blob: d34411e18787d56ca764702680334a41a12c7201 [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 *
Damien Miller33b13562000-04-04 14:38:59 +100015 * SSH2 support added by Markus Friedl.
Damien Millera90fc082002-01-22 23:19:38 +110016 * Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved.
Damien Millere4340be2000-09-16 13:29:08 +110017 * Copyright (c) 1999 Dug Song. All rights reserved.
18 * Copyright (c) 1999 Theo de Raadt. All rights reserved.
19 *
20 * Redistribution and use in source and binary forms, with or without
21 * modification, are permitted provided that the following conditions
22 * are met:
23 * 1. Redistributions of source code must retain the above copyright
24 * notice, this list of conditions and the following disclaimer.
25 * 2. Redistributions in binary form must reproduce the above copyright
26 * notice, this list of conditions and the following disclaimer in the
27 * documentation and/or other materials provided with the distribution.
28 *
29 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
30 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
31 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
32 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
33 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
34 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
38 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Damien Miller95def091999-11-25 00:26:21 +110039 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100040
41#include "includes.h"
Ben Lindstrom8bb6f362002-06-11 15:59:02 +000042RCSID("$OpenBSD: channels.c,v 1.175 2002/06/10 22:28:41 markus Exp $");
Damien Millerd4a8b7e1999-10-27 13:42:43 +100043
44#include "ssh.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000045#include "ssh1.h"
46#include "ssh2.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100047#include "packet.h"
48#include "xmalloc.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000049#include "log.h"
50#include "misc.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100051#include "channels.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100052#include "compat.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000053#include "canohost.h"
Damien Miller994cf142000-07-21 10:19:44 +100054#include "key.h"
55#include "authfd.h"
Damien Miller3afe3752001-12-21 12:39:51 +110056#include "pathnames.h"
Damien Miller994cf142000-07-21 10:19:44 +100057
Damien Millerd4a8b7e1999-10-27 13:42:43 +100058
Ben Lindstrome9c99912001-06-09 00:41:05 +000059/* -- channel core */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100060
Damien Miller5428f641999-11-25 11:54:57 +110061/*
62 * Pointer to an array containing all allocated channels. The array is
63 * dynamically extended as needed.
64 */
Ben Lindstrom99c73b32001-05-05 04:09:47 +000065static Channel **channels = NULL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100066
Damien Miller5428f641999-11-25 11:54:57 +110067/*
68 * Size of the channel array. All slots of the array must always be
Ben Lindstrom99c73b32001-05-05 04:09:47 +000069 * initialized (at least the type field); unused slots set to NULL
Damien Miller5428f641999-11-25 11:54:57 +110070 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100071static int channels_alloc = 0;
72
Damien Miller5428f641999-11-25 11:54:57 +110073/*
74 * Maximum file descriptor value used in any of the channels. This is
Ben Lindstrom99c73b32001-05-05 04:09:47 +000075 * updated in channel_new.
Damien Miller5428f641999-11-25 11:54:57 +110076 */
Damien Miller5e953212001-01-30 09:14:00 +110077static int channel_max_fd = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100078
Damien Millerd4a8b7e1999-10-27 13:42:43 +100079
Ben Lindstrome9c99912001-06-09 00:41:05 +000080/* -- tcp forwarding */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100081
Damien Miller5428f641999-11-25 11:54:57 +110082/*
83 * Data structure for storing which hosts are permitted for forward requests.
84 * The local sides of any remote forwards are stored in this array to prevent
85 * a corrupt remote server from accessing arbitrary TCP/IP ports on our local
86 * network (which might be behind a firewall).
87 */
Damien Miller95def091999-11-25 00:26:21 +110088typedef struct {
Damien Millerb38eff82000-04-01 11:09:21 +100089 char *host_to_connect; /* Connect to 'host'. */
90 u_short port_to_connect; /* Connect to 'port'. */
91 u_short listen_port; /* Remote side should listen port number. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100092} ForwardPermission;
93
94/* List of all permitted host/port pairs to connect. */
95static ForwardPermission permitted_opens[SSH_MAX_FORWARDS_PER_DIRECTION];
Ben Lindstrome9c99912001-06-09 00:41:05 +000096
Damien Millerd4a8b7e1999-10-27 13:42:43 +100097/* Number of permitted host/port pairs in the array. */
98static int num_permitted_opens = 0;
Damien Miller5428f641999-11-25 11:54:57 +110099/*
100 * If this is true, all opens are permitted. This is the case on the server
101 * on which we have to trust the client anyway, and the user could do
102 * anything after logging in anyway.
103 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000104static int all_opens_permitted = 0;
105
Ben Lindstrome9c99912001-06-09 00:41:05 +0000106
107/* -- X11 forwarding */
108
109/* Maximum number of fake X11 displays to try. */
110#define MAX_DISPLAYS 1000
111
112/* Saved X11 authentication protocol name. */
113static char *x11_saved_proto = NULL;
114
115/* Saved X11 authentication data. This is the real data. */
116static char *x11_saved_data = NULL;
117static u_int x11_saved_data_len = 0;
118
119/*
120 * Fake X11 authentication data. This is what the server will be sending us;
121 * we should replace any occurrences of this by the real data.
122 */
123static char *x11_fake_data = NULL;
124static u_int x11_fake_data_len;
125
126
127/* -- agent forwarding */
128
129#define NUM_SOCKS 10
130
Ben Lindstrom226cfa02001-01-22 05:34:40 +0000131/* AF_UNSPEC or AF_INET or AF_INET6 */
Ben Lindstrom908afed2001-10-03 17:34:59 +0000132static int IPv4or6 = AF_UNSPEC;
Ben Lindstrom226cfa02001-01-22 05:34:40 +0000133
Ben Lindstrome9c99912001-06-09 00:41:05 +0000134/* helper */
Ben Lindstrombba81212001-06-25 05:01:22 +0000135static void port_open_helper(Channel *c, char *rtype);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000136
Ben Lindstrome9c99912001-06-09 00:41:05 +0000137/* -- channel core */
Damien Millerb38eff82000-04-01 11:09:21 +1000138
139Channel *
140channel_lookup(int id)
141{
142 Channel *c;
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000143
Ben Lindstrom79548872002-03-05 01:57:44 +0000144 if (id < 0 || id >= channels_alloc) {
Damien Millerb38eff82000-04-01 11:09:21 +1000145 log("channel_lookup: %d: bad id", id);
146 return NULL;
147 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000148 c = channels[id];
149 if (c == NULL) {
Damien Millerb38eff82000-04-01 11:09:21 +1000150 log("channel_lookup: %d: bad id: channel free", id);
151 return NULL;
152 }
153 return c;
154}
155
Damien Miller5428f641999-11-25 11:54:57 +1100156/*
Damien Millere247cc42000-05-07 12:03:14 +1000157 * Register filedescriptors for a channel, used when allocating a channel or
Damien Miller6f83b8e2000-05-02 09:23:45 +1000158 * when the channel consumer/producer is ready, e.g. shell exec'd
Damien Miller5428f641999-11-25 11:54:57 +1100159 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000160
Ben Lindstrombba81212001-06-25 05:01:22 +0000161static void
Damien Miller69b69aa2000-10-28 14:19:58 +1100162channel_register_fds(Channel *c, int rfd, int wfd, int efd,
163 int extusage, int nonblock)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000164{
Damien Miller95def091999-11-25 00:26:21 +1100165 /* Update the maximum file descriptor value. */
Damien Miller5e953212001-01-30 09:14:00 +1100166 channel_max_fd = MAX(channel_max_fd, rfd);
167 channel_max_fd = MAX(channel_max_fd, wfd);
168 channel_max_fd = MAX(channel_max_fd, efd);
169
Damien Miller5428f641999-11-25 11:54:57 +1100170 /* XXX set close-on-exec -markus */
Damien Millere247cc42000-05-07 12:03:14 +1000171
Damien Miller6f83b8e2000-05-02 09:23:45 +1000172 c->rfd = rfd;
173 c->wfd = wfd;
174 c->sock = (rfd == wfd) ? rfd : -1;
175 c->efd = efd;
176 c->extended_usage = extusage;
Damien Miller69b69aa2000-10-28 14:19:58 +1100177
Damien Miller79438cc2001-02-16 12:34:57 +1100178 /* XXX ugly hack: nonblock is only set by the server */
179 if (nonblock && isatty(c->rfd)) {
Ben Lindstromcc74df72001-03-05 06:20:14 +0000180 debug("channel %d: rfd %d isatty", c->self, c->rfd);
Damien Miller79438cc2001-02-16 12:34:57 +1100181 c->isatty = 1;
182 if (!isatty(c->wfd)) {
Ben Lindstromcc74df72001-03-05 06:20:14 +0000183 error("channel %d: wfd %d is not a tty?",
Damien Miller79438cc2001-02-16 12:34:57 +1100184 c->self, c->wfd);
185 }
186 } else {
187 c->isatty = 0;
188 }
189
Damien Miller69b69aa2000-10-28 14:19:58 +1100190 /* enable nonblocking mode */
191 if (nonblock) {
192 if (rfd != -1)
193 set_nonblock(rfd);
194 if (wfd != -1)
195 set_nonblock(wfd);
196 if (efd != -1)
197 set_nonblock(efd);
198 }
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
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000206Channel *
Damien Miller6f83b8e2000-05-02 09:23:45 +1000207channel_new(char *ctype, int type, int rfd, int wfd, int efd,
Damien Miller69b69aa2000-10-28 14:19:58 +1100208 int window, int maxpack, int extusage, char *remote_name, int nonblock)
Damien Miller6f83b8e2000-05-02 09:23:45 +1000209{
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) {
215 channels_alloc = 10;
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000216 channels = xmalloc(channels_alloc * sizeof(Channel *));
Damien Miller95def091999-11-25 00:26:21 +1100217 for (i = 0; i < channels_alloc; i++)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000218 channels[i] = NULL;
Ben Lindstrom601e4362001-06-21 03:19:23 +0000219 fatal_add_cleanup((void (*) (void *)) channel_free_all, NULL);
Damien Miller95def091999-11-25 00:26:21 +1100220 }
221 /* Try to find a free slot where to put the new channel. */
222 for (found = -1, i = 0; i < channels_alloc; i++)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000223 if (channels[i] == NULL) {
Damien Miller95def091999-11-25 00:26:21 +1100224 /* Found a free slot. */
225 found = i;
226 break;
227 }
228 if (found == -1) {
Damien Miller5428f641999-11-25 11:54:57 +1100229 /* There are no free slots. Take last+1 slot and expand the array. */
Damien Miller95def091999-11-25 00:26:21 +1100230 found = channels_alloc;
231 channels_alloc += 10;
Damien Millerd3444942000-09-30 14:20:03 +1100232 debug2("channel: expanding %d", channels_alloc);
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000233 channels = xrealloc(channels, channels_alloc * sizeof(Channel *));
Damien Miller95def091999-11-25 00:26:21 +1100234 for (i = found; i < channels_alloc; i++)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000235 channels[i] = NULL;
Damien Miller95def091999-11-25 00:26:21 +1100236 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000237 /* Initialize and return new channel. */
238 c = channels[found] = xmalloc(sizeof(Channel));
Damien Miller4623a752001-10-10 15:03:58 +1000239 memset(c, 0, sizeof(Channel));
Damien Miller95def091999-11-25 00:26:21 +1100240 buffer_init(&c->input);
241 buffer_init(&c->output);
Damien Millerb38eff82000-04-01 11:09:21 +1000242 buffer_init(&c->extended);
Damien Miller5144df92002-01-22 23:28:45 +1100243 c->ostate = CHAN_OUTPUT_OPEN;
244 c->istate = CHAN_INPUT_OPEN;
245 c->flags = 0;
Damien Miller69b69aa2000-10-28 14:19:58 +1100246 channel_register_fds(c, rfd, wfd, efd, extusage, nonblock);
Damien Miller95def091999-11-25 00:26:21 +1100247 c->self = found;
248 c->type = type;
Damien Millerb38eff82000-04-01 11:09:21 +1000249 c->ctype = ctype;
Damien Millerbd483e72000-04-30 10:00:53 +1000250 c->local_window = window;
251 c->local_window_max = window;
252 c->local_consumed = 0;
253 c->local_maxpacket = maxpack;
Damien Miller95def091999-11-25 00:26:21 +1100254 c->remote_id = -1;
255 c->remote_name = remote_name;
Damien Millerb38eff82000-04-01 11:09:21 +1000256 c->remote_window = 0;
257 c->remote_maxpacket = 0;
Ben Lindstrom944c4f02001-09-18 05:51:13 +0000258 c->force_drain = 0;
Damien Millere7378562001-12-21 14:58:35 +1100259 c->single_connection = 0;
Ben Lindstrom809744e2001-07-04 05:26:06 +0000260 c->detach_user = NULL;
Damien Miller67f0bc02002-02-05 12:23:08 +1100261 c->confirm = NULL;
Damien Millerad833b32000-08-23 10:46:23 +1000262 c->input_filter = NULL;
Damien Miller95def091999-11-25 00:26:21 +1100263 debug("channel %d: new [%s]", found, remote_name);
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000264 return c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000265}
Damien Miller6f83b8e2000-05-02 09:23:45 +1000266
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000267static int
268channel_find_maxfd(void)
269{
270 int i, max = 0;
271 Channel *c;
272
273 for (i = 0; i < channels_alloc; i++) {
274 c = channels[i];
275 if (c != NULL) {
276 max = MAX(max, c->rfd);
277 max = MAX(max, c->wfd);
278 max = MAX(max, c->efd);
279 }
280 }
281 return max;
282}
283
284int
285channel_close_fd(int *fdp)
286{
287 int ret = 0, fd = *fdp;
288
289 if (fd != -1) {
290 ret = close(fd);
291 *fdp = -1;
292 if (fd == channel_max_fd)
293 channel_max_fd = channel_find_maxfd();
294 }
295 return ret;
296}
297
Damien Miller6f83b8e2000-05-02 09:23:45 +1000298/* Close all channel fd/socket. */
299
Ben Lindstrombba81212001-06-25 05:01:22 +0000300static void
Damien Miller6f83b8e2000-05-02 09:23:45 +1000301channel_close_fds(Channel *c)
302{
Ben Lindstromc0dee1a2001-06-05 20:52:50 +0000303 debug3("channel_close_fds: channel %d: r %d w %d e %d",
304 c->self, c->rfd, c->wfd, c->efd);
305
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000306 channel_close_fd(&c->sock);
307 channel_close_fd(&c->rfd);
308 channel_close_fd(&c->wfd);
309 channel_close_fd(&c->efd);
Damien Miller6f83b8e2000-05-02 09:23:45 +1000310}
311
312/* Free the channel and close its fd/socket. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000313
Damien Miller4af51302000-04-16 11:18:38 +1000314void
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000315channel_free(Channel *c)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000316{
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000317 char *s;
Ben Lindstromc0dee1a2001-06-05 20:52:50 +0000318 int i, n;
319
320 for (n = 0, i = 0; i < channels_alloc; i++)
321 if (channels[i])
322 n++;
Ben Lindstrom4c247552001-06-05 20:56:47 +0000323 debug("channel_free: channel %d: %s, nchannels %d", c->self,
Ben Lindstromc0dee1a2001-06-05 20:52:50 +0000324 c->remote_name ? c->remote_name : "???", n);
Ben Lindstrom6c3ae2b2000-12-30 03:25:14 +0000325
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000326 s = channel_open_message();
Ben Lindstrom4c247552001-06-05 20:56:47 +0000327 debug3("channel_free: status: %s", s);
Ben Lindstrom6c3ae2b2000-12-30 03:25:14 +0000328 xfree(s);
329
Damien Miller6f83b8e2000-05-02 09:23:45 +1000330 if (c->sock != -1)
Damien Millerb38eff82000-04-01 11:09:21 +1000331 shutdown(c->sock, SHUT_RDWR);
Damien Miller6f83b8e2000-05-02 09:23:45 +1000332 channel_close_fds(c);
Damien Millerb38eff82000-04-01 11:09:21 +1000333 buffer_free(&c->input);
334 buffer_free(&c->output);
335 buffer_free(&c->extended);
Damien Millerb38eff82000-04-01 11:09:21 +1000336 if (c->remote_name) {
337 xfree(c->remote_name);
338 c->remote_name = NULL;
Damien Miller95def091999-11-25 00:26:21 +1100339 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000340 channels[c->self] = NULL;
341 xfree(c);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000342}
343
Ben Lindstrome9c99912001-06-09 00:41:05 +0000344void
Ben Lindstrom601e4362001-06-21 03:19:23 +0000345channel_free_all(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000346{
347 int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000348
Ben Lindstrom601e4362001-06-21 03:19:23 +0000349 for (i = 0; i < channels_alloc; i++)
350 if (channels[i] != NULL)
351 channel_free(channels[i]);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000352}
353
354/*
355 * Closes the sockets/fds of all channels. This is used to close extra file
356 * descriptors after a fork.
357 */
358
359void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000360channel_close_all(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000361{
362 int i;
363
364 for (i = 0; i < channels_alloc; i++)
365 if (channels[i] != NULL)
366 channel_close_fds(channels[i]);
367}
368
369/*
Ben Lindstrom809744e2001-07-04 05:26:06 +0000370 * Stop listening to channels.
