blob: b431532a3c9aeda6e8f7dba7ffaf74b8115e018d [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 Miller5eb137c2005-12-31 16:19:53 +110042RCSID("$OpenBSD: channels.c,v 1.230 2005/12/28 22:46:06 stevesk 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 *
Damien Millerd47c62a2005-12-13 19:33:57 +1100145channel_by_id(int id)
Damien Millerb38eff82000-04-01 11:09:21 +1000146{
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 Millerd47c62a2005-12-13 19:33:57 +1100150 logit("channel_by_id: %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 Millerd47c62a2005-12-13 19:33:57 +1100155 logit("channel_by_id: %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 Millerd47c62a2005-12-13 19:33:57 +1100162 * Returns the channel if it is allowed to receive protocol messages.
163 * Private channels, like listening sockets, may not receive messages.
164 */
165Channel *
166channel_lookup(int id)
167{
168 Channel *c;
169
170 if ((c = channel_by_id(id)) == NULL)
171 return (NULL);
172
173 switch(c->type) {
174 case SSH_CHANNEL_X11_OPEN:
175 case SSH_CHANNEL_LARVAL:
176 case SSH_CHANNEL_CONNECTING:
177 case SSH_CHANNEL_DYNAMIC:
178 case SSH_CHANNEL_OPENING:
179 case SSH_CHANNEL_OPEN:
180 case SSH_CHANNEL_INPUT_DRAINING:
181 case SSH_CHANNEL_OUTPUT_DRAINING:
182 return (c);
183 break;
184 }
185 logit("Non-public channel %d, type %d.", id, c->type);
186 return (NULL);
187}
188
189/*
Damien Millere247cc42000-05-07 12:03:14 +1000190 * Register filedescriptors for a channel, used when allocating a channel or
Damien Miller6f83b8e2000-05-02 09:23:45 +1000191 * when the channel consumer/producer is ready, e.g. shell exec'd
Damien Miller5428f641999-11-25 11:54:57 +1100192 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000193
Ben Lindstrombba81212001-06-25 05:01:22 +0000194static void
Damien Miller69b69aa2000-10-28 14:19:58 +1100195channel_register_fds(Channel *c, int rfd, int wfd, int efd,
196 int extusage, int nonblock)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000197{
Damien Miller95def091999-11-25 00:26:21 +1100198 /* Update the maximum file descriptor value. */
Damien Miller5e953212001-01-30 09:14:00 +1100199 channel_max_fd = MAX(channel_max_fd, rfd);
200 channel_max_fd = MAX(channel_max_fd, wfd);
201 channel_max_fd = MAX(channel_max_fd, efd);
202
Damien Miller5428f641999-11-25 11:54:57 +1100203 /* XXX set close-on-exec -markus */
Damien Millere247cc42000-05-07 12:03:14 +1000204
Damien Miller6f83b8e2000-05-02 09:23:45 +1000205 c->rfd = rfd;
206 c->wfd = wfd;
207 c->sock = (rfd == wfd) ? rfd : -1;
Damien Miller0e220db2004-06-15 10:34:08 +1000208 c->ctl_fd = -1; /* XXX: set elsewhere */
Damien Miller6f83b8e2000-05-02 09:23:45 +1000209 c->efd = efd;
210 c->extended_usage = extusage;
Damien Miller69b69aa2000-10-28 14:19:58 +1100211
Damien Miller79438cc2001-02-16 12:34:57 +1100212 /* XXX ugly hack: nonblock is only set by the server */
213 if (nonblock && isatty(c->rfd)) {
Damien Millerfbdeece2003-09-02 22:52:31 +1000214 debug2("channel %d: rfd %d isatty", c->self, c->rfd);
Damien Miller79438cc2001-02-16 12:34:57 +1100215 c->isatty = 1;
216 if (!isatty(c->wfd)) {
Ben Lindstromcc74df72001-03-05 06:20:14 +0000217 error("channel %d: wfd %d is not a tty?",
Damien Miller79438cc2001-02-16 12:34:57 +1100218 c->self, c->wfd);
219 }
220 } else {
221 c->isatty = 0;
222 }
Ben Lindstrombeb5f332002-07-22 15:28:53 +0000223 c->wfd_isatty = isatty(c->wfd);
Damien Miller79438cc2001-02-16 12:34:57 +1100224
Damien Miller69b69aa2000-10-28 14:19:58 +1100225 /* enable nonblocking mode */
226 if (nonblock) {
227 if (rfd != -1)
228 set_nonblock(rfd);
229 if (wfd != -1)
230 set_nonblock(wfd);
231 if (efd != -1)
232 set_nonblock(efd);
233 }
Damien Miller6f83b8e2000-05-02 09:23:45 +1000234}
235
236/*
237 * Allocate a new channel object and set its type and socket. This will cause
238 * remote_name to be freed.
239 */
240
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000241Channel *
Damien Miller6f83b8e2000-05-02 09:23:45 +1000242channel_new(char *ctype, int type, int rfd, int wfd, int efd,
Ben Lindstrom4fed2be2002-06-25 23:17:36 +0000243 u_int window, u_int maxpack, int extusage, char *remote_name, int nonblock)
Damien Miller6f83b8e2000-05-02 09:23:45 +1000244{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000245 int found;
246 u_int i;
Damien Miller6f83b8e2000-05-02 09:23:45 +1000247 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000248
Damien Miller95def091999-11-25 00:26:21 +1100249 /* Do initial allocation if this is the first call. */
250 if (channels_alloc == 0) {
251 channels_alloc = 10;
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000252 channels = xmalloc(channels_alloc * sizeof(Channel *));
Damien Miller95def091999-11-25 00:26:21 +1100253 for (i = 0; i < channels_alloc; i++)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000254 channels[i] = NULL;
Damien Miller95def091999-11-25 00:26:21 +1100255 }
256 /* Try to find a free slot where to put the new channel. */
257 for (found = -1, i = 0; i < channels_alloc; i++)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000258 if (channels[i] == NULL) {
Damien Miller95def091999-11-25 00:26:21 +1100259 /* Found a free slot. */
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000260 found = (int)i;
Damien Miller95def091999-11-25 00:26:21 +1100261 break;
262 }
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000263 if (found < 0) {
Damien Miller5428f641999-11-25 11:54:57 +1100264 /* There are no free slots. Take last+1 slot and expand the array. */
Damien Miller95def091999-11-25 00:26:21 +1100265 found = channels_alloc;
Damien Miller9403aa22002-06-26 19:14:43 +1000266 if (channels_alloc > 10000)
267 fatal("channel_new: internal error: channels_alloc %d "
268 "too big.", channels_alloc);
Damien Miller5efcecc2003-09-17 07:31:14 +1000269 channels = xrealloc(channels,
270 (channels_alloc + 10) * sizeof(Channel *));
271 channels_alloc += 10;
Damien Millerd3444942000-09-30 14:20:03 +1100272 debug2("channel: expanding %d", channels_alloc);
Damien Miller95def091999-11-25 00:26:21 +1100273 for (i = found; i < channels_alloc; i++)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000274 channels[i] = NULL;
Damien Miller95def091999-11-25 00:26:21 +1100275 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000276 /* Initialize and return new channel. */
277 c = channels[found] = xmalloc(sizeof(Channel));
Damien Miller4623a752001-10-10 15:03:58 +1000278 memset(c, 0, sizeof(Channel));
Damien Miller95def091999-11-25 00:26:21 +1100279 buffer_init(&c->input);
280 buffer_init(&c->output);
Damien Millerb38eff82000-04-01 11:09:21 +1000281 buffer_init(&c->extended);
Damien Miller5144df92002-01-22 23:28:45 +1100282 c->ostate = CHAN_OUTPUT_OPEN;
283 c->istate = CHAN_INPUT_OPEN;
284 c->flags = 0;
Damien Miller69b69aa2000-10-28 14:19:58 +1100285 channel_register_fds(c, rfd, wfd, efd, extusage, nonblock);
Damien Miller95def091999-11-25 00:26:21 +1100286 c->self = found;
287 c->type = type;
Damien Millerb38eff82000-04-01 11:09:21 +1000288 c->ctype = ctype;
Damien Millerbd483e72000-04-30 10:00:53 +1000289 c->local_window = window;
290 c->local_window_max = window;
291 c->local_consumed = 0;
292 c->local_maxpacket = maxpack;
Damien Miller95def091999-11-25 00:26:21 +1100293 c->remote_id = -1;
Damien Millerb1ca8bb2003-05-14 13:45:42 +1000294 c->remote_name = xstrdup(remote_name);
Damien Millerb38eff82000-04-01 11:09:21 +1000295 c->remote_window = 0;
296 c->remote_maxpacket = 0;
Ben Lindstrom944c4f02001-09-18 05:51:13 +0000297 c->force_drain = 0;
Damien Millere7378562001-12-21 14:58:35 +1100298 c->single_connection = 0;
Ben Lindstrom809744e2001-07-04 05:26:06 +0000299 c->detach_user = NULL;
Damien Miller39eda6e2005-11-05 14:52:50 +1100300 c->detach_close = 0;
Damien Miller67f0bc02002-02-05 12:23:08 +1100301 c->confirm = NULL;
Damien Miller0e220db2004-06-15 10:34:08 +1000302 c->confirm_ctx = NULL;
Damien Millerad833b32000-08-23 10:46:23 +1000303 c->input_filter = NULL;
Damien Miller95def091999-11-25 00:26:21 +1100304 debug("channel %d: new [%s]", found, remote_name);
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000305 return c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000306}
Damien Miller6f83b8e2000-05-02 09:23:45 +1000307
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000308static int
309channel_find_maxfd(void)
310{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000311 u_int i;
312 int max = 0;
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000313 Channel *c;
314
315 for (i = 0; i < channels_alloc; i++) {
316 c = channels[i];
317 if (c != NULL) {
318 max = MAX(max, c->rfd);
319 max = MAX(max, c->wfd);
320 max = MAX(max, c->efd);
321 }
322 }
323 return max;
324}
325
326int
327channel_close_fd(int *fdp)
328{
329 int ret = 0, fd = *fdp;
330
331 if (fd != -1) {
332 ret = close(fd);
333 *fdp = -1;
334 if (fd == channel_max_fd)
335 channel_max_fd = channel_find_maxfd();
336 }
337 return ret;
338}
339
Damien Miller6f83b8e2000-05-02 09:23:45 +1000340/* Close all channel fd/socket. */
341
Ben Lindstrombba81212001-06-25 05:01:22 +0000342static void
Damien Miller6f83b8e2000-05-02 09:23:45 +1000343channel_close_fds(Channel *c)
344{
Damien Miller0e220db2004-06-15 10:34:08 +1000345 debug3("channel %d: close_fds r %d w %d e %d c %d",
346 c->self, c->rfd, c->wfd, c->efd, c->ctl_fd);
Ben Lindstromc0dee1a2001-06-05 20:52:50 +0000347
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000348 channel_close_fd(&c->sock);
Damien Miller0e220db2004-06-15 10:34:08 +1000349 channel_close_fd(&c->ctl_fd);
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000350 channel_close_fd(&c->rfd);
351 channel_close_fd(&c->wfd);
352 channel_close_fd(&c->efd);
Damien Miller6f83b8e2000-05-02 09:23:45 +1000353}
354
355/* Free the channel and close its fd/socket. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000356
Damien Miller4af51302000-04-16 11:18:38 +1000357void
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000358channel_free(Channel *c)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000359{
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000360 char *s;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000361 u_int i, n;
Ben Lindstromc0dee1a2001-06-05 20:52:50 +0000362
363 for (n = 0, i = 0; i < channels_alloc; i++)
364 if (channels[i])
365 n++;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000366 debug("channel %d: free: %s, nchannels %u", c->self,
Ben Lindstromc0dee1a2001-06-05 20:52:50 +0000367 c->remote_name ? c->remote_name : "???", n);
Ben Lindstrom6c3ae2b2000-12-30 03:25:14 +0000368
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000369 s = channel_open_message();
Damien Millerfbdeece2003-09-02 22:52:31 +1000370 debug3("channel %d: status: %s", c->self, s);
Ben Lindstrom6c3ae2b2000-12-30 03:25:14 +0000371 xfree(s);
372
Damien Miller6f83b8e2000-05-02 09:23:45 +1000373 if (c->sock != -1)
Damien Millerb38eff82000-04-01 11:09:21 +1000374 shutdown(c->sock, SHUT_RDWR);
Damien Miller0e220db2004-06-15 10:34:08 +1000375 if (c->ctl_fd != -1)
376 shutdown(c->ctl_fd, SHUT_RDWR);
Damien Miller6f83b8e2000-05-02 09:23:45 +1000377 channel_close_fds(c);
Damien Millerb38eff82000-04-01 11:09:21 +1000378 buffer_free(&c->input);
379 buffer_free(&c->output);
380 buffer_free(&c->extended);
Damien Millerb38eff82000-04-01 11:09:21 +1000381 if (c->remote_name) {
382 xfree(c->remote_name);
383 c->remote_name = NULL;
Damien Miller95def091999-11-25 00:26:21 +1100384 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000385 channels[c->self] = NULL;
386 xfree(c);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000387}
388
Ben Lindstrome9c99912001-06-09 00:41:05 +0000389void
Ben Lindstrom601e4362001-06-21 03:19:23 +0000390channel_free_all(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000391{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000392 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000393
Ben Lindstrom601e4362001-06-21 03:19:23 +0000394 for (i = 0; i < channels_alloc; i++)
395 if (channels[i] != NULL)
396 channel_free(channels[i]);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000397}
398
399/*
400 * Closes the sockets/fds of all channels. This is used to close extra file
401 * descriptors after a fork.
402 */
403
404void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000405channel_close_all(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000406{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000407 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000408
409 for (i = 0; i < channels_alloc; i++)
410 if (channels[i] != NULL)
411 channel_close_fds(channels[i]);
412}
413
414/*
Ben Lindstrom809744e2001-07-04 05:26:06 +0000415 * Stop listening to channels.
416 */
417
418void
419channel_stop_listening(void)
420{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000421 u_int i;
Ben Lindstrom809744e2001-07-04 05:26:06 +0000422 Channel *c;
423
424 for (i = 0; i < channels_alloc; i++) {
425 c = channels[i];
426 if (c != NULL) {
427 switch (c->type) {
428 case SSH_CHANNEL_AUTH_SOCKET:
429 case SSH_CHANNEL_PORT_LISTENER:
430 case SSH_CHANNEL_RPORT_LISTENER:
431 case SSH_CHANNEL_X11_LISTENER:
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000432 channel_close_fd(&c->sock);
Ben Lindstrom809744e2001-07-04 05:26:06 +0000433 channel_free(c);
434 break;
435 }
436 }
437 }
438}
439
440/*
Ben Lindstrome9c99912001-06-09 00:41:05 +0000441 * Returns true if no channel has too much buffered data, and false if one or
442 * more channel is overfull.
443 */
444
445int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000446channel_not_very_much_buffered_data(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000447{
448 u_int i;
449 Channel *c;
450
451 for (i = 0; i < channels_alloc; i++) {
452 c = channels[i];
453 if (c != NULL && c->type == SSH_CHANNEL_OPEN) {
Damien Milleraf5f2e62001-10-10 15:01:16 +1000454#if 0
455 if (!compat20 &&
456 buffer_len(&c->input) > packet_get_maxsize()) {
Damien Miller275295e2003-01-08 14:04:09 +1100457 debug2("channel %d: big input buffer %d",
Ben Lindstrome9c99912001-06-09 00:41:05 +0000458 c->self, buffer_len(&c->input));
459 return 0;
460 }
Damien Milleraf5f2e62001-10-10 15:01:16 +1000461#endif
Ben Lindstrome9c99912001-06-09 00:41:05 +0000462 if (buffer_len(&c->output) > packet_get_maxsize()) {
Darren Tucker502d3842003-06-28 12:38:01 +1000463 debug2("channel %d: big output buffer %u > %u",
Damien Milleraf5f2e62001-10-10 15:01:16 +1000464 c->self, buffer_len(&c->output),
465 packet_get_maxsize());
Ben Lindstrome9c99912001-06-09 00:41:05 +0000466 return 0;
467 }
468 }
469 }
470 return 1;
471}
472
473/* Returns true if any channel is still open. */
474
475int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000476channel_still_open(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000477{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000478 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000479 Channel *c;
480
481 for (i = 0; i < channels_alloc; i++) {
482 c = channels[i];
483 if (c == NULL)
484 continue;
485 switch (c->type) {
486 case SSH_CHANNEL_X11_LISTENER:
487 case SSH_CHANNEL_PORT_LISTENER:
488 case SSH_CHANNEL_RPORT_LISTENER:
489 case SSH_CHANNEL_CLOSED:
490 case SSH_CHANNEL_AUTH_SOCKET:
491 case SSH_CHANNEL_DYNAMIC:
492 case SSH_CHANNEL_CONNECTING:
493 case SSH_CHANNEL_ZOMBIE:
494 continue;
495 case SSH_CHANNEL_LARVAL:
496 if (!compat20)
497 fatal("cannot happen: SSH_CHANNEL_LARVAL");
498 continue;
499 case SSH_CHANNEL_OPENING:
500 case SSH_CHANNEL_OPEN:
501 case SSH_CHANNEL_X11_OPEN:
502 return 1;
503 case SSH_CHANNEL_INPUT_DRAINING:
504 case SSH_CHANNEL_OUTPUT_DRAINING:
505 if (!compat13)
506 fatal("cannot happen: OUT_DRAIN");
507 return 1;
508 default:
509 fatal("channel_still_open: bad channel type %d", c->type);
510 /* NOTREACHED */
511 }
512 }
513 return 0;
514}
515
516/* Returns the id of an open channel suitable for keepaliving */
517
518int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000519channel_find_open(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000520{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000521 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000522 Channel *c;
523
524 for (i = 0; i < channels_alloc; i++) {
525 c = channels[i];
Damien Miller3bbd8782004-06-18 22:23:22 +1000526 if (c == NULL || c->remote_id < 0)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000527 continue;
528 switch (c->type) {
529 case SSH_CHANNEL_CLOSED:
530 case SSH_CHANNEL_DYNAMIC:
531 case SSH_CHANNEL_X11_LISTENER:
532 case SSH_CHANNEL_PORT_LISTENER:
533 case SSH_CHANNEL_RPORT_LISTENER:
534 case SSH_CHANNEL_OPENING:
535 case SSH_CHANNEL_CONNECTING:
536 case SSH_CHANNEL_ZOMBIE:
537 continue;
538 case SSH_CHANNEL_LARVAL:
539 case SSH_CHANNEL_AUTH_SOCKET:
540 case SSH_CHANNEL_OPEN:
541 case SSH_CHANNEL_X11_OPEN:
542 return i;
543 case SSH_CHANNEL_INPUT_DRAINING:
544 case SSH_CHANNEL_OUTPUT_DRAINING:
545 if (!compat13)
546 fatal("cannot happen: OUT_DRAIN");
547 return i;
548 default:
549 fatal("channel_find_open: bad channel type %d", c->type);
550 /* NOTREACHED */
551 }
552 }
553 return -1;
554}
555
556
557/*
558 * Returns a message describing the currently open forwarded connections,
559 * suitable for sending to the client. The message contains crlf pairs for
560 * newlines.
