blob: 6ff9e2583012047a53739de2220a3afcf7080805 [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"
Damien Miller9b037b82002-09-19 11:54:54 +100042RCSID("$OpenBSD: channels.c,v 1.183 2002/09/17 07:47:02 itojun 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 }
Ben Lindstrombeb5f332002-07-22 15:28:53 +0000189 c->wfd_isatty = isatty(c->wfd);
Damien Miller79438cc2001-02-16 12:34:57 +1100190
Damien Miller69b69aa2000-10-28 14:19:58 +1100191 /* enable nonblocking mode */
192 if (nonblock) {
193 if (rfd != -1)
194 set_nonblock(rfd);
195 if (wfd != -1)
196 set_nonblock(wfd);
197 if (efd != -1)
198 set_nonblock(efd);
199 }
Damien Miller6f83b8e2000-05-02 09:23:45 +1000200}
201
202/*
203 * Allocate a new channel object and set its type and socket. This will cause
204 * remote_name to be freed.
205 */
206
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000207Channel *
Damien Miller6f83b8e2000-05-02 09:23:45 +1000208channel_new(char *ctype, int type, int rfd, int wfd, int efd,
Ben Lindstrom4fed2be2002-06-25 23:17:36 +0000209 u_int window, u_int maxpack, int extusage, char *remote_name, int nonblock)
Damien Miller6f83b8e2000-05-02 09:23:45 +1000210{
211 int i, found;
212 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000213
Damien Miller95def091999-11-25 00:26:21 +1100214 /* Do initial allocation if this is the first call. */
215 if (channels_alloc == 0) {
216 channels_alloc = 10;
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000217 channels = xmalloc(channels_alloc * sizeof(Channel *));
Damien Miller95def091999-11-25 00:26:21 +1100218 for (i = 0; i < channels_alloc; i++)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000219 channels[i] = NULL;
Ben Lindstrom601e4362001-06-21 03:19:23 +0000220 fatal_add_cleanup((void (*) (void *)) channel_free_all, NULL);
Damien Miller95def091999-11-25 00:26:21 +1100221 }
222 /* Try to find a free slot where to put the new channel. */
223 for (found = -1, i = 0; i < channels_alloc; i++)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000224 if (channels[i] == NULL) {
Damien Miller95def091999-11-25 00:26:21 +1100225 /* Found a free slot. */
226 found = i;
227 break;
228 }
229 if (found == -1) {
Damien Miller5428f641999-11-25 11:54:57 +1100230 /* There are no free slots. Take last+1 slot and expand the array. */
Damien Miller95def091999-11-25 00:26:21 +1100231 found = channels_alloc;
232 channels_alloc += 10;
Damien Miller9403aa22002-06-26 19:14:43 +1000233 if (channels_alloc > 10000)
234 fatal("channel_new: internal error: channels_alloc %d "
235 "too big.", channels_alloc);
Damien Millerd3444942000-09-30 14:20:03 +1100236 debug2("channel: expanding %d", channels_alloc);
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000237 channels = xrealloc(channels, channels_alloc * sizeof(Channel *));
Damien Miller95def091999-11-25 00:26:21 +1100238 for (i = found; i < channels_alloc; i++)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000239 channels[i] = NULL;
Damien Miller95def091999-11-25 00:26:21 +1100240 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000241 /* Initialize and return new channel. */
242 c = channels[found] = xmalloc(sizeof(Channel));
Damien Miller4623a752001-10-10 15:03:58 +1000243 memset(c, 0, sizeof(Channel));
Damien Miller95def091999-11-25 00:26:21 +1100244 buffer_init(&c->input);
245 buffer_init(&c->output);
Damien Millerb38eff82000-04-01 11:09:21 +1000246 buffer_init(&c->extended);
Damien Miller5144df92002-01-22 23:28:45 +1100247 c->ostate = CHAN_OUTPUT_OPEN;
248 c->istate = CHAN_INPUT_OPEN;
249 c->flags = 0;
Damien Miller69b69aa2000-10-28 14:19:58 +1100250 channel_register_fds(c, rfd, wfd, efd, extusage, nonblock);
Damien Miller95def091999-11-25 00:26:21 +1100251 c->self = found;
252 c->type = type;
Damien Millerb38eff82000-04-01 11:09:21 +1000253 c->ctype = ctype;
Damien Millerbd483e72000-04-30 10:00:53 +1000254 c->local_window = window;
255 c->local_window_max = window;
256 c->local_consumed = 0;
257 c->local_maxpacket = maxpack;
Damien Miller95def091999-11-25 00:26:21 +1100258 c->remote_id = -1;
259 c->remote_name = remote_name;
Damien Millerb38eff82000-04-01 11:09:21 +1000260 c->remote_window = 0;
261 c->remote_maxpacket = 0;
Ben Lindstrom944c4f02001-09-18 05:51:13 +0000262 c->force_drain = 0;
Damien Millere7378562001-12-21 14:58:35 +1100263 c->single_connection = 0;
Ben Lindstrom809744e2001-07-04 05:26:06 +0000264 c->detach_user = NULL;
Damien Miller67f0bc02002-02-05 12:23:08 +1100265 c->confirm = NULL;
Damien Millerad833b32000-08-23 10:46:23 +1000266 c->input_filter = NULL;
Damien Miller95def091999-11-25 00:26:21 +1100267 debug("channel %d: new [%s]", found, remote_name);
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000268 return c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000269}
Damien Miller6f83b8e2000-05-02 09:23:45 +1000270
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000271static int
272channel_find_maxfd(void)
273{
274 int i, max = 0;
275 Channel *c;
276
277 for (i = 0; i < channels_alloc; i++) {
278 c = channels[i];
279 if (c != NULL) {
280 max = MAX(max, c->rfd);
281 max = MAX(max, c->wfd);
282 max = MAX(max, c->efd);
283 }
284 }
285 return max;
286}
287
288int
289channel_close_fd(int *fdp)
290{
291 int ret = 0, fd = *fdp;
292
293 if (fd != -1) {
294 ret = close(fd);
295 *fdp = -1;
296 if (fd == channel_max_fd)
297 channel_max_fd = channel_find_maxfd();
298 }
299 return ret;
300}
301
Damien Miller6f83b8e2000-05-02 09:23:45 +1000302/* Close all channel fd/socket. */
303
Ben Lindstrombba81212001-06-25 05:01:22 +0000304static void
Damien Miller6f83b8e2000-05-02 09:23:45 +1000305channel_close_fds(Channel *c)
306{
Ben Lindstromc0dee1a2001-06-05 20:52:50 +0000307 debug3("channel_close_fds: channel %d: r %d w %d e %d",
308 c->self, c->rfd, c->wfd, c->efd);
309
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000310 channel_close_fd(&c->sock);
311 channel_close_fd(&c->rfd);
312 channel_close_fd(&c->wfd);
313 channel_close_fd(&c->efd);
Damien Miller6f83b8e2000-05-02 09:23:45 +1000314}
315
316/* Free the channel and close its fd/socket. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000317
Damien Miller4af51302000-04-16 11:18:38 +1000318void
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000319channel_free(Channel *c)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000320{
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000321 char *s;
Ben Lindstromc0dee1a2001-06-05 20:52:50 +0000322 int i, n;
323
324 for (n = 0, i = 0; i < channels_alloc; i++)
325 if (channels[i])
326 n++;
Ben Lindstrom4c247552001-06-05 20:56:47 +0000327 debug("channel_free: channel %d: %s, nchannels %d", c->self,
Ben Lindstromc0dee1a2001-06-05 20:52:50 +0000328 c->remote_name ? c->remote_name : "???", n);
Ben Lindstrom6c3ae2b2000-12-30 03:25:14 +0000329
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000330 s = channel_open_message();
Ben Lindstrom4c247552001-06-05 20:56:47 +0000331 debug3("channel_free: status: %s", s);
Ben Lindstrom6c3ae2b2000-12-30 03:25:14 +0000332 xfree(s);
333
Damien Miller6f83b8e2000-05-02 09:23:45 +1000334 if (c->sock != -1)
Damien Millerb38eff82000-04-01 11:09:21 +1000335 shutdown(c->sock, SHUT_RDWR);
Damien Miller6f83b8e2000-05-02 09:23:45 +1000336 channel_close_fds(c);
Damien Millerb38eff82000-04-01 11:09:21 +1000337 buffer_free(&c->input);
338 buffer_free(&c->output);
339 buffer_free(&c->extended);
Damien Millerb38eff82000-04-01 11:09:21 +1000340 if (c->remote_name) {
341 xfree(c->remote_name);
342 c->remote_name = NULL;
Damien Miller95def091999-11-25 00:26:21 +1100343 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000344 channels[c->self] = NULL;
345 xfree(c);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000346}
347
Ben Lindstrome9c99912001-06-09 00:41:05 +0000348void
Ben Lindstrom601e4362001-06-21 03:19:23 +0000349channel_free_all(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000350{
351 int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000352
Ben Lindstrom601e4362001-06-21 03:19:23 +0000353 for (i = 0; i < channels_alloc; i++)
354 if (channels[i] != NULL)
355 channel_free(channels[i]);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000356}
357
358/*
359 * Closes the sockets/fds of all channels. This is used to close extra file
360 * descriptors after a fork.
361 */
362
363void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000364channel_close_all(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000365{
366 int i;
367
368 for (i = 0; i < channels_alloc; i++)
369 if (channels[i] != NULL)
370 channel_close_fds(channels[i]);
371}
372
373/*
Ben Lindstrom809744e2001-07-04 05:26:06 +0000374 * Stop listening to channels.
375 */
376
377void
378channel_stop_listening(void)
379{
380 int i;
381 Channel *c;
382
383 for (i = 0; i < channels_alloc; i++) {
384 c = channels[i];
385 if (c != NULL) {
386 switch (c->type) {
387 case SSH_CHANNEL_AUTH_SOCKET:
388 case SSH_CHANNEL_PORT_LISTENER:
389 case SSH_CHANNEL_RPORT_LISTENER:
390 case SSH_CHANNEL_X11_LISTENER:
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000391 channel_close_fd(&c->sock);
Ben Lindstrom809744e2001-07-04 05:26:06 +0000392 channel_free(c);
393 break;
394 }
395 }
396 }
397}
398
399/*
Ben Lindstrome9c99912001-06-09 00:41:05 +0000400 * Returns true if no channel has too much buffered data, and false if one or
401 * more channel is overfull.
402 */
403
404int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000405channel_not_very_much_buffered_data(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000406{
407 u_int i;
408 Channel *c;
409
410 for (i = 0; i < channels_alloc; i++) {
411 c = channels[i];
412 if (c != NULL && c->type == SSH_CHANNEL_OPEN) {
Damien Milleraf5f2e62001-10-10 15:01:16 +1000413#if 0
414 if (!compat20 &&
415 buffer_len(&c->input) > packet_get_maxsize()) {
Ben Lindstrome9c99912001-06-09 00:41:05 +0000416 debug("channel %d: big input buffer %d",
417 c->self, buffer_len(&c->input));
418 return 0;
419 }
Damien Milleraf5f2e62001-10-10 15:01:16 +1000420#endif
Ben Lindstrome9c99912001-06-09 00:41:05 +0000421 if (buffer_len(&c->output) > packet_get_maxsize()) {
Damien Milleraf5f2e62001-10-10 15:01:16 +1000422 debug("channel %d: big output buffer %d > %d",
423 c->self, buffer_len(&c->output),
424 packet_get_maxsize());
Ben Lindstrome9c99912001-06-09 00:41:05 +0000425 return 0;
426 }
427 }
428 }
429 return 1;
430}
431
432/* Returns true if any channel is still open. */
433
434int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000435channel_still_open(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000436{
437 int i;
438 Channel *c;
439
440 for (i = 0; i < channels_alloc; i++) {
441 c = channels[i];
442 if (c == NULL)
443 continue;
444 switch (c->type) {
445 case SSH_CHANNEL_X11_LISTENER:
446 case SSH_CHANNEL_PORT_LISTENER:
447 case SSH_CHANNEL_RPORT_LISTENER:
448 case SSH_CHANNEL_CLOSED:
449 case SSH_CHANNEL_AUTH_SOCKET:
450 case SSH_CHANNEL_DYNAMIC:
451 case SSH_CHANNEL_CONNECTING:
452 case SSH_CHANNEL_ZOMBIE:
453 continue;
454 case SSH_CHANNEL_LARVAL:
455 if (!compat20)
456 fatal("cannot happen: SSH_CHANNEL_LARVAL");
457 continue;
458 case SSH_CHANNEL_OPENING:
459 case SSH_CHANNEL_OPEN:
460 case SSH_CHANNEL_X11_OPEN:
461 return 1;
462 case SSH_CHANNEL_INPUT_DRAINING:
463 case SSH_CHANNEL_OUTPUT_DRAINING:
464 if (!compat13)
465 fatal("cannot happen: OUT_DRAIN");
466 return 1;
467 default:
468 fatal("channel_still_open: bad channel type %d", c->type);
469 /* NOTREACHED */
470 }
471 }
472 return 0;
473}
474
475/* Returns the id of an open channel suitable for keepaliving */
476
477int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000478channel_find_open(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000479{
480 int i;
481 Channel *c;
482
483 for (i = 0; i < channels_alloc; i++) {
484 c = channels[i];
485 if (c == NULL)
486 continue;
487 switch (c->type) {
488 case SSH_CHANNEL_CLOSED:
489 case SSH_CHANNEL_DYNAMIC:
490 case SSH_CHANNEL_X11_LISTENER:
491 case SSH_CHANNEL_PORT_LISTENER:
492 case SSH_CHANNEL_RPORT_LISTENER:
493 case SSH_CHANNEL_OPENING:
494 case SSH_CHANNEL_CONNECTING:
495 case SSH_CHANNEL_ZOMBIE:
496 continue;
497 case SSH_CHANNEL_LARVAL:
498 case SSH_CHANNEL_AUTH_SOCKET:
499 case SSH_CHANNEL_OPEN:
500 case SSH_CHANNEL_X11_OPEN:
501 return i;
502 case SSH_CHANNEL_INPUT_DRAINING:
503 case SSH_CHANNEL_OUTPUT_DRAINING:
504 if (!compat13)
505 fatal("cannot happen: OUT_DRAIN");
506 return i;
507 default:
508 fatal("channel_find_open: bad channel type %d", c->type);
509 /* NOTREACHED */
510 }
511 }
512 return -1;
513}
514
515
516/*
517 * Returns a message describing the currently open forwarded connections,
518 * suitable for sending to the client. The message contains crlf pairs for
519 * newlines.
