blob: 8c7b2b369000a3c806b8adb77b8dfd374c1556f6 [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 Miller0dc1bef2005-07-17 17:22:45 +100042RCSID("$OpenBSD: channels.c,v 1.223 2005/07/17 07:17:54 djm 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
Darren Tucker11327cc2005-03-14 23:22:25 +110061#define CHAN_RBUF 16*1024
62
Damien Miller5428f641999-11-25 11:54:57 +110063/*
64 * Pointer to an array containing all allocated channels. The array is
65 * dynamically extended as needed.
66 */
Ben Lindstrom99c73b32001-05-05 04:09:47 +000067static Channel **channels = NULL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100068
Damien Miller5428f641999-11-25 11:54:57 +110069/*
70 * Size of the channel array. All slots of the array must always be
Ben Lindstrom99c73b32001-05-05 04:09:47 +000071 * initialized (at least the type field); unused slots set to NULL
Damien Miller5428f641999-11-25 11:54:57 +110072 */
Darren Tuckerc7a6fc42004-08-13 21:18:00 +100073static u_int channels_alloc = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100074
Damien Miller5428f641999-11-25 11:54:57 +110075/*
76 * Maximum file descriptor value used in any of the channels. This is
Ben Lindstrom99c73b32001-05-05 04:09:47 +000077 * updated in channel_new.
Damien Miller5428f641999-11-25 11:54:57 +110078 */
Damien Miller5e953212001-01-30 09:14:00 +110079static int channel_max_fd = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100080
Damien Millerd4a8b7e1999-10-27 13:42:43 +100081
Ben Lindstrome9c99912001-06-09 00:41:05 +000082/* -- tcp forwarding */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100083
Damien Miller5428f641999-11-25 11:54:57 +110084/*
85 * Data structure for storing which hosts are permitted for forward requests.
86 * The local sides of any remote forwards are stored in this array to prevent
87 * a corrupt remote server from accessing arbitrary TCP/IP ports on our local
88 * network (which might be behind a firewall).
89 */
Damien Miller95def091999-11-25 00:26:21 +110090typedef struct {
Damien Millerb38eff82000-04-01 11:09:21 +100091 char *host_to_connect; /* Connect to 'host'. */
92 u_short port_to_connect; /* Connect to 'port'. */
93 u_short listen_port; /* Remote side should listen port number. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100094} ForwardPermission;
95
96/* List of all permitted host/port pairs to connect. */
97static ForwardPermission permitted_opens[SSH_MAX_FORWARDS_PER_DIRECTION];
Ben Lindstrome9c99912001-06-09 00:41:05 +000098
Damien Millerd4a8b7e1999-10-27 13:42:43 +100099/* Number of permitted host/port pairs in the array. */
100static int num_permitted_opens = 0;
Damien Miller5428f641999-11-25 11:54:57 +1100101/*
102 * If this is true, all opens are permitted. This is the case on the server
103 * on which we have to trust the client anyway, and the user could do
104 * anything after logging in anyway.
105 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000106static int all_opens_permitted = 0;
107
Ben Lindstrome9c99912001-06-09 00:41:05 +0000108
109/* -- X11 forwarding */
110
111/* Maximum number of fake X11 displays to try. */
112#define MAX_DISPLAYS 1000
113
Damien Miller13390022005-07-06 09:44:19 +1000114/* Saved X11 local (client) display. */
115static char *x11_saved_display = NULL;
116
Ben Lindstrome9c99912001-06-09 00:41:05 +0000117/* Saved X11 authentication protocol name. */
118static char *x11_saved_proto = NULL;
119
120/* Saved X11 authentication data. This is the real data. */
121static char *x11_saved_data = NULL;
122static u_int x11_saved_data_len = 0;
123
124/*
125 * Fake X11 authentication data. This is what the server will be sending us;
126 * we should replace any occurrences of this by the real data.
127 */
128static char *x11_fake_data = NULL;
129static u_int x11_fake_data_len;
130
131
132/* -- agent forwarding */
133
134#define NUM_SOCKS 10
135
Ben Lindstrom226cfa02001-01-22 05:34:40 +0000136/* AF_UNSPEC or AF_INET or AF_INET6 */
Ben Lindstrom908afed2001-10-03 17:34:59 +0000137static int IPv4or6 = AF_UNSPEC;
Ben Lindstrom226cfa02001-01-22 05:34:40 +0000138
Ben Lindstrome9c99912001-06-09 00:41:05 +0000139/* helper */
Ben Lindstrombba81212001-06-25 05:01:22 +0000140static void port_open_helper(Channel *c, char *rtype);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000141
Ben Lindstrome9c99912001-06-09 00:41:05 +0000142/* -- channel core */
Damien Millerb38eff82000-04-01 11:09:21 +1000143
144Channel *
145channel_lookup(int id)
146{
147 Channel *c;
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000148
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000149 if (id < 0 || (u_int)id >= channels_alloc) {
Damien Miller996acd22003-04-09 20:59:48 +1000150 logit("channel_lookup: %d: bad id", id);
Damien Millerb38eff82000-04-01 11:09:21 +1000151 return NULL;
152 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000153 c = channels[id];
154 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000155 logit("channel_lookup: %d: bad id: channel free", id);
Damien Millerb38eff82000-04-01 11:09:21 +1000156 return NULL;
157 }
158 return c;
159}
160
Damien Miller5428f641999-11-25 11:54:57 +1100161/*
Damien Millere247cc42000-05-07 12:03:14 +1000162 * Register filedescriptors for a channel, used when allocating a channel or
Damien Miller6f83b8e2000-05-02 09:23:45 +1000163 * when the channel consumer/producer is ready, e.g. shell exec'd
Damien Miller5428f641999-11-25 11:54:57 +1100164 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000165
Ben Lindstrombba81212001-06-25 05:01:22 +0000166static void
Damien Miller69b69aa2000-10-28 14:19:58 +1100167channel_register_fds(Channel *c, int rfd, int wfd, int efd,
168 int extusage, int nonblock)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000169{
Damien Miller95def091999-11-25 00:26:21 +1100170 /* Update the maximum file descriptor value. */
Damien Miller5e953212001-01-30 09:14:00 +1100171 channel_max_fd = MAX(channel_max_fd, rfd);
172 channel_max_fd = MAX(channel_max_fd, wfd);
173 channel_max_fd = MAX(channel_max_fd, efd);
174
Damien Miller5428f641999-11-25 11:54:57 +1100175 /* XXX set close-on-exec -markus */
Damien Millere247cc42000-05-07 12:03:14 +1000176
Damien Miller6f83b8e2000-05-02 09:23:45 +1000177 c->rfd = rfd;
178 c->wfd = wfd;
179 c->sock = (rfd == wfd) ? rfd : -1;
Damien Miller0e220db2004-06-15 10:34:08 +1000180 c->ctl_fd = -1; /* XXX: set elsewhere */
Damien Miller6f83b8e2000-05-02 09:23:45 +1000181 c->efd = efd;
182 c->extended_usage = extusage;
Damien Miller69b69aa2000-10-28 14:19:58 +1100183
Damien Miller79438cc2001-02-16 12:34:57 +1100184 /* XXX ugly hack: nonblock is only set by the server */
185 if (nonblock && isatty(c->rfd)) {
Damien Millerfbdeece2003-09-02 22:52:31 +1000186 debug2("channel %d: rfd %d isatty", c->self, c->rfd);
Damien Miller79438cc2001-02-16 12:34:57 +1100187 c->isatty = 1;
188 if (!isatty(c->wfd)) {
Ben Lindstromcc74df72001-03-05 06:20:14 +0000189 error("channel %d: wfd %d is not a tty?",
Damien Miller79438cc2001-02-16 12:34:57 +1100190 c->self, c->wfd);
191 }
192 } else {
193 c->isatty = 0;
194 }
Ben Lindstrombeb5f332002-07-22 15:28:53 +0000195 c->wfd_isatty = isatty(c->wfd);
Damien Miller79438cc2001-02-16 12:34:57 +1100196
Damien Miller69b69aa2000-10-28 14:19:58 +1100197 /* enable nonblocking mode */
198 if (nonblock) {
199 if (rfd != -1)
200 set_nonblock(rfd);
201 if (wfd != -1)
202 set_nonblock(wfd);
203 if (efd != -1)
204 set_nonblock(efd);
205 }
Damien Miller6f83b8e2000-05-02 09:23:45 +1000206}
207
208/*
209 * Allocate a new channel object and set its type and socket. This will cause
210 * remote_name to be freed.
211 */
212
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000213Channel *
Damien Miller6f83b8e2000-05-02 09:23:45 +1000214channel_new(char *ctype, int type, int rfd, int wfd, int efd,
Ben Lindstrom4fed2be2002-06-25 23:17:36 +0000215 u_int window, u_int maxpack, int extusage, char *remote_name, int nonblock)
Damien Miller6f83b8e2000-05-02 09:23:45 +1000216{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000217 int found;
218 u_int i;
Damien Miller6f83b8e2000-05-02 09:23:45 +1000219 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000220
Damien Miller95def091999-11-25 00:26:21 +1100221 /* Do initial allocation if this is the first call. */
222 if (channels_alloc == 0) {
223 channels_alloc = 10;
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000224 channels = xmalloc(channels_alloc * sizeof(Channel *));
Damien Miller95def091999-11-25 00:26:21 +1100225 for (i = 0; i < channels_alloc; i++)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000226 channels[i] = NULL;
Damien Miller95def091999-11-25 00:26:21 +1100227 }
228 /* Try to find a free slot where to put the new channel. */
229 for (found = -1, i = 0; i < channels_alloc; i++)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000230 if (channels[i] == NULL) {
Damien Miller95def091999-11-25 00:26:21 +1100231 /* Found a free slot. */
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000232 found = (int)i;
Damien Miller95def091999-11-25 00:26:21 +1100233 break;
234 }
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000235 if (found < 0) {
Damien Miller5428f641999-11-25 11:54:57 +1100236 /* There are no free slots. Take last+1 slot and expand the array. */
Damien Miller95def091999-11-25 00:26:21 +1100237 found = channels_alloc;
Damien Miller9403aa22002-06-26 19:14:43 +1000238 if (channels_alloc > 10000)
239 fatal("channel_new: internal error: channels_alloc %d "
240 "too big.", channels_alloc);
Damien Miller5efcecc2003-09-17 07:31:14 +1000241 channels = xrealloc(channels,
242 (channels_alloc + 10) * sizeof(Channel *));
243 channels_alloc += 10;
Damien Millerd3444942000-09-30 14:20:03 +1100244 debug2("channel: expanding %d", channels_alloc);
Damien Miller95def091999-11-25 00:26:21 +1100245 for (i = found; i < channels_alloc; i++)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000246 channels[i] = NULL;
Damien Miller95def091999-11-25 00:26:21 +1100247 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000248 /* Initialize and return new channel. */
249 c = channels[found] = xmalloc(sizeof(Channel));
Damien Miller4623a752001-10-10 15:03:58 +1000250 memset(c, 0, sizeof(Channel));
Damien Miller95def091999-11-25 00:26:21 +1100251 buffer_init(&c->input);
252 buffer_init(&c->output);
Damien Millerb38eff82000-04-01 11:09:21 +1000253 buffer_init(&c->extended);
Damien Miller5144df92002-01-22 23:28:45 +1100254 c->ostate = CHAN_OUTPUT_OPEN;
255 c->istate = CHAN_INPUT_OPEN;
256 c->flags = 0;
Damien Miller69b69aa2000-10-28 14:19:58 +1100257 channel_register_fds(c, rfd, wfd, efd, extusage, nonblock);
Damien Miller95def091999-11-25 00:26:21 +1100258 c->self = found;
259 c->type = type;
Damien Millerb38eff82000-04-01 11:09:21 +1000260 c->ctype = ctype;
Damien Millerbd483e72000-04-30 10:00:53 +1000261 c->local_window = window;
262 c->local_window_max = window;
263 c->local_consumed = 0;
264 c->local_maxpacket = maxpack;
Damien Miller95def091999-11-25 00:26:21 +1100265 c->remote_id = -1;
Damien Millerb1ca8bb2003-05-14 13:45:42 +1000266 c->remote_name = xstrdup(remote_name);
Damien Millerb38eff82000-04-01 11:09:21 +1000267 c->remote_window = 0;
268 c->remote_maxpacket = 0;
Ben Lindstrom944c4f02001-09-18 05:51:13 +0000269 c->force_drain = 0;
Damien Millere7378562001-12-21 14:58:35 +1100270 c->single_connection = 0;
Ben Lindstrom809744e2001-07-04 05:26:06 +0000271 c->detach_user = NULL;
Damien Miller67f0bc02002-02-05 12:23:08 +1100272 c->confirm = NULL;
Damien Miller0e220db2004-06-15 10:34:08 +1000273 c->confirm_ctx = NULL;
Damien Millerad833b32000-08-23 10:46:23 +1000274 c->input_filter = NULL;
Damien Miller95def091999-11-25 00:26:21 +1100275 debug("channel %d: new [%s]", found, remote_name);
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000276 return c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000277}
Damien Miller6f83b8e2000-05-02 09:23:45 +1000278
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000279static int
280channel_find_maxfd(void)
281{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000282 u_int i;
283 int max = 0;
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000284 Channel *c;
285
286 for (i = 0; i < channels_alloc; i++) {
287 c = channels[i];
288 if (c != NULL) {
289 max = MAX(max, c->rfd);
290 max = MAX(max, c->wfd);
291 max = MAX(max, c->efd);
292 }
293 }
294 return max;
295}
296
297int
298channel_close_fd(int *fdp)
299{
300 int ret = 0, fd = *fdp;
301
302 if (fd != -1) {
303 ret = close(fd);
304 *fdp = -1;
305 if (fd == channel_max_fd)
306 channel_max_fd = channel_find_maxfd();
307 }
308 return ret;
309}
310
Damien Miller6f83b8e2000-05-02 09:23:45 +1000311/* Close all channel fd/socket. */
312
Ben Lindstrombba81212001-06-25 05:01:22 +0000313static void
Damien Miller6f83b8e2000-05-02 09:23:45 +1000314channel_close_fds(Channel *c)
315{
Damien Miller0e220db2004-06-15 10:34:08 +1000316 debug3("channel %d: close_fds r %d w %d e %d c %d",
317 c->self, c->rfd, c->wfd, c->efd, c->ctl_fd);
Ben Lindstromc0dee1a2001-06-05 20:52:50 +0000318
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000319 channel_close_fd(&c->sock);
Damien Miller0e220db2004-06-15 10:34:08 +1000320 channel_close_fd(&c->ctl_fd);
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000321 channel_close_fd(&c->rfd);
322 channel_close_fd(&c->wfd);
323 channel_close_fd(&c->efd);
Damien Miller6f83b8e2000-05-02 09:23:45 +1000324}
325
326/* Free the channel and close its fd/socket. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000327
Damien Miller4af51302000-04-16 11:18:38 +1000328void
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000329channel_free(Channel *c)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000330{
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000331 char *s;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000332 u_int i, n;
Ben Lindstromc0dee1a2001-06-05 20:52:50 +0000333
334 for (n = 0, i = 0; i < channels_alloc; i++)
335 if (channels[i])
336 n++;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000337 debug("channel %d: free: %s, nchannels %u", c->self,
Ben Lindstromc0dee1a2001-06-05 20:52:50 +0000338 c->remote_name ? c->remote_name : "???", n);
Ben Lindstrom6c3ae2b2000-12-30 03:25:14 +0000339
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000340 s = channel_open_message();
Damien Millerfbdeece2003-09-02 22:52:31 +1000341 debug3("channel %d: status: %s", c->self, s);
Ben Lindstrom6c3ae2b2000-12-30 03:25:14 +0000342 xfree(s);
343
Damien Miller6f83b8e2000-05-02 09:23:45 +1000344 if (c->sock != -1)
Damien Millerb38eff82000-04-01 11:09:21 +1000345 shutdown(c->sock, SHUT_RDWR);
Damien Miller0e220db2004-06-15 10:34:08 +1000346 if (c->ctl_fd != -1)
347 shutdown(c->ctl_fd, SHUT_RDWR);
Damien Miller6f83b8e2000-05-02 09:23:45 +1000348 channel_close_fds(c);
Damien Millerb38eff82000-04-01 11:09:21 +1000349 buffer_free(&c->input);
350 buffer_free(&c->output);
351 buffer_free(&c->extended);
Damien Millerb38eff82000-04-01 11:09:21 +1000352 if (c->remote_name) {
353 xfree(c->remote_name);
354 c->remote_name = NULL;
Damien Miller95def091999-11-25 00:26:21 +1100355 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000356 channels[c->self] = NULL;
357 xfree(c);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000358}
359
Ben Lindstrome9c99912001-06-09 00:41:05 +0000360void
Ben Lindstrom601e4362001-06-21 03:19:23 +0000361channel_free_all(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000362{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000363 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000364
Ben Lindstrom601e4362001-06-21 03:19:23 +0000365 for (i = 0; i < channels_alloc; i++)
366 if (channels[i] != NULL)
367 channel_free(channels[i]);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000368}
369
370/*
371 * Closes the sockets/fds of all channels. This is used to close extra file
372 * descriptors after a fork.
373 */
374
375void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000376channel_close_all(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000377{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000378 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000379
380 for (i = 0; i < channels_alloc; i++)
381 if (channels[i] != NULL)
382 channel_close_fds(channels[i]);
383}
384
385/*
Ben Lindstrom809744e2001-07-04 05:26:06 +0000386 * Stop listening to channels.
387 */
388
389void
390channel_stop_listening(void)
391{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000392 u_int i;
Ben Lindstrom809744e2001-07-04 05:26:06 +0000393 Channel *c;
394
395 for (i = 0; i < channels_alloc; i++) {
396 c = channels[i];
397 if (c != NULL) {
398 switch (c->type) {
399 case SSH_CHANNEL_AUTH_SOCKET:
400 case SSH_CHANNEL_PORT_LISTENER:
401 case SSH_CHANNEL_RPORT_LISTENER:
402 case SSH_CHANNEL_X11_LISTENER:
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000403 channel_close_fd(&c->sock);
Ben Lindstrom809744e2001-07-04 05:26:06 +0000404 channel_free(c);
405 break;
406 }
407 }
408 }
409}
410
411/*
Ben Lindstrome9c99912001-06-09 00:41:05 +0000412 * Returns true if no channel has too much buffered data, and false if one or
413 * more channel is overfull.
