blob: e663c21596c2065a2cd6cec5810f8df5c00264c7 [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 Millera04ad492004-01-21 11:02:09 +110042RCSID("$OpenBSD: channels.c,v 1.200 2004/01/19 09:24:21 markus Exp $");
Damien Millerd4a8b7e1999-10-27 13:42:43 +100043
44#include "ssh.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000045#include "ssh1.h"
46#include "ssh2.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100047#include "packet.h"
48#include "xmalloc.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000049#include "log.h"
50#include "misc.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100051#include "channels.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100052#include "compat.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000053#include "canohost.h"
Damien Miller994cf142000-07-21 10:19:44 +100054#include "key.h"
55#include "authfd.h"
Damien Miller3afe3752001-12-21 12:39:51 +110056#include "pathnames.h"
Darren Tucker46471c92003-07-03 13:55:19 +100057#include "bufaux.h"
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 Miller996acd22003-04-09 20:59:48 +1000145 logit("channel_lookup: %d: bad id", id);
Damien Millerb38eff82000-04-01 11:09:21 +1000146 return NULL;
147 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000148 c = channels[id];
149 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000150 logit("channel_lookup: %d: bad id: channel free", id);
Damien Millerb38eff82000-04-01 11:09:21 +1000151 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)) {
Damien Millerfbdeece2003-09-02 22:52:31 +1000180 debug2("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;
Damien Miller95def091999-11-25 00:26:21 +1100220 }
221 /* Try to find a free slot where to put the new channel. */
222 for (found = -1, i = 0; i < channels_alloc; i++)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000223 if (channels[i] == NULL) {
Damien Miller95def091999-11-25 00:26:21 +1100224 /* Found a free slot. */
225 found = i;
226 break;
227 }
228 if (found == -1) {
Damien Miller5428f641999-11-25 11:54:57 +1100229 /* There are no free slots. Take last+1 slot and expand the array. */
Damien Miller95def091999-11-25 00:26:21 +1100230 found = channels_alloc;
Damien Miller9403aa22002-06-26 19:14:43 +1000231 if (channels_alloc > 10000)
232 fatal("channel_new: internal error: channels_alloc %d "
233 "too big.", channels_alloc);
Damien Miller5efcecc2003-09-17 07:31:14 +1000234 channels = xrealloc(channels,
235 (channels_alloc + 10) * sizeof(Channel *));
236 channels_alloc += 10;
Damien Millerd3444942000-09-30 14:20:03 +1100237 debug2("channel: expanding %d", channels_alloc);
Damien Miller95def091999-11-25 00:26:21 +1100238 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;
Damien Millerb1ca8bb2003-05-14 13:45:42 +1000259 c->remote_name = xstrdup(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{
Damien Millerfbdeece2003-09-02 22:52:31 +1000307 debug3("channel %d: close_fds r %d w %d e %d",
Ben Lindstromc0dee1a2001-06-05 20:52:50 +0000308 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++;
Damien Millerfbdeece2003-09-02 22:52:31 +1000327 debug("channel %d: free: %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();
Damien Millerfbdeece2003-09-02 22:52:31 +1000331 debug3("channel %d: status: %s", c->self, 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()) {
Damien Miller275295e2003-01-08 14:04:09 +1100416 debug2("channel %d: big input buffer %d",
Ben Lindstrome9c99912001-06-09 00:41:05 +0000417 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()) {
Darren Tucker502d3842003-06-28 12:38:01 +1000422 debug2("channel %d: big output buffer %u > %u",
Damien Milleraf5f2e62001-10-10 15:01:16 +1000423 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) {
Damien Miller996acd22003-04-09 20:59:48 +1000578 logit("channel_send_open: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000579 return;
580 }
Ben Lindstrom1d568f92002-12-23 02:44:36 +0000581 debug2("channel %d: send open", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000582 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
Ben Lindstrom1d568f92002-12-23 02:44:36 +0000591channel_request_start(int id, char *service, int wantconfirm)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000592{
Ben Lindstrom1d568f92002-12-23 02:44:36 +0000593 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000594
Ben Lindstrome9c99912001-06-09 00:41:05 +0000595 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000596 logit("channel_request_start: %d: unknown channel id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000597 return;
598 }
Damien Millerfbdeece2003-09-02 22:52:31 +1000599 debug2("channel %d: request %s", 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 Miller996acd22003-04-09 20:59:48 +1000611 logit("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) {
Damien Miller996acd22003-04-09 20:59:48 +1000622 logit("channel_register_cleanup: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000623 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) {
Damien Miller996acd22003-04-09 20:59:48 +1000633 logit("channel_cancel_cleanup: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000634 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) {
Damien Miller996acd22003-04-09 20:59:48 +1000644 logit("channel_register_filter: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000645 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;
Damien Millerfbdeece2003-09-02 22:52:31 +1000742 debug2("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 {
Damien Millerfbdeece2003-09-02 22:52:31 +1000783 debug2("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) {
Damien Millerfbdeece2003-09-02 22:52:31 +1000796 debug2("X11 connection uses different authentication protocol.");
Damien Millerb38eff82000-04-01 11:09:21 +1000797 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) {
Damien Millerfbdeece2003-09-02 22:52:31 +1000803 debug2("X11 auth data does not match fake data.");
Damien Millerb38eff82000-04-01 11:09:21 +1000804 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 */
Damien Miller996acd22003-04-09 20:59:48 +1000836 logit("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 Miller996acd22003-04-09 20:59:48 +1000859 logit("X11 connection rejected because of wrong authentication.");
Damien Millerfbdeece2003-09-02 22:52:31 +1000860 debug2("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 Millerfbdeece2003-09-02 22:52:31 +1000870 debug2("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate);
Damien Millerb38eff82000-04-01 11:09:21 +1000871 }
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
Damien Millerfbdeece2003-09-02 22:52:31 +1000928 debug2("channel %d: dynamic request: socks4 host %s port %u command %u",
Ben Lindstrom6fa9d102001-04-11 23:08:17 +0000929 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
Darren Tucker46471c92003-07-03 13:55:19 +1000944/* try to decode a socks5 header */
945#define SSH_SOCKS5_AUTHDONE 0x1000
946#define SSH_SOCKS5_NOAUTH 0x00
947#define SSH_SOCKS5_IPV4 0x01
948#define SSH_SOCKS5_DOMAIN 0x03
949#define SSH_SOCKS5_IPV6 0x04
950#define SSH_SOCKS5_CONNECT 0x01
951#define SSH_SOCKS5_SUCCESS 0x00
952
953static int
954channel_decode_socks5(Channel *c, fd_set * readset, fd_set * writeset)
955{
956 struct {
957 u_int8_t version;
958 u_int8_t command;
959 u_int8_t reserved;
960 u_int8_t atyp;
961 } s5_req, s5_rsp;
962 u_int16_t dest_port;
963 u_char *p, dest_addr[255+1];
964 int i, have, found, nmethods, addrlen, af;
965
966 debug2("channel %d: decode socks5", c->self);
967 p = buffer_ptr(&c->input);
968 if (p[0] != 0x05)
969 return -1;
970 have = buffer_len(&c->input);
971 if (!(c->flags & SSH_SOCKS5_AUTHDONE)) {
972 /* format: ver | nmethods | methods */
Damien Millera8e06ce2003-11-21 23:48:55 +1100973 if (have < 2)
Darren Tucker46471c92003-07-03 13:55:19 +1000974 return 0;
975 nmethods = p[1];
976 if (have < nmethods + 2)
977 return 0;
978 /* look for method: "NO AUTHENTICATION REQUIRED" */
979 for (found = 0, i = 2 ; i < nmethods + 2; i++) {
980 if (p[i] == SSH_SOCKS5_NOAUTH ) {
981 found = 1;
982 break;
983 }
984 }
985 if (!found) {
986 debug("channel %d: method SSH_SOCKS5_NOAUTH not found",
987 c->self);
988 return -1;
989 }
990 buffer_consume(&c->input, nmethods + 2);
991 buffer_put_char(&c->output, 0x05); /* version */
992 buffer_put_char(&c->output, SSH_SOCKS5_NOAUTH); /* method */
993 FD_SET(c->sock, writeset);
994 c->flags |= SSH_SOCKS5_AUTHDONE;
995 debug2("channel %d: socks5 auth done", c->self);
996 return 0; /* need more */
997 }
998 debug2("channel %d: socks5 post auth", c->self);
999 if (have < sizeof(s5_req)+1)
1000 return 0; /* need more */
1001 memcpy((char *)&s5_req, p, sizeof(s5_req));
1002 if (s5_req.version != 0x05 ||
1003 s5_req.command != SSH_SOCKS5_CONNECT ||
1004 s5_req.reserved != 0x00) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001005 debug2("channel %d: only socks5 connect supported", c->self);
Darren Tucker46471c92003-07-03 13:55:19 +10001006 return -1;
1007 }
1008 switch(s5_req.atyp){
1009 case SSH_SOCKS5_IPV4:
1010 addrlen = 4;
1011 af = AF_INET;
1012 break;
1013 case SSH_SOCKS5_DOMAIN:
1014 addrlen = p[sizeof(s5_req)];
1015 af = -1;
1016 break;
1017 case SSH_SOCKS5_IPV6:
1018 addrlen = 16;
1019 af = AF_INET6;
1020 break;
1021 default:
Damien Millerfbdeece2003-09-02 22:52:31 +10001022 debug2("channel %d: bad socks5 atyp %d", c->self, s5_req.atyp);
Darren Tucker46471c92003-07-03 13:55:19 +10001023 return -1;
1024 }
1025 if (have < 4 + addrlen + 2)
1026 return 0;
1027 buffer_consume(&c->input, sizeof(s5_req));
1028 if (s5_req.atyp == SSH_SOCKS5_DOMAIN)
1029 buffer_consume(&c->input, 1); /* host string length */
1030 buffer_get(&c->input, (char *)&dest_addr, addrlen);
1031 buffer_get(&c->input, (char *)&dest_port, 2);
1032 dest_addr[addrlen] = '\0';
1033 if (s5_req.atyp == SSH_SOCKS5_DOMAIN)
1034 strlcpy(c->path, dest_addr, sizeof(c->path));
1035 else if (inet_ntop(af, dest_addr, c->path, sizeof(c->path)) == NULL)
1036 return -1;
1037 c->host_port = ntohs(dest_port);
Damien Miller787b2ec2003-11-21 23:56:47 +11001038
Damien Millerfbdeece2003-09-02 22:52:31 +10001039 debug2("channel %d: dynamic request: socks5 host %s port %u command %u",
Darren Tucker46471c92003-07-03 13:55:19 +10001040 c->self, c->path, c->host_port, s5_req.command);
1041
1042 s5_rsp.version = 0x05;
1043 s5_rsp.command = SSH_SOCKS5_SUCCESS;
1044 s5_rsp.reserved = 0; /* ignored */
1045 s5_rsp.atyp = SSH_SOCKS5_IPV4;
1046 ((struct in_addr *)&dest_addr)->s_addr = INADDR_ANY;
1047 dest_port = 0; /* ignored */
1048
1049 buffer_append(&c->output, (char *)&s5_rsp, sizeof(s5_rsp));
1050 buffer_append(&c->output, (char *)&dest_addr, sizeof(struct in_addr));
1051 buffer_append(&c->output, (char *)&dest_port, sizeof(dest_port));
1052 return 1;
1053}
1054
Ben Lindstromb3921512001-04-11 15:57:50 +00001055/* dynamic port forwarding */
Ben Lindstrombba81212001-06-25 05:01:22 +00001056static void
Ben Lindstromb3921512001-04-11 15:57:50 +00001057channel_pre_dynamic(Channel *c, fd_set * readset, fd_set * writeset)
1058{
1059 u_char *p;
1060 int have, ret;
1061
1062 have = buffer_len(&c->input);
Damien Miller4623a752001-10-10 15:03:58 +10001063 c->delayed = 0;
Ben Lindstromb3921512001-04-11 15:57:50 +00001064 debug2("channel %d: pre_dynamic: have %d", c->self, have);
Ben Lindstromc486d882001-04-11 16:08:34 +00001065 /* buffer_dump(&c->input); */
Ben Lindstromb3921512001-04-11 15:57:50 +00001066 /* check if the fixed size part of the packet is in buffer. */
Darren Tucker46471c92003-07-03 13:55:19 +10001067 if (have < 3) {
Ben Lindstromb3921512001-04-11 15:57:50 +00001068 /* need more */
1069 FD_SET(c->sock, readset);
1070 return;
1071 }
1072 /* try to guess the protocol */
1073 p = buffer_ptr(&c->input);
1074 switch (p[0]) {
Ben Lindstrom6fa9d102001-04-11 23:08:17 +00001075 case 0x04:
1076 ret = channel_decode_socks4(c, readset, writeset);
1077 break;
Darren Tucker46471c92003-07-03 13:55:19 +10001078 case 0x05:
1079 ret = channel_decode_socks5(c, readset, writeset);
1080 break;
Ben Lindstromb3921512001-04-11 15:57:50 +00001081 default:
1082 ret = -1;
1083 break;
1084 }
1085 if (ret < 0) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001086 chan_mark_dead(c);
Ben Lindstromb3921512001-04-11 15:57:50 +00001087 } else if (ret == 0) {
1088 debug2("channel %d: pre_dynamic: need more", c->self);
1089 /* need more */
1090 FD_SET(c->sock, readset);
1091 } else {
1092 /* switch to the next state */
1093 c->type = SSH_CHANNEL_OPENING;
1094 port_open_helper(c, "direct-tcpip");
1095 }
1096}
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001097
Damien Millerb38eff82000-04-01 11:09:21 +10001098/* This is our fake X11 server socket. */
Ben Lindstrombba81212001-06-25 05:01:22 +00001099static void
Damien Millerb38eff82000-04-01 11:09:21 +10001100channel_post_x11_listener(Channel *c, fd_set * readset, fd_set * writeset)
1101{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001102 Channel *nc;
Damien Millerb38eff82000-04-01 11:09:21 +10001103 struct sockaddr addr;
Damien Miller398e1cf2002-02-05 11:52:13 +11001104 int newsock;
Damien Millerb38eff82000-04-01 11:09:21 +10001105 socklen_t addrlen;
Damien Millerd83ff352001-01-30 09:19:34 +11001106 char buf[16384], *remote_ipaddr;
Damien Millerbd483e72000-04-30 10:00:53 +10001107 int remote_port;
Damien Millerb38eff82000-04-01 11:09:21 +10001108
1109 if (FD_ISSET(c->sock, readset)) {
1110 debug("X11 connection requested.");
1111 addrlen = sizeof(addr);
1112 newsock = accept(c->sock, &addr, &addrlen);