561 */
562
563char *
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000564channel_open_message(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000565{
566 Buffer buffer;
567 Channel *c;
568 char buf[1024], *cp;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000569 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000570
571 buffer_init(&buffer);
572 snprintf(buf, sizeof buf, "The following connections are open:\r\n");
573 buffer_append(&buffer, buf, strlen(buf));
574 for (i = 0; i < channels_alloc; i++) {
575 c = channels[i];
576 if (c == NULL)
577 continue;
578 switch (c->type) {
579 case SSH_CHANNEL_X11_LISTENER:
580 case SSH_CHANNEL_PORT_LISTENER:
581 case SSH_CHANNEL_RPORT_LISTENER:
582 case SSH_CHANNEL_CLOSED:
583 case SSH_CHANNEL_AUTH_SOCKET:
584 case SSH_CHANNEL_ZOMBIE:
585 continue;
586 case SSH_CHANNEL_LARVAL:
587 case SSH_CHANNEL_OPENING:
588 case SSH_CHANNEL_CONNECTING:
589 case SSH_CHANNEL_DYNAMIC:
590 case SSH_CHANNEL_OPEN:
591 case SSH_CHANNEL_X11_OPEN:
592 case SSH_CHANNEL_INPUT_DRAINING:
593 case SSH_CHANNEL_OUTPUT_DRAINING:
Damien Miller0e220db2004-06-15 10:34:08 +1000594 snprintf(buf, sizeof buf,
595 " #%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 +0000596 c->self, c->remote_name,
597 c->type, c->remote_id,
598 c->istate, buffer_len(&c->input),
599 c->ostate, buffer_len(&c->output),
Damien Miller0e220db2004-06-15 10:34:08 +1000600 c->rfd, c->wfd, c->ctl_fd);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000601 buffer_append(&buffer, buf, strlen(buf));
602 continue;
603 default:
604 fatal("channel_open_message: bad channel type %d", c->type);
605 /* NOTREACHED */
606 }
607 }
608 buffer_append(&buffer, "\0", 1);
609 cp = xstrdup(buffer_ptr(&buffer));
610 buffer_free(&buffer);
611 return cp;
612}
613
614void
615channel_send_open(int id)
616{
617 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000618
Ben Lindstrome9c99912001-06-09 00:41:05 +0000619 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000620 logit("channel_send_open: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000621 return;
622 }
Ben Lindstrom1d568f92002-12-23 02:44:36 +0000623 debug2("channel %d: send open", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000624 packet_start(SSH2_MSG_CHANNEL_OPEN);
625 packet_put_cstring(c->ctype);
626 packet_put_int(c->self);
627 packet_put_int(c->local_window);
628 packet_put_int(c->local_maxpacket);
629 packet_send();
630}
631
632void
Ben Lindstrom1d568f92002-12-23 02:44:36 +0000633channel_request_start(int id, char *service, int wantconfirm)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000634{
Ben Lindstrom1d568f92002-12-23 02:44:36 +0000635 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000636
Ben Lindstrome9c99912001-06-09 00:41:05 +0000637 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000638 logit("channel_request_start: %d: unknown channel id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000639 return;
640 }
Damien Miller0e220db2004-06-15 10:34:08 +1000641 debug2("channel %d: request %s confirm %d", id, service, wantconfirm);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000642 packet_start(SSH2_MSG_CHANNEL_REQUEST);
643 packet_put_int(c->remote_id);
644 packet_put_cstring(service);
645 packet_put_char(wantconfirm);
646}
647void
Damien Miller0e220db2004-06-15 10:34:08 +1000648channel_register_confirm(int id, channel_callback_fn *fn, void *ctx)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000649{
650 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000651
Ben Lindstrome9c99912001-06-09 00:41:05 +0000652 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000653 logit("channel_register_comfirm: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000654 return;
655 }
Damien Miller67f0bc02002-02-05 12:23:08 +1100656 c->confirm = fn;
Damien Miller0e220db2004-06-15 10:34:08 +1000657 c->confirm_ctx = ctx;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000658}
659void
Damien Miller39eda6e2005-11-05 14:52:50 +1100660channel_register_cleanup(int id, channel_callback_fn *fn, int do_close)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000661{
Damien Millerd47c62a2005-12-13 19:33:57 +1100662 Channel *c = channel_by_id(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000663
Ben Lindstrome9c99912001-06-09 00:41:05 +0000664 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000665 logit("channel_register_cleanup: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000666 return;
667 }
Ben Lindstrom809744e2001-07-04 05:26:06 +0000668 c->detach_user = fn;
Damien Miller39eda6e2005-11-05 14:52:50 +1100669 c->detach_close = do_close;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000670}
671void
672channel_cancel_cleanup(int id)
673{
Damien Millerd47c62a2005-12-13 19:33:57 +1100674 Channel *c = channel_by_id(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000675
Ben Lindstrome9c99912001-06-09 00:41:05 +0000676 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000677 logit("channel_cancel_cleanup: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000678 return;
679 }
Ben Lindstrom809744e2001-07-04 05:26:06 +0000680 c->detach_user = NULL;
Damien Miller39eda6e2005-11-05 14:52:50 +1100681 c->detach_close = 0;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000682}
683void
684channel_register_filter(int id, channel_filter_fn *fn)
685{
686 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000687
Ben Lindstrome9c99912001-06-09 00:41:05 +0000688 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000689 logit("channel_register_filter: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000690 return;
691 }
692 c->input_filter = fn;
693}
694
695void
696channel_set_fds(int id, int rfd, int wfd, int efd,
Damien Miller2aa0c192002-02-19 15:20:08 +1100697 int extusage, int nonblock, u_int window_max)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000698{
699 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000700
Ben Lindstrome9c99912001-06-09 00:41:05 +0000701 if (c == NULL || c->type != SSH_CHANNEL_LARVAL)
702 fatal("channel_activate for non-larval channel %d.", id);
703 channel_register_fds(c, rfd, wfd, efd, extusage, nonblock);
704 c->type = SSH_CHANNEL_OPEN;
Damien Miller2aa0c192002-02-19 15:20:08 +1100705 c->local_window = c->local_window_max = window_max;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000706 packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
707 packet_put_int(c->remote_id);
708 packet_put_int(c->local_window);
709 packet_send();
710}
711
Damien Miller5428f641999-11-25 11:54:57 +1100712/*
Damien Millerb38eff82000-04-01 11:09:21 +1000713 * 'channel_pre*' are called just before select() to add any bits relevant to
714 * channels in the select bitmasks.
Damien Miller5428f641999-11-25 11:54:57 +1100715 */
Damien Millerb38eff82000-04-01 11:09:21 +1000716/*
717 * 'channel_post*': perform any appropriate operations for channels which
718 * have events pending.
719 */
720typedef void chan_fn(Channel *c, fd_set * readset, fd_set * writeset);
721chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE];
722chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE];
723
Ben Lindstrombba81212001-06-25 05:01:22 +0000724static void
Damien Millerb38eff82000-04-01 11:09:21 +1000725channel_pre_listener(Channel *c, fd_set * readset, fd_set * writeset)
726{
727 FD_SET(c->sock, readset);
728}
729
Ben Lindstrombba81212001-06-25 05:01:22 +0000730static void
Ben Lindstrom7ad97102000-12-06 01:42:49 +0000731channel_pre_connecting(Channel *c, fd_set * readset, fd_set * writeset)
732{
733 debug3("channel %d: waiting for connection", c->self);
734 FD_SET(c->sock, writeset);
735}
736
Ben Lindstrombba81212001-06-25 05:01:22 +0000737static void
Damien Millerb38eff82000-04-01 11:09:21 +1000738channel_pre_open_13(Channel *c, fd_set * readset, fd_set * writeset)
739{
740 if (buffer_len(&c->input) < packet_get_maxsize())
741 FD_SET(c->sock, readset);
742 if (buffer_len(&c->output) > 0)
743 FD_SET(c->sock, writeset);
744}
745
Ben Lindstrombba81212001-06-25 05:01:22 +0000746static void
Damien Millerde6987c2002-01-22 23:20:40 +1100747channel_pre_open(Channel *c, fd_set * readset, fd_set * writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000748{
Damien Millerde6987c2002-01-22 23:20:40 +1100749 u_int limit = compat20 ? c->remote_window : packet_get_maxsize();
Damien Millerb38eff82000-04-01 11:09:21 +1000750
Darren Tucker11327cc2005-03-14 23:22:25 +1100751 /* check buffer limits */
752 limit = MIN(limit, (BUFFER_MAX_LEN - BUFFER_MAX_CHUNK - CHAN_RBUF));
753
Damien Miller33b13562000-04-04 14:38:59 +1000754 if (c->istate == CHAN_INPUT_OPEN &&
Damien Millerde6987c2002-01-22 23:20:40 +1100755 limit > 0 &&
756 buffer_len(&c->input) < limit)
Damien Miller33b13562000-04-04 14:38:59 +1000757 FD_SET(c->rfd, readset);
758 if (c->ostate == CHAN_OUTPUT_OPEN ||
759 c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
760 if (buffer_len(&c->output) > 0) {
761 FD_SET(c->wfd, writeset);
762 } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
Ben Lindstromcf159442002-03-26 03:26:24 +0000763 if (CHANNEL_EFD_OUTPUT_ACTIVE(c))
Damien Miller0dc1bef2005-07-17 17:22:45 +1000764 debug2("channel %d: obuf_empty delayed efd %d/(%d)",
765 c->self, c->efd, buffer_len(&c->extended));
Ben Lindstromcf159442002-03-26 03:26:24 +0000766 else
767 chan_obuf_empty(c);
Damien Miller33b13562000-04-04 14:38:59 +1000768 }
769 }
770 /** XXX check close conditions, too */
Damien Millerde6987c2002-01-22 23:20:40 +1100771 if (compat20 && c->efd != -1) {
Damien Miller33b13562000-04-04 14:38:59 +1000772 if (c->extended_usage == CHAN_EXTENDED_WRITE &&
773 buffer_len(&c->extended) > 0)
774 FD_SET(c->efd, writeset);
Ben Lindstromcf159442002-03-26 03:26:24 +0000775 else if (!(c->flags & CHAN_EOF_SENT) &&
776 c->extended_usage == CHAN_EXTENDED_READ &&
Damien Miller33b13562000-04-04 14:38:59 +1000777 buffer_len(&c->extended) < c->remote_window)
778 FD_SET(c->efd, readset);
779 }
Damien Miller0e220db2004-06-15 10:34:08 +1000780 /* XXX: What about efd? races? */
Darren Tuckerfc959702004-07-17 16:12:08 +1000781 if (compat20 && c->ctl_fd != -1 &&
Damien Miller0e220db2004-06-15 10:34:08 +1000782 c->istate == CHAN_INPUT_OPEN && c->ostate == CHAN_OUTPUT_OPEN)
783 FD_SET(c->ctl_fd, readset);
Damien Miller33b13562000-04-04 14:38:59 +1000784}
785
Ben Lindstrombba81212001-06-25 05:01:22 +0000786static void
Damien Millerb38eff82000-04-01 11:09:21 +1000787channel_pre_input_draining(Channel *c, fd_set * readset, fd_set * writeset)
788{
789 if (buffer_len(&c->input) == 0) {
790 packet_start(SSH_MSG_CHANNEL_CLOSE);
791 packet_put_int(c->remote_id);
792 packet_send();
793 c->type = SSH_CHANNEL_CLOSED;
Damien Millerfbdeece2003-09-02 22:52:31 +1000794 debug2("channel %d: closing after input drain.", c->self);
Damien Millerb38eff82000-04-01 11:09:21 +1000795 }
796}
797
Ben Lindstrombba81212001-06-25 05:01:22 +0000798static void
Damien Millerb38eff82000-04-01 11:09:21 +1000799channel_pre_output_draining(Channel *c, fd_set * readset, fd_set * writeset)
800{
801 if (buffer_len(&c->output) == 0)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000802 chan_mark_dead(c);
Damien Miller4af51302000-04-16 11:18:38 +1000803 else
Damien Millerb38eff82000-04-01 11:09:21 +1000804 FD_SET(c->sock, writeset);
805}
806
807/*
808 * This is a special state for X11 authentication spoofing. An opened X11
809 * connection (when authentication spoofing is being done) remains in this
810 * state until the first packet has been completely read. The authentication
811 * data in that packet is then substituted by the real data if it matches the
812 * fake data, and the channel is put into normal mode.
Damien Millerbd483e72000-04-30 10:00:53 +1000813 * XXX All this happens at the client side.
Ben Lindstrome9c99912001-06-09 00:41:05 +0000814 * Returns: 0 = need more data, -1 = wrong cookie, 1 = ok
Damien Millerb38eff82000-04-01 11:09:21 +1000815 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000816static int
Ben Lindstrome9c99912001-06-09 00:41:05 +0000817x11_open_helper(Buffer *b)
Damien Millerb38eff82000-04-01 11:09:21 +1000818{
Ben Lindstrom46c16222000-12-22 01:43:59 +0000819 u_char *ucp;
820 u_int proto_len, data_len;
Damien Millerb38eff82000-04-01 11:09:21 +1000821
822 /* Check if the fixed size part of the packet is in buffer. */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000823 if (buffer_len(b) < 12)
Damien Millerb38eff82000-04-01 11:09:21 +1000824 return 0;
825
826 /* Parse the lengths of variable-length fields. */
Damien Miller708d21c2002-01-22 23:18:15 +1100827 ucp = buffer_ptr(b);
Damien Millerb38eff82000-04-01 11:09:21 +1000828 if (ucp[0] == 0x42) { /* Byte order MSB first. */
829 proto_len = 256 * ucp[6] + ucp[7];
830 data_len = 256 * ucp[8] + ucp[9];
831 } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */
832 proto_len = ucp[6] + 256 * ucp[7];
833 data_len = ucp[8] + 256 * ucp[9];
834 } else {
Damien Millerfbdeece2003-09-02 22:52:31 +1000835 debug2("Initial X11 packet contains bad byte order byte: 0x%x",
Damien Miller9f0f5c62001-12-21 14:45:46 +1100836 ucp[0]);
Damien Millerb38eff82000-04-01 11:09:21 +1000837 return -1;
838 }
839
840 /* Check if the whole packet is in buffer. */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000841 if (buffer_len(b) <
Damien Millerb38eff82000-04-01 11:09:21 +1000842 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3))
843 return 0;
844
845 /* Check if authentication protocol matches. */
846 if (proto_len != strlen(x11_saved_proto) ||
847 memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +1000848 debug2("X11 connection uses different authentication protocol.");
Damien Millerb38eff82000-04-01 11:09:21 +1000849 return -1;
850 }
851 /* Check if authentication data matches our fake data. */
852 if (data_len != x11_fake_data_len ||
853 memcmp(ucp + 12 + ((proto_len + 3) & ~3),
854 x11_fake_data, x11_fake_data_len) != 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +1000855 debug2("X11 auth data does not match fake data.");
Damien Millerb38eff82000-04-01 11:09:21 +1000856 return -1;
857 }
858 /* Check fake data length */
859 if (x11_fake_data_len != x11_saved_data_len) {
860 error("X11 fake_data_len %d != saved_data_len %d",
861 x11_fake_data_len, x11_saved_data_len);
862 return -1;
863 }
864 /*
865 * Received authentication protocol and data match
866 * our fake data. Substitute the fake data with real
867 * data.
868 */
869 memcpy(ucp + 12 + ((proto_len + 3) & ~3),
870 x11_saved_data, x11_saved_data_len);
871 return 1;
872}
873
Ben Lindstrombba81212001-06-25 05:01:22 +0000874static void
Damien Millerb38eff82000-04-01 11:09:21 +1000875channel_pre_x11_open_13(Channel *c, fd_set * readset, fd_set * writeset)
876{
Ben Lindstrome9c99912001-06-09 00:41:05 +0000877 int ret = x11_open_helper(&c->output);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000878
Damien Millerb38eff82000-04-01 11:09:21 +1000879 if (ret == 1) {
880 /* Start normal processing for the channel. */
881 c->type = SSH_CHANNEL_OPEN;
Damien Miller78928792000-04-12 20:17:38 +1000882 channel_pre_open_13(c, readset, writeset);
Damien Millerb38eff82000-04-01 11:09:21 +1000883 } else if (ret == -1) {
884 /*
885 * We have received an X11 connection that has bad
886 * authentication information.