520 */
521
522char *
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000523channel_open_message(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000524{
525 Buffer buffer;
526 Channel *c;
527 char buf[1024], *cp;
528 int i;
529
530 buffer_init(&buffer);
531 snprintf(buf, sizeof buf, "The following connections are open:\r\n");
532 buffer_append(&buffer, buf, strlen(buf));
533 for (i = 0; i < channels_alloc; i++) {
534 c = channels[i];
535 if (c == NULL)
536 continue;
537 switch (c->type) {
538 case SSH_CHANNEL_X11_LISTENER:
539 case SSH_CHANNEL_PORT_LISTENER:
540 case SSH_CHANNEL_RPORT_LISTENER:
541 case SSH_CHANNEL_CLOSED:
542 case SSH_CHANNEL_AUTH_SOCKET:
543 case SSH_CHANNEL_ZOMBIE:
544 continue;
545 case SSH_CHANNEL_LARVAL:
546 case SSH_CHANNEL_OPENING:
547 case SSH_CHANNEL_CONNECTING:
548 case SSH_CHANNEL_DYNAMIC:
549 case SSH_CHANNEL_OPEN:
550 case SSH_CHANNEL_X11_OPEN:
551 case SSH_CHANNEL_INPUT_DRAINING:
552 case SSH_CHANNEL_OUTPUT_DRAINING:
553 snprintf(buf, sizeof buf, " #%d %.300s (t%d r%d i%d/%d o%d/%d fd %d/%d)\r\n",
554 c->self, c->remote_name,
555 c->type, c->remote_id,
556 c->istate, buffer_len(&c->input),
557 c->ostate, buffer_len(&c->output),
558 c->rfd, c->wfd);
559 buffer_append(&buffer, buf, strlen(buf));
560 continue;
561 default:
562 fatal("channel_open_message: bad channel type %d", c->type);
563 /* NOTREACHED */
564 }
565 }
566 buffer_append(&buffer, "\0", 1);
567 cp = xstrdup(buffer_ptr(&buffer));
568 buffer_free(&buffer);
569 return cp;
570}
571
572void
573channel_send_open(int id)
574{
575 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000576
Ben Lindstrome9c99912001-06-09 00:41:05 +0000577 if (c == NULL) {
578 log("channel_send_open: %d: bad id", id);
579 return;
580 }
581 debug("send channel open %d", id);
582 packet_start(SSH2_MSG_CHANNEL_OPEN);
583 packet_put_cstring(c->ctype);
584 packet_put_int(c->self);
585 packet_put_int(c->local_window);
586 packet_put_int(c->local_maxpacket);
587 packet_send();
588}
589
590void
Damien Millera500cd62002-02-08 22:04:26 +1100591channel_request_start(int local_id, char *service, int wantconfirm)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000592{
Damien Millera500cd62002-02-08 22:04:26 +1100593 Channel *c = channel_lookup(local_id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000594
Ben Lindstrome9c99912001-06-09 00:41:05 +0000595 if (c == NULL) {
Damien Millera500cd62002-02-08 22:04:26 +1100596 log("channel_request_start: %d: unknown channel id", local_id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000597 return;
598 }
Damien Millera500cd62002-02-08 22:04:26 +1100599 debug("channel request %d: %s", local_id, service) ;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000600 packet_start(SSH2_MSG_CHANNEL_REQUEST);
601 packet_put_int(c->remote_id);
602 packet_put_cstring(service);
603 packet_put_char(wantconfirm);
604}
605void
Damien Miller67f0bc02002-02-05 12:23:08 +1100606channel_register_confirm(int id, channel_callback_fn *fn)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000607{
608 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000609
Ben Lindstrome9c99912001-06-09 00:41:05 +0000610 if (c == NULL) {
Damien Miller67f0bc02002-02-05 12:23:08 +1100611 log("channel_register_comfirm: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000612 return;
613 }
Damien Miller67f0bc02002-02-05 12:23:08 +1100614 c->confirm = fn;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000615}
616void
617channel_register_cleanup(int id, channel_callback_fn *fn)
618{
619 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000620
Ben Lindstrome9c99912001-06-09 00:41:05 +0000621 if (c == NULL) {
622 log("channel_register_cleanup: %d: bad id", id);
623 return;
624 }
Ben Lindstrom809744e2001-07-04 05:26:06 +0000625 c->detach_user = fn;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000626}
627void
628channel_cancel_cleanup(int id)
629{
630 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000631
Ben Lindstrome9c99912001-06-09 00:41:05 +0000632 if (c == NULL) {
633 log("channel_cancel_cleanup: %d: bad id", id);
634 return;
635 }
Ben Lindstrom809744e2001-07-04 05:26:06 +0000636 c->detach_user = NULL;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000637}
638void
639channel_register_filter(int id, channel_filter_fn *fn)
640{
641 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000642
Ben Lindstrome9c99912001-06-09 00:41:05 +0000643 if (c == NULL) {
644 log("channel_register_filter: %d: bad id", id);
645 return;
646 }
647 c->input_filter = fn;
648}
649
650void
651channel_set_fds(int id, int rfd, int wfd, int efd,
Damien Miller2aa0c192002-02-19 15:20:08 +1100652 int extusage, int nonblock, u_int window_max)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000653{
654 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000655
Ben Lindstrome9c99912001-06-09 00:41:05 +0000656 if (c == NULL || c->type != SSH_CHANNEL_LARVAL)
657 fatal("channel_activate for non-larval channel %d.", id);
658 channel_register_fds(c, rfd, wfd, efd, extusage, nonblock);
659 c->type = SSH_CHANNEL_OPEN;
Damien Miller2aa0c192002-02-19 15:20:08 +1100660 c->local_window = c->local_window_max = window_max;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000661 packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
662 packet_put_int(c->remote_id);
663 packet_put_int(c->local_window);
664 packet_send();
665}
666
Damien Miller5428f641999-11-25 11:54:57 +1100667/*
Damien Millerb38eff82000-04-01 11:09:21 +1000668 * 'channel_pre*' are called just before select() to add any bits relevant to
669 * channels in the select bitmasks.
Damien Miller5428f641999-11-25 11:54:57 +1100670 */
Damien Millerb38eff82000-04-01 11:09:21 +1000671/*
672 * 'channel_post*': perform any appropriate operations for channels which
673 * have events pending.
674 */
675typedef void chan_fn(Channel *c, fd_set * readset, fd_set * writeset);
676chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE];
677chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE];
678
Ben Lindstrombba81212001-06-25 05:01:22 +0000679static void
Damien Millerb38eff82000-04-01 11:09:21 +1000680channel_pre_listener(Channel *c, fd_set * readset, fd_set * writeset)
681{
682 FD_SET(c->sock, readset);
683}
684
Ben Lindstrombba81212001-06-25 05:01:22 +0000685static void
Ben Lindstrom7ad97102000-12-06 01:42:49 +0000686channel_pre_connecting(Channel *c, fd_set * readset, fd_set * writeset)
687{
688 debug3("channel %d: waiting for connection", c->self);
689 FD_SET(c->sock, writeset);
690}
691
Ben Lindstrombba81212001-06-25 05:01:22 +0000692static void
Damien Millerb38eff82000-04-01 11:09:21 +1000693channel_pre_open_13(Channel *c, fd_set * readset, fd_set * writeset)
694{
695 if (buffer_len(&c->input) < packet_get_maxsize())
696 FD_SET(c->sock, readset);
697 if (buffer_len(&c->output) > 0)
698 FD_SET(c->sock, writeset);
699}
700
Ben Lindstrombba81212001-06-25 05:01:22 +0000701static void
Damien Millerde6987c2002-01-22 23:20:40 +1100702channel_pre_open(Channel *c, fd_set * readset, fd_set * writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000703{
Damien Millerde6987c2002-01-22 23:20:40 +1100704 u_int limit = compat20 ? c->remote_window : packet_get_maxsize();
Damien Millerb38eff82000-04-01 11:09:21 +1000705
Damien Miller33b13562000-04-04 14:38:59 +1000706 if (c->istate == CHAN_INPUT_OPEN &&
Damien Millerde6987c2002-01-22 23:20:40 +1100707 limit > 0 &&
708 buffer_len(&c->input) < limit)
Damien Miller33b13562000-04-04 14:38:59 +1000709 FD_SET(c->rfd, readset);
710 if (c->ostate == CHAN_OUTPUT_OPEN ||
711 c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
712 if (buffer_len(&c->output) > 0) {
713 FD_SET(c->wfd, writeset);
714 } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
Ben Lindstromcf159442002-03-26 03:26:24 +0000715 if (CHANNEL_EFD_OUTPUT_ACTIVE(c))
Ben Lindstrom5a6abda2002-06-09 19:41:48 +0000716 debug2("channel %d: obuf_empty delayed efd %d/(%d)",
717 c->self, c->efd, buffer_len(&c->extended));
Ben Lindstromcf159442002-03-26 03:26:24 +0000718 else
719 chan_obuf_empty(c);
Damien Miller33b13562000-04-04 14:38:59 +1000720 }
721 }
722 /** XXX check close conditions, too */
Damien Millerde6987c2002-01-22 23:20:40 +1100723 if (compat20 && c->efd != -1) {
Damien Miller33b13562000-04-04 14:38:59 +1000724 if (c->extended_usage == CHAN_EXTENDED_WRITE &&
725 buffer_len(&c->extended) > 0)
726 FD_SET(c->efd, writeset);
Ben Lindstromcf159442002-03-26 03:26:24 +0000727 else if (!(c->flags & CHAN_EOF_SENT) &&
728 c->extended_usage == CHAN_EXTENDED_READ &&
Damien Miller33b13562000-04-04 14:38:59 +1000729 buffer_len(&c->extended) < c->remote_window)
730 FD_SET(c->efd, readset);
731 }
732}
733
Ben Lindstrombba81212001-06-25 05:01:22 +0000734static void
Damien Millerb38eff82000-04-01 11:09:21 +1000735channel_pre_input_draining(Channel *c, fd_set * readset, fd_set * writeset)
736{
737 if (buffer_len(&c->input) == 0) {
738 packet_start(SSH_MSG_CHANNEL_CLOSE);
739 packet_put_int(c->remote_id);
740 packet_send();
741 c->type = SSH_CHANNEL_CLOSED;
Ben Lindstromc486d882001-04-11 16:08:34 +0000742 debug("channel %d: closing after input drain.", c->self);
Damien Millerb38eff82000-04-01 11:09:21 +1000743 }
744}
745
Ben Lindstrombba81212001-06-25 05:01:22 +0000746static void
Damien Millerb38eff82000-04-01 11:09:21 +1000747channel_pre_output_draining(Channel *c, fd_set * readset, fd_set * writeset)
748{
749 if (buffer_len(&c->output) == 0)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000750 chan_mark_dead(c);
Damien Miller4af51302000-04-16 11:18:38 +1000751 else
Damien Millerb38eff82000-04-01 11:09:21 +1000752 FD_SET(c->sock, writeset);
753}
754
755/*
756 * This is a special state for X11 authentication spoofing. An opened X11
757 * connection (when authentication spoofing is being done) remains in this
758 * state until the first packet has been completely read. The authentication
759 * data in that packet is then substituted by the real data if it matches the
760 * fake data, and the channel is put into normal mode.
Damien Millerbd483e72000-04-30 10:00:53 +1000761 * XXX All this happens at the client side.
Ben Lindstrome9c99912001-06-09 00:41:05 +0000762 * Returns: 0 = need more data, -1 = wrong cookie, 1 = ok
Damien Millerb38eff82000-04-01 11:09:21 +1000763 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000764static int
Ben Lindstrome9c99912001-06-09 00:41:05 +0000765x11_open_helper(Buffer *b)
Damien Millerb38eff82000-04-01 11:09:21 +1000766{
Ben Lindstrom46c16222000-12-22 01:43:59 +0000767 u_char *ucp;
768 u_int proto_len, data_len;
Damien Millerb38eff82000-04-01 11:09:21 +1000769
770 /* Check if the fixed size part of the packet is in buffer. */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000771 if (buffer_len(b) < 12)
Damien Millerb38eff82000-04-01 11:09:21 +1000772 return 0;
773
774 /* Parse the lengths of variable-length fields. */
Damien Miller708d21c2002-01-22 23:18:15 +1100775 ucp = buffer_ptr(b);
Damien Millerb38eff82000-04-01 11:09:21 +1000776 if (ucp[0] == 0x42) { /* Byte order MSB first. */
777 proto_len = 256 * ucp[6] + ucp[7];
778 data_len = 256 * ucp[8] + ucp[9];
779 } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */
780 proto_len = ucp[6] + 256 * ucp[7];
781 data_len = ucp[8] + 256 * ucp[9];
782 } else {
783 debug("Initial X11 packet contains bad byte order byte: 0x%x",
Damien Miller9f0f5c62001-12-21 14:45:46 +1100784 ucp[0]);
Damien Millerb38eff82000-04-01 11:09:21 +1000785 return -1;
786 }
787
788 /* Check if the whole packet is in buffer. */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000789 if (buffer_len(b) <
Damien Millerb38eff82000-04-01 11:09:21 +1000790 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3))
791 return 0;
792
793 /* Check if authentication protocol matches. */
794 if (proto_len != strlen(x11_saved_proto) ||
795 memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) {
796 debug("X11 connection uses different authentication protocol.");
797 return -1;
798 }
799 /* Check if authentication data matches our fake data. */
800 if (data_len != x11_fake_data_len ||
801 memcmp(ucp + 12 + ((proto_len + 3) & ~3),
802 x11_fake_data, x11_fake_data_len) != 0) {
803 debug("X11 auth data does not match fake data.");
804 return -1;
805 }
806 /* Check fake data length */
807 if (x11_fake_data_len != x11_saved_data_len) {
808 error("X11 fake_data_len %d != saved_data_len %d",
809 x11_fake_data_len, x11_saved_data_len);
810 return -1;
811 }
812 /*
813 * Received authentication protocol and data match
814 * our fake data. Substitute the fake data with real
815 * data.
816 */
817 memcpy(ucp + 12 + ((proto_len + 3) & ~3),
818 x11_saved_data, x11_saved_data_len);
819 return 1;
820}
821
Ben Lindstrombba81212001-06-25 05:01:22 +0000822static void
Damien Millerb38eff82000-04-01 11:09:21 +1000823channel_pre_x11_open_13(Channel *c, fd_set * readset, fd_set * writeset)
824{
Ben Lindstrome9c99912001-06-09 00:41:05 +0000825 int ret = x11_open_helper(&c->output);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000826
Damien Millerb38eff82000-04-01 11:09:21 +1000827 if (ret == 1) {
828 /* Start normal processing for the channel. */
829 c->type = SSH_CHANNEL_OPEN;
Damien Miller78928792000-04-12 20:17:38 +1000830 channel_pre_open_13(c, readset, writeset);
Damien Millerb38eff82000-04-01 11:09:21 +1000831 } else if (ret == -1) {
832 /*
833 * We have received an X11 connection that has bad
834 * authentication information.