Damien Millere7378562001-12-21 14:58:35 +11001113 if (c->single_connection) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001114 debug2("single_connection: closing X11 listener.");
Damien Millere7378562001-12-21 14:58:35 +11001115 channel_close_fd(&c->sock);
1116 chan_mark_dead(c);
1117 }
Damien Millerb38eff82000-04-01 11:09:21 +10001118 if (newsock < 0) {
1119 error("accept: %.100s", strerror(errno));
1120 return;
1121 }
Damien Miller398e1cf2002-02-05 11:52:13 +11001122 set_nodelay(newsock);
Damien Millerd83ff352001-01-30 09:19:34 +11001123 remote_ipaddr = get_peer_ipaddr(newsock);
Damien Millerbd483e72000-04-30 10:00:53 +10001124 remote_port = get_peer_port(newsock);
Damien Millerb38eff82000-04-01 11:09:21 +10001125 snprintf(buf, sizeof buf, "X11 connection from %.200s port %d",
Damien Millerd83ff352001-01-30 09:19:34 +11001126 remote_ipaddr, remote_port);
Damien Millerbd483e72000-04-30 10:00:53 +10001127
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001128 nc = channel_new("accepted x11 socket",
Damien Millerbd483e72000-04-30 10:00:53 +10001129 SSH_CHANNEL_OPENING, newsock, newsock, -1,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001130 c->local_window_max, c->local_maxpacket, 0, buf, 1);
Damien Millerbd483e72000-04-30 10:00:53 +10001131 if (compat20) {
1132 packet_start(SSH2_MSG_CHANNEL_OPEN);
1133 packet_put_cstring("x11");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001134 packet_put_int(nc->self);
Damien Millere7378562001-12-21 14:58:35 +11001135 packet_put_int(nc->local_window_max);
1136 packet_put_int(nc->local_maxpacket);
Damien Millerd83ff352001-01-30 09:19:34 +11001137 /* originator ipaddr and port */
1138 packet_put_cstring(remote_ipaddr);
Damien Miller30c3d422000-05-09 11:02:59 +10001139 if (datafellows & SSH_BUG_X11FWD) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001140 debug2("ssh2 x11 bug compat mode");
Damien Miller30c3d422000-05-09 11:02:59 +10001141 } else {
1142 packet_put_int(remote_port);
1143 }
Damien Millerbd483e72000-04-30 10:00:53 +10001144 packet_send();
1145 } else {
1146 packet_start(SSH_SMSG_X11_OPEN);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001147 packet_put_int(nc->self);
Ben Lindstrome9c99912001-06-09 00:41:05 +00001148 if (packet_get_protocol_flags() &
1149 SSH_PROTOFLAG_HOST_IN_FWD_OPEN)
Ben Lindstrom664408d2001-06-09 01:42:01 +00001150 packet_put_cstring(buf);
Damien Millerbd483e72000-04-30 10:00:53 +10001151 packet_send();
1152 }
Damien Millerd83ff352001-01-30 09:19:34 +11001153 xfree(remote_ipaddr);
Damien Millerb38eff82000-04-01 11:09:21 +10001154 }
1155}
1156
Ben Lindstrombba81212001-06-25 05:01:22 +00001157static void
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001158port_open_helper(Channel *c, char *rtype)
1159{
1160 int direct;
1161 char buf[1024];
1162 char *remote_ipaddr = get_peer_ipaddr(c->sock);
1163 u_short remote_port = get_peer_port(c->sock);
1164
1165 direct = (strcmp(rtype, "direct-tcpip") == 0);
1166
1167 snprintf(buf, sizeof buf,
1168 "%s: listening port %d for %.100s port %d, "
1169 "connect from %.200s port %d",
1170 rtype, c->listening_port, c->path, c->host_port,
1171 remote_ipaddr, remote_port);
1172
1173 xfree(c->remote_name);
1174 c->remote_name = xstrdup(buf);
1175
1176 if (compat20) {
1177 packet_start(SSH2_MSG_CHANNEL_OPEN);
1178 packet_put_cstring(rtype);
1179 packet_put_int(c->self);
1180 packet_put_int(c->local_window_max);
1181 packet_put_int(c->local_maxpacket);
1182 if (direct) {
1183 /* target host, port */
1184 packet_put_cstring(c->path);
1185 packet_put_int(c->host_port);
1186 } else {
1187 /* listen address, port */
1188 packet_put_cstring(c->path);
1189 packet_put_int(c->listening_port);
1190 }
1191 /* originator host and port */
1192 packet_put_cstring(remote_ipaddr);
1193 packet_put_int(remote_port);
1194 packet_send();
1195 } else {
1196 packet_start(SSH_MSG_PORT_OPEN);
1197 packet_put_int(c->self);
1198 packet_put_cstring(c->path);
1199 packet_put_int(c->host_port);
Ben Lindstrome9c99912001-06-09 00:41:05 +00001200 if (packet_get_protocol_flags() &
1201 SSH_PROTOFLAG_HOST_IN_FWD_OPEN)
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001202 packet_put_cstring(c->remote_name);
1203 packet_send();
1204 }
1205 xfree(remote_ipaddr);
1206}
1207
Damien Millerb38eff82000-04-01 11:09:21 +10001208/*
1209 * This socket is listening for connections to a forwarded TCP/IP port.
1210 */
Ben Lindstrombba81212001-06-25 05:01:22 +00001211static void
Damien Millerb38eff82000-04-01 11:09:21 +10001212channel_post_port_listener(Channel *c, fd_set * readset, fd_set * writeset)
1213{
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001214 Channel *nc;
Damien Millerb38eff82000-04-01 11:09:21 +10001215 struct sockaddr addr;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001216 int newsock, nextstate;
Damien Millerb38eff82000-04-01 11:09:21 +10001217 socklen_t addrlen;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001218 char *rtype;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001219
Damien Millerb38eff82000-04-01 11:09:21 +10001220 if (FD_ISSET(c->sock, readset)) {
1221 debug("Connection to port %d forwarding "
1222 "to %.100s port %d requested.",
1223 c->listening_port, c->path, c->host_port);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001224
Damien Miller4623a752001-10-10 15:03:58 +10001225 if (c->type == SSH_CHANNEL_RPORT_LISTENER) {
1226 nextstate = SSH_CHANNEL_OPENING;
1227 rtype = "forwarded-tcpip";
1228 } else {
1229 if (c->host_port == 0) {
1230 nextstate = SSH_CHANNEL_DYNAMIC;
Damien Millerd3c04b92001-10-10 15:04:20 +10001231 rtype = "dynamic-tcpip";
Damien Miller4623a752001-10-10 15:03:58 +10001232 } else {
1233 nextstate = SSH_CHANNEL_OPENING;
1234 rtype = "direct-tcpip";
1235 }
1236 }
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001237
Damien Millerb38eff82000-04-01 11:09:21 +10001238 addrlen = sizeof(addr);
1239 newsock = accept(c->sock, &addr, &addrlen);
1240 if (newsock < 0) {
1241 error("accept: %.100s", strerror(errno));
1242 return;
1243 }
Ben Lindstrom1ebd7a52002-02-26 18:12:51 +00001244 set_nodelay(newsock);
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001245 nc = channel_new(rtype, nextstate, newsock, newsock, -1,
1246 c->local_window_max, c->local_maxpacket, 0, rtype, 1);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001247 nc->listening_port = c->listening_port;
1248 nc->host_port = c->host_port;
1249 strlcpy(nc->path, c->path, sizeof(nc->path));
1250
Damien Miller4623a752001-10-10 15:03:58 +10001251 if (nextstate == SSH_CHANNEL_DYNAMIC) {
1252 /*
1253 * do not call the channel_post handler until
1254 * this flag has been reset by a pre-handler.
1255 * otherwise the FD_ISSET calls might overflow
1256 */
1257 nc->delayed = 1;
1258 } else {
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001259 port_open_helper(nc, rtype);
Damien Miller4623a752001-10-10 15:03:58 +10001260 }
Damien Millerb38eff82000-04-01 11:09:21 +10001261 }
1262}
1263
1264/*
1265 * This is the authentication agent socket listening for connections from
1266 * clients.
1267 */
Ben Lindstrombba81212001-06-25 05:01:22 +00001268static void
Damien Millerb38eff82000-04-01 11:09:21 +10001269channel_post_auth_listener(Channel *c, fd_set * readset, fd_set * writeset)
1270{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001271 Channel *nc;
1272 int newsock;
Damien Millerb38eff82000-04-01 11:09:21 +10001273 struct sockaddr addr;
Damien Millerb38eff82000-04-01 11:09:21 +10001274 socklen_t addrlen;
1275
1276 if (FD_ISSET(c->sock, readset)) {
1277 addrlen = sizeof(addr);
1278 newsock = accept(c->sock, &addr, &addrlen);
1279 if (newsock < 0) {
1280 error("accept from auth socket: %.100s", strerror(errno));
1281 return;
1282 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001283 nc = channel_new("accepted auth socket",
Damien Miller0bc1bd82000-11-13 22:57:25 +11001284 SSH_CHANNEL_OPENING, newsock, newsock, -1,
1285 c->local_window_max, c->local_maxpacket,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001286 0, "accepted auth socket", 1);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001287 if (compat20) {
1288 packet_start(SSH2_MSG_CHANNEL_OPEN);
1289 packet_put_cstring("auth-agent@openssh.com");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001290 packet_put_int(nc->self);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001291 packet_put_int(c->local_window_max);
1292 packet_put_int(c->local_maxpacket);
1293 } else {
1294 packet_start(SSH_SMSG_AGENT_OPEN);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001295 packet_put_int(nc->self);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001296 }
Damien Millerb38eff82000-04-01 11:09:21 +10001297 packet_send();
1298 }
1299}
1300
Ben Lindstrombba81212001-06-25 05:01:22 +00001301static void
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001302channel_post_connecting(Channel *c, fd_set * readset, fd_set * writeset)
1303{
Ben Lindstrom69128662001-05-08 20:07:39 +00001304 int err = 0;
Ben Lindstrom11180952001-07-04 05:13:35 +00001305 socklen_t sz = sizeof(err);
Ben Lindstrom69128662001-05-08 20:07:39 +00001306
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001307 if (FD_ISSET(c->sock, writeset)) {
Ben Lindstrom733a2352002-03-05 01:31:28 +00001308 if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, &err, &sz) < 0) {
Ben Lindstrom69128662001-05-08 20:07:39 +00001309 err = errno;
1310 error("getsockopt SO_ERROR failed");
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001311 }
Ben Lindstrom69128662001-05-08 20:07:39 +00001312 if (err == 0) {
1313 debug("channel %d: connected", c->self);
1314 c->type = SSH_CHANNEL_OPEN;
1315 if (compat20) {
1316 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1317 packet_put_int(c->remote_id);
1318 packet_put_int(c->self);
1319 packet_put_int(c->local_window);
1320 packet_put_int(c->local_maxpacket);
1321 } else {
1322 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1323 packet_put_int(c->remote_id);
1324 packet_put_int(c->self);
1325 }
1326 } else {
1327 debug("channel %d: not connected: %s",
1328 c->self, strerror(err));
1329 if (compat20) {
1330 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1331 packet_put_int(c->remote_id);
1332 packet_put_int(SSH2_OPEN_CONNECT_FAILED);
1333 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1334 packet_put_cstring(strerror(err));
1335 packet_put_cstring("");
1336 }
1337 } else {
1338 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1339 packet_put_int(c->remote_id);
1340 }
1341 chan_mark_dead(c);
1342 }
1343 packet_send();
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001344 }
1345}
1346
Ben Lindstrombba81212001-06-25 05:01:22 +00001347static int
Damien Millerb38eff82000-04-01 11:09:21 +10001348channel_handle_rfd(Channel *c, fd_set * readset, fd_set * writeset)
1349{
1350 char buf[16*1024];
1351 int len;
1352
Ben Lindstromc0dee1a2001-06-05 20:52:50 +00001353 if (c->rfd != -1 &&
Damien Millerb38eff82000-04-01 11:09:21 +10001354 FD_ISSET(c->rfd, readset)) {
1355 len = read(c->rfd, buf, sizeof(buf));
Damien Miller6f83b8e2000-05-02 09:23:45 +10001356 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1357 return 1;
Damien Millerb38eff82000-04-01 11:09:21 +10001358 if (len <= 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001359 debug2("channel %d: read<=0 rfd %d len %d",
Damien Millerb38eff82000-04-01 11:09:21 +10001360 c->self, c->rfd, len);
Ben Lindstromb3921512001-04-11 15:57:50 +00001361 if (c->type != SSH_CHANNEL_OPEN) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001362 debug2("channel %d: not open", c->self);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001363 chan_mark_dead(c);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001364 return -1;
Ben Lindstromb3921512001-04-11 15:57:50 +00001365 } else if (compat13) {
Damien Miller76765c02002-01-22 23:21:15 +11001366 buffer_clear(&c->output);
Damien Millerb38eff82000-04-01 11:09:21 +10001367 c->type = SSH_CHANNEL_INPUT_DRAINING;
Damien Millerfbdeece2003-09-02 22:52:31 +10001368 debug2("channel %d: input draining.", c->self);
Damien Millerb38eff82000-04-01 11:09:21 +10001369 } else {
1370 chan_read_failed(c);
1371 }
1372 return -1;
1373 }
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00001374 if (c->input_filter != NULL) {
Damien Millerad833b32000-08-23 10:46:23 +10001375 if (c->input_filter(c, buf, len) == -1) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001376 debug2("channel %d: filter stops", c->self);
Damien Millerad833b32000-08-23 10:46:23 +10001377 chan_read_failed(c);
1378 }
1379 } else {
1380 buffer_append(&c->input, buf, len);
1381 }
Damien Millerb38eff82000-04-01 11:09:21 +10001382 }
1383 return 1;
1384}
Ben Lindstrombba81212001-06-25 05:01:22 +00001385static int
Damien Millerb38eff82000-04-01 11:09:21 +10001386channel_handle_wfd(Channel *c, fd_set * readset, fd_set * writeset)
1387{
Ben Lindstrome229b252001-03-05 06:28:06 +00001388 struct termios tio;
Ben Lindstrom6d218f42001-09-18 05:53:12 +00001389 u_char *data;
1390 u_int dlen;
Damien Millerb38eff82000-04-01 11:09:21 +10001391 int len;
1392
1393 /* Send buffered output data to the socket. */
Ben Lindstromc0dee1a2001-06-05 20:52:50 +00001394 if (c->wfd != -1 &&
Damien Millerb38eff82000-04-01 11:09:21 +10001395 FD_ISSET(c->wfd, writeset) &&
1396 buffer_len(&c->output) > 0) {
Ben Lindstrom6d218f42001-09-18 05:53:12 +00001397 data = buffer_ptr(&c->output);
1398 dlen = buffer_len(&c->output);
Ben Lindstrom92ea0ea2002-07-04 18:11:09 +00001399#ifdef _AIX
Damien Millera8e06ce2003-11-21 23:48:55 +11001400 /* XXX: Later AIX versions can't push as much data to tty */
Darren Tucker240fdfa2003-11-22 14:10:02 +11001401 if (compat20 && c->wfd_isatty)