414 */
415
416int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000417channel_not_very_much_buffered_data(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000418{
419 u_int i;
420 Channel *c;
421
422 for (i = 0; i < channels_alloc; i++) {
423 c = channels[i];
424 if (c != NULL && c->type == SSH_CHANNEL_OPEN) {
Damien Milleraf5f2e62001-10-10 15:01:16 +1000425#if 0
426 if (!compat20 &&
427 buffer_len(&c->input) > packet_get_maxsize()) {
Damien Miller275295e2003-01-08 14:04:09 +1100428 debug2("channel %d: big input buffer %d",
Ben Lindstrome9c99912001-06-09 00:41:05 +0000429 c->self, buffer_len(&c->input));
430 return 0;
431 }
Damien Milleraf5f2e62001-10-10 15:01:16 +1000432#endif
Ben Lindstrome9c99912001-06-09 00:41:05 +0000433 if (buffer_len(&c->output) > packet_get_maxsize()) {
Darren Tucker502d3842003-06-28 12:38:01 +1000434 debug2("channel %d: big output buffer %u > %u",
Damien Milleraf5f2e62001-10-10 15:01:16 +1000435 c->self, buffer_len(&c->output),
436 packet_get_maxsize());
Ben Lindstrome9c99912001-06-09 00:41:05 +0000437 return 0;
438 }
439 }
440 }
441 return 1;
442}
443
444/* Returns true if any channel is still open. */
445
446int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000447channel_still_open(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000448{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000449 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000450 Channel *c;
451
452 for (i = 0; i < channels_alloc; i++) {
453 c = channels[i];
454 if (c == NULL)
455 continue;
456 switch (c->type) {
457 case SSH_CHANNEL_X11_LISTENER:
458 case SSH_CHANNEL_PORT_LISTENER:
459 case SSH_CHANNEL_RPORT_LISTENER:
460 case SSH_CHANNEL_CLOSED:
461 case SSH_CHANNEL_AUTH_SOCKET:
462 case SSH_CHANNEL_DYNAMIC:
463 case SSH_CHANNEL_CONNECTING:
464 case SSH_CHANNEL_ZOMBIE:
465 continue;
466 case SSH_CHANNEL_LARVAL:
467 if (!compat20)
468 fatal("cannot happen: SSH_CHANNEL_LARVAL");
469 continue;
470 case SSH_CHANNEL_OPENING:
471 case SSH_CHANNEL_OPEN:
472 case SSH_CHANNEL_X11_OPEN:
473 return 1;
474 case SSH_CHANNEL_INPUT_DRAINING:
475 case SSH_CHANNEL_OUTPUT_DRAINING:
476 if (!compat13)
477 fatal("cannot happen: OUT_DRAIN");
478 return 1;
479 default:
480 fatal("channel_still_open: bad channel type %d", c->type);
481 /* NOTREACHED */
482 }
483 }
484 return 0;
485}
486
487/* Returns the id of an open channel suitable for keepaliving */
488
489int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000490channel_find_open(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000491{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000492 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000493 Channel *c;
494
495 for (i = 0; i < channels_alloc; i++) {
496 c = channels[i];
Damien Miller3bbd8782004-06-18 22:23:22 +1000497 if (c == NULL || c->remote_id < 0)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000498 continue;
499 switch (c->type) {
500 case SSH_CHANNEL_CLOSED:
501 case SSH_CHANNEL_DYNAMIC:
502 case SSH_CHANNEL_X11_LISTENER:
503 case SSH_CHANNEL_PORT_LISTENER:
504 case SSH_CHANNEL_RPORT_LISTENER:
505 case SSH_CHANNEL_OPENING:
506 case SSH_CHANNEL_CONNECTING:
507 case SSH_CHANNEL_ZOMBIE:
508 continue;
509 case SSH_CHANNEL_LARVAL:
510 case SSH_CHANNEL_AUTH_SOCKET:
511 case SSH_CHANNEL_OPEN:
512 case SSH_CHANNEL_X11_OPEN:
513 return i;
514 case SSH_CHANNEL_INPUT_DRAINING:
515 case SSH_CHANNEL_OUTPUT_DRAINING:
516 if (!compat13)
517 fatal("cannot happen: OUT_DRAIN");
518 return i;
519 default:
520 fatal("channel_find_open: bad channel type %d", c->type);
521 /* NOTREACHED */
522 }
523 }
524 return -1;
525}
526
527
528/*
529 * Returns a message describing the currently open forwarded connections,
530 * suitable for sending to the client. The message contains crlf pairs for
531 * newlines.
532 */
533
534char *
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000535channel_open_message(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000536{
537 Buffer buffer;
538 Channel *c;
539 char buf[1024], *cp;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000540 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000541
542 buffer_init(&buffer);
543 snprintf(buf, sizeof buf, "The following connections are open:\r\n");
544 buffer_append(&buffer, buf, strlen(buf));
545 for (i = 0; i < channels_alloc; i++) {
546 c = channels[i];
547 if (c == NULL)
548 continue;
549 switch (c->type) {
550 case SSH_CHANNEL_X11_LISTENER:
551 case SSH_CHANNEL_PORT_LISTENER:
552 case SSH_CHANNEL_RPORT_LISTENER:
553 case SSH_CHANNEL_CLOSED:
554 case SSH_CHANNEL_AUTH_SOCKET:
555 case SSH_CHANNEL_ZOMBIE:
556 continue;
557 case SSH_CHANNEL_LARVAL:
558 case SSH_CHANNEL_OPENING:
559 case SSH_CHANNEL_CONNECTING:
560 case SSH_CHANNEL_DYNAMIC:
561 case SSH_CHANNEL_OPEN:
562 case SSH_CHANNEL_X11_OPEN:
563 case SSH_CHANNEL_INPUT_DRAINING:
564 case SSH_CHANNEL_OUTPUT_DRAINING:
Damien Miller0e220db2004-06-15 10:34:08 +1000565 snprintf(buf, sizeof buf,
566 " #%d %.300s (t%d r%d i%d/%d o%d/%d fd %d/%d cfd %d)\r\n",
Ben Lindstrome9c99912001-06-09 00:41:05 +0000567 c->self, c->remote_name,
568 c->type, c->remote_id,
569 c->istate, buffer_len(&c->input),
570 c->ostate, buffer_len(&c->output),
Damien Miller0e220db2004-06-15 10:34:08 +1000571 c->rfd, c->wfd, c->ctl_fd);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000572 buffer_append(&buffer, buf, strlen(buf));
573 continue;
574 default:
575 fatal("channel_open_message: bad channel type %d", c->type);
576 /* NOTREACHED */
577 }
578 }
579 buffer_append(&buffer, "\0", 1);
580 cp = xstrdup(buffer_ptr(&buffer));
581 buffer_free(&buffer);
582 return cp;
583}
584
585void
586channel_send_open(int id)
587{
588 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000589
Ben Lindstrome9c99912001-06-09 00:41:05 +0000590 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000591 logit("channel_send_open: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000592 return;
593 }
Ben Lindstrom1d568f92002-12-23 02:44:36 +0000594 debug2("channel %d: send open", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000595 packet_start(SSH2_MSG_CHANNEL_OPEN);
596 packet_put_cstring(c->ctype);
597 packet_put_int(c->self);
598 packet_put_int(c->local_window);
599 packet_put_int(c->local_maxpacket);
600 packet_send();
601}
602
603void
Ben Lindstrom1d568f92002-12-23 02:44:36 +0000604channel_request_start(int id, char *service, int wantconfirm)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000605{
Ben Lindstrom1d568f92002-12-23 02:44:36 +0000606 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000607
Ben Lindstrome9c99912001-06-09 00:41:05 +0000608 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000609 logit("channel_request_start: %d: unknown channel id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000610 return;
611 }
Damien Miller0e220db2004-06-15 10:34:08 +1000612 debug2("channel %d: request %s confirm %d", id, service, wantconfirm);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000613 packet_start(SSH2_MSG_CHANNEL_REQUEST);
614 packet_put_int(c->remote_id);
615 packet_put_cstring(service);
616 packet_put_char(wantconfirm);
617}
618void
Damien Miller0e220db2004-06-15 10:34:08 +1000619channel_register_confirm(int id, channel_callback_fn *fn, void *ctx)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000620{
621 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000622
Ben Lindstrome9c99912001-06-09 00:41:05 +0000623 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000624 logit("channel_register_comfirm: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000625 return;
626 }
Damien Miller67f0bc02002-02-05 12:23:08 +1100627 c->confirm = fn;
Damien Miller0e220db2004-06-15 10:34:08 +1000628 c->confirm_ctx = ctx;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000629}
630void
631channel_register_cleanup(int id, channel_callback_fn *fn)
632{
633 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000634
Ben Lindstrome9c99912001-06-09 00:41:05 +0000635 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000636 logit("channel_register_cleanup: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000637 return;
638 }
Ben Lindstrom809744e2001-07-04 05:26:06 +0000639 c->detach_user = fn;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000640}
641void
642channel_cancel_cleanup(int id)
643{
644 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000645
Ben Lindstrome9c99912001-06-09 00:41:05 +0000646 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000647 logit("channel_cancel_cleanup: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000648 return;
649 }
Ben Lindstrom809744e2001-07-04 05:26:06 +0000650 c->detach_user = NULL;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000651}
652void
653channel_register_filter(int id, channel_filter_fn *fn)
654{
655 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000656
Ben Lindstrome9c99912001-06-09 00:41:05 +0000657 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000658 logit("channel_register_filter: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000659 return;
660 }
661 c->input_filter = fn;
662}
663
664void
665channel_set_fds(int id, int rfd, int wfd, int efd,
Damien Miller2aa0c192002-02-19 15:20:08 +1100666 int extusage, int nonblock, u_int window_max)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000667{
668 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000669
Ben Lindstrome9c99912001-06-09 00:41:05 +0000670 if (c == NULL || c->type != SSH_CHANNEL_LARVAL)
671 fatal("channel_activate for non-larval channel %d.", id);
672 channel_register_fds(c, rfd, wfd, efd, extusage, nonblock);
673 c->type = SSH_CHANNEL_OPEN;
Damien Miller2aa0c192002-02-19 15:20:08 +1100674 c->local_window = c->local_window_max = window_max;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000675 packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
676 packet_put_int(c->remote_id);
677 packet_put_int(c->local_window);
678 packet_send();
679}
680
Damien Miller5428f641999-11-25 11:54:57 +1100681/*
Damien Millerb38eff82000-04-01 11:09:21 +1000682 * 'channel_pre*' are called just before select() to add any bits relevant to
683 * channels in the select bitmasks.
Damien Miller5428f641999-11-25 11:54:57 +1100684 */
Damien Millerb38eff82000-04-01 11:09:21 +1000685/*
686 * 'channel_post*': perform any appropriate operations for channels which
687 * have events pending.
688 */
689typedef void chan_fn(Channel *c, fd_set * readset, fd_set * writeset);
690chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE];
691chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE];
692
Ben Lindstrombba81212001-06-25 05:01:22 +0000693static void
Damien Millerb38eff82000-04-01 11:09:21 +1000694channel_pre_listener(Channel *c, fd_set * readset, fd_set * writeset)
695{
696 FD_SET(c->sock, readset);
697}
698
Ben Lindstrombba81212001-06-25 05:01:22 +0000699static void
Ben Lindstrom7ad97102000-12-06 01:42:49 +0000700channel_pre_connecting(Channel *c, fd_set * readset, fd_set * writeset)
701{
702 debug3("channel %d: waiting for connection", c->self);
703 FD_SET(c->sock, writeset);
704}
705
Ben Lindstrombba81212001-06-25 05:01:22 +0000706static void
Damien Millerb38eff82000-04-01 11:09:21 +1000707channel_pre_open_13(Channel *c, fd_set * readset, fd_set * writeset)
708{
709 if (buffer_len(&c->input) < packet_get_maxsize())
710 FD_SET(c->sock, readset);
711 if (buffer_len(&c->output) > 0)
712 FD_SET(c->sock, writeset);
713}
714
Ben Lindstrombba81212001-06-25 05:01:22 +0000715static void
Damien Millerde6987c2002-01-22 23:20:40 +1100716channel_pre_open(Channel *c, fd_set * readset, fd_set * writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000717{
Damien Millerde6987c2002-01-22 23:20:40 +1100718 u_int limit = compat20 ? c->remote_window : packet_get_maxsize();
Damien Millerb38eff82000-04-01 11:09:21 +1000719
Darren Tucker11327cc2005-03-14 23:22:25 +1100720 /* check buffer limits */
721 limit = MIN(limit, (BUFFER_MAX_LEN - BUFFER_MAX_CHUNK - CHAN_RBUF));
722
Damien Miller33b13562000-04-04 14:38:59 +1000723 if (c->istate == CHAN_INPUT_OPEN &&
Damien Millerde6987c2002-01-22 23:20:40 +1100724 limit > 0 &&
725 buffer_len(&c->input) < limit)
Damien Miller33b13562000-04-04 14:38:59 +1000726 FD_SET(c->rfd, readset);
727 if (c->ostate == CHAN_OUTPUT_OPEN ||
728 c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
729 if (buffer_len(&c->output) > 0) {
730 FD_SET(c->wfd, writeset);
731 } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
Ben Lindstromcf159442002-03-26 03:26:24 +0000732 if (CHANNEL_EFD_OUTPUT_ACTIVE(c))
Damien Miller0dc1bef2005-07-17 17:22:45 +1000733 debug2("channel %d: obuf_empty delayed efd %d/(%d)",
734 c->self, c->efd, buffer_len(&c->extended));
Ben Lindstromcf159442002-03-26 03:26:24 +0000735 else
736 chan_obuf_empty(c);
Damien Miller33b13562000-04-04 14:38:59 +1000737 }
738 }
739 /** XXX check close conditions, too */
Damien Millerde6987c2002-01-22 23:20:40 +1100740 if (compat20 && c->efd != -1) {
Damien Miller33b13562000-04-04 14:38:59 +1000741 if (c->extended_usage == CHAN_EXTENDED_WRITE &&
742 buffer_len(&c->extended) > 0)
743 FD_SET(c->efd, writeset);
Ben Lindstromcf159442002-03-26 03:26:24 +0000744 else if (!(c->flags & CHAN_EOF_SENT) &&
745 c->extended_usage == CHAN_EXTENDED_READ &&
Damien Miller33b13562000-04-04 14:38:59 +1000746 buffer_len(&c->extended) < c->remote_window)
747 FD_SET(c->efd, readset);
748 }
Damien Miller0e220db2004-06-15 10:34:08 +1000749 /* XXX: What about efd? races? */
Darren Tuckerfc959702004-07-17 16:12:08 +1000750 if (compat20 && c->ctl_fd != -1 &&
Damien Miller0e220db2004-06-15 10:34:08 +1000751 c->istate == CHAN_INPUT_OPEN && c->ostate == CHAN_OUTPUT_OPEN)
752 FD_SET(c->ctl_fd, readset);
Damien Miller33b13562000-04-04 14:38:59 +1000753}
754
Ben Lindstrombba81212001-06-25 05:01:22 +0000755static void
Damien Millerb38eff82000-04-01 11:09:21 +1000756channel_pre_input_draining(Channel *c, fd_set * readset, fd_set * writeset)
757{
758 if (buffer_len(&c->input) == 0) {
759 packet_start(SSH_MSG_CHANNEL_CLOSE);
760 packet_put_int(c->remote_id);
761 packet_send();
762 c->type = SSH_CHANNEL_CLOSED;
Damien Millerfbdeece2003-09-02 22:52:31 +1000763 debug2("channel %d: closing after input drain.", c->self);
Damien Millerb38eff82000-04-01 11:09:21 +1000764 }
765}
766
Ben Lindstrombba81212001-06-25 05:01:22 +0000767static void
Damien Millerb38eff82000-04-01 11:09:21 +1000768channel_pre_output_draining(Channel *c, fd_set * readset, fd_set * writeset)
769{
770 if (buffer_len(&c->output) == 0)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000771 chan_mark_dead(c);
Damien Miller4af51302000-04-16 11:18:38 +1000772 else
Damien Millerb38eff82000-04-01 11:09:21 +1000773 FD_SET(c->sock, writeset);
774}
775
776/*
777 * This is a special state for X11 authentication spoofing. An opened X11
778 * connection (when authentication spoofing is being done) remains in this
779 * state until the first packet has been completely read. The authentication
780 * data in that packet is then substituted by the real data if it matches the
781 * fake data, and the channel is put into normal mode.
Damien Millerbd483e72000-04-30 10:00:53 +1000782 * XXX All this happens at the client side.
Ben Lindstrome9c99912001-06-09 00:41:05 +0000783 * Returns: 0 = need more data, -1 = wrong cookie, 1 = ok
Damien Millerb38eff82000-04-01 11:09:21 +1000784 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000785static int
Ben Lindstrome9c99912001-06-09 00:41:05 +0000786x11_open_helper(Buffer *b)
Damien Millerb38eff82000-04-01 11:09:21 +1000787{
Ben Lindstrom46c16222000-12-22 01:43:59 +0000788 u_char *ucp;
789 u_int proto_len, data_len;
Damien Millerb38eff82000-04-01 11:09:21 +1000790
791 /* Check if the fixed size part of the packet is in buffer. */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000792 if (buffer_len(b) < 12)
Damien Millerb38eff82000-04-01 11:09:21 +1000793 return 0;
794
795 /* Parse the lengths of variable-length fields. */
Damien Miller708d21c2002-01-22 23:18:15 +1100796 ucp = buffer_ptr(b);
Damien Millerb38eff82000-04-01 11:09:21 +1000797 if (ucp[0] == 0x42) { /* Byte order MSB first. */
798 proto_len = 256 * ucp[6] + ucp[7];
799 data_len = 256 * ucp[8] + ucp[9];
800 } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */
801 proto_len = ucp[6] + 256 * ucp[7];
802 data_len = ucp[8] + 256 * ucp[9];
803 } else {
Damien Millerfbdeece2003-09-02 22:52:31 +1000804 debug2("Initial X11 packet contains bad byte order byte: 0x%x",
Damien Miller9f0f5c62001-12-21 14:45:46 +1100805 ucp[0]);
Damien Millerb38eff82000-04-01 11:09:21 +1000806 return -1;
807 }
808
809 /* Check if the whole packet is in buffer. */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000810 if (buffer_len(b) <
Damien Millerb38eff82000-04-01 11:09:21 +1000811 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3))
812 return 0;
813
814 /* Check if authentication protocol matches. */
815 if (proto_len != strlen(x11_saved_proto) ||
816 memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +1000817 debug2("X11 connection uses different authentication protocol.");
Damien Millerb38eff82000-04-01 11:09:21 +1000818 return -1;
819 }
820 /* Check if authentication data matches our fake data. */
821 if (data_len != x11_fake_data_len ||
822 memcmp(ucp + 12 + ((proto_len + 3) & ~3),
823 x11_fake_data, x11_fake_data_len) != 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +1000824 debug2("X11 auth data does not match fake data.");
Damien Millerb38eff82000-04-01 11:09:21 +1000825 return -1;
826 }
827 /* Check fake data length */
828 if (x11_fake_data_len != x11_saved_data_len) {
829 error("X11 fake_data_len %d != saved_data_len %d",
830 x11_fake_data_len, x11_saved_data_len);
831 return -1;
832 }
833 /*
834 * Received authentication protocol and data match
835 * our fake data. Substitute the fake data with real
836 * data.
837 */
838 memcpy(ucp + 12 + ((proto_len + 3) & ~3),
839 x11_saved_data, x11_saved_data_len);
840 return 1;
841}
842
Ben Lindstrombba81212001-06-25 05:01:22 +0000843static void
Damien Millerb38eff82000-04-01 11:09:21 +1000844channel_pre_x11_open_13(Channel *c, fd_set * readset, fd_set * writeset)
845{
Ben Lindstrome9c99912001-06-09 00:41:05 +0000846 int ret = x11_open_helper(&c->output);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000847
Damien Millerb38eff82000-04-01 11:09:21 +1000848 if (ret == 1) {
849 /* Start normal processing for the channel. */
850 c->type = SSH_CHANNEL_OPEN;
Damien Miller78928792000-04-12 20:17:38 +1000851 channel_pre_open_13(c, readset, writeset);
Damien Millerb38eff82000-04-01 11:09:21 +1000852 } else if (ret == -1) {
853 /*
854 * We have received an X11 connection that has bad
855 * authentication information.