371 */
372
373void
374channel_stop_listening(void)
375{
376 int i;
377 Channel *c;
378
379 for (i = 0; i < channels_alloc; i++) {
380 c = channels[i];
381 if (c != NULL) {
382 switch (c->type) {
383 case SSH_CHANNEL_AUTH_SOCKET:
384 case SSH_CHANNEL_PORT_LISTENER:
385 case SSH_CHANNEL_RPORT_LISTENER:
386 case SSH_CHANNEL_X11_LISTENER:
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000387 channel_close_fd(&c->sock);
Ben Lindstrom809744e2001-07-04 05:26:06 +0000388 channel_free(c);
389 break;
390 }
391 }
392 }
393}
394
395/*
Ben Lindstrome9c99912001-06-09 00:41:05 +0000396 * Returns true if no channel has too much buffered data, and false if one or
397 * more channel is overfull.
398 */
399
400int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000401channel_not_very_much_buffered_data(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000402{
403 u_int i;
404 Channel *c;
405
406 for (i = 0; i < channels_alloc; i++) {
407 c = channels[i];
408 if (c != NULL && c->type == SSH_CHANNEL_OPEN) {
Damien Milleraf5f2e62001-10-10 15:01:16 +1000409#if 0
410 if (!compat20 &&
411 buffer_len(&c->input) > packet_get_maxsize()) {
Ben Lindstrome9c99912001-06-09 00:41:05 +0000412 debug("channel %d: big input buffer %d",
413 c->self, buffer_len(&c->input));
414 return 0;
415 }
Damien Milleraf5f2e62001-10-10 15:01:16 +1000416#endif
Ben Lindstrome9c99912001-06-09 00:41:05 +0000417 if (buffer_len(&c->output) > packet_get_maxsize()) {
Damien Milleraf5f2e62001-10-10 15:01:16 +1000418 debug("channel %d: big output buffer %d > %d",
419 c->self, buffer_len(&c->output),
420 packet_get_maxsize());
Ben Lindstrome9c99912001-06-09 00:41:05 +0000421 return 0;
422 }
423 }
424 }
425 return 1;
426}
427
428/* Returns true if any channel is still open. */
429
430int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000431channel_still_open(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000432{
433 int i;
434 Channel *c;
435
436 for (i = 0; i < channels_alloc; i++) {
437 c = channels[i];
438 if (c == NULL)
439 continue;
440 switch (c->type) {
441 case SSH_CHANNEL_X11_LISTENER:
442 case SSH_CHANNEL_PORT_LISTENER:
443 case SSH_CHANNEL_RPORT_LISTENER:
444 case SSH_CHANNEL_CLOSED:
445 case SSH_CHANNEL_AUTH_SOCKET:
446 case SSH_CHANNEL_DYNAMIC:
447 case SSH_CHANNEL_CONNECTING:
448 case SSH_CHANNEL_ZOMBIE:
449 continue;
450 case SSH_CHANNEL_LARVAL:
451 if (!compat20)
452 fatal("cannot happen: SSH_CHANNEL_LARVAL");
453 continue;
454 case SSH_CHANNEL_OPENING:
455 case SSH_CHANNEL_OPEN:
456 case SSH_CHANNEL_X11_OPEN:
457 return 1;
458 case SSH_CHANNEL_INPUT_DRAINING:
459 case SSH_CHANNEL_OUTPUT_DRAINING:
460 if (!compat13)
461 fatal("cannot happen: OUT_DRAIN");
462 return 1;
463 default:
464 fatal("channel_still_open: bad channel type %d", c->type);
465 /* NOTREACHED */
466 }
467 }
468 return 0;
469}
470
471/* Returns the id of an open channel suitable for keepaliving */
472
473int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000474channel_find_open(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000475{
476 int i;
477 Channel *c;
478
479 for (i = 0; i < channels_alloc; i++) {
480 c = channels[i];
481 if (c == NULL)
482 continue;
483 switch (c->type) {
484 case SSH_CHANNEL_CLOSED:
485 case SSH_CHANNEL_DYNAMIC:
486 case SSH_CHANNEL_X11_LISTENER:
487 case SSH_CHANNEL_PORT_LISTENER:
488 case SSH_CHANNEL_RPORT_LISTENER:
489 case SSH_CHANNEL_OPENING:
490 case SSH_CHANNEL_CONNECTING:
491 case SSH_CHANNEL_ZOMBIE:
492 continue;
493 case SSH_CHANNEL_LARVAL:
494 case SSH_CHANNEL_AUTH_SOCKET:
495 case SSH_CHANNEL_OPEN:
496 case SSH_CHANNEL_X11_OPEN:
497 return i;
498 case SSH_CHANNEL_INPUT_DRAINING:
499 case SSH_CHANNEL_OUTPUT_DRAINING:
500 if (!compat13)
501 fatal("cannot happen: OUT_DRAIN");
502 return i;
503 default:
504 fatal("channel_find_open: bad channel type %d", c->type);
505 /* NOTREACHED */
506 }
507 }
508 return -1;
509}
510
511
512/*
513 * Returns a message describing the currently open forwarded connections,
514 * suitable for sending to the client. The message contains crlf pairs for
515 * newlines.
516 */
517
518char *
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000519channel_open_message(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000520{
521 Buffer buffer;
522 Channel *c;
523 char buf[1024], *cp;
524 int i;
525
526 buffer_init(&buffer);
527 snprintf(buf, sizeof buf, "The following connections are open:\r\n");
528 buffer_append(&buffer, buf, strlen(buf));
529 for (i = 0; i < channels_alloc; i++) {
530 c = channels[i];
531 if (c == NULL)
532 continue;
533 switch (c->type) {
534 case SSH_CHANNEL_X11_LISTENER:
535 case SSH_CHANNEL_PORT_LISTENER:
536 case SSH_CHANNEL_RPORT_LISTENER:
537 case SSH_CHANNEL_CLOSED:
538 case SSH_CHANNEL_AUTH_SOCKET:
539 case SSH_CHANNEL_ZOMBIE:
540 continue;
541 case SSH_CHANNEL_LARVAL:
542 case SSH_CHANNEL_OPENING:
543 case SSH_CHANNEL_CONNECTING:
544 case SSH_CHANNEL_DYNAMIC:
545 case SSH_CHANNEL_OPEN:
546 case SSH_CHANNEL_X11_OPEN:
547 case SSH_CHANNEL_INPUT_DRAINING:
548 case SSH_CHANNEL_OUTPUT_DRAINING:
549 snprintf(buf, sizeof buf, " #%d %.300s (t%d r%d i%d/%d o%d/%d fd %d/%d)\r\n",
550 c->self, c->remote_name,
551 c->type, c->remote_id,
552 c->istate, buffer_len(&c->input),
553 c->ostate, buffer_len(&c->output),
554 c->rfd, c->wfd);
555 buffer_append(&buffer, buf, strlen(buf));
556 continue;
557 default:
558 fatal("channel_open_message: bad channel type %d", c->type);
559 /* NOTREACHED */
560 }
561 }
562 buffer_append(&buffer, "\0", 1);
563 cp = xstrdup(buffer_ptr(&buffer));
564 buffer_free(&buffer);
565 return cp;
566}
567
568void
569channel_send_open(int id)
570{
571 Channel *c = channel_lookup(id);
572 if (c == NULL) {
573 log("channel_send_open: %d: bad id", id);
574 return;
575 }
576 debug("send channel open %d", id);
577 packet_start(SSH2_MSG_CHANNEL_OPEN);
578 packet_put_cstring(c->ctype);
579 packet_put_int(c->self);
580 packet_put_int(c->local_window);
581 packet_put_int(c->local_maxpacket);
582 packet_send();
583}
584
585void
Damien Millera500cd62002-02-08 22:04:26 +1100586channel_request_start(int local_id, char *service, int wantconfirm)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000587{
Damien Millera500cd62002-02-08 22:04:26 +1100588 Channel *c = channel_lookup(local_id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000589 if (c == NULL) {
Damien Millera500cd62002-02-08 22:04:26 +1100590 log("channel_request_start: %d: unknown channel id", local_id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000591 return;
592 }
Damien Millera500cd62002-02-08 22:04:26 +1100593 debug("channel request %d: %s", local_id, service) ;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000594 packet_start(SSH2_MSG_CHANNEL_REQUEST);
595 packet_put_int(c->remote_id);
596 packet_put_cstring(service);
597 packet_put_char(wantconfirm);
598}
599void
Damien Miller67f0bc02002-02-05 12:23:08 +1100600channel_register_confirm(int id, channel_callback_fn *fn)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000601{
602 Channel *c = channel_lookup(id);
603 if (c == NULL) {
Damien Miller67f0bc02002-02-05 12:23:08 +1100604 log("channel_register_comfirm: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000605 return;
606 }
Damien Miller67f0bc02002-02-05 12:23:08 +1100607 c->confirm = fn;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000608}
609void
610channel_register_cleanup(int id, channel_callback_fn *fn)
611{
612 Channel *c = channel_lookup(id);
613 if (c == NULL) {
614 log("channel_register_cleanup: %d: bad id", id);
615 return;
616 }
Ben Lindstrom809744e2001-07-04 05:26:06 +0000617 c->detach_user = fn;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000618}
619void
620channel_cancel_cleanup(int id)
621{
622 Channel *c = channel_lookup(id);
623 if (c == NULL) {
624 log("channel_cancel_cleanup: %d: bad id", id);
625 return;
626 }
Ben Lindstrom809744e2001-07-04 05:26:06 +0000627 c->detach_user = NULL;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000628}
629void
630channel_register_filter(int id, channel_filter_fn *fn)
631{
632 Channel *c = channel_lookup(id);
633 if (c == NULL) {
634 log("channel_register_filter: %d: bad id", id);
635 return;
636 }
637 c->input_filter = fn;
638}
639
640void
641channel_set_fds(int id, int rfd, int wfd, int efd,
Damien Miller2aa0c192002-02-19 15:20:08 +1100642 int extusage, int nonblock, u_int window_max)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000643{
644 Channel *c = channel_lookup(id);
645 if (c == NULL || c->type != SSH_CHANNEL_LARVAL)
646 fatal("channel_activate for non-larval channel %d.", id);
647 channel_register_fds(c, rfd, wfd, efd, extusage, nonblock);
648 c->type = SSH_CHANNEL_OPEN;
Damien Miller2aa0c192002-02-19 15:20:08 +1100649 c->local_window = c->local_window_max = window_max;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000650 packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
651 packet_put_int(c->remote_id);
652 packet_put_int(c->local_window);
653 packet_send();
654}
655
Damien Miller5428f641999-11-25 11:54:57 +1100656/*
Damien Millerb38eff82000-04-01 11:09:21 +1000657 * 'channel_pre*' are called just before select() to add any bits relevant to
658 * channels in the select bitmasks.
Damien Miller5428f641999-11-25 11:54:57 +1100659 */
Damien Millerb38eff82000-04-01 11:09:21 +1000660/*
661 * 'channel_post*': perform any appropriate operations for channels which
662 * have events pending.
663 */
664typedef void chan_fn(Channel *c, fd_set * readset, fd_set * writeset);
665chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE];
666chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE];
667
Ben Lindstrombba81212001-06-25 05:01:22 +0000668static void
Damien Millerb38eff82000-04-01 11:09:21 +1000669channel_pre_listener(Channel *c, fd_set * readset, fd_set * writeset)
670{
671 FD_SET(c->sock, readset);
672}
673
Ben Lindstrombba81212001-06-25 05:01:22 +0000674static void
Ben Lindstrom7ad97102000-12-06 01:42:49 +0000675channel_pre_connecting(Channel *c, fd_set * readset, fd_set * writeset)
676{
677 debug3("channel %d: waiting for connection", c->self);
678 FD_SET(c->sock, writeset);
679}
680
Ben Lindstrombba81212001-06-25 05:01:22 +0000681static void
Damien Millerb38eff82000-04-01 11:09:21 +1000682channel_pre_open_13(Channel *c, fd_set * readset, fd_set * writeset)
683{
684 if (buffer_len(&c->input) < packet_get_maxsize())
685 FD_SET(c->sock, readset);
686 if (buffer_len(&c->output) > 0)
687 FD_SET(c->sock, writeset);
688}
689
Ben Lindstrombba81212001-06-25 05:01:22 +0000690static void
Damien Millerde6987c2002-01-22 23:20:40 +1100691channel_pre_open(Channel *c, fd_set * readset, fd_set * writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000692{
Damien Millerde6987c2002-01-22 23:20:40 +1100693 u_int limit = compat20 ? c->remote_window : packet_get_maxsize();
Damien Millerb38eff82000-04-01 11:09:21 +1000694
Damien Miller33b13562000-04-04 14:38:59 +1000695 if (c->istate == CHAN_INPUT_OPEN &&
Damien Millerde6987c2002-01-22 23:20:40 +1100696 limit > 0 &&
697 buffer_len(&c->input) < limit)
Damien Miller33b13562000-04-04 14:38:59 +1000698 FD_SET(c->rfd, readset);
699 if (c->ostate == CHAN_OUTPUT_OPEN ||
700 c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
701 if (buffer_len(&c->output) > 0) {
702 FD_SET(c->wfd, writeset);
703 } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
Ben Lindstromcf159442002-03-26 03:26:24 +0000704 if (CHANNEL_EFD_OUTPUT_ACTIVE(c))
Ben Lindstrom5a6abda2002-06-09 19:41:48 +0000705 debug2("channel %d: obuf_empty delayed efd %d/(%d)",
706 c->self, c->efd, buffer_len(&c->extended));
Ben Lindstromcf159442002-03-26 03:26:24 +0000707 else
708 chan_obuf_empty(c);
Damien Miller33b13562000-04-04 14:38:59 +1000709 }
710 }
711 /** XXX check close conditions, too */
Damien Millerde6987c2002-01-22 23:20:40 +1100712 if (compat20 && c->efd != -1) {
Damien Miller33b13562000-04-04 14:38:59 +1000713 if (c->extended_usage == CHAN_EXTENDED_WRITE &&
714 buffer_len(&c->extended) > 0)
715 FD_SET(c->efd, writeset);
Ben Lindstromcf159442002-03-26 03:26:24 +0000716 else if (!(c->flags & CHAN_EOF_SENT) &&
717 c->extended_usage == CHAN_EXTENDED_READ &&
Damien Miller33b13562000-04-04 14:38:59 +1000718 buffer_len(&c->extended) < c->remote_window)
719 FD_SET(c->efd, readset);
720 }
721}
722
Ben Lindstrombba81212001-06-25 05:01:22 +0000723static void
Damien Millerb38eff82000-04-01 11:09:21 +1000724channel_pre_input_draining(Channel *c, fd_set * readset, fd_set * writeset)
725{
726 if (buffer_len(&c->input) == 0) {
727 packet_start(SSH_MSG_CHANNEL_CLOSE);
728 packet_put_int(c->remote_id);
729 packet_send();
730 c->type = SSH_CHANNEL_CLOSED;
Ben Lindstromc486d882001-04-11 16:08:34 +0000731 debug("channel %d: closing after input drain.", c->self);
Damien Millerb38eff82000-04-01 11:09:21 +1000732 }
733}
734
Ben Lindstrombba81212001-06-25 05:01:22 +0000735static void
Damien Millerb38eff82000-04-01 11:09:21 +1000736channel_pre_output_draining(Channel *c, fd_set * readset, fd_set * writeset)
737{
738 if (buffer_len(&c->output) == 0)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000739 chan_mark_dead(c);
Damien Miller4af51302000-04-16 11:18:38 +1000740 else
Damien Millerb38eff82000-04-01 11:09:21 +1000741 FD_SET(c->sock, writeset);
742}
743
744/*
745 * This is a special state for X11 authentication spoofing. An opened X11
746 * connection (when authentication spoofing is being done) remains in this
747 * state until the first packet has been completely read. The authentication
748 * data in that packet is then substituted by the real data if it matches the
749 * fake data, and the channel is put into normal mode.
Damien Millerbd483e72000-04-30 10:00:53 +1000750 * XXX All this happens at the client side.