1402 dlen = MIN(dlen, 8*1024);
Ben Lindstrom92ea0ea2002-07-04 18:11:09 +00001403#endif
Ben Lindstrombeb5f332002-07-22 15:28:53 +00001404 len = write(c->wfd, data, dlen);
Damien Miller6f83b8e2000-05-02 09:23:45 +10001405 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1406 return 1;
Damien Millerb38eff82000-04-01 11:09:21 +10001407 if (len <= 0) {
Ben Lindstromb3921512001-04-11 15:57:50 +00001408 if (c->type != SSH_CHANNEL_OPEN) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001409 debug2("channel %d: not open", c->self);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001410 chan_mark_dead(c);
Ben Lindstromb3921512001-04-11 15:57:50 +00001411 return -1;
1412 } else if (compat13) {
Damien Miller76765c02002-01-22 23:21:15 +11001413 buffer_clear(&c->output);
Damien Millerfbdeece2003-09-02 22:52:31 +10001414 debug2("channel %d: input draining.", c->self);
Damien Millerb38eff82000-04-01 11:09:21 +10001415 c->type = SSH_CHANNEL_INPUT_DRAINING;
1416 } else {
1417 chan_write_failed(c);
1418 }
1419 return -1;
1420 }
Ben Lindstrom6d218f42001-09-18 05:53:12 +00001421 if (compat20 && c->isatty && dlen >= 1 && data[0] != '\r') {
Damien Miller79438cc2001-02-16 12:34:57 +11001422 if (tcgetattr(c->wfd, &tio) == 0 &&
1423 !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) {
1424 /*
1425 * Simulate echo to reduce the impact of
Ben Lindstromb40204b2001-03-05 06:29:44 +00001426 * traffic analysis. We need to match the
Ben Lindstrome229b252001-03-05 06:28:06 +00001427 * size of a SSH2_MSG_CHANNEL_DATA message
1428 * (4 byte channel id + data)
Damien Miller79438cc2001-02-16 12:34:57 +11001429 */
Ben Lindstrome229b252001-03-05 06:28:06 +00001430 packet_send_ignore(4 + len);
Damien Miller79438cc2001-02-16 12:34:57 +11001431 packet_send();
Damien Miller79438cc2001-02-16 12:34:57 +11001432 }
1433 }
Damien Millerb38eff82000-04-01 11:09:21 +10001434 buffer_consume(&c->output, len);
Damien Miller33b13562000-04-04 14:38:59 +10001435 if (compat20 && len > 0) {
1436 c->local_consumed += len;
1437 }
1438 }
1439 return 1;
1440}
Ben Lindstrombba81212001-06-25 05:01:22 +00001441static int
Damien Miller33b13562000-04-04 14:38:59 +10001442channel_handle_efd(Channel *c, fd_set * readset, fd_set * writeset)
1443{
1444 char buf[16*1024];
1445 int len;
1446
Damien Miller1383bd82000-04-06 12:32:37 +10001447/** XXX handle drain efd, too */
Damien Miller33b13562000-04-04 14:38:59 +10001448 if (c->efd != -1) {
1449 if (c->extended_usage == CHAN_EXTENDED_WRITE &&
1450 FD_ISSET(c->efd, writeset) &&
1451 buffer_len(&c->extended) > 0) {
1452 len = write(c->efd, buffer_ptr(&c->extended),
1453 buffer_len(&c->extended));
Damien Millerd3444942000-09-30 14:20:03 +11001454 debug2("channel %d: written %d to efd %d",
Damien Miller33b13562000-04-04 14:38:59 +10001455 c->self, len, c->efd);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001456 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1457 return 1;
1458 if (len <= 0) {
1459 debug2("channel %d: closing write-efd %d",
1460 c->self, c->efd);
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001461 channel_close_fd(&c->efd);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001462 } else {
Damien Miller33b13562000-04-04 14:38:59 +10001463 buffer_consume(&c->extended, len);
1464 c->local_consumed += len;
1465 }
1466 } else if (c->extended_usage == CHAN_EXTENDED_READ &&
1467 FD_ISSET(c->efd, readset)) {
1468 len = read(c->efd, buf, sizeof(buf));
Damien Millerd3444942000-09-30 14:20:03 +11001469 debug2("channel %d: read %d from efd %d",
Damien Miller9f0f5c62001-12-21 14:45:46 +11001470 c->self, len, c->efd);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001471 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1472 return 1;
1473 if (len <= 0) {
1474 debug2("channel %d: closing read-efd %d",
Damien Miller1383bd82000-04-06 12:32:37 +10001475 c->self, c->efd);
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001476 channel_close_fd(&c->efd);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001477 } else {
Damien Miller33b13562000-04-04 14:38:59 +10001478 buffer_append(&c->extended, buf, len);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001479 }
Damien Miller33b13562000-04-04 14:38:59 +10001480 }
1481 }
1482 return 1;
1483}
Ben Lindstrombba81212001-06-25 05:01:22 +00001484static int
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001485channel_check_window(Channel *c)
Damien Miller33b13562000-04-04 14:38:59 +10001486{
Ben Lindstromb3921512001-04-11 15:57:50 +00001487 if (c->type == SSH_CHANNEL_OPEN &&
1488 !(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) &&
Damien Miller33b13562000-04-04 14:38:59 +10001489 c->local_window < c->local_window_max/2 &&
1490 c->local_consumed > 0) {
1491 packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
1492 packet_put_int(c->remote_id);
1493 packet_put_int(c->local_consumed);
1494 packet_send();
Damien Millerd3444942000-09-30 14:20:03 +11001495 debug2("channel %d: window %d sent adjust %d",
Damien Miller33b13562000-04-04 14:38:59 +10001496 c->self, c->local_window,
1497 c->local_consumed);
1498 c->local_window += c->local_consumed;
1499 c->local_consumed = 0;
Damien Millerb38eff82000-04-01 11:09:21 +10001500 }
1501 return 1;
1502}
1503
Ben Lindstrombba81212001-06-25 05:01:22 +00001504static void
Damien Millerde6987c2002-01-22 23:20:40 +11001505channel_post_open(Channel *c, fd_set * readset, fd_set * writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001506{
Damien Miller4623a752001-10-10 15:03:58 +10001507 if (c->delayed)
1508 return;
Damien Millerb38eff82000-04-01 11:09:21 +10001509 channel_handle_rfd(c, readset, writeset);
1510 channel_handle_wfd(c, readset, writeset);
Damien Millerde6987c2002-01-22 23:20:40 +11001511 if (!compat20)
Damien Miller4623a752001-10-10 15:03:58 +10001512 return;
Damien Miller33b13562000-04-04 14:38:59 +10001513 channel_handle_efd(c, readset, writeset);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001514 channel_check_window(c);
Damien Miller33b13562000-04-04 14:38:59 +10001515}
1516
Ben Lindstrombba81212001-06-25 05:01:22 +00001517static void
Damien Millerb38eff82000-04-01 11:09:21 +10001518channel_post_output_drain_13(Channel *c, fd_set * readset, fd_set * writeset)
1519{
1520 int len;
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +00001521
Damien Millerb38eff82000-04-01 11:09:21 +10001522 /* Send buffered output data to the socket. */
1523 if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) {
1524 len = write(c->sock, buffer_ptr(&c->output),
1525 buffer_len(&c->output));
1526 if (len <= 0)
Damien Miller76765c02002-01-22 23:21:15 +11001527 buffer_clear(&c->output);
Damien Millerb38eff82000-04-01 11:09:21 +10001528 else
1529 buffer_consume(&c->output, len);
1530 }
1531}
1532
Ben Lindstrombba81212001-06-25 05:01:22 +00001533static void
Damien Miller33b13562000-04-04 14:38:59 +10001534channel_handler_init_20(void)
1535{
Damien Millerde6987c2002-01-22 23:20:40 +11001536 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open;
Damien Millerbd483e72000-04-30 10:00:53 +10001537 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open;
Damien Miller33b13562000-04-04 14:38:59 +10001538 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001539 channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener;
Damien Millerbd483e72000-04-30 10:00:53 +10001540 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001541 channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001542 channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001543 channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
Damien Miller33b13562000-04-04 14:38:59 +10001544
Damien Millerde6987c2002-01-22 23:20:40 +11001545 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open;
Damien Miller33b13562000-04-04 14:38:59 +10001546 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001547 channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener;
Damien Millerbd483e72000-04-30 10:00:53 +10001548 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001549 channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001550 channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
Damien Millerde6987c2002-01-22 23:20:40 +11001551 channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open;
Damien Miller33b13562000-04-04 14:38:59 +10001552}
1553
Ben Lindstrombba81212001-06-25 05:01:22 +00001554static void
Damien Millerb38eff82000-04-01 11:09:21 +10001555channel_handler_init_13(void)
1556{
1557 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13;
1558 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_13;
1559 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
1560 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
1561 channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
1562 channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining;
1563 channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001564 channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001565 channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
Damien Millerb38eff82000-04-01 11:09:21 +10001566
Damien Millerde6987c2002-01-22 23:20:40 +11001567 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open;
Damien Millerb38eff82000-04-01 11:09:21 +10001568 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
1569 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
1570 channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
1571 channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001572 channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
Damien Millerde6987c2002-01-22 23:20:40 +11001573 channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open;
Damien Millerb38eff82000-04-01 11:09:21 +10001574}
1575
Ben Lindstrombba81212001-06-25 05:01:22 +00001576static void
Damien Millerb38eff82000-04-01 11:09:21 +10001577channel_handler_init_15(void)
1578{
Damien Millerde6987c2002-01-22 23:20:40 +11001579 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open;
Damien Millerbd483e72000-04-30 10:00:53 +10001580 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open;
Damien Millerb38eff82000-04-01 11:09:21 +10001581 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
1582 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
1583 channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001584 channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001585 channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
Damien Millerb38eff82000-04-01 11:09:21 +10001586
1587 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
1588 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
1589 channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
Damien Millerde6987c2002-01-22 23:20:40 +11001590 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001591 channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
Damien Millerde6987c2002-01-22 23:20:40 +11001592 channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open;
Damien Millerb38eff82000-04-01 11:09:21 +10001593}
1594
Ben Lindstrombba81212001-06-25 05:01:22 +00001595static void
Damien Millerb38eff82000-04-01 11:09:21 +10001596channel_handler_init(void)
1597{
1598 int i;
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +00001599
Damien Miller9f0f5c62001-12-21 14:45:46 +11001600 for (i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) {
Damien Millerb38eff82000-04-01 11:09:21 +10001601 channel_pre[i] = NULL;
1602 channel_post[i] = NULL;
1603 }
Damien Miller33b13562000-04-04 14:38:59 +10001604 if (compat20)
1605 channel_handler_init_20();
1606 else if (compat13)
Damien Millerb38eff82000-04-01 11:09:21 +10001607 channel_handler_init_13();
1608 else
1609 channel_handler_init_15();
1610}
1611
Damien Miller3ec27592001-10-12 11:35:04 +10001612/* gc dead channels */
1613static void
1614channel_garbage_collect(Channel *c)
1615{
1616 if (c == NULL)
1617 return;
1618 if (c->detach_user != NULL) {
1619 if (!chan_is_dead(c, 0))
1620 return;
Damien Millerfbdeece2003-09-02 22:52:31 +10001621 debug2("channel %d: gc: notify user", c->self);
Damien Miller3ec27592001-10-12 11:35:04 +10001622 c->detach_user(c->self, NULL);
1623 /* if we still have a callback */
1624 if (c->detach_user != NULL)
1625 return;
Damien Millerfbdeece2003-09-02 22:52:31 +10001626 debug2("channel %d: gc: user detached", c->self);
Damien Miller3ec27592001-10-12 11:35:04 +10001627 }
1628 if (!chan_is_dead(c, 1))
1629 return;
Damien Millerfbdeece2003-09-02 22:52:31 +10001630 debug2("channel %d: garbage collecting", c->self);
Damien Miller3ec27592001-10-12 11:35:04 +10001631 channel_free(c);
1632}
1633
Ben Lindstrombba81212001-06-25 05:01:22 +00001634static void
Damien Millerb38eff82000-04-01 11:09:21 +10001635channel_handler(chan_fn *ftab[], fd_set * readset, fd_set * writeset)
1636{
1637 static int did_init = 0;
1638 int i;
1639 Channel *c;
1640
1641 if (!did_init) {
1642 channel_handler_init();
1643 did_init = 1;
1644 }
1645 for (i = 0; i < channels_alloc; i++) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001646 c = channels[i];
1647 if (c == NULL)
Damien Millerb38eff82000-04-01 11:09:21 +10001648 continue;
Ben Lindstromc0dee1a2001-06-05 20:52:50 +00001649 if (ftab[c->type] != NULL)
1650 (*ftab[c->type])(c, readset, writeset);
Damien Miller3ec27592001-10-12 11:35:04 +10001651 channel_garbage_collect(c);
Damien Millerb38eff82000-04-01 11:09:21 +10001652 }
1653}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001654
Ben Lindstrome9c99912001-06-09 00:41:05 +00001655/*
1656 * Allocate/update select bitmasks and add any bits relevant to channels in
1657 * select bitmasks.