856 */
Damien Miller996acd22003-04-09 20:59:48 +1000857 logit("X11 connection rejected because of wrong authentication.");
Damien Millerb38eff82000-04-01 11:09:21 +1000858 buffer_clear(&c->input);
859 buffer_clear(&c->output);
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000860 channel_close_fd(&c->sock);
Damien Millerb38eff82000-04-01 11:09:21 +1000861 c->sock = -1;
862 c->type = SSH_CHANNEL_CLOSED;
863 packet_start(SSH_MSG_CHANNEL_CLOSE);
864 packet_put_int(c->remote_id);
865 packet_send();
866 }
867}
868
Ben Lindstrombba81212001-06-25 05:01:22 +0000869static void
Damien Millerbd483e72000-04-30 10:00:53 +1000870channel_pre_x11_open(Channel *c, fd_set * readset, fd_set * writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000871{
Ben Lindstrome9c99912001-06-09 00:41:05 +0000872 int ret = x11_open_helper(&c->output);
Ben Lindstrom944c4f02001-09-18 05:51:13 +0000873
874 /* c->force_drain = 1; */
875
Damien Millerb38eff82000-04-01 11:09:21 +1000876 if (ret == 1) {
877 c->type = SSH_CHANNEL_OPEN;
Damien Millerde6987c2002-01-22 23:20:40 +1100878 channel_pre_open(c, readset, writeset);
Damien Millerb38eff82000-04-01 11:09:21 +1000879 } else if (ret == -1) {
Damien Miller996acd22003-04-09 20:59:48 +1000880 logit("X11 connection rejected because of wrong authentication.");
Damien Millerfbdeece2003-09-02 22:52:31 +1000881 debug2("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate);
Damien Millera90fc082002-01-22 23:19:38 +1100882 chan_read_failed(c);
883 buffer_clear(&c->input);
884 chan_ibuf_empty(c);
885 buffer_clear(&c->output);
886 /* for proto v1, the peer will send an IEOF */
887 if (compat20)
888 chan_write_failed(c);
889 else
890 c->type = SSH_CHANNEL_OPEN;
Damien Millerfbdeece2003-09-02 22:52:31 +1000891 debug2("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate);
Damien Millerb38eff82000-04-01 11:09:21 +1000892 }
893}
894
Ben Lindstromb3921512001-04-11 15:57:50 +0000895/* try to decode a socks4 header */
Ben Lindstrombba81212001-06-25 05:01:22 +0000896static int
Ben Lindstromb3921512001-04-11 15:57:50 +0000897channel_decode_socks4(Channel *c, fd_set * readset, fd_set * writeset)
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000898{
Damien Millera10f5612002-09-12 09:49:15 +1000899 char *p, *host;
Damien Millereccb9de2005-06-17 12:59:34 +1000900 u_int len, have, i, found;
Damien Miller9f0f5c62001-12-21 14:45:46 +1100901 char username[256];
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000902 struct {
903 u_int8_t version;
904 u_int8_t command;
905 u_int16_t dest_port;
Ben Lindstromb3921512001-04-11 15:57:50 +0000906 struct in_addr dest_addr;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000907 } s4_req, s4_rsp;
908
Ben Lindstromb3921512001-04-11 15:57:50 +0000909 debug2("channel %d: decode socks4", c->self);
Ben Lindstrom2b261b92001-04-17 18:14:34 +0000910
911 have = buffer_len(&c->input);
912 len = sizeof(s4_req);
913 if (have < len)
914 return 0;
915 p = buffer_ptr(&c->input);
916 for (found = 0, i = len; i < have; i++) {
917 if (p[i] == '\0') {
918 found = 1;
919 break;
920 }
921 if (i > 1024) {
922 /* the peer is probably sending garbage */
923 debug("channel %d: decode socks4: too long",
924 c->self);
925 return -1;
926 }
927 }
928 if (!found)
929 return 0;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000930 buffer_get(&c->input, (char *)&s4_req.version, 1);
931 buffer_get(&c->input, (char *)&s4_req.command, 1);
932 buffer_get(&c->input, (char *)&s4_req.dest_port, 2);
Ben Lindstromb3921512001-04-11 15:57:50 +0000933 buffer_get(&c->input, (char *)&s4_req.dest_addr, 4);
Ben Lindstrom2b261b92001-04-17 18:14:34 +0000934 have = buffer_len(&c->input);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000935 p = buffer_ptr(&c->input);
936 len = strlen(p);
Ben Lindstrom6fa9d102001-04-11 23:08:17 +0000937 debug2("channel %d: decode socks4: user %s/%d", c->self, p, len);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000938 if (len > have)
Ben Lindstromb3921512001-04-11 15:57:50 +0000939 fatal("channel %d: decode socks4: len %d > have %d",
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000940 c->self, len, have);
941 strlcpy(username, p, sizeof(username));
942 buffer_consume(&c->input, len);
943 buffer_consume(&c->input, 1); /* trailing '\0' */
944
Ben Lindstromb3921512001-04-11 15:57:50 +0000945 host = inet_ntoa(s4_req.dest_addr);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000946 strlcpy(c->path, host, sizeof(c->path));
947 c->host_port = ntohs(s4_req.dest_port);
Damien Miller9f0f5c62001-12-21 14:45:46 +1100948
Damien Millerfbdeece2003-09-02 22:52:31 +1000949 debug2("channel %d: dynamic request: socks4 host %s port %u command %u",
Ben Lindstrom6fa9d102001-04-11 23:08:17 +0000950 c->self, host, c->host_port, s4_req.command);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000951
Ben Lindstromb3921512001-04-11 15:57:50 +0000952 if (s4_req.command != 1) {
953 debug("channel %d: cannot handle: socks4 cn %d",
954 c->self, s4_req.command);
955 return -1;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000956 }
Ben Lindstromb3921512001-04-11 15:57:50 +0000957 s4_rsp.version = 0; /* vn: 0 for reply */
958 s4_rsp.command = 90; /* cd: req granted */
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000959 s4_rsp.dest_port = 0; /* ignored */
Ben Lindstromb3921512001-04-11 15:57:50 +0000960 s4_rsp.dest_addr.s_addr = INADDR_ANY; /* ignored */
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000961 buffer_append(&c->output, (char *)&s4_rsp, sizeof(s4_rsp));
Ben Lindstromb3921512001-04-11 15:57:50 +0000962 return 1;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000963}
964
Darren Tucker46471c92003-07-03 13:55:19 +1000965/* try to decode a socks5 header */
966#define SSH_SOCKS5_AUTHDONE 0x1000
967#define SSH_SOCKS5_NOAUTH 0x00
968#define SSH_SOCKS5_IPV4 0x01
969#define SSH_SOCKS5_DOMAIN 0x03
970#define SSH_SOCKS5_IPV6 0x04
971#define SSH_SOCKS5_CONNECT 0x01
972#define SSH_SOCKS5_SUCCESS 0x00
973
974static int
975channel_decode_socks5(Channel *c, fd_set * readset, fd_set * writeset)
976{
977 struct {
978 u_int8_t version;
979 u_int8_t command;
980 u_int8_t reserved;
981 u_int8_t atyp;
982 } s5_req, s5_rsp;
983 u_int16_t dest_port;
984 u_char *p, dest_addr[255+1];
Damien Millereccb9de2005-06-17 12:59:34 +1000985 u_int have, i, found, nmethods, addrlen, af;
Darren Tucker46471c92003-07-03 13:55:19 +1000986
987 debug2("channel %d: decode socks5", c->self);
988 p = buffer_ptr(&c->input);
989 if (p[0] != 0x05)
990 return -1;
991 have = buffer_len(&c->input);
992 if (!(c->flags & SSH_SOCKS5_AUTHDONE)) {
993 /* format: ver | nmethods | methods */
Damien Millera8e06ce2003-11-21 23:48:55 +1100994 if (have < 2)
Darren Tucker46471c92003-07-03 13:55:19 +1000995 return 0;
996 nmethods = p[1];
997 if (have < nmethods + 2)
998 return 0;
999 /* look for method: "NO AUTHENTICATION REQUIRED" */
1000 for (found = 0, i = 2 ; i < nmethods + 2; i++) {
1001 if (p[i] == SSH_SOCKS5_NOAUTH ) {
1002 found = 1;
1003 break;
1004 }
1005 }
1006 if (!found) {
1007 debug("channel %d: method SSH_SOCKS5_NOAUTH not found",
1008 c->self);
1009 return -1;
1010 }
1011 buffer_consume(&c->input, nmethods + 2);
1012 buffer_put_char(&c->output, 0x05); /* version */
1013 buffer_put_char(&c->output, SSH_SOCKS5_NOAUTH); /* method */
1014 FD_SET(c->sock, writeset);
1015 c->flags |= SSH_SOCKS5_AUTHDONE;
1016 debug2("channel %d: socks5 auth done", c->self);
1017 return 0; /* need more */
1018 }
1019 debug2("channel %d: socks5 post auth", c->self);
1020 if (have < sizeof(s5_req)+1)
1021 return 0; /* need more */
1022 memcpy((char *)&s5_req, p, sizeof(s5_req));
1023 if (s5_req.version != 0x05 ||
1024 s5_req.command != SSH_SOCKS5_CONNECT ||
1025 s5_req.reserved != 0x00) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001026 debug2("channel %d: only socks5 connect supported", c->self);
Darren Tucker46471c92003-07-03 13:55:19 +10001027 return -1;
1028 }
Darren Tucker47eede72005-03-14 23:08:12 +11001029 switch (s5_req.atyp){
Darren Tucker46471c92003-07-03 13:55:19 +10001030 case SSH_SOCKS5_IPV4:
1031 addrlen = 4;
1032 af = AF_INET;
1033 break;
1034 case SSH_SOCKS5_DOMAIN:
1035 addrlen = p[sizeof(s5_req)];
1036 af = -1;
1037 break;
1038 case SSH_SOCKS5_IPV6:
1039 addrlen = 16;
1040 af = AF_INET6;
1041 break;
1042 default:
Damien Millerfbdeece2003-09-02 22:52:31 +10001043 debug2("channel %d: bad socks5 atyp %d", c->self, s5_req.atyp);
Darren Tucker46471c92003-07-03 13:55:19 +10001044 return -1;
1045 }
1046 if (have < 4 + addrlen + 2)
1047 return 0;
1048 buffer_consume(&c->input, sizeof(s5_req));
1049 if (s5_req.atyp == SSH_SOCKS5_DOMAIN)
1050 buffer_consume(&c->input, 1); /* host string length */
1051 buffer_get(&c->input, (char *)&dest_addr, addrlen);
1052 buffer_get(&c->input, (char *)&dest_port, 2);
1053 dest_addr[addrlen] = '\0';
1054 if (s5_req.atyp == SSH_SOCKS5_DOMAIN)
Darren Tucker1f8311c2004-05-13 16:39:33 +10001055 strlcpy(c->path, (char *)dest_addr, sizeof(c->path));
Darren Tucker46471c92003-07-03 13:55:19 +10001056 else if (inet_ntop(af, dest_addr, c->path, sizeof(c->path)) == NULL)
1057 return -1;
1058 c->host_port = ntohs(dest_port);
Damien Miller787b2ec2003-11-21 23:56:47 +11001059
Damien Millerfbdeece2003-09-02 22:52:31 +10001060 debug2("channel %d: dynamic request: socks5 host %s port %u command %u",
Darren Tucker46471c92003-07-03 13:55:19 +10001061 c->self, c->path, c->host_port, s5_req.command);
1062
1063 s5_rsp.version = 0x05;
1064 s5_rsp.command = SSH_SOCKS5_SUCCESS;
1065 s5_rsp.reserved = 0; /* ignored */
1066 s5_rsp.atyp = SSH_SOCKS5_IPV4;
1067 ((struct in_addr *)&dest_addr)->s_addr = INADDR_ANY;
1068 dest_port = 0; /* ignored */
1069
1070 buffer_append(&c->output, (char *)&s5_rsp, sizeof(s5_rsp));
1071 buffer_append(&c->output, (char *)&dest_addr, sizeof(struct in_addr));
1072 buffer_append(&c->output, (char *)&dest_port, sizeof(dest_port));
1073 return 1;
1074}
1075
Ben Lindstromb3921512001-04-11 15:57:50 +00001076/* dynamic port forwarding */
Ben Lindstrombba81212001-06-25 05:01:22 +00001077static void
Ben Lindstromb3921512001-04-11 15:57:50 +00001078channel_pre_dynamic(Channel *c, fd_set * readset, fd_set * writeset)
1079{
1080 u_char *p;
Damien Millereccb9de2005-06-17 12:59:34 +10001081 u_int have;
1082 int ret;
Ben Lindstromb3921512001-04-11 15:57:50 +00001083
1084 have = buffer_len(&c->input);
Damien Miller4623a752001-10-10 15:03:58 +10001085 c->delayed = 0;
Ben Lindstromb3921512001-04-11 15:57:50 +00001086 debug2("channel %d: pre_dynamic: have %d", c->self, have);
Ben Lindstromc486d882001-04-11 16:08:34 +00001087 /* buffer_dump(&c->input); */
Ben Lindstromb3921512001-04-11 15:57:50 +00001088 /* check if the fixed size part of the packet is in buffer. */
Darren Tucker46471c92003-07-03 13:55:19 +10001089 if (have < 3) {
Ben Lindstromb3921512001-04-11 15:57:50 +00001090 /* need more */
1091 FD_SET(c->sock, readset);
1092 return;
1093 }
1094 /* try to guess the protocol */
1095 p = buffer_ptr(&c->input);
1096 switch (p[0]) {
Ben Lindstrom6fa9d102001-04-11 23:08:17 +00001097 case 0x04:
1098 ret = channel_decode_socks4(c, readset, writeset);
1099 break;
Darren Tucker46471c92003-07-03 13:55:19 +10001100 case 0x05:
1101 ret = channel_decode_socks5(c, readset, writeset);
1102 break;
Ben Lindstromb3921512001-04-11 15:57:50 +00001103 default:
1104 ret = -1;
1105 break;
1106 }
1107 if (ret < 0) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001108 chan_mark_dead(c);
Ben Lindstromb3921512001-04-11 15:57:50 +00001109 } else if (ret == 0) {
1110 debug2("channel %d: pre_dynamic: need more", c->self);
1111 /* need more */
1112 FD_SET(c->sock, readset);
1113 } else {
1114 /* switch to the next state */
1115 c->type = SSH_CHANNEL_OPENING;
1116 port_open_helper(c, "direct-tcpip");
1117 }
1118}
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001119
Damien Millerb38eff82000-04-01 11:09:21 +10001120/* This is our fake X11 server socket. */
Ben Lindstrombba81212001-06-25 05:01:22 +00001121static void
Damien Millerb38eff82000-04-01 11:09:21 +10001122channel_post_x11_listener(Channel *c, fd_set * readset, fd_set * writeset)
1123{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001124 Channel *nc;
Damien Millerb38eff82000-04-01 11:09:21 +10001125 struct sockaddr addr;
Damien Miller398e1cf2002-02-05 11:52:13 +11001126 int newsock;
Damien Millerb38eff82000-04-01 11:09:21 +10001127 socklen_t addrlen;
Damien Millerd83ff352001-01-30 09:19:34 +11001128 char buf[16384], *remote_ipaddr;
Damien Millerbd483e72000-04-30 10:00:53 +10001129 int remote_port;
Damien Millerb38eff82000-04-01 11:09:21 +10001130
1131 if (FD_ISSET(c->sock, readset)) {
1132 debug("X11 connection requested.");
1133 addrlen = sizeof(addr);
1134 newsock = accept(c->sock, &addr, &addrlen);
Damien Millere7378562001-12-21 14:58:35 +11001135 if (c->single_connection) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001136 debug2("single_connection: closing X11 listener.");
Damien Millere7378562001-12-21 14:58:35 +11001137 channel_close_fd(&c->sock);
1138 chan_mark_dead(c);
1139 }
Damien Millerb38eff82000-04-01 11:09:21 +10001140 if (newsock < 0) {
1141 error("accept: %.100s", strerror(errno));
1142 return;
1143 }
Damien Miller398e1cf2002-02-05 11:52:13 +11001144 set_nodelay(newsock);
Damien Millerd83ff352001-01-30 09:19:34 +11001145 remote_ipaddr = get_peer_ipaddr(newsock);
Damien Millerbd483e72000-04-30 10:00:53 +10001146 remote_port = get_peer_port(newsock);
Damien Millerb38eff82000-04-01 11:09:21 +10001147 snprintf(buf, sizeof buf, "X11 connection from %.200s port %d",
Damien Millerd83ff352001-01-30 09:19:34 +11001148 remote_ipaddr, remote_port);
Damien Millerbd483e72000-04-30 10:00:53 +10001149
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001150 nc = channel_new("accepted x11 socket",
Damien Millerbd483e72000-04-30 10:00:53 +10001151 SSH_CHANNEL_OPENING, newsock, newsock, -1,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001152 c->local_window_max, c->local_maxpacket, 0, buf, 1);
Damien Millerbd483e72000-04-30 10:00:53 +10001153 if (compat20) {
1154 packet_start(SSH2_MSG_CHANNEL_OPEN);
1155 packet_put_cstring("x11");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001156 packet_put_int(nc->self);
Damien Millere7378562001-12-21 14:58:35 +11001157 packet_put_int(nc->local_window_max);
1158 packet_put_int(nc->local_maxpacket);
Damien Millerd83ff352001-01-30 09:19:34 +11001159 /* originator ipaddr and port */
1160 packet_put_cstring(remote_ipaddr);
Damien Miller30c3d422000-05-09 11:02:59 +10001161 if (datafellows & SSH_BUG_X11FWD) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001162 debug2("ssh2 x11 bug compat mode");
Damien Miller30c3d422000-05-09 11:02:59 +10001163 } else {
1164 packet_put_int(remote_port);
1165 }
Damien Millerbd483e72000-04-30 10:00:53 +10001166 packet_send();
1167 } else {
1168 packet_start(SSH_SMSG_X11_OPEN);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001169 packet_put_int(nc->self);
Ben Lindstrome9c99912001-06-09 00:41:05 +00001170 if (packet_get_protocol_flags() &
1171 SSH_PROTOFLAG_HOST_IN_FWD_OPEN)
Ben Lindstrom664408d2001-06-09 01:42:01 +00001172 packet_put_cstring(buf);
Damien Millerbd483e72000-04-30 10:00:53 +10001173 packet_send();
1174 }
Damien Millerd83ff352001-01-30 09:19:34 +11001175 xfree(remote_ipaddr);
Damien Millerb38eff82000-04-01 11:09:21 +10001176 }
1177}
1178
Ben Lindstrombba81212001-06-25 05:01:22 +00001179static void
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001180port_open_helper(Channel *c, char *rtype)
1181{
1182 int direct;
1183 char buf[1024];
1184 char *remote_ipaddr = get_peer_ipaddr(c->sock);
Damien Miller677257f2005-06-17 12:55:03 +10001185 int remote_port = get_peer_port(c->sock);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001186
1187 direct = (strcmp(rtype, "direct-tcpip") == 0);
1188
1189 snprintf(buf, sizeof buf,
1190 "%s: listening port %d for %.100s port %d, "
1191 "connect from %.200s port %d",
1192 rtype, c->listening_port, c->path, c->host_port,
1193 remote_ipaddr, remote_port);
1194
1195 xfree(c->remote_name);
1196 c->remote_name = xstrdup(buf);
1197
1198 if (compat20) {
1199 packet_start(SSH2_MSG_CHANNEL_OPEN);
1200 packet_put_cstring(rtype);
1201 packet_put_int(c->self);
1202 packet_put_int(c->local_window_max);
1203 packet_put_int(c->local_maxpacket);
1204 if (direct) {
1205 /* target host, port */
1206 packet_put_cstring(c->path);
1207 packet_put_int(c->host_port);
1208 } else {
1209 /* listen address, port */
1210 packet_put_cstring(c->path);
1211 packet_put_int(c->listening_port);
1212 }
1213 /* originator host and port */
1214 packet_put_cstring(remote_ipaddr);
Damien Miller677257f2005-06-17 12:55:03 +10001215 packet_put_int((u_int)remote_port);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001216 packet_send();
1217 } else {
1218 packet_start(SSH_MSG_PORT_OPEN);
1219 packet_put_int(c->self);
1220 packet_put_cstring(c->path);
1221 packet_put_int(c->host_port);
Ben Lindstrome9c99912001-06-09 00:41:05 +00001222 if (packet_get_protocol_flags() &
1223 SSH_PROTOFLAG_HOST_IN_FWD_OPEN)
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001224 packet_put_cstring(c->remote_name);
1225 packet_send();
1226 }
1227 xfree(remote_ipaddr);
1228}
1229
Damien Millerb38eff82000-04-01 11:09:21 +10001230/*
1231 * This socket is listening for connections to a forwarded TCP/IP port.