Ben Lindstrome9c99912001-06-09 00:41:05 +0000751 * Returns: 0 = need more data, -1 = wrong cookie, 1 = ok
Damien Millerb38eff82000-04-01 11:09:21 +1000752 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000753static int
Ben Lindstrome9c99912001-06-09 00:41:05 +0000754x11_open_helper(Buffer *b)
Damien Millerb38eff82000-04-01 11:09:21 +1000755{
Ben Lindstrom46c16222000-12-22 01:43:59 +0000756 u_char *ucp;
757 u_int proto_len, data_len;
Damien Millerb38eff82000-04-01 11:09:21 +1000758
759 /* Check if the fixed size part of the packet is in buffer. */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000760 if (buffer_len(b) < 12)
Damien Millerb38eff82000-04-01 11:09:21 +1000761 return 0;
762
763 /* Parse the lengths of variable-length fields. */
Damien Miller708d21c2002-01-22 23:18:15 +1100764 ucp = buffer_ptr(b);
Damien Millerb38eff82000-04-01 11:09:21 +1000765 if (ucp[0] == 0x42) { /* Byte order MSB first. */
766 proto_len = 256 * ucp[6] + ucp[7];
767 data_len = 256 * ucp[8] + ucp[9];
768 } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */
769 proto_len = ucp[6] + 256 * ucp[7];
770 data_len = ucp[8] + 256 * ucp[9];
771 } else {
772 debug("Initial X11 packet contains bad byte order byte: 0x%x",
Damien Miller9f0f5c62001-12-21 14:45:46 +1100773 ucp[0]);
Damien Millerb38eff82000-04-01 11:09:21 +1000774 return -1;
775 }
776
777 /* Check if the whole packet is in buffer. */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000778 if (buffer_len(b) <
Damien Millerb38eff82000-04-01 11:09:21 +1000779 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3))
780 return 0;
781
782 /* Check if authentication protocol matches. */
783 if (proto_len != strlen(x11_saved_proto) ||
784 memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) {
785 debug("X11 connection uses different authentication protocol.");
786 return -1;
787 }
788 /* Check if authentication data matches our fake data. */
789 if (data_len != x11_fake_data_len ||
790 memcmp(ucp + 12 + ((proto_len + 3) & ~3),
791 x11_fake_data, x11_fake_data_len) != 0) {
792 debug("X11 auth data does not match fake data.");
793 return -1;
794 }
795 /* Check fake data length */
796 if (x11_fake_data_len != x11_saved_data_len) {
797 error("X11 fake_data_len %d != saved_data_len %d",
798 x11_fake_data_len, x11_saved_data_len);
799 return -1;
800 }
801 /*
802 * Received authentication protocol and data match
803 * our fake data. Substitute the fake data with real
804 * data.
805 */
806 memcpy(ucp + 12 + ((proto_len + 3) & ~3),
807 x11_saved_data, x11_saved_data_len);
808 return 1;
809}
810
Ben Lindstrombba81212001-06-25 05:01:22 +0000811static void
Damien Millerb38eff82000-04-01 11:09:21 +1000812channel_pre_x11_open_13(Channel *c, fd_set * readset, fd_set * writeset)
813{
Ben Lindstrome9c99912001-06-09 00:41:05 +0000814 int ret = x11_open_helper(&c->output);
Damien Millerb38eff82000-04-01 11:09:21 +1000815 if (ret == 1) {
816 /* Start normal processing for the channel. */
817 c->type = SSH_CHANNEL_OPEN;
Damien Miller78928792000-04-12 20:17:38 +1000818 channel_pre_open_13(c, readset, writeset);
Damien Millerb38eff82000-04-01 11:09:21 +1000819 } else if (ret == -1) {
820 /*
821 * We have received an X11 connection that has bad
822 * authentication information.
823 */
Ben Lindstrom6df8ef42001-03-05 07:47:23 +0000824 log("X11 connection rejected because of wrong authentication.");
Damien Millerb38eff82000-04-01 11:09:21 +1000825 buffer_clear(&c->input);
826 buffer_clear(&c->output);
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000827 channel_close_fd(&c->sock);
Damien Millerb38eff82000-04-01 11:09:21 +1000828 c->sock = -1;
829 c->type = SSH_CHANNEL_CLOSED;
830 packet_start(SSH_MSG_CHANNEL_CLOSE);
831 packet_put_int(c->remote_id);
832 packet_send();
833 }
834}
835
Ben Lindstrombba81212001-06-25 05:01:22 +0000836static void
Damien Millerbd483e72000-04-30 10:00:53 +1000837channel_pre_x11_open(Channel *c, fd_set * readset, fd_set * writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000838{
Ben Lindstrome9c99912001-06-09 00:41:05 +0000839 int ret = x11_open_helper(&c->output);
Ben Lindstrom944c4f02001-09-18 05:51:13 +0000840
841 /* c->force_drain = 1; */
842
Damien Millerb38eff82000-04-01 11:09:21 +1000843 if (ret == 1) {
844 c->type = SSH_CHANNEL_OPEN;
Damien Millerde6987c2002-01-22 23:20:40 +1100845 channel_pre_open(c, readset, writeset);
Damien Millerb38eff82000-04-01 11:09:21 +1000846 } else if (ret == -1) {
Damien Millera90fc082002-01-22 23:19:38 +1100847 log("X11 connection rejected because of wrong authentication.");
Damien Millerb38eff82000-04-01 11:09:21 +1000848 debug("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate);
Damien Millera90fc082002-01-22 23:19:38 +1100849 chan_read_failed(c);
850 buffer_clear(&c->input);
851 chan_ibuf_empty(c);
852 buffer_clear(&c->output);
853 /* for proto v1, the peer will send an IEOF */
854 if (compat20)
855 chan_write_failed(c);
856 else
857 c->type = SSH_CHANNEL_OPEN;
Damien Millerb38eff82000-04-01 11:09:21 +1000858 debug("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate);
859 }
860}
861
Ben Lindstromb3921512001-04-11 15:57:50 +0000862/* try to decode a socks4 header */
Ben Lindstrombba81212001-06-25 05:01:22 +0000863static int
Ben Lindstromb3921512001-04-11 15:57:50 +0000864channel_decode_socks4(Channel *c, fd_set * readset, fd_set * writeset)
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000865{
866 u_char *p, *host;
Ben Lindstrom2b261b92001-04-17 18:14:34 +0000867 int len, have, i, found;
Damien Miller9f0f5c62001-12-21 14:45:46 +1100868 char username[256];
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000869 struct {
870 u_int8_t version;
871 u_int8_t command;
872 u_int16_t dest_port;
Ben Lindstromb3921512001-04-11 15:57:50 +0000873 struct in_addr dest_addr;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000874 } s4_req, s4_rsp;
875
Ben Lindstromb3921512001-04-11 15:57:50 +0000876 debug2("channel %d: decode socks4", c->self);
Ben Lindstrom2b261b92001-04-17 18:14:34 +0000877
878 have = buffer_len(&c->input);
879 len = sizeof(s4_req);
880 if (have < len)
881 return 0;
882 p = buffer_ptr(&c->input);
883 for (found = 0, i = len; i < have; i++) {
884 if (p[i] == '\0') {
885 found = 1;
886 break;
887 }
888 if (i > 1024) {
889 /* the peer is probably sending garbage */
890 debug("channel %d: decode socks4: too long",
891 c->self);
892 return -1;
893 }
894 }
895 if (!found)
896 return 0;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000897 buffer_get(&c->input, (char *)&s4_req.version, 1);
898 buffer_get(&c->input, (char *)&s4_req.command, 1);
899 buffer_get(&c->input, (char *)&s4_req.dest_port, 2);
Ben Lindstromb3921512001-04-11 15:57:50 +0000900 buffer_get(&c->input, (char *)&s4_req.dest_addr, 4);
Ben Lindstrom2b261b92001-04-17 18:14:34 +0000901 have = buffer_len(&c->input);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000902 p = buffer_ptr(&c->input);
903 len = strlen(p);
Ben Lindstrom6fa9d102001-04-11 23:08:17 +0000904 debug2("channel %d: decode socks4: user %s/%d", c->self, p, len);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000905 if (len > have)
Ben Lindstromb3921512001-04-11 15:57:50 +0000906 fatal("channel %d: decode socks4: len %d > have %d",
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000907 c->self, len, have);
908 strlcpy(username, p, sizeof(username));
909 buffer_consume(&c->input, len);
910 buffer_consume(&c->input, 1); /* trailing '\0' */
911
Ben Lindstromb3921512001-04-11 15:57:50 +0000912 host = inet_ntoa(s4_req.dest_addr);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000913 strlcpy(c->path, host, sizeof(c->path));
914 c->host_port = ntohs(s4_req.dest_port);
Damien Miller9f0f5c62001-12-21 14:45:46 +1100915
Ben Lindstrom6fa9d102001-04-11 23:08:17 +0000916 debug("channel %d: dynamic request: socks4 host %s port %u command %u",
917 c->self, host, c->host_port, s4_req.command);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000918
Ben Lindstromb3921512001-04-11 15:57:50 +0000919 if (s4_req.command != 1) {
920 debug("channel %d: cannot handle: socks4 cn %d",
921 c->self, s4_req.command);
922 return -1;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000923 }
Ben Lindstromb3921512001-04-11 15:57:50 +0000924 s4_rsp.version = 0; /* vn: 0 for reply */
925 s4_rsp.command = 90; /* cd: req granted */
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000926 s4_rsp.dest_port = 0; /* ignored */
Ben Lindstromb3921512001-04-11 15:57:50 +0000927 s4_rsp.dest_addr.s_addr = INADDR_ANY; /* ignored */
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000928 buffer_append(&c->output, (char *)&s4_rsp, sizeof(s4_rsp));
Ben Lindstromb3921512001-04-11 15:57:50 +0000929 return 1;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000930}
931
Ben Lindstromb3921512001-04-11 15:57:50 +0000932/* dynamic port forwarding */
Ben Lindstrombba81212001-06-25 05:01:22 +0000933static void
Ben Lindstromb3921512001-04-11 15:57:50 +0000934channel_pre_dynamic(Channel *c, fd_set * readset, fd_set * writeset)
935{
936 u_char *p;
937 int have, ret;
938
939 have = buffer_len(&c->input);
Damien Miller4623a752001-10-10 15:03:58 +1000940 c->delayed = 0;
Ben Lindstromb3921512001-04-11 15:57:50 +0000941 debug2("channel %d: pre_dynamic: have %d", c->self, have);
Ben Lindstromc486d882001-04-11 16:08:34 +0000942 /* buffer_dump(&c->input); */
Ben Lindstromb3921512001-04-11 15:57:50 +0000943 /* check if the fixed size part of the packet is in buffer. */
944 if (have < 4) {
945 /* need more */
946 FD_SET(c->sock, readset);
947 return;
948 }
949 /* try to guess the protocol */
950 p = buffer_ptr(&c->input);
951 switch (p[0]) {
Ben Lindstrom6fa9d102001-04-11 23:08:17 +0000952 case 0x04:
953 ret = channel_decode_socks4(c, readset, writeset);
954 break;
Ben Lindstromb3921512001-04-11 15:57:50 +0000955 default:
956 ret = -1;
957 break;
958 }
959 if (ret < 0) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000960 chan_mark_dead(c);
Ben Lindstromb3921512001-04-11 15:57:50 +0000961 } else if (ret == 0) {
962 debug2("channel %d: pre_dynamic: need more", c->self);
963 /* need more */
964 FD_SET(c->sock, readset);
965 } else {
966 /* switch to the next state */
967 c->type = SSH_CHANNEL_OPENING;
968 port_open_helper(c, "direct-tcpip");
969 }
970}
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000971
Damien Millerb38eff82000-04-01 11:09:21 +1000972/* This is our fake X11 server socket. */
Ben Lindstrombba81212001-06-25 05:01:22 +0000973static void
Damien Millerb38eff82000-04-01 11:09:21 +1000974channel_post_x11_listener(Channel *c, fd_set * readset, fd_set * writeset)
975{
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000976 Channel *nc;
Damien Millerb38eff82000-04-01 11:09:21 +1000977 struct sockaddr addr;
Damien Miller398e1cf2002-02-05 11:52:13 +1100978 int newsock;
Damien Millerb38eff82000-04-01 11:09:21 +1000979 socklen_t addrlen;
Damien Millerd83ff352001-01-30 09:19:34 +1100980 char buf[16384], *remote_ipaddr;
Damien Millerbd483e72000-04-30 10:00:53 +1000981 int remote_port;
Damien Millerb38eff82000-04-01 11:09:21 +1000982
983 if (FD_ISSET(c->sock, readset)) {
984 debug("X11 connection requested.");
985 addrlen = sizeof(addr);
986 newsock = accept(c->sock, &addr, &addrlen);
Damien Millere7378562001-12-21 14:58:35 +1100987 if (c->single_connection) {
988 debug("single_connection: closing X11 listener.");
989 channel_close_fd(&c->sock);
990 chan_mark_dead(c);
991 }
Damien Millerb38eff82000-04-01 11:09:21 +1000992 if (newsock < 0) {
993 error("accept: %.100s", strerror(errno));
994 return;
995 }
Damien Miller398e1cf2002-02-05 11:52:13 +1100996 set_nodelay(newsock);
Damien Millerd83ff352001-01-30 09:19:34 +1100997 remote_ipaddr = get_peer_ipaddr(newsock);
Damien Millerbd483e72000-04-30 10:00:53 +1000998 remote_port = get_peer_port(newsock);
Damien Millerb38eff82000-04-01 11:09:21 +1000999 snprintf(buf, sizeof buf, "X11 connection from %.200s port %d",
Damien Millerd83ff352001-01-30 09:19:34 +11001000 remote_ipaddr, remote_port);
Damien Millerbd483e72000-04-30 10:00:53 +10001001
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001002 nc = channel_new("accepted x11 socket",
Damien Millerbd483e72000-04-30 10:00:53 +10001003 SSH_CHANNEL_OPENING, newsock, newsock, -1,
1004 c->local_window_max, c->local_maxpacket,
Damien Miller69b69aa2000-10-28 14:19:58 +11001005 0, xstrdup(buf), 1);
Damien Millerbd483e72000-04-30 10:00:53 +10001006 if (compat20) {
1007 packet_start(SSH2_MSG_CHANNEL_OPEN);
1008 packet_put_cstring("x11");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001009 packet_put_int(nc->self);
Damien Millere7378562001-12-21 14:58:35 +11001010 packet_put_int(nc->local_window_max);
1011 packet_put_int(nc->local_maxpacket);
Damien Millerd83ff352001-01-30 09:19:34 +11001012 /* originator ipaddr and port */
1013 packet_put_cstring(remote_ipaddr);
Damien Miller30c3d422000-05-09 11:02:59 +10001014 if (datafellows & SSH_BUG_X11FWD) {
1015 debug("ssh2 x11 bug compat mode");
1016 } else {
1017 packet_put_int(remote_port);
1018 }
Damien Millerbd483e72000-04-30 10:00:53 +10001019 packet_send();
1020 } else {
1021 packet_start(SSH_SMSG_X11_OPEN);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001022 packet_put_int(nc->self);
Ben Lindstrome9c99912001-06-09 00:41:05 +00001023 if (packet_get_protocol_flags() &
1024 SSH_PROTOFLAG_HOST_IN_FWD_OPEN)
Ben Lindstrom664408d2001-06-09 01:42:01 +00001025 packet_put_cstring(buf);
Damien Millerbd483e72000-04-30 10:00:53 +10001026 packet_send();
1027 }
Damien Millerd83ff352001-01-30 09:19:34 +11001028 xfree(remote_ipaddr);
Damien Millerb38eff82000-04-01 11:09:21 +10001029 }
1030}
1031
Ben Lindstrombba81212001-06-25 05:01:22 +00001032static void
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001033port_open_helper(Channel *c, char *rtype)
1034{
1035 int direct;
1036 char buf[1024];
1037 char *remote_ipaddr = get_peer_ipaddr(c->sock);
1038 u_short remote_port = get_peer_port(c->sock);
1039
1040 direct = (strcmp(rtype, "direct-tcpip") == 0);
1041
1042 snprintf(buf, sizeof buf,
1043 "%s: listening port %d for %.100s port %d, "
1044 "connect from %.200s port %d",
1045 rtype, c->listening_port, c->path, c->host_port,
1046 remote_ipaddr, remote_port);
1047
1048 xfree(c->remote_name);
1049 c->remote_name = xstrdup(buf);
1050
1051 if (compat20) {
1052 packet_start(SSH2_MSG_CHANNEL_OPEN);
1053 packet_put_cstring(rtype);
1054 packet_put_int(c->self);
1055 packet_put_int(c->local_window_max);
1056 packet_put_int(c->local_maxpacket);
1057 if (direct) {
1058 /* target host, port */
1059 packet_put_cstring(c->path);
1060 packet_put_int(c->host_port);
1061 } else {
1062 /* listen address, port */
1063 packet_put_cstring(c->path);
1064 packet_put_int(c->listening_port);
1065 }
1066 /* originator host and port */
1067 packet_put_cstring(remote_ipaddr);
1068 packet_put_int(remote_port);
1069 packet_send();
1070 } else {
1071 packet_start(SSH_MSG_PORT_OPEN);
1072 packet_put_int(c->self);
1073 packet_put_cstring(c->path);
1074 packet_put_int(c->host_port);
Ben Lindstrome9c99912001-06-09 00:41:05 +00001075 if (packet_get_protocol_flags() &
1076 SSH_PROTOFLAG_HOST_IN_FWD_OPEN)
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001077 packet_put_cstring(c->remote_name);
1078 packet_send();
1079 }
1080 xfree(remote_ipaddr);
1081}
1082
Damien Millerb38eff82000-04-01 11:09:21 +10001083/*
1084 * This socket is listening for connections to a forwarded TCP/IP port.