1658 */
Damien Miller4af51302000-04-16 11:18:38 +10001659void
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001660channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp,
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001661 int *nallocp, int rekeying)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001662{
Damien Miller5e953212001-01-30 09:14:00 +11001663 int n;
1664 u_int sz;
1665
1666 n = MAX(*maxfdp, channel_max_fd);
1667
1668 sz = howmany(n+1, NFDBITS) * sizeof(fd_mask);
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001669 /* perhaps check sz < nalloc/2 and shrink? */
1670 if (*readsetp == NULL || sz > *nallocp) {
1671 *readsetp = xrealloc(*readsetp, sz);
1672 *writesetp = xrealloc(*writesetp, sz);
1673 *nallocp = sz;
Damien Miller5e953212001-01-30 09:14:00 +11001674 }
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001675 *maxfdp = n;
Damien Miller5e953212001-01-30 09:14:00 +11001676 memset(*readsetp, 0, sz);
1677 memset(*writesetp, 0, sz);
1678
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001679 if (!rekeying)
1680 channel_handler(channel_pre, *readsetp, *writesetp);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001681}
1682
Ben Lindstrome9c99912001-06-09 00:41:05 +00001683/*
1684 * After select, perform any appropriate operations for channels which have
1685 * events pending.
1686 */
Damien Miller4af51302000-04-16 11:18:38 +10001687void
Damien Miller95def091999-11-25 00:26:21 +11001688channel_after_select(fd_set * readset, fd_set * writeset)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001689{
Damien Millerb38eff82000-04-01 11:09:21 +10001690 channel_handler(channel_post, readset, writeset);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001691}
1692
Ben Lindstrome9c99912001-06-09 00:41:05 +00001693
Damien Miller5e953212001-01-30 09:14:00 +11001694/* If there is data to send to the connection, enqueue some of it now. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001695
Damien Miller4af51302000-04-16 11:18:38 +10001696void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00001697channel_output_poll(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001698{
Damien Millerb38eff82000-04-01 11:09:21 +10001699 Channel *c;
Ben Lindstrom4fed2be2002-06-25 23:17:36 +00001700 int i;
1701 u_int len;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001702
Damien Miller95def091999-11-25 00:26:21 +11001703 for (i = 0; i < channels_alloc; i++) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001704 c = channels[i];
1705 if (c == NULL)
1706 continue;
Damien Miller34132e52000-01-14 15:45:46 +11001707
Ben Lindstrome9c99912001-06-09 00:41:05 +00001708 /*
1709 * We are only interested in channels that can have buffered
1710 * incoming data.
1711 */
Damien Miller34132e52000-01-14 15:45:46 +11001712 if (compat13) {
Damien Millerb38eff82000-04-01 11:09:21 +10001713 if (c->type != SSH_CHANNEL_OPEN &&
1714 c->type != SSH_CHANNEL_INPUT_DRAINING)
Damien Miller34132e52000-01-14 15:45:46 +11001715 continue;
1716 } else {
Damien Millerb38eff82000-04-01 11:09:21 +10001717 if (c->type != SSH_CHANNEL_OPEN)
Damien Miller34132e52000-01-14 15:45:46 +11001718 continue;
Damien Miller34132e52000-01-14 15:45:46 +11001719 }
Damien Millerefb4afe2000-04-12 18:45:05 +10001720 if (compat20 &&
1721 (c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) {
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001722 /* XXX is this true? */
Damien Miller3ec27592001-10-12 11:35:04 +10001723 debug3("channel %d: will not send data after close", c->self);
Damien Miller33b13562000-04-04 14:38:59 +10001724 continue;
1725 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001726
Damien Miller95def091999-11-25 00:26:21 +11001727 /* Get the amount of buffered data for this channel. */
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001728 if ((c->istate == CHAN_INPUT_OPEN ||
1729 c->istate == CHAN_INPUT_WAIT_DRAIN) &&
1730 (len = buffer_len(&c->input)) > 0) {
Ben Lindstrome9c99912001-06-09 00:41:05 +00001731 /*
1732 * Send some data for the other side over the secure
1733 * connection.
1734 */
Damien Miller33b13562000-04-04 14:38:59 +10001735 if (compat20) {
1736 if (len > c->remote_window)
1737 len = c->remote_window;
1738 if (len > c->remote_maxpacket)
1739 len = c->remote_maxpacket;
Damien Miller95def091999-11-25 00:26:21 +11001740 } else {
Damien Miller33b13562000-04-04 14:38:59 +10001741 if (packet_is_interactive()) {
1742 if (len > 1024)
1743 len = 512;
1744 } else {
1745 /* Keep the packets at reasonable size. */
1746 if (len > packet_get_maxsize()/2)
1747 len = packet_get_maxsize()/2;
1748 }
Damien Miller95def091999-11-25 00:26:21 +11001749 }
Damien Millerb38eff82000-04-01 11:09:21 +10001750 if (len > 0) {
Damien Miller33b13562000-04-04 14:38:59 +10001751 packet_start(compat20 ?
1752 SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA);
Damien Millerb38eff82000-04-01 11:09:21 +10001753 packet_put_int(c->remote_id);
1754 packet_put_string(buffer_ptr(&c->input), len);
1755 packet_send();
1756 buffer_consume(&c->input, len);
1757 c->remote_window -= len;
Damien Millerb38eff82000-04-01 11:09:21 +10001758 }
1759 } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) {
Damien Miller95def091999-11-25 00:26:21 +11001760 if (compat13)
1761 fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3");
Damien Miller5428f641999-11-25 11:54:57 +11001762 /*
1763 * input-buffer is empty and read-socket shutdown:
Ben Lindstromcf159442002-03-26 03:26:24 +00001764 * tell peer, that we will not send more data: send IEOF.
1765 * hack for extended data: delay EOF if EFD still in use.
Damien Miller5428f641999-11-25 11:54:57 +11001766 */
Ben Lindstromcf159442002-03-26 03:26:24 +00001767 if (CHANNEL_EFD_INPUT_ACTIVE(c))
Ben Lindstrom5a6abda2002-06-09 19:41:48 +00001768 debug2("channel %d: ibuf_empty delayed efd %d/(%d)",
1769 c->self, c->efd, buffer_len(&c->extended));
Ben Lindstromcf159442002-03-26 03:26:24 +00001770 else
1771 chan_ibuf_empty(c);
Damien Miller95def091999-11-25 00:26:21 +11001772 }
Damien Miller33b13562000-04-04 14:38:59 +10001773 /* Send extended data, i.e. stderr */
1774 if (compat20 &&
Ben Lindstromcf159442002-03-26 03:26:24 +00001775 !(c->flags & CHAN_EOF_SENT) &&
Damien Miller33b13562000-04-04 14:38:59 +10001776 c->remote_window > 0 &&
1777 (len = buffer_len(&c->extended)) > 0 &&
1778 c->extended_usage == CHAN_EXTENDED_READ) {
Ben Lindstrom4fed2be2002-06-25 23:17:36 +00001779 debug2("channel %d: rwin %u elen %u euse %d",
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001780 c->self, c->remote_window, buffer_len(&c->extended),
1781 c->extended_usage);
Damien Miller33b13562000-04-04 14:38:59 +10001782 if (len > c->remote_window)
1783 len = c->remote_window;
1784 if (len > c->remote_maxpacket)
1785 len = c->remote_maxpacket;
1786 packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA);
1787 packet_put_int(c->remote_id);
1788 packet_put_int(SSH2_EXTENDED_DATA_STDERR);
1789 packet_put_string(buffer_ptr(&c->extended), len);
1790 packet_send();
1791 buffer_consume(&c->extended, len);
1792 c->remote_window -= len;
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001793 debug2("channel %d: sent ext data %d", c->self, len);
Damien Miller33b13562000-04-04 14:38:59 +10001794 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001795 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001796}
1797
Ben Lindstrome9c99912001-06-09 00:41:05 +00001798
1799/* -- protocol input */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001800
Damien Miller4af51302000-04-16 11:18:38 +10001801void
Damien Miller630d6f42002-01-22 23:17:30 +11001802channel_input_data(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001803{
Damien Miller34132e52000-01-14 15:45:46 +11001804 int id;
Damien Miller95def091999-11-25 00:26:21 +11001805 char *data;
Ben Lindstrom46c16222000-12-22 01:43:59 +00001806 u_int data_len;
Damien Millerb38eff82000-04-01 11:09:21 +10001807 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001808
Damien Miller95def091999-11-25 00:26:21 +11001809 /* Get the channel number and verify it. */
Damien Miller34132e52000-01-14 15:45:46 +11001810 id = packet_get_int();
Damien Millerb38eff82000-04-01 11:09:21 +10001811 c = channel_lookup(id);
1812 if (c == NULL)
Damien Miller34132e52000-01-14 15:45:46 +11001813 packet_disconnect("Received data for nonexistent channel %d.", id);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001814
Damien Miller95def091999-11-25 00:26:21 +11001815 /* Ignore any data for non-open channels (might happen on close) */
Damien Millerb38eff82000-04-01 11:09:21 +10001816 if (c->type != SSH_CHANNEL_OPEN &&
1817 c->type != SSH_CHANNEL_X11_OPEN)
Damien Miller34132e52000-01-14 15:45:46 +11001818 return;
1819
Damien Miller95def091999-11-25 00:26:21 +11001820 /* Get the data. */
1821 data = packet_get_string(&data_len);
Damien Millerb38eff82000-04-01 11:09:21 +10001822
Damien Millera04ad492004-01-21 11:02:09 +11001823 /*
1824 * Ignore data for protocol > 1.3 if output end is no longer open.
1825 * For protocol 2 the sending side is reducing its window as it sends
1826 * data, so we must 'fake' consumption of the data in order to ensure
1827 * that window updates are sent back. Otherwise the connection might
1828 * deadlock.