1232 */
Ben Lindstrombba81212001-06-25 05:01:22 +00001233static void
Damien Millerb38eff82000-04-01 11:09:21 +10001234channel_post_port_listener(Channel *c, fd_set * readset, fd_set * writeset)
1235{
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001236 Channel *nc;
Damien Millerb38eff82000-04-01 11:09:21 +10001237 struct sockaddr addr;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001238 int newsock, nextstate;
Damien Millerb38eff82000-04-01 11:09:21 +10001239 socklen_t addrlen;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001240 char *rtype;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001241
Damien Millerb38eff82000-04-01 11:09:21 +10001242 if (FD_ISSET(c->sock, readset)) {
1243 debug("Connection to port %d forwarding "
1244 "to %.100s port %d requested.",
1245 c->listening_port, c->path, c->host_port);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001246
Damien Miller4623a752001-10-10 15:03:58 +10001247 if (c->type == SSH_CHANNEL_RPORT_LISTENER) {
1248 nextstate = SSH_CHANNEL_OPENING;
1249 rtype = "forwarded-tcpip";
1250 } else {
1251 if (c->host_port == 0) {
1252 nextstate = SSH_CHANNEL_DYNAMIC;
Damien Millerd3c04b92001-10-10 15:04:20 +10001253 rtype = "dynamic-tcpip";
Damien Miller4623a752001-10-10 15:03:58 +10001254 } else {
1255 nextstate = SSH_CHANNEL_OPENING;
1256 rtype = "direct-tcpip";
1257 }
1258 }
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001259
Damien Millerb38eff82000-04-01 11:09:21 +10001260 addrlen = sizeof(addr);
1261 newsock = accept(c->sock, &addr, &addrlen);
1262 if (newsock < 0) {
1263 error("accept: %.100s", strerror(errno));
1264 return;
1265 }
Ben Lindstrom1ebd7a52002-02-26 18:12:51 +00001266 set_nodelay(newsock);
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001267 nc = channel_new(rtype, nextstate, newsock, newsock, -1,
1268 c->local_window_max, c->local_maxpacket, 0, rtype, 1);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001269 nc->listening_port = c->listening_port;
1270 nc->host_port = c->host_port;
1271 strlcpy(nc->path, c->path, sizeof(nc->path));
1272
Damien Miller4623a752001-10-10 15:03:58 +10001273 if (nextstate == SSH_CHANNEL_DYNAMIC) {
1274 /*
1275 * do not call the channel_post handler until
1276 * this flag has been reset by a pre-handler.
1277 * otherwise the FD_ISSET calls might overflow
1278 */
1279 nc->delayed = 1;
1280 } else {
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001281 port_open_helper(nc, rtype);
Damien Miller4623a752001-10-10 15:03:58 +10001282 }
Damien Millerb38eff82000-04-01 11:09:21 +10001283 }
1284}
1285
1286/*
1287 * This is the authentication agent socket listening for connections from
1288 * clients.
1289 */
Ben Lindstrombba81212001-06-25 05:01:22 +00001290static void
Damien Millerb38eff82000-04-01 11:09:21 +10001291channel_post_auth_listener(Channel *c, fd_set * readset, fd_set * writeset)
1292{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001293 Channel *nc;
1294 int newsock;
Damien Millerb38eff82000-04-01 11:09:21 +10001295 struct sockaddr addr;
Damien Millerb38eff82000-04-01 11:09:21 +10001296 socklen_t addrlen;
1297
1298 if (FD_ISSET(c->sock, readset)) {
1299 addrlen = sizeof(addr);
1300 newsock = accept(c->sock, &addr, &addrlen);
1301 if (newsock < 0) {
1302 error("accept from auth socket: %.100s", strerror(errno));
1303 return;
1304 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001305 nc = channel_new("accepted auth socket",
Damien Miller0bc1bd82000-11-13 22:57:25 +11001306 SSH_CHANNEL_OPENING, newsock, newsock, -1,
1307 c->local_window_max, c->local_maxpacket,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001308 0, "accepted auth socket", 1);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001309 if (compat20) {
1310 packet_start(SSH2_MSG_CHANNEL_OPEN);
1311 packet_put_cstring("auth-agent@openssh.com");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001312 packet_put_int(nc->self);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001313 packet_put_int(c->local_window_max);
1314 packet_put_int(c->local_maxpacket);
1315 } else {
1316 packet_start(SSH_SMSG_AGENT_OPEN);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001317 packet_put_int(nc->self);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001318 }
Damien Millerb38eff82000-04-01 11:09:21 +10001319 packet_send();
1320 }
1321}
1322
Ben Lindstrombba81212001-06-25 05:01:22 +00001323static void
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001324channel_post_connecting(Channel *c, fd_set * readset, fd_set * writeset)
1325{
Ben Lindstrom69128662001-05-08 20:07:39 +00001326 int err = 0;
Ben Lindstrom11180952001-07-04 05:13:35 +00001327 socklen_t sz = sizeof(err);
Ben Lindstrom69128662001-05-08 20:07:39 +00001328
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001329 if (FD_ISSET(c->sock, writeset)) {
Ben Lindstrom733a2352002-03-05 01:31:28 +00001330 if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, &err, &sz) < 0) {
Ben Lindstrom69128662001-05-08 20:07:39 +00001331 err = errno;
1332 error("getsockopt SO_ERROR failed");
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001333 }
Ben Lindstrom69128662001-05-08 20:07:39 +00001334 if (err == 0) {
1335 debug("channel %d: connected", c->self);
1336 c->type = SSH_CHANNEL_OPEN;
1337 if (compat20) {
1338 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1339 packet_put_int(c->remote_id);
1340 packet_put_int(c->self);
1341 packet_put_int(c->local_window);
1342 packet_put_int(c->local_maxpacket);
1343 } else {
1344 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1345 packet_put_int(c->remote_id);
1346 packet_put_int(c->self);
1347 }
1348 } else {
1349 debug("channel %d: not connected: %s",
1350 c->self, strerror(err));
1351 if (compat20) {
1352 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1353 packet_put_int(c->remote_id);
1354 packet_put_int(SSH2_OPEN_CONNECT_FAILED);
1355 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1356 packet_put_cstring(strerror(err));
1357 packet_put_cstring("");
1358 }
1359 } else {
1360 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1361 packet_put_int(c->remote_id);
1362 }
1363 chan_mark_dead(c);
1364 }
1365 packet_send();
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001366 }
1367}
1368
Ben Lindstrombba81212001-06-25 05:01:22 +00001369static int
Damien Millerb38eff82000-04-01 11:09:21 +10001370channel_handle_rfd(Channel *c, fd_set * readset, fd_set * writeset)
1371{
Darren Tucker11327cc2005-03-14 23:22:25 +11001372 char buf[CHAN_RBUF];
Damien Millerb38eff82000-04-01 11:09:21 +10001373 int len;
1374
Ben Lindstromc0dee1a2001-06-05 20:52:50 +00001375 if (c->rfd != -1 &&
Damien Millerb38eff82000-04-01 11:09:21 +10001376 FD_ISSET(c->rfd, readset)) {
1377 len = read(c->rfd, buf, sizeof(buf));
Damien Miller6f83b8e2000-05-02 09:23:45 +10001378 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1379 return 1;
Damien Millerb38eff82000-04-01 11:09:21 +10001380 if (len <= 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001381 debug2("channel %d: read<=0 rfd %d len %d",
Damien Millerb38eff82000-04-01 11:09:21 +10001382 c->self, c->rfd, len);
Ben Lindstromb3921512001-04-11 15:57:50 +00001383 if (c->type != SSH_CHANNEL_OPEN) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001384 debug2("channel %d: not open", c->self);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001385 chan_mark_dead(c);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001386 return -1;
Ben Lindstromb3921512001-04-11 15:57:50 +00001387 } else if (compat13) {
Damien Miller76765c02002-01-22 23:21:15 +11001388 buffer_clear(&c->output);
Damien Millerb38eff82000-04-01 11:09:21 +10001389 c->type = SSH_CHANNEL_INPUT_DRAINING;
Damien Millerfbdeece2003-09-02 22:52:31 +10001390 debug2("channel %d: input draining.", c->self);
Damien Millerb38eff82000-04-01 11:09:21 +10001391 } else {
1392 chan_read_failed(c);
1393 }
1394 return -1;
1395 }
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00001396 if (c->input_filter != NULL) {
Damien Millerad833b32000-08-23 10:46:23 +10001397 if (c->input_filter(c, buf, len) == -1) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001398 debug2("channel %d: filter stops", c->self);
Damien Millerad833b32000-08-23 10:46:23 +10001399 chan_read_failed(c);
1400 }
1401 } else {
1402 buffer_append(&c->input, buf, len);
1403 }
Damien Millerb38eff82000-04-01 11:09:21 +10001404 }
1405 return 1;
1406}
Ben Lindstrombba81212001-06-25 05:01:22 +00001407static int
Damien Millerb38eff82000-04-01 11:09:21 +10001408channel_handle_wfd(Channel *c, fd_set * readset, fd_set * writeset)
1409{
Ben Lindstrome229b252001-03-05 06:28:06 +00001410 struct termios tio;
Ben Lindstrom6d218f42001-09-18 05:53:12 +00001411 u_char *data;
1412 u_int dlen;
Damien Millerb38eff82000-04-01 11:09:21 +10001413 int len;
1414
1415 /* Send buffered output data to the socket. */
Ben Lindstromc0dee1a2001-06-05 20:52:50 +00001416 if (c->wfd != -1 &&
Damien Millerb38eff82000-04-01 11:09:21 +10001417 FD_ISSET(c->wfd, writeset) &&
1418 buffer_len(&c->output) > 0) {
Ben Lindstrom6d218f42001-09-18 05:53:12 +00001419 data = buffer_ptr(&c->output);
1420 dlen = buffer_len(&c->output);
Ben Lindstrom92ea0ea2002-07-04 18:11:09 +00001421#ifdef _AIX
Damien Millera8e06ce2003-11-21 23:48:55 +11001422 /* XXX: Later AIX versions can't push as much data to tty */
Darren Tucker240fdfa2003-11-22 14:10:02 +11001423 if (compat20 && c->wfd_isatty)
1424 dlen = MIN(dlen, 8*1024);
Ben Lindstrom92ea0ea2002-07-04 18:11:09 +00001425#endif
Ben Lindstrombeb5f332002-07-22 15:28:53 +00001426 len = write(c->wfd, data, dlen);
Damien Miller6f83b8e2000-05-02 09:23:45 +10001427 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1428 return 1;
Damien Millerb38eff82000-04-01 11:09:21 +10001429 if (len <= 0) {
Ben Lindstromb3921512001-04-11 15:57:50 +00001430 if (c->type != SSH_CHANNEL_OPEN) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001431 debug2("channel %d: not open", c->self);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001432 chan_mark_dead(c);
Ben Lindstromb3921512001-04-11 15:57:50 +00001433 return -1;
1434 } else if (compat13) {
Damien Miller76765c02002-01-22 23:21:15 +11001435 buffer_clear(&c->output);
Damien Millerfbdeece2003-09-02 22:52:31 +10001436 debug2("channel %d: input draining.", c->self);
Damien Millerb38eff82000-04-01 11:09:21 +10001437 c->type = SSH_CHANNEL_INPUT_DRAINING;
1438 } else {
1439 chan_write_failed(c);
1440 }
1441 return -1;
1442 }
Ben Lindstrom6d218f42001-09-18 05:53:12 +00001443 if (compat20 && c->isatty && dlen >= 1 && data[0] != '\r') {
Damien Miller79438cc2001-02-16 12:34:57 +11001444 if (tcgetattr(c->wfd, &tio) == 0 &&
1445 !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) {
1446 /*
1447 * Simulate echo to reduce the impact of
Ben Lindstromb40204b2001-03-05 06:29:44 +00001448 * traffic analysis. We need to match the
Ben Lindstrome229b252001-03-05 06:28:06 +00001449 * size of a SSH2_MSG_CHANNEL_DATA message
1450 * (4 byte channel id + data)
Damien Miller79438cc2001-02-16 12:34:57 +11001451 */
Ben Lindstrome229b252001-03-05 06:28:06 +00001452 packet_send_ignore(4 + len);
Damien Miller79438cc2001-02-16 12:34:57 +11001453 packet_send();
Damien Miller79438cc2001-02-16 12:34:57 +11001454 }
1455 }
Damien Millerb38eff82000-04-01 11:09:21 +10001456 buffer_consume(&c->output, len);
Damien Miller33b13562000-04-04 14:38:59 +10001457 if (compat20 && len > 0) {
1458 c->local_consumed += len;
1459 }
1460 }
1461 return 1;
1462}
Ben Lindstrombba81212001-06-25 05:01:22 +00001463static int
Damien Miller33b13562000-04-04 14:38:59 +10001464channel_handle_efd(Channel *c, fd_set * readset, fd_set * writeset)
1465{
Darren Tucker11327cc2005-03-14 23:22:25 +11001466 char buf[CHAN_RBUF];
Damien Miller33b13562000-04-04 14:38:59 +10001467 int len;
1468
Damien Miller1383bd82000-04-06 12:32:37 +10001469/** XXX handle drain efd, too */
Damien Miller33b13562000-04-04 14:38:59 +10001470 if (c->efd != -1) {
1471 if (c->extended_usage == CHAN_EXTENDED_WRITE &&
1472 FD_ISSET(c->efd, writeset) &&
1473 buffer_len(&c->extended) > 0) {
1474 len = write(c->efd, buffer_ptr(&c->extended),
1475 buffer_len(&c->extended));
Damien Millerd3444942000-09-30 14:20:03 +11001476 debug2("channel %d: written %d to efd %d",
Damien Miller33b13562000-04-04 14:38:59 +10001477 c->self, len, c->efd);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001478 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1479 return 1;
1480 if (len <= 0) {
1481 debug2("channel %d: closing write-efd %d",
1482 c->self, c->efd);
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001483 channel_close_fd(&c->efd);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001484 } else {
Damien Miller33b13562000-04-04 14:38:59 +10001485 buffer_consume(&c->extended, len);
1486 c->local_consumed += len;
1487 }
1488 } else if (c->extended_usage == CHAN_EXTENDED_READ &&
1489 FD_ISSET(c->efd, readset)) {
1490 len = read(c->efd, buf, sizeof(buf));
Damien Millerd3444942000-09-30 14:20:03 +11001491 debug2("channel %d: read %d from efd %d",
Damien Miller9f0f5c62001-12-21 14:45:46 +11001492 c->self, len, c->efd);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001493 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1494 return 1;
1495 if (len <= 0) {
1496 debug2("channel %d: closing read-efd %d",
Damien Miller1383bd82000-04-06 12:32:37 +10001497 c->self, c->efd);
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001498 channel_close_fd(&c->efd);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001499 } else {
Damien Miller33b13562000-04-04 14:38:59 +10001500 buffer_append(&c->extended, buf, len);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001501 }
Damien Miller33b13562000-04-04 14:38:59 +10001502 }
1503 }
1504 return 1;
1505}
Ben Lindstrombba81212001-06-25 05:01:22 +00001506static int
Damien Miller0e220db2004-06-15 10:34:08 +10001507channel_handle_ctl(Channel *c, fd_set * readset, fd_set * writeset)
1508{
1509 char buf[16];
1510 int len;
1511
1512 /* Monitor control fd to detect if the slave client exits */
1513 if (c->ctl_fd != -1 && FD_ISSET(c->ctl_fd, readset)) {
1514 len = read(c->ctl_fd, buf, sizeof(buf));
1515 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1516 return 1;
1517 if (len <= 0) {
1518 debug2("channel %d: ctl read<=0", c->self);
1519 if (c->type != SSH_CHANNEL_OPEN) {
1520 debug2("channel %d: not open", c->self);
1521 chan_mark_dead(c);
1522 return -1;
1523 } else {
1524 chan_read_failed(c);
1525 chan_write_failed(c);
1526 }
1527 return -1;
1528 } else
1529 fatal("%s: unexpected data on ctl fd", __func__);
1530 }
1531 return 1;
1532}
1533static int
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001534channel_check_window(Channel *c)
Damien Miller33b13562000-04-04 14:38:59 +10001535{
Ben Lindstromb3921512001-04-11 15:57:50 +00001536 if (c->type == SSH_CHANNEL_OPEN &&
1537 !(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) &&
Damien Miller33b13562000-04-04 14:38:59 +10001538 c->local_window < c->local_window_max/2 &&
1539 c->local_consumed > 0) {
1540 packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
1541 packet_put_int(c->remote_id);
1542 packet_put_int(c->local_consumed);
1543 packet_send();
Damien Millerd3444942000-09-30 14:20:03 +11001544 debug2("channel %d: window %d sent adjust %d",
Damien Miller33b13562000-04-04 14:38:59 +10001545 c->self, c->local_window,
1546 c->local_consumed);
1547 c->local_window += c->local_consumed;
1548 c->local_consumed = 0;
Damien Millerb38eff82000-04-01 11:09:21 +10001549 }
1550 return 1;
1551}
1552
Ben Lindstrombba81212001-06-25 05:01:22 +00001553static void
Damien Millerde6987c2002-01-22 23:20:40 +11001554channel_post_open(Channel *c, fd_set * readset, fd_set * writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001555{
Damien Miller4623a752001-10-10 15:03:58 +10001556 if (c->delayed)
1557 return;
Damien Millerb38eff82000-04-01 11:09:21 +10001558 channel_handle_rfd(c, readset, writeset);
1559 channel_handle_wfd(c, readset, writeset);
Damien Millerde6987c2002-01-22 23:20:40 +11001560 if (!compat20)
Damien Miller4623a752001-10-10 15:03:58 +10001561 return;
Damien Miller33b13562000-04-04 14:38:59 +10001562 channel_handle_efd(c, readset, writeset);
Damien Miller0e220db2004-06-15 10:34:08 +10001563 channel_handle_ctl(c, readset, writeset);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001564 channel_check_window(c);
Damien Miller33b13562000-04-04 14:38:59 +10001565}
1566
Ben Lindstrombba81212001-06-25 05:01:22 +00001567static void
Damien Millerb38eff82000-04-01 11:09:21 +10001568channel_post_output_drain_13(Channel *c, fd_set * readset, fd_set * writeset)
1569{
1570 int len;
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +00001571
Damien Millerb38eff82000-04-01 11:09:21 +10001572 /* Send buffered output data to the socket. */
1573 if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) {
1574 len = write(c->sock, buffer_ptr(&c->output),
1575 buffer_len(&c->output));
1576 if (len <= 0)
Damien Miller76765c02002-01-22 23:21:15 +11001577 buffer_clear(&c->output);
Damien Millerb38eff82000-04-01 11:09:21 +10001578 else
1579 buffer_consume(&c->output, len);
1580 }
1581}
1582
Ben Lindstrombba81212001-06-25 05:01:22 +00001583static void
Damien Miller33b13562000-04-04 14:38:59 +10001584channel_handler_init_20(void)
1585{
Damien Millerde6987c2002-01-22 23:20:40 +11001586 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open;
Damien Millerbd483e72000-04-30 10:00:53 +10001587 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open;
Damien Miller33b13562000-04-04 14:38:59 +10001588 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001589 channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener;
Damien Millerbd483e72000-04-30 10:00:53 +10001590 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001591 channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001592 channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001593 channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
Damien Miller33b13562000-04-04 14:38:59 +10001594
Damien Millerde6987c2002-01-22 23:20:40 +11001595 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open;
Damien Miller33b13562000-04-04 14:38:59 +10001596 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001597 channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener;
Damien Millerbd483e72000-04-30 10:00:53 +10001598 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001599 channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001600 channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
Damien Millerde6987c2002-01-22 23:20:40 +11001601 channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open;
Damien Miller33b13562000-04-04 14:38:59 +10001602}
1603
Ben Lindstrombba81212001-06-25 05:01:22 +00001604static void
Damien Millerb38eff82000-04-01 11:09:21 +10001605channel_handler_init_13(void)
1606{
1607 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13;
1608 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_13;
1609 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
1610 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
1611 channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
1612 channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining;
1613 channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001614 channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001615 channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
Damien Millerb38eff82000-04-01 11:09:21 +10001616
Damien Millerde6987c2002-01-22 23:20:40 +11001617 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open;
Damien Millerb38eff82000-04-01 11:09:21 +10001618 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
1619 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
1620 channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
1621 channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001622 channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
Damien Millerde6987c2002-01-22 23:20:40 +11001623 channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open;
Damien Millerb38eff82000-04-01 11:09:21 +10001624}
1625
Ben Lindstrombba81212001-06-25 05:01:22 +00001626static void
Damien Millerb38eff82000-04-01 11:09:21 +10001627channel_handler_init_15(void)
1628{
Damien Millerde6987c2002-01-22 23:20:40 +11001629 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open;
Damien Millerbd483e72000-04-30 10:00:53 +10001630 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open;
Damien Millerb38eff82000-04-01 11:09:21 +10001631 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
1632 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
1633 channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001634 channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001635 channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
Damien Millerb38eff82000-04-01 11:09:21 +10001636
1637 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
1638 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
1639 channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
Damien Millerde6987c2002-01-22 23:20:40 +11001640 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001641 channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
Damien Millerde6987c2002-01-22 23:20:40 +11001642 channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open;
Damien Millerb38eff82000-04-01 11:09:21 +10001643}
1644
Ben Lindstrombba81212001-06-25 05:01:22 +00001645static void
Damien Millerb38eff82000-04-01 11:09:21 +10001646channel_handler_init(void)
1647{
1648 int i;
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +00001649
Damien Miller9f0f5c62001-12-21 14:45:46 +11001650 for (i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) {
Damien Millerb38eff82000-04-01 11:09:21 +10001651 channel_pre[i] = NULL;
1652 channel_post[i] = NULL;
1653 }
Damien Miller33b13562000-04-04 14:38:59 +10001654 if (compat20)
1655 channel_handler_init_20();
1656 else if (compat13)
Damien Millerb38eff82000-04-01 11:09:21 +10001657 channel_handler_init_13();
1658 else
1659 channel_handler_init_15();
1660}
1661
Damien Miller3ec27592001-10-12 11:35:04 +10001662/* gc dead channels */
1663static void
1664channel_garbage_collect(Channel *c)
1665{
1666 if (c == NULL)
1667 return;
1668 if (c->detach_user != NULL) {
1669 if (!chan_is_dead(c, 0))
1670 return;
Damien Millerfbdeece2003-09-02 22:52:31 +10001671 debug2("channel %d: gc: notify user", c->self);
Damien Miller3ec27592001-10-12 11:35:04 +10001672 c->detach_user(c->self, NULL);
1673 /* if we still have a callback */
1674 if (c->detach_user != NULL)
1675 return;
Damien Millerfbdeece2003-09-02 22:52:31 +10001676 debug2("channel %d: gc: user detached", c->self);
Damien Miller3ec27592001-10-12 11:35:04 +10001677 }
1678 if (!chan_is_dead(c, 1))
1679 return;
Damien Millerfbdeece2003-09-02 22:52:31 +10001680 debug2("channel %d: garbage collecting", c->self);
Damien Miller3ec27592001-10-12 11:35:04 +10001681 channel_free(c);
1682}
1683
Ben Lindstrombba81212001-06-25 05:01:22 +00001684static void
Damien Millerb38eff82000-04-01 11:09:21 +10001685channel_handler(chan_fn *ftab[], fd_set * readset, fd_set * writeset)
1686{
1687 static int did_init = 0;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10001688 u_int i;
Damien Millerb38eff82000-04-01 11:09:21 +10001689 Channel *c;
1690
1691 if (!did_init) {
1692 channel_handler_init();
1693 did_init = 1;
1694 }
1695 for (i = 0; i < channels_alloc; i++) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001696 c = channels[i];
1697 if (c == NULL)
Damien Millerb38eff82000-04-01 11:09:21 +10001698 continue;
Ben Lindstromc0dee1a2001-06-05 20:52:50 +00001699 if (ftab[c->type] != NULL)
1700 (*ftab[c->type])(c, readset, writeset);
Damien Miller3ec27592001-10-12 11:35:04 +10001701 channel_garbage_collect(c);
Damien Millerb38eff82000-04-01 11:09:21 +10001702 }
1703}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001704
Ben Lindstrome9c99912001-06-09 00:41:05 +00001705/*
1706 * Allocate/update select bitmasks and add any bits relevant to channels in
1707 * select bitmasks.