1085 */
Ben Lindstrombba81212001-06-25 05:01:22 +00001086static void
Damien Millerb38eff82000-04-01 11:09:21 +10001087channel_post_port_listener(Channel *c, fd_set * readset, fd_set * writeset)
1088{
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001089 Channel *nc;
Damien Millerb38eff82000-04-01 11:09:21 +10001090 struct sockaddr addr;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001091 int newsock, nextstate;
Damien Millerb38eff82000-04-01 11:09:21 +10001092 socklen_t addrlen;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001093 char *rtype;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001094
Damien Millerb38eff82000-04-01 11:09:21 +10001095 if (FD_ISSET(c->sock, readset)) {
1096 debug("Connection to port %d forwarding "
1097 "to %.100s port %d requested.",
1098 c->listening_port, c->path, c->host_port);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001099
Damien Miller4623a752001-10-10 15:03:58 +10001100 if (c->type == SSH_CHANNEL_RPORT_LISTENER) {
1101 nextstate = SSH_CHANNEL_OPENING;
1102 rtype = "forwarded-tcpip";
1103 } else {
1104 if (c->host_port == 0) {
1105 nextstate = SSH_CHANNEL_DYNAMIC;
Damien Millerd3c04b92001-10-10 15:04:20 +10001106 rtype = "dynamic-tcpip";
Damien Miller4623a752001-10-10 15:03:58 +10001107 } else {
1108 nextstate = SSH_CHANNEL_OPENING;
1109 rtype = "direct-tcpip";
1110 }
1111 }
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001112
Damien Millerb38eff82000-04-01 11:09:21 +10001113 addrlen = sizeof(addr);
1114 newsock = accept(c->sock, &addr, &addrlen);
1115 if (newsock < 0) {
1116 error("accept: %.100s", strerror(errno));
1117 return;
1118 }
Ben Lindstrom1ebd7a52002-02-26 18:12:51 +00001119 set_nodelay(newsock);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001120 nc = channel_new(rtype,
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001121 nextstate, newsock, newsock, -1,
Damien Millerb38eff82000-04-01 11:09:21 +10001122 c->local_window_max, c->local_maxpacket,
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001123 0, xstrdup(rtype), 1);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001124 nc->listening_port = c->listening_port;
1125 nc->host_port = c->host_port;
1126 strlcpy(nc->path, c->path, sizeof(nc->path));
1127
Damien Miller4623a752001-10-10 15:03:58 +10001128 if (nextstate == SSH_CHANNEL_DYNAMIC) {
1129 /*
1130 * do not call the channel_post handler until
1131 * this flag has been reset by a pre-handler.
1132 * otherwise the FD_ISSET calls might overflow
1133 */
1134 nc->delayed = 1;
1135 } else {
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001136 port_open_helper(nc, rtype);
Damien Miller4623a752001-10-10 15:03:58 +10001137 }
Damien Millerb38eff82000-04-01 11:09:21 +10001138 }
1139}
1140
1141/*
1142 * This is the authentication agent socket listening for connections from
1143 * clients.
1144 */
Ben Lindstrombba81212001-06-25 05:01:22 +00001145static void
Damien Millerb38eff82000-04-01 11:09:21 +10001146channel_post_auth_listener(Channel *c, fd_set * readset, fd_set * writeset)
1147{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001148 Channel *nc;
Ben Lindstrome9c99912001-06-09 00:41:05 +00001149 char *name;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001150 int newsock;
Damien Millerb38eff82000-04-01 11:09:21 +10001151 struct sockaddr addr;
Damien Millerb38eff82000-04-01 11:09:21 +10001152 socklen_t addrlen;
1153
1154 if (FD_ISSET(c->sock, readset)) {
1155 addrlen = sizeof(addr);
1156 newsock = accept(c->sock, &addr, &addrlen);
1157 if (newsock < 0) {
1158 error("accept from auth socket: %.100s", strerror(errno));
1159 return;
1160 }
Ben Lindstrome9c99912001-06-09 00:41:05 +00001161 name = xstrdup("accepted auth socket");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001162 nc = channel_new("accepted auth socket",
Damien Miller0bc1bd82000-11-13 22:57:25 +11001163 SSH_CHANNEL_OPENING, newsock, newsock, -1,
1164 c->local_window_max, c->local_maxpacket,
Ben Lindstrome9c99912001-06-09 00:41:05 +00001165 0, name, 1);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001166 if (compat20) {
1167 packet_start(SSH2_MSG_CHANNEL_OPEN);
1168 packet_put_cstring("auth-agent@openssh.com");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001169 packet_put_int(nc->self);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001170 packet_put_int(c->local_window_max);
1171 packet_put_int(c->local_maxpacket);
1172 } else {
1173 packet_start(SSH_SMSG_AGENT_OPEN);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001174 packet_put_int(nc->self);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001175 }
Damien Millerb38eff82000-04-01 11:09:21 +10001176 packet_send();
1177 }
1178}
1179
Ben Lindstrombba81212001-06-25 05:01:22 +00001180static void
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001181channel_post_connecting(Channel *c, fd_set * readset, fd_set * writeset)
1182{
Ben Lindstrom69128662001-05-08 20:07:39 +00001183 int err = 0;
Ben Lindstrom11180952001-07-04 05:13:35 +00001184 socklen_t sz = sizeof(err);
Ben Lindstrom69128662001-05-08 20:07:39 +00001185
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001186 if (FD_ISSET(c->sock, writeset)) {
Ben Lindstrom733a2352002-03-05 01:31:28 +00001187 if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, &err, &sz) < 0) {
Ben Lindstrom69128662001-05-08 20:07:39 +00001188 err = errno;
1189 error("getsockopt SO_ERROR failed");
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001190 }
Ben Lindstrom69128662001-05-08 20:07:39 +00001191 if (err == 0) {
1192 debug("channel %d: connected", c->self);
1193 c->type = SSH_CHANNEL_OPEN;
1194 if (compat20) {
1195 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1196 packet_put_int(c->remote_id);
1197 packet_put_int(c->self);
1198 packet_put_int(c->local_window);
1199 packet_put_int(c->local_maxpacket);
1200 } else {
1201 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1202 packet_put_int(c->remote_id);
1203 packet_put_int(c->self);
1204 }
1205 } else {
1206 debug("channel %d: not connected: %s",
1207 c->self, strerror(err));
1208 if (compat20) {
1209 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1210 packet_put_int(c->remote_id);
1211 packet_put_int(SSH2_OPEN_CONNECT_FAILED);
1212 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1213 packet_put_cstring(strerror(err));
1214 packet_put_cstring("");
1215 }
1216 } else {
1217 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1218 packet_put_int(c->remote_id);
1219 }
1220 chan_mark_dead(c);
1221 }
1222 packet_send();
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001223 }
1224}
1225
Ben Lindstrombba81212001-06-25 05:01:22 +00001226static int
Damien Millerb38eff82000-04-01 11:09:21 +10001227channel_handle_rfd(Channel *c, fd_set * readset, fd_set * writeset)
1228{
1229 char buf[16*1024];
1230 int len;
1231
Ben Lindstromc0dee1a2001-06-05 20:52:50 +00001232 if (c->rfd != -1 &&
Damien Millerb38eff82000-04-01 11:09:21 +10001233 FD_ISSET(c->rfd, readset)) {
1234 len = read(c->rfd, buf, sizeof(buf));
Damien Miller6f83b8e2000-05-02 09:23:45 +10001235 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1236 return 1;
Damien Millerb38eff82000-04-01 11:09:21 +10001237 if (len <= 0) {
Damien Millerbd483e72000-04-30 10:00:53 +10001238 debug("channel %d: read<=0 rfd %d len %d",
Damien Millerb38eff82000-04-01 11:09:21 +10001239 c->self, c->rfd, len);
Ben Lindstromb3921512001-04-11 15:57:50 +00001240 if (c->type != SSH_CHANNEL_OPEN) {
1241 debug("channel %d: not open", c->self);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001242 chan_mark_dead(c);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001243 return -1;
Ben Lindstromb3921512001-04-11 15:57:50 +00001244 } else if (compat13) {
Damien Miller76765c02002-01-22 23:21:15 +11001245 buffer_clear(&c->output);
Damien Millerb38eff82000-04-01 11:09:21 +10001246 c->type = SSH_CHANNEL_INPUT_DRAINING;
Ben Lindstrome9c99912001-06-09 00:41:05 +00001247 debug("channel %d: input draining.", c->self);
Damien Millerb38eff82000-04-01 11:09:21 +10001248 } else {
1249 chan_read_failed(c);
1250 }
1251 return -1;
1252 }
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00001253 if (c->input_filter != NULL) {
Damien Millerad833b32000-08-23 10:46:23 +10001254 if (c->input_filter(c, buf, len) == -1) {
Ben Lindstromc486d882001-04-11 16:08:34 +00001255 debug("channel %d: filter stops", c->self);
Damien Millerad833b32000-08-23 10:46:23 +10001256 chan_read_failed(c);
1257 }
1258 } else {
1259 buffer_append(&c->input, buf, len);
1260 }
Damien Millerb38eff82000-04-01 11:09:21 +10001261 }
1262 return 1;
1263}
Ben Lindstrombba81212001-06-25 05:01:22 +00001264static int
Damien Millerb38eff82000-04-01 11:09:21 +10001265channel_handle_wfd(Channel *c, fd_set * readset, fd_set * writeset)
1266{
Ben Lindstrome229b252001-03-05 06:28:06 +00001267 struct termios tio;
Ben Lindstrom6d218f42001-09-18 05:53:12 +00001268 u_char *data;
1269 u_int dlen;
Damien Millerb38eff82000-04-01 11:09:21 +10001270 int len;
1271
1272 /* Send buffered output data to the socket. */
Ben Lindstromc0dee1a2001-06-05 20:52:50 +00001273 if (c->wfd != -1 &&
Damien Millerb38eff82000-04-01 11:09:21 +10001274 FD_ISSET(c->wfd, writeset) &&
1275 buffer_len(&c->output) > 0) {
Ben Lindstrom6d218f42001-09-18 05:53:12 +00001276 data = buffer_ptr(&c->output);
1277 dlen = buffer_len(&c->output);
1278 len = write(c->wfd, data, dlen);
Damien Miller6f83b8e2000-05-02 09:23:45 +10001279 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1280 return 1;
Damien Millerb38eff82000-04-01 11:09:21 +10001281 if (len <= 0) {
Ben Lindstromb3921512001-04-11 15:57:50 +00001282 if (c->type != SSH_CHANNEL_OPEN) {
1283 debug("channel %d: not open", c->self);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001284 chan_mark_dead(c);
Ben Lindstromb3921512001-04-11 15:57:50 +00001285 return -1;
1286 } else if (compat13) {
Damien Miller76765c02002-01-22 23:21:15 +11001287 buffer_clear(&c->output);
Ben Lindstrome9c99912001-06-09 00:41:05 +00001288 debug("channel %d: input draining.", c->self);
Damien Millerb38eff82000-04-01 11:09:21 +10001289 c->type = SSH_CHANNEL_INPUT_DRAINING;
1290 } else {
1291 chan_write_failed(c);
1292 }
1293 return -1;
1294 }
Ben Lindstrom6d218f42001-09-18 05:53:12 +00001295 if (compat20 && c->isatty && dlen >= 1 && data[0] != '\r') {
Damien Miller79438cc2001-02-16 12:34:57 +11001296 if (tcgetattr(c->wfd, &tio) == 0 &&
1297 !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) {
1298 /*
1299 * Simulate echo to reduce the impact of
Ben Lindstromb40204b2001-03-05 06:29:44 +00001300 * traffic analysis. We need to match the
Ben Lindstrome229b252001-03-05 06:28:06 +00001301 * size of a SSH2_MSG_CHANNEL_DATA message
1302 * (4 byte channel id + data)
Damien Miller79438cc2001-02-16 12:34:57 +11001303 */
Ben Lindstrome229b252001-03-05 06:28:06 +00001304 packet_send_ignore(4 + len);
Damien Miller79438cc2001-02-16 12:34:57 +11001305 packet_send();
Damien Miller79438cc2001-02-16 12:34:57 +11001306 }
1307 }
Damien Millerb38eff82000-04-01 11:09:21 +10001308 buffer_consume(&c->output, len);
Damien Miller33b13562000-04-04 14:38:59 +10001309 if (compat20 && len > 0) {
1310 c->local_consumed += len;
1311 }
1312 }
1313 return 1;
1314}
Ben Lindstrombba81212001-06-25 05:01:22 +00001315static int
Damien Miller33b13562000-04-04 14:38:59 +10001316channel_handle_efd(Channel *c, fd_set * readset, fd_set * writeset)
1317{
1318 char buf[16*1024];
1319 int len;
1320
Damien Miller1383bd82000-04-06 12:32:37 +10001321/** XXX handle drain efd, too */
Damien Miller33b13562000-04-04 14:38:59 +10001322 if (c->efd != -1) {
1323 if (c->extended_usage == CHAN_EXTENDED_WRITE &&
1324 FD_ISSET(c->efd, writeset) &&
1325 buffer_len(&c->extended) > 0) {
1326 len = write(c->efd, buffer_ptr(&c->extended),
1327 buffer_len(&c->extended));
Damien Millerd3444942000-09-30 14:20:03 +11001328 debug2("channel %d: written %d to efd %d",
Damien Miller33b13562000-04-04 14:38:59 +10001329 c->self, len, c->efd);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001330 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1331 return 1;
1332 if (len <= 0) {
1333 debug2("channel %d: closing write-efd %d",
1334 c->self, c->efd);
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001335 channel_close_fd(&c->efd);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001336 } else {
Damien Miller33b13562000-04-04 14:38:59 +10001337 buffer_consume(&c->extended, len);
1338 c->local_consumed += len;
1339 }
1340 } else if (c->extended_usage == CHAN_EXTENDED_READ &&
1341 FD_ISSET(c->efd, readset)) {
1342 len = read(c->efd, buf, sizeof(buf));
Damien Millerd3444942000-09-30 14:20:03 +11001343 debug2("channel %d: read %d from efd %d",
Damien Miller9f0f5c62001-12-21 14:45:46 +11001344 c->self, len, c->efd);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001345 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1346 return 1;
1347 if (len <= 0) {
1348 debug2("channel %d: closing read-efd %d",
Damien Miller1383bd82000-04-06 12:32:37 +10001349 c->self, c->efd);
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001350 channel_close_fd(&c->efd);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001351 } else {
Damien Miller33b13562000-04-04 14:38:59 +10001352 buffer_append(&c->extended, buf, len);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001353 }
Damien Miller33b13562000-04-04 14:38:59 +10001354 }
1355 }
1356 return 1;
1357}
Ben Lindstrombba81212001-06-25 05:01:22 +00001358static int
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001359channel_check_window(Channel *c)
Damien Miller33b13562000-04-04 14:38:59 +10001360{
Ben Lindstromb3921512001-04-11 15:57:50 +00001361 if (c->type == SSH_CHANNEL_OPEN &&
1362 !(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) &&
Damien Miller33b13562000-04-04 14:38:59 +10001363 c->local_window < c->local_window_max/2 &&
1364 c->local_consumed > 0) {
1365 packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
1366 packet_put_int(c->remote_id);
1367 packet_put_int(c->local_consumed);
1368 packet_send();
Damien Millerd3444942000-09-30 14:20:03 +11001369 debug2("channel %d: window %d sent adjust %d",
Damien Miller33b13562000-04-04 14:38:59 +10001370 c->self, c->local_window,
1371 c->local_consumed);
1372 c->local_window += c->local_consumed;
1373 c->local_consumed = 0;
Damien Millerb38eff82000-04-01 11:09:21 +10001374 }
1375 return 1;
1376}
1377
Ben Lindstrombba81212001-06-25 05:01:22 +00001378static void
Damien Millerde6987c2002-01-22 23:20:40 +11001379channel_post_open(Channel *c, fd_set * readset, fd_set * writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001380{
Damien Miller4623a752001-10-10 15:03:58 +10001381 if (c->delayed)
1382 return;
Damien Millerb38eff82000-04-01 11:09:21 +10001383 channel_handle_rfd(c, readset, writeset);
1384 channel_handle_wfd(c, readset, writeset);
Damien Millerde6987c2002-01-22 23:20:40 +11001385 if (!compat20)
Damien Miller4623a752001-10-10 15:03:58 +10001386 return;
Damien Miller33b13562000-04-04 14:38:59 +10001387 channel_handle_efd(c, readset, writeset);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001388 channel_check_window(c);
Damien Miller33b13562000-04-04 14:38:59 +10001389}
1390
Ben Lindstrombba81212001-06-25 05:01:22 +00001391static void
Damien Millerb38eff82000-04-01 11:09:21 +10001392channel_post_output_drain_13(Channel *c, fd_set * readset, fd_set * writeset)
1393{
1394 int len;
1395 /* Send buffered output data to the socket. */
1396 if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) {
1397 len = write(c->sock, buffer_ptr(&c->output),
1398 buffer_len(&c->output));
1399 if (len <= 0)
Damien Miller76765c02002-01-22 23:21:15 +11001400 buffer_clear(&c->output);
Damien Millerb38eff82000-04-01 11:09:21 +10001401 else
1402 buffer_consume(&c->output, len);
1403 }
1404}
1405
Ben Lindstrombba81212001-06-25 05:01:22 +00001406static void
Damien Miller33b13562000-04-04 14:38:59 +10001407channel_handler_init_20(void)
1408{
Damien Millerde6987c2002-01-22 23:20:40 +11001409 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open;
Damien Millerbd483e72000-04-30 10:00:53 +10001410 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open;
Damien Miller33b13562000-04-04 14:38:59 +10001411 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001412 channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener;
Damien Millerbd483e72000-04-30 10:00:53 +10001413 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001414 channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001415 channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001416 channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
Damien Miller33b13562000-04-04 14:38:59 +10001417
Damien Millerde6987c2002-01-22 23:20:40 +11001418 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open;
Damien Miller33b13562000-04-04 14:38:59 +10001419 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001420 channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener;
Damien Millerbd483e72000-04-30 10:00:53 +10001421 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001422 channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001423 channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
Damien Millerde6987c2002-01-22 23:20:40 +11001424 channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open;
Damien Miller33b13562000-04-04 14:38:59 +10001425}
1426
Ben Lindstrombba81212001-06-25 05:01:22 +00001427static void
Damien Millerb38eff82000-04-01 11:09:21 +10001428channel_handler_init_13(void)
1429{
1430 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13;
1431 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_13;
1432 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
1433 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
1434 channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
1435 channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining;
1436 channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001437 channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001438 channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
Damien Millerb38eff82000-04-01 11:09:21 +10001439
Damien Millerde6987c2002-01-22 23:20:40 +11001440 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open;
Damien Millerb38eff82000-04-01 11:09:21 +10001441 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
1442 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
1443 channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
1444 channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001445 channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
Damien Millerde6987c2002-01-22 23:20:40 +11001446 channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open;
Damien Millerb38eff82000-04-01 11:09:21 +10001447}
1448
Ben Lindstrombba81212001-06-25 05:01:22 +00001449static void
Damien Millerb38eff82000-04-01 11:09:21 +10001450channel_handler_init_15(void)
1451{
Damien Millerde6987c2002-01-22 23:20:40 +11001452 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open;
Damien Millerbd483e72000-04-30 10:00:53 +10001453 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open;
Damien Millerb38eff82000-04-01 11:09:21 +10001454 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
1455 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
1456 channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001457 channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001458 channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
Damien Millerb38eff82000-04-01 11:09:21 +10001459
1460 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
1461 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
1462 channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
Damien Millerde6987c2002-01-22 23:20:40 +11001463 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001464 channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
Damien Millerde6987c2002-01-22 23:20:40 +11001465 channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open;
Damien Millerb38eff82000-04-01 11:09:21 +10001466}
1467
Ben Lindstrombba81212001-06-25 05:01:22 +00001468static void
Damien Millerb38eff82000-04-01 11:09:21 +10001469channel_handler_init(void)
1470{
1471 int i;
Damien Miller9f0f5c62001-12-21 14:45:46 +11001472 for (i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) {
Damien Millerb38eff82000-04-01 11:09:21 +10001473 channel_pre[i] = NULL;
1474 channel_post[i] = NULL;
1475 }
Damien Miller33b13562000-04-04 14:38:59 +10001476 if (compat20)
1477 channel_handler_init_20();
1478 else if (compat13)
Damien Millerb38eff82000-04-01 11:09:21 +10001479 channel_handler_init_13();
1480 else
1481 channel_handler_init_15();
1482}
1483
Damien Miller3ec27592001-10-12 11:35:04 +10001484/* gc dead channels */
1485static void
1486channel_garbage_collect(Channel *c)
1487{
1488 if (c == NULL)
1489 return;
1490 if (c->detach_user != NULL) {
1491 if (!chan_is_dead(c, 0))
1492 return;
1493 debug("channel %d: gc: notify user", c->self);
1494 c->detach_user(c->self, NULL);
1495 /* if we still have a callback */
1496 if (c->detach_user != NULL)
1497 return;
1498 debug("channel %d: gc: user detached", c->self);
1499 }
1500 if (!chan_is_dead(c, 1))
1501 return;
1502 debug("channel %d: garbage collecting", c->self);
1503 channel_free(c);
1504}
1505
Ben Lindstrombba81212001-06-25 05:01:22 +00001506static void
Damien Millerb38eff82000-04-01 11:09:21 +10001507channel_handler(chan_fn *ftab[], fd_set * readset, fd_set * writeset)
1508{
1509 static int did_init = 0;
1510 int i;
1511 Channel *c;
1512
1513 if (!did_init) {
1514 channel_handler_init();
1515 did_init = 1;
1516 }
1517 for (i = 0; i < channels_alloc; i++) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001518 c = channels[i];
1519 if (c == NULL)
Damien Millerb38eff82000-04-01 11:09:21 +10001520 continue;
Ben Lindstromc0dee1a2001-06-05 20:52:50 +00001521 if (ftab[c->type] != NULL)
1522 (*ftab[c->type])(c, readset, writeset);
Damien Miller3ec27592001-10-12 11:35:04 +10001523 channel_garbage_collect(c);
Damien Millerb38eff82000-04-01 11:09:21 +10001524 }
1525}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001526
Ben Lindstrome9c99912001-06-09 00:41:05 +00001527/*
1528 * Allocate/update select bitmasks and add any bits relevant to channels in
1529 * select bitmasks.