835 */
Ben Lindstrom6df8ef42001-03-05 07:47:23 +0000836 log("X11 connection rejected because of wrong authentication.");
Damien Millerb38eff82000-04-01 11:09:21 +1000837 buffer_clear(&c->input);
838 buffer_clear(&c->output);
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000839 channel_close_fd(&c->sock);
Damien Millerb38eff82000-04-01 11:09:21 +1000840 c->sock = -1;
841 c->type = SSH_CHANNEL_CLOSED;
842 packet_start(SSH_MSG_CHANNEL_CLOSE);
843 packet_put_int(c->remote_id);
844 packet_send();
845 }
846}
847
Ben Lindstrombba81212001-06-25 05:01:22 +0000848static void
Damien Millerbd483e72000-04-30 10:00:53 +1000849channel_pre_x11_open(Channel *c, fd_set * readset, fd_set * writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000850{
Ben Lindstrome9c99912001-06-09 00:41:05 +0000851 int ret = x11_open_helper(&c->output);
Ben Lindstrom944c4f02001-09-18 05:51:13 +0000852
853 /* c->force_drain = 1; */
854
Damien Millerb38eff82000-04-01 11:09:21 +1000855 if (ret == 1) {
856 c->type = SSH_CHANNEL_OPEN;
Damien Millerde6987c2002-01-22 23:20:40 +1100857 channel_pre_open(c, readset, writeset);
Damien Millerb38eff82000-04-01 11:09:21 +1000858 } else if (ret == -1) {
Damien Millera90fc082002-01-22 23:19:38 +1100859 log("X11 connection rejected because of wrong authentication.");
Damien Millerb38eff82000-04-01 11:09:21 +1000860 debug("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate);
Damien Millera90fc082002-01-22 23:19:38 +1100861 chan_read_failed(c);
862 buffer_clear(&c->input);
863 chan_ibuf_empty(c);
864 buffer_clear(&c->output);
865 /* for proto v1, the peer will send an IEOF */
866 if (compat20)
867 chan_write_failed(c);
868 else
869 c->type = SSH_CHANNEL_OPEN;
Damien Millerb38eff82000-04-01 11:09:21 +1000870 debug("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate);
871 }
872}
873
Ben Lindstromb3921512001-04-11 15:57:50 +0000874/* try to decode a socks4 header */
Ben Lindstrombba81212001-06-25 05:01:22 +0000875static int
Ben Lindstromb3921512001-04-11 15:57:50 +0000876channel_decode_socks4(Channel *c, fd_set * readset, fd_set * writeset)
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000877{
Damien Millera10f5612002-09-12 09:49:15 +1000878 char *p, *host;
Ben Lindstrom2b261b92001-04-17 18:14:34 +0000879 int len, have, i, found;
Damien Miller9f0f5c62001-12-21 14:45:46 +1100880 char username[256];
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000881 struct {
882 u_int8_t version;
883 u_int8_t command;
884 u_int16_t dest_port;
Ben Lindstromb3921512001-04-11 15:57:50 +0000885 struct in_addr dest_addr;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000886 } s4_req, s4_rsp;
887
Ben Lindstromb3921512001-04-11 15:57:50 +0000888 debug2("channel %d: decode socks4", c->self);
Ben Lindstrom2b261b92001-04-17 18:14:34 +0000889
890 have = buffer_len(&c->input);
891 len = sizeof(s4_req);
892 if (have < len)
893 return 0;
894 p = buffer_ptr(&c->input);
895 for (found = 0, i = len; i < have; i++) {
896 if (p[i] == '\0') {
897 found = 1;
898 break;
899 }
900 if (i > 1024) {
901 /* the peer is probably sending garbage */
902 debug("channel %d: decode socks4: too long",
903 c->self);
904 return -1;
905 }
906 }
907 if (!found)
908 return 0;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000909 buffer_get(&c->input, (char *)&s4_req.version, 1);
910 buffer_get(&c->input, (char *)&s4_req.command, 1);
911 buffer_get(&c->input, (char *)&s4_req.dest_port, 2);
Ben Lindstromb3921512001-04-11 15:57:50 +0000912 buffer_get(&c->input, (char *)&s4_req.dest_addr, 4);
Ben Lindstrom2b261b92001-04-17 18:14:34 +0000913 have = buffer_len(&c->input);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000914 p = buffer_ptr(&c->input);
915 len = strlen(p);
Ben Lindstrom6fa9d102001-04-11 23:08:17 +0000916 debug2("channel %d: decode socks4: user %s/%d", c->self, p, len);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000917 if (len > have)
Ben Lindstromb3921512001-04-11 15:57:50 +0000918 fatal("channel %d: decode socks4: len %d > have %d",
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000919 c->self, len, have);
920 strlcpy(username, p, sizeof(username));
921 buffer_consume(&c->input, len);
922 buffer_consume(&c->input, 1); /* trailing '\0' */
923
Ben Lindstromb3921512001-04-11 15:57:50 +0000924 host = inet_ntoa(s4_req.dest_addr);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000925 strlcpy(c->path, host, sizeof(c->path));
926 c->host_port = ntohs(s4_req.dest_port);
Damien Miller9f0f5c62001-12-21 14:45:46 +1100927
Ben Lindstrom6fa9d102001-04-11 23:08:17 +0000928 debug("channel %d: dynamic request: socks4 host %s port %u command %u",
929 c->self, host, c->host_port, s4_req.command);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000930
Ben Lindstromb3921512001-04-11 15:57:50 +0000931 if (s4_req.command != 1) {
932 debug("channel %d: cannot handle: socks4 cn %d",
933 c->self, s4_req.command);
934 return -1;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000935 }
Ben Lindstromb3921512001-04-11 15:57:50 +0000936 s4_rsp.version = 0; /* vn: 0 for reply */
937 s4_rsp.command = 90; /* cd: req granted */
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000938 s4_rsp.dest_port = 0; /* ignored */
Ben Lindstromb3921512001-04-11 15:57:50 +0000939 s4_rsp.dest_addr.s_addr = INADDR_ANY; /* ignored */
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000940 buffer_append(&c->output, (char *)&s4_rsp, sizeof(s4_rsp));
Ben Lindstromb3921512001-04-11 15:57:50 +0000941 return 1;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000942}
943
Ben Lindstromb3921512001-04-11 15:57:50 +0000944/* dynamic port forwarding */
Ben Lindstrombba81212001-06-25 05:01:22 +0000945static void
Ben Lindstromb3921512001-04-11 15:57:50 +0000946channel_pre_dynamic(Channel *c, fd_set * readset, fd_set * writeset)
947{
948 u_char *p;
949 int have, ret;
950
951 have = buffer_len(&c->input);
Damien Miller4623a752001-10-10 15:03:58 +1000952 c->delayed = 0;
Ben Lindstromb3921512001-04-11 15:57:50 +0000953 debug2("channel %d: pre_dynamic: have %d", c->self, have);
Ben Lindstromc486d882001-04-11 16:08:34 +0000954 /* buffer_dump(&c->input); */
Ben Lindstromb3921512001-04-11 15:57:50 +0000955 /* check if the fixed size part of the packet is in buffer. */
956 if (have < 4) {
957 /* need more */
958 FD_SET(c->sock, readset);
959 return;
960 }
961 /* try to guess the protocol */
962 p = buffer_ptr(&c->input);
963 switch (p[0]) {
Ben Lindstrom6fa9d102001-04-11 23:08:17 +0000964 case 0x04:
965 ret = channel_decode_socks4(c, readset, writeset);
966 break;
Ben Lindstromb3921512001-04-11 15:57:50 +0000967 default:
968 ret = -1;
969 break;
970 }
971 if (ret < 0) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000972 chan_mark_dead(c);
Ben Lindstromb3921512001-04-11 15:57:50 +0000973 } else if (ret == 0) {
974 debug2("channel %d: pre_dynamic: need more", c->self);
975 /* need more */
976 FD_SET(c->sock, readset);
977 } else {
978 /* switch to the next state */
979 c->type = SSH_CHANNEL_OPENING;
980 port_open_helper(c, "direct-tcpip");
981 }
982}
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000983
Damien Millerb38eff82000-04-01 11:09:21 +1000984/* This is our fake X11 server socket. */
Ben Lindstrombba81212001-06-25 05:01:22 +0000985static void
Damien Millerb38eff82000-04-01 11:09:21 +1000986channel_post_x11_listener(Channel *c, fd_set * readset, fd_set * writeset)
987{
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000988 Channel *nc;
Damien Millerb38eff82000-04-01 11:09:21 +1000989 struct sockaddr addr;
Damien Miller398e1cf2002-02-05 11:52:13 +1100990 int newsock;
Damien Millerb38eff82000-04-01 11:09:21 +1000991 socklen_t addrlen;
Damien Millerd83ff352001-01-30 09:19:34 +1100992 char buf[16384], *remote_ipaddr;
Damien Millerbd483e72000-04-30 10:00:53 +1000993 int remote_port;
Damien Millerb38eff82000-04-01 11:09:21 +1000994
995 if (FD_ISSET(c->sock, readset)) {
996 debug("X11 connection requested.");
997 addrlen = sizeof(addr);
998 newsock = accept(c->sock, &addr, &addrlen);
Damien Millere7378562001-12-21 14:58:35 +1100999 if (c->single_connection) {
1000 debug("single_connection: closing X11 listener.");
1001 channel_close_fd(&c->sock);
1002 chan_mark_dead(c);
1003 }
Damien Millerb38eff82000-04-01 11:09:21 +10001004 if (newsock < 0) {
1005 error("accept: %.100s", strerror(errno));
1006 return;
1007 }
Damien Miller398e1cf2002-02-05 11:52:13 +11001008 set_nodelay(newsock);
Damien Millerd83ff352001-01-30 09:19:34 +11001009 remote_ipaddr = get_peer_ipaddr(newsock);
Damien Millerbd483e72000-04-30 10:00:53 +10001010 remote_port = get_peer_port(newsock);
Damien Millerb38eff82000-04-01 11:09:21 +10001011 snprintf(buf, sizeof buf, "X11 connection from %.200s port %d",
Damien Millerd83ff352001-01-30 09:19:34 +11001012 remote_ipaddr, remote_port);
Damien Millerbd483e72000-04-30 10:00:53 +10001013
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001014 nc = channel_new("accepted x11 socket",
Damien Millerbd483e72000-04-30 10:00:53 +10001015 SSH_CHANNEL_OPENING, newsock, newsock, -1,
1016 c->local_window_max, c->local_maxpacket,
Damien Miller69b69aa2000-10-28 14:19:58 +11001017 0, xstrdup(buf), 1);
Damien Millerbd483e72000-04-30 10:00:53 +10001018 if (compat20) {
1019 packet_start(SSH2_MSG_CHANNEL_OPEN);
1020 packet_put_cstring("x11");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001021 packet_put_int(nc->self);
Damien Millere7378562001-12-21 14:58:35 +11001022 packet_put_int(nc->local_window_max);
1023 packet_put_int(nc->local_maxpacket);
Damien Millerd83ff352001-01-30 09:19:34 +11001024 /* originator ipaddr and port */
1025 packet_put_cstring(remote_ipaddr);
Damien Miller30c3d422000-05-09 11:02:59 +10001026 if (datafellows & SSH_BUG_X11FWD) {
1027 debug("ssh2 x11 bug compat mode");
1028 } else {
1029 packet_put_int(remote_port);
1030 }
Damien Millerbd483e72000-04-30 10:00:53 +10001031 packet_send();
1032 } else {
1033 packet_start(SSH_SMSG_X11_OPEN);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001034 packet_put_int(nc->self);
Ben Lindstrome9c99912001-06-09 00:41:05 +00001035 if (packet_get_protocol_flags() &
1036 SSH_PROTOFLAG_HOST_IN_FWD_OPEN)
Ben Lindstrom664408d2001-06-09 01:42:01 +00001037 packet_put_cstring(buf);
Damien Millerbd483e72000-04-30 10:00:53 +10001038 packet_send();
1039 }
Damien Millerd83ff352001-01-30 09:19:34 +11001040 xfree(remote_ipaddr);
Damien Millerb38eff82000-04-01 11:09:21 +10001041 }
1042}
1043
Ben Lindstrombba81212001-06-25 05:01:22 +00001044static void
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001045port_open_helper(Channel *c, char *rtype)
1046{
1047 int direct;
1048 char buf[1024];
1049 char *remote_ipaddr = get_peer_ipaddr(c->sock);
1050 u_short remote_port = get_peer_port(c->sock);
1051
1052 direct = (strcmp(rtype, "direct-tcpip") == 0);
1053
1054 snprintf(buf, sizeof buf,
1055 "%s: listening port %d for %.100s port %d, "
1056 "connect from %.200s port %d",
1057 rtype, c->listening_port, c->path, c->host_port,
1058 remote_ipaddr, remote_port);
1059
1060 xfree(c->remote_name);
1061 c->remote_name = xstrdup(buf);
1062
1063 if (compat20) {
1064 packet_start(SSH2_MSG_CHANNEL_OPEN);
1065 packet_put_cstring(rtype);
1066 packet_put_int(c->self);
1067 packet_put_int(c->local_window_max);
1068 packet_put_int(c->local_maxpacket);
1069 if (direct) {
1070 /* target host, port */
1071 packet_put_cstring(c->path);
1072 packet_put_int(c->host_port);
1073 } else {
1074 /* listen address, port */
1075 packet_put_cstring(c->path);
1076 packet_put_int(c->listening_port);
1077 }
1078 /* originator host and port */
1079 packet_put_cstring(remote_ipaddr);
1080 packet_put_int(remote_port);
1081 packet_send();
1082 } else {
1083 packet_start(SSH_MSG_PORT_OPEN);
1084 packet_put_int(c->self);
1085 packet_put_cstring(c->path);
1086 packet_put_int(c->host_port);
Ben Lindstrome9c99912001-06-09 00:41:05 +00001087 if (packet_get_protocol_flags() &
1088 SSH_PROTOFLAG_HOST_IN_FWD_OPEN)
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001089 packet_put_cstring(c->remote_name);
1090 packet_send();
1091 }
1092 xfree(remote_ipaddr);
1093}
1094
Damien Millerb38eff82000-04-01 11:09:21 +10001095/*
1096 * This socket is listening for connections to a forwarded TCP/IP port.
1097 */
Ben Lindstrombba81212001-06-25 05:01:22 +00001098static void
Damien Millerb38eff82000-04-01 11:09:21 +10001099channel_post_port_listener(Channel *c, fd_set * readset, fd_set * writeset)
1100{
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001101 Channel *nc;
Damien Millerb38eff82000-04-01 11:09:21 +10001102 struct sockaddr addr;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001103 int newsock, nextstate;
Damien Millerb38eff82000-04-01 11:09:21 +10001104 socklen_t addrlen;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001105 char *rtype;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001106
Damien Millerb38eff82000-04-01 11:09:21 +10001107 if (FD_ISSET(c->sock, readset)) {
1108 debug("Connection to port %d forwarding "
1109 "to %.100s port %d requested.",
1110 c->listening_port, c->path, c->host_port);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001111
Damien Miller4623a752001-10-10 15:03:58 +10001112 if (c->type == SSH_CHANNEL_RPORT_LISTENER) {
1113 nextstate = SSH_CHANNEL_OPENING;
1114 rtype = "forwarded-tcpip";
1115 } else {
1116 if (c->host_port == 0) {
1117 nextstate = SSH_CHANNEL_DYNAMIC;
Damien Millerd3c04b92001-10-10 15:04:20 +10001118 rtype = "dynamic-tcpip";
Damien Miller4623a752001-10-10 15:03:58 +10001119 } else {
1120 nextstate = SSH_CHANNEL_OPENING;
1121 rtype = "direct-tcpip";
1122 }
1123 }
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001124
Damien Millerb38eff82000-04-01 11:09:21 +10001125 addrlen = sizeof(addr);
1126 newsock = accept(c->sock, &addr, &addrlen);
1127 if (newsock < 0) {
1128 error("accept: %.100s", strerror(errno));
1129 return;
1130 }
Ben Lindstrom1ebd7a52002-02-26 18:12:51 +00001131 set_nodelay(newsock);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001132 nc = channel_new(rtype,
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001133 nextstate, newsock, newsock, -1,
Damien Millerb38eff82000-04-01 11:09:21 +10001134 c->local_window_max, c->local_maxpacket,
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001135 0, xstrdup(rtype), 1);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001136 nc->listening_port = c->listening_port;
1137 nc->host_port = c->host_port;
1138 strlcpy(nc->path, c->path, sizeof(nc->path));
1139
Damien Miller4623a752001-10-10 15:03:58 +10001140 if (nextstate == SSH_CHANNEL_DYNAMIC) {
1141 /*
1142 * do not call the channel_post handler until
1143 * this flag has been reset by a pre-handler.
1144 * otherwise the FD_ISSET calls might overflow
1145 */
1146 nc->delayed = 1;
1147 } else {
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001148 port_open_helper(nc, rtype);
Damien Miller4623a752001-10-10 15:03:58 +10001149 }
Damien Millerb38eff82000-04-01 11:09:21 +10001150 }
1151}
1152
1153/*
1154 * This is the authentication agent socket listening for connections from
1155 * clients.