1708 */
Damien Miller4af51302000-04-16 11:18:38 +10001709void
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001710channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp,
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10001711 u_int *nallocp, int rekeying)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001712{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10001713 u_int n, sz;
Damien Miller5e953212001-01-30 09:14:00 +11001714
1715 n = MAX(*maxfdp, channel_max_fd);
1716
1717 sz = howmany(n+1, NFDBITS) * sizeof(fd_mask);
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001718 /* perhaps check sz < nalloc/2 and shrink? */
1719 if (*readsetp == NULL || sz > *nallocp) {
1720 *readsetp = xrealloc(*readsetp, sz);
1721 *writesetp = xrealloc(*writesetp, sz);
1722 *nallocp = sz;
Damien Miller5e953212001-01-30 09:14:00 +11001723 }
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001724 *maxfdp = n;
Damien Miller5e953212001-01-30 09:14:00 +11001725 memset(*readsetp, 0, sz);
1726 memset(*writesetp, 0, sz);
1727
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001728 if (!rekeying)
1729 channel_handler(channel_pre, *readsetp, *writesetp);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001730}
1731
Ben Lindstrome9c99912001-06-09 00:41:05 +00001732/*
1733 * After select, perform any appropriate operations for channels which have
1734 * events pending.
1735 */
Damien Miller4af51302000-04-16 11:18:38 +10001736void
Damien Miller95def091999-11-25 00:26:21 +11001737channel_after_select(fd_set * readset, fd_set * writeset)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001738{
Damien Millerb38eff82000-04-01 11:09:21 +10001739 channel_handler(channel_post, readset, writeset);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001740}
1741
Ben Lindstrome9c99912001-06-09 00:41:05 +00001742
Damien Miller5e953212001-01-30 09:14:00 +11001743/* If there is data to send to the connection, enqueue some of it now. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001744
Damien Miller4af51302000-04-16 11:18:38 +10001745void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00001746channel_output_poll(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001747{
Damien Millerb38eff82000-04-01 11:09:21 +10001748 Channel *c;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10001749 u_int i, len;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001750
Damien Miller95def091999-11-25 00:26:21 +11001751 for (i = 0; i < channels_alloc; i++) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001752 c = channels[i];
1753 if (c == NULL)
1754 continue;
Damien Miller34132e52000-01-14 15:45:46 +11001755
Ben Lindstrome9c99912001-06-09 00:41:05 +00001756 /*
1757 * We are only interested in channels that can have buffered
1758 * incoming data.
1759 */
Damien Miller34132e52000-01-14 15:45:46 +11001760 if (compat13) {
Damien Millerb38eff82000-04-01 11:09:21 +10001761 if (c->type != SSH_CHANNEL_OPEN &&
1762 c->type != SSH_CHANNEL_INPUT_DRAINING)
Damien Miller34132e52000-01-14 15:45:46 +11001763 continue;
1764 } else {
Damien Millerb38eff82000-04-01 11:09:21 +10001765 if (c->type != SSH_CHANNEL_OPEN)
Damien Miller34132e52000-01-14 15:45:46 +11001766 continue;
Damien Miller34132e52000-01-14 15:45:46 +11001767 }
Damien Millerefb4afe2000-04-12 18:45:05 +10001768 if (compat20 &&
1769 (c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) {
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001770 /* XXX is this true? */
Damien Miller3ec27592001-10-12 11:35:04 +10001771 debug3("channel %d: will not send data after close", c->self);
Damien Miller33b13562000-04-04 14:38:59 +10001772 continue;
1773 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001774
Damien Miller95def091999-11-25 00:26:21 +11001775 /* Get the amount of buffered data for this channel. */
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001776 if ((c->istate == CHAN_INPUT_OPEN ||
1777 c->istate == CHAN_INPUT_WAIT_DRAIN) &&
1778 (len = buffer_len(&c->input)) > 0) {
Ben Lindstrome9c99912001-06-09 00:41:05 +00001779 /*
1780 * Send some data for the other side over the secure
1781 * connection.
1782 */
Damien Miller33b13562000-04-04 14:38:59 +10001783 if (compat20) {
1784 if (len > c->remote_window)
1785 len = c->remote_window;
1786 if (len > c->remote_maxpacket)
1787 len = c->remote_maxpacket;
Damien Miller95def091999-11-25 00:26:21 +11001788 } else {
Damien Miller33b13562000-04-04 14:38:59 +10001789 if (packet_is_interactive()) {
1790 if (len > 1024)
1791 len = 512;
1792 } else {
1793 /* Keep the packets at reasonable size. */
1794 if (len > packet_get_maxsize()/2)
1795 len = packet_get_maxsize()/2;
1796 }
Damien Miller95def091999-11-25 00:26:21 +11001797 }
Damien Millerb38eff82000-04-01 11:09:21 +10001798 if (len > 0) {
Damien Miller33b13562000-04-04 14:38:59 +10001799 packet_start(compat20 ?
1800 SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA);
Damien Millerb38eff82000-04-01 11:09:21 +10001801 packet_put_int(c->remote_id);
1802 packet_put_string(buffer_ptr(&c->input), len);
1803 packet_send();
1804 buffer_consume(&c->input, len);
1805 c->remote_window -= len;
Damien Millerb38eff82000-04-01 11:09:21 +10001806 }
1807 } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) {
Damien Miller95def091999-11-25 00:26:21 +11001808 if (compat13)
1809 fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3");
Damien Miller5428f641999-11-25 11:54:57 +11001810 /*
1811 * input-buffer is empty and read-socket shutdown:
Ben Lindstromcf159442002-03-26 03:26:24 +00001812 * tell peer, that we will not send more data: send IEOF.
1813 * hack for extended data: delay EOF if EFD still in use.
Damien Miller5428f641999-11-25 11:54:57 +11001814 */
Ben Lindstromcf159442002-03-26 03:26:24 +00001815 if (CHANNEL_EFD_INPUT_ACTIVE(c))
Damien Miller0dc1bef2005-07-17 17:22:45 +10001816 debug2("channel %d: ibuf_empty delayed efd %d/(%d)",
1817 c->self, c->efd, buffer_len(&c->extended));
Ben Lindstromcf159442002-03-26 03:26:24 +00001818 else
1819 chan_ibuf_empty(c);
Damien Miller95def091999-11-25 00:26:21 +11001820 }
Damien Miller33b13562000-04-04 14:38:59 +10001821 /* Send extended data, i.e. stderr */
1822 if (compat20 &&
Ben Lindstromcf159442002-03-26 03:26:24 +00001823 !(c->flags & CHAN_EOF_SENT) &&
Damien Miller33b13562000-04-04 14:38:59 +10001824 c->remote_window > 0 &&
1825 (len = buffer_len(&c->extended)) > 0 &&
1826 c->extended_usage == CHAN_EXTENDED_READ) {
Ben Lindstrom4fed2be2002-06-25 23:17:36 +00001827 debug2("channel %d: rwin %u elen %u euse %d",
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001828 c->self, c->remote_window, buffer_len(&c->extended),
1829 c->extended_usage);
Damien Miller33b13562000-04-04 14:38:59 +10001830 if (len > c->remote_window)
1831 len = c->remote_window;
1832 if (len > c->remote_maxpacket)
1833 len = c->remote_maxpacket;
1834 packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA);
1835 packet_put_int(c->remote_id);
1836 packet_put_int(SSH2_EXTENDED_DATA_STDERR);
1837 packet_put_string(buffer_ptr(&c->extended), len);
1838 packet_send();
1839 buffer_consume(&c->extended, len);
1840 c->remote_window -= len;
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001841 debug2("channel %d: sent ext data %d", c->self, len);
Damien Miller33b13562000-04-04 14:38:59 +10001842 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001843 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001844}
1845
Ben Lindstrome9c99912001-06-09 00:41:05 +00001846
1847/* -- protocol input */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001848
Damien Miller4af51302000-04-16 11:18:38 +10001849void
Damien Miller630d6f42002-01-22 23:17:30 +11001850channel_input_data(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001851{
Damien Miller34132e52000-01-14 15:45:46 +11001852 int id;
Damien Miller95def091999-11-25 00:26:21 +11001853 char *data;
Ben Lindstrom46c16222000-12-22 01:43:59 +00001854 u_int data_len;
Damien Millerb38eff82000-04-01 11:09:21 +10001855 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001856
Damien Miller95def091999-11-25 00:26:21 +11001857 /* Get the channel number and verify it. */
Damien Miller34132e52000-01-14 15:45:46 +11001858 id = packet_get_int();
Damien Millerb38eff82000-04-01 11:09:21 +10001859 c = channel_lookup(id);
1860 if (c == NULL)
Damien Miller34132e52000-01-14 15:45:46 +11001861 packet_disconnect("Received data for nonexistent channel %d.", id);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001862
Damien Miller95def091999-11-25 00:26:21 +11001863 /* Ignore any data for non-open channels (might happen on close) */
Damien Millerb38eff82000-04-01 11:09:21 +10001864 if (c->type != SSH_CHANNEL_OPEN &&
1865 c->type != SSH_CHANNEL_X11_OPEN)
Damien Miller34132e52000-01-14 15:45:46 +11001866 return;
1867
Damien Miller95def091999-11-25 00:26:21 +11001868 /* Get the data. */
1869 data = packet_get_string(&data_len);
Damien Millerb38eff82000-04-01 11:09:21 +10001870
Damien Millera04ad492004-01-21 11:02:09 +11001871 /*
1872 * Ignore data for protocol > 1.3 if output end is no longer open.
1873 * For protocol 2 the sending side is reducing its window as it sends
1874 * data, so we must 'fake' consumption of the data in order to ensure
1875 * that window updates are sent back. Otherwise the connection might
1876 * deadlock.
1877 */
1878 if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN) {
1879 if (compat20) {
1880 c->local_window -= data_len;
1881 c->local_consumed += data_len;
1882 }
1883 xfree(data);
1884 return;
1885 }
1886
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00001887 if (compat20) {
Damien Miller33b13562000-04-04 14:38:59 +10001888 if (data_len > c->local_maxpacket) {
Damien Miller996acd22003-04-09 20:59:48 +10001889 logit("channel %d: rcvd big packet %d, maxpack %d",
Damien Miller33b13562000-04-04 14:38:59 +10001890 c->self, data_len, c->local_maxpacket);
1891 }
1892 if (data_len > c->local_window) {
Damien Miller996acd22003-04-09 20:59:48 +10001893 logit("channel %d: rcvd too much data %d, win %d",
Damien Miller33b13562000-04-04 14:38:59 +10001894 c->self, data_len, c->local_window);
1895 xfree(data);
1896 return;
1897 }
1898 c->local_window -= data_len;
Damien Miller33b13562000-04-04 14:38:59 +10001899 }
Damien Miller48b03fc2002-01-22 23:11:40 +11001900 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10001901 buffer_append(&c->output, data, data_len);
Damien Miller95def091999-11-25 00:26:21 +11001902 xfree(data);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001903}
Ben Lindstrome9c99912001-06-09 00:41:05 +00001904
Damien Miller4af51302000-04-16 11:18:38 +10001905void
Damien Miller630d6f42002-01-22 23:17:30 +11001906channel_input_extended_data(int type, u_int32_t seq, void *ctxt)
Damien Miller33b13562000-04-04 14:38:59 +10001907{
1908 int id;
Damien Miller33b13562000-04-04 14:38:59 +10001909 char *data;
Ben Lindstromdaa21792002-06-25 23:15:30 +00001910 u_int data_len, tcode;
Damien Miller33b13562000-04-04 14:38:59 +10001911 Channel *c;
1912
1913 /* Get the channel number and verify it. */
1914 id = packet_get_int();
1915 c = channel_lookup(id);
1916
1917 if (c == NULL)
1918 packet_disconnect("Received extended_data for bad channel %d.", id);
1919 if (c->type != SSH_CHANNEL_OPEN) {
Damien Miller996acd22003-04-09 20:59:48 +10001920 logit("channel %d: ext data for non open", id);
Damien Miller33b13562000-04-04 14:38:59 +10001921 return;
1922 }
Ben Lindstromcf159442002-03-26 03:26:24 +00001923 if (c->flags & CHAN_EOF_RCVD) {
1924 if (datafellows & SSH_BUG_EXTEOF)
1925 debug("channel %d: accepting ext data after eof", id);
1926 else
1927 packet_disconnect("Received extended_data after EOF "
1928 "on channel %d.", id);
1929 }
Damien Miller33b13562000-04-04 14:38:59 +10001930 tcode = packet_get_int();
1931 if (c->efd == -1 ||
1932 c->extended_usage != CHAN_EXTENDED_WRITE ||
1933 tcode != SSH2_EXTENDED_DATA_STDERR) {
Damien Miller996acd22003-04-09 20:59:48 +10001934 logit("channel %d: bad ext data", c->self);
Damien Miller33b13562000-04-04 14:38:59 +10001935 return;
1936 }
1937 data = packet_get_string(&data_len);
Damien Miller48b03fc2002-01-22 23:11:40 +11001938 packet_check_eom();
Damien Miller33b13562000-04-04 14:38:59 +10001939 if (data_len > c->local_window) {
Damien Miller996acd22003-04-09 20:59:48 +10001940 logit("channel %d: rcvd too much extended_data %d, win %d",
Damien Miller33b13562000-04-04 14:38:59 +10001941 c->self, data_len, c->local_window);
1942 xfree(data);
1943 return;
1944 }
Damien Millerd3444942000-09-30 14:20:03 +11001945 debug2("channel %d: rcvd ext data %d", c->self, data_len);
Damien Miller33b13562000-04-04 14:38:59 +10001946 c->local_window -= data_len;
1947 buffer_append(&c->extended, data, data_len);
1948 xfree(data);
1949}
1950
Damien Miller4af51302000-04-16 11:18:38 +10001951void
Damien Miller630d6f42002-01-22 23:17:30 +11001952channel_input_ieof(int type, u_int32_t seq, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10001953{
1954 int id;
1955 Channel *c;
1956
Damien Millerb38eff82000-04-01 11:09:21 +10001957 id = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11001958 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10001959 c = channel_lookup(id);
1960 if (c == NULL)
1961 packet_disconnect("Received ieof for nonexistent channel %d.", id);
1962 chan_rcvd_ieof(c);
Ben Lindstrom944c4f02001-09-18 05:51:13 +00001963
1964 /* XXX force input close */
Damien Millera90fc082002-01-22 23:19:38 +11001965 if (c->force_drain && c->istate == CHAN_INPUT_OPEN) {
Ben Lindstrom944c4f02001-09-18 05:51:13 +00001966 debug("channel %d: FORCE input drain", c->self);
1967 c->istate = CHAN_INPUT_WAIT_DRAIN;
Damien Miller73f10742002-01-22 23:34:52 +11001968 if (buffer_len(&c->input) == 0)
1969 chan_ibuf_empty(c);
Ben Lindstrom944c4f02001-09-18 05:51:13 +00001970 }
1971
Damien Millerb38eff82000-04-01 11:09:21 +10001972}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001973
Damien Miller4af51302000-04-16 11:18:38 +10001974void
Damien Miller630d6f42002-01-22 23:17:30 +11001975channel_input_close(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001976{
Damien Millerb38eff82000-04-01 11:09:21 +10001977 int id;
1978 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001979
Damien Millerb38eff82000-04-01 11:09:21 +10001980 id = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11001981 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10001982 c = channel_lookup(id);
1983 if (c == NULL)
1984 packet_disconnect("Received close for nonexistent channel %d.", id);
Damien Miller5428f641999-11-25 11:54:57 +11001985
1986 /*
1987 * Send a confirmation that we have closed the channel and no more
1988 * data is coming for it.