1829 */
1830 if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN) {
1831 if (compat20) {
1832 c->local_window -= data_len;
1833 c->local_consumed += data_len;
1834 }
1835 xfree(data);
1836 return;
1837 }
1838
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00001839 if (compat20) {
Damien Miller33b13562000-04-04 14:38:59 +10001840 if (data_len > c->local_maxpacket) {
Damien Miller996acd22003-04-09 20:59:48 +10001841 logit("channel %d: rcvd big packet %d, maxpack %d",
Damien Miller33b13562000-04-04 14:38:59 +10001842 c->self, data_len, c->local_maxpacket);
1843 }
1844 if (data_len > c->local_window) {
Damien Miller996acd22003-04-09 20:59:48 +10001845 logit("channel %d: rcvd too much data %d, win %d",
Damien Miller33b13562000-04-04 14:38:59 +10001846 c->self, data_len, c->local_window);
1847 xfree(data);
1848 return;
1849 }
1850 c->local_window -= data_len;
Damien Miller33b13562000-04-04 14:38:59 +10001851 }
Damien Miller48b03fc2002-01-22 23:11:40 +11001852 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10001853 buffer_append(&c->output, data, data_len);
Damien Miller95def091999-11-25 00:26:21 +11001854 xfree(data);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001855}
Ben Lindstrome9c99912001-06-09 00:41:05 +00001856
Damien Miller4af51302000-04-16 11:18:38 +10001857void
Damien Miller630d6f42002-01-22 23:17:30 +11001858channel_input_extended_data(int type, u_int32_t seq, void *ctxt)
Damien Miller33b13562000-04-04 14:38:59 +10001859{
1860 int id;
Damien Miller33b13562000-04-04 14:38:59 +10001861 char *data;
Ben Lindstromdaa21792002-06-25 23:15:30 +00001862 u_int data_len, tcode;
Damien Miller33b13562000-04-04 14:38:59 +10001863 Channel *c;
1864
1865 /* Get the channel number and verify it. */
1866 id = packet_get_int();
1867 c = channel_lookup(id);
1868
1869 if (c == NULL)
1870 packet_disconnect("Received extended_data for bad channel %d.", id);
1871 if (c->type != SSH_CHANNEL_OPEN) {
Damien Miller996acd22003-04-09 20:59:48 +10001872 logit("channel %d: ext data for non open", id);
Damien Miller33b13562000-04-04 14:38:59 +10001873 return;
1874 }
Ben Lindstromcf159442002-03-26 03:26:24 +00001875 if (c->flags & CHAN_EOF_RCVD) {
1876 if (datafellows & SSH_BUG_EXTEOF)
1877 debug("channel %d: accepting ext data after eof", id);
1878 else
1879 packet_disconnect("Received extended_data after EOF "
1880 "on channel %d.", id);
1881 }
Damien Miller33b13562000-04-04 14:38:59 +10001882 tcode = packet_get_int();
1883 if (c->efd == -1 ||
1884 c->extended_usage != CHAN_EXTENDED_WRITE ||
1885 tcode != SSH2_EXTENDED_DATA_STDERR) {
Damien Miller996acd22003-04-09 20:59:48 +10001886 logit("channel %d: bad ext data", c->self);
Damien Miller33b13562000-04-04 14:38:59 +10001887 return;
1888 }
1889 data = packet_get_string(&data_len);
Damien Miller48b03fc2002-01-22 23:11:40 +11001890 packet_check_eom();
Damien Miller33b13562000-04-04 14:38:59 +10001891 if (data_len > c->local_window) {
Damien Miller996acd22003-04-09 20:59:48 +10001892 logit("channel %d: rcvd too much extended_data %d, win %d",
Damien Miller33b13562000-04-04 14:38:59 +10001893 c->self, data_len, c->local_window);
1894 xfree(data);
1895 return;
1896 }
Damien Millerd3444942000-09-30 14:20:03 +11001897 debug2("channel %d: rcvd ext data %d", c->self, data_len);
Damien Miller33b13562000-04-04 14:38:59 +10001898 c->local_window -= data_len;
1899 buffer_append(&c->extended, data, data_len);
1900 xfree(data);
1901}
1902
Damien Miller4af51302000-04-16 11:18:38 +10001903void
Damien Miller630d6f42002-01-22 23:17:30 +11001904channel_input_ieof(int type, u_int32_t seq, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10001905{
1906 int id;
1907 Channel *c;
1908
Damien Millerb38eff82000-04-01 11:09:21 +10001909 id = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11001910 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10001911 c = channel_lookup(id);
1912 if (c == NULL)
1913 packet_disconnect("Received ieof for nonexistent channel %d.", id);
1914 chan_rcvd_ieof(c);
Ben Lindstrom944c4f02001-09-18 05:51:13 +00001915
1916 /* XXX force input close */
Damien Millera90fc082002-01-22 23:19:38 +11001917 if (c->force_drain && c->istate == CHAN_INPUT_OPEN) {
Ben Lindstrom944c4f02001-09-18 05:51:13 +00001918 debug("channel %d: FORCE input drain", c->self);
1919 c->istate = CHAN_INPUT_WAIT_DRAIN;
Damien Miller73f10742002-01-22 23:34:52 +11001920 if (buffer_len(&c->input) == 0)
1921 chan_ibuf_empty(c);
Ben Lindstrom944c4f02001-09-18 05:51:13 +00001922 }
1923
Damien Millerb38eff82000-04-01 11:09:21 +10001924}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001925
Damien Miller4af51302000-04-16 11:18:38 +10001926void
Damien Miller630d6f42002-01-22 23:17:30 +11001927channel_input_close(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001928{
Damien Millerb38eff82000-04-01 11:09:21 +10001929 int id;
1930 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001931
Damien Millerb38eff82000-04-01 11:09:21 +10001932 id = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11001933 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10001934 c = channel_lookup(id);
1935 if (c == NULL)
1936 packet_disconnect("Received close for nonexistent channel %d.", id);
Damien Miller5428f641999-11-25 11:54:57 +11001937
1938 /*
1939 * Send a confirmation that we have closed the channel and no more
1940 * data is coming for it.
1941 */
Damien Miller95def091999-11-25 00:26:21 +11001942 packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION);
Damien Millerb38eff82000-04-01 11:09:21 +10001943 packet_put_int(c->remote_id);
Damien Miller95def091999-11-25 00:26:21 +11001944 packet_send();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001945
Damien Miller5428f641999-11-25 11:54:57 +11001946 /*
1947 * If the channel is in closed state, we have sent a close request,
1948 * and the other side will eventually respond with a confirmation.
1949 * Thus, we cannot free the channel here, because then there would be
1950 * no-one to receive the confirmation. The channel gets freed when
1951 * the confirmation arrives.
1952 */
Damien Millerb38eff82000-04-01 11:09:21 +10001953 if (c->type != SSH_CHANNEL_CLOSED) {
Damien Miller5428f641999-11-25 11:54:57 +11001954 /*
1955 * Not a closed channel - mark it as draining, which will
1956 * cause it to be freed later.
1957 */
Damien Miller76765c02002-01-22 23:21:15 +11001958 buffer_clear(&c->input);
Damien Millerb38eff82000-04-01 11:09:21 +10001959 c->type = SSH_CHANNEL_OUTPUT_DRAINING;
Damien Miller95def091999-11-25 00:26:21 +11001960 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001961}
1962
Damien Millerb38eff82000-04-01 11:09:21 +10001963/* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */
Damien Miller4af51302000-04-16 11:18:38 +10001964void
Damien Miller630d6f42002-01-22 23:17:30 +11001965channel_input_oclose(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001966{
Damien Millerb38eff82000-04-01 11:09:21 +10001967 int id = packet_get_int();
1968 Channel *c = channel_lookup(id);
Damien Miller66823cd2002-01-22 23:11:38 +11001969
Damien Miller48b03fc2002-01-22 23:11:40 +11001970 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10001971 if (c == NULL)
1972 packet_disconnect("Received oclose for nonexistent channel %d.", id);
1973 chan_rcvd_oclose(c);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001974}
1975
Damien Miller4af51302000-04-16 11:18:38 +10001976void
Damien Miller630d6f42002-01-22 23:17:30 +11001977channel_input_close_confirmation(int type, u_int32_t seq, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10001978{
1979 int id = packet_get_int();
1980 Channel *c = channel_lookup(id);
1981
Damien Miller48b03fc2002-01-22 23:11:40 +11001982 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10001983 if (c == NULL)
1984 packet_disconnect("Received close confirmation for "
1985 "out-of-range channel %d.", id);
1986 if (c->type != SSH_CHANNEL_CLOSED)
1987 packet_disconnect("Received close confirmation for "
1988 "non-closed channel %d (type %d).", id, c->type);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001989 channel_free(c);
Damien Millerb38eff82000-04-01 11:09:21 +10001990}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001991
Damien Miller4af51302000-04-16 11:18:38 +10001992void
Damien Miller630d6f42002-01-22 23:17:30 +11001993channel_input_open_confirmation(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001994{
Damien Millerb38eff82000-04-01 11:09:21 +10001995 int id, remote_id;
1996 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001997
Damien Millerb38eff82000-04-01 11:09:21 +10001998 id = packet_get_int();
1999 c = channel_lookup(id);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002000
Damien Millerb38eff82000-04-01 11:09:21 +10002001 if (c==NULL || c->type != SSH_CHANNEL_OPENING)
2002 packet_disconnect("Received open confirmation for "
2003 "non-opening channel %d.", id);
2004 remote_id = packet_get_int();
Damien Miller5428f641999-11-25 11:54:57 +11002005 /* Record the remote channel number and mark that the channel is now open. */
Damien Millerb38eff82000-04-01 11:09:21 +10002006 c->remote_id = remote_id;
2007 c->type = SSH_CHANNEL_OPEN;
Damien Miller33b13562000-04-04 14:38:59 +10002008
2009 if (compat20) {
2010 c->remote_window = packet_get_int();
2011 c->remote_maxpacket = packet_get_int();
Damien Miller67f0bc02002-02-05 12:23:08 +11002012 if (c->confirm) {
Damien Millerd3444942000-09-30 14:20:03 +11002013 debug2("callback start");
Damien Miller67f0bc02002-02-05 12:23:08 +11002014 c->confirm(c->self, NULL);
Damien Millerd3444942000-09-30 14:20:03 +11002015 debug2("callback done");
Damien Miller33b13562000-04-04 14:38:59 +10002016 }
Damien Millerfbdeece2003-09-02 22:52:31 +10002017 debug2("channel %d: open confirm rwindow %u rmax %u", c->self,
Damien Miller33b13562000-04-04 14:38:59 +10002018 c->remote_window, c->remote_maxpacket);
2019 }
Damien Miller48b03fc2002-01-22 23:11:40 +11002020 packet_check_eom();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002021}
2022
Ben Lindstrombba81212001-06-25 05:01:22 +00002023static char *
Ben Lindstrom69128662001-05-08 20:07:39 +00002024reason2txt(int reason)
2025{
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00002026 switch (reason) {
Ben Lindstrom69128662001-05-08 20:07:39 +00002027 case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED:
2028 return "administratively prohibited";
2029 case SSH2_OPEN_CONNECT_FAILED:
2030 return "connect failed";
2031 case SSH2_OPEN_UNKNOWN_CHANNEL_TYPE:
2032 return "unknown channel type";
2033 case SSH2_OPEN_RESOURCE_SHORTAGE:
2034 return "resource shortage";
2035 }
Ben Lindstrome2595442001-06-05 20:01:39 +00002036 return "unknown reason";
Ben Lindstrom69128662001-05-08 20:07:39 +00002037}
2038
Damien Miller4af51302000-04-16 11:18:38 +10002039void
Damien Miller630d6f42002-01-22 23:17:30 +11002040channel_input_open_failure(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002041{
Kevin Steves12057502001-02-05 14:54:34 +00002042 int id, reason;
2043 char *msg = NULL, *lang = NULL;
Damien Millerb38eff82000-04-01 11:09:21 +10002044 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002045
Damien Millerb38eff82000-04-01 11:09:21 +10002046 id = packet_get_int();
2047 c = channel_lookup(id);
2048
2049 if (c==NULL || c->type != SSH_CHANNEL_OPENING)
2050 packet_disconnect("Received open failure for "
2051 "non-opening channel %d.", id);
Damien Miller33b13562000-04-04 14:38:59 +10002052 if (compat20) {
Kevin Steves12057502001-02-05 14:54:34 +00002053 reason = packet_get_int();
Ben Lindstromf3436742001-04-29 19:52:00 +00002054 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
Kevin Steves12057502001-02-05 14:54:34 +00002055 msg = packet_get_string(NULL);
2056 lang = packet_get_string(NULL);
2057 }
Damien Miller996acd22003-04-09 20:59:48 +10002058 logit("channel %d: open failed: %s%s%s", id,
Ben Lindstrom69128662001-05-08 20:07:39 +00002059 reason2txt(reason), msg ? ": ": "", msg ? msg : "");
Kevin Steves12057502001-02-05 14:54:34 +00002060 if (msg != NULL)
2061 xfree(msg);
2062 if (lang != NULL)
2063 xfree(lang);
Damien Miller33b13562000-04-04 14:38:59 +10002064 }
Damien Miller48b03fc2002-01-22 23:11:40 +11002065 packet_check_eom();
Damien Miller95def091999-11-25 00:26:21 +11002066 /* Free the channel. This will also close the socket. */
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002067 channel_free(c);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002068}
2069
Damien Miller33b13562000-04-04 14:38:59 +10002070void
Damien Miller630d6f42002-01-22 23:17:30 +11002071channel_input_window_adjust(int type, u_int32_t seq, void *ctxt)
Damien Miller33b13562000-04-04 14:38:59 +10002072{
2073 Channel *c;
Ben Lindstrom4fed2be2002-06-25 23:17:36 +00002074 int id;
2075 u_int adjust;
Damien Miller33b13562000-04-04 14:38:59 +10002076
2077 if (!compat20)
2078 return;
2079
2080 /* Get the channel number and verify it. */
2081 id = packet_get_int();
2082 c = channel_lookup(id);
2083
2084 if (c == NULL || c->type != SSH_CHANNEL_OPEN) {
Damien Miller996acd22003-04-09 20:59:48 +10002085 logit("Received window adjust for "
Damien Miller33b13562000-04-04 14:38:59 +10002086 "non-open channel %d.", id);
2087 return;
2088 }
2089 adjust = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11002090 packet_check_eom();
Ben Lindstrom4fed2be2002-06-25 23:17:36 +00002091 debug2("channel %d: rcvd adjust %u", id, adjust);
Damien Miller33b13562000-04-04 14:38:59 +10002092 c->remote_window += adjust;
2093}
2094
Damien Miller4af51302000-04-16 11:18:38 +10002095void
Damien Miller630d6f42002-01-22 23:17:30 +11002096channel_input_port_open(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002097{
Ben Lindstrome9c99912001-06-09 00:41:05 +00002098 Channel *c = NULL;
2099 u_short host_port;
2100 char *host, *originator_string;
2101 int remote_id, sock = -1;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002102
Ben Lindstrome9c99912001-06-09 00:41:05 +00002103 remote_id = packet_get_int();
2104 host = packet_get_string(NULL);
2105 host_port = packet_get_int();
2106
2107 if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) {
2108 originator_string = packet_get_string(NULL);
2109 } else {
2110 originator_string = xstrdup("unknown (remote did not supply name)");
2111 }
Damien Miller48b03fc2002-01-22 23:11:40 +11002112 packet_check_eom();
Ben Lindstrome9c99912001-06-09 00:41:05 +00002113 sock = channel_connect_to(host, host_port);
2114 if (sock != -1) {
2115 c = channel_new("connected socket",
2116 SSH_CHANNEL_CONNECTING, sock, sock, -1, 0, 0, 0,
2117 originator_string, 1);
Damien Miller699d0032002-02-08 22:07:16 +11002118 c->remote_id = remote_id;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002119 }
Damien Millerb1ca8bb2003-05-14 13:45:42 +10002120 xfree(originator_string);
Ben Lindstrome9c99912001-06-09 00:41:05 +00002121 if (c == NULL) {
2122 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
2123 packet_put_int(remote_id);
2124 packet_send();
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002125 }
Ben Lindstrome9c99912001-06-09 00:41:05 +00002126 xfree(host);
Ben Lindstrom5744dc42001-04-13 23:28:01 +00002127}
2128
2129
Ben Lindstrome9c99912001-06-09 00:41:05 +00002130/* -- tcp forwarding */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002131
Ben Lindstrom908afed2001-10-03 17:34:59 +00002132void
2133channel_set_af(int af)
2134{
2135 IPv4or6 = af;
2136}
2137
Damien Millerb16461c2002-01-22 23:29:22 +11002138static int
2139channel_setup_fwd_listener(int type, const char *listen_addr, u_short listen_port,
2140 const char *host_to_connect, u_short port_to_connect, int gateway_ports)
Damien Miller0bc1bd82000-11-13 22:57:25 +11002141{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002142 Channel *c;
Damien Millerb16461c2002-01-22 23:29:22 +11002143 int success, sock, on = 1;
Damien Miller34132e52000-01-14 15:45:46 +11002144 struct addrinfo hints, *ai, *aitop;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002145 const char *host;
Damien Millerb16461c2002-01-22 23:29:22 +11002146 char ntop[NI_MAXHOST], strport[NI_MAXSERV];
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002147
Kevin Steves12057502001-02-05 14:54:34 +00002148 success = 0;
Damien Millerb16461c2002-01-22 23:29:22 +11002149 host = (type == SSH_CHANNEL_RPORT_LISTENER) ?