1156 */
Ben Lindstrombba81212001-06-25 05:01:22 +00001157static void
Damien Millerb38eff82000-04-01 11:09:21 +10001158channel_post_auth_listener(Channel *c, fd_set * readset, fd_set * writeset)
1159{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001160 Channel *nc;
Ben Lindstrome9c99912001-06-09 00:41:05 +00001161 char *name;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001162 int newsock;
Damien Millerb38eff82000-04-01 11:09:21 +10001163 struct sockaddr addr;
Damien Millerb38eff82000-04-01 11:09:21 +10001164 socklen_t addrlen;
1165
1166 if (FD_ISSET(c->sock, readset)) {
1167 addrlen = sizeof(addr);
1168 newsock = accept(c->sock, &addr, &addrlen);
1169 if (newsock < 0) {
1170 error("accept from auth socket: %.100s", strerror(errno));
1171 return;
1172 }
Ben Lindstrome9c99912001-06-09 00:41:05 +00001173 name = xstrdup("accepted auth socket");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001174 nc = channel_new("accepted auth socket",
Damien Miller0bc1bd82000-11-13 22:57:25 +11001175 SSH_CHANNEL_OPENING, newsock, newsock, -1,
1176 c->local_window_max, c->local_maxpacket,
Ben Lindstrome9c99912001-06-09 00:41:05 +00001177 0, name, 1);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001178 if (compat20) {
1179 packet_start(SSH2_MSG_CHANNEL_OPEN);
1180 packet_put_cstring("auth-agent@openssh.com");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001181 packet_put_int(nc->self);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001182 packet_put_int(c->local_window_max);
1183 packet_put_int(c->local_maxpacket);
1184 } else {
1185 packet_start(SSH_SMSG_AGENT_OPEN);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001186 packet_put_int(nc->self);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001187 }
Damien Millerb38eff82000-04-01 11:09:21 +10001188 packet_send();
1189 }
1190}
1191
Ben Lindstrombba81212001-06-25 05:01:22 +00001192static void
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001193channel_post_connecting(Channel *c, fd_set * readset, fd_set * writeset)
1194{
Ben Lindstrom69128662001-05-08 20:07:39 +00001195 int err = 0;
Ben Lindstrom11180952001-07-04 05:13:35 +00001196 socklen_t sz = sizeof(err);
Ben Lindstrom69128662001-05-08 20:07:39 +00001197
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001198 if (FD_ISSET(c->sock, writeset)) {
Ben Lindstrom733a2352002-03-05 01:31:28 +00001199 if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, &err, &sz) < 0) {
Ben Lindstrom69128662001-05-08 20:07:39 +00001200 err = errno;
1201 error("getsockopt SO_ERROR failed");
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001202 }
Ben Lindstrom69128662001-05-08 20:07:39 +00001203 if (err == 0) {
1204 debug("channel %d: connected", c->self);
1205 c->type = SSH_CHANNEL_OPEN;
1206 if (compat20) {
1207 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1208 packet_put_int(c->remote_id);
1209 packet_put_int(c->self);
1210 packet_put_int(c->local_window);
1211 packet_put_int(c->local_maxpacket);
1212 } else {
1213 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1214 packet_put_int(c->remote_id);
1215 packet_put_int(c->self);
1216 }
1217 } else {
1218 debug("channel %d: not connected: %s",
1219 c->self, strerror(err));
1220 if (compat20) {
1221 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1222 packet_put_int(c->remote_id);
1223 packet_put_int(SSH2_OPEN_CONNECT_FAILED);
1224 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1225 packet_put_cstring(strerror(err));
1226 packet_put_cstring("");
1227 }
1228 } else {
1229 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1230 packet_put_int(c->remote_id);
1231 }
1232 chan_mark_dead(c);
1233 }
1234 packet_send();
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001235 }
1236}
1237
Ben Lindstrombba81212001-06-25 05:01:22 +00001238static int
Damien Millerb38eff82000-04-01 11:09:21 +10001239channel_handle_rfd(Channel *c, fd_set * readset, fd_set * writeset)
1240{
1241 char buf[16*1024];
1242 int len;
1243
Ben Lindstromc0dee1a2001-06-05 20:52:50 +00001244 if (c->rfd != -1 &&
Damien Millerb38eff82000-04-01 11:09:21 +10001245 FD_ISSET(c->rfd, readset)) {
1246 len = read(c->rfd, buf, sizeof(buf));
Damien Miller6f83b8e2000-05-02 09:23:45 +10001247 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1248 return 1;
Damien Millerb38eff82000-04-01 11:09:21 +10001249 if (len <= 0) {
Damien Millerbd483e72000-04-30 10:00:53 +10001250 debug("channel %d: read<=0 rfd %d len %d",
Damien Millerb38eff82000-04-01 11:09:21 +10001251 c->self, c->rfd, len);
Ben Lindstromb3921512001-04-11 15:57:50 +00001252 if (c->type != SSH_CHANNEL_OPEN) {
1253 debug("channel %d: not open", c->self);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001254 chan_mark_dead(c);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001255 return -1;
Ben Lindstromb3921512001-04-11 15:57:50 +00001256 } else if (compat13) {
Damien Miller76765c02002-01-22 23:21:15 +11001257 buffer_clear(&c->output);
Damien Millerb38eff82000-04-01 11:09:21 +10001258 c->type = SSH_CHANNEL_INPUT_DRAINING;
Ben Lindstrome9c99912001-06-09 00:41:05 +00001259 debug("channel %d: input draining.", c->self);
Damien Millerb38eff82000-04-01 11:09:21 +10001260 } else {
1261 chan_read_failed(c);
1262 }
1263 return -1;
1264 }
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00001265 if (c->input_filter != NULL) {
Damien Millerad833b32000-08-23 10:46:23 +10001266 if (c->input_filter(c, buf, len) == -1) {
Ben Lindstromc486d882001-04-11 16:08:34 +00001267 debug("channel %d: filter stops", c->self);
Damien Millerad833b32000-08-23 10:46:23 +10001268 chan_read_failed(c);
1269 }
1270 } else {
1271 buffer_append(&c->input, buf, len);
1272 }
Damien Millerb38eff82000-04-01 11:09:21 +10001273 }
1274 return 1;
1275}
Ben Lindstrombba81212001-06-25 05:01:22 +00001276static int
Damien Millerb38eff82000-04-01 11:09:21 +10001277channel_handle_wfd(Channel *c, fd_set * readset, fd_set * writeset)
1278{
Ben Lindstrome229b252001-03-05 06:28:06 +00001279 struct termios tio;
Ben Lindstrom6d218f42001-09-18 05:53:12 +00001280 u_char *data;
1281 u_int dlen;
Damien Millerb38eff82000-04-01 11:09:21 +10001282 int len;
1283
1284 /* Send buffered output data to the socket. */
Ben Lindstromc0dee1a2001-06-05 20:52:50 +00001285 if (c->wfd != -1 &&
Damien Millerb38eff82000-04-01 11:09:21 +10001286 FD_ISSET(c->wfd, writeset) &&
1287 buffer_len(&c->output) > 0) {
Ben Lindstrom6d218f42001-09-18 05:53:12 +00001288 data = buffer_ptr(&c->output);
1289 dlen = buffer_len(&c->output);
Ben Lindstrom92ea0ea2002-07-04 18:11:09 +00001290#ifdef _AIX
1291 /* XXX: Later AIX versions can't push as much data to tty */
Ben Lindstrombeb5f332002-07-22 15:28:53 +00001292 if (compat20 && c->wfd_isatty && dlen > 8*1024)
Ben Lindstrom92ea0ea2002-07-04 18:11:09 +00001293 dlen = 8*1024;
1294#endif
Ben Lindstrombeb5f332002-07-22 15:28:53 +00001295 len = write(c->wfd, data, dlen);
Damien Miller6f83b8e2000-05-02 09:23:45 +10001296 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1297 return 1;
Damien Millerb38eff82000-04-01 11:09:21 +10001298 if (len <= 0) {
Ben Lindstromb3921512001-04-11 15:57:50 +00001299 if (c->type != SSH_CHANNEL_OPEN) {
1300 debug("channel %d: not open", c->self);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001301 chan_mark_dead(c);
Ben Lindstromb3921512001-04-11 15:57:50 +00001302 return -1;
1303 } else if (compat13) {
Damien Miller76765c02002-01-22 23:21:15 +11001304 buffer_clear(&c->output);
Ben Lindstrome9c99912001-06-09 00:41:05 +00001305 debug("channel %d: input draining.", c->self);
Damien Millerb38eff82000-04-01 11:09:21 +10001306 c->type = SSH_CHANNEL_INPUT_DRAINING;
1307 } else {
1308 chan_write_failed(c);
1309 }
1310 return -1;
1311 }
Ben Lindstrom6d218f42001-09-18 05:53:12 +00001312 if (compat20 && c->isatty && dlen >= 1 && data[0] != '\r') {
Damien Miller79438cc2001-02-16 12:34:57 +11001313 if (tcgetattr(c->wfd, &tio) == 0 &&
1314 !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) {
1315 /*
1316 * Simulate echo to reduce the impact of
Ben Lindstromb40204b2001-03-05 06:29:44 +00001317 * traffic analysis. We need to match the
Ben Lindstrome229b252001-03-05 06:28:06 +00001318 * size of a SSH2_MSG_CHANNEL_DATA message
1319 * (4 byte channel id + data)
Damien Miller79438cc2001-02-16 12:34:57 +11001320 */
Ben Lindstrome229b252001-03-05 06:28:06 +00001321 packet_send_ignore(4 + len);
Damien Miller79438cc2001-02-16 12:34:57 +11001322 packet_send();
Damien Miller79438cc2001-02-16 12:34:57 +11001323 }
1324 }
Damien Millerb38eff82000-04-01 11:09:21 +10001325 buffer_consume(&c->output, len);
Damien Miller33b13562000-04-04 14:38:59 +10001326 if (compat20 && len > 0) {
1327 c->local_consumed += len;
1328 }
1329 }
1330 return 1;
1331}
Ben Lindstrombba81212001-06-25 05:01:22 +00001332static int
Damien Miller33b13562000-04-04 14:38:59 +10001333channel_handle_efd(Channel *c, fd_set * readset, fd_set * writeset)
1334{
1335 char buf[16*1024];
1336 int len;
1337
Damien Miller1383bd82000-04-06 12:32:37 +10001338/** XXX handle drain efd, too */
Damien Miller33b13562000-04-04 14:38:59 +10001339 if (c->efd != -1) {
1340 if (c->extended_usage == CHAN_EXTENDED_WRITE &&
1341 FD_ISSET(c->efd, writeset) &&
1342 buffer_len(&c->extended) > 0) {
1343 len = write(c->efd, buffer_ptr(&c->extended),
1344 buffer_len(&c->extended));
Damien Millerd3444942000-09-30 14:20:03 +11001345 debug2("channel %d: written %d to efd %d",
Damien Miller33b13562000-04-04 14:38:59 +10001346 c->self, len, c->efd);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001347 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1348 return 1;
1349 if (len <= 0) {
1350 debug2("channel %d: closing write-efd %d",
1351 c->self, c->efd);
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001352 channel_close_fd(&c->efd);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001353 } else {
Damien Miller33b13562000-04-04 14:38:59 +10001354 buffer_consume(&c->extended, len);
1355 c->local_consumed += len;
1356 }
1357 } else if (c->extended_usage == CHAN_EXTENDED_READ &&
1358 FD_ISSET(c->efd, readset)) {
1359 len = read(c->efd, buf, sizeof(buf));
Damien Millerd3444942000-09-30 14:20:03 +11001360 debug2("channel %d: read %d from efd %d",
Damien Miller9f0f5c62001-12-21 14:45:46 +11001361 c->self, len, c->efd);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001362 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1363 return 1;
1364 if (len <= 0) {
1365 debug2("channel %d: closing read-efd %d",
Damien Miller1383bd82000-04-06 12:32:37 +10001366 c->self, c->efd);
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001367 channel_close_fd(&c->efd);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001368 } else {
Damien Miller33b13562000-04-04 14:38:59 +10001369 buffer_append(&c->extended, buf, len);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001370 }
Damien Miller33b13562000-04-04 14:38:59 +10001371 }
1372 }
1373 return 1;
1374}
Ben Lindstrombba81212001-06-25 05:01:22 +00001375static int
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001376channel_check_window(Channel *c)
Damien Miller33b13562000-04-04 14:38:59 +10001377{
Ben Lindstromb3921512001-04-11 15:57:50 +00001378 if (c->type == SSH_CHANNEL_OPEN &&
1379 !(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) &&
Damien Miller33b13562000-04-04 14:38:59 +10001380 c->local_window < c->local_window_max/2 &&
1381 c->local_consumed > 0) {
1382 packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
1383 packet_put_int(c->remote_id);
1384 packet_put_int(c->local_consumed);
1385 packet_send();
Damien Millerd3444942000-09-30 14:20:03 +11001386 debug2("channel %d: window %d sent adjust %d",
Damien Miller33b13562000-04-04 14:38:59 +10001387 c->self, c->local_window,
1388 c->local_consumed);
1389 c->local_window += c->local_consumed;
1390 c->local_consumed = 0;
Damien Millerb38eff82000-04-01 11:09:21 +10001391 }
1392 return 1;
1393}
1394
Ben Lindstrombba81212001-06-25 05:01:22 +00001395static void
Damien Millerde6987c2002-01-22 23:20:40 +11001396channel_post_open(Channel *c, fd_set * readset, fd_set * writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001397{
Damien Miller4623a752001-10-10 15:03:58 +10001398 if (c->delayed)
1399 return;
Damien Millerb38eff82000-04-01 11:09:21 +10001400 channel_handle_rfd(c, readset, writeset);
1401 channel_handle_wfd(c, readset, writeset);
Damien Millerde6987c2002-01-22 23:20:40 +11001402 if (!compat20)
Damien Miller4623a752001-10-10 15:03:58 +10001403 return;
Damien Miller33b13562000-04-04 14:38:59 +10001404 channel_handle_efd(c, readset, writeset);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001405 channel_check_window(c);
Damien Miller33b13562000-04-04 14:38:59 +10001406}
1407
Ben Lindstrombba81212001-06-25 05:01:22 +00001408static void
Damien Millerb38eff82000-04-01 11:09:21 +10001409channel_post_output_drain_13(Channel *c, fd_set * readset, fd_set * writeset)
1410{
1411 int len;
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +00001412
Damien Millerb38eff82000-04-01 11:09:21 +10001413 /* Send buffered output data to the socket. */
1414 if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) {
1415 len = write(c->sock, buffer_ptr(&c->output),
1416 buffer_len(&c->output));
1417 if (len <= 0)
Damien Miller76765c02002-01-22 23:21:15 +11001418 buffer_clear(&c->output);
Damien Millerb38eff82000-04-01 11:09:21 +10001419 else
1420 buffer_consume(&c->output, len);
1421 }
1422}
1423
Ben Lindstrombba81212001-06-25 05:01:22 +00001424static void
Damien Miller33b13562000-04-04 14:38:59 +10001425channel_handler_init_20(void)
1426{
Damien Millerde6987c2002-01-22 23:20:40 +11001427 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open;
Damien Millerbd483e72000-04-30 10:00:53 +10001428 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open;
Damien Miller33b13562000-04-04 14:38:59 +10001429 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001430 channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener;
Damien Millerbd483e72000-04-30 10:00:53 +10001431 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001432 channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001433 channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001434 channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
Damien Miller33b13562000-04-04 14:38:59 +10001435
Damien Millerde6987c2002-01-22 23:20:40 +11001436 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open;
Damien Miller33b13562000-04-04 14:38:59 +10001437 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001438 channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener;
Damien Millerbd483e72000-04-30 10:00:53 +10001439 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001440 channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001441 channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
Damien Millerde6987c2002-01-22 23:20:40 +11001442 channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open;
Damien Miller33b13562000-04-04 14:38:59 +10001443}
1444
Ben Lindstrombba81212001-06-25 05:01:22 +00001445static void
Damien Millerb38eff82000-04-01 11:09:21 +10001446channel_handler_init_13(void)
1447{
1448 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13;
1449 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_13;
1450 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
1451 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
1452 channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
1453 channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining;
1454 channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001455 channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001456 channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
Damien Millerb38eff82000-04-01 11:09:21 +10001457
Damien Millerde6987c2002-01-22 23:20:40 +11001458 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open;
Damien Millerb38eff82000-04-01 11:09:21 +10001459 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
1460 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
1461 channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
1462 channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001463 channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
Damien Millerde6987c2002-01-22 23:20:40 +11001464 channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open;
Damien Millerb38eff82000-04-01 11:09:21 +10001465}
1466
Ben Lindstrombba81212001-06-25 05:01:22 +00001467static void
Damien Millerb38eff82000-04-01 11:09:21 +10001468channel_handler_init_15(void)
1469{
Damien Millerde6987c2002-01-22 23:20:40 +11001470 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open;
Damien Millerbd483e72000-04-30 10:00:53 +10001471 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open;
Damien Millerb38eff82000-04-01 11:09:21 +10001472 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
1473 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
1474 channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001475 channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001476 channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
Damien Millerb38eff82000-04-01 11:09:21 +10001477
1478 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
1479 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
1480 channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
Damien Millerde6987c2002-01-22 23:20:40 +11001481 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001482 channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
Damien Millerde6987c2002-01-22 23:20:40 +11001483 channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open;
Damien Millerb38eff82000-04-01 11:09:21 +10001484}
1485
Ben Lindstrombba81212001-06-25 05:01:22 +00001486static void
Damien Millerb38eff82000-04-01 11:09:21 +10001487channel_handler_init(void)
1488{
1489 int i;
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +00001490
Damien Miller9f0f5c62001-12-21 14:45:46 +11001491 for (i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) {
Damien Millerb38eff82000-04-01 11:09:21 +10001492 channel_pre[i] = NULL;
1493 channel_post[i] = NULL;
1494 }
Damien Miller33b13562000-04-04 14:38:59 +10001495 if (compat20)
1496 channel_handler_init_20();
1497 else if (compat13)
Damien Millerb38eff82000-04-01 11:09:21 +10001498 channel_handler_init_13();
1499 else
1500 channel_handler_init_15();
1501}
1502
Damien Miller3ec27592001-10-12 11:35:04 +10001503/* gc dead channels */
1504static void
1505channel_garbage_collect(Channel *c)
1506{
1507 if (c == NULL)
1508 return;
1509 if (c->detach_user != NULL) {
1510 if (!chan_is_dead(c, 0))
1511 return;
1512 debug("channel %d: gc: notify user", c->self);
1513 c->detach_user(c->self, NULL);
1514 /* if we still have a callback */
1515 if (c->detach_user != NULL)
1516 return;
1517 debug("channel %d: gc: user detached", c->self);
1518 }
1519 if (!chan_is_dead(c, 1))
1520 return;
1521 debug("channel %d: garbage collecting", c->self);
1522 channel_free(c);
1523}
1524
Ben Lindstrombba81212001-06-25 05:01:22 +00001525static void
Damien Millerb38eff82000-04-01 11:09:21 +10001526channel_handler(chan_fn *ftab[], fd_set * readset, fd_set * writeset)
1527{
1528 static int did_init = 0;
1529 int i;
1530 Channel *c;
1531
1532 if (!did_init) {
1533 channel_handler_init();
1534 did_init = 1;
1535 }
1536 for (i = 0; i < channels_alloc; i++) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001537 c = channels[i];
1538 if (c == NULL)
Damien Millerb38eff82000-04-01 11:09:21 +10001539 continue;
Ben Lindstromc0dee1a2001-06-05 20:52:50 +00001540 if (ftab[c->type] != NULL)
1541 (*ftab[c->type])(c, readset, writeset);
Damien Miller3ec27592001-10-12 11:35:04 +10001542 channel_garbage_collect(c);
Damien Millerb38eff82000-04-01 11:09:21 +10001543 }
1544}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001545
Ben Lindstrome9c99912001-06-09 00:41:05 +00001546/*
1547 * Allocate/update select bitmasks and add any bits relevant to channels in
1548 * select bitmasks.