1530 */
Damien Miller4af51302000-04-16 11:18:38 +10001531void
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001532channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp,
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001533 int *nallocp, int rekeying)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001534{
Damien Miller5e953212001-01-30 09:14:00 +11001535 int n;
1536 u_int sz;
1537
1538 n = MAX(*maxfdp, channel_max_fd);
1539
1540 sz = howmany(n+1, NFDBITS) * sizeof(fd_mask);
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001541 /* perhaps check sz < nalloc/2 and shrink? */
1542 if (*readsetp == NULL || sz > *nallocp) {
1543 *readsetp = xrealloc(*readsetp, sz);
1544 *writesetp = xrealloc(*writesetp, sz);
1545 *nallocp = sz;
Damien Miller5e953212001-01-30 09:14:00 +11001546 }
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001547 *maxfdp = n;
Damien Miller5e953212001-01-30 09:14:00 +11001548 memset(*readsetp, 0, sz);
1549 memset(*writesetp, 0, sz);
1550
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001551 if (!rekeying)
1552 channel_handler(channel_pre, *readsetp, *writesetp);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001553}
1554
Ben Lindstrome9c99912001-06-09 00:41:05 +00001555/*
1556 * After select, perform any appropriate operations for channels which have
1557 * events pending.
1558 */
Damien Miller4af51302000-04-16 11:18:38 +10001559void
Damien Miller95def091999-11-25 00:26:21 +11001560channel_after_select(fd_set * readset, fd_set * writeset)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001561{
Damien Millerb38eff82000-04-01 11:09:21 +10001562 channel_handler(channel_post, readset, writeset);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001563}
1564
Ben Lindstrome9c99912001-06-09 00:41:05 +00001565
Damien Miller5e953212001-01-30 09:14:00 +11001566/* If there is data to send to the connection, enqueue some of it now. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001567
Damien Miller4af51302000-04-16 11:18:38 +10001568void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00001569channel_output_poll(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001570{
Damien Miller95def091999-11-25 00:26:21 +11001571 int len, i;
Damien Millerb38eff82000-04-01 11:09:21 +10001572 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001573
Damien Miller95def091999-11-25 00:26:21 +11001574 for (i = 0; i < channels_alloc; i++) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001575 c = channels[i];
1576 if (c == NULL)
1577 continue;
Damien Miller34132e52000-01-14 15:45:46 +11001578
Ben Lindstrome9c99912001-06-09 00:41:05 +00001579 /*
1580 * We are only interested in channels that can have buffered
1581 * incoming data.
1582 */
Damien Miller34132e52000-01-14 15:45:46 +11001583 if (compat13) {
Damien Millerb38eff82000-04-01 11:09:21 +10001584 if (c->type != SSH_CHANNEL_OPEN &&
1585 c->type != SSH_CHANNEL_INPUT_DRAINING)
Damien Miller34132e52000-01-14 15:45:46 +11001586 continue;
1587 } else {
Damien Millerb38eff82000-04-01 11:09:21 +10001588 if (c->type != SSH_CHANNEL_OPEN)
Damien Miller34132e52000-01-14 15:45:46 +11001589 continue;
Damien Miller34132e52000-01-14 15:45:46 +11001590 }
Damien Millerefb4afe2000-04-12 18:45:05 +10001591 if (compat20 &&
1592 (c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) {
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001593 /* XXX is this true? */
Damien Miller3ec27592001-10-12 11:35:04 +10001594 debug3("channel %d: will not send data after close", c->self);
Damien Miller33b13562000-04-04 14:38:59 +10001595 continue;
1596 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001597
Damien Miller95def091999-11-25 00:26:21 +11001598 /* Get the amount of buffered data for this channel. */
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001599 if ((c->istate == CHAN_INPUT_OPEN ||
1600 c->istate == CHAN_INPUT_WAIT_DRAIN) &&
1601 (len = buffer_len(&c->input)) > 0) {
Ben Lindstrome9c99912001-06-09 00:41:05 +00001602 /*
1603 * Send some data for the other side over the secure
1604 * connection.
1605 */
Damien Miller33b13562000-04-04 14:38:59 +10001606 if (compat20) {
1607 if (len > c->remote_window)
1608 len = c->remote_window;
1609 if (len > c->remote_maxpacket)
1610 len = c->remote_maxpacket;
Damien Miller95def091999-11-25 00:26:21 +11001611 } else {
Damien Miller33b13562000-04-04 14:38:59 +10001612 if (packet_is_interactive()) {
1613 if (len > 1024)
1614 len = 512;
1615 } else {
1616 /* Keep the packets at reasonable size. */
1617 if (len > packet_get_maxsize()/2)
1618 len = packet_get_maxsize()/2;
1619 }
Damien Miller95def091999-11-25 00:26:21 +11001620 }
Damien Millerb38eff82000-04-01 11:09:21 +10001621 if (len > 0) {
Damien Miller33b13562000-04-04 14:38:59 +10001622 packet_start(compat20 ?
1623 SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA);
Damien Millerb38eff82000-04-01 11:09:21 +10001624 packet_put_int(c->remote_id);
1625 packet_put_string(buffer_ptr(&c->input), len);
1626 packet_send();
1627 buffer_consume(&c->input, len);
1628 c->remote_window -= len;
Damien Millerb38eff82000-04-01 11:09:21 +10001629 }
1630 } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) {
Damien Miller95def091999-11-25 00:26:21 +11001631 if (compat13)
1632 fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3");
Damien Miller5428f641999-11-25 11:54:57 +11001633 /*
1634 * input-buffer is empty and read-socket shutdown:
Ben Lindstromcf159442002-03-26 03:26:24 +00001635 * tell peer, that we will not send more data: send IEOF.
1636 * hack for extended data: delay EOF if EFD still in use.
Damien Miller5428f641999-11-25 11:54:57 +11001637 */
Ben Lindstromcf159442002-03-26 03:26:24 +00001638 if (CHANNEL_EFD_INPUT_ACTIVE(c))
Ben Lindstrom5a6abda2002-06-09 19:41:48 +00001639 debug2("channel %d: ibuf_empty delayed efd %d/(%d)",
1640 c->self, c->efd, buffer_len(&c->extended));
Ben Lindstromcf159442002-03-26 03:26:24 +00001641 else
1642 chan_ibuf_empty(c);
Damien Miller95def091999-11-25 00:26:21 +11001643 }
Damien Miller33b13562000-04-04 14:38:59 +10001644 /* Send extended data, i.e. stderr */
1645 if (compat20 &&
Ben Lindstromcf159442002-03-26 03:26:24 +00001646 !(c->flags & CHAN_EOF_SENT) &&
Damien Miller33b13562000-04-04 14:38:59 +10001647 c->remote_window > 0 &&
1648 (len = buffer_len(&c->extended)) > 0 &&
1649 c->extended_usage == CHAN_EXTENDED_READ) {
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001650 debug2("channel %d: rwin %d elen %d euse %d",
1651 c->self, c->remote_window, buffer_len(&c->extended),
1652 c->extended_usage);
Damien Miller33b13562000-04-04 14:38:59 +10001653 if (len > c->remote_window)
1654 len = c->remote_window;
1655 if (len > c->remote_maxpacket)
1656 len = c->remote_maxpacket;
1657 packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA);
1658 packet_put_int(c->remote_id);
1659 packet_put_int(SSH2_EXTENDED_DATA_STDERR);
1660 packet_put_string(buffer_ptr(&c->extended), len);
1661 packet_send();
1662 buffer_consume(&c->extended, len);
1663 c->remote_window -= len;
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001664 debug2("channel %d: sent ext data %d", c->self, len);
Damien Miller33b13562000-04-04 14:38:59 +10001665 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001666 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001667}
1668
Ben Lindstrome9c99912001-06-09 00:41:05 +00001669
1670/* -- protocol input */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001671
Damien Miller4af51302000-04-16 11:18:38 +10001672void
Damien Miller630d6f42002-01-22 23:17:30 +11001673channel_input_data(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001674{
Damien Miller34132e52000-01-14 15:45:46 +11001675 int id;
Damien Miller95def091999-11-25 00:26:21 +11001676 char *data;
Ben Lindstrom46c16222000-12-22 01:43:59 +00001677 u_int data_len;
Damien Millerb38eff82000-04-01 11:09:21 +10001678 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001679
Damien Miller95def091999-11-25 00:26:21 +11001680 /* Get the channel number and verify it. */
Damien Miller34132e52000-01-14 15:45:46 +11001681 id = packet_get_int();
Damien Millerb38eff82000-04-01 11:09:21 +10001682 c = channel_lookup(id);
1683 if (c == NULL)
Damien Miller34132e52000-01-14 15:45:46 +11001684 packet_disconnect("Received data for nonexistent channel %d.", id);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001685
Damien Miller95def091999-11-25 00:26:21 +11001686 /* Ignore any data for non-open channels (might happen on close) */
Damien Millerb38eff82000-04-01 11:09:21 +10001687 if (c->type != SSH_CHANNEL_OPEN &&
1688 c->type != SSH_CHANNEL_X11_OPEN)
Damien Miller34132e52000-01-14 15:45:46 +11001689 return;
1690
1691 /* same for protocol 1.5 if output end is no longer open */
Damien Millerb38eff82000-04-01 11:09:21 +10001692 if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN)
Damien Miller95def091999-11-25 00:26:21 +11001693 return;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001694
Damien Miller95def091999-11-25 00:26:21 +11001695 /* Get the data. */
1696 data = packet_get_string(&data_len);
Damien Millerb38eff82000-04-01 11:09:21 +10001697
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00001698 if (compat20) {
Damien Miller33b13562000-04-04 14:38:59 +10001699 if (data_len > c->local_maxpacket) {
1700 log("channel %d: rcvd big packet %d, maxpack %d",
1701 c->self, data_len, c->local_maxpacket);
1702 }
1703 if (data_len > c->local_window) {
1704 log("channel %d: rcvd too much data %d, win %d",
1705 c->self, data_len, c->local_window);
1706 xfree(data);
1707 return;
1708 }
1709 c->local_window -= data_len;
Damien Miller33b13562000-04-04 14:38:59 +10001710 }
Damien Miller48b03fc2002-01-22 23:11:40 +11001711 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10001712 buffer_append(&c->output, data, data_len);
Damien Miller95def091999-11-25 00:26:21 +11001713 xfree(data);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001714}
Ben Lindstrome9c99912001-06-09 00:41:05 +00001715
Damien Miller4af51302000-04-16 11:18:38 +10001716void
Damien Miller630d6f42002-01-22 23:17:30 +11001717channel_input_extended_data(int type, u_int32_t seq, void *ctxt)
Damien Miller33b13562000-04-04 14:38:59 +10001718{
1719 int id;
1720 int tcode;
1721 char *data;
Ben Lindstrom46c16222000-12-22 01:43:59 +00001722 u_int data_len;
Damien Miller33b13562000-04-04 14:38:59 +10001723 Channel *c;
1724
1725 /* Get the channel number and verify it. */
1726 id = packet_get_int();
1727 c = channel_lookup(id);
1728
1729 if (c == NULL)
1730 packet_disconnect("Received extended_data for bad channel %d.", id);
1731 if (c->type != SSH_CHANNEL_OPEN) {
1732 log("channel %d: ext data for non open", id);
1733 return;
1734 }
Ben Lindstromcf159442002-03-26 03:26:24 +00001735 if (c->flags & CHAN_EOF_RCVD) {
1736 if (datafellows & SSH_BUG_EXTEOF)
1737 debug("channel %d: accepting ext data after eof", id);
1738 else
1739 packet_disconnect("Received extended_data after EOF "
1740 "on channel %d.", id);
1741 }
Damien Miller33b13562000-04-04 14:38:59 +10001742 tcode = packet_get_int();
1743 if (c->efd == -1 ||
1744 c->extended_usage != CHAN_EXTENDED_WRITE ||
1745 tcode != SSH2_EXTENDED_DATA_STDERR) {
1746 log("channel %d: bad ext data", c->self);
1747 return;
1748 }
1749 data = packet_get_string(&data_len);
Damien Miller48b03fc2002-01-22 23:11:40 +11001750 packet_check_eom();
Damien Miller33b13562000-04-04 14:38:59 +10001751 if (data_len > c->local_window) {
1752 log("channel %d: rcvd too much extended_data %d, win %d",
1753 c->self, data_len, c->local_window);
1754 xfree(data);
1755 return;
1756 }
Damien Millerd3444942000-09-30 14:20:03 +11001757 debug2("channel %d: rcvd ext data %d", c->self, data_len);
Damien Miller33b13562000-04-04 14:38:59 +10001758 c->local_window -= data_len;
1759 buffer_append(&c->extended, data, data_len);
1760 xfree(data);
1761}
1762
Damien Miller4af51302000-04-16 11:18:38 +10001763void
Damien Miller630d6f42002-01-22 23:17:30 +11001764channel_input_ieof(int type, u_int32_t seq, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10001765{
1766 int id;
1767 Channel *c;
1768
Damien Millerb38eff82000-04-01 11:09:21 +10001769 id = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11001770 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10001771 c = channel_lookup(id);
1772 if (c == NULL)
1773 packet_disconnect("Received ieof for nonexistent channel %d.", id);
1774 chan_rcvd_ieof(c);
Ben Lindstrom944c4f02001-09-18 05:51:13 +00001775
1776 /* XXX force input close */
Damien Millera90fc082002-01-22 23:19:38 +11001777 if (c->force_drain && c->istate == CHAN_INPUT_OPEN) {
Ben Lindstrom944c4f02001-09-18 05:51:13 +00001778 debug("channel %d: FORCE input drain", c->self);
1779 c->istate = CHAN_INPUT_WAIT_DRAIN;
Damien Miller73f10742002-01-22 23:34:52 +11001780 if (buffer_len(&c->input) == 0)
1781 chan_ibuf_empty(c);
Ben Lindstrom944c4f02001-09-18 05:51:13 +00001782 }
1783
Damien Millerb38eff82000-04-01 11:09:21 +10001784}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001785
Damien Miller4af51302000-04-16 11:18:38 +10001786void
Damien Miller630d6f42002-01-22 23:17:30 +11001787channel_input_close(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001788{
Damien Millerb38eff82000-04-01 11:09:21 +10001789 int id;
1790 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001791
Damien Millerb38eff82000-04-01 11:09:21 +10001792 id = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11001793 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10001794 c = channel_lookup(id);
1795 if (c == NULL)
1796 packet_disconnect("Received close for nonexistent channel %d.", id);
Damien Miller5428f641999-11-25 11:54:57 +11001797
1798 /*
1799 * Send a confirmation that we have closed the channel and no more
1800 * data is coming for it.