2150 listen_addr : host_to_connect;
Kevin Steves12057502001-02-05 14:54:34 +00002151
Damien Millerb16461c2002-01-22 23:29:22 +11002152 if (host == NULL) {
2153 error("No forward host name.");
2154 return success;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002155 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002156 if (strlen(host) > SSH_CHANNEL_PATH_LEN - 1) {
Kevin Steves12057502001-02-05 14:54:34 +00002157 error("Forward host name too long.");
2158 return success;
2159 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002160
Damien Miller5428f641999-11-25 11:54:57 +11002161 /*
Damien Miller34132e52000-01-14 15:45:46 +11002162 * getaddrinfo returns a loopback address if the hostname is
2163 * set to NULL and hints.ai_flags is not AI_PASSIVE
Damien Miller5428f641999-11-25 11:54:57 +11002164 */
Damien Miller34132e52000-01-14 15:45:46 +11002165 memset(&hints, 0, sizeof(hints));
2166 hints.ai_family = IPv4or6;
2167 hints.ai_flags = gateway_ports ? AI_PASSIVE : 0;
2168 hints.ai_socktype = SOCK_STREAM;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002169 snprintf(strport, sizeof strport, "%d", listen_port);
Damien Miller34132e52000-01-14 15:45:46 +11002170 if (getaddrinfo(NULL, strport, &hints, &aitop) != 0)
2171 packet_disconnect("getaddrinfo: fatal error");
Damien Miller5428f641999-11-25 11:54:57 +11002172
Damien Miller34132e52000-01-14 15:45:46 +11002173 for (ai = aitop; ai; ai = ai->ai_next) {
2174 if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
2175 continue;
2176 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop),
2177 strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
Damien Millerb16461c2002-01-22 23:29:22 +11002178 error("channel_setup_fwd_listener: getnameinfo failed");
Damien Miller34132e52000-01-14 15:45:46 +11002179 continue;
2180 }
2181 /* Create a port to listen for the host. */
Damien Miller2372ace2003-05-14 13:42:23 +10002182 sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
Damien Miller34132e52000-01-14 15:45:46 +11002183 if (sock < 0) {
2184 /* this is no error since kernel may not support ipv6 */
2185 verbose("socket: %.100s", strerror(errno));
2186 continue;
2187 }
2188 /*
Damien Millere1383ce2002-09-19 11:49:37 +10002189 * Set socket options.
2190 * Allow local port reuse in TIME_WAIT.
Damien Miller34132e52000-01-14 15:45:46 +11002191 */
Damien Millere1383ce2002-09-19 11:49:37 +10002192 if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &on,
2193 sizeof(on)) == -1)
2194 error("setsockopt SO_REUSEADDR: %s", strerror(errno));
2195
Damien Miller34132e52000-01-14 15:45:46 +11002196 debug("Local forwarding listening on %s port %s.", ntop, strport);
Damien Miller95def091999-11-25 00:26:21 +11002197
Damien Miller34132e52000-01-14 15:45:46 +11002198 /* Bind the socket to the address. */
2199 if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
2200 /* address can be in use ipv6 address is already bound */
Damien Miller3c7eeb22000-03-03 22:35:33 +11002201 if (!ai->ai_next)
2202 error("bind: %.100s", strerror(errno));
2203 else
2204 verbose("bind: %.100s", strerror(errno));
Kevin Stevesef4eea92001-02-05 12:42:17 +00002205
Damien Miller34132e52000-01-14 15:45:46 +11002206 close(sock);
2207 continue;
2208 }
2209 /* Start listening for connections on the socket. */
Darren Tucker3175eb92003-12-09 19:15:11 +11002210 if (listen(sock, SSH_LISTEN_BACKLOG) < 0) {
Damien Miller34132e52000-01-14 15:45:46 +11002211 error("listen: %.100s", strerror(errno));
2212 close(sock);
2213 continue;
2214 }
2215 /* Allocate a channel number for the socket. */
Ben Lindstrome9c99912001-06-09 00:41:05 +00002216 c = channel_new("port listener", type, sock, sock, -1,
Damien Millerbd483e72000-04-30 10:00:53 +10002217 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10002218 0, "port listener", 1);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002219 strlcpy(c->path, host, sizeof(c->path));
2220 c->host_port = port_to_connect;
2221 c->listening_port = listen_port;
Damien Miller34132e52000-01-14 15:45:46 +11002222 success = 1;
2223 }
2224 if (success == 0)
Damien Millerb16461c2002-01-22 23:29:22 +11002225 error("channel_setup_fwd_listener: cannot listen to port: %d",
Kevin Steves12057502001-02-05 14:54:34 +00002226 listen_port);
Damien Miller34132e52000-01-14 15:45:46 +11002227 freeaddrinfo(aitop);
Kevin Steves12057502001-02-05 14:54:34 +00002228 return success;
Damien Miller95def091999-11-25 00:26:21 +11002229}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002230
Damien Millerb16461c2002-01-22 23:29:22 +11002231/* protocol local port fwd, used by ssh (and sshd in v1) */
2232int
2233channel_setup_local_fwd_listener(u_short listen_port,
2234 const char *host_to_connect, u_short port_to_connect, int gateway_ports)
2235{
2236 return channel_setup_fwd_listener(SSH_CHANNEL_PORT_LISTENER,
2237 NULL, listen_port, host_to_connect, port_to_connect, gateway_ports);
2238}
2239
2240/* protocol v2 remote port fwd, used by sshd */
2241int
2242channel_setup_remote_fwd_listener(const char *listen_address,
2243 u_short listen_port, int gateway_ports)
2244{
2245 return channel_setup_fwd_listener(SSH_CHANNEL_RPORT_LISTENER,
2246 listen_address, listen_port, NULL, 0, gateway_ports);
2247}
2248
Damien Miller5428f641999-11-25 11:54:57 +11002249/*
2250 * Initiate forwarding of connections to port "port" on remote host through
2251 * the secure channel to host:port from local side.
2252 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002253
Damien Miller4af51302000-04-16 11:18:38 +10002254void
Damien Miller0bc1bd82000-11-13 22:57:25 +11002255channel_request_remote_forwarding(u_short listen_port,
2256 const char *host_to_connect, u_short port_to_connect)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002257{
Damien Millerdff50992002-01-22 23:16:32 +11002258 int type, success = 0;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002259
Damien Miller95def091999-11-25 00:26:21 +11002260 /* Record locally that connection to this host/port is permitted. */
2261 if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION)
2262 fatal("channel_request_remote_forwarding: too many forwards");
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002263
Damien Miller95def091999-11-25 00:26:21 +11002264 /* Send the forward request to the remote side. */
Damien Miller33b13562000-04-04 14:38:59 +10002265 if (compat20) {
2266 const char *address_to_bind = "0.0.0.0";
2267 packet_start(SSH2_MSG_GLOBAL_REQUEST);
2268 packet_put_cstring("tcpip-forward");
Damien Miller2797f7f2002-04-23 21:09:44 +10002269 packet_put_char(1); /* boolean: want reply */
Damien Miller33b13562000-04-04 14:38:59 +10002270 packet_put_cstring(address_to_bind);
2271 packet_put_int(listen_port);
Damien Miller0bc1bd82000-11-13 22:57:25 +11002272 packet_send();
2273 packet_write_wait();
2274 /* Assume that server accepts the request */
2275 success = 1;
Damien Miller33b13562000-04-04 14:38:59 +10002276 } else {
2277 packet_start(SSH_CMSG_PORT_FORWARD_REQUEST);
Damien Miller33b13562000-04-04 14:38:59 +10002278 packet_put_int(listen_port);
Damien Miller8bb73be2000-04-19 16:26:12 +10002279 packet_put_cstring(host_to_connect);
2280 packet_put_int(port_to_connect);
Damien Miller33b13562000-04-04 14:38:59 +10002281 packet_send();
2282 packet_write_wait();
Damien Miller0bc1bd82000-11-13 22:57:25 +11002283
2284 /* Wait for response from the remote side. */
Damien Millerdff50992002-01-22 23:16:32 +11002285 type = packet_read();
Damien Miller0bc1bd82000-11-13 22:57:25 +11002286 switch (type) {
2287 case SSH_SMSG_SUCCESS:
2288 success = 1;
2289 break;
2290 case SSH_SMSG_FAILURE:
Damien Miller996acd22003-04-09 20:59:48 +10002291 logit("Warning: Server denied remote port forwarding.");
Damien Miller0bc1bd82000-11-13 22:57:25 +11002292 break;
2293 default:
2294 /* Unknown packet */
2295 packet_disconnect("Protocol error for port forward request:"
2296 "received packet type %d.", type);
2297 }
2298 }
2299 if (success) {
2300 permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host_to_connect);
2301 permitted_opens[num_permitted_opens].port_to_connect = port_to_connect;
2302 permitted_opens[num_permitted_opens].listen_port = listen_port;
2303 num_permitted_opens++;
Damien Miller33b13562000-04-04 14:38:59 +10002304 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002305}
2306
Damien Miller5428f641999-11-25 11:54:57 +11002307/*
2308 * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates
2309 * listening for the port, and sends back a success reply (or disconnect
2310 * message if there was an error). This never returns if there was an error.
2311 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002312
Damien Miller4af51302000-04-16 11:18:38 +10002313void
Damien Millere247cc42000-05-07 12:03:14 +10002314channel_input_port_forward_request(int is_root, int gateway_ports)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002315{
Damien Milleraae6c611999-12-06 11:47:28 +11002316 u_short port, host_port;
Damien Miller95def091999-11-25 00:26:21 +11002317 char *hostname;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002318
Damien Miller95def091999-11-25 00:26:21 +11002319 /* Get arguments from the packet. */
2320 port = packet_get_int();
2321 hostname = packet_get_string(NULL);
2322 host_port = packet_get_int();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002323
Damien Millerbac2d8a2000-09-05 16:13:06 +11002324#ifndef HAVE_CYGWIN
Damien Miller5428f641999-11-25 11:54:57 +11002325 /*
2326 * Check that an unprivileged user is not trying to forward a
2327 * privileged port.
2328 */
Damien Miller95def091999-11-25 00:26:21 +11002329 if (port < IPPORT_RESERVED && !is_root)
Darren Tucker9189ff82003-07-03 13:52:04 +10002330 packet_disconnect(
2331 "Requested forwarding of port %d but user is not root.",
2332 port);
2333 if (host_port == 0)
2334 packet_disconnect("Dynamic forwarding denied.");
Damien Millerbac2d8a2000-09-05 16:13:06 +11002335#endif
Darren Tucker9189ff82003-07-03 13:52:04 +10002336
Damien Miller0bc1bd82000-11-13 22:57:25 +11002337 /* Initiate forwarding */
Damien Millerb16461c2002-01-22 23:29:22 +11002338 channel_setup_local_fwd_listener(port, hostname, host_port, gateway_ports);
Damien Miller95def091999-11-25 00:26:21 +11002339
2340 /* Free the argument string. */
2341 xfree(hostname);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002342}
2343
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002344/*
2345 * Permits opening to any host/port if permitted_opens[] is empty. This is
2346 * usually called by the server, because the user could connect to any port
2347 * anyway, and the server has no way to know but to trust the client anyway.