1549 */
Damien Miller4af51302000-04-16 11:18:38 +10001550void
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001551channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp,
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001552 int *nallocp, int rekeying)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001553{
Damien Miller5e953212001-01-30 09:14:00 +11001554 int n;
1555 u_int sz;
1556
1557 n = MAX(*maxfdp, channel_max_fd);
1558
1559 sz = howmany(n+1, NFDBITS) * sizeof(fd_mask);
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001560 /* perhaps check sz < nalloc/2 and shrink? */
1561 if (*readsetp == NULL || sz > *nallocp) {
1562 *readsetp = xrealloc(*readsetp, sz);
1563 *writesetp = xrealloc(*writesetp, sz);
1564 *nallocp = sz;
Damien Miller5e953212001-01-30 09:14:00 +11001565 }
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001566 *maxfdp = n;
Damien Miller5e953212001-01-30 09:14:00 +11001567 memset(*readsetp, 0, sz);
1568 memset(*writesetp, 0, sz);
1569
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001570 if (!rekeying)
1571 channel_handler(channel_pre, *readsetp, *writesetp);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001572}
1573
Ben Lindstrome9c99912001-06-09 00:41:05 +00001574/*
1575 * After select, perform any appropriate operations for channels which have
1576 * events pending.
1577 */
Damien Miller4af51302000-04-16 11:18:38 +10001578void
Damien Miller95def091999-11-25 00:26:21 +11001579channel_after_select(fd_set * readset, fd_set * writeset)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001580{
Damien Millerb38eff82000-04-01 11:09:21 +10001581 channel_handler(channel_post, readset, writeset);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001582}
1583
Ben Lindstrome9c99912001-06-09 00:41:05 +00001584
Damien Miller5e953212001-01-30 09:14:00 +11001585/* If there is data to send to the connection, enqueue some of it now. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001586
Damien Miller4af51302000-04-16 11:18:38 +10001587void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00001588channel_output_poll(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001589{
Damien Millerb38eff82000-04-01 11:09:21 +10001590 Channel *c;
Ben Lindstrom4fed2be2002-06-25 23:17:36 +00001591 int i;
1592 u_int len;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001593
Damien Miller95def091999-11-25 00:26:21 +11001594 for (i = 0; i < channels_alloc; i++) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001595 c = channels[i];
1596 if (c == NULL)
1597 continue;
Damien Miller34132e52000-01-14 15:45:46 +11001598
Ben Lindstrome9c99912001-06-09 00:41:05 +00001599 /*
1600 * We are only interested in channels that can have buffered
1601 * incoming data.
1602 */
Damien Miller34132e52000-01-14 15:45:46 +11001603 if (compat13) {
Damien Millerb38eff82000-04-01 11:09:21 +10001604 if (c->type != SSH_CHANNEL_OPEN &&
1605 c->type != SSH_CHANNEL_INPUT_DRAINING)
Damien Miller34132e52000-01-14 15:45:46 +11001606 continue;
1607 } else {
Damien Millerb38eff82000-04-01 11:09:21 +10001608 if (c->type != SSH_CHANNEL_OPEN)
Damien Miller34132e52000-01-14 15:45:46 +11001609 continue;
Damien Miller34132e52000-01-14 15:45:46 +11001610 }
Damien Millerefb4afe2000-04-12 18:45:05 +10001611 if (compat20 &&
1612 (c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) {
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001613 /* XXX is this true? */
Damien Miller3ec27592001-10-12 11:35:04 +10001614 debug3("channel %d: will not send data after close", c->self);
Damien Miller33b13562000-04-04 14:38:59 +10001615 continue;
1616 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001617
Damien Miller95def091999-11-25 00:26:21 +11001618 /* Get the amount of buffered data for this channel. */
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001619 if ((c->istate == CHAN_INPUT_OPEN ||
1620 c->istate == CHAN_INPUT_WAIT_DRAIN) &&
1621 (len = buffer_len(&c->input)) > 0) {
Ben Lindstrome9c99912001-06-09 00:41:05 +00001622 /*
1623 * Send some data for the other side over the secure
1624 * connection.
1625 */
Damien Miller33b13562000-04-04 14:38:59 +10001626 if (compat20) {
1627 if (len > c->remote_window)
1628 len = c->remote_window;
1629 if (len > c->remote_maxpacket)
1630 len = c->remote_maxpacket;
Damien Miller95def091999-11-25 00:26:21 +11001631 } else {
Damien Miller33b13562000-04-04 14:38:59 +10001632 if (packet_is_interactive()) {
1633 if (len > 1024)
1634 len = 512;
1635 } else {
1636 /* Keep the packets at reasonable size. */
1637 if (len > packet_get_maxsize()/2)
1638 len = packet_get_maxsize()/2;
1639 }
Damien Miller95def091999-11-25 00:26:21 +11001640 }
Damien Millerb38eff82000-04-01 11:09:21 +10001641 if (len > 0) {
Damien Miller33b13562000-04-04 14:38:59 +10001642 packet_start(compat20 ?
1643 SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA);
Damien Millerb38eff82000-04-01 11:09:21 +10001644 packet_put_int(c->remote_id);
1645 packet_put_string(buffer_ptr(&c->input), len);
1646 packet_send();
1647 buffer_consume(&c->input, len);
1648 c->remote_window -= len;
Damien Millerb38eff82000-04-01 11:09:21 +10001649 }
1650 } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) {
Damien Miller95def091999-11-25 00:26:21 +11001651 if (compat13)
1652 fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3");
Damien Miller5428f641999-11-25 11:54:57 +11001653 /*
1654 * input-buffer is empty and read-socket shutdown:
Ben Lindstromcf159442002-03-26 03:26:24 +00001655 * tell peer, that we will not send more data: send IEOF.
1656 * hack for extended data: delay EOF if EFD still in use.
Damien Miller5428f641999-11-25 11:54:57 +11001657 */
Ben Lindstromcf159442002-03-26 03:26:24 +00001658 if (CHANNEL_EFD_INPUT_ACTIVE(c))
Ben Lindstrom5a6abda2002-06-09 19:41:48 +00001659 debug2("channel %d: ibuf_empty delayed efd %d/(%d)",
1660 c->self, c->efd, buffer_len(&c->extended));
Ben Lindstromcf159442002-03-26 03:26:24 +00001661 else
1662 chan_ibuf_empty(c);
Damien Miller95def091999-11-25 00:26:21 +11001663 }
Damien Miller33b13562000-04-04 14:38:59 +10001664 /* Send extended data, i.e. stderr */
1665 if (compat20 &&
Ben Lindstromcf159442002-03-26 03:26:24 +00001666 !(c->flags & CHAN_EOF_SENT) &&
Damien Miller33b13562000-04-04 14:38:59 +10001667 c->remote_window > 0 &&
1668 (len = buffer_len(&c->extended)) > 0 &&
1669 c->extended_usage == CHAN_EXTENDED_READ) {
Ben Lindstrom4fed2be2002-06-25 23:17:36 +00001670 debug2("channel %d: rwin %u elen %u euse %d",
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001671 c->self, c->remote_window, buffer_len(&c->extended),
1672 c->extended_usage);
Damien Miller33b13562000-04-04 14:38:59 +10001673 if (len > c->remote_window)
1674 len = c->remote_window;
1675 if (len > c->remote_maxpacket)
1676 len = c->remote_maxpacket;
1677 packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA);
1678 packet_put_int(c->remote_id);
1679 packet_put_int(SSH2_EXTENDED_DATA_STDERR);
1680 packet_put_string(buffer_ptr(&c->extended), len);
1681 packet_send();
1682 buffer_consume(&c->extended, len);
1683 c->remote_window -= len;
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001684 debug2("channel %d: sent ext data %d", c->self, len);
Damien Miller33b13562000-04-04 14:38:59 +10001685 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001686 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001687}
1688
Ben Lindstrome9c99912001-06-09 00:41:05 +00001689
1690/* -- protocol input */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001691
Damien Miller4af51302000-04-16 11:18:38 +10001692void
Damien Miller630d6f42002-01-22 23:17:30 +11001693channel_input_data(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001694{
Damien Miller34132e52000-01-14 15:45:46 +11001695 int id;
Damien Miller95def091999-11-25 00:26:21 +11001696 char *data;
Ben Lindstrom46c16222000-12-22 01:43:59 +00001697 u_int data_len;
Damien Millerb38eff82000-04-01 11:09:21 +10001698 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001699
Damien Miller95def091999-11-25 00:26:21 +11001700 /* Get the channel number and verify it. */
Damien Miller34132e52000-01-14 15:45:46 +11001701 id = packet_get_int();
Damien Millerb38eff82000-04-01 11:09:21 +10001702 c = channel_lookup(id);
1703 if (c == NULL)
Damien Miller34132e52000-01-14 15:45:46 +11001704 packet_disconnect("Received data for nonexistent channel %d.", id);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001705
Damien Miller95def091999-11-25 00:26:21 +11001706 /* Ignore any data for non-open channels (might happen on close) */
Damien Millerb38eff82000-04-01 11:09:21 +10001707 if (c->type != SSH_CHANNEL_OPEN &&
1708 c->type != SSH_CHANNEL_X11_OPEN)
Damien Miller34132e52000-01-14 15:45:46 +11001709 return;
1710
1711 /* same for protocol 1.5 if output end is no longer open */
Damien Millerb38eff82000-04-01 11:09:21 +10001712 if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN)
Damien Miller95def091999-11-25 00:26:21 +11001713 return;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001714
Damien Miller95def091999-11-25 00:26:21 +11001715 /* Get the data. */
1716 data = packet_get_string(&data_len);
Damien Millerb38eff82000-04-01 11:09:21 +10001717
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00001718 if (compat20) {
Damien Miller33b13562000-04-04 14:38:59 +10001719 if (data_len > c->local_maxpacket) {
1720 log("channel %d: rcvd big packet %d, maxpack %d",
1721 c->self, data_len, c->local_maxpacket);
1722 }
1723 if (data_len > c->local_window) {
1724 log("channel %d: rcvd too much data %d, win %d",
1725 c->self, data_len, c->local_window);
1726 xfree(data);
1727 return;
1728 }
1729 c->local_window -= data_len;
Damien Miller33b13562000-04-04 14:38:59 +10001730 }
Damien Miller48b03fc2002-01-22 23:11:40 +11001731 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10001732 buffer_append(&c->output, data, data_len);
Damien Miller95def091999-11-25 00:26:21 +11001733 xfree(data);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001734}
Ben Lindstrome9c99912001-06-09 00:41:05 +00001735
Damien Miller4af51302000-04-16 11:18:38 +10001736void
Damien Miller630d6f42002-01-22 23:17:30 +11001737channel_input_extended_data(int type, u_int32_t seq, void *ctxt)
Damien Miller33b13562000-04-04 14:38:59 +10001738{
1739 int id;
Damien Miller33b13562000-04-04 14:38:59 +10001740 char *data;
Ben Lindstromdaa21792002-06-25 23:15:30 +00001741 u_int data_len, tcode;
Damien Miller33b13562000-04-04 14:38:59 +10001742 Channel *c;
1743
1744 /* Get the channel number and verify it. */
1745 id = packet_get_int();
1746 c = channel_lookup(id);
1747
1748 if (c == NULL)
1749 packet_disconnect("Received extended_data for bad channel %d.", id);
1750 if (c->type != SSH_CHANNEL_OPEN) {
1751 log("channel %d: ext data for non open", id);
1752 return;
1753 }
Ben Lindstromcf159442002-03-26 03:26:24 +00001754 if (c->flags & CHAN_EOF_RCVD) {
1755 if (datafellows & SSH_BUG_EXTEOF)
1756 debug("channel %d: accepting ext data after eof", id);
1757 else
1758 packet_disconnect("Received extended_data after EOF "
1759 "on channel %d.", id);
1760 }
Damien Miller33b13562000-04-04 14:38:59 +10001761 tcode = packet_get_int();
1762 if (c->efd == -1 ||
1763 c->extended_usage != CHAN_EXTENDED_WRITE ||
1764 tcode != SSH2_EXTENDED_DATA_STDERR) {
1765 log("channel %d: bad ext data", c->self);
1766 return;
1767 }
1768 data = packet_get_string(&data_len);
Damien Miller48b03fc2002-01-22 23:11:40 +11001769 packet_check_eom();
Damien Miller33b13562000-04-04 14:38:59 +10001770 if (data_len > c->local_window) {
1771 log("channel %d: rcvd too much extended_data %d, win %d",
1772 c->self, data_len, c->local_window);
1773 xfree(data);
1774 return;
1775 }
Damien Millerd3444942000-09-30 14:20:03 +11001776 debug2("channel %d: rcvd ext data %d", c->self, data_len);
Damien Miller33b13562000-04-04 14:38:59 +10001777 c->local_window -= data_len;
1778 buffer_append(&c->extended, data, data_len);
1779 xfree(data);
1780}
1781
Damien Miller4af51302000-04-16 11:18:38 +10001782void
Damien Miller630d6f42002-01-22 23:17:30 +11001783channel_input_ieof(int type, u_int32_t seq, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10001784{
1785 int id;
1786 Channel *c;
1787
Damien Millerb38eff82000-04-01 11:09:21 +10001788 id = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11001789 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10001790 c = channel_lookup(id);
1791 if (c == NULL)
1792 packet_disconnect("Received ieof for nonexistent channel %d.", id);
1793 chan_rcvd_ieof(c);
Ben Lindstrom944c4f02001-09-18 05:51:13 +00001794
1795 /* XXX force input close */
Damien Millera90fc082002-01-22 23:19:38 +11001796 if (c->force_drain && c->istate == CHAN_INPUT_OPEN) {
Ben Lindstrom944c4f02001-09-18 05:51:13 +00001797 debug("channel %d: FORCE input drain", c->self);
1798 c->istate = CHAN_INPUT_WAIT_DRAIN;
Damien Miller73f10742002-01-22 23:34:52 +11001799 if (buffer_len(&c->input) == 0)
1800 chan_ibuf_empty(c);
Ben Lindstrom944c4f02001-09-18 05:51:13 +00001801 }
1802
Damien Millerb38eff82000-04-01 11:09:21 +10001803}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001804
Damien Miller4af51302000-04-16 11:18:38 +10001805void
Damien Miller630d6f42002-01-22 23:17:30 +11001806channel_input_close(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001807{
Damien Millerb38eff82000-04-01 11:09:21 +10001808 int id;
1809 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001810
Damien Millerb38eff82000-04-01 11:09:21 +10001811 id = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11001812 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10001813 c = channel_lookup(id);
1814 if (c == NULL)
1815 packet_disconnect("Received close for nonexistent channel %d.", id);
Damien Miller5428f641999-11-25 11:54:57 +11001816
1817 /*
1818 * Send a confirmation that we have closed the channel and no more
1819 * data is coming for it.
1820 */
Damien Miller95def091999-11-25 00:26:21 +11001821 packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION);
Damien Millerb38eff82000-04-01 11:09:21 +10001822 packet_put_int(c->remote_id);
Damien Miller95def091999-11-25 00:26:21 +11001823 packet_send();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001824
Damien Miller5428f641999-11-25 11:54:57 +11001825 /*
1826 * If the channel is in closed state, we have sent a close request,
1827 * and the other side will eventually respond with a confirmation.
1828 * Thus, we cannot free the channel here, because then there would be
1829 * no-one to receive the confirmation. The channel gets freed when
1830 * the confirmation arrives.
1831 */
Damien Millerb38eff82000-04-01 11:09:21 +10001832 if (c->type != SSH_CHANNEL_CLOSED) {
Damien Miller5428f641999-11-25 11:54:57 +11001833 /*
1834 * Not a closed channel - mark it as draining, which will
1835 * cause it to be freed later.