1989 */
Damien Miller95def091999-11-25 00:26:21 +11001990 packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION);
Damien Millerb38eff82000-04-01 11:09:21 +10001991 packet_put_int(c->remote_id);
Damien Miller95def091999-11-25 00:26:21 +11001992 packet_send();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001993
Damien Miller5428f641999-11-25 11:54:57 +11001994 /*
1995 * If the channel is in closed state, we have sent a close request,
1996 * and the other side will eventually respond with a confirmation.
1997 * Thus, we cannot free the channel here, because then there would be
1998 * no-one to receive the confirmation. The channel gets freed when
1999 * the confirmation arrives.
2000 */
Damien Millerb38eff82000-04-01 11:09:21 +10002001 if (c->type != SSH_CHANNEL_CLOSED) {
Damien Miller5428f641999-11-25 11:54:57 +11002002 /*
2003 * Not a closed channel - mark it as draining, which will
2004 * cause it to be freed later.
2005 */
Damien Miller76765c02002-01-22 23:21:15 +11002006 buffer_clear(&c->input);
Damien Millerb38eff82000-04-01 11:09:21 +10002007 c->type = SSH_CHANNEL_OUTPUT_DRAINING;
Damien Miller95def091999-11-25 00:26:21 +11002008 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002009}
2010
Damien Millerb38eff82000-04-01 11:09:21 +10002011/* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */
Damien Miller4af51302000-04-16 11:18:38 +10002012void
Damien Miller630d6f42002-01-22 23:17:30 +11002013channel_input_oclose(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002014{
Damien Millerb38eff82000-04-01 11:09:21 +10002015 int id = packet_get_int();
2016 Channel *c = channel_lookup(id);
Damien Miller66823cd2002-01-22 23:11:38 +11002017
Damien Miller48b03fc2002-01-22 23:11:40 +11002018 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10002019 if (c == NULL)
2020 packet_disconnect("Received oclose for nonexistent channel %d.", id);
2021 chan_rcvd_oclose(c);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002022}
2023
Damien Miller4af51302000-04-16 11:18:38 +10002024void
Damien Miller630d6f42002-01-22 23:17:30 +11002025channel_input_close_confirmation(int type, u_int32_t seq, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10002026{
2027 int id = packet_get_int();
2028 Channel *c = channel_lookup(id);
2029
Damien Miller48b03fc2002-01-22 23:11:40 +11002030 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10002031 if (c == NULL)
2032 packet_disconnect("Received close confirmation for "
2033 "out-of-range channel %d.", id);
2034 if (c->type != SSH_CHANNEL_CLOSED)
2035 packet_disconnect("Received close confirmation for "
2036 "non-closed channel %d (type %d).", id, c->type);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002037 channel_free(c);
Damien Millerb38eff82000-04-01 11:09:21 +10002038}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002039
Damien Miller4af51302000-04-16 11:18:38 +10002040void
Damien Miller630d6f42002-01-22 23:17:30 +11002041channel_input_open_confirmation(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002042{
Damien Millerb38eff82000-04-01 11:09:21 +10002043 int id, remote_id;
2044 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);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002048
Damien Millerb38eff82000-04-01 11:09:21 +10002049 if (c==NULL || c->type != SSH_CHANNEL_OPENING)
2050 packet_disconnect("Received open confirmation for "
2051 "non-opening channel %d.", id);
2052 remote_id = packet_get_int();
Damien Miller5428f641999-11-25 11:54:57 +11002053 /* Record the remote channel number and mark that the channel is now open. */
Damien Millerb38eff82000-04-01 11:09:21 +10002054 c->remote_id = remote_id;
2055 c->type = SSH_CHANNEL_OPEN;
Damien Miller33b13562000-04-04 14:38:59 +10002056
2057 if (compat20) {
2058 c->remote_window = packet_get_int();
2059 c->remote_maxpacket = packet_get_int();
Damien Miller67f0bc02002-02-05 12:23:08 +11002060 if (c->confirm) {
Damien Millerd3444942000-09-30 14:20:03 +11002061 debug2("callback start");
Damien Miller0e220db2004-06-15 10:34:08 +10002062 c->confirm(c->self, c->confirm_ctx);
Damien Millerd3444942000-09-30 14:20:03 +11002063 debug2("callback done");
Damien Miller33b13562000-04-04 14:38:59 +10002064 }
Damien Millerfbdeece2003-09-02 22:52:31 +10002065 debug2("channel %d: open confirm rwindow %u rmax %u", c->self,
Damien Miller33b13562000-04-04 14:38:59 +10002066 c->remote_window, c->remote_maxpacket);
2067 }
Damien Miller48b03fc2002-01-22 23:11:40 +11002068 packet_check_eom();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002069}
2070
Ben Lindstrombba81212001-06-25 05:01:22 +00002071static char *
Ben Lindstrom69128662001-05-08 20:07:39 +00002072reason2txt(int reason)
2073{
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00002074 switch (reason) {
Ben Lindstrom69128662001-05-08 20:07:39 +00002075 case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED:
2076 return "administratively prohibited";
2077 case SSH2_OPEN_CONNECT_FAILED:
2078 return "connect failed";
2079 case SSH2_OPEN_UNKNOWN_CHANNEL_TYPE:
2080 return "unknown channel type";
2081 case SSH2_OPEN_RESOURCE_SHORTAGE:
2082 return "resource shortage";
2083 }
Ben Lindstrome2595442001-06-05 20:01:39 +00002084 return "unknown reason";
Ben Lindstrom69128662001-05-08 20:07:39 +00002085}
2086
Damien Miller4af51302000-04-16 11:18:38 +10002087void
Damien Miller630d6f42002-01-22 23:17:30 +11002088channel_input_open_failure(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002089{
Kevin Steves12057502001-02-05 14:54:34 +00002090 int id, reason;
2091 char *msg = NULL, *lang = NULL;
Damien Millerb38eff82000-04-01 11:09:21 +10002092 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002093
Damien Millerb38eff82000-04-01 11:09:21 +10002094 id = packet_get_int();
2095 c = channel_lookup(id);
2096
2097 if (c==NULL || c->type != SSH_CHANNEL_OPENING)
2098 packet_disconnect("Received open failure for "
2099 "non-opening channel %d.", id);
Damien Miller33b13562000-04-04 14:38:59 +10002100 if (compat20) {
Kevin Steves12057502001-02-05 14:54:34 +00002101 reason = packet_get_int();
Ben Lindstromf3436742001-04-29 19:52:00 +00002102 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
Kevin Steves12057502001-02-05 14:54:34 +00002103 msg = packet_get_string(NULL);
2104 lang = packet_get_string(NULL);
2105 }
Damien Miller996acd22003-04-09 20:59:48 +10002106 logit("channel %d: open failed: %s%s%s", id,
Ben Lindstrom69128662001-05-08 20:07:39 +00002107 reason2txt(reason), msg ? ": ": "", msg ? msg : "");
Kevin Steves12057502001-02-05 14:54:34 +00002108 if (msg != NULL)
2109 xfree(msg);
2110 if (lang != NULL)
2111 xfree(lang);
Damien Miller33b13562000-04-04 14:38:59 +10002112 }
Damien Miller48b03fc2002-01-22 23:11:40 +11002113 packet_check_eom();
Damien Miller95def091999-11-25 00:26:21 +11002114 /* Free the channel. This will also close the socket. */
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002115 channel_free(c);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002116}
2117
Damien Miller33b13562000-04-04 14:38:59 +10002118void
Damien Miller630d6f42002-01-22 23:17:30 +11002119channel_input_window_adjust(int type, u_int32_t seq, void *ctxt)
Damien Miller33b13562000-04-04 14:38:59 +10002120{
2121 Channel *c;
Ben Lindstrom4fed2be2002-06-25 23:17:36 +00002122 int id;
2123 u_int adjust;
Damien Miller33b13562000-04-04 14:38:59 +10002124
2125 if (!compat20)
2126 return;
2127
2128 /* Get the channel number and verify it. */
2129 id = packet_get_int();
2130 c = channel_lookup(id);
2131
2132 if (c == NULL || c->type != SSH_CHANNEL_OPEN) {
Damien Miller996acd22003-04-09 20:59:48 +10002133 logit("Received window adjust for "
Damien Miller33b13562000-04-04 14:38:59 +10002134 "non-open channel %d.", id);
2135 return;
2136 }
2137 adjust = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11002138 packet_check_eom();
Ben Lindstrom4fed2be2002-06-25 23:17:36 +00002139 debug2("channel %d: rcvd adjust %u", id, adjust);
Damien Miller33b13562000-04-04 14:38:59 +10002140 c->remote_window += adjust;
2141}
2142
Damien Miller4af51302000-04-16 11:18:38 +10002143void
Damien Miller630d6f42002-01-22 23:17:30 +11002144channel_input_port_open(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002145{
Ben Lindstrome9c99912001-06-09 00:41:05 +00002146 Channel *c = NULL;
2147 u_short host_port;
2148 char *host, *originator_string;
2149 int remote_id, sock = -1;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002150
Ben Lindstrome9c99912001-06-09 00:41:05 +00002151 remote_id = packet_get_int();
2152 host = packet_get_string(NULL);
2153 host_port = packet_get_int();
2154
2155 if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) {
2156 originator_string = packet_get_string(NULL);
2157 } else {
2158 originator_string = xstrdup("unknown (remote did not supply name)");
2159 }
Damien Miller48b03fc2002-01-22 23:11:40 +11002160 packet_check_eom();
Ben Lindstrome9c99912001-06-09 00:41:05 +00002161 sock = channel_connect_to(host, host_port);
2162 if (sock != -1) {
2163 c = channel_new("connected socket",
2164 SSH_CHANNEL_CONNECTING, sock, sock, -1, 0, 0, 0,
2165 originator_string, 1);
Damien Miller699d0032002-02-08 22:07:16 +11002166 c->remote_id = remote_id;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002167 }
Damien Millerb1ca8bb2003-05-14 13:45:42 +10002168 xfree(originator_string);
Ben Lindstrome9c99912001-06-09 00:41:05 +00002169 if (c == NULL) {
2170 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
2171 packet_put_int(remote_id);
2172 packet_send();
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002173 }
Ben Lindstrome9c99912001-06-09 00:41:05 +00002174 xfree(host);
Ben Lindstrom5744dc42001-04-13 23:28:01 +00002175}
2176
2177
Ben Lindstrome9c99912001-06-09 00:41:05 +00002178/* -- tcp forwarding */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002179
Ben Lindstrom908afed2001-10-03 17:34:59 +00002180void
2181channel_set_af(int af)
2182{
2183 IPv4or6 = af;
2184}
2185
Damien Millerb16461c2002-01-22 23:29:22 +11002186static int
2187channel_setup_fwd_listener(int type, const char *listen_addr, u_short listen_port,
2188 const char *host_to_connect, u_short port_to_connect, int gateway_ports)
Damien Miller0bc1bd82000-11-13 22:57:25 +11002189{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002190 Channel *c;
Damien Millerf91ee4c2005-03-01 21:24:33 +11002191 int sock, r, success = 0, on = 1, wildcard = 0, is_client;
Damien Miller34132e52000-01-14 15:45:46 +11002192 struct addrinfo hints, *ai, *aitop;
Damien Millerf91ee4c2005-03-01 21:24:33 +11002193 const char *host, *addr;
Damien Millerb16461c2002-01-22 23:29:22 +11002194 char ntop[NI_MAXHOST], strport[NI_MAXSERV];
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002195
Damien Millerb16461c2002-01-22 23:29:22 +11002196 host = (type == SSH_CHANNEL_RPORT_LISTENER) ?
2197 listen_addr : host_to_connect;
Damien Millerf91ee4c2005-03-01 21:24:33 +11002198 is_client = (type == SSH_CHANNEL_PORT_LISTENER);
Kevin Steves12057502001-02-05 14:54:34 +00002199
Damien Millerb16461c2002-01-22 23:29:22 +11002200 if (host == NULL) {
2201 error("No forward host name.");
Damien Millera7270302005-07-06 09:36:05 +10002202 return 0;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002203 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002204 if (strlen(host) > SSH_CHANNEL_PATH_LEN - 1) {
Kevin Steves12057502001-02-05 14:54:34 +00002205 error("Forward host name too long.");
Damien Millera7270302005-07-06 09:36:05 +10002206 return 0;
Kevin Steves12057502001-02-05 14:54:34 +00002207 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002208
Damien Miller5428f641999-11-25 11:54:57 +11002209 /*
Damien Millerf91ee4c2005-03-01 21:24:33 +11002210 * Determine whether or not a port forward listens to loopback,
Darren Tucker47eede72005-03-14 23:08:12 +11002211 * specified address or wildcard. On the client, a specified bind
2212 * address will always override gateway_ports. On the server, a
2213 * gateway_ports of 1 (``yes'') will override the client's
2214 * specification and force a wildcard bind, whereas a value of 2
2215 * (``clientspecified'') will bind to whatever address the client
Damien Millerf91ee4c2005-03-01 21:24:33 +11002216 * asked for.
2217 *
2218 * Special-case listen_addrs are:
2219 *
2220 * "0.0.0.0" -> wildcard v4/v6 if SSH_OLD_FORWARD_ADDR
2221 * "" (empty string), "*" -> wildcard v4/v6
2222 * "localhost" -> loopback v4/v6
2223 */
2224 addr = NULL;
2225 if (listen_addr == NULL) {
2226 /* No address specified: default to gateway_ports setting */
2227 if (gateway_ports)
2228 wildcard = 1;
2229 } else if (gateway_ports || is_client) {
2230 if (((datafellows & SSH_OLD_FORWARD_ADDR) &&
2231 strcmp(listen_addr, "0.0.0.0") == 0) ||
2232 *listen_addr == '\0' || strcmp(listen_addr, "*") == 0 ||
2233 (!is_client && gateway_ports == 1))
2234 wildcard = 1;
2235 else if (strcmp(listen_addr, "localhost") != 0)
2236 addr = listen_addr;
2237 }
2238
2239 debug3("channel_setup_fwd_listener: type %d wildcard %d addr %s",
2240 type, wildcard, (addr == NULL) ? "NULL" : addr);
2241
2242 /*
Damien Miller34132e52000-01-14 15:45:46 +11002243 * getaddrinfo returns a loopback address if the hostname is
2244 * set to NULL and hints.ai_flags is not AI_PASSIVE
Damien Miller5428f641999-11-25 11:54:57 +11002245 */
Damien Miller34132e52000-01-14 15:45:46 +11002246 memset(&hints, 0, sizeof(hints));
2247 hints.ai_family = IPv4or6;
Damien Millerf91ee4c2005-03-01 21:24:33 +11002248 hints.ai_flags = wildcard ? AI_PASSIVE : 0;
Damien Miller34132e52000-01-14 15:45:46 +11002249 hints.ai_socktype = SOCK_STREAM;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002250 snprintf(strport, sizeof strport, "%d", listen_port);
Damien Millerf91ee4c2005-03-01 21:24:33 +11002251 if ((r = getaddrinfo(addr, strport, &hints, &aitop)) != 0) {
2252 if (addr == NULL) {
2253 /* This really shouldn't happen */
2254 packet_disconnect("getaddrinfo: fatal error: %s",
2255 gai_strerror(r));
2256 } else {
Damien Millera7270302005-07-06 09:36:05 +10002257 error("channel_setup_fwd_listener: "
Damien Millerf91ee4c2005-03-01 21:24:33 +11002258 "getaddrinfo(%.64s): %s", addr, gai_strerror(r));
2259 }
Damien Millera7270302005-07-06 09:36:05 +10002260 return 0;
Damien Millerf91ee4c2005-03-01 21:24:33 +11002261 }
Damien Miller5428f641999-11-25 11:54:57 +11002262
Damien Miller34132e52000-01-14 15:45:46 +11002263 for (ai = aitop; ai; ai = ai->ai_next) {
2264 if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
2265 continue;
2266 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop),
2267 strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
Damien Millerb16461c2002-01-22 23:29:22 +11002268 error("channel_setup_fwd_listener: getnameinfo failed");
Damien Miller34132e52000-01-14 15:45:46 +11002269 continue;
2270 }
2271 /* Create a port to listen for the host. */
Damien Miller2372ace2003-05-14 13:42:23 +10002272 sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
Damien Miller34132e52000-01-14 15:45:46 +11002273 if (sock < 0) {
2274 /* this is no error since kernel may not support ipv6 */
2275 verbose("socket: %.100s", strerror(errno));
2276 continue;
2277 }
2278 /*
Damien Millere1383ce2002-09-19 11:49:37 +10002279 * Set socket options.
2280 * Allow local port reuse in TIME_WAIT.