887 */
Damien Miller996acd22003-04-09 20:59:48 +1000888 logit("X11 connection rejected because of wrong authentication.");
Damien Millerb38eff82000-04-01 11:09:21 +1000889 buffer_clear(&c->input);
890 buffer_clear(&c->output);
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000891 channel_close_fd(&c->sock);
Damien Millerb38eff82000-04-01 11:09:21 +1000892 c->sock = -1;
893 c->type = SSH_CHANNEL_CLOSED;
894 packet_start(SSH_MSG_CHANNEL_CLOSE);
895 packet_put_int(c->remote_id);
896 packet_send();
897 }
898}
899
Ben Lindstrombba81212001-06-25 05:01:22 +0000900static void
Damien Millerbd483e72000-04-30 10:00:53 +1000901channel_pre_x11_open(Channel *c, fd_set * readset, fd_set * writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000902{
Ben Lindstrome9c99912001-06-09 00:41:05 +0000903 int ret = x11_open_helper(&c->output);
Ben Lindstrom944c4f02001-09-18 05:51:13 +0000904
905 /* c->force_drain = 1; */
906
Damien Millerb38eff82000-04-01 11:09:21 +1000907 if (ret == 1) {
908 c->type = SSH_CHANNEL_OPEN;
Damien Millerde6987c2002-01-22 23:20:40 +1100909 channel_pre_open(c, readset, writeset);
Damien Millerb38eff82000-04-01 11:09:21 +1000910 } else if (ret == -1) {
Damien Miller996acd22003-04-09 20:59:48 +1000911 logit("X11 connection rejected because of wrong authentication.");
Damien Millerfbdeece2003-09-02 22:52:31 +1000912 debug2("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate);
Damien Millera90fc082002-01-22 23:19:38 +1100913 chan_read_failed(c);
914 buffer_clear(&c->input);
915 chan_ibuf_empty(c);
916 buffer_clear(&c->output);
917 /* for proto v1, the peer will send an IEOF */
918 if (compat20)
919 chan_write_failed(c);
920 else
921 c->type = SSH_CHANNEL_OPEN;
Damien Millerfbdeece2003-09-02 22:52:31 +1000922 debug2("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate);
Damien Millerb38eff82000-04-01 11:09:21 +1000923 }
924}
925
Ben Lindstromb3921512001-04-11 15:57:50 +0000926/* try to decode a socks4 header */
Ben Lindstrombba81212001-06-25 05:01:22 +0000927static int
Ben Lindstromb3921512001-04-11 15:57:50 +0000928channel_decode_socks4(Channel *c, fd_set * readset, fd_set * writeset)
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000929{
Damien Millera10f5612002-09-12 09:49:15 +1000930 char *p, *host;
Damien Millereccb9de2005-06-17 12:59:34 +1000931 u_int len, have, i, found;
Damien Miller9f0f5c62001-12-21 14:45:46 +1100932 char username[256];
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000933 struct {
934 u_int8_t version;
935 u_int8_t command;
936 u_int16_t dest_port;
Ben Lindstromb3921512001-04-11 15:57:50 +0000937 struct in_addr dest_addr;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000938 } s4_req, s4_rsp;
939
Ben Lindstromb3921512001-04-11 15:57:50 +0000940 debug2("channel %d: decode socks4", c->self);
Ben Lindstrom2b261b92001-04-17 18:14:34 +0000941
942 have = buffer_len(&c->input);
943 len = sizeof(s4_req);
944 if (have < len)
945 return 0;
946 p = buffer_ptr(&c->input);
947 for (found = 0, i = len; i < have; i++) {
948 if (p[i] == '\0') {
949 found = 1;
950 break;
951 }
952 if (i > 1024) {
953 /* the peer is probably sending garbage */
954 debug("channel %d: decode socks4: too long",
955 c->self);
956 return -1;
957 }
958 }
959 if (!found)
960 return 0;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000961 buffer_get(&c->input, (char *)&s4_req.version, 1);
962 buffer_get(&c->input, (char *)&s4_req.command, 1);
963 buffer_get(&c->input, (char *)&s4_req.dest_port, 2);
Ben Lindstromb3921512001-04-11 15:57:50 +0000964 buffer_get(&c->input, (char *)&s4_req.dest_addr, 4);
Ben Lindstrom2b261b92001-04-17 18:14:34 +0000965 have = buffer_len(&c->input);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000966 p = buffer_ptr(&c->input);
967 len = strlen(p);
Ben Lindstrom6fa9d102001-04-11 23:08:17 +0000968 debug2("channel %d: decode socks4: user %s/%d", c->self, p, len);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000969 if (len > have)
Ben Lindstromb3921512001-04-11 15:57:50 +0000970 fatal("channel %d: decode socks4: len %d > have %d",
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000971 c->self, len, have);
972 strlcpy(username, p, sizeof(username));
973 buffer_consume(&c->input, len);
974 buffer_consume(&c->input, 1); /* trailing '\0' */
975
Ben Lindstromb3921512001-04-11 15:57:50 +0000976 host = inet_ntoa(s4_req.dest_addr);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000977 strlcpy(c->path, host, sizeof(c->path));
978 c->host_port = ntohs(s4_req.dest_port);
Damien Miller9f0f5c62001-12-21 14:45:46 +1100979
Damien Millerfbdeece2003-09-02 22:52:31 +1000980 debug2("channel %d: dynamic request: socks4 host %s port %u command %u",
Ben Lindstrom6fa9d102001-04-11 23:08:17 +0000981 c->self, host, c->host_port, s4_req.command);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000982
Ben Lindstromb3921512001-04-11 15:57:50 +0000983 if (s4_req.command != 1) {
984 debug("channel %d: cannot handle: socks4 cn %d",
985 c->self, s4_req.command);
986 return -1;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000987 }
Ben Lindstromb3921512001-04-11 15:57:50 +0000988 s4_rsp.version = 0; /* vn: 0 for reply */
989 s4_rsp.command = 90; /* cd: req granted */
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000990 s4_rsp.dest_port = 0; /* ignored */
Ben Lindstromb3921512001-04-11 15:57:50 +0000991 s4_rsp.dest_addr.s_addr = INADDR_ANY; /* ignored */
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000992 buffer_append(&c->output, (char *)&s4_rsp, sizeof(s4_rsp));
Ben Lindstromb3921512001-04-11 15:57:50 +0000993 return 1;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000994}
995
Darren Tucker46471c92003-07-03 13:55:19 +1000996/* try to decode a socks5 header */
997#define SSH_SOCKS5_AUTHDONE 0x1000
998#define SSH_SOCKS5_NOAUTH 0x00
999#define SSH_SOCKS5_IPV4 0x01
1000#define SSH_SOCKS5_DOMAIN 0x03
1001#define SSH_SOCKS5_IPV6 0x04
1002#define SSH_SOCKS5_CONNECT 0x01
1003#define SSH_SOCKS5_SUCCESS 0x00
1004
1005static int
1006channel_decode_socks5(Channel *c, fd_set * readset, fd_set * writeset)
1007{
1008 struct {
1009 u_int8_t version;
1010 u_int8_t command;
1011 u_int8_t reserved;
1012 u_int8_t atyp;
1013 } s5_req, s5_rsp;
1014 u_int16_t dest_port;
1015 u_char *p, dest_addr[255+1];
Damien Millereccb9de2005-06-17 12:59:34 +10001016 u_int have, i, found, nmethods, addrlen, af;
Darren Tucker46471c92003-07-03 13:55:19 +10001017
1018 debug2("channel %d: decode socks5", c->self);
1019 p = buffer_ptr(&c->input);
1020 if (p[0] != 0x05)
1021 return -1;
1022 have = buffer_len(&c->input);
1023 if (!(c->flags & SSH_SOCKS5_AUTHDONE)) {
1024 /* format: ver | nmethods | methods */
Damien Millera8e06ce2003-11-21 23:48:55 +11001025 if (have < 2)
Darren Tucker46471c92003-07-03 13:55:19 +10001026 return 0;
1027 nmethods = p[1];
1028 if (have < nmethods + 2)
1029 return 0;
1030 /* look for method: "NO AUTHENTICATION REQUIRED" */
1031 for (found = 0, i = 2 ; i < nmethods + 2; i++) {
1032 if (p[i] == SSH_SOCKS5_NOAUTH ) {
1033 found = 1;
1034 break;
1035 }
1036 }
1037 if (!found) {
1038 debug("channel %d: method SSH_SOCKS5_NOAUTH not found",
1039 c->self);
1040 return -1;
1041 }
1042 buffer_consume(&c->input, nmethods + 2);
1043 buffer_put_char(&c->output, 0x05); /* version */
1044 buffer_put_char(&c->output, SSH_SOCKS5_NOAUTH); /* method */
1045 FD_SET(c->sock, writeset);
1046 c->flags |= SSH_SOCKS5_AUTHDONE;
1047 debug2("channel %d: socks5 auth done", c->self);
1048 return 0; /* need more */
1049 }
1050 debug2("channel %d: socks5 post auth", c->self);
1051 if (have < sizeof(s5_req)+1)
1052 return 0; /* need more */
1053 memcpy((char *)&s5_req, p, sizeof(s5_req));
1054 if (s5_req.version != 0x05 ||
1055 s5_req.command != SSH_SOCKS5_CONNECT ||
1056 s5_req.reserved != 0x00) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001057 debug2("channel %d: only socks5 connect supported", c->self);
Darren Tucker46471c92003-07-03 13:55:19 +10001058 return -1;
1059 }
Darren Tucker47eede72005-03-14 23:08:12 +11001060 switch (s5_req.atyp){
Darren Tucker46471c92003-07-03 13:55:19 +10001061 case SSH_SOCKS5_IPV4:
1062 addrlen = 4;
1063 af = AF_INET;
1064 break;
1065 case SSH_SOCKS5_DOMAIN:
1066 addrlen = p[sizeof(s5_req)];
1067 af = -1;
1068 break;
1069 case SSH_SOCKS5_IPV6:
1070 addrlen = 16;
1071 af = AF_INET6;
1072 break;
1073 default:
Damien Millerfbdeece2003-09-02 22:52:31 +10001074 debug2("channel %d: bad socks5 atyp %d", c->self, s5_req.atyp);
Darren Tucker46471c92003-07-03 13:55:19 +10001075 return -1;
1076 }
1077 if (have < 4 + addrlen + 2)
1078 return 0;
1079 buffer_consume(&c->input, sizeof(s5_req));
1080 if (s5_req.atyp == SSH_SOCKS5_DOMAIN)
1081 buffer_consume(&c->input, 1); /* host string length */
1082 buffer_get(&c->input, (char *)&dest_addr, addrlen);
1083 buffer_get(&c->input, (char *)&dest_port, 2);
1084 dest_addr[addrlen] = '\0';
1085 if (s5_req.atyp == SSH_SOCKS5_DOMAIN)
Darren Tucker1f8311c2004-05-13 16:39:33 +10001086 strlcpy(c->path, (char *)dest_addr, sizeof(c->path));
Darren Tucker46471c92003-07-03 13:55:19 +10001087 else if (inet_ntop(af, dest_addr, c->path, sizeof(c->path)) == NULL)
1088 return -1;
1089 c->host_port = ntohs(dest_port);
Damien Miller787b2ec2003-11-21 23:56:47 +11001090
Damien Millerfbdeece2003-09-02 22:52:31 +10001091 debug2("channel %d: dynamic request: socks5 host %s port %u command %u",
Darren Tucker46471c92003-07-03 13:55:19 +10001092 c->self, c->path, c->host_port, s5_req.command);
1093
1094 s5_rsp.version = 0x05;
1095 s5_rsp.command = SSH_SOCKS5_SUCCESS;
1096 s5_rsp.reserved = 0; /* ignored */
1097 s5_rsp.atyp = SSH_SOCKS5_IPV4;
1098 ((struct in_addr *)&dest_addr)->s_addr = INADDR_ANY;
1099 dest_port = 0; /* ignored */
1100
1101 buffer_append(&c->output, (char *)&s5_rsp, sizeof(s5_rsp));
1102 buffer_append(&c->output, (char *)&dest_addr, sizeof(struct in_addr));
1103 buffer_append(&c->output, (char *)&dest_port, sizeof(dest_port));
1104 return 1;
1105}
1106
Ben Lindstromb3921512001-04-11 15:57:50 +00001107/* dynamic port forwarding */
Ben Lindstrombba81212001-06-25 05:01:22 +00001108static void
Ben Lindstromb3921512001-04-11 15:57:50 +00001109channel_pre_dynamic(Channel *c, fd_set * readset, fd_set * writeset)
1110{
1111 u_char *p;
Damien Millereccb9de2005-06-17 12:59:34 +10001112 u_int have;
1113 int ret;
Ben Lindstromb3921512001-04-11 15:57:50 +00001114
1115 have = buffer_len(&c->input);
Damien Miller4623a752001-10-10 15:03:58 +10001116 c->delayed = 0;
Ben Lindstromb3921512001-04-11 15:57:50 +00001117 debug2("channel %d: pre_dynamic: have %d", c->self, have);
Ben Lindstromc486d882001-04-11 16:08:34 +00001118 /* buffer_dump(&c->input); */
Ben Lindstromb3921512001-04-11 15:57:50 +00001119 /* check if the fixed size part of the packet is in buffer. */
Darren Tucker46471c92003-07-03 13:55:19 +10001120 if (have < 3) {
Ben Lindstromb3921512001-04-11 15:57:50 +00001121 /* need more */
1122 FD_SET(c->sock, readset);
1123 return;
1124 }
1125 /* try to guess the protocol */
1126 p = buffer_ptr(&c->input);
1127 switch (p[0]) {
Ben Lindstrom6fa9d102001-04-11 23:08:17 +00001128 case 0x04:
1129 ret = channel_decode_socks4(c, readset, writeset);
1130 break;
Darren Tucker46471c92003-07-03 13:55:19 +10001131 case 0x05:
1132 ret = channel_decode_socks5(c, readset, writeset);
1133 break;
Ben Lindstromb3921512001-04-11 15:57:50 +00001134 default:
1135 ret = -1;
1136 break;
1137 }
1138 if (ret < 0) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001139 chan_mark_dead(c);
Ben Lindstromb3921512001-04-11 15:57:50 +00001140 } else if (ret == 0) {
1141 debug2("channel %d: pre_dynamic: need more", c->self);
1142 /* need more */
1143 FD_SET(c->sock, readset);
1144 } else {
1145 /* switch to the next state */
1146 c->type = SSH_CHANNEL_OPENING;
1147 port_open_helper(c, "direct-tcpip");
1148 }
1149}
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001150
Damien Millerb38eff82000-04-01 11:09:21 +10001151/* This is our fake X11 server socket. */
Ben Lindstrombba81212001-06-25 05:01:22 +00001152static void
Damien Millerb38eff82000-04-01 11:09:21 +10001153channel_post_x11_listener(Channel *c, fd_set * readset, fd_set * writeset)
1154{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001155 Channel *nc;
Damien Millerb38eff82000-04-01 11:09:21 +10001156 struct sockaddr addr;
Damien Miller398e1cf2002-02-05 11:52:13 +11001157 int newsock;
Damien Millerb38eff82000-04-01 11:09:21 +10001158 socklen_t addrlen;
Damien Millerd83ff352001-01-30 09:19:34 +11001159 char buf[16384], *remote_ipaddr;
Damien Millerbd483e72000-04-30 10:00:53 +10001160 int remote_port;
Damien Millerb38eff82000-04-01 11:09:21 +10001161
1162 if (FD_ISSET(c->sock, readset)) {
1163 debug("X11 connection requested.");
1164 addrlen = sizeof(addr);
1165 newsock = accept(c->sock, &addr, &addrlen);
Damien Millere7378562001-12-21 14:58:35 +11001166 if (c->single_connection) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001167 debug2("single_connection: closing X11 listener.");
Damien Millere7378562001-12-21 14:58:35 +11001168 channel_close_fd(&c->sock);
1169 chan_mark_dead(c);
1170 }
Damien Millerb38eff82000-04-01 11:09:21 +10001171 if (newsock < 0) {
1172 error("accept: %.100s", strerror(errno));
1173 return;
1174 }
Damien Miller398e1cf2002-02-05 11:52:13 +11001175 set_nodelay(newsock);
Damien Millerd83ff352001-01-30 09:19:34 +11001176 remote_ipaddr = get_peer_ipaddr(newsock);
Damien Millerbd483e72000-04-30 10:00:53 +10001177 remote_port = get_peer_port(newsock);
Damien Millerb38eff82000-04-01 11:09:21 +10001178 snprintf(buf, sizeof buf, "X11 connection from %.200s port %d",
Damien Millerd83ff352001-01-30 09:19:34 +11001179 remote_ipaddr, remote_port);
Damien Millerbd483e72000-04-30 10:00:53 +10001180
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001181 nc = channel_new("accepted x11 socket",
Damien Millerbd483e72000-04-30 10:00:53 +10001182 SSH_CHANNEL_OPENING, newsock, newsock, -1,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001183 c->local_window_max, c->local_maxpacket, 0, buf, 1);
Damien Millerbd483e72000-04-30 10:00:53 +10001184 if (compat20) {
1185 packet_start(SSH2_MSG_CHANNEL_OPEN);
1186 packet_put_cstring("x11");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001187 packet_put_int(nc->self);
Damien Millere7378562001-12-21 14:58:35 +11001188 packet_put_int(nc->local_window_max);
1189 packet_put_int(nc->local_maxpacket);
Damien Millerd83ff352001-01-30 09:19:34 +11001190 /* originator ipaddr and port */
1191 packet_put_cstring(remote_ipaddr);
Damien Miller30c3d422000-05-09 11:02:59 +10001192 if (datafellows & SSH_BUG_X11FWD) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001193 debug2("ssh2 x11 bug compat mode");
Damien Miller30c3d422000-05-09 11:02:59 +10001194 } else {
1195 packet_put_int(remote_port);
1196 }
Damien Millerbd483e72000-04-30 10:00:53 +10001197 packet_send();
1198 } else {
1199 packet_start(SSH_SMSG_X11_OPEN);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001200 packet_put_int(nc->self);
Ben Lindstrome9c99912001-06-09 00:41:05 +00001201 if (packet_get_protocol_flags() &
1202 SSH_PROTOFLAG_HOST_IN_FWD_OPEN)
Ben Lindstrom664408d2001-06-09 01:42:01 +00001203 packet_put_cstring(buf);
Damien Millerbd483e72000-04-30 10:00:53 +10001204 packet_send();
1205 }
Damien Millerd83ff352001-01-30 09:19:34 +11001206 xfree(remote_ipaddr);
Damien Millerb38eff82000-04-01 11:09:21 +10001207 }
1208}
1209
Ben Lindstrombba81212001-06-25 05:01:22 +00001210static void
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001211port_open_helper(Channel *c, char *rtype)
1212{
1213 int direct;
1214 char buf[1024];
1215 char *remote_ipaddr = get_peer_ipaddr(c->sock);
Damien Miller677257f2005-06-17 12:55:03 +10001216 int remote_port = get_peer_port(c->sock);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001217
1218 direct = (strcmp(rtype, "direct-tcpip") == 0);
1219
1220 snprintf(buf, sizeof buf,
1221 "%s: listening port %d for %.100s port %d, "
1222 "connect from %.200s port %d",
1223 rtype, c->listening_port, c->path, c->host_port,
1224 remote_ipaddr, remote_port);
1225
1226 xfree(c->remote_name);
1227 c->remote_name = xstrdup(buf);
1228
1229 if (compat20) {
1230 packet_start(SSH2_MSG_CHANNEL_OPEN);
1231 packet_put_cstring(rtype);
1232 packet_put_int(c->self);
1233 packet_put_int(c->local_window_max);
1234 packet_put_int(c->local_maxpacket);
1235 if (direct) {
1236 /* target host, port */
1237 packet_put_cstring(c->path);
1238 packet_put_int(c->host_port);
1239 } else {
1240 /* listen address, port */
1241 packet_put_cstring(c->path);
1242 packet_put_int(c->listening_port);
1243 }
1244 /* originator host and port */
1245 packet_put_cstring(remote_ipaddr);
Damien Miller677257f2005-06-17 12:55:03 +10001246 packet_put_int((u_int)remote_port);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001247 packet_send();
1248 } else {
1249 packet_start(SSH_MSG_PORT_OPEN);
1250 packet_put_int(c->self);
1251 packet_put_cstring(c->path);
1252 packet_put_int(c->host_port);
Ben Lindstrome9c99912001-06-09 00:41:05 +00001253 if (packet_get_protocol_flags() &
1254 SSH_PROTOFLAG_HOST_IN_FWD_OPEN)
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001255 packet_put_cstring(c->remote_name);
1256 packet_send();
1257 }
1258 xfree(remote_ipaddr);
1259}
1260
Damien Miller5e7fd072005-11-05 14:53:39 +11001261static void
1262channel_set_reuseaddr(int fd)
1263{
1264 int on = 1;
1265
1266 /*
1267 * Set socket options.
1268 * Allow local port reuse in TIME_WAIT.
1269 */
1270 if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1)
1271 error("setsockopt SO_REUSEADDR fd %d: %s", fd, strerror(errno));
1272}
1273
Damien Millerb38eff82000-04-01 11:09:21 +10001274/*
1275 * This socket is listening for connections to a forwarded TCP/IP port.
1276 */
Ben Lindstrombba81212001-06-25 05:01:22 +00001277static void
Damien Millerb38eff82000-04-01 11:09:21 +10001278channel_post_port_listener(Channel *c, fd_set * readset, fd_set * writeset)
1279{
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001280 Channel *nc;
Damien Millerb38eff82000-04-01 11:09:21 +10001281 struct sockaddr addr;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001282 int newsock, nextstate;
Damien Millerb38eff82000-04-01 11:09:21 +10001283 socklen_t addrlen;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001284 char *rtype;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001285
Damien Millerb38eff82000-04-01 11:09:21 +10001286 if (FD_ISSET(c->sock, readset)) {
1287 debug("Connection to port %d forwarding "
1288 "to %.100s port %d requested.",
1289 c->listening_port, c->path, c->host_port);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001290
Damien Miller4623a752001-10-10 15:03:58 +10001291 if (c->type == SSH_CHANNEL_RPORT_LISTENER) {
1292 nextstate = SSH_CHANNEL_OPENING;
1293 rtype = "forwarded-tcpip";
1294 } else {
1295 if (c->host_port == 0) {
1296 nextstate = SSH_CHANNEL_DYNAMIC;
Damien Millerd3c04b92001-10-10 15:04:20 +10001297 rtype = "dynamic-tcpip";
Damien Miller4623a752001-10-10 15:03:58 +10001298 } else {
1299 nextstate = SSH_CHANNEL_OPENING;
1300 rtype = "direct-tcpip";
1301 }
1302 }
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001303
Damien Millerb38eff82000-04-01 11:09:21 +10001304 addrlen = sizeof(addr);
1305 newsock = accept(c->sock, &addr, &addrlen);
1306 if (newsock < 0) {
1307 error("accept: %.100s", strerror(errno));
1308 return;
1309 }
Ben Lindstrom1ebd7a52002-02-26 18:12:51 +00001310 set_nodelay(newsock);
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001311 nc = channel_new(rtype, nextstate, newsock, newsock, -1,
1312 c->local_window_max, c->local_maxpacket, 0, rtype, 1);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001313 nc->listening_port = c->listening_port;
1314 nc->host_port = c->host_port;
1315 strlcpy(nc->path, c->path, sizeof(nc->path));
1316
Damien Miller4623a752001-10-10 15:03:58 +10001317 if (nextstate == SSH_CHANNEL_DYNAMIC) {
1318 /*
1319 * do not call the channel_post handler until
1320 * this flag has been reset by a pre-handler.