1836 */
Damien Miller76765c02002-01-22 23:21:15 +11001837 buffer_clear(&c->input);
Damien Millerb38eff82000-04-01 11:09:21 +10001838 c->type = SSH_CHANNEL_OUTPUT_DRAINING;
Damien Miller95def091999-11-25 00:26:21 +11001839 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001840}
1841
Damien Millerb38eff82000-04-01 11:09:21 +10001842/* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */
Damien Miller4af51302000-04-16 11:18:38 +10001843void
Damien Miller630d6f42002-01-22 23:17:30 +11001844channel_input_oclose(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001845{
Damien Millerb38eff82000-04-01 11:09:21 +10001846 int id = packet_get_int();
1847 Channel *c = channel_lookup(id);
Damien Miller66823cd2002-01-22 23:11:38 +11001848
Damien Miller48b03fc2002-01-22 23:11:40 +11001849 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10001850 if (c == NULL)
1851 packet_disconnect("Received oclose for nonexistent channel %d.", id);
1852 chan_rcvd_oclose(c);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001853}
1854
Damien Miller4af51302000-04-16 11:18:38 +10001855void
Damien Miller630d6f42002-01-22 23:17:30 +11001856channel_input_close_confirmation(int type, u_int32_t seq, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10001857{
1858 int id = packet_get_int();
1859 Channel *c = channel_lookup(id);
1860
Damien Miller48b03fc2002-01-22 23:11:40 +11001861 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10001862 if (c == NULL)
1863 packet_disconnect("Received close confirmation for "
1864 "out-of-range channel %d.", id);
1865 if (c->type != SSH_CHANNEL_CLOSED)
1866 packet_disconnect("Received close confirmation for "
1867 "non-closed channel %d (type %d).", id, c->type);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001868 channel_free(c);
Damien Millerb38eff82000-04-01 11:09:21 +10001869}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001870
Damien Miller4af51302000-04-16 11:18:38 +10001871void
Damien Miller630d6f42002-01-22 23:17:30 +11001872channel_input_open_confirmation(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001873{
Damien Millerb38eff82000-04-01 11:09:21 +10001874 int id, remote_id;
1875 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001876
Damien Millerb38eff82000-04-01 11:09:21 +10001877 id = packet_get_int();
1878 c = channel_lookup(id);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001879
Damien Millerb38eff82000-04-01 11:09:21 +10001880 if (c==NULL || c->type != SSH_CHANNEL_OPENING)
1881 packet_disconnect("Received open confirmation for "
1882 "non-opening channel %d.", id);
1883 remote_id = packet_get_int();
Damien Miller5428f641999-11-25 11:54:57 +11001884 /* Record the remote channel number and mark that the channel is now open. */
Damien Millerb38eff82000-04-01 11:09:21 +10001885 c->remote_id = remote_id;
1886 c->type = SSH_CHANNEL_OPEN;
Damien Miller33b13562000-04-04 14:38:59 +10001887
1888 if (compat20) {
1889 c->remote_window = packet_get_int();
1890 c->remote_maxpacket = packet_get_int();
Damien Miller67f0bc02002-02-05 12:23:08 +11001891 if (c->confirm) {
Damien Millerd3444942000-09-30 14:20:03 +11001892 debug2("callback start");
Damien Miller67f0bc02002-02-05 12:23:08 +11001893 c->confirm(c->self, NULL);
Damien Millerd3444942000-09-30 14:20:03 +11001894 debug2("callback done");
Damien Miller33b13562000-04-04 14:38:59 +10001895 }
Ben Lindstrom4fed2be2002-06-25 23:17:36 +00001896 debug("channel %d: open confirm rwindow %u rmax %u", c->self,
Damien Miller33b13562000-04-04 14:38:59 +10001897 c->remote_window, c->remote_maxpacket);
1898 }
Damien Miller48b03fc2002-01-22 23:11:40 +11001899 packet_check_eom();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001900}
1901
Ben Lindstrombba81212001-06-25 05:01:22 +00001902static char *
Ben Lindstrom69128662001-05-08 20:07:39 +00001903reason2txt(int reason)
1904{
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00001905 switch (reason) {
Ben Lindstrom69128662001-05-08 20:07:39 +00001906 case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED:
1907 return "administratively prohibited";
1908 case SSH2_OPEN_CONNECT_FAILED:
1909 return "connect failed";
1910 case SSH2_OPEN_UNKNOWN_CHANNEL_TYPE:
1911 return "unknown channel type";
1912 case SSH2_OPEN_RESOURCE_SHORTAGE:
1913 return "resource shortage";
1914 }
Ben Lindstrome2595442001-06-05 20:01:39 +00001915 return "unknown reason";
Ben Lindstrom69128662001-05-08 20:07:39 +00001916}
1917
Damien Miller4af51302000-04-16 11:18:38 +10001918void
Damien Miller630d6f42002-01-22 23:17:30 +11001919channel_input_open_failure(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001920{
Kevin Steves12057502001-02-05 14:54:34 +00001921 int id, reason;
1922 char *msg = NULL, *lang = NULL;
Damien Millerb38eff82000-04-01 11:09:21 +10001923 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001924
Damien Millerb38eff82000-04-01 11:09:21 +10001925 id = packet_get_int();
1926 c = channel_lookup(id);
1927
1928 if (c==NULL || c->type != SSH_CHANNEL_OPENING)
1929 packet_disconnect("Received open failure for "
1930 "non-opening channel %d.", id);
Damien Miller33b13562000-04-04 14:38:59 +10001931 if (compat20) {
Kevin Steves12057502001-02-05 14:54:34 +00001932 reason = packet_get_int();
Ben Lindstromf3436742001-04-29 19:52:00 +00001933 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
Kevin Steves12057502001-02-05 14:54:34 +00001934 msg = packet_get_string(NULL);
1935 lang = packet_get_string(NULL);
1936 }
Ben Lindstrom69128662001-05-08 20:07:39 +00001937 log("channel %d: open failed: %s%s%s", id,
1938 reason2txt(reason), msg ? ": ": "", msg ? msg : "");
Kevin Steves12057502001-02-05 14:54:34 +00001939 if (msg != NULL)
1940 xfree(msg);
1941 if (lang != NULL)
1942 xfree(lang);
Damien Miller33b13562000-04-04 14:38:59 +10001943 }
Damien Miller48b03fc2002-01-22 23:11:40 +11001944 packet_check_eom();
Damien Miller95def091999-11-25 00:26:21 +11001945 /* Free the channel. This will also close the socket. */
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001946 channel_free(c);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001947}
1948
Damien Miller33b13562000-04-04 14:38:59 +10001949void
Damien Miller630d6f42002-01-22 23:17:30 +11001950channel_input_window_adjust(int type, u_int32_t seq, void *ctxt)
Damien Miller33b13562000-04-04 14:38:59 +10001951{
1952 Channel *c;
Ben Lindstrom4fed2be2002-06-25 23:17:36 +00001953 int id;
1954 u_int adjust;
Damien Miller33b13562000-04-04 14:38:59 +10001955
1956 if (!compat20)
1957 return;
1958
1959 /* Get the channel number and verify it. */
1960 id = packet_get_int();
1961 c = channel_lookup(id);
1962
1963 if (c == NULL || c->type != SSH_CHANNEL_OPEN) {
1964 log("Received window adjust for "
1965 "non-open channel %d.", id);
1966 return;
1967 }
1968 adjust = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11001969 packet_check_eom();
Ben Lindstrom4fed2be2002-06-25 23:17:36 +00001970 debug2("channel %d: rcvd adjust %u", id, adjust);
Damien Miller33b13562000-04-04 14:38:59 +10001971 c->remote_window += adjust;
1972}
1973
Damien Miller4af51302000-04-16 11:18:38 +10001974void
Damien Miller630d6f42002-01-22 23:17:30 +11001975channel_input_port_open(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001976{
Ben Lindstrome9c99912001-06-09 00:41:05 +00001977 Channel *c = NULL;
1978 u_short host_port;
1979 char *host, *originator_string;
1980 int remote_id, sock = -1;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001981
Ben Lindstrome9c99912001-06-09 00:41:05 +00001982 remote_id = packet_get_int();
1983 host = packet_get_string(NULL);
1984 host_port = packet_get_int();
1985
1986 if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) {
1987 originator_string = packet_get_string(NULL);
1988 } else {
1989 originator_string = xstrdup("unknown (remote did not supply name)");
1990 }
Damien Miller48b03fc2002-01-22 23:11:40 +11001991 packet_check_eom();
Ben Lindstrome9c99912001-06-09 00:41:05 +00001992 sock = channel_connect_to(host, host_port);
1993 if (sock != -1) {
1994 c = channel_new("connected socket",
1995 SSH_CHANNEL_CONNECTING, sock, sock, -1, 0, 0, 0,
1996 originator_string, 1);
Damien Miller699d0032002-02-08 22:07:16 +11001997 c->remote_id = remote_id;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001998 }
Ben Lindstrome9c99912001-06-09 00:41:05 +00001999 if (c == NULL) {
2000 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
2001 packet_put_int(remote_id);
2002 packet_send();
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002003 }
Ben Lindstrome9c99912001-06-09 00:41:05 +00002004 xfree(host);
Ben Lindstrom5744dc42001-04-13 23:28:01 +00002005}
2006
2007
Ben Lindstrome9c99912001-06-09 00:41:05 +00002008/* -- tcp forwarding */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002009
Ben Lindstrom908afed2001-10-03 17:34:59 +00002010void
2011channel_set_af(int af)
2012{
2013 IPv4or6 = af;
2014}
2015
Damien Millerb16461c2002-01-22 23:29:22 +11002016static int
2017channel_setup_fwd_listener(int type, const char *listen_addr, u_short listen_port,
2018 const char *host_to_connect, u_short port_to_connect, int gateway_ports)
Damien Miller0bc1bd82000-11-13 22:57:25 +11002019{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002020 Channel *c;
Damien Millerb16461c2002-01-22 23:29:22 +11002021 int success, sock, on = 1;
Damien Miller34132e52000-01-14 15:45:46 +11002022 struct addrinfo hints, *ai, *aitop;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002023 const char *host;
Damien Millerb16461c2002-01-22 23:29:22 +11002024 char ntop[NI_MAXHOST], strport[NI_MAXSERV];
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002025
Kevin Steves12057502001-02-05 14:54:34 +00002026 success = 0;
Damien Millerb16461c2002-01-22 23:29:22 +11002027 host = (type == SSH_CHANNEL_RPORT_LISTENER) ?
2028 listen_addr : host_to_connect;
Kevin Steves12057502001-02-05 14:54:34 +00002029
Damien Millerb16461c2002-01-22 23:29:22 +11002030 if (host == NULL) {
2031 error("No forward host name.");
2032 return success;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002033 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002034 if (strlen(host) > SSH_CHANNEL_PATH_LEN - 1) {
Kevin Steves12057502001-02-05 14:54:34 +00002035 error("Forward host name too long.");
2036 return success;
2037 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002038
Damien Miller5428f641999-11-25 11:54:57 +11002039 /*
Damien Miller34132e52000-01-14 15:45:46 +11002040 * getaddrinfo returns a loopback address if the hostname is
2041 * set to NULL and hints.ai_flags is not AI_PASSIVE
Damien Miller5428f641999-11-25 11:54:57 +11002042 */
Damien Miller34132e52000-01-14 15:45:46 +11002043 memset(&hints, 0, sizeof(hints));
2044 hints.ai_family = IPv4or6;
2045 hints.ai_flags = gateway_ports ? AI_PASSIVE : 0;
2046 hints.ai_socktype = SOCK_STREAM;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002047 snprintf(strport, sizeof strport, "%d", listen_port);
Damien Miller34132e52000-01-14 15:45:46 +11002048 if (getaddrinfo(NULL, strport, &hints, &aitop) != 0)
2049 packet_disconnect("getaddrinfo: fatal error");
Damien Miller5428f641999-11-25 11:54:57 +11002050
Damien Miller34132e52000-01-14 15:45:46 +11002051 for (ai = aitop; ai; ai = ai->ai_next) {
2052 if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
2053 continue;
2054 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop),
2055 strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
Damien Millerb16461c2002-01-22 23:29:22 +11002056 error("channel_setup_fwd_listener: getnameinfo failed");
Damien Miller34132e52000-01-14 15:45:46 +11002057 continue;
2058 }
2059 /* Create a port to listen for the host. */
2060 sock = socket(ai->ai_family, SOCK_STREAM, 0);
2061 if (sock < 0) {
2062 /* this is no error since kernel may not support ipv6 */
2063 verbose("socket: %.100s", strerror(errno));
2064 continue;
2065 }
2066 /*
Damien Millere1383ce2002-09-19 11:49:37 +10002067 * Set socket options.
2068 * Allow local port reuse in TIME_WAIT.
Damien Miller34132e52000-01-14 15:45:46 +11002069 */
Damien Millere1383ce2002-09-19 11:49:37 +10002070 if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &on,
2071 sizeof(on)) == -1)
2072 error("setsockopt SO_REUSEADDR: %s", strerror(errno));
2073
Damien Miller34132e52000-01-14 15:45:46 +11002074 debug("Local forwarding listening on %s port %s.", ntop, strport);
Damien Miller95def091999-11-25 00:26:21 +11002075
Damien Miller34132e52000-01-14 15:45:46 +11002076 /* Bind the socket to the address. */
2077 if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
2078 /* address can be in use ipv6 address is already bound */
Damien Miller3c7eeb22000-03-03 22:35:33 +11002079 if (!ai->ai_next)
2080 error("bind: %.100s", strerror(errno));
2081 else
2082 verbose("bind: %.100s", strerror(errno));
Kevin Stevesef4eea92001-02-05 12:42:17 +00002083
Damien Miller34132e52000-01-14 15:45:46 +11002084 close(sock);
2085 continue;
2086 }
2087 /* Start listening for connections on the socket. */
2088 if (listen(sock, 5) < 0) {
2089 error("listen: %.100s", strerror(errno));
2090 close(sock);
2091 continue;
2092 }
2093 /* Allocate a channel number for the socket. */
Ben Lindstrome9c99912001-06-09 00:41:05 +00002094 c = channel_new("port listener", type, sock, sock, -1,
Damien Millerbd483e72000-04-30 10:00:53 +10002095 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
Damien Miller69b69aa2000-10-28 14:19:58 +11002096 0, xstrdup("port listener"), 1);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002097 strlcpy(c->path, host, sizeof(c->path));
2098 c->host_port = port_to_connect;
2099 c->listening_port = listen_port;
Damien Miller34132e52000-01-14 15:45:46 +11002100 success = 1;
2101 }
2102 if (success == 0)
Damien Millerb16461c2002-01-22 23:29:22 +11002103 error("channel_setup_fwd_listener: cannot listen to port: %d",
Kevin Steves12057502001-02-05 14:54:34 +00002104 listen_port);
Damien Miller34132e52000-01-14 15:45:46 +11002105 freeaddrinfo(aitop);
Kevin Steves12057502001-02-05 14:54:34 +00002106 return success;
Damien Miller95def091999-11-25 00:26:21 +11002107}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002108
Damien Millerb16461c2002-01-22 23:29:22 +11002109/* protocol local port fwd, used by ssh (and sshd in v1) */
2110int
2111channel_setup_local_fwd_listener(u_short listen_port,
2112 const char *host_to_connect, u_short port_to_connect, int gateway_ports)
2113{
2114 return channel_setup_fwd_listener(SSH_CHANNEL_PORT_LISTENER,
2115 NULL, listen_port, host_to_connect, port_to_connect, gateway_ports);
2116}
2117
2118/* protocol v2 remote port fwd, used by sshd */
2119int
2120channel_setup_remote_fwd_listener(const char *listen_address,
2121 u_short listen_port, int gateway_ports)
2122{
2123 return channel_setup_fwd_listener(SSH_CHANNEL_RPORT_LISTENER,
2124 listen_address, listen_port, NULL, 0, gateway_ports);
2125}
2126
Damien Miller5428f641999-11-25 11:54:57 +11002127/*
2128 * Initiate forwarding of connections to port "port" on remote host through
2129 * the secure channel to host:port from local side.