Damien Miller34132e52000-01-14 15:45:46 +11002281 */
Damien Millere1383ce2002-09-19 11:49:37 +10002282 if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &on,
2283 sizeof(on)) == -1)
2284 error("setsockopt SO_REUSEADDR: %s", strerror(errno));
2285
Damien Miller34132e52000-01-14 15:45:46 +11002286 debug("Local forwarding listening on %s port %s.", ntop, strport);
Damien Miller95def091999-11-25 00:26:21 +11002287
Damien Miller34132e52000-01-14 15:45:46 +11002288 /* Bind the socket to the address. */
2289 if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
2290 /* address can be in use ipv6 address is already bound */
Damien Miller3c7eeb22000-03-03 22:35:33 +11002291 if (!ai->ai_next)
2292 error("bind: %.100s", strerror(errno));
2293 else
2294 verbose("bind: %.100s", strerror(errno));
Kevin Stevesef4eea92001-02-05 12:42:17 +00002295
Damien Miller34132e52000-01-14 15:45:46 +11002296 close(sock);
2297 continue;
2298 }
2299 /* Start listening for connections on the socket. */
Darren Tucker3175eb92003-12-09 19:15:11 +11002300 if (listen(sock, SSH_LISTEN_BACKLOG) < 0) {
Damien Miller34132e52000-01-14 15:45:46 +11002301 error("listen: %.100s", strerror(errno));
2302 close(sock);
2303 continue;
2304 }
2305 /* Allocate a channel number for the socket. */
Ben Lindstrome9c99912001-06-09 00:41:05 +00002306 c = channel_new("port listener", type, sock, sock, -1,
Damien Millerbd483e72000-04-30 10:00:53 +10002307 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10002308 0, "port listener", 1);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002309 strlcpy(c->path, host, sizeof(c->path));
2310 c->host_port = port_to_connect;
2311 c->listening_port = listen_port;
Damien Miller34132e52000-01-14 15:45:46 +11002312 success = 1;
2313 }
2314 if (success == 0)
Damien Millerb16461c2002-01-22 23:29:22 +11002315 error("channel_setup_fwd_listener: cannot listen to port: %d",
Kevin Steves12057502001-02-05 14:54:34 +00002316 listen_port);
Damien Miller34132e52000-01-14 15:45:46 +11002317 freeaddrinfo(aitop);
Kevin Steves12057502001-02-05 14:54:34 +00002318 return success;
Damien Miller95def091999-11-25 00:26:21 +11002319}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002320
Darren Tuckere7066df2004-05-24 10:18:05 +10002321int
2322channel_cancel_rport_listener(const char *host, u_short port)
2323{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10002324 u_int i;
2325 int found = 0;
Darren Tuckere7066df2004-05-24 10:18:05 +10002326
Darren Tucker47eede72005-03-14 23:08:12 +11002327 for (i = 0; i < channels_alloc; i++) {
Darren Tuckere7066df2004-05-24 10:18:05 +10002328 Channel *c = channels[i];
2329
2330 if (c != NULL && c->type == SSH_CHANNEL_RPORT_LISTENER &&
2331 strncmp(c->path, host, sizeof(c->path)) == 0 &&
Darren Tuckerfc959702004-07-17 16:12:08 +10002332 c->listening_port == port) {
Darren Tuckere6ed8392004-08-29 16:29:44 +10002333 debug2("%s: close channel %d", __func__, i);
Darren Tuckere7066df2004-05-24 10:18:05 +10002334 channel_free(c);
2335 found = 1;
2336 }
2337 }
2338
2339 return (found);
2340}
2341
Damien Millerb16461c2002-01-22 23:29:22 +11002342/* protocol local port fwd, used by ssh (and sshd in v1) */
2343int
Damien Millerf91ee4c2005-03-01 21:24:33 +11002344channel_setup_local_fwd_listener(const char *listen_host, u_short listen_port,
Damien Millerb16461c2002-01-22 23:29:22 +11002345 const char *host_to_connect, u_short port_to_connect, int gateway_ports)
2346{
2347 return channel_setup_fwd_listener(SSH_CHANNEL_PORT_LISTENER,
Damien Millerf91ee4c2005-03-01 21:24:33 +11002348 listen_host, listen_port, host_to_connect, port_to_connect,
2349 gateway_ports);
Damien Millerb16461c2002-01-22 23:29:22 +11002350}
2351
2352/* protocol v2 remote port fwd, used by sshd */
2353int
2354channel_setup_remote_fwd_listener(const char *listen_address,
2355 u_short listen_port, int gateway_ports)
2356{
2357 return channel_setup_fwd_listener(SSH_CHANNEL_RPORT_LISTENER,
2358 listen_address, listen_port, NULL, 0, gateway_ports);
2359}
2360
Damien Miller5428f641999-11-25 11:54:57 +11002361/*
2362 * Initiate forwarding of connections to port "port" on remote host through
2363 * the secure channel to host:port from local side.
2364 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002365
Damien Miller4af51302000-04-16 11:18:38 +10002366void
Damien Millerf91ee4c2005-03-01 21:24:33 +11002367channel_request_remote_forwarding(const char *listen_host, u_short listen_port,
Damien Miller0bc1bd82000-11-13 22:57:25 +11002368 const char *host_to_connect, u_short port_to_connect)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002369{
Damien Millerdff50992002-01-22 23:16:32 +11002370 int type, success = 0;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002371
Damien Miller95def091999-11-25 00:26:21 +11002372 /* Record locally that connection to this host/port is permitted. */
2373 if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION)
2374 fatal("channel_request_remote_forwarding: too many forwards");
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002375
Damien Miller95def091999-11-25 00:26:21 +11002376 /* Send the forward request to the remote side. */
Damien Miller33b13562000-04-04 14:38:59 +10002377 if (compat20) {
Damien Millerf91ee4c2005-03-01 21:24:33 +11002378 const char *address_to_bind;
2379 if (listen_host == NULL)
2380 address_to_bind = "localhost";
2381 else if (*listen_host == '\0' || strcmp(listen_host, "*") == 0)
2382 address_to_bind = "";
2383 else
2384 address_to_bind = listen_host;
2385
Damien Miller33b13562000-04-04 14:38:59 +10002386 packet_start(SSH2_MSG_GLOBAL_REQUEST);
2387 packet_put_cstring("tcpip-forward");
Damien Miller2797f7f2002-04-23 21:09:44 +10002388 packet_put_char(1); /* boolean: want reply */
Damien Miller33b13562000-04-04 14:38:59 +10002389 packet_put_cstring(address_to_bind);
2390 packet_put_int(listen_port);
Damien Miller0bc1bd82000-11-13 22:57:25 +11002391 packet_send();
2392 packet_write_wait();
2393 /* Assume that server accepts the request */
2394 success = 1;
Damien Miller33b13562000-04-04 14:38:59 +10002395 } else {
2396 packet_start(SSH_CMSG_PORT_FORWARD_REQUEST);
Damien Miller33b13562000-04-04 14:38:59 +10002397 packet_put_int(listen_port);
Damien Miller8bb73be2000-04-19 16:26:12 +10002398 packet_put_cstring(host_to_connect);
2399 packet_put_int(port_to_connect);
Damien Miller33b13562000-04-04 14:38:59 +10002400 packet_send();
2401 packet_write_wait();
Damien Miller0bc1bd82000-11-13 22:57:25 +11002402
2403 /* Wait for response from the remote side. */
Damien Millerdff50992002-01-22 23:16:32 +11002404 type = packet_read();
Damien Miller0bc1bd82000-11-13 22:57:25 +11002405 switch (type) {
2406 case SSH_SMSG_SUCCESS:
2407 success = 1;
2408 break;
2409 case SSH_SMSG_FAILURE:
Damien Miller996acd22003-04-09 20:59:48 +10002410 logit("Warning: Server denied remote port forwarding.");
Damien Miller0bc1bd82000-11-13 22:57:25 +11002411 break;
2412 default:
2413 /* Unknown packet */
2414 packet_disconnect("Protocol error for port forward request:"
2415 "received packet type %d.", type);
2416 }
2417 }
2418 if (success) {
2419 permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host_to_connect);
2420 permitted_opens[num_permitted_opens].port_to_connect = port_to_connect;
2421 permitted_opens[num_permitted_opens].listen_port = listen_port;
2422 num_permitted_opens++;
Damien Miller33b13562000-04-04 14:38:59 +10002423 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002424}
2425
Damien Miller5428f641999-11-25 11:54:57 +11002426/*
Darren Tuckerfc959702004-07-17 16:12:08 +10002427 * Request cancellation of remote forwarding of connection host:port from
Darren Tuckere7066df2004-05-24 10:18:05 +10002428 * local side.
2429 */
Darren Tuckere7066df2004-05-24 10:18:05 +10002430void
Damien Millerf91ee4c2005-03-01 21:24:33 +11002431channel_request_rforward_cancel(const char *host, u_short port)
Darren Tuckere7066df2004-05-24 10:18:05 +10002432{
2433 int i;
Darren Tuckere7066df2004-05-24 10:18:05 +10002434
2435 if (!compat20)
2436 return;
2437
2438 for (i = 0; i < num_permitted_opens; i++) {
Darren Tuckerfc959702004-07-17 16:12:08 +10002439 if (permitted_opens[i].host_to_connect != NULL &&
Darren Tuckere7066df2004-05-24 10:18:05 +10002440 permitted_opens[i].listen_port == port)
2441 break;
2442 }
2443 if (i >= num_permitted_opens) {
2444 debug("%s: requested forward not found", __func__);
2445 return;
2446 }
2447 packet_start(SSH2_MSG_GLOBAL_REQUEST);
2448 packet_put_cstring("cancel-tcpip-forward");
2449 packet_put_char(0);
Damien Millerf91ee4c2005-03-01 21:24:33 +11002450 packet_put_cstring(host == NULL ? "" : host);
Darren Tuckere7066df2004-05-24 10:18:05 +10002451 packet_put_int(port);
2452 packet_send();
2453
2454 permitted_opens[i].listen_port = 0;
2455 permitted_opens[i].port_to_connect = 0;
2456 free(permitted_opens[i].host_to_connect);
2457 permitted_opens[i].host_to_connect = NULL;
2458}
2459
2460/*
Damien Miller5428f641999-11-25 11:54:57 +11002461 * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates
2462 * listening for the port, and sends back a success reply (or disconnect
2463 * message if there was an error). This never returns if there was an error.
2464 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002465
Damien Miller4af51302000-04-16 11:18:38 +10002466void
Damien Millere247cc42000-05-07 12:03:14 +10002467channel_input_port_forward_request(int is_root, int gateway_ports)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002468{
Damien Milleraae6c611999-12-06 11:47:28 +11002469 u_short port, host_port;
Damien Miller95def091999-11-25 00:26:21 +11002470 char *hostname;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002471
Damien Miller95def091999-11-25 00:26:21 +11002472 /* Get arguments from the packet. */
2473 port = packet_get_int();
2474 hostname = packet_get_string(NULL);
2475 host_port = packet_get_int();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002476
Damien Millerbac2d8a2000-09-05 16:13:06 +11002477#ifndef HAVE_CYGWIN
Damien Miller5428f641999-11-25 11:54:57 +11002478 /*
2479 * Check that an unprivileged user is not trying to forward a
2480 * privileged port.
2481 */
Damien Miller95def091999-11-25 00:26:21 +11002482 if (port < IPPORT_RESERVED && !is_root)
Darren Tucker9189ff82003-07-03 13:52:04 +10002483 packet_disconnect(
2484 "Requested forwarding of port %d but user is not root.",
2485 port);
2486 if (host_port == 0)
2487 packet_disconnect("Dynamic forwarding denied.");
Damien Millerbac2d8a2000-09-05 16:13:06 +11002488#endif
Darren Tucker9189ff82003-07-03 13:52:04 +10002489
Damien Miller0bc1bd82000-11-13 22:57:25 +11002490 /* Initiate forwarding */
Damien Millerf91ee4c2005-03-01 21:24:33 +11002491 channel_setup_local_fwd_listener(NULL, port, hostname,
2492 host_port, gateway_ports);
Damien Miller95def091999-11-25 00:26:21 +11002493
2494 /* Free the argument string. */
2495 xfree(hostname);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002496}
2497
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002498/*
2499 * Permits opening to any host/port if permitted_opens[] is empty. This is
2500 * usually called by the server, because the user could connect to any port
2501 * anyway, and the server has no way to know but to trust the client anyway.
2502 */
2503void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00002504channel_permit_all_opens(void)
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002505{
2506 if (num_permitted_opens == 0)
2507 all_opens_permitted = 1;
2508}
2509
Ben Lindstroma3700052001-04-05 23:26:32 +00002510void
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002511channel_add_permitted_opens(char *host, int port)
2512{
2513 if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION)
2514 fatal("channel_request_remote_forwarding: too many forwards");
2515 debug("allow port forwarding to host %s port %d", host, port);
2516
2517 permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host);
2518 permitted_opens[num_permitted_opens].port_to_connect = port;
2519 num_permitted_opens++;
2520
2521 all_opens_permitted = 0;
2522}
2523
Ben Lindstroma3700052001-04-05 23:26:32 +00002524void
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002525channel_clear_permitted_opens(void)
2526{
2527 int i;
2528
2529 for (i = 0; i < num_permitted_opens; i++)
Darren Tuckere7066df2004-05-24 10:18:05 +10002530 if (permitted_opens[i].host_to_connect != NULL)
2531 xfree(permitted_opens[i].host_to_connect);
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002532 num_permitted_opens = 0;
2533
2534}
2535
2536
2537/* return socket to remote host, port */
Ben Lindstrombba81212001-06-25 05:01:22 +00002538static int
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002539connect_to(const char *host, u_short port)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002540{
Damien Miller34132e52000-01-14 15:45:46 +11002541 struct addrinfo hints, *ai, *aitop;
2542 char ntop[NI_MAXHOST], strport[NI_MAXSERV];
2543 int gaierr;
Damien Millerb38eff82000-04-01 11:09:21 +10002544 int sock = -1;
Damien Miller95def091999-11-25 00:26:21 +11002545
Damien Miller34132e52000-01-14 15:45:46 +11002546 memset(&hints, 0, sizeof(hints));
2547 hints.ai_family = IPv4or6;
2548 hints.ai_socktype = SOCK_STREAM;
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002549 snprintf(strport, sizeof strport, "%d", port);
Damien Miller34132e52000-01-14 15:45:46 +11002550 if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) {
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002551 error("connect_to %.100s: unknown host (%s)", host,
2552 gai_strerror(gaierr));
Damien Millerb38eff82000-04-01 11:09:21 +10002553 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002554 }
Damien Miller34132e52000-01-14 15:45:46 +11002555 for (ai = aitop; ai; ai = ai->ai_next) {
2556 if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
2557 continue;
2558 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop),
2559 strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002560 error("connect_to: getnameinfo failed");
Damien Miller34132e52000-01-14 15:45:46 +11002561 continue;
2562 }
Damien Miller2372ace2003-05-14 13:42:23 +10002563 sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
Damien Miller34132e52000-01-14 15:45:46 +11002564 if (sock < 0) {
Damien Millerb46b9f32003-01-10 21:45:12 +11002565 if (ai->ai_next == NULL)
2566 error("socket: %.100s", strerror(errno));
2567 else
2568 verbose("socket: %.100s", strerror(errno));
Damien Miller34132e52000-01-14 15:45:46 +11002569 continue;
2570 }
Damien Miller232711f2004-06-15 10:35:30 +10002571 if (set_nonblock(sock) == -1)
2572 fatal("%s: set_nonblock(%d)", __func__, sock);
Ben Lindstrom7ad97102000-12-06 01:42:49 +00002573 if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0 &&
2574 errno != EINPROGRESS) {
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002575 error("connect_to %.100s port %s: %.100s", ntop, strport,
Damien Miller34132e52000-01-14 15:45:46 +11002576 strerror(errno));
2577 close(sock);
Kevin Stevesef4eea92001-02-05 12:42:17 +00002578 continue; /* fail -- try next */
Damien Miller34132e52000-01-14 15:45:46 +11002579 }
2580 break; /* success */
2581
2582 }
2583 freeaddrinfo(aitop);
Damien Miller34132e52000-01-14 15:45:46 +11002584 if (!ai) {
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002585 error("connect_to %.100s port %d: failed.", host, port);
Damien Millerb38eff82000-04-01 11:09:21 +10002586 return -1;
2587 }
2588 /* success */
Ben Lindstrom1ebd7a52002-02-26 18:12:51 +00002589 set_nodelay(sock);
Damien Millerb38eff82000-04-01 11:09:21 +10002590 return sock;
2591}
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002592
Damien Miller0bc1bd82000-11-13 22:57:25 +11002593int
Ben Lindstrom173e6462001-07-04 05:15:15 +00002594channel_connect_by_listen_address(u_short listen_port)
Damien Miller0bc1bd82000-11-13 22:57:25 +11002595{
2596 int i;
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002597
Damien Miller0bc1bd82000-11-13 22:57:25 +11002598 for (i = 0; i < num_permitted_opens; i++)
Darren Tuckere7066df2004-05-24 10:18:05 +10002599 if (permitted_opens[i].host_to_connect != NULL &&
2600 permitted_opens[i].listen_port == listen_port)
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002601 return connect_to(
Damien Miller0bc1bd82000-11-13 22:57:25 +11002602 permitted_opens[i].host_to_connect,
2603 permitted_opens[i].port_to_connect);
Ben Lindstromc72745a2000-12-02 19:03:54 +00002604 error("WARNING: Server requests forwarding for unknown listen_port %d",
2605 listen_port);
Damien Miller0bc1bd82000-11-13 22:57:25 +11002606 return -1;
2607}
Damien Millerb38eff82000-04-01 11:09:21 +10002608
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002609/* Check if connecting to that port is permitted and connect. */
2610int
2611channel_connect_to(const char *host, u_short port)
2612{
2613 int i, permit;
2614
2615 permit = all_opens_permitted;
2616 if (!permit) {
2617 for (i = 0; i < num_permitted_opens; i++)
Darren Tuckere7066df2004-05-24 10:18:05 +10002618 if (permitted_opens[i].host_to_connect != NULL &&
2619 permitted_opens[i].port_to_connect == port &&
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002620 strcmp(permitted_opens[i].host_to_connect, host) == 0)
2621 permit = 1;
2622
2623 }
2624 if (!permit) {
Damien Miller996acd22003-04-09 20:59:48 +10002625 logit("Received request to connect to host %.100s port %d, "
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002626 "but the request was denied.", host, port);
2627 return -1;
2628 }
2629 return connect_to(host, port);
2630}
2631
Damien Miller0e220db2004-06-15 10:34:08 +10002632void
2633channel_send_window_changes(void)
2634{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10002635 u_int i;
Damien Miller0e220db2004-06-15 10:34:08 +10002636 struct winsize ws;
2637
2638 for (i = 0; i < channels_alloc; i++) {
Darren Tucker47eede72005-03-14 23:08:12 +11002639 if (channels[i] == NULL || !channels[i]->client_tty ||
Damien Miller0e220db2004-06-15 10:34:08 +10002640 channels[i]->type != SSH_CHANNEL_OPEN)
2641 continue;
2642 if (ioctl(channels[i]->rfd, TIOCGWINSZ, &ws) < 0)
2643 continue;
2644 channel_request_start(i, "window-change", 0);
2645 packet_put_int(ws.ws_col);
2646 packet_put_int(ws.ws_row);
2647 packet_put_int(ws.ws_xpixel);
2648 packet_put_int(ws.ws_ypixel);
2649 packet_send();
2650 }
2651}
2652
Ben Lindstrome9c99912001-06-09 00:41:05 +00002653/* -- X11 forwarding */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002654
Damien Miller5428f641999-11-25 11:54:57 +11002655/*
2656 * Creates an internet domain socket for listening for X11 connections.
Ben Lindstroma9d2c892002-06-23 21:48:28 +00002657 * Returns 0 and a suitable display number for the DISPLAY variable
2658 * stored in display_numberp , or -1 if an error occurs.