2348 */
2349void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00002350channel_permit_all_opens(void)
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002351{
2352 if (num_permitted_opens == 0)
2353 all_opens_permitted = 1;
2354}
2355
Ben Lindstroma3700052001-04-05 23:26:32 +00002356void
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002357channel_add_permitted_opens(char *host, int port)
2358{
2359 if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION)
2360 fatal("channel_request_remote_forwarding: too many forwards");
2361 debug("allow port forwarding to host %s port %d", host, port);
2362
2363 permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host);
2364 permitted_opens[num_permitted_opens].port_to_connect = port;
2365 num_permitted_opens++;
2366
2367 all_opens_permitted = 0;
2368}
2369
Ben Lindstroma3700052001-04-05 23:26:32 +00002370void
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002371channel_clear_permitted_opens(void)
2372{
2373 int i;
2374
2375 for (i = 0; i < num_permitted_opens; i++)
2376 xfree(permitted_opens[i].host_to_connect);
2377 num_permitted_opens = 0;
2378
2379}
2380
2381
2382/* return socket to remote host, port */
Ben Lindstrombba81212001-06-25 05:01:22 +00002383static int
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002384connect_to(const char *host, u_short port)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002385{
Damien Miller34132e52000-01-14 15:45:46 +11002386 struct addrinfo hints, *ai, *aitop;
2387 char ntop[NI_MAXHOST], strport[NI_MAXSERV];
2388 int gaierr;
Damien Millerb38eff82000-04-01 11:09:21 +10002389 int sock = -1;
Damien Miller95def091999-11-25 00:26:21 +11002390
Damien Miller34132e52000-01-14 15:45:46 +11002391 memset(&hints, 0, sizeof(hints));
2392 hints.ai_family = IPv4or6;
2393 hints.ai_socktype = SOCK_STREAM;
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002394 snprintf(strport, sizeof strport, "%d", port);
Damien Miller34132e52000-01-14 15:45:46 +11002395 if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) {
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002396 error("connect_to %.100s: unknown host (%s)", host,
2397 gai_strerror(gaierr));
Damien Millerb38eff82000-04-01 11:09:21 +10002398 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002399 }
Damien Miller34132e52000-01-14 15:45:46 +11002400 for (ai = aitop; ai; ai = ai->ai_next) {
2401 if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
2402 continue;
2403 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop),
2404 strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002405 error("connect_to: getnameinfo failed");
Damien Miller34132e52000-01-14 15:45:46 +11002406 continue;
2407 }
Damien Miller2372ace2003-05-14 13:42:23 +10002408 sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
Damien Miller34132e52000-01-14 15:45:46 +11002409 if (sock < 0) {
Damien Millerb46b9f32003-01-10 21:45:12 +11002410 if (ai->ai_next == NULL)
2411 error("socket: %.100s", strerror(errno));
2412 else
2413 verbose("socket: %.100s", strerror(errno));
Damien Miller34132e52000-01-14 15:45:46 +11002414 continue;
2415 }
Ben Lindstrom48bd7c12001-01-09 00:35:42 +00002416 if (fcntl(sock, F_SETFL, O_NONBLOCK) < 0)
Ben Lindstrom7ad97102000-12-06 01:42:49 +00002417 fatal("connect_to: F_SETFL: %s", strerror(errno));
Ben Lindstrom7ad97102000-12-06 01:42:49 +00002418 if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0 &&
2419 errno != EINPROGRESS) {
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002420 error("connect_to %.100s port %s: %.100s", ntop, strport,
Damien Miller34132e52000-01-14 15:45:46 +11002421 strerror(errno));
2422 close(sock);
Kevin Stevesef4eea92001-02-05 12:42:17 +00002423 continue; /* fail -- try next */
Damien Miller34132e52000-01-14 15:45:46 +11002424 }
2425 break; /* success */
2426
2427 }
2428 freeaddrinfo(aitop);
Damien Miller34132e52000-01-14 15:45:46 +11002429 if (!ai) {
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002430 error("connect_to %.100s port %d: failed.", host, port);
Damien Millerb38eff82000-04-01 11:09:21 +10002431 return -1;
2432 }
2433 /* success */
Ben Lindstrom1ebd7a52002-02-26 18:12:51 +00002434 set_nodelay(sock);
Damien Millerb38eff82000-04-01 11:09:21 +10002435 return sock;
2436}
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002437
Damien Miller0bc1bd82000-11-13 22:57:25 +11002438int
Ben Lindstrom173e6462001-07-04 05:15:15 +00002439channel_connect_by_listen_address(u_short listen_port)
Damien Miller0bc1bd82000-11-13 22:57:25 +11002440{
2441 int i;
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002442
Damien Miller0bc1bd82000-11-13 22:57:25 +11002443 for (i = 0; i < num_permitted_opens; i++)
2444 if (permitted_opens[i].listen_port == listen_port)
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002445 return connect_to(
Damien Miller0bc1bd82000-11-13 22:57:25 +11002446 permitted_opens[i].host_to_connect,
2447 permitted_opens[i].port_to_connect);
Ben Lindstromc72745a2000-12-02 19:03:54 +00002448 error("WARNING: Server requests forwarding for unknown listen_port %d",
2449 listen_port);
Damien Miller0bc1bd82000-11-13 22:57:25 +11002450 return -1;
2451}
Damien Millerb38eff82000-04-01 11:09:21 +10002452
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002453/* Check if connecting to that port is permitted and connect. */
2454int
2455channel_connect_to(const char *host, u_short port)
2456{
2457 int i, permit;
2458
2459 permit = all_opens_permitted;
2460 if (!permit) {
2461 for (i = 0; i < num_permitted_opens; i++)
2462 if (permitted_opens[i].port_to_connect == port &&
2463 strcmp(permitted_opens[i].host_to_connect, host) == 0)
2464 permit = 1;
2465
2466 }
2467 if (!permit) {
Damien Miller996acd22003-04-09 20:59:48 +10002468 logit("Received request to connect to host %.100s port %d, "
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002469 "but the request was denied.", host, port);
2470 return -1;
2471 }
2472 return connect_to(host, port);
2473}
2474
Ben Lindstrome9c99912001-06-09 00:41:05 +00002475/* -- X11 forwarding */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002476
Damien Miller5428f641999-11-25 11:54:57 +11002477/*
2478 * Creates an internet domain socket for listening for X11 connections.
Ben Lindstroma9d2c892002-06-23 21:48:28 +00002479 * Returns 0 and a suitable display number for the DISPLAY variable
2480 * stored in display_numberp , or -1 if an error occurs.
Damien Miller5428f641999-11-25 11:54:57 +11002481 */
Kevin Steves366298c2001-12-19 17:58:01 +00002482int
Damien Miller95c249f2002-02-05 12:11:34 +11002483x11_create_display_inet(int x11_display_offset, int x11_use_localhost,
Ben Lindstroma9d2c892002-06-23 21:48:28 +00002484 int single_connection, u_int *display_numberp)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002485{
Damien Millere7378562001-12-21 14:58:35 +11002486 Channel *nc = NULL;
Damien Milleraae6c611999-12-06 11:47:28 +11002487 int display_number, sock;
2488 u_short port;
Damien Miller34132e52000-01-14 15:45:46 +11002489 struct addrinfo hints, *ai, *aitop;
2490 char strport[NI_MAXSERV];
2491 int gaierr, n, num_socks = 0, socks[NUM_SOCKS];
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002492
Damien Millera34a28b1999-12-14 10:47:15 +11002493 for (display_number = x11_display_offset;
Damien Miller9f0f5c62001-12-21 14:45:46 +11002494 display_number < MAX_DISPLAYS;
2495 display_number++) {
Damien Miller95def091999-11-25 00:26:21 +11002496 port = 6000 + display_number;
Damien Miller34132e52000-01-14 15:45:46 +11002497 memset(&hints, 0, sizeof(hints));
2498 hints.ai_family = IPv4or6;
Damien Miller95c249f2002-02-05 12:11:34 +11002499 hints.ai_flags = x11_use_localhost ? 0: AI_PASSIVE;
Damien Miller34132e52000-01-14 15:45:46 +11002500 hints.ai_socktype = SOCK_STREAM;
2501 snprintf(strport, sizeof strport, "%d", port);
2502 if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) {
2503 error("getaddrinfo: %.100s", gai_strerror(gaierr));
Kevin Steves366298c2001-12-19 17:58:01 +00002504 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002505 }
Damien Miller34132e52000-01-14 15:45:46 +11002506 for (ai = aitop; ai; ai = ai->ai_next) {
2507 if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
2508 continue;
Damien Miller2372ace2003-05-14 13:42:23 +10002509 sock = socket(ai->ai_family, ai->ai_socktype,
2510 ai->ai_protocol);
Damien Miller34132e52000-01-14 15:45:46 +11002511 if (sock < 0) {
Damien Miller89d97962000-10-14 12:37:19 +11002512 if ((errno != EINVAL) && (errno != EAFNOSUPPORT)) {
Damien Millere2192732000-01-17 13:22:55 +11002513 error("socket: %.100s", strerror(errno));
Kevin Steves366298c2001-12-19 17:58:01 +00002514 return -1;
Damien Millere2192732000-01-17 13:22:55 +11002515 } else {
Damien Millercb5e44a2000-09-29 12:12:36 +11002516 debug("x11_create_display_inet: Socket family %d not supported",
2517 ai->ai_family);
Damien Millere2192732000-01-17 13:22:55 +11002518 continue;
2519 }
Damien Miller34132e52000-01-14 15:45:46 +11002520 }
Kevin Stevesdf75dd22002-06-04 20:52:19 +00002521#ifdef IPV6_V6ONLY
2522 if (ai->ai_family == AF_INET6) {
2523 int on = 1;
2524 if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) < 0)
2525 error("setsockopt IPV6_V6ONLY: %.100s", strerror(errno));
2526 }
2527#endif
Damien Miller34132e52000-01-14 15:45:46 +11002528 if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +10002529 debug2("bind port %d: %.100s", port, strerror(errno));
Damien Miller34132e52000-01-14 15:45:46 +11002530 close(sock);
Damien Miller3c7eeb22000-03-03 22:35:33 +11002531
2532 if (ai->ai_next)
2533 continue;
2534
Damien Miller34132e52000-01-14 15:45:46 +11002535 for (n = 0; n < num_socks; n++) {
Damien Miller34132e52000-01-14 15:45:46 +11002536 close(socks[n]);
2537 }
2538 num_socks = 0;
2539 break;
2540 }
2541 socks[num_socks++] = sock;
Damien Miller7bcb0892000-03-11 20:45:40 +11002542#ifndef DONT_TRY_OTHER_AF
Damien Miller34132e52000-01-14 15:45:46 +11002543 if (num_socks == NUM_SOCKS)
2544 break;
Damien Miller7bcb0892000-03-11 20:45:40 +11002545#else
Kevin Stevesdf75dd22002-06-04 20:52:19 +00002546 if (x11_use_localhost) {
2547 if (num_socks == NUM_SOCKS)
2548 break;
2549 } else {
2550 break;
2551 }
Damien Miller7bcb0892000-03-11 20:45:40 +11002552#endif
Damien Miller95def091999-11-25 00:26:21 +11002553 }
Ben Lindstrom87b147f2001-01-25 00:41:12 +00002554 freeaddrinfo(aitop);
Damien Miller34132e52000-01-14 15:45:46 +11002555 if (num_socks > 0)
2556 break;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002557 }
Damien Miller95def091999-11-25 00:26:21 +11002558 if (display_number >= MAX_DISPLAYS) {
2559 error("Failed to allocate internet-domain X11 display socket.");
Kevin Steves366298c2001-12-19 17:58:01 +00002560 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002561 }
Damien Miller95def091999-11-25 00:26:21 +11002562 /* Start listening for connections on the socket. */
Damien Miller34132e52000-01-14 15:45:46 +11002563 for (n = 0; n < num_socks; n++) {
2564 sock = socks[n];
Darren Tucker3175eb92003-12-09 19:15:11 +11002565 if (listen(sock, SSH_LISTEN_BACKLOG) < 0) {
Damien Miller34132e52000-01-14 15:45:46 +11002566 error("listen: %.100s", strerror(errno));
Damien Miller34132e52000-01-14 15:45:46 +11002567 close(sock);
Kevin Steves366298c2001-12-19 17:58:01 +00002568 return -1;
Damien Miller34132e52000-01-14 15:45:46 +11002569 }
Damien Miller95def091999-11-25 00:26:21 +11002570 }
Damien Miller34132e52000-01-14 15:45:46 +11002571
Damien Miller34132e52000-01-14 15:45:46 +11002572 /* Allocate a channel for each socket. */
2573 for (n = 0; n < num_socks; n++) {
2574 sock = socks[n];
Damien Millere7378562001-12-21 14:58:35 +11002575 nc = channel_new("x11 listener",
Damien Millerbd483e72000-04-30 10:00:53 +10002576 SSH_CHANNEL_X11_LISTENER, sock, sock, -1,
2577 CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10002578 0, "X11 inet listener", 1);
Damien Miller699d0032002-02-08 22:07:16 +11002579 nc->single_connection = single_connection;
Damien Miller34132e52000-01-14 15:45:46 +11002580 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002581
Kevin Steves366298c2001-12-19 17:58:01 +00002582 /* Return the display number for the DISPLAY environment variable. */
Ben Lindstroma9d2c892002-06-23 21:48:28 +00002583 *display_numberp = display_number;
2584 return (0);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002585}
2586
Ben Lindstrombba81212001-06-25 05:01:22 +00002587static int
Ben Lindstrom46c16222000-12-22 01:43:59 +00002588connect_local_xsocket(u_int dnr)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002589{
Damien Miller95def091999-11-25 00:26:21 +11002590 int sock;
2591 struct sockaddr_un addr;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002592
Damien Miller3afe3752001-12-21 12:39:51 +11002593 sock = socket(AF_UNIX, SOCK_STREAM, 0);
2594 if (sock < 0)
2595 error("socket: %.100s", strerror(errno));
2596 memset(&addr, 0, sizeof(addr));
2597 addr.sun_family = AF_UNIX;
2598 snprintf(addr.sun_path, sizeof addr.sun_path, _PATH_UNIX_X, dnr);
2599 if (connect(sock, (struct sockaddr *) & addr, sizeof(addr)) == 0)
2600 return sock;
2601 close(sock);
Damien Miller95def091999-11-25 00:26:21 +11002602 error("connect %.100s: %.100s", addr.sun_path, strerror(errno));
2603 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002604}
2605
Damien Millerbd483e72000-04-30 10:00:53 +10002606int
2607x11_connect_display(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002608{
Damien Miller398e1cf2002-02-05 11:52:13 +11002609 int display_number, sock = 0;
Damien Miller95def091999-11-25 00:26:21 +11002610 const char *display;
Damien Millerbd483e72000-04-30 10:00:53 +10002611 char buf[1024], *cp;
Damien Miller34132e52000-01-14 15:45:46 +11002612 struct addrinfo hints, *ai, *aitop;
2613 char strport[NI_MAXSERV];
2614 int gaierr;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002615
Damien Miller95def091999-11-25 00:26:21 +11002616 /* Try to open a socket for the local X server. */
2617 display = getenv("DISPLAY");
2618 if (!display) {
2619 error("DISPLAY not set.");
Damien Millerbd483e72000-04-30 10:00:53 +10002620 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002621 }
Damien Miller5428f641999-11-25 11:54:57 +11002622 /*
2623 * Now we decode the value of the DISPLAY variable and make a
2624 * connection to the real X server.