1801 */
Damien Miller95def091999-11-25 00:26:21 +11001802 packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION);
Damien Millerb38eff82000-04-01 11:09:21 +10001803 packet_put_int(c->remote_id);
Damien Miller95def091999-11-25 00:26:21 +11001804 packet_send();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001805
Damien Miller5428f641999-11-25 11:54:57 +11001806 /*
1807 * If the channel is in closed state, we have sent a close request,
1808 * and the other side will eventually respond with a confirmation.
1809 * Thus, we cannot free the channel here, because then there would be
1810 * no-one to receive the confirmation. The channel gets freed when
1811 * the confirmation arrives.
1812 */
Damien Millerb38eff82000-04-01 11:09:21 +10001813 if (c->type != SSH_CHANNEL_CLOSED) {
Damien Miller5428f641999-11-25 11:54:57 +11001814 /*
1815 * Not a closed channel - mark it as draining, which will
1816 * cause it to be freed later.
1817 */
Damien Miller76765c02002-01-22 23:21:15 +11001818 buffer_clear(&c->input);
Damien Millerb38eff82000-04-01 11:09:21 +10001819 c->type = SSH_CHANNEL_OUTPUT_DRAINING;
Damien Miller95def091999-11-25 00:26:21 +11001820 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001821}
1822
Damien Millerb38eff82000-04-01 11:09:21 +10001823/* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */
Damien Miller4af51302000-04-16 11:18:38 +10001824void
Damien Miller630d6f42002-01-22 23:17:30 +11001825channel_input_oclose(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001826{
Damien Millerb38eff82000-04-01 11:09:21 +10001827 int id = packet_get_int();
1828 Channel *c = channel_lookup(id);
Damien Miller66823cd2002-01-22 23:11:38 +11001829
Damien Miller48b03fc2002-01-22 23:11:40 +11001830 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10001831 if (c == NULL)
1832 packet_disconnect("Received oclose for nonexistent channel %d.", id);
1833 chan_rcvd_oclose(c);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001834}
1835
Damien Miller4af51302000-04-16 11:18:38 +10001836void
Damien Miller630d6f42002-01-22 23:17:30 +11001837channel_input_close_confirmation(int type, u_int32_t seq, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10001838{
1839 int id = packet_get_int();
1840 Channel *c = channel_lookup(id);
1841
Damien Miller48b03fc2002-01-22 23:11:40 +11001842 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10001843 if (c == NULL)
1844 packet_disconnect("Received close confirmation for "
1845 "out-of-range channel %d.", id);
1846 if (c->type != SSH_CHANNEL_CLOSED)
1847 packet_disconnect("Received close confirmation for "
1848 "non-closed channel %d (type %d).", id, c->type);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001849 channel_free(c);
Damien Millerb38eff82000-04-01 11:09:21 +10001850}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001851
Damien Miller4af51302000-04-16 11:18:38 +10001852void
Damien Miller630d6f42002-01-22 23:17:30 +11001853channel_input_open_confirmation(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001854{
Damien Millerb38eff82000-04-01 11:09:21 +10001855 int id, remote_id;
1856 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001857
Damien Millerb38eff82000-04-01 11:09:21 +10001858 id = packet_get_int();
1859 c = channel_lookup(id);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001860
Damien Millerb38eff82000-04-01 11:09:21 +10001861 if (c==NULL || c->type != SSH_CHANNEL_OPENING)
1862 packet_disconnect("Received open confirmation for "
1863 "non-opening channel %d.", id);
1864 remote_id = packet_get_int();
Damien Miller5428f641999-11-25 11:54:57 +11001865 /* Record the remote channel number and mark that the channel is now open. */
Damien Millerb38eff82000-04-01 11:09:21 +10001866 c->remote_id = remote_id;
1867 c->type = SSH_CHANNEL_OPEN;
Damien Miller33b13562000-04-04 14:38:59 +10001868
1869 if (compat20) {
1870 c->remote_window = packet_get_int();
1871 c->remote_maxpacket = packet_get_int();
Damien Miller67f0bc02002-02-05 12:23:08 +11001872 if (c->confirm) {
Damien Millerd3444942000-09-30 14:20:03 +11001873 debug2("callback start");
Damien Miller67f0bc02002-02-05 12:23:08 +11001874 c->confirm(c->self, NULL);
Damien Millerd3444942000-09-30 14:20:03 +11001875 debug2("callback done");
Damien Miller33b13562000-04-04 14:38:59 +10001876 }
1877 debug("channel %d: open confirm rwindow %d rmax %d", c->self,
1878 c->remote_window, c->remote_maxpacket);
1879 }
Damien Miller48b03fc2002-01-22 23:11:40 +11001880 packet_check_eom();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001881}
1882
Ben Lindstrombba81212001-06-25 05:01:22 +00001883static char *
Ben Lindstrom69128662001-05-08 20:07:39 +00001884reason2txt(int reason)
1885{
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00001886 switch (reason) {
Ben Lindstrom69128662001-05-08 20:07:39 +00001887 case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED:
1888 return "administratively prohibited";
1889 case SSH2_OPEN_CONNECT_FAILED:
1890 return "connect failed";
1891 case SSH2_OPEN_UNKNOWN_CHANNEL_TYPE:
1892 return "unknown channel type";
1893 case SSH2_OPEN_RESOURCE_SHORTAGE:
1894 return "resource shortage";
1895 }
Ben Lindstrome2595442001-06-05 20:01:39 +00001896 return "unknown reason";
Ben Lindstrom69128662001-05-08 20:07:39 +00001897}
1898
Damien Miller4af51302000-04-16 11:18:38 +10001899void
Damien Miller630d6f42002-01-22 23:17:30 +11001900channel_input_open_failure(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001901{
Kevin Steves12057502001-02-05 14:54:34 +00001902 int id, reason;
1903 char *msg = NULL, *lang = NULL;
Damien Millerb38eff82000-04-01 11:09:21 +10001904 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001905
Damien Millerb38eff82000-04-01 11:09:21 +10001906 id = packet_get_int();
1907 c = channel_lookup(id);
1908
1909 if (c==NULL || c->type != SSH_CHANNEL_OPENING)
1910 packet_disconnect("Received open failure for "
1911 "non-opening channel %d.", id);
Damien Miller33b13562000-04-04 14:38:59 +10001912 if (compat20) {
Kevin Steves12057502001-02-05 14:54:34 +00001913 reason = packet_get_int();
Ben Lindstromf3436742001-04-29 19:52:00 +00001914 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
Kevin Steves12057502001-02-05 14:54:34 +00001915 msg = packet_get_string(NULL);
1916 lang = packet_get_string(NULL);
1917 }
Ben Lindstrom69128662001-05-08 20:07:39 +00001918 log("channel %d: open failed: %s%s%s", id,
1919 reason2txt(reason), msg ? ": ": "", msg ? msg : "");
Kevin Steves12057502001-02-05 14:54:34 +00001920 if (msg != NULL)
1921 xfree(msg);
1922 if (lang != NULL)
1923 xfree(lang);
Damien Miller33b13562000-04-04 14:38:59 +10001924 }
Damien Miller48b03fc2002-01-22 23:11:40 +11001925 packet_check_eom();
Damien Miller95def091999-11-25 00:26:21 +11001926 /* Free the channel. This will also close the socket. */
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001927 channel_free(c);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001928}
1929
Damien Miller33b13562000-04-04 14:38:59 +10001930void
Damien Miller630d6f42002-01-22 23:17:30 +11001931channel_input_window_adjust(int type, u_int32_t seq, void *ctxt)
Damien Miller33b13562000-04-04 14:38:59 +10001932{
1933 Channel *c;
1934 int id, adjust;
1935
1936 if (!compat20)
1937 return;
1938
1939 /* Get the channel number and verify it. */
1940 id = packet_get_int();
1941 c = channel_lookup(id);
1942
1943 if (c == NULL || c->type != SSH_CHANNEL_OPEN) {
1944 log("Received window adjust for "
1945 "non-open channel %d.", id);
1946 return;
1947 }
1948 adjust = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11001949 packet_check_eom();
Damien Millerd3444942000-09-30 14:20:03 +11001950 debug2("channel %d: rcvd adjust %d", id, adjust);
Damien Miller33b13562000-04-04 14:38:59 +10001951 c->remote_window += adjust;
1952}
1953
Damien Miller4af51302000-04-16 11:18:38 +10001954void
Damien Miller630d6f42002-01-22 23:17:30 +11001955channel_input_port_open(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001956{
Ben Lindstrome9c99912001-06-09 00:41:05 +00001957 Channel *c = NULL;
1958 u_short host_port;
1959 char *host, *originator_string;
1960 int remote_id, sock = -1;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001961
Ben Lindstrome9c99912001-06-09 00:41:05 +00001962 remote_id = packet_get_int();
1963 host = packet_get_string(NULL);
1964 host_port = packet_get_int();
1965
1966 if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) {
1967 originator_string = packet_get_string(NULL);
1968 } else {
1969 originator_string = xstrdup("unknown (remote did not supply name)");
1970 }
Damien Miller48b03fc2002-01-22 23:11:40 +11001971 packet_check_eom();
Ben Lindstrome9c99912001-06-09 00:41:05 +00001972 sock = channel_connect_to(host, host_port);
1973 if (sock != -1) {
1974 c = channel_new("connected socket",
1975 SSH_CHANNEL_CONNECTING, sock, sock, -1, 0, 0, 0,
1976 originator_string, 1);
Damien Miller699d0032002-02-08 22:07:16 +11001977 c->remote_id = remote_id;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001978 }
Ben Lindstrome9c99912001-06-09 00:41:05 +00001979 if (c == NULL) {
1980 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1981 packet_put_int(remote_id);
1982 packet_send();
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001983 }
Ben Lindstrome9c99912001-06-09 00:41:05 +00001984 xfree(host);
Ben Lindstrom5744dc42001-04-13 23:28:01 +00001985}
1986
1987
Ben Lindstrome9c99912001-06-09 00:41:05 +00001988/* -- tcp forwarding */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001989
Ben Lindstrom908afed2001-10-03 17:34:59 +00001990void
1991channel_set_af(int af)
1992{
1993 IPv4or6 = af;
1994}
1995
Damien Millerb16461c2002-01-22 23:29:22 +11001996static int
1997channel_setup_fwd_listener(int type, const char *listen_addr, u_short listen_port,
1998 const char *host_to_connect, u_short port_to_connect, int gateway_ports)
Damien Miller0bc1bd82000-11-13 22:57:25 +11001999{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002000 Channel *c;
Damien Millerb16461c2002-01-22 23:29:22 +11002001 int success, sock, on = 1;
Damien Miller34132e52000-01-14 15:45:46 +11002002 struct addrinfo hints, *ai, *aitop;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002003 const char *host;
Damien Millerb16461c2002-01-22 23:29:22 +11002004 char ntop[NI_MAXHOST], strport[NI_MAXSERV];
Damien Miller5428f641999-11-25 11:54:57 +11002005 struct linger linger;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002006
Kevin Steves12057502001-02-05 14:54:34 +00002007 success = 0;
Damien Millerb16461c2002-01-22 23:29:22 +11002008 host = (type == SSH_CHANNEL_RPORT_LISTENER) ?
2009 listen_addr : host_to_connect;
Kevin Steves12057502001-02-05 14:54:34 +00002010
Damien Millerb16461c2002-01-22 23:29:22 +11002011 if (host == NULL) {
2012 error("No forward host name.");
2013 return success;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002014 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002015 if (strlen(host) > SSH_CHANNEL_PATH_LEN - 1) {
Kevin Steves12057502001-02-05 14:54:34 +00002016 error("Forward host name too long.");
2017 return success;
2018 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002019
Damien Miller5428f641999-11-25 11:54:57 +11002020 /*
Damien Miller34132e52000-01-14 15:45:46 +11002021 * getaddrinfo returns a loopback address if the hostname is
2022 * set to NULL and hints.ai_flags is not AI_PASSIVE
Damien Miller5428f641999-11-25 11:54:57 +11002023 */
Damien Miller34132e52000-01-14 15:45:46 +11002024 memset(&hints, 0, sizeof(hints));
2025 hints.ai_family = IPv4or6;
2026 hints.ai_flags = gateway_ports ? AI_PASSIVE : 0;
2027 hints.ai_socktype = SOCK_STREAM;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002028 snprintf(strport, sizeof strport, "%d", listen_port);
Damien Miller34132e52000-01-14 15:45:46 +11002029 if (getaddrinfo(NULL, strport, &hints, &aitop) != 0)
2030 packet_disconnect("getaddrinfo: fatal error");
Damien Miller5428f641999-11-25 11:54:57 +11002031
Damien Miller34132e52000-01-14 15:45:46 +11002032 for (ai = aitop; ai; ai = ai->ai_next) {
2033 if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
2034 continue;
2035 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop),
2036 strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
Damien Millerb16461c2002-01-22 23:29:22 +11002037 error("channel_setup_fwd_listener: getnameinfo failed");
Damien Miller34132e52000-01-14 15:45:46 +11002038 continue;
2039 }
2040 /* Create a port to listen for the host. */
2041 sock = socket(ai->ai_family, SOCK_STREAM, 0);
2042 if (sock < 0) {
2043 /* this is no error since kernel may not support ipv6 */
2044 verbose("socket: %.100s", strerror(errno));
2045 continue;
2046 }
2047 /*
2048 * Set socket options. We would like the socket to disappear
2049 * as soon as it has been closed for whatever reason.
2050 */
Ben Lindstrom733a2352002-03-05 01:31:28 +00002051 setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
Damien Miller34132e52000-01-14 15:45:46 +11002052 linger.l_onoff = 1;
2053 linger.l_linger = 5;
Ben Lindstrom733a2352002-03-05 01:31:28 +00002054 setsockopt(sock, SOL_SOCKET, SO_LINGER, &linger, sizeof(linger));
Damien Miller34132e52000-01-14 15:45:46 +11002055 debug("Local forwarding listening on %s port %s.", ntop, strport);
Damien Miller95def091999-11-25 00:26:21 +11002056
Damien Miller34132e52000-01-14 15:45:46 +11002057 /* Bind the socket to the address. */
2058 if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
2059 /* address can be in use ipv6 address is already bound */
Damien Miller3c7eeb22000-03-03 22:35:33 +11002060 if (!ai->ai_next)
2061 error("bind: %.100s", strerror(errno));
2062 else
2063 verbose("bind: %.100s", strerror(errno));
Kevin Stevesef4eea92001-02-05 12:42:17 +00002064
Damien Miller34132e52000-01-14 15:45:46 +11002065 close(sock);
2066 continue;
2067 }
2068 /* Start listening for connections on the socket. */
2069 if (listen(sock, 5) < 0) {
2070 error("listen: %.100s", strerror(errno));
2071 close(sock);
2072 continue;
2073 }
2074 /* Allocate a channel number for the socket. */
Ben Lindstrome9c99912001-06-09 00:41:05 +00002075 c = channel_new("port listener", type, sock, sock, -1,
Damien Millerbd483e72000-04-30 10:00:53 +10002076 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
Damien Miller69b69aa2000-10-28 14:19:58 +11002077 0, xstrdup("port listener"), 1);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002078 strlcpy(c->path, host, sizeof(c->path));
2079 c->host_port = port_to_connect;
2080 c->listening_port = listen_port;
Damien Miller34132e52000-01-14 15:45:46 +11002081 success = 1;
2082 }
2083 if (success == 0)
Damien Millerb16461c2002-01-22 23:29:22 +11002084 error("channel_setup_fwd_listener: cannot listen to port: %d",
Kevin Steves12057502001-02-05 14:54:34 +00002085 listen_port);
Damien Miller34132e52000-01-14 15:45:46 +11002086 freeaddrinfo(aitop);
Kevin Steves12057502001-02-05 14:54:34 +00002087 return success;
Damien Miller95def091999-11-25 00:26:21 +11002088}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002089
Damien Millerb16461c2002-01-22 23:29:22 +11002090/* protocol local port fwd, used by ssh (and sshd in v1) */
2091int
2092channel_setup_local_fwd_listener(u_short listen_port,
2093 const char *host_to_connect, u_short port_to_connect, int gateway_ports)
2094{
2095 return channel_setup_fwd_listener(SSH_CHANNEL_PORT_LISTENER,
2096 NULL, listen_port, host_to_connect, port_to_connect, gateway_ports);
2097}
2098
2099/* protocol v2 remote port fwd, used by sshd */
2100int
2101channel_setup_remote_fwd_listener(const char *listen_address,
2102 u_short listen_port, int gateway_ports)
2103{
2104 return channel_setup_fwd_listener(SSH_CHANNEL_RPORT_LISTENER,
2105 listen_address, listen_port, NULL, 0, gateway_ports);
2106}
2107
Damien Miller5428f641999-11-25 11:54:57 +11002108/*
2109 * Initiate forwarding of connections to port "port" on remote host through
2110 * the secure channel to host:port from local side.