2130 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002131
Damien Miller4af51302000-04-16 11:18:38 +10002132void
Damien Miller0bc1bd82000-11-13 22:57:25 +11002133channel_request_remote_forwarding(u_short listen_port,
2134 const char *host_to_connect, u_short port_to_connect)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002135{
Damien Millerdff50992002-01-22 23:16:32 +11002136 int type, success = 0;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002137
Damien Miller95def091999-11-25 00:26:21 +11002138 /* Record locally that connection to this host/port is permitted. */
2139 if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION)
2140 fatal("channel_request_remote_forwarding: too many forwards");
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002141
Damien Miller95def091999-11-25 00:26:21 +11002142 /* Send the forward request to the remote side. */
Damien Miller33b13562000-04-04 14:38:59 +10002143 if (compat20) {
2144 const char *address_to_bind = "0.0.0.0";
2145 packet_start(SSH2_MSG_GLOBAL_REQUEST);
2146 packet_put_cstring("tcpip-forward");
Damien Miller2797f7f2002-04-23 21:09:44 +10002147 packet_put_char(1); /* boolean: want reply */
Damien Miller33b13562000-04-04 14:38:59 +10002148 packet_put_cstring(address_to_bind);
2149 packet_put_int(listen_port);
Damien Miller0bc1bd82000-11-13 22:57:25 +11002150 packet_send();
2151 packet_write_wait();
2152 /* Assume that server accepts the request */
2153 success = 1;
Damien Miller33b13562000-04-04 14:38:59 +10002154 } else {
2155 packet_start(SSH_CMSG_PORT_FORWARD_REQUEST);
Damien Miller33b13562000-04-04 14:38:59 +10002156 packet_put_int(listen_port);
Damien Miller8bb73be2000-04-19 16:26:12 +10002157 packet_put_cstring(host_to_connect);
2158 packet_put_int(port_to_connect);
Damien Miller33b13562000-04-04 14:38:59 +10002159 packet_send();
2160 packet_write_wait();
Damien Miller0bc1bd82000-11-13 22:57:25 +11002161
2162 /* Wait for response from the remote side. */
Damien Millerdff50992002-01-22 23:16:32 +11002163 type = packet_read();
Damien Miller0bc1bd82000-11-13 22:57:25 +11002164 switch (type) {
2165 case SSH_SMSG_SUCCESS:
2166 success = 1;
2167 break;
2168 case SSH_SMSG_FAILURE:
2169 log("Warning: Server denied remote port forwarding.");
2170 break;
2171 default:
2172 /* Unknown packet */
2173 packet_disconnect("Protocol error for port forward request:"
2174 "received packet type %d.", type);
2175 }
2176 }
2177 if (success) {
2178 permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host_to_connect);
2179 permitted_opens[num_permitted_opens].port_to_connect = port_to_connect;
2180 permitted_opens[num_permitted_opens].listen_port = listen_port;
2181 num_permitted_opens++;
Damien Miller33b13562000-04-04 14:38:59 +10002182 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002183}
2184
Damien Miller5428f641999-11-25 11:54:57 +11002185/*
2186 * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates
2187 * listening for the port, and sends back a success reply (or disconnect
2188 * message if there was an error). This never returns if there was an error.
2189 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002190
Damien Miller4af51302000-04-16 11:18:38 +10002191void
Damien Millere247cc42000-05-07 12:03:14 +10002192channel_input_port_forward_request(int is_root, int gateway_ports)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002193{
Damien Milleraae6c611999-12-06 11:47:28 +11002194 u_short port, host_port;
Damien Miller95def091999-11-25 00:26:21 +11002195 char *hostname;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002196
Damien Miller95def091999-11-25 00:26:21 +11002197 /* Get arguments from the packet. */
2198 port = packet_get_int();
2199 hostname = packet_get_string(NULL);
2200 host_port = packet_get_int();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002201
Damien Millerbac2d8a2000-09-05 16:13:06 +11002202#ifndef HAVE_CYGWIN
Damien Miller5428f641999-11-25 11:54:57 +11002203 /*
2204 * Check that an unprivileged user is not trying to forward a
2205 * privileged port.
2206 */
Damien Miller95def091999-11-25 00:26:21 +11002207 if (port < IPPORT_RESERVED && !is_root)
2208 packet_disconnect("Requested forwarding of port %d but user is not root.",
2209 port);
Damien Millerbac2d8a2000-09-05 16:13:06 +11002210#endif
Damien Miller0bc1bd82000-11-13 22:57:25 +11002211 /* Initiate forwarding */
Damien Millerb16461c2002-01-22 23:29:22 +11002212 channel_setup_local_fwd_listener(port, hostname, host_port, gateway_ports);
Damien Miller95def091999-11-25 00:26:21 +11002213
2214 /* Free the argument string. */
2215 xfree(hostname);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002216}
2217
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002218/*
2219 * Permits opening to any host/port if permitted_opens[] is empty. This is
2220 * usually called by the server, because the user could connect to any port
2221 * anyway, and the server has no way to know but to trust the client anyway.
2222 */
2223void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00002224channel_permit_all_opens(void)
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002225{
2226 if (num_permitted_opens == 0)
2227 all_opens_permitted = 1;
2228}
2229
Ben Lindstroma3700052001-04-05 23:26:32 +00002230void
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002231channel_add_permitted_opens(char *host, int port)
2232{
2233 if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION)
2234 fatal("channel_request_remote_forwarding: too many forwards");
2235 debug("allow port forwarding to host %s port %d", host, port);
2236
2237 permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host);
2238 permitted_opens[num_permitted_opens].port_to_connect = port;
2239 num_permitted_opens++;
2240
2241 all_opens_permitted = 0;
2242}
2243
Ben Lindstroma3700052001-04-05 23:26:32 +00002244void
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002245channel_clear_permitted_opens(void)
2246{
2247 int i;
2248
2249 for (i = 0; i < num_permitted_opens; i++)
2250 xfree(permitted_opens[i].host_to_connect);
2251 num_permitted_opens = 0;
2252
2253}
2254
2255
2256/* return socket to remote host, port */
Ben Lindstrombba81212001-06-25 05:01:22 +00002257static int
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002258connect_to(const char *host, u_short port)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002259{
Damien Miller34132e52000-01-14 15:45:46 +11002260 struct addrinfo hints, *ai, *aitop;
2261 char ntop[NI_MAXHOST], strport[NI_MAXSERV];
2262 int gaierr;
Damien Millerb38eff82000-04-01 11:09:21 +10002263 int sock = -1;
Damien Miller95def091999-11-25 00:26:21 +11002264
Damien Miller34132e52000-01-14 15:45:46 +11002265 memset(&hints, 0, sizeof(hints));
2266 hints.ai_family = IPv4or6;
2267 hints.ai_socktype = SOCK_STREAM;
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002268 snprintf(strport, sizeof strport, "%d", port);
Damien Miller34132e52000-01-14 15:45:46 +11002269 if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) {
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002270 error("connect_to %.100s: unknown host (%s)", host,
2271 gai_strerror(gaierr));
Damien Millerb38eff82000-04-01 11:09:21 +10002272 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002273 }
Damien Miller34132e52000-01-14 15:45:46 +11002274 for (ai = aitop; ai; ai = ai->ai_next) {
2275 if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
2276 continue;
2277 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop),
2278 strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002279 error("connect_to: getnameinfo failed");
Damien Miller34132e52000-01-14 15:45:46 +11002280 continue;
2281 }
Damien Miller34132e52000-01-14 15:45:46 +11002282 sock = socket(ai->ai_family, SOCK_STREAM, 0);
2283 if (sock < 0) {
2284 error("socket: %.100s", strerror(errno));
2285 continue;
2286 }
Ben Lindstrom48bd7c12001-01-09 00:35:42 +00002287 if (fcntl(sock, F_SETFL, O_NONBLOCK) < 0)
Ben Lindstrom7ad97102000-12-06 01:42:49 +00002288 fatal("connect_to: F_SETFL: %s", strerror(errno));
Ben Lindstrom7ad97102000-12-06 01:42:49 +00002289 if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0 &&
2290 errno != EINPROGRESS) {
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002291 error("connect_to %.100s port %s: %.100s", ntop, strport,
Damien Miller34132e52000-01-14 15:45:46 +11002292 strerror(errno));
2293 close(sock);
Kevin Stevesef4eea92001-02-05 12:42:17 +00002294 continue; /* fail -- try next */
Damien Miller34132e52000-01-14 15:45:46 +11002295 }
2296 break; /* success */
2297
2298 }
2299 freeaddrinfo(aitop);
Damien Miller34132e52000-01-14 15:45:46 +11002300 if (!ai) {
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002301 error("connect_to %.100s port %d: failed.", host, port);
Damien Millerb38eff82000-04-01 11:09:21 +10002302 return -1;
2303 }
2304 /* success */
Ben Lindstrom1ebd7a52002-02-26 18:12:51 +00002305 set_nodelay(sock);
Damien Millerb38eff82000-04-01 11:09:21 +10002306 return sock;
2307}
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002308
Damien Miller0bc1bd82000-11-13 22:57:25 +11002309int
Ben Lindstrom173e6462001-07-04 05:15:15 +00002310channel_connect_by_listen_address(u_short listen_port)
Damien Miller0bc1bd82000-11-13 22:57:25 +11002311{
2312 int i;
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002313
Damien Miller0bc1bd82000-11-13 22:57:25 +11002314 for (i = 0; i < num_permitted_opens; i++)
2315 if (permitted_opens[i].listen_port == listen_port)
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002316 return connect_to(
Damien Miller0bc1bd82000-11-13 22:57:25 +11002317 permitted_opens[i].host_to_connect,
2318 permitted_opens[i].port_to_connect);
Ben Lindstromc72745a2000-12-02 19:03:54 +00002319 error("WARNING: Server requests forwarding for unknown listen_port %d",
2320 listen_port);
Damien Miller0bc1bd82000-11-13 22:57:25 +11002321 return -1;
2322}
Damien Millerb38eff82000-04-01 11:09:21 +10002323
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002324/* Check if connecting to that port is permitted and connect. */
2325int
2326channel_connect_to(const char *host, u_short port)
2327{
2328 int i, permit;
2329
2330 permit = all_opens_permitted;
2331 if (!permit) {
2332 for (i = 0; i < num_permitted_opens; i++)
2333 if (permitted_opens[i].port_to_connect == port &&
2334 strcmp(permitted_opens[i].host_to_connect, host) == 0)
2335 permit = 1;
2336
2337 }
2338 if (!permit) {
2339 log("Received request to connect to host %.100s port %d, "
2340 "but the request was denied.", host, port);
2341 return -1;
2342 }
2343 return connect_to(host, port);
2344}
2345
Ben Lindstrome9c99912001-06-09 00:41:05 +00002346/* -- X11 forwarding */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002347
Damien Miller5428f641999-11-25 11:54:57 +11002348/*
2349 * Creates an internet domain socket for listening for X11 connections.
Ben Lindstroma9d2c892002-06-23 21:48:28 +00002350 * Returns 0 and a suitable display number for the DISPLAY variable
2351 * stored in display_numberp , or -1 if an error occurs.
Damien Miller5428f641999-11-25 11:54:57 +11002352 */
Kevin Steves366298c2001-12-19 17:58:01 +00002353int
Damien Miller95c249f2002-02-05 12:11:34 +11002354x11_create_display_inet(int x11_display_offset, int x11_use_localhost,
Ben Lindstroma9d2c892002-06-23 21:48:28 +00002355 int single_connection, u_int *display_numberp)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002356{
Damien Millere7378562001-12-21 14:58:35 +11002357 Channel *nc = NULL;
Damien Milleraae6c611999-12-06 11:47:28 +11002358 int display_number, sock;
2359 u_short port;
Damien Miller34132e52000-01-14 15:45:46 +11002360 struct addrinfo hints, *ai, *aitop;
2361 char strport[NI_MAXSERV];
2362 int gaierr, n, num_socks = 0, socks[NUM_SOCKS];
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002363
Damien Millera34a28b1999-12-14 10:47:15 +11002364 for (display_number = x11_display_offset;
Damien Miller9f0f5c62001-12-21 14:45:46 +11002365 display_number < MAX_DISPLAYS;
2366 display_number++) {
Damien Miller95def091999-11-25 00:26:21 +11002367 port = 6000 + display_number;
Damien Miller34132e52000-01-14 15:45:46 +11002368 memset(&hints, 0, sizeof(hints));
2369 hints.ai_family = IPv4or6;
Damien Miller95c249f2002-02-05 12:11:34 +11002370 hints.ai_flags = x11_use_localhost ? 0: AI_PASSIVE;
Damien Miller34132e52000-01-14 15:45:46 +11002371 hints.ai_socktype = SOCK_STREAM;
2372 snprintf(strport, sizeof strport, "%d", port);
2373 if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) {
2374 error("getaddrinfo: %.100s", gai_strerror(gaierr));
Kevin Steves366298c2001-12-19 17:58:01 +00002375 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002376 }
Damien Miller34132e52000-01-14 15:45:46 +11002377 for (ai = aitop; ai; ai = ai->ai_next) {
2378 if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
2379 continue;
2380 sock = socket(ai->ai_family, SOCK_STREAM, 0);
2381 if (sock < 0) {
Damien Miller89d97962000-10-14 12:37:19 +11002382 if ((errno != EINVAL) && (errno != EAFNOSUPPORT)) {
Damien Millere2192732000-01-17 13:22:55 +11002383 error("socket: %.100s", strerror(errno));
Kevin Steves366298c2001-12-19 17:58:01 +00002384 return -1;
Damien Millere2192732000-01-17 13:22:55 +11002385 } else {
Damien Millercb5e44a2000-09-29 12:12:36 +11002386 debug("x11_create_display_inet: Socket family %d not supported",
2387 ai->ai_family);
Damien Millere2192732000-01-17 13:22:55 +11002388 continue;
2389 }
Damien Miller34132e52000-01-14 15:45:46 +11002390 }
Kevin Stevesdf75dd22002-06-04 20:52:19 +00002391#ifdef IPV6_V6ONLY
2392 if (ai->ai_family == AF_INET6) {
2393 int on = 1;
2394 if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) < 0)
2395 error("setsockopt IPV6_V6ONLY: %.100s", strerror(errno));
2396 }
2397#endif
Damien Miller34132e52000-01-14 15:45:46 +11002398 if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
2399 debug("bind port %d: %.100s", port, strerror(errno));
Damien Miller34132e52000-01-14 15:45:46 +11002400 close(sock);
Damien Miller3c7eeb22000-03-03 22:35:33 +11002401
2402 if (ai->ai_next)
2403 continue;
2404
Damien Miller34132e52000-01-14 15:45:46 +11002405 for (n = 0; n < num_socks; n++) {
Damien Miller34132e52000-01-14 15:45:46 +11002406 close(socks[n]);
2407 }
2408 num_socks = 0;
2409 break;
2410 }
2411 socks[num_socks++] = sock;
Damien Miller7bcb0892000-03-11 20:45:40 +11002412#ifndef DONT_TRY_OTHER_AF
Damien Miller34132e52000-01-14 15:45:46 +11002413 if (num_socks == NUM_SOCKS)
2414 break;
Damien Miller7bcb0892000-03-11 20:45:40 +11002415#else
Kevin Stevesdf75dd22002-06-04 20:52:19 +00002416 if (x11_use_localhost) {
2417 if (num_socks == NUM_SOCKS)
2418 break;
2419 } else {
2420 break;
2421 }
Damien Miller7bcb0892000-03-11 20:45:40 +11002422#endif
Damien Miller95def091999-11-25 00:26:21 +11002423 }
Ben Lindstrom87b147f2001-01-25 00:41:12 +00002424 freeaddrinfo(aitop);
Damien Miller34132e52000-01-14 15:45:46 +11002425 if (num_socks > 0)
2426 break;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002427 }
Damien Miller95def091999-11-25 00:26:21 +11002428 if (display_number >= MAX_DISPLAYS) {
2429 error("Failed to allocate internet-domain X11 display socket.");
Kevin Steves366298c2001-12-19 17:58:01 +00002430 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002431 }
Damien Miller95def091999-11-25 00:26:21 +11002432 /* Start listening for connections on the socket. */
Damien Miller34132e52000-01-14 15:45:46 +11002433 for (n = 0; n < num_socks; n++) {
2434 sock = socks[n];
2435 if (listen(sock, 5) < 0) {
2436 error("listen: %.100s", strerror(errno));
Damien Miller34132e52000-01-14 15:45:46 +11002437 close(sock);
Kevin Steves366298c2001-12-19 17:58:01 +00002438 return -1;
Damien Miller34132e52000-01-14 15:45:46 +11002439 }
Damien Miller95def091999-11-25 00:26:21 +11002440 }
Damien Miller34132e52000-01-14 15:45:46 +11002441
Damien Miller34132e52000-01-14 15:45:46 +11002442 /* Allocate a channel for each socket. */
2443 for (n = 0; n < num_socks; n++) {
2444 sock = socks[n];
Damien Millere7378562001-12-21 14:58:35 +11002445 nc = channel_new("x11 listener",
Damien Millerbd483e72000-04-30 10:00:53 +10002446 SSH_CHANNEL_X11_LISTENER, sock, sock, -1,
2447 CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
Damien Miller69b69aa2000-10-28 14:19:58 +11002448 0, xstrdup("X11 inet listener"), 1);
Damien Miller699d0032002-02-08 22:07:16 +11002449 nc->single_connection = single_connection;
Damien Miller34132e52000-01-14 15:45:46 +11002450 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002451
Kevin Steves366298c2001-12-19 17:58:01 +00002452 /* Return the display number for the DISPLAY environment variable. */
Ben Lindstroma9d2c892002-06-23 21:48:28 +00002453 *display_numberp = display_number;
2454 return (0);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002455}
2456
Ben Lindstrombba81212001-06-25 05:01:22 +00002457static int
Ben Lindstrom46c16222000-12-22 01:43:59 +00002458connect_local_xsocket(u_int dnr)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002459{
Damien Miller95def091999-11-25 00:26:21 +11002460 int sock;
2461 struct sockaddr_un addr;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002462
Damien Miller3afe3752001-12-21 12:39:51 +11002463 sock = socket(AF_UNIX, SOCK_STREAM, 0);
2464 if (sock < 0)
2465 error("socket: %.100s", strerror(errno));
2466 memset(&addr, 0, sizeof(addr));
2467 addr.sun_family = AF_UNIX;
2468 snprintf(addr.sun_path, sizeof addr.sun_path, _PATH_UNIX_X, dnr);
2469 if (connect(sock, (struct sockaddr *) & addr, sizeof(addr)) == 0)
2470 return sock;
2471 close(sock);
Damien Miller95def091999-11-25 00:26:21 +11002472 error("connect %.100s: %.100s", addr.sun_path, strerror(errno));
2473 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002474}
2475
Damien Millerbd483e72000-04-30 10:00:53 +10002476int
2477x11_connect_display(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002478{
Damien Miller398e1cf2002-02-05 11:52:13 +11002479 int display_number, sock = 0;
Damien Miller95def091999-11-25 00:26:21 +11002480 const char *display;
Damien Millerbd483e72000-04-30 10:00:53 +10002481 char buf[1024], *cp;
Damien Miller34132e52000-01-14 15:45:46 +11002482 struct addrinfo hints, *ai, *aitop;
2483 char strport[NI_MAXSERV];
2484 int gaierr;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002485
Damien Miller95def091999-11-25 00:26:21 +11002486 /* Try to open a socket for the local X server. */
2487 display = getenv("DISPLAY");
2488 if (!display) {
2489 error("DISPLAY not set.");
Damien Millerbd483e72000-04-30 10:00:53 +10002490 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002491 }
Damien Miller5428f641999-11-25 11:54:57 +11002492 /*
2493 * Now we decode the value of the DISPLAY variable and make a
2494 * connection to the real X server.