1321 * otherwise the FD_ISSET calls might overflow
1322 */
1323 nc->delayed = 1;
1324 } else {
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001325 port_open_helper(nc, rtype);
Damien Miller4623a752001-10-10 15:03:58 +10001326 }
Damien Millerb38eff82000-04-01 11:09:21 +10001327 }
1328}
1329
1330/*
1331 * This is the authentication agent socket listening for connections from
1332 * clients.
1333 */
Ben Lindstrombba81212001-06-25 05:01:22 +00001334static void
Damien Millerb38eff82000-04-01 11:09:21 +10001335channel_post_auth_listener(Channel *c, fd_set * readset, fd_set * writeset)
1336{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001337 Channel *nc;
1338 int newsock;
Damien Millerb38eff82000-04-01 11:09:21 +10001339 struct sockaddr addr;
Damien Millerb38eff82000-04-01 11:09:21 +10001340 socklen_t addrlen;
1341
1342 if (FD_ISSET(c->sock, readset)) {
1343 addrlen = sizeof(addr);
1344 newsock = accept(c->sock, &addr, &addrlen);
1345 if (newsock < 0) {
1346 error("accept from auth socket: %.100s", strerror(errno));
1347 return;
1348 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001349 nc = channel_new("accepted auth socket",
Damien Miller0bc1bd82000-11-13 22:57:25 +11001350 SSH_CHANNEL_OPENING, newsock, newsock, -1,
1351 c->local_window_max, c->local_maxpacket,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001352 0, "accepted auth socket", 1);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001353 if (compat20) {
1354 packet_start(SSH2_MSG_CHANNEL_OPEN);
1355 packet_put_cstring("auth-agent@openssh.com");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001356 packet_put_int(nc->self);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001357 packet_put_int(c->local_window_max);
1358 packet_put_int(c->local_maxpacket);
1359 } else {
1360 packet_start(SSH_SMSG_AGENT_OPEN);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001361 packet_put_int(nc->self);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001362 }
Damien Millerb38eff82000-04-01 11:09:21 +10001363 packet_send();
1364 }
1365}
1366
Ben Lindstrombba81212001-06-25 05:01:22 +00001367static void
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001368channel_post_connecting(Channel *c, fd_set * readset, fd_set * writeset)
1369{
Ben Lindstrom69128662001-05-08 20:07:39 +00001370 int err = 0;
Ben Lindstrom11180952001-07-04 05:13:35 +00001371 socklen_t sz = sizeof(err);
Ben Lindstrom69128662001-05-08 20:07:39 +00001372
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001373 if (FD_ISSET(c->sock, writeset)) {
Ben Lindstrom733a2352002-03-05 01:31:28 +00001374 if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, &err, &sz) < 0) {
Ben Lindstrom69128662001-05-08 20:07:39 +00001375 err = errno;
1376 error("getsockopt SO_ERROR failed");
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001377 }
Ben Lindstrom69128662001-05-08 20:07:39 +00001378 if (err == 0) {
1379 debug("channel %d: connected", c->self);
1380 c->type = SSH_CHANNEL_OPEN;
1381 if (compat20) {
1382 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1383 packet_put_int(c->remote_id);
1384 packet_put_int(c->self);
1385 packet_put_int(c->local_window);
1386 packet_put_int(c->local_maxpacket);
1387 } else {
1388 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1389 packet_put_int(c->remote_id);
1390 packet_put_int(c->self);
1391 }
1392 } else {
1393 debug("channel %d: not connected: %s",
1394 c->self, strerror(err));
1395 if (compat20) {
1396 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1397 packet_put_int(c->remote_id);
1398 packet_put_int(SSH2_OPEN_CONNECT_FAILED);
1399 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1400 packet_put_cstring(strerror(err));
1401 packet_put_cstring("");
1402 }
1403 } else {
1404 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1405 packet_put_int(c->remote_id);
1406 }
1407 chan_mark_dead(c);
1408 }
1409 packet_send();
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001410 }
1411}
1412
Ben Lindstrombba81212001-06-25 05:01:22 +00001413static int
Damien Millerb38eff82000-04-01 11:09:21 +10001414channel_handle_rfd(Channel *c, fd_set * readset, fd_set * writeset)
1415{
Darren Tucker11327cc2005-03-14 23:22:25 +11001416 char buf[CHAN_RBUF];
Damien Millerb38eff82000-04-01 11:09:21 +10001417 int len;
1418
Ben Lindstromc0dee1a2001-06-05 20:52:50 +00001419 if (c->rfd != -1 &&
Damien Millerb38eff82000-04-01 11:09:21 +10001420 FD_ISSET(c->rfd, readset)) {
1421 len = read(c->rfd, buf, sizeof(buf));
Damien Miller6f83b8e2000-05-02 09:23:45 +10001422 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1423 return 1;
Damien Millerb38eff82000-04-01 11:09:21 +10001424 if (len <= 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001425 debug2("channel %d: read<=0 rfd %d len %d",
Damien Millerb38eff82000-04-01 11:09:21 +10001426 c->self, c->rfd, len);
Ben Lindstromb3921512001-04-11 15:57:50 +00001427 if (c->type != SSH_CHANNEL_OPEN) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001428 debug2("channel %d: not open", c->self);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001429 chan_mark_dead(c);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001430 return -1;
Ben Lindstromb3921512001-04-11 15:57:50 +00001431 } else if (compat13) {
Damien Miller76765c02002-01-22 23:21:15 +11001432 buffer_clear(&c->output);
Damien Millerb38eff82000-04-01 11:09:21 +10001433 c->type = SSH_CHANNEL_INPUT_DRAINING;
Damien Millerfbdeece2003-09-02 22:52:31 +10001434 debug2("channel %d: input draining.", c->self);
Damien Millerb38eff82000-04-01 11:09:21 +10001435 } else {
1436 chan_read_failed(c);
1437 }
1438 return -1;
1439 }
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00001440 if (c->input_filter != NULL) {
Damien Millerad833b32000-08-23 10:46:23 +10001441 if (c->input_filter(c, buf, len) == -1) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001442 debug2("channel %d: filter stops", c->self);
Damien Millerad833b32000-08-23 10:46:23 +10001443 chan_read_failed(c);
1444 }
Damien Millerd27b9472005-12-13 19:29:02 +11001445 } else if (c->datagram) {
1446 buffer_put_string(&c->input, buf, len);
Damien Millerad833b32000-08-23 10:46:23 +10001447 } else {
1448 buffer_append(&c->input, buf, len);
1449 }
Damien Millerb38eff82000-04-01 11:09:21 +10001450 }
1451 return 1;
1452}
Ben Lindstrombba81212001-06-25 05:01:22 +00001453static int
Damien Millerb38eff82000-04-01 11:09:21 +10001454channel_handle_wfd(Channel *c, fd_set * readset, fd_set * writeset)
1455{
Ben Lindstrome229b252001-03-05 06:28:06 +00001456 struct termios tio;
Ben Lindstrom6d218f42001-09-18 05:53:12 +00001457 u_char *data;
1458 u_int dlen;
Damien Millerb38eff82000-04-01 11:09:21 +10001459 int len;
1460
1461 /* Send buffered output data to the socket. */
Ben Lindstromc0dee1a2001-06-05 20:52:50 +00001462 if (c->wfd != -1 &&
Damien Millerb38eff82000-04-01 11:09:21 +10001463 FD_ISSET(c->wfd, writeset) &&
1464 buffer_len(&c->output) > 0) {
Damien Millerd27b9472005-12-13 19:29:02 +11001465 if (c->datagram) {
1466 data = buffer_get_string(&c->output, &dlen);
1467 /* ignore truncated writes, datagrams might get lost */
1468 c->local_consumed += dlen + 4;
1469 len = write(c->wfd, data, dlen);
1470 xfree(data);
1471 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1472 return 1;
1473 if (len <= 0) {
1474 if (c->type != SSH_CHANNEL_OPEN)
1475 chan_mark_dead(c);
1476 else
1477 chan_write_failed(c);
1478 return -1;
1479 }
1480 return 1;
1481 }
Ben Lindstrom6d218f42001-09-18 05:53:12 +00001482 data = buffer_ptr(&c->output);
1483 dlen = buffer_len(&c->output);
Ben Lindstrom92ea0ea2002-07-04 18:11:09 +00001484#ifdef _AIX
Damien Millera8e06ce2003-11-21 23:48:55 +11001485 /* XXX: Later AIX versions can't push as much data to tty */
Darren Tucker240fdfa2003-11-22 14:10:02 +11001486 if (compat20 && c->wfd_isatty)
1487 dlen = MIN(dlen, 8*1024);
Ben Lindstrom92ea0ea2002-07-04 18:11:09 +00001488#endif
Ben Lindstrombeb5f332002-07-22 15:28:53 +00001489 len = write(c->wfd, data, dlen);
Damien Miller6f83b8e2000-05-02 09:23:45 +10001490 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1491 return 1;
Damien Millerb38eff82000-04-01 11:09:21 +10001492 if (len <= 0) {
Ben Lindstromb3921512001-04-11 15:57:50 +00001493 if (c->type != SSH_CHANNEL_OPEN) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001494 debug2("channel %d: not open", c->self);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001495 chan_mark_dead(c);
Ben Lindstromb3921512001-04-11 15:57:50 +00001496 return -1;
1497 } else if (compat13) {
Damien Miller76765c02002-01-22 23:21:15 +11001498 buffer_clear(&c->output);
Damien Millerfbdeece2003-09-02 22:52:31 +10001499 debug2("channel %d: input draining.", c->self);
Damien Millerb38eff82000-04-01 11:09:21 +10001500 c->type = SSH_CHANNEL_INPUT_DRAINING;
1501 } else {
1502 chan_write_failed(c);
1503 }
1504 return -1;
1505 }
Ben Lindstrom6d218f42001-09-18 05:53:12 +00001506 if (compat20 && c->isatty && dlen >= 1 && data[0] != '\r') {
Damien Miller79438cc2001-02-16 12:34:57 +11001507 if (tcgetattr(c->wfd, &tio) == 0 &&
1508 !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) {
1509 /*
1510 * Simulate echo to reduce the impact of
Ben Lindstromb40204b2001-03-05 06:29:44 +00001511 * traffic analysis. We need to match the
Ben Lindstrome229b252001-03-05 06:28:06 +00001512 * size of a SSH2_MSG_CHANNEL_DATA message
1513 * (4 byte channel id + data)
Damien Miller79438cc2001-02-16 12:34:57 +11001514 */
Ben Lindstrome229b252001-03-05 06:28:06 +00001515 packet_send_ignore(4 + len);
Damien Miller79438cc2001-02-16 12:34:57 +11001516 packet_send();
Damien Miller79438cc2001-02-16 12:34:57 +11001517 }
1518 }
Damien Millerb38eff82000-04-01 11:09:21 +10001519 buffer_consume(&c->output, len);
Damien Miller33b13562000-04-04 14:38:59 +10001520 if (compat20 && len > 0) {
1521 c->local_consumed += len;
1522 }
1523 }
1524 return 1;
1525}
Ben Lindstrombba81212001-06-25 05:01:22 +00001526static int
Damien Miller33b13562000-04-04 14:38:59 +10001527channel_handle_efd(Channel *c, fd_set * readset, fd_set * writeset)
1528{
Darren Tucker11327cc2005-03-14 23:22:25 +11001529 char buf[CHAN_RBUF];
Damien Miller33b13562000-04-04 14:38:59 +10001530 int len;
1531
Damien Miller1383bd82000-04-06 12:32:37 +10001532/** XXX handle drain efd, too */
Damien Miller33b13562000-04-04 14:38:59 +10001533 if (c->efd != -1) {
1534 if (c->extended_usage == CHAN_EXTENDED_WRITE &&
1535 FD_ISSET(c->efd, writeset) &&
1536 buffer_len(&c->extended) > 0) {
1537 len = write(c->efd, buffer_ptr(&c->extended),
1538 buffer_len(&c->extended));
Damien Millerd3444942000-09-30 14:20:03 +11001539 debug2("channel %d: written %d to efd %d",
Damien Miller33b13562000-04-04 14:38:59 +10001540 c->self, len, c->efd);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001541 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1542 return 1;
1543 if (len <= 0) {
1544 debug2("channel %d: closing write-efd %d",
1545 c->self, c->efd);
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001546 channel_close_fd(&c->efd);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001547 } else {
Damien Miller33b13562000-04-04 14:38:59 +10001548 buffer_consume(&c->extended, len);
1549 c->local_consumed += len;
1550 }
1551 } else if (c->extended_usage == CHAN_EXTENDED_READ &&
1552 FD_ISSET(c->efd, readset)) {
1553 len = read(c->efd, buf, sizeof(buf));
Damien Millerd3444942000-09-30 14:20:03 +11001554 debug2("channel %d: read %d from efd %d",
Damien Miller9f0f5c62001-12-21 14:45:46 +11001555 c->self, len, c->efd);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001556 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1557 return 1;
1558 if (len <= 0) {
1559 debug2("channel %d: closing read-efd %d",
Damien Miller1383bd82000-04-06 12:32:37 +10001560 c->self, c->efd);
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001561 channel_close_fd(&c->efd);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001562 } else {
Damien Miller33b13562000-04-04 14:38:59 +10001563 buffer_append(&c->extended, buf, len);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001564 }
Damien Miller33b13562000-04-04 14:38:59 +10001565 }
1566 }
1567 return 1;
1568}
Ben Lindstrombba81212001-06-25 05:01:22 +00001569static int
Damien Miller0e220db2004-06-15 10:34:08 +10001570channel_handle_ctl(Channel *c, fd_set * readset, fd_set * writeset)
1571{
1572 char buf[16];
1573 int len;
1574
1575 /* Monitor control fd to detect if the slave client exits */
1576 if (c->ctl_fd != -1 && FD_ISSET(c->ctl_fd, readset)) {
1577 len = read(c->ctl_fd, buf, sizeof(buf));
1578 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1579 return 1;
1580 if (len <= 0) {
1581 debug2("channel %d: ctl read<=0", c->self);
1582 if (c->type != SSH_CHANNEL_OPEN) {
1583 debug2("channel %d: not open", c->self);
1584 chan_mark_dead(c);
1585 return -1;
1586 } else {
1587 chan_read_failed(c);
1588 chan_write_failed(c);
1589 }
1590 return -1;
1591 } else
1592 fatal("%s: unexpected data on ctl fd", __func__);
1593 }
1594 return 1;
1595}
1596static int
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001597channel_check_window(Channel *c)
Damien Miller33b13562000-04-04 14:38:59 +10001598{
Ben Lindstromb3921512001-04-11 15:57:50 +00001599 if (c->type == SSH_CHANNEL_OPEN &&
1600 !(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) &&
Damien Miller33b13562000-04-04 14:38:59 +10001601 c->local_window < c->local_window_max/2 &&
1602 c->local_consumed > 0) {
1603 packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
1604 packet_put_int(c->remote_id);
1605 packet_put_int(c->local_consumed);
1606 packet_send();
Damien Millerd3444942000-09-30 14:20:03 +11001607 debug2("channel %d: window %d sent adjust %d",
Damien Miller33b13562000-04-04 14:38:59 +10001608 c->self, c->local_window,
1609 c->local_consumed);
1610 c->local_window += c->local_consumed;
1611 c->local_consumed = 0;
Damien Millerb38eff82000-04-01 11:09:21 +10001612 }
1613 return 1;
1614}
1615
Ben Lindstrombba81212001-06-25 05:01:22 +00001616static void
Damien Millerde6987c2002-01-22 23:20:40 +11001617channel_post_open(Channel *c, fd_set * readset, fd_set * writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001618{
Damien Miller4623a752001-10-10 15:03:58 +10001619 if (c->delayed)
1620 return;
Damien Millerb38eff82000-04-01 11:09:21 +10001621 channel_handle_rfd(c, readset, writeset);
1622 channel_handle_wfd(c, readset, writeset);
Damien Millerde6987c2002-01-22 23:20:40 +11001623 if (!compat20)
Damien Miller4623a752001-10-10 15:03:58 +10001624 return;
Damien Miller33b13562000-04-04 14:38:59 +10001625 channel_handle_efd(c, readset, writeset);
Damien Miller0e220db2004-06-15 10:34:08 +10001626 channel_handle_ctl(c, readset, writeset);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001627 channel_check_window(c);
Damien Miller33b13562000-04-04 14:38:59 +10001628}
1629
Ben Lindstrombba81212001-06-25 05:01:22 +00001630static void
Damien Millerb38eff82000-04-01 11:09:21 +10001631channel_post_output_drain_13(Channel *c, fd_set * readset, fd_set * writeset)
1632{
1633 int len;
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +00001634
Damien Millerb38eff82000-04-01 11:09:21 +10001635 /* Send buffered output data to the socket. */
1636 if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) {
1637 len = write(c->sock, buffer_ptr(&c->output),
1638 buffer_len(&c->output));
1639 if (len <= 0)
Damien Miller76765c02002-01-22 23:21:15 +11001640 buffer_clear(&c->output);
Damien Millerb38eff82000-04-01 11:09:21 +10001641 else
1642 buffer_consume(&c->output, len);
1643 }
1644}
1645
Ben Lindstrombba81212001-06-25 05:01:22 +00001646static void
Damien Miller33b13562000-04-04 14:38:59 +10001647channel_handler_init_20(void)
1648{
Damien Millerde6987c2002-01-22 23:20:40 +11001649 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open;
Damien Millerbd483e72000-04-30 10:00:53 +10001650 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open;
Damien Miller33b13562000-04-04 14:38:59 +10001651 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001652 channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener;
Damien Millerbd483e72000-04-30 10:00:53 +10001653 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001654 channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001655 channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001656 channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
Damien Miller33b13562000-04-04 14:38:59 +10001657
Damien Millerde6987c2002-01-22 23:20:40 +11001658 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open;
Damien Miller33b13562000-04-04 14:38:59 +10001659 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001660 channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener;
Damien Millerbd483e72000-04-30 10:00:53 +10001661 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001662 channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001663 channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
Damien Millerde6987c2002-01-22 23:20:40 +11001664 channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open;
Damien Miller33b13562000-04-04 14:38:59 +10001665}
1666
Ben Lindstrombba81212001-06-25 05:01:22 +00001667static void
Damien Millerb38eff82000-04-01 11:09:21 +10001668channel_handler_init_13(void)
1669{
1670 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13;
1671 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_13;
1672 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
1673 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
1674 channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
1675 channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining;
1676 channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001677 channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001678 channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
Damien Millerb38eff82000-04-01 11:09:21 +10001679
Damien Millerde6987c2002-01-22 23:20:40 +11001680 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open;
Damien Millerb38eff82000-04-01 11:09:21 +10001681 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
1682 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
1683 channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
1684 channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001685 channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
Damien Millerde6987c2002-01-22 23:20:40 +11001686 channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open;
Damien Millerb38eff82000-04-01 11:09:21 +10001687}
1688
Ben Lindstrombba81212001-06-25 05:01:22 +00001689static void
Damien Millerb38eff82000-04-01 11:09:21 +10001690channel_handler_init_15(void)
1691{
Damien Millerde6987c2002-01-22 23:20:40 +11001692 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open;
Damien Millerbd483e72000-04-30 10:00:53 +10001693 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open;
Damien Millerb38eff82000-04-01 11:09:21 +10001694 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
1695 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
1696 channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001697 channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001698 channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
Damien Millerb38eff82000-04-01 11:09:21 +10001699
1700 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
1701 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
1702 channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
Damien Millerde6987c2002-01-22 23:20:40 +11001703 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001704 channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
Damien Millerde6987c2002-01-22 23:20:40 +11001705 channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open;
Damien Millerb38eff82000-04-01 11:09:21 +10001706}
1707
Ben Lindstrombba81212001-06-25 05:01:22 +00001708static void
Damien Millerb38eff82000-04-01 11:09:21 +10001709channel_handler_init(void)
1710{
1711 int i;
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +00001712
Damien Miller9f0f5c62001-12-21 14:45:46 +11001713 for (i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) {
Damien Millerb38eff82000-04-01 11:09:21 +10001714 channel_pre[i] = NULL;
1715 channel_post[i] = NULL;
1716 }
Damien Miller33b13562000-04-04 14:38:59 +10001717 if (compat20)
1718 channel_handler_init_20();
1719 else if (compat13)
Damien Millerb38eff82000-04-01 11:09:21 +10001720 channel_handler_init_13();
1721 else
1722 channel_handler_init_15();
1723}
1724
Damien Miller3ec27592001-10-12 11:35:04 +10001725/* gc dead channels */
1726static void
1727channel_garbage_collect(Channel *c)
1728{
1729 if (c == NULL)
1730 return;
1731 if (c->detach_user != NULL) {
Damien Miller39eda6e2005-11-05 14:52:50 +11001732 if (!chan_is_dead(c, c->detach_close))
Damien Miller3ec27592001-10-12 11:35:04 +10001733 return;
Damien Millerfbdeece2003-09-02 22:52:31 +10001734 debug2("channel %d: gc: notify user", c->self);
Damien Miller3ec27592001-10-12 11:35:04 +10001735 c->detach_user(c->self, NULL);
1736 /* if we still have a callback */
1737 if (c->detach_user != NULL)
1738 return;
Damien Millerfbdeece2003-09-02 22:52:31 +10001739 debug2("channel %d: gc: user detached", c->self);
Damien Miller3ec27592001-10-12 11:35:04 +10001740 }
1741 if (!chan_is_dead(c, 1))
1742 return;
Damien Millerfbdeece2003-09-02 22:52:31 +10001743 debug2("channel %d: garbage collecting", c->self);
Damien Miller3ec27592001-10-12 11:35:04 +10001744 channel_free(c);
1745}
1746
Ben Lindstrombba81212001-06-25 05:01:22 +00001747static void
Damien Millerb38eff82000-04-01 11:09:21 +10001748channel_handler(chan_fn *ftab[], fd_set * readset, fd_set * writeset)
1749{
1750 static int did_init = 0;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10001751 u_int i;
Damien Millerb38eff82000-04-01 11:09:21 +10001752 Channel *c;
1753
1754 if (!did_init) {
1755 channel_handler_init();
1756 did_init = 1;
1757 }
1758 for (i = 0; i < channels_alloc; i++) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001759 c = channels[i];
1760 if (c == NULL)
Damien Millerb38eff82000-04-01 11:09:21 +10001761 continue;
Ben Lindstromc0dee1a2001-06-05 20:52:50 +00001762 if (ftab[c->type] != NULL)
1763 (*ftab[c->type])(c, readset, writeset);
Damien Miller3ec27592001-10-12 11:35:04 +10001764 channel_garbage_collect(c);
Damien Millerb38eff82000-04-01 11:09:21 +10001765 }
1766}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001767
Ben Lindstrome9c99912001-06-09 00:41:05 +00001768/*
1769 * Allocate/update select bitmasks and add any bits relevant to channels in
1770 * select bitmasks.