2111 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002112
Damien Miller4af51302000-04-16 11:18:38 +10002113void
Damien Miller0bc1bd82000-11-13 22:57:25 +11002114channel_request_remote_forwarding(u_short listen_port,
2115 const char *host_to_connect, u_short port_to_connect)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002116{
Damien Millerdff50992002-01-22 23:16:32 +11002117 int type, success = 0;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002118
Damien Miller95def091999-11-25 00:26:21 +11002119 /* Record locally that connection to this host/port is permitted. */
2120 if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION)
2121 fatal("channel_request_remote_forwarding: too many forwards");
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002122
Damien Miller95def091999-11-25 00:26:21 +11002123 /* Send the forward request to the remote side. */
Damien Miller33b13562000-04-04 14:38:59 +10002124 if (compat20) {
2125 const char *address_to_bind = "0.0.0.0";
2126 packet_start(SSH2_MSG_GLOBAL_REQUEST);
2127 packet_put_cstring("tcpip-forward");
Damien Miller2797f7f2002-04-23 21:09:44 +10002128 packet_put_char(1); /* boolean: want reply */
Damien Miller33b13562000-04-04 14:38:59 +10002129 packet_put_cstring(address_to_bind);
2130 packet_put_int(listen_port);
Damien Miller0bc1bd82000-11-13 22:57:25 +11002131 packet_send();
2132 packet_write_wait();
2133 /* Assume that server accepts the request */
2134 success = 1;
Damien Miller33b13562000-04-04 14:38:59 +10002135 } else {
2136 packet_start(SSH_CMSG_PORT_FORWARD_REQUEST);
Damien Miller33b13562000-04-04 14:38:59 +10002137 packet_put_int(listen_port);
Damien Miller8bb73be2000-04-19 16:26:12 +10002138 packet_put_cstring(host_to_connect);
2139 packet_put_int(port_to_connect);
Damien Miller33b13562000-04-04 14:38:59 +10002140 packet_send();
2141 packet_write_wait();
Damien Miller0bc1bd82000-11-13 22:57:25 +11002142
2143 /* Wait for response from the remote side. */
Damien Millerdff50992002-01-22 23:16:32 +11002144 type = packet_read();
Damien Miller0bc1bd82000-11-13 22:57:25 +11002145 switch (type) {
2146 case SSH_SMSG_SUCCESS:
2147 success = 1;
2148 break;
2149 case SSH_SMSG_FAILURE:
2150 log("Warning: Server denied remote port forwarding.");
2151 break;
2152 default:
2153 /* Unknown packet */
2154 packet_disconnect("Protocol error for port forward request:"
2155 "received packet type %d.", type);
2156 }
2157 }
2158 if (success) {
2159 permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host_to_connect);
2160 permitted_opens[num_permitted_opens].port_to_connect = port_to_connect;
2161 permitted_opens[num_permitted_opens].listen_port = listen_port;
2162 num_permitted_opens++;
Damien Miller33b13562000-04-04 14:38:59 +10002163 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002164}
2165
Damien Miller5428f641999-11-25 11:54:57 +11002166/*
2167 * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates
2168 * listening for the port, and sends back a success reply (or disconnect
2169 * message if there was an error). This never returns if there was an error.
2170 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002171
Damien Miller4af51302000-04-16 11:18:38 +10002172void
Damien Millere247cc42000-05-07 12:03:14 +10002173channel_input_port_forward_request(int is_root, int gateway_ports)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002174{
Damien Milleraae6c611999-12-06 11:47:28 +11002175 u_short port, host_port;
Damien Miller95def091999-11-25 00:26:21 +11002176 char *hostname;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002177
Damien Miller95def091999-11-25 00:26:21 +11002178 /* Get arguments from the packet. */
2179 port = packet_get_int();
2180 hostname = packet_get_string(NULL);
2181 host_port = packet_get_int();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002182
Damien Millerbac2d8a2000-09-05 16:13:06 +11002183#ifndef HAVE_CYGWIN
Damien Miller5428f641999-11-25 11:54:57 +11002184 /*
2185 * Check that an unprivileged user is not trying to forward a
2186 * privileged port.
2187 */
Damien Miller95def091999-11-25 00:26:21 +11002188 if (port < IPPORT_RESERVED && !is_root)
2189 packet_disconnect("Requested forwarding of port %d but user is not root.",
2190 port);
Damien Millerbac2d8a2000-09-05 16:13:06 +11002191#endif
Damien Miller0bc1bd82000-11-13 22:57:25 +11002192 /* Initiate forwarding */
Damien Millerb16461c2002-01-22 23:29:22 +11002193 channel_setup_local_fwd_listener(port, hostname, host_port, gateway_ports);
Damien Miller95def091999-11-25 00:26:21 +11002194
2195 /* Free the argument string. */
2196 xfree(hostname);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002197}
2198
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002199/*
2200 * Permits opening to any host/port if permitted_opens[] is empty. This is
2201 * usually called by the server, because the user could connect to any port
2202 * anyway, and the server has no way to know but to trust the client anyway.
2203 */
2204void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00002205channel_permit_all_opens(void)
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002206{
2207 if (num_permitted_opens == 0)
2208 all_opens_permitted = 1;
2209}
2210
Ben Lindstroma3700052001-04-05 23:26:32 +00002211void
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002212channel_add_permitted_opens(char *host, int port)
2213{
2214 if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION)
2215 fatal("channel_request_remote_forwarding: too many forwards");
2216 debug("allow port forwarding to host %s port %d", host, port);
2217
2218 permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host);
2219 permitted_opens[num_permitted_opens].port_to_connect = port;
2220 num_permitted_opens++;
2221
2222 all_opens_permitted = 0;
2223}
2224
Ben Lindstroma3700052001-04-05 23:26:32 +00002225void
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002226channel_clear_permitted_opens(void)
2227{
2228 int i;
2229
2230 for (i = 0; i < num_permitted_opens; i++)
2231 xfree(permitted_opens[i].host_to_connect);
2232 num_permitted_opens = 0;
2233
2234}
2235
2236
2237/* return socket to remote host, port */
Ben Lindstrombba81212001-06-25 05:01:22 +00002238static int
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002239connect_to(const char *host, u_short port)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002240{
Damien Miller34132e52000-01-14 15:45:46 +11002241 struct addrinfo hints, *ai, *aitop;
2242 char ntop[NI_MAXHOST], strport[NI_MAXSERV];
2243 int gaierr;
Damien Millerb38eff82000-04-01 11:09:21 +10002244 int sock = -1;
Damien Miller95def091999-11-25 00:26:21 +11002245
Damien Miller34132e52000-01-14 15:45:46 +11002246 memset(&hints, 0, sizeof(hints));
2247 hints.ai_family = IPv4or6;
2248 hints.ai_socktype = SOCK_STREAM;
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002249 snprintf(strport, sizeof strport, "%d", port);
Damien Miller34132e52000-01-14 15:45:46 +11002250 if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) {
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002251 error("connect_to %.100s: unknown host (%s)", host,
2252 gai_strerror(gaierr));
Damien Millerb38eff82000-04-01 11:09:21 +10002253 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002254 }
Damien Miller34132e52000-01-14 15:45:46 +11002255 for (ai = aitop; ai; ai = ai->ai_next) {
2256 if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
2257 continue;
2258 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop),
2259 strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002260 error("connect_to: getnameinfo failed");
Damien Miller34132e52000-01-14 15:45:46 +11002261 continue;
2262 }
Damien Miller34132e52000-01-14 15:45:46 +11002263 sock = socket(ai->ai_family, SOCK_STREAM, 0);
2264 if (sock < 0) {
2265 error("socket: %.100s", strerror(errno));
2266 continue;
2267 }
Ben Lindstrom48bd7c12001-01-09 00:35:42 +00002268 if (fcntl(sock, F_SETFL, O_NONBLOCK) < 0)
Ben Lindstrom7ad97102000-12-06 01:42:49 +00002269 fatal("connect_to: F_SETFL: %s", strerror(errno));
Ben Lindstrom7ad97102000-12-06 01:42:49 +00002270 if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0 &&
2271 errno != EINPROGRESS) {
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002272 error("connect_to %.100s port %s: %.100s", ntop, strport,
Damien Miller34132e52000-01-14 15:45:46 +11002273 strerror(errno));
2274 close(sock);
Kevin Stevesef4eea92001-02-05 12:42:17 +00002275 continue; /* fail -- try next */
Damien Miller34132e52000-01-14 15:45:46 +11002276 }
2277 break; /* success */
2278
2279 }
2280 freeaddrinfo(aitop);
Damien Miller34132e52000-01-14 15:45:46 +11002281 if (!ai) {
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002282 error("connect_to %.100s port %d: failed.", host, port);
Damien Millerb38eff82000-04-01 11:09:21 +10002283 return -1;
2284 }
2285 /* success */
Ben Lindstrom1ebd7a52002-02-26 18:12:51 +00002286 set_nodelay(sock);
Damien Millerb38eff82000-04-01 11:09:21 +10002287 return sock;
2288}
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002289
Damien Miller0bc1bd82000-11-13 22:57:25 +11002290int
Ben Lindstrom173e6462001-07-04 05:15:15 +00002291channel_connect_by_listen_address(u_short listen_port)
Damien Miller0bc1bd82000-11-13 22:57:25 +11002292{
2293 int i;
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002294
Damien Miller0bc1bd82000-11-13 22:57:25 +11002295 for (i = 0; i < num_permitted_opens; i++)
2296 if (permitted_opens[i].listen_port == listen_port)
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002297 return connect_to(
Damien Miller0bc1bd82000-11-13 22:57:25 +11002298 permitted_opens[i].host_to_connect,
2299 permitted_opens[i].port_to_connect);
Ben Lindstromc72745a2000-12-02 19:03:54 +00002300 error("WARNING: Server requests forwarding for unknown listen_port %d",
2301 listen_port);
Damien Miller0bc1bd82000-11-13 22:57:25 +11002302 return -1;
2303}
Damien Millerb38eff82000-04-01 11:09:21 +10002304
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002305/* Check if connecting to that port is permitted and connect. */
2306int
2307channel_connect_to(const char *host, u_short port)
2308{
2309 int i, permit;
2310
2311 permit = all_opens_permitted;
2312 if (!permit) {
2313 for (i = 0; i < num_permitted_opens; i++)
2314 if (permitted_opens[i].port_to_connect == port &&
2315 strcmp(permitted_opens[i].host_to_connect, host) == 0)
2316 permit = 1;
2317
2318 }
2319 if (!permit) {
2320 log("Received request to connect to host %.100s port %d, "
2321 "but the request was denied.", host, port);
2322 return -1;
2323 }
2324 return connect_to(host, port);
2325}
2326
Ben Lindstrome9c99912001-06-09 00:41:05 +00002327/* -- X11 forwarding */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002328
Damien Miller5428f641999-11-25 11:54:57 +11002329/*
2330 * Creates an internet domain socket for listening for X11 connections.
Kevin Steves366298c2001-12-19 17:58:01 +00002331 * Returns a suitable display number for the DISPLAY variable, or -1 if
2332 * an error occurs.
Damien Miller5428f641999-11-25 11:54:57 +11002333 */
Kevin Steves366298c2001-12-19 17:58:01 +00002334int
Damien Miller95c249f2002-02-05 12:11:34 +11002335x11_create_display_inet(int x11_display_offset, int x11_use_localhost,
Damien Millere7378562001-12-21 14:58:35 +11002336 int single_connection)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002337{
Damien Millere7378562001-12-21 14:58:35 +11002338 Channel *nc = NULL;
Damien Milleraae6c611999-12-06 11:47:28 +11002339 int display_number, sock;
2340 u_short port;
Damien Miller34132e52000-01-14 15:45:46 +11002341 struct addrinfo hints, *ai, *aitop;
2342 char strport[NI_MAXSERV];
2343 int gaierr, n, num_socks = 0, socks[NUM_SOCKS];
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002344
Damien Millera34a28b1999-12-14 10:47:15 +11002345 for (display_number = x11_display_offset;
Damien Miller9f0f5c62001-12-21 14:45:46 +11002346 display_number < MAX_DISPLAYS;
2347 display_number++) {
Damien Miller95def091999-11-25 00:26:21 +11002348 port = 6000 + display_number;
Damien Miller34132e52000-01-14 15:45:46 +11002349 memset(&hints, 0, sizeof(hints));
2350 hints.ai_family = IPv4or6;
Damien Miller95c249f2002-02-05 12:11:34 +11002351 hints.ai_flags = x11_use_localhost ? 0: AI_PASSIVE;
Damien Miller34132e52000-01-14 15:45:46 +11002352 hints.ai_socktype = SOCK_STREAM;
2353 snprintf(strport, sizeof strport, "%d", port);
2354 if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) {
2355 error("getaddrinfo: %.100s", gai_strerror(gaierr));
Kevin Steves366298c2001-12-19 17:58:01 +00002356 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002357 }
Damien Miller34132e52000-01-14 15:45:46 +11002358 for (ai = aitop; ai; ai = ai->ai_next) {
2359 if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
2360 continue;
2361 sock = socket(ai->ai_family, SOCK_STREAM, 0);
2362 if (sock < 0) {
Damien Miller89d97962000-10-14 12:37:19 +11002363 if ((errno != EINVAL) && (errno != EAFNOSUPPORT)) {
Damien Millere2192732000-01-17 13:22:55 +11002364 error("socket: %.100s", strerror(errno));
Kevin Steves366298c2001-12-19 17:58:01 +00002365 return -1;
Damien Millere2192732000-01-17 13:22:55 +11002366 } else {
Damien Millercb5e44a2000-09-29 12:12:36 +11002367 debug("x11_create_display_inet: Socket family %d not supported",
2368 ai->ai_family);
Damien Millere2192732000-01-17 13:22:55 +11002369 continue;
2370 }
Damien Miller34132e52000-01-14 15:45:46 +11002371 }
Kevin Stevesdf75dd22002-06-04 20:52:19 +00002372#ifdef IPV6_V6ONLY
2373 if (ai->ai_family == AF_INET6) {
2374 int on = 1;
2375 if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) < 0)
2376 error("setsockopt IPV6_V6ONLY: %.100s", strerror(errno));
2377 }
2378#endif
Damien Miller34132e52000-01-14 15:45:46 +11002379 if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
2380 debug("bind port %d: %.100s", port, strerror(errno));
Damien Miller34132e52000-01-14 15:45:46 +11002381 close(sock);
Damien Miller3c7eeb22000-03-03 22:35:33 +11002382
2383 if (ai->ai_next)
2384 continue;
2385
Damien Miller34132e52000-01-14 15:45:46 +11002386 for (n = 0; n < num_socks; n++) {
Damien Miller34132e52000-01-14 15:45:46 +11002387 close(socks[n]);
2388 }
2389 num_socks = 0;
2390 break;
2391 }
2392 socks[num_socks++] = sock;
Damien Miller7bcb0892000-03-11 20:45:40 +11002393#ifndef DONT_TRY_OTHER_AF
Damien Miller34132e52000-01-14 15:45:46 +11002394 if (num_socks == NUM_SOCKS)
2395 break;
Damien Miller7bcb0892000-03-11 20:45:40 +11002396#else
Kevin Stevesdf75dd22002-06-04 20:52:19 +00002397 if (x11_use_localhost) {
2398 if (num_socks == NUM_SOCKS)
2399 break;
2400 } else {
2401 break;
2402 }
Damien Miller7bcb0892000-03-11 20:45:40 +11002403#endif
Damien Miller95def091999-11-25 00:26:21 +11002404 }
Ben Lindstrom87b147f2001-01-25 00:41:12 +00002405 freeaddrinfo(aitop);
Damien Miller34132e52000-01-14 15:45:46 +11002406 if (num_socks > 0)
2407 break;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002408 }
Damien Miller95def091999-11-25 00:26:21 +11002409 if (display_number >= MAX_DISPLAYS) {
2410 error("Failed to allocate internet-domain X11 display socket.");
Kevin Steves366298c2001-12-19 17:58:01 +00002411 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002412 }
Damien Miller95def091999-11-25 00:26:21 +11002413 /* Start listening for connections on the socket. */
Damien Miller34132e52000-01-14 15:45:46 +11002414 for (n = 0; n < num_socks; n++) {
2415 sock = socks[n];
2416 if (listen(sock, 5) < 0) {
2417 error("listen: %.100s", strerror(errno));
Damien Miller34132e52000-01-14 15:45:46 +11002418 close(sock);
Kevin Steves366298c2001-12-19 17:58:01 +00002419 return -1;
Damien Miller34132e52000-01-14 15:45:46 +11002420 }
Damien Miller95def091999-11-25 00:26:21 +11002421 }
Damien Miller34132e52000-01-14 15:45:46 +11002422
Damien Miller34132e52000-01-14 15:45:46 +11002423 /* Allocate a channel for each socket. */
2424 for (n = 0; n < num_socks; n++) {
2425 sock = socks[n];
Damien Millere7378562001-12-21 14:58:35 +11002426 nc = channel_new("x11 listener",
Damien Millerbd483e72000-04-30 10:00:53 +10002427 SSH_CHANNEL_X11_LISTENER, sock, sock, -1,
2428 CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
Damien Miller69b69aa2000-10-28 14:19:58 +11002429 0, xstrdup("X11 inet listener"), 1);
Damien Miller699d0032002-02-08 22:07:16 +11002430 nc->single_connection = single_connection;
Damien Miller34132e52000-01-14 15:45:46 +11002431 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002432
Kevin Steves366298c2001-12-19 17:58:01 +00002433 /* Return the display number for the DISPLAY environment variable. */
2434 return display_number;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002435}
2436
Ben Lindstrombba81212001-06-25 05:01:22 +00002437static int
Ben Lindstrom46c16222000-12-22 01:43:59 +00002438connect_local_xsocket(u_int dnr)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002439{
Damien Miller95def091999-11-25 00:26:21 +11002440 int sock;
2441 struct sockaddr_un addr;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002442
Damien Miller3afe3752001-12-21 12:39:51 +11002443 sock = socket(AF_UNIX, SOCK_STREAM, 0);
2444 if (sock < 0)
2445 error("socket: %.100s", strerror(errno));
2446 memset(&addr, 0, sizeof(addr));
2447 addr.sun_family = AF_UNIX;
2448 snprintf(addr.sun_path, sizeof addr.sun_path, _PATH_UNIX_X, dnr);
2449 if (connect(sock, (struct sockaddr *) & addr, sizeof(addr)) == 0)
2450 return sock;
2451 close(sock);
Damien Miller95def091999-11-25 00:26:21 +11002452 error("connect %.100s: %.100s", addr.sun_path, strerror(errno));
2453 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002454}
2455
Damien Millerbd483e72000-04-30 10:00:53 +10002456int
2457x11_connect_display(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002458{
Damien Miller398e1cf2002-02-05 11:52:13 +11002459 int display_number, sock = 0;
Damien Miller95def091999-11-25 00:26:21 +11002460 const char *display;
Damien Millerbd483e72000-04-30 10:00:53 +10002461 char buf[1024], *cp;
Damien Miller34132e52000-01-14 15:45:46 +11002462 struct addrinfo hints, *ai, *aitop;
2463 char strport[NI_MAXSERV];
2464 int gaierr;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002465
Damien Miller95def091999-11-25 00:26:21 +11002466 /* Try to open a socket for the local X server. */
2467 display = getenv("DISPLAY");
2468 if (!display) {
2469 error("DISPLAY not set.");
Damien Millerbd483e72000-04-30 10:00:53 +10002470 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002471 }
Damien Miller5428f641999-11-25 11:54:57 +11002472 /*
2473 * Now we decode the value of the DISPLAY variable and make a
2474 * connection to the real X server.