2625 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002626
Damien Miller5428f641999-11-25 11:54:57 +11002627 /*
2628 * Check if it is a unix domain socket. Unix domain displays are in
2629 * one of the following formats: unix:d[.s], :d[.s], ::d[.s]
2630 */
Damien Miller95def091999-11-25 00:26:21 +11002631 if (strncmp(display, "unix:", 5) == 0 ||
2632 display[0] == ':') {
2633 /* Connect to the unix domain socket. */
2634 if (sscanf(strrchr(display, ':') + 1, "%d", &display_number) != 1) {
2635 error("Could not parse display number from DISPLAY: %.100s",
Damien Miller9f0f5c62001-12-21 14:45:46 +11002636 display);
Damien Millerbd483e72000-04-30 10:00:53 +10002637 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002638 }
2639 /* Create a socket. */
2640 sock = connect_local_xsocket(display_number);
2641 if (sock < 0)
Damien Millerbd483e72000-04-30 10:00:53 +10002642 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002643
2644 /* OK, we now have a connection to the display. */
Damien Millerbd483e72000-04-30 10:00:53 +10002645 return sock;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002646 }
Damien Miller5428f641999-11-25 11:54:57 +11002647 /*
2648 * Connect to an inet socket. The DISPLAY value is supposedly
2649 * hostname:d[.s], where hostname may also be numeric IP address.
2650 */
Ben Lindstromccd8d072001-12-07 17:26:48 +00002651 strlcpy(buf, display, sizeof(buf));
Damien Miller95def091999-11-25 00:26:21 +11002652 cp = strchr(buf, ':');
2653 if (!cp) {
2654 error("Could not find ':' in DISPLAY: %.100s", display);
Damien Millerbd483e72000-04-30 10:00:53 +10002655 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002656 }
Damien Miller95def091999-11-25 00:26:21 +11002657 *cp = 0;
Damien Miller5428f641999-11-25 11:54:57 +11002658 /* buf now contains the host name. But first we parse the display number. */
Damien Miller95def091999-11-25 00:26:21 +11002659 if (sscanf(cp + 1, "%d", &display_number) != 1) {
2660 error("Could not parse display number from DISPLAY: %.100s",
Damien Miller9f0f5c62001-12-21 14:45:46 +11002661 display);
Damien Millerbd483e72000-04-30 10:00:53 +10002662 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002663 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002664
Damien Miller34132e52000-01-14 15:45:46 +11002665 /* Look up the host address */
2666 memset(&hints, 0, sizeof(hints));
2667 hints.ai_family = IPv4or6;
2668 hints.ai_socktype = SOCK_STREAM;
2669 snprintf(strport, sizeof strport, "%d", 6000 + display_number);
2670 if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) {
2671 error("%.100s: unknown host. (%s)", buf, gai_strerror(gaierr));
Damien Millerbd483e72000-04-30 10:00:53 +10002672 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002673 }
Damien Miller34132e52000-01-14 15:45:46 +11002674 for (ai = aitop; ai; ai = ai->ai_next) {
2675 /* Create a socket. */
Damien Miller2372ace2003-05-14 13:42:23 +10002676 sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
Damien Miller34132e52000-01-14 15:45:46 +11002677 if (sock < 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +10002678 debug2("socket: %.100s", strerror(errno));
Damien Millerb38eff82000-04-01 11:09:21 +10002679 continue;
2680 }
2681 /* Connect it to the display. */
2682 if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +10002683 debug2("connect %.100s port %d: %.100s", buf,
Damien Millerb38eff82000-04-01 11:09:21 +10002684 6000 + display_number, strerror(errno));
2685 close(sock);
2686 continue;
2687 }
2688 /* Success */
2689 break;
Damien Miller34132e52000-01-14 15:45:46 +11002690 }
Damien Miller34132e52000-01-14 15:45:46 +11002691 freeaddrinfo(aitop);
2692 if (!ai) {
Damien Miller4af51302000-04-16 11:18:38 +10002693 error("connect %.100s port %d: %.100s", buf, 6000 + display_number,
Damien Miller34132e52000-01-14 15:45:46 +11002694 strerror(errno));
Damien Millerbd483e72000-04-30 10:00:53 +10002695 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002696 }
Damien Miller398e1cf2002-02-05 11:52:13 +11002697 set_nodelay(sock);
Damien Millerbd483e72000-04-30 10:00:53 +10002698 return sock;
2699}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002700
Damien Millerbd483e72000-04-30 10:00:53 +10002701/*
2702 * This is called when SSH_SMSG_X11_OPEN is received. The packet contains
2703 * the remote channel number. We should do whatever we want, and respond
2704 * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE.
2705 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002706
Damien Millerbd483e72000-04-30 10:00:53 +10002707void
Damien Miller630d6f42002-01-22 23:17:30 +11002708x11_input_open(int type, u_int32_t seq, void *ctxt)
Damien Millerbd483e72000-04-30 10:00:53 +10002709{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002710 Channel *c = NULL;
2711 int remote_id, sock = 0;
Damien Millerbd483e72000-04-30 10:00:53 +10002712 char *remote_host;
Damien Millerbd483e72000-04-30 10:00:53 +10002713
2714 debug("Received X11 open request.");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002715
2716 remote_id = packet_get_int();
Ben Lindstrome9c99912001-06-09 00:41:05 +00002717
2718 if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002719 remote_host = packet_get_string(NULL);
2720 } else {
2721 remote_host = xstrdup("unknown (remote did not supply name)");
2722 }
Damien Miller48b03fc2002-01-22 23:11:40 +11002723 packet_check_eom();
Damien Millerbd483e72000-04-30 10:00:53 +10002724
2725 /* Obtain a connection to the real X display. */
2726 sock = x11_connect_display();
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002727 if (sock != -1) {
2728 /* Allocate a channel for this connection. */
2729 c = channel_new("connected x11 socket",
2730 SSH_CHANNEL_X11_OPEN, sock, sock, -1, 0, 0, 0,
2731 remote_host, 1);
Damien Miller699d0032002-02-08 22:07:16 +11002732 c->remote_id = remote_id;
2733 c->force_drain = 1;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002734 }
Damien Millerb1ca8bb2003-05-14 13:45:42 +10002735 xfree(remote_host);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002736 if (c == NULL) {
Damien Millerbd483e72000-04-30 10:00:53 +10002737 /* Send refusal to the remote host. */
2738 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002739 packet_put_int(remote_id);
Damien Millerbd483e72000-04-30 10:00:53 +10002740 } else {
Damien Millerbd483e72000-04-30 10:00:53 +10002741 /* Send a confirmation to the remote host. */
2742 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002743 packet_put_int(remote_id);
2744 packet_put_int(c->self);
Damien Millerbd483e72000-04-30 10:00:53 +10002745 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002746 packet_send();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002747}
2748
Damien Miller69b69aa2000-10-28 14:19:58 +11002749/* dummy protocol handler that denies SSH-1 requests (agent/x11) */
2750void
Damien Miller630d6f42002-01-22 23:17:30 +11002751deny_input_open(int type, u_int32_t seq, void *ctxt)
Damien Miller69b69aa2000-10-28 14:19:58 +11002752{
2753 int rchan = packet_get_int();
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +00002754
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00002755 switch (type) {
Damien Miller69b69aa2000-10-28 14:19:58 +11002756 case SSH_SMSG_AGENT_OPEN:
2757 error("Warning: ssh server tried agent forwarding.");
2758 break;
2759 case SSH_SMSG_X11_OPEN:
2760 error("Warning: ssh server tried X11 forwarding.");
2761 break;
2762 default:
Damien Miller630d6f42002-01-22 23:17:30 +11002763 error("deny_input_open: type %d", type);
Damien Miller69b69aa2000-10-28 14:19:58 +11002764 break;
2765 }
2766 error("Warning: this is probably a break in attempt by a malicious server.");
2767 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
2768 packet_put_int(rchan);
2769 packet_send();
2770}
2771
Damien Miller5428f641999-11-25 11:54:57 +11002772/*
2773 * Requests forwarding of X11 connections, generates fake authentication
2774 * data, and enables authentication spoofing.
Ben Lindstrome9c99912001-06-09 00:41:05 +00002775 * This should be called in the client only.
Damien Miller5428f641999-11-25 11:54:57 +11002776 */
Damien Miller4af51302000-04-16 11:18:38 +10002777void
Damien Millerbd483e72000-04-30 10:00:53 +10002778x11_request_forwarding_with_spoofing(int client_session_id,
2779 const char *proto, const char *data)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002780{
Ben Lindstrom46c16222000-12-22 01:43:59 +00002781 u_int data_len = (u_int) strlen(data) / 2;
Ben Lindstromb3211a82001-02-10 22:33:19 +00002782 u_int i, value, len;
Damien Miller95def091999-11-25 00:26:21 +11002783 char *new_data;
2784 int screen_number;
2785 const char *cp;
2786 u_int32_t rand = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002787
Damien Miller95def091999-11-25 00:26:21 +11002788 cp = getenv("DISPLAY");
2789 if (cp)
2790 cp = strchr(cp, ':');
2791 if (cp)
2792 cp = strchr(cp, '.');
2793 if (cp)
2794 screen_number = atoi(cp + 1);
2795 else
2796 screen_number = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002797
Damien Miller95def091999-11-25 00:26:21 +11002798 /* Save protocol name. */
2799 x11_saved_proto = xstrdup(proto);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002800
Damien Miller5428f641999-11-25 11:54:57 +11002801 /*
2802 * Extract real authentication data and generate fake data of the
2803 * same length.
2804 */
Damien Miller95def091999-11-25 00:26:21 +11002805 x11_saved_data = xmalloc(data_len);
2806 x11_fake_data = xmalloc(data_len);
2807 for (i = 0; i < data_len; i++) {
2808 if (sscanf(data + 2 * i, "%2x", &value) != 1)
2809 fatal("x11_request_forwarding: bad authentication data: %.100s", data);
2810 if (i % 4 == 0)
2811 rand = arc4random();
2812 x11_saved_data[i] = value;
2813 x11_fake_data[i] = rand & 0xff;
2814 rand >>= 8;
2815 }
2816 x11_saved_data_len = data_len;
2817 x11_fake_data_len = data_len;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002818
Damien Miller95def091999-11-25 00:26:21 +11002819 /* Convert the fake data into hex. */
Ben Lindstromb3211a82001-02-10 22:33:19 +00002820 len = 2 * data_len + 1;
2821 new_data = xmalloc(len);
Damien Miller95def091999-11-25 00:26:21 +11002822 for (i = 0; i < data_len; i++)
Ben Lindstromb3211a82001-02-10 22:33:19 +00002823 snprintf(new_data + 2 * i, len - 2 * i,
2824 "%02x", (u_char) x11_fake_data[i]);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002825
Damien Miller95def091999-11-25 00:26:21 +11002826 /* Send the request packet. */
Damien Millerbd483e72000-04-30 10:00:53 +10002827 if (compat20) {
2828 channel_request_start(client_session_id, "x11-req", 0);
2829 packet_put_char(0); /* XXX bool single connection */
2830 } else {
2831 packet_start(SSH_CMSG_X11_REQUEST_FORWARDING);
2832 }
2833 packet_put_cstring(proto);
2834 packet_put_cstring(new_data);
Damien Miller95def091999-11-25 00:26:21 +11002835 packet_put_int(screen_number);
2836 packet_send();
2837 packet_write_wait();
2838 xfree(new_data);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002839}
2840
Ben Lindstrome9c99912001-06-09 00:41:05 +00002841
2842/* -- agent forwarding */
2843
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002844/* Sends a message to the server to request authentication fd forwarding. */
2845
Damien Miller4af51302000-04-16 11:18:38 +10002846void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00002847auth_request_forwarding(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002848{
Damien Miller95def091999-11-25 00:26:21 +11002849 packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING);
2850 packet_send();
2851 packet_write_wait();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002852}