when the channel is freed; it
2251 * will still be valid in the packet_put_string below since the
2252 * channel cannot yet be freed at that point.
2253 */
Damien Miller95def091999-11-25 00:26:21 +11002254 dummyname = xstrdup("authentication agent connection");
2255
2256 newch = channel_allocate(SSH_CHANNEL_OPEN, sock, dummyname);
2257 channels[newch].remote_id = remch;
2258
2259 /* Send a confirmation to the remote host. */
2260 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
2261 packet_put_int(remch);
2262 packet_put_int(newch);
2263 packet_send();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002264}
Damien Miller33b13562000-04-04 14:38:59 +10002265
2266void
Damien Millerbd483e72000-04-30 10:00:53 +10002267channel_start_open(int id)
Damien Miller33b13562000-04-04 14:38:59 +10002268{
2269 Channel *c = channel_lookup(id);
2270 if (c == NULL) {
2271 log("channel_open: %d: bad id", id);
2272 return;
2273 }
Damien Millerbd483e72000-04-30 10:00:53 +10002274 debug("send channel open %d", id);
Damien Miller33b13562000-04-04 14:38:59 +10002275 packet_start(SSH2_MSG_CHANNEL_OPEN);
2276 packet_put_cstring(c->ctype);
2277 packet_put_int(c->self);
2278 packet_put_int(c->local_window);
2279 packet_put_int(c->local_maxpacket);
Damien Millerbd483e72000-04-30 10:00:53 +10002280}
2281void
2282channel_open(int id)
2283{
2284 /* XXX REMOVE ME */
2285 channel_start_open(id);
Damien Miller33b13562000-04-04 14:38:59 +10002286 packet_send();
Damien Miller33b13562000-04-04 14:38:59 +10002287}
2288void
2289channel_request(int id, char *service, int wantconfirm)
2290{
2291 channel_request_start(id, service, wantconfirm);
2292 packet_send();
2293 debug("channel request %d: %s", id, service) ;
2294}
2295void
2296channel_request_start(int id, char *service, int wantconfirm)
2297{
2298 Channel *c = channel_lookup(id);
2299 if (c == NULL) {
2300 log("channel_request: %d: bad id", id);
2301 return;
2302 }
2303 packet_start(SSH2_MSG_CHANNEL_REQUEST);
2304 packet_put_int(c->remote_id);
2305 packet_put_cstring(service);
2306 packet_put_char(wantconfirm);
2307}
2308void
2309channel_register_callback(int id, int mtype, channel_callback_fn *fn, void *arg)
2310{
2311 Channel *c = channel_lookup(id);
2312 if (c == NULL) {
2313 log("channel_register_callback: %d: bad id", id);
2314 return;
2315 }
2316 c->cb_event = mtype;
2317 c->cb_fn = fn;
2318 c->cb_arg = arg;
2319}
2320void
2321channel_register_cleanup(int id, channel_callback_fn *fn)
2322{
2323 Channel *c = channel_lookup(id);
2324 if (c == NULL) {
2325 log("channel_register_cleanup: %d: bad id", id);
2326 return;
2327 }
2328 c->dettach_user = fn;
2329}
2330void
2331channel_cancel_cleanup(int id)
2332{
2333 Channel *c = channel_lookup(id);
2334 if (c == NULL) {
2335 log("channel_cancel_cleanup: %d: bad id", id);
2336 return;
2337 }
2338 c->dettach_user = NULL;
2339}
Damien Millerad833b32000-08-23 10:46:23 +10002340void
2341channel_register_filter(int id, channel_filter_fn *fn)
2342{
2343 Channel *c = channel_lookup(id);
2344 if (c == NULL) {
2345 log("channel_register_filter: %d: bad id", id);
2346 return;
2347 }
2348 c->input_filter = fn;
2349}
Damien Miller33b13562000-04-04 14:38:59 +10002350
2351void
2352channel_set_fds(int id, int rfd, int wfd, int efd, int extusage)
2353{
2354 Channel *c = channel_lookup(id);
2355 if (c == NULL || c->type != SSH_CHANNEL_LARVAL)
2356 fatal("channel_activate for non-larval channel %d.", id);
Damien Miller6f83b8e2000-05-02 09:23:45 +10002357
2358 channel_register_fds(c, rfd, wfd, efd, extusage);
Damien Miller33b13562000-04-04 14:38:59 +10002359 c->type = SSH_CHANNEL_OPEN;
Damien Miller33b13562000-04-04 14:38:59 +10002360 /* XXX window size? */
Damien Millere4340be2000-09-16 13:29:08 +11002361 c->local_window = c->local_window_max = c->local_maxpacket * 2;
Damien Miller33b13562000-04-04 14:38:59 +10002362 packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
2363 packet_put_int(c->remote_id);
2364 packet_put_int(c->local_window);
2365 packet_send();
2366}