2475 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002476
Damien Miller5428f641999-11-25 11:54:57 +11002477 /*
2478 * Check if it is a unix domain socket. Unix domain displays are in
2479 * one of the following formats: unix:d[.s], :d[.s], ::d[.s]
2480 */
Damien Miller95def091999-11-25 00:26:21 +11002481 if (strncmp(display, "unix:", 5) == 0 ||
2482 display[0] == ':') {
2483 /* Connect to the unix domain socket. */
2484 if (sscanf(strrchr(display, ':') + 1, "%d", &display_number) != 1) {
2485 error("Could not parse display number from DISPLAY: %.100s",
Damien Miller9f0f5c62001-12-21 14:45:46 +11002486 display);
Damien Millerbd483e72000-04-30 10:00:53 +10002487 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002488 }
2489 /* Create a socket. */
2490 sock = connect_local_xsocket(display_number);
2491 if (sock < 0)
Damien Millerbd483e72000-04-30 10:00:53 +10002492 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002493
2494 /* OK, we now have a connection to the display. */
Damien Millerbd483e72000-04-30 10:00:53 +10002495 return sock;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002496 }
Damien Miller5428f641999-11-25 11:54:57 +11002497 /*
2498 * Connect to an inet socket. The DISPLAY value is supposedly
2499 * hostname:d[.s], where hostname may also be numeric IP address.
2500 */
Ben Lindstromccd8d072001-12-07 17:26:48 +00002501 strlcpy(buf, display, sizeof(buf));
Damien Miller95def091999-11-25 00:26:21 +11002502 cp = strchr(buf, ':');
2503 if (!cp) {
2504 error("Could not find ':' in DISPLAY: %.100s", display);
Damien Millerbd483e72000-04-30 10:00:53 +10002505 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002506 }
Damien Miller95def091999-11-25 00:26:21 +11002507 *cp = 0;
Damien Miller5428f641999-11-25 11:54:57 +11002508 /* buf now contains the host name. But first we parse the display number. */
Damien Miller95def091999-11-25 00:26:21 +11002509 if (sscanf(cp + 1, "%d", &display_number) != 1) {
2510 error("Could not parse display number from DISPLAY: %.100s",
Damien Miller9f0f5c62001-12-21 14:45:46 +11002511 display);
Damien Millerbd483e72000-04-30 10:00:53 +10002512 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002513 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002514
Damien Miller34132e52000-01-14 15:45:46 +11002515 /* Look up the host address */
2516 memset(&hints, 0, sizeof(hints));
2517 hints.ai_family = IPv4or6;
2518 hints.ai_socktype = SOCK_STREAM;
2519 snprintf(strport, sizeof strport, "%d", 6000 + display_number);
2520 if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) {
2521 error("%.100s: unknown host. (%s)", buf, gai_strerror(gaierr));
Damien Millerbd483e72000-04-30 10:00:53 +10002522 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002523 }
Damien Miller34132e52000-01-14 15:45:46 +11002524 for (ai = aitop; ai; ai = ai->ai_next) {
2525 /* Create a socket. */
2526 sock = socket(ai->ai_family, SOCK_STREAM, 0);
2527 if (sock < 0) {
2528 debug("socket: %.100s", strerror(errno));
Damien Millerb38eff82000-04-01 11:09:21 +10002529 continue;
2530 }
2531 /* Connect it to the display. */
2532 if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
2533 debug("connect %.100s port %d: %.100s", buf,
2534 6000 + display_number, strerror(errno));
2535 close(sock);
2536 continue;
2537 }
2538 /* Success */
2539 break;
Damien Miller34132e52000-01-14 15:45:46 +11002540 }
Damien Miller34132e52000-01-14 15:45:46 +11002541 freeaddrinfo(aitop);
2542 if (!ai) {
Damien Miller4af51302000-04-16 11:18:38 +10002543 error("connect %.100s port %d: %.100s", buf, 6000 + display_number,
Damien Miller34132e52000-01-14 15:45:46 +11002544 strerror(errno));
Damien Millerbd483e72000-04-30 10:00:53 +10002545 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002546 }
Damien Miller398e1cf2002-02-05 11:52:13 +11002547 set_nodelay(sock);
Damien Millerbd483e72000-04-30 10:00:53 +10002548 return sock;
2549}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002550
Damien Millerbd483e72000-04-30 10:00:53 +10002551/*
2552 * This is called when SSH_SMSG_X11_OPEN is received. The packet contains
2553 * the remote channel number. We should do whatever we want, and respond
2554 * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE.
2555 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002556
Damien Millerbd483e72000-04-30 10:00:53 +10002557void
Damien Miller630d6f42002-01-22 23:17:30 +11002558x11_input_open(int type, u_int32_t seq, void *ctxt)
Damien Millerbd483e72000-04-30 10:00:53 +10002559{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002560 Channel *c = NULL;
2561 int remote_id, sock = 0;
Damien Millerbd483e72000-04-30 10:00:53 +10002562 char *remote_host;
Damien Millerbd483e72000-04-30 10:00:53 +10002563
2564 debug("Received X11 open request.");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002565
2566 remote_id = packet_get_int();
Ben Lindstrome9c99912001-06-09 00:41:05 +00002567
2568 if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002569 remote_host = packet_get_string(NULL);
2570 } else {
2571 remote_host = xstrdup("unknown (remote did not supply name)");
2572 }
Damien Miller48b03fc2002-01-22 23:11:40 +11002573 packet_check_eom();
Damien Millerbd483e72000-04-30 10:00:53 +10002574
2575 /* Obtain a connection to the real X display. */
2576 sock = x11_connect_display();
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002577 if (sock != -1) {
2578 /* Allocate a channel for this connection. */
2579 c = channel_new("connected x11 socket",
2580 SSH_CHANNEL_X11_OPEN, sock, sock, -1, 0, 0, 0,
2581 remote_host, 1);
Damien Miller699d0032002-02-08 22:07:16 +11002582 c->remote_id = remote_id;
2583 c->force_drain = 1;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002584 }
2585 if (c == NULL) {
Damien Millerbd483e72000-04-30 10:00:53 +10002586 /* Send refusal to the remote host. */
2587 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002588 packet_put_int(remote_id);
Damien Millerbd483e72000-04-30 10:00:53 +10002589 } else {
Damien Millerbd483e72000-04-30 10:00:53 +10002590 /* Send a confirmation to the remote host. */
2591 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002592 packet_put_int(remote_id);
2593 packet_put_int(c->self);
Damien Millerbd483e72000-04-30 10:00:53 +10002594 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002595 packet_send();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002596}
2597
Damien Miller69b69aa2000-10-28 14:19:58 +11002598/* dummy protocol handler that denies SSH-1 requests (agent/x11) */
2599void
Damien Miller630d6f42002-01-22 23:17:30 +11002600deny_input_open(int type, u_int32_t seq, void *ctxt)
Damien Miller69b69aa2000-10-28 14:19:58 +11002601{
2602 int rchan = packet_get_int();
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00002603 switch (type) {
Damien Miller69b69aa2000-10-28 14:19:58 +11002604 case SSH_SMSG_AGENT_OPEN:
2605 error("Warning: ssh server tried agent forwarding.");
2606 break;
2607 case SSH_SMSG_X11_OPEN:
2608 error("Warning: ssh server tried X11 forwarding.");
2609 break;
2610 default:
Damien Miller630d6f42002-01-22 23:17:30 +11002611 error("deny_input_open: type %d", type);
Damien Miller69b69aa2000-10-28 14:19:58 +11002612 break;
2613 }
2614 error("Warning: this is probably a break in attempt by a malicious server.");
2615 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
2616 packet_put_int(rchan);
2617 packet_send();
2618}
2619
Damien Miller5428f641999-11-25 11:54:57 +11002620/*
2621 * Requests forwarding of X11 connections, generates fake authentication
2622 * data, and enables authentication spoofing.
Ben Lindstrome9c99912001-06-09 00:41:05 +00002623 * This should be called in the client only.
Damien Miller5428f641999-11-25 11:54:57 +11002624 */
Damien Miller4af51302000-04-16 11:18:38 +10002625void
Damien Millerbd483e72000-04-30 10:00:53 +10002626x11_request_forwarding_with_spoofing(int client_session_id,
2627 const char *proto, const char *data)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002628{
Ben Lindstrom46c16222000-12-22 01:43:59 +00002629 u_int data_len = (u_int) strlen(data) / 2;
Ben Lindstromb3211a82001-02-10 22:33:19 +00002630 u_int i, value, len;
Damien Miller95def091999-11-25 00:26:21 +11002631 char *new_data;
2632 int screen_number;
2633 const char *cp;
2634 u_int32_t rand = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002635
Damien Miller95def091999-11-25 00:26:21 +11002636 cp = getenv("DISPLAY");
2637 if (cp)
2638 cp = strchr(cp, ':');
2639 if (cp)
2640 cp = strchr(cp, '.');
2641 if (cp)
2642 screen_number = atoi(cp + 1);
2643 else
2644 screen_number = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002645
Damien Miller95def091999-11-25 00:26:21 +11002646 /* Save protocol name. */
2647 x11_saved_proto = xstrdup(proto);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002648
Damien Miller5428f641999-11-25 11:54:57 +11002649 /*
2650 * Extract real authentication data and generate fake data of the
2651 * same length.
2652 */
Damien Miller95def091999-11-25 00:26:21 +11002653 x11_saved_data = xmalloc(data_len);
2654 x11_fake_data = xmalloc(data_len);
2655 for (i = 0; i < data_len; i++) {
2656 if (sscanf(data + 2 * i, "%2x", &value) != 1)
2657 fatal("x11_request_forwarding: bad authentication data: %.100s", data);
2658 if (i % 4 == 0)
2659 rand = arc4random();
2660 x11_saved_data[i] = value;
2661 x11_fake_data[i] = rand & 0xff;
2662 rand >>= 8;
2663 }
2664 x11_saved_data_len = data_len;
2665 x11_fake_data_len = data_len;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002666
Damien Miller95def091999-11-25 00:26:21 +11002667 /* Convert the fake data into hex. */
Ben Lindstromb3211a82001-02-10 22:33:19 +00002668 len = 2 * data_len + 1;
2669 new_data = xmalloc(len);
Damien Miller95def091999-11-25 00:26:21 +11002670 for (i = 0; i < data_len; i++)
Ben Lindstromb3211a82001-02-10 22:33:19 +00002671 snprintf(new_data + 2 * i, len - 2 * i,
2672 "%02x", (u_char) x11_fake_data[i]);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002673
Damien Miller95def091999-11-25 00:26:21 +11002674 /* Send the request packet. */
Damien Millerbd483e72000-04-30 10:00:53 +10002675 if (compat20) {
2676 channel_request_start(client_session_id, "x11-req", 0);
2677 packet_put_char(0); /* XXX bool single connection */
2678 } else {
2679 packet_start(SSH_CMSG_X11_REQUEST_FORWARDING);
2680 }
2681 packet_put_cstring(proto);
2682 packet_put_cstring(new_data);
Damien Miller95def091999-11-25 00:26:21 +11002683 packet_put_int(screen_number);
2684 packet_send();
2685 packet_write_wait();
2686 xfree(new_data);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002687}
2688
Ben Lindstrome9c99912001-06-09 00:41:05 +00002689
2690/* -- agent forwarding */
2691
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002692/* Sends a message to the server to request authentication fd forwarding. */
2693
Damien Miller4af51302000-04-16 11:18:38 +10002694void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00002695auth_request_forwarding(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002696{
Damien Miller95def091999-11-25 00:26:21 +11002697 packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING);
2698 packet_send();
2699 packet_write_wait();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002700}
2701
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002702/* This is called to process an SSH_SMSG_AGENT_OPEN message. */
2703
Damien Miller4af51302000-04-16 11:18:38 +10002704void
Damien Miller630d6f42002-01-22 23:17:30 +11002705auth_input_open_request(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002706{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002707 Channel *c = NULL;
2708 int remote_id, sock;
Ben Lindstrome9c99912001-06-09 00:41:05 +00002709 char *name;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002710
Damien Miller95def091999-11-25 00:26:21 +11002711 /* Read the remote channel number from the message. */
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002712 remote_id = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11002713 packet_check_eom();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002714
Damien Miller5428f641999-11-25 11:54:57 +11002715 /*
2716 * Get a connection to the local authentication agent (this may again
2717 * get forwarded).
2718 */
Damien Miller95def091999-11-25 00:26:21 +11002719 sock = ssh_get_authentication_socket();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002720
Damien Miller5428f641999-11-25 11:54:57 +11002721 /*
2722 * If we could not connect the agent, send an error message back to
2723 * the server. This should never happen unless the agent dies,
2724 * because authentication forwarding is only enabled if we have an
2725 * agent.
2726 */
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002727 if (sock >= 0) {
Ben Lindstrome9c99912001-06-09 00:41:05 +00002728 name = xstrdup("authentication agent connection");
2729 c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
2730 -1, 0, 0, 0, name, 1);
Damien Miller699d0032002-02-08 22:07:16 +11002731 c->remote_id = remote_id;
2732 c->force_drain = 1;
Damien Miller95def091999-11-25 00:26:21 +11002733 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002734 if (c == NULL) {
2735 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
2736 packet_put_int(remote_id);
2737 } else {
2738 /* Send a confirmation to the remote host. */
2739 debug("Forwarding authentication connection.");
2740 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
2741 packet_put_int(remote_id);
2742 packet_put_int(c->self);
2743 }
Damien Miller95def091999-11-25 00:26:21 +11002744 packet_send();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002745}