Damien Miller5428f641999-11-25 11:54:57 +11002659 */
Kevin Steves366298c2001-12-19 17:58:01 +00002660int
Damien Miller95c249f2002-02-05 12:11:34 +11002661x11_create_display_inet(int x11_display_offset, int x11_use_localhost,
Damien Miller2b9b0452005-07-17 17:19:24 +10002662 int single_connection, u_int *display_numberp, int **chanids)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002663{
Damien Millere7378562001-12-21 14:58:35 +11002664 Channel *nc = NULL;
Damien Milleraae6c611999-12-06 11:47:28 +11002665 int display_number, sock;
2666 u_short port;
Damien Miller34132e52000-01-14 15:45:46 +11002667 struct addrinfo hints, *ai, *aitop;
2668 char strport[NI_MAXSERV];
2669 int gaierr, n, num_socks = 0, socks[NUM_SOCKS];
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002670
Damien Millera34a28b1999-12-14 10:47:15 +11002671 for (display_number = x11_display_offset;
Damien Miller9f0f5c62001-12-21 14:45:46 +11002672 display_number < MAX_DISPLAYS;
2673 display_number++) {
Damien Miller95def091999-11-25 00:26:21 +11002674 port = 6000 + display_number;
Damien Miller34132e52000-01-14 15:45:46 +11002675 memset(&hints, 0, sizeof(hints));
2676 hints.ai_family = IPv4or6;
Damien Miller95c249f2002-02-05 12:11:34 +11002677 hints.ai_flags = x11_use_localhost ? 0: AI_PASSIVE;
Damien Miller34132e52000-01-14 15:45:46 +11002678 hints.ai_socktype = SOCK_STREAM;
2679 snprintf(strport, sizeof strport, "%d", port);
2680 if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) {
2681 error("getaddrinfo: %.100s", gai_strerror(gaierr));
Kevin Steves366298c2001-12-19 17:58:01 +00002682 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002683 }
Damien Miller34132e52000-01-14 15:45:46 +11002684 for (ai = aitop; ai; ai = ai->ai_next) {
2685 if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
2686 continue;
Damien Miller2372ace2003-05-14 13:42:23 +10002687 sock = socket(ai->ai_family, ai->ai_socktype,
2688 ai->ai_protocol);
Damien Miller34132e52000-01-14 15:45:46 +11002689 if (sock < 0) {
Damien Miller89d97962000-10-14 12:37:19 +11002690 if ((errno != EINVAL) && (errno != EAFNOSUPPORT)) {
Damien Millere2192732000-01-17 13:22:55 +11002691 error("socket: %.100s", strerror(errno));
Damien Miller3e4dffb2004-06-15 10:27:15 +10002692 freeaddrinfo(aitop);
Kevin Steves366298c2001-12-19 17:58:01 +00002693 return -1;
Damien Millere2192732000-01-17 13:22:55 +11002694 } else {
Damien Millercb5e44a2000-09-29 12:12:36 +11002695 debug("x11_create_display_inet: Socket family %d not supported",
2696 ai->ai_family);
Damien Millere2192732000-01-17 13:22:55 +11002697 continue;
2698 }
Damien Miller34132e52000-01-14 15:45:46 +11002699 }
Kevin Stevesdf75dd22002-06-04 20:52:19 +00002700#ifdef IPV6_V6ONLY
2701 if (ai->ai_family == AF_INET6) {
2702 int on = 1;
2703 if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) < 0)
2704 error("setsockopt IPV6_V6ONLY: %.100s", strerror(errno));
2705 }
2706#endif
Damien Miller34132e52000-01-14 15:45:46 +11002707 if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +10002708 debug2("bind port %d: %.100s", port, strerror(errno));
Damien Miller34132e52000-01-14 15:45:46 +11002709 close(sock);
Damien Miller3c7eeb22000-03-03 22:35:33 +11002710
2711 if (ai->ai_next)
2712 continue;
2713
Damien Miller34132e52000-01-14 15:45:46 +11002714 for (n = 0; n < num_socks; n++) {
Damien Miller34132e52000-01-14 15:45:46 +11002715 close(socks[n]);
2716 }
2717 num_socks = 0;
2718 break;
2719 }
2720 socks[num_socks++] = sock;
Damien Miller7bcb0892000-03-11 20:45:40 +11002721#ifndef DONT_TRY_OTHER_AF
Damien Miller34132e52000-01-14 15:45:46 +11002722 if (num_socks == NUM_SOCKS)
2723 break;
Damien Miller7bcb0892000-03-11 20:45:40 +11002724#else
Kevin Stevesdf75dd22002-06-04 20:52:19 +00002725 if (x11_use_localhost) {
2726 if (num_socks == NUM_SOCKS)
2727 break;
2728 } else {
2729 break;
2730 }
Damien Miller7bcb0892000-03-11 20:45:40 +11002731#endif
Damien Miller95def091999-11-25 00:26:21 +11002732 }
Ben Lindstrom87b147f2001-01-25 00:41:12 +00002733 freeaddrinfo(aitop);
Damien Miller34132e52000-01-14 15:45:46 +11002734 if (num_socks > 0)
2735 break;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002736 }
Damien Miller95def091999-11-25 00:26:21 +11002737 if (display_number >= MAX_DISPLAYS) {
2738 error("Failed to allocate internet-domain X11 display socket.");
Kevin Steves366298c2001-12-19 17:58:01 +00002739 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002740 }
Damien Miller95def091999-11-25 00:26:21 +11002741 /* Start listening for connections on the socket. */
Damien Miller34132e52000-01-14 15:45:46 +11002742 for (n = 0; n < num_socks; n++) {
2743 sock = socks[n];
Darren Tucker3175eb92003-12-09 19:15:11 +11002744 if (listen(sock, SSH_LISTEN_BACKLOG) < 0) {
Damien Miller34132e52000-01-14 15:45:46 +11002745 error("listen: %.100s", strerror(errno));
Damien Miller34132e52000-01-14 15:45:46 +11002746 close(sock);
Kevin Steves366298c2001-12-19 17:58:01 +00002747 return -1;
Damien Miller34132e52000-01-14 15:45:46 +11002748 }
Damien Miller95def091999-11-25 00:26:21 +11002749 }
Damien Miller34132e52000-01-14 15:45:46 +11002750
Damien Miller34132e52000-01-14 15:45:46 +11002751 /* Allocate a channel for each socket. */
Damien Miller2b9b0452005-07-17 17:19:24 +10002752 if (chanids != NULL)
2753 *chanids = xmalloc(sizeof(**chanids) * (num_socks + 1));
Damien Miller34132e52000-01-14 15:45:46 +11002754 for (n = 0; n < num_socks; n++) {
2755 sock = socks[n];
Damien Millere7378562001-12-21 14:58:35 +11002756 nc = channel_new("x11 listener",
Damien Millerbd483e72000-04-30 10:00:53 +10002757 SSH_CHANNEL_X11_LISTENER, sock, sock, -1,
2758 CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10002759 0, "X11 inet listener", 1);
Damien Miller699d0032002-02-08 22:07:16 +11002760 nc->single_connection = single_connection;
Damien Miller2b9b0452005-07-17 17:19:24 +10002761 if (*chanids != NULL)
2762 (*chanids)[n] = nc->self;
Damien Miller34132e52000-01-14 15:45:46 +11002763 }
Damien Miller2b9b0452005-07-17 17:19:24 +10002764 if (*chanids != NULL)
2765 (*chanids)[n] = -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002766
Kevin Steves366298c2001-12-19 17:58:01 +00002767 /* Return the display number for the DISPLAY environment variable. */
Ben Lindstroma9d2c892002-06-23 21:48:28 +00002768 *display_numberp = display_number;
2769 return (0);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002770}
2771
Ben Lindstrombba81212001-06-25 05:01:22 +00002772static int
Ben Lindstrom46c16222000-12-22 01:43:59 +00002773connect_local_xsocket(u_int dnr)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002774{
Damien Miller95def091999-11-25 00:26:21 +11002775 int sock;
2776 struct sockaddr_un addr;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002777
Damien Miller3afe3752001-12-21 12:39:51 +11002778 sock = socket(AF_UNIX, SOCK_STREAM, 0);
2779 if (sock < 0)
2780 error("socket: %.100s", strerror(errno));
2781 memset(&addr, 0, sizeof(addr));
2782 addr.sun_family = AF_UNIX;
2783 snprintf(addr.sun_path, sizeof addr.sun_path, _PATH_UNIX_X, dnr);
2784 if (connect(sock, (struct sockaddr *) & addr, sizeof(addr)) == 0)
2785 return sock;
2786 close(sock);
Damien Miller95def091999-11-25 00:26:21 +11002787 error("connect %.100s: %.100s", addr.sun_path, strerror(errno));
2788 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002789}
2790
Damien Millerbd483e72000-04-30 10:00:53 +10002791int
2792x11_connect_display(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002793{
Damien Miller398e1cf2002-02-05 11:52:13 +11002794 int display_number, sock = 0;
Damien Miller95def091999-11-25 00:26:21 +11002795 const char *display;
Damien Millerbd483e72000-04-30 10:00:53 +10002796 char buf[1024], *cp;
Damien Miller34132e52000-01-14 15:45:46 +11002797 struct addrinfo hints, *ai, *aitop;
2798 char strport[NI_MAXSERV];
2799 int gaierr;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002800
Damien Miller95def091999-11-25 00:26:21 +11002801 /* Try to open a socket for the local X server. */
2802 display = getenv("DISPLAY");
2803 if (!display) {
2804 error("DISPLAY not set.");
Damien Millerbd483e72000-04-30 10:00:53 +10002805 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002806 }
Damien Miller5428f641999-11-25 11:54:57 +11002807 /*
2808 * Now we decode the value of the DISPLAY variable and make a
2809 * connection to the real X server.
2810 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002811
Damien Miller5428f641999-11-25 11:54:57 +11002812 /*
2813 * Check if it is a unix domain socket. Unix domain displays are in
2814 * one of the following formats: unix:d[.s], :d[.s], ::d[.s]
2815 */
Damien Miller95def091999-11-25 00:26:21 +11002816 if (strncmp(display, "unix:", 5) == 0 ||
2817 display[0] == ':') {
2818 /* Connect to the unix domain socket. */
2819 if (sscanf(strrchr(display, ':') + 1, "%d", &display_number) != 1) {
2820 error("Could not parse display number from DISPLAY: %.100s",
Damien Miller9f0f5c62001-12-21 14:45:46 +11002821 display);
Damien Millerbd483e72000-04-30 10:00:53 +10002822 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002823 }
2824 /* Create a socket. */
2825 sock = connect_local_xsocket(display_number);
2826 if (sock < 0)
Damien Millerbd483e72000-04-30 10:00:53 +10002827 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002828
2829 /* OK, we now have a connection to the display. */
Damien Millerbd483e72000-04-30 10:00:53 +10002830 return sock;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002831 }
Damien Miller5428f641999-11-25 11:54:57 +11002832 /*
2833 * Connect to an inet socket. The DISPLAY value is supposedly
2834 * hostname:d[.s], where hostname may also be numeric IP address.
2835 */
Ben Lindstromccd8d072001-12-07 17:26:48 +00002836 strlcpy(buf, display, sizeof(buf));
Damien Miller95def091999-11-25 00:26:21 +11002837 cp = strchr(buf, ':');
2838 if (!cp) {
2839 error("Could not find ':' in DISPLAY: %.100s", display);
Damien Millerbd483e72000-04-30 10:00:53 +10002840 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002841 }
Damien Miller95def091999-11-25 00:26:21 +11002842 *cp = 0;
Damien Miller5428f641999-11-25 11:54:57 +11002843 /* buf now contains the host name. But first we parse the display number. */
Damien Miller95def091999-11-25 00:26:21 +11002844 if (sscanf(cp + 1, "%d", &display_number) != 1) {
2845 error("Could not parse display number from DISPLAY: %.100s",
Damien Miller9f0f5c62001-12-21 14:45:46 +11002846 display);
Damien Millerbd483e72000-04-30 10:00:53 +10002847 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002848 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002849
Damien Miller34132e52000-01-14 15:45:46 +11002850 /* Look up the host address */
2851 memset(&hints, 0, sizeof(hints));
2852 hints.ai_family = IPv4or6;
2853 hints.ai_socktype = SOCK_STREAM;
2854 snprintf(strport, sizeof strport, "%d", 6000 + display_number);
2855 if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) {
2856 error("%.100s: unknown host. (%s)", buf, gai_strerror(gaierr));
Damien Millerbd483e72000-04-30 10:00:53 +10002857 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002858 }
Damien Miller34132e52000-01-14 15:45:46 +11002859 for (ai = aitop; ai; ai = ai->ai_next) {
2860 /* Create a socket. */
Damien Miller2372ace2003-05-14 13:42:23 +10002861 sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
Damien Miller34132e52000-01-14 15:45:46 +11002862 if (sock < 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +10002863 debug2("socket: %.100s", strerror(errno));
Damien Millerb38eff82000-04-01 11:09:21 +10002864 continue;
2865 }
2866 /* Connect it to the display. */
2867 if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +10002868 debug2("connect %.100s port %d: %.100s", buf,
Damien Millerb38eff82000-04-01 11:09:21 +10002869 6000 + display_number, strerror(errno));
2870 close(sock);
2871 continue;
2872 }
2873 /* Success */
2874 break;
Damien Miller34132e52000-01-14 15:45:46 +11002875 }
Damien Miller34132e52000-01-14 15:45:46 +11002876 freeaddrinfo(aitop);
2877 if (!ai) {
Damien Miller4af51302000-04-16 11:18:38 +10002878 error("connect %.100s port %d: %.100s", buf, 6000 + display_number,
Damien Miller34132e52000-01-14 15:45:46 +11002879 strerror(errno));
Damien Millerbd483e72000-04-30 10:00:53 +10002880 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002881 }
Damien Miller398e1cf2002-02-05 11:52:13 +11002882 set_nodelay(sock);
Damien Millerbd483e72000-04-30 10:00:53 +10002883 return sock;
2884}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002885
Damien Millerbd483e72000-04-30 10:00:53 +10002886/*
2887 * This is called when SSH_SMSG_X11_OPEN is received. The packet contains
2888 * the remote channel number. We should do whatever we want, and respond
2889 * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE.
2890 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002891
Damien Millerbd483e72000-04-30 10:00:53 +10002892void
Damien Miller630d6f42002-01-22 23:17:30 +11002893x11_input_open(int type, u_int32_t seq, void *ctxt)
Damien Millerbd483e72000-04-30 10:00:53 +10002894{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002895 Channel *c = NULL;
2896 int remote_id, sock = 0;
Damien Millerbd483e72000-04-30 10:00:53 +10002897 char *remote_host;
Damien Millerbd483e72000-04-30 10:00:53 +10002898
2899 debug("Received X11 open request.");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002900
2901 remote_id = packet_get_int();
Ben Lindstrome9c99912001-06-09 00:41:05 +00002902
2903 if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002904 remote_host = packet_get_string(NULL);
2905 } else {
2906 remote_host = xstrdup("unknown (remote did not supply name)");
2907 }
Damien Miller48b03fc2002-01-22 23:11:40 +11002908 packet_check_eom();
Damien Millerbd483e72000-04-30 10:00:53 +10002909
2910 /* Obtain a connection to the real X display. */
2911 sock = x11_connect_display();
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002912 if (sock != -1) {
2913 /* Allocate a channel for this connection. */
2914 c = channel_new("connected x11 socket",
2915 SSH_CHANNEL_X11_OPEN, sock, sock, -1, 0, 0, 0,
2916 remote_host, 1);
Damien Miller699d0032002-02-08 22:07:16 +11002917 c->remote_id = remote_id;
2918 c->force_drain = 1;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002919 }
Damien Millerb1ca8bb2003-05-14 13:45:42 +10002920 xfree(remote_host);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002921 if (c == NULL) {
Damien Millerbd483e72000-04-30 10:00:53 +10002922 /* Send refusal to the remote host. */
2923 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002924 packet_put_int(remote_id);
Damien Millerbd483e72000-04-30 10:00:53 +10002925 } else {
Damien Millerbd483e72000-04-30 10:00:53 +10002926 /* Send a confirmation to the remote host. */
2927 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002928 packet_put_int(remote_id);
2929 packet_put_int(c->self);
Damien Millerbd483e72000-04-30 10:00:53 +10002930 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002931 packet_send();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002932}
2933
Damien Miller69b69aa2000-10-28 14:19:58 +11002934/* dummy protocol handler that denies SSH-1 requests (agent/x11) */
2935void
Damien Miller630d6f42002-01-22 23:17:30 +11002936deny_input_open(int type, u_int32_t seq, void *ctxt)
Damien Miller69b69aa2000-10-28 14:19:58 +11002937{
2938 int rchan = packet_get_int();
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +00002939
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00002940 switch (type) {
Damien Miller69b69aa2000-10-28 14:19:58 +11002941 case SSH_SMSG_AGENT_OPEN:
2942 error("Warning: ssh server tried agent forwarding.");
2943 break;
2944 case SSH_SMSG_X11_OPEN:
2945 error("Warning: ssh server tried X11 forwarding.");
2946 break;
2947 default:
Damien Miller630d6f42002-01-22 23:17:30 +11002948 error("deny_input_open: type %d", type);
Damien Miller69b69aa2000-10-28 14:19:58 +11002949 break;
2950 }
2951 error("Warning: this is probably a break in attempt by a malicious server.");
2952 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
2953 packet_put_int(rchan);
2954 packet_send();
2955}
2956
Damien Miller5428f641999-11-25 11:54:57 +11002957/*
2958 * Requests forwarding of X11 connections, generates fake authentication
2959 * data, and enables authentication spoofing.
Ben Lindstrome9c99912001-06-09 00:41:05 +00002960 * This should be called in the client only.
Damien Miller5428f641999-11-25 11:54:57 +11002961 */
Damien Miller4af51302000-04-16 11:18:38 +10002962void
Damien Miller17e7ed02005-06-17 12:54:33 +10002963x11_request_forwarding_with_spoofing(int client_session_id, const char *disp,
Damien Millerbd483e72000-04-30 10:00:53 +10002964 const char *proto, const char *data)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002965{
Ben Lindstrom46c16222000-12-22 01:43:59 +00002966 u_int data_len = (u_int) strlen(data) / 2;
Damien Miller13390022005-07-06 09:44:19 +10002967 u_int i, value;
Damien Miller95def091999-11-25 00:26:21 +11002968 char *new_data;
2969 int screen_number;
2970 const char *cp;
Darren Tucker3f9fdc72004-06-22 12:56:01 +10002971 u_int32_t rnd = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002972
Damien Millerf92c0792005-07-06 09:45:26 +10002973 if (x11_saved_display == NULL)
2974 x11_saved_display = xstrdup(disp);
2975 else if (strcmp(disp, x11_saved_display) != 0) {
Damien Miller13390022005-07-06 09:44:19 +10002976 error("x11_request_forwarding_with_spoofing: different "
2977 "$DISPLAY already forwarded");
2978 return;
2979 }
2980
Damien Miller17e7ed02005-06-17 12:54:33 +10002981 cp = disp;
2982 if (disp)
2983 cp = strchr(disp, ':');
Damien Miller95def091999-11-25 00:26:21 +11002984 if (cp)
2985 cp = strchr(cp, '.');
2986 if (cp)
2987 screen_number = atoi(cp + 1);
2988 else
2989 screen_number = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002990
Damien Miller13390022005-07-06 09:44:19 +10002991 if (x11_saved_proto == NULL) {
2992 /* Save protocol name. */
2993 x11_saved_proto = xstrdup(proto);
2994 /*
Damien Miller46d38de2005-07-17 17:02:09 +10002995 * Extract real authentication data and generate fake data
Damien Miller13390022005-07-06 09:44:19 +10002996 * of the same length.
2997 */
2998 x11_saved_data = xmalloc(data_len);
2999 x11_fake_data = xmalloc(data_len);
3000 for (i = 0; i < data_len; i++) {
3001 if (sscanf(data + 2 * i, "%2x", &value) != 1)
3002 fatal("x11_request_forwarding: bad "
3003 "authentication data: %.100s", data);
3004 if (i % 4 == 0)
3005 rnd = arc4random();
3006 x11_saved_data[i] = value;
3007 x11_fake_data[i] = rnd & 0xff;
3008 rnd >>= 8;
3009 }
3010 x11_saved_data_len = data_len;
3011 x11_fake_data_len = data_len;
Damien Miller95def091999-11-25 00:26:21 +11003012 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003013
Damien Miller95def091999-11-25 00:26:21 +11003014 /* Convert the fake data into hex. */
Damien Miller13390022005-07-06 09:44:19 +10003015 new_data = tohex(x11_fake_data, data_len);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003016
Damien Miller95def091999-11-25 00:26:21 +11003017 /* Send the request packet. */
Damien Millerbd483e72000-04-30 10:00:53 +10003018 if (compat20) {
3019 channel_request_start(client_session_id, "x11-req", 0);
3020 packet_put_char(0); /* XXX bool single connection */
3021 } else {
3022 packet_start(SSH_CMSG_X11_REQUEST_FORWARDING);
3023 }
3024 packet_put_cstring(proto);
3025 packet_put_cstring(new_data);
Damien Miller95def091999-11-25 00:26:21 +11003026 packet_put_int(screen_number);
3027 packet_send();
3028 packet_write_wait();
3029 xfree(new_data);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003030}
3031
Ben Lindstrome9c99912001-06-09 00:41:05 +00003032
3033/* -- agent forwarding */
3034
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003035/* Sends a message to the server to request authentication fd forwarding. */
3036
Damien Miller4af51302000-04-16 11:18:38 +10003037void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00003038auth_request_forwarding(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003039{
Damien Miller95def091999-11-25 00:26:21 +11003040 packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING);
3041 packet_send();
3042 packet_write_wait();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003043}