1771 */
Damien Miller4af51302000-04-16 11:18:38 +10001772void
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001773channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp,
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10001774 u_int *nallocp, int rekeying)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001775{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10001776 u_int n, sz;
Damien Miller5e953212001-01-30 09:14:00 +11001777
1778 n = MAX(*maxfdp, channel_max_fd);
1779
1780 sz = howmany(n+1, NFDBITS) * sizeof(fd_mask);
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001781 /* perhaps check sz < nalloc/2 and shrink? */
1782 if (*readsetp == NULL || sz > *nallocp) {
1783 *readsetp = xrealloc(*readsetp, sz);
1784 *writesetp = xrealloc(*writesetp, sz);
1785 *nallocp = sz;
Damien Miller5e953212001-01-30 09:14:00 +11001786 }
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001787 *maxfdp = n;
Damien Miller5e953212001-01-30 09:14:00 +11001788 memset(*readsetp, 0, sz);
1789 memset(*writesetp, 0, sz);
1790
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001791 if (!rekeying)
1792 channel_handler(channel_pre, *readsetp, *writesetp);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001793}
1794
Ben Lindstrome9c99912001-06-09 00:41:05 +00001795/*
1796 * After select, perform any appropriate operations for channels which have
1797 * events pending.
1798 */
Damien Miller4af51302000-04-16 11:18:38 +10001799void
Damien Miller95def091999-11-25 00:26:21 +11001800channel_after_select(fd_set * readset, fd_set * writeset)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001801{
Damien Millerb38eff82000-04-01 11:09:21 +10001802 channel_handler(channel_post, readset, writeset);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001803}
1804
Ben Lindstrome9c99912001-06-09 00:41:05 +00001805
Damien Miller5e953212001-01-30 09:14:00 +11001806/* If there is data to send to the connection, enqueue some of it now. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001807
Damien Miller4af51302000-04-16 11:18:38 +10001808void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00001809channel_output_poll(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001810{
Damien Millerb38eff82000-04-01 11:09:21 +10001811 Channel *c;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10001812 u_int i, len;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001813
Damien Miller95def091999-11-25 00:26:21 +11001814 for (i = 0; i < channels_alloc; i++) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001815 c = channels[i];
1816 if (c == NULL)
1817 continue;
Damien Miller34132e52000-01-14 15:45:46 +11001818
Ben Lindstrome9c99912001-06-09 00:41:05 +00001819 /*
1820 * We are only interested in channels that can have buffered
1821 * incoming data.
1822 */
Damien Miller34132e52000-01-14 15:45:46 +11001823 if (compat13) {
Damien Millerb38eff82000-04-01 11:09:21 +10001824 if (c->type != SSH_CHANNEL_OPEN &&
1825 c->type != SSH_CHANNEL_INPUT_DRAINING)
Damien Miller34132e52000-01-14 15:45:46 +11001826 continue;
1827 } else {
Damien Millerb38eff82000-04-01 11:09:21 +10001828 if (c->type != SSH_CHANNEL_OPEN)
Damien Miller34132e52000-01-14 15:45:46 +11001829 continue;
Damien Miller34132e52000-01-14 15:45:46 +11001830 }
Damien Millerefb4afe2000-04-12 18:45:05 +10001831 if (compat20 &&
1832 (c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) {
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001833 /* XXX is this true? */
Damien Miller3ec27592001-10-12 11:35:04 +10001834 debug3("channel %d: will not send data after close", c->self);
Damien Miller33b13562000-04-04 14:38:59 +10001835 continue;
1836 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001837
Damien Miller95def091999-11-25 00:26:21 +11001838 /* Get the amount of buffered data for this channel. */
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001839 if ((c->istate == CHAN_INPUT_OPEN ||
1840 c->istate == CHAN_INPUT_WAIT_DRAIN) &&
1841 (len = buffer_len(&c->input)) > 0) {
Damien Millerd27b9472005-12-13 19:29:02 +11001842 if (c->datagram) {
1843 if (len > 0) {
1844 u_char *data;
1845 u_int dlen;
1846
1847 data = buffer_get_string(&c->input,
1848 &dlen);
1849 packet_start(SSH2_MSG_CHANNEL_DATA);
1850 packet_put_int(c->remote_id);
1851 packet_put_string(data, dlen);
1852 packet_send();
1853 c->remote_window -= dlen + 4;
1854 xfree(data);
1855 }
1856 continue;
1857 }
Ben Lindstrome9c99912001-06-09 00:41:05 +00001858 /*
1859 * Send some data for the other side over the secure
1860 * connection.
1861 */
Damien Miller33b13562000-04-04 14:38:59 +10001862 if (compat20) {
1863 if (len > c->remote_window)
1864 len = c->remote_window;
1865 if (len > c->remote_maxpacket)
1866 len = c->remote_maxpacket;
Damien Miller95def091999-11-25 00:26:21 +11001867 } else {
Damien Miller33b13562000-04-04 14:38:59 +10001868 if (packet_is_interactive()) {
1869 if (len > 1024)
1870 len = 512;
1871 } else {
1872 /* Keep the packets at reasonable size. */
1873 if (len > packet_get_maxsize()/2)
1874 len = packet_get_maxsize()/2;
1875 }
Damien Miller95def091999-11-25 00:26:21 +11001876 }
Damien Millerb38eff82000-04-01 11:09:21 +10001877 if (len > 0) {
Damien Miller33b13562000-04-04 14:38:59 +10001878 packet_start(compat20 ?
1879 SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA);
Damien Millerb38eff82000-04-01 11:09:21 +10001880 packet_put_int(c->remote_id);
1881 packet_put_string(buffer_ptr(&c->input), len);
1882 packet_send();
1883 buffer_consume(&c->input, len);
1884 c->remote_window -= len;
Damien Millerb38eff82000-04-01 11:09:21 +10001885 }
1886 } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) {
Damien Miller95def091999-11-25 00:26:21 +11001887 if (compat13)
1888 fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3");
Damien Miller5428f641999-11-25 11:54:57 +11001889 /*
1890 * input-buffer is empty and read-socket shutdown:
Ben Lindstromcf159442002-03-26 03:26:24 +00001891 * tell peer, that we will not send more data: send IEOF.
1892 * hack for extended data: delay EOF if EFD still in use.
Damien Miller5428f641999-11-25 11:54:57 +11001893 */
Ben Lindstromcf159442002-03-26 03:26:24 +00001894 if (CHANNEL_EFD_INPUT_ACTIVE(c))
Damien Miller0dc1bef2005-07-17 17:22:45 +10001895 debug2("channel %d: ibuf_empty delayed efd %d/(%d)",
1896 c->self, c->efd, buffer_len(&c->extended));
Ben Lindstromcf159442002-03-26 03:26:24 +00001897 else
1898 chan_ibuf_empty(c);
Damien Miller95def091999-11-25 00:26:21 +11001899 }
Damien Miller33b13562000-04-04 14:38:59 +10001900 /* Send extended data, i.e. stderr */
1901 if (compat20 &&
Ben Lindstromcf159442002-03-26 03:26:24 +00001902 !(c->flags & CHAN_EOF_SENT) &&
Damien Miller33b13562000-04-04 14:38:59 +10001903 c->remote_window > 0 &&
1904 (len = buffer_len(&c->extended)) > 0 &&
1905 c->extended_usage == CHAN_EXTENDED_READ) {
Ben Lindstrom4fed2be2002-06-25 23:17:36 +00001906 debug2("channel %d: rwin %u elen %u euse %d",
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001907 c->self, c->remote_window, buffer_len(&c->extended),
1908 c->extended_usage);
Damien Miller33b13562000-04-04 14:38:59 +10001909 if (len > c->remote_window)
1910 len = c->remote_window;
1911 if (len > c->remote_maxpacket)
1912 len = c->remote_maxpacket;
1913 packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA);
1914 packet_put_int(c->remote_id);
1915 packet_put_int(SSH2_EXTENDED_DATA_STDERR);
1916 packet_put_string(buffer_ptr(&c->extended), len);
1917 packet_send();
1918 buffer_consume(&c->extended, len);
1919 c->remote_window -= len;
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001920 debug2("channel %d: sent ext data %d", c->self, len);
Damien Miller33b13562000-04-04 14:38:59 +10001921 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001922 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001923}
1924
Ben Lindstrome9c99912001-06-09 00:41:05 +00001925
1926/* -- protocol input */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001927
Damien Miller4af51302000-04-16 11:18:38 +10001928void
Damien Miller630d6f42002-01-22 23:17:30 +11001929channel_input_data(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001930{
Damien Miller34132e52000-01-14 15:45:46 +11001931 int id;
Damien Miller95def091999-11-25 00:26:21 +11001932 char *data;
Ben Lindstrom46c16222000-12-22 01:43:59 +00001933 u_int data_len;
Damien Millerb38eff82000-04-01 11:09:21 +10001934 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001935
Damien Miller95def091999-11-25 00:26:21 +11001936 /* Get the channel number and verify it. */
Damien Miller34132e52000-01-14 15:45:46 +11001937 id = packet_get_int();
Damien Millerb38eff82000-04-01 11:09:21 +10001938 c = channel_lookup(id);
1939 if (c == NULL)
Damien Miller34132e52000-01-14 15:45:46 +11001940 packet_disconnect("Received data for nonexistent channel %d.", id);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001941
Damien Miller95def091999-11-25 00:26:21 +11001942 /* Ignore any data for non-open channels (might happen on close) */
Damien Millerb38eff82000-04-01 11:09:21 +10001943 if (c->type != SSH_CHANNEL_OPEN &&
1944 c->type != SSH_CHANNEL_X11_OPEN)
Damien Miller34132e52000-01-14 15:45:46 +11001945 return;
1946
Damien Miller95def091999-11-25 00:26:21 +11001947 /* Get the data. */
1948 data = packet_get_string(&data_len);
Damien Millerb38eff82000-04-01 11:09:21 +10001949
Damien Millera04ad492004-01-21 11:02:09 +11001950 /*
1951 * Ignore data for protocol > 1.3 if output end is no longer open.
1952 * For protocol 2 the sending side is reducing its window as it sends
1953 * data, so we must 'fake' consumption of the data in order to ensure
1954 * that window updates are sent back. Otherwise the connection might
1955 * deadlock.
1956 */
1957 if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN) {
1958 if (compat20) {
1959 c->local_window -= data_len;
1960 c->local_consumed += data_len;
1961 }
1962 xfree(data);
1963 return;
1964 }
1965
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00001966 if (compat20) {
Damien Miller33b13562000-04-04 14:38:59 +10001967 if (data_len > c->local_maxpacket) {
Damien Miller996acd22003-04-09 20:59:48 +10001968 logit("channel %d: rcvd big packet %d, maxpack %d",
Damien Miller33b13562000-04-04 14:38:59 +10001969 c->self, data_len, c->local_maxpacket);
1970 }
1971 if (data_len > c->local_window) {
Damien Miller996acd22003-04-09 20:59:48 +10001972 logit("channel %d: rcvd too much data %d, win %d",
Damien Miller33b13562000-04-04 14:38:59 +10001973 c->self, data_len, c->local_window);
1974 xfree(data);
1975 return;
1976 }
1977 c->local_window -= data_len;
Damien Miller33b13562000-04-04 14:38:59 +10001978 }
Damien Miller48b03fc2002-01-22 23:11:40 +11001979 packet_check_eom();
Damien Millerd27b9472005-12-13 19:29:02 +11001980 if (c->datagram)
1981 buffer_put_string(&c->output, data, data_len);
1982 else
1983 buffer_append(&c->output, data, data_len);
Damien Miller95def091999-11-25 00:26:21 +11001984 xfree(data);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001985}
Ben Lindstrome9c99912001-06-09 00:41:05 +00001986
Damien Miller4af51302000-04-16 11:18:38 +10001987void
Damien Miller630d6f42002-01-22 23:17:30 +11001988channel_input_extended_data(int type, u_int32_t seq, void *ctxt)
Damien Miller33b13562000-04-04 14:38:59 +10001989{
1990 int id;
Damien Miller33b13562000-04-04 14:38:59 +10001991 char *data;
Ben Lindstromdaa21792002-06-25 23:15:30 +00001992 u_int data_len, tcode;
Damien Miller33b13562000-04-04 14:38:59 +10001993 Channel *c;
1994
1995 /* Get the channel number and verify it. */
1996 id = packet_get_int();
1997 c = channel_lookup(id);
1998
1999 if (c == NULL)
2000 packet_disconnect("Received extended_data for bad channel %d.", id);
2001 if (c->type != SSH_CHANNEL_OPEN) {
Damien Miller996acd22003-04-09 20:59:48 +10002002 logit("channel %d: ext data for non open", id);
Damien Miller33b13562000-04-04 14:38:59 +10002003 return;
2004 }
Ben Lindstromcf159442002-03-26 03:26:24 +00002005 if (c->flags & CHAN_EOF_RCVD) {
2006 if (datafellows & SSH_BUG_EXTEOF)
2007 debug("channel %d: accepting ext data after eof", id);
2008 else
2009 packet_disconnect("Received extended_data after EOF "
2010 "on channel %d.", id);
2011 }
Damien Miller33b13562000-04-04 14:38:59 +10002012 tcode = packet_get_int();
2013 if (c->efd == -1 ||
2014 c->extended_usage != CHAN_EXTENDED_WRITE ||
2015 tcode != SSH2_EXTENDED_DATA_STDERR) {
Damien Miller996acd22003-04-09 20:59:48 +10002016 logit("channel %d: bad ext data", c->self);
Damien Miller33b13562000-04-04 14:38:59 +10002017 return;
2018 }
2019 data = packet_get_string(&data_len);
Damien Miller48b03fc2002-01-22 23:11:40 +11002020 packet_check_eom();
Damien Miller33b13562000-04-04 14:38:59 +10002021 if (data_len > c->local_window) {
Damien Miller996acd22003-04-09 20:59:48 +10002022 logit("channel %d: rcvd too much extended_data %d, win %d",
Damien Miller33b13562000-04-04 14:38:59 +10002023 c->self, data_len, c->local_window);
2024 xfree(data);
2025 return;
2026 }
Damien Millerd3444942000-09-30 14:20:03 +11002027 debug2("channel %d: rcvd ext data %d", c->self, data_len);
Damien Miller33b13562000-04-04 14:38:59 +10002028 c->local_window -= data_len;
2029 buffer_append(&c->extended, data, data_len);
2030 xfree(data);
2031}
2032
Damien Miller4af51302000-04-16 11:18:38 +10002033void
Damien Miller630d6f42002-01-22 23:17:30 +11002034channel_input_ieof(int type, u_int32_t seq, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10002035{
2036 int id;
2037 Channel *c;
2038
Damien Millerb38eff82000-04-01 11:09:21 +10002039 id = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11002040 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10002041 c = channel_lookup(id);
2042 if (c == NULL)
2043 packet_disconnect("Received ieof for nonexistent channel %d.", id);
2044 chan_rcvd_ieof(c);
Ben Lindstrom944c4f02001-09-18 05:51:13 +00002045
2046 /* XXX force input close */
Damien Millera90fc082002-01-22 23:19:38 +11002047 if (c->force_drain && c->istate == CHAN_INPUT_OPEN) {
Ben Lindstrom944c4f02001-09-18 05:51:13 +00002048 debug("channel %d: FORCE input drain", c->self);
2049 c->istate = CHAN_INPUT_WAIT_DRAIN;
Damien Miller73f10742002-01-22 23:34:52 +11002050 if (buffer_len(&c->input) == 0)
2051 chan_ibuf_empty(c);
Ben Lindstrom944c4f02001-09-18 05:51:13 +00002052 }
2053
Damien Millerb38eff82000-04-01 11:09:21 +10002054}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002055
Damien Miller4af51302000-04-16 11:18:38 +10002056void
Damien Miller630d6f42002-01-22 23:17:30 +11002057channel_input_close(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002058{
Damien Millerb38eff82000-04-01 11:09:21 +10002059 int id;
2060 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002061
Damien Millerb38eff82000-04-01 11:09:21 +10002062 id = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11002063 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10002064 c = channel_lookup(id);
2065 if (c == NULL)
2066 packet_disconnect("Received close for nonexistent channel %d.", id);
Damien Miller5428f641999-11-25 11:54:57 +11002067
2068 /*
2069 * Send a confirmation that we have closed the channel and no more
2070 * data is coming for it.