2495 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002496
Damien Miller5428f641999-11-25 11:54:57 +11002497 /*
2498 * Check if it is a unix domain socket. Unix domain displays are in
2499 * one of the following formats: unix:d[.s], :d[.s], ::d[.s]
2500 */
Damien Miller95def091999-11-25 00:26:21 +11002501 if (strncmp(display, "unix:", 5) == 0 ||
2502 display[0] == ':') {
2503 /* Connect to the unix domain socket. */
2504 if (sscanf(strrchr(display, ':') + 1, "%d", &display_number) != 1) {
2505 error("Could not parse display number from DISPLAY: %.100s",
Damien Miller9f0f5c62001-12-21 14:45:46 +11002506 display);
Damien Millerbd483e72000-04-30 10:00:53 +10002507 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002508 }
2509 /* Create a socket. */
2510 sock = connect_local_xsocket(display_number);
2511 if (sock < 0)
Damien Millerbd483e72000-04-30 10:00:53 +10002512 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002513
2514 /* OK, we now have a connection to the display. */
Damien Millerbd483e72000-04-30 10:00:53 +10002515 return sock;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002516 }
Damien Miller5428f641999-11-25 11:54:57 +11002517 /*
2518 * Connect to an inet socket. The DISPLAY value is supposedly
2519 * hostname:d[.s], where hostname may also be numeric IP address.
2520 */
Ben Lindstromccd8d072001-12-07 17:26:48 +00002521 strlcpy(buf, display, sizeof(buf));
Damien Miller95def091999-11-25 00:26:21 +11002522 cp = strchr(buf, ':');
2523 if (!cp) {
2524 error("Could not find ':' in DISPLAY: %.100s", display);
Damien Millerbd483e72000-04-30 10:00:53 +10002525 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002526 }
Damien Miller95def091999-11-25 00:26:21 +11002527 *cp = 0;
Damien Miller5428f641999-11-25 11:54:57 +11002528 /* buf now contains the host name. But first we parse the display number. */
Damien Miller95def091999-11-25 00:26:21 +11002529 if (sscanf(cp + 1, "%d", &display_number) != 1) {
2530 error("Could not parse display number from DISPLAY: %.100s",
Damien Miller9f0f5c62001-12-21 14:45:46 +11002531 display);
Damien Millerbd483e72000-04-30 10:00:53 +10002532 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002533 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002534
Damien Miller34132e52000-01-14 15:45:46 +11002535 /* Look up the host address */
2536 memset(&hints, 0, sizeof(hints));
2537 hints.ai_family = IPv4or6;
2538 hints.ai_socktype = SOCK_STREAM;
2539 snprintf(strport, sizeof strport, "%d", 6000 + display_number);
2540 if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) {
2541 error("%.100s: unknown host. (%s)", buf, gai_strerror(gaierr));
Damien Millerbd483e72000-04-30 10:00:53 +10002542 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002543 }
Damien Miller34132e52000-01-14 15:45:46 +11002544 for (ai = aitop; ai; ai = ai->ai_next) {
2545 /* Create a socket. */
2546 sock = socket(ai->ai_family, SOCK_STREAM, 0);
2547 if (sock < 0) {
2548 debug("socket: %.100s", strerror(errno));
Damien Millerb38eff82000-04-01 11:09:21 +10002549 continue;
2550 }
2551 /* Connect it to the display. */
2552 if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
2553 debug("connect %.100s port %d: %.100s", buf,
2554 6000 + display_number, strerror(errno));
2555 close(sock);
2556 continue;
2557 }
2558 /* Success */
2559 break;
Damien Miller34132e52000-01-14 15:45:46 +11002560 }
Damien Miller34132e52000-01-14 15:45:46 +11002561 freeaddrinfo(aitop);
2562 if (!ai) {
Damien Miller4af51302000-04-16 11:18:38 +10002563 error("connect %.100s port %d: %.100s", buf, 6000 + display_number,
Damien Miller34132e52000-01-14 15:45:46 +11002564 strerror(errno));
Damien Millerbd483e72000-04-30 10:00:53 +10002565 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002566 }
Damien Miller398e1cf2002-02-05 11:52:13 +11002567 set_nodelay(sock);
Damien Millerbd483e72000-04-30 10:00:53 +10002568 return sock;
2569}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002570
Damien Millerbd483e72000-04-30 10:00:53 +10002571/*
2572 * This is called when SSH_SMSG_X11_OPEN is received. The packet contains
2573 * the remote channel number. We should do whatever we want, and respond
2574 * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE.
2575 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002576
Damien Millerbd483e72000-04-30 10:00:53 +10002577void
Damien Miller630d6f42002-01-22 23:17:30 +11002578x11_input_open(int type, u_int32_t seq, void *ctxt)
Damien Millerbd483e72000-04-30 10:00:53 +10002579{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002580 Channel *c = NULL;
2581 int remote_id, sock = 0;
Damien Millerbd483e72000-04-30 10:00:53 +10002582 char *remote_host;
Damien Millerbd483e72000-04-30 10:00:53 +10002583
2584 debug("Received X11 open request.");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002585
2586 remote_id = packet_get_int();
Ben Lindstrome9c99912001-06-09 00:41:05 +00002587
2588 if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002589 remote_host = packet_get_string(NULL);
2590 } else {
2591 remote_host = xstrdup("unknown (remote did not supply name)");
2592 }
Damien Miller48b03fc2002-01-22 23:11:40 +11002593 packet_check_eom();
Damien Millerbd483e72000-04-30 10:00:53 +10002594
2595 /* Obtain a connection to the real X display. */
2596 sock = x11_connect_display();
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002597 if (sock != -1) {
2598 /* Allocate a channel for this connection. */
2599 c = channel_new("connected x11 socket",
2600 SSH_CHANNEL_X11_OPEN, sock, sock, -1, 0, 0, 0,
2601 remote_host, 1);
Damien Miller699d0032002-02-08 22:07:16 +11002602 c->remote_id = remote_id;
2603 c->force_drain = 1;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002604 }
2605 if (c == NULL) {
Damien Millerbd483e72000-04-30 10:00:53 +10002606 /* Send refusal to the remote host. */
2607 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002608 packet_put_int(remote_id);
Damien Millerbd483e72000-04-30 10:00:53 +10002609 } else {
Damien Millerbd483e72000-04-30 10:00:53 +10002610 /* Send a confirmation to the remote host. */
2611 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002612 packet_put_int(remote_id);
2613 packet_put_int(c->self);
Damien Millerbd483e72000-04-30 10:00:53 +10002614 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002615 packet_send();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002616}
2617
Damien Miller69b69aa2000-10-28 14:19:58 +11002618/* dummy protocol handler that denies SSH-1 requests (agent/x11) */
2619void
Damien Miller630d6f42002-01-22 23:17:30 +11002620deny_input_open(int type, u_int32_t seq, void *ctxt)
Damien Miller69b69aa2000-10-28 14:19:58 +11002621{
2622 int rchan = packet_get_int();
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +00002623
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00002624 switch (type) {
Damien Miller69b69aa2000-10-28 14:19:58 +11002625 case SSH_SMSG_AGENT_OPEN:
2626 error("Warning: ssh server tried agent forwarding.");
2627 break;
2628 case SSH_SMSG_X11_OPEN:
2629 error("Warning: ssh server tried X11 forwarding.");
2630 break;
2631 default:
Damien Miller630d6f42002-01-22 23:17:30 +11002632 error("deny_input_open: type %d", type);
Damien Miller69b69aa2000-10-28 14:19:58 +11002633 break;
2634 }
2635 error("Warning: this is probably a break in attempt by a malicious server.");
2636 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
2637 packet_put_int(rchan);
2638 packet_send();
2639}
2640
Damien Miller5428f641999-11-25 11:54:57 +11002641/*
2642 * Requests forwarding of X11 connections, generates fake authentication
2643 * data, and enables authentication spoofing.
Ben Lindstrome9c99912001-06-09 00:41:05 +00002644 * This should be called in the client only.
Damien Miller5428f641999-11-25 11:54:57 +11002645 */
Damien Miller4af51302000-04-16 11:18:38 +10002646void
Damien Millerbd483e72000-04-30 10:00:53 +10002647x11_request_forwarding_with_spoofing(int client_session_id,
2648 const char *proto, const char *data)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002649{
Ben Lindstrom46c16222000-12-22 01:43:59 +00002650 u_int data_len = (u_int) strlen(data) / 2;
Ben Lindstromb3211a82001-02-10 22:33:19 +00002651 u_int i, value, len;
Damien Miller95def091999-11-25 00:26:21 +11002652 char *new_data;
2653 int screen_number;
2654 const char *cp;
2655 u_int32_t rand = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002656
Damien Miller95def091999-11-25 00:26:21 +11002657 cp = getenv("DISPLAY");
2658 if (cp)
2659 cp = strchr(cp, ':');
2660 if (cp)
2661 cp = strchr(cp, '.');
2662 if (cp)
2663 screen_number = atoi(cp + 1);
2664 else
2665 screen_number = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002666
Damien Miller95def091999-11-25 00:26:21 +11002667 /* Save protocol name. */
2668 x11_saved_proto = xstrdup(proto);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002669
Damien Miller5428f641999-11-25 11:54:57 +11002670 /*
2671 * Extract real authentication data and generate fake data of the
2672 * same length.
2673 */
Damien Miller95def091999-11-25 00:26:21 +11002674 x11_saved_data = xmalloc(data_len);
2675 x11_fake_data = xmalloc(data_len);
2676 for (i = 0; i < data_len; i++) {
2677 if (sscanf(data + 2 * i, "%2x", &value) != 1)
2678 fatal("x11_request_forwarding: bad authentication data: %.100s", data);
2679 if (i % 4 == 0)
2680 rand = arc4random();
2681 x11_saved_data[i] = value;
2682 x11_fake_data[i] = rand & 0xff;
2683 rand >>= 8;
2684 }
2685 x11_saved_data_len = data_len;
2686 x11_fake_data_len = data_len;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002687
Damien Miller95def091999-11-25 00:26:21 +11002688 /* Convert the fake data into hex. */
Ben Lindstromb3211a82001-02-10 22:33:19 +00002689 len = 2 * data_len + 1;
2690 new_data = xmalloc(len);
Damien Miller95def091999-11-25 00:26:21 +11002691 for (i = 0; i < data_len; i++)
Ben Lindstromb3211a82001-02-10 22:33:19 +00002692 snprintf(new_data + 2 * i, len - 2 * i,
2693 "%02x", (u_char) x11_fake_data[i]);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002694
Damien Miller95def091999-11-25 00:26:21 +11002695 /* Send the request packet. */
Damien Millerbd483e72000-04-30 10:00:53 +10002696 if (compat20) {
2697 channel_request_start(client_session_id, "x11-req", 0);
2698 packet_put_char(0); /* XXX bool single connection */
2699 } else {
2700 packet_start(SSH_CMSG_X11_REQUEST_FORWARDING);
2701 }
2702 packet_put_cstring(proto);
2703 packet_put_cstring(new_data);
Damien Miller95def091999-11-25 00:26:21 +11002704 packet_put_int(screen_number);
2705 packet_send();
2706 packet_write_wait();
2707 xfree(new_data);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002708}
2709
Ben Lindstrome9c99912001-06-09 00:41:05 +00002710
2711/* -- agent forwarding */
2712
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002713/* Sends a message to the server to request authentication fd forwarding. */
2714
Damien Miller4af51302000-04-16 11:18:38 +10002715void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00002716auth_request_forwarding(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002717{
Damien Miller95def091999-11-25 00:26:21 +11002718 packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING);
2719 packet_send();
2720 packet_write_wait();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002721}
2722
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002723/* This is called to process an SSH_SMSG_AGENT_OPEN message. */
2724
Damien Miller4af51302000-04-16 11:18:38 +10002725void
Damien Miller630d6f42002-01-22 23:17:30 +11002726auth_input_open_request(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002727{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002728 Channel *c = NULL;
2729 int remote_id, sock;
Ben Lindstrome9c99912001-06-09 00:41:05 +00002730 char *name;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002731
Damien Miller95def091999-11-25 00:26:21 +11002732 /* Read the remote channel number from the message. */
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002733 remote_id = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11002734 packet_check_eom();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002735
Damien Miller5428f641999-11-25 11:54:57 +11002736 /*
2737 * Get a connection to the local authentication agent (this may again
2738 * get forwarded).
2739 */
Damien Miller95def091999-11-25 00:26:21 +11002740 sock = ssh_get_authentication_socket();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002741
Damien Miller5428f641999-11-25 11:54:57 +11002742 /*
2743 * If we could not connect the agent, send an error message back to
2744 * the server. This should never happen unless the agent dies,
2745 * because authentication forwarding is only enabled if we have an
2746 * agent.
2747 */
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002748 if (sock >= 0) {
Ben Lindstrome9c99912001-06-09 00:41:05 +00002749 name = xstrdup("authentication agent connection");
2750 c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
2751 -1, 0, 0, 0, name, 1);
Damien Miller699d0032002-02-08 22:07:16 +11002752 c->remote_id = remote_id;
2753 c->force_drain = 1;
Damien Miller95def091999-11-25 00:26:21 +11002754 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002755 if (c == NULL) {
2756 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
2757 packet_put_int(remote_id);
2758 } else {
2759 /* Send a confirmation to the remote host. */
2760 debug("Forwarding authentication connection.");
2761 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
2762 packet_put_int(remote_id);
2763 packet_put_int(c->self);
2764 }
Damien Miller95def091999-11-25 00:26:21 +11002765 packet_send();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002766}