2071 */
Damien Miller95def091999-11-25 00:26:21 +11002072 packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION);
Damien Millerb38eff82000-04-01 11:09:21 +10002073 packet_put_int(c->remote_id);
Damien Miller95def091999-11-25 00:26:21 +11002074 packet_send();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002075
Damien Miller5428f641999-11-25 11:54:57 +11002076 /*
2077 * If the channel is in closed state, we have sent a close request,
2078 * and the other side will eventually respond with a confirmation.
2079 * Thus, we cannot free the channel here, because then there would be
2080 * no-one to receive the confirmation. The channel gets freed when
2081 * the confirmation arrives.
2082 */
Damien Millerb38eff82000-04-01 11:09:21 +10002083 if (c->type != SSH_CHANNEL_CLOSED) {
Damien Miller5428f641999-11-25 11:54:57 +11002084 /*
2085 * Not a closed channel - mark it as draining, which will
2086 * cause it to be freed later.
2087 */
Damien Miller76765c02002-01-22 23:21:15 +11002088 buffer_clear(&c->input);
Damien Millerb38eff82000-04-01 11:09:21 +10002089 c->type = SSH_CHANNEL_OUTPUT_DRAINING;
Damien Miller95def091999-11-25 00:26:21 +11002090 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002091}
2092
Damien Millerb38eff82000-04-01 11:09:21 +10002093/* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */
Damien Miller4af51302000-04-16 11:18:38 +10002094void
Damien Miller630d6f42002-01-22 23:17:30 +11002095channel_input_oclose(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002096{
Damien Millerb38eff82000-04-01 11:09:21 +10002097 int id = packet_get_int();
2098 Channel *c = channel_lookup(id);
Damien Miller66823cd2002-01-22 23:11:38 +11002099
Damien Miller48b03fc2002-01-22 23:11:40 +11002100 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10002101 if (c == NULL)
2102 packet_disconnect("Received oclose for nonexistent channel %d.", id);
2103 chan_rcvd_oclose(c);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002104}
2105
Damien Miller4af51302000-04-16 11:18:38 +10002106void
Damien Miller630d6f42002-01-22 23:17:30 +11002107channel_input_close_confirmation(int type, u_int32_t seq, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10002108{
2109 int id = packet_get_int();
2110 Channel *c = channel_lookup(id);
2111
Damien Miller48b03fc2002-01-22 23:11:40 +11002112 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10002113 if (c == NULL)
2114 packet_disconnect("Received close confirmation for "
2115 "out-of-range channel %d.", id);
2116 if (c->type != SSH_CHANNEL_CLOSED)
2117 packet_disconnect("Received close confirmation for "
2118 "non-closed channel %d (type %d).", id, c->type);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002119 channel_free(c);
Damien Millerb38eff82000-04-01 11:09:21 +10002120}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002121
Damien Miller4af51302000-04-16 11:18:38 +10002122void
Damien Miller630d6f42002-01-22 23:17:30 +11002123channel_input_open_confirmation(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002124{
Damien Millerb38eff82000-04-01 11:09:21 +10002125 int id, remote_id;
2126 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002127
Damien Millerb38eff82000-04-01 11:09:21 +10002128 id = packet_get_int();
2129 c = channel_lookup(id);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002130
Damien Millerb38eff82000-04-01 11:09:21 +10002131 if (c==NULL || c->type != SSH_CHANNEL_OPENING)
2132 packet_disconnect("Received open confirmation for "
2133 "non-opening channel %d.", id);
2134 remote_id = packet_get_int();
Damien Miller5428f641999-11-25 11:54:57 +11002135 /* Record the remote channel number and mark that the channel is now open. */
Damien Millerb38eff82000-04-01 11:09:21 +10002136 c->remote_id = remote_id;
2137 c->type = SSH_CHANNEL_OPEN;
Damien Miller33b13562000-04-04 14:38:59 +10002138
2139 if (compat20) {
2140 c->remote_window = packet_get_int();
2141 c->remote_maxpacket = packet_get_int();
Damien Miller67f0bc02002-02-05 12:23:08 +11002142 if (c->confirm) {
Damien Millerd3444942000-09-30 14:20:03 +11002143 debug2("callback start");
Damien Miller0e220db2004-06-15 10:34:08 +10002144 c->confirm(c->self, c->confirm_ctx);
Damien Millerd3444942000-09-30 14:20:03 +11002145 debug2("callback done");
Damien Miller33b13562000-04-04 14:38:59 +10002146 }
Damien Millerfbdeece2003-09-02 22:52:31 +10002147 debug2("channel %d: open confirm rwindow %u rmax %u", c->self,
Damien Miller33b13562000-04-04 14:38:59 +10002148 c->remote_window, c->remote_maxpacket);
2149 }
Damien Miller48b03fc2002-01-22 23:11:40 +11002150 packet_check_eom();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002151}
2152
Ben Lindstrombba81212001-06-25 05:01:22 +00002153static char *
Ben Lindstrom69128662001-05-08 20:07:39 +00002154reason2txt(int reason)
2155{
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00002156 switch (reason) {
Ben Lindstrom69128662001-05-08 20:07:39 +00002157 case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED:
2158 return "administratively prohibited";
2159 case SSH2_OPEN_CONNECT_FAILED:
2160 return "connect failed";
2161 case SSH2_OPEN_UNKNOWN_CHANNEL_TYPE:
2162 return "unknown channel type";
2163 case SSH2_OPEN_RESOURCE_SHORTAGE:
2164 return "resource shortage";
2165 }
Ben Lindstrome2595442001-06-05 20:01:39 +00002166 return "unknown reason";
Ben Lindstrom69128662001-05-08 20:07:39 +00002167}
2168
Damien Miller4af51302000-04-16 11:18:38 +10002169void
Damien Miller630d6f42002-01-22 23:17:30 +11002170channel_input_open_failure(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002171{
Kevin Steves12057502001-02-05 14:54:34 +00002172 int id, reason;
2173 char *msg = NULL, *lang = NULL;
Damien Millerb38eff82000-04-01 11:09:21 +10002174 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002175
Damien Millerb38eff82000-04-01 11:09:21 +10002176 id = packet_get_int();
2177 c = channel_lookup(id);
2178
2179 if (c==NULL || c->type != SSH_CHANNEL_OPENING)
2180 packet_disconnect("Received open failure for "
2181 "non-opening channel %d.", id);
Damien Miller33b13562000-04-04 14:38:59 +10002182 if (compat20) {
Kevin Steves12057502001-02-05 14:54:34 +00002183 reason = packet_get_int();
Ben Lindstromf3436742001-04-29 19:52:00 +00002184 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
Kevin Steves12057502001-02-05 14:54:34 +00002185 msg = packet_get_string(NULL);
2186 lang = packet_get_string(NULL);
2187 }
Damien Miller996acd22003-04-09 20:59:48 +10002188 logit("channel %d: open failed: %s%s%s", id,
Ben Lindstrom69128662001-05-08 20:07:39 +00002189 reason2txt(reason), msg ? ": ": "", msg ? msg : "");
Kevin Steves12057502001-02-05 14:54:34 +00002190 if (msg != NULL)
2191 xfree(msg);
2192 if (lang != NULL)
2193 xfree(lang);
Damien Miller33b13562000-04-04 14:38:59 +10002194 }
Damien Miller48b03fc2002-01-22 23:11:40 +11002195 packet_check_eom();
Damien Miller95def091999-11-25 00:26:21 +11002196 /* Free the channel. This will also close the socket. */
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002197 channel_free(c);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002198}
2199
Damien Miller33b13562000-04-04 14:38:59 +10002200void
Damien Miller630d6f42002-01-22 23:17:30 +11002201channel_input_window_adjust(int type, u_int32_t seq, void *ctxt)
Damien Miller33b13562000-04-04 14:38:59 +10002202{
2203 Channel *c;
Ben Lindstrom4fed2be2002-06-25 23:17:36 +00002204 int id;
2205 u_int adjust;
Damien Miller33b13562000-04-04 14:38:59 +10002206
2207 if (!compat20)
2208 return;
2209
2210 /* Get the channel number and verify it. */
2211 id = packet_get_int();
2212 c = channel_lookup(id);
2213
Damien Millerd47c62a2005-12-13 19:33:57 +11002214 if (c == NULL) {
2215 logit("Received window adjust for non-open channel %d.", id);
Damien Miller33b13562000-04-04 14:38:59 +10002216 return;
2217 }
2218 adjust = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11002219 packet_check_eom();
Ben Lindstrom4fed2be2002-06-25 23:17:36 +00002220 debug2("channel %d: rcvd adjust %u", id, adjust);
Damien Miller33b13562000-04-04 14:38:59 +10002221 c->remote_window += adjust;
2222}
2223
Damien Miller4af51302000-04-16 11:18:38 +10002224void
Damien Miller630d6f42002-01-22 23:17:30 +11002225channel_input_port_open(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002226{
Ben Lindstrome9c99912001-06-09 00:41:05 +00002227 Channel *c = NULL;
2228 u_short host_port;
2229 char *host, *originator_string;
2230 int remote_id, sock = -1;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002231
Ben Lindstrome9c99912001-06-09 00:41:05 +00002232 remote_id = packet_get_int();
2233 host = packet_get_string(NULL);
2234 host_port = packet_get_int();
2235
2236 if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) {
2237 originator_string = packet_get_string(NULL);
2238 } else {
2239 originator_string = xstrdup("unknown (remote did not supply name)");
2240 }
Damien Miller48b03fc2002-01-22 23:11:40 +11002241 packet_check_eom();
Ben Lindstrome9c99912001-06-09 00:41:05 +00002242 sock = channel_connect_to(host, host_port);
2243 if (sock != -1) {
2244 c = channel_new("connected socket",
2245 SSH_CHANNEL_CONNECTING, sock, sock, -1, 0, 0, 0,
2246 originator_string, 1);
Damien Miller699d0032002-02-08 22:07:16 +11002247 c->remote_id = remote_id;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002248 }
Damien Millerb1ca8bb2003-05-14 13:45:42 +10002249 xfree(originator_string);
Ben Lindstrome9c99912001-06-09 00:41:05 +00002250 if (c == NULL) {
2251 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
2252 packet_put_int(remote_id);
2253 packet_send();
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002254 }
Ben Lindstrome9c99912001-06-09 00:41:05 +00002255 xfree(host);
Ben Lindstrom5744dc42001-04-13 23:28:01 +00002256}
2257
2258
Ben Lindstrome9c99912001-06-09 00:41:05 +00002259/* -- tcp forwarding */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002260
Ben Lindstrom908afed2001-10-03 17:34:59 +00002261void
2262channel_set_af(int af)
2263{
2264 IPv4or6 = af;
2265}
2266
Damien Millerb16461c2002-01-22 23:29:22 +11002267static int
2268channel_setup_fwd_listener(int type, const char *listen_addr, u_short listen_port,
2269 const char *host_to_connect, u_short port_to_connect, int gateway_ports)
Damien Miller0bc1bd82000-11-13 22:57:25 +11002270{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002271 Channel *c;
Damien Miller5e7fd072005-11-05 14:53:39 +11002272 int sock, r, success = 0, wildcard = 0, is_client;
Damien Miller34132e52000-01-14 15:45:46 +11002273 struct addrinfo hints, *ai, *aitop;
Damien Millerf91ee4c2005-03-01 21:24:33 +11002274 const char *host, *addr;
Damien Millerb16461c2002-01-22 23:29:22 +11002275 char ntop[NI_MAXHOST], strport[NI_MAXSERV];
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002276
Damien Millerb16461c2002-01-22 23:29:22 +11002277 host = (type == SSH_CHANNEL_RPORT_LISTENER) ?
2278 listen_addr : host_to_connect;
Damien Millerf91ee4c2005-03-01 21:24:33 +11002279 is_client = (type == SSH_CHANNEL_PORT_LISTENER);
Kevin Steves12057502001-02-05 14:54:34 +00002280
Damien Millerb16461c2002-01-22 23:29:22 +11002281 if (host == NULL) {
2282 error("No forward host name.");
Damien Millera7270302005-07-06 09:36:05 +10002283 return 0;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002284 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002285 if (strlen(host) > SSH_CHANNEL_PATH_LEN - 1) {
Kevin Steves12057502001-02-05 14:54:34 +00002286 error("Forward host name too long.");
Damien Millera7270302005-07-06 09:36:05 +10002287 return 0;
Kevin Steves12057502001-02-05 14:54:34 +00002288 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002289
Damien Miller5428f641999-11-25 11:54:57 +11002290 /*
Damien Millerf91ee4c2005-03-01 21:24:33 +11002291 * Determine whether or not a port forward listens to loopback,
Darren Tucker47eede72005-03-14 23:08:12 +11002292 * specified address or wildcard. On the client, a specified bind
2293 * address will always override gateway_ports. On the server, a
2294 * gateway_ports of 1 (``yes'') will override the client's
2295 * specification and force a wildcard bind, whereas a value of 2
2296 * (``clientspecified'') will bind to whatever address the client
Damien Millerf91ee4c2005-03-01 21:24:33 +11002297 * asked for.
2298 *
2299 * Special-case listen_addrs are:
2300 *
2301 * "0.0.0.0" -> wildcard v4/v6 if SSH_OLD_FORWARD_ADDR
2302 * "" (empty string), "*" -> wildcard v4/v6
2303 * "localhost" -> loopback v4/v6
2304 */
2305 addr = NULL;
2306 if (listen_addr == NULL) {
2307 /* No address specified: default to gateway_ports setting */
2308 if (gateway_ports)
2309 wildcard = 1;
2310 } else if (gateway_ports || is_client) {
2311 if (((datafellows & SSH_OLD_FORWARD_ADDR) &&
2312 strcmp(listen_addr, "0.0.0.0") == 0) ||
2313 *listen_addr == '\0' || strcmp(listen_addr, "*") == 0 ||
2314 (!is_client && gateway_ports == 1))
2315 wildcard = 1;
2316 else if (strcmp(listen_addr, "localhost") != 0)
2317 addr = listen_addr;
2318 }
2319
2320 debug3("channel_setup_fwd_listener: type %d wildcard %d addr %s",
2321 type, wildcard, (addr == NULL) ? "NULL" : addr);
2322
2323 /*
Damien Miller34132e52000-01-14 15:45:46 +11002324 * getaddrinfo returns a loopback address if the hostname is
2325 * set to NULL and hints.ai_flags is not AI_PASSIVE
Damien Miller5428f641999-11-25 11:54:57 +11002326 */
Damien Miller34132e52000-01-14 15:45:46 +11002327 memset(&hints, 0, sizeof(hints));
2328 hints.ai_family = IPv4or6;
Damien Millerf91ee4c2005-03-01 21:24:33 +11002329 hints.ai_flags = wildcard ? AI_PASSIVE : 0;
Damien Miller34132e52000-01-14 15:45:46 +11002330 hints.ai_socktype = SOCK_STREAM;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002331 snprintf(strport, sizeof strport, "%d", listen_port);
Damien Millerf91ee4c2005-03-01 21:24:33 +11002332 if ((r = getaddrinfo(addr, strport, &hints, &aitop)) != 0) {
2333 if (addr == NULL) {
2334 /* This really shouldn't happen */
2335 packet_disconnect("getaddrinfo: fatal error: %s",
2336 gai_strerror(r));
2337 } else {
Damien Millera7270302005-07-06 09:36:05 +10002338 error("channel_setup_fwd_listener: "
Damien Millerf91ee4c2005-03-01 21:24:33 +11002339 "getaddrinfo(%.64s): %s", addr, gai_strerror(r));
2340 }
Damien Millera7270302005-07-06 09:36:05 +10002341 return 0;
Damien Millerf91ee4c2005-03-01 21:24:33 +11002342 }
Damien Miller5428f641999-11-25 11:54:57 +11002343
Damien Miller34132e52000-01-14 15:45:46 +11002344 for (ai = aitop; ai; ai = ai->ai_next) {
2345 if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
2346 continue;
2347 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop),
2348 strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
Damien Millerb16461c2002-01-22 23:29:22 +11002349 error("channel_setup_fwd_listener: getnameinfo failed");
Damien Miller34132e52000-01-14 15:45:46 +11002350 continue;
2351 }
2352 /* Create a port to listen for the host. */
Damien Miller2372ace2003-05-14 13:42:23 +10002353 sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
Damien Miller34132e52000-01-14 15:45:46 +11002354 if (sock < 0) {
2355 /* this is no error since kernel may not support ipv6 */
2356 verbose("socket: %.100s", strerror(errno));
2357 continue;
2358 }
Damien Miller5e7fd072005-11-05 14:53:39 +11002359
2360 channel_set_reuseaddr(sock);
Damien Millere1383ce2002-09-19 11:49:37 +10002361
Damien Miller34132e52000-01-14 15:45:46 +11002362 debug("Local forwarding listening on %s port %s.", ntop, strport);
Damien Miller95def091999-11-25 00:26:21 +11002363
Damien Miller34132e52000-01-14 15:45:46 +11002364 /* Bind the socket to the address. */
2365 if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
2366 /* address can be in use ipv6 address is already bound */
Damien Miller3c7eeb22000-03-03 22:35:33 +11002367 if (!ai->ai_next)
2368 error("bind: %.100s", strerror(errno));
2369 else
2370 verbose("bind: %.100s", strerror(errno));
Kevin Stevesef4eea92001-02-05 12:42:17 +00002371
Damien Miller34132e52000-01-14 15:45:46 +11002372 close(sock);
2373 continue;
2374 }
2375 /* Start listening for connections on the socket. */
Darren Tucker3175eb92003-12-09 19:15:11 +11002376 if (listen(sock, SSH_LISTEN_BACKLOG) < 0) {
Damien Miller34132e52000-01-14 15:45:46 +11002377 error("listen: %.100s", strerror(errno));
2378 close(sock);
2379 continue;
2380 }
2381 /* Allocate a channel number for the socket. */
Ben Lindstrome9c99912001-06-09 00:41:05 +00002382 c = channel_new("port listener", type, sock, sock, -1,
Damien Millerbd483e72000-04-30 10:00:53 +10002383 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10002384 0, "port listener", 1);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002385 strlcpy(c->path, host, sizeof(c->path));
2386 c->host_port = port_to_connect;
2387 c->listening_port = listen_port;
Damien Miller34132e52000-01-14 15:45:46 +11002388 success = 1;
2389 }
2390 if (success == 0)
Damien Millerb16461c2002-01-22 23:29:22 +11002391 error("channel_setup_fwd_listener: cannot listen to port: %d",
Kevin Steves12057502001-02-05 14:54:34 +00002392 listen_port);
Damien Miller34132e52000-01-14 15:45:46 +11002393 freeaddrinfo(aitop);
Kevin Steves12057502001-02-05 14:54:34 +00002394 return success;
Damien Miller95def091999-11-25 00:26:21 +11002395}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002396
Darren Tuckere7066df2004-05-24 10:18:05 +10002397int
2398channel_cancel_rport_listener(const char *host, u_short port)
2399{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10002400 u_int i;
2401 int found = 0;
Darren Tuckere7066df2004-05-24 10:18:05 +10002402
Darren Tucker47eede72005-03-14 23:08:12 +11002403 for (i = 0; i < channels_alloc; i++) {
Darren Tuckere7066df2004-05-24 10:18:05 +10002404 Channel *c = channels[i];
2405
2406 if (c != NULL && c->type == SSH_CHANNEL_RPORT_LISTENER &&
2407 strncmp(c->path, host, sizeof(c->path)) == 0 &&
Darren Tuckerfc959702004-07-17 16:12:08 +10002408 c->listening_port == port) {
Darren Tuckere6ed8392004-08-29 16:29:44 +10002409 debug2("%s: close channel %d", __func__, i);
Darren Tuckere7066df2004-05-24 10:18:05 +10002410 channel_free(c);
2411 found = 1;
2412 }
2413 }
2414
2415 return (found);
2416}
2417
Damien Millerb16461c2002-01-22 23:29:22 +11002418/* protocol local port fwd, used by ssh (and sshd in v1) */
2419int
Damien Millerf91ee4c2005-03-01 21:24:33 +11002420channel_setup_local_fwd_listener(const char *listen_host, u_short listen_port,
Damien Millerb16461c2002-01-22 23:29:22 +11002421 const char *host_to_connect, u_short port_to_connect, int gateway_ports)
2422{
2423 return channel_setup_fwd_listener(SSH_CHANNEL_PORT_LISTENER,
Damien Millerf91ee4c2005-03-01 21:24:33 +11002424 listen_host, listen_port, host_to_connect, port_to_connect,
2425 gateway_ports);
Damien Millerb16461c2002-01-22 23:29:22 +11002426}
2427
2428/* protocol v2 remote port fwd, used by sshd */
2429int
2430channel_setup_remote_fwd_listener(const char *listen_address,
2431 u_short listen_port, int gateway_ports)
2432{
2433 return channel_setup_fwd_listener(SSH_CHANNEL_RPORT_LISTENER,
2434 listen_address, listen_port, NULL, 0, gateway_ports);
2435}
2436
Damien Miller5428f641999-11-25 11:54:57 +11002437/*
2438 * Initiate forwarding of connections to port "port" on remote host through
2439 * the secure channel to host:port from local side.
2440 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002441
Damien Miller4af51302000-04-16 11:18:38 +10002442void
Damien Millerf91ee4c2005-03-01 21:24:33 +11002443channel_request_remote_forwarding(const char *listen_host, u_short listen_port,
Damien Miller0bc1bd82000-11-13 22:57:25 +11002444 const char *host_to_connect, u_short port_to_connect)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002445{
Damien Millerdff50992002-01-22 23:16:32 +11002446 int type, success = 0;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002447
Damien Miller95def091999-11-25 00:26:21 +11002448 /* Record locally that connection to this host/port is permitted. */
2449 if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION)
2450 fatal("channel_request_remote_forwarding: too many forwards");
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002451
Damien Miller95def091999-11-25 00:26:21 +11002452 /* Send the forward request to the remote side. */
Damien Miller33b13562000-04-04 14:38:59 +10002453 if (compat20) {
Damien Millerf91ee4c2005-03-01 21:24:33 +11002454 const char *address_to_bind;
2455 if (listen_host == NULL)
2456 address_to_bind = "localhost";
2457 else if (*listen_host == '\0' || strcmp(listen_host, "*") == 0)
2458 address_to_bind = "";
2459 else
2460 address_to_bind = listen_host;
2461
Damien Miller33b13562000-04-04 14:38:59 +10002462 packet_start(SSH2_MSG_GLOBAL_REQUEST);
2463 packet_put_cstring("tcpip-forward");
Damien Miller2797f7f2002-04-23 21:09:44 +10002464 packet_put_char(1); /* boolean: want reply */
Damien Miller33b13562000-04-04 14:38:59 +10002465 packet_put_cstring(address_to_bind);
2466 packet_put_int(listen_port);
Damien Miller0bc1bd82000-11-13 22:57:25 +11002467 packet_send();
2468 packet_write_wait();
2469 /* Assume that server accepts the request */
2470 success = 1;
Damien Miller33b13562000-04-04 14:38:59 +10002471 } else {
2472 packet_start(SSH_CMSG_PORT_FORWARD_REQUEST);
Damien Miller33b13562000-04-04 14:38:59 +10002473 packet_put_int(listen_port);
Damien Miller8bb73be2000-04-19 16:26:12 +10002474 packet_put_cstring(host_to_connect);
2475 packet_put_int(port_to_connect);
Damien Miller33b13562000-04-04 14:38:59 +10002476 packet_send();
2477 packet_write_wait();
Damien Miller0bc1bd82000-11-13 22:57:25 +11002478
2479 /* Wait for response from the remote side. */
Damien Millerdff50992002-01-22 23:16:32 +11002480 type = packet_read();
Damien Miller0bc1bd82000-11-13 22:57:25 +11002481 switch (type) {
2482 case SSH_SMSG_SUCCESS:
2483 success = 1;
2484 break;
2485 case SSH_SMSG_FAILURE:
Damien Miller996acd22003-04-09 20:59:48 +10002486 logit("Warning: Server denied remote port forwarding.");
Damien Miller0bc1bd82000-11-13 22:57:25 +11002487 break;
2488 default:
2489 /* Unknown packet */
2490 packet_disconnect("Protocol error for port forward request:"
2491 "received packet type %d.", type);
2492 }
2493 }
2494 if (success) {
2495 permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host_to_connect);
2496 permitted_opens[num_permitted_opens].port_to_connect = port_to_connect;
2497 permitted_opens[num_permitted_opens].listen_port = listen_port;
2498 num_permitted_opens++;
Damien Miller33b13562000-04-04 14:38:59 +10002499 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002500}
2501
Damien Miller5428f641999-11-25 11:54:57 +11002502/*
Darren Tuckerfc959702004-07-17 16:12:08 +10002503 * Request cancellation of remote forwarding of connection host:port from
Darren Tuckere7066df2004-05-24 10:18:05 +10002504 * local side.
2505 */
Darren Tuckere7066df2004-05-24 10:18:05 +10002506void
Damien Millerf91ee4c2005-03-01 21:24:33 +11002507channel_request_rforward_cancel(const char *host, u_short port)
Darren Tuckere7066df2004-05-24 10:18:05 +10002508{
2509 int i;
Darren Tuckere7066df2004-05-24 10:18:05 +10002510
2511 if (!compat20)
2512 return;
2513
2514 for (i = 0; i < num_permitted_opens; i++) {
Darren Tuckerfc959702004-07-17 16:12:08 +10002515 if (permitted_opens[i].host_to_connect != NULL &&
Darren Tuckere7066df2004-05-24 10:18:05 +10002516 permitted_opens[i].listen_port == port)
2517 break;
2518 }
2519 if (i >= num_permitted_opens) {
2520 debug("%s: requested forward not found", __func__);
2521 return;
2522 }
2523 packet_start(SSH2_MSG_GLOBAL_REQUEST);
2524 packet_put_cstring("cancel-tcpip-forward");
2525 packet_put_char(0);
Damien Millerf91ee4c2005-03-01 21:24:33 +11002526 packet_put_cstring(host == NULL ? "" : host);
Darren Tuckere7066df2004-05-24 10:18:05 +10002527 packet_put_int(port);
2528 packet_send();
2529
2530 permitted_opens[i].listen_port = 0;
2531 permitted_opens[i].port_to_connect = 0;
Damien Miller0a0176e2005-11-05 15:07:59 +11002532 xfree(permitted_opens[i].host_to_connect);
Darren Tuckere7066df2004-05-24 10:18:05 +10002533 permitted_opens[i].host_to_connect = NULL;
2534}
2535
2536/*
Damien Miller5428f641999-11-25 11:54:57 +11002537 * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates
2538 * listening for the port, and sends back a success reply (or disconnect
2539 * message if there was an error). This never returns if there was an error.
2540 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002541
Damien Miller4af51302000-04-16 11:18:38 +10002542void
Damien Millere247cc42000-05-07 12:03:14 +10002543channel_input_port_forward_request(int is_root, int gateway_ports)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002544{
Damien Milleraae6c611999-12-06 11:47:28 +11002545 u_short port, host_port;
Damien Miller95def091999-11-25 00:26:21 +11002546 char *hostname;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002547
Damien Miller95def091999-11-25 00:26:21 +11002548 /* Get arguments from the packet. */
2549 port = packet_get_int();
2550 hostname = packet_get_string(NULL);
2551 host_port = packet_get_int();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002552
Damien Millerbac2d8a2000-09-05 16:13:06 +11002553#ifndef HAVE_CYGWIN
Damien Miller5428f641999-11-25 11:54:57 +11002554 /*
2555 * Check that an unprivileged user is not trying to forward a
2556 * privileged port.
2557 */
Damien Miller95def091999-11-25 00:26:21 +11002558 if (port < IPPORT_RESERVED && !is_root)
Darren Tucker9189ff82003-07-03 13:52:04 +10002559 packet_disconnect(
2560 "Requested forwarding of port %d but user is not root.",
2561 port);
2562 if (host_port == 0)
2563 packet_disconnect("Dynamic forwarding denied.");
Damien Millerbac2d8a2000-09-05 16:13:06 +11002564#endif
Darren Tucker9189ff82003-07-03 13:52:04 +10002565
Damien Miller0bc1bd82000-11-13 22:57:25 +11002566 /* Initiate forwarding */
Damien Millerf91ee4c2005-03-01 21:24:33 +11002567 channel_setup_local_fwd_listener(NULL, port, hostname,
2568 host_port, gateway_ports);
Damien Miller95def091999-11-25 00:26:21 +11002569
2570 /* Free the argument string. */
2571 xfree(hostname);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002572}
2573
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002574/*
2575 * Permits opening to any host/port if permitted_opens[] is empty. This is
2576 * usually called by the server, because the user could connect to any port
2577 * anyway, and the server has no way to know but to trust the client anyway.
2578 */
2579void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00002580channel_permit_all_opens(void)
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002581{
2582 if (num_permitted_opens == 0)
2583 all_opens_permitted = 1;
2584}
2585
Ben Lindstroma3700052001-04-05 23:26:32 +00002586void
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002587channel_add_permitted_opens(char *host, int port)
2588{
2589 if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION)
2590 fatal("channel_request_remote_forwarding: too many forwards");
2591 debug("allow port forwarding to host %s port %d", host, port);
2592
2593 permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host);
2594 permitted_opens[num_permitted_opens].port_to_connect = port;
2595 num_permitted_opens++;
2596
2597 all_opens_permitted = 0;
2598}
2599
Ben Lindstroma3700052001-04-05 23:26:32 +00002600void
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002601channel_clear_permitted_opens(void)
2602{
2603 int i;
2604
2605 for (i = 0; i < num_permitted_opens; i++)
Darren Tuckere7066df2004-05-24 10:18:05 +10002606 if (permitted_opens[i].host_to_connect != NULL)
2607 xfree(permitted_opens[i].host_to_connect);
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002608 num_permitted_opens = 0;
2609
2610}
2611
2612
2613/* return socket to remote host, port */
Ben Lindstrombba81212001-06-25 05:01:22 +00002614static int
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002615connect_to(const char *host, u_short port)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002616{
Damien Miller34132e52000-01-14 15:45:46 +11002617 struct addrinfo hints, *ai, *aitop;
2618 char ntop[NI_MAXHOST], strport[NI_MAXSERV];
2619 int gaierr;
Damien Millerb38eff82000-04-01 11:09:21 +10002620 int sock = -1;
Damien Miller95def091999-11-25 00:26:21 +11002621
Damien Miller34132e52000-01-14 15:45:46 +11002622 memset(&hints, 0, sizeof(hints));
2623 hints.ai_family = IPv4or6;
2624 hints.ai_socktype = SOCK_STREAM;
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002625 snprintf(strport, sizeof strport, "%d", port);
Damien Miller34132e52000-01-14 15:45:46 +11002626 if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) {
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002627 error("connect_to %.100s: unknown host (%s)", host,
2628 gai_strerror(gaierr));
Damien Millerb38eff82000-04-01 11:09:21 +10002629 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002630 }
Damien Miller34132e52000-01-14 15:45:46 +11002631 for (ai = aitop; ai; ai = ai->ai_next) {
2632 if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
2633 continue;
2634 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop),
2635 strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002636 error("connect_to: getnameinfo failed");
Damien Miller34132e52000-01-14 15:45:46 +11002637 continue;
2638 }
Damien Miller2372ace2003-05-14 13:42:23 +10002639 sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
Damien Miller34132e52000-01-14 15:45:46 +11002640 if (sock < 0) {
Damien Millerb46b9f32003-01-10 21:45:12 +11002641 if (ai->ai_next == NULL)
2642 error("socket: %.100s", strerror(errno));
2643 else
2644 verbose("socket: %.100s", strerror(errno));
Damien Miller34132e52000-01-14 15:45:46 +11002645 continue;
2646 }
Damien Miller232711f2004-06-15 10:35:30 +10002647 if (set_nonblock(sock) == -1)
2648 fatal("%s: set_nonblock(%d)", __func__, sock);
Ben Lindstrom7ad97102000-12-06 01:42:49 +00002649 if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0 &&
2650 errno != EINPROGRESS) {
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002651 error("connect_to %.100s port %s: %.100s", ntop, strport,
Damien Miller34132e52000-01-14 15:45:46 +11002652 strerror(errno));
2653 close(sock);
Kevin Stevesef4eea92001-02-05 12:42:17 +00002654 continue; /* fail -- try next */
Damien Miller34132e52000-01-14 15:45:46 +11002655 }
2656 break; /* success */
2657
2658 }
2659 freeaddrinfo(aitop);
Damien Miller34132e52000-01-14 15:45:46 +11002660 if (!ai) {
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002661 error("connect_to %.100s port %d: failed.", host, port);
Damien Millerb38eff82000-04-01 11:09:21 +10002662 return -1;
2663 }
2664 /* success */
Ben Lindstrom1ebd7a52002-02-26 18:12:51 +00002665 set_nodelay(sock);
Damien Millerb38eff82000-04-01 11:09:21 +10002666 return sock;
2667}
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002668
Damien Miller0bc1bd82000-11-13 22:57:25 +11002669int
Ben Lindstrom173e6462001-07-04 05:15:15 +00002670channel_connect_by_listen_address(u_short listen_port)
Damien Miller0bc1bd82000-11-13 22:57:25 +11002671{
2672 int i;
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002673
Damien Miller0bc1bd82000-11-13 22:57:25 +11002674 for (i = 0; i < num_permitted_opens; i++)
Darren Tuckere7066df2004-05-24 10:18:05 +10002675 if (permitted_opens[i].host_to_connect != NULL &&
2676 permitted_opens[i].listen_port == listen_port)
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002677 return connect_to(
Damien Miller0bc1bd82000-11-13 22:57:25 +11002678 permitted_opens[i].host_to_connect,
2679 permitted_opens[i].port_to_connect);
Ben Lindstromc72745a2000-12-02 19:03:54 +00002680 error("WARNING: Server requests forwarding for unknown listen_port %d",
2681 listen_port);
Damien Miller0bc1bd82000-11-13 22:57:25 +11002682 return -1;
2683}
Damien Millerb38eff82000-04-01 11:09:21 +10002684
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002685/* Check if connecting to that port is permitted and connect. */
2686int
2687channel_connect_to(const char *host, u_short port)
2688{
2689 int i, permit;
2690
2691 permit = all_opens_permitted;
2692 if (!permit) {
2693 for (i = 0; i < num_permitted_opens; i++)
Darren Tuckere7066df2004-05-24 10:18:05 +10002694 if (permitted_opens[i].host_to_connect != NULL &&
2695 permitted_opens[i].port_to_connect == port &&
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002696 strcmp(permitted_opens[i].host_to_connect, host) == 0)
2697 permit = 1;
2698
2699 }
2700 if (!permit) {
Damien Miller996acd22003-04-09 20:59:48 +10002701 logit("Received request to connect to host %.100s port %d, "
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002702 "but the request was denied.", host, port);
2703 return -1;
2704 }
2705 return connect_to(host, port);
2706}
2707
Damien Miller0e220db2004-06-15 10:34:08 +10002708void
2709channel_send_window_changes(void)
2710{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10002711 u_int i;
Damien Miller0e220db2004-06-15 10:34:08 +10002712 struct winsize ws;
2713
2714 for (i = 0; i < channels_alloc; i++) {
Darren Tucker47eede72005-03-14 23:08:12 +11002715 if (channels[i] == NULL || !channels[i]->client_tty ||
Damien Miller0e220db2004-06-15 10:34:08 +10002716 channels[i]->type != SSH_CHANNEL_OPEN)
2717 continue;
2718 if (ioctl(channels[i]->rfd, TIOCGWINSZ, &ws) < 0)
2719 continue;
2720 channel_request_start(i, "window-change", 0);
2721 packet_put_int(ws.ws_col);
2722 packet_put_int(ws.ws_row);
2723 packet_put_int(ws.ws_xpixel);
2724 packet_put_int(ws.ws_ypixel);
2725 packet_send();
2726 }
2727}
2728
Ben Lindstrome9c99912001-06-09 00:41:05 +00002729/* -- X11 forwarding */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002730
Damien Miller5428f641999-11-25 11:54:57 +11002731/*
2732 * Creates an internet domain socket for listening for X11 connections.
Ben Lindstroma9d2c892002-06-23 21:48:28 +00002733 * Returns 0 and a suitable display number for the DISPLAY variable
2734 * stored in display_numberp , or -1 if an error occurs.
Damien Miller5428f641999-11-25 11:54:57 +11002735 */
Kevin Steves366298c2001-12-19 17:58:01 +00002736int
Damien Miller95c249f2002-02-05 12:11:34 +11002737x11_create_display_inet(int x11_display_offset, int x11_use_localhost,
Damien Miller2b9b0452005-07-17 17:19:24 +10002738 int single_connection, u_int *display_numberp, int **chanids)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002739{
Damien Millere7378562001-12-21 14:58:35 +11002740 Channel *nc = NULL;
Damien Milleraae6c611999-12-06 11:47:28 +11002741 int display_number, sock;
2742 u_short port;
Damien Miller34132e52000-01-14 15:45:46 +11002743 struct addrinfo hints, *ai, *aitop;
2744 char strport[NI_MAXSERV];
2745 int gaierr, n, num_socks = 0, socks[NUM_SOCKS];
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002746
Darren Tuckerd3d0fa12005-10-03 18:03:05 +10002747 if (chanids == NULL)
2748 return -1;
2749
Damien Millera34a28b1999-12-14 10:47:15 +11002750 for (display_number = x11_display_offset;
Damien Miller9f0f5c62001-12-21 14:45:46 +11002751 display_number < MAX_DISPLAYS;
2752 display_number++) {
Damien Miller95def091999-11-25 00:26:21 +11002753 port = 6000 + display_number;
Damien Miller34132e52000-01-14 15:45:46 +11002754 memset(&hints, 0, sizeof(hints));
2755 hints.ai_family = IPv4or6;
Damien Miller95c249f2002-02-05 12:11:34 +11002756 hints.ai_flags = x11_use_localhost ? 0: AI_PASSIVE;
Damien Miller34132e52000-01-14 15:45:46 +11002757 hints.ai_socktype = SOCK_STREAM;
2758 snprintf(strport, sizeof strport, "%d", port);
2759 if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) {
2760 error("getaddrinfo: %.100s", gai_strerror(gaierr));
Kevin Steves366298c2001-12-19 17:58:01 +00002761 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002762 }
Damien Miller34132e52000-01-14 15:45:46 +11002763 for (ai = aitop; ai; ai = ai->ai_next) {
2764 if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
2765 continue;
Damien Miller2372ace2003-05-14 13:42:23 +10002766 sock = socket(ai->ai_family, ai->ai_socktype,
2767 ai->ai_protocol);
Damien Miller34132e52000-01-14 15:45:46 +11002768 if (sock < 0) {
Damien Miller89d97962000-10-14 12:37:19 +11002769 if ((errno != EINVAL) && (errno != EAFNOSUPPORT)) {
Damien Millere2192732000-01-17 13:22:55 +11002770 error("socket: %.100s", strerror(errno));
Damien Miller3e4dffb2004-06-15 10:27:15 +10002771 freeaddrinfo(aitop);
Kevin Steves366298c2001-12-19 17:58:01 +00002772 return -1;
Damien Millere2192732000-01-17 13:22:55 +11002773 } else {
Damien Millercb5e44a2000-09-29 12:12:36 +11002774 debug("x11_create_display_inet: Socket family %d not supported",
2775 ai->ai_family);
Damien Millere2192732000-01-17 13:22:55 +11002776 continue;
2777 }
Damien Miller34132e52000-01-14 15:45:46 +11002778 }
Kevin Stevesdf75dd22002-06-04 20:52:19 +00002779#ifdef IPV6_V6ONLY
2780 if (ai->ai_family == AF_INET6) {
2781 int on = 1;
2782 if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) < 0)
2783 error("setsockopt IPV6_V6ONLY: %.100s", strerror(errno));
2784 }
2785#endif
Damien Miller5e7fd072005-11-05 14:53:39 +11002786 channel_set_reuseaddr(sock);
Damien Miller34132e52000-01-14 15:45:46 +11002787 if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +10002788 debug2("bind port %d: %.100s", port, strerror(errno));
Damien Miller34132e52000-01-14 15:45:46 +11002789 close(sock);
Damien Miller3c7eeb22000-03-03 22:35:33 +11002790
2791 if (ai->ai_next)
2792 continue;
2793
Damien Miller34132e52000-01-14 15:45:46 +11002794 for (n = 0; n < num_socks; n++) {
Damien Miller34132e52000-01-14 15:45:46 +11002795 close(socks[n]);
2796 }
2797 num_socks = 0;
2798 break;
2799 }
2800 socks[num_socks++] = sock;
Damien Miller7bcb0892000-03-11 20:45:40 +11002801#ifndef DONT_TRY_OTHER_AF
Damien Miller34132e52000-01-14 15:45:46 +11002802 if (num_socks == NUM_SOCKS)
2803 break;
Damien Miller7bcb0892000-03-11 20:45:40 +11002804#else
Kevin Stevesdf75dd22002-06-04 20:52:19 +00002805 if (x11_use_localhost) {
2806 if (num_socks == NUM_SOCKS)
2807 break;
2808 } else {
2809 break;
2810 }
Damien Miller7bcb0892000-03-11 20:45:40 +11002811#endif
Damien Miller95def091999-11-25 00:26:21 +11002812 }
Ben Lindstrom87b147f2001-01-25 00:41:12 +00002813 freeaddrinfo(aitop);
Damien Miller34132e52000-01-14 15:45:46 +11002814 if (num_socks > 0)
2815 break;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002816 }
Damien Miller95def091999-11-25 00:26:21 +11002817 if (display_number >= MAX_DISPLAYS) {
2818 error("Failed to allocate internet-domain X11 display socket.");
Kevin Steves366298c2001-12-19 17:58:01 +00002819 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002820 }
Damien Miller95def091999-11-25 00:26:21 +11002821 /* Start listening for connections on the socket. */
Damien Miller34132e52000-01-14 15:45:46 +11002822 for (n = 0; n < num_socks; n++) {
2823 sock = socks[n];
Darren Tucker3175eb92003-12-09 19:15:11 +11002824 if (listen(sock, SSH_LISTEN_BACKLOG) < 0) {
Damien Miller34132e52000-01-14 15:45:46 +11002825 error("listen: %.100s", strerror(errno));
Damien Miller34132e52000-01-14 15:45:46 +11002826 close(sock);
Kevin Steves366298c2001-12-19 17:58:01 +00002827 return -1;
Damien Miller34132e52000-01-14 15:45:46 +11002828 }
Damien Miller95def091999-11-25 00:26:21 +11002829 }
Damien Miller34132e52000-01-14 15:45:46 +11002830
Damien Miller34132e52000-01-14 15:45:46 +11002831 /* Allocate a channel for each socket. */
Darren Tuckerd3d0fa12005-10-03 18:03:05 +10002832 *chanids = xmalloc(sizeof(**chanids) * (num_socks + 1));
Damien Miller34132e52000-01-14 15:45:46 +11002833 for (n = 0; n < num_socks; n++) {
2834 sock = socks[n];
Damien Millere7378562001-12-21 14:58:35 +11002835 nc = channel_new("x11 listener",
Damien Millerbd483e72000-04-30 10:00:53 +10002836 SSH_CHANNEL_X11_LISTENER, sock, sock, -1,
2837 CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10002838 0, "X11 inet listener", 1);
Damien Miller699d0032002-02-08 22:07:16 +11002839 nc->single_connection = single_connection;
Darren Tuckerd3d0fa12005-10-03 18:03:05 +10002840 (*chanids)[n] = nc->self;
Damien Miller34132e52000-01-14 15:45:46 +11002841 }
Darren Tuckerd3d0fa12005-10-03 18:03:05 +10002842 (*chanids)[n] = -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002843
Kevin Steves366298c2001-12-19 17:58:01 +00002844 /* Return the display number for the DISPLAY environment variable. */
Ben Lindstroma9d2c892002-06-23 21:48:28 +00002845 *display_numberp = display_number;
2846 return (0);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002847}
2848
Ben Lindstrombba81212001-06-25 05:01:22 +00002849static int
Ben Lindstrom46c16222000-12-22 01:43:59 +00002850connect_local_xsocket(u_int dnr)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002851{
Damien Miller95def091999-11-25 00:26:21 +11002852 int sock;
2853 struct sockaddr_un addr;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002854
Damien Miller3afe3752001-12-21 12:39:51 +11002855 sock = socket(AF_UNIX, SOCK_STREAM, 0);
2856 if (sock < 0)
2857 error("socket: %.100s", strerror(errno));
2858 memset(&addr, 0, sizeof(addr));
2859 addr.sun_family = AF_UNIX;
2860 snprintf(addr.sun_path, sizeof addr.sun_path, _PATH_UNIX_X, dnr);
2861 if (connect(sock, (struct sockaddr *) & addr, sizeof(addr)) == 0)
2862 return sock;
2863 close(sock);
Damien Miller95def091999-11-25 00:26:21 +11002864 error("connect %.100s: %.100s", addr.sun_path, strerror(errno));
2865 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002866}
2867
Damien Millerbd483e72000-04-30 10:00:53 +10002868int
2869x11_connect_display(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002870{
Damien Miller398e1cf2002-02-05 11:52:13 +11002871 int display_number, sock = 0;
Damien Miller95def091999-11-25 00:26:21 +11002872 const char *display;
Damien Millerbd483e72000-04-30 10:00:53 +10002873 char buf[1024], *cp;
Damien Miller34132e52000-01-14 15:45:46 +11002874 struct addrinfo hints, *ai, *aitop;
2875 char strport[NI_MAXSERV];
2876 int gaierr;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002877
Damien Miller95def091999-11-25 00:26:21 +11002878 /* Try to open a socket for the local X server. */
2879 display = getenv("DISPLAY");
2880 if (!display) {
2881 error("DISPLAY not set.");
Damien Millerbd483e72000-04-30 10:00:53 +10002882 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002883 }
Damien Miller5428f641999-11-25 11:54:57 +11002884 /*
2885 * Now we decode the value of the DISPLAY variable and make a
2886 * connection to the real X server.
2887 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002888
Damien Miller5428f641999-11-25 11:54:57 +11002889 /*
2890 * Check if it is a unix domain socket. Unix domain displays are in
2891 * one of the following formats: unix:d[.s], :d[.s], ::d[.s]
2892 */
Damien Miller95def091999-11-25 00:26:21 +11002893 if (strncmp(display, "unix:", 5) == 0 ||
2894 display[0] == ':') {
2895 /* Connect to the unix domain socket. */
2896 if (sscanf(strrchr(display, ':') + 1, "%d", &display_number) != 1) {
2897 error("Could not parse display number from DISPLAY: %.100s",
Damien Miller9f0f5c62001-12-21 14:45:46 +11002898 display);
Damien Millerbd483e72000-04-30 10:00:53 +10002899 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002900 }
2901 /* Create a socket. */
2902 sock = connect_local_xsocket(display_number);
2903 if (sock < 0)
Damien Millerbd483e72000-04-30 10:00:53 +10002904 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002905
2906 /* OK, we now have a connection to the display. */
Damien Millerbd483e72000-04-30 10:00:53 +10002907 return sock;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002908 }
Damien Miller5428f641999-11-25 11:54:57 +11002909 /*
2910 * Connect to an inet socket. The DISPLAY value is supposedly
2911 * hostname:d[.s], where hostname may also be numeric IP address.
2912 */
Ben Lindstromccd8d072001-12-07 17:26:48 +00002913 strlcpy(buf, display, sizeof(buf));
Damien Miller95def091999-11-25 00:26:21 +11002914 cp = strchr(buf, ':');
2915 if (!cp) {
2916 error("Could not find ':' in DISPLAY: %.100s", display);
Damien Millerbd483e72000-04-30 10:00:53 +10002917 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002918 }
Damien Miller95def091999-11-25 00:26:21 +11002919 *cp = 0;
Damien Miller5428f641999-11-25 11:54:57 +11002920 /* buf now contains the host name. But first we parse the display number. */
Damien Miller95def091999-11-25 00:26:21 +11002921 if (sscanf(cp + 1, "%d", &display_number) != 1) {
2922 error("Could not parse display number from DISPLAY: %.100s",
Damien Miller9f0f5c62001-12-21 14:45:46 +11002923 display);
Damien Millerbd483e72000-04-30 10:00:53 +10002924 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002925 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002926
Damien Miller34132e52000-01-14 15:45:46 +11002927 /* Look up the host address */
2928 memset(&hints, 0, sizeof(hints));
2929 hints.ai_family = IPv4or6;
2930 hints.ai_socktype = SOCK_STREAM;
2931 snprintf(strport, sizeof strport, "%d", 6000 + display_number);
2932 if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) {
2933 error("%.100s: unknown host. (%s)", buf, gai_strerror(gaierr));
Damien Millerbd483e72000-04-30 10:00:53 +10002934 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002935 }
Damien Miller34132e52000-01-14 15:45:46 +11002936 for (ai = aitop; ai; ai = ai->ai_next) {
2937 /* Create a socket. */
Damien Miller2372ace2003-05-14 13:42:23 +10002938 sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
Damien Miller34132e52000-01-14 15:45:46 +11002939 if (sock < 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +10002940 debug2("socket: %.100s", strerror(errno));
Damien Millerb38eff82000-04-01 11:09:21 +10002941 continue;
2942 }
2943 /* Connect it to the display. */
2944 if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +10002945 debug2("connect %.100s port %d: %.100s", buf,
Damien Millerb38eff82000-04-01 11:09:21 +10002946 6000 + display_number, strerror(errno));
2947 close(sock);
2948 continue;
2949 }
2950 /* Success */
2951 break;
Damien Miller34132e52000-01-14 15:45:46 +11002952 }
Damien Miller34132e52000-01-14 15:45:46 +11002953 freeaddrinfo(aitop);
2954 if (!ai) {
Damien Miller4af51302000-04-16 11:18:38 +10002955 error("connect %.100s port %d: %.100s", buf, 6000 + display_number,
Damien Miller34132e52000-01-14 15:45:46 +11002956 strerror(errno));
Damien Millerbd483e72000-04-30 10:00:53 +10002957 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002958 }
Damien Miller398e1cf2002-02-05 11:52:13 +11002959 set_nodelay(sock);
Damien Millerbd483e72000-04-30 10:00:53 +10002960 return sock;
2961}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002962
Damien Millerbd483e72000-04-30 10:00:53 +10002963/*
2964 * This is called when SSH_SMSG_X11_OPEN is received. The packet contains
2965 * the remote channel number. We should do whatever we want, and respond
2966 * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE.
2967 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002968
Damien Millerbd483e72000-04-30 10:00:53 +10002969void
Damien Miller630d6f42002-01-22 23:17:30 +11002970x11_input_open(int type, u_int32_t seq, void *ctxt)
Damien Millerbd483e72000-04-30 10:00:53 +10002971{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002972 Channel *c = NULL;
2973 int remote_id, sock = 0;
Damien Millerbd483e72000-04-30 10:00:53 +10002974 char *remote_host;
Damien Millerbd483e72000-04-30 10:00:53 +10002975
2976 debug("Received X11 open request.");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002977
2978 remote_id = packet_get_int();
Ben Lindstrome9c99912001-06-09 00:41:05 +00002979
2980 if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002981 remote_host = packet_get_string(NULL);
2982 } else {
2983 remote_host = xstrdup("unknown (remote did not supply name)");
2984 }
Damien Miller48b03fc2002-01-22 23:11:40 +11002985 packet_check_eom();
Damien Millerbd483e72000-04-30 10:00:53 +10002986
2987 /* Obtain a connection to the real X display. */
2988 sock = x11_connect_display();
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002989 if (sock != -1) {
2990 /* Allocate a channel for this connection. */
2991 c = channel_new("connected x11 socket",
2992 SSH_CHANNEL_X11_OPEN, sock, sock, -1, 0, 0, 0,
2993 remote_host, 1);
Damien Miller699d0032002-02-08 22:07:16 +11002994 c->remote_id = remote_id;
2995 c->force_drain = 1;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002996 }
Damien Millerb1ca8bb2003-05-14 13:45:42 +10002997 xfree(remote_host);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002998 if (c == NULL) {
Damien Millerbd483e72000-04-30 10:00:53 +10002999 /* Send refusal to the remote host. */
3000 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003001 packet_put_int(remote_id);
Damien Millerbd483e72000-04-30 10:00:53 +10003002 } else {
Damien Millerbd483e72000-04-30 10:00:53 +10003003 /* Send a confirmation to the remote host. */
3004 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003005 packet_put_int(remote_id);
3006 packet_put_int(c->self);
Damien Millerbd483e72000-04-30 10:00:53 +10003007 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003008 packet_send();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003009}
3010
Damien Miller69b69aa2000-10-28 14:19:58 +11003011/* dummy protocol handler that denies SSH-1 requests (agent/x11) */
3012void
Damien Miller630d6f42002-01-22 23:17:30 +11003013deny_input_open(int type, u_int32_t seq, void *ctxt)
Damien Miller69b69aa2000-10-28 14:19:58 +11003014{
3015 int rchan = packet_get_int();
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +00003016
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00003017 switch (type) {
Damien Miller69b69aa2000-10-28 14:19:58 +11003018 case SSH_SMSG_AGENT_OPEN:
3019 error("Warning: ssh server tried agent forwarding.");
3020 break;
3021 case SSH_SMSG_X11_OPEN:
3022 error("Warning: ssh server tried X11 forwarding.");
3023 break;
3024 default:
Damien Miller630d6f42002-01-22 23:17:30 +11003025 error("deny_input_open: type %d", type);
Damien Miller69b69aa2000-10-28 14:19:58 +11003026 break;
3027 }
Damien Miller5eb137c2005-12-31 16:19:53 +11003028 error("Warning: this is probably a break-in attempt by a malicious server.");
Damien Miller69b69aa2000-10-28 14:19:58 +11003029 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
3030 packet_put_int(rchan);
3031 packet_send();
3032}
3033
Damien Miller5428f641999-11-25 11:54:57 +11003034/*
3035 * Requests forwarding of X11 connections, generates fake authentication
3036 * data, and enables authentication spoofing.
Ben Lindstrome9c99912001-06-09 00:41:05 +00003037 * This should be called in the client only.
Damien Miller5428f641999-11-25 11:54:57 +11003038 */
Damien Miller4af51302000-04-16 11:18:38 +10003039void
Damien Miller17e7ed02005-06-17 12:54:33 +10003040x11_request_forwarding_with_spoofing(int client_session_id, const char *disp,
Damien Millerbd483e72000-04-30 10:00:53 +10003041 const char *proto, const char *data)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003042{
Ben Lindstrom46c16222000-12-22 01:43:59 +00003043 u_int data_len = (u_int) strlen(data) / 2;
Damien Miller13390022005-07-06 09:44:19 +10003044 u_int i, value;
Damien Miller95def091999-11-25 00:26:21 +11003045 char *new_data;
3046 int screen_number;
3047 const char *cp;
Darren Tucker3f9fdc72004-06-22 12:56:01 +10003048 u_int32_t rnd = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003049
Damien Millerf92c0792005-07-06 09:45:26 +10003050 if (x11_saved_display == NULL)
3051 x11_saved_display = xstrdup(disp);
3052 else if (strcmp(disp, x11_saved_display) != 0) {
Damien Miller13390022005-07-06 09:44:19 +10003053 error("x11_request_forwarding_with_spoofing: different "
3054 "$DISPLAY already forwarded");
3055 return;
3056 }
3057
Damien Miller17e7ed02005-06-17 12:54:33 +10003058 cp = disp;
3059 if (disp)
3060 cp = strchr(disp, ':');
Damien Miller95def091999-11-25 00:26:21 +11003061 if (cp)
3062 cp = strchr(cp, '.');
3063 if (cp)
3064 screen_number = atoi(cp + 1);
3065 else
3066 screen_number = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003067
Damien Miller13390022005-07-06 09:44:19 +10003068 if (x11_saved_proto == NULL) {
3069 /* Save protocol name. */
3070 x11_saved_proto = xstrdup(proto);
3071 /*
Damien Miller46d38de2005-07-17 17:02:09 +10003072 * Extract real authentication data and generate fake data
Damien Miller13390022005-07-06 09:44:19 +10003073 * of the same length.
3074 */
3075 x11_saved_data = xmalloc(data_len);
3076 x11_fake_data = xmalloc(data_len);
3077 for (i = 0; i < data_len; i++) {
3078 if (sscanf(data + 2 * i, "%2x", &value) != 1)
3079 fatal("x11_request_forwarding: bad "
3080 "authentication data: %.100s", data);
3081 if (i % 4 == 0)
3082 rnd = arc4random();
3083 x11_saved_data[i] = value;
3084 x11_fake_data[i] = rnd & 0xff;
3085 rnd >>= 8;
3086 }
3087 x11_saved_data_len = data_len;
3088 x11_fake_data_len = data_len;
Damien Miller95def091999-11-25 00:26:21 +11003089 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003090
Damien Miller95def091999-11-25 00:26:21 +11003091 /* Convert the fake data into hex. */
Damien Miller13390022005-07-06 09:44:19 +10003092 new_data = tohex(x11_fake_data, data_len);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003093
Damien Miller95def091999-11-25 00:26:21 +11003094 /* Send the request packet. */
Damien Millerbd483e72000-04-30 10:00:53 +10003095 if (compat20) {
3096 channel_request_start(client_session_id, "x11-req", 0);
3097 packet_put_char(0); /* XXX bool single connection */
3098 } else {
3099 packet_start(SSH_CMSG_X11_REQUEST_FORWARDING);
3100 }
3101 packet_put_cstring(proto);
3102 packet_put_cstring(new_data);
Damien Miller95def091999-11-25 00:26:21 +11003103 packet_put_int(screen_number);
3104 packet_send();
3105 packet_write_wait();
3106 xfree(new_data);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003107}
3108
Ben Lindstrome9c99912001-06-09 00:41:05 +00003109
3110/* -- agent forwarding */
3111
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003112/* Sends a message to the server to request authentication fd forwarding. */
3113
Damien Miller4af51302000-04-16 11:18:38 +10003114void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00003115auth_request_forwarding(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003116{
Damien Miller95def091999-11-25 00:26:21 +11003117 packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING);
3118 packet_send();
3119 packet_write_wait();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003120}